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 int dtls1_connect(SSL *s)
 159         {
 160         BUF_MEM *buf=NULL;
 161         unsigned long Time=(unsigned long)time(NULL);
 162         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 163         int ret= -1;
 164         int new_state,state,skip=0;
 165 #ifndef OPENSSL_NO_SCTP
 166         unsigned char sctpauthkey[64];
 167         char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
 168 #endif
 169
 170         RAND_add(&Time,sizeof(Time),0);
 171         ERR_clear_error();
 172         clear_sys_error();
 173
 174         if (s->info_callback != NULL)
 175                 cb=s->info_callback;
 176         else if (s->ctx->info_callback != NULL)
 177                 cb=s->ctx->info_callback;
 178
 179         s->in_handshake++;
 180         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 181
 182 #ifndef OPENSSL_NO_SCTP
 183         /* Notify SCTP BIO socket to enter handshake
 184          * mode and prevent stream identifier other
 185          * than 0. Will be ignored if no SCTP is used.
 186          */
 187         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
 188 #endif
 189
 190 #ifndef OPENSSL_NO_HEARTBEATS
 191         /* If we're awaiting a HeartbeatResponse, pretend we
 192          * already got and don't await it anymore, because
 193          * Heartbeats don't make sense during handshakes anyway.
 194          */
 195         if (s->tlsext_hb_pending)
 196                 {
 197                 dtls1_stop_timer(s);
 198                 s->tlsext_hb_pending = 0;
 199                 s->tlsext_hb_seq++;
 200                 }
 201 #endif
 202
 203         for (;;)
 204                 {
 205                 state=s->state;
 206
 207                 switch(s->state)
 208                         {
 209                 case SSL_ST_RENEGOTIATE:
 210                         s->renegotiate=1;
 211                         s->state=SSL_ST_CONNECT;
 212                         s->ctx->stats.sess_connect_renegotiate++;
 213                         /* break */
 214                 case SSL_ST_BEFORE:
 215                 case SSL_ST_CONNECT:
 216                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 217                 case SSL_ST_OK|SSL_ST_CONNECT:
 218
 219                         s->server=0;
 220                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 221
 222                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
 223                             (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
 224                                 {
 225                                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 226                                 ret = -1;
 227                                 goto end;
 228                                 }
 229
 230                         /* s->version=SSL3_VERSION; */
 231                         s->type=SSL_ST_CONNECT;
 232
 233                         if (s->init_buf == NULL)
 234                                 {
 235                                 if ((buf=BUF_MEM_new()) == NULL)
 236                                         {
 237                                         ret= -1;
 238                                         goto end;
 239                                         }
 240                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 241                                         {
 242                                         ret= -1;
 243                                         goto end;
 244                                         }
 245                                 s->init_buf=buf;
 246                                 buf=NULL;
 247                                 }
 248
 249                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 250
 251                         /* setup buffing BIO */
 252                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 253
 254                         /* don't push the buffering BIO quite yet */
 255
 256                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 257                         s->ctx->stats.sess_connect++;
 258                         s->init_num=0;
 259                         /* mark client_random uninitialized */
 260                         memset(s->s3->client_random,0,sizeof(s->s3->client_random));
 261                         s->d1->send_cookie = 0;
 262                         s->hit = 0;
 263                         break;
 264
 265 #ifndef OPENSSL_NO_SCTP
 266                 case DTLS1_SCTP_ST_CR_READ_SOCK:
 267
 268                         if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
 269                         {
 270                                 s->s3->in_read_app_data=2;
 271                                 s->rwstate=SSL_READING;
 272                                 BIO_clear_retry_flags(SSL_get_rbio(s));
 273                                 BIO_set_retry_read(SSL_get_rbio(s));
 274                                 ret = -1;
 275                                 goto end;
 276                         }
 277
 278                         s->state=s->s3->tmp.next_state;
 279                         break;
 280
 281                 case DTLS1_SCTP_ST_CW_WRITE_SOCK:
 282                         /* read app data until dry event */
 283
 284                         ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
 285                         if (ret < 0) goto end;
 286
 287                         if (ret == 0)
 288                         {
 289                                 s->s3->in_read_app_data=2;
 290                                 s->rwstate=SSL_READING;
 291                                 BIO_clear_retry_flags(SSL_get_rbio(s));
 292                                 BIO_set_retry_read(SSL_get_rbio(s));
 293                                 ret = -1;
 294                                 goto end;
 295                         }
 296
 297                         s->state=s->d1->next_state;
 298                         break;
 299 #endif
 300
 301                 case SSL3_ST_CW_CLNT_HELLO_A:
 302                 case SSL3_ST_CW_CLNT_HELLO_B:
 303
 304                         s->shutdown=0;
 305
 306                         /* every DTLS ClientHello resets Finished MAC */
 307                         ssl3_init_finished_mac(s);
 308
 309                         dtls1_start_timer(s);
 310                         ret=ssl3_client_hello(s);
 311                         if (ret <= 0) goto end;
 312
 313                         if ( s->d1->send_cookie)
 314                                 {
 315                                 s->state=SSL3_ST_CW_FLUSH;
 316                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 317                                 }
 318                         else
 319                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 320
 321                         s->init_num=0;
 322
 323 #ifndef OPENSSL_NO_SCTP
 324                         /* Disable buffering for SCTP */
 325                         if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
 326                                 {
 327 #endif
 328                                 /* turn on buffering for the next lot of output */
 329                                 if (s->bbio != s->wbio)
 330                                         s->wbio=BIO_push(s->bbio,s->wbio);
 331 #ifndef OPENSSL_NO_SCTP
 332                                 }
 333 #endif
 334
 335                         break;
 336
 337                 case SSL3_ST_CR_SRVR_HELLO_A:
 338                 case SSL3_ST_CR_SRVR_HELLO_B:
 339                         ret=ssl3_get_server_hello(s);
 340                         if (ret <= 0) goto end;
 341                         else
 342                                 {
 343                                 if (s->hit)
 344                                         {
 345 #ifndef OPENSSL_NO_SCTP
 346                                         /* Add new shared key for SCTP-Auth,
 347                                          * will be ignored if no SCTP used.
 348                                          */
 349                                         snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 350                                                  DTLS1_SCTP_AUTH_LABEL);
 351
 352                                         SSL_export_keying_material(s, sctpauthkey,
 353                                                                    sizeof(sctpauthkey), labelbuffer,
 354                                                                    sizeof(labelbuffer), NULL, 0, 0);
 355
 356                                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 357                                                          sizeof(sctpauthkey), sctpauthkey);
 358 #endif
 359
 360                                         s->state=SSL3_ST_CR_FINISHED_A;
 361                                         }
 362                                 else
 363                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 364                                 }
 365                         s->init_num=0;
 366                         break;
 367
 368                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 369                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 370
 371                         ret = dtls1_get_hello_verify(s);
 372                         if ( ret <= 0)
 373                                 goto end;
 374                         dtls1_stop_timer(s);
 375                         if ( s->d1->send_cookie) /* start again, with a cookie */
 376                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 377                         else
 378                                 s->state = SSL3_ST_CR_CERT_A;
 379                         s->init_num = 0;
 380                         break;
 381
 382                 case SSL3_ST_CR_CERT_A:
 383                 case SSL3_ST_CR_CERT_B:
 384 #ifndef OPENSSL_NO_TLSEXT
 385                         ret=ssl3_check_finished(s);
 386                         if (ret <= 0) goto end;
 387                         if (ret == 2)
 388                                 {
 389                                 s->hit = 1;
 390                                 if (s->tlsext_ticket_expected)
 391                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 392                                 else
 393                                         s->state=SSL3_ST_CR_FINISHED_A;
 394                                 s->init_num=0;
 395                                 break;
 396                                 }
 397 #endif
 398                         /* Check if it is anon DH or PSK */
 399                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 400                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 401                                 {
 402                                 ret=ssl3_get_server_certificate(s);
 403                                 if (ret <= 0) goto end;
 404 #ifndef OPENSSL_NO_TLSEXT
 405                                 if (s->tlsext_status_expected)
 406                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 407                                 else
 408                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 409                                 }
 410                         else
 411                                 {
 412                                 skip = 1;
 413                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 414                                 }
 415 #else
 416                                 }
 417                         else
 418                                 skip=1;
 419
 420                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 421 #endif
 422                         s->init_num=0;
 423                         break;
 424
 425                 case SSL3_ST_CR_KEY_EXCH_A:
 426                 case SSL3_ST_CR_KEY_EXCH_B:
 427                         ret=ssl3_get_key_exchange(s);
 428                         if (ret <= 0) goto end;
 429                         s->state=SSL3_ST_CR_CERT_REQ_A;
 430                         s->init_num=0;
 431
 432                         /* at this point we check that we have the
 433                          * required stuff from the server */
 434                         if (!ssl3_check_cert_and_algorithm(s))
 435                                 {
 436                                 ret= -1;
 437                                 goto end;
 438                                 }
 439                         break;
 440
 441                 case SSL3_ST_CR_CERT_REQ_A:
 442                 case SSL3_ST_CR_CERT_REQ_B:
 443                         ret=ssl3_get_certificate_request(s);
 444                         if (ret <= 0) goto end;
 445                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 446                         s->init_num=0;
 447                         break;
 448
 449                 case SSL3_ST_CR_SRVR_DONE_A:
 450                 case SSL3_ST_CR_SRVR_DONE_B:
 451                         ret=ssl3_get_server_done(s);
 452                         if (ret <= 0) goto end;
 453                         dtls1_stop_timer(s);
 454                         if (s->s3->tmp.cert_req)
 455                                 s->s3->tmp.next_state=SSL3_ST_CW_CERT_A;
 456                         else
 457                                 s->s3->tmp.next_state=SSL3_ST_CW_KEY_EXCH_A;
 458                         s->init_num=0;
 459
 460 #ifndef OPENSSL_NO_SCTP
 461                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 462                             state == SSL_ST_RENEGOTIATE)
 463                                 s->state=DTLS1_SCTP_ST_CR_READ_SOCK;
 464                         else
 465 #endif
 466                         s->state=s->s3->tmp.next_state;
 467                         break;
 468
 469                 case SSL3_ST_CW_CERT_A:
 470                 case SSL3_ST_CW_CERT_B:
 471                 case SSL3_ST_CW_CERT_C:
 472                 case SSL3_ST_CW_CERT_D:
 473                         dtls1_start_timer(s);
 474                         ret=ssl3_send_client_certificate(s);
 475                         if (ret <= 0) goto end;
 476                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 477                         s->init_num=0;
 478                         break;
 479
 480                 case SSL3_ST_CW_KEY_EXCH_A:
 481                 case SSL3_ST_CW_KEY_EXCH_B:
 482                         dtls1_start_timer(s);
 483                         ret=ssl3_send_client_key_exchange(s);
 484                         if (ret <= 0) goto end;
 485
 486 #ifndef OPENSSL_NO_SCTP
 487                         /* Add new shared key for SCTP-Auth,
 488                          * will be ignored if no SCTP used.
 489                          */
 490                         snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 491                                  DTLS1_SCTP_AUTH_LABEL);
 492
 493                         SSL_export_keying_material(s, sctpauthkey,
 494                                                    sizeof(sctpauthkey), labelbuffer,
 495                                                    sizeof(labelbuffer), NULL, 0, 0);
 496
 497                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 498                                          sizeof(sctpauthkey), sctpauthkey);
 499 #endif
 500
 501                         /* EAY EAY EAY need to check for DH fix cert
 502                          * sent back */
 503                         /* For TLS, cert_req is set to 2, so a cert chain
 504                          * of nothing is sent, but no verify packet is sent */
 505                         if (s->s3->tmp.cert_req == 1)
 506                                 {
 507                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 508                                 }
 509                         else
 510                                 {
 511 #ifndef OPENSSL_NO_SCTP
 512                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 513                                         {
 514                                         s->d1->next_state=SSL3_ST_CW_CHANGE_A;
 515                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 516                                         }
 517                                 else
 518 #endif
 519                                         s->state=SSL3_ST_CW_CHANGE_A;
 520                                 s->s3->change_cipher_spec=0;
 521                                 }
 522
 523                         s->init_num=0;
 524                         break;
 525
 526                 case SSL3_ST_CW_CERT_VRFY_A:
 527                 case SSL3_ST_CW_CERT_VRFY_B:
 528                         dtls1_start_timer(s);
 529                         ret=ssl3_send_client_verify(s);
 530                         if (ret <= 0) goto end;
 531 #ifndef OPENSSL_NO_SCTP
 532                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 533                         {
 534                                 s->d1->next_state=SSL3_ST_CW_CHANGE_A;
 535                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 536                         }
 537                         else
 538 #endif
 539                                 s->state=SSL3_ST_CW_CHANGE_A;
 540                         s->init_num=0;
 541                         s->s3->change_cipher_spec=0;
 542                         break;
 543
 544                 case SSL3_ST_CW_CHANGE_A:
 545                 case SSL3_ST_CW_CHANGE_B:
 546                         if (!s->hit)
 547                                 dtls1_start_timer(s);
 548                         ret=dtls1_send_change_cipher_spec(s,
 549                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 550                         if (ret <= 0) goto end;
 551
 552 #ifndef OPENSSL_NO_SCTP
 553                         /* Change to new shared key of SCTP-Auth,
 554                          * will be ignored if no SCTP used.
 555                          */
 556                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
 557 #endif
 558
 559                         s->state=SSL3_ST_CW_FINISHED_A;
 560                         s->init_num=0;
 561
 562                         s->session->cipher=s->s3->tmp.new_cipher;
 563 #ifdef OPENSSL_NO_COMP
 564                         s->session->compress_meth=0;
 565 #else
 566                         if (s->s3->tmp.new_compression == NULL)
 567                                 s->session->compress_meth=0;
 568                         else
 569                                 s->session->compress_meth=
 570                                         s->s3->tmp.new_compression->id;
 571 #endif
 572                         if (!s->method->ssl3_enc->setup_key_block(s))
 573                                 {
 574                                 ret= -1;
 575                                 goto end;
 576                                 }
 577
 578                         if (!s->method->ssl3_enc->change_cipher_state(s,
 579                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 580                                 {
 581                                 ret= -1;
 582                                 goto end;
 583                                 }
 584
 585                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 586                         break;
 587
 588                 case SSL3_ST_CW_FINISHED_A:
 589                 case SSL3_ST_CW_FINISHED_B:
 590                         if (!s->hit)
 591                                 dtls1_start_timer(s);
 592                         ret=ssl3_send_finished(s,
 593                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 594                                 s->method->ssl3_enc->client_finished_label,
 595                                 s->method->ssl3_enc->client_finished_label_len);
 596                         if (ret <= 0) goto end;
 597                         s->state=SSL3_ST_CW_FLUSH;
 598
 599                         /* clear flags */
 600                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 601                         if (s->hit)
 602                                 {
 603                                 s->s3->tmp.next_state=SSL_ST_OK;
 604 #ifndef OPENSSL_NO_SCTP
 605                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 606                                         {
 607                                                 s->d1->next_state = s->s3->tmp.next_state;
 608                                                 s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 609                                         }
 610 #endif
 611                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 612                                         {
 613                                         s->state=SSL_ST_OK;
 614 #ifndef OPENSSL_NO_SCTP
 615                                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 616                                                 {
 617                                                         s->d1->next_state = SSL_ST_OK;
 618                                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 619                                                 }
 620 #endif
 621                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 622                                         s->s3->delay_buf_pop_ret=0;
 623                                         }
 624                                 }
 625                         else
 626                                 {
 627 #ifndef OPENSSL_NO_TLSEXT
 628                                 /* Allow NewSessionTicket if ticket expected */
 629                                 if (s->tlsext_ticket_expected)
 630                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 631                                 else
 632 #endif
 633
 634                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 635                                 }
 636                         s->init_num=0;
 637                         break;
 638
 639 #ifndef OPENSSL_NO_TLSEXT
 640                 case SSL3_ST_CR_SESSION_TICKET_A:
 641                 case SSL3_ST_CR_SESSION_TICKET_B:
 642                         ret=ssl3_get_new_session_ticket(s);
 643                         if (ret <= 0) goto end;
 644                         s->state=SSL3_ST_CR_FINISHED_A;
 645                         s->init_num=0;
 646                 break;
 647
 648                 case SSL3_ST_CR_CERT_STATUS_A:
 649                 case SSL3_ST_CR_CERT_STATUS_B:
 650                         ret=ssl3_get_cert_status(s);
 651                         if (ret <= 0) goto end;
 652                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 653                         s->init_num=0;
 654                 break;
 655 #endif
 656
 657                 case SSL3_ST_CR_FINISHED_A:
 658                 case SSL3_ST_CR_FINISHED_B:
 659                         s->d1->change_cipher_spec_ok = 1;
 660                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 661                                 SSL3_ST_CR_FINISHED_B);
 662                         if (ret <= 0) goto end;
 663                         dtls1_stop_timer(s);
 664
 665                         if (s->hit)
 666                                 s->state=SSL3_ST_CW_CHANGE_A;
 667                         else
 668                                 s->state=SSL_ST_OK;
 669
 670 #ifndef OPENSSL_NO_SCTP
 671                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 672                                 state == SSL_ST_RENEGOTIATE)
 673                                 {
 674                                 s->d1->next_state=s->state;
 675                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 676                                 }
 677 #endif
 678
 679                         s->init_num=0;
 680                         break;
 681
 682                 case SSL3_ST_CW_FLUSH:
 683                         s->rwstate=SSL_WRITING;
 684                         if (BIO_flush(s->wbio) <= 0)
 685                                 {
 686                                 /* If the write error was fatal, stop trying */
 687                                 if (!BIO_should_retry(s->wbio))
 688                                         {
 689                                         s->rwstate=SSL_NOTHING;
 690                                         s->state=s->s3->tmp.next_state;
 691                                         }
 692
 693                                 ret= -1;
 694                                 goto end;
 695                                 }
 696                         s->rwstate=SSL_NOTHING;
 697                         s->state=s->s3->tmp.next_state;
 698                         break;
 699
 700                 case SSL_ST_OK:
 701                         /* clean a few things up */
 702                         ssl3_cleanup_key_block(s);
 703
 704 #if 0
 705                         if (s->init_buf != NULL)
 706                                 {
 707                                 BUF_MEM_free(s->init_buf);
 708                                 s->init_buf=NULL;
 709                                 }
 710 #endif
 711
 712                         /* If we are not 'joining' the last two packets,
 713                          * remove the buffering now */
 714                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 715                                 ssl_free_wbio_buffer(s);
 716                         /* else do it later in ssl3_write */
 717
 718                         s->init_num=0;
 719                         s->renegotiate=0;
 720                         s->new_session=0;
 721
 722                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 723                         if (s->hit) s->ctx->stats.sess_hit++;
 724
 725                         ret=1;
 726                         /* s->server=0; */
 727                         s->handshake_func=dtls1_connect;
 728                         s->ctx->stats.sess_connect_good++;
 729
 730                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 731
 732                         /* done with handshaking */
 733                         s->d1->handshake_read_seq  = 0;
 734                         s->d1->next_handshake_write_seq = 0;
 735                         goto end;
 736                         /* break; */
 737
 738                 default:
 739                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 740                         ret= -1;
 741                         goto end;
 742                         /* break; */
 743                         }
 744
 745                 /* did we do anything */
 746                 if (!s->s3->tmp.reuse_message && !skip)
 747                         {
 748                         if (s->debug)
 749                                 {
 750                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 751                                         goto end;
 752                                 }
 753
 754                         if ((cb != NULL) && (s->state != state))
 755                                 {
 756                                 new_state=s->state;
 757                                 s->state=state;
 758                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 759                                 s->state=new_state;
 760                                 }
 761                         }
 762                 skip=0;
 763                 }
 764 end:
 765         s->in_handshake--;
 766
 767 #ifndef OPENSSL_NO_SCTP
 768         /* Notify SCTP BIO socket to leave handshake
 769          * mode and allow stream identifier other
 770          * than 0. Will be ignored if no SCTP is used.
 771          */
 772         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
 773 #endif
 774
 775         if (buf != NULL)
 776                 BUF_MEM_free(buf);
 777         if (cb != NULL)
 778                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 779         return(ret);
 780         }
 781
 782 static int dtls1_get_hello_verify(SSL *s)
 783         {
 784         int n, al, ok = 0;
 785         unsigned char *data;
 786         unsigned int cookie_len;
 787
 788         n=s->method->ssl_get_message(s,
 789                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 790                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 791                 -1,
 792                 s->max_cert_list,
 793                 &ok);
 794
 795         if (!ok) return((int)n);
 796
 797         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 798                 {
 799                 s->d1->send_cookie = 0;
 800                 s->s3->tmp.reuse_message=1;
 801                 return(1);
 802                 }
 803
 804         data = (unsigned char *)s->init_msg;
 805
 806         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 807                 {
 808                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 809                 s->version=(s->version&0xff00)|data[1];
 810                 al = SSL_AD_PROTOCOL_VERSION;
 811                 goto f_err;
 812                 }
 813         data+=2;
 814
 815         cookie_len = *(data++);
 816         if ( cookie_len > sizeof(s->d1->cookie))
 817                 {
 818                 al=SSL_AD_ILLEGAL_PARAMETER;
 819                 goto f_err;
 820                 }
 821
 822         memcpy(s->d1->cookie, data, cookie_len);
 823         s->d1->cookie_len = cookie_len;
 824
 825         s->d1->send_cookie = 1;
 826         return 1;
 827
 828 f_err:
 829         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 830         return -1;
 831         }
 832