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