diff options
Diffstat (limited to 'net/sunrpc/auth_gss/gss_krb5_seqnum.c')
| -rw-r--r-- | net/sunrpc/auth_gss/gss_krb5_seqnum.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/net/sunrpc/auth_gss/gss_krb5_seqnum.c b/net/sunrpc/auth_gss/gss_krb5_seqnum.c new file mode 100644 index 00000000..62ac90c6 --- /dev/null +++ b/net/sunrpc/auth_gss/gss_krb5_seqnum.c @@ -0,0 +1,166 @@ +/* + * linux/net/sunrpc/gss_krb5_seqnum.c + * + * Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/util_seqnum.c + * + * Copyright (c) 2000 The Regents of the University of Michigan. + * All rights reserved. + * + * Andy Adamson <andros@umich.edu> + */ + +/* + * Copyright 1993 by OpenVision Technologies, Inc. + * + * Permission to use, copy, modify, distribute, and sell this software + * and its documentation for any purpose is hereby granted without fee, + * provided that the above copyright notice appears in all copies and + * that both that copyright notice and this permission notice appear in + * supporting documentation, and that the name of OpenVision not be used + * in advertising or publicity pertaining to distribution of the software + * without specific, written prior permission. OpenVision makes no + * representations about the suitability of this software for any + * purpose. It is provided "as is" without express or implied warranty. + * + * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO + * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR + * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF + * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR + * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR + * PERFORMANCE OF THIS SOFTWARE. + */ + +#include <linux/types.h> +#include <linux/sunrpc/gss_krb5.h> +#include <linux/crypto.h> + +#ifdef RPC_DEBUG +# define RPCDBG_FACILITY RPCDBG_AUTH +#endif + +static s32 +krb5_make_rc4_seq_num(struct krb5_ctx *kctx, int direction, s32 seqnum, + unsigned char *cksum, unsigned char *buf) +{ + struct crypto_blkcipher *cipher; + unsigned char plain[8]; + s32 code; + + dprintk("RPC: %s:\n", __func__); + cipher = crypto_alloc_blkcipher(kctx->gk5e->encrypt_name, 0, + CRYPTO_ALG_ASYNC); + if (IS_ERR(cipher)) + return PTR_ERR(cipher); + + plain[0] = (unsigned char) ((seqnum >> 24) & 0xff); + plain[1] = (unsigned char) ((seqnum >> 16) & 0xff); + plain[2] = (unsigned char) ((seqnum >> 8) & 0xff); + plain[3] = (unsigned char) ((seqnum >> 0) & 0xff); + plain[4] = direction; + plain[5] = direction; + plain[6] = direction; + plain[7] = direction; + + code = krb5_rc4_setup_seq_key(kctx, cipher, cksum); + if (code) + goto out; + + code = krb5_encrypt(cipher, cksum, plain, buf, 8); +out: + crypto_free_blkcipher(cipher); + return code; +} +s32 +krb5_make_seq_num(struct krb5_ctx *kctx, + struct crypto_blkcipher *key, + int direction, + u32 seqnum, + unsigned char *cksum, unsigned char *buf) +{ + unsigned char plain[8]; + + if (kctx->enctype == ENCTYPE_ARCFOUR_HMAC) + return krb5_make_rc4_seq_num(kctx, direction, seqnum, + cksum, buf); + + plain[0] = (unsigned char) (seqnum & 0xff); + plain[1] = (unsigned char) ((seqnum >> 8) & 0xff); + plain[2] = (unsigned char) ((seqnum >> 16) & 0xff); + plain[3] = (unsigned char) ((seqnum >> 24) & 0xff); + + plain[4] = direction; + plain[5] = direction; + plain[6] = direction; + plain[7] = direction; + + return krb5_encrypt(key, cksum, plain, buf, 8); +} + +static s32 +krb5_get_rc4_seq_num(struct krb5_ctx *kctx, unsigned char *cksum, + unsigned char *buf, int *direction, s32 *seqnum) +{ + struct crypto_blkcipher *cipher; + unsigned char plain[8]; + s32 code; + + dprintk("RPC: %s:\n", __func__); + cipher = crypto_alloc_blkcipher(kctx->gk5e->encrypt_name, 0, + CRYPTO_ALG_ASYNC); + if (IS_ERR(cipher)) + return PTR_ERR(cipher); + + code = krb5_rc4_setup_seq_key(kctx, cipher, cksum); + if (code) + goto out; + + code = krb5_decrypt(cipher, cksum, buf, plain, 8); + if (code) + goto out; + + if ((plain[4] != plain[5]) || (plain[4] != plain[6]) + || (plain[4] != plain[7])) { + code = (s32)KG_BAD_SEQ; + goto out; + } + + *direction = plain[4]; + + *seqnum = ((plain[0] << 24) | (plain[1] << 16) | + (plain[2] << 8) | (plain[3])); +out: + crypto_free_blkcipher(cipher); + return code; +} + +s32 +krb5_get_seq_num(struct krb5_ctx *kctx, + unsigned char *cksum, + unsigned char *buf, + int *direction, u32 *seqnum) +{ + s32 code; + unsigned char plain[8]; + struct crypto_blkcipher *key = kctx->seq; + + dprintk("RPC: krb5_get_seq_num:\n"); + + if (kctx->enctype == ENCTYPE_ARCFOUR_HMAC) + return krb5_get_rc4_seq_num(kctx, cksum, buf, + direction, seqnum); + + if ((code = krb5_decrypt(key, cksum, buf, plain, 8))) + return code; + + if ((plain[4] != plain[5]) || (plain[4] != plain[6]) || + (plain[4] != plain[7])) + return (s32)KG_BAD_SEQ; + + *direction = plain[4]; + + *seqnum = ((plain[0]) | + (plain[1] << 8) | (plain[2] << 16) | (plain[3] << 24)); + + return 0; +} |