crypto/openssl/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
 143 /* copy buffered record into SSL structure */
 144 static int
 145 dtls1_copy_record(SSL *s, pitem *item)
 146     {
 147     DTLS1_RECORD_DATA *rdata;
 148
 149     rdata = (DTLS1_RECORD_DATA *)item->data;
 150
 151     if (s->s3->rbuf.buf != NULL)
 152         OPENSSL_free(s->s3->rbuf.buf);
 153
 154     s->packet = rdata->packet;
 155     s->packet_length = rdata->packet_length;
 156     memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
 157     memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
 158
 159         /* Set proper sequence number for mac calculation */
 160         memcpy(&(s->s3->read_sequence[2]), &(rdata->packet[5]), 6);
 161
 162     return(1);
 163     }
 164
 165
 166 static int
 167 dtls1_buffer_record(SSL *s, record_pqueue *queue, PQ_64BIT *priority)
 168 {
 169     DTLS1_RECORD_DATA *rdata;
 170         pitem *item;
 171
 172         /* Limit the size of the queue to prevent DOS attacks */
 173         if (pqueue_size(queue->q) >= 100)
 174                 return 0;
 175
 176         rdata = OPENSSL_malloc(sizeof(DTLS1_RECORD_DATA));
 177         item = pitem_new(*priority, rdata);
 178         if (rdata == NULL || item == NULL)
 179                 {
 180                 if (rdata != NULL) OPENSSL_free(rdata);
 181                 if (item != NULL) pitem_free(item);
 182
 183                 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
 184                 return(0);
 185                 }
 186
 187         rdata->packet = s->packet;
 188         rdata->packet_length = s->packet_length;
 189         memcpy(&(rdata->rbuf), &(s->s3->rbuf), sizeof(SSL3_BUFFER));
 190         memcpy(&(rdata->rrec), &(s->s3->rrec), sizeof(SSL3_RECORD));
 191
 192         item->data = rdata;
 193
 194         /* insert should not fail, since duplicates are dropped */
 195         if (pqueue_insert(queue->q, item) == NULL)
 196                 {
 197                 OPENSSL_free(rdata);
 198                 pitem_free(item);
 199                 return(0);
 200                 }
 201
 202         s->packet = NULL;
 203         s->packet_length = 0;
 204         memset(&(s->s3->rbuf), 0, sizeof(SSL3_BUFFER));
 205         memset(&(s->s3->rrec), 0, sizeof(SSL3_RECORD));
 206
 207         if (!ssl3_setup_buffers(s))
 208                 {
 209                 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
 210                 OPENSSL_free(rdata);
 211                 pitem_free(item);
 212                 return(0);
 213                 }
 214
 215         return(1);
 216     }
 217
 218
 219 static int
 220 dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue)
 221     {
 222     pitem *item;
 223
 224     item = pqueue_pop(queue->q);
 225     if (item)
 226         {
 227         dtls1_copy_record(s, item);
 228
 229         OPENSSL_free(item->data);
 230                 pitem_free(item);
 231
 232         return(1);
 233         }
 234
 235     return(0);
 236     }
 237
 238
 239 /* retrieve a buffered record that belongs to the new epoch, i.e., not processed
 240  * yet */
 241 #define dtls1_get_unprocessed_record(s) \
 242                    dtls1_retrieve_buffered_record((s), \
 243                    &((s)->d1->unprocessed_rcds))
 244
 245 /* retrieve a buffered record that belongs to the current epoch, ie, processed */
 246 #define dtls1_get_processed_record(s) \
 247                    dtls1_retrieve_buffered_record((s), \
 248                    &((s)->d1->processed_rcds))
 249
 250 static int
 251 dtls1_process_buffered_records(SSL *s)
 252     {
 253     pitem *item;
 254
 255     item = pqueue_peek(s->d1->unprocessed_rcds.q);
 256     if (item)
 257         {
 258         /* Check if epoch is current. */
 259         if (s->d1->unprocessed_rcds.epoch != s->d1->r_epoch)
 260             return(1);  /* Nothing to do. */
 261
 262         /* Process all the records. */
 263         while (pqueue_peek(s->d1->unprocessed_rcds.q))
 264             {
 265             dtls1_get_unprocessed_record(s);
 266             if ( ! dtls1_process_record(s))
 267                 return(0);
 268             dtls1_buffer_record(s, &(s->d1->processed_rcds),
 269                 &s->s3->rrec.seq_num);
 270             }
 271         }
 272
 273     /* sync epoch numbers once all the unprocessed records
 274      * have been processed */
 275     s->d1->processed_rcds.epoch = s->d1->r_epoch;
 276     s->d1->unprocessed_rcds.epoch = s->d1->r_epoch + 1;
 277
 278     return(1);
 279     }
 280
 281
 282 #if 0
 283
 284 static int
 285 dtls1_get_buffered_record(SSL *s)
 286         {
 287         pitem *item;
 288         PQ_64BIT priority =
 289                 (((PQ_64BIT)s->d1->handshake_read_seq) << 32) |
 290                 ((PQ_64BIT)s->d1->r_msg_hdr.frag_off);
 291
 292         if ( ! SSL_in_init(s))  /* if we're not (re)negotiating,
 293                                                            nothing buffered */
 294                 return 0;
 295
 296
 297         item = pqueue_peek(s->d1->rcvd_records);
 298         if (item && item->priority == priority)
 299                 {
 300                 /* Check if we've received the record of interest.  It must be
 301                  * a handshake record, since data records as passed up without
 302                  * buffering */
 303                 DTLS1_RECORD_DATA *rdata;
 304                 item = pqueue_pop(s->d1->rcvd_records);
 305                 rdata = (DTLS1_RECORD_DATA *)item->data;
 306
 307                 if (s->s3->rbuf.buf != NULL)
 308                         OPENSSL_free(s->s3->rbuf.buf);
 309
 310                 s->packet = rdata->packet;
 311                 s->packet_length = rdata->packet_length;
 312                 memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
 313                 memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
 314
 315                 OPENSSL_free(item->data);
 316                 pitem_free(item);
 317
 318                 /* s->d1->next_expected_seq_num++; */
 319                 return(1);
 320                 }
 321
 322         return 0;
 323         }
 324
 325 #endif
 326
 327 static int
 328 dtls1_process_record(SSL *s)
 329 {
 330         int i,al;
 331         int enc_err;
 332         SSL_SESSION *sess;
 333         SSL3_RECORD *rr;
 334         unsigned int mac_size, orig_len;
 335         unsigned char md[EVP_MAX_MD_SIZE];
 336
 337         rr= &(s->s3->rrec);
 338     sess = s->session;
 339
 340         /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
 341          * and we have that many bytes in s->packet
 342          */
 343         rr->input= &(s->packet[DTLS1_RT_HEADER_LENGTH]);
 344
 345         /* ok, we can now read from 's->packet' data into 'rr'
 346          * rr->input points at rr->length bytes, which
 347          * need to be copied into rr->data by either
 348          * the decryption or by the decompression
 349          * When the data is 'copied' into the rr->data buffer,
 350          * rr->input will be pointed at the new buffer */
 351
 352         /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
 353          * rr->length bytes of encrypted compressed stuff. */
 354
 355         /* check is not needed I believe */
 356         if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
 357                 {
 358                 al=SSL_AD_RECORD_OVERFLOW;
 359                 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
 360                 goto f_err;
 361                 }
 362
 363         /* decrypt in place in 'rr->input' */
 364         rr->data=rr->input;
 365
 366         enc_err = s->method->ssl3_enc->enc(s,0);
 367         /* enc_err is:
 368          *    0: (in non-constant time) if the record is publically invalid.
 369          *    1: if the padding is valid
 370          *    -1: if the padding is invalid */
 371         if (enc_err == 0)
 372                 {
 373                 /* For DTLS we simply ignore bad packets. */
 374                 rr->length = 0;
 375                 s->packet_length = 0;
 376                 goto err;
 377                 }
 378
 379 #ifdef TLS_DEBUG
 380 printf("dec %d\n",rr->length);
 381 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
 382 printf("\n");
 383 #endif
 384
 385         /* r->length is now the compressed data plus mac */
 386         if ((sess != NULL) &&
 387             (s->enc_read_ctx != NULL) &&
 388             (s->read_hash != NULL))
 389                 {
 390                 /* s->read_hash != NULL => mac_size != -1 */
 391                 unsigned char *mac = NULL;
 392                 unsigned char mac_tmp[EVP_MAX_MD_SIZE];
 393                 mac_size=EVP_MD_size(s->read_hash);
 394                 OPENSSL_assert(mac_size <= EVP_MAX_MD_SIZE);
 395
 396                 /* kludge: *_cbc_remove_padding passes padding length in rr->type */
 397                 orig_len = rr->length+((unsigned int)rr->type>>8);
 398
 399                 /* orig_len is the length of the record before any padding was
 400                  * removed. This is public information, as is the MAC in use,
 401                  * therefore we can safely process the record in a different
 402                  * amount of time if it's too short to possibly contain a MAC.
 403                  */
 404                 if (orig_len < mac_size ||
 405                     /* CBC records must have a padding length byte too. */
 406                     (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE &&
 407                      orig_len < mac_size+1))
 408                         {
 409                         al=SSL_AD_DECODE_ERROR;
 410                         SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_LENGTH_TOO_SHORT);
 411                         goto f_err;
 412                         }
 413
 414                 if (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE)
 415                         {
 416                         /* We update the length so that the TLS header bytes
 417                          * can be constructed correctly but we need to extract
 418                          * the MAC in constant time from within the record,
 419                          * without leaking the contents of the padding bytes.
 420                          * */
 421                         mac = mac_tmp;
 422                         ssl3_cbc_copy_mac(mac_tmp, rr, mac_size, orig_len);
 423                         rr->length -= mac_size;
 424                         }
 425                 else
 426                         {
 427                         /* In this case there's no padding, so |orig_len|
 428                          * equals |rec->length| and we checked that there's
 429                          * enough bytes for |mac_size| above. */
 430                         rr->length -= mac_size;
 431                         mac = &rr->data[rr->length];
 432                         }
 433
 434                 i=s->method->ssl3_enc->mac(s,md,0 /* not send */);
 435                 if (i < 0 || mac == NULL || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0)
 436                         enc_err = -1;
 437                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+mac_size)
 438                         enc_err = -1;
 439                 }
 440
 441         if (enc_err < 0)
 442                 {
 443                 /* decryption failed, silently discard message */
 444                 rr->length = 0;
 445                 s->packet_length = 0;
 446                 goto err;
 447                 }
 448
 449         /* r->length is now just compressed */
 450         if (s->expand != NULL)
 451                 {
 452                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH)
 453                         {
 454                         al=SSL_AD_RECORD_OVERFLOW;
 455                         SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
 456                         goto f_err;
 457                         }
 458                 if (!ssl3_do_uncompress(s))
 459                         {
 460                         al=SSL_AD_DECOMPRESSION_FAILURE;
 461                         SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_BAD_DECOMPRESSION);
 462                         goto f_err;
 463                         }
 464                 }
 465
 466         if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH)
 467                 {
 468                 al=SSL_AD_RECORD_OVERFLOW;
 469                 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
 470                 goto f_err;
 471                 }
 472
 473         rr->off=0;
 474         /* So at this point the following is true
 475          * ssl->s3->rrec.type   is the type of record
 476          * ssl->s3->rrec.length == number of bytes in record
 477          * ssl->s3->rrec.off    == offset to first valid byte
 478          * ssl->s3->rrec.data   == where to take bytes from, increment
 479          *                         after use :-).
 480          */
 481
 482         /* we have pulled in a full packet so zero things */
 483         s->packet_length=0;
 484     dtls1_record_bitmap_update(s, &(s->d1->bitmap));/* Mark receipt of record. */
 485     return(1);
 486
 487 f_err:
 488         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 489 err:
 490         return(0);
 491 }
 492
 493
 494 /* Call this to get a new input record.
 495  * It will return <= 0 if more data is needed, normally due to an error
 496  * or non-blocking IO.
 497  * When it finishes, one packet has been decoded and can be found in
 498  * ssl->s3->rrec.type    - is the type of record
 499  * ssl->s3->rrec.data,   - data
 500  * ssl->s3->rrec.length, - number of bytes
 501  */
 502 /* used only by dtls1_read_bytes */
 503 int dtls1_get_record(SSL *s)
 504         {
 505         int ssl_major,ssl_minor;
 506         int i,n;
 507         SSL3_RECORD *rr;
 508         unsigned char *p = NULL;
 509         unsigned short version;
 510         DTLS1_BITMAP *bitmap;
 511         unsigned int is_next_epoch;
 512
 513         rr= &(s->s3->rrec);
 514
 515     /* The epoch may have changed.  If so, process all the
 516      * pending records.  This is a non-blocking operation. */
 517     dtls1_process_buffered_records(s);
 518
 519         /* if we're renegotiating, then there may be buffered records */
 520         if (dtls1_get_processed_record(s))
 521                 return 1;
 522
 523         /* get something from the wire */
 524 again:
 525         /* check if we have the header */
 526         if (    (s->rstate != SSL_ST_READ_BODY) ||
 527                 (s->packet_length < DTLS1_RT_HEADER_LENGTH))
 528                 {
 529                 n=ssl3_read_n(s, DTLS1_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
 530                 /* read timeout is handled by dtls1_read_bytes */
 531                 if (n <= 0) return(n); /* error or non-blocking */
 532
 533                 /* this packet contained a partial record, dump it */
 534                 if (s->packet_length != DTLS1_RT_HEADER_LENGTH)
 535                         {
 536                         s->packet_length = 0;
 537                         goto again;
 538                         }
 539
 540                 s->rstate=SSL_ST_READ_BODY;
 541
 542                 p=s->packet;
 543
 544                 /* Pull apart the header into the DTLS1_RECORD */
 545                 rr->type= *(p++);
 546                 ssl_major= *(p++);
 547                 ssl_minor= *(p++);
 548                 version=(ssl_major<<8)|ssl_minor;
 549
 550                 /* sequence number is 64 bits, with top 2 bytes = epoch */
 551                 n2s(p,rr->epoch);
 552
 553                 memcpy(&(s->s3->read_sequence[2]), p, 6);
 554                 p+=6;
 555
 556                 n2s(p,rr->length);
 557
 558                 /* Lets check version */
 559                 if (!s->first_packet)
 560                         {
 561                         if (version != s->version && version != DTLS1_BAD_VER)
 562                                 {
 563                                 /* unexpected version, silently discard */
 564                                 rr->length = 0;
 565                                 s->packet_length = 0;
 566                                 goto again;
 567                                 }
 568                         }
 569
 570                 if ((version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
 571                     (version & 0xff00) != (DTLS1_BAD_VER & 0xff00))
 572                         {
 573                         /* wrong version, silently discard record */
 574                         rr->length = 0;
 575                         s->packet_length = 0;
 576                         goto again;
 577                         }
 578
 579                 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
 580                         {
 581                         /* record too long, silently discard it */
 582                         rr->length = 0;
 583                         s->packet_length = 0;
 584                         goto again;
 585                         }
 586
 587                 s->client_version = version;
 588                 /* now s->rstate == SSL_ST_READ_BODY */
 589                 }
 590
 591         /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
 592
 593         if (rr->length > s->packet_length-DTLS1_RT_HEADER_LENGTH)
 594                 {
 595                 /* now s->packet_length == DTLS1_RT_HEADER_LENGTH */
 596                 i=rr->length;
 597                 n=ssl3_read_n(s,i,i,1);
 598                 /* this packet contained a partial record, dump it */
 599                 if ( n != i)
 600                         {
 601                         rr->length = 0;
 602                         s->packet_length = 0;
 603                         goto again;
 604                         }
 605
 606                 /* now n == rr->length,
 607                  * and s->packet_length == DTLS1_RT_HEADER_LENGTH + rr->length */
 608                 }
 609         s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
 610
 611         /* match epochs.  NULL means the packet is dropped on the floor */
 612         bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch);
 613         if ( bitmap == NULL)
 614         {
 615         rr->length = 0;
 616         s->packet_length = 0;  /* dump this record */
 617         goto again;   /* get another record */
 618                 }
 619
 620         /* Check whether this is a repeat, or aged record.
 621          * Don't check if we're listening and this message is
 622          * a ClientHello. They can look as if they're replayed,
 623          * since they arrive from different connections and
 624          * would be dropped unnecessarily.
 625          */
 626         if (!(s->d1->listen && rr->type == SSL3_RT_HANDSHAKE &&
 627                 s->packet_length > DTLS1_RT_HEADER_LENGTH &&
 628                 s->packet[DTLS1_RT_HEADER_LENGTH] == SSL3_MT_CLIENT_HELLO) &&
 629                 ! dtls1_record_replay_check(s, bitmap, &(rr->seq_num)))
 630                 {
 631                 rr->length = 0;
 632                 s->packet_length=0; /* dump this record */
 633                 goto again;     /* get another record */
 634                 }
 635
 636         /* just read a 0 length packet */
 637         if (rr->length == 0) goto again;
 638
 639         /* If this record is from the next epoch (either HM or ALERT),
 640          * and a handshake is currently in progress, buffer it since it
 641          * cannot be processed at this time. However, do not buffer
 642          * anything while listening.
 643          */
 644         if (is_next_epoch)
 645                 {
 646                 if ((SSL_in_init(s) || s->in_handshake) && !s->d1->listen)
 647                         {
 648                         dtls1_buffer_record(s, &(s->d1->unprocessed_rcds), &rr->seq_num);
 649                         }
 650                 rr->length = 0;
 651         s->packet_length = 0;
 652         goto again;
 653         }
 654
 655     if (!dtls1_process_record(s))
 656                 {
 657                 rr->length = 0;
 658                 s->packet_length=0; /* dump this record */
 659                 goto again;     /* get another record */
 660                 }
 661
 662         return(1);
 663
 664         }
 665
 666 /* Return up to 'len' payload bytes received in 'type' records.
 667  * 'type' is one of the following:
 668  *
 669  *   -  SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
 670  *   -  SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
 671  *   -  0 (during a shutdown, no data has to be returned)
 672  *
 673  * If we don't have stored data to work from, read a SSL/TLS record first
 674  * (possibly multiple records if we still don't have anything to return).
 675  *
 676  * This function must handle any surprises the peer may have for us, such as
 677  * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
 678  * a surprise, but handled as if it were), or renegotiation requests.
 679  * Also if record payloads contain fragments too small to process, we store
 680  * them until there is enough for the respective protocol (the record protocol
 681  * may use arbitrary fragmentation and even interleaving):
 682  *     Change cipher spec protocol
 683  *             just 1 byte needed, no need for keeping anything stored
 684  *     Alert protocol
 685  *             2 bytes needed (AlertLevel, AlertDescription)
 686  *     Handshake protocol
 687  *             4 bytes needed (HandshakeType, uint24 length) -- we just have
 688  *             to detect unexpected Client Hello and Hello Request messages
 689  *             here, anything else is handled by higher layers
 690  *     Application data protocol
 691  *             none of our business
 692  */
 693 int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
 694         {
 695         int al,i,j,ret;
 696         unsigned int n;
 697         SSL3_RECORD *rr;
 698         void (*cb)(const SSL *ssl,int type2,int val)=NULL;
 699
 700         if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
 701                 if (!ssl3_setup_buffers(s))
 702                         return(-1);
 703
 704     /* XXX: check what the second '&& type' is about */
 705         if ((type && (type != SSL3_RT_APPLICATION_DATA) &&
 706                 (type != SSL3_RT_HANDSHAKE) && type) ||
 707             (peek && (type != SSL3_RT_APPLICATION_DATA)))
 708                 {
 709                 SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
 710                 return -1;
 711                 }
 712
 713         /* check whether there's a handshake message (client hello?) waiting */
 714         if ( (ret = have_handshake_fragment(s, type, buf, len, peek)))
 715                 return ret;
 716
 717         /* Now s->d1->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
 718
 719         if (!s->in_handshake && SSL_in_init(s))
 720                 {
 721                 /* type == SSL3_RT_APPLICATION_DATA */
 722                 i=s->handshake_func(s);
 723                 if (i < 0) return(i);
 724                 if (i == 0)
 725                         {
 726                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 727                         return(-1);
 728                         }
 729                 }
 730
 731 start:
 732         s->rwstate=SSL_NOTHING;
 733
 734         /* s->s3->rrec.type         - is the type of record
 735          * s->s3->rrec.data,    - data
 736          * s->s3->rrec.off,     - offset into 'data' for next read
 737          * s->s3->rrec.length,  - number of bytes. */
 738         rr = &(s->s3->rrec);
 739
 740         /* We are not handshaking and have no data yet,
 741          * so process data buffered during the last handshake
 742          * in advance, if any.
 743          */
 744         if (s->state == SSL_ST_OK && rr->length == 0)
 745                 {
 746                 pitem *item;
 747                 item = pqueue_pop(s->d1->buffered_app_data.q);
 748                 if (item)
 749                         {
 750                         dtls1_copy_record(s, item);
 751
 752                         OPENSSL_free(item->data);
 753                         pitem_free(item);
 754                         }
 755                 }
 756
 757         /* Check for timeout */
 758         if (dtls1_handle_timeout(s) > 0)
 759                 goto start;
 760
 761         /* get new packet if necessary */
 762         if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
 763                 {
 764                 ret=dtls1_get_record(s);
 765                 if (ret <= 0)
 766                         {
 767                         ret = dtls1_read_failed(s, ret);
 768                         /* anything other than a timeout is an error */
 769                         if (ret <= 0)
 770                                 return(ret);
 771                         else
 772                                 goto start;
 773                         }
 774                 }
 775
 776         if (s->d1->listen && rr->type != SSL3_RT_HANDSHAKE)
 777                 {
 778                 rr->length = 0;
 779                 goto start;
 780                 }
 781
 782         /* we now have a packet which can be read and processed */
 783
 784         if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
 785                                        * reset by ssl3_get_finished */
 786                 && (rr->type != SSL3_RT_HANDSHAKE))
 787                 {
 788                 /* We now have application data between CCS and Finished.
 789                  * Most likely the packets were reordered on their way, so
 790                  * buffer the application data for later processing rather
 791                  * than dropping the connection.
 792                  */
 793                 dtls1_buffer_record(s, &(s->d1->buffered_app_data), &rr->seq_num);
 794                 rr->length = 0;
 795                 goto start;
 796                 }
 797
 798         /* If the other end has shut down, throw anything we read away
 799          * (even in 'peek' mode) */
 800         if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
 801                 {
 802                 rr->length=0;
 803                 s->rwstate=SSL_NOTHING;
 804                 return(0);
 805                 }
 806
 807
 808         if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
 809                 {
 810                 /* make sure that we are not getting application data when we
 811                  * are doing a handshake for the first time */
 812                 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
 813                         (s->enc_read_ctx == NULL))
 814                         {
 815                         al=SSL_AD_UNEXPECTED_MESSAGE;
 816                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
 817                         goto f_err;
 818                         }
 819
 820                 if (len <= 0) return(len);
 821
 822                 if ((unsigned int)len > rr->length)
 823                         n = rr->length;
 824                 else
 825                         n = (unsigned int)len;
 826
 827                 memcpy(buf,&(rr->data[rr->off]),n);
 828                 if (!peek)
 829                         {
 830                         rr->length-=n;
 831                         rr->off+=n;
 832                         if (rr->length == 0)
 833                                 {
 834                                 s->rstate=SSL_ST_READ_HEADER;
 835                                 rr->off=0;
 836                                 }
 837                         }
 838                 return(n);
 839                 }
 840
 841
 842         /* If we get here, then type != rr->type; if we have a handshake
 843          * message, then it was unexpected (Hello Request or Client Hello). */
 844
 845         /* In case of record types for which we have 'fragment' storage,
 846          * fill that so that we can process the data at a fixed place.
 847          */
 848                 {
 849                 unsigned int k, dest_maxlen = 0;
 850                 unsigned char *dest = NULL;
 851                 unsigned int *dest_len = NULL;
 852
 853                 if (rr->type == SSL3_RT_HANDSHAKE)
 854                         {
 855                         dest_maxlen = sizeof s->d1->handshake_fragment;
 856                         dest = s->d1->handshake_fragment;
 857                         dest_len = &s->d1->handshake_fragment_len;
 858                         }
 859                 else if (rr->type == SSL3_RT_ALERT)
 860                         {
 861                         dest_maxlen = sizeof(s->d1->alert_fragment);
 862                         dest = s->d1->alert_fragment;
 863                         dest_len = &s->d1->alert_fragment_len;
 864                         }
 865                 /* else it's a CCS message, or application data or wrong */
 866                 else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC)
 867                         {
 868                         /* Application data while renegotiating
 869                          * is allowed. Try again reading.
 870                          */
 871                         if (rr->type == SSL3_RT_APPLICATION_DATA)
 872                                 {
 873                                 BIO *bio;
 874                                 s->s3->in_read_app_data=2;
 875                                 bio=SSL_get_rbio(s);
 876                                 s->rwstate=SSL_READING;
 877                                 BIO_clear_retry_flags(bio);
 878                                 BIO_set_retry_read(bio);
 879                                 return(-1);
 880                                 }
 881
 882                         /* Not certain if this is the right error handling */
 883                         al=SSL_AD_UNEXPECTED_MESSAGE;
 884                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
 885                         goto f_err;
 886                         }
 887
 888                 if (dest_maxlen > 0)
 889                         {
 890             /* XDTLS:  In a pathalogical case, the Client Hello
 891              *  may be fragmented--don't always expect dest_maxlen bytes */
 892                         if ( rr->length < dest_maxlen)
 893                                 {
 894 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
 895                                 /*
 896                                  * for normal alerts rr->length is 2, while
 897                                  * dest_maxlen is 7 if we were to handle this
 898                                  * non-existing alert...
 899                                  */
 900                                 FIX ME
 901 #endif
 902                                 s->rstate=SSL_ST_READ_HEADER;
 903                                 rr->length = 0;
 904                                 goto start;
 905                                 }
 906
 907                         /* now move 'n' bytes: */
 908                         for ( k = 0; k < dest_maxlen; k++)
 909                                 {
 910                                 dest[k] = rr->data[rr->off++];
 911                                 rr->length--;
 912                                 }
 913                         *dest_len = dest_maxlen;
 914                         }
 915                 }
 916
 917         /* s->d1->handshake_fragment_len == 12  iff  rr->type == SSL3_RT_HANDSHAKE;
 918          * s->d1->alert_fragment_len == 7      iff  rr->type == SSL3_RT_ALERT.
 919          * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
 920
 921         /* If we are a client, check for an incoming 'Hello Request': */
 922         if ((!s->server) &&
 923                 (s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
 924                 (s->d1->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
 925                 (s->session != NULL) && (s->session->cipher != NULL))
 926                 {
 927                 s->d1->handshake_fragment_len = 0;
 928
 929                 if ((s->d1->handshake_fragment[1] != 0) ||
 930                         (s->d1->handshake_fragment[2] != 0) ||
 931                         (s->d1->handshake_fragment[3] != 0))
 932                         {
 933                         al=SSL_AD_DECODE_ERROR;
 934                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
 935                         goto err;
 936                         }
 937
 938                 /* no need to check sequence number on HELLO REQUEST messages */
 939
 940                 if (s->msg_callback)
 941                         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
 942                                 s->d1->handshake_fragment, 4, s, s->msg_callback_arg);
 943
 944                 if (SSL_is_init_finished(s) &&
 945                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
 946                         !s->s3->renegotiate)
 947                         {
 948                         s->d1->handshake_read_seq++;
 949                         ssl3_renegotiate(s);
 950                         if (ssl3_renegotiate_check(s))
 951                                 {
 952                                 i=s->handshake_func(s);
 953                                 if (i < 0) return(i);
 954                                 if (i == 0)
 955                                         {
 956                                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 957                                         return(-1);
 958                                         }
 959
 960                                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
 961                                         {
 962                                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
 963                                                 {
 964                                                 BIO *bio;
 965                                                 /* In the case where we try to read application data,
 966                                                  * but we trigger an SSL handshake, we return -1 with
 967                                                  * the retry option set.  Otherwise renegotiation may
 968                                                  * cause nasty problems in the blocking world */
 969                                                 s->rwstate=SSL_READING;
 970                                                 bio=SSL_get_rbio(s);
 971                                                 BIO_clear_retry_flags(bio);
 972                                                 BIO_set_retry_read(bio);
 973                                                 return(-1);
 974                                                 }
 975                                         }
 976                                 }
 977                         }
 978                 /* we either finished a handshake or ignored the request,
 979                  * now try again to obtain the (application) data we were asked for */
 980                 goto start;
 981                 }
 982
 983         if (s->d1->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH)
 984                 {
 985                 int alert_level = s->d1->alert_fragment[0];
 986                 int alert_descr = s->d1->alert_fragment[1];
 987
 988                 s->d1->alert_fragment_len = 0;
 989
 990                 if (s->msg_callback)
 991                         s->msg_callback(0, s->version, SSL3_RT_ALERT,
 992                                 s->d1->alert_fragment, 2, s, s->msg_callback_arg);
 993
 994                 if (s->info_callback != NULL)
 995                         cb=s->info_callback;
 996                 else if (s->ctx->info_callback != NULL)
 997                         cb=s->ctx->info_callback;
 998
 999                 if (cb != NULL)
1000                         {
1001                         j = (alert_level << 8) | alert_descr;
1002                         cb(s, SSL_CB_READ_ALERT, j);
1003                         }
1004
1005                 if (alert_level == 1) /* warning */
1006                         {
1007                         s->s3->warn_alert = alert_descr;
1008                         if (alert_descr == SSL_AD_CLOSE_NOTIFY)
1009                                 {
1010                                 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
1011                                 return(0);
1012                                 }
1013 #if 0
1014             /* XXX: this is a possible improvement in the future */
1015                         /* now check if it's a missing record */
1016                         if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
1017                                 {
1018                                 unsigned short seq;
1019                                 unsigned int frag_off;
1020                                 unsigned char *p = &(s->d1->alert_fragment[2]);
1021
1022                                 n2s(p, seq);
1023                                 n2l3(p, frag_off);
1024
1025                                 dtls1_retransmit_message(s,
1026                                                                                  dtls1_get_queue_priority(frag->msg_header.seq, 0),
1027                                                                                  frag_off, &found);
1028                                 if ( ! found  && SSL_in_init(s))
1029                                         {
1030                                         /* fprintf( stderr,"in init = %d\n", SSL_in_init(s)); */
1031                                         /* requested a message not yet sent,
1032                                            send an alert ourselves */
1033                                         ssl3_send_alert(s,SSL3_AL_WARNING,
1034                                                 DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
1035                                         }
1036                                 }
1037 #endif
1038                         }
1039                 else if (alert_level == 2) /* fatal */
1040                         {
1041                         char tmp[16];
1042
1043                         s->rwstate=SSL_NOTHING;
1044                         s->s3->fatal_alert = alert_descr;
1045                         SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1046                         BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1047                         ERR_add_error_data(2,"SSL alert number ",tmp);
1048                         s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1049                         SSL_CTX_remove_session(s->ctx,s->session);
1050                         return(0);
1051                         }
1052                 else
1053                         {
1054                         al=SSL_AD_ILLEGAL_PARAMETER;
1055                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1056                         goto f_err;
1057                         }
1058
1059                 goto start;
1060                 }
1061
1062         if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1063                 {
1064                 s->rwstate=SSL_NOTHING;
1065                 rr->length=0;
1066                 return(0);
1067                 }
1068
1069         if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1070                 {
1071                 struct ccs_header_st ccs_hdr;
1072                 unsigned int ccs_hdr_len = DTLS1_CCS_HEADER_LENGTH;
1073
1074                 dtls1_get_ccs_header(rr->data, &ccs_hdr);
1075
1076                 /* 'Change Cipher Spec' is just a single byte, so we know
1077                  * exactly what the record payload has to look like */
1078                 /* XDTLS: check that epoch is consistent */
1079                 if (s->client_version == DTLS1_BAD_VER || s->version == DTLS1_BAD_VER)
1080                         ccs_hdr_len = 3;
1081
1082                 if ((rr->length != ccs_hdr_len) || (rr->off != 0) || (rr->data[0] != SSL3_MT_CCS))
1083                         {
1084                         i=SSL_AD_ILLEGAL_PARAMETER;
1085                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1086                         goto err;
1087                         }
1088
1089                 rr->length=0;
1090
1091                 if (s->msg_callback)
1092                         s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,
1093                                 rr->data, 1, s, s->msg_callback_arg);
1094
1095                 /* We can't process a CCS now, because previous handshake
1096                  * messages are still missing, so just drop it.
1097                  */
1098                 if (!s->d1->change_cipher_spec_ok)
1099                         {
1100                         goto start;
1101                         }
1102
1103                 s->d1->change_cipher_spec_ok = 0;
1104
1105                 s->s3->change_cipher_spec=1;
1106                 if (!ssl3_do_change_cipher_spec(s))
1107                         goto err;
1108
1109                 /* do this whenever CCS is processed */
1110                 dtls1_reset_seq_numbers(s, SSL3_CC_READ);
1111
1112                 if (s->client_version == DTLS1_BAD_VER)
1113                         s->d1->handshake_read_seq++;
1114
1115                 goto start;
1116                 }
1117
1118         /* Unexpected handshake message (Client Hello, or protocol violation) */
1119         if ((s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
1120                 !s->in_handshake)
1121                 {
1122                 struct hm_header_st msg_hdr;
1123
1124                 /* this may just be a stale retransmit */
1125                 dtls1_get_message_header(rr->data, &msg_hdr);
1126                 if( rr->epoch != s->d1->r_epoch)
1127                         {
1128                         rr->length = 0;
1129                         goto start;
1130                         }
1131
1132                 /* If we are server, we may have a repeated FINISHED of the
1133                  * client here, then retransmit our CCS and FINISHED.
1134                  */
1135                 if (msg_hdr.type == SSL3_MT_FINISHED)
1136                         {
1137                         if (dtls1_check_timeout_num(s) < 0)
1138                                 return -1;
1139
1140                         dtls1_retransmit_buffered_messages(s);
1141                         rr->length = 0;
1142                         goto start;
1143                         }
1144
1145                 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1146                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1147                         {
1148 #if 0 /* worked only because C operator preferences are not as expected (and
1149        * because this is not really needed for clients except for detecting
1150        * protocol violations): */
1151                         s->state=SSL_ST_BEFORE|(s->server)
1152                                 ?SSL_ST_ACCEPT
1153                                 :SSL_ST_CONNECT;
1154 #else
1155                         s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1156 #endif
1157                         s->new_session=1;
1158                         }
1159                 i=s->handshake_func(s);
1160                 if (i < 0) return(i);
1161                 if (i == 0)
1162                         {
1163                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1164                         return(-1);
1165                         }
1166
1167                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1168                         {
1169                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1170                                 {
1171                                 BIO *bio;
1172                                 /* In the case where we try to read application data,
1173                                  * but we trigger an SSL handshake, we return -1 with
1174                                  * the retry option set.  Otherwise renegotiation may
1175                                  * cause nasty problems in the blocking world */
1176                                 s->rwstate=SSL_READING;
1177                                 bio=SSL_get_rbio(s);
1178                                 BIO_clear_retry_flags(bio);
1179                                 BIO_set_retry_read(bio);
1180                                 return(-1);
1181                                 }
1182                         }
1183                 goto start;
1184                 }
1185
1186         switch (rr->type)
1187                 {
1188         default:
1189 #ifndef OPENSSL_NO_TLS
1190                 /* TLS just ignores unknown message types */
1191                 if (s->version == TLS1_VERSION)
1192                         {
1193                         rr->length = 0;
1194                         goto start;
1195                         }
1196 #endif
1197                 al=SSL_AD_UNEXPECTED_MESSAGE;
1198                 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1199                 goto f_err;
1200         case SSL3_RT_CHANGE_CIPHER_SPEC:
1201         case SSL3_RT_ALERT:
1202         case SSL3_RT_HANDSHAKE:
1203                 /* we already handled all of these, with the possible exception
1204                  * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1205                  * should not happen when type != rr->type */
1206                 al=SSL_AD_UNEXPECTED_MESSAGE;
1207                 SSLerr(SSL_F_DTLS1_READ_BYTES,ERR_R_INTERNAL_ERROR);
1208                 goto f_err;
1209         case SSL3_RT_APPLICATION_DATA:
1210                 /* At this point, we were expecting handshake data,
1211                  * but have application data.  If the library was
1212                  * running inside ssl3_read() (i.e. in_read_app_data
1213                  * is set) and it makes sense to read application data
1214                  * at this point (session renegotiation not yet started),
1215                  * we will indulge it.
1216                  */
1217                 if (s->s3->in_read_app_data &&
1218                         (s->s3->total_renegotiations != 0) &&
1219                         ((
1220                                 (s->state & SSL_ST_CONNECT) &&
1221                                 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1222                                 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1223                                 ) || (
1224                                         (s->state & SSL_ST_ACCEPT) &&
1225                                         (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1226                                         (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1227                                         )
1228                                 ))
1229                         {
1230                         s->s3->in_read_app_data=2;
1231                         return(-1);
1232                         }
1233                 else
1234                         {
1235                         al=SSL_AD_UNEXPECTED_MESSAGE;
1236                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1237                         goto f_err;
1238                         }
1239                 }
1240         /* not reached */
1241
1242 f_err:
1243         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1244 err:
1245         return(-1);
1246         }
1247
1248 int
1249 dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len)
1250         {
1251         int i;
1252
1253         if (SSL_in_init(s) && !s->in_handshake)
1254                 {
1255                 i=s->handshake_func(s);
1256                 if (i < 0) return(i);
1257                 if (i == 0)
1258                         {
1259                         SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1260                         return -1;
1261                         }
1262                 }
1263
1264         if (len > SSL3_RT_MAX_PLAIN_LENGTH)
1265                 {
1266                         SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_DTLS_MESSAGE_TOO_BIG);
1267                         return -1;
1268                 }
1269
1270         i = dtls1_write_bytes(s, type, buf_, len);
1271         return i;
1272         }
1273
1274
1275         /* this only happens when a client hello is received and a handshake
1276          * is started. */
1277 static int
1278 have_handshake_fragment(SSL *s, int type, unsigned char *buf,
1279         int len, int peek)
1280         {
1281
1282         if ((type == SSL3_RT_HANDSHAKE) && (s->d1->handshake_fragment_len > 0))
1283                 /* (partially) satisfy request from storage */
1284                 {
1285                 unsigned char *src = s->d1->handshake_fragment;
1286                 unsigned char *dst = buf;
1287                 unsigned int k,n;
1288
1289                 /* peek == 0 */
1290                 n = 0;
1291                 while ((len > 0) && (s->d1->handshake_fragment_len > 0))
1292                         {
1293                         *dst++ = *src++;
1294                         len--; s->d1->handshake_fragment_len--;
1295                         n++;
1296                         }
1297                 /* move any remaining fragment bytes: */
1298                 for (k = 0; k < s->d1->handshake_fragment_len; k++)
1299                         s->d1->handshake_fragment[k] = *src++;
1300                 return n;
1301                 }
1302
1303         return 0;
1304         }
1305
1306
1307
1308
1309 /* Call this to write data in records of type 'type'
1310  * It will return <= 0 if not all data has been sent or non-blocking IO.
1311  */
1312 int dtls1_write_bytes(SSL *s, int type, const void *buf, int len)
1313         {
1314         int i;
1315
1316         OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH);
1317         s->rwstate=SSL_NOTHING;
1318         i=do_dtls1_write(s, type, buf, len, 0);
1319         return i;
1320         }
1321
1322 int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len, int create_empty_fragment)
1323         {
1324         unsigned char *p,*pseq;
1325         int i,mac_size,clear=0;
1326         int prefix_len = 0;
1327         SSL3_RECORD *wr;
1328         SSL3_BUFFER *wb;
1329         SSL_SESSION *sess;
1330         int bs;
1331
1332         /* first check if there is a SSL3_BUFFER still being written
1333          * out.  This will happen with non blocking IO */
1334         if (s->s3->wbuf.left != 0)
1335                 {
1336                 OPENSSL_assert(0); /* XDTLS:  want to see if we ever get here */
1337                 return(ssl3_write_pending(s,type,buf,len));
1338                 }
1339
1340         /* If we have an alert to send, lets send it */
1341         if (s->s3->alert_dispatch)
1342                 {
1343                 i=s->method->ssl_dispatch_alert(s);
1344                 if (i <= 0)
1345                         return(i);
1346                 /* if it went, fall through and send more stuff */
1347                 }
1348
1349         if (len == 0 && !create_empty_fragment)
1350                 return 0;
1351
1352         wr= &(s->s3->wrec);
1353         wb= &(s->s3->wbuf);
1354         sess=s->session;
1355
1356         if (    (sess == NULL) ||
1357                 (s->enc_write_ctx == NULL) ||
1358                 (s->write_hash == NULL))
1359                 clear=1;
1360
1361         if (clear)
1362                 mac_size=0;
1363         else
1364                 mac_size=EVP_MD_size(s->write_hash);
1365
1366         /* DTLS implements explicit IV, so no need for empty fragments */
1367 #if 0
1368         /* 'create_empty_fragment' is true only when this function calls itself */
1369         if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done
1370             && SSL_version(s) != DTLS1_VERSION && SSL_version(s) != DTLS1_BAD_VER)
1371                 {
1372                 /* countermeasure against known-IV weakness in CBC ciphersuites
1373                  * (see http://www.openssl.org/~bodo/tls-cbc.txt)
1374                  */
1375
1376                 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
1377                         {
1378                         /* recursive function call with 'create_empty_fragment' set;
1379                          * this prepares and buffers the data for an empty fragment
1380                          * (these 'prefix_len' bytes are sent out later
1381                          * together with the actual payload) */
1382                         prefix_len = s->method->do_ssl_write(s, type, buf, 0, 1);
1383                         if (prefix_len <= 0)
1384                                 goto err;
1385
1386                         if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE)
1387                                 {
1388                                 /* insufficient space */
1389                                 SSLerr(SSL_F_DO_DTLS1_WRITE, ERR_R_INTERNAL_ERROR);
1390                                 goto err;
1391                                 }
1392                         }
1393
1394                 s->s3->empty_fragment_done = 1;
1395                 }
1396 #endif
1397
1398         p = wb->buf + prefix_len;
1399
1400         /* write the header */
1401
1402         *(p++)=type&0xff;
1403         wr->type=type;
1404
1405         if (s->client_version == DTLS1_BAD_VER)
1406                 *(p++) = DTLS1_BAD_VER>>8,
1407                 *(p++) = DTLS1_BAD_VER&0xff;
1408         else
1409                 *(p++)=(s->version>>8),
1410                 *(p++)=s->version&0xff;
1411
1412         /* field where we are to write out packet epoch, seq num and len */
1413         pseq=p;
1414         p+=10;
1415
1416         /* lets setup the record stuff. */
1417
1418         /* Make space for the explicit IV in case of CBC.
1419          * (this is a bit of a boundary violation, but what the heck).
1420          */
1421         if ( s->enc_write_ctx &&
1422                 (EVP_CIPHER_mode( s->enc_write_ctx->cipher ) & EVP_CIPH_CBC_MODE))
1423                 bs = EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
1424         else
1425                 bs = 0;
1426
1427         wr->data=p + bs;  /* make room for IV in case of CBC */
1428         wr->length=(int)len;
1429         wr->input=(unsigned char *)buf;
1430
1431         /* we now 'read' from wr->input, wr->length bytes into
1432          * wr->data */
1433
1434         /* first we compress */
1435         if (s->compress != NULL)
1436                 {
1437                 if (!ssl3_do_compress(s))
1438                         {
1439                         SSLerr(SSL_F_DO_DTLS1_WRITE,SSL_R_COMPRESSION_FAILURE);
1440                         goto err;
1441                         }
1442                 }
1443         else
1444                 {
1445                 memcpy(wr->data,wr->input,wr->length);
1446                 wr->input=wr->data;
1447                 }
1448
1449         /* we should still have the output to wr->data and the input
1450          * from wr->input.  Length should be wr->length.
1451          * wr->data still points in the wb->buf */
1452
1453         if (mac_size != 0)
1454                 {
1455                 s->method->ssl3_enc->mac(s,&(p[wr->length + bs]),1);
1456                 wr->length+=mac_size;
1457                 }
1458
1459         /* this is true regardless of mac size */
1460         wr->input=p;
1461         wr->data=p;
1462
1463
1464         /* ssl3_enc can only have an error on read */
1465         if (bs) /* bs != 0 in case of CBC */
1466                 {
1467                 RAND_pseudo_bytes(p,bs);
1468                 /* master IV and last CBC residue stand for
1469                  * the rest of randomness */
1470                 wr->length += bs;
1471                 }
1472
1473         s->method->ssl3_enc->enc(s,1);
1474
1475         /* record length after mac and block padding */
1476 /*      if (type == SSL3_RT_APPLICATION_DATA ||
1477         (type == SSL3_RT_ALERT && ! SSL_in_init(s))) */
1478
1479         /* there's only one epoch between handshake and app data */
1480
1481         s2n(s->d1->w_epoch, pseq);
1482
1483         /* XDTLS: ?? */
1484 /*      else
1485         s2n(s->d1->handshake_epoch, pseq); */
1486
1487         memcpy(pseq, &(s->s3->write_sequence[2]), 6);
1488         pseq+=6;
1489         s2n(wr->length,pseq);
1490
1491         /* we should now have
1492          * wr->data pointing to the encrypted data, which is
1493          * wr->length long */
1494         wr->type=type; /* not needed but helps for debugging */
1495         wr->length+=DTLS1_RT_HEADER_LENGTH;
1496
1497 #if 0  /* this is now done at the message layer */
1498         /* buffer the record, making it easy to handle retransmits */
1499         if ( type == SSL3_RT_HANDSHAKE || type == SSL3_RT_CHANGE_CIPHER_SPEC)
1500                 dtls1_buffer_record(s, wr->data, wr->length,
1501                         *((PQ_64BIT *)&(s->s3->write_sequence[0])));
1502 #endif
1503
1504         ssl3_record_sequence_update(&(s->s3->write_sequence[0]));
1505
1506         if (create_empty_fragment)
1507                 {
1508                 /* we are in a recursive call;
1509                  * just return the length, don't write out anything here
1510                  */
1511                 return wr->length;
1512                 }
1513
1514         /* now let's set up wb */
1515         wb->left = prefix_len + wr->length;
1516         wb->offset = 0;
1517
1518         /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
1519         s->s3->wpend_tot=len;
1520         s->s3->wpend_buf=buf;
1521         s->s3->wpend_type=type;
1522         s->s3->wpend_ret=len;
1523
1524         /* we now just need to write the buffer */
1525         return ssl3_write_pending(s,type,buf,len);
1526 err:
1527         return -1;
1528         }
1529
1530
1531
1532 static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap,
1533         PQ_64BIT *seq_num)
1534         {
1535 #if PQ_64BIT_IS_INTEGER
1536         PQ_64BIT mask = 0x0000000000000001L;
1537 #endif
1538         PQ_64BIT rcd_num, tmp;
1539
1540         pq_64bit_init(&rcd_num);
1541         pq_64bit_init(&tmp);
1542
1543         /* this is the sequence number for the record just read */
1544         pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8);
1545
1546
1547         if (pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) ||
1548                 pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num)))
1549                 {
1550                 pq_64bit_assign(seq_num, &rcd_num);
1551                 pq_64bit_free(&rcd_num);
1552                 pq_64bit_free(&tmp);
1553                 return 1;  /* this record is new */
1554                 }
1555
1556         pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
1557
1558         if ( pq_64bit_get_word(&tmp) > bitmap->length)
1559                 {
1560                 pq_64bit_free(&rcd_num);
1561                 pq_64bit_free(&tmp);
1562                 return 0;  /* stale, outside the window */
1563                 }
1564
1565 #if PQ_64BIT_IS_BIGNUM
1566         {
1567         int offset;
1568         pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
1569         pq_64bit_sub_word(&tmp, 1);
1570         offset = pq_64bit_get_word(&tmp);
1571         if ( pq_64bit_is_bit_set(&(bitmap->map), offset))
1572                 {
1573                 pq_64bit_free(&rcd_num);
1574                 pq_64bit_free(&tmp);
1575                 return 0;
1576                 }
1577         }
1578 #else
1579         mask <<= (bitmap->max_seq_num - rcd_num - 1);
1580         if (bitmap->map & mask)
1581                 return 0; /* record previously received */
1582 #endif
1583
1584         pq_64bit_assign(seq_num, &rcd_num);
1585         pq_64bit_free(&rcd_num);
1586         pq_64bit_free(&tmp);
1587         return 1;
1588         }
1589
1590
1591 static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap)
1592         {
1593         unsigned int shift;
1594         PQ_64BIT rcd_num;
1595         PQ_64BIT tmp;
1596         PQ_64BIT_CTX *ctx;
1597
1598         pq_64bit_init(&rcd_num);
1599         pq_64bit_init(&tmp);
1600
1601         pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8);
1602
1603         /* unfortunate code complexity due to 64-bit manipulation support
1604          * on 32-bit machines */
1605         if ( pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) ||
1606                 pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num)))
1607                 {
1608                 pq_64bit_sub(&tmp, &rcd_num, &(bitmap->max_seq_num));
1609                 pq_64bit_add_word(&tmp, 1);
1610
1611                 shift = (unsigned int)pq_64bit_get_word(&tmp);
1612
1613                 pq_64bit_lshift(&(tmp), &(bitmap->map), shift);
1614                 pq_64bit_assign(&(bitmap->map), &tmp);
1615
1616                 pq_64bit_set_bit(&(bitmap->map), 0);
1617                 pq_64bit_add_word(&rcd_num, 1);
1618                 pq_64bit_assign(&(bitmap->max_seq_num), &rcd_num);
1619
1620                 pq_64bit_assign_word(&tmp, 1);
1621                 pq_64bit_lshift(&tmp, &tmp, bitmap->length);
1622                 ctx = pq_64bit_ctx_new(&ctx);
1623                 pq_64bit_mod(&(bitmap->map), &(bitmap->map), &tmp, ctx);
1624                 pq_64bit_ctx_free(ctx);
1625                 }
1626         else
1627                 {
1628                 pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
1629                 pq_64bit_sub_word(&tmp, 1);
1630                 shift = (unsigned int)pq_64bit_get_word(&tmp);
1631
1632                 pq_64bit_set_bit(&(bitmap->map), shift);
1633                 }
1634
1635         pq_64bit_free(&rcd_num);
1636         pq_64bit_free(&tmp);
1637         }
1638
1639
1640 int dtls1_dispatch_alert(SSL *s)
1641         {
1642         int i,j;
1643         void (*cb)(const SSL *ssl,int type,int val)=NULL;
1644         unsigned char buf[DTLS1_AL_HEADER_LENGTH];
1645         unsigned char *ptr = &buf[0];
1646
1647         s->s3->alert_dispatch=0;
1648
1649         memset(buf, 0x00, sizeof(buf));
1650         *ptr++ = s->s3->send_alert[0];
1651         *ptr++ = s->s3->send_alert[1];
1652
1653 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1654         if (s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
1655                 {
1656                 s2n(s->d1->handshake_read_seq, ptr);
1657 #if 0
1658                 if ( s->d1->r_msg_hdr.frag_off == 0)  /* waiting for a new msg */
1659
1660                 else
1661                         s2n(s->d1->r_msg_hdr.seq, ptr); /* partial msg read */
1662 #endif
1663
1664 #if 0
1665                 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);
1666 #endif
1667                 l2n3(s->d1->r_msg_hdr.frag_off, ptr);
1668                 }
1669 #endif
1670
1671         i = do_dtls1_write(s, SSL3_RT_ALERT, &buf[0], sizeof(buf), 0);
1672         if (i <= 0)
1673                 {
1674                 s->s3->alert_dispatch=1;
1675                 /* fprintf( stderr, "not done with alert\n" ); */
1676                 }
1677         else
1678                 {
1679                 if (s->s3->send_alert[0] == SSL3_AL_FATAL
1680 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1681                     || s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1682 #endif
1683                    )
1684                         (void)BIO_flush(s->wbio);
1685
1686                 if (s->msg_callback)
1687                         s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert,
1688                                 2, s, s->msg_callback_arg);
1689
1690                 if (s->info_callback != NULL)
1691                         cb=s->info_callback;
1692                 else if (s->ctx->info_callback != NULL)
1693                         cb=s->ctx->info_callback;
1694
1695                 if (cb != NULL)
1696                         {
1697                         j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1698                         cb(s,SSL_CB_WRITE_ALERT,j);
1699                         }
1700                 }
1701         return(i);
1702         }
1703
1704
1705 static DTLS1_BITMAP *
1706 dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, unsigned int *is_next_epoch)
1707     {
1708
1709     *is_next_epoch = 0;
1710
1711     /* In current epoch, accept HM, CCS, DATA, & ALERT */
1712     if (rr->epoch == s->d1->r_epoch)
1713         return &s->d1->bitmap;
1714
1715     /* Only HM and ALERT messages can be from the next epoch */
1716     else if (rr->epoch == (unsigned long)(s->d1->r_epoch + 1) &&
1717         (rr->type == SSL3_RT_HANDSHAKE ||
1718             rr->type == SSL3_RT_ALERT))
1719         {
1720         *is_next_epoch = 1;
1721         return &s->d1->next_bitmap;
1722         }
1723
1724     return NULL;
1725     }
1726
1727 #if 0
1728 static int
1729 dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, unsigned short *priority,
1730         unsigned long *offset)
1731         {
1732
1733         /* alerts are passed up immediately */
1734         if ( rr->type == SSL3_RT_APPLICATION_DATA ||
1735                 rr->type == SSL3_RT_ALERT)
1736                 return 0;
1737
1738         /* Only need to buffer if a handshake is underway.
1739          * (this implies that Hello Request and Client Hello are passed up
1740          * immediately) */
1741         if ( SSL_in_init(s))
1742                 {
1743                 unsigned char *data = rr->data;
1744                 /* need to extract the HM/CCS sequence number here */
1745                 if ( rr->type == SSL3_RT_HANDSHAKE ||
1746                         rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1747                         {
1748                         unsigned short seq_num;
1749                         struct hm_header_st msg_hdr;
1750                         struct ccs_header_st ccs_hdr;
1751
1752                         if ( rr->type == SSL3_RT_HANDSHAKE)
1753                                 {
1754                                 dtls1_get_message_header(data, &msg_hdr);
1755                                 seq_num = msg_hdr.seq;
1756                                 *offset = msg_hdr.frag_off;
1757                                 }
1758                         else
1759                                 {
1760                                 dtls1_get_ccs_header(data, &ccs_hdr);
1761                                 seq_num = ccs_hdr.seq;
1762                                 *offset = 0;
1763                                 }
1764
1765                         /* this is either a record we're waiting for, or a
1766                          * retransmit of something we happened to previously
1767                          * receive (higher layers will drop the repeat silently */
1768                         if ( seq_num < s->d1->handshake_read_seq)
1769                                 return 0;
1770                         if (rr->type == SSL3_RT_HANDSHAKE &&
1771                                 seq_num == s->d1->handshake_read_seq &&
1772                                 msg_hdr.frag_off < s->d1->r_msg_hdr.frag_off)
1773                                 return 0;
1774                         else if ( seq_num == s->d1->handshake_read_seq &&
1775                                 (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC ||
1776                                         msg_hdr.frag_off == s->d1->r_msg_hdr.frag_off))
1777                                 return 0;
1778                         else
1779                                 {
1780                                 *priority = seq_num;
1781                                 return 1;
1782                                 }
1783                         }
1784                 else /* unknown record type */
1785                         return 0;
1786                 }
1787
1788         return 0;
1789         }
1790 #endif
1791
1792 void
1793 dtls1_reset_seq_numbers(SSL *s, int rw)
1794         {
1795         unsigned char *seq;
1796         unsigned int seq_bytes = sizeof(s->s3->read_sequence);
1797
1798         if ( rw & SSL3_CC_READ)
1799                 {
1800                 seq = s->s3->read_sequence;
1801                 s->d1->r_epoch++;
1802
1803                 pq_64bit_assign(&(s->d1->bitmap.map), &(s->d1->next_bitmap.map));
1804                 s->d1->bitmap.length = s->d1->next_bitmap.length;
1805                 pq_64bit_assign(&(s->d1->bitmap.max_seq_num),
1806                         &(s->d1->next_bitmap.max_seq_num));
1807
1808                 pq_64bit_free(&(s->d1->next_bitmap.map));
1809                 pq_64bit_free(&(s->d1->next_bitmap.max_seq_num));
1810                 memset(&(s->d1->next_bitmap), 0x00, sizeof(DTLS1_BITMAP));
1811                 pq_64bit_init(&(s->d1->next_bitmap.map));
1812                 pq_64bit_init(&(s->d1->next_bitmap.max_seq_num));
1813                 }
1814         else
1815                 {
1816                 seq = s->s3->write_sequence;
1817                 memcpy(s->d1->last_write_sequence, seq, sizeof(s->s3->write_sequence));
1818                 s->d1->w_epoch++;
1819                 }
1820
1821         memset(seq, 0x00, seq_bytes);
1822         }
1823
1824 #if PQ_64BIT_IS_INTEGER
1825 static PQ_64BIT
1826 bytes_to_long_long(unsigned char *bytes, PQ_64BIT *num)
1827        {
1828        PQ_64BIT _num;
1829
1830        _num = (((PQ_64BIT)bytes[0]) << 56) |
1831                (((PQ_64BIT)bytes[1]) << 48) |
1832                (((PQ_64BIT)bytes[2]) << 40) |
1833                (((PQ_64BIT)bytes[3]) << 32) |
1834                (((PQ_64BIT)bytes[4]) << 24) |
1835                (((PQ_64BIT)bytes[5]) << 16) |
1836                (((PQ_64BIT)bytes[6]) <<  8) |
1837                (((PQ_64BIT)bytes[7])      );
1838
1839            *num = _num ;
1840        return _num;
1841        }
1842 #endif