crypto/openssl/ssl/s23_clnt.c

   1 /* ssl/s23_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include "ssl_locl.h"
  61 #include <openssl/buffer.h>
  62 #include <openssl/rand.h>
  63 #include <openssl/objects.h>
  64 #include <openssl/evp.h>
  65
  66 static SSL_METHOD *ssl23_get_client_method(int ver);
  67 static int ssl23_client_hello(SSL *s);
  68 static int ssl23_get_server_hello(SSL *s);
  69 static SSL_METHOD *ssl23_get_client_method(int ver)
  70         {
  71 #ifndef OPENSSL_NO_SSL2
  72         if (ver == SSL2_VERSION)
  73                 return(SSLv2_client_method());
  74 #endif
  75         if (ver == SSL3_VERSION)
  76                 return(SSLv3_client_method());
  77         else if (ver == TLS1_VERSION)
  78                 return(TLSv1_client_method());
  79         else
  80                 return(NULL);
  81         }
  82
  83 IMPLEMENT_ssl23_meth_func(SSLv23_client_method,
  84                         ssl_undefined_function,
  85                         ssl23_connect,
  86                         ssl23_get_client_method)
  87
  88 int ssl23_connect(SSL *s)
  89         {
  90         BUF_MEM *buf=NULL;
  91         unsigned long Time=(unsigned long)time(NULL);
  92         void (*cb)(const SSL *ssl,int type,int val)=NULL;
  93         int ret= -1;
  94         int new_state,state;
  95
  96         RAND_add(&Time,sizeof(Time),0);
  97         ERR_clear_error();
  98         clear_sys_error();
  99
 100         if (s->info_callback != NULL)
 101                 cb=s->info_callback;
 102         else if (s->ctx->info_callback != NULL)
 103                 cb=s->ctx->info_callback;
 104
 105         s->in_handshake++;
 106         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 107
 108         for (;;)
 109                 {
 110                 state=s->state;
 111
 112                 switch(s->state)
 113                         {
 114                 case SSL_ST_BEFORE:
 115                 case SSL_ST_CONNECT:
 116                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 117                 case SSL_ST_OK|SSL_ST_CONNECT:
 118
 119                         if (s->session != NULL)
 120                                 {
 121                                 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE);
 122                                 ret= -1;
 123                                 goto end;
 124                                 }
 125                         s->server=0;
 126                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 127
 128                         /* s->version=TLS1_VERSION; */
 129                         s->type=SSL_ST_CONNECT;
 130
 131                         if (s->init_buf == NULL)
 132                                 {
 133                                 if ((buf=BUF_MEM_new()) == NULL)
 134                                         {
 135                                         ret= -1;
 136                                         goto end;
 137                                         }
 138                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 139                                         {
 140                                         ret= -1;
 141                                         goto end;
 142                                         }
 143                                 s->init_buf=buf;
 144                                 buf=NULL;
 145                                 }
 146
 147                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 148
 149                         ssl3_init_finished_mac(s);
 150
 151                         s->state=SSL23_ST_CW_CLNT_HELLO_A;
 152                         s->ctx->stats.sess_connect++;
 153                         s->init_num=0;
 154                         break;
 155
 156                 case SSL23_ST_CW_CLNT_HELLO_A:
 157                 case SSL23_ST_CW_CLNT_HELLO_B:
 158
 159                         s->shutdown=0;
 160                         ret=ssl23_client_hello(s);
 161                         if (ret <= 0) goto end;
 162                         s->state=SSL23_ST_CR_SRVR_HELLO_A;
 163                         s->init_num=0;
 164
 165                         break;
 166
 167                 case SSL23_ST_CR_SRVR_HELLO_A:
 168                 case SSL23_ST_CR_SRVR_HELLO_B:
 169                         ret=ssl23_get_server_hello(s);
 170                         if (ret >= 0) cb=NULL;
 171                         goto end;
 172                         /* break; */
 173
 174                 default:
 175                         SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE);
 176                         ret= -1;
 177                         goto end;
 178                         /* break; */
 179                         }
 180
 181                 if (s->debug) { (void)BIO_flush(s->wbio); }
 182
 183                 if ((cb != NULL) && (s->state != state))
 184                         {
 185                         new_state=s->state;
 186                         s->state=state;
 187                         cb(s,SSL_CB_CONNECT_LOOP,1);
 188                         s->state=new_state;
 189                         }
 190                 }
 191 end:
 192         s->in_handshake--;
 193         if (buf != NULL)
 194                 BUF_MEM_free(buf);
 195         if (cb != NULL)
 196                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 197         return(ret);
 198         }
 199
 200
 201 static int ssl23_client_hello(SSL *s)
 202         {
 203         unsigned char *buf;
 204         unsigned char *p,*d;
 205         int i,j,ch_len;
 206         unsigned long Time,l;
 207         int ssl2_compat;
 208         int version = 0, version_major, version_minor;
 209         SSL_COMP *comp;
 210         int ret;
 211
 212         ssl2_compat = (s->options & SSL_OP_NO_SSLv2) ? 0 : 1;
 213
 214         if (!(s->options & SSL_OP_NO_TLSv1))
 215                 {
 216                 version = TLS1_VERSION;
 217                 }
 218         else if (!(s->options & SSL_OP_NO_SSLv3))
 219                 {
 220                 version = SSL3_VERSION;
 221                 }
 222         else if (!(s->options & SSL_OP_NO_SSLv2))
 223                 {
 224                 version = SSL2_VERSION;
 225                 }
 226 #ifndef OPENSSL_NO_TLSEXT
 227         if (version != SSL2_VERSION)
 228                 {
 229                 /* have to disable SSL 2.0 compatibility if we need TLS extensions */
 230
 231                 if (s->tlsext_hostname != NULL)
 232                         ssl2_compat = 0;
 233                 if (s->tlsext_status_type != -1)
 234                         ssl2_compat = 0;
 235                 }
 236 #endif
 237
 238         buf=(unsigned char *)s->init_buf->data;
 239         if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
 240                 {
 241 #if 0
 242                 /* don't reuse session-id's */
 243                 if (!ssl_get_new_session(s,0))
 244                         {
 245                         return(-1);
 246                         }
 247 #endif
 248
 249                 p=s->s3->client_random;
 250                 Time=(unsigned long)time(NULL);         /* Time */
 251                 l2n(Time,p);
 252                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 253                         return -1;
 254
 255                 if (version == TLS1_VERSION)
 256                         {
 257                         version_major = TLS1_VERSION_MAJOR;
 258                         version_minor = TLS1_VERSION_MINOR;
 259                         }
 260 #ifdef OPENSSL_FIPS
 261                 else if(FIPS_mode())
 262                         {
 263                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,
 264                                         SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
 265                         return -1;
 266                         }
 267 #endif
 268                 else if (version == SSL3_VERSION)
 269                         {
 270                         version_major = SSL3_VERSION_MAJOR;
 271                         version_minor = SSL3_VERSION_MINOR;
 272                         }
 273                 else if (version == SSL2_VERSION)
 274                         {
 275                         version_major = SSL2_VERSION_MAJOR;
 276                         version_minor = SSL2_VERSION_MINOR;
 277                         }
 278                 else
 279                         {
 280                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
 281                         return(-1);
 282                         }
 283
 284                 s->client_version = version;
 285
 286                 if (ssl2_compat)
 287                         {
 288                         /* create SSL 2.0 compatible Client Hello */
 289
 290                         /* two byte record header will be written last */
 291                         d = &(buf[2]);
 292                         p = d + 9; /* leave space for message type, version, individual length fields */
 293
 294                         *(d++) = SSL2_MT_CLIENT_HELLO;
 295                         *(d++) = version_major;
 296                         *(d++) = version_minor;
 297
 298                         /* Ciphers supported */
 299                         i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0);
 300                         if (i == 0)
 301                                 {
 302                                 /* no ciphers */
 303                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 304                                 return -1;
 305                                 }
 306                         s2n(i,d);
 307                         p+=i;
 308
 309                         /* put in the session-id length (zero since there is no reuse) */
 310 #if 0
 311                         s->session->session_id_length=0;
 312 #endif
 313                         s2n(0,d);
 314
 315                         if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 316                                 ch_len=SSL2_CHALLENGE_LENGTH;
 317                         else
 318                                 ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 319
 320                         /* write out sslv2 challenge */
 321                         if (SSL3_RANDOM_SIZE < ch_len)
 322                                 i=SSL3_RANDOM_SIZE;
 323                         else
 324                                 i=ch_len;
 325                         s2n(i,d);
 326                         memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
 327                         if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
 328                                 return -1;
 329
 330                         memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 331                         p+=i;
 332
 333                         i= p- &(buf[2]);
 334                         buf[0]=((i>>8)&0xff)|0x80;
 335                         buf[1]=(i&0xff);
 336
 337                         /* number of bytes to write */
 338                         s->init_num=i+2;
 339                         s->init_off=0;
 340
 341                         ssl3_finish_mac(s,&(buf[2]),i);
 342                         }
 343                 else
 344                         {
 345                         /* create Client Hello in SSL 3.0/TLS 1.0 format */
 346
 347                         /* do the record header (5 bytes) and handshake message header (4 bytes) last */
 348                         d = p = &(buf[9]);
 349
 350                         *(p++) = version_major;
 351                         *(p++) = version_minor;
 352
 353                         /* Random stuff */
 354                         memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
 355                         p += SSL3_RANDOM_SIZE;
 356
 357                         /* Session ID (zero since there is no reuse) */
 358                         *(p++) = 0;
 359
 360                         /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
 361                         i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char);
 362                         if (i == 0)
 363                                 {
 364                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 365                                 return -1;
 366                                 }
 367                         s2n(i,p);
 368                         p+=i;
 369
 370                         /* COMPRESSION */
 371                         if (s->ctx->comp_methods == NULL)
 372                                 j=0;
 373                         else
 374                                 j=sk_SSL_COMP_num(s->ctx->comp_methods);
 375                         *(p++)=1+j;
 376                         for (i=0; i<j; i++)
 377                                 {
 378                                 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 379                                 *(p++)=comp->id;
 380                                 }
 381                         *(p++)=0; /* Add the NULL method */
 382 #ifndef OPENSSL_NO_TLSEXT
 383                         if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 384                                 {
 385                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 386                                 return -1;
 387                                 }
 388 #endif
 389
 390                         l = p-d;
 391                         *p = 42;
 392
 393                         /* fill in 4-byte handshake header */
 394                         d=&(buf[5]);
 395                         *(d++)=SSL3_MT_CLIENT_HELLO;
 396                         l2n3(l,d);
 397
 398                         l += 4;
 399
 400                         if (l > SSL3_RT_MAX_PLAIN_LENGTH)
 401                                 {
 402                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 403                                 return -1;
 404                                 }
 405
 406                         /* fill in 5-byte record header */
 407                         d=buf;
 408                         *(d++) = SSL3_RT_HANDSHAKE;
 409                         *(d++) = version_major;
 410                         *(d++) = version_minor; /* arguably we should send the *lowest* suported version here
 411                                                  * (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */
 412                         s2n((int)l,d);
 413
 414                         /* number of bytes to write */
 415                         s->init_num=p-buf;
 416                         s->init_off=0;
 417
 418                         ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
 419                         }
 420
 421                 s->state=SSL23_ST_CW_CLNT_HELLO_B;
 422                 s->init_off=0;
 423                 }
 424
 425         /* SSL3_ST_CW_CLNT_HELLO_B */
 426         ret = ssl23_write_bytes(s);
 427
 428         if ((ret >= 2) && s->msg_callback)
 429                 {
 430                 /* Client Hello has been sent; tell msg_callback */
 431
 432                 if (ssl2_compat)
 433                         s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
 434                 else
 435                         s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
 436                 }
 437
 438         return ret;
 439         }
 440
 441 static int ssl23_get_server_hello(SSL *s)
 442         {
 443         char buf[8];
 444         unsigned char *p;
 445         int i;
 446         int n;
 447
 448         n=ssl23_read_bytes(s,7);
 449
 450         if (n != 7) return(n);
 451         p=s->packet;
 452
 453         memcpy(buf,p,n);
 454
 455         if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
 456                 (p[5] == 0x00) && (p[6] == 0x02))
 457                 {
 458 #ifdef OPENSSL_NO_SSL2
 459                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 460                 goto err;
 461 #else
 462                 /* we are talking sslv2 */
 463                 /* we need to clean up the SSLv3 setup and put in the
 464                  * sslv2 stuff. */
 465                 int ch_len;
 466
 467                 if (s->options & SSL_OP_NO_SSLv2)
 468                         {
 469                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 470                         goto err;
 471                         }
 472                 if (s->s2 == NULL)
 473                         {
 474                         if (!ssl2_new(s))
 475                                 goto err;
 476                         }
 477                 else
 478                         ssl2_clear(s);
 479
 480                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 481                         ch_len=SSL2_CHALLENGE_LENGTH;
 482                 else
 483                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 484
 485                 /* write out sslv2 challenge */
 486                 i=(SSL3_RANDOM_SIZE < ch_len)
 487                         ?SSL3_RANDOM_SIZE:ch_len;
 488                 s->s2->challenge_length=i;
 489                 memcpy(s->s2->challenge,
 490                         &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 491
 492                 if (s->s3 != NULL) ssl3_free(s);
 493
 494                 if (!BUF_MEM_grow_clean(s->init_buf,
 495                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 496                         {
 497                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
 498                         goto err;
 499                         }
 500
 501                 s->state=SSL2_ST_GET_SERVER_HELLO_A;
 502                 if (!(s->client_version == SSL2_VERSION))
 503                         /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
 504                         s->s2->ssl2_rollback=1;
 505
 506                 /* setup the 5 bytes we have read so we get them from
 507                  * the sslv2 buffer */
 508                 s->rstate=SSL_ST_READ_HEADER;
 509                 s->packet_length=n;
 510                 s->packet= &(s->s2->rbuf[0]);
 511                 memcpy(s->packet,buf,n);
 512                 s->s2->rbuf_left=n;
 513                 s->s2->rbuf_offs=0;
 514
 515                 /* we have already written one */
 516                 s->s2->write_sequence=1;
 517
 518                 s->method=SSLv2_client_method();
 519                 s->handshake_func=s->method->ssl_connect;
 520 #endif
 521                 }
 522         else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 523                  (p[1] == SSL3_VERSION_MAJOR) &&
 524                  ((p[2] == SSL3_VERSION_MINOR) ||
 525                   (p[2] == TLS1_VERSION_MINOR)) &&
 526                  (p[5] == SSL3_MT_SERVER_HELLO))
 527                 {
 528                 /* we have sslv3 or tls1 */
 529
 530                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 531
 532                 /* we are in this state */
 533                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 534
 535                 /* put the 5 bytes we have read into the input buffer
 536                  * for SSLv3 */
 537                 s->rstate=SSL_ST_READ_HEADER;
 538                 s->packet_length=n;
 539                 s->packet= &(s->s3->rbuf.buf[0]);
 540                 memcpy(s->packet,buf,n);
 541                 s->s3->rbuf.left=n;
 542                 s->s3->rbuf.offset=0;
 543
 544                 if ((p[2] == SSL3_VERSION_MINOR) &&
 545                         !(s->options & SSL_OP_NO_SSLv3))
 546                         {
 547 #ifdef OPENSSL_FIPS
 548                         if(FIPS_mode())
 549                                 {
 550                                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,
 551                                         SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
 552                                 goto err;
 553                                 }
 554 #endif
 555                         s->version=SSL3_VERSION;
 556                         s->method=SSLv3_client_method();
 557                         }
 558                 else if ((p[2] == TLS1_VERSION_MINOR) &&
 559                         !(s->options & SSL_OP_NO_TLSv1))
 560                         {
 561                         s->version=TLS1_VERSION;
 562                         s->method=TLSv1_client_method();
 563                         }
 564                 else
 565                         {
 566                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 567                         goto err;
 568                         }
 569
 570                 s->handshake_func=s->method->ssl_connect;
 571                 }
 572         else if ((p[0] == SSL3_RT_ALERT) &&
 573                  (p[1] == SSL3_VERSION_MAJOR) &&
 574                  ((p[2] == SSL3_VERSION_MINOR) ||
 575                   (p[2] == TLS1_VERSION_MINOR)) &&
 576                  (p[3] == 0) &&
 577                  (p[4] == 2))
 578                 {
 579                 void (*cb)(const SSL *ssl,int type,int val)=NULL;
 580                 int j;
 581
 582                 /* An alert */
 583                 if (s->info_callback != NULL)
 584                         cb=s->info_callback;
 585                 else if (s->ctx->info_callback != NULL)
 586                         cb=s->ctx->info_callback;
 587
 588                 i=p[5];
 589                 if (cb != NULL)
 590                         {
 591                         j=(i<<8)|p[6];
 592                         cb(s,SSL_CB_READ_ALERT,j);
 593                         }
 594
 595                 s->rwstate=SSL_NOTHING;
 596                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
 597                 goto err;
 598                 }
 599         else
 600                 {
 601                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 602                 goto err;
 603                 }
 604         s->init_num=0;
 605
 606         /* Since, if we are sending a ssl23 client hello, we are not
 607          * reusing a session-id */
 608         if (!ssl_get_new_session(s,0))
 609                 goto err;
 610
 611         return(SSL_connect(s));
 612 err:
 613         return(-1);
 614         }
 615