ssl/d1_clnt.c

   1 /* ssl/d1_clnt.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2007 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #include <openssl/buffer.h>
 119 #include <openssl/rand.h>
 120 #include <openssl/objects.h>
 121 #include <openssl/evp.h>
 122 #include <openssl/md5.h>
 123 #ifndef OPENSSL_NO_DH
 124 #include <openssl/dh.h>
 125 #endif
 126
 127 static const SSL_METHOD *dtls1_get_client_method(int ver);
 128 static int dtls1_get_hello_verify(SSL *s);
 129
 130 static const SSL_METHOD *dtls1_get_client_method(int ver)
 131         {
 132         if (ver == DTLS1_VERSION)
 133                 return(DTLSv1_client_method());
 134         else
 135                 return(NULL);
 136         }
 137
 138 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
 139                         ssl_undefined_function,
 140                         dtls1_connect,
 141                         dtls1_get_client_method)
 142
 143 int dtls1_connect(SSL *s)
 144         {
 145         BUF_MEM *buf=NULL;
 146         unsigned long Time=(unsigned long)time(NULL);
 147         long num1;
 148         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 149         int ret= -1;
 150         int new_state,state,skip=0;;
 151
 152         RAND_add(&Time,sizeof(Time),0);
 153         ERR_clear_error();
 154         clear_sys_error();
 155
 156         if (s->info_callback != NULL)
 157                 cb=s->info_callback;
 158         else if (s->ctx->info_callback != NULL)
 159                 cb=s->ctx->info_callback;
 160
 161         s->in_handshake++;
 162         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 163
 164         for (;;)
 165                 {
 166                 state=s->state;
 167
 168                 switch(s->state)
 169                         {
 170                 case SSL_ST_RENEGOTIATE:
 171                         s->new_session=1;
 172                         s->state=SSL_ST_CONNECT;
 173                         s->ctx->stats.sess_connect_renegotiate++;
 174                         /* break */
 175                 case SSL_ST_BEFORE:
 176                 case SSL_ST_CONNECT:
 177                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 178                 case SSL_ST_OK|SSL_ST_CONNECT:
 179
 180                         s->server=0;
 181                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 182
 183                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00))
 184                                 {
 185                                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 186                                 ret = -1;
 187                                 goto end;
 188                                 }
 189
 190                         /* s->version=SSL3_VERSION; */
 191                         s->type=SSL_ST_CONNECT;
 192
 193                         if (s->init_buf == NULL)
 194                                 {
 195                                 if ((buf=BUF_MEM_new()) == NULL)
 196                                         {
 197                                         ret= -1;
 198                                         goto end;
 199                                         }
 200                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 201                                         {
 202                                         ret= -1;
 203                                         goto end;
 204                                         }
 205                                 s->init_buf=buf;
 206                                 buf=NULL;
 207                                 }
 208
 209                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 210
 211                         /* setup buffing BIO */
 212                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 213
 214                         /* don't push the buffering BIO quite yet */
 215
 216                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 217                         s->ctx->stats.sess_connect++;
 218                         s->init_num=0;
 219                         /* mark client_random uninitialized */
 220                         memset(s->s3->client_random,0,sizeof(s->s3->client_random));
 221                         break;
 222
 223                 case SSL3_ST_CW_CLNT_HELLO_A:
 224                 case SSL3_ST_CW_CLNT_HELLO_B:
 225
 226                         s->shutdown=0;
 227
 228                         /* every DTLS ClientHello resets Finished MAC */
 229                         ssl3_init_finished_mac(s);
 230
 231                         ret=dtls1_client_hello(s);
 232                         if (ret <= 0) goto end;
 233
 234                         if ( s->d1->send_cookie)
 235                                 {
 236                                 s->state=SSL3_ST_CW_FLUSH;
 237                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 238                                 }
 239                         else
 240                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 241
 242                         s->init_num=0;
 243
 244                         /* turn on buffering for the next lot of output */
 245                         if (s->bbio != s->wbio)
 246                                 s->wbio=BIO_push(s->bbio,s->wbio);
 247
 248                         break;
 249
 250                 case SSL3_ST_CR_SRVR_HELLO_A:
 251                 case SSL3_ST_CR_SRVR_HELLO_B:
 252                         ret=ssl3_get_server_hello(s);
 253                         if (ret <= 0) goto end;
 254                         else
 255                                 {
 256                                 if (s->hit)
 257                                         s->state=SSL3_ST_CR_FINISHED_A;
 258                                 else
 259                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 260                                 }
 261                         s->init_num=0;
 262                         break;
 263
 264                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 265                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 266
 267                         ret = dtls1_get_hello_verify(s);
 268                         if ( ret <= 0)
 269                                 goto end;
 270                         if ( s->d1->send_cookie) /* start again, with a cookie */
 271                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 272                         else
 273                                 s->state = SSL3_ST_CR_CERT_A;
 274                         s->init_num = 0;
 275                         break;
 276
 277                 case SSL3_ST_CR_CERT_A:
 278                 case SSL3_ST_CR_CERT_B:
 279                         /* Check if it is anon DH */
 280                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
 281                                 {
 282                                 ret=ssl3_get_server_certificate(s);
 283                                 if (ret <= 0) goto end;
 284                                 }
 285                         else
 286                                 skip=1;
 287                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 288                         s->init_num=0;
 289                         break;
 290
 291                 case SSL3_ST_CR_KEY_EXCH_A:
 292                 case SSL3_ST_CR_KEY_EXCH_B:
 293                         ret=ssl3_get_key_exchange(s);
 294                         if (ret <= 0) goto end;
 295                         s->state=SSL3_ST_CR_CERT_REQ_A;
 296                         s->init_num=0;
 297
 298                         /* at this point we check that we have the
 299                          * required stuff from the server */
 300                         if (!ssl3_check_cert_and_algorithm(s))
 301                                 {
 302                                 ret= -1;
 303                                 goto end;
 304                                 }
 305                         break;
 306
 307                 case SSL3_ST_CR_CERT_REQ_A:
 308                 case SSL3_ST_CR_CERT_REQ_B:
 309                         ret=ssl3_get_certificate_request(s);
 310                         if (ret <= 0) goto end;
 311                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 312                         s->init_num=0;
 313                         break;
 314
 315                 case SSL3_ST_CR_SRVR_DONE_A:
 316                 case SSL3_ST_CR_SRVR_DONE_B:
 317                         ret=ssl3_get_server_done(s);
 318                         if (ret <= 0) goto end;
 319                         if (s->s3->tmp.cert_req)
 320                                 s->state=SSL3_ST_CW_CERT_A;
 321                         else
 322                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 323                         s->init_num=0;
 324
 325                         break;
 326
 327                 case SSL3_ST_CW_CERT_A:
 328                 case SSL3_ST_CW_CERT_B:
 329                 case SSL3_ST_CW_CERT_C:
 330                 case SSL3_ST_CW_CERT_D:
 331                         ret=dtls1_send_client_certificate(s);
 332                         if (ret <= 0) goto end;
 333                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 334                         s->init_num=0;
 335                         break;
 336
 337                 case SSL3_ST_CW_KEY_EXCH_A:
 338                 case SSL3_ST_CW_KEY_EXCH_B:
 339                         ret=dtls1_send_client_key_exchange(s);
 340                         if (ret <= 0) goto end;
 341                         /* EAY EAY EAY need to check for DH fix cert
 342                          * sent back */
 343                         /* For TLS, cert_req is set to 2, so a cert chain
 344                          * of nothing is sent, but no verify packet is sent */
 345                         if (s->s3->tmp.cert_req == 1)
 346                                 {
 347                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 348                                 }
 349                         else
 350                                 {
 351                                 s->state=SSL3_ST_CW_CHANGE_A;
 352                                 s->s3->change_cipher_spec=0;
 353                                 }
 354
 355                         s->init_num=0;
 356                         break;
 357
 358                 case SSL3_ST_CW_CERT_VRFY_A:
 359                 case SSL3_ST_CW_CERT_VRFY_B:
 360                         ret=dtls1_send_client_verify(s);
 361                         if (ret <= 0) goto end;
 362                         s->state=SSL3_ST_CW_CHANGE_A;
 363                         s->init_num=0;
 364                         s->s3->change_cipher_spec=0;
 365                         break;
 366
 367                 case SSL3_ST_CW_CHANGE_A:
 368                 case SSL3_ST_CW_CHANGE_B:
 369                         ret=dtls1_send_change_cipher_spec(s,
 370                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 371                         if (ret <= 0) goto end;
 372                         s->state=SSL3_ST_CW_FINISHED_A;
 373                         s->init_num=0;
 374
 375                         s->session->cipher=s->s3->tmp.new_cipher;
 376 #ifdef OPENSSL_NO_COMP
 377                         s->session->compress_meth=0;
 378 #else
 379                         if (s->s3->tmp.new_compression == NULL)
 380                                 s->session->compress_meth=0;
 381                         else
 382                                 s->session->compress_meth=
 383                                         s->s3->tmp.new_compression->id;
 384 #endif
 385                         if (!s->method->ssl3_enc->setup_key_block(s))
 386                                 {
 387                                 ret= -1;
 388                                 goto end;
 389                                 }
 390
 391                         if (!s->method->ssl3_enc->change_cipher_state(s,
 392                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 393                                 {
 394                                 ret= -1;
 395                                 goto end;
 396                                 }
 397
 398                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 399                         break;
 400
 401                 case SSL3_ST_CW_FINISHED_A:
 402                 case SSL3_ST_CW_FINISHED_B:
 403                         ret=dtls1_send_finished(s,
 404                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 405                                 s->method->ssl3_enc->client_finished_label,
 406                                 s->method->ssl3_enc->client_finished_label_len);
 407                         if (ret <= 0) goto end;
 408                         s->state=SSL3_ST_CW_FLUSH;
 409
 410                         /* clear flags */
 411                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 412                         if (s->hit)
 413                                 {
 414                                 s->s3->tmp.next_state=SSL_ST_OK;
 415                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 416                                         {
 417                                         s->state=SSL_ST_OK;
 418                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 419                                         s->s3->delay_buf_pop_ret=0;
 420                                         }
 421                                 }
 422                         else
 423                                 {
 424                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 425                                 }
 426                         s->init_num=0;
 427                         /* mark client_random uninitialized */
 428                         memset (s->s3->client_random,0,sizeof(s->s3->client_random));
 429                         break;
 430
 431                 case SSL3_ST_CR_FINISHED_A:
 432                 case SSL3_ST_CR_FINISHED_B:
 433
 434                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 435                                 SSL3_ST_CR_FINISHED_B);
 436                         if (ret <= 0) goto end;
 437
 438                         if (s->hit)
 439                                 s->state=SSL3_ST_CW_CHANGE_A;
 440                         else
 441                                 s->state=SSL_ST_OK;
 442                         s->init_num=0;
 443                         break;
 444
 445                 case SSL3_ST_CW_FLUSH:
 446                         /* number of bytes to be flushed */
 447                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 448                         if (num1 > 0)
 449                                 {
 450                                 s->rwstate=SSL_WRITING;
 451                                 num1=BIO_flush(s->wbio);
 452                                 if (num1 <= 0) { ret= -1; goto end; }
 453                                 s->rwstate=SSL_NOTHING;
 454                                 }
 455
 456                         s->state=s->s3->tmp.next_state;
 457                         break;
 458
 459                 case SSL_ST_OK:
 460                         /* clean a few things up */
 461                         ssl3_cleanup_key_block(s);
 462
 463 #if 0
 464                         if (s->init_buf != NULL)
 465                                 {
 466                                 BUF_MEM_free(s->init_buf);
 467                                 s->init_buf=NULL;
 468                                 }
 469 #endif
 470
 471                         /* If we are not 'joining' the last two packets,
 472                          * remove the buffering now */
 473                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 474                                 ssl_free_wbio_buffer(s);
 475                         /* else do it later in ssl3_write */
 476
 477                         s->init_num=0;
 478                         s->new_session=0;
 479
 480                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 481                         if (s->hit) s->ctx->stats.sess_hit++;
 482
 483                         ret=1;
 484                         /* s->server=0; */
 485                         s->handshake_func=dtls1_connect;
 486                         s->ctx->stats.sess_connect_good++;
 487
 488                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 489
 490                         /* done with handshaking */
 491                         s->d1->handshake_read_seq  = 0;
 492                         goto end;
 493                         /* break; */
 494
 495                 default:
 496                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 497                         ret= -1;
 498                         goto end;
 499                         /* break; */
 500                         }
 501
 502                 /* did we do anything */
 503                 if (!s->s3->tmp.reuse_message && !skip)
 504                         {
 505                         if (s->debug)
 506                                 {
 507                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 508                                         goto end;
 509                                 }
 510
 511                         if ((cb != NULL) && (s->state != state))
 512                                 {
 513                                 new_state=s->state;
 514                                 s->state=state;
 515                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 516                                 s->state=new_state;
 517                                 }
 518                         }
 519                 skip=0;
 520                 }
 521 end:
 522         s->in_handshake--;
 523         if (buf != NULL)
 524                 BUF_MEM_free(buf);
 525         if (cb != NULL)
 526                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 527         return(ret);
 528         }
 529
 530 int dtls1_client_hello(SSL *s)
 531         {
 532         unsigned char *buf;
 533         unsigned char *p,*d;
 534         unsigned int i,j;
 535         unsigned long Time,l;
 536         SSL_COMP *comp;
 537
 538         buf=(unsigned char *)s->init_buf->data;
 539         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 540                 {
 541                 if ((s->session == NULL) ||
 542                         (s->session->ssl_version != s->version) ||
 543                         (s->session->not_resumable))
 544                         {
 545                         if (!ssl_get_new_session(s,0))
 546                                 goto err;
 547                         }
 548                 /* else use the pre-loaded session */
 549
 550                 p=s->s3->client_random;
 551
 552                 /* if client_random is initialized, reuse it, we are
 553                  * required to use same upon reply to HelloVerify */
 554                 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
 555                 if (i==sizeof(s->s3->client_random))
 556                         {
 557                         Time=(unsigned long)time(NULL); /* Time */
 558                         l2n(Time,p);
 559                         RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4);
 560                         }
 561
 562                 /* Do the message type and length last */
 563                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 564
 565                 *(p++)=s->version>>8;
 566                 *(p++)=s->version&0xff;
 567                 s->client_version=s->version;
 568
 569                 /* Random stuff */
 570                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 571                 p+=SSL3_RANDOM_SIZE;
 572
 573                 /* Session ID */
 574                 if (s->new_session)
 575                         i=0;
 576                 else
 577                         i=s->session->session_id_length;
 578                 *(p++)=i;
 579                 if (i != 0)
 580                         {
 581                         if (i > sizeof s->session->session_id)
 582                                 {
 583                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 584                                 goto err;
 585                                 }
 586                         memcpy(p,s->session->session_id,i);
 587                         p+=i;
 588                         }
 589
 590                 /* cookie stuff */
 591                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 592                         {
 593                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 594                         goto err;
 595                         }
 596                 *(p++) = s->d1->cookie_len;
 597                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 598                 p += s->d1->cookie_len;
 599
 600                 /* Ciphers supported */
 601                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 602                 if (i == 0)
 603                         {
 604                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 605                         goto err;
 606                         }
 607                 s2n(i,p);
 608                 p+=i;
 609
 610                 /* COMPRESSION */
 611                 if (s->ctx->comp_methods == NULL)
 612                         j=0;
 613                 else
 614                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 615                 *(p++)=1+j;
 616                 for (i=0; i<j; i++)
 617                         {
 618                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 619                         *(p++)=comp->id;
 620                         }
 621                 *(p++)=0; /* Add the NULL method */
 622
 623                 l=(p-d);
 624                 d=buf;
 625
 626                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 627
 628                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 629                 /* number of bytes to write */
 630                 s->init_num=p-buf;
 631                 s->init_off=0;
 632
 633                 /* buffer the message to handle re-xmits */
 634                 dtls1_buffer_message(s, 0);
 635                 }
 636
 637         /* SSL3_ST_CW_CLNT_HELLO_B */
 638         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 639 err:
 640         return(-1);
 641         }
 642
 643 static int dtls1_get_hello_verify(SSL *s)
 644         {
 645         int n, al, ok = 0;
 646         unsigned char *data;
 647         unsigned int cookie_len;
 648
 649         n=s->method->ssl_get_message(s,
 650                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 651                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 652                 -1,
 653                 s->max_cert_list,
 654                 &ok);
 655
 656         if (!ok) return((int)n);
 657
 658         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 659                 {
 660                 s->d1->send_cookie = 0;
 661                 s->s3->tmp.reuse_message=1;
 662                 return(1);
 663                 }
 664
 665         data = (unsigned char *)s->init_msg;
 666
 667         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 668                 {
 669                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 670                 s->version=(s->version&0xff00)|data[1];
 671                 al = SSL_AD_PROTOCOL_VERSION;
 672                 goto f_err;
 673                 }
 674         data+=2;
 675
 676         cookie_len = *(data++);
 677         if ( cookie_len > sizeof(s->d1->cookie))
 678                 {
 679                 al=SSL_AD_ILLEGAL_PARAMETER;
 680                 goto f_err;
 681                 }
 682
 683         memcpy(s->d1->cookie, data, cookie_len);
 684         s->d1->cookie_len = cookie_len;
 685
 686         s->d1->send_cookie = 1;
 687         return 1;
 688
 689 f_err:
 690         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 691         return -1;
 692         }
 693
 694 int dtls1_send_client_key_exchange(SSL *s)
 695         {
 696         unsigned char *p,*d;
 697         int n;
 698         unsigned long alg_k;
 699 #ifndef OPENSSL_NO_RSA
 700         unsigned char *q;
 701         EVP_PKEY *pkey=NULL;
 702 #endif
 703 #ifndef OPENSSL_NO_KRB5
 704         KSSL_ERR kssl_err;
 705 #endif /* OPENSSL_NO_KRB5 */
 706
 707         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
 708                 {
 709                 d=(unsigned char *)s->init_buf->data;
 710                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 711
 712                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
 713
 714                 /* Fool emacs indentation */
 715                 if (0) {}
 716 #ifndef OPENSSL_NO_RSA
 717                 else if (alg_k & SSL_kRSA)
 718                         {
 719                         RSA *rsa;
 720                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 721
 722                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
 723                                 rsa=s->session->sess_cert->peer_rsa_tmp;
 724                         else
 725                                 {
 726                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 727                                 if ((pkey == NULL) ||
 728                                         (pkey->type != EVP_PKEY_RSA) ||
 729                                         (pkey->pkey.rsa == NULL))
 730                                         {
 731                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 732                                         goto err;
 733                                         }
 734                                 rsa=pkey->pkey.rsa;
 735                                 EVP_PKEY_free(pkey);
 736                                 }
 737
 738                         tmp_buf[0]=s->client_version>>8;
 739                         tmp_buf[1]=s->client_version&0xff;
 740                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
 741                                         goto err;
 742
 743                         s->session->master_key_length=sizeof tmp_buf;
 744
 745                         q=p;
 746                         /* Fix buf for TLS and [incidentally] DTLS */
 747                         if (s->version > SSL3_VERSION)
 748                                 p+=2;
 749                         n=RSA_public_encrypt(sizeof tmp_buf,
 750                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
 751 #ifdef PKCS1_CHECK
 752                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
 753                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
 754 #endif
 755                         if (n <= 0)
 756                                 {
 757                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
 758                                 goto err;
 759                                 }
 760
 761                         /* Fix buf for TLS and [incidentally] DTLS */
 762                         if (s->version > SSL3_VERSION)
 763                                 {
 764                                 s2n(n,q);
 765                                 n+=2;
 766                                 }
 767
 768                         s->session->master_key_length=
 769                                 s->method->ssl3_enc->generate_master_secret(s,
 770                                         s->session->master_key,
 771                                         tmp_buf,sizeof tmp_buf);
 772                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
 773                         }
 774 #endif
 775 #ifndef OPENSSL_NO_KRB5
 776                 else if (alg_k & SSL_kKRB5)
 777                         {
 778                         krb5_error_code krb5rc;
 779                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
 780                         /*  krb5_data   krb5_ap_req;  */
 781                         krb5_data       *enc_ticket;
 782                         krb5_data       authenticator, *authp = NULL;
 783                         EVP_CIPHER_CTX  ciph_ctx;
 784                         EVP_CIPHER      *enc = NULL;
 785                         unsigned char   iv[EVP_MAX_IV_LENGTH];
 786                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 787                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
 788                                                 + EVP_MAX_IV_LENGTH];
 789                         int             padl, outl = sizeof(epms);
 790
 791                         EVP_CIPHER_CTX_init(&ciph_ctx);
 792
 793 #ifdef KSSL_DEBUG
 794                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
 795                                 alg_k, SSL_kKRB5);
 796 #endif  /* KSSL_DEBUG */
 797
 798                         authp = NULL;
 799 #ifdef KRB5SENDAUTH
 800                         if (KRB5SENDAUTH)  authp = &authenticator;
 801 #endif  /* KRB5SENDAUTH */
 802
 803                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
 804                                 &kssl_err);
 805                         enc = kssl_map_enc(kssl_ctx->enctype);
 806                         if (enc == NULL)
 807                             goto err;
 808 #ifdef KSSL_DEBUG
 809                         {
 810                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
 811                         if (krb5rc && kssl_err.text)
 812                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
 813                         }
 814 #endif  /* KSSL_DEBUG */
 815
 816                         if (krb5rc)
 817                                 {
 818                                 ssl3_send_alert(s,SSL3_AL_FATAL,
 819                                                 SSL_AD_HANDSHAKE_FAILURE);
 820                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 821                                                 kssl_err.reason);
 822                                 goto err;
 823                                 }
 824
 825                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
 826                         **  in place of RFC 2712 KerberosWrapper, as in:
 827                         **
 828                         **  Send ticket (copy to *p, set n = length)
 829                         **  n = krb5_ap_req.length;
 830                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
 831                         **  if (krb5_ap_req.data)
 832                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
 833                         **
 834                         **  Now using real RFC 2712 KerberosWrapper
 835                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
 836                         **  Note: 2712 "opaque" types are here replaced
 837                         **  with a 2-byte length followed by the value.
 838                         **  Example:
 839                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
 840                         **  Where "xx xx" = length bytes.  Shown here with
 841                         **  optional authenticator omitted.
 842                         */
 843
 844                         /*  KerberosWrapper.Ticket              */
 845                         s2n(enc_ticket->length,p);
 846                         memcpy(p, enc_ticket->data, enc_ticket->length);
 847                         p+= enc_ticket->length;
 848                         n = enc_ticket->length + 2;
 849
 850                         /*  KerberosWrapper.Authenticator       */
 851                         if (authp  &&  authp->length)
 852                                 {
 853                                 s2n(authp->length,p);
 854                                 memcpy(p, authp->data, authp->length);
 855                                 p+= authp->length;
 856                                 n+= authp->length + 2;
 857
 858                                 free(authp->data);
 859                                 authp->data = NULL;
 860                                 authp->length = 0;
 861                                 }
 862                         else
 863                                 {
 864                                 s2n(0,p);/*  null authenticator length  */
 865                                 n+=2;
 866                                 }
 867
 868                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
 869                             goto err;
 870
 871                         /*  20010420 VRS.  Tried it this way; failed.
 872                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
 873                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
 874                         **                              kssl_ctx->length);
 875                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
 876                         */
 877
 878                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
 879                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
 880                                 kssl_ctx->key,iv);
 881                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
 882                                 sizeof tmp_buf);
 883                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
 884                         outl += padl;
 885                         if (outl > sizeof epms)
 886                                 {
 887                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 888                                 goto err;
 889                                 }
 890                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
 891
 892                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
 893                         s2n(outl,p);
 894                         memcpy(p, epms, outl);
 895                         p+=outl;
 896                         n+=outl + 2;
 897
 898                         s->session->master_key_length=
 899                                 s->method->ssl3_enc->generate_master_secret(s,
 900                                         s->session->master_key,
 901                                         tmp_buf, sizeof tmp_buf);
 902
 903                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
 904                         OPENSSL_cleanse(epms, outl);
 905                         }
 906 #endif
 907 #ifndef OPENSSL_NO_DH
 908                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 909                         {
 910                         DH *dh_srvr,*dh_clnt;
 911
 912                         if (s->session->sess_cert->peer_dh_tmp != NULL)
 913                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
 914                         else
 915                                 {
 916                                 /* we get them from the cert */
 917                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 918                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
 919                                 goto err;
 920                                 }
 921
 922                         /* generate a new random key */
 923                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
 924                                 {
 925                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 926                                 goto err;
 927                                 }
 928                         if (!DH_generate_key(dh_clnt))
 929                                 {
 930                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 931                                 goto err;
 932                                 }
 933
 934                         /* use the 'p' output buffer for the DH key, but
 935                          * make sure to clear it out afterwards */
 936
 937                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
 938
 939                         if (n <= 0)
 940                                 {
 941                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 942                                 goto err;
 943                                 }
 944
 945                         /* generate master key from the result */
 946                         s->session->master_key_length=
 947                                 s->method->ssl3_enc->generate_master_secret(s,
 948                                         s->session->master_key,p,n);
 949                         /* clean up */
 950                         memset(p,0,n);
 951
 952                         /* send off the data */
 953                         n=BN_num_bytes(dh_clnt->pub_key);
 954                         s2n(n,p);
 955                         BN_bn2bin(dh_clnt->pub_key,p);
 956                         n+=2;
 957
 958                         DH_free(dh_clnt);
 959
 960                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
 961                         }
 962 #endif
 963                 else
 964                         {
 965                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 966                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 967                         goto err;
 968                         }
 969
 970                 d = dtls1_set_message_header(s, d,
 971                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
 972                 /*
 973                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
 974                  l2n3(n,d);
 975                  l2n(s->d1->handshake_write_seq,d);
 976                  s->d1->handshake_write_seq++;
 977                 */
 978
 979                 s->state=SSL3_ST_CW_KEY_EXCH_B;
 980                 /* number of bytes to write */
 981                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
 982                 s->init_off=0;
 983
 984                 /* buffer the message to handle re-xmits */
 985                 dtls1_buffer_message(s, 0);
 986                 }
 987
 988         /* SSL3_ST_CW_KEY_EXCH_B */
 989         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 990 err:
 991         return(-1);
 992         }
 993
 994 int dtls1_send_client_verify(SSL *s)
 995         {
 996         unsigned char *p,*d;
 997         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 998         EVP_PKEY *pkey;
 999 #ifndef OPENSSL_NO_RSA
1000         unsigned u=0;
1001 #endif
1002         unsigned long n;
1003 #ifndef OPENSSL_NO_DSA
1004         int j;
1005 #endif
1006
1007         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1008                 {
1009                 d=(unsigned char *)s->init_buf->data;
1010                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1011                 pkey=s->cert->key->privatekey;
1012
1013                 s->method->ssl3_enc->cert_verify_mac(s,
1014                 NID_sha1,
1015                         &(data[MD5_DIGEST_LENGTH]));
1016
1017 #ifndef OPENSSL_NO_RSA
1018                 if (pkey->type == EVP_PKEY_RSA)
1019                         {
1020                         s->method->ssl3_enc->cert_verify_mac(s,
1021                                 NID_md5,
1022                                 &(data[0]));
1023                         if (RSA_sign(NID_md5_sha1, data,
1024                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1025                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1026                                 {
1027                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1028                                 goto err;
1029                                 }
1030                         s2n(u,p);
1031                         n=u+2;
1032                         }
1033                 else
1034 #endif
1035 #ifndef OPENSSL_NO_DSA
1036                         if (pkey->type == EVP_PKEY_DSA)
1037                         {
1038                         if (!DSA_sign(pkey->save_type,
1039                                 &(data[MD5_DIGEST_LENGTH]),
1040                                 SHA_DIGEST_LENGTH,&(p[2]),
1041                                 (unsigned int *)&j,pkey->pkey.dsa))
1042                                 {
1043                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1044                                 goto err;
1045                                 }
1046                         s2n(j,p);
1047                         n=j+2;
1048                         }
1049                 else
1050 #endif
1051                         {
1052                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1053                         goto err;
1054                         }
1055
1056                 d = dtls1_set_message_header(s, d,
1057                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1058
1059                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1060                 s->init_off=0;
1061
1062                 /* buffer the message to handle re-xmits */
1063                 dtls1_buffer_message(s, 0);
1064
1065                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1066                 }
1067
1068         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1069         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1070 err:
1071         return(-1);
1072         }
1073
1074 int dtls1_send_client_certificate(SSL *s)
1075         {
1076         X509 *x509=NULL;
1077         EVP_PKEY *pkey=NULL;
1078         int i;
1079         unsigned long l;
1080
1081         if (s->state == SSL3_ST_CW_CERT_A)
1082                 {
1083                 if ((s->cert == NULL) ||
1084                         (s->cert->key->x509 == NULL) ||
1085                         (s->cert->key->privatekey == NULL))
1086                         s->state=SSL3_ST_CW_CERT_B;
1087                 else
1088                         s->state=SSL3_ST_CW_CERT_C;
1089                 }
1090
1091         /* We need to get a client cert */
1092         if (s->state == SSL3_ST_CW_CERT_B)
1093                 {
1094                 /* If we get an error, we need to
1095                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1096                  * We then get retied later */
1097                 i=0;
1098                 if (s->ctx->client_cert_cb != NULL)
1099                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1100                 if (i < 0)
1101                         {
1102                         s->rwstate=SSL_X509_LOOKUP;
1103                         return(-1);
1104                         }
1105                 s->rwstate=SSL_NOTHING;
1106                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1107                         {
1108                         s->state=SSL3_ST_CW_CERT_B;
1109                         if (    !SSL_use_certificate(s,x509) ||
1110                                 !SSL_use_PrivateKey(s,pkey))
1111                                 i=0;
1112                         }
1113                 else if (i == 1)
1114                         {
1115                         i=0;
1116                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1117                         }
1118
1119                 if (x509 != NULL) X509_free(x509);
1120                 if (pkey != NULL) EVP_PKEY_free(pkey);
1121                 if (i == 0)
1122                         {
1123                         if (s->version == SSL3_VERSION)
1124                                 {
1125                                 s->s3->tmp.cert_req=0;
1126                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1127                                 return(1);
1128                                 }
1129                         else
1130                                 {
1131                                 s->s3->tmp.cert_req=2;
1132                                 }
1133                         }
1134
1135                 /* Ok, we have a cert */
1136                 s->state=SSL3_ST_CW_CERT_C;
1137                 }
1138
1139         if (s->state == SSL3_ST_CW_CERT_C)
1140                 {
1141                 s->state=SSL3_ST_CW_CERT_D;
1142                 l=dtls1_output_cert_chain(s,
1143                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1144                 s->init_num=(int)l;
1145                 s->init_off=0;
1146
1147                 /* set header called by dtls1_output_cert_chain() */
1148
1149                 /* buffer the message to handle re-xmits */
1150                 dtls1_buffer_message(s, 0);
1151                 }
1152         /* SSL3_ST_CW_CERT_D */
1153         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1154         }
1155
1156