ssl/d1_clnt.c

   1 /* ssl/d1_clnt.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2007 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #ifndef OPENSSL_NO_KRB5
 119 #include "kssl_lcl.h"
 120 #endif
 121 #include <openssl/buffer.h>
 122 #include <openssl/rand.h>
 123 #include <openssl/objects.h>
 124 #include <openssl/evp.h>
 125 #include <openssl/md5.h>
 126 #include <openssl/bn.h>
 127 #ifndef OPENSSL_NO_DH
 128 #include <openssl/dh.h>
 129 #endif
 130
 131 static const SSL_METHOD *dtls1_get_client_method(int ver);
 132 static int dtls1_get_hello_verify(SSL *s);
 133
 134 static const SSL_METHOD *dtls1_get_client_method(int ver)
 135         {
 136         if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
 137                 return(DTLSv1_client_method());
 138         else
 139                 return(NULL);
 140         }
 141
 142 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
 143                         ssl_undefined_function,
 144                         dtls1_connect,
 145                         dtls1_get_client_method)
 146
 147 int dtls1_connect(SSL *s)
 148         {
 149         BUF_MEM *buf=NULL;
 150         unsigned long Time=(unsigned long)time(NULL);
 151         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 152         int ret= -1;
 153         int new_state,state,skip=0;;
 154
 155         RAND_add(&Time,sizeof(Time),0);
 156         ERR_clear_error();
 157         clear_sys_error();
 158
 159         if (s->info_callback != NULL)
 160                 cb=s->info_callback;
 161         else if (s->ctx->info_callback != NULL)
 162                 cb=s->ctx->info_callback;
 163
 164         s->in_handshake++;
 165         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 166
 167         for (;;)
 168                 {
 169                 state=s->state;
 170
 171                 switch(s->state)
 172                         {
 173                 case SSL_ST_RENEGOTIATE:
 174                         s->renegotiate=1;
 175                         s->state=SSL_ST_CONNECT;
 176                         s->ctx->stats.sess_connect_renegotiate++;
 177                         /* break */
 178                 case SSL_ST_BEFORE:
 179                 case SSL_ST_CONNECT:
 180                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 181                 case SSL_ST_OK|SSL_ST_CONNECT:
 182
 183                         s->server=0;
 184                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 185
 186                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
 187                             (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
 188                                 {
 189                                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 190                                 ret = -1;
 191                                 goto end;
 192                                 }
 193
 194                         /* s->version=SSL3_VERSION; */
 195                         s->type=SSL_ST_CONNECT;
 196
 197                         if (s->init_buf == NULL)
 198                                 {
 199                                 if ((buf=BUF_MEM_new()) == NULL)
 200                                         {
 201                                         ret= -1;
 202                                         goto end;
 203                                         }
 204                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 205                                         {
 206                                         ret= -1;
 207                                         goto end;
 208                                         }
 209                                 s->init_buf=buf;
 210                                 buf=NULL;
 211                                 }
 212
 213                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 214
 215                         /* setup buffing BIO */
 216                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 217
 218                         /* don't push the buffering BIO quite yet */
 219
 220                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 221                         s->ctx->stats.sess_connect++;
 222                         s->init_num=0;
 223                         /* mark client_random uninitialized */
 224                         memset(s->s3->client_random,0,sizeof(s->s3->client_random));
 225                         s->d1->send_cookie = 0;
 226                         s->hit = 0;
 227                         break;
 228
 229                 case SSL3_ST_CW_CLNT_HELLO_A:
 230                 case SSL3_ST_CW_CLNT_HELLO_B:
 231
 232                         s->shutdown=0;
 233
 234                         /* every DTLS ClientHello resets Finished MAC */
 235                         ssl3_init_finished_mac(s);
 236
 237                         dtls1_start_timer(s);
 238                         ret=dtls1_client_hello(s);
 239                         if (ret <= 0) goto end;
 240
 241                         if ( s->d1->send_cookie)
 242                                 {
 243                                 s->state=SSL3_ST_CW_FLUSH;
 244                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 245                                 }
 246                         else
 247                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 248
 249                         s->init_num=0;
 250
 251                         /* turn on buffering for the next lot of output */
 252                         if (s->bbio != s->wbio)
 253                                 s->wbio=BIO_push(s->bbio,s->wbio);
 254
 255                         break;
 256
 257                 case SSL3_ST_CR_SRVR_HELLO_A:
 258                 case SSL3_ST_CR_SRVR_HELLO_B:
 259                         ret=ssl3_get_server_hello(s);
 260                         if (ret <= 0) goto end;
 261                         else
 262                                 {
 263                                 dtls1_stop_timer(s);
 264                                 if (s->hit)
 265                                         s->state=SSL3_ST_CR_FINISHED_A;
 266                                 else
 267                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 268                                 }
 269                         s->init_num=0;
 270                         break;
 271
 272                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 273                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 274
 275                         ret = dtls1_get_hello_verify(s);
 276                         if ( ret <= 0)
 277                                 goto end;
 278                         dtls1_stop_timer(s);
 279                         if ( s->d1->send_cookie) /* start again, with a cookie */
 280                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 281                         else
 282                                 s->state = SSL3_ST_CR_CERT_A;
 283                         s->init_num = 0;
 284                         break;
 285
 286                 case SSL3_ST_CR_CERT_A:
 287                 case SSL3_ST_CR_CERT_B:
 288 #ifndef OPENSSL_NO_TLSEXT
 289                         ret=ssl3_check_finished(s);
 290                         if (ret <= 0) goto end;
 291                         if (ret == 2)
 292                                 {
 293                                 s->hit = 1;
 294                                 if (s->tlsext_ticket_expected)
 295                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 296                                 else
 297                                         s->state=SSL3_ST_CR_FINISHED_A;
 298                                 s->init_num=0;
 299                                 break;
 300                                 }
 301 #endif
 302                         /* Check if it is anon DH or PSK */
 303                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 304                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 305                                 {
 306                                 ret=ssl3_get_server_certificate(s);
 307                                 if (ret <= 0) goto end;
 308 #ifndef OPENSSL_NO_TLSEXT
 309                                 if (s->tlsext_status_expected)
 310                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 311                                 else
 312                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 313                                 }
 314                         else
 315                                 {
 316                                 skip = 1;
 317                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 318                                 }
 319 #else
 320                                 }
 321                         else
 322                                 skip=1;
 323
 324                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 325 #endif
 326                         s->init_num=0;
 327                         break;
 328
 329                 case SSL3_ST_CR_KEY_EXCH_A:
 330                 case SSL3_ST_CR_KEY_EXCH_B:
 331                         ret=ssl3_get_key_exchange(s);
 332                         if (ret <= 0) goto end;
 333                         s->state=SSL3_ST_CR_CERT_REQ_A;
 334                         s->init_num=0;
 335
 336                         /* at this point we check that we have the
 337                          * required stuff from the server */
 338                         if (!ssl3_check_cert_and_algorithm(s))
 339                                 {
 340                                 ret= -1;
 341                                 goto end;
 342                                 }
 343                         break;
 344
 345                 case SSL3_ST_CR_CERT_REQ_A:
 346                 case SSL3_ST_CR_CERT_REQ_B:
 347                         ret=ssl3_get_certificate_request(s);
 348                         if (ret <= 0) goto end;
 349                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 350                         s->init_num=0;
 351                         break;
 352
 353                 case SSL3_ST_CR_SRVR_DONE_A:
 354                 case SSL3_ST_CR_SRVR_DONE_B:
 355                         ret=ssl3_get_server_done(s);
 356                         if (ret <= 0) goto end;
 357                         if (s->s3->tmp.cert_req)
 358                                 s->state=SSL3_ST_CW_CERT_A;
 359                         else
 360                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 361                         s->init_num=0;
 362
 363                         break;
 364
 365                 case SSL3_ST_CW_CERT_A:
 366                 case SSL3_ST_CW_CERT_B:
 367                 case SSL3_ST_CW_CERT_C:
 368                 case SSL3_ST_CW_CERT_D:
 369                         dtls1_start_timer(s);
 370                         ret=dtls1_send_client_certificate(s);
 371                         if (ret <= 0) goto end;
 372                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 373                         s->init_num=0;
 374                         break;
 375
 376                 case SSL3_ST_CW_KEY_EXCH_A:
 377                 case SSL3_ST_CW_KEY_EXCH_B:
 378                         dtls1_start_timer(s);
 379                         ret=dtls1_send_client_key_exchange(s);
 380                         if (ret <= 0) goto end;
 381                         /* EAY EAY EAY need to check for DH fix cert
 382                          * sent back */
 383                         /* For TLS, cert_req is set to 2, so a cert chain
 384                          * of nothing is sent, but no verify packet is sent */
 385                         if (s->s3->tmp.cert_req == 1)
 386                                 {
 387                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 388                                 }
 389                         else
 390                                 {
 391                                 s->state=SSL3_ST_CW_CHANGE_A;
 392                                 s->s3->change_cipher_spec=0;
 393                                 }
 394
 395                         s->init_num=0;
 396                         break;
 397
 398                 case SSL3_ST_CW_CERT_VRFY_A:
 399                 case SSL3_ST_CW_CERT_VRFY_B:
 400                         dtls1_start_timer(s);
 401                         ret=dtls1_send_client_verify(s);
 402                         if (ret <= 0) goto end;
 403                         s->state=SSL3_ST_CW_CHANGE_A;
 404                         s->init_num=0;
 405                         s->s3->change_cipher_spec=0;
 406                         break;
 407
 408                 case SSL3_ST_CW_CHANGE_A:
 409                 case SSL3_ST_CW_CHANGE_B:
 410                         if (!s->hit)
 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                         if (!s->hit)
 447                                 dtls1_start_timer(s);
 448                         ret=dtls1_send_finished(s,
 449                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 450                                 s->method->ssl3_enc->client_finished_label,
 451                                 s->method->ssl3_enc->client_finished_label_len);
 452                         if (ret <= 0) goto end;
 453                         s->state=SSL3_ST_CW_FLUSH;
 454
 455                         /* clear flags */
 456                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 457                         if (s->hit)
 458                                 {
 459                                 s->s3->tmp.next_state=SSL_ST_OK;
 460                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 461                                         {
 462                                         s->state=SSL_ST_OK;
 463                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 464                                         s->s3->delay_buf_pop_ret=0;
 465                                         }
 466                                 }
 467                         else
 468                                 {
 469 #ifndef OPENSSL_NO_TLSEXT
 470                                 /* Allow NewSessionTicket if ticket expected */
 471                                 if (s->tlsext_ticket_expected)
 472                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 473                                 else
 474 #endif
 475
 476                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 477                                 }
 478                         s->init_num=0;
 479                         break;
 480
 481 #ifndef OPENSSL_NO_TLSEXT
 482                 case SSL3_ST_CR_SESSION_TICKET_A:
 483                 case SSL3_ST_CR_SESSION_TICKET_B:
 484                         ret=ssl3_get_new_session_ticket(s);
 485                         if (ret <= 0) goto end;
 486                         s->state=SSL3_ST_CR_FINISHED_A;
 487                         s->init_num=0;
 488                 break;
 489
 490                 case SSL3_ST_CR_CERT_STATUS_A:
 491                 case SSL3_ST_CR_CERT_STATUS_B:
 492                         ret=ssl3_get_cert_status(s);
 493                         if (ret <= 0) goto end;
 494                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 495                         s->init_num=0;
 496                 break;
 497 #endif
 498
 499                 case SSL3_ST_CR_FINISHED_A:
 500                 case SSL3_ST_CR_FINISHED_B:
 501                         s->d1->change_cipher_spec_ok = 1;
 502                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 503                                 SSL3_ST_CR_FINISHED_B);
 504                         if (ret <= 0) goto end;
 505                         dtls1_stop_timer(s);
 506
 507                         if (s->hit)
 508                                 s->state=SSL3_ST_CW_CHANGE_A;
 509                         else
 510                                 s->state=SSL_ST_OK;
 511                         s->init_num=0;
 512                         break;
 513
 514                 case SSL3_ST_CW_FLUSH:
 515                         s->rwstate=SSL_WRITING;
 516                         if (BIO_flush(s->wbio) <= 0)
 517                                 {
 518                                 ret= -1;
 519                                 goto end;
 520                                 }
 521                         s->rwstate=SSL_NOTHING;
 522                         s->state=s->s3->tmp.next_state;
 523                         break;
 524
 525                 case SSL_ST_OK:
 526                         /* clean a few things up */
 527                         ssl3_cleanup_key_block(s);
 528
 529 #if 0
 530                         if (s->init_buf != NULL)
 531                                 {
 532                                 BUF_MEM_free(s->init_buf);
 533                                 s->init_buf=NULL;
 534                                 }
 535 #endif
 536
 537                         /* If we are not 'joining' the last two packets,
 538                          * remove the buffering now */
 539                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 540                                 ssl_free_wbio_buffer(s);
 541                         /* else do it later in ssl3_write */
 542
 543                         s->init_num=0;
 544                         s->renegotiate=0;
 545                         s->new_session=0;
 546
 547                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 548                         if (s->hit) s->ctx->stats.sess_hit++;
 549
 550                         ret=1;
 551                         /* s->server=0; */
 552                         s->handshake_func=dtls1_connect;
 553                         s->ctx->stats.sess_connect_good++;
 554
 555                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 556
 557                         /* done with handshaking */
 558                         s->d1->handshake_read_seq  = 0;
 559                         s->d1->next_handshake_write_seq = 0;
 560                         goto end;
 561                         /* break; */
 562
 563                 default:
 564                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 565                         ret= -1;
 566                         goto end;
 567                         /* break; */
 568                         }
 569
 570                 /* did we do anything */
 571                 if (!s->s3->tmp.reuse_message && !skip)
 572                         {
 573                         if (s->debug)
 574                                 {
 575                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 576                                         goto end;
 577                                 }
 578
 579                         if ((cb != NULL) && (s->state != state))
 580                                 {
 581                                 new_state=s->state;
 582                                 s->state=state;
 583                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 584                                 s->state=new_state;
 585                                 }
 586                         }
 587                 skip=0;
 588                 }
 589 end:
 590         s->in_handshake--;
 591         if (buf != NULL)
 592                 BUF_MEM_free(buf);
 593         if (cb != NULL)
 594                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 595         return(ret);
 596         }
 597
 598 int dtls1_client_hello(SSL *s)
 599         {
 600         unsigned char *buf;
 601         unsigned char *p,*d;
 602         unsigned int i,j;
 603         unsigned long Time,l;
 604         SSL_COMP *comp;
 605
 606         buf=(unsigned char *)s->init_buf->data;
 607         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 608                 {
 609                 SSL_SESSION *sess = s->session;
 610                 if ((s->session == NULL) ||
 611                         (s->session->ssl_version != s->version) ||
 612 #ifdef OPENSSL_NO_TLSEXT
 613                         !sess->session_id_length ||
 614 #else
 615                         (!sess->session_id_length && !sess->tlsext_tick) ||
 616 #endif
 617                         (s->session->not_resumable))
 618                         {
 619                         if (!ssl_get_new_session(s,0))
 620                                 goto err;
 621                         }
 622                 /* else use the pre-loaded session */
 623
 624                 p=s->s3->client_random;
 625
 626                 /* if client_random is initialized, reuse it, we are
 627                  * required to use same upon reply to HelloVerify */
 628                 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
 629                 if (i==sizeof(s->s3->client_random))
 630                         {
 631                         Time=(unsigned long)time(NULL); /* Time */
 632                         l2n(Time,p);
 633                         RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4);
 634                         }
 635
 636                 /* Do the message type and length last */
 637                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 638
 639                 *(p++)=s->version>>8;
 640                 *(p++)=s->version&0xff;
 641                 s->client_version=s->version;
 642
 643                 /* Random stuff */
 644                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 645                 p+=SSL3_RANDOM_SIZE;
 646
 647                 /* Session ID */
 648                 if (s->new_session)
 649                         i=0;
 650                 else
 651                         i=s->session->session_id_length;
 652                 *(p++)=i;
 653                 if (i != 0)
 654                         {
 655                         if (i > sizeof s->session->session_id)
 656                                 {
 657                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 658                                 goto err;
 659                                 }
 660                         memcpy(p,s->session->session_id,i);
 661                         p+=i;
 662                         }
 663
 664                 /* cookie stuff */
 665                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 666                         {
 667                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 668                         goto err;
 669                         }
 670                 *(p++) = s->d1->cookie_len;
 671                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 672                 p += s->d1->cookie_len;
 673
 674                 /* Ciphers supported */
 675                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 676                 if (i == 0)
 677                         {
 678                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 679                         goto err;
 680                         }
 681                 s2n(i,p);
 682                 p+=i;
 683
 684                 /* COMPRESSION */
 685                 if (s->ctx->comp_methods == NULL)
 686                         j=0;
 687                 else
 688                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 689                 *(p++)=1+j;
 690                 for (i=0; i<j; i++)
 691                         {
 692                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 693                         *(p++)=comp->id;
 694                         }
 695                 *(p++)=0; /* Add the NULL method */
 696
 697 #ifndef OPENSSL_NO_TLSEXT
 698                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 699                         {
 700                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 701                         goto err;
 702                         }
 703 #endif
 704
 705                 l=(p-d);
 706                 d=buf;
 707
 708                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 709
 710                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 711                 /* number of bytes to write */
 712                 s->init_num=p-buf;
 713                 s->init_off=0;
 714
 715                 /* buffer the message to handle re-xmits */
 716                 dtls1_buffer_message(s, 0);
 717                 }
 718
 719         /* SSL3_ST_CW_CLNT_HELLO_B */
 720         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 721 err:
 722         return(-1);
 723         }
 724
 725 static int dtls1_get_hello_verify(SSL *s)
 726         {
 727         int n, al, ok = 0;
 728         unsigned char *data;
 729         unsigned int cookie_len;
 730
 731         n=s->method->ssl_get_message(s,
 732                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 733                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 734                 -1,
 735                 s->max_cert_list,
 736                 &ok);
 737
 738         if (!ok) return((int)n);
 739
 740         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 741                 {
 742                 s->d1->send_cookie = 0;
 743                 s->s3->tmp.reuse_message=1;
 744                 return(1);
 745                 }
 746
 747         data = (unsigned char *)s->init_msg;
 748
 749         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 750                 {
 751                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 752                 s->version=(s->version&0xff00)|data[1];
 753                 al = SSL_AD_PROTOCOL_VERSION;
 754                 goto f_err;
 755                 }
 756         data+=2;
 757
 758         cookie_len = *(data++);
 759         if ( cookie_len > sizeof(s->d1->cookie))
 760                 {
 761                 al=SSL_AD_ILLEGAL_PARAMETER;
 762                 goto f_err;
 763                 }
 764
 765         memcpy(s->d1->cookie, data, cookie_len);
 766         s->d1->cookie_len = cookie_len;
 767
 768         s->d1->send_cookie = 1;
 769         return 1;
 770
 771 f_err:
 772         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 773         return -1;
 774         }
 775
 776 int dtls1_send_client_key_exchange(SSL *s)
 777         {
 778         unsigned char *p,*d;
 779         int n;
 780         unsigned long alg_k;
 781 #ifndef OPENSSL_NO_RSA
 782         unsigned char *q;
 783         EVP_PKEY *pkey=NULL;
 784 #endif
 785 #ifndef OPENSSL_NO_KRB5
 786         KSSL_ERR kssl_err;
 787 #endif /* OPENSSL_NO_KRB5 */
 788 #ifndef OPENSSL_NO_ECDH
 789         EC_KEY *clnt_ecdh = NULL;
 790         const EC_POINT *srvr_ecpoint = NULL;
 791         EVP_PKEY *srvr_pub_pkey = NULL;
 792         unsigned char *encodedPoint = NULL;
 793         int encoded_pt_len = 0;
 794         BN_CTX * bn_ctx = NULL;
 795 #endif
 796
 797         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
 798                 {
 799                 d=(unsigned char *)s->init_buf->data;
 800                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 801
 802                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
 803
 804                 /* Fool emacs indentation */
 805                 if (0) {}
 806 #ifndef OPENSSL_NO_RSA
 807                 else if (alg_k & SSL_kRSA)
 808                         {
 809                         RSA *rsa;
 810                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 811
 812                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
 813                                 rsa=s->session->sess_cert->peer_rsa_tmp;
 814                         else
 815                                 {
 816                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 817                                 if ((pkey == NULL) ||
 818                                         (pkey->type != EVP_PKEY_RSA) ||
 819                                         (pkey->pkey.rsa == NULL))
 820                                         {
 821                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 822                                         goto err;
 823                                         }
 824                                 rsa=pkey->pkey.rsa;
 825                                 EVP_PKEY_free(pkey);
 826                                 }
 827
 828                         tmp_buf[0]=s->client_version>>8;
 829                         tmp_buf[1]=s->client_version&0xff;
 830                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
 831                                         goto err;
 832
 833                         s->session->master_key_length=sizeof tmp_buf;
 834
 835                         q=p;
 836                         /* Fix buf for TLS and [incidentally] DTLS */
 837                         if (s->version > SSL3_VERSION)
 838                                 p+=2;
 839                         n=RSA_public_encrypt(sizeof tmp_buf,
 840                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
 841 #ifdef PKCS1_CHECK
 842                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
 843                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
 844 #endif
 845                         if (n <= 0)
 846                                 {
 847                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
 848                                 goto err;
 849                                 }
 850
 851                         /* Fix buf for TLS and [incidentally] DTLS */
 852                         if (s->version > SSL3_VERSION)
 853                                 {
 854                                 s2n(n,q);
 855                                 n+=2;
 856                                 }
 857
 858                         s->session->master_key_length=
 859                                 s->method->ssl3_enc->generate_master_secret(s,
 860                                         s->session->master_key,
 861                                         tmp_buf,sizeof tmp_buf);
 862                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
 863                         }
 864 #endif
 865 #ifndef OPENSSL_NO_KRB5
 866                 else if (alg_k & SSL_kKRB5)
 867                         {
 868                         krb5_error_code krb5rc;
 869                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
 870                         /*  krb5_data   krb5_ap_req;  */
 871                         krb5_data       *enc_ticket;
 872                         krb5_data       authenticator, *authp = NULL;
 873                         EVP_CIPHER_CTX  ciph_ctx;
 874                         const EVP_CIPHER *enc = NULL;
 875                         unsigned char   iv[EVP_MAX_IV_LENGTH];
 876                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 877                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
 878                                                 + EVP_MAX_IV_LENGTH];
 879                         int             padl, outl = sizeof(epms);
 880
 881                         EVP_CIPHER_CTX_init(&ciph_ctx);
 882
 883 #ifdef KSSL_DEBUG
 884                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
 885                                 alg_k, SSL_kKRB5);
 886 #endif  /* KSSL_DEBUG */
 887
 888                         authp = NULL;
 889 #ifdef KRB5SENDAUTH
 890                         if (KRB5SENDAUTH)  authp = &authenticator;
 891 #endif  /* KRB5SENDAUTH */
 892
 893                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
 894                                 &kssl_err);
 895                         enc = kssl_map_enc(kssl_ctx->enctype);
 896                         if (enc == NULL)
 897                             goto err;
 898 #ifdef KSSL_DEBUG
 899                         {
 900                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
 901                         if (krb5rc && kssl_err.text)
 902                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
 903                         }
 904 #endif  /* KSSL_DEBUG */
 905
 906                         if (krb5rc)
 907                                 {
 908                                 ssl3_send_alert(s,SSL3_AL_FATAL,
 909                                                 SSL_AD_HANDSHAKE_FAILURE);
 910                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 911                                                 kssl_err.reason);
 912                                 goto err;
 913                                 }
 914
 915                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
 916                         **  in place of RFC 2712 KerberosWrapper, as in:
 917                         **
 918                         **  Send ticket (copy to *p, set n = length)
 919                         **  n = krb5_ap_req.length;
 920                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
 921                         **  if (krb5_ap_req.data)
 922                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
 923                         **
 924                         **  Now using real RFC 2712 KerberosWrapper
 925                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
 926                         **  Note: 2712 "opaque" types are here replaced
 927                         **  with a 2-byte length followed by the value.
 928                         **  Example:
 929                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
 930                         **  Where "xx xx" = length bytes.  Shown here with
 931                         **  optional authenticator omitted.
 932                         */
 933
 934                         /*  KerberosWrapper.Ticket              */
 935                         s2n(enc_ticket->length,p);
 936                         memcpy(p, enc_ticket->data, enc_ticket->length);
 937                         p+= enc_ticket->length;
 938                         n = enc_ticket->length + 2;
 939
 940                         /*  KerberosWrapper.Authenticator       */
 941                         if (authp  &&  authp->length)
 942                                 {
 943                                 s2n(authp->length,p);
 944                                 memcpy(p, authp->data, authp->length);
 945                                 p+= authp->length;
 946                                 n+= authp->length + 2;
 947
 948                                 free(authp->data);
 949                                 authp->data = NULL;
 950                                 authp->length = 0;
 951                                 }
 952                         else
 953                                 {
 954                                 s2n(0,p);/*  null authenticator length  */
 955                                 n+=2;
 956                                 }
 957
 958                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
 959                             goto err;
 960
 961                         /*  20010420 VRS.  Tried it this way; failed.
 962                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
 963                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
 964                         **                              kssl_ctx->length);
 965                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
 966                         */
 967
 968                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
 969                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
 970                                 kssl_ctx->key,iv);
 971                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
 972                                 sizeof tmp_buf);
 973                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
 974                         outl += padl;
 975                         if (outl > (int)sizeof epms)
 976                                 {
 977                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 978                                 goto err;
 979                                 }
 980                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
 981
 982                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
 983                         s2n(outl,p);
 984                         memcpy(p, epms, outl);
 985                         p+=outl;
 986                         n+=outl + 2;
 987
 988                         s->session->master_key_length=
 989                                 s->method->ssl3_enc->generate_master_secret(s,
 990                                         s->session->master_key,
 991                                         tmp_buf, sizeof tmp_buf);
 992
 993                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
 994                         OPENSSL_cleanse(epms, outl);
 995                         }
 996 #endif
 997 #ifndef OPENSSL_NO_DH
 998                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 999                         {
1000                         DH *dh_srvr,*dh_clnt;
1001
1002                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1003                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1004                         else
1005                                 {
1006                                 /* we get them from the cert */
1007                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1008                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1009                                 goto err;
1010                                 }
1011
1012                         /* generate a new random key */
1013                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1014                                 {
1015                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1016                                 goto err;
1017                                 }
1018                         if (!DH_generate_key(dh_clnt))
1019                                 {
1020                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1021                                 goto err;
1022                                 }
1023
1024                         /* use the 'p' output buffer for the DH key, but
1025                          * make sure to clear it out afterwards */
1026
1027                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1028
1029                         if (n <= 0)
1030                                 {
1031                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1032                                 goto err;
1033                                 }
1034
1035                         /* generate master key from the result */
1036                         s->session->master_key_length=
1037                                 s->method->ssl3_enc->generate_master_secret(s,
1038                                         s->session->master_key,p,n);
1039                         /* clean up */
1040                         memset(p,0,n);
1041
1042                         /* send off the data */
1043                         n=BN_num_bytes(dh_clnt->pub_key);
1044                         s2n(n,p);
1045                         BN_bn2bin(dh_clnt->pub_key,p);
1046                         n+=2;
1047
1048                         DH_free(dh_clnt);
1049
1050                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1051                         }
1052 #endif
1053 #ifndef OPENSSL_NO_ECDH
1054                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
1055                         {
1056                         const EC_GROUP *srvr_group = NULL;
1057                         EC_KEY *tkey;
1058                         int ecdh_clnt_cert = 0;
1059                         int field_size = 0;
1060
1061                         /* Did we send out the client's
1062                          * ECDH share for use in premaster
1063                          * computation as part of client certificate?
1064                          * If so, set ecdh_clnt_cert to 1.
1065                          */
1066                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
1067                                 {
1068                                 /* XXX: For now, we do not support client
1069                                  * authentication using ECDH certificates.
1070                                  * To add such support, one needs to add
1071                                  * code that checks for appropriate
1072                                  * conditions and sets ecdh_clnt_cert to 1.
1073                                  * For example, the cert have an ECC
1074                                  * key on the same curve as the server's
1075                                  * and the key should be authorized for
1076                                  * key agreement.
1077                                  *
1078                                  * One also needs to add code in ssl3_connect
1079                                  * to skip sending the certificate verify
1080                                  * message.
1081                                  *
1082                                  * if ((s->cert->key->privatekey != NULL) &&
1083                                  *     (s->cert->key->privatekey->type ==
1084                                  *      EVP_PKEY_EC) && ...)
1085                                  * ecdh_clnt_cert = 1;
1086                                  */
1087                                 }
1088
1089                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1090                                 {
1091                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
1092                                 }
1093                         else
1094                                 {
1095                                 /* Get the Server Public Key from Cert */
1096                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1097                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1098                                 if ((srvr_pub_pkey == NULL) ||
1099                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1100                                     (srvr_pub_pkey->pkey.ec == NULL))
1101                                         {
1102                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1103                                             ERR_R_INTERNAL_ERROR);
1104                                         goto err;
1105                                         }
1106
1107                                 tkey = srvr_pub_pkey->pkey.ec;
1108                                 }
1109
1110                         srvr_group   = EC_KEY_get0_group(tkey);
1111                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1112
1113                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1114                                 {
1115                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1116                                     ERR_R_INTERNAL_ERROR);
1117                                 goto err;
1118                                 }
1119
1120                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
1121                                 {
1122                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1123                                 goto err;
1124                                 }
1125
1126                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
1127                                 {
1128                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1129                                 goto err;
1130                                 }
1131                         if (ecdh_clnt_cert)
1132                                 {
1133                                 /* Reuse key info from our certificate
1134                                  * We only need our private key to perform
1135                                  * the ECDH computation.
1136                                  */
1137                                 const BIGNUM *priv_key;
1138                                 tkey = s->cert->key->privatekey->pkey.ec;
1139                                 priv_key = EC_KEY_get0_private_key(tkey);
1140                                 if (priv_key == NULL)
1141                                         {
1142                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1143                                         goto err;
1144                                         }
1145                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
1146                                         {
1147                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1148                                         goto err;
1149                                         }
1150                                 }
1151                         else
1152                                 {
1153                                 /* Generate a new ECDH key pair */
1154                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
1155                                         {
1156                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1157                                         goto err;
1158                                         }
1159                                 }
1160
1161                         /* use the 'p' output buffer for the ECDH key, but
1162                          * make sure to clear it out afterwards
1163                          */
1164
1165                         field_size = EC_GROUP_get_degree(srvr_group);
1166                         if (field_size <= 0)
1167                                 {
1168                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1169                                        ERR_R_ECDH_LIB);
1170                                 goto err;
1171                                 }
1172                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1173                         if (n <= 0)
1174                                 {
1175                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1176                                        ERR_R_ECDH_LIB);
1177                                 goto err;
1178                                 }
1179
1180                         /* generate master key from the result */
1181                         s->session->master_key_length = s->method->ssl3_enc \
1182                             -> generate_master_secret(s,
1183                                 s->session->master_key,
1184                                 p, n);
1185
1186                         memset(p, 0, n); /* clean up */
1187
1188                         if (ecdh_clnt_cert)
1189                                 {
1190                                 /* Send empty client key exch message */
1191                                 n = 0;
1192                                 }
1193                         else
1194                                 {
1195                                 /* First check the size of encoding and
1196                                  * allocate memory accordingly.
1197                                  */
1198                                 encoded_pt_len =
1199                                     EC_POINT_point2oct(srvr_group,
1200                                         EC_KEY_get0_public_key(clnt_ecdh),
1201                                         POINT_CONVERSION_UNCOMPRESSED,
1202                                         NULL, 0, NULL);
1203
1204                                 encodedPoint = (unsigned char *)
1205                                     OPENSSL_malloc(encoded_pt_len *
1206                                         sizeof(unsigned char));
1207                                 bn_ctx = BN_CTX_new();
1208                                 if ((encodedPoint == NULL) ||
1209                                     (bn_ctx == NULL))
1210                                         {
1211                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1212                                         goto err;
1213                                         }
1214
1215                                 /* Encode the public key */
1216                                 n = EC_POINT_point2oct(srvr_group,
1217                                     EC_KEY_get0_public_key(clnt_ecdh),
1218                                     POINT_CONVERSION_UNCOMPRESSED,
1219                                     encodedPoint, encoded_pt_len, bn_ctx);
1220
1221                                 *p = n; /* length of encoded point */
1222                                 /* Encoded point will be copied here */
1223                                 p += 1;
1224                                 /* copy the point */
1225                                 memcpy((unsigned char *)p, encodedPoint, n);
1226                                 /* increment n to account for length field */
1227                                 n += 1;
1228                                 }
1229
1230                         /* Free allocated memory */
1231                         BN_CTX_free(bn_ctx);
1232                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1233                         if (clnt_ecdh != NULL)
1234                                  EC_KEY_free(clnt_ecdh);
1235                         EVP_PKEY_free(srvr_pub_pkey);
1236                         }
1237 #endif /* !OPENSSL_NO_ECDH */
1238
1239 #ifndef OPENSSL_NO_PSK
1240                 else if (alg_k & SSL_kPSK)
1241                         {
1242                         char identity[PSK_MAX_IDENTITY_LEN];
1243                         unsigned char *t = NULL;
1244                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
1245                         unsigned int pre_ms_len = 0, psk_len = 0;
1246                         int psk_err = 1;
1247
1248                         n = 0;
1249                         if (s->psk_client_callback == NULL)
1250                                 {
1251                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1252                                         SSL_R_PSK_NO_CLIENT_CB);
1253                                 goto err;
1254                                 }
1255
1256                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
1257                                 identity, PSK_MAX_IDENTITY_LEN,
1258                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
1259                         if (psk_len > PSK_MAX_PSK_LEN)
1260                                 {
1261                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1262                                         ERR_R_INTERNAL_ERROR);
1263                                 goto psk_err;
1264                                 }
1265                         else if (psk_len == 0)
1266                                 {
1267                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1268                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
1269                                 goto psk_err;
1270                                 }
1271
1272                         /* create PSK pre_master_secret */
1273                         pre_ms_len = 2+psk_len+2+psk_len;
1274                         t = psk_or_pre_ms;
1275                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
1276                         s2n(psk_len, t);
1277                         memset(t, 0, psk_len);
1278                         t+=psk_len;
1279                         s2n(psk_len, t);
1280
1281                         if (s->session->psk_identity_hint != NULL)
1282                                 OPENSSL_free(s->session->psk_identity_hint);
1283                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
1284                         if (s->ctx->psk_identity_hint != NULL &&
1285                                 s->session->psk_identity_hint == NULL)
1286                                 {
1287                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1288                                         ERR_R_MALLOC_FAILURE);
1289                                 goto psk_err;
1290                                 }
1291
1292                         if (s->session->psk_identity != NULL)
1293                                 OPENSSL_free(s->session->psk_identity);
1294                         s->session->psk_identity = BUF_strdup(identity);
1295                         if (s->session->psk_identity == NULL)
1296                                 {
1297                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1298                                         ERR_R_MALLOC_FAILURE);
1299                                 goto psk_err;
1300                                 }
1301
1302                         s->session->master_key_length =
1303                                 s->method->ssl3_enc->generate_master_secret(s,
1304                                         s->session->master_key,
1305                                         psk_or_pre_ms, pre_ms_len);
1306                         n = strlen(identity);
1307                         s2n(n, p);
1308                         memcpy(p, identity, n);
1309                         n+=2;
1310                         psk_err = 0;
1311                 psk_err:
1312                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
1313                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
1314                         if (psk_err != 0)
1315                                 {
1316                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1317                                 goto err;
1318                                 }
1319                         }
1320 #endif
1321                 else
1322                         {
1323                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1324                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1325                         goto err;
1326                         }
1327
1328                 d = dtls1_set_message_header(s, d,
1329                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1330                 /*
1331                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1332                  l2n3(n,d);
1333                  l2n(s->d1->handshake_write_seq,d);
1334                  s->d1->handshake_write_seq++;
1335                 */
1336
1337                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1338                 /* number of bytes to write */
1339                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1340                 s->init_off=0;
1341
1342                 /* buffer the message to handle re-xmits */
1343                 dtls1_buffer_message(s, 0);
1344                 }
1345
1346         /* SSL3_ST_CW_KEY_EXCH_B */
1347         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1348 err:
1349 #ifndef OPENSSL_NO_ECDH
1350         BN_CTX_free(bn_ctx);
1351         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1352         if (clnt_ecdh != NULL)
1353                 EC_KEY_free(clnt_ecdh);
1354         EVP_PKEY_free(srvr_pub_pkey);
1355 #endif
1356         return(-1);
1357         }
1358
1359 int dtls1_send_client_verify(SSL *s)
1360         {
1361         unsigned char *p,*d;
1362         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1363         EVP_PKEY *pkey;
1364 #ifndef OPENSSL_NO_RSA
1365         unsigned u=0;
1366 #endif
1367         unsigned long n;
1368 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
1369         int j;
1370 #endif
1371
1372         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1373                 {
1374                 d=(unsigned char *)s->init_buf->data;
1375                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1376                 pkey=s->cert->key->privatekey;
1377
1378                 s->method->ssl3_enc->cert_verify_mac(s,
1379                 NID_sha1,
1380                         &(data[MD5_DIGEST_LENGTH]));
1381
1382 #ifndef OPENSSL_NO_RSA
1383                 if (pkey->type == EVP_PKEY_RSA)
1384                         {
1385                         s->method->ssl3_enc->cert_verify_mac(s,
1386                                 NID_md5,
1387                                 &(data[0]));
1388                         if (RSA_sign(NID_md5_sha1, data,
1389                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1390                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1391                                 {
1392                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1393                                 goto err;
1394                                 }
1395                         s2n(u,p);
1396                         n=u+2;
1397                         }
1398                 else
1399 #endif
1400 #ifndef OPENSSL_NO_DSA
1401                         if (pkey->type == EVP_PKEY_DSA)
1402                         {
1403                         if (!DSA_sign(pkey->save_type,
1404                                 &(data[MD5_DIGEST_LENGTH]),
1405                                 SHA_DIGEST_LENGTH,&(p[2]),
1406                                 (unsigned int *)&j,pkey->pkey.dsa))
1407                                 {
1408                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1409                                 goto err;
1410                                 }
1411                         s2n(j,p);
1412                         n=j+2;
1413                         }
1414                 else
1415 #endif
1416 #ifndef OPENSSL_NO_ECDSA
1417                         if (pkey->type == EVP_PKEY_EC)
1418                         {
1419                         if (!ECDSA_sign(pkey->save_type,
1420                                 &(data[MD5_DIGEST_LENGTH]),
1421                                 SHA_DIGEST_LENGTH,&(p[2]),
1422                                 (unsigned int *)&j,pkey->pkey.ec))
1423                                 {
1424                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,
1425                                     ERR_R_ECDSA_LIB);
1426                                 goto err;
1427                                 }
1428                         s2n(j,p);
1429                         n=j+2;
1430                         }
1431                 else
1432 #endif
1433                         {
1434                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1435                         goto err;
1436                         }
1437
1438                 d = dtls1_set_message_header(s, d,
1439                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1440
1441                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1442                 s->init_off=0;
1443
1444                 /* buffer the message to handle re-xmits */
1445                 dtls1_buffer_message(s, 0);
1446
1447                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1448                 }
1449
1450         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1451         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1452 err:
1453         return(-1);
1454         }
1455
1456 int dtls1_send_client_certificate(SSL *s)
1457         {
1458         X509 *x509=NULL;
1459         EVP_PKEY *pkey=NULL;
1460         int i;
1461         unsigned long l;
1462
1463         if (s->state == SSL3_ST_CW_CERT_A)
1464                 {
1465                 if ((s->cert == NULL) ||
1466                         (s->cert->key->x509 == NULL) ||
1467                         (s->cert->key->privatekey == NULL))
1468                         s->state=SSL3_ST_CW_CERT_B;
1469                 else
1470                         s->state=SSL3_ST_CW_CERT_C;
1471                 }
1472
1473         /* We need to get a client cert */
1474         if (s->state == SSL3_ST_CW_CERT_B)
1475                 {
1476                 /* If we get an error, we need to
1477                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1478                  * We then get retied later */
1479                 i=0;
1480                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1481                 if (i < 0)
1482                         {
1483                         s->rwstate=SSL_X509_LOOKUP;
1484                         return(-1);
1485                         }
1486                 s->rwstate=SSL_NOTHING;
1487                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1488                         {
1489                         s->state=SSL3_ST_CW_CERT_B;
1490                         if (    !SSL_use_certificate(s,x509) ||
1491                                 !SSL_use_PrivateKey(s,pkey))
1492                                 i=0;
1493                         }
1494                 else if (i == 1)
1495                         {
1496                         i=0;
1497                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1498                         }
1499
1500                 if (x509 != NULL) X509_free(x509);
1501                 if (pkey != NULL) EVP_PKEY_free(pkey);
1502                 if (i == 0)
1503                         {
1504                         if (s->version == SSL3_VERSION)
1505                                 {
1506                                 s->s3->tmp.cert_req=0;
1507                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1508                                 return(1);
1509                                 }
1510                         else
1511                                 {
1512                                 s->s3->tmp.cert_req=2;
1513                                 }
1514                         }
1515
1516                 /* Ok, we have a cert */
1517                 s->state=SSL3_ST_CW_CERT_C;
1518                 }
1519
1520         if (s->state == SSL3_ST_CW_CERT_C)
1521                 {
1522                 s->state=SSL3_ST_CW_CERT_D;
1523                 l=dtls1_output_cert_chain(s,
1524                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1525                 s->init_num=(int)l;
1526                 s->init_off=0;
1527
1528                 /* set header called by dtls1_output_cert_chain() */
1529
1530                 /* buffer the message to handle re-xmits */
1531                 dtls1_buffer_message(s, 0);
1532                 }
1533         /* SSL3_ST_CW_CERT_D */
1534         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1535         }
1536
1537