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     return(1);
 161     }
 162
 163
 164 static int
 165 dtls1_buffer_record(SSL *s, record_pqueue *queue, PQ_64BIT priority)
 166 {
 167     DTLS1_RECORD_DATA *rdata;
 168         pitem *item;
 169
 170         /* Limit the size of the queue to prevent DOS attacks */
 171         if (pqueue_size(queue->q) >= 100)
 172                 return 0;
 173
 174         rdata = OPENSSL_malloc(sizeof(DTLS1_RECORD_DATA));
 175         item = pitem_new(priority, rdata);
 176         if (rdata == NULL || item == NULL)
 177                 {
 178                 if (rdata != NULL) OPENSSL_free(rdata);
 179                 if (item != NULL) pitem_free(item);
 180
 181                 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
 182                 return(0);
 183                 }
 184
 185         rdata->packet = s->packet;
 186         rdata->packet_length = s->packet_length;
 187         memcpy(&(rdata->rbuf), &(s->s3->rbuf), sizeof(SSL3_BUFFER));
 188         memcpy(&(rdata->rrec), &(s->s3->rrec), sizeof(SSL3_RECORD));
 189
 190         item->data = rdata;
 191
 192         /* insert should not fail, since duplicates are dropped */
 193         if (pqueue_insert(queue->q, item) == NULL)
 194                 {
 195                 OPENSSL_free(rdata);
 196                 pitem_free(item);
 197                 return(0);
 198                 }
 199
 200         s->packet = NULL;
 201         s->packet_length = 0;
 202         memset(&(s->s3->rbuf), 0, sizeof(SSL3_BUFFER));
 203         memset(&(s->s3->rrec), 0, sizeof(SSL3_RECORD));
 204
 205         if (!ssl3_setup_buffers(s))
 206                 {
 207                 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
 208                 OPENSSL_free(rdata);
 209                 pitem_free(item);
 210                 return(0);
 211                 }
 212
 213         return(1);
 214     }
 215
 216
 217 static int
 218 dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue)
 219     {
 220     pitem *item;
 221
 222     item = pqueue_pop(queue->q);
 223     if (item)
 224         {
 225         dtls1_copy_record(s, item);
 226
 227         OPENSSL_free(item->data);
 228                 pitem_free(item);
 229
 230         return(1);
 231         }
 232
 233     return(0);
 234     }
 235
 236
 237 /* retrieve a buffered record that belongs to the new epoch, i.e., not processed
 238  * yet */
 239 #define dtls1_get_unprocessed_record(s) \
 240                    dtls1_retrieve_buffered_record((s), \
 241                    &((s)->d1->unprocessed_rcds))
 242
 243 /* retrieve a buffered record that belongs to the current epoch, ie, processed */
 244 #define dtls1_get_processed_record(s) \
 245                    dtls1_retrieve_buffered_record((s), \
 246                    &((s)->d1->processed_rcds))
 247
 248 static int
 249 dtls1_process_buffered_records(SSL *s)
 250     {
 251     pitem *item;
 252
 253     item = pqueue_peek(s->d1->unprocessed_rcds.q);
 254     if (item)
 255         {
 256         DTLS1_RECORD_DATA *rdata;
 257         rdata = (DTLS1_RECORD_DATA *)item->data;
 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 i,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 decryption_failed_or_bad_record_mac;
 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 decryption_failed_or_bad_record_mac;
 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 decryption_failed_or_bad_record_mac;
 415 #endif
 416                         }
 417                 rr->length-=mac_size;
 418                 i=s->method->ssl3_enc->mac(s,md,0);
 419                 if (memcmp(md,&(rr->data[rr->length]),mac_size) != 0)
 420                         {
 421                         goto decryption_failed_or_bad_record_mac;
 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 decryption_failed_or_bad_record_mac:
 464         /* Separate 'decryption_failed' alert was introduced with TLS 1.0,
 465          * SSL 3.0 only has 'bad_record_mac'.  But unless a decryption
 466          * failure is directly visible from the ciphertext anyway,
 467          * we should not reveal which kind of error occured -- this
 468          * might become visible to an attacker (e.g. via logfile) */
 469         al=SSL_AD_BAD_RECORD_MAC;
 470         SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
 471 f_err:
 472         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 473 err:
 474         return(0);
 475 }
 476
 477
 478 /* Call this to get a new input record.
 479  * It will return <= 0 if more data is needed, normally due to an error
 480  * or non-blocking IO.
 481  * When it finishes, one packet has been decoded and can be found in
 482  * ssl->s3->rrec.type    - is the type of record
 483  * ssl->s3->rrec.data,   - data
 484  * ssl->s3->rrec.length, - number of bytes
 485  */
 486 /* used only by dtls1_read_bytes */
 487 int dtls1_get_record(SSL *s)
 488         {
 489         int ssl_major,ssl_minor,al;
 490         int i,n;
 491         SSL3_RECORD *rr;
 492         SSL_SESSION *sess;
 493         unsigned char *p;
 494         unsigned short version;
 495         DTLS1_BITMAP *bitmap;
 496         unsigned int is_next_epoch;
 497
 498         rr= &(s->s3->rrec);
 499         sess=s->session;
 500
 501     /* The epoch may have changed.  If so, process all the
 502      * pending records.  This is a non-blocking operation. */
 503     if ( ! dtls1_process_buffered_records(s))
 504         return 0;
 505
 506         /* if we're renegotiating, then there may be buffered records */
 507         if (dtls1_get_processed_record(s))
 508                 return 1;
 509
 510         /* get something from the wire */
 511 again:
 512         /* check if we have the header */
 513         if (    (s->rstate != SSL_ST_READ_BODY) ||
 514                 (s->packet_length < DTLS1_RT_HEADER_LENGTH))
 515                 {
 516                 n=ssl3_read_n(s, DTLS1_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
 517                 /* read timeout is handled by dtls1_read_bytes */
 518                 if (n <= 0) return(n); /* error or non-blocking */
 519
 520                 OPENSSL_assert(s->packet_length == DTLS1_RT_HEADER_LENGTH);
 521
 522                 s->rstate=SSL_ST_READ_BODY;
 523
 524                 p=s->packet;
 525
 526                 /* Pull apart the header into the DTLS1_RECORD */
 527                 rr->type= *(p++);
 528                 ssl_major= *(p++);
 529                 ssl_minor= *(p++);
 530                 version=(ssl_major<<8)|ssl_minor;
 531
 532                 /* sequence number is 64 bits, with top 2 bytes = epoch */
 533                 n2s(p,rr->epoch);
 534
 535                 memcpy(&(s->s3->read_sequence[2]), p, 6);
 536                 p+=6;
 537
 538                 n2s(p,rr->length);
 539
 540                 /* Lets check version */
 541                 if (!s->first_packet)
 542                         {
 543                         if (version != s->version && version != DTLS1_BAD_VER)
 544                                 {
 545                                 /* unexpected version, silently discard */
 546                                 rr->length = 0;
 547                                 s->packet_length = 0;
 548                                 goto again;
 549                                 }
 550                         }
 551
 552                 if ((version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
 553                     (version & 0xff00) != (DTLS1_BAD_VER & 0xff00))
 554                         {
 555                         /* wrong version, silently discard record */
 556                         rr->length = 0;
 557                         s->packet_length = 0;
 558                         goto again;
 559                         }
 560
 561                 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
 562                         {
 563                         /* record too long, silently discard it */
 564                         rr->length = 0;
 565                         s->packet_length = 0;
 566                         goto again;
 567                         }
 568
 569                 s->client_version = version;
 570                 /* now s->rstate == SSL_ST_READ_BODY */
 571                 }
 572
 573         /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
 574
 575         if (rr->length > s->packet_length-DTLS1_RT_HEADER_LENGTH)
 576                 {
 577                 /* now s->packet_length == DTLS1_RT_HEADER_LENGTH */
 578                 i=rr->length;
 579                 n=ssl3_read_n(s,i,i,1);
 580                 if (n <= 0) return(n); /* error or non-blocking io */
 581
 582                 /* this packet contained a partial record, dump it */
 583                 if ( n != i)
 584                         {
 585                         rr->length = 0;
 586                         s->packet_length = 0;
 587                         goto again;
 588                         }
 589
 590                 /* now n == rr->length,
 591                  * and s->packet_length == DTLS1_RT_HEADER_LENGTH + rr->length */
 592                 }
 593         s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
 594
 595         /* match epochs.  NULL means the packet is dropped on the floor */
 596         bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch);
 597         if ( bitmap == NULL)
 598         {
 599         rr->length = 0;
 600         s->packet_length = 0;  /* dump this record */
 601         goto again;   /* get another record */
 602                 }
 603
 604         /* check whether this is a repeat, or aged record */
 605         if ( ! dtls1_record_replay_check(s, bitmap, &(rr->seq_num)))
 606                 {
 607                 rr->length = 0;
 608                 s->packet_length=0; /* dump this record */
 609                 goto again;     /* get another record */
 610                 }
 611
 612         /* just read a 0 length packet */
 613         if (rr->length == 0) goto again;
 614
 615     /* If this record is from the next epoch (either HM or ALERT), buffer it
 616      * since it cannot be processed at this time.
 617      * Records from the next epoch are marked as received even though they are
 618      * not processed, so as to prevent any potential resource DoS attack */
 619     if (is_next_epoch)
 620         {
 621         dtls1_record_bitmap_update(s, bitmap);
 622         dtls1_buffer_record(s, &(s->d1->unprocessed_rcds), rr->seq_num);
 623         rr->length = 0;
 624         s->packet_length = 0;
 625         goto again;
 626         }
 627
 628     if ( ! dtls1_process_record(s))
 629         return(0);
 630
 631         dtls1_clear_timeouts(s);  /* done waiting */
 632         return(1);
 633
 634 f_err:
 635         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 636 err:
 637         return(0);
 638         }
 639
 640 /* Return up to 'len' payload bytes received in 'type' records.
 641  * 'type' is one of the following:
 642  *
 643  *   -  SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
 644  *   -  SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
 645  *   -  0 (during a shutdown, no data has to be returned)
 646  *
 647  * If we don't have stored data to work from, read a SSL/TLS record first
 648  * (possibly multiple records if we still don't have anything to return).
 649  *
 650  * This function must handle any surprises the peer may have for us, such as
 651  * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
 652  * a surprise, but handled as if it were), or renegotiation requests.
 653  * Also if record payloads contain fragments too small to process, we store
 654  * them until there is enough for the respective protocol (the record protocol
 655  * may use arbitrary fragmentation and even interleaving):
 656  *     Change cipher spec protocol
 657  *             just 1 byte needed, no need for keeping anything stored
 658  *     Alert protocol
 659  *             2 bytes needed (AlertLevel, AlertDescription)
 660  *     Handshake protocol
 661  *             4 bytes needed (HandshakeType, uint24 length) -- we just have
 662  *             to detect unexpected Client Hello and Hello Request messages
 663  *             here, anything else is handled by higher layers
 664  *     Application data protocol
 665  *             none of our business
 666  */
 667 int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
 668         {
 669         int al,i,j,ret;
 670         unsigned int n;
 671         SSL3_RECORD *rr;
 672         void (*cb)(const SSL *ssl,int type2,int val)=NULL;
 673
 674         if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
 675                 if (!ssl3_setup_buffers(s))
 676                         return(-1);
 677
 678     /* XXX: check what the second '&& type' is about */
 679         if ((type && (type != SSL3_RT_APPLICATION_DATA) &&
 680                 (type != SSL3_RT_HANDSHAKE) && type) ||
 681             (peek && (type != SSL3_RT_APPLICATION_DATA)))
 682                 {
 683                 SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
 684                 return -1;
 685                 }
 686
 687         /* check whether there's a handshake message (client hello?) waiting */
 688         if ( (ret = have_handshake_fragment(s, type, buf, len, peek)))
 689                 return ret;
 690
 691         /* Now s->d1->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
 692
 693         if (!s->in_handshake && SSL_in_init(s))
 694                 {
 695                 /* type == SSL3_RT_APPLICATION_DATA */
 696                 i=s->handshake_func(s);
 697                 if (i < 0) return(i);
 698                 if (i == 0)
 699                         {
 700                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 701                         return(-1);
 702                         }
 703                 }
 704
 705 start:
 706         s->rwstate=SSL_NOTHING;
 707
 708         /* s->s3->rrec.type         - is the type of record
 709          * s->s3->rrec.data,    - data
 710          * s->s3->rrec.off,     - offset into 'data' for next read
 711          * s->s3->rrec.length,  - number of bytes. */
 712         rr = &(s->s3->rrec);
 713
 714         /* We are not handshaking and have no data yet,
 715          * so process data buffered during the last handshake
 716          * in advance, if any.
 717          */
 718         if (s->state == SSL_ST_OK && rr->length == 0)
 719                 {
 720                 pitem *item;
 721                 item = pqueue_pop(s->d1->buffered_app_data.q);
 722                 if (item)
 723                         {
 724                         dtls1_copy_record(s, item);
 725
 726                         OPENSSL_free(item->data);
 727                         pitem_free(item);
 728                         }
 729                 }
 730
 731         /* Check for timeout */
 732         if (dtls1_is_timer_expired(s))
 733                 {
 734                 if (dtls1_read_failed(s, -1) > 0);
 735                         goto start;
 736                 }
 737
 738         /* get new packet if necessary */
 739         if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
 740                 {
 741                 ret=dtls1_get_record(s);
 742                 if (ret <= 0)
 743                         {
 744                         ret = dtls1_read_failed(s, ret);
 745                         /* anything other than a timeout is an error */
 746                         if (ret <= 0)
 747                                 return(ret);
 748                         else
 749                                 goto start;
 750                         }
 751                 }
 752
 753         /* we now have a packet which can be read and processed */
 754
 755         if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
 756                                        * reset by ssl3_get_finished */
 757                 && (rr->type != SSL3_RT_HANDSHAKE))
 758                 {
 759                 /* We now have application data between CCS and Finished.
 760                  * Most likely the packets were reordered on their way, so
 761                  * buffer the application data for later processing rather
 762                  * than dropping the connection.
 763                  */
 764                 dtls1_buffer_record(s, &(s->d1->buffered_app_data), 0);
 765                 rr->length = 0;
 766                 goto start;
 767                 }
 768
 769         /* If the other end has shut down, throw anything we read away
 770          * (even in 'peek' mode) */
 771         if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
 772                 {
 773                 rr->length=0;
 774                 s->rwstate=SSL_NOTHING;
 775                 return(0);
 776                 }
 777
 778
 779         if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
 780                 {
 781                 /* make sure that we are not getting application data when we
 782                  * are doing a handshake for the first time */
 783                 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
 784                         (s->enc_read_ctx == NULL))
 785                         {
 786                         al=SSL_AD_UNEXPECTED_MESSAGE;
 787                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
 788                         goto f_err;
 789                         }
 790
 791                 if (len <= 0) return(len);
 792
 793                 if ((unsigned int)len > rr->length)
 794                         n = rr->length;
 795                 else
 796                         n = (unsigned int)len;
 797
 798                 memcpy(buf,&(rr->data[rr->off]),n);
 799                 if (!peek)
 800                         {
 801                         rr->length-=n;
 802                         rr->off+=n;
 803                         if (rr->length == 0)
 804                                 {
 805                                 s->rstate=SSL_ST_READ_HEADER;
 806                                 rr->off=0;
 807                                 }
 808                         }
 809                 return(n);
 810                 }
 811
 812
 813         /* If we get here, then type != rr->type; if we have a handshake
 814          * message, then it was unexpected (Hello Request or Client Hello). */
 815
 816         /* In case of record types for which we have 'fragment' storage,
 817          * fill that so that we can process the data at a fixed place.
 818          */
 819                 {
 820                 unsigned int k, dest_maxlen = 0;
 821                 unsigned char *dest = NULL;
 822                 unsigned int *dest_len = NULL;
 823
 824                 if (rr->type == SSL3_RT_HANDSHAKE)
 825                         {
 826                         dest_maxlen = sizeof s->d1->handshake_fragment;
 827                         dest = s->d1->handshake_fragment;
 828                         dest_len = &s->d1->handshake_fragment_len;
 829                         }
 830                 else if (rr->type == SSL3_RT_ALERT)
 831                         {
 832                         dest_maxlen = sizeof(s->d1->alert_fragment);
 833                         dest = s->d1->alert_fragment;
 834                         dest_len = &s->d1->alert_fragment_len;
 835                         }
 836                 /* else it's a CCS message, or application data or wrong */
 837                 else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC)
 838                         {
 839                         /* Application data while renegotiating
 840                          * is allowed. Try again reading.
 841                          */
 842                         if (rr->type == SSL3_RT_APPLICATION_DATA)
 843                                 {
 844                                 BIO *bio;
 845                                 s->s3->in_read_app_data=2;
 846                                 bio=SSL_get_rbio(s);
 847                                 s->rwstate=SSL_READING;
 848                                 BIO_clear_retry_flags(bio);
 849                                 BIO_set_retry_read(bio);
 850                                 return(-1);
 851                                 }
 852
 853                         /* Not certain if this is the right error handling */
 854                         al=SSL_AD_UNEXPECTED_MESSAGE;
 855                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
 856                         goto f_err;
 857                         }
 858
 859                 if (dest_maxlen > 0)
 860                         {
 861             /* XDTLS:  In a pathalogical case, the Client Hello
 862              *  may be fragmented--don't always expect dest_maxlen bytes */
 863                         if ( rr->length < dest_maxlen)
 864                                 {
 865 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
 866                                 /*
 867                                  * for normal alerts rr->length is 2, while
 868                                  * dest_maxlen is 7 if we were to handle this
 869                                  * non-existing alert...
 870                                  */
 871                                 FIX ME
 872 #endif
 873                                 s->rstate=SSL_ST_READ_HEADER;
 874                                 rr->length = 0;
 875                                 goto start;
 876                                 }
 877
 878                         /* now move 'n' bytes: */
 879                         for ( k = 0; k < dest_maxlen; k++)
 880                                 {
 881                                 dest[k] = rr->data[rr->off++];
 882                                 rr->length--;
 883                                 }
 884                         *dest_len = dest_maxlen;
 885                         }
 886                 }
 887
 888         /* s->d1->handshake_fragment_len == 12  iff  rr->type == SSL3_RT_HANDSHAKE;
 889          * s->d1->alert_fragment_len == 7      iff  rr->type == SSL3_RT_ALERT.
 890          * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
 891
 892         /* If we are a client, check for an incoming 'Hello Request': */
 893         if ((!s->server) &&
 894                 (s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
 895                 (s->d1->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
 896                 (s->session != NULL) && (s->session->cipher != NULL))
 897                 {
 898                 s->d1->handshake_fragment_len = 0;
 899
 900                 if ((s->d1->handshake_fragment[1] != 0) ||
 901                         (s->d1->handshake_fragment[2] != 0) ||
 902                         (s->d1->handshake_fragment[3] != 0))
 903                         {
 904                         al=SSL_AD_DECODE_ERROR;
 905                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
 906                         goto err;
 907                         }
 908
 909                 /* no need to check sequence number on HELLO REQUEST messages */
 910
 911                 if (s->msg_callback)
 912                         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
 913                                 s->d1->handshake_fragment, 4, s, s->msg_callback_arg);
 914
 915                 if (SSL_is_init_finished(s) &&
 916                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
 917                         !s->s3->renegotiate)
 918                         {
 919                         ssl3_renegotiate(s);
 920                         if (ssl3_renegotiate_check(s))
 921                                 {
 922                                 i=s->handshake_func(s);
 923                                 if (i < 0) return(i);
 924                                 if (i == 0)
 925                                         {
 926                                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 927                                         return(-1);
 928                                         }
 929
 930                                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
 931                                         {
 932                                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
 933                                                 {
 934                                                 BIO *bio;
 935                                                 /* In the case where we try to read application data,
 936                                                  * but we trigger an SSL handshake, we return -1 with
 937                                                  * the retry option set.  Otherwise renegotiation may
 938                                                  * cause nasty problems in the blocking world */
 939                                                 s->rwstate=SSL_READING;
 940                                                 bio=SSL_get_rbio(s);
 941                                                 BIO_clear_retry_flags(bio);
 942                                                 BIO_set_retry_read(bio);
 943                                                 return(-1);
 944                                                 }
 945                                         }
 946                                 }
 947                         }
 948                 /* we either finished a handshake or ignored the request,
 949                  * now try again to obtain the (application) data we were asked for */
 950                 goto start;
 951                 }
 952
 953         if (s->d1->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH)
 954                 {
 955                 int alert_level = s->d1->alert_fragment[0];
 956                 int alert_descr = s->d1->alert_fragment[1];
 957
 958                 s->d1->alert_fragment_len = 0;
 959
 960                 if (s->msg_callback)
 961                         s->msg_callback(0, s->version, SSL3_RT_ALERT,
 962                                 s->d1->alert_fragment, 2, s, s->msg_callback_arg);
 963
 964                 if (s->info_callback != NULL)
 965                         cb=s->info_callback;
 966                 else if (s->ctx->info_callback != NULL)
 967                         cb=s->ctx->info_callback;
 968
 969                 if (cb != NULL)
 970                         {
 971                         j = (alert_level << 8) | alert_descr;
 972                         cb(s, SSL_CB_READ_ALERT, j);
 973                         }
 974
 975                 if (alert_level == 1) /* warning */
 976                         {
 977                         s->s3->warn_alert = alert_descr;
 978                         if (alert_descr == SSL_AD_CLOSE_NOTIFY)
 979                                 {
 980                                 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
 981                                 return(0);
 982                                 }
 983 #if 0
 984             /* XXX: this is a possible improvement in the future */
 985                         /* now check if it's a missing record */
 986                         if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
 987                                 {
 988                                 unsigned short seq;
 989                                 unsigned int frag_off;
 990                                 unsigned char *p = &(s->d1->alert_fragment[2]);
 991
 992                                 n2s(p, seq);
 993                                 n2l3(p, frag_off);
 994
 995                                 dtls1_retransmit_message(s,
 996                                                                                  dtls1_get_queue_priority(frag->msg_header.seq, 0),
 997                                                                                  frag_off, &found);
 998                                 if ( ! found  && SSL_in_init(s))
 999                                         {
1000                                         /* fprintf( stderr,"in init = %d\n", SSL_in_init(s)); */
1001                                         /* requested a message not yet sent,
1002                                            send an alert ourselves */
1003                                         ssl3_send_alert(s,SSL3_AL_WARNING,
1004                                                 DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
1005                                         }
1006                                 }
1007 #endif
1008                         }
1009                 else if (alert_level == 2) /* fatal */
1010                         {
1011                         char tmp[16];
1012
1013                         s->rwstate=SSL_NOTHING;
1014                         s->s3->fatal_alert = alert_descr;
1015                         SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1016                         BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1017                         ERR_add_error_data(2,"SSL alert number ",tmp);
1018                         s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1019                         SSL_CTX_remove_session(s->ctx,s->session);
1020                         return(0);
1021                         }
1022                 else
1023                         {
1024                         al=SSL_AD_ILLEGAL_PARAMETER;
1025                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1026                         goto f_err;
1027                         }
1028
1029                 goto start;
1030                 }
1031
1032         if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1033                 {
1034                 s->rwstate=SSL_NOTHING;
1035                 rr->length=0;
1036                 return(0);
1037                 }
1038
1039         if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1040                 {
1041                 struct ccs_header_st ccs_hdr;
1042                 unsigned int ccs_hdr_len = DTLS1_CCS_HEADER_LENGTH;
1043
1044                 dtls1_get_ccs_header(rr->data, &ccs_hdr);
1045
1046                 /* 'Change Cipher Spec' is just a single byte, so we know
1047                  * exactly what the record payload has to look like */
1048                 /* XDTLS: check that epoch is consistent */
1049                 if (s->client_version == DTLS1_BAD_VER || s->version == DTLS1_BAD_VER)
1050                         ccs_hdr_len = 3;
1051
1052                 if ((rr->length != ccs_hdr_len) || (rr->off != 0) || (rr->data[0] != SSL3_MT_CCS))
1053                         {
1054                         i=SSL_AD_ILLEGAL_PARAMETER;
1055                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1056                         goto err;
1057                         }
1058
1059                 rr->length=0;
1060
1061                 if (s->msg_callback)
1062                         s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,
1063                                 rr->data, 1, s, s->msg_callback_arg);
1064
1065                 /* We can't process a CCS now, because previous handshake
1066                  * messages are still missing, so just drop it.
1067                  */
1068                 if (!s->d1->change_cipher_spec_ok)
1069                         {
1070                         goto start;
1071                         }
1072
1073                 s->d1->change_cipher_spec_ok = 0;
1074
1075                 s->s3->change_cipher_spec=1;
1076                 if (!ssl3_do_change_cipher_spec(s))
1077                         goto err;
1078
1079                 /* do this whenever CCS is processed */
1080                 dtls1_reset_seq_numbers(s, SSL3_CC_READ);
1081
1082                 if (s->client_version == DTLS1_BAD_VER)
1083                         s->d1->handshake_read_seq++;
1084
1085                 goto start;
1086                 }
1087
1088         /* Unexpected handshake message (Client Hello, or protocol violation) */
1089         if ((s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
1090                 !s->in_handshake)
1091                 {
1092                 struct hm_header_st msg_hdr;
1093
1094                 /* this may just be a stale retransmit */
1095                 dtls1_get_message_header(rr->data, &msg_hdr);
1096                 if( rr->epoch != s->d1->r_epoch)
1097                         {
1098                         rr->length = 0;
1099                         goto start;
1100                         }
1101
1102                 /* If we are server, we may have a repeated FINISHED of the
1103                  * client here, then retransmit our CCS and FINISHED.
1104                  */
1105                 if (msg_hdr.type == SSL3_MT_FINISHED)
1106                         {
1107                         dtls1_retransmit_buffered_messages(s);
1108                         rr->length = 0;
1109                         goto start;
1110                         }
1111
1112                 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1113                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1114                         {
1115 #if 0 /* worked only because C operator preferences are not as expected (and
1116        * because this is not really needed for clients except for detecting
1117        * protocol violations): */
1118                         s->state=SSL_ST_BEFORE|(s->server)
1119                                 ?SSL_ST_ACCEPT
1120                                 :SSL_ST_CONNECT;
1121 #else
1122                         s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1123 #endif
1124                         s->new_session=1;
1125                         }
1126                 i=s->handshake_func(s);
1127                 if (i < 0) return(i);
1128                 if (i == 0)
1129                         {
1130                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1131                         return(-1);
1132                         }
1133
1134                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1135                         {
1136                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1137                                 {
1138                                 BIO *bio;
1139                                 /* In the case where we try to read application data,
1140                                  * but we trigger an SSL handshake, we return -1 with
1141                                  * the retry option set.  Otherwise renegotiation may
1142                                  * cause nasty problems in the blocking world */
1143                                 s->rwstate=SSL_READING;
1144                                 bio=SSL_get_rbio(s);
1145                                 BIO_clear_retry_flags(bio);
1146                                 BIO_set_retry_read(bio);
1147                                 return(-1);
1148                                 }
1149                         }
1150                 goto start;
1151                 }
1152
1153         switch (rr->type)
1154                 {
1155         default:
1156 #ifndef OPENSSL_NO_TLS
1157                 /* TLS just ignores unknown message types */
1158                 if (s->version == TLS1_VERSION)
1159                         {
1160                         rr->length = 0;
1161                         goto start;
1162                         }
1163 #endif
1164                 al=SSL_AD_UNEXPECTED_MESSAGE;
1165                 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1166                 goto f_err;
1167         case SSL3_RT_CHANGE_CIPHER_SPEC:
1168         case SSL3_RT_ALERT:
1169         case SSL3_RT_HANDSHAKE:
1170                 /* we already handled all of these, with the possible exception
1171                  * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1172                  * should not happen when type != rr->type */
1173                 al=SSL_AD_UNEXPECTED_MESSAGE;
1174                 SSLerr(SSL_F_DTLS1_READ_BYTES,ERR_R_INTERNAL_ERROR);
1175                 goto f_err;
1176         case SSL3_RT_APPLICATION_DATA:
1177                 /* At this point, we were expecting handshake data,
1178                  * but have application data.  If the library was
1179                  * running inside ssl3_read() (i.e. in_read_app_data
1180                  * is set) and it makes sense to read application data
1181                  * at this point (session renegotiation not yet started),
1182                  * we will indulge it.
1183                  */
1184                 if (s->s3->in_read_app_data &&
1185                         (s->s3->total_renegotiations != 0) &&
1186                         ((
1187                                 (s->state & SSL_ST_CONNECT) &&
1188                                 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1189                                 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1190                                 ) || (
1191                                         (s->state & SSL_ST_ACCEPT) &&
1192                                         (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1193                                         (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1194                                         )
1195                                 ))
1196                         {
1197                         s->s3->in_read_app_data=2;
1198                         return(-1);
1199                         }
1200                 else
1201                         {
1202                         al=SSL_AD_UNEXPECTED_MESSAGE;
1203                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1204                         goto f_err;
1205                         }
1206                 }
1207         /* not reached */
1208
1209 f_err:
1210         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1211 err:
1212         return(-1);
1213         }
1214
1215 int
1216 dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len)
1217         {
1218         unsigned int n,tot;
1219         int i;
1220
1221         if (SSL_in_init(s) && !s->in_handshake)
1222                 {
1223                 i=s->handshake_func(s);
1224                 if (i < 0) return(i);
1225                 if (i == 0)
1226                         {
1227                         SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1228                         return -1;
1229                         }
1230                 }
1231
1232         tot = s->s3->wnum;
1233         n = len - tot;
1234
1235         while( n)
1236                 {
1237                 /* dtls1_write_bytes sends one record at a time, sized according to
1238                  * the currently known MTU */
1239                 i = dtls1_write_bytes(s, type, buf_, len);
1240                 if (i <= 0) return i;
1241
1242                 if ((i == (int)n) ||
1243                         (type == SSL3_RT_APPLICATION_DATA &&
1244                                 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
1245                         {
1246                         /* next chunk of data should get another prepended empty fragment
1247                          * in ciphersuites with known-IV weakness: */
1248                         s->s3->empty_fragment_done = 0;
1249                         return tot+i;
1250                         }
1251
1252                 tot += i;
1253                 n-=i;
1254                 }
1255
1256         return tot;
1257         }
1258
1259
1260         /* this only happens when a client hello is received and a handshake
1261          * is started. */
1262 static int
1263 have_handshake_fragment(SSL *s, int type, unsigned char *buf,
1264         int len, int peek)
1265         {
1266
1267         if ((type == SSL3_RT_HANDSHAKE) && (s->d1->handshake_fragment_len > 0))
1268                 /* (partially) satisfy request from storage */
1269                 {
1270                 unsigned char *src = s->d1->handshake_fragment;
1271                 unsigned char *dst = buf;
1272                 unsigned int k,n;
1273
1274                 /* peek == 0 */
1275                 n = 0;
1276                 while ((len > 0) && (s->d1->handshake_fragment_len > 0))
1277                         {
1278                         *dst++ = *src++;
1279                         len--; s->d1->handshake_fragment_len--;
1280                         n++;
1281                         }
1282                 /* move any remaining fragment bytes: */
1283                 for (k = 0; k < s->d1->handshake_fragment_len; k++)
1284                         s->d1->handshake_fragment[k] = *src++;
1285                 return n;
1286                 }
1287
1288         return 0;
1289         }
1290
1291
1292
1293
1294 /* Call this to write data in records of type 'type'
1295  * It will return <= 0 if not all data has been sent or non-blocking IO.
1296  */
1297 int dtls1_write_bytes(SSL *s, int type, const void *buf_, int len)
1298         {
1299         const unsigned char *buf=buf_;
1300         unsigned int tot,n,nw;
1301         int i;
1302         unsigned int mtu;
1303
1304         s->rwstate=SSL_NOTHING;
1305         tot=s->s3->wnum;
1306
1307         n=(len-tot);
1308
1309         /* handshake layer figures out MTU for itself, but data records
1310          * are also sent through this interface, so need to figure out MTU */
1311 #if 0
1312         mtu = BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_GET_MTU, 0, NULL);
1313         mtu += DTLS1_HM_HEADER_LENGTH;  /* HM already inserted */
1314 #endif
1315         mtu = s->d1->mtu;
1316
1317         if (mtu > SSL3_RT_MAX_PLAIN_LENGTH)
1318                 mtu = SSL3_RT_MAX_PLAIN_LENGTH;
1319
1320         if (n > mtu)
1321                 nw=mtu;
1322         else
1323                 nw=n;
1324
1325         i=do_dtls1_write(s, type, &(buf[tot]), nw, 0);
1326         if (i <= 0)
1327                 {
1328                 s->s3->wnum=tot;
1329                 return i;
1330                 }
1331
1332         if ( (int)s->s3->wnum + i == len)
1333                 s->s3->wnum = 0;
1334         else
1335                 s->s3->wnum += i;
1336
1337         return i;
1338         }
1339
1340 int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len, int create_empty_fragment)
1341         {
1342         unsigned char *p,*pseq;
1343         int i,mac_size,clear=0;
1344         int prefix_len = 0;
1345         SSL3_RECORD *wr;
1346         SSL3_BUFFER *wb;
1347         SSL_SESSION *sess;
1348         int bs;
1349
1350         /* first check if there is a SSL3_BUFFER still being written
1351          * out.  This will happen with non blocking IO */
1352         if (s->s3->wbuf.left != 0)
1353                 {
1354                 OPENSSL_assert(0); /* XDTLS:  want to see if we ever get here */
1355                 return(ssl3_write_pending(s,type,buf,len));
1356                 }
1357
1358         /* If we have an alert to send, lets send it */
1359         if (s->s3->alert_dispatch)
1360                 {
1361                 i=s->method->ssl_dispatch_alert(s);
1362                 if (i <= 0)
1363                         return(i);
1364                 /* if it went, fall through and send more stuff */
1365                 }
1366
1367         if (len == 0 && !create_empty_fragment)
1368                 return 0;
1369
1370         wr= &(s->s3->wrec);
1371         wb= &(s->s3->wbuf);
1372         sess=s->session;
1373
1374         if (    (sess == NULL) ||
1375                 (s->enc_write_ctx == NULL) ||
1376                 (s->write_hash == NULL))
1377                 clear=1;
1378
1379         if (clear)
1380                 mac_size=0;
1381         else
1382                 mac_size=EVP_MD_size(s->write_hash);
1383
1384         /* DTLS implements explicit IV, so no need for empty fragments */
1385 #if 0
1386         /* 'create_empty_fragment' is true only when this function calls itself */
1387         if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done
1388             && SSL_version(s) != DTLS1_VERSION && SSL_version(s) != DTLS1_BAD_VER)
1389                 {
1390                 /* countermeasure against known-IV weakness in CBC ciphersuites
1391                  * (see http://www.openssl.org/~bodo/tls-cbc.txt)
1392                  */
1393
1394                 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
1395                         {
1396                         /* recursive function call with 'create_empty_fragment' set;
1397                          * this prepares and buffers the data for an empty fragment
1398                          * (these 'prefix_len' bytes are sent out later
1399                          * together with the actual payload) */
1400                         prefix_len = s->method->do_ssl_write(s, type, buf, 0, 1);
1401                         if (prefix_len <= 0)
1402                                 goto err;
1403
1404                         if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE)
1405                                 {
1406                                 /* insufficient space */
1407                                 SSLerr(SSL_F_DO_DTLS1_WRITE, ERR_R_INTERNAL_ERROR);
1408                                 goto err;
1409                                 }
1410                         }
1411
1412                 s->s3->empty_fragment_done = 1;
1413                 }
1414 #endif
1415
1416         p = wb->buf + prefix_len;
1417
1418         /* write the header */
1419
1420         *(p++)=type&0xff;
1421         wr->type=type;
1422
1423         if (s->client_version == DTLS1_BAD_VER)
1424                 *(p++) = DTLS1_BAD_VER>>8,
1425                 *(p++) = DTLS1_BAD_VER&0xff;
1426         else
1427                 *(p++)=(s->version>>8),
1428                 *(p++)=s->version&0xff;
1429
1430         /* field where we are to write out packet epoch, seq num and len */
1431         pseq=p;
1432         p+=10;
1433
1434         /* lets setup the record stuff. */
1435
1436         /* Make space for the explicit IV in case of CBC.
1437          * (this is a bit of a boundary violation, but what the heck).
1438          */
1439         if ( s->enc_write_ctx &&
1440                 (EVP_CIPHER_mode( s->enc_write_ctx->cipher ) & EVP_CIPH_CBC_MODE))
1441                 bs = EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
1442         else
1443                 bs = 0;
1444
1445         wr->data=p + bs;  /* make room for IV in case of CBC */
1446         wr->length=(int)len;
1447         wr->input=(unsigned char *)buf;
1448
1449         /* we now 'read' from wr->input, wr->length bytes into
1450          * wr->data */
1451
1452         /* first we compress */
1453         if (s->compress != NULL)
1454                 {
1455                 if (!ssl3_do_compress(s))
1456                         {
1457                         SSLerr(SSL_F_DO_DTLS1_WRITE,SSL_R_COMPRESSION_FAILURE);
1458                         goto err;
1459                         }
1460                 }
1461         else
1462                 {
1463                 memcpy(wr->data,wr->input,wr->length);
1464                 wr->input=wr->data;
1465                 }
1466
1467         /* we should still have the output to wr->data and the input
1468          * from wr->input.  Length should be wr->length.
1469          * wr->data still points in the wb->buf */
1470
1471         if (mac_size != 0)
1472                 {
1473                 s->method->ssl3_enc->mac(s,&(p[wr->length + bs]),1);
1474                 wr->length+=mac_size;
1475                 }
1476
1477         /* this is true regardless of mac size */
1478         wr->input=p;
1479         wr->data=p;
1480
1481
1482         /* ssl3_enc can only have an error on read */
1483         if (bs) /* bs != 0 in case of CBC */
1484                 {
1485                 RAND_pseudo_bytes(p,bs);
1486                 /* master IV and last CBC residue stand for
1487                  * the rest of randomness */
1488                 wr->length += bs;
1489                 }
1490
1491         s->method->ssl3_enc->enc(s,1);
1492
1493         /* record length after mac and block padding */
1494 /*      if (type == SSL3_RT_APPLICATION_DATA ||
1495         (type == SSL3_RT_ALERT && ! SSL_in_init(s))) */
1496
1497         /* there's only one epoch between handshake and app data */
1498
1499         s2n(s->d1->w_epoch, pseq);
1500
1501         /* XDTLS: ?? */
1502 /*      else
1503         s2n(s->d1->handshake_epoch, pseq); */
1504
1505         memcpy(pseq, &(s->s3->write_sequence[2]), 6);
1506         pseq+=6;
1507         s2n(wr->length,pseq);
1508
1509         /* we should now have
1510          * wr->data pointing to the encrypted data, which is
1511          * wr->length long */
1512         wr->type=type; /* not needed but helps for debugging */
1513         wr->length+=DTLS1_RT_HEADER_LENGTH;
1514
1515 #if 0  /* this is now done at the message layer */
1516         /* buffer the record, making it easy to handle retransmits */
1517         if ( type == SSL3_RT_HANDSHAKE || type == SSL3_RT_CHANGE_CIPHER_SPEC)
1518                 dtls1_buffer_record(s, wr->data, wr->length,
1519                         *((PQ_64BIT *)&(s->s3->write_sequence[0])));
1520 #endif
1521
1522         ssl3_record_sequence_update(&(s->s3->write_sequence[0]));
1523
1524         if (create_empty_fragment)
1525                 {
1526                 /* we are in a recursive call;
1527                  * just return the length, don't write out anything here
1528                  */
1529                 return wr->length;
1530                 }
1531
1532         /* now let's set up wb */
1533         wb->left = prefix_len + wr->length;
1534         wb->offset = 0;
1535
1536         /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
1537         s->s3->wpend_tot=len;
1538         s->s3->wpend_buf=buf;
1539         s->s3->wpend_type=type;
1540         s->s3->wpend_ret=len;
1541
1542         /* we now just need to write the buffer */
1543         return ssl3_write_pending(s,type,buf,len);
1544 err:
1545         return -1;
1546         }
1547
1548
1549
1550 static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap,
1551         PQ_64BIT *seq_num)
1552         {
1553 #if PQ_64BIT_IS_INTEGER
1554         PQ_64BIT mask = 0x0000000000000001L;
1555 #endif
1556         PQ_64BIT rcd_num, tmp;
1557
1558         pq_64bit_init(&rcd_num);
1559         pq_64bit_init(&tmp);
1560
1561         /* this is the sequence number for the record just read */
1562         pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8);
1563
1564
1565         if (pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) ||
1566                 pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num)))
1567                 {
1568                 pq_64bit_assign(seq_num, &rcd_num);
1569                 pq_64bit_free(&rcd_num);
1570                 pq_64bit_free(&tmp);
1571                 return 1;  /* this record is new */
1572                 }
1573
1574         pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
1575
1576         if ( pq_64bit_get_word(&tmp) > bitmap->length)
1577                 {
1578                 pq_64bit_free(&rcd_num);
1579                 pq_64bit_free(&tmp);
1580                 return 0;  /* stale, outside the window */
1581                 }
1582
1583 #if PQ_64BIT_IS_BIGNUM
1584         {
1585         int offset;
1586         pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
1587         pq_64bit_sub_word(&tmp, 1);
1588         offset = pq_64bit_get_word(&tmp);
1589         if ( pq_64bit_is_bit_set(&(bitmap->map), offset))
1590                 {
1591                 pq_64bit_free(&rcd_num);
1592                 pq_64bit_free(&tmp);
1593                 return 0;
1594                 }
1595         }
1596 #else
1597         mask <<= (bitmap->max_seq_num - rcd_num - 1);
1598         if (bitmap->map & mask)
1599                 return 0; /* record previously received */
1600 #endif
1601
1602         pq_64bit_assign(seq_num, &rcd_num);
1603         pq_64bit_free(&rcd_num);
1604         pq_64bit_free(&tmp);
1605         return 1;
1606         }
1607
1608
1609 static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap)
1610         {
1611         unsigned int shift;
1612         PQ_64BIT rcd_num;
1613         PQ_64BIT tmp;
1614         PQ_64BIT_CTX *ctx;
1615
1616         pq_64bit_init(&rcd_num);
1617         pq_64bit_init(&tmp);
1618
1619         pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8);
1620
1621         /* unfortunate code complexity due to 64-bit manipulation support
1622          * on 32-bit machines */
1623         if ( pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) ||
1624                 pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num)))
1625                 {
1626                 pq_64bit_sub(&tmp, &rcd_num, &(bitmap->max_seq_num));
1627                 pq_64bit_add_word(&tmp, 1);
1628
1629                 shift = (unsigned int)pq_64bit_get_word(&tmp);
1630
1631                 pq_64bit_lshift(&(tmp), &(bitmap->map), shift);
1632                 pq_64bit_assign(&(bitmap->map), &tmp);
1633
1634                 pq_64bit_set_bit(&(bitmap->map), 0);
1635                 pq_64bit_add_word(&rcd_num, 1);
1636                 pq_64bit_assign(&(bitmap->max_seq_num), &rcd_num);
1637
1638                 pq_64bit_assign_word(&tmp, 1);
1639                 pq_64bit_lshift(&tmp, &tmp, bitmap->length);
1640                 ctx = pq_64bit_ctx_new(&ctx);
1641                 pq_64bit_mod(&(bitmap->map), &(bitmap->map), &tmp, ctx);
1642                 pq_64bit_ctx_free(ctx);
1643                 }
1644         else
1645                 {
1646                 pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
1647                 pq_64bit_sub_word(&tmp, 1);
1648                 shift = (unsigned int)pq_64bit_get_word(&tmp);
1649
1650                 pq_64bit_set_bit(&(bitmap->map), shift);
1651                 }
1652
1653         pq_64bit_free(&rcd_num);
1654         pq_64bit_free(&tmp);
1655         }
1656
1657
1658 int dtls1_dispatch_alert(SSL *s)
1659         {
1660         int i,j;
1661         void (*cb)(const SSL *ssl,int type,int val)=NULL;
1662         unsigned char buf[DTLS1_AL_HEADER_LENGTH];
1663         unsigned char *ptr = &buf[0];
1664
1665         s->s3->alert_dispatch=0;
1666
1667         memset(buf, 0x00, sizeof(buf));
1668         *ptr++ = s->s3->send_alert[0];
1669         *ptr++ = s->s3->send_alert[1];
1670
1671 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1672         if (s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
1673                 {
1674                 s2n(s->d1->handshake_read_seq, ptr);
1675 #if 0
1676                 if ( s->d1->r_msg_hdr.frag_off == 0)  /* waiting for a new msg */
1677
1678                 else
1679                         s2n(s->d1->r_msg_hdr.seq, ptr); /* partial msg read */
1680 #endif
1681
1682 #if 0
1683                 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);
1684 #endif
1685                 l2n3(s->d1->r_msg_hdr.frag_off, ptr);
1686                 }
1687 #endif
1688
1689         i = do_dtls1_write(s, SSL3_RT_ALERT, &buf[0], sizeof(buf), 0);
1690         if (i <= 0)
1691                 {
1692                 s->s3->alert_dispatch=1;
1693                 /* fprintf( stderr, "not done with alert\n" ); */
1694                 }
1695         else
1696                 {
1697                 if (s->s3->send_alert[0] == SSL3_AL_FATAL
1698 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1699                     || s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1700 #endif
1701                    )
1702                         (void)BIO_flush(s->wbio);
1703
1704                 if (s->msg_callback)
1705                         s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert,
1706                                 2, s, s->msg_callback_arg);
1707
1708                 if (s->info_callback != NULL)
1709                         cb=s->info_callback;
1710                 else if (s->ctx->info_callback != NULL)
1711                         cb=s->ctx->info_callback;
1712
1713                 if (cb != NULL)
1714                         {
1715                         j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1716                         cb(s,SSL_CB_WRITE_ALERT,j);
1717                         }
1718                 }
1719         return(i);
1720         }
1721
1722
1723 static DTLS1_BITMAP *
1724 dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, unsigned int *is_next_epoch)
1725     {
1726
1727     *is_next_epoch = 0;
1728
1729     /* In current epoch, accept HM, CCS, DATA, & ALERT */
1730     if (rr->epoch == s->d1->r_epoch)
1731         return &s->d1->bitmap;
1732
1733     /* Only HM and ALERT messages can be from the next epoch */
1734     else if (rr->epoch == (unsigned long)(s->d1->r_epoch + 1) &&
1735         (rr->type == SSL3_RT_HANDSHAKE ||
1736             rr->type == SSL3_RT_ALERT))
1737         {
1738         *is_next_epoch = 1;
1739         return &s->d1->next_bitmap;
1740         }
1741
1742     return NULL;
1743     }
1744
1745 #if 0
1746 static int
1747 dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, unsigned short *priority,
1748         unsigned long *offset)
1749         {
1750
1751         /* alerts are passed up immediately */
1752         if ( rr->type == SSL3_RT_APPLICATION_DATA ||
1753                 rr->type == SSL3_RT_ALERT)
1754                 return 0;
1755
1756         /* Only need to buffer if a handshake is underway.
1757          * (this implies that Hello Request and Client Hello are passed up
1758          * immediately) */
1759         if ( SSL_in_init(s))
1760                 {
1761                 unsigned char *data = rr->data;
1762                 /* need to extract the HM/CCS sequence number here */
1763                 if ( rr->type == SSL3_RT_HANDSHAKE ||
1764                         rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1765                         {
1766                         unsigned short seq_num;
1767                         struct hm_header_st msg_hdr;
1768                         struct ccs_header_st ccs_hdr;
1769
1770                         if ( rr->type == SSL3_RT_HANDSHAKE)
1771                                 {
1772                                 dtls1_get_message_header(data, &msg_hdr);
1773                                 seq_num = msg_hdr.seq;
1774                                 *offset = msg_hdr.frag_off;
1775                                 }
1776                         else
1777                                 {
1778                                 dtls1_get_ccs_header(data, &ccs_hdr);
1779                                 seq_num = ccs_hdr.seq;
1780                                 *offset = 0;
1781                                 }
1782
1783                         /* this is either a record we're waiting for, or a
1784                          * retransmit of something we happened to previously
1785                          * receive (higher layers will drop the repeat silently */
1786                         if ( seq_num < s->d1->handshake_read_seq)
1787                                 return 0;
1788                         if (rr->type == SSL3_RT_HANDSHAKE &&
1789                                 seq_num == s->d1->handshake_read_seq &&
1790                                 msg_hdr.frag_off < s->d1->r_msg_hdr.frag_off)
1791                                 return 0;
1792                         else if ( seq_num == s->d1->handshake_read_seq &&
1793                                 (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC ||
1794                                         msg_hdr.frag_off == s->d1->r_msg_hdr.frag_off))
1795                                 return 0;
1796                         else
1797                                 {
1798                                 *priority = seq_num;
1799                                 return 1;
1800                                 }
1801                         }
1802                 else /* unknown record type */
1803                         return 0;
1804                 }
1805
1806         return 0;
1807         }
1808 #endif
1809
1810 void
1811 dtls1_reset_seq_numbers(SSL *s, int rw)
1812         {
1813         unsigned char *seq;
1814         unsigned int seq_bytes = sizeof(s->s3->read_sequence);
1815
1816         if ( rw & SSL3_CC_READ)
1817                 {
1818                 seq = s->s3->read_sequence;
1819                 s->d1->r_epoch++;
1820
1821                 pq_64bit_assign(&(s->d1->bitmap.map), &(s->d1->next_bitmap.map));
1822                 s->d1->bitmap.length = s->d1->next_bitmap.length;
1823                 pq_64bit_assign(&(s->d1->bitmap.max_seq_num),
1824                         &(s->d1->next_bitmap.max_seq_num));
1825
1826                 pq_64bit_free(&(s->d1->next_bitmap.map));
1827                 pq_64bit_free(&(s->d1->next_bitmap.max_seq_num));
1828                 memset(&(s->d1->next_bitmap), 0x00, sizeof(DTLS1_BITMAP));
1829                 pq_64bit_init(&(s->d1->next_bitmap.map));
1830                 pq_64bit_init(&(s->d1->next_bitmap.max_seq_num));
1831                 }
1832         else
1833                 {
1834                 seq = s->s3->write_sequence;
1835                 memcpy(s->d1->last_write_sequence, seq, sizeof(s->s3->write_sequence));
1836                 s->d1->w_epoch++;
1837                 }
1838
1839         memset(seq, 0x00, seq_bytes);
1840         }
1841
1842 #if PQ_64BIT_IS_INTEGER
1843 static PQ_64BIT
1844 bytes_to_long_long(unsigned char *bytes, PQ_64BIT *num)
1845        {
1846        PQ_64BIT _num;
1847
1848        _num = (((PQ_64BIT)bytes[0]) << 56) |
1849                (((PQ_64BIT)bytes[1]) << 48) |
1850                (((PQ_64BIT)bytes[2]) << 40) |
1851                (((PQ_64BIT)bytes[3]) << 32) |
1852                (((PQ_64BIT)bytes[4]) << 24) |
1853                (((PQ_64BIT)bytes[5]) << 16) |
1854                (((PQ_64BIT)bytes[6]) <<  8) |
1855                (((PQ_64BIT)bytes[7])      );
1856
1857            *num = _num ;
1858        return _num;
1859        }
1860 #endif
1861
1862
1863 static void
1864 dtls1_clear_timeouts(SSL *s)
1865         {
1866         memset(&(s->d1->timeout), 0x00, sizeof(struct dtls1_timeout_st));
1867         }