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s23_clnt.c

/* ssl/s23_clnt.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.]
 */

#include <stdio.h>
#include "ssl_locl.h"
#include <openssl/buffer.h>
#include <openssl/rand.h>
#include <openssl/objects.h>
#include <openssl/evp.h>

static SSL_METHOD *ssl23_get_client_method(int ver);
static int ssl23_client_hello(SSL *s);
static int ssl23_get_server_hello(SSL *s);
static 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
            return(NULL);
      }

SSL_METHOD *SSLv23_client_method(void)
      {
      static int init=1;
      static SSL_METHOD SSLv23_client_data;

      if (init)
            {
            CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);

            if (init)
                  {
                  memcpy((char *)&SSLv23_client_data,
                        (char *)sslv23_base_method(),sizeof(SSL_METHOD));
                  SSLv23_client_data.ssl_connect=ssl23_connect;
                  SSLv23_client_data.get_ssl_method=ssl23_get_client_method;
                  init=0;
                  }

            CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
            }
      return(&SSLv23_client_data);
      }

int ssl23_connect(SSL *s)
      {
      BUF_MEM *buf=NULL;
      unsigned long Time=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_client_hello(SSL *s)
      {
      unsigned char *buf;
      unsigned char *p,*d;
      int i,ch_len;
      int ret;

      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(RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE) <= 0)
                return -1;

            /* Do the message type and length last */
            d= &(buf[2]);
            p=d+9;

            *(d++)=SSL2_MT_CLIENT_HELLO;
            if (!(s->options & SSL_OP_NO_TLSv1))
                  {
                  *(d++)=TLS1_VERSION_MAJOR;
                  *(d++)=TLS1_VERSION_MINOR;
                  s->client_version=TLS1_VERSION;
                  }
            else if (!(s->options & SSL_OP_NO_SSLv3))
                  {
                  *(d++)=SSL3_VERSION_MAJOR;
                  *(d++)=SSL3_VERSION_MINOR;
                  s->client_version=SSL3_VERSION;
                  }
            else if (!(s->options & SSL_OP_NO_SSLv2))
                  {
                  *(d++)=SSL2_VERSION_MAJOR;
                  *(d++)=SSL2_VERSION_MINOR;
                  s->client_version=SSL2_VERSION;
                  }
            else
                  {
                  SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
                  return(-1);
                  }

            /* Ciphers supported */
            i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p);
            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, 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 */
            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);

            s->state=SSL23_ST_CW_CLNT_HELLO_B;
            /* number of bytes to write */
            s->init_num=i+2;
            s->init_off=0;

            ssl3_finish_mac(s,&(buf[2]),i);
            }

      /* SSL3_ST_CW_CLNT_HELLO_B */
      ret = ssl23_write_bytes(s);
      if (ret >= 2)
            if (s->msg_callback)
                  s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg); /* CLIENT-HELLO */
      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 */
            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 5 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[0] == SSL3_RT_HANDSHAKE) &&
             (p[1] == SSL3_VERSION_MAJOR) &&
             ((p[2] == SSL3_VERSION_MINOR) ||
              (p[2] == TLS1_VERSION_MINOR)) &&
             (p[5] == SSL3_MT_SERVER_HELLO))
            {
            /* we have sslv3 or tls1 */

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

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

            /* put the 5 bytes we have read into the input buffer
             * for SSLv3 */
            s->rstate=SSL_ST_READ_HEADER;
            s->packet_length=n;
            s->packet= &(s->s3->rbuf.buf[0]);
            memcpy(s->packet,buf,n);
            s->s3->rbuf.left=n;
            s->s3->rbuf.offset=0;

            if ((p[2] == SSL3_VERSION_MINOR) &&
                  !(s->options & SSL_OP_NO_SSLv3))
                  {
                  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
                  {
                  SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
                  goto err;
                  }
                  
            s->handshake_func=s->method->ssl_connect;
            }
      else if ((p[0] == SSL3_RT_ALERT) &&
             (p[1] == SSL3_VERSION_MAJOR) &&
             ((p[2] == SSL3_VERSION_MINOR) ||
              (p[2] == TLS1_VERSION_MINOR)) &&
             (p[3] == 0) &&
             (p[4] == 2))
            {
            void (*cb)(const SSL *ssl,int type,int val)=NULL;
            int j;

            /* An alert */
            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);
                  }

            s->rwstate=SSL_NOTHING;
            SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
            goto err;
            }
      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;

      s->first_packet=1;
      return(SSL_connect(s));
err:
      return(-1);
      }


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