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                         s->d1->send_cookie = 0;
 227                         s->hit = 0;
 228                         break;
 229
 230                 case SSL3_ST_CW_CLNT_HELLO_A:
 231                 case SSL3_ST_CW_CLNT_HELLO_B:
 232
 233                         s->shutdown=0;
 234
 235                         /* every DTLS ClientHello resets Finished MAC */
 236                         ssl3_init_finished_mac(s);
 237
 238                         dtls1_start_timer(s);
 239                         ret=dtls1_client_hello(s);
 240                         if (ret <= 0) goto end;
 241
 242                         if ( s->d1->send_cookie)
 243                                 {
 244                                 s->state=SSL3_ST_CW_FLUSH;
 245                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 246                                 }
 247                         else
 248                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 249
 250                         s->init_num=0;
 251
 252                         /* turn on buffering for the next lot of output */
 253                         if (s->bbio != s->wbio)
 254                                 s->wbio=BIO_push(s->bbio,s->wbio);
 255
 256                         break;
 257
 258                 case SSL3_ST_CR_SRVR_HELLO_A:
 259                 case SSL3_ST_CR_SRVR_HELLO_B:
 260                         ret=ssl3_get_server_hello(s);
 261                         if (ret <= 0) goto end;
 262                         else
 263                                 {
 264                                 dtls1_stop_timer(s);
 265                                 if (s->hit)
 266                                         s->state=SSL3_ST_CR_FINISHED_A;
 267                                 else
 268                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 269                                 }
 270                         s->init_num=0;
 271                         break;
 272
 273                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 274                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 275
 276                         ret = dtls1_get_hello_verify(s);
 277                         if ( ret <= 0)
 278                                 goto end;
 279                         dtls1_stop_timer(s);
 280                         if ( s->d1->send_cookie) /* start again, with a cookie */
 281                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 282                         else
 283                                 s->state = SSL3_ST_CR_CERT_A;
 284                         s->init_num = 0;
 285                         break;
 286
 287                 case SSL3_ST_CR_CERT_A:
 288                 case SSL3_ST_CR_CERT_B:
 289                         /* Check if it is anon DH or PSK */
 290                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 291                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 292                                 {
 293                                 ret=ssl3_get_server_certificate(s);
 294                                 if (ret <= 0) goto end;
 295                                 }
 296                         else
 297                                 skip=1;
 298                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 299                         s->init_num=0;
 300                         break;
 301
 302                 case SSL3_ST_CR_KEY_EXCH_A:
 303                 case SSL3_ST_CR_KEY_EXCH_B:
 304                         ret=ssl3_get_key_exchange(s);
 305                         if (ret <= 0) goto end;
 306                         s->state=SSL3_ST_CR_CERT_REQ_A;
 307                         s->init_num=0;
 308
 309                         /* at this point we check that we have the
 310                          * required stuff from the server */
 311                         if (!ssl3_check_cert_and_algorithm(s))
 312                                 {
 313                                 ret= -1;
 314                                 goto end;
 315                                 }
 316                         break;
 317
 318                 case SSL3_ST_CR_CERT_REQ_A:
 319                 case SSL3_ST_CR_CERT_REQ_B:
 320                         ret=ssl3_get_certificate_request(s);
 321                         if (ret <= 0) goto end;
 322                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 323                         s->init_num=0;
 324                         break;
 325
 326                 case SSL3_ST_CR_SRVR_DONE_A:
 327                 case SSL3_ST_CR_SRVR_DONE_B:
 328                         ret=ssl3_get_server_done(s);
 329                         if (ret <= 0) goto end;
 330                         if (s->s3->tmp.cert_req)
 331                                 s->state=SSL3_ST_CW_CERT_A;
 332                         else
 333                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 334                         s->init_num=0;
 335
 336                         break;
 337
 338                 case SSL3_ST_CW_CERT_A:
 339                 case SSL3_ST_CW_CERT_B:
 340                 case SSL3_ST_CW_CERT_C:
 341                 case SSL3_ST_CW_CERT_D:
 342                         dtls1_start_timer(s);
 343                         ret=dtls1_send_client_certificate(s);
 344                         if (ret <= 0) goto end;
 345                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 346                         s->init_num=0;
 347                         break;
 348
 349                 case SSL3_ST_CW_KEY_EXCH_A:
 350                 case SSL3_ST_CW_KEY_EXCH_B:
 351                         dtls1_start_timer(s);
 352                         ret=dtls1_send_client_key_exchange(s);
 353                         if (ret <= 0) goto end;
 354                         /* EAY EAY EAY need to check for DH fix cert
 355                          * sent back */
 356                         /* For TLS, cert_req is set to 2, so a cert chain
 357                          * of nothing is sent, but no verify packet is sent */
 358                         if (s->s3->tmp.cert_req == 1)
 359                                 {
 360                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 361                                 }
 362                         else
 363                                 {
 364                                 s->state=SSL3_ST_CW_CHANGE_A;
 365                                 s->s3->change_cipher_spec=0;
 366                                 }
 367
 368                         s->init_num=0;
 369                         break;
 370
 371                 case SSL3_ST_CW_CERT_VRFY_A:
 372                 case SSL3_ST_CW_CERT_VRFY_B:
 373                         dtls1_start_timer(s);
 374                         ret=dtls1_send_client_verify(s);
 375                         if (ret <= 0) goto end;
 376                         s->state=SSL3_ST_CW_CHANGE_A;
 377                         s->init_num=0;
 378                         s->s3->change_cipher_spec=0;
 379                         break;
 380
 381                 case SSL3_ST_CW_CHANGE_A:
 382                 case SSL3_ST_CW_CHANGE_B:
 383                         dtls1_start_timer(s);
 384                         ret=dtls1_send_change_cipher_spec(s,
 385                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 386                         if (ret <= 0) goto end;
 387                         s->state=SSL3_ST_CW_FINISHED_A;
 388                         s->init_num=0;
 389
 390                         s->session->cipher=s->s3->tmp.new_cipher;
 391 #ifdef OPENSSL_NO_COMP
 392                         s->session->compress_meth=0;
 393 #else
 394                         if (s->s3->tmp.new_compression == NULL)
 395                                 s->session->compress_meth=0;
 396                         else
 397                                 s->session->compress_meth=
 398                                         s->s3->tmp.new_compression->id;
 399 #endif
 400                         if (!s->method->ssl3_enc->setup_key_block(s))
 401                                 {
 402                                 ret= -1;
 403                                 goto end;
 404                                 }
 405
 406                         if (!s->method->ssl3_enc->change_cipher_state(s,
 407                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 408                                 {
 409                                 ret= -1;
 410                                 goto end;
 411                                 }
 412
 413                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 414                         break;
 415
 416                 case SSL3_ST_CW_FINISHED_A:
 417                 case SSL3_ST_CW_FINISHED_B:
 418                         dtls1_start_timer(s);
 419                         ret=dtls1_send_finished(s,
 420                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 421                                 s->method->ssl3_enc->client_finished_label,
 422                                 s->method->ssl3_enc->client_finished_label_len);
 423                         if (ret <= 0) goto end;
 424                         s->state=SSL3_ST_CW_FLUSH;
 425
 426                         /* clear flags */
 427                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 428                         if (s->hit)
 429                                 {
 430                                 s->s3->tmp.next_state=SSL_ST_OK;
 431                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 432                                         {
 433                                         s->state=SSL_ST_OK;
 434                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 435                                         s->s3->delay_buf_pop_ret=0;
 436                                         }
 437                                 }
 438                         else
 439                                 {
 440                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 441                                 }
 442                         s->init_num=0;
 443                         break;
 444
 445                 case SSL3_ST_CR_FINISHED_A:
 446                 case SSL3_ST_CR_FINISHED_B:
 447                         s->d1->change_cipher_spec_ok = 1;
 448                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 449                                 SSL3_ST_CR_FINISHED_B);
 450                         if (ret <= 0) goto end;
 451                         dtls1_stop_timer(s);
 452
 453                         if (s->hit)
 454                                 s->state=SSL3_ST_CW_CHANGE_A;
 455                         else
 456                                 s->state=SSL_ST_OK;
 457                         s->init_num=0;
 458                         break;
 459
 460                 case SSL3_ST_CW_FLUSH:
 461                         /* number of bytes to be flushed */
 462                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 463                         if (num1 > 0)
 464                                 {
 465                                 s->rwstate=SSL_WRITING;
 466                                 num1=BIO_flush(s->wbio);
 467                                 if (num1 <= 0) { ret= -1; goto end; }
 468                                 s->rwstate=SSL_NOTHING;
 469                                 }
 470
 471                         s->state=s->s3->tmp.next_state;
 472                         break;
 473
 474                 case SSL_ST_OK:
 475                         /* clean a few things up */
 476                         ssl3_cleanup_key_block(s);
 477
 478 #if 0
 479                         if (s->init_buf != NULL)
 480                                 {
 481                                 BUF_MEM_free(s->init_buf);
 482                                 s->init_buf=NULL;
 483                                 }
 484 #endif
 485
 486                         /* If we are not 'joining' the last two packets,
 487                          * remove the buffering now */
 488                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 489                                 ssl_free_wbio_buffer(s);
 490                         /* else do it later in ssl3_write */
 491
 492                         s->init_num=0;
 493                         s->new_session=0;
 494
 495                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 496                         if (s->hit) s->ctx->stats.sess_hit++;
 497
 498                         ret=1;
 499                         /* s->server=0; */
 500                         s->handshake_func=dtls1_connect;
 501                         s->ctx->stats.sess_connect_good++;
 502
 503                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 504
 505                         /* done with handshaking */
 506                         s->d1->handshake_read_seq  = 0;
 507                         s->d1->next_handshake_write_seq = 0;
 508                         goto end;
 509                         /* break; */
 510
 511                 default:
 512                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 513                         ret= -1;
 514                         goto end;
 515                         /* break; */
 516                         }
 517
 518                 /* did we do anything */
 519                 if (!s->s3->tmp.reuse_message && !skip)
 520                         {
 521                         if (s->debug)
 522                                 {
 523                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 524                                         goto end;
 525                                 }
 526
 527                         if ((cb != NULL) && (s->state != state))
 528                                 {
 529                                 new_state=s->state;
 530                                 s->state=state;
 531                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 532                                 s->state=new_state;
 533                                 }
 534                         }
 535                 skip=0;
 536                 }
 537 end:
 538         s->in_handshake--;
 539         if (buf != NULL)
 540                 BUF_MEM_free(buf);
 541         if (cb != NULL)
 542                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 543         return(ret);
 544         }
 545
 546 int dtls1_client_hello(SSL *s)
 547         {
 548         unsigned char *buf;
 549         unsigned char *p,*d;
 550         unsigned int i,j;
 551         unsigned long Time,l;
 552         SSL_COMP *comp;
 553
 554         buf=(unsigned char *)s->init_buf->data;
 555         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 556                 {
 557                 if ((s->session == NULL) ||
 558                         (s->session->ssl_version != s->version) ||
 559                         (s->session->not_resumable))
 560                         {
 561                         if (!ssl_get_new_session(s,0))
 562                                 goto err;
 563                         }
 564                 /* else use the pre-loaded session */
 565
 566                 p=s->s3->client_random;
 567
 568                 /* if client_random is initialized, reuse it, we are
 569                  * required to use same upon reply to HelloVerify */
 570                 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
 571                 if (i==sizeof(s->s3->client_random))
 572                         {
 573                         Time=(unsigned long)time(NULL); /* Time */
 574                         l2n(Time,p);
 575                         RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4);
 576                         }
 577
 578                 /* Do the message type and length last */
 579                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 580
 581                 *(p++)=s->version>>8;
 582                 *(p++)=s->version&0xff;
 583                 s->client_version=s->version;
 584
 585                 /* Random stuff */
 586                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 587                 p+=SSL3_RANDOM_SIZE;
 588
 589                 /* Session ID */
 590                 if (s->new_session)
 591                         i=0;
 592                 else
 593                         i=s->session->session_id_length;
 594                 *(p++)=i;
 595                 if (i != 0)
 596                         {
 597                         if (i > sizeof s->session->session_id)
 598                                 {
 599                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 600                                 goto err;
 601                                 }
 602                         memcpy(p,s->session->session_id,i);
 603                         p+=i;
 604                         }
 605
 606                 /* cookie stuff */
 607                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 608                         {
 609                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 610                         goto err;
 611                         }
 612                 *(p++) = s->d1->cookie_len;
 613                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 614                 p += s->d1->cookie_len;
 615
 616                 /* Ciphers supported */
 617                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 618                 if (i == 0)
 619                         {
 620                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 621                         goto err;
 622                         }
 623                 s2n(i,p);
 624                 p+=i;
 625
 626                 /* COMPRESSION */
 627                 if (s->ctx->comp_methods == NULL)
 628                         j=0;
 629                 else
 630                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 631                 *(p++)=1+j;
 632                 for (i=0; i<j; i++)
 633                         {
 634                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 635                         *(p++)=comp->id;
 636                         }
 637                 *(p++)=0; /* Add the NULL method */
 638
 639 #ifndef OPENSSL_NO_TLSEXT
 640                 if ((p = ssl_add_clienthello_dtlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 641                         {
 642                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 643                         goto err;
 644                         }
 645 #endif
 646
 647                 l=(p-d);
 648                 d=buf;
 649
 650                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 651
 652                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 653                 /* number of bytes to write */
 654                 s->init_num=p-buf;
 655                 s->init_off=0;
 656
 657                 /* buffer the message to handle re-xmits */
 658                 dtls1_buffer_message(s, 0);
 659                 }
 660
 661         /* SSL3_ST_CW_CLNT_HELLO_B */
 662         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 663 err:
 664         return(-1);
 665         }
 666
 667 static int dtls1_get_hello_verify(SSL *s)
 668         {
 669         int n, al, ok = 0;
 670         unsigned char *data;
 671         unsigned int cookie_len;
 672
 673         n=s->method->ssl_get_message(s,
 674                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 675                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 676                 -1,
 677                 s->max_cert_list,
 678                 &ok);
 679
 680         if (!ok) return((int)n);
 681
 682         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 683                 {
 684                 s->d1->send_cookie = 0;
 685                 s->s3->tmp.reuse_message=1;
 686                 return(1);
 687                 }
 688
 689         data = (unsigned char *)s->init_msg;
 690
 691         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 692                 {
 693                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 694                 s->version=(s->version&0xff00)|data[1];
 695                 al = SSL_AD_PROTOCOL_VERSION;
 696                 goto f_err;
 697                 }
 698         data+=2;
 699
 700         cookie_len = *(data++);
 701         if ( cookie_len > sizeof(s->d1->cookie))
 702                 {
 703                 al=SSL_AD_ILLEGAL_PARAMETER;
 704                 goto f_err;
 705                 }
 706
 707         memcpy(s->d1->cookie, data, cookie_len);
 708         s->d1->cookie_len = cookie_len;
 709
 710         s->d1->send_cookie = 1;
 711         return 1;
 712
 713 f_err:
 714         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 715         return -1;
 716         }
 717
 718 int dtls1_send_client_key_exchange(SSL *s)
 719         {
 720         unsigned char *p,*d;
 721         int n;
 722         unsigned long alg_k;
 723 #ifndef OPENSSL_NO_RSA
 724         unsigned char *q;
 725         EVP_PKEY *pkey=NULL;
 726 #endif
 727 #ifndef OPENSSL_NO_KRB5
 728         KSSL_ERR kssl_err;
 729 #endif /* OPENSSL_NO_KRB5 */
 730 #ifndef OPENSSL_NO_ECDH
 731         EC_KEY *clnt_ecdh = NULL;
 732         const EC_POINT *srvr_ecpoint = NULL;
 733         EVP_PKEY *srvr_pub_pkey = NULL;
 734         unsigned char *encodedPoint = NULL;
 735         int encoded_pt_len = 0;
 736         BN_CTX * bn_ctx = NULL;
 737 #endif
 738
 739         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
 740                 {
 741                 d=(unsigned char *)s->init_buf->data;
 742                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 743
 744                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
 745
 746                 /* Fool emacs indentation */
 747                 if (0) {}
 748 #ifndef OPENSSL_NO_RSA
 749                 else if (alg_k & SSL_kRSA)
 750                         {
 751                         RSA *rsa;
 752                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 753
 754                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
 755                                 rsa=s->session->sess_cert->peer_rsa_tmp;
 756                         else
 757                                 {
 758                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 759                                 if ((pkey == NULL) ||
 760                                         (pkey->type != EVP_PKEY_RSA) ||
 761                                         (pkey->pkey.rsa == NULL))
 762                                         {
 763                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 764                                         goto err;
 765                                         }
 766                                 rsa=pkey->pkey.rsa;
 767                                 EVP_PKEY_free(pkey);
 768                                 }
 769
 770                         tmp_buf[0]=s->client_version>>8;
 771                         tmp_buf[1]=s->client_version&0xff;
 772                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
 773                                         goto err;
 774
 775                         s->session->master_key_length=sizeof tmp_buf;
 776
 777                         q=p;
 778                         /* Fix buf for TLS and [incidentally] DTLS */
 779                         if (s->version > SSL3_VERSION)
 780                                 p+=2;
 781                         n=RSA_public_encrypt(sizeof tmp_buf,
 782                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
 783 #ifdef PKCS1_CHECK
 784                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
 785                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
 786 #endif
 787                         if (n <= 0)
 788                                 {
 789                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
 790                                 goto err;
 791                                 }
 792
 793                         /* Fix buf for TLS and [incidentally] DTLS */
 794                         if (s->version > SSL3_VERSION)
 795                                 {
 796                                 s2n(n,q);
 797                                 n+=2;
 798                                 }
 799
 800                         s->session->master_key_length=
 801                                 s->method->ssl3_enc->generate_master_secret(s,
 802                                         s->session->master_key,
 803                                         tmp_buf,sizeof tmp_buf);
 804                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
 805                         }
 806 #endif
 807 #ifndef OPENSSL_NO_KRB5
 808                 else if (alg_k & SSL_kKRB5)
 809                         {
 810                         krb5_error_code krb5rc;
 811                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
 812                         /*  krb5_data   krb5_ap_req;  */
 813                         krb5_data       *enc_ticket;
 814                         krb5_data       authenticator, *authp = NULL;
 815                         EVP_CIPHER_CTX  ciph_ctx;
 816                         const EVP_CIPHER *enc = NULL;
 817                         unsigned char   iv[EVP_MAX_IV_LENGTH];
 818                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 819                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
 820                                                 + EVP_MAX_IV_LENGTH];
 821                         int             padl, outl = sizeof(epms);
 822
 823                         EVP_CIPHER_CTX_init(&ciph_ctx);
 824
 825 #ifdef KSSL_DEBUG
 826                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
 827                                 alg_k, SSL_kKRB5);
 828 #endif  /* KSSL_DEBUG */
 829
 830                         authp = NULL;
 831 #ifdef KRB5SENDAUTH
 832                         if (KRB5SENDAUTH)  authp = &authenticator;
 833 #endif  /* KRB5SENDAUTH */
 834
 835                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
 836                                 &kssl_err);
 837                         enc = kssl_map_enc(kssl_ctx->enctype);
 838                         if (enc == NULL)
 839                             goto err;
 840 #ifdef KSSL_DEBUG
 841                         {
 842                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
 843                         if (krb5rc && kssl_err.text)
 844                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
 845                         }
 846 #endif  /* KSSL_DEBUG */
 847
 848                         if (krb5rc)
 849                                 {
 850                                 ssl3_send_alert(s,SSL3_AL_FATAL,
 851                                                 SSL_AD_HANDSHAKE_FAILURE);
 852                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 853                                                 kssl_err.reason);
 854                                 goto err;
 855                                 }
 856
 857                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
 858                         **  in place of RFC 2712 KerberosWrapper, as in:
 859                         **
 860                         **  Send ticket (copy to *p, set n = length)
 861                         **  n = krb5_ap_req.length;
 862                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
 863                         **  if (krb5_ap_req.data)
 864                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
 865                         **
 866                         **  Now using real RFC 2712 KerberosWrapper
 867                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
 868                         **  Note: 2712 "opaque" types are here replaced
 869                         **  with a 2-byte length followed by the value.
 870                         **  Example:
 871                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
 872                         **  Where "xx xx" = length bytes.  Shown here with
 873                         **  optional authenticator omitted.
 874                         */
 875
 876                         /*  KerberosWrapper.Ticket              */
 877                         s2n(enc_ticket->length,p);
 878                         memcpy(p, enc_ticket->data, enc_ticket->length);
 879                         p+= enc_ticket->length;
 880                         n = enc_ticket->length + 2;
 881
 882                         /*  KerberosWrapper.Authenticator       */
 883                         if (authp  &&  authp->length)
 884                                 {
 885                                 s2n(authp->length,p);
 886                                 memcpy(p, authp->data, authp->length);
 887                                 p+= authp->length;
 888                                 n+= authp->length + 2;
 889
 890                                 free(authp->data);
 891                                 authp->data = NULL;
 892                                 authp->length = 0;
 893                                 }
 894                         else
 895                                 {
 896                                 s2n(0,p);/*  null authenticator length  */
 897                                 n+=2;
 898                                 }
 899
 900                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
 901                             goto err;
 902
 903                         /*  20010420 VRS.  Tried it this way; failed.
 904                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
 905                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
 906                         **                              kssl_ctx->length);
 907                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
 908                         */
 909
 910                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
 911                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
 912                                 kssl_ctx->key,iv);
 913                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
 914                                 sizeof tmp_buf);
 915                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
 916                         outl += padl;
 917                         if (outl > (int)sizeof epms)
 918                                 {
 919                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 920                                 goto err;
 921                                 }
 922                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
 923
 924                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
 925                         s2n(outl,p);
 926                         memcpy(p, epms, outl);
 927                         p+=outl;
 928                         n+=outl + 2;
 929
 930                         s->session->master_key_length=
 931                                 s->method->ssl3_enc->generate_master_secret(s,
 932                                         s->session->master_key,
 933                                         tmp_buf, sizeof tmp_buf);
 934
 935                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
 936                         OPENSSL_cleanse(epms, outl);
 937                         }
 938 #endif
 939 #ifndef OPENSSL_NO_DH
 940                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 941                         {
 942                         DH *dh_srvr,*dh_clnt;
 943
 944                         if (s->session->sess_cert->peer_dh_tmp != NULL)
 945                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
 946                         else
 947                                 {
 948                                 /* we get them from the cert */
 949                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 950                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
 951                                 goto err;
 952                                 }
 953
 954                         /* generate a new random key */
 955                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
 956                                 {
 957                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 958                                 goto err;
 959                                 }
 960                         if (!DH_generate_key(dh_clnt))
 961                                 {
 962                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 963                                 goto err;
 964                                 }
 965
 966                         /* use the 'p' output buffer for the DH key, but
 967                          * make sure to clear it out afterwards */
 968
 969                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
 970
 971                         if (n <= 0)
 972                                 {
 973                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 974                                 goto err;
 975                                 }
 976
 977                         /* generate master key from the result */
 978                         s->session->master_key_length=
 979                                 s->method->ssl3_enc->generate_master_secret(s,
 980                                         s->session->master_key,p,n);
 981                         /* clean up */
 982                         memset(p,0,n);
 983
 984                         /* send off the data */
 985                         n=BN_num_bytes(dh_clnt->pub_key);
 986                         s2n(n,p);
 987                         BN_bn2bin(dh_clnt->pub_key,p);
 988                         n+=2;
 989
 990                         DH_free(dh_clnt);
 991
 992                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
 993                         }
 994 #endif
 995 #ifndef OPENSSL_NO_ECDH
 996                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
 997                         {
 998                         const EC_GROUP *srvr_group = NULL;
 999                         EC_KEY *tkey;
1000                         int ecdh_clnt_cert = 0;
1001                         int field_size = 0;
1002
1003                         /* Did we send out the client's
1004                          * ECDH share for use in premaster
1005                          * computation as part of client certificate?
1006                          * If so, set ecdh_clnt_cert to 1.
1007                          */
1008                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
1009                                 {
1010                                 /* XXX: For now, we do not support client
1011                                  * authentication using ECDH certificates.
1012                                  * To add such support, one needs to add
1013                                  * code that checks for appropriate
1014                                  * conditions and sets ecdh_clnt_cert to 1.
1015                                  * For example, the cert have an ECC
1016                                  * key on the same curve as the server's
1017                                  * and the key should be authorized for
1018                                  * key agreement.
1019                                  *
1020                                  * One also needs to add code in ssl3_connect
1021                                  * to skip sending the certificate verify
1022                                  * message.
1023                                  *
1024                                  * if ((s->cert->key->privatekey != NULL) &&
1025                                  *     (s->cert->key->privatekey->type ==
1026                                  *      EVP_PKEY_EC) && ...)
1027                                  * ecdh_clnt_cert = 1;
1028                                  */
1029                                 }
1030
1031                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1032                                 {
1033                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
1034                                 }
1035                         else
1036                                 {
1037                                 /* Get the Server Public Key from Cert */
1038                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1039                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1040                                 if ((srvr_pub_pkey == NULL) ||
1041                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1042                                     (srvr_pub_pkey->pkey.ec == NULL))
1043                                         {
1044                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1045                                             ERR_R_INTERNAL_ERROR);
1046                                         goto err;
1047                                         }
1048
1049                                 tkey = srvr_pub_pkey->pkey.ec;
1050                                 }
1051
1052                         srvr_group   = EC_KEY_get0_group(tkey);
1053                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1054
1055                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1056                                 {
1057                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1058                                     ERR_R_INTERNAL_ERROR);
1059                                 goto err;
1060                                 }
1061
1062                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
1063                                 {
1064                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1065                                 goto err;
1066                                 }
1067
1068                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
1069                                 {
1070                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1071                                 goto err;
1072                                 }
1073                         if (ecdh_clnt_cert)
1074                                 {
1075                                 /* Reuse key info from our certificate
1076                                  * We only need our private key to perform
1077                                  * the ECDH computation.
1078                                  */
1079                                 const BIGNUM *priv_key;
1080                                 tkey = s->cert->key->privatekey->pkey.ec;
1081                                 priv_key = EC_KEY_get0_private_key(tkey);
1082                                 if (priv_key == NULL)
1083                                         {
1084                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1085                                         goto err;
1086                                         }
1087                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
1088                                         {
1089                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1090                                         goto err;
1091                                         }
1092                                 }
1093                         else
1094                                 {
1095                                 /* Generate a new ECDH key pair */
1096                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
1097                                         {
1098                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1099                                         goto err;
1100                                         }
1101                                 }
1102
1103                         /* use the 'p' output buffer for the ECDH key, but
1104                          * make sure to clear it out afterwards
1105                          */
1106
1107                         field_size = EC_GROUP_get_degree(srvr_group);
1108                         if (field_size <= 0)
1109                                 {
1110                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1111                                        ERR_R_ECDH_LIB);
1112                                 goto err;
1113                                 }
1114                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1115                         if (n <= 0)
1116                                 {
1117                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1118                                        ERR_R_ECDH_LIB);
1119                                 goto err;
1120                                 }
1121
1122                         /* generate master key from the result */
1123                         s->session->master_key_length = s->method->ssl3_enc \
1124                             -> generate_master_secret(s,
1125                                 s->session->master_key,
1126                                 p, n);
1127
1128                         memset(p, 0, n); /* clean up */
1129
1130                         if (ecdh_clnt_cert)
1131                                 {
1132                                 /* Send empty client key exch message */
1133                                 n = 0;
1134                                 }
1135                         else
1136                                 {
1137                                 /* First check the size of encoding and
1138                                  * allocate memory accordingly.
1139                                  */
1140                                 encoded_pt_len =
1141                                     EC_POINT_point2oct(srvr_group,
1142                                         EC_KEY_get0_public_key(clnt_ecdh),
1143                                         POINT_CONVERSION_UNCOMPRESSED,
1144                                         NULL, 0, NULL);
1145
1146                                 encodedPoint = (unsigned char *)
1147                                     OPENSSL_malloc(encoded_pt_len *
1148                                         sizeof(unsigned char));
1149                                 bn_ctx = BN_CTX_new();
1150                                 if ((encodedPoint == NULL) ||
1151                                     (bn_ctx == NULL))
1152                                         {
1153                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1154                                         goto err;
1155                                         }
1156
1157                                 /* Encode the public key */
1158                                 n = EC_POINT_point2oct(srvr_group,
1159                                     EC_KEY_get0_public_key(clnt_ecdh),
1160                                     POINT_CONVERSION_UNCOMPRESSED,
1161                                     encodedPoint, encoded_pt_len, bn_ctx);
1162
1163                                 *p = n; /* length of encoded point */
1164                                 /* Encoded point will be copied here */
1165                                 p += 1;
1166                                 /* copy the point */
1167                                 memcpy((unsigned char *)p, encodedPoint, n);
1168                                 /* increment n to account for length field */
1169                                 n += 1;
1170                                 }
1171
1172                         /* Free allocated memory */
1173                         BN_CTX_free(bn_ctx);
1174                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1175                         if (clnt_ecdh != NULL)
1176                                  EC_KEY_free(clnt_ecdh);
1177                         EVP_PKEY_free(srvr_pub_pkey);
1178                         }
1179 #endif /* !OPENSSL_NO_ECDH */
1180
1181 #ifndef OPENSSL_NO_PSK
1182                 else if (alg_k & SSL_kPSK)
1183                         {
1184                         char identity[PSK_MAX_IDENTITY_LEN];
1185                         unsigned char *t = NULL;
1186                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
1187                         unsigned int pre_ms_len = 0, psk_len = 0;
1188                         int psk_err = 1;
1189
1190                         n = 0;
1191                         if (s->psk_client_callback == NULL)
1192                                 {
1193                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1194                                         SSL_R_PSK_NO_CLIENT_CB);
1195                                 goto err;
1196                                 }
1197
1198                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
1199                                 identity, PSK_MAX_IDENTITY_LEN,
1200                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
1201                         if (psk_len > PSK_MAX_PSK_LEN)
1202                                 {
1203                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1204                                         ERR_R_INTERNAL_ERROR);
1205                                 goto psk_err;
1206                                 }
1207                         else if (psk_len == 0)
1208                                 {
1209                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1210                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
1211                                 goto psk_err;
1212                                 }
1213
1214                         /* create PSK pre_master_secret */
1215                         pre_ms_len = 2+psk_len+2+psk_len;
1216                         t = psk_or_pre_ms;
1217                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
1218                         s2n(psk_len, t);
1219                         memset(t, 0, psk_len);
1220                         t+=psk_len;
1221                         s2n(psk_len, t);
1222
1223                         if (s->session->psk_identity_hint != NULL)
1224                                 OPENSSL_free(s->session->psk_identity_hint);
1225                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
1226                         if (s->ctx->psk_identity_hint != NULL &&
1227                                 s->session->psk_identity_hint == NULL)
1228                                 {
1229                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1230                                         ERR_R_MALLOC_FAILURE);
1231                                 goto psk_err;
1232                                 }
1233
1234                         if (s->session->psk_identity != NULL)
1235                                 OPENSSL_free(s->session->psk_identity);
1236                         s->session->psk_identity = BUF_strdup(identity);
1237                         if (s->session->psk_identity == NULL)
1238                                 {
1239                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1240                                         ERR_R_MALLOC_FAILURE);
1241                                 goto psk_err;
1242                                 }
1243
1244                         s->session->master_key_length =
1245                                 s->method->ssl3_enc->generate_master_secret(s,
1246                                         s->session->master_key,
1247                                         psk_or_pre_ms, pre_ms_len);
1248                         n = strlen(identity);
1249                         s2n(n, p);
1250                         memcpy(p, identity, n);
1251                         n+=2;
1252                         psk_err = 0;
1253                 psk_err:
1254                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
1255                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
1256                         if (psk_err != 0)
1257                                 {
1258                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1259                                 goto err;
1260                                 }
1261                         }
1262 #endif
1263                 else
1264                         {
1265                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1266                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1267                         goto err;
1268                         }
1269
1270                 d = dtls1_set_message_header(s, d,
1271                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1272                 /*
1273                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1274                  l2n3(n,d);
1275                  l2n(s->d1->handshake_write_seq,d);
1276                  s->d1->handshake_write_seq++;
1277                 */
1278
1279                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1280                 /* number of bytes to write */
1281                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1282                 s->init_off=0;
1283
1284                 /* buffer the message to handle re-xmits */
1285                 dtls1_buffer_message(s, 0);
1286                 }
1287
1288         /* SSL3_ST_CW_KEY_EXCH_B */
1289         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1290 err:
1291 #ifndef OPENSSL_NO_ECDH
1292         BN_CTX_free(bn_ctx);
1293         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1294         if (clnt_ecdh != NULL)
1295                 EC_KEY_free(clnt_ecdh);
1296         EVP_PKEY_free(srvr_pub_pkey);
1297 #endif
1298         return(-1);
1299         }
1300
1301 int dtls1_send_client_verify(SSL *s)
1302         {
1303         unsigned char *p,*d;
1304         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1305         EVP_PKEY *pkey;
1306 #ifndef OPENSSL_NO_RSA
1307         unsigned u=0;
1308 #endif
1309         unsigned long n;
1310 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
1311         int j;
1312 #endif
1313
1314         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1315                 {
1316                 d=(unsigned char *)s->init_buf->data;
1317                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1318                 pkey=s->cert->key->privatekey;
1319
1320                 s->method->ssl3_enc->cert_verify_mac(s,
1321                 NID_sha1,
1322                         &(data[MD5_DIGEST_LENGTH]));
1323
1324 #ifndef OPENSSL_NO_RSA
1325                 if (pkey->type == EVP_PKEY_RSA)
1326                         {
1327                         s->method->ssl3_enc->cert_verify_mac(s,
1328                                 NID_md5,
1329                                 &(data[0]));
1330                         if (RSA_sign(NID_md5_sha1, data,
1331                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1332                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1333                                 {
1334                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1335                                 goto err;
1336                                 }
1337                         s2n(u,p);
1338                         n=u+2;
1339                         }
1340                 else
1341 #endif
1342 #ifndef OPENSSL_NO_DSA
1343                         if (pkey->type == EVP_PKEY_DSA)
1344                         {
1345                         if (!DSA_sign(pkey->save_type,
1346                                 &(data[MD5_DIGEST_LENGTH]),
1347                                 SHA_DIGEST_LENGTH,&(p[2]),
1348                                 (unsigned int *)&j,pkey->pkey.dsa))
1349                                 {
1350                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1351                                 goto err;
1352                                 }
1353                         s2n(j,p);
1354                         n=j+2;
1355                         }
1356                 else
1357 #endif
1358 #ifndef OPENSSL_NO_ECDSA
1359                         if (pkey->type == EVP_PKEY_EC)
1360                         {
1361                         if (!ECDSA_sign(pkey->save_type,
1362                                 &(data[MD5_DIGEST_LENGTH]),
1363                                 SHA_DIGEST_LENGTH,&(p[2]),
1364                                 (unsigned int *)&j,pkey->pkey.ec))
1365                                 {
1366                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,
1367                                     ERR_R_ECDSA_LIB);
1368                                 goto err;
1369                                 }
1370                         s2n(j,p);
1371                         n=j+2;
1372                         }
1373                 else
1374 #endif
1375                         {
1376                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1377                         goto err;
1378                         }
1379
1380                 d = dtls1_set_message_header(s, d,
1381                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1382
1383                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1384                 s->init_off=0;
1385
1386                 /* buffer the message to handle re-xmits */
1387                 dtls1_buffer_message(s, 0);
1388
1389                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1390                 }
1391
1392         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1393         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1394 err:
1395         return(-1);
1396         }
1397
1398 int dtls1_send_client_certificate(SSL *s)
1399         {
1400         X509 *x509=NULL;
1401         EVP_PKEY *pkey=NULL;
1402         int i;
1403         unsigned long l;
1404
1405         if (s->state == SSL3_ST_CW_CERT_A)
1406                 {
1407                 if ((s->cert == NULL) ||
1408                         (s->cert->key->x509 == NULL) ||
1409                         (s->cert->key->privatekey == NULL))
1410                         s->state=SSL3_ST_CW_CERT_B;
1411                 else
1412                         s->state=SSL3_ST_CW_CERT_C;
1413                 }
1414
1415         /* We need to get a client cert */
1416         if (s->state == SSL3_ST_CW_CERT_B)
1417                 {
1418                 /* If we get an error, we need to
1419                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1420                  * We then get retied later */
1421                 i=0;
1422                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1423                 if (i < 0)
1424                         {
1425                         s->rwstate=SSL_X509_LOOKUP;
1426                         return(-1);
1427                         }
1428                 s->rwstate=SSL_NOTHING;
1429                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1430                         {
1431                         s->state=SSL3_ST_CW_CERT_B;
1432                         if (    !SSL_use_certificate(s,x509) ||
1433                                 !SSL_use_PrivateKey(s,pkey))
1434                                 i=0;
1435                         }
1436                 else if (i == 1)
1437                         {
1438                         i=0;
1439                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1440                         }
1441
1442                 if (x509 != NULL) X509_free(x509);
1443                 if (pkey != NULL) EVP_PKEY_free(pkey);
1444                 if (i == 0)
1445                         {
1446                         if (s->version == SSL3_VERSION)
1447                                 {
1448                                 s->s3->tmp.cert_req=0;
1449                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1450                                 return(1);
1451                                 }
1452                         else
1453                                 {
1454                                 s->s3->tmp.cert_req=2;
1455                                 }
1456                         }
1457
1458                 /* Ok, we have a cert */
1459                 s->state=SSL3_ST_CW_CERT_C;
1460                 }
1461
1462         if (s->state == SSL3_ST_CW_CERT_C)
1463                 {
1464                 s->state=SSL3_ST_CW_CERT_D;
1465                 l=dtls1_output_cert_chain(s,
1466                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1467                 s->init_num=(int)l;
1468                 s->init_off=0;
1469
1470                 /* set header called by dtls1_output_cert_chain() */
1471
1472                 /* buffer the message to handle re-xmits */
1473                 dtls1_buffer_message(s, 0);
1474                 }
1475         /* SSL3_ST_CW_CERT_D */
1476         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1477         }
1478
1479