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