ssl/d1_clnt.c

   1 /* ssl/d1_clnt.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2005 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #include <openssl/buffer.h>
 119 #include <openssl/rand.h>
 120 #include <openssl/objects.h>
 121 #include <openssl/evp.h>
 122 #include <openssl/md5.h>
 123 #include <openssl/bn.h>
 124 #ifndef OPENSSL_NO_DH
 125 #include <openssl/dh.h>
 126 #endif
 127
 128 static SSL_METHOD *dtls1_get_client_method(int ver);
 129 static int dtls1_get_hello_verify(SSL *s);
 130
 131 static SSL_METHOD *dtls1_get_client_method(int ver)
 132         {
 133         if (ver == DTLS1_VERSION)
 134                 return(DTLSv1_client_method());
 135         else
 136                 return(NULL);
 137         }
 138
 139 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=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                         if (s->s3->tmp.new_compression == NULL)
 375                                 s->session->compress_meth=0;
 376                         else
 377                                 s->session->compress_meth=
 378                                         s->s3->tmp.new_compression->id;
 379                         if (!s->method->ssl3_enc->setup_key_block(s))
 380                                 {
 381                                 ret= -1;
 382                                 goto end;
 383                                 }
 384
 385                         if (!s->method->ssl3_enc->change_cipher_state(s,
 386                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 387                                 {
 388                                 ret= -1;
 389                                 goto end;
 390                                 }
 391
 392                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 393                         break;
 394
 395                 case SSL3_ST_CW_FINISHED_A:
 396                 case SSL3_ST_CW_FINISHED_B:
 397                         ret=dtls1_send_finished(s,
 398                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 399                                 s->method->ssl3_enc->client_finished_label,
 400                                 s->method->ssl3_enc->client_finished_label_len);
 401                         if (ret <= 0) goto end;
 402                         s->state=SSL3_ST_CW_FLUSH;
 403
 404                         /* clear flags */
 405                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 406                         if (s->hit)
 407                                 {
 408                                 s->s3->tmp.next_state=SSL_ST_OK;
 409                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 410                                         {
 411                                         s->state=SSL_ST_OK;
 412                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 413                                         s->s3->delay_buf_pop_ret=0;
 414                                         }
 415                                 }
 416                         else
 417                                 {
 418                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 419                                 }
 420                         s->init_num=0;
 421                         break;
 422
 423                 case SSL3_ST_CR_FINISHED_A:
 424                 case SSL3_ST_CR_FINISHED_B:
 425
 426                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 427                                 SSL3_ST_CR_FINISHED_B);
 428                         if (ret <= 0) goto end;
 429
 430                         if (s->hit)
 431                                 s->state=SSL3_ST_CW_CHANGE_A;
 432                         else
 433                                 s->state=SSL_ST_OK;
 434                         s->init_num=0;
 435                         break;
 436
 437                 case SSL3_ST_CW_FLUSH:
 438                         /* number of bytes to be flushed */
 439                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 440                         if (num1 > 0)
 441                                 {
 442                                 s->rwstate=SSL_WRITING;
 443                                 num1=BIO_flush(s->wbio);
 444                                 if (num1 <= 0) { ret= -1; goto end; }
 445                                 s->rwstate=SSL_NOTHING;
 446                                 }
 447
 448                         s->state=s->s3->tmp.next_state;
 449                         break;
 450
 451                 case SSL_ST_OK:
 452                         /* clean a few things up */
 453                         ssl3_cleanup_key_block(s);
 454
 455 #if 0
 456                         if (s->init_buf != NULL)
 457                                 {
 458                                 BUF_MEM_free(s->init_buf);
 459                                 s->init_buf=NULL;
 460                                 }
 461 #endif
 462
 463                         /* If we are not 'joining' the last two packets,
 464                          * remove the buffering now */
 465                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 466                                 ssl_free_wbio_buffer(s);
 467                         /* else do it later in ssl3_write */
 468
 469                         s->init_num=0;
 470                         s->new_session=0;
 471
 472                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 473                         if (s->hit) s->ctx->stats.sess_hit++;
 474
 475                         ret=1;
 476                         /* s->server=0; */
 477                         s->handshake_func=dtls1_connect;
 478                         s->ctx->stats.sess_connect_good++;
 479
 480                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 481
 482                         /* done with handshaking */
 483                         s->d1->handshake_read_seq  = 0;
 484                         goto end;
 485                         /* break; */
 486
 487                 default:
 488                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 489                         ret= -1;
 490                         goto end;
 491                         /* break; */
 492                         }
 493
 494                 /* did we do anything */
 495                 if (!s->s3->tmp.reuse_message && !skip)
 496                         {
 497                         if (s->debug)
 498                                 {
 499                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 500                                         goto end;
 501                                 }
 502
 503                         if ((cb != NULL) && (s->state != state))
 504                                 {
 505                                 new_state=s->state;
 506                                 s->state=state;
 507                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 508                                 s->state=new_state;
 509                                 }
 510                         }
 511                 skip=0;
 512                 }
 513 end:
 514         s->in_handshake--;
 515         if (buf != NULL)
 516                 BUF_MEM_free(buf);
 517         if (cb != NULL)
 518                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 519         return(ret);
 520         }
 521
 522 int dtls1_client_hello(SSL *s)
 523         {
 524         unsigned char *buf;
 525         unsigned char *p,*d;
 526         unsigned int i,j;
 527         unsigned long Time,l;
 528         SSL_COMP *comp;
 529
 530         buf=(unsigned char *)s->init_buf->data;
 531         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 532                 {
 533                 if ((s->session == NULL) ||
 534                         (s->session->ssl_version != s->version) ||
 535                         (s->session->not_resumable))
 536                         {
 537                         if (!ssl_get_new_session(s,0))
 538                                 goto err;
 539                         }
 540                 /* else use the pre-loaded session */
 541
 542                 p=s->s3->client_random;
 543                 Time=time(NULL);                        /* Time */
 544                 l2n(Time,p);
 545                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 546
 547                 /* Do the message type and length last */
 548                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 549
 550                 *(p++)=s->version>>8;
 551                 *(p++)=s->version&0xff;
 552                 s->client_version=s->version;
 553
 554                 /* Random stuff */
 555                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 556                 p+=SSL3_RANDOM_SIZE;
 557
 558                 /* Session ID */
 559                 if (s->new_session)
 560                         i=0;
 561                 else
 562                         i=s->session->session_id_length;
 563                 *(p++)=i;
 564                 if (i != 0)
 565                         {
 566                         if (i > sizeof s->session->session_id)
 567                                 {
 568                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 569                                 goto err;
 570                                 }
 571                         memcpy(p,s->session->session_id,i);
 572                         p+=i;
 573                         }
 574
 575                 /* cookie stuff */
 576                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 577                         {
 578                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 579                         goto err;
 580                         }
 581                 *(p++) = s->d1->cookie_len;
 582                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 583                 p += s->d1->cookie_len;
 584
 585                 /* Ciphers supported */
 586                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 587                 if (i == 0)
 588                         {
 589                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 590                         goto err;
 591                         }
 592                 s2n(i,p);
 593                 p+=i;
 594
 595                 /* COMPRESSION */
 596                 if (s->ctx->comp_methods == NULL)
 597                         j=0;
 598                 else
 599                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 600                 *(p++)=1+j;
 601                 for (i=0; i<j; i++)
 602                         {
 603                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 604                         *(p++)=comp->id;
 605                         }
 606                 *(p++)=0; /* Add the NULL method */
 607
 608                 l=(p-d);
 609                 d=buf;
 610
 611                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 612
 613                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 614                 /* number of bytes to write */
 615                 s->init_num=p-buf;
 616                 s->init_off=0;
 617
 618                 /* buffer the message to handle re-xmits */
 619                 dtls1_buffer_message(s, 0);
 620                 }
 621
 622         /* SSL3_ST_CW_CLNT_HELLO_B */
 623         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 624 err:
 625         return(-1);
 626         }
 627
 628 static int dtls1_get_hello_verify(SSL *s)
 629         {
 630         int n, al, ok = 0;
 631         unsigned char *data;
 632         unsigned int cookie_len;
 633
 634         n=s->method->ssl_get_message(s,
 635                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 636                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 637                 -1,
 638                 s->max_cert_list,
 639                 &ok);
 640
 641         if (!ok) return((int)n);
 642
 643         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 644                 {
 645                 s->d1->send_cookie = 0;
 646                 s->s3->tmp.reuse_message=1;
 647                 return(1);
 648                 }
 649
 650         data = (unsigned char *)s->init_msg;
 651
 652         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 653                 {
 654                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 655                 s->version=(s->version&0xff00)|data[1];
 656                 al = SSL_AD_PROTOCOL_VERSION;
 657                 goto f_err;
 658                 }
 659         data+=2;
 660
 661         cookie_len = *(data++);
 662         if ( cookie_len > sizeof(s->d1->cookie))
 663                 {
 664                 al=SSL_AD_ILLEGAL_PARAMETER;
 665                 goto f_err;
 666                 }
 667
 668         memcpy(s->d1->cookie, data, cookie_len);
 669         s->d1->cookie_len = cookie_len;
 670
 671         s->d1->send_cookie = 1;
 672         return 1;
 673
 674 f_err:
 675         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 676         return -1;
 677         }
 678
 679 int dtls1_send_client_key_exchange(SSL *s)
 680         {
 681         unsigned char *p,*d;
 682         int n;
 683         unsigned long l;
 684 #ifndef OPENSSL_NO_RSA
 685         unsigned char *q;
 686         EVP_PKEY *pkey=NULL;
 687 #endif
 688 #ifndef OPENSSL_NO_KRB5
 689         KSSL_ERR kssl_err;
 690 #endif /* OPENSSL_NO_KRB5 */
 691
 692         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
 693                 {
 694                 d=(unsigned char *)s->init_buf->data;
 695                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 696
 697                 l=s->s3->tmp.new_cipher->algorithms;
 698
 699                 /* Fool emacs indentation */
 700                 if (0) {}
 701 #ifndef OPENSSL_NO_RSA
 702                 else if (l & SSL_kRSA)
 703                         {
 704                         RSA *rsa;
 705                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 706
 707                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
 708                                 rsa=s->session->sess_cert->peer_rsa_tmp;
 709                         else
 710                                 {
 711                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 712                                 if ((pkey == NULL) ||
 713                                         (pkey->type != EVP_PKEY_RSA) ||
 714                                         (pkey->pkey.rsa == NULL))
 715                                         {
 716                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 717                                         goto err;
 718                                         }
 719                                 rsa=pkey->pkey.rsa;
 720                                 EVP_PKEY_free(pkey);
 721                                 }
 722
 723                         tmp_buf[0]=s->client_version>>8;
 724                         tmp_buf[1]=s->client_version&0xff;
 725                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
 726                                         goto err;
 727
 728                         s->session->master_key_length=sizeof tmp_buf;
 729
 730                         q=p;
 731                         /* Fix buf for TLS and beyond */
 732                         if (s->version > SSL3_VERSION)
 733                                 p+=2;
 734                         n=RSA_public_encrypt(sizeof tmp_buf,
 735                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
 736 #ifdef PKCS1_CHECK
 737                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
 738                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
 739 #endif
 740                         if (n <= 0)
 741                                 {
 742                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
 743                                 goto err;
 744                                 }
 745
 746                         /* Fix buf for TLS and beyond */
 747                         if (s->version > SSL3_VERSION)
 748                                 {
 749                                 s2n(n,q);
 750                                 n+=2;
 751                                 }
 752
 753                         s->session->master_key_length=
 754                                 s->method->ssl3_enc->generate_master_secret(s,
 755                                         s->session->master_key,
 756                                         tmp_buf,sizeof tmp_buf);
 757                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
 758                         }
 759 #endif
 760 #ifndef OPENSSL_NO_KRB5
 761                 else if (l & SSL_kKRB5)
 762                         {
 763                         krb5_error_code krb5rc;
 764                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
 765                         /*  krb5_data   krb5_ap_req;  */
 766                         krb5_data       *enc_ticket;
 767                         krb5_data       authenticator, *authp = NULL;
 768                         EVP_CIPHER_CTX  ciph_ctx;
 769                         EVP_CIPHER      *enc = NULL;
 770                         unsigned char   iv[EVP_MAX_IV_LENGTH];
 771                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 772                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
 773                                                 + EVP_MAX_IV_LENGTH];
 774                         int             padl, outl = sizeof(epms);
 775
 776                         EVP_CIPHER_CTX_init(&ciph_ctx);
 777
 778 #ifdef KSSL_DEBUG
 779                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
 780                                 l, SSL_kKRB5);
 781 #endif  /* KSSL_DEBUG */
 782
 783                         authp = NULL;
 784 #ifdef KRB5SENDAUTH
 785                         if (KRB5SENDAUTH)  authp = &authenticator;
 786 #endif  /* KRB5SENDAUTH */
 787
 788                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
 789                                 &kssl_err);
 790                         enc = kssl_map_enc(kssl_ctx->enctype);
 791                         if (enc == NULL)
 792                             goto err;
 793 #ifdef KSSL_DEBUG
 794                         {
 795                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
 796                         if (krb5rc && kssl_err.text)
 797                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
 798                         }
 799 #endif  /* KSSL_DEBUG */
 800
 801                         if (krb5rc)
 802                                 {
 803                                 ssl3_send_alert(s,SSL3_AL_FATAL,
 804                                                 SSL_AD_HANDSHAKE_FAILURE);
 805                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 806                                                 kssl_err.reason);
 807                                 goto err;
 808                                 }
 809
 810                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
 811                         **  in place of RFC 2712 KerberosWrapper, as in:
 812                         **
 813                         **  Send ticket (copy to *p, set n = length)
 814                         **  n = krb5_ap_req.length;
 815                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
 816                         **  if (krb5_ap_req.data)
 817                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
 818                         **
 819                         **  Now using real RFC 2712 KerberosWrapper
 820                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
 821                         **  Note: 2712 "opaque" types are here replaced
 822                         **  with a 2-byte length followed by the value.
 823                         **  Example:
 824                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
 825                         **  Where "xx xx" = length bytes.  Shown here with
 826                         **  optional authenticator omitted.
 827                         */
 828
 829                         /*  KerberosWrapper.Ticket              */
 830                         s2n(enc_ticket->length,p);
 831                         memcpy(p, enc_ticket->data, enc_ticket->length);
 832                         p+= enc_ticket->length;
 833                         n = enc_ticket->length + 2;
 834
 835                         /*  KerberosWrapper.Authenticator       */
 836                         if (authp  &&  authp->length)
 837                                 {
 838                                 s2n(authp->length,p);
 839                                 memcpy(p, authp->data, authp->length);
 840                                 p+= authp->length;
 841                                 n+= authp->length + 2;
 842
 843                                 free(authp->data);
 844                                 authp->data = NULL;
 845                                 authp->length = 0;
 846                                 }
 847                         else
 848                                 {
 849                                 s2n(0,p);/*  null authenticator length  */
 850                                 n+=2;
 851                                 }
 852
 853                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
 854                             goto err;
 855
 856                         /*  20010420 VRS.  Tried it this way; failed.
 857                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
 858                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
 859                         **                              kssl_ctx->length);
 860                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
 861                         */
 862
 863                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
 864                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
 865                                 kssl_ctx->key,iv);
 866                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
 867                                 sizeof tmp_buf);
 868                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
 869                         outl += padl;
 870                         if (outl > sizeof epms)
 871                                 {
 872                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 873                                 goto err;
 874                                 }
 875                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
 876
 877                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
 878                         s2n(outl,p);
 879                         memcpy(p, epms, outl);
 880                         p+=outl;
 881                         n+=outl + 2;
 882
 883                         s->session->master_key_length=
 884                                 s->method->ssl3_enc->generate_master_secret(s,
 885                                         s->session->master_key,
 886                                         tmp_buf, sizeof tmp_buf);
 887
 888                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
 889                         OPENSSL_cleanse(epms, outl);
 890                         }
 891 #endif
 892 #ifndef OPENSSL_NO_DH
 893                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 894                         {
 895                         DH *dh_srvr,*dh_clnt;
 896
 897                         if (s->session->sess_cert->peer_dh_tmp != NULL)
 898                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
 899                         else
 900                                 {
 901                                 /* we get them from the cert */
 902                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 903                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
 904                                 goto err;
 905                                 }
 906
 907                         /* generate a new random key */
 908                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
 909                                 {
 910                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 911                                 goto err;
 912                                 }
 913                         if (!DH_generate_key(dh_clnt))
 914                                 {
 915                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 916                                 goto err;
 917                                 }
 918
 919                         /* use the 'p' output buffer for the DH key, but
 920                          * make sure to clear it out afterwards */
 921
 922                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
 923
 924                         if (n <= 0)
 925                                 {
 926                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 927                                 goto err;
 928                                 }
 929
 930                         /* generate master key from the result */
 931                         s->session->master_key_length=
 932                                 s->method->ssl3_enc->generate_master_secret(s,
 933                                         s->session->master_key,p,n);
 934                         /* clean up */
 935                         memset(p,0,n);
 936
 937                         /* send off the data */
 938                         n=BN_num_bytes(dh_clnt->pub_key);
 939                         s2n(n,p);
 940                         BN_bn2bin(dh_clnt->pub_key,p);
 941                         n+=2;
 942
 943                         DH_free(dh_clnt);
 944
 945                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
 946                         }
 947 #endif
 948                 else
 949                         {
 950                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 951                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 952                         goto err;
 953                         }
 954
 955                 d = dtls1_set_message_header(s, d,
 956                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
 957                 /*
 958                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
 959                  l2n3(n,d);
 960                  l2n(s->d1->handshake_write_seq,d);
 961                  s->d1->handshake_write_seq++;
 962                 */
 963
 964                 s->state=SSL3_ST_CW_KEY_EXCH_B;
 965                 /* number of bytes to write */
 966                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
 967                 s->init_off=0;
 968
 969                 /* buffer the message to handle re-xmits */
 970                 dtls1_buffer_message(s, 0);
 971                 }
 972
 973         /* SSL3_ST_CW_KEY_EXCH_B */
 974         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 975 err:
 976         return(-1);
 977         }
 978
 979 int dtls1_send_client_verify(SSL *s)
 980         {
 981         unsigned char *p,*d;
 982         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 983         EVP_PKEY *pkey;
 984 #ifndef OPENSSL_NO_RSA
 985         unsigned u=0;
 986 #endif
 987         unsigned long n;
 988 #ifndef OPENSSL_NO_DSA
 989         int j;
 990 #endif
 991
 992         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
 993                 {
 994                 d=(unsigned char *)s->init_buf->data;
 995                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 996                 pkey=s->cert->key->privatekey;
 997
 998                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
 999                         &(data[MD5_DIGEST_LENGTH]));
1000
1001 #ifndef OPENSSL_NO_RSA
1002                 if (pkey->type == EVP_PKEY_RSA)
1003                         {
1004                         s->method->ssl3_enc->cert_verify_mac(s,
1005                                 &(s->s3->finish_dgst1),&(data[0]));
1006                         if (RSA_sign(NID_md5_sha1, data,
1007                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1008                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1009                                 {
1010                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1011                                 goto err;
1012                                 }
1013                         s2n(u,p);
1014                         n=u+2;
1015                         }
1016                 else
1017 #endif
1018 #ifndef OPENSSL_NO_DSA
1019                         if (pkey->type == EVP_PKEY_DSA)
1020                         {
1021                         if (!DSA_sign(pkey->save_type,
1022                                 &(data[MD5_DIGEST_LENGTH]),
1023                                 SHA_DIGEST_LENGTH,&(p[2]),
1024                                 (unsigned int *)&j,pkey->pkey.dsa))
1025                                 {
1026                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1027                                 goto err;
1028                                 }
1029                         s2n(j,p);
1030                         n=j+2;
1031                         }
1032                 else
1033 #endif
1034                         {
1035                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1036                         goto err;
1037                         }
1038
1039                 d = dtls1_set_message_header(s, d,
1040                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1041
1042                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1043                 s->init_off=0;
1044
1045                 /* buffer the message to handle re-xmits */
1046                 dtls1_buffer_message(s, 0);
1047
1048                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1049                 }
1050
1051         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1052         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1053 err:
1054         return(-1);
1055         }
1056
1057 int dtls1_send_client_certificate(SSL *s)
1058         {
1059         X509 *x509=NULL;
1060         EVP_PKEY *pkey=NULL;
1061         int i;
1062         unsigned long l;
1063
1064         if (s->state == SSL3_ST_CW_CERT_A)
1065                 {
1066                 if ((s->cert == NULL) ||
1067                         (s->cert->key->x509 == NULL) ||
1068                         (s->cert->key->privatekey == NULL))
1069                         s->state=SSL3_ST_CW_CERT_B;
1070                 else
1071                         s->state=SSL3_ST_CW_CERT_C;
1072                 }
1073
1074         /* We need to get a client cert */
1075         if (s->state == SSL3_ST_CW_CERT_B)
1076                 {
1077                 /* If we get an error, we need to
1078                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1079                  * We then get retied later */
1080                 i=0;
1081                 if (s->ctx->client_cert_cb != NULL)
1082                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1083                 if (i < 0)
1084                         {
1085                         s->rwstate=SSL_X509_LOOKUP;
1086                         return(-1);
1087                         }
1088                 s->rwstate=SSL_NOTHING;
1089                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1090                         {
1091                         s->state=SSL3_ST_CW_CERT_B;
1092                         if (    !SSL_use_certificate(s,x509) ||
1093                                 !SSL_use_PrivateKey(s,pkey))
1094                                 i=0;
1095                         }
1096                 else if (i == 1)
1097                         {
1098                         i=0;
1099                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1100                         }
1101
1102                 if (x509 != NULL) X509_free(x509);
1103                 if (pkey != NULL) EVP_PKEY_free(pkey);
1104                 if (i == 0)
1105                         {
1106                         if (s->version == SSL3_VERSION)
1107                                 {
1108                                 s->s3->tmp.cert_req=0;
1109                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1110                                 return(1);
1111                                 }
1112                         else
1113                                 {
1114                                 s->s3->tmp.cert_req=2;
1115                                 }
1116                         }
1117
1118                 /* Ok, we have a cert */
1119                 s->state=SSL3_ST_CW_CERT_C;
1120                 }
1121
1122         if (s->state == SSL3_ST_CW_CERT_C)
1123                 {
1124                 s->state=SSL3_ST_CW_CERT_D;
1125                 l=dtls1_output_cert_chain(s,
1126                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1127                 s->init_num=(int)l;
1128                 s->init_off=0;
1129
1130                 /* set header called by dtls1_output_cert_chain() */
1131
1132                 /* buffer the message to handle re-xmits */
1133                 dtls1_buffer_message(s, 0);
1134                 }
1135         /* SSL3_ST_CW_CERT_D */
1136         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1137         }
1138
1139