ssl/d1_clnt.c

   1 /* ssl/d1_clnt.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2005 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #include <openssl/buffer.h>
 119 #include <openssl/rand.h>
 120 #include <openssl/objects.h>
 121 #include <openssl/evp.h>
 122 #include <openssl/md5.h>
 123 #include <openssl/bn.h>
 124 #ifndef OPENSSL_NO_DH
 125 #include <openssl/dh.h>
 126 #endif
 127
 128 static SSL_METHOD *dtls1_get_client_method(int ver);
 129 static int dtls1_get_hello_verify(SSL *s);
 130
 131 static SSL_METHOD *dtls1_get_client_method(int ver)
 132         {
 133         if (ver == DTLS1_VERSION)
 134                 return(DTLSv1_client_method());
 135         else
 136                 return(NULL);
 137         }
 138
 139 SSL_METHOD *DTLSv1_client_method(void)
 140         {
 141         static int init=1;
 142         static SSL_METHOD DTLSv1_client_data;
 143
 144         if (init)
 145                 {
 146                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
 147
 148                 if (init)
 149                         {
 150                         memcpy((char *)&DTLSv1_client_data,(char *)dtlsv1_base_method(),
 151                                 sizeof(SSL_METHOD));
 152                         DTLSv1_client_data.ssl_connect=dtls1_connect;
 153                         DTLSv1_client_data.get_ssl_method=dtls1_get_client_method;
 154                         init=0;
 155                         }
 156
 157                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
 158                 }
 159         return(&DTLSv1_client_data);
 160         }
 161
 162 int dtls1_connect(SSL *s)
 163         {
 164         BUF_MEM *buf=NULL;
 165         unsigned long Time=time(NULL),l;
 166         long num1;
 167         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 168         int ret= -1;
 169         int new_state,state,skip=0;;
 170
 171         RAND_add(&Time,sizeof(Time),0);
 172         ERR_clear_error();
 173         clear_sys_error();
 174
 175         if (s->info_callback != NULL)
 176                 cb=s->info_callback;
 177         else if (s->ctx->info_callback != NULL)
 178                 cb=s->ctx->info_callback;
 179
 180         s->in_handshake++;
 181         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 182
 183         for (;;)
 184                 {
 185                 state=s->state;
 186
 187                 switch(s->state)
 188                         {
 189                 case SSL_ST_RENEGOTIATE:
 190                         s->new_session=1;
 191                         s->state=SSL_ST_CONNECT;
 192                         s->ctx->stats.sess_connect_renegotiate++;
 193                         /* break */
 194                 case SSL_ST_BEFORE:
 195                 case SSL_ST_CONNECT:
 196                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 197                 case SSL_ST_OK|SSL_ST_CONNECT:
 198
 199                         s->server=0;
 200                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 201
 202                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00))
 203                                 {
 204                                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 205                                 ret = -1;
 206                                 goto end;
 207                                 }
 208
 209                         /* s->version=SSL3_VERSION; */
 210                         s->type=SSL_ST_CONNECT;
 211
 212                         if (s->init_buf == NULL)
 213                                 {
 214                                 if ((buf=BUF_MEM_new()) == NULL)
 215                                         {
 216                                         ret= -1;
 217                                         goto end;
 218                                         }
 219                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 220                                         {
 221                                         ret= -1;
 222                                         goto end;
 223                                         }
 224                                 s->init_buf=buf;
 225                                 buf=NULL;
 226                                 }
 227
 228                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 229
 230                         /* setup buffing BIO */
 231                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 232
 233                         /* don't push the buffering BIO quite yet */
 234
 235                         ssl3_init_finished_mac(s);
 236
 237                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 238                         s->ctx->stats.sess_connect++;
 239                         s->init_num=0;
 240                         break;
 241
 242                 case SSL3_ST_CW_CLNT_HELLO_A:
 243                 case SSL3_ST_CW_CLNT_HELLO_B:
 244
 245                         s->shutdown=0;
 246                         ret=dtls1_client_hello(s);
 247                         if (ret <= 0) goto end;
 248
 249                         if ( s->d1->send_cookie)
 250                                 {
 251                                 s->state=SSL3_ST_CW_FLUSH;
 252                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 253                                 }
 254                         else
 255                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 256
 257                         s->init_num=0;
 258
 259                         /* turn on buffering for the next lot of output */
 260                         if (s->bbio != s->wbio)
 261                                 s->wbio=BIO_push(s->bbio,s->wbio);
 262
 263                         break;
 264
 265                 case SSL3_ST_CR_SRVR_HELLO_A:
 266                 case SSL3_ST_CR_SRVR_HELLO_B:
 267                         ret=ssl3_get_server_hello(s);
 268                         if (ret <= 0) goto end;
 269                         else
 270                                 {
 271                                 if (s->hit)
 272                                         s->state=SSL3_ST_CR_FINISHED_A;
 273                                 else
 274                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 275                                 }
 276                         s->init_num=0;
 277                         break;
 278
 279                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 280                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 281
 282                         ret = dtls1_get_hello_verify(s);
 283                         if ( ret <= 0)
 284                                 goto end;
 285                         if ( s->d1->send_cookie) /* start again, with a cookie */
 286                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 287                         else
 288                                 s->state = SSL3_ST_CR_CERT_A;
 289                         s->init_num = 0;
 290                         break;
 291
 292                 case SSL3_ST_CR_CERT_A:
 293                 case SSL3_ST_CR_CERT_B:
 294                         /* Check if it is anon DH */
 295                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 296                                 {
 297                                 ret=ssl3_get_server_certificate(s);
 298                                 if (ret <= 0) goto end;
 299                                 }
 300                         else
 301                                 skip=1;
 302                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 303                         s->init_num=0;
 304                         break;
 305
 306                 case SSL3_ST_CR_KEY_EXCH_A:
 307                 case SSL3_ST_CR_KEY_EXCH_B:
 308                         ret=ssl3_get_key_exchange(s);
 309                         if (ret <= 0) goto end;
 310                         s->state=SSL3_ST_CR_CERT_REQ_A;
 311                         s->init_num=0;
 312
 313                         /* at this point we check that we have the
 314                          * required stuff from the server */
 315                         if (!ssl3_check_cert_and_algorithm(s))
 316                                 {
 317                                 ret= -1;
 318                                 goto end;
 319                                 }
 320                         break;
 321
 322                 case SSL3_ST_CR_CERT_REQ_A:
 323                 case SSL3_ST_CR_CERT_REQ_B:
 324                         ret=ssl3_get_certificate_request(s);
 325                         if (ret <= 0) goto end;
 326                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 327                         s->init_num=0;
 328                         break;
 329
 330                 case SSL3_ST_CR_SRVR_DONE_A:
 331                 case SSL3_ST_CR_SRVR_DONE_B:
 332                         ret=ssl3_get_server_done(s);
 333                         if (ret <= 0) goto end;
 334                         if (s->s3->tmp.cert_req)
 335                                 s->state=SSL3_ST_CW_CERT_A;
 336                         else
 337                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 338                         s->init_num=0;
 339
 340                         break;
 341
 342                 case SSL3_ST_CW_CERT_A:
 343                 case SSL3_ST_CW_CERT_B:
 344                 case SSL3_ST_CW_CERT_C:
 345                 case SSL3_ST_CW_CERT_D:
 346                         ret=dtls1_send_client_certificate(s);
 347                         if (ret <= 0) goto end;
 348                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 349                         s->init_num=0;
 350                         break;
 351
 352                 case SSL3_ST_CW_KEY_EXCH_A:
 353                 case SSL3_ST_CW_KEY_EXCH_B:
 354                         ret=dtls1_send_client_key_exchange(s);
 355                         if (ret <= 0) goto end;
 356                         l=s->s3->tmp.new_cipher->algorithms;
 357                         /* EAY EAY EAY need to check for DH fix cert
 358                          * sent back */
 359                         /* For TLS, cert_req is set to 2, so a cert chain
 360                          * of nothing is sent, but no verify packet is sent */
 361                         if (s->s3->tmp.cert_req == 1)
 362                                 {
 363                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 364                                 }
 365                         else
 366                                 {
 367                                 s->state=SSL3_ST_CW_CHANGE_A;
 368                                 s->s3->change_cipher_spec=0;
 369                                 }
 370
 371                         s->init_num=0;
 372                         break;
 373
 374                 case SSL3_ST_CW_CERT_VRFY_A:
 375                 case SSL3_ST_CW_CERT_VRFY_B:
 376                         ret=dtls1_send_client_verify(s);
 377                         if (ret <= 0) goto end;
 378                         s->state=SSL3_ST_CW_CHANGE_A;
 379                         s->init_num=0;
 380                         s->s3->change_cipher_spec=0;
 381                         break;
 382
 383                 case SSL3_ST_CW_CHANGE_A:
 384                 case SSL3_ST_CW_CHANGE_B:
 385                         ret=dtls1_send_change_cipher_spec(s,
 386                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 387                         if (ret <= 0) goto end;
 388                         s->state=SSL3_ST_CW_FINISHED_A;
 389                         s->init_num=0;
 390
 391                         s->session->cipher=s->s3->tmp.new_cipher;
 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                         if (!s->method->ssl3_enc->setup_key_block(s))
 398                                 {
 399                                 ret= -1;
 400                                 goto end;
 401                                 }
 402
 403                         if (!s->method->ssl3_enc->change_cipher_state(s,
 404                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 405                                 {
 406                                 ret= -1;
 407                                 goto end;
 408                                 }
 409
 410                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 411                         break;
 412
 413                 case SSL3_ST_CW_FINISHED_A:
 414                 case SSL3_ST_CW_FINISHED_B:
 415                         ret=dtls1_send_finished(s,
 416                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 417                                 s->method->ssl3_enc->client_finished_label,
 418                                 s->method->ssl3_enc->client_finished_label_len);
 419                         if (ret <= 0) goto end;
 420                         s->state=SSL3_ST_CW_FLUSH;
 421
 422                         /* clear flags */
 423                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 424                         if (s->hit)
 425                                 {
 426                                 s->s3->tmp.next_state=SSL_ST_OK;
 427                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 428                                         {
 429                                         s->state=SSL_ST_OK;
 430                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 431                                         s->s3->delay_buf_pop_ret=0;
 432                                         }
 433                                 }
 434                         else
 435                                 {
 436                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 437                                 }
 438                         s->init_num=0;
 439                         break;
 440
 441                 case SSL3_ST_CR_FINISHED_A:
 442                 case SSL3_ST_CR_FINISHED_B:
 443
 444                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 445                                 SSL3_ST_CR_FINISHED_B);
 446                         if (ret <= 0) goto end;
 447
 448                         if (s->hit)
 449                                 s->state=SSL3_ST_CW_CHANGE_A;
 450                         else
 451                                 s->state=SSL_ST_OK;
 452                         s->init_num=0;
 453                         break;
 454
 455                 case SSL3_ST_CW_FLUSH:
 456                         /* number of bytes to be flushed */
 457                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 458                         if (num1 > 0)
 459                                 {
 460                                 s->rwstate=SSL_WRITING;
 461                                 num1=BIO_flush(s->wbio);
 462                                 if (num1 <= 0) { ret= -1; goto end; }
 463                                 s->rwstate=SSL_NOTHING;
 464                                 }
 465
 466                         s->state=s->s3->tmp.next_state;
 467                         break;
 468
 469                 case SSL_ST_OK:
 470                         /* clean a few things up */
 471                         ssl3_cleanup_key_block(s);
 472
 473 #if 0
 474                         if (s->init_buf != NULL)
 475                                 {
 476                                 BUF_MEM_free(s->init_buf);
 477                                 s->init_buf=NULL;
 478                                 }
 479 #endif
 480
 481                         /* If we are not 'joining' the last two packets,
 482                          * remove the buffering now */
 483                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 484                                 ssl_free_wbio_buffer(s);
 485                         /* else do it later in ssl3_write */
 486
 487                         s->init_num=0;
 488                         s->new_session=0;
 489
 490                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 491                         if (s->hit) s->ctx->stats.sess_hit++;
 492
 493                         ret=1;
 494                         /* s->server=0; */
 495                         s->handshake_func=dtls1_connect;
 496                         s->ctx->stats.sess_connect_good++;
 497
 498                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 499
 500                         /* done with handshaking */
 501                         s->d1->handshake_read_seq  = 0;
 502                         goto end;
 503                         /* break; */
 504
 505                 default:
 506                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 507                         ret= -1;
 508                         goto end;
 509                         /* break; */
 510                         }
 511
 512                 /* did we do anything */
 513                 if (!s->s3->tmp.reuse_message && !skip)
 514                         {
 515                         if (s->debug)
 516                                 {
 517                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 518                                         goto end;
 519                                 }
 520
 521                         if ((cb != NULL) && (s->state != state))
 522                                 {
 523                                 new_state=s->state;
 524                                 s->state=state;
 525                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 526                                 s->state=new_state;
 527                                 }
 528                         }
 529                 skip=0;
 530                 }
 531 end:
 532         s->in_handshake--;
 533         if (buf != NULL)
 534                 BUF_MEM_free(buf);
 535         if (cb != NULL)
 536                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 537         return(ret);
 538         }
 539
 540 int dtls1_client_hello(SSL *s)
 541         {
 542         unsigned char *buf;
 543         unsigned char *p,*d;
 544         unsigned int i,j;
 545         unsigned long Time,l;
 546         SSL_COMP *comp;
 547
 548         buf=(unsigned char *)s->init_buf->data;
 549         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 550                 {
 551                 if ((s->session == NULL) ||
 552                         (s->session->ssl_version != s->version) ||
 553                         (s->session->not_resumable))
 554                         {
 555                         if (!ssl_get_new_session(s,0))
 556                                 goto err;
 557                         }
 558                 /* else use the pre-loaded session */
 559
 560                 p=s->s3->client_random;
 561                 Time=time(NULL);                        /* Time */
 562                 l2n(Time,p);
 563                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 564
 565                 /* Do the message type and length last */
 566                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 567
 568                 *(p++)=s->version>>8;
 569                 *(p++)=s->version&0xff;
 570                 s->client_version=s->version;
 571
 572                 /* Random stuff */
 573                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 574                 p+=SSL3_RANDOM_SIZE;
 575
 576                 /* Session ID */
 577                 if (s->new_session)
 578                         i=0;
 579                 else
 580                         i=s->session->session_id_length;
 581                 *(p++)=i;
 582                 if (i != 0)
 583                         {
 584                         if (i > sizeof s->session->session_id)
 585                                 {
 586                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 587                                 goto err;
 588                                 }
 589                         memcpy(p,s->session->session_id,i);
 590                         p+=i;
 591                         }
 592
 593                 /* cookie stuff */
 594                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 595                         {
 596                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 597                         goto err;
 598                         }
 599                 *(p++) = s->d1->cookie_len;
 600                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 601                 p += s->d1->cookie_len;
 602
 603                 /* Ciphers supported */
 604                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 605                 if (i == 0)
 606                         {
 607                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 608                         goto err;
 609                         }
 610                 s2n(i,p);
 611                 p+=i;
 612
 613                 /* COMPRESSION */
 614                 if (s->ctx->comp_methods == NULL)
 615                         j=0;
 616                 else
 617                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 618                 *(p++)=1+j;
 619                 for (i=0; i<j; i++)
 620                         {
 621                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 622                         *(p++)=comp->id;
 623                         }
 624                 *(p++)=0; /* Add the NULL method */
 625
 626                 l=(p-d);
 627                 d=buf;
 628
 629                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 630
 631                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 632                 /* number of bytes to write */
 633                 s->init_num=p-buf;
 634                 s->init_off=0;
 635
 636                 /* buffer the message to handle re-xmits */
 637                 dtls1_buffer_message(s, 0);
 638                 }
 639
 640         /* SSL3_ST_CW_CLNT_HELLO_B */
 641         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 642 err:
 643         return(-1);
 644         }
 645
 646 static int dtls1_get_hello_verify(SSL *s)
 647         {
 648         int n, al, ok = 0;
 649         unsigned char *data;
 650         unsigned int cookie_len;
 651
 652         n=s->method->ssl_get_message(s,
 653                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 654                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 655                 -1,
 656                 s->max_cert_list,
 657                 &ok);
 658
 659         if (!ok) return((int)n);
 660
 661         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 662                 {
 663                 s->d1->send_cookie = 0;
 664                 s->s3->tmp.reuse_message=1;
 665                 return(1);
 666                 }
 667
 668         data = (unsigned char *)s->init_msg;
 669
 670         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 671                 {
 672                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 673                 s->version=(s->version&0xff00)|data[1];
 674                 al = SSL_AD_PROTOCOL_VERSION;
 675                 goto f_err;
 676                 }
 677         data+=2;
 678
 679         cookie_len = *(data++);
 680         if ( cookie_len > sizeof(s->d1->cookie))
 681                 {
 682                 al=SSL_AD_ILLEGAL_PARAMETER;
 683                 goto f_err;
 684                 }
 685
 686         memcpy(s->d1->cookie, data, cookie_len);
 687         s->d1->cookie_len = cookie_len;
 688
 689         s->d1->send_cookie = 1;
 690         return 1;
 691
 692 f_err:
 693         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 694         return -1;
 695         }
 696
 697 int dtls1_send_client_key_exchange(SSL *s)
 698         {
 699         unsigned char *p,*d;
 700         int n;
 701         unsigned long l;
 702 #ifndef OPENSSL_NO_RSA
 703         unsigned char *q;
 704         EVP_PKEY *pkey=NULL;
 705 #endif
 706 #ifndef OPENSSL_NO_KRB5
 707         KSSL_ERR kssl_err;
 708 #endif /* OPENSSL_NO_KRB5 */
 709
 710         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
 711                 {
 712                 d=(unsigned char *)s->init_buf->data;
 713                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 714
 715                 l=s->s3->tmp.new_cipher->algorithms;
 716
 717                 /* Fool emacs indentation */
 718                 if (0) {}
 719 #ifndef OPENSSL_NO_RSA
 720                 else if (l & SSL_kRSA)
 721                         {
 722                         RSA *rsa;
 723                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 724
 725                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
 726                                 rsa=s->session->sess_cert->peer_rsa_tmp;
 727                         else
 728                                 {
 729                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 730                                 if ((pkey == NULL) ||
 731                                         (pkey->type != EVP_PKEY_RSA) ||
 732                                         (pkey->pkey.rsa == NULL))
 733                                         {
 734                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 735                                         goto err;
 736                                         }
 737                                 rsa=pkey->pkey.rsa;
 738                                 EVP_PKEY_free(pkey);
 739                                 }
 740
 741                         tmp_buf[0]=s->client_version>>8;
 742                         tmp_buf[1]=s->client_version&0xff;
 743                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
 744                                         goto err;
 745
 746                         s->session->master_key_length=sizeof tmp_buf;
 747
 748                         q=p;
 749                         /* Fix buf for TLS and beyond */
 750                         if (s->version > SSL3_VERSION)
 751                                 p+=2;
 752                         n=RSA_public_encrypt(sizeof tmp_buf,
 753                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
 754 #ifdef PKCS1_CHECK
 755                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
 756                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
 757 #endif
 758                         if (n <= 0)
 759                                 {
 760                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
 761                                 goto err;
 762                                 }
 763
 764                         /* Fix buf for TLS and beyond */
 765                         if (s->version > SSL3_VERSION)
 766                                 {
 767                                 s2n(n,q);
 768                                 n+=2;
 769                                 }
 770
 771                         s->session->master_key_length=
 772                                 s->method->ssl3_enc->generate_master_secret(s,
 773                                         s->session->master_key,
 774                                         tmp_buf,sizeof tmp_buf);
 775                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
 776                         }
 777 #endif
 778 #ifndef OPENSSL_NO_KRB5
 779                 else if (l & SSL_kKRB5)
 780                         {
 781                         krb5_error_code krb5rc;
 782                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
 783                         /*  krb5_data   krb5_ap_req;  */
 784                         krb5_data       *enc_ticket;
 785                         krb5_data       authenticator, *authp = NULL;
 786                         EVP_CIPHER_CTX  ciph_ctx;
 787                         EVP_CIPHER      *enc = NULL;
 788                         unsigned char   iv[EVP_MAX_IV_LENGTH];
 789                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 790                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
 791                                                 + EVP_MAX_IV_LENGTH];
 792                         int             padl, outl = sizeof(epms);
 793
 794                         EVP_CIPHER_CTX_init(&ciph_ctx);
 795
 796 #ifdef KSSL_DEBUG
 797                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
 798                                 l, SSL_kKRB5);
 799 #endif  /* KSSL_DEBUG */
 800
 801                         authp = NULL;
 802 #ifdef KRB5SENDAUTH
 803                         if (KRB5SENDAUTH)  authp = &authenticator;
 804 #endif  /* KRB5SENDAUTH */
 805
 806                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
 807                                 &kssl_err);
 808                         enc = kssl_map_enc(kssl_ctx->enctype);
 809                         if (enc == NULL)
 810                             goto err;
 811 #ifdef KSSL_DEBUG
 812                         {
 813                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
 814                         if (krb5rc && kssl_err.text)
 815                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
 816                         }
 817 #endif  /* KSSL_DEBUG */
 818
 819                         if (krb5rc)
 820                                 {
 821                                 ssl3_send_alert(s,SSL3_AL_FATAL,
 822                                                 SSL_AD_HANDSHAKE_FAILURE);
 823                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 824                                                 kssl_err.reason);
 825                                 goto err;
 826                                 }
 827
 828                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
 829                         **  in place of RFC 2712 KerberosWrapper, as in:
 830                         **
 831                         **  Send ticket (copy to *p, set n = length)
 832                         **  n = krb5_ap_req.length;
 833                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
 834                         **  if (krb5_ap_req.data)
 835                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
 836                         **
 837                         **  Now using real RFC 2712 KerberosWrapper
 838                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
 839                         **  Note: 2712 "opaque" types are here replaced
 840                         **  with a 2-byte length followed by the value.
 841                         **  Example:
 842                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
 843                         **  Where "xx xx" = length bytes.  Shown here with
 844                         **  optional authenticator omitted.
 845                         */
 846
 847                         /*  KerberosWrapper.Ticket              */
 848                         s2n(enc_ticket->length,p);
 849                         memcpy(p, enc_ticket->data, enc_ticket->length);
 850                         p+= enc_ticket->length;
 851                         n = enc_ticket->length + 2;
 852
 853                         /*  KerberosWrapper.Authenticator       */
 854                         if (authp  &&  authp->length)
 855                                 {
 856                                 s2n(authp->length,p);
 857                                 memcpy(p, authp->data, authp->length);
 858                                 p+= authp->length;
 859                                 n+= authp->length + 2;
 860
 861                                 free(authp->data);
 862                                 authp->data = NULL;
 863                                 authp->length = 0;
 864                                 }
 865                         else
 866                                 {
 867                                 s2n(0,p);/*  null authenticator length  */
 868                                 n+=2;
 869                                 }
 870
 871                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
 872                             goto err;
 873
 874                         /*  20010420 VRS.  Tried it this way; failed.
 875                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
 876                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
 877                         **                              kssl_ctx->length);
 878                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
 879                         */
 880
 881                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
 882                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
 883                                 kssl_ctx->key,iv);
 884                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
 885                                 sizeof tmp_buf);
 886                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
 887                         outl += padl;
 888                         if (outl > sizeof epms)
 889                                 {
 890                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 891                                 goto err;
 892                                 }
 893                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
 894
 895                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
 896                         s2n(outl,p);
 897                         memcpy(p, epms, outl);
 898                         p+=outl;
 899                         n+=outl + 2;
 900
 901                         s->session->master_key_length=
 902                                 s->method->ssl3_enc->generate_master_secret(s,
 903                                         s->session->master_key,
 904                                         tmp_buf, sizeof tmp_buf);
 905
 906                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
 907                         OPENSSL_cleanse(epms, outl);
 908                         }
 909 #endif
 910 #ifndef OPENSSL_NO_DH
 911                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 912                         {
 913                         DH *dh_srvr,*dh_clnt;
 914
 915                         if (s->session->sess_cert->peer_dh_tmp != NULL)
 916                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
 917                         else
 918                                 {
 919                                 /* we get them from the cert */
 920                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 921                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
 922                                 goto err;
 923                                 }
 924
 925                         /* generate a new random key */
 926                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
 927                                 {
 928                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 929                                 goto err;
 930                                 }
 931                         if (!DH_generate_key(dh_clnt))
 932                                 {
 933                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 934                                 goto err;
 935                                 }
 936
 937                         /* use the 'p' output buffer for the DH key, but
 938                          * make sure to clear it out afterwards */
 939
 940                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
 941
 942                         if (n <= 0)
 943                                 {
 944                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 945                                 goto err;
 946                                 }
 947
 948                         /* generate master key from the result */
 949                         s->session->master_key_length=
 950                                 s->method->ssl3_enc->generate_master_secret(s,
 951                                         s->session->master_key,p,n);
 952                         /* clean up */
 953                         memset(p,0,n);
 954
 955                         /* send off the data */
 956                         n=BN_num_bytes(dh_clnt->pub_key);
 957                         s2n(n,p);
 958                         BN_bn2bin(dh_clnt->pub_key,p);
 959                         n+=2;
 960
 961                         DH_free(dh_clnt);
 962
 963                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
 964                         }
 965 #endif
 966                 else
 967                         {
 968                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 969                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 970                         goto err;
 971                         }
 972
 973                 d = dtls1_set_message_header(s, d,
 974                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
 975                 /*
 976                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
 977                  l2n3(n,d);
 978                  l2n(s->d1->handshake_write_seq,d);
 979                  s->d1->handshake_write_seq++;
 980                 */
 981
 982                 s->state=SSL3_ST_CW_KEY_EXCH_B;
 983                 /* number of bytes to write */
 984                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
 985                 s->init_off=0;
 986
 987                 /* buffer the message to handle re-xmits */
 988                 dtls1_buffer_message(s, 0);
 989                 }
 990
 991         /* SSL3_ST_CW_KEY_EXCH_B */
 992         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 993 err:
 994         return(-1);
 995         }
 996
 997 int dtls1_send_client_verify(SSL *s)
 998         {
 999         unsigned char *p,*d;
1000         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1001         EVP_PKEY *pkey;
1002 #ifndef OPENSSL_NO_RSA
1003         unsigned u=0;
1004 #endif
1005         unsigned long n;
1006 #ifndef OPENSSL_NO_DSA
1007         int j;
1008 #endif
1009
1010         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1011                 {
1012                 d=(unsigned char *)s->init_buf->data;
1013                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1014                 pkey=s->cert->key->privatekey;
1015
1016                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1017                         &(data[MD5_DIGEST_LENGTH]));
1018
1019 #ifndef OPENSSL_NO_RSA
1020                 if (pkey->type == EVP_PKEY_RSA)
1021                         {
1022                         s->method->ssl3_enc->cert_verify_mac(s,
1023                                 &(s->s3->finish_dgst1),&(data[0]));
1024                         if (RSA_sign(NID_md5_sha1, data,
1025                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1026                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1027                                 {
1028                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1029                                 goto err;
1030                                 }
1031                         s2n(u,p);
1032                         n=u+2;
1033                         }
1034                 else
1035 #endif
1036 #ifndef OPENSSL_NO_DSA
1037                         if (pkey->type == EVP_PKEY_DSA)
1038                         {
1039                         if (!DSA_sign(pkey->save_type,
1040                                 &(data[MD5_DIGEST_LENGTH]),
1041                                 SHA_DIGEST_LENGTH,&(p[2]),
1042                                 (unsigned int *)&j,pkey->pkey.dsa))
1043                                 {
1044                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1045                                 goto err;
1046                                 }
1047                         s2n(j,p);
1048                         n=j+2;
1049                         }
1050                 else
1051 #endif
1052                         {
1053                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1054                         goto err;
1055                         }
1056
1057                 d = dtls1_set_message_header(s, d,
1058                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1059
1060                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1061                 s->init_off=0;
1062
1063                 /* buffer the message to handle re-xmits */
1064                 dtls1_buffer_message(s, 0);
1065
1066                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1067                 }
1068
1069         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1070         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1071 err:
1072         return(-1);
1073         }
1074
1075 int dtls1_send_client_certificate(SSL *s)
1076         {
1077         X509 *x509=NULL;
1078         EVP_PKEY *pkey=NULL;
1079         int i;
1080         unsigned long l;
1081
1082         if (s->state == SSL3_ST_CW_CERT_A)
1083                 {
1084                 if ((s->cert == NULL) ||
1085                         (s->cert->key->x509 == NULL) ||
1086                         (s->cert->key->privatekey == NULL))
1087                         s->state=SSL3_ST_CW_CERT_B;
1088                 else
1089                         s->state=SSL3_ST_CW_CERT_C;
1090                 }
1091
1092         /* We need to get a client cert */
1093         if (s->state == SSL3_ST_CW_CERT_B)
1094                 {
1095                 /* If we get an error, we need to
1096                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1097                  * We then get retied later */
1098                 i=0;
1099                 if (s->ctx->client_cert_cb != NULL)
1100                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1101                 if (i < 0)
1102                         {
1103                         s->rwstate=SSL_X509_LOOKUP;
1104                         return(-1);
1105                         }
1106                 s->rwstate=SSL_NOTHING;
1107                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1108                         {
1109                         s->state=SSL3_ST_CW_CERT_B;
1110                         if (    !SSL_use_certificate(s,x509) ||
1111                                 !SSL_use_PrivateKey(s,pkey))
1112                                 i=0;
1113                         }
1114                 else if (i == 1)
1115                         {
1116                         i=0;
1117                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1118                         }
1119
1120                 if (x509 != NULL) X509_free(x509);
1121                 if (pkey != NULL) EVP_PKEY_free(pkey);
1122                 if (i == 0)
1123                         {
1124                         if (s->version == SSL3_VERSION)
1125                                 {
1126                                 s->s3->tmp.cert_req=0;
1127                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1128                                 return(1);
1129                                 }
1130                         else
1131                                 {
1132                                 s->s3->tmp.cert_req=2;
1133                                 }
1134                         }
1135
1136                 /* Ok, we have a cert */
1137                 s->state=SSL3_ST_CW_CERT_C;
1138                 }
1139
1140         if (s->state == SSL3_ST_CW_CERT_C)
1141                 {
1142                 s->state=SSL3_ST_CW_CERT_D;
1143                 l=dtls1_output_cert_chain(s,
1144                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1145                 s->init_num=(int)l;
1146                 s->init_off=0;
1147
1148                 /* set header called by dtls1_output_cert_chain() */
1149
1150                 /* buffer the message to handle re-xmits */
1151                 dtls1_buffer_message(s, 0);
1152                 }
1153         /* SSL3_ST_CW_CERT_D */
1154         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1155         }
1156
1157