ssl/d1_srtp.c

   1 /*
   2  * Copyright 2011-2024 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 "quic/quic_local.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