2 * Copyright 2011-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 * DTLS code by Eric Rescorla <ekr@rtfm.com>
13 * Copyright (C) 2006, Network Resonance, Inc. Copyright (C) 2011, RTFM, Inc.
17 #include <openssl/objects.h>
20 #ifndef OPENSSL_NO_SRTP
22 static SRTP_PROTECTION_PROFILE srtp_known_profiles[] = {
24 "SRTP_AES128_CM_SHA1_80",
25 SRTP_AES128_CM_SHA1_80,
28 "SRTP_AES128_CM_SHA1_32",
29 SRTP_AES128_CM_SHA1_32,
32 "SRTP_AEAD_AES_128_GCM",
33 SRTP_AEAD_AES_128_GCM,
36 "SRTP_AEAD_AES_256_GCM",
37 SRTP_AEAD_AES_256_GCM,
42 static int find_profile_by_name(char *profile_name,
43 SRTP_PROTECTION_PROFILE **pptr, size_t len)
45 SRTP_PROTECTION_PROFILE *p;
47 p = srtp_known_profiles;
49 if ((len == strlen(p->name))
50 && strncmp(p->name, profile_name, len) == 0) {
61 static int ssl_ctx_make_profiles(const char *profiles_string,
62 STACK_OF(SRTP_PROTECTION_PROFILE) **out)
64 STACK_OF(SRTP_PROTECTION_PROFILE) *profiles;
67 char *ptr = (char *)profiles_string;
68 SRTP_PROTECTION_PROFILE *p;
70 if ((profiles = sk_SRTP_PROTECTION_PROFILE_new_null()) == NULL) {
71 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,
72 SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES);
77 col = strchr(ptr, ':');
79 if (!find_profile_by_name(ptr, &p, col ? (size_t)(col - ptr)
81 if (sk_SRTP_PROTECTION_PROFILE_find(profiles, p) >= 0) {
82 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,
83 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
87 if (!sk_SRTP_PROTECTION_PROFILE_push(profiles, p)) {
88 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,
89 SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES);
93 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,
94 SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE);
102 sk_SRTP_PROTECTION_PROFILE_free(*out);
108 sk_SRTP_PROTECTION_PROFILE_free(profiles);
112 int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx, const char *profiles)
114 return ssl_ctx_make_profiles(profiles, &ctx->srtp_profiles);
117 int SSL_set_tlsext_use_srtp(SSL *s, const char *profiles)
119 return ssl_ctx_make_profiles(profiles, &s->srtp_profiles);
122 STACK_OF(SRTP_PROTECTION_PROFILE) *SSL_get_srtp_profiles(SSL *s)
125 if (s->srtp_profiles != NULL) {
126 return s->srtp_profiles;
127 } else if ((s->ctx != NULL) && (s->ctx->srtp_profiles != NULL)) {
128 return s->ctx->srtp_profiles;
135 SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *s)
137 return s->srtp_profile;
140 int ssl_parse_serverhello_use_srtp_ext(SSL *s, PACKET *pkt, int *al)
142 unsigned int id, ct, mki;
145 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt;
146 SRTP_PROTECTION_PROFILE *prof;
148 if (!PACKET_get_net_2(pkt, &ct)
149 || ct != 2 || !PACKET_get_net_2(pkt, &id)
150 || !PACKET_get_1(pkt, &mki)
151 || PACKET_remaining(pkt) != 0) {
152 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,
153 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
154 *al = SSL_AD_DECODE_ERROR;
159 /* Must be no MKI, since we never offer one */
160 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,
161 SSL_R_BAD_SRTP_MKI_VALUE);
162 *al = SSL_AD_ILLEGAL_PARAMETER;
166 clnt = SSL_get_srtp_profiles(s);
168 /* Throw an error if the server gave us an unsolicited extension */
170 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,
171 SSL_R_NO_SRTP_PROFILES);
172 *al = SSL_AD_DECODE_ERROR;
177 * Check to see if the server gave us something we support (and
178 * presumably offered)
180 for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(clnt); i++) {
181 prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
183 if (prof->id == id) {
184 s->srtp_profile = prof;
190 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,
191 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
192 *al = SSL_AD_DECODE_ERROR;