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