crypto/openssl-0.9/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 "kssl_lcl.h"
 119 #include <openssl/buffer.h>
 120 #include <openssl/rand.h>
 121 #include <openssl/objects.h>
 122 #include <openssl/evp.h>
 123 #include <openssl/md5.h>
 124
 125 static SSL_METHOD *dtls1_get_client_method(int ver);
 126 static int dtls1_get_hello_verify(SSL *s);
 127
 128 static SSL_METHOD *dtls1_get_client_method(int ver)
 129         {
 130         if (ver == DTLS1_VERSION)
 131                 return(DTLSv1_client_method());
 132         else
 133                 return(NULL);
 134         }
 135
 136 SSL_METHOD *DTLSv1_client_method(void)
 137         {
 138         static int init=1;
 139         static SSL_METHOD DTLSv1_client_data;
 140
 141         if (init)
 142                 {
 143                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
 144
 145                 if (init)
 146                         {
 147                         memcpy((char *)&DTLSv1_client_data,(char *)dtlsv1_base_method(),
 148                                 sizeof(SSL_METHOD));
 149                         DTLSv1_client_data.ssl_connect=dtls1_connect;
 150                         DTLSv1_client_data.get_ssl_method=dtls1_get_client_method;
 151                         init=0;
 152                         }
 153
 154                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
 155                 }
 156         return(&DTLSv1_client_data);
 157         }
 158
 159 int dtls1_connect(SSL *s)
 160         {
 161         BUF_MEM *buf=NULL;
 162         unsigned long Time=time(NULL),l;
 163         long num1;
 164         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 165         int ret= -1;
 166         int new_state,state,skip=0;;
 167
 168         RAND_add(&Time,sizeof(Time),0);
 169         ERR_clear_error();
 170         clear_sys_error();
 171
 172         if (s->info_callback != NULL)
 173                 cb=s->info_callback;
 174         else if (s->ctx->info_callback != NULL)
 175                 cb=s->ctx->info_callback;
 176
 177         s->in_handshake++;
 178         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 179
 180         for (;;)
 181                 {
 182                 state=s->state;
 183
 184                 switch(s->state)
 185                         {
 186                 case SSL_ST_RENEGOTIATE:
 187                         s->new_session=1;
 188                         s->state=SSL_ST_CONNECT;
 189                         s->ctx->stats.sess_connect_renegotiate++;
 190                         /* break */
 191                 case SSL_ST_BEFORE:
 192                 case SSL_ST_CONNECT:
 193                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 194                 case SSL_ST_OK|SSL_ST_CONNECT:
 195
 196                         s->server=0;
 197                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 198
 199                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00))
 200                                 {
 201                                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 202                                 ret = -1;
 203                                 goto end;
 204                                 }
 205
 206                         /* s->version=SSL3_VERSION; */
 207                         s->type=SSL_ST_CONNECT;
 208
 209                         if (s->init_buf == NULL)
 210                                 {
 211                                 if ((buf=BUF_MEM_new()) == NULL)
 212                                         {
 213                                         ret= -1;
 214                                         goto end;
 215                                         }
 216                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 217                                         {
 218                                         ret= -1;
 219                                         goto end;
 220                                         }
 221                                 s->init_buf=buf;
 222                                 buf=NULL;
 223                                 }
 224
 225                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 226
 227                         /* setup buffing BIO */
 228                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 229
 230                         /* don't push the buffering BIO quite yet */
 231
 232                         ssl3_init_finished_mac(s);
 233
 234                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 235                         s->ctx->stats.sess_connect++;
 236                         s->init_num=0;
 237                         break;
 238
 239                 case SSL3_ST_CW_CLNT_HELLO_A:
 240                 case SSL3_ST_CW_CLNT_HELLO_B:
 241
 242                         s->shutdown=0;
 243                         ret=dtls1_client_hello(s);
 244                         if (ret <= 0) goto end;
 245
 246                         if ( s->d1->send_cookie)
 247                                 {
 248                                 s->state=SSL3_ST_CW_FLUSH;
 249                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 250                                 }
 251                         else
 252                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 253
 254                         s->init_num=0;
 255
 256                         /* turn on buffering for the next lot of output */
 257                         if (s->bbio != s->wbio)
 258                                 s->wbio=BIO_push(s->bbio,s->wbio);
 259
 260                         break;
 261
 262                 case SSL3_ST_CR_SRVR_HELLO_A:
 263                 case SSL3_ST_CR_SRVR_HELLO_B:
 264                         ret=ssl3_get_server_hello(s);
 265                         if (ret <= 0) goto end;
 266                         else
 267                                 {
 268                                 if (s->hit)
 269                                         s->state=SSL3_ST_CR_FINISHED_A;
 270                                 else
 271                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 272                                 }
 273                         s->init_num=0;
 274                         break;
 275
 276                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 277                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 278
 279                         ret = dtls1_get_hello_verify(s);
 280                         if ( ret <= 0)
 281                                 goto end;
 282                         if ( s->d1->send_cookie) /* start again, with a cookie */
 283                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 284                         else
 285                                 s->state = SSL3_ST_CR_CERT_A;
 286                         s->init_num = 0;
 287                         break;
 288
 289                 case SSL3_ST_CR_CERT_A:
 290                 case SSL3_ST_CR_CERT_B:
 291                         /* Check if it is anon DH */
 292                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 293                                 {
 294                                 ret=ssl3_get_server_certificate(s);
 295                                 if (ret <= 0) goto end;
 296                                 }
 297                         else
 298                                 skip=1;
 299                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 300                         s->init_num=0;
 301                         break;
 302
 303                 case SSL3_ST_CR_KEY_EXCH_A:
 304                 case SSL3_ST_CR_KEY_EXCH_B:
 305                         ret=ssl3_get_key_exchange(s);
 306                         if (ret <= 0) goto end;
 307                         s->state=SSL3_ST_CR_CERT_REQ_A;
 308                         s->init_num=0;
 309
 310                         /* at this point we check that we have the
 311                          * required stuff from the server */
 312                         if (!ssl3_check_cert_and_algorithm(s))
 313                                 {
 314                                 ret= -1;
 315                                 goto end;
 316                                 }
 317                         break;
 318
 319                 case SSL3_ST_CR_CERT_REQ_A:
 320                 case SSL3_ST_CR_CERT_REQ_B:
 321                         ret=ssl3_get_certificate_request(s);
 322                         if (ret <= 0) goto end;
 323                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 324                         s->init_num=0;
 325                         break;
 326
 327                 case SSL3_ST_CR_SRVR_DONE_A:
 328                 case SSL3_ST_CR_SRVR_DONE_B:
 329                         ret=ssl3_get_server_done(s);
 330                         if (ret <= 0) goto end;
 331                         if (s->s3->tmp.cert_req)
 332                                 s->state=SSL3_ST_CW_CERT_A;
 333                         else
 334                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 335                         s->init_num=0;
 336
 337                         break;
 338
 339                 case SSL3_ST_CW_CERT_A:
 340                 case SSL3_ST_CW_CERT_B:
 341                 case SSL3_ST_CW_CERT_C:
 342                 case SSL3_ST_CW_CERT_D:
 343                         ret=dtls1_send_client_certificate(s);
 344                         if (ret <= 0) goto end;
 345                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 346                         s->init_num=0;
 347                         break;
 348
 349                 case SSL3_ST_CW_KEY_EXCH_A:
 350                 case SSL3_ST_CW_KEY_EXCH_B:
 351                         ret=dtls1_send_client_key_exchange(s);
 352                         if (ret <= 0) goto end;
 353                         l=s->s3->tmp.new_cipher->algorithms;
 354                         /* EAY EAY EAY need to check for DH fix cert
 355                          * sent back */
 356                         /* For TLS, cert_req is set to 2, so a cert chain
 357                          * of nothing is sent, but no verify packet is sent */
 358                         if (s->s3->tmp.cert_req == 1)
 359                                 {
 360                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 361                                 }
 362                         else
 363                                 {
 364                                 s->state=SSL3_ST_CW_CHANGE_A;
 365                                 s->s3->change_cipher_spec=0;
 366                                 }
 367
 368                         s->init_num=0;
 369                         break;
 370
 371                 case SSL3_ST_CW_CERT_VRFY_A:
 372                 case SSL3_ST_CW_CERT_VRFY_B:
 373                         ret=dtls1_send_client_verify(s);
 374                         if (ret <= 0) goto end;
 375                         s->state=SSL3_ST_CW_CHANGE_A;
 376                         s->init_num=0;
 377                         s->s3->change_cipher_spec=0;
 378                         break;
 379
 380                 case SSL3_ST_CW_CHANGE_A:
 381                 case SSL3_ST_CW_CHANGE_B:
 382                         ret=dtls1_send_change_cipher_spec(s,
 383                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 384                         if (ret <= 0) goto end;
 385                         s->state=SSL3_ST_CW_FINISHED_A;
 386                         s->init_num=0;
 387
 388                         s->session->cipher=s->s3->tmp.new_cipher;
 389                         if (s->s3->tmp.new_compression == NULL)
 390                                 s->session->compress_meth=0;
 391                         else
 392                                 s->session->compress_meth=
 393                                         s->s3->tmp.new_compression->id;
 394                         if (!s->method->ssl3_enc->setup_key_block(s))
 395                                 {
 396                                 ret= -1;
 397                                 goto end;
 398                                 }
 399
 400                         if (!s->method->ssl3_enc->change_cipher_state(s,
 401                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 402                                 {
 403                                 ret= -1;
 404                                 goto end;
 405                                 }
 406
 407                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 408                         break;
 409
 410                 case SSL3_ST_CW_FINISHED_A:
 411                 case SSL3_ST_CW_FINISHED_B:
 412                         ret=dtls1_send_finished(s,
 413                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 414                                 s->method->ssl3_enc->client_finished_label,
 415                                 s->method->ssl3_enc->client_finished_label_len);
 416                         if (ret <= 0) goto end;
 417                         s->state=SSL3_ST_CW_FLUSH;
 418
 419                         /* clear flags */
 420                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 421                         if (s->hit)
 422                                 {
 423                                 s->s3->tmp.next_state=SSL_ST_OK;
 424                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 425                                         {
 426                                         s->state=SSL_ST_OK;
 427                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 428                                         s->s3->delay_buf_pop_ret=0;
 429                                         }
 430                                 }
 431                         else
 432                                 {
 433                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 434                                 }
 435                         s->init_num=0;
 436                         break;
 437
 438                 case SSL3_ST_CR_FINISHED_A:
 439                 case SSL3_ST_CR_FINISHED_B:
 440
 441                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 442                                 SSL3_ST_CR_FINISHED_B);
 443                         if (ret <= 0) goto end;
 444
 445                         if (s->hit)
 446                                 s->state=SSL3_ST_CW_CHANGE_A;
 447                         else
 448                                 s->state=SSL_ST_OK;
 449                         s->init_num=0;
 450                         break;
 451
 452                 case SSL3_ST_CW_FLUSH:
 453                         /* number of bytes to be flushed */
 454                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 455                         if (num1 > 0)
 456                                 {
 457                                 s->rwstate=SSL_WRITING;
 458                                 num1=BIO_flush(s->wbio);
 459                                 if (num1 <= 0) { ret= -1; goto end; }
 460                                 s->rwstate=SSL_NOTHING;
 461                                 }
 462
 463                         s->state=s->s3->tmp.next_state;
 464                         break;
 465
 466                 case SSL_ST_OK:
 467                         /* clean a few things up */
 468                         ssl3_cleanup_key_block(s);
 469
 470 #if 0
 471                         if (s->init_buf != NULL)
 472                                 {
 473                                 BUF_MEM_free(s->init_buf);
 474                                 s->init_buf=NULL;
 475                                 }
 476 #endif
 477
 478                         /* If we are not 'joining' the last two packets,
 479                          * remove the buffering now */
 480                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 481                                 ssl_free_wbio_buffer(s);
 482                         /* else do it later in ssl3_write */
 483
 484                         s->init_num=0;
 485                         s->new_session=0;
 486
 487                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 488                         if (s->hit) s->ctx->stats.sess_hit++;
 489
 490                         ret=1;
 491                         /* s->server=0; */
 492                         s->handshake_func=dtls1_connect;
 493                         s->ctx->stats.sess_connect_good++;
 494
 495                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 496
 497                         /* done with handshaking */
 498                         s->d1->handshake_read_seq  = 0;
 499                         goto end;
 500                         /* break; */
 501
 502                 default:
 503                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 504                         ret= -1;
 505                         goto end;
 506                         /* break; */
 507                         }
 508
 509                 /* did we do anything */
 510                 if (!s->s3->tmp.reuse_message && !skip)
 511                         {
 512                         if (s->debug)
 513                                 {
 514                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 515                                         goto end;
 516                                 }
 517
 518                         if ((cb != NULL) && (s->state != state))
 519                                 {
 520                                 new_state=s->state;
 521                                 s->state=state;
 522                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 523                                 s->state=new_state;
 524                                 }
 525                         }
 526                 skip=0;
 527                 }
 528 end:
 529         s->in_handshake--;
 530         if (buf != NULL)
 531                 BUF_MEM_free(buf);
 532         if (cb != NULL)
 533                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 534         return(ret);
 535         }
 536
 537 int dtls1_client_hello(SSL *s)
 538         {
 539         unsigned char *buf;
 540         unsigned char *p,*d;
 541         int i,j;
 542         unsigned long Time,l;
 543         SSL_COMP *comp;
 544
 545         buf=(unsigned char *)s->init_buf->data;
 546         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 547                 {
 548                 if ((s->session == NULL) ||
 549                         (s->session->ssl_version != s->version) ||
 550                         (s->session->not_resumable))
 551                         {
 552                         if (!ssl_get_new_session(s,0))
 553                                 goto err;
 554                         }
 555                 /* else use the pre-loaded session */
 556
 557                 p=s->s3->client_random;
 558                 Time=time(NULL);                        /* Time */
 559                 l2n(Time,p);
 560                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 561
 562                 /* Do the message type and length last */
 563                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 564
 565                 *(p++)=s->version>>8;
 566                 *(p++)=s->version&0xff;
 567                 s->client_version=s->version;
 568
 569                 /* Random stuff */
 570                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 571                 p+=SSL3_RANDOM_SIZE;
 572
 573                 /* Session ID */
 574                 if (s->new_session)
 575                         i=0;
 576                 else
 577                         i=s->session->session_id_length;
 578                 *(p++)=i;
 579                 if (i != 0)
 580                         {
 581                         if (i > sizeof s->session->session_id)
 582                                 {
 583                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 584                                 goto err;
 585                                 }
 586                         memcpy(p,s->session->session_id,i);
 587                         p+=i;
 588                         }
 589
 590                 /* cookie stuff */
 591                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 592                         {
 593                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 594                         goto err;
 595                         }
 596                 *(p++) = s->d1->cookie_len;
 597                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 598                 p += s->d1->cookie_len;
 599
 600                 /* Ciphers supported */
 601                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 602                 if (i == 0)
 603                         {
 604                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 605                         goto err;
 606                         }
 607                 s2n(i,p);
 608                 p+=i;
 609
 610                 /* COMPRESSION */
 611                 if (s->ctx->comp_methods == NULL)
 612                         j=0;
 613                 else
 614                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 615                 *(p++)=1+j;
 616                 for (i=0; i<j; i++)
 617                         {
 618                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 619                         *(p++)=comp->id;
 620                         }
 621                 *(p++)=0; /* Add the NULL method */
 622
 623                 l=(p-d);
 624                 d=buf;
 625
 626                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 627
 628                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 629                 /* number of bytes to write */
 630                 s->init_num=p-buf;
 631                 s->init_off=0;
 632
 633                 /* buffer the message to handle re-xmits */
 634                 dtls1_buffer_message(s, 0);
 635                 }
 636
 637         /* SSL3_ST_CW_CLNT_HELLO_B */
 638         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 639 err:
 640         return(-1);
 641         }
 642
 643 static int dtls1_get_hello_verify(SSL *s)
 644         {
 645         int n, al, ok = 0;
 646         unsigned char *data;
 647         unsigned int cookie_len;
 648
 649         n=s->method->ssl_get_message(s,
 650                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 651                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 652                 -1,
 653                 s->max_cert_list,
 654                 &ok);
 655
 656         if (!ok) return((int)n);
 657
 658         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 659                 {
 660                 s->d1->send_cookie = 0;
 661                 s->s3->tmp.reuse_message=1;
 662                 return(1);
 663                 }
 664
 665         data = (unsigned char *)s->init_msg;
 666
 667         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 668                 {
 669                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 670                 s->version=(s->version&0xff00)|data[1];
 671                 al = SSL_AD_PROTOCOL_VERSION;
 672                 goto f_err;
 673                 }
 674         data+=2;
 675
 676         cookie_len = *(data++);
 677         if ( cookie_len > sizeof(s->d1->cookie))
 678                 {
 679                 al=SSL_AD_ILLEGAL_PARAMETER;
 680                 goto f_err;
 681                 }
 682
 683         memcpy(s->d1->cookie, data, cookie_len);
 684         s->d1->cookie_len = cookie_len;
 685
 686         s->d1->send_cookie = 1;
 687         return 1;
 688
 689 f_err:
 690         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 691         return -1;
 692         }
 693
 694 int dtls1_send_client_key_exchange(SSL *s)
 695         {
 696         unsigned char *p,*d;
 697         int n;
 698         unsigned long l;
 699 #ifndef OPENSSL_NO_RSA
 700         unsigned char *q;
 701         EVP_PKEY *pkey=NULL;
 702 #endif
 703 #ifndef OPENSSL_NO_KRB5
 704         KSSL_ERR kssl_err;
 705 #endif /* OPENSSL_NO_KRB5 */
 706
 707         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
 708                 {
 709                 d=(unsigned char *)s->init_buf->data;
 710                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 711
 712                 l=s->s3->tmp.new_cipher->algorithms;
 713
 714                 /* Fool emacs indentation */
 715                 if (0) {}
 716 #ifndef OPENSSL_NO_RSA
 717                 else if (l & SSL_kRSA)
 718                         {
 719                         RSA *rsa;
 720                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 721
 722                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
 723                                 rsa=s->session->sess_cert->peer_rsa_tmp;
 724                         else
 725                                 {
 726                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 727                                 if ((pkey == NULL) ||
 728                                         (pkey->type != EVP_PKEY_RSA) ||
 729                                         (pkey->pkey.rsa == NULL))
 730                                         {
 731                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 732                                         goto err;
 733                                         }
 734                                 rsa=pkey->pkey.rsa;
 735                                 EVP_PKEY_free(pkey);
 736                                 }
 737
 738                         tmp_buf[0]=s->client_version>>8;
 739                         tmp_buf[1]=s->client_version&0xff;
 740                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
 741                                         goto err;
 742
 743                         s->session->master_key_length=sizeof tmp_buf;
 744
 745                         q=p;
 746                         /* Fix buf for TLS and beyond */
 747                         if (s->version > SSL3_VERSION)
 748                                 p+=2;
 749                         n=RSA_public_encrypt(sizeof tmp_buf,
 750                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
 751 #ifdef PKCS1_CHECK
 752                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
 753                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
 754 #endif
 755                         if (n <= 0)
 756                                 {
 757                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
 758                                 goto err;
 759                                 }
 760
 761                         /* Fix buf for TLS and beyond */
 762                         if (s->version > SSL3_VERSION)
 763                                 {
 764                                 s2n(n,q);
 765                                 n+=2;
 766                                 }
 767
 768                         s->session->master_key_length=
 769                                 s->method->ssl3_enc->generate_master_secret(s,
 770                                         s->session->master_key,
 771                                         tmp_buf,sizeof tmp_buf);
 772                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
 773                         }
 774 #endif
 775 #ifndef OPENSSL_NO_KRB5
 776                 else if (l & SSL_kKRB5)
 777                         {
 778                         krb5_error_code krb5rc;
 779                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
 780                         /*  krb5_data   krb5_ap_req;  */
 781                         krb5_data       *enc_ticket;
 782                         krb5_data       authenticator, *authp = NULL;
 783                         EVP_CIPHER_CTX  ciph_ctx;
 784                         EVP_CIPHER      *enc = NULL;
 785                         unsigned char   iv[EVP_MAX_IV_LENGTH];
 786                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 787                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
 788                                                 + EVP_MAX_IV_LENGTH];
 789                         int             padl, outl = sizeof(epms);
 790
 791                         EVP_CIPHER_CTX_init(&ciph_ctx);
 792
 793 #ifdef KSSL_DEBUG
 794                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
 795                                 l, SSL_kKRB5);
 796 #endif  /* KSSL_DEBUG */
 797
 798                         authp = NULL;
 799 #ifdef KRB5SENDAUTH
 800                         if (KRB5SENDAUTH)  authp = &authenticator;
 801 #endif  /* KRB5SENDAUTH */
 802
 803                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
 804                                 &kssl_err);
 805                         enc = kssl_map_enc(kssl_ctx->enctype);
 806                         if (enc == NULL)
 807                             goto err;
 808 #ifdef KSSL_DEBUG
 809                         {
 810                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
 811                         if (krb5rc && kssl_err.text)
 812                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
 813                         }
 814 #endif  /* KSSL_DEBUG */
 815
 816                         if (krb5rc)
 817                                 {
 818                                 ssl3_send_alert(s,SSL3_AL_FATAL,
 819                                                 SSL_AD_HANDSHAKE_FAILURE);
 820                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 821                                                 kssl_err.reason);
 822                                 goto err;
 823                                 }
 824
 825                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
 826                         **  in place of RFC 2712 KerberosWrapper, as in:
 827                         **
 828                         **  Send ticket (copy to *p, set n = length)
 829                         **  n = krb5_ap_req.length;
 830                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
 831                         **  if (krb5_ap_req.data)
 832                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
 833                         **
 834                         **  Now using real RFC 2712 KerberosWrapper
 835                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
 836                         **  Note: 2712 "opaque" types are here replaced
 837                         **  with a 2-byte length followed by the value.
 838                         **  Example:
 839                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
 840                         **  Where "xx xx" = length bytes.  Shown here with
 841                         **  optional authenticator omitted.
 842                         */
 843
 844                         /*  KerberosWrapper.Ticket              */
 845                         s2n(enc_ticket->length,p);
 846                         memcpy(p, enc_ticket->data, enc_ticket->length);
 847                         p+= enc_ticket->length;
 848                         n = enc_ticket->length + 2;
 849
 850                         /*  KerberosWrapper.Authenticator       */
 851                         if (authp  &&  authp->length)
 852                                 {
 853                                 s2n(authp->length,p);
 854                                 memcpy(p, authp->data, authp->length);
 855                                 p+= authp->length;
 856                                 n+= authp->length + 2;
 857
 858                                 free(authp->data);
 859                                 authp->data = NULL;
 860                                 authp->length = 0;
 861                                 }
 862                         else
 863                                 {
 864                                 s2n(0,p);/*  null authenticator length  */
 865                                 n+=2;
 866                                 }
 867
 868                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
 869                             goto err;
 870
 871                         /*  20010420 VRS.  Tried it this way; failed.
 872                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
 873                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
 874                         **                              kssl_ctx->length);
 875                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
 876                         */
 877
 878                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
 879                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
 880                                 kssl_ctx->key,iv);
 881                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
 882                                 sizeof tmp_buf);
 883                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
 884                         outl += padl;
 885                         if (outl > sizeof epms)
 886                                 {
 887                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 888                                 goto err;
 889                                 }
 890                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
 891
 892                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
 893                         s2n(outl,p);
 894                         memcpy(p, epms, outl);
 895                         p+=outl;
 896                         n+=outl + 2;
 897
 898                         s->session->master_key_length=
 899                                 s->method->ssl3_enc->generate_master_secret(s,
 900                                         s->session->master_key,
 901                                         tmp_buf, sizeof tmp_buf);
 902
 903                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
 904                         OPENSSL_cleanse(epms, outl);
 905                         }
 906 #endif
 907 #ifndef OPENSSL_NO_DH
 908                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 909                         {
 910                         DH *dh_srvr,*dh_clnt;
 911
 912                         if (s->session->sess_cert->peer_dh_tmp != NULL)
 913                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
 914                         else
 915                                 {
 916                                 /* we get them from the cert */
 917                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 918                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
 919                                 goto err;
 920                                 }
 921
 922                         /* generate a new random key */
 923                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
 924                                 {
 925                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 926                                 goto err;
 927                                 }
 928                         if (!DH_generate_key(dh_clnt))
 929                                 {
 930                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 931                                 goto err;
 932                                 }
 933
 934                         /* use the 'p' output buffer for the DH key, but
 935                          * make sure to clear it out afterwards */
 936
 937                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
 938
 939                         if (n <= 0)
 940                                 {
 941                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 942                                 goto err;
 943                                 }
 944
 945                         /* generate master key from the result */
 946                         s->session->master_key_length=
 947                                 s->method->ssl3_enc->generate_master_secret(s,
 948                                         s->session->master_key,p,n);
 949                         /* clean up */
 950                         memset(p,0,n);
 951
 952                         /* send off the data */
 953                         n=BN_num_bytes(dh_clnt->pub_key);
 954                         s2n(n,p);
 955                         BN_bn2bin(dh_clnt->pub_key,p);
 956                         n+=2;
 957
 958                         DH_free(dh_clnt);
 959
 960                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
 961                         }
 962 #endif
 963                 else
 964                         {
 965                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 966                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 967                         goto err;
 968                         }
 969
 970                 d = dtls1_set_message_header(s, d,
 971                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
 972                 /*
 973                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
 974                  l2n3(n,d);
 975                  l2n(s->d1->handshake_write_seq,d);
 976                  s->d1->handshake_write_seq++;
 977                 */
 978
 979                 s->state=SSL3_ST_CW_KEY_EXCH_B;
 980                 /* number of bytes to write */
 981                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
 982                 s->init_off=0;
 983
 984                 /* buffer the message to handle re-xmits */
 985                 dtls1_buffer_message(s, 0);
 986                 }
 987
 988         /* SSL3_ST_CW_KEY_EXCH_B */
 989         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 990 err:
 991         return(-1);
 992         }
 993
 994 int dtls1_send_client_verify(SSL *s)
 995         {
 996         unsigned char *p,*d;
 997         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 998         EVP_PKEY *pkey;
 999 #ifndef OPENSSL_NO_RSA
1000         unsigned u=0;
1001 #endif
1002         unsigned long n;
1003 #ifndef OPENSSL_NO_DSA
1004         int j;
1005 #endif
1006
1007         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1008                 {
1009                 d=(unsigned char *)s->init_buf->data;
1010                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1011                 pkey=s->cert->key->privatekey;
1012
1013                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1014                         &(data[MD5_DIGEST_LENGTH]));
1015
1016 #ifndef OPENSSL_NO_RSA
1017                 if (pkey->type == EVP_PKEY_RSA)
1018                         {
1019                         s->method->ssl3_enc->cert_verify_mac(s,
1020                                 &(s->s3->finish_dgst1),&(data[0]));
1021                         if (RSA_sign(NID_md5_sha1, data,
1022                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1023                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1024                                 {
1025                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1026                                 goto err;
1027                                 }
1028                         s2n(u,p);
1029                         n=u+2;
1030                         }
1031                 else
1032 #endif
1033 #ifndef OPENSSL_NO_DSA
1034                         if (pkey->type == EVP_PKEY_DSA)
1035                         {
1036                         if (!DSA_sign(pkey->save_type,
1037                                 &(data[MD5_DIGEST_LENGTH]),
1038                                 SHA_DIGEST_LENGTH,&(p[2]),
1039                                 (unsigned int *)&j,pkey->pkey.dsa))
1040                                 {
1041                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1042                                 goto err;
1043                                 }
1044                         s2n(j,p);
1045                         n=j+2;
1046                         }
1047                 else
1048 #endif
1049                         {
1050                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1051                         goto err;
1052                         }
1053
1054                 d = dtls1_set_message_header(s, d,
1055                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1056
1057                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1058                 s->init_off=0;
1059
1060                 /* buffer the message to handle re-xmits */
1061                 dtls1_buffer_message(s, 0);
1062
1063                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1064                 }
1065
1066         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1067         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1068 err:
1069         return(-1);
1070         }
1071
1072 int dtls1_send_client_certificate(SSL *s)
1073         {
1074         X509 *x509=NULL;
1075         EVP_PKEY *pkey=NULL;
1076         int i;
1077         unsigned long l;
1078
1079         if (s->state == SSL3_ST_CW_CERT_A)
1080                 {
1081                 if ((s->cert == NULL) ||
1082                         (s->cert->key->x509 == NULL) ||
1083                         (s->cert->key->privatekey == NULL))
1084                         s->state=SSL3_ST_CW_CERT_B;
1085                 else
1086                         s->state=SSL3_ST_CW_CERT_C;
1087                 }
1088
1089         /* We need to get a client cert */
1090         if (s->state == SSL3_ST_CW_CERT_B)
1091                 {
1092                 /* If we get an error, we need to
1093                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1094                  * We then get retied later */
1095                 i=0;
1096                 if (s->ctx->client_cert_cb != NULL)
1097                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1098                 if (i < 0)
1099                         {
1100                         s->rwstate=SSL_X509_LOOKUP;
1101                         return(-1);
1102                         }
1103                 s->rwstate=SSL_NOTHING;
1104                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1105                         {
1106                         s->state=SSL3_ST_CW_CERT_B;
1107                         if (    !SSL_use_certificate(s,x509) ||
1108                                 !SSL_use_PrivateKey(s,pkey))
1109                                 i=0;
1110                         }
1111                 else if (i == 1)
1112                         {
1113                         i=0;
1114                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1115                         }
1116
1117                 if (x509 != NULL) X509_free(x509);
1118                 if (pkey != NULL) EVP_PKEY_free(pkey);
1119                 if (i == 0)
1120                         {
1121                         if (s->version == SSL3_VERSION)
1122                                 {
1123                                 s->s3->tmp.cert_req=0;
1124                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1125                                 return(1);
1126                                 }
1127                         else
1128                                 {
1129                                 s->s3->tmp.cert_req=2;
1130                                 }
1131                         }
1132
1133                 /* Ok, we have a cert */
1134                 s->state=SSL3_ST_CW_CERT_C;
1135                 }
1136
1137         if (s->state == SSL3_ST_CW_CERT_C)
1138                 {
1139                 s->state=SSL3_ST_CW_CERT_D;
1140                 l=dtls1_output_cert_chain(s,
1141                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1142                 s->init_num=(int)l;
1143                 s->init_off=0;
1144
1145                 /* set header called by dtls1_output_cert_chain() */
1146
1147                 /* buffer the message to handle re-xmits */
1148                 dtls1_buffer_message(s, 0);
1149                 }
1150         /* SSL3_ST_CW_CERT_D */
1151         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1152         }
1153
1154