ssl/d1_srtp.c

   1 /*
   2  * Copyright 2011-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   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
   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_locl.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     {0}
  40 };
  41
  42 static int find_profile_by_name(char *profile_name,
  43                                 SRTP_PROTECTION_PROFILE **pptr, size_t len)
  44 {
  45     SRTP_PROTECTION_PROFILE *p;
  46
  47     p = srtp_known_profiles;
  48     while (p->name) {
  49         if ((len == strlen(p->name))
  50             && strncmp(p->name, profile_name, len) == 0) {
  51             *pptr = p;
  52             return 0;
  53         }
  54
  55         p++;
  56     }
  57
  58     return 1;
  59 }
  60
  61 static int ssl_ctx_make_profiles(const char *profiles_string,
  62                                  STACK_OF(SRTP_PROTECTION_PROFILE) **out)
  63 {
  64     STACK_OF(SRTP_PROTECTION_PROFILE) *profiles;
  65
  66     char *col;
  67     char *ptr = (char *)profiles_string;
  68     SRTP_PROTECTION_PROFILE *p;
  69
  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);
  73         return 1;
  74     }
  75
  76     do {
  77         col = strchr(ptr, ':');
  78
  79         if (!find_profile_by_name(ptr, &p, col ? (size_t)(col - ptr)
  80                                                : strlen(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);
  84                 goto err;
  85             }
  86
  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);
  90                 goto err;
  91             }
  92         } else {
  93             SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,
  94                    SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE);
  95             goto err;
  96         }
  97
  98         if (col)
  99             ptr = col + 1;
 100     } while (col);
 101
 102     sk_SRTP_PROTECTION_PROFILE_free(*out);
 103
 104     *out = profiles;
 105
 106     return 0;
 107  err:
 108     sk_SRTP_PROTECTION_PROFILE_free(profiles);
 109     return 1;
 110 }
 111
 112 int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx, const char *profiles)
 113 {
 114     return ssl_ctx_make_profiles(profiles, &ctx->srtp_profiles);
 115 }
 116
 117 int SSL_set_tlsext_use_srtp(SSL *s, const char *profiles)
 118 {
 119     return ssl_ctx_make_profiles(profiles, &s->srtp_profiles);
 120 }
 121
 122 STACK_OF(SRTP_PROTECTION_PROFILE) *SSL_get_srtp_profiles(SSL *s)
 123 {
 124     if (s != NULL) {
 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;
 129         }
 130     }
 131
 132     return NULL;
 133 }
 134
 135 SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *s)
 136 {
 137     return s->srtp_profile;
 138 }
 139 #endif