crypto/openssl/ssl/d1_srvr.c

   1 /* ssl/d1_srvr.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2005 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #include <openssl/buffer.h>
 119 #include <openssl/rand.h>
 120 #include <openssl/objects.h>
 121 #include <openssl/evp.h>
 122 #include <openssl/x509.h>
 123 #include <openssl/md5.h>
 124 #ifndef OPENSSL_NO_DH
 125 # include <openssl/dh.h>
 126 #endif
 127
 128 static SSL_METHOD *dtls1_get_server_method(int ver);
 129 static int dtls1_send_hello_verify_request(SSL *s);
 130
 131 static SSL_METHOD *dtls1_get_server_method(int ver)
 132 {
 133     if (ver == DTLS1_VERSION)
 134         return (DTLSv1_server_method());
 135     else
 136         return (NULL);
 137 }
 138
 139 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
 140                           dtls1_accept,
 141                           ssl_undefined_function, dtls1_get_server_method)
 142
 143 int dtls1_accept(SSL *s)
 144 {
 145     BUF_MEM *buf;
 146     unsigned long l, Time = (unsigned long)time(NULL);
 147     void (*cb) (const SSL *ssl, int type, int val) = NULL;
 148     int ret = -1;
 149     int new_state, state, skip = 0;
 150     int listen;
 151
 152     RAND_add(&Time, sizeof(Time), 0);
 153     ERR_clear_error();
 154     clear_sys_error();
 155
 156     if (s->info_callback != NULL)
 157         cb = s->info_callback;
 158     else if (s->ctx->info_callback != NULL)
 159         cb = s->ctx->info_callback;
 160
 161     listen = s->d1->listen;
 162
 163     /* init things to blank */
 164     s->in_handshake++;
 165     if (!SSL_in_init(s) || SSL_in_before(s))
 166         SSL_clear(s);
 167
 168     s->d1->listen = listen;
 169
 170     if (s->cert == NULL) {
 171         SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_NO_CERTIFICATE_SET);
 172         return (-1);
 173     }
 174
 175     for (;;) {
 176         state = s->state;
 177
 178         switch (s->state) {
 179         case SSL_ST_RENEGOTIATE:
 180             s->new_session = 1;
 181             /* s->state=SSL_ST_ACCEPT; */
 182
 183         case SSL_ST_BEFORE:
 184         case SSL_ST_ACCEPT:
 185         case SSL_ST_BEFORE | SSL_ST_ACCEPT:
 186         case SSL_ST_OK | SSL_ST_ACCEPT:
 187
 188             s->server = 1;
 189             if (cb != NULL)
 190                 cb(s, SSL_CB_HANDSHAKE_START, 1);
 191
 192             if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) {
 193                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
 194                 return -1;
 195             }
 196             s->type = SSL_ST_ACCEPT;
 197
 198             if (s->init_buf == NULL) {
 199                 if ((buf = BUF_MEM_new()) == NULL) {
 200                     ret = -1;
 201                     goto end;
 202                 }
 203                 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
 204                     ret = -1;
 205                     goto end;
 206                 }
 207                 s->init_buf = buf;
 208             }
 209
 210             if (!ssl3_setup_buffers(s)) {
 211                 ret = -1;
 212                 goto end;
 213             }
 214
 215             s->init_num = 0;
 216
 217             if (s->state != SSL_ST_RENEGOTIATE) {
 218                 /*
 219                  * Ok, we now need to push on a buffering BIO so that the
 220                  * output is sent in a way that TCP likes :-)
 221                  */
 222                 if (!ssl_init_wbio_buffer(s, 1)) {
 223                     ret = -1;
 224                     goto end;
 225                 }
 226
 227                 ssl3_init_finished_mac(s);
 228                 s->state = SSL3_ST_SR_CLNT_HELLO_A;
 229                 s->ctx->stats.sess_accept++;
 230             } else {
 231                 /*
 232                  * s->state == SSL_ST_RENEGOTIATE, we will just send a
 233                  * HelloRequest
 234                  */
 235                 s->ctx->stats.sess_accept_renegotiate++;
 236                 s->state = SSL3_ST_SW_HELLO_REQ_A;
 237             }
 238
 239             break;
 240
 241         case SSL3_ST_SW_HELLO_REQ_A:
 242         case SSL3_ST_SW_HELLO_REQ_B:
 243
 244             s->shutdown = 0;
 245             dtls1_clear_record_buffer(s);
 246             dtls1_start_timer(s);
 247             ret = dtls1_send_hello_request(s);
 248             if (ret <= 0)
 249                 goto end;
 250             s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
 251             s->state = SSL3_ST_SW_FLUSH;
 252             s->init_num = 0;
 253
 254             ssl3_init_finished_mac(s);
 255             break;
 256
 257         case SSL3_ST_SW_HELLO_REQ_C:
 258             s->state = SSL_ST_OK;
 259             break;
 260
 261         case SSL3_ST_SR_CLNT_HELLO_A:
 262         case SSL3_ST_SR_CLNT_HELLO_B:
 263         case SSL3_ST_SR_CLNT_HELLO_C:
 264
 265             s->shutdown = 0;
 266             ret = ssl3_get_client_hello(s);
 267             if (ret <= 0)
 268                 goto end;
 269             dtls1_stop_timer(s);
 270
 271             if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
 272                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
 273             else
 274                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
 275
 276             s->init_num = 0;
 277
 278             /*
 279              * Reflect ClientHello sequence to remain stateless while
 280              * listening
 281              */
 282             if (listen) {
 283                 memcpy(s->s3->write_sequence, s->s3->read_sequence,
 284                        sizeof(s->s3->write_sequence));
 285             }
 286
 287             /* If we're just listening, stop here */
 288             if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) {
 289                 ret = 2;
 290                 s->d1->listen = 0;
 291                 /*
 292                  * Set expected sequence numbers to continue the handshake.
 293                  */
 294                 s->d1->handshake_read_seq = 2;
 295                 s->d1->handshake_write_seq = 1;
 296                 s->d1->next_handshake_write_seq = 1;
 297                 goto end;
 298             }
 299
 300             break;
 301
 302         case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
 303         case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
 304
 305             ret = dtls1_send_hello_verify_request(s);
 306             if (ret <= 0)
 307                 goto end;
 308             s->state = SSL3_ST_SW_FLUSH;
 309             s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
 310
 311             /* HelloVerifyRequests resets Finished MAC */
 312             if (s->client_version != DTLS1_BAD_VER)
 313                 ssl3_init_finished_mac(s);
 314             break;
 315
 316         case SSL3_ST_SW_SRVR_HELLO_A:
 317         case SSL3_ST_SW_SRVR_HELLO_B:
 318             s->new_session = 2;
 319             dtls1_start_timer(s);
 320             ret = dtls1_send_server_hello(s);
 321             if (ret <= 0)
 322                 goto end;
 323
 324 #ifndef OPENSSL_NO_TLSEXT
 325             if (s->hit) {
 326                 if (s->tlsext_ticket_expected)
 327                     s->state = SSL3_ST_SW_SESSION_TICKET_A;
 328                 else
 329                     s->state = SSL3_ST_SW_CHANGE_A;
 330             }
 331 #else
 332             if (s->hit)
 333                 s->state = SSL3_ST_SW_CHANGE_A;
 334 #endif
 335             else
 336                 s->state = SSL3_ST_SW_CERT_A;
 337             s->init_num = 0;
 338             break;
 339
 340         case SSL3_ST_SW_CERT_A:
 341         case SSL3_ST_SW_CERT_B:
 342             /* Check if it is anon DH */
 343             if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) {
 344                 dtls1_start_timer(s);
 345                 ret = dtls1_send_server_certificate(s);
 346                 if (ret <= 0)
 347                     goto end;
 348 #ifndef OPENSSL_NO_TLSEXT
 349                 if (s->tlsext_status_expected)
 350                     s->state = SSL3_ST_SW_CERT_STATUS_A;
 351                 else
 352                     s->state = SSL3_ST_SW_KEY_EXCH_A;
 353             } else {
 354                 skip = 1;
 355                 s->state = SSL3_ST_SW_KEY_EXCH_A;
 356             }
 357 #else
 358             } else
 359                 skip = 1;
 360
 361             s->state = SSL3_ST_SW_KEY_EXCH_A;
 362 #endif
 363             s->init_num = 0;
 364             break;
 365
 366         case SSL3_ST_SW_KEY_EXCH_A:
 367         case SSL3_ST_SW_KEY_EXCH_B:
 368             l = s->s3->tmp.new_cipher->algorithms;
 369
 370             /*
 371              * clear this, it may get reset by send_server_key_exchange
 372              */
 373             s->s3->tmp.use_rsa_tmp = 0;
 374
 375             /*
 376              * only send if a DH key exchange, fortezza or RSA but we have a
 377              * sign only certificate
 378              */
 379             if ((l & (SSL_DH | SSL_kFZA))
 380                 || ((l & SSL_kRSA)
 381                     && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 382                         || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 383                             && EVP_PKEY_size(s->cert->pkeys
 384                                              [SSL_PKEY_RSA_ENC].privatekey) *
 385                             8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 386                         )
 387                     )
 388                 )
 389                 ) {
 390                 dtls1_start_timer(s);
 391                 ret = dtls1_send_server_key_exchange(s);
 392                 if (ret <= 0)
 393                     goto end;
 394             } else
 395                 skip = 1;
 396
 397             s->state = SSL3_ST_SW_CERT_REQ_A;
 398             s->init_num = 0;
 399             break;
 400
 401         case SSL3_ST_SW_CERT_REQ_A:
 402         case SSL3_ST_SW_CERT_REQ_B:
 403             if (                /* don't request cert unless asked for it: */
 404                    !(s->verify_mode & SSL_VERIFY_PEER) ||
 405                    /*
 406                     * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
 407                     * during re-negotiation:
 408                     */
 409                    ((s->session->peer != NULL) &&
 410                     (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 411                    /*
 412                     * never request cert in anonymous ciphersuites (see
 413                     * section "Certificate request" in SSL 3 drafts and in
 414                     * RFC 2246):
 415                     */
 416                    ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 417                     /*
 418                      * ... except when the application insists on
 419                      * verification (against the specs, but s3_clnt.c accepts
 420                      * this for SSL 3)
 421                      */
 422                     !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 423                    /*
 424                     * never request cert in Kerberos ciphersuites
 425                     */
 426                    (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5)) {
 427                 /* no cert request */
 428                 skip = 1;
 429                 s->s3->tmp.cert_request = 0;
 430                 s->state = SSL3_ST_SW_SRVR_DONE_A;
 431             } else {
 432                 s->s3->tmp.cert_request = 1;
 433                 dtls1_start_timer(s);
 434                 ret = dtls1_send_certificate_request(s);
 435                 if (ret <= 0)
 436                     goto end;
 437 #ifndef NETSCAPE_HANG_BUG
 438                 s->state = SSL3_ST_SW_SRVR_DONE_A;
 439 #else
 440                 s->state = SSL3_ST_SW_FLUSH;
 441                 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
 442 #endif
 443                 s->init_num = 0;
 444             }
 445             break;
 446
 447         case SSL3_ST_SW_SRVR_DONE_A:
 448         case SSL3_ST_SW_SRVR_DONE_B:
 449             dtls1_start_timer(s);
 450             ret = dtls1_send_server_done(s);
 451             if (ret <= 0)
 452                 goto end;
 453             s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
 454             s->state = SSL3_ST_SW_FLUSH;
 455             s->init_num = 0;
 456             break;
 457
 458         case SSL3_ST_SW_FLUSH:
 459             s->rwstate = SSL_WRITING;
 460             if (BIO_flush(s->wbio) <= 0) {
 461                 ret = -1;
 462                 goto end;
 463             }
 464             s->rwstate = SSL_NOTHING;
 465             s->state = s->s3->tmp.next_state;
 466             break;
 467
 468         case SSL3_ST_SR_CERT_A:
 469         case SSL3_ST_SR_CERT_B:
 470             /* Check for second client hello (MS SGC) */
 471             ret = ssl3_check_client_hello(s);
 472             if (ret <= 0)
 473                 goto end;
 474             if (ret == 2) {
 475                 dtls1_stop_timer(s);
 476                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 477             } else {
 478                 if (s->s3->tmp.cert_request) {
 479                     ret = ssl3_get_client_certificate(s);
 480                     if (ret <= 0)
 481                         goto end;
 482                 }
 483                 s->init_num = 0;
 484                 s->state = SSL3_ST_SR_KEY_EXCH_A;
 485             }
 486             break;
 487
 488         case SSL3_ST_SR_KEY_EXCH_A:
 489         case SSL3_ST_SR_KEY_EXCH_B:
 490             ret = ssl3_get_client_key_exchange(s);
 491             if (ret <= 0)
 492                 goto end;
 493             s->state = SSL3_ST_SR_CERT_VRFY_A;
 494             s->init_num = 0;
 495
 496             /*
 497              * We need to get hashes here so if there is a client cert, it
 498              * can be verified
 499              */
 500             s->method->ssl3_enc->cert_verify_mac(s,
 501                                                  &(s->s3->finish_dgst1),
 502                                                  &(s->s3->
 503                                                    tmp.cert_verify_md[0]));
 504             s->method->ssl3_enc->cert_verify_mac(s, &(s->s3->finish_dgst2),
 505                                                  &(s->s3->
 506                                                    tmp.cert_verify_md
 507                                                    [MD5_DIGEST_LENGTH]));
 508
 509             break;
 510
 511         case SSL3_ST_SR_CERT_VRFY_A:
 512         case SSL3_ST_SR_CERT_VRFY_B:
 513
 514             s->d1->change_cipher_spec_ok = 1;
 515             /* we should decide if we expected this one */
 516             ret = ssl3_get_cert_verify(s);
 517             if (ret <= 0)
 518                 goto end;
 519
 520             s->state = SSL3_ST_SR_FINISHED_A;
 521             s->init_num = 0;
 522             break;
 523
 524         case SSL3_ST_SR_FINISHED_A:
 525         case SSL3_ST_SR_FINISHED_B:
 526             s->d1->change_cipher_spec_ok = 1;
 527             ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A,
 528                                     SSL3_ST_SR_FINISHED_B);
 529             if (ret <= 0)
 530                 goto end;
 531             dtls1_stop_timer(s);
 532             if (s->hit)
 533                 s->state = SSL_ST_OK;
 534 #ifndef OPENSSL_NO_TLSEXT
 535             else if (s->tlsext_ticket_expected)
 536                 s->state = SSL3_ST_SW_SESSION_TICKET_A;
 537 #endif
 538             else
 539                 s->state = SSL3_ST_SW_CHANGE_A;
 540             s->init_num = 0;
 541             break;
 542
 543 #ifndef OPENSSL_NO_TLSEXT
 544         case SSL3_ST_SW_SESSION_TICKET_A:
 545         case SSL3_ST_SW_SESSION_TICKET_B:
 546             ret = dtls1_send_newsession_ticket(s);
 547             if (ret <= 0)
 548                 goto end;
 549             s->state = SSL3_ST_SW_CHANGE_A;
 550             s->init_num = 0;
 551             break;
 552
 553         case SSL3_ST_SW_CERT_STATUS_A:
 554         case SSL3_ST_SW_CERT_STATUS_B:
 555             ret = ssl3_send_cert_status(s);
 556             if (ret <= 0)
 557                 goto end;
 558             s->state = SSL3_ST_SW_KEY_EXCH_A;
 559             s->init_num = 0;
 560             break;
 561
 562 #endif
 563
 564         case SSL3_ST_SW_CHANGE_A:
 565         case SSL3_ST_SW_CHANGE_B:
 566
 567             s->session->cipher = s->s3->tmp.new_cipher;
 568             if (!s->method->ssl3_enc->setup_key_block(s)) {
 569                 ret = -1;
 570                 goto end;
 571             }
 572
 573             ret = dtls1_send_change_cipher_spec(s,
 574                                                 SSL3_ST_SW_CHANGE_A,
 575                                                 SSL3_ST_SW_CHANGE_B);
 576
 577             if (ret <= 0)
 578                 goto end;
 579             s->state = SSL3_ST_SW_FINISHED_A;
 580             s->init_num = 0;
 581
 582             if (!s->method->ssl3_enc->change_cipher_state(s,
 583                                                           SSL3_CHANGE_CIPHER_SERVER_WRITE))
 584             {
 585                 ret = -1;
 586                 goto end;
 587             }
 588
 589             dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 590             break;
 591
 592         case SSL3_ST_SW_FINISHED_A:
 593         case SSL3_ST_SW_FINISHED_B:
 594             ret = dtls1_send_finished(s,
 595                                       SSL3_ST_SW_FINISHED_A,
 596                                       SSL3_ST_SW_FINISHED_B,
 597                                       s->method->
 598                                       ssl3_enc->server_finished_label,
 599                                       s->method->
 600                                       ssl3_enc->server_finished_label_len);
 601             if (ret <= 0)
 602                 goto end;
 603             s->state = SSL3_ST_SW_FLUSH;
 604             if (s->hit)
 605                 s->s3->tmp.next_state = SSL3_ST_SR_FINISHED_A;
 606             else
 607                 s->s3->tmp.next_state = SSL_ST_OK;
 608             s->init_num = 0;
 609             break;
 610
 611         case SSL_ST_OK:
 612             /* clean a few things up */
 613             ssl3_cleanup_key_block(s);
 614
 615 #if 0
 616             BUF_MEM_free(s->init_buf);
 617             s->init_buf = NULL;
 618 #endif
 619
 620             /* remove buffering on output */
 621             ssl_free_wbio_buffer(s);
 622
 623             s->init_num = 0;
 624
 625             if (s->new_session == 2) { /* skipped if we just sent a
 626                                         * HelloRequest */
 627                 /*
 628                  * actually not necessarily a 'new' session unless
 629                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set
 630                  */
 631
 632                 s->new_session = 0;
 633
 634                 ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
 635
 636                 s->ctx->stats.sess_accept_good++;
 637                 /* s->server=1; */
 638                 s->handshake_func = dtls1_accept;
 639
 640                 if (cb != NULL)
 641                     cb(s, SSL_CB_HANDSHAKE_DONE, 1);
 642             }
 643
 644             ret = 1;
 645
 646             /* done handshaking, next message is client hello */
 647             s->d1->handshake_read_seq = 0;
 648             /* next message is server hello */
 649             s->d1->handshake_write_seq = 0;
 650             s->d1->next_handshake_write_seq = 0;
 651             goto end;
 652             /* break; */
 653
 654         default:
 655             SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_UNKNOWN_STATE);
 656             ret = -1;
 657             goto end;
 658             /* break; */
 659         }
 660
 661         if (!s->s3->tmp.reuse_message && !skip) {
 662             if (s->debug) {
 663                 if ((ret = BIO_flush(s->wbio)) <= 0)
 664                     goto end;
 665             }
 666
 667             if ((cb != NULL) && (s->state != state)) {
 668                 new_state = s->state;
 669                 s->state = state;
 670                 cb(s, SSL_CB_ACCEPT_LOOP, 1);
 671                 s->state = new_state;
 672             }
 673         }
 674         skip = 0;
 675     }
 676  end:
 677     /* BIO_flush(s->wbio); */
 678
 679     s->in_handshake--;
 680     if (cb != NULL)
 681         cb(s, SSL_CB_ACCEPT_EXIT, ret);
 682     return (ret);
 683 }
 684
 685 int dtls1_send_hello_request(SSL *s)
 686 {
 687     unsigned char *p;
 688
 689     if (s->state == SSL3_ST_SW_HELLO_REQ_A) {
 690         p = (unsigned char *)s->init_buf->data;
 691         p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 692
 693         s->state = SSL3_ST_SW_HELLO_REQ_B;
 694         /* number of bytes to write */
 695         s->init_num = DTLS1_HM_HEADER_LENGTH;
 696         s->init_off = 0;
 697
 698         /*
 699          * no need to buffer this message, since there are no retransmit
 700          * requests for it
 701          */
 702     }
 703
 704     /* SSL3_ST_SW_HELLO_REQ_B */
 705     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
 706 }
 707
 708 int dtls1_send_hello_verify_request(SSL *s)
 709 {
 710     unsigned int msg_len;
 711     unsigned char *msg, *buf, *p;
 712
 713     if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) {
 714         buf = (unsigned char *)s->init_buf->data;
 715
 716         msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 717         if (s->client_version == DTLS1_BAD_VER)
 718             *(p++) = DTLS1_BAD_VER >> 8, *(p++) = DTLS1_BAD_VER & 0xff;
 719         else
 720             *(p++) = s->version >> 8, *(p++) = s->version & 0xFF;
 721
 722         if (s->ctx->app_gen_cookie_cb == NULL ||
 723             s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 724                                       &(s->d1->cookie_len)) == 0) {
 725             SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,
 726                    ERR_R_INTERNAL_ERROR);
 727             return 0;
 728         }
 729
 730         *(p++) = (unsigned char)s->d1->cookie_len;
 731         memcpy(p, s->d1->cookie, s->d1->cookie_len);
 732         p += s->d1->cookie_len;
 733         msg_len = p - msg;
 734
 735         dtls1_set_message_header(s, buf,
 736                                  DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0,
 737                                  msg_len);
 738
 739         s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 740         /* number of bytes to write */
 741         s->init_num = p - buf;
 742         s->init_off = 0;
 743     }
 744
 745     /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 746     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
 747 }
 748
 749 int dtls1_send_server_hello(SSL *s)
 750 {
 751     unsigned char *buf;
 752     unsigned char *p, *d;
 753     int i;
 754     unsigned int sl;
 755     unsigned long l, Time;
 756
 757     if (s->state == SSL3_ST_SW_SRVR_HELLO_A) {
 758         buf = (unsigned char *)s->init_buf->data;
 759         p = s->s3->server_random;
 760         Time = (unsigned long)time(NULL); /* Time */
 761         l2n(Time, p);
 762         RAND_pseudo_bytes(p, SSL3_RANDOM_SIZE - 4);
 763         /* Do the message type and length last */
 764         d = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 765
 766         if (s->client_version == DTLS1_BAD_VER)
 767             *(p++) = DTLS1_BAD_VER >> 8, *(p++) = DTLS1_BAD_VER & 0xff;
 768         else
 769             *(p++) = s->version >> 8, *(p++) = s->version & 0xff;
 770
 771         /* Random stuff */
 772         memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE);
 773         p += SSL3_RANDOM_SIZE;
 774
 775         /*
 776          * now in theory we have 3 options to sending back the session id.
 777          * If it is a re-use, we send back the old session-id, if it is a new
 778          * session, we send back the new session-id or we send back a 0
 779          * length session-id if we want it to be single use. Currently I will
 780          * not implement the '0' length session-id 12-Jan-98 - I'll now
 781          * support the '0' length stuff.
 782          */
 783         if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 784             s->session->session_id_length = 0;
 785
 786         sl = s->session->session_id_length;
 787         if (sl > sizeof s->session->session_id) {
 788             SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 789             return -1;
 790         }
 791         *(p++) = sl;
 792         memcpy(p, s->session->session_id, sl);
 793         p += sl;
 794
 795         /* put the cipher */
 796         if (s->s3->tmp.new_cipher == NULL)
 797             return -1;
 798         i = ssl3_put_cipher_by_char(s->s3->tmp.new_cipher, p);
 799         p += i;
 800
 801         /* put the compression method */
 802 #ifdef OPENSSL_NO_COMP
 803         *(p++) = 0;
 804 #else
 805         if (s->s3->tmp.new_compression == NULL)
 806             *(p++) = 0;
 807         else
 808             *(p++) = s->s3->tmp.new_compression->id;
 809 #endif
 810
 811 #ifndef OPENSSL_NO_TLSEXT
 812         if ((p =
 813              ssl_add_serverhello_tlsext(s, p,
 814                                         buf + SSL3_RT_MAX_PLAIN_LENGTH)) ==
 815             NULL) {
 816             SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 817             return -1;
 818         }
 819 #endif
 820
 821         /* do the header */
 822         l = (p - d);
 823         d = buf;
 824
 825         d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 826
 827         s->state = SSL3_ST_SW_SRVR_HELLO_B;
 828         /* number of bytes to write */
 829         s->init_num = p - buf;
 830         s->init_off = 0;
 831
 832         /* buffer the message to handle re-xmits */
 833         dtls1_buffer_message(s, 0);
 834     }
 835
 836     /* SSL3_ST_SW_SRVR_HELLO_B */
 837     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
 838 }
 839
 840 int dtls1_send_server_done(SSL *s)
 841 {
 842     unsigned char *p;
 843
 844     if (s->state == SSL3_ST_SW_SRVR_DONE_A) {
 845         p = (unsigned char *)s->init_buf->data;
 846
 847         /* do the header */
 848         p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 849
 850         s->state = SSL3_ST_SW_SRVR_DONE_B;
 851         /* number of bytes to write */
 852         s->init_num = DTLS1_HM_HEADER_LENGTH;
 853         s->init_off = 0;
 854
 855         /* buffer the message to handle re-xmits */
 856         dtls1_buffer_message(s, 0);
 857     }
 858
 859     /* SSL3_ST_SW_SRVR_DONE_B */
 860     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
 861 }
 862
 863 int dtls1_send_server_key_exchange(SSL *s)
 864 {
 865 #ifndef OPENSSL_NO_RSA
 866     unsigned char *q;
 867     int j, num;
 868     RSA *rsa;
 869     unsigned char md_buf[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
 870     unsigned int u;
 871 #endif
 872 #ifndef OPENSSL_NO_DH
 873     DH *dh = NULL, *dhp;
 874 #endif
 875     EVP_PKEY *pkey;
 876     unsigned char *p, *d;
 877     int al, i;
 878     unsigned long type;
 879     int n;
 880     CERT *cert;
 881     BIGNUM *r[4];
 882     int nr[4], kn;
 883     BUF_MEM *buf;
 884     EVP_MD_CTX md_ctx;
 885
 886     EVP_MD_CTX_init(&md_ctx);
 887     if (s->state == SSL3_ST_SW_KEY_EXCH_A) {
 888         type = s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 889         cert = s->cert;
 890
 891         buf = s->init_buf;
 892
 893         r[0] = r[1] = r[2] = r[3] = NULL;
 894         n = 0;
 895 #ifndef OPENSSL_NO_RSA
 896         if (type & SSL_kRSA) {
 897             rsa = cert->rsa_tmp;
 898             if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) {
 899                 rsa = s->cert->rsa_tmp_cb(s,
 900                                           SSL_C_IS_EXPORT(s->s3->
 901                                                           tmp.new_cipher),
 902                                           SSL_C_EXPORT_PKEYLENGTH(s->s3->
 903                                                                   tmp.new_cipher));
 904                 if (rsa == NULL) {
 905                     al = SSL_AD_HANDSHAKE_FAILURE;
 906                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 907                            SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 908                     goto f_err;
 909                 }
 910                 RSA_up_ref(rsa);
 911                 cert->rsa_tmp = rsa;
 912             }
 913             if (rsa == NULL) {
 914                 al = SSL_AD_HANDSHAKE_FAILURE;
 915                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 916                        SSL_R_MISSING_TMP_RSA_KEY);
 917                 goto f_err;
 918             }
 919             r[0] = rsa->n;
 920             r[1] = rsa->e;
 921             s->s3->tmp.use_rsa_tmp = 1;
 922         } else
 923 #endif
 924 #ifndef OPENSSL_NO_DH
 925         if (type & SSL_kEDH) {
 926             dhp = cert->dh_tmp;
 927             if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 928                 dhp = s->cert->dh_tmp_cb(s,
 929                                          SSL_C_IS_EXPORT(s->s3->
 930                                                          tmp.new_cipher),
 931                                          SSL_C_EXPORT_PKEYLENGTH(s->s3->
 932                                                                  tmp.new_cipher));
 933             if (dhp == NULL) {
 934                 al = SSL_AD_HANDSHAKE_FAILURE;
 935                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 936                        SSL_R_MISSING_TMP_DH_KEY);
 937                 goto f_err;
 938             }
 939
 940             if (s->s3->tmp.dh != NULL) {
 941                 DH_free(dh);
 942                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 943                        ERR_R_INTERNAL_ERROR);
 944                 goto err;
 945             }
 946
 947             if ((dh = DHparams_dup(dhp)) == NULL) {
 948                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB);
 949                 goto err;
 950             }
 951
 952             s->s3->tmp.dh = dh;
 953             if ((dhp->pub_key == NULL ||
 954                  dhp->priv_key == NULL ||
 955                  (s->options & SSL_OP_SINGLE_DH_USE))) {
 956                 if (!DH_generate_key(dh)) {
 957                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 958                            ERR_R_DH_LIB);
 959                     goto err;
 960                 }
 961             } else {
 962                 dh->pub_key = BN_dup(dhp->pub_key);
 963                 dh->priv_key = BN_dup(dhp->priv_key);
 964                 if ((dh->pub_key == NULL) || (dh->priv_key == NULL)) {
 965                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 966                            ERR_R_DH_LIB);
 967                     goto err;
 968                 }
 969             }
 970             r[0] = dh->p;
 971             r[1] = dh->g;
 972             r[2] = dh->pub_key;
 973         } else
 974 #endif
 975         {
 976             al = SSL_AD_HANDSHAKE_FAILURE;
 977             SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 978                    SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 979             goto f_err;
 980         }
 981         for (i = 0; r[i] != NULL; i++) {
 982             nr[i] = BN_num_bytes(r[i]);
 983             n += 2 + nr[i];
 984         }
 985
 986         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) {
 987             if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher))
 988                 == NULL) {
 989                 al = SSL_AD_DECODE_ERROR;
 990                 goto f_err;
 991             }
 992             kn = EVP_PKEY_size(pkey);
 993         } else {
 994             pkey = NULL;
 995             kn = 0;
 996         }
 997
 998         if (!BUF_MEM_grow_clean(buf, n + DTLS1_HM_HEADER_LENGTH + kn)) {
 999             SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_BUF);
1000             goto err;
1001         }
1002         d = (unsigned char *)s->init_buf->data;
1003         p = &(d[DTLS1_HM_HEADER_LENGTH]);
1004
1005         for (i = 0; r[i] != NULL; i++) {
1006             s2n(nr[i], p);
1007             BN_bn2bin(r[i], p);
1008             p += nr[i];
1009         }
1010
1011         /* not anonymous */
1012         if (pkey != NULL) {
1013             /*
1014              * n is the length of the params, they start at
1015              * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space at the
1016              * end.
1017              */
1018 #ifndef OPENSSL_NO_RSA
1019             if (pkey->type == EVP_PKEY_RSA) {
1020                 q = md_buf;
1021                 j = 0;
1022                 for (num = 2; num > 0; num--) {
1023                     EVP_DigestInit_ex(&md_ctx, (num == 2)
1024                                       ? s->ctx->md5 : s->ctx->sha1, NULL);
1025                     EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]),
1026                                      SSL3_RANDOM_SIZE);
1027                     EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]),
1028                                      SSL3_RANDOM_SIZE);
1029                     EVP_DigestUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]),
1030                                      n);
1031                     EVP_DigestFinal_ex(&md_ctx, q, (unsigned int *)&i);
1032                     q += i;
1033                     j += i;
1034                 }
1035                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1036                              &(p[2]), &u, pkey->pkey.rsa) <= 0) {
1037                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_RSA);
1038                     goto err;
1039                 }
1040                 s2n(u, p);
1041                 n += u + 2;
1042             } else
1043 #endif
1044 #if !defined(OPENSSL_NO_DSA)
1045             if (pkey->type == EVP_PKEY_DSA) {
1046                 /* lets do DSS */
1047                 EVP_SignInit_ex(&md_ctx, EVP_dss1(), NULL);
1048                 EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]),
1049                                SSL3_RANDOM_SIZE);
1050                 EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]),
1051                                SSL3_RANDOM_SIZE);
1052                 EVP_SignUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]), n);
1053                 if (!EVP_SignFinal(&md_ctx, &(p[2]),
1054                                    (unsigned int *)&i, pkey)) {
1055                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_DSA);
1056                     goto err;
1057                 }
1058                 s2n(i, p);
1059                 n += i + 2;
1060             } else
1061 #endif
1062             {
1063                 /* Is this error check actually needed? */
1064                 al = SSL_AD_HANDSHAKE_FAILURE;
1065                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1066                        SSL_R_UNKNOWN_PKEY_TYPE);
1067                 goto f_err;
1068             }
1069         }
1070
1071         d = dtls1_set_message_header(s, d,
1072                                      SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1073
1074         /*
1075          * we should now have things packed up, so lets send it off
1076          */
1077         s->init_num = n + DTLS1_HM_HEADER_LENGTH;
1078         s->init_off = 0;
1079
1080         /* buffer the message to handle re-xmits */
1081         dtls1_buffer_message(s, 0);
1082     }
1083
1084     s->state = SSL3_ST_SW_KEY_EXCH_B;
1085     EVP_MD_CTX_cleanup(&md_ctx);
1086     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1087  f_err:
1088     ssl3_send_alert(s, SSL3_AL_FATAL, al);
1089  err:
1090     EVP_MD_CTX_cleanup(&md_ctx);
1091     return (-1);
1092 }
1093
1094 int dtls1_send_certificate_request(SSL *s)
1095 {
1096     unsigned char *p, *d;
1097     int i, j, nl, off, n;
1098     STACK_OF(X509_NAME) *sk = NULL;
1099     X509_NAME *name;
1100     BUF_MEM *buf;
1101     unsigned int msg_len;
1102
1103     if (s->state == SSL3_ST_SW_CERT_REQ_A) {
1104         buf = s->init_buf;
1105
1106         d = p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1107
1108         /* get the list of acceptable cert types */
1109         p++;
1110         n = ssl3_get_req_cert_type(s, p);
1111         d[0] = n;
1112         p += n;
1113         n++;
1114
1115         off = n;
1116         p += 2;
1117         n += 2;
1118
1119         sk = SSL_get_client_CA_list(s);
1120         nl = 0;
1121         if (sk != NULL) {
1122             for (i = 0; i < sk_X509_NAME_num(sk); i++) {
1123                 name = sk_X509_NAME_value(sk, i);
1124                 j = i2d_X509_NAME(name, NULL);
1125                 if (!BUF_MEM_grow_clean
1126                     (buf, DTLS1_HM_HEADER_LENGTH + n + j + 2)) {
1127                     SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,
1128                            ERR_R_BUF_LIB);
1129                     goto err;
1130                 }
1131                 p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH + n]);
1132                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) {
1133                     s2n(j, p);
1134                     i2d_X509_NAME(name, &p);
1135                     n += 2 + j;
1136                     nl += 2 + j;
1137                 } else {
1138                     d = p;
1139                     i2d_X509_NAME(name, &p);
1140                     j -= 2;
1141                     s2n(j, d);
1142                     j += 2;
1143                     n += j;
1144                     nl += j;
1145                 }
1146             }
1147         }
1148         /* else no CA names */
1149         p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH + off]);
1150         s2n(nl, p);
1151
1152         d = (unsigned char *)buf->data;
1153         *(d++) = SSL3_MT_CERTIFICATE_REQUEST;
1154         l2n3(n, d);
1155         s2n(s->d1->handshake_write_seq, d);
1156         s->d1->handshake_write_seq++;
1157
1158         /*
1159          * we should now have things packed up, so lets send it off
1160          */
1161
1162         s->init_num = n + DTLS1_HM_HEADER_LENGTH;
1163         s->init_off = 0;
1164 #ifdef NETSCAPE_HANG_BUG
1165 /* XXX: what to do about this? */
1166         p = (unsigned char *)s->init_buf->data + s->init_num;
1167
1168         /* do the header */
1169         *(p++) = SSL3_MT_SERVER_DONE;
1170         *(p++) = 0;
1171         *(p++) = 0;
1172         *(p++) = 0;
1173         s->init_num += 4;
1174 #endif
1175
1176         /* XDTLS:  set message header ? */
1177         msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1178         dtls1_set_message_header(s, (void *)s->init_buf->data,
1179                                  SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0,
1180                                  msg_len);
1181
1182         /* buffer the message to handle re-xmits */
1183         dtls1_buffer_message(s, 0);
1184
1185         s->state = SSL3_ST_SW_CERT_REQ_B;
1186     }
1187
1188     /* SSL3_ST_SW_CERT_REQ_B */
1189     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1190  err:
1191     return (-1);
1192 }
1193
1194 int dtls1_send_server_certificate(SSL *s)
1195 {
1196     unsigned long l;
1197     X509 *x;
1198
1199     if (s->state == SSL3_ST_SW_CERT_A) {
1200         x = ssl_get_server_send_cert(s);
1201         if (x == NULL &&
1202             /* VRS: allow null cert if auth == KRB5 */
1203             (s->s3->tmp.new_cipher->algorithms
1204              & (SSL_MKEY_MASK | SSL_AUTH_MASK))
1205             != (SSL_aKRB5 | SSL_kKRB5)) {
1206             SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1207             return (0);
1208         }
1209
1210         l = dtls1_output_cert_chain(s, x);
1211         s->state = SSL3_ST_SW_CERT_B;
1212         s->init_num = (int)l;
1213         s->init_off = 0;
1214
1215         /* buffer the message to handle re-xmits */
1216         dtls1_buffer_message(s, 0);
1217     }
1218
1219     /* SSL3_ST_SW_CERT_B */
1220     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1221 }
1222
1223 #ifndef OPENSSL_NO_TLSEXT
1224 int dtls1_send_newsession_ticket(SSL *s)
1225 {
1226     if (s->state == SSL3_ST_SW_SESSION_TICKET_A) {
1227         unsigned char *p, *senc, *macstart;
1228         int len, slen;
1229         unsigned int hlen, msg_len;
1230         EVP_CIPHER_CTX ctx;
1231         HMAC_CTX hctx;
1232         SSL_CTX *tctx = s->initial_ctx;
1233         unsigned char iv[EVP_MAX_IV_LENGTH];
1234         unsigned char key_name[16];
1235
1236         /* get session encoding length */
1237         slen = i2d_SSL_SESSION(s->session, NULL);
1238         /*
1239          * Some length values are 16 bits, so forget it if session is too
1240          * long
1241          */
1242         if (slen > 0xFF00)
1243             return -1;
1244         /*
1245          * Grow buffer if need be: the length calculation is as follows 12
1246          * (DTLS handshake message header) + 4 (ticket lifetime hint) + 2
1247          * (ticket length) + 16 (key name) + max_iv_len (iv length) +
1248          * session_length + max_enc_block_size (max encrypted session length)
1249          * + max_md_size (HMAC).
1250          */
1251         if (!BUF_MEM_grow(s->init_buf,
1252                           DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1253                           EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1254             return -1;
1255         senc = OPENSSL_malloc(slen);
1256         if (!senc)
1257             return -1;
1258         p = senc;
1259         i2d_SSL_SESSION(s->session, &p);
1260
1261         p = (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1262         EVP_CIPHER_CTX_init(&ctx);
1263         HMAC_CTX_init(&hctx);
1264         /*
1265          * Initialize HMAC and cipher contexts. If callback present it does
1266          * all the work otherwise use generated values from parent ctx.
1267          */
1268         if (tctx->tlsext_ticket_key_cb) {
1269             if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1270                                            &hctx, 1) < 0) {
1271                 OPENSSL_free(senc);
1272                 return -1;
1273             }
1274         } else {
1275             RAND_pseudo_bytes(iv, 16);
1276             EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1277                                tctx->tlsext_tick_aes_key, iv);
1278             HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1279                          tlsext_tick_md(), NULL);
1280             memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1281         }
1282         l2n(s->session->tlsext_tick_lifetime_hint, p);
1283         /* Skip ticket length for now */
1284         p += 2;
1285         /* Output key name */
1286         macstart = p;
1287         memcpy(p, key_name, 16);
1288         p += 16;
1289         /* output IV */
1290         memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1291         p += EVP_CIPHER_CTX_iv_length(&ctx);
1292         /* Encrypt session data */
1293         EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1294         p += len;
1295         EVP_EncryptFinal(&ctx, p, &len);
1296         p += len;
1297         EVP_CIPHER_CTX_cleanup(&ctx);
1298
1299         HMAC_Update(&hctx, macstart, p - macstart);
1300         HMAC_Final(&hctx, p, &hlen);
1301         HMAC_CTX_cleanup(&hctx);
1302
1303         p += hlen;
1304         /* Now write out lengths: p points to end of data written */
1305         /* Total length */
1306         len = p - (unsigned char *)(s->init_buf->data);
1307         /* Ticket length */
1308         p = (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1309         s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1310
1311         /* number of bytes to write */
1312         s->init_num = len;
1313         s->state = SSL3_ST_SW_SESSION_TICKET_B;
1314         s->init_off = 0;
1315         OPENSSL_free(senc);
1316
1317         /* XDTLS:  set message header ? */
1318         msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1319         dtls1_set_message_header(s, (void *)s->init_buf->data,
1320                                  SSL3_MT_NEWSESSION_TICKET, msg_len, 0,
1321                                  msg_len);
1322
1323         /* buffer the message to handle re-xmits */
1324         dtls1_buffer_message(s, 0);
1325     }
1326
1327     /* SSL3_ST_SW_SESSION_TICKET_B */
1328     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1329 }
1330 #endif