s23_clnt.c

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/* ssl/s23_clnt.c */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([email protected]).
 * 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 ([email protected]).
 * 
 * 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 ([email protected])"
 *    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 ([email protected])"
 * 
 * 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
 *    [email protected].
 *
 * 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
 * ([email protected]).  This product includes software written by Tim
 * Hudson ([email protected]).
 *
 */

#include <stdio.h>
#include "ssl_locl.h"
#include <openssl/buffer.h>
#include <openssl/rand.h>
#include <openssl/objects.h>
#include <openssl/evp.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)
    {
#ifndef OPENSSL_NO_SSL2
    if (ver == SSL2_VERSION)
        return(SSLv2_client_method());
#endif
    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;
    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_CONNECT:
        case SSL_ST_BEFORE|SSL_ST_CONNECT:
        case SSL_ST_OK|SSL_ST_CONNECT:

            if (s->session != NULL)
                {
                SSLerr(SSL_F_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:
            SSLerr(SSL_F_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;
    }

static int ssl23_client_hello(SSL *s)
    {
    unsigned char *buf;
    unsigned char *p,*d;
    int i,ch_len;
    unsigned long Time,l;
    int ssl2_compat;
    int version = 0, version_major, version_minor;
#ifndef OPENSSL_NO_COMP
    int j;
    SSL_COMP *comp;
#endif
    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_SSL2)
        |(ssl2_compat?SSL_OP_NO_SSLv2:0)
#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
#if !defined(OPENSSL_NO_SSL2)
    if ((options & SSL_OP_NO_SSLv3) && (options & mask) != mask)
        version = SSL2_VERSION;
#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
        }
#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;
        Time=(unsigned long)time(NULL);     /* Time */
        l2n(Time,p);
        if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
            return -1;

        if (version == TLS1_2_VERSION)
            {
            version_major = TLS1_2_VERSION_MAJOR;
            version_minor = TLS1_2_VERSION_MINOR;
            }
        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())
            {
            SSLerr(SSL_F_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
            {
            SSLerr(SSL_F_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 */
                SSLerr(SSL_F_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 */
            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)
                {
                SSLerr(SSL_F_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 */
#ifdef OPENSSL_NO_COMP
            *(p++)=1;
#else
            if ((s->options & SSL_OP_NO_COMPRESSION)
                        || !s->ctx->comp_methods)
                j=0;
            else
                j=sk_SSL_COMP_num(s->ctx->comp_methods);
            *(p++)=1+j;
            for (i=0; i<j; i++)
                {
                comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
                *(p++)=comp->id;
                }
#endif
            *(p++)=0; /* Add the NULL method */

#ifndef OPENSSL_NO_TLSEXT
            /* TLS extensions*/
            if (ssl_prepare_clienthello_tlsext(s) <= 0)
                {
                SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
                return -1;
                }
            if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
                {
                SSLerr(SSL_F_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)
                {
                SSLerr(SSL_F_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_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))
        {
#ifdef OPENSSL_NO_SSL2
        SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
        goto err;
#else
        /* we are talking sslv2 */
        /* we need to clean up the SSLv3 setup and put in the
         * sslv2 stuff. */
        int ch_len;

        if (s->options & SSL_OP_NO_SSLv2)
            {
            SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
            goto err;
            }
        if (s->s2 == NULL)
            {
            if (!ssl2_new(s))
                goto err;
            }
        else
            ssl2_clear(s);

        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 */
        i=(SSL3_RANDOM_SIZE < ch_len)
            ?SSL3_RANDOM_SIZE:ch_len;
        s->s2->challenge_length=i;
        memcpy(s->s2->challenge,
            &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);

        if (s->s3 != NULL) ssl3_free(s);

        if (!BUF_MEM_grow_clean(s->init_buf,
            SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
            {
            SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
            goto err;
            }

        s->state=SSL2_ST_GET_SERVER_HELLO_A;
        if (!(s->client_version == SSL2_VERSION))
            /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
            s->s2->ssl2_rollback=1;

        /* setup the 7 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;

        /* we have already written one */
        s->s2->write_sequence=1;

        s->method=SSLv2_client_method();
        s->handshake_func=s->method->ssl_connect;
#endif
        }
    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())
                {
                SSLerr(SSL_F_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
            {
            SSLerr(SSL_F_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_ALERT, p+5, 2, s, s->msg_callback_arg);

            s->rwstate=SSL_NOTHING;
            SSLerr(SSL_F_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
        {
        SSLerr(SSL_F_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);
    }