ssl/d1_pkt.c

   1 /* ssl/d1_pkt.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1998-2005 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 <errno.h>
 118 #define USE_SOCKETS
 119 #include "ssl_locl.h"
 120 #include <openssl/evp.h>
 121 #include <openssl/buffer.h>
 122 #include <openssl/pqueue.h>
 123 #include <openssl/rand.h>
 124
 125 static int have_handshake_fragment(SSL *s, int type, unsigned char *buf,
 126         int len, int peek);
 127 static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap,
 128         PQ_64BIT *seq_num);
 129 static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap);
 130 static DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr,
 131     unsigned int *is_next_epoch);
 132 #if 0
 133 static int dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr,
 134         unsigned short *priority, unsigned long *offset);
 135 #endif
 136 static int dtls1_buffer_record(SSL *s, record_pqueue *q,
 137         PQ_64BIT *priority);
 138 static int dtls1_process_record(SSL *s);
 139 #if PQ_64BIT_IS_INTEGER
 140 static PQ_64BIT bytes_to_long_long(unsigned char *bytes, PQ_64BIT *num);
 141 #endif
 142 static void dtls1_clear_timeouts(SSL *s);
 143
 144 /* copy buffered record into SSL structure */
 145 static int
 146 dtls1_copy_record(SSL *s, pitem *item)
 147     {
 148     DTLS1_RECORD_DATA *rdata;
 149
 150     rdata = (DTLS1_RECORD_DATA *)item->data;
 151
 152     if (s->s3->rbuf.buf != NULL)
 153         OPENSSL_free(s->s3->rbuf.buf);
 154
 155     s->packet = rdata->packet;
 156     s->packet_length = rdata->packet_length;
 157     memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
 158     memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
 159
 160         /* Set proper sequence number for mac calculation */
 161         memcpy(&(s->s3->read_sequence[2]), &(rdata->packet[5]), 6);
 162
 163     return(1);
 164     }
 165
 166
 167 static int
 168 dtls1_buffer_record(SSL *s, record_pqueue *queue, PQ_64BIT *priority)
 169 {
 170     DTLS1_RECORD_DATA *rdata;
 171         pitem *item;
 172
 173         /* Limit the size of the queue to prevent DOS attacks */
 174         if (pqueue_size(queue->q) >= 100)
 175                 return 0;
 176
 177         rdata = OPENSSL_malloc(sizeof(DTLS1_RECORD_DATA));
 178         item = pitem_new(*priority, rdata);
 179         if (rdata == NULL || item == NULL)
 180                 {
 181                 if (rdata != NULL) OPENSSL_free(rdata);
 182                 if (item != NULL) pitem_free(item);
 183
 184                 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
 185                 return(0);
 186                 }
 187
 188         rdata->packet = s->packet;
 189         rdata->packet_length = s->packet_length;
 190         memcpy(&(rdata->rbuf), &(s->s3->rbuf), sizeof(SSL3_BUFFER));
 191         memcpy(&(rdata->rrec), &(s->s3->rrec), sizeof(SSL3_RECORD));
 192
 193         item->data = rdata;
 194
 195         /* insert should not fail, since duplicates are dropped */
 196         if (pqueue_insert(queue->q, item) == NULL)
 197                 {
 198                 OPENSSL_free(rdata);
 199                 pitem_free(item);
 200                 return(0);
 201                 }
 202
 203         s->packet = NULL;
 204         s->packet_length = 0;
 205         memset(&(s->s3->rbuf), 0, sizeof(SSL3_BUFFER));
 206         memset(&(s->s3->rrec), 0, sizeof(SSL3_RECORD));
 207
 208         if (!ssl3_setup_buffers(s))
 209                 {
 210                 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
 211                 OPENSSL_free(rdata);
 212                 pitem_free(item);
 213                 return(0);
 214                 }
 215
 216         return(1);
 217     }
 218
 219
 220 static int
 221 dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue)
 222     {
 223     pitem *item;
 224
 225     item = pqueue_pop(queue->q);
 226     if (item)
 227         {
 228         dtls1_copy_record(s, item);
 229
 230         OPENSSL_free(item->data);
 231                 pitem_free(item);
 232
 233         return(1);
 234         }
 235
 236     return(0);
 237     }
 238
 239
 240 /* retrieve a buffered record that belongs to the new epoch, i.e., not processed
 241  * yet */
 242 #define dtls1_get_unprocessed_record(s) \
 243                    dtls1_retrieve_buffered_record((s), \
 244                    &((s)->d1->unprocessed_rcds))
 245
 246 /* retrieve a buffered record that belongs to the current epoch, ie, processed */
 247 #define dtls1_get_processed_record(s) \
 248                    dtls1_retrieve_buffered_record((s), \
 249                    &((s)->d1->processed_rcds))
 250
 251 static int
 252 dtls1_process_buffered_records(SSL *s)
 253     {
 254     pitem *item;
 255
 256     item = pqueue_peek(s->d1->unprocessed_rcds.q);
 257     if (item)
 258         {
 259         /* Check if epoch is current. */
 260         if (s->d1->unprocessed_rcds.epoch != s->d1->r_epoch)
 261             return(1);  /* Nothing to do. */
 262
 263         /* Process all the records. */
 264         while (pqueue_peek(s->d1->unprocessed_rcds.q))
 265             {
 266             dtls1_get_unprocessed_record(s);
 267             if ( ! dtls1_process_record(s))
 268                 return(0);
 269             dtls1_buffer_record(s, &(s->d1->processed_rcds),
 270                 &s->s3->rrec.seq_num);
 271             }
 272         }
 273
 274     /* sync epoch numbers once all the unprocessed records
 275      * have been processed */
 276     s->d1->processed_rcds.epoch = s->d1->r_epoch;
 277     s->d1->unprocessed_rcds.epoch = s->d1->r_epoch + 1;
 278
 279     return(1);
 280     }
 281
 282
 283 #if 0
 284
 285 static int
 286 dtls1_get_buffered_record(SSL *s)
 287         {
 288         pitem *item;
 289         PQ_64BIT priority =
 290                 (((PQ_64BIT)s->d1->handshake_read_seq) << 32) |
 291                 ((PQ_64BIT)s->d1->r_msg_hdr.frag_off);
 292
 293         if ( ! SSL_in_init(s))  /* if we're not (re)negotiating,
 294                                                            nothing buffered */
 295                 return 0;
 296
 297
 298         item = pqueue_peek(s->d1->rcvd_records);
 299         if (item && item->priority == priority)
 300                 {
 301                 /* Check if we've received the record of interest.  It must be
 302                  * a handshake record, since data records as passed up without
 303                  * buffering */
 304                 DTLS1_RECORD_DATA *rdata;
 305                 item = pqueue_pop(s->d1->rcvd_records);
 306                 rdata = (DTLS1_RECORD_DATA *)item->data;
 307
 308                 if (s->s3->rbuf.buf != NULL)
 309                         OPENSSL_free(s->s3->rbuf.buf);
 310
 311                 s->packet = rdata->packet;
 312                 s->packet_length = rdata->packet_length;
 313                 memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
 314                 memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
 315
 316                 OPENSSL_free(item->data);
 317                 pitem_free(item);
 318
 319                 /* s->d1->next_expected_seq_num++; */
 320                 return(1);
 321                 }
 322
 323         return 0;
 324         }
 325
 326 #endif
 327
 328 static int
 329 dtls1_process_record(SSL *s)
 330 {
 331     int al;
 332         int clear=0;
 333     int enc_err;
 334         SSL_SESSION *sess;
 335     SSL3_RECORD *rr;
 336         unsigned int mac_size;
 337         unsigned char md[EVP_MAX_MD_SIZE];
 338
 339
 340         rr= &(s->s3->rrec);
 341     sess = s->session;
 342
 343         /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
 344          * and we have that many bytes in s->packet
 345          */
 346         rr->input= &(s->packet[DTLS1_RT_HEADER_LENGTH]);
 347
 348         /* ok, we can now read from 's->packet' data into 'rr'
 349          * rr->input points at rr->length bytes, which
 350          * need to be copied into rr->data by either
 351          * the decryption or by the decompression
 352          * When the data is 'copied' into the rr->data buffer,
 353          * rr->input will be pointed at the new buffer */
 354
 355         /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
 356          * rr->length bytes of encrypted compressed stuff. */
 357
 358         /* check is not needed I believe */
 359         if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
 360                 {
 361                 al=SSL_AD_RECORD_OVERFLOW;
 362                 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
 363                 goto f_err;
 364                 }
 365
 366         /* decrypt in place in 'rr->input' */
 367         rr->data=rr->input;
 368
 369         enc_err = s->method->ssl3_enc->enc(s,0);
 370         if (enc_err <= 0)
 371                 {
 372                 if (enc_err == 0)
 373                         /* SSLerr() and ssl3_send_alert() have been called */
 374                         goto err;
 375
 376                 /* otherwise enc_err == -1 */
 377                 goto err;
 378                 }
 379
 380 #ifdef TLS_DEBUG
 381 printf("dec %d\n",rr->length);
 382 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
 383 printf("\n");
 384 #endif
 385
 386         /* r->length is now the compressed data plus mac */
 387 if (    (sess == NULL) ||
 388                 (s->enc_read_ctx == NULL) ||
 389                 (s->read_hash == NULL))
 390     clear=1;
 391
 392         if (!clear)
 393                 {
 394                 mac_size=EVP_MD_size(s->read_hash);
 395
 396                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+mac_size)
 397                         {
 398 #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
 399                         al=SSL_AD_RECORD_OVERFLOW;
 400                         SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
 401                         goto f_err;
 402 #else
 403                         goto err;
 404 #endif
 405                         }
 406                 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
 407                 if (rr->length < mac_size)
 408                         {
 409 #if 0 /* OK only for stream ciphers */
 410                         al=SSL_AD_DECODE_ERROR;
 411                         SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_LENGTH_TOO_SHORT);
 412                         goto f_err;
 413 #else
 414                         goto err;
 415 #endif
 416                         }
 417                 rr->length-=mac_size;
 418                 s->method->ssl3_enc->mac(s,md,0);
 419                 if (memcmp(md,&(rr->data[rr->length]),mac_size) != 0)
 420                         {
 421                         goto err;
 422                         }
 423                 }
 424
 425         /* r->length is now just compressed */
 426         if (s->expand != NULL)
 427                 {
 428                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH)
 429                         {
 430                         al=SSL_AD_RECORD_OVERFLOW;
 431                         SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
 432                         goto f_err;
 433                         }
 434                 if (!ssl3_do_uncompress(s))
 435                         {
 436                         al=SSL_AD_DECOMPRESSION_FAILURE;
 437                         SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_BAD_DECOMPRESSION);
 438                         goto f_err;
 439                         }
 440                 }
 441
 442         if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH)
 443                 {
 444                 al=SSL_AD_RECORD_OVERFLOW;
 445                 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
 446                 goto f_err;
 447                 }
 448
 449         rr->off=0;
 450         /* So at this point the following is true
 451          * ssl->s3->rrec.type   is the type of record
 452          * ssl->s3->rrec.length == number of bytes in record
 453          * ssl->s3->rrec.off    == offset to first valid byte
 454          * ssl->s3->rrec.data   == where to take bytes from, increment
 455          *                         after use :-).
 456          */
 457
 458         /* we have pulled in a full packet so zero things */
 459         s->packet_length=0;
 460     dtls1_record_bitmap_update(s, &(s->d1->bitmap));/* Mark receipt of record. */
 461     return(1);
 462
 463 f_err:
 464         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 465 err:
 466         return(0);
 467 }
 468
 469
 470 /* Call this to get a new input record.
 471  * It will return <= 0 if more data is needed, normally due to an error
 472  * or non-blocking IO.
 473  * When it finishes, one packet has been decoded and can be found in
 474  * ssl->s3->rrec.type    - is the type of record
 475  * ssl->s3->rrec.data,   - data
 476  * ssl->s3->rrec.length, - number of bytes
 477  */
 478 /* used only by dtls1_read_bytes */
 479 int dtls1_get_record(SSL *s)
 480         {
 481         int ssl_major,ssl_minor;
 482         int i,n;
 483         SSL3_RECORD *rr;
 484         unsigned char *p = NULL;
 485         unsigned short version;
 486         DTLS1_BITMAP *bitmap;
 487         unsigned int is_next_epoch;
 488
 489         rr= &(s->s3->rrec);
 490
 491     /* The epoch may have changed.  If so, process all the
 492      * pending records.  This is a non-blocking operation. */
 493     dtls1_process_buffered_records(s);
 494
 495         /* if we're renegotiating, then there may be buffered records */
 496         if (dtls1_get_processed_record(s))
 497                 return 1;
 498
 499         /* get something from the wire */
 500 again:
 501         /* check if we have the header */
 502         if (    (s->rstate != SSL_ST_READ_BODY) ||
 503                 (s->packet_length < DTLS1_RT_HEADER_LENGTH))
 504                 {
 505                 n=ssl3_read_n(s, DTLS1_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
 506                 /* read timeout is handled by dtls1_read_bytes */
 507                 if (n <= 0) return(n); /* error or non-blocking */
 508
 509                 /* this packet contained a partial record, dump it */
 510                 if (s->packet_length != DTLS1_RT_HEADER_LENGTH)
 511                         {
 512                         s->packet_length = 0;
 513                         goto again;
 514                         }
 515
 516                 s->rstate=SSL_ST_READ_BODY;
 517
 518                 p=s->packet;
 519
 520                 /* Pull apart the header into the DTLS1_RECORD */
 521                 rr->type= *(p++);
 522                 ssl_major= *(p++);
 523                 ssl_minor= *(p++);
 524                 version=(ssl_major<<8)|ssl_minor;
 525
 526                 /* sequence number is 64 bits, with top 2 bytes = epoch */
 527                 n2s(p,rr->epoch);
 528
 529                 memcpy(&(s->s3->read_sequence[2]), p, 6);
 530                 p+=6;
 531
 532                 n2s(p,rr->length);
 533
 534                 /* Lets check version */
 535                 if (!s->first_packet)
 536                         {
 537                         if (version != s->version && version != DTLS1_BAD_VER)
 538                                 {
 539                                 /* unexpected version, silently discard */
 540                                 rr->length = 0;
 541                                 s->packet_length = 0;
 542                                 goto again;
 543                                 }
 544                         }
 545
 546                 if ((version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
 547                     (version & 0xff00) != (DTLS1_BAD_VER & 0xff00))
 548                         {
 549                         /* wrong version, silently discard record */
 550                         rr->length = 0;
 551                         s->packet_length = 0;
 552                         goto again;
 553                         }
 554
 555                 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
 556                         {
 557                         /* record too long, silently discard it */
 558                         rr->length = 0;
 559                         s->packet_length = 0;
 560                         goto again;
 561                         }
 562
 563                 s->client_version = version;
 564                 /* now s->rstate == SSL_ST_READ_BODY */
 565                 }
 566
 567         /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
 568
 569         if (rr->length > s->packet_length-DTLS1_RT_HEADER_LENGTH)
 570                 {
 571                 /* now s->packet_length == DTLS1_RT_HEADER_LENGTH */
 572                 i=rr->length;
 573                 n=ssl3_read_n(s,i,i,1);
 574                 if (n <= 0) return(n); /* error or non-blocking io */
 575
 576                 /* this packet contained a partial record, dump it */
 577                 if ( n != i)
 578                         {
 579                         rr->length = 0;
 580                         s->packet_length = 0;
 581                         goto again;
 582                         }
 583
 584                 /* now n == rr->length,
 585                  * and s->packet_length == DTLS1_RT_HEADER_LENGTH + rr->length */
 586                 }
 587         s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
 588
 589         /* match epochs.  NULL means the packet is dropped on the floor */
 590         bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch);
 591         if ( bitmap == NULL)
 592         {
 593         rr->length = 0;
 594         s->packet_length = 0;  /* dump this record */
 595         goto again;   /* get another record */
 596                 }
 597
 598         /* Check whether this is a repeat, or aged record.
 599          * Don't check if we're listening and this message is
 600          * a ClientHello. They can look as if they're replayed,
 601          * since they arrive from different connections and
 602          * would be dropped unnecessarily.
 603          */
 604         if (!(s->d1->listen && rr->type == SSL3_RT_HANDSHAKE &&
 605                 *p == SSL3_MT_CLIENT_HELLO) &&
 606                 ! dtls1_record_replay_check(s, bitmap, &(rr->seq_num)))
 607                 {
 608                 rr->length = 0;
 609                 s->packet_length=0; /* dump this record */
 610                 goto again;     /* get another record */
 611                 }
 612
 613         /* just read a 0 length packet */
 614         if (rr->length == 0) goto again;
 615
 616         /* If this record is from the next epoch (either HM or ALERT),
 617          * and a handshake is currently in progress, buffer it since it
 618          * cannot be processed at this time. */
 619         if (is_next_epoch)
 620                 {
 621                 if (SSL_in_init(s) || s->in_handshake)
 622                         {
 623                         dtls1_buffer_record(s, &(s->d1->unprocessed_rcds), &rr->seq_num);
 624                         }
 625                 rr->length = 0;
 626         s->packet_length = 0;
 627         goto again;
 628         }
 629
 630     if (!dtls1_process_record(s))
 631                 {
 632                 rr->length = 0;
 633                 s->packet_length=0; /* dump this record */
 634                 goto again;     /* get another record */
 635                 }
 636
 637         dtls1_clear_timeouts(s);  /* done waiting */
 638         return(1);
 639
 640         }
 641
 642 /* Return up to 'len' payload bytes received in 'type' records.
 643  * 'type' is one of the following:
 644  *
 645  *   -  SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
 646  *   -  SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
 647  *   -  0 (during a shutdown, no data has to be returned)
 648  *
 649  * If we don't have stored data to work from, read a SSL/TLS record first
 650  * (possibly multiple records if we still don't have anything to return).
 651  *
 652  * This function must handle any surprises the peer may have for us, such as
 653  * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
 654  * a surprise, but handled as if it were), or renegotiation requests.
 655  * Also if record payloads contain fragments too small to process, we store
 656  * them until there is enough for the respective protocol (the record protocol
 657  * may use arbitrary fragmentation and even interleaving):
 658  *     Change cipher spec protocol
 659  *             just 1 byte needed, no need for keeping anything stored
 660  *     Alert protocol
 661  *             2 bytes needed (AlertLevel, AlertDescription)
 662  *     Handshake protocol
 663  *             4 bytes needed (HandshakeType, uint24 length) -- we just have
 664  *             to detect unexpected Client Hello and Hello Request messages
 665  *             here, anything else is handled by higher layers
 666  *     Application data protocol
 667  *             none of our business
 668  */
 669 int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
 670         {
 671         int al,i,j,ret;
 672         unsigned int n;
 673         SSL3_RECORD *rr;
 674         void (*cb)(const SSL *ssl,int type2,int val)=NULL;
 675
 676         if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
 677                 if (!ssl3_setup_buffers(s))
 678                         return(-1);
 679
 680     /* XXX: check what the second '&& type' is about */
 681         if ((type && (type != SSL3_RT_APPLICATION_DATA) &&
 682                 (type != SSL3_RT_HANDSHAKE) && type) ||
 683             (peek && (type != SSL3_RT_APPLICATION_DATA)))
 684                 {
 685                 SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
 686                 return -1;
 687                 }
 688
 689         /* check whether there's a handshake message (client hello?) waiting */
 690         if ( (ret = have_handshake_fragment(s, type, buf, len, peek)))
 691                 return ret;
 692
 693         /* Now s->d1->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
 694
 695         if (!s->in_handshake && SSL_in_init(s))
 696                 {
 697                 /* type == SSL3_RT_APPLICATION_DATA */
 698                 i=s->handshake_func(s);
 699                 if (i < 0) return(i);
 700                 if (i == 0)
 701                         {
 702                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 703                         return(-1);
 704                         }
 705                 }
 706
 707 start:
 708         s->rwstate=SSL_NOTHING;
 709
 710         /* s->s3->rrec.type         - is the type of record
 711          * s->s3->rrec.data,    - data
 712          * s->s3->rrec.off,     - offset into 'data' for next read
 713          * s->s3->rrec.length,  - number of bytes. */
 714         rr = &(s->s3->rrec);
 715
 716         /* We are not handshaking and have no data yet,
 717          * so process data buffered during the last handshake
 718          * in advance, if any.
 719          */
 720         if (s->state == SSL_ST_OK && rr->length == 0)
 721                 {
 722                 pitem *item;
 723                 item = pqueue_pop(s->d1->buffered_app_data.q);
 724                 if (item)
 725                         {
 726                         dtls1_copy_record(s, item);
 727
 728                         OPENSSL_free(item->data);
 729                         pitem_free(item);
 730                         }
 731                 }
 732
 733         /* Check for timeout */
 734         if (dtls1_handle_timeout(s) > 0)
 735                 goto start;
 736
 737         /* get new packet if necessary */
 738         if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
 739                 {
 740                 ret=dtls1_get_record(s);
 741                 if (ret <= 0)
 742                         {
 743                         ret = dtls1_read_failed(s, ret);
 744                         /* anything other than a timeout is an error */
 745                         if (ret <= 0)
 746                                 return(ret);
 747                         else
 748                                 goto start;
 749                         }
 750                 }
 751
 752         /* we now have a packet which can be read and processed */
 753
 754         if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
 755                                        * reset by ssl3_get_finished */
 756                 && (rr->type != SSL3_RT_HANDSHAKE))
 757                 {
 758                 /* We now have application data between CCS and Finished.
 759                  * Most likely the packets were reordered on their way, so
 760                  * buffer the application data for later processing rather
 761                  * than dropping the connection.
 762                  */
 763                 dtls1_buffer_record(s, &(s->d1->buffered_app_data), &rr->seq_num);
 764                 rr->length = 0;
 765                 goto start;
 766                 }
 767
 768         /* If the other end has shut down, throw anything we read away
 769          * (even in 'peek' mode) */
 770         if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
 771                 {
 772                 rr->length=0;
 773                 s->rwstate=SSL_NOTHING;
 774                 return(0);
 775                 }
 776
 777
 778         if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
 779                 {
 780                 /* make sure that we are not getting application data when we
 781                  * are doing a handshake for the first time */
 782                 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
 783                         (s->enc_read_ctx == NULL))
 784                         {
 785                         al=SSL_AD_UNEXPECTED_MESSAGE;
 786                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
 787                         goto f_err;
 788                         }
 789
 790                 if (len <= 0) return(len);
 791
 792                 if ((unsigned int)len > rr->length)
 793                         n = rr->length;
 794                 else
 795                         n = (unsigned int)len;
 796
 797                 memcpy(buf,&(rr->data[rr->off]),n);
 798                 if (!peek)
 799                         {
 800                         rr->length-=n;
 801                         rr->off+=n;
 802                         if (rr->length == 0)
 803                                 {
 804                                 s->rstate=SSL_ST_READ_HEADER;
 805                                 rr->off=0;
 806                                 }
 807                         }
 808                 return(n);
 809                 }
 810
 811
 812         /* If we get here, then type != rr->type; if we have a handshake
 813          * message, then it was unexpected (Hello Request or Client Hello). */
 814
 815         /* In case of record types for which we have 'fragment' storage,
 816          * fill that so that we can process the data at a fixed place.
 817          */
 818                 {
 819                 unsigned int k, dest_maxlen = 0;
 820                 unsigned char *dest = NULL;
 821                 unsigned int *dest_len = NULL;
 822
 823                 if (rr->type == SSL3_RT_HANDSHAKE)
 824                         {
 825                         dest_maxlen = sizeof s->d1->handshake_fragment;
 826                         dest = s->d1->handshake_fragment;
 827                         dest_len = &s->d1->handshake_fragment_len;
 828                         }
 829                 else if (rr->type == SSL3_RT_ALERT)
 830                         {
 831                         dest_maxlen = sizeof(s->d1->alert_fragment);
 832                         dest = s->d1->alert_fragment;
 833                         dest_len = &s->d1->alert_fragment_len;
 834                         }
 835                 /* else it's a CCS message, or application data or wrong */
 836                 else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC)
 837                         {
 838                         /* Application data while renegotiating
 839                          * is allowed. Try again reading.
 840                          */
 841                         if (rr->type == SSL3_RT_APPLICATION_DATA)
 842                                 {
 843                                 BIO *bio;
 844                                 s->s3->in_read_app_data=2;
 845                                 bio=SSL_get_rbio(s);
 846                                 s->rwstate=SSL_READING;
 847                                 BIO_clear_retry_flags(bio);
 848                                 BIO_set_retry_read(bio);
 849                                 return(-1);
 850                                 }
 851
 852                         /* Not certain if this is the right error handling */
 853                         al=SSL_AD_UNEXPECTED_MESSAGE;
 854                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
 855                         goto f_err;
 856                         }
 857
 858                 if (dest_maxlen > 0)
 859                         {
 860             /* XDTLS:  In a pathalogical case, the Client Hello
 861              *  may be fragmented--don't always expect dest_maxlen bytes */
 862                         if ( rr->length < dest_maxlen)
 863                                 {
 864 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
 865                                 /*
 866                                  * for normal alerts rr->length is 2, while
 867                                  * dest_maxlen is 7 if we were to handle this
 868                                  * non-existing alert...
 869                                  */
 870                                 FIX ME
 871 #endif
 872                                 s->rstate=SSL_ST_READ_HEADER;
 873                                 rr->length = 0;
 874                                 goto start;
 875                                 }
 876
 877                         /* now move 'n' bytes: */
 878                         for ( k = 0; k < dest_maxlen; k++)
 879                                 {
 880                                 dest[k] = rr->data[rr->off++];
 881                                 rr->length--;
 882                                 }
 883                         *dest_len = dest_maxlen;
 884                         }
 885                 }
 886
 887         /* s->d1->handshake_fragment_len == 12  iff  rr->type == SSL3_RT_HANDSHAKE;
 888          * s->d1->alert_fragment_len == 7      iff  rr->type == SSL3_RT_ALERT.
 889          * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
 890
 891         /* If we are a client, check for an incoming 'Hello Request': */
 892         if ((!s->server) &&
 893                 (s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
 894                 (s->d1->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
 895                 (s->session != NULL) && (s->session->cipher != NULL))
 896                 {
 897                 s->d1->handshake_fragment_len = 0;
 898
 899                 if ((s->d1->handshake_fragment[1] != 0) ||
 900                         (s->d1->handshake_fragment[2] != 0) ||
 901                         (s->d1->handshake_fragment[3] != 0))
 902                         {
 903                         al=SSL_AD_DECODE_ERROR;
 904                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
 905                         goto err;
 906                         }
 907
 908                 /* no need to check sequence number on HELLO REQUEST messages */
 909
 910                 if (s->msg_callback)
 911                         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
 912                                 s->d1->handshake_fragment, 4, s, s->msg_callback_arg);
 913
 914                 if (SSL_is_init_finished(s) &&
 915                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
 916                         !s->s3->renegotiate)
 917                         {
 918                         ssl3_renegotiate(s);
 919                         if (ssl3_renegotiate_check(s))
 920                                 {
 921                                 i=s->handshake_func(s);
 922                                 if (i < 0) return(i);
 923                                 if (i == 0)
 924                                         {
 925                                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 926                                         return(-1);
 927                                         }
 928
 929                                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
 930                                         {
 931                                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
 932                                                 {
 933                                                 BIO *bio;
 934                                                 /* In the case where we try to read application data,
 935                                                  * but we trigger an SSL handshake, we return -1 with
 936                                                  * the retry option set.  Otherwise renegotiation may
 937                                                  * cause nasty problems in the blocking world */
 938                                                 s->rwstate=SSL_READING;
 939                                                 bio=SSL_get_rbio(s);
 940                                                 BIO_clear_retry_flags(bio);
 941                                                 BIO_set_retry_read(bio);
 942                                                 return(-1);
 943                                                 }
 944                                         }
 945                                 }
 946                         }
 947                 /* we either finished a handshake or ignored the request,
 948                  * now try again to obtain the (application) data we were asked for */
 949                 goto start;
 950                 }
 951
 952         if (s->d1->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH)
 953                 {
 954                 int alert_level = s->d1->alert_fragment[0];
 955                 int alert_descr = s->d1->alert_fragment[1];
 956
 957                 s->d1->alert_fragment_len = 0;
 958
 959                 if (s->msg_callback)
 960                         s->msg_callback(0, s->version, SSL3_RT_ALERT,
 961                                 s->d1->alert_fragment, 2, s, s->msg_callback_arg);
 962
 963                 if (s->info_callback != NULL)
 964                         cb=s->info_callback;
 965                 else if (s->ctx->info_callback != NULL)
 966                         cb=s->ctx->info_callback;
 967
 968                 if (cb != NULL)
 969                         {
 970                         j = (alert_level << 8) | alert_descr;
 971                         cb(s, SSL_CB_READ_ALERT, j);
 972                         }
 973
 974                 if (alert_level == 1) /* warning */
 975                         {
 976                         s->s3->warn_alert = alert_descr;
 977                         if (alert_descr == SSL_AD_CLOSE_NOTIFY)
 978                                 {
 979                                 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
 980                                 return(0);
 981                                 }
 982 #if 0
 983             /* XXX: this is a possible improvement in the future */
 984                         /* now check if it's a missing record */
 985                         if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
 986                                 {
 987                                 unsigned short seq;
 988                                 unsigned int frag_off;
 989                                 unsigned char *p = &(s->d1->alert_fragment[2]);
 990
 991                                 n2s(p, seq);
 992                                 n2l3(p, frag_off);
 993
 994                                 dtls1_retransmit_message(s,
 995                                                                                  dtls1_get_queue_priority(frag->msg_header.seq, 0),
 996                                                                                  frag_off, &found);
 997                                 if ( ! found  && SSL_in_init(s))
 998                                         {
 999                                         /* fprintf( stderr,"in init = %d\n", SSL_in_init(s)); */
1000                                         /* requested a message not yet sent,
1001                                            send an alert ourselves */
1002                                         ssl3_send_alert(s,SSL3_AL_WARNING,
1003                                                 DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
1004                                         }
1005                                 }
1006 #endif
1007                         }
1008                 else if (alert_level == 2) /* fatal */
1009                         {
1010                         char tmp[16];
1011
1012                         s->rwstate=SSL_NOTHING;
1013                         s->s3->fatal_alert = alert_descr;
1014                         SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1015                         BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1016                         ERR_add_error_data(2,"SSL alert number ",tmp);
1017                         s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1018                         SSL_CTX_remove_session(s->ctx,s->session);
1019                         return(0);
1020                         }
1021                 else
1022                         {
1023                         al=SSL_AD_ILLEGAL_PARAMETER;
1024                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1025                         goto f_err;
1026                         }
1027
1028                 goto start;
1029                 }
1030
1031         if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1032                 {
1033                 s->rwstate=SSL_NOTHING;
1034                 rr->length=0;
1035                 return(0);
1036                 }
1037
1038         if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1039                 {
1040                 struct ccs_header_st ccs_hdr;
1041                 unsigned int ccs_hdr_len = DTLS1_CCS_HEADER_LENGTH;
1042
1043                 dtls1_get_ccs_header(rr->data, &ccs_hdr);
1044
1045                 /* 'Change Cipher Spec' is just a single byte, so we know
1046                  * exactly what the record payload has to look like */
1047                 /* XDTLS: check that epoch is consistent */
1048                 if (s->client_version == DTLS1_BAD_VER || s->version == DTLS1_BAD_VER)
1049                         ccs_hdr_len = 3;
1050
1051                 if ((rr->length != ccs_hdr_len) || (rr->off != 0) || (rr->data[0] != SSL3_MT_CCS))
1052                         {
1053                         i=SSL_AD_ILLEGAL_PARAMETER;
1054                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1055                         goto err;
1056                         }
1057
1058                 rr->length=0;
1059
1060                 if (s->msg_callback)
1061                         s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,
1062                                 rr->data, 1, s, s->msg_callback_arg);
1063
1064                 /* We can't process a CCS now, because previous handshake
1065                  * messages are still missing, so just drop it.
1066                  */
1067                 if (!s->d1->change_cipher_spec_ok)
1068                         {
1069                         goto start;
1070                         }
1071
1072                 s->d1->change_cipher_spec_ok = 0;
1073
1074                 s->s3->change_cipher_spec=1;
1075                 if (!ssl3_do_change_cipher_spec(s))
1076                         goto err;
1077
1078                 /* do this whenever CCS is processed */
1079                 dtls1_reset_seq_numbers(s, SSL3_CC_READ);
1080
1081                 if (s->client_version == DTLS1_BAD_VER)
1082                         s->d1->handshake_read_seq++;
1083
1084                 goto start;
1085                 }
1086
1087         /* Unexpected handshake message (Client Hello, or protocol violation) */
1088         if ((s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
1089                 !s->in_handshake)
1090                 {
1091                 struct hm_header_st msg_hdr;
1092
1093                 /* this may just be a stale retransmit */
1094                 dtls1_get_message_header(rr->data, &msg_hdr);
1095                 if( rr->epoch != s->d1->r_epoch)
1096                         {
1097                         rr->length = 0;
1098                         goto start;
1099                         }
1100
1101                 /* If we are server, we may have a repeated FINISHED of the
1102                  * client here, then retransmit our CCS and FINISHED.
1103                  */
1104                 if (msg_hdr.type == SSL3_MT_FINISHED)
1105                         {
1106                         dtls1_retransmit_buffered_messages(s);
1107                         rr->length = 0;
1108                         goto start;
1109                         }
1110
1111                 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1112                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1113                         {
1114 #if 0 /* worked only because C operator preferences are not as expected (and
1115        * because this is not really needed for clients except for detecting
1116        * protocol violations): */
1117                         s->state=SSL_ST_BEFORE|(s->server)
1118                                 ?SSL_ST_ACCEPT
1119                                 :SSL_ST_CONNECT;
1120 #else
1121                         s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1122 #endif
1123                         s->new_session=1;
1124                         }
1125                 i=s->handshake_func(s);
1126                 if (i < 0) return(i);
1127                 if (i == 0)
1128                         {
1129                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1130                         return(-1);
1131                         }
1132
1133                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1134                         {
1135                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1136                                 {
1137                                 BIO *bio;
1138                                 /* In the case where we try to read application data,
1139                                  * but we trigger an SSL handshake, we return -1 with
1140                                  * the retry option set.  Otherwise renegotiation may
1141                                  * cause nasty problems in the blocking world */
1142                                 s->rwstate=SSL_READING;
1143                                 bio=SSL_get_rbio(s);
1144                                 BIO_clear_retry_flags(bio);
1145                                 BIO_set_retry_read(bio);
1146                                 return(-1);
1147                                 }
1148                         }
1149                 goto start;
1150                 }
1151
1152         switch (rr->type)
1153                 {
1154         default:
1155 #ifndef OPENSSL_NO_TLS
1156                 /* TLS just ignores unknown message types */
1157                 if (s->version == TLS1_VERSION)
1158                         {
1159                         rr->length = 0;
1160                         goto start;
1161                         }
1162 #endif
1163                 al=SSL_AD_UNEXPECTED_MESSAGE;
1164                 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1165                 goto f_err;
1166         case SSL3_RT_CHANGE_CIPHER_SPEC:
1167         case SSL3_RT_ALERT:
1168         case SSL3_RT_HANDSHAKE:
1169                 /* we already handled all of these, with the possible exception
1170                  * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1171                  * should not happen when type != rr->type */
1172                 al=SSL_AD_UNEXPECTED_MESSAGE;
1173                 SSLerr(SSL_F_DTLS1_READ_BYTES,ERR_R_INTERNAL_ERROR);
1174                 goto f_err;
1175         case SSL3_RT_APPLICATION_DATA:
1176                 /* At this point, we were expecting handshake data,
1177                  * but have application data.  If the library was
1178                  * running inside ssl3_read() (i.e. in_read_app_data
1179                  * is set) and it makes sense to read application data
1180                  * at this point (session renegotiation not yet started),
1181                  * we will indulge it.
1182                  */
1183                 if (s->s3->in_read_app_data &&
1184                         (s->s3->total_renegotiations != 0) &&
1185                         ((
1186                                 (s->state & SSL_ST_CONNECT) &&
1187                                 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1188                                 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1189                                 ) || (
1190                                         (s->state & SSL_ST_ACCEPT) &&
1191                                         (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1192                                         (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1193                                         )
1194                                 ))
1195                         {
1196                         s->s3->in_read_app_data=2;
1197                         return(-1);
1198                         }
1199                 else
1200                         {
1201                         al=SSL_AD_UNEXPECTED_MESSAGE;
1202                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1203                         goto f_err;
1204                         }
1205                 }
1206         /* not reached */
1207
1208 f_err:
1209         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1210 err:
1211         return(-1);
1212         }
1213
1214 int
1215 dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len)
1216         {
1217         int i;
1218
1219         if (SSL_in_init(s) && !s->in_handshake)
1220                 {
1221                 i=s->handshake_func(s);
1222                 if (i < 0) return(i);
1223                 if (i == 0)
1224                         {
1225                         SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1226                         return -1;
1227                         }
1228                 }
1229
1230         if (len > SSL3_RT_MAX_PLAIN_LENGTH)
1231                 {
1232                         SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_DTLS_MESSAGE_TOO_BIG);
1233                         return -1;
1234                 }
1235
1236         i = dtls1_write_bytes(s, type, buf_, len);
1237         return i;
1238         }
1239
1240
1241         /* this only happens when a client hello is received and a handshake
1242          * is started. */
1243 static int
1244 have_handshake_fragment(SSL *s, int type, unsigned char *buf,
1245         int len, int peek)
1246         {
1247
1248         if ((type == SSL3_RT_HANDSHAKE) && (s->d1->handshake_fragment_len > 0))
1249                 /* (partially) satisfy request from storage */
1250                 {
1251                 unsigned char *src = s->d1->handshake_fragment;
1252                 unsigned char *dst = buf;
1253                 unsigned int k,n;
1254
1255                 /* peek == 0 */
1256                 n = 0;
1257                 while ((len > 0) && (s->d1->handshake_fragment_len > 0))
1258                         {
1259                         *dst++ = *src++;
1260                         len--; s->d1->handshake_fragment_len--;
1261                         n++;
1262                         }
1263                 /* move any remaining fragment bytes: */
1264                 for (k = 0; k < s->d1->handshake_fragment_len; k++)
1265                         s->d1->handshake_fragment[k] = *src++;
1266                 return n;
1267                 }
1268
1269         return 0;
1270         }
1271
1272
1273
1274
1275 /* Call this to write data in records of type 'type'
1276  * It will return <= 0 if not all data has been sent or non-blocking IO.
1277  */
1278 int dtls1_write_bytes(SSL *s, int type, const void *buf, int len)
1279         {
1280         int i;
1281
1282         OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH);
1283         s->rwstate=SSL_NOTHING;
1284         i=do_dtls1_write(s, type, buf, len, 0);
1285         return i;
1286         }
1287
1288 int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len, int create_empty_fragment)
1289         {
1290         unsigned char *p,*pseq;
1291         int i,mac_size,clear=0;
1292         int prefix_len = 0;
1293         SSL3_RECORD *wr;
1294         SSL3_BUFFER *wb;
1295         SSL_SESSION *sess;
1296         int bs;
1297
1298         /* first check if there is a SSL3_BUFFER still being written
1299          * out.  This will happen with non blocking IO */
1300         if (s->s3->wbuf.left != 0)
1301                 {
1302                 OPENSSL_assert(0); /* XDTLS:  want to see if we ever get here */
1303                 return(ssl3_write_pending(s,type,buf,len));
1304                 }
1305
1306         /* If we have an alert to send, lets send it */
1307         if (s->s3->alert_dispatch)
1308                 {
1309                 i=s->method->ssl_dispatch_alert(s);
1310                 if (i <= 0)
1311                         return(i);
1312                 /* if it went, fall through and send more stuff */
1313                 }
1314
1315         if (len == 0 && !create_empty_fragment)
1316                 return 0;
1317
1318         wr= &(s->s3->wrec);
1319         wb= &(s->s3->wbuf);
1320         sess=s->session;
1321
1322         if (    (sess == NULL) ||
1323                 (s->enc_write_ctx == NULL) ||
1324                 (s->write_hash == NULL))
1325                 clear=1;
1326
1327         if (clear)
1328                 mac_size=0;
1329         else
1330                 mac_size=EVP_MD_size(s->write_hash);
1331
1332         /* DTLS implements explicit IV, so no need for empty fragments */
1333 #if 0
1334         /* 'create_empty_fragment' is true only when this function calls itself */
1335         if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done
1336             && SSL_version(s) != DTLS1_VERSION && SSL_version(s) != DTLS1_BAD_VER)
1337                 {
1338                 /* countermeasure against known-IV weakness in CBC ciphersuites
1339                  * (see http://www.openssl.org/~bodo/tls-cbc.txt)
1340                  */
1341
1342                 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
1343                         {
1344                         /* recursive function call with 'create_empty_fragment' set;
1345                          * this prepares and buffers the data for an empty fragment
1346                          * (these 'prefix_len' bytes are sent out later
1347                          * together with the actual payload) */
1348                         prefix_len = s->method->do_ssl_write(s, type, buf, 0, 1);
1349                         if (prefix_len <= 0)
1350                                 goto err;
1351
1352                         if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE)
1353                                 {
1354                                 /* insufficient space */
1355                                 SSLerr(SSL_F_DO_DTLS1_WRITE, ERR_R_INTERNAL_ERROR);
1356                                 goto err;
1357                                 }
1358                         }
1359
1360                 s->s3->empty_fragment_done = 1;
1361                 }
1362 #endif
1363
1364         p = wb->buf + prefix_len;
1365
1366         /* write the header */
1367
1368         *(p++)=type&0xff;
1369         wr->type=type;
1370
1371         if (s->client_version == DTLS1_BAD_VER)
1372                 *(p++) = DTLS1_BAD_VER>>8,
1373                 *(p++) = DTLS1_BAD_VER&0xff;
1374         else
1375                 *(p++)=(s->version>>8),
1376                 *(p++)=s->version&0xff;
1377
1378         /* field where we are to write out packet epoch, seq num and len */
1379         pseq=p;
1380         p+=10;
1381
1382         /* lets setup the record stuff. */
1383
1384         /* Make space for the explicit IV in case of CBC.
1385          * (this is a bit of a boundary violation, but what the heck).
1386          */
1387         if ( s->enc_write_ctx &&
1388                 (EVP_CIPHER_mode( s->enc_write_ctx->cipher ) & EVP_CIPH_CBC_MODE))
1389                 bs = EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
1390         else
1391                 bs = 0;
1392
1393         wr->data=p + bs;  /* make room for IV in case of CBC */
1394         wr->length=(int)len;
1395         wr->input=(unsigned char *)buf;
1396
1397         /* we now 'read' from wr->input, wr->length bytes into
1398          * wr->data */
1399
1400         /* first we compress */
1401         if (s->compress != NULL)
1402                 {
1403                 if (!ssl3_do_compress(s))
1404                         {
1405                         SSLerr(SSL_F_DO_DTLS1_WRITE,SSL_R_COMPRESSION_FAILURE);
1406                         goto err;
1407                         }
1408                 }
1409         else
1410                 {
1411                 memcpy(wr->data,wr->input,wr->length);
1412                 wr->input=wr->data;
1413                 }
1414
1415         /* we should still have the output to wr->data and the input
1416          * from wr->input.  Length should be wr->length.
1417          * wr->data still points in the wb->buf */
1418
1419         if (mac_size != 0)
1420                 {
1421                 s->method->ssl3_enc->mac(s,&(p[wr->length + bs]),1);
1422                 wr->length+=mac_size;
1423                 }
1424
1425         /* this is true regardless of mac size */
1426         wr->input=p;
1427         wr->data=p;
1428
1429
1430         /* ssl3_enc can only have an error on read */
1431         if (bs) /* bs != 0 in case of CBC */
1432                 {
1433                 RAND_pseudo_bytes(p,bs);
1434                 /* master IV and last CBC residue stand for
1435                  * the rest of randomness */
1436                 wr->length += bs;
1437                 }
1438
1439         s->method->ssl3_enc->enc(s,1);
1440
1441         /* record length after mac and block padding */
1442 /*      if (type == SSL3_RT_APPLICATION_DATA ||
1443         (type == SSL3_RT_ALERT && ! SSL_in_init(s))) */
1444
1445         /* there's only one epoch between handshake and app data */
1446
1447         s2n(s->d1->w_epoch, pseq);
1448
1449         /* XDTLS: ?? */
1450 /*      else
1451         s2n(s->d1->handshake_epoch, pseq); */
1452
1453         memcpy(pseq, &(s->s3->write_sequence[2]), 6);
1454         pseq+=6;
1455         s2n(wr->length,pseq);
1456
1457         /* we should now have
1458          * wr->data pointing to the encrypted data, which is
1459          * wr->length long */
1460         wr->type=type; /* not needed but helps for debugging */
1461         wr->length+=DTLS1_RT_HEADER_LENGTH;
1462
1463 #if 0  /* this is now done at the message layer */
1464         /* buffer the record, making it easy to handle retransmits */
1465         if ( type == SSL3_RT_HANDSHAKE || type == SSL3_RT_CHANGE_CIPHER_SPEC)
1466                 dtls1_buffer_record(s, wr->data, wr->length,
1467                         *((PQ_64BIT *)&(s->s3->write_sequence[0])));
1468 #endif
1469
1470         ssl3_record_sequence_update(&(s->s3->write_sequence[0]));
1471
1472         if (create_empty_fragment)
1473                 {
1474                 /* we are in a recursive call;
1475                  * just return the length, don't write out anything here
1476                  */
1477                 return wr->length;
1478                 }
1479
1480         /* now let's set up wb */
1481         wb->left = prefix_len + wr->length;
1482         wb->offset = 0;
1483
1484         /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
1485         s->s3->wpend_tot=len;
1486         s->s3->wpend_buf=buf;
1487         s->s3->wpend_type=type;
1488         s->s3->wpend_ret=len;
1489
1490         /* we now just need to write the buffer */
1491         return ssl3_write_pending(s,type,buf,len);
1492 err:
1493         return -1;
1494         }
1495
1496
1497
1498 static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap,
1499         PQ_64BIT *seq_num)
1500         {
1501 #if PQ_64BIT_IS_INTEGER
1502         PQ_64BIT mask = 0x0000000000000001L;
1503 #endif
1504         PQ_64BIT rcd_num, tmp;
1505
1506         pq_64bit_init(&rcd_num);
1507         pq_64bit_init(&tmp);
1508
1509         /* this is the sequence number for the record just read */
1510         pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8);
1511
1512
1513         if (pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) ||
1514                 pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num)))
1515                 {
1516                 pq_64bit_assign(seq_num, &rcd_num);
1517                 pq_64bit_free(&rcd_num);
1518                 pq_64bit_free(&tmp);
1519                 return 1;  /* this record is new */
1520                 }
1521
1522         pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
1523
1524         if ( pq_64bit_get_word(&tmp) > bitmap->length)
1525                 {
1526                 pq_64bit_free(&rcd_num);
1527                 pq_64bit_free(&tmp);
1528                 return 0;  /* stale, outside the window */
1529                 }
1530
1531 #if PQ_64BIT_IS_BIGNUM
1532         {
1533         int offset;
1534         pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
1535         pq_64bit_sub_word(&tmp, 1);
1536         offset = pq_64bit_get_word(&tmp);
1537         if ( pq_64bit_is_bit_set(&(bitmap->map), offset))
1538                 {
1539                 pq_64bit_free(&rcd_num);
1540                 pq_64bit_free(&tmp);
1541                 return 0;
1542                 }
1543         }
1544 #else
1545         mask <<= (bitmap->max_seq_num - rcd_num - 1);
1546         if (bitmap->map & mask)
1547                 return 0; /* record previously received */
1548 #endif
1549
1550         pq_64bit_assign(seq_num, &rcd_num);
1551         pq_64bit_free(&rcd_num);
1552         pq_64bit_free(&tmp);
1553         return 1;
1554         }
1555
1556
1557 static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap)
1558         {
1559         unsigned int shift;
1560         PQ_64BIT rcd_num;
1561         PQ_64BIT tmp;
1562         PQ_64BIT_CTX *ctx;
1563
1564         pq_64bit_init(&rcd_num);
1565         pq_64bit_init(&tmp);
1566
1567         pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8);
1568
1569         /* unfortunate code complexity due to 64-bit manipulation support
1570          * on 32-bit machines */
1571         if ( pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) ||
1572                 pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num)))
1573                 {
1574                 pq_64bit_sub(&tmp, &rcd_num, &(bitmap->max_seq_num));
1575                 pq_64bit_add_word(&tmp, 1);
1576
1577                 shift = (unsigned int)pq_64bit_get_word(&tmp);
1578
1579                 pq_64bit_lshift(&(tmp), &(bitmap->map), shift);
1580                 pq_64bit_assign(&(bitmap->map), &tmp);
1581
1582                 pq_64bit_set_bit(&(bitmap->map), 0);
1583                 pq_64bit_add_word(&rcd_num, 1);
1584                 pq_64bit_assign(&(bitmap->max_seq_num), &rcd_num);
1585
1586                 pq_64bit_assign_word(&tmp, 1);
1587                 pq_64bit_lshift(&tmp, &tmp, bitmap->length);
1588                 ctx = pq_64bit_ctx_new(&ctx);
1589                 pq_64bit_mod(&(bitmap->map), &(bitmap->map), &tmp, ctx);
1590                 pq_64bit_ctx_free(ctx);
1591                 }
1592         else
1593                 {
1594                 pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
1595                 pq_64bit_sub_word(&tmp, 1);
1596                 shift = (unsigned int)pq_64bit_get_word(&tmp);
1597
1598                 pq_64bit_set_bit(&(bitmap->map), shift);
1599                 }
1600
1601         pq_64bit_free(&rcd_num);
1602         pq_64bit_free(&tmp);
1603         }
1604
1605
1606 int dtls1_dispatch_alert(SSL *s)
1607         {
1608         int i,j;
1609         void (*cb)(const SSL *ssl,int type,int val)=NULL;
1610         unsigned char buf[DTLS1_AL_HEADER_LENGTH];
1611         unsigned char *ptr = &buf[0];
1612
1613         s->s3->alert_dispatch=0;
1614
1615         memset(buf, 0x00, sizeof(buf));
1616         *ptr++ = s->s3->send_alert[0];
1617         *ptr++ = s->s3->send_alert[1];
1618
1619 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1620         if (s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
1621                 {
1622                 s2n(s->d1->handshake_read_seq, ptr);
1623 #if 0
1624                 if ( s->d1->r_msg_hdr.frag_off == 0)  /* waiting for a new msg */
1625
1626                 else
1627                         s2n(s->d1->r_msg_hdr.seq, ptr); /* partial msg read */
1628 #endif
1629
1630 #if 0
1631                 fprintf(stderr, "s->d1->handshake_read_seq = %d, s->d1->r_msg_hdr.seq = %d\n",s->d1->handshake_read_seq,s->d1->r_msg_hdr.seq);
1632 #endif
1633                 l2n3(s->d1->r_msg_hdr.frag_off, ptr);
1634                 }
1635 #endif
1636
1637         i = do_dtls1_write(s, SSL3_RT_ALERT, &buf[0], sizeof(buf), 0);
1638         if (i <= 0)
1639                 {
1640                 s->s3->alert_dispatch=1;
1641                 /* fprintf( stderr, "not done with alert\n" ); */
1642                 }
1643         else
1644                 {
1645                 if (s->s3->send_alert[0] == SSL3_AL_FATAL
1646 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1647                     || s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1648 #endif
1649                    )
1650                         (void)BIO_flush(s->wbio);
1651
1652                 if (s->msg_callback)
1653                         s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert,
1654                                 2, s, s->msg_callback_arg);
1655
1656                 if (s->info_callback != NULL)
1657                         cb=s->info_callback;
1658                 else if (s->ctx->info_callback != NULL)
1659                         cb=s->ctx->info_callback;
1660
1661                 if (cb != NULL)
1662                         {
1663                         j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1664                         cb(s,SSL_CB_WRITE_ALERT,j);
1665                         }
1666                 }
1667         return(i);
1668         }
1669
1670
1671 static DTLS1_BITMAP *
1672 dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, unsigned int *is_next_epoch)
1673     {
1674
1675     *is_next_epoch = 0;
1676
1677     /* In current epoch, accept HM, CCS, DATA, & ALERT */
1678     if (rr->epoch == s->d1->r_epoch)
1679         return &s->d1->bitmap;
1680
1681     /* Only HM and ALERT messages can be from the next epoch */
1682     else if (rr->epoch == (unsigned long)(s->d1->r_epoch + 1) &&
1683         (rr->type == SSL3_RT_HANDSHAKE ||
1684             rr->type == SSL3_RT_ALERT))
1685         {
1686         *is_next_epoch = 1;
1687         return &s->d1->next_bitmap;
1688         }
1689
1690     return NULL;
1691     }
1692
1693 #if 0
1694 static int
1695 dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, unsigned short *priority,
1696         unsigned long *offset)
1697         {
1698
1699         /* alerts are passed up immediately */
1700         if ( rr->type == SSL3_RT_APPLICATION_DATA ||
1701                 rr->type == SSL3_RT_ALERT)
1702                 return 0;
1703
1704         /* Only need to buffer if a handshake is underway.
1705          * (this implies that Hello Request and Client Hello are passed up
1706          * immediately) */
1707         if ( SSL_in_init(s))
1708                 {
1709                 unsigned char *data = rr->data;
1710                 /* need to extract the HM/CCS sequence number here */
1711                 if ( rr->type == SSL3_RT_HANDSHAKE ||
1712                         rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1713                         {
1714                         unsigned short seq_num;
1715                         struct hm_header_st msg_hdr;
1716                         struct ccs_header_st ccs_hdr;
1717
1718                         if ( rr->type == SSL3_RT_HANDSHAKE)
1719                                 {
1720                                 dtls1_get_message_header(data, &msg_hdr);
1721                                 seq_num = msg_hdr.seq;
1722                                 *offset = msg_hdr.frag_off;
1723                                 }
1724                         else
1725                                 {
1726                                 dtls1_get_ccs_header(data, &ccs_hdr);
1727                                 seq_num = ccs_hdr.seq;
1728                                 *offset = 0;
1729                                 }
1730
1731                         /* this is either a record we're waiting for, or a
1732                          * retransmit of something we happened to previously
1733                          * receive (higher layers will drop the repeat silently */
1734                         if ( seq_num < s->d1->handshake_read_seq)
1735                                 return 0;
1736                         if (rr->type == SSL3_RT_HANDSHAKE &&
1737                                 seq_num == s->d1->handshake_read_seq &&
1738                                 msg_hdr.frag_off < s->d1->r_msg_hdr.frag_off)
1739                                 return 0;
1740                         else if ( seq_num == s->d1->handshake_read_seq &&
1741                                 (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC ||
1742                                         msg_hdr.frag_off == s->d1->r_msg_hdr.frag_off))
1743                                 return 0;
1744                         else
1745                                 {
1746                                 *priority = seq_num;
1747                                 return 1;
1748                                 }
1749                         }
1750                 else /* unknown record type */
1751                         return 0;
1752                 }
1753
1754         return 0;
1755         }
1756 #endif
1757
1758 void
1759 dtls1_reset_seq_numbers(SSL *s, int rw)
1760         {
1761         unsigned char *seq;
1762         unsigned int seq_bytes = sizeof(s->s3->read_sequence);
1763
1764         if ( rw & SSL3_CC_READ)
1765                 {
1766                 seq = s->s3->read_sequence;
1767                 s->d1->r_epoch++;
1768
1769                 pq_64bit_assign(&(s->d1->bitmap.map), &(s->d1->next_bitmap.map));
1770                 s->d1->bitmap.length = s->d1->next_bitmap.length;
1771                 pq_64bit_assign(&(s->d1->bitmap.max_seq_num),
1772                         &(s->d1->next_bitmap.max_seq_num));
1773
1774                 pq_64bit_free(&(s->d1->next_bitmap.map));
1775                 pq_64bit_free(&(s->d1->next_bitmap.max_seq_num));
1776                 memset(&(s->d1->next_bitmap), 0x00, sizeof(DTLS1_BITMAP));
1777                 pq_64bit_init(&(s->d1->next_bitmap.map));
1778                 pq_64bit_init(&(s->d1->next_bitmap.max_seq_num));
1779                 }
1780         else
1781                 {
1782                 seq = s->s3->write_sequence;
1783                 memcpy(s->d1->last_write_sequence, seq, sizeof(s->s3->write_sequence));
1784                 s->d1->w_epoch++;
1785                 }
1786
1787         memset(seq, 0x00, seq_bytes);
1788         }
1789
1790 #if PQ_64BIT_IS_INTEGER
1791 static PQ_64BIT
1792 bytes_to_long_long(unsigned char *bytes, PQ_64BIT *num)
1793        {
1794        PQ_64BIT _num;
1795
1796        _num = (((PQ_64BIT)bytes[0]) << 56) |
1797                (((PQ_64BIT)bytes[1]) << 48) |
1798                (((PQ_64BIT)bytes[2]) << 40) |
1799                (((PQ_64BIT)bytes[3]) << 32) |
1800                (((PQ_64BIT)bytes[4]) << 24) |
1801                (((PQ_64BIT)bytes[5]) << 16) |
1802                (((PQ_64BIT)bytes[6]) <<  8) |
1803                (((PQ_64BIT)bytes[7])      );
1804
1805            *num = _num ;
1806        return _num;
1807        }
1808 #endif
1809
1810
1811 static void
1812 dtls1_clear_timeouts(SSL *s)
1813         {
1814         memset(&(s->d1->timeout), 0x00, sizeof(struct dtls1_timeout_st));
1815         }