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_clear_record_buffer(s);
 280                         dtls1_start_timer(s);
 281                         ret=dtls1_send_hello_request(s);
 282                         if (ret <= 0) goto end;
 283                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
 284                         s->state=SSL3_ST_SW_FLUSH;
 285                         s->init_num=0;
 286
 287                         ssl3_init_finished_mac(s);
 288                         break;
 289
 290                 case SSL3_ST_SW_HELLO_REQ_C:
 291                         s->state=SSL_ST_OK;
 292                         break;
 293
 294                 case SSL3_ST_SR_CLNT_HELLO_A:
 295                 case SSL3_ST_SR_CLNT_HELLO_B:
 296                 case SSL3_ST_SR_CLNT_HELLO_C:
 297
 298                         s->shutdown=0;
 299                         ret=ssl3_get_client_hello(s);
 300                         if (ret <= 0) goto end;
 301                         dtls1_stop_timer(s);
 302
 303                         if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
 304                                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
 305                         else
 306                                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
 307
 308                         s->init_num=0;
 309
 310                         /* Reflect ClientHello sequence to remain stateless while listening */
 311                         if (listen)
 312                                 {
 313                                 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence));
 314                                 }
 315
 316                         /* If we're just listening, stop here */
 317                         if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
 318                                 {
 319                                 ret = 2;
 320                                 s->d1->listen = 0;
 321                                 /* Set expected sequence numbers
 322                                  * to continue the handshake.
 323                                  */
 324                                 s->d1->handshake_read_seq = 2;
 325                                 s->d1->handshake_write_seq = 1;
 326                                 s->d1->next_handshake_write_seq = 1;
 327                                 goto end;
 328                                 }
 329
 330                         break;
 331
 332                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
 333                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
 334
 335                         ret = dtls1_send_hello_verify_request(s);
 336                         if ( ret <= 0) goto end;
 337                         s->state=SSL3_ST_SW_FLUSH;
 338                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
 339
 340                         /* HelloVerifyRequest resets Finished MAC */
 341                         if (s->version != DTLS1_BAD_VER)
 342                                 ssl3_init_finished_mac(s);
 343                         break;
 344
 345 #ifndef OPENSSL_NO_SCTP
 346                 case DTLS1_SCTP_ST_SR_READ_SOCK:
 347
 348                         if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
 349                                 {
 350                                 s->s3->in_read_app_data=2;
 351                                 s->rwstate=SSL_READING;
 352                                 BIO_clear_retry_flags(SSL_get_rbio(s));
 353                                 BIO_set_retry_read(SSL_get_rbio(s));
 354                                 ret = -1;
 355                                 goto end;
 356                                 }
 357
 358                         s->state=SSL3_ST_SR_FINISHED_A;
 359                         break;
 360
 361                 case DTLS1_SCTP_ST_SW_WRITE_SOCK:
 362                         ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
 363                         if (ret < 0) goto end;
 364
 365                         if (ret == 0)
 366                                 {
 367                                 if (s->d1->next_state != SSL_ST_OK)
 368                                         {
 369                                         s->s3->in_read_app_data=2;
 370                                         s->rwstate=SSL_READING;
 371                                         BIO_clear_retry_flags(SSL_get_rbio(s));
 372                                         BIO_set_retry_read(SSL_get_rbio(s));
 373                                         ret = -1;
 374                                         goto end;
 375                                         }
 376                                 }
 377
 378                         s->state=s->d1->next_state;
 379                         break;
 380 #endif
 381
 382                 case SSL3_ST_SW_SRVR_HELLO_A:
 383                 case SSL3_ST_SW_SRVR_HELLO_B:
 384                         s->renegotiate = 2;
 385                         dtls1_start_timer(s);
 386                         ret=dtls1_send_server_hello(s);
 387                         if (ret <= 0) goto end;
 388
 389                         if (s->hit)
 390                                 {
 391 #ifndef OPENSSL_NO_SCTP
 392                                 /* Add new shared key for SCTP-Auth,
 393                                  * will be ignored if no SCTP used.
 394                                  */
 395                                 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 396                                          DTLS1_SCTP_AUTH_LABEL);
 397
 398                                 SSL_export_keying_material(s, sctpauthkey,
 399                                                            sizeof(sctpauthkey), labelbuffer,
 400                                                            sizeof(labelbuffer), NULL, 0, 0);
 401
 402                                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 403                          sizeof(sctpauthkey), sctpauthkey);
 404 #endif
 405 #ifndef OPENSSL_NO_TLSEXT
 406                                 if (s->tlsext_ticket_expected)
 407                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 408                                 else
 409                                         s->state=SSL3_ST_SW_CHANGE_A;
 410 #else
 411                                 s->state=SSL3_ST_SW_CHANGE_A;
 412 #endif
 413                                 }
 414                         else
 415                                 s->state=SSL3_ST_SW_CERT_A;
 416                         s->init_num=0;
 417                         break;
 418
 419                 case SSL3_ST_SW_CERT_A:
 420                 case SSL3_ST_SW_CERT_B:
 421                         /* Check if it is anon DH or normal PSK */
 422                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
 423                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 424                                 {
 425                                 dtls1_start_timer(s);
 426                                 ret=dtls1_send_server_certificate(s);
 427                                 if (ret <= 0) goto end;
 428 #ifndef OPENSSL_NO_TLSEXT
 429                                 if (s->tlsext_status_expected)
 430                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 431                                 else
 432                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 433                                 }
 434                         else
 435                                 {
 436                                 skip = 1;
 437                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 438                                 }
 439 #else
 440                                 }
 441                         else
 442                                 skip=1;
 443
 444                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 445 #endif
 446                         s->init_num=0;
 447                         break;
 448
 449                 case SSL3_ST_SW_KEY_EXCH_A:
 450                 case SSL3_ST_SW_KEY_EXCH_B:
 451                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 452
 453                         /* clear this, it may get reset by
 454                          * send_server_key_exchange */
 455                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 456 #ifndef OPENSSL_NO_KRB5
 457                                 && !(alg_k & SSL_kKRB5)
 458 #endif /* OPENSSL_NO_KRB5 */
 459                                 )
 460                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 461                                  * even when forbidden by protocol specs
 462                                  * (handshake may fail as clients are not required to
 463                                  * be able to handle this) */
 464                                 s->s3->tmp.use_rsa_tmp=1;
 465                         else
 466                                 s->s3->tmp.use_rsa_tmp=0;
 467
 468                         /* only send if a DH key exchange or
 469                          * RSA but we have a sign only certificate */
 470                         if (s->s3->tmp.use_rsa_tmp
 471                         /* PSK: send ServerKeyExchange if PSK identity
 472                          * hint if provided */
 473 #ifndef OPENSSL_NO_PSK
 474                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 475 #endif
 476                             || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 477                             || (alg_k & SSL_kEECDH)
 478                             || ((alg_k & SSL_kRSA)
 479                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 480                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 481                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 482                                         )
 483                                     )
 484                                 )
 485                             )
 486                                 {
 487                                 dtls1_start_timer(s);
 488                                 ret=dtls1_send_server_key_exchange(s);
 489                                 if (ret <= 0) goto end;
 490                                 }
 491                         else
 492                                 skip=1;
 493
 494                         s->state=SSL3_ST_SW_CERT_REQ_A;
 495                         s->init_num=0;
 496                         break;
 497
 498                 case SSL3_ST_SW_CERT_REQ_A:
 499                 case SSL3_ST_SW_CERT_REQ_B:
 500                         if (/* don't request cert unless asked for it: */
 501                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 502                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 503                                  * don't request cert during re-negotiation: */
 504                                 ((s->session->peer != NULL) &&
 505                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 506                                 /* never request cert in anonymous ciphersuites
 507                                  * (see section "Certificate request" in SSL 3 drafts
 508                                  * and in RFC 2246): */
 509                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 510                                  /* ... except when the application insists on verification
 511                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 512                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 513                                  /* never request cert in Kerberos ciphersuites */
 514                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 515                                 /* With normal PSK Certificates and
 516                                  * Certificate Requests are omitted */
 517                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 518                                 {
 519                                 /* no cert request */
 520                                 skip=1;
 521                                 s->s3->tmp.cert_request=0;
 522                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 523 #ifndef OPENSSL_NO_SCTP
 524                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 525                                         {
 526                                         s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
 527                                         s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
 528                                         }
 529 #endif
 530                                 }
 531                         else
 532                                 {
 533                                 s->s3->tmp.cert_request=1;
 534                                 dtls1_start_timer(s);
 535                                 ret=dtls1_send_certificate_request(s);
 536                                 if (ret <= 0) goto end;
 537 #ifndef NETSCAPE_HANG_BUG
 538                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 539 #ifndef OPENSSL_NO_SCTP
 540                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 541                                         {
 542                                         s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
 543                                         s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
 544                                         }
 545 #endif
 546 #else
 547                                 s->state=SSL3_ST_SW_FLUSH;
 548                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 549 #ifndef OPENSSL_NO_SCTP
 550                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 551                                         {
 552                                         s->d1->next_state = s->s3->tmp.next_state;
 553                                         s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
 554                                         }
 555 #endif
 556 #endif
 557                                 s->init_num=0;
 558                                 }
 559                         break;
 560
 561                 case SSL3_ST_SW_SRVR_DONE_A:
 562                 case SSL3_ST_SW_SRVR_DONE_B:
 563                         dtls1_start_timer(s);
 564                         ret=dtls1_send_server_done(s);
 565                         if (ret <= 0) goto end;
 566                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 567                         s->state=SSL3_ST_SW_FLUSH;
 568                         s->init_num=0;
 569                         break;
 570
 571                 case SSL3_ST_SW_FLUSH:
 572                         s->rwstate=SSL_WRITING;
 573                         if (BIO_flush(s->wbio) <= 0)
 574                                 {
 575                                 /* If the write error was fatal, stop trying */
 576                                 if (!BIO_should_retry(s->wbio))
 577                                         {
 578                                         s->rwstate=SSL_NOTHING;
 579                                         s->state=s->s3->tmp.next_state;
 580                                         }
 581
 582                                 ret= -1;
 583                                 goto end;
 584                                 }
 585                         s->rwstate=SSL_NOTHING;
 586                         s->state=s->s3->tmp.next_state;
 587                         break;
 588
 589                 case SSL3_ST_SR_CERT_A:
 590                 case SSL3_ST_SR_CERT_B:
 591                         /* Check for second client hello (MS SGC) */
 592                         ret = ssl3_check_client_hello(s);
 593                         if (ret <= 0)
 594                                 goto end;
 595                         if (ret == 2)
 596                                 {
 597                                 dtls1_stop_timer(s);
 598                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 599                                 }
 600                         else {
 601                                 /* could be sent for a DH cert, even if we
 602                                  * have not asked for it :-) */
 603                                 ret=ssl3_get_client_certificate(s);
 604                                 if (ret <= 0) goto end;
 605                                 s->init_num=0;
 606                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 607                         }
 608                         break;
 609
 610                 case SSL3_ST_SR_KEY_EXCH_A:
 611                 case SSL3_ST_SR_KEY_EXCH_B:
 612                         ret=ssl3_get_client_key_exchange(s);
 613                         if (ret <= 0) goto end;
 614 #ifndef OPENSSL_NO_SCTP
 615                         /* Add new shared key for SCTP-Auth,
 616                          * will be ignored if no SCTP used.
 617                          */
 618                         snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 619                                  DTLS1_SCTP_AUTH_LABEL);
 620
 621                         SSL_export_keying_material(s, sctpauthkey,
 622                                                    sizeof(sctpauthkey), labelbuffer,
 623                                                    sizeof(labelbuffer), NULL, 0, 0);
 624
 625                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 626                                  sizeof(sctpauthkey), sctpauthkey);
 627 #endif
 628
 629                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 630                         s->init_num=0;
 631
 632                         if (ret == 2)
 633                                 {
 634                                 /* For the ECDH ciphersuites when
 635                                  * the client sends its ECDH pub key in
 636                                  * a certificate, the CertificateVerify
 637                                  * message is not sent.
 638                                  */
 639                                 s->state=SSL3_ST_SR_FINISHED_A;
 640                                 s->init_num = 0;
 641                                 }
 642                         else
 643                                 {
 644                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 645                                 s->init_num=0;
 646
 647                                 /* We need to get hashes here so if there is
 648                                  * a client cert, it can be verified */
 649                                 s->method->ssl3_enc->cert_verify_mac(s,
 650                                         NID_md5,
 651                                         &(s->s3->tmp.cert_verify_md[0]));
 652                                 s->method->ssl3_enc->cert_verify_mac(s,
 653                                         NID_sha1,
 654                                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 655                                 }
 656                         break;
 657
 658                 case SSL3_ST_SR_CERT_VRFY_A:
 659                 case SSL3_ST_SR_CERT_VRFY_B:
 660
 661                         s->d1->change_cipher_spec_ok = 1;
 662                         /* we should decide if we expected this one */
 663                         ret=ssl3_get_cert_verify(s);
 664                         if (ret <= 0) goto end;
 665 #ifndef OPENSSL_NO_SCTP
 666                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 667                             state == SSL_ST_RENEGOTIATE)
 668                                 s->state=DTLS1_SCTP_ST_SR_READ_SOCK;
 669                         else
 670 #endif
 671                                 s->state=SSL3_ST_SR_FINISHED_A;
 672                         s->init_num=0;
 673                         break;
 674
 675                 case SSL3_ST_SR_FINISHED_A:
 676                 case SSL3_ST_SR_FINISHED_B:
 677                         s->d1->change_cipher_spec_ok = 1;
 678                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 679                                 SSL3_ST_SR_FINISHED_B);
 680                         if (ret <= 0) goto end;
 681                         dtls1_stop_timer(s);
 682                         if (s->hit)
 683                                 s->state=SSL_ST_OK;
 684 #ifndef OPENSSL_NO_TLSEXT
 685                         else if (s->tlsext_ticket_expected)
 686                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 687 #endif
 688                         else
 689                                 s->state=SSL3_ST_SW_CHANGE_A;
 690                         s->init_num=0;
 691                         break;
 692
 693 #ifndef OPENSSL_NO_TLSEXT
 694                 case SSL3_ST_SW_SESSION_TICKET_A:
 695                 case SSL3_ST_SW_SESSION_TICKET_B:
 696                         ret=dtls1_send_newsession_ticket(s);
 697                         if (ret <= 0) goto end;
 698                         s->state=SSL3_ST_SW_CHANGE_A;
 699                         s->init_num=0;
 700                         break;
 701
 702                 case SSL3_ST_SW_CERT_STATUS_A:
 703                 case SSL3_ST_SW_CERT_STATUS_B:
 704                         ret=ssl3_send_cert_status(s);
 705                         if (ret <= 0) goto end;
 706                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 707                         s->init_num=0;
 708                         break;
 709
 710 #endif
 711
 712                 case SSL3_ST_SW_CHANGE_A:
 713                 case SSL3_ST_SW_CHANGE_B:
 714
 715                         s->session->cipher=s->s3->tmp.new_cipher;
 716                         if (!s->method->ssl3_enc->setup_key_block(s))
 717                                 { ret= -1; goto end; }
 718
 719                         ret=dtls1_send_change_cipher_spec(s,
 720                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 721
 722                         if (ret <= 0) goto end;
 723
 724 #ifndef OPENSSL_NO_SCTP
 725                         /* Change to new shared key of SCTP-Auth,
 726                          * will be ignored if no SCTP used.
 727                          */
 728                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
 729 #endif
 730
 731                         s->state=SSL3_ST_SW_FINISHED_A;
 732                         s->init_num=0;
 733
 734                         if (!s->method->ssl3_enc->change_cipher_state(s,
 735                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 736                                 {
 737                                 ret= -1;
 738                                 goto end;
 739                                 }
 740
 741                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 742                         break;
 743
 744                 case SSL3_ST_SW_FINISHED_A:
 745                 case SSL3_ST_SW_FINISHED_B:
 746                         ret=dtls1_send_finished(s,
 747                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 748                                 s->method->ssl3_enc->server_finished_label,
 749                                 s->method->ssl3_enc->server_finished_label_len);
 750                         if (ret <= 0) goto end;
 751                         s->state=SSL3_ST_SW_FLUSH;
 752                         if (s->hit)
 753                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 754                         else
 755                                 {
 756                                 s->s3->tmp.next_state=SSL_ST_OK;
 757 #ifndef OPENSSL_NO_SCTP
 758                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 759                                         {
 760                                         s->d1->next_state = s->s3->tmp.next_state;
 761                                         s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
 762                                         }
 763 #endif
 764                                 }
 765                         s->init_num=0;
 766                         break;
 767
 768                 case SSL_ST_OK:
 769                         /* clean a few things up */
 770                         ssl3_cleanup_key_block(s);
 771
 772 #if 0
 773                         BUF_MEM_free(s->init_buf);
 774                         s->init_buf=NULL;
 775 #endif
 776
 777                         /* remove buffering on output */
 778                         ssl_free_wbio_buffer(s);
 779
 780                         s->init_num=0;
 781
 782                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 783                                 {
 784                                 s->renegotiate=0;
 785                                 s->new_session=0;
 786
 787                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 788
 789                                 s->ctx->stats.sess_accept_good++;
 790                                 /* s->server=1; */
 791                                 s->handshake_func=dtls1_accept;
 792
 793                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 794                                 }
 795
 796                         ret = 1;
 797
 798                         /* done handshaking, next message is client hello */
 799                         s->d1->handshake_read_seq = 0;
 800                         /* next message is server hello */
 801                         s->d1->handshake_write_seq = 0;
 802                         s->d1->next_handshake_write_seq = 0;
 803                         goto end;
 804                         /* break; */
 805
 806                 default:
 807                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 808                         ret= -1;
 809                         goto end;
 810                         /* break; */
 811                         }
 812
 813                 if (!s->s3->tmp.reuse_message && !skip)
 814                         {
 815                         if (s->debug)
 816                                 {
 817                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 818                                         goto end;
 819                                 }
 820
 821
 822                         if ((cb != NULL) && (s->state != state))
 823                                 {
 824                                 new_state=s->state;
 825                                 s->state=state;
 826                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 827                                 s->state=new_state;
 828                                 }
 829                         }
 830                 skip=0;
 831                 }
 832 end:
 833         /* BIO_flush(s->wbio); */
 834
 835         s->in_handshake--;
 836 #ifndef OPENSSL_NO_SCTP
 837                 /* Notify SCTP BIO socket to leave handshake
 838                  * mode and prevent stream identifier other
 839                  * than 0. Will be ignored if no SCTP is used.
 840                  */
 841                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
 842 #endif
 843
 844         if (cb != NULL)
 845                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 846         return(ret);
 847         }
 848
 849 int dtls1_send_hello_request(SSL *s)
 850         {
 851         unsigned char *p;
 852
 853         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 854                 {
 855                 p=(unsigned char *)s->init_buf->data;
 856                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 857
 858                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 859                 /* number of bytes to write */
 860                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 861                 s->init_off=0;
 862
 863                 /* no need to buffer this message, since there are no retransmit
 864                  * requests for it */
 865                 }
 866
 867         /* SSL3_ST_SW_HELLO_REQ_B */
 868         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 869         }
 870
 871 int dtls1_send_hello_verify_request(SSL *s)
 872         {
 873         unsigned int msg_len;
 874         unsigned char *msg, *buf, *p;
 875
 876         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 877                 {
 878                 buf = (unsigned char *)s->init_buf->data;
 879
 880                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 881                 *(p++) = s->version >> 8;
 882                 *(p++) = s->version & 0xFF;
 883
 884                 if (s->ctx->app_gen_cookie_cb == NULL ||
 885                      s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 886                          &(s->d1->cookie_len)) == 0)
 887                         {
 888                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 889                         return 0;
 890                         }
 891
 892                 *(p++) = (unsigned char) s->d1->cookie_len;
 893                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 894                 p += s->d1->cookie_len;
 895                 msg_len = p - msg;
 896
 897                 dtls1_set_message_header(s, buf,
 898                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 899
 900                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 901                 /* number of bytes to write */
 902                 s->init_num=p-buf;
 903                 s->init_off=0;
 904                 }
 905
 906         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 907         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 908         }
 909
 910 int dtls1_send_server_hello(SSL *s)
 911         {
 912         unsigned char *buf;
 913         unsigned char *p,*d;
 914         int i;
 915         unsigned int sl;
 916         unsigned long l;
 917
 918         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 919                 {
 920                 buf=(unsigned char *)s->init_buf->data;
 921                 p=s->s3->server_random;
 922                 ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE);
 923                 /* Do the message type and length last */
 924                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 925
 926                 *(p++)=s->version>>8;
 927                 *(p++)=s->version&0xff;
 928
 929                 /* Random stuff */
 930                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 931                 p+=SSL3_RANDOM_SIZE;
 932
 933                 /* now in theory we have 3 options to sending back the
 934                  * session id.  If it is a re-use, we send back the
 935                  * old session-id, if it is a new session, we send
 936                  * back the new session-id or we send back a 0 length
 937                  * session-id if we want it to be single use.
 938                  * Currently I will not implement the '0' length session-id
 939                  * 12-Jan-98 - I'll now support the '0' length stuff.
 940                  */
 941                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 942                         s->session->session_id_length=0;
 943
 944                 sl=s->session->session_id_length;
 945                 if (sl > sizeof s->session->session_id)
 946                         {
 947                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 948                         return -1;
 949                         }
 950                 *(p++)=sl;
 951                 memcpy(p,s->session->session_id,sl);
 952                 p+=sl;
 953
 954                 /* put the cipher */
 955                 if (s->s3->tmp.new_cipher == NULL)
 956                         return -1;
 957                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 958                 p+=i;
 959
 960                 /* put the compression method */
 961 #ifdef OPENSSL_NO_COMP
 962                 *(p++)=0;
 963 #else
 964                 if (s->s3->tmp.new_compression == NULL)
 965                         *(p++)=0;
 966                 else
 967                         *(p++)=s->s3->tmp.new_compression->id;
 968 #endif
 969
 970 #ifndef OPENSSL_NO_TLSEXT
 971                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 972                         {
 973                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
 974                         return -1;
 975                         }
 976 #endif
 977
 978                 /* do the header */
 979                 l=(p-d);
 980                 d=buf;
 981
 982                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 983
 984                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
 985                 /* number of bytes to write */
 986                 s->init_num=p-buf;
 987                 s->init_off=0;
 988
 989                 /* buffer the message to handle re-xmits */
 990                 dtls1_buffer_message(s, 0);
 991                 }
 992
 993         /* SSL3_ST_SW_SRVR_HELLO_B */
 994         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 995         }
 996
 997 int dtls1_send_server_done(SSL *s)
 998         {
 999         unsigned char *p;
1000
1001         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1002                 {
1003                 p=(unsigned char *)s->init_buf->data;
1004
1005                 /* do the header */
1006                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
1007
1008                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1009                 /* number of bytes to write */
1010                 s->init_num=DTLS1_HM_HEADER_LENGTH;
1011                 s->init_off=0;
1012
1013                 /* buffer the message to handle re-xmits */
1014                 dtls1_buffer_message(s, 0);
1015                 }
1016
1017         /* SSL3_ST_SW_SRVR_DONE_B */
1018         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1019         }
1020
1021 int dtls1_send_server_key_exchange(SSL *s)
1022         {
1023 #ifndef OPENSSL_NO_RSA
1024         unsigned char *q;
1025         int j,num;
1026         RSA *rsa;
1027         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1028         unsigned int u;
1029 #endif
1030 #ifndef OPENSSL_NO_DH
1031         DH *dh=NULL,*dhp;
1032 #endif
1033 #ifndef OPENSSL_NO_ECDH
1034         EC_KEY *ecdh=NULL, *ecdhp;
1035         unsigned char *encodedPoint = NULL;
1036         int encodedlen = 0;
1037         int curve_id = 0;
1038         BN_CTX *bn_ctx = NULL;
1039 #endif
1040         EVP_PKEY *pkey;
1041         unsigned char *p,*d;
1042         int al,i;
1043         unsigned long type;
1044         int n;
1045         CERT *cert;
1046         BIGNUM *r[4];
1047         int nr[4],kn;
1048         BUF_MEM *buf;
1049         EVP_MD_CTX md_ctx;
1050
1051         EVP_MD_CTX_init(&md_ctx);
1052         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1053                 {
1054                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1055                 cert=s->cert;
1056
1057                 buf=s->init_buf;
1058
1059                 r[0]=r[1]=r[2]=r[3]=NULL;
1060                 n=0;
1061 #ifndef OPENSSL_NO_RSA
1062                 if (type & SSL_kRSA)
1063                         {
1064                         rsa=cert->rsa_tmp;
1065                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1066                                 {
1067                                 rsa=s->cert->rsa_tmp_cb(s,
1068                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1069                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1070                                 if(rsa == NULL)
1071                                 {
1072                                         al=SSL_AD_HANDSHAKE_FAILURE;
1073                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1074                                         goto f_err;
1075                                 }
1076                                 RSA_up_ref(rsa);
1077                                 cert->rsa_tmp=rsa;
1078                                 }
1079                         if (rsa == NULL)
1080                                 {
1081                                 al=SSL_AD_HANDSHAKE_FAILURE;
1082                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1083                                 goto f_err;
1084                                 }
1085                         r[0]=rsa->n;
1086                         r[1]=rsa->e;
1087                         s->s3->tmp.use_rsa_tmp=1;
1088                         }
1089                 else
1090 #endif
1091 #ifndef OPENSSL_NO_DH
1092                         if (type & SSL_kEDH)
1093                         {
1094                         dhp=cert->dh_tmp;
1095                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1096                                 dhp=s->cert->dh_tmp_cb(s,
1097                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1098                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1099                         if (dhp == NULL)
1100                                 {
1101                                 al=SSL_AD_HANDSHAKE_FAILURE;
1102                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1103                                 goto f_err;
1104                                 }
1105
1106                         if (s->s3->tmp.dh != NULL)
1107                                 {
1108                                 DH_free(dh);
1109                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1110                                 goto err;
1111                                 }
1112
1113                         if ((dh=DHparams_dup(dhp)) == NULL)
1114                                 {
1115                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1116                                 goto err;
1117                                 }
1118
1119                         s->s3->tmp.dh=dh;
1120                         if ((dhp->pub_key == NULL ||
1121                              dhp->priv_key == NULL ||
1122                              (s->options & SSL_OP_SINGLE_DH_USE)))
1123                                 {
1124                                 if(!DH_generate_key(dh))
1125                                     {
1126                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1127                                            ERR_R_DH_LIB);
1128                                     goto err;
1129                                     }
1130                                 }
1131                         else
1132                                 {
1133                                 dh->pub_key=BN_dup(dhp->pub_key);
1134                                 dh->priv_key=BN_dup(dhp->priv_key);
1135                                 if ((dh->pub_key == NULL) ||
1136                                         (dh->priv_key == NULL))
1137                                         {
1138                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1139                                         goto err;
1140                                         }
1141                                 }
1142                         r[0]=dh->p;
1143                         r[1]=dh->g;
1144                         r[2]=dh->pub_key;
1145                         }
1146                 else
1147 #endif
1148 #ifndef OPENSSL_NO_ECDH
1149                         if (type & SSL_kEECDH)
1150                         {
1151                         const EC_GROUP *group;
1152
1153                         ecdhp=cert->ecdh_tmp;
1154                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1155                                 {
1156                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1157                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1158                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1159                                 }
1160                         if (ecdhp == NULL)
1161                                 {
1162                                 al=SSL_AD_HANDSHAKE_FAILURE;
1163                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1164                                 goto f_err;
1165                                 }
1166
1167                         if (s->s3->tmp.ecdh != NULL)
1168                                 {
1169                                 EC_KEY_free(s->s3->tmp.ecdh);
1170                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1171                                 goto err;
1172                                 }
1173
1174                         /* Duplicate the ECDH structure. */
1175                         if (ecdhp == NULL)
1176                                 {
1177                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1178                                 goto err;
1179                                 }
1180                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1181                                 {
1182                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1183                                 goto err;
1184                                 }
1185
1186                         s->s3->tmp.ecdh=ecdh;
1187                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1188                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1189                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1190                                 {
1191                                 if(!EC_KEY_generate_key(ecdh))
1192                                     {
1193                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1194                                     goto err;
1195                                     }
1196                                 }
1197
1198                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1199                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1200                             (EC_KEY_get0_private_key(ecdh) == NULL))
1201                                 {
1202                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1203                                 goto err;
1204                                 }
1205
1206                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1207                             (EC_GROUP_get_degree(group) > 163))
1208                                 {
1209                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1210                                 goto err;
1211                                 }
1212
1213                         /* XXX: For now, we only support ephemeral ECDH
1214                          * keys over named (not generic) curves. For
1215                          * supported named curves, curve_id is non-zero.
1216                          */
1217                         if ((curve_id =
1218                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1219                             == 0)
1220                                 {
1221                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1222                                 goto err;
1223                                 }
1224
1225                         /* Encode the public key.
1226                          * First check the size of encoding and
1227                          * allocate memory accordingly.
1228                          */
1229                         encodedlen = EC_POINT_point2oct(group,
1230                             EC_KEY_get0_public_key(ecdh),
1231                             POINT_CONVERSION_UNCOMPRESSED,
1232                             NULL, 0, NULL);
1233
1234                         encodedPoint = (unsigned char *)
1235                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1236                         bn_ctx = BN_CTX_new();
1237                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1238                                 {
1239                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1240                                 goto err;
1241                                 }
1242
1243
1244                         encodedlen = EC_POINT_point2oct(group,
1245                             EC_KEY_get0_public_key(ecdh),
1246                             POINT_CONVERSION_UNCOMPRESSED,
1247                             encodedPoint, encodedlen, bn_ctx);
1248
1249                         if (encodedlen == 0)
1250                                 {
1251                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1252                                 goto err;
1253                                 }
1254
1255                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1256
1257                         /* XXX: For now, we only support named (not
1258                          * generic) curves in ECDH ephemeral key exchanges.
1259                          * In this situation, we need four additional bytes
1260                          * to encode the entire ServerECDHParams
1261                          * structure.
1262                          */
1263                         n = 4 + encodedlen;
1264
1265                         /* We'll generate the serverKeyExchange message
1266                          * explicitly so we can set these to NULLs
1267                          */
1268                         r[0]=NULL;
1269                         r[1]=NULL;
1270                         r[2]=NULL;
1271                         r[3]=NULL;
1272                         }
1273                 else
1274 #endif /* !OPENSSL_NO_ECDH */
1275 #ifndef OPENSSL_NO_PSK
1276                         if (type & SSL_kPSK)
1277                                 {
1278                                 /* reserve size for record length and PSK identity hint*/
1279                                 n+=2+strlen(s->ctx->psk_identity_hint);
1280                                 }
1281                         else
1282 #endif /* !OPENSSL_NO_PSK */
1283                         {
1284                         al=SSL_AD_HANDSHAKE_FAILURE;
1285                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1286                         goto f_err;
1287                         }
1288                 for (i=0; r[i] != NULL; i++)
1289                         {
1290                         nr[i]=BN_num_bytes(r[i]);
1291                         n+=2+nr[i];
1292                         }
1293
1294                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1295                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1296                         {
1297                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL))
1298                                 == NULL)
1299                                 {
1300                                 al=SSL_AD_DECODE_ERROR;
1301                                 goto f_err;
1302                                 }
1303                         kn=EVP_PKEY_size(pkey);
1304                         }
1305                 else
1306                         {
1307                         pkey=NULL;
1308                         kn=0;
1309                         }
1310
1311                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1312                         {
1313                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1314                         goto err;
1315                         }
1316                 d=(unsigned char *)s->init_buf->data;
1317                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1318
1319                 for (i=0; r[i] != NULL; i++)
1320                         {
1321                         s2n(nr[i],p);
1322                         BN_bn2bin(r[i],p);
1323                         p+=nr[i];
1324                         }
1325
1326 #ifndef OPENSSL_NO_ECDH
1327                 if (type & SSL_kEECDH)
1328                         {
1329                         /* XXX: For now, we only support named (not generic) curves.
1330                          * In this situation, the serverKeyExchange message has:
1331                          * [1 byte CurveType], [2 byte CurveName]
1332                          * [1 byte length of encoded point], followed by
1333                          * the actual encoded point itself
1334                          */
1335                         *p = NAMED_CURVE_TYPE;
1336                         p += 1;
1337                         *p = 0;
1338                         p += 1;
1339                         *p = curve_id;
1340                         p += 1;
1341                         *p = encodedlen;
1342                         p += 1;
1343                         memcpy((unsigned char*)p,
1344                             (unsigned char *)encodedPoint,
1345                             encodedlen);
1346                         OPENSSL_free(encodedPoint);
1347                         p += encodedlen;
1348                         }
1349 #endif
1350
1351 #ifndef OPENSSL_NO_PSK
1352                 if (type & SSL_kPSK)
1353                         {
1354                         /* copy PSK identity hint */
1355                         s2n(strlen(s->ctx->psk_identity_hint), p);
1356                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1357                         p+=strlen(s->ctx->psk_identity_hint);
1358                         }
1359 #endif
1360
1361                 /* not anonymous */
1362                 if (pkey != NULL)
1363                         {
1364                         /* n is the length of the params, they start at
1365                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1366                          * at the end. */
1367 #ifndef OPENSSL_NO_RSA
1368                         if (pkey->type == EVP_PKEY_RSA)
1369                                 {
1370                                 q=md_buf;
1371                                 j=0;
1372                                 for (num=2; num > 0; num--)
1373                                         {
1374                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1375                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1376                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1377                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1378                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1379                                         EVP_DigestFinal_ex(&md_ctx,q,
1380                                                 (unsigned int *)&i);
1381                                         q+=i;
1382                                         j+=i;
1383                                         }
1384                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1385                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1386                                         {
1387                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1388                                         goto err;
1389                                         }
1390                                 s2n(u,p);
1391                                 n+=u+2;
1392                                 }
1393                         else
1394 #endif
1395 #if !defined(OPENSSL_NO_DSA)
1396                                 if (pkey->type == EVP_PKEY_DSA)
1397                                 {
1398                                 /* lets do DSS */
1399                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1400                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1401                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1402                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1403                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1404                                         (unsigned int *)&i,pkey))
1405                                         {
1406                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1407                                         goto err;
1408                                         }
1409                                 s2n(i,p);
1410                                 n+=i+2;
1411                                 }
1412                         else
1413 #endif
1414 #if !defined(OPENSSL_NO_ECDSA)
1415                                 if (pkey->type == EVP_PKEY_EC)
1416                                 {
1417                                 /* let's do ECDSA */
1418                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1419                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1420                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1421                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1422                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1423                                         (unsigned int *)&i,pkey))
1424                                         {
1425                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1426                                         goto err;
1427                                         }
1428                                 s2n(i,p);
1429                                 n+=i+2;
1430                                 }
1431                         else
1432 #endif
1433                                 {
1434                                 /* Is this error check actually needed? */
1435                                 al=SSL_AD_HANDSHAKE_FAILURE;
1436                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1437                                 goto f_err;
1438                                 }
1439                         }
1440
1441                 d = dtls1_set_message_header(s, d,
1442                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1443
1444                 /* we should now have things packed up, so lets send
1445                  * it off */
1446                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1447                 s->init_off=0;
1448
1449                 /* buffer the message to handle re-xmits */
1450                 dtls1_buffer_message(s, 0);
1451                 }
1452
1453         s->state = SSL3_ST_SW_KEY_EXCH_B;
1454         EVP_MD_CTX_cleanup(&md_ctx);
1455         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1456 f_err:
1457         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1458 err:
1459 #ifndef OPENSSL_NO_ECDH
1460         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1461         BN_CTX_free(bn_ctx);
1462 #endif
1463         EVP_MD_CTX_cleanup(&md_ctx);
1464         return(-1);
1465         }
1466
1467 int dtls1_send_certificate_request(SSL *s)
1468         {
1469         unsigned char *p,*d;
1470         int i,j,nl,off,n;
1471         STACK_OF(X509_NAME) *sk=NULL;
1472         X509_NAME *name;
1473         BUF_MEM *buf;
1474         unsigned int msg_len;
1475
1476         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1477                 {
1478                 buf=s->init_buf;
1479
1480                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1481
1482                 /* get the list of acceptable cert types */
1483                 p++;
1484                 n=ssl3_get_req_cert_type(s,p);
1485                 d[0]=n;
1486                 p+=n;
1487                 n++;
1488
1489                 off=n;
1490                 p+=2;
1491                 n+=2;
1492
1493                 sk=SSL_get_client_CA_list(s);
1494                 nl=0;
1495                 if (sk != NULL)
1496                         {
1497                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1498                                 {
1499                                 name=sk_X509_NAME_value(sk,i);
1500                                 j=i2d_X509_NAME(name,NULL);
1501                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1502                                         {
1503                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1504                                         goto err;
1505                                         }
1506                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1507                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1508                                         {
1509                                         s2n(j,p);
1510                                         i2d_X509_NAME(name,&p);
1511                                         n+=2+j;
1512                                         nl+=2+j;
1513                                         }
1514                                 else
1515                                         {
1516                                         d=p;
1517                                         i2d_X509_NAME(name,&p);
1518                                         j-=2; s2n(j,d); j+=2;
1519                                         n+=j;
1520                                         nl+=j;
1521                                         }
1522                                 }
1523                         }
1524                 /* else no CA names */
1525                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1526                 s2n(nl,p);
1527
1528                 d=(unsigned char *)buf->data;
1529                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1530                 l2n3(n,d);
1531                 s2n(s->d1->handshake_write_seq,d);
1532                 s->d1->handshake_write_seq++;
1533
1534                 /* we should now have things packed up, so lets send
1535                  * it off */
1536
1537                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1538                 s->init_off=0;
1539 #ifdef NETSCAPE_HANG_BUG
1540 /* XXX: what to do about this? */
1541                 p=(unsigned char *)s->init_buf->data + s->init_num;
1542
1543                 /* do the header */
1544                 *(p++)=SSL3_MT_SERVER_DONE;
1545                 *(p++)=0;
1546                 *(p++)=0;
1547                 *(p++)=0;
1548                 s->init_num += 4;
1549 #endif
1550
1551                 /* XDTLS:  set message header ? */
1552                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1553                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1554                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1555
1556                 /* buffer the message to handle re-xmits */
1557                 dtls1_buffer_message(s, 0);
1558
1559                 s->state = SSL3_ST_SW_CERT_REQ_B;
1560                 }
1561
1562         /* SSL3_ST_SW_CERT_REQ_B */
1563         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1564 err:
1565         return(-1);
1566         }
1567
1568 int dtls1_send_server_certificate(SSL *s)
1569         {
1570         unsigned long l;
1571         X509 *x;
1572
1573         if (s->state == SSL3_ST_SW_CERT_A)
1574                 {
1575                 x=ssl_get_server_send_cert(s);
1576                 if (x == NULL)
1577                         {
1578                         /* VRS: allow null cert if auth == KRB5 */
1579                         if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1580                             (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1581                                 {
1582                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1583                                 return(0);
1584                                 }
1585                         }
1586
1587                 l=dtls1_output_cert_chain(s,x);
1588                 s->state=SSL3_ST_SW_CERT_B;
1589                 s->init_num=(int)l;
1590                 s->init_off=0;
1591
1592                 /* buffer the message to handle re-xmits */
1593                 dtls1_buffer_message(s, 0);
1594                 }
1595
1596         /* SSL3_ST_SW_CERT_B */
1597         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1598         }
1599
1600 #ifndef OPENSSL_NO_TLSEXT
1601 int dtls1_send_newsession_ticket(SSL *s)
1602         {
1603         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1604                 {
1605                 unsigned char *p, *senc, *macstart;
1606                 int len, slen;
1607                 unsigned int hlen, msg_len;
1608                 EVP_CIPHER_CTX ctx;
1609                 HMAC_CTX hctx;
1610                 SSL_CTX *tctx = s->initial_ctx;
1611                 unsigned char iv[EVP_MAX_IV_LENGTH];
1612                 unsigned char key_name[16];
1613
1614                 /* get session encoding length */
1615                 slen = i2d_SSL_SESSION(s->session, NULL);
1616                 /* Some length values are 16 bits, so forget it if session is
1617                  * too long
1618                  */
1619                 if (slen > 0xFF00)
1620                         return -1;
1621                 /* Grow buffer if need be: the length calculation is as
1622                  * follows 12 (DTLS handshake message header) +
1623                  * 4 (ticket lifetime hint) + 2 (ticket length) +
1624                  * 16 (key name) + max_iv_len (iv length) +
1625                  * session_length + max_enc_block_size (max encrypted session
1626                  * length) + max_md_size (HMAC).
1627                  */
1628                 if (!BUF_MEM_grow(s->init_buf,
1629                         DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1630                         EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1631                         return -1;
1632                 senc = OPENSSL_malloc(slen);
1633                 if (!senc)
1634                         return -1;
1635                 p = senc;
1636                 i2d_SSL_SESSION(s->session, &p);
1637
1638                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1639                 EVP_CIPHER_CTX_init(&ctx);
1640                 HMAC_CTX_init(&hctx);
1641                 /* Initialize HMAC and cipher contexts. If callback present
1642                  * it does all the work otherwise use generated values
1643                  * from parent ctx.
1644                  */
1645                 if (tctx->tlsext_ticket_key_cb)
1646                         {
1647                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1648                                                          &hctx, 1) < 0)
1649                                 {
1650                                 OPENSSL_free(senc);
1651                                 return -1;
1652                                 }
1653                         }
1654                 else
1655                         {
1656                         RAND_pseudo_bytes(iv, 16);
1657                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1658                                         tctx->tlsext_tick_aes_key, iv);
1659                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1660                                         tlsext_tick_md(), NULL);
1661                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1662                         }
1663                 l2n(s->session->tlsext_tick_lifetime_hint, p);
1664                 /* Skip ticket length for now */
1665                 p += 2;
1666                 /* Output key name */
1667                 macstart = p;
1668                 memcpy(p, key_name, 16);
1669                 p += 16;
1670                 /* output IV */
1671                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1672                 p += EVP_CIPHER_CTX_iv_length(&ctx);
1673                 /* Encrypt session data */
1674                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1675                 p += len;
1676                 EVP_EncryptFinal(&ctx, p, &len);
1677                 p += len;
1678                 EVP_CIPHER_CTX_cleanup(&ctx);
1679
1680                 HMAC_Update(&hctx, macstart, p - macstart);
1681                 HMAC_Final(&hctx, p, &hlen);
1682                 HMAC_CTX_cleanup(&hctx);
1683
1684                 p += hlen;
1685                 /* Now write out lengths: p points to end of data written */
1686                 /* Total length */
1687                 len = p - (unsigned char *)(s->init_buf->data);
1688                 /* Ticket length */
1689                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1690                 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1691
1692                 /* number of bytes to write */
1693                 s->init_num= len;
1694                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1695                 s->init_off=0;
1696                 OPENSSL_free(senc);
1697
1698                 /* XDTLS:  set message header ? */
1699                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1700                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1701                         SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1702
1703                 /* buffer the message to handle re-xmits */
1704                 dtls1_buffer_message(s, 0);
1705                 }
1706
1707         /* SSL3_ST_SW_SESSION_TICKET_B */
1708         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1709         }
1710 #endif