/* 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;

 		}

 	s->session->master_key_length=i;

 	memcpy(s->session->master_key,p,(unsigned int)i);

 	return(1);

 	}

 static int get_client_hello(SSL *s)

 	{

 	int i,n;

 	unsigned long len;

 	unsigned char *p;

 	STACK_OF(SSL_CIPHER) *cs; /* a stack of SSL_CIPHERS */

 	STACK_OF(SSL_CIPHER) *cl; /* the ones we want to use */

 	STACK_OF(SSL_CIPHER) *prio, *allow;

 	int z;

 	/* This is a bit of a hack to check for the correct packet

 	 * type the first time round. */

 	if (s->state == SSL2_ST_GET_CLIENT_HELLO_A)

 		{

 		s->first_packet=1;

 		s->state=SSL2_ST_GET_CLIENT_HELLO_B;

 		}

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

 	if (s->state == SSL2_ST_GET_CLIENT_HELLO_B)

 		{

 		i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num);

 		if (i < (9-s->init_num)) 

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

 		s->init_num = 9;

 		if (*(p++) != SSL2_MT_CLIENT_HELLO)

 			{

 			if (p[-1] != SSL2_MT_ERROR)

 				{

 				ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

 				SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE);

 				}

 			else

 				SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR);

 			return(-1);

 			}

 		n2s(p,i);

 		if (i < s->version) s->version=i;

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

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

 		n2s(p,i); s->s2->challenge_length=i;

 		if (	(i < SSL2_MIN_CHALLENGE_LENGTH) ||

 			(i > SSL2_MAX_CHALLENGE_LENGTH))

 			{

 			ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

 			SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH);

 			return(-1);

 			}

 		s->state=SSL2_ST_GET_CLIENT_HELLO_C;

 		}

 	/* SSL2_ST_GET_CLIENT_HELLO_C */

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

 	len = 9 + (unsigned long)s->s2->tmp.cipher_spec_length + (unsigned long)s->s2->challenge_length + (unsigned long)s->s2->tmp.session_id_length;

 	if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)

 		{

 		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

 		SSLerr(SSL_F_GET_CLIENT_HELLO,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_HELLO,i));

 	if (s->msg_callback)

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

 	p += 9;

 	/* get session-id before cipher stuff so we can get out session

 	 * structure if it is cached */

 	/* session-id */

 	if ((s->s2->tmp.session_id_length != 0) && 

 		(s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH))

 		{

 		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

 		SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH);

 		return(-1);

 		}

 	if (s->s2->tmp.session_id_length == 0)

 		{

 		if (!ssl_get_new_session(s,1))

 			{

 			ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

 			return(-1);

 			}

 		}

 	else

 		{

 		i=ssl_get_prev_session(s,&(p[s->s2->tmp.cipher_spec_length]),

 			s->s2->tmp.session_id_length, NULL);

 		if (i == 1)

 			{ /* previous session */

 			s->hit=1;

 			}

 		else if (i == -1)

 			{

 			ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

 			return(-1);

 			}

 		else

 			{

 			if (s->cert == NULL)

 				{

 				ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);

 				SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICATE_SET);

 				return(-1);

 				}

 			if (!ssl_get_new_session(s,1))

 				{

 				ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

 				return(-1);

 				}

 			}

 		}

 	if (!s->hit)

 		{

 		cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length,

 			&s->session->ciphers);

 		if (cs == NULL) goto mem_err;

 		cl=SSL_get_ciphers(s);

 		if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)

 		    {

 		    prio=sk_SSL_CIPHER_dup(cl);

 		    if (prio == NULL) goto mem_err;

 		    allow = cs;

 		    }

 		else

 		    {

 		    prio = cs;

 		    allow = cl;

 		    }

 		for (z=0; z<sk_SSL_CIPHER_num(prio); z++)

 			{

 			if (sk_SSL_CIPHER_find(allow,sk_SSL_CIPHER_value(prio,z)) < 0)

 				{

 				(void)sk_SSL_CIPHER_delete(prio,z);

 				z--;

 				}

 			}

 		if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)

 		    {

 		    sk_SSL_CIPHER_free(s->session->ciphers);

 		    s->session->ciphers = prio;

 		    }

 		/* s->session->ciphers should now have a list of

 		 * ciphers that are on both the client and server.

 		 * This list is ordered by the order the client sent

 		 * the ciphers or in the order of the server's preference

 		 * if SSL_OP_CIPHER_SERVER_PREFERENCE was set.

 		 */

 		}

 	p+=s->s2->tmp.cipher_spec_length;

 	/* done cipher selection */

 	/* session id extracted already */

 	p+=s->s2->tmp.session_id_length;

 	/* challenge */

 	if (s->s2->challenge_length > sizeof s->s2->challenge)

 		{

 		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

 		SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);

 		return -1;

 		}

 	memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length);

 	return(1);

 mem_err:

 	SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);

 	return(0);

 	}

 static int server_hello(SSL *s)

 	{

 	unsigned char *p,*d;

 	int n,hit;

 	STACK_OF(SSL_CIPHER) *sk;

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

 	if (s->state == SSL2_ST_SEND_SERVER_HELLO_A)

 		{

 		d=p+11;

 		*(p++)=SSL2_MT_SERVER_HELLO;		/* type */

 		hit=s->hit;

 		*(p++)=(unsigned char)hit;

 #if 1

 		if (!hit)

 			{

 			if (s->session->sess_cert != NULL)

 				/* This can't really happen because get_client_hello

 				 * has called ssl_get_new_session, which does not set

 				 * sess_cert. */

 				ssl_sess_cert_free(s->session->sess_cert);

 			s->session->sess_cert = ssl_sess_cert_new();

 			if (s->session->sess_cert == NULL)

 				{

 				SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE);

 				return(-1);

 				}

 			}

 		/* If 'hit' is set, then s->sess_cert may be non-NULL or NULL,

 		 * depending on whether it survived in the internal cache

 		 * or was retrieved from an external cache.

 		 * If it is NULL, we cannot put any useful data in it anyway,

 		 * so we don't touch it.

 		 */

 #else /* That's what used to be done when cert_st and sess_cert_st were

 	   * the same. */

 		if (!hit)

 			{			/* else add cert to session */

 			CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);

 			if (s->session->sess_cert != NULL)

 				ssl_cert_free(s->session->sess_cert);

 			s->session->sess_cert=s->cert;		

 			}

 		else	/* We have a session id-cache hit, if the

 			 * session-id has no certificate listed against

 			 * the 'cert' structure, grab the 'old' one

 			 * listed against the SSL connection */

 			{

 			if (s->session->sess_cert == NULL)

 				{

 				CRYPTO_add(&s->cert->references,1,

 					CRYPTO_LOCK_SSL_CERT);

 				s->session->sess_cert=s->cert;

 				}

 			}

 #endif

 		if (s->cert == NULL)

 			{

 			ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);

 			SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED);

 			return(-1);

 			}

 		if (hit)

 			{

 			*(p++)=0;		/* no certificate type */

 			s2n(s->version,p);	/* version */

 			s2n(0,p);		/* cert len */

 			s2n(0,p);		/* ciphers len */

 			}

 		else

 			{

 			/* EAY EAY */

 			/* put certificate type */

 			*(p++)=SSL2_CT_X509_CERTIFICATE;

 			s2n(s->version,p);	/* version */

 			n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);

 			s2n(n,p);		/* certificate length */

 			i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d);

 			n=0;

 			/* lets send out the ciphers we like in the

 			 * prefered order */

 			sk= s->session->ciphers;

 			n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d,0);

 			d+=n;

 			s2n(n,p);		/* add cipher length */

 			}

 		/* make and send conn_id */

 		s2n(SSL2_CONNECTION_ID_LENGTH,p);	/* add conn_id length */

 		s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH;

 		if (RAND_pseudo_bytes(s->s2->conn_id,(int)s->s2->conn_id_length) <= 0)

 			return -1;

 		memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH);

 		d+=SSL2_CONNECTION_ID_LENGTH;

 		s->state=SSL2_ST_SEND_SERVER_HELLO_B;

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

 		s->init_off=0;

 		}

 	/* SSL2_ST_SEND_SERVER_HELLO_B */

  	/* If we are using TCP/IP, the performance is bad if we do 2

  	 * writes without a read between them.  This occurs when

  	 * Session-id reuse is used, so I will put in a buffering module

  	 */

  	if (s->hit)

  		{

 		if (!ssl_init_wbio_buffer(s,1)) return(-1);

  		}

 	return(ssl2_do_write(s));

 	}

 static int get_client_finished(SSL *s)

 	{

 	unsigned char *p;

 	int i, n;

 	unsigned long len;

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

 	if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A)

 		{

 		i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);

 		if (i < 1-s->init_num)

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

 		s->init_num += i;

 		if (*p != SSL2_MT_CLIENT_FINISHED)

 			{

 			if (*p != SSL2_MT_ERROR)

 				{

 				ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

 				SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);

 				}

 			else

 				{

 				SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR);

 				/* try to read the error message */

 				i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);

 				return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);

 				}

 			return(-1);

 			}

 		s->state=SSL2_ST_GET_CLIENT_FINISHED_B;

 		}

 	/* SSL2_ST_GET_CLIENT_FINISHED_B */

 	if (s->s2->conn_id_length > sizeof s->s2->conn_id)

 		{

 		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

 		SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);

 		return -1;

 		}

 	len = 1 + (unsigned long)s->s2->conn_id_length;

 	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_FINISHED,i));

 		}

 	if (s->msg_callback)

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

 	p += 1;

 	if (memcmp(p,s->s2->conn_id,s->s2->conn_id_length) != 0)

 		{

 		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

 		SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT);

 		return(-1);

 		}

 	return(1);

 	}

 static int server_verify(SSL *s)

 	{

 	unsigned char *p;

 	if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)

 		{

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

 		*(p++)=SSL2_MT_SERVER_VERIFY;

 		if (s->s2->challenge_length > sizeof s->s2->challenge)

 			{

 			SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR);

 			return -1;

 			}

 		memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length);

 		/* p+=s->s2->challenge_length; */

 		s->state=SSL2_ST_SEND_SERVER_VERIFY_B;

 		s->init_num=s->s2->challenge_length+1;

 		s->init_off=0;

 		}

 	return(ssl2_do_write(s));

 	}

 static int server_finish(SSL *s)

 	{

 	unsigned char *p;

 	if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)

 		{

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

 		*(p++)=SSL2_MT_SERVER_FINISHED;

 		if (s->session->session_id_length > sizeof s->session->session_id)

 			{

 			SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR);

 			return -1;

 			}

 		memcpy(p,s->session->session_id, (unsigned int)s->session->session_id_length);

 		/* p+=s->session->session_id_length; */

 		s->state=SSL2_ST_SEND_SERVER_FINISHED_B;

 		s->init_num=s->session->session_id_length+1;

 		s->init_off=0;

 		}

 	/* SSL2_ST_SEND_SERVER_FINISHED_B */

 	return(ssl2_do_write(s));

 	}

 /* send the request and check the response */

 static int request_certificate(SSL *s)

 	{

 	const unsigned char *cp;

 	unsigned char *p,*p2,*buf2;

 	unsigned char *ccd;

 	int i,j,ctype,ret= -1;

 	unsigned long len;

 	X509 *x509=NULL;

 	STACK_OF(X509) *sk=NULL;

 	ccd=s->s2->tmp.ccl;

 	if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)

 		{

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

 		*(p++)=SSL2_MT_REQUEST_CERTIFICATE;

 		*(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;

 		if (RAND_pseudo_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH) <= 0)

 			return -1;

 		memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);

 		s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;

 		s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;

 		s->init_off=0;

 		}

 	if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)

 		{

 		i=ssl2_do_write(s);

 		if (i <= 0)

 			{

 			ret=i;

 			goto end;

 			}

 		s->init_num=0;

 		s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;

 		}

 	if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)

 		{

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

 		i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num); /* try to read 6 octets ... */

 		if (i < 3-s->init_num) /* ... but don't call ssl2_part_read now if we got at least 3

 		                        * (probably NO-CERTIFICATE-ERROR) */

 			{

 			ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);

 			goto end;

 			}

 		s->init_num += i;

 		if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR))

 			{

 			n2s(p,i);

 			if (i != SSL2_PE_NO_CERTIFICATE)

 				{

 				/* not the error message we expected -- let ssl2_part_read handle it */

 				s->init_num -= 3;

 				ret = ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE, 3);

 				goto end;

 				}

 			if (s->msg_callback)

 				s->msg_callback(0, s->version, 0, p, 3, s, s->msg_callback_arg); /* ERROR */

 			/* this is the one place where we can recover from an SSL 2.0 error */

 			if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)

 				{

 				ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);

 				SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);

 				goto end;

 				}

 			ret=1;

 			goto end;

 			}

 		if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (s->init_num < 6))

 			{

 			ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

 			SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);

 			goto end;

 			}

 		if (s->init_num != 6)

 			{

 			SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR);

 			goto end;

 			}

 		/* ok we have a response */

 		/* certificate type, there is only one right now. */

 		ctype= *(p++);

 		if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)

 			{

 			ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);

 			SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT);

 			goto end;

 			}

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

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

 		s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;

 		}

 	/* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */

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

 	len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rlen;

 	if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)

 		{

 		SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_MESSAGE_TOO_LONG);

 		goto end;

 		}

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

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

 	if (i < j) 

 		{

 		ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);

 		goto end;

 		}

 	if (s->msg_callback)

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

 	p += 6;

 	cp = p;

 	x509=(X509 *)d2i_X509(NULL,&cp,(long)s->s2->tmp.clen);

 	if (x509 == NULL)

 		{

 		SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);

 		goto msg_end;

 		}

 	if (((sk=sk_X509_new_null()) == NULL) || (!sk_X509_push(sk,x509)))

 		{

 		SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);

 		goto msg_end;

 		}

 	i=ssl_verify_cert_chain(s,sk);

 	if (i)	/* we like the packet, now check the chksum */

 		{

 		EVP_MD_CTX ctx;

 		EVP_PKEY *pkey=NULL;

 		EVP_MD_CTX_init(&ctx);

 		EVP_VerifyInit_ex(&ctx,s->ctx->rsa_md5, NULL);

 		EVP_VerifyUpdate(&ctx,s->s2->key_material,

 				 s->s2->key_material_length);

 		EVP_VerifyUpdate(&ctx,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);

 		i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);

 		buf2=OPENSSL_malloc((unsigned int)i);

 		if (buf2 == NULL)

 			{

 			SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);

 			goto msg_end;

 			}

 		p2=buf2;

 		i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2);

 		EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i);

 		OPENSSL_free(buf2);

 		pkey=X509_get_pubkey(x509);

 		if (pkey == NULL) goto end;

 		i=EVP_VerifyFinal(&ctx,cp,s->s2->tmp.rlen,pkey);

 		EVP_PKEY_free(pkey);

 		EVP_MD_CTX_cleanup(&ctx);

 		if (i) 

 			{

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

 				X509_free(s->session->peer);

 			s->session->peer=x509;

 			CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);

 			s->session->verify_result = s->verify_result;

 			ret=1;

 			goto end;

 			}

 		else

 			{

 			SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM);

 			goto msg_end;

 			}

 		}

 	else

 		{

 msg_end:

 		ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);

 		}

 end:

 	sk_X509_free(sk);

 	X509_free(x509);

 	return(ret);

 	}

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

 	     unsigned char *to, int padding)

 	{

 	RSA *rsa;

 	int i;

 	if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL))

 		{

 		SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY);

 		return(-1);

 		}

 	if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA)

 		{

 		SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);

 		return(-1);

 		}

 	rsa=c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;

 	/* we have the public key */

 	i=RSA_private_decrypt(len,from,to,rsa,padding);

 	if (i < 0)

 		SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB);

 	return(i);

 	}

 #else /* !OPENSSL_NO_SSL2 */

 # if PEDANTIC

 static void *dummy=&dummy;

 # endif

 #endif