ssl/d1_clnt.c

   1 /* ssl/d1_clnt.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2005 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #include <openssl/buffer.h>
 119 #include <openssl/rand.h>
 120 #include <openssl/objects.h>
 121 #include <openssl/evp.h>
 122 #include <openssl/md5.h>
 123 #include <openssl/bn.h>
 124 #ifndef OPENSSL_NO_DH
 125 #include <openssl/dh.h>
 126 #endif
 127
 128 static const SSL_METHOD *dtls1_get_client_method(int ver);
 129 static int dtls1_get_hello_verify(SSL *s);
 130
 131 static const SSL_METHOD *dtls1_get_client_method(int ver)
 132         {
 133         if (ver == DTLS1_VERSION)
 134                 return(DTLSv1_client_method());
 135         else
 136                 return(NULL);
 137         }
 138
 139 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
 140                         ssl_undefined_function,
 141                         dtls1_connect,
 142                         dtls1_get_client_method)
 143
 144 int dtls1_connect(SSL *s)
 145         {
 146         BUF_MEM *buf=NULL;
 147         unsigned long Time=(unsigned long)time(NULL),l;
 148         long num1;
 149         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 150         int ret= -1;
 151         int new_state,state,skip=0;;
 152
 153         RAND_add(&Time,sizeof(Time),0);
 154         ERR_clear_error();
 155         clear_sys_error();
 156
 157         if (s->info_callback != NULL)
 158                 cb=s->info_callback;
 159         else if (s->ctx->info_callback != NULL)
 160                 cb=s->ctx->info_callback;
 161
 162         s->in_handshake++;
 163         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 164
 165         for (;;)
 166                 {
 167                 state=s->state;
 168
 169                 switch(s->state)
 170                         {
 171                 case SSL_ST_RENEGOTIATE:
 172                         s->new_session=1;
 173                         s->state=SSL_ST_CONNECT;
 174                         s->ctx->stats.sess_connect_renegotiate++;
 175                         /* break */
 176                 case SSL_ST_BEFORE:
 177                 case SSL_ST_CONNECT:
 178                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 179                 case SSL_ST_OK|SSL_ST_CONNECT:
 180
 181                         s->server=0;
 182                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 183
 184                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00))
 185                                 {
 186                                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 187                                 ret = -1;
 188                                 goto end;
 189                                 }
 190
 191                         /* s->version=SSL3_VERSION; */
 192                         s->type=SSL_ST_CONNECT;
 193
 194                         if (s->init_buf == NULL)
 195                                 {
 196                                 if ((buf=BUF_MEM_new()) == NULL)
 197                                         {
 198                                         ret= -1;
 199                                         goto end;
 200                                         }
 201                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 202                                         {
 203                                         ret= -1;
 204                                         goto end;
 205                                         }
 206                                 s->init_buf=buf;
 207                                 buf=NULL;
 208                                 }
 209
 210                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 211
 212                         /* setup buffing BIO */
 213                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 214
 215                         /* don't push the buffering BIO quite yet */
 216
 217                         ssl3_init_finished_mac(s);
 218
 219                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 220                         s->ctx->stats.sess_connect++;
 221                         s->init_num=0;
 222                         break;
 223
 224                 case SSL3_ST_CW_CLNT_HELLO_A:
 225                 case SSL3_ST_CW_CLNT_HELLO_B:
 226
 227                         s->shutdown=0;
 228                         ret=dtls1_client_hello(s);
 229                         if (ret <= 0) goto end;
 230
 231                         if ( s->d1->send_cookie)
 232                                 {
 233                                 s->state=SSL3_ST_CW_FLUSH;
 234                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 235                                 }
 236                         else
 237                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 238
 239                         s->init_num=0;
 240
 241                         /* turn on buffering for the next lot of output */
 242                         if (s->bbio != s->wbio)
 243                                 s->wbio=BIO_push(s->bbio,s->wbio);
 244
 245                         break;
 246
 247                 case SSL3_ST_CR_SRVR_HELLO_A:
 248                 case SSL3_ST_CR_SRVR_HELLO_B:
 249                         ret=ssl3_get_server_hello(s);
 250                         if (ret <= 0) goto end;
 251                         else
 252                                 {
 253                                 if (s->hit)
 254                                         s->state=SSL3_ST_CR_FINISHED_A;
 255                                 else
 256                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 257                                 }
 258                         s->init_num=0;
 259                         break;
 260
 261                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 262                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 263
 264                         ret = dtls1_get_hello_verify(s);
 265                         if ( ret <= 0)
 266                                 goto end;
 267                         if ( s->d1->send_cookie) /* start again, with a cookie */
 268                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 269                         else
 270                                 s->state = SSL3_ST_CR_CERT_A;
 271                         s->init_num = 0;
 272                         break;
 273
 274                 case SSL3_ST_CR_CERT_A:
 275                 case SSL3_ST_CR_CERT_B:
 276                         /* Check if it is anon DH */
 277                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 278                                 {
 279                                 ret=ssl3_get_server_certificate(s);
 280                                 if (ret <= 0) goto end;
 281                                 }
 282                         else
 283                                 skip=1;
 284                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 285                         s->init_num=0;
 286                         break;
 287
 288                 case SSL3_ST_CR_KEY_EXCH_A:
 289                 case SSL3_ST_CR_KEY_EXCH_B:
 290                         ret=ssl3_get_key_exchange(s);
 291                         if (ret <= 0) goto end;
 292                         s->state=SSL3_ST_CR_CERT_REQ_A;
 293                         s->init_num=0;
 294
 295                         /* at this point we check that we have the
 296                          * required stuff from the server */
 297                         if (!ssl3_check_cert_and_algorithm(s))
 298                                 {
 299                                 ret= -1;
 300                                 goto end;
 301                                 }
 302                         break;
 303
 304                 case SSL3_ST_CR_CERT_REQ_A:
 305                 case SSL3_ST_CR_CERT_REQ_B:
 306                         ret=ssl3_get_certificate_request(s);
 307                         if (ret <= 0) goto end;
 308                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 309                         s->init_num=0;
 310                         break;
 311
 312                 case SSL3_ST_CR_SRVR_DONE_A:
 313                 case SSL3_ST_CR_SRVR_DONE_B:
 314                         ret=ssl3_get_server_done(s);
 315                         if (ret <= 0) goto end;
 316                         if (s->s3->tmp.cert_req)
 317                                 s->state=SSL3_ST_CW_CERT_A;
 318                         else
 319                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 320                         s->init_num=0;
 321
 322                         break;
 323
 324                 case SSL3_ST_CW_CERT_A:
 325                 case SSL3_ST_CW_CERT_B:
 326                 case SSL3_ST_CW_CERT_C:
 327                 case SSL3_ST_CW_CERT_D:
 328                         ret=dtls1_send_client_certificate(s);
 329                         if (ret <= 0) goto end;
 330                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 331                         s->init_num=0;
 332                         break;
 333
 334                 case SSL3_ST_CW_KEY_EXCH_A:
 335                 case SSL3_ST_CW_KEY_EXCH_B:
 336                         ret=dtls1_send_client_key_exchange(s);
 337                         if (ret <= 0) goto end;
 338                         l=s->s3->tmp.new_cipher->algorithms;
 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                         break;
 426
 427                 case SSL3_ST_CR_FINISHED_A:
 428                 case SSL3_ST_CR_FINISHED_B:
 429
 430                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 431                                 SSL3_ST_CR_FINISHED_B);
 432                         if (ret <= 0) goto end;
 433
 434                         if (s->hit)
 435                                 s->state=SSL3_ST_CW_CHANGE_A;
 436                         else
 437                                 s->state=SSL_ST_OK;
 438                         s->init_num=0;
 439                         break;
 440
 441                 case SSL3_ST_CW_FLUSH:
 442                         /* number of bytes to be flushed */
 443                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 444                         if (num1 > 0)
 445                                 {
 446                                 s->rwstate=SSL_WRITING;
 447                                 num1=BIO_flush(s->wbio);
 448                                 if (num1 <= 0) { ret= -1; goto end; }
 449                                 s->rwstate=SSL_NOTHING;
 450                                 }
 451
 452                         s->state=s->s3->tmp.next_state;
 453                         break;
 454
 455                 case SSL_ST_OK:
 456                         /* clean a few things up */
 457                         ssl3_cleanup_key_block(s);
 458
 459 #if 0
 460                         if (s->init_buf != NULL)
 461                                 {
 462                                 BUF_MEM_free(s->init_buf);
 463                                 s->init_buf=NULL;
 464                                 }
 465 #endif
 466
 467                         /* If we are not 'joining' the last two packets,
 468                          * remove the buffering now */
 469                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 470                                 ssl_free_wbio_buffer(s);
 471                         /* else do it later in ssl3_write */
 472
 473                         s->init_num=0;
 474                         s->new_session=0;
 475
 476                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 477                         if (s->hit) s->ctx->stats.sess_hit++;
 478
 479                         ret=1;
 480                         /* s->server=0; */
 481                         s->handshake_func=dtls1_connect;
 482                         s->ctx->stats.sess_connect_good++;
 483
 484                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 485
 486                         /* done with handshaking */
 487                         s->d1->handshake_read_seq  = 0;
 488                         goto end;
 489                         /* break; */
 490
 491                 default:
 492                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 493                         ret= -1;
 494                         goto end;
 495                         /* break; */
 496                         }
 497
 498                 /* did we do anything */
 499                 if (!s->s3->tmp.reuse_message && !skip)
 500                         {
 501                         if (s->debug)
 502                                 {
 503                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 504                                         goto end;
 505                                 }
 506
 507                         if ((cb != NULL) && (s->state != state))
 508                                 {
 509                                 new_state=s->state;
 510                                 s->state=state;
 511                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 512                                 s->state=new_state;
 513                                 }
 514                         }
 515                 skip=0;
 516                 }
 517 end:
 518         s->in_handshake--;
 519         if (buf != NULL)
 520                 BUF_MEM_free(buf);
 521         if (cb != NULL)
 522                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 523         return(ret);
 524         }
 525
 526 int dtls1_client_hello(SSL *s)
 527         {
 528         unsigned char *buf;
 529         unsigned char *p,*d;
 530         unsigned int i,j;
 531         unsigned long Time,l;
 532         SSL_COMP *comp;
 533
 534         buf=(unsigned char *)s->init_buf->data;
 535         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 536                 {
 537                 if ((s->session == NULL) ||
 538                         (s->session->ssl_version != s->version) ||
 539                         (s->session->not_resumable))
 540                         {
 541                         if (!ssl_get_new_session(s,0))
 542                                 goto err;
 543                         }
 544                 /* else use the pre-loaded session */
 545
 546                 p=s->s3->client_random;
 547                 Time=(unsigned long)time(NULL);                 /* Time */
 548                 l2n(Time,p);
 549                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 550
 551                 /* Do the message type and length last */
 552                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 553
 554                 *(p++)=s->version>>8;
 555                 *(p++)=s->version&0xff;
 556                 s->client_version=s->version;
 557
 558                 /* Random stuff */
 559                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 560                 p+=SSL3_RANDOM_SIZE;
 561
 562                 /* Session ID */
 563                 if (s->new_session)
 564                         i=0;
 565                 else
 566                         i=s->session->session_id_length;
 567                 *(p++)=i;
 568                 if (i != 0)
 569                         {
 570                         if (i > sizeof s->session->session_id)
 571                                 {
 572                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 573                                 goto err;
 574                                 }
 575                         memcpy(p,s->session->session_id,i);
 576                         p+=i;
 577                         }
 578
 579                 /* cookie stuff */
 580                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 581                         {
 582                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 583                         goto err;
 584                         }
 585                 *(p++) = s->d1->cookie_len;
 586                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 587                 p += s->d1->cookie_len;
 588
 589                 /* Ciphers supported */
 590                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 591                 if (i == 0)
 592                         {
 593                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 594                         goto err;
 595                         }
 596                 s2n(i,p);
 597                 p+=i;
 598
 599                 /* COMPRESSION */
 600                 if (s->ctx->comp_methods == NULL)
 601                         j=0;
 602                 else
 603                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 604                 *(p++)=1+j;
 605                 for (i=0; i<j; i++)
 606                         {
 607                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 608                         *(p++)=comp->id;
 609                         }
 610                 *(p++)=0; /* Add the NULL method */
 611
 612                 l=(p-d);
 613                 d=buf;
 614
 615                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 616
 617                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 618                 /* number of bytes to write */
 619                 s->init_num=p-buf;
 620                 s->init_off=0;
 621
 622                 /* buffer the message to handle re-xmits */
 623                 dtls1_buffer_message(s, 0);
 624                 }
 625
 626         /* SSL3_ST_CW_CLNT_HELLO_B */
 627         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 628 err:
 629         return(-1);
 630         }
 631
 632 static int dtls1_get_hello_verify(SSL *s)
 633         {
 634         int n, al, ok = 0;
 635         unsigned char *data;
 636         unsigned int cookie_len;
 637
 638         n=s->method->ssl_get_message(s,
 639                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 640                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 641                 -1,
 642                 s->max_cert_list,
 643                 &ok);
 644
 645         if (!ok) return((int)n);
 646
 647         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 648                 {
 649                 s->d1->send_cookie = 0;
 650                 s->s3->tmp.reuse_message=1;
 651                 return(1);
 652                 }
 653
 654         data = (unsigned char *)s->init_msg;
 655
 656         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 657                 {
 658                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 659                 s->version=(s->version&0xff00)|data[1];
 660                 al = SSL_AD_PROTOCOL_VERSION;
 661                 goto f_err;
 662                 }
 663         data+=2;
 664
 665         cookie_len = *(data++);
 666         if ( cookie_len > sizeof(s->d1->cookie))
 667                 {
 668                 al=SSL_AD_ILLEGAL_PARAMETER;
 669                 goto f_err;
 670                 }
 671
 672         memcpy(s->d1->cookie, data, cookie_len);
 673         s->d1->cookie_len = cookie_len;
 674
 675         s->d1->send_cookie = 1;
 676         return 1;
 677
 678 f_err:
 679         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 680         return -1;
 681         }
 682
 683 int dtls1_send_client_key_exchange(SSL *s)
 684         {
 685         unsigned char *p,*d;
 686         int n;
 687         unsigned long l;
 688 #ifndef OPENSSL_NO_RSA
 689         unsigned char *q;
 690         EVP_PKEY *pkey=NULL;
 691 #endif
 692 #ifndef OPENSSL_NO_KRB5
 693         KSSL_ERR kssl_err;
 694 #endif /* OPENSSL_NO_KRB5 */
 695
 696         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
 697                 {
 698                 d=(unsigned char *)s->init_buf->data;
 699                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 700
 701                 l=s->s3->tmp.new_cipher->algorithms;
 702
 703                 /* Fool emacs indentation */
 704                 if (0) {}
 705 #ifndef OPENSSL_NO_RSA
 706                 else if (l & SSL_kRSA)
 707                         {
 708                         RSA *rsa;
 709                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 710
 711                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
 712                                 rsa=s->session->sess_cert->peer_rsa_tmp;
 713                         else
 714                                 {
 715                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 716                                 if ((pkey == NULL) ||
 717                                         (pkey->type != EVP_PKEY_RSA) ||
 718                                         (pkey->pkey.rsa == NULL))
 719                                         {
 720                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 721                                         goto err;
 722                                         }
 723                                 rsa=pkey->pkey.rsa;
 724                                 EVP_PKEY_free(pkey);
 725                                 }
 726
 727                         tmp_buf[0]=s->client_version>>8;
 728                         tmp_buf[1]=s->client_version&0xff;
 729                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
 730                                         goto err;
 731
 732                         s->session->master_key_length=sizeof tmp_buf;
 733
 734                         q=p;
 735                         /* Fix buf for TLS and beyond */
 736                         if (s->version > SSL3_VERSION)
 737                                 p+=2;
 738                         n=RSA_public_encrypt(sizeof tmp_buf,
 739                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
 740 #ifdef PKCS1_CHECK
 741                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
 742                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
 743 #endif
 744                         if (n <= 0)
 745                                 {
 746                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
 747                                 goto err;
 748                                 }
 749
 750                         /* Fix buf for TLS and beyond */
 751                         if (s->version > SSL3_VERSION)
 752                                 {
 753                                 s2n(n,q);
 754                                 n+=2;
 755                                 }
 756
 757                         s->session->master_key_length=
 758                                 s->method->ssl3_enc->generate_master_secret(s,
 759                                         s->session->master_key,
 760                                         tmp_buf,sizeof tmp_buf);
 761                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
 762                         }
 763 #endif
 764 #ifndef OPENSSL_NO_KRB5
 765                 else if (l & SSL_kKRB5)
 766                         {
 767                         krb5_error_code krb5rc;
 768                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
 769                         /*  krb5_data   krb5_ap_req;  */
 770                         krb5_data       *enc_ticket;
 771                         krb5_data       authenticator, *authp = NULL;
 772                         EVP_CIPHER_CTX  ciph_ctx;
 773                         EVP_CIPHER      *enc = NULL;
 774                         unsigned char   iv[EVP_MAX_IV_LENGTH];
 775                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 776                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
 777                                                 + EVP_MAX_IV_LENGTH];
 778                         int             padl, outl = sizeof(epms);
 779
 780                         EVP_CIPHER_CTX_init(&ciph_ctx);
 781
 782 #ifdef KSSL_DEBUG
 783                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
 784                                 l, SSL_kKRB5);
 785 #endif  /* KSSL_DEBUG */
 786
 787                         authp = NULL;
 788 #ifdef KRB5SENDAUTH
 789                         if (KRB5SENDAUTH)  authp = &authenticator;
 790 #endif  /* KRB5SENDAUTH */
 791
 792                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
 793                                 &kssl_err);
 794                         enc = kssl_map_enc(kssl_ctx->enctype);
 795                         if (enc == NULL)
 796                             goto err;
 797 #ifdef KSSL_DEBUG
 798                         {
 799                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
 800                         if (krb5rc && kssl_err.text)
 801                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
 802                         }
 803 #endif  /* KSSL_DEBUG */
 804
 805                         if (krb5rc)
 806                                 {
 807                                 ssl3_send_alert(s,SSL3_AL_FATAL,
 808                                                 SSL_AD_HANDSHAKE_FAILURE);
 809                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 810                                                 kssl_err.reason);
 811                                 goto err;
 812                                 }
 813
 814                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
 815                         **  in place of RFC 2712 KerberosWrapper, as in:
 816                         **
 817                         **  Send ticket (copy to *p, set n = length)
 818                         **  n = krb5_ap_req.length;
 819                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
 820                         **  if (krb5_ap_req.data)
 821                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
 822                         **
 823                         **  Now using real RFC 2712 KerberosWrapper
 824                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
 825                         **  Note: 2712 "opaque" types are here replaced
 826                         **  with a 2-byte length followed by the value.
 827                         **  Example:
 828                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
 829                         **  Where "xx xx" = length bytes.  Shown here with
 830                         **  optional authenticator omitted.
 831                         */
 832
 833                         /*  KerberosWrapper.Ticket              */
 834                         s2n(enc_ticket->length,p);
 835                         memcpy(p, enc_ticket->data, enc_ticket->length);
 836                         p+= enc_ticket->length;
 837                         n = enc_ticket->length + 2;
 838
 839                         /*  KerberosWrapper.Authenticator       */
 840                         if (authp  &&  authp->length)
 841                                 {
 842                                 s2n(authp->length,p);
 843                                 memcpy(p, authp->data, authp->length);
 844                                 p+= authp->length;
 845                                 n+= authp->length + 2;
 846
 847                                 free(authp->data);
 848                                 authp->data = NULL;
 849                                 authp->length = 0;
 850                                 }
 851                         else
 852                                 {
 853                                 s2n(0,p);/*  null authenticator length  */
 854                                 n+=2;
 855                                 }
 856
 857                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
 858                             goto err;
 859
 860                         /*  20010420 VRS.  Tried it this way; failed.
 861                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
 862                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
 863                         **                              kssl_ctx->length);
 864                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
 865                         */
 866
 867                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
 868                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
 869                                 kssl_ctx->key,iv);
 870                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
 871                                 sizeof tmp_buf);
 872                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
 873                         outl += padl;
 874                         if (outl > sizeof epms)
 875                                 {
 876                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 877                                 goto err;
 878                                 }
 879                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
 880
 881                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
 882                         s2n(outl,p);
 883                         memcpy(p, epms, outl);
 884                         p+=outl;
 885                         n+=outl + 2;
 886
 887                         s->session->master_key_length=
 888                                 s->method->ssl3_enc->generate_master_secret(s,
 889                                         s->session->master_key,
 890                                         tmp_buf, sizeof tmp_buf);
 891
 892                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
 893                         OPENSSL_cleanse(epms, outl);
 894                         }
 895 #endif
 896 #ifndef OPENSSL_NO_DH
 897                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 898                         {
 899                         DH *dh_srvr,*dh_clnt;
 900
 901                         if (s->session->sess_cert->peer_dh_tmp != NULL)
 902                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
 903                         else
 904                                 {
 905                                 /* we get them from the cert */
 906                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 907                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
 908                                 goto err;
 909                                 }
 910
 911                         /* generate a new random key */
 912                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
 913                                 {
 914                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 915                                 goto err;
 916                                 }
 917                         if (!DH_generate_key(dh_clnt))
 918                                 {
 919                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 920                                 goto err;
 921                                 }
 922
 923                         /* use the 'p' output buffer for the DH key, but
 924                          * make sure to clear it out afterwards */
 925
 926                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
 927
 928                         if (n <= 0)
 929                                 {
 930                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 931                                 goto err;
 932                                 }
 933
 934                         /* generate master key from the result */
 935                         s->session->master_key_length=
 936                                 s->method->ssl3_enc->generate_master_secret(s,
 937                                         s->session->master_key,p,n);
 938                         /* clean up */
 939                         memset(p,0,n);
 940
 941                         /* send off the data */
 942                         n=BN_num_bytes(dh_clnt->pub_key);
 943                         s2n(n,p);
 944                         BN_bn2bin(dh_clnt->pub_key,p);
 945                         n+=2;
 946
 947                         DH_free(dh_clnt);
 948
 949                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
 950                         }
 951 #endif
 952                 else
 953                         {
 954                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 955                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 956                         goto err;
 957                         }
 958
 959                 d = dtls1_set_message_header(s, d,
 960                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
 961                 /*
 962                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
 963                  l2n3(n,d);
 964                  l2n(s->d1->handshake_write_seq,d);
 965                  s->d1->handshake_write_seq++;
 966                 */
 967
 968                 s->state=SSL3_ST_CW_KEY_EXCH_B;
 969                 /* number of bytes to write */
 970                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
 971                 s->init_off=0;
 972
 973                 /* buffer the message to handle re-xmits */
 974                 dtls1_buffer_message(s, 0);
 975                 }
 976
 977         /* SSL3_ST_CW_KEY_EXCH_B */
 978         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 979 err:
 980         return(-1);
 981         }
 982
 983 int dtls1_send_client_verify(SSL *s)
 984         {
 985         unsigned char *p,*d;
 986         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 987         EVP_PKEY *pkey;
 988 #ifndef OPENSSL_NO_RSA
 989         unsigned u=0;
 990 #endif
 991         unsigned long n;
 992 #ifndef OPENSSL_NO_DSA
 993         int j;
 994 #endif
 995
 996         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
 997                 {
 998                 d=(unsigned char *)s->init_buf->data;
 999                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1000                 pkey=s->cert->key->privatekey;
1001
1002                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1003                         &(data[MD5_DIGEST_LENGTH]));
1004
1005 #ifndef OPENSSL_NO_RSA
1006                 if (pkey->type == EVP_PKEY_RSA)
1007                         {
1008                         s->method->ssl3_enc->cert_verify_mac(s,
1009                                 &(s->s3->finish_dgst1),&(data[0]));
1010                         if (RSA_sign(NID_md5_sha1, data,
1011                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1012                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1013                                 {
1014                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1015                                 goto err;
1016                                 }
1017                         s2n(u,p);
1018                         n=u+2;
1019                         }
1020                 else
1021 #endif
1022 #ifndef OPENSSL_NO_DSA
1023                         if (pkey->type == EVP_PKEY_DSA)
1024                         {
1025                         if (!DSA_sign(pkey->save_type,
1026                                 &(data[MD5_DIGEST_LENGTH]),
1027                                 SHA_DIGEST_LENGTH,&(p[2]),
1028                                 (unsigned int *)&j,pkey->pkey.dsa))
1029                                 {
1030                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1031                                 goto err;
1032                                 }
1033                         s2n(j,p);
1034                         n=j+2;
1035                         }
1036                 else
1037 #endif
1038                         {
1039                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1040                         goto err;
1041                         }
1042
1043                 d = dtls1_set_message_header(s, d,
1044                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1045
1046                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1047                 s->init_off=0;
1048
1049                 /* buffer the message to handle re-xmits */
1050                 dtls1_buffer_message(s, 0);
1051
1052                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1053                 }
1054
1055         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1056         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1057 err:
1058         return(-1);
1059         }
1060
1061 int dtls1_send_client_certificate(SSL *s)
1062         {
1063         X509 *x509=NULL;
1064         EVP_PKEY *pkey=NULL;
1065         int i;
1066         unsigned long l;
1067
1068         if (s->state == SSL3_ST_CW_CERT_A)
1069                 {
1070                 if ((s->cert == NULL) ||
1071                         (s->cert->key->x509 == NULL) ||
1072                         (s->cert->key->privatekey == NULL))
1073                         s->state=SSL3_ST_CW_CERT_B;
1074                 else
1075                         s->state=SSL3_ST_CW_CERT_C;
1076                 }
1077
1078         /* We need to get a client cert */
1079         if (s->state == SSL3_ST_CW_CERT_B)
1080                 {
1081                 /* If we get an error, we need to
1082                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1083                  * We then get retied later */
1084                 i=0;
1085                 if (s->ctx->client_cert_cb != NULL)
1086                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1087                 if (i < 0)
1088                         {
1089                         s->rwstate=SSL_X509_LOOKUP;
1090                         return(-1);
1091                         }
1092                 s->rwstate=SSL_NOTHING;
1093                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1094                         {
1095                         s->state=SSL3_ST_CW_CERT_B;
1096                         if (    !SSL_use_certificate(s,x509) ||
1097                                 !SSL_use_PrivateKey(s,pkey))
1098                                 i=0;
1099                         }
1100                 else if (i == 1)
1101                         {
1102                         i=0;
1103                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1104                         }
1105
1106                 if (x509 != NULL) X509_free(x509);
1107                 if (pkey != NULL) EVP_PKEY_free(pkey);
1108                 if (i == 0)
1109                         {
1110                         if (s->version == SSL3_VERSION)
1111                                 {
1112                                 s->s3->tmp.cert_req=0;
1113                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1114                                 return(1);
1115                                 }
1116                         else
1117                                 {
1118                                 s->s3->tmp.cert_req=2;
1119                                 }
1120                         }
1121
1122                 /* Ok, we have a cert */
1123                 s->state=SSL3_ST_CW_CERT_C;
1124                 }
1125
1126         if (s->state == SSL3_ST_CW_CERT_C)
1127                 {
1128                 s->state=SSL3_ST_CW_CERT_D;
1129                 l=dtls1_output_cert_chain(s,
1130                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1131                 s->init_num=(int)l;
1132                 s->init_off=0;
1133
1134                 /* set header called by dtls1_output_cert_chain() */
1135
1136                 /* buffer the message to handle re-xmits */
1137                 dtls1_buffer_message(s, 0);
1138                 }
1139         /* SSL3_ST_CW_CERT_D */
1140         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1141         }
1142
1143