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 #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);
 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->algorithm_auth & 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                         /* EAY EAY EAY need to check for DH fix cert
 339                          * sent back */
 340                         /* For TLS, cert_req is set to 2, so a cert chain
 341                          * of nothing is sent, but no verify packet is sent */
 342                         if (s->s3->tmp.cert_req == 1)
 343                                 {
 344                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 345                                 }
 346                         else
 347                                 {
 348                                 s->state=SSL3_ST_CW_CHANGE_A;
 349                                 s->s3->change_cipher_spec=0;
 350                                 }
 351
 352                         s->init_num=0;
 353                         break;
 354
 355                 case SSL3_ST_CW_CERT_VRFY_A:
 356                 case SSL3_ST_CW_CERT_VRFY_B:
 357                         ret=dtls1_send_client_verify(s);
 358                         if (ret <= 0) goto end;
 359                         s->state=SSL3_ST_CW_CHANGE_A;
 360                         s->init_num=0;
 361                         s->s3->change_cipher_spec=0;
 362                         break;
 363
 364                 case SSL3_ST_CW_CHANGE_A:
 365                 case SSL3_ST_CW_CHANGE_B:
 366                         ret=dtls1_send_change_cipher_spec(s,
 367                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 368                         if (ret <= 0) goto end;
 369                         s->state=SSL3_ST_CW_FINISHED_A;
 370                         s->init_num=0;
 371
 372                         s->session->cipher=s->s3->tmp.new_cipher;
 373 #ifdef OPENSSL_NO_COMP
 374                         s->session->compress_meth=0;
 375 #else
 376                         if (s->s3->tmp.new_compression == NULL)
 377                                 s->session->compress_meth=0;
 378                         else
 379                                 s->session->compress_meth=
 380                                         s->s3->tmp.new_compression->id;
 381 #endif
 382                         if (!s->method->ssl3_enc->setup_key_block(s))
 383                                 {
 384                                 ret= -1;
 385                                 goto end;
 386                                 }
 387
 388                         if (!s->method->ssl3_enc->change_cipher_state(s,
 389                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 390                                 {
 391                                 ret= -1;
 392                                 goto end;
 393                                 }
 394
 395                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 396                         break;
 397
 398                 case SSL3_ST_CW_FINISHED_A:
 399                 case SSL3_ST_CW_FINISHED_B:
 400                         ret=dtls1_send_finished(s,
 401                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 402                                 s->method->ssl3_enc->client_finished_label,
 403                                 s->method->ssl3_enc->client_finished_label_len);
 404                         if (ret <= 0) goto end;
 405                         s->state=SSL3_ST_CW_FLUSH;
 406
 407                         /* clear flags */
 408                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 409                         if (s->hit)
 410                                 {
 411                                 s->s3->tmp.next_state=SSL_ST_OK;
 412                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 413                                         {
 414                                         s->state=SSL_ST_OK;
 415                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 416                                         s->s3->delay_buf_pop_ret=0;
 417                                         }
 418                                 }
 419                         else
 420                                 {
 421                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 422                                 }
 423                         s->init_num=0;
 424                         break;
 425
 426                 case SSL3_ST_CR_FINISHED_A:
 427                 case SSL3_ST_CR_FINISHED_B:
 428
 429                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 430                                 SSL3_ST_CR_FINISHED_B);
 431                         if (ret <= 0) goto end;
 432
 433                         if (s->hit)
 434                                 s->state=SSL3_ST_CW_CHANGE_A;
 435                         else
 436                                 s->state=SSL_ST_OK;
 437                         s->init_num=0;
 438                         break;
 439
 440                 case SSL3_ST_CW_FLUSH:
 441                         /* number of bytes to be flushed */
 442                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 443                         if (num1 > 0)
 444                                 {
 445                                 s->rwstate=SSL_WRITING;
 446                                 num1=BIO_flush(s->wbio);
 447                                 if (num1 <= 0) { ret= -1; goto end; }
 448                                 s->rwstate=SSL_NOTHING;
 449                                 }
 450
 451                         s->state=s->s3->tmp.next_state;
 452                         break;
 453
 454                 case SSL_ST_OK:
 455                         /* clean a few things up */
 456                         ssl3_cleanup_key_block(s);
 457
 458 #if 0
 459                         if (s->init_buf != NULL)
 460                                 {
 461                                 BUF_MEM_free(s->init_buf);
 462                                 s->init_buf=NULL;
 463                                 }
 464 #endif
 465
 466                         /* If we are not 'joining' the last two packets,
 467                          * remove the buffering now */
 468                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 469                                 ssl_free_wbio_buffer(s);
 470                         /* else do it later in ssl3_write */
 471
 472                         s->init_num=0;
 473                         s->new_session=0;
 474
 475                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 476                         if (s->hit) s->ctx->stats.sess_hit++;
 477
 478                         ret=1;
 479                         /* s->server=0; */
 480                         s->handshake_func=dtls1_connect;
 481                         s->ctx->stats.sess_connect_good++;
 482
 483                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 484
 485                         /* done with handshaking */
 486                         s->d1->handshake_read_seq  = 0;
 487                         goto end;
 488                         /* break; */
 489
 490                 default:
 491                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 492                         ret= -1;
 493                         goto end;
 494                         /* break; */
 495                         }
 496
 497                 /* did we do anything */
 498                 if (!s->s3->tmp.reuse_message && !skip)
 499                         {
 500                         if (s->debug)
 501                                 {
 502                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 503                                         goto end;
 504                                 }
 505
 506                         if ((cb != NULL) && (s->state != state))
 507                                 {
 508                                 new_state=s->state;
 509                                 s->state=state;
 510                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 511                                 s->state=new_state;
 512                                 }
 513                         }
 514                 skip=0;
 515                 }
 516 end:
 517         s->in_handshake--;
 518         if (buf != NULL)
 519                 BUF_MEM_free(buf);
 520         if (cb != NULL)
 521                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 522         return(ret);
 523         }
 524
 525 int dtls1_client_hello(SSL *s)
 526         {
 527         unsigned char *buf;
 528         unsigned char *p,*d;
 529         unsigned int i,j;
 530         unsigned long Time,l;
 531         SSL_COMP *comp;
 532
 533         buf=(unsigned char *)s->init_buf->data;
 534         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 535                 {
 536                 if ((s->session == NULL) ||
 537                         (s->session->ssl_version != s->version) ||
 538                         (s->session->not_resumable))
 539                         {
 540                         if (!ssl_get_new_session(s,0))
 541                                 goto err;
 542                         }
 543                 /* else use the pre-loaded session */
 544
 545                 p=s->s3->client_random;
 546                 Time=(unsigned long)time(NULL);                 /* Time */
 547                 l2n(Time,p);
 548                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 549
 550                 /* Do the message type and length last */
 551                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 552
 553                 *(p++)=s->version>>8;
 554                 *(p++)=s->version&0xff;
 555                 s->client_version=s->version;
 556
 557                 /* Random stuff */
 558                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 559                 p+=SSL3_RANDOM_SIZE;
 560
 561                 /* Session ID */
 562                 if (s->new_session)
 563                         i=0;
 564                 else
 565                         i=s->session->session_id_length;
 566                 *(p++)=i;
 567                 if (i != 0)
 568                         {
 569                         if (i > sizeof s->session->session_id)
 570                                 {
 571                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 572                                 goto err;
 573                                 }
 574                         memcpy(p,s->session->session_id,i);
 575                         p+=i;
 576                         }
 577
 578                 /* cookie stuff */
 579                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 580                         {
 581                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 582                         goto err;
 583                         }
 584                 *(p++) = s->d1->cookie_len;
 585                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 586                 p += s->d1->cookie_len;
 587
 588                 /* Ciphers supported */
 589                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 590                 if (i == 0)
 591                         {
 592                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 593                         goto err;
 594                         }
 595                 s2n(i,p);
 596                 p+=i;
 597
 598                 /* COMPRESSION */
 599                 if (s->ctx->comp_methods == NULL)
 600                         j=0;
 601                 else
 602                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 603                 *(p++)=1+j;
 604                 for (i=0; i<j; i++)
 605                         {
 606                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 607                         *(p++)=comp->id;
 608                         }
 609                 *(p++)=0; /* Add the NULL method */
 610
 611                 l=(p-d);
 612                 d=buf;
 613
 614                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 615
 616                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 617                 /* number of bytes to write */
 618                 s->init_num=p-buf;
 619                 s->init_off=0;
 620
 621                 /* buffer the message to handle re-xmits */
 622                 dtls1_buffer_message(s, 0);
 623                 }
 624
 625         /* SSL3_ST_CW_CLNT_HELLO_B */
 626         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 627 err:
 628         return(-1);
 629         }
 630
 631 static int dtls1_get_hello_verify(SSL *s)
 632         {
 633         int n, al, ok = 0;
 634         unsigned char *data;
 635         unsigned int cookie_len;
 636
 637         n=s->method->ssl_get_message(s,
 638                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 639                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 640                 -1,
 641                 s->max_cert_list,
 642                 &ok);
 643
 644         if (!ok) return((int)n);
 645
 646         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 647                 {
 648                 s->d1->send_cookie = 0;
 649                 s->s3->tmp.reuse_message=1;
 650                 return(1);
 651                 }
 652
 653         data = (unsigned char *)s->init_msg;
 654
 655         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 656                 {
 657                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 658                 s->version=(s->version&0xff00)|data[1];
 659                 al = SSL_AD_PROTOCOL_VERSION;
 660                 goto f_err;
 661                 }
 662         data+=2;
 663
 664         cookie_len = *(data++);
 665         if ( cookie_len > sizeof(s->d1->cookie))
 666                 {
 667                 al=SSL_AD_ILLEGAL_PARAMETER;
 668                 goto f_err;
 669                 }
 670
 671         memcpy(s->d1->cookie, data, cookie_len);
 672         s->d1->cookie_len = cookie_len;
 673
 674         s->d1->send_cookie = 1;
 675         return 1;
 676
 677 f_err:
 678         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 679         return -1;
 680         }
 681
 682 int dtls1_send_client_key_exchange(SSL *s)
 683         {
 684         unsigned char *p,*d;
 685         int n;
 686         unsigned long alg_k;
 687 #ifndef OPENSSL_NO_RSA
 688         unsigned char *q;
 689         EVP_PKEY *pkey=NULL;
 690 #endif
 691 #ifndef OPENSSL_NO_KRB5
 692         KSSL_ERR kssl_err;
 693 #endif /* OPENSSL_NO_KRB5 */
 694
 695         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
 696                 {
 697                 d=(unsigned char *)s->init_buf->data;
 698                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 699
 700                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
 701
 702                 /* Fool emacs indentation */
 703                 if (0) {}
 704 #ifndef OPENSSL_NO_RSA
 705                 else if (alg_k & SSL_kRSA)
 706                         {
 707                         RSA *rsa;
 708                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 709
 710                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
 711                                 rsa=s->session->sess_cert->peer_rsa_tmp;
 712                         else
 713                                 {
 714                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 715                                 if ((pkey == NULL) ||
 716                                         (pkey->type != EVP_PKEY_RSA) ||
 717                                         (pkey->pkey.rsa == NULL))
 718                                         {
 719                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 720                                         goto err;
 721                                         }
 722                                 rsa=pkey->pkey.rsa;
 723                                 EVP_PKEY_free(pkey);
 724                                 }
 725
 726                         tmp_buf[0]=s->client_version>>8;
 727                         tmp_buf[1]=s->client_version&0xff;
 728                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
 729                                         goto err;
 730
 731                         s->session->master_key_length=sizeof tmp_buf;
 732
 733                         q=p;
 734                         /* Fix buf for TLS and beyond */
 735                         if (s->version > SSL3_VERSION)
 736                                 p+=2;
 737                         n=RSA_public_encrypt(sizeof tmp_buf,
 738                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
 739 #ifdef PKCS1_CHECK
 740                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
 741                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
 742 #endif
 743                         if (n <= 0)
 744                                 {
 745                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
 746                                 goto err;
 747                                 }
 748
 749                         /* Fix buf for TLS and beyond */
 750                         if (s->version > SSL3_VERSION)
 751                                 {
 752                                 s2n(n,q);
 753                                 n+=2;
 754                                 }
 755
 756                         s->session->master_key_length=
 757                                 s->method->ssl3_enc->generate_master_secret(s,
 758                                         s->session->master_key,
 759                                         tmp_buf,sizeof tmp_buf);
 760                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
 761                         }
 762 #endif
 763 #ifndef OPENSSL_NO_KRB5
 764                 else if (alg_k & SSL_kKRB5)
 765                         {
 766                         krb5_error_code krb5rc;
 767                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
 768                         /*  krb5_data   krb5_ap_req;  */
 769                         krb5_data       *enc_ticket;
 770                         krb5_data       authenticator, *authp = NULL;
 771                         EVP_CIPHER_CTX  ciph_ctx;
 772                         EVP_CIPHER      *enc = NULL;
 773                         unsigned char   iv[EVP_MAX_IV_LENGTH];
 774                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 775                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
 776                                                 + EVP_MAX_IV_LENGTH];
 777                         int             padl, outl = sizeof(epms);
 778
 779                         EVP_CIPHER_CTX_init(&ciph_ctx);
 780
 781 #ifdef KSSL_DEBUG
 782                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
 783                                 alg_k, SSL_kKRB5);
 784 #endif  /* KSSL_DEBUG */
 785
 786                         authp = NULL;
 787 #ifdef KRB5SENDAUTH
 788                         if (KRB5SENDAUTH)  authp = &authenticator;
 789 #endif  /* KRB5SENDAUTH */
 790
 791                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
 792                                 &kssl_err);
 793                         enc = kssl_map_enc(kssl_ctx->enctype);
 794                         if (enc == NULL)
 795                             goto err;
 796 #ifdef KSSL_DEBUG
 797                         {
 798                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
 799                         if (krb5rc && kssl_err.text)
 800                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
 801                         }
 802 #endif  /* KSSL_DEBUG */
 803
 804                         if (krb5rc)
 805                                 {
 806                                 ssl3_send_alert(s,SSL3_AL_FATAL,
 807                                                 SSL_AD_HANDSHAKE_FAILURE);
 808                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 809                                                 kssl_err.reason);
 810                                 goto err;
 811                                 }
 812
 813                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
 814                         **  in place of RFC 2712 KerberosWrapper, as in:
 815                         **
 816                         **  Send ticket (copy to *p, set n = length)
 817                         **  n = krb5_ap_req.length;
 818                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
 819                         **  if (krb5_ap_req.data)
 820                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
 821                         **
 822                         **  Now using real RFC 2712 KerberosWrapper
 823                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
 824                         **  Note: 2712 "opaque" types are here replaced
 825                         **  with a 2-byte length followed by the value.
 826                         **  Example:
 827                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
 828                         **  Where "xx xx" = length bytes.  Shown here with
 829                         **  optional authenticator omitted.
 830                         */
 831
 832                         /*  KerberosWrapper.Ticket              */
 833                         s2n(enc_ticket->length,p);
 834                         memcpy(p, enc_ticket->data, enc_ticket->length);
 835                         p+= enc_ticket->length;
 836                         n = enc_ticket->length + 2;
 837
 838                         /*  KerberosWrapper.Authenticator       */
 839                         if (authp  &&  authp->length)
 840                                 {
 841                                 s2n(authp->length,p);
 842                                 memcpy(p, authp->data, authp->length);
 843                                 p+= authp->length;
 844                                 n+= authp->length + 2;
 845
 846                                 free(authp->data);
 847                                 authp->data = NULL;
 848                                 authp->length = 0;
 849                                 }
 850                         else
 851                                 {
 852                                 s2n(0,p);/*  null authenticator length  */
 853                                 n+=2;
 854                                 }
 855
 856                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
 857                             goto err;
 858
 859                         /*  20010420 VRS.  Tried it this way; failed.
 860                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
 861                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
 862                         **                              kssl_ctx->length);
 863                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
 864                         */
 865
 866                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
 867                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
 868                                 kssl_ctx->key,iv);
 869                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
 870                                 sizeof tmp_buf);
 871                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
 872                         outl += padl;
 873                         if (outl > sizeof epms)
 874                                 {
 875                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 876                                 goto err;
 877                                 }
 878                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
 879
 880                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
 881                         s2n(outl,p);
 882                         memcpy(p, epms, outl);
 883                         p+=outl;
 884                         n+=outl + 2;
 885
 886                         s->session->master_key_length=
 887                                 s->method->ssl3_enc->generate_master_secret(s,
 888                                         s->session->master_key,
 889                                         tmp_buf, sizeof tmp_buf);
 890
 891                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
 892                         OPENSSL_cleanse(epms, outl);
 893                         }
 894 #endif
 895 #ifndef OPENSSL_NO_DH
 896                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 897                         {
 898                         DH *dh_srvr,*dh_clnt;
 899
 900                         if (s->session->sess_cert->peer_dh_tmp != NULL)
 901                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
 902                         else
 903                                 {
 904                                 /* we get them from the cert */
 905                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 906                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
 907                                 goto err;
 908                                 }
 909
 910                         /* generate a new random key */
 911                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
 912                                 {
 913                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 914                                 goto err;
 915                                 }
 916                         if (!DH_generate_key(dh_clnt))
 917                                 {
 918                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 919                                 goto err;
 920                                 }
 921
 922                         /* use the 'p' output buffer for the DH key, but
 923                          * make sure to clear it out afterwards */
 924
 925                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
 926
 927                         if (n <= 0)
 928                                 {
 929                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 930                                 goto err;
 931                                 }
 932
 933                         /* generate master key from the result */
 934                         s->session->master_key_length=
 935                                 s->method->ssl3_enc->generate_master_secret(s,
 936                                         s->session->master_key,p,n);
 937                         /* clean up */
 938                         memset(p,0,n);
 939
 940                         /* send off the data */
 941                         n=BN_num_bytes(dh_clnt->pub_key);
 942                         s2n(n,p);
 943                         BN_bn2bin(dh_clnt->pub_key,p);
 944                         n+=2;
 945
 946                         DH_free(dh_clnt);
 947
 948                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
 949                         }
 950 #endif
 951                 else
 952                         {
 953                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 954                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 955                         goto err;
 956                         }
 957
 958                 d = dtls1_set_message_header(s, d,
 959                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
 960                 /*
 961                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
 962                  l2n3(n,d);
 963                  l2n(s->d1->handshake_write_seq,d);
 964                  s->d1->handshake_write_seq++;
 965                 */
 966
 967                 s->state=SSL3_ST_CW_KEY_EXCH_B;
 968                 /* number of bytes to write */
 969                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
 970                 s->init_off=0;
 971
 972                 /* buffer the message to handle re-xmits */
 973                 dtls1_buffer_message(s, 0);
 974                 }
 975
 976         /* SSL3_ST_CW_KEY_EXCH_B */
 977         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 978 err:
 979         return(-1);
 980         }
 981
 982 int dtls1_send_client_verify(SSL *s)
 983         {
 984         unsigned char *p,*d;
 985         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 986         EVP_PKEY *pkey;
 987 #ifndef OPENSSL_NO_RSA
 988         unsigned u=0;
 989 #endif
 990         unsigned long n;
 991 #ifndef OPENSSL_NO_DSA
 992         int j;
 993 #endif
 994
 995         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
 996                 {
 997                 d=(unsigned char *)s->init_buf->data;
 998                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 999                 pkey=s->cert->key->privatekey;
1000
1001                 s->method->ssl3_enc->cert_verify_mac(s,
1002                 NID_sha1,
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                                 NID_md5,
1010                                 &(data[0]));
1011                         if (RSA_sign(NID_md5_sha1, data,
1012                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1013                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1014                                 {
1015                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1016                                 goto err;
1017                                 }
1018                         s2n(u,p);
1019                         n=u+2;
1020                         }
1021                 else
1022 #endif
1023 #ifndef OPENSSL_NO_DSA
1024                         if (pkey->type == EVP_PKEY_DSA)
1025                         {
1026                         if (!DSA_sign(pkey->save_type,
1027                                 &(data[MD5_DIGEST_LENGTH]),
1028                                 SHA_DIGEST_LENGTH,&(p[2]),
1029                                 (unsigned int *)&j,pkey->pkey.dsa))
1030                                 {
1031                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1032                                 goto err;
1033                                 }
1034                         s2n(j,p);
1035                         n=j+2;
1036                         }
1037                 else
1038 #endif
1039                         {
1040                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1041                         goto err;
1042                         }
1043
1044                 d = dtls1_set_message_header(s, d,
1045                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1046
1047                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1048                 s->init_off=0;
1049
1050                 /* buffer the message to handle re-xmits */
1051                 dtls1_buffer_message(s, 0);
1052
1053                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1054                 }
1055
1056         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1057         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1058 err:
1059         return(-1);
1060         }
1061
1062 int dtls1_send_client_certificate(SSL *s)
1063         {
1064         X509 *x509=NULL;
1065         EVP_PKEY *pkey=NULL;
1066         int i;
1067         unsigned long l;
1068
1069         if (s->state == SSL3_ST_CW_CERT_A)
1070                 {
1071                 if ((s->cert == NULL) ||
1072                         (s->cert->key->x509 == NULL) ||
1073                         (s->cert->key->privatekey == NULL))
1074                         s->state=SSL3_ST_CW_CERT_B;
1075                 else
1076                         s->state=SSL3_ST_CW_CERT_C;
1077                 }
1078
1079         /* We need to get a client cert */
1080         if (s->state == SSL3_ST_CW_CERT_B)
1081                 {
1082                 /* If we get an error, we need to
1083                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1084                  * We then get retied later */
1085                 i=0;
1086                 if (s->ctx->client_cert_cb != NULL)
1087                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1088                 if (i < 0)
1089                         {
1090                         s->rwstate=SSL_X509_LOOKUP;
1091                         return(-1);
1092                         }
1093                 s->rwstate=SSL_NOTHING;
1094                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1095                         {
1096                         s->state=SSL3_ST_CW_CERT_B;
1097                         if (    !SSL_use_certificate(s,x509) ||
1098                                 !SSL_use_PrivateKey(s,pkey))
1099                                 i=0;
1100                         }
1101                 else if (i == 1)
1102                         {
1103                         i=0;
1104                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1105                         }
1106
1107                 if (x509 != NULL) X509_free(x509);
1108                 if (pkey != NULL) EVP_PKEY_free(pkey);
1109                 if (i == 0)
1110                         {
1111                         if (s->version == SSL3_VERSION)
1112                                 {
1113                                 s->s3->tmp.cert_req=0;
1114                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1115                                 return(1);
1116                                 }
1117                         else
1118                                 {
1119                                 s->s3->tmp.cert_req=2;
1120                                 }
1121                         }
1122
1123                 /* Ok, we have a cert */
1124                 s->state=SSL3_ST_CW_CERT_C;
1125                 }
1126
1127         if (s->state == SSL3_ST_CW_CERT_C)
1128                 {
1129                 s->state=SSL3_ST_CW_CERT_D;
1130                 l=dtls1_output_cert_chain(s,
1131                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1132                 s->init_num=(int)l;
1133                 s->init_off=0;
1134
1135                 /* set header called by dtls1_output_cert_chain() */
1136
1137                 /* buffer the message to handle re-xmits */
1138                 dtls1_buffer_message(s, 0);
1139                 }
1140         /* SSL3_ST_CW_CERT_D */
1141         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1142         }
1143
1144