crypto/openssl/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) 1999-2005 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 #include "kssl_lcl.h"
 119 #include <openssl/buffer.h>
 120 #include <openssl/rand.h>
 121 #include <openssl/objects.h>
 122 #include <openssl/evp.h>
 123 #include <openssl/md5.h>
 124 #ifndef OPENSSL_NO_DH
 125 #include <openssl/dh.h>
 126 #endif
 127
 128 static SSL_METHOD *dtls1_get_client_method(int ver);
 129 static int dtls1_get_hello_verify(SSL *s);
 130
 131 static SSL_METHOD *dtls1_get_client_method(int ver)
 132         {
 133         if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
 134                 return(DTLSv1_client_method());
 135         else
 136                 return(NULL);
 137         }
 138
 139 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
 140                         ssl_undefined_function,
 141                         dtls1_connect,
 142                         dtls1_get_client_method)
 143
 144 int dtls1_connect(SSL *s)
 145         {
 146         BUF_MEM *buf=NULL;
 147         unsigned long Time=(unsigned long)time(NULL);
 148         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 149         int ret= -1;
 150         int new_state,state,skip=0;;
 151
 152         RAND_add(&Time,sizeof(Time),0);
 153         ERR_clear_error();
 154         clear_sys_error();
 155
 156         if (s->info_callback != NULL)
 157                 cb=s->info_callback;
 158         else if (s->ctx->info_callback != NULL)
 159                 cb=s->ctx->info_callback;
 160
 161         s->in_handshake++;
 162         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 163
 164         for (;;)
 165                 {
 166                 state=s->state;
 167
 168                 switch(s->state)
 169                         {
 170                 case SSL_ST_RENEGOTIATE:
 171                         s->new_session=1;
 172                         s->state=SSL_ST_CONNECT;
 173                         s->ctx->stats.sess_connect_renegotiate++;
 174                         /* break */
 175                 case SSL_ST_BEFORE:
 176                 case SSL_ST_CONNECT:
 177                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 178                 case SSL_ST_OK|SSL_ST_CONNECT:
 179
 180                         s->server=0;
 181                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 182
 183                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
 184                             (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
 185                                 {
 186                                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 187                                 ret = -1;
 188                                 goto end;
 189                                 }
 190
 191                         /* s->version=SSL3_VERSION; */
 192                         s->type=SSL_ST_CONNECT;
 193
 194                         if (s->init_buf == NULL)
 195                                 {
 196                                 if ((buf=BUF_MEM_new()) == NULL)
 197                                         {
 198                                         ret= -1;
 199                                         goto end;
 200                                         }
 201                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 202                                         {
 203                                         ret= -1;
 204                                         goto end;
 205                                         }
 206                                 s->init_buf=buf;
 207                                 buf=NULL;
 208                                 }
 209
 210                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 211
 212                         /* setup buffing BIO */
 213                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 214
 215                         /* don't push the buffering BIO quite yet */
 216
 217                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 218                         s->ctx->stats.sess_connect++;
 219                         s->init_num=0;
 220                         /* mark client_random uninitialized */
 221                         memset(s->s3->client_random,0,sizeof(s->s3->client_random));
 222                         s->d1->send_cookie = 0;
 223                         s->hit = 0;
 224                         break;
 225
 226                 case SSL3_ST_CW_CLNT_HELLO_A:
 227                 case SSL3_ST_CW_CLNT_HELLO_B:
 228
 229                         s->shutdown=0;
 230
 231                         /* every DTLS ClientHello resets Finished MAC */
 232                         ssl3_init_finished_mac(s);
 233
 234                         dtls1_start_timer(s);
 235                         ret=dtls1_client_hello(s);
 236                         if (ret <= 0) goto end;
 237
 238                         if ( s->d1->send_cookie)
 239                                 {
 240                                 s->state=SSL3_ST_CW_FLUSH;
 241                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 242                                 }
 243                         else
 244                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 245
 246                         s->init_num=0;
 247
 248                         /* turn on buffering for the next lot of output */
 249                         if (s->bbio != s->wbio)
 250                                 s->wbio=BIO_push(s->bbio,s->wbio);
 251
 252                         break;
 253
 254                 case SSL3_ST_CR_SRVR_HELLO_A:
 255                 case SSL3_ST_CR_SRVR_HELLO_B:
 256                         ret=ssl3_get_server_hello(s);
 257                         if (ret <= 0) goto end;
 258                         else
 259                                 {
 260                                 dtls1_stop_timer(s);
 261                                 if (s->hit)
 262                                         s->state=SSL3_ST_CR_FINISHED_A;
 263                                 else
 264                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 265                                 }
 266                         s->init_num=0;
 267                         break;
 268
 269                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 270                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 271
 272                         ret = dtls1_get_hello_verify(s);
 273                         if ( ret <= 0)
 274                                 goto end;
 275                         dtls1_stop_timer(s);
 276                         if ( s->d1->send_cookie) /* start again, with a cookie */
 277                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 278                         else
 279                                 s->state = SSL3_ST_CR_CERT_A;
 280                         s->init_num = 0;
 281                         break;
 282
 283                 case SSL3_ST_CR_CERT_A:
 284                 case SSL3_ST_CR_CERT_B:
 285 #ifndef OPENSSL_NO_TLSEXT
 286                         ret=ssl3_check_finished(s);
 287                         if (ret <= 0) goto end;
 288                         if (ret == 2)
 289                                 {
 290                                 s->hit = 1;
 291                                 if (s->tlsext_ticket_expected)
 292                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 293                                 else
 294                                         s->state=SSL3_ST_CR_FINISHED_A;
 295                                 s->init_num=0;
 296                                 break;
 297                                 }
 298 #endif
 299                         /* Check if it is anon DH */
 300                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 301                                 {
 302                                 ret=ssl3_get_server_certificate(s);
 303                                 if (ret <= 0) goto end;
 304 #ifndef OPENSSL_NO_TLSEXT
 305                                 if (s->tlsext_status_expected)
 306                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 307                                 else
 308                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 309                                 }
 310                         else
 311                                 {
 312                                 skip = 1;
 313                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 314                                 }
 315 #else
 316                                 }
 317                         else
 318                                 skip=1;
 319
 320                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 321 #endif
 322                         s->init_num=0;
 323                         break;
 324
 325                 case SSL3_ST_CR_KEY_EXCH_A:
 326                 case SSL3_ST_CR_KEY_EXCH_B:
 327                         ret=ssl3_get_key_exchange(s);
 328                         if (ret <= 0) goto end;
 329                         s->state=SSL3_ST_CR_CERT_REQ_A;
 330                         s->init_num=0;
 331
 332                         /* at this point we check that we have the
 333                          * required stuff from the server */
 334                         if (!ssl3_check_cert_and_algorithm(s))
 335                                 {
 336                                 ret= -1;
 337                                 goto end;
 338                                 }
 339                         break;
 340
 341                 case SSL3_ST_CR_CERT_REQ_A:
 342                 case SSL3_ST_CR_CERT_REQ_B:
 343                         ret=ssl3_get_certificate_request(s);
 344                         if (ret <= 0) goto end;
 345                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 346                         s->init_num=0;
 347                         break;
 348
 349                 case SSL3_ST_CR_SRVR_DONE_A:
 350                 case SSL3_ST_CR_SRVR_DONE_B:
 351                         ret=ssl3_get_server_done(s);
 352                         if (ret <= 0) goto end;
 353                         if (s->s3->tmp.cert_req)
 354                                 s->state=SSL3_ST_CW_CERT_A;
 355                         else
 356                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 357                         s->init_num=0;
 358
 359                         break;
 360
 361                 case SSL3_ST_CW_CERT_A:
 362                 case SSL3_ST_CW_CERT_B:
 363                 case SSL3_ST_CW_CERT_C:
 364                 case SSL3_ST_CW_CERT_D:
 365                         dtls1_start_timer(s);
 366                         ret=dtls1_send_client_certificate(s);
 367                         if (ret <= 0) goto end;
 368                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 369                         s->init_num=0;
 370                         break;
 371
 372                 case SSL3_ST_CW_KEY_EXCH_A:
 373                 case SSL3_ST_CW_KEY_EXCH_B:
 374                         dtls1_start_timer(s);
 375                         ret=dtls1_send_client_key_exchange(s);
 376                         if (ret <= 0) goto end;
 377                         /* EAY EAY EAY need to check for DH fix cert
 378                          * sent back */
 379                         /* For TLS, cert_req is set to 2, so a cert chain
 380                          * of nothing is sent, but no verify packet is sent */
 381                         if (s->s3->tmp.cert_req == 1)
 382                                 {
 383                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 384                                 }
 385                         else
 386                                 {
 387                                 s->state=SSL3_ST_CW_CHANGE_A;
 388                                 s->s3->change_cipher_spec=0;
 389                                 }
 390
 391                         s->init_num=0;
 392                         break;
 393
 394                 case SSL3_ST_CW_CERT_VRFY_A:
 395                 case SSL3_ST_CW_CERT_VRFY_B:
 396                         dtls1_start_timer(s);
 397                         ret=dtls1_send_client_verify(s);
 398                         if (ret <= 0) goto end;
 399                         s->state=SSL3_ST_CW_CHANGE_A;
 400                         s->init_num=0;
 401                         s->s3->change_cipher_spec=0;
 402                         break;
 403
 404                 case SSL3_ST_CW_CHANGE_A:
 405                 case SSL3_ST_CW_CHANGE_B:
 406                         dtls1_start_timer(s);
 407                         ret=dtls1_send_change_cipher_spec(s,
 408                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 409                         if (ret <= 0) goto end;
 410                         s->state=SSL3_ST_CW_FINISHED_A;
 411                         s->init_num=0;
 412
 413                         s->session->cipher=s->s3->tmp.new_cipher;
 414 #ifdef OPENSSL_NO_COMP
 415                         s->session->compress_meth=0;
 416 #else
 417                         if (s->s3->tmp.new_compression == NULL)
 418                                 s->session->compress_meth=0;
 419                         else
 420                                 s->session->compress_meth=
 421                                         s->s3->tmp.new_compression->id;
 422 #endif
 423                         if (!s->method->ssl3_enc->setup_key_block(s))
 424                                 {
 425                                 ret= -1;
 426                                 goto end;
 427                                 }
 428
 429                         if (!s->method->ssl3_enc->change_cipher_state(s,
 430                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 431                                 {
 432                                 ret= -1;
 433                                 goto end;
 434                                 }
 435
 436                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 437                         break;
 438
 439                 case SSL3_ST_CW_FINISHED_A:
 440                 case SSL3_ST_CW_FINISHED_B:
 441                         dtls1_start_timer(s);
 442                         ret=dtls1_send_finished(s,
 443                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 444                                 s->method->ssl3_enc->client_finished_label,
 445                                 s->method->ssl3_enc->client_finished_label_len);
 446                         if (ret <= 0) goto end;
 447                         s->state=SSL3_ST_CW_FLUSH;
 448
 449                         /* clear flags */
 450                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 451                         if (s->hit)
 452                                 {
 453                                 s->s3->tmp.next_state=SSL_ST_OK;
 454                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 455                                         {
 456                                         s->state=SSL_ST_OK;
 457                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 458                                         s->s3->delay_buf_pop_ret=0;
 459                                         }
 460                                 }
 461                         else
 462                                 {
 463 #ifndef OPENSSL_NO_TLSEXT
 464                                 /* Allow NewSessionTicket if ticket expected */
 465                                 if (s->tlsext_ticket_expected)
 466                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 467                                 else
 468 #endif
 469
 470                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 471                                 }
 472                         s->init_num=0;
 473
 474                         break;
 475
 476 #ifndef OPENSSL_NO_TLSEXT
 477                 case SSL3_ST_CR_SESSION_TICKET_A:
 478                 case SSL3_ST_CR_SESSION_TICKET_B:
 479                         ret=ssl3_get_new_session_ticket(s);
 480                         if (ret <= 0) goto end;
 481                         s->state=SSL3_ST_CR_FINISHED_A;
 482                         s->init_num=0;
 483                 break;
 484
 485                 case SSL3_ST_CR_CERT_STATUS_A:
 486                 case SSL3_ST_CR_CERT_STATUS_B:
 487                         ret=ssl3_get_cert_status(s);
 488                         if (ret <= 0) goto end;
 489                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 490                         s->init_num=0;
 491                 break;
 492 #endif
 493
 494                 case SSL3_ST_CR_FINISHED_A:
 495                 case SSL3_ST_CR_FINISHED_B:
 496                         s->d1->change_cipher_spec_ok = 1;
 497                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 498                                 SSL3_ST_CR_FINISHED_B);
 499                         if (ret <= 0) goto end;
 500                         dtls1_stop_timer(s);
 501
 502                         if (s->hit)
 503                                 s->state=SSL3_ST_CW_CHANGE_A;
 504                         else
 505                                 s->state=SSL_ST_OK;
 506                         s->init_num=0;
 507                         break;
 508
 509                 case SSL3_ST_CW_FLUSH:
 510                         s->rwstate=SSL_WRITING;
 511                         if (BIO_flush(s->wbio) <= 0)
 512                                 {
 513                                 ret= -1;
 514                                 goto end;
 515                                 }
 516                         s->rwstate=SSL_NOTHING;
 517                         s->state=s->s3->tmp.next_state;
 518                         break;
 519
 520                 case SSL_ST_OK:
 521                         /* clean a few things up */
 522                         ssl3_cleanup_key_block(s);
 523
 524 #if 0
 525                         if (s->init_buf != NULL)
 526                                 {
 527                                 BUF_MEM_free(s->init_buf);
 528                                 s->init_buf=NULL;
 529                                 }
 530 #endif
 531
 532                         /* If we are not 'joining' the last two packets,
 533                          * remove the buffering now */
 534                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 535                                 ssl_free_wbio_buffer(s);
 536                         /* else do it later in ssl3_write */
 537
 538                         s->init_num=0;
 539                         s->new_session=0;
 540
 541                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 542                         if (s->hit) s->ctx->stats.sess_hit++;
 543
 544                         ret=1;
 545                         /* s->server=0; */
 546                         s->handshake_func=dtls1_connect;
 547                         s->ctx->stats.sess_connect_good++;
 548
 549                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 550
 551                         /* done with handshaking */
 552                         s->d1->handshake_read_seq  = 0;
 553                         s->d1->next_handshake_write_seq = 0;
 554                         goto end;
 555                         /* break; */
 556
 557                 default:
 558                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 559                         ret= -1;
 560                         goto end;
 561                         /* break; */
 562                         }
 563
 564                 /* did we do anything */
 565                 if (!s->s3->tmp.reuse_message && !skip)
 566                         {
 567                         if (s->debug)
 568                                 {
 569                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 570                                         goto end;
 571                                 }
 572
 573                         if ((cb != NULL) && (s->state != state))
 574                                 {
 575                                 new_state=s->state;
 576                                 s->state=state;
 577                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 578                                 s->state=new_state;
 579                                 }
 580                         }
 581                 skip=0;
 582                 }
 583 end:
 584         s->in_handshake--;
 585         if (buf != NULL)
 586                 BUF_MEM_free(buf);
 587         if (cb != NULL)
 588                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 589         return(ret);
 590         }
 591
 592 int dtls1_client_hello(SSL *s)
 593         {
 594         unsigned char *buf;
 595         unsigned char *p,*d;
 596         unsigned int i,j;
 597         unsigned long Time,l;
 598         SSL_COMP *comp;
 599
 600         buf=(unsigned char *)s->init_buf->data;
 601         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 602                 {
 603                 SSL_SESSION *sess = s->session;
 604                 if ((s->session == NULL) ||
 605                         (s->session->ssl_version != s->version) ||
 606 #ifdef OPENSSL_NO_TLSEXT
 607                         !sess->session_id_length ||
 608 #else
 609                         (!sess->session_id_length && !sess->tlsext_tick) ||
 610 #endif
 611                         (s->session->not_resumable))
 612                         {
 613                         if (!ssl_get_new_session(s,0))
 614                                 goto err;
 615                         }
 616                 /* else use the pre-loaded session */
 617
 618                 p=s->s3->client_random;
 619                 /* if client_random is initialized, reuse it, we are
 620                  * required to use same upon reply to HelloVerify */
 621                 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
 622                 if (i==sizeof(s->s3->client_random))
 623                         {
 624                         Time=(unsigned long)time(NULL); /* Time */
 625                         l2n(Time,p);
 626                         RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4);
 627                         }
 628
 629                 /* Do the message type and length last */
 630                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 631
 632                 *(p++)=s->version>>8;
 633                 *(p++)=s->version&0xff;
 634                 s->client_version=s->version;
 635
 636                 /* Random stuff */
 637                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 638                 p+=SSL3_RANDOM_SIZE;
 639
 640                 /* Session ID */
 641                 if (s->new_session)
 642                         i=0;
 643                 else
 644                         i=s->session->session_id_length;
 645                 *(p++)=i;
 646                 if (i != 0)
 647                         {
 648                         if (i > sizeof s->session->session_id)
 649                                 {
 650                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 651                                 goto err;
 652                                 }
 653                         memcpy(p,s->session->session_id,i);
 654                         p+=i;
 655                         }
 656
 657                 /* cookie stuff */
 658                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 659                         {
 660                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 661                         goto err;
 662                         }
 663                 *(p++) = s->d1->cookie_len;
 664                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 665                 p += s->d1->cookie_len;
 666
 667                 /* Ciphers supported */
 668                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 669                 if (i == 0)
 670                         {
 671                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 672                         goto err;
 673                         }
 674                 s2n(i,p);
 675                 p+=i;
 676
 677                 /* COMPRESSION */
 678                 if (s->ctx->comp_methods == NULL)
 679                         j=0;
 680                 else
 681                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 682                 *(p++)=1+j;
 683                 for (i=0; i<j; i++)
 684                         {
 685                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 686                         *(p++)=comp->id;
 687                         }
 688                 *(p++)=0; /* Add the NULL method */
 689
 690 #ifndef OPENSSL_NO_TLSEXT
 691                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 692                         {
 693                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 694                         goto err;
 695                         }
 696 #endif
 697
 698                 l=(p-d);
 699                 d=buf;
 700
 701                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 702
 703                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 704                 /* number of bytes to write */
 705                 s->init_num=p-buf;
 706                 s->init_off=0;
 707
 708                 /* buffer the message to handle re-xmits */
 709                 dtls1_buffer_message(s, 0);
 710                 }
 711
 712         /* SSL3_ST_CW_CLNT_HELLO_B */
 713         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 714 err:
 715         return(-1);
 716         }
 717
 718 static int dtls1_get_hello_verify(SSL *s)
 719         {
 720         int n, al, ok = 0;
 721         unsigned char *data;
 722         unsigned int cookie_len;
 723
 724         n=s->method->ssl_get_message(s,
 725                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 726                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 727                 -1,
 728                 s->max_cert_list,
 729                 &ok);
 730
 731         if (!ok) return((int)n);
 732
 733         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 734                 {
 735                 s->d1->send_cookie = 0;
 736                 s->s3->tmp.reuse_message=1;
 737                 return(1);
 738                 }
 739
 740         data = (unsigned char *)s->init_msg;
 741
 742         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 743                 {
 744                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 745                 s->version=(s->version&0xff00)|data[1];
 746                 al = SSL_AD_PROTOCOL_VERSION;
 747                 goto f_err;
 748                 }
 749         data+=2;
 750
 751         cookie_len = *(data++);
 752         if ( cookie_len > sizeof(s->d1->cookie))
 753                 {
 754                 al=SSL_AD_ILLEGAL_PARAMETER;
 755                 goto f_err;
 756                 }
 757
 758         memcpy(s->d1->cookie, data, cookie_len);
 759         s->d1->cookie_len = cookie_len;
 760
 761         s->d1->send_cookie = 1;
 762         return 1;
 763
 764 f_err:
 765         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 766         return -1;
 767         }
 768
 769 int dtls1_send_client_key_exchange(SSL *s)
 770         {
 771         unsigned char *p,*d;
 772         int n;
 773         unsigned long l;
 774 #ifndef OPENSSL_NO_RSA
 775         unsigned char *q;
 776         EVP_PKEY *pkey=NULL;
 777 #endif
 778 #ifndef OPENSSL_NO_KRB5
 779         KSSL_ERR kssl_err;
 780 #endif /* OPENSSL_NO_KRB5 */
 781
 782         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
 783                 {
 784                 d=(unsigned char *)s->init_buf->data;
 785                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 786
 787                 l=s->s3->tmp.new_cipher->algorithms;
 788
 789                 /* Fool emacs indentation */
 790                 if (0) {}
 791 #ifndef OPENSSL_NO_RSA
 792                 else if (l & SSL_kRSA)
 793                         {
 794                         RSA *rsa;
 795                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 796
 797                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
 798                                 rsa=s->session->sess_cert->peer_rsa_tmp;
 799                         else
 800                                 {
 801                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 802                                 if ((pkey == NULL) ||
 803                                         (pkey->type != EVP_PKEY_RSA) ||
 804                                         (pkey->pkey.rsa == NULL))
 805                                         {
 806                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 807                                         goto err;
 808                                         }
 809                                 rsa=pkey->pkey.rsa;
 810                                 EVP_PKEY_free(pkey);
 811                                 }
 812
 813                         tmp_buf[0]=s->client_version>>8;
 814                         tmp_buf[1]=s->client_version&0xff;
 815                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
 816                                         goto err;
 817
 818                         s->session->master_key_length=sizeof tmp_buf;
 819
 820                         q=p;
 821                         /* Fix buf for TLS and [incidentally] DTLS */
 822                         if (s->version > SSL3_VERSION)
 823                                 p+=2;
 824                         n=RSA_public_encrypt(sizeof tmp_buf,
 825                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
 826 #ifdef PKCS1_CHECK
 827                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
 828                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
 829 #endif
 830                         if (n <= 0)
 831                                 {
 832                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
 833                                 goto err;
 834                                 }
 835
 836                         /* Fix buf for TLS and [incidentally] DTLS */
 837                         if (s->version > SSL3_VERSION)
 838                                 {
 839                                 s2n(n,q);
 840                                 n+=2;
 841                                 }
 842
 843                         s->session->master_key_length=
 844                                 s->method->ssl3_enc->generate_master_secret(s,
 845                                         s->session->master_key,
 846                                         tmp_buf,sizeof tmp_buf);
 847                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
 848                         }
 849 #endif
 850 #ifndef OPENSSL_NO_KRB5
 851                 else if (l & SSL_kKRB5)
 852                         {
 853                         krb5_error_code krb5rc;
 854                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
 855                         /*  krb5_data   krb5_ap_req;  */
 856                         krb5_data       *enc_ticket;
 857                         krb5_data       authenticator, *authp = NULL;
 858                         EVP_CIPHER_CTX  ciph_ctx;
 859                         EVP_CIPHER      *enc = NULL;
 860                         unsigned char   iv[EVP_MAX_IV_LENGTH];
 861                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 862                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
 863                                                 + EVP_MAX_IV_LENGTH];
 864                         int             padl, outl = sizeof(epms);
 865
 866                         EVP_CIPHER_CTX_init(&ciph_ctx);
 867
 868 #ifdef KSSL_DEBUG
 869                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
 870                                 l, SSL_kKRB5);
 871 #endif  /* KSSL_DEBUG */
 872
 873                         authp = NULL;
 874 #ifdef KRB5SENDAUTH
 875                         if (KRB5SENDAUTH)  authp = &authenticator;
 876 #endif  /* KRB5SENDAUTH */
 877
 878                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
 879                                 &kssl_err);
 880                         enc = kssl_map_enc(kssl_ctx->enctype);
 881                         if (enc == NULL)
 882                             goto err;
 883 #ifdef KSSL_DEBUG
 884                         {
 885                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
 886                         if (krb5rc && kssl_err.text)
 887                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
 888                         }
 889 #endif  /* KSSL_DEBUG */
 890
 891                         if (krb5rc)
 892                                 {
 893                                 ssl3_send_alert(s,SSL3_AL_FATAL,
 894                                                 SSL_AD_HANDSHAKE_FAILURE);
 895                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 896                                                 kssl_err.reason);
 897                                 goto err;
 898                                 }
 899
 900                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
 901                         **  in place of RFC 2712 KerberosWrapper, as in:
 902                         **
 903                         **  Send ticket (copy to *p, set n = length)
 904                         **  n = krb5_ap_req.length;
 905                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
 906                         **  if (krb5_ap_req.data)
 907                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
 908                         **
 909                         **  Now using real RFC 2712 KerberosWrapper
 910                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
 911                         **  Note: 2712 "opaque" types are here replaced
 912                         **  with a 2-byte length followed by the value.
 913                         **  Example:
 914                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
 915                         **  Where "xx xx" = length bytes.  Shown here with
 916                         **  optional authenticator omitted.
 917                         */
 918
 919                         /*  KerberosWrapper.Ticket              */
 920                         s2n(enc_ticket->length,p);
 921                         memcpy(p, enc_ticket->data, enc_ticket->length);
 922                         p+= enc_ticket->length;
 923                         n = enc_ticket->length + 2;
 924
 925                         /*  KerberosWrapper.Authenticator       */
 926                         if (authp  &&  authp->length)
 927                                 {
 928                                 s2n(authp->length,p);
 929                                 memcpy(p, authp->data, authp->length);
 930                                 p+= authp->length;
 931                                 n+= authp->length + 2;
 932
 933                                 free(authp->data);
 934                                 authp->data = NULL;
 935                                 authp->length = 0;
 936                                 }
 937                         else
 938                                 {
 939                                 s2n(0,p);/*  null authenticator length  */
 940                                 n+=2;
 941                                 }
 942
 943                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
 944                             goto err;
 945
 946                         /*  20010420 VRS.  Tried it this way; failed.
 947                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
 948                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
 949                         **                              kssl_ctx->length);
 950                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
 951                         */
 952
 953                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
 954                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
 955                                 kssl_ctx->key,iv);
 956                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
 957                                 sizeof tmp_buf);
 958                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
 959                         outl += padl;
 960                         if (outl > sizeof epms)
 961                                 {
 962                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 963                                 goto err;
 964                                 }
 965                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
 966
 967                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
 968                         s2n(outl,p);
 969                         memcpy(p, epms, outl);
 970                         p+=outl;
 971                         n+=outl + 2;
 972
 973                         s->session->master_key_length=
 974                                 s->method->ssl3_enc->generate_master_secret(s,
 975                                         s->session->master_key,
 976                                         tmp_buf, sizeof tmp_buf);
 977
 978                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
 979                         OPENSSL_cleanse(epms, outl);
 980                         }
 981 #endif
 982 #ifndef OPENSSL_NO_DH
 983                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 984                         {
 985                         DH *dh_srvr,*dh_clnt;
 986
 987                         if (s->session->sess_cert->peer_dh_tmp != NULL)
 988                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
 989                         else
 990                                 {
 991                                 /* we get them from the cert */
 992                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 993                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
 994                                 goto err;
 995                                 }
 996
 997                         /* generate a new random key */
 998                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
 999                                 {
1000                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1001                                 goto err;
1002                                 }
1003                         if (!DH_generate_key(dh_clnt))
1004                                 {
1005                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1006                                 goto err;
1007                                 }
1008
1009                         /* use the 'p' output buffer for the DH key, but
1010                          * make sure to clear it out afterwards */
1011
1012                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1013
1014                         if (n <= 0)
1015                                 {
1016                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1017                                 goto err;
1018                                 }
1019
1020                         /* generate master key from the result */
1021                         s->session->master_key_length=
1022                                 s->method->ssl3_enc->generate_master_secret(s,
1023                                         s->session->master_key,p,n);
1024                         /* clean up */
1025                         memset(p,0,n);
1026
1027                         /* send off the data */
1028                         n=BN_num_bytes(dh_clnt->pub_key);
1029                         s2n(n,p);
1030                         BN_bn2bin(dh_clnt->pub_key,p);
1031                         n+=2;
1032
1033                         DH_free(dh_clnt);
1034
1035                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1036                         }
1037 #endif
1038                 else
1039                         {
1040                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1041                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1042                         goto err;
1043                         }
1044
1045                 d = dtls1_set_message_header(s, d,
1046                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1047                 /*
1048                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1049                  l2n3(n,d);
1050                  l2n(s->d1->handshake_write_seq,d);
1051                  s->d1->handshake_write_seq++;
1052                 */
1053
1054                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1055                 /* number of bytes to write */
1056                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1057                 s->init_off=0;
1058
1059                 /* buffer the message to handle re-xmits */
1060                 dtls1_buffer_message(s, 0);
1061                 }
1062
1063         /* SSL3_ST_CW_KEY_EXCH_B */
1064         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1065 err:
1066         return(-1);
1067         }
1068
1069 int dtls1_send_client_verify(SSL *s)
1070         {
1071         unsigned char *p,*d;
1072         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1073         EVP_PKEY *pkey;
1074 #ifndef OPENSSL_NO_RSA
1075         unsigned u=0;
1076 #endif
1077         unsigned long n;
1078 #ifndef OPENSSL_NO_DSA
1079         int j;
1080 #endif
1081
1082         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1083                 {
1084                 d=(unsigned char *)s->init_buf->data;
1085                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1086                 pkey=s->cert->key->privatekey;
1087
1088                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1089                         &(data[MD5_DIGEST_LENGTH]));
1090
1091 #ifndef OPENSSL_NO_RSA
1092                 if (pkey->type == EVP_PKEY_RSA)
1093                         {
1094                         s->method->ssl3_enc->cert_verify_mac(s,
1095                                 &(s->s3->finish_dgst1),&(data[0]));
1096                         if (RSA_sign(NID_md5_sha1, data,
1097                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1098                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1099                                 {
1100                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1101                                 goto err;
1102                                 }
1103                         s2n(u,p);
1104                         n=u+2;
1105                         }
1106                 else
1107 #endif
1108 #ifndef OPENSSL_NO_DSA
1109                         if (pkey->type == EVP_PKEY_DSA)
1110                         {
1111                         if (!DSA_sign(pkey->save_type,
1112                                 &(data[MD5_DIGEST_LENGTH]),
1113                                 SHA_DIGEST_LENGTH,&(p[2]),
1114                                 (unsigned int *)&j,pkey->pkey.dsa))
1115                                 {
1116                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1117                                 goto err;
1118                                 }
1119                         s2n(j,p);
1120                         n=j+2;
1121                         }
1122                 else
1123 #endif
1124                         {
1125                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1126                         goto err;
1127                         }
1128
1129                 d = dtls1_set_message_header(s, d,
1130                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1131
1132                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1133                 s->init_off=0;
1134
1135                 /* buffer the message to handle re-xmits */
1136                 dtls1_buffer_message(s, 0);
1137
1138                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1139                 }
1140
1141         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1142         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1143 err:
1144         return(-1);
1145         }
1146
1147 int dtls1_send_client_certificate(SSL *s)
1148         {
1149         X509 *x509=NULL;
1150         EVP_PKEY *pkey=NULL;
1151         int i;
1152         unsigned long l;
1153
1154         if (s->state == SSL3_ST_CW_CERT_A)
1155                 {
1156                 if ((s->cert == NULL) ||
1157                         (s->cert->key->x509 == NULL) ||
1158                         (s->cert->key->privatekey == NULL))
1159                         s->state=SSL3_ST_CW_CERT_B;
1160                 else
1161                         s->state=SSL3_ST_CW_CERT_C;
1162                 }
1163
1164         /* We need to get a client cert */
1165         if (s->state == SSL3_ST_CW_CERT_B)
1166                 {
1167                 /* If we get an error, we need to
1168                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1169                  * We then get retied later */
1170                 i=0;
1171                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1172                 if (i < 0)
1173                         {
1174                         s->rwstate=SSL_X509_LOOKUP;
1175                         return(-1);
1176                         }
1177                 s->rwstate=SSL_NOTHING;
1178                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1179                         {
1180                         s->state=SSL3_ST_CW_CERT_B;
1181                         if (    !SSL_use_certificate(s,x509) ||
1182                                 !SSL_use_PrivateKey(s,pkey))
1183                                 i=0;
1184                         }
1185                 else if (i == 1)
1186                         {
1187                         i=0;
1188                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1189                         }
1190
1191                 if (x509 != NULL) X509_free(x509);
1192                 if (pkey != NULL) EVP_PKEY_free(pkey);
1193                 if (i == 0)
1194                         {
1195                         if (s->version == SSL3_VERSION)
1196                                 {
1197                                 s->s3->tmp.cert_req=0;
1198                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1199                                 return(1);
1200                                 }
1201                         else
1202                                 {
1203                                 s->s3->tmp.cert_req=2;
1204                                 }
1205                         }
1206
1207                 /* Ok, we have a cert */
1208                 s->state=SSL3_ST_CW_CERT_C;
1209                 }
1210
1211         if (s->state == SSL3_ST_CW_CERT_C)
1212                 {
1213                 s->state=SSL3_ST_CW_CERT_D;
1214                 l=dtls1_output_cert_chain(s,
1215                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1216                 s->init_num=(int)l;
1217                 s->init_off=0;
1218
1219                 /* set header called by dtls1_output_cert_chain() */
1220
1221                 /* buffer the message to handle re-xmits */
1222                 dtls1_buffer_message(s, 0);
1223                 }
1224         /* SSL3_ST_CW_CERT_D */
1225         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1226         }
1227
1228