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
 124 static SSL_METHOD *dtls1_get_client_method(int ver);
 125 static int dtls1_get_hello_verify(SSL *s);
 126
 127 static SSL_METHOD *dtls1_get_client_method(int ver)
 128         {
 129         if (ver == DTLS1_VERSION)
 130                 return(DTLSv1_client_method());
 131         else
 132                 return(NULL);
 133         }
 134
 135 SSL_METHOD *DTLSv1_client_method(void)
 136         {
 137         static int init=1;
 138         static SSL_METHOD DTLSv1_client_data;
 139
 140         if (init)
 141                 {
 142                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
 143
 144                 if (init)
 145                         {
 146                         memcpy((char *)&DTLSv1_client_data,(char *)dtlsv1_base_method(),
 147                                 sizeof(SSL_METHOD));
 148                         DTLSv1_client_data.ssl_connect=dtls1_connect;
 149                         DTLSv1_client_data.get_ssl_method=dtls1_get_client_method;
 150                         init=0;
 151                         }
 152
 153                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
 154                 }
 155         return(&DTLSv1_client_data);
 156         }
 157
 158 int dtls1_connect(SSL *s)
 159         {
 160         BUF_MEM *buf=NULL;
 161         unsigned long Time=time(NULL),l;
 162         long num1;
 163         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 164         int ret= -1;
 165         int new_state,state,skip=0;;
 166
 167         RAND_add(&Time,sizeof(Time),0);
 168         ERR_clear_error();
 169         clear_sys_error();
 170
 171         if (s->info_callback != NULL)
 172                 cb=s->info_callback;
 173         else if (s->ctx->info_callback != NULL)
 174                 cb=s->ctx->info_callback;
 175
 176         s->in_handshake++;
 177         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 178
 179         for (;;)
 180                 {
 181                 state=s->state;
 182
 183                 switch(s->state)
 184                         {
 185                 case SSL_ST_RENEGOTIATE:
 186                         s->new_session=1;
 187                         s->state=SSL_ST_CONNECT;
 188                         s->ctx->stats.sess_connect_renegotiate++;
 189                         /* break */
 190                 case SSL_ST_BEFORE:
 191                 case SSL_ST_CONNECT:
 192                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 193                 case SSL_ST_OK|SSL_ST_CONNECT:
 194
 195                         s->server=0;
 196                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 197
 198                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00))
 199                                 {
 200                                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 201                                 ret = -1;
 202                                 goto end;
 203                                 }
 204
 205                         /* s->version=SSL3_VERSION; */
 206                         s->type=SSL_ST_CONNECT;
 207
 208                         if (s->init_buf == NULL)
 209                                 {
 210                                 if ((buf=BUF_MEM_new()) == NULL)
 211                                         {
 212                                         ret= -1;
 213                                         goto end;
 214                                         }
 215                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 216                                         {
 217                                         ret= -1;
 218                                         goto end;
 219                                         }
 220                                 s->init_buf=buf;
 221                                 buf=NULL;
 222                                 }
 223
 224                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 225
 226                         /* setup buffing BIO */
 227                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 228
 229                         /* don't push the buffering BIO quite yet */
 230
 231                         ssl3_init_finished_mac(s);
 232
 233                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 234                         s->ctx->stats.sess_connect++;
 235                         s->init_num=0;
 236                         break;
 237
 238                 case SSL3_ST_CW_CLNT_HELLO_A:
 239                 case SSL3_ST_CW_CLNT_HELLO_B:
 240
 241                         s->shutdown=0;
 242                         ret=dtls1_client_hello(s);
 243                         if (ret <= 0) goto end;
 244
 245                         if ( s->d1->send_cookie)
 246                                 {
 247                                 s->state=SSL3_ST_CW_FLUSH;
 248                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 249                                 }
 250                         else
 251                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 252
 253                         s->init_num=0;
 254
 255                         /* turn on buffering for the next lot of output */
 256                         if (s->bbio != s->wbio)
 257                                 s->wbio=BIO_push(s->bbio,s->wbio);
 258
 259                         break;
 260
 261                 case SSL3_ST_CR_SRVR_HELLO_A:
 262                 case SSL3_ST_CR_SRVR_HELLO_B:
 263                         ret=ssl3_get_server_hello(s);
 264                         if (ret <= 0) goto end;
 265                         else
 266                                 {
 267                                 if (s->hit)
 268                                         s->state=SSL3_ST_CR_FINISHED_A;
 269                                 else
 270                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 271                                 }
 272                         s->init_num=0;
 273                         break;
 274
 275                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 276                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 277
 278                         ret = dtls1_get_hello_verify(s);
 279                         if ( ret <= 0)
 280                                 goto end;
 281                         if ( s->d1->send_cookie) /* start again, with a cookie */
 282                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 283                         else
 284                                 s->state = SSL3_ST_CR_CERT_A;
 285                         s->init_num = 0;
 286                         break;
 287
 288                 case SSL3_ST_CR_CERT_A:
 289                 case SSL3_ST_CR_CERT_B:
 290                         /* Check if it is anon DH */
 291                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 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                         ret=dtls1_send_client_certificate(s);
 343                         if (ret <= 0) goto end;
 344                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 345                         s->init_num=0;
 346                         break;
 347
 348                 case SSL3_ST_CW_KEY_EXCH_A:
 349                 case SSL3_ST_CW_KEY_EXCH_B:
 350                         ret=dtls1_send_client_key_exchange(s);
 351                         if (ret <= 0) goto end;
 352                         l=s->s3->tmp.new_cipher->algorithms;
 353                         /* EAY EAY EAY need to check for DH fix cert
 354                          * sent back */
 355                         /* For TLS, cert_req is set to 2, so a cert chain
 356                          * of nothing is sent, but no verify packet is sent */
 357                         if (s->s3->tmp.cert_req == 1)
 358                                 {
 359                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 360                                 }
 361                         else
 362                                 {
 363                                 s->state=SSL3_ST_CW_CHANGE_A;
 364                                 s->s3->change_cipher_spec=0;
 365                                 }
 366
 367                         s->init_num=0;
 368                         break;
 369
 370                 case SSL3_ST_CW_CERT_VRFY_A:
 371                 case SSL3_ST_CW_CERT_VRFY_B:
 372                         ret=dtls1_send_client_verify(s);
 373                         if (ret <= 0) goto end;
 374                         s->state=SSL3_ST_CW_CHANGE_A;
 375                         s->init_num=0;
 376                         s->s3->change_cipher_spec=0;
 377                         break;
 378
 379                 case SSL3_ST_CW_CHANGE_A:
 380                 case SSL3_ST_CW_CHANGE_B:
 381                         ret=dtls1_send_change_cipher_spec(s,
 382                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 383                         if (ret <= 0) goto end;
 384                         s->state=SSL3_ST_CW_FINISHED_A;
 385                         s->init_num=0;
 386
 387                         s->session->cipher=s->s3->tmp.new_cipher;
 388                         if (s->s3->tmp.new_compression == NULL)
 389                                 s->session->compress_meth=0;
 390                         else
 391                                 s->session->compress_meth=
 392                                         s->s3->tmp.new_compression->id;
 393                         if (!s->method->ssl3_enc->setup_key_block(s))
 394                                 {
 395                                 ret= -1;
 396                                 goto end;
 397                                 }
 398
 399                         if (!s->method->ssl3_enc->change_cipher_state(s,
 400                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 401                                 {
 402                                 ret= -1;
 403                                 goto end;
 404                                 }
 405
 406                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 407                         break;
 408
 409                 case SSL3_ST_CW_FINISHED_A:
 410                 case SSL3_ST_CW_FINISHED_B:
 411                         ret=dtls1_send_finished(s,
 412                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 413                                 s->method->ssl3_enc->client_finished_label,
 414                                 s->method->ssl3_enc->client_finished_label_len);
 415                         if (ret <= 0) goto end;
 416                         s->state=SSL3_ST_CW_FLUSH;
 417
 418                         /* clear flags */
 419                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 420                         if (s->hit)
 421                                 {
 422                                 s->s3->tmp.next_state=SSL_ST_OK;
 423                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 424                                         {
 425                                         s->state=SSL_ST_OK;
 426                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 427                                         s->s3->delay_buf_pop_ret=0;
 428                                         }
 429                                 }
 430                         else
 431                                 {
 432                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 433                                 }
 434                         s->init_num=0;
 435                         break;
 436
 437                 case SSL3_ST_CR_FINISHED_A:
 438                 case SSL3_ST_CR_FINISHED_B:
 439
 440                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 441                                 SSL3_ST_CR_FINISHED_B);
 442                         if (ret <= 0) goto end;
 443
 444                         if (s->hit)
 445                                 s->state=SSL3_ST_CW_CHANGE_A;
 446                         else
 447                                 s->state=SSL_ST_OK;
 448                         s->init_num=0;
 449                         break;
 450
 451                 case SSL3_ST_CW_FLUSH:
 452                         /* number of bytes to be flushed */
 453                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 454                         if (num1 > 0)
 455                                 {
 456                                 s->rwstate=SSL_WRITING;
 457                                 num1=BIO_flush(s->wbio);
 458                                 if (num1 <= 0) { ret= -1; goto end; }
 459                                 s->rwstate=SSL_NOTHING;
 460                                 }
 461
 462                         s->state=s->s3->tmp.next_state;
 463                         break;
 464
 465                 case SSL_ST_OK:
 466                         /* clean a few things up */
 467                         ssl3_cleanup_key_block(s);
 468
 469 #if 0
 470                         if (s->init_buf != NULL)
 471                                 {
 472                                 BUF_MEM_free(s->init_buf);
 473                                 s->init_buf=NULL;
 474                                 }
 475 #endif
 476
 477                         /* If we are not 'joining' the last two packets,
 478                          * remove the buffering now */
 479                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 480                                 ssl_free_wbio_buffer(s);
 481                         /* else do it later in ssl3_write */
 482
 483                         s->init_num=0;
 484                         s->new_session=0;
 485
 486                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 487                         if (s->hit) s->ctx->stats.sess_hit++;
 488
 489                         ret=1;
 490                         /* s->server=0; */
 491                         s->handshake_func=dtls1_connect;
 492                         s->ctx->stats.sess_connect_good++;
 493
 494                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 495
 496                         /* done with handshaking */
 497                         s->d1->handshake_read_seq  = 0;
 498                         goto end;
 499                         /* break; */
 500
 501                 default:
 502                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 503                         ret= -1;
 504                         goto end;
 505                         /* break; */
 506                         }
 507
 508                 /* did we do anything */
 509                 if (!s->s3->tmp.reuse_message && !skip)
 510                         {
 511                         if (s->debug)
 512                                 {
 513                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 514                                         goto end;
 515                                 }
 516
 517                         if ((cb != NULL) && (s->state != state))
 518                                 {
 519                                 new_state=s->state;
 520                                 s->state=state;
 521                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 522                                 s->state=new_state;
 523                                 }
 524                         }
 525                 skip=0;
 526                 }
 527 end:
 528         s->in_handshake--;
 529         if (buf != NULL)
 530                 BUF_MEM_free(buf);
 531         if (cb != NULL)
 532                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 533         return(ret);
 534         }
 535
 536 int dtls1_client_hello(SSL *s)
 537         {
 538         unsigned char *buf;
 539         unsigned char *p,*d;
 540         int i,j;
 541         unsigned long Time,l;
 542         SSL_COMP *comp;
 543
 544         buf=(unsigned char *)s->init_buf->data;
 545         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 546                 {
 547                 if ((s->session == NULL) ||
 548                         (s->session->ssl_version != s->version) ||
 549                         (s->session->not_resumable))
 550                         {
 551                         if (!ssl_get_new_session(s,0))
 552                                 goto err;
 553                         }
 554                 /* else use the pre-loaded session */
 555
 556                 p=s->s3->client_random;
 557                 Time=time(NULL);                        /* Time */
 558                 l2n(Time,p);
 559                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 560
 561                 /* Do the message type and length last */
 562                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 563
 564                 *(p++)=s->version>>8;
 565                 *(p++)=s->version&0xff;
 566                 s->client_version=s->version;
 567
 568                 /* Random stuff */
 569                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 570                 p+=SSL3_RANDOM_SIZE;
 571
 572                 /* Session ID */
 573                 if (s->new_session)
 574                         i=0;
 575                 else
 576                         i=s->session->session_id_length;
 577                 *(p++)=i;
 578                 if (i != 0)
 579                         {
 580                         if (i > sizeof s->session->session_id)
 581                                 {
 582                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 583                                 goto err;
 584                                 }
 585                         memcpy(p,s->session->session_id,i);
 586                         p+=i;
 587                         }
 588
 589                 /* cookie stuff */
 590                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 591                         {
 592                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 593                         goto err;
 594                         }
 595                 *(p++) = s->d1->cookie_len;
 596                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 597                 p += s->d1->cookie_len;
 598
 599                 /* Ciphers supported */
 600                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 601                 if (i == 0)
 602                         {
 603                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 604                         goto err;
 605                         }
 606                 s2n(i,p);
 607                 p+=i;
 608
 609                 /* COMPRESSION */
 610                 if (s->ctx->comp_methods == NULL)
 611                         j=0;
 612                 else
 613                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 614                 *(p++)=1+j;
 615                 for (i=0; i<j; i++)
 616                         {
 617                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 618                         *(p++)=comp->id;
 619                         }
 620                 *(p++)=0; /* Add the NULL method */
 621
 622                 l=(p-d);
 623                 d=buf;
 624
 625                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 626
 627                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 628                 /* number of bytes to write */
 629                 s->init_num=p-buf;
 630                 s->init_off=0;
 631
 632                 /* buffer the message to handle re-xmits */
 633                 dtls1_buffer_message(s, 0);
 634                 }
 635
 636         /* SSL3_ST_CW_CLNT_HELLO_B */
 637         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 638 err:
 639         return(-1);
 640         }
 641
 642 static int dtls1_get_hello_verify(SSL *s)
 643         {
 644         int n, al, ok = 0;
 645         unsigned char *data;
 646         unsigned int cookie_len;
 647
 648         n=s->method->ssl_get_message(s,
 649                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 650                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 651                 -1,
 652                 s->max_cert_list,
 653                 &ok);
 654
 655         if (!ok) return((int)n);
 656
 657         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 658                 {
 659                 s->d1->send_cookie = 0;
 660                 s->s3->tmp.reuse_message=1;
 661                 return(1);
 662                 }
 663
 664         data = (unsigned char *)s->init_msg;
 665
 666         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 667                 {
 668                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 669                 s->version=(s->version&0xff00)|data[1];
 670                 al = SSL_AD_PROTOCOL_VERSION;
 671                 goto f_err;
 672                 }
 673         data+=2;
 674
 675         cookie_len = *(data++);
 676         if ( cookie_len > sizeof(s->d1->cookie))
 677                 {
 678                 al=SSL_AD_ILLEGAL_PARAMETER;
 679                 goto f_err;
 680                 }
 681
 682         memcpy(s->d1->cookie, data, cookie_len);
 683         s->d1->cookie_len = cookie_len;
 684
 685         s->d1->send_cookie = 1;
 686         return 1;
 687
 688 f_err:
 689         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 690         return -1;
 691         }
 692
 693 int dtls1_send_client_key_exchange(SSL *s)
 694         {
 695         unsigned char *p,*d;
 696         int n;
 697         unsigned long l;
 698 #ifndef OPENSSL_NO_RSA
 699         unsigned char *q;
 700         EVP_PKEY *pkey=NULL;
 701 #endif
 702 #ifndef OPENSSL_NO_KRB5
 703         KSSL_ERR kssl_err;
 704 #endif /* OPENSSL_NO_KRB5 */
 705
 706         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
 707                 {
 708                 d=(unsigned char *)s->init_buf->data;
 709                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 710
 711                 l=s->s3->tmp.new_cipher->algorithms;
 712
 713                 /* Fool emacs indentation */
 714                 if (0) {}
 715 #ifndef OPENSSL_NO_RSA
 716                 else if (l & SSL_kRSA)
 717                         {
 718                         RSA *rsa;
 719                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 720
 721                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
 722                                 rsa=s->session->sess_cert->peer_rsa_tmp;
 723                         else
 724                                 {
 725                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 726                                 if ((pkey == NULL) ||
 727                                         (pkey->type != EVP_PKEY_RSA) ||
 728                                         (pkey->pkey.rsa == NULL))
 729                                         {
 730                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 731                                         goto err;
 732                                         }
 733                                 rsa=pkey->pkey.rsa;
 734                                 EVP_PKEY_free(pkey);
 735                                 }
 736
 737                         tmp_buf[0]=s->client_version>>8;
 738                         tmp_buf[1]=s->client_version&0xff;
 739                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
 740                                         goto err;
 741
 742                         s->session->master_key_length=sizeof tmp_buf;
 743
 744                         q=p;
 745                         /* Fix buf for TLS and beyond */
 746                         if (s->version > SSL3_VERSION)
 747                                 p+=2;
 748                         n=RSA_public_encrypt(sizeof tmp_buf,
 749                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
 750 #ifdef PKCS1_CHECK
 751                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
 752                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
 753 #endif
 754                         if (n <= 0)
 755                                 {
 756                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
 757                                 goto err;
 758                                 }
 759
 760                         /* Fix buf for TLS and beyond */
 761                         if (s->version > SSL3_VERSION)
 762                                 {
 763                                 s2n(n,q);
 764                                 n+=2;
 765                                 }
 766
 767                         s->session->master_key_length=
 768                                 s->method->ssl3_enc->generate_master_secret(s,
 769                                         s->session->master_key,
 770                                         tmp_buf,sizeof tmp_buf);
 771                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
 772                         }
 773 #endif
 774 #ifndef OPENSSL_NO_KRB5
 775                 else if (l & SSL_kKRB5)
 776                         {
 777                         krb5_error_code krb5rc;
 778                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
 779                         /*  krb5_data   krb5_ap_req;  */
 780                         krb5_data       *enc_ticket;
 781                         krb5_data       authenticator, *authp = NULL;
 782                         EVP_CIPHER_CTX  ciph_ctx;
 783                         EVP_CIPHER      *enc = NULL;
 784                         unsigned char   iv[EVP_MAX_IV_LENGTH];
 785                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 786                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
 787                                                 + EVP_MAX_IV_LENGTH];
 788                         int             padl, outl = sizeof(epms);
 789
 790                         EVP_CIPHER_CTX_init(&ciph_ctx);
 791
 792 #ifdef KSSL_DEBUG
 793                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
 794                                 l, SSL_kKRB5);
 795 #endif  /* KSSL_DEBUG */
 796
 797                         authp = NULL;
 798 #ifdef KRB5SENDAUTH
 799                         if (KRB5SENDAUTH)  authp = &authenticator;
 800 #endif  /* KRB5SENDAUTH */
 801
 802                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
 803                                 &kssl_err);
 804                         enc = kssl_map_enc(kssl_ctx->enctype);
 805                         if (enc == NULL)
 806                             goto err;
 807 #ifdef KSSL_DEBUG
 808                         {
 809                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
 810                         if (krb5rc && kssl_err.text)
 811                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
 812                         }
 813 #endif  /* KSSL_DEBUG */
 814
 815                         if (krb5rc)
 816                                 {
 817                                 ssl3_send_alert(s,SSL3_AL_FATAL,
 818                                                 SSL_AD_HANDSHAKE_FAILURE);
 819                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 820                                                 kssl_err.reason);
 821                                 goto err;
 822                                 }
 823
 824                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
 825                         **  in place of RFC 2712 KerberosWrapper, as in:
 826                         **
 827                         **  Send ticket (copy to *p, set n = length)
 828                         **  n = krb5_ap_req.length;
 829                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
 830                         **  if (krb5_ap_req.data)
 831                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
 832                         **
 833                         **  Now using real RFC 2712 KerberosWrapper
 834                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
 835                         **  Note: 2712 "opaque" types are here replaced
 836                         **  with a 2-byte length followed by the value.
 837                         **  Example:
 838                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
 839                         **  Where "xx xx" = length bytes.  Shown here with
 840                         **  optional authenticator omitted.
 841                         */
 842
 843                         /*  KerberosWrapper.Ticket              */
 844                         s2n(enc_ticket->length,p);
 845                         memcpy(p, enc_ticket->data, enc_ticket->length);
 846                         p+= enc_ticket->length;
 847                         n = enc_ticket->length + 2;
 848
 849                         /*  KerberosWrapper.Authenticator       */
 850                         if (authp  &&  authp->length)
 851                                 {
 852                                 s2n(authp->length,p);
 853                                 memcpy(p, authp->data, authp->length);
 854                                 p+= authp->length;
 855                                 n+= authp->length + 2;
 856
 857                                 free(authp->data);
 858                                 authp->data = NULL;
 859                                 authp->length = 0;
 860                                 }
 861                         else
 862                                 {
 863                                 s2n(0,p);/*  null authenticator length  */
 864                                 n+=2;
 865                                 }
 866
 867                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
 868                             goto err;
 869
 870                         /*  20010420 VRS.  Tried it this way; failed.
 871                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
 872                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
 873                         **                              kssl_ctx->length);
 874                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
 875                         */
 876
 877                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
 878                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
 879                                 kssl_ctx->key,iv);
 880                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
 881                                 sizeof tmp_buf);
 882                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
 883                         outl += padl;
 884                         if (outl > sizeof epms)
 885                                 {
 886                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 887                                 goto err;
 888                                 }
 889                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
 890
 891                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
 892                         s2n(outl,p);
 893                         memcpy(p, epms, outl);
 894                         p+=outl;
 895                         n+=outl + 2;
 896
 897                         s->session->master_key_length=
 898                                 s->method->ssl3_enc->generate_master_secret(s,
 899                                         s->session->master_key,
 900                                         tmp_buf, sizeof tmp_buf);
 901
 902                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
 903                         OPENSSL_cleanse(epms, outl);
 904                         }
 905 #endif
 906 #ifndef OPENSSL_NO_DH
 907                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 908                         {
 909                         DH *dh_srvr,*dh_clnt;
 910
 911                         if (s->session->sess_cert->peer_dh_tmp != NULL)
 912                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
 913                         else
 914                                 {
 915                                 /* we get them from the cert */
 916                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 917                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
 918                                 goto err;
 919                                 }
 920
 921                         /* generate a new random key */
 922                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
 923                                 {
 924                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 925                                 goto err;
 926                                 }
 927                         if (!DH_generate_key(dh_clnt))
 928                                 {
 929                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 930                                 goto err;
 931                                 }
 932
 933                         /* use the 'p' output buffer for the DH key, but
 934                          * make sure to clear it out afterwards */
 935
 936                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
 937
 938                         if (n <= 0)
 939                                 {
 940                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 941                                 goto err;
 942                                 }
 943
 944                         /* generate master key from the result */
 945                         s->session->master_key_length=
 946                                 s->method->ssl3_enc->generate_master_secret(s,
 947                                         s->session->master_key,p,n);
 948                         /* clean up */
 949                         memset(p,0,n);
 950
 951                         /* send off the data */
 952                         n=BN_num_bytes(dh_clnt->pub_key);
 953                         s2n(n,p);
 954                         BN_bn2bin(dh_clnt->pub_key,p);
 955                         n+=2;
 956
 957                         DH_free(dh_clnt);
 958
 959                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
 960                         }
 961 #endif
 962                 else
 963                         {
 964                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 965                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 966                         goto err;
 967                         }
 968
 969                 d = dtls1_set_message_header(s, d,
 970                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
 971                 /*
 972                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
 973                  l2n3(n,d);
 974                  l2n(s->d1->handshake_write_seq,d);
 975                  s->d1->handshake_write_seq++;
 976                 */
 977
 978                 s->state=SSL3_ST_CW_KEY_EXCH_B;
 979                 /* number of bytes to write */
 980                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
 981                 s->init_off=0;
 982
 983                 /* buffer the message to handle re-xmits */
 984                 dtls1_buffer_message(s, 0);
 985                 }
 986
 987         /* SSL3_ST_CW_KEY_EXCH_B */
 988         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 989 err:
 990         return(-1);
 991         }
 992
 993 int dtls1_send_client_verify(SSL *s)
 994         {
 995         unsigned char *p,*d;
 996         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 997         EVP_PKEY *pkey;
 998 #ifndef OPENSSL_NO_RSA
 999         unsigned u=0;
1000 #endif
1001         unsigned long n;
1002 #ifndef OPENSSL_NO_DSA
1003         int j;
1004 #endif
1005
1006         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1007                 {
1008                 d=(unsigned char *)s->init_buf->data;
1009                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1010                 pkey=s->cert->key->privatekey;
1011
1012                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1013                         &(data[MD5_DIGEST_LENGTH]));
1014
1015 #ifndef OPENSSL_NO_RSA
1016                 if (pkey->type == EVP_PKEY_RSA)
1017                         {
1018                         s->method->ssl3_enc->cert_verify_mac(s,
1019                                 &(s->s3->finish_dgst1),&(data[0]));
1020                         if (RSA_sign(NID_md5_sha1, data,
1021                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1022                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1023                                 {
1024                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1025                                 goto err;
1026                                 }
1027                         s2n(u,p);
1028                         n=u+2;
1029                         }
1030                 else
1031 #endif
1032 #ifndef OPENSSL_NO_DSA
1033                         if (pkey->type == EVP_PKEY_DSA)
1034                         {
1035                         if (!DSA_sign(pkey->save_type,
1036                                 &(data[MD5_DIGEST_LENGTH]),
1037                                 SHA_DIGEST_LENGTH,&(p[2]),
1038                                 (unsigned int *)&j,pkey->pkey.dsa))
1039                                 {
1040                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1041                                 goto err;
1042                                 }
1043                         s2n(j,p);
1044                         n=j+2;
1045                         }
1046                 else
1047 #endif
1048                         {
1049                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1050                         goto err;
1051                         }
1052
1053                 d = dtls1_set_message_header(s, d,
1054                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1055
1056                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1057                 s->init_off=0;
1058
1059                 /* buffer the message to handle re-xmits */
1060                 dtls1_buffer_message(s, 0);
1061
1062                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1063                 }
1064
1065         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1066         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1067 err:
1068         return(-1);
1069         }
1070
1071 int dtls1_send_client_certificate(SSL *s)
1072         {
1073         X509 *x509=NULL;
1074         EVP_PKEY *pkey=NULL;
1075         int i;
1076         unsigned long l;
1077
1078         if (s->state == SSL3_ST_CW_CERT_A)
1079                 {
1080                 if ((s->cert == NULL) ||
1081                         (s->cert->key->x509 == NULL) ||
1082                         (s->cert->key->privatekey == NULL))
1083                         s->state=SSL3_ST_CW_CERT_B;
1084                 else
1085                         s->state=SSL3_ST_CW_CERT_C;
1086                 }
1087
1088         /* We need to get a client cert */
1089         if (s->state == SSL3_ST_CW_CERT_B)
1090                 {
1091                 /* If we get an error, we need to
1092                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1093                  * We then get retied later */
1094                 i=0;
1095                 if (s->ctx->client_cert_cb != NULL)
1096                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1097                 if (i < 0)
1098                         {
1099                         s->rwstate=SSL_X509_LOOKUP;
1100                         return(-1);
1101                         }
1102                 s->rwstate=SSL_NOTHING;
1103                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1104                         {
1105                         s->state=SSL3_ST_CW_CERT_B;
1106                         if (    !SSL_use_certificate(s,x509) ||
1107                                 !SSL_use_PrivateKey(s,pkey))
1108                                 i=0;
1109                         }
1110                 else if (i == 1)
1111                         {
1112                         i=0;
1113                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1114                         }
1115
1116                 if (x509 != NULL) X509_free(x509);
1117                 if (pkey != NULL) EVP_PKEY_free(pkey);
1118                 if (i == 0)
1119                         {
1120                         if (s->version == SSL3_VERSION)
1121                                 {
1122                                 s->s3->tmp.cert_req=0;
1123                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1124                                 return(1);
1125                                 }
1126                         else
1127                                 {
1128                                 s->s3->tmp.cert_req=2;
1129                                 }
1130                         }
1131
1132                 /* Ok, we have a cert */
1133                 s->state=SSL3_ST_CW_CERT_C;
1134                 }
1135
1136         if (s->state == SSL3_ST_CW_CERT_C)
1137                 {
1138                 s->state=SSL3_ST_CW_CERT_D;
1139                 l=dtls1_output_cert_chain(s,
1140                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1141                 s->init_num=(int)l;
1142                 s->init_off=0;
1143
1144                 /* set header called by dtls1_output_cert_chain() */
1145
1146                 /* buffer the message to handle re-xmits */
1147                 dtls1_buffer_message(s, 0);
1148                 }
1149         /* SSL3_ST_CW_CERT_D */
1150         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1151         }
1152
1153