/* 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).

  *

  */

 /*

  © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

  */

 #include <stdio.h>

 #include "ssl_locl.h"

 #include <openssl/buffer.h>

 #include <openssl/rand.h>

 #include <openssl/objects.h>

 #include <openssl/evp.h>

 #if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))

 #include "libssl_wsd.h"

 #endif

 #ifdef EMULATOR

 	GET_STATIC_VAR_FROM_TLS(SSLv23_server_method_data,s23_srvr,SSL_METHOD)

 	#define SSLv23_server_method_data (*GET_WSD_VAR_NAME(SSLv23_server_method_data,s23_srvr,s)())

 #endif

 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);

 	}

 EXPORT_C 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;

 			}

 		}

 	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];

 		n=((p[0]&0x7f)<<8)|p[1];

 		if (n > (1024*4))

 			{

 			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);

 	}