t1_reneg.c revision 296465 
1/* ssl/t1_reneg.c */
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#include <stdio.h>
112#include <openssl/objects.h>
113#include "ssl_locl.h"
114
115/* Add the client's renegotiation binding */
116int ssl_add_clienthello_renegotiate_ext(SSL *s, unsigned char *p, int *len,
117                                        int maxlen)
118{
119    if (p) {
120        if ((s->s3->previous_client_finished_len + 1) > maxlen) {
121            SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_RENEGOTIATE_EXT,
122                   SSL_R_RENEGOTIATE_EXT_TOO_LONG);
123            return 0;
124        }
125
126        /* Length byte */
127        *p = s->s3->previous_client_finished_len;
128        p++;
129
130        memcpy(p, s->s3->previous_client_finished,
131               s->s3->previous_client_finished_len);
132#ifdef OPENSSL_RI_DEBUG
133        fprintf(stderr, "%s RI extension sent by client\n",
134                s->s3->previous_client_finished_len ? "Non-empty" : "Empty");
135#endif
136    }
137
138    *len = s->s3->previous_client_finished_len + 1;
139
140    return 1;
141}
142
143/*
144 * Parse the client's renegotiation binding and abort if it's not right
145 */
146int ssl_parse_clienthello_renegotiate_ext(SSL *s, unsigned char *d, int len,
147                                          int *al)
148{
149    int ilen;
150
151    /* Parse the length byte */
152    if (len < 1) {
153        SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
154               SSL_R_RENEGOTIATION_ENCODING_ERR);
155        *al = SSL_AD_ILLEGAL_PARAMETER;
156        return 0;
157    }
158    ilen = *d;
159    d++;
160
161    /* Consistency check */
162    if ((ilen + 1) != len) {
163        SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
164               SSL_R_RENEGOTIATION_ENCODING_ERR);
165        *al = SSL_AD_ILLEGAL_PARAMETER;
166        return 0;
167    }
168
169    /* Check that the extension matches */
170    if (ilen != s->s3->previous_client_finished_len) {
171        SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
172               SSL_R_RENEGOTIATION_MISMATCH);
173        *al = SSL_AD_HANDSHAKE_FAILURE;
174        return 0;
175    }
176
177    if (memcmp(d, s->s3->previous_client_finished,
178               s->s3->previous_client_finished_len)) {
179        SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
180               SSL_R_RENEGOTIATION_MISMATCH);
181        *al = SSL_AD_HANDSHAKE_FAILURE;
182        return 0;
183    }
184#ifdef OPENSSL_RI_DEBUG
185    fprintf(stderr, "%s RI extension received by server\n",
186            ilen ? "Non-empty" : "Empty");
187#endif
188
189    s->s3->send_connection_binding = 1;
190
191    return 1;
192}
193
194/* Add the server's renegotiation binding */
195int ssl_add_serverhello_renegotiate_ext(SSL *s, unsigned char *p, int *len,
196                                        int maxlen)
197{
198    if (p) {
199        if ((s->s3->previous_client_finished_len +
200             s->s3->previous_server_finished_len + 1) > maxlen) {
201            SSLerr(SSL_F_SSL_ADD_SERVERHELLO_RENEGOTIATE_EXT,
202                   SSL_R_RENEGOTIATE_EXT_TOO_LONG);
203            return 0;
204        }
205
206        /* Length byte */
207        *p = s->s3->previous_client_finished_len +
208            s->s3->previous_server_finished_len;
209        p++;
210
211        memcpy(p, s->s3->previous_client_finished,
212               s->s3->previous_client_finished_len);
213        p += s->s3->previous_client_finished_len;
214
215        memcpy(p, s->s3->previous_server_finished,
216               s->s3->previous_server_finished_len);
217#ifdef OPENSSL_RI_DEBUG
218        fprintf(stderr, "%s RI extension sent by server\n",
219                s->s3->previous_client_finished_len ? "Non-empty" : "Empty");
220#endif
221    }
222
223    *len = s->s3->previous_client_finished_len
224        + s->s3->previous_server_finished_len + 1;
225
226    return 1;
227}
228
229/*
230 * Parse the server's renegotiation binding and abort if it's not right
231 */
232int ssl_parse_serverhello_renegotiate_ext(SSL *s, unsigned char *d, int len,
233                                          int *al)
234{
235    int expected_len = s->s3->previous_client_finished_len
236        + s->s3->previous_server_finished_len;
237    int ilen;
238
239    /* Check for logic errors */
240    OPENSSL_assert(!expected_len || s->s3->previous_client_finished_len);
241    OPENSSL_assert(!expected_len || s->s3->previous_server_finished_len);
242
243    /* Parse the length byte */
244    if (len < 1) {
245        SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
246               SSL_R_RENEGOTIATION_ENCODING_ERR);
247        *al = SSL_AD_ILLEGAL_PARAMETER;
248        return 0;
249    }
250    ilen = *d;
251    d++;
252
253    /* Consistency check */
254    if (ilen + 1 != len) {
255        SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
256               SSL_R_RENEGOTIATION_ENCODING_ERR);
257        *al = SSL_AD_ILLEGAL_PARAMETER;
258        return 0;
259    }
260
261    /* Check that the extension matches */
262    if (ilen != expected_len) {
263        SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
264               SSL_R_RENEGOTIATION_MISMATCH);
265        *al = SSL_AD_HANDSHAKE_FAILURE;
266        return 0;
267    }
268
269    if (memcmp(d, s->s3->previous_client_finished,
270               s->s3->previous_client_finished_len)) {
271        SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
272               SSL_R_RENEGOTIATION_MISMATCH);
273        *al = SSL_AD_HANDSHAKE_FAILURE;
274        return 0;
275    }
276    d += s->s3->previous_client_finished_len;
277
278    if (memcmp(d, s->s3->previous_server_finished,
279               s->s3->previous_server_finished_len)) {
280        SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
281               SSL_R_RENEGOTIATION_MISMATCH);
282        *al = SSL_AD_ILLEGAL_PARAMETER;
283        return 0;
284    }
285#ifdef OPENSSL_RI_DEBUG
286    fprintf(stderr, "%s RI extension received by client\n",
287            ilen ? "Non-empty" : "Empty");
288#endif
289    s->s3->send_connection_binding = 1;
290
291    return 1;
292}
293