ssl/d1_clnt.c

   1 /* ssl/d1_clnt.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2007 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #ifndef OPENSSL_NO_KRB5
 119 #include "kssl_lcl.h"
 120 #endif
 121 #include <openssl/buffer.h>
 122 #include <openssl/rand.h>
 123 #include <openssl/objects.h>
 124 #include <openssl/evp.h>
 125 #include <openssl/md5.h>
 126 #include <openssl/bn.h>
 127 #ifndef OPENSSL_NO_DH
 128 #include <openssl/dh.h>
 129 #endif
 130
 131 static const SSL_METHOD *dtls1_get_client_method(int ver);
 132 static int dtls1_get_hello_verify(SSL *s);
 133
 134 static const SSL_METHOD *dtls1_get_client_method(int ver)
 135         {
 136         if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
 137                 return(DTLSv1_client_method());
 138         else
 139                 return(NULL);
 140         }
 141
 142 IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,
 143                         DTLSv1_client_method,
 144                         ssl_undefined_function,
 145                         dtls1_connect,
 146                         dtls1_get_client_method,
 147                         DTLSv1_enc_data)
 148
 149 int dtls1_connect(SSL *s)
 150         {
 151         BUF_MEM *buf=NULL;
 152         unsigned long Time=(unsigned long)time(NULL);
 153         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 154         int ret= -1;
 155         int new_state,state,skip=0;
 156 #ifndef OPENSSL_NO_SCTP
 157         unsigned char sctpauthkey[64];
 158         char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
 159 #endif
 160
 161         RAND_add(&Time,sizeof(Time),0);
 162         ERR_clear_error();
 163         clear_sys_error();
 164
 165         if (s->info_callback != NULL)
 166                 cb=s->info_callback;
 167         else if (s->ctx->info_callback != NULL)
 168                 cb=s->ctx->info_callback;
 169
 170         s->in_handshake++;
 171         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 172
 173 #ifndef OPENSSL_NO_SCTP
 174         /* Notify SCTP BIO socket to enter handshake
 175          * mode and prevent stream identifier other
 176          * than 0. Will be ignored if no SCTP is used.
 177          */
 178         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
 179 #endif
 180
 181 #ifndef OPENSSL_NO_HEARTBEATS
 182         /* If we're awaiting a HeartbeatResponse, pretend we
 183          * already got and don't await it anymore, because
 184          * Heartbeats don't make sense during handshakes anyway.
 185          */
 186         if (s->tlsext_hb_pending)
 187                 {
 188                 dtls1_stop_timer(s);
 189                 s->tlsext_hb_pending = 0;
 190                 s->tlsext_hb_seq++;
 191                 }
 192 #endif
 193
 194         for (;;)
 195                 {
 196                 state=s->state;
 197
 198                 switch(s->state)
 199                         {
 200                 case SSL_ST_RENEGOTIATE:
 201                         s->renegotiate=1;
 202                         s->state=SSL_ST_CONNECT;
 203                         s->ctx->stats.sess_connect_renegotiate++;
 204                         /* break */
 205                 case SSL_ST_BEFORE:
 206                 case SSL_ST_CONNECT:
 207                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 208                 case SSL_ST_OK|SSL_ST_CONNECT:
 209
 210                         s->server=0;
 211                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 212
 213                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
 214                             (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
 215                                 {
 216                                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 217                                 ret = -1;
 218                                 goto end;
 219                                 }
 220
 221                         /* s->version=SSL3_VERSION; */
 222                         s->type=SSL_ST_CONNECT;
 223
 224                         if (s->init_buf == NULL)
 225                                 {
 226                                 if ((buf=BUF_MEM_new()) == NULL)
 227                                         {
 228                                         ret= -1;
 229                                         goto end;
 230                                         }
 231                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 232                                         {
 233                                         ret= -1;
 234                                         goto end;
 235                                         }
 236                                 s->init_buf=buf;
 237                                 buf=NULL;
 238                                 }
 239
 240                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 241
 242                         /* setup buffing BIO */
 243                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 244
 245                         /* don't push the buffering BIO quite yet */
 246
 247                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 248                         s->ctx->stats.sess_connect++;
 249                         s->init_num=0;
 250                         /* mark client_random uninitialized */
 251                         memset(s->s3->client_random,0,sizeof(s->s3->client_random));
 252                         s->d1->send_cookie = 0;
 253                         s->hit = 0;
 254                         break;
 255
 256 #ifndef OPENSSL_NO_SCTP
 257                 case DTLS1_SCTP_ST_CR_READ_SOCK:
 258
 259                         if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
 260                         {
 261                                 s->s3->in_read_app_data=2;
 262                                 s->rwstate=SSL_READING;
 263                                 BIO_clear_retry_flags(SSL_get_rbio(s));
 264                                 BIO_set_retry_read(SSL_get_rbio(s));
 265                                 ret = -1;
 266                                 goto end;
 267                         }
 268
 269                         s->state=s->s3->tmp.next_state;
 270                         break;
 271
 272                 case DTLS1_SCTP_ST_CW_WRITE_SOCK:
 273                         /* read app data until dry event */
 274
 275                         ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
 276                         if (ret < 0) goto end;
 277
 278                         if (ret == 0)
 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->d1->next_state;
 289                         break;
 290 #endif
 291
 292                 case SSL3_ST_CW_CLNT_HELLO_A:
 293                 case SSL3_ST_CW_CLNT_HELLO_B:
 294
 295                         s->shutdown=0;
 296
 297                         /* every DTLS ClientHello resets Finished MAC */
 298                         ssl3_init_finished_mac(s);
 299
 300                         dtls1_start_timer(s);
 301                         ret=ssl3_client_hello(s);
 302                         if (ret <= 0) goto end;
 303
 304                         if ( s->d1->send_cookie)
 305                                 {
 306                                 s->state=SSL3_ST_CW_FLUSH;
 307                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 308                                 }
 309                         else
 310                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 311
 312                         s->init_num=0;
 313
 314 #ifndef OPENSSL_NO_SCTP
 315                         /* Disable buffering for SCTP */
 316                         if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
 317                                 {
 318 #endif
 319                                 /* turn on buffering for the next lot of output */
 320                                 if (s->bbio != s->wbio)
 321                                         s->wbio=BIO_push(s->bbio,s->wbio);
 322 #ifndef OPENSSL_NO_SCTP
 323                                 }
 324 #endif
 325
 326                         break;
 327
 328                 case SSL3_ST_CR_SRVR_HELLO_A:
 329                 case SSL3_ST_CR_SRVR_HELLO_B:
 330                         ret=ssl3_get_server_hello(s);
 331                         if (ret <= 0) goto end;
 332                         else
 333                                 {
 334                                 if (s->hit)
 335                                         {
 336 #ifndef OPENSSL_NO_SCTP
 337                                         /* Add new shared key for SCTP-Auth,
 338                                          * will be ignored if no SCTP used.
 339                                          */
 340                                         snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 341                                                  DTLS1_SCTP_AUTH_LABEL);
 342
 343                                         SSL_export_keying_material(s, sctpauthkey,
 344                                                                    sizeof(sctpauthkey), labelbuffer,
 345                                                                    sizeof(labelbuffer), NULL, 0, 0);
 346
 347                                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 348                                                          sizeof(sctpauthkey), sctpauthkey);
 349 #endif
 350
 351                                         s->state=SSL3_ST_CR_FINISHED_A;
 352                                         }
 353                                 else
 354                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 355                                 }
 356                         s->init_num=0;
 357                         break;
 358
 359                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 360                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 361
 362                         ret = dtls1_get_hello_verify(s);
 363                         if ( ret <= 0)
 364                                 goto end;
 365                         dtls1_stop_timer(s);
 366                         if ( s->d1->send_cookie) /* start again, with a cookie */
 367                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 368                         else
 369                                 s->state = SSL3_ST_CR_CERT_A;
 370                         s->init_num = 0;
 371                         break;
 372
 373                 case SSL3_ST_CR_CERT_A:
 374                 case SSL3_ST_CR_CERT_B:
 375 #ifndef OPENSSL_NO_TLSEXT
 376                         ret=ssl3_check_finished(s);
 377                         if (ret <= 0) goto end;
 378                         if (ret == 2)
 379                                 {
 380                                 s->hit = 1;
 381                                 if (s->tlsext_ticket_expected)
 382                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 383                                 else
 384                                         s->state=SSL3_ST_CR_FINISHED_A;
 385                                 s->init_num=0;
 386                                 break;
 387                                 }
 388 #endif
 389                         /* Check if it is anon DH or PSK */
 390                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 391                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 392                                 {
 393                                 ret=ssl3_get_server_certificate(s);
 394                                 if (ret <= 0) goto end;
 395 #ifndef OPENSSL_NO_TLSEXT
 396                                 if (s->tlsext_status_expected)
 397                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 398                                 else
 399                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 400                                 }
 401                         else
 402                                 {
 403                                 skip = 1;
 404                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 405                                 }
 406 #else
 407                                 }
 408                         else
 409                                 skip=1;
 410
 411                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 412 #endif
 413                         s->init_num=0;
 414                         break;
 415
 416                 case SSL3_ST_CR_KEY_EXCH_A:
 417                 case SSL3_ST_CR_KEY_EXCH_B:
 418                         ret=ssl3_get_key_exchange(s);
 419                         if (ret <= 0) goto end;
 420                         s->state=SSL3_ST_CR_CERT_REQ_A;
 421                         s->init_num=0;
 422
 423                         /* at this point we check that we have the
 424                          * required stuff from the server */
 425                         if (!ssl3_check_cert_and_algorithm(s))
 426                                 {
 427                                 ret= -1;
 428                                 goto end;
 429                                 }
 430                         break;
 431
 432                 case SSL3_ST_CR_CERT_REQ_A:
 433                 case SSL3_ST_CR_CERT_REQ_B:
 434                         ret=ssl3_get_certificate_request(s);
 435                         if (ret <= 0) goto end;
 436                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 437                         s->init_num=0;
 438                         break;
 439
 440                 case SSL3_ST_CR_SRVR_DONE_A:
 441                 case SSL3_ST_CR_SRVR_DONE_B:
 442                         ret=ssl3_get_server_done(s);
 443                         if (ret <= 0) goto end;
 444                         dtls1_stop_timer(s);
 445                         if (s->s3->tmp.cert_req)
 446                                 s->s3->tmp.next_state=SSL3_ST_CW_CERT_A;
 447                         else
 448                                 s->s3->tmp.next_state=SSL3_ST_CW_KEY_EXCH_A;
 449                         s->init_num=0;
 450
 451 #ifndef OPENSSL_NO_SCTP
 452                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 453                             state == SSL_ST_RENEGOTIATE)
 454                                 s->state=DTLS1_SCTP_ST_CR_READ_SOCK;
 455                         else
 456 #endif
 457                         s->state=s->s3->tmp.next_state;
 458                         break;
 459
 460                 case SSL3_ST_CW_CERT_A:
 461                 case SSL3_ST_CW_CERT_B:
 462                 case SSL3_ST_CW_CERT_C:
 463                 case SSL3_ST_CW_CERT_D:
 464                         dtls1_start_timer(s);
 465                         ret=ssl3_send_client_certificate(s);
 466                         if (ret <= 0) goto end;
 467                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 468                         s->init_num=0;
 469                         break;
 470
 471                 case SSL3_ST_CW_KEY_EXCH_A:
 472                 case SSL3_ST_CW_KEY_EXCH_B:
 473                         dtls1_start_timer(s);
 474                         ret=ssl3_send_client_key_exchange(s);
 475                         if (ret <= 0) goto end;
 476
 477 #ifndef OPENSSL_NO_SCTP
 478                         /* Add new shared key for SCTP-Auth,
 479                          * will be ignored if no SCTP used.
 480                          */
 481                         snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 482                                  DTLS1_SCTP_AUTH_LABEL);
 483
 484                         SSL_export_keying_material(s, sctpauthkey,
 485                                                    sizeof(sctpauthkey), labelbuffer,
 486                                                    sizeof(labelbuffer), NULL, 0, 0);
 487
 488                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 489                                          sizeof(sctpauthkey), sctpauthkey);
 490 #endif
 491
 492                         /* EAY EAY EAY need to check for DH fix cert
 493                          * sent back */
 494                         /* For TLS, cert_req is set to 2, so a cert chain
 495                          * of nothing is sent, but no verify packet is sent */
 496                         if (s->s3->tmp.cert_req == 1)
 497                                 {
 498                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 499                                 }
 500                         else
 501                                 {
 502 #ifndef OPENSSL_NO_SCTP
 503                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 504                                         {
 505                                         s->d1->next_state=SSL3_ST_CW_CHANGE_A;
 506                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 507                                         }
 508                                 else
 509 #endif
 510                                         s->state=SSL3_ST_CW_CHANGE_A;
 511                                 s->s3->change_cipher_spec=0;
 512                                 }
 513
 514                         s->init_num=0;
 515                         break;
 516
 517                 case SSL3_ST_CW_CERT_VRFY_A:
 518                 case SSL3_ST_CW_CERT_VRFY_B:
 519                         dtls1_start_timer(s);
 520                         ret=ssl3_send_client_verify(s);
 521                         if (ret <= 0) goto end;
 522 #ifndef OPENSSL_NO_SCTP
 523                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 524                         {
 525                                 s->d1->next_state=SSL3_ST_CW_CHANGE_A;
 526                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 527                         }
 528                         else
 529 #endif
 530                                 s->state=SSL3_ST_CW_CHANGE_A;
 531                         s->init_num=0;
 532                         s->s3->change_cipher_spec=0;
 533                         break;
 534
 535                 case SSL3_ST_CW_CHANGE_A:
 536                 case SSL3_ST_CW_CHANGE_B:
 537                         if (!s->hit)
 538                                 dtls1_start_timer(s);
 539                         ret=dtls1_send_change_cipher_spec(s,
 540                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 541                         if (ret <= 0) goto end;
 542
 543 #ifndef OPENSSL_NO_SCTP
 544                         /* Change to new shared key of SCTP-Auth,
 545                          * will be ignored if no SCTP used.
 546                          */
 547                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
 548 #endif
 549
 550                         s->state=SSL3_ST_CW_FINISHED_A;
 551                         s->init_num=0;
 552
 553                         s->session->cipher=s->s3->tmp.new_cipher;
 554 #ifdef OPENSSL_NO_COMP
 555                         s->session->compress_meth=0;
 556 #else
 557                         if (s->s3->tmp.new_compression == NULL)
 558                                 s->session->compress_meth=0;
 559                         else
 560                                 s->session->compress_meth=
 561                                         s->s3->tmp.new_compression->id;
 562 #endif
 563                         if (!s->method->ssl3_enc->setup_key_block(s))
 564                                 {
 565                                 ret= -1;
 566                                 goto end;
 567                                 }
 568
 569                         if (!s->method->ssl3_enc->change_cipher_state(s,
 570                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 571                                 {
 572                                 ret= -1;
 573                                 goto end;
 574                                 }
 575
 576                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 577                         break;
 578
 579                 case SSL3_ST_CW_FINISHED_A:
 580                 case SSL3_ST_CW_FINISHED_B:
 581                         if (!s->hit)
 582                                 dtls1_start_timer(s);
 583                         ret=ssl3_send_finished(s,
 584                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 585                                 s->method->ssl3_enc->client_finished_label,
 586                                 s->method->ssl3_enc->client_finished_label_len);
 587                         if (ret <= 0) goto end;
 588                         s->state=SSL3_ST_CW_FLUSH;
 589
 590                         /* clear flags */
 591                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 592                         if (s->hit)
 593                                 {
 594                                 s->s3->tmp.next_state=SSL_ST_OK;
 595 #ifndef OPENSSL_NO_SCTP
 596                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 597                                         {
 598                                                 s->d1->next_state = s->s3->tmp.next_state;
 599                                                 s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 600                                         }
 601 #endif
 602                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 603                                         {
 604                                         s->state=SSL_ST_OK;
 605 #ifndef OPENSSL_NO_SCTP
 606                                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 607                                                 {
 608                                                         s->d1->next_state = SSL_ST_OK;
 609                                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 610                                                 }
 611 #endif
 612                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 613                                         s->s3->delay_buf_pop_ret=0;
 614                                         }
 615                                 }
 616                         else
 617                                 {
 618 #ifndef OPENSSL_NO_TLSEXT
 619                                 /* Allow NewSessionTicket if ticket expected */
 620                                 if (s->tlsext_ticket_expected)
 621                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 622                                 else
 623 #endif
 624
 625                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 626                                 }
 627                         s->init_num=0;
 628                         break;
 629
 630 #ifndef OPENSSL_NO_TLSEXT
 631                 case SSL3_ST_CR_SESSION_TICKET_A:
 632                 case SSL3_ST_CR_SESSION_TICKET_B:
 633                         ret=ssl3_get_new_session_ticket(s);
 634                         if (ret <= 0) goto end;
 635                         s->state=SSL3_ST_CR_FINISHED_A;
 636                         s->init_num=0;
 637                 break;
 638
 639                 case SSL3_ST_CR_CERT_STATUS_A:
 640                 case SSL3_ST_CR_CERT_STATUS_B:
 641                         ret=ssl3_get_cert_status(s);
 642                         if (ret <= 0) goto end;
 643                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 644                         s->init_num=0;
 645                 break;
 646 #endif
 647
 648                 case SSL3_ST_CR_FINISHED_A:
 649                 case SSL3_ST_CR_FINISHED_B:
 650                         s->d1->change_cipher_spec_ok = 1;
 651                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 652                                 SSL3_ST_CR_FINISHED_B);
 653                         if (ret <= 0) goto end;
 654                         dtls1_stop_timer(s);
 655
 656                         if (s->hit)
 657                                 s->state=SSL3_ST_CW_CHANGE_A;
 658                         else
 659                                 s->state=SSL_ST_OK;
 660
 661 #ifndef OPENSSL_NO_SCTP
 662                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 663                                 state == SSL_ST_RENEGOTIATE)
 664                                 {
 665                                 s->d1->next_state=s->state;
 666                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 667                                 }
 668 #endif
 669
 670                         s->init_num=0;
 671                         break;
 672
 673                 case SSL3_ST_CW_FLUSH:
 674                         s->rwstate=SSL_WRITING;
 675                         if (BIO_flush(s->wbio) <= 0)
 676                                 {
 677                                 /* If the write error was fatal, stop trying */
 678                                 if (!BIO_should_retry(s->wbio))
 679                                         {
 680                                         s->rwstate=SSL_NOTHING;
 681                                         s->state=s->s3->tmp.next_state;
 682                                         }
 683
 684                                 ret= -1;
 685                                 goto end;
 686                                 }
 687                         s->rwstate=SSL_NOTHING;
 688                         s->state=s->s3->tmp.next_state;
 689                         break;
 690
 691                 case SSL_ST_OK:
 692                         /* clean a few things up */
 693                         ssl3_cleanup_key_block(s);
 694
 695 #if 0
 696                         if (s->init_buf != NULL)
 697                                 {
 698                                 BUF_MEM_free(s->init_buf);
 699                                 s->init_buf=NULL;
 700                                 }
 701 #endif
 702
 703                         /* If we are not 'joining' the last two packets,
 704                          * remove the buffering now */
 705                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 706                                 ssl_free_wbio_buffer(s);
 707                         /* else do it later in ssl3_write */
 708
 709                         s->init_num=0;
 710                         s->renegotiate=0;
 711                         s->new_session=0;
 712
 713                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 714                         if (s->hit) s->ctx->stats.sess_hit++;
 715
 716                         ret=1;
 717                         /* s->server=0; */
 718                         s->handshake_func=dtls1_connect;
 719                         s->ctx->stats.sess_connect_good++;
 720
 721                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 722
 723                         /* done with handshaking */
 724                         s->d1->handshake_read_seq  = 0;
 725                         s->d1->next_handshake_write_seq = 0;
 726                         goto end;
 727                         /* break; */
 728
 729                 default:
 730                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 731                         ret= -1;
 732                         goto end;
 733                         /* break; */
 734                         }
 735
 736                 /* did we do anything */
 737                 if (!s->s3->tmp.reuse_message && !skip)
 738                         {
 739                         if (s->debug)
 740                                 {
 741                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 742                                         goto end;
 743                                 }
 744
 745                         if ((cb != NULL) && (s->state != state))
 746                                 {
 747                                 new_state=s->state;
 748                                 s->state=state;
 749                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 750                                 s->state=new_state;
 751                                 }
 752                         }
 753                 skip=0;
 754                 }
 755 end:
 756         s->in_handshake--;
 757
 758 #ifndef OPENSSL_NO_SCTP
 759         /* Notify SCTP BIO socket to leave handshake
 760          * mode and allow stream identifier other
 761          * than 0. Will be ignored if no SCTP is used.
 762          */
 763         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
 764 #endif
 765
 766         if (buf != NULL)
 767                 BUF_MEM_free(buf);
 768         if (cb != NULL)
 769                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 770         return(ret);
 771         }
 772
 773 static int dtls1_get_hello_verify(SSL *s)
 774         {
 775         int n, al, ok = 0;
 776         unsigned char *data;
 777         unsigned int cookie_len;
 778
 779         n=s->method->ssl_get_message(s,
 780                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 781                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 782                 -1,
 783                 s->max_cert_list,
 784                 &ok);
 785
 786         if (!ok) return((int)n);
 787
 788         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 789                 {
 790                 s->d1->send_cookie = 0;
 791                 s->s3->tmp.reuse_message=1;
 792                 return(1);
 793                 }
 794
 795         data = (unsigned char *)s->init_msg;
 796
 797         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 798                 {
 799                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 800                 s->version=(s->version&0xff00)|data[1];
 801                 al = SSL_AD_PROTOCOL_VERSION;
 802                 goto f_err;
 803                 }
 804         data+=2;
 805
 806         cookie_len = *(data++);
 807         if ( cookie_len > sizeof(s->d1->cookie))
 808                 {
 809                 al=SSL_AD_ILLEGAL_PARAMETER;
 810                 goto f_err;
 811                 }
 812
 813         memcpy(s->d1->cookie, data, cookie_len);
 814         s->d1->cookie_len = cookie_len;
 815
 816         s->d1->send_cookie = 1;
 817         return 1;
 818
 819 f_err:
 820         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 821         return -1;
 822         }
 823