ssl/d1_clnt.c

   1 /* ssl/d1_clnt.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 #ifndef OPENSSL_NO_KRB5
 119 #include "kssl_lcl.h"
 120 #endif
 121 #include <openssl/buffer.h>
 122 #include <openssl/rand.h>
 123 #include <openssl/objects.h>
 124 #include <openssl/evp.h>
 125 #include <openssl/md5.h>
 126 #include <openssl/bn.h>
 127 #ifndef OPENSSL_NO_DH
 128 #include <openssl/dh.h>
 129 #endif
 130
 131 static const SSL_METHOD *dtls1_get_client_method(int ver);
 132 static int dtls1_get_hello_verify(SSL *s);
 133
 134 static const SSL_METHOD *dtls1_get_client_method(int ver)
 135         {
 136         if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
 137                 return(DTLSv1_client_method());
 138         else
 139                 return(NULL);
 140         }
 141
 142 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
 143                         ssl_undefined_function,
 144                         dtls1_connect,
 145                         dtls1_get_client_method)
 146
 147 int dtls1_connect(SSL *s)
 148         {
 149         BUF_MEM *buf=NULL;
 150         unsigned long Time=(unsigned long)time(NULL);
 151         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 152         int ret= -1;
 153         int new_state,state,skip=0;
 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         s->in_handshake++;
 169         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 170
 171 #ifndef OPENSSL_NO_SCTP
 172         /* Notify SCTP BIO socket to enter handshake
 173          * mode and prevent stream identifier other
 174          * than 0. Will be ignored if no SCTP is used.
 175          */
 176         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
 177 #endif
 178
 179 #ifndef OPENSSL_NO_HEARTBEATS
 180         /* If we're awaiting a HeartbeatResponse, pretend we
 181          * already got and don't await it anymore, because
 182          * Heartbeats don't make sense during handshakes anyway.
 183          */
 184         if (s->tlsext_hb_pending)
 185                 {
 186                 dtls1_stop_timer(s);
 187                 s->tlsext_hb_pending = 0;
 188                 s->tlsext_hb_seq++;
 189                 }
 190 #endif
 191
 192         for (;;)
 193                 {
 194                 state=s->state;
 195
 196                 switch(s->state)
 197                         {
 198                 case SSL_ST_RENEGOTIATE:
 199                         s->renegotiate=1;
 200                         s->state=SSL_ST_CONNECT;
 201                         s->ctx->stats.sess_connect_renegotiate++;
 202                         /* break */
 203                 case SSL_ST_BEFORE:
 204                 case SSL_ST_CONNECT:
 205                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 206                 case SSL_ST_OK|SSL_ST_CONNECT:
 207
 208                         s->server=0;
 209                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 210
 211                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
 212                             (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
 213                                 {
 214                                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 215                                 ret = -1;
 216                                 goto end;
 217                                 }
 218
 219                         /* s->version=SSL3_VERSION; */
 220                         s->type=SSL_ST_CONNECT;
 221
 222                         if (s->init_buf == NULL)
 223                                 {
 224                                 if ((buf=BUF_MEM_new()) == NULL)
 225                                         {
 226                                         ret= -1;
 227                                         goto end;
 228                                         }
 229                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 230                                         {
 231                                         ret= -1;
 232                                         goto end;
 233                                         }
 234                                 s->init_buf=buf;
 235                                 buf=NULL;
 236                                 }
 237
 238                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 239
 240                         /* setup buffing BIO */
 241                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 242
 243                         /* don't push the buffering BIO quite yet */
 244
 245                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 246                         s->ctx->stats.sess_connect++;
 247                         s->init_num=0;
 248                         /* mark client_random uninitialized */
 249                         memset(s->s3->client_random,0,sizeof(s->s3->client_random));
 250                         s->d1->send_cookie = 0;
 251                         s->hit = 0;
 252                         break;
 253
 254 #ifndef OPENSSL_NO_SCTP
 255                 case DTLS1_SCTP_ST_CR_READ_SOCK:
 256
 257                         if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
 258                         {
 259                                 s->s3->in_read_app_data=2;
 260                                 s->rwstate=SSL_READING;
 261                                 BIO_clear_retry_flags(SSL_get_rbio(s));
 262                                 BIO_set_retry_read(SSL_get_rbio(s));
 263                                 ret = -1;
 264                                 goto end;
 265                         }
 266
 267                         s->state=s->s3->tmp.next_state;
 268                         break;
 269
 270                 case DTLS1_SCTP_ST_CW_WRITE_SOCK:
 271                         /* read app data until dry event */
 272
 273                         ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
 274                         if (ret < 0) goto end;
 275
 276                         if (ret == 0)
 277                         {
 278                                 s->s3->in_read_app_data=2;
 279                                 s->rwstate=SSL_READING;
 280                                 BIO_clear_retry_flags(SSL_get_rbio(s));
 281                                 BIO_set_retry_read(SSL_get_rbio(s));
 282                                 ret = -1;
 283                                 goto end;
 284                         }
 285
 286                         s->state=s->d1->next_state;
 287                         break;
 288 #endif
 289
 290                 case SSL3_ST_CW_CLNT_HELLO_A:
 291                 case SSL3_ST_CW_CLNT_HELLO_B:
 292
 293                         s->shutdown=0;
 294
 295                         /* every DTLS ClientHello resets Finished MAC */
 296                         ssl3_init_finished_mac(s);
 297
 298                         dtls1_start_timer(s);
 299                         ret=ssl3_client_hello(s);
 300                         if (ret <= 0) goto end;
 301
 302                         if ( s->d1->send_cookie)
 303                                 {
 304                                 s->state=SSL3_ST_CW_FLUSH;
 305                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 306                                 }
 307                         else
 308                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 309
 310                         s->init_num=0;
 311
 312 #ifndef OPENSSL_NO_SCTP
 313                         /* Disable buffering for SCTP */
 314                         if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
 315                                 {
 316 #endif
 317                                 /* turn on buffering for the next lot of output */
 318                                 if (s->bbio != s->wbio)
 319                                         s->wbio=BIO_push(s->bbio,s->wbio);
 320 #ifndef OPENSSL_NO_SCTP
 321                                 }
 322 #endif
 323
 324                         break;
 325
 326                 case SSL3_ST_CR_SRVR_HELLO_A:
 327                 case SSL3_ST_CR_SRVR_HELLO_B:
 328                         ret=ssl3_get_server_hello(s);
 329                         if (ret <= 0) goto end;
 330                         else
 331                                 {
 332                                 if (s->hit)
 333                                         {
 334 #ifndef OPENSSL_NO_SCTP
 335                                         /* Add new shared key for SCTP-Auth,
 336                                          * will be ignored if no SCTP used.
 337                                          */
 338                                         snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 339                                                  DTLS1_SCTP_AUTH_LABEL);
 340
 341                                         SSL_export_keying_material(s, sctpauthkey,
 342                                                                    sizeof(sctpauthkey), labelbuffer,
 343                                                                    sizeof(labelbuffer), NULL, 0, 0);
 344
 345                                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 346                                                          sizeof(sctpauthkey), sctpauthkey);
 347 #endif
 348
 349                                         s->state=SSL3_ST_CR_FINISHED_A;
 350                                         }
 351                                 else
 352                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 353                                 }
 354                         s->init_num=0;
 355                         break;
 356
 357                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 358                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 359
 360                         ret = dtls1_get_hello_verify(s);
 361                         if ( ret <= 0)
 362                                 goto end;
 363                         dtls1_stop_timer(s);
 364                         if ( s->d1->send_cookie) /* start again, with a cookie */
 365                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 366                         else
 367                                 s->state = SSL3_ST_CR_CERT_A;
 368                         s->init_num = 0;
 369                         break;
 370
 371                 case SSL3_ST_CR_CERT_A:
 372                 case SSL3_ST_CR_CERT_B:
 373 #ifndef OPENSSL_NO_TLSEXT
 374                         ret=ssl3_check_finished(s);
 375                         if (ret <= 0) goto end;
 376                         if (ret == 2)
 377                                 {
 378                                 s->hit = 1;
 379                                 if (s->tlsext_ticket_expected)
 380                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 381                                 else
 382                                         s->state=SSL3_ST_CR_FINISHED_A;
 383                                 s->init_num=0;
 384                                 break;
 385                                 }
 386 #endif
 387                         /* Check if it is anon DH or PSK */
 388                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 389                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 390                                 {
 391                                 ret=ssl3_get_server_certificate(s);
 392                                 if (ret <= 0) goto end;
 393 #ifndef OPENSSL_NO_TLSEXT
 394                                 if (s->tlsext_status_expected)
 395                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 396                                 else
 397                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 398                                 }
 399                         else
 400                                 {
 401                                 skip = 1;
 402                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 403                                 }
 404 #else
 405                                 }
 406                         else
 407                                 skip=1;
 408
 409                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 410 #endif
 411                         s->init_num=0;
 412                         break;
 413
 414                 case SSL3_ST_CR_KEY_EXCH_A:
 415                 case SSL3_ST_CR_KEY_EXCH_B:
 416                         ret=ssl3_get_key_exchange(s);
 417                         if (ret <= 0) goto end;
 418                         s->state=SSL3_ST_CR_CERT_REQ_A;
 419                         s->init_num=0;
 420
 421                         /* at this point we check that we have the
 422                          * required stuff from the server */
 423                         if (!ssl3_check_cert_and_algorithm(s))
 424                                 {
 425                                 ret= -1;
 426                                 goto end;
 427                                 }
 428                         break;
 429
 430                 case SSL3_ST_CR_CERT_REQ_A:
 431                 case SSL3_ST_CR_CERT_REQ_B:
 432                         ret=ssl3_get_certificate_request(s);
 433                         if (ret <= 0) goto end;
 434                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 435                         s->init_num=0;
 436                         break;
 437
 438                 case SSL3_ST_CR_SRVR_DONE_A:
 439                 case SSL3_ST_CR_SRVR_DONE_B:
 440                         ret=ssl3_get_server_done(s);
 441                         if (ret <= 0) goto end;
 442                         dtls1_stop_timer(s);
 443                         if (s->s3->tmp.cert_req)
 444                                 s->s3->tmp.next_state=SSL3_ST_CW_CERT_A;
 445                         else
 446                                 s->s3->tmp.next_state=SSL3_ST_CW_KEY_EXCH_A;
 447                         s->init_num=0;
 448
 449 #ifndef OPENSSL_NO_SCTP
 450                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 451                             state == SSL_ST_RENEGOTIATE)
 452                                 s->state=DTLS1_SCTP_ST_CR_READ_SOCK;
 453                         else
 454 #endif
 455                         s->state=s->s3->tmp.next_state;
 456                         break;
 457
 458                 case SSL3_ST_CW_CERT_A:
 459                 case SSL3_ST_CW_CERT_B:
 460                 case SSL3_ST_CW_CERT_C:
 461                 case SSL3_ST_CW_CERT_D:
 462                         dtls1_start_timer(s);
 463                         ret=ssl3_send_client_certificate(s);
 464                         if (ret <= 0) goto end;
 465                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 466                         s->init_num=0;
 467                         break;
 468
 469                 case SSL3_ST_CW_KEY_EXCH_A:
 470                 case SSL3_ST_CW_KEY_EXCH_B:
 471                         dtls1_start_timer(s);
 472                         ret=ssl3_send_client_key_exchange(s);
 473                         if (ret <= 0) goto end;
 474
 475 #ifndef OPENSSL_NO_SCTP
 476                         /* Add new shared key for SCTP-Auth,
 477                          * will be ignored if no SCTP used.
 478                          */
 479                         snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 480                                  DTLS1_SCTP_AUTH_LABEL);
 481
 482                         SSL_export_keying_material(s, sctpauthkey,
 483                                                    sizeof(sctpauthkey), labelbuffer,
 484                                                    sizeof(labelbuffer), NULL, 0, 0);
 485
 486                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 487                                          sizeof(sctpauthkey), sctpauthkey);
 488 #endif
 489
 490                         /* EAY EAY EAY need to check for DH fix cert
 491                          * sent back */
 492                         /* For TLS, cert_req is set to 2, so a cert chain
 493                          * of nothing is sent, but no verify packet is sent */
 494                         if (s->s3->tmp.cert_req == 1)
 495                                 {
 496                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 497                                 }
 498                         else
 499                                 {
 500 #ifndef OPENSSL_NO_SCTP
 501                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 502                                         {
 503                                         s->d1->next_state=SSL3_ST_CW_CHANGE_A;
 504                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 505                                         }
 506                                 else
 507 #endif
 508                                         s->state=SSL3_ST_CW_CHANGE_A;
 509                                 s->s3->change_cipher_spec=0;
 510                                 }
 511
 512                         s->init_num=0;
 513                         break;
 514
 515                 case SSL3_ST_CW_CERT_VRFY_A:
 516                 case SSL3_ST_CW_CERT_VRFY_B:
 517                         dtls1_start_timer(s);
 518                         ret=ssl3_send_client_verify(s);
 519                         if (ret <= 0) goto end;
 520 #ifndef OPENSSL_NO_SCTP
 521                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 522                         {
 523                                 s->d1->next_state=SSL3_ST_CW_CHANGE_A;
 524                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 525                         }
 526                         else
 527 #endif
 528                                 s->state=SSL3_ST_CW_CHANGE_A;
 529                         s->init_num=0;
 530                         s->s3->change_cipher_spec=0;
 531                         break;
 532
 533                 case SSL3_ST_CW_CHANGE_A:
 534                 case SSL3_ST_CW_CHANGE_B:
 535                         if (!s->hit)
 536                                 dtls1_start_timer(s);
 537                         ret=dtls1_send_change_cipher_spec(s,
 538                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 539                         if (ret <= 0) goto end;
 540
 541 #ifndef OPENSSL_NO_SCTP
 542                         /* Change to new shared key of SCTP-Auth,
 543                          * will be ignored if no SCTP used.
 544                          */
 545                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
 546 #endif
 547
 548                         s->state=SSL3_ST_CW_FINISHED_A;
 549                         s->init_num=0;
 550
 551                         s->session->cipher=s->s3->tmp.new_cipher;
 552 #ifdef OPENSSL_NO_COMP
 553                         s->session->compress_meth=0;
 554 #else
 555                         if (s->s3->tmp.new_compression == NULL)
 556                                 s->session->compress_meth=0;
 557                         else
 558                                 s->session->compress_meth=
 559                                         s->s3->tmp.new_compression->id;
 560 #endif
 561                         if (!s->method->ssl3_enc->setup_key_block(s))
 562                                 {
 563                                 ret= -1;
 564                                 goto end;
 565                                 }
 566
 567                         if (!s->method->ssl3_enc->change_cipher_state(s,
 568                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 569                                 {
 570                                 ret= -1;
 571                                 goto end;
 572                                 }
 573
 574                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 575                         break;
 576
 577                 case SSL3_ST_CW_FINISHED_A:
 578                 case SSL3_ST_CW_FINISHED_B:
 579                         if (!s->hit)
 580                                 dtls1_start_timer(s);
 581                         ret=ssl3_send_finished(s,
 582                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 583                                 s->method->ssl3_enc->client_finished_label,
 584                                 s->method->ssl3_enc->client_finished_label_len);
 585                         if (ret <= 0) goto end;
 586                         s->state=SSL3_ST_CW_FLUSH;
 587
 588                         /* clear flags */
 589                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 590                         if (s->hit)
 591                                 {
 592                                 s->s3->tmp.next_state=SSL_ST_OK;
 593 #ifndef OPENSSL_NO_SCTP
 594                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 595                                         {
 596                                                 s->d1->next_state = s->s3->tmp.next_state;
 597                                                 s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 598                                         }
 599 #endif
 600                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 601                                         {
 602                                         s->state=SSL_ST_OK;
 603 #ifndef OPENSSL_NO_SCTP
 604                                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 605                                                 {
 606                                                         s->d1->next_state = SSL_ST_OK;
 607                                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 608                                                 }
 609 #endif
 610                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 611                                         s->s3->delay_buf_pop_ret=0;
 612                                         }
 613                                 }
 614                         else
 615                                 {
 616 #ifndef OPENSSL_NO_TLSEXT
 617                                 /* Allow NewSessionTicket if ticket expected */
 618                                 if (s->tlsext_ticket_expected)
 619                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 620                                 else
 621 #endif
 622
 623                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 624                                 }
 625                         s->init_num=0;
 626                         break;
 627
 628 #ifndef OPENSSL_NO_TLSEXT
 629                 case SSL3_ST_CR_SESSION_TICKET_A:
 630                 case SSL3_ST_CR_SESSION_TICKET_B:
 631                         ret=ssl3_get_new_session_ticket(s);
 632                         if (ret <= 0) goto end;
 633                         s->state=SSL3_ST_CR_FINISHED_A;
 634                         s->init_num=0;
 635                 break;
 636
 637                 case SSL3_ST_CR_CERT_STATUS_A:
 638                 case SSL3_ST_CR_CERT_STATUS_B:
 639                         ret=ssl3_get_cert_status(s);
 640                         if (ret <= 0) goto end;
 641                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 642                         s->init_num=0;
 643                 break;
 644 #endif
 645
 646                 case SSL3_ST_CR_FINISHED_A:
 647                 case SSL3_ST_CR_FINISHED_B:
 648                         s->d1->change_cipher_spec_ok = 1;
 649                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 650                                 SSL3_ST_CR_FINISHED_B);
 651                         if (ret <= 0) goto end;
 652                         dtls1_stop_timer(s);
 653
 654                         if (s->hit)
 655                                 s->state=SSL3_ST_CW_CHANGE_A;
 656                         else
 657                                 s->state=SSL_ST_OK;
 658
 659 #ifndef OPENSSL_NO_SCTP
 660                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 661                                 state == SSL_ST_RENEGOTIATE)
 662                                 {
 663                                 s->d1->next_state=s->state;
 664                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 665                                 }
 666 #endif
 667
 668                         s->init_num=0;
 669                         break;
 670
 671                 case SSL3_ST_CW_FLUSH:
 672                         s->rwstate=SSL_WRITING;
 673                         if (BIO_flush(s->wbio) <= 0)
 674                                 {
 675                                 /* If the write error was fatal, stop trying */
 676                                 if (!BIO_should_retry(s->wbio))
 677                                         {
 678                                         s->rwstate=SSL_NOTHING;
 679                                         s->state=s->s3->tmp.next_state;
 680                                         }
 681
 682                                 ret= -1;
 683                                 goto end;
 684                                 }
 685                         s->rwstate=SSL_NOTHING;
 686                         s->state=s->s3->tmp.next_state;
 687                         break;
 688
 689                 case SSL_ST_OK:
 690                         /* clean a few things up */
 691                         ssl3_cleanup_key_block(s);
 692
 693 #if 0
 694                         if (s->init_buf != NULL)
 695                                 {
 696                                 BUF_MEM_free(s->init_buf);
 697                                 s->init_buf=NULL;
 698                                 }
 699 #endif
 700
 701                         /* If we are not 'joining' the last two packets,
 702                          * remove the buffering now */
 703                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 704                                 ssl_free_wbio_buffer(s);
 705                         /* else do it later in ssl3_write */
 706
 707                         s->init_num=0;
 708                         s->renegotiate=0;
 709                         s->new_session=0;
 710
 711                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 712                         if (s->hit) s->ctx->stats.sess_hit++;
 713
 714                         ret=1;
 715                         /* s->server=0; */
 716                         s->handshake_func=dtls1_connect;
 717                         s->ctx->stats.sess_connect_good++;
 718
 719                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 720
 721                         /* done with handshaking */
 722                         s->d1->handshake_read_seq  = 0;
 723                         s->d1->next_handshake_write_seq = 0;
 724                         goto end;
 725                         /* break; */
 726
 727                 default:
 728                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 729                         ret= -1;
 730                         goto end;
 731                         /* break; */
 732                         }
 733
 734                 /* did we do anything */
 735                 if (!s->s3->tmp.reuse_message && !skip)
 736                         {
 737                         if (s->debug)
 738                                 {
 739                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 740                                         goto end;
 741                                 }
 742
 743                         if ((cb != NULL) && (s->state != state))
 744                                 {
 745                                 new_state=s->state;
 746                                 s->state=state;
 747                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 748                                 s->state=new_state;
 749                                 }
 750                         }
 751                 skip=0;
 752                 }
 753 end:
 754         s->in_handshake--;
 755
 756 #ifndef OPENSSL_NO_SCTP
 757         /* Notify SCTP BIO socket to leave handshake
 758          * mode and allow stream identifier other
 759          * than 0. Will be ignored if no SCTP is used.
 760          */
 761         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
 762 #endif
 763
 764         if (buf != NULL)
 765                 BUF_MEM_free(buf);
 766         if (cb != NULL)
 767                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 768         return(ret);
 769         }
 770
 771 static int dtls1_get_hello_verify(SSL *s)
 772         {
 773         int n, al, ok = 0;
 774         unsigned char *data;
 775         unsigned int cookie_len;
 776
 777         n=s->method->ssl_get_message(s,
 778                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 779                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 780                 -1,
 781                 s->max_cert_list,
 782                 &ok);
 783
 784         if (!ok) return((int)n);
 785
 786         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 787                 {
 788                 s->d1->send_cookie = 0;
 789                 s->s3->tmp.reuse_message=1;
 790                 return(1);
 791                 }
 792
 793         data = (unsigned char *)s->init_msg;
 794
 795         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 796                 {
 797                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 798                 s->version=(s->version&0xff00)|data[1];
 799                 al = SSL_AD_PROTOCOL_VERSION;
 800                 goto f_err;
 801                 }
 802         data+=2;
 803
 804         cookie_len = *(data++);
 805         if ( cookie_len > sizeof(s->d1->cookie))
 806                 {
 807                 al=SSL_AD_ILLEGAL_PARAMETER;
 808                 goto f_err;
 809                 }
 810
 811         memcpy(s->d1->cookie, data, cookie_len);
 812         s->d1->cookie_len = cookie_len;
 813
 814         s->d1->send_cookie = 1;
 815         return 1;
 816
 817 f_err:
 818         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 819         return -1;
 820         }
 821