ssl/s23_srvr.c

   1 /* ssl/s23_srvr.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  * Copyright (c) 1998-2006 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111
 112 #include <stdio.h>
 113 #include "ssl_locl.h"
 114 #include <openssl/buffer.h>
 115 #include <openssl/rand.h>
 116 #include <openssl/objects.h>
 117 #include <openssl/evp.h>
 118
 119 static const SSL_METHOD *ssl23_get_server_method(int ver);
 120 int ssl23_get_client_hello(SSL *s);
 121 static const SSL_METHOD *ssl23_get_server_method(int ver)
 122         {
 123 #ifndef OPENSSL_NO_SSL3
 124         if (ver == SSL3_VERSION)
 125                 return(SSLv3_server_method());
 126 #endif
 127         if (ver == TLS1_VERSION)
 128                 return(TLSv1_server_method());
 129         else if (ver == TLS1_1_VERSION)
 130                 return(TLSv1_1_server_method());
 131         else if (ver == TLS1_2_VERSION)
 132                 return(TLSv1_2_server_method());
 133         else
 134                 return(NULL);
 135         }
 136
 137 IMPLEMENT_ssl23_meth_func(SSLv23_server_method,
 138                         ssl23_accept,
 139                         ssl_undefined_function,
 140                         ssl23_get_server_method)
 141
 142 int ssl23_accept(SSL *s)
 143         {
 144         BUF_MEM *buf;
 145         unsigned long Time=(unsigned long)time(NULL);
 146         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 147         int ret= -1;
 148         int new_state,state;
 149
 150         RAND_add(&Time,sizeof(Time),0);
 151         ERR_clear_error();
 152         clear_sys_error();
 153
 154         if (s->info_callback != NULL)
 155                 cb=s->info_callback;
 156         else if (s->ctx->info_callback != NULL)
 157                 cb=s->ctx->info_callback;
 158
 159         s->in_handshake++;
 160         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 161
 162         for (;;)
 163                 {
 164                 state=s->state;
 165
 166                 switch(s->state)
 167                         {
 168                 case SSL_ST_BEFORE:
 169                 case SSL_ST_ACCEPT:
 170                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 171                 case SSL_ST_OK|SSL_ST_ACCEPT:
 172
 173                         s->server=1;
 174                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 175
 176                         /* s->version=SSL3_VERSION; */
 177                         s->type=SSL_ST_ACCEPT;
 178
 179                         if (s->init_buf == NULL)
 180                                 {
 181                                 if ((buf=BUF_MEM_new()) == NULL)
 182                                         {
 183                                         ret= -1;
 184                                         goto end;
 185                                         }
 186                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 187                                         {
 188                                         ret= -1;
 189                                         goto end;
 190                                         }
 191                                 s->init_buf=buf;
 192                                 }
 193
 194                         ssl3_init_finished_mac(s);
 195
 196                         s->state=SSL23_ST_SR_CLNT_HELLO_A;
 197                         s->ctx->stats.sess_accept++;
 198                         s->init_num=0;
 199                         break;
 200
 201                 case SSL23_ST_SR_CLNT_HELLO_A:
 202                 case SSL23_ST_SR_CLNT_HELLO_B:
 203
 204                         s->shutdown=0;
 205                         ret=ssl23_get_client_hello(s);
 206                         if (ret >= 0) cb=NULL;
 207                         goto end;
 208                         /* break; */
 209
 210                 default:
 211                         SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
 212                         ret= -1;
 213                         goto end;
 214                         /* break; */
 215                         }
 216
 217                 if ((cb != NULL) && (s->state != state))
 218                         {
 219                         new_state=s->state;
 220                         s->state=state;
 221                         cb(s,SSL_CB_ACCEPT_LOOP,1);
 222                         s->state=new_state;
 223                         }
 224                 }
 225 end:
 226         s->in_handshake--;
 227         if (cb != NULL)
 228                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 229         return(ret);
 230         }
 231
 232 int ssl23_get_client_hello(SSL *s)
 233         {
 234         char buf_space[11]; /* Request this many bytes in initial read.
 235                              * We can detect SSL 3.0/TLS 1.0 Client Hellos
 236                              * ('type == 3') correctly only when the following
 237                              * is in a single record, which is not guaranteed by
 238                              * the protocol specification:
 239                              * Byte  Content
 240                              *  0     type            \
 241                              *  1/2   version          > record header
 242                              *  3/4   length          /
 243                              *  5     msg_type        \
 244                              *  6-8   length           > Client Hello message
 245                              *  9/10  client_version  /
 246                              */
 247         char *buf= &(buf_space[0]);
 248         unsigned char *p,*d,*d_len,*dd;
 249         unsigned int i;
 250         unsigned int csl,sil,cl;
 251         int n=0,j;
 252         int type=0;
 253         int v[2];
 254
 255         if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
 256                 {
 257                 /* read the initial header */
 258                 v[0]=v[1]=0;
 259
 260                 if (!ssl3_setup_buffers(s)) goto err;
 261
 262                 n=ssl23_read_bytes(s, sizeof buf_space);
 263                 if (n != sizeof buf_space) return(n); /* n == -1 || n == 0 */
 264
 265                 p=s->packet;
 266
 267                 memcpy(buf,p,n);
 268
 269                 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
 270                         {
 271                         /*
 272                          * SSLv2 header
 273                          */
 274                         if ((p[3] == 0x00) && (p[4] == 0x02))
 275                                 {
 276                                 v[0]=p[3]; v[1]=p[4];
 277                                 /* SSLv2 */
 278                                 }
 279                         else if (p[3] == SSL3_VERSION_MAJOR)
 280                                 {
 281                                 v[0]=p[3]; v[1]=p[4];
 282                                 /* SSLv3/TLSv1 */
 283                                 if (p[4] >= TLS1_VERSION_MINOR)
 284                                         {
 285                                         if (p[4] >= TLS1_2_VERSION_MINOR &&
 286                                            !(s->options & SSL_OP_NO_TLSv1_2))
 287                                                 {
 288                                                 s->version=TLS1_2_VERSION;
 289                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 290                                                 }
 291                                         else if (p[4] >= TLS1_1_VERSION_MINOR &&
 292                                            !(s->options & SSL_OP_NO_TLSv1_1))
 293                                                 {
 294                                                 s->version=TLS1_1_VERSION;
 295                                                 /* type=2; */ /* done later to survive restarts */
 296                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 297                                                 }
 298                                         else if (!(s->options & SSL_OP_NO_TLSv1))
 299                                                 {
 300                                                 s->version=TLS1_VERSION;
 301                                                 /* type=2; */ /* done later to survive restarts */
 302                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 303                                                 }
 304                                         else if (!(s->options & SSL_OP_NO_SSLv3))
 305                                                 {
 306                                                 s->version=SSL3_VERSION;
 307                                                 /* type=2; */
 308                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 309                                                 }
 310                                         }
 311                                 else if (!(s->options & SSL_OP_NO_SSLv3))
 312                                         {
 313                                         s->version=SSL3_VERSION;
 314                                         /* type=2; */
 315                                         s->state=SSL23_ST_SR_CLNT_HELLO_B;
 316                                         }
 317                                 }
 318                         }
 319                 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 320                          (p[1] == SSL3_VERSION_MAJOR) &&
 321                          (p[5] == SSL3_MT_CLIENT_HELLO) &&
 322                          ((p[3] == 0 && p[4] < 5 /* silly record length? */)
 323                                 || (p[9] >= p[1])))
 324                         {
 325                         /*
 326                          * SSLv3 or tls1 header
 327                          */
 328
 329                         v[0]=p[1]; /* major version (= SSL3_VERSION_MAJOR) */
 330                         /* We must look at client_version inside the Client Hello message
 331                          * to get the correct minor version.
 332                          * However if we have only a pathologically small fragment of the
 333                          * Client Hello message, this would be difficult, and we'd have
 334                          * to read more records to find out.
 335                          * No known SSL 3.0 client fragments ClientHello like this,
 336                          * so we simply reject such connections to avoid
 337                          * protocol version downgrade attacks. */
 338                         if (p[3] == 0 && p[4] < 6)
 339                                 {
 340                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_SMALL);
 341                                 goto err;
 342                                 }
 343                         /* if major version number > 3 set minor to a value
 344                          * which will use the highest version 3 we support.
 345                          * If TLS 2.0 ever appears we will need to revise
 346                          * this....
 347                          */
 348                         if (p[9] > SSL3_VERSION_MAJOR)
 349                                 v[1]=0xff;
 350                         else
 351                                 v[1]=p[10]; /* minor version according to client_version */
 352                         if (v[1] >= TLS1_VERSION_MINOR)
 353                                 {
 354                                 if (v[1] >= TLS1_2_VERSION_MINOR &&
 355                                         !(s->options & SSL_OP_NO_TLSv1_2))
 356                                         {
 357                                         s->version=TLS1_2_VERSION;
 358                                         type=3;
 359                                         }
 360                                 else if (v[1] >= TLS1_1_VERSION_MINOR &&
 361                                         !(s->options & SSL_OP_NO_TLSv1_1))
 362                                         {
 363                                         s->version=TLS1_1_VERSION;
 364                                         type=3;
 365                                         }
 366                                 else if (!(s->options & SSL_OP_NO_TLSv1))
 367                                         {
 368                                         s->version=TLS1_VERSION;
 369                                         type=3;
 370                                         }
 371                                 else if (!(s->options & SSL_OP_NO_SSLv3))
 372                                         {
 373                                         s->version=SSL3_VERSION;
 374                                         type=3;
 375                                         }
 376                                 }
 377                         else
 378                                 {
 379                                 /* client requests SSL 3.0 */
 380                                 if (!(s->options & SSL_OP_NO_SSLv3))
 381                                         {
 382                                         s->version=SSL3_VERSION;
 383                                         type=3;
 384                                         }
 385                                 else if (!(s->options & SSL_OP_NO_TLSv1))
 386                                         {
 387                                         /* we won't be able to use TLS of course,
 388                                          * but this will send an appropriate alert */
 389                                         s->version=TLS1_VERSION;
 390                                         type=3;
 391                                         }
 392                                 }
 393                         }
 394                 else if ((strncmp("GET ", (char *)p,4) == 0) ||
 395                          (strncmp("POST ",(char *)p,5) == 0) ||
 396                          (strncmp("HEAD ",(char *)p,5) == 0) ||
 397                          (strncmp("PUT ", (char *)p,4) == 0))
 398                         {
 399                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
 400                         goto err;
 401                         }
 402                 else if (strncmp("CONNECT",(char *)p,7) == 0)
 403                         {
 404                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
 405                         goto err;
 406                         }
 407                 }
 408
 409         /* ensure that TLS_MAX_VERSION is up-to-date */
 410         OPENSSL_assert(s->version <= TLS_MAX_VERSION);
 411
 412         if (s->version < TLS1_2_VERSION && tls1_suiteb(s))
 413                 {
 414                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
 415                                 SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
 416                 goto err;
 417                 }
 418
 419         if (FIPS_mode() && (s->version < TLS1_VERSION))
 420                 {
 421                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
 422                                         SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
 423                 goto err;
 424                 }
 425
 426         if (!ssl_security(s, SSL_SECOP_VERSION, 0, s->version, NULL))
 427                 {
 428                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_VERSION_TOO_LOW);
 429                 goto err;
 430                 }
 431
 432         if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
 433                 {
 434                 /* we have SSLv3/TLSv1 in an SSLv2 header
 435                  * (other cases skip this state) */
 436
 437                 type=2;
 438                 p=s->packet;
 439                 v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
 440                 v[1] = p[4];
 441
 442                 /* An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
 443                  * header is sent directly on the wire, not wrapped as a TLS
 444                  * record. It's format is:
 445                  * Byte  Content
 446                  * 0-1   msg_length
 447                  * 2     msg_type
 448                  * 3-4   version
 449                  * 5-6   cipher_spec_length
 450                  * 7-8   session_id_length
 451                  * 9-10  challenge_length
 452                  * ...   ...
 453                  */
 454                 n=((p[0]&0x7f)<<8)|p[1];
 455                 if (n > (1024*4))
 456                         {
 457                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
 458                         goto err;
 459                         }
 460                 if (n < 9)
 461                         {
 462                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
 463                         goto err;
 464                         }
 465
 466                 j=ssl23_read_bytes(s,n+2);
 467                 /* We previously read 11 bytes, so if j > 0, we must have
 468                  * j == n+2 == s->packet_length. We have at least 11 valid
 469                  * packet bytes. */
 470                 if (j <= 0) return(j);
 471
 472                 ssl3_finish_mac(s, s->packet+2, s->packet_length-2);
 473                 if (s->msg_callback)
 474                         s->msg_callback(0, SSL2_VERSION, 0, s->packet+2, s->packet_length-2, s, s->msg_callback_arg); /* CLIENT-HELLO */
 475
 476                 p=s->packet;
 477                 p+=5;
 478                 n2s(p,csl);
 479                 n2s(p,sil);
 480                 n2s(p,cl);
 481                 d=(unsigned char *)s->init_buf->data;
 482                 if ((csl+sil+cl+11) != s->packet_length) /* We can't have TLS extensions in SSL 2.0 format
 483                                                           * Client Hello, can we? Error condition should be
 484                                                           * '>' otherweise */
 485                         {
 486                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
 487                         goto err;
 488                         }
 489
 490                 /* record header: msg_type ... */
 491                 *(d++) = SSL3_MT_CLIENT_HELLO;
 492                 /* ... and length (actual value will be written later) */
 493                 d_len = d;
 494                 d += 3;
 495
 496                 /* client_version */
 497                 *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
 498                 *(d++) = v[1];
 499
 500                 /* lets populate the random area */
 501                 /* get the challenge_length */
 502                 i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
 503                 memset(d,0,SSL3_RANDOM_SIZE);
 504                 memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
 505                 d+=SSL3_RANDOM_SIZE;
 506
 507                 /* no session-id reuse */
 508                 *(d++)=0;
 509
 510                 /* ciphers */
 511                 j=0;
 512                 dd=d;
 513                 d+=2;
 514                 for (i=0; i<csl; i+=3)
 515                         {
 516                         if (p[i] != 0) continue;
 517                         *(d++)=p[i+1];
 518                         *(d++)=p[i+2];
 519                         j+=2;
 520                         }
 521                 s2n(j,dd);
 522
 523                 /* COMPRESSION */
 524                 *(d++)=1;
 525                 *(d++)=0;
 526
 527 #if 0
 528                 /* copy any remaining data with may be extensions */
 529                 p = p+csl+sil+cl;
 530                 while (p <  s->packet+s->packet_length)
 531                         {
 532                         *(d++)=*(p++);
 533                         }
 534 #endif
 535
 536                 i = (d-(unsigned char *)s->init_buf->data) - 4;
 537                 l2n3((long)i, d_len);
 538
 539                 /* get the data reused from the init_buf */
 540                 s->s3->tmp.reuse_message=1;
 541                 s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
 542                 s->s3->tmp.message_size=i;
 543                 }
 544
 545         /* imaginary new state (for program structure): */
 546         /* s->state = SSL23_SR_CLNT_HELLO_C */
 547
 548         if ((type == 2) || (type == 3))
 549                 {
 550                 /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */
 551                 const SSL_METHOD *new_method;
 552                 new_method = ssl23_get_server_method(s->version);
 553                 if (new_method == NULL)
 554                         {
 555                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 556                         goto err;
 557                         }
 558                 s->method = new_method;
 559
 560                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 561
 562                 /* we are in this state */
 563                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 564
 565                 if (type == 3)
 566                         {
 567                         /* put the 'n' bytes we have read into the input buffer
 568                          * for SSLv3 */
 569                         s->rstate=SSL_ST_READ_HEADER;
 570                         s->packet_length=n;
 571                         if (s->s3->rbuf.buf == NULL)
 572                                 if (!ssl3_setup_read_buffer(s))
 573                                         goto err;
 574
 575                         s->packet= &(s->s3->rbuf.buf[0]);
 576                         memcpy(s->packet,buf,n);
 577                         s->s3->rbuf.left=n;
 578                         s->s3->rbuf.offset=0;
 579                         }
 580                 else
 581                         {
 582                         s->packet_length=0;
 583                         s->s3->rbuf.left=0;
 584                         s->s3->rbuf.offset=0;
 585                         }
 586 #if 0 /* ssl3_get_client_hello does this */
 587                 s->client_version=(v[0]<<8)|v[1];
 588 #endif
 589                 s->handshake_func=s->method->ssl_accept;
 590                 }
 591         else
 592                 {
 593                 /* bad, very bad */
 594                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 595                 goto err;
 596                 }
 597         s->init_num=0;
 598
 599         if (buf != buf_space) OPENSSL_free(buf);
 600         return(SSL_accept(s));
 601 err:
 602         if (buf != buf_space) OPENSSL_free(buf);
 603         return(-1);
 604         }