70bd80a236
The under 32 constraint is silly; it's to check for duplicate curves in library-supplied configuration. That API is new as of 1.0.2. It doesn't seem worth bothering; if the caller supplies a repeated value, may as well emit a repeated one and so be it. (Probably no one will ever call that function outside of maybe test code anyway.) While I'm here, remove the 0 constraint too. It's not likely to change, but removing the return value overload seems easier than keeping comments about it comments about it. Change-Id: I01d36dba1855873875bb5a0ec84b040199e0e9bc Reviewed-on: https://boringssl-review.googlesource.com/2844 Reviewed-by: Adam Langley <agl@google.com>
2808 lines
89 KiB
C
2808 lines
89 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
|
|
* 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) 1998-2007 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
|
|
* 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
|
|
* 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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* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
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*
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* Portions of the attached software ("Contribution") are developed by
|
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* SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
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*
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* The Contribution is licensed pursuant to the OpenSSL open source
|
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* license provided above.
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*
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* ECC cipher suite support in OpenSSL originally written by
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* Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
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*
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*/
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/* ====================================================================
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* Copyright 2005 Nokia. All rights reserved.
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*
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* The portions of the attached software ("Contribution") is developed by
|
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* Nokia Corporation and is licensed pursuant to the OpenSSL open source
|
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* license.
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*
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* The Contribution, originally written by Mika Kousa and Pasi Eronen of
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* Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
|
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* support (see RFC 4279) to OpenSSL.
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*
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* No patent licenses or other rights except those expressly stated in
|
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* the OpenSSL open source license shall be deemed granted or received
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* expressly, by implication, estoppel, or otherwise.
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*
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* No assurances are provided by Nokia that the Contribution does not
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* infringe the patent or other intellectual property rights of any third
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* party or that the license provides you with all the necessary rights
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* to make use of the Contribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
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* ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
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* SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
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* OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
|
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* OTHERWISE. */
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#define NETSCAPE_HANG_BUG
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#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#include <openssl/bn.h>
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#include <openssl/buf.h>
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#include <openssl/bytestring.h>
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#include <openssl/cipher.h>
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#include <openssl/dh.h>
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#include <openssl/ec.h>
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#include <openssl/ecdsa.h>
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#include <openssl/evp.h>
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#include <openssl/hmac.h>
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#include <openssl/md5.h>
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#include <openssl/mem.h>
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#include <openssl/obj.h>
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#include <openssl/rand.h>
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#include <openssl/sha.h>
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#include <openssl/x509.h>
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#include "ssl_locl.h"
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#include "../crypto/internal.h"
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#include "../crypto/dh/internal.h"
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/* INITIAL_SNIFF_BUFFER_SIZE is the number of bytes read in the initial sniff
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* buffer. */
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#define INITIAL_SNIFF_BUFFER_SIZE 8
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int ssl3_accept(SSL *s) {
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BUF_MEM *buf = NULL;
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unsigned long alg_a;
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void (*cb)(const SSL *ssl, int type, int val) = NULL;
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int ret = -1;
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int new_state, state, skip = 0;
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assert(s->handshake_func == ssl3_accept);
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assert(s->server);
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assert(!SSL_IS_DTLS(s));
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ERR_clear_error();
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ERR_clear_system_error();
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if (s->info_callback != NULL) {
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cb = s->info_callback;
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} else if (s->ctx->info_callback != NULL) {
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cb = s->ctx->info_callback;
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}
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s->in_handshake++;
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if (s->cert == NULL) {
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OPENSSL_PUT_ERROR(SSL, ssl3_accept, SSL_R_NO_CERTIFICATE_SET);
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return -1;
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}
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for (;;) {
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state = s->state;
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switch (s->state) {
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case SSL_ST_RENEGOTIATE:
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/* This state is the renegotiate entry point. It sends a HelloRequest
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* and nothing else. */
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s->renegotiate = 1;
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if (cb != NULL) {
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cb(s, SSL_CB_HANDSHAKE_START, 1);
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}
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if (s->init_buf == NULL) {
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buf = BUF_MEM_new();
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if (!buf || !BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
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ret = -1;
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goto end;
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}
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s->init_buf = buf;
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buf = NULL;
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}
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s->init_num = 0;
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if (!ssl3_setup_buffers(s)) {
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ret = -1;
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goto end;
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}
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if (!s->s3->send_connection_binding &&
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!(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) {
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/* Server attempting to renegotiate with client that doesn't support
|
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* secure renegotiation. */
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OPENSSL_PUT_ERROR(SSL, ssl3_accept,
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SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
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ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
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ret = -1;
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goto end;
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}
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s->ctx->stats.sess_accept_renegotiate++;
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s->state = SSL3_ST_SW_HELLO_REQ_A;
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break;
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|
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case SSL3_ST_SW_HELLO_REQ_A:
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case SSL3_ST_SW_HELLO_REQ_B:
|
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s->shutdown = 0;
|
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ret = ssl3_send_hello_request(s);
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if (ret <= 0) {
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goto end;
|
|
}
|
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s->s3->tmp.next_state = SSL3_ST_SW_HELLO_REQ_C;
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s->state = SSL3_ST_SW_FLUSH;
|
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s->init_num = 0;
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|
|
if (!ssl3_init_finished_mac(s)) {
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OPENSSL_PUT_ERROR(SSL, ssl3_accept, ERR_R_INTERNAL_ERROR);
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ret = -1;
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goto end;
|
|
}
|
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break;
|
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|
|
case SSL3_ST_SW_HELLO_REQ_C:
|
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s->state = SSL_ST_OK;
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break;
|
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|
|
case SSL_ST_ACCEPT:
|
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case SSL_ST_BEFORE | SSL_ST_ACCEPT:
|
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/* This state is the entry point for the handshake itself (initial and
|
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* renegotiation). */
|
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if (cb != NULL) {
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cb(s, SSL_CB_HANDSHAKE_START, 1);
|
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}
|
|
|
|
if (s->init_buf == NULL) {
|
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buf = BUF_MEM_new();
|
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if (!buf || !BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
|
|
ret = -1;
|
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goto end;
|
|
}
|
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s->init_buf = buf;
|
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buf = NULL;
|
|
}
|
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s->init_num = 0;
|
|
|
|
if (!ssl3_init_finished_mac(s)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_accept, ERR_R_INTERNAL_ERROR);
|
|
ret = -1;
|
|
goto end;
|
|
}
|
|
|
|
if (!s->s3->have_version) {
|
|
/* This is the initial handshake. The record layer has not been
|
|
* initialized yet. Sniff for a V2ClientHello before reading a
|
|
* ClientHello normally. */
|
|
assert(s->s3->rbuf.buf == NULL);
|
|
assert(s->s3->wbuf.buf == NULL);
|
|
s->state = SSL3_ST_SR_INITIAL_BYTES;
|
|
} else {
|
|
/* Enable a write buffer. This groups handshake messages within a
|
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* flight into a single write. */
|
|
if (!ssl3_setup_buffers(s) || !ssl_init_wbio_buffer(s, 1)) {
|
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ret = -1;
|
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goto end;
|
|
}
|
|
s->state = SSL3_ST_SR_CLNT_HELLO_A;
|
|
}
|
|
s->ctx->stats.sess_accept++;
|
|
break;
|
|
|
|
case SSL3_ST_SR_INITIAL_BYTES:
|
|
ret = ssl3_get_initial_bytes(s);
|
|
if (ret <= 0) {
|
|
goto end;
|
|
}
|
|
/* ssl3_get_initial_bytes sets s->state to one of
|
|
* SSL3_ST_SR_V2_CLIENT_HELLO or SSL3_ST_SR_CLNT_HELLO_A on success. */
|
|
break;
|
|
|
|
case SSL3_ST_SR_V2_CLIENT_HELLO:
|
|
ret = ssl3_get_v2_client_hello(s);
|
|
if (ret <= 0) {
|
|
goto end;
|
|
}
|
|
s->state = SSL3_ST_SR_CLNT_HELLO_A;
|
|
break;
|
|
|
|
case SSL3_ST_SR_CLNT_HELLO_A:
|
|
case SSL3_ST_SR_CLNT_HELLO_B:
|
|
case SSL3_ST_SR_CLNT_HELLO_C:
|
|
case SSL3_ST_SR_CLNT_HELLO_D:
|
|
s->shutdown = 0;
|
|
ret = ssl3_get_client_hello(s);
|
|
if (ret == PENDING_SESSION) {
|
|
s->rwstate = SSL_PENDING_SESSION;
|
|
goto end;
|
|
}
|
|
if (ret == CERTIFICATE_SELECTION_PENDING) {
|
|
s->rwstate = SSL_CERTIFICATE_SELECTION_PENDING;
|
|
goto end;
|
|
}
|
|
if (ret <= 0) {
|
|
goto end;
|
|
}
|
|
s->renegotiate = 2;
|
|
s->state = SSL3_ST_SW_SRVR_HELLO_A;
|
|
s->init_num = 0;
|
|
break;
|
|
|
|
case SSL3_ST_SW_SRVR_HELLO_A:
|
|
case SSL3_ST_SW_SRVR_HELLO_B:
|
|
ret = ssl3_send_server_hello(s);
|
|
if (ret <= 0) {
|
|
goto end;
|
|
}
|
|
if (s->hit) {
|
|
if (s->tlsext_ticket_expected) {
|
|
s->state = SSL3_ST_SW_SESSION_TICKET_A;
|
|
} else {
|
|
s->state = SSL3_ST_SW_CHANGE_A;
|
|
}
|
|
} else {
|
|
s->state = SSL3_ST_SW_CERT_A;
|
|
}
|
|
s->init_num = 0;
|
|
break;
|
|
|
|
case SSL3_ST_SW_CERT_A:
|
|
case SSL3_ST_SW_CERT_B:
|
|
if (ssl_cipher_has_server_public_key(s->s3->tmp.new_cipher)) {
|
|
ret = ssl3_send_server_certificate(s);
|
|
if (ret <= 0) {
|
|
goto end;
|
|
}
|
|
if (s->s3->tmp.certificate_status_expected) {
|
|
s->state = SSL3_ST_SW_CERT_STATUS_A;
|
|
} else {
|
|
s->state = SSL3_ST_SW_KEY_EXCH_A;
|
|
}
|
|
} else {
|
|
skip = 1;
|
|
s->state = SSL3_ST_SW_KEY_EXCH_A;
|
|
}
|
|
s->init_num = 0;
|
|
break;
|
|
|
|
case SSL3_ST_SW_KEY_EXCH_A:
|
|
case SSL3_ST_SW_KEY_EXCH_B:
|
|
alg_a = s->s3->tmp.new_cipher->algorithm_auth;
|
|
|
|
/* Send a ServerKeyExchange message if:
|
|
* - The key exchange is ephemeral or anonymous
|
|
* Diffie-Hellman.
|
|
* - There is a PSK identity hint.
|
|
*
|
|
* TODO(davidben): This logic is currently duplicated in d1_srvr.c. Fix
|
|
* this. In the meantime, keep them in sync. */
|
|
if (ssl_cipher_requires_server_key_exchange(s->s3->tmp.new_cipher) ||
|
|
((alg_a & SSL_aPSK) && s->psk_identity_hint)) {
|
|
ret = ssl3_send_server_key_exchange(s);
|
|
if (ret <= 0)
|
|
goto end;
|
|
} else {
|
|
skip = 1;
|
|
}
|
|
|
|
s->state = SSL3_ST_SW_CERT_REQ_A;
|
|
s->init_num = 0;
|
|
break;
|
|
|
|
case SSL3_ST_SW_CERT_REQ_A:
|
|
case SSL3_ST_SW_CERT_REQ_B:
|
|
if (/* don't request cert unless asked for it: */
|
|
!(s->verify_mode & SSL_VERIFY_PEER) ||
|
|
/* Don't request a certificate if an obc was presented */
|
|
((s->verify_mode & SSL_VERIFY_PEER_IF_NO_OBC) &&
|
|
s->s3->tlsext_channel_id_valid) ||
|
|
/* if SSL_VERIFY_CLIENT_ONCE is set,
|
|
* don't request cert during re-negotiation: */
|
|
((s->session->peer != NULL) &&
|
|
(s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
|
|
/* never request cert in anonymous ciphersuites
|
|
* (see section "Certificate request" in SSL 3 drafts
|
|
* and in RFC 2246): */
|
|
((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
|
|
/* ... except when the application insists on verification
|
|
* (against the specs, but s3_clnt.c accepts this for SSL 3) */
|
|
!(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
|
|
/* With normal PSK Certificates and
|
|
* Certificate Requests are omitted */
|
|
(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
|
|
/* no cert request */
|
|
skip = 1;
|
|
s->s3->tmp.cert_request = 0;
|
|
s->state = SSL3_ST_SW_SRVR_DONE_A;
|
|
if (s->s3->handshake_buffer &&
|
|
!ssl3_digest_cached_records(s, free_handshake_buffer)) {
|
|
return -1;
|
|
}
|
|
} else {
|
|
s->s3->tmp.cert_request = 1;
|
|
ret = ssl3_send_certificate_request(s);
|
|
if (ret <= 0) {
|
|
goto end;
|
|
}
|
|
#ifndef NETSCAPE_HANG_BUG
|
|
s->state = SSL3_ST_SW_SRVR_DONE_A;
|
|
#else
|
|
/* ServerHelloDone was already sent in the
|
|
* previous record. */
|
|
s->state = SSL3_ST_SW_FLUSH;
|
|
s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
|
|
#endif
|
|
s->init_num = 0;
|
|
}
|
|
break;
|
|
|
|
case SSL3_ST_SW_SRVR_DONE_A:
|
|
case SSL3_ST_SW_SRVR_DONE_B:
|
|
ret = ssl3_send_server_done(s);
|
|
if (ret <= 0) {
|
|
goto end;
|
|
}
|
|
s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
|
|
s->state = SSL3_ST_SW_FLUSH;
|
|
s->init_num = 0;
|
|
break;
|
|
|
|
case SSL3_ST_SW_FLUSH:
|
|
/* This code originally checked to see if any data was pending using
|
|
* BIO_CTRL_INFO and then flushed. This caused problems as documented
|
|
* in PR#1939. The proposed fix doesn't completely resolve this issue
|
|
* as buggy implementations of BIO_CTRL_PENDING still exist. So instead
|
|
* we just flush unconditionally. */
|
|
s->rwstate = SSL_WRITING;
|
|
if (BIO_flush(s->wbio) <= 0) {
|
|
ret = -1;
|
|
goto end;
|
|
}
|
|
s->rwstate = SSL_NOTHING;
|
|
|
|
s->state = s->s3->tmp.next_state;
|
|
break;
|
|
|
|
case SSL3_ST_SR_CERT_A:
|
|
case SSL3_ST_SR_CERT_B:
|
|
if (s->s3->tmp.cert_request) {
|
|
ret = ssl3_get_client_certificate(s);
|
|
if (ret <= 0) {
|
|
goto end;
|
|
}
|
|
}
|
|
s->init_num = 0;
|
|
s->state = SSL3_ST_SR_KEY_EXCH_A;
|
|
break;
|
|
|
|
case SSL3_ST_SR_KEY_EXCH_A:
|
|
case SSL3_ST_SR_KEY_EXCH_B:
|
|
ret = ssl3_get_client_key_exchange(s);
|
|
if (ret <= 0) {
|
|
goto end;
|
|
}
|
|
s->state = SSL3_ST_SR_CERT_VRFY_A;
|
|
s->init_num = 0;
|
|
break;
|
|
|
|
case SSL3_ST_SR_CERT_VRFY_A:
|
|
case SSL3_ST_SR_CERT_VRFY_B:
|
|
ret = ssl3_get_cert_verify(s);
|
|
if (ret <= 0) {
|
|
goto end;
|
|
}
|
|
|
|
s->state = SSL3_ST_SR_CHANGE;
|
|
s->init_num = 0;
|
|
break;
|
|
|
|
case SSL3_ST_SR_CHANGE: {
|
|
char next_proto_neg = 0;
|
|
char channel_id = 0;
|
|
next_proto_neg = s->s3->next_proto_neg_seen;
|
|
channel_id = s->s3->tlsext_channel_id_valid;
|
|
|
|
/* At this point, the next message must be entirely behind a
|
|
* ChangeCipherSpec. */
|
|
if (!ssl3_expect_change_cipher_spec(s)) {
|
|
ret = -1;
|
|
goto end;
|
|
}
|
|
if (next_proto_neg) {
|
|
s->state = SSL3_ST_SR_NEXT_PROTO_A;
|
|
} else if (channel_id) {
|
|
s->state = SSL3_ST_SR_CHANNEL_ID_A;
|
|
} else {
|
|
s->state = SSL3_ST_SR_FINISHED_A;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case SSL3_ST_SR_NEXT_PROTO_A:
|
|
case SSL3_ST_SR_NEXT_PROTO_B:
|
|
ret = ssl3_get_next_proto(s);
|
|
if (ret <= 0) {
|
|
goto end;
|
|
}
|
|
s->init_num = 0;
|
|
if (s->s3->tlsext_channel_id_valid) {
|
|
s->state = SSL3_ST_SR_CHANNEL_ID_A;
|
|
} else {
|
|
s->state = SSL3_ST_SR_FINISHED_A;
|
|
}
|
|
break;
|
|
|
|
case SSL3_ST_SR_CHANNEL_ID_A:
|
|
case SSL3_ST_SR_CHANNEL_ID_B:
|
|
ret = ssl3_get_channel_id(s);
|
|
if (ret <= 0) {
|
|
goto end;
|
|
}
|
|
s->init_num = 0;
|
|
s->state = SSL3_ST_SR_FINISHED_A;
|
|
break;
|
|
|
|
case SSL3_ST_SR_FINISHED_A:
|
|
case SSL3_ST_SR_FINISHED_B:
|
|
ret =
|
|
ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A, SSL3_ST_SR_FINISHED_B);
|
|
if (ret <= 0) {
|
|
goto end;
|
|
}
|
|
|
|
if (s->hit) {
|
|
s->state = SSL_ST_OK;
|
|
} else if (s->tlsext_ticket_expected) {
|
|
s->state = SSL3_ST_SW_SESSION_TICKET_A;
|
|
} else {
|
|
s->state = SSL3_ST_SW_CHANGE_A;
|
|
}
|
|
/* If this is a full handshake with ChannelID then record the hashshake
|
|
* hashes in |s->session| in case we need them to verify a ChannelID
|
|
* signature on a resumption of this session in the future. */
|
|
if (!s->hit && s->s3->tlsext_channel_id_new) {
|
|
ret = tls1_record_handshake_hashes_for_channel_id(s);
|
|
if (ret <= 0) {
|
|
goto end;
|
|
}
|
|
}
|
|
s->init_num = 0;
|
|
break;
|
|
|
|
case SSL3_ST_SW_SESSION_TICKET_A:
|
|
case SSL3_ST_SW_SESSION_TICKET_B:
|
|
ret = ssl3_send_new_session_ticket(s);
|
|
if (ret <= 0) {
|
|
goto end;
|
|
}
|
|
s->state = SSL3_ST_SW_CHANGE_A;
|
|
s->init_num = 0;
|
|
break;
|
|
|
|
case SSL3_ST_SW_CHANGE_A:
|
|
case SSL3_ST_SW_CHANGE_B:
|
|
s->session->cipher = s->s3->tmp.new_cipher;
|
|
if (!s->enc_method->setup_key_block(s)) {
|
|
ret = -1;
|
|
goto end;
|
|
}
|
|
|
|
ret = ssl3_send_change_cipher_spec(s, SSL3_ST_SW_CHANGE_A,
|
|
SSL3_ST_SW_CHANGE_B);
|
|
if (ret <= 0) {
|
|
goto end;
|
|
}
|
|
s->state = SSL3_ST_SW_FINISHED_A;
|
|
s->init_num = 0;
|
|
|
|
if (!s->enc_method->change_cipher_state(
|
|
s, SSL3_CHANGE_CIPHER_SERVER_WRITE)) {
|
|
ret = -1;
|
|
goto end;
|
|
}
|
|
break;
|
|
|
|
case SSL3_ST_SW_FINISHED_A:
|
|
case SSL3_ST_SW_FINISHED_B:
|
|
ret =
|
|
ssl3_send_finished(s, SSL3_ST_SW_FINISHED_A, SSL3_ST_SW_FINISHED_B,
|
|
s->enc_method->server_finished_label,
|
|
s->enc_method->server_finished_label_len);
|
|
if (ret <= 0) {
|
|
goto end;
|
|
}
|
|
s->state = SSL3_ST_SW_FLUSH;
|
|
if (s->hit) {
|
|
s->s3->tmp.next_state = SSL3_ST_SR_CHANGE;
|
|
} else {
|
|
s->s3->tmp.next_state = SSL_ST_OK;
|
|
}
|
|
s->init_num = 0;
|
|
break;
|
|
|
|
case SSL_ST_OK:
|
|
/* clean a few things up */
|
|
ssl3_cleanup_key_block(s);
|
|
|
|
BUF_MEM_free(s->init_buf);
|
|
s->init_buf = NULL;
|
|
|
|
/* remove buffering on output */
|
|
ssl_free_wbio_buffer(s);
|
|
|
|
s->init_num = 0;
|
|
|
|
/* If we aren't retaining peer certificates then we can discard it
|
|
* now. */
|
|
if (s->session->peer && s->ctx->retain_only_sha256_of_client_certs) {
|
|
X509_free(s->session->peer);
|
|
s->session->peer = NULL;
|
|
}
|
|
|
|
if (s->renegotiate == 2) {
|
|
/* skipped if we just sent a HelloRequest */
|
|
s->renegotiate = 0;
|
|
s->new_session = 0;
|
|
|
|
ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
|
|
|
|
s->ctx->stats.sess_accept_good++;
|
|
|
|
if (cb != NULL) {
|
|
cb(s, SSL_CB_HANDSHAKE_DONE, 1);
|
|
}
|
|
}
|
|
|
|
ret = 1;
|
|
goto end;
|
|
|
|
default:
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_accept, SSL_R_UNKNOWN_STATE);
|
|
ret = -1;
|
|
goto end;
|
|
}
|
|
|
|
if (!s->s3->tmp.reuse_message && !skip && cb != NULL && s->state != state) {
|
|
new_state = s->state;
|
|
s->state = state;
|
|
cb(s, SSL_CB_ACCEPT_LOOP, 1);
|
|
s->state = new_state;
|
|
}
|
|
skip = 0;
|
|
}
|
|
|
|
end:
|
|
s->in_handshake--;
|
|
if (buf != NULL) {
|
|
BUF_MEM_free(buf);
|
|
}
|
|
if (cb != NULL) {
|
|
cb(s, SSL_CB_ACCEPT_EXIT, ret);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int ssl3_read_sniff_buffer(SSL *s, size_t n) {
|
|
if (s->s3->sniff_buffer == NULL) {
|
|
s->s3->sniff_buffer = BUF_MEM_new();
|
|
}
|
|
if (s->s3->sniff_buffer == NULL || !BUF_MEM_grow(s->s3->sniff_buffer, n)) {
|
|
return -1;
|
|
}
|
|
|
|
while (s->s3->sniff_buffer_len < n) {
|
|
int ret;
|
|
|
|
s->rwstate = SSL_READING;
|
|
ret = BIO_read(s->rbio, s->s3->sniff_buffer->data + s->s3->sniff_buffer_len,
|
|
n - s->s3->sniff_buffer_len);
|
|
if (ret <= 0) {
|
|
return ret;
|
|
}
|
|
s->rwstate = SSL_NOTHING;
|
|
s->s3->sniff_buffer_len += ret;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int ssl3_get_initial_bytes(SSL *s) {
|
|
int ret;
|
|
const uint8_t *p;
|
|
|
|
/* Read the first 8 bytes. To recognize a ClientHello or V2ClientHello only
|
|
* needs the first 6 bytes, but 8 is needed to recognize CONNECT below. */
|
|
ret = ssl3_read_sniff_buffer(s, INITIAL_SNIFF_BUFFER_SIZE);
|
|
if (ret <= 0) {
|
|
return ret;
|
|
}
|
|
assert(s->s3->sniff_buffer_len >= INITIAL_SNIFF_BUFFER_SIZE);
|
|
p = (const uint8_t *)s->s3->sniff_buffer->data;
|
|
|
|
/* Some dedicated error codes for protocol mixups should the application wish
|
|
* to interpret them differently. (These do not overlap with ClientHello or
|
|
* V2ClientHello.) */
|
|
if (strncmp("GET ", (const char *)p, 4) == 0 ||
|
|
strncmp("POST ", (const char *)p, 5) == 0 ||
|
|
strncmp("HEAD ", (const char *)p, 5) == 0 ||
|
|
strncmp("PUT ", (const char *)p, 4) == 0) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_initial_bytes, SSL_R_HTTP_REQUEST);
|
|
return -1;
|
|
}
|
|
if (strncmp("CONNECT ", (const char *)p, 8) == 0) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_initial_bytes, SSL_R_HTTPS_PROXY_REQUEST);
|
|
return -1;
|
|
}
|
|
|
|
/* Determine if this is a ClientHello or V2ClientHello. */
|
|
if ((p[0] & 0x80) && p[2] == SSL2_MT_CLIENT_HELLO &&
|
|
p[3] >= SSL3_VERSION_MAJOR) {
|
|
/* This is a V2ClientHello. */
|
|
s->state = SSL3_ST_SR_V2_CLIENT_HELLO;
|
|
return 1;
|
|
}
|
|
if (p[0] == SSL3_RT_HANDSHAKE && p[1] >= SSL3_VERSION_MAJOR &&
|
|
p[5] == SSL3_MT_CLIENT_HELLO) {
|
|
/* This is a ClientHello. Initialize the record layer with the already
|
|
* consumed data and continue the handshake. */
|
|
if (!ssl3_setup_buffers(s) || !ssl_init_wbio_buffer(s, 1)) {
|
|
return -1;
|
|
}
|
|
assert(s->rstate == SSL_ST_READ_HEADER);
|
|
memcpy(s->s3->rbuf.buf, p, s->s3->sniff_buffer_len);
|
|
s->s3->rbuf.offset = 0;
|
|
s->s3->rbuf.left = s->s3->sniff_buffer_len;
|
|
s->packet_length = 0;
|
|
|
|
BUF_MEM_free(s->s3->sniff_buffer);
|
|
s->s3->sniff_buffer = NULL;
|
|
s->s3->sniff_buffer_len = 0;
|
|
|
|
s->state = SSL3_ST_SR_CLNT_HELLO_A;
|
|
return 1;
|
|
}
|
|
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_initial_bytes, SSL_R_UNKNOWN_PROTOCOL);
|
|
return -1;
|
|
}
|
|
|
|
int ssl3_get_v2_client_hello(SSL *s) {
|
|
const uint8_t *p;
|
|
int ret;
|
|
CBS v2_client_hello, cipher_specs, session_id, challenge;
|
|
size_t msg_length, rand_len, len;
|
|
uint8_t msg_type;
|
|
uint16_t version, cipher_spec_length, session_id_length, challenge_length;
|
|
CBB client_hello, hello_body, cipher_suites;
|
|
uint8_t random[SSL3_RANDOM_SIZE];
|
|
|
|
/* Read the remainder of the V2ClientHello. We have previously read 8 bytes
|
|
* in ssl3_get_initial_bytes. */
|
|
assert(s->s3->sniff_buffer_len >= INITIAL_SNIFF_BUFFER_SIZE);
|
|
p = (const uint8_t *)s->s3->sniff_buffer->data;
|
|
msg_length = ((p[0] & 0x7f) << 8) | p[1];
|
|
if (msg_length > (1024 * 4)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_v2_client_hello, SSL_R_RECORD_TOO_LARGE);
|
|
return -1;
|
|
}
|
|
if (msg_length < INITIAL_SNIFF_BUFFER_SIZE - 2) {
|
|
/* Reject lengths that are too short early. We have already read 8 bytes,
|
|
* so we should not attempt to process an (invalid) V2ClientHello which
|
|
* would be shorter than that. */
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_v2_client_hello,
|
|
SSL_R_RECORD_LENGTH_MISMATCH);
|
|
return -1;
|
|
}
|
|
|
|
ret = ssl3_read_sniff_buffer(s, msg_length + 2);
|
|
if (ret <= 0) {
|
|
return ret;
|
|
}
|
|
assert(s->s3->sniff_buffer_len == msg_length + 2);
|
|
CBS_init(&v2_client_hello, (const uint8_t *)s->s3->sniff_buffer->data + 2,
|
|
msg_length);
|
|
|
|
/* The V2ClientHello without the length is incorporated into the Finished
|
|
* hash. */
|
|
ssl3_finish_mac(s, CBS_data(&v2_client_hello), CBS_len(&v2_client_hello));
|
|
if (s->msg_callback) {
|
|
s->msg_callback(0, SSL2_VERSION, 0, CBS_data(&v2_client_hello),
|
|
CBS_len(&v2_client_hello), s, s->msg_callback_arg);
|
|
}
|
|
|
|
if (!CBS_get_u8(&v2_client_hello, &msg_type) ||
|
|
!CBS_get_u16(&v2_client_hello, &version) ||
|
|
!CBS_get_u16(&v2_client_hello, &cipher_spec_length) ||
|
|
!CBS_get_u16(&v2_client_hello, &session_id_length) ||
|
|
!CBS_get_u16(&v2_client_hello, &challenge_length) ||
|
|
!CBS_get_bytes(&v2_client_hello, &cipher_specs, cipher_spec_length) ||
|
|
!CBS_get_bytes(&v2_client_hello, &session_id, session_id_length) ||
|
|
!CBS_get_bytes(&v2_client_hello, &challenge, challenge_length) ||
|
|
CBS_len(&v2_client_hello) != 0) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_v2_client_hello, SSL_R_DECODE_ERROR);
|
|
return -1;
|
|
}
|
|
|
|
/* msg_type has already been checked. */
|
|
assert(msg_type == SSL2_MT_CLIENT_HELLO);
|
|
|
|
/* The client_random is the V2ClientHello challenge. Truncate or
|
|
* left-pad with zeros as needed. */
|
|
memset(random, 0, SSL3_RANDOM_SIZE);
|
|
rand_len = CBS_len(&challenge);
|
|
if (rand_len > SSL3_RANDOM_SIZE) {
|
|
rand_len = SSL3_RANDOM_SIZE;
|
|
}
|
|
memcpy(random + (SSL3_RANDOM_SIZE - rand_len), CBS_data(&challenge),
|
|
rand_len);
|
|
|
|
/* Write out an equivalent SSLv3 ClientHello. */
|
|
if (!CBB_init_fixed(&client_hello, (uint8_t *)s->init_buf->data,
|
|
s->init_buf->max)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_v2_client_hello, ERR_R_MALLOC_FAILURE);
|
|
return -1;
|
|
}
|
|
if (!CBB_add_u8(&client_hello, SSL3_MT_CLIENT_HELLO) ||
|
|
!CBB_add_u24_length_prefixed(&client_hello, &hello_body) ||
|
|
!CBB_add_u16(&hello_body, version) ||
|
|
!CBB_add_bytes(&hello_body, random, SSL3_RANDOM_SIZE) ||
|
|
/* No session id. */
|
|
!CBB_add_u8(&hello_body, 0) ||
|
|
!CBB_add_u16_length_prefixed(&hello_body, &cipher_suites)) {
|
|
CBB_cleanup(&client_hello);
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_v2_client_hello, ERR_R_INTERNAL_ERROR);
|
|
return -1;
|
|
}
|
|
|
|
/* Copy the cipher suites. */
|
|
while (CBS_len(&cipher_specs) > 0) {
|
|
uint32_t cipher_spec;
|
|
if (!CBS_get_u24(&cipher_specs, &cipher_spec)) {
|
|
CBB_cleanup(&client_hello);
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_v2_client_hello, SSL_R_DECODE_ERROR);
|
|
return -1;
|
|
}
|
|
|
|
/* Skip SSLv2 ciphers. */
|
|
if ((cipher_spec & 0xff0000) != 0) {
|
|
continue;
|
|
}
|
|
if (!CBB_add_u16(&cipher_suites, cipher_spec)) {
|
|
CBB_cleanup(&client_hello);
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_v2_client_hello, ERR_R_INTERNAL_ERROR);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/* Add the null compression scheme and finish. */
|
|
if (!CBB_add_u8(&hello_body, 1) || !CBB_add_u8(&hello_body, 0) ||
|
|
!CBB_finish(&client_hello, NULL, &len)) {
|
|
CBB_cleanup(&client_hello);
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_v2_client_hello, ERR_R_INTERNAL_ERROR);
|
|
return -1;
|
|
}
|
|
|
|
/* Mark the message for "re"-use by the version-specific method. */
|
|
s->s3->tmp.reuse_message = 1;
|
|
s->s3->tmp.message_type = SSL3_MT_CLIENT_HELLO;
|
|
/* The handshake message header is 4 bytes. */
|
|
s->s3->tmp.message_size = len - 4;
|
|
|
|
/* Initialize the record layer. */
|
|
if (!ssl3_setup_buffers(s) || !ssl_init_wbio_buffer(s, 1)) {
|
|
return -1;
|
|
}
|
|
|
|
/* Drop the sniff buffer. */
|
|
BUF_MEM_free(s->s3->sniff_buffer);
|
|
s->s3->sniff_buffer = NULL;
|
|
s->s3->sniff_buffer_len = 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int ssl3_send_hello_request(SSL *s) {
|
|
if (s->state == SSL3_ST_SW_HELLO_REQ_A) {
|
|
ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0);
|
|
s->state = SSL3_ST_SW_HELLO_REQ_B;
|
|
}
|
|
|
|
/* SSL3_ST_SW_HELLO_REQ_B */
|
|
return ssl_do_write(s);
|
|
}
|
|
|
|
int ssl3_get_client_hello(SSL *s) {
|
|
int i, ok, al = SSL_AD_INTERNAL_ERROR, ret = -1;
|
|
long n;
|
|
const SSL_CIPHER *c;
|
|
STACK_OF(SSL_CIPHER) *ciphers = NULL;
|
|
struct ssl_early_callback_ctx early_ctx;
|
|
CBS client_hello;
|
|
uint16_t client_version;
|
|
CBS client_random, session_id, cipher_suites, compression_methods;
|
|
|
|
/* We do this so that we will respond with our native type. If we are TLSv1
|
|
* and we get SSLv3, we will respond with TLSv1, This down switching should
|
|
* be handled by a different method. If we are SSLv3, we will respond with
|
|
* SSLv3, even if prompted with TLSv1. */
|
|
switch (s->state) {
|
|
case SSL3_ST_SR_CLNT_HELLO_A:
|
|
case SSL3_ST_SR_CLNT_HELLO_B:
|
|
n = s->method->ssl_get_message(
|
|
s, SSL3_ST_SR_CLNT_HELLO_A, SSL3_ST_SR_CLNT_HELLO_B,
|
|
SSL3_MT_CLIENT_HELLO, SSL3_RT_MAX_PLAIN_LENGTH,
|
|
SSL_GET_MESSAGE_HASH_MESSAGE, &ok);
|
|
|
|
if (!ok) {
|
|
return n;
|
|
}
|
|
|
|
/* If we require cookies and this ClientHello doesn't contain one, just
|
|
* return since we do not want to allocate any memory yet. So check
|
|
* cookie length... */
|
|
if (SSL_IS_DTLS(s) && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) {
|
|
uint8_t cookie_length;
|
|
|
|
CBS_init(&client_hello, s->init_msg, n);
|
|
if (!CBS_skip(&client_hello, 2 + SSL3_RANDOM_SIZE) ||
|
|
!CBS_get_u8_length_prefixed(&client_hello, &session_id) ||
|
|
!CBS_get_u8(&client_hello, &cookie_length)) {
|
|
al = SSL_AD_DECODE_ERROR;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_hello, SSL_R_DECODE_ERROR);
|
|
goto f_err;
|
|
}
|
|
|
|
if (cookie_length == 0) {
|
|
return 1;
|
|
}
|
|
}
|
|
s->state = SSL3_ST_SR_CLNT_HELLO_C;
|
|
/* fallthrough */
|
|
case SSL3_ST_SR_CLNT_HELLO_C:
|
|
case SSL3_ST_SR_CLNT_HELLO_D:
|
|
/* We have previously parsed the ClientHello message, and can't call
|
|
* ssl_get_message again without hashing the message into the Finished
|
|
* digest again. */
|
|
n = s->init_num;
|
|
|
|
memset(&early_ctx, 0, sizeof(early_ctx));
|
|
early_ctx.ssl = s;
|
|
early_ctx.client_hello = s->init_msg;
|
|
early_ctx.client_hello_len = n;
|
|
if (!ssl_early_callback_init(&early_ctx)) {
|
|
al = SSL_AD_DECODE_ERROR;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_hello,
|
|
SSL_R_CLIENTHELLO_PARSE_FAILED);
|
|
goto f_err;
|
|
}
|
|
|
|
if (s->state == SSL3_ST_SR_CLNT_HELLO_C &&
|
|
s->ctx->select_certificate_cb != NULL) {
|
|
s->state = SSL3_ST_SR_CLNT_HELLO_D;
|
|
switch (s->ctx->select_certificate_cb(&early_ctx)) {
|
|
case 0:
|
|
return CERTIFICATE_SELECTION_PENDING;
|
|
|
|
case -1:
|
|
/* Connection rejected. */
|
|
al = SSL_AD_ACCESS_DENIED;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_hello,
|
|
SSL_R_CONNECTION_REJECTED);
|
|
goto f_err;
|
|
|
|
default:
|
|
/* fallthrough */;
|
|
}
|
|
}
|
|
s->state = SSL3_ST_SR_CLNT_HELLO_D;
|
|
break;
|
|
|
|
default:
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_hello, SSL_R_UNKNOWN_STATE);
|
|
return -1;
|
|
}
|
|
|
|
CBS_init(&client_hello, s->init_msg, n);
|
|
if (!CBS_get_u16(&client_hello, &client_version) ||
|
|
!CBS_get_bytes(&client_hello, &client_random, SSL3_RANDOM_SIZE) ||
|
|
!CBS_get_u8_length_prefixed(&client_hello, &session_id) ||
|
|
CBS_len(&session_id) > SSL_MAX_SSL_SESSION_ID_LENGTH) {
|
|
al = SSL_AD_DECODE_ERROR;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_hello, SSL_R_DECODE_ERROR);
|
|
goto f_err;
|
|
}
|
|
|
|
/* use version from inside client hello, not from record header (may differ:
|
|
* see RFC 2246, Appendix E, second paragraph) */
|
|
s->client_version = client_version;
|
|
|
|
/* Load the client random. */
|
|
memcpy(s->s3->client_random, CBS_data(&client_random), SSL3_RANDOM_SIZE);
|
|
|
|
if (SSL_IS_DTLS(s)) {
|
|
CBS cookie;
|
|
|
|
if (!CBS_get_u8_length_prefixed(&client_hello, &cookie) ||
|
|
CBS_len(&cookie) > DTLS1_COOKIE_LENGTH) {
|
|
al = SSL_AD_DECODE_ERROR;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_hello, SSL_R_DECODE_ERROR);
|
|
goto f_err;
|
|
}
|
|
|
|
/* Verify the cookie if appropriate option is set. */
|
|
if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) && CBS_len(&cookie) > 0) {
|
|
if (s->ctx->app_verify_cookie_cb != NULL) {
|
|
if (s->ctx->app_verify_cookie_cb(s, CBS_data(&cookie),
|
|
CBS_len(&cookie)) == 0) {
|
|
al = SSL_AD_HANDSHAKE_FAILURE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_hello, SSL_R_COOKIE_MISMATCH);
|
|
goto f_err;
|
|
}
|
|
/* else cookie verification succeeded */
|
|
} else if (!CBS_mem_equal(&cookie, s->d1->cookie, s->d1->cookie_len)) {
|
|
/* default verification */
|
|
al = SSL_AD_HANDSHAKE_FAILURE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_hello, SSL_R_COOKIE_MISMATCH);
|
|
goto f_err;
|
|
}
|
|
/* Set to -2 so if successful we return 2 and don't send
|
|
* HelloVerifyRequest. */
|
|
ret = -2;
|
|
}
|
|
}
|
|
|
|
if (!s->s3->have_version) {
|
|
/* Select version to use */
|
|
uint16_t version = ssl3_get_mutual_version(s, client_version);
|
|
if (version == 0) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_hello, SSL_R_UNSUPPORTED_PROTOCOL);
|
|
s->version = s->client_version;
|
|
al = SSL_AD_PROTOCOL_VERSION;
|
|
goto f_err;
|
|
}
|
|
s->version = version;
|
|
s->enc_method = ssl3_get_enc_method(version);
|
|
assert(s->enc_method != NULL);
|
|
/* At this point, the connection's version is known and |s->version| is
|
|
* fixed. Begin enforcing the record-layer version. */
|
|
s->s3->have_version = 1;
|
|
} else if (SSL_IS_DTLS(s) ? (s->client_version > s->version)
|
|
: (s->client_version < s->version)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_hello, SSL_R_WRONG_VERSION_NUMBER);
|
|
al = SSL_AD_PROTOCOL_VERSION;
|
|
goto f_err;
|
|
}
|
|
|
|
s->hit = 0;
|
|
/* Versions before 0.9.7 always allow clients to resume sessions in
|
|
* renegotiation. 0.9.7 and later allow this by default, but optionally
|
|
* ignore resumption requests with flag
|
|
* SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather than
|
|
* a change to default behavior so that applications relying on this for
|
|
* security won't even compile against older library versions).
|
|
*
|
|
* 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to
|
|
* request renegotiation but not a new session (s->new_session remains
|
|
* unset): for servers, this essentially just means that the
|
|
* SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be ignored. */
|
|
if (s->new_session &&
|
|
(s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)) {
|
|
if (!ssl_get_new_session(s, 1)) {
|
|
goto err;
|
|
}
|
|
} else {
|
|
i = ssl_get_prev_session(s, &early_ctx);
|
|
if (i == PENDING_SESSION) {
|
|
ret = PENDING_SESSION;
|
|
goto err;
|
|
} else if (i == -1) {
|
|
goto err;
|
|
}
|
|
|
|
/* Only resume if the session's version matches the negotiated version:
|
|
* most clients do not accept a mismatch. */
|
|
if (i == 1 && s->version == s->session->ssl_version) {
|
|
s->hit = 1;
|
|
} else {
|
|
/* No session was found or it was unacceptable. */
|
|
if (!ssl_get_new_session(s, 1)) {
|
|
goto err;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!CBS_get_u16_length_prefixed(&client_hello, &cipher_suites) ||
|
|
!CBS_get_u8_length_prefixed(&client_hello, &compression_methods) ||
|
|
CBS_len(&compression_methods) == 0) {
|
|
al = SSL_AD_DECODE_ERROR;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_hello, SSL_R_DECODE_ERROR);
|
|
goto f_err;
|
|
}
|
|
|
|
/* TODO(davidben): Per spec, cipher_suites can never be empty (specified at
|
|
* the ClientHello structure level). This logic allows it to be empty if
|
|
* resuming a session. Can we always require non-empty? If a client sends
|
|
* empty cipher_suites because it's resuming a session, it could always fail
|
|
* to resume a session, so it's unlikely to actually work. */
|
|
if (CBS_len(&cipher_suites) == 0 && CBS_len(&session_id) != 0) {
|
|
/* We need a cipher if we are not resuming a session. */
|
|
al = SSL_AD_ILLEGAL_PARAMETER;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_hello, SSL_R_NO_CIPHERS_SPECIFIED);
|
|
goto f_err;
|
|
}
|
|
|
|
ciphers = ssl_bytes_to_cipher_list(s, &cipher_suites);
|
|
if (ciphers == NULL) {
|
|
goto err;
|
|
}
|
|
|
|
/* If it is a hit, check that the cipher is in the list. */
|
|
if (s->hit && CBS_len(&cipher_suites) > 0) {
|
|
size_t j;
|
|
int found_cipher = 0;
|
|
unsigned long id = s->session->cipher->id;
|
|
|
|
for (j = 0; j < sk_SSL_CIPHER_num(ciphers); j++) {
|
|
c = sk_SSL_CIPHER_value(ciphers, j);
|
|
if (c->id == id) {
|
|
found_cipher = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!found_cipher) {
|
|
/* we need to have the cipher in the cipher list if we are asked to reuse
|
|
* it */
|
|
al = SSL_AD_ILLEGAL_PARAMETER;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_hello,
|
|
SSL_R_REQUIRED_CIPHER_MISSING);
|
|
goto f_err;
|
|
}
|
|
}
|
|
|
|
/* Only null compression is supported. */
|
|
if (memchr(CBS_data(&compression_methods), 0,
|
|
CBS_len(&compression_methods)) == NULL) {
|
|
al = SSL_AD_ILLEGAL_PARAMETER;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_hello,
|
|
SSL_R_NO_COMPRESSION_SPECIFIED);
|
|
goto f_err;
|
|
}
|
|
|
|
/* TLS extensions. */
|
|
if (s->version >= SSL3_VERSION &&
|
|
!ssl_parse_clienthello_tlsext(s, &client_hello)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_hello, SSL_R_PARSE_TLSEXT);
|
|
goto err;
|
|
}
|
|
|
|
/* There should be nothing left over in the record. */
|
|
if (CBS_len(&client_hello) != 0) {
|
|
/* wrong packet length */
|
|
al = SSL_AD_DECODE_ERROR;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_hello, SSL_R_BAD_PACKET_LENGTH);
|
|
goto f_err;
|
|
}
|
|
|
|
/* Given ciphers and SSL_get_ciphers, we must pick a cipher */
|
|
if (!s->hit) {
|
|
if (ciphers == NULL) {
|
|
al = SSL_AD_ILLEGAL_PARAMETER;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_hello, SSL_R_NO_CIPHERS_PASSED);
|
|
goto f_err;
|
|
}
|
|
|
|
/* Let cert callback update server certificates if required */
|
|
if (s->cert->cert_cb) {
|
|
int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg);
|
|
if (rv == 0) {
|
|
al = SSL_AD_INTERNAL_ERROR;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_hello, SSL_R_CERT_CB_ERROR);
|
|
goto f_err;
|
|
}
|
|
if (rv < 0) {
|
|
s->rwstate = SSL_X509_LOOKUP;
|
|
goto err;
|
|
}
|
|
s->rwstate = SSL_NOTHING;
|
|
}
|
|
c = ssl3_choose_cipher(s, ciphers, ssl_get_cipher_preferences(s));
|
|
|
|
if (c == NULL) {
|
|
al = SSL_AD_HANDSHAKE_FAILURE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_hello, SSL_R_NO_SHARED_CIPHER);
|
|
goto f_err;
|
|
}
|
|
s->s3->tmp.new_cipher = c;
|
|
} else {
|
|
/* Session-id reuse */
|
|
s->s3->tmp.new_cipher = s->session->cipher;
|
|
}
|
|
|
|
if ((!SSL_USE_SIGALGS(s) || !(s->verify_mode & SSL_VERIFY_PEER)) &&
|
|
!ssl3_digest_cached_records(s, free_handshake_buffer)) {
|
|
goto f_err;
|
|
}
|
|
|
|
/* we now have the following setup;
|
|
* client_random
|
|
* cipher_list - our prefered list of ciphers
|
|
* ciphers - the clients prefered list of ciphers
|
|
* compression - basically ignored right now
|
|
* ssl version is set - sslv3
|
|
* s->session - The ssl session has been setup.
|
|
* s->hit - session reuse flag
|
|
* s->tmp.new_cipher - the new cipher to use. */
|
|
|
|
if (ret < 0) {
|
|
ret = -ret;
|
|
}
|
|
|
|
if (0) {
|
|
f_err:
|
|
ssl3_send_alert(s, SSL3_AL_FATAL, al);
|
|
}
|
|
|
|
err:
|
|
if (ciphers != NULL) {
|
|
sk_SSL_CIPHER_free(ciphers);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int ssl3_send_server_hello(SSL *s) {
|
|
uint8_t *buf;
|
|
uint8_t *p, *d;
|
|
int sl;
|
|
unsigned long l;
|
|
|
|
if (s->state == SSL3_ST_SW_SRVR_HELLO_A) {
|
|
/* We only accept ChannelIDs on connections with ECDHE in order to avoid a
|
|
* known attack while we fix ChannelID itself. */
|
|
if (s->s3->tlsext_channel_id_valid &&
|
|
(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kEECDH) == 0) {
|
|
s->s3->tlsext_channel_id_valid = 0;
|
|
}
|
|
|
|
/* If this is a resumption and the original handshake didn't support
|
|
* ChannelID then we didn't record the original handshake hashes in the
|
|
* session and so cannot resume with ChannelIDs. */
|
|
if (s->hit && s->s3->tlsext_channel_id_new &&
|
|
s->session->original_handshake_hash_len == 0) {
|
|
s->s3->tlsext_channel_id_valid = 0;
|
|
}
|
|
|
|
buf = (uint8_t *)s->init_buf->data;
|
|
/* Do the message type and length last */
|
|
d = p = ssl_handshake_start(s);
|
|
|
|
*(p++) = s->version >> 8;
|
|
*(p++) = s->version & 0xff;
|
|
|
|
/* Random stuff */
|
|
if (!ssl_fill_hello_random(s, 1, s->s3->server_random, SSL3_RANDOM_SIZE)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_hello, ERR_R_INTERNAL_ERROR);
|
|
return -1;
|
|
}
|
|
memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE);
|
|
p += SSL3_RANDOM_SIZE;
|
|
|
|
/* There are several cases for the session ID to send
|
|
* back in the server hello:
|
|
* - For session reuse from the session cache, we send back the old session
|
|
* ID.
|
|
* - If stateless session reuse (using a session ticket) is successful, we
|
|
* send back the client's "session ID" (which doesn't actually identify
|
|
* the session).
|
|
* - If it is a new session, we send back the new session ID.
|
|
* - However, if we want the new session to be single-use, we send back a
|
|
* 0-length session ID.
|
|
* s->hit is non-zero in either case of session reuse, so the following
|
|
* won't overwrite an ID that we're supposed to send back. */
|
|
if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER) && !s->hit) {
|
|
s->session->session_id_length = 0;
|
|
}
|
|
|
|
sl = s->session->session_id_length;
|
|
if (sl > (int)sizeof(s->session->session_id)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_hello, ERR_R_INTERNAL_ERROR);
|
|
return -1;
|
|
}
|
|
*(p++) = sl;
|
|
memcpy(p, s->session->session_id, sl);
|
|
p += sl;
|
|
|
|
/* put the cipher */
|
|
s2n(ssl3_get_cipher_value(s->s3->tmp.new_cipher), p);
|
|
|
|
/* put the compression method */
|
|
*(p++) = 0;
|
|
if (ssl_prepare_serverhello_tlsext(s) <= 0) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_hello, SSL_R_SERVERHELLO_TLSEXT);
|
|
return -1;
|
|
}
|
|
p = ssl_add_serverhello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH);
|
|
if (p == NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_hello, ERR_R_INTERNAL_ERROR);
|
|
return -1;
|
|
}
|
|
|
|
/* do the header */
|
|
l = (p - d);
|
|
ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l);
|
|
s->state = SSL3_ST_SW_SRVR_HELLO_B;
|
|
}
|
|
|
|
/* SSL3_ST_SW_SRVR_HELLO_B */
|
|
return ssl_do_write(s);
|
|
}
|
|
|
|
int ssl3_send_server_done(SSL *s) {
|
|
if (s->state == SSL3_ST_SW_SRVR_DONE_A) {
|
|
ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0);
|
|
s->state = SSL3_ST_SW_SRVR_DONE_B;
|
|
}
|
|
|
|
/* SSL3_ST_SW_SRVR_DONE_B */
|
|
return ssl_do_write(s);
|
|
}
|
|
|
|
int ssl3_send_server_key_exchange(SSL *s) {
|
|
DH *dh = NULL, *dhp;
|
|
EC_KEY *ecdh = NULL, *ecdhp;
|
|
uint8_t *encodedPoint = NULL;
|
|
int encodedlen = 0;
|
|
uint16_t curve_id = 0;
|
|
BN_CTX *bn_ctx = NULL;
|
|
const char *psk_identity_hint = NULL;
|
|
size_t psk_identity_hint_len = 0;
|
|
EVP_PKEY *pkey;
|
|
uint8_t *p, *d;
|
|
int al, i;
|
|
unsigned long alg_k;
|
|
unsigned long alg_a;
|
|
int n;
|
|
CERT *cert;
|
|
BIGNUM *r[4];
|
|
int nr[4], kn;
|
|
BUF_MEM *buf;
|
|
EVP_MD_CTX md_ctx;
|
|
|
|
EVP_MD_CTX_init(&md_ctx);
|
|
if (s->state == SSL3_ST_SW_KEY_EXCH_A) {
|
|
alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
|
|
alg_a = s->s3->tmp.new_cipher->algorithm_auth;
|
|
cert = s->cert;
|
|
|
|
buf = s->init_buf;
|
|
|
|
r[0] = r[1] = r[2] = r[3] = NULL;
|
|
n = 0;
|
|
if (alg_a & SSL_aPSK) {
|
|
/* size for PSK identity hint */
|
|
psk_identity_hint = s->psk_identity_hint;
|
|
if (psk_identity_hint) {
|
|
psk_identity_hint_len = strlen(psk_identity_hint);
|
|
} else {
|
|
psk_identity_hint_len = 0;
|
|
}
|
|
n += 2 + psk_identity_hint_len;
|
|
}
|
|
|
|
if (alg_k & SSL_kEDH) {
|
|
dhp = cert->dh_tmp;
|
|
if (dhp == NULL && s->cert->dh_tmp_cb != NULL) {
|
|
dhp = s->cert->dh_tmp_cb(s, 0, 1024);
|
|
}
|
|
if (dhp == NULL) {
|
|
al = SSL_AD_HANDSHAKE_FAILURE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_key_exchange,
|
|
SSL_R_MISSING_TMP_DH_KEY);
|
|
goto f_err;
|
|
}
|
|
|
|
if (s->s3->tmp.dh != NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_key_exchange,
|
|
ERR_R_INTERNAL_ERROR);
|
|
goto err;
|
|
}
|
|
|
|
dh = DHparams_dup(dhp);
|
|
if (dh == NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_key_exchange, ERR_R_DH_LIB);
|
|
goto err;
|
|
}
|
|
|
|
s->s3->tmp.dh = dh;
|
|
if (dhp->pub_key == NULL || dhp->priv_key == NULL ||
|
|
(s->options & SSL_OP_SINGLE_DH_USE)) {
|
|
if (!DH_generate_key(dh)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_key_exchange, ERR_R_DH_LIB);
|
|
goto err;
|
|
}
|
|
} else {
|
|
dh->pub_key = BN_dup(dhp->pub_key);
|
|
dh->priv_key = BN_dup(dhp->priv_key);
|
|
if (dh->pub_key == NULL || dh->priv_key == NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_key_exchange, ERR_R_DH_LIB);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
r[0] = dh->p;
|
|
r[1] = dh->g;
|
|
r[2] = dh->pub_key;
|
|
} else if (alg_k & SSL_kEECDH) {
|
|
const EC_GROUP *group;
|
|
|
|
ecdhp = cert->ecdh_tmp;
|
|
if (s->cert->ecdh_tmp_auto) {
|
|
/* Get NID of appropriate shared curve */
|
|
int nid = tls1_get_shared_curve(s);
|
|
if (nid != NID_undef) {
|
|
ecdhp = EC_KEY_new_by_curve_name(nid);
|
|
}
|
|
} else if (ecdhp == NULL && s->cert->ecdh_tmp_cb) {
|
|
ecdhp = s->cert->ecdh_tmp_cb(s, 0, 1024);
|
|
}
|
|
if (ecdhp == NULL) {
|
|
al = SSL_AD_HANDSHAKE_FAILURE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_key_exchange,
|
|
SSL_R_MISSING_TMP_ECDH_KEY);
|
|
goto f_err;
|
|
}
|
|
|
|
if (s->s3->tmp.ecdh != NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_key_exchange,
|
|
ERR_R_INTERNAL_ERROR);
|
|
goto err;
|
|
}
|
|
|
|
/* Duplicate the ECDH structure. */
|
|
if (ecdhp == NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_key_exchange, ERR_R_ECDH_LIB);
|
|
goto err;
|
|
}
|
|
|
|
if (s->cert->ecdh_tmp_auto) {
|
|
ecdh = ecdhp;
|
|
} else {
|
|
ecdh = EC_KEY_dup(ecdhp);
|
|
if (ecdh == NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_key_exchange, ERR_R_ECDH_LIB);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
s->s3->tmp.ecdh = ecdh;
|
|
if (EC_KEY_get0_public_key(ecdh) == NULL ||
|
|
EC_KEY_get0_private_key(ecdh) == NULL ||
|
|
(s->options & SSL_OP_SINGLE_ECDH_USE)) {
|
|
if (!EC_KEY_generate_key(ecdh)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_key_exchange, ERR_R_ECDH_LIB);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
group = EC_KEY_get0_group(ecdh);
|
|
if (group == NULL ||
|
|
EC_KEY_get0_public_key(ecdh) == NULL ||
|
|
EC_KEY_get0_private_key(ecdh) == NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_key_exchange, ERR_R_ECDH_LIB);
|
|
goto err;
|
|
}
|
|
|
|
/* We only support ephemeral ECDH keys over named (not generic) curves. */
|
|
if (!tls1_ec_nid2curve_id(&curve_id, EC_GROUP_get_curve_name(group))) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_key_exchange,
|
|
SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
|
|
goto err;
|
|
}
|
|
|
|
/* Encode the public key. First check the size of encoding and allocate
|
|
* memory accordingly. */
|
|
encodedlen =
|
|
EC_POINT_point2oct(group, EC_KEY_get0_public_key(ecdh),
|
|
POINT_CONVERSION_UNCOMPRESSED, NULL, 0, NULL);
|
|
|
|
encodedPoint = (uint8_t *)OPENSSL_malloc(encodedlen * sizeof(uint8_t));
|
|
bn_ctx = BN_CTX_new();
|
|
if (encodedPoint == NULL || bn_ctx == NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_key_exchange,
|
|
ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
|
|
encodedlen = EC_POINT_point2oct(group, EC_KEY_get0_public_key(ecdh),
|
|
POINT_CONVERSION_UNCOMPRESSED,
|
|
encodedPoint, encodedlen, bn_ctx);
|
|
|
|
if (encodedlen == 0) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_key_exchange, ERR_R_ECDH_LIB);
|
|
goto err;
|
|
}
|
|
|
|
BN_CTX_free(bn_ctx);
|
|
bn_ctx = NULL;
|
|
|
|
/* We only support named (not generic) curves in ECDH ephemeral key
|
|
* exchanges. In this situation, we need four additional bytes to encode
|
|
* the entire ServerECDHParams structure. */
|
|
n += 4 + encodedlen;
|
|
|
|
/* We'll generate the serverKeyExchange message explicitly so we can set
|
|
* these to NULLs */
|
|
r[0] = NULL;
|
|
r[1] = NULL;
|
|
r[2] = NULL;
|
|
r[3] = NULL;
|
|
} else if (!(alg_k & SSL_kPSK)) {
|
|
al = SSL_AD_HANDSHAKE_FAILURE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_key_exchange,
|
|
SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
|
|
goto f_err;
|
|
}
|
|
|
|
for (i = 0; i < 4 && r[i] != NULL; i++) {
|
|
nr[i] = BN_num_bytes(r[i]);
|
|
n += 2 + nr[i];
|
|
}
|
|
|
|
if (ssl_cipher_has_server_public_key(s->s3->tmp.new_cipher)) {
|
|
pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher);
|
|
if (pkey == NULL) {
|
|
al = SSL_AD_DECODE_ERROR;
|
|
goto f_err;
|
|
}
|
|
kn = EVP_PKEY_size(pkey);
|
|
} else {
|
|
pkey = NULL;
|
|
kn = 0;
|
|
}
|
|
|
|
if (!BUF_MEM_grow_clean(buf, n + SSL_HM_HEADER_LENGTH(s) + kn)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_key_exchange, ERR_LIB_BUF);
|
|
goto err;
|
|
}
|
|
d = p = ssl_handshake_start(s);
|
|
|
|
for (i = 0; i < 4 && r[i] != NULL; i++) {
|
|
s2n(nr[i], p);
|
|
BN_bn2bin(r[i], p);
|
|
p += nr[i];
|
|
}
|
|
|
|
/* Note: ECDHE PSK ciphersuites use SSL_kEECDH and SSL_aPSK. When one of
|
|
* them is used, the server key exchange record needs to have both the
|
|
* psk_identity_hint and the ServerECDHParams. */
|
|
if (alg_a & SSL_aPSK) {
|
|
/* copy PSK identity hint (if provided) */
|
|
s2n(psk_identity_hint_len, p);
|
|
if (psk_identity_hint_len > 0) {
|
|
memcpy(p, psk_identity_hint, psk_identity_hint_len);
|
|
p += psk_identity_hint_len;
|
|
}
|
|
}
|
|
|
|
if (alg_k & SSL_kEECDH) {
|
|
/* We only support named (not generic) curves. In this situation, the
|
|
* serverKeyExchange message has:
|
|
* [1 byte CurveType], [2 byte CurveName]
|
|
* [1 byte length of encoded point], followed by
|
|
* the actual encoded point itself. */
|
|
*(p++) = NAMED_CURVE_TYPE;
|
|
*(p++) = (uint8_t)(curve_id >> 8);
|
|
*(p++) = (uint8_t)(curve_id & 0xff);
|
|
*(p++) = encodedlen;
|
|
memcpy(p, encodedPoint, encodedlen);
|
|
p += encodedlen;
|
|
OPENSSL_free(encodedPoint);
|
|
encodedPoint = NULL;
|
|
}
|
|
|
|
/* not anonymous */
|
|
if (pkey != NULL) {
|
|
/* n is the length of the params, they start at &(d[4]) and p points to
|
|
* the space at the end. */
|
|
const EVP_MD *md;
|
|
size_t sig_len = EVP_PKEY_size(pkey);
|
|
|
|
/* Determine signature algorithm. */
|
|
if (SSL_USE_SIGALGS(s)) {
|
|
md = tls1_choose_signing_digest(s, pkey);
|
|
if (!tls12_get_sigandhash(p, pkey, md)) {
|
|
/* Should never happen */
|
|
al = SSL_AD_INTERNAL_ERROR;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_key_exchange,
|
|
ERR_R_INTERNAL_ERROR);
|
|
goto f_err;
|
|
}
|
|
p += 2;
|
|
} else if (pkey->type == EVP_PKEY_RSA) {
|
|
md = EVP_md5_sha1();
|
|
} else {
|
|
md = EVP_sha1();
|
|
}
|
|
|
|
if (!EVP_DigestSignInit(&md_ctx, NULL, md, NULL, pkey) ||
|
|
!EVP_DigestSignUpdate(&md_ctx, s->s3->client_random,
|
|
SSL3_RANDOM_SIZE) ||
|
|
!EVP_DigestSignUpdate(&md_ctx, s->s3->server_random,
|
|
SSL3_RANDOM_SIZE) ||
|
|
!EVP_DigestSignUpdate(&md_ctx, d, n) ||
|
|
!EVP_DigestSignFinal(&md_ctx, &p[2], &sig_len)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_key_exchange, ERR_LIB_EVP);
|
|
goto err;
|
|
}
|
|
|
|
s2n(sig_len, p);
|
|
n += sig_len + 2;
|
|
if (SSL_USE_SIGALGS(s)) {
|
|
n += 2;
|
|
}
|
|
}
|
|
|
|
ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n);
|
|
}
|
|
|
|
s->state = SSL3_ST_SW_KEY_EXCH_B;
|
|
EVP_MD_CTX_cleanup(&md_ctx);
|
|
return ssl_do_write(s);
|
|
|
|
f_err:
|
|
ssl3_send_alert(s, SSL3_AL_FATAL, al);
|
|
err:
|
|
if (encodedPoint != NULL) {
|
|
OPENSSL_free(encodedPoint);
|
|
}
|
|
BN_CTX_free(bn_ctx);
|
|
EVP_MD_CTX_cleanup(&md_ctx);
|
|
return -1;
|
|
}
|
|
|
|
int ssl3_send_certificate_request(SSL *s) {
|
|
uint8_t *p, *d;
|
|
size_t i;
|
|
int j, nl, off, n;
|
|
STACK_OF(X509_NAME) *sk = NULL;
|
|
X509_NAME *name;
|
|
BUF_MEM *buf;
|
|
|
|
if (s->state == SSL3_ST_SW_CERT_REQ_A) {
|
|
buf = s->init_buf;
|
|
|
|
d = p = ssl_handshake_start(s);
|
|
|
|
/* get the list of acceptable cert types */
|
|
p++;
|
|
n = ssl3_get_req_cert_type(s, p);
|
|
d[0] = n;
|
|
p += n;
|
|
n++;
|
|
|
|
if (SSL_USE_SIGALGS(s)) {
|
|
const uint8_t *psigs;
|
|
nl = tls12_get_psigalgs(s, &psigs);
|
|
s2n(nl, p);
|
|
memcpy(p, psigs, nl);
|
|
p += nl;
|
|
n += nl + 2;
|
|
}
|
|
|
|
off = n;
|
|
p += 2;
|
|
n += 2;
|
|
|
|
sk = SSL_get_client_CA_list(s);
|
|
nl = 0;
|
|
if (sk != NULL) {
|
|
for (i = 0; i < sk_X509_NAME_num(sk); i++) {
|
|
name = sk_X509_NAME_value(sk, i);
|
|
j = i2d_X509_NAME(name, NULL);
|
|
if (!BUF_MEM_grow_clean(buf, SSL_HM_HEADER_LENGTH(s) + n + j + 2)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_certificate_request, ERR_R_BUF_LIB);
|
|
goto err;
|
|
}
|
|
p = ssl_handshake_start(s) + n;
|
|
s2n(j, p);
|
|
i2d_X509_NAME(name, &p);
|
|
n += 2 + j;
|
|
nl += 2 + j;
|
|
}
|
|
}
|
|
|
|
/* else no CA names */
|
|
p = ssl_handshake_start(s) + off;
|
|
s2n(nl, p);
|
|
|
|
ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n);
|
|
|
|
#ifdef NETSCAPE_HANG_BUG
|
|
if (!SSL_IS_DTLS(s)) {
|
|
/* Prepare a ServerHelloDone in the same record. This is to workaround a
|
|
* hang in Netscape. */
|
|
if (!BUF_MEM_grow_clean(buf, s->init_num + 4)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_certificate_request, ERR_R_BUF_LIB);
|
|
goto err;
|
|
}
|
|
p = (uint8_t *)s->init_buf->data + s->init_num;
|
|
/* do the header */
|
|
*(p++) = SSL3_MT_SERVER_DONE;
|
|
*(p++) = 0;
|
|
*(p++) = 0;
|
|
*(p++) = 0;
|
|
s->init_num += 4;
|
|
ssl3_finish_mac(s, p - 4, 4);
|
|
}
|
|
#endif
|
|
|
|
s->state = SSL3_ST_SW_CERT_REQ_B;
|
|
}
|
|
|
|
/* SSL3_ST_SW_CERT_REQ_B */
|
|
return ssl_do_write(s);
|
|
|
|
err:
|
|
return -1;
|
|
}
|
|
|
|
int ssl3_get_client_key_exchange(SSL *s) {
|
|
int al, ok;
|
|
long n;
|
|
CBS client_key_exchange;
|
|
unsigned long alg_k;
|
|
unsigned long alg_a;
|
|
uint8_t *premaster_secret = NULL;
|
|
size_t premaster_secret_len = 0;
|
|
RSA *rsa = NULL;
|
|
uint8_t *decrypt_buf = NULL;
|
|
EVP_PKEY *pkey = NULL;
|
|
BIGNUM *pub = NULL;
|
|
DH *dh_srvr;
|
|
|
|
EC_KEY *srvr_ecdh = NULL;
|
|
EVP_PKEY *clnt_pub_pkey = NULL;
|
|
EC_POINT *clnt_ecpoint = NULL;
|
|
BN_CTX *bn_ctx = NULL;
|
|
unsigned int psk_len = 0;
|
|
uint8_t psk[PSK_MAX_PSK_LEN];
|
|
|
|
n = s->method->ssl_get_message(s, SSL3_ST_SR_KEY_EXCH_A,
|
|
SSL3_ST_SR_KEY_EXCH_B,
|
|
SSL3_MT_CLIENT_KEY_EXCHANGE, 2048, /* ??? */
|
|
SSL_GET_MESSAGE_HASH_MESSAGE, &ok);
|
|
|
|
if (!ok) {
|
|
return n;
|
|
}
|
|
|
|
CBS_init(&client_key_exchange, s->init_msg, n);
|
|
|
|
alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
|
|
alg_a = s->s3->tmp.new_cipher->algorithm_auth;
|
|
|
|
/* If using a PSK key exchange, prepare the pre-shared key. */
|
|
if (alg_a & SSL_aPSK) {
|
|
CBS psk_identity;
|
|
|
|
/* If using PSK, the ClientKeyExchange contains a psk_identity. If PSK,
|
|
* then this is the only field in the message. */
|
|
if (!CBS_get_u16_length_prefixed(&client_key_exchange, &psk_identity) ||
|
|
((alg_k & SSL_kPSK) && CBS_len(&client_key_exchange) != 0)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange, SSL_R_DECODE_ERROR);
|
|
al = SSL_AD_DECODE_ERROR;
|
|
goto f_err;
|
|
}
|
|
|
|
if (s->psk_server_callback == NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
SSL_R_PSK_NO_SERVER_CB);
|
|
al = SSL_AD_INTERNAL_ERROR;
|
|
goto f_err;
|
|
}
|
|
|
|
if (CBS_len(&psk_identity) > PSK_MAX_IDENTITY_LEN ||
|
|
CBS_contains_zero_byte(&psk_identity)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
SSL_R_DATA_LENGTH_TOO_LONG);
|
|
al = SSL_AD_ILLEGAL_PARAMETER;
|
|
goto f_err;
|
|
}
|
|
|
|
if (!CBS_strdup(&psk_identity, &s->session->psk_identity)) {
|
|
al = SSL_AD_INTERNAL_ERROR;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
ERR_R_MALLOC_FAILURE);
|
|
goto f_err;
|
|
}
|
|
|
|
/* Look up the key for the identity. */
|
|
psk_len =
|
|
s->psk_server_callback(s, s->session->psk_identity, psk, sizeof(psk));
|
|
if (psk_len > PSK_MAX_PSK_LEN) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
ERR_R_INTERNAL_ERROR);
|
|
al = SSL_AD_INTERNAL_ERROR;
|
|
goto f_err;
|
|
} else if (psk_len == 0) {
|
|
/* PSK related to the given identity not found */
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
SSL_R_PSK_IDENTITY_NOT_FOUND);
|
|
al = SSL_AD_UNKNOWN_PSK_IDENTITY;
|
|
goto f_err;
|
|
}
|
|
}
|
|
|
|
/* Depending on the key exchange method, compute |premaster_secret| and
|
|
* |premaster_secret_len|. */
|
|
if (alg_k & SSL_kRSA) {
|
|
CBS encrypted_premaster_secret;
|
|
uint8_t rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
|
|
uint8_t good;
|
|
size_t rsa_size, decrypt_len, premaster_index, j;
|
|
|
|
pkey = s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
|
|
if (pkey == NULL || pkey->type != EVP_PKEY_RSA || pkey->pkey.rsa == NULL) {
|
|
al = SSL_AD_HANDSHAKE_FAILURE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
SSL_R_MISSING_RSA_CERTIFICATE);
|
|
goto f_err;
|
|
}
|
|
rsa = pkey->pkey.rsa;
|
|
|
|
/* TLS and [incidentally] DTLS{0xFEFF} */
|
|
if (s->version > SSL3_VERSION) {
|
|
CBS copy = client_key_exchange;
|
|
if (!CBS_get_u16_length_prefixed(&client_key_exchange,
|
|
&encrypted_premaster_secret) ||
|
|
CBS_len(&client_key_exchange) != 0) {
|
|
if (!(s->options & SSL_OP_TLS_D5_BUG)) {
|
|
al = SSL_AD_DECODE_ERROR;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
|
|
goto f_err;
|
|
} else {
|
|
encrypted_premaster_secret = copy;
|
|
}
|
|
}
|
|
} else {
|
|
encrypted_premaster_secret = client_key_exchange;
|
|
}
|
|
|
|
/* Reject overly short RSA keys because we want to be sure that the buffer
|
|
* size makes it safe to iterate over the entire size of a premaster secret
|
|
* (SSL_MAX_MASTER_KEY_LENGTH). The actual expected size is larger due to
|
|
* RSA padding, but the bound is sufficient to be safe. */
|
|
rsa_size = RSA_size(rsa);
|
|
if (rsa_size < SSL_MAX_MASTER_KEY_LENGTH) {
|
|
al = SSL_AD_DECRYPT_ERROR;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
SSL_R_DECRYPTION_FAILED);
|
|
goto f_err;
|
|
}
|
|
|
|
/* We must not leak whether a decryption failure occurs because of
|
|
* Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246,
|
|
* section 7.4.7.1). The code follows that advice of the TLS RFC and
|
|
* generates a random premaster secret for the case that the decrypt fails.
|
|
* See https://tools.ietf.org/html/rfc5246#section-7.4.7.1 */
|
|
if (!RAND_bytes(rand_premaster_secret, sizeof(rand_premaster_secret))) {
|
|
goto err;
|
|
}
|
|
|
|
/* Allocate a buffer large enough for an RSA decryption. */
|
|
decrypt_buf = OPENSSL_malloc(rsa_size);
|
|
if (decrypt_buf == NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
|
|
/* Decrypt with no padding. PKCS#1 padding will be removed as part of the
|
|
* timing-sensitive code below. */
|
|
if (!RSA_decrypt(rsa, &decrypt_len, decrypt_buf, rsa_size,
|
|
CBS_data(&encrypted_premaster_secret),
|
|
CBS_len(&encrypted_premaster_secret), RSA_NO_PADDING)) {
|
|
goto err;
|
|
}
|
|
if (decrypt_len != rsa_size) {
|
|
/* This should never happen, but do a check so we do not read
|
|
* uninitialized memory. */
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
ERR_R_INTERNAL_ERROR);
|
|
goto err;
|
|
}
|
|
|
|
/* Remove the PKCS#1 padding and adjust |decrypt_len| as appropriate.
|
|
* |good| will be 0xff if the premaster is acceptable and zero otherwise.
|
|
* */
|
|
good =
|
|
constant_time_eq_int_8(RSA_message_index_PKCS1_type_2(
|
|
decrypt_buf, decrypt_len, &premaster_index),
|
|
1);
|
|
decrypt_len = decrypt_len - premaster_index;
|
|
|
|
/* decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH. */
|
|
good &= constant_time_eq_8(decrypt_len, SSL_MAX_MASTER_KEY_LENGTH);
|
|
|
|
/* Copy over the unpadded premaster. Whatever the value of
|
|
* |decrypt_good_mask|, copy as if the premaster were the right length. It
|
|
* is important the memory access pattern be constant. */
|
|
premaster_secret =
|
|
BUF_memdup(decrypt_buf + (rsa_size - SSL_MAX_MASTER_KEY_LENGTH),
|
|
SSL_MAX_MASTER_KEY_LENGTH);
|
|
if (premaster_secret == NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
OPENSSL_free(decrypt_buf);
|
|
decrypt_buf = NULL;
|
|
|
|
/* If the version in the decrypted pre-master secret is correct then
|
|
* version_good will be 0xff, otherwise it'll be zero. The
|
|
* Klima-Pokorny-Rosa extension of Bleichenbacher's attack
|
|
* (http://eprint.iacr.org/2003/052/) exploits the version number check as
|
|
* a "bad version oracle". Thus version checks are done in constant time
|
|
* and are treated like any other decryption error. */
|
|
good &= constant_time_eq_8(premaster_secret[0],
|
|
(unsigned)(s->client_version >> 8));
|
|
good &= constant_time_eq_8(premaster_secret[1],
|
|
(unsigned)(s->client_version & 0xff));
|
|
|
|
/* Now copy rand_premaster_secret over premaster_secret using
|
|
* decrypt_good_mask. */
|
|
for (j = 0; j < sizeof(rand_premaster_secret); j++) {
|
|
premaster_secret[j] = constant_time_select_8(good, premaster_secret[j],
|
|
rand_premaster_secret[j]);
|
|
}
|
|
|
|
premaster_secret_len = sizeof(rand_premaster_secret);
|
|
} else if (alg_k & SSL_kEDH) {
|
|
CBS dh_Yc;
|
|
int dh_len;
|
|
|
|
if (!CBS_get_u16_length_prefixed(&client_key_exchange, &dh_Yc) ||
|
|
CBS_len(&dh_Yc) == 0 || CBS_len(&client_key_exchange) != 0) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
|
|
al = SSL_R_DECODE_ERROR;
|
|
goto f_err;
|
|
}
|
|
|
|
if (s->s3->tmp.dh == NULL) {
|
|
al = SSL_AD_HANDSHAKE_FAILURE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
SSL_R_MISSING_TMP_DH_KEY);
|
|
goto f_err;
|
|
}
|
|
dh_srvr = s->s3->tmp.dh;
|
|
|
|
pub = BN_bin2bn(CBS_data(&dh_Yc), CBS_len(&dh_Yc), NULL);
|
|
if (pub == NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange, SSL_R_BN_LIB);
|
|
goto err;
|
|
}
|
|
|
|
/* Allocate a buffer for the premaster secret. */
|
|
premaster_secret = OPENSSL_malloc(DH_size(dh_srvr));
|
|
if (premaster_secret == NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
|
|
dh_len = DH_compute_key(premaster_secret, pub, dh_srvr);
|
|
if (dh_len <= 0) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange, ERR_R_DH_LIB);
|
|
BN_clear_free(pub);
|
|
goto err;
|
|
}
|
|
|
|
DH_free(s->s3->tmp.dh);
|
|
s->s3->tmp.dh = NULL;
|
|
BN_clear_free(pub);
|
|
pub = NULL;
|
|
|
|
premaster_secret_len = dh_len;
|
|
} else if (alg_k & SSL_kEECDH) {
|
|
int field_size = 0, ecdh_len;
|
|
const EC_KEY *tkey;
|
|
const EC_GROUP *group;
|
|
const BIGNUM *priv_key;
|
|
CBS ecdh_Yc;
|
|
|
|
/* initialize structures for server's ECDH key pair */
|
|
srvr_ecdh = EC_KEY_new();
|
|
if (srvr_ecdh == NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
|
|
/* Use the ephermeral values we saved when generating the ServerKeyExchange
|
|
* msg. */
|
|
tkey = s->s3->tmp.ecdh;
|
|
|
|
group = EC_KEY_get0_group(tkey);
|
|
priv_key = EC_KEY_get0_private_key(tkey);
|
|
|
|
if (!EC_KEY_set_group(srvr_ecdh, group) ||
|
|
!EC_KEY_set_private_key(srvr_ecdh, priv_key)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange, ERR_R_EC_LIB);
|
|
goto err;
|
|
}
|
|
|
|
/* Let's get client's public key */
|
|
clnt_ecpoint = EC_POINT_new(group);
|
|
if (clnt_ecpoint == NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
|
|
/* Get client's public key from encoded point in the ClientKeyExchange
|
|
* message. */
|
|
if (!CBS_get_u8_length_prefixed(&client_key_exchange, &ecdh_Yc) ||
|
|
CBS_len(&client_key_exchange) != 0) {
|
|
al = SSL_AD_DECODE_ERROR;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange, SSL_R_DECODE_ERROR);
|
|
goto f_err;
|
|
}
|
|
|
|
bn_ctx = BN_CTX_new();
|
|
if (bn_ctx == NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
|
|
if (!EC_POINT_oct2point(group, clnt_ecpoint, CBS_data(&ecdh_Yc),
|
|
CBS_len(&ecdh_Yc), bn_ctx)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange, ERR_R_EC_LIB);
|
|
goto err;
|
|
}
|
|
|
|
/* Allocate a buffer for both the secret and the PSK. */
|
|
field_size = EC_GROUP_get_degree(group);
|
|
if (field_size <= 0) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange, ERR_R_ECDH_LIB);
|
|
goto err;
|
|
}
|
|
|
|
ecdh_len = (field_size + 7) / 8;
|
|
premaster_secret = OPENSSL_malloc(ecdh_len);
|
|
if (premaster_secret == NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
|
|
/* Compute the shared pre-master secret */
|
|
ecdh_len = ECDH_compute_key(premaster_secret, ecdh_len, clnt_ecpoint,
|
|
srvr_ecdh, NULL);
|
|
if (ecdh_len <= 0) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange, ERR_R_ECDH_LIB);
|
|
goto err;
|
|
}
|
|
|
|
EVP_PKEY_free(clnt_pub_pkey);
|
|
clnt_pub_pkey = NULL;
|
|
EC_POINT_free(clnt_ecpoint);
|
|
clnt_ecpoint = NULL;
|
|
EC_KEY_free(srvr_ecdh);
|
|
srvr_ecdh = NULL;
|
|
BN_CTX_free(bn_ctx);
|
|
bn_ctx = NULL;
|
|
EC_KEY_free(s->s3->tmp.ecdh);
|
|
s->s3->tmp.ecdh = NULL;
|
|
|
|
premaster_secret_len = ecdh_len;
|
|
} else if (alg_k & SSL_kPSK) {
|
|
/* For plain PSK, other_secret is a block of 0s with the same length as the
|
|
* pre-shared key. */
|
|
premaster_secret_len = psk_len;
|
|
premaster_secret = OPENSSL_malloc(premaster_secret_len);
|
|
if (premaster_secret == NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
memset(premaster_secret, 0, premaster_secret_len);
|
|
} else {
|
|
al = SSL_AD_HANDSHAKE_FAILURE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
SSL_R_UNKNOWN_CIPHER_TYPE);
|
|
goto f_err;
|
|
}
|
|
|
|
/* For a PSK cipher suite, the actual pre-master secret is combined with the
|
|
* pre-shared key. */
|
|
if (alg_a & SSL_aPSK) {
|
|
CBB new_premaster, child;
|
|
uint8_t *new_data;
|
|
size_t new_len;
|
|
|
|
if (!CBB_init(&new_premaster, 2 + psk_len + 2 + premaster_secret_len)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
if (!CBB_add_u16_length_prefixed(&new_premaster, &child) ||
|
|
!CBB_add_bytes(&child, premaster_secret, premaster_secret_len) ||
|
|
!CBB_add_u16_length_prefixed(&new_premaster, &child) ||
|
|
!CBB_add_bytes(&child, psk, psk_len) ||
|
|
!CBB_finish(&new_premaster, &new_data, &new_len)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_key_exchange,
|
|
ERR_R_INTERNAL_ERROR);
|
|
CBB_cleanup(&new_premaster);
|
|
goto err;
|
|
}
|
|
|
|
OPENSSL_cleanse(premaster_secret, premaster_secret_len);
|
|
OPENSSL_free(premaster_secret);
|
|
premaster_secret = new_data;
|
|
premaster_secret_len = new_len;
|
|
}
|
|
|
|
/* Compute the master secret */
|
|
s->session->master_key_length = s->enc_method->generate_master_secret(
|
|
s, s->session->master_key, premaster_secret, premaster_secret_len);
|
|
if (s->session->master_key_length == 0) {
|
|
goto err;
|
|
}
|
|
s->session->extended_master_secret = s->s3->tmp.extended_master_secret;
|
|
|
|
OPENSSL_cleanse(premaster_secret, premaster_secret_len);
|
|
OPENSSL_free(premaster_secret);
|
|
return 1;
|
|
|
|
f_err:
|
|
ssl3_send_alert(s, SSL3_AL_FATAL, al);
|
|
err:
|
|
if (premaster_secret) {
|
|
if (premaster_secret_len) {
|
|
OPENSSL_cleanse(premaster_secret, premaster_secret_len);
|
|
}
|
|
OPENSSL_free(premaster_secret);
|
|
}
|
|
if (decrypt_buf) {
|
|
OPENSSL_free(decrypt_buf);
|
|
}
|
|
EVP_PKEY_free(clnt_pub_pkey);
|
|
EC_POINT_free(clnt_ecpoint);
|
|
if (srvr_ecdh != NULL) {
|
|
EC_KEY_free(srvr_ecdh);
|
|
}
|
|
BN_CTX_free(bn_ctx);
|
|
|
|
return -1;
|
|
}
|
|
|
|
int ssl3_get_cert_verify(SSL *s) {
|
|
int al, ok, ret = 0;
|
|
long n;
|
|
CBS certificate_verify, signature;
|
|
X509 *peer = s->session->peer;
|
|
EVP_PKEY *pkey = NULL;
|
|
const EVP_MD *md = NULL;
|
|
uint8_t digest[EVP_MAX_MD_SIZE];
|
|
size_t digest_length;
|
|
EVP_PKEY_CTX *pctx = NULL;
|
|
|
|
/* Only RSA and ECDSA client certificates are supported, so a
|
|
* CertificateVerify is required if and only if there's a client certificate.
|
|
* */
|
|
if (peer == NULL) {
|
|
if (s->s3->handshake_buffer &&
|
|
!ssl3_digest_cached_records(s, free_handshake_buffer)) {
|
|
return -1;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
n = s->method->ssl_get_message(
|
|
s, SSL3_ST_SR_CERT_VRFY_A, SSL3_ST_SR_CERT_VRFY_B,
|
|
SSL3_MT_CERTIFICATE_VERIFY, SSL3_RT_MAX_PLAIN_LENGTH,
|
|
SSL_GET_MESSAGE_DONT_HASH_MESSAGE, &ok);
|
|
|
|
if (!ok) {
|
|
return n;
|
|
}
|
|
|
|
/* Filter out unsupported certificate types. */
|
|
pkey = X509_get_pubkey(peer);
|
|
if (!(X509_certificate_type(peer, pkey) & EVP_PKT_SIGN) ||
|
|
(pkey->type != EVP_PKEY_RSA && pkey->type != EVP_PKEY_EC)) {
|
|
al = SSL_AD_UNSUPPORTED_CERTIFICATE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_cert_verify,
|
|
SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE);
|
|
goto f_err;
|
|
}
|
|
|
|
CBS_init(&certificate_verify, s->init_msg, n);
|
|
|
|
/* Determine the digest type if needbe. */
|
|
if (SSL_USE_SIGALGS(s) &&
|
|
!tls12_check_peer_sigalg(&md, &al, s, &certificate_verify, pkey)) {
|
|
goto f_err;
|
|
}
|
|
|
|
/* Compute the digest. */
|
|
if (!ssl3_cert_verify_hash(s, digest, &digest_length, &md, pkey)) {
|
|
goto err;
|
|
}
|
|
|
|
/* The handshake buffer is no longer necessary, and we may hash the current
|
|
* message.*/
|
|
if (s->s3->handshake_buffer &&
|
|
!ssl3_digest_cached_records(s, free_handshake_buffer)) {
|
|
goto err;
|
|
}
|
|
ssl3_hash_current_message(s);
|
|
|
|
/* Parse and verify the signature. */
|
|
if (!CBS_get_u16_length_prefixed(&certificate_verify, &signature) ||
|
|
CBS_len(&certificate_verify) != 0) {
|
|
al = SSL_AD_DECODE_ERROR;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_cert_verify, SSL_R_DECODE_ERROR);
|
|
goto f_err;
|
|
}
|
|
|
|
pctx = EVP_PKEY_CTX_new(pkey, NULL);
|
|
if (pctx == NULL) {
|
|
goto err;
|
|
}
|
|
if (!EVP_PKEY_verify_init(pctx) ||
|
|
!EVP_PKEY_CTX_set_signature_md(pctx, md) ||
|
|
!EVP_PKEY_verify(pctx, CBS_data(&signature), CBS_len(&signature), digest,
|
|
digest_length)) {
|
|
al = SSL_AD_DECRYPT_ERROR;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_cert_verify, SSL_R_BAD_SIGNATURE);
|
|
goto f_err;
|
|
}
|
|
|
|
ret = 1;
|
|
|
|
if (0) {
|
|
f_err:
|
|
ssl3_send_alert(s, SSL3_AL_FATAL, al);
|
|
}
|
|
|
|
err:
|
|
EVP_PKEY_CTX_free(pctx);
|
|
EVP_PKEY_free(pkey);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ssl3_get_client_certificate(SSL *s) {
|
|
int i, ok, al, ret = -1;
|
|
X509 *x = NULL;
|
|
unsigned long n;
|
|
STACK_OF(X509) *sk = NULL;
|
|
SHA256_CTX sha256;
|
|
CBS certificate_msg, certificate_list;
|
|
int is_first_certificate = 1;
|
|
|
|
n = s->method->ssl_get_message(s, SSL3_ST_SR_CERT_A, SSL3_ST_SR_CERT_B, -1,
|
|
s->max_cert_list, SSL_GET_MESSAGE_HASH_MESSAGE,
|
|
&ok);
|
|
|
|
if (!ok) {
|
|
return n;
|
|
}
|
|
|
|
if (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) {
|
|
if ((s->verify_mode & SSL_VERIFY_PEER) &&
|
|
(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_certificate,
|
|
SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
|
|
al = SSL_AD_HANDSHAKE_FAILURE;
|
|
goto f_err;
|
|
}
|
|
|
|
/* If tls asked for a client cert, the client must return a 0 list */
|
|
if (s->version > SSL3_VERSION && s->s3->tmp.cert_request) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_certificate,
|
|
SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
|
|
al = SSL_AD_UNEXPECTED_MESSAGE;
|
|
goto f_err;
|
|
}
|
|
s->s3->tmp.reuse_message = 1;
|
|
|
|
return 1;
|
|
}
|
|
|
|
if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE) {
|
|
al = SSL_AD_UNEXPECTED_MESSAGE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_certificate,
|
|
SSL_R_WRONG_MESSAGE_TYPE);
|
|
goto f_err;
|
|
}
|
|
|
|
CBS_init(&certificate_msg, s->init_msg, n);
|
|
|
|
sk = sk_X509_new_null();
|
|
if (sk == NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_certificate, ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
|
|
if (!CBS_get_u24_length_prefixed(&certificate_msg, &certificate_list) ||
|
|
CBS_len(&certificate_msg) != 0) {
|
|
al = SSL_AD_DECODE_ERROR;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_certificate, SSL_R_DECODE_ERROR);
|
|
goto f_err;
|
|
}
|
|
|
|
while (CBS_len(&certificate_list) > 0) {
|
|
CBS certificate;
|
|
const uint8_t *data;
|
|
|
|
if (!CBS_get_u24_length_prefixed(&certificate_list, &certificate)) {
|
|
al = SSL_AD_DECODE_ERROR;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_certificate, SSL_R_DECODE_ERROR);
|
|
goto f_err;
|
|
}
|
|
|
|
if (is_first_certificate && s->ctx->retain_only_sha256_of_client_certs) {
|
|
/* If this is the first certificate, and we don't want to keep peer
|
|
* certificates in memory, then we hash it right away. */
|
|
SHA256_Init(&sha256);
|
|
SHA256_Update(&sha256, CBS_data(&certificate), CBS_len(&certificate));
|
|
SHA256_Final(s->session->peer_sha256, &sha256);
|
|
s->session->peer_sha256_valid = 1;
|
|
}
|
|
is_first_certificate = 0;
|
|
|
|
data = CBS_data(&certificate);
|
|
x = d2i_X509(NULL, &data, CBS_len(&certificate));
|
|
if (x == NULL) {
|
|
al = SSL_AD_BAD_CERTIFICATE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_certificate, ERR_R_ASN1_LIB);
|
|
goto f_err;
|
|
}
|
|
if (data != CBS_data(&certificate) + CBS_len(&certificate)) {
|
|
al = SSL_AD_DECODE_ERROR;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_certificate,
|
|
SSL_R_CERT_LENGTH_MISMATCH);
|
|
goto f_err;
|
|
}
|
|
if (!sk_X509_push(sk, x)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_certificate, ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
x = NULL;
|
|
}
|
|
|
|
if (sk_X509_num(sk) <= 0) {
|
|
/* TLS does not mind 0 certs returned */
|
|
if (s->version == SSL3_VERSION) {
|
|
al = SSL_AD_HANDSHAKE_FAILURE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_certificate,
|
|
SSL_R_NO_CERTIFICATES_RETURNED);
|
|
goto f_err;
|
|
}
|
|
/* Fail for TLS only if we required a certificate */
|
|
else if ((s->verify_mode & SSL_VERIFY_PEER) &&
|
|
(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_certificate,
|
|
SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
|
|
al = SSL_AD_HANDSHAKE_FAILURE;
|
|
goto f_err;
|
|
}
|
|
/* No client certificate so digest cached records */
|
|
if (s->s3->handshake_buffer &&
|
|
!ssl3_digest_cached_records(s, free_handshake_buffer)) {
|
|
al = SSL_AD_INTERNAL_ERROR;
|
|
goto f_err;
|
|
}
|
|
} else {
|
|
i = ssl_verify_cert_chain(s, sk);
|
|
if (i <= 0) {
|
|
al = ssl_verify_alarm_type(s->verify_result);
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_certificate,
|
|
SSL_R_CERTIFICATE_VERIFY_FAILED);
|
|
goto f_err;
|
|
}
|
|
}
|
|
|
|
if (s->session->peer != NULL) {
|
|
/* This should not be needed */
|
|
X509_free(s->session->peer);
|
|
}
|
|
|
|
s->session->peer = sk_X509_shift(sk);
|
|
s->session->verify_result = s->verify_result;
|
|
|
|
/* With the current implementation, sess_cert will always be NULL when we
|
|
* arrive here. */
|
|
if (s->session->sess_cert == NULL) {
|
|
s->session->sess_cert = ssl_sess_cert_new();
|
|
if (s->session->sess_cert == NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_client_certificate, ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
}
|
|
if (s->session->sess_cert->cert_chain != NULL) {
|
|
sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
|
|
}
|
|
s->session->sess_cert->cert_chain = sk;
|
|
/* Inconsistency alert: cert_chain does *not* include the peer's own
|
|
* certificate, while we do include it in s3_clnt.c */
|
|
|
|
sk = NULL;
|
|
|
|
ret = 1;
|
|
|
|
if (0) {
|
|
f_err:
|
|
ssl3_send_alert(s, SSL3_AL_FATAL, al);
|
|
}
|
|
|
|
err:
|
|
if (x != NULL) {
|
|
X509_free(x);
|
|
}
|
|
if (sk != NULL) {
|
|
sk_X509_pop_free(sk, X509_free);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int ssl3_send_server_certificate(SSL *s) {
|
|
CERT_PKEY *cpk;
|
|
|
|
if (s->state == SSL3_ST_SW_CERT_A) {
|
|
cpk = ssl_get_server_send_pkey(s);
|
|
if (cpk == NULL) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_send_server_certificate,
|
|
ERR_R_INTERNAL_ERROR);
|
|
return 0;
|
|
}
|
|
|
|
ssl3_output_cert_chain(s, cpk);
|
|
s->state = SSL3_ST_SW_CERT_B;
|
|
}
|
|
|
|
/* SSL3_ST_SW_CERT_B */
|
|
return ssl_do_write(s);
|
|
}
|
|
|
|
/* send a new session ticket (not necessarily for a new session) */
|
|
int ssl3_send_new_session_ticket(SSL *s) {
|
|
if (s->state == SSL3_ST_SW_SESSION_TICKET_A) {
|
|
uint8_t *session;
|
|
size_t session_len;
|
|
uint8_t *p, *macstart;
|
|
int len;
|
|
unsigned int hlen;
|
|
EVP_CIPHER_CTX ctx;
|
|
HMAC_CTX hctx;
|
|
SSL_CTX *tctx = s->initial_ctx;
|
|
uint8_t iv[EVP_MAX_IV_LENGTH];
|
|
uint8_t key_name[16];
|
|
/* The maximum overhead of encrypting the session is 16 (key name) + IV +
|
|
* one block of encryption overhead + HMAC. */
|
|
const size_t max_ticket_overhead =
|
|
16 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE;
|
|
|
|
/* Serialize the SSL_SESSION to be encoded into the ticket. */
|
|
if (!SSL_SESSION_to_bytes_for_ticket(s->session, &session, &session_len)) {
|
|
return -1;
|
|
}
|
|
|
|
/* If the session is too long, emit a dummy value rather than abort the
|
|
* connection. */
|
|
if (session_len > 0xFFFF - max_ticket_overhead) {
|
|
static const char kTicketPlaceholder[] = "TICKET TOO LARGE";
|
|
const size_t placeholder_len = strlen(kTicketPlaceholder);
|
|
|
|
OPENSSL_free(session);
|
|
|
|
p = ssl_handshake_start(s);
|
|
/* Emit ticket_lifetime_hint. */
|
|
l2n(0, p);
|
|
/* Emit ticket. */
|
|
s2n(placeholder_len, p);
|
|
memcpy(p, kTicketPlaceholder, placeholder_len);
|
|
p += placeholder_len;
|
|
|
|
len = p - ssl_handshake_start(s);
|
|
ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len);
|
|
s->state = SSL3_ST_SW_SESSION_TICKET_B;
|
|
return ssl_do_write(s);
|
|
}
|
|
|
|
/* Grow buffer if need be: the length calculation is as follows:
|
|
* handshake_header_length + 4 (ticket lifetime hint) + 2 (ticket length) +
|
|
* max_ticket_overhead + * session_length */
|
|
if (!BUF_MEM_grow(s->init_buf, SSL_HM_HEADER_LENGTH(s) + 6 +
|
|
max_ticket_overhead + session_len)) {
|
|
OPENSSL_free(session);
|
|
return -1;
|
|
}
|
|
p = ssl_handshake_start(s);
|
|
EVP_CIPHER_CTX_init(&ctx);
|
|
HMAC_CTX_init(&hctx);
|
|
/* Initialize HMAC and cipher contexts. If callback present it does all the
|
|
* work otherwise use generated values from parent ctx. */
|
|
if (tctx->tlsext_ticket_key_cb) {
|
|
if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx, &hctx, 1) < 0) {
|
|
OPENSSL_free(session);
|
|
EVP_CIPHER_CTX_cleanup(&ctx);
|
|
HMAC_CTX_cleanup(&hctx);
|
|
return -1;
|
|
}
|
|
} else {
|
|
if (!RAND_bytes(iv, 16) ||
|
|
!EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
|
|
tctx->tlsext_tick_aes_key, iv) ||
|
|
!HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, tlsext_tick_md(),
|
|
NULL)) {
|
|
OPENSSL_free(session);
|
|
EVP_CIPHER_CTX_cleanup(&ctx);
|
|
HMAC_CTX_cleanup(&hctx);
|
|
return -1;
|
|
}
|
|
memcpy(key_name, tctx->tlsext_tick_key_name, 16);
|
|
}
|
|
|
|
/* Ticket lifetime hint (advisory only): We leave this unspecified for
|
|
* resumed session (for simplicity), and guess that tickets for new
|
|
* sessions will live as long as their sessions. */
|
|
l2n(s->hit ? 0 : s->session->timeout, p);
|
|
|
|
/* Skip ticket length for now */
|
|
p += 2;
|
|
/* Output key name */
|
|
macstart = p;
|
|
memcpy(p, key_name, 16);
|
|
p += 16;
|
|
/* output IV */
|
|
memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
|
|
p += EVP_CIPHER_CTX_iv_length(&ctx);
|
|
/* Encrypt session data */
|
|
EVP_EncryptUpdate(&ctx, p, &len, session, session_len);
|
|
p += len;
|
|
EVP_EncryptFinal_ex(&ctx, p, &len);
|
|
p += len;
|
|
EVP_CIPHER_CTX_cleanup(&ctx);
|
|
|
|
HMAC_Update(&hctx, macstart, p - macstart);
|
|
HMAC_Final(&hctx, p, &hlen);
|
|
HMAC_CTX_cleanup(&hctx);
|
|
|
|
p += hlen;
|
|
/* Now write out lengths: p points to end of data written */
|
|
/* Total length */
|
|
len = p - ssl_handshake_start(s);
|
|
/* Skip ticket lifetime hint */
|
|
p = ssl_handshake_start(s) + 4;
|
|
s2n(len - 6, p);
|
|
ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len);
|
|
s->state = SSL3_ST_SW_SESSION_TICKET_B;
|
|
OPENSSL_free(session);
|
|
}
|
|
|
|
/* SSL3_ST_SW_SESSION_TICKET_B */
|
|
return ssl_do_write(s);
|
|
}
|
|
|
|
/* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
|
|
* sets the next_proto member in s if found */
|
|
int ssl3_get_next_proto(SSL *s) {
|
|
int ok;
|
|
long n;
|
|
CBS next_protocol, selected_protocol, padding;
|
|
|
|
/* Clients cannot send a NextProtocol message if we didn't see the extension
|
|
* in their ClientHello */
|
|
if (!s->s3->next_proto_neg_seen) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_next_proto,
|
|
SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
|
|
return -1;
|
|
}
|
|
|
|
n = s->method->ssl_get_message(s, SSL3_ST_SR_NEXT_PROTO_A,
|
|
SSL3_ST_SR_NEXT_PROTO_B, SSL3_MT_NEXT_PROTO,
|
|
514, /* See the payload format below */
|
|
SSL_GET_MESSAGE_HASH_MESSAGE, &ok);
|
|
|
|
if (!ok) {
|
|
return n;
|
|
}
|
|
|
|
/* s->state doesn't reflect whether ChangeCipherSpec has been received in
|
|
* this handshake, but s->s3->change_cipher_spec does (will be reset by
|
|
* ssl3_get_finished).
|
|
*
|
|
* TODO(davidben): Is this check now redundant with
|
|
* SSL3_FLAGS_EXPECT_CCS? */
|
|
if (!s->s3->change_cipher_spec) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_next_proto,
|
|
SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
|
|
return -1;
|
|
}
|
|
|
|
CBS_init(&next_protocol, s->init_msg, n);
|
|
|
|
/* The payload looks like:
|
|
* uint8 proto_len;
|
|
* uint8 proto[proto_len];
|
|
* uint8 padding_len;
|
|
* uint8 padding[padding_len]; */
|
|
if (!CBS_get_u8_length_prefixed(&next_protocol, &selected_protocol) ||
|
|
!CBS_get_u8_length_prefixed(&next_protocol, &padding) ||
|
|
CBS_len(&next_protocol) != 0 ||
|
|
!CBS_stow(&selected_protocol, &s->next_proto_negotiated,
|
|
&s->next_proto_negotiated_len)) {
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* ssl3_get_channel_id reads and verifies a ClientID handshake message. */
|
|
int ssl3_get_channel_id(SSL *s) {
|
|
int ret = -1, ok;
|
|
long n;
|
|
EVP_MD_CTX md_ctx;
|
|
uint8_t channel_id_hash[SHA256_DIGEST_LENGTH];
|
|
unsigned int channel_id_hash_len;
|
|
const uint8_t *p;
|
|
uint16_t extension_type, expected_extension_type;
|
|
EC_GROUP *p256 = NULL;
|
|
EC_KEY *key = NULL;
|
|
EC_POINT *point = NULL;
|
|
ECDSA_SIG sig;
|
|
BIGNUM x, y;
|
|
CBS encrypted_extensions, extension;
|
|
|
|
n = s->method->ssl_get_message(
|
|
s, SSL3_ST_SR_CHANNEL_ID_A, SSL3_ST_SR_CHANNEL_ID_B,
|
|
SSL3_MT_ENCRYPTED_EXTENSIONS, 2 + 2 + TLSEXT_CHANNEL_ID_SIZE,
|
|
SSL_GET_MESSAGE_DONT_HASH_MESSAGE, &ok);
|
|
|
|
if (!ok) {
|
|
return n;
|
|
}
|
|
|
|
/* Before incorporating the EncryptedExtensions message to the handshake
|
|
* hash, compute the hash that should have been signed. */
|
|
channel_id_hash_len = sizeof(channel_id_hash);
|
|
EVP_MD_CTX_init(&md_ctx);
|
|
if (!EVP_DigestInit_ex(&md_ctx, EVP_sha256(), NULL) ||
|
|
!tls1_channel_id_hash(&md_ctx, s) ||
|
|
!EVP_DigestFinal(&md_ctx, channel_id_hash, &channel_id_hash_len)) {
|
|
EVP_MD_CTX_cleanup(&md_ctx);
|
|
return -1;
|
|
}
|
|
EVP_MD_CTX_cleanup(&md_ctx);
|
|
assert(channel_id_hash_len == SHA256_DIGEST_LENGTH);
|
|
|
|
ssl3_hash_current_message(s);
|
|
|
|
/* s->state doesn't reflect whether ChangeCipherSpec has been received in
|
|
* this handshake, but s->s3->change_cipher_spec does (will be reset by
|
|
* ssl3_get_finished).
|
|
*
|
|
* TODO(davidben): Is this check now redundant with SSL3_FLAGS_EXPECT_CCS? */
|
|
if (!s->s3->change_cipher_spec) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_channel_id,
|
|
SSL_R_GOT_CHANNEL_ID_BEFORE_A_CCS);
|
|
return -1;
|
|
}
|
|
|
|
CBS_init(&encrypted_extensions, s->init_msg, n);
|
|
|
|
/* EncryptedExtensions could include multiple extensions, but the only
|
|
* extension that could be negotiated is ChannelID, so there can only be one
|
|
* entry.
|
|
*
|
|
* The payload looks like:
|
|
* uint16 extension_type
|
|
* uint16 extension_len;
|
|
* uint8 x[32];
|
|
* uint8 y[32];
|
|
* uint8 r[32];
|
|
* uint8 s[32]; */
|
|
expected_extension_type = TLSEXT_TYPE_channel_id;
|
|
if (s->s3->tlsext_channel_id_new) {
|
|
expected_extension_type = TLSEXT_TYPE_channel_id_new;
|
|
}
|
|
|
|
if (!CBS_get_u16(&encrypted_extensions, &extension_type) ||
|
|
!CBS_get_u16_length_prefixed(&encrypted_extensions, &extension) ||
|
|
CBS_len(&encrypted_extensions) != 0 ||
|
|
extension_type != expected_extension_type ||
|
|
CBS_len(&extension) != TLSEXT_CHANNEL_ID_SIZE) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_channel_id, SSL_R_INVALID_MESSAGE);
|
|
return -1;
|
|
}
|
|
|
|
p256 = EC_GROUP_new_by_curve_name(NID_X9_62_prime256v1);
|
|
if (!p256) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_channel_id, SSL_R_NO_P256_SUPPORT);
|
|
return -1;
|
|
}
|
|
|
|
BN_init(&x);
|
|
BN_init(&y);
|
|
sig.r = BN_new();
|
|
sig.s = BN_new();
|
|
|
|
p = CBS_data(&extension);
|
|
if (BN_bin2bn(p + 0, 32, &x) == NULL ||
|
|
BN_bin2bn(p + 32, 32, &y) == NULL ||
|
|
BN_bin2bn(p + 64, 32, sig.r) == NULL ||
|
|
BN_bin2bn(p + 96, 32, sig.s) == NULL) {
|
|
goto err;
|
|
}
|
|
|
|
point = EC_POINT_new(p256);
|
|
if (!point || !EC_POINT_set_affine_coordinates_GFp(p256, point, &x, &y, NULL)) {
|
|
goto err;
|
|
}
|
|
|
|
key = EC_KEY_new();
|
|
if (!key || !EC_KEY_set_group(key, p256) ||
|
|
!EC_KEY_set_public_key(key, point)) {
|
|
goto err;
|
|
}
|
|
|
|
/* We stored the handshake hash in |tlsext_channel_id| the first time that we
|
|
* were called. */
|
|
if (!ECDSA_do_verify(channel_id_hash, channel_id_hash_len, &sig, key)) {
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_channel_id,
|
|
SSL_R_CHANNEL_ID_SIGNATURE_INVALID);
|
|
s->s3->tlsext_channel_id_valid = 0;
|
|
goto err;
|
|
}
|
|
|
|
memcpy(s->s3->tlsext_channel_id, p, 64);
|
|
ret = 1;
|
|
|
|
err:
|
|
BN_free(&x);
|
|
BN_free(&y);
|
|
BN_free(sig.r);
|
|
BN_free(sig.s);
|
|
if (key) {
|
|
EC_KEY_free(key);
|
|
}
|
|
if (point) {
|
|
EC_POINT_free(point);
|
|
}
|
|
if (p256) {
|
|
EC_GROUP_free(p256);
|
|
}
|
|
return ret;
|
|
}
|