crypto/libressl/ssl/d1_srtp.c

   1 /* $OpenBSD: d1_srtp.c,v 1.30 2022/01/28 13:11:56 inoguchi 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 #include <openssl/opensslconf.h>
 122
 123 #ifndef OPENSSL_NO_SRTP
 124
 125 #include "bytestring.h"
 126 #include "dtls_locl.h"
 127 #include "ssl_locl.h"
 128 #include "srtp.h"
 129
 130 static const SRTP_PROTECTION_PROFILE srtp_known_profiles[] = {
 131         {
 132                 "SRTP_AES128_CM_SHA1_80",
 133                 SRTP_AES128_CM_SHA1_80,
 134         },
 135         {
 136                 "SRTP_AES128_CM_SHA1_32",
 137                 SRTP_AES128_CM_SHA1_32,
 138         },
 139         {
 140                 "SRTP_AEAD_AES_128_GCM",
 141                 SRTP_AEAD_AES_128_GCM,
 142         },
 143         {
 144                 "SRTP_AEAD_AES_256_GCM",
 145                 SRTP_AEAD_AES_256_GCM,
 146         },
 147         {0}
 148 };
 149
 150 int
 151 srtp_find_profile_by_name(const char *profile_name,
 152     const SRTP_PROTECTION_PROFILE **pptr, unsigned int len)
 153 {
 154         const SRTP_PROTECTION_PROFILE *p;
 155
 156         p = srtp_known_profiles;
 157         while (p->name) {
 158                 if ((len == strlen(p->name)) &&
 159                     !strncmp(p->name, profile_name, len)) {
 160                         *pptr = p;
 161                         return 0;
 162                 }
 163
 164                 p++;
 165         }
 166
 167         return 1;
 168 }
 169
 170 int
 171 srtp_find_profile_by_num(unsigned int profile_num,
 172     const SRTP_PROTECTION_PROFILE **pptr)
 173 {
 174         const SRTP_PROTECTION_PROFILE *p;
 175
 176         p = srtp_known_profiles;
 177         while (p->name) {
 178                 if (p->id == profile_num) {
 179                         *pptr = p;
 180                         return 0;
 181                 }
 182                 p++;
 183         }
 184
 185         return 1;
 186 }
 187
 188 static int
 189 ssl_ctx_make_profiles(const char *profiles_string,
 190     STACK_OF(SRTP_PROTECTION_PROFILE) **out)
 191 {
 192         STACK_OF(SRTP_PROTECTION_PROFILE) *profiles;
 193         char *col;
 194         const char *ptr = profiles_string;
 195         const SRTP_PROTECTION_PROFILE *p;
 196
 197         if (!(profiles = sk_SRTP_PROTECTION_PROFILE_new_null())) {
 198                 SSLerrorx(SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES);
 199                 return 1;
 200         }
 201
 202         do {
 203                 col = strchr(ptr, ':');
 204
 205                 if (!srtp_find_profile_by_name(ptr, &p,
 206                     col ? col - ptr : (int)strlen(ptr))) {
 207                         if (!sk_SRTP_PROTECTION_PROFILE_push(profiles, p)) {
 208                                 sk_SRTP_PROTECTION_PROFILE_free(profiles);
 209                                 return 1;
 210                         }
 211                 } else {
 212                         SSLerrorx(SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE);
 213                         sk_SRTP_PROTECTION_PROFILE_free(profiles);
 214                         return 1;
 215                 }
 216
 217                 if (col)
 218                         ptr = col + 1;
 219         } while (col);
 220
 221         sk_SRTP_PROTECTION_PROFILE_free(*out);
 222         *out = profiles;
 223
 224         return 0;
 225 }
 226
 227 int
 228 SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx, const char *profiles)
 229 {
 230         return ssl_ctx_make_profiles(profiles, &ctx->internal->srtp_profiles);
 231 }
 232
 233 int
 234 SSL_set_tlsext_use_srtp(SSL *s, const char *profiles)
 235 {
 236         return ssl_ctx_make_profiles(profiles, &s->internal->srtp_profiles);
 237 }
 238
 239
 240 STACK_OF(SRTP_PROTECTION_PROFILE) *
 241 SSL_get_srtp_profiles(SSL *s)
 242 {
 243         if (s != NULL) {
 244                 if (s->internal->srtp_profiles != NULL) {
 245                         return s->internal->srtp_profiles;
 246                 } else if ((s->ctx != NULL) &&
 247                     (s->ctx->internal->srtp_profiles != NULL)) {
 248                         return s->ctx->internal->srtp_profiles;
 249                 }
 250         }
 251
 252         return NULL;
 253 }
 254
 255 SRTP_PROTECTION_PROFILE *
 256 SSL_get_selected_srtp_profile(SSL *s)
 257 {
 258         /* XXX cast away the const */
 259         return (SRTP_PROTECTION_PROFILE *)s->internal->srtp_profile;
 260 }
 261
 262 #endif