ssl/d1_pkt.c

   1 /* ssl/d1_pkt.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1998-2005 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@openssl.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include <errno.h>
 118 #define USE_SOCKETS
 119 #include "ssl_locl.h"
 120 #include <openssl/evp.h>
 121 #include <openssl/buffer.h>
 122 #include <openssl/pqueue.h>
 123 #include <openssl/rand.h>
 124
 125 static int have_handshake_fragment(SSL *s, int type, unsigned char *buf,
 126         int len, int peek);
 127 static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap,
 128         PQ_64BIT *seq_num);
 129 static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap);
 130 static DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr,
 131     unsigned int *is_next_epoch);
 132 #if 0
 133 static int dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr,
 134         unsigned short *priority, unsigned long *offset);
 135 #endif
 136 static int dtls1_buffer_record(SSL *s, record_pqueue *q,
 137         PQ_64BIT *priority);
 138 static int dtls1_process_record(SSL *s);
 139 #if PQ_64BIT_IS_INTEGER
 140 static PQ_64BIT bytes_to_long_long(unsigned char *bytes, PQ_64BIT *num);
 141 #endif
 142 static void dtls1_clear_timeouts(SSL *s);
 143
 144 /* copy buffered record into SSL structure */
 145 static int
 146 dtls1_copy_record(SSL *s, pitem *item)
 147     {
 148     DTLS1_RECORD_DATA *rdata;
 149
 150     rdata = (DTLS1_RECORD_DATA *)item->data;
 151
 152     if (s->s3->rbuf.buf != NULL)
 153         OPENSSL_free(s->s3->rbuf.buf);
 154
 155     s->packet = rdata->packet;
 156     s->packet_length = rdata->packet_length;
 157     memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
 158     memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
 159
 160         /* Set proper sequence number for mac calculation */
 161         memcpy(&(s->s3->read_sequence[2]), &(rdata->packet[5]), 6);
 162
 163     return(1);
 164     }
 165
 166
 167 static int
 168 dtls1_buffer_record(SSL *s, record_pqueue *queue, PQ_64BIT *priority)
 169 {
 170     DTLS1_RECORD_DATA *rdata;
 171         pitem *item;
 172
 173         /* Limit the size of the queue to prevent DOS attacks */
 174         if (pqueue_size(queue->q) >= 100)
 175                 return 0;
 176
 177         rdata = OPENSSL_malloc(sizeof(DTLS1_RECORD_DATA));
 178         item = pitem_new(*priority, rdata);
 179         if (rdata == NULL || item == NULL)
 180                 {
 181                 if (rdata != NULL) OPENSSL_free(rdata);
 182                 if (item != NULL) pitem_free(item);
 183
 184                 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
 185                 return(0);
 186                 }
 187
 188         rdata->packet = s->packet;
 189         rdata->packet_length = s->packet_length;
 190         memcpy(&(rdata->rbuf), &(s->s3->rbuf), sizeof(SSL3_BUFFER));
 191         memcpy(&(rdata->rrec), &(s->s3->rrec), sizeof(SSL3_RECORD));
 192
 193         item->data = rdata;
 194
 195         /* insert should not fail, since duplicates are dropped */
 196         if (pqueue_insert(queue->q, item) == NULL)
 197                 {
 198                 OPENSSL_free(rdata);
 199                 pitem_free(item);
 200                 return(0);
 201                 }
 202
 203         s->packet = NULL;
 204         s->packet_length = 0;
 205         memset(&(s->s3->rbuf), 0, sizeof(SSL3_BUFFER));
 206         memset(&(s->s3->rrec), 0, sizeof(SSL3_RECORD));
 207
 208         if (!ssl3_setup_buffers(s))
 209                 {
 210                 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
 211                 OPENSSL_free(rdata);
 212                 pitem_free(item);
 213                 return(0);
 214                 }
 215
 216         return(1);
 217     }
 218
 219
 220 static int
 221 dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue)
 222     {
 223     pitem *item;
 224
 225     item = pqueue_pop(queue->q);
 226     if (item)
 227         {
 228         dtls1_copy_record(s, item);
 229
 230         OPENSSL_free(item->data);
 231                 pitem_free(item);
 232
 233         return(1);
 234         }
 235
 236     return(0);
 237     }
 238
 239
 240 /* retrieve a buffered record that belongs to the new epoch, i.e., not processed
 241  * yet */
 242 #define dtls1_get_unprocessed_record(s) \
 243                    dtls1_retrieve_buffered_record((s), \
 244                    &((s)->d1->unprocessed_rcds))
 245
 246 /* retrieve a buffered record that belongs to the current epoch, ie, processed */
 247 #define dtls1_get_processed_record(s) \
 248                    dtls1_retrieve_buffered_record((s), \
 249                    &((s)->d1->processed_rcds))
 250
 251 static int
 252 dtls1_process_buffered_records(SSL *s)
 253     {
 254     pitem *item;
 255
 256     item = pqueue_peek(s->d1->unprocessed_rcds.q);
 257     if (item)
 258         {
 259         /* Check if epoch is current. */
 260         if (s->d1->unprocessed_rcds.epoch != s->d1->r_epoch)
 261             return(1);  /* Nothing to do. */
 262
 263         /* Process all the records. */
 264         while (pqueue_peek(s->d1->unprocessed_rcds.q))
 265             {
 266             dtls1_get_unprocessed_record(s);
 267             if ( ! dtls1_process_record(s))
 268                 return(0);
 269             dtls1_buffer_record(s, &(s->d1->processed_rcds),
 270                 &s->s3->rrec.seq_num);
 271             }
 272         }
 273
 274     /* sync epoch numbers once all the unprocessed records
 275      * have been processed */
 276     s->d1->processed_rcds.epoch = s->d1->r_epoch;
 277     s->d1->unprocessed_rcds.epoch = s->d1->r_epoch + 1;
 278
 279     return(1);
 280     }
 281
 282
 283 #if 0
 284
 285 static int
 286 dtls1_get_buffered_record(SSL *s)
 287         {
 288         pitem *item;
 289         PQ_64BIT priority =
 290                 (((PQ_64BIT)s->d1->handshake_read_seq) << 32) |
 291                 ((PQ_64BIT)s->d1->r_msg_hdr.frag_off);
 292
 293         if ( ! SSL_in_init(s))  /* if we're not (re)negotiating,
 294                                                            nothing buffered */
 295                 return 0;
 296
 297
 298         item = pqueue_peek(s->d1->rcvd_records);
 299         if (item && item->priority == priority)
 300                 {
 301                 /* Check if we've received the record of interest.  It must be
 302                  * a handshake record, since data records as passed up without
 303                  * buffering */
 304                 DTLS1_RECORD_DATA *rdata;
 305                 item = pqueue_pop(s->d1->rcvd_records);
 306                 rdata = (DTLS1_RECORD_DATA *)item->data;
 307
 308                 if (s->s3->rbuf.buf != NULL)
 309                         OPENSSL_free(s->s3->rbuf.buf);
 310
 311                 s->packet = rdata->packet;
 312                 s->packet_length = rdata->packet_length;
 313                 memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
 314                 memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
 315
 316                 OPENSSL_free(item->data);
 317                 pitem_free(item);
 318
 319                 /* s->d1->next_expected_seq_num++; */
 320                 return(1);
 321                 }
 322
 323         return 0;
 324         }
 325
 326 #endif
 327
 328 static int
 329 dtls1_process_record(SSL *s)
 330 {
 331     int al;
 332         int clear=0;
 333     int enc_err;
 334         SSL_SESSION *sess;
 335     SSL3_RECORD *rr;
 336         unsigned int mac_size;
 337         unsigned char md[EVP_MAX_MD_SIZE];
 338         int decryption_failed_or_bad_record_mac = 0;
 339
 340
 341         rr= &(s->s3->rrec);
 342     sess = s->session;
 343
 344         /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
 345          * and we have that many bytes in s->packet
 346          */
 347         rr->input= &(s->packet[DTLS1_RT_HEADER_LENGTH]);
 348
 349         /* ok, we can now read from 's->packet' data into 'rr'
 350          * rr->input points at rr->length bytes, which
 351          * need to be copied into rr->data by either
 352          * the decryption or by the decompression
 353          * When the data is 'copied' into the rr->data buffer,
 354          * rr->input will be pointed at the new buffer */
 355
 356         /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
 357          * rr->length bytes of encrypted compressed stuff. */
 358
 359         /* check is not needed I believe */
 360         if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
 361                 {
 362                 al=SSL_AD_RECORD_OVERFLOW;
 363                 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
 364                 goto f_err;
 365                 }
 366
 367         /* decrypt in place in 'rr->input' */
 368         rr->data=rr->input;
 369
 370         enc_err = s->method->ssl3_enc->enc(s,0);
 371         if (enc_err <= 0)
 372                 {
 373                 /* To minimize information leaked via timing, we will always
 374                  * perform all computations before discarding the message.
 375                  */
 376                 decryption_failed_or_bad_record_mac = 1;
 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     clear=1;
 390
 391         if (!clear)
 392                 {
 393                 mac_size=EVP_MD_size(s->read_hash);
 394
 395                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+mac_size)
 396                         {
 397 #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
 398                         al=SSL_AD_RECORD_OVERFLOW;
 399                         SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
 400                         goto f_err;
 401 #else
 402                         decryption_failed_or_bad_record_mac = 1;
 403 #endif
 404                         }
 405                 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
 406                 if (rr->length < mac_size)
 407                         {
 408 #if 0 /* OK only for stream ciphers */
 409                         al=SSL_AD_DECODE_ERROR;
 410                         SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_LENGTH_TOO_SHORT);
 411                         goto f_err;
 412 #else
 413                         decryption_failed_or_bad_record_mac = 1;
 414 #endif
 415                         }
 416                 rr->length-=mac_size;
 417                 s->method->ssl3_enc->mac(s,md,0);
 418                 if (memcmp(md,&(rr->data[rr->length]),mac_size) != 0)
 419                         {
 420                         decryption_failed_or_bad_record_mac = 1;
 421                         }
 422                 }
 423
 424         if (decryption_failed_or_bad_record_mac)
 425                 {
 426                 /* decryption failed, silently discard message */
 427                 rr->length = 0;
 428                 s->packet_length = 0;
 429                 goto err;
 430                 }
 431
 432         /* r->length is now just compressed */
 433         if (s->expand != NULL)
 434                 {
 435                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH)
 436                         {
 437                         al=SSL_AD_RECORD_OVERFLOW;
 438                         SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
 439                         goto f_err;
 440                         }
 441                 if (!ssl3_do_uncompress(s))
 442                         {
 443                         al=SSL_AD_DECOMPRESSION_FAILURE;
 444                         SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_BAD_DECOMPRESSION);
 445                         goto f_err;
 446                         }
 447                 }
 448
 449         if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH)
 450                 {
 451                 al=SSL_AD_RECORD_OVERFLOW;
 452                 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
 453                 goto f_err;
 454                 }
 455
 456         rr->off=0;
 457         /* So at this point the following is true
 458          * ssl->s3->rrec.type   is the type of record
 459          * ssl->s3->rrec.length == number of bytes in record
 460          * ssl->s3->rrec.off    == offset to first valid byte
 461          * ssl->s3->rrec.data   == where to take bytes from, increment
 462          *                         after use :-).
 463          */
 464
 465         /* we have pulled in a full packet so zero things */
 466         s->packet_length=0;
 467     dtls1_record_bitmap_update(s, &(s->d1->bitmap));/* Mark receipt of record. */
 468     return(1);
 469
 470 f_err:
 471         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 472 err:
 473         return(0);
 474 }
 475
 476
 477 /* Call this to get a new input record.
 478  * It will return <= 0 if more data is needed, normally due to an error
 479  * or non-blocking IO.
 480  * When it finishes, one packet has been decoded and can be found in
 481  * ssl->s3->rrec.type    - is the type of record
 482  * ssl->s3->rrec.data,   - data
 483  * ssl->s3->rrec.length, - number of bytes
 484  */
 485 /* used only by dtls1_read_bytes */
 486 int dtls1_get_record(SSL *s)
 487         {
 488         int ssl_major,ssl_minor;
 489         int i,n;
 490         SSL3_RECORD *rr;
 491         unsigned char *p = NULL;
 492         unsigned short version;
 493         DTLS1_BITMAP *bitmap;
 494         unsigned int is_next_epoch;
 495
 496         rr= &(s->s3->rrec);
 497
 498     /* The epoch may have changed.  If so, process all the
 499      * pending records.  This is a non-blocking operation. */
 500     dtls1_process_buffered_records(s);
 501
 502         /* if we're renegotiating, then there may be buffered records */
 503         if (dtls1_get_processed_record(s))
 504                 return 1;
 505
 506         /* get something from the wire */
 507 again:
 508         /* check if we have the header */
 509         if (    (s->rstate != SSL_ST_READ_BODY) ||
 510                 (s->packet_length < DTLS1_RT_HEADER_LENGTH))
 511                 {
 512                 n=ssl3_read_n(s, DTLS1_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
 513                 /* read timeout is handled by dtls1_read_bytes */
 514                 if (n <= 0) return(n); /* error or non-blocking */
 515
 516                 /* this packet contained a partial record, dump it */
 517                 if (s->packet_length != DTLS1_RT_HEADER_LENGTH)
 518                         {
 519                         s->packet_length = 0;
 520                         goto again;
 521                         }
 522
 523                 s->rstate=SSL_ST_READ_BODY;
 524
 525                 p=s->packet;
 526
 527                 /* Pull apart the header into the DTLS1_RECORD */
 528                 rr->type= *(p++);
 529                 ssl_major= *(p++);
 530                 ssl_minor= *(p++);
 531                 version=(ssl_major<<8)|ssl_minor;
 532
 533                 /* sequence number is 64 bits, with top 2 bytes = epoch */
 534                 n2s(p,rr->epoch);
 535
 536                 memcpy(&(s->s3->read_sequence[2]), p, 6);
 537                 p+=6;
 538
 539                 n2s(p,rr->length);
 540
 541                 /* Lets check version */
 542                 if (!s->first_packet)
 543                         {
 544                         if (version != s->version && version != DTLS1_BAD_VER)
 545                                 {
 546                                 /* unexpected version, silently discard */
 547                                 rr->length = 0;
 548                                 s->packet_length = 0;
 549                                 goto again;
 550                                 }
 551                         }
 552
 553                 if ((version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
 554                     (version & 0xff00) != (DTLS1_BAD_VER & 0xff00))
 555                         {
 556                         /* wrong version, silently discard record */
 557                         rr->length = 0;
 558                         s->packet_length = 0;
 559                         goto again;
 560                         }
 561
 562                 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
 563                         {
 564                         /* record too long, silently discard it */
 565                         rr->length = 0;
 566                         s->packet_length = 0;
 567                         goto again;
 568                         }
 569
 570                 s->client_version = version;
 571                 /* now s->rstate == SSL_ST_READ_BODY */
 572                 }
 573
 574         /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
 575
 576         if (rr->length > s->packet_length-DTLS1_RT_HEADER_LENGTH)
 577                 {
 578                 /* now s->packet_length == DTLS1_RT_HEADER_LENGTH */
 579                 i=rr->length;
 580                 n=ssl3_read_n(s,i,i,1);
 581                 if (n <= 0) return(n); /* error or non-blocking io */
 582
 583                 /* this packet contained a partial record, dump it */
 584                 if ( n != i)
 585                         {
 586                         rr->length = 0;
 587                         s->packet_length = 0;
 588                         goto again;
 589                         }
 590
 591                 /* now n == rr->length,
 592                  * and s->packet_length == DTLS1_RT_HEADER_LENGTH + rr->length */
 593                 }
 594         s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
 595
 596         /* match epochs.  NULL means the packet is dropped on the floor */
 597         bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch);
 598         if ( bitmap == NULL)
 599         {
 600         rr->length = 0;
 601         s->packet_length = 0;  /* dump this record */
 602         goto again;   /* get another record */
 603                 }
 604
 605         /* Check whether this is a repeat, or aged record.
 606          * Don't check if we're listening and this message is
 607          * a ClientHello. They can look as if they're replayed,
 608          * since they arrive from different connections and
 609          * would be dropped unnecessarily.
 610          */
 611         if (!(s->d1->listen && rr->type == SSL3_RT_HANDSHAKE &&
 612                 *p == SSL3_MT_CLIENT_HELLO) &&
 613                 ! dtls1_record_replay_check(s, bitmap, &(rr->seq_num)))
 614                 {
 615                 rr->length = 0;
 616                 s->packet_length=0; /* dump this record */
 617                 goto again;     /* get another record */
 618                 }
 619
 620         /* just read a 0 length packet */
 621         if (rr->length == 0) goto again;
 622
 623         /* If this record is from the next epoch (either HM or ALERT),
 624          * and a handshake is currently in progress, buffer it since it
 625          * cannot be processed at this time. However, do not buffer
 626          * anything while listening.
 627          */
 628         if (is_next_epoch)
 629                 {
 630                 if ((SSL_in_init(s) || s->in_handshake) && !s->d1->listen)
 631                         {
 632                         dtls1_buffer_record(s, &(s->d1->unprocessed_rcds), &rr->seq_num);
 633                         }
 634                 rr->length = 0;
 635         s->packet_length = 0;
 636         goto again;
 637         }
 638
 639     if (!dtls1_process_record(s))
 640                 {
 641                 rr->length = 0;
 642                 s->packet_length=0; /* dump this record */
 643                 goto again;     /* get another record */
 644                 }
 645
 646         dtls1_clear_timeouts(s);  /* done waiting */
 647         return(1);
 648
 649         }
 650
 651 /* Return up to 'len' payload bytes received in 'type' records.
 652  * 'type' is one of the following:
 653  *
 654  *   -  SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
 655  *   -  SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
 656  *   -  0 (during a shutdown, no data has to be returned)
 657  *
 658  * If we don't have stored data to work from, read a SSL/TLS record first
 659  * (possibly multiple records if we still don't have anything to return).
 660  *
 661  * This function must handle any surprises the peer may have for us, such as
 662  * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
 663  * a surprise, but handled as if it were), or renegotiation requests.
 664  * Also if record payloads contain fragments too small to process, we store
 665  * them until there is enough for the respective protocol (the record protocol
 666  * may use arbitrary fragmentation and even interleaving):
 667  *     Change cipher spec protocol
 668  *             just 1 byte needed, no need for keeping anything stored
 669  *     Alert protocol
 670  *             2 bytes needed (AlertLevel, AlertDescription)
 671  *     Handshake protocol
 672  *             4 bytes needed (HandshakeType, uint24 length) -- we just have
 673  *             to detect unexpected Client Hello and Hello Request messages
 674  *             here, anything else is handled by higher layers
 675  *     Application data protocol
 676  *             none of our business
 677  */
 678 int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
 679         {
 680         int al,i,j,ret;
 681         unsigned int n;
 682         SSL3_RECORD *rr;
 683         void (*cb)(const SSL *ssl,int type2,int val)=NULL;
 684
 685         if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
 686                 if (!ssl3_setup_buffers(s))
 687                         return(-1);
 688
 689     /* XXX: check what the second '&& type' is about */
 690         if ((type && (type != SSL3_RT_APPLICATION_DATA) &&
 691                 (type != SSL3_RT_HANDSHAKE) && type) ||
 692             (peek && (type != SSL3_RT_APPLICATION_DATA)))
 693                 {
 694                 SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
 695                 return -1;
 696                 }
 697
 698         /* check whether there's a handshake message (client hello?) waiting */
 699         if ( (ret = have_handshake_fragment(s, type, buf, len, peek)))
 700                 return ret;
 701
 702         /* Now s->d1->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
 703
 704         if (!s->in_handshake && SSL_in_init(s))
 705                 {
 706                 /* type == SSL3_RT_APPLICATION_DATA */
 707                 i=s->handshake_func(s);
 708                 if (i < 0) return(i);
 709                 if (i == 0)
 710                         {
 711                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 712                         return(-1);
 713                         }
 714                 }
 715
 716 start:
 717         s->rwstate=SSL_NOTHING;
 718
 719         /* s->s3->rrec.type         - is the type of record
 720          * s->s3->rrec.data,    - data
 721          * s->s3->rrec.off,     - offset into 'data' for next read
 722          * s->s3->rrec.length,  - number of bytes. */
 723         rr = &(s->s3->rrec);
 724
 725         /* We are not handshaking and have no data yet,
 726          * so process data buffered during the last handshake
 727          * in advance, if any.
 728          */
 729         if (s->state == SSL_ST_OK && rr->length == 0)
 730                 {
 731                 pitem *item;
 732                 item = pqueue_pop(s->d1->buffered_app_data.q);
 733                 if (item)
 734                         {
 735                         dtls1_copy_record(s, item);
 736
 737                         OPENSSL_free(item->data);
 738                         pitem_free(item);
 739                         }
 740                 }
 741
 742         /* Check for timeout */
 743         if (dtls1_handle_timeout(s) > 0)
 744                 goto start;
 745
 746         /* get new packet if necessary */
 747         if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
 748                 {
 749                 ret=dtls1_get_record(s);
 750                 if (ret <= 0)
 751                         {
 752                         ret = dtls1_read_failed(s, ret);
 753                         /* anything other than a timeout is an error */
 754                         if (ret <= 0)
 755                                 return(ret);
 756                         else
 757                                 goto start;
 758                         }
 759                 }
 760
 761         /* we now have a packet which can be read and processed */
 762
 763         if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
 764                                        * reset by ssl3_get_finished */
 765                 && (rr->type != SSL3_RT_HANDSHAKE))
 766                 {
 767                 /* We now have application data between CCS and Finished.
 768                  * Most likely the packets were reordered on their way, so
 769                  * buffer the application data for later processing rather
 770                  * than dropping the connection.
 771                  */
 772                 dtls1_buffer_record(s, &(s->d1->buffered_app_data), &rr->seq_num);
 773                 rr->length = 0;
 774                 goto start;
 775                 }
 776
 777         /* If the other end has shut down, throw anything we read away
 778          * (even in 'peek' mode) */
 779         if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
 780                 {
 781                 rr->length=0;
 782                 s->rwstate=SSL_NOTHING;
 783                 return(0);
 784                 }
 785
 786
 787         if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
 788                 {
 789                 /* make sure that we are not getting application data when we
 790                  * are doing a handshake for the first time */
 791                 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
 792                         (s->enc_read_ctx == NULL))
 793                         {
 794                         al=SSL_AD_UNEXPECTED_MESSAGE;
 795                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
 796                         goto f_err;
 797                         }
 798
 799                 if (len <= 0) return(len);
 800
 801                 if ((unsigned int)len > rr->length)
 802                         n = rr->length;
 803                 else
 804                         n = (unsigned int)len;
 805
 806                 memcpy(buf,&(rr->data[rr->off]),n);
 807                 if (!peek)
 808                         {
 809                         rr->length-=n;
 810                         rr->off+=n;
 811                         if (rr->length == 0)
 812                                 {
 813                                 s->rstate=SSL_ST_READ_HEADER;
 814                                 rr->off=0;
 815                                 }
 816                         }
 817                 return(n);
 818                 }
 819
 820
 821         /* If we get here, then type != rr->type; if we have a handshake
 822          * message, then it was unexpected (Hello Request or Client Hello). */
 823
 824         /* In case of record types for which we have 'fragment' storage,
 825          * fill that so that we can process the data at a fixed place.
 826          */
 827                 {
 828                 unsigned int k, dest_maxlen = 0;
 829                 unsigned char *dest = NULL;
 830                 unsigned int *dest_len = NULL;
 831
 832                 if (rr->type == SSL3_RT_HANDSHAKE)
 833                         {
 834                         dest_maxlen = sizeof s->d1->handshake_fragment;
 835                         dest = s->d1->handshake_fragment;
 836                         dest_len = &s->d1->handshake_fragment_len;
 837                         }
 838                 else if (rr->type == SSL3_RT_ALERT)
 839                         {
 840                         dest_maxlen = sizeof(s->d1->alert_fragment);
 841                         dest = s->d1->alert_fragment;
 842                         dest_len = &s->d1->alert_fragment_len;
 843                         }
 844                 /* else it's a CCS message, or application data or wrong */
 845                 else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC)
 846                         {
 847                         /* Application data while renegotiating
 848                          * is allowed. Try again reading.
 849                          */
 850                         if (rr->type == SSL3_RT_APPLICATION_DATA)
 851                                 {
 852                                 BIO *bio;
 853                                 s->s3->in_read_app_data=2;
 854                                 bio=SSL_get_rbio(s);
 855                                 s->rwstate=SSL_READING;
 856                                 BIO_clear_retry_flags(bio);
 857                                 BIO_set_retry_read(bio);
 858                                 return(-1);
 859                                 }
 860
 861                         /* Not certain if this is the right error handling */
 862                         al=SSL_AD_UNEXPECTED_MESSAGE;
 863                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
 864                         goto f_err;
 865                         }
 866
 867                 if (dest_maxlen > 0)
 868                         {
 869             /* XDTLS:  In a pathalogical case, the Client Hello
 870              *  may be fragmented--don't always expect dest_maxlen bytes */
 871                         if ( rr->length < dest_maxlen)
 872                                 {
 873 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
 874                                 /*
 875                                  * for normal alerts rr->length is 2, while
 876                                  * dest_maxlen is 7 if we were to handle this
 877                                  * non-existing alert...
 878                                  */
 879                                 FIX ME
 880 #endif
 881                                 s->rstate=SSL_ST_READ_HEADER;
 882                                 rr->length = 0;
 883                                 goto start;
 884                                 }
 885
 886                         /* now move 'n' bytes: */
 887                         for ( k = 0; k < dest_maxlen; k++)
 888                                 {
 889                                 dest[k] = rr->data[rr->off++];
 890                                 rr->length--;
 891                                 }
 892                         *dest_len = dest_maxlen;
 893                         }
 894                 }
 895
 896         /* s->d1->handshake_fragment_len == 12  iff  rr->type == SSL3_RT_HANDSHAKE;
 897          * s->d1->alert_fragment_len == 7      iff  rr->type == SSL3_RT_ALERT.
 898          * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
 899
 900         /* If we are a client, check for an incoming 'Hello Request': */
 901         if ((!s->server) &&
 902                 (s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
 903                 (s->d1->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
 904                 (s->session != NULL) && (s->session->cipher != NULL))
 905                 {
 906                 s->d1->handshake_fragment_len = 0;
 907
 908                 if ((s->d1->handshake_fragment[1] != 0) ||
 909                         (s->d1->handshake_fragment[2] != 0) ||
 910                         (s->d1->handshake_fragment[3] != 0))
 911                         {
 912                         al=SSL_AD_DECODE_ERROR;
 913                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
 914                         goto err;
 915                         }
 916
 917                 /* no need to check sequence number on HELLO REQUEST messages */
 918
 919                 if (s->msg_callback)
 920                         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
 921                                 s->d1->handshake_fragment, 4, s, s->msg_callback_arg);
 922
 923                 if (SSL_is_init_finished(s) &&
 924                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
 925                         !s->s3->renegotiate)
 926                         {
 927                         ssl3_renegotiate(s);
 928                         if (ssl3_renegotiate_check(s))
 929                                 {
 930                                 i=s->handshake_func(s);
 931                                 if (i < 0) return(i);
 932                                 if (i == 0)
 933                                         {
 934                                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 935                                         return(-1);
 936                                         }
 937
 938                                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
 939                                         {
 940                                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
 941                                                 {
 942                                                 BIO *bio;
 943                                                 /* In the case where we try to read application data,
 944                                                  * but we trigger an SSL handshake, we return -1 with
 945                                                  * the retry option set.  Otherwise renegotiation may
 946                                                  * cause nasty problems in the blocking world */
 947                                                 s->rwstate=SSL_READING;
 948                                                 bio=SSL_get_rbio(s);
 949                                                 BIO_clear_retry_flags(bio);
 950                                                 BIO_set_retry_read(bio);
 951                                                 return(-1);
 952                                                 }
 953                                         }
 954                                 }
 955                         }
 956                 /* we either finished a handshake or ignored the request,
 957                  * now try again to obtain the (application) data we were asked for */
 958                 goto start;
 959                 }
 960
 961         if (s->d1->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH)
 962                 {
 963                 int alert_level = s->d1->alert_fragment[0];
 964                 int alert_descr = s->d1->alert_fragment[1];
 965
 966                 s->d1->alert_fragment_len = 0;
 967
 968                 if (s->msg_callback)
 969                         s->msg_callback(0, s->version, SSL3_RT_ALERT,
 970                                 s->d1->alert_fragment, 2, s, s->msg_callback_arg);
 971
 972                 if (s->info_callback != NULL)
 973                         cb=s->info_callback;
 974                 else if (s->ctx->info_callback != NULL)
 975                         cb=s->ctx->info_callback;
 976
 977                 if (cb != NULL)
 978                         {
 979                         j = (alert_level << 8) | alert_descr;
 980                         cb(s, SSL_CB_READ_ALERT, j);
 981                         }
 982
 983                 if (alert_level == 1) /* warning */
 984                         {
 985                         s->s3->warn_alert = alert_descr;
 986                         if (alert_descr == SSL_AD_CLOSE_NOTIFY)
 987                                 {
 988                                 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
 989                                 return(0);
 990                                 }
 991 #if 0
 992             /* XXX: this is a possible improvement in the future */
 993                         /* now check if it's a missing record */
 994                         if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
 995                                 {
 996                                 unsigned short seq;
 997                                 unsigned int frag_off;
 998                                 unsigned char *p = &(s->d1->alert_fragment[2]);
 999
1000                                 n2s(p, seq);
1001                                 n2l3(p, frag_off);
1002
1003                                 dtls1_retransmit_message(s,
1004                                                                                  dtls1_get_queue_priority(frag->msg_header.seq, 0),
1005                                                                                  frag_off, &found);
1006                                 if ( ! found  && SSL_in_init(s))
1007                                         {
1008                                         /* fprintf( stderr,"in init = %d\n", SSL_in_init(s)); */
1009                                         /* requested a message not yet sent,
1010                                            send an alert ourselves */
1011                                         ssl3_send_alert(s,SSL3_AL_WARNING,
1012                                                 DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
1013                                         }
1014                                 }
1015 #endif
1016                         }
1017                 else if (alert_level == 2) /* fatal */
1018                         {
1019                         char tmp[16];
1020
1021                         s->rwstate=SSL_NOTHING;
1022                         s->s3->fatal_alert = alert_descr;
1023                         SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1024                         BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1025                         ERR_add_error_data(2,"SSL alert number ",tmp);
1026                         s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1027                         SSL_CTX_remove_session(s->ctx,s->session);
1028                         return(0);
1029                         }
1030                 else
1031                         {
1032                         al=SSL_AD_ILLEGAL_PARAMETER;
1033                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1034                         goto f_err;
1035                         }
1036
1037                 goto start;
1038                 }
1039
1040         if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1041                 {
1042                 s->rwstate=SSL_NOTHING;
1043                 rr->length=0;
1044                 return(0);
1045                 }
1046
1047         if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1048                 {
1049                 struct ccs_header_st ccs_hdr;
1050                 unsigned int ccs_hdr_len = DTLS1_CCS_HEADER_LENGTH;
1051
1052                 dtls1_get_ccs_header(rr->data, &ccs_hdr);
1053
1054                 /* 'Change Cipher Spec' is just a single byte, so we know
1055                  * exactly what the record payload has to look like */
1056                 /* XDTLS: check that epoch is consistent */
1057                 if (s->client_version == DTLS1_BAD_VER || s->version == DTLS1_BAD_VER)
1058                         ccs_hdr_len = 3;
1059
1060                 if ((rr->length != ccs_hdr_len) || (rr->off != 0) || (rr->data[0] != SSL3_MT_CCS))
1061                         {
1062                         i=SSL_AD_ILLEGAL_PARAMETER;
1063                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1064                         goto err;
1065                         }
1066
1067                 rr->length=0;
1068
1069                 if (s->msg_callback)
1070                         s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,
1071                                 rr->data, 1, s, s->msg_callback_arg);
1072
1073                 /* We can't process a CCS now, because previous handshake
1074                  * messages are still missing, so just drop it.
1075                  */
1076                 if (!s->d1->change_cipher_spec_ok)
1077                         {
1078                         goto start;
1079                         }
1080
1081                 s->d1->change_cipher_spec_ok = 0;
1082
1083                 s->s3->change_cipher_spec=1;
1084                 if (!ssl3_do_change_cipher_spec(s))
1085                         goto err;
1086
1087                 /* do this whenever CCS is processed */
1088                 dtls1_reset_seq_numbers(s, SSL3_CC_READ);
1089
1090                 if (s->client_version == DTLS1_BAD_VER)
1091                         s->d1->handshake_read_seq++;
1092
1093                 goto start;
1094                 }
1095
1096         /* Unexpected handshake message (Client Hello, or protocol violation) */
1097         if ((s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
1098                 !s->in_handshake)
1099                 {
1100                 struct hm_header_st msg_hdr;
1101
1102                 /* this may just be a stale retransmit */
1103                 dtls1_get_message_header(rr->data, &msg_hdr);
1104                 if( rr->epoch != s->d1->r_epoch)
1105                         {
1106                         rr->length = 0;
1107                         goto start;
1108                         }
1109
1110                 /* If we are server, we may have a repeated FINISHED of the
1111                  * client here, then retransmit our CCS and FINISHED.
1112                  */
1113                 if (msg_hdr.type == SSL3_MT_FINISHED)
1114                         {
1115                         dtls1_retransmit_buffered_messages(s);
1116                         rr->length = 0;
1117                         goto start;
1118                         }
1119
1120                 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1121                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1122                         {
1123 #if 0 /* worked only because C operator preferences are not as expected (and
1124        * because this is not really needed for clients except for detecting
1125        * protocol violations): */
1126                         s->state=SSL_ST_BEFORE|(s->server)
1127                                 ?SSL_ST_ACCEPT
1128                                 :SSL_ST_CONNECT;
1129 #else
1130                         s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1131 #endif
1132                         s->new_session=1;
1133                         }
1134                 i=s->handshake_func(s);
1135                 if (i < 0) return(i);
1136                 if (i == 0)
1137                         {
1138                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1139                         return(-1);
1140                         }
1141
1142                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1143                         {
1144                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1145                                 {
1146                                 BIO *bio;
1147                                 /* In the case where we try to read application data,
1148                                  * but we trigger an SSL handshake, we return -1 with
1149                                  * the retry option set.  Otherwise renegotiation may
1150                                  * cause nasty problems in the blocking world */
1151                                 s->rwstate=SSL_READING;
1152                                 bio=SSL_get_rbio(s);
1153                                 BIO_clear_retry_flags(bio);
1154                                 BIO_set_retry_read(bio);
1155                                 return(-1);
1156                                 }
1157                         }
1158                 goto start;
1159                 }
1160
1161         switch (rr->type)
1162                 {
1163         default:
1164 #ifndef OPENSSL_NO_TLS
1165                 /* TLS just ignores unknown message types */
1166                 if (s->version == TLS1_VERSION)
1167                         {
1168                         rr->length = 0;
1169                         goto start;
1170                         }
1171 #endif
1172                 al=SSL_AD_UNEXPECTED_MESSAGE;
1173                 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1174                 goto f_err;
1175         case SSL3_RT_CHANGE_CIPHER_SPEC:
1176         case SSL3_RT_ALERT:
1177         case SSL3_RT_HANDSHAKE:
1178                 /* we already handled all of these, with the possible exception
1179                  * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1180                  * should not happen when type != rr->type */
1181                 al=SSL_AD_UNEXPECTED_MESSAGE;
1182                 SSLerr(SSL_F_DTLS1_READ_BYTES,ERR_R_INTERNAL_ERROR);
1183                 goto f_err;
1184         case SSL3_RT_APPLICATION_DATA:
1185                 /* At this point, we were expecting handshake data,
1186                  * but have application data.  If the library was
1187                  * running inside ssl3_read() (i.e. in_read_app_data
1188                  * is set) and it makes sense to read application data
1189                  * at this point (session renegotiation not yet started),
1190                  * we will indulge it.
1191                  */
1192                 if (s->s3->in_read_app_data &&
1193                         (s->s3->total_renegotiations != 0) &&
1194                         ((
1195                                 (s->state & SSL_ST_CONNECT) &&
1196                                 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1197                                 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1198                                 ) || (
1199                                         (s->state & SSL_ST_ACCEPT) &&
1200                                         (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1201                                         (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1202                                         )
1203                                 ))
1204                         {
1205                         s->s3->in_read_app_data=2;
1206                         return(-1);
1207                         }
1208                 else
1209                         {
1210                         al=SSL_AD_UNEXPECTED_MESSAGE;
1211                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1212                         goto f_err;
1213                         }
1214                 }
1215         /* not reached */
1216
1217 f_err:
1218         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1219 err:
1220         return(-1);
1221         }
1222
1223 int
1224 dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len)
1225         {
1226         int i;
1227
1228         if (SSL_in_init(s) && !s->in_handshake)
1229                 {
1230                 i=s->handshake_func(s);
1231                 if (i < 0) return(i);
1232                 if (i == 0)
1233                         {
1234                         SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1235                         return -1;
1236                         }
1237                 }
1238
1239         if (len > SSL3_RT_MAX_PLAIN_LENGTH)
1240                 {
1241                         SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_DTLS_MESSAGE_TOO_BIG);
1242                         return -1;
1243                 }
1244
1245         i = dtls1_write_bytes(s, type, buf_, len);
1246         return i;
1247         }
1248
1249
1250         /* this only happens when a client hello is received and a handshake
1251          * is started. */
1252 static int
1253 have_handshake_fragment(SSL *s, int type, unsigned char *buf,
1254         int len, int peek)
1255         {
1256
1257         if ((type == SSL3_RT_HANDSHAKE) && (s->d1->handshake_fragment_len > 0))
1258                 /* (partially) satisfy request from storage */
1259                 {
1260                 unsigned char *src = s->d1->handshake_fragment;
1261                 unsigned char *dst = buf;
1262                 unsigned int k,n;
1263
1264                 /* peek == 0 */
1265                 n = 0;
1266                 while ((len > 0) && (s->d1->handshake_fragment_len > 0))
1267                         {
1268                         *dst++ = *src++;
1269                         len--; s->d1->handshake_fragment_len--;
1270                         n++;
1271                         }
1272                 /* move any remaining fragment bytes: */
1273                 for (k = 0; k < s->d1->handshake_fragment_len; k++)
1274                         s->d1->handshake_fragment[k] = *src++;
1275                 return n;
1276                 }
1277
1278         return 0;
1279         }
1280
1281
1282
1283
1284 /* Call this to write data in records of type 'type'
1285  * It will return <= 0 if not all data has been sent or non-blocking IO.
1286  */
1287 int dtls1_write_bytes(SSL *s, int type, const void *buf, int len)
1288         {
1289         int i;
1290
1291         OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH);
1292         s->rwstate=SSL_NOTHING;
1293         i=do_dtls1_write(s, type, buf, len, 0);
1294         return i;
1295         }
1296
1297 int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len, int create_empty_fragment)
1298         {
1299         unsigned char *p,*pseq;
1300         int i,mac_size,clear=0;
1301         int prefix_len = 0;
1302         SSL3_RECORD *wr;
1303         SSL3_BUFFER *wb;
1304         SSL_SESSION *sess;
1305         int bs;
1306
1307         /* first check if there is a SSL3_BUFFER still being written
1308          * out.  This will happen with non blocking IO */
1309         if (s->s3->wbuf.left != 0)
1310                 {
1311                 OPENSSL_assert(0); /* XDTLS:  want to see if we ever get here */
1312                 return(ssl3_write_pending(s,type,buf,len));
1313                 }
1314
1315         /* If we have an alert to send, lets send it */
1316         if (s->s3->alert_dispatch)
1317                 {
1318                 i=s->method->ssl_dispatch_alert(s);
1319                 if (i <= 0)
1320                         return(i);
1321                 /* if it went, fall through and send more stuff */
1322                 }
1323
1324         if (len == 0 && !create_empty_fragment)
1325                 return 0;
1326
1327         wr= &(s->s3->wrec);
1328         wb= &(s->s3->wbuf);
1329         sess=s->session;
1330
1331         if (    (sess == NULL) ||
1332                 (s->enc_write_ctx == NULL) ||
1333                 (s->write_hash == NULL))
1334                 clear=1;
1335
1336         if (clear)
1337                 mac_size=0;
1338         else
1339                 mac_size=EVP_MD_size(s->write_hash);
1340
1341         /* DTLS implements explicit IV, so no need for empty fragments */
1342 #if 0
1343         /* 'create_empty_fragment' is true only when this function calls itself */
1344         if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done
1345             && SSL_version(s) != DTLS1_VERSION && SSL_version(s) != DTLS1_BAD_VER)
1346                 {
1347                 /* countermeasure against known-IV weakness in CBC ciphersuites
1348                  * (see http://www.openssl.org/~bodo/tls-cbc.txt)
1349                  */
1350
1351                 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
1352                         {
1353                         /* recursive function call with 'create_empty_fragment' set;
1354                          * this prepares and buffers the data for an empty fragment
1355                          * (these 'prefix_len' bytes are sent out later
1356                          * together with the actual payload) */
1357                         prefix_len = s->method->do_ssl_write(s, type, buf, 0, 1);
1358                         if (prefix_len <= 0)
1359                                 goto err;
1360
1361                         if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE)
1362                                 {
1363                                 /* insufficient space */
1364                                 SSLerr(SSL_F_DO_DTLS1_WRITE, ERR_R_INTERNAL_ERROR);
1365                                 goto err;
1366                                 }
1367                         }
1368
1369                 s->s3->empty_fragment_done = 1;
1370                 }
1371 #endif
1372
1373         p = wb->buf + prefix_len;
1374
1375         /* write the header */
1376
1377         *(p++)=type&0xff;
1378         wr->type=type;
1379
1380         if (s->client_version == DTLS1_BAD_VER)
1381                 *(p++) = DTLS1_BAD_VER>>8,
1382                 *(p++) = DTLS1_BAD_VER&0xff;
1383         else
1384                 *(p++)=(s->version>>8),
1385                 *(p++)=s->version&0xff;
1386
1387         /* field where we are to write out packet epoch, seq num and len */
1388         pseq=p;
1389         p+=10;
1390
1391         /* lets setup the record stuff. */
1392
1393         /* Make space for the explicit IV in case of CBC.
1394          * (this is a bit of a boundary violation, but what the heck).
1395          */
1396         if ( s->enc_write_ctx &&
1397                 (EVP_CIPHER_mode( s->enc_write_ctx->cipher ) & EVP_CIPH_CBC_MODE))
1398                 bs = EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
1399         else
1400                 bs = 0;
1401
1402         wr->data=p + bs;  /* make room for IV in case of CBC */
1403         wr->length=(int)len;
1404         wr->input=(unsigned char *)buf;
1405
1406         /* we now 'read' from wr->input, wr->length bytes into
1407          * wr->data */
1408
1409         /* first we compress */
1410         if (s->compress != NULL)
1411                 {
1412                 if (!ssl3_do_compress(s))
1413                         {
1414                         SSLerr(SSL_F_DO_DTLS1_WRITE,SSL_R_COMPRESSION_FAILURE);
1415                         goto err;
1416                         }
1417                 }
1418         else
1419                 {
1420                 memcpy(wr->data,wr->input,wr->length);
1421                 wr->input=wr->data;
1422                 }
1423
1424         /* we should still have the output to wr->data and the input
1425          * from wr->input.  Length should be wr->length.
1426          * wr->data still points in the wb->buf */
1427
1428         if (mac_size != 0)
1429                 {
1430                 s->method->ssl3_enc->mac(s,&(p[wr->length + bs]),1);
1431                 wr->length+=mac_size;
1432                 }
1433
1434         /* this is true regardless of mac size */
1435         wr->input=p;
1436         wr->data=p;
1437
1438
1439         /* ssl3_enc can only have an error on read */
1440         if (bs) /* bs != 0 in case of CBC */
1441                 {
1442                 RAND_pseudo_bytes(p,bs);
1443                 /* master IV and last CBC residue stand for
1444                  * the rest of randomness */
1445                 wr->length += bs;
1446                 }
1447
1448         s->method->ssl3_enc->enc(s,1);
1449
1450         /* record length after mac and block padding */
1451 /*      if (type == SSL3_RT_APPLICATION_DATA ||
1452         (type == SSL3_RT_ALERT && ! SSL_in_init(s))) */
1453
1454         /* there's only one epoch between handshake and app data */
1455
1456         s2n(s->d1->w_epoch, pseq);
1457
1458         /* XDTLS: ?? */
1459 /*      else
1460         s2n(s->d1->handshake_epoch, pseq); */
1461
1462         memcpy(pseq, &(s->s3->write_sequence[2]), 6);
1463         pseq+=6;
1464         s2n(wr->length,pseq);
1465
1466         /* we should now have
1467          * wr->data pointing to the encrypted data, which is
1468          * wr->length long */
1469         wr->type=type; /* not needed but helps for debugging */
1470         wr->length+=DTLS1_RT_HEADER_LENGTH;
1471
1472 #if 0  /* this is now done at the message layer */
1473         /* buffer the record, making it easy to handle retransmits */
1474         if ( type == SSL3_RT_HANDSHAKE || type == SSL3_RT_CHANGE_CIPHER_SPEC)
1475                 dtls1_buffer_record(s, wr->data, wr->length,
1476                         *((PQ_64BIT *)&(s->s3->write_sequence[0])));
1477 #endif
1478
1479         ssl3_record_sequence_update(&(s->s3->write_sequence[0]));
1480
1481         if (create_empty_fragment)
1482                 {
1483                 /* we are in a recursive call;
1484                  * just return the length, don't write out anything here
1485                  */
1486                 return wr->length;
1487                 }
1488
1489         /* now let's set up wb */
1490         wb->left = prefix_len + wr->length;
1491         wb->offset = 0;
1492
1493         /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
1494         s->s3->wpend_tot=len;
1495         s->s3->wpend_buf=buf;
1496         s->s3->wpend_type=type;
1497         s->s3->wpend_ret=len;
1498
1499         /* we now just need to write the buffer */
1500         return ssl3_write_pending(s,type,buf,len);
1501 err:
1502         return -1;
1503         }
1504
1505
1506
1507 static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap,
1508         PQ_64BIT *seq_num)
1509         {
1510 #if PQ_64BIT_IS_INTEGER
1511         PQ_64BIT mask = 0x0000000000000001L;
1512 #endif
1513         PQ_64BIT rcd_num, tmp;
1514
1515         pq_64bit_init(&rcd_num);
1516         pq_64bit_init(&tmp);
1517
1518         /* this is the sequence number for the record just read */
1519         pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8);
1520
1521
1522         if (pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) ||
1523                 pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num)))
1524                 {
1525                 pq_64bit_assign(seq_num, &rcd_num);
1526                 pq_64bit_free(&rcd_num);
1527                 pq_64bit_free(&tmp);
1528                 return 1;  /* this record is new */
1529                 }
1530
1531         pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
1532
1533         if ( pq_64bit_get_word(&tmp) > bitmap->length)
1534                 {
1535                 pq_64bit_free(&rcd_num);
1536                 pq_64bit_free(&tmp);
1537                 return 0;  /* stale, outside the window */
1538                 }
1539
1540 #if PQ_64BIT_IS_BIGNUM
1541         {
1542         int offset;
1543         pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
1544         pq_64bit_sub_word(&tmp, 1);
1545         offset = pq_64bit_get_word(&tmp);
1546         if ( pq_64bit_is_bit_set(&(bitmap->map), offset))
1547                 {
1548                 pq_64bit_free(&rcd_num);
1549                 pq_64bit_free(&tmp);
1550                 return 0;
1551                 }
1552         }
1553 #else
1554         mask <<= (bitmap->max_seq_num - rcd_num - 1);
1555         if (bitmap->map & mask)
1556                 return 0; /* record previously received */
1557 #endif
1558
1559         pq_64bit_assign(seq_num, &rcd_num);
1560         pq_64bit_free(&rcd_num);
1561         pq_64bit_free(&tmp);
1562         return 1;
1563         }
1564
1565
1566 static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap)
1567         {
1568         unsigned int shift;
1569         PQ_64BIT rcd_num;
1570         PQ_64BIT tmp;
1571         PQ_64BIT_CTX *ctx;
1572
1573         pq_64bit_init(&rcd_num);
1574         pq_64bit_init(&tmp);
1575
1576         pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8);
1577
1578         /* unfortunate code complexity due to 64-bit manipulation support
1579          * on 32-bit machines */
1580         if ( pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) ||
1581                 pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num)))
1582                 {
1583                 pq_64bit_sub(&tmp, &rcd_num, &(bitmap->max_seq_num));
1584                 pq_64bit_add_word(&tmp, 1);
1585
1586                 shift = (unsigned int)pq_64bit_get_word(&tmp);
1587
1588                 pq_64bit_lshift(&(tmp), &(bitmap->map), shift);
1589                 pq_64bit_assign(&(bitmap->map), &tmp);
1590
1591                 pq_64bit_set_bit(&(bitmap->map), 0);
1592                 pq_64bit_add_word(&rcd_num, 1);
1593                 pq_64bit_assign(&(bitmap->max_seq_num), &rcd_num);
1594
1595                 pq_64bit_assign_word(&tmp, 1);
1596                 pq_64bit_lshift(&tmp, &tmp, bitmap->length);
1597                 ctx = pq_64bit_ctx_new(&ctx);
1598                 pq_64bit_mod(&(bitmap->map), &(bitmap->map), &tmp, ctx);
1599                 pq_64bit_ctx_free(ctx);
1600                 }
1601         else
1602                 {
1603                 pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
1604                 pq_64bit_sub_word(&tmp, 1);
1605                 shift = (unsigned int)pq_64bit_get_word(&tmp);
1606
1607                 pq_64bit_set_bit(&(bitmap->map), shift);
1608                 }
1609
1610         pq_64bit_free(&rcd_num);
1611         pq_64bit_free(&tmp);
1612         }
1613
1614
1615 int dtls1_dispatch_alert(SSL *s)
1616         {
1617         int i,j;
1618         void (*cb)(const SSL *ssl,int type,int val)=NULL;
1619         unsigned char buf[DTLS1_AL_HEADER_LENGTH];
1620         unsigned char *ptr = &buf[0];
1621
1622         s->s3->alert_dispatch=0;
1623
1624         memset(buf, 0x00, sizeof(buf));
1625         *ptr++ = s->s3->send_alert[0];
1626         *ptr++ = s->s3->send_alert[1];
1627
1628 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1629         if (s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
1630                 {
1631                 s2n(s->d1->handshake_read_seq, ptr);
1632 #if 0
1633                 if ( s->d1->r_msg_hdr.frag_off == 0)  /* waiting for a new msg */
1634
1635                 else
1636                         s2n(s->d1->r_msg_hdr.seq, ptr); /* partial msg read */
1637 #endif
1638
1639 #if 0
1640                 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);
1641 #endif
1642                 l2n3(s->d1->r_msg_hdr.frag_off, ptr);
1643                 }
1644 #endif
1645
1646         i = do_dtls1_write(s, SSL3_RT_ALERT, &buf[0], sizeof(buf), 0);
1647         if (i <= 0)
1648                 {
1649                 s->s3->alert_dispatch=1;
1650                 /* fprintf( stderr, "not done with alert\n" ); */
1651                 }
1652         else
1653                 {
1654                 if (s->s3->send_alert[0] == SSL3_AL_FATAL
1655 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1656                     || s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1657 #endif
1658                    )
1659                         (void)BIO_flush(s->wbio);
1660
1661                 if (s->msg_callback)
1662                         s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert,
1663                                 2, s, s->msg_callback_arg);
1664
1665                 if (s->info_callback != NULL)
1666                         cb=s->info_callback;
1667                 else if (s->ctx->info_callback != NULL)
1668                         cb=s->ctx->info_callback;
1669
1670                 if (cb != NULL)
1671                         {
1672                         j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1673                         cb(s,SSL_CB_WRITE_ALERT,j);
1674                         }
1675                 }
1676         return(i);
1677         }
1678
1679
1680 static DTLS1_BITMAP *
1681 dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, unsigned int *is_next_epoch)
1682     {
1683
1684     *is_next_epoch = 0;
1685
1686     /* In current epoch, accept HM, CCS, DATA, & ALERT */
1687     if (rr->epoch == s->d1->r_epoch)
1688         return &s->d1->bitmap;
1689
1690     /* Only HM and ALERT messages can be from the next epoch */
1691     else if (rr->epoch == (unsigned long)(s->d1->r_epoch + 1) &&
1692         (rr->type == SSL3_RT_HANDSHAKE ||
1693             rr->type == SSL3_RT_ALERT))
1694         {
1695         *is_next_epoch = 1;
1696         return &s->d1->next_bitmap;
1697         }
1698
1699     return NULL;
1700     }
1701
1702 #if 0
1703 static int
1704 dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, unsigned short *priority,
1705         unsigned long *offset)
1706         {
1707
1708         /* alerts are passed up immediately */
1709         if ( rr->type == SSL3_RT_APPLICATION_DATA ||
1710                 rr->type == SSL3_RT_ALERT)
1711                 return 0;
1712
1713         /* Only need to buffer if a handshake is underway.
1714          * (this implies that Hello Request and Client Hello are passed up
1715          * immediately) */
1716         if ( SSL_in_init(s))
1717                 {
1718                 unsigned char *data = rr->data;
1719                 /* need to extract the HM/CCS sequence number here */
1720                 if ( rr->type == SSL3_RT_HANDSHAKE ||
1721                         rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1722                         {
1723                         unsigned short seq_num;
1724                         struct hm_header_st msg_hdr;
1725                         struct ccs_header_st ccs_hdr;
1726
1727                         if ( rr->type == SSL3_RT_HANDSHAKE)
1728                                 {
1729                                 dtls1_get_message_header(data, &msg_hdr);
1730                                 seq_num = msg_hdr.seq;
1731                                 *offset = msg_hdr.frag_off;
1732                                 }
1733                         else
1734                                 {
1735                                 dtls1_get_ccs_header(data, &ccs_hdr);
1736                                 seq_num = ccs_hdr.seq;
1737                                 *offset = 0;
1738                                 }
1739
1740                         /* this is either a record we're waiting for, or a
1741                          * retransmit of something we happened to previously
1742                          * receive (higher layers will drop the repeat silently */
1743                         if ( seq_num < s->d1->handshake_read_seq)
1744                                 return 0;
1745                         if (rr->type == SSL3_RT_HANDSHAKE &&
1746                                 seq_num == s->d1->handshake_read_seq &&
1747                                 msg_hdr.frag_off < s->d1->r_msg_hdr.frag_off)
1748                                 return 0;
1749                         else if ( seq_num == s->d1->handshake_read_seq &&
1750                                 (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC ||
1751                                         msg_hdr.frag_off == s->d1->r_msg_hdr.frag_off))
1752                                 return 0;
1753                         else
1754                                 {
1755                                 *priority = seq_num;
1756                                 return 1;
1757                                 }
1758                         }
1759                 else /* unknown record type */
1760                         return 0;
1761                 }
1762
1763         return 0;
1764         }
1765 #endif
1766
1767 void
1768 dtls1_reset_seq_numbers(SSL *s, int rw)
1769         {
1770         unsigned char *seq;
1771         unsigned int seq_bytes = sizeof(s->s3->read_sequence);
1772
1773         if ( rw & SSL3_CC_READ)
1774                 {
1775                 seq = s->s3->read_sequence;
1776                 s->d1->r_epoch++;
1777
1778                 pq_64bit_assign(&(s->d1->bitmap.map), &(s->d1->next_bitmap.map));
1779                 s->d1->bitmap.length = s->d1->next_bitmap.length;
1780                 pq_64bit_assign(&(s->d1->bitmap.max_seq_num),
1781                         &(s->d1->next_bitmap.max_seq_num));
1782
1783                 pq_64bit_free(&(s->d1->next_bitmap.map));
1784                 pq_64bit_free(&(s->d1->next_bitmap.max_seq_num));
1785                 memset(&(s->d1->next_bitmap), 0x00, sizeof(DTLS1_BITMAP));
1786                 pq_64bit_init(&(s->d1->next_bitmap.map));
1787                 pq_64bit_init(&(s->d1->next_bitmap.max_seq_num));
1788                 }
1789         else
1790                 {
1791                 seq = s->s3->write_sequence;
1792                 memcpy(s->d1->last_write_sequence, seq, sizeof(s->s3->write_sequence));
1793                 s->d1->w_epoch++;
1794                 }
1795
1796         memset(seq, 0x00, seq_bytes);
1797         }
1798
1799 #if PQ_64BIT_IS_INTEGER
1800 static PQ_64BIT
1801 bytes_to_long_long(unsigned char *bytes, PQ_64BIT *num)
1802        {
1803        PQ_64BIT _num;
1804
1805        _num = (((PQ_64BIT)bytes[0]) << 56) |
1806                (((PQ_64BIT)bytes[1]) << 48) |
1807                (((PQ_64BIT)bytes[2]) << 40) |
1808                (((PQ_64BIT)bytes[3]) << 32) |
1809                (((PQ_64BIT)bytes[4]) << 24) |
1810                (((PQ_64BIT)bytes[5]) << 16) |
1811                (((PQ_64BIT)bytes[6]) <<  8) |
1812                (((PQ_64BIT)bytes[7])      );
1813
1814            *num = _num ;
1815        return _num;
1816        }
1817 #endif
1818
1819
1820 static void
1821 dtls1_clear_timeouts(SSL *s)
1822         {
1823         memset(&(s->d1->timeout), 0x00, sizeof(struct dtls1_timeout_st));
1824         }