src/third_party/boringssl/src/ssl/s23_clnt.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57 /* ====================================================================
  58  * Copyright (c) 1998-2006 The OpenSSL Project.  All rights reserved.
  59  *
  60  * Redistribution and use in source and binary forms, with or without
  61  * modification, are permitted provided that the following conditions
  62  * are met:
  63  *
  64  * 1. Redistributions of source code must retain the above copyright
  65  *    notice, this list of conditions and the following disclaimer.
  66  *
  67  * 2. Redistributions in binary form must reproduce the above copyright
  68  *    notice, this list of conditions and the following disclaimer in
  69  *    the documentation and/or other materials provided with the
  70  *    distribution.
  71  *
  72  * 3. All advertising materials mentioning features or use of this
  73  *    software must display the following acknowledgment:
  74  *    "This product includes software developed by the OpenSSL Project
  75  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  76  *
  77  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  78  *    endorse or promote products derived from this software without
  79  *    prior written permission. For written permission, please contact
  80  *    openssl-core@openssl.org.
  81  *
  82  * 5. Products derived from this software may not be called "OpenSSL"
  83  *    nor may "OpenSSL" appear in their names without prior written
  84  *    permission of the OpenSSL Project.
  85  *
  86  * 6. Redistributions of any form whatsoever must retain the following
  87  *    acknowledgment:
  88  *    "This product includes software developed by the OpenSSL Project
  89  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  90  *
  91  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  92  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  93  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  94  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  95  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  96  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  97  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  98  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  99  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 100  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 101  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 102  * OF THE POSSIBILITY OF SUCH DAMAGE.
 103  * ====================================================================
 104  *
 105  * This product includes cryptographic software written by Eric Young
 106  * (eay@cryptsoft.com).  This product includes software written by Tim
 107  * Hudson (tjh@cryptsoft.com). */
 108
 109 #include <stdio.h>
 110
 111 #include <openssl/buf.h>
 112 #include <openssl/err.h>
 113 #include <openssl/evp.h>
 114 #include <openssl/obj.h>
 115 #include <openssl/rand.h>
 116
 117 #include "ssl_locl.h"
 118
 119 static const SSL_METHOD *ssl23_get_client_method(int ver);
 120 static int ssl23_client_hello(SSL *s);
 121 static int ssl23_get_server_hello(SSL *s);
 122 static const SSL_METHOD *ssl23_get_client_method(int ver)
 123         {
 124         /* When SSL_set_session is called, do NOT switch to the version-specific
 125          * method table. The server may still negotiate a different version when
 126          * rejecting the session.
 127          *
 128          * TODO(davidben): Clean this up. This duplicates logic from the
 129          * version-specific tables. https://crbug.com/403378 */
 130         return SSLv23_client_method();
 131         }
 132
 133 IMPLEMENT_ssl23_meth_func(SSLv23_client_method,
 134                         ssl_undefined_function,
 135                         ssl23_connect,
 136                         ssl23_get_client_method)
 137
 138 int ssl23_connect(SSL *s)
 139         {
 140         BUF_MEM *buf=NULL;
 141         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 142         int ret= -1;
 143         int new_state,state;
 144
 145         ERR_clear_error();
 146         ERR_clear_system_error();
 147
 148         if (s->info_callback != NULL)
 149                 cb=s->info_callback;
 150         else if (s->ctx->info_callback != NULL)
 151                 cb=s->ctx->info_callback;
 152
 153         s->in_handshake++;
 154         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 155
 156         for (;;)
 157                 {
 158                 state=s->state;
 159
 160                 switch(s->state)
 161                         {
 162                 case SSL_ST_BEFORE:
 163                 case SSL_ST_CONNECT:
 164                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 165                 case SSL_ST_OK|SSL_ST_CONNECT:
 166
 167                         s->server=0;
 168                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 169
 170                         /* s->version=TLS1_VERSION; */
 171                         s->type=SSL_ST_CONNECT;
 172
 173                         if (s->init_buf == NULL)
 174                                 {
 175                                 if ((buf=BUF_MEM_new()) == NULL)
 176                                         {
 177                                         ret= -1;
 178                                         goto end;
 179                                         }
 180                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 181                                         {
 182                                         ret= -1;
 183                                         goto end;
 184                                         }
 185                                 s->init_buf=buf;
 186                                 buf=NULL;
 187                                 }
 188
 189                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 190
 191                         ssl3_init_finished_mac(s);
 192
 193                         s->state=SSL23_ST_CW_CLNT_HELLO_A;
 194                         s->ctx->stats.sess_connect++;
 195                         s->init_num=0;
 196                         break;
 197
 198                 case SSL23_ST_CW_CLNT_HELLO_A:
 199                 case SSL23_ST_CW_CLNT_HELLO_B:
 200
 201                         s->shutdown=0;
 202                         ret=ssl23_client_hello(s);
 203                         if (ret <= 0) goto end;
 204                         s->state=SSL23_ST_CR_SRVR_HELLO_A;
 205                         s->init_num=0;
 206
 207                         break;
 208
 209                 case SSL23_ST_CR_SRVR_HELLO_A:
 210                 case SSL23_ST_CR_SRVR_HELLO_B:
 211                         ret=ssl23_get_server_hello(s);
 212                         if (ret >= 0) cb=NULL;
 213                         goto end;
 214                         /* break; */
 215
 216                 default:
 217                         OPENSSL_PUT_ERROR(SSL, ssl23_connect, SSL_R_UNKNOWN_STATE);
 218                         ret= -1;
 219                         goto end;
 220                         /* break; */
 221                         }
 222
 223                 if (s->debug) { (void)BIO_flush(s->wbio); }
 224
 225                 if ((cb != NULL) && (s->state != state))
 226                         {
 227                         new_state=s->state;
 228                         s->state=state;
 229                         cb(s,SSL_CB_CONNECT_LOOP,1);
 230                         s->state=new_state;
 231                         }
 232                 }
 233 end:
 234         s->in_handshake--;
 235         if (buf != NULL)
 236                 BUF_MEM_free(buf);
 237         if (cb != NULL)
 238                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 239         return(ret);
 240         }
 241
 242 /* Fill a ClientRandom or ServerRandom field of length len. Returns <= 0
 243  * on failure, 1 on success. */
 244 int ssl_fill_hello_random(SSL *s, int server, unsigned char *result, int len)
 245         {
 246                 int send_time = 0;
 247                 if (len < 4)
 248                         return 0;
 249                 if (server)
 250                         send_time = (s->mode & SSL_MODE_SEND_SERVERHELLO_TIME) != 0;
 251                 else
 252                         send_time = (s->mode & SSL_MODE_SEND_CLIENTHELLO_TIME) != 0;
 253                 if (send_time)
 254                         {
 255                         unsigned long Time = (unsigned long)time(NULL);
 256                         unsigned char *p = result;
 257                         l2n(Time, p);
 258                         return RAND_pseudo_bytes(p, len-4);
 259                         }
 260                 else
 261                         return RAND_pseudo_bytes(result, len);
 262         }
 263
 264 static int ssl23_client_hello(SSL *s)
 265         {
 266         unsigned char *buf;
 267         unsigned char *p,*d;
 268         int i;
 269         unsigned long l;
 270         int version = 0, version_major, version_minor;
 271         int ret;
 272         unsigned long mask, options = s->options;
 273
 274         /*
 275          * SSL_OP_NO_X disables all protocols above X *if* there are
 276          * some protocols below X enabled. This is required in order
 277          * to maintain "version capability" vector contiguous. So
 278          * that if application wants to disable TLS1.0 in favour of
 279          * TLS1>=1, it would be insufficient to pass SSL_NO_TLSv1, the
 280          * answer is SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2.
 281          */
 282         mask = SSL_OP_NO_TLSv1_1|SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3;
 283         version = TLS1_2_VERSION;
 284         if ((options & SSL_OP_NO_TLSv1_2) && (options & mask) != mask)
 285                 version = TLS1_1_VERSION;
 286         mask &= ~SSL_OP_NO_TLSv1_1;
 287         if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask)
 288                 version = TLS1_VERSION;
 289         mask &= ~SSL_OP_NO_TLSv1;
 290         if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask)
 291                 version = SSL3_VERSION;
 292         mask &= ~SSL_OP_NO_SSLv3;
 293
 294         buf=(unsigned char *)s->init_buf->data;
 295         if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
 296                 {
 297                 /* Check if the session is resumable. If not, drop it. */
 298                 if (s->session != NULL)
 299                         {
 300                         if (s->session->ssl_version > version ||
 301                                 s->session->session_id_length == 0 ||
 302                                 s->session->not_resumable)
 303                                 {
 304                                 SSL_SESSION_free(s->session);
 305                                 s->session = NULL;
 306                                 }
 307                         }
 308
 309                 p=s->s3->client_random;
 310                 if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0)
 311                         return -1;
 312
 313                 if (version == TLS1_2_VERSION)
 314                         {
 315                         version_major = TLS1_2_VERSION_MAJOR;
 316                         version_minor = TLS1_2_VERSION_MINOR;
 317                         }
 318                 else if (version == TLS1_1_VERSION)
 319                         {
 320                         version_major = TLS1_1_VERSION_MAJOR;
 321                         version_minor = TLS1_1_VERSION_MINOR;
 322                         }
 323                 else if (version == TLS1_VERSION)
 324                         {
 325                         version_major = TLS1_VERSION_MAJOR;
 326                         version_minor = TLS1_VERSION_MINOR;
 327                         }
 328                 else if (version == SSL3_VERSION)
 329                         {
 330                         version_major = SSL3_VERSION_MAJOR;
 331                         version_minor = SSL3_VERSION_MINOR;
 332                         }
 333                 else if (version == SSL2_VERSION)
 334                         {
 335                         version_major = SSL2_VERSION_MAJOR;
 336                         version_minor = SSL2_VERSION_MINOR;
 337                         }
 338                 else
 339                         {
 340                         OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, SSL_R_NO_PROTOCOLS_AVAILABLE);
 341                         return(-1);
 342                         }
 343
 344                 s->client_version = version;
 345
 346                 /* create Client Hello in SSL 3.0/TLS 1.0 format */
 347
 348                 /* do the record header (5 bytes) and handshake message
 349                  * header (4 bytes) last. Note: the final argument to
 350                  * ssl_add_clienthello_tlsext below depends on the size
 351                  * of this prefix. */
 352                 d = p = &(buf[9]);
 353
 354                 *(p++) = version_major;
 355                 *(p++) = version_minor;
 356
 357                 /* Random stuff */
 358                 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
 359                 p += SSL3_RANDOM_SIZE;
 360
 361                 /* Session ID */
 362                 if (s->new_session || s->session == NULL)
 363                         i=0;
 364                 else
 365                         i=s->session->session_id_length;
 366                 *(p++)=i;
 367                 if (i != 0)
 368                         {
 369                         if (i > (int)sizeof(s->session->session_id))
 370                                 {
 371                                 OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, ERR_R_INTERNAL_ERROR);
 372                                 return -1;
 373                                 }
 374                         memcpy(p,s->session->session_id,i);
 375                         p+=i;
 376                         }
 377
 378                 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
 379                 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &p[2]);
 380                 if (i == 0)
 381                         {
 382                         OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, SSL_R_NO_CIPHERS_AVAILABLE);
 383                         return -1;
 384                         }
 385                 s2n(i,p);
 386                 p+=i;
 387
 388                 /* COMPRESSION */
 389                 *(p++)=1;
 390                 *(p++)=0; /* Add the NULL method */
 391
 392                 /* TLS extensions*/
 393                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 394                         {
 395                         OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, SSL_R_CLIENTHELLO_TLSEXT);
 396                         return -1;
 397                         }
 398
 399                 /* The buffer includes the 5 byte record header, so
 400                  * subtract it to compute hlen for
 401                  * ssl_add_clienthello_tlsext. */
 402                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, p-buf-5)) == NULL)
 403                         {
 404                         OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, ERR_R_INTERNAL_ERROR);
 405                         return -1;
 406                         }
 407
 408                 l = p-d;
 409
 410                 /* fill in 4-byte handshake header */
 411                 d=&(buf[5]);
 412                 *(d++)=SSL3_MT_CLIENT_HELLO;
 413                 l2n3(l,d);
 414
 415                 l += 4;
 416
 417                 if (l > SSL3_RT_MAX_PLAIN_LENGTH)
 418                         {
 419                         OPENSSL_PUT_ERROR(SSL, ssl23_client_hello, ERR_R_INTERNAL_ERROR);
 420                         return -1;
 421                         }
 422
 423                 /* fill in 5-byte record header */
 424                 d=buf;
 425                 *(d++) = SSL3_RT_HANDSHAKE;
 426                 *(d++) = version_major;
 427                 /* Some servers hang if we use long client hellos
 428                  * and a record number > TLS 1.0.
 429                  */
 430                 if (TLS1_get_client_version(s) > TLS1_VERSION)
 431                         *(d++) = 1;
 432                 else
 433                         *(d++) = version_minor;
 434                 s2n((int)l,d);
 435
 436                 /* number of bytes to write */
 437                 s->init_num=p-buf;
 438                 s->init_off=0;
 439
 440                 ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
 441
 442                 s->state=SSL23_ST_CW_CLNT_HELLO_B;
 443                 s->init_off=0;
 444                 }
 445
 446         /* SSL3_ST_CW_CLNT_HELLO_B */
 447         ret = ssl23_write_bytes(s);
 448
 449         if ((ret >= 2) && s->msg_callback)
 450                 {
 451                 /* Client Hello has been sent; tell msg_callback */
 452
 453                 s->msg_callback(1, version, SSL3_RT_HEADER, s->init_buf->data, 5, s, s->msg_callback_arg);
 454                 s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
 455                 }
 456
 457         return ret;
 458         }
 459
 460 static int ssl23_get_server_hello(SSL *s)
 461         {
 462         char buf[8];
 463         unsigned char *p;
 464         int i;
 465         int n;
 466
 467         n=ssl23_read_bytes(s,7);
 468
 469         if (n != 7) return(n);
 470         p=s->packet;
 471
 472         memcpy(buf,p,n);
 473
 474         if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
 475                 (p[5] == 0x00) && (p[6] == 0x02))
 476                 {
 477                 OPENSSL_PUT_ERROR(SSL, ssl23_get_server_hello, SSL_R_UNSUPPORTED_PROTOCOL);
 478                 goto err;
 479                 }
 480         else if (p[1] == SSL3_VERSION_MAJOR &&
 481                  p[2] <= TLS1_2_VERSION_MINOR &&
 482                  ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) ||
 483                   (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2)))
 484                 {
 485                 /* we have sslv3 or tls1 (server hello or alert) */
 486
 487                 if ((p[2] == SSL3_VERSION_MINOR) &&
 488                         !(s->options & SSL_OP_NO_SSLv3))
 489                         {
 490                         s->version=SSL3_VERSION;
 491                         s->method=SSLv3_client_method();
 492                         }
 493                 else if ((p[2] == TLS1_VERSION_MINOR) &&
 494                         !(s->options & SSL_OP_NO_TLSv1))
 495                         {
 496                         s->version=TLS1_VERSION;
 497                         s->method=TLSv1_client_method();
 498                         }
 499                 else if ((p[2] == TLS1_1_VERSION_MINOR) &&
 500                         !(s->options & SSL_OP_NO_TLSv1_1))
 501                         {
 502                         s->version=TLS1_1_VERSION;
 503                         s->method=TLSv1_1_client_method();
 504                         }
 505                 else if ((p[2] == TLS1_2_VERSION_MINOR) &&
 506                         !(s->options & SSL_OP_NO_TLSv1_2))
 507                         {
 508                         s->version=TLS1_2_VERSION;
 509                         s->method=TLSv1_2_client_method();
 510                         }
 511                 else
 512                         {
 513                         OPENSSL_PUT_ERROR(SSL, ssl23_get_server_hello, SSL_R_UNSUPPORTED_PROTOCOL);
 514                         goto err;
 515                         }
 516
 517                 if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING)
 518                         {
 519                         /* fatal alert */
 520
 521                         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 522                         int j;
 523
 524                         if (s->info_callback != NULL)
 525                                 cb=s->info_callback;
 526                         else if (s->ctx->info_callback != NULL)
 527                                 cb=s->ctx->info_callback;
 528
 529                         i=p[5];
 530                         if (cb != NULL)
 531                                 {
 532                                 j=(i<<8)|p[6];
 533                                 cb(s,SSL_CB_READ_ALERT,j);
 534                                 }
 535
 536                         if (s->msg_callback)
 537                                 {
 538                                 s->msg_callback(0, s->version, SSL3_RT_HEADER, p, 5, s, s->msg_callback_arg);
 539                                 s->msg_callback(0, s->version, SSL3_RT_ALERT, p+5, 2, s, s->msg_callback_arg);
 540                                 }
 541
 542                         s->rwstate=SSL_NOTHING;
 543                         OPENSSL_PUT_ERROR(SSL, ssl23_get_server_hello, SSL_AD_REASON_OFFSET + p[6]);
 544                         goto err;
 545                         }
 546
 547                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 548
 549                 /* we are in this state */
 550                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 551
 552                 /* put the 7 bytes we have read into the input buffer
 553                  * for SSLv3 */
 554                 s->rstate=SSL_ST_READ_HEADER;
 555                 s->packet_length=n;
 556                 if (s->s3->rbuf.buf == NULL)
 557                         if (!ssl3_setup_read_buffer(s))
 558                                 goto err;
 559                 s->packet= &(s->s3->rbuf.buf[0]);
 560                 memcpy(s->packet,buf,n);
 561                 s->s3->rbuf.left=n;
 562                 s->s3->rbuf.offset=0;
 563
 564                 s->handshake_func=s->method->ssl_connect;
 565                 }
 566         else
 567                 {
 568                 OPENSSL_PUT_ERROR(SSL, ssl23_get_server_hello, SSL_R_UNKNOWN_PROTOCOL);
 569                 goto err;
 570                 }
 571         s->init_num=0;
 572
 573         /* If there was no session to resume, now that the final version is
 574          * determined, insert a fresh one. */
 575         if (s->session == NULL && !ssl_get_new_session(s,0))
 576                 goto err;
 577
 578         return(SSL_connect(s));
 579 err:
 580         return(-1);
 581         }