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>
66 #include <asm/scatterlist.h>
67 #include <linux/crypto.h>
68
69 #ifdef RPC_DEBUG
70 # define RPCDBG_FACILITY RPCDBG_AUTH
71 #endif
72
73 static inline int
74 gss_krb5_padding(int blocksize, int length) {
75 /* Most of the code is block-size independent but in practice we
76 * use only 8: */
77 BUG_ON(blocksize != 8);
78 return 8 - (length & 7);
79 }
80
81 u32
82 krb5_make_token(struct krb5_ctx *ctx, int qop_req,
83 struct xdr_buf *text, struct xdr_netobj *token,
84 int toktype)
85 {
86 s32 checksum_type;
87 struct xdr_netobj md5cksum = {.len = 0, .data = NULL};
88 int blocksize = 0, tmsglen;
89 unsigned char *ptr, *krb5_hdr, *msg_start;
90 s32 now;
91
92 dprintk("RPC: gss_krb5_seal\n");
93
94 now = get_seconds();
95
96 if (qop_req != 0)
97 goto out_err;
98
99 switch (ctx->signalg) {
100 case SGN_ALG_DES_MAC_MD5:
101 checksum_type = CKSUMTYPE_RSA_MD5;
102 break;
103 default:
104 dprintk("RPC: gss_krb5_seal: ctx->signalg %d not"
105 " supported\n", ctx->signalg);
106 goto out_err;
107 }
108 if (ctx->sealalg != SEAL_ALG_NONE && ctx->sealalg != SEAL_ALG_DES) {
109 dprintk("RPC: gss_krb5_seal: ctx->sealalg %d not supported\n",
110 ctx->sealalg);
111 goto out_err;
112 }
113
114 if (toktype == KG_TOK_WRAP_MSG) {
115 blocksize = crypto_tfm_alg_blocksize(ctx->enc);
116 tmsglen = blocksize + text->len
117 + gss_krb5_padding(blocksize, blocksize + text->len);
118 } else {
119 tmsglen = 0;
120 }
121
122 token->len = g_token_size(&ctx->mech_used, 22 + tmsglen);
123
124 ptr = token->data;
125 g_make_token_header(&ctx->mech_used, 22 + tmsglen, &ptr);
126
127 *ptr++ = (unsigned char) ((toktype>>8)&0xff);
128 *ptr++ = (unsigned char) (toktype&0xff);
129
130 /* ptr now at byte 2 of header described in rfc 1964, section 1.2.1: */
131 krb5_hdr = ptr - 2;
132 msg_start = krb5_hdr + 24;
133
134 *(u16 *)(krb5_hdr + 2) = htons(ctx->signalg);
135 memset(krb5_hdr + 4, 0xff, 4);
136 if (toktype == KG_TOK_WRAP_MSG)
137 *(u16 *)(krb5_hdr + 4) = htons(ctx->sealalg);
138
139 if (toktype == KG_TOK_WRAP_MSG) {
140 /* XXX removing support for now */
141 goto out_err;
142 } else { /* Sign only. */
143 if (make_checksum(checksum_type, krb5_hdr, 8, text,
144 &md5cksum))
145 goto out_err;
146 }
147
148 switch (ctx->signalg) {
149 case SGN_ALG_DES_MAC_MD5:
150 if (krb5_encrypt(ctx->seq, NULL, md5cksum.data,
151 md5cksum.data, md5cksum.len))
152 goto out_err;
153 memcpy(krb5_hdr + 16,
154 md5cksum.data + md5cksum.len - KRB5_CKSUM_LENGTH,
155 KRB5_CKSUM_LENGTH);
156
157 dprintk("RPC: make_seal_token: cksum data: \n");
158 print_hexl((u32 *) (krb5_hdr + 16), KRB5_CKSUM_LENGTH, 0);
159 break;
160 default:
161 BUG();
162 }
163
164 kfree(md5cksum.data);
165
166 if ((krb5_make_seq_num(ctx->seq, ctx->initiate ? 0 : 0xff,
167 ctx->seq_send, krb5_hdr + 16, krb5_hdr + 8)))
168 goto out_err;
169
170 ctx->seq_send++;
171
172 return ((ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE);
173 out_err:
174 if (md5cksum.data) kfree(md5cksum.data);
175 return GSS_S_FAILURE;
176 }
177
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