/* ssl/s2_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 "ssl_locl.h"

#ifndef OPENSSL_NO_SSL2

#include <stdio.h>

#include <openssl/bio.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(SSLv2_server_method_data,s2_srvr,SSL_METHOD)

	#define SSLv2_server_method_data (*GET_WSD_VAR_NAME(SSLv2_server_method_data,s2_srvr,s)())

#endif

static SSL_METHOD *ssl2_get_server_method(int ver);

static int get_client_master_key(SSL *s);

static int get_client_hello(SSL *s);

static int server_hello(SSL *s); 

static int get_client_finished(SSL *s);

static int server_verify(SSL *s);

static int server_finish(SSL *s);

static int request_certificate(SSL *s);

static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,

	unsigned char *to,int padding);

#define BREAK	break

static SSL_METHOD *ssl2_get_server_method(int ver)

	{

	if (ver == SSL2_VERSION)

		return(SSLv2_server_method());

	else

		return(NULL);

	}

EXPORT_C IMPLEMENT_ssl2_meth_func(SSLv2_server_method,

			ssl2_accept,

			ssl_undefined_function,

			ssl2_get_server_method)

int ssl2_accept(SSL *s)

	{

	unsigned long l=(unsigned long)time(NULL);

	BUF_MEM *buf=NULL;

	int ret= -1;

	long num1;

	void (*cb)(const SSL *ssl,int type,int val)=NULL;

	int new_state,state;

	RAND_add(&l,sizeof(l),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;

	/* init things to blank */

	s->in_handshake++;

	if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);

	if (s->cert == NULL)

		{

		SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_NO_CERTIFICATE_SET);

		return(-1);

		}

	clear_sys_error();

	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=SSL2_VERSION;

			s->type=SSL_ST_ACCEPT;

			buf=s->init_buf;

			if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))

				{ ret= -1; goto end; }

			if (!BUF_MEM_grow(buf,(int)

				SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))

				{ ret= -1; goto end; }

			s->init_buf=buf;

			s->init_num=0;

			s->ctx->stats.sess_accept++;

			s->handshake_func=ssl2_accept;

			s->state=SSL2_ST_GET_CLIENT_HELLO_A;

			BREAK;

		case SSL2_ST_GET_CLIENT_HELLO_A:

		case SSL2_ST_GET_CLIENT_HELLO_B:

		case SSL2_ST_GET_CLIENT_HELLO_C:

			s->shutdown=0;

			ret=get_client_hello(s);

			if (ret <= 0) goto end;

			s->init_num=0;

			s->state=SSL2_ST_SEND_SERVER_HELLO_A;

			BREAK;

		case SSL2_ST_SEND_SERVER_HELLO_A:

		case SSL2_ST_SEND_SERVER_HELLO_B:

			ret=server_hello(s);

			if (ret <= 0) goto end;

			s->init_num=0;

			if (!s->hit)

				{

				s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_A;

				BREAK;

				}

			else

				{

				s->state=SSL2_ST_SERVER_START_ENCRYPTION;

				BREAK;

				}

		case SSL2_ST_GET_CLIENT_MASTER_KEY_A:

		case SSL2_ST_GET_CLIENT_MASTER_KEY_B:

			ret=get_client_master_key(s);

			if (ret <= 0) goto end;

			s->init_num=0;

			s->state=SSL2_ST_SERVER_START_ENCRYPTION;

			BREAK;

		case SSL2_ST_SERVER_START_ENCRYPTION:

			/* Ok we how have sent all the stuff needed to

			 * start encrypting, the next packet back will

			 * be encrypted. */

			if (!ssl2_enc_init(s,0))

				{ ret= -1; goto end; }

			s->s2->clear_text=0;

			s->state=SSL2_ST_SEND_SERVER_VERIFY_A;

			BREAK;

		case SSL2_ST_SEND_SERVER_VERIFY_A:

		case SSL2_ST_SEND_SERVER_VERIFY_B:

			ret=server_verify(s);

			if (ret <= 0) goto end;

			s->init_num=0;

			if (s->hit)

				{

				/* If we are in here, we have been

				 * buffering the output, so we need to

				 * flush it and remove buffering from

				 * future traffic */

				s->state=SSL2_ST_SEND_SERVER_VERIFY_C;

				BREAK;

				}

			else

				{

				s->state=SSL2_ST_GET_CLIENT_FINISHED_A;

				break;

				}

 		case SSL2_ST_SEND_SERVER_VERIFY_C:

 			/* get the number of bytes to write */

 			num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);

 			if (num1 != 0)

 				{

				s->rwstate=SSL_WRITING;

 				num1=BIO_flush(s->wbio);

 				if (num1 <= 0) { ret= -1; goto end; }

				s->rwstate=SSL_NOTHING;

				}

 			/* flushed and now remove buffering */

 			s->wbio=BIO_pop(s->wbio);

 			s->state=SSL2_ST_GET_CLIENT_FINISHED_A;

  			BREAK;

		case SSL2_ST_GET_CLIENT_FINISHED_A:

		case SSL2_ST_GET_CLIENT_FINISHED_B:

			ret=get_client_finished(s);

			if (ret <= 0)

				goto end;

			s->init_num=0;

			s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_A;

			BREAK;

		case SSL2_ST_SEND_REQUEST_CERTIFICATE_A:

		case SSL2_ST_SEND_REQUEST_CERTIFICATE_B:

		case SSL2_ST_SEND_REQUEST_CERTIFICATE_C:

		case SSL2_ST_SEND_REQUEST_CERTIFICATE_D:

			/* don't do a 'request certificate' if we

			 * don't want to, or we already have one, and

			 * we only want to do it once. */

			if (!(s->verify_mode & SSL_VERIFY_PEER) ||

				((s->session->peer != NULL) &&

				(s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))

				{

				s->state=SSL2_ST_SEND_SERVER_FINISHED_A;

				break;

				}

			else

				{

				ret=request_certificate(s);

				if (ret <= 0) goto end;

				s->init_num=0;

				s->state=SSL2_ST_SEND_SERVER_FINISHED_A;

				}

			BREAK;

		case SSL2_ST_SEND_SERVER_FINISHED_A:

		case SSL2_ST_SEND_SERVER_FINISHED_B:

			ret=server_finish(s);

			if (ret <= 0) goto end;

			s->init_num=0;

			s->state=SSL_ST_OK;

			break;

		case SSL_ST_OK:

			BUF_MEM_free(s->init_buf);

			ssl_free_wbio_buffer(s);

			s->init_buf=NULL;

			s->init_num=0;

		/*	ERR_clear_error();*/

			ssl_update_cache(s,SSL_SESS_CACHE_SERVER);

			s->ctx->stats.sess_accept_good++;

			/* s->server=1; */

			ret=1;

			if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);

			goto end;

			/* BREAK; */

		default:

			SSLerr(SSL_F_SSL2_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);

	}

static int get_client_master_key(SSL *s)

	{

	int is_export,i,n,keya,ek;

	unsigned long len;

	unsigned char *p;

	SSL_CIPHER *cp;

	const EVP_CIPHER *c;

	const EVP_MD *md;

	p=(unsigned char *)s->init_buf->data;

	if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A)

		{

		i=ssl2_read(s,(char *)&(p[s->init_num]),10-s->init_num);

		if (i < (10-s->init_num))

			return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));

		s->init_num = 10;

		if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY)

			{

			if (p[-1] != SSL2_MT_ERROR)

				{

				ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

				SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WRONG_PACKET_TYPE);

				}

			else

				SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_PEER_ERROR);

			return(-1);

			}

		cp=ssl2_get_cipher_by_char(p);

		if (cp == NULL)

			{

			ssl2_return_error(s,SSL2_PE_NO_CIPHER);

			SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_CIPHER_MATCH);

			return(-1);

			}

		s->session->cipher= cp;

		p+=3;

		n2s(p,i); s->s2->tmp.clear=i;

		n2s(p,i); s->s2->tmp.enc=i;

		n2s(p,i); s->session->key_arg_length=i;

		if(s->session->key_arg_length > SSL_MAX_KEY_ARG_LENGTH)

			{

			ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

			SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_KEY_ARG_TOO_LONG);

			return -1;

			}

		s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B;

		}

	/* SSL2_ST_GET_CLIENT_MASTER_KEY_B */

	p=(unsigned char *)s->init_buf->data;

	if (s->init_buf->length < SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)

		{

		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

		SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);

		return -1;

		}

	keya=s->session->key_arg_length;

	len = 10 + (unsigned long)s->s2->tmp.clear + (unsigned long)s->s2->tmp.enc + (unsigned long)keya;

	if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)

		{

		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

		SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_MESSAGE_TOO_LONG);

		return -1;

		}

	n = (int)len - s->init_num;

	i = ssl2_read(s,(char *)&(p[s->init_num]),n);

	if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));

	if (s->msg_callback)

		s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-MASTER-KEY */

	p += 10;

	memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]),

		(unsigned int)keya);

	if (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)

		{

		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

		SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);

		return(-1);

		}

	i=ssl_rsa_private_decrypt(s->cert,s->s2->tmp.enc,

		&(p[s->s2->tmp.clear]),&(p[s->s2->tmp.clear]),

		(s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);

	is_export=SSL_C_IS_EXPORT(s->session->cipher);

	if (!ssl_cipher_get_evp(s->session,&c,&md,NULL))

		{

		ssl2_return_error(s,SSL2_PE_NO_CIPHER);

		SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);

		return(0);

		}

	if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)

		{

		is_export=1;

		ek=8;

		}

	else

		ek=5;

	/* bad decrypt */

#if 1

	/* If a bad decrypt, continue with protocol but with a

	 * random master secret (Bleichenbacher attack) */

	if ((i < 0) ||

		((!is_export && (i != EVP_CIPHER_key_length(c)))

		|| (is_export && ((i != ek) || (s->s2->tmp.clear+(unsigned int)i !=

			(unsigned int)EVP_CIPHER_key_length(c))))))

		{

		ERR_clear_error();

		if (is_export)

			i=ek;

		else

			i=EVP_CIPHER_key_length(c);

		if (RAND_pseudo_bytes(p,i) <= 0)

			return 0;

		}

#else

	if (i < 0)

		{

		error=1;

		SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT);

		}

	/* incorrect number of key bytes for non export cipher */

	else if ((!is_export && (i != EVP_CIPHER_key_length(c)))

		|| (is_export && ((i != ek) || (s->s2->tmp.clear+i !=

			EVP_CIPHER_key_length(c)))))

		{

		error=1;

		SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS);

		}

	if (error)

		{

		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

		return(-1);

		}

#endif

	if (is_export) i+=s->s2->tmp.clear;

	if (i > SSL_MAX_MASTER_KEY_LENGTH)

		{

		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

		SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);

		return -1;

		}