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);
183 /* copy buffered record into SSL structure */
185 dtls1_copy_record(SSL *s, pitem *item)
187 DTLS1_RECORD_DATA *rdata;
189 rdata = (DTLS1_RECORD_DATA *)item->data;
191 if (s->s3->rbuf.buf != NULL)
192 OPENSSL_free(s->s3->rbuf.buf);
194 s->packet = rdata->packet;
195 s->packet_length = rdata->packet_length;
196 memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
197 memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
199 /* Set proper sequence number for mac calculation */
200 memcpy(&(s->s3->read_sequence[2]), &(rdata->packet[5]), 6);
207 dtls1_buffer_record(SSL *s, record_pqueue *queue, unsigned char *priority)
209 DTLS1_RECORD_DATA *rdata;
212 /* Limit the size of the queue to prevent DOS attacks */
213 if (pqueue_size(queue->q) >= 100)
216 rdata = OPENSSL_malloc(sizeof(DTLS1_RECORD_DATA));
217 item = pitem_new(priority, rdata);
218 if (rdata == NULL || item == NULL)
220 if (rdata != NULL) OPENSSL_free(rdata);
221 if (item != NULL) pitem_free(item);
223 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
227 rdata->packet = s->packet;
228 rdata->packet_length = s->packet_length;
229 memcpy(&(rdata->rbuf), &(s->s3->rbuf), sizeof(SSL3_BUFFER));
230 memcpy(&(rdata->rrec), &(s->s3->rrec), sizeof(SSL3_RECORD));
235 s->packet_length = 0;
236 memset(&(s->s3->rbuf), 0, sizeof(SSL3_BUFFER));
237 memset(&(s->s3->rrec), 0, sizeof(SSL3_RECORD));
239 if (!ssl3_setup_buffers(s))
241 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
247 /* insert should not fail, since duplicates are dropped */
248 if (pqueue_insert(queue->q, item) == NULL)
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)
375 unsigned int mac_size, orig_len;
376 unsigned char md[EVP_MAX_MD_SIZE];
381 /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
382 * and we have that many bytes in s->packet
384 rr->input= &(s->packet[DTLS1_RT_HEADER_LENGTH]);
386 /* ok, we can now read from 's->packet' data into 'rr'
387 * rr->input points at rr->length bytes, which
388 * need to be copied into rr->data by either
389 * the decryption or by the decompression
390 * When the data is 'copied' into the rr->data buffer,
391 * rr->input will be pointed at the new buffer */
393 /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
394 * rr->length bytes of encrypted compressed stuff. */
396 /* check is not needed I believe */
397 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
399 al=SSL_AD_RECORD_OVERFLOW;
400 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
404 /* decrypt in place in 'rr->input' */
407 enc_err = s->method->ssl3_enc->enc(s,0);
409 * 0: (in non-constant time) if the record is publically invalid.
410 * 1: if the padding is valid
411 * -1: if the padding is invalid */
414 /* For DTLS we simply ignore bad packets. */
416 s->packet_length = 0;
421 printf("dec %d\n",rr->length);
422 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
426 /* r->length is now the compressed data plus mac */
427 if ((sess != NULL) &&
428 (s->enc_read_ctx != NULL) &&
429 (EVP_MD_CTX_md(s->read_hash) != NULL))
431 /* s->read_hash != NULL => mac_size != -1 */
432 unsigned char *mac = NULL;
433 unsigned char mac_tmp[EVP_MAX_MD_SIZE];
434 mac_size=EVP_MD_CTX_size(s->read_hash);
435 OPENSSL_assert(mac_size <= EVP_MAX_MD_SIZE);
437 /* kludge: *_cbc_remove_padding passes padding length in rr->type */
438 orig_len = rr->length+((unsigned int)rr->type>>8);
440 /* orig_len is the length of the record before any padding was
441 * removed. This is public information, as is the MAC in use,
442 * therefore we can safely process the record in a different
443 * amount of time if it's too short to possibly contain a MAC.
445 if (orig_len < mac_size ||
446 /* CBC records must have a padding length byte too. */
447 (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE &&
448 orig_len < mac_size+1))
450 al=SSL_AD_DECODE_ERROR;
451 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_LENGTH_TOO_SHORT);
455 if (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE)
457 /* We update the length so that the TLS header bytes
458 * can be constructed correctly but we need to extract
459 * the MAC in constant time from within the record,
460 * without leaking the contents of the padding bytes.
463 ssl3_cbc_copy_mac(mac_tmp, rr, mac_size, orig_len);
464 rr->length -= mac_size;
468 /* In this case there's no padding, so |orig_len|
469 * equals |rec->length| and we checked that there's
470 * enough bytes for |mac_size| above. */
471 rr->length -= mac_size;
472 mac = &rr->data[rr->length];
475 i=s->method->ssl3_enc->mac(s,md,0 /* not send */);
476 if (i < 0 || mac == NULL || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0)
478 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+mac_size)
484 /* decryption failed, silently discard message */
486 s->packet_length = 0;
490 /* r->length is now just compressed */
491 if (s->expand != NULL)
493 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH)
495 al=SSL_AD_RECORD_OVERFLOW;
496 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
499 if (!ssl3_do_uncompress(s))
501 al=SSL_AD_DECOMPRESSION_FAILURE;
502 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_BAD_DECOMPRESSION);
507 if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH)
509 al=SSL_AD_RECORD_OVERFLOW;
510 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
515 /* So at this point the following is true
516 * ssl->s3->rrec.type is the type of record
517 * ssl->s3->rrec.length == number of bytes in record
518 * ssl->s3->rrec.off == offset to first valid byte
519 * ssl->s3->rrec.data == where to take bytes from, increment
523 /* we have pulled in a full packet so zero things */
525 dtls1_record_bitmap_update(s, &(s->d1->bitmap));/* Mark receipt of record. */
529 ssl3_send_alert(s,SSL3_AL_FATAL,al);
535 /* Call this to get a new input record.
536 * It will return <= 0 if more data is needed, normally due to an error
537 * or non-blocking IO.
538 * When it finishes, one packet has been decoded and can be found in
539 * ssl->s3->rrec.type - is the type of record
540 * ssl->s3->rrec.data, - data
541 * ssl->s3->rrec.length, - number of bytes
543 /* used only by dtls1_read_bytes */
544 int dtls1_get_record(SSL *s)
546 int ssl_major,ssl_minor;
549 unsigned char *p = NULL;
550 unsigned short version;
551 DTLS1_BITMAP *bitmap;
552 unsigned int is_next_epoch;
556 /* The epoch may have changed. If so, process all the
557 * pending records. This is a non-blocking operation. */
558 dtls1_process_buffered_records(s);
560 /* if we're renegotiating, then there may be buffered records */
561 if (dtls1_get_processed_record(s))
564 /* get something from the wire */
566 /* check if we have the header */
567 if ( (s->rstate != SSL_ST_READ_BODY) ||
568 (s->packet_length < DTLS1_RT_HEADER_LENGTH))
570 n=ssl3_read_n(s, DTLS1_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
571 /* read timeout is handled by dtls1_read_bytes */
572 if (n <= 0) return(n); /* error or non-blocking */
574 /* this packet contained a partial record, dump it */
575 if (s->packet_length != DTLS1_RT_HEADER_LENGTH)
577 s->packet_length = 0;
581 s->rstate=SSL_ST_READ_BODY;
585 /* Pull apart the header into the DTLS1_RECORD */
589 version=(ssl_major<<8)|ssl_minor;
591 /* sequence number is 64 bits, with top 2 bytes = epoch */
594 memcpy(&(s->s3->read_sequence[2]), p, 6);
599 /* Lets check version */
600 if (!s->first_packet)
602 if (version != s->version)
604 /* unexpected version, silently discard */
606 s->packet_length = 0;
611 if ((version & 0xff00) != (s->version & 0xff00))
613 /* wrong version, silently discard record */
615 s->packet_length = 0;
619 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
621 /* record too long, silently discard it */
623 s->packet_length = 0;
627 /* now s->rstate == SSL_ST_READ_BODY */
630 /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
632 if (rr->length > s->packet_length-DTLS1_RT_HEADER_LENGTH)
634 /* now s->packet_length == DTLS1_RT_HEADER_LENGTH */
636 n=ssl3_read_n(s,i,i,1);
637 if (n <= 0) return(n); /* error or non-blocking io */
639 /* this packet contained a partial record, dump it */
643 s->packet_length = 0;
647 /* now n == rr->length,
648 * and s->packet_length == DTLS1_RT_HEADER_LENGTH + rr->length */
650 s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
652 /* match epochs. NULL means the packet is dropped on the floor */
653 bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch);
657 s->packet_length = 0; /* dump this record */
658 goto again; /* get another record */
661 /* Check whether this is a repeat, or aged record.
662 * Don't check if we're listening and this message is
663 * a ClientHello. They can look as if they're replayed,
664 * since they arrive from different connections and
665 * would be dropped unnecessarily.
667 if (!(s->d1->listen && rr->type == SSL3_RT_HANDSHAKE &&
668 *p == SSL3_MT_CLIENT_HELLO) &&
669 !dtls1_record_replay_check(s, bitmap))
672 s->packet_length=0; /* dump this record */
673 goto again; /* get another record */
676 /* just read a 0 length packet */
677 if (rr->length == 0) goto again;
679 /* If this record is from the next epoch (either HM or ALERT),
680 * and a handshake is currently in progress, buffer it since it
681 * cannot be processed at this time. However, do not buffer
682 * anything while listening.
686 if ((SSL_in_init(s) || s->in_handshake) && !s->d1->listen)
688 dtls1_buffer_record(s, &(s->d1->unprocessed_rcds), rr->seq_num);
691 s->packet_length = 0;
695 if (!dtls1_process_record(s))
698 s->packet_length = 0; /* dump this record */
699 goto again; /* get another record */
706 /* Return up to 'len' payload bytes received in 'type' records.
707 * 'type' is one of the following:
709 * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
710 * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
711 * - 0 (during a shutdown, no data has to be returned)
713 * If we don't have stored data to work from, read a SSL/TLS record first
714 * (possibly multiple records if we still don't have anything to return).
716 * This function must handle any surprises the peer may have for us, such as
717 * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
718 * a surprise, but handled as if it were), or renegotiation requests.
719 * Also if record payloads contain fragments too small to process, we store
720 * them until there is enough for the respective protocol (the record protocol
721 * may use arbitrary fragmentation and even interleaving):
722 * Change cipher spec protocol
723 * just 1 byte needed, no need for keeping anything stored
725 * 2 bytes needed (AlertLevel, AlertDescription)
727 * 4 bytes needed (HandshakeType, uint24 length) -- we just have
728 * to detect unexpected Client Hello and Hello Request messages
729 * here, anything else is handled by higher layers
730 * Application data protocol
731 * none of our business
733 int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
738 void (*cb)(const SSL *ssl,int type2,int val)=NULL;
740 if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
741 if (!ssl3_setup_buffers(s))
744 /* XXX: check what the second '&& type' is about */
745 if ((type && (type != SSL3_RT_APPLICATION_DATA) &&
746 (type != SSL3_RT_HANDSHAKE) && type) ||
747 (peek && (type != SSL3_RT_APPLICATION_DATA)))
749 SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
753 /* check whether there's a handshake message (client hello?) waiting */
754 if ( (ret = have_handshake_fragment(s, type, buf, len, peek)))
757 /* Now s->d1->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
759 if (!s->in_handshake && SSL_in_init(s))
761 /* type == SSL3_RT_APPLICATION_DATA */
762 i=s->handshake_func(s);
763 if (i < 0) return(i);
766 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
772 s->rwstate=SSL_NOTHING;
774 /* s->s3->rrec.type - is the type of record
775 * s->s3->rrec.data, - data
776 * s->s3->rrec.off, - offset into 'data' for next read
777 * s->s3->rrec.length, - number of bytes. */
780 /* We are not handshaking and have no data yet,
781 * so process data buffered during the last handshake
782 * in advance, if any.
784 if (s->state == SSL_ST_OK && rr->length == 0)
787 item = pqueue_pop(s->d1->buffered_app_data.q);
790 dtls1_copy_record(s, item);
792 OPENSSL_free(item->data);
797 /* Check for timeout */
798 if (dtls1_handle_timeout(s) > 0)
801 /* get new packet if necessary */
802 if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
804 ret=dtls1_get_record(s);
807 ret = dtls1_read_failed(s, ret);
808 /* anything other than a timeout is an error */
816 if (s->d1->listen && rr->type != SSL3_RT_HANDSHAKE)
822 /* we now have a packet which can be read and processed */
824 if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
825 * reset by ssl3_get_finished */
826 && (rr->type != SSL3_RT_HANDSHAKE))
828 /* We now have application data between CCS and Finished.
829 * Most likely the packets were reordered on their way, so
830 * buffer the application data for later processing rather
831 * than dropping the connection.
833 dtls1_buffer_record(s, &(s->d1->buffered_app_data), rr->seq_num);
838 /* If the other end has shut down, throw anything we read away
839 * (even in 'peek' mode) */
840 if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
843 s->rwstate=SSL_NOTHING;
848 if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
850 /* make sure that we are not getting application data when we
851 * are doing a handshake for the first time */
852 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
853 (s->enc_read_ctx == NULL))
855 al=SSL_AD_UNEXPECTED_MESSAGE;
856 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
860 if (len <= 0) return(len);
862 if ((unsigned int)len > rr->length)
865 n = (unsigned int)len;
867 memcpy(buf,&(rr->data[rr->off]),n);
874 s->rstate=SSL_ST_READ_HEADER;
882 /* If we get here, then type != rr->type; if we have a handshake
883 * message, then it was unexpected (Hello Request or Client Hello). */
885 /* In case of record types for which we have 'fragment' storage,
886 * fill that so that we can process the data at a fixed place.
889 unsigned int k, dest_maxlen = 0;
890 unsigned char *dest = NULL;
891 unsigned int *dest_len = NULL;
893 if (rr->type == SSL3_RT_HANDSHAKE)
895 dest_maxlen = sizeof s->d1->handshake_fragment;
896 dest = s->d1->handshake_fragment;
897 dest_len = &s->d1->handshake_fragment_len;
899 else if (rr->type == SSL3_RT_ALERT)
901 dest_maxlen = sizeof(s->d1->alert_fragment);
902 dest = s->d1->alert_fragment;
903 dest_len = &s->d1->alert_fragment_len;
905 /* else it's a CCS message, or application data or wrong */
906 else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC)
908 /* Application data while renegotiating
909 * is allowed. Try again reading.
911 if (rr->type == SSL3_RT_APPLICATION_DATA)
914 s->s3->in_read_app_data=2;
916 s->rwstate=SSL_READING;
917 BIO_clear_retry_flags(bio);
918 BIO_set_retry_read(bio);
922 /* Not certain if this is the right error handling */
923 al=SSL_AD_UNEXPECTED_MESSAGE;
924 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
930 /* XDTLS: In a pathalogical case, the Client Hello
931 * may be fragmented--don't always expect dest_maxlen bytes */
932 if ( rr->length < dest_maxlen)
934 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
936 * for normal alerts rr->length is 2, while
937 * dest_maxlen is 7 if we were to handle this
938 * non-existing alert...
942 s->rstate=SSL_ST_READ_HEADER;
947 /* now move 'n' bytes: */
948 for ( k = 0; k < dest_maxlen; k++)
950 dest[k] = rr->data[rr->off++];
953 *dest_len = dest_maxlen;
957 /* s->d1->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE;
958 * s->d1->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT.
959 * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
961 /* If we are a client, check for an incoming 'Hello Request': */
963 (s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
964 (s->d1->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
965 (s->session != NULL) && (s->session->cipher != NULL))
967 s->d1->handshake_fragment_len = 0;
969 if ((s->d1->handshake_fragment[1] != 0) ||
970 (s->d1->handshake_fragment[2] != 0) ||
971 (s->d1->handshake_fragment[3] != 0))
973 al=SSL_AD_DECODE_ERROR;
974 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
978 /* no need to check sequence number on HELLO REQUEST messages */
981 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
982 s->d1->handshake_fragment, 4, s, s->msg_callback_arg);
984 if (SSL_is_init_finished(s) &&
985 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
988 s->d1->handshake_read_seq++;
990 if (ssl3_renegotiate_check(s))
992 i=s->handshake_func(s);
993 if (i < 0) return(i);
996 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1000 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1002 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1005 /* In the case where we try to read application data,
1006 * but we trigger an SSL handshake, we return -1 with
1007 * the retry option set. Otherwise renegotiation may
1008 * cause nasty problems in the blocking world */
1009 s->rwstate=SSL_READING;
1010 bio=SSL_get_rbio(s);
1011 BIO_clear_retry_flags(bio);
1012 BIO_set_retry_read(bio);
1018 /* we either finished a handshake or ignored the request,
1019 * now try again to obtain the (application) data we were asked for */
1023 if (s->d1->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH)
1025 int alert_level = s->d1->alert_fragment[0];
1026 int alert_descr = s->d1->alert_fragment[1];
1028 s->d1->alert_fragment_len = 0;
1030 if (s->msg_callback)
1031 s->msg_callback(0, s->version, SSL3_RT_ALERT,
1032 s->d1->alert_fragment, 2, s, s->msg_callback_arg);
1034 if (s->info_callback != NULL)
1035 cb=s->info_callback;
1036 else if (s->ctx->info_callback != NULL)
1037 cb=s->ctx->info_callback;
1041 j = (alert_level << 8) | alert_descr;
1042 cb(s, SSL_CB_READ_ALERT, j);
1045 if (alert_level == 1) /* warning */
1047 s->s3->warn_alert = alert_descr;
1048 if (alert_descr == SSL_AD_CLOSE_NOTIFY)
1050 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
1054 /* XXX: this is a possible improvement in the future */
1055 /* now check if it's a missing record */
1056 if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
1059 unsigned int frag_off;
1060 unsigned char *p = &(s->d1->alert_fragment[2]);
1065 dtls1_retransmit_message(s,
1066 dtls1_get_queue_priority(frag->msg_header.seq, 0),
1068 if ( ! found && SSL_in_init(s))
1070 /* fprintf( stderr,"in init = %d\n", SSL_in_init(s)); */
1071 /* requested a message not yet sent,
1072 send an alert ourselves */
1073 ssl3_send_alert(s,SSL3_AL_WARNING,
1074 DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
1079 else if (alert_level == 2) /* fatal */
1083 s->rwstate=SSL_NOTHING;
1084 s->s3->fatal_alert = alert_descr;
1085 SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1086 BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1087 ERR_add_error_data(2,"SSL alert number ",tmp);
1088 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1089 SSL_CTX_remove_session(s->ctx,s->session);
1094 al=SSL_AD_ILLEGAL_PARAMETER;
1095 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1102 if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1104 s->rwstate=SSL_NOTHING;
1109 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1111 struct ccs_header_st ccs_hdr;
1112 unsigned int ccs_hdr_len = DTLS1_CCS_HEADER_LENGTH;
1114 dtls1_get_ccs_header(rr->data, &ccs_hdr);
1116 if (s->version == DTLS1_BAD_VER)
1119 /* 'Change Cipher Spec' is just a single byte, so we know
1120 * exactly what the record payload has to look like */
1121 /* XDTLS: check that epoch is consistent */
1122 if ( (rr->length != ccs_hdr_len) ||
1123 (rr->off != 0) || (rr->data[0] != SSL3_MT_CCS))
1125 i=SSL_AD_ILLEGAL_PARAMETER;
1126 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1132 if (s->msg_callback)
1133 s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,
1134 rr->data, 1, s, s->msg_callback_arg);
1136 /* We can't process a CCS now, because previous handshake
1137 * messages are still missing, so just drop it.
1139 if (!s->d1->change_cipher_spec_ok)
1144 s->d1->change_cipher_spec_ok = 0;
1146 s->s3->change_cipher_spec=1;
1147 if (!ssl3_do_change_cipher_spec(s))
1150 /* do this whenever CCS is processed */
1151 dtls1_reset_seq_numbers(s, SSL3_CC_READ);
1153 if (s->version == DTLS1_BAD_VER)
1154 s->d1->handshake_read_seq++;
1159 /* Unexpected handshake message (Client Hello, or protocol violation) */
1160 if ((s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
1163 struct hm_header_st msg_hdr;
1165 /* this may just be a stale retransmit */
1166 dtls1_get_message_header(rr->data, &msg_hdr);
1167 if( rr->epoch != s->d1->r_epoch)
1173 /* If we are server, we may have a repeated FINISHED of the
1174 * client here, then retransmit our CCS and FINISHED.
1176 if (msg_hdr.type == SSL3_MT_FINISHED)
1178 if (dtls1_check_timeout_num(s) < 0)
1181 dtls1_retransmit_buffered_messages(s);
1186 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1187 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1189 #if 0 /* worked only because C operator preferences are not as expected (and
1190 * because this is not really needed for clients except for detecting
1191 * protocol violations): */
1192 s->state=SSL_ST_BEFORE|(s->server)
1196 s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1200 i=s->handshake_func(s);
1201 if (i < 0) return(i);
1204 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1208 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1210 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1213 /* In the case where we try to read application data,
1214 * but we trigger an SSL handshake, we return -1 with
1215 * the retry option set. Otherwise renegotiation may
1216 * cause nasty problems in the blocking world */
1217 s->rwstate=SSL_READING;
1218 bio=SSL_get_rbio(s);
1219 BIO_clear_retry_flags(bio);
1220 BIO_set_retry_read(bio);
1230 #ifndef OPENSSL_NO_TLS
1231 /* TLS just ignores unknown message types */
1232 if (s->version == TLS1_VERSION)
1238 al=SSL_AD_UNEXPECTED_MESSAGE;
1239 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1241 case SSL3_RT_CHANGE_CIPHER_SPEC:
1243 case SSL3_RT_HANDSHAKE:
1244 /* we already handled all of these, with the possible exception
1245 * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1246 * should not happen when type != rr->type */
1247 al=SSL_AD_UNEXPECTED_MESSAGE;
1248 SSLerr(SSL_F_DTLS1_READ_BYTES,ERR_R_INTERNAL_ERROR);
1250 case SSL3_RT_APPLICATION_DATA:
1251 /* At this point, we were expecting handshake data,
1252 * but have application data. If the library was
1253 * running inside ssl3_read() (i.e. in_read_app_data
1254 * is set) and it makes sense to read application data
1255 * at this point (session renegotiation not yet started),
1256 * we will indulge it.
1258 if (s->s3->in_read_app_data &&
1259 (s->s3->total_renegotiations != 0) &&
1261 (s->state & SSL_ST_CONNECT) &&
1262 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1263 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1265 (s->state & SSL_ST_ACCEPT) &&
1266 (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1267 (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1271 s->s3->in_read_app_data=2;
1276 al=SSL_AD_UNEXPECTED_MESSAGE;
1277 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1284 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1290 dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len)
1294 if (SSL_in_init(s) && !s->in_handshake)
1296 i=s->handshake_func(s);
1297 if (i < 0) return(i);
1300 SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1305 if (len > SSL3_RT_MAX_PLAIN_LENGTH)
1307 SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_DTLS_MESSAGE_TOO_BIG);
1311 i = dtls1_write_bytes(s, type, buf_, len);
1316 /* this only happens when a client hello is received and a handshake
1319 have_handshake_fragment(SSL *s, int type, unsigned char *buf,
1323 if ((type == SSL3_RT_HANDSHAKE) && (s->d1->handshake_fragment_len > 0))
1324 /* (partially) satisfy request from storage */
1326 unsigned char *src = s->d1->handshake_fragment;
1327 unsigned char *dst = buf;
1332 while ((len > 0) && (s->d1->handshake_fragment_len > 0))
1335 len--; s->d1->handshake_fragment_len--;
1338 /* move any remaining fragment bytes: */
1339 for (k = 0; k < s->d1->handshake_fragment_len; k++)
1340 s->d1->handshake_fragment[k] = *src++;
1350 /* Call this to write data in records of type 'type'
1351 * It will return <= 0 if not all data has been sent or non-blocking IO.
1353 int dtls1_write_bytes(SSL *s, int type, const void *buf, int len)
1357 OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH);
1358 s->rwstate=SSL_NOTHING;
1359 i=do_dtls1_write(s, type, buf, len, 0);
1363 int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len, int create_empty_fragment)
1365 unsigned char *p,*pseq;
1366 int i,mac_size,clear=0;
1373 /* first check if there is a SSL3_BUFFER still being written
1374 * out. This will happen with non blocking IO */
1375 if (s->s3->wbuf.left != 0)
1377 OPENSSL_assert(0); /* XDTLS: want to see if we ever get here */
1378 return(ssl3_write_pending(s,type,buf,len));
1381 /* If we have an alert to send, lets send it */
1382 if (s->s3->alert_dispatch)
1384 i=s->method->ssl_dispatch_alert(s);
1387 /* if it went, fall through and send more stuff */
1390 if (len == 0 && !create_empty_fragment)
1397 if ( (sess == NULL) ||
1398 (s->enc_write_ctx == NULL) ||
1399 (EVP_MD_CTX_md(s->write_hash) == NULL))
1406 mac_size=EVP_MD_CTX_size(s->write_hash);
1411 /* DTLS implements explicit IV, so no need for empty fragments */
1413 /* 'create_empty_fragment' is true only when this function calls itself */
1414 if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done
1415 && SSL_version(s) != DTLS1_VERSION && SSL_version(s) != DTLS1_BAD_VER)
1417 /* countermeasure against known-IV weakness in CBC ciphersuites
1418 * (see http://www.openssl.org/~bodo/tls-cbc.txt)
1421 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
1423 /* recursive function call with 'create_empty_fragment' set;
1424 * this prepares and buffers the data for an empty fragment
1425 * (these 'prefix_len' bytes are sent out later
1426 * together with the actual payload) */
1427 prefix_len = s->method->do_ssl_write(s, type, buf, 0, 1);
1428 if (prefix_len <= 0)
1431 if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE)
1433 /* insufficient space */
1434 SSLerr(SSL_F_DO_DTLS1_WRITE, ERR_R_INTERNAL_ERROR);
1439 s->s3->empty_fragment_done = 1;
1442 p = wb->buf + prefix_len;
1444 /* write the header */
1449 *(p++)=(s->version>>8);
1450 *(p++)=s->version&0xff;
1452 /* field where we are to write out packet epoch, seq num and len */
1456 /* lets setup the record stuff. */
1458 /* Make space for the explicit IV in case of CBC.
1459 * (this is a bit of a boundary violation, but what the heck).
1461 if ( s->enc_write_ctx &&
1462 (EVP_CIPHER_mode( s->enc_write_ctx->cipher ) & EVP_CIPH_CBC_MODE))
1463 bs = EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
1467 wr->data=p + bs; /* make room for IV in case of CBC */
1468 wr->length=(int)len;
1469 wr->input=(unsigned char *)buf;
1471 /* we now 'read' from wr->input, wr->length bytes into
1474 /* first we compress */
1475 if (s->compress != NULL)
1477 if (!ssl3_do_compress(s))
1479 SSLerr(SSL_F_DO_DTLS1_WRITE,SSL_R_COMPRESSION_FAILURE);
1485 memcpy(wr->data,wr->input,wr->length);
1489 /* we should still have the output to wr->data and the input
1490 * from wr->input. Length should be wr->length.
1491 * wr->data still points in the wb->buf */
1495 if(s->method->ssl3_enc->mac(s,&(p[wr->length + bs]),1) < 0)
1497 wr->length+=mac_size;
1500 /* this is true regardless of mac size */
1505 /* ssl3_enc can only have an error on read */
1506 if (bs) /* bs != 0 in case of CBC */
1508 RAND_pseudo_bytes(p,bs);
1509 /* master IV and last CBC residue stand for
1510 * the rest of randomness */
1514 if(s->method->ssl3_enc->enc(s,1) < 1) goto err;
1516 /* record length after mac and block padding */
1517 /* if (type == SSL3_RT_APPLICATION_DATA ||
1518 (type == SSL3_RT_ALERT && ! SSL_in_init(s))) */
1520 /* there's only one epoch between handshake and app data */
1522 s2n(s->d1->w_epoch, pseq);
1526 s2n(s->d1->handshake_epoch, pseq); */
1528 memcpy(pseq, &(s->s3->write_sequence[2]), 6);
1530 s2n(wr->length,pseq);
1532 /* we should now have
1533 * wr->data pointing to the encrypted data, which is
1534 * wr->length long */
1535 wr->type=type; /* not needed but helps for debugging */
1536 wr->length+=DTLS1_RT_HEADER_LENGTH;
1538 #if 0 /* this is now done at the message layer */
1539 /* buffer the record, making it easy to handle retransmits */
1540 if ( type == SSL3_RT_HANDSHAKE || type == SSL3_RT_CHANGE_CIPHER_SPEC)
1541 dtls1_buffer_record(s, wr->data, wr->length,
1542 *((PQ_64BIT *)&(s->s3->write_sequence[0])));
1545 ssl3_record_sequence_update(&(s->s3->write_sequence[0]));
1547 if (create_empty_fragment)
1549 /* we are in a recursive call;
1550 * just return the length, don't write out anything here
1555 /* now let's set up wb */
1556 wb->left = prefix_len + wr->length;
1559 /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
1560 s->s3->wpend_tot=len;
1561 s->s3->wpend_buf=buf;
1562 s->s3->wpend_type=type;
1563 s->s3->wpend_ret=len;
1565 /* we now just need to write the buffer */
1566 return ssl3_write_pending(s,type,buf,len);
1573 static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap)
1577 const unsigned char *seq = s->s3->read_sequence;
1579 cmp = satsub64be(seq,bitmap->max_seq_num);
1582 memcpy (s->s3->rrec.seq_num,seq,8);
1583 return 1; /* this record in new */
1586 if (shift >= sizeof(bitmap->map)*8)
1587 return 0; /* stale, outside the window */
1588 else if (bitmap->map & (1UL<<shift))
1589 return 0; /* record previously received */
1591 memcpy (s->s3->rrec.seq_num,seq,8);
1596 static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap)
1600 const unsigned char *seq = s->s3->read_sequence;
1602 cmp = satsub64be(seq,bitmap->max_seq_num);
1606 if (shift < sizeof(bitmap->map)*8)
1607 bitmap->map <<= shift, bitmap->map |= 1UL;
1610 memcpy(bitmap->max_seq_num,seq,8);
1614 if (shift < sizeof(bitmap->map)*8)
1615 bitmap->map |= 1UL<<shift;
1620 int dtls1_dispatch_alert(SSL *s)
1623 void (*cb)(const SSL *ssl,int type,int val)=NULL;
1624 unsigned char buf[DTLS1_AL_HEADER_LENGTH];
1625 unsigned char *ptr = &buf[0];
1627 s->s3->alert_dispatch=0;
1629 memset(buf, 0x00, sizeof(buf));
1630 *ptr++ = s->s3->send_alert[0];
1631 *ptr++ = s->s3->send_alert[1];
1633 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1634 if (s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
1636 s2n(s->d1->handshake_read_seq, ptr);
1638 if ( s->d1->r_msg_hdr.frag_off == 0) /* waiting for a new msg */
1641 s2n(s->d1->r_msg_hdr.seq, ptr); /* partial msg read */
1645 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);
1647 l2n3(s->d1->r_msg_hdr.frag_off, ptr);
1651 i = do_dtls1_write(s, SSL3_RT_ALERT, &buf[0], sizeof(buf), 0);
1654 s->s3->alert_dispatch=1;
1655 /* fprintf( stderr, "not done with alert\n" ); */
1659 if (s->s3->send_alert[0] == SSL3_AL_FATAL
1660 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1661 || s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1664 (void)BIO_flush(s->wbio);
1666 if (s->msg_callback)
1667 s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert,
1668 2, s, s->msg_callback_arg);
1670 if (s->info_callback != NULL)
1671 cb=s->info_callback;
1672 else if (s->ctx->info_callback != NULL)
1673 cb=s->ctx->info_callback;
1677 j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1678 cb(s,SSL_CB_WRITE_ALERT,j);
1685 static DTLS1_BITMAP *
1686 dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, unsigned int *is_next_epoch)
1691 /* In current epoch, accept HM, CCS, DATA, & ALERT */
1692 if (rr->epoch == s->d1->r_epoch)
1693 return &s->d1->bitmap;
1695 /* Only HM and ALERT messages can be from the next epoch */
1696 else if (rr->epoch == (unsigned long)(s->d1->r_epoch + 1) &&
1697 (rr->type == SSL3_RT_HANDSHAKE ||
1698 rr->type == SSL3_RT_ALERT))
1701 return &s->d1->next_bitmap;
1709 dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, unsigned short *priority,
1710 unsigned long *offset)
1713 /* alerts are passed up immediately */
1714 if ( rr->type == SSL3_RT_APPLICATION_DATA ||
1715 rr->type == SSL3_RT_ALERT)
1718 /* Only need to buffer if a handshake is underway.
1719 * (this implies that Hello Request and Client Hello are passed up
1721 if ( SSL_in_init(s))
1723 unsigned char *data = rr->data;
1724 /* need to extract the HM/CCS sequence number here */
1725 if ( rr->type == SSL3_RT_HANDSHAKE ||
1726 rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1728 unsigned short seq_num;
1729 struct hm_header_st msg_hdr;
1730 struct ccs_header_st ccs_hdr;
1732 if ( rr->type == SSL3_RT_HANDSHAKE)
1734 dtls1_get_message_header(data, &msg_hdr);
1735 seq_num = msg_hdr.seq;
1736 *offset = msg_hdr.frag_off;
1740 dtls1_get_ccs_header(data, &ccs_hdr);
1741 seq_num = ccs_hdr.seq;
1745 /* this is either a record we're waiting for, or a
1746 * retransmit of something we happened to previously
1747 * receive (higher layers will drop the repeat silently */
1748 if ( seq_num < s->d1->handshake_read_seq)
1750 if (rr->type == SSL3_RT_HANDSHAKE &&
1751 seq_num == s->d1->handshake_read_seq &&
1752 msg_hdr.frag_off < s->d1->r_msg_hdr.frag_off)
1754 else if ( seq_num == s->d1->handshake_read_seq &&
1755 (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC ||
1756 msg_hdr.frag_off == s->d1->r_msg_hdr.frag_off))
1760 *priority = seq_num;
1764 else /* unknown record type */
1773 dtls1_reset_seq_numbers(SSL *s, int rw)
1776 unsigned int seq_bytes = sizeof(s->s3->read_sequence);
1778 if ( rw & SSL3_CC_READ)
1780 seq = s->s3->read_sequence;
1782 memcpy(&(s->d1->bitmap), &(s->d1->next_bitmap), sizeof(DTLS1_BITMAP));
1783 memset(&(s->d1->next_bitmap), 0x00, sizeof(DTLS1_BITMAP));
1787 seq = s->s3->write_sequence;
1788 memcpy(s->d1->last_write_sequence, seq, sizeof(s->s3->write_sequence));
1792 memset(seq, 0x00, seq_bytes);