diff options
Diffstat (limited to 'net/sunrpc/auth_gss/gss_krb5_crypto.c')
| -rw-r--r-- | net/sunrpc/auth_gss/gss_krb5_crypto.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/net/sunrpc/auth_gss/gss_krb5_crypto.c b/net/sunrpc/auth_gss/gss_krb5_crypto.c new file mode 100644 index 000000000000..24c21f2a33a7 --- /dev/null +++ b/net/sunrpc/auth_gss/gss_krb5_crypto.c @@ -0,0 +1,209 @@ +/* + * linux/net/sunrpc/gss_krb5_crypto.c + * + * Copyright (c) 2000 The Regents of the University of Michigan. + * All rights reserved. + * + * Andy Adamson <andros@umich.edu> + * Bruce Fields <bfields@umich.edu> + */ + +/* + * Copyright (C) 1998 by the FundsXpress, INC. + * + * All rights reserved. + * + * Export of this software from the United States of America may require + * a specific license from the United States Government. It is the + * responsibility of any person or organization contemplating export to + * obtain such a license before exporting. + * + * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and + * distribute this software and its documentation for any purpose and + * without fee is hereby granted, provided that the above copyright + * notice appear in all copies and that both that copyright notice and + * this permission notice appear in supporting documentation, and that + * the name of FundsXpress. not be used in advertising or publicity pertaining + * to distribution of the software without specific, written prior + * permission. FundsXpress makes no representations about the suitability of + * this software for any purpose. It is provided "as is" without express + * or implied warranty. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. + */ + +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <asm/scatterlist.h> +#include <linux/crypto.h> +#include <linux/highmem.h> +#include <linux/pagemap.h> +#include <linux/sunrpc/gss_krb5.h> + +#ifdef RPC_DEBUG +# define RPCDBG_FACILITY RPCDBG_AUTH +#endif + +u32 +krb5_encrypt( + struct crypto_tfm *tfm, + void * iv, + void * in, + void * out, + int length) +{ + u32 ret = -EINVAL; + struct scatterlist sg[1]; + u8 local_iv[16] = {0}; + + dprintk("RPC: krb5_encrypt: input data:\n"); + print_hexl((u32 *)in, length, 0); + + if (length % crypto_tfm_alg_blocksize(tfm) != 0) + goto out; + + if (crypto_tfm_alg_ivsize(tfm) > 16) { + dprintk("RPC: gss_k5encrypt: tfm iv size to large %d\n", + crypto_tfm_alg_ivsize(tfm)); + goto out; + } + + if (iv) + memcpy(local_iv, iv, crypto_tfm_alg_ivsize(tfm)); + + memcpy(out, in, length); + sg[0].page = virt_to_page(out); + sg[0].offset = offset_in_page(out); + sg[0].length = length; + + ret = crypto_cipher_encrypt_iv(tfm, sg, sg, length, local_iv); + + dprintk("RPC: krb5_encrypt: output data:\n"); + print_hexl((u32 *)out, length, 0); +out: + dprintk("RPC: krb5_encrypt returns %d\n",ret); + return(ret); +} + +EXPORT_SYMBOL(krb5_encrypt); + +u32 +krb5_decrypt( + struct crypto_tfm *tfm, + void * iv, + void * in, + void * out, + int length) +{ + u32 ret = -EINVAL; + struct scatterlist sg[1]; + u8 local_iv[16] = {0}; + + dprintk("RPC: krb5_decrypt: input data:\n"); + print_hexl((u32 *)in, length, 0); + + if (length % crypto_tfm_alg_blocksize(tfm) != 0) + goto out; + + if (crypto_tfm_alg_ivsize(tfm) > 16) { + dprintk("RPC: gss_k5decrypt: tfm iv size to large %d\n", + crypto_tfm_alg_ivsize(tfm)); + goto out; + } + if (iv) + memcpy(local_iv,iv, crypto_tfm_alg_ivsize(tfm)); + + memcpy(out, in, length); + sg[0].page = virt_to_page(out); + sg[0].offset = offset_in_page(out); + sg[0].length = length; + + ret = crypto_cipher_decrypt_iv(tfm, sg, sg, length, local_iv); + + dprintk("RPC: krb5_decrypt: output_data:\n"); + print_hexl((u32 *)out, length, 0); +out: + dprintk("RPC: gss_k5decrypt returns %d\n",ret); + return(ret); +} + +EXPORT_SYMBOL(krb5_decrypt); + +static void +buf_to_sg(struct scatterlist *sg, char *ptr, int len) { + sg->page = virt_to_page(ptr); + sg->offset = offset_in_page(ptr); + sg->length = len; +} + +/* checksum the plaintext data and hdrlen bytes of the token header */ +s32 +make_checksum(s32 cksumtype, char *header, int hdrlen, struct xdr_buf *body, + struct xdr_netobj *cksum) +{ + char *cksumname; + struct crypto_tfm *tfm = NULL; /* XXX add to ctx? */ + struct scatterlist sg[1]; + u32 code = GSS_S_FAILURE; + int len, thislen, offset; + int i; + + switch (cksumtype) { + case CKSUMTYPE_RSA_MD5: + cksumname = "md5"; + break; + default: + dprintk("RPC: krb5_make_checksum:" + " unsupported checksum %d", cksumtype); + goto out; + } + if (!(tfm = crypto_alloc_tfm(cksumname, 0))) + goto out; + cksum->len = crypto_tfm_alg_digestsize(tfm); + if ((cksum->data = kmalloc(cksum->len, GFP_KERNEL)) == NULL) + goto out; + + crypto_digest_init(tfm); + buf_to_sg(sg, header, hdrlen); + crypto_digest_update(tfm, sg, 1); + if (body->head[0].iov_len) { + buf_to_sg(sg, body->head[0].iov_base, body->head[0].iov_len); + crypto_digest_update(tfm, sg, 1); + } + + len = body->page_len; + if (len != 0) { + offset = body->page_base & (PAGE_CACHE_SIZE - 1); + i = body->page_base >> PAGE_CACHE_SHIFT; + thislen = PAGE_CACHE_SIZE - offset; + do { + if (thislen > len) + thislen = len; + sg->page = body->pages[i]; + sg->offset = offset; + sg->length = thislen; + kmap(sg->page); /* XXX kmap_atomic? */ + crypto_digest_update(tfm, sg, 1); + kunmap(sg->page); + len -= thislen; + i++; + offset = 0; + thislen = PAGE_CACHE_SIZE; + } while(len != 0); + } + if (body->tail[0].iov_len) { + buf_to_sg(sg, body->tail[0].iov_base, body->tail[0].iov_len); + crypto_digest_update(tfm, sg, 1); + } + crypto_digest_final(tfm, cksum->data); + code = 0; +out: + if (tfm) + crypto_free_tfm(tfm); + return code; +} + +EXPORT_SYMBOL(make_checksum); |