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 #ifdef OPENSSL_FIPS
 119 #include <openssl/fips.h>
 120 #endif
 121
 122 static const SSL_METHOD *ssl23_get_server_method(int ver);
 123 int ssl23_get_client_hello(SSL *s);
 124 static const SSL_METHOD *ssl23_get_server_method(int ver)
 125         {
 126 #ifndef OPENSSL_NO_SSL2
 127         if (ver == SSL2_VERSION)
 128                 return(SSLv2_server_method());
 129 #endif
 130 #ifndef OPENSSL_NO_SSL3
 131         if (ver == SSL3_VERSION)
 132                 return(SSLv3_server_method());
 133 #endif
 134         if (ver == TLS1_VERSION)
 135                 return(TLSv1_server_method());
 136         else if (ver == TLS1_1_VERSION)
 137                 return(TLSv1_1_server_method());
 138         else if (ver == TLS1_2_VERSION)
 139                 return(TLSv1_2_server_method());
 140         else
 141                 return(NULL);
 142         }
 143
 144 IMPLEMENT_ssl23_meth_func(SSLv23_server_method,
 145                         ssl23_accept,
 146                         ssl_undefined_function,
 147                         ssl23_get_server_method)
 148
 149 int ssl23_accept(SSL *s)
 150         {
 151         BUF_MEM *buf;
 152         unsigned long Time=(unsigned long)time(NULL);
 153         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 154         int ret= -1;
 155         int new_state,state;
 156
 157         RAND_add(&Time,sizeof(Time),0);
 158         ERR_clear_error();
 159         clear_sys_error();
 160
 161         if (s->info_callback != NULL)
 162                 cb=s->info_callback;
 163         else if (s->ctx->info_callback != NULL)
 164                 cb=s->ctx->info_callback;
 165
 166         s->in_handshake++;
 167         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 168
 169         for (;;)
 170                 {
 171                 state=s->state;
 172
 173                 switch(s->state)
 174                         {
 175                 case SSL_ST_BEFORE:
 176                 case SSL_ST_ACCEPT:
 177                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 178                 case SSL_ST_OK|SSL_ST_ACCEPT:
 179
 180                         s->server=1;
 181                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 182
 183                         /* s->version=SSL3_VERSION; */
 184                         s->type=SSL_ST_ACCEPT;
 185
 186                         if (s->init_buf == NULL)
 187                                 {
 188                                 if ((buf=BUF_MEM_new()) == NULL)
 189                                         {
 190                                         ret= -1;
 191                                         goto end;
 192                                         }
 193                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 194                                         {
 195                                         ret= -1;
 196                                         goto end;
 197                                         }
 198                                 s->init_buf=buf;
 199                                 }
 200
 201                         ssl3_init_finished_mac(s);
 202
 203                         s->state=SSL23_ST_SR_CLNT_HELLO_A;
 204                         s->ctx->stats.sess_accept++;
 205                         s->init_num=0;
 206                         break;
 207
 208                 case SSL23_ST_SR_CLNT_HELLO_A:
 209                 case SSL23_ST_SR_CLNT_HELLO_B:
 210
 211                         s->shutdown=0;
 212                         ret=ssl23_get_client_hello(s);
 213                         if (ret >= 0) cb=NULL;
 214                         goto end;
 215                         /* break; */
 216
 217                 default:
 218                         SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
 219                         ret= -1;
 220                         goto end;
 221                         /* break; */
 222                         }
 223
 224                 if ((cb != NULL) && (s->state != state))
 225                         {
 226                         new_state=s->state;
 227                         s->state=state;
 228                         cb(s,SSL_CB_ACCEPT_LOOP,1);
 229                         s->state=new_state;
 230                         }
 231                 }
 232 end:
 233         s->in_handshake--;
 234         if (cb != NULL)
 235                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 236         return(ret);
 237         }
 238
 239
 240 int ssl23_get_client_hello(SSL *s)
 241         {
 242         char buf_space[11]; /* Request this many bytes in initial read.
 243                              * We can detect SSL 3.0/TLS 1.0 Client Hellos
 244                              * ('type == 3') correctly only when the following
 245                              * is in a single record, which is not guaranteed by
 246                              * the protocol specification:
 247                              * Byte  Content
 248                              *  0     type            \
 249                              *  1/2   version          > record header
 250                              *  3/4   length          /
 251                              *  5     msg_type        \
 252                              *  6-8   length           > Client Hello message
 253                              *  9/10  client_version  /
 254                              */
 255         char *buf= &(buf_space[0]);
 256         unsigned char *p,*d,*d_len,*dd;
 257         unsigned int i;
 258         unsigned int csl,sil,cl;
 259         int n=0,j;
 260         int type=0;
 261         int v[2];
 262
 263         if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
 264                 {
 265                 /* read the initial header */
 266                 v[0]=v[1]=0;
 267
 268                 if (!ssl3_setup_buffers(s)) goto err;
 269
 270                 n=ssl23_read_bytes(s, sizeof buf_space);
 271                 if (n != sizeof buf_space) return(n); /* n == -1 || n == 0 */
 272
 273                 p=s->packet;
 274
 275                 memcpy(buf,p,n);
 276
 277                 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
 278                         {
 279                         /*
 280                          * SSLv2 header
 281                          */
 282                         if ((p[3] == 0x00) && (p[4] == 0x02))
 283                                 {
 284                                 v[0]=p[3]; v[1]=p[4];
 285                                 /* SSLv2 */
 286                                 if (!(s->options & SSL_OP_NO_SSLv2))
 287                                         type=1;
 288                                 }
 289                         else if (p[3] == SSL3_VERSION_MAJOR)
 290                                 {
 291                                 v[0]=p[3]; v[1]=p[4];
 292                                 /* SSLv3/TLSv1 */
 293                                 if (p[4] >= TLS1_VERSION_MINOR)
 294                                         {
 295                                         if (p[4] >= TLS1_2_VERSION_MINOR &&
 296                                            !(s->options & SSL_OP_NO_TLSv1_2))
 297                                                 {
 298                                                 s->version=TLS1_2_VERSION;
 299                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 300                                                 }
 301                                         else if (p[4] >= TLS1_1_VERSION_MINOR &&
 302                                            !(s->options & SSL_OP_NO_TLSv1_1))
 303                                                 {
 304                                                 s->version=TLS1_1_VERSION;
 305                                                 /* type=2; */ /* done later to survive restarts */
 306                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 307                                                 }
 308                                         else if (!(s->options & SSL_OP_NO_TLSv1))
 309                                                 {
 310                                                 s->version=TLS1_VERSION;
 311                                                 /* type=2; */ /* done later to survive restarts */
 312                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 313                                                 }
 314                                         else if (!(s->options & SSL_OP_NO_SSLv3))
 315                                                 {
 316                                                 s->version=SSL3_VERSION;
 317                                                 /* type=2; */
 318                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 319                                                 }
 320                                         else if (!(s->options & SSL_OP_NO_SSLv2))
 321                                                 {
 322                                                 type=1;
 323                                                 }
 324                                         }
 325                                 else if (!(s->options & SSL_OP_NO_SSLv3))
 326                                         {
 327                                         s->version=SSL3_VERSION;
 328                                         /* type=2; */
 329                                         s->state=SSL23_ST_SR_CLNT_HELLO_B;
 330                                         }
 331                                 else if (!(s->options & SSL_OP_NO_SSLv2))
 332                                         type=1;
 333
 334                                 }
 335                         }
 336                 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 337                          (p[1] == SSL3_VERSION_MAJOR) &&
 338                          (p[5] == SSL3_MT_CLIENT_HELLO) &&
 339                          ((p[3] == 0 && p[4] < 5 /* silly record length? */)
 340                                 || (p[9] >= p[1])))
 341                         {
 342                         /*
 343                          * SSLv3 or tls1 header
 344                          */
 345
 346                         v[0]=p[1]; /* major version (= SSL3_VERSION_MAJOR) */
 347                         /* We must look at client_version inside the Client Hello message
 348                          * to get the correct minor version.
 349                          * However if we have only a pathologically small fragment of the
 350                          * Client Hello message, this would be difficult, and we'd have
 351                          * to read more records to find out.
 352                          * No known SSL 3.0 client fragments ClientHello like this,
 353                          * so we simply reject such connections to avoid
 354                          * protocol version downgrade attacks. */
 355                         if (p[3] == 0 && p[4] < 6)
 356                                 {
 357                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_SMALL);
 358                                 goto err;
 359                                 }
 360                         /* if major version number > 3 set minor to a value
 361                          * which will use the highest version 3 we support.
 362                          * If TLS 2.0 ever appears we will need to revise
 363                          * this....
 364                          */
 365                         if (p[9] > SSL3_VERSION_MAJOR)
 366                                 v[1]=0xff;
 367                         else
 368                                 v[1]=p[10]; /* minor version according to client_version */
 369                         if (v[1] >= TLS1_VERSION_MINOR)
 370                                 {
 371                                 if (v[1] >= TLS1_2_VERSION_MINOR &&
 372                                         !(s->options & SSL_OP_NO_TLSv1_2))
 373                                         {
 374                                         s->version=TLS1_2_VERSION;
 375                                         type=3;
 376                                         }
 377                                 else if (v[1] >= TLS1_1_VERSION_MINOR &&
 378                                         !(s->options & SSL_OP_NO_TLSv1_1))
 379                                         {
 380                                         s->version=TLS1_1_VERSION;
 381                                         type=3;
 382                                         }
 383                                 else if (!(s->options & SSL_OP_NO_TLSv1))
 384                                         {
 385                                         s->version=TLS1_VERSION;
 386                                         type=3;
 387                                         }
 388                                 else if (!(s->options & SSL_OP_NO_SSLv3))
 389                                         {
 390                                         s->version=SSL3_VERSION;
 391                                         type=3;
 392                                         }
 393                                 }
 394                         else
 395                                 {
 396                                 /* client requests SSL 3.0 */
 397                                 if (!(s->options & SSL_OP_NO_SSLv3))
 398                                         {
 399                                         s->version=SSL3_VERSION;
 400                                         type=3;
 401                                         }
 402                                 else if (!(s->options & SSL_OP_NO_TLSv1))
 403                                         {
 404                                         /* we won't be able to use TLS of course,
 405                                          * but this will send an appropriate alert */
 406                                         s->version=TLS1_VERSION;
 407                                         type=3;
 408                                         }
 409                                 }
 410                         }
 411                 else if ((strncmp("GET ", (char *)p,4) == 0) ||
 412                          (strncmp("POST ",(char *)p,5) == 0) ||
 413                          (strncmp("HEAD ",(char *)p,5) == 0) ||
 414                          (strncmp("PUT ", (char *)p,4) == 0))
 415                         {
 416                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
 417                         goto err;
 418                         }
 419                 else if (strncmp("CONNECT",(char *)p,7) == 0)
 420                         {
 421                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
 422                         goto err;
 423                         }
 424                 }
 425
 426         /* ensure that TLS_MAX_VERSION is up-to-date */
 427         OPENSSL_assert(s->version <= TLS_MAX_VERSION);
 428
 429 #ifdef OPENSSL_FIPS
 430         if (FIPS_mode() && (s->version < TLS1_VERSION))
 431                 {
 432                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
 433                                         SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
 434                 goto err;
 435                 }
 436 #endif
 437
 438         if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
 439                 {
 440                 /* we have SSLv3/TLSv1 in an SSLv2 header
 441                  * (other cases skip this state) */
 442
 443                 type=2;
 444                 p=s->packet;
 445                 v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
 446                 v[1] = p[4];
 447
 448                 /* An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
 449                  * header is sent directly on the wire, not wrapped as a TLS
 450                  * record. It's format is:
 451                  * Byte  Content
 452                  * 0-1   msg_length
 453                  * 2     msg_type
 454                  * 3-4   version
 455                  * 5-6   cipher_spec_length
 456                  * 7-8   session_id_length
 457                  * 9-10  challenge_length
 458                  * ...   ...
 459                  */
 460                 n=((p[0]&0x7f)<<8)|p[1];
 461                 if (n > (1024*4))
 462                         {
 463                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
 464                         goto err;
 465                         }
 466                 if (n < 9)
 467                         {
 468                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
 469                         goto err;
 470                         }
 471
 472                 j=ssl23_read_bytes(s,n+2);
 473                 /* We previously read 11 bytes, so if j > 0, we must have
 474                  * j == n+2 == s->packet_length. We have at least 11 valid
 475                  * packet bytes. */
 476                 if (j <= 0) return(j);
 477
 478                 ssl3_finish_mac(s, s->packet+2, s->packet_length-2);
 479                 if (s->msg_callback)
 480                         s->msg_callback(0, SSL2_VERSION, 0, s->packet+2, s->packet_length-2, s, s->msg_callback_arg); /* CLIENT-HELLO */
 481
 482                 p=s->packet;
 483                 p+=5;
 484                 n2s(p,csl);
 485                 n2s(p,sil);
 486                 n2s(p,cl);
 487                 d=(unsigned char *)s->init_buf->data;
 488                 if ((csl+sil+cl+11) != s->packet_length) /* We can't have TLS extensions in SSL 2.0 format
 489                                                           * Client Hello, can we? Error condition should be
 490                                                           * '>' otherweise */
 491                         {
 492                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
 493                         goto err;
 494                         }
 495
 496                 /* record header: msg_type ... */
 497                 *(d++) = SSL3_MT_CLIENT_HELLO;
 498                 /* ... and length (actual value will be written later) */
 499                 d_len = d;
 500                 d += 3;
 501
 502                 /* client_version */
 503                 *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
 504                 *(d++) = v[1];
 505
 506                 /* lets populate the random area */
 507                 /* get the challenge_length */
 508                 i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
 509                 memset(d,0,SSL3_RANDOM_SIZE);
 510                 memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
 511                 d+=SSL3_RANDOM_SIZE;
 512
 513                 /* no session-id reuse */
 514                 *(d++)=0;
 515
 516                 /* ciphers */
 517                 j=0;
 518                 dd=d;
 519                 d+=2;
 520                 for (i=0; i<csl; i+=3)
 521                         {
 522                         if (p[i] != 0) continue;
 523                         *(d++)=p[i+1];
 524                         *(d++)=p[i+2];
 525                         j+=2;
 526                         }
 527                 s2n(j,dd);
 528
 529                 /* COMPRESSION */
 530                 *(d++)=1;
 531                 *(d++)=0;
 532
 533 #if 0
 534                 /* copy any remaining data with may be extensions */
 535                 p = p+csl+sil+cl;
 536                 while (p <  s->packet+s->packet_length)
 537                         {
 538                         *(d++)=*(p++);
 539                         }
 540 #endif
 541
 542                 i = (d-(unsigned char *)s->init_buf->data) - 4;
 543                 l2n3((long)i, d_len);
 544
 545                 /* get the data reused from the init_buf */
 546                 s->s3->tmp.reuse_message=1;
 547                 s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
 548                 s->s3->tmp.message_size=i;
 549                 }
 550
 551         /* imaginary new state (for program structure): */
 552         /* s->state = SSL23_SR_CLNT_HELLO_C */
 553
 554         if (type == 1)
 555                 {
 556 #ifdef OPENSSL_NO_SSL2
 557                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 558                 goto err;
 559 #else
 560                 /* we are talking sslv2 */
 561                 /* we need to clean up the SSLv3/TLSv1 setup and put in the
 562                  * sslv2 stuff. */
 563
 564                 if (s->s2 == NULL)
 565                         {
 566                         if (!ssl2_new(s))
 567                                 goto err;
 568                         }
 569                 else
 570                         ssl2_clear(s);
 571
 572                 if (s->s3 != NULL) ssl3_free(s);
 573
 574                 if (!BUF_MEM_grow_clean(s->init_buf,
 575                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 576                         {
 577                         goto err;
 578                         }
 579
 580                 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
 581                 if (s->options & SSL_OP_NO_TLSv1 && s->options & SSL_OP_NO_SSLv3)
 582                         s->s2->ssl2_rollback=0;
 583                 else
 584                         /* reject SSL 2.0 session if client supports SSL 3.0 or TLS 1.0
 585                          * (SSL 3.0 draft/RFC 2246, App. E.2) */
 586                         s->s2->ssl2_rollback=1;
 587
 588                 /* setup the n bytes we have read so we get them from
 589                  * the sslv2 buffer */
 590                 s->rstate=SSL_ST_READ_HEADER;
 591                 s->packet_length=n;
 592                 s->packet= &(s->s2->rbuf[0]);
 593                 memcpy(s->packet,buf,n);
 594                 s->s2->rbuf_left=n;
 595                 s->s2->rbuf_offs=0;
 596
 597                 s->method=SSLv2_server_method();
 598                 s->handshake_func=s->method->ssl_accept;
 599 #endif
 600                 }
 601
 602         if ((type == 2) || (type == 3))
 603                 {
 604                 /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */
 605                 s->method = ssl23_get_server_method(s->version);
 606                 if (s->method == NULL)
 607                         {
 608                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 609                         goto err;
 610                         }
 611
 612                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 613
 614                 /* we are in this state */
 615                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 616
 617                 if (type == 3)
 618                         {
 619                         /* put the 'n' bytes we have read into the input buffer
 620                          * for SSLv3 */
 621                         s->rstate=SSL_ST_READ_HEADER;
 622                         s->packet_length=n;
 623                         if (s->s3->rbuf.buf == NULL)
 624                                 if (!ssl3_setup_read_buffer(s))
 625                                         goto err;
 626
 627                         s->packet= &(s->s3->rbuf.buf[0]);
 628                         memcpy(s->packet,buf,n);
 629                         s->s3->rbuf.left=n;
 630                         s->s3->rbuf.offset=0;
 631                         }
 632                 else
 633                         {
 634                         s->packet_length=0;
 635                         s->s3->rbuf.left=0;
 636                         s->s3->rbuf.offset=0;
 637                         }
 638 #if 0 /* ssl3_get_client_hello does this */
 639                 s->client_version=(v[0]<<8)|v[1];
 640 #endif
 641                 s->handshake_func=s->method->ssl_accept;
 642                 }
 643
 644         if ((type < 1) || (type > 3))
 645                 {
 646                 /* bad, very bad */
 647                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 648                 goto err;
 649                 }
 650         s->init_num=0;
 651
 652         if (buf != buf_space) OPENSSL_free(buf);
 653         return(SSL_accept(s));
 654 err:
 655         if (buf != buf_space) OPENSSL_free(buf);
 656         return(-1);
 657         }