lib/libssl/d1_srtp.c

   1 /* $OpenBSD: d1_srtp.c,v 1.22 2017/08/27 02:58:04 doug Exp $ */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2006 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /*
 112  * DTLS code by Eric Rescorla <ekr@rtfm.com>
 113  *
 114  * Copyright (C) 2006, Network Resonance, Inc.
 115  * Copyright (C) 2011, RTFM, Inc.
 116  */
 117
 118 #include <stdio.h>
 119
 120 #include <openssl/objects.h>
 121
 122 #include "ssl_locl.h"
 123
 124 #ifndef OPENSSL_NO_SRTP
 125
 126 #include "bytestring.h"
 127 #include "srtp.h"
 128
 129 static SRTP_PROTECTION_PROFILE srtp_known_profiles[] = {
 130         {
 131                 "SRTP_AES128_CM_SHA1_80",
 132                 SRTP_AES128_CM_SHA1_80,
 133         },
 134         {
 135                 "SRTP_AES128_CM_SHA1_32",
 136                 SRTP_AES128_CM_SHA1_32,
 137         },
 138         {0}
 139 };
 140
 141 int
 142 srtp_find_profile_by_name(char *profile_name, SRTP_PROTECTION_PROFILE **pptr,
 143     unsigned len)
 144 {
 145         SRTP_PROTECTION_PROFILE *p;
 146
 147         p = srtp_known_profiles;
 148         while (p->name) {
 149                 if ((len == strlen(p->name)) &&
 150                     !strncmp(p->name, profile_name, len)) {
 151                         *pptr = p;
 152                         return 0;
 153                 }
 154
 155                 p++;
 156         }
 157
 158         return 1;
 159 }
 160
 161 int
 162 srtp_find_profile_by_num(unsigned profile_num, SRTP_PROTECTION_PROFILE **pptr)
 163 {
 164         SRTP_PROTECTION_PROFILE *p;
 165
 166         p = srtp_known_profiles;
 167         while (p->name) {
 168                 if (p->id == profile_num) {
 169                         *pptr = p;
 170                         return 0;
 171                 }
 172                 p++;
 173         }
 174
 175         return 1;
 176 }
 177
 178 static int
 179 ssl_ctx_make_profiles(const char *profiles_string,
 180     STACK_OF(SRTP_PROTECTION_PROFILE) **out)
 181 {
 182         STACK_OF(SRTP_PROTECTION_PROFILE) *profiles;
 183
 184         char *col;
 185         char *ptr = (char *)profiles_string;
 186
 187         SRTP_PROTECTION_PROFILE *p;
 188
 189         if (!(profiles = sk_SRTP_PROTECTION_PROFILE_new_null())) {
 190                 SSLerrorx(SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES);
 191                 return 1;
 192         }
 193
 194         do {
 195                 col = strchr(ptr, ':');
 196
 197                 if (!srtp_find_profile_by_name(ptr, &p,
 198                     col ? col - ptr : (int)strlen(ptr))) {
 199                         sk_SRTP_PROTECTION_PROFILE_push(profiles, p);
 200                 } else {
 201                         SSLerrorx(SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE);
 202                         sk_SRTP_PROTECTION_PROFILE_free(profiles);
 203                         return 1;
 204                 }
 205
 206                 if (col)
 207                         ptr = col + 1;
 208         } while (col);
 209
 210         *out = profiles;
 211
 212         return 0;
 213 }
 214
 215 int
 216 SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx, const char *profiles)
 217 {
 218         return ssl_ctx_make_profiles(profiles, &ctx->internal->srtp_profiles);
 219 }
 220
 221 int
 222 SSL_set_tlsext_use_srtp(SSL *s, const char *profiles)
 223 {
 224         return ssl_ctx_make_profiles(profiles, &s->internal->srtp_profiles);
 225 }
 226
 227
 228 STACK_OF(SRTP_PROTECTION_PROFILE) *
 229 SSL_get_srtp_profiles(SSL *s)
 230 {
 231         if (s != NULL) {
 232                 if (s->internal->srtp_profiles != NULL) {
 233                         return s->internal->srtp_profiles;
 234                 } else if ((s->ctx != NULL) &&
 235                     (s->ctx->internal->srtp_profiles != NULL)) {
 236                         return s->ctx->internal->srtp_profiles;
 237                 }
 238         }
 239
 240         return NULL;
 241 }
 242
 243 SRTP_PROTECTION_PROFILE *
 244 SSL_get_selected_srtp_profile(SSL *s)
 245 {
 246         return s->internal->srtp_profile;
 247 }
 248
 249 #endif