592 lines
16 KiB
C
592 lines
16 KiB
C
/* ssl/s23_srvr.c */
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/* 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) 1998-2001 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <stdio.h>
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#include "ssl_locl.h"
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#include <openssl/buffer.h>
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#include <openssl/rand.h>
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#include <openssl/objects.h>
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#include <openssl/evp.h>
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static SSL_METHOD *ssl23_get_server_method(int ver);
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int ssl23_get_client_hello(SSL *s);
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static SSL_METHOD *ssl23_get_server_method(int ver)
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{
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#ifndef OPENSSL_NO_SSL2
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if (ver == SSL2_VERSION)
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return(SSLv2_server_method());
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#endif
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if (ver == SSL3_VERSION)
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return(SSLv3_server_method());
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else if (ver == TLS1_VERSION)
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return(TLSv1_server_method());
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else
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return(NULL);
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}
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SSL_METHOD *SSLv23_server_method(void)
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{
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static int init=1;
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static SSL_METHOD SSLv23_server_data;
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if (init)
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{
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CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
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if (init)
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{
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memcpy((char *)&SSLv23_server_data,
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(char *)sslv23_base_method(),sizeof(SSL_METHOD));
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SSLv23_server_data.ssl_accept=ssl23_accept;
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SSLv23_server_data.get_ssl_method=ssl23_get_server_method;
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init=0;
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}
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CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
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}
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return(&SSLv23_server_data);
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}
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int ssl23_accept(SSL *s)
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{
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BUF_MEM *buf;
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unsigned long Time=time(NULL);
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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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RAND_add(&Time,sizeof(Time),0);
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ERR_clear_error();
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clear_sys_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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if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
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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_BEFORE:
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case SSL_ST_ACCEPT:
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case SSL_ST_BEFORE|SSL_ST_ACCEPT:
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case SSL_ST_OK|SSL_ST_ACCEPT:
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s->server=1;
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if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
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/* s->version=SSL3_VERSION; */
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s->type=SSL_ST_ACCEPT;
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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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ssl3_init_finished_mac(s);
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s->state=SSL23_ST_SR_CLNT_HELLO_A;
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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_A:
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case SSL23_ST_SR_CLNT_HELLO_B:
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s->shutdown=0;
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ret=ssl23_get_client_hello(s);
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if (ret >= 0) cb=NULL;
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goto end;
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/* break; */
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default:
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SSLerr(SSL_F_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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int ssl23_get_client_hello(SSL *s)
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{
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char buf_space[11]; /* Request this many bytes in initial read.
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* We can detect SSL 3.0/TLS 1.0 Client Hellos
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* ('type == 3') correctly only when the following
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* is in a single record, which is not guaranteed by
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* the protocol specification:
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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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char *buf= &(buf_space[0]);
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unsigned char *p,*d,*d_len,*dd;
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unsigned int i;
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unsigned int csl,sil,cl;
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int n=0,j;
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int type=0;
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int v[2];
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if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
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{
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/* read the initial header */
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v[0]=v[1]=0;
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if (!ssl3_setup_buffers(s)) goto err;
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n=ssl23_read_bytes(s, sizeof buf_space);
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if (n != sizeof buf_space) return(n); /* n == -1 || n == 0 */
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p=s->packet;
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memcpy(buf,p,n);
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if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
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{
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/*
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* SSLv2 header
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*/
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if ((p[3] == 0x00) && (p[4] == 0x02))
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{
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v[0]=p[3]; v[1]=p[4];
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/* SSLv2 */
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if (!(s->options & SSL_OP_NO_SSLv2))
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type=1;
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}
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else if (p[3] == SSL3_VERSION_MAJOR)
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{
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v[0]=p[3]; v[1]=p[4];
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/* SSLv3/TLSv1 */
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if (p[4] >= TLS1_VERSION_MINOR)
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{
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if (!(s->options & SSL_OP_NO_TLSv1))
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{
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s->version=TLS1_VERSION;
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/* type=2; */ /* done later to survive restarts */
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s->state=SSL23_ST_SR_CLNT_HELLO_B;
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}
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else if (!(s->options & SSL_OP_NO_SSLv3))
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{
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s->version=SSL3_VERSION;
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/* type=2; */
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s->state=SSL23_ST_SR_CLNT_HELLO_B;
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}
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else if (!(s->options & SSL_OP_NO_SSLv2))
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{
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type=1;
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}
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}
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else if (!(s->options & SSL_OP_NO_SSLv3))
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{
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s->version=SSL3_VERSION;
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/* type=2; */
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s->state=SSL23_ST_SR_CLNT_HELLO_B;
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}
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else if (!(s->options & SSL_OP_NO_SSLv2))
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type=1;
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}
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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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((p[3] == 0 && p[4] < 5 /* silly record length? */)
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|| (p[9] == p[1])))
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{
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/*
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* SSLv3 or tls1 header
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*/
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v[0]=p[1]; /* major version (= SSL3_VERSION_MAJOR) */
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/* We must look at client_version inside the Client Hello message
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* to get the correct minor version.
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* However if we have only a pathologically small fragment of the
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* Client Hello message, this would be difficult, and we'd have
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* to read more records to find out.
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* No known SSL 3.0 client fragments ClientHello like this,
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* so we simply assume TLS 1.0 to avoid protocol version downgrade
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* attacks. */
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if (p[3] == 0 && p[4] < 6)
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{
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#if 0
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SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_SMALL);
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goto err;
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#else
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v[1] = TLS1_VERSION_MINOR;
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#endif
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}
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else
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v[1]=p[10]; /* minor version according to client_version */
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if (v[1] >= TLS1_VERSION_MINOR)
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{
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if (!(s->options & SSL_OP_NO_TLSv1))
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{
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s->version=TLS1_VERSION;
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type=3;
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}
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else if (!(s->options & SSL_OP_NO_SSLv3))
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{
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s->version=SSL3_VERSION;
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type=3;
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}
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}
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else
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{
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/* client requests SSL 3.0 */
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if (!(s->options & SSL_OP_NO_SSLv3))
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{
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s->version=SSL3_VERSION;
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type=3;
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}
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else if (!(s->options & SSL_OP_NO_TLSv1))
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{
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/* we won't be able to use TLS of course,
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* but this will send an appropriate alert */
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s->version=TLS1_VERSION;
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type=3;
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}
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}
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}
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else 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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SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
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goto err;
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}
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else if (strncmp("CONNECT",(char *)p,7) == 0)
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{
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SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
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goto err;
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}
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}
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if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
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{
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/* we have SSLv3/TLSv1 in an SSLv2 header
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* (other cases skip this state) */
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type=2;
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p=s->packet;
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v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
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v[1] = p[4];
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n=((p[0]&0x7f)<<8)|p[1];
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if (n > (1024*4))
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{
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SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
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goto err;
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}
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j=ssl23_read_bytes(s,n+2);
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if (j <= 0) return(j);
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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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p=s->packet;
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p+=5;
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n2s(p,csl);
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n2s(p,sil);
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n2s(p,cl);
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d=(unsigned char *)s->init_buf->data;
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if ((csl+sil+cl+11) != s->packet_length)
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{
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SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
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goto err;
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}
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/* record header: msg_type ... */
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*(d++) = SSL3_MT_CLIENT_HELLO;
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/* ... and length (actual value will be written later) */
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d_len = d;
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d += 3;
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/* client_version */
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*(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
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*(d++) = v[1];
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/* lets populate the random area */
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/* get the challenge_length */
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i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
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memset(d,0,SSL3_RANDOM_SIZE);
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memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
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d+=SSL3_RANDOM_SIZE;
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/* no session-id reuse */
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*(d++)=0;
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/* ciphers */
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j=0;
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dd=d;
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d+=2;
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for (i=0; i<csl; i+=3)
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{
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if (p[i] != 0) continue;
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*(d++)=p[i+1];
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*(d++)=p[i+2];
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j+=2;
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}
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s2n(j,dd);
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/* COMPRESSION */
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*(d++)=1;
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*(d++)=0;
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i = (d-(unsigned char *)s->init_buf->data) - 4;
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l2n3((long)i, d_len);
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/* get the data reused from the init_buf */
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s->s3->tmp.reuse_message=1;
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s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
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s->s3->tmp.message_size=i;
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}
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/* imaginary new state (for program structure): */
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/* s->state = SSL23_SR_CLNT_HELLO_C */
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if (type == 1)
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{
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#ifdef OPENSSL_NO_SSL2
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SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
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goto err;
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#else
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/* we are talking sslv2 */
|
|
/* we need to clean up the SSLv3/TLSv1 setup and put in the
|
|
* sslv2 stuff. */
|
|
|
|
if (s->s2 == NULL)
|
|
{
|
|
if (!ssl2_new(s))
|
|
goto err;
|
|
}
|
|
else
|
|
ssl2_clear(s);
|
|
|
|
if (s->s3 != NULL) ssl3_free(s);
|
|
|
|
if (!BUF_MEM_grow_clean(s->init_buf,
|
|
SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
|
|
{
|
|
goto err;
|
|
}
|
|
|
|
s->state=SSL2_ST_GET_CLIENT_HELLO_A;
|
|
if (s->options & SSL_OP_NO_TLSv1 && s->options & SSL_OP_NO_SSLv3)
|
|
s->s2->ssl2_rollback=0;
|
|
else
|
|
/* reject SSL 2.0 session if client supports SSL 3.0 or TLS 1.0
|
|
* (SSL 3.0 draft/RFC 2246, App. E.2) */
|
|
s->s2->ssl2_rollback=1;
|
|
|
|
/* setup the n bytes we have read so we get them from
|
|
* the sslv2 buffer */
|
|
s->rstate=SSL_ST_READ_HEADER;
|
|
s->packet_length=n;
|
|
s->packet= &(s->s2->rbuf[0]);
|
|
memcpy(s->packet,buf,n);
|
|
s->s2->rbuf_left=n;
|
|
s->s2->rbuf_offs=0;
|
|
|
|
s->method=SSLv2_server_method();
|
|
s->handshake_func=s->method->ssl_accept;
|
|
#endif
|
|
}
|
|
|
|
if ((type == 2) || (type == 3))
|
|
{
|
|
/* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */
|
|
|
|
if (!ssl_init_wbio_buffer(s,1)) goto err;
|
|
|
|
/* we are in this state */
|
|
s->state=SSL3_ST_SR_CLNT_HELLO_A;
|
|
|
|
if (type == 3)
|
|
{
|
|
/* put the 'n' bytes we have read into the input buffer
|
|
* for SSLv3 */
|
|
s->rstate=SSL_ST_READ_HEADER;
|
|
s->packet_length=n;
|
|
s->packet= &(s->s3->rbuf.buf[0]);
|
|
memcpy(s->packet,buf,n);
|
|
s->s3->rbuf.left=n;
|
|
s->s3->rbuf.offset=0;
|
|
}
|
|
else
|
|
{
|
|
s->packet_length=0;
|
|
s->s3->rbuf.left=0;
|
|
s->s3->rbuf.offset=0;
|
|
}
|
|
|
|
if (s->version == TLS1_VERSION)
|
|
s->method = TLSv1_server_method();
|
|
else
|
|
s->method = SSLv3_server_method();
|
|
#if 0 /* ssl3_get_client_hello does this */
|
|
s->client_version=(v[0]<<8)|v[1];
|
|
#endif
|
|
s->handshake_func=s->method->ssl_accept;
|
|
}
|
|
|
|
if ((type < 1) || (type > 3))
|
|
{
|
|
/* bad, very bad */
|
|
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
|
|
goto err;
|
|
}
|
|
s->init_num=0;
|
|
|
|
if (buf != buf_space) OPENSSL_free(buf);
|
|
s->first_packet=1;
|
|
return(SSL_accept(s));
|
|
err:
|
|
if (buf != buf_space) OPENSSL_free(buf);
|
|
return(-1);
|
|
}
|