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