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 /* Check if epoch is current. */
300 if (s->d1->unprocessed_rcds.epoch != s->d1->r_epoch)
301 return(1); /* Nothing to do. */
303 /* Process all the records. */
304 while (pqueue_peek(s->d1->unprocessed_rcds.q))
306 dtls1_get_unprocessed_record(s);
307 if ( ! dtls1_process_record(s))
309 dtls1_buffer_record(s, &(s->d1->processed_rcds),
310 s->s3->rrec.seq_num);
314 /* sync epoch numbers once all the unprocessed records
315 * have been processed */
316 s->d1->processed_rcds.epoch = s->d1->r_epoch;
317 s->d1->unprocessed_rcds.epoch = s->d1->r_epoch + 1;
326 dtls1_get_buffered_record(SSL *s)
330 (((PQ_64BIT)s->d1->handshake_read_seq) << 32) |
331 ((PQ_64BIT)s->d1->r_msg_hdr.frag_off);
333 if ( ! SSL_in_init(s)) /* if we're not (re)negotiating,
338 item = pqueue_peek(s->d1->rcvd_records);
339 if (item && item->priority == priority)
341 /* Check if we've received the record of interest. It must be
342 * a handshake record, since data records as passed up without
344 DTLS1_RECORD_DATA *rdata;
345 item = pqueue_pop(s->d1->rcvd_records);
346 rdata = (DTLS1_RECORD_DATA *)item->data;
348 if (s->s3->rbuf.buf != NULL)
349 OPENSSL_free(s->s3->rbuf.buf);
351 s->packet = rdata->packet;
352 s->packet_length = rdata->packet_length;
353 memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
354 memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
356 OPENSSL_free(item->data);
359 /* s->d1->next_expected_seq_num++; */
369 dtls1_process_record(SSL *s)
376 unsigned int mac_size;
377 unsigned char md[EVP_MAX_MD_SIZE];
383 /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
384 * and we have that many bytes in s->packet
386 rr->input= &(s->packet[DTLS1_RT_HEADER_LENGTH]);
388 /* ok, we can now read from 's->packet' data into 'rr'
389 * rr->input points at rr->length bytes, which
390 * need to be copied into rr->data by either
391 * the decryption or by the decompression
392 * When the data is 'copied' into the rr->data buffer,
393 * rr->input will be pointed at the new buffer */
395 /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
396 * rr->length bytes of encrypted compressed stuff. */
398 /* check is not needed I believe */
399 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
401 al=SSL_AD_RECORD_OVERFLOW;
402 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
406 /* decrypt in place in 'rr->input' */
409 enc_err = s->method->ssl3_enc->enc(s,0);
413 /* SSLerr() and ssl3_send_alert() have been called */
416 /* otherwise enc_err == -1 */
417 al=SSL_AD_BAD_RECORD_MAC;
422 printf("dec %d\n",rr->length);
423 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
427 /* r->length is now the compressed data plus mac */
428 if ( (sess == NULL) ||
429 (s->enc_read_ctx == NULL) ||
430 (s->read_hash == NULL))
435 /* !clear => s->read_hash != NULL => mac_size != -1 */
437 t=EVP_MD_CTX_size(s->read_hash);
438 OPENSSL_assert(t >= 0);
441 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+mac_size)
443 #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
444 al=SSL_AD_RECORD_OVERFLOW;
445 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
451 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
452 if (rr->length < mac_size)
454 #if 0 /* OK only for stream ciphers */
455 al=SSL_AD_DECODE_ERROR;
456 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_LENGTH_TOO_SHORT);
462 rr->length-=mac_size;
463 i=s->method->ssl3_enc->mac(s,md,0);
464 if (i < 0 || memcmp(md,&(rr->data[rr->length]),mac_size) != 0)
470 /* r->length is now just compressed */
471 if (s->expand != NULL)
473 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH)
475 al=SSL_AD_RECORD_OVERFLOW;
476 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
479 if (!ssl3_do_uncompress(s))
481 al=SSL_AD_DECOMPRESSION_FAILURE;
482 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_BAD_DECOMPRESSION);
487 if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH)
489 al=SSL_AD_RECORD_OVERFLOW;
490 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
495 /* So at this point the following is true
496 * ssl->s3->rrec.type is the type of record
497 * ssl->s3->rrec.length == number of bytes in record
498 * ssl->s3->rrec.off == offset to first valid byte
499 * ssl->s3->rrec.data == where to take bytes from, increment
503 /* we have pulled in a full packet so zero things */
505 dtls1_record_bitmap_update(s, &(s->d1->bitmap));/* Mark receipt of record. */
509 ssl3_send_alert(s,SSL3_AL_FATAL,al);
515 /* Call this to get a new input record.
516 * It will return <= 0 if more data is needed, normally due to an error
517 * or non-blocking IO.
518 * When it finishes, one packet has been decoded and can be found in
519 * ssl->s3->rrec.type - is the type of record
520 * ssl->s3->rrec.data, - data
521 * ssl->s3->rrec.length, - number of bytes
523 /* used only by dtls1_read_bytes */
524 int dtls1_get_record(SSL *s)
526 int ssl_major,ssl_minor;
529 unsigned char *p = NULL;
530 unsigned short version;
531 DTLS1_BITMAP *bitmap;
532 unsigned int is_next_epoch;
536 /* The epoch may have changed. If so, process all the
537 * pending records. This is a non-blocking operation. */
538 dtls1_process_buffered_records(s);
540 /* if we're renegotiating, then there may be buffered records */
541 if (dtls1_get_processed_record(s))
544 /* get something from the wire */
546 /* check if we have the header */
547 if ( (s->rstate != SSL_ST_READ_BODY) ||
548 (s->packet_length < DTLS1_RT_HEADER_LENGTH))
550 n=ssl3_read_n(s, DTLS1_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
551 /* read timeout is handled by dtls1_read_bytes */
552 if (n <= 0) return(n); /* error or non-blocking */
554 /* this packet contained a partial record, dump it */
555 if (s->packet_length != DTLS1_RT_HEADER_LENGTH)
557 s->packet_length = 0;
561 s->rstate=SSL_ST_READ_BODY;
565 /* Pull apart the header into the DTLS1_RECORD */
569 version=(ssl_major<<8)|ssl_minor;
571 /* sequence number is 64 bits, with top 2 bytes = epoch */
574 memcpy(&(s->s3->read_sequence[2]), p, 6);
579 /* Lets check version */
580 if (!s->first_packet)
582 if (version != s->version)
584 /* unexpected version, silently discard */
586 s->packet_length = 0;
591 if ((version & 0xff00) != (s->version & 0xff00))
593 /* wrong version, silently discard record */
595 s->packet_length = 0;
599 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
601 /* record too long, silently discard it */
603 s->packet_length = 0;
607 /* now s->rstate == SSL_ST_READ_BODY */
610 /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
612 if (rr->length > s->packet_length-DTLS1_RT_HEADER_LENGTH)
614 /* now s->packet_length == DTLS1_RT_HEADER_LENGTH */
616 n=ssl3_read_n(s,i,i,1);
617 if (n <= 0) return(n); /* error or non-blocking io */
619 /* this packet contained a partial record, dump it */
623 s->packet_length = 0;
627 /* now n == rr->length,
628 * and s->packet_length == DTLS1_RT_HEADER_LENGTH + rr->length */
630 s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
632 /* match epochs. NULL means the packet is dropped on the floor */
633 bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch);
637 s->packet_length = 0; /* dump this record */
638 goto again; /* get another record */
641 /* Check whether this is a repeat, or aged record.
642 * Don't check if we're listening and this message is
643 * a ClientHello. They can look as if they're replayed,
644 * since they arrive from different connections and
645 * would be dropped unnecessarily.
647 if (!(s->d1->listen && rr->type == SSL3_RT_HANDSHAKE &&
648 *p == SSL3_MT_CLIENT_HELLO) &&
649 !dtls1_record_replay_check(s, bitmap))
652 s->packet_length=0; /* dump this record */
653 goto again; /* get another record */
656 /* just read a 0 length packet */
657 if (rr->length == 0) goto again;
659 /* If this record is from the next epoch (either HM or ALERT),
660 * and a handshake is currently in progress, buffer it since it
661 * cannot be processed at this time. */
664 if (SSL_in_init(s) || s->in_handshake)
666 dtls1_buffer_record(s, &(s->d1->unprocessed_rcds), rr->seq_num);
669 s->packet_length = 0;
673 if (!dtls1_process_record(s))
676 s->packet_length = 0; /* dump this record */
677 goto again; /* get another record */
680 dtls1_clear_timeouts(s); /* done waiting */
685 /* Return up to 'len' payload bytes received in 'type' records.
686 * 'type' is one of the following:
688 * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
689 * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
690 * - 0 (during a shutdown, no data has to be returned)
692 * If we don't have stored data to work from, read a SSL/TLS record first
693 * (possibly multiple records if we still don't have anything to return).
695 * This function must handle any surprises the peer may have for us, such as
696 * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
697 * a surprise, but handled as if it were), or renegotiation requests.
698 * Also if record payloads contain fragments too small to process, we store
699 * them until there is enough for the respective protocol (the record protocol
700 * may use arbitrary fragmentation and even interleaving):
701 * Change cipher spec protocol
702 * just 1 byte needed, no need for keeping anything stored
704 * 2 bytes needed (AlertLevel, AlertDescription)
706 * 4 bytes needed (HandshakeType, uint24 length) -- we just have
707 * to detect unexpected Client Hello and Hello Request messages
708 * here, anything else is handled by higher layers
709 * Application data protocol
710 * none of our business
712 int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
717 void (*cb)(const SSL *ssl,int type2,int val)=NULL;
719 if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
720 if (!ssl3_setup_buffers(s))
723 /* XXX: check what the second '&& type' is about */
724 if ((type && (type != SSL3_RT_APPLICATION_DATA) &&
725 (type != SSL3_RT_HANDSHAKE) && type) ||
726 (peek && (type != SSL3_RT_APPLICATION_DATA)))
728 SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
732 /* check whether there's a handshake message (client hello?) waiting */
733 if ( (ret = have_handshake_fragment(s, type, buf, len, peek)))
736 /* Now s->d1->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
738 if (!s->in_handshake && SSL_in_init(s))
740 /* type == SSL3_RT_APPLICATION_DATA */
741 i=s->handshake_func(s);
742 if (i < 0) return(i);
745 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
751 s->rwstate=SSL_NOTHING;
753 /* s->s3->rrec.type - is the type of record
754 * s->s3->rrec.data, - data
755 * s->s3->rrec.off, - offset into 'data' for next read
756 * s->s3->rrec.length, - number of bytes. */
759 /* We are not handshaking and have no data yet,
760 * so process data buffered during the last handshake
761 * in advance, if any.
763 if (s->state == SSL_ST_OK && rr->length == 0)
766 item = pqueue_pop(s->d1->buffered_app_data.q);
769 dtls1_copy_record(s, item);
771 OPENSSL_free(item->data);
776 /* Check for timeout */
777 if (dtls1_handle_timeout(s) > 0)
780 /* get new packet if necessary */
781 if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
783 ret=dtls1_get_record(s);
786 ret = dtls1_read_failed(s, ret);
787 /* anything other than a timeout is an error */
795 /* we now have a packet which can be read and processed */
797 if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
798 * reset by ssl3_get_finished */
799 && (rr->type != SSL3_RT_HANDSHAKE))
801 /* We now have application data between CCS and Finished.
802 * Most likely the packets were reordered on their way, so
803 * buffer the application data for later processing rather
804 * than dropping the connection.
806 dtls1_buffer_record(s, &(s->d1->buffered_app_data), rr->seq_num);
811 /* If the other end has shut down, throw anything we read away
812 * (even in 'peek' mode) */
813 if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
816 s->rwstate=SSL_NOTHING;
821 if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
823 /* make sure that we are not getting application data when we
824 * are doing a handshake for the first time */
825 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
826 (s->enc_read_ctx == NULL))
828 al=SSL_AD_UNEXPECTED_MESSAGE;
829 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
833 if (len <= 0) return(len);
835 if ((unsigned int)len > rr->length)
838 n = (unsigned int)len;
840 memcpy(buf,&(rr->data[rr->off]),n);
847 s->rstate=SSL_ST_READ_HEADER;
855 /* If we get here, then type != rr->type; if we have a handshake
856 * message, then it was unexpected (Hello Request or Client Hello). */
858 /* In case of record types for which we have 'fragment' storage,
859 * fill that so that we can process the data at a fixed place.
862 unsigned int k, dest_maxlen = 0;
863 unsigned char *dest = NULL;
864 unsigned int *dest_len = NULL;
866 if (rr->type == SSL3_RT_HANDSHAKE)
868 dest_maxlen = sizeof s->d1->handshake_fragment;
869 dest = s->d1->handshake_fragment;
870 dest_len = &s->d1->handshake_fragment_len;
872 else if (rr->type == SSL3_RT_ALERT)
874 dest_maxlen = sizeof(s->d1->alert_fragment);
875 dest = s->d1->alert_fragment;
876 dest_len = &s->d1->alert_fragment_len;
878 /* else it's a CCS message, or application data or wrong */
879 else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC)
881 /* Application data while renegotiating
882 * is allowed. Try again reading.
884 if (rr->type == SSL3_RT_APPLICATION_DATA)
887 s->s3->in_read_app_data=2;
889 s->rwstate=SSL_READING;
890 BIO_clear_retry_flags(bio);
891 BIO_set_retry_read(bio);
895 /* Not certain if this is the right error handling */
896 al=SSL_AD_UNEXPECTED_MESSAGE;
897 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
903 /* XDTLS: In a pathalogical case, the Client Hello
904 * may be fragmented--don't always expect dest_maxlen bytes */
905 if ( rr->length < dest_maxlen)
907 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
909 * for normal alerts rr->length is 2, while
910 * dest_maxlen is 7 if we were to handle this
911 * non-existing alert...
915 s->rstate=SSL_ST_READ_HEADER;
920 /* now move 'n' bytes: */
921 for ( k = 0; k < dest_maxlen; k++)
923 dest[k] = rr->data[rr->off++];
926 *dest_len = dest_maxlen;
930 /* s->d1->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE;
931 * s->d1->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT.
932 * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
934 /* If we are a client, check for an incoming 'Hello Request': */
936 (s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
937 (s->d1->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
938 (s->session != NULL) && (s->session->cipher != NULL))
940 s->d1->handshake_fragment_len = 0;
942 if ((s->d1->handshake_fragment[1] != 0) ||
943 (s->d1->handshake_fragment[2] != 0) ||
944 (s->d1->handshake_fragment[3] != 0))
946 al=SSL_AD_DECODE_ERROR;
947 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
951 /* no need to check sequence number on HELLO REQUEST messages */
954 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
955 s->d1->handshake_fragment, 4, s, s->msg_callback_arg);
957 if (SSL_is_init_finished(s) &&
958 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
962 if (ssl3_renegotiate_check(s))
964 i=s->handshake_func(s);
965 if (i < 0) return(i);
968 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
972 if (!(s->mode & SSL_MODE_AUTO_RETRY))
974 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
977 /* In the case where we try to read application data,
978 * but we trigger an SSL handshake, we return -1 with
979 * the retry option set. Otherwise renegotiation may
980 * cause nasty problems in the blocking world */
981 s->rwstate=SSL_READING;
983 BIO_clear_retry_flags(bio);
984 BIO_set_retry_read(bio);
990 /* we either finished a handshake or ignored the request,
991 * now try again to obtain the (application) data we were asked for */
995 if (s->d1->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH)
997 int alert_level = s->d1->alert_fragment[0];
998 int alert_descr = s->d1->alert_fragment[1];
1000 s->d1->alert_fragment_len = 0;
1002 if (s->msg_callback)
1003 s->msg_callback(0, s->version, SSL3_RT_ALERT,
1004 s->d1->alert_fragment, 2, s, s->msg_callback_arg);
1006 if (s->info_callback != NULL)
1007 cb=s->info_callback;
1008 else if (s->ctx->info_callback != NULL)
1009 cb=s->ctx->info_callback;
1013 j = (alert_level << 8) | alert_descr;
1014 cb(s, SSL_CB_READ_ALERT, j);
1017 if (alert_level == 1) /* warning */
1019 s->s3->warn_alert = alert_descr;
1020 if (alert_descr == SSL_AD_CLOSE_NOTIFY)
1022 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
1026 /* XXX: this is a possible improvement in the future */
1027 /* now check if it's a missing record */
1028 if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
1031 unsigned int frag_off;
1032 unsigned char *p = &(s->d1->alert_fragment[2]);
1037 dtls1_retransmit_message(s,
1038 dtls1_get_queue_priority(frag->msg_header.seq, 0),
1040 if ( ! found && SSL_in_init(s))
1042 /* fprintf( stderr,"in init = %d\n", SSL_in_init(s)); */
1043 /* requested a message not yet sent,
1044 send an alert ourselves */
1045 ssl3_send_alert(s,SSL3_AL_WARNING,
1046 DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
1051 else if (alert_level == 2) /* fatal */
1055 s->rwstate=SSL_NOTHING;
1056 s->s3->fatal_alert = alert_descr;
1057 SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1058 BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1059 ERR_add_error_data(2,"SSL alert number ",tmp);
1060 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1061 SSL_CTX_remove_session(s->ctx,s->session);
1066 al=SSL_AD_ILLEGAL_PARAMETER;
1067 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1074 if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1076 s->rwstate=SSL_NOTHING;
1081 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1083 struct ccs_header_st ccs_hdr;
1084 unsigned int ccs_hdr_len = DTLS1_CCS_HEADER_LENGTH;
1086 dtls1_get_ccs_header(rr->data, &ccs_hdr);
1088 if (s->version == DTLS1_BAD_VER)
1091 /* 'Change Cipher Spec' is just a single byte, so we know
1092 * exactly what the record payload has to look like */
1093 /* XDTLS: check that epoch is consistent */
1094 if ( (rr->length != ccs_hdr_len) ||
1095 (rr->off != 0) || (rr->data[0] != SSL3_MT_CCS))
1097 i=SSL_AD_ILLEGAL_PARAMETER;
1098 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1104 if (s->msg_callback)
1105 s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,
1106 rr->data, 1, s, s->msg_callback_arg);
1108 /* We can't process a CCS now, because previous handshake
1109 * messages are still missing, so just drop it.
1111 if (!s->d1->change_cipher_spec_ok)
1116 s->d1->change_cipher_spec_ok = 0;
1118 s->s3->change_cipher_spec=1;
1119 if (!ssl3_do_change_cipher_spec(s))
1122 /* do this whenever CCS is processed */
1123 dtls1_reset_seq_numbers(s, SSL3_CC_READ);
1125 if (s->version == DTLS1_BAD_VER)
1126 s->d1->handshake_read_seq++;
1131 /* Unexpected handshake message (Client Hello, or protocol violation) */
1132 if ((s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
1135 struct hm_header_st msg_hdr;
1137 /* this may just be a stale retransmit */
1138 dtls1_get_message_header(rr->data, &msg_hdr);
1139 if( rr->epoch != s->d1->r_epoch)
1145 /* If we are server, we may have a repeated FINISHED of the
1146 * client here, then retransmit our CCS and FINISHED.
1148 if (msg_hdr.type == SSL3_MT_FINISHED)
1150 dtls1_retransmit_buffered_messages(s);
1155 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1156 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1158 #if 0 /* worked only because C operator preferences are not as expected (and
1159 * because this is not really needed for clients except for detecting
1160 * protocol violations): */
1161 s->state=SSL_ST_BEFORE|(s->server)
1165 s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1169 i=s->handshake_func(s);
1170 if (i < 0) return(i);
1173 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1177 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1179 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1182 /* In the case where we try to read application data,
1183 * but we trigger an SSL handshake, we return -1 with
1184 * the retry option set. Otherwise renegotiation may
1185 * cause nasty problems in the blocking world */
1186 s->rwstate=SSL_READING;
1187 bio=SSL_get_rbio(s);
1188 BIO_clear_retry_flags(bio);
1189 BIO_set_retry_read(bio);
1199 #ifndef OPENSSL_NO_TLS
1200 /* TLS just ignores unknown message types */
1201 if (s->version == TLS1_VERSION)
1207 al=SSL_AD_UNEXPECTED_MESSAGE;
1208 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1210 case SSL3_RT_CHANGE_CIPHER_SPEC:
1212 case SSL3_RT_HANDSHAKE:
1213 /* we already handled all of these, with the possible exception
1214 * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1215 * should not happen when type != rr->type */
1216 al=SSL_AD_UNEXPECTED_MESSAGE;
1217 SSLerr(SSL_F_DTLS1_READ_BYTES,ERR_R_INTERNAL_ERROR);
1219 case SSL3_RT_APPLICATION_DATA:
1220 /* At this point, we were expecting handshake data,
1221 * but have application data. If the library was
1222 * running inside ssl3_read() (i.e. in_read_app_data
1223 * is set) and it makes sense to read application data
1224 * at this point (session renegotiation not yet started),
1225 * we will indulge it.
1227 if (s->s3->in_read_app_data &&
1228 (s->s3->total_renegotiations != 0) &&
1230 (s->state & SSL_ST_CONNECT) &&
1231 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1232 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1234 (s->state & SSL_ST_ACCEPT) &&
1235 (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1236 (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1240 s->s3->in_read_app_data=2;
1245 al=SSL_AD_UNEXPECTED_MESSAGE;
1246 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1253 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1259 dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len)
1263 if (SSL_in_init(s) && !s->in_handshake)
1265 i=s->handshake_func(s);
1266 if (i < 0) return(i);
1269 SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1274 if (len > SSL3_RT_MAX_PLAIN_LENGTH)
1276 SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_DTLS_MESSAGE_TOO_BIG);
1280 i = dtls1_write_bytes(s, type, buf_, len);
1285 /* this only happens when a client hello is received and a handshake
1288 have_handshake_fragment(SSL *s, int type, unsigned char *buf,
1292 if ((type == SSL3_RT_HANDSHAKE) && (s->d1->handshake_fragment_len > 0))
1293 /* (partially) satisfy request from storage */
1295 unsigned char *src = s->d1->handshake_fragment;
1296 unsigned char *dst = buf;
1301 while ((len > 0) && (s->d1->handshake_fragment_len > 0))
1304 len--; s->d1->handshake_fragment_len--;
1307 /* move any remaining fragment bytes: */
1308 for (k = 0; k < s->d1->handshake_fragment_len; k++)
1309 s->d1->handshake_fragment[k] = *src++;
1319 /* Call this to write data in records of type 'type'
1320 * It will return <= 0 if not all data has been sent or non-blocking IO.
1322 int dtls1_write_bytes(SSL *s, int type, const void *buf, int len)
1326 OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH);
1327 s->rwstate=SSL_NOTHING;
1328 i=do_dtls1_write(s, type, buf, len, 0);
1332 int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len, int create_empty_fragment)
1334 unsigned char *p,*pseq;
1335 int i,mac_size,clear=0;
1342 /* first check if there is a SSL3_BUFFER still being written
1343 * out. This will happen with non blocking IO */
1344 if (s->s3->wbuf.left != 0)
1346 OPENSSL_assert(0); /* XDTLS: want to see if we ever get here */
1347 return(ssl3_write_pending(s,type,buf,len));
1350 /* If we have an alert to send, lets send it */
1351 if (s->s3->alert_dispatch)
1353 i=s->method->ssl_dispatch_alert(s);
1356 /* if it went, fall through and send more stuff */
1359 if (len == 0 && !create_empty_fragment)
1366 if ( (sess == NULL) ||
1367 (s->enc_write_ctx == NULL) ||
1368 (EVP_MD_CTX_md(s->write_hash) == NULL))
1375 mac_size=EVP_MD_CTX_size(s->write_hash);
1380 /* DTLS implements explicit IV, so no need for empty fragments */
1382 /* 'create_empty_fragment' is true only when this function calls itself */
1383 if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done
1384 && SSL_version(s) != DTLS1_VERSION && SSL_version(s) != DTLS1_BAD_VER)
1386 /* countermeasure against known-IV weakness in CBC ciphersuites
1387 * (see http://www.openssl.org/~bodo/tls-cbc.txt)
1390 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
1392 /* recursive function call with 'create_empty_fragment' set;
1393 * this prepares and buffers the data for an empty fragment
1394 * (these 'prefix_len' bytes are sent out later
1395 * together with the actual payload) */
1396 prefix_len = s->method->do_ssl_write(s, type, buf, 0, 1);
1397 if (prefix_len <= 0)
1400 if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE)
1402 /* insufficient space */
1403 SSLerr(SSL_F_DO_DTLS1_WRITE, ERR_R_INTERNAL_ERROR);
1408 s->s3->empty_fragment_done = 1;
1411 p = wb->buf + prefix_len;
1413 /* write the header */
1418 *(p++)=(s->version>>8);
1419 *(p++)=s->version&0xff;
1421 /* field where we are to write out packet epoch, seq num and len */
1425 /* lets setup the record stuff. */
1427 /* Make space for the explicit IV in case of CBC.
1428 * (this is a bit of a boundary violation, but what the heck).
1430 if ( s->enc_write_ctx &&
1431 (EVP_CIPHER_mode( s->enc_write_ctx->cipher ) & EVP_CIPH_CBC_MODE))
1432 bs = EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
1436 wr->data=p + bs; /* make room for IV in case of CBC */
1437 wr->length=(int)len;
1438 wr->input=(unsigned char *)buf;
1440 /* we now 'read' from wr->input, wr->length bytes into
1443 /* first we compress */
1444 if (s->compress != NULL)
1446 if (!ssl3_do_compress(s))
1448 SSLerr(SSL_F_DO_DTLS1_WRITE,SSL_R_COMPRESSION_FAILURE);
1454 memcpy(wr->data,wr->input,wr->length);
1458 /* we should still have the output to wr->data and the input
1459 * from wr->input. Length should be wr->length.
1460 * wr->data still points in the wb->buf */
1464 if(s->method->ssl3_enc->mac(s,&(p[wr->length + bs]),1) < 0)
1466 wr->length+=mac_size;
1469 /* this is true regardless of mac size */
1474 /* ssl3_enc can only have an error on read */
1475 if (bs) /* bs != 0 in case of CBC */
1477 RAND_pseudo_bytes(p,bs);
1478 /* master IV and last CBC residue stand for
1479 * the rest of randomness */
1483 s->method->ssl3_enc->enc(s,1);
1485 /* record length after mac and block padding */
1486 /* if (type == SSL3_RT_APPLICATION_DATA ||
1487 (type == SSL3_RT_ALERT && ! SSL_in_init(s))) */
1489 /* there's only one epoch between handshake and app data */
1491 s2n(s->d1->w_epoch, pseq);
1495 s2n(s->d1->handshake_epoch, pseq); */
1497 memcpy(pseq, &(s->s3->write_sequence[2]), 6);
1499 s2n(wr->length,pseq);
1501 /* we should now have
1502 * wr->data pointing to the encrypted data, which is
1503 * wr->length long */
1504 wr->type=type; /* not needed but helps for debugging */
1505 wr->length+=DTLS1_RT_HEADER_LENGTH;
1507 #if 0 /* this is now done at the message layer */
1508 /* buffer the record, making it easy to handle retransmits */
1509 if ( type == SSL3_RT_HANDSHAKE || type == SSL3_RT_CHANGE_CIPHER_SPEC)
1510 dtls1_buffer_record(s, wr->data, wr->length,
1511 *((PQ_64BIT *)&(s->s3->write_sequence[0])));
1514 ssl3_record_sequence_update(&(s->s3->write_sequence[0]));
1516 if (create_empty_fragment)
1518 /* we are in a recursive call;
1519 * just return the length, don't write out anything here
1524 /* now let's set up wb */
1525 wb->left = prefix_len + wr->length;
1528 /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
1529 s->s3->wpend_tot=len;
1530 s->s3->wpend_buf=buf;
1531 s->s3->wpend_type=type;
1532 s->s3->wpend_ret=len;
1534 /* we now just need to write the buffer */
1535 return ssl3_write_pending(s,type,buf,len);
1542 static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap)
1546 const unsigned char *seq = s->s3->read_sequence;
1548 cmp = satsub64be(seq,bitmap->max_seq_num);
1551 memcpy (s->s3->rrec.seq_num,seq,8);
1552 return 1; /* this record in new */
1555 if (shift >= sizeof(bitmap->map)*8)
1556 return 0; /* stale, outside the window */
1557 else if (bitmap->map & (1UL<<shift))
1558 return 0; /* record previously received */
1560 memcpy (s->s3->rrec.seq_num,seq,8);
1565 static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap)
1569 const unsigned char *seq = s->s3->read_sequence;
1571 cmp = satsub64be(seq,bitmap->max_seq_num);
1575 if (shift < sizeof(bitmap->map)*8)
1576 bitmap->map <<= shift, bitmap->map |= 1UL;
1579 memcpy(bitmap->max_seq_num,seq,8);
1583 if (shift < sizeof(bitmap->map)*8)
1584 bitmap->map |= 1UL<<shift;
1589 int dtls1_dispatch_alert(SSL *s)
1592 void (*cb)(const SSL *ssl,int type,int val)=NULL;
1593 unsigned char buf[DTLS1_AL_HEADER_LENGTH];
1594 unsigned char *ptr = &buf[0];
1596 s->s3->alert_dispatch=0;
1598 memset(buf, 0x00, sizeof(buf));
1599 *ptr++ = s->s3->send_alert[0];
1600 *ptr++ = s->s3->send_alert[1];
1602 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1603 if (s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
1605 s2n(s->d1->handshake_read_seq, ptr);
1607 if ( s->d1->r_msg_hdr.frag_off == 0) /* waiting for a new msg */
1610 s2n(s->d1->r_msg_hdr.seq, ptr); /* partial msg read */
1614 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);
1616 l2n3(s->d1->r_msg_hdr.frag_off, ptr);
1620 i = do_dtls1_write(s, SSL3_RT_ALERT, &buf[0], sizeof(buf), 0);
1623 s->s3->alert_dispatch=1;
1624 /* fprintf( stderr, "not done with alert\n" ); */
1628 if (s->s3->send_alert[0] == SSL3_AL_FATAL
1629 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1630 || s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1633 (void)BIO_flush(s->wbio);
1635 if (s->msg_callback)
1636 s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert,
1637 2, s, s->msg_callback_arg);
1639 if (s->info_callback != NULL)
1640 cb=s->info_callback;
1641 else if (s->ctx->info_callback != NULL)
1642 cb=s->ctx->info_callback;
1646 j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1647 cb(s,SSL_CB_WRITE_ALERT,j);
1654 static DTLS1_BITMAP *
1655 dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, unsigned int *is_next_epoch)
1660 /* In current epoch, accept HM, CCS, DATA, & ALERT */
1661 if (rr->epoch == s->d1->r_epoch)
1662 return &s->d1->bitmap;
1664 /* Only HM and ALERT messages can be from the next epoch */
1665 else if (rr->epoch == (unsigned long)(s->d1->r_epoch + 1) &&
1666 (rr->type == SSL3_RT_HANDSHAKE ||
1667 rr->type == SSL3_RT_ALERT))
1670 return &s->d1->next_bitmap;
1678 dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, unsigned short *priority,
1679 unsigned long *offset)
1682 /* alerts are passed up immediately */
1683 if ( rr->type == SSL3_RT_APPLICATION_DATA ||
1684 rr->type == SSL3_RT_ALERT)
1687 /* Only need to buffer if a handshake is underway.
1688 * (this implies that Hello Request and Client Hello are passed up
1690 if ( SSL_in_init(s))
1692 unsigned char *data = rr->data;
1693 /* need to extract the HM/CCS sequence number here */
1694 if ( rr->type == SSL3_RT_HANDSHAKE ||
1695 rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1697 unsigned short seq_num;
1698 struct hm_header_st msg_hdr;
1699 struct ccs_header_st ccs_hdr;
1701 if ( rr->type == SSL3_RT_HANDSHAKE)
1703 dtls1_get_message_header(data, &msg_hdr);
1704 seq_num = msg_hdr.seq;
1705 *offset = msg_hdr.frag_off;
1709 dtls1_get_ccs_header(data, &ccs_hdr);
1710 seq_num = ccs_hdr.seq;
1714 /* this is either a record we're waiting for, or a
1715 * retransmit of something we happened to previously
1716 * receive (higher layers will drop the repeat silently */
1717 if ( seq_num < s->d1->handshake_read_seq)
1719 if (rr->type == SSL3_RT_HANDSHAKE &&
1720 seq_num == s->d1->handshake_read_seq &&
1721 msg_hdr.frag_off < s->d1->r_msg_hdr.frag_off)
1723 else if ( seq_num == s->d1->handshake_read_seq &&
1724 (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC ||
1725 msg_hdr.frag_off == s->d1->r_msg_hdr.frag_off))
1729 *priority = seq_num;
1733 else /* unknown record type */
1742 dtls1_reset_seq_numbers(SSL *s, int rw)
1745 unsigned int seq_bytes = sizeof(s->s3->read_sequence);
1747 if ( rw & SSL3_CC_READ)
1749 seq = s->s3->read_sequence;
1751 memcpy(&(s->d1->bitmap), &(s->d1->next_bitmap), sizeof(DTLS1_BITMAP));
1752 memset(&(s->d1->next_bitmap), 0x00, sizeof(DTLS1_BITMAP));
1756 seq = s->s3->write_sequence;
1757 memcpy(s->d1->last_write_sequence, seq, sizeof(s->s3->write_sequence));
1761 memset(seq, 0x00, seq_bytes);
1766 dtls1_clear_timeouts(SSL *s)
1768 memset(&(s->d1->timeout), 0x00, sizeof(struct dtls1_timeout_st));