3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
6 /* ====================================================================
7 * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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 * ====================================================================
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).
59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60 * All rights reserved.
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.
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).
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.
80 * Redistribution and use in source and binary forms, with or without
81 * modification, are permitted provided that the following conditions
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)"
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
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.]
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>
125 /* mod 128 saturating subtract of two 64-bit values in big-endian order */
126 static int satsub64be(const unsigned char *v1,const unsigned char *v2)
129 if (sizeof(long) == 8) do
130 { const union { long one; char little; } is_endian = {1};
133 if (is_endian.little) break;
134 /* not reached on little-endians */
135 /* following test is redundant, because input is
136 * always aligned, but I take no chances... */
137 if (((size_t)v1|(size_t)v2)&0x7) break;
141 if (l>128) return 128;
142 else if (l<-128) return -128;
146 ret = (int)v1[7]-(int)v2[7];
148 brw = ret>>8; /* brw is either 0 or -1 */
151 { brw += (int)v1[i]-(int)v2[i];
158 { brw += (int)v1[i]-(int)v2[i];
163 brw <<= 8; /* brw is either 0 or -256 */
165 if (sat&0xff) return brw | 0x80;
166 else return brw + (ret&0xFF);
169 static int have_handshake_fragment(SSL *s, int type, unsigned char *buf,
171 static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap);
172 static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap);
173 static DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr,
174 unsigned int *is_next_epoch);
176 static int dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr,
177 unsigned short *priority, unsigned long *offset);
179 static int dtls1_buffer_record(SSL *s, record_pqueue *q,
180 unsigned char *priority);
181 static int dtls1_process_record(SSL *s);
182 static void dtls1_clear_timeouts(SSL *s);
184 /* copy buffered record into SSL structure */
186 dtls1_copy_record(SSL *s, pitem *item)
188 DTLS1_RECORD_DATA *rdata;
190 rdata = (DTLS1_RECORD_DATA *)item->data;
192 if (s->s3->rbuf.buf != NULL)
193 OPENSSL_free(s->s3->rbuf.buf);
195 s->packet = rdata->packet;
196 s->packet_length = rdata->packet_length;
197 memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
198 memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
200 /* Set proper sequence number for mac calculation */
201 memcpy(&(s->s3->read_sequence[2]), &(rdata->packet[5]), 6);
208 dtls1_buffer_record(SSL *s, record_pqueue *queue, unsigned char *priority)
210 DTLS1_RECORD_DATA *rdata;
213 /* Limit the size of the queue to prevent DOS attacks */
214 if (pqueue_size(queue->q) >= 100)
217 rdata = OPENSSL_malloc(sizeof(DTLS1_RECORD_DATA));
218 item = pitem_new(priority, rdata);
219 if (rdata == NULL || item == NULL)
221 if (rdata != NULL) OPENSSL_free(rdata);
222 if (item != NULL) pitem_free(item);
224 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
228 rdata->packet = s->packet;
229 rdata->packet_length = s->packet_length;
230 memcpy(&(rdata->rbuf), &(s->s3->rbuf), sizeof(SSL3_BUFFER));
231 memcpy(&(rdata->rrec), &(s->s3->rrec), sizeof(SSL3_RECORD));
235 /* insert should not fail, since duplicates are dropped */
236 if (pqueue_insert(queue->q, item) == NULL)
244 s->packet_length = 0;
245 memset(&(s->s3->rbuf), 0, sizeof(SSL3_BUFFER));
246 memset(&(s->s3->rrec), 0, sizeof(SSL3_RECORD));
248 if (!ssl3_setup_buffers(s))
250 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
261 dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue)
265 item = pqueue_pop(queue->q);
268 dtls1_copy_record(s, item);
270 OPENSSL_free(item->data);
280 /* retrieve a buffered record that belongs to the new epoch, i.e., not processed
282 #define dtls1_get_unprocessed_record(s) \
283 dtls1_retrieve_buffered_record((s), \
284 &((s)->d1->unprocessed_rcds))
286 /* retrieve a buffered record that belongs to the current epoch, ie, processed */
287 #define dtls1_get_processed_record(s) \
288 dtls1_retrieve_buffered_record((s), \
289 &((s)->d1->processed_rcds))
292 dtls1_process_buffered_records(SSL *s)
296 item = pqueue_peek(s->d1->unprocessed_rcds.q);
299 DTLS1_RECORD_DATA *rdata;
300 rdata = (DTLS1_RECORD_DATA *)item->data;
302 /* Check if epoch is current. */
303 if (s->d1->unprocessed_rcds.epoch != s->d1->r_epoch)
304 return(1); /* Nothing to do. */
306 /* Process all the records. */
307 while (pqueue_peek(s->d1->unprocessed_rcds.q))
309 dtls1_get_unprocessed_record(s);
310 if ( ! dtls1_process_record(s))
312 dtls1_buffer_record(s, &(s->d1->processed_rcds),
313 s->s3->rrec.seq_num);
317 /* sync epoch numbers once all the unprocessed records
318 * have been processed */
319 s->d1->processed_rcds.epoch = s->d1->r_epoch;
320 s->d1->unprocessed_rcds.epoch = s->d1->r_epoch + 1;
329 dtls1_get_buffered_record(SSL *s)
333 (((PQ_64BIT)s->d1->handshake_read_seq) << 32) |
334 ((PQ_64BIT)s->d1->r_msg_hdr.frag_off);
336 if ( ! SSL_in_init(s)) /* if we're not (re)negotiating,
341 item = pqueue_peek(s->d1->rcvd_records);
342 if (item && item->priority == priority)
344 /* Check if we've received the record of interest. It must be
345 * a handshake record, since data records as passed up without
347 DTLS1_RECORD_DATA *rdata;
348 item = pqueue_pop(s->d1->rcvd_records);
349 rdata = (DTLS1_RECORD_DATA *)item->data;
351 if (s->s3->rbuf.buf != NULL)
352 OPENSSL_free(s->s3->rbuf.buf);
354 s->packet = rdata->packet;
355 s->packet_length = rdata->packet_length;
356 memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
357 memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
359 OPENSSL_free(item->data);
362 /* s->d1->next_expected_seq_num++; */
372 dtls1_process_record(SSL *s)
379 unsigned int mac_size;
380 unsigned char md[EVP_MAX_MD_SIZE];
386 /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
387 * and we have that many bytes in s->packet
389 rr->input= &(s->packet[DTLS1_RT_HEADER_LENGTH]);
391 /* ok, we can now read from 's->packet' data into 'rr'
392 * rr->input points at rr->length bytes, which
393 * need to be copied into rr->data by either
394 * the decryption or by the decompression
395 * When the data is 'copied' into the rr->data buffer,
396 * rr->input will be pointed at the new buffer */
398 /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
399 * rr->length bytes of encrypted compressed stuff. */
401 /* check is not needed I believe */
402 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
404 al=SSL_AD_RECORD_OVERFLOW;
405 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
409 /* decrypt in place in 'rr->input' */
412 enc_err = s->method->ssl3_enc->enc(s,0);
416 /* SSLerr() and ssl3_send_alert() have been called */
419 /* otherwise enc_err == -1 */
420 goto decryption_failed_or_bad_record_mac;
424 printf("dec %d\n",rr->length);
425 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
429 /* r->length is now the compressed data plus mac */
430 if ( (sess == NULL) ||
431 (s->enc_read_ctx == NULL) ||
432 (s->read_hash == NULL))
437 /* !clear => s->read_hash != NULL => mac_size != -1 */
439 t=EVP_MD_CTX_size(s->read_hash);
440 OPENSSL_assert(t >= 0);
443 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+mac_size)
445 #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
446 al=SSL_AD_RECORD_OVERFLOW;
447 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
450 goto decryption_failed_or_bad_record_mac;
453 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
454 if (rr->length < mac_size)
456 #if 0 /* OK only for stream ciphers */
457 al=SSL_AD_DECODE_ERROR;
458 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_LENGTH_TOO_SHORT);
461 goto decryption_failed_or_bad_record_mac;
464 rr->length-=mac_size;
465 i=s->method->ssl3_enc->mac(s,md,0);
466 if (i < 0 || memcmp(md,&(rr->data[rr->length]),mac_size) != 0)
468 goto decryption_failed_or_bad_record_mac;
472 /* r->length is now just compressed */
473 if (s->expand != NULL)
475 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH)
477 al=SSL_AD_RECORD_OVERFLOW;
478 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
481 if (!ssl3_do_uncompress(s))
483 al=SSL_AD_DECOMPRESSION_FAILURE;
484 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_BAD_DECOMPRESSION);
489 if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH)
491 al=SSL_AD_RECORD_OVERFLOW;
492 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
497 /* So at this point the following is true
498 * ssl->s3->rrec.type is the type of record
499 * ssl->s3->rrec.length == number of bytes in record
500 * ssl->s3->rrec.off == offset to first valid byte
501 * ssl->s3->rrec.data == where to take bytes from, increment
505 /* we have pulled in a full packet so zero things */
507 dtls1_record_bitmap_update(s, &(s->d1->bitmap));/* Mark receipt of record. */
510 decryption_failed_or_bad_record_mac:
511 /* Separate 'decryption_failed' alert was introduced with TLS 1.0,
512 * SSL 3.0 only has 'bad_record_mac'. But unless a decryption
513 * failure is directly visible from the ciphertext anyway,
514 * we should not reveal which kind of error occured -- this
515 * might become visible to an attacker (e.g. via logfile) */
516 al=SSL_AD_BAD_RECORD_MAC;
517 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
519 ssl3_send_alert(s,SSL3_AL_FATAL,al);
525 /* Call this to get a new input record.
526 * It will return <= 0 if more data is needed, normally due to an error
527 * or non-blocking IO.
528 * When it finishes, one packet has been decoded and can be found in
529 * ssl->s3->rrec.type - is the type of record
530 * ssl->s3->rrec.data, - data
531 * ssl->s3->rrec.length, - number of bytes
533 /* used only by dtls1_read_bytes */
534 int dtls1_get_record(SSL *s)
536 int ssl_major,ssl_minor;
540 unsigned char *p = NULL;
541 unsigned short version;
542 DTLS1_BITMAP *bitmap;
543 unsigned int is_next_epoch;
548 /* The epoch may have changed. If so, process all the
549 * pending records. This is a non-blocking operation. */
550 if ( ! dtls1_process_buffered_records(s))
553 /* if we're renegotiating, then there may be buffered records */
554 if (dtls1_get_processed_record(s))
557 /* get something from the wire */
559 /* check if we have the header */
560 if ( (s->rstate != SSL_ST_READ_BODY) ||
561 (s->packet_length < DTLS1_RT_HEADER_LENGTH))
563 n=ssl3_read_n(s, DTLS1_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
564 /* read timeout is handled by dtls1_read_bytes */
565 if (n <= 0) return(n); /* error or non-blocking */
567 /* this packet contained a partial record, dump it */
568 if (s->packet_length != DTLS1_RT_HEADER_LENGTH)
570 s->packet_length = 0;
574 s->rstate=SSL_ST_READ_BODY;
578 /* Pull apart the header into the DTLS1_RECORD */
582 version=(ssl_major<<8)|ssl_minor;
584 /* sequence number is 64 bits, with top 2 bytes = epoch */
587 memcpy(&(s->s3->read_sequence[2]), p, 6);
592 /* Lets check version */
593 if (!s->first_packet)
595 if (version != s->version)
597 /* unexpected version, silently discard */
599 s->packet_length = 0;
604 if ((version & 0xff00) != (s->version & 0xff00))
606 /* wrong version, silently discard record */
608 s->packet_length = 0;
612 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
614 /* record too long, silently discard it */
616 s->packet_length = 0;
620 /* now s->rstate == SSL_ST_READ_BODY */
623 /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
625 if (rr->length > s->packet_length-DTLS1_RT_HEADER_LENGTH)
627 /* now s->packet_length == DTLS1_RT_HEADER_LENGTH */
629 n=ssl3_read_n(s,i,i,1);
630 if (n <= 0) return(n); /* error or non-blocking io */
632 /* this packet contained a partial record, dump it */
636 s->packet_length = 0;
640 /* now n == rr->length,
641 * and s->packet_length == DTLS1_RT_HEADER_LENGTH + rr->length */
643 s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
645 /* match epochs. NULL means the packet is dropped on the floor */
646 bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch);
650 s->packet_length = 0; /* dump this record */
651 goto again; /* get another record */
654 /* Check whether this is a repeat, or aged record.
655 * Don't check if we're listening and this message is
656 * a ClientHello. They can look as if they're replayed,
657 * since they arrive from different connections and
658 * would be dropped unnecessarily.
660 if (!(s->d1->listen && rr->type == SSL3_RT_HANDSHAKE &&
661 *p == SSL3_MT_CLIENT_HELLO) &&
662 !dtls1_record_replay_check(s, bitmap))
665 s->packet_length=0; /* dump this record */
666 goto again; /* get another record */
669 /* just read a 0 length packet */
670 if (rr->length == 0) goto again;
672 /* If this record is from the next epoch (either HM or ALERT),
673 * and a handshake is currently in progress, buffer it since it
674 * cannot be processed at this time. */
677 if (SSL_in_init(s) || s->in_handshake)
679 dtls1_buffer_record(s, &(s->d1->unprocessed_rcds), rr->seq_num);
682 s->packet_length = 0;
686 if ( ! dtls1_process_record(s))
689 dtls1_clear_timeouts(s); /* done waiting */
694 /* Return up to 'len' payload bytes received in 'type' records.
695 * 'type' is one of the following:
697 * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
698 * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
699 * - 0 (during a shutdown, no data has to be returned)
701 * If we don't have stored data to work from, read a SSL/TLS record first
702 * (possibly multiple records if we still don't have anything to return).
704 * This function must handle any surprises the peer may have for us, such as
705 * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
706 * a surprise, but handled as if it were), or renegotiation requests.
707 * Also if record payloads contain fragments too small to process, we store
708 * them until there is enough for the respective protocol (the record protocol
709 * may use arbitrary fragmentation and even interleaving):
710 * Change cipher spec protocol
711 * just 1 byte needed, no need for keeping anything stored
713 * 2 bytes needed (AlertLevel, AlertDescription)
715 * 4 bytes needed (HandshakeType, uint24 length) -- we just have
716 * to detect unexpected Client Hello and Hello Request messages
717 * here, anything else is handled by higher layers
718 * Application data protocol
719 * none of our business
721 int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
726 void (*cb)(const SSL *ssl,int type2,int val)=NULL;
728 if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
729 if (!ssl3_setup_buffers(s))
732 /* XXX: check what the second '&& type' is about */
733 if ((type && (type != SSL3_RT_APPLICATION_DATA) &&
734 (type != SSL3_RT_HANDSHAKE) && type) ||
735 (peek && (type != SSL3_RT_APPLICATION_DATA)))
737 SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
741 /* check whether there's a handshake message (client hello?) waiting */
742 if ( (ret = have_handshake_fragment(s, type, buf, len, peek)))
745 /* Now s->d1->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
747 if (!s->in_handshake && SSL_in_init(s))
749 /* type == SSL3_RT_APPLICATION_DATA */
750 i=s->handshake_func(s);
751 if (i < 0) return(i);
754 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
760 s->rwstate=SSL_NOTHING;
762 /* s->s3->rrec.type - is the type of record
763 * s->s3->rrec.data, - data
764 * s->s3->rrec.off, - offset into 'data' for next read
765 * s->s3->rrec.length, - number of bytes. */
768 /* We are not handshaking and have no data yet,
769 * so process data buffered during the last handshake
770 * in advance, if any.
772 if (s->state == SSL_ST_OK && rr->length == 0)
775 item = pqueue_pop(s->d1->buffered_app_data.q);
778 dtls1_copy_record(s, item);
780 OPENSSL_free(item->data);
785 /* Check for timeout */
786 if (dtls1_handle_timeout(s) > 0)
789 /* get new packet if necessary */
790 if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
792 ret=dtls1_get_record(s);
795 ret = dtls1_read_failed(s, ret);
796 /* anything other than a timeout is an error */
804 /* we now have a packet which can be read and processed */
806 if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
807 * reset by ssl3_get_finished */
808 && (rr->type != SSL3_RT_HANDSHAKE))
810 /* We now have application data between CCS and Finished.
811 * Most likely the packets were reordered on their way, so
812 * buffer the application data for later processing rather
813 * than dropping the connection.
815 dtls1_buffer_record(s, &(s->d1->buffered_app_data), rr->seq_num);
820 /* If the other end has shut down, throw anything we read away
821 * (even in 'peek' mode) */
822 if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
825 s->rwstate=SSL_NOTHING;
830 if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
832 /* make sure that we are not getting application data when we
833 * are doing a handshake for the first time */
834 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
835 (s->enc_read_ctx == NULL))
837 al=SSL_AD_UNEXPECTED_MESSAGE;
838 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
842 if (len <= 0) return(len);
844 if ((unsigned int)len > rr->length)
847 n = (unsigned int)len;
849 memcpy(buf,&(rr->data[rr->off]),n);
856 s->rstate=SSL_ST_READ_HEADER;
864 /* If we get here, then type != rr->type; if we have a handshake
865 * message, then it was unexpected (Hello Request or Client Hello). */
867 /* In case of record types for which we have 'fragment' storage,
868 * fill that so that we can process the data at a fixed place.
871 unsigned int k, dest_maxlen = 0;
872 unsigned char *dest = NULL;
873 unsigned int *dest_len = NULL;
875 if (rr->type == SSL3_RT_HANDSHAKE)
877 dest_maxlen = sizeof s->d1->handshake_fragment;
878 dest = s->d1->handshake_fragment;
879 dest_len = &s->d1->handshake_fragment_len;
881 else if (rr->type == SSL3_RT_ALERT)
883 dest_maxlen = sizeof(s->d1->alert_fragment);
884 dest = s->d1->alert_fragment;
885 dest_len = &s->d1->alert_fragment_len;
887 /* else it's a CCS message, or application data or wrong */
888 else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC)
890 /* Application data while renegotiating
891 * is allowed. Try again reading.
893 if (rr->type == SSL3_RT_APPLICATION_DATA)
896 s->s3->in_read_app_data=2;
898 s->rwstate=SSL_READING;
899 BIO_clear_retry_flags(bio);
900 BIO_set_retry_read(bio);
904 /* Not certain if this is the right error handling */
905 al=SSL_AD_UNEXPECTED_MESSAGE;
906 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
912 /* XDTLS: In a pathalogical case, the Client Hello
913 * may be fragmented--don't always expect dest_maxlen bytes */
914 if ( rr->length < dest_maxlen)
916 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
918 * for normal alerts rr->length is 2, while
919 * dest_maxlen is 7 if we were to handle this
920 * non-existing alert...
924 s->rstate=SSL_ST_READ_HEADER;
929 /* now move 'n' bytes: */
930 for ( k = 0; k < dest_maxlen; k++)
932 dest[k] = rr->data[rr->off++];
935 *dest_len = dest_maxlen;
939 /* s->d1->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE;
940 * s->d1->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT.
941 * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
943 /* If we are a client, check for an incoming 'Hello Request': */
945 (s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
946 (s->d1->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
947 (s->session != NULL) && (s->session->cipher != NULL))
949 s->d1->handshake_fragment_len = 0;
951 if ((s->d1->handshake_fragment[1] != 0) ||
952 (s->d1->handshake_fragment[2] != 0) ||
953 (s->d1->handshake_fragment[3] != 0))
955 al=SSL_AD_DECODE_ERROR;
956 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
960 /* no need to check sequence number on HELLO REQUEST messages */
963 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
964 s->d1->handshake_fragment, 4, s, s->msg_callback_arg);
966 if (SSL_is_init_finished(s) &&
967 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
971 if (ssl3_renegotiate_check(s))
973 i=s->handshake_func(s);
974 if (i < 0) return(i);
977 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
981 if (!(s->mode & SSL_MODE_AUTO_RETRY))
983 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
986 /* In the case where we try to read application data,
987 * but we trigger an SSL handshake, we return -1 with
988 * the retry option set. Otherwise renegotiation may
989 * cause nasty problems in the blocking world */
990 s->rwstate=SSL_READING;
992 BIO_clear_retry_flags(bio);
993 BIO_set_retry_read(bio);
999 /* we either finished a handshake or ignored the request,
1000 * now try again to obtain the (application) data we were asked for */
1004 if (s->d1->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH)
1006 int alert_level = s->d1->alert_fragment[0];
1007 int alert_descr = s->d1->alert_fragment[1];
1009 s->d1->alert_fragment_len = 0;
1011 if (s->msg_callback)
1012 s->msg_callback(0, s->version, SSL3_RT_ALERT,
1013 s->d1->alert_fragment, 2, s, s->msg_callback_arg);
1015 if (s->info_callback != NULL)
1016 cb=s->info_callback;
1017 else if (s->ctx->info_callback != NULL)
1018 cb=s->ctx->info_callback;
1022 j = (alert_level << 8) | alert_descr;
1023 cb(s, SSL_CB_READ_ALERT, j);
1026 if (alert_level == 1) /* warning */
1028 s->s3->warn_alert = alert_descr;
1029 if (alert_descr == SSL_AD_CLOSE_NOTIFY)
1031 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
1035 /* XXX: this is a possible improvement in the future */
1036 /* now check if it's a missing record */
1037 if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
1040 unsigned int frag_off;
1041 unsigned char *p = &(s->d1->alert_fragment[2]);
1046 dtls1_retransmit_message(s,
1047 dtls1_get_queue_priority(frag->msg_header.seq, 0),
1049 if ( ! found && SSL_in_init(s))
1051 /* fprintf( stderr,"in init = %d\n", SSL_in_init(s)); */
1052 /* requested a message not yet sent,
1053 send an alert ourselves */
1054 ssl3_send_alert(s,SSL3_AL_WARNING,
1055 DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
1060 else if (alert_level == 2) /* fatal */
1064 s->rwstate=SSL_NOTHING;
1065 s->s3->fatal_alert = alert_descr;
1066 SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1067 BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1068 ERR_add_error_data(2,"SSL alert number ",tmp);
1069 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1070 SSL_CTX_remove_session(s->ctx,s->session);
1075 al=SSL_AD_ILLEGAL_PARAMETER;
1076 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1083 if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1085 s->rwstate=SSL_NOTHING;
1090 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1092 struct ccs_header_st ccs_hdr;
1093 unsigned int ccs_hdr_len = DTLS1_CCS_HEADER_LENGTH;
1095 dtls1_get_ccs_header(rr->data, &ccs_hdr);
1097 if (s->version == DTLS1_BAD_VER)
1100 /* 'Change Cipher Spec' is just a single byte, so we know
1101 * exactly what the record payload has to look like */
1102 /* XDTLS: check that epoch is consistent */
1103 if ( (rr->length != ccs_hdr_len) ||
1104 (rr->off != 0) || (rr->data[0] != SSL3_MT_CCS))
1106 i=SSL_AD_ILLEGAL_PARAMETER;
1107 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1113 if (s->msg_callback)
1114 s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,
1115 rr->data, 1, s, s->msg_callback_arg);
1117 /* We can't process a CCS now, because previous handshake
1118 * messages are still missing, so just drop it.
1120 if (!s->d1->change_cipher_spec_ok)
1125 s->d1->change_cipher_spec_ok = 0;
1127 s->s3->change_cipher_spec=1;
1128 if (!ssl3_do_change_cipher_spec(s))
1131 /* do this whenever CCS is processed */
1132 dtls1_reset_seq_numbers(s, SSL3_CC_READ);
1134 if (s->version == DTLS1_BAD_VER)
1135 s->d1->handshake_read_seq++;
1140 /* Unexpected handshake message (Client Hello, or protocol violation) */
1141 if ((s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
1144 struct hm_header_st msg_hdr;
1146 /* this may just be a stale retransmit */
1147 dtls1_get_message_header(rr->data, &msg_hdr);
1148 if( rr->epoch != s->d1->r_epoch)
1154 /* If we are server, we may have a repeated FINISHED of the
1155 * client here, then retransmit our CCS and FINISHED.
1157 if (msg_hdr.type == SSL3_MT_FINISHED)
1159 dtls1_retransmit_buffered_messages(s);
1164 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1165 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1167 #if 0 /* worked only because C operator preferences are not as expected (and
1168 * because this is not really needed for clients except for detecting
1169 * protocol violations): */
1170 s->state=SSL_ST_BEFORE|(s->server)
1174 s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1178 i=s->handshake_func(s);
1179 if (i < 0) return(i);
1182 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1186 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1188 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1191 /* In the case where we try to read application data,
1192 * but we trigger an SSL handshake, we return -1 with
1193 * the retry option set. Otherwise renegotiation may
1194 * cause nasty problems in the blocking world */
1195 s->rwstate=SSL_READING;
1196 bio=SSL_get_rbio(s);
1197 BIO_clear_retry_flags(bio);
1198 BIO_set_retry_read(bio);
1208 #ifndef OPENSSL_NO_TLS
1209 /* TLS just ignores unknown message types */
1210 if (s->version == TLS1_VERSION)
1216 al=SSL_AD_UNEXPECTED_MESSAGE;
1217 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1219 case SSL3_RT_CHANGE_CIPHER_SPEC:
1221 case SSL3_RT_HANDSHAKE:
1222 /* we already handled all of these, with the possible exception
1223 * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1224 * should not happen when type != rr->type */
1225 al=SSL_AD_UNEXPECTED_MESSAGE;
1226 SSLerr(SSL_F_DTLS1_READ_BYTES,ERR_R_INTERNAL_ERROR);
1228 case SSL3_RT_APPLICATION_DATA:
1229 /* At this point, we were expecting handshake data,
1230 * but have application data. If the library was
1231 * running inside ssl3_read() (i.e. in_read_app_data
1232 * is set) and it makes sense to read application data
1233 * at this point (session renegotiation not yet started),
1234 * we will indulge it.
1236 if (s->s3->in_read_app_data &&
1237 (s->s3->total_renegotiations != 0) &&
1239 (s->state & SSL_ST_CONNECT) &&
1240 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1241 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1243 (s->state & SSL_ST_ACCEPT) &&
1244 (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1245 (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1249 s->s3->in_read_app_data=2;
1254 al=SSL_AD_UNEXPECTED_MESSAGE;
1255 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1262 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1268 dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len)
1272 if (SSL_in_init(s) && !s->in_handshake)
1274 i=s->handshake_func(s);
1275 if (i < 0) return(i);
1278 SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1283 if (len > SSL3_RT_MAX_PLAIN_LENGTH)
1285 SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_DTLS_MESSAGE_TOO_BIG);
1289 i = dtls1_write_bytes(s, type, buf_, len);
1294 /* this only happens when a client hello is received and a handshake
1297 have_handshake_fragment(SSL *s, int type, unsigned char *buf,
1301 if ((type == SSL3_RT_HANDSHAKE) && (s->d1->handshake_fragment_len > 0))
1302 /* (partially) satisfy request from storage */
1304 unsigned char *src = s->d1->handshake_fragment;
1305 unsigned char *dst = buf;
1310 while ((len > 0) && (s->d1->handshake_fragment_len > 0))
1313 len--; s->d1->handshake_fragment_len--;
1316 /* move any remaining fragment bytes: */
1317 for (k = 0; k < s->d1->handshake_fragment_len; k++)
1318 s->d1->handshake_fragment[k] = *src++;
1328 /* Call this to write data in records of type 'type'
1329 * It will return <= 0 if not all data has been sent or non-blocking IO.
1331 int dtls1_write_bytes(SSL *s, int type, const void *buf, int len)
1335 OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH);
1336 s->rwstate=SSL_NOTHING;
1337 i=do_dtls1_write(s, type, buf, len, 0);
1341 int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len, int create_empty_fragment)
1343 unsigned char *p,*pseq;
1344 int i,mac_size,clear=0;
1351 /* first check if there is a SSL3_BUFFER still being written
1352 * out. This will happen with non blocking IO */
1353 if (s->s3->wbuf.left != 0)
1355 OPENSSL_assert(0); /* XDTLS: want to see if we ever get here */
1356 return(ssl3_write_pending(s,type,buf,len));
1359 /* If we have an alert to send, lets send it */
1360 if (s->s3->alert_dispatch)
1362 i=s->method->ssl_dispatch_alert(s);
1365 /* if it went, fall through and send more stuff */
1368 if (len == 0 && !create_empty_fragment)
1375 if ( (sess == NULL) ||
1376 (s->enc_write_ctx == NULL) ||
1377 (EVP_MD_CTX_md(s->write_hash) == NULL))
1384 mac_size=EVP_MD_CTX_size(s->write_hash);
1389 /* DTLS implements explicit IV, so no need for empty fragments */
1391 /* 'create_empty_fragment' is true only when this function calls itself */
1392 if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done
1393 && SSL_version(s) != DTLS1_VERSION && SSL_version(s) != DTLS1_BAD_VER)
1395 /* countermeasure against known-IV weakness in CBC ciphersuites
1396 * (see http://www.openssl.org/~bodo/tls-cbc.txt)
1399 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
1401 /* recursive function call with 'create_empty_fragment' set;
1402 * this prepares and buffers the data for an empty fragment
1403 * (these 'prefix_len' bytes are sent out later
1404 * together with the actual payload) */
1405 prefix_len = s->method->do_ssl_write(s, type, buf, 0, 1);
1406 if (prefix_len <= 0)
1409 if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE)
1411 /* insufficient space */
1412 SSLerr(SSL_F_DO_DTLS1_WRITE, ERR_R_INTERNAL_ERROR);
1417 s->s3->empty_fragment_done = 1;
1420 p = wb->buf + prefix_len;
1422 /* write the header */
1427 *(p++)=(s->version>>8);
1428 *(p++)=s->version&0xff;
1430 /* field where we are to write out packet epoch, seq num and len */
1434 /* lets setup the record stuff. */
1436 /* Make space for the explicit IV in case of CBC.
1437 * (this is a bit of a boundary violation, but what the heck).
1439 if ( s->enc_write_ctx &&
1440 (EVP_CIPHER_mode( s->enc_write_ctx->cipher ) & EVP_CIPH_CBC_MODE))
1441 bs = EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
1445 wr->data=p + bs; /* make room for IV in case of CBC */
1446 wr->length=(int)len;
1447 wr->input=(unsigned char *)buf;
1449 /* we now 'read' from wr->input, wr->length bytes into
1452 /* first we compress */
1453 if (s->compress != NULL)
1455 if (!ssl3_do_compress(s))
1457 SSLerr(SSL_F_DO_DTLS1_WRITE,SSL_R_COMPRESSION_FAILURE);
1463 memcpy(wr->data,wr->input,wr->length);
1467 /* we should still have the output to wr->data and the input
1468 * from wr->input. Length should be wr->length.
1469 * wr->data still points in the wb->buf */
1473 if(s->method->ssl3_enc->mac(s,&(p[wr->length + bs]),1) < 0)
1475 wr->length+=mac_size;
1478 /* this is true regardless of mac size */
1483 /* ssl3_enc can only have an error on read */
1484 if (bs) /* bs != 0 in case of CBC */
1486 RAND_pseudo_bytes(p,bs);
1487 /* master IV and last CBC residue stand for
1488 * the rest of randomness */
1492 s->method->ssl3_enc->enc(s,1);
1494 /* record length after mac and block padding */
1495 /* if (type == SSL3_RT_APPLICATION_DATA ||
1496 (type == SSL3_RT_ALERT && ! SSL_in_init(s))) */
1498 /* there's only one epoch between handshake and app data */
1500 s2n(s->d1->w_epoch, pseq);
1504 s2n(s->d1->handshake_epoch, pseq); */
1506 memcpy(pseq, &(s->s3->write_sequence[2]), 6);
1508 s2n(wr->length,pseq);
1510 /* we should now have
1511 * wr->data pointing to the encrypted data, which is
1512 * wr->length long */
1513 wr->type=type; /* not needed but helps for debugging */
1514 wr->length+=DTLS1_RT_HEADER_LENGTH;
1516 #if 0 /* this is now done at the message layer */
1517 /* buffer the record, making it easy to handle retransmits */
1518 if ( type == SSL3_RT_HANDSHAKE || type == SSL3_RT_CHANGE_CIPHER_SPEC)
1519 dtls1_buffer_record(s, wr->data, wr->length,
1520 *((PQ_64BIT *)&(s->s3->write_sequence[0])));
1523 ssl3_record_sequence_update(&(s->s3->write_sequence[0]));
1525 if (create_empty_fragment)
1527 /* we are in a recursive call;
1528 * just return the length, don't write out anything here
1533 /* now let's set up wb */
1534 wb->left = prefix_len + wr->length;
1537 /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
1538 s->s3->wpend_tot=len;
1539 s->s3->wpend_buf=buf;
1540 s->s3->wpend_type=type;
1541 s->s3->wpend_ret=len;
1543 /* we now just need to write the buffer */
1544 return ssl3_write_pending(s,type,buf,len);
1551 static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap)
1555 const unsigned char *seq = s->s3->read_sequence;
1557 cmp = satsub64be(seq,bitmap->max_seq_num);
1560 memcpy (s->s3->rrec.seq_num,seq,8);
1561 return 1; /* this record in new */
1564 if (shift >= sizeof(bitmap->map)*8)
1565 return 0; /* stale, outside the window */
1566 else if (bitmap->map & (1UL<<shift))
1567 return 0; /* record previously received */
1569 memcpy (s->s3->rrec.seq_num,seq,8);
1574 static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap)
1578 const unsigned char *seq = s->s3->read_sequence;
1580 cmp = satsub64be(seq,bitmap->max_seq_num);
1584 if (shift < sizeof(bitmap->map)*8)
1585 bitmap->map <<= shift, bitmap->map |= 1UL;
1588 memcpy(bitmap->max_seq_num,seq,8);
1592 if (shift < sizeof(bitmap->map)*8)
1593 bitmap->map |= 1UL<<shift;
1598 int dtls1_dispatch_alert(SSL *s)
1601 void (*cb)(const SSL *ssl,int type,int val)=NULL;
1602 unsigned char buf[DTLS1_AL_HEADER_LENGTH];
1603 unsigned char *ptr = &buf[0];
1605 s->s3->alert_dispatch=0;
1607 memset(buf, 0x00, sizeof(buf));
1608 *ptr++ = s->s3->send_alert[0];
1609 *ptr++ = s->s3->send_alert[1];
1611 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1612 if (s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
1614 s2n(s->d1->handshake_read_seq, ptr);
1616 if ( s->d1->r_msg_hdr.frag_off == 0) /* waiting for a new msg */
1619 s2n(s->d1->r_msg_hdr.seq, ptr); /* partial msg read */
1623 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);
1625 l2n3(s->d1->r_msg_hdr.frag_off, ptr);
1629 i = do_dtls1_write(s, SSL3_RT_ALERT, &buf[0], sizeof(buf), 0);
1632 s->s3->alert_dispatch=1;
1633 /* fprintf( stderr, "not done with alert\n" ); */
1637 if (s->s3->send_alert[0] == SSL3_AL_FATAL
1638 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1639 || s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1642 (void)BIO_flush(s->wbio);
1644 if (s->msg_callback)
1645 s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert,
1646 2, s, s->msg_callback_arg);
1648 if (s->info_callback != NULL)
1649 cb=s->info_callback;
1650 else if (s->ctx->info_callback != NULL)
1651 cb=s->ctx->info_callback;
1655 j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1656 cb(s,SSL_CB_WRITE_ALERT,j);
1663 static DTLS1_BITMAP *
1664 dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, unsigned int *is_next_epoch)
1669 /* In current epoch, accept HM, CCS, DATA, & ALERT */
1670 if (rr->epoch == s->d1->r_epoch)
1671 return &s->d1->bitmap;
1673 /* Only HM and ALERT messages can be from the next epoch */
1674 else if (rr->epoch == (unsigned long)(s->d1->r_epoch + 1) &&
1675 (rr->type == SSL3_RT_HANDSHAKE ||
1676 rr->type == SSL3_RT_ALERT))
1679 return &s->d1->next_bitmap;
1687 dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, unsigned short *priority,
1688 unsigned long *offset)
1691 /* alerts are passed up immediately */
1692 if ( rr->type == SSL3_RT_APPLICATION_DATA ||
1693 rr->type == SSL3_RT_ALERT)
1696 /* Only need to buffer if a handshake is underway.
1697 * (this implies that Hello Request and Client Hello are passed up
1699 if ( SSL_in_init(s))
1701 unsigned char *data = rr->data;
1702 /* need to extract the HM/CCS sequence number here */
1703 if ( rr->type == SSL3_RT_HANDSHAKE ||
1704 rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1706 unsigned short seq_num;
1707 struct hm_header_st msg_hdr;
1708 struct ccs_header_st ccs_hdr;
1710 if ( rr->type == SSL3_RT_HANDSHAKE)
1712 dtls1_get_message_header(data, &msg_hdr);
1713 seq_num = msg_hdr.seq;
1714 *offset = msg_hdr.frag_off;
1718 dtls1_get_ccs_header(data, &ccs_hdr);
1719 seq_num = ccs_hdr.seq;
1723 /* this is either a record we're waiting for, or a
1724 * retransmit of something we happened to previously
1725 * receive (higher layers will drop the repeat silently */
1726 if ( seq_num < s->d1->handshake_read_seq)
1728 if (rr->type == SSL3_RT_HANDSHAKE &&
1729 seq_num == s->d1->handshake_read_seq &&
1730 msg_hdr.frag_off < s->d1->r_msg_hdr.frag_off)
1732 else if ( seq_num == s->d1->handshake_read_seq &&
1733 (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC ||
1734 msg_hdr.frag_off == s->d1->r_msg_hdr.frag_off))
1738 *priority = seq_num;
1742 else /* unknown record type */
1751 dtls1_reset_seq_numbers(SSL *s, int rw)
1754 unsigned int seq_bytes = sizeof(s->s3->read_sequence);
1756 if ( rw & SSL3_CC_READ)
1758 seq = s->s3->read_sequence;
1760 memcpy(&(s->d1->bitmap), &(s->d1->next_bitmap), sizeof(DTLS1_BITMAP));
1761 memset(&(s->d1->next_bitmap), 0x00, sizeof(DTLS1_BITMAP));
1765 seq = s->s3->write_sequence;
1766 memcpy(s->d1->last_write_sequence, seq, sizeof(s->s3->write_sequence));
1770 memset(seq, 0x00, seq_bytes);
1775 dtls1_clear_timeouts(SSL *s)
1777 memset(&(s->d1->timeout), 0x00, sizeof(struct dtls1_timeout_st));