crypto/openssl/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) 1998-2001 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 SSL_METHOD *ssl23_get_server_method(int ver);
 120 int ssl23_get_client_hello(SSL *s);
 121 static SSL_METHOD *ssl23_get_server_method(int ver)
 122         {
 123 #ifndef OPENSSL_NO_SSL2
 124         if (ver == SSL2_VERSION)
 125                 return(SSLv2_server_method());
 126 #endif
 127 #ifndef OPENSSL_NO_SSL3
 128         if (ver == SSL3_VERSION)
 129                 return(SSLv3_server_method());
 130 #endif
 131         if (ver == TLS1_VERSION)
 132                 return(TLSv1_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
 233 int ssl23_get_client_hello(SSL *s)
 234         {
 235         char buf_space[11]; /* Request this many bytes in initial read.
 236                              * We can detect SSL 3.0/TLS 1.0 Client Hellos
 237                              * ('type == 3') correctly only when the following
 238                              * is in a single record, which is not guaranteed by
 239                              * the protocol specification:
 240                              * Byte  Content
 241                              *  0     type            \
 242                              *  1/2   version          > record header
 243                              *  3/4   length          /
 244                              *  5     msg_type        \
 245                              *  6-8   length           > Client Hello message
 246                              *  9/10  client_version  /
 247                              */
 248         char *buf= &(buf_space[0]);
 249         unsigned char *p,*d,*d_len,*dd;
 250         unsigned int i;
 251         unsigned int csl,sil,cl;
 252         int n=0,j;
 253         int type=0;
 254         int v[2];
 255
 256         if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
 257                 {
 258                 /* read the initial header */
 259                 v[0]=v[1]=0;
 260
 261                 if (!ssl3_setup_buffers(s)) goto err;
 262
 263                 n=ssl23_read_bytes(s, sizeof buf_space);
 264                 if (n != sizeof buf_space) return(n); /* n == -1 || n == 0 */
 265
 266                 p=s->packet;
 267
 268                 memcpy(buf,p,n);
 269
 270                 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
 271                         {
 272                         /*
 273                          * SSLv2 header
 274                          */
 275                         if ((p[3] == 0x00) && (p[4] == 0x02))
 276                                 {
 277                                 v[0]=p[3]; v[1]=p[4];
 278                                 /* SSLv2 */
 279                                 if (!(s->options & SSL_OP_NO_SSLv2))
 280                                         type=1;
 281                                 }
 282                         else if (p[3] == SSL3_VERSION_MAJOR)
 283                                 {
 284                                 v[0]=p[3]; v[1]=p[4];
 285                                 /* SSLv3/TLSv1 */
 286                                 if (p[4] >= TLS1_VERSION_MINOR)
 287                                         {
 288                                         if (!(s->options & SSL_OP_NO_TLSv1))
 289                                                 {
 290                                                 s->version=TLS1_VERSION;
 291                                                 /* type=2; */ /* done later to survive restarts */
 292                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 293                                                 }
 294                                         else if (!(s->options & SSL_OP_NO_SSLv3))
 295                                                 {
 296                                                 s->version=SSL3_VERSION;
 297                                                 /* type=2; */
 298                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 299                                                 }
 300                                         else if (!(s->options & SSL_OP_NO_SSLv2))
 301                                                 {
 302                                                 type=1;
 303                                                 }
 304                                         }
 305                                 else if (!(s->options & SSL_OP_NO_SSLv3))
 306                                         {
 307                                         s->version=SSL3_VERSION;
 308                                         /* type=2; */
 309                                         s->state=SSL23_ST_SR_CLNT_HELLO_B;
 310                                         }
 311                                 else if (!(s->options & SSL_OP_NO_SSLv2))
 312                                         type=1;
 313
 314                                 }
 315                         }
 316                 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 317                          (p[1] == SSL3_VERSION_MAJOR) &&
 318                          (p[5] == SSL3_MT_CLIENT_HELLO) &&
 319                          ((p[3] == 0 && p[4] < 5 /* silly record length? */)
 320                                 || (p[9] >= p[1])))
 321                         {
 322                         /*
 323                          * SSLv3 or tls1 header
 324                          */
 325
 326                         v[0]=p[1]; /* major version (= SSL3_VERSION_MAJOR) */
 327                         /* We must look at client_version inside the Client Hello message
 328                          * to get the correct minor version.
 329                          * However if we have only a pathologically small fragment of the
 330                          * Client Hello message, this would be difficult, and we'd have
 331                          * to read more records to find out.
 332                          * No known SSL 3.0 client fragments ClientHello like this,
 333                          * so we simply reject such connections to avoid
 334                          * protocol version downgrade attacks. */
 335                         if (p[3] == 0 && p[4] < 6)
 336                                 {
 337                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_SMALL);
 338                                 goto err;
 339                                 }
 340                         /* if major version number > 3 set minor to a value
 341                          * which will use the highest version 3 we support.
 342                          * If TLS 2.0 ever appears we will need to revise
 343                          * this....
 344                          */
 345                         if (p[9] > SSL3_VERSION_MAJOR)
 346                                 v[1]=0xff;
 347                         else
 348                                 v[1]=p[10]; /* minor version according to client_version */
 349                         if (v[1] >= TLS1_VERSION_MINOR)
 350                                 {
 351                                 if (!(s->options & SSL_OP_NO_TLSv1))
 352                                         {
 353                                         s->version=TLS1_VERSION;
 354                                         type=3;
 355                                         }
 356                                 else if (!(s->options & SSL_OP_NO_SSLv3))
 357                                         {
 358                                         s->version=SSL3_VERSION;
 359                                         type=3;
 360                                         }
 361                                 }
 362                         else
 363                                 {
 364                                 /* client requests SSL 3.0 */
 365                                 if (!(s->options & SSL_OP_NO_SSLv3))
 366                                         {
 367                                         s->version=SSL3_VERSION;
 368                                         type=3;
 369                                         }
 370                                 else if (!(s->options & SSL_OP_NO_TLSv1))
 371                                         {
 372                                         /* we won't be able to use TLS of course,
 373                                          * but this will send an appropriate alert */
 374                                         s->version=TLS1_VERSION;
 375                                         type=3;
 376                                         }
 377                                 }
 378                         }
 379                 else if ((strncmp("GET ", (char *)p,4) == 0) ||
 380                          (strncmp("POST ",(char *)p,5) == 0) ||
 381                          (strncmp("HEAD ",(char *)p,5) == 0) ||
 382                          (strncmp("PUT ", (char *)p,4) == 0))
 383                         {
 384                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
 385                         goto err;
 386                         }
 387                 else if (strncmp("CONNECT",(char *)p,7) == 0)
 388                         {
 389                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
 390                         goto err;
 391                         }
 392                 }
 393
 394 #ifdef OPENSSL_FIPS
 395         if (FIPS_mode() && (s->version < TLS1_VERSION))
 396                 {
 397                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
 398                                         SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
 399                 goto err;
 400                 }
 401 #endif
 402
 403         /* ensure that TLS_MAX_VERSION is up-to-date */
 404         OPENSSL_assert(s->version <= TLS_MAX_VERSION);
 405
 406         if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
 407                 {
 408                 /* we have SSLv3/TLSv1 in an SSLv2 header
 409                  * (other cases skip this state) */
 410
 411                 type=2;
 412                 p=s->packet;
 413                 v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
 414                 v[1] = p[4];
 415
 416                 /* An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
 417                  * header is sent directly on the wire, not wrapped as a TLS
 418                  * record. It's format is:
 419                  * Byte  Content
 420                  * 0-1   msg_length
 421                  * 2     msg_type
 422                  * 3-4   version
 423                  * 5-6   cipher_spec_length
 424                  * 7-8   session_id_length
 425                  * 9-10  challenge_length
 426                  * ...   ...
 427                  */
 428                 n=((p[0]&0x7f)<<8)|p[1];
 429                 if (n > (1024*4))
 430                         {
 431                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
 432                         goto err;
 433                         }
 434                 if (n < 9)
 435                         {
 436                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
 437                         goto err;
 438                         }
 439
 440                 j=ssl23_read_bytes(s,n+2);
 441                 /* We previously read 11 bytes, so if j > 0, we must have
 442                  * j == n+2 == s->packet_length. We have at least 11 valid
 443                  * packet bytes. */
 444                 if (j <= 0) return(j);
 445
 446                 ssl3_finish_mac(s, s->packet+2, s->packet_length-2);
 447                 if (s->msg_callback)
 448                         s->msg_callback(0, SSL2_VERSION, 0, s->packet+2, s->packet_length-2, s, s->msg_callback_arg); /* CLIENT-HELLO */
 449
 450                 p=s->packet;
 451                 p+=5;
 452                 n2s(p,csl);
 453                 n2s(p,sil);
 454                 n2s(p,cl);
 455                 d=(unsigned char *)s->init_buf->data;
 456                 if ((csl+sil+cl+11) != s->packet_length)
 457                         {
 458                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
 459                         goto err;
 460                         }
 461
 462                 /* record header: msg_type ... */
 463                 *(d++) = SSL3_MT_CLIENT_HELLO;
 464                 /* ... and length (actual value will be written later) */
 465                 d_len = d;
 466                 d += 3;
 467
 468                 /* client_version */
 469                 *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
 470                 *(d++) = v[1];
 471
 472                 /* lets populate the random area */
 473                 /* get the challenge_length */
 474                 i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
 475                 memset(d,0,SSL3_RANDOM_SIZE);
 476                 memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
 477                 d+=SSL3_RANDOM_SIZE;
 478
 479                 /* no session-id reuse */
 480                 *(d++)=0;
 481
 482                 /* ciphers */
 483                 j=0;
 484                 dd=d;
 485                 d+=2;
 486                 for (i=0; i<csl; i+=3)
 487                         {
 488                         if (p[i] != 0) continue;
 489                         *(d++)=p[i+1];
 490                         *(d++)=p[i+2];
 491                         j+=2;
 492                         }
 493                 s2n(j,dd);
 494
 495                 /* COMPRESSION */
 496                 *(d++)=1;
 497                 *(d++)=0;
 498
 499                 i = (d-(unsigned char *)s->init_buf->data) - 4;
 500                 l2n3((long)i, d_len);
 501
 502                 /* get the data reused from the init_buf */
 503                 s->s3->tmp.reuse_message=1;
 504                 s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
 505                 s->s3->tmp.message_size=i;
 506                 }
 507
 508         /* imaginary new state (for program structure): */
 509         /* s->state = SSL23_SR_CLNT_HELLO_C */
 510
 511         if (type == 1)
 512                 {
 513 #ifdef OPENSSL_NO_SSL2
 514                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 515                 goto err;
 516 #else
 517                 /* we are talking sslv2 */
 518                 /* we need to clean up the SSLv3/TLSv1 setup and put in the
 519                  * sslv2 stuff. */
 520
 521                 if (s->s2 == NULL)
 522                         {
 523                         if (!ssl2_new(s))
 524                                 goto err;
 525                         }
 526                 else
 527                         ssl2_clear(s);
 528
 529                 if (s->s3 != NULL) ssl3_free(s);
 530
 531                 if (!BUF_MEM_grow_clean(s->init_buf,
 532                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 533                         {
 534                         goto err;
 535                         }
 536
 537                 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
 538                 if (s->options & SSL_OP_NO_TLSv1 && s->options & SSL_OP_NO_SSLv3)
 539                         s->s2->ssl2_rollback=0;
 540                 else
 541                         /* reject SSL 2.0 session if client supports SSL 3.0 or TLS 1.0
 542                          * (SSL 3.0 draft/RFC 2246, App. E.2) */
 543                         s->s2->ssl2_rollback=1;
 544
 545                 /* setup the n bytes we have read so we get them from
 546                  * the sslv2 buffer */
 547                 s->rstate=SSL_ST_READ_HEADER;
 548                 s->packet_length=n;
 549                 s->packet= &(s->s2->rbuf[0]);
 550                 memcpy(s->packet,buf,n);
 551                 s->s2->rbuf_left=n;
 552                 s->s2->rbuf_offs=0;
 553
 554                 s->method=SSLv2_server_method();
 555                 s->handshake_func=s->method->ssl_accept;
 556 #endif
 557                 }
 558
 559         if ((type == 2) || (type == 3))
 560                 {
 561                 /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */
 562                 s->method = ssl23_get_server_method(s->version);
 563                 if (s->method == NULL)
 564                         {
 565                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 566                         goto err;
 567                         }
 568
 569                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 570
 571                 /* we are in this state */
 572                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 573
 574                 if (type == 3)
 575                         {
 576                         /* put the 'n' bytes we have read into the input buffer
 577                          * for SSLv3 */
 578                         s->rstate=SSL_ST_READ_HEADER;
 579                         s->packet_length=n;
 580                         s->packet= &(s->s3->rbuf.buf[0]);
 581                         memcpy(s->packet,buf,n);
 582                         s->s3->rbuf.left=n;
 583                         s->s3->rbuf.offset=0;
 584                         }
 585                 else
 586                         {
 587                         s->packet_length=0;
 588                         s->s3->rbuf.left=0;
 589                         s->s3->rbuf.offset=0;
 590                         }
 591 #if 0 /* ssl3_get_client_hello does this */
 592                 s->client_version=(v[0]<<8)|v[1];
 593 #endif
 594                 s->handshake_func=s->method->ssl_accept;
 595                 }
 596
 597         if ((type < 1) || (type > 3))
 598                 {
 599                 /* bad, very bad */
 600                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 601                 goto err;
 602                 }
 603         s->init_num=0;
 604
 605         if (buf != buf_space) OPENSSL_free(buf);
 606         return(SSL_accept(s));
 607 err:
 608         if (buf != buf_space) OPENSSL_free(buf);
 609         return(-1);
 610         }