2 * Copyright 2005-2020 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
12 #include "../ssl_local.h"
13 #include <openssl/evp.h>
14 #include <openssl/buffer.h>
15 #include "record_local.h"
16 #include "internal/packet.h"
17 #include "internal/cryptlib.h"
19 int DTLS_RECORD_LAYER_new(RECORD_LAYER *rl)
23 if ((d = OPENSSL_malloc(sizeof(*d))) == NULL) {
24 SSLerr(SSL_F_DTLS_RECORD_LAYER_NEW, ERR_R_MALLOC_FAILURE);
30 d->unprocessed_rcds.q = pqueue_new();
31 d->processed_rcds.q = pqueue_new();
32 d->buffered_app_data.q = pqueue_new();
34 if (d->unprocessed_rcds.q == NULL || d->processed_rcds.q == NULL
35 || d->buffered_app_data.q == NULL) {
36 pqueue_free(d->unprocessed_rcds.q);
37 pqueue_free(d->processed_rcds.q);
38 pqueue_free(d->buffered_app_data.q);
47 void DTLS_RECORD_LAYER_free(RECORD_LAYER *rl)
49 DTLS_RECORD_LAYER_clear(rl);
50 pqueue_free(rl->d->unprocessed_rcds.q);
51 pqueue_free(rl->d->processed_rcds.q);
52 pqueue_free(rl->d->buffered_app_data.q);
57 void DTLS_RECORD_LAYER_clear(RECORD_LAYER *rl)
61 DTLS1_RECORD_DATA *rdata;
62 pqueue *unprocessed_rcds;
63 pqueue *processed_rcds;
64 pqueue *buffered_app_data;
68 while ((item = pqueue_pop(d->unprocessed_rcds.q)) != NULL) {
69 rdata = (DTLS1_RECORD_DATA *)item->data;
70 OPENSSL_free(rdata->rbuf.buf);
71 OPENSSL_free(item->data);
75 while ((item = pqueue_pop(d->processed_rcds.q)) != NULL) {
76 rdata = (DTLS1_RECORD_DATA *)item->data;
77 if (rl->s->options & SSL_OP_CLEANSE_PLAINTEXT)
78 OPENSSL_cleanse(rdata->rbuf.buf, rdata->rbuf.len);
79 OPENSSL_free(rdata->rbuf.buf);
80 OPENSSL_free(item->data);
84 while ((item = pqueue_pop(d->buffered_app_data.q)) != NULL) {
85 rdata = (DTLS1_RECORD_DATA *)item->data;
86 if (rl->s->options & SSL_OP_CLEANSE_PLAINTEXT)
87 OPENSSL_cleanse(rdata->rbuf.buf, rdata->rbuf.len);
88 OPENSSL_free(rdata->rbuf.buf);
89 OPENSSL_free(item->data);
93 unprocessed_rcds = d->unprocessed_rcds.q;
94 processed_rcds = d->processed_rcds.q;
95 buffered_app_data = d->buffered_app_data.q;
96 memset(d, 0, sizeof(*d));
97 d->unprocessed_rcds.q = unprocessed_rcds;
98 d->processed_rcds.q = processed_rcds;
99 d->buffered_app_data.q = buffered_app_data;
102 void DTLS_RECORD_LAYER_set_saved_w_epoch(RECORD_LAYER *rl, unsigned short e)
104 if (e == rl->d->w_epoch - 1) {
105 memcpy(rl->d->curr_write_sequence,
106 rl->write_sequence, sizeof(rl->write_sequence));
107 memcpy(rl->write_sequence,
108 rl->d->last_write_sequence, sizeof(rl->write_sequence));
109 } else if (e == rl->d->w_epoch + 1) {
110 memcpy(rl->d->last_write_sequence,
111 rl->write_sequence, sizeof(unsigned char[8]));
112 memcpy(rl->write_sequence,
113 rl->d->curr_write_sequence, sizeof(rl->write_sequence));
118 void DTLS_RECORD_LAYER_set_write_sequence(RECORD_LAYER *rl, unsigned char *seq)
120 memcpy(rl->write_sequence, seq, SEQ_NUM_SIZE);
123 /* copy buffered record into SSL structure */
124 static int dtls1_copy_record(SSL *s, pitem *item)
126 DTLS1_RECORD_DATA *rdata;
128 rdata = (DTLS1_RECORD_DATA *)item->data;
130 SSL3_BUFFER_release(&s->rlayer.rbuf);
132 s->rlayer.packet = rdata->packet;
133 s->rlayer.packet_length = rdata->packet_length;
134 memcpy(&s->rlayer.rbuf, &(rdata->rbuf), sizeof(SSL3_BUFFER));
135 memcpy(&s->rlayer.rrec, &(rdata->rrec), sizeof(SSL3_RECORD));
137 /* Set proper sequence number for mac calculation */
138 memcpy(&(s->rlayer.read_sequence[2]), &(rdata->packet[5]), 6);
143 int dtls1_buffer_record(SSL *s, record_pqueue *queue, unsigned char *priority)
145 DTLS1_RECORD_DATA *rdata;
148 /* Limit the size of the queue to prevent DOS attacks */
149 if (pqueue_size(queue->q) >= 100)
152 rdata = OPENSSL_malloc(sizeof(*rdata));
153 item = pitem_new(priority, rdata);
154 if (rdata == NULL || item == NULL) {
157 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DTLS1_BUFFER_RECORD,
158 ERR_R_INTERNAL_ERROR);
162 rdata->packet = s->rlayer.packet;
163 rdata->packet_length = s->rlayer.packet_length;
164 memcpy(&(rdata->rbuf), &s->rlayer.rbuf, sizeof(SSL3_BUFFER));
165 memcpy(&(rdata->rrec), &s->rlayer.rrec, sizeof(SSL3_RECORD));
169 #ifndef OPENSSL_NO_SCTP
170 /* Store bio_dgram_sctp_rcvinfo struct */
171 if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
172 (SSL_get_state(s) == TLS_ST_SR_FINISHED
173 || SSL_get_state(s) == TLS_ST_CR_FINISHED)) {
174 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_GET_RCVINFO,
175 sizeof(rdata->recordinfo), &rdata->recordinfo);
179 s->rlayer.packet = NULL;
180 s->rlayer.packet_length = 0;
181 memset(&s->rlayer.rbuf, 0, sizeof(s->rlayer.rbuf));
182 memset(&s->rlayer.rrec, 0, sizeof(s->rlayer.rrec));
184 if (!ssl3_setup_buffers(s)) {
185 /* SSLfatal() already called */
186 OPENSSL_free(rdata->rbuf.buf);
192 if (pqueue_insert(queue->q, item) == NULL) {
193 /* Must be a duplicate so ignore it */
194 OPENSSL_free(rdata->rbuf.buf);
202 int dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue)
206 item = pqueue_pop(queue->q);
208 dtls1_copy_record(s, item);
210 OPENSSL_free(item->data);
220 * retrieve a buffered record that belongs to the new epoch, i.e., not
223 #define dtls1_get_unprocessed_record(s) \
224 dtls1_retrieve_buffered_record((s), \
225 &((s)->rlayer.d->unprocessed_rcds))
227 int dtls1_process_buffered_records(SSL *s)
232 DTLS1_BITMAP *bitmap;
233 unsigned int is_next_epoch;
236 item = pqueue_peek(s->rlayer.d->unprocessed_rcds.q);
238 /* Check if epoch is current. */
239 if (s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch)
240 return 1; /* Nothing to do. */
242 rr = RECORD_LAYER_get_rrec(&s->rlayer);
244 rb = RECORD_LAYER_get_rbuf(&s->rlayer);
246 if (SSL3_BUFFER_get_left(rb) > 0) {
248 * We've still got data from the current packet to read. There could
249 * be a record from the new epoch in it - so don't overwrite it
250 * with the unprocessed records yet (we'll do it when we've
251 * finished reading the current packet).
256 /* Process all the records. */
257 while (pqueue_peek(s->rlayer.d->unprocessed_rcds.q)) {
258 dtls1_get_unprocessed_record(s);
259 bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch);
260 if (bitmap == NULL) {
262 * Should not happen. This will only ever be NULL when the
263 * current record is from a different epoch. But that cannot
264 * be the case because we already checked the epoch above
266 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
267 SSL_F_DTLS1_PROCESS_BUFFERED_RECORDS,
268 ERR_R_INTERNAL_ERROR);
271 #ifndef OPENSSL_NO_SCTP
272 /* Only do replay check if no SCTP bio */
273 if (!BIO_dgram_is_sctp(SSL_get_rbio(s)))
277 * Check whether this is a repeat, or aged record. We did this
278 * check once already when we first received the record - but
279 * we might have updated the window since then due to
280 * records we subsequently processed.
282 replayok = dtls1_record_replay_check(s, bitmap);
285 if (!replayok || !dtls1_process_record(s, bitmap)) {
286 if (ossl_statem_in_error(s)) {
287 /* dtls1_process_record called SSLfatal() */
290 /* dump this record */
292 RECORD_LAYER_reset_packet_length(&s->rlayer);
296 if (dtls1_buffer_record(s, &(s->rlayer.d->processed_rcds),
297 SSL3_RECORD_get_seq_num(s->rlayer.rrec)) < 0) {
298 /* SSLfatal() already called */
305 * sync epoch numbers once all the unprocessed records have been
308 s->rlayer.d->processed_rcds.epoch = s->rlayer.d->r_epoch;
309 s->rlayer.d->unprocessed_rcds.epoch = s->rlayer.d->r_epoch + 1;
315 * Return up to 'len' payload bytes received in 'type' records.
316 * 'type' is one of the following:
318 * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
319 * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
320 * - 0 (during a shutdown, no data has to be returned)
322 * If we don't have stored data to work from, read a SSL/TLS record first
323 * (possibly multiple records if we still don't have anything to return).
325 * This function must handle any surprises the peer may have for us, such as
326 * Alert records (e.g. close_notify) or renegotiation requests. ChangeCipherSpec
327 * messages are treated as if they were handshake messages *if* the |recd_type|
328 * argument is non NULL.
329 * Also if record payloads contain fragments too small to process, we store
330 * them until there is enough for the respective protocol (the record protocol
331 * may use arbitrary fragmentation and even interleaving):
332 * Change cipher spec protocol
333 * just 1 byte needed, no need for keeping anything stored
335 * 2 bytes needed (AlertLevel, AlertDescription)
337 * 4 bytes needed (HandshakeType, uint24 length) -- we just have
338 * to detect unexpected Client Hello and Hello Request messages
339 * here, anything else is handled by higher layers
340 * Application data protocol
341 * none of our business
343 int dtls1_read_bytes(SSL *s, int type, int *recvd_type, unsigned char *buf,
344 size_t len, int peek, size_t *readbytes)
349 void (*cb) (const SSL *ssl, int type2, int val) = NULL;
351 if (!SSL3_BUFFER_is_initialised(&s->rlayer.rbuf)) {
352 /* Not initialized yet */
353 if (!ssl3_setup_buffers(s)) {
354 /* SSLfatal() already called */
359 if ((type && (type != SSL3_RT_APPLICATION_DATA) &&
360 (type != SSL3_RT_HANDSHAKE)) ||
361 (peek && (type != SSL3_RT_APPLICATION_DATA))) {
362 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DTLS1_READ_BYTES,
363 ERR_R_INTERNAL_ERROR);
367 if (!ossl_statem_get_in_handshake(s) && SSL_in_init(s)) {
368 /* type == SSL3_RT_APPLICATION_DATA */
369 i = s->handshake_func(s);
370 /* SSLfatal() already called if appropriate */
378 s->rwstate = SSL_NOTHING;
381 * s->s3.rrec.type - is the type of record
382 * s->s3.rrec.data, - data
383 * s->s3.rrec.off, - offset into 'data' for next read
384 * s->s3.rrec.length, - number of bytes.
389 * We are not handshaking and have no data yet, so process data buffered
390 * during the last handshake in advance, if any.
392 if (SSL_is_init_finished(s) && SSL3_RECORD_get_length(rr) == 0) {
394 item = pqueue_pop(s->rlayer.d->buffered_app_data.q);
396 #ifndef OPENSSL_NO_SCTP
397 /* Restore bio_dgram_sctp_rcvinfo struct */
398 if (BIO_dgram_is_sctp(SSL_get_rbio(s))) {
399 DTLS1_RECORD_DATA *rdata = (DTLS1_RECORD_DATA *)item->data;
400 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_SET_RCVINFO,
401 sizeof(rdata->recordinfo), &rdata->recordinfo);
405 dtls1_copy_record(s, item);
407 OPENSSL_free(item->data);
412 /* Check for timeout */
413 if (dtls1_handle_timeout(s) > 0) {
415 } else if (ossl_statem_in_error(s)) {
416 /* dtls1_handle_timeout() has failed with a fatal error */
420 /* get new packet if necessary */
421 if ((SSL3_RECORD_get_length(rr) == 0)
422 || (s->rlayer.rstate == SSL_ST_READ_BODY)) {
423 RECORD_LAYER_set_numrpipes(&s->rlayer, 0);
424 iret = dtls1_get_record(s);
426 iret = dtls1_read_failed(s, iret);
428 * Anything other than a timeout is an error. SSLfatal() already
429 * called if appropriate.
436 RECORD_LAYER_set_numrpipes(&s->rlayer, 1);
440 * Reset the count of consecutive warning alerts if we've got a non-empty
441 * record that isn't an alert.
443 if (SSL3_RECORD_get_type(rr) != SSL3_RT_ALERT
444 && SSL3_RECORD_get_length(rr) != 0)
445 s->rlayer.alert_count = 0;
447 /* we now have a packet which can be read and processed */
449 if (s->s3.change_cipher_spec /* set when we receive ChangeCipherSpec,
450 * reset by ssl3_get_finished */
451 && (SSL3_RECORD_get_type(rr) != SSL3_RT_HANDSHAKE)) {
453 * We now have application data between CCS and Finished. Most likely
454 * the packets were reordered on their way, so buffer the application
455 * data for later processing rather than dropping the connection.
457 if (dtls1_buffer_record(s, &(s->rlayer.d->buffered_app_data),
458 SSL3_RECORD_get_seq_num(rr)) < 0) {
459 /* SSLfatal() already called */
462 SSL3_RECORD_set_length(rr, 0);
463 SSL3_RECORD_set_read(rr);
468 * If the other end has shut down, throw anything we read away (even in
471 if (s->shutdown & SSL_RECEIVED_SHUTDOWN) {
472 SSL3_RECORD_set_length(rr, 0);
473 SSL3_RECORD_set_read(rr);
474 s->rwstate = SSL_NOTHING;
478 if (type == SSL3_RECORD_get_type(rr)
479 || (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC
480 && type == SSL3_RT_HANDSHAKE && recvd_type != NULL)) {
482 * SSL3_RT_APPLICATION_DATA or
483 * SSL3_RT_HANDSHAKE or
484 * SSL3_RT_CHANGE_CIPHER_SPEC
487 * make sure that we are not getting application data when we are
488 * doing a handshake for the first time
490 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
491 (s->enc_read_ctx == NULL)) {
492 SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_DTLS1_READ_BYTES,
493 SSL_R_APP_DATA_IN_HANDSHAKE);
497 if (recvd_type != NULL)
498 *recvd_type = SSL3_RECORD_get_type(rr);
502 * Mark a zero length record as read. This ensures multiple calls to
503 * SSL_read() with a zero length buffer will eventually cause
504 * SSL_pending() to report data as being available.
506 if (SSL3_RECORD_get_length(rr) == 0)
507 SSL3_RECORD_set_read(rr);
511 if (len > SSL3_RECORD_get_length(rr))
512 n = SSL3_RECORD_get_length(rr);
516 memcpy(buf, &(SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)]), n);
518 if (SSL3_RECORD_get_length(rr) == 0)
519 SSL3_RECORD_set_read(rr);
521 if (s->options & SSL_OP_CLEANSE_PLAINTEXT)
522 OPENSSL_cleanse(&(SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)]), n);
523 SSL3_RECORD_sub_length(rr, n);
524 SSL3_RECORD_add_off(rr, n);
525 if (SSL3_RECORD_get_length(rr) == 0) {
526 s->rlayer.rstate = SSL_ST_READ_HEADER;
527 SSL3_RECORD_set_off(rr, 0);
528 SSL3_RECORD_set_read(rr);
531 #ifndef OPENSSL_NO_SCTP
533 * We might had to delay a close_notify alert because of reordered
534 * app data. If there was an alert and there is no message to read
535 * anymore, finally set shutdown.
537 if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
538 s->d1->shutdown_received
539 && !BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
540 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
549 * If we get here, then type != rr->type; if we have a handshake message,
550 * then it was unexpected (Hello Request or Client Hello).
553 if (SSL3_RECORD_get_type(rr) == SSL3_RT_ALERT) {
554 unsigned int alert_level, alert_descr;
555 unsigned char *alert_bytes = SSL3_RECORD_get_data(rr)
556 + SSL3_RECORD_get_off(rr);
559 if (!PACKET_buf_init(&alert, alert_bytes, SSL3_RECORD_get_length(rr))
560 || !PACKET_get_1(&alert, &alert_level)
561 || !PACKET_get_1(&alert, &alert_descr)
562 || PACKET_remaining(&alert) != 0) {
563 SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_DTLS1_READ_BYTES,
564 SSL_R_INVALID_ALERT);
569 s->msg_callback(0, s->version, SSL3_RT_ALERT, alert_bytes, 2, s,
570 s->msg_callback_arg);
572 if (s->info_callback != NULL)
573 cb = s->info_callback;
574 else if (s->ctx->info_callback != NULL)
575 cb = s->ctx->info_callback;
578 j = (alert_level << 8) | alert_descr;
579 cb(s, SSL_CB_READ_ALERT, j);
582 if (alert_level == SSL3_AL_WARNING) {
583 s->s3.warn_alert = alert_descr;
584 SSL3_RECORD_set_read(rr);
586 s->rlayer.alert_count++;
587 if (s->rlayer.alert_count == MAX_WARN_ALERT_COUNT) {
588 SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_DTLS1_READ_BYTES,
589 SSL_R_TOO_MANY_WARN_ALERTS);
593 if (alert_descr == SSL_AD_CLOSE_NOTIFY) {
594 #ifndef OPENSSL_NO_SCTP
596 * With SCTP and streams the socket may deliver app data
597 * after a close_notify alert. We have to check this first so
598 * that nothing gets discarded.
600 if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
601 BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
602 s->d1->shutdown_received = 1;
603 s->rwstate = SSL_READING;
604 BIO_clear_retry_flags(SSL_get_rbio(s));
605 BIO_set_retry_read(SSL_get_rbio(s));
609 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
612 } else if (alert_level == SSL3_AL_FATAL) {
615 s->rwstate = SSL_NOTHING;
616 s->s3.fatal_alert = alert_descr;
617 SSLfatal(s, SSL_AD_NO_ALERT, SSL_F_DTLS1_READ_BYTES,
618 SSL_AD_REASON_OFFSET + alert_descr);
619 BIO_snprintf(tmp, sizeof tmp, "%d", alert_descr);
620 ERR_add_error_data(2, "SSL alert number ", tmp);
621 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
622 SSL3_RECORD_set_read(rr);
623 SSL_CTX_remove_session(s->session_ctx, s->session);
626 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_DTLS1_READ_BYTES,
627 SSL_R_UNKNOWN_ALERT_TYPE);
634 if (s->shutdown & SSL_SENT_SHUTDOWN) { /* but we have not received a
636 s->rwstate = SSL_NOTHING;
637 SSL3_RECORD_set_length(rr, 0);
638 SSL3_RECORD_set_read(rr);
642 if (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC) {
644 * We can't process a CCS now, because previous handshake messages
645 * are still missing, so just drop it.
647 SSL3_RECORD_set_length(rr, 0);
648 SSL3_RECORD_set_read(rr);
653 * Unexpected handshake message (Client Hello, or protocol violation)
655 if ((SSL3_RECORD_get_type(rr) == SSL3_RT_HANDSHAKE) &&
656 !ossl_statem_get_in_handshake(s)) {
657 struct hm_header_st msg_hdr;
660 * This may just be a stale retransmit. Also sanity check that we have
661 * at least enough record bytes for a message header
663 if (SSL3_RECORD_get_epoch(rr) != s->rlayer.d->r_epoch
664 || SSL3_RECORD_get_length(rr) < DTLS1_HM_HEADER_LENGTH) {
665 SSL3_RECORD_set_length(rr, 0);
666 SSL3_RECORD_set_read(rr);
670 dtls1_get_message_header(rr->data, &msg_hdr);
673 * If we are server, we may have a repeated FINISHED of the client
674 * here, then retransmit our CCS and FINISHED.
676 if (msg_hdr.type == SSL3_MT_FINISHED) {
677 if (dtls1_check_timeout_num(s) < 0) {
678 /* SSLfatal) already called */
682 if (dtls1_retransmit_buffered_messages(s) <= 0) {
683 /* Fail if we encountered a fatal error */
684 if (ossl_statem_in_error(s))
687 SSL3_RECORD_set_length(rr, 0);
688 SSL3_RECORD_set_read(rr);
689 if (!(s->mode & SSL_MODE_AUTO_RETRY)) {
690 if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) {
691 /* no read-ahead left? */
694 s->rwstate = SSL_READING;
695 bio = SSL_get_rbio(s);
696 BIO_clear_retry_flags(bio);
697 BIO_set_retry_read(bio);
705 * To get here we must be trying to read app data but found handshake
706 * data. But if we're trying to read app data, and we're not in init
707 * (which is tested for at the top of this function) then init must be
710 if (!ossl_assert(SSL_is_init_finished(s))) {
711 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DTLS1_READ_BYTES,
712 ERR_R_INTERNAL_ERROR);
716 /* We found handshake data, so we're going back into init */
717 ossl_statem_set_in_init(s, 1);
719 i = s->handshake_func(s);
720 /* SSLfatal() called if appropriate */
726 if (!(s->mode & SSL_MODE_AUTO_RETRY)) {
727 if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) {
728 /* no read-ahead left? */
731 * In the case where we try to read application data, but we
732 * trigger an SSL handshake, we return -1 with the retry
733 * option set. Otherwise renegotiation may cause nasty
734 * problems in the blocking world
736 s->rwstate = SSL_READING;
737 bio = SSL_get_rbio(s);
738 BIO_clear_retry_flags(bio);
739 BIO_set_retry_read(bio);
746 switch (SSL3_RECORD_get_type(rr)) {
748 SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_DTLS1_READ_BYTES,
749 SSL_R_UNEXPECTED_RECORD);
751 case SSL3_RT_CHANGE_CIPHER_SPEC:
753 case SSL3_RT_HANDSHAKE:
755 * we already handled all of these, with the possible exception of
756 * SSL3_RT_HANDSHAKE when ossl_statem_get_in_handshake(s) is true, but
757 * that should not happen when type != rr->type
759 SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_DTLS1_READ_BYTES,
760 ERR_R_INTERNAL_ERROR);
762 case SSL3_RT_APPLICATION_DATA:
764 * At this point, we were expecting handshake data, but have
765 * application data. If the library was running inside ssl3_read()
766 * (i.e. in_read_app_data is set) and it makes sense to read
767 * application data at this point (session renegotiation not yet
768 * started), we will indulge it.
770 if (s->s3.in_read_app_data &&
771 (s->s3.total_renegotiations != 0) &&
772 ossl_statem_app_data_allowed(s)) {
773 s->s3.in_read_app_data = 2;
776 SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_DTLS1_READ_BYTES,
777 SSL_R_UNEXPECTED_RECORD);
785 * Call this to write data in records of type 'type' It will return <= 0 if
786 * not all data has been sent or non-blocking IO.
788 int dtls1_write_bytes(SSL *s, int type, const void *buf, size_t len,
793 if (!ossl_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH)) {
794 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DTLS1_WRITE_BYTES,
795 ERR_R_INTERNAL_ERROR);
798 s->rwstate = SSL_NOTHING;
799 i = do_dtls1_write(s, type, buf, len, 0, written);
803 int do_dtls1_write(SSL *s, int type, const unsigned char *buf,
804 size_t len, int create_empty_fragment, size_t *written)
806 unsigned char *p, *pseq;
807 int i, mac_size, clear = 0;
808 size_t prefix_len = 0;
814 wb = &s->rlayer.wbuf[0];
817 * first check if there is a SSL3_BUFFER still being written out. This
818 * will happen with non blocking IO
820 if (!ossl_assert(SSL3_BUFFER_get_left(wb) == 0)) {
821 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DO_DTLS1_WRITE,
822 ERR_R_INTERNAL_ERROR);
826 /* If we have an alert to send, lets send it */
827 if (s->s3.alert_dispatch) {
828 i = s->method->ssl_dispatch_alert(s);
831 /* if it went, fall through and send more stuff */
834 if (len == 0 && !create_empty_fragment)
837 if (len > ssl_get_max_send_fragment(s)) {
838 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DO_DTLS1_WRITE,
839 SSL_R_EXCEEDS_MAX_FRAGMENT_SIZE);
845 if ((sess == NULL) ||
846 (s->enc_write_ctx == NULL) || (EVP_MD_CTX_md(s->write_hash) == NULL))
852 mac_size = EVP_MD_CTX_size(s->write_hash);
854 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DO_DTLS1_WRITE,
855 SSL_R_EXCEEDS_MAX_FRAGMENT_SIZE);
860 p = SSL3_BUFFER_get_buf(wb) + prefix_len;
862 /* write the header */
864 *(p++) = type & 0xff;
865 SSL3_RECORD_set_type(&wr, type);
867 * Special case: for hello verify request, client version 1.0 and we
868 * haven't decided which version to use yet send back using version 1.0
869 * header: otherwise some clients will ignore it.
871 if (s->method->version == DTLS_ANY_VERSION &&
872 s->max_proto_version != DTLS1_BAD_VER) {
873 *(p++) = DTLS1_VERSION >> 8;
874 *(p++) = DTLS1_VERSION & 0xff;
876 *(p++) = s->version >> 8;
877 *(p++) = s->version & 0xff;
880 /* field where we are to write out packet epoch, seq num and len */
884 /* Explicit IV length, block ciphers appropriate version flag */
885 if (s->enc_write_ctx) {
886 int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx);
887 if (mode == EVP_CIPH_CBC_MODE) {
888 eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx);
892 /* Need explicit part of IV for GCM mode */
893 else if (mode == EVP_CIPH_GCM_MODE)
894 eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN;
895 else if (mode == EVP_CIPH_CCM_MODE)
896 eivlen = EVP_CCM_TLS_EXPLICIT_IV_LEN;
902 /* lets setup the record stuff. */
903 SSL3_RECORD_set_data(&wr, p + eivlen); /* make room for IV in case of CBC */
904 SSL3_RECORD_set_length(&wr, len);
905 SSL3_RECORD_set_input(&wr, (unsigned char *)buf);
908 * we now 'read' from wr.input, wr.length bytes into wr.data
911 /* first we compress */
912 if (s->compress != NULL) {
913 if (!ssl3_do_compress(s, &wr)) {
914 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DO_DTLS1_WRITE,
915 SSL_R_COMPRESSION_FAILURE);
919 memcpy(SSL3_RECORD_get_data(&wr), SSL3_RECORD_get_input(&wr),
920 SSL3_RECORD_get_length(&wr));
921 SSL3_RECORD_reset_input(&wr);
925 * we should still have the output to wr.data and the input from
926 * wr.input. Length should be wr.length. wr.data still points in the
930 if (!SSL_WRITE_ETM(s) && mac_size != 0) {
931 if (!s->method->ssl3_enc->mac(s, &wr,
932 &(p[SSL3_RECORD_get_length(&wr) + eivlen]),
934 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DO_DTLS1_WRITE,
935 ERR_R_INTERNAL_ERROR);
938 SSL3_RECORD_add_length(&wr, mac_size);
941 /* this is true regardless of mac size */
942 SSL3_RECORD_set_data(&wr, p);
943 SSL3_RECORD_reset_input(&wr);
946 SSL3_RECORD_add_length(&wr, eivlen);
948 if (s->method->ssl3_enc->enc(s, &wr, 1, 1, NULL, mac_size) < 1) {
949 if (!ossl_statem_in_error(s)) {
950 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DO_DTLS1_WRITE,
951 ERR_R_INTERNAL_ERROR);
956 if (SSL_WRITE_ETM(s) && mac_size != 0) {
957 if (!s->method->ssl3_enc->mac(s, &wr,
958 &(p[SSL3_RECORD_get_length(&wr)]), 1)) {
959 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DO_DTLS1_WRITE,
960 ERR_R_INTERNAL_ERROR);
963 SSL3_RECORD_add_length(&wr, mac_size);
966 /* record length after mac and block padding */
968 /* there's only one epoch between handshake and app data */
970 s2n(s->rlayer.d->w_epoch, pseq);
972 memcpy(pseq, &(s->rlayer.write_sequence[2]), 6);
974 s2n(SSL3_RECORD_get_length(&wr), pseq);
977 s->msg_callback(1, 0, SSL3_RT_HEADER, pseq - DTLS1_RT_HEADER_LENGTH,
978 DTLS1_RT_HEADER_LENGTH, s, s->msg_callback_arg);
981 * we should now have wr.data pointing to the encrypted data, which is
984 SSL3_RECORD_set_type(&wr, type); /* not needed but helps for debugging */
985 SSL3_RECORD_add_length(&wr, DTLS1_RT_HEADER_LENGTH);
987 ssl3_record_sequence_update(&(s->rlayer.write_sequence[0]));
989 if (create_empty_fragment) {
991 * we are in a recursive call; just return the length, don't write
994 *written = wr.length;
998 /* now let's set up wb */
999 SSL3_BUFFER_set_left(wb, prefix_len + SSL3_RECORD_get_length(&wr));
1000 SSL3_BUFFER_set_offset(wb, 0);
1003 * memorize arguments so that ssl3_write_pending can detect bad write
1006 s->rlayer.wpend_tot = len;
1007 s->rlayer.wpend_buf = buf;
1008 s->rlayer.wpend_type = type;
1009 s->rlayer.wpend_ret = len;
1011 /* we now just need to write the buffer. Calls SSLfatal() as required. */
1012 return ssl3_write_pending(s, type, buf, len, written);
1015 DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr,
1016 unsigned int *is_next_epoch)
1021 /* In current epoch, accept HM, CCS, DATA, & ALERT */
1022 if (rr->epoch == s->rlayer.d->r_epoch)
1023 return &s->rlayer.d->bitmap;
1026 * Only HM and ALERT messages can be from the next epoch and only if we
1027 * have already processed all of the unprocessed records from the last
1030 else if (rr->epoch == (unsigned long)(s->rlayer.d->r_epoch + 1) &&
1031 s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch &&
1032 (rr->type == SSL3_RT_HANDSHAKE || rr->type == SSL3_RT_ALERT)) {
1034 return &s->rlayer.d->next_bitmap;
1040 void dtls1_reset_seq_numbers(SSL *s, int rw)
1043 unsigned int seq_bytes = sizeof(s->rlayer.read_sequence);
1045 if (rw & SSL3_CC_READ) {
1046 seq = s->rlayer.read_sequence;
1047 s->rlayer.d->r_epoch++;
1048 memcpy(&s->rlayer.d->bitmap, &s->rlayer.d->next_bitmap,
1049 sizeof(s->rlayer.d->bitmap));
1050 memset(&s->rlayer.d->next_bitmap, 0, sizeof(s->rlayer.d->next_bitmap));
1053 * We must not use any buffered messages received from the previous
1056 dtls1_clear_received_buffer(s);
1058 seq = s->rlayer.write_sequence;
1059 memcpy(s->rlayer.d->last_write_sequence, seq,
1060 sizeof(s->rlayer.write_sequence));
1061 s->rlayer.d->w_epoch++;
1064 memset(seq, 0, seq_bytes);