e99e912bea
SSL3_ENC_METHOD will remain version-specific while SSL_METHOD will become
protocol-specific. This finally removes all the version-specific portions of
SSL_METHOD but the version tag itself.
(SSL3_ENC_METHOD's version-specific bits themselves can probably be handled by
tracking a canonicalized protocol version. It would simplify version
comparisons anyway. The one catch is SSLv3 has a very different table. But
that's a cleanup for future. Then again, perhaps a version-specific method
table swap somewhere will be useful later for TLS 1.3.)
Much of this commit was generated with sed invocation:
s/method->ssl3_enc/enc_method/g
Change-Id: I2b192507876aadd4f9310240687e562e56e6c0b1
Reviewed-on: https://boringssl-review.googlesource.com/2581
Reviewed-by: Adam Langley <agl@google.com>
491 lines
16 KiB
C
491 lines
16 KiB
C
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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/* ====================================================================
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* Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com). */
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#include <assert.h>
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#include <stdio.h>
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#include <openssl/buf.h>
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#include <openssl/err.h>
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#include <openssl/evp.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 "ssl_locl.h"
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static int ssl23_get_client_hello(SSL *s);
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static int ssl23_get_v2_client_hello(SSL *s);
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int ssl23_accept(SSL *s)
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{
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BUF_MEM *buf;
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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;
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assert(s->handshake_func == ssl23_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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s->in_handshake++;
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for (;;)
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{
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state=s->state;
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switch(s->state)
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{
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case SSL_ST_ACCEPT:
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case SSL_ST_BEFORE|SSL_ST_ACCEPT:
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if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
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if (s->init_buf == NULL)
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{
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if ((buf=BUF_MEM_new()) == NULL)
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{
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ret= -1;
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goto end;
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}
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if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
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{
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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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}
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if (!ssl3_init_finished_mac(s))
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{
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OPENSSL_PUT_ERROR(SSL, ssl23_accept, ERR_R_INTERNAL_ERROR);
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ret = -1;
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goto end;
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}
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s->state=SSL23_ST_SR_CLNT_HELLO;
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s->ctx->stats.sess_accept++;
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s->init_num=0;
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break;
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case SSL23_ST_SR_CLNT_HELLO:
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s->shutdown = 0;
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ret = ssl23_get_client_hello(s);
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if (ret <= 0) goto end;
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break;
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case SSL23_ST_SR_V2_CLNT_HELLO:
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ret = ssl23_get_v2_client_hello(s);
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if (ret <= 0) goto end;
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break;
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case SSL23_ST_SR_SWITCH_VERSION:
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if (!ssl_init_wbio_buffer(s, 1))
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{
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ret = -1;
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goto end;
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}
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s->state = SSL3_ST_SR_CLNT_HELLO_A;
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s->method = ssl3_get_method(s->version);
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assert(s->method != NULL);
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s->enc_method = ssl3_get_enc_method(s->version);
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assert(s->enc_method != NULL);
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s->handshake_func = s->method->ssl_accept;
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s->init_num = 0;
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/* NULL the callback; SSL_accept will call it instead. */
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cb = NULL;
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ret = SSL_accept(s);
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goto end;
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/* break; */
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default:
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OPENSSL_PUT_ERROR(SSL, ssl23_accept, SSL_R_UNKNOWN_STATE);
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ret= -1;
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goto end;
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/* break; */
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}
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if ((cb != NULL) && (s->state != state))
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{
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new_state=s->state;
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s->state=state;
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cb(s,SSL_CB_ACCEPT_LOOP,1);
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s->state=new_state;
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}
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}
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end:
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s->in_handshake--;
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if (cb != NULL)
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cb(s,SSL_CB_ACCEPT_EXIT,ret);
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return(ret);
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}
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static int ssl23_get_client_hello(SSL *s)
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{
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uint8_t *p;
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int n = 0;
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/* Sniff enough of the input to determine ClientHello type and the
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* client version. */
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if (!ssl3_setup_buffers(s)) goto err;
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/* Read the initial 11 bytes of the input. This is sufficient to
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* determine the client version for a ClientHello or a
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* V2ClientHello.
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*
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* ClientHello (assuming client_version is unfragmented):
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* Byte Content
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* 0 type \
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* 1-2 version > record header
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* 3-4 length /
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* 5 msg_type \
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* 6-8 length > Client Hello message
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* 9-10 client_version /
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*
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* V2ClientHello:
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* Byte Content
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* 0-1 msg_length
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* 2 msg_type
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* 3-4 version
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* 5-6 cipher_spec_length
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* 7-8 session_id_length
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* 9-10 challenge_length
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*/
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n = ssl23_read_bytes(s, 11);
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if (n <= 0)
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return n;
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assert(n == 11);
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p = s->packet;
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/* Some dedicated error codes for protocol mixups should the application
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* wish to interpret them differently. (These do not overlap with
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* ClientHello or V2ClientHello.) */
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if ((strncmp("GET ", (char *)p, 4) == 0) ||
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(strncmp("POST ",(char *)p, 5) == 0) ||
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(strncmp("HEAD ",(char *)p, 5) == 0) ||
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(strncmp("PUT ", (char *)p, 4) == 0))
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{
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OPENSSL_PUT_ERROR(SSL, ssl23_get_client_hello, SSL_R_HTTP_REQUEST);
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goto err;
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}
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if (strncmp("CONNECT",(char *)p, 7) == 0)
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{
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OPENSSL_PUT_ERROR(SSL, ssl23_get_client_hello, SSL_R_HTTPS_PROXY_REQUEST);
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goto err;
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}
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/* Determine if this is a ClientHello or V2ClientHello. */
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if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
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{
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/* This is a V2ClientHello. Determine the version to
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* use. */
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uint16_t client_version = (p[3] << 8) | p[4];
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uint16_t version = ssl3_get_mutual_version(s, client_version);
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if (version == 0)
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{
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OPENSSL_PUT_ERROR(SSL, ssl23_get_client_hello, SSL_R_UNSUPPORTED_PROTOCOL);
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goto err;
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}
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s->version = version;
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/* Parse the entire V2ClientHello. */
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s->state = SSL23_ST_SR_V2_CLNT_HELLO;
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}
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else if ((p[0] == SSL3_RT_HANDSHAKE) &&
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(p[1] >= SSL3_VERSION_MAJOR) &&
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(p[5] == SSL3_MT_CLIENT_HELLO))
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{
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/* This is a fragment of a ClientHello. We look at the
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* client_hello to negotiate the version. However, this
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* is difficult if we have only a pathologically small
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* fragment. No known client fragments ClientHello like
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* this, so we simply reject such connections to avoid
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* protocol version downgrade attacks. */
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uint16_t record_length = (p[3] << 8) | p[4];
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uint16_t client_version, version;
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if (record_length < 6)
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{
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OPENSSL_PUT_ERROR(SSL, ssl23_get_client_hello, SSL_R_RECORD_TOO_SMALL);
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goto err;
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}
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client_version = (p[9] << 8) | p[10];
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version = ssl3_get_mutual_version(s, client_version);
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if (version == 0)
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{
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OPENSSL_PUT_ERROR(SSL, ssl23_get_client_hello, SSL_R_UNSUPPORTED_PROTOCOL);
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goto err;
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}
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s->version = version;
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/* Reset the record-layer state for SSL3. */
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assert(s->rstate == SSL_ST_READ_HEADER);
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s->s3->rbuf.left = s->packet_length;
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s->s3->rbuf.offset = 0;
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s->packet_length = 0;
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/* Ready to switch versions. */
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s->state = SSL23_ST_SR_SWITCH_VERSION;
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}
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else
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{
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OPENSSL_PUT_ERROR(SSL, ssl23_get_client_hello, SSL_R_UNKNOWN_PROTOCOL);
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goto err;
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}
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return 1;
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err:
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return -1;
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}
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static int ssl23_get_v2_client_hello(SSL *s)
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{
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uint8_t *p;
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size_t rand_len;
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int n = 0;
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CBS v2_client_hello, cipher_specs, session_id, challenge;
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size_t msg_length, len;
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uint8_t msg_type;
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uint16_t version, cipher_spec_length, session_id_length, challenge_length;
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CBB client_hello, hello_body, cipher_suites;
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uint8_t random[SSL3_RANDOM_SIZE];
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/* Read the remainder of the V2ClientHello. We have previously read 11
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* bytes in ssl23_get_client_hello. */
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p = s->packet;
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msg_length = ((p[0] & 0x7f) << 8) | p[1];
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if (msg_length > (1024 * 4))
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{
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OPENSSL_PUT_ERROR(SSL, ssl23_get_v2_client_hello, SSL_R_RECORD_TOO_LARGE);
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goto err;
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}
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if (msg_length < 11 - 2)
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{
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/* Reject lengths that are too short early. We have already read
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* 11 bytes, so we should not attempt to process an (invalid)
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* V2ClientHello which would be shorter than that. */
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OPENSSL_PUT_ERROR(SSL, ssl23_get_v2_client_hello, SSL_R_RECORD_LENGTH_MISMATCH);
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goto err;
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}
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n = ssl23_read_bytes(s, msg_length + 2);
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if (n <= 0)
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return n;
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assert(n == s->packet_length);
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/* The V2ClientHello without the length is incorporated into the
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* Finished hash. */
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ssl3_finish_mac(s, s->packet + 2, s->packet_length - 2);
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if (s->msg_callback)
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s->msg_callback(0, SSL2_VERSION, 0, s->packet+2, s->packet_length-2, s, s->msg_callback_arg); /* CLIENT-HELLO */
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CBS_init(&v2_client_hello, s->packet + 2, s->packet_length - 2);
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if (!CBS_get_u8(&v2_client_hello, &msg_type) ||
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!CBS_get_u16(&v2_client_hello, &version) ||
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!CBS_get_u16(&v2_client_hello, &cipher_spec_length) ||
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!CBS_get_u16(&v2_client_hello, &session_id_length) ||
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!CBS_get_u16(&v2_client_hello, &challenge_length) ||
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!CBS_get_bytes(&v2_client_hello, &cipher_specs, cipher_spec_length) ||
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!CBS_get_bytes(&v2_client_hello, &session_id, session_id_length) ||
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!CBS_get_bytes(&v2_client_hello, &challenge, challenge_length) ||
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CBS_len(&v2_client_hello) != 0)
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{
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OPENSSL_PUT_ERROR(SSL, ssl23_get_v2_client_hello, SSL_R_DECODE_ERROR);
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goto err;
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}
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|
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/* msg_type has already been checked. */
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assert(msg_type == SSL2_MT_CLIENT_HELLO);
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|
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/* The client_random is the V2ClientHello challenge. Truncate or
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|
* left-pad with zeros as needed. */
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memset(random, 0, SSL3_RANDOM_SIZE);
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rand_len = CBS_len(&challenge);
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if (rand_len > SSL3_RANDOM_SIZE)
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rand_len = SSL3_RANDOM_SIZE;
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memcpy(random + (SSL3_RANDOM_SIZE - rand_len), CBS_data(&challenge), rand_len);
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|
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/* Write out an equivalent SSLv3 ClientHello. */
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if (!CBB_init_fixed(&client_hello, (uint8_t *)s->init_buf->data, s->init_buf->max))
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{
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OPENSSL_PUT_ERROR(SSL, ssl23_get_v2_client_hello, ERR_R_MALLOC_FAILURE);
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|
goto err;
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|
}
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|
if (!CBB_add_u8(&client_hello, SSL3_MT_CLIENT_HELLO) ||
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|
!CBB_add_u24_length_prefixed(&client_hello, &hello_body) ||
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|
!CBB_add_u16(&hello_body, version) ||
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!CBB_add_bytes(&hello_body, random, SSL3_RANDOM_SIZE) ||
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/* No session id. */
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!CBB_add_u8(&hello_body, 0) ||
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!CBB_add_u16_length_prefixed(&hello_body, &cipher_suites))
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{
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CBB_cleanup(&client_hello);
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OPENSSL_PUT_ERROR(SSL, ssl23_get_v2_client_hello, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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|
|
/* Copy the cipher suites. */
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|
while (CBS_len(&cipher_specs) > 0)
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|
{
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uint32_t cipher_spec;
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if (!CBS_get_u24(&cipher_specs, &cipher_spec))
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{
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CBB_cleanup(&client_hello);
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OPENSSL_PUT_ERROR(SSL, ssl23_get_v2_client_hello, SSL_R_DECODE_ERROR);
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goto err;
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}
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|
|
/* Skip SSLv2 ciphers. */
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|
if ((cipher_spec & 0xff0000) != 0)
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continue;
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if (!CBB_add_u16(&cipher_suites, cipher_spec))
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{
|
|
CBB_cleanup(&client_hello);
|
|
OPENSSL_PUT_ERROR(SSL, ssl23_get_v2_client_hello, ERR_R_INTERNAL_ERROR);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
/* 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, ssl23_get_v2_client_hello, ERR_R_INTERNAL_ERROR);
|
|
goto err;
|
|
}
|
|
|
|
/* 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;
|
|
|
|
/* Reset the record layer for SSL3. */
|
|
assert(s->rstate == SSL_ST_READ_HEADER);
|
|
s->packet_length = 0;
|
|
s->s3->rbuf.left = 0;
|
|
s->s3->rbuf.offset = 0;
|
|
|
|
s->state = SSL23_ST_SR_SWITCH_VERSION;
|
|
return 1;
|
|
err:
|
|
return -1;
|
|
}
|