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        {
121	if((s->s3->previous_client_finished_len+1) > maxlen)
122            {
123            SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_RENEGOTIATE_EXT,SSL_R_RENEGOTIATE_EXT_TOO_LONG);
124            return 0;
125            }
126
127        /* Length byte */
128	*p = s->s3->previous_client_finished_len;
129        p++;
130
131        memcpy(p, s->s3->previous_client_finished,
132	       s->s3->previous_client_finished_len);
133#ifdef OPENSSL_RI_DEBUG
134    fprintf(stderr, "%s RI extension sent by client\n",
135		s->s3->previous_client_finished_len ? "Non-empty" : "Empty");
136#endif
137        }
138
139    *len=s->s3->previous_client_finished_len + 1;
140
141
142    return 1;
143    }
144
145/* Parse the client's renegotiation binding and abort if it's not
146   right */
147int ssl_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        {
155        SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,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        {
165        SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,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        {
173        SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,SSL_R_RENEGOTIATION_MISMATCH);
174        *al=SSL_AD_HANDSHAKE_FAILURE;
175        return 0;
176        }
177
178    if(memcmp(d, s->s3->previous_client_finished,
179	      s->s3->previous_client_finished_len))
180        {
181        SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,SSL_R_RENEGOTIATION_MISMATCH);
182        *al=SSL_AD_HANDSHAKE_FAILURE;
183        return 0;
184        }
185#ifdef OPENSSL_RI_DEBUG
186    fprintf(stderr, "%s RI extension received by server\n",
187				ilen ? "Non-empty" : "Empty");
188#endif
189
190    s->s3->send_connection_binding=1;
191
192    return 1;
193    }
194
195/* Add the server's renegotiation binding */
196int ssl_add_serverhello_renegotiate_ext(SSL *s, unsigned char *p, int *len,
197					int maxlen)
198    {
199    if(p)
200        {
201        if((s->s3->previous_client_finished_len +
202            s->s3->previous_server_finished_len + 1) > maxlen)
203            {
204            SSLerr(SSL_F_SSL_ADD_SERVERHELLO_RENEGOTIATE_EXT,SSL_R_RENEGOTIATE_EXT_TOO_LONG);
205            return 0;
206            }
207
208        /* Length byte */
209        *p = s->s3->previous_client_finished_len + s->s3->previous_server_finished_len;
210        p++;
211
212        memcpy(p, s->s3->previous_client_finished,
213	       s->s3->previous_client_finished_len);
214        p += s->s3->previous_client_finished_len;
215
216        memcpy(p, s->s3->previous_server_finished,
217	       s->s3->previous_server_finished_len);
218#ifdef OPENSSL_RI_DEBUG
219    fprintf(stderr, "%s RI extension sent by server\n",
220    		s->s3->previous_client_finished_len ? "Non-empty" : "Empty");
221#endif
222        }
223
224    *len=s->s3->previous_client_finished_len
225	+ s->s3->previous_server_finished_len + 1;
226
227    return 1;
228    }
229
230/* Parse the server's renegotiation binding and abort if it's not
231   right */
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        {
246        SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,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        {
256        SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,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        {
264        SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,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        {
272        SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,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        {
281        SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,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