From ce6ada35bdf710d16582cc4869c26722547e6f11 Mon Sep 17 00:00:00 2001 From: "Serge E. Hallyn" Date: Thu, 25 Nov 2010 17:11:32 +0000 Subject: security: Define CAP_SYSLOG Privileged syslog operations currently require CAP_SYS_ADMIN. Split this off into a new CAP_SYSLOG privilege which we can sanely take away from a container through the capability bounding set. With this patch, an lxc container can be prevented from messing with the host's syslog (i.e. dmesg -c). Changelog: mar 12 2010: add selinux capability2:cap_syslog perm Changelog: nov 22 2010: . port to new kernel . add a WARN_ONCE if userspace isn't using CAP_SYSLOG Signed-off-by: Serge Hallyn Acked-by: Andrew G. Morgan Acked-By: Kees Cook Cc: James Morris Cc: Michael Kerrisk Cc: Stephen Smalley Cc: "Christopher J. PeBenito" Cc: Eric Paris Signed-off-by: James Morris --- security/selinux/include/classmap.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'security') diff --git a/security/selinux/include/classmap.h b/security/selinux/include/classmap.h index 8858d2b2d4b6..7ed3663332ec 100644 --- a/security/selinux/include/classmap.h +++ b/security/selinux/include/classmap.h @@ -142,7 +142,7 @@ struct security_class_mapping secclass_map[] = { "node_bind", "name_connect", NULL } }, { "memprotect", { "mmap_zero", NULL } }, { "peer", { "recv", NULL } }, - { "capability2", { "mac_override", "mac_admin", NULL } }, + { "capability2", { "mac_override", "mac_admin", "syslog", NULL } }, { "kernel_service", { "use_as_override", "create_files_as", NULL } }, { "tun_socket", { COMMON_SOCK_PERMS, NULL } }, -- cgit v1.2.3 From d00a1c72f7f4661212299e6cb132dfa58030bcdb Mon Sep 17 00:00:00 2001 From: Mimi Zohar Date: Tue, 23 Nov 2010 17:50:34 -0500 Subject: keys: add new trusted key-type Define a new kernel key-type called 'trusted'. Trusted keys are random number symmetric keys, generated and RSA-sealed by the TPM. The TPM only unseals the keys, if the boot PCRs and other criteria match. Userspace can only ever see encrypted blobs. Based on suggestions by Jason Gunthorpe, several new options have been added to support additional usages. The new options are: migratable= designates that the key may/may not ever be updated (resealed under a new key, new pcrinfo or new auth.) pcrlock=n extends the designated PCR 'n' with a random value, so that a key sealed to that PCR may not be unsealed again until after a reboot. keyhandle= specifies the sealing/unsealing key handle. keyauth= specifies the sealing/unsealing key auth. blobauth= specifies the sealed data auth. Implementation of a kernel reserved locality for trusted keys will be investigated for a possible future extension. Changelog: - Updated and added examples to Documentation/keys-trusted-encrypted.txt - Moved generic TPM constants to include/linux/tpm_command.h (David Howell's suggestion.) - trusted_defined.c: replaced kzalloc with kmalloc, added pcrlock failure error handling, added const qualifiers where appropriate. - moved to late_initcall - updated from hash to shash (suggestion by David Howells) - reduced worst stack usage (tpm_seal) from 530 to 312 bytes - moved documentation to Documentation directory (suggestion by David Howells) - all the other code cleanups suggested by David Howells - Add pcrlock CAP_SYS_ADMIN dependency (based on comment by Jason Gunthorpe) - New options: migratable, pcrlock, keyhandle, keyauth, blobauth (based on discussions with Jason Gunthorpe) - Free payload on failure to create key(reported/fixed by Roberto Sassu) - Updated Kconfig and other descriptions (based on Serge Hallyn's suggestion) - Replaced kzalloc() with kmalloc() (reported by Serge Hallyn) Signed-off-by: David Safford Signed-off-by: Mimi Zohar Signed-off-by: James Morris --- Documentation/keys-trusted-encrypted.txt | 145 ++++ include/keys/trusted-type.h | 31 + include/linux/tpm_command.h | 28 + security/Kconfig | 15 + security/keys/Makefile | 1 + security/keys/trusted_defined.c | 1151 ++++++++++++++++++++++++++++++ security/keys/trusted_defined.h | 134 ++++ 7 files changed, 1505 insertions(+) create mode 100644 Documentation/keys-trusted-encrypted.txt create mode 100644 include/keys/trusted-type.h create mode 100644 include/linux/tpm_command.h create mode 100644 security/keys/trusted_defined.c create mode 100644 security/keys/trusted_defined.h (limited to 'security') diff --git a/Documentation/keys-trusted-encrypted.txt b/Documentation/keys-trusted-encrypted.txt new file mode 100644 index 000000000000..8fb79bc1ac4b --- /dev/null +++ b/Documentation/keys-trusted-encrypted.txt @@ -0,0 +1,145 @@ + Trusted and Encrypted Keys + +Trusted and Encrypted Keys are two new key types added to the existing kernel +key ring service. Both of these new types are variable length symmetic keys, +and in both cases all keys are created in the kernel, and user space sees, +stores, and loads only encrypted blobs. Trusted Keys require the availability +of a Trusted Platform Module (TPM) chip for greater security, while Encrypted +Keys can be used on any system. All user level blobs, are displayed and loaded +in hex ascii for convenience, and are integrity verified. + +Trusted Keys use a TPM both to generate and to seal the keys. Keys are sealed +under a 2048 bit RSA key in the TPM, and optionally sealed to specified PCR +(integrity measurement) values, and only unsealed by the TPM, if PCRs and blob +integrity verifications match. A loaded Trusted Key can be updated with new +(future) PCR values, so keys are easily migrated to new pcr values, such as +when the kernel and initramfs are updated. The same key can have many saved +blobs under different PCR values, so multiple boots are easily supported. + +By default, trusted keys are sealed under the SRK, which has the default +authorization value (20 zeros). This can be set at takeownership time with the +trouser's utility: "tpm_takeownership -u -z". + +Usage: + keyctl add trusted name "new keylen [options]" ring + keyctl add trusted name "load hex_blob [pcrlock=pcrnum]" ring + keyctl update key "update [options]" + keyctl print keyid + + options: + keyhandle= ascii hex value of sealing key default 0x40000000 (SRK) + keyauth= ascii hex auth for sealing key default 0x00...i + (40 ascii zeros) + blobauth= ascii hex auth for sealed data default 0x00... + (40 ascii zeros) + blobauth= ascii hex auth for sealed data default 0x00... + (40 ascii zeros) + pcrinfo= ascii hex of PCR_INFO or PCR_INFO_LONG (no default) + pcrlock= pcr number to be extended to "lock" blob + migratable= 0|1 indicating permission to reseal to new PCR values, + default 1 (resealing allowed) + +"keyctl print" returns an ascii hex copy of the sealed key, which is in standard +TPM_STORED_DATA format. The key length for new keys are always in bytes. +Trusted Keys can be 32 - 128 bytes (256 - 1024 bits), the upper limit is to fit +within the 2048 bit SRK (RSA) keylength, with all necessary structure/padding. + +Encrypted keys do not depend on a TPM, and are faster, as they use AES for +encryption/decryption. New keys are created from kernel generated random +numbers, and are encrypted/decrypted using a specified 'master' key. The +'master' key can either be a trusted-key or user-key type. The main +disadvantage of encrypted keys is that if they are not rooted in a trusted key, +they are only as secure as the user key encrypting them. The master user key +should therefore be loaded in as secure a way as possible, preferably early in +boot. + +Usage: + keyctl add encrypted name "new key-type:master-key-name keylen" ring + keyctl add encrypted name "load hex_blob" ring + keyctl update keyid "update key-type:master-key-name" + +where 'key-type' is either 'trusted' or 'user'. + +Examples of trusted and encrypted key usage: + +Create and save a trusted key named "kmk" of length 32 bytes: + + $ keyctl add trusted kmk "new 32" @u + 440502848 + + $ keyctl show + Session Keyring + -3 --alswrv 500 500 keyring: _ses + 97833714 --alswrv 500 -1 \_ keyring: _uid.500 + 440502848 --alswrv 500 500 \_ trusted: kmk + + $ keyctl print 440502848 + 0101000000000000000001005d01b7e3f4a6be5709930f3b70a743cbb42e0cc95e18e915 + 3f60da455bbf1144ad12e4f92b452f966929f6105fd29ca28e4d4d5a031d068478bacb0b + 27351119f822911b0a11ba3d3498ba6a32e50dac7f32894dd890eb9ad578e4e292c83722 + a52e56a097e6a68b3f56f7a52ece0cdccba1eb62cad7d817f6dc58898b3ac15f36026fec + d568bd4a706cb60bb37be6d8f1240661199d640b66fb0fe3b079f97f450b9ef9c22c6d5d + dd379f0facd1cd020281dfa3c70ba21a3fa6fc2471dc6d13ecf8298b946f65345faa5ef0 + f1f8fff03ad0acb083725535636addb08d73dedb9832da198081e5deae84bfaf0409c22b + e4a8aea2b607ec96931e6f4d4fe563ba + + $ keyctl pipe 440502848 > kmk.blob + +Load a trusted key from the saved blob: + + $ keyctl add trusted kmk "load `cat kmk.blob`" @u + 268728824 + + $ keyctl print 268728824 + 0101000000000000000001005d01b7e3f4a6be5709930f3b70a743cbb42e0cc95e18e915 + 3f60da455bbf1144ad12e4f92b452f966929f6105fd29ca28e4d4d5a031d068478bacb0b + 27351119f822911b0a11ba3d3498ba6a32e50dac7f32894dd890eb9ad578e4e292c83722 + a52e56a097e6a68b3f56f7a52ece0cdccba1eb62cad7d817f6dc58898b3ac15f36026fec + d568bd4a706cb60bb37be6d8f1240661199d640b66fb0fe3b079f97f450b9ef9c22c6d5d + dd379f0facd1cd020281dfa3c70ba21a3fa6fc2471dc6d13ecf8298b946f65345faa5ef0 + f1f8fff03ad0acb083725535636addb08d73dedb9832da198081e5deae84bfaf0409c22b + e4a8aea2b607ec96931e6f4d4fe563ba + +Reseal a trusted key under new pcr values: + + $ keyctl update 268728824 "update pcrinfo=`cat pcr.blob`" + $ keyctl print 268728824 + 010100000000002c0002800093c35a09b70fff26e7a98ae786c641e678ec6ffb6b46d805 + 77c8a6377aed9d3219c6dfec4b23ffe3000001005d37d472ac8a44023fbb3d18583a4f73 + d3a076c0858f6f1dcaa39ea0f119911ff03f5406df4f7f27f41da8d7194f45c9f4e00f2e + df449f266253aa3f52e55c53de147773e00f0f9aca86c64d94c95382265968c354c5eab4 + 9638c5ae99c89de1e0997242edfb0b501744e11ff9762dfd951cffd93227cc513384e7e6 + e782c29435c7ec2edafaa2f4c1fe6e7a781b59549ff5296371b42133777dcc5b8b971610 + 94bc67ede19e43ddb9dc2baacad374a36feaf0314d700af0a65c164b7082401740e489c9 + 7ef6a24defe4846104209bf0c3eced7fa1a672ed5b125fc9d8cd88b476a658a4434644ef + df8ae9a178e9f83ba9f08d10fa47e4226b98b0702f06b3b8 + +Create and save an encrypted key "evm" using the above trusted key "kmk": + + $ keyctl add encrypted evm "new trusted:kmk 32" @u + 159771175 + + $ keyctl print 159771175 + trusted:kmk 32 2375725ad57798846a9bbd240de8906f006e66c03af53b1b382dbbc55 + be2a44616e4959430436dc4f2a7a9659aa60bb4652aeb2120f149ed197c564e024717c64 + 5972dcb82ab2dde83376d82b2e3c09ffc + + $ keyctl pipe 159771175 > evm.blob + +Load an encrypted key "evm" from saved blob: + + $ keyctl add encrypted evm "load `cat evm.blob`" @u + 831684262 + + $ keyctl print 831684262 + trusted:kmk 32 2375725ad57798846a9bbd240de8906f006e66c03af53b1b382dbbc55 + be2a44616e4959430436dc4f2a7a9659aa60bb4652aeb2120f149ed197c564e024717c64 + 5972dcb82ab2dde83376d82b2e3c09ffc + + +The initial consumer of trusted keys is EVM, which at boot time needs a high +quality symmetric key for HMAC protection of file metadata. The use of a +trusted key provides strong guarantees that the EVM key has not been +compromised by a user level problem, and when sealed to specific boot PCR +values, protects against boot and offline attacks. Other uses for trusted and +encrypted keys, such as for disk and file encryption are anticipated. diff --git a/include/keys/trusted-type.h b/include/keys/trusted-type.h new file mode 100644 index 000000000000..56f82e5c9975 --- /dev/null +++ b/include/keys/trusted-type.h @@ -0,0 +1,31 @@ +/* + * Copyright (C) 2010 IBM Corporation + * Author: David Safford + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, version 2 of the License. + */ + +#ifndef _KEYS_TRUSTED_TYPE_H +#define _KEYS_TRUSTED_TYPE_H + +#include +#include + +#define MIN_KEY_SIZE 32 +#define MAX_KEY_SIZE 128 +#define MAX_BLOB_SIZE 320 + +struct trusted_key_payload { + struct rcu_head rcu; + unsigned int key_len; + unsigned int blob_len; + unsigned char migratable; + unsigned char key[MAX_KEY_SIZE + 1]; + unsigned char blob[MAX_BLOB_SIZE]; +}; + +extern struct key_type key_type_trusted; + +#endif /* _KEYS_TRUSTED_TYPE_H */ diff --git a/include/linux/tpm_command.h b/include/linux/tpm_command.h new file mode 100644 index 000000000000..727512e249b5 --- /dev/null +++ b/include/linux/tpm_command.h @@ -0,0 +1,28 @@ +#ifndef __LINUX_TPM_COMMAND_H__ +#define __LINUX_TPM_COMMAND_H__ + +/* + * TPM Command constants from specifications at + * http://www.trustedcomputinggroup.org + */ + +/* Command TAGS */ +#define TPM_TAG_RQU_COMMAND 193 +#define TPM_TAG_RQU_AUTH1_COMMAND 194 +#define TPM_TAG_RQU_AUTH2_COMMAND 195 +#define TPM_TAG_RSP_COMMAND 196 +#define TPM_TAG_RSP_AUTH1_COMMAND 197 +#define TPM_TAG_RSP_AUTH2_COMMAND 198 + +/* Command Ordinals */ +#define TPM_ORD_GETRANDOM 70 +#define TPM_ORD_OSAP 11 +#define TPM_ORD_OIAP 10 +#define TPM_ORD_SEAL 23 +#define TPM_ORD_UNSEAL 24 + +/* Other constants */ +#define SRKHANDLE 0x40000000 +#define TPM_NONCE_SIZE 20 + +#endif diff --git a/security/Kconfig b/security/Kconfig index e80da955e687..24b8f9b491b8 100644 --- a/security/Kconfig +++ b/security/Kconfig @@ -21,6 +21,21 @@ config KEYS If you are unsure as to whether this is required, answer N. +config TRUSTED_KEYS + tristate "TRUSTED KEYS" + depends on KEYS && TCG_TPM + select CRYPTO + select CRYPTO_HMAC + select CRYPTO_SHA1 + help + This option provides support for creating, sealing, and unsealing + keys in the kernel. Trusted keys are random number symmetric keys, + generated and RSA-sealed by the TPM. The TPM only unseals the keys, + if the boot PCRs and other criteria match. Userspace will only ever + see encrypted blobs. + + If you are unsure as to whether this is required, answer N. + config KEYS_DEBUG_PROC_KEYS bool "Enable the /proc/keys file by which keys may be viewed" depends on KEYS diff --git a/security/keys/Makefile b/security/keys/Makefile index 74d5447d7df7..fcb107020b4a 100644 --- a/security/keys/Makefile +++ b/security/keys/Makefile @@ -13,6 +13,7 @@ obj-y := \ request_key_auth.o \ user_defined.o +obj-$(CONFIG_TRUSTED_KEYS) += trusted_defined.o obj-$(CONFIG_KEYS_COMPAT) += compat.o obj-$(CONFIG_PROC_FS) += proc.o obj-$(CONFIG_SYSCTL) += sysctl.o diff --git a/security/keys/trusted_defined.c b/security/keys/trusted_defined.c new file mode 100644 index 000000000000..1bec72e7596d --- /dev/null +++ b/security/keys/trusted_defined.c @@ -0,0 +1,1151 @@ +/* + * Copyright (C) 2010 IBM Corporation + * + * Author: + * David Safford + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, version 2 of the License. + * + * See Documentation/keys-trusted-encrypted.txt + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "trusted_defined.h" + +static const char hmac_alg[] = "hmac(sha1)"; +static const char hash_alg[] = "sha1"; + +struct sdesc { + struct shash_desc shash; + char ctx[]; +}; + +static struct crypto_shash *hashalg; +static struct crypto_shash *hmacalg; + +static struct sdesc *init_sdesc(struct crypto_shash *alg) +{ + struct sdesc *sdesc; + int size; + + size = sizeof(struct shash_desc) + crypto_shash_descsize(alg); + sdesc = kmalloc(size, GFP_KERNEL); + if (!sdesc) + return ERR_PTR(-ENOMEM); + sdesc->shash.tfm = alg; + sdesc->shash.flags = 0x0; + return sdesc; +} + +static int TSS_sha1(const unsigned char *data, const unsigned int datalen, + unsigned char *digest) +{ + struct sdesc *sdesc; + int ret; + + sdesc = init_sdesc(hashalg); + if (IS_ERR(sdesc)) { + pr_info("trusted_key: can't alloc %s\n", hash_alg); + return PTR_ERR(sdesc); + } + + ret = crypto_shash_digest(&sdesc->shash, data, datalen, digest); + kfree(sdesc); + return ret; +} + +static int TSS_rawhmac(unsigned char *digest, const unsigned char *key, + const unsigned int keylen, ...) +{ + struct sdesc *sdesc; + va_list argp; + unsigned int dlen; + unsigned char *data; + int ret; + + sdesc = init_sdesc(hmacalg); + if (IS_ERR(sdesc)) { + pr_info("trusted_key: can't alloc %s\n", hmac_alg); + return PTR_ERR(sdesc); + } + + ret = crypto_shash_setkey(hmacalg, key, keylen); + if (ret < 0) + goto out; + ret = crypto_shash_init(&sdesc->shash); + if (ret < 0) + goto out; + + va_start(argp, keylen); + for (;;) { + dlen = va_arg(argp, unsigned int); + if (dlen == 0) + break; + data = va_arg(argp, unsigned char *); + if (data == NULL) + return -EINVAL; + ret = crypto_shash_update(&sdesc->shash, data, dlen); + if (ret < 0) + goto out; + } + va_end(argp); + ret = crypto_shash_final(&sdesc->shash, digest); +out: + kfree(sdesc); + return ret; +} + +/* + * calculate authorization info fields to send to TPM + */ +static uint32_t TSS_authhmac(unsigned char *digest, const unsigned char *key, + const unsigned int keylen, unsigned char *h1, + unsigned char *h2, unsigned char h3, ...) +{ + unsigned char paramdigest[SHA1_DIGEST_SIZE]; + struct sdesc *sdesc; + unsigned int dlen; + unsigned char *data; + unsigned char c; + int ret; + va_list argp; + + sdesc = init_sdesc(hashalg); + if (IS_ERR(sdesc)) { + pr_info("trusted_key: can't alloc %s\n", hash_alg); + return PTR_ERR(sdesc); + } + + c = h3; + ret = crypto_shash_init(&sdesc->shash); + if (ret < 0) + goto out; + va_start(argp, h3); + for (;;) { + dlen = va_arg(argp, unsigned int); + if (dlen == 0) + break; + data = va_arg(argp, unsigned char *); + ret = crypto_shash_update(&sdesc->shash, data, dlen); + if (ret < 0) + goto out; + } + va_end(argp); + ret = crypto_shash_final(&sdesc->shash, paramdigest); + if (!ret) + TSS_rawhmac(digest, key, keylen, SHA1_DIGEST_SIZE, + paramdigest, TPM_NONCE_SIZE, h1, + TPM_NONCE_SIZE, h2, 1, &c, 0, 0); +out: + kfree(sdesc); + return ret; +} + +/* + * verify the AUTH1_COMMAND (Seal) result from TPM + */ +static uint32_t TSS_checkhmac1(unsigned char *buffer, + const uint32_t command, + const unsigned char *ononce, + const unsigned char *key, + const unsigned int keylen, ...) +{ + uint32_t bufsize; + uint16_t tag; + uint32_t ordinal; + uint32_t result; + unsigned char *enonce; + unsigned char *continueflag; + unsigned char *authdata; + unsigned char testhmac[SHA1_DIGEST_SIZE]; + unsigned char paramdigest[SHA1_DIGEST_SIZE]; + struct sdesc *sdesc; + unsigned int dlen; + unsigned int dpos; + va_list argp; + int ret; + + bufsize = LOAD32(buffer, TPM_SIZE_OFFSET); + tag = LOAD16(buffer, 0); + ordinal = command; + result = LOAD32N(buffer, TPM_RETURN_OFFSET); + if (tag == TPM_TAG_RSP_COMMAND) + return 0; + if (tag != TPM_TAG_RSP_AUTH1_COMMAND) + return -EINVAL; + authdata = buffer + bufsize - SHA1_DIGEST_SIZE; + continueflag = authdata - 1; + enonce = continueflag - TPM_NONCE_SIZE; + + sdesc = init_sdesc(hashalg); + if (IS_ERR(sdesc)) { + pr_info("trusted_key: can't alloc %s\n", hash_alg); + return PTR_ERR(sdesc); + } + ret = crypto_shash_init(&sdesc->shash); + if (ret < 0) + goto out; + ret = crypto_shash_update(&sdesc->shash, (const u8 *)&result, + sizeof result); + if (ret < 0) + goto out; + ret = crypto_shash_update(&sdesc->shash, (const u8 *)&ordinal, + sizeof ordinal); + if (ret < 0) + goto out; + va_start(argp, keylen); + for (;;) { + dlen = va_arg(argp, unsigned int); + if (dlen == 0) + break; + dpos = va_arg(argp, unsigned int); + ret = crypto_shash_update(&sdesc->shash, buffer + dpos, dlen); + if (ret < 0) + goto out; + } + va_end(argp); + ret = crypto_shash_final(&sdesc->shash, paramdigest); + if (ret < 0) + goto out; + ret = TSS_rawhmac(testhmac, key, keylen, SHA1_DIGEST_SIZE, paramdigest, + TPM_NONCE_SIZE, enonce, TPM_NONCE_SIZE, ononce, + 1, continueflag, 0, 0); + if (ret < 0) + goto out; + if (memcmp(testhmac, authdata, SHA1_DIGEST_SIZE)) + ret = -EINVAL; +out: + kfree(sdesc); + return ret; +} + +/* + * verify the AUTH2_COMMAND (unseal) result from TPM + */ +static uint32_t TSS_checkhmac2(unsigned char *buffer, + const uint32_t command, + const unsigned char *ononce, + const unsigned char *key1, + const unsigned int keylen1, + const unsigned char *key2, + const unsigned int keylen2, ...) +{ + uint32_t bufsize; + uint16_t tag; + uint32_t ordinal; + uint32_t result; + unsigned char *enonce1; + unsigned char *continueflag1; + unsigned char *authdata1; + unsigned char *enonce2; + unsigned char *continueflag2; + unsigned char *authdata2; + unsigned char testhmac1[SHA1_DIGEST_SIZE]; + unsigned char testhmac2[SHA1_DIGEST_SIZE]; + unsigned char paramdigest[SHA1_DIGEST_SIZE]; + struct sdesc *sdesc; + unsigned int dlen; + unsigned int dpos; + va_list argp; + int ret; + + bufsize = LOAD32(buffer, TPM_SIZE_OFFSET); + tag = LOAD16(buffer, 0); + ordinal = command; + result = LOAD32N(buffer, TPM_RETURN_OFFSET); + + if (tag == TPM_TAG_RSP_COMMAND) + return 0; + if (tag != TPM_TAG_RSP_AUTH2_COMMAND) + return -EINVAL; + authdata1 = buffer + bufsize - (SHA1_DIGEST_SIZE + 1 + + SHA1_DIGEST_SIZE + SHA1_DIGEST_SIZE); + authdata2 = buffer + bufsize - (SHA1_DIGEST_SIZE); + continueflag1 = authdata1 - 1; + continueflag2 = authdata2 - 1; + enonce1 = continueflag1 - TPM_NONCE_SIZE; + enonce2 = continueflag2 - TPM_NONCE_SIZE; + + sdesc = init_sdesc(hashalg); + if (IS_ERR(sdesc)) { + pr_info("trusted_key: can't alloc %s\n", hash_alg); + return PTR_ERR(sdesc); + } + ret = crypto_shash_init(&sdesc->shash); + if (ret < 0) + goto out; + ret = crypto_shash_update(&sdesc->shash, (const u8 *)&result, + sizeof result); + if (ret < 0) + goto out; + ret = crypto_shash_update(&sdesc->shash, (const u8 *)&ordinal, + sizeof ordinal); + if (ret < 0) + goto out; + + va_start(argp, keylen2); + for (;;) { + dlen = va_arg(argp, unsigned int); + if (dlen == 0) + break; + dpos = va_arg(argp, unsigned int); + ret = crypto_shash_update(&sdesc->shash, buffer + dpos, dlen); + if (ret < 0) + goto out; + } + ret = crypto_shash_final(&sdesc->shash, paramdigest); + if (ret < 0) + goto out; + + ret = TSS_rawhmac(testhmac1, key1, keylen1, SHA1_DIGEST_SIZE, + paramdigest, TPM_NONCE_SIZE, enonce1, + TPM_NONCE_SIZE, ononce, 1, continueflag1, 0, 0); + if (memcmp(testhmac1, authdata1, SHA1_DIGEST_SIZE)) { + ret = -EINVAL; + goto out; + } + ret = TSS_rawhmac(testhmac2, key2, keylen2, SHA1_DIGEST_SIZE, + paramdigest, TPM_NONCE_SIZE, enonce2, + TPM_NONCE_SIZE, ononce, 1, continueflag2, 0, 0); + if (memcmp(testhmac2, authdata2, SHA1_DIGEST_SIZE)) + ret = -EINVAL; +out: + kfree(sdesc); + return ret; +} + +/* + * For key specific tpm requests, we will generate and send our + * own TPM command packets using the drivers send function. + */ +static int trusted_tpm_send(const u32 chip_num, unsigned char *cmd, + size_t buflen) +{ + int rc; + + dump_tpm_buf(cmd); + rc = tpm_send(chip_num, cmd, buflen); + dump_tpm_buf(cmd); + if (rc > 0) + /* Can't return positive return codes values to keyctl */ + rc = -EPERM; + return rc; +} + +/* + * get a random value from TPM + */ +static int tpm_get_random(struct tpm_buf *tb, unsigned char *buf, uint32_t len) +{ + int ret; + + INIT_BUF(tb); + store16(tb, TPM_TAG_RQU_COMMAND); + store32(tb, TPM_GETRANDOM_SIZE); + store32(tb, TPM_ORD_GETRANDOM); + store32(tb, len); + ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, sizeof tb->data); + memcpy(buf, tb->data + TPM_GETRANDOM_SIZE, len); + + return ret; +} + +static int my_get_random(unsigned char *buf, int len) +{ + struct tpm_buf *tb; + int ret; + + tb = kzalloc(sizeof *tb, GFP_KERNEL); + if (!tb) + return -ENOMEM; + ret = tpm_get_random(tb, buf, len); + + kfree(tb); + return ret; +} + +/* + * Lock a trusted key, by extending a selected PCR. + * + * Prevents a trusted key that is sealed to PCRs from being accessed. + * This uses the tpm driver's extend function. + */ +static int pcrlock(const int pcrnum) +{ + unsigned char hash[SHA1_DIGEST_SIZE]; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + my_get_random(hash, SHA1_DIGEST_SIZE); + return tpm_pcr_extend(TPM_ANY_NUM, pcrnum, hash) ? -EINVAL : 0; +} + +/* + * Create an object specific authorisation protocol (OSAP) session + */ +static int osap(struct tpm_buf *tb, struct osapsess *s, + const unsigned char *key, const uint16_t type, + const uint32_t handle) +{ + unsigned char enonce[TPM_NONCE_SIZE]; + unsigned char ononce[TPM_NONCE_SIZE]; + int ret; + + ret = tpm_get_random(tb, ononce, TPM_NONCE_SIZE); + if (ret < 0) + return ret; + + INIT_BUF(tb); + store16(tb, TPM_TAG_RQU_COMMAND); + store32(tb, TPM_OSAP_SIZE); + store32(tb, TPM_ORD_OSAP); + store16(tb, type); + store32(tb, handle); + storebytes(tb, ononce, TPM_NONCE_SIZE); + + ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, MAX_BUF_SIZE); + if (ret < 0) + return ret; + + s->handle = LOAD32(tb->data, TPM_DATA_OFFSET); + memcpy(s->enonce, &(tb->data[TPM_DATA_OFFSET + sizeof(uint32_t)]), + TPM_NONCE_SIZE); + memcpy(enonce, &(tb->data[TPM_DATA_OFFSET + sizeof(uint32_t) + + TPM_NONCE_SIZE]), TPM_NONCE_SIZE); + ret = TSS_rawhmac(s->secret, key, SHA1_DIGEST_SIZE, TPM_NONCE_SIZE, + enonce, TPM_NONCE_SIZE, ononce, 0, 0); + return ret; +} + +/* + * Create an object independent authorisation protocol (oiap) session + */ +static int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce) +{ + int ret; + + INIT_BUF(tb); + store16(tb, TPM_TAG_RQU_COMMAND); + store32(tb, TPM_OIAP_SIZE); + store32(tb, TPM_ORD_OIAP); + ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, MAX_BUF_SIZE); + if (ret < 0) + return ret; + + *handle = LOAD32(tb->data, TPM_DATA_OFFSET); + memcpy(nonce, &tb->data[TPM_DATA_OFFSET + sizeof(uint32_t)], + TPM_NONCE_SIZE); + return ret; +} + +struct tpm_digests { + unsigned char encauth[SHA1_DIGEST_SIZE]; + unsigned char pubauth[SHA1_DIGEST_SIZE]; + unsigned char xorwork[SHA1_DIGEST_SIZE * 2]; + unsigned char xorhash[SHA1_DIGEST_SIZE]; + unsigned char nonceodd[TPM_NONCE_SIZE]; +}; + +/* + * Have the TPM seal(encrypt) the trusted key, possibly based on + * Platform Configuration Registers (PCRs). AUTH1 for sealing key. + */ +static int tpm_seal(struct tpm_buf *tb, const uint16_t keytype, + const uint32_t keyhandle, const unsigned char *keyauth, + const unsigned char *data, const uint32_t datalen, + unsigned char *blob, uint32_t *bloblen, + const unsigned char *blobauth, + const unsigned char *pcrinfo, const uint32_t pcrinfosize) +{ + struct osapsess sess; + struct tpm_digests *td; + unsigned char cont; + uint32_t ordinal; + uint32_t pcrsize; + uint32_t datsize; + int sealinfosize; + int encdatasize; + int storedsize; + int ret; + int i; + + /* alloc some work space for all the hashes */ + td = kmalloc(sizeof *td, GFP_KERNEL); + if (!td) + return -ENOMEM; + + /* get session for sealing key */ + ret = osap(tb, &sess, keyauth, keytype, keyhandle); + if (ret < 0) + return ret; + dump_sess(&sess); + + /* calculate encrypted authorization value */ + memcpy(td->xorwork, sess.secret, SHA1_DIGEST_SIZE); + memcpy(td->xorwork + SHA1_DIGEST_SIZE, sess.enonce, SHA1_DIGEST_SIZE); + ret = TSS_sha1(td->xorwork, SHA1_DIGEST_SIZE * 2, td->xorhash); + if (ret < 0) + return ret; + + ret = tpm_get_random(tb, td->nonceodd, TPM_NONCE_SIZE); + if (ret < 0) + return ret; + ordinal = htonl(TPM_ORD_SEAL); + datsize = htonl(datalen); + pcrsize = htonl(pcrinfosize); + cont = 0; + + /* encrypt data authorization key */ + for (i = 0; i < SHA1_DIGEST_SIZE; ++i) + td->encauth[i] = td->xorhash[i] ^ blobauth[i]; + + /* calculate authorization HMAC value */ + if (pcrinfosize == 0) { + /* no pcr info specified */ + TSS_authhmac(td->pubauth, sess.secret, SHA1_DIGEST_SIZE, + sess.enonce, td->nonceodd, cont, sizeof(uint32_t), + &ordinal, SHA1_DIGEST_SIZE, td->encauth, + sizeof(uint32_t), &pcrsize, sizeof(uint32_t), + &datsize, datalen, data, 0, 0); + } else { + /* pcr info specified */ + TSS_authhmac(td->pubauth, sess.secret, SHA1_DIGEST_SIZE, + sess.enonce, td->nonceodd, cont, sizeof(uint32_t), + &ordinal, SHA1_DIGEST_SIZE, td->encauth, + sizeof(uint32_t), &pcrsize, pcrinfosize, + pcrinfo, sizeof(uint32_t), &datsize, datalen, + data, 0, 0); + } + + /* build and send the TPM request packet */ + INIT_BUF(tb); + store16(tb, TPM_TAG_RQU_AUTH1_COMMAND); + store32(tb, TPM_SEAL_SIZE + pcrinfosize + datalen); + store32(tb, TPM_ORD_SEAL); + store32(tb, keyhandle); + storebytes(tb, td->encauth, SHA1_DIGEST_SIZE); + store32(tb, pcrinfosize); + storebytes(tb, pcrinfo, pcrinfosize); + store32(tb, datalen); + storebytes(tb, data, datalen); + store32(tb, sess.handle); + storebytes(tb, td->nonceodd, TPM_NONCE_SIZE); + store8(tb, cont); + storebytes(tb, td->pubauth, SHA1_DIGEST_SIZE); + + ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, MAX_BUF_SIZE); + if (ret < 0) + return ret; + + /* calculate the size of the returned Blob */ + sealinfosize = LOAD32(tb->data, TPM_DATA_OFFSET + sizeof(uint32_t)); + encdatasize = LOAD32(tb->data, TPM_DATA_OFFSET + sizeof(uint32_t) + + sizeof(uint32_t) + sealinfosize); + storedsize = sizeof(uint32_t) + sizeof(uint32_t) + sealinfosize + + sizeof(uint32_t) + encdatasize; + + /* check the HMAC in the response */ + ret = TSS_checkhmac1(tb->data, ordinal, td->nonceodd, sess.secret, + SHA1_DIGEST_SIZE, storedsize, TPM_DATA_OFFSET, 0, + 0); + + /* copy the returned blob to caller */ + memcpy(blob, tb->data + TPM_DATA_OFFSET, storedsize); + *bloblen = storedsize; + return ret; +} + +/* + * use the AUTH2_COMMAND form of unseal, to authorize both key and blob + */ +static int tpm_unseal(struct tpm_buf *tb, + const uint32_t keyhandle, const unsigned char *keyauth, + const unsigned char *blob, const int bloblen, + const unsigned char *blobauth, + unsigned char *data, unsigned int *datalen) +{ + unsigned char nonceodd[TPM_NONCE_SIZE]; + unsigned char enonce1[TPM_NONCE_SIZE]; + unsigned char enonce2[TPM_NONCE_SIZE]; + unsigned char authdata1[SHA1_DIGEST_SIZE]; + unsigned char authdata2[SHA1_DIGEST_SIZE]; + uint32_t authhandle1 = 0; + uint32_t authhandle2 = 0; + unsigned char cont = 0; + uint32_t ordinal; + uint32_t keyhndl; + int ret; + + /* sessions for unsealing key and data */ + ret = oiap(tb, &authhandle1, enonce1); + if (ret < 0) { + pr_info("trusted_key: oiap failed (%d)\n", ret); + return ret; + } + ret = oiap(tb, &authhandle2, enonce2); + if (ret < 0) { + pr_info("trusted_key: oiap failed (%d)\n", ret); + return ret; + } + + ordinal = htonl(TPM_ORD_UNSEAL); + keyhndl = htonl(SRKHANDLE); + ret = tpm_get_random(tb, nonceodd, TPM_NONCE_SIZE); + if (ret < 0) { + pr_info("trusted_key: tpm_get_random failed (%d)\n", ret); + return ret; + } + TSS_authhmac(authdata1, keyauth, TPM_NONCE_SIZE, + enonce1, nonceodd, cont, sizeof(uint32_t), + &ordinal, bloblen, blob, 0, 0); + TSS_authhmac(authdata2, blobauth, TPM_NONCE_SIZE, + enonce2, nonceodd, cont, sizeof(uint32_t), + &ordinal, bloblen, blob, 0, 0); + + /* build and send TPM request packet */ + INIT_BUF(tb); + store16(tb, TPM_TAG_RQU_AUTH2_COMMAND); + store32(tb, TPM_UNSEAL_SIZE + bloblen); + store32(tb, TPM_ORD_UNSEAL); + store32(tb, keyhandle); + storebytes(tb, blob, bloblen); + store32(tb, authhandle1); + storebytes(tb, nonceodd, TPM_NONCE_SIZE); + store8(tb, cont); + storebytes(tb, authdata1, SHA1_DIGEST_SIZE); + store32(tb, authhandle2); + storebytes(tb, nonceodd, TPM_NONCE_SIZE); + store8(tb, cont); + storebytes(tb, authdata2, SHA1_DIGEST_SIZE); + + ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, MAX_BUF_SIZE); + if (ret < 0) { + pr_info("trusted_key: authhmac failed (%d)\n", ret); + return ret; + } + + *datalen = LOAD32(tb->data, TPM_DATA_OFFSET); + ret = TSS_checkhmac2(tb->data, ordinal, nonceodd, + keyauth, SHA1_DIGEST_SIZE, + blobauth, SHA1_DIGEST_SIZE, + sizeof(uint32_t), TPM_DATA_OFFSET, + *datalen, TPM_DATA_OFFSET + sizeof(uint32_t), 0, + 0); + if (ret < 0) + pr_info("trusted_key: TSS_checkhmac2 failed (%d)\n", ret); + memcpy(data, tb->data + TPM_DATA_OFFSET + sizeof(uint32_t), *datalen); + return ret; +} + +/* + * Have the TPM seal(encrypt) the symmetric key + */ +static int key_seal(struct trusted_key_payload *p, + struct trusted_key_options *o) +{ + struct tpm_buf *tb; + int ret; + + tb = kzalloc(sizeof *tb, GFP_KERNEL); + if (!tb) + return -ENOMEM; + + /* include migratable flag at end of sealed key */ + p->key[p->key_len] = p->migratable; + + ret = tpm_seal(tb, o->keytype, o->keyhandle, o->keyauth, + p->key, p->key_len + 1, p->blob, &p->blob_len, + o->blobauth, o->pcrinfo, o->pcrinfo_len); + if (ret < 0) + pr_info("trusted_key: srkseal failed (%d)\n", ret); + + kfree(tb); + return ret; +} + +/* + * Have the TPM unseal(decrypt) the symmetric key + */ +static int key_unseal(struct trusted_key_payload *p, + struct trusted_key_options *o) +{ + struct tpm_buf *tb; + int ret; + + tb = kzalloc(sizeof *tb, GFP_KERNEL); + if (!tb) + return -ENOMEM; + + ret = tpm_unseal(tb, o->keyhandle, o->keyauth, p->blob, p->blob_len, + o->blobauth, p->key, &p->key_len); + /* pull migratable flag out of sealed key */ + p->migratable = p->key[--p->key_len]; + + if (ret < 0) + pr_info("trusted_key: srkunseal failed (%d)\n", ret); + + kfree(tb); + return ret; +} + +enum { + Opt_err = -1, + Opt_new, Opt_load, Opt_update, + Opt_keyhandle, Opt_keyauth, Opt_blobauth, + Opt_pcrinfo, Opt_pcrlock, Opt_migratable +}; + +static const match_table_t key_tokens = { + {Opt_new, "new"}, + {Opt_load, "load"}, + {Opt_update, "update"}, + {Opt_keyhandle, "keyhandle=%s"}, + {Opt_keyauth, "keyauth=%s"}, + {Opt_blobauth, "blobauth=%s"}, + {Opt_pcrinfo, "pcrinfo=%s"}, + {Opt_pcrlock, "pcrlock=%s"}, + {Opt_migratable, "migratable=%s"}, + {Opt_err, NULL} +}; + +/* can have zero or more token= options */ +static int getoptions(char *c, struct trusted_key_payload *pay, + struct trusted_key_options *opt) +{ + substring_t args[MAX_OPT_ARGS]; + char *p = c; + int token; + int res; + unsigned long handle; + unsigned long lock; + + while ((p = strsep(&c, " \t"))) { + if (*p == '\0' || *p == ' ' || *p == '\t') + continue; + token = match_token(p, key_tokens, args); + + switch (token) { + case Opt_pcrinfo: + opt->pcrinfo_len = strlen(args[0].from) / 2; + if (opt->pcrinfo_len > MAX_PCRINFO_SIZE) + return -EINVAL; + hex2bin(opt->pcrinfo, args[0].from, opt->pcrinfo_len); + break; + case Opt_keyhandle: + res = strict_strtoul(args[0].from, 16, &handle); + if (res < 0) + return -EINVAL; + opt->keytype = SEAL_keytype; + opt->keyhandle = handle; + break; + case Opt_keyauth: + if (strlen(args[0].from) != 2 * SHA1_DIGEST_SIZE) + return -EINVAL; + hex2bin(opt->keyauth, args[0].from, SHA1_DIGEST_SIZE); + break; + case Opt_blobauth: + if (strlen(args[0].from) != 2 * SHA1_DIGEST_SIZE) + return -EINVAL; + hex2bin(opt->blobauth, args[0].from, SHA1_DIGEST_SIZE); + break; + case Opt_migratable: + if (*args[0].from == '0') + pay->migratable = 0; + else + return -EINVAL; + break; + case Opt_pcrlock: + res = strict_strtoul(args[0].from, 10, &lock); + if (res < 0) + return -EINVAL; + opt->pcrlock = lock; + break; + default: + return -EINVAL; + } + } + return 0; +} + +/* + * datablob_parse - parse the keyctl data and fill in the + * payload and options structures + * + * On success returns 0, otherwise -EINVAL. + */ +static int datablob_parse(char *datablob, struct trusted_key_payload *p, + struct trusted_key_options *o) +{ + substring_t args[MAX_OPT_ARGS]; + long keylen; + int ret = -EINVAL; + int key_cmd; + char *c; + + /* main command */ + c = strsep(&datablob, " \t"); + if (!c) + return -EINVAL; + key_cmd = match_token(c, key_tokens, args); + switch (key_cmd) { + case Opt_new: + /* first argument is key size */ + c = strsep(&datablob, " \t"); + if (!c) + return -EINVAL; + ret = strict_strtol(c, 10, &keylen); + if (ret < 0 || keylen < MIN_KEY_SIZE || keylen > MAX_KEY_SIZE) + return -EINVAL; + p->key_len = keylen; + ret = getoptions(datablob, p, o); + if (ret < 0) + return ret; + ret = Opt_new; + break; + case Opt_load: + /* first argument is sealed blob */ + c = strsep(&datablob, " \t"); + if (!c) + return -EINVAL; + p->blob_len = strlen(c) / 2; + if (p->blob_len > MAX_BLOB_SIZE) + return -EINVAL; + hex2bin(p->blob, c, p->blob_len); + ret = getoptions(datablob, p, o); + if (ret < 0) + return ret; + ret = Opt_load; + break; + case Opt_update: + /* all arguments are options */ + ret = getoptions(datablob, p, o); + if (ret < 0) + return ret; + ret = Opt_update; + break; + case Opt_err: + return -EINVAL; + break; + } + return ret; +} + +static struct trusted_key_options *trusted_options_alloc(void) +{ + struct trusted_key_options *options; + + options = kzalloc(sizeof *options, GFP_KERNEL); + if (!options) + return options; + + /* set any non-zero defaults */ + options->keytype = SRK_keytype; + options->keyhandle = SRKHANDLE; + return options; +} + +static struct trusted_key_payload *trusted_payload_alloc(struct key *key) +{ + struct trusted_key_payload *p = NULL; + int ret; + + ret = key_payload_reserve(key, sizeof *p); + if (ret < 0) + return p; + p = kzalloc(sizeof *p, GFP_KERNEL); + + /* migratable by default */ + p->migratable = 1; + return p; +} + +/* + * trusted_instantiate - create a new trusted key + * + * Unseal an existing trusted blob or, for a new key, get a + * random key, then seal and create a trusted key-type key, + * adding it to the specified keyring. + * + * On success, return 0. Otherwise return errno. + */ +static int trusted_instantiate(struct key *key, const void *data, + const size_t datalen) +{ + struct trusted_key_payload *payload = NULL; + struct trusted_key_options *options = NULL; + char *datablob; + int ret = 0; + int key_cmd; + + if (datalen <= 0 || datalen > 32767 || !data) + return -EINVAL; + + datablob = kmalloc(datalen + 1, GFP_KERNEL); + if (!datablob) + return -ENOMEM; + memcpy(datablob, data, datalen); + datablob[datalen] = '\0'; + + options = trusted_options_alloc(); + if (!options) { + ret = -ENOMEM; + goto out; + } + payload = trusted_payload_alloc(key); + if (!payload) { + ret = -ENOMEM; + goto out; + } + + key_cmd = datablob_parse(datablob, payload, options); + if (key_cmd < 0) { + ret = key_cmd; + goto out; + } + + dump_payload(payload); + dump_options(options); + + switch (key_cmd) { + case Opt_load: + ret = key_unseal(payload, options); + dump_payload(payload); + dump_options(options); + if (ret < 0) + pr_info("trusted_key: key_unseal failed (%d)\n", ret); + break; + case Opt_new: + ret = my_get_random(payload->key, payload->key_len); + if (ret < 0) { + pr_info("trusted_key: key_create failed (%d)\n", ret); + goto out; + } + ret = key_seal(payload, options); + if (ret < 0) + pr_info("trusted_key: key_seal failed (%d)\n", ret); + break; + default: + ret = -EINVAL; + goto out; + } + if (!ret && options->pcrlock) + ret = pcrlock(options->pcrlock); +out: + kfree(datablob); + kfree(options); + if (!ret) + rcu_assign_pointer(key->payload.data, payload); + else + kfree(payload); + return ret; +} + +static void trusted_rcu_free(struct rcu_head *rcu) +{ + struct trusted_key_payload *p; + + p = container_of(rcu, struct trusted_key_payload, rcu); + memset(p->key, 0, p->key_len); + kfree(p); +} + +/* + * trusted_update - reseal an existing key with new PCR values + */ +static int trusted_update(struct key *key, const void *data, + const size_t datalen) +{ + struct trusted_key_payload *p = key->payload.data; + struct trusted_key_payload *new_p; + struct trusted_key_options *new_o; + char *datablob; + int ret = 0; + + if (!p->migratable) + return -EPERM; + if (datalen <= 0 || datalen > 32767 || !data) + return -EINVAL; + + datablob = kmalloc(datalen + 1, GFP_KERNEL); + if (!datablob) + return -ENOMEM; + new_o = trusted_options_alloc(); + if (!new_o) { + ret = -ENOMEM; + goto out; + } + new_p = trusted_payload_alloc(key); + if (!new_p) { + ret = -ENOMEM; + goto out; + } + + memcpy(datablob, data, datalen); + datablob[datalen] = '\0'; + ret = datablob_parse(datablob, new_p, new_o); + if (ret != Opt_update) { + ret = -EINVAL; + goto out; + } + /* copy old key values, and reseal with new pcrs */ + new_p->migratable = p->migratable; + new_p->key_len = p->key_len; + memcpy(new_p->key, p->key, p->key_len); + dump_payload(p); + dump_payload(new_p); + + ret = key_seal(new_p, new_o); + if (ret < 0) { + pr_info("trusted_key: key_seal failed (%d)\n", ret); + kfree(new_p); + goto out; + } + if (new_o->pcrlock) { + ret = pcrlock(new_o->pcrlock); + if (ret < 0) { + pr_info("trusted_key: pcrlock failed (%d)\n", ret); + kfree(new_p); + goto out; + } + } + rcu_assign_pointer(key->payload.data, new_p); + call_rcu(&p->rcu, trusted_rcu_free); +out: + kfree(datablob); + kfree(new_o); + return ret; +} + +/* + * trusted_read - copy the sealed blob data to userspace in hex. + * On success, return to userspace the trusted key datablob size. + */ +static long trusted_read(const struct key *key, char __user *buffer, + size_t buflen) +{ + struct trusted_key_payload *p; + char *ascii_buf; + char *bufp; + int i; + + p = rcu_dereference_protected(key->payload.data, + rwsem_is_locked(&((struct key *)key)->sem)); + if (!p) + return -EINVAL; + if (!buffer || buflen <= 0) + return 2 * p->blob_len; + ascii_buf = kmalloc(2 * p->blob_len, GFP_KERNEL); + if (!ascii_buf) + return -ENOMEM; + + bufp = ascii_buf; + for (i = 0; i < p->blob_len; i++) + bufp = pack_hex_byte(bufp, p->blob[i]); + if ((copy_to_user(buffer, ascii_buf, 2 * p->blob_len)) != 0) { + kfree(ascii_buf); + return -EFAULT; + } + kfree(ascii_buf); + return 2 * p->blob_len; +} + +/* + * trusted_destroy - before freeing the key, clear the decrypted data + */ +static void trusted_destroy(struct key *key) +{ + struct trusted_key_payload *p = key->payload.data; + + if (!p) + return; + memset(p->key, 0, p->key_len); + kfree(key->payload.data); +} + +struct key_type key_type_trusted = { + .name = "trusted", + .instantiate = trusted_instantiate, + .update = trusted_update, + .match = user_match, + .destroy = trusted_destroy, + .describe = user_describe, + .read = trusted_read, +}; + +EXPORT_SYMBOL_GPL(key_type_trusted); + +static void trusted_shash_release(void) +{ + if (hashalg) + crypto_free_shash(hashalg); + if (hmacalg) + crypto_free_shash(hmacalg); +} + +static int __init trusted_shash_alloc(void) +{ + int ret; + + hmacalg = crypto_alloc_shash(hmac_alg, 0, CRYPTO_ALG_ASYNC); + if (IS_ERR(hmacalg)) { + pr_info("trusted_key: could not allocate crypto %s\n", + hmac_alg); + return PTR_ERR(hmacalg); + } + + hashalg = crypto_alloc_shash(hash_alg, 0, CRYPTO_ALG_ASYNC); + if (IS_ERR(hashalg)) { + pr_info("trusted_key: could not allocate crypto %s\n", + hash_alg); + ret = PTR_ERR(hashalg); + goto hashalg_fail; + } + + return 0; + +hashalg_fail: + crypto_free_shash(hmacalg); + return ret; +} + +static int __init init_trusted(void) +{ + int ret; + + ret = trusted_shash_alloc(); + if (ret < 0) + return ret; + ret = register_key_type(&key_type_trusted); + if (ret < 0) + trusted_shash_release(); + return ret; +} + +static void __exit cleanup_trusted(void) +{ + trusted_shash_release(); + unregister_key_type(&key_type_trusted); +} + +late_initcall(init_trusted); +module_exit(cleanup_trusted); + +MODULE_LICENSE("GPL"); diff --git a/security/keys/trusted_defined.h b/security/keys/trusted_defined.h new file mode 100644 index 000000000000..3249fbd2b653 --- /dev/null +++ b/security/keys/trusted_defined.h @@ -0,0 +1,134 @@ +#ifndef __TRUSTED_KEY_H +#define __TRUSTED_KEY_H + +/* implementation specific TPM constants */ +#define MAX_PCRINFO_SIZE 64 +#define MAX_BUF_SIZE 512 +#define TPM_GETRANDOM_SIZE 14 +#define TPM_OSAP_SIZE 36 +#define TPM_OIAP_SIZE 10 +#define TPM_SEAL_SIZE 87 +#define TPM_UNSEAL_SIZE 104 +#define TPM_SIZE_OFFSET 2 +#define TPM_RETURN_OFFSET 6 +#define TPM_DATA_OFFSET 10 + +#define LOAD32(buffer, offset) (ntohl(*(uint32_t *)&buffer[offset])) +#define LOAD32N(buffer, offset) (*(uint32_t *)&buffer[offset]) +#define LOAD16(buffer, offset) (ntohs(*(uint16_t *)&buffer[offset])) + +struct tpm_buf { + int len; + unsigned char data[MAX_BUF_SIZE]; +}; + +#define INIT_BUF(tb) (tb->len = 0) + +struct osapsess { + uint32_t handle; + unsigned char secret[SHA1_DIGEST_SIZE]; + unsigned char enonce[TPM_NONCE_SIZE]; +}; + +/* discrete values, but have to store in uint16_t for TPM use */ +enum { + SEAL_keytype = 1, + SRK_keytype = 4 +}; + +struct trusted_key_options { + uint16_t keytype; + uint32_t keyhandle; + unsigned char keyauth[SHA1_DIGEST_SIZE]; + unsigned char blobauth[SHA1_DIGEST_SIZE]; + uint32_t pcrinfo_len; + unsigned char pcrinfo[MAX_PCRINFO_SIZE]; + int pcrlock; +}; + +#define TPM_DEBUG 0 + +#if TPM_DEBUG +static inline void dump_options(struct trusted_key_options *o) +{ + pr_info("trusted_key: sealing key type %d\n", o->keytype); + pr_info("trusted_key: sealing key handle %0X\n", o->keyhandle); + pr_info("trusted_key: pcrlock %d\n", o->pcrlock); + pr_info("trusted_key: pcrinfo %d\n", o->pcrinfo_len); + print_hex_dump(KERN_INFO, "pcrinfo ", DUMP_PREFIX_NONE, + 16, 1, o->pcrinfo, o->pcrinfo_len, 0); +} + +static inline void dump_payload(struct trusted_key_payload *p) +{ + pr_info("trusted_key: key_len %d\n", p->key_len); + print_hex_dump(KERN_INFO, "key ", DUMP_PREFIX_NONE, + 16, 1, p->key, p->key_len, 0); + pr_info("trusted_key: bloblen %d\n", p->blob_len); + print_hex_dump(KERN_INFO, "blob ", DUMP_PREFIX_NONE, + 16, 1, p->blob, p->blob_len, 0); + pr_info("trusted_key: migratable %d\n", p->migratable); +} + +static inline void dump_sess(struct osapsess *s) +{ + print_hex_dump(KERN_INFO, "trusted-key: handle ", DUMP_PREFIX_NONE, + 16, 1, &s->handle, 4, 0); + pr_info("trusted-key: secret:\n"); + print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, + 16, 1, &s->secret, SHA1_DIGEST_SIZE, 0); + pr_info("trusted-key: enonce:\n"); + print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, + 16, 1, &s->enonce, SHA1_DIGEST_SIZE, 0); +} + +static inline void dump_tpm_buf(unsigned char *buf) +{ + int len; + + pr_info("\ntrusted-key: tpm buffer\n"); + len = LOAD32(buf, TPM_SIZE_OFFSET); + print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1, buf, len, 0); +} +#else +static inline void dump_options(struct trusted_key_options *o) +{ +} + +static inline void dump_payload(struct trusted_key_payload *p) +{ +} + +static inline void dump_sess(struct osapsess *s) +{ +} + +static inline void dump_tpm_buf(unsigned char *buf) +{ +} +#endif + +static inline void store8(struct tpm_buf *buf, const unsigned char value) +{ + buf->data[buf->len++] = value; +} + +static inline void store16(struct tpm_buf *buf, const uint16_t value) +{ + *(uint16_t *) & buf->data[buf->len] = htons(value); + buf->len += sizeof value; +} + +static inline void store32(struct tpm_buf *buf, const uint32_t value) +{ + *(uint32_t *) & buf->data[buf->len] = htonl(value); + buf->len += sizeof value; +} + +static inline void storebytes(struct tpm_buf *buf, const unsigned char *in, + const int len) +{ + memcpy(buf->data + buf->len, in, len); + buf->len += len; +} +#endif -- cgit v1.2.3 From 7e70cb4978507cf31d76b90e4cfb4c28cad87f0c Mon Sep 17 00:00:00 2001 From: Mimi Zohar Date: Tue, 23 Nov 2010 18:55:35 -0500 Subject: keys: add new key-type encrypted Define a new kernel key-type called 'encrypted'. Encrypted keys are kernel generated random numbers, which are encrypted/decrypted with a 'trusted' symmetric key. Encrypted keys are created/encrypted/decrypted in the kernel. Userspace only ever sees/stores encrypted blobs. Changelog: - bug fix: replaced master-key rcu based locking with semaphore (reported by David Howells) - Removed memset of crypto_shash_digest() digest output - Replaced verification of 'key-type:key-desc' using strcspn(), with one based on string constants. - Moved documentation to Documentation/keys-trusted-encrypted.txt - Replace hash with shash (based on comments by David Howells) - Make lengths/counts size_t where possible (based on comments by David Howells) Could not convert most lengths, as crypto expects 'unsigned int' (size_t: on 32 bit is defined as unsigned int, but on 64 bit is unsigned long) - Add 'const' where possible (based on comments by David Howells) - allocate derived_buf dynamically to support arbitrary length master key (fixed by Roberto Sassu) - wait until late_initcall for crypto libraries to be registered - cleanup security/Kconfig - Add missing 'update' keyword (reported/fixed by Roberto Sassu) - Free epayload on failure to create key (reported/fixed by Roberto Sassu) - Increase the data size limit (requested by Roberto Sassu) - Crypto return codes are always 0 on success and negative on failure, remove unnecessary tests. - Replaced kzalloc() with kmalloc() Signed-off-by: Mimi Zohar Signed-off-by: David Safford Reviewed-by: Roberto Sassu Signed-off-by: James Morris --- include/keys/encrypted-type.h | 29 ++ security/Kconfig | 16 + security/keys/Makefile | 1 + security/keys/encrypted_defined.c | 907 ++++++++++++++++++++++++++++++++++++++ security/keys/encrypted_defined.h | 56 +++ 5 files changed, 1009 insertions(+) create mode 100644 include/keys/encrypted-type.h create mode 100644 security/keys/encrypted_defined.c create mode 100644 security/keys/encrypted_defined.h (limited to 'security') diff --git a/include/keys/encrypted-type.h b/include/keys/encrypted-type.h new file mode 100644 index 000000000000..95855017a32b --- /dev/null +++ b/include/keys/encrypted-type.h @@ -0,0 +1,29 @@ +/* + * Copyright (C) 2010 IBM Corporation + * Author: Mimi Zohar + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, version 2 of the License. + */ + +#ifndef _KEYS_ENCRYPTED_TYPE_H +#define _KEYS_ENCRYPTED_TYPE_H + +#include +#include + +struct encrypted_key_payload { + struct rcu_head rcu; + char *master_desc; /* datablob: master key name */ + char *datalen; /* datablob: decrypted key length */ + u8 *iv; /* datablob: iv */ + u8 *encrypted_data; /* datablob: encrypted data */ + unsigned short datablob_len; /* length of datablob */ + unsigned short decrypted_datalen; /* decrypted data length */ + u8 decrypted_data[0]; /* decrypted data + datablob + hmac */ +}; + +extern struct key_type key_type_encrypted; + +#endif /* _KEYS_ENCRYPTED_TYPE_H */ diff --git a/security/Kconfig b/security/Kconfig index 24b8f9b491b8..95accd442d55 100644 --- a/security/Kconfig +++ b/security/Kconfig @@ -36,6 +36,22 @@ config TRUSTED_KEYS If you are unsure as to whether this is required, answer N. +config ENCRYPTED_KEYS + tristate "ENCRYPTED KEYS" + depends on KEYS && TRUSTED_KEYS + select CRYPTO_AES + select CRYPTO_CBC + select CRYPTO_SHA256 + select CRYPTO_RNG + help + This option provides support for create/encrypting/decrypting keys + in the kernel. Encrypted keys are kernel generated random numbers, + which are encrypted/decrypted with a 'master' symmetric key. The + 'master' key can be either a trusted-key or user-key type. + Userspace only ever sees/stores encrypted blobs. + + If you are unsure as to whether this is required, answer N. + config KEYS_DEBUG_PROC_KEYS bool "Enable the /proc/keys file by which keys may be viewed" depends on KEYS diff --git a/security/keys/Makefile b/security/keys/Makefile index fcb107020b4a..6c941050f573 100644 --- a/security/keys/Makefile +++ b/security/keys/Makefile @@ -14,6 +14,7 @@ obj-y := \ user_defined.o obj-$(CONFIG_TRUSTED_KEYS) += trusted_defined.o +obj-$(CONFIG_ENCRYPTED_KEYS) += encrypted_defined.o obj-$(CONFIG_KEYS_COMPAT) += compat.o obj-$(CONFIG_PROC_FS) += proc.o obj-$(CONFIG_SYSCTL) += sysctl.o diff --git a/security/keys/encrypted_defined.c b/security/keys/encrypted_defined.c new file mode 100644 index 000000000000..0e558dcad92f --- /dev/null +++ b/security/keys/encrypted_defined.c @@ -0,0 +1,907 @@ +/* + * Copyright (C) 2010 IBM Corporation + * + * Author: + * Mimi Zohar + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, version 2 of the License. + * + * See Documentation/keys-trusted-encrypted.txt + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "encrypted_defined.h" + +#define KEY_TRUSTED_PREFIX "trusted:" +#define KEY_TRUSTED_PREFIX_LEN (sizeof (KEY_TRUSTED_PREFIX) - 1) +#define KEY_USER_PREFIX "user:" +#define KEY_USER_PREFIX_LEN (sizeof (KEY_USER_PREFIX) - 1) + +#define HASH_SIZE SHA256_DIGEST_SIZE +#define MAX_DATA_SIZE 4096 +#define MIN_DATA_SIZE 20 + +static const char hash_alg[] = "sha256"; +static const char hmac_alg[] = "hmac(sha256)"; +static const char blkcipher_alg[] = "cbc(aes)"; +static unsigned int ivsize; +static int blksize; + +struct sdesc { + struct shash_desc shash; + char ctx[]; +}; + +static struct crypto_shash *hashalg; +static struct crypto_shash *hmacalg; + +enum { + Opt_err = -1, Opt_new, Opt_load, Opt_update +}; + +static const match_table_t key_tokens = { + {Opt_new, "new"}, + {Opt_load, "load"}, + {Opt_update, "update"}, + {Opt_err, NULL} +}; + +static int aes_get_sizes(void) +{ + struct crypto_blkcipher *tfm; + + tfm = crypto_alloc_blkcipher(blkcipher_alg, 0, CRYPTO_ALG_ASYNC); + if (IS_ERR(tfm)) { + pr_err("encrypted_key: failed to alloc_cipher (%ld)\n", + PTR_ERR(tfm)); + return PTR_ERR(tfm); + } + ivsize = crypto_blkcipher_ivsize(tfm); + blksize = crypto_blkcipher_blocksize(tfm); + crypto_free_blkcipher(tfm); + return 0; +} + +/* + * valid_master_desc - verify the 'key-type:desc' of a new/updated master-key + * + * key-type:= "trusted:" | "encrypted:" + * desc:= master-key description + * + * Verify that 'key-type' is valid and that 'desc' exists. On key update, + * only the master key description is permitted to change, not the key-type. + * The key-type remains constant. + * + * On success returns 0, otherwise -EINVAL. + */ +static int valid_master_desc(const char *new_desc, const char *orig_desc) +{ + if (!memcmp(new_desc, KEY_TRUSTED_PREFIX, KEY_TRUSTED_PREFIX_LEN)) { + if (strlen(new_desc) == KEY_TRUSTED_PREFIX_LEN) + goto out; + if (orig_desc) + if (memcmp(new_desc, orig_desc, KEY_TRUSTED_PREFIX_LEN)) + goto out; + } else if (!memcmp(new_desc, KEY_USER_PREFIX, KEY_USER_PREFIX_LEN)) { + if (strlen(new_desc) == KEY_USER_PREFIX_LEN) + goto out; + if (orig_desc) + if (memcmp(new_desc, orig_desc, KEY_USER_PREFIX_LEN)) + goto out; + } else + goto out; + return 0; +out: + return -EINVAL; +} + +/* + * datablob_parse - parse the keyctl data + * + * datablob format: + * new + * load + * update + * + * Tokenizes a copy of the keyctl data, returning a pointer to each token, + * which is null terminated. + * + * On success returns 0, otherwise -EINVAL. + */ +static int datablob_parse(char *datablob, char **master_desc, + char **decrypted_datalen, char **hex_encoded_iv, + char **hex_encoded_data) +{ + substring_t args[MAX_OPT_ARGS]; + int ret = -EINVAL; + int key_cmd; + char *p; + + p = strsep(&datablob, " \t"); + if (!p) + return ret; + key_cmd = match_token(p, key_tokens, args); + + *master_desc = strsep(&datablob, " \t"); + if (!*master_desc) + goto out; + + if (valid_master_desc(*master_desc, NULL) < 0) + goto out; + + if (decrypted_datalen) { + *decrypted_datalen = strsep(&datablob, " \t"); + if (!*decrypted_datalen) + goto out; + } + + switch (key_cmd) { + case Opt_new: + if (!decrypted_datalen) + break; + ret = 0; + break; + case Opt_load: + if (!decrypted_datalen) + break; + *hex_encoded_iv = strsep(&datablob, " \t"); + if (!*hex_encoded_iv) + break; + *hex_encoded_data = *hex_encoded_iv + (2 * ivsize) + 2; + ret = 0; + break; + case Opt_update: + if (decrypted_datalen) + break; + ret = 0; + break; + case Opt_err: + break; + } +out: + return ret; +} + +/* + * datablob_format - format as an ascii string, before copying to userspace + */ +static char *datablob_format(struct encrypted_key_payload *epayload, + size_t asciiblob_len) +{ + char *ascii_buf, *bufp; + u8 *iv = epayload->iv; + int len; + int i; + + ascii_buf = kmalloc(asciiblob_len + 1, GFP_KERNEL); + if (!ascii_buf) + goto out; + + ascii_buf[asciiblob_len] = '\0'; + + /* copy datablob master_desc and datalen strings */ + len = sprintf(ascii_buf, "%s %s ", epayload->master_desc, + epayload->datalen); + + /* convert the hex encoded iv, encrypted-data and HMAC to ascii */ + bufp = &ascii_buf[len]; + for (i = 0; i < (asciiblob_len - len) / 2; i++) + bufp = pack_hex_byte(bufp, iv[i]); +out: + return ascii_buf; +} + +/* + * request_trusted_key - request the trusted key + * + * Trusted keys are sealed to PCRs and other metadata. Although userspace + * manages both trusted/encrypted key-types, like the encrypted key type + * data, trusted key type data is not visible decrypted from userspace. + */ +static struct key *request_trusted_key(const char *trusted_desc, + u8 **master_key, + unsigned int *master_keylen) +{ + struct trusted_key_payload *tpayload; + struct key *tkey; + + tkey = request_key(&key_type_trusted, trusted_desc, NULL); + if (IS_ERR(tkey)) + goto error; + + down_read(&tkey->sem); + tpayload = rcu_dereference(tkey->payload.data); + *master_key = tpayload->key; + *master_keylen = tpayload->key_len; +error: + return tkey; +} + +/* + * request_user_key - request the user key + * + * Use a user provided key to encrypt/decrypt an encrypted-key. + */ +static struct key *request_user_key(const char *master_desc, u8 **master_key, + unsigned int *master_keylen) +{ + struct user_key_payload *upayload; + struct key *ukey; + + ukey = request_key(&key_type_user, master_desc, NULL); + if (IS_ERR(ukey)) + goto error; + + down_read(&ukey->sem); + upayload = rcu_dereference(ukey->payload.data); + *master_key = upayload->data; + *master_keylen = upayload->datalen; +error: + return ukey; +} + +static struct sdesc *init_sdesc(struct crypto_shash *alg) +{ + struct sdesc *sdesc; + int size; + + size = sizeof(struct shash_desc) + crypto_shash_descsize(alg); + sdesc = kmalloc(size, GFP_KERNEL); + if (!sdesc) + return ERR_PTR(-ENOMEM); + sdesc->shash.tfm = alg; + sdesc->shash.flags = 0x0; + return sdesc; +} + +static int calc_hmac(u8 *digest, const u8 *key, const unsigned int keylen, + const u8 *buf, const unsigned int buflen) +{ + struct sdesc *sdesc; + int ret; + + sdesc = init_sdesc(hmacalg); + if (IS_ERR(sdesc)) { + pr_info("encrypted_key: can't alloc %s\n", hmac_alg); + return PTR_ERR(sdesc); + } + + ret = crypto_shash_setkey(hmacalg, key, keylen); + if (!ret) + ret = crypto_shash_digest(&sdesc->shash, buf, buflen, digest); + kfree(sdesc); + return ret; +} + +static int calc_hash(u8 *digest, const u8 *buf, const unsigned int buflen) +{ + struct sdesc *sdesc; + int ret; + + sdesc = init_sdesc(hashalg); + if (IS_ERR(sdesc)) { + pr_info("encrypted_key: can't alloc %s\n", hash_alg); + return PTR_ERR(sdesc); + } + + ret = crypto_shash_digest(&sdesc->shash, buf, buflen, digest); + kfree(sdesc); + return ret; +} + +enum derived_key_type { ENC_KEY, AUTH_KEY }; + +/* Derive authentication/encryption key from trusted key */ +static int get_derived_key(u8 *derived_key, enum derived_key_type key_type, + const u8 *master_key, + const unsigned int master_keylen) +{ + u8 *derived_buf; + unsigned int derived_buf_len; + int ret; + + derived_buf_len = strlen("AUTH_KEY") + 1 + master_keylen; + if (derived_buf_len < HASH_SIZE) + derived_buf_len = HASH_SIZE; + + derived_buf = kzalloc(derived_buf_len, GFP_KERNEL); + if (!derived_buf) { + pr_err("encrypted_key: out of memory\n"); + return -ENOMEM; + } + if (key_type) + strcpy(derived_buf, "AUTH_KEY"); + else + strcpy(derived_buf, "ENC_KEY"); + + memcpy(derived_buf + strlen(derived_buf) + 1, master_key, + master_keylen); + ret = calc_hash(derived_key, derived_buf, derived_buf_len); + kfree(derived_buf); + return ret; +} + +static int init_blkcipher_desc(struct blkcipher_desc *desc, const u8 *key, + const unsigned int key_len, const u8 *iv, + const unsigned int ivsize) +{ + int ret; + + desc->tfm = crypto_alloc_blkcipher(blkcipher_alg, 0, CRYPTO_ALG_ASYNC); + if (IS_ERR(desc->tfm)) { + pr_err("encrypted_key: failed to load %s transform (%ld)\n", + blkcipher_alg, PTR_ERR(desc->tfm)); + return PTR_ERR(desc->tfm); + } + desc->flags = 0; + + ret = crypto_blkcipher_setkey(desc->tfm, key, key_len); + if (ret < 0) { + pr_err("encrypted_key: failed to setkey (%d)\n", ret); + crypto_free_blkcipher(desc->tfm); + return ret; + } + crypto_blkcipher_set_iv(desc->tfm, iv, ivsize); + return 0; +} + +static struct key *request_master_key(struct encrypted_key_payload *epayload, + u8 **master_key, + unsigned int *master_keylen) +{ + struct key *mkey = NULL; + + if (!strncmp(epayload->master_desc, KEY_TRUSTED_PREFIX, + KEY_TRUSTED_PREFIX_LEN)) { + mkey = request_trusted_key(epayload->master_desc + + KEY_TRUSTED_PREFIX_LEN, + master_key, master_keylen); + } else if (!strncmp(epayload->master_desc, KEY_USER_PREFIX, + KEY_USER_PREFIX_LEN)) { + mkey = request_user_key(epayload->master_desc + + KEY_USER_PREFIX_LEN, + master_key, master_keylen); + } else + goto out; + + if (IS_ERR(mkey)) + pr_info("encrypted_key: key %s not found", + epayload->master_desc); + if (mkey) + dump_master_key(*master_key, *master_keylen); +out: + return mkey; +} + +/* Before returning data to userspace, encrypt decrypted data. */ +static int derived_key_encrypt(struct encrypted_key_payload *epayload, + const u8 *derived_key, + const unsigned int derived_keylen) +{ + struct scatterlist sg_in[2]; + struct scatterlist sg_out[1]; + struct blkcipher_desc desc; + unsigned int encrypted_datalen; + unsigned int padlen; + char pad[16]; + int ret; + + encrypted_datalen = roundup(epayload->decrypted_datalen, blksize); + padlen = encrypted_datalen - epayload->decrypted_datalen; + + ret = init_blkcipher_desc(&desc, derived_key, derived_keylen, + epayload->iv, ivsize); + if (ret < 0) + goto out; + dump_decrypted_data(epayload); + + memset(pad, 0, sizeof pad); + sg_init_table(sg_in, 2); + sg_set_buf(&sg_in[0], epayload->decrypted_data, + epayload->decrypted_datalen); + sg_set_buf(&sg_in[1], pad, padlen); + + sg_init_table(sg_out, 1); + sg_set_buf(sg_out, epayload->encrypted_data, encrypted_datalen); + + ret = crypto_blkcipher_encrypt(&desc, sg_out, sg_in, encrypted_datalen); + crypto_free_blkcipher(desc.tfm); + if (ret < 0) + pr_err("encrypted_key: failed to encrypt (%d)\n", ret); + else + dump_encrypted_data(epayload, encrypted_datalen); +out: + return ret; +} + +static int datablob_hmac_append(struct encrypted_key_payload *epayload, + const u8 *master_key, + const unsigned int master_keylen) +{ + u8 derived_key[HASH_SIZE]; + u8 *digest; + int ret; + + ret = get_derived_key(derived_key, AUTH_KEY, master_key, master_keylen); + if (ret < 0) + goto out; + + digest = epayload->master_desc + epayload->datablob_len; + ret = calc_hmac(digest, derived_key, sizeof derived_key, + epayload->master_desc, epayload->datablob_len); + if (!ret) + dump_hmac(NULL, digest, HASH_SIZE); +out: + return ret; +} + +/* verify HMAC before decrypting encrypted key */ +static int datablob_hmac_verify(struct encrypted_key_payload *epayload, + const u8 *master_key, + const unsigned int master_keylen) +{ + u8 derived_key[HASH_SIZE]; + u8 digest[HASH_SIZE]; + int ret; + + ret = get_derived_key(derived_key, AUTH_KEY, master_key, master_keylen); + if (ret < 0) + goto out; + + ret = calc_hmac(digest, derived_key, sizeof derived_key, + epayload->master_desc, epayload->datablob_len); + if (ret < 0) + goto out; + ret = memcmp(digest, epayload->master_desc + epayload->datablob_len, + sizeof digest); + if (ret) { + ret = -EINVAL; + dump_hmac("datablob", + epayload->master_desc + epayload->datablob_len, + HASH_SIZE); + dump_hmac("calc", digest, HASH_SIZE); + } +out: + return ret; +} + +static int derived_key_decrypt(struct encrypted_key_payload *epayload, + const u8 *derived_key, + const unsigned int derived_keylen) +{ + struct scatterlist sg_in[1]; + struct scatterlist sg_out[2]; + struct blkcipher_desc desc; + unsigned int encrypted_datalen; + char pad[16]; + int ret; + + encrypted_datalen = roundup(epayload->decrypted_datalen, blksize); + ret = init_blkcipher_desc(&desc, derived_key, derived_keylen, + epayload->iv, ivsize); + if (ret < 0) + goto out; + dump_encrypted_data(epayload, encrypted_datalen); + + memset(pad, 0, sizeof pad); + sg_init_table(sg_in, 1); + sg_init_table(sg_out, 2); + sg_set_buf(sg_in, epayload->encrypted_data, encrypted_datalen); + sg_set_buf(&sg_out[0], epayload->decrypted_data, + (unsigned int)epayload->decrypted_datalen); + sg_set_buf(&sg_out[1], pad, sizeof pad); + + ret = crypto_blkcipher_decrypt(&desc, sg_out, sg_in, encrypted_datalen); + crypto_free_blkcipher(desc.tfm); + if (ret < 0) + goto out; + dump_decrypted_data(epayload); +out: + return ret; +} + +/* Allocate memory for decrypted key and datablob. */ +static struct encrypted_key_payload *encrypted_key_alloc(struct key *key, + const char *master_desc, + const char *datalen) +{ + struct encrypted_key_payload *epayload = NULL; + unsigned short datablob_len; + unsigned short decrypted_datalen; + unsigned int encrypted_datalen; + long dlen; + int ret; + + ret = strict_strtol(datalen, 10, &dlen); + if (ret < 0 || dlen < MIN_DATA_SIZE || dlen > MAX_DATA_SIZE) + return ERR_PTR(-EINVAL); + + decrypted_datalen = dlen; + encrypted_datalen = roundup(decrypted_datalen, blksize); + + datablob_len = strlen(master_desc) + 1 + strlen(datalen) + 1 + + ivsize + 1 + encrypted_datalen; + + ret = key_payload_reserve(key, decrypted_datalen + datablob_len + + HASH_SIZE + 1); + if (ret < 0) + return ERR_PTR(ret); + + epayload = kzalloc(sizeof(*epayload) + decrypted_datalen + + datablob_len + HASH_SIZE + 1, GFP_KERNEL); + if (!epayload) + return ERR_PTR(-ENOMEM); + + epayload->decrypted_datalen = decrypted_datalen; + epayload->datablob_len = datablob_len; + return epayload; +} + +static int encrypted_key_decrypt(struct encrypted_key_payload *epayload, + const char *hex_encoded_iv, + const char *hex_encoded_data) +{ + struct key *mkey; + u8 derived_key[HASH_SIZE]; + u8 *master_key; + u8 *hmac; + unsigned int master_keylen; + unsigned int encrypted_datalen; + int ret; + + encrypted_datalen = roundup(epayload->decrypted_datalen, blksize); + hex2bin(epayload->iv, hex_encoded_iv, ivsize); + hex2bin(epayload->encrypted_data, hex_encoded_data, encrypted_datalen); + + hmac = epayload->master_desc + epayload->datablob_len; + hex2bin(hmac, hex_encoded_data + (encrypted_datalen * 2), HASH_SIZE); + + mkey = request_master_key(epayload, &master_key, &master_keylen); + if (IS_ERR(mkey)) + return PTR_ERR(mkey); + + ret = datablob_hmac_verify(epayload, master_key, master_keylen); + if (ret < 0) { + pr_err("encrypted_key: bad hmac (%d)\n", ret); + goto out; + } + + ret = get_derived_key(derived_key, ENC_KEY, master_key, master_keylen); + if (ret < 0) + goto out; + + ret = derived_key_decrypt(epayload, derived_key, sizeof derived_key); + if (ret < 0) + pr_err("encrypted_key: failed to decrypt key (%d)\n", ret); +out: + up_read(&mkey->sem); + key_put(mkey); + return ret; +} + +static void __ekey_init(struct encrypted_key_payload *epayload, + const char *master_desc, const char *datalen) +{ + epayload->master_desc = epayload->decrypted_data + + epayload->decrypted_datalen; + epayload->datalen = epayload->master_desc + strlen(master_desc) + 1; + epayload->iv = epayload->datalen + strlen(datalen) + 1; + epayload->encrypted_data = epayload->iv + ivsize + 1; + + memcpy(epayload->master_desc, master_desc, strlen(master_desc)); + memcpy(epayload->datalen, datalen, strlen(datalen)); +} + +/* + * encrypted_init - initialize an encrypted key + * + * For a new key, use a random number for both the iv and data + * itself. For an old key, decrypt the hex encoded data. + */ +static int encrypted_init(struct encrypted_key_payload *epayload, + const char *master_desc, const char *datalen, + const char *hex_encoded_iv, + const char *hex_encoded_data) +{ + int ret = 0; + + __ekey_init(epayload, master_desc, datalen); + if (!hex_encoded_data) { + get_random_bytes(epayload->iv, ivsize); + + get_random_bytes(epayload->decrypted_data, + epayload->decrypted_datalen); + } else + ret = encrypted_key_decrypt(epayload, hex_encoded_iv, + hex_encoded_data); + return ret; +} + +/* + * encrypted_instantiate - instantiate an encrypted key + * + * Decrypt an existing encrypted datablob or create a new encrypted key + * based on a kernel random number. + * + * On success, return 0. Otherwise return errno. + */ +static int encrypted_instantiate(struct key *key, const void *data, + size_t datalen) +{ + struct encrypted_key_payload *epayload = NULL; + char *datablob = NULL; + char *master_desc = NULL; + char *decrypted_datalen = NULL; + char *hex_encoded_iv = NULL; + char *hex_encoded_data = NULL; + int ret; + + if (datalen <= 0 || datalen > 32767 || !data) + return -EINVAL; + + datablob = kmalloc(datalen + 1, GFP_KERNEL); + if (!datablob) + return -ENOMEM; + datablob[datalen] = 0; + memcpy(datablob, data, datalen); + ret = datablob_parse(datablob, &master_desc, &decrypted_datalen, + &hex_encoded_iv, &hex_encoded_data); + if (ret < 0) + goto out; + + epayload = encrypted_key_alloc(key, master_desc, decrypted_datalen); + if (IS_ERR(epayload)) { + ret = PTR_ERR(epayload); + goto out; + } + ret = encrypted_init(epayload, master_desc, decrypted_datalen, + hex_encoded_iv, hex_encoded_data); + if (ret < 0) { + kfree(epayload); + goto out; + } + + rcu_assign_pointer(key->payload.data, epayload); +out: + kfree(datablob); + return ret; +} + +static void encrypted_rcu_free(struct rcu_head *rcu) +{ + struct encrypted_key_payload *epayload; + + epayload = container_of(rcu, struct encrypted_key_payload, rcu); + memset(epayload->decrypted_data, 0, epayload->decrypted_datalen); + kfree(epayload); +} + +/* + * encrypted_update - update the master key description + * + * Change the master key description for an existing encrypted key. + * The next read will return an encrypted datablob using the new + * master key description. + * + * On success, return 0. Otherwise return errno. + */ +static int encrypted_update(struct key *key, const void *data, size_t datalen) +{ + struct encrypted_key_payload *epayload = key->payload.data; + struct encrypted_key_payload *new_epayload; + char *buf; + char *new_master_desc = NULL; + int ret = 0; + + if (datalen <= 0 || datalen > 32767 || !data) + return -EINVAL; + + buf = kmalloc(datalen + 1, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + buf[datalen] = 0; + memcpy(buf, data, datalen); + ret = datablob_parse(buf, &new_master_desc, NULL, NULL, NULL); + if (ret < 0) + goto out; + + ret = valid_master_desc(new_master_desc, epayload->master_desc); + if (ret < 0) + goto out; + + new_epayload = encrypted_key_alloc(key, new_master_desc, + epayload->datalen); + if (IS_ERR(new_epayload)) { + ret = PTR_ERR(new_epayload); + goto out; + } + + __ekey_init(new_epayload, new_master_desc, epayload->datalen); + + memcpy(new_epayload->iv, epayload->iv, ivsize); + memcpy(new_epayload->decrypted_data, epayload->decrypted_data, + epayload->decrypted_datalen); + + rcu_assign_pointer(key->payload.data, new_epayload); + call_rcu(&epayload->rcu, encrypted_rcu_free); +out: + kfree(buf); + return ret; +} + +/* + * encrypted_read - format and copy the encrypted data to userspace + * + * The resulting datablob format is: + * + * + * On success, return to userspace the encrypted key datablob size. + */ +static long encrypted_read(const struct key *key, char __user *buffer, + size_t buflen) +{ + struct encrypted_key_payload *epayload; + struct key *mkey; + u8 *master_key; + unsigned int master_keylen; + char derived_key[HASH_SIZE]; + char *ascii_buf; + size_t asciiblob_len; + int ret; + + epayload = rcu_dereference_protected(key->payload.data, + rwsem_is_locked(&((struct key *)key)->sem)); + + /* returns the hex encoded iv, encrypted-data, and hmac as ascii */ + asciiblob_len = epayload->datablob_len + ivsize + 1 + + roundup(epayload->decrypted_datalen, blksize) + + (HASH_SIZE * 2); + + if (!buffer || buflen < asciiblob_len) + return asciiblob_len; + + mkey = request_master_key(epayload, &master_key, &master_keylen); + if (IS_ERR(mkey)) + return PTR_ERR(mkey); + + ret = get_derived_key(derived_key, ENC_KEY, master_key, master_keylen); + if (ret < 0) + goto out; + + ret = derived_key_encrypt(epayload, derived_key, sizeof derived_key); + if (ret < 0) + goto out; + + ret = datablob_hmac_append(epayload, master_key, master_keylen); + if (ret < 0) + goto out; + + ascii_buf = datablob_format(epayload, asciiblob_len); + if (!ascii_buf) { + ret = -ENOMEM; + goto out; + } + + up_read(&mkey->sem); + key_put(mkey); + + if (copy_to_user(buffer, ascii_buf, asciiblob_len) != 0) + ret = -EFAULT; + kfree(ascii_buf); + + return asciiblob_len; +out: + up_read(&mkey->sem); + key_put(mkey); + return ret; +} + +/* + * encrypted_destroy - before freeing the key, clear the decrypted data + * + * Before freeing the key, clear the memory containing the decrypted + * key data. + */ +static void encrypted_destroy(struct key *key) +{ + struct encrypted_key_payload *epayload = key->payload.data; + + if (!epayload) + return; + + memset(epayload->decrypted_data, 0, epayload->decrypted_datalen); + kfree(key->payload.data); +} + +struct key_type key_type_encrypted = { + .name = "encrypted", + .instantiate = encrypted_instantiate, + .update = encrypted_update, + .match = user_match, + .destroy = encrypted_destroy, + .describe = user_describe, + .read = encrypted_read, +}; +EXPORT_SYMBOL_GPL(key_type_encrypted); + +static void encrypted_shash_release(void) +{ + if (hashalg) + crypto_free_shash(hashalg); + if (hmacalg) + crypto_free_shash(hmacalg); +} + +static int __init encrypted_shash_alloc(void) +{ + int ret; + + hmacalg = crypto_alloc_shash(hmac_alg, 0, CRYPTO_ALG_ASYNC); + if (IS_ERR(hmacalg)) { + pr_info("encrypted_key: could not allocate crypto %s\n", + hmac_alg); + return PTR_ERR(hmacalg); + } + + hashalg = crypto_alloc_shash(hash_alg, 0, CRYPTO_ALG_ASYNC); + if (IS_ERR(hashalg)) { + pr_info("encrypted_key: could not allocate crypto %s\n", + hash_alg); + ret = PTR_ERR(hashalg); + goto hashalg_fail; + } + + return 0; + +hashalg_fail: + crypto_free_shash(hmacalg); + return ret; +} + +static int __init init_encrypted(void) +{ + int ret; + + ret = encrypted_shash_alloc(); + if (ret < 0) + return ret; + ret = register_key_type(&key_type_encrypted); + if (ret < 0) + goto out; + return aes_get_sizes(); +out: + encrypted_shash_release(); + return ret; + +} + +static void __exit cleanup_encrypted(void) +{ + encrypted_shash_release(); + unregister_key_type(&key_type_encrypted); +} + +late_initcall(init_encrypted); +module_exit(cleanup_encrypted); + +MODULE_LICENSE("GPL"); diff --git a/security/keys/encrypted_defined.h b/security/keys/encrypted_defined.h new file mode 100644 index 000000000000..c298a3f1cf70 --- /dev/null +++ b/security/keys/encrypted_defined.h @@ -0,0 +1,56 @@ +#ifndef __ENCRYPTED_KEY_H +#define __ENCRYPTED_KEY_H + +#define ENCRYPTED_DEBUG 0 + +#if ENCRYPTED_DEBUG +static inline void dump_master_key(const u8 *master_key, + unsigned int master_keylen) +{ + print_hex_dump(KERN_ERR, "master key: ", DUMP_PREFIX_NONE, 32, 1, + master_key, master_keylen, 0); +} + +static inline void dump_decrypted_data(struct encrypted_key_payload *epayload) +{ + print_hex_dump(KERN_ERR, "decrypted data: ", DUMP_PREFIX_NONE, 32, 1, + epayload->decrypted_data, + epayload->decrypted_datalen, 0); +} + +static inline void dump_encrypted_data(struct encrypted_key_payload *epayload, + unsigned int encrypted_datalen) +{ + print_hex_dump(KERN_ERR, "encrypted data: ", DUMP_PREFIX_NONE, 32, 1, + epayload->encrypted_data, encrypted_datalen, 0); +} + +static inline void dump_hmac(const char *str, const u8 *digest, + unsigned int hmac_size) +{ + if (str) + pr_info("encrypted_key: %s", str); + print_hex_dump(KERN_ERR, "hmac: ", DUMP_PREFIX_NONE, 32, 1, digest, + hmac_size, 0); +} +#else +static inline void dump_master_key(const u8 *master_key, + unsigned int master_keylen) +{ +} + +static inline void dump_decrypted_data(struct encrypted_key_payload *epayload) +{ +} + +static inline void dump_encrypted_data(struct encrypted_key_payload *epayload, + unsigned int encrypted_datalen) +{ +} + +static inline void dump_hmac(const char *str, const u8 *digest, + unsigned int hmac_size) +{ +} +#endif +#endif -- cgit v1.2.3 From b4e0d5f0791bd6dd12a1c1edea0340969c7c1f90 Mon Sep 17 00:00:00 2001 From: Casey Schaufler Date: Wed, 24 Nov 2010 17:12:10 -0800 Subject: Smack: UDS revision This patch addresses a number of long standing issues with the way Smack treats UNIX domain sockets. All access control was being done based on the label of the file system object. This is inconsistant with the internet domain, in which access is done based on the IPIN and IPOUT attributes of the socket. As a result of the inode label policy it was not possible to use a UDS socket for label cognizant services, including dbus and the X11 server. Support for SCM_PEERSEC on UDS sockets is also provided. Signed-off-by: Casey Schaufler Signed-off-by: James Morris --- security/smack/smack_lsm.c | 106 +++++++++++++++++++++++++++------------------ 1 file changed, 63 insertions(+), 43 deletions(-) (limited to 'security') diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 489a85afa477..04a98c361a65 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -1667,10 +1667,13 @@ static int smack_inode_setsecurity(struct inode *inode, const char *name, ssp->smk_in = sp; else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { ssp->smk_out = sp; - rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); - if (rc != 0) - printk(KERN_WARNING "Smack: \"%s\" netlbl error %d.\n", - __func__, -rc); + if (sock->sk->sk_family != PF_UNIX) { + rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); + if (rc != 0) + printk(KERN_WARNING + "Smack: \"%s\" netlbl error %d.\n", + __func__, -rc); + } } else return -EOPNOTSUPP; @@ -2267,9 +2270,10 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) break; case SOCKFS_MAGIC: /* - * Casey says sockets get the smack of the task. + * Socket access is controlled by the socket + * structures associated with the task involved. */ - final = csp; + final = smack_known_star.smk_known; break; case PROC_SUPER_MAGIC: /* @@ -2296,7 +2300,16 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) /* * This isn't an understood special case. * Get the value from the xattr. - * + */ + + /* + * UNIX domain sockets use lower level socket data. + */ + if (S_ISSOCK(inode->i_mode)) { + final = smack_known_star.smk_known; + break; + } + /* * No xattr support means, alas, no SMACK label. * Use the aforeapplied default. * It would be curious if the label of the task @@ -2418,14 +2431,18 @@ static int smack_setprocattr(struct task_struct *p, char *name, static int smack_unix_stream_connect(struct socket *sock, struct socket *other, struct sock *newsk) { - struct inode *sp = SOCK_INODE(sock); - struct inode *op = SOCK_INODE(other); + struct socket_smack *ssp = sock->sk->sk_security; + struct socket_smack *osp = other->sk->sk_security; struct smk_audit_info ad; + int rc = 0; smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); smk_ad_setfield_u_net_sk(&ad, other->sk); - return smk_access(smk_of_inode(sp), smk_of_inode(op), - MAY_READWRITE, &ad); + + if (!capable(CAP_MAC_OVERRIDE)) + rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); + + return rc; } /** @@ -2438,13 +2455,18 @@ static int smack_unix_stream_connect(struct socket *sock, */ static int smack_unix_may_send(struct socket *sock, struct socket *other) { - struct inode *sp = SOCK_INODE(sock); - struct inode *op = SOCK_INODE(other); + struct socket_smack *ssp = sock->sk->sk_security; + struct socket_smack *osp = other->sk->sk_security; struct smk_audit_info ad; + int rc = 0; smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); smk_ad_setfield_u_net_sk(&ad, other->sk); - return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_WRITE, &ad); + + if (!capable(CAP_MAC_OVERRIDE)) + rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); + + return rc; } /** @@ -2629,7 +2651,7 @@ static int smack_socket_getpeersec_stream(struct socket *sock, /** * smack_socket_getpeersec_dgram - pull in packet label - * @sock: the socket + * @sock: the peer socket * @skb: packet data * @secid: pointer to where to put the secid of the packet * @@ -2640,41 +2662,39 @@ static int smack_socket_getpeersec_dgram(struct socket *sock, { struct netlbl_lsm_secattr secattr; - struct sock *sk; + struct socket_smack *sp; char smack[SMK_LABELLEN]; - int family = PF_INET; - u32 s; + int family = PF_UNSPEC; + u32 s = 0; /* 0 is the invalid secid */ int rc; - /* - * Only works for families with packets. - */ - if (sock != NULL) { - sk = sock->sk; - if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) - return 0; - family = sk->sk_family; + if (skb != NULL) { + if (skb->protocol == htons(ETH_P_IP)) + family = PF_INET; + else if (skb->protocol == htons(ETH_P_IPV6)) + family = PF_INET6; } - /* - * Translate what netlabel gave us. - */ - netlbl_secattr_init(&secattr); - rc = netlbl_skbuff_getattr(skb, family, &secattr); - if (rc == 0) - smack_from_secattr(&secattr, smack); - netlbl_secattr_destroy(&secattr); - - /* - * Give up if we couldn't get anything - */ - if (rc != 0) - return rc; + if (family == PF_UNSPEC && sock != NULL) + family = sock->sk->sk_family; - s = smack_to_secid(smack); + if (family == PF_UNIX) { + sp = sock->sk->sk_security; + s = smack_to_secid(sp->smk_out); + } else if (family == PF_INET || family == PF_INET6) { + /* + * Translate what netlabel gave us. + */ + netlbl_secattr_init(&secattr); + rc = netlbl_skbuff_getattr(skb, family, &secattr); + if (rc == 0) { + smack_from_secattr(&secattr, smack); + s = smack_to_secid(smack); + } + netlbl_secattr_destroy(&secattr); + } + *secid = s; if (s == 0) return -EINVAL; - - *secid = s; return 0; } -- cgit v1.2.3 From 93ae86e759299718c611bc543b9b1633bf32905a Mon Sep 17 00:00:00 2001 From: Mimi Zohar Date: Mon, 29 Nov 2010 16:20:04 -0500 Subject: keys: add missing include file for trusted and encrypted keys This patch fixes the linux-next powerpc build errors as reported by Stephen Rothwell. Reported-by: Stephen Rothwell Signed-off-by: Mimi Zohar Tested-by: Rajiv Andrade Signed-off-by: James Morris --- security/keys/encrypted_defined.c | 1 + security/keys/trusted_defined.c | 1 + 2 files changed, 2 insertions(+) (limited to 'security') diff --git a/security/keys/encrypted_defined.c b/security/keys/encrypted_defined.c index 0e558dcad92f..3f4085703e6c 100644 --- a/security/keys/encrypted_defined.c +++ b/security/keys/encrypted_defined.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include #include diff --git a/security/keys/trusted_defined.c b/security/keys/trusted_defined.c index 1bec72e7596d..aaaa069967a6 100644 --- a/security/keys/trusted_defined.c +++ b/security/keys/trusted_defined.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include #include -- cgit v1.2.3 From 9398c7f794078dc1768cc061b3da8cdd59f179a5 Mon Sep 17 00:00:00 2001 From: Eric Paris Date: Tue, 23 Nov 2010 11:40:08 -0500 Subject: SELinux: standardize return code handling in policydb.c policydb.c has lots of different standards on how to handle return paths on error. For the most part transition to rc=errno if (failure) goto out; [...] out: cleanup() return rc; Instead of doing cleanup mid function, or having multiple returns or other options. This doesn't do that for every function, but most of the complex functions which have cleanup routines on error. Signed-off-by: Eric Paris --- security/selinux/ss/policydb.c | 555 ++++++++++++++++++++--------------------- 1 file changed, 268 insertions(+), 287 deletions(-) (limited to 'security') diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c index 94f630d93a5c..6ad73e81da5c 100644 --- a/security/selinux/ss/policydb.c +++ b/security/selinux/ss/policydb.c @@ -148,32 +148,30 @@ static int roles_init(struct policydb *p) int rc; struct role_datum *role; + rc = -ENOMEM; role = kzalloc(sizeof(*role), GFP_KERNEL); - if (!role) { - rc = -ENOMEM; + if (!role) goto out; - } + + rc = -EINVAL; role->value = ++p->p_roles.nprim; - if (role->value != OBJECT_R_VAL) { - rc = -EINVAL; - goto out_free_role; - } + if (role->value != OBJECT_R_VAL) + goto out; + + rc = -ENOMEM; key = kstrdup(OBJECT_R, GFP_KERNEL); - if (!key) { - rc = -ENOMEM; - goto out_free_role; - } + if (!key) + goto out; + rc = hashtab_insert(p->p_roles.table, key, role); if (rc) - goto out_free_key; -out: - return rc; + goto out; -out_free_key: + return 0; +out: kfree(key); -out_free_role: kfree(role); - goto out; + return rc; } static u32 rangetr_hash(struct hashtab *h, const void *k) @@ -213,35 +211,33 @@ static int policydb_init(struct policydb *p) for (i = 0; i < SYM_NUM; i++) { rc = symtab_init(&p->symtab[i], symtab_sizes[i]); if (rc) - goto out_free_symtab; + goto out; } rc = avtab_init(&p->te_avtab); if (rc) - goto out_free_symtab; + goto out; rc = roles_init(p); if (rc) - goto out_free_symtab; + goto out; rc = cond_policydb_init(p); if (rc) - goto out_free_symtab; + goto out; p->range_tr = hashtab_create(rangetr_hash, rangetr_cmp, 256); if (!p->range_tr) - goto out_free_symtab; + goto out; ebitmap_init(&p->policycaps); ebitmap_init(&p->permissive_map); + return 0; out: - return rc; - -out_free_symtab: for (i = 0; i < SYM_NUM; i++) hashtab_destroy(p->symtab[i].table); - goto out; + return rc; } /* @@ -391,30 +387,27 @@ static int policydb_index_classes(struct policydb *p) { int rc; + rc = -ENOMEM; p->p_common_val_to_name = kmalloc(p->p_commons.nprim * sizeof(char *), GFP_KERNEL); - if (!p->p_common_val_to_name) { - rc = -ENOMEM; + if (!p->p_common_val_to_name) goto out; - } rc = hashtab_map(p->p_commons.table, common_index, p); if (rc) goto out; + rc = -ENOMEM; p->class_val_to_struct = kmalloc(p->p_classes.nprim * sizeof(*(p->class_val_to_struct)), GFP_KERNEL); - if (!p->class_val_to_struct) { - rc = -ENOMEM; + if (!p->class_val_to_struct) goto out; - } + rc = -ENOMEM; p->p_class_val_to_name = kmalloc(p->p_classes.nprim * sizeof(char *), GFP_KERNEL); - if (!p->p_class_val_to_name) { - rc = -ENOMEM; + if (!p->p_class_val_to_name) goto out; - } rc = hashtab_map(p->p_classes.table, class_index, p); out: @@ -460,7 +453,7 @@ static inline void rangetr_hash_eval(struct hashtab *h) */ static int policydb_index_others(struct policydb *p) { - int i, rc = 0; + int i, rc; printk(KERN_DEBUG "SELinux: %d users, %d roles, %d types, %d bools", p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, p->p_bools.nprim); @@ -477,47 +470,42 @@ static int policydb_index_others(struct policydb *p) symtab_hash_eval(p->symtab); #endif + rc = -ENOMEM; p->role_val_to_struct = kmalloc(p->p_roles.nprim * sizeof(*(p->role_val_to_struct)), GFP_KERNEL); - if (!p->role_val_to_struct) { - rc = -ENOMEM; + if (!p->role_val_to_struct) goto out; - } + rc = -ENOMEM; p->user_val_to_struct = kmalloc(p->p_users.nprim * sizeof(*(p->user_val_to_struct)), GFP_KERNEL); - if (!p->user_val_to_struct) { - rc = -ENOMEM; + if (!p->user_val_to_struct) goto out; - } + rc = -ENOMEM; p->type_val_to_struct = kmalloc(p->p_types.nprim * sizeof(*(p->type_val_to_struct)), GFP_KERNEL); - if (!p->type_val_to_struct) { - rc = -ENOMEM; + if (!p->type_val_to_struct) goto out; - } - if (cond_init_bool_indexes(p)) { - rc = -ENOMEM; + rc = -ENOMEM; + if (cond_init_bool_indexes(p)) goto out; - } for (i = SYM_ROLES; i < SYM_NUM; i++) { + rc = -ENOMEM; p->sym_val_to_name[i] = kmalloc(p->symtab[i].nprim * sizeof(char *), GFP_KERNEL); - if (!p->sym_val_to_name[i]) { - rc = -ENOMEM; + if (!p->sym_val_to_name[i]) goto out; - } rc = hashtab_map(p->symtab[i].table, index_f[i], p); if (rc) goto out; } - + rc = 0; out: return rc; } @@ -540,9 +528,11 @@ static int common_destroy(void *key, void *datum, void *p) struct common_datum *comdatum; kfree(key); - comdatum = datum; - hashtab_map(comdatum->permissions.table, perm_destroy, NULL); - hashtab_destroy(comdatum->permissions.table); + if (datum) { + comdatum = datum; + hashtab_map(comdatum->permissions.table, perm_destroy, NULL); + hashtab_destroy(comdatum->permissions.table); + } kfree(datum); return 0; } @@ -554,38 +544,40 @@ static int cls_destroy(void *key, void *datum, void *p) struct constraint_expr *e, *etmp; kfree(key); - cladatum = datum; - hashtab_map(cladatum->permissions.table, perm_destroy, NULL); - hashtab_destroy(cladatum->permissions.table); - constraint = cladatum->constraints; - while (constraint) { - e = constraint->expr; - while (e) { - ebitmap_destroy(&e->names); - etmp = e; - e = e->next; - kfree(etmp); + if (datum) { + cladatum = datum; + hashtab_map(cladatum->permissions.table, perm_destroy, NULL); + hashtab_destroy(cladatum->permissions.table); + constraint = cladatum->constraints; + while (constraint) { + e = constraint->expr; + while (e) { + ebitmap_destroy(&e->names); + etmp = e; + e = e->next; + kfree(etmp); + } + ctemp = constraint; + constraint = constraint->next; + kfree(ctemp); } - ctemp = constraint; - constraint = constraint->next; - kfree(ctemp); - } - - constraint = cladatum->validatetrans; - while (constraint) { - e = constraint->expr; - while (e) { - ebitmap_destroy(&e->names); - etmp = e; - e = e->next; - kfree(etmp); + + constraint = cladatum->validatetrans; + while (constraint) { + e = constraint->expr; + while (e) { + ebitmap_destroy(&e->names); + etmp = e; + e = e->next; + kfree(etmp); + } + ctemp = constraint; + constraint = constraint->next; + kfree(ctemp); } - ctemp = constraint; - constraint = constraint->next; - kfree(ctemp); - } - kfree(cladatum->comkey); + kfree(cladatum->comkey); + } kfree(datum); return 0; } @@ -595,9 +587,11 @@ static int role_destroy(void *key, void *datum, void *p) struct role_datum *role; kfree(key); - role = datum; - ebitmap_destroy(&role->dominates); - ebitmap_destroy(&role->types); + if (datum) { + role = datum; + ebitmap_destroy(&role->dominates); + ebitmap_destroy(&role->types); + } kfree(datum); return 0; } @@ -614,11 +608,13 @@ static int user_destroy(void *key, void *datum, void *p) struct user_datum *usrdatum; kfree(key); - usrdatum = datum; - ebitmap_destroy(&usrdatum->roles); - ebitmap_destroy(&usrdatum->range.level[0].cat); - ebitmap_destroy(&usrdatum->range.level[1].cat); - ebitmap_destroy(&usrdatum->dfltlevel.cat); + if (datum) { + usrdatum = datum; + ebitmap_destroy(&usrdatum->roles); + ebitmap_destroy(&usrdatum->range.level[0].cat); + ebitmap_destroy(&usrdatum->range.level[1].cat); + ebitmap_destroy(&usrdatum->dfltlevel.cat); + } kfree(datum); return 0; } @@ -628,9 +624,11 @@ static int sens_destroy(void *key, void *datum, void *p) struct level_datum *levdatum; kfree(key); - levdatum = datum; - ebitmap_destroy(&levdatum->level->cat); - kfree(levdatum->level); + if (datum) { + levdatum = datum; + ebitmap_destroy(&levdatum->level->cat); + kfree(levdatum->level); + } kfree(datum); return 0; } @@ -785,19 +783,21 @@ int policydb_load_isids(struct policydb *p, struct sidtab *s) head = p->ocontexts[OCON_ISID]; for (c = head; c; c = c->next) { + rc = -EINVAL; if (!c->context[0].user) { - printk(KERN_ERR "SELinux: SID %s was never " - "defined.\n", c->u.name); - rc = -EINVAL; + printk(KERN_ERR "SELinux: SID %s was never defined.\n", + c->u.name); goto out; } - if (sidtab_insert(s, c->sid[0], &c->context[0])) { - printk(KERN_ERR "SELinux: unable to load initial " - "SID %s.\n", c->u.name); - rc = -EINVAL; + + rc = sidtab_insert(s, c->sid[0], &c->context[0]); + if (rc) { + printk(KERN_ERR "SELinux: unable to load initial SID %s.\n", + c->u.name); goto out; } } + rc = 0; out: return rc; } @@ -846,8 +846,7 @@ int policydb_context_isvalid(struct policydb *p, struct context *c) * Role must be authorized for the type. */ role = p->role_val_to_struct[c->role - 1]; - if (!ebitmap_get_bit(&role->types, - c->type - 1)) + if (!ebitmap_get_bit(&role->types, c->type - 1)) /* role may not be associated with type */ return 0; @@ -858,8 +857,7 @@ int policydb_context_isvalid(struct policydb *p, struct context *c) if (!usrdatum) return 0; - if (!ebitmap_get_bit(&usrdatum->roles, - c->role - 1)) + if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1)) /* user may not be associated with role */ return 0; } @@ -881,20 +879,22 @@ static int mls_read_range_helper(struct mls_range *r, void *fp) int rc; rc = next_entry(buf, fp, sizeof(u32)); - if (rc < 0) + if (rc) goto out; + rc = -EINVAL; items = le32_to_cpu(buf[0]); if (items > ARRAY_SIZE(buf)) { printk(KERN_ERR "SELinux: mls: range overflow\n"); - rc = -EINVAL; goto out; } + rc = next_entry(buf, fp, sizeof(u32) * items); - if (rc < 0) { + if (rc) { printk(KERN_ERR "SELinux: mls: truncated range\n"); goto out; } + r->level[0].sens = le32_to_cpu(buf[0]); if (items > 1) r->level[1].sens = le32_to_cpu(buf[1]); @@ -903,15 +903,13 @@ static int mls_read_range_helper(struct mls_range *r, void *fp) rc = ebitmap_read(&r->level[0].cat, fp); if (rc) { - printk(KERN_ERR "SELinux: mls: error reading low " - "categories\n"); + printk(KERN_ERR "SELinux: mls: error reading low categories\n"); goto out; } if (items > 1) { rc = ebitmap_read(&r->level[1].cat, fp); if (rc) { - printk(KERN_ERR "SELinux: mls: error reading high " - "categories\n"); + printk(KERN_ERR "SELinux: mls: error reading high categories\n"); goto bad_high; } } else { @@ -922,12 +920,11 @@ static int mls_read_range_helper(struct mls_range *r, void *fp) } } - rc = 0; -out: - return rc; + return 0; bad_high: ebitmap_destroy(&r->level[0].cat); - goto out; +out: + return rc; } /* @@ -942,7 +939,7 @@ static int context_read_and_validate(struct context *c, int rc; rc = next_entry(buf, fp, sizeof buf); - if (rc < 0) { + if (rc) { printk(KERN_ERR "SELinux: context truncated\n"); goto out; } @@ -950,19 +947,20 @@ static int context_read_and_validate(struct context *c, c->role = le32_to_cpu(buf[1]); c->type = le32_to_cpu(buf[2]); if (p->policyvers >= POLICYDB_VERSION_MLS) { - if (mls_read_range_helper(&c->range, fp)) { - printk(KERN_ERR "SELinux: error reading MLS range of " - "context\n"); - rc = -EINVAL; + rc = mls_read_range_helper(&c->range, fp); + if (rc) { + printk(KERN_ERR "SELinux: error reading MLS range of context\n"); goto out; } } + rc = -EINVAL; if (!policydb_context_isvalid(p, c)) { printk(KERN_ERR "SELinux: invalid security context\n"); context_destroy(c); - rc = -EINVAL; + goto out; } + rc = 0; out: return rc; } @@ -981,37 +979,36 @@ static int perm_read(struct policydb *p, struct hashtab *h, void *fp) __le32 buf[2]; u32 len; + rc = -ENOMEM; perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL); - if (!perdatum) { - rc = -ENOMEM; - goto out; - } + if (!perdatum) + goto bad; rc = next_entry(buf, fp, sizeof buf); - if (rc < 0) + if (rc) goto bad; len = le32_to_cpu(buf[0]); perdatum->value = le32_to_cpu(buf[1]); + rc = -ENOMEM; key = kmalloc(len + 1, GFP_KERNEL); - if (!key) { - rc = -ENOMEM; + if (!key) goto bad; - } + rc = next_entry(key, fp, len); - if (rc < 0) + if (rc) goto bad; key[len] = '\0'; rc = hashtab_insert(h, key, perdatum); if (rc) goto bad; -out: - return rc; + + return 0; bad: perm_destroy(key, perdatum, NULL); - goto out; + return rc; } static int common_read(struct policydb *p, struct hashtab *h, void *fp) @@ -1022,14 +1019,13 @@ static int common_read(struct policydb *p, struct hashtab *h, void *fp) u32 len, nel; int i, rc; + rc = -ENOMEM; comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL); - if (!comdatum) { - rc = -ENOMEM; - goto out; - } + if (!comdatum) + goto bad; rc = next_entry(buf, fp, sizeof buf); - if (rc < 0) + if (rc) goto bad; len = le32_to_cpu(buf[0]); @@ -1041,13 +1037,13 @@ static int common_read(struct policydb *p, struct hashtab *h, void *fp) comdatum->permissions.nprim = le32_to_cpu(buf[2]); nel = le32_to_cpu(buf[3]); + rc = -ENOMEM; key = kmalloc(len + 1, GFP_KERNEL); - if (!key) { - rc = -ENOMEM; + if (!key) goto bad; - } + rc = next_entry(key, fp, len); - if (rc < 0) + if (rc) goto bad; key[len] = '\0'; @@ -1060,11 +1056,10 @@ static int common_read(struct policydb *p, struct hashtab *h, void *fp) rc = hashtab_insert(h, key, comdatum); if (rc) goto bad; -out: - return rc; + return 0; bad: common_destroy(key, comdatum, NULL); - goto out; + return rc; } static int read_cons_helper(struct constraint_node **nodep, int ncons, @@ -1088,7 +1083,7 @@ static int read_cons_helper(struct constraint_node **nodep, int ncons, *nodep = c; rc = next_entry(buf, fp, (sizeof(u32) * 2)); - if (rc < 0) + if (rc) return rc; c->permissions = le32_to_cpu(buf[0]); nexpr = le32_to_cpu(buf[1]); @@ -1105,7 +1100,7 @@ static int read_cons_helper(struct constraint_node **nodep, int ncons, c->expr = e; rc = next_entry(buf, fp, (sizeof(u32) * 3)); - if (rc < 0) + if (rc) return rc; e->expr_type = le32_to_cpu(buf[0]); e->attr = le32_to_cpu(buf[1]); @@ -1133,8 +1128,9 @@ static int read_cons_helper(struct constraint_node **nodep, int ncons, if (depth == (CEXPR_MAXDEPTH - 1)) return -EINVAL; depth++; - if (ebitmap_read(&e->names, fp)) - return -EINVAL; + rc = ebitmap_read(&e->names, fp); + if (rc) + return rc; break; default: return -EINVAL; @@ -1157,14 +1153,13 @@ static int class_read(struct policydb *p, struct hashtab *h, void *fp) u32 len, len2, ncons, nel; int i, rc; + rc = -ENOMEM; cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL); - if (!cladatum) { - rc = -ENOMEM; - goto out; - } + if (!cladatum) + goto bad; rc = next_entry(buf, fp, sizeof(u32)*6); - if (rc < 0) + if (rc) goto bad; len = le32_to_cpu(buf[0]); @@ -1179,33 +1174,30 @@ static int class_read(struct policydb *p, struct hashtab *h, void *fp) ncons = le32_to_cpu(buf[5]); + rc = -ENOMEM; key = kmalloc(len + 1, GFP_KERNEL); - if (!key) { - rc = -ENOMEM; + if (!key) goto bad; - } + rc = next_entry(key, fp, len); - if (rc < 0) + if (rc) goto bad; key[len] = '\0'; if (len2) { + rc = -ENOMEM; cladatum->comkey = kmalloc(len2 + 1, GFP_KERNEL); - if (!cladatum->comkey) { - rc = -ENOMEM; + if (!cladatum->comkey) goto bad; - } rc = next_entry(cladatum->comkey, fp, len2); - if (rc < 0) + if (rc) goto bad; cladatum->comkey[len2] = '\0'; - cladatum->comdatum = hashtab_search(p->p_commons.table, - cladatum->comkey); + rc = -EINVAL; + cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey); if (!cladatum->comdatum) { - printk(KERN_ERR "SELinux: unknown common %s\n", - cladatum->comkey); - rc = -EINVAL; + printk(KERN_ERR "SELinux: unknown common %s\n", cladatum->comkey); goto bad; } } @@ -1222,7 +1214,7 @@ static int class_read(struct policydb *p, struct hashtab *h, void *fp) if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) { /* grab the validatetrans rules */ rc = next_entry(buf, fp, sizeof(u32)); - if (rc < 0) + if (rc) goto bad; ncons = le32_to_cpu(buf[0]); rc = read_cons_helper(&cladatum->validatetrans, ncons, 1, fp); @@ -1234,12 +1226,10 @@ static int class_read(struct policydb *p, struct hashtab *h, void *fp) if (rc) goto bad; - rc = 0; -out: - return rc; + return 0; bad: cls_destroy(key, cladatum, NULL); - goto out; + return rc; } static int role_read(struct policydb *p, struct hashtab *h, void *fp) @@ -1250,17 +1240,16 @@ static int role_read(struct policydb *p, struct hashtab *h, void *fp) __le32 buf[3]; u32 len; + rc = -ENOMEM; role = kzalloc(sizeof(*role), GFP_KERNEL); - if (!role) { - rc = -ENOMEM; - goto out; - } + if (!role) + goto bad; if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) to_read = 3; rc = next_entry(buf, fp, sizeof(buf[0]) * to_read); - if (rc < 0) + if (rc) goto bad; len = le32_to_cpu(buf[0]); @@ -1268,13 +1257,13 @@ static int role_read(struct policydb *p, struct hashtab *h, void *fp) if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) role->bounds = le32_to_cpu(buf[2]); + rc = -ENOMEM; key = kmalloc(len + 1, GFP_KERNEL); - if (!key) { - rc = -ENOMEM; + if (!key) goto bad; - } + rc = next_entry(key, fp, len); - if (rc < 0) + if (rc) goto bad; key[len] = '\0'; @@ -1287,10 +1276,10 @@ static int role_read(struct policydb *p, struct hashtab *h, void *fp) goto bad; if (strcmp(key, OBJECT_R) == 0) { + rc = -EINVAL; if (role->value != OBJECT_R_VAL) { printk(KERN_ERR "SELinux: Role %s has wrong value %d\n", OBJECT_R, role->value); - rc = -EINVAL; goto bad; } rc = 0; @@ -1300,11 +1289,10 @@ static int role_read(struct policydb *p, struct hashtab *h, void *fp) rc = hashtab_insert(h, key, role); if (rc) goto bad; -out: - return rc; + return 0; bad: role_destroy(key, role, NULL); - goto out; + return rc; } static int type_read(struct policydb *p, struct hashtab *h, void *fp) @@ -1315,17 +1303,16 @@ static int type_read(struct policydb *p, struct hashtab *h, void *fp) __le32 buf[4]; u32 len; + rc = -ENOMEM; typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL); - if (!typdatum) { - rc = -ENOMEM; - return rc; - } + if (!typdatum) + goto bad; if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) to_read = 4; rc = next_entry(buf, fp, sizeof(buf[0]) * to_read); - if (rc < 0) + if (rc) goto bad; len = le32_to_cpu(buf[0]); @@ -1343,24 +1330,22 @@ static int type_read(struct policydb *p, struct hashtab *h, void *fp) typdatum->primary = le32_to_cpu(buf[2]); } + rc = -ENOMEM; key = kmalloc(len + 1, GFP_KERNEL); - if (!key) { - rc = -ENOMEM; + if (!key) goto bad; - } rc = next_entry(key, fp, len); - if (rc < 0) + if (rc) goto bad; key[len] = '\0'; rc = hashtab_insert(h, key, typdatum); if (rc) goto bad; -out: - return rc; + return 0; bad: type_destroy(key, typdatum, NULL); - goto out; + return rc; } @@ -1376,22 +1361,18 @@ static int mls_read_level(struct mls_level *lp, void *fp) memset(lp, 0, sizeof(*lp)); rc = next_entry(buf, fp, sizeof buf); - if (rc < 0) { + if (rc) { printk(KERN_ERR "SELinux: mls: truncated level\n"); - goto bad; + return rc; } lp->sens = le32_to_cpu(buf[0]); - if (ebitmap_read(&lp->cat, fp)) { - printk(KERN_ERR "SELinux: mls: error reading level " - "categories\n"); - goto bad; + rc = ebitmap_read(&lp->cat, fp); + if (rc) { + printk(KERN_ERR "SELinux: mls: error reading level categories\n"); + return rc; } - return 0; - -bad: - return -EINVAL; } static int user_read(struct policydb *p, struct hashtab *h, void *fp) @@ -1402,17 +1383,16 @@ static int user_read(struct policydb *p, struct hashtab *h, void *fp) __le32 buf[3]; u32 len; + rc = -ENOMEM; usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL); - if (!usrdatum) { - rc = -ENOMEM; - goto out; - } + if (!usrdatum) + goto bad; if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) to_read = 3; rc = next_entry(buf, fp, sizeof(buf[0]) * to_read); - if (rc < 0) + if (rc) goto bad; len = le32_to_cpu(buf[0]); @@ -1420,13 +1400,12 @@ static int user_read(struct policydb *p, struct hashtab *h, void *fp) if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) usrdatum->bounds = le32_to_cpu(buf[2]); + rc = -ENOMEM; key = kmalloc(len + 1, GFP_KERNEL); - if (!key) { - rc = -ENOMEM; + if (!key) goto bad; - } rc = next_entry(key, fp, len); - if (rc < 0) + if (rc) goto bad; key[len] = '\0'; @@ -1446,11 +1425,10 @@ static int user_read(struct policydb *p, struct hashtab *h, void *fp) rc = hashtab_insert(h, key, usrdatum); if (rc) goto bad; -out: - return rc; + return 0; bad: user_destroy(key, usrdatum, NULL); - goto out; + return rc; } static int sens_read(struct policydb *p, struct hashtab *h, void *fp) @@ -1461,47 +1439,43 @@ static int sens_read(struct policydb *p, struct hashtab *h, void *fp) __le32 buf[2]; u32 len; + rc = -ENOMEM; levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC); - if (!levdatum) { - rc = -ENOMEM; - goto out; - } + if (!levdatum) + goto bad; rc = next_entry(buf, fp, sizeof buf); - if (rc < 0) + if (rc) goto bad; len = le32_to_cpu(buf[0]); levdatum->isalias = le32_to_cpu(buf[1]); + rc = -ENOMEM; key = kmalloc(len + 1, GFP_ATOMIC); - if (!key) { - rc = -ENOMEM; + if (!key) goto bad; - } rc = next_entry(key, fp, len); - if (rc < 0) + if (rc) goto bad; key[len] = '\0'; + rc = -ENOMEM; levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC); - if (!levdatum->level) { - rc = -ENOMEM; + if (!levdatum->level) goto bad; - } - if (mls_read_level(levdatum->level, fp)) { - rc = -EINVAL; + + rc = mls_read_level(levdatum->level, fp); + if (rc) goto bad; - } rc = hashtab_insert(h, key, levdatum); if (rc) goto bad; -out: - return rc; + return 0; bad: sens_destroy(key, levdatum, NULL); - goto out; + return rc; } static int cat_read(struct policydb *p, struct hashtab *h, void *fp) @@ -1512,39 +1486,35 @@ static int cat_read(struct policydb *p, struct hashtab *h, void *fp) __le32 buf[3]; u32 len; + rc = -ENOMEM; catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC); - if (!catdatum) { - rc = -ENOMEM; - goto out; - } + if (!catdatum) + goto bad; rc = next_entry(buf, fp, sizeof buf); - if (rc < 0) + if (rc) goto bad; len = le32_to_cpu(buf[0]); catdatum->value = le32_to_cpu(buf[1]); catdatum->isalias = le32_to_cpu(buf[2]); + rc = -ENOMEM; key = kmalloc(len + 1, GFP_ATOMIC); - if (!key) { - rc = -ENOMEM; + if (!key) goto bad; - } rc = next_entry(key, fp, len); - if (rc < 0) + if (rc) goto bad; key[len] = '\0'; rc = hashtab_insert(h, key, catdatum); if (rc) goto bad; -out: - return rc; - + return 0; bad: cat_destroy(key, catdatum, NULL); - goto out; + return rc; } static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) = @@ -2066,13 +2036,14 @@ int policydb_read(struct policydb *p, void *fp) rc = policydb_init(p); if (rc) - goto out; + return rc; /* Read the magic number and string length. */ rc = next_entry(buf, fp, sizeof(u32) * 2); - if (rc < 0) + if (rc) goto bad; + rc = -EINVAL; if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) { printk(KERN_ERR "SELinux: policydb magic number 0x%x does " "not match expected magic number 0x%x\n", @@ -2080,6 +2051,7 @@ int policydb_read(struct policydb *p, void *fp) goto bad; } + rc = -EINVAL; len = le32_to_cpu(buf[1]); if (len != strlen(POLICYDB_STRING)) { printk(KERN_ERR "SELinux: policydb string length %d does not " @@ -2087,19 +2059,23 @@ int policydb_read(struct policydb *p, void *fp) len, strlen(POLICYDB_STRING)); goto bad; } + + rc = -ENOMEM; policydb_str = kmalloc(len + 1, GFP_KERNEL); if (!policydb_str) { printk(KERN_ERR "SELinux: unable to allocate memory for policydb " "string of length %d\n", len); - rc = -ENOMEM; goto bad; } + rc = next_entry(policydb_str, fp, len); - if (rc < 0) { + if (rc) { printk(KERN_ERR "SELinux: truncated policydb string identifier\n"); kfree(policydb_str); goto bad; } + + rc = -EINVAL; policydb_str[len] = '\0'; if (strcmp(policydb_str, POLICYDB_STRING)) { printk(KERN_ERR "SELinux: policydb string %s does not match " @@ -2113,9 +2089,10 @@ int policydb_read(struct policydb *p, void *fp) /* Read the version and table sizes. */ rc = next_entry(buf, fp, sizeof(u32)*4); - if (rc < 0) + if (rc) goto bad; + rc = -EINVAL; p->policyvers = le32_to_cpu(buf[0]); if (p->policyvers < POLICYDB_VERSION_MIN || p->policyvers > POLICYDB_VERSION_MAX) { @@ -2128,6 +2105,7 @@ int policydb_read(struct policydb *p, void *fp) if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) { p->mls_enabled = 1; + rc = -EINVAL; if (p->policyvers < POLICYDB_VERSION_MLS) { printk(KERN_ERR "SELinux: security policydb version %d " "(MLS) not backwards compatible\n", @@ -2138,14 +2116,19 @@ int policydb_read(struct policydb *p, void *fp) p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN); p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN); - if (p->policyvers >= POLICYDB_VERSION_POLCAP && - ebitmap_read(&p->policycaps, fp) != 0) - goto bad; + if (p->policyvers >= POLICYDB_VERSION_POLCAP) { + rc = ebitmap_read(&p->policycaps, fp); + if (rc) + goto bad; + } - if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE && - ebitmap_read(&p->permissive_map, fp) != 0) - goto bad; + if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) { + rc = ebitmap_read(&p->permissive_map, fp); + if (rc) + goto bad; + } + rc = -EINVAL; info = policydb_lookup_compat(p->policyvers); if (!info) { printk(KERN_ERR "SELinux: unable to find policy compat info " @@ -2153,6 +2136,7 @@ int policydb_read(struct policydb *p, void *fp) goto bad; } + rc = -EINVAL; if (le32_to_cpu(buf[2]) != info->sym_num || le32_to_cpu(buf[3]) != info->ocon_num) { printk(KERN_ERR "SELinux: policydb table sizes (%d,%d) do " @@ -2164,7 +2148,7 @@ int policydb_read(struct policydb *p, void *fp) for (i = 0; i < info->sym_num; i++) { rc = next_entry(buf, fp, sizeof(u32)*2); - if (rc < 0) + if (rc) goto bad; nprim = le32_to_cpu(buf[0]); nel = le32_to_cpu(buf[1]); @@ -2188,60 +2172,58 @@ int policydb_read(struct policydb *p, void *fp) } rc = next_entry(buf, fp, sizeof(u32)); - if (rc < 0) + if (rc) goto bad; nel = le32_to_cpu(buf[0]); ltr = NULL; for (i = 0; i < nel; i++) { + rc = -ENOMEM; tr = kzalloc(sizeof(*tr), GFP_KERNEL); - if (!tr) { - rc = -ENOMEM; + if (!tr) goto bad; - } if (ltr) ltr->next = tr; else p->role_tr = tr; rc = next_entry(buf, fp, sizeof(u32)*3); - if (rc < 0) + if (rc) goto bad; + + rc = -EINVAL; tr->role = le32_to_cpu(buf[0]); tr->type = le32_to_cpu(buf[1]); tr->new_role = le32_to_cpu(buf[2]); if (!policydb_role_isvalid(p, tr->role) || !policydb_type_isvalid(p, tr->type) || - !policydb_role_isvalid(p, tr->new_role)) { - rc = -EINVAL; + !policydb_role_isvalid(p, tr->new_role)) goto bad; - } ltr = tr; } rc = next_entry(buf, fp, sizeof(u32)); - if (rc < 0) + if (rc) goto bad; nel = le32_to_cpu(buf[0]); lra = NULL; for (i = 0; i < nel; i++) { + rc = -ENOMEM; ra = kzalloc(sizeof(*ra), GFP_KERNEL); - if (!ra) { - rc = -ENOMEM; + if (!ra) goto bad; - } if (lra) lra->next = ra; else p->role_allow = ra; rc = next_entry(buf, fp, sizeof(u32)*2); - if (rc < 0) + if (rc) goto bad; + + rc = -EINVAL; ra->role = le32_to_cpu(buf[0]); ra->new_role = le32_to_cpu(buf[1]); if (!policydb_role_isvalid(p, ra->role) || - !policydb_role_isvalid(p, ra->new_role)) { - rc = -EINVAL; + !policydb_role_isvalid(p, ra->new_role)) goto bad; - } lra = ra; } @@ -2253,13 +2235,14 @@ int policydb_read(struct policydb *p, void *fp) if (rc) goto bad; + rc = -EINVAL; p->process_class = string_to_security_class(p, "process"); if (!p->process_class) goto bad; - p->process_trans_perms = string_to_av_perm(p, p->process_class, - "transition"); - p->process_trans_perms |= string_to_av_perm(p, p->process_class, - "dyntransition"); + + rc = -EINVAL; + p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition"); + p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition"); if (!p->process_trans_perms) goto bad; @@ -2312,8 +2295,6 @@ int policydb_read(struct policydb *p, void *fp) out: return rc; bad: - if (!rc) - rc = -EINVAL; policydb_destroy(p); goto out; } @@ -3076,7 +3057,7 @@ int policydb_write(struct policydb *p, void *fp) if (!info) { printk(KERN_ERR "SELinux: compatibility lookup failed for policy " "version %d", p->policyvers); - return rc; + return -EINVAL; } buf[0] = cpu_to_le32(p->policyvers); -- cgit v1.2.3 From b77a493b1dc8010245feeac001e5c7ed0988678f Mon Sep 17 00:00:00 2001 From: Eric Paris Date: Tue, 23 Nov 2010 11:40:08 -0500 Subject: SELinux: standardize return code handling in selinuxfs.c selinuxfs.c has lots of different standards on how to handle return paths on error. For the most part transition to rc=errno if (failure) goto out; [...] out: cleanup() return rc; Instead of doing cleanup mid function, or having multiple returns or other options. This doesn't do that for every function, but most of the complex functions which have cleanup routines on error. Signed-off-by: Eric Paris --- security/selinux/selinuxfs.c | 648 +++++++++++++++++++++---------------------- 1 file changed, 311 insertions(+), 337 deletions(-) (limited to 'security') diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c index 073fd5b0a53a..8bae68e21af9 100644 --- a/security/selinux/selinuxfs.c +++ b/security/selinux/selinuxfs.c @@ -141,19 +141,24 @@ static ssize_t sel_write_enforce(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - char *page; + char *page = NULL; ssize_t length; int new_value; + length = -ENOMEM; if (count >= PAGE_SIZE) - return -ENOMEM; - if (*ppos != 0) { - /* No partial writes. */ - return -EINVAL; - } + goto out; + + /* No partial writes. */ + length = EINVAL; + if (*ppos != 0) + goto out; + + length = -ENOMEM; page = (char *)get_zeroed_page(GFP_KERNEL); if (!page) - return -ENOMEM; + goto out; + length = -EFAULT; if (copy_from_user(page, buf, count)) goto out; @@ -268,20 +273,25 @@ static ssize_t sel_write_disable(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - char *page; + char *page = NULL; ssize_t length; int new_value; extern int selinux_disable(void); + length = -ENOMEM; if (count >= PAGE_SIZE) - return -ENOMEM; - if (*ppos != 0) { - /* No partial writes. */ - return -EINVAL; - } + goto out;; + + /* No partial writes. */ + length = -EINVAL; + if (*ppos != 0) + goto out; + + length = -ENOMEM; page = (char *)get_zeroed_page(GFP_KERNEL); if (!page) - return -ENOMEM; + goto out; + length = -EFAULT; if (copy_from_user(page, buf, count)) goto out; @@ -292,7 +302,7 @@ static ssize_t sel_write_disable(struct file *file, const char __user *buf, if (new_value) { length = selinux_disable(); - if (length < 0) + if (length) goto out; audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, "selinux=0 auid=%u ses=%u", @@ -493,7 +503,6 @@ static ssize_t sel_write_load(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - int ret; ssize_t length; void *data = NULL; @@ -503,17 +512,19 @@ static ssize_t sel_write_load(struct file *file, const char __user *buf, if (length) goto out; - if (*ppos != 0) { - /* No partial writes. */ - length = -EINVAL; + /* No partial writes. */ + length = -EINVAL; + if (*ppos != 0) goto out; - } - if ((count > 64 * 1024 * 1024) - || (data = vmalloc(count)) == NULL) { - length = -ENOMEM; + length = -EFBIG; + if (count > 64 * 1024 * 1024) + goto out; + + length = -ENOMEM; + data = vmalloc(count); + if (!data) goto out; - } length = -EFAULT; if (copy_from_user(data, buf, count) != 0) @@ -523,23 +534,19 @@ static ssize_t sel_write_load(struct file *file, const char __user *buf, if (length) goto out; - ret = sel_make_bools(); - if (ret) { - length = ret; + length = sel_make_bools(); + if (length) goto out1; - } - ret = sel_make_classes(); - if (ret) { - length = ret; + length = sel_make_classes(); + if (length) goto out1; - } - ret = sel_make_policycap(); - if (ret) - length = ret; - else - length = count; + length = sel_make_policycap(); + if (length) + goto out1; + + length = count; out1: audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, @@ -559,26 +566,26 @@ static const struct file_operations sel_load_ops = { static ssize_t sel_write_context(struct file *file, char *buf, size_t size) { - char *canon; + char *canon = NULL; u32 sid, len; ssize_t length; length = task_has_security(current, SECURITY__CHECK_CONTEXT); if (length) - return length; + goto out; length = security_context_to_sid(buf, size, &sid); - if (length < 0) - return length; + if (length) + goto out; length = security_sid_to_context(sid, &canon, &len); - if (length < 0) - return length; + if (length) + goto out; + length = -ERANGE; if (len > SIMPLE_TRANSACTION_LIMIT) { printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " "payload max\n", __func__, len); - length = -ERANGE; goto out; } @@ -602,23 +609,28 @@ static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - char *page; + char *page = NULL; ssize_t length; unsigned int new_value; length = task_has_security(current, SECURITY__SETCHECKREQPROT); if (length) - return length; + goto out; + length = -ENOMEM; if (count >= PAGE_SIZE) - return -ENOMEM; - if (*ppos != 0) { - /* No partial writes. */ - return -EINVAL; - } + goto out; + + /* No partial writes. */ + length = -EINVAL; + if (*ppos != 0) + goto out; + + length = -ENOMEM; page = (char *)get_zeroed_page(GFP_KERNEL); if (!page) - return -ENOMEM; + goto out; + length = -EFAULT; if (copy_from_user(page, buf, count)) goto out; @@ -693,7 +705,7 @@ static const struct file_operations transaction_ops = { static ssize_t sel_write_access(struct file *file, char *buf, size_t size) { - char *scon, *tcon; + char *scon = NULL, *tcon = NULL; u32 ssid, tsid; u16 tclass; struct av_decision avd; @@ -701,27 +713,29 @@ static ssize_t sel_write_access(struct file *file, char *buf, size_t size) length = task_has_security(current, SECURITY__COMPUTE_AV); if (length) - return length; + goto out; length = -ENOMEM; scon = kzalloc(size + 1, GFP_KERNEL); if (!scon) - return length; + goto out; + length = -ENOMEM; tcon = kzalloc(size + 1, GFP_KERNEL); if (!tcon) goto out; length = -EINVAL; if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) - goto out2; + goto out; length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); - if (length < 0) - goto out2; + if (length) + goto out; + length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); - if (length < 0) - goto out2; + if (length) + goto out; security_compute_av_user(ssid, tsid, tclass, &avd); @@ -730,133 +744,131 @@ static ssize_t sel_write_access(struct file *file, char *buf, size_t size) avd.allowed, 0xffffffff, avd.auditallow, avd.auditdeny, avd.seqno, avd.flags); -out2: - kfree(tcon); out: + kfree(tcon); kfree(scon); return length; } static ssize_t sel_write_create(struct file *file, char *buf, size_t size) { - char *scon, *tcon; + char *scon = NULL, *tcon = NULL; u32 ssid, tsid, newsid; u16 tclass; ssize_t length; - char *newcon; + char *newcon = NULL; u32 len; length = task_has_security(current, SECURITY__COMPUTE_CREATE); if (length) - return length; + goto out; length = -ENOMEM; scon = kzalloc(size + 1, GFP_KERNEL); if (!scon) - return length; + goto out; + length = -ENOMEM; tcon = kzalloc(size + 1, GFP_KERNEL); if (!tcon) goto out; length = -EINVAL; if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) - goto out2; + goto out; length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); - if (length < 0) - goto out2; + if (length) + goto out; + length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); - if (length < 0) - goto out2; + if (length) + goto out; length = security_transition_sid_user(ssid, tsid, tclass, &newsid); - if (length < 0) - goto out2; + if (length) + goto out; length = security_sid_to_context(newsid, &newcon, &len); - if (length < 0) - goto out2; + if (length) + goto out; + length = -ERANGE; if (len > SIMPLE_TRANSACTION_LIMIT) { printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " "payload max\n", __func__, len); - length = -ERANGE; - goto out3; + goto out; } memcpy(buf, newcon, len); length = len; -out3: +out: kfree(newcon); -out2: kfree(tcon); -out: kfree(scon); return length; } static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) { - char *scon, *tcon; + char *scon = NULL, *tcon = NULL; u32 ssid, tsid, newsid; u16 tclass; ssize_t length; - char *newcon; + char *newcon = NULL; u32 len; length = task_has_security(current, SECURITY__COMPUTE_RELABEL); if (length) - return length; + goto out; length = -ENOMEM; scon = kzalloc(size + 1, GFP_KERNEL); if (!scon) - return length; + goto out; + length = -ENOMEM; tcon = kzalloc(size + 1, GFP_KERNEL); if (!tcon) goto out; length = -EINVAL; if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) - goto out2; + goto out; length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); - if (length < 0) - goto out2; + if (length) + goto out; + length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); - if (length < 0) - goto out2; + if (length) + goto out; length = security_change_sid(ssid, tsid, tclass, &newsid); - if (length < 0) - goto out2; + if (length) + goto out; length = security_sid_to_context(newsid, &newcon, &len); - if (length < 0) - goto out2; + if (length) + goto out; - if (len > SIMPLE_TRANSACTION_LIMIT) { - length = -ERANGE; - goto out3; - } + length = -ERANGE; + if (len > SIMPLE_TRANSACTION_LIMIT) + goto out; memcpy(buf, newcon, len); length = len; -out3: +out: kfree(newcon); -out2: kfree(tcon); -out: kfree(scon); return length; } static ssize_t sel_write_user(struct file *file, char *buf, size_t size) { - char *con, *user, *ptr; - u32 sid, *sids; + char *con = NULL, *user = NULL, *ptr; + u32 sid, *sids = NULL; ssize_t length; char *newcon; int i, rc; @@ -864,28 +876,29 @@ static ssize_t sel_write_user(struct file *file, char *buf, size_t size) length = task_has_security(current, SECURITY__COMPUTE_USER); if (length) - return length; + goto out;; length = -ENOMEM; con = kzalloc(size + 1, GFP_KERNEL); if (!con) - return length; + goto out;; + length = -ENOMEM; user = kzalloc(size + 1, GFP_KERNEL); if (!user) goto out; length = -EINVAL; if (sscanf(buf, "%s %s", con, user) != 2) - goto out2; + goto out; length = security_context_to_sid(con, strlen(con) + 1, &sid); - if (length < 0) - goto out2; + if (length) + goto out; length = security_get_user_sids(sid, user, &sids, &nsids); - if (length < 0) - goto out2; + if (length) + goto out; length = sprintf(buf, "%u", nsids) + 1; ptr = buf + length; @@ -893,82 +906,80 @@ static ssize_t sel_write_user(struct file *file, char *buf, size_t size) rc = security_sid_to_context(sids[i], &newcon, &len); if (rc) { length = rc; - goto out3; + goto out; } if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { kfree(newcon); length = -ERANGE; - goto out3; + goto out; } memcpy(ptr, newcon, len); kfree(newcon); ptr += len; length += len; } -out3: +out: kfree(sids); -out2: kfree(user); -out: kfree(con); return length; } static ssize_t sel_write_member(struct file *file, char *buf, size_t size) { - char *scon, *tcon; + char *scon = NULL, *tcon = NULL; u32 ssid, tsid, newsid; u16 tclass; ssize_t length; - char *newcon; + char *newcon = NULL; u32 len; length = task_has_security(current, SECURITY__COMPUTE_MEMBER); if (length) - return length; + goto out; length = -ENOMEM; scon = kzalloc(size + 1, GFP_KERNEL); if (!scon) - return length; + goto out;; + length = -ENOMEM; tcon = kzalloc(size + 1, GFP_KERNEL); if (!tcon) goto out; length = -EINVAL; if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) - goto out2; + goto out; length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); - if (length < 0) - goto out2; + if (length) + goto out; + length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); - if (length < 0) - goto out2; + if (length) + goto out; length = security_member_sid(ssid, tsid, tclass, &newsid); - if (length < 0) - goto out2; + if (length) + goto out; length = security_sid_to_context(newsid, &newcon, &len); - if (length < 0) - goto out2; + if (length) + goto out; + length = -ERANGE; if (len > SIMPLE_TRANSACTION_LIMIT) { printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " "payload max\n", __func__, len); - length = -ERANGE; - goto out3; + goto out; } memcpy(buf, newcon, len); length = len; -out3: +out: kfree(newcon); -out2: kfree(tcon); -out: kfree(scon); return length; } @@ -998,16 +1009,14 @@ static ssize_t sel_read_bool(struct file *filep, char __user *buf, mutex_lock(&sel_mutex); - if (index >= bool_num || strcmp(name, bool_pending_names[index])) { - ret = -EINVAL; + ret = -EINVAL; + if (index >= bool_num || strcmp(name, bool_pending_names[index])) goto out; - } + ret = -ENOMEM; page = (char *)get_zeroed_page(GFP_KERNEL); - if (!page) { - ret = -ENOMEM; + if (!page) goto out; - } cur_enforcing = security_get_bool_value(index); if (cur_enforcing < 0) { @@ -1019,8 +1028,7 @@ static ssize_t sel_read_bool(struct file *filep, char __user *buf, ret = simple_read_from_buffer(buf, count, ppos, page, length); out: mutex_unlock(&sel_mutex); - if (page) - free_page((unsigned long)page); + free_page((unsigned long)page); return ret; } @@ -1040,26 +1048,23 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf, if (length) goto out; - if (index >= bool_num || strcmp(name, bool_pending_names[index])) { - length = -EINVAL; + length = -EINVAL; + if (index >= bool_num || strcmp(name, bool_pending_names[index])) goto out; - } - if (count >= PAGE_SIZE) { - length = -ENOMEM; + length = -ENOMEM; + if (count >= PAGE_SIZE) goto out; - } - if (*ppos != 0) { - /* No partial writes. */ - length = -EINVAL; + /* No partial writes. */ + length = -EINVAL; + if (*ppos != 0) goto out; - } + + length = -ENOMEM; page = (char *)get_zeroed_page(GFP_KERNEL); - if (!page) { - length = -ENOMEM; + if (!page) goto out; - } length = -EFAULT; if (copy_from_user(page, buf, count)) @@ -1077,8 +1082,7 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf, out: mutex_unlock(&sel_mutex); - if (page) - free_page((unsigned long) page); + free_page((unsigned long) page); return length; } @@ -1102,19 +1106,19 @@ static ssize_t sel_commit_bools_write(struct file *filep, if (length) goto out; - if (count >= PAGE_SIZE) { - length = -ENOMEM; + length = -ENOMEM; + if (count >= PAGE_SIZE) goto out; - } - if (*ppos != 0) { - /* No partial writes. */ + + /* No partial writes. */ + length = -EINVAL; + if (*ppos != 0) goto out; - } + + length = -ENOMEM; page = (char *)get_zeroed_page(GFP_KERNEL); - if (!page) { - length = -ENOMEM; + if (!page) goto out; - } length = -EFAULT; if (copy_from_user(page, buf, count)) @@ -1124,15 +1128,16 @@ static ssize_t sel_commit_bools_write(struct file *filep, if (sscanf(page, "%d", &new_value) != 1) goto out; + length = 0; if (new_value && bool_pending_values) - security_set_bools(bool_num, bool_pending_values); + length = security_set_bools(bool_num, bool_pending_values); - length = count; + if (!length) + length = count; out: mutex_unlock(&sel_mutex); - if (page) - free_page((unsigned long) page); + free_page((unsigned long) page); return length; } @@ -1169,7 +1174,7 @@ static void sel_remove_entries(struct dentry *de) static int sel_make_bools(void) { - int i, ret = 0; + int i, ret; ssize_t len; struct dentry *dentry = NULL; struct dentry *dir = bool_dir; @@ -1190,38 +1195,40 @@ static int sel_make_bools(void) sel_remove_entries(dir); + ret = -ENOMEM; page = (char *)get_zeroed_page(GFP_KERNEL); if (!page) - return -ENOMEM; + goto out; ret = security_get_bools(&num, &names, &values); - if (ret != 0) + if (ret) goto out; for (i = 0; i < num; i++) { + ret = -ENOMEM; dentry = d_alloc_name(dir, names[i]); - if (!dentry) { - ret = -ENOMEM; - goto err; - } + if (!dentry) + goto out; + + ret = -ENOMEM; inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); - if (!inode) { - ret = -ENOMEM; - goto err; - } + if (!inode) + goto out; + ret = -EINVAL; len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); - if (len < 0) { - ret = -EINVAL; - goto err; - } else if (len >= PAGE_SIZE) { - ret = -ENAMETOOLONG; - goto err; - } + if (len < 0) + goto out; + + ret = -ENAMETOOLONG; + if (len >= PAGE_SIZE) + goto out; + isec = (struct inode_security_struct *)inode->i_security; ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid); if (ret) - goto err; + goto out; + isec->sid = sid; isec->initialized = 1; inode->i_fop = &sel_bool_ops; @@ -1231,10 +1238,12 @@ static int sel_make_bools(void) bool_num = num; bool_pending_names = names; bool_pending_values = values; + + free_page((unsigned long)page); + return 0; out: free_page((unsigned long)page); - return ret; -err: + if (names) { for (i = 0; i < num; i++) kfree(names[i]); @@ -1242,8 +1251,8 @@ err: } kfree(values); sel_remove_entries(dir); - ret = -ENOMEM; - goto out; + + return ret; } #define NULL_FILE_NAME "null" @@ -1265,47 +1274,41 @@ static ssize_t sel_write_avc_cache_threshold(struct file *file, size_t count, loff_t *ppos) { - char *page; + char *page = NULL; ssize_t ret; int new_value; - if (count >= PAGE_SIZE) { - ret = -ENOMEM; + ret = task_has_security(current, SECURITY__SETSECPARAM); + if (ret) goto out; - } - if (*ppos != 0) { - /* No partial writes. */ - ret = -EINVAL; + ret = -ENOMEM; + if (count >= PAGE_SIZE) goto out; - } + /* No partial writes. */ + ret = -EINVAL; + if (*ppos != 0) + goto out; + + ret = -ENOMEM; page = (char *)get_zeroed_page(GFP_KERNEL); - if (!page) { - ret = -ENOMEM; + if (!page) goto out; - } - if (copy_from_user(page, buf, count)) { - ret = -EFAULT; - goto out_free; - } + ret = -EFAULT; + if (copy_from_user(page, buf, count)) + goto out; - if (sscanf(page, "%u", &new_value) != 1) { - ret = -EINVAL; + ret = -EINVAL; + if (sscanf(page, "%u", &new_value) != 1) goto out; - } - if (new_value != avc_cache_threshold) { - ret = task_has_security(current, SECURITY__SETSECPARAM); - if (ret) - goto out_free; - avc_cache_threshold = new_value; - } + avc_cache_threshold = new_value; + ret = count; -out_free: - free_page((unsigned long)page); out: + free_page((unsigned long)page); return ret; } @@ -1313,19 +1316,18 @@ static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { char *page; - ssize_t ret = 0; + ssize_t length; page = (char *)__get_free_page(GFP_KERNEL); - if (!page) { - ret = -ENOMEM; - goto out; - } - ret = avc_get_hash_stats(page); - if (ret >= 0) - ret = simple_read_from_buffer(buf, count, ppos, page, ret); + if (!page) + return -ENOMEM; + + length = avc_get_hash_stats(page); + if (length >= 0) + length = simple_read_from_buffer(buf, count, ppos, page, length); free_page((unsigned long)page); -out: - return ret; + + return length; } static const struct file_operations sel_avc_cache_threshold_ops = { @@ -1407,7 +1409,7 @@ static const struct file_operations sel_avc_cache_stats_ops = { static int sel_make_avc_files(struct dentry *dir) { - int i, ret = 0; + int i; static struct tree_descr files[] = { { "cache_threshold", &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, @@ -1422,22 +1424,19 @@ static int sel_make_avc_files(struct dentry *dir) struct dentry *dentry; dentry = d_alloc_name(dir, files[i].name); - if (!dentry) { - ret = -ENOMEM; - goto out; - } + if (!dentry) + return -ENOMEM; inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); - if (!inode) { - ret = -ENOMEM; - goto out; - } + if (!inode) + return -ENOMEM; + inode->i_fop = files[i].ops; inode->i_ino = ++sel_last_ino; d_add(dentry, inode); } -out: - return ret; + + return 0; } static ssize_t sel_read_initcon(struct file *file, char __user *buf, @@ -1451,7 +1450,7 @@ static ssize_t sel_read_initcon(struct file *file, char __user *buf, inode = file->f_path.dentry->d_inode; sid = inode->i_ino&SEL_INO_MASK; ret = security_sid_to_context(sid, &con, &len); - if (ret < 0) + if (ret) return ret; ret = simple_read_from_buffer(buf, count, ppos, con, len); @@ -1466,28 +1465,25 @@ static const struct file_operations sel_initcon_ops = { static int sel_make_initcon_files(struct dentry *dir) { - int i, ret = 0; + int i; for (i = 1; i <= SECINITSID_NUM; i++) { struct inode *inode; struct dentry *dentry; dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); - if (!dentry) { - ret = -ENOMEM; - goto out; - } + if (!dentry) + return -ENOMEM; inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); - if (!inode) { - ret = -ENOMEM; - goto out; - } + if (!inode) + return -ENOMEM; + inode->i_fop = &sel_initcon_ops; inode->i_ino = i|SEL_INITCON_INO_OFFSET; d_add(dentry, inode); } -out: - return ret; + + return 0; } static inline unsigned int sel_div(unsigned long a, unsigned long b) @@ -1523,15 +1519,13 @@ static ssize_t sel_read_class(struct file *file, char __user *buf, unsigned long ino = file->f_path.dentry->d_inode->i_ino; page = (char *)__get_free_page(GFP_KERNEL); - if (!page) { - rc = -ENOMEM; - goto out; - } + if (!page) + return -ENOMEM; len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino)); rc = simple_read_from_buffer(buf, count, ppos, page, len); free_page((unsigned long)page); -out: + return rc; } @@ -1548,15 +1542,13 @@ static ssize_t sel_read_perm(struct file *file, char __user *buf, unsigned long ino = file->f_path.dentry->d_inode->i_ino; page = (char *)__get_free_page(GFP_KERNEL); - if (!page) { - rc = -ENOMEM; - goto out; - } + if (!page) + return -ENOMEM; len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino)); rc = simple_read_from_buffer(buf, count, ppos, page, len); free_page((unsigned long)page); -out: + return rc; } @@ -1587,39 +1579,37 @@ static const struct file_operations sel_policycap_ops = { static int sel_make_perm_files(char *objclass, int classvalue, struct dentry *dir) { - int i, rc = 0, nperms; + int i, rc, nperms; char **perms; rc = security_get_permissions(objclass, &perms, &nperms); if (rc) - goto out; + return rc; for (i = 0; i < nperms; i++) { struct inode *inode; struct dentry *dentry; + rc = -ENOMEM; dentry = d_alloc_name(dir, perms[i]); - if (!dentry) { - rc = -ENOMEM; - goto out1; - } + if (!dentry) + goto out; + rc = -ENOMEM; inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); - if (!inode) { - rc = -ENOMEM; - goto out1; - } + if (!inode) + goto out; + inode->i_fop = &sel_perm_ops; /* i+1 since perm values are 1-indexed */ inode->i_ino = sel_perm_to_ino(classvalue, i + 1); d_add(dentry, inode); } - -out1: + rc = 0; +out: for (i = 0; i < nperms; i++) kfree(perms[i]); kfree(perms); -out: return rc; } @@ -1631,34 +1621,27 @@ static int sel_make_class_dir_entries(char *classname, int index, int rc; dentry = d_alloc_name(dir, "index"); - if (!dentry) { - rc = -ENOMEM; - goto out; - } + if (!dentry) + return -ENOMEM; inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); - if (!inode) { - rc = -ENOMEM; - goto out; - } + if (!inode) + return -ENOMEM; inode->i_fop = &sel_class_ops; inode->i_ino = sel_class_to_ino(index); d_add(dentry, inode); dentry = d_alloc_name(dir, "perms"); - if (!dentry) { - rc = -ENOMEM; - goto out; - } + if (!dentry) + return -ENOMEM; rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino); if (rc) - goto out; + return rc; rc = sel_make_perm_files(classname, index, dentry); -out: return rc; } @@ -1688,15 +1671,15 @@ static void sel_remove_classes(void) static int sel_make_classes(void) { - int rc = 0, nclasses, i; + int rc, nclasses, i; char **classes; /* delete any existing entries */ sel_remove_classes(); rc = security_get_classes(&classes, &nclasses); - if (rc < 0) - goto out; + if (rc) + return rc; /* +2 since classes are 1-indexed */ last_class_ino = sel_class_to_ino(nclasses + 2); @@ -1704,29 +1687,27 @@ static int sel_make_classes(void) for (i = 0; i < nclasses; i++) { struct dentry *class_name_dir; + rc = -ENOMEM; class_name_dir = d_alloc_name(class_dir, classes[i]); - if (!class_name_dir) { - rc = -ENOMEM; - goto out1; - } + if (!class_name_dir) + goto out; rc = sel_make_dir(class_dir->d_inode, class_name_dir, &last_class_ino); if (rc) - goto out1; + goto out; /* i+1 since class values are 1-indexed */ rc = sel_make_class_dir_entries(classes[i], i + 1, class_name_dir); if (rc) - goto out1; + goto out; } - -out1: + rc = 0; +out: for (i = 0; i < nclasses; i++) kfree(classes[i]); kfree(classes); -out: return rc; } @@ -1763,14 +1744,12 @@ static int sel_make_policycap(void) static int sel_make_dir(struct inode *dir, struct dentry *dentry, unsigned long *ino) { - int ret = 0; struct inode *inode; inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO); - if (!inode) { - ret = -ENOMEM; - goto out; - } + if (!inode) + return -ENOMEM; + inode->i_op = &simple_dir_inode_operations; inode->i_fop = &simple_dir_operations; inode->i_ino = ++(*ino); @@ -1779,8 +1758,8 @@ static int sel_make_dir(struct inode *dir, struct dentry *dentry, d_add(dentry, inode); /* bump link count on parent directory, too */ inc_nlink(dir); -out: - return ret; + + return 0; } static int sel_fill_super(struct super_block *sb, void *data, int silent) @@ -1816,11 +1795,10 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent) root_inode = sb->s_root->d_inode; + ret = -ENOMEM; dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME); - if (!dentry) { - ret = -ENOMEM; + if (!dentry) goto err; - } ret = sel_make_dir(root_inode, dentry, &sel_last_ino); if (ret) @@ -1828,17 +1806,16 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent) bool_dir = dentry; + ret = -ENOMEM; dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); - if (!dentry) { - ret = -ENOMEM; + if (!dentry) goto err; - } + ret = -ENOMEM; inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); - if (!inode) { - ret = -ENOMEM; + if (!inode) goto err; - } + inode->i_ino = ++sel_last_ino; isec = (struct inode_security_struct *)inode->i_security; isec->sid = SECINITSID_DEVNULL; @@ -1849,11 +1826,10 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent) d_add(dentry, inode); selinux_null = dentry; + ret = -ENOMEM; dentry = d_alloc_name(sb->s_root, "avc"); - if (!dentry) { - ret = -ENOMEM; + if (!dentry) goto err; - } ret = sel_make_dir(root_inode, dentry, &sel_last_ino); if (ret) @@ -1863,11 +1839,10 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent) if (ret) goto err; + ret = -ENOMEM; dentry = d_alloc_name(sb->s_root, "initial_contexts"); - if (!dentry) { - ret = -ENOMEM; + if (!dentry) goto err; - } ret = sel_make_dir(root_inode, dentry, &sel_last_ino); if (ret) @@ -1877,11 +1852,10 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent) if (ret) goto err; + ret = -ENOMEM; dentry = d_alloc_name(sb->s_root, "class"); - if (!dentry) { - ret = -ENOMEM; + if (!dentry) goto err; - } ret = sel_make_dir(root_inode, dentry, &sel_last_ino); if (ret) @@ -1889,11 +1863,10 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent) class_dir = dentry; + ret = -ENOMEM; dentry = d_alloc_name(sb->s_root, "policy_capabilities"); - if (!dentry) { - ret = -ENOMEM; + if (!dentry) goto err; - } ret = sel_make_dir(root_inode, dentry, &sel_last_ino); if (ret) @@ -1901,12 +1874,11 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent) policycap_dir = dentry; -out: - return ret; + return 0; err: printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", __func__); - goto out; + return ret; } static struct dentry *sel_mount(struct file_system_type *fs_type, @@ -1930,14 +1902,16 @@ static int __init init_sel_fs(void) if (!selinux_enabled) return 0; err = register_filesystem(&sel_fs_type); - if (!err) { - selinuxfs_mount = kern_mount(&sel_fs_type); - if (IS_ERR(selinuxfs_mount)) { - printk(KERN_ERR "selinuxfs: could not mount!\n"); - err = PTR_ERR(selinuxfs_mount); - selinuxfs_mount = NULL; - } + if (err) + return err; + + selinuxfs_mount = kern_mount(&sel_fs_type); + if (IS_ERR(selinuxfs_mount)) { + printk(KERN_ERR "selinuxfs: could not mount!\n"); + err = PTR_ERR(selinuxfs_mount); + selinuxfs_mount = NULL; } + return err; } -- cgit v1.2.3 From 4b02b524487622ce1cf472123899520b583f47dc Mon Sep 17 00:00:00 2001 From: Eric Paris Date: Tue, 23 Nov 2010 11:40:08 -0500 Subject: SELinux: standardize return code handling in selinuxfs.c selinuxfs.c has lots of different standards on how to handle return paths on error. For the most part transition to rc=errno if (failure) goto out; [...] out: cleanup() return rc; Instead of doing cleanup mid function, or having multiple returns or other options. This doesn't do that for every function, but most of the complex functions which have cleanup routines on error. Signed-off-by: Eric Paris --- security/selinux/ss/services.c | 328 ++++++++++++++++++++--------------------- 1 file changed, 157 insertions(+), 171 deletions(-) (limited to 'security') diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index 223c1ff6ef23..84e2a98d7cc5 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -701,11 +701,11 @@ static int security_validtrans_handle_fail(struct context *ocontext, char *o = NULL, *n = NULL, *t = NULL; u32 olen, nlen, tlen; - if (context_struct_to_string(ocontext, &o, &olen) < 0) + if (context_struct_to_string(ocontext, &o, &olen)) goto out; - if (context_struct_to_string(ncontext, &n, &nlen) < 0) + if (context_struct_to_string(ncontext, &n, &nlen)) goto out; - if (context_struct_to_string(tcontext, &t, &tlen) < 0) + if (context_struct_to_string(tcontext, &t, &tlen)) goto out; audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, "security_validate_transition: denied for" @@ -801,10 +801,11 @@ int security_bounded_transition(u32 old_sid, u32 new_sid) struct context *old_context, *new_context; struct type_datum *type; int index; - int rc = -EINVAL; + int rc; read_lock(&policy_rwlock); + rc = -EINVAL; old_context = sidtab_search(&sidtab, old_sid); if (!old_context) { printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", @@ -812,6 +813,7 @@ int security_bounded_transition(u32 old_sid, u32 new_sid) goto out; } + rc = -EINVAL; new_context = sidtab_search(&sidtab, new_sid); if (!new_context) { printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", @@ -819,11 +821,10 @@ int security_bounded_transition(u32 old_sid, u32 new_sid) goto out; } + rc = 0; /* type/domain unchanged */ - if (old_context->type == new_context->type) { - rc = 0; + if (old_context->type == new_context->type) goto out; - } index = new_context->type; while (true) { @@ -831,16 +832,15 @@ int security_bounded_transition(u32 old_sid, u32 new_sid) BUG_ON(!type); /* not bounded anymore */ - if (!type->bounds) { - rc = -EPERM; + rc = -EPERM; + if (!type->bounds) break; - } /* @newsid is bounded by @oldsid */ - if (type->bounds == old_context->type) { - rc = 0; + rc = 0; + if (type->bounds == old_context->type) break; - } + index = type->bounds; } @@ -1187,16 +1187,13 @@ static int string_to_context_struct(struct policydb *pol, if (rc) goto out; - if ((p - scontext) < scontext_len) { - rc = -EINVAL; + rc = -EINVAL; + if ((p - scontext) < scontext_len) goto out; - } /* Check the validity of the new context. */ - if (!policydb_context_isvalid(pol, ctx)) { - rc = -EINVAL; + if (!policydb_context_isvalid(pol, ctx)) goto out; - } rc = 0; out: if (rc) @@ -1235,27 +1232,26 @@ static int security_context_to_sid_core(const char *scontext, u32 scontext_len, if (force) { /* Save another copy for storing in uninterpreted form */ + rc = -ENOMEM; str = kstrdup(scontext2, gfp_flags); - if (!str) { - kfree(scontext2); - return -ENOMEM; - } + if (!str) + goto out; } read_lock(&policy_rwlock); - rc = string_to_context_struct(&policydb, &sidtab, - scontext2, scontext_len, - &context, def_sid); + rc = string_to_context_struct(&policydb, &sidtab, scontext2, + scontext_len, &context, def_sid); if (rc == -EINVAL && force) { context.str = str; context.len = scontext_len; str = NULL; } else if (rc) - goto out; + goto out_unlock; rc = sidtab_context_to_sid(&sidtab, &context, sid); context_destroy(&context); -out: +out_unlock: read_unlock(&policy_rwlock); +out: kfree(scontext2); kfree(str); return rc; @@ -1319,11 +1315,11 @@ static int compute_sid_handle_invalid_context( char *s = NULL, *t = NULL, *n = NULL; u32 slen, tlen, nlen; - if (context_struct_to_string(scontext, &s, &slen) < 0) + if (context_struct_to_string(scontext, &s, &slen)) goto out; - if (context_struct_to_string(tcontext, &t, &tlen) < 0) + if (context_struct_to_string(tcontext, &t, &tlen)) goto out; - if (context_struct_to_string(newcontext, &n, &nlen) < 0) + if (context_struct_to_string(newcontext, &n, &nlen)) goto out; audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, "security_compute_sid: invalid context %s" @@ -1569,22 +1565,17 @@ static int clone_sid(u32 sid, static inline int convert_context_handle_invalid_context(struct context *context) { - int rc = 0; + char *s; + u32 len; - if (selinux_enforcing) { - rc = -EINVAL; - } else { - char *s; - u32 len; - - if (!context_struct_to_string(context, &s, &len)) { - printk(KERN_WARNING - "SELinux: Context %s would be invalid if enforcing\n", - s); - kfree(s); - } + if (selinux_enforcing) + return -EINVAL; + + if (!context_struct_to_string(context, &s, &len)) { + printk(KERN_WARNING "SELinux: Context %s would be invalid if enforcing\n", s); + kfree(s); } - return rc; + return 0; } struct convert_context_args { @@ -1621,17 +1612,17 @@ static int convert_context(u32 key, if (c->str) { struct context ctx; + + rc = -ENOMEM; s = kstrdup(c->str, GFP_KERNEL); - if (!s) { - rc = -ENOMEM; + if (!s) goto out; - } + rc = string_to_context_struct(args->newp, NULL, s, c->len, &ctx, SECSID_NULL); kfree(s); if (!rc) { - printk(KERN_INFO - "SELinux: Context %s became valid (mapped).\n", + printk(KERN_INFO "SELinux: Context %s became valid (mapped).\n", c->str); /* Replace string with mapped representation. */ kfree(c->str); @@ -1643,8 +1634,7 @@ static int convert_context(u32 key, goto out; } else { /* Other error condition, e.g. ENOMEM. */ - printk(KERN_ERR - "SELinux: Unable to map context %s, rc = %d.\n", + printk(KERN_ERR "SELinux: Unable to map context %s, rc = %d.\n", c->str, -rc); goto out; } @@ -1654,9 +1644,8 @@ static int convert_context(u32 key, if (rc) goto out; - rc = -EINVAL; - /* Convert the user. */ + rc = -EINVAL; usrdatum = hashtab_search(args->newp->p_users.table, args->oldp->p_user_val_to_name[c->user - 1]); if (!usrdatum) @@ -1664,6 +1653,7 @@ static int convert_context(u32 key, c->user = usrdatum->value; /* Convert the role. */ + rc = -EINVAL; role = hashtab_search(args->newp->p_roles.table, args->oldp->p_role_val_to_name[c->role - 1]); if (!role) @@ -1671,6 +1661,7 @@ static int convert_context(u32 key, c->role = role->value; /* Convert the type. */ + rc = -EINVAL; typdatum = hashtab_search(args->newp->p_types.table, args->oldp->p_type_val_to_name[c->type - 1]); if (!typdatum) @@ -1700,6 +1691,7 @@ static int convert_context(u32 key, oc = args->newp->ocontexts[OCON_ISID]; while (oc && oc->sid[0] != SECINITSID_UNLABELED) oc = oc->next; + rc = -EINVAL; if (!oc) { printk(KERN_ERR "SELinux: unable to look up" " the initial SIDs list\n"); @@ -1719,19 +1711,20 @@ static int convert_context(u32 key, } context_destroy(&oldc); + rc = 0; out: return rc; bad: /* Map old representation to string and save it. */ - if (context_struct_to_string(&oldc, &s, &len)) - return -ENOMEM; + rc = context_struct_to_string(&oldc, &s, &len); + if (rc) + return rc; context_destroy(&oldc); context_destroy(c); c->str = s; c->len = len; - printk(KERN_INFO - "SELinux: Context %s became invalid (unmapped).\n", + printk(KERN_INFO "SELinux: Context %s became invalid (unmapped).\n", c->str); rc = 0; goto out; @@ -2012,7 +2005,7 @@ int security_node_sid(u16 domain, u32 addrlen, u32 *out_sid) { - int rc = 0; + int rc; struct ocontext *c; read_lock(&policy_rwlock); @@ -2021,10 +2014,9 @@ int security_node_sid(u16 domain, case AF_INET: { u32 addr; - if (addrlen != sizeof(u32)) { - rc = -EINVAL; + rc = -EINVAL; + if (addrlen != sizeof(u32)) goto out; - } addr = *((u32 *)addrp); @@ -2038,10 +2030,9 @@ int security_node_sid(u16 domain, } case AF_INET6: - if (addrlen != sizeof(u64) * 2) { - rc = -EINVAL; + rc = -EINVAL; + if (addrlen != sizeof(u64) * 2) goto out; - } c = policydb.ocontexts[OCON_NODE6]; while (c) { if (match_ipv6_addrmask(addrp, c->u.node6.addr, @@ -2052,6 +2043,7 @@ int security_node_sid(u16 domain, break; default: + rc = 0; *out_sid = SECINITSID_NODE; goto out; } @@ -2069,6 +2061,7 @@ int security_node_sid(u16 domain, *out_sid = SECINITSID_NODE; } + rc = 0; out: read_unlock(&policy_rwlock); return rc; @@ -2113,24 +2106,22 @@ int security_get_user_sids(u32 fromsid, context_init(&usercon); + rc = -EINVAL; fromcon = sidtab_search(&sidtab, fromsid); - if (!fromcon) { - rc = -EINVAL; + if (!fromcon) goto out_unlock; - } + rc = -EINVAL; user = hashtab_search(policydb.p_users.table, username); - if (!user) { - rc = -EINVAL; + if (!user) goto out_unlock; - } + usercon.user = user->value; + rc = -ENOMEM; mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); - if (!mysids) { - rc = -ENOMEM; + if (!mysids) goto out_unlock; - } ebitmap_for_each_positive_bit(&user->roles, rnode, i) { role = policydb.role_val_to_struct[i]; @@ -2147,12 +2138,11 @@ int security_get_user_sids(u32 fromsid, if (mynel < maxnel) { mysids[mynel++] = sid; } else { + rc = -ENOMEM; maxnel += SIDS_NEL; mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); - if (!mysids2) { - rc = -ENOMEM; + if (!mysids2) goto out_unlock; - } memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); kfree(mysids); mysids = mysids2; @@ -2160,7 +2150,7 @@ int security_get_user_sids(u32 fromsid, } } } - + rc = 0; out_unlock: read_unlock(&policy_rwlock); if (rc || !mynel) { @@ -2168,9 +2158,9 @@ out_unlock: goto out; } + rc = -ENOMEM; mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL); if (!mysids2) { - rc = -ENOMEM; kfree(mysids); goto out; } @@ -2211,7 +2201,7 @@ int security_genfs_sid(const char *fstype, u16 sclass; struct genfs *genfs; struct ocontext *c; - int rc = 0, cmp = 0; + int rc, cmp = 0; while (path[0] == '/' && path[1] == '/') path++; @@ -2219,6 +2209,7 @@ int security_genfs_sid(const char *fstype, read_lock(&policy_rwlock); sclass = unmap_class(orig_sclass); + *sid = SECINITSID_UNLABELED; for (genfs = policydb.genfs; genfs; genfs = genfs->next) { cmp = strcmp(fstype, genfs->fstype); @@ -2226,11 +2217,9 @@ int security_genfs_sid(const char *fstype, break; } - if (!genfs || cmp) { - *sid = SECINITSID_UNLABELED; - rc = -ENOENT; + rc = -ENOENT; + if (!genfs || cmp) goto out; - } for (c = genfs->head; c; c = c->next) { len = strlen(c->u.name); @@ -2239,21 +2228,18 @@ int security_genfs_sid(const char *fstype, break; } - if (!c) { - *sid = SECINITSID_UNLABELED; - rc = -ENOENT; + rc = -ENOENT; + if (!c) goto out; - } if (!c->sid[0]) { - rc = sidtab_context_to_sid(&sidtab, - &c->context[0], - &c->sid[0]); + rc = sidtab_context_to_sid(&sidtab, &c->context[0], &c->sid[0]); if (rc) goto out; } *sid = c->sid[0]; + rc = 0; out: read_unlock(&policy_rwlock); return rc; @@ -2285,8 +2271,7 @@ int security_fs_use( if (c) { *behavior = c->v.behavior; if (!c->sid[0]) { - rc = sidtab_context_to_sid(&sidtab, - &c->context[0], + rc = sidtab_context_to_sid(&sidtab, &c->context[0], &c->sid[0]); if (rc) goto out; @@ -2309,33 +2294,38 @@ out: int security_get_bools(int *len, char ***names, int **values) { - int i, rc = -ENOMEM; + int i, rc; read_lock(&policy_rwlock); *names = NULL; *values = NULL; + rc = 0; *len = policydb.p_bools.nprim; - if (!*len) { - rc = 0; + if (!*len) goto out; - } - *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC); + rc = -ENOMEM; + *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC); if (!*names) goto err; - *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); + rc = -ENOMEM; + *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); if (!*values) goto err; for (i = 0; i < *len; i++) { size_t name_len; + (*values)[i] = policydb.bool_val_to_struct[i]->state; name_len = strlen(policydb.p_bool_val_to_name[i]) + 1; - (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC); + + rc = -ENOMEM; + (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC); if (!(*names)[i]) goto err; + strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len); (*names)[i][name_len - 1] = 0; } @@ -2355,17 +2345,16 @@ err: int security_set_bools(int len, int *values) { - int i, rc = 0; + int i, rc; int lenp, seqno = 0; struct cond_node *cur; write_lock_irq(&policy_rwlock); + rc = -EFAULT; lenp = policydb.p_bools.nprim; - if (len != lenp) { - rc = -EFAULT; + if (len != lenp) goto out; - } for (i = 0; i < len; i++) { if (!!values[i] != policydb.bool_val_to_struct[i]->state) { @@ -2391,7 +2380,7 @@ int security_set_bools(int len, int *values) } seqno = ++latest_granting; - + rc = 0; out: write_unlock_irq(&policy_rwlock); if (!rc) { @@ -2405,16 +2394,15 @@ out: int security_get_bool_value(int bool) { - int rc = 0; + int rc; int len; read_lock(&policy_rwlock); + rc = -EFAULT; len = policydb.p_bools.nprim; - if (bool >= len) { - rc = -EFAULT; + if (bool >= len) goto out; - } rc = policydb.bool_val_to_struct[bool]->state; out: @@ -2464,8 +2452,9 @@ int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) struct context newcon; char *s; u32 len; - int rc = 0; + int rc; + rc = 0; if (!ss_initialized || !policydb.mls_enabled) { *new_sid = sid; goto out; @@ -2474,19 +2463,20 @@ int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) context_init(&newcon); read_lock(&policy_rwlock); + + rc = -EINVAL; context1 = sidtab_search(&sidtab, sid); if (!context1) { printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", __func__, sid); - rc = -EINVAL; goto out_unlock; } + rc = -EINVAL; context2 = sidtab_search(&sidtab, mls_sid); if (!context2) { printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", __func__, mls_sid); - rc = -EINVAL; goto out_unlock; } @@ -2500,20 +2490,17 @@ int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) /* Check the validity of the new context. */ if (!policydb_context_isvalid(&policydb, &newcon)) { rc = convert_context_handle_invalid_context(&newcon); - if (rc) - goto bad; + if (rc) { + if (!context_struct_to_string(&newcon, &s, &len)) { + audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, + "security_sid_mls_copy: invalid context %s", s); + kfree(s); + } + goto out_unlock; + } } rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid); - goto out_unlock; - -bad: - if (!context_struct_to_string(&newcon, &s, &len)) { - audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, - "security_sid_mls_copy: invalid context %s", s); - kfree(s); - } - out_unlock: read_unlock(&policy_rwlock); context_destroy(&newcon); @@ -2549,6 +2536,8 @@ int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, struct context *nlbl_ctx; struct context *xfrm_ctx; + *peer_sid = SECSID_NULL; + /* handle the common (which also happens to be the set of easy) cases * right away, these two if statements catch everything involving a * single or absent peer SID/label */ @@ -2567,40 +2556,37 @@ int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, /* we don't need to check ss_initialized here since the only way both * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the * security server was initialized and ss_initialized was true */ - if (!policydb.mls_enabled) { - *peer_sid = SECSID_NULL; + if (!policydb.mls_enabled) return 0; - } read_lock(&policy_rwlock); + rc = -EINVAL; nlbl_ctx = sidtab_search(&sidtab, nlbl_sid); if (!nlbl_ctx) { printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", __func__, nlbl_sid); - rc = -EINVAL; - goto out_slowpath; + goto out; } + rc = -EINVAL; xfrm_ctx = sidtab_search(&sidtab, xfrm_sid); if (!xfrm_ctx) { printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", __func__, xfrm_sid); - rc = -EINVAL; - goto out_slowpath; + goto out; } rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES); + if (rc) + goto out; -out_slowpath: + /* at present NetLabel SIDs/labels really only carry MLS + * information so if the MLS portion of the NetLabel SID + * matches the MLS portion of the labeled XFRM SID/label + * then pass along the XFRM SID as it is the most + * expressive */ + *peer_sid = xfrm_sid; +out: read_unlock(&policy_rwlock); - if (rc == 0) - /* at present NetLabel SIDs/labels really only carry MLS - * information so if the MLS portion of the NetLabel SID - * matches the MLS portion of the labeled XFRM SID/label - * then pass along the XFRM SID as it is the most - * expressive */ - *peer_sid = xfrm_sid; - else - *peer_sid = SECSID_NULL; return rc; } @@ -2619,10 +2605,11 @@ static int get_classes_callback(void *k, void *d, void *args) int security_get_classes(char ***classes, int *nclasses) { - int rc = -ENOMEM; + int rc; read_lock(&policy_rwlock); + rc = -ENOMEM; *nclasses = policydb.p_classes.nprim; *classes = kcalloc(*nclasses, sizeof(**classes), GFP_ATOMIC); if (!*classes) @@ -2630,7 +2617,7 @@ int security_get_classes(char ***classes, int *nclasses) rc = hashtab_map(policydb.p_classes.table, get_classes_callback, *classes); - if (rc < 0) { + if (rc) { int i; for (i = 0; i < *nclasses; i++) kfree((*classes)[i]); @@ -2657,19 +2644,20 @@ static int get_permissions_callback(void *k, void *d, void *args) int security_get_permissions(char *class, char ***perms, int *nperms) { - int rc = -ENOMEM, i; + int rc, i; struct class_datum *match; read_lock(&policy_rwlock); + rc = -EINVAL; match = hashtab_search(policydb.p_classes.table, class); if (!match) { printk(KERN_ERR "SELinux: %s: unrecognized class %s\n", __func__, class); - rc = -EINVAL; goto out; } + rc = -ENOMEM; *nperms = match->permissions.nprim; *perms = kcalloc(*nperms, sizeof(**perms), GFP_ATOMIC); if (!*perms) @@ -2678,13 +2666,13 @@ int security_get_permissions(char *class, char ***perms, int *nperms) if (match->comdatum) { rc = hashtab_map(match->comdatum->permissions.table, get_permissions_callback, *perms); - if (rc < 0) + if (rc) goto err; } rc = hashtab_map(match->permissions.table, get_permissions_callback, *perms); - if (rc < 0) + if (rc) goto err; out: @@ -2796,36 +2784,39 @@ int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) switch (field) { case AUDIT_SUBJ_USER: case AUDIT_OBJ_USER: + rc = -EINVAL; userdatum = hashtab_search(policydb.p_users.table, rulestr); if (!userdatum) - rc = -EINVAL; - else - tmprule->au_ctxt.user = userdatum->value; + goto out; + tmprule->au_ctxt.user = userdatum->value; break; case AUDIT_SUBJ_ROLE: case AUDIT_OBJ_ROLE: + rc = -EINVAL; roledatum = hashtab_search(policydb.p_roles.table, rulestr); if (!roledatum) - rc = -EINVAL; - else - tmprule->au_ctxt.role = roledatum->value; + goto out; + tmprule->au_ctxt.role = roledatum->value; break; case AUDIT_SUBJ_TYPE: case AUDIT_OBJ_TYPE: + rc = -EINVAL; typedatum = hashtab_search(policydb.p_types.table, rulestr); if (!typedatum) - rc = -EINVAL; - else - tmprule->au_ctxt.type = typedatum->value; + goto out; + tmprule->au_ctxt.type = typedatum->value; break; case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: case AUDIT_OBJ_LEV_LOW: case AUDIT_OBJ_LEV_HIGH: rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC); + if (rc) + goto out; break; } - + rc = 0; +out: read_unlock(&policy_rwlock); if (rc) { @@ -3127,28 +3118,23 @@ int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) return 0; read_lock(&policy_rwlock); + + rc = -ENOENT; ctx = sidtab_search(&sidtab, sid); - if (ctx == NULL) { - rc = -ENOENT; - goto netlbl_sid_to_secattr_failure; - } + if (ctx == NULL) + goto out; + + rc = -ENOMEM; secattr->domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1], GFP_ATOMIC); - if (secattr->domain == NULL) { - rc = -ENOMEM; - goto netlbl_sid_to_secattr_failure; - } + if (secattr->domain == NULL) + goto out; + secattr->attr.secid = sid; secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY | NETLBL_SECATTR_SECID; mls_export_netlbl_lvl(ctx, secattr); rc = mls_export_netlbl_cat(ctx, secattr); - if (rc != 0) - goto netlbl_sid_to_secattr_failure; - read_unlock(&policy_rwlock); - - return 0; - -netlbl_sid_to_secattr_failure: +out: read_unlock(&policy_rwlock); return rc; } -- cgit v1.2.3 From 7ae9f23cbd3ef9daff7f768da4bfd4c56b19300d Mon Sep 17 00:00:00 2001 From: Eric Paris Date: Tue, 23 Nov 2010 11:40:09 -0500 Subject: selinux: rework security_netlbl_secattr_to_sid security_netlbl_secattr_to_sid is difficult to follow, especially the return codes. Try to make the function obvious. Signed-off-by: Eric Paris --- security/selinux/ss/services.c | 42 +++++++++++++++++++++--------------------- 1 file changed, 21 insertions(+), 21 deletions(-) (limited to 'security') diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index 84e2a98d7cc5..ab6dbce5fd2a 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -3041,7 +3041,7 @@ static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, u32 *sid) { - int rc = -EIDRM; + int rc; struct context *ctx; struct context ctx_new; @@ -3052,16 +3052,15 @@ int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, read_lock(&policy_rwlock); - if (secattr->flags & NETLBL_SECATTR_CACHE) { + if (secattr->flags & NETLBL_SECATTR_CACHE) *sid = *(u32 *)secattr->cache->data; - rc = 0; - } else if (secattr->flags & NETLBL_SECATTR_SECID) { + else if (secattr->flags & NETLBL_SECATTR_SECID) *sid = secattr->attr.secid; - rc = 0; - } else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { + else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { + rc = -EIDRM; ctx = sidtab_search(&sidtab, SECINITSID_NETMSG); if (ctx == NULL) - goto netlbl_secattr_to_sid_return; + goto out; context_init(&ctx_new); ctx_new.user = ctx->user; @@ -3069,34 +3068,35 @@ int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, ctx_new.type = ctx->type; mls_import_netlbl_lvl(&ctx_new, secattr); if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { - if (ebitmap_netlbl_import(&ctx_new.range.level[0].cat, - secattr->attr.mls.cat) != 0) - goto netlbl_secattr_to_sid_return; + rc = ebitmap_netlbl_import(&ctx_new.range.level[0].cat, + secattr->attr.mls.cat); + if (rc) + goto out; memcpy(&ctx_new.range.level[1].cat, &ctx_new.range.level[0].cat, sizeof(ctx_new.range.level[0].cat)); } - if (mls_context_isvalid(&policydb, &ctx_new) != 1) - goto netlbl_secattr_to_sid_return_cleanup; + rc = -EIDRM; + if (!mls_context_isvalid(&policydb, &ctx_new)) + goto out_free; rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); - if (rc != 0) - goto netlbl_secattr_to_sid_return_cleanup; + if (rc) + goto out_free; security_netlbl_cache_add(secattr, *sid); ebitmap_destroy(&ctx_new.range.level[0].cat); - } else { + } else *sid = SECSID_NULL; - rc = 0; - } -netlbl_secattr_to_sid_return: read_unlock(&policy_rwlock); - return rc; -netlbl_secattr_to_sid_return_cleanup: + return 0; +out_free: ebitmap_destroy(&ctx_new.range.level[0].cat); - goto netlbl_secattr_to_sid_return; +out: + read_unlock(&policy_rwlock); + return rc; } /** -- cgit v1.2.3 From c9e86a9b95f198d7df49b25fcd808ee39cba218f Mon Sep 17 00:00:00 2001 From: Eric Paris Date: Mon, 29 Nov 2010 15:46:39 -0500 Subject: SELinux: do not set automatic i_ino in selinuxfs selinuxfs carefully uses i_ino to figure out what the inode refers to. The VFS used to generically set this value and we would reset it to something useable. After 85fe4025c616 each filesystem sets this value to a default if needed. Since selinuxfs doesn't use the default value and it can only lead to problems (I'd rather have 2 inodes with i_ino == 0 than one pointing to the wrong data) lets just stop setting a default. Signed-off-by: Eric Paris Acked-by: James Morris --- security/selinux/selinuxfs.c | 1 - 1 file changed, 1 deletion(-) (limited to 'security') diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c index 8bae68e21af9..45d35e629fc6 100644 --- a/security/selinux/selinuxfs.c +++ b/security/selinux/selinuxfs.c @@ -989,7 +989,6 @@ static struct inode *sel_make_inode(struct super_block *sb, int mode) struct inode *ret = new_inode(sb); if (ret) { - ret->i_ino = get_next_ino(); ret->i_mode = mode; ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; } -- cgit v1.2.3 From 23bdecb000c806cf4ec52764499a600f7200d7a9 Mon Sep 17 00:00:00 2001 From: Eric Paris Date: Mon, 29 Nov 2010 15:47:09 -0500 Subject: selinux: convert type_val_to_struct to flex_array In rawhide type_val_to_struct will allocate 26848 bytes, an order 3 allocations. While this hasn't been seen to fail it isn't outside the realm of possibiliy on systems with severe memory fragmentation. Convert to flex_array so no allocation will ever be bigger than PAGE_SIZE. Signed-off-by: Eric Paris --- security/selinux/ss/policydb.c | 28 +++++++++++++++++++++------- security/selinux/ss/policydb.h | 2 +- security/selinux/ss/services.c | 17 ++++++++++++----- 3 files changed, 34 insertions(+), 13 deletions(-) (limited to 'security') diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c index 6ad73e81da5c..af41fdfe1a71 100644 --- a/security/selinux/ss/policydb.c +++ b/security/selinux/ss/policydb.c @@ -307,7 +307,11 @@ static int type_index(void *key, void *datum, void *datap) || typdatum->bounds > p->p_types.nprim) return -EINVAL; p->p_type_val_to_name[typdatum->value - 1] = key; - p->type_val_to_struct[typdatum->value - 1] = typdatum; + /* this flex array was all preallocated, this cannot fail */ + if (flex_array_put_ptr(p->type_val_to_struct_array, + typdatum->value - 1, typdatum, + GFP_KERNEL | __GFP_ZERO)) + BUG(); } return 0; @@ -484,11 +488,17 @@ static int policydb_index_others(struct policydb *p) if (!p->user_val_to_struct) goto out; + /* Yes, I want the sizeof the pointer, not the structure */ rc = -ENOMEM; - p->type_val_to_struct = - kmalloc(p->p_types.nprim * sizeof(*(p->type_val_to_struct)), - GFP_KERNEL); - if (!p->type_val_to_struct) + p->type_val_to_struct_array = flex_array_alloc(sizeof(struct type_datum *), + p->p_types.nprim, + GFP_KERNEL | __GFP_ZERO); + if (!p->type_val_to_struct_array) + goto out; + + rc = flex_array_prealloc(p->type_val_to_struct_array, 0, + p->p_types.nprim - 1, GFP_KERNEL | __GFP_ZERO); + if (rc) goto out; rc = -ENOMEM; @@ -699,7 +709,8 @@ void policydb_destroy(struct policydb *p) kfree(p->class_val_to_struct); kfree(p->role_val_to_struct); kfree(p->user_val_to_struct); - kfree(p->type_val_to_struct); + if (p->type_val_to_struct_array) + flex_array_free(p->type_val_to_struct_array); avtab_destroy(&p->te_avtab); @@ -1618,7 +1629,10 @@ static int type_bounds_sanity_check(void *key, void *datum, void *datap) return -EINVAL; } - upper = p->type_val_to_struct[upper->bounds - 1]; + upper = flex_array_get_ptr(p->type_val_to_struct_array, + upper->bounds - 1); + BUG_ON(!upper); + if (upper->attribute) { printk(KERN_ERR "SELinux: type %s: " "bounded by attribute %s", diff --git a/security/selinux/ss/policydb.h b/security/selinux/ss/policydb.h index 95d3d7de361e..9826a92a6b0c 100644 --- a/security/selinux/ss/policydb.h +++ b/security/selinux/ss/policydb.h @@ -217,7 +217,7 @@ struct policydb { struct class_datum **class_val_to_struct; struct role_datum **role_val_to_struct; struct user_datum **user_val_to_struct; - struct type_datum **type_val_to_struct; + struct flex_array *type_val_to_struct_array; /* type enforcement access vectors and transitions */ struct avtab te_avtab; diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index ab6dbce5fd2a..afcbc19817f7 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -530,12 +530,18 @@ static void type_attribute_bounds_av(struct context *scontext, struct context lo_scontext; struct context lo_tcontext; struct av_decision lo_avd; - struct type_datum *source - = policydb.type_val_to_struct[scontext->type - 1]; - struct type_datum *target - = policydb.type_val_to_struct[tcontext->type - 1]; + struct type_datum *source; + struct type_datum *target; u32 masked = 0; + source = flex_array_get_ptr(policydb.type_val_to_struct_array, + scontext->type - 1); + BUG_ON(!source); + + target = flex_array_get_ptr(policydb.type_val_to_struct_array, + tcontext->type - 1); + BUG_ON(!target); + if (source->bounds) { memset(&lo_avd, 0, sizeof(lo_avd)); @@ -828,7 +834,8 @@ int security_bounded_transition(u32 old_sid, u32 new_sid) index = new_context->type; while (true) { - type = policydb.type_val_to_struct[index - 1]; + type = flex_array_get_ptr(policydb.type_val_to_struct_array, + index - 1); BUG_ON(!type); /* not bounded anymore */ -- cgit v1.2.3 From ac76c05becb6beedbb458d0827d3deaa6f479a72 Mon Sep 17 00:00:00 2001 From: Eric Paris Date: Mon, 29 Nov 2010 15:47:09 -0500 Subject: selinux: convert part of the sym_val_to_name array to use flex_array The sym_val_to_name type array can be quite large as it grows linearly with the number of types. With known policies having over 5k types these allocations are growing large enough that they are likely to fail. Convert those to flex_array so no allocation is larger than PAGE_SIZE Signed-off-by: Eric Paris --- security/selinux/ss/conditional.c | 6 ++- security/selinux/ss/mls.c | 25 ++++----- security/selinux/ss/policydb.c | 109 ++++++++++++++++++++++++++++---------- security/selinux/ss/policydb.h | 17 +++--- security/selinux/ss/services.c | 38 ++++++------- 5 files changed, 127 insertions(+), 68 deletions(-) (limited to 'security') diff --git a/security/selinux/ss/conditional.c b/security/selinux/ss/conditional.c index 655fe1c6cc69..c3f845cbcd48 100644 --- a/security/selinux/ss/conditional.c +++ b/security/selinux/ss/conditional.c @@ -193,6 +193,7 @@ int cond_index_bool(void *key, void *datum, void *datap) { struct policydb *p; struct cond_bool_datum *booldatum; + struct flex_array *fa; booldatum = datum; p = datap; @@ -200,7 +201,10 @@ int cond_index_bool(void *key, void *datum, void *datap) if (!booldatum->value || booldatum->value > p->p_bools.nprim) return -EINVAL; - p->p_bool_val_to_name[booldatum->value - 1] = key; + fa = p->sym_val_to_name[SYM_BOOLS]; + if (flex_array_put_ptr(fa, booldatum->value - 1, key, + GFP_KERNEL | __GFP_ZERO)) + BUG(); p->bool_val_to_struct[booldatum->value - 1] = booldatum; return 0; diff --git a/security/selinux/ss/mls.c b/security/selinux/ss/mls.c index b4eff7a60c50..1ef8e4e89880 100644 --- a/security/selinux/ss/mls.c +++ b/security/selinux/ss/mls.c @@ -45,7 +45,7 @@ int mls_compute_context_len(struct context *context) len = 1; /* for the beginning ":" */ for (l = 0; l < 2; l++) { int index_sens = context->range.level[l].sens; - len += strlen(policydb.p_sens_val_to_name[index_sens - 1]); + len += strlen(sym_name(&policydb, SYM_LEVELS, index_sens - 1)); /* categories */ head = -2; @@ -55,17 +55,17 @@ int mls_compute_context_len(struct context *context) if (i - prev > 1) { /* one or more negative bits are skipped */ if (head != prev) { - nm = policydb.p_cat_val_to_name[prev]; + nm = sym_name(&policydb, SYM_CATS, prev); len += strlen(nm) + 1; } - nm = policydb.p_cat_val_to_name[i]; + nm = sym_name(&policydb, SYM_CATS, i); len += strlen(nm) + 1; head = i; } prev = i; } if (prev != head) { - nm = policydb.p_cat_val_to_name[prev]; + nm = sym_name(&policydb, SYM_CATS, prev); len += strlen(nm) + 1; } if (l == 0) { @@ -102,8 +102,8 @@ void mls_sid_to_context(struct context *context, scontextp++; for (l = 0; l < 2; l++) { - strcpy(scontextp, - policydb.p_sens_val_to_name[context->range.level[l].sens - 1]); + strcpy(scontextp, sym_name(&policydb, SYM_LEVELS, + context->range.level[l].sens - 1)); scontextp += strlen(scontextp); /* categories */ @@ -118,7 +118,7 @@ void mls_sid_to_context(struct context *context, *scontextp++ = '.'; else *scontextp++ = ','; - nm = policydb.p_cat_val_to_name[prev]; + nm = sym_name(&policydb, SYM_CATS, prev); strcpy(scontextp, nm); scontextp += strlen(nm); } @@ -126,7 +126,7 @@ void mls_sid_to_context(struct context *context, *scontextp++ = ':'; else *scontextp++ = ','; - nm = policydb.p_cat_val_to_name[i]; + nm = sym_name(&policydb, SYM_CATS, i); strcpy(scontextp, nm); scontextp += strlen(nm); head = i; @@ -139,7 +139,7 @@ void mls_sid_to_context(struct context *context, *scontextp++ = '.'; else *scontextp++ = ','; - nm = policydb.p_cat_val_to_name[prev]; + nm = sym_name(&policydb, SYM_CATS, prev); strcpy(scontextp, nm); scontextp += strlen(nm); } @@ -166,7 +166,7 @@ int mls_level_isvalid(struct policydb *p, struct mls_level *l) if (!l->sens || l->sens > p->p_levels.nprim) return 0; levdatum = hashtab_search(p->p_levels.table, - p->p_sens_val_to_name[l->sens - 1]); + sym_name(p, SYM_LEVELS, l->sens - 1)); if (!levdatum) return 0; @@ -482,7 +482,8 @@ int mls_convert_context(struct policydb *oldp, for (l = 0; l < 2; l++) { levdatum = hashtab_search(newp->p_levels.table, - oldp->p_sens_val_to_name[c->range.level[l].sens - 1]); + sym_name(oldp, SYM_LEVELS, + c->range.level[l].sens - 1)); if (!levdatum) return -EINVAL; @@ -493,7 +494,7 @@ int mls_convert_context(struct policydb *oldp, int rc; catdatum = hashtab_search(newp->p_cats.table, - oldp->p_cat_val_to_name[i]); + sym_name(oldp, SYM_CATS, i)); if (!catdatum) return -EINVAL; rc = ebitmap_set_bit(&bitmap, catdatum->value - 1, 1); diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c index af41fdfe1a71..5adca670e5af 100644 --- a/security/selinux/ss/policydb.c +++ b/security/selinux/ss/policydb.c @@ -254,12 +254,17 @@ static int common_index(void *key, void *datum, void *datap) { struct policydb *p; struct common_datum *comdatum; + struct flex_array *fa; comdatum = datum; p = datap; if (!comdatum->value || comdatum->value > p->p_commons.nprim) return -EINVAL; - p->p_common_val_to_name[comdatum->value - 1] = key; + + fa = p->sym_val_to_name[SYM_COMMONS]; + if (flex_array_put_ptr(fa, comdatum->value - 1, key, + GFP_KERNEL | __GFP_ZERO)) + BUG(); return 0; } @@ -267,12 +272,16 @@ static int class_index(void *key, void *datum, void *datap) { struct policydb *p; struct class_datum *cladatum; + struct flex_array *fa; cladatum = datum; p = datap; if (!cladatum->value || cladatum->value > p->p_classes.nprim) return -EINVAL; - p->p_class_val_to_name[cladatum->value - 1] = key; + fa = p->sym_val_to_name[SYM_CLASSES]; + if (flex_array_put_ptr(fa, cladatum->value - 1, key, + GFP_KERNEL | __GFP_ZERO)) + BUG(); p->class_val_to_struct[cladatum->value - 1] = cladatum; return 0; } @@ -281,6 +290,7 @@ static int role_index(void *key, void *datum, void *datap) { struct policydb *p; struct role_datum *role; + struct flex_array *fa; role = datum; p = datap; @@ -288,7 +298,11 @@ static int role_index(void *key, void *datum, void *datap) || role->value > p->p_roles.nprim || role->bounds > p->p_roles.nprim) return -EINVAL; - p->p_role_val_to_name[role->value - 1] = key; + + fa = p->sym_val_to_name[SYM_ROLES]; + if (flex_array_put_ptr(fa, role->value - 1, key, + GFP_KERNEL | __GFP_ZERO)) + BUG(); p->role_val_to_struct[role->value - 1] = role; return 0; } @@ -297,6 +311,7 @@ static int type_index(void *key, void *datum, void *datap) { struct policydb *p; struct type_datum *typdatum; + struct flex_array *fa; typdatum = datum; p = datap; @@ -306,10 +321,13 @@ static int type_index(void *key, void *datum, void *datap) || typdatum->value > p->p_types.nprim || typdatum->bounds > p->p_types.nprim) return -EINVAL; - p->p_type_val_to_name[typdatum->value - 1] = key; - /* this flex array was all preallocated, this cannot fail */ - if (flex_array_put_ptr(p->type_val_to_struct_array, - typdatum->value - 1, typdatum, + fa = p->sym_val_to_name[SYM_TYPES]; + if (flex_array_put_ptr(fa, typdatum->value - 1, key, + GFP_KERNEL | __GFP_ZERO)) + BUG(); + + fa = p->type_val_to_struct_array; + if (flex_array_put_ptr(fa, typdatum->value - 1, typdatum, GFP_KERNEL | __GFP_ZERO)) BUG(); } @@ -321,6 +339,7 @@ static int user_index(void *key, void *datum, void *datap) { struct policydb *p; struct user_datum *usrdatum; + struct flex_array *fa; usrdatum = datum; p = datap; @@ -328,7 +347,11 @@ static int user_index(void *key, void *datum, void *datap) || usrdatum->value > p->p_users.nprim || usrdatum->bounds > p->p_users.nprim) return -EINVAL; - p->p_user_val_to_name[usrdatum->value - 1] = key; + + fa = p->sym_val_to_name[SYM_USERS]; + if (flex_array_put_ptr(fa, usrdatum->value - 1, key, + GFP_KERNEL | __GFP_ZERO)) + BUG(); p->user_val_to_struct[usrdatum->value - 1] = usrdatum; return 0; } @@ -337,6 +360,7 @@ static int sens_index(void *key, void *datum, void *datap) { struct policydb *p; struct level_datum *levdatum; + struct flex_array *fa; levdatum = datum; p = datap; @@ -345,7 +369,10 @@ static int sens_index(void *key, void *datum, void *datap) if (!levdatum->level->sens || levdatum->level->sens > p->p_levels.nprim) return -EINVAL; - p->p_sens_val_to_name[levdatum->level->sens - 1] = key; + fa = p->sym_val_to_name[SYM_LEVELS]; + if (flex_array_put_ptr(fa, levdatum->level->sens - 1, key, + GFP_KERNEL | __GFP_ZERO)) + BUG(); } return 0; @@ -355,6 +382,7 @@ static int cat_index(void *key, void *datum, void *datap) { struct policydb *p; struct cat_datum *catdatum; + struct flex_array *fa; catdatum = datum; p = datap; @@ -362,7 +390,10 @@ static int cat_index(void *key, void *datum, void *datap) if (!catdatum->isalias) { if (!catdatum->value || catdatum->value > p->p_cats.nprim) return -EINVAL; - p->p_cat_val_to_name[catdatum->value - 1] = key; + fa = p->sym_val_to_name[SYM_CATS]; + if (flex_array_put_ptr(fa, catdatum->value - 1, key, + GFP_KERNEL | __GFP_ZERO)) + BUG(); } return 0; @@ -392,9 +423,16 @@ static int policydb_index_classes(struct policydb *p) int rc; rc = -ENOMEM; - p->p_common_val_to_name = - kmalloc(p->p_commons.nprim * sizeof(char *), GFP_KERNEL); - if (!p->p_common_val_to_name) + p->sym_val_to_name[SYM_COMMONS] = flex_array_alloc(sizeof(char *), + p->p_commons.nprim, + GFP_KERNEL | __GFP_ZERO); + if (!p->sym_val_to_name[SYM_COMMONS]) + goto out; + + rc = flex_array_prealloc(p->sym_val_to_name[SYM_COMMONS], + 0, p->p_commons.nprim - 1, + GFP_KERNEL | __GFP_ZERO); + if (rc) goto out; rc = hashtab_map(p->p_commons.table, common_index, p); @@ -408,9 +446,16 @@ static int policydb_index_classes(struct policydb *p) goto out; rc = -ENOMEM; - p->p_class_val_to_name = - kmalloc(p->p_classes.nprim * sizeof(char *), GFP_KERNEL); - if (!p->p_class_val_to_name) + p->sym_val_to_name[SYM_CLASSES] = flex_array_alloc(sizeof(char *), + p->p_classes.nprim, + GFP_KERNEL | __GFP_ZERO); + if (!p->sym_val_to_name[SYM_CLASSES]) + goto out; + + rc = flex_array_prealloc(p->sym_val_to_name[SYM_CLASSES], + 0, p->p_classes.nprim - 1, + GFP_KERNEL | __GFP_ZERO); + if (rc) goto out; rc = hashtab_map(p->p_classes.table, class_index, p); @@ -507,10 +552,18 @@ static int policydb_index_others(struct policydb *p) for (i = SYM_ROLES; i < SYM_NUM; i++) { rc = -ENOMEM; - p->sym_val_to_name[i] = - kmalloc(p->symtab[i].nprim * sizeof(char *), GFP_KERNEL); + p->sym_val_to_name[i] = flex_array_alloc(sizeof(char *), + p->symtab[i].nprim, + GFP_KERNEL | __GFP_ZERO); if (!p->sym_val_to_name[i]) goto out; + + rc = flex_array_prealloc(p->sym_val_to_name[i], + 0, p->symtab[i].nprim - 1, + GFP_KERNEL | __GFP_ZERO); + if (rc) + goto out; + rc = hashtab_map(p->symtab[i].table, index_f[i], p); if (rc) goto out; @@ -703,8 +756,10 @@ void policydb_destroy(struct policydb *p) hashtab_destroy(p->symtab[i].table); } - for (i = 0; i < SYM_NUM; i++) - kfree(p->sym_val_to_name[i]); + for (i = 0; i < SYM_NUM; i++) { + if (p->sym_val_to_name[i]) + flex_array_free(p->sym_val_to_name[i]); + } kfree(p->class_val_to_struct); kfree(p->role_val_to_struct); @@ -1566,9 +1621,9 @@ static int user_bounds_sanity_check(void *key, void *datum, void *datap) printk(KERN_ERR "SELinux: boundary violated policy: " "user=%s role=%s bounds=%s\n", - p->p_user_val_to_name[user->value - 1], - p->p_role_val_to_name[bit], - p->p_user_val_to_name[upper->value - 1]); + sym_name(p, SYM_USERS, user->value - 1), + sym_name(p, SYM_ROLES, bit), + sym_name(p, SYM_USERS, upper->value - 1)); return -EINVAL; } @@ -1603,9 +1658,9 @@ static int role_bounds_sanity_check(void *key, void *datum, void *datap) printk(KERN_ERR "SELinux: boundary violated policy: " "role=%s type=%s bounds=%s\n", - p->p_role_val_to_name[role->value - 1], - p->p_type_val_to_name[bit], - p->p_role_val_to_name[upper->value - 1]); + sym_name(p, SYM_ROLES, role->value - 1), + sym_name(p, SYM_TYPES, bit), + sym_name(p, SYM_ROLES, upper->value - 1)); return -EINVAL; } @@ -1637,7 +1692,7 @@ static int type_bounds_sanity_check(void *key, void *datum, void *datap) printk(KERN_ERR "SELinux: type %s: " "bounded by attribute %s", (char *) key, - p->p_type_val_to_name[upper->value - 1]); + sym_name(p, SYM_TYPES, upper->value - 1)); return -EINVAL; } } diff --git a/security/selinux/ss/policydb.h b/security/selinux/ss/policydb.h index 9826a92a6b0c..4e3ab9d0b315 100644 --- a/security/selinux/ss/policydb.h +++ b/security/selinux/ss/policydb.h @@ -203,15 +203,7 @@ struct policydb { #define p_cats symtab[SYM_CATS] /* symbol names indexed by (value - 1) */ - char **sym_val_to_name[SYM_NUM]; -#define p_common_val_to_name sym_val_to_name[SYM_COMMONS] -#define p_class_val_to_name sym_val_to_name[SYM_CLASSES] -#define p_role_val_to_name sym_val_to_name[SYM_ROLES] -#define p_type_val_to_name sym_val_to_name[SYM_TYPES] -#define p_user_val_to_name sym_val_to_name[SYM_USERS] -#define p_bool_val_to_name sym_val_to_name[SYM_BOOLS] -#define p_sens_val_to_name sym_val_to_name[SYM_LEVELS] -#define p_cat_val_to_name sym_val_to_name[SYM_CATS] + struct flex_array *sym_val_to_name[SYM_NUM]; /* class, role, and user attributes indexed by (value - 1) */ struct class_datum **class_val_to_struct; @@ -321,6 +313,13 @@ static inline int put_entry(void *buf, size_t bytes, int num, struct policy_file return 0; } +static inline char *sym_name(struct policydb *p, unsigned int sym_num, unsigned int element_nr) +{ + struct flex_array *fa = p->sym_val_to_name[sym_num]; + + return flex_array_get_ptr(fa, element_nr); +} + extern u16 string_to_security_class(struct policydb *p, const char *name); extern u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name); diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index afcbc19817f7..a03cfaf0ee07 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -464,7 +464,7 @@ static void security_dump_masked_av(struct context *scontext, if (!permissions) return; - tclass_name = policydb.p_class_val_to_name[tclass - 1]; + tclass_name = sym_name(&policydb, SYM_CLASSES, tclass - 1); tclass_dat = policydb.class_val_to_struct[tclass - 1]; common_dat = tclass_dat->comdatum; @@ -716,7 +716,7 @@ static int security_validtrans_handle_fail(struct context *ocontext, audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, "security_validate_transition: denied for" " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", - o, n, t, policydb.p_class_val_to_name[tclass-1]); + o, n, t, sym_name(&policydb, SYM_CLASSES, tclass-1)); out: kfree(o); kfree(n); @@ -1012,9 +1012,9 @@ static int context_struct_to_string(struct context *context, char **scontext, u3 } /* Compute the size of the context. */ - *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1; - *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1; - *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1; + *scontext_len += strlen(sym_name(&policydb, SYM_USERS, context->user - 1)) + 1; + *scontext_len += strlen(sym_name(&policydb, SYM_ROLES, context->role - 1)) + 1; + *scontext_len += strlen(sym_name(&policydb, SYM_TYPES, context->type - 1)) + 1; *scontext_len += mls_compute_context_len(context); if (!scontext) @@ -1030,12 +1030,12 @@ static int context_struct_to_string(struct context *context, char **scontext, u3 * Copy the user name, role name and type name into the context. */ sprintf(scontextp, "%s:%s:%s", - policydb.p_user_val_to_name[context->user - 1], - policydb.p_role_val_to_name[context->role - 1], - policydb.p_type_val_to_name[context->type - 1]); - scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) + - 1 + strlen(policydb.p_role_val_to_name[context->role - 1]) + - 1 + strlen(policydb.p_type_val_to_name[context->type - 1]); + sym_name(&policydb, SYM_USERS, context->user - 1), + sym_name(&policydb, SYM_ROLES, context->role - 1), + sym_name(&policydb, SYM_TYPES, context->type - 1)); + scontextp += strlen(sym_name(&policydb, SYM_USERS, context->user - 1)) + + 1 + strlen(sym_name(&policydb, SYM_ROLES, context->role - 1)) + + 1 + strlen(sym_name(&policydb, SYM_TYPES, context->type - 1)); mls_sid_to_context(context, &scontextp); @@ -1333,7 +1333,7 @@ static int compute_sid_handle_invalid_context( " for scontext=%s" " tcontext=%s" " tclass=%s", - n, s, t, policydb.p_class_val_to_name[tclass-1]); + n, s, t, sym_name(&policydb, SYM_CLASSES, tclass-1)); out: kfree(s); kfree(t); @@ -1654,7 +1654,7 @@ static int convert_context(u32 key, /* Convert the user. */ rc = -EINVAL; usrdatum = hashtab_search(args->newp->p_users.table, - args->oldp->p_user_val_to_name[c->user - 1]); + sym_name(args->oldp, SYM_USERS, c->user - 1)); if (!usrdatum) goto bad; c->user = usrdatum->value; @@ -1662,7 +1662,7 @@ static int convert_context(u32 key, /* Convert the role. */ rc = -EINVAL; role = hashtab_search(args->newp->p_roles.table, - args->oldp->p_role_val_to_name[c->role - 1]); + sym_name(args->oldp, SYM_ROLES, c->role - 1)); if (!role) goto bad; c->role = role->value; @@ -1670,7 +1670,7 @@ static int convert_context(u32 key, /* Convert the type. */ rc = -EINVAL; typdatum = hashtab_search(args->newp->p_types.table, - args->oldp->p_type_val_to_name[c->type - 1]); + sym_name(args->oldp, SYM_TYPES, c->type - 1)); if (!typdatum) goto bad; c->type = typdatum->value; @@ -2326,14 +2326,14 @@ int security_get_bools(int *len, char ***names, int **values) size_t name_len; (*values)[i] = policydb.bool_val_to_struct[i]->state; - name_len = strlen(policydb.p_bool_val_to_name[i]) + 1; + name_len = strlen(sym_name(&policydb, SYM_BOOLS, i)) + 1; rc = -ENOMEM; (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC); if (!(*names)[i]) goto err; - strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len); + strncpy((*names)[i], sym_name(&policydb, SYM_BOOLS, i), name_len); (*names)[i][name_len - 1] = 0; } rc = 0; @@ -2368,7 +2368,7 @@ int security_set_bools(int len, int *values) audit_log(current->audit_context, GFP_ATOMIC, AUDIT_MAC_CONFIG_CHANGE, "bool=%s val=%d old_val=%d auid=%u ses=%u", - policydb.p_bool_val_to_name[i], + sym_name(&policydb, SYM_BOOLS, i), !!values[i], policydb.bool_val_to_struct[i]->state, audit_get_loginuid(current), @@ -3132,7 +3132,7 @@ int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) goto out; rc = -ENOMEM; - secattr->domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1], + secattr->domain = kstrdup(sym_name(&policydb, SYM_TYPES, ctx->type - 1), GFP_ATOMIC); if (secattr->domain == NULL) goto out; -- cgit v1.2.3 From 1d9bc6dc5b6b9cc9299739f0245ce4841f066b92 Mon Sep 17 00:00:00 2001 From: Eric Paris Date: Mon, 29 Nov 2010 15:47:09 -0500 Subject: SELinux: merge policydb_index_classes and policydb_index_others We duplicate functionality in policydb_index_classes() and policydb_index_others(). This patch merges those functions just to make it clear there is nothing special happening here. Signed-off-by: Eric Paris --- security/selinux/ss/policydb.c | 69 ++++++------------------------------------ 1 file changed, 10 insertions(+), 59 deletions(-) (limited to 'security') diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c index 5adca670e5af..be9de3872837 100644 --- a/security/selinux/ss/policydb.c +++ b/security/selinux/ss/policydb.c @@ -411,58 +411,6 @@ static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) = cat_index, }; -/* - * Define the common val_to_name array and the class - * val_to_name and val_to_struct arrays in a policy - * database structure. - * - * Caller must clean up upon failure. - */ -static int policydb_index_classes(struct policydb *p) -{ - int rc; - - rc = -ENOMEM; - p->sym_val_to_name[SYM_COMMONS] = flex_array_alloc(sizeof(char *), - p->p_commons.nprim, - GFP_KERNEL | __GFP_ZERO); - if (!p->sym_val_to_name[SYM_COMMONS]) - goto out; - - rc = flex_array_prealloc(p->sym_val_to_name[SYM_COMMONS], - 0, p->p_commons.nprim - 1, - GFP_KERNEL | __GFP_ZERO); - if (rc) - goto out; - - rc = hashtab_map(p->p_commons.table, common_index, p); - if (rc) - goto out; - - rc = -ENOMEM; - p->class_val_to_struct = - kmalloc(p->p_classes.nprim * sizeof(*(p->class_val_to_struct)), GFP_KERNEL); - if (!p->class_val_to_struct) - goto out; - - rc = -ENOMEM; - p->sym_val_to_name[SYM_CLASSES] = flex_array_alloc(sizeof(char *), - p->p_classes.nprim, - GFP_KERNEL | __GFP_ZERO); - if (!p->sym_val_to_name[SYM_CLASSES]) - goto out; - - rc = flex_array_prealloc(p->sym_val_to_name[SYM_CLASSES], - 0, p->p_classes.nprim - 1, - GFP_KERNEL | __GFP_ZERO); - if (rc) - goto out; - - rc = hashtab_map(p->p_classes.table, class_index, p); -out: - return rc; -} - #ifdef DEBUG_HASHES static void symtab_hash_eval(struct symtab *s) { @@ -500,7 +448,7 @@ static inline void rangetr_hash_eval(struct hashtab *h) * * Caller must clean up on failure. */ -static int policydb_index_others(struct policydb *p) +static int policydb_index(struct policydb *p) { int i, rc; @@ -519,6 +467,13 @@ static int policydb_index_others(struct policydb *p) symtab_hash_eval(p->symtab); #endif + rc = -ENOMEM; + p->class_val_to_struct = + kmalloc(p->p_classes.nprim * sizeof(*(p->class_val_to_struct)), + GFP_KERNEL); + if (!p->class_val_to_struct) + goto out; + rc = -ENOMEM; p->role_val_to_struct = kmalloc(p->p_roles.nprim * sizeof(*(p->role_val_to_struct)), @@ -550,7 +505,7 @@ static int policydb_index_others(struct policydb *p) if (cond_init_bool_indexes(p)) goto out; - for (i = SYM_ROLES; i < SYM_NUM; i++) { + for (i = 0; i < SYM_NUM; i++) { rc = -ENOMEM; p->sym_val_to_name[i] = flex_array_alloc(sizeof(char *), p->symtab[i].nprim, @@ -2296,11 +2251,7 @@ int policydb_read(struct policydb *p, void *fp) lra = ra; } - rc = policydb_index_classes(p); - if (rc) - goto bad; - - rc = policydb_index_others(p); + rc = policydb_index(p); if (rc) goto bad; -- cgit v1.2.3 From 676dac4b1bee0469d6932f698aeb77e8489f5861 Mon Sep 17 00:00:00 2001 From: Casey Schaufler Date: Thu, 2 Dec 2010 06:43:39 -0800 Subject: This patch adds a new security attribute to Smack called SMACK64EXEC. It defines label that is used while task is running. Exception: in smack_task_wait() child task is checked for write access to parent task using label inherited from the task that forked it. Fixed issues from previous submit: - SMACK64EXEC was not read when SMACK64 was not set. - inode security blob was not updated after setting SMACK64EXEC - inode security blob was not updated when removing SMACK64EXEC --- include/linux/xattr.h | 2 + security/smack/smack.h | 30 +++++++ security/smack/smack_access.c | 4 +- security/smack/smack_lsm.c | 192 +++++++++++++++++++++++++++++++----------- security/smack/smackfs.c | 4 +- 5 files changed, 178 insertions(+), 54 deletions(-) (limited to 'security') diff --git a/include/linux/xattr.h b/include/linux/xattr.h index f1e5bde4b35a..351c7901d74a 100644 --- a/include/linux/xattr.h +++ b/include/linux/xattr.h @@ -40,9 +40,11 @@ #define XATTR_SMACK_SUFFIX "SMACK64" #define XATTR_SMACK_IPIN "SMACK64IPIN" #define XATTR_SMACK_IPOUT "SMACK64IPOUT" +#define XATTR_SMACK_EXEC "SMACK64EXEC" #define XATTR_NAME_SMACK XATTR_SECURITY_PREFIX XATTR_SMACK_SUFFIX #define XATTR_NAME_SMACKIPIN XATTR_SECURITY_PREFIX XATTR_SMACK_IPIN #define XATTR_NAME_SMACKIPOUT XATTR_SECURITY_PREFIX XATTR_SMACK_IPOUT +#define XATTR_NAME_SMACKEXEC XATTR_SECURITY_PREFIX XATTR_SMACK_EXEC #define XATTR_CAPS_SUFFIX "capability" #define XATTR_NAME_CAPS XATTR_SECURITY_PREFIX XATTR_CAPS_SUFFIX diff --git a/security/smack/smack.h b/security/smack/smack.h index 43ae747a5aa4..a2e2cdfab4ef 100644 --- a/security/smack/smack.h +++ b/security/smack/smack.h @@ -51,10 +51,16 @@ struct socket_smack { */ struct inode_smack { char *smk_inode; /* label of the fso */ + char *smk_task; /* label of the task */ struct mutex smk_lock; /* initialization lock */ int smk_flags; /* smack inode flags */ }; +struct task_smack { + char *smk_task; /* label used for access control */ + char *smk_forked; /* label when forked */ +}; + #define SMK_INODE_INSTANT 0x01 /* inode is instantiated */ /* @@ -242,6 +248,30 @@ static inline char *smk_of_inode(const struct inode *isp) return sip->smk_inode; } +/* + * Present a pointer to the smack label in an task blob. + */ +static inline char *smk_of_task(const struct task_smack *tsp) +{ + return tsp->smk_task; +} + +/* + * Present a pointer to the forked smack label in an task blob. + */ +static inline char *smk_of_forked(const struct task_smack *tsp) +{ + return tsp->smk_forked; +} + +/* + * Present a pointer to the smack label in the curren task blob. + */ +static inline char *smk_of_current(void) +{ + return smk_of_task(current_security()); +} + /* * logging functions */ diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c index f4fac64c4da8..42becbc1ce33 100644 --- a/security/smack/smack_access.c +++ b/security/smack/smack_access.c @@ -185,7 +185,7 @@ out_audit: int smk_curacc(char *obj_label, u32 mode, struct smk_audit_info *a) { int rc; - char *sp = current_security(); + char *sp = smk_of_current(); rc = smk_access(sp, obj_label, mode, NULL); if (rc == 0) @@ -196,7 +196,7 @@ int smk_curacc(char *obj_label, u32 mode, struct smk_audit_info *a) * only one that gets privilege and current does not * have that label. */ - if (smack_onlycap != NULL && smack_onlycap != current->cred->security) + if (smack_onlycap != NULL && smack_onlycap != sp) goto out_audit; if (capable(CAP_MAC_OVERRIDE)) diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 04a98c361a65..7e19afe0e738 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -43,7 +43,7 @@ * Returns a pointer to the master list entry for the Smack label * or NULL if there was no label to fetch. */ -static char *smk_fetch(struct inode *ip, struct dentry *dp) +static char *smk_fetch(const char *name, struct inode *ip, struct dentry *dp) { int rc; char in[SMK_LABELLEN]; @@ -51,7 +51,7 @@ static char *smk_fetch(struct inode *ip, struct dentry *dp) if (ip->i_op->getxattr == NULL) return NULL; - rc = ip->i_op->getxattr(dp, XATTR_NAME_SMACK, in, SMK_LABELLEN); + rc = ip->i_op->getxattr(dp, name, in, SMK_LABELLEN); if (rc < 0) return NULL; @@ -103,8 +103,8 @@ static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) if (rc != 0) return rc; - sp = current_security(); - tsp = task_security(ctp); + sp = smk_of_current(); + tsp = smk_of_task(task_security(ctp)); smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); smk_ad_setfield_u_tsk(&ad, ctp); @@ -138,8 +138,8 @@ static int smack_ptrace_traceme(struct task_struct *ptp) smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); smk_ad_setfield_u_tsk(&ad, ptp); - sp = current_security(); - tsp = task_security(ptp); + sp = smk_of_current(); + tsp = smk_of_task(task_security(ptp)); /* we won't log here, because rc can be overriden */ rc = smk_access(tsp, sp, MAY_READWRITE, NULL); if (rc != 0 && has_capability(ptp, CAP_MAC_OVERRIDE)) @@ -160,7 +160,7 @@ static int smack_ptrace_traceme(struct task_struct *ptp) static int smack_syslog(int typefrom_file) { int rc = 0; - char *sp = current_security(); + char *sp = smk_of_current(); if (capable(CAP_MAC_OVERRIDE)) return 0; @@ -390,6 +390,40 @@ static int smack_sb_umount(struct vfsmount *mnt, int flags) return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); } +/* + * BPRM hooks + */ + +static int smack_bprm_set_creds(struct linux_binprm *bprm) +{ + struct task_smack *tsp = bprm->cred->security; + struct inode_smack *isp; + struct dentry *dp; + int rc; + + rc = cap_bprm_set_creds(bprm); + if (rc != 0) + return rc; + + if (bprm->cred_prepared) + return 0; + + if (bprm->file == NULL || bprm->file->f_dentry == NULL) + return 0; + + dp = bprm->file->f_dentry; + + if (dp->d_inode == NULL) + return 0; + + isp = dp->d_inode->i_security; + + if (isp->smk_task != NULL) + tsp->smk_task = isp->smk_task; + + return 0; +} + /* * Inode hooks */ @@ -402,7 +436,7 @@ static int smack_sb_umount(struct vfsmount *mnt, int flags) */ static int smack_inode_alloc_security(struct inode *inode) { - inode->i_security = new_inode_smack(current_security()); + inode->i_security = new_inode_smack(smk_of_current()); if (inode->i_security == NULL) return -ENOMEM; return 0; @@ -664,7 +698,8 @@ static int smack_inode_setxattr(struct dentry *dentry, const char *name, if (strcmp(name, XATTR_NAME_SMACK) == 0 || strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || - strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { + strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || + strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { if (!capable(CAP_MAC_ADMIN)) rc = -EPERM; /* @@ -704,9 +739,10 @@ static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, char *nsp; /* - * Not SMACK + * Not SMACK or SMACKEXEC */ - if (strcmp(name, XATTR_NAME_SMACK)) + if (strcmp(name, XATTR_NAME_SMACK) && + strcmp(name, XATTR_NAME_SMACKEXEC)) return; isp = dentry->d_inode->i_security; @@ -716,10 +752,18 @@ static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, * assignment. */ nsp = smk_import(value, size); - if (nsp != NULL) - isp->smk_inode = nsp; - else - isp->smk_inode = smack_known_invalid.smk_known; + + if (strcmp(name, XATTR_NAME_SMACK) == 0) { + if (nsp != NULL) + isp->smk_inode = nsp; + else + isp->smk_inode = smack_known_invalid.smk_known; + } else { + if (nsp != NULL) + isp->smk_task = nsp; + else + isp->smk_task = smack_known_invalid.smk_known; + } return; } @@ -752,12 +796,14 @@ static int smack_inode_getxattr(struct dentry *dentry, const char *name) */ static int smack_inode_removexattr(struct dentry *dentry, const char *name) { + struct inode_smack *isp; struct smk_audit_info ad; int rc = 0; if (strcmp(name, XATTR_NAME_SMACK) == 0 || strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || - strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { + strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || + strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { if (!capable(CAP_MAC_ADMIN)) rc = -EPERM; } else @@ -768,6 +814,11 @@ static int smack_inode_removexattr(struct dentry *dentry, const char *name) if (rc == 0) rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); + if (rc == 0) { + isp = dentry->d_inode->i_security; + isp->smk_task = NULL; + } + return rc; } @@ -895,7 +946,7 @@ static int smack_file_permission(struct file *file, int mask) */ static int smack_file_alloc_security(struct file *file) { - file->f_security = current_security(); + file->f_security = smk_of_current(); return 0; } @@ -1005,7 +1056,7 @@ static int smack_file_fcntl(struct file *file, unsigned int cmd, */ static int smack_file_set_fowner(struct file *file) { - file->f_security = current_security(); + file->f_security = smk_of_current(); return 0; } @@ -1025,7 +1076,7 @@ static int smack_file_send_sigiotask(struct task_struct *tsk, { struct file *file; int rc; - char *tsp = tsk->cred->security; + char *tsp = smk_of_task(tsk->cred->security); struct smk_audit_info ad; /* @@ -1082,7 +1133,9 @@ static int smack_file_receive(struct file *file) */ static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) { - cred->security = NULL; + cred->security = kzalloc(sizeof(struct task_smack), gfp); + if (cred->security == NULL) + return -ENOMEM; return 0; } @@ -1097,7 +1150,7 @@ static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) */ static void smack_cred_free(struct cred *cred) { - cred->security = NULL; + kfree(cred->security); } /** @@ -1111,7 +1164,16 @@ static void smack_cred_free(struct cred *cred) static int smack_cred_prepare(struct cred *new, const struct cred *old, gfp_t gfp) { - new->security = old->security; + struct task_smack *old_tsp = old->security; + struct task_smack *new_tsp; + + new_tsp = kzalloc(sizeof(struct task_smack), gfp); + if (new_tsp == NULL) + return -ENOMEM; + + new_tsp->smk_task = old_tsp->smk_task; + new_tsp->smk_forked = old_tsp->smk_task; + new->security = new_tsp; return 0; } @@ -1124,7 +1186,11 @@ static int smack_cred_prepare(struct cred *new, const struct cred *old, */ static void smack_cred_transfer(struct cred *new, const struct cred *old) { - new->security = old->security; + struct task_smack *old_tsp = old->security; + struct task_smack *new_tsp = new->security; + + new_tsp->smk_task = old_tsp->smk_task; + new_tsp->smk_forked = old_tsp->smk_task; } /** @@ -1136,12 +1202,13 @@ static void smack_cred_transfer(struct cred *new, const struct cred *old) */ static int smack_kernel_act_as(struct cred *new, u32 secid) { + struct task_smack *new_tsp = new->security; char *smack = smack_from_secid(secid); if (smack == NULL) return -EINVAL; - new->security = smack; + new_tsp->smk_task = smack; return 0; } @@ -1157,8 +1224,10 @@ static int smack_kernel_create_files_as(struct cred *new, struct inode *inode) { struct inode_smack *isp = inode->i_security; + struct task_smack *tsp = new->security; - new->security = isp->smk_inode; + tsp->smk_forked = isp->smk_inode; + tsp->smk_task = isp->smk_inode; return 0; } @@ -1175,7 +1244,7 @@ static int smk_curacc_on_task(struct task_struct *p, int access) smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); smk_ad_setfield_u_tsk(&ad, p); - return smk_curacc(task_security(p), access, &ad); + return smk_curacc(smk_of_task(task_security(p)), access, &ad); } /** @@ -1221,7 +1290,7 @@ static int smack_task_getsid(struct task_struct *p) */ static void smack_task_getsecid(struct task_struct *p, u32 *secid) { - *secid = smack_to_secid(task_security(p)); + *secid = smack_to_secid(smk_of_task(task_security(p))); } /** @@ -1333,14 +1402,15 @@ static int smack_task_kill(struct task_struct *p, struct siginfo *info, * can write the receiver. */ if (secid == 0) - return smk_curacc(task_security(p), MAY_WRITE, &ad); + return smk_curacc(smk_of_task(task_security(p)), MAY_WRITE, + &ad); /* * If the secid isn't 0 we're dealing with some USB IO * specific behavior. This is not clean. For one thing * we can't take privilege into account. */ - return smk_access(smack_from_secid(secid), task_security(p), - MAY_WRITE, &ad); + return smk_access(smack_from_secid(secid), + smk_of_task(task_security(p)), MAY_WRITE, &ad); } /** @@ -1352,12 +1422,12 @@ static int smack_task_kill(struct task_struct *p, struct siginfo *info, static int smack_task_wait(struct task_struct *p) { struct smk_audit_info ad; - char *sp = current_security(); - char *tsp = task_security(p); + char *sp = smk_of_current(); + char *tsp = smk_of_forked(task_security(p)); int rc; /* we don't log here, we can be overriden */ - rc = smk_access(sp, tsp, MAY_WRITE, NULL); + rc = smk_access(tsp, sp, MAY_WRITE, NULL); if (rc == 0) goto out_log; @@ -1378,7 +1448,7 @@ static int smack_task_wait(struct task_struct *p) out_log: smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); smk_ad_setfield_u_tsk(&ad, p); - smack_log(sp, tsp, MAY_WRITE, rc, &ad); + smack_log(tsp, sp, MAY_WRITE, rc, &ad); return rc; } @@ -1392,7 +1462,7 @@ static int smack_task_wait(struct task_struct *p) static void smack_task_to_inode(struct task_struct *p, struct inode *inode) { struct inode_smack *isp = inode->i_security; - isp->smk_inode = task_security(p); + isp->smk_inode = smk_of_task(task_security(p)); } /* @@ -1411,7 +1481,7 @@ static void smack_task_to_inode(struct task_struct *p, struct inode *inode) */ static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) { - char *csp = current_security(); + char *csp = smk_of_current(); struct socket_smack *ssp; ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); @@ -1752,7 +1822,7 @@ static int smack_flags_to_may(int flags) */ static int smack_msg_msg_alloc_security(struct msg_msg *msg) { - msg->security = current_security(); + msg->security = smk_of_current(); return 0; } @@ -1788,7 +1858,7 @@ static int smack_shm_alloc_security(struct shmid_kernel *shp) { struct kern_ipc_perm *isp = &shp->shm_perm; - isp->security = current_security(); + isp->security = smk_of_current(); return 0; } @@ -1911,7 +1981,7 @@ static int smack_sem_alloc_security(struct sem_array *sma) { struct kern_ipc_perm *isp = &sma->sem_perm; - isp->security = current_security(); + isp->security = smk_of_current(); return 0; } @@ -2029,7 +2099,7 @@ static int smack_msg_queue_alloc_security(struct msg_queue *msq) { struct kern_ipc_perm *kisp = &msq->q_perm; - kisp->security = current_security(); + kisp->security = smk_of_current(); return 0; } @@ -2201,7 +2271,7 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) struct super_block *sbp; struct superblock_smack *sbsp; struct inode_smack *isp; - char *csp = current_security(); + char *csp = smk_of_current(); char *fetched; char *final; struct dentry *dp; @@ -2321,9 +2391,12 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) * Get the dentry for xattr. */ dp = dget(opt_dentry); - fetched = smk_fetch(inode, dp); + fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp); if (fetched != NULL) final = fetched; + isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, + dp); + dput(dp); break; } @@ -2358,7 +2431,7 @@ static int smack_getprocattr(struct task_struct *p, char *name, char **value) if (strcmp(name, "current") != 0) return -EINVAL; - cp = kstrdup(task_security(p), GFP_KERNEL); + cp = kstrdup(smk_of_task(task_security(p)), GFP_KERNEL); if (cp == NULL) return -ENOMEM; @@ -2382,6 +2455,7 @@ static int smack_getprocattr(struct task_struct *p, char *name, char **value) static int smack_setprocattr(struct task_struct *p, char *name, void *value, size_t size) { + struct task_smack *tsp; struct cred *new; char *newsmack; @@ -2414,7 +2488,13 @@ static int smack_setprocattr(struct task_struct *p, char *name, new = prepare_creds(); if (new == NULL) return -ENOMEM; - new->security = newsmack; + tsp = kzalloc(sizeof(struct task_smack), GFP_KERNEL); + if (tsp == NULL) { + kfree(new); + return -ENOMEM; + } + tsp->smk_task = newsmack; + new->security = tsp; commit_creds(new); return size; } @@ -2715,7 +2795,7 @@ static void smack_sock_graft(struct sock *sk, struct socket *parent) return; ssp = sk->sk_security; - ssp->smk_in = ssp->smk_out = current_security(); + ssp->smk_in = ssp->smk_out = smk_of_current(); /* cssp->smk_packet is already set in smack_inet_csk_clone() */ } @@ -2836,7 +2916,7 @@ static void smack_inet_csk_clone(struct sock *sk, static int smack_key_alloc(struct key *key, const struct cred *cred, unsigned long flags) { - key->security = cred->security; + key->security = smk_of_task(cred->security); return 0; } @@ -2865,6 +2945,7 @@ static int smack_key_permission(key_ref_t key_ref, { struct key *keyp; struct smk_audit_info ad; + char *tsp = smk_of_task(cred->security); keyp = key_ref_to_ptr(key_ref); if (keyp == NULL) @@ -2878,14 +2959,14 @@ static int smack_key_permission(key_ref_t key_ref, /* * This should not occur */ - if (cred->security == NULL) + if (tsp == NULL) return -EACCES; #ifdef CONFIG_AUDIT smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); ad.a.u.key_struct.key = keyp->serial; ad.a.u.key_struct.key_desc = keyp->description; #endif - return smk_access(cred->security, keyp->security, + return smk_access(tsp, keyp->security, MAY_READWRITE, &ad); } #endif /* CONFIG_KEYS */ @@ -3087,6 +3168,8 @@ struct security_operations smack_ops = { .sb_mount = smack_sb_mount, .sb_umount = smack_sb_umount, + .bprm_set_creds = smack_bprm_set_creds, + .inode_alloc_security = smack_inode_alloc_security, .inode_free_security = smack_inode_free_security, .inode_init_security = smack_inode_init_security, @@ -3223,9 +3306,16 @@ static __init void init_smack_know_list(void) static __init int smack_init(void) { struct cred *cred; + struct task_smack *tsp; - if (!security_module_enable(&smack_ops)) + tsp = kzalloc(sizeof(struct task_smack), GFP_KERNEL); + if (tsp == NULL) + return -ENOMEM; + + if (!security_module_enable(&smack_ops)) { + kfree(tsp); return 0; + } printk(KERN_INFO "Smack: Initializing.\n"); @@ -3233,7 +3323,9 @@ static __init int smack_init(void) * Set the security state for the initial task. */ cred = (struct cred *) current->cred; - cred->security = &smack_known_floor.smk_known; + tsp->smk_forked = smack_known_floor.smk_known; + tsp->smk_task = smack_known_floor.smk_known; + cred->security = tsp; /* initialize the smack_know_list */ init_smack_know_list(); diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c index dc1fd6239f24..01a0be93d8d0 100644 --- a/security/smack/smackfs.c +++ b/security/smack/smackfs.c @@ -121,7 +121,7 @@ static void smk_netlabel_audit_set(struct netlbl_audit *nap) { nap->loginuid = audit_get_loginuid(current); nap->sessionid = audit_get_sessionid(current); - nap->secid = smack_to_secid(current_security()); + nap->secid = smack_to_secid(smk_of_current()); } /* @@ -1160,7 +1160,7 @@ static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { char in[SMK_LABELLEN]; - char *sp = current->cred->security; + char *sp = smk_of_task(current->cred->security); if (!capable(CAP_MAC_ADMIN)) return -EPERM; -- cgit v1.2.3 From 415103f9932d45f7927f4b17e3a9a13834cdb9a1 Mon Sep 17 00:00:00 2001 From: Eric Paris Date: Thu, 2 Dec 2010 16:13:40 -0500 Subject: SELinux: do not compute transition labels on mountpoint labeled filesystems selinux_inode_init_security computes transitions sids even for filesystems that use mount point labeling. It shouldn't do that. It should just use the mount point label always and no matter what. This causes 2 problems. 1) it makes file creation slower than it needs to be since we calculate the transition sid and 2) it allows files to be created with a different label than the mount point! # id -Z staff_u:sysadm_r:sysadm_t:s0-s0:c0.c1023 # sesearch --type --class file --source sysadm_t --target tmp_t Found 1 semantic te rules: type_transition sysadm_t tmp_t : file user_tmp_t; # mount -o loop,context="system_u:object_r:tmp_t:s0" /tmp/fs /mnt/tmp # ls -lZ /mnt/tmp drwx------. root root system_u:object_r:tmp_t:s0 lost+found # touch /mnt/tmp/file1 # ls -lZ /mnt/tmp -rw-r--r--. root root staff_u:object_r:user_tmp_t:s0 file1 drwx------. root root system_u:object_r:tmp_t:s0 lost+found Whoops, we have a mount point labeled filesystem tmp_t with a user_tmp_t labeled file! Signed-off-by: Eric Paris Reviewed-by: Reviewed-by: James Morris --- security/selinux/hooks.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'security') diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 65fa8bf596f5..cda18fd8ca0f 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -2525,7 +2525,10 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir, sid = tsec->sid; newsid = tsec->create_sid; - if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) { + if ((sbsec->flags & SE_SBINITIALIZED) && + (sbsec->behavior == SECURITY_FS_USE_MNTPOINT)) + newsid = sbsec->mntpoint_sid; + else if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) { rc = security_transition_sid(sid, dsec->sid, inode_mode_to_security_class(inode->i_mode), &newsid); -- cgit v1.2.3 From 73ff5fc0a86b28b77e02a6963b388d1dbfa0a263 Mon Sep 17 00:00:00 2001 From: Eric Paris Date: Tue, 7 Dec 2010 16:17:28 -0500 Subject: selinux: cache sidtab_context_to_sid results sidtab_context_to_sid takes up a large share of time when creating large numbers of new inodes (~30-40% in oprofile runs). This patch implements a cache of 3 entries which is checked before we do a full context_to_sid lookup. On one system this showed over a x3 improvement in the number of inodes that could be created per second and around a 20% improvement on another system. Any time we look up the same context string sucessivly (imagine ls -lZ) we should hit this cache hot. A cache miss should have a relatively minor affect on performance next to doing the full table search. All operations on the cache are done COMPLETELY lockless. We know that all struct sidtab_node objects created will never be deleted until a new policy is loaded thus we never have to worry about a pointer being dereferenced. Since we also know that pointer assignment is atomic we know that the cache will always have valid pointers. Given this information we implement a FIFO cache in an array of 3 pointers. Every result (whether a cache hit or table lookup) will be places in the 0 spot of the cache and the rest of the entries moved down one spot. The 3rd entry will be lost. Races are possible and are even likely to happen. Lets assume that 4 tasks are hitting sidtab_context_to_sid. The first task checks against the first entry in the cache and it is a miss. Now lets assume a second task updates the cache with a new entry. This will push the first entry back to the second spot. Now the first task might check against the second entry (which it already checked) and will miss again. Now say some third task updates the cache and push the second entry to the third spot. The first task my check the third entry (for the third time!) and again have a miss. At which point it will just do a full table lookup. No big deal! Signed-off-by: Eric Paris --- security/selinux/ss/sidtab.c | 39 +++++++++++++++++++++++++++++++++++++-- security/selinux/ss/sidtab.h | 2 ++ 2 files changed, 39 insertions(+), 2 deletions(-) (limited to 'security') diff --git a/security/selinux/ss/sidtab.c b/security/selinux/ss/sidtab.c index e817989764cd..5840a35155fc 100644 --- a/security/selinux/ss/sidtab.c +++ b/security/selinux/ss/sidtab.c @@ -147,6 +147,17 @@ out: return rc; } +static void sidtab_update_cache(struct sidtab *s, struct sidtab_node *n, int loc) +{ + BUG_ON(loc >= SIDTAB_CACHE_LEN); + + while (loc > 0) { + s->cache[loc] = s->cache[loc - 1]; + loc--; + } + s->cache[0] = n; +} + static inline u32 sidtab_search_context(struct sidtab *s, struct context *context) { @@ -156,14 +167,33 @@ static inline u32 sidtab_search_context(struct sidtab *s, for (i = 0; i < SIDTAB_SIZE; i++) { cur = s->htable[i]; while (cur) { - if (context_cmp(&cur->context, context)) + if (context_cmp(&cur->context, context)) { + sidtab_update_cache(s, cur, SIDTAB_CACHE_LEN - 1); return cur->sid; + } cur = cur->next; } } return 0; } +static inline u32 sidtab_search_cache(struct sidtab *s, struct context *context) +{ + int i; + struct sidtab_node *node; + + for (i = 0; i < SIDTAB_CACHE_LEN; i++) { + node = s->cache[i]; + if (unlikely(!node)) + return 0; + if (context_cmp(&node->context, context)) { + sidtab_update_cache(s, node, i); + return node->sid; + } + } + return 0; +} + int sidtab_context_to_sid(struct sidtab *s, struct context *context, u32 *out_sid) @@ -174,7 +204,9 @@ int sidtab_context_to_sid(struct sidtab *s, *out_sid = SECSID_NULL; - sid = sidtab_search_context(s, context); + sid = sidtab_search_cache(s, context); + if (!sid) + sid = sidtab_search_context(s, context); if (!sid) { spin_lock_irqsave(&s->lock, flags); /* Rescan now that we hold the lock. */ @@ -259,12 +291,15 @@ void sidtab_destroy(struct sidtab *s) void sidtab_set(struct sidtab *dst, struct sidtab *src) { unsigned long flags; + int i; spin_lock_irqsave(&src->lock, flags); dst->htable = src->htable; dst->nel = src->nel; dst->next_sid = src->next_sid; dst->shutdown = 0; + for (i = 0; i < SIDTAB_CACHE_LEN; i++) + dst->cache[i] = NULL; spin_unlock_irqrestore(&src->lock, flags); } diff --git a/security/selinux/ss/sidtab.h b/security/selinux/ss/sidtab.h index 64ea5b1cdea4..84dc154d9389 100644 --- a/security/selinux/ss/sidtab.h +++ b/security/selinux/ss/sidtab.h @@ -26,6 +26,8 @@ struct sidtab { unsigned int nel; /* number of elements */ unsigned int next_sid; /* next SID to allocate */ unsigned char shutdown; +#define SIDTAB_CACHE_LEN 3 + struct sidtab_node *cache[SIDTAB_CACHE_LEN]; spinlock_t lock; }; -- cgit v1.2.3 From 5c6d1125f8dbd1bfef39e38fbc2837003be78a59 Mon Sep 17 00:00:00 2001 From: Jarkko Sakkinen Date: Tue, 7 Dec 2010 13:34:01 +0200 Subject: Smack: Transmute labels on specified directories In a situation where Smack access rules allow processes with multiple labels to write to a directory it is easy to get into a situation where the directory gets cluttered with files that the owner can't deal with because while they could be written to the directory a process at the label of the directory can't write them. This is generally the desired behavior, but when it isn't it is a real issue. This patch introduces a new attribute SMACK64TRANSMUTE that instructs Smack to create the file with the label of the directory under certain circumstances. A new access mode, "t" for transmute, is made available to Smack access rules, which are expanded from "rwxa" to "rwxat". If a file is created in a directory marked as transmutable and if access was granted to perform the operation by a rule that included the transmute mode, then the file gets the Smack label of the directory instead of the Smack label of the creating process. Note that this is equivalent to creating an empty file at the label of the directory and then having the other process write to it. The transmute scheme requires that both the access rule allows transmutation and that the directory be explicitly marked. Signed-off-by: Jarkko Sakkinen Signed-off-by: Casey Schaufler --- include/linux/xattr.h | 2 ++ security/smack/smack.h | 17 +++++++++- security/smack/smack_access.c | 54 +++++++++++++++++++++++-------- security/smack/smack_lsm.c | 74 +++++++++++++++++++++++++++++-------------- security/smack/smackfs.c | 37 +++++++++++++++++++--- 5 files changed, 141 insertions(+), 43 deletions(-) (limited to 'security') diff --git a/include/linux/xattr.h b/include/linux/xattr.h index 351c7901d74a..e6131ef98d8f 100644 --- a/include/linux/xattr.h +++ b/include/linux/xattr.h @@ -41,10 +41,12 @@ #define XATTR_SMACK_IPIN "SMACK64IPIN" #define XATTR_SMACK_IPOUT "SMACK64IPOUT" #define XATTR_SMACK_EXEC "SMACK64EXEC" +#define XATTR_SMACK_TRANSMUTE "SMACK64TRANSMUTE" #define XATTR_NAME_SMACK XATTR_SECURITY_PREFIX XATTR_SMACK_SUFFIX #define XATTR_NAME_SMACKIPIN XATTR_SECURITY_PREFIX XATTR_SMACK_IPIN #define XATTR_NAME_SMACKIPOUT XATTR_SECURITY_PREFIX XATTR_SMACK_IPOUT #define XATTR_NAME_SMACKEXEC XATTR_SECURITY_PREFIX XATTR_SMACK_EXEC +#define XATTR_NAME_SMACKTRANSMUTE XATTR_SECURITY_PREFIX XATTR_SMACK_TRANSMUTE #define XATTR_CAPS_SUFFIX "capability" #define XATTR_NAME_CAPS XATTR_SECURITY_PREFIX XATTR_CAPS_SUFFIX diff --git a/security/smack/smack.h b/security/smack/smack.h index a2e2cdfab4ef..129c4eb8ffb1 100644 --- a/security/smack/smack.h +++ b/security/smack/smack.h @@ -62,6 +62,7 @@ struct task_smack { }; #define SMK_INODE_INSTANT 0x01 /* inode is instantiated */ +#define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */ /* * A label access rule. @@ -166,6 +167,10 @@ struct smack_known { #define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */ #define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */ +/* + * Flag for transmute access + */ +#define MAY_TRANSMUTE 64 /* * Just to make the common cases easier to deal with */ @@ -197,6 +202,7 @@ struct inode_smack *new_inode_smack(char *); /* * These functions are in smack_access.c */ +int smk_access_entry(char *, char *); int smk_access(char *, char *, int, struct smk_audit_info *); int smk_curacc(char *, u32, struct smk_audit_info *); int smack_to_cipso(const char *, struct smack_cipso *); @@ -239,6 +245,15 @@ static inline void smack_catset_bit(int cat, char *catsetp) catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8); } +/* + * Is the directory transmuting? + */ +static inline int smk_inode_transmutable(const struct inode *isp) +{ + struct inode_smack *sip = isp->i_security; + return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0; +} + /* * Present a pointer to the smack label in an inode blob. */ @@ -265,7 +280,7 @@ static inline char *smk_of_forked(const struct task_smack *tsp) } /* - * Present a pointer to the smack label in the curren task blob. + * Present a pointer to the smack label in the current task blob. */ static inline char *smk_of_current(void) { diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c index 42becbc1ce33..7ba8478f599e 100644 --- a/security/smack/smack_access.c +++ b/security/smack/smack_access.c @@ -66,6 +66,46 @@ static u32 smack_next_secid = 10; */ int log_policy = SMACK_AUDIT_DENIED; +/** + * smk_access_entry - look up matching access rule + * @subject_label: a pointer to the subject's Smack label + * @object_label: a pointer to the object's Smack label + * + * This function looks up the subject/object pair in the + * access rule list and returns pointer to the matching rule if found, + * NULL otherwise. + * + * NOTE: + * Even though Smack labels are usually shared on smack_list + * labels that come in off the network can't be imported + * and added to the list for locking reasons. + * + * Therefore, it is necessary to check the contents of the labels, + * not just the pointer values. Of course, in most cases the labels + * will be on the list, so checking the pointers may be a worthwhile + * optimization. + */ +int smk_access_entry(char *subject_label, char *object_label) +{ + u32 may = MAY_NOT; + struct smack_rule *srp; + + rcu_read_lock(); + list_for_each_entry_rcu(srp, &smack_rule_list, list) { + if (srp->smk_subject == subject_label || + strcmp(srp->smk_subject, subject_label) == 0) { + if (srp->smk_object == object_label || + strcmp(srp->smk_object, object_label) == 0) { + may = srp->smk_access; + break; + } + } + } + rcu_read_unlock(); + + return may; +} + /** * smk_access - determine if a subject has a specific access to an object * @subject_label: a pointer to the subject's Smack label @@ -90,7 +130,6 @@ int smk_access(char *subject_label, char *object_label, int request, struct smk_audit_info *a) { u32 may = MAY_NOT; - struct smack_rule *srp; int rc = 0; /* @@ -144,18 +183,7 @@ int smk_access(char *subject_label, char *object_label, int request, * access (e.g. read is included in readwrite) it's * good. */ - rcu_read_lock(); - list_for_each_entry_rcu(srp, &smack_rule_list, list) { - if (srp->smk_subject == subject_label || - strcmp(srp->smk_subject, subject_label) == 0) { - if (srp->smk_object == object_label || - strcmp(srp->smk_object, object_label) == 0) { - may = srp->smk_access; - break; - } - } - } - rcu_read_unlock(); + may = smk_access_entry(subject_label, object_label); /* * This is a bit map operation. */ diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 7e19afe0e738..05dc4da2e25f 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -3,12 +3,14 @@ * * This file contains the smack hook function implementations. * - * Author: + * Authors: * Casey Schaufler + * Jarkko Sakkinen * * Copyright (C) 2007 Casey Schaufler * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. * Paul Moore + * Copyright (C) 2010 Nokia Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2, @@ -35,6 +37,9 @@ #define task_security(task) (task_cred_xxx((task), security)) +#define TRANS_TRUE "TRUE" +#define TRANS_TRUE_SIZE 4 + /** * smk_fetch - Fetch the smack label from a file. * @ip: a pointer to the inode @@ -468,6 +473,8 @@ static int smack_inode_init_security(struct inode *inode, struct inode *dir, char **name, void **value, size_t *len) { char *isp = smk_of_inode(inode); + char *dsp = smk_of_inode(dir); + u32 may; if (name) { *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL); @@ -476,6 +483,16 @@ static int smack_inode_init_security(struct inode *inode, struct inode *dir, } if (value) { + may = smk_access_entry(smk_of_current(), dsp); + + /* + * If the access rule allows transmutation and + * the directory requests transmutation then + * by all means transmute. + */ + if (((may & MAY_TRANSMUTE) != 0) && smk_inode_transmutable(dir)) + isp = dsp; + *value = kstrdup(isp, GFP_KERNEL); if (*value == NULL) return -ENOMEM; @@ -709,6 +726,12 @@ static int smack_inode_setxattr(struct dentry *dentry, const char *name, if (size == 0 || size >= SMK_LABELLEN || smk_import(value, size) == NULL) rc = -EINVAL; + } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { + if (!capable(CAP_MAC_ADMIN)) + rc = -EPERM; + if (size != TRANS_TRUE_SIZE || + strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) + rc = -EINVAL; } else rc = cap_inode_setxattr(dentry, name, value, size, flags); @@ -735,35 +758,23 @@ static int smack_inode_setxattr(struct dentry *dentry, const char *name, static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags) { - struct inode_smack *isp; char *nsp; - - /* - * Not SMACK or SMACKEXEC - */ - if (strcmp(name, XATTR_NAME_SMACK) && - strcmp(name, XATTR_NAME_SMACKEXEC)) - return; - - isp = dentry->d_inode->i_security; - - /* - * No locking is done here. This is a pointer - * assignment. - */ - nsp = smk_import(value, size); + struct inode_smack *isp = dentry->d_inode->i_security; if (strcmp(name, XATTR_NAME_SMACK) == 0) { + nsp = smk_import(value, size); if (nsp != NULL) isp->smk_inode = nsp; else isp->smk_inode = smack_known_invalid.smk_known; - } else { + } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { + nsp = smk_import(value, size); if (nsp != NULL) isp->smk_task = nsp; else isp->smk_task = smack_known_invalid.smk_known; - } + } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) + isp->smk_flags |= SMK_INODE_TRANSMUTE; return; } @@ -803,7 +814,8 @@ static int smack_inode_removexattr(struct dentry *dentry, const char *name) if (strcmp(name, XATTR_NAME_SMACK) == 0 || strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || - strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { + strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || + strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { if (!capable(CAP_MAC_ADMIN)) rc = -EPERM; } else @@ -2274,6 +2286,8 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) char *csp = smk_of_current(); char *fetched; char *final; + char trattr[TRANS_TRUE_SIZE]; + int transflag = 0; struct dentry *dp; if (inode == NULL) @@ -2392,10 +2406,19 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) */ dp = dget(opt_dentry); fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp); - if (fetched != NULL) + if (fetched != NULL) { final = fetched; - isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, - dp); + if (S_ISDIR(inode->i_mode)) { + trattr[0] = '\0'; + inode->i_op->getxattr(dp, + XATTR_NAME_SMACKTRANSMUTE, + trattr, TRANS_TRUE_SIZE); + if (strncmp(trattr, TRANS_TRUE, + TRANS_TRUE_SIZE) == 0) + transflag = SMK_INODE_TRANSMUTE; + } + } + isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); dput(dp); break; @@ -2406,7 +2429,7 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) else isp->smk_inode = final; - isp->smk_flags |= SMK_INODE_INSTANT; + isp->smk_flags |= (SMK_INODE_INSTANT | transflag); unlockandout: mutex_unlock(&isp->smk_lock); @@ -2456,6 +2479,7 @@ static int smack_setprocattr(struct task_struct *p, char *name, void *value, size_t size) { struct task_smack *tsp; + struct task_smack *oldtsp; struct cred *new; char *newsmack; @@ -2485,6 +2509,7 @@ static int smack_setprocattr(struct task_struct *p, char *name, if (newsmack == smack_known_web.smk_known) return -EPERM; + oldtsp = p->cred->security; new = prepare_creds(); if (new == NULL) return -ENOMEM; @@ -2494,6 +2519,7 @@ static int smack_setprocattr(struct task_struct *p, char *name, return -ENOMEM; } tsp->smk_task = newsmack; + tsp->smk_forked = oldtsp->smk_forked; new->security = tsp; commit_creds(new); return size; diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c index 01a0be93d8d0..362d5eda948b 100644 --- a/security/smack/smackfs.c +++ b/security/smack/smackfs.c @@ -109,9 +109,12 @@ const char *smack_cipso_option = SMACK_CIPSO_OPTION; * SMK_ACCESSLEN: Maximum length for a rule access field * SMK_LOADLEN: Smack rule length */ -#define SMK_ACCESS "rwxa" -#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) -#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) +#define SMK_OACCESS "rwxa" +#define SMK_ACCESS "rwxat" +#define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1) +#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) +#define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN) +#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) /** * smk_netlabel_audit_set - fill a netlbl_audit struct @@ -175,6 +178,8 @@ static int load_seq_show(struct seq_file *s, void *v) seq_putc(s, 'x'); if (srp->smk_access & MAY_APPEND) seq_putc(s, 'a'); + if (srp->smk_access & MAY_TRANSMUTE) + seq_putc(s, 't'); if (srp->smk_access == 0) seq_putc(s, '-'); @@ -273,10 +278,15 @@ static ssize_t smk_write_load(struct file *file, const char __user *buf, if (!capable(CAP_MAC_ADMIN)) return -EPERM; - if (*ppos != 0 || count != SMK_LOADLEN) + if (*ppos != 0) + return -EINVAL; + /* + * Minor hack for backward compatability + */ + if (count < (SMK_OLOADLEN) || count > SMK_LOADLEN) return -EINVAL; - data = kzalloc(count, GFP_KERNEL); + data = kzalloc(SMK_LOADLEN, GFP_KERNEL); if (data == NULL) return -ENOMEM; @@ -285,6 +295,12 @@ static ssize_t smk_write_load(struct file *file, const char __user *buf, goto out; } + /* + * More on the minor hack for backward compatability + */ + if (count == (SMK_OLOADLEN)) + data[SMK_OLOADLEN] = '-'; + rule = kzalloc(sizeof(*rule), GFP_KERNEL); if (rule == NULL) { rc = -ENOMEM; @@ -345,6 +361,17 @@ static ssize_t smk_write_load(struct file *file, const char __user *buf, goto out_free_rule; } + switch (data[SMK_LABELLEN + SMK_LABELLEN + 4]) { + case '-': + break; + case 't': + case 'T': + rule->smk_access |= MAY_TRANSMUTE; + break; + default: + goto out_free_rule; + } + rc = smk_set_access(rule); if (!rc) -- cgit v1.2.3 From bc5e0af0b36b6cc9de301074426c279fc9b72675 Mon Sep 17 00:00:00 2001 From: Mimi Zohar Date: Mon, 13 Dec 2010 16:53:10 -0500 Subject: trusted-keys: additional TSS return code and other error handling Previously not all TSS return codes were tested, as they were all eventually caught by the TPM. Now all returns are tested and handled immediately. This patch also fixes memory leaks in error and non-error paths. Signed-off-by: David Safford Acked-by: Mimi Zohar Acked-by: David Howells Acked-by: Serge E. Hallyn Signed-off-by: James Morris --- security/keys/trusted_defined.c | 149 +++++++++++++++++++++++----------------- 1 file changed, 87 insertions(+), 62 deletions(-) (limited to 'security') diff --git a/security/keys/trusted_defined.c b/security/keys/trusted_defined.c index aaaa069967a6..3dc3db15b5d9 100644 --- a/security/keys/trusted_defined.c +++ b/security/keys/trusted_defined.c @@ -108,7 +108,8 @@ static int TSS_rawhmac(unsigned char *digest, const unsigned char *key, goto out; } va_end(argp); - ret = crypto_shash_final(&sdesc->shash, digest); + if (!ret) + ret = crypto_shash_final(&sdesc->shash, digest); out: kfree(sdesc); return ret; @@ -117,9 +118,9 @@ out: /* * calculate authorization info fields to send to TPM */ -static uint32_t TSS_authhmac(unsigned char *digest, const unsigned char *key, - const unsigned int keylen, unsigned char *h1, - unsigned char *h2, unsigned char h3, ...) +static int TSS_authhmac(unsigned char *digest, const unsigned char *key, + const unsigned int keylen, unsigned char *h1, + unsigned char *h2, unsigned char h3, ...) { unsigned char paramdigest[SHA1_DIGEST_SIZE]; struct sdesc *sdesc; @@ -146,15 +147,17 @@ static uint32_t TSS_authhmac(unsigned char *digest, const unsigned char *key, break; data = va_arg(argp, unsigned char *); ret = crypto_shash_update(&sdesc->shash, data, dlen); - if (ret < 0) + if (ret < 0) { + va_end(argp); goto out; + } } va_end(argp); ret = crypto_shash_final(&sdesc->shash, paramdigest); if (!ret) - TSS_rawhmac(digest, key, keylen, SHA1_DIGEST_SIZE, - paramdigest, TPM_NONCE_SIZE, h1, - TPM_NONCE_SIZE, h2, 1, &c, 0, 0); + ret = TSS_rawhmac(digest, key, keylen, SHA1_DIGEST_SIZE, + paramdigest, TPM_NONCE_SIZE, h1, + TPM_NONCE_SIZE, h2, 1, &c, 0, 0); out: kfree(sdesc); return ret; @@ -163,11 +166,11 @@ out: /* * verify the AUTH1_COMMAND (Seal) result from TPM */ -static uint32_t TSS_checkhmac1(unsigned char *buffer, - const uint32_t command, - const unsigned char *ononce, - const unsigned char *key, - const unsigned int keylen, ...) +static int TSS_checkhmac1(unsigned char *buffer, + const uint32_t command, + const unsigned char *ononce, + const unsigned char *key, + const unsigned int keylen, ...) { uint32_t bufsize; uint16_t tag; @@ -219,18 +222,22 @@ static uint32_t TSS_checkhmac1(unsigned char *buffer, break; dpos = va_arg(argp, unsigned int); ret = crypto_shash_update(&sdesc->shash, buffer + dpos, dlen); - if (ret < 0) + if (ret < 0) { + va_end(argp); goto out; + } } va_end(argp); ret = crypto_shash_final(&sdesc->shash, paramdigest); if (ret < 0) goto out; + ret = TSS_rawhmac(testhmac, key, keylen, SHA1_DIGEST_SIZE, paramdigest, TPM_NONCE_SIZE, enonce, TPM_NONCE_SIZE, ononce, 1, continueflag, 0, 0); if (ret < 0) goto out; + if (memcmp(testhmac, authdata, SHA1_DIGEST_SIZE)) ret = -EINVAL; out: @@ -241,13 +248,13 @@ out: /* * verify the AUTH2_COMMAND (unseal) result from TPM */ -static uint32_t TSS_checkhmac2(unsigned char *buffer, - const uint32_t command, - const unsigned char *ononce, - const unsigned char *key1, - const unsigned int keylen1, - const unsigned char *key2, - const unsigned int keylen2, ...) +static int TSS_checkhmac2(unsigned char *buffer, + const uint32_t command, + const unsigned char *ononce, + const unsigned char *key1, + const unsigned int keylen1, + const unsigned char *key2, + const unsigned int keylen2, ...) { uint32_t bufsize; uint16_t tag; @@ -309,9 +316,12 @@ static uint32_t TSS_checkhmac2(unsigned char *buffer, break; dpos = va_arg(argp, unsigned int); ret = crypto_shash_update(&sdesc->shash, buffer + dpos, dlen); - if (ret < 0) + if (ret < 0) { + va_end(argp); goto out; + } } + va_end(argp); ret = crypto_shash_final(&sdesc->shash, paramdigest); if (ret < 0) goto out; @@ -319,6 +329,8 @@ static uint32_t TSS_checkhmac2(unsigned char *buffer, ret = TSS_rawhmac(testhmac1, key1, keylen1, SHA1_DIGEST_SIZE, paramdigest, TPM_NONCE_SIZE, enonce1, TPM_NONCE_SIZE, ononce, 1, continueflag1, 0, 0); + if (ret < 0) + goto out; if (memcmp(testhmac1, authdata1, SHA1_DIGEST_SIZE)) { ret = -EINVAL; goto out; @@ -326,6 +338,8 @@ static uint32_t TSS_checkhmac2(unsigned char *buffer, ret = TSS_rawhmac(testhmac2, key2, keylen2, SHA1_DIGEST_SIZE, paramdigest, TPM_NONCE_SIZE, enonce2, TPM_NONCE_SIZE, ononce, 1, continueflag2, 0, 0); + if (ret < 0) + goto out; if (memcmp(testhmac2, authdata2, SHA1_DIGEST_SIZE)) ret = -EINVAL; out: @@ -364,8 +378,8 @@ static int tpm_get_random(struct tpm_buf *tb, unsigned char *buf, uint32_t len) store32(tb, TPM_ORD_GETRANDOM); store32(tb, len); ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, sizeof tb->data); - memcpy(buf, tb->data + TPM_GETRANDOM_SIZE, len); - + if (!ret) + memcpy(buf, tb->data + TPM_GETRANDOM_SIZE, len); return ret; } @@ -392,10 +406,13 @@ static int my_get_random(unsigned char *buf, int len) static int pcrlock(const int pcrnum) { unsigned char hash[SHA1_DIGEST_SIZE]; + int ret; if (!capable(CAP_SYS_ADMIN)) return -EPERM; - my_get_random(hash, SHA1_DIGEST_SIZE); + ret = my_get_random(hash, SHA1_DIGEST_SIZE); + if (ret < 0) + return ret; return tpm_pcr_extend(TPM_ANY_NUM, pcrnum, hash) ? -EINVAL : 0; } @@ -431,9 +448,8 @@ static int osap(struct tpm_buf *tb, struct osapsess *s, TPM_NONCE_SIZE); memcpy(enonce, &(tb->data[TPM_DATA_OFFSET + sizeof(uint32_t) + TPM_NONCE_SIZE]), TPM_NONCE_SIZE); - ret = TSS_rawhmac(s->secret, key, SHA1_DIGEST_SIZE, TPM_NONCE_SIZE, - enonce, TPM_NONCE_SIZE, ononce, 0, 0); - return ret; + return TSS_rawhmac(s->secret, key, SHA1_DIGEST_SIZE, TPM_NONCE_SIZE, + enonce, TPM_NONCE_SIZE, ononce, 0, 0); } /* @@ -454,7 +470,7 @@ static int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce) *handle = LOAD32(tb->data, TPM_DATA_OFFSET); memcpy(nonce, &tb->data[TPM_DATA_OFFSET + sizeof(uint32_t)], TPM_NONCE_SIZE); - return ret; + return 0; } struct tpm_digests { @@ -521,20 +537,23 @@ static int tpm_seal(struct tpm_buf *tb, const uint16_t keytype, /* calculate authorization HMAC value */ if (pcrinfosize == 0) { /* no pcr info specified */ - TSS_authhmac(td->pubauth, sess.secret, SHA1_DIGEST_SIZE, - sess.enonce, td->nonceodd, cont, sizeof(uint32_t), - &ordinal, SHA1_DIGEST_SIZE, td->encauth, - sizeof(uint32_t), &pcrsize, sizeof(uint32_t), - &datsize, datalen, data, 0, 0); + ret = TSS_authhmac(td->pubauth, sess.secret, SHA1_DIGEST_SIZE, + sess.enonce, td->nonceodd, cont, + sizeof(uint32_t), &ordinal, SHA1_DIGEST_SIZE, + td->encauth, sizeof(uint32_t), &pcrsize, + sizeof(uint32_t), &datsize, datalen, data, 0, + 0); } else { /* pcr info specified */ - TSS_authhmac(td->pubauth, sess.secret, SHA1_DIGEST_SIZE, - sess.enonce, td->nonceodd, cont, sizeof(uint32_t), - &ordinal, SHA1_DIGEST_SIZE, td->encauth, - sizeof(uint32_t), &pcrsize, pcrinfosize, - pcrinfo, sizeof(uint32_t), &datsize, datalen, - data, 0, 0); + ret = TSS_authhmac(td->pubauth, sess.secret, SHA1_DIGEST_SIZE, + sess.enonce, td->nonceodd, cont, + sizeof(uint32_t), &ordinal, SHA1_DIGEST_SIZE, + td->encauth, sizeof(uint32_t), &pcrsize, + pcrinfosize, pcrinfo, sizeof(uint32_t), + &datsize, datalen, data, 0, 0); } + if (ret < 0) + return ret; /* build and send the TPM request packet */ INIT_BUF(tb); @@ -569,8 +588,10 @@ static int tpm_seal(struct tpm_buf *tb, const uint16_t keytype, 0); /* copy the returned blob to caller */ - memcpy(blob, tb->data + TPM_DATA_OFFSET, storedsize); - *bloblen = storedsize; + if (!ret) { + memcpy(blob, tb->data + TPM_DATA_OFFSET, storedsize); + *bloblen = storedsize; + } return ret; } @@ -614,12 +635,16 @@ static int tpm_unseal(struct tpm_buf *tb, pr_info("trusted_key: tpm_get_random failed (%d)\n", ret); return ret; } - TSS_authhmac(authdata1, keyauth, TPM_NONCE_SIZE, - enonce1, nonceodd, cont, sizeof(uint32_t), - &ordinal, bloblen, blob, 0, 0); - TSS_authhmac(authdata2, blobauth, TPM_NONCE_SIZE, - enonce2, nonceodd, cont, sizeof(uint32_t), - &ordinal, bloblen, blob, 0, 0); + ret = TSS_authhmac(authdata1, keyauth, TPM_NONCE_SIZE, + enonce1, nonceodd, cont, sizeof(uint32_t), + &ordinal, bloblen, blob, 0, 0); + if (ret < 0) + return ret; + ret = TSS_authhmac(authdata2, blobauth, TPM_NONCE_SIZE, + enonce2, nonceodd, cont, sizeof(uint32_t), + &ordinal, bloblen, blob, 0, 0); + if (ret < 0) + return ret; /* build and send TPM request packet */ INIT_BUF(tb); @@ -650,10 +675,12 @@ static int tpm_unseal(struct tpm_buf *tb, sizeof(uint32_t), TPM_DATA_OFFSET, *datalen, TPM_DATA_OFFSET + sizeof(uint32_t), 0, 0); - if (ret < 0) + if (ret < 0) { pr_info("trusted_key: TSS_checkhmac2 failed (%d)\n", ret); + return ret; + } memcpy(data, tb->data + TPM_DATA_OFFSET + sizeof(uint32_t), *datalen); - return ret; + return 0; } /* @@ -697,11 +724,11 @@ static int key_unseal(struct trusted_key_payload *p, ret = tpm_unseal(tb, o->keyhandle, o->keyauth, p->blob, p->blob_len, o->blobauth, p->key, &p->key_len); - /* pull migratable flag out of sealed key */ - p->migratable = p->key[--p->key_len]; - if (ret < 0) pr_info("trusted_key: srkunseal failed (%d)\n", ret); + else + /* pull migratable flag out of sealed key */ + p->migratable = p->key[--p->key_len]; kfree(tb); return ret; @@ -854,12 +881,11 @@ static struct trusted_key_options *trusted_options_alloc(void) struct trusted_key_options *options; options = kzalloc(sizeof *options, GFP_KERNEL); - if (!options) - return options; - - /* set any non-zero defaults */ - options->keytype = SRK_keytype; - options->keyhandle = SRKHANDLE; + if (options) { + /* set any non-zero defaults */ + options->keytype = SRK_keytype; + options->keyhandle = SRKHANDLE; + } return options; } @@ -872,9 +898,8 @@ static struct trusted_key_payload *trusted_payload_alloc(struct key *key) if (ret < 0) return p; p = kzalloc(sizeof *p, GFP_KERNEL); - - /* migratable by default */ - p->migratable = 1; + if (p) + p->migratable = 1; /* migratable by default */ return p; } -- cgit v1.2.3 From 1bdbb4024c309e470711b434a24fb356fc92edea Mon Sep 17 00:00:00 2001 From: Mimi Zohar Date: Mon, 13 Dec 2010 16:53:11 -0500 Subject: trusted-keys: kzalloc and other cleanup Cleanup based on David Howells suggestions: - replace kzalloc, where possible, with kmalloc - revert 'const unsigned int' definitions to 'unsigned int' Signed-off-by: David Safford Acked-by: Mimi Zohar Acked-by: David Howells Signed-off-by: James Morris --- security/keys/trusted_defined.c | 34 ++++++++++++++++------------------ 1 file changed, 16 insertions(+), 18 deletions(-) (limited to 'security') diff --git a/security/keys/trusted_defined.c b/security/keys/trusted_defined.c index 3dc3db15b5d9..975e9f29a52c 100644 --- a/security/keys/trusted_defined.c +++ b/security/keys/trusted_defined.c @@ -56,7 +56,7 @@ static struct sdesc *init_sdesc(struct crypto_shash *alg) return sdesc; } -static int TSS_sha1(const unsigned char *data, const unsigned int datalen, +static int TSS_sha1(const unsigned char *data, unsigned int datalen, unsigned char *digest) { struct sdesc *sdesc; @@ -74,7 +74,7 @@ static int TSS_sha1(const unsigned char *data, const unsigned int datalen, } static int TSS_rawhmac(unsigned char *digest, const unsigned char *key, - const unsigned int keylen, ...) + unsigned int keylen, ...) { struct sdesc *sdesc; va_list argp; @@ -119,7 +119,7 @@ out: * calculate authorization info fields to send to TPM */ static int TSS_authhmac(unsigned char *digest, const unsigned char *key, - const unsigned int keylen, unsigned char *h1, + unsigned int keylen, unsigned char *h1, unsigned char *h2, unsigned char h3, ...) { unsigned char paramdigest[SHA1_DIGEST_SIZE]; @@ -170,7 +170,7 @@ static int TSS_checkhmac1(unsigned char *buffer, const uint32_t command, const unsigned char *ononce, const unsigned char *key, - const unsigned int keylen, ...) + unsigned int keylen, ...) { uint32_t bufsize; uint16_t tag; @@ -252,9 +252,9 @@ static int TSS_checkhmac2(unsigned char *buffer, const uint32_t command, const unsigned char *ononce, const unsigned char *key1, - const unsigned int keylen1, + unsigned int keylen1, const unsigned char *key2, - const unsigned int keylen2, ...) + unsigned int keylen2, ...) { uint32_t bufsize; uint16_t tag; @@ -388,7 +388,7 @@ static int my_get_random(unsigned char *buf, int len) struct tpm_buf *tb; int ret; - tb = kzalloc(sizeof *tb, GFP_KERNEL); + tb = kmalloc(sizeof *tb, GFP_KERNEL); if (!tb) return -ENOMEM; ret = tpm_get_random(tb, buf, len); @@ -420,8 +420,7 @@ static int pcrlock(const int pcrnum) * Create an object specific authorisation protocol (OSAP) session */ static int osap(struct tpm_buf *tb, struct osapsess *s, - const unsigned char *key, const uint16_t type, - const uint32_t handle) + const unsigned char *key, uint16_t type, uint32_t handle) { unsigned char enonce[TPM_NONCE_SIZE]; unsigned char ononce[TPM_NONCE_SIZE]; @@ -485,12 +484,12 @@ struct tpm_digests { * Have the TPM seal(encrypt) the trusted key, possibly based on * Platform Configuration Registers (PCRs). AUTH1 for sealing key. */ -static int tpm_seal(struct tpm_buf *tb, const uint16_t keytype, - const uint32_t keyhandle, const unsigned char *keyauth, - const unsigned char *data, const uint32_t datalen, +static int tpm_seal(struct tpm_buf *tb, uint16_t keytype, + uint32_t keyhandle, const unsigned char *keyauth, + const unsigned char *data, uint32_t datalen, unsigned char *blob, uint32_t *bloblen, const unsigned char *blobauth, - const unsigned char *pcrinfo, const uint32_t pcrinfosize) + const unsigned char *pcrinfo, uint32_t pcrinfosize) { struct osapsess sess; struct tpm_digests *td; @@ -599,8 +598,8 @@ static int tpm_seal(struct tpm_buf *tb, const uint16_t keytype, * use the AUTH2_COMMAND form of unseal, to authorize both key and blob */ static int tpm_unseal(struct tpm_buf *tb, - const uint32_t keyhandle, const unsigned char *keyauth, - const unsigned char *blob, const int bloblen, + uint32_t keyhandle, const unsigned char *keyauth, + const unsigned char *blob, int bloblen, const unsigned char *blobauth, unsigned char *data, unsigned int *datalen) { @@ -913,7 +912,7 @@ static struct trusted_key_payload *trusted_payload_alloc(struct key *key) * On success, return 0. Otherwise return errno. */ static int trusted_instantiate(struct key *key, const void *data, - const size_t datalen) + size_t datalen) { struct trusted_key_payload *payload = NULL; struct trusted_key_options *options = NULL; @@ -996,8 +995,7 @@ static void trusted_rcu_free(struct rcu_head *rcu) /* * trusted_update - reseal an existing key with new PCR values */ -static int trusted_update(struct key *key, const void *data, - const size_t datalen) +static int trusted_update(struct key *key, const void *data, size_t datalen) { struct trusted_key_payload *p = key->payload.data; struct trusted_key_payload *new_p; -- cgit v1.2.3 From 1f35065a9e2573427ce3fd6c4a40b355c2ddfb92 Mon Sep 17 00:00:00 2001 From: Mimi Zohar Date: Mon, 13 Dec 2010 16:53:12 -0500 Subject: encrypted-keys: verify datablob size before converting to binary Verify the hex ascii datablob length is correct before converting the IV, encrypted data, and HMAC to binary. Reported-by: David Howells Signed-off-by: Mimi Zohar Acked-by: David Howells Signed-off-by: James Morris --- security/keys/encrypted_defined.c | 29 +++++++++++++++-------------- 1 file changed, 15 insertions(+), 14 deletions(-) (limited to 'security') diff --git a/security/keys/encrypted_defined.c b/security/keys/encrypted_defined.c index 3f4085703e6c..d653e991c694 100644 --- a/security/keys/encrypted_defined.c +++ b/security/keys/encrypted_defined.c @@ -129,8 +129,7 @@ out: * On success returns 0, otherwise -EINVAL. */ static int datablob_parse(char *datablob, char **master_desc, - char **decrypted_datalen, char **hex_encoded_iv, - char **hex_encoded_data) + char **decrypted_datalen, char **hex_encoded_iv) { substring_t args[MAX_OPT_ARGS]; int ret = -EINVAL; @@ -167,7 +166,6 @@ static int datablob_parse(char *datablob, char **master_desc, *hex_encoded_iv = strsep(&datablob, " \t"); if (!*hex_encoded_iv) break; - *hex_encoded_data = *hex_encoded_iv + (2 * ivsize) + 2; ret = 0; break; case Opt_update: @@ -558,18 +556,24 @@ static struct encrypted_key_payload *encrypted_key_alloc(struct key *key, } static int encrypted_key_decrypt(struct encrypted_key_payload *epayload, - const char *hex_encoded_iv, - const char *hex_encoded_data) + const char *hex_encoded_iv) { struct key *mkey; u8 derived_key[HASH_SIZE]; u8 *master_key; u8 *hmac; + const char *hex_encoded_data; unsigned int master_keylen; unsigned int encrypted_datalen; + size_t asciilen; int ret; encrypted_datalen = roundup(epayload->decrypted_datalen, blksize); + asciilen = (ivsize + 1 + encrypted_datalen + HASH_SIZE) * 2; + if (strlen(hex_encoded_iv) != asciilen) + return -EINVAL; + + hex_encoded_data = hex_encoded_iv + (2 * ivsize) + 2; hex2bin(epayload->iv, hex_encoded_iv, ivsize); hex2bin(epayload->encrypted_data, hex_encoded_data, encrypted_datalen); @@ -620,20 +624,18 @@ static void __ekey_init(struct encrypted_key_payload *epayload, */ static int encrypted_init(struct encrypted_key_payload *epayload, const char *master_desc, const char *datalen, - const char *hex_encoded_iv, - const char *hex_encoded_data) + const char *hex_encoded_iv) { int ret = 0; __ekey_init(epayload, master_desc, datalen); - if (!hex_encoded_data) { + if (!hex_encoded_iv) { get_random_bytes(epayload->iv, ivsize); get_random_bytes(epayload->decrypted_data, epayload->decrypted_datalen); } else - ret = encrypted_key_decrypt(epayload, hex_encoded_iv, - hex_encoded_data); + ret = encrypted_key_decrypt(epayload, hex_encoded_iv); return ret; } @@ -653,7 +655,6 @@ static int encrypted_instantiate(struct key *key, const void *data, char *master_desc = NULL; char *decrypted_datalen = NULL; char *hex_encoded_iv = NULL; - char *hex_encoded_data = NULL; int ret; if (datalen <= 0 || datalen > 32767 || !data) @@ -665,7 +666,7 @@ static int encrypted_instantiate(struct key *key, const void *data, datablob[datalen] = 0; memcpy(datablob, data, datalen); ret = datablob_parse(datablob, &master_desc, &decrypted_datalen, - &hex_encoded_iv, &hex_encoded_data); + &hex_encoded_iv); if (ret < 0) goto out; @@ -675,7 +676,7 @@ static int encrypted_instantiate(struct key *key, const void *data, goto out; } ret = encrypted_init(epayload, master_desc, decrypted_datalen, - hex_encoded_iv, hex_encoded_data); + hex_encoded_iv); if (ret < 0) { kfree(epayload); goto out; @@ -722,7 +723,7 @@ static int encrypted_update(struct key *key, const void *data, size_t datalen) buf[datalen] = 0; memcpy(buf, data, datalen); - ret = datablob_parse(buf, &new_master_desc, NULL, NULL, NULL); + ret = datablob_parse(buf, &new_master_desc, NULL, NULL); if (ret < 0) goto out; -- cgit v1.2.3 From 3b1826cebe1d534ec05417a29b9a9f82651a5cb5 Mon Sep 17 00:00:00 2001 From: Mimi Zohar Date: Mon, 13 Dec 2010 16:53:13 -0500 Subject: encrypted-keys: style and other cleanup Cleanup based on David Howells suggestions: - use static const char arrays instead of #define - rename init_sdesc to alloc_sdesc - convert 'unsigned int' definitions to 'size_t' - revert remaining 'const unsigned int' definitions to 'unsigned int' Signed-off-by: Mimi Zohar Acked-by: David Howells Signed-off-by: James Morris --- security/keys/encrypted_defined.c | 60 ++++++++++++++++++--------------------- security/keys/encrypted_defined.h | 6 ++-- 2 files changed, 29 insertions(+), 37 deletions(-) (limited to 'security') diff --git a/security/keys/encrypted_defined.c b/security/keys/encrypted_defined.c index d653e991c694..32d27c858388 100644 --- a/security/keys/encrypted_defined.c +++ b/security/keys/encrypted_defined.c @@ -32,21 +32,20 @@ #include "encrypted_defined.h" -#define KEY_TRUSTED_PREFIX "trusted:" -#define KEY_TRUSTED_PREFIX_LEN (sizeof (KEY_TRUSTED_PREFIX) - 1) -#define KEY_USER_PREFIX "user:" -#define KEY_USER_PREFIX_LEN (sizeof (KEY_USER_PREFIX) - 1) - -#define HASH_SIZE SHA256_DIGEST_SIZE -#define MAX_DATA_SIZE 4096 -#define MIN_DATA_SIZE 20 - +static const char KEY_TRUSTED_PREFIX[] = "trusted:"; +static const char KEY_USER_PREFIX[] = "user:"; static const char hash_alg[] = "sha256"; static const char hmac_alg[] = "hmac(sha256)"; static const char blkcipher_alg[] = "cbc(aes)"; static unsigned int ivsize; static int blksize; +#define KEY_TRUSTED_PREFIX_LEN (sizeof (KEY_TRUSTED_PREFIX) - 1) +#define KEY_USER_PREFIX_LEN (sizeof (KEY_USER_PREFIX) - 1) +#define HASH_SIZE SHA256_DIGEST_SIZE +#define MAX_DATA_SIZE 4096 +#define MIN_DATA_SIZE 20 + struct sdesc { struct shash_desc shash; char ctx[]; @@ -217,8 +216,7 @@ out: * data, trusted key type data is not visible decrypted from userspace. */ static struct key *request_trusted_key(const char *trusted_desc, - u8 **master_key, - unsigned int *master_keylen) + u8 **master_key, size_t *master_keylen) { struct trusted_key_payload *tpayload; struct key *tkey; @@ -241,7 +239,7 @@ error: * Use a user provided key to encrypt/decrypt an encrypted-key. */ static struct key *request_user_key(const char *master_desc, u8 **master_key, - unsigned int *master_keylen) + size_t *master_keylen) { struct user_key_payload *upayload; struct key *ukey; @@ -258,7 +256,7 @@ error: return ukey; } -static struct sdesc *init_sdesc(struct crypto_shash *alg) +static struct sdesc *alloc_sdesc(struct crypto_shash *alg) { struct sdesc *sdesc; int size; @@ -272,13 +270,13 @@ static struct sdesc *init_sdesc(struct crypto_shash *alg) return sdesc; } -static int calc_hmac(u8 *digest, const u8 *key, const unsigned int keylen, - const u8 *buf, const unsigned int buflen) +static int calc_hmac(u8 *digest, const u8 *key, unsigned int keylen, + const u8 *buf, unsigned int buflen) { struct sdesc *sdesc; int ret; - sdesc = init_sdesc(hmacalg); + sdesc = alloc_sdesc(hmacalg); if (IS_ERR(sdesc)) { pr_info("encrypted_key: can't alloc %s\n", hmac_alg); return PTR_ERR(sdesc); @@ -291,12 +289,12 @@ static int calc_hmac(u8 *digest, const u8 *key, const unsigned int keylen, return ret; } -static int calc_hash(u8 *digest, const u8 *buf, const unsigned int buflen) +static int calc_hash(u8 *digest, const u8 *buf, unsigned int buflen) { struct sdesc *sdesc; int ret; - sdesc = init_sdesc(hashalg); + sdesc = alloc_sdesc(hashalg); if (IS_ERR(sdesc)) { pr_info("encrypted_key: can't alloc %s\n", hash_alg); return PTR_ERR(sdesc); @@ -311,8 +309,7 @@ enum derived_key_type { ENC_KEY, AUTH_KEY }; /* Derive authentication/encryption key from trusted key */ static int get_derived_key(u8 *derived_key, enum derived_key_type key_type, - const u8 *master_key, - const unsigned int master_keylen) + const u8 *master_key, size_t master_keylen) { u8 *derived_buf; unsigned int derived_buf_len; @@ -340,8 +337,8 @@ static int get_derived_key(u8 *derived_key, enum derived_key_type key_type, } static int init_blkcipher_desc(struct blkcipher_desc *desc, const u8 *key, - const unsigned int key_len, const u8 *iv, - const unsigned int ivsize) + unsigned int key_len, const u8 *iv, + unsigned int ivsize) { int ret; @@ -364,8 +361,7 @@ static int init_blkcipher_desc(struct blkcipher_desc *desc, const u8 *key, } static struct key *request_master_key(struct encrypted_key_payload *epayload, - u8 **master_key, - unsigned int *master_keylen) + u8 **master_key, size_t *master_keylen) { struct key *mkey = NULL; @@ -394,7 +390,7 @@ out: /* Before returning data to userspace, encrypt decrypted data. */ static int derived_key_encrypt(struct encrypted_key_payload *epayload, const u8 *derived_key, - const unsigned int derived_keylen) + unsigned int derived_keylen) { struct scatterlist sg_in[2]; struct scatterlist sg_out[1]; @@ -433,8 +429,7 @@ out: } static int datablob_hmac_append(struct encrypted_key_payload *epayload, - const u8 *master_key, - const unsigned int master_keylen) + const u8 *master_key, size_t master_keylen) { u8 derived_key[HASH_SIZE]; u8 *digest; @@ -455,8 +450,7 @@ out: /* verify HMAC before decrypting encrypted key */ static int datablob_hmac_verify(struct encrypted_key_payload *epayload, - const u8 *master_key, - const unsigned int master_keylen) + const u8 *master_key, size_t master_keylen) { u8 derived_key[HASH_SIZE]; u8 digest[HASH_SIZE]; @@ -485,7 +479,7 @@ out: static int derived_key_decrypt(struct encrypted_key_payload *epayload, const u8 *derived_key, - const unsigned int derived_keylen) + unsigned int derived_keylen) { struct scatterlist sg_in[1]; struct scatterlist sg_out[2]; @@ -506,7 +500,7 @@ static int derived_key_decrypt(struct encrypted_key_payload *epayload, sg_init_table(sg_out, 2); sg_set_buf(sg_in, epayload->encrypted_data, encrypted_datalen); sg_set_buf(&sg_out[0], epayload->decrypted_data, - (unsigned int)epayload->decrypted_datalen); + epayload->decrypted_datalen); sg_set_buf(&sg_out[1], pad, sizeof pad); ret = crypto_blkcipher_decrypt(&desc, sg_out, sg_in, encrypted_datalen); @@ -563,8 +557,8 @@ static int encrypted_key_decrypt(struct encrypted_key_payload *epayload, u8 *master_key; u8 *hmac; const char *hex_encoded_data; - unsigned int master_keylen; unsigned int encrypted_datalen; + size_t master_keylen; size_t asciilen; int ret; @@ -765,7 +759,7 @@ static long encrypted_read(const struct key *key, char __user *buffer, struct encrypted_key_payload *epayload; struct key *mkey; u8 *master_key; - unsigned int master_keylen; + size_t master_keylen; char derived_key[HASH_SIZE]; char *ascii_buf; size_t asciiblob_len; diff --git a/security/keys/encrypted_defined.h b/security/keys/encrypted_defined.h index c298a3f1cf70..cef5e2f2b7d1 100644 --- a/security/keys/encrypted_defined.h +++ b/security/keys/encrypted_defined.h @@ -4,8 +4,7 @@ #define ENCRYPTED_DEBUG 0 #if ENCRYPTED_DEBUG -static inline void dump_master_key(const u8 *master_key, - unsigned int master_keylen) +static inline void dump_master_key(const u8 *master_key, size_t master_keylen) { print_hex_dump(KERN_ERR, "master key: ", DUMP_PREFIX_NONE, 32, 1, master_key, master_keylen, 0); @@ -34,8 +33,7 @@ static inline void dump_hmac(const char *str, const u8 *digest, hmac_size, 0); } #else -static inline void dump_master_key(const u8 *master_key, - unsigned int master_keylen) +static inline void dump_master_key(const u8 *master_key, size_t master_keylen) { } -- cgit v1.2.3 From 350e4f31e0eaf56dfc3b328d24a11bdf42a41fb8 Mon Sep 17 00:00:00 2001 From: Eric Paris Date: Thu, 16 Dec 2010 11:46:51 -0500 Subject: SELinux: define permissions for DCB netlink messages Commit 2f90b865 added two new netlink message types to the netlink route socket. SELinux has hooks to define if netlink messages are allowed to be sent or received, but it did not know about these two new message types. By default we allow such actions so noone likely noticed. This patch adds the proper definitions and thus proper permissions enforcement. Signed-off-by: Eric Paris --- security/selinux/nlmsgtab.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'security') diff --git a/security/selinux/nlmsgtab.c b/security/selinux/nlmsgtab.c index 75ec0c6ebacd..8b02b2137da2 100644 --- a/security/selinux/nlmsgtab.c +++ b/security/selinux/nlmsgtab.c @@ -65,6 +65,8 @@ static struct nlmsg_perm nlmsg_route_perms[] = { RTM_NEWADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, { RTM_DELADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, { RTM_GETADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_READ }, + { RTM_GETDCB, NETLINK_ROUTE_SOCKET__NLMSG_READ }, + { RTM_SETDCB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, }; static struct nlmsg_perm nlmsg_firewall_perms[] = -- cgit v1.2.3