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>
124 static int have_handshake_fragment(SSL *s, int type, unsigned char *buf,
126 static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap,
128 static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap);
129 static DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr,
130 unsigned int *is_next_epoch);
132 static int dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr,
133 unsigned short *priority, unsigned long *offset);
135 static int dtls1_buffer_record(SSL *s, record_pqueue *q,
137 static int dtls1_process_record(SSL *s);
138 #if PQ_64BIT_IS_INTEGER
139 static PQ_64BIT bytes_to_long_long(unsigned char *bytes, PQ_64BIT *num);
141 static void dtls1_clear_timeouts(SSL *s);
143 /* copy buffered record into SSL structure */
145 dtls1_copy_record(SSL *s, pitem *item)
147 DTLS1_RECORD_DATA *rdata;
149 rdata = (DTLS1_RECORD_DATA *)item->data;
151 if (s->s3->rbuf.buf != NULL)
152 OPENSSL_free(s->s3->rbuf.buf);
154 s->packet = rdata->packet;
155 s->packet_length = rdata->packet_length;
156 memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
157 memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
164 dtls1_buffer_record(SSL *s, record_pqueue *queue, PQ_64BIT priority)
166 DTLS1_RECORD_DATA *rdata;
169 rdata = OPENSSL_malloc(sizeof(DTLS1_RECORD_DATA));
170 item = pitem_new(priority, rdata);
171 if (rdata == NULL || item == NULL)
173 if (rdata != NULL) OPENSSL_free(rdata);
174 if (item != NULL) pitem_free(item);
176 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
180 rdata->packet = s->packet;
181 rdata->packet_length = s->packet_length;
182 memcpy(&(rdata->rbuf), &(s->s3->rbuf), sizeof(SSL3_BUFFER));
183 memcpy(&(rdata->rrec), &(s->s3->rrec), sizeof(SSL3_RECORD));
187 /* insert should not fail, since duplicates are dropped */
188 if (pqueue_insert(queue->q, item) == NULL)
196 s->packet_length = 0;
197 memset(&(s->s3->rbuf), 0, sizeof(SSL3_BUFFER));
198 memset(&(s->s3->rrec), 0, sizeof(SSL3_RECORD));
200 if (!ssl3_setup_buffers(s))
202 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
213 dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue)
217 item = pqueue_pop(queue->q);
220 dtls1_copy_record(s, item);
222 OPENSSL_free(item->data);
232 /* retrieve a buffered record that belongs to the new epoch, i.e., not processed
234 #define dtls1_get_unprocessed_record(s) \
235 dtls1_retrieve_buffered_record((s), \
236 &((s)->d1->unprocessed_rcds))
238 /* retrieve a buffered record that belongs to the current epoch, ie, processed */
239 #define dtls1_get_processed_record(s) \
240 dtls1_retrieve_buffered_record((s), \
241 &((s)->d1->processed_rcds))
244 dtls1_process_buffered_records(SSL *s)
248 item = pqueue_peek(s->d1->unprocessed_rcds.q);
251 DTLS1_RECORD_DATA *rdata;
252 rdata = (DTLS1_RECORD_DATA *)item->data;
254 /* Check if epoch is current. */
255 if (s->d1->unprocessed_rcds.epoch != s->d1->r_epoch)
256 return(1); /* Nothing to do. */
258 /* Process all the records. */
259 while (pqueue_peek(s->d1->unprocessed_rcds.q))
261 dtls1_get_unprocessed_record(s);
262 if ( ! dtls1_process_record(s))
264 dtls1_buffer_record(s, &(s->d1->processed_rcds),
265 s->s3->rrec.seq_num);
269 /* sync epoch numbers once all the unprocessed records
270 * have been processed */
271 s->d1->processed_rcds.epoch = s->d1->r_epoch;
272 s->d1->unprocessed_rcds.epoch = s->d1->r_epoch + 1;
281 dtls1_get_buffered_record(SSL *s)
285 (((PQ_64BIT)s->d1->handshake_read_seq) << 32) |
286 ((PQ_64BIT)s->d1->r_msg_hdr.frag_off);
288 if ( ! SSL_in_init(s)) /* if we're not (re)negotiating,
293 item = pqueue_peek(s->d1->rcvd_records);
294 if (item && item->priority == priority)
296 /* Check if we've received the record of interest. It must be
297 * a handshake record, since data records as passed up without
299 DTLS1_RECORD_DATA *rdata;
300 item = pqueue_pop(s->d1->rcvd_records);
301 rdata = (DTLS1_RECORD_DATA *)item->data;
303 if (s->s3->rbuf.buf != NULL)
304 OPENSSL_free(s->s3->rbuf.buf);
306 s->packet = rdata->packet;
307 s->packet_length = rdata->packet_length;
308 memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
309 memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
311 OPENSSL_free(item->data);
314 /* s->d1->next_expected_seq_num++; */
324 dtls1_process_record(SSL *s)
331 unsigned int mac_size;
332 unsigned char md[EVP_MAX_MD_SIZE];
338 /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
339 * and we have that many bytes in s->packet
341 rr->input= &(s->packet[DTLS1_RT_HEADER_LENGTH]);
343 /* ok, we can now read from 's->packet' data into 'rr'
344 * rr->input points at rr->length bytes, which
345 * need to be copied into rr->data by either
346 * the decryption or by the decompression
347 * When the data is 'copied' into the rr->data buffer,
348 * rr->input will be pointed at the new buffer */
350 /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
351 * rr->length bytes of encrypted compressed stuff. */
353 /* check is not needed I believe */
354 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
356 al=SSL_AD_RECORD_OVERFLOW;
357 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
361 /* decrypt in place in 'rr->input' */
364 enc_err = s->method->ssl3_enc->enc(s,0);
368 /* SSLerr() and ssl3_send_alert() have been called */
371 /* otherwise enc_err == -1 */
372 goto decryption_failed_or_bad_record_mac;
376 printf("dec %d\n",rr->length);
377 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
381 /* r->length is now the compressed data plus mac */
382 if ( (sess == NULL) ||
383 (s->enc_read_ctx == NULL) ||
384 (s->read_hash == NULL))
389 mac_size=EVP_MD_size(s->read_hash);
391 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+mac_size)
393 #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
394 al=SSL_AD_RECORD_OVERFLOW;
395 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
398 goto decryption_failed_or_bad_record_mac;
401 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
402 if (rr->length < mac_size)
404 #if 0 /* OK only for stream ciphers */
405 al=SSL_AD_DECODE_ERROR;
406 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_LENGTH_TOO_SHORT);
409 goto decryption_failed_or_bad_record_mac;
412 rr->length-=mac_size;
413 i=s->method->ssl3_enc->mac(s,md,0);
414 if (memcmp(md,&(rr->data[rr->length]),mac_size) != 0)
416 goto decryption_failed_or_bad_record_mac;
420 /* r->length is now just compressed */
421 if (s->expand != NULL)
423 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH)
425 al=SSL_AD_RECORD_OVERFLOW;
426 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
429 if (!ssl3_do_uncompress(s))
431 al=SSL_AD_DECOMPRESSION_FAILURE;
432 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_BAD_DECOMPRESSION);
437 if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH)
439 al=SSL_AD_RECORD_OVERFLOW;
440 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
445 /* So at this point the following is true
446 * ssl->s3->rrec.type is the type of record
447 * ssl->s3->rrec.length == number of bytes in record
448 * ssl->s3->rrec.off == offset to first valid byte
449 * ssl->s3->rrec.data == where to take bytes from, increment
453 /* we have pulled in a full packet so zero things */
455 dtls1_record_bitmap_update(s, &(s->d1->bitmap));/* Mark receipt of record. */
458 decryption_failed_or_bad_record_mac:
459 /* Separate 'decryption_failed' alert was introduced with TLS 1.0,
460 * SSL 3.0 only has 'bad_record_mac'. But unless a decryption
461 * failure is directly visible from the ciphertext anyway,
462 * we should not reveal which kind of error occured -- this
463 * might become visible to an attacker (e.g. via logfile) */
464 al=SSL_AD_BAD_RECORD_MAC;
465 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
467 ssl3_send_alert(s,SSL3_AL_FATAL,al);
473 /* Call this to get a new input record.
474 * It will return <= 0 if more data is needed, normally due to an error
475 * or non-blocking IO.
476 * When it finishes, one packet has been decoded and can be found in
477 * ssl->s3->rrec.type - is the type of record
478 * ssl->s3->rrec.data, - data
479 * ssl->s3->rrec.length, - number of bytes
481 /* used only by dtls1_read_bytes */
482 int dtls1_get_record(SSL *s)
484 int ssl_major,ssl_minor,al;
489 unsigned short version;
490 DTLS1_BITMAP *bitmap;
491 unsigned int is_next_epoch;
496 /* The epoch may have changed. If so, process all the
497 * pending records. This is a non-blocking operation. */
498 if ( ! dtls1_process_buffered_records(s))
501 /* if we're renegotiating, then there may be buffered records */
502 if (dtls1_get_processed_record(s))
505 /* get something from the wire */
507 /* check if we have the header */
508 if ( (s->rstate != SSL_ST_READ_BODY) ||
509 (s->packet_length < DTLS1_RT_HEADER_LENGTH))
511 n=ssl3_read_n(s, DTLS1_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
512 /* read timeout is handled by dtls1_read_bytes */
513 if (n <= 0) return(n); /* error or non-blocking */
515 OPENSSL_assert(s->packet_length == DTLS1_RT_HEADER_LENGTH);
517 s->rstate=SSL_ST_READ_BODY;
521 /* Pull apart the header into the DTLS1_RECORD */
525 version=(ssl_major<<8)|ssl_minor;
527 /* sequence number is 64 bits, with top 2 bytes = epoch */
530 memcpy(&(s->s3->read_sequence[2]), p, 6);
535 /* Lets check version */
536 if (!s->first_packet)
538 if (version != s->version && version != DTLS1_BAD_VER)
540 SSLerr(SSL_F_DTLS1_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
541 /* Send back error using their
542 * version number :-) */
544 al=SSL_AD_PROTOCOL_VERSION;
549 if ((version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
550 (version & 0xff00) != (DTLS1_BAD_VER & 0xff00))
552 SSLerr(SSL_F_DTLS1_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
556 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
558 al=SSL_AD_RECORD_OVERFLOW;
559 SSLerr(SSL_F_DTLS1_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
563 /* now s->rstate == SSL_ST_READ_BODY */
566 /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
568 if (rr->length > s->packet_length-DTLS1_RT_HEADER_LENGTH)
570 /* now s->packet_length == DTLS1_RT_HEADER_LENGTH */
572 n=ssl3_read_n(s,i,i,1);
573 if (n <= 0) return(n); /* error or non-blocking io */
575 /* this packet contained a partial record, dump it */
578 s->packet_length = 0;
582 /* now n == rr->length,
583 * and s->packet_length == DTLS1_RT_HEADER_LENGTH + rr->length */
585 s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
587 /* match epochs. NULL means the packet is dropped on the floor */
588 bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch);
591 s->packet_length = 0; /* dump this record */
592 goto again; /* get another record */
595 /* check whether this is a repeat, or aged record */
596 if ( ! dtls1_record_replay_check(s, bitmap, &(rr->seq_num)))
598 s->packet_length=0; /* dump this record */
599 goto again; /* get another record */
602 /* just read a 0 length packet */
603 if (rr->length == 0) goto again;
605 /* If this record is from the next epoch (either HM or ALERT), buffer it
606 * since it cannot be processed at this time.
607 * Records from the next epoch are marked as received even though they are
608 * not processed, so as to prevent any potential resource DoS attack */
611 dtls1_record_bitmap_update(s, bitmap);
612 dtls1_buffer_record(s, &(s->d1->unprocessed_rcds), rr->seq_num);
613 s->packet_length = 0;
617 if ( ! dtls1_process_record(s))
620 dtls1_clear_timeouts(s); /* done waiting */
624 ssl3_send_alert(s,SSL3_AL_FATAL,al);
629 /* Return up to 'len' payload bytes received in 'type' records.
630 * 'type' is one of the following:
632 * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
633 * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
634 * - 0 (during a shutdown, no data has to be returned)
636 * If we don't have stored data to work from, read a SSL/TLS record first
637 * (possibly multiple records if we still don't have anything to return).
639 * This function must handle any surprises the peer may have for us, such as
640 * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
641 * a surprise, but handled as if it were), or renegotiation requests.
642 * Also if record payloads contain fragments too small to process, we store
643 * them until there is enough for the respective protocol (the record protocol
644 * may use arbitrary fragmentation and even interleaving):
645 * Change cipher spec protocol
646 * just 1 byte needed, no need for keeping anything stored
648 * 2 bytes needed (AlertLevel, AlertDescription)
650 * 4 bytes needed (HandshakeType, uint24 length) -- we just have
651 * to detect unexpected Client Hello and Hello Request messages
652 * here, anything else is handled by higher layers
653 * Application data protocol
654 * none of our business
656 int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
661 void (*cb)(const SSL *ssl,int type2,int val)=NULL;
663 if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
664 if (!ssl3_setup_buffers(s))
667 /* XXX: check what the second '&& type' is about */
668 if ((type && (type != SSL3_RT_APPLICATION_DATA) &&
669 (type != SSL3_RT_HANDSHAKE) && type) ||
670 (peek && (type != SSL3_RT_APPLICATION_DATA)))
672 SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
676 /* check whether there's a handshake message (client hello?) waiting */
677 if ( (ret = have_handshake_fragment(s, type, buf, len, peek)))
680 /* Now s->d1->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
682 if (!s->in_handshake && SSL_in_init(s))
684 /* type == SSL3_RT_APPLICATION_DATA */
685 i=s->handshake_func(s);
686 if (i < 0) return(i);
689 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
695 s->rwstate=SSL_NOTHING;
697 /* s->s3->rrec.type - is the type of record
698 * s->s3->rrec.data, - data
699 * s->s3->rrec.off, - offset into 'data' for next read
700 * s->s3->rrec.length, - number of bytes. */
703 /* get new packet if necessary */
704 if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
706 ret=dtls1_get_record(s);
709 ret = dtls1_read_failed(s, ret);
710 /* anything other than a timeout is an error */
718 /* we now have a packet which can be read and processed */
720 if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
721 * reset by ssl3_get_finished */
722 && (rr->type != SSL3_RT_HANDSHAKE))
724 al=SSL_AD_UNEXPECTED_MESSAGE;
725 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
729 /* If the other end has shut down, throw anything we read away
730 * (even in 'peek' mode) */
731 if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
734 s->rwstate=SSL_NOTHING;
739 if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
741 /* make sure that we are not getting application data when we
742 * are doing a handshake for the first time */
743 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
744 (s->enc_read_ctx == NULL))
746 al=SSL_AD_UNEXPECTED_MESSAGE;
747 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
751 if (len <= 0) return(len);
753 if ((unsigned int)len > rr->length)
756 n = (unsigned int)len;
758 memcpy(buf,&(rr->data[rr->off]),n);
765 s->rstate=SSL_ST_READ_HEADER;
773 /* If we get here, then type != rr->type; if we have a handshake
774 * message, then it was unexpected (Hello Request or Client Hello). */
776 /* In case of record types for which we have 'fragment' storage,
777 * fill that so that we can process the data at a fixed place.
780 unsigned int k, dest_maxlen = 0;
781 unsigned char *dest = NULL;
782 unsigned int *dest_len = NULL;
784 if (rr->type == SSL3_RT_HANDSHAKE)
786 dest_maxlen = sizeof s->d1->handshake_fragment;
787 dest = s->d1->handshake_fragment;
788 dest_len = &s->d1->handshake_fragment_len;
790 else if (rr->type == SSL3_RT_ALERT)
792 dest_maxlen = sizeof(s->d1->alert_fragment);
793 dest = s->d1->alert_fragment;
794 dest_len = &s->d1->alert_fragment_len;
796 /* else it's a CCS message, or it's wrong */
797 else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC)
799 /* Not certain if this is the right error handling */
800 al=SSL_AD_UNEXPECTED_MESSAGE;
801 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
808 /* XDTLS: In a pathalogical case, the Client Hello
809 * may be fragmented--don't always expect dest_maxlen bytes */
810 if ( rr->length < dest_maxlen)
812 s->rstate=SSL_ST_READ_HEADER;
817 /* now move 'n' bytes: */
818 for ( k = 0; k < dest_maxlen; k++)
820 dest[k] = rr->data[rr->off++];
823 *dest_len = dest_maxlen;
827 /* s->d1->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE;
828 * s->d1->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT.
829 * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
831 /* If we are a client, check for an incoming 'Hello Request': */
833 (s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
834 (s->d1->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
835 (s->session != NULL) && (s->session->cipher != NULL))
837 s->d1->handshake_fragment_len = 0;
839 if ((s->d1->handshake_fragment[1] != 0) ||
840 (s->d1->handshake_fragment[2] != 0) ||
841 (s->d1->handshake_fragment[3] != 0))
843 al=SSL_AD_DECODE_ERROR;
844 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
848 /* no need to check sequence number on HELLO REQUEST messages */
851 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
852 s->d1->handshake_fragment, 4, s, s->msg_callback_arg);
854 if (SSL_is_init_finished(s) &&
855 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
859 if (ssl3_renegotiate_check(s))
861 i=s->handshake_func(s);
862 if (i < 0) return(i);
865 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
869 if (!(s->mode & SSL_MODE_AUTO_RETRY))
871 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
874 /* In the case where we try to read application data,
875 * but we trigger an SSL handshake, we return -1 with
876 * the retry option set. Otherwise renegotiation may
877 * cause nasty problems in the blocking world */
878 s->rwstate=SSL_READING;
880 BIO_clear_retry_flags(bio);
881 BIO_set_retry_read(bio);
887 /* we either finished a handshake or ignored the request,
888 * now try again to obtain the (application) data we were asked for */
892 if (s->d1->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH)
894 int alert_level = s->d1->alert_fragment[0];
895 int alert_descr = s->d1->alert_fragment[1];
897 s->d1->alert_fragment_len = 0;
900 s->msg_callback(0, s->version, SSL3_RT_ALERT,
901 s->d1->alert_fragment, 2, s, s->msg_callback_arg);
903 if (s->info_callback != NULL)
905 else if (s->ctx->info_callback != NULL)
906 cb=s->ctx->info_callback;
910 j = (alert_level << 8) | alert_descr;
911 cb(s, SSL_CB_READ_ALERT, j);
914 if (alert_level == 1) /* warning */
916 s->s3->warn_alert = alert_descr;
917 if (alert_descr == SSL_AD_CLOSE_NOTIFY)
919 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
923 /* XXX: this is a possible improvement in the future */
924 /* now check if it's a missing record */
925 if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
928 unsigned int frag_off;
929 unsigned char *p = &(s->d1->alert_fragment[2]);
934 dtls1_retransmit_message(s, seq, frag_off, &found);
935 if ( ! found && SSL_in_init(s))
937 /* fprintf( stderr,"in init = %d\n", SSL_in_init(s)); */
938 /* requested a message not yet sent,
939 send an alert ourselves */
940 ssl3_send_alert(s,SSL3_AL_WARNING,
941 DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
946 else if (alert_level == 2) /* fatal */
950 s->rwstate=SSL_NOTHING;
951 s->s3->fatal_alert = alert_descr;
952 SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
953 BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
954 ERR_add_error_data(2,"SSL alert number ",tmp);
955 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
956 SSL_CTX_remove_session(s->ctx,s->session);
961 al=SSL_AD_ILLEGAL_PARAMETER;
962 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
969 if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
971 s->rwstate=SSL_NOTHING;
976 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
978 struct ccs_header_st ccs_hdr;
980 dtls1_get_ccs_header(rr->data, &ccs_hdr);
982 if ( ccs_hdr.seq == s->d1->handshake_read_seq)
984 /* 'Change Cipher Spec' is just a single byte, so we know
985 * exactly what the record payload has to look like */
986 /* XDTLS: check that epoch is consistent */
987 if ( (rr->length != DTLS1_CCS_HEADER_LENGTH) ||
988 (rr->off != 0) || (rr->data[0] != SSL3_MT_CCS))
990 i=SSL_AD_ILLEGAL_PARAMETER;
991 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
998 s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,
999 rr->data, 1, s, s->msg_callback_arg);
1001 s->s3->change_cipher_spec=1;
1002 if (!ssl3_do_change_cipher_spec(s))
1005 /* do this whenever CCS is processed */
1006 dtls1_reset_seq_numbers(s, SSL3_CC_READ);
1008 /* handshake read seq is reset upon handshake completion */
1009 s->d1->handshake_read_seq++;
1020 /* Unexpected handshake message (Client Hello, or protocol violation) */
1021 if ((s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
1024 struct hm_header_st msg_hdr;
1026 /* this may just be a stale retransmit */
1027 dtls1_get_message_header(rr->data, &msg_hdr);
1028 if( rr->epoch != s->d1->r_epoch)
1034 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1035 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1037 #if 0 /* worked only because C operator preferences are not as expected (and
1038 * because this is not really needed for clients except for detecting
1039 * protocol violations): */
1040 s->state=SSL_ST_BEFORE|(s->server)
1044 s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1048 i=s->handshake_func(s);
1049 if (i < 0) return(i);
1052 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1056 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1058 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1061 /* In the case where we try to read application data,
1062 * but we trigger an SSL handshake, we return -1 with
1063 * the retry option set. Otherwise renegotiation may
1064 * cause nasty problems in the blocking world */
1065 s->rwstate=SSL_READING;
1066 bio=SSL_get_rbio(s);
1067 BIO_clear_retry_flags(bio);
1068 BIO_set_retry_read(bio);
1078 #ifndef OPENSSL_NO_TLS
1079 /* TLS just ignores unknown message types */
1080 if (s->version == TLS1_VERSION)
1086 al=SSL_AD_UNEXPECTED_MESSAGE;
1087 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1089 case SSL3_RT_CHANGE_CIPHER_SPEC:
1091 case SSL3_RT_HANDSHAKE:
1092 /* we already handled all of these, with the possible exception
1093 * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1094 * should not happen when type != rr->type */
1095 al=SSL_AD_UNEXPECTED_MESSAGE;
1096 SSLerr(SSL_F_DTLS1_READ_BYTES,ERR_R_INTERNAL_ERROR);
1098 case SSL3_RT_APPLICATION_DATA:
1099 /* At this point, we were expecting handshake data,
1100 * but have application data. If the library was
1101 * running inside ssl3_read() (i.e. in_read_app_data
1102 * is set) and it makes sense to read application data
1103 * at this point (session renegotiation not yet started),
1104 * we will indulge it.
1106 if (s->s3->in_read_app_data &&
1107 (s->s3->total_renegotiations != 0) &&
1109 (s->state & SSL_ST_CONNECT) &&
1110 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1111 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1113 (s->state & SSL_ST_ACCEPT) &&
1114 (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1115 (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1119 s->s3->in_read_app_data=2;
1124 al=SSL_AD_UNEXPECTED_MESSAGE;
1125 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1132 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1138 dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len)
1143 if (SSL_in_init(s) && !s->in_handshake)
1145 i=s->handshake_func(s);
1146 if (i < 0) return(i);
1149 SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1159 /* dtls1_write_bytes sends one record at a time, sized according to
1160 * the currently known MTU */
1161 i = dtls1_write_bytes(s, type, buf_, len);
1162 if (i <= 0) return i;
1164 if ((i == (int)n) ||
1165 (type == SSL3_RT_APPLICATION_DATA &&
1166 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
1168 /* next chunk of data should get another prepended empty fragment
1169 * in ciphersuites with known-IV weakness: */
1170 s->s3->empty_fragment_done = 0;
1182 /* this only happens when a client hello is received and a handshake
1185 have_handshake_fragment(SSL *s, int type, unsigned char *buf,
1189 if ((type == SSL3_RT_HANDSHAKE) && (s->d1->handshake_fragment_len > 0))
1190 /* (partially) satisfy request from storage */
1192 unsigned char *src = s->d1->handshake_fragment;
1193 unsigned char *dst = buf;
1198 while ((len > 0) && (s->d1->handshake_fragment_len > 0))
1201 len--; s->d1->handshake_fragment_len--;
1204 /* move any remaining fragment bytes: */
1205 for (k = 0; k < s->d1->handshake_fragment_len; k++)
1206 s->d1->handshake_fragment[k] = *src++;
1216 /* Call this to write data in records of type 'type'
1217 * It will return <= 0 if not all data has been sent or non-blocking IO.
1219 int dtls1_write_bytes(SSL *s, int type, const void *buf_, int len)
1221 const unsigned char *buf=buf_;
1222 unsigned int tot,n,nw;
1226 s->rwstate=SSL_NOTHING;
1231 /* handshake layer figures out MTU for itself, but data records
1232 * are also sent through this interface, so need to figure out MTU */
1234 mtu = BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_GET_MTU, 0, NULL);
1235 mtu += DTLS1_HM_HEADER_LENGTH; /* HM already inserted */
1239 if (mtu > SSL3_RT_MAX_PLAIN_LENGTH)
1240 mtu = SSL3_RT_MAX_PLAIN_LENGTH;
1247 i=do_dtls1_write(s, type, &(buf[tot]), nw, 0);
1254 if ( (int)s->s3->wnum + i == len)
1262 int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len, int create_empty_fragment)
1264 unsigned char *p,*pseq;
1265 int i,mac_size,clear=0;
1272 /* first check if there is a SSL3_BUFFER still being written
1273 * out. This will happen with non blocking IO */
1274 if (s->s3->wbuf.left != 0)
1276 OPENSSL_assert(0); /* XDTLS: want to see if we ever get here */
1277 return(ssl3_write_pending(s,type,buf,len));
1280 /* If we have an alert to send, lets send it */
1281 if (s->s3->alert_dispatch)
1283 i=s->method->ssl_dispatch_alert(s);
1286 /* if it went, fall through and send more stuff */
1289 if (len == 0 && !create_empty_fragment)
1296 if ( (sess == NULL) ||
1297 (s->enc_write_ctx == NULL) ||
1298 (s->write_hash == NULL))
1304 mac_size=EVP_MD_size(s->write_hash);
1306 /* DTLS implements explicit IV, so no need for empty fragments */
1308 /* 'create_empty_fragment' is true only when this function calls itself */
1309 if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done
1310 && SSL_version(s) != DTLS1_VERSION)
1312 /* countermeasure against known-IV weakness in CBC ciphersuites
1313 * (see http://www.openssl.org/~bodo/tls-cbc.txt)
1316 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
1318 /* recursive function call with 'create_empty_fragment' set;
1319 * this prepares and buffers the data for an empty fragment
1320 * (these 'prefix_len' bytes are sent out later
1321 * together with the actual payload) */
1322 prefix_len = s->method->do_ssl_write(s, type, buf, 0, 1);
1323 if (prefix_len <= 0)
1326 if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE)
1328 /* insufficient space */
1329 SSLerr(SSL_F_DO_DTLS1_WRITE, ERR_R_INTERNAL_ERROR);
1334 s->s3->empty_fragment_done = 1;
1338 p = wb->buf + prefix_len;
1340 /* write the header */
1345 if (s->client_version == DTLS1_BAD_VER)
1346 *(p++) = DTLS1_BAD_VER>>8,
1347 *(p++) = DTLS1_BAD_VER&0xff;
1349 *(p++)=(s->version>>8),
1350 *(p++)=s->version&0xff;
1352 /* field where we are to write out packet epoch, seq num and len */
1356 /* lets setup the record stuff. */
1358 /* Make space for the explicit IV in case of CBC.
1359 * (this is a bit of a boundary violation, but what the heck).
1361 if ( s->enc_write_ctx &&
1362 (EVP_CIPHER_mode( s->enc_write_ctx->cipher ) & EVP_CIPH_CBC_MODE))
1363 bs = EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
1367 wr->data=p + bs; /* make room for IV in case of CBC */
1368 wr->length=(int)len;
1369 wr->input=(unsigned char *)buf;
1371 /* we now 'read' from wr->input, wr->length bytes into
1374 /* first we compress */
1375 if (s->compress != NULL)
1377 if (!ssl3_do_compress(s))
1379 SSLerr(SSL_F_DO_DTLS1_WRITE,SSL_R_COMPRESSION_FAILURE);
1385 memcpy(wr->data,wr->input,wr->length);
1389 /* we should still have the output to wr->data and the input
1390 * from wr->input. Length should be wr->length.
1391 * wr->data still points in the wb->buf */
1395 s->method->ssl3_enc->mac(s,&(p[wr->length + bs]),1);
1396 wr->length+=mac_size;
1399 /* this is true regardless of mac size */
1404 /* ssl3_enc can only have an error on read */
1405 wr->length += bs; /* bs != 0 in case of CBC. The enc fn provides
1407 s->method->ssl3_enc->enc(s,1);
1409 /* record length after mac and block padding */
1410 /* if (type == SSL3_RT_APPLICATION_DATA ||
1411 (type == SSL3_RT_ALERT && ! SSL_in_init(s))) */
1413 /* there's only one epoch between handshake and app data */
1415 s2n(s->d1->w_epoch, pseq);
1419 s2n(s->d1->handshake_epoch, pseq); */
1421 memcpy(pseq, &(s->s3->write_sequence[2]), 6);
1423 s2n(wr->length,pseq);
1425 /* we should now have
1426 * wr->data pointing to the encrypted data, which is
1427 * wr->length long */
1428 wr->type=type; /* not needed but helps for debugging */
1429 wr->length+=DTLS1_RT_HEADER_LENGTH;
1431 #if 0 /* this is now done at the message layer */
1432 /* buffer the record, making it easy to handle retransmits */
1433 if ( type == SSL3_RT_HANDSHAKE || type == SSL3_RT_CHANGE_CIPHER_SPEC)
1434 dtls1_buffer_record(s, wr->data, wr->length,
1435 *((PQ_64BIT *)&(s->s3->write_sequence[0])));
1438 ssl3_record_sequence_update(&(s->s3->write_sequence[0]));
1440 if (create_empty_fragment)
1442 /* we are in a recursive call;
1443 * just return the length, don't write out anything here
1448 /* now let's set up wb */
1449 wb->left = prefix_len + wr->length;
1452 /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
1453 s->s3->wpend_tot=len;
1454 s->s3->wpend_buf=buf;
1455 s->s3->wpend_type=type;
1456 s->s3->wpend_ret=len;
1458 /* we now just need to write the buffer */
1459 return ssl3_write_pending(s,type,buf,len);
1466 static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap,
1469 #if PQ_64BIT_IS_INTEGER
1470 PQ_64BIT mask = 0x0000000000000001L;
1472 PQ_64BIT rcd_num, tmp;
1474 pq_64bit_init(&rcd_num);
1475 pq_64bit_init(&tmp);
1477 /* this is the sequence number for the record just read */
1478 pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8);
1481 if (pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) ||
1482 pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num)))
1484 pq_64bit_assign(seq_num, &rcd_num);
1485 pq_64bit_free(&rcd_num);
1486 pq_64bit_free(&tmp);
1487 return 1; /* this record is new */
1490 pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
1492 if ( pq_64bit_get_word(&tmp) > bitmap->length)
1494 pq_64bit_free(&rcd_num);
1495 pq_64bit_free(&tmp);
1496 return 0; /* stale, outside the window */
1499 #if PQ_64BIT_IS_BIGNUM
1502 pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
1503 pq_64bit_sub_word(&tmp, 1);
1504 offset = pq_64bit_get_word(&tmp);
1505 if ( pq_64bit_is_bit_set(&(bitmap->map), offset))
1507 pq_64bit_free(&rcd_num);
1508 pq_64bit_free(&tmp);
1513 mask <<= (bitmap->max_seq_num - rcd_num - 1);
1514 if (bitmap->map & mask)
1515 return 0; /* record previously received */
1518 pq_64bit_assign(seq_num, &rcd_num);
1519 pq_64bit_free(&rcd_num);
1520 pq_64bit_free(&tmp);
1525 static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap)
1532 pq_64bit_init(&rcd_num);
1533 pq_64bit_init(&tmp);
1535 pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8);
1537 /* unfortunate code complexity due to 64-bit manipulation support
1538 * on 32-bit machines */
1539 if ( pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) ||
1540 pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num)))
1542 pq_64bit_sub(&tmp, &rcd_num, &(bitmap->max_seq_num));
1543 pq_64bit_add_word(&tmp, 1);
1545 shift = (unsigned int)pq_64bit_get_word(&tmp);
1547 pq_64bit_lshift(&(tmp), &(bitmap->map), shift);
1548 pq_64bit_assign(&(bitmap->map), &tmp);
1550 pq_64bit_set_bit(&(bitmap->map), 0);
1551 pq_64bit_add_word(&rcd_num, 1);
1552 pq_64bit_assign(&(bitmap->max_seq_num), &rcd_num);
1554 pq_64bit_assign_word(&tmp, 1);
1555 pq_64bit_lshift(&tmp, &tmp, bitmap->length);
1556 ctx = pq_64bit_ctx_new(&ctx);
1557 pq_64bit_mod(&(bitmap->map), &(bitmap->map), &tmp, ctx);
1558 pq_64bit_ctx_free(ctx);
1562 pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
1563 pq_64bit_sub_word(&tmp, 1);
1564 shift = (unsigned int)pq_64bit_get_word(&tmp);
1566 pq_64bit_set_bit(&(bitmap->map), shift);
1569 pq_64bit_free(&rcd_num);
1570 pq_64bit_free(&tmp);
1574 int dtls1_dispatch_alert(SSL *s)
1577 void (*cb)(const SSL *ssl,int type,int val)=NULL;
1578 unsigned char buf[2 + 2 + 3]; /* alert level + alert desc + message seq +frag_off */
1579 unsigned char *ptr = &buf[0];
1581 s->s3->alert_dispatch=0;
1583 memset(buf, 0x00, sizeof(buf));
1584 *ptr++ = s->s3->send_alert[0];
1585 *ptr++ = s->s3->send_alert[1];
1587 if (s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
1589 s2n(s->d1->handshake_read_seq, ptr);
1591 if ( s->d1->r_msg_hdr.frag_off == 0) /* waiting for a new msg */
1594 s2n(s->d1->r_msg_hdr.seq, ptr); /* partial msg read */
1598 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);
1600 l2n3(s->d1->r_msg_hdr.frag_off, ptr);
1603 i = do_dtls1_write(s, SSL3_RT_ALERT, &buf[0], sizeof(buf), 0);
1606 s->s3->alert_dispatch=1;
1607 /* fprintf( stderr, "not done with alert\n" ); */
1611 if ( s->s3->send_alert[0] == SSL3_AL_FATAL ||
1612 s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
1613 (void)BIO_flush(s->wbio);
1615 if (s->msg_callback)
1616 s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert,
1617 2, s, s->msg_callback_arg);
1619 if (s->info_callback != NULL)
1620 cb=s->info_callback;
1621 else if (s->ctx->info_callback != NULL)
1622 cb=s->ctx->info_callback;
1626 j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1627 cb(s,SSL_CB_WRITE_ALERT,j);
1634 static DTLS1_BITMAP *
1635 dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, unsigned int *is_next_epoch)
1640 /* In current epoch, accept HM, CCS, DATA, & ALERT */
1641 if (rr->epoch == s->d1->r_epoch)
1642 return &s->d1->bitmap;
1644 /* Only HM and ALERT messages can be from the next epoch */
1645 else if (rr->epoch == (unsigned long)(s->d1->r_epoch + 1) &&
1646 (rr->type == SSL3_RT_HANDSHAKE ||
1647 rr->type == SSL3_RT_ALERT))
1650 return &s->d1->next_bitmap;
1658 dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, unsigned short *priority,
1659 unsigned long *offset)
1662 /* alerts are passed up immediately */
1663 if ( rr->type == SSL3_RT_APPLICATION_DATA ||
1664 rr->type == SSL3_RT_ALERT)
1667 /* Only need to buffer if a handshake is underway.
1668 * (this implies that Hello Request and Client Hello are passed up
1670 if ( SSL_in_init(s))
1672 unsigned char *data = rr->data;
1673 /* need to extract the HM/CCS sequence number here */
1674 if ( rr->type == SSL3_RT_HANDSHAKE ||
1675 rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1677 unsigned short seq_num;
1678 struct hm_header_st msg_hdr;
1679 struct ccs_header_st ccs_hdr;
1681 if ( rr->type == SSL3_RT_HANDSHAKE)
1683 dtls1_get_message_header(data, &msg_hdr);
1684 seq_num = msg_hdr.seq;
1685 *offset = msg_hdr.frag_off;
1689 dtls1_get_ccs_header(data, &ccs_hdr);
1690 seq_num = ccs_hdr.seq;
1694 /* this is either a record we're waiting for, or a
1695 * retransmit of something we happened to previously
1696 * receive (higher layers will drop the repeat silently */
1697 if ( seq_num < s->d1->handshake_read_seq)
1699 if (rr->type == SSL3_RT_HANDSHAKE &&
1700 seq_num == s->d1->handshake_read_seq &&
1701 msg_hdr.frag_off < s->d1->r_msg_hdr.frag_off)
1703 else if ( seq_num == s->d1->handshake_read_seq &&
1704 (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC ||
1705 msg_hdr.frag_off == s->d1->r_msg_hdr.frag_off))
1709 *priority = seq_num;
1713 else /* unknown record type */
1722 dtls1_reset_seq_numbers(SSL *s, int rw)
1725 unsigned int seq_bytes = sizeof(s->s3->read_sequence);
1727 if ( rw & SSL3_CC_READ)
1729 seq = s->s3->read_sequence;
1732 pq_64bit_assign(&(s->d1->bitmap.map), &(s->d1->next_bitmap.map));
1733 s->d1->bitmap.length = s->d1->next_bitmap.length;
1734 pq_64bit_assign(&(s->d1->bitmap.max_seq_num),
1735 &(s->d1->next_bitmap.max_seq_num));
1737 pq_64bit_free(&(s->d1->next_bitmap.map));
1738 pq_64bit_free(&(s->d1->next_bitmap.max_seq_num));
1739 memset(&(s->d1->next_bitmap), 0x00, sizeof(DTLS1_BITMAP));
1740 pq_64bit_init(&(s->d1->next_bitmap.map));
1741 pq_64bit_init(&(s->d1->next_bitmap.max_seq_num));
1745 seq = s->s3->write_sequence;
1749 memset(seq, 0x00, seq_bytes);
1752 #if PQ_64BIT_IS_INTEGER
1754 bytes_to_long_long(unsigned char *bytes, PQ_64BIT *num)
1758 _num = (((PQ_64BIT)bytes[0]) << 56) |
1759 (((PQ_64BIT)bytes[1]) << 48) |
1760 (((PQ_64BIT)bytes[2]) << 40) |
1761 (((PQ_64BIT)bytes[3]) << 32) |
1762 (((PQ_64BIT)bytes[4]) << 24) |
1763 (((PQ_64BIT)bytes[5]) << 16) |
1764 (((PQ_64BIT)bytes[6]) << 8) |
1765 (((PQ_64BIT)bytes[7]) );
1774 dtls1_clear_timeouts(SSL *s)
1776 memset(&(s->d1->timeout), 0x00, sizeof(struct dtls1_timeout_st));