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author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-12-28 15:05:13 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-12-28 15:05:13 -0800 |
commit | 75f95da078b2891cd186f074ffc15a8e7c3f082d (patch) | |
tree | 2ba8da10d0d1e20565e893a777d4349fe9d483dd /security/keys/encrypted-keys | |
parent | 4ed7bdc1eb4c82cf4bfdf6a94dd36fd695f6f387 (diff) | |
parent | 4b5f747e82b12b6d8ab815fc259827a615c7f2c3 (diff) | |
download | linux-75f95da078b2891cd186f074ffc15a8e7c3f082d.tar.bz2 |
Merge tag 'libnvdimm-for-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
Pull libnvdimm updates from Dan Williams:
"The vast bulk of this update is the new support for the security
capabilities of some nvdimms.
The userspace tooling for this capability is still a work in progress,
but the changes survive the existing libnvdimm unit tests. The changes
also pass manual checkout on hardware and the new nfit_test emulation
of the security capability.
The touches of the security/keys/ files have received the necessary
acks from Mimi and David. Those changes were necessary to allow for a
new generic encrypted-key type, and allow the nvdimm sub-system to
lookup key material referenced by the libnvdimm-sysfs interface.
Summary:
- Add support for the security features of nvdimm devices that
implement a security model similar to ATA hard drive security. The
security model supports locking access to the media at
device-power-loss, to be unlocked with a passphrase, and
secure-erase (crypto-scramble).
Unlike the ATA security case where the kernel expects device
security to be managed in a pre-OS environment, the libnvdimm
security implementation allows key provisioning and key-operations
at OS runtime. Keys are managed with the kernel's encrypted-keys
facility to provide data-at-rest security for the libnvdimm key
material. The usage model mirrors fscrypt key management, but is
driven via libnvdimm sysfs.
- Miscellaneous updates for api usage and comment fixes"
* tag 'libnvdimm-for-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: (21 commits)
libnvdimm/security: Quiet security operations
libnvdimm/security: Add documentation for nvdimm security support
tools/testing/nvdimm: add Intel DSM 1.8 support for nfit_test
tools/testing/nvdimm: Add overwrite support for nfit_test
tools/testing/nvdimm: Add test support for Intel nvdimm security DSMs
acpi/nfit, libnvdimm/security: add Intel DSM 1.8 master passphrase support
acpi/nfit, libnvdimm/security: Add security DSM overwrite support
acpi/nfit, libnvdimm: Add support for issue secure erase DSM to Intel nvdimm
acpi/nfit, libnvdimm: Add enable/update passphrase support for Intel nvdimms
acpi/nfit, libnvdimm: Add disable passphrase support to Intel nvdimm.
acpi/nfit, libnvdimm: Add unlock of nvdimm support for Intel DIMMs
acpi/nfit, libnvdimm: Add freeze security support to Intel nvdimm
acpi/nfit, libnvdimm: Introduce nvdimm_security_ops
keys-encrypted: add nvdimm key format type to encrypted keys
keys: Export lookup_user_key to external users
acpi/nfit, libnvdimm: Store dimm id as a member to struct nvdimm
libnvdimm, namespace: Replace kmemdup() with kstrndup()
libnvdimm, label: Switch to bitmap_zalloc()
ACPI/nfit: Adjust annotation for why return 0 if fail to find NFIT at start
libnvdimm, bus: Check id immediately following ida_simple_get
...
Diffstat (limited to 'security/keys/encrypted-keys')
-rw-r--r-- | security/keys/encrypted-keys/encrypted.c | 29 |
1 files changed, 20 insertions, 9 deletions
diff --git a/security/keys/encrypted-keys/encrypted.c b/security/keys/encrypted-keys/encrypted.c index a3891ae9fa0f..389a298274d3 100644 --- a/security/keys/encrypted-keys/encrypted.c +++ b/security/keys/encrypted-keys/encrypted.c @@ -45,6 +45,7 @@ static const char hmac_alg[] = "hmac(sha256)"; static const char blkcipher_alg[] = "cbc(aes)"; static const char key_format_default[] = "default"; static const char key_format_ecryptfs[] = "ecryptfs"; +static const char key_format_enc32[] = "enc32"; static unsigned int ivsize; static int blksize; @@ -54,6 +55,7 @@ static int blksize; #define HASH_SIZE SHA256_DIGEST_SIZE #define MAX_DATA_SIZE 4096 #define MIN_DATA_SIZE 20 +#define KEY_ENC32_PAYLOAD_LEN 32 static struct crypto_shash *hash_tfm; @@ -62,12 +64,13 @@ enum { }; enum { - Opt_error = -1, Opt_default, Opt_ecryptfs + Opt_error = -1, Opt_default, Opt_ecryptfs, Opt_enc32 }; static const match_table_t key_format_tokens = { {Opt_default, "default"}, {Opt_ecryptfs, "ecryptfs"}, + {Opt_enc32, "enc32"}, {Opt_error, NULL} }; @@ -195,6 +198,7 @@ static int datablob_parse(char *datablob, const char **format, key_format = match_token(p, key_format_tokens, args); switch (key_format) { case Opt_ecryptfs: + case Opt_enc32: case Opt_default: *format = p; *master_desc = strsep(&datablob, " \t"); @@ -625,15 +629,22 @@ static struct encrypted_key_payload *encrypted_key_alloc(struct key *key, format_len = (!format) ? strlen(key_format_default) : strlen(format); decrypted_datalen = dlen; payload_datalen = decrypted_datalen; - if (format && !strcmp(format, key_format_ecryptfs)) { - if (dlen != ECRYPTFS_MAX_KEY_BYTES) { - pr_err("encrypted_key: keylen for the ecryptfs format " - "must be equal to %d bytes\n", - ECRYPTFS_MAX_KEY_BYTES); - return ERR_PTR(-EINVAL); + if (format) { + if (!strcmp(format, key_format_ecryptfs)) { + if (dlen != ECRYPTFS_MAX_KEY_BYTES) { + pr_err("encrypted_key: keylen for the ecryptfs format must be equal to %d bytes\n", + ECRYPTFS_MAX_KEY_BYTES); + return ERR_PTR(-EINVAL); + } + decrypted_datalen = ECRYPTFS_MAX_KEY_BYTES; + payload_datalen = sizeof(struct ecryptfs_auth_tok); + } else if (!strcmp(format, key_format_enc32)) { + if (decrypted_datalen != KEY_ENC32_PAYLOAD_LEN) { + pr_err("encrypted_key: enc32 key payload incorrect length: %d\n", + decrypted_datalen); + return ERR_PTR(-EINVAL); + } } - decrypted_datalen = ECRYPTFS_MAX_KEY_BYTES; - payload_datalen = sizeof(struct ecryptfs_auth_tok); } encrypted_datalen = roundup(decrypted_datalen, blksize); |