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(DTLSv1_client_method,
 143                         ssl_undefined_function,
 144                         dtls1_connect,
 145                         dtls1_get_client_method)
 146
 147 int dtls1_connect(SSL *s)
 148         {
 149         BUF_MEM *buf=NULL;
 150         unsigned long Time=(unsigned long)time(NULL);
 151         long num1;
 152         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 153         int ret= -1;
 154         int new_state,state,skip=0;;
 155
 156         RAND_add(&Time,sizeof(Time),0);
 157         ERR_clear_error();
 158         clear_sys_error();
 159
 160         if (s->info_callback != NULL)
 161                 cb=s->info_callback;
 162         else if (s->ctx->info_callback != NULL)
 163                 cb=s->ctx->info_callback;
 164
 165         s->in_handshake++;
 166         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 167
 168         for (;;)
 169                 {
 170                 state=s->state;
 171
 172                 switch(s->state)
 173                         {
 174                 case SSL_ST_RENEGOTIATE:
 175                         s->new_session=1;
 176                         s->state=SSL_ST_CONNECT;
 177                         s->ctx->stats.sess_connect_renegotiate++;
 178                         /* break */
 179                 case SSL_ST_BEFORE:
 180                 case SSL_ST_CONNECT:
 181                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 182                 case SSL_ST_OK|SSL_ST_CONNECT:
 183
 184                         s->server=0;
 185                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 186
 187                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
 188                             (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
 189                                 {
 190                                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 191                                 ret = -1;
 192                                 goto end;
 193                                 }
 194
 195                         /* s->version=SSL3_VERSION; */
 196                         s->type=SSL_ST_CONNECT;
 197
 198                         if (s->init_buf == NULL)
 199                                 {
 200                                 if ((buf=BUF_MEM_new()) == NULL)
 201                                         {
 202                                         ret= -1;
 203                                         goto end;
 204                                         }
 205                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 206                                         {
 207                                         ret= -1;
 208                                         goto end;
 209                                         }
 210                                 s->init_buf=buf;
 211                                 buf=NULL;
 212                                 }
 213
 214                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 215
 216                         /* setup buffing BIO */
 217                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 218
 219                         /* don't push the buffering BIO quite yet */
 220
 221                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 222                         s->ctx->stats.sess_connect++;
 223                         s->init_num=0;
 224                         /* mark client_random uninitialized */
 225                         memset(s->s3->client_random,0,sizeof(s->s3->client_random));
 226                         break;
 227
 228                 case SSL3_ST_CW_CLNT_HELLO_A:
 229                 case SSL3_ST_CW_CLNT_HELLO_B:
 230
 231                         s->shutdown=0;
 232
 233                         /* every DTLS ClientHello resets Finished MAC */
 234                         ssl3_init_finished_mac(s);
 235
 236                         dtls1_start_timer(s);
 237                         ret=dtls1_client_hello(s);
 238                         if (ret <= 0) goto end;
 239
 240                         if ( s->d1->send_cookie)
 241                                 {
 242                                 s->state=SSL3_ST_CW_FLUSH;
 243                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 244                                 }
 245                         else
 246                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 247
 248                         s->init_num=0;
 249
 250                         /* turn on buffering for the next lot of output */
 251                         if (s->bbio != s->wbio)
 252                                 s->wbio=BIO_push(s->bbio,s->wbio);
 253
 254                         break;
 255
 256                 case SSL3_ST_CR_SRVR_HELLO_A:
 257                 case SSL3_ST_CR_SRVR_HELLO_B:
 258                         ret=ssl3_get_server_hello(s);
 259                         if (ret <= 0) goto end;
 260                         else
 261                                 {
 262                                 dtls1_stop_timer(s);
 263                                 if (s->hit)
 264                                         s->state=SSL3_ST_CR_FINISHED_A;
 265                                 else
 266                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 267                                 }
 268                         s->init_num=0;
 269                         break;
 270
 271                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 272                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 273
 274                         ret = dtls1_get_hello_verify(s);
 275                         if ( ret <= 0)
 276                                 goto end;
 277                         dtls1_stop_timer(s);
 278                         if ( s->d1->send_cookie) /* start again, with a cookie */
 279                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 280                         else
 281                                 s->state = SSL3_ST_CR_CERT_A;
 282                         s->init_num = 0;
 283                         break;
 284
 285                 case SSL3_ST_CR_CERT_A:
 286                 case SSL3_ST_CR_CERT_B:
 287                         /* Check if it is anon DH or PSK */
 288                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 289                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 290                                 {
 291                                 ret=ssl3_get_server_certificate(s);
 292                                 if (ret <= 0) goto end;
 293                                 }
 294                         else
 295                                 skip=1;
 296                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 297                         s->init_num=0;
 298                         break;
 299
 300                 case SSL3_ST_CR_KEY_EXCH_A:
 301                 case SSL3_ST_CR_KEY_EXCH_B:
 302                         ret=ssl3_get_key_exchange(s);
 303                         if (ret <= 0) goto end;
 304                         s->state=SSL3_ST_CR_CERT_REQ_A;
 305                         s->init_num=0;
 306
 307                         /* at this point we check that we have the
 308                          * required stuff from the server */
 309                         if (!ssl3_check_cert_and_algorithm(s))
 310                                 {
 311                                 ret= -1;
 312                                 goto end;
 313                                 }
 314                         break;
 315
 316                 case SSL3_ST_CR_CERT_REQ_A:
 317                 case SSL3_ST_CR_CERT_REQ_B:
 318                         ret=ssl3_get_certificate_request(s);
 319                         if (ret <= 0) goto end;
 320                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 321                         s->init_num=0;
 322                         break;
 323
 324                 case SSL3_ST_CR_SRVR_DONE_A:
 325                 case SSL3_ST_CR_SRVR_DONE_B:
 326                         ret=ssl3_get_server_done(s);
 327                         if (ret <= 0) goto end;
 328                         if (s->s3->tmp.cert_req)
 329                                 s->state=SSL3_ST_CW_CERT_A;
 330                         else
 331                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 332                         s->init_num=0;
 333
 334                         break;
 335
 336                 case SSL3_ST_CW_CERT_A:
 337                 case SSL3_ST_CW_CERT_B:
 338                 case SSL3_ST_CW_CERT_C:
 339                 case SSL3_ST_CW_CERT_D:
 340                         dtls1_start_timer(s);
 341                         ret=dtls1_send_client_certificate(s);
 342                         if (ret <= 0) goto end;
 343                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 344                         s->init_num=0;
 345                         break;
 346
 347                 case SSL3_ST_CW_KEY_EXCH_A:
 348                 case SSL3_ST_CW_KEY_EXCH_B:
 349                         dtls1_start_timer(s);
 350                         ret=dtls1_send_client_key_exchange(s);
 351                         if (ret <= 0) goto end;
 352                         /* EAY EAY EAY need to check for DH fix cert
 353                          * sent back */
 354                         /* For TLS, cert_req is set to 2, so a cert chain
 355                          * of nothing is sent, but no verify packet is sent */
 356                         if (s->s3->tmp.cert_req == 1)
 357                                 {
 358                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 359                                 }
 360                         else
 361                                 {
 362                                 s->state=SSL3_ST_CW_CHANGE_A;
 363                                 s->s3->change_cipher_spec=0;
 364                                 }
 365
 366                         s->init_num=0;
 367                         break;
 368
 369                 case SSL3_ST_CW_CERT_VRFY_A:
 370                 case SSL3_ST_CW_CERT_VRFY_B:
 371                         dtls1_start_timer(s);
 372                         ret=dtls1_send_client_verify(s);
 373                         if (ret <= 0) goto end;
 374                         s->state=SSL3_ST_CW_CHANGE_A;
 375                         s->init_num=0;
 376                         s->s3->change_cipher_spec=0;
 377                         break;
 378
 379                 case SSL3_ST_CW_CHANGE_A:
 380                 case SSL3_ST_CW_CHANGE_B:
 381                         dtls1_start_timer(s);
 382                         ret=dtls1_send_change_cipher_spec(s,
 383                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 384                         if (ret <= 0) goto end;
 385                         s->state=SSL3_ST_CW_FINISHED_A;
 386                         s->init_num=0;
 387
 388                         s->session->cipher=s->s3->tmp.new_cipher;
 389 #ifdef OPENSSL_NO_COMP
 390                         s->session->compress_meth=0;
 391 #else
 392                         if (s->s3->tmp.new_compression == NULL)
 393                                 s->session->compress_meth=0;
 394                         else
 395                                 s->session->compress_meth=
 396                                         s->s3->tmp.new_compression->id;
 397 #endif
 398                         if (!s->method->ssl3_enc->setup_key_block(s))
 399                                 {
 400                                 ret= -1;
 401                                 goto end;
 402                                 }
 403
 404                         if (!s->method->ssl3_enc->change_cipher_state(s,
 405                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 406                                 {
 407                                 ret= -1;
 408                                 goto end;
 409                                 }
 410
 411                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 412                         break;
 413
 414                 case SSL3_ST_CW_FINISHED_A:
 415                 case SSL3_ST_CW_FINISHED_B:
 416                         dtls1_start_timer(s);
 417                         ret=dtls1_send_finished(s,
 418                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 419                                 s->method->ssl3_enc->client_finished_label,
 420                                 s->method->ssl3_enc->client_finished_label_len);
 421                         if (ret <= 0) goto end;
 422                         s->state=SSL3_ST_CW_FLUSH;
 423
 424                         /* clear flags */
 425                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 426                         if (s->hit)
 427                                 {
 428                                 s->s3->tmp.next_state=SSL_ST_OK;
 429                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 430                                         {
 431                                         s->state=SSL_ST_OK;
 432                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 433                                         s->s3->delay_buf_pop_ret=0;
 434                                         }
 435                                 }
 436                         else
 437                                 {
 438                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 439                                 }
 440                         s->init_num=0;
 441                         break;
 442
 443                 case SSL3_ST_CR_FINISHED_A:
 444                 case SSL3_ST_CR_FINISHED_B:
 445
 446                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 447                                 SSL3_ST_CR_FINISHED_B);
 448                         if (ret <= 0) goto end;
 449                         dtls1_stop_timer(s);
 450
 451                         if (s->hit)
 452                                 s->state=SSL3_ST_CW_CHANGE_A;
 453                         else
 454                                 s->state=SSL_ST_OK;
 455                         s->init_num=0;
 456                         break;
 457
 458                 case SSL3_ST_CW_FLUSH:
 459                         /* number of bytes to be flushed */
 460                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 461                         if (num1 > 0)
 462                                 {
 463                                 s->rwstate=SSL_WRITING;
 464                                 num1=BIO_flush(s->wbio);
 465                                 if (num1 <= 0) { ret= -1; goto end; }
 466                                 s->rwstate=SSL_NOTHING;
 467                                 }
 468
 469                         s->state=s->s3->tmp.next_state;
 470                         break;
 471
 472                 case SSL_ST_OK:
 473                         /* clean a few things up */
 474                         ssl3_cleanup_key_block(s);
 475
 476 #if 0
 477                         if (s->init_buf != NULL)
 478                                 {
 479                                 BUF_MEM_free(s->init_buf);
 480                                 s->init_buf=NULL;
 481                                 }
 482 #endif
 483
 484                         /* If we are not 'joining' the last two packets,
 485                          * remove the buffering now */
 486                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 487                                 ssl_free_wbio_buffer(s);
 488                         /* else do it later in ssl3_write */
 489
 490                         s->init_num=0;
 491                         s->new_session=0;
 492
 493                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 494                         if (s->hit) s->ctx->stats.sess_hit++;
 495
 496                         ret=1;
 497                         /* s->server=0; */
 498                         s->handshake_func=dtls1_connect;
 499                         s->ctx->stats.sess_connect_good++;
 500
 501                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 502
 503                         /* done with handshaking */
 504                         s->d1->handshake_read_seq  = 0;
 505                         s->d1->next_handshake_write_seq = 0;
 506                         goto end;
 507                         /* break; */
 508
 509                 default:
 510                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 511                         ret= -1;
 512                         goto end;
 513                         /* break; */
 514                         }
 515
 516                 /* did we do anything */
 517                 if (!s->s3->tmp.reuse_message && !skip)
 518                         {
 519                         if (s->debug)
 520                                 {
 521                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 522                                         goto end;
 523                                 }
 524
 525                         if ((cb != NULL) && (s->state != state))
 526                                 {
 527                                 new_state=s->state;
 528                                 s->state=state;
 529                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 530                                 s->state=new_state;
 531                                 }
 532                         }
 533                 skip=0;
 534                 }
 535 end:
 536         s->in_handshake--;
 537         if (buf != NULL)
 538                 BUF_MEM_free(buf);
 539         if (cb != NULL)
 540                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 541         return(ret);
 542         }
 543
 544 int dtls1_client_hello(SSL *s)
 545         {
 546         unsigned char *buf;
 547         unsigned char *p,*d;
 548         unsigned int i,j;
 549         unsigned long Time,l;
 550         SSL_COMP *comp;
 551
 552         buf=(unsigned char *)s->init_buf->data;
 553         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 554                 {
 555                 if ((s->session == NULL) ||
 556                         (s->session->ssl_version != s->version) ||
 557                         (s->session->not_resumable))
 558                         {
 559                         if (!ssl_get_new_session(s,0))
 560                                 goto err;
 561                         }
 562                 /* else use the pre-loaded session */
 563
 564                 p=s->s3->client_random;
 565
 566                 /* if client_random is initialized, reuse it, we are
 567                  * required to use same upon reply to HelloVerify */
 568                 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
 569                 if (i==sizeof(s->s3->client_random))
 570                         {
 571                         Time=(unsigned long)time(NULL); /* Time */
 572                         l2n(Time,p);
 573                         RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4);
 574                         }
 575
 576                 /* Do the message type and length last */
 577                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 578
 579                 *(p++)=s->version>>8;
 580                 *(p++)=s->version&0xff;
 581                 s->client_version=s->version;
 582
 583                 /* Random stuff */
 584                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 585                 p+=SSL3_RANDOM_SIZE;
 586
 587                 /* Session ID */
 588                 if (s->new_session)
 589                         i=0;
 590                 else
 591                         i=s->session->session_id_length;
 592                 *(p++)=i;
 593                 if (i != 0)
 594                         {
 595                         if (i > sizeof s->session->session_id)
 596                                 {
 597                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 598                                 goto err;
 599                                 }
 600                         memcpy(p,s->session->session_id,i);
 601                         p+=i;
 602                         }
 603
 604                 /* cookie stuff */
 605                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 606                         {
 607                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 608                         goto err;
 609                         }
 610                 *(p++) = s->d1->cookie_len;
 611                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 612                 p += s->d1->cookie_len;
 613
 614                 /* Ciphers supported */
 615                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 616                 if (i == 0)
 617                         {
 618                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 619                         goto err;
 620                         }
 621                 s2n(i,p);
 622                 p+=i;
 623
 624                 /* COMPRESSION */
 625                 if (s->ctx->comp_methods == NULL)
 626                         j=0;
 627                 else
 628                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 629                 *(p++)=1+j;
 630                 for (i=0; i<j; i++)
 631                         {
 632                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 633                         *(p++)=comp->id;
 634                         }
 635                 *(p++)=0; /* Add the NULL method */
 636
 637                 l=(p-d);
 638                 d=buf;
 639
 640                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 641
 642                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 643                 /* number of bytes to write */
 644                 s->init_num=p-buf;
 645                 s->init_off=0;
 646
 647                 /* buffer the message to handle re-xmits */
 648                 dtls1_buffer_message(s, 0);
 649                 }
 650
 651         /* SSL3_ST_CW_CLNT_HELLO_B */
 652         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 653 err:
 654         return(-1);
 655         }
 656
 657 static int dtls1_get_hello_verify(SSL *s)
 658         {
 659         int n, al, ok = 0;
 660         unsigned char *data;
 661         unsigned int cookie_len;
 662
 663         n=s->method->ssl_get_message(s,
 664                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 665                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 666                 -1,
 667                 s->max_cert_list,
 668                 &ok);
 669
 670         if (!ok) return((int)n);
 671
 672         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 673                 {
 674                 s->d1->send_cookie = 0;
 675                 s->s3->tmp.reuse_message=1;
 676                 return(1);
 677                 }
 678
 679         data = (unsigned char *)s->init_msg;
 680
 681         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 682                 {
 683                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 684                 s->version=(s->version&0xff00)|data[1];
 685                 al = SSL_AD_PROTOCOL_VERSION;
 686                 goto f_err;
 687                 }
 688         data+=2;
 689
 690         cookie_len = *(data++);
 691         if ( cookie_len > sizeof(s->d1->cookie))
 692                 {
 693                 al=SSL_AD_ILLEGAL_PARAMETER;
 694                 goto f_err;
 695                 }
 696
 697         memcpy(s->d1->cookie, data, cookie_len);
 698         s->d1->cookie_len = cookie_len;
 699
 700         s->d1->send_cookie = 1;
 701         return 1;
 702
 703 f_err:
 704         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 705         return -1;
 706         }
 707
 708 int dtls1_send_client_key_exchange(SSL *s)
 709         {
 710         unsigned char *p,*d;
 711         int n;
 712         unsigned long alg_k;
 713 #ifndef OPENSSL_NO_RSA
 714         unsigned char *q;
 715         EVP_PKEY *pkey=NULL;
 716 #endif
 717 #ifndef OPENSSL_NO_KRB5
 718         KSSL_ERR kssl_err;
 719 #endif /* OPENSSL_NO_KRB5 */
 720 #ifndef OPENSSL_NO_ECDH
 721         EC_KEY *clnt_ecdh = NULL;
 722         const EC_POINT *srvr_ecpoint = NULL;
 723         EVP_PKEY *srvr_pub_pkey = NULL;
 724         unsigned char *encodedPoint = NULL;
 725         int encoded_pt_len = 0;
 726         BN_CTX * bn_ctx = NULL;
 727 #endif
 728
 729         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
 730                 {
 731                 d=(unsigned char *)s->init_buf->data;
 732                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 733
 734                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
 735
 736                 /* Fool emacs indentation */
 737                 if (0) {}
 738 #ifndef OPENSSL_NO_RSA
 739                 else if (alg_k & SSL_kRSA)
 740                         {
 741                         RSA *rsa;
 742                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 743
 744                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
 745                                 rsa=s->session->sess_cert->peer_rsa_tmp;
 746                         else
 747                                 {
 748                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 749                                 if ((pkey == NULL) ||
 750                                         (pkey->type != EVP_PKEY_RSA) ||
 751                                         (pkey->pkey.rsa == NULL))
 752                                         {
 753                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 754                                         goto err;
 755                                         }
 756                                 rsa=pkey->pkey.rsa;
 757                                 EVP_PKEY_free(pkey);
 758                                 }
 759
 760                         tmp_buf[0]=s->client_version>>8;
 761                         tmp_buf[1]=s->client_version&0xff;
 762                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
 763                                         goto err;
 764
 765                         s->session->master_key_length=sizeof tmp_buf;
 766
 767                         q=p;
 768                         /* Fix buf for TLS and [incidentally] DTLS */
 769                         if (s->version > SSL3_VERSION)
 770                                 p+=2;
 771                         n=RSA_public_encrypt(sizeof tmp_buf,
 772                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
 773 #ifdef PKCS1_CHECK
 774                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
 775                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
 776 #endif
 777                         if (n <= 0)
 778                                 {
 779                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
 780                                 goto err;
 781                                 }
 782
 783                         /* Fix buf for TLS and [incidentally] DTLS */
 784                         if (s->version > SSL3_VERSION)
 785                                 {
 786                                 s2n(n,q);
 787                                 n+=2;
 788                                 }
 789
 790                         s->session->master_key_length=
 791                                 s->method->ssl3_enc->generate_master_secret(s,
 792                                         s->session->master_key,
 793                                         tmp_buf,sizeof tmp_buf);
 794                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
 795                         }
 796 #endif
 797 #ifndef OPENSSL_NO_KRB5
 798                 else if (alg_k & SSL_kKRB5)
 799                         {
 800                         krb5_error_code krb5rc;
 801                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
 802                         /*  krb5_data   krb5_ap_req;  */
 803                         krb5_data       *enc_ticket;
 804                         krb5_data       authenticator, *authp = NULL;
 805                         EVP_CIPHER_CTX  ciph_ctx;
 806                         const EVP_CIPHER *enc = NULL;
 807                         unsigned char   iv[EVP_MAX_IV_LENGTH];
 808                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 809                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
 810                                                 + EVP_MAX_IV_LENGTH];
 811                         int             padl, outl = sizeof(epms);
 812
 813                         EVP_CIPHER_CTX_init(&ciph_ctx);
 814
 815 #ifdef KSSL_DEBUG
 816                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
 817                                 alg_k, SSL_kKRB5);
 818 #endif  /* KSSL_DEBUG */
 819
 820                         authp = NULL;
 821 #ifdef KRB5SENDAUTH
 822                         if (KRB5SENDAUTH)  authp = &authenticator;
 823 #endif  /* KRB5SENDAUTH */
 824
 825                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
 826                                 &kssl_err);
 827                         enc = kssl_map_enc(kssl_ctx->enctype);
 828                         if (enc == NULL)
 829                             goto err;
 830 #ifdef KSSL_DEBUG
 831                         {
 832                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
 833                         if (krb5rc && kssl_err.text)
 834                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
 835                         }
 836 #endif  /* KSSL_DEBUG */
 837
 838                         if (krb5rc)
 839                                 {
 840                                 ssl3_send_alert(s,SSL3_AL_FATAL,
 841                                                 SSL_AD_HANDSHAKE_FAILURE);
 842                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 843                                                 kssl_err.reason);
 844                                 goto err;
 845                                 }
 846
 847                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
 848                         **  in place of RFC 2712 KerberosWrapper, as in:
 849                         **
 850                         **  Send ticket (copy to *p, set n = length)
 851                         **  n = krb5_ap_req.length;
 852                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
 853                         **  if (krb5_ap_req.data)
 854                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
 855                         **
 856                         **  Now using real RFC 2712 KerberosWrapper
 857                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
 858                         **  Note: 2712 "opaque" types are here replaced
 859                         **  with a 2-byte length followed by the value.
 860                         **  Example:
 861                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
 862                         **  Where "xx xx" = length bytes.  Shown here with
 863                         **  optional authenticator omitted.
 864                         */
 865
 866                         /*  KerberosWrapper.Ticket              */
 867                         s2n(enc_ticket->length,p);
 868                         memcpy(p, enc_ticket->data, enc_ticket->length);
 869                         p+= enc_ticket->length;
 870                         n = enc_ticket->length + 2;
 871
 872                         /*  KerberosWrapper.Authenticator       */
 873                         if (authp  &&  authp->length)
 874                                 {
 875                                 s2n(authp->length,p);
 876                                 memcpy(p, authp->data, authp->length);
 877                                 p+= authp->length;
 878                                 n+= authp->length + 2;
 879
 880                                 free(authp->data);
 881                                 authp->data = NULL;
 882                                 authp->length = 0;
 883                                 }
 884                         else
 885                                 {
 886                                 s2n(0,p);/*  null authenticator length  */
 887                                 n+=2;
 888                                 }
 889
 890                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
 891                             goto err;
 892
 893                         /*  20010420 VRS.  Tried it this way; failed.
 894                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
 895                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
 896                         **                              kssl_ctx->length);
 897                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
 898                         */
 899
 900                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
 901                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
 902                                 kssl_ctx->key,iv);
 903                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
 904                                 sizeof tmp_buf);
 905                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
 906                         outl += padl;
 907                         if (outl > (int)sizeof epms)
 908                                 {
 909                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 910                                 goto err;
 911                                 }
 912                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
 913
 914                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
 915                         s2n(outl,p);
 916                         memcpy(p, epms, outl);
 917                         p+=outl;
 918                         n+=outl + 2;
 919
 920                         s->session->master_key_length=
 921                                 s->method->ssl3_enc->generate_master_secret(s,
 922                                         s->session->master_key,
 923                                         tmp_buf, sizeof tmp_buf);
 924
 925                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
 926                         OPENSSL_cleanse(epms, outl);
 927                         }
 928 #endif
 929 #ifndef OPENSSL_NO_DH
 930                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 931                         {
 932                         DH *dh_srvr,*dh_clnt;
 933
 934                         if (s->session->sess_cert->peer_dh_tmp != NULL)
 935                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
 936                         else
 937                                 {
 938                                 /* we get them from the cert */
 939                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 940                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
 941                                 goto err;
 942                                 }
 943
 944                         /* generate a new random key */
 945                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
 946                                 {
 947                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 948                                 goto err;
 949                                 }
 950                         if (!DH_generate_key(dh_clnt))
 951                                 {
 952                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 953                                 goto err;
 954                                 }
 955
 956                         /* use the 'p' output buffer for the DH key, but
 957                          * make sure to clear it out afterwards */
 958
 959                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
 960
 961                         if (n <= 0)
 962                                 {
 963                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 964                                 goto err;
 965                                 }
 966
 967                         /* generate master key from the result */
 968                         s->session->master_key_length=
 969                                 s->method->ssl3_enc->generate_master_secret(s,
 970                                         s->session->master_key,p,n);
 971                         /* clean up */
 972                         memset(p,0,n);
 973
 974                         /* send off the data */
 975                         n=BN_num_bytes(dh_clnt->pub_key);
 976                         s2n(n,p);
 977                         BN_bn2bin(dh_clnt->pub_key,p);
 978                         n+=2;
 979
 980                         DH_free(dh_clnt);
 981
 982                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
 983                         }
 984 #endif
 985 #ifndef OPENSSL_NO_ECDH
 986                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
 987                         {
 988                         const EC_GROUP *srvr_group = NULL;
 989                         EC_KEY *tkey;
 990                         int ecdh_clnt_cert = 0;
 991                         int field_size = 0;
 992
 993                         /* Did we send out the client's
 994                          * ECDH share for use in premaster
 995                          * computation as part of client certificate?
 996                          * If so, set ecdh_clnt_cert to 1.
 997                          */
 998                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
 999                                 {
1000                                 /* XXX: For now, we do not support client
1001                                  * authentication using ECDH certificates.
1002                                  * To add such support, one needs to add
1003                                  * code that checks for appropriate
1004                                  * conditions and sets ecdh_clnt_cert to 1.
1005                                  * For example, the cert have an ECC
1006                                  * key on the same curve as the server's
1007                                  * and the key should be authorized for
1008                                  * key agreement.
1009                                  *
1010                                  * One also needs to add code in ssl3_connect
1011                                  * to skip sending the certificate verify
1012                                  * message.
1013                                  *
1014                                  * if ((s->cert->key->privatekey != NULL) &&
1015                                  *     (s->cert->key->privatekey->type ==
1016                                  *      EVP_PKEY_EC) && ...)
1017                                  * ecdh_clnt_cert = 1;
1018                                  */
1019                                 }
1020
1021                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1022                                 {
1023                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
1024                                 }
1025                         else
1026                                 {
1027                                 /* Get the Server Public Key from Cert */
1028                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1029                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1030                                 if ((srvr_pub_pkey == NULL) ||
1031                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1032                                     (srvr_pub_pkey->pkey.ec == NULL))
1033                                         {
1034                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1035                                             ERR_R_INTERNAL_ERROR);
1036                                         goto err;
1037                                         }
1038
1039                                 tkey = srvr_pub_pkey->pkey.ec;
1040                                 }
1041
1042                         srvr_group   = EC_KEY_get0_group(tkey);
1043                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1044
1045                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1046                                 {
1047                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1048                                     ERR_R_INTERNAL_ERROR);
1049                                 goto err;
1050                                 }
1051
1052                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
1053                                 {
1054                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1055                                 goto err;
1056                                 }
1057
1058                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
1059                                 {
1060                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1061                                 goto err;
1062                                 }
1063                         if (ecdh_clnt_cert)
1064                                 {
1065                                 /* Reuse key info from our certificate
1066                                  * We only need our private key to perform
1067                                  * the ECDH computation.
1068                                  */
1069                                 const BIGNUM *priv_key;
1070                                 tkey = s->cert->key->privatekey->pkey.ec;
1071                                 priv_key = EC_KEY_get0_private_key(tkey);
1072                                 if (priv_key == NULL)
1073                                         {
1074                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1075                                         goto err;
1076                                         }
1077                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
1078                                         {
1079                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1080                                         goto err;
1081                                         }
1082                                 }
1083                         else
1084                                 {
1085                                 /* Generate a new ECDH key pair */
1086                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
1087                                         {
1088                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1089                                         goto err;
1090                                         }
1091                                 }
1092
1093                         /* use the 'p' output buffer for the ECDH key, but
1094                          * make sure to clear it out afterwards
1095                          */
1096
1097                         field_size = EC_GROUP_get_degree(srvr_group);
1098                         if (field_size <= 0)
1099                                 {
1100                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1101                                        ERR_R_ECDH_LIB);
1102                                 goto err;
1103                                 }
1104                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1105                         if (n <= 0)
1106                                 {
1107                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1108                                        ERR_R_ECDH_LIB);
1109                                 goto err;
1110                                 }
1111
1112                         /* generate master key from the result */
1113                         s->session->master_key_length = s->method->ssl3_enc \
1114                             -> generate_master_secret(s,
1115                                 s->session->master_key,
1116                                 p, n);
1117
1118                         memset(p, 0, n); /* clean up */
1119
1120                         if (ecdh_clnt_cert)
1121                                 {
1122                                 /* Send empty client key exch message */
1123                                 n = 0;
1124                                 }
1125                         else
1126                                 {
1127                                 /* First check the size of encoding and
1128                                  * allocate memory accordingly.
1129                                  */
1130                                 encoded_pt_len =
1131                                     EC_POINT_point2oct(srvr_group,
1132                                         EC_KEY_get0_public_key(clnt_ecdh),
1133                                         POINT_CONVERSION_UNCOMPRESSED,
1134                                         NULL, 0, NULL);
1135
1136                                 encodedPoint = (unsigned char *)
1137                                     OPENSSL_malloc(encoded_pt_len *
1138                                         sizeof(unsigned char));
1139                                 bn_ctx = BN_CTX_new();
1140                                 if ((encodedPoint == NULL) ||
1141                                     (bn_ctx == NULL))
1142                                         {
1143                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1144                                         goto err;
1145                                         }
1146
1147                                 /* Encode the public key */
1148                                 n = EC_POINT_point2oct(srvr_group,
1149                                     EC_KEY_get0_public_key(clnt_ecdh),
1150                                     POINT_CONVERSION_UNCOMPRESSED,
1151                                     encodedPoint, encoded_pt_len, bn_ctx);
1152
1153                                 *p = n; /* length of encoded point */
1154                                 /* Encoded point will be copied here */
1155                                 p += 1;
1156                                 /* copy the point */
1157                                 memcpy((unsigned char *)p, encodedPoint, n);
1158                                 /* increment n to account for length field */
1159                                 n += 1;
1160                                 }
1161
1162                         /* Free allocated memory */
1163                         BN_CTX_free(bn_ctx);
1164                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1165                         if (clnt_ecdh != NULL)
1166                                  EC_KEY_free(clnt_ecdh);
1167                         EVP_PKEY_free(srvr_pub_pkey);
1168                         }
1169 #endif /* !OPENSSL_NO_ECDH */
1170
1171 #ifndef OPENSSL_NO_PSK
1172                 else if (alg_k & SSL_kPSK)
1173                         {
1174                         char identity[PSK_MAX_IDENTITY_LEN];
1175                         unsigned char *t = NULL;
1176                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
1177                         unsigned int pre_ms_len = 0, psk_len = 0;
1178                         int psk_err = 1;
1179
1180                         n = 0;
1181                         if (s->psk_client_callback == NULL)
1182                                 {
1183                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1184                                         SSL_R_PSK_NO_CLIENT_CB);
1185                                 goto err;
1186                                 }
1187
1188                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
1189                                 identity, PSK_MAX_IDENTITY_LEN,
1190                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
1191                         if (psk_len > PSK_MAX_PSK_LEN)
1192                                 {
1193                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1194                                         ERR_R_INTERNAL_ERROR);
1195                                 goto psk_err;
1196                                 }
1197                         else if (psk_len == 0)
1198                                 {
1199                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1200                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
1201                                 goto psk_err;
1202                                 }
1203
1204                         /* create PSK pre_master_secret */
1205                         pre_ms_len = 2+psk_len+2+psk_len;
1206                         t = psk_or_pre_ms;
1207                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
1208                         s2n(psk_len, t);
1209                         memset(t, 0, psk_len);
1210                         t+=psk_len;
1211                         s2n(psk_len, t);
1212
1213                         if (s->session->psk_identity_hint != NULL)
1214                                 OPENSSL_free(s->session->psk_identity_hint);
1215                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
1216                         if (s->ctx->psk_identity_hint != NULL &&
1217                                 s->session->psk_identity_hint == NULL)
1218                                 {
1219                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1220                                         ERR_R_MALLOC_FAILURE);
1221                                 goto psk_err;
1222                                 }
1223
1224                         if (s->session->psk_identity != NULL)
1225                                 OPENSSL_free(s->session->psk_identity);
1226                         s->session->psk_identity = BUF_strdup(identity);
1227                         if (s->session->psk_identity == NULL)
1228                                 {
1229                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1230                                         ERR_R_MALLOC_FAILURE);
1231                                 goto psk_err;
1232                                 }
1233
1234                         s->session->master_key_length =
1235                                 s->method->ssl3_enc->generate_master_secret(s,
1236                                         s->session->master_key,
1237                                         psk_or_pre_ms, pre_ms_len);
1238                         n = strlen(identity);
1239                         s2n(n, p);
1240                         memcpy(p, identity, n);
1241                         n+=2;
1242                         psk_err = 0;
1243                 psk_err:
1244                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
1245                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
1246                         if (psk_err != 0)
1247                                 {
1248                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1249                                 goto err;
1250                                 }
1251                         }
1252 #endif
1253                 else
1254                         {
1255                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1256                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1257                         goto err;
1258                         }
1259
1260                 d = dtls1_set_message_header(s, d,
1261                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1262                 /*
1263                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1264                  l2n3(n,d);
1265                  l2n(s->d1->handshake_write_seq,d);
1266                  s->d1->handshake_write_seq++;
1267                 */
1268
1269                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1270                 /* number of bytes to write */
1271                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1272                 s->init_off=0;
1273
1274                 /* buffer the message to handle re-xmits */
1275                 dtls1_buffer_message(s, 0);
1276                 }
1277
1278         /* SSL3_ST_CW_KEY_EXCH_B */
1279         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1280 err:
1281 #ifndef OPENSSL_NO_ECDH
1282         BN_CTX_free(bn_ctx);
1283         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1284         if (clnt_ecdh != NULL)
1285                 EC_KEY_free(clnt_ecdh);
1286         EVP_PKEY_free(srvr_pub_pkey);
1287 #endif
1288         return(-1);
1289         }
1290
1291 int dtls1_send_client_verify(SSL *s)
1292         {
1293         unsigned char *p,*d;
1294         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1295         EVP_PKEY *pkey;
1296 #ifndef OPENSSL_NO_RSA
1297         unsigned u=0;
1298 #endif
1299         unsigned long n;
1300 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
1301         int j;
1302 #endif
1303
1304         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1305                 {
1306                 d=(unsigned char *)s->init_buf->data;
1307                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1308                 pkey=s->cert->key->privatekey;
1309
1310                 s->method->ssl3_enc->cert_verify_mac(s,
1311                 NID_sha1,
1312                         &(data[MD5_DIGEST_LENGTH]));
1313
1314 #ifndef OPENSSL_NO_RSA
1315                 if (pkey->type == EVP_PKEY_RSA)
1316                         {
1317                         s->method->ssl3_enc->cert_verify_mac(s,
1318                                 NID_md5,
1319                                 &(data[0]));
1320                         if (RSA_sign(NID_md5_sha1, data,
1321                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1322                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1323                                 {
1324                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1325                                 goto err;
1326                                 }
1327                         s2n(u,p);
1328                         n=u+2;
1329                         }
1330                 else
1331 #endif
1332 #ifndef OPENSSL_NO_DSA
1333                         if (pkey->type == EVP_PKEY_DSA)
1334                         {
1335                         if (!DSA_sign(pkey->save_type,
1336                                 &(data[MD5_DIGEST_LENGTH]),
1337                                 SHA_DIGEST_LENGTH,&(p[2]),
1338                                 (unsigned int *)&j,pkey->pkey.dsa))
1339                                 {
1340                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1341                                 goto err;
1342                                 }
1343                         s2n(j,p);
1344                         n=j+2;
1345                         }
1346                 else
1347 #endif
1348 #ifndef OPENSSL_NO_ECDSA
1349                         if (pkey->type == EVP_PKEY_EC)
1350                         {
1351                         if (!ECDSA_sign(pkey->save_type,
1352                                 &(data[MD5_DIGEST_LENGTH]),
1353                                 SHA_DIGEST_LENGTH,&(p[2]),
1354                                 (unsigned int *)&j,pkey->pkey.ec))
1355                                 {
1356                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
1357                                     ERR_R_ECDSA_LIB);
1358                                 goto err;
1359                                 }
1360                         s2n(j,p);
1361                         n=j+2;
1362                         }
1363                 else
1364 #endif
1365                         {
1366                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1367                         goto err;
1368                         }
1369
1370                 d = dtls1_set_message_header(s, d,
1371                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1372
1373                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1374                 s->init_off=0;
1375
1376                 /* buffer the message to handle re-xmits */
1377                 dtls1_buffer_message(s, 0);
1378
1379                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1380                 }
1381
1382         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1383         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1384 err:
1385         return(-1);
1386         }
1387
1388 int dtls1_send_client_certificate(SSL *s)
1389         {
1390         X509 *x509=NULL;
1391         EVP_PKEY *pkey=NULL;
1392         int i;
1393         unsigned long l;
1394
1395         if (s->state == SSL3_ST_CW_CERT_A)
1396                 {
1397                 if ((s->cert == NULL) ||
1398                         (s->cert->key->x509 == NULL) ||
1399                         (s->cert->key->privatekey == NULL))
1400                         s->state=SSL3_ST_CW_CERT_B;
1401                 else
1402                         s->state=SSL3_ST_CW_CERT_C;
1403                 }
1404
1405         /* We need to get a client cert */
1406         if (s->state == SSL3_ST_CW_CERT_B)
1407                 {
1408                 /* If we get an error, we need to
1409                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1410                  * We then get retied later */
1411                 i=0;
1412                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1413                 if (i < 0)
1414                         {
1415                         s->rwstate=SSL_X509_LOOKUP;
1416                         return(-1);
1417                         }
1418                 s->rwstate=SSL_NOTHING;
1419                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1420                         {
1421                         s->state=SSL3_ST_CW_CERT_B;
1422                         if (    !SSL_use_certificate(s,x509) ||
1423                                 !SSL_use_PrivateKey(s,pkey))
1424                                 i=0;
1425                         }
1426                 else if (i == 1)
1427                         {
1428                         i=0;
1429                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1430                         }
1431
1432                 if (x509 != NULL) X509_free(x509);
1433                 if (pkey != NULL) EVP_PKEY_free(pkey);
1434                 if (i == 0)
1435                         {
1436                         if (s->version == SSL3_VERSION)
1437                                 {
1438                                 s->s3->tmp.cert_req=0;
1439                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1440                                 return(1);
1441                                 }
1442                         else
1443                                 {
1444                                 s->s3->tmp.cert_req=2;
1445                                 }
1446                         }
1447
1448                 /* Ok, we have a cert */
1449                 s->state=SSL3_ST_CW_CERT_C;
1450                 }
1451
1452         if (s->state == SSL3_ST_CW_CERT_C)
1453                 {
1454                 s->state=SSL3_ST_CW_CERT_D;
1455                 l=dtls1_output_cert_chain(s,
1456                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1457                 s->init_num=(int)l;
1458                 s->init_off=0;
1459
1460                 /* set header called by dtls1_output_cert_chain() */
1461
1462                 /* buffer the message to handle re-xmits */
1463                 dtls1_buffer_message(s, 0);
1464                 }
1465         /* SSL3_ST_CW_CERT_D */
1466         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1467         }
1468
1469