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 <openssl/crypto.h>
 118 #include "ssl_locl.h"
 119 #ifndef OPENSSL_NO_KRB5
 120 #include "kssl_lcl.h"
 121 #endif
 122 #include <openssl/buffer.h>
 123 #include <openssl/rand.h>
 124 #include <openssl/objects.h>
 125 #include <openssl/evp.h>
 126 #include <openssl/md5.h>
 127 #include <openssl/bn.h>
 128 #ifndef OPENSSL_NO_DH
 129 #include <openssl/dh.h>
 130 #endif
 131
 132 static const SSL_METHOD *dtls1_get_client_method(int ver);
 133 static int dtls1_get_hello_verify(SSL *s);
 134
 135 static const SSL_METHOD *dtls1_get_client_method(int ver)
 136         {
 137         if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
 138                 return(DTLSv1_client_method());
 139         else
 140                 return(NULL);
 141         }
 142
 143 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
 144                         ssl_undefined_function,
 145                         dtls1_connect,
 146                         dtls1_get_client_method)
 147
 148 int dtls1_connect(SSL *s)
 149         {
 150         BUF_MEM *buf=NULL;
 151         unsigned long Time=(unsigned long)time(NULL);
 152         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 153         int ret= -1;
 154         int new_state,state,skip=0;
 155 #ifndef OPENSSL_NO_SCTP
 156         unsigned char sctpauthkey[64];
 157         char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
 158 #endif
 159
 160         RAND_add(&Time,sizeof(Time),0);
 161         ERR_clear_error();
 162         clear_sys_error();
 163
 164         if (s->info_callback != NULL)
 165                 cb=s->info_callback;
 166         else if (s->ctx->info_callback != NULL)
 167                 cb=s->ctx->info_callback;
 168
 169         s->in_handshake++;
 170         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 171
 172 #ifndef OPENSSL_NO_SCTP
 173         /* Notify SCTP BIO socket to enter handshake
 174          * mode and prevent stream identifier other
 175          * than 0. Will be ignored if no SCTP is used.
 176          */
 177         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
 178 #endif
 179
 180 #ifndef OPENSSL_NO_HEARTBEATS
 181         /* If we're awaiting a HeartbeatResponse, pretend we
 182          * already got and don't await it anymore, because
 183          * Heartbeats don't make sense during handshakes anyway.
 184          */
 185         if (s->tlsext_hb_pending)
 186                 {
 187                 dtls1_stop_timer(s);
 188                 s->tlsext_hb_pending = 0;
 189                 s->tlsext_hb_seq++;
 190                 }
 191 #endif
 192
 193         for (;;)
 194                 {
 195                 state=s->state;
 196
 197                 switch(s->state)
 198                         {
 199                 case SSL_ST_RENEGOTIATE:
 200                         s->renegotiate=1;
 201                         s->state=SSL_ST_CONNECT;
 202                         s->ctx->stats.sess_connect_renegotiate++;
 203                         /* break */
 204                 case SSL_ST_BEFORE:
 205                 case SSL_ST_CONNECT:
 206                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 207                 case SSL_ST_OK|SSL_ST_CONNECT:
 208
 209                         s->server=0;
 210                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 211
 212                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
 213                             (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
 214                                 {
 215                                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 216                                 ret = -1;
 217                                 goto end;
 218                                 }
 219
 220                         /* s->version=SSL3_VERSION; */
 221                         s->type=SSL_ST_CONNECT;
 222
 223                         if (s->init_buf == NULL)
 224                                 {
 225                                 if ((buf=BUF_MEM_new()) == NULL)
 226                                         {
 227                                         ret= -1;
 228                                         goto end;
 229                                         }
 230                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 231                                         {
 232                                         ret= -1;
 233                                         goto end;
 234                                         }
 235                                 s->init_buf=buf;
 236                                 buf=NULL;
 237                                 }
 238
 239                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 240
 241                         /* setup buffing BIO */
 242                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 243
 244                         /* don't push the buffering BIO quite yet */
 245
 246                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 247                         s->ctx->stats.sess_connect++;
 248                         s->init_num=0;
 249                         /* mark client_random uninitialized */
 250                         memset(s->s3->client_random,0,sizeof(s->s3->client_random));
 251                         s->d1->send_cookie = 0;
 252                         s->hit = 0;
 253                         break;
 254
 255 #ifndef OPENSSL_NO_SCTP
 256                 case DTLS1_SCTP_ST_CR_READ_SOCK:
 257
 258                         if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
 259                         {
 260                                 s->s3->in_read_app_data=2;
 261                                 s->rwstate=SSL_READING;
 262                                 BIO_clear_retry_flags(SSL_get_rbio(s));
 263                                 BIO_set_retry_read(SSL_get_rbio(s));
 264                                 ret = -1;
 265                                 goto end;
 266                         }
 267
 268                         s->state=s->s3->tmp.next_state;
 269                         break;
 270
 271                 case DTLS1_SCTP_ST_CW_WRITE_SOCK:
 272                         /* read app data until dry event */
 273
 274                         ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
 275                         if (ret < 0) goto end;
 276
 277                         if (ret == 0)
 278                         {
 279                                 s->s3->in_read_app_data=2;
 280                                 s->rwstate=SSL_READING;
 281                                 BIO_clear_retry_flags(SSL_get_rbio(s));
 282                                 BIO_set_retry_read(SSL_get_rbio(s));
 283                                 ret = -1;
 284                                 goto end;
 285                         }
 286
 287                         s->state=s->d1->next_state;
 288                         break;
 289 #endif
 290
 291                 case SSL3_ST_CW_CLNT_HELLO_A:
 292                 case SSL3_ST_CW_CLNT_HELLO_B:
 293
 294                         s->shutdown=0;
 295
 296                         /* every DTLS ClientHello resets Finished MAC */
 297                         ssl3_init_finished_mac(s);
 298
 299                         dtls1_start_timer(s);
 300                         ret=dtls1_client_hello(s);
 301                         if (ret <= 0) goto end;
 302
 303                         if ( s->d1->send_cookie)
 304                                 {
 305                                 s->state=SSL3_ST_CW_FLUSH;
 306                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 307                                 }
 308                         else
 309                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 310
 311                         s->init_num=0;
 312
 313 #ifndef OPENSSL_NO_SCTP
 314                         /* Disable buffering for SCTP */
 315                         if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
 316                                 {
 317 #endif
 318                                 /* turn on buffering for the next lot of output */
 319                                 if (s->bbio != s->wbio)
 320                                         s->wbio=BIO_push(s->bbio,s->wbio);
 321 #ifndef OPENSSL_NO_SCTP
 322                                 }
 323 #endif
 324
 325                         break;
 326
 327                 case SSL3_ST_CR_SRVR_HELLO_A:
 328                 case SSL3_ST_CR_SRVR_HELLO_B:
 329                         ret=ssl3_get_server_hello(s);
 330                         if (ret <= 0) goto end;
 331                         else
 332                                 {
 333                                 dtls1_stop_timer(s);
 334                                 if (s->hit)
 335                                         {
 336 #ifndef OPENSSL_NO_SCTP
 337                                         /* Add new shared key for SCTP-Auth,
 338                                          * will be ignored if no SCTP used.
 339                                          */
 340                                         snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 341                                                  DTLS1_SCTP_AUTH_LABEL);
 342
 343                                         SSL_export_keying_material(s, sctpauthkey,
 344                                                                    sizeof(sctpauthkey), labelbuffer,
 345                                                                    sizeof(labelbuffer), NULL, 0, 0);
 346
 347                                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 348                                                          sizeof(sctpauthkey), sctpauthkey);
 349 #endif
 350
 351                                         s->state=SSL3_ST_CR_FINISHED_A;
 352                                         }
 353                                 else
 354                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 355                                 }
 356                         s->init_num=0;
 357                         break;
 358
 359                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 360                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 361
 362                         ret = dtls1_get_hello_verify(s);
 363                         if ( ret <= 0)
 364                                 goto end;
 365                         dtls1_stop_timer(s);
 366                         if ( s->d1->send_cookie) /* start again, with a cookie */
 367                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 368                         else
 369                                 s->state = SSL3_ST_CR_CERT_A;
 370                         s->init_num = 0;
 371                         break;
 372
 373                 case SSL3_ST_CR_CERT_A:
 374                 case SSL3_ST_CR_CERT_B:
 375 #ifndef OPENSSL_NO_TLSEXT
 376                         ret=ssl3_check_finished(s);
 377                         if (ret <= 0) goto end;
 378                         if (ret == 2)
 379                                 {
 380                                 s->hit = 1;
 381                                 if (s->tlsext_ticket_expected)
 382                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 383                                 else
 384                                         s->state=SSL3_ST_CR_FINISHED_A;
 385                                 s->init_num=0;
 386                                 break;
 387                                 }
 388 #endif
 389                         /* Check if it is anon DH or PSK */
 390                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 391                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 392                                 {
 393                                 ret=ssl3_get_server_certificate(s);
 394                                 if (ret <= 0) goto end;
 395 #ifndef OPENSSL_NO_TLSEXT
 396                                 if (s->tlsext_status_expected)
 397                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 398                                 else
 399                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 400                                 }
 401                         else
 402                                 {
 403                                 skip = 1;
 404                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 405                                 }
 406 #else
 407                                 }
 408                         else
 409                                 skip=1;
 410
 411                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 412 #endif
 413                         s->init_num=0;
 414                         break;
 415
 416                 case SSL3_ST_CR_KEY_EXCH_A:
 417                 case SSL3_ST_CR_KEY_EXCH_B:
 418                         ret=ssl3_get_key_exchange(s);
 419                         if (ret <= 0) goto end;
 420                         s->state=SSL3_ST_CR_CERT_REQ_A;
 421                         s->init_num=0;
 422
 423                         /* at this point we check that we have the
 424                          * required stuff from the server */
 425                         if (!ssl3_check_cert_and_algorithm(s))
 426                                 {
 427                                 ret= -1;
 428                                 goto end;
 429                                 }
 430                         break;
 431
 432                 case SSL3_ST_CR_CERT_REQ_A:
 433                 case SSL3_ST_CR_CERT_REQ_B:
 434                         ret=ssl3_get_certificate_request(s);
 435                         if (ret <= 0) goto end;
 436                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 437                         s->init_num=0;
 438                         break;
 439
 440                 case SSL3_ST_CR_SRVR_DONE_A:
 441                 case SSL3_ST_CR_SRVR_DONE_B:
 442                         ret=ssl3_get_server_done(s);
 443                         if (ret <= 0) goto end;
 444                         if (s->s3->tmp.cert_req)
 445                                 s->s3->tmp.next_state=SSL3_ST_CW_CERT_A;
 446                         else
 447                                 s->s3->tmp.next_state=SSL3_ST_CW_KEY_EXCH_A;
 448                         s->init_num=0;
 449
 450 #ifndef OPENSSL_NO_SCTP
 451                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 452                             state == SSL_ST_RENEGOTIATE)
 453                                 s->state=DTLS1_SCTP_ST_CR_READ_SOCK;
 454                         else
 455 #endif
 456                         s->state=s->s3->tmp.next_state;
 457                         break;
 458
 459                 case SSL3_ST_CW_CERT_A:
 460                 case SSL3_ST_CW_CERT_B:
 461                 case SSL3_ST_CW_CERT_C:
 462                 case SSL3_ST_CW_CERT_D:
 463                         dtls1_start_timer(s);
 464                         ret=dtls1_send_client_certificate(s);
 465                         if (ret <= 0) goto end;
 466                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 467                         s->init_num=0;
 468                         break;
 469
 470                 case SSL3_ST_CW_KEY_EXCH_A:
 471                 case SSL3_ST_CW_KEY_EXCH_B:
 472                         dtls1_start_timer(s);
 473                         ret=dtls1_send_client_key_exchange(s);
 474                         if (ret <= 0) goto end;
 475
 476 #ifndef OPENSSL_NO_SCTP
 477                         /* Add new shared key for SCTP-Auth,
 478                          * will be ignored if no SCTP used.
 479                          */
 480                         snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 481                                  DTLS1_SCTP_AUTH_LABEL);
 482
 483                         SSL_export_keying_material(s, sctpauthkey,
 484                                                    sizeof(sctpauthkey), labelbuffer,
 485                                                    sizeof(labelbuffer), NULL, 0, 0);
 486
 487                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 488                                          sizeof(sctpauthkey), sctpauthkey);
 489 #endif
 490
 491                         /* EAY EAY EAY need to check for DH fix cert
 492                          * sent back */
 493                         /* For TLS, cert_req is set to 2, so a cert chain
 494                          * of nothing is sent, but no verify packet is sent */
 495                         if (s->s3->tmp.cert_req == 1)
 496                                 {
 497                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 498                                 }
 499                         else
 500                                 {
 501 #ifndef OPENSSL_NO_SCTP
 502                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 503                                         {
 504                                         s->d1->next_state=SSL3_ST_CW_CHANGE_A;
 505                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 506                                         }
 507                                 else
 508 #endif
 509                                         s->state=SSL3_ST_CW_CHANGE_A;
 510                                 s->s3->change_cipher_spec=0;
 511                                 }
 512
 513                         s->init_num=0;
 514                         break;
 515
 516                 case SSL3_ST_CW_CERT_VRFY_A:
 517                 case SSL3_ST_CW_CERT_VRFY_B:
 518                         dtls1_start_timer(s);
 519                         ret=dtls1_send_client_verify(s);
 520                         if (ret <= 0) goto end;
 521 #ifndef OPENSSL_NO_SCTP
 522                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 523                         {
 524                                 s->d1->next_state=SSL3_ST_CW_CHANGE_A;
 525                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 526                         }
 527                         else
 528 #endif
 529                                 s->state=SSL3_ST_CW_CHANGE_A;
 530                         s->init_num=0;
 531                         s->s3->change_cipher_spec=0;
 532                         break;
 533
 534                 case SSL3_ST_CW_CHANGE_A:
 535                 case SSL3_ST_CW_CHANGE_B:
 536                         if (!s->hit)
 537                                 dtls1_start_timer(s);
 538                         ret=dtls1_send_change_cipher_spec(s,
 539                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 540                         if (ret <= 0) goto end;
 541
 542 #ifndef OPENSSL_NO_SCTP
 543                         /* Change to new shared key of SCTP-Auth,
 544                          * will be ignored if no SCTP used.
 545                          */
 546                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
 547 #endif
 548
 549                         s->state=SSL3_ST_CW_FINISHED_A;
 550                         s->init_num=0;
 551
 552                         s->session->cipher=s->s3->tmp.new_cipher;
 553 #ifdef OPENSSL_NO_COMP
 554                         s->session->compress_meth=0;
 555 #else
 556                         if (s->s3->tmp.new_compression == NULL)
 557                                 s->session->compress_meth=0;
 558                         else
 559                                 s->session->compress_meth=
 560                                         s->s3->tmp.new_compression->id;
 561 #endif
 562                         if (!s->method->ssl3_enc->setup_key_block(s))
 563                                 {
 564                                 ret= -1;
 565                                 goto end;
 566                                 }
 567
 568                         if (!s->method->ssl3_enc->change_cipher_state(s,
 569                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 570                                 {
 571                                 ret= -1;
 572                                 goto end;
 573                                 }
 574
 575                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 576                         break;
 577
 578                 case SSL3_ST_CW_FINISHED_A:
 579                 case SSL3_ST_CW_FINISHED_B:
 580                         if (!s->hit)
 581                                 dtls1_start_timer(s);
 582                         ret=dtls1_send_finished(s,
 583                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 584                                 s->method->ssl3_enc->client_finished_label,
 585                                 s->method->ssl3_enc->client_finished_label_len);
 586                         if (ret <= 0) goto end;
 587                         s->state=SSL3_ST_CW_FLUSH;
 588
 589                         /* clear flags */
 590                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 591                         if (s->hit)
 592                                 {
 593                                 s->s3->tmp.next_state=SSL_ST_OK;
 594 #ifndef OPENSSL_NO_SCTP
 595                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 596                                         {
 597                                                 s->d1->next_state = s->s3->tmp.next_state;
 598                                                 s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 599                                         }
 600 #endif
 601                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 602                                         {
 603                                         s->state=SSL_ST_OK;
 604 #ifndef OPENSSL_NO_SCTP
 605                                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 606                                                 {
 607                                                         s->d1->next_state = SSL_ST_OK;
 608                                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 609                                                 }
 610 #endif
 611                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 612                                         s->s3->delay_buf_pop_ret=0;
 613                                         }
 614                                 }
 615                         else
 616                                 {
 617 #ifndef OPENSSL_NO_TLSEXT
 618                                 /* Allow NewSessionTicket if ticket expected */
 619                                 if (s->tlsext_ticket_expected)
 620                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 621                                 else
 622 #endif
 623
 624                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 625                                 }
 626                         s->init_num=0;
 627                         break;
 628
 629 #ifndef OPENSSL_NO_TLSEXT
 630                 case SSL3_ST_CR_SESSION_TICKET_A:
 631                 case SSL3_ST_CR_SESSION_TICKET_B:
 632                         ret=ssl3_get_new_session_ticket(s);
 633                         if (ret <= 0) goto end;
 634                         s->state=SSL3_ST_CR_FINISHED_A;
 635                         s->init_num=0;
 636                 break;
 637
 638                 case SSL3_ST_CR_CERT_STATUS_A:
 639                 case SSL3_ST_CR_CERT_STATUS_B:
 640                         ret=ssl3_get_cert_status(s);
 641                         if (ret <= 0) goto end;
 642                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 643                         s->init_num=0;
 644                 break;
 645 #endif
 646
 647                 case SSL3_ST_CR_FINISHED_A:
 648                 case SSL3_ST_CR_FINISHED_B:
 649                         s->d1->change_cipher_spec_ok = 1;
 650                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 651                                 SSL3_ST_CR_FINISHED_B);
 652                         if (ret <= 0) goto end;
 653                         dtls1_stop_timer(s);
 654
 655                         if (s->hit)
 656                                 s->state=SSL3_ST_CW_CHANGE_A;
 657                         else
 658                                 s->state=SSL_ST_OK;
 659
 660 #ifndef OPENSSL_NO_SCTP
 661                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 662                                 state == SSL_ST_RENEGOTIATE)
 663                                 {
 664                                 s->d1->next_state=s->state;
 665                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 666                                 }
 667 #endif
 668
 669                         s->init_num=0;
 670                         break;
 671
 672                 case SSL3_ST_CW_FLUSH:
 673                         s->rwstate=SSL_WRITING;
 674                         if (BIO_flush(s->wbio) <= 0)
 675                                 {
 676                                 /* If the write error was fatal, stop trying */
 677                                 if (!BIO_should_retry(s->wbio))
 678                                         {
 679                                         s->rwstate=SSL_NOTHING;
 680                                         s->state=s->s3->tmp.next_state;
 681                                         }
 682
 683                                 ret= -1;
 684                                 goto end;
 685                                 }
 686                         s->rwstate=SSL_NOTHING;
 687                         s->state=s->s3->tmp.next_state;
 688                         break;
 689
 690                 case SSL_ST_OK:
 691                         /* clean a few things up */
 692                         ssl3_cleanup_key_block(s);
 693
 694 #if 0
 695                         if (s->init_buf != NULL)
 696                                 {
 697                                 BUF_MEM_free(s->init_buf);
 698                                 s->init_buf=NULL;
 699                                 }
 700 #endif
 701
 702                         /* If we are not 'joining' the last two packets,
 703                          * remove the buffering now */
 704                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 705                                 ssl_free_wbio_buffer(s);
 706                         /* else do it later in ssl3_write */
 707
 708                         s->init_num=0;
 709                         s->renegotiate=0;
 710                         s->new_session=0;
 711
 712                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 713                         if (s->hit) s->ctx->stats.sess_hit++;
 714
 715                         ret=1;
 716                         /* s->server=0; */
 717                         s->handshake_func=dtls1_connect;
 718                         s->ctx->stats.sess_connect_good++;
 719
 720                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 721
 722                         /* done with handshaking */
 723                         s->d1->handshake_read_seq  = 0;
 724                         s->d1->next_handshake_write_seq = 0;
 725                         goto end;
 726                         /* break; */
 727
 728                 default:
 729                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 730                         ret= -1;
 731                         goto end;
 732                         /* break; */
 733                         }
 734
 735                 /* did we do anything */
 736                 if (!s->s3->tmp.reuse_message && !skip)
 737                         {
 738                         if (s->debug)
 739                                 {
 740                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 741                                         goto end;
 742                                 }
 743
 744                         if ((cb != NULL) && (s->state != state))
 745                                 {
 746                                 new_state=s->state;
 747                                 s->state=state;
 748                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 749                                 s->state=new_state;
 750                                 }
 751                         }
 752                 skip=0;
 753                 }
 754 end:
 755         s->in_handshake--;
 756
 757 #ifndef OPENSSL_NO_SCTP
 758         /* Notify SCTP BIO socket to leave handshake
 759          * mode and allow stream identifier other
 760          * than 0. Will be ignored if no SCTP is used.
 761          */
 762         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
 763 #endif
 764
 765         if (buf != NULL)
 766                 BUF_MEM_free(buf);
 767         if (cb != NULL)
 768                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 769         return(ret);
 770         }
 771
 772 int dtls1_client_hello(SSL *s)
 773         {
 774         unsigned char *buf;
 775         unsigned char *p,*d;
 776         unsigned int i,j;
 777         unsigned long Time,l;
 778         SSL_COMP *comp;
 779
 780         buf=(unsigned char *)s->init_buf->data;
 781         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 782                 {
 783                 SSL_SESSION *sess = s->session;
 784                 if ((s->session == NULL) ||
 785                         (s->session->ssl_version != s->version) ||
 786 #ifdef OPENSSL_NO_TLSEXT
 787                         !sess->session_id_length ||
 788 #else
 789                         (!sess->session_id_length && !sess->tlsext_tick) ||
 790 #endif
 791                         (s->session->not_resumable))
 792                         {
 793                         if (!ssl_get_new_session(s,0))
 794                                 goto err;
 795                         }
 796                 /* else use the pre-loaded session */
 797
 798                 p=s->s3->client_random;
 799
 800                 /* if client_random is initialized, reuse it, we are
 801                  * required to use same upon reply to HelloVerify */
 802                 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
 803                 if (i==sizeof(s->s3->client_random))
 804                         {
 805                         Time=(unsigned long)time(NULL); /* Time */
 806                         l2n(Time,p);
 807                         RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4);
 808                         }
 809
 810                 /* Do the message type and length last */
 811                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 812
 813                 *(p++)=s->version>>8;
 814                 *(p++)=s->version&0xff;
 815                 s->client_version=s->version;
 816
 817                 /* Random stuff */
 818                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 819                 p+=SSL3_RANDOM_SIZE;
 820
 821                 /* Session ID */
 822                 if (s->new_session)
 823                         i=0;
 824                 else
 825                         i=s->session->session_id_length;
 826                 *(p++)=i;
 827                 if (i != 0)
 828                         {
 829                         if (i > sizeof s->session->session_id)
 830                                 {
 831                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 832                                 goto err;
 833                                 }
 834                         memcpy(p,s->session->session_id,i);
 835                         p+=i;
 836                         }
 837
 838                 /* cookie stuff */
 839                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 840                         {
 841                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 842                         goto err;
 843                         }
 844                 *(p++) = s->d1->cookie_len;
 845                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 846                 p += s->d1->cookie_len;
 847
 848                 /* Ciphers supported */
 849                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 850                 if (i == 0)
 851                         {
 852                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 853                         goto err;
 854                         }
 855                 s2n(i,p);
 856                 p+=i;
 857
 858                 /* COMPRESSION */
 859                 if (s->ctx->comp_methods == NULL)
 860                         j=0;
 861                 else
 862                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 863                 *(p++)=1+j;
 864                 for (i=0; i<j; i++)
 865                         {
 866                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 867                         *(p++)=comp->id;
 868                         }
 869                 *(p++)=0; /* Add the NULL method */
 870
 871 #ifndef OPENSSL_NO_TLSEXT
 872                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 873                         {
 874                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 875                         goto err;
 876                         }
 877 #endif
 878
 879                 l=(p-d);
 880                 d=buf;
 881
 882                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 883
 884                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 885                 /* number of bytes to write */
 886                 s->init_num=p-buf;
 887                 s->init_off=0;
 888
 889                 /* buffer the message to handle re-xmits */
 890                 dtls1_buffer_message(s, 0);
 891                 }
 892
 893         /* SSL3_ST_CW_CLNT_HELLO_B */
 894         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 895 err:
 896         return(-1);
 897         }
 898
 899 static int dtls1_get_hello_verify(SSL *s)
 900         {
 901         int n, al, ok = 0;
 902         unsigned char *data;
 903         unsigned int cookie_len;
 904
 905         n=s->method->ssl_get_message(s,
 906                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 907                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 908                 -1,
 909                 s->max_cert_list,
 910                 &ok);
 911
 912         if (!ok) return((int)n);
 913
 914         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 915                 {
 916                 s->d1->send_cookie = 0;
 917                 s->s3->tmp.reuse_message=1;
 918                 return(1);
 919                 }
 920
 921         data = (unsigned char *)s->init_msg;
 922
 923         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 924                 {
 925                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 926                 s->version=(s->version&0xff00)|data[1];
 927                 al = SSL_AD_PROTOCOL_VERSION;
 928                 goto f_err;
 929                 }
 930         data+=2;
 931
 932         cookie_len = *(data++);
 933         if ( cookie_len > sizeof(s->d1->cookie))
 934                 {
 935                 al=SSL_AD_ILLEGAL_PARAMETER;
 936                 goto f_err;
 937                 }
 938
 939         memcpy(s->d1->cookie, data, cookie_len);
 940         s->d1->cookie_len = cookie_len;
 941
 942         s->d1->send_cookie = 1;
 943         return 1;
 944
 945 f_err:
 946         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 947         return -1;
 948         }
 949
 950 int dtls1_send_client_key_exchange(SSL *s)
 951         {
 952         unsigned char *p,*d;
 953         int n;
 954         unsigned long alg_k;
 955 #ifndef OPENSSL_NO_RSA
 956         unsigned char *q;
 957         EVP_PKEY *pkey=NULL;
 958 #endif
 959 #ifndef OPENSSL_NO_KRB5
 960         KSSL_ERR kssl_err;
 961 #endif /* OPENSSL_NO_KRB5 */
 962 #ifndef OPENSSL_NO_ECDH
 963         EC_KEY *clnt_ecdh = NULL;
 964         const EC_POINT *srvr_ecpoint = NULL;
 965         EVP_PKEY *srvr_pub_pkey = NULL;
 966         unsigned char *encodedPoint = NULL;
 967         int encoded_pt_len = 0;
 968         BN_CTX * bn_ctx = NULL;
 969 #endif
 970
 971         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
 972                 {
 973                 d=(unsigned char *)s->init_buf->data;
 974                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 975
 976                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
 977
 978                 /* Fool emacs indentation */
 979                 if (0) {}
 980 #ifndef OPENSSL_NO_RSA
 981                 else if (alg_k & SSL_kRSA)
 982                         {
 983                         RSA *rsa;
 984                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 985
 986                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
 987                                 rsa=s->session->sess_cert->peer_rsa_tmp;
 988                         else
 989                                 {
 990                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 991                                 if ((pkey == NULL) ||
 992                                         (pkey->type != EVP_PKEY_RSA) ||
 993                                         (pkey->pkey.rsa == NULL))
 994                                         {
 995                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 996                                         goto err;
 997                                         }
 998                                 rsa=pkey->pkey.rsa;
 999                                 EVP_PKEY_free(pkey);
1000                                 }
1001
1002                         tmp_buf[0]=s->client_version>>8;
1003                         tmp_buf[1]=s->client_version&0xff;
1004                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1005                                         goto err;
1006
1007                         s->session->master_key_length=sizeof tmp_buf;
1008
1009                         q=p;
1010                         /* Fix buf for TLS and [incidentally] DTLS */
1011                         if (s->version > SSL3_VERSION)
1012                                 p+=2;
1013                         n=RSA_public_encrypt(sizeof tmp_buf,
1014                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1015 #ifdef PKCS1_CHECK
1016                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1017                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1018 #endif
1019                         if (n <= 0)
1020                                 {
1021                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1022                                 goto err;
1023                                 }
1024
1025                         /* Fix buf for TLS and [incidentally] DTLS */
1026                         if (s->version > SSL3_VERSION)
1027                                 {
1028                                 s2n(n,q);
1029                                 n+=2;
1030                                 }
1031
1032                         s->session->master_key_length=
1033                                 s->method->ssl3_enc->generate_master_secret(s,
1034                                         s->session->master_key,
1035                                         tmp_buf,sizeof tmp_buf);
1036                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1037                         }
1038 #endif
1039 #ifndef OPENSSL_NO_KRB5
1040                 else if (alg_k & SSL_kKRB5)
1041                         {
1042                         krb5_error_code krb5rc;
1043                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1044                         /*  krb5_data   krb5_ap_req;  */
1045                         krb5_data       *enc_ticket;
1046                         krb5_data       authenticator, *authp = NULL;
1047                         EVP_CIPHER_CTX  ciph_ctx;
1048                         const EVP_CIPHER *enc = NULL;
1049                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1050                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1051                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
1052                                                 + EVP_MAX_IV_LENGTH];
1053                         int             padl, outl = sizeof(epms);
1054
1055                         EVP_CIPHER_CTX_init(&ciph_ctx);
1056
1057 #ifdef KSSL_DEBUG
1058                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1059                                 alg_k, SSL_kKRB5);
1060 #endif  /* KSSL_DEBUG */
1061
1062                         authp = NULL;
1063 #ifdef KRB5SENDAUTH
1064                         if (KRB5SENDAUTH)  authp = &authenticator;
1065 #endif  /* KRB5SENDAUTH */
1066
1067                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1068                                 &kssl_err);
1069                         enc = kssl_map_enc(kssl_ctx->enctype);
1070                         if (enc == NULL)
1071                             goto err;
1072 #ifdef KSSL_DEBUG
1073                         {
1074                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1075                         if (krb5rc && kssl_err.text)
1076                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1077                         }
1078 #endif  /* KSSL_DEBUG */
1079
1080                         if (krb5rc)
1081                                 {
1082                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1083                                                 SSL_AD_HANDSHAKE_FAILURE);
1084                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1085                                                 kssl_err.reason);
1086                                 goto err;
1087                                 }
1088
1089                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1090                         **  in place of RFC 2712 KerberosWrapper, as in:
1091                         **
1092                         **  Send ticket (copy to *p, set n = length)
1093                         **  n = krb5_ap_req.length;
1094                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1095                         **  if (krb5_ap_req.data)
1096                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1097                         **
1098                         **  Now using real RFC 2712 KerberosWrapper
1099                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1100                         **  Note: 2712 "opaque" types are here replaced
1101                         **  with a 2-byte length followed by the value.
1102                         **  Example:
1103                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1104                         **  Where "xx xx" = length bytes.  Shown here with
1105                         **  optional authenticator omitted.
1106                         */
1107
1108                         /*  KerberosWrapper.Ticket              */
1109                         s2n(enc_ticket->length,p);
1110                         memcpy(p, enc_ticket->data, enc_ticket->length);
1111                         p+= enc_ticket->length;
1112                         n = enc_ticket->length + 2;
1113
1114                         /*  KerberosWrapper.Authenticator       */
1115                         if (authp  &&  authp->length)
1116                                 {
1117                                 s2n(authp->length,p);
1118                                 memcpy(p, authp->data, authp->length);
1119                                 p+= authp->length;
1120                                 n+= authp->length + 2;
1121
1122                                 free(authp->data);
1123                                 authp->data = NULL;
1124                                 authp->length = 0;
1125                                 }
1126                         else
1127                                 {
1128                                 s2n(0,p);/*  null authenticator length  */
1129                                 n+=2;
1130                                 }
1131
1132                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1133                             goto err;
1134
1135                         /*  20010420 VRS.  Tried it this way; failed.
1136                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1137                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1138                         **                              kssl_ctx->length);
1139                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1140                         */
1141
1142                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
1143                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1144                                 kssl_ctx->key,iv);
1145                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1146                                 sizeof tmp_buf);
1147                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1148                         outl += padl;
1149                         if (outl > (int)sizeof epms)
1150                                 {
1151                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1152                                 goto err;
1153                                 }
1154                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1155
1156                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1157                         s2n(outl,p);
1158                         memcpy(p, epms, outl);
1159                         p+=outl;
1160                         n+=outl + 2;
1161
1162                         s->session->master_key_length=
1163                                 s->method->ssl3_enc->generate_master_secret(s,
1164                                         s->session->master_key,
1165                                         tmp_buf, sizeof tmp_buf);
1166
1167                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1168                         OPENSSL_cleanse(epms, outl);
1169                         }
1170 #endif
1171 #ifndef OPENSSL_NO_DH
1172                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1173                         {
1174                         DH *dh_srvr,*dh_clnt;
1175
1176                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1177                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1178                         else
1179                                 {
1180                                 /* we get them from the cert */
1181                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1182                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1183                                 goto err;
1184                                 }
1185
1186                         /* generate a new random key */
1187                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1188                                 {
1189                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1190                                 goto err;
1191                                 }
1192                         if (!DH_generate_key(dh_clnt))
1193                                 {
1194                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1195                                 goto err;
1196                                 }
1197
1198                         /* use the 'p' output buffer for the DH key, but
1199                          * make sure to clear it out afterwards */
1200
1201                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1202
1203                         if (n <= 0)
1204                                 {
1205                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1206                                 goto err;
1207                                 }
1208
1209                         /* generate master key from the result */
1210                         s->session->master_key_length=
1211                                 s->method->ssl3_enc->generate_master_secret(s,
1212                                         s->session->master_key,p,n);
1213                         /* clean up */
1214                         memset(p,0,n);
1215
1216                         /* send off the data */
1217                         n=BN_num_bytes(dh_clnt->pub_key);
1218                         s2n(n,p);
1219                         BN_bn2bin(dh_clnt->pub_key,p);
1220                         n+=2;
1221
1222                         DH_free(dh_clnt);
1223
1224                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1225                         }
1226 #endif
1227 #ifndef OPENSSL_NO_ECDH
1228                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
1229                         {
1230                         const EC_GROUP *srvr_group = NULL;
1231                         EC_KEY *tkey;
1232                         int ecdh_clnt_cert = 0;
1233                         int field_size = 0;
1234
1235                         /* Did we send out the client's
1236                          * ECDH share for use in premaster
1237                          * computation as part of client certificate?
1238                          * If so, set ecdh_clnt_cert to 1.
1239                          */
1240                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
1241                                 {
1242                                 /* XXX: For now, we do not support client
1243                                  * authentication using ECDH certificates.
1244                                  * To add such support, one needs to add
1245                                  * code that checks for appropriate
1246                                  * conditions and sets ecdh_clnt_cert to 1.
1247                                  * For example, the cert have an ECC
1248                                  * key on the same curve as the server's
1249                                  * and the key should be authorized for
1250                                  * key agreement.
1251                                  *
1252                                  * One also needs to add code in ssl3_connect
1253                                  * to skip sending the certificate verify
1254                                  * message.
1255                                  *
1256                                  * if ((s->cert->key->privatekey != NULL) &&
1257                                  *     (s->cert->key->privatekey->type ==
1258                                  *      EVP_PKEY_EC) && ...)
1259                                  * ecdh_clnt_cert = 1;
1260                                  */
1261                                 }
1262
1263                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1264                                 {
1265                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
1266                                 }
1267                         else
1268                                 {
1269                                 /* Get the Server Public Key from Cert */
1270                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1271                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1272                                 if ((srvr_pub_pkey == NULL) ||
1273                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1274                                     (srvr_pub_pkey->pkey.ec == NULL))
1275                                         {
1276                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1277                                             ERR_R_INTERNAL_ERROR);
1278                                         goto err;
1279                                         }
1280
1281                                 tkey = srvr_pub_pkey->pkey.ec;
1282                                 }
1283
1284                         srvr_group   = EC_KEY_get0_group(tkey);
1285                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1286
1287                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1288                                 {
1289                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1290                                     ERR_R_INTERNAL_ERROR);
1291                                 goto err;
1292                                 }
1293
1294                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
1295                                 {
1296                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1297                                 goto err;
1298                                 }
1299
1300                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
1301                                 {
1302                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1303                                 goto err;
1304                                 }
1305                         if (ecdh_clnt_cert)
1306                                 {
1307                                 /* Reuse key info from our certificate
1308                                  * We only need our private key to perform
1309                                  * the ECDH computation.
1310                                  */
1311                                 const BIGNUM *priv_key;
1312                                 tkey = s->cert->key->privatekey->pkey.ec;
1313                                 priv_key = EC_KEY_get0_private_key(tkey);
1314                                 if (priv_key == NULL)
1315                                         {
1316                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1317                                         goto err;
1318                                         }
1319                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
1320                                         {
1321                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1322                                         goto err;
1323                                         }
1324                                 }
1325                         else
1326                                 {
1327                                 /* Generate a new ECDH key pair */
1328                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
1329                                         {
1330                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1331                                         goto err;
1332                                         }
1333                                 }
1334
1335                         /* use the 'p' output buffer for the ECDH key, but
1336                          * make sure to clear it out afterwards
1337                          */
1338
1339                         field_size = EC_GROUP_get_degree(srvr_group);
1340                         if (field_size <= 0)
1341                                 {
1342                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1343                                        ERR_R_ECDH_LIB);
1344                                 goto err;
1345                                 }
1346                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1347                         if (n <= 0)
1348                                 {
1349                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1350                                        ERR_R_ECDH_LIB);
1351                                 goto err;
1352                                 }
1353
1354                         /* generate master key from the result */
1355                         s->session->master_key_length = s->method->ssl3_enc \
1356                             -> generate_master_secret(s,
1357                                 s->session->master_key,
1358                                 p, n);
1359
1360                         memset(p, 0, n); /* clean up */
1361
1362                         if (ecdh_clnt_cert)
1363                                 {
1364                                 /* Send empty client key exch message */
1365                                 n = 0;
1366                                 }
1367                         else
1368                                 {
1369                                 /* First check the size of encoding and
1370                                  * allocate memory accordingly.
1371                                  */
1372                                 encoded_pt_len =
1373                                     EC_POINT_point2oct(srvr_group,
1374                                         EC_KEY_get0_public_key(clnt_ecdh),
1375                                         POINT_CONVERSION_UNCOMPRESSED,
1376                                         NULL, 0, NULL);
1377
1378                                 encodedPoint = (unsigned char *)
1379                                     OPENSSL_malloc(encoded_pt_len *
1380                                         sizeof(unsigned char));
1381                                 bn_ctx = BN_CTX_new();
1382                                 if ((encodedPoint == NULL) ||
1383                                     (bn_ctx == NULL))
1384                                         {
1385                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1386                                         goto err;
1387                                         }
1388
1389                                 /* Encode the public key */
1390                                 n = EC_POINT_point2oct(srvr_group,
1391                                     EC_KEY_get0_public_key(clnt_ecdh),
1392                                     POINT_CONVERSION_UNCOMPRESSED,
1393                                     encodedPoint, encoded_pt_len, bn_ctx);
1394
1395                                 *p = n; /* length of encoded point */
1396                                 /* Encoded point will be copied here */
1397                                 p += 1;
1398                                 /* copy the point */
1399                                 memcpy((unsigned char *)p, encodedPoint, n);
1400                                 /* increment n to account for length field */
1401                                 n += 1;
1402                                 }
1403
1404                         /* Free allocated memory */
1405                         BN_CTX_free(bn_ctx);
1406                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1407                         if (clnt_ecdh != NULL)
1408                                  EC_KEY_free(clnt_ecdh);
1409                         EVP_PKEY_free(srvr_pub_pkey);
1410                         }
1411 #endif /* !OPENSSL_NO_ECDH */
1412
1413 #ifndef OPENSSL_NO_PSK
1414                 else if (alg_k & SSL_kPSK)
1415                         {
1416                         char identity[PSK_MAX_IDENTITY_LEN];
1417                         unsigned char *t = NULL;
1418                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
1419                         unsigned int pre_ms_len = 0, psk_len = 0;
1420                         int psk_err = 1;
1421
1422                         n = 0;
1423                         if (s->psk_client_callback == NULL)
1424                                 {
1425                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1426                                         SSL_R_PSK_NO_CLIENT_CB);
1427                                 goto err;
1428                                 }
1429
1430                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
1431                                 identity, PSK_MAX_IDENTITY_LEN,
1432                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
1433                         if (psk_len > PSK_MAX_PSK_LEN)
1434                                 {
1435                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1436                                         ERR_R_INTERNAL_ERROR);
1437                                 goto psk_err;
1438                                 }
1439                         else if (psk_len == 0)
1440                                 {
1441                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1442                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
1443                                 goto psk_err;
1444                                 }
1445
1446                         /* create PSK pre_master_secret */
1447                         pre_ms_len = 2+psk_len+2+psk_len;
1448                         t = psk_or_pre_ms;
1449                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
1450                         s2n(psk_len, t);
1451                         memset(t, 0, psk_len);
1452                         t+=psk_len;
1453                         s2n(psk_len, t);
1454
1455                         if (s->session->psk_identity_hint != NULL)
1456                                 OPENSSL_free(s->session->psk_identity_hint);
1457                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
1458                         if (s->ctx->psk_identity_hint != NULL &&
1459                                 s->session->psk_identity_hint == NULL)
1460                                 {
1461                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1462                                         ERR_R_MALLOC_FAILURE);
1463                                 goto psk_err;
1464                                 }
1465
1466                         if (s->session->psk_identity != NULL)
1467                                 OPENSSL_free(s->session->psk_identity);
1468                         s->session->psk_identity = BUF_strdup(identity);
1469                         if (s->session->psk_identity == NULL)
1470                                 {
1471                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1472                                         ERR_R_MALLOC_FAILURE);
1473                                 goto psk_err;
1474                                 }
1475
1476                         s->session->master_key_length =
1477                                 s->method->ssl3_enc->generate_master_secret(s,
1478                                         s->session->master_key,
1479                                         psk_or_pre_ms, pre_ms_len);
1480                         n = strlen(identity);
1481                         s2n(n, p);
1482                         memcpy(p, identity, n);
1483                         n+=2;
1484                         psk_err = 0;
1485                 psk_err:
1486                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
1487                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
1488                         if (psk_err != 0)
1489                                 {
1490                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1491                                 goto err;
1492                                 }
1493                         }
1494 #endif
1495                 else
1496                         {
1497                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1498                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1499                         goto err;
1500                         }
1501
1502                 d = dtls1_set_message_header(s, d,
1503                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1504                 /*
1505                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1506                  l2n3(n,d);
1507                  l2n(s->d1->handshake_write_seq,d);
1508                  s->d1->handshake_write_seq++;
1509                 */
1510
1511                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1512                 /* number of bytes to write */
1513                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1514                 s->init_off=0;
1515
1516                 /* buffer the message to handle re-xmits */
1517                 dtls1_buffer_message(s, 0);
1518                 }
1519
1520         /* SSL3_ST_CW_KEY_EXCH_B */
1521         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1522 err:
1523 #ifndef OPENSSL_NO_ECDH
1524         BN_CTX_free(bn_ctx);
1525         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1526         if (clnt_ecdh != NULL)
1527                 EC_KEY_free(clnt_ecdh);
1528         EVP_PKEY_free(srvr_pub_pkey);
1529 #endif
1530         return(-1);
1531         }
1532
1533 int dtls1_send_client_verify(SSL *s)
1534         {
1535         unsigned char *p,*d;
1536         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1537         EVP_PKEY *pkey;
1538 #ifndef OPENSSL_NO_RSA
1539         unsigned u=0;
1540 #endif
1541         unsigned long n;
1542 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
1543         int j;
1544 #endif
1545
1546         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1547                 {
1548                 d=(unsigned char *)s->init_buf->data;
1549                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1550                 pkey=s->cert->key->privatekey;
1551
1552                 s->method->ssl3_enc->cert_verify_mac(s,
1553                 NID_sha1,
1554                         &(data[MD5_DIGEST_LENGTH]));
1555
1556 #ifndef OPENSSL_NO_RSA
1557                 if (pkey->type == EVP_PKEY_RSA)
1558                         {
1559                         s->method->ssl3_enc->cert_verify_mac(s,
1560                                 NID_md5,
1561                                 &(data[0]));
1562                         if (RSA_sign(NID_md5_sha1, data,
1563                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1564                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1565                                 {
1566                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1567                                 goto err;
1568                                 }
1569                         s2n(u,p);
1570                         n=u+2;
1571                         }
1572                 else
1573 #endif
1574 #ifndef OPENSSL_NO_DSA
1575                         if (pkey->type == EVP_PKEY_DSA)
1576                         {
1577                         if (!DSA_sign(pkey->save_type,
1578                                 &(data[MD5_DIGEST_LENGTH]),
1579                                 SHA_DIGEST_LENGTH,&(p[2]),
1580                                 (unsigned int *)&j,pkey->pkey.dsa))
1581                                 {
1582                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1583                                 goto err;
1584                                 }
1585                         s2n(j,p);
1586                         n=j+2;
1587                         }
1588                 else
1589 #endif
1590 #ifndef OPENSSL_NO_ECDSA
1591                         if (pkey->type == EVP_PKEY_EC)
1592                         {
1593                         if (!ECDSA_sign(pkey->save_type,
1594                                 &(data[MD5_DIGEST_LENGTH]),
1595                                 SHA_DIGEST_LENGTH,&(p[2]),
1596                                 (unsigned int *)&j,pkey->pkey.ec))
1597                                 {
1598                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,
1599                                     ERR_R_ECDSA_LIB);
1600                                 goto err;
1601                                 }
1602                         s2n(j,p);
1603                         n=j+2;
1604                         }
1605                 else
1606 #endif
1607                         {
1608                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1609                         goto err;
1610                         }
1611
1612                 d = dtls1_set_message_header(s, d,
1613                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1614
1615                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1616                 s->init_off=0;
1617
1618                 /* buffer the message to handle re-xmits */
1619                 dtls1_buffer_message(s, 0);
1620
1621                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1622                 }
1623
1624         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1625         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1626 err:
1627         return(-1);
1628         }
1629
1630 int dtls1_send_client_certificate(SSL *s)
1631         {
1632         X509 *x509=NULL;
1633         EVP_PKEY *pkey=NULL;
1634         int i;
1635         unsigned long l;
1636
1637         if (s->state == SSL3_ST_CW_CERT_A)
1638                 {
1639                 if ((s->cert == NULL) ||
1640                         (s->cert->key->x509 == NULL) ||
1641                         (s->cert->key->privatekey == NULL))
1642                         s->state=SSL3_ST_CW_CERT_B;
1643                 else
1644                         s->state=SSL3_ST_CW_CERT_C;
1645                 }
1646
1647         /* We need to get a client cert */
1648         if (s->state == SSL3_ST_CW_CERT_B)
1649                 {
1650                 /* If we get an error, we need to
1651                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1652                  * We then get retied later */
1653                 i=0;
1654                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1655                 if (i < 0)
1656                         {
1657                         s->rwstate=SSL_X509_LOOKUP;
1658                         return(-1);
1659                         }
1660                 s->rwstate=SSL_NOTHING;
1661                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1662                         {
1663                         s->state=SSL3_ST_CW_CERT_B;
1664                         if (    !SSL_use_certificate(s,x509) ||
1665                                 !SSL_use_PrivateKey(s,pkey))
1666                                 i=0;
1667                         }
1668                 else if (i == 1)
1669                         {
1670                         i=0;
1671                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1672                         }
1673
1674                 if (x509 != NULL) X509_free(x509);
1675                 if (pkey != NULL) EVP_PKEY_free(pkey);
1676                 if (i == 0)
1677                         {
1678                         if (s->version == SSL3_VERSION)
1679                                 {
1680                                 s->s3->tmp.cert_req=0;
1681                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1682                                 return(1);
1683                                 }
1684                         else
1685                                 {
1686                                 s->s3->tmp.cert_req=2;
1687                                 }
1688                         }
1689
1690                 /* Ok, we have a cert */
1691                 s->state=SSL3_ST_CW_CERT_C;
1692                 }
1693
1694         if (s->state == SSL3_ST_CW_CERT_C)
1695                 {
1696                 s->state=SSL3_ST_CW_CERT_D;
1697                 l=dtls1_output_cert_chain(s,
1698                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1699                 s->init_num=(int)l;
1700                 s->init_off=0;
1701
1702                 /* set header called by dtls1_output_cert_chain() */
1703
1704                 /* buffer the message to handle re-xmits */
1705                 dtls1_buffer_message(s, 0);
1706                 }
1707         /* SSL3_ST_CW_CERT_D */
1708         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1709         }
1710
1711