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,
 143                         dtls1_get_server_method)
 144
 145 int dtls1_accept(SSL *s)
 146         {
 147         BUF_MEM *buf;
 148         unsigned long Time=(unsigned long)time(NULL);
 149         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 150         unsigned long alg_k;
 151         int ret= -1;
 152         int new_state,state,skip=0;
 153         int listen;
 154 #ifndef OPENSSL_NO_SCTP
 155         unsigned char sctpauthkey[64];
 156         char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
 157 #endif
 158
 159         RAND_add(&Time,sizeof(Time),0);
 160         ERR_clear_error();
 161         clear_sys_error();
 162
 163         if (s->info_callback != NULL)
 164                 cb=s->info_callback;
 165         else if (s->ctx->info_callback != NULL)
 166                 cb=s->ctx->info_callback;
 167
 168         listen = s->d1->listen;
 169
 170         /* init things to blank */
 171         s->in_handshake++;
 172         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 173
 174         s->d1->listen = listen;
 175 #ifndef OPENSSL_NO_SCTP
 176         /* Notify SCTP BIO socket to enter handshake
 177          * mode and prevent stream identifier other
 178          * 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, s->in_handshake, NULL);
 181 #endif
 182
 183         if (s->cert == NULL)
 184                 {
 185                 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 186                 return(-1);
 187                 }
 188
 189 #ifndef OPENSSL_NO_HEARTBEATS
 190         /* If we're awaiting a HeartbeatResponse, pretend we
 191          * already got and don't await it anymore, because
 192          * Heartbeats don't make sense during handshakes anyway.
 193          */
 194         if (s->tlsext_hb_pending)
 195                 {
 196                 dtls1_stop_timer(s);
 197                 s->tlsext_hb_pending = 0;
 198                 s->tlsext_hb_seq++;
 199                 }
 200 #endif
 201
 202         for (;;)
 203                 {
 204                 state=s->state;
 205
 206                 switch (s->state)
 207                         {
 208                 case SSL_ST_RENEGOTIATE:
 209                         s->renegotiate=1;
 210                         /* s->state=SSL_ST_ACCEPT; */
 211
 212                 case SSL_ST_BEFORE:
 213                 case SSL_ST_ACCEPT:
 214                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 215                 case SSL_ST_OK|SSL_ST_ACCEPT:
 216
 217                         s->server=1;
 218                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 219
 220                         if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
 221                                 {
 222                                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
 223                                 return -1;
 224                                 }
 225                         s->type=SSL_ST_ACCEPT;
 226
 227                         if (s->init_buf == NULL)
 228                                 {
 229                                 if ((buf=BUF_MEM_new()) == NULL)
 230                                         {
 231                                         ret= -1;
 232                                         goto end;
 233                                         }
 234                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 235                                         {
 236                                         ret= -1;
 237                                         goto end;
 238                                         }
 239                                 s->init_buf=buf;
 240                                 }
 241
 242                         if (!ssl3_setup_buffers(s))
 243                                 {
 244                                 ret= -1;
 245                                 goto end;
 246                                 }
 247
 248                         s->init_num=0;
 249
 250                         if (s->state != SSL_ST_RENEGOTIATE)
 251                                 {
 252                                 /* Ok, we now need to push on a buffering BIO so that
 253                                  * the output is sent in a way that TCP likes :-)
 254                                  * ...but not with SCTP :-)
 255                                  */
 256 #ifndef OPENSSL_NO_SCTP
 257                                 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
 258 #endif
 259                                         if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 260
 261                                 ssl3_init_finished_mac(s);
 262                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 263                                 s->ctx->stats.sess_accept++;
 264                                 }
 265                         else
 266                                 {
 267                                 /* s->state == SSL_ST_RENEGOTIATE,
 268                                  * we will just send a HelloRequest */
 269                                 s->ctx->stats.sess_accept_renegotiate++;
 270                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 271                                 }
 272
 273                         break;
 274
 275                 case SSL3_ST_SW_HELLO_REQ_A:
 276                 case SSL3_ST_SW_HELLO_REQ_B:
 277
 278                         s->shutdown=0;
 279                         dtls1_start_timer(s);
 280                         ret=dtls1_send_hello_request(s);
 281                         if (ret <= 0) goto end;
 282                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 283                         s->state=SSL3_ST_SW_FLUSH;
 284                         s->init_num=0;
 285
 286                         ssl3_init_finished_mac(s);
 287                         break;
 288
 289                 case SSL3_ST_SW_HELLO_REQ_C:
 290                         s->state=SSL_ST_OK;
 291                         break;
 292
 293                 case SSL3_ST_SR_CLNT_HELLO_A:
 294                 case SSL3_ST_SR_CLNT_HELLO_B:
 295                 case SSL3_ST_SR_CLNT_HELLO_C:
 296
 297                         s->shutdown=0;
 298                         ret=ssl3_get_client_hello(s);
 299                         if (ret <= 0) goto end;
 300                         dtls1_stop_timer(s);
 301
 302                         if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
 303                                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
 304                         else
 305                                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
 306
 307                         s->init_num=0;
 308
 309                         /* Reflect ClientHello sequence to remain stateless while listening */
 310                         if (listen)
 311                                 {
 312                                 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence));
 313                                 }
 314
 315                         /* If we're just listening, stop here */
 316                         if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
 317                                 {
 318                                 ret = 2;
 319                                 s->d1->listen = 0;
 320                                 /* Set expected sequence numbers
 321                                  * to continue the handshake.
 322                                  */
 323                                 s->d1->handshake_read_seq = 2;
 324                                 s->d1->handshake_write_seq = 1;
 325                                 s->d1->next_handshake_write_seq = 1;
 326                                 goto end;
 327                                 }
 328
 329                         break;
 330
 331                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
 332                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
 333
 334                         ret = dtls1_send_hello_verify_request(s);
 335                         if ( ret <= 0) goto end;
 336                         s->state=SSL3_ST_SW_FLUSH;
 337                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
 338
 339                         /* HelloVerifyRequest resets Finished MAC */
 340                         if (s->version != DTLS1_BAD_VER)
 341                                 ssl3_init_finished_mac(s);
 342                         break;
 343
 344 #ifndef OPENSSL_NO_SCTP
 345                 case DTLS1_SCTP_ST_SR_READ_SOCK:
 346
 347                         if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
 348                                 {
 349                                 s->s3->in_read_app_data=2;
 350                                 s->rwstate=SSL_READING;
 351                                 BIO_clear_retry_flags(SSL_get_rbio(s));
 352                                 BIO_set_retry_read(SSL_get_rbio(s));
 353                                 ret = -1;
 354                                 goto end;
 355                                 }
 356
 357                         s->state=SSL3_ST_SR_FINISHED_A;
 358                         break;
 359
 360                 case DTLS1_SCTP_ST_SW_WRITE_SOCK:
 361                         ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
 362                         if (ret < 0) goto end;
 363
 364                         if (ret == 0)
 365                                 {
 366                                 if (s->d1->next_state != SSL_ST_OK)
 367                                         {
 368                                         s->s3->in_read_app_data=2;
 369                                         s->rwstate=SSL_READING;
 370                                         BIO_clear_retry_flags(SSL_get_rbio(s));
 371                                         BIO_set_retry_read(SSL_get_rbio(s));
 372                                         ret = -1;
 373                                         goto end;
 374                                         }
 375                                 }
 376
 377                         s->state=s->d1->next_state;
 378                         break;
 379 #endif
 380
 381                 case SSL3_ST_SW_SRVR_HELLO_A:
 382                 case SSL3_ST_SW_SRVR_HELLO_B:
 383                         s->renegotiate = 2;
 384                         dtls1_start_timer(s);
 385                         ret=dtls1_send_server_hello(s);
 386                         if (ret <= 0) goto end;
 387
 388                         if (s->hit)
 389                                 {
 390 #ifndef OPENSSL_NO_SCTP
 391                                 /* Add new shared key for SCTP-Auth,
 392                                  * will be ignored if no SCTP used.
 393                                  */
 394                                 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 395                                          DTLS1_SCTP_AUTH_LABEL);
 396
 397                                 SSL_export_keying_material(s, sctpauthkey,
 398                                                            sizeof(sctpauthkey), labelbuffer,
 399                                                            sizeof(labelbuffer), NULL, 0, 0);
 400
 401                                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 402                          sizeof(sctpauthkey), sctpauthkey);
 403 #endif
 404 #ifndef OPENSSL_NO_TLSEXT
 405                                 if (s->tlsext_ticket_expected)
 406                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 407                                 else
 408                                         s->state=SSL3_ST_SW_CHANGE_A;
 409 #else
 410                                 s->state=SSL3_ST_SW_CHANGE_A;
 411 #endif
 412                                 }
 413                         else
 414                                 s->state=SSL3_ST_SW_CERT_A;
 415                         s->init_num=0;
 416                         break;
 417
 418                 case SSL3_ST_SW_CERT_A:
 419                 case SSL3_ST_SW_CERT_B:
 420                         /* Check if it is anon DH or normal PSK */
 421                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
 422                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 423                                 {
 424                                 dtls1_start_timer(s);
 425                                 ret=dtls1_send_server_certificate(s);
 426                                 if (ret <= 0) goto end;
 427 #ifndef OPENSSL_NO_TLSEXT
 428                                 if (s->tlsext_status_expected)
 429                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 430                                 else
 431                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 432                                 }
 433                         else
 434                                 {
 435                                 skip = 1;
 436                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 437                                 }
 438 #else
 439                                 }
 440                         else
 441                                 skip=1;
 442
 443                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 444 #endif
 445                         s->init_num=0;
 446                         break;
 447
 448                 case SSL3_ST_SW_KEY_EXCH_A:
 449                 case SSL3_ST_SW_KEY_EXCH_B:
 450                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 451
 452                         /*
 453                          * clear this, it may get reset by
 454                          * send_server_key_exchange
 455                          */
 456                         s->s3->tmp.use_rsa_tmp=0;
 457
 458                         /* only send if a DH key exchange or
 459                          * RSA but we have a sign only certificate */
 460                         if (0
 461                         /* PSK: send ServerKeyExchange if PSK identity
 462                          * hint if provided */
 463 #ifndef OPENSSL_NO_PSK
 464                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 465 #endif
 466                             || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 467                             || (alg_k & SSL_kEECDH)
 468                             || ((alg_k & SSL_kRSA)
 469                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 470                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 471                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 472                                         )
 473                                     )
 474                                 )
 475                             )
 476                                 {
 477                                 dtls1_start_timer(s);
 478                                 ret=dtls1_send_server_key_exchange(s);
 479                                 if (ret <= 0) goto end;
 480                                 }
 481                         else
 482                                 skip=1;
 483
 484                         s->state=SSL3_ST_SW_CERT_REQ_A;
 485                         s->init_num=0;
 486                         break;
 487
 488                 case SSL3_ST_SW_CERT_REQ_A:
 489                 case SSL3_ST_SW_CERT_REQ_B:
 490                         if (/* don't request cert unless asked for it: */
 491                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 492                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 493                                  * don't request cert during re-negotiation: */
 494                                 ((s->session->peer != NULL) &&
 495                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 496                                 /* never request cert in anonymous ciphersuites
 497                                  * (see section "Certificate request" in SSL 3 drafts
 498                                  * and in RFC 2246): */
 499                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 500                                  /* ... except when the application insists on verification
 501                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 502                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 503                                  /* never request cert in Kerberos ciphersuites */
 504                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 505                                 /* With normal PSK Certificates and
 506                                  * Certificate Requests are omitted */
 507                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 508                                 {
 509                                 /* no cert request */
 510                                 skip=1;
 511                                 s->s3->tmp.cert_request=0;
 512                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 513 #ifndef OPENSSL_NO_SCTP
 514                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 515                                         {
 516                                         s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
 517                                         s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
 518                                         }
 519 #endif
 520                                 }
 521                         else
 522                                 {
 523                                 s->s3->tmp.cert_request=1;
 524                                 dtls1_start_timer(s);
 525                                 ret=dtls1_send_certificate_request(s);
 526                                 if (ret <= 0) goto end;
 527 #ifndef NETSCAPE_HANG_BUG
 528                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 529 #ifndef OPENSSL_NO_SCTP
 530                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 531                                         {
 532                                         s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
 533                                         s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
 534                                         }
 535 #endif
 536 #else
 537                                 s->state=SSL3_ST_SW_FLUSH;
 538                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 539 #ifndef OPENSSL_NO_SCTP
 540                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 541                                         {
 542                                         s->d1->next_state = s->s3->tmp.next_state;
 543                                         s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
 544                                         }
 545 #endif
 546 #endif
 547                                 s->init_num=0;
 548                                 }
 549                         break;
 550
 551                 case SSL3_ST_SW_SRVR_DONE_A:
 552                 case SSL3_ST_SW_SRVR_DONE_B:
 553                         dtls1_start_timer(s);
 554                         ret=dtls1_send_server_done(s);
 555                         if (ret <= 0) goto end;
 556                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 557                         s->state=SSL3_ST_SW_FLUSH;
 558                         s->init_num=0;
 559                         break;
 560
 561                 case SSL3_ST_SW_FLUSH:
 562                         s->rwstate=SSL_WRITING;
 563                         if (BIO_flush(s->wbio) <= 0)
 564                                 {
 565                                 /* If the write error was fatal, stop trying */
 566                                 if (!BIO_should_retry(s->wbio))
 567                                         {
 568                                         s->rwstate=SSL_NOTHING;
 569                                         s->state=s->s3->tmp.next_state;
 570                                         }
 571
 572                                 ret= -1;
 573                                 goto end;
 574                                 }
 575                         s->rwstate=SSL_NOTHING;
 576                         s->state=s->s3->tmp.next_state;
 577                         break;
 578
 579                 case SSL3_ST_SR_CERT_A:
 580                 case SSL3_ST_SR_CERT_B:
 581                         /* Check for second client hello (MS SGC) */
 582                         ret = ssl3_check_client_hello(s);
 583                         if (ret <= 0)
 584                                 goto end;
 585                         if (ret == 2)
 586                                 {
 587                                 dtls1_stop_timer(s);
 588                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 589                                 }
 590                         else {
 591                                 /* could be sent for a DH cert, even if we
 592                                  * have not asked for it :-) */
 593                                 ret=ssl3_get_client_certificate(s);
 594                                 if (ret <= 0) goto end;
 595                                 s->init_num=0;
 596                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 597                         }
 598                         break;
 599
 600                 case SSL3_ST_SR_KEY_EXCH_A:
 601                 case SSL3_ST_SR_KEY_EXCH_B:
 602                         ret=ssl3_get_client_key_exchange(s);
 603                         if (ret <= 0) goto end;
 604 #ifndef OPENSSL_NO_SCTP
 605                         /* Add new shared key for SCTP-Auth,
 606                          * will be ignored if no SCTP used.
 607                          */
 608                         snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 609                                  DTLS1_SCTP_AUTH_LABEL);
 610
 611                         SSL_export_keying_material(s, sctpauthkey,
 612                                                    sizeof(sctpauthkey), labelbuffer,
 613                                                    sizeof(labelbuffer), NULL, 0, 0);
 614
 615                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 616                                  sizeof(sctpauthkey), sctpauthkey);
 617 #endif
 618
 619                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 620                         s->init_num=0;
 621
 622                         if (ret == 2)
 623                                 {
 624                                 /* For the ECDH ciphersuites when
 625                                  * the client sends its ECDH pub key in
 626                                  * a certificate, the CertificateVerify
 627                                  * message is not sent.
 628                                  */
 629                                 s->state=SSL3_ST_SR_FINISHED_A;
 630                                 s->init_num = 0;
 631                                 }
 632                         else
 633                                 {
 634                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 635                                 s->init_num=0;
 636
 637                                 /* We need to get hashes here so if there is
 638                                  * a client cert, it can be verified */
 639                                 s->method->ssl3_enc->cert_verify_mac(s,
 640                                         NID_md5,
 641                                         &(s->s3->tmp.cert_verify_md[0]));
 642                                 s->method->ssl3_enc->cert_verify_mac(s,
 643                                         NID_sha1,
 644                                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 645                                 }
 646                         break;
 647
 648                 case SSL3_ST_SR_CERT_VRFY_A:
 649                 case SSL3_ST_SR_CERT_VRFY_B:
 650
 651                         s->d1->change_cipher_spec_ok = 1;
 652                         /* we should decide if we expected this one */
 653                         ret=ssl3_get_cert_verify(s);
 654                         if (ret <= 0) goto end;
 655 #ifndef OPENSSL_NO_SCTP
 656                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 657                             state == SSL_ST_RENEGOTIATE)
 658                                 s->state=DTLS1_SCTP_ST_SR_READ_SOCK;
 659                         else
 660 #endif
 661                                 s->state=SSL3_ST_SR_FINISHED_A;
 662                         s->init_num=0;
 663                         break;
 664
 665                 case SSL3_ST_SR_FINISHED_A:
 666                 case SSL3_ST_SR_FINISHED_B:
 667                         s->d1->change_cipher_spec_ok = 1;
 668                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 669                                 SSL3_ST_SR_FINISHED_B);
 670                         if (ret <= 0) goto end;
 671                         dtls1_stop_timer(s);
 672                         if (s->hit)
 673                                 s->state=SSL_ST_OK;
 674 #ifndef OPENSSL_NO_TLSEXT
 675                         else if (s->tlsext_ticket_expected)
 676                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 677 #endif
 678                         else
 679                                 s->state=SSL3_ST_SW_CHANGE_A;
 680                         s->init_num=0;
 681                         break;
 682
 683 #ifndef OPENSSL_NO_TLSEXT
 684                 case SSL3_ST_SW_SESSION_TICKET_A:
 685                 case SSL3_ST_SW_SESSION_TICKET_B:
 686                         ret=dtls1_send_newsession_ticket(s);
 687                         if (ret <= 0) goto end;
 688                         s->state=SSL3_ST_SW_CHANGE_A;
 689                         s->init_num=0;
 690                         break;
 691
 692                 case SSL3_ST_SW_CERT_STATUS_A:
 693                 case SSL3_ST_SW_CERT_STATUS_B:
 694                         ret=ssl3_send_cert_status(s);
 695                         if (ret <= 0) goto end;
 696                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 697                         s->init_num=0;
 698                         break;
 699
 700 #endif
 701
 702                 case SSL3_ST_SW_CHANGE_A:
 703                 case SSL3_ST_SW_CHANGE_B:
 704
 705                         s->session->cipher=s->s3->tmp.new_cipher;
 706                         if (!s->method->ssl3_enc->setup_key_block(s))
 707                                 { ret= -1; goto end; }
 708
 709                         ret=dtls1_send_change_cipher_spec(s,
 710                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 711
 712                         if (ret <= 0) goto end;
 713
 714 #ifndef OPENSSL_NO_SCTP
 715                         /* Change to new shared key of SCTP-Auth,
 716                          * will be ignored if no SCTP used.
 717                          */
 718                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
 719 #endif
 720
 721                         s->state=SSL3_ST_SW_FINISHED_A;
 722                         s->init_num=0;
 723
 724                         if (!s->method->ssl3_enc->change_cipher_state(s,
 725                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 726                                 {
 727                                 ret= -1;
 728                                 goto end;
 729                                 }
 730
 731                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 732                         break;
 733
 734                 case SSL3_ST_SW_FINISHED_A:
 735                 case SSL3_ST_SW_FINISHED_B:
 736                         ret=dtls1_send_finished(s,
 737                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 738                                 s->method->ssl3_enc->server_finished_label,
 739                                 s->method->ssl3_enc->server_finished_label_len);
 740                         if (ret <= 0) goto end;
 741                         s->state=SSL3_ST_SW_FLUSH;
 742                         if (s->hit)
 743                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 744                         else
 745                                 {
 746                                 s->s3->tmp.next_state=SSL_ST_OK;
 747 #ifndef OPENSSL_NO_SCTP
 748                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 749                                         {
 750                                         s->d1->next_state = s->s3->tmp.next_state;
 751                                         s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
 752                                         }
 753 #endif
 754                                 }
 755                         s->init_num=0;
 756                         break;
 757
 758                 case SSL_ST_OK:
 759                         /* clean a few things up */
 760                         ssl3_cleanup_key_block(s);
 761
 762 #if 0
 763                         BUF_MEM_free(s->init_buf);
 764                         s->init_buf=NULL;
 765 #endif
 766
 767                         /* remove buffering on output */
 768                         ssl_free_wbio_buffer(s);
 769
 770                         s->init_num=0;
 771
 772                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 773                                 {
 774                                 s->renegotiate=0;
 775                                 s->new_session=0;
 776
 777                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 778
 779                                 s->ctx->stats.sess_accept_good++;
 780                                 /* s->server=1; */
 781                                 s->handshake_func=dtls1_accept;
 782
 783                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 784                                 }
 785
 786                         ret = 1;
 787
 788                         /* done handshaking, next message is client hello */
 789                         s->d1->handshake_read_seq = 0;
 790                         /* next message is server hello */
 791                         s->d1->handshake_write_seq = 0;
 792                         s->d1->next_handshake_write_seq = 0;
 793                         goto end;
 794                         /* break; */
 795
 796                 default:
 797                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 798                         ret= -1;
 799                         goto end;
 800                         /* break; */
 801                         }
 802
 803                 if (!s->s3->tmp.reuse_message && !skip)
 804                         {
 805                         if (s->debug)
 806                                 {
 807                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 808                                         goto end;
 809                                 }
 810
 811
 812                         if ((cb != NULL) && (s->state != state))
 813                                 {
 814                                 new_state=s->state;
 815                                 s->state=state;
 816                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 817                                 s->state=new_state;
 818                                 }
 819                         }
 820                 skip=0;
 821                 }
 822 end:
 823         /* BIO_flush(s->wbio); */
 824
 825         s->in_handshake--;
 826 #ifndef OPENSSL_NO_SCTP
 827                 /* Notify SCTP BIO socket to leave handshake
 828                  * mode and prevent stream identifier other
 829                  * than 0. Will be ignored if no SCTP is used.
 830                  */
 831                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
 832 #endif
 833
 834         if (cb != NULL)
 835                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 836         return(ret);
 837         }
 838
 839 int dtls1_send_hello_request(SSL *s)
 840         {
 841         unsigned char *p;
 842
 843         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 844                 {
 845                 p=(unsigned char *)s->init_buf->data;
 846                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 847
 848                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 849                 /* number of bytes to write */
 850                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 851                 s->init_off=0;
 852
 853                 /* no need to buffer this message, since there are no retransmit
 854                  * requests for it */
 855                 }
 856
 857         /* SSL3_ST_SW_HELLO_REQ_B */
 858         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 859         }
 860
 861 int dtls1_send_hello_verify_request(SSL *s)
 862         {
 863         unsigned int msg_len;
 864         unsigned char *msg, *buf, *p;
 865
 866         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 867                 {
 868                 buf = (unsigned char *)s->init_buf->data;
 869
 870                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 871                 *(p++) = s->version >> 8;
 872                 *(p++) = s->version & 0xFF;
 873
 874                 if (s->ctx->app_gen_cookie_cb == NULL ||
 875                      s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 876                          &(s->d1->cookie_len)) == 0)
 877                         {
 878                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 879                         return 0;
 880                         }
 881
 882                 *(p++) = (unsigned char) s->d1->cookie_len;
 883                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 884                 p += s->d1->cookie_len;
 885                 msg_len = p - msg;
 886
 887                 dtls1_set_message_header(s, buf,
 888                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 889
 890                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 891                 /* number of bytes to write */
 892                 s->init_num=p-buf;
 893                 s->init_off=0;
 894                 }
 895
 896         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 897         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 898         }
 899
 900 int dtls1_send_server_hello(SSL *s)
 901         {
 902         unsigned char *buf;
 903         unsigned char *p,*d;
 904         int i;
 905         unsigned int sl;
 906         unsigned long l,Time;
 907
 908         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 909                 {
 910                 buf=(unsigned char *)s->init_buf->data;
 911                 p=s->s3->server_random;
 912                 Time=(unsigned long)time(NULL);                 /* Time */
 913                 l2n(Time,p);
 914                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4);
 915                 /* Do the message type and length last */
 916                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 917
 918                 *(p++)=s->version>>8;
 919                 *(p++)=s->version&0xff;
 920
 921                 /* Random stuff */
 922                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 923                 p+=SSL3_RANDOM_SIZE;
 924
 925                 /* now in theory we have 3 options to sending back the
 926                  * session id.  If it is a re-use, we send back the
 927                  * old session-id, if it is a new session, we send
 928                  * back the new session-id or we send back a 0 length
 929                  * session-id if we want it to be single use.
 930                  * Currently I will not implement the '0' length session-id
 931                  * 12-Jan-98 - I'll now support the '0' length stuff.
 932                  */
 933                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 934                         s->session->session_id_length=0;
 935
 936                 sl=s->session->session_id_length;
 937                 if (sl > sizeof s->session->session_id)
 938                         {
 939                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 940                         return -1;
 941                         }
 942                 *(p++)=sl;
 943                 memcpy(p,s->session->session_id,sl);
 944                 p+=sl;
 945
 946                 /* put the cipher */
 947                 if (s->s3->tmp.new_cipher == NULL)
 948                         return -1;
 949                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 950                 p+=i;
 951
 952                 /* put the compression method */
 953 #ifdef OPENSSL_NO_COMP
 954                 *(p++)=0;
 955 #else
 956                 if (s->s3->tmp.new_compression == NULL)
 957                         *(p++)=0;
 958                 else
 959                         *(p++)=s->s3->tmp.new_compression->id;
 960 #endif
 961
 962 #ifndef OPENSSL_NO_TLSEXT
 963                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 964                         {
 965                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
 966                         return -1;
 967                         }
 968 #endif
 969
 970                 /* do the header */
 971                 l=(p-d);
 972                 d=buf;
 973
 974                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 975
 976                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
 977                 /* number of bytes to write */
 978                 s->init_num=p-buf;
 979                 s->init_off=0;
 980
 981                 /* buffer the message to handle re-xmits */
 982                 dtls1_buffer_message(s, 0);
 983                 }
 984
 985         /* SSL3_ST_SW_SRVR_HELLO_B */
 986         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 987         }
 988
 989 int dtls1_send_server_done(SSL *s)
 990         {
 991         unsigned char *p;
 992
 993         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 994                 {
 995                 p=(unsigned char *)s->init_buf->data;
 996
 997                 /* do the header */
 998                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 999
1000                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1001                 /* number of bytes to write */
1002                 s->init_num=DTLS1_HM_HEADER_LENGTH;
1003                 s->init_off=0;
1004
1005                 /* buffer the message to handle re-xmits */
1006                 dtls1_buffer_message(s, 0);
1007                 }
1008
1009         /* SSL3_ST_SW_SRVR_DONE_B */
1010         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1011         }
1012
1013 int dtls1_send_server_key_exchange(SSL *s)
1014         {
1015 #ifndef OPENSSL_NO_RSA
1016         unsigned char *q;
1017         int j,num;
1018         RSA *rsa;
1019         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1020         unsigned int u;
1021 #endif
1022 #ifndef OPENSSL_NO_DH
1023         DH *dh=NULL,*dhp;
1024 #endif
1025 #ifndef OPENSSL_NO_ECDH
1026         EC_KEY *ecdh=NULL, *ecdhp;
1027         unsigned char *encodedPoint = NULL;
1028         int encodedlen = 0;
1029         int curve_id = 0;
1030         BN_CTX *bn_ctx = NULL;
1031 #endif
1032         EVP_PKEY *pkey;
1033         unsigned char *p,*d;
1034         int al,i;
1035         unsigned long type;
1036         int n;
1037         CERT *cert;
1038         BIGNUM *r[4];
1039         int nr[4],kn;
1040         BUF_MEM *buf;
1041         EVP_MD_CTX md_ctx;
1042
1043         EVP_MD_CTX_init(&md_ctx);
1044         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1045                 {
1046                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1047                 cert=s->cert;
1048
1049                 buf=s->init_buf;
1050
1051                 r[0]=r[1]=r[2]=r[3]=NULL;
1052                 n=0;
1053 #ifndef OPENSSL_NO_RSA
1054                 if (type & SSL_kRSA)
1055                         {
1056                         rsa=cert->rsa_tmp;
1057                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1058                                 {
1059                                 rsa=s->cert->rsa_tmp_cb(s,
1060                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1061                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1062                                 if(rsa == NULL)
1063                                 {
1064                                         al=SSL_AD_HANDSHAKE_FAILURE;
1065                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1066                                         goto f_err;
1067                                 }
1068                                 RSA_up_ref(rsa);
1069                                 cert->rsa_tmp=rsa;
1070                                 }
1071                         if (rsa == NULL)
1072                                 {
1073                                 al=SSL_AD_HANDSHAKE_FAILURE;
1074                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1075                                 goto f_err;
1076                                 }
1077                         r[0]=rsa->n;
1078                         r[1]=rsa->e;
1079                         s->s3->tmp.use_rsa_tmp=1;
1080                         }
1081                 else
1082 #endif
1083 #ifndef OPENSSL_NO_DH
1084                         if (type & SSL_kEDH)
1085                         {
1086                         dhp=cert->dh_tmp;
1087                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1088                                 dhp=s->cert->dh_tmp_cb(s,
1089                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1090                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1091                         if (dhp == NULL)
1092                                 {
1093                                 al=SSL_AD_HANDSHAKE_FAILURE;
1094                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1095                                 goto f_err;
1096                                 }
1097
1098                         if (s->s3->tmp.dh != NULL)
1099                                 {
1100                                 DH_free(dh);
1101                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1102                                 goto err;
1103                                 }
1104
1105                         if ((dh=DHparams_dup(dhp)) == NULL)
1106                                 {
1107                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1108                                 goto err;
1109                                 }
1110
1111                         s->s3->tmp.dh=dh;
1112                         if ((dhp->pub_key == NULL ||
1113                              dhp->priv_key == NULL ||
1114                              (s->options & SSL_OP_SINGLE_DH_USE)))
1115                                 {
1116                                 if(!DH_generate_key(dh))
1117                                     {
1118                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1119                                            ERR_R_DH_LIB);
1120                                     goto err;
1121                                     }
1122                                 }
1123                         else
1124                                 {
1125                                 dh->pub_key=BN_dup(dhp->pub_key);
1126                                 dh->priv_key=BN_dup(dhp->priv_key);
1127                                 if ((dh->pub_key == NULL) ||
1128                                         (dh->priv_key == NULL))
1129                                         {
1130                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1131                                         goto err;
1132                                         }
1133                                 }
1134                         r[0]=dh->p;
1135                         r[1]=dh->g;
1136                         r[2]=dh->pub_key;
1137                         }
1138                 else
1139 #endif
1140 #ifndef OPENSSL_NO_ECDH
1141                         if (type & SSL_kEECDH)
1142                         {
1143                         const EC_GROUP *group;
1144
1145                         ecdhp=cert->ecdh_tmp;
1146                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1147                                 {
1148                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1149                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1150                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1151                                 }
1152                         if (ecdhp == NULL)
1153                                 {
1154                                 al=SSL_AD_HANDSHAKE_FAILURE;
1155                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1156                                 goto f_err;
1157                                 }
1158
1159                         if (s->s3->tmp.ecdh != NULL)
1160                                 {
1161                                 EC_KEY_free(s->s3->tmp.ecdh);
1162                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1163                                 goto err;
1164                                 }
1165
1166                         /* Duplicate the ECDH structure. */
1167                         if (ecdhp == NULL)
1168                                 {
1169                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1170                                 goto err;
1171                                 }
1172                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1173                                 {
1174                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1175                                 goto err;
1176                                 }
1177
1178                         s->s3->tmp.ecdh=ecdh;
1179                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1180                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1181                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1182                                 {
1183                                 if(!EC_KEY_generate_key(ecdh))
1184                                     {
1185                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1186                                     goto err;
1187                                     }
1188                                 }
1189
1190                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1191                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1192                             (EC_KEY_get0_private_key(ecdh) == NULL))
1193                                 {
1194                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1195                                 goto err;
1196                                 }
1197
1198                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1199                             (EC_GROUP_get_degree(group) > 163))
1200                                 {
1201                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1202                                 goto err;
1203                                 }
1204
1205                         /* XXX: For now, we only support ephemeral ECDH
1206                          * keys over named (not generic) curves. For
1207                          * supported named curves, curve_id is non-zero.
1208                          */
1209                         if ((curve_id =
1210                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1211                             == 0)
1212                                 {
1213                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1214                                 goto err;
1215                                 }
1216
1217                         /* Encode the public key.
1218                          * First check the size of encoding and
1219                          * allocate memory accordingly.
1220                          */
1221                         encodedlen = EC_POINT_point2oct(group,
1222                             EC_KEY_get0_public_key(ecdh),
1223                             POINT_CONVERSION_UNCOMPRESSED,
1224                             NULL, 0, NULL);
1225
1226                         encodedPoint = (unsigned char *)
1227                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1228                         bn_ctx = BN_CTX_new();
1229                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1230                                 {
1231                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1232                                 goto err;
1233                                 }
1234
1235
1236                         encodedlen = EC_POINT_point2oct(group,
1237                             EC_KEY_get0_public_key(ecdh),
1238                             POINT_CONVERSION_UNCOMPRESSED,
1239                             encodedPoint, encodedlen, bn_ctx);
1240
1241                         if (encodedlen == 0)
1242                                 {
1243                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1244                                 goto err;
1245                                 }
1246
1247                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1248
1249                         /* XXX: For now, we only support named (not
1250                          * generic) curves in ECDH ephemeral key exchanges.
1251                          * In this situation, we need four additional bytes
1252                          * to encode the entire ServerECDHParams
1253                          * structure.
1254                          */
1255                         n = 4 + encodedlen;
1256
1257                         /* We'll generate the serverKeyExchange message
1258                          * explicitly so we can set these to NULLs
1259                          */
1260                         r[0]=NULL;
1261                         r[1]=NULL;
1262                         r[2]=NULL;
1263                         r[3]=NULL;
1264                         }
1265                 else
1266 #endif /* !OPENSSL_NO_ECDH */
1267 #ifndef OPENSSL_NO_PSK
1268                         if (type & SSL_kPSK)
1269                                 {
1270                                 /* reserve size for record length and PSK identity hint*/
1271                                 n+=2+strlen(s->ctx->psk_identity_hint);
1272                                 }
1273                         else
1274 #endif /* !OPENSSL_NO_PSK */
1275                         {
1276                         al=SSL_AD_HANDSHAKE_FAILURE;
1277                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1278                         goto f_err;
1279                         }
1280                 for (i=0; r[i] != NULL; i++)
1281                         {
1282                         nr[i]=BN_num_bytes(r[i]);
1283                         n+=2+nr[i];
1284                         }
1285
1286                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1287                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1288                         {
1289                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL))
1290                                 == NULL)
1291                                 {
1292                                 al=SSL_AD_DECODE_ERROR;
1293                                 goto f_err;
1294                                 }
1295                         kn=EVP_PKEY_size(pkey);
1296                         }
1297                 else
1298                         {
1299                         pkey=NULL;
1300                         kn=0;
1301                         }
1302
1303                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1304                         {
1305                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1306                         goto err;
1307                         }
1308                 d=(unsigned char *)s->init_buf->data;
1309                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1310
1311                 for (i=0; r[i] != NULL; i++)
1312                         {
1313                         s2n(nr[i],p);
1314                         BN_bn2bin(r[i],p);
1315                         p+=nr[i];
1316                         }
1317
1318 #ifndef OPENSSL_NO_ECDH
1319                 if (type & SSL_kEECDH)
1320                         {
1321                         /* XXX: For now, we only support named (not generic) curves.
1322                          * In this situation, the serverKeyExchange message has:
1323                          * [1 byte CurveType], [2 byte CurveName]
1324                          * [1 byte length of encoded point], followed by
1325                          * the actual encoded point itself
1326                          */
1327                         *p = NAMED_CURVE_TYPE;
1328                         p += 1;
1329                         *p = 0;
1330                         p += 1;
1331                         *p = curve_id;
1332                         p += 1;
1333                         *p = encodedlen;
1334                         p += 1;
1335                         memcpy((unsigned char*)p,
1336                             (unsigned char *)encodedPoint,
1337                             encodedlen);
1338                         OPENSSL_free(encodedPoint);
1339                         p += encodedlen;
1340                         }
1341 #endif
1342
1343 #ifndef OPENSSL_NO_PSK
1344                 if (type & SSL_kPSK)
1345                         {
1346                         /* copy PSK identity hint */
1347                         s2n(strlen(s->ctx->psk_identity_hint), p);
1348                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1349                         p+=strlen(s->ctx->psk_identity_hint);
1350                         }
1351 #endif
1352
1353                 /* not anonymous */
1354                 if (pkey != NULL)
1355                         {
1356                         /* n is the length of the params, they start at
1357                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1358                          * at the end. */
1359 #ifndef OPENSSL_NO_RSA
1360                         if (pkey->type == EVP_PKEY_RSA)
1361                                 {
1362                                 q=md_buf;
1363                                 j=0;
1364                                 for (num=2; num > 0; num--)
1365                                         {
1366                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1367                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1368                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1369                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1370                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1371                                         EVP_DigestFinal_ex(&md_ctx,q,
1372                                                 (unsigned int *)&i);
1373                                         q+=i;
1374                                         j+=i;
1375                                         }
1376                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1377                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1378                                         {
1379                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1380                                         goto err;
1381                                         }
1382                                 s2n(u,p);
1383                                 n+=u+2;
1384                                 }
1385                         else
1386 #endif
1387 #if !defined(OPENSSL_NO_DSA)
1388                                 if (pkey->type == EVP_PKEY_DSA)
1389                                 {
1390                                 /* lets do DSS */
1391                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1392                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1393                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1394                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1395                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1396                                         (unsigned int *)&i,pkey))
1397                                         {
1398                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1399                                         goto err;
1400                                         }
1401                                 s2n(i,p);
1402                                 n+=i+2;
1403                                 }
1404                         else
1405 #endif
1406 #if !defined(OPENSSL_NO_ECDSA)
1407                                 if (pkey->type == EVP_PKEY_EC)
1408                                 {
1409                                 /* let's do ECDSA */
1410                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1411                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1412                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1413                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1414                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1415                                         (unsigned int *)&i,pkey))
1416                                         {
1417                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1418                                         goto err;
1419                                         }
1420                                 s2n(i,p);
1421                                 n+=i+2;
1422                                 }
1423                         else
1424 #endif
1425                                 {
1426                                 /* Is this error check actually needed? */
1427                                 al=SSL_AD_HANDSHAKE_FAILURE;
1428                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1429                                 goto f_err;
1430                                 }
1431                         }
1432
1433                 d = dtls1_set_message_header(s, d,
1434                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1435
1436                 /* we should now have things packed up, so lets send
1437                  * it off */
1438                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1439                 s->init_off=0;
1440
1441                 /* buffer the message to handle re-xmits */
1442                 dtls1_buffer_message(s, 0);
1443                 }
1444
1445         s->state = SSL3_ST_SW_KEY_EXCH_B;
1446         EVP_MD_CTX_cleanup(&md_ctx);
1447         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1448 f_err:
1449         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1450 err:
1451 #ifndef OPENSSL_NO_ECDH
1452         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1453         BN_CTX_free(bn_ctx);
1454 #endif
1455         EVP_MD_CTX_cleanup(&md_ctx);
1456         return(-1);
1457         }
1458
1459 int dtls1_send_certificate_request(SSL *s)
1460         {
1461         unsigned char *p,*d;
1462         int i,j,nl,off,n;
1463         STACK_OF(X509_NAME) *sk=NULL;
1464         X509_NAME *name;
1465         BUF_MEM *buf;
1466         unsigned int msg_len;
1467
1468         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1469                 {
1470                 buf=s->init_buf;
1471
1472                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1473
1474                 /* get the list of acceptable cert types */
1475                 p++;
1476                 n=ssl3_get_req_cert_type(s,p);
1477                 d[0]=n;
1478                 p+=n;
1479                 n++;
1480
1481                 off=n;
1482                 p+=2;
1483                 n+=2;
1484
1485                 sk=SSL_get_client_CA_list(s);
1486                 nl=0;
1487                 if (sk != NULL)
1488                         {
1489                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1490                                 {
1491                                 name=sk_X509_NAME_value(sk,i);
1492                                 j=i2d_X509_NAME(name,NULL);
1493                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1494                                         {
1495                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1496                                         goto err;
1497                                         }
1498                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1499                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1500                                         {
1501                                         s2n(j,p);
1502                                         i2d_X509_NAME(name,&p);
1503                                         n+=2+j;
1504                                         nl+=2+j;
1505                                         }
1506                                 else
1507                                         {
1508                                         d=p;
1509                                         i2d_X509_NAME(name,&p);
1510                                         j-=2; s2n(j,d); j+=2;
1511                                         n+=j;
1512                                         nl+=j;
1513                                         }
1514                                 }
1515                         }
1516                 /* else no CA names */
1517                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1518                 s2n(nl,p);
1519
1520                 d=(unsigned char *)buf->data;
1521                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1522                 l2n3(n,d);
1523                 s2n(s->d1->handshake_write_seq,d);
1524                 s->d1->handshake_write_seq++;
1525
1526                 /* we should now have things packed up, so lets send
1527                  * it off */
1528
1529                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1530                 s->init_off=0;
1531 #ifdef NETSCAPE_HANG_BUG
1532 /* XXX: what to do about this? */
1533                 p=(unsigned char *)s->init_buf->data + s->init_num;
1534
1535                 /* do the header */
1536                 *(p++)=SSL3_MT_SERVER_DONE;
1537                 *(p++)=0;
1538                 *(p++)=0;
1539                 *(p++)=0;
1540                 s->init_num += 4;
1541 #endif
1542
1543                 /* XDTLS:  set message header ? */
1544                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1545                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1546                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1547
1548                 /* buffer the message to handle re-xmits */
1549                 dtls1_buffer_message(s, 0);
1550
1551                 s->state = SSL3_ST_SW_CERT_REQ_B;
1552                 }
1553
1554         /* SSL3_ST_SW_CERT_REQ_B */
1555         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1556 err:
1557         return(-1);
1558         }
1559
1560 int dtls1_send_server_certificate(SSL *s)
1561         {
1562         unsigned long l;
1563         X509 *x;
1564
1565         if (s->state == SSL3_ST_SW_CERT_A)
1566                 {
1567                 x=ssl_get_server_send_cert(s);
1568                 if (x == NULL)
1569                         {
1570                         /* VRS: allow null cert if auth == KRB5 */
1571                         if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1572                             (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1573                                 {
1574                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1575                                 return(0);
1576                                 }
1577                         }
1578
1579                 l=dtls1_output_cert_chain(s,x);
1580                 s->state=SSL3_ST_SW_CERT_B;
1581                 s->init_num=(int)l;
1582                 s->init_off=0;
1583
1584                 /* buffer the message to handle re-xmits */
1585                 dtls1_buffer_message(s, 0);
1586                 }
1587
1588         /* SSL3_ST_SW_CERT_B */
1589         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1590         }
1591
1592 #ifndef OPENSSL_NO_TLSEXT
1593 int dtls1_send_newsession_ticket(SSL *s)
1594         {
1595         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1596                 {
1597                 unsigned char *p, *senc, *macstart;
1598                 int len, slen;
1599                 unsigned int hlen, msg_len;
1600                 EVP_CIPHER_CTX ctx;
1601                 HMAC_CTX hctx;
1602                 SSL_CTX *tctx = s->initial_ctx;
1603                 unsigned char iv[EVP_MAX_IV_LENGTH];
1604                 unsigned char key_name[16];
1605
1606                 /* get session encoding length */
1607                 slen = i2d_SSL_SESSION(s->session, NULL);
1608                 /* Some length values are 16 bits, so forget it if session is
1609                  * too long
1610                  */
1611                 if (slen > 0xFF00)
1612                         return -1;
1613                 /* Grow buffer if need be: the length calculation is as
1614                  * follows 12 (DTLS handshake message header) +
1615                  * 4 (ticket lifetime hint) + 2 (ticket length) +
1616                  * 16 (key name) + max_iv_len (iv length) +
1617                  * session_length + max_enc_block_size (max encrypted session
1618                  * length) + max_md_size (HMAC).
1619                  */
1620                 if (!BUF_MEM_grow(s->init_buf,
1621                         DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1622                         EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1623                         return -1;
1624                 senc = OPENSSL_malloc(slen);
1625                 if (!senc)
1626                         return -1;
1627                 p = senc;
1628                 i2d_SSL_SESSION(s->session, &p);
1629
1630                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1631                 EVP_CIPHER_CTX_init(&ctx);
1632                 HMAC_CTX_init(&hctx);
1633                 /* Initialize HMAC and cipher contexts. If callback present
1634                  * it does all the work otherwise use generated values
1635                  * from parent ctx.
1636                  */
1637                 if (tctx->tlsext_ticket_key_cb)
1638                         {
1639                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1640                                                          &hctx, 1) < 0)
1641                                 {
1642                                 OPENSSL_free(senc);
1643                                 return -1;
1644                                 }
1645                         }
1646                 else
1647                         {
1648                         RAND_pseudo_bytes(iv, 16);
1649                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1650                                         tctx->tlsext_tick_aes_key, iv);
1651                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1652                                         tlsext_tick_md(), NULL);
1653                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1654                         }
1655                 l2n(s->session->tlsext_tick_lifetime_hint, p);
1656                 /* Skip ticket length for now */
1657                 p += 2;
1658                 /* Output key name */
1659                 macstart = p;
1660                 memcpy(p, key_name, 16);
1661                 p += 16;
1662                 /* output IV */
1663                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1664                 p += EVP_CIPHER_CTX_iv_length(&ctx);
1665                 /* Encrypt session data */
1666                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1667                 p += len;
1668                 EVP_EncryptFinal(&ctx, p, &len);
1669                 p += len;
1670                 EVP_CIPHER_CTX_cleanup(&ctx);
1671
1672                 HMAC_Update(&hctx, macstart, p - macstart);
1673                 HMAC_Final(&hctx, p, &hlen);
1674                 HMAC_CTX_cleanup(&hctx);
1675
1676                 p += hlen;
1677                 /* Now write out lengths: p points to end of data written */
1678                 /* Total length */
1679                 len = p - (unsigned char *)(s->init_buf->data);
1680                 /* Ticket length */
1681                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1682                 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1683
1684                 /* number of bytes to write */
1685                 s->init_num= len;
1686                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1687                 s->init_off=0;
1688                 OPENSSL_free(senc);
1689
1690                 /* XDTLS:  set message header ? */
1691                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1692                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1693                         SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1694
1695                 /* buffer the message to handle re-xmits */
1696                 dtls1_buffer_message(s, 0);
1697                 }
1698
1699         /* SSL3_ST_SW_SESSION_TICKET_B */
1700         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1701         }
1702 #endif