426 lines
14 KiB
C
426 lines
14 KiB
C
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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/* ====================================================================
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* Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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/*
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* DTLS code by Eric Rescorla <ekr@rtfm.com>
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*
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* Copyright (C) 2006, Network Resonance, Inc. Copyright (C) 2011, RTFM, Inc.
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*/
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#include <stdio.h>
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#include <openssl/objects.h>
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#include "ssl_locl.h"
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#ifndef OPENSSL_NO_SRTP
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static SRTP_PROTECTION_PROFILE srtp_known_profiles[] = {
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{
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"SRTP_AES128_CM_SHA1_80",
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SRTP_AES128_CM_SHA1_80,
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},
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{
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"SRTP_AES128_CM_SHA1_32",
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SRTP_AES128_CM_SHA1_32,
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},
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{
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"SRTP_AEAD_AES_128_GCM",
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SRTP_AEAD_AES_128_GCM
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},
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{
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"SRTP_AEAD_AES_256_GCM",
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SRTP_AEAD_AES_256_GCM
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},
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{0}
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};
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static int find_profile_by_name(char *profile_name,
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SRTP_PROTECTION_PROFILE **pptr, unsigned len)
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{
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SRTP_PROTECTION_PROFILE *p;
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p = srtp_known_profiles;
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while (p->name) {
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if ((len == strlen(p->name))
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&& strncmp(p->name, profile_name, len) == 0) {
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*pptr = p;
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return 0;
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}
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p++;
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}
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return 1;
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}
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static int ssl_ctx_make_profiles(const char *profiles_string,
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STACK_OF(SRTP_PROTECTION_PROFILE) **out)
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{
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STACK_OF(SRTP_PROTECTION_PROFILE) *profiles;
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char *col;
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char *ptr = (char *)profiles_string;
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SRTP_PROTECTION_PROFILE *p;
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if ((profiles = sk_SRTP_PROTECTION_PROFILE_new_null()) == NULL) {
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SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,
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SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES);
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return 1;
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}
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do {
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col = strchr(ptr, ':');
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if (!find_profile_by_name(ptr, &p,
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col ? col - ptr : (int)strlen(ptr))) {
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if (sk_SRTP_PROTECTION_PROFILE_find(profiles, p) >= 0) {
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SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,
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SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
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sk_SRTP_PROTECTION_PROFILE_free(profiles);
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return 1;
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}
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sk_SRTP_PROTECTION_PROFILE_push(profiles, p);
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} else {
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SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,
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SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE);
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sk_SRTP_PROTECTION_PROFILE_free(profiles);
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return 1;
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}
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if (col)
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ptr = col + 1;
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} while (col);
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*out = profiles;
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return 0;
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}
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int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx, const char *profiles)
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{
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return ssl_ctx_make_profiles(profiles, &ctx->srtp_profiles);
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}
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int SSL_set_tlsext_use_srtp(SSL *s, const char *profiles)
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{
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return ssl_ctx_make_profiles(profiles, &s->srtp_profiles);
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}
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STACK_OF(SRTP_PROTECTION_PROFILE) *SSL_get_srtp_profiles(SSL *s)
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{
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if (s != NULL) {
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if (s->srtp_profiles != NULL) {
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return s->srtp_profiles;
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} else if ((s->ctx != NULL) && (s->ctx->srtp_profiles != NULL)) {
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return s->ctx->srtp_profiles;
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}
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}
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return NULL;
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}
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SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *s)
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{
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return s->srtp_profile;
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}
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/*
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* Note: this function returns 0 length if there are no profiles specified
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*/
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int ssl_add_clienthello_use_srtp_ext(SSL *s, unsigned char *p, int *len,
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int maxlen)
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{
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int ct = 0;
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int i;
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STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = 0;
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SRTP_PROTECTION_PROFILE *prof;
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clnt = SSL_get_srtp_profiles(s);
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ct = sk_SRTP_PROTECTION_PROFILE_num(clnt); /* -1 if clnt == 0 */
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if (p) {
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if (ct == 0) {
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SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT,
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SSL_R_EMPTY_SRTP_PROTECTION_PROFILE_LIST);
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return 1;
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}
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if ((2 + ct * 2 + 1) > maxlen) {
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SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT,
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SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG);
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return 1;
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}
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/* Add the length */
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s2n(ct * 2, p);
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for (i = 0; i < ct; i++) {
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prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
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s2n(prof->id, p);
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}
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/* Add an empty use_mki value */
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*p++ = 0;
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}
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*len = 2 + ct * 2 + 1;
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return 0;
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}
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int ssl_parse_clienthello_use_srtp_ext(SSL *s, PACKET *pkt, int *al)
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{
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SRTP_PROTECTION_PROFILE *sprof;
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STACK_OF(SRTP_PROTECTION_PROFILE) *srvr;
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unsigned int ct, mki_len, id;
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int i, srtp_pref;
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PACKET subpkt;
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/* Pull off the length of the cipher suite list and check it is even */
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if (!PACKET_get_net_2(pkt, &ct)
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|| (ct & 1) != 0
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|| !PACKET_get_sub_packet(pkt, &subpkt, ct)) {
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SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,
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SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
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*al = SSL_AD_DECODE_ERROR;
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return 1;
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}
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srvr = SSL_get_srtp_profiles(s);
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s->srtp_profile = NULL;
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/* Search all profiles for a match initially */
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srtp_pref = sk_SRTP_PROTECTION_PROFILE_num(srvr);
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while (PACKET_remaining(&subpkt)) {
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if (!PACKET_get_net_2(&subpkt, &id)) {
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SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,
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SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
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*al = SSL_AD_DECODE_ERROR;
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return 1;
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}
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/*
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* Only look for match in profiles of higher preference than
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* current match.
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* If no profiles have been have been configured then this
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* does nothing.
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*/
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for (i = 0; i < srtp_pref; i++) {
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sprof = sk_SRTP_PROTECTION_PROFILE_value(srvr, i);
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if (sprof->id == id) {
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s->srtp_profile = sprof;
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srtp_pref = i;
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break;
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}
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}
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}
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/*
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* Now extract the MKI value as a sanity check, but discard it for now
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*/
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if (!PACKET_get_1(pkt, &mki_len)) {
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SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,
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SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
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*al = SSL_AD_DECODE_ERROR;
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return 1;
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}
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if (!PACKET_forward(pkt, mki_len)
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|| PACKET_remaining(pkt)) {
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SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,
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SSL_R_BAD_SRTP_MKI_VALUE);
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*al = SSL_AD_DECODE_ERROR;
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return 1;
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}
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return 0;
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}
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int ssl_add_serverhello_use_srtp_ext(SSL *s, unsigned char *p, int *len,
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int maxlen)
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{
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if (p) {
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if (maxlen < 5) {
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SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT,
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SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG);
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return 1;
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}
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if (s->srtp_profile == 0) {
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SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT,
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SSL_R_USE_SRTP_NOT_NEGOTIATED);
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return 1;
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}
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s2n(2, p);
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s2n(s->srtp_profile->id, p);
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*p++ = 0;
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}
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*len = 5;
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return 0;
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}
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int ssl_parse_serverhello_use_srtp_ext(SSL *s, PACKET *pkt, int *al)
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{
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unsigned int id, ct, mki;
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int i;
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STACK_OF(SRTP_PROTECTION_PROFILE) *clnt;
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SRTP_PROTECTION_PROFILE *prof;
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if (!PACKET_get_net_2(pkt, &ct)
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|| ct != 2
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|| !PACKET_get_net_2(pkt, &id)
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|| !PACKET_get_1(pkt, &mki)
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|| PACKET_remaining(pkt) != 0) {
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SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,
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SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
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*al = SSL_AD_DECODE_ERROR;
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return 1;
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}
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if (mki != 0) {
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/* Must be no MKI, since we never offer one */
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SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,
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SSL_R_BAD_SRTP_MKI_VALUE);
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*al = SSL_AD_ILLEGAL_PARAMETER;
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return 1;
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}
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clnt = SSL_get_srtp_profiles(s);
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/* Throw an error if the server gave us an unsolicited extension */
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if (clnt == NULL) {
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SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,
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SSL_R_NO_SRTP_PROFILES);
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*al = SSL_AD_DECODE_ERROR;
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return 1;
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}
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/*
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* Check to see if the server gave us something we support (and
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* presumably offered)
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*/
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for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(clnt); i++) {
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prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
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if (prof->id == id) {
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s->srtp_profile = prof;
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*al = 0;
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return 0;
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}
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}
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SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,
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SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
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*al = SSL_AD_DECODE_ERROR;
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return 1;
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}
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#endif
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