crypto/openssl-0.9/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) 1999-2005 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 "kssl_lcl.h"
 119 #include <openssl/buffer.h>
 120 #include <openssl/rand.h>
 121 #include <openssl/objects.h>
 122 #include <openssl/evp.h>
 123 #include <openssl/md5.h>
 124 #ifndef OPENSSL_NO_DH
 125 #include <openssl/dh.h>
 126 #endif
 127
 128 static SSL_METHOD *dtls1_get_client_method(int ver);
 129 static int dtls1_get_hello_verify(SSL *s);
 130
 131 static SSL_METHOD *dtls1_get_client_method(int ver)
 132         {
 133         if (ver == DTLS1_VERSION)
 134                 return(DTLSv1_client_method());
 135         else
 136                 return(NULL);
 137         }
 138
 139 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
 140                         ssl_undefined_function,
 141                         dtls1_connect,
 142                         dtls1_get_client_method)
 143
 144 int dtls1_connect(SSL *s)
 145         {
 146         BUF_MEM *buf=NULL;
 147         unsigned long Time=(unsigned long)time(NULL),l;
 148         long num1;
 149         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 150         int ret= -1;
 151         int new_state,state,skip=0;;
 152
 153         RAND_add(&Time,sizeof(Time),0);
 154         ERR_clear_error();
 155         clear_sys_error();
 156
 157         if (s->info_callback != NULL)
 158                 cb=s->info_callback;
 159         else if (s->ctx->info_callback != NULL)
 160                 cb=s->ctx->info_callback;
 161
 162         s->in_handshake++;
 163         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 164
 165         for (;;)
 166                 {
 167                 state=s->state;
 168
 169                 switch(s->state)
 170                         {
 171                 case SSL_ST_RENEGOTIATE:
 172                         s->new_session=1;
 173                         s->state=SSL_ST_CONNECT;
 174                         s->ctx->stats.sess_connect_renegotiate++;
 175                         /* break */
 176                 case SSL_ST_BEFORE:
 177                 case SSL_ST_CONNECT:
 178                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 179                 case SSL_ST_OK|SSL_ST_CONNECT:
 180
 181                         s->server=0;
 182                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 183
 184                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00))
 185                                 {
 186                                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 187                                 ret = -1;
 188                                 goto end;
 189                                 }
 190
 191                         /* s->version=SSL3_VERSION; */
 192                         s->type=SSL_ST_CONNECT;
 193
 194                         if (s->init_buf == NULL)
 195                                 {
 196                                 if ((buf=BUF_MEM_new()) == NULL)
 197                                         {
 198                                         ret= -1;
 199                                         goto end;
 200                                         }
 201                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 202                                         {
 203                                         ret= -1;
 204                                         goto end;
 205                                         }
 206                                 s->init_buf=buf;
 207                                 buf=NULL;
 208                                 }
 209
 210                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 211
 212                         /* setup buffing BIO */
 213                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 214
 215                         /* don't push the buffering BIO quite yet */
 216
 217                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 218                         s->ctx->stats.sess_connect++;
 219                         s->init_num=0;
 220                         /* mark client_random uninitialized */
 221                         memset(s->s3->client_random,0,sizeof(s->s3->client_random));
 222                         break;
 223
 224                 case SSL3_ST_CW_CLNT_HELLO_A:
 225                 case SSL3_ST_CW_CLNT_HELLO_B:
 226
 227                         s->shutdown=0;
 228
 229                         /* every DTLS ClientHello resets Finished MAC */
 230                         ssl3_init_finished_mac(s);
 231
 232                         ret=dtls1_client_hello(s);
 233                         if (ret <= 0) goto end;
 234
 235                         if ( s->d1->send_cookie)
 236                                 {
 237                                 s->state=SSL3_ST_CW_FLUSH;
 238                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 239                                 }
 240                         else
 241                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 242
 243                         s->init_num=0;
 244
 245                         /* turn on buffering for the next lot of output */
 246                         if (s->bbio != s->wbio)
 247                                 s->wbio=BIO_push(s->bbio,s->wbio);
 248
 249                         break;
 250
 251                 case SSL3_ST_CR_SRVR_HELLO_A:
 252                 case SSL3_ST_CR_SRVR_HELLO_B:
 253                         ret=ssl3_get_server_hello(s);
 254                         if (ret <= 0) goto end;
 255                         else
 256                                 {
 257                                 if (s->hit)
 258                                         s->state=SSL3_ST_CR_FINISHED_A;
 259                                 else
 260                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 261                                 }
 262                         s->init_num=0;
 263                         break;
 264
 265                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 266                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 267
 268                         ret = dtls1_get_hello_verify(s);
 269                         if ( ret <= 0)
 270                                 goto end;
 271                         if ( s->d1->send_cookie) /* start again, with a cookie */
 272                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 273                         else
 274                                 s->state = SSL3_ST_CR_CERT_A;
 275                         s->init_num = 0;
 276                         break;
 277
 278                 case SSL3_ST_CR_CERT_A:
 279                 case SSL3_ST_CR_CERT_B:
 280                         /* Check if it is anon DH */
 281                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 282                                 {
 283                                 ret=ssl3_get_server_certificate(s);
 284                                 if (ret <= 0) goto end;
 285                                 }
 286                         else
 287                                 skip=1;
 288                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 289                         s->init_num=0;
 290                         break;
 291
 292                 case SSL3_ST_CR_KEY_EXCH_A:
 293                 case SSL3_ST_CR_KEY_EXCH_B:
 294                         ret=ssl3_get_key_exchange(s);
 295                         if (ret <= 0) goto end;
 296                         s->state=SSL3_ST_CR_CERT_REQ_A;
 297                         s->init_num=0;
 298
 299                         /* at this point we check that we have the
 300                          * required stuff from the server */
 301                         if (!ssl3_check_cert_and_algorithm(s))
 302                                 {
 303                                 ret= -1;
 304                                 goto end;
 305                                 }
 306                         break;
 307
 308                 case SSL3_ST_CR_CERT_REQ_A:
 309                 case SSL3_ST_CR_CERT_REQ_B:
 310                         ret=ssl3_get_certificate_request(s);
 311                         if (ret <= 0) goto end;
 312                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 313                         s->init_num=0;
 314                         break;
 315
 316                 case SSL3_ST_CR_SRVR_DONE_A:
 317                 case SSL3_ST_CR_SRVR_DONE_B:
 318                         ret=ssl3_get_server_done(s);
 319                         if (ret <= 0) goto end;
 320                         if (s->s3->tmp.cert_req)
 321                                 s->state=SSL3_ST_CW_CERT_A;
 322                         else
 323                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 324                         s->init_num=0;
 325
 326                         break;
 327
 328                 case SSL3_ST_CW_CERT_A:
 329                 case SSL3_ST_CW_CERT_B:
 330                 case SSL3_ST_CW_CERT_C:
 331                 case SSL3_ST_CW_CERT_D:
 332                         ret=dtls1_send_client_certificate(s);
 333                         if (ret <= 0) goto end;
 334                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 335                         s->init_num=0;
 336                         break;
 337
 338                 case SSL3_ST_CW_KEY_EXCH_A:
 339                 case SSL3_ST_CW_KEY_EXCH_B:
 340                         ret=dtls1_send_client_key_exchange(s);
 341                         if (ret <= 0) goto end;
 342                         l=s->s3->tmp.new_cipher->algorithms;
 343                         /* EAY EAY EAY need to check for DH fix cert
 344                          * sent back */
 345                         /* For TLS, cert_req is set to 2, so a cert chain
 346                          * of nothing is sent, but no verify packet is sent */
 347                         if (s->s3->tmp.cert_req == 1)
 348                                 {
 349                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 350                                 }
 351                         else
 352                                 {
 353                                 s->state=SSL3_ST_CW_CHANGE_A;
 354                                 s->s3->change_cipher_spec=0;
 355                                 }
 356
 357                         s->init_num=0;
 358                         break;
 359
 360                 case SSL3_ST_CW_CERT_VRFY_A:
 361                 case SSL3_ST_CW_CERT_VRFY_B:
 362                         ret=dtls1_send_client_verify(s);
 363                         if (ret <= 0) goto end;
 364                         s->state=SSL3_ST_CW_CHANGE_A;
 365                         s->init_num=0;
 366                         s->s3->change_cipher_spec=0;
 367                         break;
 368
 369                 case SSL3_ST_CW_CHANGE_A:
 370                 case SSL3_ST_CW_CHANGE_B:
 371                         ret=dtls1_send_change_cipher_spec(s,
 372                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 373                         if (ret <= 0) goto end;
 374                         s->state=SSL3_ST_CW_FINISHED_A;
 375                         s->init_num=0;
 376
 377                         s->session->cipher=s->s3->tmp.new_cipher;
 378 #ifdef OPENSSL_NO_COMP
 379                         s->session->compress_meth=0;
 380 #else
 381                         if (s->s3->tmp.new_compression == NULL)
 382                                 s->session->compress_meth=0;
 383                         else
 384                                 s->session->compress_meth=
 385                                         s->s3->tmp.new_compression->id;
 386 #endif
 387                         if (!s->method->ssl3_enc->setup_key_block(s))
 388                                 {
 389                                 ret= -1;
 390                                 goto end;
 391                                 }
 392
 393                         if (!s->method->ssl3_enc->change_cipher_state(s,
 394                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 395                                 {
 396                                 ret= -1;
 397                                 goto end;
 398                                 }
 399
 400                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 401                         break;
 402
 403                 case SSL3_ST_CW_FINISHED_A:
 404                 case SSL3_ST_CW_FINISHED_B:
 405                         ret=dtls1_send_finished(s,
 406                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 407                                 s->method->ssl3_enc->client_finished_label,
 408                                 s->method->ssl3_enc->client_finished_label_len);
 409                         if (ret <= 0) goto end;
 410                         s->state=SSL3_ST_CW_FLUSH;
 411
 412                         /* clear flags */
 413                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 414                         if (s->hit)
 415                                 {
 416                                 s->s3->tmp.next_state=SSL_ST_OK;
 417                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 418                                         {
 419                                         s->state=SSL_ST_OK;
 420                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 421                                         s->s3->delay_buf_pop_ret=0;
 422                                         }
 423                                 }
 424                         else
 425                                 {
 426                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 427                                 }
 428                         s->init_num=0;
 429                         /* mark client_random uninitialized */
 430                         memset (s->s3->client_random,0,sizeof(s->s3->client_random));
 431
 432                         break;
 433
 434                 case SSL3_ST_CR_FINISHED_A:
 435                 case SSL3_ST_CR_FINISHED_B:
 436
 437                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 438                                 SSL3_ST_CR_FINISHED_B);
 439                         if (ret <= 0) goto end;
 440
 441                         if (s->hit)
 442                                 s->state=SSL3_ST_CW_CHANGE_A;
 443                         else
 444                                 s->state=SSL_ST_OK;
 445                         s->init_num=0;
 446                         break;
 447
 448                 case SSL3_ST_CW_FLUSH:
 449                         /* number of bytes to be flushed */
 450                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 451                         if (num1 > 0)
 452                                 {
 453                                 s->rwstate=SSL_WRITING;
 454                                 num1=BIO_flush(s->wbio);
 455                                 if (num1 <= 0) { ret= -1; goto end; }
 456                                 s->rwstate=SSL_NOTHING;
 457                                 }
 458
 459                         s->state=s->s3->tmp.next_state;
 460                         break;
 461
 462                 case SSL_ST_OK:
 463                         /* clean a few things up */
 464                         ssl3_cleanup_key_block(s);
 465
 466 #if 0
 467                         if (s->init_buf != NULL)
 468                                 {
 469                                 BUF_MEM_free(s->init_buf);
 470                                 s->init_buf=NULL;
 471                                 }
 472 #endif
 473
 474                         /* If we are not 'joining' the last two packets,
 475                          * remove the buffering now */
 476                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 477                                 ssl_free_wbio_buffer(s);
 478                         /* else do it later in ssl3_write */
 479
 480                         s->init_num=0;
 481                         s->new_session=0;
 482
 483                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 484                         if (s->hit) s->ctx->stats.sess_hit++;
 485
 486                         ret=1;
 487                         /* s->server=0; */
 488                         s->handshake_func=dtls1_connect;
 489                         s->ctx->stats.sess_connect_good++;
 490
 491                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 492
 493                         /* done with handshaking */
 494                         s->d1->handshake_read_seq  = 0;
 495                         goto end;
 496                         /* break; */
 497
 498                 default:
 499                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 500                         ret= -1;
 501                         goto end;
 502                         /* break; */
 503                         }
 504
 505                 /* did we do anything */
 506                 if (!s->s3->tmp.reuse_message && !skip)
 507                         {
 508                         if (s->debug)
 509                                 {
 510                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 511                                         goto end;
 512                                 }
 513
 514                         if ((cb != NULL) && (s->state != state))
 515                                 {
 516                                 new_state=s->state;
 517                                 s->state=state;
 518                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 519                                 s->state=new_state;
 520                                 }
 521                         }
 522                 skip=0;
 523                 }
 524 end:
 525         s->in_handshake--;
 526         if (buf != NULL)
 527                 BUF_MEM_free(buf);
 528         if (cb != NULL)
 529                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 530         return(ret);
 531         }
 532
 533 int dtls1_client_hello(SSL *s)
 534         {
 535         unsigned char *buf;
 536         unsigned char *p,*d;
 537         unsigned int i,j;
 538         unsigned long Time,l;
 539         SSL_COMP *comp;
 540
 541         buf=(unsigned char *)s->init_buf->data;
 542         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 543                 {
 544                 if ((s->session == NULL) ||
 545                         (s->session->ssl_version != s->version) ||
 546                         (s->session->not_resumable))
 547                         {
 548                         if (!ssl_get_new_session(s,0))
 549                                 goto err;
 550                         }
 551                 /* else use the pre-loaded session */
 552
 553                 p=s->s3->client_random;
 554                 /* if client_random is initialized, reuse it, we are
 555                  * required to use same upon reply to HelloVerify */
 556                 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
 557                 if (i==sizeof(s->s3->client_random))
 558                         {
 559                         Time=(unsigned long)time(NULL); /* Time */
 560                         l2n(Time,p);
 561                         RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4);
 562                         }
 563
 564                 /* Do the message type and length last */
 565                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 566
 567                 *(p++)=s->version>>8;
 568                 *(p++)=s->version&0xff;
 569                 s->client_version=s->version;
 570
 571                 /* Random stuff */
 572                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 573                 p+=SSL3_RANDOM_SIZE;
 574
 575                 /* Session ID */
 576                 if (s->new_session)
 577                         i=0;
 578                 else
 579                         i=s->session->session_id_length;
 580                 *(p++)=i;
 581                 if (i != 0)
 582                         {
 583                         if (i > sizeof s->session->session_id)
 584                                 {
 585                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 586                                 goto err;
 587                                 }
 588                         memcpy(p,s->session->session_id,i);
 589                         p+=i;
 590                         }
 591
 592                 /* cookie stuff */
 593                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 594                         {
 595                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 596                         goto err;
 597                         }
 598                 *(p++) = s->d1->cookie_len;
 599                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 600                 p += s->d1->cookie_len;
 601
 602                 /* Ciphers supported */
 603                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 604                 if (i == 0)
 605                         {
 606                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 607                         goto err;
 608                         }
 609                 s2n(i,p);
 610                 p+=i;
 611
 612                 /* COMPRESSION */
 613                 if (s->ctx->comp_methods == NULL)
 614                         j=0;
 615                 else
 616                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 617                 *(p++)=1+j;
 618                 for (i=0; i<j; i++)
 619                         {
 620                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 621                         *(p++)=comp->id;
 622                         }
 623                 *(p++)=0; /* Add the NULL method */
 624
 625                 l=(p-d);
 626                 d=buf;
 627
 628                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 629
 630                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 631                 /* number of bytes to write */
 632                 s->init_num=p-buf;
 633                 s->init_off=0;
 634
 635                 /* buffer the message to handle re-xmits */
 636                 dtls1_buffer_message(s, 0);
 637                 }
 638
 639         /* SSL3_ST_CW_CLNT_HELLO_B */
 640         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 641 err:
 642         return(-1);
 643         }
 644
 645 static int dtls1_get_hello_verify(SSL *s)
 646         {
 647         int n, al, ok = 0;
 648         unsigned char *data;
 649         unsigned int cookie_len;
 650
 651         n=s->method->ssl_get_message(s,
 652                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 653                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 654                 -1,
 655                 s->max_cert_list,
 656                 &ok);
 657
 658         if (!ok) return((int)n);
 659
 660         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 661                 {
 662                 s->d1->send_cookie = 0;
 663                 s->s3->tmp.reuse_message=1;
 664                 return(1);
 665                 }
 666
 667         data = (unsigned char *)s->init_msg;
 668
 669         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 670                 {
 671                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 672                 s->version=(s->version&0xff00)|data[1];
 673                 al = SSL_AD_PROTOCOL_VERSION;
 674                 goto f_err;
 675                 }
 676         data+=2;
 677
 678         cookie_len = *(data++);
 679         if ( cookie_len > sizeof(s->d1->cookie))
 680                 {
 681                 al=SSL_AD_ILLEGAL_PARAMETER;
 682                 goto f_err;
 683                 }
 684
 685         memcpy(s->d1->cookie, data, cookie_len);
 686         s->d1->cookie_len = cookie_len;
 687
 688         s->d1->send_cookie = 1;
 689         return 1;
 690
 691 f_err:
 692         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 693         return -1;
 694         }
 695
 696 int dtls1_send_client_key_exchange(SSL *s)
 697         {
 698         unsigned char *p,*d;
 699         int n;
 700         unsigned long l;
 701 #ifndef OPENSSL_NO_RSA
 702         unsigned char *q;
 703         EVP_PKEY *pkey=NULL;
 704 #endif
 705 #ifndef OPENSSL_NO_KRB5
 706         KSSL_ERR kssl_err;
 707 #endif /* OPENSSL_NO_KRB5 */
 708
 709         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
 710                 {
 711                 d=(unsigned char *)s->init_buf->data;
 712                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 713
 714                 l=s->s3->tmp.new_cipher->algorithms;
 715
 716                 /* Fool emacs indentation */
 717                 if (0) {}
 718 #ifndef OPENSSL_NO_RSA
 719                 else if (l & SSL_kRSA)
 720                         {
 721                         RSA *rsa;
 722                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 723
 724                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
 725                                 rsa=s->session->sess_cert->peer_rsa_tmp;
 726                         else
 727                                 {
 728                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 729                                 if ((pkey == NULL) ||
 730                                         (pkey->type != EVP_PKEY_RSA) ||
 731                                         (pkey->pkey.rsa == NULL))
 732                                         {
 733                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 734                                         goto err;
 735                                         }
 736                                 rsa=pkey->pkey.rsa;
 737                                 EVP_PKEY_free(pkey);
 738                                 }
 739
 740                         tmp_buf[0]=s->client_version>>8;
 741                         tmp_buf[1]=s->client_version&0xff;
 742                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
 743                                         goto err;
 744
 745                         s->session->master_key_length=sizeof tmp_buf;
 746
 747                         q=p;
 748                         /* Fix buf for TLS and [incidentally] DTLS */
 749                         if (s->version > SSL3_VERSION)
 750                                 p+=2;
 751                         n=RSA_public_encrypt(sizeof tmp_buf,
 752                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
 753 #ifdef PKCS1_CHECK
 754                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
 755                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
 756 #endif
 757                         if (n <= 0)
 758                                 {
 759                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
 760                                 goto err;
 761                                 }
 762
 763                         /* Fix buf for TLS and [incidentally] DTLS */
 764                         if (s->version > SSL3_VERSION)
 765                                 {
 766                                 s2n(n,q);
 767                                 n+=2;
 768                                 }
 769
 770                         s->session->master_key_length=
 771                                 s->method->ssl3_enc->generate_master_secret(s,
 772                                         s->session->master_key,
 773                                         tmp_buf,sizeof tmp_buf);
 774                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
 775                         }
 776 #endif
 777 #ifndef OPENSSL_NO_KRB5
 778                 else if (l & SSL_kKRB5)
 779                         {
 780                         krb5_error_code krb5rc;
 781                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
 782                         /*  krb5_data   krb5_ap_req;  */
 783                         krb5_data       *enc_ticket;
 784                         krb5_data       authenticator, *authp = NULL;
 785                         EVP_CIPHER_CTX  ciph_ctx;
 786                         EVP_CIPHER      *enc = NULL;
 787                         unsigned char   iv[EVP_MAX_IV_LENGTH];
 788                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 789                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
 790                                                 + EVP_MAX_IV_LENGTH];
 791                         int             padl, outl = sizeof(epms);
 792
 793                         EVP_CIPHER_CTX_init(&ciph_ctx);
 794
 795 #ifdef KSSL_DEBUG
 796                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
 797                                 l, SSL_kKRB5);
 798 #endif  /* KSSL_DEBUG */
 799
 800                         authp = NULL;
 801 #ifdef KRB5SENDAUTH
 802                         if (KRB5SENDAUTH)  authp = &authenticator;
 803 #endif  /* KRB5SENDAUTH */
 804
 805                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
 806                                 &kssl_err);
 807                         enc = kssl_map_enc(kssl_ctx->enctype);
 808                         if (enc == NULL)
 809                             goto err;
 810 #ifdef KSSL_DEBUG
 811                         {
 812                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
 813                         if (krb5rc && kssl_err.text)
 814                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
 815                         }
 816 #endif  /* KSSL_DEBUG */
 817
 818                         if (krb5rc)
 819                                 {
 820                                 ssl3_send_alert(s,SSL3_AL_FATAL,
 821                                                 SSL_AD_HANDSHAKE_FAILURE);
 822                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 823                                                 kssl_err.reason);
 824                                 goto err;
 825                                 }
 826
 827                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
 828                         **  in place of RFC 2712 KerberosWrapper, as in:
 829                         **
 830                         **  Send ticket (copy to *p, set n = length)
 831                         **  n = krb5_ap_req.length;
 832                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
 833                         **  if (krb5_ap_req.data)
 834                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
 835                         **
 836                         **  Now using real RFC 2712 KerberosWrapper
 837                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
 838                         **  Note: 2712 "opaque" types are here replaced
 839                         **  with a 2-byte length followed by the value.
 840                         **  Example:
 841                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
 842                         **  Where "xx xx" = length bytes.  Shown here with
 843                         **  optional authenticator omitted.
 844                         */
 845
 846                         /*  KerberosWrapper.Ticket              */
 847                         s2n(enc_ticket->length,p);
 848                         memcpy(p, enc_ticket->data, enc_ticket->length);
 849                         p+= enc_ticket->length;
 850                         n = enc_ticket->length + 2;
 851
 852                         /*  KerberosWrapper.Authenticator       */
 853                         if (authp  &&  authp->length)
 854                                 {
 855                                 s2n(authp->length,p);
 856                                 memcpy(p, authp->data, authp->length);
 857                                 p+= authp->length;
 858                                 n+= authp->length + 2;
 859
 860                                 free(authp->data);
 861                                 authp->data = NULL;
 862                                 authp->length = 0;
 863                                 }
 864                         else
 865                                 {
 866                                 s2n(0,p);/*  null authenticator length  */
 867                                 n+=2;
 868                                 }
 869
 870                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
 871                             goto err;
 872
 873                         /*  20010420 VRS.  Tried it this way; failed.
 874                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
 875                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
 876                         **                              kssl_ctx->length);
 877                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
 878                         */
 879
 880                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
 881                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
 882                                 kssl_ctx->key,iv);
 883                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
 884                                 sizeof tmp_buf);
 885                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
 886                         outl += padl;
 887                         if (outl > sizeof epms)
 888                                 {
 889                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 890                                 goto err;
 891                                 }
 892                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
 893
 894                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
 895                         s2n(outl,p);
 896                         memcpy(p, epms, outl);
 897                         p+=outl;
 898                         n+=outl + 2;
 899
 900                         s->session->master_key_length=
 901                                 s->method->ssl3_enc->generate_master_secret(s,
 902                                         s->session->master_key,
 903                                         tmp_buf, sizeof tmp_buf);
 904
 905                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
 906                         OPENSSL_cleanse(epms, outl);
 907                         }
 908 #endif
 909 #ifndef OPENSSL_NO_DH
 910                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 911                         {
 912                         DH *dh_srvr,*dh_clnt;
 913
 914                         if (s->session->sess_cert->peer_dh_tmp != NULL)
 915                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
 916                         else
 917                                 {
 918                                 /* we get them from the cert */
 919                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 920                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
 921                                 goto err;
 922                                 }
 923
 924                         /* generate a new random key */
 925                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
 926                                 {
 927                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 928                                 goto err;
 929                                 }
 930                         if (!DH_generate_key(dh_clnt))
 931                                 {
 932                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 933                                 goto err;
 934                                 }
 935
 936                         /* use the 'p' output buffer for the DH key, but
 937                          * make sure to clear it out afterwards */
 938
 939                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
 940
 941                         if (n <= 0)
 942                                 {
 943                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 944                                 goto err;
 945                                 }
 946
 947                         /* generate master key from the result */
 948                         s->session->master_key_length=
 949                                 s->method->ssl3_enc->generate_master_secret(s,
 950                                         s->session->master_key,p,n);
 951                         /* clean up */
 952                         memset(p,0,n);
 953
 954                         /* send off the data */
 955                         n=BN_num_bytes(dh_clnt->pub_key);
 956                         s2n(n,p);
 957                         BN_bn2bin(dh_clnt->pub_key,p);
 958                         n+=2;
 959
 960                         DH_free(dh_clnt);
 961
 962                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
 963                         }
 964 #endif
 965                 else
 966                         {
 967                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 968                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 969                         goto err;
 970                         }
 971
 972                 d = dtls1_set_message_header(s, d,
 973                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
 974                 /*
 975                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
 976                  l2n3(n,d);
 977                  l2n(s->d1->handshake_write_seq,d);
 978                  s->d1->handshake_write_seq++;
 979                 */
 980
 981                 s->state=SSL3_ST_CW_KEY_EXCH_B;
 982                 /* number of bytes to write */
 983                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
 984                 s->init_off=0;
 985
 986                 /* buffer the message to handle re-xmits */
 987                 dtls1_buffer_message(s, 0);
 988                 }
 989
 990         /* SSL3_ST_CW_KEY_EXCH_B */
 991         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 992 err:
 993         return(-1);
 994         }
 995
 996 int dtls1_send_client_verify(SSL *s)
 997         {
 998         unsigned char *p,*d;
 999         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1000         EVP_PKEY *pkey;
1001 #ifndef OPENSSL_NO_RSA
1002         unsigned u=0;
1003 #endif
1004         unsigned long n;
1005 #ifndef OPENSSL_NO_DSA
1006         int j;
1007 #endif
1008
1009         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1010                 {
1011                 d=(unsigned char *)s->init_buf->data;
1012                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1013                 pkey=s->cert->key->privatekey;
1014
1015                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1016                         &(data[MD5_DIGEST_LENGTH]));
1017
1018 #ifndef OPENSSL_NO_RSA
1019                 if (pkey->type == EVP_PKEY_RSA)
1020                         {
1021                         s->method->ssl3_enc->cert_verify_mac(s,
1022                                 &(s->s3->finish_dgst1),&(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