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-rw-r--r--src/lib/libssl/d1_pkt.c1163
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diff --git a/src/lib/libssl/d1_pkt.c b/src/lib/libssl/d1_pkt.c
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1/* $OpenBSD: d1_pkt.c,v 1.105 2021/07/31 09:31:04 jsing Exp $ */
2/*
3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
5 */
6/* ====================================================================
7 * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
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
19 * distribution.
20 *
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/)"
25 *
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.
30 *
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.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 * acknowledgment:
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
39 *
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 * ====================================================================
53 *
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).
57 *
58 */
59/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60 * All rights reserved.
61 *
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.
65 *
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).
72 *
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.
79 *
80 * Redistribution and use in source and binary forms, with or without
81 * modification, are permitted provided that the following conditions
82 * are met:
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)"
97 *
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
108 * SUCH DAMAGE.
109 *
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.]
114 */
115
116#include <machine/endian.h>
117
118#include <errno.h>
119#include <stdio.h>
120
121#include <openssl/buffer.h>
122#include <openssl/evp.h>
123
124#include "bytestring.h"
125#include "dtls_locl.h"
126#include "pqueue.h"
127#include "ssl_locl.h"
128
129/* mod 128 saturating subtract of two 64-bit values in big-endian order */
130static int
131satsub64be(const unsigned char *v1, const unsigned char *v2)
132{
133 int ret, sat, brw, i;
134
135 if (sizeof(long) == 8)
136 do {
137 long l;
138
139 if (BYTE_ORDER == LITTLE_ENDIAN)
140 break;
141 /* not reached on little-endians */
142 /* following test is redundant, because input is
143 * always aligned, but I take no chances... */
144 if (((size_t)v1 | (size_t)v2) & 0x7)
145 break;
146
147 l = *((long *)v1);
148 l -= *((long *)v2);
149 if (l > 128)
150 return 128;
151 else if (l<-128)
152 return -128;
153 else
154 return (int)l;
155 } while (0);
156
157 ret = (int)v1[7] - (int)v2[7];
158 sat = 0;
159 brw = ret >> 8; /* brw is either 0 or -1 */
160 if (ret & 0x80) {
161 for (i = 6; i >= 0; i--) {
162 brw += (int)v1[i]-(int)v2[i];
163 sat |= ~brw;
164 brw >>= 8;
165 }
166 } else {
167 for (i = 6; i >= 0; i--) {
168 brw += (int)v1[i]-(int)v2[i];
169 sat |= brw;
170 brw >>= 8;
171 }
172 }
173 brw <<= 8; /* brw is either 0 or -256 */
174
175 if (sat & 0xff)
176 return brw | 0x80;
177 else
178 return brw + (ret & 0xFF);
179}
180
181static int have_handshake_fragment(SSL *s, int type, unsigned char *buf,
182 int len, int peek);
183static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap,
184 const unsigned char *seq);
185static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap,
186 const unsigned char *seq);
187static DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD_INTERNAL *rr,
188 unsigned int *is_next_epoch);
189static int dtls1_buffer_record(SSL *s, record_pqueue *q,
190 unsigned char *priority);
191static int dtls1_process_record(SSL *s);
192
193/* copy buffered record into SSL structure */
194static int
195dtls1_copy_record(SSL *s, DTLS1_RECORD_DATA_INTERNAL *rdata)
196{
197 ssl3_release_buffer(&S3I(s)->rbuf);
198
199 s->internal->packet = rdata->packet;
200 s->internal->packet_length = rdata->packet_length;
201 memcpy(&(S3I(s)->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER_INTERNAL));
202 memcpy(&(S3I(s)->rrec), &(rdata->rrec), sizeof(SSL3_RECORD_INTERNAL));
203
204 return (1);
205}
206
207static int
208dtls1_buffer_record(SSL *s, record_pqueue *queue, unsigned char *priority)
209{
210 DTLS1_RECORD_DATA_INTERNAL *rdata;
211 pitem *item;
212
213 /* Limit the size of the queue to prevent DOS attacks */
214 if (pqueue_size(queue->q) >= 100)
215 return 0;
216
217 rdata = malloc(sizeof(DTLS1_RECORD_DATA_INTERNAL));
218 item = pitem_new(priority, rdata);
219 if (rdata == NULL || item == NULL)
220 goto init_err;
221
222 rdata->packet = s->internal->packet;
223 rdata->packet_length = s->internal->packet_length;
224 memcpy(&(rdata->rbuf), &(S3I(s)->rbuf), sizeof(SSL3_BUFFER_INTERNAL));
225 memcpy(&(rdata->rrec), &(S3I(s)->rrec), sizeof(SSL3_RECORD_INTERNAL));
226
227 item->data = rdata;
228
229 s->internal->packet = NULL;
230 s->internal->packet_length = 0;
231 memset(&(S3I(s)->rbuf), 0, sizeof(SSL3_BUFFER_INTERNAL));
232 memset(&(S3I(s)->rrec), 0, sizeof(SSL3_RECORD_INTERNAL));
233
234 if (!ssl3_setup_buffers(s))
235 goto err;
236
237 /* insert should not fail, since duplicates are dropped */
238 if (pqueue_insert(queue->q, item) == NULL)
239 goto err;
240
241 return (1);
242
243 err:
244 ssl3_release_buffer(&rdata->rbuf);
245
246 init_err:
247 SSLerror(s, ERR_R_INTERNAL_ERROR);
248 free(rdata);
249 pitem_free(item);
250 return (-1);
251}
252
253
254static int
255dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue)
256{
257 pitem *item;
258
259 item = pqueue_pop(queue->q);
260 if (item) {
261 dtls1_copy_record(s, item->data);
262
263 free(item->data);
264 pitem_free(item);
265
266 return (1);
267 }
268
269 return (0);
270}
271
272static int
273dtls1_process_buffered_record(SSL *s)
274{
275 /* Check if epoch is current. */
276 if (D1I(s)->unprocessed_rcds.epoch != D1I(s)->r_epoch)
277 return (0);
278
279 /* Update epoch once all unprocessed records have been processed. */
280 if (pqueue_peek(D1I(s)->unprocessed_rcds.q) == NULL) {
281 D1I(s)->unprocessed_rcds.epoch = D1I(s)->r_epoch + 1;
282 return (0);
283 }
284
285 /* Process one of the records. */
286 if (!dtls1_retrieve_buffered_record(s, &D1I(s)->unprocessed_rcds))
287 return (-1);
288 if (!dtls1_process_record(s))
289 return (-1);
290
291 return (1);
292}
293
294static int
295dtls1_process_record(SSL *s)
296{
297 SSL3_RECORD_INTERNAL *rr = &(S3I(s)->rrec);
298 uint8_t alert_desc;
299 uint8_t *out;
300 size_t out_len;
301
302 tls12_record_layer_set_version(s->internal->rl, s->version);
303
304 if (!tls12_record_layer_open_record(s->internal->rl, s->internal->packet,
305 s->internal->packet_length, &out, &out_len)) {
306 tls12_record_layer_alert(s->internal->rl, &alert_desc);
307
308 if (alert_desc == 0)
309 goto err;
310
311 /*
312 * DTLS should silently discard invalid records, including those
313 * with a bad MAC, as per RFC 6347 section 4.1.2.1.
314 */
315 if (alert_desc == SSL_AD_BAD_RECORD_MAC) {
316 out_len = 0;
317 goto done;
318 }
319
320 if (alert_desc == SSL_AD_RECORD_OVERFLOW)
321 SSLerror(s, SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
322
323 goto fatal_err;
324 }
325
326 done:
327 rr->data = out;
328 rr->length = out_len;
329 rr->off = 0;
330
331 s->internal->packet_length = 0;
332
333 return (1);
334
335 fatal_err:
336 ssl3_send_alert(s, SSL3_AL_FATAL, alert_desc);
337 err:
338 return (0);
339}
340
341/* Call this to get a new input record.
342 * It will return <= 0 if more data is needed, normally due to an error
343 * or non-blocking IO.
344 * When it finishes, one packet has been decoded and can be found in
345 * ssl->s3->internal->rrec.type - is the type of record
346 * ssl->s3->internal->rrec.data, - data
347 * ssl->s3->internal->rrec.length, - number of bytes
348 */
349/* used only by dtls1_read_bytes */
350int
351dtls1_get_record(SSL *s)
352{
353 SSL3_RECORD_INTERNAL *rr = &(S3I(s)->rrec);
354 unsigned char *p = NULL;
355 DTLS1_BITMAP *bitmap;
356 unsigned int is_next_epoch;
357 int ret, n;
358
359 /* See if there are pending records that can now be processed. */
360 if ((ret = dtls1_process_buffered_record(s)) != 0)
361 return (ret);
362
363 /* get something from the wire */
364 if (0) {
365 again:
366 /* dump this record on all retries */
367 rr->length = 0;
368 s->internal->packet_length = 0;
369 }
370
371 /* check if we have the header */
372 if ((s->internal->rstate != SSL_ST_READ_BODY) ||
373 (s->internal->packet_length < DTLS1_RT_HEADER_LENGTH)) {
374 CBS header, seq_no;
375 uint16_t epoch, len, ssl_version;
376 uint8_t type;
377
378 n = ssl3_packet_read(s, DTLS1_RT_HEADER_LENGTH);
379 if (n <= 0)
380 return (n);
381
382 /* If this packet contained a partial record, dump it. */
383 if (n != DTLS1_RT_HEADER_LENGTH)
384 goto again;
385
386 s->internal->rstate = SSL_ST_READ_BODY;
387
388 CBS_init(&header, s->internal->packet, s->internal->packet_length);
389
390 /* Pull apart the header into the DTLS1_RECORD */
391 if (!CBS_get_u8(&header, &type))
392 goto again;
393 if (!CBS_get_u16(&header, &ssl_version))
394 goto again;
395
396 /* sequence number is 64 bits, with top 2 bytes = epoch */
397 if (!CBS_get_u16(&header, &epoch) ||
398 !CBS_get_bytes(&header, &seq_no, 6))
399 goto again;
400
401 if (!CBS_get_u16(&header, &len))
402 goto again;
403
404 if (!CBS_write_bytes(&seq_no, &rr->seq_num[2],
405 sizeof(rr->seq_num) - 2, NULL))
406 goto again;
407
408 rr->type = type;
409 rr->epoch = epoch;
410 rr->length = len;
411
412 /* unexpected version, silently discard */
413 if (!s->internal->first_packet && ssl_version != s->version)
414 goto again;
415
416 /* wrong version, silently discard record */
417 if ((ssl_version & 0xff00) != (s->version & 0xff00))
418 goto again;
419
420 /* record too long, silently discard it */
421 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
422 goto again;
423
424 /* now s->internal->rstate == SSL_ST_READ_BODY */
425 p = (unsigned char *)CBS_data(&header);
426 }
427
428 /* s->internal->rstate == SSL_ST_READ_BODY, get and decode the data */
429
430 n = ssl3_packet_extend(s, DTLS1_RT_HEADER_LENGTH + rr->length);
431 if (n <= 0)
432 return (n);
433
434 /* If this packet contained a partial record, dump it. */
435 if (n != DTLS1_RT_HEADER_LENGTH + rr->length)
436 goto again;
437
438 s->internal->rstate = SSL_ST_READ_HEADER; /* set state for later operations */
439
440 /* match epochs. NULL means the packet is dropped on the floor */
441 bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch);
442 if (bitmap == NULL)
443 goto again;
444
445 /*
446 * Check whether this is a repeat, or aged record.
447 * Don't check if we're listening and this message is
448 * a ClientHello. They can look as if they're replayed,
449 * since they arrive from different connections and
450 * would be dropped unnecessarily.
451 */
452 if (!(D1I(s)->listen && rr->type == SSL3_RT_HANDSHAKE &&
453 p != NULL && *p == SSL3_MT_CLIENT_HELLO) &&
454 !dtls1_record_replay_check(s, bitmap, rr->seq_num))
455 goto again;
456
457 /* just read a 0 length packet */
458 if (rr->length == 0)
459 goto again;
460
461 /* If this record is from the next epoch (either HM or ALERT),
462 * and a handshake is currently in progress, buffer it since it
463 * cannot be processed at this time. However, do not buffer
464 * anything while listening.
465 */
466 if (is_next_epoch) {
467 if ((SSL_in_init(s) || s->internal->in_handshake) && !D1I(s)->listen) {
468 if (dtls1_buffer_record(s, &(D1I(s)->unprocessed_rcds),
469 rr->seq_num) < 0)
470 return (-1);
471 /* Mark receipt of record. */
472 dtls1_record_bitmap_update(s, bitmap, rr->seq_num);
473 }
474 goto again;
475 }
476
477 if (!dtls1_process_record(s))
478 goto again;
479
480 /* Mark receipt of record. */
481 dtls1_record_bitmap_update(s, bitmap, rr->seq_num);
482
483 return (1);
484}
485
486/* Return up to 'len' payload bytes received in 'type' records.
487 * 'type' is one of the following:
488 *
489 * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
490 * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
491 * - 0 (during a shutdown, no data has to be returned)
492 *
493 * If we don't have stored data to work from, read a SSL/TLS record first
494 * (possibly multiple records if we still don't have anything to return).
495 *
496 * This function must handle any surprises the peer may have for us, such as
497 * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
498 * a surprise, but handled as if it were), or renegotiation requests.
499 * Also if record payloads contain fragments too small to process, we store
500 * them until there is enough for the respective protocol (the record protocol
501 * may use arbitrary fragmentation and even interleaving):
502 * Change cipher spec protocol
503 * just 1 byte needed, no need for keeping anything stored
504 * Alert protocol
505 * 2 bytes needed (AlertLevel, AlertDescription)
506 * Handshake protocol
507 * 4 bytes needed (HandshakeType, uint24 length) -- we just have
508 * to detect unexpected Client Hello and Hello Request messages
509 * here, anything else is handled by higher layers
510 * Application data protocol
511 * none of our business
512 */
513int
514dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
515{
516 int al, i, j, ret;
517 unsigned int n;
518 SSL3_RECORD_INTERNAL *rr;
519 void (*cb)(const SSL *ssl, int type2, int val) = NULL;
520
521 if (S3I(s)->rbuf.buf == NULL) /* Not initialized yet */
522 if (!ssl3_setup_buffers(s))
523 return (-1);
524
525 if ((type &&
526 type != SSL3_RT_APPLICATION_DATA && type != SSL3_RT_HANDSHAKE) ||
527 (peek && (type != SSL3_RT_APPLICATION_DATA))) {
528 SSLerror(s, ERR_R_INTERNAL_ERROR);
529 return -1;
530 }
531
532 /* check whether there's a handshake message (client hello?) waiting */
533 if ((ret = have_handshake_fragment(s, type, buf, len, peek)))
534 return ret;
535
536 /* Now D1I(s)->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
537
538 if (!s->internal->in_handshake && SSL_in_init(s))
539 {
540 /* type == SSL3_RT_APPLICATION_DATA */
541 i = s->internal->handshake_func(s);
542 if (i < 0)
543 return (i);
544 if (i == 0) {
545 SSLerror(s, SSL_R_SSL_HANDSHAKE_FAILURE);
546 return (-1);
547 }
548 }
549
550 start:
551 s->internal->rwstate = SSL_NOTHING;
552
553 /* S3I(s)->rrec.type - is the type of record
554 * S3I(s)->rrec.data, - data
555 * S3I(s)->rrec.off, - offset into 'data' for next read
556 * S3I(s)->rrec.length, - number of bytes. */
557 rr = &(S3I(s)->rrec);
558
559 /* We are not handshaking and have no data yet,
560 * so process data buffered during the last handshake
561 * in advance, if any.
562 */
563 if (S3I(s)->hs.state == SSL_ST_OK && rr->length == 0)
564 dtls1_retrieve_buffered_record(s, &(D1I(s)->buffered_app_data));
565
566 /* Check for timeout */
567 if (dtls1_handle_timeout(s) > 0)
568 goto start;
569
570 /* get new packet if necessary */
571 if ((rr->length == 0) || (s->internal->rstate == SSL_ST_READ_BODY)) {
572 ret = dtls1_get_record(s);
573 if (ret <= 0) {
574 ret = dtls1_read_failed(s, ret);
575 /* anything other than a timeout is an error */
576 if (ret <= 0)
577 return (ret);
578 else
579 goto start;
580 }
581 }
582
583 if (D1I(s)->listen && rr->type != SSL3_RT_HANDSHAKE) {
584 rr->length = 0;
585 goto start;
586 }
587
588 /* we now have a packet which can be read and processed */
589
590 if (S3I(s)->change_cipher_spec /* set when we receive ChangeCipherSpec,
591 * reset by ssl3_get_finished */
592 && (rr->type != SSL3_RT_HANDSHAKE)) {
593 /* We now have application data between CCS and Finished.
594 * Most likely the packets were reordered on their way, so
595 * buffer the application data for later processing rather
596 * than dropping the connection.
597 */
598 if (dtls1_buffer_record(s, &(D1I(s)->buffered_app_data),
599 rr->seq_num) < 0) {
600 SSLerror(s, ERR_R_INTERNAL_ERROR);
601 return (-1);
602 }
603 rr->length = 0;
604 goto start;
605 }
606
607 /* If the other end has shut down, throw anything we read away
608 * (even in 'peek' mode) */
609 if (s->internal->shutdown & SSL_RECEIVED_SHUTDOWN) {
610 rr->length = 0;
611 s->internal->rwstate = SSL_NOTHING;
612 return (0);
613 }
614
615 /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
616 if (type == rr->type) {
617 /* make sure that we are not getting application data when we
618 * are doing a handshake for the first time */
619 if (SSL_in_init(s) && type == SSL3_RT_APPLICATION_DATA &&
620 !tls12_record_layer_read_protected(s->internal->rl)) {
621 al = SSL_AD_UNEXPECTED_MESSAGE;
622 SSLerror(s, SSL_R_APP_DATA_IN_HANDSHAKE);
623 goto fatal_err;
624 }
625
626 if (len <= 0)
627 return (len);
628
629 if ((unsigned int)len > rr->length)
630 n = rr->length;
631 else
632 n = (unsigned int)len;
633
634 memcpy(buf, &(rr->data[rr->off]), n);
635 if (!peek) {
636 rr->length -= n;
637 rr->off += n;
638 if (rr->length == 0) {
639 s->internal->rstate = SSL_ST_READ_HEADER;
640 rr->off = 0;
641 }
642 }
643
644 return (n);
645 }
646
647
648 /* If we get here, then type != rr->type; if we have a handshake
649 * message, then it was unexpected (Hello Request or Client Hello). */
650
651 /* In case of record types for which we have 'fragment' storage,
652 * fill that so that we can process the data at a fixed place.
653 */
654 {
655 unsigned int k, dest_maxlen = 0;
656 unsigned char *dest = NULL;
657 unsigned int *dest_len = NULL;
658
659 if (rr->type == SSL3_RT_HANDSHAKE) {
660 dest_maxlen = sizeof D1I(s)->handshake_fragment;
661 dest = D1I(s)->handshake_fragment;
662 dest_len = &D1I(s)->handshake_fragment_len;
663 } else if (rr->type == SSL3_RT_ALERT) {
664 dest_maxlen = sizeof(D1I(s)->alert_fragment);
665 dest = D1I(s)->alert_fragment;
666 dest_len = &D1I(s)->alert_fragment_len;
667 }
668 /* else it's a CCS message, or application data or wrong */
669 else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC) {
670 /* Application data while renegotiating
671 * is allowed. Try again reading.
672 */
673 if (rr->type == SSL3_RT_APPLICATION_DATA) {
674 BIO *bio;
675 S3I(s)->in_read_app_data = 2;
676 bio = SSL_get_rbio(s);
677 s->internal->rwstate = SSL_READING;
678 BIO_clear_retry_flags(bio);
679 BIO_set_retry_read(bio);
680 return (-1);
681 }
682
683 /* Not certain if this is the right error handling */
684 al = SSL_AD_UNEXPECTED_MESSAGE;
685 SSLerror(s, SSL_R_UNEXPECTED_RECORD);
686 goto fatal_err;
687 }
688
689 if (dest_maxlen > 0) {
690 /* XDTLS: In a pathalogical case, the Client Hello
691 * may be fragmented--don't always expect dest_maxlen bytes */
692 if (rr->length < dest_maxlen) {
693 s->internal->rstate = SSL_ST_READ_HEADER;
694 rr->length = 0;
695 goto start;
696 }
697
698 /* now move 'n' bytes: */
699 for ( k = 0; k < dest_maxlen; k++) {
700 dest[k] = rr->data[rr->off++];
701 rr->length--;
702 }
703 *dest_len = dest_maxlen;
704 }
705 }
706
707 /* D1I(s)->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE;
708 * D1I(s)->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT.
709 * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
710
711 /* If we are a client, check for an incoming 'Hello Request': */
712 if ((!s->server) &&
713 (D1I(s)->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
714 (D1I(s)->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
715 (s->session != NULL) && (s->session->cipher != NULL)) {
716 D1I(s)->handshake_fragment_len = 0;
717
718 if ((D1I(s)->handshake_fragment[1] != 0) ||
719 (D1I(s)->handshake_fragment[2] != 0) ||
720 (D1I(s)->handshake_fragment[3] != 0)) {
721 al = SSL_AD_DECODE_ERROR;
722 SSLerror(s, SSL_R_BAD_HELLO_REQUEST);
723 goto fatal_err;
724 }
725
726 /* no need to check sequence number on HELLO REQUEST messages */
727
728 if (s->internal->msg_callback)
729 s->internal->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
730 D1I(s)->handshake_fragment, 4, s, s->internal->msg_callback_arg);
731
732 if (SSL_is_init_finished(s) &&
733 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
734 !S3I(s)->renegotiate) {
735 D1I(s)->handshake_read_seq++;
736 s->internal->new_session = 1;
737 ssl3_renegotiate(s);
738 if (ssl3_renegotiate_check(s)) {
739 i = s->internal->handshake_func(s);
740 if (i < 0)
741 return (i);
742 if (i == 0) {
743 SSLerror(s, SSL_R_SSL_HANDSHAKE_FAILURE);
744 return (-1);
745 }
746
747 if (!(s->internal->mode & SSL_MODE_AUTO_RETRY)) {
748 if (S3I(s)->rbuf.left == 0) /* no read-ahead left? */
749 {
750 BIO *bio;
751 /* In the case where we try to read application data,
752 * but we trigger an SSL handshake, we return -1 with
753 * the retry option set. Otherwise renegotiation may
754 * cause nasty problems in the blocking world */
755 s->internal->rwstate = SSL_READING;
756 bio = SSL_get_rbio(s);
757 BIO_clear_retry_flags(bio);
758 BIO_set_retry_read(bio);
759 return (-1);
760 }
761 }
762 }
763 }
764 /* we either finished a handshake or ignored the request,
765 * now try again to obtain the (application) data we were asked for */
766 goto start;
767 }
768
769 if (D1I(s)->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH) {
770 int alert_level = D1I(s)->alert_fragment[0];
771 int alert_descr = D1I(s)->alert_fragment[1];
772
773 D1I(s)->alert_fragment_len = 0;
774
775 if (s->internal->msg_callback)
776 s->internal->msg_callback(0, s->version, SSL3_RT_ALERT,
777 D1I(s)->alert_fragment, 2, s, s->internal->msg_callback_arg);
778
779 if (s->internal->info_callback != NULL)
780 cb = s->internal->info_callback;
781 else if (s->ctx->internal->info_callback != NULL)
782 cb = s->ctx->internal->info_callback;
783
784 if (cb != NULL) {
785 j = (alert_level << 8) | alert_descr;
786 cb(s, SSL_CB_READ_ALERT, j);
787 }
788
789 if (alert_level == SSL3_AL_WARNING) {
790 S3I(s)->warn_alert = alert_descr;
791 if (alert_descr == SSL_AD_CLOSE_NOTIFY) {
792 s->internal->shutdown |= SSL_RECEIVED_SHUTDOWN;
793 return (0);
794 }
795 } else if (alert_level == SSL3_AL_FATAL) {
796 s->internal->rwstate = SSL_NOTHING;
797 S3I(s)->fatal_alert = alert_descr;
798 SSLerror(s, SSL_AD_REASON_OFFSET + alert_descr);
799 ERR_asprintf_error_data("SSL alert number %d",
800 alert_descr);
801 s->internal->shutdown|=SSL_RECEIVED_SHUTDOWN;
802 SSL_CTX_remove_session(s->ctx, s->session);
803 return (0);
804 } else {
805 al = SSL_AD_ILLEGAL_PARAMETER;
806 SSLerror(s, SSL_R_UNKNOWN_ALERT_TYPE);
807 goto fatal_err;
808 }
809
810 goto start;
811 }
812
813 if (s->internal->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
814 {
815 s->internal->rwstate = SSL_NOTHING;
816 rr->length = 0;
817 return (0);
818 }
819
820 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC) {
821 /* 'Change Cipher Spec' is just a single byte, so we know
822 * exactly what the record payload has to look like */
823 /* XDTLS: check that epoch is consistent */
824 if ((rr->length != DTLS1_CCS_HEADER_LENGTH) ||
825 (rr->off != 0) || (rr->data[0] != SSL3_MT_CCS)) {
826 al = SSL_AD_DECODE_ERROR;
827 SSLerror(s, SSL_R_BAD_CHANGE_CIPHER_SPEC);
828 goto fatal_err;
829 }
830
831 rr->length = 0;
832
833 if (s->internal->msg_callback)
834 s->internal->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,
835 rr->data, 1, s, s->internal->msg_callback_arg);
836
837 /* We can't process a CCS now, because previous handshake
838 * messages are still missing, so just drop it.
839 */
840 if (!D1I(s)->change_cipher_spec_ok) {
841 goto start;
842 }
843
844 D1I(s)->change_cipher_spec_ok = 0;
845
846 S3I(s)->change_cipher_spec = 1;
847 if (!ssl3_do_change_cipher_spec(s))
848 goto err;
849
850 goto start;
851 }
852
853 /* Unexpected handshake message (Client Hello, or protocol violation) */
854 if ((D1I(s)->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
855 !s->internal->in_handshake) {
856 struct hm_header_st msg_hdr;
857
858 /* this may just be a stale retransmit */
859 if (!dtls1_get_message_header(rr->data, &msg_hdr))
860 return -1;
861 if (rr->epoch != D1I(s)->r_epoch) {
862 rr->length = 0;
863 goto start;
864 }
865
866 /* If we are server, we may have a repeated FINISHED of the
867 * client here, then retransmit our CCS and FINISHED.
868 */
869 if (msg_hdr.type == SSL3_MT_FINISHED) {
870 if (dtls1_check_timeout_num(s) < 0)
871 return -1;
872
873 dtls1_retransmit_buffered_messages(s);
874 rr->length = 0;
875 goto start;
876 }
877
878 if (((S3I(s)->hs.state&SSL_ST_MASK) == SSL_ST_OK) &&
879 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) {
880 S3I(s)->hs.state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
881 s->internal->renegotiate = 1;
882 s->internal->new_session = 1;
883 }
884 i = s->internal->handshake_func(s);
885 if (i < 0)
886 return (i);
887 if (i == 0) {
888 SSLerror(s, SSL_R_SSL_HANDSHAKE_FAILURE);
889 return (-1);
890 }
891
892 if (!(s->internal->mode & SSL_MODE_AUTO_RETRY)) {
893 if (S3I(s)->rbuf.left == 0) /* no read-ahead left? */
894 {
895 BIO *bio;
896 /* In the case where we try to read application data,
897 * but we trigger an SSL handshake, we return -1 with
898 * the retry option set. Otherwise renegotiation may
899 * cause nasty problems in the blocking world */
900 s->internal->rwstate = SSL_READING;
901 bio = SSL_get_rbio(s);
902 BIO_clear_retry_flags(bio);
903 BIO_set_retry_read(bio);
904 return (-1);
905 }
906 }
907 goto start;
908 }
909
910 switch (rr->type) {
911 default:
912 /* TLS just ignores unknown message types */
913 if (s->version == TLS1_VERSION) {
914 rr->length = 0;
915 goto start;
916 }
917 al = SSL_AD_UNEXPECTED_MESSAGE;
918 SSLerror(s, SSL_R_UNEXPECTED_RECORD);
919 goto fatal_err;
920 case SSL3_RT_CHANGE_CIPHER_SPEC:
921 case SSL3_RT_ALERT:
922 case SSL3_RT_HANDSHAKE:
923 /* we already handled all of these, with the possible exception
924 * of SSL3_RT_HANDSHAKE when s->internal->in_handshake is set, but that
925 * should not happen when type != rr->type */
926 al = SSL_AD_UNEXPECTED_MESSAGE;
927 SSLerror(s, ERR_R_INTERNAL_ERROR);
928 goto fatal_err;
929 case SSL3_RT_APPLICATION_DATA:
930 /* At this point, we were expecting handshake data,
931 * but have application data. If the library was
932 * running inside ssl3_read() (i.e. in_read_app_data
933 * is set) and it makes sense to read application data
934 * at this point (session renegotiation not yet started),
935 * we will indulge it.
936 */
937 if (S3I(s)->in_read_app_data &&
938 (S3I(s)->total_renegotiations != 0) &&
939 (((S3I(s)->hs.state & SSL_ST_CONNECT) &&
940 (S3I(s)->hs.state >= SSL3_ST_CW_CLNT_HELLO_A) &&
941 (S3I(s)->hs.state <= SSL3_ST_CR_SRVR_HELLO_A)) || (
942 (S3I(s)->hs.state & SSL_ST_ACCEPT) &&
943 (S3I(s)->hs.state <= SSL3_ST_SW_HELLO_REQ_A) &&
944 (S3I(s)->hs.state >= SSL3_ST_SR_CLNT_HELLO_A)))) {
945 S3I(s)->in_read_app_data = 2;
946 return (-1);
947 } else {
948 al = SSL_AD_UNEXPECTED_MESSAGE;
949 SSLerror(s, SSL_R_UNEXPECTED_RECORD);
950 goto fatal_err;
951 }
952 }
953 /* not reached */
954
955 fatal_err:
956 ssl3_send_alert(s, SSL3_AL_FATAL, al);
957 err:
958 return (-1);
959}
960
961int
962dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len)
963{
964 int i;
965
966 if (SSL_in_init(s) && !s->internal->in_handshake)
967 {
968 i = s->internal->handshake_func(s);
969 if (i < 0)
970 return (i);
971 if (i == 0) {
972 SSLerror(s, SSL_R_SSL_HANDSHAKE_FAILURE);
973 return -1;
974 }
975 }
976
977 if (len > SSL3_RT_MAX_PLAIN_LENGTH) {
978 SSLerror(s, SSL_R_DTLS_MESSAGE_TOO_BIG);
979 return -1;
980 }
981
982 i = dtls1_write_bytes(s, type, buf_, len);
983 return i;
984}
985
986
987 /* this only happens when a client hello is received and a handshake
988 * is started. */
989static int
990have_handshake_fragment(SSL *s, int type, unsigned char *buf,
991 int len, int peek)
992{
993
994 if ((type == SSL3_RT_HANDSHAKE) && (D1I(s)->handshake_fragment_len > 0))
995 /* (partially) satisfy request from storage */
996 {
997 unsigned char *src = D1I(s)->handshake_fragment;
998 unsigned char *dst = buf;
999 unsigned int k, n;
1000
1001 /* peek == 0 */
1002 n = 0;
1003 while ((len > 0) && (D1I(s)->handshake_fragment_len > 0)) {
1004 *dst++ = *src++;
1005 len--;
1006 D1I(s)->handshake_fragment_len--;
1007 n++;
1008 }
1009 /* move any remaining fragment bytes: */
1010 for (k = 0; k < D1I(s)->handshake_fragment_len; k++)
1011 D1I(s)->handshake_fragment[k] = *src++;
1012 return n;
1013 }
1014
1015 return 0;
1016}
1017
1018
1019/* Call this to write data in records of type 'type'
1020 * It will return <= 0 if not all data has been sent or non-blocking IO.
1021 */
1022int
1023dtls1_write_bytes(SSL *s, int type, const void *buf, int len)
1024{
1025 int i;
1026
1027 OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH);
1028 s->internal->rwstate = SSL_NOTHING;
1029 i = do_dtls1_write(s, type, buf, len);
1030 return i;
1031}
1032
1033int
1034do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len)
1035{
1036 SSL3_BUFFER_INTERNAL *wb = &(S3I(s)->wbuf);
1037 size_t out_len;
1038 CBB cbb;
1039 int ret;
1040
1041 memset(&cbb, 0, sizeof(cbb));
1042
1043 /*
1044 * First check if there is a SSL3_BUFFER_INTERNAL still being written
1045 * out. This will happen with non blocking IO.
1046 */
1047 if (wb->left != 0) {
1048 OPENSSL_assert(0); /* XDTLS: want to see if we ever get here */
1049 return (ssl3_write_pending(s, type, buf, len));
1050 }
1051
1052 /* If we have an alert to send, let's send it */
1053 if (S3I(s)->alert_dispatch) {
1054 if ((ret = ssl3_dispatch_alert(s)) <= 0)
1055 return (ret);
1056 /* If it went, fall through and send more stuff. */
1057 }
1058
1059 if (len == 0)
1060 return 0;
1061
1062 wb->offset = 0;
1063
1064 if (!CBB_init_fixed(&cbb, wb->buf, wb->len))
1065 goto err;
1066
1067 tls12_record_layer_set_version(s->internal->rl, s->version);
1068
1069 if (!tls12_record_layer_seal_record(s->internal->rl, type, buf, len, &cbb))
1070 goto err;
1071
1072 if (!CBB_finish(&cbb, NULL, &out_len))
1073 goto err;
1074
1075 wb->left = out_len;
1076
1077 /*
1078 * Memorize arguments so that ssl3_write_pending can detect
1079 * bad write retries later.
1080 */
1081 S3I(s)->wpend_tot = len;
1082 S3I(s)->wpend_buf = buf;
1083 S3I(s)->wpend_type = type;
1084 S3I(s)->wpend_ret = len;
1085
1086 /* We now just need to write the buffer. */
1087 return ssl3_write_pending(s, type, buf, len);
1088
1089 err:
1090 CBB_cleanup(&cbb);
1091
1092 return -1;
1093}
1094
1095static int
1096dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap,
1097 const unsigned char *seq)
1098{
1099 unsigned int shift;
1100 int cmp;
1101
1102 cmp = satsub64be(seq, bitmap->max_seq_num);
1103 if (cmp > 0)
1104 return 1; /* this record in new */
1105 shift = -cmp;
1106 if (shift >= sizeof(bitmap->map)*8)
1107 return 0; /* stale, outside the window */
1108 else if (bitmap->map & (1UL << shift))
1109 return 0; /* record previously received */
1110
1111 return 1;
1112}
1113
1114static void
1115dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap,
1116 const unsigned char *seq)
1117{
1118 unsigned int shift;
1119 int cmp;
1120
1121 cmp = satsub64be(seq, bitmap->max_seq_num);
1122 if (cmp > 0) {
1123 shift = cmp;
1124 if (shift < sizeof(bitmap->map)*8)
1125 bitmap->map <<= shift, bitmap->map |= 1UL;
1126 else
1127 bitmap->map = 1UL;
1128 memcpy(bitmap->max_seq_num, seq, 8);
1129 } else {
1130 shift = -cmp;
1131 if (shift < sizeof(bitmap->map) * 8)
1132 bitmap->map |= 1UL << shift;
1133 }
1134}
1135
1136static DTLS1_BITMAP *
1137dtls1_get_bitmap(SSL *s, SSL3_RECORD_INTERNAL *rr, unsigned int *is_next_epoch)
1138{
1139 uint16_t next_epoch = D1I(s)->r_epoch + 1;
1140
1141 *is_next_epoch = 0;
1142
1143 /* In current epoch, accept HM, CCS, DATA, & ALERT */
1144 if (rr->epoch == D1I(s)->r_epoch)
1145 return &D1I(s)->bitmap;
1146
1147 /* Only HM and ALERT messages can be from the next epoch */
1148 else if (rr->epoch == next_epoch &&
1149 (rr->type == SSL3_RT_HANDSHAKE || rr->type == SSL3_RT_ALERT)) {
1150 *is_next_epoch = 1;
1151 return &D1I(s)->next_bitmap;
1152 }
1153
1154 return NULL;
1155}
1156
1157void
1158dtls1_reset_read_seq_numbers(SSL *s)
1159{
1160 D1I(s)->r_epoch++;
1161 memcpy(&(D1I(s)->bitmap), &(D1I(s)->next_bitmap), sizeof(DTLS1_BITMAP));
1162 memset(&(D1I(s)->next_bitmap), 0, sizeof(DTLS1_BITMAP));
1163}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2026-02-12 15:44:10 +0000