/* 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);

	}