2 * Copyright (c) 1997 - 2003 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "krb5/gsskrb5_locl.h"
36 RCSID("$Id: 8003.c 18334 2006-10-07 22:16:04Z lha $");
39 _gsskrb5_encode_om_uint32(OM_uint32 n, u_char *p)
41 p[0] = (n >> 0) & 0xFF;
42 p[1] = (n >> 8) & 0xFF;
43 p[2] = (n >> 16) & 0xFF;
44 p[3] = (n >> 24) & 0xFF;
49 _gsskrb5_encode_be_om_uint32(OM_uint32 n, u_char *p)
51 p[0] = (n >> 24) & 0xFF;
52 p[1] = (n >> 16) & 0xFF;
53 p[2] = (n >> 8) & 0xFF;
54 p[3] = (n >> 0) & 0xFF;
59 _gsskrb5_decode_om_uint32(const void *ptr, OM_uint32 *n)
61 const u_char *p = ptr;
62 *n = (p[0] << 0) | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
67 _gsskrb5_decode_be_om_uint32(const void *ptr, OM_uint32 *n)
69 const u_char *p = ptr;
70 *n = (p[0] <<24) | (p[1] << 16) | (p[2] << 8) | (p[3] << 0);
74 static krb5_error_code
75 hash_input_chan_bindings (const gss_channel_bindings_t b,
82 _gsskrb5_encode_om_uint32 (b->initiator_addrtype, num);
83 MD5_Update (&md5, num, sizeof(num));
84 _gsskrb5_encode_om_uint32 (b->initiator_address.length, num);
85 MD5_Update (&md5, num, sizeof(num));
86 if (b->initiator_address.length)
88 b->initiator_address.value,
89 b->initiator_address.length);
90 _gsskrb5_encode_om_uint32 (b->acceptor_addrtype, num);
91 MD5_Update (&md5, num, sizeof(num));
92 _gsskrb5_encode_om_uint32 (b->acceptor_address.length, num);
93 MD5_Update (&md5, num, sizeof(num));
94 if (b->acceptor_address.length)
96 b->acceptor_address.value,
97 b->acceptor_address.length);
98 _gsskrb5_encode_om_uint32 (b->application_data.length, num);
99 MD5_Update (&md5, num, sizeof(num));
100 if (b->application_data.length)
102 b->application_data.value,
103 b->application_data.length);
109 * create a checksum over the chanel bindings in
110 * `input_chan_bindings', `flags' and `fwd_data' and return it in
115 _gsskrb5_create_8003_checksum (
116 OM_uint32 *minor_status,
117 const gss_channel_bindings_t input_chan_bindings,
119 const krb5_data *fwd_data,
125 * see rfc1964 (section 1.1.1 (Initial Token), and the checksum value
127 result->cksumtype = CKSUMTYPE_GSSAPI;
128 if (fwd_data->length > 0 && (flags & GSS_C_DELEG_FLAG))
129 result->checksum.length = 24 + 4 + fwd_data->length;
131 result->checksum.length = 24;
132 result->checksum.data = malloc (result->checksum.length);
133 if (result->checksum.data == NULL) {
134 *minor_status = ENOMEM;
135 return GSS_S_FAILURE;
138 p = result->checksum.data;
139 _gsskrb5_encode_om_uint32 (16, p);
141 if (input_chan_bindings == GSS_C_NO_CHANNEL_BINDINGS) {
144 hash_input_chan_bindings (input_chan_bindings, p);
147 _gsskrb5_encode_om_uint32 (flags, p);
150 if (fwd_data->length > 0 && (flags & GSS_C_DELEG_FLAG)) {
152 *p++ = (1 >> 0) & 0xFF; /* DlgOpt */ /* == 1 */
153 *p++ = (1 >> 8) & 0xFF; /* DlgOpt */ /* == 0 */
154 *p++ = (fwd_data->length >> 0) & 0xFF; /* Dlgth */
155 *p++ = (fwd_data->length >> 8) & 0xFF; /* Dlgth */
156 memcpy(p, (unsigned char *) fwd_data->data, fwd_data->length);
158 p += fwd_data->length;
161 return GSS_S_COMPLETE;
165 * verify the checksum in `cksum' over `input_chan_bindings'
166 * returning `flags' and `fwd_data'
170 _gsskrb5_verify_8003_checksum(
171 OM_uint32 *minor_status,
172 const gss_channel_bindings_t input_chan_bindings,
173 const Checksum *cksum,
177 unsigned char hash[16];
181 static unsigned char zeros[16];
185 return GSS_S_BAD_BINDINGS;
188 /* XXX should handle checksums > 24 bytes */
189 if(cksum->cksumtype != CKSUMTYPE_GSSAPI || cksum->checksum.length < 24) {
191 return GSS_S_BAD_BINDINGS;
194 p = cksum->checksum.data;
195 _gsskrb5_decode_om_uint32(p, &length);
196 if(length != sizeof(hash)) {
198 return GSS_S_BAD_BINDINGS;
203 if (input_chan_bindings != GSS_C_NO_CHANNEL_BINDINGS
204 && memcmp(p, zeros, sizeof(zeros)) != 0) {
205 if(hash_input_chan_bindings(input_chan_bindings, hash) != 0) {
207 return GSS_S_BAD_BINDINGS;
209 if(memcmp(hash, p, sizeof(hash)) != 0) {
211 return GSS_S_BAD_BINDINGS;
217 _gsskrb5_decode_om_uint32(p, flags);
220 if (cksum->checksum.length > 24 && (*flags & GSS_C_DELEG_FLAG)) {
221 if(cksum->checksum.length < 28) {
223 return GSS_S_BAD_BINDINGS;
226 DlgOpt = (p[0] << 0) | (p[1] << 8);
230 return GSS_S_BAD_BINDINGS;
233 fwd_data->length = (p[0] << 0) | (p[1] << 8);
235 if(cksum->checksum.length < 28 + fwd_data->length) {
237 return GSS_S_BAD_BINDINGS;
239 fwd_data->data = malloc(fwd_data->length);
240 if (fwd_data->data == NULL) {
241 *minor_status = ENOMEM;
242 return GSS_S_FAILURE;
244 memcpy(fwd_data->data, p, fwd_data->length);
247 return GSS_S_COMPLETE;