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1da177e4 LT |
1 | /* |
2 | * linux/net/sunrpc/gss_krb5_seal.c | |
3 | * | |
4 | * Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/k5seal.c | |
5 | * | |
6 | * Copyright (c) 2000 The Regents of the University of Michigan. | |
7 | * All rights reserved. | |
8 | * | |
9 | * Andy Adamson <andros@umich.edu> | |
10 | * J. Bruce Fields <bfields@umich.edu> | |
11 | */ | |
12 | ||
13 | /* | |
14 | * Copyright 1993 by OpenVision Technologies, Inc. | |
15 | * | |
16 | * Permission to use, copy, modify, distribute, and sell this software | |
17 | * and its documentation for any purpose is hereby granted without fee, | |
18 | * provided that the above copyright notice appears in all copies and | |
19 | * that both that copyright notice and this permission notice appear in | |
20 | * supporting documentation, and that the name of OpenVision not be used | |
21 | * in advertising or publicity pertaining to distribution of the software | |
22 | * without specific, written prior permission. OpenVision makes no | |
23 | * representations about the suitability of this software for any | |
24 | * purpose. It is provided "as is" without express or implied warranty. | |
25 | * | |
26 | * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, | |
27 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO | |
28 | * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR | |
29 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF | |
30 | * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR | |
31 | * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR | |
32 | * PERFORMANCE OF THIS SOFTWARE. | |
33 | */ | |
34 | ||
35 | /* | |
36 | * Copyright (C) 1998 by the FundsXpress, INC. | |
37 | * | |
38 | * All rights reserved. | |
39 | * | |
40 | * Export of this software from the United States of America may require | |
41 | * a specific license from the United States Government. It is the | |
42 | * responsibility of any person or organization contemplating export to | |
43 | * obtain such a license before exporting. | |
44 | * | |
45 | * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and | |
46 | * distribute this software and its documentation for any purpose and | |
47 | * without fee is hereby granted, provided that the above copyright | |
48 | * notice appear in all copies and that both that copyright notice and | |
49 | * this permission notice appear in supporting documentation, and that | |
50 | * the name of FundsXpress. not be used in advertising or publicity pertaining | |
51 | * to distribution of the software without specific, written prior | |
52 | * permission. FundsXpress makes no representations about the suitability of | |
53 | * this software for any purpose. It is provided "as is" without express | |
54 | * or implied warranty. | |
55 | * | |
56 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
57 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
58 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
59 | */ | |
60 | ||
61 | #include <linux/types.h> | |
62 | #include <linux/slab.h> | |
63 | #include <linux/jiffies.h> | |
64 | #include <linux/sunrpc/gss_krb5.h> | |
65 | #include <linux/random.h> | |
1da177e4 LT |
66 | #include <linux/crypto.h> |
67 | ||
68 | #ifdef RPC_DEBUG | |
69 | # define RPCDBG_FACILITY RPCDBG_AUTH | |
70 | #endif | |
71 | ||
34af946a | 72 | DEFINE_SPINLOCK(krb5_seq_lock); |
eaa82edf | 73 | |
1da177e4 | 74 | u32 |
a0857d03 BF |
75 | gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text, |
76 | struct xdr_netobj *token) | |
1da177e4 | 77 | { |
a0857d03 | 78 | struct krb5_ctx *ctx = gss_ctx->internal_ctx_id; |
9e57b302 BF |
79 | char cksumdata[16]; |
80 | struct xdr_netobj md5cksum = {.len = 0, .data = cksumdata}; | |
1da177e4 LT |
81 | unsigned char *ptr, *krb5_hdr, *msg_start; |
82 | s32 now; | |
eaa82edf | 83 | u32 seq_send; |
1da177e4 | 84 | |
8885cb36 | 85 | dprintk("RPC: gss_krb5_seal\n"); |
ef338bee | 86 | BUG_ON(ctx == NULL); |
1da177e4 LT |
87 | |
88 | now = get_seconds(); | |
89 | ||
4ab4b0be | 90 | token->len = g_token_size(&ctx->mech_used, 24); |
1da177e4 LT |
91 | |
92 | ptr = token->data; | |
4ab4b0be | 93 | g_make_token_header(&ctx->mech_used, 24, &ptr); |
1da177e4 | 94 | |
bfa91516 BF |
95 | *ptr++ = (unsigned char) ((KG_TOK_MIC_MSG>>8)&0xff); |
96 | *ptr++ = (unsigned char) (KG_TOK_MIC_MSG&0xff); | |
1da177e4 LT |
97 | |
98 | /* ptr now at byte 2 of header described in rfc 1964, section 1.2.1: */ | |
99 | krb5_hdr = ptr - 2; | |
100 | msg_start = krb5_hdr + 24; | |
101 | ||
e678e06b | 102 | *(__be16 *)(krb5_hdr + 2) = htons(SGN_ALG_DES_MAC_MD5); |
1da177e4 | 103 | memset(krb5_hdr + 4, 0xff, 4); |
1da177e4 | 104 | |
ca54f896 | 105 | if (make_checksum("md5", krb5_hdr, 8, text, 0, &md5cksum)) |
39a21dd1 | 106 | return GSS_S_FAILURE; |
e678e06b BF |
107 | |
108 | if (krb5_encrypt(ctx->seq, NULL, md5cksum.data, | |
109 | md5cksum.data, md5cksum.len)) | |
39a21dd1 | 110 | return GSS_S_FAILURE; |
94efa934 | 111 | |
30aef316 | 112 | memcpy(krb5_hdr + 16, md5cksum.data + md5cksum.len - 8, 8); |
1da177e4 | 113 | |
eaa82edf BF |
114 | spin_lock(&krb5_seq_lock); |
115 | seq_send = ctx->seq_send++; | |
116 | spin_unlock(&krb5_seq_lock); | |
117 | ||
94efa934 | 118 | if (krb5_make_seq_num(ctx->seq, ctx->initiate ? 0 : 0xff, |
5743d65c | 119 | seq_send, krb5_hdr + 16, krb5_hdr + 8)) |
39a21dd1 | 120 | return GSS_S_FAILURE; |
1da177e4 | 121 | |
94efa934 | 122 | return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE; |
1da177e4 | 123 | } |