1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
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)"
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
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.]
57 /* ====================================================================
58 * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved.
60 * Redistribution and use in source and binary forms, with or without
61 * modification, are permitted provided that the following conditions
64 * 1. Redistributions of source code must retain the above copyright
65 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
86 * 6. Redistributions of any form whatsoever must retain the following
88 * "This product includes software developed by the OpenSSL Project
89 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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 * ====================================================================
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).
111 * DTLS code by Eric Rescorla <ekr@rtfm.com>
113 * Copyright (C) 2006, Network Resonance, Inc. Copyright (C) 2011, RTFM, Inc.
117 #include <openssl/objects.h>
118 #include "ssl_locl.h"
120 #ifndef OPENSSL_NO_SRTP
122 static SRTP_PROTECTION_PROFILE srtp_known_profiles[] = {
124 "SRTP_AES128_CM_SHA1_80",
125 SRTP_AES128_CM_SHA1_80,
128 "SRTP_AES128_CM_SHA1_32",
129 SRTP_AES128_CM_SHA1_32,
132 "SRTP_AEAD_AES_128_GCM",
133 SRTP_AEAD_AES_128_GCM
136 "SRTP_AEAD_AES_256_GCM",
137 SRTP_AEAD_AES_256_GCM
142 static int find_profile_by_name(char *profile_name,
143 SRTP_PROTECTION_PROFILE **pptr, unsigned len)
145 SRTP_PROTECTION_PROFILE *p;
147 p = srtp_known_profiles;
149 if ((len == strlen(p->name))
150 && strncmp(p->name, profile_name, len) == 0) {
161 static int ssl_ctx_make_profiles(const char *profiles_string,
162 STACK_OF(SRTP_PROTECTION_PROFILE) **out)
164 STACK_OF(SRTP_PROTECTION_PROFILE) *profiles;
167 char *ptr = (char *)profiles_string;
168 SRTP_PROTECTION_PROFILE *p;
170 if ((profiles = sk_SRTP_PROTECTION_PROFILE_new_null()) == NULL) {
171 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,
172 SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES);
177 col = strchr(ptr, ':');
179 if (!find_profile_by_name(ptr, &p,
180 col ? col - ptr : (int)strlen(ptr))) {
181 if (sk_SRTP_PROTECTION_PROFILE_find(profiles, p) >= 0) {
182 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,
183 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
184 sk_SRTP_PROTECTION_PROFILE_free(profiles);
188 sk_SRTP_PROTECTION_PROFILE_push(profiles, p);
190 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,
191 SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE);
192 sk_SRTP_PROTECTION_PROFILE_free(profiles);
200 sk_SRTP_PROTECTION_PROFILE_free(*out);
207 int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx, const char *profiles)
209 return ssl_ctx_make_profiles(profiles, &ctx->srtp_profiles);
212 int SSL_set_tlsext_use_srtp(SSL *s, const char *profiles)
214 return ssl_ctx_make_profiles(profiles, &s->srtp_profiles);
217 STACK_OF(SRTP_PROTECTION_PROFILE) *SSL_get_srtp_profiles(SSL *s)
220 if (s->srtp_profiles != NULL) {
221 return s->srtp_profiles;
222 } else if ((s->ctx != NULL) && (s->ctx->srtp_profiles != NULL)) {
223 return s->ctx->srtp_profiles;
230 SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *s)
232 return s->srtp_profile;
236 * Note: this function returns 0 length if there are no profiles specified
238 int ssl_add_clienthello_use_srtp_ext(SSL *s, unsigned char *p, int *len,
243 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = 0;
244 SRTP_PROTECTION_PROFILE *prof;
246 clnt = SSL_get_srtp_profiles(s);
247 ct = sk_SRTP_PROTECTION_PROFILE_num(clnt); /* -1 if clnt == 0 */
251 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT,
252 SSL_R_EMPTY_SRTP_PROTECTION_PROFILE_LIST);
256 if ((2 + ct * 2 + 1) > maxlen) {
257 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT,
258 SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG);
264 for (i = 0; i < ct; i++) {
265 prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
269 /* Add an empty use_mki value */
273 *len = 2 + ct * 2 + 1;
278 int ssl_parse_clienthello_use_srtp_ext(SSL *s, PACKET *pkt, int *al)
280 SRTP_PROTECTION_PROFILE *sprof;
281 STACK_OF(SRTP_PROTECTION_PROFILE) *srvr;
282 unsigned int ct, mki_len, id;
286 /* Pull off the length of the cipher suite list and check it is even */
287 if (!PACKET_get_net_2(pkt, &ct)
289 || !PACKET_get_sub_packet(pkt, &subpkt, ct)) {
290 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,
291 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
292 *al = SSL_AD_DECODE_ERROR;
296 srvr = SSL_get_srtp_profiles(s);
297 s->srtp_profile = NULL;
298 /* Search all profiles for a match initially */
299 srtp_pref = sk_SRTP_PROTECTION_PROFILE_num(srvr);
301 while (PACKET_remaining(&subpkt)) {
302 if (!PACKET_get_net_2(&subpkt, &id)) {
303 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,
304 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
305 *al = SSL_AD_DECODE_ERROR;
310 * Only look for match in profiles of higher preference than
312 * If no profiles have been have been configured then this
315 for (i = 0; i < srtp_pref; i++) {
316 sprof = sk_SRTP_PROTECTION_PROFILE_value(srvr, i);
317 if (sprof->id == id) {
318 s->srtp_profile = sprof;
326 * Now extract the MKI value as a sanity check, but discard it for now
328 if (!PACKET_get_1(pkt, &mki_len)) {
329 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,
330 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
331 *al = SSL_AD_DECODE_ERROR;
335 if (!PACKET_forward(pkt, mki_len)
336 || PACKET_remaining(pkt)) {
337 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,
338 SSL_R_BAD_SRTP_MKI_VALUE);
339 *al = SSL_AD_DECODE_ERROR;
346 int ssl_add_serverhello_use_srtp_ext(SSL *s, unsigned char *p, int *len,
351 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT,
352 SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG);
356 if (s->srtp_profile == 0) {
357 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT,
358 SSL_R_USE_SRTP_NOT_NEGOTIATED);
362 s2n(s->srtp_profile->id, p);
370 int ssl_parse_serverhello_use_srtp_ext(SSL *s, PACKET *pkt, int *al)
372 unsigned int id, ct, mki;
375 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt;
376 SRTP_PROTECTION_PROFILE *prof;
378 if (!PACKET_get_net_2(pkt, &ct)
380 || !PACKET_get_net_2(pkt, &id)
381 || !PACKET_get_1(pkt, &mki)
382 || PACKET_remaining(pkt) != 0) {
383 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,
384 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
385 *al = SSL_AD_DECODE_ERROR;
390 /* Must be no MKI, since we never offer one */
391 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,
392 SSL_R_BAD_SRTP_MKI_VALUE);
393 *al = SSL_AD_ILLEGAL_PARAMETER;
397 clnt = SSL_get_srtp_profiles(s);
399 /* Throw an error if the server gave us an unsolicited extension */
401 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,
402 SSL_R_NO_SRTP_PROFILES);
403 *al = SSL_AD_DECODE_ERROR;
408 * Check to see if the server gave us something we support (and
409 * presumably offered)
411 for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(clnt); i++) {
412 prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
414 if (prof->id == id) {
415 s->srtp_profile = prof;
421 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,
422 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
423 *al = SSL_AD_DECODE_ERROR;