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 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 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) 112 : strlen(ptr))) { 113 if (sk_SRTP_PROTECTION_PROFILE_find(profiles, 114 (SRTP_PROTECTION_PROFILE *)p) >= 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 } 142 143 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 } 150 151 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 } 160 161 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 } 175 176 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