ssl/d1_clnt.c

   1 /* ssl/d1_clnt.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2007 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #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 #ifndef OPENSSL_NO_DH
 124 #include <openssl/dh.h>
 125 #endif
 126
 127 static const SSL_METHOD *dtls1_get_client_method(int ver);
 128 static int dtls1_get_hello_verify(SSL *s);
 129
 130 static const SSL_METHOD *dtls1_get_client_method(int ver)
 131         {
 132         if (ver == DTLS1_VERSION)
 133                 return(DTLSv1_client_method());
 134         else
 135                 return(NULL);
 136         }
 137
 138 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
 139                         ssl_undefined_function,
 140                         dtls1_connect,
 141                         dtls1_get_client_method)
 142
 143 int dtls1_connect(SSL *s)
 144         {
 145         BUF_MEM *buf=NULL;
 146         unsigned long Time=(unsigned long)time(NULL);
 147         long num1;
 148         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 149         int ret= -1;
 150         int new_state,state,skip=0;;
 151
 152         RAND_add(&Time,sizeof(Time),0);
 153         ERR_clear_error();
 154         clear_sys_error();
 155
 156         if (s->info_callback != NULL)
 157                 cb=s->info_callback;
 158         else if (s->ctx->info_callback != NULL)
 159                 cb=s->ctx->info_callback;
 160
 161         s->in_handshake++;
 162         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 163
 164         for (;;)
 165                 {
 166                 state=s->state;
 167
 168                 switch(s->state)
 169                         {
 170                 case SSL_ST_RENEGOTIATE:
 171                         s->new_session=1;
 172                         s->state=SSL_ST_CONNECT;
 173                         s->ctx->stats.sess_connect_renegotiate++;
 174                         /* break */
 175                 case SSL_ST_BEFORE:
 176                 case SSL_ST_CONNECT:
 177                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 178                 case SSL_ST_OK|SSL_ST_CONNECT:
 179
 180                         s->server=0;
 181                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 182
 183                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00))
 184                                 {
 185                                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 186                                 ret = -1;
 187                                 goto end;
 188                                 }
 189
 190                         /* s->version=SSL3_VERSION; */
 191                         s->type=SSL_ST_CONNECT;
 192
 193                         if (s->init_buf == NULL)
 194                                 {
 195                                 if ((buf=BUF_MEM_new()) == NULL)
 196                                         {
 197                                         ret= -1;
 198                                         goto end;
 199                                         }
 200                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 201                                         {
 202                                         ret= -1;
 203                                         goto end;
 204                                         }
 205                                 s->init_buf=buf;
 206                                 buf=NULL;
 207                                 }
 208
 209                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 210
 211                         /* setup buffing BIO */
 212                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 213
 214                         /* don't push the buffering BIO quite yet */
 215
 216                         ssl3_init_finished_mac(s);
 217
 218                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 219                         s->ctx->stats.sess_connect++;
 220                         s->init_num=0;
 221                         /* mark client_random uninitialized */
 222                         memset(s->s3->client_random,0,sizeof(s->s3->client_random));
 223                         break;
 224
 225                 case SSL3_ST_CW_CLNT_HELLO_A:
 226                 case SSL3_ST_CW_CLNT_HELLO_B:
 227
 228                         s->shutdown=0;
 229                         ret=dtls1_client_hello(s);
 230                         if (ret <= 0) goto end;
 231
 232                         if ( s->d1->send_cookie)
 233                                 {
 234                                 s->state=SSL3_ST_CW_FLUSH;
 235                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 236                                 }
 237                         else
 238                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 239
 240                         s->init_num=0;
 241
 242                         /* turn on buffering for the next lot of output */
 243                         if (s->bbio != s->wbio)
 244                                 s->wbio=BIO_push(s->bbio,s->wbio);
 245
 246                         break;
 247
 248                 case SSL3_ST_CR_SRVR_HELLO_A:
 249                 case SSL3_ST_CR_SRVR_HELLO_B:
 250                         ret=ssl3_get_server_hello(s);
 251                         if (ret <= 0) goto end;
 252                         else
 253                                 {
 254                                 if (s->hit)
 255                                         s->state=SSL3_ST_CR_FINISHED_A;
 256                                 else
 257                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 258                                 }
 259                         s->init_num=0;
 260                         break;
 261
 262                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 263                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 264
 265                         ret = dtls1_get_hello_verify(s);
 266                         if ( ret <= 0)
 267                                 goto end;
 268                         if ( s->d1->send_cookie) /* start again, with a cookie */
 269                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 270                         else
 271                                 s->state = SSL3_ST_CR_CERT_A;
 272                         s->init_num = 0;
 273                         break;
 274
 275                 case SSL3_ST_CR_CERT_A:
 276                 case SSL3_ST_CR_CERT_B:
 277                         /* Check if it is anon DH */
 278                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
 279                                 {
 280                                 ret=ssl3_get_server_certificate(s);
 281                                 if (ret <= 0) goto end;
 282                                 }
 283                         else
 284                                 skip=1;
 285                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 286                         s->init_num=0;
 287                         break;
 288
 289                 case SSL3_ST_CR_KEY_EXCH_A:
 290                 case SSL3_ST_CR_KEY_EXCH_B:
 291                         ret=ssl3_get_key_exchange(s);
 292                         if (ret <= 0) goto end;
 293                         s->state=SSL3_ST_CR_CERT_REQ_A;
 294                         s->init_num=0;
 295
 296                         /* at this point we check that we have the
 297                          * required stuff from the server */
 298                         if (!ssl3_check_cert_and_algorithm(s))
 299                                 {
 300                                 ret= -1;
 301                                 goto end;
 302                                 }
 303                         break;
 304
 305                 case SSL3_ST_CR_CERT_REQ_A:
 306                 case SSL3_ST_CR_CERT_REQ_B:
 307                         ret=ssl3_get_certificate_request(s);
 308                         if (ret <= 0) goto end;
 309                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 310                         s->init_num=0;
 311                         break;
 312
 313                 case SSL3_ST_CR_SRVR_DONE_A:
 314                 case SSL3_ST_CR_SRVR_DONE_B:
 315                         ret=ssl3_get_server_done(s);
 316                         if (ret <= 0) goto end;
 317                         if (s->s3->tmp.cert_req)
 318                                 s->state=SSL3_ST_CW_CERT_A;
 319                         else
 320                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 321                         s->init_num=0;
 322
 323                         break;
 324
 325                 case SSL3_ST_CW_CERT_A:
 326                 case SSL3_ST_CW_CERT_B:
 327                 case SSL3_ST_CW_CERT_C:
 328                 case SSL3_ST_CW_CERT_D:
 329                         ret=dtls1_send_client_certificate(s);
 330                         if (ret <= 0) goto end;
 331                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 332                         s->init_num=0;
 333                         break;
 334
 335                 case SSL3_ST_CW_KEY_EXCH_A:
 336                 case SSL3_ST_CW_KEY_EXCH_B:
 337                         ret=dtls1_send_client_key_exchange(s);
 338                         if (ret <= 0) goto end;
 339                         /* EAY EAY EAY need to check for DH fix cert
 340                          * sent back */
 341                         /* For TLS, cert_req is set to 2, so a cert chain
 342                          * of nothing is sent, but no verify packet is sent */
 343                         if (s->s3->tmp.cert_req == 1)
 344                                 {
 345                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 346                                 }
 347                         else
 348                                 {
 349                                 s->state=SSL3_ST_CW_CHANGE_A;
 350                                 s->s3->change_cipher_spec=0;
 351                                 }
 352
 353                         s->init_num=0;
 354                         break;
 355
 356                 case SSL3_ST_CW_CERT_VRFY_A:
 357                 case SSL3_ST_CW_CERT_VRFY_B:
 358                         ret=dtls1_send_client_verify(s);
 359                         if (ret <= 0) goto end;
 360                         s->state=SSL3_ST_CW_CHANGE_A;
 361                         s->init_num=0;
 362                         s->s3->change_cipher_spec=0;
 363                         break;
 364
 365                 case SSL3_ST_CW_CHANGE_A:
 366                 case SSL3_ST_CW_CHANGE_B:
 367                         ret=dtls1_send_change_cipher_spec(s,
 368                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 369                         if (ret <= 0) goto end;
 370                         s->state=SSL3_ST_CW_FINISHED_A;
 371                         s->init_num=0;
 372
 373                         s->session->cipher=s->s3->tmp.new_cipher;
 374 #ifdef OPENSSL_NO_COMP
 375                         s->session->compress_meth=0;
 376 #else
 377                         if (s->s3->tmp.new_compression == NULL)
 378                                 s->session->compress_meth=0;
 379                         else
 380                                 s->session->compress_meth=
 381                                         s->s3->tmp.new_compression->id;
 382 #endif
 383                         if (!s->method->ssl3_enc->setup_key_block(s))
 384                                 {
 385                                 ret= -1;
 386                                 goto end;
 387                                 }
 388
 389                         if (!s->method->ssl3_enc->change_cipher_state(s,
 390                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 391                                 {
 392                                 ret= -1;
 393                                 goto end;
 394                                 }
 395
 396                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 397                         break;
 398
 399                 case SSL3_ST_CW_FINISHED_A:
 400                 case SSL3_ST_CW_FINISHED_B:
 401                         ret=dtls1_send_finished(s,
 402                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 403                                 s->method->ssl3_enc->client_finished_label,
 404                                 s->method->ssl3_enc->client_finished_label_len);
 405                         if (ret <= 0) goto end;
 406                         s->state=SSL3_ST_CW_FLUSH;
 407
 408                         /* clear flags */
 409                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 410                         if (s->hit)
 411                                 {
 412                                 s->s3->tmp.next_state=SSL_ST_OK;
 413                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 414                                         {
 415                                         s->state=SSL_ST_OK;
 416                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 417                                         s->s3->delay_buf_pop_ret=0;
 418                                         }
 419                                 }
 420                         else
 421                                 {
 422                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 423                                 }
 424                         s->init_num=0;
 425                         /* mark client_random uninitialized */
 426                         memset (s->s3->client_random,0,sizeof(s->s3->client_random));
 427                         break;
 428
 429                 case SSL3_ST_CR_FINISHED_A:
 430                 case SSL3_ST_CR_FINISHED_B:
 431
 432                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 433                                 SSL3_ST_CR_FINISHED_B);
 434                         if (ret <= 0) goto end;
 435
 436                         if (s->hit)
 437                                 s->state=SSL3_ST_CW_CHANGE_A;
 438                         else
 439                                 s->state=SSL_ST_OK;
 440                         s->init_num=0;
 441                         break;
 442
 443                 case SSL3_ST_CW_FLUSH:
 444                         /* number of bytes to be flushed */
 445                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 446                         if (num1 > 0)
 447                                 {
 448                                 s->rwstate=SSL_WRITING;
 449                                 num1=BIO_flush(s->wbio);
 450                                 if (num1 <= 0) { ret= -1; goto end; }
 451                                 s->rwstate=SSL_NOTHING;
 452                                 }
 453
 454                         s->state=s->s3->tmp.next_state;
 455                         break;
 456
 457                 case SSL_ST_OK:
 458                         /* clean a few things up */
 459                         ssl3_cleanup_key_block(s);
 460
 461 #if 0
 462                         if (s->init_buf != NULL)
 463                                 {
 464                                 BUF_MEM_free(s->init_buf);
 465                                 s->init_buf=NULL;
 466                                 }
 467 #endif
 468
 469                         /* If we are not 'joining' the last two packets,
 470                          * remove the buffering now */
 471                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 472                                 ssl_free_wbio_buffer(s);
 473                         /* else do it later in ssl3_write */
 474
 475                         s->init_num=0;
 476                         s->new_session=0;
 477
 478                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 479                         if (s->hit) s->ctx->stats.sess_hit++;
 480
 481                         ret=1;
 482                         /* s->server=0; */
 483                         s->handshake_func=dtls1_connect;
 484                         s->ctx->stats.sess_connect_good++;
 485
 486                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 487
 488                         /* done with handshaking */
 489                         s->d1->handshake_read_seq  = 0;
 490                         goto end;
 491                         /* break; */
 492
 493                 default:
 494                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 495                         ret= -1;
 496                         goto end;
 497                         /* break; */
 498                         }
 499
 500                 /* did we do anything */
 501                 if (!s->s3->tmp.reuse_message && !skip)
 502                         {
 503                         if (s->debug)
 504                                 {
 505                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 506                                         goto end;
 507                                 }
 508
 509                         if ((cb != NULL) && (s->state != state))
 510                                 {
 511                                 new_state=s->state;
 512                                 s->state=state;
 513                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 514                                 s->state=new_state;
 515                                 }
 516                         }
 517                 skip=0;
 518                 }
 519 end:
 520         s->in_handshake--;
 521         if (buf != NULL)
 522                 BUF_MEM_free(buf);
 523         if (cb != NULL)
 524                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 525         return(ret);
 526         }
 527
 528 int dtls1_client_hello(SSL *s)
 529         {
 530         unsigned char *buf;
 531         unsigned char *p,*d;
 532         unsigned int i,j;
 533         unsigned long Time,l;
 534         SSL_COMP *comp;
 535
 536         buf=(unsigned char *)s->init_buf->data;
 537         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 538                 {
 539                 if ((s->session == NULL) ||
 540                         (s->session->ssl_version != s->version) ||
 541                         (s->session->not_resumable))
 542                         {
 543                         if (!ssl_get_new_session(s,0))
 544                                 goto err;
 545                         }
 546                 /* else use the pre-loaded session */
 547
 548                 p=s->s3->client_random;
 549
 550                 /* if client_random is initialized, reuse it, we are
 551                  * required to use same upon reply to HelloVerify */
 552                 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
 553                 if (i==sizeof(s->s3->client_random))
 554                         {
 555                         Time=(unsigned long)time(NULL); /* Time */
 556                         l2n(Time,p);
 557                         RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4);
 558                         }
 559
 560                 /* Do the message type and length last */
 561                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 562
 563                 *(p++)=s->version>>8;
 564                 *(p++)=s->version&0xff;
 565                 s->client_version=s->version;
 566
 567                 /* Random stuff */
 568                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 569                 p+=SSL3_RANDOM_SIZE;
 570
 571                 /* Session ID */
 572                 if (s->new_session)
 573                         i=0;
 574                 else
 575                         i=s->session->session_id_length;
 576                 *(p++)=i;
 577                 if (i != 0)
 578                         {
 579                         if (i > sizeof s->session->session_id)
 580                                 {
 581                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 582                                 goto err;
 583                                 }
 584                         memcpy(p,s->session->session_id,i);
 585                         p+=i;
 586                         }
 587
 588                 /* cookie stuff */
 589                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 590                         {
 591                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 592                         goto err;
 593                         }
 594                 *(p++) = s->d1->cookie_len;
 595                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 596                 p += s->d1->cookie_len;
 597
 598                 /* Ciphers supported */
 599                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 600                 if (i == 0)
 601                         {
 602                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 603                         goto err;
 604                         }
 605                 s2n(i,p);
 606                 p+=i;
 607
 608                 /* COMPRESSION */
 609                 if (s->ctx->comp_methods == NULL)
 610                         j=0;
 611                 else
 612                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 613                 *(p++)=1+j;
 614                 for (i=0; i<j; i++)
 615                         {
 616                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 617                         *(p++)=comp->id;
 618                         }
 619                 *(p++)=0; /* Add the NULL method */
 620
 621                 l=(p-d);
 622                 d=buf;
 623
 624                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 625
 626                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 627                 /* number of bytes to write */
 628                 s->init_num=p-buf;
 629                 s->init_off=0;
 630
 631                 /* buffer the message to handle re-xmits */
 632                 dtls1_buffer_message(s, 0);
 633                 }
 634
 635         /* SSL3_ST_CW_CLNT_HELLO_B */
 636         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 637 err:
 638         return(-1);
 639         }
 640
 641 static int dtls1_get_hello_verify(SSL *s)
 642         {
 643         int n, al, ok = 0;
 644         unsigned char *data;
 645         unsigned int cookie_len;
 646
 647         n=s->method->ssl_get_message(s,
 648                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 649                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 650                 -1,
 651                 s->max_cert_list,
 652                 &ok);
 653
 654         if (!ok) return((int)n);
 655
 656         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 657                 {
 658                 s->d1->send_cookie = 0;
 659                 s->s3->tmp.reuse_message=1;
 660                 return(1);
 661                 }
 662
 663         data = (unsigned char *)s->init_msg;
 664
 665         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 666                 {
 667                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 668                 s->version=(s->version&0xff00)|data[1];
 669                 al = SSL_AD_PROTOCOL_VERSION;
 670                 goto f_err;
 671                 }
 672         data+=2;
 673
 674         cookie_len = *(data++);
 675         if ( cookie_len > sizeof(s->d1->cookie))
 676                 {
 677                 al=SSL_AD_ILLEGAL_PARAMETER;
 678                 goto f_err;
 679                 }
 680
 681         memcpy(s->d1->cookie, data, cookie_len);
 682         s->d1->cookie_len = cookie_len;
 683
 684         s->d1->send_cookie = 1;
 685         return 1;
 686
 687 f_err:
 688         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 689         return -1;
 690         }
 691
 692 int dtls1_send_client_key_exchange(SSL *s)
 693         {
 694         unsigned char *p,*d;
 695         int n;
 696         unsigned long alg_k;
 697 #ifndef OPENSSL_NO_RSA
 698         unsigned char *q;
 699         EVP_PKEY *pkey=NULL;
 700 #endif
 701 #ifndef OPENSSL_NO_KRB5
 702         KSSL_ERR kssl_err;
 703 #endif /* OPENSSL_NO_KRB5 */
 704
 705         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
 706                 {
 707                 d=(unsigned char *)s->init_buf->data;
 708                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 709
 710                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
 711
 712                 /* Fool emacs indentation */
 713                 if (0) {}
 714 #ifndef OPENSSL_NO_RSA
 715                 else if (alg_k & SSL_kRSA)
 716                         {
 717                         RSA *rsa;
 718                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 719
 720                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
 721                                 rsa=s->session->sess_cert->peer_rsa_tmp;
 722                         else
 723                                 {
 724                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 725                                 if ((pkey == NULL) ||
 726                                         (pkey->type != EVP_PKEY_RSA) ||
 727                                         (pkey->pkey.rsa == NULL))
 728                                         {
 729                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 730                                         goto err;
 731                                         }
 732                                 rsa=pkey->pkey.rsa;
 733                                 EVP_PKEY_free(pkey);
 734                                 }
 735
 736                         tmp_buf[0]=s->client_version>>8;
 737                         tmp_buf[1]=s->client_version&0xff;
 738                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
 739                                         goto err;
 740
 741                         s->session->master_key_length=sizeof tmp_buf;
 742
 743                         q=p;
 744                         /* Fix buf for TLS and [incidentally] DTLS */
 745                         if (s->version > SSL3_VERSION)
 746                                 p+=2;
 747                         n=RSA_public_encrypt(sizeof tmp_buf,
 748                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
 749 #ifdef PKCS1_CHECK
 750                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
 751                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
 752 #endif
 753                         if (n <= 0)
 754                                 {
 755                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
 756                                 goto err;
 757                                 }
 758
 759                         /* Fix buf for TLS and [incidentally] DTLS */
 760                         if (s->version > SSL3_VERSION)
 761                                 {
 762                                 s2n(n,q);
 763                                 n+=2;
 764                                 }
 765
 766                         s->session->master_key_length=
 767                                 s->method->ssl3_enc->generate_master_secret(s,
 768                                         s->session->master_key,
 769                                         tmp_buf,sizeof tmp_buf);
 770                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
 771                         }
 772 #endif
 773 #ifndef OPENSSL_NO_KRB5
 774                 else if (alg_k & SSL_kKRB5)
 775                         {
 776                         krb5_error_code krb5rc;
 777                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
 778                         /*  krb5_data   krb5_ap_req;  */
 779                         krb5_data       *enc_ticket;
 780                         krb5_data       authenticator, *authp = NULL;
 781                         EVP_CIPHER_CTX  ciph_ctx;
 782                         EVP_CIPHER      *enc = NULL;
 783                         unsigned char   iv[EVP_MAX_IV_LENGTH];
 784                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 785                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
 786                                                 + EVP_MAX_IV_LENGTH];
 787                         int             padl, outl = sizeof(epms);
 788
 789                         EVP_CIPHER_CTX_init(&ciph_ctx);
 790
 791 #ifdef KSSL_DEBUG
 792                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
 793                                 alg_k, SSL_kKRB5);
 794 #endif  /* KSSL_DEBUG */
 795
 796                         authp = NULL;
 797 #ifdef KRB5SENDAUTH
 798                         if (KRB5SENDAUTH)  authp = &authenticator;
 799 #endif  /* KRB5SENDAUTH */
 800
 801                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
 802                                 &kssl_err);
 803                         enc = kssl_map_enc(kssl_ctx->enctype);
 804                         if (enc == NULL)
 805                             goto err;
 806 #ifdef KSSL_DEBUG
 807                         {
 808                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
 809                         if (krb5rc && kssl_err.text)
 810                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
 811                         }
 812 #endif  /* KSSL_DEBUG */
 813
 814                         if (krb5rc)
 815                                 {
 816                                 ssl3_send_alert(s,SSL3_AL_FATAL,
 817                                                 SSL_AD_HANDSHAKE_FAILURE);
 818                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 819                                                 kssl_err.reason);
 820                                 goto err;
 821                                 }
 822
 823                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
 824                         **  in place of RFC 2712 KerberosWrapper, as in:
 825                         **
 826                         **  Send ticket (copy to *p, set n = length)
 827                         **  n = krb5_ap_req.length;
 828                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
 829                         **  if (krb5_ap_req.data)
 830                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
 831                         **
 832                         **  Now using real RFC 2712 KerberosWrapper
 833                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
 834                         **  Note: 2712 "opaque" types are here replaced
 835                         **  with a 2-byte length followed by the value.
 836                         **  Example:
 837                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
 838                         **  Where "xx xx" = length bytes.  Shown here with
 839                         **  optional authenticator omitted.
 840                         */
 841
 842                         /*  KerberosWrapper.Ticket              */
 843                         s2n(enc_ticket->length,p);
 844                         memcpy(p, enc_ticket->data, enc_ticket->length);
 845                         p+= enc_ticket->length;
 846                         n = enc_ticket->length + 2;
 847
 848                         /*  KerberosWrapper.Authenticator       */
 849                         if (authp  &&  authp->length)
 850                                 {
 851                                 s2n(authp->length,p);
 852                                 memcpy(p, authp->data, authp->length);
 853                                 p+= authp->length;
 854                                 n+= authp->length + 2;
 855
 856                                 free(authp->data);
 857                                 authp->data = NULL;
 858                                 authp->length = 0;
 859                                 }
 860                         else
 861                                 {
 862                                 s2n(0,p);/*  null authenticator length  */
 863                                 n+=2;
 864                                 }
 865
 866                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
 867                             goto err;
 868
 869                         /*  20010420 VRS.  Tried it this way; failed.
 870                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
 871                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
 872                         **                              kssl_ctx->length);
 873                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
 874                         */
 875
 876                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
 877                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
 878                                 kssl_ctx->key,iv);
 879                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
 880                                 sizeof tmp_buf);
 881                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
 882                         outl += padl;
 883                         if (outl > sizeof epms)
 884                                 {
 885                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 886                                 goto err;
 887                                 }
 888                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
 889
 890                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
 891                         s2n(outl,p);
 892                         memcpy(p, epms, outl);
 893                         p+=outl;
 894                         n+=outl + 2;
 895
 896                         s->session->master_key_length=
 897                                 s->method->ssl3_enc->generate_master_secret(s,
 898                                         s->session->master_key,
 899                                         tmp_buf, sizeof tmp_buf);
 900
 901                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
 902                         OPENSSL_cleanse(epms, outl);
 903                         }
 904 #endif
 905 #ifndef OPENSSL_NO_DH
 906                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 907                         {
 908                         DH *dh_srvr,*dh_clnt;
 909
 910                         if (s->session->sess_cert->peer_dh_tmp != NULL)
 911                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
 912                         else
 913                                 {
 914                                 /* we get them from the cert */
 915                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 916                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
 917                                 goto err;
 918                                 }
 919
 920                         /* generate a new random key */
 921                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
 922                                 {
 923                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 924                                 goto err;
 925                                 }
 926                         if (!DH_generate_key(dh_clnt))
 927                                 {
 928                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 929                                 goto err;
 930                                 }
 931
 932                         /* use the 'p' output buffer for the DH key, but
 933                          * make sure to clear it out afterwards */
 934
 935                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
 936
 937                         if (n <= 0)
 938                                 {
 939                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 940                                 goto err;
 941                                 }
 942
 943                         /* generate master key from the result */
 944                         s->session->master_key_length=
 945                                 s->method->ssl3_enc->generate_master_secret(s,
 946                                         s->session->master_key,p,n);
 947                         /* clean up */
 948                         memset(p,0,n);
 949
 950                         /* send off the data */
 951                         n=BN_num_bytes(dh_clnt->pub_key);
 952                         s2n(n,p);
 953                         BN_bn2bin(dh_clnt->pub_key,p);
 954                         n+=2;
 955
 956                         DH_free(dh_clnt);
 957
 958                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
 959                         }
 960 #endif
 961                 else
 962                         {
 963                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 964                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 965                         goto err;
 966                         }
 967
 968                 d = dtls1_set_message_header(s, d,
 969                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
 970                 /*
 971                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
 972                  l2n3(n,d);
 973                  l2n(s->d1->handshake_write_seq,d);
 974                  s->d1->handshake_write_seq++;
 975                 */
 976
 977                 s->state=SSL3_ST_CW_KEY_EXCH_B;
 978                 /* number of bytes to write */
 979                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
 980                 s->init_off=0;
 981
 982                 /* buffer the message to handle re-xmits */
 983                 dtls1_buffer_message(s, 0);
 984                 }
 985
 986         /* SSL3_ST_CW_KEY_EXCH_B */
 987         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 988 err:
 989         return(-1);
 990         }
 991
 992 int dtls1_send_client_verify(SSL *s)
 993         {
 994         unsigned char *p,*d;
 995         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 996         EVP_PKEY *pkey;
 997 #ifndef OPENSSL_NO_RSA
 998         unsigned u=0;
 999 #endif
1000         unsigned long n;
1001 #ifndef OPENSSL_NO_DSA
1002         int j;
1003 #endif
1004
1005         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1006                 {
1007                 d=(unsigned char *)s->init_buf->data;
1008                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1009                 pkey=s->cert->key->privatekey;
1010
1011                 s->method->ssl3_enc->cert_verify_mac(s,
1012                 NID_sha1,
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                                 NID_md5,
1020                                 &(data[0]));
1021                         if (RSA_sign(NID_md5_sha1, data,
1022                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1023                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1024                                 {
1025                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1026                                 goto err;
1027                                 }
1028                         s2n(u,p);
1029                         n=u+2;
1030                         }
1031                 else
1032 #endif
1033 #ifndef OPENSSL_NO_DSA
1034                         if (pkey->type == EVP_PKEY_DSA)
1035                         {
1036                         if (!DSA_sign(pkey->save_type,
1037                                 &(data[MD5_DIGEST_LENGTH]),
1038                                 SHA_DIGEST_LENGTH,&(p[2]),
1039                                 (unsigned int *)&j,pkey->pkey.dsa))
1040                                 {
1041                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1042                                 goto err;
1043                                 }
1044                         s2n(j,p);
1045                         n=j+2;
1046                         }
1047                 else
1048 #endif
1049                         {
1050                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1051                         goto err;
1052                         }
1053
1054                 d = dtls1_set_message_header(s, d,
1055                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1056
1057                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1058                 s->init_off=0;
1059
1060                 /* buffer the message to handle re-xmits */
1061                 dtls1_buffer_message(s, 0);
1062
1063                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1064                 }
1065
1066         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1067         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1068 err:
1069         return(-1);
1070         }
1071
1072 int dtls1_send_client_certificate(SSL *s)
1073         {
1074         X509 *x509=NULL;
1075         EVP_PKEY *pkey=NULL;
1076         int i;
1077         unsigned long l;
1078
1079         if (s->state == SSL3_ST_CW_CERT_A)
1080                 {
1081                 if ((s->cert == NULL) ||
1082                         (s->cert->key->x509 == NULL) ||
1083                         (s->cert->key->privatekey == NULL))
1084                         s->state=SSL3_ST_CW_CERT_B;
1085                 else
1086                         s->state=SSL3_ST_CW_CERT_C;
1087                 }
1088
1089         /* We need to get a client cert */
1090         if (s->state == SSL3_ST_CW_CERT_B)
1091                 {
1092                 /* If we get an error, we need to
1093                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1094                  * We then get retied later */
1095                 i=0;
1096                 if (s->ctx->client_cert_cb != NULL)
1097                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1098                 if (i < 0)
1099                         {
1100                         s->rwstate=SSL_X509_LOOKUP;
1101                         return(-1);
1102                         }
1103                 s->rwstate=SSL_NOTHING;
1104                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1105                         {
1106                         s->state=SSL3_ST_CW_CERT_B;
1107                         if (    !SSL_use_certificate(s,x509) ||
1108                                 !SSL_use_PrivateKey(s,pkey))
1109                                 i=0;
1110                         }
1111                 else if (i == 1)
1112                         {
1113                         i=0;
1114                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1115                         }
1116
1117                 if (x509 != NULL) X509_free(x509);
1118                 if (pkey != NULL) EVP_PKEY_free(pkey);
1119                 if (i == 0)
1120                         {
1121                         if (s->version == SSL3_VERSION)
1122                                 {
1123                                 s->s3->tmp.cert_req=0;
1124                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1125                                 return(1);
1126                                 }
1127                         else
1128                                 {
1129                                 s->s3->tmp.cert_req=2;
1130                                 }
1131                         }
1132
1133                 /* Ok, we have a cert */
1134                 s->state=SSL3_ST_CW_CERT_C;
1135                 }
1136
1137         if (s->state == SSL3_ST_CW_CERT_C)
1138                 {
1139                 s->state=SSL3_ST_CW_CERT_D;
1140                 l=dtls1_output_cert_chain(s,
1141                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1142                 s->init_num=(int)l;
1143                 s->init_off=0;
1144
1145                 /* set header called by dtls1_output_cert_chain() */
1146
1147                 /* buffer the message to handle re-xmits */
1148                 dtls1_buffer_message(s, 0);
1149                 }
1150         /* SSL3_ST_CW_CERT_D */
1151         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1152         }
1153
1154