ssl/d1_srtp.c

   1 /*
   2  * Copyright 2011-2020 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
  20 #ifndef OPENSSL_NO_SRTP
  21
  22 static SRTP_PROTECTION_PROFILE srtp_known_profiles[] = {
  23     {
  24      "SRTP_AES128_CM_SHA1_80",
  25      SRTP_AES128_CM_SHA1_80,
  26      },
  27     {
  28      "SRTP_AES128_CM_SHA1_32",
  29      SRTP_AES128_CM_SHA1_32,
  30      },
  31     {
  32      "SRTP_AEAD_AES_128_GCM",
  33      SRTP_AEAD_AES_128_GCM,
  34      },
  35     {
  36      "SRTP_AEAD_AES_256_GCM",
  37      SRTP_AEAD_AES_256_GCM,
  38      },
  39     {
  40      "SRTP_DOUBLE_AEAD_AES_128_GCM_AEAD_AES_128_GCM",
  41      SRTP_DOUBLE_AEAD_AES_128_GCM_AEAD_AES_128_GCM,
  42      },
  43     {
  44      "SRTP_DOUBLE_AEAD_AES_256_GCM_AEAD_AES_256_GCM",
  45      SRTP_DOUBLE_AEAD_AES_256_GCM_AEAD_AES_256_GCM,
  46      },
  47     {
  48      "SRTP_ARIA_128_CTR_HMAC_SHA1_80",
  49      SRTP_ARIA_128_CTR_HMAC_SHA1_80,
  50      },
  51     {
  52      "SRTP_ARIA_128_CTR_HMAC_SHA1_32",
  53      SRTP_ARIA_128_CTR_HMAC_SHA1_32,
  54      },
  55     {
  56      "SRTP_ARIA_256_CTR_HMAC_SHA1_80",
  57      SRTP_ARIA_256_CTR_HMAC_SHA1_80,
  58      },
  59     {
  60      "SRTP_ARIA_256_CTR_HMAC_SHA1_32",
  61      SRTP_ARIA_256_CTR_HMAC_SHA1_32,
  62      },
  63     {
  64      "SRTP_AEAD_ARIA_128_GCM",
  65      SRTP_AEAD_ARIA_128_GCM,
  66      },
  67     {
  68      "SRTP_AEAD_ARIA_256_GCM",
  69      SRTP_AEAD_ARIA_256_GCM,
  70      },
  71     {0}
  72 };
  73
  74 static int find_profile_by_name(char *profile_name,
  75                                 SRTP_PROTECTION_PROFILE **pptr, size_t len)
  76 {
  77     SRTP_PROTECTION_PROFILE *p;
  78
  79     p = srtp_known_profiles;
  80     while (p->name) {
  81         if ((len == strlen(p->name))
  82             && strncmp(p->name, profile_name, len) == 0) {
  83             *pptr = p;
  84             return 0;
  85         }
  86
  87         p++;
  88     }
  89
  90     return 1;
  91 }
  92
  93 static int ssl_ctx_make_profiles(const char *profiles_string,
  94                                  STACK_OF(SRTP_PROTECTION_PROFILE) **out)
  95 {
  96     STACK_OF(SRTP_PROTECTION_PROFILE) *profiles;
  97
  98     char *col;
  99     char *ptr = (char *)profiles_string;
 100     SRTP_PROTECTION_PROFILE *p;
 101
 102     if ((profiles = sk_SRTP_PROTECTION_PROFILE_new_null()) == NULL) {
 103         ERR_raise(ERR_LIB_SSL, SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES);
 104         return 1;
 105     }
 106
 107     do {
 108         col = strchr(ptr, ':');
 109
 110         if (!find_profile_by_name(ptr, &p, col ? (size_t)(col - ptr)
 111                                                : strlen(ptr))) {
 112             if (sk_SRTP_PROTECTION_PROFILE_find(profiles, p) >= 0) {
 113                 ERR_raise(ERR_LIB_SSL, SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
 114                 goto err;
 115             }
 116
 117             if (!sk_SRTP_PROTECTION_PROFILE_push(profiles, p)) {
 118                 ERR_raise(ERR_LIB_SSL, SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES);
 119                 goto err;
 120             }
 121         } else {
 122             ERR_raise(ERR_LIB_SSL, SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE);
 123             goto err;
 124         }
 125
 126         if (col)
 127             ptr = col + 1;
 128     } while (col);
 129
 130     sk_SRTP_PROTECTION_PROFILE_free(*out);
 131
 132     *out = profiles;
 133
 134     return 0;
 135  err:
 136     sk_SRTP_PROTECTION_PROFILE_free(profiles);
 137     return 1;
 138 }
 139
 140 int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx, const char *profiles)
 141 {
 142     if (IS_QUIC_METHOD(ctx->method))
 143         return 1;
 144
 145     return ssl_ctx_make_profiles(profiles, &ctx->srtp_profiles);
 146 }
 147
 148 int SSL_set_tlsext_use_srtp(SSL *s, const char *profiles)
 149 {
 150     SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL_ONLY(s);
 151
 152     if (sc == NULL)
 153         return 1;
 154
 155     return ssl_ctx_make_profiles(profiles, &sc->srtp_profiles);
 156 }
 157
 158 STACK_OF(SRTP_PROTECTION_PROFILE) *SSL_get_srtp_profiles(SSL *s)
 159 {
 160     SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL_ONLY(s);
 161
 162     if (sc != NULL) {
 163         if (sc->srtp_profiles != NULL) {
 164             return sc->srtp_profiles;
 165         } else if ((s->ctx != NULL) && (s->ctx->srtp_profiles != NULL)) {
 166             return s->ctx->srtp_profiles;
 167         }
 168     }
 169
 170     return NULL;
 171 }
 172
 173 SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *s)
 174 {
 175     SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL_ONLY(s);
 176
 177     if (sc == NULL)
 178         return 0;
 179
 180     return sc->srtp_profile;
 181 }
 182 #endif