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) 1999-2007 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 #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 #include <openssl/bn.h>
 125 #ifndef OPENSSL_NO_DH
 126 # include <openssl/dh.h>
 127 #endif
 128
 129 static const SSL_METHOD *dtls1_get_server_method(int ver);
 130 static int dtls1_send_hello_verify_request(SSL *s);
 131
 132 static const SSL_METHOD *dtls1_get_server_method(int ver)
 133 {
 134     if (ver == DTLS1_VERSION)
 135         return (DTLSv1_server_method());
 136     else
 137         return (NULL);
 138 }
 139
 140 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
 141                           dtls1_accept,
 142                           ssl_undefined_function, dtls1_get_server_method)
 143
 144 int dtls1_accept(SSL *s)
 145 {
 146     BUF_MEM *buf;
 147     unsigned long Time = (unsigned long)time(NULL);
 148     void (*cb) (const SSL *ssl, int type, int val) = NULL;
 149     unsigned long alg_k;
 150     int ret = -1;
 151     int new_state, state, skip = 0;
 152     int listen;
 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     listen = s->d1->listen;
 168
 169     /* init things to blank */
 170     s->in_handshake++;
 171     if (!SSL_in_init(s) || SSL_in_before(s))
 172         SSL_clear(s);
 173
 174     s->d1->listen = listen;
 175 #ifndef OPENSSL_NO_SCTP
 176     /*
 177      * Notify SCTP BIO socket to enter handshake mode and prevent stream
 178      * identifier other than 0. Will be ignored if no SCTP is used.
 179      */
 180     BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
 181              s->in_handshake, NULL);
 182 #endif
 183
 184     if (s->cert == NULL) {
 185         SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_NO_CERTIFICATE_SET);
 186         return (-1);
 187     }
 188 #ifndef OPENSSL_NO_HEARTBEATS
 189     /*
 190      * If we're awaiting a HeartbeatResponse, pretend we already got and
 191      * don't await it anymore, because Heartbeats don't make sense during
 192      * handshakes anyway.
 193      */
 194     if (s->tlsext_hb_pending) {
 195         dtls1_stop_timer(s);
 196         s->tlsext_hb_pending = 0;
 197         s->tlsext_hb_seq++;
 198     }
 199 #endif
 200
 201     for (;;) {
 202         state = s->state;
 203
 204         switch (s->state) {
 205         case SSL_ST_RENEGOTIATE:
 206             s->renegotiate = 1;
 207             /* s->state=SSL_ST_ACCEPT; */
 208
 209         case SSL_ST_BEFORE:
 210         case SSL_ST_ACCEPT:
 211         case SSL_ST_BEFORE | SSL_ST_ACCEPT:
 212         case SSL_ST_OK | SSL_ST_ACCEPT:
 213
 214             s->server = 1;
 215             if (cb != NULL)
 216                 cb(s, SSL_CB_HANDSHAKE_START, 1);
 217
 218             if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) {
 219                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
 220                 return -1;
 221             }
 222             s->type = SSL_ST_ACCEPT;
 223
 224             if (s->init_buf == NULL) {
 225                 if ((buf = BUF_MEM_new()) == NULL) {
 226                     ret = -1;
 227                     s->state = SSL_ST_ERR;
 228                     goto end;
 229                 }
 230                 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
 231                     BUF_MEM_free(buf);
 232                     ret = -1;
 233                     s->state = SSL_ST_ERR;
 234                     goto end;
 235                 }
 236                 s->init_buf = buf;
 237             }
 238
 239             if (!ssl3_setup_buffers(s)) {
 240                 ret = -1;
 241                 s->state = SSL_ST_ERR;
 242                 goto end;
 243             }
 244
 245             s->init_num = 0;
 246             s->d1->change_cipher_spec_ok = 0;
 247             /*
 248              * Should have been reset by ssl3_get_finished, too.
 249              */
 250             s->s3->change_cipher_spec = 0;
 251
 252             if (s->state != SSL_ST_RENEGOTIATE) {
 253                 /*
 254                  * Ok, we now need to push on a buffering BIO so that the
 255                  * output is sent in a way that TCP likes :-) ...but not with
 256                  * SCTP :-)
 257                  */
 258 #ifndef OPENSSL_NO_SCTP
 259                 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
 260 #endif
 261                     if (!ssl_init_wbio_buffer(s, 1)) {
 262                         ret = -1;
 263                         s->state = SSL_ST_ERR;
 264                         goto end;
 265                     }
 266
 267                 ssl3_init_finished_mac(s);
 268                 s->state = SSL3_ST_SR_CLNT_HELLO_A;
 269                 s->ctx->stats.sess_accept++;
 270             } else {
 271                 /*
 272                  * s->state == SSL_ST_RENEGOTIATE, we will just send a
 273                  * HelloRequest
 274                  */
 275                 s->ctx->stats.sess_accept_renegotiate++;
 276                 s->state = SSL3_ST_SW_HELLO_REQ_A;
 277             }
 278
 279             break;
 280
 281         case SSL3_ST_SW_HELLO_REQ_A:
 282         case SSL3_ST_SW_HELLO_REQ_B:
 283
 284             s->shutdown = 0;
 285             dtls1_clear_record_buffer(s);
 286             dtls1_start_timer(s);
 287             ret = dtls1_send_hello_request(s);
 288             if (ret <= 0)
 289                 goto end;
 290             s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
 291             s->state = SSL3_ST_SW_FLUSH;
 292             s->init_num = 0;
 293
 294             ssl3_init_finished_mac(s);
 295             break;
 296
 297         case SSL3_ST_SW_HELLO_REQ_C:
 298             s->state = SSL_ST_OK;
 299             break;
 300
 301         case SSL3_ST_SR_CLNT_HELLO_A:
 302         case SSL3_ST_SR_CLNT_HELLO_B:
 303         case SSL3_ST_SR_CLNT_HELLO_C:
 304
 305             s->shutdown = 0;
 306             ret = ssl3_get_client_hello(s);
 307             if (ret <= 0)
 308                 goto end;
 309             dtls1_stop_timer(s);
 310
 311             if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
 312                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
 313             else
 314                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
 315
 316             s->init_num = 0;
 317
 318             /*
 319              * Reflect ClientHello sequence to remain stateless while
 320              * listening
 321              */
 322             if (listen) {
 323                 memcpy(s->s3->write_sequence, s->s3->read_sequence,
 324                        sizeof(s->s3->write_sequence));
 325             }
 326
 327             /* If we're just listening, stop here */
 328             if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) {
 329                 ret = 2;
 330                 s->d1->listen = 0;
 331                 /*
 332                  * Set expected sequence numbers to continue the handshake.
 333                  */
 334                 s->d1->handshake_read_seq = 2;
 335                 s->d1->handshake_write_seq = 1;
 336                 s->d1->next_handshake_write_seq = 1;
 337                 goto end;
 338             }
 339
 340             break;
 341
 342         case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
 343         case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
 344
 345             ret = dtls1_send_hello_verify_request(s);
 346             if (ret <= 0)
 347                 goto end;
 348             s->state = SSL3_ST_SW_FLUSH;
 349             s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
 350
 351             /* HelloVerifyRequest resets Finished MAC */
 352             if (s->version != DTLS1_BAD_VER)
 353                 ssl3_init_finished_mac(s);
 354             break;
 355
 356 #ifndef OPENSSL_NO_SCTP
 357         case DTLS1_SCTP_ST_SR_READ_SOCK:
 358
 359             if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
 360                 s->s3->in_read_app_data = 2;
 361                 s->rwstate = SSL_READING;
 362                 BIO_clear_retry_flags(SSL_get_rbio(s));
 363                 BIO_set_retry_read(SSL_get_rbio(s));
 364                 ret = -1;
 365                 goto end;
 366             }
 367
 368             s->state = SSL3_ST_SR_FINISHED_A;
 369             break;
 370
 371         case DTLS1_SCTP_ST_SW_WRITE_SOCK:
 372             ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
 373             if (ret < 0)
 374                 goto end;
 375
 376             if (ret == 0) {
 377                 if (s->d1->next_state != SSL_ST_OK) {
 378                     s->s3->in_read_app_data = 2;
 379                     s->rwstate = SSL_READING;
 380                     BIO_clear_retry_flags(SSL_get_rbio(s));
 381                     BIO_set_retry_read(SSL_get_rbio(s));
 382                     ret = -1;
 383                     goto end;
 384                 }
 385             }
 386
 387             s->state = s->d1->next_state;
 388             break;
 389 #endif
 390
 391         case SSL3_ST_SW_SRVR_HELLO_A:
 392         case SSL3_ST_SW_SRVR_HELLO_B:
 393             s->renegotiate = 2;
 394             dtls1_start_timer(s);
 395             ret = dtls1_send_server_hello(s);
 396             if (ret <= 0)
 397                 goto end;
 398
 399             if (s->hit) {
 400 #ifndef OPENSSL_NO_SCTP
 401                 /*
 402                  * Add new shared key for SCTP-Auth, will be ignored if no
 403                  * SCTP used.
 404                  */
 405                 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 406                          DTLS1_SCTP_AUTH_LABEL);
 407
 408                 if (SSL_export_keying_material(s, sctpauthkey,
 409                         sizeof(sctpauthkey), labelbuffer,
 410                         sizeof(labelbuffer), NULL, 0, 0) <= 0) {
 411                     ret = -1;
 412                     s->state = SSL_ST_ERR;
 413                     goto end;
 414                 }
 415
 416                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 417                          sizeof(sctpauthkey), sctpauthkey);
 418 #endif
 419 #ifndef OPENSSL_NO_TLSEXT
 420                 if (s->tlsext_ticket_expected)
 421                     s->state = SSL3_ST_SW_SESSION_TICKET_A;
 422                 else
 423                     s->state = SSL3_ST_SW_CHANGE_A;
 424 #else
 425                 s->state = SSL3_ST_SW_CHANGE_A;
 426 #endif
 427             } else
 428                 s->state = SSL3_ST_SW_CERT_A;
 429             s->init_num = 0;
 430             break;
 431
 432         case SSL3_ST_SW_CERT_A:
 433         case SSL3_ST_SW_CERT_B:
 434             /* Check if it is anon DH or normal PSK */
 435             if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
 436                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
 437                 dtls1_start_timer(s);
 438                 ret = dtls1_send_server_certificate(s);
 439                 if (ret <= 0)
 440                     goto end;
 441 #ifndef OPENSSL_NO_TLSEXT
 442                 if (s->tlsext_status_expected)
 443                     s->state = SSL3_ST_SW_CERT_STATUS_A;
 444                 else
 445                     s->state = SSL3_ST_SW_KEY_EXCH_A;
 446             } else {
 447                 skip = 1;
 448                 s->state = SSL3_ST_SW_KEY_EXCH_A;
 449             }
 450 #else
 451             } else
 452                 skip = 1;
 453
 454             s->state = SSL3_ST_SW_KEY_EXCH_A;
 455 #endif
 456             s->init_num = 0;
 457             break;
 458
 459         case SSL3_ST_SW_KEY_EXCH_A:
 460         case SSL3_ST_SW_KEY_EXCH_B:
 461             alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 462
 463             /*
 464              * clear this, it may get reset by
 465              * send_server_key_exchange
 466              */
 467             s->s3->tmp.use_rsa_tmp = 0;
 468
 469             /*
 470              * only send if a DH key exchange or RSA but we have a sign only
 471              * certificate
 472              */
 473             if (0
 474                 /*
 475                  * PSK: send ServerKeyExchange if PSK identity hint if
 476                  * provided
 477                  */
 478 #ifndef OPENSSL_NO_PSK
 479                 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 480 #endif
 481                 || (alg_k & SSL_kEDH)
 482                 || (alg_k & SSL_kEECDH)
 483                 || ((alg_k & SSL_kRSA)
 484                     && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 485                         || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 486                             && EVP_PKEY_size(s->cert->pkeys
 487                                              [SSL_PKEY_RSA_ENC].privatekey) *
 488                             8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 489                         )
 490                     )
 491                 )
 492                 ) {
 493                 dtls1_start_timer(s);
 494                 ret = dtls1_send_server_key_exchange(s);
 495                 if (ret <= 0)
 496                     goto end;
 497             } else
 498                 skip = 1;
 499
 500             s->state = SSL3_ST_SW_CERT_REQ_A;
 501             s->init_num = 0;
 502             break;
 503
 504         case SSL3_ST_SW_CERT_REQ_A:
 505         case SSL3_ST_SW_CERT_REQ_B:
 506             if (                /* don't request cert unless asked for it: */
 507                    !(s->verify_mode & SSL_VERIFY_PEER) ||
 508                    /*
 509                     * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
 510                     * during re-negotiation:
 511                     */
 512                    ((s->session->peer != NULL) &&
 513                     (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 514                    /*
 515                     * never request cert in anonymous ciphersuites (see
 516                     * section "Certificate request" in SSL 3 drafts and in
 517                     * RFC 2246):
 518                     */
 519                    ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 520                     /*
 521                      * ... except when the application insists on
 522                      * verification (against the specs, but s3_clnt.c accepts
 523                      * this for SSL 3)
 524                      */
 525                     !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 526                    /*
 527                     * never request cert in Kerberos ciphersuites
 528                     */
 529                    (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 530                    /*
 531                     * With normal PSK Certificates and Certificate Requests
 532                     * are omitted
 533                     */
 534                    || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
 535                 /* no cert request */
 536                 skip = 1;
 537                 s->s3->tmp.cert_request = 0;
 538                 s->state = SSL3_ST_SW_SRVR_DONE_A;
 539 #ifndef OPENSSL_NO_SCTP
 540                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 541                     s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
 542                     s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
 543                 }
 544 #endif
 545             } else {
 546                 s->s3->tmp.cert_request = 1;
 547                 dtls1_start_timer(s);
 548                 ret = dtls1_send_certificate_request(s);
 549                 if (ret <= 0)
 550                     goto end;
 551 #ifndef NETSCAPE_HANG_BUG
 552                 s->state = SSL3_ST_SW_SRVR_DONE_A;
 553 # ifndef OPENSSL_NO_SCTP
 554                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 555                     s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
 556                     s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
 557                 }
 558 # endif
 559 #else
 560                 s->state = SSL3_ST_SW_FLUSH;
 561                 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
 562 # ifndef OPENSSL_NO_SCTP
 563                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 564                     s->d1->next_state = s->s3->tmp.next_state;
 565                     s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
 566                 }
 567 # endif
 568 #endif
 569                 s->init_num = 0;
 570             }
 571             break;
 572
 573         case SSL3_ST_SW_SRVR_DONE_A:
 574         case SSL3_ST_SW_SRVR_DONE_B:
 575             dtls1_start_timer(s);
 576             ret = dtls1_send_server_done(s);
 577             if (ret <= 0)
 578                 goto end;
 579             s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
 580             s->state = SSL3_ST_SW_FLUSH;
 581             s->init_num = 0;
 582             break;
 583
 584         case SSL3_ST_SW_FLUSH:
 585             s->rwstate = SSL_WRITING;
 586             if (BIO_flush(s->wbio) <= 0) {
 587                 /*
 588                  * If the write error was fatal, stop trying
 589                  */
 590                 if (!BIO_should_retry(s->wbio)) {
 591                     s->rwstate = SSL_NOTHING;
 592                     s->state = s->s3->tmp.next_state;
 593                 }
 594
 595                 ret = -1;
 596                 goto end;
 597             }
 598             s->rwstate = SSL_NOTHING;
 599             s->state = s->s3->tmp.next_state;
 600             break;
 601
 602         case SSL3_ST_SR_CERT_A:
 603         case SSL3_ST_SR_CERT_B:
 604             /* Check for second client hello (MS SGC) */
 605             ret = ssl3_check_client_hello(s);
 606             if (ret <= 0)
 607                 goto end;
 608             if (ret == 2) {
 609                 dtls1_stop_timer(s);
 610                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 611             } else {
 612                 if (s->s3->tmp.cert_request) {
 613                     ret = ssl3_get_client_certificate(s);
 614                     if (ret <= 0)
 615                         goto end;
 616                 }
 617                 s->init_num = 0;
 618                 s->state = SSL3_ST_SR_KEY_EXCH_A;
 619             }
 620             break;
 621
 622         case SSL3_ST_SR_KEY_EXCH_A:
 623         case SSL3_ST_SR_KEY_EXCH_B:
 624             ret = ssl3_get_client_key_exchange(s);
 625             if (ret <= 0)
 626                 goto end;
 627 #ifndef OPENSSL_NO_SCTP
 628             /*
 629              * Add new shared key for SCTP-Auth, will be ignored if no SCTP
 630              * used.
 631              */
 632             snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 633                      DTLS1_SCTP_AUTH_LABEL);
 634
 635             if (SSL_export_keying_material(s, sctpauthkey,
 636                                        sizeof(sctpauthkey), labelbuffer,
 637                                        sizeof(labelbuffer), NULL, 0, 0) <= 0) {
 638                 ret = -1;
 639                 s->state = SSL_ST_ERR;
 640                 goto end;
 641             }
 642
 643             BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 644                      sizeof(sctpauthkey), sctpauthkey);
 645 #endif
 646
 647             s->state = SSL3_ST_SR_CERT_VRFY_A;
 648             s->init_num = 0;
 649
 650             if (ret == 2) {
 651                 /*
 652                  * For the ECDH ciphersuites when the client sends its ECDH
 653                  * pub key in a certificate, the CertificateVerify message is
 654                  * not sent.
 655                  */
 656                 s->state = SSL3_ST_SR_FINISHED_A;
 657                 s->init_num = 0;
 658             } else {
 659                 s->state = SSL3_ST_SR_CERT_VRFY_A;
 660                 s->init_num = 0;
 661
 662                 /*
 663                  * We need to get hashes here so if there is a client cert,
 664                  * it can be verified
 665                  */
 666                 s->method->ssl3_enc->cert_verify_mac(s,
 667                                                      NID_md5,
 668                                                      &(s->s3->
 669                                                        tmp.cert_verify_md
 670                                                        [0]));
 671                 s->method->ssl3_enc->cert_verify_mac(s, NID_sha1,
 672                                                      &(s->s3->
 673                                                        tmp.cert_verify_md
 674                                                        [MD5_DIGEST_LENGTH]));
 675             }
 676             break;
 677
 678         case SSL3_ST_SR_CERT_VRFY_A:
 679         case SSL3_ST_SR_CERT_VRFY_B:
 680             ret = ssl3_get_cert_verify(s);
 681             if (ret <= 0)
 682                 goto end;
 683 #ifndef OPENSSL_NO_SCTP
 684             if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 685                 state == SSL_ST_RENEGOTIATE)
 686                 s->state = DTLS1_SCTP_ST_SR_READ_SOCK;
 687             else
 688 #endif
 689                 s->state = SSL3_ST_SR_FINISHED_A;
 690             s->init_num = 0;
 691             break;
 692
 693         case SSL3_ST_SR_FINISHED_A:
 694         case SSL3_ST_SR_FINISHED_B:
 695             /*
 696              * Enable CCS. Receiving a CCS clears the flag, so make
 697              * sure not to re-enable it to ban duplicates. This *should* be the
 698              * first time we have received one - but we check anyway to be
 699              * cautious.
 700              * s->s3->change_cipher_spec is set when a CCS is
 701              * processed in d1_pkt.c, and remains set until
 702              * the client's Finished message is read.
 703              */
 704             if (!s->s3->change_cipher_spec)
 705                 s->d1->change_cipher_spec_ok = 1;
 706             ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A,
 707                                     SSL3_ST_SR_FINISHED_B);
 708             if (ret <= 0)
 709                 goto end;
 710             dtls1_stop_timer(s);
 711             if (s->hit)
 712                 s->state = SSL_ST_OK;
 713 #ifndef OPENSSL_NO_TLSEXT
 714             else if (s->tlsext_ticket_expected)
 715                 s->state = SSL3_ST_SW_SESSION_TICKET_A;
 716 #endif
 717             else
 718                 s->state = SSL3_ST_SW_CHANGE_A;
 719             s->init_num = 0;
 720             break;
 721
 722 #ifndef OPENSSL_NO_TLSEXT
 723         case SSL3_ST_SW_SESSION_TICKET_A:
 724         case SSL3_ST_SW_SESSION_TICKET_B:
 725             ret = dtls1_send_newsession_ticket(s);
 726             if (ret <= 0)
 727                 goto end;
 728             s->state = SSL3_ST_SW_CHANGE_A;
 729             s->init_num = 0;
 730             break;
 731
 732         case SSL3_ST_SW_CERT_STATUS_A:
 733         case SSL3_ST_SW_CERT_STATUS_B:
 734             ret = ssl3_send_cert_status(s);
 735             if (ret <= 0)
 736                 goto end;
 737             s->state = SSL3_ST_SW_KEY_EXCH_A;
 738             s->init_num = 0;
 739             break;
 740
 741 #endif
 742
 743         case SSL3_ST_SW_CHANGE_A:
 744         case SSL3_ST_SW_CHANGE_B:
 745
 746             s->session->cipher = s->s3->tmp.new_cipher;
 747             if (!s->method->ssl3_enc->setup_key_block(s)) {
 748                 ret = -1;
 749                 s->state = SSL_ST_ERR;
 750                 goto end;
 751             }
 752
 753             ret = dtls1_send_change_cipher_spec(s,
 754                                                 SSL3_ST_SW_CHANGE_A,
 755                                                 SSL3_ST_SW_CHANGE_B);
 756
 757             if (ret <= 0)
 758                 goto end;
 759
 760 #ifndef OPENSSL_NO_SCTP
 761             if (!s->hit) {
 762                 /*
 763                  * Change to new shared key of SCTP-Auth, will be ignored if
 764                  * no SCTP used.
 765                  */
 766                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
 767                          0, NULL);
 768             }
 769 #endif
 770
 771             s->state = SSL3_ST_SW_FINISHED_A;
 772             s->init_num = 0;
 773
 774             if (!s->method->ssl3_enc->change_cipher_state(s,
 775                                                           SSL3_CHANGE_CIPHER_SERVER_WRITE))
 776             {
 777                 ret = -1;
 778                 s->state = SSL_ST_ERR;
 779                 goto end;
 780             }
 781
 782             dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 783             break;
 784
 785         case SSL3_ST_SW_FINISHED_A:
 786         case SSL3_ST_SW_FINISHED_B:
 787             ret = dtls1_send_finished(s,
 788                                       SSL3_ST_SW_FINISHED_A,
 789                                       SSL3_ST_SW_FINISHED_B,
 790                                       s->method->
 791                                       ssl3_enc->server_finished_label,
 792                                       s->method->
 793                                       ssl3_enc->server_finished_label_len);
 794             if (ret <= 0)
 795                 goto end;
 796             s->state = SSL3_ST_SW_FLUSH;
 797             if (s->hit) {
 798                 s->s3->tmp.next_state = SSL3_ST_SR_FINISHED_A;
 799
 800 #ifndef OPENSSL_NO_SCTP
 801                 /*
 802                  * Change to new shared key of SCTP-Auth, will be ignored if
 803                  * no SCTP used.
 804                  */
 805                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
 806                          0, NULL);
 807 #endif
 808             } else {
 809                 s->s3->tmp.next_state = SSL_ST_OK;
 810 #ifndef OPENSSL_NO_SCTP
 811                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 812                     s->d1->next_state = s->s3->tmp.next_state;
 813                     s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
 814                 }
 815 #endif
 816             }
 817             s->init_num = 0;
 818             break;
 819
 820         case SSL_ST_OK:
 821             /* clean a few things up */
 822             ssl3_cleanup_key_block(s);
 823
 824 #if 0
 825             BUF_MEM_free(s->init_buf);
 826             s->init_buf = NULL;
 827 #endif
 828
 829             /* remove buffering on output */
 830             ssl_free_wbio_buffer(s);
 831
 832             s->init_num = 0;
 833
 834             if (s->renegotiate == 2) { /* skipped if we just sent a
 835                                         * HelloRequest */
 836                 s->renegotiate = 0;
 837                 s->new_session = 0;
 838
 839                 ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
 840
 841                 s->ctx->stats.sess_accept_good++;
 842                 /* s->server=1; */
 843                 s->handshake_func = dtls1_accept;
 844
 845                 if (cb != NULL)
 846                     cb(s, SSL_CB_HANDSHAKE_DONE, 1);
 847             }
 848
 849             ret = 1;
 850
 851             /* done handshaking, next message is client hello */
 852             s->d1->handshake_read_seq = 0;
 853             /* next message is server hello */
 854             s->d1->handshake_write_seq = 0;
 855             s->d1->next_handshake_write_seq = 0;
 856             goto end;
 857             /* break; */
 858
 859         case SSL_ST_ERR:
 860         default:
 861             SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_UNKNOWN_STATE);
 862             ret = -1;
 863             goto end;
 864             /* break; */
 865         }
 866
 867         if (!s->s3->tmp.reuse_message && !skip) {
 868             if (s->debug) {
 869                 if ((ret = BIO_flush(s->wbio)) <= 0)
 870                     goto end;
 871             }
 872
 873             if ((cb != NULL) && (s->state != state)) {
 874                 new_state = s->state;
 875                 s->state = state;
 876                 cb(s, SSL_CB_ACCEPT_LOOP, 1);
 877                 s->state = new_state;
 878             }
 879         }
 880         skip = 0;
 881     }
 882  end:
 883     /* BIO_flush(s->wbio); */
 884
 885     s->in_handshake--;
 886 #ifndef OPENSSL_NO_SCTP
 887     /*
 888      * Notify SCTP BIO socket to leave handshake mode and prevent stream
 889      * identifier other than 0. Will be ignored if no SCTP is used.
 890      */
 891     BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
 892              s->in_handshake, NULL);
 893 #endif
 894
 895     if (cb != NULL)
 896         cb(s, SSL_CB_ACCEPT_EXIT, ret);
 897     return (ret);
 898 }
 899
 900 int dtls1_send_hello_request(SSL *s)
 901 {
 902     unsigned char *p;
 903
 904     if (s->state == SSL3_ST_SW_HELLO_REQ_A) {
 905         p = (unsigned char *)s->init_buf->data;
 906         p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 907
 908         s->state = SSL3_ST_SW_HELLO_REQ_B;
 909         /* number of bytes to write */
 910         s->init_num = DTLS1_HM_HEADER_LENGTH;
 911         s->init_off = 0;
 912
 913         /*
 914          * no need to buffer this message, since there are no retransmit
 915          * requests for it
 916          */
 917     }
 918
 919     /* SSL3_ST_SW_HELLO_REQ_B */
 920     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
 921 }
 922
 923 int dtls1_send_hello_verify_request(SSL *s)
 924 {
 925     unsigned int msg_len;
 926     unsigned char *msg, *buf, *p;
 927
 928     if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) {
 929         buf = (unsigned char *)s->init_buf->data;
 930
 931         msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 932         *(p++) = s->version >> 8;
 933         *(p++) = s->version & 0xFF;
 934
 935         if (s->ctx->app_gen_cookie_cb == NULL ||
 936             s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 937                                       &(s->d1->cookie_len)) == 0) {
 938             SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,
 939                    ERR_R_INTERNAL_ERROR);
 940             s->state = SSL_ST_ERR;
 941             return 0;
 942         }
 943
 944         *(p++) = (unsigned char)s->d1->cookie_len;
 945         memcpy(p, s->d1->cookie, s->d1->cookie_len);
 946         p += s->d1->cookie_len;
 947         msg_len = p - msg;
 948
 949         dtls1_set_message_header(s, buf,
 950                                  DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0,
 951                                  msg_len);
 952
 953         s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 954         /* number of bytes to write */
 955         s->init_num = p - buf;
 956         s->init_off = 0;
 957     }
 958
 959     /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 960     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
 961 }
 962
 963 int dtls1_send_server_hello(SSL *s)
 964 {
 965     unsigned char *buf;
 966     unsigned char *p, *d;
 967     int i;
 968     unsigned int sl;
 969     unsigned long l;
 970
 971     if (s->state == SSL3_ST_SW_SRVR_HELLO_A) {
 972         buf = (unsigned char *)s->init_buf->data;
 973         p = s->s3->server_random;
 974         ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE);
 975         /* Do the message type and length last */
 976         d = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 977
 978         *(p++) = s->version >> 8;
 979         *(p++) = s->version & 0xff;
 980
 981         /* Random stuff */
 982         memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE);
 983         p += SSL3_RANDOM_SIZE;
 984
 985         /*
 986          * now in theory we have 3 options to sending back the session id.
 987          * If it is a re-use, we send back the old session-id, if it is a new
 988          * session, we send back the new session-id or we send back a 0
 989          * length session-id if we want it to be single use. Currently I will
 990          * not implement the '0' length session-id 12-Jan-98 - I'll now
 991          * support the '0' length stuff.
 992          */
 993         if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 994             s->session->session_id_length = 0;
 995
 996         sl = s->session->session_id_length;
 997         if (sl > sizeof s->session->session_id) {
 998             SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 999             return -1;
1000         }
1001         *(p++) = sl;
1002         memcpy(p, s->session->session_id, sl);
1003         p += sl;
1004
1005         /* put the cipher */
1006         if (s->s3->tmp.new_cipher == NULL)
1007             return -1;
1008         i = ssl3_put_cipher_by_char(s->s3->tmp.new_cipher, p);
1009         p += i;
1010
1011         /* put the compression method */
1012 #ifdef OPENSSL_NO_COMP
1013         *(p++) = 0;
1014 #else
1015         if (s->s3->tmp.new_compression == NULL)
1016             *(p++) = 0;
1017         else
1018             *(p++) = s->s3->tmp.new_compression->id;
1019 #endif
1020
1021 #ifndef OPENSSL_NO_TLSEXT
1022         if (ssl_prepare_serverhello_tlsext(s) <= 0) {
1023             SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT);
1024             return -1;
1025         }
1026         if ((p =
1027              ssl_add_serverhello_tlsext(s, p,
1028                                         buf + SSL3_RT_MAX_PLAIN_LENGTH)) ==
1029             NULL) {
1030             SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1031             return -1;
1032         }
1033 #endif
1034
1035         /* do the header */
1036         l = (p - d);
1037         d = buf;
1038
1039         d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
1040
1041         s->state = SSL3_ST_SW_SRVR_HELLO_B;
1042         /* number of bytes to write */
1043         s->init_num = p - buf;
1044         s->init_off = 0;
1045
1046         /* buffer the message to handle re-xmits */
1047         dtls1_buffer_message(s, 0);
1048     }
1049
1050     /* SSL3_ST_SW_SRVR_HELLO_B */
1051     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1052 }
1053
1054 int dtls1_send_server_done(SSL *s)
1055 {
1056     unsigned char *p;
1057
1058     if (s->state == SSL3_ST_SW_SRVR_DONE_A) {
1059         p = (unsigned char *)s->init_buf->data;
1060
1061         /* do the header */
1062         p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
1063
1064         s->state = SSL3_ST_SW_SRVR_DONE_B;
1065         /* number of bytes to write */
1066         s->init_num = DTLS1_HM_HEADER_LENGTH;
1067         s->init_off = 0;
1068
1069         /* buffer the message to handle re-xmits */
1070         dtls1_buffer_message(s, 0);
1071     }
1072
1073     /* SSL3_ST_SW_SRVR_DONE_B */
1074     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1075 }
1076
1077 int dtls1_send_server_key_exchange(SSL *s)
1078 {
1079 #ifndef OPENSSL_NO_RSA
1080     unsigned char *q;
1081     int j, num;
1082     RSA *rsa;
1083     unsigned char md_buf[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
1084     unsigned int u;
1085 #endif
1086 #ifndef OPENSSL_NO_DH
1087     DH *dh = NULL, *dhp;
1088 #endif
1089 #ifndef OPENSSL_NO_ECDH
1090     EC_KEY *ecdh = NULL, *ecdhp;
1091     unsigned char *encodedPoint = NULL;
1092     int encodedlen = 0;
1093     int curve_id = 0;
1094     BN_CTX *bn_ctx = NULL;
1095 #endif
1096     EVP_PKEY *pkey;
1097     unsigned char *p, *d;
1098     int al, i;
1099     unsigned long type;
1100     int n;
1101     CERT *cert;
1102     BIGNUM *r[4];
1103     int nr[4], kn;
1104     BUF_MEM *buf;
1105     EVP_MD_CTX md_ctx;
1106
1107     EVP_MD_CTX_init(&md_ctx);
1108     if (s->state == SSL3_ST_SW_KEY_EXCH_A) {
1109         type = s->s3->tmp.new_cipher->algorithm_mkey;
1110         cert = s->cert;
1111
1112         buf = s->init_buf;
1113
1114         r[0] = r[1] = r[2] = r[3] = NULL;
1115         n = 0;
1116 #ifndef OPENSSL_NO_RSA
1117         if (type & SSL_kRSA) {
1118             rsa = cert->rsa_tmp;
1119             if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) {
1120                 rsa = s->cert->rsa_tmp_cb(s,
1121                                           SSL_C_IS_EXPORT(s->s3->
1122                                                           tmp.new_cipher),
1123                                           SSL_C_EXPORT_PKEYLENGTH(s->s3->
1124                                                                   tmp.new_cipher));
1125                 if (rsa == NULL) {
1126                     al = SSL_AD_HANDSHAKE_FAILURE;
1127                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1128                            SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1129                     goto f_err;
1130                 }
1131                 RSA_up_ref(rsa);
1132                 cert->rsa_tmp = rsa;
1133             }
1134             if (rsa == NULL) {
1135                 al = SSL_AD_HANDSHAKE_FAILURE;
1136                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1137                        SSL_R_MISSING_TMP_RSA_KEY);
1138                 goto f_err;
1139             }
1140             r[0] = rsa->n;
1141             r[1] = rsa->e;
1142             s->s3->tmp.use_rsa_tmp = 1;
1143         } else
1144 #endif
1145 #ifndef OPENSSL_NO_DH
1146         if (type & SSL_kEDH) {
1147             dhp = cert->dh_tmp;
1148             if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1149                 dhp = s->cert->dh_tmp_cb(s,
1150                                          SSL_C_IS_EXPORT(s->s3->
1151                                                          tmp.new_cipher),
1152                                          SSL_C_EXPORT_PKEYLENGTH(s->s3->
1153                                                                  tmp.new_cipher));
1154             if (dhp == NULL) {
1155                 al = SSL_AD_HANDSHAKE_FAILURE;
1156                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1157                        SSL_R_MISSING_TMP_DH_KEY);
1158                 goto f_err;
1159             }
1160
1161             if (s->s3->tmp.dh != NULL) {
1162                 DH_free(dh);
1163                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1164                        ERR_R_INTERNAL_ERROR);
1165                 goto err;
1166             }
1167
1168             if ((dh = DHparams_dup(dhp)) == NULL) {
1169                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB);
1170                 goto err;
1171             }
1172
1173             s->s3->tmp.dh = dh;
1174             if ((dhp->pub_key == NULL ||
1175                  dhp->priv_key == NULL ||
1176                  (s->options & SSL_OP_SINGLE_DH_USE))) {
1177                 if (!DH_generate_key(dh)) {
1178                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1179                            ERR_R_DH_LIB);
1180                     goto err;
1181                 }
1182             } else {
1183                 dh->pub_key = BN_dup(dhp->pub_key);
1184                 dh->priv_key = BN_dup(dhp->priv_key);
1185                 if ((dh->pub_key == NULL) || (dh->priv_key == NULL)) {
1186                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1187                            ERR_R_DH_LIB);
1188                     goto err;
1189                 }
1190             }
1191             r[0] = dh->p;
1192             r[1] = dh->g;
1193             r[2] = dh->pub_key;
1194         } else
1195 #endif
1196 #ifndef OPENSSL_NO_ECDH
1197         if (type & SSL_kEECDH) {
1198             const EC_GROUP *group;
1199
1200             ecdhp = cert->ecdh_tmp;
1201             if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL)) {
1202                 ecdhp = s->cert->ecdh_tmp_cb(s,
1203                                              SSL_C_IS_EXPORT(s->s3->
1204                                                              tmp.new_cipher),
1205                                              SSL_C_EXPORT_PKEYLENGTH(s->
1206                                                                      s3->tmp.new_cipher));
1207             }
1208             if (ecdhp == NULL) {
1209                 al = SSL_AD_HANDSHAKE_FAILURE;
1210                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1211                        SSL_R_MISSING_TMP_ECDH_KEY);
1212                 goto f_err;
1213             }
1214
1215             if (s->s3->tmp.ecdh != NULL) {
1216                 EC_KEY_free(s->s3->tmp.ecdh);
1217                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1218                        ERR_R_INTERNAL_ERROR);
1219                 goto err;
1220             }
1221
1222             /* Duplicate the ECDH structure. */
1223             if (ecdhp == NULL) {
1224                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1225                 goto err;
1226             }
1227             if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) {
1228                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1229                 goto err;
1230             }
1231
1232             s->s3->tmp.ecdh = ecdh;
1233             if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1234                 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1235                 (s->options & SSL_OP_SINGLE_ECDH_USE)) {
1236                 if (!EC_KEY_generate_key(ecdh)) {
1237                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1238                            ERR_R_ECDH_LIB);
1239                     goto err;
1240                 }
1241             }
1242
1243             if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1244                 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1245                 (EC_KEY_get0_private_key(ecdh) == NULL)) {
1246                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1247                 goto err;
1248             }
1249
1250             if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1251                 (EC_GROUP_get_degree(group) > 163)) {
1252                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1253                        SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1254                 goto err;
1255             }
1256
1257             /*
1258              * XXX: For now, we only support ephemeral ECDH keys over named
1259              * (not generic) curves. For supported named curves, curve_id is
1260              * non-zero.
1261              */
1262             if ((curve_id =
1263                  tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1264                 == 0) {
1265                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1266                        SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1267                 goto err;
1268             }
1269
1270             /*
1271              * Encode the public key. First check the size of encoding and
1272              * allocate memory accordingly.
1273              */
1274             encodedlen = EC_POINT_point2oct(group,
1275                                             EC_KEY_get0_public_key(ecdh),
1276                                             POINT_CONVERSION_UNCOMPRESSED,
1277                                             NULL, 0, NULL);
1278
1279             encodedPoint = (unsigned char *)
1280                 OPENSSL_malloc(encodedlen * sizeof(unsigned char));
1281             bn_ctx = BN_CTX_new();
1282             if ((encodedPoint == NULL) || (bn_ctx == NULL)) {
1283                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1284                        ERR_R_MALLOC_FAILURE);
1285                 goto err;
1286             }
1287
1288             encodedlen = EC_POINT_point2oct(group,
1289                                             EC_KEY_get0_public_key(ecdh),
1290                                             POINT_CONVERSION_UNCOMPRESSED,
1291                                             encodedPoint, encodedlen, bn_ctx);
1292
1293             if (encodedlen == 0) {
1294                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1295                 goto err;
1296             }
1297
1298             BN_CTX_free(bn_ctx);
1299             bn_ctx = NULL;
1300
1301             /*
1302              * XXX: For now, we only support named (not generic) curves in
1303              * ECDH ephemeral key exchanges. In this situation, we need four
1304              * additional bytes to encode the entire ServerECDHParams
1305              * structure.
1306              */
1307             n = 4 + encodedlen;
1308
1309             /*
1310              * We'll generate the serverKeyExchange message explicitly so we
1311              * can set these to NULLs
1312              */
1313             r[0] = NULL;
1314             r[1] = NULL;
1315             r[2] = NULL;
1316             r[3] = NULL;
1317         } else
1318 #endif                          /* !OPENSSL_NO_ECDH */
1319 #ifndef OPENSSL_NO_PSK
1320         if (type & SSL_kPSK) {
1321             /*
1322              * reserve size for record length and PSK identity hint
1323              */
1324             n += 2 + strlen(s->ctx->psk_identity_hint);
1325         } else
1326 #endif                          /* !OPENSSL_NO_PSK */
1327         {
1328             al = SSL_AD_HANDSHAKE_FAILURE;
1329             SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1330                    SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1331             goto f_err;
1332         }
1333         for (i = 0; r[i] != NULL; i++) {
1334             nr[i] = BN_num_bytes(r[i]);
1335             n += 2 + nr[i];
1336         }
1337
1338         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1339             && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
1340             if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, NULL))
1341                 == NULL) {
1342                 al = SSL_AD_DECODE_ERROR;
1343                 goto f_err;
1344             }
1345             kn = EVP_PKEY_size(pkey);
1346         } else {
1347             pkey = NULL;
1348             kn = 0;
1349         }
1350
1351         if (!BUF_MEM_grow_clean(buf, n + DTLS1_HM_HEADER_LENGTH + kn)) {
1352             SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_BUF);
1353             goto err;
1354         }
1355         d = (unsigned char *)s->init_buf->data;
1356         p = &(d[DTLS1_HM_HEADER_LENGTH]);
1357
1358         for (i = 0; r[i] != NULL; i++) {
1359             s2n(nr[i], p);
1360             BN_bn2bin(r[i], p);
1361             p += nr[i];
1362         }
1363
1364 #ifndef OPENSSL_NO_ECDH
1365         if (type & SSL_kEECDH) {
1366             /*
1367              * XXX: For now, we only support named (not generic) curves. In
1368              * this situation, the serverKeyExchange message has: [1 byte
1369              * CurveType], [2 byte CurveName] [1 byte length of encoded
1370              * point], followed by the actual encoded point itself
1371              */
1372             *p = NAMED_CURVE_TYPE;
1373             p += 1;
1374             *p = 0;
1375             p += 1;
1376             *p = curve_id;
1377             p += 1;
1378             *p = encodedlen;
1379             p += 1;
1380             memcpy((unsigned char *)p,
1381                    (unsigned char *)encodedPoint, encodedlen);
1382             OPENSSL_free(encodedPoint);
1383             encodedPoint = NULL;
1384             p += encodedlen;
1385         }
1386 #endif
1387
1388 #ifndef OPENSSL_NO_PSK
1389         if (type & SSL_kPSK) {
1390             /* copy PSK identity hint */
1391             s2n(strlen(s->ctx->psk_identity_hint), p);
1392             strncpy((char *)p, s->ctx->psk_identity_hint,
1393                     strlen(s->ctx->psk_identity_hint));
1394             p += strlen(s->ctx->psk_identity_hint);
1395         }
1396 #endif
1397
1398         /* not anonymous */
1399         if (pkey != NULL) {
1400             /*
1401              * n is the length of the params, they start at
1402              * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space at the
1403              * end.
1404              */
1405 #ifndef OPENSSL_NO_RSA
1406             if (pkey->type == EVP_PKEY_RSA) {
1407                 q = md_buf;
1408                 j = 0;
1409                 for (num = 2; num > 0; num--) {
1410                     EVP_DigestInit_ex(&md_ctx, (num == 2)
1411                                       ? s->ctx->md5 : s->ctx->sha1, NULL);
1412                     EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]),
1413                                      SSL3_RANDOM_SIZE);
1414                     EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]),
1415                                      SSL3_RANDOM_SIZE);
1416                     EVP_DigestUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]),
1417                                      n);
1418                     EVP_DigestFinal_ex(&md_ctx, q, (unsigned int *)&i);
1419                     q += i;
1420                     j += i;
1421                 }
1422                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1423                              &(p[2]), &u, pkey->pkey.rsa) <= 0) {
1424                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_RSA);
1425                     goto err;
1426                 }
1427                 s2n(u, p);
1428                 n += u + 2;
1429             } else
1430 #endif
1431 #if !defined(OPENSSL_NO_DSA)
1432             if (pkey->type == EVP_PKEY_DSA) {
1433                 /* lets do DSS */
1434                 EVP_SignInit_ex(&md_ctx, EVP_dss1(), NULL);
1435                 EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]),
1436                                SSL3_RANDOM_SIZE);
1437                 EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]),
1438                                SSL3_RANDOM_SIZE);
1439                 EVP_SignUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]), n);
1440                 if (!EVP_SignFinal(&md_ctx, &(p[2]),
1441                                    (unsigned int *)&i, pkey)) {
1442                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_DSA);
1443                     goto err;
1444                 }
1445                 s2n(i, p);
1446                 n += i + 2;
1447             } else
1448 #endif
1449 #if !defined(OPENSSL_NO_ECDSA)
1450             if (pkey->type == EVP_PKEY_EC) {
1451                 /* let's do ECDSA */
1452                 EVP_SignInit_ex(&md_ctx, EVP_ecdsa(), NULL);
1453                 EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]),
1454                                SSL3_RANDOM_SIZE);
1455                 EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]),
1456                                SSL3_RANDOM_SIZE);
1457                 EVP_SignUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]), n);
1458                 if (!EVP_SignFinal(&md_ctx, &(p[2]),
1459                                    (unsigned int *)&i, pkey)) {
1460                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1461                            ERR_LIB_ECDSA);
1462                     goto err;
1463                 }
1464                 s2n(i, p);
1465                 n += i + 2;
1466             } else
1467 #endif
1468             {
1469                 /* Is this error check actually needed? */
1470                 al = SSL_AD_HANDSHAKE_FAILURE;
1471                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1472                        SSL_R_UNKNOWN_PKEY_TYPE);
1473                 goto f_err;
1474             }
1475         }
1476
1477         d = dtls1_set_message_header(s, d,
1478                                      SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1479
1480         /*
1481          * we should now have things packed up, so lets send it off
1482          */
1483         s->init_num = n + DTLS1_HM_HEADER_LENGTH;
1484         s->init_off = 0;
1485
1486         /* buffer the message to handle re-xmits */
1487         dtls1_buffer_message(s, 0);
1488     }
1489
1490     s->state = SSL3_ST_SW_KEY_EXCH_B;
1491     EVP_MD_CTX_cleanup(&md_ctx);
1492     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1493  f_err:
1494     ssl3_send_alert(s, SSL3_AL_FATAL, al);
1495  err:
1496 #ifndef OPENSSL_NO_ECDH
1497     if (encodedPoint != NULL)
1498         OPENSSL_free(encodedPoint);
1499     BN_CTX_free(bn_ctx);
1500 #endif
1501     EVP_MD_CTX_cleanup(&md_ctx);
1502     return (-1);
1503 }
1504
1505 int dtls1_send_certificate_request(SSL *s)
1506 {
1507     unsigned char *p, *d;
1508     int i, j, nl, off, n;
1509     STACK_OF(X509_NAME) *sk = NULL;
1510     X509_NAME *name;
1511     BUF_MEM *buf;
1512     unsigned int msg_len;
1513
1514     if (s->state == SSL3_ST_SW_CERT_REQ_A) {
1515         buf = s->init_buf;
1516
1517         d = p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1518
1519         /* get the list of acceptable cert types */
1520         p++;
1521         n = ssl3_get_req_cert_type(s, p);
1522         d[0] = n;
1523         p += n;
1524         n++;
1525
1526         off = n;
1527         p += 2;
1528         n += 2;
1529
1530         sk = SSL_get_client_CA_list(s);
1531         nl = 0;
1532         if (sk != NULL) {
1533             for (i = 0; i < sk_X509_NAME_num(sk); i++) {
1534                 name = sk_X509_NAME_value(sk, i);
1535                 j = i2d_X509_NAME(name, NULL);
1536                 if (!BUF_MEM_grow_clean
1537                     (buf, DTLS1_HM_HEADER_LENGTH + n + j + 2)) {
1538                     SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,
1539                            ERR_R_BUF_LIB);
1540                     goto err;
1541                 }
1542                 p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH + n]);
1543                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) {
1544                     s2n(j, p);
1545                     i2d_X509_NAME(name, &p);
1546                     n += 2 + j;
1547                     nl += 2 + j;
1548                 } else {
1549                     d = p;
1550                     i2d_X509_NAME(name, &p);
1551                     j -= 2;
1552                     s2n(j, d);
1553                     j += 2;
1554                     n += j;
1555                     nl += j;
1556                 }
1557             }
1558         }
1559         /* else no CA names */
1560         p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH + off]);
1561         s2n(nl, p);
1562
1563         d = (unsigned char *)buf->data;
1564         *(d++) = SSL3_MT_CERTIFICATE_REQUEST;
1565         l2n3(n, d);
1566         s2n(s->d1->handshake_write_seq, d);
1567         s->d1->handshake_write_seq++;
1568
1569         /*
1570          * we should now have things packed up, so lets send it off
1571          */
1572
1573         s->init_num = n + DTLS1_HM_HEADER_LENGTH;
1574         s->init_off = 0;
1575 #ifdef NETSCAPE_HANG_BUG
1576 /* XXX: what to do about this? */
1577         p = (unsigned char *)s->init_buf->data + s->init_num;
1578
1579         /* do the header */
1580         *(p++) = SSL3_MT_SERVER_DONE;
1581         *(p++) = 0;
1582         *(p++) = 0;
1583         *(p++) = 0;
1584         s->init_num += 4;
1585 #endif
1586
1587         /* XDTLS:  set message header ? */
1588         msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1589         dtls1_set_message_header(s, (void *)s->init_buf->data,
1590                                  SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0,
1591                                  msg_len);
1592
1593         /* buffer the message to handle re-xmits */
1594         dtls1_buffer_message(s, 0);
1595
1596         s->state = SSL3_ST_SW_CERT_REQ_B;
1597     }
1598
1599     /* SSL3_ST_SW_CERT_REQ_B */
1600     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1601  err:
1602     return (-1);
1603 }
1604
1605 int dtls1_send_server_certificate(SSL *s)
1606 {
1607     unsigned long l;
1608     X509 *x;
1609
1610     if (s->state == SSL3_ST_SW_CERT_A) {
1611         x = ssl_get_server_send_cert(s);
1612         if (x == NULL) {
1613             /* VRS: allow null cert if auth == KRB5 */
1614             if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1615                 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5)) {
1616                 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,
1617                        ERR_R_INTERNAL_ERROR);
1618                 return (0);
1619             }
1620         }
1621
1622         l = dtls1_output_cert_chain(s, x);
1623         if (!l) {
1624             SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1625             return (0);
1626         }
1627         s->state = SSL3_ST_SW_CERT_B;
1628         s->init_num = (int)l;
1629         s->init_off = 0;
1630
1631         /* buffer the message to handle re-xmits */
1632         dtls1_buffer_message(s, 0);
1633     }
1634
1635     /* SSL3_ST_SW_CERT_B */
1636     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1637 }
1638
1639 #ifndef OPENSSL_NO_TLSEXT
1640 int dtls1_send_newsession_ticket(SSL *s)
1641 {
1642     if (s->state == SSL3_ST_SW_SESSION_TICKET_A) {
1643         unsigned char *p, *senc, *macstart;
1644         int len, slen;
1645         unsigned int hlen, msg_len;
1646         EVP_CIPHER_CTX ctx;
1647         HMAC_CTX hctx;
1648         SSL_CTX *tctx = s->initial_ctx;
1649         unsigned char iv[EVP_MAX_IV_LENGTH];
1650         unsigned char key_name[16];
1651
1652         /* get session encoding length */
1653         slen = i2d_SSL_SESSION(s->session, NULL);
1654         /*
1655          * Some length values are 16 bits, so forget it if session is too
1656          * long
1657          */
1658         if (slen > 0xFF00)
1659             return -1;
1660         /*
1661          * Grow buffer if need be: the length calculation is as follows 12
1662          * (DTLS handshake message header) + 4 (ticket lifetime hint) + 2
1663          * (ticket length) + 16 (key name) + max_iv_len (iv length) +
1664          * session_length + max_enc_block_size (max encrypted session length)
1665          * + max_md_size (HMAC).
1666          */
1667         if (!BUF_MEM_grow(s->init_buf,
1668                           DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1669                           EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1670             return -1;
1671         senc = OPENSSL_malloc(slen);
1672         if (!senc)
1673             return -1;
1674         p = senc;
1675         i2d_SSL_SESSION(s->session, &p);
1676
1677         p = (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1678         EVP_CIPHER_CTX_init(&ctx);
1679         HMAC_CTX_init(&hctx);
1680         /*
1681          * Initialize HMAC and cipher contexts. If callback present it does
1682          * all the work otherwise use generated values from parent ctx.
1683          */
1684         if (tctx->tlsext_ticket_key_cb) {
1685             if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1686                                            &hctx, 1) < 0) {
1687                 OPENSSL_free(senc);
1688                 return -1;
1689             }
1690         } else {
1691             RAND_pseudo_bytes(iv, 16);
1692             EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1693                                tctx->tlsext_tick_aes_key, iv);
1694             HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1695                          tlsext_tick_md(), NULL);
1696             memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1697         }
1698         l2n(s->session->tlsext_tick_lifetime_hint, p);
1699         /* Skip ticket length for now */
1700         p += 2;
1701         /* Output key name */
1702         macstart = p;
1703         memcpy(p, key_name, 16);
1704         p += 16;
1705         /* output IV */
1706         memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1707         p += EVP_CIPHER_CTX_iv_length(&ctx);
1708         /* Encrypt session data */
1709         EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1710         p += len;
1711         EVP_EncryptFinal(&ctx, p, &len);
1712         p += len;
1713         EVP_CIPHER_CTX_cleanup(&ctx);
1714
1715         HMAC_Update(&hctx, macstart, p - macstart);
1716         HMAC_Final(&hctx, p, &hlen);
1717         HMAC_CTX_cleanup(&hctx);
1718
1719         p += hlen;
1720         /* Now write out lengths: p points to end of data written */
1721         /* Total length */
1722         len = p - (unsigned char *)(s->init_buf->data);
1723         /* Ticket length */
1724         p = (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1725         s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1726
1727         /* number of bytes to write */
1728         s->init_num = len;
1729         s->state = SSL3_ST_SW_SESSION_TICKET_B;
1730         s->init_off = 0;
1731         OPENSSL_free(senc);
1732
1733         /* XDTLS:  set message header ? */
1734         msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1735         dtls1_set_message_header(s, (void *)s->init_buf->data,
1736                                  SSL3_MT_NEWSESSION_TICKET, msg_len, 0,
1737                                  msg_len);
1738
1739         /* buffer the message to handle re-xmits */
1740         dtls1_buffer_message(s, 0);
1741     }
1742
1743     /* SSL3_ST_SW_SESSION_TICKET_B */
1744     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1745 }
1746 #endif