2 * Copyright 2005-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (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
13 #include "../ssl_locl.h"
14 #include <openssl/evp.h>
15 #include <openssl/buffer.h>
16 #include "record_locl.h"
18 #include "../packet_locl.h"
20 int DTLS_RECORD_LAYER_new(RECORD_LAYER *rl)
24 if ((d = OPENSSL_malloc(sizeof(*d))) == NULL)
29 d->unprocessed_rcds.q = pqueue_new();
30 d->processed_rcds.q = pqueue_new();
31 d->buffered_app_data.q = pqueue_new();
33 if (d->unprocessed_rcds.q == NULL || d->processed_rcds.q == NULL
34 || d->buffered_app_data.q == NULL) {
35 pqueue_free(d->unprocessed_rcds.q);
36 pqueue_free(d->processed_rcds.q);
37 pqueue_free(d->buffered_app_data.q);
46 void DTLS_RECORD_LAYER_free(RECORD_LAYER *rl)
48 DTLS_RECORD_LAYER_clear(rl);
49 pqueue_free(rl->d->unprocessed_rcds.q);
50 pqueue_free(rl->d->processed_rcds.q);
51 pqueue_free(rl->d->buffered_app_data.q);
56 void DTLS_RECORD_LAYER_clear(RECORD_LAYER *rl)
60 DTLS1_RECORD_DATA *rdata;
61 pqueue *unprocessed_rcds;
62 pqueue *processed_rcds;
63 pqueue *buffered_app_data;
67 while ((item = pqueue_pop(d->unprocessed_rcds.q)) != NULL) {
68 rdata = (DTLS1_RECORD_DATA *)item->data;
69 OPENSSL_free(rdata->rbuf.buf);
70 OPENSSL_free(item->data);
74 while ((item = pqueue_pop(d->processed_rcds.q)) != NULL) {
75 rdata = (DTLS1_RECORD_DATA *)item->data;
76 OPENSSL_free(rdata->rbuf.buf);
77 OPENSSL_free(item->data);
81 while ((item = pqueue_pop(d->buffered_app_data.q)) != NULL) {
82 rdata = (DTLS1_RECORD_DATA *)item->data;
83 OPENSSL_free(rdata->rbuf.buf);
84 OPENSSL_free(item->data);
88 unprocessed_rcds = d->unprocessed_rcds.q;
89 processed_rcds = d->processed_rcds.q;
90 buffered_app_data = d->buffered_app_data.q;
91 memset(d, 0, sizeof(*d));
92 d->unprocessed_rcds.q = unprocessed_rcds;
93 d->processed_rcds.q = processed_rcds;
94 d->buffered_app_data.q = buffered_app_data;
97 void DTLS_RECORD_LAYER_set_saved_w_epoch(RECORD_LAYER *rl, unsigned short e)
99 if (e == rl->d->w_epoch - 1) {
100 memcpy(rl->d->curr_write_sequence,
101 rl->write_sequence, sizeof(rl->write_sequence));
102 memcpy(rl->write_sequence,
103 rl->d->last_write_sequence, sizeof(rl->write_sequence));
104 } else if (e == rl->d->w_epoch + 1) {
105 memcpy(rl->d->last_write_sequence,
106 rl->write_sequence, sizeof(unsigned char[8]));
107 memcpy(rl->write_sequence,
108 rl->d->curr_write_sequence, sizeof(rl->write_sequence));
113 void DTLS_RECORD_LAYER_set_write_sequence(RECORD_LAYER *rl, unsigned char *seq)
115 memcpy(rl->write_sequence, seq, SEQ_NUM_SIZE);
118 /* copy buffered record into SSL structure */
119 static int dtls1_copy_record(SSL *s, pitem *item)
121 DTLS1_RECORD_DATA *rdata;
123 rdata = (DTLS1_RECORD_DATA *)item->data;
125 SSL3_BUFFER_release(&s->rlayer.rbuf);
127 s->rlayer.packet = rdata->packet;
128 s->rlayer.packet_length = rdata->packet_length;
129 memcpy(&s->rlayer.rbuf, &(rdata->rbuf), sizeof(SSL3_BUFFER));
130 memcpy(&s->rlayer.rrec, &(rdata->rrec), sizeof(SSL3_RECORD));
132 /* Set proper sequence number for mac calculation */
133 memcpy(&(s->rlayer.read_sequence[2]), &(rdata->packet[5]), 6);
138 int dtls1_buffer_record(SSL *s, record_pqueue *queue, unsigned char *priority)
140 DTLS1_RECORD_DATA *rdata;
143 /* Limit the size of the queue to prevent DOS attacks */
144 if (pqueue_size(queue->q) >= 100)
147 rdata = OPENSSL_malloc(sizeof(*rdata));
148 item = pitem_new(priority, rdata);
149 if (rdata == NULL || item == NULL) {
152 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
156 rdata->packet = s->rlayer.packet;
157 rdata->packet_length = s->rlayer.packet_length;
158 memcpy(&(rdata->rbuf), &s->rlayer.rbuf, sizeof(SSL3_BUFFER));
159 memcpy(&(rdata->rrec), &s->rlayer.rrec, sizeof(SSL3_RECORD));
163 #ifndef OPENSSL_NO_SCTP
164 /* Store bio_dgram_sctp_rcvinfo struct */
165 if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
166 (SSL_get_state(s) == TLS_ST_SR_FINISHED
167 || SSL_get_state(s) == TLS_ST_CR_FINISHED)) {
168 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_GET_RCVINFO,
169 sizeof(rdata->recordinfo), &rdata->recordinfo);
173 s->rlayer.packet = NULL;
174 s->rlayer.packet_length = 0;
175 memset(&s->rlayer.rbuf, 0, sizeof(s->rlayer.rbuf));
176 memset(&s->rlayer.rrec, 0, sizeof(s->rlayer.rrec));
178 if (!ssl3_setup_buffers(s)) {
179 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
180 OPENSSL_free(rdata->rbuf.buf);
186 /* insert should not fail, since duplicates are dropped */
187 if (pqueue_insert(queue->q, item) == NULL) {
188 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
189 OPENSSL_free(rdata->rbuf.buf);
198 int dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue)
202 item = pqueue_pop(queue->q);
204 dtls1_copy_record(s, item);
206 OPENSSL_free(item->data);
216 * retrieve a buffered record that belongs to the new epoch, i.e., not
219 #define dtls1_get_unprocessed_record(s) \
220 dtls1_retrieve_buffered_record((s), \
221 &((s)->rlayer.d->unprocessed_rcds))
223 int dtls1_process_buffered_records(SSL *s)
228 DTLS1_BITMAP *bitmap;
229 unsigned int is_next_epoch;
232 item = pqueue_peek(s->rlayer.d->unprocessed_rcds.q);
234 /* Check if epoch is current. */
235 if (s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch)
236 return 1; /* Nothing to do. */
238 rr = RECORD_LAYER_get_rrec(&s->rlayer);
240 rb = RECORD_LAYER_get_rbuf(&s->rlayer);
242 if (SSL3_BUFFER_get_left(rb) > 0) {
244 * We've still got data from the current packet to read. There could
245 * be a record from the new epoch in it - so don't overwrite it
246 * with the unprocessed records yet (we'll do it when we've
247 * finished reading the current packet).
252 /* Process all the records. */
253 while (pqueue_peek(s->rlayer.d->unprocessed_rcds.q)) {
254 dtls1_get_unprocessed_record(s);
255 bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch);
256 if (bitmap == NULL) {
258 * Should not happen. This will only ever be NULL when the
259 * current record is from a different epoch. But that cannot
260 * be the case because we already checked the epoch above
262 SSLerr(SSL_F_DTLS1_PROCESS_BUFFERED_RECORDS,
263 ERR_R_INTERNAL_ERROR);
266 #ifndef OPENSSL_NO_SCTP
267 /* Only do replay check if no SCTP bio */
268 if (!BIO_dgram_is_sctp(SSL_get_rbio(s)))
272 * Check whether this is a repeat, or aged record. We did this
273 * check once already when we first received the record - but
274 * we might have updated the window since then due to
275 * records we subsequently processed.
277 replayok = dtls1_record_replay_check(s, bitmap);
280 if (!replayok || !dtls1_process_record(s, bitmap)) {
281 /* dump this record */
283 RECORD_LAYER_reset_packet_length(&s->rlayer);
287 if (dtls1_buffer_record(s, &(s->rlayer.d->processed_rcds),
288 SSL3_RECORD_get_seq_num(s->rlayer.rrec)) < 0)
294 * sync epoch numbers once all the unprocessed records have been
297 s->rlayer.d->processed_rcds.epoch = s->rlayer.d->r_epoch;
298 s->rlayer.d->unprocessed_rcds.epoch = s->rlayer.d->r_epoch + 1;
304 * Return up to 'len' payload bytes received in 'type' records.
305 * 'type' is one of the following:
307 * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
308 * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
309 * - 0 (during a shutdown, no data has to be returned)
311 * If we don't have stored data to work from, read a SSL/TLS record first
312 * (possibly multiple records if we still don't have anything to return).
314 * This function must handle any surprises the peer may have for us, such as
315 * Alert records (e.g. close_notify) or renegotiation requests. ChangeCipherSpec
316 * messages are treated as if they were handshake messages *if* the |recd_type|
317 * argument is non NULL.
318 * Also if record payloads contain fragments too small to process, we store
319 * them until there is enough for the respective protocol (the record protocol
320 * may use arbitrary fragmentation and even interleaving):
321 * Change cipher spec protocol
322 * just 1 byte needed, no need for keeping anything stored
324 * 2 bytes needed (AlertLevel, AlertDescription)
326 * 4 bytes needed (HandshakeType, uint24 length) -- we just have
327 * to detect unexpected Client Hello and Hello Request messages
328 * here, anything else is handled by higher layers
329 * Application data protocol
330 * none of our business
332 int dtls1_read_bytes(SSL *s, int type, int *recvd_type, unsigned char *buf,
333 size_t len, int peek, size_t *readbytes)
338 void (*cb) (const SSL *ssl, int type2, int val) = NULL;
340 if (!SSL3_BUFFER_is_initialised(&s->rlayer.rbuf)) {
341 /* Not initialized yet */
342 if (!ssl3_setup_buffers(s))
346 if ((type && (type != SSL3_RT_APPLICATION_DATA) &&
347 (type != SSL3_RT_HANDSHAKE)) ||
348 (peek && (type != SSL3_RT_APPLICATION_DATA))) {
349 SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
353 if (!ossl_statem_get_in_handshake(s) && SSL_in_init(s))
355 /* type == SSL3_RT_APPLICATION_DATA */
356 i = s->handshake_func(s);
360 SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE);
366 s->rwstate = SSL_NOTHING;
369 * s->s3->rrec.type - is the type of record
370 * s->s3->rrec.data, - data
371 * s->s3->rrec.off, - offset into 'data' for next read
372 * s->s3->rrec.length, - number of bytes.
377 * We are not handshaking and have no data yet, so process data buffered
378 * during the last handshake in advance, if any.
380 if (SSL_is_init_finished(s) && SSL3_RECORD_get_length(rr) == 0) {
382 item = pqueue_pop(s->rlayer.d->buffered_app_data.q);
384 #ifndef OPENSSL_NO_SCTP
385 /* Restore bio_dgram_sctp_rcvinfo struct */
386 if (BIO_dgram_is_sctp(SSL_get_rbio(s))) {
387 DTLS1_RECORD_DATA *rdata = (DTLS1_RECORD_DATA *)item->data;
388 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_SET_RCVINFO,
389 sizeof(rdata->recordinfo), &rdata->recordinfo);
393 dtls1_copy_record(s, item);
395 OPENSSL_free(item->data);
400 /* Check for timeout */
401 if (dtls1_handle_timeout(s) > 0)
404 /* get new packet if necessary */
405 if ((SSL3_RECORD_get_length(rr) == 0)
406 || (s->rlayer.rstate == SSL_ST_READ_BODY)) {
407 iret = dtls1_get_record(s);
409 iret = dtls1_read_failed(s, iret);
410 /* anything other than a timeout is an error */
419 * Reset the count of consecutive warning alerts if we've got a non-empty
420 * record that isn't an alert.
422 if (SSL3_RECORD_get_type(rr) != SSL3_RT_ALERT
423 && SSL3_RECORD_get_length(rr) != 0)
424 s->rlayer.alert_count = 0;
426 /* we now have a packet which can be read and processed */
428 if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
429 * reset by ssl3_get_finished */
430 && (SSL3_RECORD_get_type(rr) != SSL3_RT_HANDSHAKE)) {
432 * We now have application data between CCS and Finished. Most likely
433 * the packets were reordered on their way, so buffer the application
434 * data for later processing rather than dropping the connection.
436 if (dtls1_buffer_record(s, &(s->rlayer.d->buffered_app_data),
437 SSL3_RECORD_get_seq_num(rr)) < 0) {
438 SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
441 SSL3_RECORD_set_length(rr, 0);
446 * If the other end has shut down, throw anything we read away (even in
449 if (s->shutdown & SSL_RECEIVED_SHUTDOWN) {
450 SSL3_RECORD_set_length(rr, 0);
451 s->rwstate = SSL_NOTHING;
455 if (type == SSL3_RECORD_get_type(rr)
456 || (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC
457 && type == SSL3_RT_HANDSHAKE && recvd_type != NULL)) {
459 * SSL3_RT_APPLICATION_DATA or
460 * SSL3_RT_HANDSHAKE or
461 * SSL3_RT_CHANGE_CIPHER_SPEC
464 * make sure that we are not getting application data when we are
465 * doing a handshake for the first time
467 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
468 (s->enc_read_ctx == NULL)) {
469 al = SSL_AD_UNEXPECTED_MESSAGE;
470 SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_APP_DATA_IN_HANDSHAKE);
474 if (recvd_type != NULL)
475 *recvd_type = SSL3_RECORD_get_type(rr);
480 if (len > SSL3_RECORD_get_length(rr))
481 n = SSL3_RECORD_get_length(rr);
485 memcpy(buf, &(SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)]), n);
487 SSL3_RECORD_sub_length(rr, n);
488 SSL3_RECORD_add_off(rr, n);
489 if (SSL3_RECORD_get_length(rr) == 0) {
490 s->rlayer.rstate = SSL_ST_READ_HEADER;
491 SSL3_RECORD_set_off(rr, 0);
494 #ifndef OPENSSL_NO_SCTP
496 * We might had to delay a close_notify alert because of reordered
497 * app data. If there was an alert and there is no message to read
498 * anymore, finally set shutdown.
500 if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
501 s->d1->shutdown_received
502 && !BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
503 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
512 * If we get here, then type != rr->type; if we have a handshake message,
513 * then it was unexpected (Hello Request or Client Hello).
516 if (SSL3_RECORD_get_type(rr) == SSL3_RT_ALERT) {
517 unsigned int alert_level, alert_descr;
518 unsigned char *alert_bytes = SSL3_RECORD_get_data(rr)
519 + SSL3_RECORD_get_off(rr);
522 if (!PACKET_buf_init(&alert, alert_bytes, SSL3_RECORD_get_length(rr))
523 || !PACKET_get_1(&alert, &alert_level)
524 || !PACKET_get_1(&alert, &alert_descr)
525 || PACKET_remaining(&alert) != 0) {
526 al = SSL_AD_UNEXPECTED_MESSAGE;
527 SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_INVALID_ALERT);
532 s->msg_callback(0, s->version, SSL3_RT_ALERT, alert_bytes, 2, s,
533 s->msg_callback_arg);
535 if (s->info_callback != NULL)
536 cb = s->info_callback;
537 else if (s->ctx->info_callback != NULL)
538 cb = s->ctx->info_callback;
541 j = (alert_level << 8) | alert_descr;
542 cb(s, SSL_CB_READ_ALERT, j);
545 if (alert_level == SSL3_AL_WARNING) {
546 s->s3->warn_alert = alert_descr;
548 s->rlayer.alert_count++;
549 if (s->rlayer.alert_count == MAX_WARN_ALERT_COUNT) {
550 al = SSL_AD_UNEXPECTED_MESSAGE;
551 SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_TOO_MANY_WARN_ALERTS);
555 if (alert_descr == SSL_AD_CLOSE_NOTIFY) {
556 #ifndef OPENSSL_NO_SCTP
558 * With SCTP and streams the socket may deliver app data
559 * after a close_notify alert. We have to check this first so
560 * that nothing gets discarded.
562 if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
563 BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
564 s->d1->shutdown_received = 1;
565 s->rwstate = SSL_READING;
566 BIO_clear_retry_flags(SSL_get_rbio(s));
567 BIO_set_retry_read(SSL_get_rbio(s));
571 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
574 } else if (alert_level == SSL3_AL_FATAL) {
577 s->rwstate = SSL_NOTHING;
578 s->s3->fatal_alert = alert_descr;
579 SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
580 BIO_snprintf(tmp, sizeof tmp, "%d", alert_descr);
581 ERR_add_error_data(2, "SSL alert number ", tmp);
582 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
583 SSL_CTX_remove_session(s->session_ctx, s->session);
586 al = SSL_AD_ILLEGAL_PARAMETER;
587 SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNKNOWN_ALERT_TYPE);
594 if (s->shutdown & SSL_SENT_SHUTDOWN) { /* but we have not received a
596 s->rwstate = SSL_NOTHING;
597 SSL3_RECORD_set_length(rr, 0);
601 if (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC) {
603 * We can't process a CCS now, because previous handshake messages
604 * are still missing, so just drop it.
606 SSL3_RECORD_set_length(rr, 0);
611 * Unexpected handshake message (Client Hello, or protocol violation)
613 if ((SSL3_RECORD_get_type(rr) == SSL3_RT_HANDSHAKE) &&
614 !ossl_statem_get_in_handshake(s)) {
615 struct hm_header_st msg_hdr;
618 * This may just be a stale retransmit. Also sanity check that we have
619 * at least enough record bytes for a message header
621 if (SSL3_RECORD_get_epoch(rr) != s->rlayer.d->r_epoch
622 || SSL3_RECORD_get_length(rr) < DTLS1_HM_HEADER_LENGTH) {
623 SSL3_RECORD_set_length(rr, 0);
627 dtls1_get_message_header(rr->data, &msg_hdr);
630 * If we are server, we may have a repeated FINISHED of the client
631 * here, then retransmit our CCS and FINISHED.
633 if (msg_hdr.type == SSL3_MT_FINISHED) {
634 if (dtls1_check_timeout_num(s) < 0)
637 dtls1_retransmit_buffered_messages(s);
638 SSL3_RECORD_set_length(rr, 0);
643 * To get here we must be trying to read app data but found handshake
644 * data. But if we're trying to read app data, and we're not in init
645 * (which is tested for at the top of this function) then init must be
648 assert(SSL_is_init_finished(s));
649 if (!SSL_is_init_finished(s)) {
650 al = SSL_AD_INTERNAL_ERROR;
651 SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
655 /* We found handshake data, so we're going back into init */
656 ossl_statem_set_in_init(s, 1);
658 i = s->handshake_func(s);
662 SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE);
666 if (!(s->mode & SSL_MODE_AUTO_RETRY)) {
667 if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) {
668 /* no read-ahead left? */
671 * In the case where we try to read application data, but we
672 * trigger an SSL handshake, we return -1 with the retry
673 * option set. Otherwise renegotiation may cause nasty
674 * problems in the blocking world
676 s->rwstate = SSL_READING;
677 bio = SSL_get_rbio(s);
678 BIO_clear_retry_flags(bio);
679 BIO_set_retry_read(bio);
686 switch (SSL3_RECORD_get_type(rr)) {
688 al = SSL_AD_UNEXPECTED_MESSAGE;
689 SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD);
691 case SSL3_RT_CHANGE_CIPHER_SPEC:
693 case SSL3_RT_HANDSHAKE:
695 * we already handled all of these, with the possible exception of
696 * SSL3_RT_HANDSHAKE when ossl_statem_get_in_handshake(s) is true, but
697 * that should not happen when type != rr->type
699 al = SSL_AD_UNEXPECTED_MESSAGE;
700 SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
702 case SSL3_RT_APPLICATION_DATA:
704 * At this point, we were expecting handshake data, but have
705 * application data. If the library was running inside ssl3_read()
706 * (i.e. in_read_app_data is set) and it makes sense to read
707 * application data at this point (session renegotiation not yet
708 * started), we will indulge it.
710 if (s->s3->in_read_app_data &&
711 (s->s3->total_renegotiations != 0) &&
712 ossl_statem_app_data_allowed(s)) {
713 s->s3->in_read_app_data = 2;
716 al = SSL_AD_UNEXPECTED_MESSAGE;
717 SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD);
724 ssl3_send_alert(s, SSL3_AL_FATAL, al);
729 * Call this to write data in records of type 'type' It will return <= 0 if
730 * not all data has been sent or non-blocking IO.
732 int dtls1_write_bytes(SSL *s, int type, const void *buf, size_t len,
737 if (!ossl_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH))
739 s->rwstate = SSL_NOTHING;
740 i = do_dtls1_write(s, type, buf, len, 0, written);
744 int do_dtls1_write(SSL *s, int type, const unsigned char *buf,
745 size_t len, int create_empty_fragment, size_t *written)
747 unsigned char *p, *pseq;
748 int i, mac_size, clear = 0;
749 size_t prefix_len = 0;
755 wb = &s->rlayer.wbuf[0];
758 * first check if there is a SSL3_BUFFER still being written out. This
759 * will happen with non blocking IO
761 if (!ossl_assert(SSL3_BUFFER_get_left(wb) == 0)) {
762 SSLerr(SSL_F_DO_DTLS1_WRITE, ERR_R_INTERNAL_ERROR);
766 /* If we have an alert to send, lets send it */
767 if (s->s3->alert_dispatch) {
768 i = s->method->ssl_dispatch_alert(s);
771 /* if it went, fall through and send more stuff */
774 if (len == 0 && !create_empty_fragment)
777 if (len > s->max_send_fragment) {
778 SSLerr(SSL_F_DO_DTLS1_WRITE, SSL_R_EXCEEDS_MAX_FRAGMENT_SIZE);
784 if ((sess == NULL) ||
785 (s->enc_write_ctx == NULL) || (EVP_MD_CTX_md(s->write_hash) == NULL))
791 mac_size = EVP_MD_CTX_size(s->write_hash);
796 p = SSL3_BUFFER_get_buf(wb) + prefix_len;
798 /* write the header */
800 *(p++) = type & 0xff;
801 SSL3_RECORD_set_type(&wr, type);
803 * Special case: for hello verify request, client version 1.0 and we
804 * haven't decided which version to use yet send back using version 1.0
805 * header: otherwise some clients will ignore it.
807 if (s->method->version == DTLS_ANY_VERSION &&
808 s->max_proto_version != DTLS1_BAD_VER) {
809 *(p++) = DTLS1_VERSION >> 8;
810 *(p++) = DTLS1_VERSION & 0xff;
812 *(p++) = s->version >> 8;
813 *(p++) = s->version & 0xff;
816 /* field where we are to write out packet epoch, seq num and len */
820 /* Explicit IV length, block ciphers appropriate version flag */
821 if (s->enc_write_ctx) {
822 int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx);
823 if (mode == EVP_CIPH_CBC_MODE) {
824 eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx);
828 /* Need explicit part of IV for GCM mode */
829 else if (mode == EVP_CIPH_GCM_MODE)
830 eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN;
831 else if (mode == EVP_CIPH_CCM_MODE)
832 eivlen = EVP_CCM_TLS_EXPLICIT_IV_LEN;
838 /* lets setup the record stuff. */
839 SSL3_RECORD_set_data(&wr, p + eivlen); /* make room for IV in case of CBC */
840 SSL3_RECORD_set_length(&wr, len);
841 SSL3_RECORD_set_input(&wr, (unsigned char *)buf);
844 * we now 'read' from wr.input, wr.length bytes into wr.data
847 /* first we compress */
848 if (s->compress != NULL) {
849 if (!ssl3_do_compress(s, &wr)) {
850 SSLerr(SSL_F_DO_DTLS1_WRITE, SSL_R_COMPRESSION_FAILURE);
854 memcpy(SSL3_RECORD_get_data(&wr), SSL3_RECORD_get_input(&wr),
855 SSL3_RECORD_get_length(&wr));
856 SSL3_RECORD_reset_input(&wr);
860 * we should still have the output to wr.data and the input from
861 * wr.input. Length should be wr.length. wr.data still points in the
865 if (!SSL_WRITE_ETM(s) && mac_size != 0) {
866 if (!s->method->ssl3_enc->mac(s, &wr,
867 &(p[SSL3_RECORD_get_length(&wr) + eivlen]),
870 SSL3_RECORD_add_length(&wr, mac_size);
873 /* this is true regardless of mac size */
874 SSL3_RECORD_set_data(&wr, p);
875 SSL3_RECORD_reset_input(&wr);
878 SSL3_RECORD_add_length(&wr, eivlen);
880 if (s->method->ssl3_enc->enc(s, &wr, 1, 1) < 1)
883 if (SSL_WRITE_ETM(s) && mac_size != 0) {
884 if (!s->method->ssl3_enc->mac(s, &wr,
885 &(p[SSL3_RECORD_get_length(&wr)]), 1))
887 SSL3_RECORD_add_length(&wr, mac_size);
890 /* record length after mac and block padding */
892 /* there's only one epoch between handshake and app data */
894 s2n(s->rlayer.d->w_epoch, pseq);
896 memcpy(pseq, &(s->rlayer.write_sequence[2]), 6);
898 s2n(SSL3_RECORD_get_length(&wr), pseq);
901 s->msg_callback(1, 0, SSL3_RT_HEADER, pseq - DTLS1_RT_HEADER_LENGTH,
902 DTLS1_RT_HEADER_LENGTH, s, s->msg_callback_arg);
905 * we should now have wr.data pointing to the encrypted data, which is
908 SSL3_RECORD_set_type(&wr, type); /* not needed but helps for debugging */
909 SSL3_RECORD_add_length(&wr, DTLS1_RT_HEADER_LENGTH);
911 ssl3_record_sequence_update(&(s->rlayer.write_sequence[0]));
913 if (create_empty_fragment) {
915 * we are in a recursive call; just return the length, don't write
918 *written = wr.length;
922 /* now let's set up wb */
923 SSL3_BUFFER_set_left(wb, prefix_len + SSL3_RECORD_get_length(&wr));
924 SSL3_BUFFER_set_offset(wb, 0);
927 * memorize arguments so that ssl3_write_pending can detect bad write
930 s->rlayer.wpend_tot = len;
931 s->rlayer.wpend_buf = buf;
932 s->rlayer.wpend_type = type;
933 s->rlayer.wpend_ret = len;
935 /* we now just need to write the buffer */
936 return ssl3_write_pending(s, type, buf, len, written);
941 DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr,
942 unsigned int *is_next_epoch)
947 /* In current epoch, accept HM, CCS, DATA, & ALERT */
948 if (rr->epoch == s->rlayer.d->r_epoch)
949 return &s->rlayer.d->bitmap;
952 * Only HM and ALERT messages can be from the next epoch and only if we
953 * have already processed all of the unprocessed records from the last
956 else if (rr->epoch == (unsigned long)(s->rlayer.d->r_epoch + 1) &&
957 s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch &&
958 (rr->type == SSL3_RT_HANDSHAKE || rr->type == SSL3_RT_ALERT)) {
960 return &s->rlayer.d->next_bitmap;
966 void dtls1_reset_seq_numbers(SSL *s, int rw)
969 unsigned int seq_bytes = sizeof(s->rlayer.read_sequence);
971 if (rw & SSL3_CC_READ) {
972 seq = s->rlayer.read_sequence;
973 s->rlayer.d->r_epoch++;
974 memcpy(&s->rlayer.d->bitmap, &s->rlayer.d->next_bitmap,
975 sizeof(s->rlayer.d->bitmap));
976 memset(&s->rlayer.d->next_bitmap, 0, sizeof(s->rlayer.d->next_bitmap));
979 * We must not use any buffered messages received from the previous
982 dtls1_clear_received_buffer(s);
984 seq = s->rlayer.write_sequence;
985 memcpy(s->rlayer.d->last_write_sequence, seq,
986 sizeof(s->rlayer.write_sequence));
987 s->rlayer.d->w_epoch++;
990 memset(seq, 0, seq_bytes);