1 /*
2 * Copyright 2011-2025 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (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
8 */
9
10 /*
11 * DTLS code by Eric Rescorla <ekr@rtfm.com>
12 *
13 * Copyright (C) 2006, Network Resonance, Inc. Copyright (C) 2011, RTFM, Inc.
14 */
15
16 #include <stdio.h>
17 #include <openssl/objects.h>
18 #include "ssl_local.h"
19 #include "internal/ssl_unwrap.h"
20
21 #ifndef OPENSSL_NO_SRTP
22
23 static const SRTP_PROTECTION_PROFILE srtp_known_profiles[] = {
24 {
25 "SRTP_AES128_CM_SHA1_80",
26 SRTP_AES128_CM_SHA1_80,
27 },
28 {
29 "SRTP_AES128_CM_SHA1_32",
30 SRTP_AES128_CM_SHA1_32,
31 },
32 {
33 "SRTP_AEAD_AES_128_GCM",
34 SRTP_AEAD_AES_128_GCM,
35 },
36 {
37 "SRTP_AEAD_AES_256_GCM",
38 SRTP_AEAD_AES_256_GCM,
39 },
40 {
41 "SRTP_DOUBLE_AEAD_AES_128_GCM_AEAD_AES_128_GCM",
42 SRTP_DOUBLE_AEAD_AES_128_GCM_AEAD_AES_128_GCM,
43 },
44 {
45 "SRTP_DOUBLE_AEAD_AES_256_GCM_AEAD_AES_256_GCM",
46 SRTP_DOUBLE_AEAD_AES_256_GCM_AEAD_AES_256_GCM,
47 },
48 {
49 "SRTP_ARIA_128_CTR_HMAC_SHA1_80",
50 SRTP_ARIA_128_CTR_HMAC_SHA1_80,
51 },
52 {
53 "SRTP_ARIA_128_CTR_HMAC_SHA1_32",
54 SRTP_ARIA_128_CTR_HMAC_SHA1_32,
55 },
56 {
57 "SRTP_ARIA_256_CTR_HMAC_SHA1_80",
58 SRTP_ARIA_256_CTR_HMAC_SHA1_80,
59 },
60 {
61 "SRTP_ARIA_256_CTR_HMAC_SHA1_32",
62 SRTP_ARIA_256_CTR_HMAC_SHA1_32,
63 },
64 {
65 "SRTP_AEAD_ARIA_128_GCM",
66 SRTP_AEAD_ARIA_128_GCM,
67 },
68 {
69 "SRTP_AEAD_ARIA_256_GCM",
70 SRTP_AEAD_ARIA_256_GCM,
71 },
72 { 0 }
73 };
74
find_profile_by_name(char * profile_name,const SRTP_PROTECTION_PROFILE ** pptr,size_t len)75 static int find_profile_by_name(char *profile_name,
76 const SRTP_PROTECTION_PROFILE **pptr, size_t len)
77 {
78 const SRTP_PROTECTION_PROFILE *p;
79
80 p = srtp_known_profiles;
81 while (p->name) {
82 if ((len == strlen(p->name))
83 && strncmp(p->name, profile_name, len) == 0) {
84 *pptr = p;
85 return 0;
86 }
87
88 p++;
89 }
90
91 return 1;
92 }
93
ssl_ctx_make_profiles(const char * profiles_string,STACK_OF (SRTP_PROTECTION_PROFILE)** out)94 static int ssl_ctx_make_profiles(const char *profiles_string,
95 STACK_OF(SRTP_PROTECTION_PROFILE) **out)
96 {
97 STACK_OF(SRTP_PROTECTION_PROFILE) *profiles;
98
99 char *col;
100 char *ptr = (char *)profiles_string;
101 const SRTP_PROTECTION_PROFILE *p;
102
103 if ((profiles = sk_SRTP_PROTECTION_PROFILE_new_null()) == NULL) {
104 ERR_raise(ERR_LIB_SSL, SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES);
105 return 1;
106 }
107
108 do {
109 col = strchr(ptr, ':');
110
111 if (!find_profile_by_name(ptr, &p, col ? (size_t)(col - ptr) : strlen(ptr))) {
112 if (sk_SRTP_PROTECTION_PROFILE_find(profiles,
113 (SRTP_PROTECTION_PROFILE *)p)
114 >= 0) {
115 ERR_raise(ERR_LIB_SSL, SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
116 goto err;
117 }
118
119 if (!sk_SRTP_PROTECTION_PROFILE_push(profiles,
120 (SRTP_PROTECTION_PROFILE *)p)) {
121 ERR_raise(ERR_LIB_SSL, SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES);
122 goto err;
123 }
124 } else {
125 ERR_raise(ERR_LIB_SSL, SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE);
126 goto err;
127 }
128
129 if (col)
130 ptr = col + 1;
131 } while (col);
132
133 sk_SRTP_PROTECTION_PROFILE_free(*out);
134
135 *out = profiles;
136
137 return 0;
138 err:
139 sk_SRTP_PROTECTION_PROFILE_free(profiles);
140 return 1;
141 }
142
SSL_CTX_set_tlsext_use_srtp(SSL_CTX * ctx,const char * profiles)143 int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx, const char *profiles)
144 {
145 if (IS_QUIC_METHOD(ctx->method))
146 return 1;
147
148 return ssl_ctx_make_profiles(profiles, &ctx->srtp_profiles);
149 }
150
SSL_set_tlsext_use_srtp(SSL * s,const char * profiles)151 int SSL_set_tlsext_use_srtp(SSL *s, const char *profiles)
152 {
153 SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL_ONLY(s);
154
155 if (sc == NULL)
156 return 1;
157
158 return ssl_ctx_make_profiles(profiles, &sc->srtp_profiles);
159 }
160
STACK_OF(SRTP_PROTECTION_PROFILE)161 STACK_OF(SRTP_PROTECTION_PROFILE) *SSL_get_srtp_profiles(SSL *s)
162 {
163 SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL_ONLY(s);
164
165 if (sc != NULL) {
166 if (sc->srtp_profiles != NULL) {
167 return sc->srtp_profiles;
168 } else if ((s->ctx != NULL) && (s->ctx->srtp_profiles != NULL)) {
169 return s->ctx->srtp_profiles;
170 }
171 }
172
173 return NULL;
174 }
175
SSL_get_selected_srtp_profile(SSL * s)176 SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *s)
177 {
178 SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL_ONLY(s);
179
180 if (sc == NULL)
181 return 0;
182
183 return sc->srtp_profile;
184 }
185 #endif
186