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) 1998-2006 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 */
110 /*
111 DTLS code by Eric Rescorla <ekr@rtfm.com>
112
113 Copyright (C) 2006, Network Resonance, Inc.
114 Copyright (C) 2011, RTFM, Inc.
115 */
116
117 #include <openssl/ssl.h>
118
119 #include <string.h>
120
121 #include <openssl/bytestring.h>
122 #include <openssl/err.h>
123
124 #include "internal.h"
125
126
127 static const SRTP_PROTECTION_PROFILE kSRTPProfiles[] = {
128 {
129 "SRTP_AES128_CM_SHA1_80", SRTP_AES128_CM_SHA1_80,
130 },
131 {
132 "SRTP_AES128_CM_SHA1_32", SRTP_AES128_CM_SHA1_32,
133 },
134 {
135 "SRTP_AEAD_AES_128_GCM", SRTP_AEAD_AES_128_GCM,
136 },
137 {
138 "SRTP_AEAD_AES_256_GCM", SRTP_AEAD_AES_256_GCM,
139 },
140 {0, 0},
141 };
142
find_profile_by_name(const char * profile_name,const SRTP_PROTECTION_PROFILE ** pptr,size_t len)143 static int find_profile_by_name(const char *profile_name,
144 const SRTP_PROTECTION_PROFILE **pptr,
145 size_t len) {
146 const SRTP_PROTECTION_PROFILE *p;
147
148 p = kSRTPProfiles;
149 while (p->name) {
150 if (len == strlen(p->name) && !strncmp(p->name, profile_name, len)) {
151 *pptr = p;
152 return 1;
153 }
154
155 p++;
156 }
157
158 return 0;
159 }
160
ssl_ctx_make_profiles(const char * profiles_string,STACK_OF (SRTP_PROTECTION_PROFILE)** out)161 static int ssl_ctx_make_profiles(const char *profiles_string,
162 STACK_OF(SRTP_PROTECTION_PROFILE) **out) {
163 STACK_OF(SRTP_PROTECTION_PROFILE) *profiles =
164 sk_SRTP_PROTECTION_PROFILE_new_null();
165 if (profiles == NULL) {
166 OPENSSL_PUT_ERROR(SSL, SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES);
167 return 0;
168 }
169
170 const char *col;
171 const char *ptr = profiles_string;
172 do {
173 col = strchr(ptr, ':');
174
175 const SRTP_PROTECTION_PROFILE *profile;
176 if (!find_profile_by_name(ptr, &profile,
177 col ? (size_t)(col - ptr) : strlen(ptr))) {
178 OPENSSL_PUT_ERROR(SSL, SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE);
179 goto err;
180 }
181
182 if (!sk_SRTP_PROTECTION_PROFILE_push(profiles, profile)) {
183 goto err;
184 }
185
186 if (col) {
187 ptr = col + 1;
188 }
189 } while (col);
190
191 sk_SRTP_PROTECTION_PROFILE_free(*out);
192 *out = profiles;
193 return 1;
194
195 err:
196 sk_SRTP_PROTECTION_PROFILE_free(profiles);
197 return 0;
198 }
199
SSL_CTX_set_srtp_profiles(SSL_CTX * ctx,const char * profiles)200 int SSL_CTX_set_srtp_profiles(SSL_CTX *ctx, const char *profiles) {
201 return ssl_ctx_make_profiles(profiles, &ctx->srtp_profiles);
202 }
203
SSL_set_srtp_profiles(SSL * ssl,const char * profiles)204 int SSL_set_srtp_profiles(SSL *ssl, const char *profiles) {
205 return ssl_ctx_make_profiles(profiles, &ssl->srtp_profiles);
206 }
207
STACK_OF(SRTP_PROTECTION_PROFILE)208 STACK_OF(SRTP_PROTECTION_PROFILE) *SSL_get_srtp_profiles(SSL *ssl) {
209 if (ssl == NULL) {
210 return NULL;
211 }
212
213 if (ssl->srtp_profiles != NULL) {
214 return ssl->srtp_profiles;
215 }
216
217 if (ssl->ctx->srtp_profiles != NULL) {
218 return ssl->ctx->srtp_profiles;
219 }
220
221 return NULL;
222 }
223
SSL_get_selected_srtp_profile(SSL * ssl)224 const SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *ssl) {
225 return ssl->srtp_profile;
226 }
227
SSL_CTX_set_tlsext_use_srtp(SSL_CTX * ctx,const char * profiles)228 int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx, const char *profiles) {
229 /* This API inverts its return value. */
230 return !SSL_CTX_set_srtp_profiles(ctx, profiles);
231 }
232
SSL_set_tlsext_use_srtp(SSL * ssl,const char * profiles)233 int SSL_set_tlsext_use_srtp(SSL *ssl, const char *profiles) {
234 /* This API inverts its return value. */
235 return !SSL_set_srtp_profiles(ssl, profiles);
236 }
237