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1/* $OpenBSD: t1_reneg.c,v 1.9 2014/11/16 14:12:47 jsing Exp $ */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58/* ====================================================================
59 * Copyright (c) 1998-2009 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111
112#include <stdio.h>
113
114#include <openssl/objects.h>
115
116#include "ssl_locl.h"
117
118/* Add the client's renegotiation binding */
119int
120ssl_add_clienthello_renegotiate_ext(SSL *s, unsigned char *p, int *len,
121 int maxlen)
122{
123 if (p) {
124 if ((s->s3->previous_client_finished_len + 1) > maxlen) {
125 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_RENEGOTIATE_EXT,
126 SSL_R_RENEGOTIATE_EXT_TOO_LONG);
127 return 0;
128 }
129
130 /* Length byte */
131 *p = s->s3->previous_client_finished_len;
132 p++;
133
134 memcpy(p, s->s3->previous_client_finished,
135 s->s3->previous_client_finished_len);
136
137 }
138
139 *len = s->s3->previous_client_finished_len + 1;
140
141 return 1;
142}
143
144/* Parse the client's renegotiation binding and abort if it's not
145 right */
146int
147ssl_parse_clienthello_renegotiate_ext(SSL *s, unsigned char *d, int len,
148 int *al)
149{
150 int ilen;
151
152 /* Parse the length byte */
153 if (len < 1) {
154 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
155 SSL_R_RENEGOTIATION_ENCODING_ERR);
156 *al = SSL_AD_ILLEGAL_PARAMETER;
157 return 0;
158 }
159 ilen = *d;
160 d++;
161
162 /* Consistency check */
163 if ((ilen + 1) != len) {
164 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
165 SSL_R_RENEGOTIATION_ENCODING_ERR);
166 *al = SSL_AD_ILLEGAL_PARAMETER;
167 return 0;
168 }
169
170 /* Check that the extension matches */
171 if (ilen != s->s3->previous_client_finished_len) {
172 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
173 SSL_R_RENEGOTIATION_MISMATCH);
174 *al = SSL_AD_HANDSHAKE_FAILURE;
175 return 0;
176 }
177
178 if (timingsafe_memcmp(d, s->s3->previous_client_finished,
179 s->s3->previous_client_finished_len) != 0) {
180 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
181 SSL_R_RENEGOTIATION_MISMATCH);
182 *al = SSL_AD_HANDSHAKE_FAILURE;
183 return 0;
184 }
185
186
187 s->s3->send_connection_binding = 1;
188
189 return 1;
190}
191
192/* Add the server's renegotiation binding */
193int
194ssl_add_serverhello_renegotiate_ext(SSL *s, unsigned char *p, int *len,
195 int maxlen)
196{
197 if (p) {
198 if ((s->s3->previous_client_finished_len +
199 s->s3->previous_server_finished_len + 1) > maxlen) {
200 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_RENEGOTIATE_EXT,
201 SSL_R_RENEGOTIATE_EXT_TOO_LONG);
202 return 0;
203 }
204
205 /* Length byte */
206 *p = s->s3->previous_client_finished_len +
207 s->s3->previous_server_finished_len;
208 p++;
209
210 memcpy(p, s->s3->previous_client_finished,
211 s->s3->previous_client_finished_len);
212 p += s->s3->previous_client_finished_len;
213
214 memcpy(p, s->s3->previous_server_finished,
215 s->s3->previous_server_finished_len);
216
217 }
218
219 *len = s->s3->previous_client_finished_len +
220 s->s3->previous_server_finished_len + 1;
221
222 return 1;
223}
224
225/* Parse the server's renegotiation binding and abort if it's not
226 right */
227int
228ssl_parse_serverhello_renegotiate_ext(SSL *s, unsigned char *d, int len,
229 int *al)
230{
231 int expected_len = s->s3->previous_client_finished_len +
232 s->s3->previous_server_finished_len;
233 int ilen;
234
235 /* Check for logic errors */
236 OPENSSL_assert(!expected_len || s->s3->previous_client_finished_len);
237 OPENSSL_assert(!expected_len || s->s3->previous_server_finished_len);
238
239 /* Parse the length byte */
240 if (len < 1) {
241 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
242 SSL_R_RENEGOTIATION_ENCODING_ERR);
243 *al = SSL_AD_ILLEGAL_PARAMETER;
244 return 0;
245 }
246 ilen = *d;
247 d++;
248
249 /* Consistency check */
250 if (ilen + 1 != len) {
251 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
252 SSL_R_RENEGOTIATION_ENCODING_ERR);
253 *al = SSL_AD_ILLEGAL_PARAMETER;
254 return 0;
255 }
256
257 /* Check that the extension matches */
258 if (ilen != expected_len) {
259 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
260 SSL_R_RENEGOTIATION_MISMATCH);
261 *al = SSL_AD_HANDSHAKE_FAILURE;
262 return 0;
263 }
264
265 if (timingsafe_memcmp(d, s->s3->previous_client_finished,
266 s->s3->previous_client_finished_len) != 0) {
267 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
268 SSL_R_RENEGOTIATION_MISMATCH);
269 *al = SSL_AD_HANDSHAKE_FAILURE;
270 return 0;
271 }
272 d += s->s3->previous_client_finished_len;
273
274 if (timingsafe_memcmp(d, s->s3->previous_server_finished,
275 s->s3->previous_server_finished_len)) {
276 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
277 SSL_R_RENEGOTIATION_MISMATCH);
278 *al = SSL_AD_ILLEGAL_PARAMETER;
279 return 0;
280 }
281
282 s->s3->send_connection_binding = 1;
283
284 return 1;
285}
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