1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2  * All rights reserved.
3  *
4  * This package is an SSL implementation written
5  * by Eric Young (eay@cryptsoft.com).
6  * The implementation was written so as to conform with Netscapes SSL.
7  *
8  * This library is free for commercial and non-commercial use as long as
9  * the following conditions are aheared to.  The following conditions
10  * apply to all code found in this distribution, be it the RC4, RSA,
11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
12  * included with this distribution is covered by the same copyright terms
13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14  *
15  * Copyright remains Eric Young's, and as such any Copyright notices in
16  * the code are not to be removed.
17  * If this package is used in a product, Eric Young should be given attribution
18  * as the author of the parts of the library used.
19  * This can be in the form of a textual message at program startup or
20  * in documentation (online or textual) provided with the package.
21  *
22  * Redistribution and use in source and binary forms, with or without
23  * modification, are permitted provided that the following conditions
24  * are met:
25  * 1. Redistributions of source code must retain the copyright
26  *    notice, this list of conditions and the following disclaimer.
27  * 2. Redistributions in binary form must reproduce the above copyright
28  *    notice, this list of conditions and the following disclaimer in the
29  *    documentation and/or other materials provided with the distribution.
30  * 3. All advertising materials mentioning features or use of this software
31  *    must display the following acknowledgement:
32  *    "This product includes cryptographic software written by
33  *     Eric Young (eay@cryptsoft.com)"
34  *    The word 'cryptographic' can be left out if the rouines from the library
35  *    being used are not cryptographic related :-).
36  * 4. If you include any Windows specific code (or a derivative thereof) from
37  *    the apps directory (application code) you must include an acknowledgement:
38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39  *
40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50  * SUCH DAMAGE.
51  *
52  * The licence and distribution terms for any publically available version or
53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
54  * copied and put under another distribution licence
55  * [including the GNU Public Licence.]
56  */
57 /* ====================================================================
58  * Copyright (c) 1998-2009 The OpenSSL Project.  All rights reserved.
59  *
60  * Redistribution and use in source and binary forms, with or without
61  * modification, are permitted provided that the following conditions
62  * are met:
63  *
64  * 1. Redistributions of source code must retain the above copyright
65  *    notice, this list of conditions and the following disclaimer.
66  *
67  * 2. Redistributions in binary form must reproduce the above copyright
68  *    notice, this list of conditions and the following disclaimer in
69  *    the documentation and/or other materials provided with the
70  *    distribution.
71  *
72  * 3. All advertising materials mentioning features or use of this
73  *    software must display the following acknowledgment:
74  *    "This product includes software developed by the OpenSSL Project
75  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
76  *
77  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
78  *    endorse or promote products derived from this software without
79  *    prior written permission. For written permission, please contact
80  *    openssl-core@openssl.org.
81  *
82  * 5. Products derived from this software may not be called "OpenSSL"
83  *    nor may "OpenSSL" appear in their names without prior written
84  *    permission of the OpenSSL Project.
85  *
86  * 6. Redistributions of any form whatsoever must retain the following
87  *    acknowledgment:
88  *    "This product includes software developed by the OpenSSL Project
89  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
90  *
91  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
92  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
93  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
94  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
95  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
96  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
97  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
98  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
99  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
100  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
101  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
102  * OF THE POSSIBILITY OF SUCH DAMAGE.
103  * ====================================================================
104  *
105  * This product includes cryptographic software written by Eric Young
106  * (eay@cryptsoft.com).  This product includes software written by Tim
107  * Hudson (tjh@cryptsoft.com). */
108 
109 #include <assert.h>
110 #include <stdio.h>
111 #include <string.h>
112 
113 #include <openssl/bytestring.h>
114 #include <openssl/err.h>
115 
116 #include "internal.h"
117 
118 
119 /* Add the client's renegotiation binding */
ssl_add_clienthello_renegotiate_ext(SSL * s,unsigned char * p,int * len,int maxlen)120 int ssl_add_clienthello_renegotiate_ext(SSL *s, unsigned char *p, int *len,
121                                         int maxlen) {
122   if (p) {
123     if (s->s3->previous_client_finished_len + 1 > maxlen) {
124       OPENSSL_PUT_ERROR(SSL, ssl_add_clienthello_renegotiate_ext,
125                         SSL_R_RENEGOTIATE_EXT_TOO_LONG);
126       return 0;
127     }
128 
129     /* Length byte */
130     *p = s->s3->previous_client_finished_len;
131     p++;
132 
133     memcpy(p, s->s3->previous_client_finished,
134            s->s3->previous_client_finished_len);
135   }
136 
137   *len = s->s3->previous_client_finished_len + 1;
138 
139   return 1;
140 }
141 
142 /* Parse the client's renegotiation binding and abort if it's not right */
ssl_parse_clienthello_renegotiate_ext(SSL * s,CBS * cbs,int * out_alert)143 int ssl_parse_clienthello_renegotiate_ext(SSL *s, CBS *cbs, int *out_alert) {
144   CBS renegotiated_connection;
145 
146   if (!CBS_get_u8_length_prefixed(cbs, &renegotiated_connection) ||
147       CBS_len(cbs) != 0) {
148     OPENSSL_PUT_ERROR(SSL, ssl_parse_clienthello_renegotiate_ext,
149                       SSL_R_RENEGOTIATION_ENCODING_ERR);
150     *out_alert = SSL_AD_DECODE_ERROR;
151     return 0;
152   }
153 
154   /* Check that the extension matches */
155   if (!CBS_mem_equal(&renegotiated_connection, s->s3->previous_client_finished,
156                      s->s3->previous_client_finished_len)) {
157     OPENSSL_PUT_ERROR(SSL, ssl_parse_clienthello_renegotiate_ext,
158                       SSL_R_RENEGOTIATION_MISMATCH);
159     *out_alert = SSL_AD_HANDSHAKE_FAILURE;
160     return 0;
161   }
162 
163   s->s3->send_connection_binding = 1;
164 
165   return 1;
166 }
167 
168 /* Add the server's renegotiation binding */
ssl_add_serverhello_renegotiate_ext(SSL * s,unsigned char * p,int * len,int maxlen)169 int ssl_add_serverhello_renegotiate_ext(SSL *s, unsigned char *p, int *len,
170                                         int maxlen) {
171   if (p) {
172     if (s->s3->previous_client_finished_len +
173             s->s3->previous_server_finished_len + 1 > maxlen) {
174       OPENSSL_PUT_ERROR(SSL, ssl_add_serverhello_renegotiate_ext,
175                         SSL_R_RENEGOTIATE_EXT_TOO_LONG);
176       return 0;
177     }
178 
179     /* Length byte */
180     *p = s->s3->previous_client_finished_len +
181          s->s3->previous_server_finished_len;
182     p++;
183 
184     memcpy(p, s->s3->previous_client_finished,
185            s->s3->previous_client_finished_len);
186     p += s->s3->previous_client_finished_len;
187 
188     memcpy(p, s->s3->previous_server_finished,
189            s->s3->previous_server_finished_len);
190   }
191 
192   *len = s->s3->previous_client_finished_len +
193          s->s3->previous_server_finished_len + 1;
194 
195   return 1;
196 }
197 
198 /* Parse the server's renegotiation binding and abort if it's not right */
ssl_parse_serverhello_renegotiate_ext(SSL * s,CBS * cbs,int * out_alert)199 int ssl_parse_serverhello_renegotiate_ext(SSL *s, CBS *cbs, int *out_alert) {
200   int expected_len =
201       s->s3->previous_client_finished_len + s->s3->previous_server_finished_len;
202   CBS renegotiated_connection;
203   const uint8_t *d;
204 
205   /* Check for logic errors */
206   assert(!expected_len || s->s3->previous_client_finished_len);
207   assert(!expected_len || s->s3->previous_server_finished_len);
208 
209   /* Parse out the extension contents. */
210   if (!CBS_get_u8_length_prefixed(cbs, &renegotiated_connection) ||
211       CBS_len(cbs) != 0) {
212     OPENSSL_PUT_ERROR(SSL, ssl_parse_serverhello_renegotiate_ext,
213                       SSL_R_RENEGOTIATION_ENCODING_ERR);
214     *out_alert = SSL_AD_ILLEGAL_PARAMETER;
215     return 0;
216   }
217 
218   /* Check that the extension matches. */
219   if (CBS_len(&renegotiated_connection) != expected_len) {
220     OPENSSL_PUT_ERROR(SSL, ssl_parse_serverhello_renegotiate_ext,
221                       SSL_R_RENEGOTIATION_MISMATCH);
222     *out_alert = SSL_AD_HANDSHAKE_FAILURE;
223     return 0;
224   }
225 
226   d = CBS_data(&renegotiated_connection);
227   if (memcmp(d, s->s3->previous_client_finished,
228              s->s3->previous_client_finished_len)) {
229     OPENSSL_PUT_ERROR(SSL, ssl_parse_serverhello_renegotiate_ext,
230                       SSL_R_RENEGOTIATION_MISMATCH);
231     *out_alert = SSL_AD_HANDSHAKE_FAILURE;
232     return 0;
233   }
234   d += s->s3->previous_client_finished_len;
235 
236   if (memcmp(d, s->s3->previous_server_finished,
237              s->s3->previous_server_finished_len)) {
238     OPENSSL_PUT_ERROR(SSL, ssl_parse_serverhello_renegotiate_ext,
239                       SSL_R_RENEGOTIATION_MISMATCH);
240     *out_alert = SSL_AD_ILLEGAL_PARAMETER;
241     return 0;
242   }
243   s->s3->send_connection_binding = 1;
244 
245   return 1;
246 }
247