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1/* $OpenBSD: t1_reneg.c,v 1.11 2015/06/20 16:42:48 doug 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#include "bytestring.h"
118
119/* Add the client's renegotiation binding */
120int
121ssl_add_clienthello_renegotiate_ext(SSL *s, unsigned char *p, int *len,
122 int maxlen)
123{
124 if (p) {
125 if ((s->s3->previous_client_finished_len + 1) > maxlen) {
126 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_RENEGOTIATE_EXT,
127 SSL_R_RENEGOTIATE_EXT_TOO_LONG);
128 return 0;
129 }
130
131 /* Length byte */
132 *p = s->s3->previous_client_finished_len;
133 p++;
134
135 memcpy(p, s->s3->previous_client_finished,
136 s->s3->previous_client_finished_len);
137
138 }
139
140 *len = s->s3->previous_client_finished_len + 1;
141
142 return 1;
143}
144
145/* Parse the client's renegotiation binding and abort if it's not
146 right */
147int
148ssl_parse_clienthello_renegotiate_ext(SSL *s, const unsigned char *d, int len,
149 int *al)
150{
151 CBS cbs, reneg;
152
153 if (len < 0) {
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
160 CBS_init(&cbs, d, len);
161 if (!CBS_get_u8_length_prefixed(&cbs, &reneg) ||
162 /* Consistency check */
163 CBS_len(&cbs) != 0) {
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 (CBS_len(&reneg) != 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 (!CBS_mem_equal(&reneg, s->s3->previous_client_finished,
179 s->s3->previous_client_finished_len)) {
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 s->s3->send_connection_binding = 1;
187
188 return 1;
189}
190
191/* Add the server's renegotiation binding */
192int
193ssl_add_serverhello_renegotiate_ext(SSL *s, unsigned char *p, int *len,
194 int maxlen)
195{
196 if (p) {
197 if ((s->s3->previous_client_finished_len +
198 s->s3->previous_server_finished_len + 1) > maxlen) {
199 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_RENEGOTIATE_EXT,
200 SSL_R_RENEGOTIATE_EXT_TOO_LONG);
201 return 0;
202 }
203
204 /* Length byte */
205 *p = s->s3->previous_client_finished_len +
206 s->s3->previous_server_finished_len;
207 p++;
208
209 memcpy(p, s->s3->previous_client_finished,
210 s->s3->previous_client_finished_len);
211 p += s->s3->previous_client_finished_len;
212
213 memcpy(p, s->s3->previous_server_finished,
214 s->s3->previous_server_finished_len);
215
216 }
217
218 *len = s->s3->previous_client_finished_len +
219 s->s3->previous_server_finished_len + 1;
220
221 return 1;
222}
223
224/* Parse the server's renegotiation binding and abort if it's not
225 right */
226int
227ssl_parse_serverhello_renegotiate_ext(SSL *s, const unsigned char *d, int len, int *al)
228{
229 CBS cbs, reneg, previous_client, previous_server;
230 int expected_len = s->s3->previous_client_finished_len +
231 s->s3->previous_server_finished_len;
232
233 /* Check for logic errors */
234 OPENSSL_assert(!expected_len || s->s3->previous_client_finished_len);
235 OPENSSL_assert(!expected_len || s->s3->previous_server_finished_len);
236
237 if (len < 0) {
238 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
239 SSL_R_RENEGOTIATION_ENCODING_ERR);
240 *al = SSL_AD_ILLEGAL_PARAMETER;
241 return 0;
242 }
243
244 CBS_init(&cbs, d, len);
245
246 if (!CBS_get_u8_length_prefixed(&cbs, &reneg) ||
247 /* Consistency check */
248 CBS_len(&cbs) != 0) {
249 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
250 SSL_R_RENEGOTIATION_ENCODING_ERR);
251 *al = SSL_AD_ILLEGAL_PARAMETER;
252 return 0;
253 }
254
255 /* Check that the extension matches */
256 if (CBS_len(&reneg) != expected_len ||
257 !CBS_get_bytes(&reneg, &previous_client,
258 s->s3->previous_client_finished_len) ||
259 !CBS_get_bytes(&reneg, &previous_server,
260 s->s3->previous_server_finished_len) ||
261 CBS_len(&reneg) != 0) {
262 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
263 SSL_R_RENEGOTIATION_MISMATCH);
264 *al = SSL_AD_HANDSHAKE_FAILURE;
265 return 0;
266 }
267
268 if (!CBS_mem_equal(&previous_client, s->s3->previous_client_finished,
269 CBS_len(&previous_client))) {
270 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
271 SSL_R_RENEGOTIATION_MISMATCH);
272 *al = SSL_AD_HANDSHAKE_FAILURE;
273 return 0;
274 }
275 if (!CBS_mem_equal(&previous_server, s->s3->previous_server_finished,
276 CBS_len(&previous_server))) {
277 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
278 SSL_R_RENEGOTIATION_MISMATCH);
279 *al = SSL_AD_ILLEGAL_PARAMETER;
280 return 0;
281 }
282
283 s->s3->send_connection_binding = 1;
284
285 return 1;
286}
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