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                         /* clear this, it may get reset by
 458                          * send_server_key_exchange */
 459                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 460 #ifndef OPENSSL_NO_KRB5
 461                                 && !(alg_k & SSL_kKRB5)
 462 #endif /* OPENSSL_NO_KRB5 */
 463                                 )
 464                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 465                                  * even when forbidden by protocol specs
 466                                  * (handshake may fail as clients are not required to
 467                                  * be able to handle this) */
 468                                 s->s3->tmp.use_rsa_tmp=1;
 469                         else
 470                                 s->s3->tmp.use_rsa_tmp=0;
 471
 472                         /* only send if a DH key exchange or
 473                          * RSA but we have a sign only certificate */
 474                         if (s->s3->tmp.use_rsa_tmp
 475                         /* PSK: send ServerKeyExchange if PSK identity
 476                          * hint if provided */
 477 #ifndef OPENSSL_NO_PSK
 478                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 479 #endif
 480                             || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 481                             || (alg_k & SSL_kEECDH)
 482                             || ((alg_k & SSL_kRSA)
 483                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 484                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 485                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 486                                         )
 487                                     )
 488                                 )
 489                             )
 490                                 {
 491                                 dtls1_start_timer(s);
 492                                 ret=dtls1_send_server_key_exchange(s);
 493                                 if (ret <= 0) goto end;
 494                                 }
 495                         else
 496                                 skip=1;
 497
 498                         s->state=SSL3_ST_SW_CERT_REQ_A;
 499                         s->init_num=0;
 500                         break;
 501
 502                 case SSL3_ST_SW_CERT_REQ_A:
 503                 case SSL3_ST_SW_CERT_REQ_B:
 504                         if (/* don't request cert unless asked for it: */
 505                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 506                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 507                                  * don't request cert during re-negotiation: */
 508                                 ((s->session->peer != NULL) &&
 509                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 510                                 /* never request cert in anonymous ciphersuites
 511                                  * (see section "Certificate request" in SSL 3 drafts
 512                                  * and in RFC 2246): */
 513                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 514                                  /* ... except when the application insists on verification
 515                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 516                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 517                                  /* never request cert in Kerberos ciphersuites */
 518                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 519                                 /* With normal PSK Certificates and
 520                                  * Certificate Requests are omitted */
 521                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 522                                 {
 523                                 /* no cert request */
 524                                 skip=1;
 525                                 s->s3->tmp.cert_request=0;
 526                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 527 #ifndef OPENSSL_NO_SCTP
 528                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 529                                         {
 530                                         s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
 531                                         s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
 532                                         }
 533 #endif
 534                                 }
 535                         else
 536                                 {
 537                                 s->s3->tmp.cert_request=1;
 538                                 dtls1_start_timer(s);
 539                                 ret=dtls1_send_certificate_request(s);
 540                                 if (ret <= 0) goto end;
 541 #ifndef NETSCAPE_HANG_BUG
 542                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 543 #ifndef OPENSSL_NO_SCTP
 544                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 545                                         {
 546                                         s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
 547                                         s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
 548                                         }
 549 #endif
 550 #else
 551                                 s->state=SSL3_ST_SW_FLUSH;
 552                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 553 #ifndef OPENSSL_NO_SCTP
 554                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 555                                         {
 556                                         s->d1->next_state = s->s3->tmp.next_state;
 557                                         s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
 558                                         }
 559 #endif
 560 #endif
 561                                 s->init_num=0;
 562                                 }
 563                         break;
 564
 565                 case SSL3_ST_SW_SRVR_DONE_A:
 566                 case SSL3_ST_SW_SRVR_DONE_B:
 567                         dtls1_start_timer(s);
 568                         ret=dtls1_send_server_done(s);
 569                         if (ret <= 0) goto end;
 570                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 571                         s->state=SSL3_ST_SW_FLUSH;
 572                         s->init_num=0;
 573                         break;
 574
 575                 case SSL3_ST_SW_FLUSH:
 576                         s->rwstate=SSL_WRITING;
 577                         if (BIO_flush(s->wbio) <= 0)
 578                                 {
 579                                 /* If the write error was fatal, stop trying */
 580                                 if (!BIO_should_retry(s->wbio))
 581                                         {
 582                                         s->rwstate=SSL_NOTHING;
 583                                         s->state=s->s3->tmp.next_state;
 584                                         }
 585
 586                                 ret= -1;
 587                                 goto end;
 588                                 }
 589                         s->rwstate=SSL_NOTHING;
 590                         s->state=s->s3->tmp.next_state;
 591                         break;
 592
 593                 case SSL3_ST_SR_CERT_A:
 594                 case SSL3_ST_SR_CERT_B:
 595                         /* Check for second client hello (MS SGC) */
 596                         ret = ssl3_check_client_hello(s);
 597                         if (ret <= 0)
 598                                 goto end;
 599                         if (ret == 2)
 600                                 {
 601                                 dtls1_stop_timer(s);
 602                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 603                                 }
 604                         else {
 605                                 if (s->s3->tmp.cert_request)
 606                                         {
 607                                         ret=ssl3_get_client_certificate(s);
 608                                         if (ret <= 0) goto end;
 609                                         }
 610                                 s->init_num=0;
 611                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 612                         }
 613                         break;
 614
 615                 case SSL3_ST_SR_KEY_EXCH_A:
 616                 case SSL3_ST_SR_KEY_EXCH_B:
 617                         ret=ssl3_get_client_key_exchange(s);
 618                         if (ret <= 0) goto end;
 619 #ifndef OPENSSL_NO_SCTP
 620                         /* Add new shared key for SCTP-Auth,
 621                          * will be ignored if no SCTP used.
 622                          */
 623                         snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 624                                  DTLS1_SCTP_AUTH_LABEL);
 625
 626                         SSL_export_keying_material(s, sctpauthkey,
 627                                                    sizeof(sctpauthkey), labelbuffer,
 628                                                    sizeof(labelbuffer), NULL, 0, 0);
 629
 630                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 631                                  sizeof(sctpauthkey), sctpauthkey);
 632 #endif
 633
 634                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 635                         s->init_num=0;
 636
 637                         if (ret == 2)
 638                                 {
 639                                 /* For the ECDH ciphersuites when
 640                                  * the client sends its ECDH pub key in
 641                                  * a certificate, the CertificateVerify
 642                                  * message is not sent.
 643                                  */
 644                                 s->state=SSL3_ST_SR_FINISHED_A;
 645                                 s->init_num = 0;
 646                                 }
 647                         else
 648                                 {
 649                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 650                                 s->init_num=0;
 651
 652                                 /* We need to get hashes here so if there is
 653                                  * a client cert, it can be verified */
 654                                 s->method->ssl3_enc->cert_verify_mac(s,
 655                                         NID_md5,
 656                                         &(s->s3->tmp.cert_verify_md[0]));
 657                                 s->method->ssl3_enc->cert_verify_mac(s,
 658                                         NID_sha1,
 659                                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 660                                 }
 661                         break;
 662
 663                 case SSL3_ST_SR_CERT_VRFY_A:
 664                 case SSL3_ST_SR_CERT_VRFY_B:
 665                         /*
 666                          * This *should* be the first time we enable CCS, but be
 667                          * extra careful about surrounding code changes. We need
 668                          * to set this here because we don't know if we're
 669                          * expecting a CertificateVerify or not.
 670                          */
 671                         if (!s->s3->change_cipher_spec)
 672                                 s->d1->change_cipher_spec_ok = 1;
 673                         /* we should decide if we expected this one */
 674                         ret=ssl3_get_cert_verify(s);
 675                         if (ret <= 0) goto end;
 676 #ifndef OPENSSL_NO_SCTP
 677                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 678                             state == SSL_ST_RENEGOTIATE)
 679                                 s->state=DTLS1_SCTP_ST_SR_READ_SOCK;
 680                         else
 681 #endif
 682                                 s->state=SSL3_ST_SR_FINISHED_A;
 683                         s->init_num=0;
 684                         break;
 685
 686                 case SSL3_ST_SR_FINISHED_A:
 687                 case SSL3_ST_SR_FINISHED_B:
 688                         /*
 689                          * Enable CCS for resumed handshakes.
 690                          * In a full handshake, we end up here through
 691                          * SSL3_ST_SR_CERT_VRFY_B, so change_cipher_spec_ok was
 692                          * already set. Receiving a CCS clears the flag, so make
 693                          * sure not to re-enable it to ban duplicates.
 694                          * s->s3->change_cipher_spec is set when a CCS is
 695                          * processed in d1_pkt.c, and remains set until
 696                          * the client's Finished message is read.
 697                          */
 698                         if (!s->s3->change_cipher_spec)
 699                                 s->d1->change_cipher_spec_ok = 1;
 700                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 701                                 SSL3_ST_SR_FINISHED_B);
 702                         if (ret <= 0) goto end;
 703                         dtls1_stop_timer(s);
 704                         if (s->hit)
 705                                 s->state=SSL_ST_OK;
 706 #ifndef OPENSSL_NO_TLSEXT
 707                         else if (s->tlsext_ticket_expected)
 708                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 709 #endif
 710                         else
 711                                 s->state=SSL3_ST_SW_CHANGE_A;
 712                         s->init_num=0;
 713                         break;
 714
 715 #ifndef OPENSSL_NO_TLSEXT
 716                 case SSL3_ST_SW_SESSION_TICKET_A:
 717                 case SSL3_ST_SW_SESSION_TICKET_B:
 718                         ret=dtls1_send_newsession_ticket(s);
 719                         if (ret <= 0) goto end;
 720                         s->state=SSL3_ST_SW_CHANGE_A;
 721                         s->init_num=0;
 722                         break;
 723
 724                 case SSL3_ST_SW_CERT_STATUS_A:
 725                 case SSL3_ST_SW_CERT_STATUS_B:
 726                         ret=ssl3_send_cert_status(s);
 727                         if (ret <= 0) goto end;
 728                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 729                         s->init_num=0;
 730                         break;
 731
 732 #endif
 733
 734                 case SSL3_ST_SW_CHANGE_A:
 735                 case SSL3_ST_SW_CHANGE_B:
 736
 737                         s->session->cipher=s->s3->tmp.new_cipher;
 738                         if (!s->method->ssl3_enc->setup_key_block(s))
 739                                 { ret= -1; goto end; }
 740
 741                         ret=dtls1_send_change_cipher_spec(s,
 742                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 743
 744                         if (ret <= 0) goto end;
 745
 746 #ifndef OPENSSL_NO_SCTP
 747                         if (!s->hit)
 748                                 {
 749                                 /* Change to new shared key of SCTP-Auth,
 750                                  * will be ignored if no SCTP used.
 751                                  */
 752                                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
 753                                 }
 754 #endif
 755
 756                         s->state=SSL3_ST_SW_FINISHED_A;
 757                         s->init_num=0;
 758
 759                         if (!s->method->ssl3_enc->change_cipher_state(s,
 760                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 761                                 {
 762                                 ret= -1;
 763                                 goto end;
 764                                 }
 765
 766                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 767                         break;
 768
 769                 case SSL3_ST_SW_FINISHED_A:
 770                 case SSL3_ST_SW_FINISHED_B:
 771                         ret=dtls1_send_finished(s,
 772                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 773                                 s->method->ssl3_enc->server_finished_label,
 774                                 s->method->ssl3_enc->server_finished_label_len);
 775                         if (ret <= 0) goto end;
 776                         s->state=SSL3_ST_SW_FLUSH;
 777                         if (s->hit)
 778                                 {
 779                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 780
 781 #ifndef OPENSSL_NO_SCTP
 782                                 /* Change to new shared key of SCTP-Auth,
 783                                  * will be ignored if no SCTP used.
 784                                  */
 785                                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
 786 #endif
 787                                 }
 788                         else
 789                                 {
 790                                 s->s3->tmp.next_state=SSL_ST_OK;
 791 #ifndef OPENSSL_NO_SCTP
 792                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 793                                         {
 794                                         s->d1->next_state = s->s3->tmp.next_state;
 795                                         s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
 796                                         }
 797 #endif
 798                                 }
 799                         s->init_num=0;
 800                         break;
 801
 802                 case SSL_ST_OK:
 803                         /* clean a few things up */
 804                         ssl3_cleanup_key_block(s);
 805
 806 #if 0
 807                         BUF_MEM_free(s->init_buf);
 808                         s->init_buf=NULL;
 809 #endif
 810
 811                         /* remove buffering on output */
 812                         ssl_free_wbio_buffer(s);
 813
 814                         s->init_num=0;
 815
 816                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 817                                 {
 818                                 s->renegotiate=0;
 819                                 s->new_session=0;
 820
 821                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 822
 823                                 s->ctx->stats.sess_accept_good++;
 824                                 /* s->server=1; */
 825                                 s->handshake_func=dtls1_accept;
 826
 827                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 828                                 }
 829
 830                         ret = 1;
 831
 832                         /* done handshaking, next message is client hello */
 833                         s->d1->handshake_read_seq = 0;
 834                         /* next message is server hello */
 835                         s->d1->handshake_write_seq = 0;
 836                         s->d1->next_handshake_write_seq = 0;
 837                         goto end;
 838                         /* break; */
 839
 840                 default:
 841                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 842                         ret= -1;
 843                         goto end;
 844                         /* break; */
 845                         }
 846
 847                 if (!s->s3->tmp.reuse_message && !skip)
 848                         {
 849                         if (s->debug)
 850                                 {
 851                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 852                                         goto end;
 853                                 }
 854
 855
 856                         if ((cb != NULL) && (s->state != state))
 857                                 {
 858                                 new_state=s->state;
 859                                 s->state=state;
 860                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 861                                 s->state=new_state;
 862                                 }
 863                         }
 864                 skip=0;
 865                 }
 866 end:
 867         /* BIO_flush(s->wbio); */
 868
 869         s->in_handshake--;
 870 #ifndef OPENSSL_NO_SCTP
 871                 /* Notify SCTP BIO socket to leave handshake
 872                  * mode and prevent stream identifier other
 873                  * than 0. Will be ignored if no SCTP is used.
 874                  */
 875                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
 876 #endif
 877
 878         if (cb != NULL)
 879                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 880         return(ret);
 881         }
 882
 883 int dtls1_send_hello_request(SSL *s)
 884         {
 885         unsigned char *p;
 886
 887         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 888                 {
 889                 p=(unsigned char *)s->init_buf->data;
 890                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 891
 892                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 893                 /* number of bytes to write */
 894                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 895                 s->init_off=0;
 896
 897                 /* no need to buffer this message, since there are no retransmit
 898                  * requests for it */
 899                 }
 900
 901         /* SSL3_ST_SW_HELLO_REQ_B */
 902         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 903         }
 904
 905 int dtls1_send_hello_verify_request(SSL *s)
 906         {
 907         unsigned int msg_len;
 908         unsigned char *msg, *buf, *p;
 909
 910         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 911                 {
 912                 buf = (unsigned char *)s->init_buf->data;
 913
 914                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 915                 *(p++) = s->version >> 8;
 916                 *(p++) = s->version & 0xFF;
 917
 918                 if (s->ctx->app_gen_cookie_cb == NULL ||
 919                      s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 920                          &(s->d1->cookie_len)) == 0)
 921                         {
 922                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 923                         return 0;
 924                         }
 925
 926                 *(p++) = (unsigned char) s->d1->cookie_len;
 927                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 928                 p += s->d1->cookie_len;
 929                 msg_len = p - msg;
 930
 931                 dtls1_set_message_header(s, buf,
 932                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 933
 934                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 935                 /* number of bytes to write */
 936                 s->init_num=p-buf;
 937                 s->init_off=0;
 938                 }
 939
 940         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 941         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 942         }
 943
 944 int dtls1_send_server_hello(SSL *s)
 945         {
 946         unsigned char *buf;
 947         unsigned char *p,*d;
 948         int i;
 949         unsigned int sl;
 950         unsigned long l;
 951
 952         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 953                 {
 954                 buf=(unsigned char *)s->init_buf->data;
 955                 p=s->s3->server_random;
 956                 ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE);
 957                 /* Do the message type and length last */
 958                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 959
 960                 *(p++)=s->version>>8;
 961                 *(p++)=s->version&0xff;
 962
 963                 /* Random stuff */
 964                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 965                 p+=SSL3_RANDOM_SIZE;
 966
 967                 /* now in theory we have 3 options to sending back the
 968                  * session id.  If it is a re-use, we send back the
 969                  * old session-id, if it is a new session, we send
 970                  * back the new session-id or we send back a 0 length
 971                  * session-id if we want it to be single use.
 972                  * Currently I will not implement the '0' length session-id
 973                  * 12-Jan-98 - I'll now support the '0' length stuff.
 974                  */
 975                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 976                         s->session->session_id_length=0;
 977
 978                 sl=s->session->session_id_length;
 979                 if (sl > sizeof s->session->session_id)
 980                         {
 981                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 982                         return -1;
 983                         }
 984                 *(p++)=sl;
 985                 memcpy(p,s->session->session_id,sl);
 986                 p+=sl;
 987
 988                 /* put the cipher */
 989                 if (s->s3->tmp.new_cipher == NULL)
 990                         return -1;
 991                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 992                 p+=i;
 993
 994                 /* put the compression method */
 995 #ifdef OPENSSL_NO_COMP
 996                 *(p++)=0;
 997 #else
 998                 if (s->s3->tmp.new_compression == NULL)
 999                         *(p++)=0;
1000                 else
1001                         *(p++)=s->s3->tmp.new_compression->id;
1002 #endif
1003
1004 #ifndef OPENSSL_NO_TLSEXT
1005                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1006                         {
1007                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1008                         return -1;
1009                         }
1010                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1011                         {
1012                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1013                         return -1;
1014                         }
1015 #endif
1016
1017                 /* do the header */
1018                 l=(p-d);
1019                 d=buf;
1020
1021                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
1022
1023                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1024                 /* number of bytes to write */
1025                 s->init_num=p-buf;
1026                 s->init_off=0;
1027
1028                 /* buffer the message to handle re-xmits */
1029                 dtls1_buffer_message(s, 0);
1030                 }
1031
1032         /* SSL3_ST_SW_SRVR_HELLO_B */
1033         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1034         }
1035
1036 int dtls1_send_server_done(SSL *s)
1037         {
1038         unsigned char *p;
1039
1040         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1041                 {
1042                 p=(unsigned char *)s->init_buf->data;
1043
1044                 /* do the header */
1045                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
1046
1047                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1048                 /* number of bytes to write */
1049                 s->init_num=DTLS1_HM_HEADER_LENGTH;
1050                 s->init_off=0;
1051
1052                 /* buffer the message to handle re-xmits */
1053                 dtls1_buffer_message(s, 0);
1054                 }
1055
1056         /* SSL3_ST_SW_SRVR_DONE_B */
1057         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1058         }
1059
1060 int dtls1_send_server_key_exchange(SSL *s)
1061         {
1062 #ifndef OPENSSL_NO_RSA
1063         unsigned char *q;
1064         int j,num;
1065         RSA *rsa;
1066         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1067         unsigned int u;
1068 #endif
1069 #ifndef OPENSSL_NO_DH
1070         DH *dh=NULL,*dhp;
1071 #endif
1072 #ifndef OPENSSL_NO_ECDH
1073         EC_KEY *ecdh=NULL, *ecdhp;
1074         unsigned char *encodedPoint = NULL;
1075         int encodedlen = 0;
1076         int curve_id = 0;
1077         BN_CTX *bn_ctx = NULL;
1078 #endif
1079         EVP_PKEY *pkey;
1080         unsigned char *p,*d;
1081         int al,i;
1082         unsigned long type;
1083         int n;
1084         CERT *cert;
1085         BIGNUM *r[4];
1086         int nr[4],kn;
1087         BUF_MEM *buf;
1088         EVP_MD_CTX md_ctx;
1089
1090         EVP_MD_CTX_init(&md_ctx);
1091         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1092                 {
1093                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1094                 cert=s->cert;
1095
1096                 buf=s->init_buf;
1097
1098                 r[0]=r[1]=r[2]=r[3]=NULL;
1099                 n=0;
1100 #ifndef OPENSSL_NO_RSA
1101                 if (type & SSL_kRSA)
1102                         {
1103                         rsa=cert->rsa_tmp;
1104                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1105                                 {
1106                                 rsa=s->cert->rsa_tmp_cb(s,
1107                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1108                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1109                                 if(rsa == NULL)
1110                                 {
1111                                         al=SSL_AD_HANDSHAKE_FAILURE;
1112                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1113                                         goto f_err;
1114                                 }
1115                                 RSA_up_ref(rsa);
1116                                 cert->rsa_tmp=rsa;
1117                                 }
1118                         if (rsa == NULL)
1119                                 {
1120                                 al=SSL_AD_HANDSHAKE_FAILURE;
1121                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1122                                 goto f_err;
1123                                 }
1124                         r[0]=rsa->n;
1125                         r[1]=rsa->e;
1126                         s->s3->tmp.use_rsa_tmp=1;
1127                         }
1128                 else
1129 #endif
1130 #ifndef OPENSSL_NO_DH
1131                         if (type & SSL_kEDH)
1132                         {
1133                         dhp=cert->dh_tmp;
1134                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1135                                 dhp=s->cert->dh_tmp_cb(s,
1136                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1137                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1138                         if (dhp == NULL)
1139                                 {
1140                                 al=SSL_AD_HANDSHAKE_FAILURE;
1141                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1142                                 goto f_err;
1143                                 }
1144
1145                         if (s->s3->tmp.dh != NULL)
1146                                 {
1147                                 DH_free(dh);
1148                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1149                                 goto err;
1150                                 }
1151
1152                         if ((dh=DHparams_dup(dhp)) == NULL)
1153                                 {
1154                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1155                                 goto err;
1156                                 }
1157
1158                         s->s3->tmp.dh=dh;
1159                         if ((dhp->pub_key == NULL ||
1160                              dhp->priv_key == NULL ||
1161                              (s->options & SSL_OP_SINGLE_DH_USE)))
1162                                 {
1163                                 if(!DH_generate_key(dh))
1164                                     {
1165                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1166                                            ERR_R_DH_LIB);
1167                                     goto err;
1168                                     }
1169                                 }
1170                         else
1171                                 {
1172                                 dh->pub_key=BN_dup(dhp->pub_key);
1173                                 dh->priv_key=BN_dup(dhp->priv_key);
1174                                 if ((dh->pub_key == NULL) ||
1175                                         (dh->priv_key == NULL))
1176                                         {
1177                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1178                                         goto err;
1179                                         }
1180                                 }
1181                         r[0]=dh->p;
1182                         r[1]=dh->g;
1183                         r[2]=dh->pub_key;
1184                         }
1185                 else
1186 #endif
1187 #ifndef OPENSSL_NO_ECDH
1188                         if (type & SSL_kEECDH)
1189                         {
1190                         const EC_GROUP *group;
1191
1192                         ecdhp=cert->ecdh_tmp;
1193                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1194                                 {
1195                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1196                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1197                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1198                                 }
1199                         if (ecdhp == NULL)
1200                                 {
1201                                 al=SSL_AD_HANDSHAKE_FAILURE;
1202                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1203                                 goto f_err;
1204                                 }
1205
1206                         if (s->s3->tmp.ecdh != NULL)
1207                                 {
1208                                 EC_KEY_free(s->s3->tmp.ecdh);
1209                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1210                                 goto err;
1211                                 }
1212
1213                         /* Duplicate the ECDH structure. */
1214                         if (ecdhp == NULL)
1215                                 {
1216                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1217                                 goto err;
1218                                 }
1219                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1220                                 {
1221                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1222                                 goto err;
1223                                 }
1224
1225                         s->s3->tmp.ecdh=ecdh;
1226                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1227                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1228                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1229                                 {
1230                                 if(!EC_KEY_generate_key(ecdh))
1231                                     {
1232                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1233                                     goto err;
1234                                     }
1235                                 }
1236
1237                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1238                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1239                             (EC_KEY_get0_private_key(ecdh) == NULL))
1240                                 {
1241                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1242                                 goto err;
1243                                 }
1244
1245                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1246                             (EC_GROUP_get_degree(group) > 163))
1247                                 {
1248                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1249                                 goto err;
1250                                 }
1251
1252                         /* XXX: For now, we only support ephemeral ECDH
1253                          * keys over named (not generic) curves. For
1254                          * supported named curves, curve_id is non-zero.
1255                          */
1256                         if ((curve_id =
1257                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1258                             == 0)
1259                                 {
1260                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1261                                 goto err;
1262                                 }
1263
1264                         /* Encode the public key.
1265                          * First check the size of encoding and
1266                          * allocate memory accordingly.
1267                          */
1268                         encodedlen = EC_POINT_point2oct(group,
1269                             EC_KEY_get0_public_key(ecdh),
1270                             POINT_CONVERSION_UNCOMPRESSED,
1271                             NULL, 0, NULL);
1272
1273                         encodedPoint = (unsigned char *)
1274                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1275                         bn_ctx = BN_CTX_new();
1276                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1277                                 {
1278                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1279                                 goto err;
1280                                 }
1281
1282
1283                         encodedlen = EC_POINT_point2oct(group,
1284                             EC_KEY_get0_public_key(ecdh),
1285                             POINT_CONVERSION_UNCOMPRESSED,
1286                             encodedPoint, encodedlen, bn_ctx);
1287
1288                         if (encodedlen == 0)
1289                                 {
1290                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1291                                 goto err;
1292                                 }
1293
1294                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1295
1296                         /* XXX: For now, we only support named (not
1297                          * generic) curves in ECDH ephemeral key exchanges.
1298                          * In this situation, we need four additional bytes
1299                          * to encode the entire ServerECDHParams
1300                          * structure.
1301                          */
1302                         n = 4 + encodedlen;
1303
1304                         /* We'll generate the serverKeyExchange message
1305                          * explicitly so we can set these to NULLs
1306                          */
1307                         r[0]=NULL;
1308                         r[1]=NULL;
1309                         r[2]=NULL;
1310                         r[3]=NULL;
1311                         }
1312                 else
1313 #endif /* !OPENSSL_NO_ECDH */
1314 #ifndef OPENSSL_NO_PSK
1315                         if (type & SSL_kPSK)
1316                                 {
1317                                 /* reserve size for record length and PSK identity hint*/
1318                                 n+=2+strlen(s->ctx->psk_identity_hint);
1319                                 }
1320                         else
1321 #endif /* !OPENSSL_NO_PSK */
1322                         {
1323                         al=SSL_AD_HANDSHAKE_FAILURE;
1324                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1325                         goto f_err;
1326                         }
1327                 for (i=0; r[i] != NULL; i++)
1328                         {
1329                         nr[i]=BN_num_bytes(r[i]);
1330                         n+=2+nr[i];
1331                         }
1332
1333                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1334                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1335                         {
1336                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL))
1337                                 == NULL)
1338                                 {
1339                                 al=SSL_AD_DECODE_ERROR;
1340                                 goto f_err;
1341                                 }
1342                         kn=EVP_PKEY_size(pkey);
1343                         }
1344                 else
1345                         {
1346                         pkey=NULL;
1347                         kn=0;
1348                         }
1349
1350                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1351                         {
1352                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1353                         goto err;
1354                         }
1355                 d=(unsigned char *)s->init_buf->data;
1356                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1357
1358                 for (i=0; r[i] != NULL; i++)
1359                         {
1360                         s2n(nr[i],p);
1361                         BN_bn2bin(r[i],p);
1362                         p+=nr[i];
1363                         }
1364
1365 #ifndef OPENSSL_NO_ECDH
1366                 if (type & SSL_kEECDH)
1367                         {
1368                         /* XXX: For now, we only support named (not generic) curves.
1369                          * In this situation, the serverKeyExchange message has:
1370                          * [1 byte CurveType], [2 byte CurveName]
1371                          * [1 byte length of encoded point], followed by
1372                          * the actual encoded point itself
1373                          */
1374                         *p = NAMED_CURVE_TYPE;
1375                         p += 1;
1376                         *p = 0;
1377                         p += 1;
1378                         *p = curve_id;
1379                         p += 1;
1380                         *p = encodedlen;
1381                         p += 1;
1382                         memcpy((unsigned char*)p,
1383                             (unsigned char *)encodedPoint,
1384                             encodedlen);
1385                         OPENSSL_free(encodedPoint);
1386                         encodedPoint = NULL;
1387                         p += encodedlen;
1388                         }
1389 #endif
1390
1391 #ifndef OPENSSL_NO_PSK
1392                 if (type & SSL_kPSK)
1393                         {
1394                         /* copy PSK identity hint */
1395                         s2n(strlen(s->ctx->psk_identity_hint), p);
1396                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1397                         p+=strlen(s->ctx->psk_identity_hint);
1398                         }
1399 #endif
1400
1401                 /* not anonymous */
1402                 if (pkey != NULL)
1403                         {
1404                         /* n is the length of the params, they start at
1405                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1406                          * at the end. */
1407 #ifndef OPENSSL_NO_RSA
1408                         if (pkey->type == EVP_PKEY_RSA)
1409                                 {
1410                                 q=md_buf;
1411                                 j=0;
1412                                 for (num=2; num > 0; num--)
1413                                         {
1414                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1415                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1416                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1417                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1418                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1419                                         EVP_DigestFinal_ex(&md_ctx,q,
1420                                                 (unsigned int *)&i);
1421                                         q+=i;
1422                                         j+=i;
1423                                         }
1424                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1425                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1426                                         {
1427                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1428                                         goto err;
1429                                         }
1430                                 s2n(u,p);
1431                                 n+=u+2;
1432                                 }
1433                         else
1434 #endif
1435 #if !defined(OPENSSL_NO_DSA)
1436                                 if (pkey->type == EVP_PKEY_DSA)
1437                                 {
1438                                 /* lets do DSS */
1439                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1440                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1441                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1442                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1443                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1444                                         (unsigned int *)&i,pkey))
1445                                         {
1446                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1447                                         goto err;
1448                                         }
1449                                 s2n(i,p);
1450                                 n+=i+2;
1451                                 }
1452                         else
1453 #endif
1454 #if !defined(OPENSSL_NO_ECDSA)
1455                                 if (pkey->type == EVP_PKEY_EC)
1456                                 {
1457                                 /* let's do ECDSA */
1458                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1459                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1460                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1461                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1462                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1463                                         (unsigned int *)&i,pkey))
1464                                         {
1465                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1466                                         goto err;
1467                                         }
1468                                 s2n(i,p);
1469                                 n+=i+2;
1470                                 }
1471                         else
1472 #endif
1473                                 {
1474                                 /* Is this error check actually needed? */
1475                                 al=SSL_AD_HANDSHAKE_FAILURE;
1476                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1477                                 goto f_err;
1478                                 }
1479                         }
1480
1481                 d = dtls1_set_message_header(s, d,
1482                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1483
1484                 /* we should now have things packed up, so lets send
1485                  * it off */
1486                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1487                 s->init_off=0;
1488
1489                 /* buffer the message to handle re-xmits */
1490                 dtls1_buffer_message(s, 0);
1491                 }
1492
1493         s->state = SSL3_ST_SW_KEY_EXCH_B;
1494         EVP_MD_CTX_cleanup(&md_ctx);
1495         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1496 f_err:
1497         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1498 err:
1499 #ifndef OPENSSL_NO_ECDH
1500         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1501         BN_CTX_free(bn_ctx);
1502 #endif
1503         EVP_MD_CTX_cleanup(&md_ctx);
1504         return(-1);
1505         }
1506
1507 int dtls1_send_certificate_request(SSL *s)
1508         {
1509         unsigned char *p,*d;
1510         int i,j,nl,off,n;
1511         STACK_OF(X509_NAME) *sk=NULL;
1512         X509_NAME *name;
1513         BUF_MEM *buf;
1514         unsigned int msg_len;
1515
1516         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1517                 {
1518                 buf=s->init_buf;
1519
1520                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1521
1522                 /* get the list of acceptable cert types */
1523                 p++;
1524                 n=ssl3_get_req_cert_type(s,p);
1525                 d[0]=n;
1526                 p+=n;
1527                 n++;
1528
1529                 off=n;
1530                 p+=2;
1531                 n+=2;
1532
1533                 sk=SSL_get_client_CA_list(s);
1534                 nl=0;
1535                 if (sk != NULL)
1536                         {
1537                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1538                                 {
1539                                 name=sk_X509_NAME_value(sk,i);
1540                                 j=i2d_X509_NAME(name,NULL);
1541                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1542                                         {
1543                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1544                                         goto err;
1545                                         }
1546                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1547                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1548                                         {
1549                                         s2n(j,p);
1550                                         i2d_X509_NAME(name,&p);
1551                                         n+=2+j;
1552                                         nl+=2+j;
1553                                         }
1554                                 else
1555                                         {
1556                                         d=p;
1557                                         i2d_X509_NAME(name,&p);
1558                                         j-=2; s2n(j,d); j+=2;
1559                                         n+=j;
1560                                         nl+=j;
1561                                         }
1562                                 }
1563                         }
1564                 /* else no CA names */
1565                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1566                 s2n(nl,p);
1567
1568                 d=(unsigned char *)buf->data;
1569                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1570                 l2n3(n,d);
1571                 s2n(s->d1->handshake_write_seq,d);
1572                 s->d1->handshake_write_seq++;
1573
1574                 /* we should now have things packed up, so lets send
1575                  * it off */
1576
1577                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1578                 s->init_off=0;
1579 #ifdef NETSCAPE_HANG_BUG
1580 /* XXX: what to do about this? */
1581                 p=(unsigned char *)s->init_buf->data + s->init_num;
1582
1583                 /* do the header */
1584                 *(p++)=SSL3_MT_SERVER_DONE;
1585                 *(p++)=0;
1586                 *(p++)=0;
1587                 *(p++)=0;
1588                 s->init_num += 4;
1589 #endif
1590
1591                 /* XDTLS:  set message header ? */
1592                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1593                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1594                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1595
1596                 /* buffer the message to handle re-xmits */
1597                 dtls1_buffer_message(s, 0);
1598
1599                 s->state = SSL3_ST_SW_CERT_REQ_B;
1600                 }
1601
1602         /* SSL3_ST_SW_CERT_REQ_B */
1603         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1604 err:
1605         return(-1);
1606         }
1607
1608 int dtls1_send_server_certificate(SSL *s)
1609         {
1610         unsigned long l;
1611         X509 *x;
1612
1613         if (s->state == SSL3_ST_SW_CERT_A)
1614                 {
1615                 x=ssl_get_server_send_cert(s);
1616                 if (x == NULL)
1617                         {
1618                         /* VRS: allow null cert if auth == KRB5 */
1619                         if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1620                             (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1621                                 {
1622                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1623                                 return(0);
1624                                 }
1625                         }
1626
1627                 l=dtls1_output_cert_chain(s,x);
1628                 if (!l)
1629                         {
1630                         SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1631                         return(0);
1632                         }
1633                 s->state=SSL3_ST_SW_CERT_B;
1634                 s->init_num=(int)l;
1635                 s->init_off=0;
1636
1637                 /* buffer the message to handle re-xmits */
1638                 dtls1_buffer_message(s, 0);
1639                 }
1640
1641         /* SSL3_ST_SW_CERT_B */
1642         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1643         }
1644
1645 #ifndef OPENSSL_NO_TLSEXT
1646 int dtls1_send_newsession_ticket(SSL *s)
1647         {
1648         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1649                 {
1650                 unsigned char *p, *senc, *macstart;
1651                 int len, slen;
1652                 unsigned int hlen, msg_len;
1653                 EVP_CIPHER_CTX ctx;
1654                 HMAC_CTX hctx;
1655                 SSL_CTX *tctx = s->initial_ctx;
1656                 unsigned char iv[EVP_MAX_IV_LENGTH];
1657                 unsigned char key_name[16];
1658
1659                 /* get session encoding length */
1660                 slen = i2d_SSL_SESSION(s->session, NULL);
1661                 /* Some length values are 16 bits, so forget it if session is
1662                  * too long
1663                  */
1664                 if (slen > 0xFF00)
1665                         return -1;
1666                 /* Grow buffer if need be: the length calculation is as
1667                  * follows 12 (DTLS handshake message header) +
1668                  * 4 (ticket lifetime hint) + 2 (ticket length) +
1669                  * 16 (key name) + max_iv_len (iv length) +
1670                  * session_length + max_enc_block_size (max encrypted session
1671                  * length) + max_md_size (HMAC).
1672                  */
1673                 if (!BUF_MEM_grow(s->init_buf,
1674                         DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1675                         EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1676                         return -1;
1677                 senc = OPENSSL_malloc(slen);
1678                 if (!senc)
1679                         return -1;
1680                 p = senc;
1681                 i2d_SSL_SESSION(s->session, &p);
1682
1683                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1684                 EVP_CIPHER_CTX_init(&ctx);
1685                 HMAC_CTX_init(&hctx);
1686                 /* Initialize HMAC and cipher contexts. If callback present
1687                  * it does all the work otherwise use generated values
1688                  * from parent ctx.
1689                  */
1690                 if (tctx->tlsext_ticket_key_cb)
1691                         {
1692                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1693                                                          &hctx, 1) < 0)
1694                                 {
1695                                 OPENSSL_free(senc);
1696                                 return -1;
1697                                 }
1698                         }
1699                 else
1700                         {
1701                         RAND_pseudo_bytes(iv, 16);
1702                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1703                                         tctx->tlsext_tick_aes_key, iv);
1704                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1705                                         tlsext_tick_md(), NULL);
1706                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1707                         }
1708                 l2n(s->session->tlsext_tick_lifetime_hint, p);
1709                 /* Skip ticket length for now */
1710                 p += 2;
1711                 /* Output key name */
1712                 macstart = p;
1713                 memcpy(p, key_name, 16);
1714                 p += 16;
1715                 /* output IV */
1716                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1717                 p += EVP_CIPHER_CTX_iv_length(&ctx);
1718                 /* Encrypt session data */
1719                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1720                 p += len;
1721                 EVP_EncryptFinal(&ctx, p, &len);
1722                 p += len;
1723                 EVP_CIPHER_CTX_cleanup(&ctx);
1724
1725                 HMAC_Update(&hctx, macstart, p - macstart);
1726                 HMAC_Final(&hctx, p, &hlen);
1727                 HMAC_CTX_cleanup(&hctx);
1728
1729                 p += hlen;
1730                 /* Now write out lengths: p points to end of data written */
1731                 /* Total length */
1732                 len = p - (unsigned char *)(s->init_buf->data);
1733                 /* Ticket length */
1734                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1735                 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1736
1737                 /* number of bytes to write */
1738                 s->init_num= len;
1739                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1740                 s->init_off=0;
1741                 OPENSSL_free(senc);
1742
1743                 /* XDTLS:  set message header ? */
1744                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1745                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1746                         SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1747
1748                 /* buffer the message to handle re-xmits */
1749                 dtls1_buffer_message(s, 0);
1750                 }
1751
1752         /* SSL3_ST_SW_SESSION_TICKET_B */
1753         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1754         }
1755 #endif