ssl/s23_clnt.c - boringssl - Git at Google

 /* 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) 1998-2006 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 <openssl/buf.h>
 #include <openssl/err.h>
 #include <openssl/evp.h>
 #include <openssl/obj.h>
 #include <openssl/rand.h>

 #include "ssl_locl.h"

 static const SSL_METHOD *ssl23_get_client_method(int ver);
 static int ssl23_client_hello(SSL *s);
 static int ssl23_get_server_hello(SSL *s);
 static const SSL_METHOD *ssl23_get_client_method(int ver)
 	{
 	if (ver == SSL3_VERSION)
 		return(SSLv3_client_method());
 	else if (ver == TLS1_VERSION)
 		return(TLSv1_client_method());
 	else if (ver == TLS1_1_VERSION)
 		return(TLSv1_1_client_method());
 	else if (ver == TLS1_2_VERSION)
 		return(TLSv1_2_client_method());
 	else
 		return(NULL);
 	}

 IMPLEMENT_ssl23_meth_func(SSLv23_client_method,
 			ssl_undefined_function,
 			ssl23_connect,
 			ssl23_get_client_method)

 int ssl23_connect(SSL *s)
 	{
 	BUF_MEM *buf=NULL;
 	void (*cb)(const SSL *ssl,int type,int val)=NULL;
 	int ret= -1;
 	int new_state,state;

 	ERR_clear_error();
 	ERR_clear_system_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_CONNECT:
 		case SSL_ST_BEFORE|SSL_ST_CONNECT:
 		case SSL_ST_OK|SSL_ST_CONNECT:

 			if (s->session != NULL)
 				{
 				OPENSSL_PUT_ERROR(SSL, ssl23_connect, SSL_R_SSL23_DOING_SESSION_ID_REUSE);
 				ret= -1;
 				goto end;
 				}
 			s->server=0;
 			if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);

 			/* s->version=TLS1_VERSION; */
 			s->type=SSL_ST_CONNECT;

 			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;
 				buf=NULL;
 				}

 			if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }

 			ssl3_init_finished_mac(s);

 			s->state=SSL23_ST_CW_CLNT_HELLO_A;
 			s->ctx->stats.sess_connect++;
 			s->init_num=0;
 			break;

 		case SSL23_ST_CW_CLNT_HELLO_A:
 		case SSL23_ST_CW_CLNT_HELLO_B:

 			s->shutdown=0;
 			ret=ssl23_client_hello(s);
 			if (ret <= 0) goto end;
 			s->state=SSL23_ST_CR_SRVR_HELLO_A;
 			s->init_num=0;

 			break;

 		case SSL23_ST_CR_SRVR_HELLO_A:
 		case SSL23_ST_CR_SRVR_HELLO_B:
 			ret=ssl23_get_server_hello(s);
 			if (ret >= 0) cb=NULL;
 			goto end;
 			/* break; */

 		default:
 			OPENSSL_PUT_ERROR(SSL, ssl23_connect, SSL_R_UNKNOWN_STATE);
 			ret= -1;
 			goto end;
 			/* break; */
 			}

 		if (s->debug) { (void)BIO_flush(s->wbio); }

 		if ((cb != NULL) && (s->state != state))
 			{
 			new_state=s->state;
 			s->state=state;
 			cb(s,SSL_CB_CONNECT_LOOP,1);
 			s->state=new_state;
 			}
 		}
 end:
 	s->in_handshake--;
 	if (buf != NULL)
 		BUF_MEM_free(buf);
 	if (cb != NULL)
 		cb(s,SSL_CB_CONNECT_EXIT,ret);
 	return(ret);
 	}

 static int ssl23_no_ssl2_ciphers(SSL *s)
 	{
 	SSL_CIPHER *cipher;
 	STACK_OF(SSL_CIPHER) *ciphers;
 	int i;
 	ciphers = SSL_get_ciphers(s);
 	for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++)
 		{
 		cipher = sk_SSL_CIPHER_value(ciphers, i);
 		if (cipher->algorithm_ssl == SSL_SSLV2)
 			return 0;
 		}
 	return 1;
 	}

 /* Fill a ClientRandom or ServerRandom field of length len. Returns <= 0
  * on failure, 1 on success. */
 int ssl_fill_hello_random(SSL *s, int server, unsigned char *result, int len)
 	{
 		int send_time = 0;
 		if (len < 4)
 			return 0;
 		if (server)
 			send_time = (s->mode & SSL_MODE_SEND_SERVERHELLO_TIME) != 0;
 		else
 			send_time = (s->mode & SSL_MODE_SEND_CLIENTHELLO_TIME) != 0;
 		if (send_time)
 			{
 			unsigned long Time = (unsigned long)time(NULL);
 			unsigned char *p = result;
 			l2n(Time, p);
 			return RAND_pseudo_bytes(p, len-4);
 			}
 		else
 			return RAND_pseudo_bytes(result, len);
 	}

 static int ssl23_client_hello(SSL *s)
 	{
 	unsigned char *buf;
 	unsigned char *p,*d;
 	int i,ch_len;
 	unsigned long l;
 	int ssl2_compat;
 	int version = 0, version_major, version_minor;
 	int ret;
 	unsigned long mask, options = s->options;

 	ssl2_compat = (options & SSL_OP_NO_SSLv2) ? 0 : 1;

 	if (ssl2_compat && ssl23_no_ssl2_ciphers(s))
 		ssl2_compat = 0;

 	/*
 	 * SSL_OP_NO_X disables all protocols above X *if* there are
 	 * some protocols below X enabled. This is required in order
 	 * to maintain "version capability" vector contiguous. So
 	 * that if application wants to disable TLS1.0 in favour of
 	 * TLS1>=1, it would be insufficient to pass SSL_NO_TLSv1, the
 	 * answer is SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2.
 	 */
 	mask =	SSL_OP_NO_TLSv1_1|SSL_OP_NO_TLSv1
 #if !defined(OPENSSL_NO_SSL3)
 		|SSL_OP_NO_SSLv3
 #endif
 		;
 #if !defined(OPENSSL_NO_TLS1_2_CLIENT)
 	version = TLS1_2_VERSION;

 	if ((options & SSL_OP_NO_TLSv1_2) && (options & mask) != mask)
 		version = TLS1_1_VERSION;
 #else
 	version = TLS1_1_VERSION;
 #endif
 	mask &= ~SSL_OP_NO_TLSv1_1;
 	if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask)
 		version = TLS1_VERSION;
 	mask &= ~SSL_OP_NO_TLSv1;
 #if !defined(OPENSSL_NO_SSL3)
 	if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask)
 		version = SSL3_VERSION;
 	mask &= ~SSL_OP_NO_SSLv3;
 #endif

 #ifndef OPENSSL_NO_TLSEXT
 	if (version != SSL2_VERSION)
 		{
 		/* have to disable SSL 2.0 compatibility if we need TLS extensions */

 		if (s->tlsext_hostname != NULL)
 			ssl2_compat = 0;
 		if (s->tlsext_status_type != -1)
 			ssl2_compat = 0;
 #ifdef TLSEXT_TYPE_opaque_prf_input
 		if (s->ctx->tlsext_opaque_prf_input_callback != 0 || s->tlsext_opaque_prf_input != NULL)
 			ssl2_compat = 0;
 #endif
 		if (s->ctx->tlsext_authz_server_audit_proof_cb != NULL)
 			ssl2_compat = 0;
 		if (s->ctx->custom_cli_ext_records_count != 0)
 			ssl2_compat = 0;
 		}
 #endif

 	buf=(unsigned char *)s->init_buf->data;
 	if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
 		{
 #if 0
 		/* don't reuse session-id's */
 		if (!ssl_get_new_session(s,0))
 			{
 			return(-1);
 			}
 #endif

 		p=s->s3->client_random;
 		if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0)
 			return -1;

 		if (version == TLS1_2_VERSION)
 			{
 			version_major = TLS1_2_VERSION_MAJOR;
 			version_minor = TLS1_2_VERSION_MINOR;
 			}
 		else if (tls1_suiteb(s))
 			{
 			OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
 			return -1;
 			}
 		else if (version == TLS1_1_VERSION)
 			{
 			version_major = TLS1_1_VERSION_MAJOR;
 			version_minor = TLS1_1_VERSION_MINOR;
 			}
 		else if (version == TLS1_VERSION)
 			{
 			version_major = TLS1_VERSION_MAJOR;
 			version_minor = TLS1_VERSION_MINOR;
 			}
 #ifdef OPENSSL_FIPS
 		else if(FIPS_mode())
 			{
 			OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
 			return -1;
 			}
 #endif
 		else if (version == SSL3_VERSION)
 			{
 			version_major = SSL3_VERSION_MAJOR;
 			version_minor = SSL3_VERSION_MINOR;
 			}
 		else if (version == SSL2_VERSION)
 			{
 			version_major = SSL2_VERSION_MAJOR;
 			version_minor = SSL2_VERSION_MINOR;
 			}
 		else
 			{
 			OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, SSL_R_NO_PROTOCOLS_AVAILABLE);
 			return(-1);
 			}

 		s->client_version = version;

 		if (ssl2_compat)
 			{
 			/* create SSL 2.0 compatible Client Hello */

 			/* two byte record header will be written last */
 			d = &(buf[2]);
 			p = d + 9; /* leave space for message type, version, individual length fields */

 			*(d++) = SSL2_MT_CLIENT_HELLO;
 			*(d++) = version_major;
 			*(d++) = version_minor;

 			/* Ciphers supported */
 			i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0);
 			if (i == 0)
 				{
 				/* no ciphers */
 				OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, SSL_R_NO_CIPHERS_AVAILABLE);
 				return -1;
 				}
 			s2n(i,d);
 			p+=i;

 			/* put in the session-id length (zero since there is no reuse) */
 #if 0
 			s->session->session_id_length=0;
 #endif
 			s2n(0,d);

 			if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 				ch_len=SSL2_CHALLENGE_LENGTH;
 			else
 				ch_len=SSL2_MAX_CHALLENGE_LENGTH;

 			/* write out sslv2 challenge */
 			/* Note that ch_len must be <= SSL3_RANDOM_SIZE (32),
 			   because it is one of SSL2_MAX_CHALLENGE_LENGTH (32)
 			   or SSL2_MAX_CHALLENGE_LENGTH (16), but leave the
 			   check in for futurproofing */
 			if (SSL3_RANDOM_SIZE < ch_len)
 				i=SSL3_RANDOM_SIZE;
 			else
 				i=ch_len;
 			s2n(i,d);
 			memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
 			if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
 				return -1;

 			memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 			p+=i;

 			i= p- &(buf[2]);
 			buf[0]=((i>>8)&0xff)|0x80;
 			buf[1]=(i&0xff);

 			/* number of bytes to write */
 			s->init_num=i+2;
 			s->init_off=0;

 			ssl3_finish_mac(s,&(buf[2]),i);
 			}
 		else
 			{
 			/* create Client Hello in SSL 3.0/TLS 1.0 format */

 			/* do the record header (5 bytes) and handshake message
 			 * header (4 bytes) last. Note: the final argument to
 			 * ssl_add_clienthello_tlsext below depends on the size
 			 * of this prefix. */
 			d = p = &(buf[9]);

 			*(p++) = version_major;
 			*(p++) = version_minor;

 			/* Random stuff */
 			memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
 			p += SSL3_RANDOM_SIZE;

 			/* Session ID (zero since there is no reuse) */
 			*(p++) = 0;

 			/* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
 			i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char);
 			if (i == 0)
 				{
 				OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, SSL_R_NO_CIPHERS_AVAILABLE);
 				return -1;
 				}
 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 			/* Some servers hang if client hello > 256 bytes
 			 * as hack workaround chop number of supported ciphers
 			 * to keep it well below this if we use TLS v1.2
 			 */
 			if (TLS1_get_version(s) >= TLS1_2_VERSION
 				&& i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 				i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 #endif
 			s2n(i,p);
 			p+=i;

 			/* COMPRESSION */
 			*(p++)=1;
 			*(p++)=0; /* Add the NULL method */

 #ifndef OPENSSL_NO_TLSEXT
 			/* TLS extensions*/
 			if (ssl_prepare_clienthello_tlsext(s) <= 0)
 				{
 				OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, SSL_R_CLIENTHELLO_TLSEXT);
 				return -1;
 				}

 			/* The buffer includes the 5 byte record header, so
 			 * subtract it to compute hlen for
 			 * ssl_add_clienthello_tlsext. */
 			if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, p-buf-5)) == NULL)
 				{
 				OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, ERR_R_INTERNAL_ERROR);
 				return -1;
 				}
 #endif

 			l = p-d;

 			/* fill in 4-byte handshake header */
 			d=&(buf[5]);
 			*(d++)=SSL3_MT_CLIENT_HELLO;
 			l2n3(l,d);

 			l += 4;

 			if (l > SSL3_RT_MAX_PLAIN_LENGTH)
 				{
 				OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, ERR_R_INTERNAL_ERROR);
 				return -1;
 				}

 			/* fill in 5-byte record header */
 			d=buf;
 			*(d++) = SSL3_RT_HANDSHAKE;
 			*(d++) = version_major;
 			/* Some servers hang if we use long client hellos
 			 * and a record number > TLS 1.0.
 			 */
 			if (TLS1_get_client_version(s) > TLS1_VERSION)
 				*(d++) = 1;
 			else
 				*(d++) = version_minor;
 			s2n((int)l,d);

 			/* number of bytes to write */
 			s->init_num=p-buf;
 			s->init_off=0;

 			ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
 			}

 		s->state=SSL23_ST_CW_CLNT_HELLO_B;
 		s->init_off=0;
 		}

 	/* SSL3_ST_CW_CLNT_HELLO_B */
 	ret = ssl23_write_bytes(s);

 	if ((ret >= 2) && s->msg_callback)
 		{
 		/* Client Hello has been sent; tell msg_callback */

 		if (ssl2_compat)
 			s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
 		else
 			{
 			s->msg_callback(1, version, SSL3_RT_HEADER, s->init_buf->data, 5, s, s->msg_callback_arg);
 			s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
 			}
 		}

 	return ret;
 	}

 static int ssl23_get_server_hello(SSL *s)
 	{
 	char buf[8];
 	unsigned char *p;
 	int i;
 	int n;

 	n=ssl23_read_bytes(s,7);

 	if (n != 7) return(n);
 	p=s->packet;

 	memcpy(buf,p,n);

 	if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
 		(p[5] == 0x00) && (p[6] == 0x02))
 		{
 		OPENSSL_PUT_ERROR(SSL, ssl23_get_server_hello, SSL_R_UNSUPPORTED_PROTOCOL);
 		goto err;
 		}
 	else if (p[1] == SSL3_VERSION_MAJOR &&
 	         p[2] <= TLS1_2_VERSION_MINOR &&
 	         ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) ||
 	          (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2)))
 		{
 		/* we have sslv3 or tls1 (server hello or alert) */

 		if ((p[2] == SSL3_VERSION_MINOR) &&
 			!(s->options & SSL_OP_NO_SSLv3))
 			{
 #ifdef OPENSSL_FIPS
 			if(FIPS_mode())
 				{
 				OPENSSL_PUT_ERROR(SSL, ssl23_get_server_hello, SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
 				goto err;
 				}
 #endif
 			s->version=SSL3_VERSION;
 			s->method=SSLv3_client_method();
 			}
 		else if ((p[2] == TLS1_VERSION_MINOR) &&
 			!(s->options & SSL_OP_NO_TLSv1))
 			{
 			s->version=TLS1_VERSION;
 			s->method=TLSv1_client_method();
 			}
 		else if ((p[2] == TLS1_1_VERSION_MINOR) &&
 			!(s->options & SSL_OP_NO_TLSv1_1))
 			{
 			s->version=TLS1_1_VERSION;
 			s->method=TLSv1_1_client_method();
 			}
 		else if ((p[2] == TLS1_2_VERSION_MINOR) &&
 			!(s->options & SSL_OP_NO_TLSv1_2))
 			{
 			s->version=TLS1_2_VERSION;
 			s->method=TLSv1_2_client_method();
 			}
 		else
 			{
 			OPENSSL_PUT_ERROR(SSL, ssl23_get_server_hello, SSL_R_UNSUPPORTED_PROTOCOL);
 			goto err;
 			}

 		if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING)
 			{
 			/* fatal alert */

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

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

 			i=p[5];
 			if (cb != NULL)
 				{
 				j=(i<<8)|p[6];
 				cb(s,SSL_CB_READ_ALERT,j);
 				}

 			if (s->msg_callback)
 				{
 				s->msg_callback(0, s->version, SSL3_RT_HEADER, p, 5, s, s->msg_callback_arg);
 				s->msg_callback(0, s->version, SSL3_RT_ALERT, p+5, 2, s, s->msg_callback_arg);
 				}

 			s->rwstate=SSL_NOTHING;
 			OPENSSL_PUT_ERROR(SSL, ssl23_get_server_hello, SSL_AD_REASON_OFFSET + p[6]);
 			goto err;
 			}

 		if (!ssl_init_wbio_buffer(s,1)) goto err;

 		/* we are in this state */
 		s->state=SSL3_ST_CR_SRVR_HELLO_A;

 		/* put the 7 bytes we have read into the input buffer
 		 * for SSLv3 */
 		s->rstate=SSL_ST_READ_HEADER;
 		s->packet_length=n;
 		if (s->s3->rbuf.buf == NULL)
 			if (!ssl3_setup_read_buffer(s))
 				goto err;
 		s->packet= &(s->s3->rbuf.buf[0]);
 		memcpy(s->packet,buf,n);
 		s->s3->rbuf.left=n;
 		s->s3->rbuf.offset=0;

 		s->handshake_func=s->method->ssl_connect;
 		}
 	else
 		{
 		OPENSSL_PUT_ERROR(SSL, ssl23_get_server_hello, SSL_R_UNKNOWN_PROTOCOL);
 		goto err;
 		}
 	s->init_num=0;

 	/* Since, if we are sending a ssl23 client hello, we are not
 	 * reusing a session-id */
 	if (!ssl_get_new_session(s,0))
 		goto err;

 	return(SSL_connect(s));
 err:
 	return(-1);
 	}
	/* 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) 1998-2006 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 <openssl/buf.h>
	#include <openssl/err.h>
	#include <openssl/evp.h>
	#include <openssl/obj.h>
	#include <openssl/rand.h>

	#include "ssl_locl.h"

	static const SSL_METHOD *ssl23_get_client_method(int ver);
	static int ssl23_client_hello(SSL *s);
	static int ssl23_get_server_hello(SSL *s);
	static const SSL_METHOD *ssl23_get_client_method(int ver)
	{
	if (ver == SSL3_VERSION)
	return(SSLv3_client_method());
	else if (ver == TLS1_VERSION)
	return(TLSv1_client_method());
	else if (ver == TLS1_1_VERSION)
	return(TLSv1_1_client_method());
	else if (ver == TLS1_2_VERSION)
	return(TLSv1_2_client_method());
	else
	return(NULL);
	}

	IMPLEMENT_ssl23_meth_func(SSLv23_client_method,
	ssl_undefined_function,
	ssl23_connect,
	ssl23_get_client_method)

	int ssl23_connect(SSL *s)
	{
	BUF_MEM *buf=NULL;
	void (cb)(const SSL ssl,int type,int val)=NULL;
	int ret= -1;
	int new_state,state;

	ERR_clear_error();
	ERR_clear_system_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_CONNECT:
	case SSL_ST_BEFORE\|SSL_ST_CONNECT:
	case SSL_ST_OK\|SSL_ST_CONNECT:

	if (s->session != NULL)
	{
	OPENSSL_PUT_ERROR(SSL, ssl23_connect, SSL_R_SSL23_DOING_SESSION_ID_REUSE);
	ret= -1;
	goto end;
	}
	s->server=0;
	if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);

	/* s->version=TLS1_VERSION; */
	s->type=SSL_ST_CONNECT;

	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;
	buf=NULL;
	}

	if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }

	ssl3_init_finished_mac(s);

	s->state=SSL23_ST_CW_CLNT_HELLO_A;
	s->ctx->stats.sess_connect++;
	s->init_num=0;
	break;

	case SSL23_ST_CW_CLNT_HELLO_A:
	case SSL23_ST_CW_CLNT_HELLO_B:

	s->shutdown=0;
	ret=ssl23_client_hello(s);
	if (ret <= 0) goto end;
	s->state=SSL23_ST_CR_SRVR_HELLO_A;
	s->init_num=0;

	break;

	case SSL23_ST_CR_SRVR_HELLO_A:
	case SSL23_ST_CR_SRVR_HELLO_B:
	ret=ssl23_get_server_hello(s);
	if (ret >= 0) cb=NULL;
	goto end;
	/* break; */

	default:
	OPENSSL_PUT_ERROR(SSL, ssl23_connect, SSL_R_UNKNOWN_STATE);
	ret= -1;
	goto end;
	/* break; */
	}

	if (s->debug) { (void)BIO_flush(s->wbio); }

	if ((cb != NULL) && (s->state != state))
	{
	new_state=s->state;
	s->state=state;
	cb(s,SSL_CB_CONNECT_LOOP,1);
	s->state=new_state;
	}
	}
	end:
	s->in_handshake--;
	if (buf != NULL)
	BUF_MEM_free(buf);
	if (cb != NULL)
	cb(s,SSL_CB_CONNECT_EXIT,ret);
	return(ret);
	}

	static int ssl23_no_ssl2_ciphers(SSL *s)
	{
	SSL_CIPHER *cipher;
	STACK_OF(SSL_CIPHER) *ciphers;
	int i;
	ciphers = SSL_get_ciphers(s);
	for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++)
	{
	cipher = sk_SSL_CIPHER_value(ciphers, i);
	if (cipher->algorithm_ssl == SSL_SSLV2)
	return 0;
	}
	return 1;
	}

	/* Fill a ClientRandom or ServerRandom field of length len. Returns <= 0
	* on failure, 1 on success. */
	int ssl_fill_hello_random(SSL s, int server, unsigned char result, int len)
	{
	int send_time = 0;
	if (len < 4)
	return 0;
	if (server)
	send_time = (s->mode & SSL_MODE_SEND_SERVERHELLO_TIME) != 0;
	else
	send_time = (s->mode & SSL_MODE_SEND_CLIENTHELLO_TIME) != 0;
	if (send_time)
	{
	unsigned long Time = (unsigned long)time(NULL);
	unsigned char *p = result;
	l2n(Time, p);
	return RAND_pseudo_bytes(p, len-4);
	}
	else
	return RAND_pseudo_bytes(result, len);
	}

	static int ssl23_client_hello(SSL *s)
	{
	unsigned char *buf;
	unsigned char p,d;
	int i,ch_len;
	unsigned long l;
	int ssl2_compat;
	int version = 0, version_major, version_minor;
	int ret;
	unsigned long mask, options = s->options;

	ssl2_compat = (options & SSL_OP_NO_SSLv2) ? 0 : 1;

	if (ssl2_compat && ssl23_no_ssl2_ciphers(s))
	ssl2_compat = 0;

	/*
	* SSL_OP_NO_X disables all protocols above X if there are
	* some protocols below X enabled. This is required in order
	* to maintain "version capability" vector contiguous. So
	* that if application wants to disable TLS1.0 in favour of
	* TLS1>=1, it would be insufficient to pass SSL_NO_TLSv1, the
	* answer is SSL_OP_NO_TLSv1\|SSL_OP_NO_SSLv3\|SSL_OP_NO_SSLv2.
	*/
	mask = SSL_OP_NO_TLSv1_1\|SSL_OP_NO_TLSv1
	#if !defined(OPENSSL_NO_SSL3)
	\|SSL_OP_NO_SSLv3
	#endif
	;
	#if !defined(OPENSSL_NO_TLS1_2_CLIENT)
	version = TLS1_2_VERSION;

	if ((options & SSL_OP_NO_TLSv1_2) && (options & mask) != mask)
	version = TLS1_1_VERSION;
	#else
	version = TLS1_1_VERSION;
	#endif
	mask &= ~SSL_OP_NO_TLSv1_1;
	if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask)
	version = TLS1_VERSION;
	mask &= ~SSL_OP_NO_TLSv1;
	#if !defined(OPENSSL_NO_SSL3)
	if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask)
	version = SSL3_VERSION;
	mask &= ~SSL_OP_NO_SSLv3;
	#endif

	#ifndef OPENSSL_NO_TLSEXT
	if (version != SSL2_VERSION)
	{
	/* have to disable SSL 2.0 compatibility if we need TLS extensions */

	if (s->tlsext_hostname != NULL)
	ssl2_compat = 0;
	if (s->tlsext_status_type != -1)
	ssl2_compat = 0;
	#ifdef TLSEXT_TYPE_opaque_prf_input
	if (s->ctx->tlsext_opaque_prf_input_callback != 0 \|\| s->tlsext_opaque_prf_input != NULL)
	ssl2_compat = 0;
	#endif
	if (s->ctx->tlsext_authz_server_audit_proof_cb != NULL)
	ssl2_compat = 0;
	if (s->ctx->custom_cli_ext_records_count != 0)
	ssl2_compat = 0;
	}
	#endif

	buf=(unsigned char *)s->init_buf->data;
	if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
	{
	#if 0
	/* don't reuse session-id's */
	if (!ssl_get_new_session(s,0))
	{
	return(-1);
	}
	#endif

	p=s->s3->client_random;
	if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0)
	return -1;

	if (version == TLS1_2_VERSION)
	{
	version_major = TLS1_2_VERSION_MAJOR;
	version_minor = TLS1_2_VERSION_MINOR;
	}
	else if (tls1_suiteb(s))
	{
	OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
	return -1;
	}
	else if (version == TLS1_1_VERSION)
	{
	version_major = TLS1_1_VERSION_MAJOR;
	version_minor = TLS1_1_VERSION_MINOR;
	}
	else if (version == TLS1_VERSION)
	{
	version_major = TLS1_VERSION_MAJOR;
	version_minor = TLS1_VERSION_MINOR;
	}
	#ifdef OPENSSL_FIPS
	else if(FIPS_mode())
	{
	OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
	return -1;
	}
	#endif
	else if (version == SSL3_VERSION)
	{
	version_major = SSL3_VERSION_MAJOR;
	version_minor = SSL3_VERSION_MINOR;
	}
	else if (version == SSL2_VERSION)
	{
	version_major = SSL2_VERSION_MAJOR;
	version_minor = SSL2_VERSION_MINOR;
	}
	else
	{
	OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, SSL_R_NO_PROTOCOLS_AVAILABLE);
	return(-1);
	}

	s->client_version = version;

	if (ssl2_compat)
	{
	/* create SSL 2.0 compatible Client Hello */

	/* two byte record header will be written last */
	d = &(buf[2]);
	p = d + 9; /* leave space for message type, version, individual length fields */

	*(d++) = SSL2_MT_CLIENT_HELLO;
	*(d++) = version_major;
	*(d++) = version_minor;

	/* Ciphers supported */
	i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0);
	if (i == 0)
	{
	/* no ciphers */
	OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, SSL_R_NO_CIPHERS_AVAILABLE);
	return -1;
	}
	s2n(i,d);
	p+=i;

	/* put in the session-id length (zero since there is no reuse) */
	#if 0
	s->session->session_id_length=0;
	#endif
	s2n(0,d);

	if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
	ch_len=SSL2_CHALLENGE_LENGTH;
	else
	ch_len=SSL2_MAX_CHALLENGE_LENGTH;

	/* write out sslv2 challenge */
	/* Note that ch_len must be <= SSL3_RANDOM_SIZE (32),
	because it is one of SSL2_MAX_CHALLENGE_LENGTH (32)
	or SSL2_MAX_CHALLENGE_LENGTH (16), but leave the
	check in for futurproofing */
	if (SSL3_RANDOM_SIZE < ch_len)
	i=SSL3_RANDOM_SIZE;
	else
	i=ch_len;
	s2n(i,d);
	memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
	if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
	return -1;

	memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
	p+=i;

	i= p- &(buf[2]);
	buf[0]=((i>>8)&0xff)\|0x80;
	buf[1]=(i&0xff);

	/* number of bytes to write */
	s->init_num=i+2;
	s->init_off=0;

	ssl3_finish_mac(s,&(buf[2]),i);
	}
	else
	{
	/* create Client Hello in SSL 3.0/TLS 1.0 format */

	/* do the record header (5 bytes) and handshake message
	* header (4 bytes) last. Note: the final argument to
	* ssl_add_clienthello_tlsext below depends on the size
	* of this prefix. */
	d = p = &(buf[9]);

	*(p++) = version_major;
	*(p++) = version_minor;

	/* Random stuff */
	memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
	p += SSL3_RANDOM_SIZE;

	/* Session ID (zero since there is no reuse) */
	*(p++) = 0;

	/* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
	i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char);
	if (i == 0)
	{
	OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, SSL_R_NO_CIPHERS_AVAILABLE);
	return -1;
	}
	#ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
	/* Some servers hang if client hello > 256 bytes
	* as hack workaround chop number of supported ciphers
	* to keep it well below this if we use TLS v1.2
	*/
	if (TLS1_get_version(s) >= TLS1_2_VERSION
	&& i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
	i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
	#endif
	s2n(i,p);
	p+=i;

	/* COMPRESSION */
	*(p++)=1;
	(p++)=0; / Add the NULL method */

	#ifndef OPENSSL_NO_TLSEXT
	/* TLS extensions*/
	if (ssl_prepare_clienthello_tlsext(s) <= 0)
	{
	OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, SSL_R_CLIENTHELLO_TLSEXT);
	return -1;
	}

	/* The buffer includes the 5 byte record header, so
	* subtract it to compute hlen for
	* ssl_add_clienthello_tlsext. */
	if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, p-buf-5)) == NULL)
	{
	OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, ERR_R_INTERNAL_ERROR);
	return -1;
	}
	#endif

	l = p-d;

	/* fill in 4-byte handshake header */
	d=&(buf[5]);
	*(d++)=SSL3_MT_CLIENT_HELLO;
	l2n3(l,d);

	l += 4;

	if (l > SSL3_RT_MAX_PLAIN_LENGTH)
	{
	OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, ERR_R_INTERNAL_ERROR);
	return -1;
	}

	/* fill in 5-byte record header */
	d=buf;
	*(d++) = SSL3_RT_HANDSHAKE;
	*(d++) = version_major;
	/* Some servers hang if we use long client hellos
	* and a record number > TLS 1.0.
	*/
	if (TLS1_get_client_version(s) > TLS1_VERSION)
	*(d++) = 1;
	else
	*(d++) = version_minor;
	s2n((int)l,d);

	/* number of bytes to write */
	s->init_num=p-buf;
	s->init_off=0;

	ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
	}

	s->state=SSL23_ST_CW_CLNT_HELLO_B;
	s->init_off=0;
	}

	/* SSL3_ST_CW_CLNT_HELLO_B */
	ret = ssl23_write_bytes(s);

	if ((ret >= 2) && s->msg_callback)
	{
	/* Client Hello has been sent; tell msg_callback */

	if (ssl2_compat)
	s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
	else
	{
	s->msg_callback(1, version, SSL3_RT_HEADER, s->init_buf->data, 5, s, s->msg_callback_arg);
	s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
	}
	}

	return ret;
	}

	static int ssl23_get_server_hello(SSL *s)
	{
	char buf[8];
	unsigned char *p;
	int i;
	int n;

	n=ssl23_read_bytes(s,7);

	if (n != 7) return(n);
	p=s->packet;

	memcpy(buf,p,n);

	if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
	(p[5] == 0x00) && (p[6] == 0x02))
	{
	OPENSSL_PUT_ERROR(SSL, ssl23_get_server_hello, SSL_R_UNSUPPORTED_PROTOCOL);
	goto err;
	}
	else if (p[1] == SSL3_VERSION_MAJOR &&
	p[2] <= TLS1_2_VERSION_MINOR &&
	((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) \|\|
	(p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2)))
	{
	/* we have sslv3 or tls1 (server hello or alert) */

	if ((p[2] == SSL3_VERSION_MINOR) &&
	!(s->options & SSL_OP_NO_SSLv3))
	{
	#ifdef OPENSSL_FIPS
	if(FIPS_mode())
	{
	OPENSSL_PUT_ERROR(SSL, ssl23_get_server_hello, SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
	goto err;
	}
	#endif
	s->version=SSL3_VERSION;
	s->method=SSLv3_client_method();
	}
	else if ((p[2] == TLS1_VERSION_MINOR) &&
	!(s->options & SSL_OP_NO_TLSv1))
	{
	s->version=TLS1_VERSION;
	s->method=TLSv1_client_method();
	}
	else if ((p[2] == TLS1_1_VERSION_MINOR) &&
	!(s->options & SSL_OP_NO_TLSv1_1))
	{
	s->version=TLS1_1_VERSION;
	s->method=TLSv1_1_client_method();
	}
	else if ((p[2] == TLS1_2_VERSION_MINOR) &&
	!(s->options & SSL_OP_NO_TLSv1_2))
	{
	s->version=TLS1_2_VERSION;
	s->method=TLSv1_2_client_method();
	}
	else
	{
	OPENSSL_PUT_ERROR(SSL, ssl23_get_server_hello, SSL_R_UNSUPPORTED_PROTOCOL);
	goto err;
	}

	if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING)
	{
	/* fatal alert */

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

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

	i=p[5];
	if (cb != NULL)
	{
	j=(i<<8)\|p[6];
	cb(s,SSL_CB_READ_ALERT,j);
	}

	if (s->msg_callback)
	{
	s->msg_callback(0, s->version, SSL3_RT_HEADER, p, 5, s, s->msg_callback_arg);
	s->msg_callback(0, s->version, SSL3_RT_ALERT, p+5, 2, s, s->msg_callback_arg);
	}

	s->rwstate=SSL_NOTHING;
	OPENSSL_PUT_ERROR(SSL, ssl23_get_server_hello, SSL_AD_REASON_OFFSET + p[6]);
	goto err;
	}

	if (!ssl_init_wbio_buffer(s,1)) goto err;

	/* we are in this state */
	s->state=SSL3_ST_CR_SRVR_HELLO_A;

	/* put the 7 bytes we have read into the input buffer
	* for SSLv3 */
	s->rstate=SSL_ST_READ_HEADER;
	s->packet_length=n;
	if (s->s3->rbuf.buf == NULL)
	if (!ssl3_setup_read_buffer(s))
	goto err;
	s->packet= &(s->s3->rbuf.buf[0]);
	memcpy(s->packet,buf,n);
	s->s3->rbuf.left=n;
	s->s3->rbuf.offset=0;

	s->handshake_func=s->method->ssl_connect;
	}
	else
	{
	OPENSSL_PUT_ERROR(SSL, ssl23_get_server_hello, SSL_R_UNKNOWN_PROTOCOL);
	goto err;
	}
	s->init_num=0;

	/* Since, if we are sending a ssl23 client hello, we are not
	* reusing a session-id */
	if (!ssl_get_new_session(s,0))
	goto err;

	return(SSL_connect(s));
	err:
	return(-1);
	}