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,
134 static int find_profile_by_name(char *profile_name,
135 SRTP_PROTECTION_PROFILE **pptr, unsigned len)
137 SRTP_PROTECTION_PROFILE *p;
139 p = srtp_known_profiles;
141 if ((len == strlen(p->name))
142 && strncmp(p->name, profile_name, len) == 0) {
153 static int ssl_ctx_make_profiles(const char *profiles_string,
154 STACK_OF(SRTP_PROTECTION_PROFILE) **out)
156 STACK_OF(SRTP_PROTECTION_PROFILE) *profiles;
159 char *ptr = (char *)profiles_string;
160 SRTP_PROTECTION_PROFILE *p;
162 if ((profiles = sk_SRTP_PROTECTION_PROFILE_new_null()) == NULL) {
163 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,
164 SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES);
169 col = strchr(ptr, ':');
171 if (!find_profile_by_name(ptr, &p,
172 col ? col - ptr : (int)strlen(ptr))) {
173 if (sk_SRTP_PROTECTION_PROFILE_find(profiles, p) >= 0) {
174 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,
175 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
176 sk_SRTP_PROTECTION_PROFILE_free(profiles);
180 sk_SRTP_PROTECTION_PROFILE_push(profiles, p);
182 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,
183 SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE);
184 sk_SRTP_PROTECTION_PROFILE_free(profiles);
197 int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx, const char *profiles)
199 return ssl_ctx_make_profiles(profiles, &ctx->srtp_profiles);
202 int SSL_set_tlsext_use_srtp(SSL *s, const char *profiles)
204 return ssl_ctx_make_profiles(profiles, &s->srtp_profiles);
207 STACK_OF(SRTP_PROTECTION_PROFILE) *SSL_get_srtp_profiles(SSL *s)
210 if (s->srtp_profiles != NULL) {
211 return s->srtp_profiles;
212 } else if ((s->ctx != NULL) && (s->ctx->srtp_profiles != NULL)) {
213 return s->ctx->srtp_profiles;
220 SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *s)
222 return s->srtp_profile;
226 * Note: this function returns 0 length if there are no profiles specified
228 int ssl_add_clienthello_use_srtp_ext(SSL *s, unsigned char *p, int *len,
233 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = 0;
234 SRTP_PROTECTION_PROFILE *prof;
236 clnt = SSL_get_srtp_profiles(s);
237 ct = sk_SRTP_PROTECTION_PROFILE_num(clnt); /* -1 if clnt == 0 */
241 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT,
242 SSL_R_EMPTY_SRTP_PROTECTION_PROFILE_LIST);
246 if ((2 + ct * 2 + 1) > maxlen) {
247 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT,
248 SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG);
254 for (i = 0; i < ct; i++) {
255 prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
259 /* Add an empty use_mki value */
263 *len = 2 + ct * 2 + 1;
268 int ssl_parse_clienthello_use_srtp_ext(SSL *s, PACKET *pkt, int *al)
270 SRTP_PROTECTION_PROFILE *sprof;
271 STACK_OF(SRTP_PROTECTION_PROFILE) *srvr;
272 unsigned int ct, mki_len, id;
276 /* Pull off the length of the cipher suite list and check it is even */
277 if (!PACKET_get_net_2(pkt, &ct)
279 || !PACKET_get_sub_packet(pkt, &subpkt, ct)) {
280 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,
281 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
282 *al = SSL_AD_DECODE_ERROR;
286 srvr = SSL_get_srtp_profiles(s);
287 s->srtp_profile = NULL;
288 /* Search all profiles for a match initially */
289 srtp_pref = sk_SRTP_PROTECTION_PROFILE_num(srvr);
291 while (PACKET_remaining(&subpkt)) {
292 if (!PACKET_get_net_2(&subpkt, &id)) {
293 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,
294 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
295 *al = SSL_AD_DECODE_ERROR;
300 * Only look for match in profiles of higher preference than
302 * If no profiles have been have been configured then this
305 for (i = 0; i < srtp_pref; i++) {
306 sprof = sk_SRTP_PROTECTION_PROFILE_value(srvr, i);
307 if (sprof->id == id) {
308 s->srtp_profile = sprof;
316 * Now extract the MKI value as a sanity check, but discard it for now
318 if (!PACKET_get_1(pkt, &mki_len)) {
319 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,
320 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
321 *al = SSL_AD_DECODE_ERROR;
325 if (!PACKET_forward(pkt, mki_len)
326 || PACKET_remaining(pkt)) {
327 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,
328 SSL_R_BAD_SRTP_MKI_VALUE);
329 *al = SSL_AD_DECODE_ERROR;
336 int ssl_add_serverhello_use_srtp_ext(SSL *s, unsigned char *p, int *len,
341 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT,
342 SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG);
346 if (s->srtp_profile == 0) {
347 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT,
348 SSL_R_USE_SRTP_NOT_NEGOTIATED);
352 s2n(s->srtp_profile->id, p);
360 int ssl_parse_serverhello_use_srtp_ext(SSL *s, PACKET *pkt, int *al)
362 unsigned int id, ct, mki;
365 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt;
366 SRTP_PROTECTION_PROFILE *prof;
368 if (!PACKET_get_net_2(pkt, &ct)
370 || !PACKET_get_net_2(pkt, &id)
371 || !PACKET_get_1(pkt, &mki)
372 || PACKET_remaining(pkt) != 0) {
373 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,
374 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
375 *al = SSL_AD_DECODE_ERROR;
380 /* Must be no MKI, since we never offer one */
381 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,
382 SSL_R_BAD_SRTP_MKI_VALUE);
383 *al = SSL_AD_ILLEGAL_PARAMETER;
387 clnt = SSL_get_srtp_profiles(s);
389 /* Throw an error if the server gave us an unsolicited extension */
391 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,
392 SSL_R_NO_SRTP_PROFILES);
393 *al = SSL_AD_DECODE_ERROR;
398 * Check to see if the server gave us something we support (and
399 * presumably offered)
401 for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(clnt); i++) {
402 prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
404 if (prof->id == id) {
405 s->srtp_profile = prof;
411 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,
412 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
413 *al = SSL_AD_DECODE_ERROR;