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