| /* |
| * 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; |
| } |