/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
/* ====================================================================
* Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
/*
DTLS code by Eric Rescorla <ekr@rtfm.com>
Copyright (C) 2006, Network Resonance, Inc.
Copyright (C) 2011, RTFM, Inc.
*/
#include <stdio.h>
#include <string.h>
#include <openssl/bytestring.h>
#include <openssl/err.h>
#include <openssl/obj.h>
#include "internal.h"
#include <openssl/srtp.h>
static const SRTP_PROTECTION_PROFILE srtp_known_profiles[] = {
{
"SRTP_AES128_CM_SHA1_80", SRTP_AES128_CM_SHA1_80,
},
{
"SRTP_AES128_CM_SHA1_32", SRTP_AES128_CM_SHA1_32,
},
{0},
};
static int find_profile_by_name(const char *profile_name,
const SRTP_PROTECTION_PROFILE **pptr,
size_t len) {
const SRTP_PROTECTION_PROFILE *p;
p = srtp_known_profiles;
while (p->name) {
if (len == strlen(p->name) && !strncmp(p->name, profile_name, len)) {
*pptr = p;
return 1;
}
p++;
}
return 0;
}
static int find_profile_by_num(unsigned profile_num,
const SRTP_PROTECTION_PROFILE **pptr) {
const SRTP_PROTECTION_PROFILE *p;
p = srtp_known_profiles;
while (p->name) {
if (p->id == profile_num) {
*pptr = p;
return 1;
}
p++;
}
return 0;
}
static int ssl_ctx_make_profiles(const char *profiles_string,
STACK_OF(SRTP_PROTECTION_PROFILE) **out) {
STACK_OF(SRTP_PROTECTION_PROFILE) *profiles;
const char *col;
const char *ptr = profiles_string;
profiles = sk_SRTP_PROTECTION_PROFILE_new_null();
if (profiles == NULL) {
OPENSSL_PUT_ERROR(SSL, ssl_ctx_make_profiles,
SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES);
return 0;
}
do {
const SRTP_PROTECTION_PROFILE *p;
col = strchr(ptr, ':');
if (find_profile_by_name(ptr, &p, col ? col - ptr : strlen(ptr))) {
sk_SRTP_PROTECTION_PROFILE_push(profiles, p);
} else {
OPENSSL_PUT_ERROR(SSL, ssl_ctx_make_profiles,
SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE);
return 0;
}
if (col) {
ptr = col + 1;
}
} while (col);
*out = profiles;
return 1;
}
int SSL_CTX_set_srtp_profiles(SSL_CTX *ctx, const char *profiles) {
return ssl_ctx_make_profiles(profiles, &ctx->srtp_profiles);
}
int SSL_set_srtp_profiles(SSL *s, const char *profiles) {
return ssl_ctx_make_profiles(profiles, &s->srtp_profiles);
}
STACK_OF(SRTP_PROTECTION_PROFILE) *SSL_get_srtp_profiles(SSL *s) {
if (s == NULL) {
return NULL;
}
if (s->srtp_profiles != NULL) {
return s->srtp_profiles;
}
if (s->ctx != NULL && s->ctx->srtp_profiles != NULL) {
return s->ctx->srtp_profiles;
}
return NULL;
}
const SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *s) {
return s->srtp_profile;
}
int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx, const char *profiles) {
/* This API inverts its return value. */
return !SSL_CTX_set_srtp_profiles(ctx, profiles);
}
int SSL_set_tlsext_use_srtp(SSL *s, const char *profiles) {
/* This API inverts its return value. */
return !SSL_set_srtp_profiles(s, profiles);
}
/* Note: this function returns 0 length if there are no profiles specified */
int ssl_add_clienthello_use_srtp_ext(SSL *s, uint8_t *p, int *len, int maxlen) {
int ct = 0;
int i;
STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = 0;
const SRTP_PROTECTION_PROFILE *prof;
clnt = SSL_get_srtp_profiles(s);
ct = sk_SRTP_PROTECTION_PROFILE_num(clnt); /* -1 if clnt == 0 */
if (p) {
if (ct == 0) {
OPENSSL_PUT_ERROR(SSL, ssl_add_clienthello_use_srtp_ext,
SSL_R_EMPTY_SRTP_PROTECTION_PROFILE_LIST);
return 0;
}
if (2 + ct * 2 + 1 > maxlen) {
OPENSSL_PUT_ERROR(SSL, ssl_add_clienthello_use_srtp_ext,
SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG);
return 0;
}
/* Add the length */
s2n(ct * 2, p);
for (i = 0; i < ct; i++) {
prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
s2n(prof->id, p);
}
/* Add an empty use_mki value */
*p++ = 0;
}
*len = 2 + ct * 2 + 1;
return 1;
}
int ssl_parse_clienthello_use_srtp_ext(SSL *s, CBS *cbs, int *out_alert) {
CBS profile_ids, srtp_mki;
const SRTP_PROTECTION_PROFILE *cprof, *sprof;
STACK_OF(SRTP_PROTECTION_PROFILE) *client_profiles = 0, *server_profiles;
size_t i, j;
int ret = 0;
if (!CBS_get_u16_length_prefixed(cbs, &profile_ids) ||
CBS_len(&profile_ids) < 2 ||
!CBS_get_u8_length_prefixed(cbs, &srtp_mki) ||
CBS_len(cbs) != 0) {
OPENSSL_PUT_ERROR(SSL, ssl_parse_clienthello_use_srtp_ext,
SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
*out_alert = SSL_AD_DECODE_ERROR;
goto done;
}
client_profiles = sk_SRTP_PROTECTION_PROFILE_new_null();
if (client_profiles == NULL) {
OPENSSL_PUT_ERROR(SSL, ssl_parse_clienthello_use_srtp_ext,
ERR_R_MALLOC_FAILURE);
*out_alert = SSL_AD_INTERNAL_ERROR;
goto done;
}
while (CBS_len(&profile_ids) > 0) {
uint16_t profile_id;
if (!CBS_get_u16(&profile_ids, &profile_id)) {
*out_alert = SSL_AD_DECODE_ERROR;
goto done;
}
if (find_profile_by_num(profile_id, &cprof)) {
sk_SRTP_PROTECTION_PROFILE_push(client_profiles, cprof);
}
}
/* Discard the MKI value for now. */
server_profiles = SSL_get_srtp_profiles(s);
/* Pick the server's most preferred profile. */
for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(server_profiles); i++) {
sprof = sk_SRTP_PROTECTION_PROFILE_value(server_profiles, i);
for (j = 0; j < sk_SRTP_PROTECTION_PROFILE_num(client_profiles); j++) {
cprof = sk_SRTP_PROTECTION_PROFILE_value(client_profiles, j);
if (cprof->id == sprof->id) {
s->srtp_profile = sprof;
ret = 1;
goto done;
}
}
}
ret = 1;
done:
if (client_profiles) {
sk_SRTP_PROTECTION_PROFILE_free(client_profiles);
}
return ret;
}
int ssl_add_serverhello_use_srtp_ext(SSL *s, unsigned char *p, int *len,
int maxlen) {
if (p) {
if (maxlen < 5) {
OPENSSL_PUT_ERROR(SSL, ssl_add_serverhello_use_srtp_ext,
SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG);
return 0;
}
if (s->srtp_profile == 0) {
OPENSSL_PUT_ERROR(SSL, ssl_add_serverhello_use_srtp_ext,
SSL_R_USE_SRTP_NOT_NEGOTIATED);
return 0;
}
s2n(2, p);
s2n(s->srtp_profile->id, p);
*p++ = 0;
}
*len = 5;
return 1;
}
int ssl_parse_serverhello_use_srtp_ext(SSL *s, CBS *cbs, int *out_alert) {
CBS profile_ids, srtp_mki;
uint16_t profile_id;
size_t i;
STACK_OF(SRTP_PROTECTION_PROFILE) *client_profiles;
const SRTP_PROTECTION_PROFILE *prof;
/* The extension consists of a u16-prefixed profile ID list containing a
* single uint16_t profile ID, then followed by a u8-prefixed srtp_mki field.
*
* See https://tools.ietf.org/html/rfc5764#section-4.1.1 */
if (!CBS_get_u16_length_prefixed(cbs, &profile_ids) ||
!CBS_get_u16(&profile_ids, &profile_id) || CBS_len(&profile_ids) != 0 ||
!CBS_get_u8_length_prefixed(cbs, &srtp_mki) || CBS_len(cbs) != 0) {
OPENSSL_PUT_ERROR(SSL, ssl_parse_serverhello_use_srtp_ext,
SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
*out_alert = SSL_AD_DECODE_ERROR;
return 0;
}
if (CBS_len(&srtp_mki) != 0) {
/* Must be no MKI, since we never offer one. */
OPENSSL_PUT_ERROR(SSL, ssl_parse_serverhello_use_srtp_ext,
SSL_R_BAD_SRTP_MKI_VALUE);
*out_alert = SSL_AD_ILLEGAL_PARAMETER;
return 0;
}
client_profiles = SSL_get_srtp_profiles(s);
/* Throw an error if the server gave us an unsolicited extension */
if (client_profiles == NULL) {
OPENSSL_PUT_ERROR(SSL, ssl_parse_serverhello_use_srtp_ext,
SSL_R_NO_SRTP_PROFILES);
*out_alert = SSL_AD_DECODE_ERROR;
return 0;
}
/* Check to see if the server gave us something we support
(and presumably offered). */
for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(client_profiles); i++) {
prof = sk_SRTP_PROTECTION_PROFILE_value(client_profiles, i);
if (prof->id == profile_id) {
s->srtp_profile = prof;
*out_alert = 0;
return 1;
}
}
OPENSSL_PUT_ERROR(SSL, ssl_parse_serverhello_use_srtp_ext,
SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
*out_alert = SSL_AD_ILLEGAL_PARAMETER;
return 0;
}