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
127static 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
143static 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
161static 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
195err:
196  sk_SRTP_PROTECTION_PROFILE_free(profiles);
197  return 0;
198}
199
200int SSL_CTX_set_srtp_profiles(SSL_CTX *ctx, const char *profiles) {
201  return ssl_ctx_make_profiles(profiles, &ctx->srtp_profiles);
202}
203
204int SSL_set_srtp_profiles(SSL *ssl, const char *profiles) {
205  return ssl_ctx_make_profiles(profiles, &ssl->srtp_profiles);
206}
207
208STACK_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
224const SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *ssl) {
225  return ssl->srtp_profile;
226}
227
228int 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
233int 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