301 lines
10 KiB
C
301 lines
10 KiB
C
/* ssl/t1_ext.c */
|
|
/* ====================================================================
|
|
* Copyright (c) 2014 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).
|
|
*
|
|
*/
|
|
|
|
/* Custom extension utility functions */
|
|
|
|
#include "ssl_locl.h"
|
|
|
|
#ifndef OPENSSL_NO_TLSEXT
|
|
|
|
/* Find a custom extension from the list. */
|
|
static custom_ext_method *custom_ext_find(custom_ext_methods *exts,
|
|
unsigned int ext_type)
|
|
{
|
|
size_t i;
|
|
custom_ext_method *meth = exts->meths;
|
|
for (i = 0; i < exts->meths_count; i++, meth++) {
|
|
if (ext_type == meth->ext_type)
|
|
return meth;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Initialise custom extensions flags to indicate neither sent nor received.
|
|
*/
|
|
void custom_ext_init(custom_ext_methods *exts)
|
|
{
|
|
size_t i;
|
|
custom_ext_method *meth = exts->meths;
|
|
for (i = 0; i < exts->meths_count; i++, meth++)
|
|
meth->ext_flags = 0;
|
|
}
|
|
|
|
/* Pass received custom extension data to the application for parsing. */
|
|
int custom_ext_parse(SSL *s, int server,
|
|
unsigned int ext_type,
|
|
const unsigned char *ext_data, size_t ext_size, int *al)
|
|
{
|
|
custom_ext_methods *exts = server ? &s->cert->srv_ext : &s->cert->cli_ext;
|
|
custom_ext_method *meth;
|
|
meth = custom_ext_find(exts, ext_type);
|
|
/* If not found return success */
|
|
if (!meth)
|
|
return 1;
|
|
if (!server) {
|
|
/*
|
|
* If it's ServerHello we can't have any extensions not sent in
|
|
* ClientHello.
|
|
*/
|
|
if (!(meth->ext_flags & SSL_EXT_FLAG_SENT)) {
|
|
*al = TLS1_AD_UNSUPPORTED_EXTENSION;
|
|
return 0;
|
|
}
|
|
}
|
|
/* If already present it's a duplicate */
|
|
if (meth->ext_flags & SSL_EXT_FLAG_RECEIVED) {
|
|
*al = TLS1_AD_DECODE_ERROR;
|
|
return 0;
|
|
}
|
|
meth->ext_flags |= SSL_EXT_FLAG_RECEIVED;
|
|
/* If no parse function set return success */
|
|
if (!meth->parse_cb)
|
|
return 1;
|
|
|
|
return meth->parse_cb(s, ext_type, ext_data, ext_size, al,
|
|
meth->parse_arg);
|
|
}
|
|
|
|
/*
|
|
* Request custom extension data from the application and add to the return
|
|
* buffer.
|
|
*/
|
|
int custom_ext_add(SSL *s, int server,
|
|
unsigned char **pret, unsigned char *limit, int *al)
|
|
{
|
|
custom_ext_methods *exts = server ? &s->cert->srv_ext : &s->cert->cli_ext;
|
|
custom_ext_method *meth;
|
|
unsigned char *ret = *pret;
|
|
size_t i;
|
|
|
|
for (i = 0; i < exts->meths_count; i++) {
|
|
const unsigned char *out = NULL;
|
|
size_t outlen = 0;
|
|
meth = exts->meths + i;
|
|
|
|
if (server) {
|
|
/*
|
|
* For ServerHello only send extensions present in ClientHello.
|
|
*/
|
|
if (!(meth->ext_flags & SSL_EXT_FLAG_RECEIVED))
|
|
continue;
|
|
/* If callback absent for server skip it */
|
|
if (!meth->add_cb)
|
|
continue;
|
|
}
|
|
if (meth->add_cb) {
|
|
int cb_retval = 0;
|
|
cb_retval = meth->add_cb(s, meth->ext_type,
|
|
&out, &outlen, al, meth->add_arg);
|
|
if (cb_retval < 0)
|
|
return 0; /* error */
|
|
if (cb_retval == 0)
|
|
continue; /* skip this extension */
|
|
}
|
|
if (4 > limit - ret || outlen > (size_t)(limit - ret - 4))
|
|
return 0;
|
|
s2n(meth->ext_type, ret);
|
|
s2n(outlen, ret);
|
|
if (outlen) {
|
|
memcpy(ret, out, outlen);
|
|
ret += outlen;
|
|
}
|
|
/*
|
|
* We can't send duplicates: code logic should prevent this.
|
|
*/
|
|
OPENSSL_assert(!(meth->ext_flags & SSL_EXT_FLAG_SENT));
|
|
/*
|
|
* Indicate extension has been sent: this is both a sanity check to
|
|
* ensure we don't send duplicate extensions and indicates that it is
|
|
* not an error if the extension is present in ServerHello.
|
|
*/
|
|
meth->ext_flags |= SSL_EXT_FLAG_SENT;
|
|
if (meth->free_cb)
|
|
meth->free_cb(s, meth->ext_type, out, meth->add_arg);
|
|
}
|
|
*pret = ret;
|
|
return 1;
|
|
}
|
|
|
|
/* Copy table of custom extensions */
|
|
int custom_exts_copy(custom_ext_methods *dst, const custom_ext_methods *src)
|
|
{
|
|
if (src->meths_count) {
|
|
dst->meths =
|
|
BUF_memdup(src->meths,
|
|
sizeof(custom_ext_method) * src->meths_count);
|
|
if (dst->meths == NULL)
|
|
return 0;
|
|
dst->meths_count = src->meths_count;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
void custom_exts_free(custom_ext_methods *exts)
|
|
{
|
|
if (exts->meths)
|
|
OPENSSL_free(exts->meths);
|
|
}
|
|
|
|
/* Set callbacks for a custom extension. */
|
|
static int custom_ext_meth_add(custom_ext_methods *exts,
|
|
unsigned int ext_type,
|
|
custom_ext_add_cb add_cb,
|
|
custom_ext_free_cb free_cb,
|
|
void *add_arg,
|
|
custom_ext_parse_cb parse_cb, void *parse_arg)
|
|
{
|
|
custom_ext_method *meth;
|
|
/*
|
|
* Check application error: if add_cb is not set free_cb will never be
|
|
* called.
|
|
*/
|
|
if (!add_cb && free_cb)
|
|
return 0;
|
|
/* Don't add if extension supported internally. */
|
|
if (SSL_extension_supported(ext_type))
|
|
return 0;
|
|
/* Extension type must fit in 16 bits */
|
|
if (ext_type > 0xffff)
|
|
return 0;
|
|
/* Search for duplicate */
|
|
if (custom_ext_find(exts, ext_type))
|
|
return 0;
|
|
exts->meths = OPENSSL_realloc(exts->meths,
|
|
(exts->meths_count +
|
|
1) * sizeof(custom_ext_method));
|
|
|
|
if (!exts->meths) {
|
|
exts->meths_count = 0;
|
|
return 0;
|
|
}
|
|
|
|
meth = exts->meths + exts->meths_count;
|
|
memset(meth, 0, sizeof(custom_ext_method));
|
|
meth->parse_cb = parse_cb;
|
|
meth->add_cb = add_cb;
|
|
meth->free_cb = free_cb;
|
|
meth->ext_type = ext_type;
|
|
meth->add_arg = add_arg;
|
|
meth->parse_arg = parse_arg;
|
|
exts->meths_count++;
|
|
return 1;
|
|
}
|
|
|
|
/* Application level functions to add custom extension callbacks */
|
|
int SSL_CTX_add_client_custom_ext(SSL_CTX *ctx, unsigned int ext_type,
|
|
custom_ext_add_cb add_cb,
|
|
custom_ext_free_cb free_cb,
|
|
void *add_arg,
|
|
custom_ext_parse_cb parse_cb,
|
|
void *parse_arg)
|
|
{
|
|
return custom_ext_meth_add(&ctx->cert->cli_ext, ext_type,
|
|
add_cb, free_cb, add_arg, parse_cb, parse_arg);
|
|
}
|
|
|
|
int SSL_CTX_add_server_custom_ext(SSL_CTX *ctx, unsigned int ext_type,
|
|
custom_ext_add_cb add_cb,
|
|
custom_ext_free_cb free_cb,
|
|
void *add_arg,
|
|
custom_ext_parse_cb parse_cb,
|
|
void *parse_arg)
|
|
{
|
|
return custom_ext_meth_add(&ctx->cert->srv_ext, ext_type,
|
|
add_cb, free_cb, add_arg, parse_cb, parse_arg);
|
|
}
|
|
|
|
int SSL_extension_supported(unsigned int ext_type)
|
|
{
|
|
switch (ext_type) {
|
|
/* Internally supported extensions. */
|
|
case TLSEXT_TYPE_application_layer_protocol_negotiation:
|
|
case TLSEXT_TYPE_ec_point_formats:
|
|
case TLSEXT_TYPE_elliptic_curves:
|
|
case TLSEXT_TYPE_heartbeat:
|
|
# ifndef OPENSSL_NO_NEXTPROTONEG
|
|
case TLSEXT_TYPE_next_proto_neg:
|
|
# endif
|
|
case TLSEXT_TYPE_padding:
|
|
case TLSEXT_TYPE_renegotiate:
|
|
case TLSEXT_TYPE_server_name:
|
|
case TLSEXT_TYPE_session_ticket:
|
|
case TLSEXT_TYPE_signature_algorithms:
|
|
case TLSEXT_TYPE_srp:
|
|
case TLSEXT_TYPE_status_request:
|
|
case TLSEXT_TYPE_use_srtp:
|
|
# ifdef TLSEXT_TYPE_opaque_prf_input
|
|
case TLSEXT_TYPE_opaque_prf_input:
|
|
# endif
|
|
# ifdef TLSEXT_TYPE_encrypt_then_mac
|
|
case TLSEXT_TYPE_encrypt_then_mac:
|
|
# endif
|
|
return 1;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
#endif
|