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                         break;
 271
 272 #ifndef OPENSSL_NO_SCTP
 273                 case DTLS1_SCTP_ST_CR_READ_SOCK:
 274
 275                         if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
 276                         {
 277                                 s->s3->in_read_app_data=2;
 278                                 s->rwstate=SSL_READING;
 279                                 BIO_clear_retry_flags(SSL_get_rbio(s));
 280                                 BIO_set_retry_read(SSL_get_rbio(s));
 281                                 ret = -1;
 282                                 goto end;
 283                         }
 284
 285                         s->state=s->s3->tmp.next_state;
 286                         break;
 287
 288                 case DTLS1_SCTP_ST_CW_WRITE_SOCK:
 289                         /* read app data until dry event */
 290
 291                         ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
 292                         if (ret < 0) goto end;
 293
 294                         if (ret == 0)
 295                         {
 296                                 s->s3->in_read_app_data=2;
 297                                 s->rwstate=SSL_READING;
 298                                 BIO_clear_retry_flags(SSL_get_rbio(s));
 299                                 BIO_set_retry_read(SSL_get_rbio(s));
 300                                 ret = -1;
 301                                 goto end;
 302                         }
 303
 304                         s->state=s->d1->next_state;
 305                         break;
 306 #endif
 307
 308                 case SSL3_ST_CW_CLNT_HELLO_A:
 309                 case SSL3_ST_CW_CLNT_HELLO_B:
 310
 311                         s->shutdown=0;
 312
 313                         /* every DTLS ClientHello resets Finished MAC */
 314                         ssl3_init_finished_mac(s);
 315
 316                         dtls1_start_timer(s);
 317                         ret=ssl3_client_hello(s);
 318                         if (ret <= 0) goto end;
 319
 320                         if ( s->d1->send_cookie)
 321                                 {
 322                                 s->state=SSL3_ST_CW_FLUSH;
 323                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 324                                 }
 325                         else
 326                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 327
 328                         s->init_num=0;
 329
 330 #ifndef OPENSSL_NO_SCTP
 331                         /* Disable buffering for SCTP */
 332                         if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
 333                                 {
 334 #endif
 335                                 /* turn on buffering for the next lot of output */
 336                                 if (s->bbio != s->wbio)
 337                                         s->wbio=BIO_push(s->bbio,s->wbio);
 338 #ifndef OPENSSL_NO_SCTP
 339                                 }
 340 #endif
 341
 342                         break;
 343
 344                 case SSL3_ST_CR_SRVR_HELLO_A:
 345                 case SSL3_ST_CR_SRVR_HELLO_B:
 346                         ret=ssl3_get_server_hello(s);
 347                         if (ret <= 0) goto end;
 348                         else
 349                                 {
 350                                 if (s->hit)
 351                                         {
 352 #ifndef OPENSSL_NO_SCTP
 353                                         /* Add new shared key for SCTP-Auth,
 354                                          * will be ignored if no SCTP used.
 355                                          */
 356                                         snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 357                                                  DTLS1_SCTP_AUTH_LABEL);
 358
 359                                         SSL_export_keying_material(s, sctpauthkey,
 360                                                                    sizeof(sctpauthkey), labelbuffer,
 361                                                                    sizeof(labelbuffer), NULL, 0, 0);
 362
 363                                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 364                                                          sizeof(sctpauthkey), sctpauthkey);
 365 #endif
 366
 367                                         s->state=SSL3_ST_CR_FINISHED_A;
 368                                         }
 369                                 else
 370                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 371                                 }
 372                         s->init_num=0;
 373                         break;
 374
 375                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 376                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 377
 378                         ret = dtls1_get_hello_verify(s);
 379                         if ( ret <= 0)
 380                                 goto end;
 381                         dtls1_stop_timer(s);
 382                         if ( s->d1->send_cookie) /* start again, with a cookie */
 383                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 384                         else
 385                                 s->state = SSL3_ST_CR_CERT_A;
 386                         s->init_num = 0;
 387                         break;
 388
 389                 case SSL3_ST_CR_CERT_A:
 390                 case SSL3_ST_CR_CERT_B:
 391 #ifndef OPENSSL_NO_TLSEXT
 392                         ret=ssl3_check_finished(s);
 393                         if (ret <= 0) goto end;
 394                         if (ret == 2)
 395                                 {
 396                                 s->hit = 1;
 397                                 if (s->tlsext_ticket_expected)
 398                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 399                                 else
 400                                         s->state=SSL3_ST_CR_FINISHED_A;
 401                                 s->init_num=0;
 402                                 break;
 403                                 }
 404 #endif
 405                         /* Check if it is anon DH or PSK */
 406                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 407                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 408                                 {
 409                                 ret=ssl3_get_server_certificate(s);
 410                                 if (ret <= 0) goto end;
 411 #ifndef OPENSSL_NO_TLSEXT
 412                                 if (s->tlsext_status_expected)
 413                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 414                                 else
 415                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 416                                 }
 417                         else
 418                                 {
 419                                 skip = 1;
 420                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 421                                 }
 422 #else
 423                                 }
 424                         else
 425                                 skip=1;
 426
 427                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 428 #endif
 429                         s->init_num=0;
 430                         break;
 431
 432                 case SSL3_ST_CR_KEY_EXCH_A:
 433                 case SSL3_ST_CR_KEY_EXCH_B:
 434                         ret=ssl3_get_key_exchange(s);
 435                         if (ret <= 0) goto end;
 436                         s->state=SSL3_ST_CR_CERT_REQ_A;
 437                         s->init_num=0;
 438
 439                         /* at this point we check that we have the
 440                          * required stuff from the server */
 441                         if (!ssl3_check_cert_and_algorithm(s))
 442                                 {
 443                                 ret= -1;
 444                                 goto end;
 445                                 }
 446                         break;
 447
 448                 case SSL3_ST_CR_CERT_REQ_A:
 449                 case SSL3_ST_CR_CERT_REQ_B:
 450                         ret=ssl3_get_certificate_request(s);
 451                         if (ret <= 0) goto end;
 452                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 453                         s->init_num=0;
 454                         break;
 455
 456                 case SSL3_ST_CR_SRVR_DONE_A:
 457                 case SSL3_ST_CR_SRVR_DONE_B:
 458                         ret=ssl3_get_server_done(s);
 459                         if (ret <= 0) goto end;
 460                         dtls1_stop_timer(s);
 461                         if (s->s3->tmp.cert_req)
 462                                 s->s3->tmp.next_state=SSL3_ST_CW_CERT_A;
 463                         else
 464                                 s->s3->tmp.next_state=SSL3_ST_CW_KEY_EXCH_A;
 465                         s->init_num=0;
 466
 467 #ifndef OPENSSL_NO_SCTP
 468                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 469                             state == SSL_ST_RENEGOTIATE)
 470                                 s->state=DTLS1_SCTP_ST_CR_READ_SOCK;
 471                         else
 472 #endif
 473                         s->state=s->s3->tmp.next_state;
 474                         break;
 475
 476                 case SSL3_ST_CW_CERT_A:
 477                 case SSL3_ST_CW_CERT_B:
 478                 case SSL3_ST_CW_CERT_C:
 479                 case SSL3_ST_CW_CERT_D:
 480                         dtls1_start_timer(s);
 481                         ret=ssl3_send_client_certificate(s);
 482                         if (ret <= 0) goto end;
 483                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 484                         s->init_num=0;
 485                         break;
 486
 487                 case SSL3_ST_CW_KEY_EXCH_A:
 488                 case SSL3_ST_CW_KEY_EXCH_B:
 489                         dtls1_start_timer(s);
 490                         ret=ssl3_send_client_key_exchange(s);
 491                         if (ret <= 0) goto end;
 492
 493 #ifndef OPENSSL_NO_SCTP
 494                         /* Add new shared key for SCTP-Auth,
 495                          * will be ignored if no SCTP used.
 496                          */
 497                         snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 498                                  DTLS1_SCTP_AUTH_LABEL);
 499
 500                         SSL_export_keying_material(s, sctpauthkey,
 501                                                    sizeof(sctpauthkey), labelbuffer,
 502                                                    sizeof(labelbuffer), NULL, 0, 0);
 503
 504                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 505                                          sizeof(sctpauthkey), sctpauthkey);
 506 #endif
 507
 508                         /* EAY EAY EAY need to check for DH fix cert
 509                          * sent back */
 510                         /* For TLS, cert_req is set to 2, so a cert chain
 511                          * of nothing is sent, but no verify packet is sent */
 512                         if (s->s3->tmp.cert_req == 1)
 513                                 {
 514                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 515                                 }
 516                         else
 517                                 {
 518 #ifndef OPENSSL_NO_SCTP
 519                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 520                                         {
 521                                         s->d1->next_state=SSL3_ST_CW_CHANGE_A;
 522                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 523                                         }
 524                                 else
 525 #endif
 526                                         s->state=SSL3_ST_CW_CHANGE_A;
 527                                 s->s3->change_cipher_spec=0;
 528                                 }
 529
 530                         s->init_num=0;
 531                         break;
 532
 533                 case SSL3_ST_CW_CERT_VRFY_A:
 534                 case SSL3_ST_CW_CERT_VRFY_B:
 535                         dtls1_start_timer(s);
 536                         ret=ssl3_send_client_verify(s);
 537                         if (ret <= 0) goto end;
 538 #ifndef OPENSSL_NO_SCTP
 539                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 540                         {
 541                                 s->d1->next_state=SSL3_ST_CW_CHANGE_A;
 542                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 543                         }
 544                         else
 545 #endif
 546                                 s->state=SSL3_ST_CW_CHANGE_A;
 547                         s->init_num=0;
 548                         s->s3->change_cipher_spec=0;
 549                         break;
 550
 551                 case SSL3_ST_CW_CHANGE_A:
 552                 case SSL3_ST_CW_CHANGE_B:
 553                         if (!s->hit)
 554                                 dtls1_start_timer(s);
 555                         ret=dtls1_send_change_cipher_spec(s,
 556                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 557                         if (ret <= 0) goto end;
 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 #ifndef OPENSSL_NO_SCTP
 586                                 if (s->hit)
 587                                         {
 588                                         /* Change to new shared key of SCTP-Auth,
 589                                          * will be ignored if no SCTP used.
 590                                          */
 591                                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
 592                                         }
 593 #endif
 594
 595                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 596                         break;
 597
 598                 case SSL3_ST_CW_FINISHED_A:
 599                 case SSL3_ST_CW_FINISHED_B:
 600                         if (!s->hit)
 601                                 dtls1_start_timer(s);
 602                         ret=ssl3_send_finished(s,
 603                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 604                                 s->method->ssl3_enc->client_finished_label,
 605                                 s->method->ssl3_enc->client_finished_label_len);
 606                         if (ret <= 0) goto end;
 607                         s->state=SSL3_ST_CW_FLUSH;
 608
 609                         /* clear flags */
 610                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 611                         if (s->hit)
 612                                 {
 613                                 s->s3->tmp.next_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 = s->s3->tmp.next_state;
 618                                                 s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 619                                         }
 620 #endif
 621                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 622                                         {
 623                                         s->state=SSL_ST_OK;
 624 #ifndef OPENSSL_NO_SCTP
 625                                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 626                                                 {
 627                                                         s->d1->next_state = SSL_ST_OK;
 628                                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 629                                                 }
 630 #endif
 631                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 632                                         s->s3->delay_buf_pop_ret=0;
 633                                         }
 634                                 }
 635                         else
 636                                 {
 637 #ifndef OPENSSL_NO_SCTP
 638                                 /* Change to new shared key of SCTP-Auth,
 639                                  * will be ignored if no SCTP used.
 640                                  */
 641                                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
 642 #endif
 643
 644 #ifndef OPENSSL_NO_TLSEXT
 645                                 /* Allow NewSessionTicket if ticket expected */
 646                                 if (s->tlsext_ticket_expected)
 647                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 648                                 else
 649 #endif
 650
 651                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 652                                 }
 653                         s->init_num=0;
 654                         break;
 655
 656 #ifndef OPENSSL_NO_TLSEXT
 657                 case SSL3_ST_CR_SESSION_TICKET_A:
 658                 case SSL3_ST_CR_SESSION_TICKET_B:
 659                         ret=ssl3_get_new_session_ticket(s);
 660                         if (ret <= 0) goto end;
 661                         s->state=SSL3_ST_CR_FINISHED_A;
 662                         s->init_num=0;
 663                 break;
 664
 665                 case SSL3_ST_CR_CERT_STATUS_A:
 666                 case SSL3_ST_CR_CERT_STATUS_B:
 667                         ret=ssl3_get_cert_status(s);
 668                         if (ret <= 0) goto end;
 669                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 670                         s->init_num=0;
 671                 break;
 672 #endif
 673
 674                 case SSL3_ST_CR_FINISHED_A:
 675                 case SSL3_ST_CR_FINISHED_B:
 676                         s->d1->change_cipher_spec_ok = 1;
 677                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 678                                 SSL3_ST_CR_FINISHED_B);
 679                         if (ret <= 0) goto end;
 680                         dtls1_stop_timer(s);
 681
 682                         if (s->hit)
 683                                 s->state=SSL3_ST_CW_CHANGE_A;
 684                         else
 685                                 s->state=SSL_ST_OK;
 686
 687 #ifndef OPENSSL_NO_SCTP
 688                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 689                                 state == SSL_ST_RENEGOTIATE)
 690                                 {
 691                                 s->d1->next_state=s->state;
 692                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 693                                 }
 694 #endif
 695
 696                         s->init_num=0;
 697                         break;
 698
 699                 case SSL3_ST_CW_FLUSH:
 700                         s->rwstate=SSL_WRITING;
 701                         if (BIO_flush(s->wbio) <= 0)
 702                                 {
 703                                 /* If the write error was fatal, stop trying */
 704                                 if (!BIO_should_retry(s->wbio))
 705                                         {
 706                                         s->rwstate=SSL_NOTHING;
 707                                         s->state=s->s3->tmp.next_state;
 708                                         }
 709
 710                                 ret= -1;
 711                                 goto end;
 712                                 }
 713                         s->rwstate=SSL_NOTHING;
 714                         s->state=s->s3->tmp.next_state;
 715                         break;
 716
 717                 case SSL_ST_OK:
 718                         /* clean a few things up */
 719                         ssl3_cleanup_key_block(s);
 720
 721 #if 0
 722                         if (s->init_buf != NULL)
 723                                 {
 724                                 BUF_MEM_free(s->init_buf);
 725                                 s->init_buf=NULL;
 726                                 }
 727 #endif
 728
 729                         /* If we are not 'joining' the last two packets,
 730                          * remove the buffering now */
 731                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 732                                 ssl_free_wbio_buffer(s);
 733                         /* else do it later in ssl3_write */
 734
 735                         s->init_num=0;
 736                         s->renegotiate=0;
 737                         s->new_session=0;
 738
 739                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 740                         if (s->hit) s->ctx->stats.sess_hit++;
 741
 742                         ret=1;
 743                         /* s->server=0; */
 744                         s->handshake_func=dtls1_connect;
 745                         s->ctx->stats.sess_connect_good++;
 746
 747                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 748
 749                         /* done with handshaking */
 750                         s->d1->handshake_read_seq  = 0;
 751                         s->d1->next_handshake_write_seq = 0;
 752                         goto end;
 753                         /* break; */
 754
 755                 default:
 756                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 757                         ret= -1;
 758                         goto end;
 759                         /* break; */
 760                         }
 761
 762                 /* did we do anything */
 763                 if (!s->s3->tmp.reuse_message && !skip)
 764                         {
 765                         if (s->debug)
 766                                 {
 767                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 768                                         goto end;
 769                                 }
 770
 771                         if ((cb != NULL) && (s->state != state))
 772                                 {
 773                                 new_state=s->state;
 774                                 s->state=state;
 775                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 776                                 s->state=new_state;
 777                                 }
 778                         }
 779                 skip=0;
 780                 }
 781 end:
 782         s->in_handshake--;
 783
 784 #ifndef OPENSSL_NO_SCTP
 785         /* Notify SCTP BIO socket to leave handshake
 786          * mode and allow stream identifier other
 787          * than 0. Will be ignored if no SCTP is used.
 788          */
 789         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
 790 #endif
 791
 792         if (buf != NULL)
 793                 BUF_MEM_free(buf);
 794         if (cb != NULL)
 795                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 796         return(ret);
 797         }
 798
 799 static int dtls1_get_hello_verify(SSL *s)
 800         {
 801         int n, al, ok = 0;
 802         unsigned char *data;
 803         unsigned int cookie_len;
 804
 805         s->first_packet = 1;
 806         n=s->method->ssl_get_message(s,
 807                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 808                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 809                 -1,
 810                 s->max_cert_list,
 811                 &ok);
 812         s->first_packet = 0;
 813
 814         if (!ok) return((int)n);
 815
 816         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 817                 {
 818                 s->d1->send_cookie = 0;
 819                 s->s3->tmp.reuse_message=1;
 820                 return(1);
 821                 }
 822
 823         data = (unsigned char *)s->init_msg;
 824 #if 0
 825         if (s->method->version != DTLS_ANY_VERSION &&
 826                 ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff))))
 827                 {
 828                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 829                 s->version=(s->version&0xff00)|data[1];
 830                 al = SSL_AD_PROTOCOL_VERSION;
 831                 goto f_err;
 832                 }
 833 #endif
 834         data+=2;
 835
 836         cookie_len = *(data++);
 837         if ( cookie_len > sizeof(s->d1->cookie))
 838                 {
 839                 al=SSL_AD_ILLEGAL_PARAMETER;
 840                 goto f_err;
 841                 }
 842
 843         memcpy(s->d1->cookie, data, cookie_len);
 844         s->d1->cookie_len = cookie_len;
 845
 846         s->d1->send_cookie = 1;
 847         return 1;
 848
 849 f_err:
 850         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 851         return -1;
 852         }
 853