ssl/s23_srvr.c - platform/external/openssl - Git at Google

 /* ssl/s23_srvr.c */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
  * This package is an SSL implementation written
  * by Eric Young (eay@cryptsoft.com).
  * The implementation was written so as to conform with Netscapes SSL.
  *
  * This library is free for commercial and non-commercial use as long as
  * the following conditions are aheared to.  The following conditions
  * apply to all code found in this distribution, be it the RC4, RSA,
  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  * included with this distribution is covered by the same copyright terms
  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  *
  * Copyright remains Eric Young's, and as such any Copyright notices in
  * the code are not to be removed.
  * If this package is used in a product, Eric Young should be given attribution
  * as the author of the parts of the library used.
  * This can be in the form of a textual message at program startup or
  * in documentation (online or textual) provided with the package.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. All advertising materials mentioning features or use of this software
  *    must display the following acknowledgement:
  *    "This product includes cryptographic software written by
  *     Eric Young (eay@cryptsoft.com)"
  *    The word 'cryptographic' can be left out if the rouines from the library
  *    being used are not cryptographic related :-).
  * 4. If you include any Windows specific code (or a derivative thereof) from
  *    the apps directory (application code) you must include an acknowledgement:
  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  *
  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
  * The licence and distribution terms for any publically available version or
  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  * copied and put under another distribution licence
  * [including the GNU Public Licence.]
  */
 /* ====================================================================
  * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
  *
  * 3. All advertising materials mentioning features or use of this
  *    software must display the following acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  *
  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  *    endorse or promote products derived from this software without
  *    prior written permission. For written permission, please contact
  *    openssl-core@openssl.org.
  *
  * 5. Products derived from this software may not be called "OpenSSL"
  *    nor may "OpenSSL" appear in their names without prior written
  *    permission of the OpenSSL Project.
  *
  * 6. Redistributions of any form whatsoever must retain the following
  *    acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  *
  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  * ====================================================================
  *
  * This product includes cryptographic software written by Eric Young
  * (eay@cryptsoft.com).  This product includes software written by Tim
  * Hudson (tjh@cryptsoft.com).
  *
  */

 #include <stdio.h>
 #include "ssl_locl.h"
 #include <openssl/buffer.h>
 #include <openssl/rand.h>
 #include <openssl/objects.h>
 #include <openssl/evp.h>

 static SSL_METHOD *ssl23_get_server_method(int ver);
 int ssl23_get_client_hello(SSL *s);
 static SSL_METHOD *ssl23_get_server_method(int ver)
 	{
 #ifndef OPENSSL_NO_SSL2
 	if (ver == SSL2_VERSION)
 		return(SSLv2_server_method());
 #endif
 	if (ver == SSL3_VERSION)
 		return(SSLv3_server_method());
 	else if (ver == TLS1_VERSION)
 		return(TLSv1_server_method());
 	else
 		return(NULL);
 	}

 IMPLEMENT_ssl23_meth_func(SSLv23_server_method,
 			ssl23_accept,
 			ssl_undefined_function,
 			ssl23_get_server_method)

 int ssl23_accept(SSL *s)
 	{
 	BUF_MEM *buf;
 	unsigned long Time=(unsigned long)time(NULL);
 	void (*cb)(const SSL *ssl,int type,int val)=NULL;
 	int ret= -1;
 	int new_state,state;

 	RAND_add(&Time,sizeof(Time),0);
 	ERR_clear_error();
 	clear_sys_error();

 	if (s->info_callback != NULL)
 		cb=s->info_callback;
 	else if (s->ctx->info_callback != NULL)
 		cb=s->ctx->info_callback;

 	s->in_handshake++;
 	if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);

 	for (;;)
 		{
 		state=s->state;

 		switch(s->state)
 			{
 		case SSL_ST_BEFORE:
 		case SSL_ST_ACCEPT:
 		case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 		case SSL_ST_OK|SSL_ST_ACCEPT:

 			s->server=1;
 			if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);

 			/* s->version=SSL3_VERSION; */
 			s->type=SSL_ST_ACCEPT;

 			if (s->init_buf == NULL)
 				{
 				if ((buf=BUF_MEM_new()) == NULL)
 					{
 					ret= -1;
 					goto end;
 					}
 				if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 					{
 					ret= -1;
 					goto end;
 					}
 				s->init_buf=buf;
 				}

 			ssl3_init_finished_mac(s);

 			s->state=SSL23_ST_SR_CLNT_HELLO_A;
 			s->ctx->stats.sess_accept++;
 			s->init_num=0;
 			break;

 		case SSL23_ST_SR_CLNT_HELLO_A:
 		case SSL23_ST_SR_CLNT_HELLO_B:

 			s->shutdown=0;
 			ret=ssl23_get_client_hello(s);
 			if (ret >= 0) cb=NULL;
 			goto end;
 			/* break; */

 		default:
 			SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
 			ret= -1;
 			goto end;
 			/* break; */
 			}

 		if ((cb != NULL) && (s->state != state))
 			{
 			new_state=s->state;
 			s->state=state;
 			cb(s,SSL_CB_ACCEPT_LOOP,1);
 			s->state=new_state;
 			}
 		}
 end:
 	s->in_handshake--;
 	if (cb != NULL)
 		cb(s,SSL_CB_ACCEPT_EXIT,ret);
 	return(ret);
 	}


 int ssl23_get_client_hello(SSL *s)
 	{
 	char buf_space[11]; /* Request this many bytes in initial read.
 	                     * We can detect SSL 3.0/TLS 1.0 Client Hellos
 	                     * ('type == 3') correctly only when the following
 	                     * is in a single record, which is not guaranteed by
 	                     * the protocol specification:
 	                     * Byte  Content
 	                     *  0     type            \
 	                     *  1/2   version          > record header
 	                     *  3/4   length          /
 	                     *  5     msg_type        \
 	                     *  6-8   length           > Client Hello message
 	                     *  9/10  client_version  /
 	                     */
 	char *buf= &(buf_space[0]);
 	unsigned char *p,*d,*d_len,*dd;
 	unsigned int i;
 	unsigned int csl,sil,cl;
 	int n=0,j;
 	int type=0;
 	int v[2];

 	if (s->state ==	SSL23_ST_SR_CLNT_HELLO_A)
 		{
 		/* read the initial header */
 		v[0]=v[1]=0;

 		if (!ssl3_setup_buffers(s)) goto err;

 		n=ssl23_read_bytes(s, sizeof buf_space);
 		if (n != sizeof buf_space) return(n); /* n == -1 || n == 0 */

 		p=s->packet;

 		memcpy(buf,p,n);

 		if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
 			{
 			/*
 			 * SSLv2 header
 			 */
 			if ((p[3] == 0x00) && (p[4] == 0x02))
 				{
 				v[0]=p[3]; v[1]=p[4];
 				/* SSLv2 */
 				if (!(s->options & SSL_OP_NO_SSLv2))
 					type=1;
 				}
 			else if (p[3] == SSL3_VERSION_MAJOR)
 				{
 				v[0]=p[3]; v[1]=p[4];
 				/* SSLv3/TLSv1 */
 				if (p[4] >= TLS1_VERSION_MINOR)
 					{
 					if (!(s->options & SSL_OP_NO_TLSv1))
 						{
 						s->version=TLS1_VERSION;
 						/* type=2; */ /* done later to survive restarts */
 						s->state=SSL23_ST_SR_CLNT_HELLO_B;
 						}
 					else if (!(s->options & SSL_OP_NO_SSLv3))
 						{
 						s->version=SSL3_VERSION;
 						/* type=2; */
 						s->state=SSL23_ST_SR_CLNT_HELLO_B;
 						}
 					else if (!(s->options & SSL_OP_NO_SSLv2))
 						{
 						type=1;
 						}
 					}
 				else if (!(s->options & SSL_OP_NO_SSLv3))
 					{
 					s->version=SSL3_VERSION;
 					/* type=2; */
 					s->state=SSL23_ST_SR_CLNT_HELLO_B;
 					}
 				else if (!(s->options & SSL_OP_NO_SSLv2))
 					type=1;

 				}
 			}
 		else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 			 (p[1] == SSL3_VERSION_MAJOR) &&
 			 (p[5] == SSL3_MT_CLIENT_HELLO) &&
 			 ((p[3] == 0 && p[4] < 5 /* silly record length? */)
 				|| (p[9] == p[1])))
 			{
 			/*
 			 * SSLv3 or tls1 header
 			 */

 			v[0]=p[1]; /* major version (= SSL3_VERSION_MAJOR) */
 			/* We must look at client_version inside the Client Hello message
 			 * to get the correct minor version.
 			 * However if we have only a pathologically small fragment of the
 			 * Client Hello message, this would be difficult, and we'd have
 			 * to read more records to find out.
 			 * No known SSL 3.0 client fragments ClientHello like this,
 			 * so we simply assume TLS 1.0 to avoid protocol version downgrade
 			 * attacks. */
 			if (p[3] == 0 && p[4] < 6)
 				{
 #if 0
 				SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_SMALL);
 				goto err;
 #else
 				v[1] = TLS1_VERSION_MINOR;
 #endif
 				}
 			else
 				v[1]=p[10]; /* minor version according to client_version */
 			if (v[1] >= TLS1_VERSION_MINOR)
 				{
 				if (!(s->options & SSL_OP_NO_TLSv1))
 					{
 					s->version=TLS1_VERSION;
 					type=3;
 					}
 				else if (!(s->options & SSL_OP_NO_SSLv3))
 					{
 					s->version=SSL3_VERSION;
 					type=3;
 					}
 				}
 			else
 				{
 				/* client requests SSL 3.0 */
 				if (!(s->options & SSL_OP_NO_SSLv3))
 					{
 					s->version=SSL3_VERSION;
 					type=3;
 					}
 				else if (!(s->options & SSL_OP_NO_TLSv1))
 					{
 					/* we won't be able to use TLS of course,
 					 * but this will send an appropriate alert */
 					s->version=TLS1_VERSION;
 					type=3;
 					}
 				}
 			}
 		else if ((strncmp("GET ", (char *)p,4) == 0) ||
 			 (strncmp("POST ",(char *)p,5) == 0) ||
 			 (strncmp("HEAD ",(char *)p,5) == 0) ||
 			 (strncmp("PUT ", (char *)p,4) == 0))
 			{
 			SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
 			goto err;
 			}
 		else if (strncmp("CONNECT",(char *)p,7) == 0)
 			{
 			SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
 			goto err;
 			}
 		}

 #ifdef OPENSSL_FIPS
 	if (FIPS_mode() && (s->version < TLS1_VERSION))
 		{
 		SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
 					SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
 		goto err;
 		}
 #endif

 	if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
 		{
 		/* we have SSLv3/TLSv1 in an SSLv2 header
 		 * (other cases skip this state) */

 		type=2;
 		p=s->packet;
 		v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
 		v[1] = p[4];

 /* The SSL2 protocol allows n to be larger, just pick
  * a reasonable buffer size. */
 #if SSL3_RT_DEFAULT_PACKET_SIZE < 1024*4 - SSL3_RT_DEFAULT_WRITE_OVERHEAD
 #error "SSL3_RT_DEFAULT_PACKET_SIZE is too small."
 #endif
 		n=((p[0]&0x7f)<<8)|p[1];
 		if (n > SSL3_RT_DEFAULT_PACKET_SIZE - 2)
 			{
 			SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
 			goto err;
 			}

 		j=ssl23_read_bytes(s,n+2);
 		if (j <= 0) return(j);

 		ssl3_finish_mac(s, s->packet+2, s->packet_length-2);
 		if (s->msg_callback)
 			s->msg_callback(0, SSL2_VERSION, 0, s->packet+2, s->packet_length-2, s, s->msg_callback_arg); /* CLIENT-HELLO */

 		p=s->packet;
 		p+=5;
 		n2s(p,csl);
 		n2s(p,sil);
 		n2s(p,cl);
 		d=(unsigned char *)s->init_buf->data;
 		if ((csl+sil+cl+11) != s->packet_length)
 			{
 			SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
 			goto err;
 			}

 		/* record header: msg_type ... */
 		*(d++) = SSL3_MT_CLIENT_HELLO;
 		/* ... and length (actual value will be written later) */
 		d_len = d;
 		d += 3;

 		/* client_version */
 		*(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
 		*(d++) = v[1];

 		/* lets populate the random area */
 		/* get the challenge_length */
 		i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
 		memset(d,0,SSL3_RANDOM_SIZE);
 		memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
 		d+=SSL3_RANDOM_SIZE;

 		/* no session-id reuse */
 		*(d++)=0;

 		/* ciphers */
 		j=0;
 		dd=d;
 		d+=2;
 		for (i=0; i<csl; i+=3)
 			{
 			if (p[i] != 0) continue;
 			*(d++)=p[i+1];
 			*(d++)=p[i+2];
 			j+=2;
 			}
 		s2n(j,dd);

 		/* COMPRESSION */
 		*(d++)=1;
 		*(d++)=0;

 		i = (d-(unsigned char *)s->init_buf->data) - 4;
 		l2n3((long)i, d_len);

 		/* get the data reused from the init_buf */
 		s->s3->tmp.reuse_message=1;
 		s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
 		s->s3->tmp.message_size=i;
 		}

 	/* imaginary new state (for program structure): */
 	/* s->state = SSL23_SR_CLNT_HELLO_C */

 	if (type == 1)
 		{
 #ifdef OPENSSL_NO_SSL2
 		SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 		goto err;
 #else
 		/* 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);
 	return(SSL_accept(s));
 err:
 	if (buf != buf_space) OPENSSL_free(buf);
 	return(-1);
 	}
	/* ssl/s23_srvr.c */
	/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
	* All rights reserved.
	*
	* This package is an SSL implementation written
	* by Eric Young (eay@cryptsoft.com).
	* The implementation was written so as to conform with Netscapes SSL.
	*
	* This library is free for commercial and non-commercial use as long as
	* the following conditions are aheared to. The following conditions
	* apply to all code found in this distribution, be it the RC4, RSA,
	* lhash, DES, etc., code; not just the SSL code. The SSL documentation
	* included with this distribution is covered by the same copyright terms
	* except that the holder is Tim Hudson (tjh@cryptsoft.com).
	*
	* Copyright remains Eric Young's, and as such any Copyright notices in
	* the code are not to be removed.
	* If this package is used in a product, Eric Young should be given attribution
	* as the author of the parts of the library used.
	* This can be in the form of a textual message at program startup or
	* in documentation (online or textual) provided with the package.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. All advertising materials mentioning features or use of this software
	* must display the following acknowledgement:
	* "This product includes cryptographic software written by
	* Eric Young (eay@cryptsoft.com)"
	* The word 'cryptographic' can be left out if the rouines from the library
	* being used are not cryptographic related :-).
	* 4. If you include any Windows specific code (or a derivative thereof) from
	* the apps directory (application code) you must include an acknowledgement:
	* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
	*
	* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*
	* The licence and distribution terms for any publically available version or
	* derivative of this code cannot be changed. i.e. this code cannot simply be
	* copied and put under another distribution licence
	* [including the GNU Public Licence.]
	*/
	/* ====================================================================
	* Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	*
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the
	* distribution.
	*
	* 3. All advertising materials mentioning features or use of this
	* software must display the following acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
	*
	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	* endorse or promote products derived from this software without
	* prior written permission. For written permission, please contact
	* openssl-core@openssl.org.
	*
	* 5. Products derived from this software may not be called "OpenSSL"
	* nor may "OpenSSL" appear in their names without prior written
	* permission of the OpenSSL Project.
	*
	* 6. Redistributions of any form whatsoever must retain the following
	* acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
	*
	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
	* OF THE POSSIBILITY OF SUCH DAMAGE.
	* ====================================================================
	*
	* This product includes cryptographic software written by Eric Young
	* (eay@cryptsoft.com). This product includes software written by Tim
	* Hudson (tjh@cryptsoft.com).
	*
	*/

	#include <stdio.h>
	#include "ssl_locl.h"
	#include <openssl/buffer.h>
	#include <openssl/rand.h>
	#include <openssl/objects.h>
	#include <openssl/evp.h>

	static SSL_METHOD *ssl23_get_server_method(int ver);
	int ssl23_get_client_hello(SSL *s);
	static SSL_METHOD *ssl23_get_server_method(int ver)
	{
	#ifndef OPENSSL_NO_SSL2
	if (ver == SSL2_VERSION)
	return(SSLv2_server_method());
	#endif
	if (ver == SSL3_VERSION)
	return(SSLv3_server_method());
	else if (ver == TLS1_VERSION)
	return(TLSv1_server_method());
	else
	return(NULL);
	}

	IMPLEMENT_ssl23_meth_func(SSLv23_server_method,
	ssl23_accept,
	ssl_undefined_function,
	ssl23_get_server_method)

	int ssl23_accept(SSL *s)
	{
	BUF_MEM *buf;
	unsigned long Time=(unsigned long)time(NULL);
	void (cb)(const SSL ssl,int type,int val)=NULL;
	int ret= -1;
	int new_state,state;

	RAND_add(&Time,sizeof(Time),0);
	ERR_clear_error();
	clear_sys_error();

	if (s->info_callback != NULL)
	cb=s->info_callback;
	else if (s->ctx->info_callback != NULL)
	cb=s->ctx->info_callback;

	s->in_handshake++;
	if (!SSL_in_init(s) \|\| SSL_in_before(s)) SSL_clear(s);

	for (;;)
	{
	state=s->state;

	switch(s->state)
	{
	case SSL_ST_BEFORE:
	case SSL_ST_ACCEPT:
	case SSL_ST_BEFORE\|SSL_ST_ACCEPT:
	case SSL_ST_OK\|SSL_ST_ACCEPT:

	s->server=1;
	if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);

	/* s->version=SSL3_VERSION; */
	s->type=SSL_ST_ACCEPT;

	if (s->init_buf == NULL)
	{
	if ((buf=BUF_MEM_new()) == NULL)
	{
	ret= -1;
	goto end;
	}
	if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
	{
	ret= -1;
	goto end;
	}
	s->init_buf=buf;
	}

	ssl3_init_finished_mac(s);

	s->state=SSL23_ST_SR_CLNT_HELLO_A;
	s->ctx->stats.sess_accept++;
	s->init_num=0;
	break;

	case SSL23_ST_SR_CLNT_HELLO_A:
	case SSL23_ST_SR_CLNT_HELLO_B:

	s->shutdown=0;
	ret=ssl23_get_client_hello(s);
	if (ret >= 0) cb=NULL;
	goto end;
	/* break; */

	default:
	SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
	ret= -1;
	goto end;
	/* break; */
	}

	if ((cb != NULL) && (s->state != state))
	{
	new_state=s->state;
	s->state=state;
	cb(s,SSL_CB_ACCEPT_LOOP,1);
	s->state=new_state;
	}
	}
	end:
	s->in_handshake--;
	if (cb != NULL)
	cb(s,SSL_CB_ACCEPT_EXIT,ret);
	return(ret);
	}


	int ssl23_get_client_hello(SSL *s)
	{
	char buf_space[11]; /* Request this many bytes in initial read.
	* We can detect SSL 3.0/TLS 1.0 Client Hellos
	* ('type == 3') correctly only when the following
	* is in a single record, which is not guaranteed by
	* the protocol specification:
	* Byte Content
	* 0 type \
	* 1/2 version > record header
	* 3/4 length /
	* 5 msg_type \
	* 6-8 length > Client Hello message
	* 9/10 client_version /
	*/
	char *buf= &(buf_space[0]);
	unsigned char p,d,d_len,dd;
	unsigned int i;
	unsigned int csl,sil,cl;
	int n=0,j;
	int type=0;
	int v[2];

	if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
	{
	/* read the initial header */
	v[0]=v[1]=0;

	if (!ssl3_setup_buffers(s)) goto err;

	n=ssl23_read_bytes(s, sizeof buf_space);
	if (n != sizeof buf_space) return(n); /* n == -1 \|\| n == 0 */

	p=s->packet;

	memcpy(buf,p,n);

	if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
	{
	/*
	* SSLv2 header
	*/
	if ((p[3] == 0x00) && (p[4] == 0x02))
	{
	v[0]=p[3]; v[1]=p[4];
	/* SSLv2 */
	if (!(s->options & SSL_OP_NO_SSLv2))
	type=1;
	}
	else if (p[3] == SSL3_VERSION_MAJOR)
	{
	v[0]=p[3]; v[1]=p[4];
	/* SSLv3/TLSv1 */
	if (p[4] >= TLS1_VERSION_MINOR)
	{
	if (!(s->options & SSL_OP_NO_TLSv1))
	{
	s->version=TLS1_VERSION;
	/* type=2; / / done later to survive restarts */
	s->state=SSL23_ST_SR_CLNT_HELLO_B;
	}
	else if (!(s->options & SSL_OP_NO_SSLv3))
	{
	s->version=SSL3_VERSION;
	/* type=2; */
	s->state=SSL23_ST_SR_CLNT_HELLO_B;
	}
	else if (!(s->options & SSL_OP_NO_SSLv2))
	{
	type=1;
	}
	}
	else if (!(s->options & SSL_OP_NO_SSLv3))
	{
	s->version=SSL3_VERSION;
	/* type=2; */
	s->state=SSL23_ST_SR_CLNT_HELLO_B;
	}
	else if (!(s->options & SSL_OP_NO_SSLv2))
	type=1;

	}
	}
	else if ((p[0] == SSL3_RT_HANDSHAKE) &&
	(p[1] == SSL3_VERSION_MAJOR) &&
	(p[5] == SSL3_MT_CLIENT_HELLO) &&
	((p[3] == 0 && p[4] < 5 /* silly record length? */)
	\|\| (p[9] == p[1])))
	{
	/*
	* SSLv3 or tls1 header
	*/

	v[0]=p[1]; /* major version (= SSL3_VERSION_MAJOR) */
	/* We must look at client_version inside the Client Hello message
	* to get the correct minor version.
	* However if we have only a pathologically small fragment of the
	* Client Hello message, this would be difficult, and we'd have
	* to read more records to find out.
	* No known SSL 3.0 client fragments ClientHello like this,
	* so we simply assume TLS 1.0 to avoid protocol version downgrade
	* attacks. */
	if (p[3] == 0 && p[4] < 6)
	{
	#if 0
	SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_SMALL);
	goto err;
	#else
	v[1] = TLS1_VERSION_MINOR;
	#endif
	}
	else
	v[1]=p[10]; /* minor version according to client_version */
	if (v[1] >= TLS1_VERSION_MINOR)
	{
	if (!(s->options & SSL_OP_NO_TLSv1))
	{
	s->version=TLS1_VERSION;
	type=3;
	}
	else if (!(s->options & SSL_OP_NO_SSLv3))
	{
	s->version=SSL3_VERSION;
	type=3;
	}
	}
	else
	{
	/* client requests SSL 3.0 */
	if (!(s->options & SSL_OP_NO_SSLv3))
	{
	s->version=SSL3_VERSION;
	type=3;
	}
	else if (!(s->options & SSL_OP_NO_TLSv1))
	{
	/* we won't be able to use TLS of course,
	* but this will send an appropriate alert */
	s->version=TLS1_VERSION;
	type=3;
	}
	}
	}
	else if ((strncmp("GET ", (char *)p,4) == 0) \|\|
	(strncmp("POST ",(char *)p,5) == 0) \|\|
	(strncmp("HEAD ",(char *)p,5) == 0) \|\|
	(strncmp("PUT ", (char *)p,4) == 0))
	{
	SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
	goto err;
	}
	else if (strncmp("CONNECT",(char *)p,7) == 0)
	{
	SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
	goto err;
	}
	}

	#ifdef OPENSSL_FIPS
	if (FIPS_mode() && (s->version < TLS1_VERSION))
	{
	SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
	SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
	goto err;
	}
	#endif

	if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
	{
	/* we have SSLv3/TLSv1 in an SSLv2 header
	* (other cases skip this state) */

	type=2;
	p=s->packet;
	v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
	v[1] = p[4];

	/* The SSL2 protocol allows n to be larger, just pick
	* a reasonable buffer size. */
	#if SSL3_RT_DEFAULT_PACKET_SIZE < 1024*4 - SSL3_RT_DEFAULT_WRITE_OVERHEAD
	#error "SSL3_RT_DEFAULT_PACKET_SIZE is too small."
	#endif
	n=((p[0]&0x7f)<<8)\|p[1];
	if (n > SSL3_RT_DEFAULT_PACKET_SIZE - 2)
	{
	SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
	goto err;
	}

	j=ssl23_read_bytes(s,n+2);
	if (j <= 0) return(j);

	ssl3_finish_mac(s, s->packet+2, s->packet_length-2);
	if (s->msg_callback)
	s->msg_callback(0, SSL2_VERSION, 0, s->packet+2, s->packet_length-2, s, s->msg_callback_arg); /* CLIENT-HELLO */

	p=s->packet;
	p+=5;
	n2s(p,csl);
	n2s(p,sil);
	n2s(p,cl);
	d=(unsigned char *)s->init_buf->data;
	if ((csl+sil+cl+11) != s->packet_length)
	{
	SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
	goto err;
	}

	/* record header: msg_type ... */
	*(d++) = SSL3_MT_CLIENT_HELLO;
	/* ... and length (actual value will be written later) */
	d_len = d;
	d += 3;

	/* client_version */
	(d++) = SSL3_VERSION_MAJOR; / == v[0] */
	*(d++) = v[1];

	/* lets populate the random area */
	/* get the challenge_length */
	i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
	memset(d,0,SSL3_RANDOM_SIZE);
	memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
	d+=SSL3_RANDOM_SIZE;

	/* no session-id reuse */
	*(d++)=0;

	/* ciphers */
	j=0;
	dd=d;
	d+=2;
	for (i=0; i<csl; i+=3)
	{
	if (p[i] != 0) continue;
	*(d++)=p[i+1];
	*(d++)=p[i+2];
	j+=2;
	}
	s2n(j,dd);

	/* COMPRESSION */
	*(d++)=1;
	*(d++)=0;

	i = (d-(unsigned char *)s->init_buf->data) - 4;
	l2n3((long)i, d_len);

	/* get the data reused from the init_buf */
	s->s3->tmp.reuse_message=1;
	s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
	s->s3->tmp.message_size=i;
	}

	/* imaginary new state (for program structure): */
	/* s->state = SSL23_SR_CLNT_HELLO_C */

	if (type == 1)
	{
	#ifdef OPENSSL_NO_SSL2
	SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
	goto err;
	#else
	/* 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);
	return(SSL_accept(s));
	err:
	if (buf != buf_space) OPENSSL_free(buf);
	return(-1);
	}