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 if (ver == DTLS1_2_VERSION)
 139                 return(DTLSv1_2_client_method());
 140         else
 141                 return(NULL);
 142         }
 143
 144 IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,
 145                         DTLSv1_client_method,
 146                         ssl_undefined_function,
 147                         dtls1_connect,
 148                         dtls1_get_client_method,
 149                         DTLSv1_enc_data)
 150
 151 IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION,
 152                         DTLSv1_2_client_method,
 153                         ssl_undefined_function,
 154                         dtls1_connect,
 155                         dtls1_get_client_method,
 156                         DTLSv1_2_enc_data)
 157
 158 IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION,
 159                         DTLS_client_method,
 160                         ssl_undefined_function,
 161                         dtls1_connect,
 162                         dtls1_get_client_method,
 163                         DTLSv1_2_enc_data)
 164
 165 int dtls1_connect(SSL *s)
 166         {
 167         BUF_MEM *buf=NULL;
 168         unsigned long Time=(unsigned long)time(NULL);
 169         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 170         int ret= -1;
 171         int new_state,state,skip=0;
 172 #ifndef OPENSSL_NO_SCTP
 173         unsigned char sctpauthkey[64];
 174         char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
 175 #endif
 176
 177         RAND_add(&Time,sizeof(Time),0);
 178         ERR_clear_error();
 179         clear_sys_error();
 180
 181         if (s->info_callback != NULL)
 182                 cb=s->info_callback;
 183         else if (s->ctx->info_callback != NULL)
 184                 cb=s->ctx->info_callback;
 185
 186         s->in_handshake++;
 187         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 188
 189 #ifndef OPENSSL_NO_SCTP
 190         /* Notify SCTP BIO socket to enter handshake
 191          * mode and prevent stream identifier other
 192          * than 0. Will be ignored if no SCTP is used.
 193          */
 194         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
 195 #endif
 196
 197 #ifndef OPENSSL_NO_HEARTBEATS
 198         /* If we're awaiting a HeartbeatResponse, pretend we
 199          * already got and don't await it anymore, because
 200          * Heartbeats don't make sense during handshakes anyway.
 201          */
 202         if (s->tlsext_hb_pending)
 203                 {
 204                 dtls1_stop_timer(s);
 205                 s->tlsext_hb_pending = 0;
 206                 s->tlsext_hb_seq++;
 207                 }
 208 #endif
 209
 210         for (;;)
 211                 {
 212                 state=s->state;
 213
 214                 switch(s->state)
 215                         {
 216                 case SSL_ST_RENEGOTIATE:
 217                         s->renegotiate=1;
 218                         s->state=SSL_ST_CONNECT;
 219                         s->ctx->stats.sess_connect_renegotiate++;
 220                         /* break */
 221                 case SSL_ST_BEFORE:
 222                 case SSL_ST_CONNECT:
 223                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 224                 case SSL_ST_OK|SSL_ST_CONNECT:
 225
 226                         s->server=0;
 227                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 228
 229                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
 230                             (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
 231                                 {
 232                                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 233                                 ret = -1;
 234                                 goto end;
 235                                 }
 236
 237                         /* s->version=SSL3_VERSION; */
 238                         s->type=SSL_ST_CONNECT;
 239
 240                         if (s->init_buf == NULL)
 241                                 {
 242                                 if ((buf=BUF_MEM_new()) == NULL)
 243                                         {
 244                                         ret= -1;
 245                                         goto end;
 246                                         }
 247                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 248                                         {
 249                                         ret= -1;
 250                                         goto end;
 251                                         }
 252                                 s->init_buf=buf;
 253                                 buf=NULL;
 254                                 }
 255
 256                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 257
 258                         /* setup buffing BIO */
 259                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 260
 261                         /* don't push the buffering BIO quite yet */
 262
 263                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 264                         s->ctx->stats.sess_connect++;
 265                         s->init_num=0;
 266                         /* mark client_random uninitialized */
 267                         memset(s->s3->client_random,0,sizeof(s->s3->client_random));
 268                         s->d1->send_cookie = 0;
 269                         s->hit = 0;
 270                         s->d1->change_cipher_spec_ok = 0;
 271                         /* Should have been reset by ssl3_get_finished, too. */
 272                         s->s3->change_cipher_spec = 0;
 273                         break;
 274
 275 #ifndef OPENSSL_NO_SCTP
 276                 case DTLS1_SCTP_ST_CR_READ_SOCK:
 277
 278                         if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
 279                         {
 280                                 s->s3->in_read_app_data=2;
 281                                 s->rwstate=SSL_READING;
 282                                 BIO_clear_retry_flags(SSL_get_rbio(s));
 283                                 BIO_set_retry_read(SSL_get_rbio(s));
 284                                 ret = -1;
 285                                 goto end;
 286                         }
 287
 288                         s->state=s->s3->tmp.next_state;
 289                         break;
 290
 291                 case DTLS1_SCTP_ST_CW_WRITE_SOCK:
 292                         /* read app data until dry event */
 293
 294                         ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
 295                         if (ret < 0) goto end;
 296
 297                         if (ret == 0)
 298                         {
 299                                 s->s3->in_read_app_data=2;
 300                                 s->rwstate=SSL_READING;
 301                                 BIO_clear_retry_flags(SSL_get_rbio(s));
 302                                 BIO_set_retry_read(SSL_get_rbio(s));
 303                                 ret = -1;
 304                                 goto end;
 305                         }
 306
 307                         s->state=s->d1->next_state;
 308                         break;
 309 #endif
 310
 311                 case SSL3_ST_CW_CLNT_HELLO_A:
 312                 case SSL3_ST_CW_CLNT_HELLO_B:
 313
 314                         s->shutdown=0;
 315
 316                         /* every DTLS ClientHello resets Finished MAC */
 317                         ssl3_init_finished_mac(s);
 318
 319                         dtls1_start_timer(s);
 320                         ret=ssl3_client_hello(s);
 321                         if (ret <= 0) goto end;
 322
 323                         if ( s->d1->send_cookie)
 324                                 {
 325                                 s->state=SSL3_ST_CW_FLUSH;
 326                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 327                                 }
 328                         else
 329                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 330
 331                         s->init_num=0;
 332
 333 #ifndef OPENSSL_NO_SCTP
 334                         /* Disable buffering for SCTP */
 335                         if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
 336                                 {
 337 #endif
 338                                 /* turn on buffering for the next lot of output */
 339                                 if (s->bbio != s->wbio)
 340                                         s->wbio=BIO_push(s->bbio,s->wbio);
 341 #ifndef OPENSSL_NO_SCTP
 342                                 }
 343 #endif
 344
 345                         break;
 346
 347                 case SSL3_ST_CR_SRVR_HELLO_A:
 348                 case SSL3_ST_CR_SRVR_HELLO_B:
 349                         ret=ssl3_get_server_hello(s);
 350                         if (ret <= 0) goto end;
 351                         else
 352                                 {
 353                                 if (s->hit)
 354                                         {
 355 #ifndef OPENSSL_NO_SCTP
 356                                         /* Add new shared key for SCTP-Auth,
 357                                          * will be ignored if no SCTP used.
 358                                          */
 359                                         snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 360                                                  DTLS1_SCTP_AUTH_LABEL);
 361
 362                                         SSL_export_keying_material(s, sctpauthkey,
 363                                                                    sizeof(sctpauthkey), labelbuffer,
 364                                                                    sizeof(labelbuffer), NULL, 0, 0);
 365
 366                                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 367                                                          sizeof(sctpauthkey), sctpauthkey);
 368 #endif
 369
 370                                         s->state=SSL3_ST_CR_FINISHED_A;
 371                                         }
 372                                 else
 373                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 374                                 }
 375                         s->init_num=0;
 376                         break;
 377
 378                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 379                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 380
 381                         ret = dtls1_get_hello_verify(s);
 382                         if ( ret <= 0)
 383                                 goto end;
 384                         dtls1_stop_timer(s);
 385                         if ( s->d1->send_cookie) /* start again, with a cookie */
 386                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 387                         else
 388                                 s->state = SSL3_ST_CR_CERT_A;
 389                         s->init_num = 0;
 390                         break;
 391
 392                 case SSL3_ST_CR_CERT_A:
 393                 case SSL3_ST_CR_CERT_B:
 394                         /* Check if it is anon DH or PSK */
 395                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 396                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 397                                 {
 398                                 ret=ssl3_get_server_certificate(s);
 399                                 if (ret <= 0) goto end;
 400 #ifndef OPENSSL_NO_TLSEXT
 401                                 if (s->tlsext_status_expected)
 402                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 403                                 else
 404                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 405                                 }
 406                         else
 407                                 {
 408                                 skip = 1;
 409                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 410                                 }
 411 #else
 412                                 }
 413                         else
 414                                 skip=1;
 415
 416                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 417 #endif
 418                         s->init_num=0;
 419                         break;
 420
 421                 case SSL3_ST_CR_KEY_EXCH_A:
 422                 case SSL3_ST_CR_KEY_EXCH_B:
 423                         ret=ssl3_get_key_exchange(s);
 424                         if (ret <= 0) goto end;
 425                         s->state=SSL3_ST_CR_CERT_REQ_A;
 426                         s->init_num=0;
 427
 428                         /* at this point we check that we have the
 429                          * required stuff from the server */
 430                         if (!ssl3_check_cert_and_algorithm(s))
 431                                 {
 432                                 ret= -1;
 433                                 goto end;
 434                                 }
 435                         break;
 436
 437                 case SSL3_ST_CR_CERT_REQ_A:
 438                 case SSL3_ST_CR_CERT_REQ_B:
 439                         ret=ssl3_get_certificate_request(s);
 440                         if (ret <= 0) goto end;
 441                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 442                         s->init_num=0;
 443                         break;
 444
 445                 case SSL3_ST_CR_SRVR_DONE_A:
 446                 case SSL3_ST_CR_SRVR_DONE_B:
 447                         ret=ssl3_get_server_done(s);
 448                         if (ret <= 0) goto end;
 449                         dtls1_stop_timer(s);
 450                         if (s->s3->tmp.cert_req)
 451                                 s->s3->tmp.next_state=SSL3_ST_CW_CERT_A;
 452                         else
 453                                 s->s3->tmp.next_state=SSL3_ST_CW_KEY_EXCH_A;
 454                         s->init_num=0;
 455
 456 #ifndef OPENSSL_NO_SCTP
 457                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 458                             state == SSL_ST_RENEGOTIATE)
 459                                 s->state=DTLS1_SCTP_ST_CR_READ_SOCK;
 460                         else
 461 #endif
 462                         s->state=s->s3->tmp.next_state;
 463                         break;
 464
 465                 case SSL3_ST_CW_CERT_A:
 466                 case SSL3_ST_CW_CERT_B:
 467                 case SSL3_ST_CW_CERT_C:
 468                 case SSL3_ST_CW_CERT_D:
 469                         dtls1_start_timer(s);
 470                         ret=ssl3_send_client_certificate(s);
 471                         if (ret <= 0) goto end;
 472                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 473                         s->init_num=0;
 474                         break;
 475
 476                 case SSL3_ST_CW_KEY_EXCH_A:
 477                 case SSL3_ST_CW_KEY_EXCH_B:
 478                         dtls1_start_timer(s);
 479                         ret=ssl3_send_client_key_exchange(s);
 480                         if (ret <= 0) goto end;
 481
 482 #ifndef OPENSSL_NO_SCTP
 483                         /* Add new shared key for SCTP-Auth,
 484                          * will be ignored if no SCTP used.
 485                          */
 486                         snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 487                                  DTLS1_SCTP_AUTH_LABEL);
 488
 489                         SSL_export_keying_material(s, sctpauthkey,
 490                                                    sizeof(sctpauthkey), labelbuffer,
 491                                                    sizeof(labelbuffer), NULL, 0, 0);
 492
 493                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 494                                          sizeof(sctpauthkey), sctpauthkey);
 495 #endif
 496
 497                         /* EAY EAY EAY need to check for DH fix cert
 498                          * sent back */
 499                         /* For TLS, cert_req is set to 2, so a cert chain
 500                          * of nothing is sent, but no verify packet is sent */
 501                         if (s->s3->tmp.cert_req == 1)
 502                                 {
 503                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 504                                 }
 505                         else
 506                                 {
 507 #ifndef OPENSSL_NO_SCTP
 508                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 509                                         {
 510                                         s->d1->next_state=SSL3_ST_CW_CHANGE_A;
 511                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 512                                         }
 513                                 else
 514 #endif
 515                                         s->state=SSL3_ST_CW_CHANGE_A;
 516                                 }
 517
 518                         s->init_num=0;
 519                         break;
 520
 521                 case SSL3_ST_CW_CERT_VRFY_A:
 522                 case SSL3_ST_CW_CERT_VRFY_B:
 523                         dtls1_start_timer(s);
 524                         ret=ssl3_send_client_verify(s);
 525                         if (ret <= 0) goto end;
 526 #ifndef OPENSSL_NO_SCTP
 527                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 528                         {
 529                                 s->d1->next_state=SSL3_ST_CW_CHANGE_A;
 530                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 531                         }
 532                         else
 533 #endif
 534                                 s->state=SSL3_ST_CW_CHANGE_A;
 535                         s->init_num=0;
 536                         break;
 537
 538                 case SSL3_ST_CW_CHANGE_A:
 539                 case SSL3_ST_CW_CHANGE_B:
 540                         if (!s->hit)
 541                                 dtls1_start_timer(s);
 542                         ret=dtls1_send_change_cipher_spec(s,
 543                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 544                         if (ret <= 0) goto end;
 545
 546                         s->state=SSL3_ST_CW_FINISHED_A;
 547                         s->init_num=0;
 548
 549                         s->session->cipher=s->s3->tmp.new_cipher;
 550 #ifdef OPENSSL_NO_COMP
 551                         s->session->compress_meth=0;
 552 #else
 553                         if (s->s3->tmp.new_compression == NULL)
 554                                 s->session->compress_meth=0;
 555                         else
 556                                 s->session->compress_meth=
 557                                         s->s3->tmp.new_compression->id;
 558 #endif
 559                         if (!s->method->ssl3_enc->setup_key_block(s))
 560                                 {
 561                                 ret= -1;
 562                                 goto end;
 563                                 }
 564
 565                         if (!s->method->ssl3_enc->change_cipher_state(s,
 566                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 567                                 {
 568                                 ret= -1;
 569                                 goto end;
 570                                 }
 571
 572 #ifndef OPENSSL_NO_SCTP
 573                                 if (s->hit)
 574                                         {
 575                                         /* Change to new shared key of SCTP-Auth,
 576                                          * will be ignored if no SCTP used.
 577                                          */
 578                                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
 579                                         }
 580 #endif
 581
 582                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 583                         break;
 584
 585                 case SSL3_ST_CW_FINISHED_A:
 586                 case SSL3_ST_CW_FINISHED_B:
 587                         if (!s->hit)
 588                                 dtls1_start_timer(s);
 589                         ret=ssl3_send_finished(s,
 590                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 591                                 s->method->ssl3_enc->client_finished_label,
 592                                 s->method->ssl3_enc->client_finished_label_len);
 593                         if (ret <= 0) goto end;
 594                         s->state=SSL3_ST_CW_FLUSH;
 595
 596                         /* clear flags */
 597                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 598                         if (s->hit)
 599                                 {
 600                                 s->s3->tmp.next_state=SSL_ST_OK;
 601 #ifndef OPENSSL_NO_SCTP
 602                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 603                                         {
 604                                                 s->d1->next_state = s->s3->tmp.next_state;
 605                                                 s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 606                                         }
 607 #endif
 608                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 609                                         {
 610                                         s->state=SSL_ST_OK;
 611 #ifndef OPENSSL_NO_SCTP
 612                                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 613                                                 {
 614                                                         s->d1->next_state = SSL_ST_OK;
 615                                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 616                                                 }
 617 #endif
 618                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 619                                         s->s3->delay_buf_pop_ret=0;
 620                                         }
 621                                 }
 622                         else
 623                                 {
 624 #ifndef OPENSSL_NO_SCTP
 625                                 /* Change to new shared key of SCTP-Auth,
 626                                  * will be ignored if no SCTP used.
 627                                  */
 628                                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
 629 #endif
 630
 631 #ifndef OPENSSL_NO_TLSEXT
 632                                 /* Allow NewSessionTicket if ticket expected */
 633                                 if (s->tlsext_ticket_expected)
 634                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 635                                 else
 636 #endif
 637
 638                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 639                                 }
 640                         s->init_num=0;
 641                         break;
 642
 643 #ifndef OPENSSL_NO_TLSEXT
 644                 case SSL3_ST_CR_SESSION_TICKET_A:
 645                 case SSL3_ST_CR_SESSION_TICKET_B:
 646                         ret=ssl3_get_new_session_ticket(s);
 647                         if (ret <= 0) goto end;
 648                         s->state=SSL3_ST_CR_FINISHED_A;
 649                         s->init_num=0;
 650                 break;
 651
 652                 case SSL3_ST_CR_CERT_STATUS_A:
 653                 case SSL3_ST_CR_CERT_STATUS_B:
 654                         ret=ssl3_get_cert_status(s);
 655                         if (ret <= 0) goto end;
 656                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 657                         s->init_num=0;
 658                 break;
 659 #endif
 660
 661                 case SSL3_ST_CR_FINISHED_A:
 662                 case SSL3_ST_CR_FINISHED_B:
 663                         s->d1->change_cipher_spec_ok = 1;
 664                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 665                                 SSL3_ST_CR_FINISHED_B);
 666                         if (ret <= 0) goto end;
 667                         dtls1_stop_timer(s);
 668
 669                         if (s->hit)
 670                                 s->state=SSL3_ST_CW_CHANGE_A;
 671                         else
 672                                 s->state=SSL_ST_OK;
 673
 674 #ifndef OPENSSL_NO_SCTP
 675                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 676                                 state == SSL_ST_RENEGOTIATE)
 677                                 {
 678                                 s->d1->next_state=s->state;
 679                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 680                                 }
 681 #endif
 682
 683                         s->init_num=0;
 684                         break;
 685
 686                 case SSL3_ST_CW_FLUSH:
 687                         s->rwstate=SSL_WRITING;
 688                         if (BIO_flush(s->wbio) <= 0)
 689                                 {
 690                                 /* If the write error was fatal, stop trying */
 691                                 if (!BIO_should_retry(s->wbio))
 692                                         {
 693                                         s->rwstate=SSL_NOTHING;
 694                                         s->state=s->s3->tmp.next_state;
 695                                         }
 696
 697                                 ret= -1;
 698                                 goto end;
 699                                 }
 700                         s->rwstate=SSL_NOTHING;
 701                         s->state=s->s3->tmp.next_state;
 702                         break;
 703
 704                 case SSL_ST_OK:
 705                         /* clean a few things up */
 706                         ssl3_cleanup_key_block(s);
 707
 708 #if 0
 709                         if (s->init_buf != NULL)
 710                                 {
 711                                 BUF_MEM_free(s->init_buf);
 712                                 s->init_buf=NULL;
 713                                 }
 714 #endif
 715
 716                         /* If we are not 'joining' the last two packets,
 717                          * remove the buffering now */
 718                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 719                                 ssl_free_wbio_buffer(s);
 720                         /* else do it later in ssl3_write */
 721
 722                         s->init_num=0;
 723                         s->renegotiate=0;
 724                         s->new_session=0;
 725
 726                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 727                         if (s->hit) s->ctx->stats.sess_hit++;
 728
 729                         ret=1;
 730                         /* s->server=0; */
 731                         s->handshake_func=dtls1_connect;
 732                         s->ctx->stats.sess_connect_good++;
 733
 734                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 735
 736                         /* done with handshaking */
 737                         s->d1->handshake_read_seq  = 0;
 738                         s->d1->next_handshake_write_seq = 0;
 739                         goto end;
 740                         /* break; */
 741
 742                 default:
 743                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 744                         ret= -1;
 745                         goto end;
 746                         /* break; */
 747                         }
 748
 749                 /* did we do anything */
 750                 if (!s->s3->tmp.reuse_message && !skip)
 751                         {
 752                         if (s->debug)
 753                                 {
 754                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 755                                         goto end;
 756                                 }
 757
 758                         if ((cb != NULL) && (s->state != state))
 759                                 {
 760                                 new_state=s->state;
 761                                 s->state=state;
 762                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 763                                 s->state=new_state;
 764                                 }
 765                         }
 766                 skip=0;
 767                 }
 768 end:
 769         s->in_handshake--;
 770
 771 #ifndef OPENSSL_NO_SCTP
 772         /* Notify SCTP BIO socket to leave handshake
 773          * mode and allow stream identifier other
 774          * than 0. Will be ignored if no SCTP is used.
 775          */
 776         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
 777 #endif
 778
 779         if (buf != NULL)
 780                 BUF_MEM_free(buf);
 781         if (cb != NULL)
 782                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 783         return(ret);
 784         }
 785
 786 static int dtls1_get_hello_verify(SSL *s)
 787         {
 788         int n, al, ok = 0;
 789         unsigned char *data;
 790         unsigned int cookie_len;
 791
 792         s->first_packet = 1;
 793         n=s->method->ssl_get_message(s,
 794                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 795                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 796                 -1,
 797                 s->max_cert_list,
 798                 &ok);
 799         s->first_packet = 0;
 800
 801         if (!ok) return((int)n);
 802
 803         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 804                 {
 805                 s->d1->send_cookie = 0;
 806                 s->s3->tmp.reuse_message=1;
 807                 return(1);
 808                 }
 809
 810         data = (unsigned char *)s->init_msg;
 811 #if 0
 812         if (s->method->version != DTLS_ANY_VERSION &&
 813                 ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff))))
 814                 {
 815                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 816                 s->version=(s->version&0xff00)|data[1];
 817                 al = SSL_AD_PROTOCOL_VERSION;
 818                 goto f_err;
 819                 }
 820 #endif
 821         data+=2;
 822
 823         cookie_len = *(data++);
 824         if ( cookie_len > sizeof(s->d1->cookie))
 825                 {
 826                 al=SSL_AD_ILLEGAL_PARAMETER;
 827                 goto f_err;
 828                 }
 829
 830         memcpy(s->d1->cookie, data, cookie_len);
 831         s->d1->cookie_len = cookie_len;
 832
 833         s->d1->send_cookie = 1;
 834         return 1;
 835
 836 f_err:
 837         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 838         return -1;
 839         }