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 <openssl/buffer.h>
 114 #include <openssl/rand.h>
 115 #include <openssl/objects.h>
 116 #include <openssl/evp.h>
 117 #include "ssl_locl.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         if (ver == SSL3_VERSION)
 128                 return(SSLv3_server_method());
 129         else if (ver == TLS1_VERSION)
 130                 return(TLSv1_server_method());
 131         else
 132                 return(NULL);
 133         }
 134
 135 SSL_METHOD *SSLv23_server_method(void)
 136         {
 137         static int init=1;
 138         static SSL_METHOD SSLv23_server_data;
 139
 140         if (init)
 141                 {
 142                 memcpy((char *)&SSLv23_server_data,
 143                         (char *)sslv23_base_method(),sizeof(SSL_METHOD));
 144                 SSLv23_server_data.ssl_accept=ssl23_accept;
 145                 SSLv23_server_data.get_ssl_method=ssl23_get_server_method;
 146                 init=0;
 147                 }
 148         return(&SSLv23_server_data);
 149         }
 150
 151 int ssl23_accept(SSL *s)
 152         {
 153         BUF_MEM *buf;
 154         unsigned long Time=time(NULL);
 155         void (*cb)()=NULL;
 156         int ret= -1;
 157         int new_state,state;
 158
 159         RAND_add(&Time,sizeof(Time),0);
 160         ERR_clear_error();
 161         clear_sys_error();
 162
 163         if (s->info_callback != NULL)
 164                 cb=s->info_callback;
 165         else if (s->ctx->info_callback != NULL)
 166                 cb=s->ctx->info_callback;
 167
 168         s->in_handshake++;
 169         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 170
 171         for (;;)
 172                 {
 173                 state=s->state;
 174
 175                 switch(s->state)
 176                         {
 177                 case SSL_ST_BEFORE:
 178                 case SSL_ST_ACCEPT:
 179                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 180                 case SSL_ST_OK|SSL_ST_ACCEPT:
 181
 182                         s->server=1;
 183                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 184
 185                         /* s->version=SSL3_VERSION; */
 186                         s->type=SSL_ST_ACCEPT;
 187
 188                         if (s->init_buf == NULL)
 189                                 {
 190                                 if ((buf=BUF_MEM_new()) == NULL)
 191                                         {
 192                                         ret= -1;
 193                                         goto end;
 194                                         }
 195                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 196                                         {
 197                                         ret= -1;
 198                                         goto end;
 199                                         }
 200                                 s->init_buf=buf;
 201                                 }
 202
 203                         ssl3_init_finished_mac(s);
 204
 205                         s->state=SSL23_ST_SR_CLNT_HELLO_A;
 206                         s->ctx->stats.sess_accept++;
 207                         s->init_num=0;
 208                         break;
 209
 210                 case SSL23_ST_SR_CLNT_HELLO_A:
 211                 case SSL23_ST_SR_CLNT_HELLO_B:
 212
 213                         s->shutdown=0;
 214                         ret=ssl23_get_client_hello(s);
 215                         if (ret >= 0) cb=NULL;
 216                         goto end;
 217                         /* break; */
 218
 219                 default:
 220                         SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
 221                         ret= -1;
 222                         goto end;
 223                         /* break; */
 224                         }
 225
 226                 if ((cb != NULL) && (s->state != state))
 227                         {
 228                         new_state=s->state;
 229                         s->state=state;
 230                         cb(s,SSL_CB_ACCEPT_LOOP,1);
 231                         s->state=new_state;
 232                         }
 233                 }
 234 end:
 235         s->in_handshake--;
 236         if (cb != NULL)
 237                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 238         return(ret);
 239         }
 240
 241
 242 int ssl23_get_client_hello(SSL *s)
 243         {
 244         char buf_space[11]; /* Request this many bytes in initial read.
 245                              * We can detect SSL 3.0/TLS 1.0 Client Hellos
 246                              * ('type == 3') correctly only when the following
 247                              * is in a single record, which is not guaranteed by
 248                              * the protocol specification:
 249                              * Byte  Content
 250                              *  0     type            \
 251                              *  1/2   version          > record header
 252                              *  3/4   length          /
 253                              *  5     msg_type        \
 254                              *  6-8   length           > Client Hello message
 255                              *  9/10  client_version  /
 256                              */
 257         char *buf= &(buf_space[0]);
 258         unsigned char *p,*d,*d_len,*dd;
 259         unsigned int i;
 260         unsigned int csl,sil,cl;
 261         int n=0,j;
 262         int type=0;
 263         int v[2];
 264 #ifndef OPENSSL_NO_RSA
 265         int use_sslv2_strong=0;
 266 #endif
 267
 268         if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
 269                 {
 270                 /* read the initial header */
 271                 v[0]=v[1]=0;
 272
 273                 if (!ssl3_setup_buffers(s)) goto err;
 274
 275                 n=ssl23_read_bytes(s, sizeof buf_space);
 276                 if (n != sizeof buf_space) return(n); /* n == -1 || n == 0 */
 277
 278                 p=s->packet;
 279
 280                 memcpy(buf,p,n);
 281
 282                 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
 283                         {
 284                         /*
 285                          * SSLv2 header
 286                          */
 287                         if ((p[3] == 0x00) && (p[4] == 0x02))
 288                                 {
 289                                 v[0]=p[3]; v[1]=p[4];
 290                                 /* SSLv2 */
 291                                 if (!(s->options & SSL_OP_NO_SSLv2))
 292                                         type=1;
 293                                 }
 294                         else if (p[3] == SSL3_VERSION_MAJOR)
 295                                 {
 296                                 v[0]=p[3]; v[1]=p[4];
 297                                 /* SSLv3/TLSv1 */
 298                                 if (p[4] >= TLS1_VERSION_MINOR)
 299                                         {
 300                                         if (!(s->options & SSL_OP_NO_TLSv1))
 301                                                 {
 302                                                 s->version=TLS1_VERSION;
 303                                                 /* type=2; */ /* done later to survive restarts */
 304                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 305                                                 }
 306                                         else if (!(s->options & SSL_OP_NO_SSLv3))
 307                                                 {
 308                                                 s->version=SSL3_VERSION;
 309                                                 /* type=2; */
 310                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 311                                                 }
 312                                         else if (!(s->options & SSL_OP_NO_SSLv2))
 313                                                 {
 314                                                 type=1;
 315                                                 }
 316                                         }
 317                                 else if (!(s->options & SSL_OP_NO_SSLv3))
 318                                         {
 319                                         s->version=SSL3_VERSION;
 320                                         /* type=2; */
 321                                         s->state=SSL23_ST_SR_CLNT_HELLO_B;
 322                                         }
 323                                 else if (!(s->options & SSL_OP_NO_SSLv2))
 324                                         type=1;
 325
 326                                 }
 327                         }
 328                 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 329                          (p[1] == SSL3_VERSION_MAJOR) &&
 330                          (p[5] == SSL3_MT_CLIENT_HELLO) &&
 331                          ((p[3] == 0 && p[4] < 5 /* silly record length? */)
 332                                 || (p[9] == p[1])))
 333                         {
 334                         /*
 335                          * SSLv3 or tls1 header
 336                          */
 337
 338                         v[0]=p[1]; /* major version (= SSL3_VERSION_MAJOR) */
 339                         /* We must look at client_version inside the Client Hello message
 340                          * to get the correct minor version.
 341                          * However if we have only a pathologically small fragment of the
 342                          * Client Hello message, this would be difficult, and we'd have
 343                          * to read more records to find out.
 344                          * No known SSL 3.0 client fragments ClientHello like this,
 345                          * so we simply assume TLS 1.0 to avoid protocol version downgrade
 346                          * attacks. */
 347                         if (p[3] == 0 && p[4] < 6)
 348                                 {
 349 #if 0
 350                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_SMALL);
 351                                 goto err;
 352 #else
 353                                 v[1] = TLS1_VERSION_MINOR;
 354 #endif
 355                                 }
 356                         else
 357                                 v[1]=p[10]; /* minor version according to client_version */
 358                         if (v[1] >= TLS1_VERSION_MINOR)
 359                                 {
 360                                 if (!(s->options & SSL_OP_NO_TLSv1))
 361                                         {
 362                                         s->version=TLS1_VERSION;
 363                                         type=3;
 364                                         }
 365                                 else if (!(s->options & SSL_OP_NO_SSLv3))
 366                                         {
 367                                         s->version=SSL3_VERSION;
 368                                         type=3;
 369                                         }
 370                                 }
 371                         else
 372                                 {
 373                                 /* client requests SSL 3.0 */
 374                                 if (!(s->options & SSL_OP_NO_SSLv3))
 375                                         {
 376                                         s->version=SSL3_VERSION;
 377                                         type=3;
 378                                         }
 379                                 else if (!(s->options & SSL_OP_NO_TLSv1))
 380                                         {
 381                                         /* we won't be able to use TLS of course,
 382                                          * but this will send an appropriate alert */
 383                                         s->version=TLS1_VERSION;
 384                                         type=3;
 385                                         }
 386                                 }
 387                         }
 388                 else if ((strncmp("GET ", (char *)p,4) == 0) ||
 389                          (strncmp("POST ",(char *)p,5) == 0) ||
 390                          (strncmp("HEAD ",(char *)p,5) == 0) ||
 391                          (strncmp("PUT ", (char *)p,4) == 0))
 392                         {
 393                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
 394                         goto err;
 395                         }
 396                 else if (strncmp("CONNECT",(char *)p,7) == 0)
 397                         {
 398                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
 399                         goto err;
 400                         }
 401                 }
 402
 403         if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
 404                 {
 405                 /* we have SSLv3/TLSv1 in an SSLv2 header
 406                  * (other cases skip this state) */
 407
 408                 type=2;
 409                 p=s->packet;
 410                 v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
 411                 v[1] = p[4];
 412
 413                 n=((p[0]&0x7f)<<8)|p[1];
 414                 if (n > (1024*4))
 415                         {
 416                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
 417                         goto err;
 418                         }
 419
 420                 j=ssl23_read_bytes(s,n+2);
 421                 if (j <= 0) return(j);
 422
 423                 ssl3_finish_mac(s,&(s->packet[2]),s->packet_length-2);
 424
 425                 p=s->packet;
 426                 p+=5;
 427                 n2s(p,csl);
 428                 n2s(p,sil);
 429                 n2s(p,cl);
 430                 d=(unsigned char *)s->init_buf->data;
 431                 if ((csl+sil+cl+11) != s->packet_length)
 432                         {
 433                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
 434                         goto err;
 435                         }
 436
 437                 /* record header: msg_type ... */
 438                 *(d++) = SSL3_MT_CLIENT_HELLO;
 439                 /* ... and length (actual value will be written later) */
 440                 d_len = d;
 441                 d += 3;
 442
 443                 /* client_version */
 444                 *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
 445                 *(d++) = v[1];
 446
 447                 /* lets populate the random area */
 448                 /* get the challenge_length */
 449                 i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
 450                 memset(d,0,SSL3_RANDOM_SIZE);
 451                 memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
 452                 d+=SSL3_RANDOM_SIZE;
 453
 454                 /* no session-id reuse */
 455                 *(d++)=0;
 456
 457                 /* ciphers */
 458                 j=0;
 459                 dd=d;
 460                 d+=2;
 461                 for (i=0; i<csl; i+=3)
 462                         {
 463                         if (p[i] != 0) continue;
 464                         *(d++)=p[i+1];
 465                         *(d++)=p[i+2];
 466                         j+=2;
 467                         }
 468                 s2n(j,dd);
 469
 470                 /* COMPRESSION */
 471                 *(d++)=1;
 472                 *(d++)=0;
 473
 474                 i=(d-(unsigned char *)s->init_buf->data);
 475                 l2n3((long)i, d_len);
 476
 477                 /* get the data reused from the init_buf */
 478                 s->s3->tmp.reuse_message=1;
 479                 s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
 480                 s->s3->tmp.message_size=i;
 481                 }
 482
 483         /* imaginary new state (for program structure): */
 484         /* s->state = SSL23_SR_CLNT_HELLO_C */
 485
 486         if (type == 1)
 487                 {
 488 #ifdef OPENSSL_NO_SSL2
 489                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 490                 goto err;
 491 #else
 492                 /* we are talking sslv2 */
 493                 /* we need to clean up the SSLv3/TLSv1 setup and put in the
 494                  * sslv2 stuff. */
 495
 496                 if (s->s2 == NULL)
 497                         {
 498                         if (!ssl2_new(s))
 499                                 goto err;
 500                         }
 501                 else
 502                         ssl2_clear(s);
 503
 504                 if (s->s3 != NULL) ssl3_free(s);
 505
 506                 if (!BUF_MEM_grow(s->init_buf,
 507                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 508                         {
 509                         goto err;
 510                         }
 511
 512                 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
 513                 if ((s->options & SSL_OP_MSIE_SSLV2_RSA_PADDING) ||
 514                         use_sslv2_strong ||
 515                         (s->options & SSL_OP_NO_TLSv1 && s->options & SSL_OP_NO_SSLv3))
 516                         s->s2->ssl2_rollback=0;
 517                 else
 518                         /* reject SSL 2.0 session if client supports SSL 3.0 or TLS 1.0
 519                          * (SSL 3.0 draft/RFC 2246, App. E.2) */
 520                         s->s2->ssl2_rollback=1;
 521
 522                 /* setup the n bytes we have read so we get them from
 523                  * the sslv2 buffer */
 524                 s->rstate=SSL_ST_READ_HEADER;
 525                 s->packet_length=n;
 526                 s->packet= &(s->s2->rbuf[0]);
 527                 memcpy(s->packet,buf,n);
 528                 s->s2->rbuf_left=n;
 529                 s->s2->rbuf_offs=0;
 530
 531                 s->method=SSLv2_server_method();
 532                 s->handshake_func=s->method->ssl_accept;
 533 #endif
 534                 }
 535
 536         if ((type == 2) || (type == 3))
 537                 {
 538                 /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */
 539
 540                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 541
 542                 /* we are in this state */
 543                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 544
 545                 if (type == 3)
 546                         {
 547                         /* put the 'n' bytes we have read into the input buffer
 548                          * for SSLv3 */
 549                         s->rstate=SSL_ST_READ_HEADER;
 550                         s->packet_length=n;
 551                         s->packet= &(s->s3->rbuf.buf[0]);
 552                         memcpy(s->packet,buf,n);
 553                         s->s3->rbuf.left=n;
 554                         s->s3->rbuf.offset=0;
 555                         }
 556                 else
 557                         {
 558                         s->packet_length=0;
 559                         s->s3->rbuf.left=0;
 560                         s->s3->rbuf.offset=0;
 561                         }
 562
 563                 if (s->version == TLS1_VERSION)
 564                         s->method = TLSv1_server_method();
 565                 else
 566                         s->method = SSLv3_server_method();
 567 #if 0 /* ssl3_get_client_hello does this */
 568                 s->client_version=(v[0]<<8)|v[1];
 569 #endif
 570                 s->handshake_func=s->method->ssl_accept;
 571                 }
 572
 573         if ((type < 1) || (type > 3))
 574                 {
 575                 /* bad, very bad */
 576                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 577                 goto err;
 578                 }
 579         s->init_num=0;
 580
 581         if (buf != buf_space) OPENSSL_free(buf);
 582         s->first_packet=1;
 583         return(SSL_accept(s));
 584 err:
 585         if (buf != buf_space) OPENSSL_free(buf);
 586         return(-1);
 587         }