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authorcvs2svn <admin@example.com>2021-08-18 16:06:57 +0000
committercvs2svn <admin@example.com>2021-08-18 16:06:57 +0000
commitd56c8fa8260d226f98b26f017b45b9c2b135f38d (patch)
tree348178b41617813cc93787187984a734ef8379ca /src/lib/libssl/d1_both.c
parent18b9c1bcab7c37d8c5bd05b8e0d14d0c59d96650 (diff)
downloadopenbsd-tb_20210818.tar.gz
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This commit was manufactured by cvs2git to create tag 'tb_20210818'.tb_20210818
Diffstat (limited to 'src/lib/libssl/d1_both.c')
-rw-r--r--src/lib/libssl/d1_both.c1204
1 files changed, 0 insertions, 1204 deletions
diff --git a/src/lib/libssl/d1_both.c b/src/lib/libssl/d1_both.c
deleted file mode 100644
index 61dc47b4b7..0000000000
--- a/src/lib/libssl/d1_both.c
+++ /dev/null
@@ -1,1204 +0,0 @@
1/* $OpenBSD: d1_both.c,v 1.77 2021/07/19 08:42:24 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 <limits.h>
117#include <stdio.h>
118#include <string.h>
119
120#include <openssl/buffer.h>
121#include <openssl/evp.h>
122#include <openssl/objects.h>
123#include <openssl/x509.h>
124
125#include "bytestring.h"
126#include "dtls_locl.h"
127#include "pqueue.h"
128#include "ssl_locl.h"
129
130#define RSMBLY_BITMASK_SIZE(msg_len) (((msg_len) + 7) / 8)
131
132#define RSMBLY_BITMASK_MARK(bitmask, start, end) { \
133 if ((end) - (start) <= 8) { \
134 long ii; \
135 for (ii = (start); ii < (end); ii++) bitmask[((ii) >> 3)] |= (1 << ((ii) & 7)); \
136 } else { \
137 long ii; \
138 bitmask[((start) >> 3)] |= bitmask_start_values[((start) & 7)]; \
139 for (ii = (((start) >> 3) + 1); ii < ((((end) - 1)) >> 3); ii++) bitmask[ii] = 0xff; \
140 bitmask[(((end) - 1) >> 3)] |= bitmask_end_values[((end) & 7)]; \
141 } }
142
143#define RSMBLY_BITMASK_IS_COMPLETE(bitmask, msg_len, is_complete) { \
144 long ii; \
145 OPENSSL_assert((msg_len) > 0); \
146 is_complete = 1; \
147 if (bitmask[(((msg_len) - 1) >> 3)] != bitmask_end_values[((msg_len) & 7)]) is_complete = 0; \
148 if (is_complete) for (ii = (((msg_len) - 1) >> 3) - 1; ii >= 0 ; ii--) \
149 if (bitmask[ii] != 0xff) { is_complete = 0; break; } }
150
151static const unsigned char bitmask_start_values[] = {
152 0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80
153};
154static const unsigned char bitmask_end_values[] = {
155 0xff, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f
156};
157
158/* XDTLS: figure out the right values */
159static const unsigned int g_probable_mtu[] = {1500 - 28, 512 - 28, 256 - 28};
160
161static unsigned int dtls1_guess_mtu(unsigned int curr_mtu);
162static void dtls1_fix_message_header(SSL *s, unsigned long frag_off,
163 unsigned long frag_len);
164static int dtls1_write_message_header(const struct hm_header_st *msg_hdr,
165 unsigned long frag_off, unsigned long frag_len, unsigned char *p);
166static long dtls1_get_message_fragment(SSL *s, int st1, int stn, long max,
167 int *ok);
168
169void dtls1_hm_fragment_free(hm_fragment *frag);
170
171static hm_fragment *
172dtls1_hm_fragment_new(unsigned long frag_len, int reassembly)
173{
174 hm_fragment *frag;
175
176 if ((frag = calloc(1, sizeof(*frag))) == NULL)
177 goto err;
178
179 if (frag_len > 0) {
180 if ((frag->fragment = calloc(1, frag_len)) == NULL)
181 goto err;
182 }
183
184 /* Initialize reassembly bitmask if necessary. */
185 if (reassembly) {
186 if ((frag->reassembly = calloc(1,
187 RSMBLY_BITMASK_SIZE(frag_len))) == NULL)
188 goto err;
189 }
190
191 return frag;
192
193 err:
194 dtls1_hm_fragment_free(frag);
195 return NULL;
196}
197
198void
199dtls1_hm_fragment_free(hm_fragment *frag)
200{
201 if (frag == NULL)
202 return;
203
204 free(frag->fragment);
205 free(frag->reassembly);
206 free(frag);
207}
208
209/* send s->internal->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */
210int
211dtls1_do_write(SSL *s, int type)
212{
213 int ret;
214 int curr_mtu;
215 unsigned int len, frag_off;
216 size_t overhead;
217
218 /* AHA! Figure out the MTU, and stick to the right size */
219 if (D1I(s)->mtu < dtls1_min_mtu() &&
220 !(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) {
221 D1I(s)->mtu = BIO_ctrl(SSL_get_wbio(s),
222 BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
223
224 /*
225 * I've seen the kernel return bogus numbers when it
226 * doesn't know the MTU (ie., the initial write), so just
227 * make sure we have a reasonable number
228 */
229 if (D1I(s)->mtu < dtls1_min_mtu()) {
230 D1I(s)->mtu = 0;
231 D1I(s)->mtu = dtls1_guess_mtu(D1I(s)->mtu);
232 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SET_MTU,
233 D1I(s)->mtu, NULL);
234 }
235 }
236
237 OPENSSL_assert(D1I(s)->mtu >= dtls1_min_mtu());
238 /* should have something reasonable now */
239
240 if (s->internal->init_off == 0 && type == SSL3_RT_HANDSHAKE)
241 OPENSSL_assert(s->internal->init_num ==
242 (int)D1I(s)->w_msg_hdr.msg_len + DTLS1_HM_HEADER_LENGTH);
243
244 if (!tls12_record_layer_write_overhead(s->internal->rl, &overhead))
245 return -1;
246
247 frag_off = 0;
248 while (s->internal->init_num) {
249 curr_mtu = D1I(s)->mtu - BIO_wpending(SSL_get_wbio(s)) -
250 DTLS1_RT_HEADER_LENGTH - overhead;
251
252 if (curr_mtu <= DTLS1_HM_HEADER_LENGTH) {
253 /* grr.. we could get an error if MTU picked was wrong */
254 ret = BIO_flush(SSL_get_wbio(s));
255 if (ret <= 0)
256 return ret;
257 curr_mtu = D1I(s)->mtu - DTLS1_RT_HEADER_LENGTH -
258 overhead;
259 }
260
261 if (s->internal->init_num > curr_mtu)
262 len = curr_mtu;
263 else
264 len = s->internal->init_num;
265
266 /* XDTLS: this function is too long. split out the CCS part */
267 if (type == SSL3_RT_HANDSHAKE) {
268 if (s->internal->init_off != 0) {
269 OPENSSL_assert(s->internal->init_off > DTLS1_HM_HEADER_LENGTH);
270 s->internal->init_off -= DTLS1_HM_HEADER_LENGTH;
271 s->internal->init_num += DTLS1_HM_HEADER_LENGTH;
272
273 if (s->internal->init_num > curr_mtu)
274 len = curr_mtu;
275 else
276 len = s->internal->init_num;
277 }
278
279 dtls1_fix_message_header(s, frag_off,
280 len - DTLS1_HM_HEADER_LENGTH);
281
282 if (!dtls1_write_message_header(&D1I(s)->w_msg_hdr,
283 D1I(s)->w_msg_hdr.frag_off, D1I(s)->w_msg_hdr.frag_len,
284 (unsigned char *)&s->internal->init_buf->data[s->internal->init_off]))
285 return -1;
286
287 OPENSSL_assert(len >= DTLS1_HM_HEADER_LENGTH);
288 }
289
290 ret = dtls1_write_bytes(s, type,
291 &s->internal->init_buf->data[s->internal->init_off], len);
292 if (ret < 0) {
293 /*
294 * Might need to update MTU here, but we don't know
295 * which previous packet caused the failure -- so
296 * can't really retransmit anything. continue as
297 * if everything is fine and wait for an alert to
298 * handle the retransmit
299 */
300 if (BIO_ctrl(SSL_get_wbio(s),
301 BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL) > 0)
302 D1I(s)->mtu = BIO_ctrl(SSL_get_wbio(s),
303 BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
304 else
305 return (-1);
306 } else {
307
308 /*
309 * Bad if this assert fails, only part of the
310 * handshake message got sent. but why would
311 * this happen?
312 */
313 OPENSSL_assert(len == (unsigned int)ret);
314
315 if (type == SSL3_RT_HANDSHAKE &&
316 !D1I(s)->retransmitting) {
317 /*
318 * Should not be done for 'Hello Request's,
319 * but in that case we'll ignore the result
320 * anyway
321 */
322 unsigned char *p = (unsigned char *)&s->internal->init_buf->data[s->internal->init_off];
323 const struct hm_header_st *msg_hdr = &D1I(s)->w_msg_hdr;
324 int xlen;
325
326 if (frag_off == 0) {
327 /*
328 * Reconstruct message header is if it
329 * is being sent in single fragment
330 */
331 if (!dtls1_write_message_header(msg_hdr,
332 0, msg_hdr->msg_len, p))
333 return (-1);
334 xlen = ret;
335 } else {
336 p += DTLS1_HM_HEADER_LENGTH;
337 xlen = ret - DTLS1_HM_HEADER_LENGTH;
338 }
339
340 tls1_transcript_record(s, p, xlen);
341 }
342
343 if (ret == s->internal->init_num) {
344 if (s->internal->msg_callback)
345 s->internal->msg_callback(1, s->version, type,
346 s->internal->init_buf->data,
347 (size_t)(s->internal->init_off + s->internal->init_num),
348 s, s->internal->msg_callback_arg);
349
350 s->internal->init_off = 0;
351 /* done writing this message */
352 s->internal->init_num = 0;
353
354 return (1);
355 }
356 s->internal->init_off += ret;
357 s->internal->init_num -= ret;
358 frag_off += (ret -= DTLS1_HM_HEADER_LENGTH);
359 }
360 }
361 return (0);
362}
363
364
365/*
366 * Obtain handshake message of message type 'mt' (any if mt == -1),
367 * maximum acceptable body length 'max'.
368 * Read an entire handshake message. Handshake messages arrive in
369 * fragments.
370 */
371long
372dtls1_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
373{
374 int i, al;
375 struct hm_header_st *msg_hdr;
376 unsigned char *p;
377 unsigned long msg_len;
378
379 /*
380 * s3->internal->tmp is used to store messages that are unexpected, caused
381 * by the absence of an optional handshake message
382 */
383 if (S3I(s)->hs.tls12.reuse_message) {
384 S3I(s)->hs.tls12.reuse_message = 0;
385 if ((mt >= 0) && (S3I(s)->hs.tls12.message_type != mt)) {
386 al = SSL_AD_UNEXPECTED_MESSAGE;
387 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE);
388 goto fatal_err;
389 }
390 *ok = 1;
391 s->internal->init_msg = s->internal->init_buf->data + DTLS1_HM_HEADER_LENGTH;
392 s->internal->init_num = (int)S3I(s)->hs.tls12.message_size;
393 return s->internal->init_num;
394 }
395
396 msg_hdr = &D1I(s)->r_msg_hdr;
397 memset(msg_hdr, 0, sizeof(struct hm_header_st));
398
399 again:
400 i = dtls1_get_message_fragment(s, st1, stn, max, ok);
401 if (i == DTLS1_HM_BAD_FRAGMENT ||
402 i == DTLS1_HM_FRAGMENT_RETRY) /* bad fragment received */
403 goto again;
404 else if (i <= 0 && !*ok)
405 return i;
406
407 p = (unsigned char *)s->internal->init_buf->data;
408 msg_len = msg_hdr->msg_len;
409
410 /* reconstruct message header */
411 if (!dtls1_write_message_header(msg_hdr, 0, msg_len, p))
412 return -1;
413
414 msg_len += DTLS1_HM_HEADER_LENGTH;
415
416 tls1_transcript_record(s, p, msg_len);
417 if (s->internal->msg_callback)
418 s->internal->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, p, msg_len,
419 s, s->internal->msg_callback_arg);
420
421 memset(msg_hdr, 0, sizeof(struct hm_header_st));
422
423 /* Don't change sequence numbers while listening */
424 if (!D1I(s)->listen)
425 D1I(s)->handshake_read_seq++;
426
427 s->internal->init_msg = s->internal->init_buf->data + DTLS1_HM_HEADER_LENGTH;
428 return s->internal->init_num;
429
430 fatal_err:
431 ssl3_send_alert(s, SSL3_AL_FATAL, al);
432 *ok = 0;
433 return -1;
434}
435
436
437static int
438dtls1_preprocess_fragment(SSL *s, struct hm_header_st *msg_hdr, int max)
439{
440 size_t frag_off, frag_len, msg_len;
441
442 msg_len = msg_hdr->msg_len;
443 frag_off = msg_hdr->frag_off;
444 frag_len = msg_hdr->frag_len;
445
446 /* sanity checking */
447 if ((frag_off + frag_len) > msg_len) {
448 SSLerror(s, SSL_R_EXCESSIVE_MESSAGE_SIZE);
449 return SSL_AD_ILLEGAL_PARAMETER;
450 }
451
452 if ((frag_off + frag_len) > (unsigned long)max) {
453 SSLerror(s, SSL_R_EXCESSIVE_MESSAGE_SIZE);
454 return SSL_AD_ILLEGAL_PARAMETER;
455 }
456
457 if ( D1I(s)->r_msg_hdr.frag_off == 0) /* first fragment */
458 {
459 /*
460 * msg_len is limited to 2^24, but is effectively checked
461 * against max above
462 */
463 if (!BUF_MEM_grow_clean(s->internal->init_buf,
464 msg_len + DTLS1_HM_HEADER_LENGTH)) {
465 SSLerror(s, ERR_R_BUF_LIB);
466 return SSL_AD_INTERNAL_ERROR;
467 }
468
469 S3I(s)->hs.tls12.message_size = msg_len;
470 D1I(s)->r_msg_hdr.msg_len = msg_len;
471 S3I(s)->hs.tls12.message_type = msg_hdr->type;
472 D1I(s)->r_msg_hdr.type = msg_hdr->type;
473 D1I(s)->r_msg_hdr.seq = msg_hdr->seq;
474 } else if (msg_len != D1I(s)->r_msg_hdr.msg_len) {
475 /*
476 * They must be playing with us! BTW, failure to enforce
477 * upper limit would open possibility for buffer overrun.
478 */
479 SSLerror(s, SSL_R_EXCESSIVE_MESSAGE_SIZE);
480 return SSL_AD_ILLEGAL_PARAMETER;
481 }
482
483 return 0; /* no error */
484}
485
486static int
487dtls1_retrieve_buffered_fragment(SSL *s, long max, int *ok)
488{
489 /*
490 * (0) check whether the desired fragment is available
491 * if so:
492 * (1) copy over the fragment to s->internal->init_buf->data[]
493 * (2) update s->internal->init_num
494 */
495 pitem *item;
496 hm_fragment *frag;
497 int al;
498
499 *ok = 0;
500 item = pqueue_peek(D1I(s)->buffered_messages);
501 if (item == NULL)
502 return 0;
503
504 frag = (hm_fragment *)item->data;
505
506 /* Don't return if reassembly still in progress */
507 if (frag->reassembly != NULL)
508 return 0;
509
510 if (D1I(s)->handshake_read_seq == frag->msg_header.seq) {
511 unsigned long frag_len = frag->msg_header.frag_len;
512 pqueue_pop(D1I(s)->buffered_messages);
513
514 al = dtls1_preprocess_fragment(s, &frag->msg_header, max);
515
516 if (al == 0) /* no alert */
517 {
518 unsigned char *p = (unsigned char *)s->internal->init_buf->data + DTLS1_HM_HEADER_LENGTH;
519 memcpy(&p[frag->msg_header.frag_off],
520 frag->fragment, frag->msg_header.frag_len);
521 }
522
523 dtls1_hm_fragment_free(frag);
524 pitem_free(item);
525
526 if (al == 0) {
527 *ok = 1;
528 return frag_len;
529 }
530
531 ssl3_send_alert(s, SSL3_AL_FATAL, al);
532 s->internal->init_num = 0;
533 *ok = 0;
534 return -1;
535 } else
536 return 0;
537}
538
539/*
540 * dtls1_max_handshake_message_len returns the maximum number of bytes
541 * permitted in a DTLS handshake message for |s|. The minimum is 16KB,
542 * but may be greater if the maximum certificate list size requires it.
543 */
544static unsigned long
545dtls1_max_handshake_message_len(const SSL *s)
546{
547 unsigned long max_len;
548
549 max_len = DTLS1_HM_HEADER_LENGTH + SSL3_RT_MAX_ENCRYPTED_LENGTH;
550 if (max_len < (unsigned long)s->internal->max_cert_list)
551 return s->internal->max_cert_list;
552 return max_len;
553}
554
555static int
556dtls1_reassemble_fragment(SSL *s, struct hm_header_st* msg_hdr, int *ok)
557{
558 hm_fragment *frag = NULL;
559 pitem *item = NULL;
560 int i = -1, is_complete;
561 unsigned char seq64be[8];
562 unsigned long frag_len = msg_hdr->frag_len;
563
564 if ((msg_hdr->frag_off + frag_len) > msg_hdr->msg_len ||
565 msg_hdr->msg_len > dtls1_max_handshake_message_len(s))
566 goto err;
567
568 if (frag_len == 0) {
569 i = DTLS1_HM_FRAGMENT_RETRY;
570 goto err;
571 }
572
573 /* Try to find item in queue */
574 memset(seq64be, 0, sizeof(seq64be));
575 seq64be[6] = (unsigned char)(msg_hdr->seq >> 8);
576 seq64be[7] = (unsigned char)msg_hdr->seq;
577 item = pqueue_find(D1I(s)->buffered_messages, seq64be);
578
579 if (item == NULL) {
580 frag = dtls1_hm_fragment_new(msg_hdr->msg_len, 1);
581 if (frag == NULL)
582 goto err;
583 memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr));
584 frag->msg_header.frag_len = frag->msg_header.msg_len;
585 frag->msg_header.frag_off = 0;
586 } else {
587 frag = (hm_fragment*)item->data;
588 if (frag->msg_header.msg_len != msg_hdr->msg_len) {
589 item = NULL;
590 frag = NULL;
591 goto err;
592 }
593 }
594
595 /*
596 * If message is already reassembled, this must be a
597 * retransmit and can be dropped.
598 */
599 if (frag->reassembly == NULL) {
600 unsigned char devnull [256];
601
602 while (frag_len) {
603 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
604 devnull, frag_len > sizeof(devnull) ?
605 sizeof(devnull) : frag_len, 0);
606 if (i <= 0)
607 goto err;
608 frag_len -= i;
609 }
610 i = DTLS1_HM_FRAGMENT_RETRY;
611 goto err;
612 }
613
614 /* read the body of the fragment (header has already been read */
615 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
616 frag->fragment + msg_hdr->frag_off, frag_len, 0);
617 if (i <= 0 || (unsigned long)i != frag_len)
618 goto err;
619
620 RSMBLY_BITMASK_MARK(frag->reassembly, (long)msg_hdr->frag_off,
621 (long)(msg_hdr->frag_off + frag_len));
622
623 RSMBLY_BITMASK_IS_COMPLETE(frag->reassembly, (long)msg_hdr->msg_len,
624 is_complete);
625
626 if (is_complete) {
627 free(frag->reassembly);
628 frag->reassembly = NULL;
629 }
630
631 if (item == NULL) {
632 memset(seq64be, 0, sizeof(seq64be));
633 seq64be[6] = (unsigned char)(msg_hdr->seq >> 8);
634 seq64be[7] = (unsigned char)(msg_hdr->seq);
635
636 item = pitem_new(seq64be, frag);
637 if (item == NULL) {
638 i = -1;
639 goto err;
640 }
641
642 pqueue_insert(D1I(s)->buffered_messages, item);
643 }
644
645 return DTLS1_HM_FRAGMENT_RETRY;
646
647 err:
648 if (item == NULL && frag != NULL)
649 dtls1_hm_fragment_free(frag);
650 *ok = 0;
651 return i;
652}
653
654
655static int
656dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok)
657{
658 int i = -1;
659 hm_fragment *frag = NULL;
660 pitem *item = NULL;
661 unsigned char seq64be[8];
662 unsigned long frag_len = msg_hdr->frag_len;
663
664 if ((msg_hdr->frag_off + frag_len) > msg_hdr->msg_len)
665 goto err;
666
667 /* Try to find item in queue, to prevent duplicate entries */
668 memset(seq64be, 0, sizeof(seq64be));
669 seq64be[6] = (unsigned char) (msg_hdr->seq >> 8);
670 seq64be[7] = (unsigned char) msg_hdr->seq;
671 item = pqueue_find(D1I(s)->buffered_messages, seq64be);
672
673 /*
674 * If we already have an entry and this one is a fragment,
675 * don't discard it and rather try to reassemble it.
676 */
677 if (item != NULL && frag_len < msg_hdr->msg_len)
678 item = NULL;
679
680 /*
681 * Discard the message if sequence number was already there, is
682 * too far in the future, already in the queue or if we received
683 * a FINISHED before the SERVER_HELLO, which then must be a stale
684 * retransmit.
685 */
686 if (msg_hdr->seq <= D1I(s)->handshake_read_seq ||
687 msg_hdr->seq > D1I(s)->handshake_read_seq + 10 || item != NULL ||
688 (D1I(s)->handshake_read_seq == 0 &&
689 msg_hdr->type == SSL3_MT_FINISHED)) {
690 unsigned char devnull [256];
691
692 while (frag_len) {
693 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
694 devnull, frag_len > sizeof(devnull) ?
695 sizeof(devnull) : frag_len, 0);
696 if (i <= 0)
697 goto err;
698 frag_len -= i;
699 }
700 } else {
701 if (frag_len < msg_hdr->msg_len)
702 return dtls1_reassemble_fragment(s, msg_hdr, ok);
703
704 if (frag_len > dtls1_max_handshake_message_len(s))
705 goto err;
706
707 frag = dtls1_hm_fragment_new(frag_len, 0);
708 if (frag == NULL)
709 goto err;
710
711 memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr));
712
713 if (frag_len) {
714 /* read the body of the fragment (header has already been read */
715 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
716 frag->fragment, frag_len, 0);
717 if (i <= 0 || (unsigned long)i != frag_len)
718 goto err;
719 }
720
721 memset(seq64be, 0, sizeof(seq64be));
722 seq64be[6] = (unsigned char)(msg_hdr->seq >> 8);
723 seq64be[7] = (unsigned char)(msg_hdr->seq);
724
725 item = pitem_new(seq64be, frag);
726 if (item == NULL)
727 goto err;
728
729 pqueue_insert(D1I(s)->buffered_messages, item);
730 }
731
732 return DTLS1_HM_FRAGMENT_RETRY;
733
734 err:
735 if (item == NULL && frag != NULL)
736 dtls1_hm_fragment_free(frag);
737 *ok = 0;
738 return i;
739}
740
741
742static long
743dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok)
744{
745 unsigned char wire[DTLS1_HM_HEADER_LENGTH];
746 unsigned long len, frag_off, frag_len;
747 int i, al;
748 struct hm_header_st msg_hdr;
749
750 again:
751 /* see if we have the required fragment already */
752 if ((frag_len = dtls1_retrieve_buffered_fragment(s, max, ok)) || *ok) {
753 if (*ok)
754 s->internal->init_num = frag_len;
755 return frag_len;
756 }
757
758 /* read handshake message header */
759 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, wire,
760 DTLS1_HM_HEADER_LENGTH, 0);
761 if (i <= 0) /* nbio, or an error */
762 {
763 s->internal->rwstate = SSL_READING;
764 *ok = 0;
765 return i;
766 }
767 /* Handshake fails if message header is incomplete */
768 if (i != DTLS1_HM_HEADER_LENGTH ||
769 /* parse the message fragment header */
770 dtls1_get_message_header(wire, &msg_hdr) == 0) {
771 al = SSL_AD_UNEXPECTED_MESSAGE;
772 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE);
773 goto fatal_err;
774 }
775
776 /*
777 * if this is a future (or stale) message it gets buffered
778 * (or dropped)--no further processing at this time
779 * While listening, we accept seq 1 (ClientHello with cookie)
780 * although we're still expecting seq 0 (ClientHello)
781 */
782 if (msg_hdr.seq != D1I(s)->handshake_read_seq &&
783 !(D1I(s)->listen && msg_hdr.seq == 1))
784 return dtls1_process_out_of_seq_message(s, &msg_hdr, ok);
785
786 len = msg_hdr.msg_len;
787 frag_off = msg_hdr.frag_off;
788 frag_len = msg_hdr.frag_len;
789
790 if (frag_len && frag_len < len)
791 return dtls1_reassemble_fragment(s, &msg_hdr, ok);
792
793 if (!s->server && D1I(s)->r_msg_hdr.frag_off == 0 &&
794 wire[0] == SSL3_MT_HELLO_REQUEST) {
795 /*
796 * The server may always send 'Hello Request' messages --
797 * we are doing a handshake anyway now, so ignore them
798 * if their format is correct. Does not count for
799 * 'Finished' MAC.
800 */
801 if (wire[1] == 0 && wire[2] == 0 && wire[3] == 0) {
802 if (s->internal->msg_callback)
803 s->internal->msg_callback(0, s->version,
804 SSL3_RT_HANDSHAKE, wire,
805 DTLS1_HM_HEADER_LENGTH, s,
806 s->internal->msg_callback_arg);
807
808 s->internal->init_num = 0;
809 goto again;
810 }
811 else /* Incorrectly formated Hello request */
812 {
813 al = SSL_AD_UNEXPECTED_MESSAGE;
814 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE);
815 goto fatal_err;
816 }
817 }
818
819 if ((al = dtls1_preprocess_fragment(s, &msg_hdr, max)))
820 goto fatal_err;
821
822 /* XDTLS: ressurect this when restart is in place */
823 S3I(s)->hs.state = stn;
824
825 if (frag_len > 0) {
826 unsigned char *p = (unsigned char *)s->internal->init_buf->data + DTLS1_HM_HEADER_LENGTH;
827
828 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
829 &p[frag_off], frag_len, 0);
830 /* XDTLS: fix this--message fragments cannot span multiple packets */
831 if (i <= 0) {
832 s->internal->rwstate = SSL_READING;
833 *ok = 0;
834 return i;
835 }
836 } else
837 i = 0;
838
839 /*
840 * XDTLS: an incorrectly formatted fragment should cause the
841 * handshake to fail
842 */
843 if (i != (int)frag_len) {
844 al = SSL_AD_ILLEGAL_PARAMETER;
845 SSLerror(s, SSL_R_SSLV3_ALERT_ILLEGAL_PARAMETER);
846 goto fatal_err;
847 }
848
849 *ok = 1;
850
851 /*
852 * Note that s->internal->init_num is *not* used as current offset in
853 * s->internal->init_buf->data, but as a counter summing up fragments'
854 * lengths: as soon as they sum up to handshake packet
855 * length, we assume we have got all the fragments.
856 */
857 s->internal->init_num = frag_len;
858 return frag_len;
859
860 fatal_err:
861 ssl3_send_alert(s, SSL3_AL_FATAL, al);
862 s->internal->init_num = 0;
863
864 *ok = 0;
865 return (-1);
866}
867
868int
869dtls1_read_failed(SSL *s, int code)
870{
871 if (code > 0) {
872#ifdef DEBUG
873 fprintf(stderr, "invalid state reached %s:%d",
874 __FILE__, __LINE__);
875#endif
876 return 1;
877 }
878
879 if (!dtls1_is_timer_expired(s)) {
880 /*
881 * not a timeout, none of our business, let higher layers
882 * handle this. in fact it's probably an error
883 */
884 return code;
885 }
886
887 if (!SSL_in_init(s)) /* done, no need to send a retransmit */
888 {
889 BIO_set_flags(SSL_get_rbio(s), BIO_FLAGS_READ);
890 return code;
891 }
892
893 return dtls1_handle_timeout(s);
894}
895
896int
897dtls1_get_queue_priority(unsigned short seq, int is_ccs)
898{
899 /*
900 * The index of the retransmission queue actually is the message
901 * sequence number, since the queue only contains messages of a
902 * single handshake. However, the ChangeCipherSpec has no message
903 * sequence number and so using only the sequence will result in
904 * the CCS and Finished having the same index. To prevent this, the
905 * sequence number is multiplied by 2. In case of a CCS 1 is
906 * subtracted. This does not only differ CSS and Finished, it also
907 * maintains the order of the index (important for priority queues)
908 * and fits in the unsigned short variable.
909 */
910 return seq * 2 - is_ccs;
911}
912
913int
914dtls1_retransmit_buffered_messages(SSL *s)
915{
916 pqueue sent = s->d1->sent_messages;
917 piterator iter;
918 pitem *item;
919 hm_fragment *frag;
920 int found = 0;
921
922 iter = pqueue_iterator(sent);
923
924 for (item = pqueue_next(&iter); item != NULL;
925 item = pqueue_next(&iter)) {
926 frag = (hm_fragment *)item->data;
927 if (dtls1_retransmit_message(s,
928 (unsigned short)dtls1_get_queue_priority(
929 frag->msg_header.seq, frag->msg_header.is_ccs), 0,
930 &found) <= 0 && found) {
931#ifdef DEBUG
932 fprintf(stderr, "dtls1_retransmit_message() failed\n");
933#endif
934 return -1;
935 }
936 }
937
938 return 1;
939}
940
941int
942dtls1_buffer_message(SSL *s, int is_ccs)
943{
944 pitem *item;
945 hm_fragment *frag;
946 unsigned char seq64be[8];
947
948 /* Buffer the messsage in order to handle DTLS retransmissions. */
949
950 /*
951 * This function is called immediately after a message has
952 * been serialized
953 */
954 OPENSSL_assert(s->internal->init_off == 0);
955
956 frag = dtls1_hm_fragment_new(s->internal->init_num, 0);
957 if (frag == NULL)
958 return 0;
959
960 memcpy(frag->fragment, s->internal->init_buf->data, s->internal->init_num);
961
962 OPENSSL_assert(D1I(s)->w_msg_hdr.msg_len +
963 (is_ccs ? DTLS1_CCS_HEADER_LENGTH : DTLS1_HM_HEADER_LENGTH) ==
964 (unsigned int)s->internal->init_num);
965
966 frag->msg_header.msg_len = D1I(s)->w_msg_hdr.msg_len;
967 frag->msg_header.seq = D1I(s)->w_msg_hdr.seq;
968 frag->msg_header.type = D1I(s)->w_msg_hdr.type;
969 frag->msg_header.frag_off = 0;
970 frag->msg_header.frag_len = D1I(s)->w_msg_hdr.msg_len;
971 frag->msg_header.is_ccs = is_ccs;
972
973 /* save current state*/
974 frag->msg_header.saved_retransmit_state.session = s->session;
975 frag->msg_header.saved_retransmit_state.epoch =
976 tls12_record_layer_write_epoch(s->internal->rl);
977
978 memset(seq64be, 0, sizeof(seq64be));
979 seq64be[6] = (unsigned char)(dtls1_get_queue_priority(
980 frag->msg_header.seq, frag->msg_header.is_ccs) >> 8);
981 seq64be[7] = (unsigned char)(dtls1_get_queue_priority(
982 frag->msg_header.seq, frag->msg_header.is_ccs));
983
984 item = pitem_new(seq64be, frag);
985 if (item == NULL) {
986 dtls1_hm_fragment_free(frag);
987 return 0;
988 }
989
990 pqueue_insert(s->d1->sent_messages, item);
991 return 1;
992}
993
994int
995dtls1_retransmit_message(SSL *s, unsigned short seq, unsigned long frag_off,
996 int *found)
997{
998 int ret;
999 /* XDTLS: for now assuming that read/writes are blocking */
1000 pitem *item;
1001 hm_fragment *frag;
1002 unsigned long header_length;
1003 unsigned char seq64be[8];
1004 struct dtls1_retransmit_state saved_state;
1005
1006 /*
1007 OPENSSL_assert(s->internal->init_num == 0);
1008 OPENSSL_assert(s->internal->init_off == 0);
1009 */
1010
1011 /* XDTLS: the requested message ought to be found, otherwise error */
1012 memset(seq64be, 0, sizeof(seq64be));
1013 seq64be[6] = (unsigned char)(seq >> 8);
1014 seq64be[7] = (unsigned char)seq;
1015
1016 item = pqueue_find(s->d1->sent_messages, seq64be);
1017 if (item == NULL) {
1018#ifdef DEBUG
1019 fprintf(stderr, "retransmit: message %d non-existent\n", seq);
1020#endif
1021 *found = 0;
1022 return 0;
1023 }
1024
1025 *found = 1;
1026 frag = (hm_fragment *)item->data;
1027
1028 if (frag->msg_header.is_ccs)
1029 header_length = DTLS1_CCS_HEADER_LENGTH;
1030 else
1031 header_length = DTLS1_HM_HEADER_LENGTH;
1032
1033 memcpy(s->internal->init_buf->data, frag->fragment,
1034 frag->msg_header.msg_len + header_length);
1035 s->internal->init_num = frag->msg_header.msg_len + header_length;
1036
1037 dtls1_set_message_header_int(s, frag->msg_header.type,
1038 frag->msg_header.msg_len, frag->msg_header.seq, 0,
1039 frag->msg_header.frag_len);
1040
1041 /* save current state */
1042 saved_state.session = s->session;
1043 saved_state.epoch = tls12_record_layer_write_epoch(s->internal->rl);
1044
1045 D1I(s)->retransmitting = 1;
1046
1047 /* restore state in which the message was originally sent */
1048 s->session = frag->msg_header.saved_retransmit_state.session;
1049 if (!tls12_record_layer_use_write_epoch(s->internal->rl,
1050 frag->msg_header.saved_retransmit_state.epoch))
1051 return 0;
1052
1053 ret = dtls1_do_write(s, frag->msg_header.is_ccs ?
1054 SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE);
1055
1056 /* restore current state */
1057 s->session = saved_state.session;
1058 if (!tls12_record_layer_use_write_epoch(s->internal->rl,
1059 saved_state.epoch))
1060 return 0;
1061
1062 D1I(s)->retransmitting = 0;
1063
1064 (void)BIO_flush(SSL_get_wbio(s));
1065 return ret;
1066}
1067
1068/* call this function when the buffered messages are no longer needed */
1069void
1070dtls1_clear_record_buffer(SSL *s)
1071{
1072 hm_fragment *frag;
1073 pitem *item;
1074
1075 for(item = pqueue_pop(s->d1->sent_messages); item != NULL;
1076 item = pqueue_pop(s->d1->sent_messages)) {
1077 frag = item->data;
1078 if (frag->msg_header.is_ccs)
1079 tls12_record_layer_write_epoch_done(s->internal->rl,
1080 frag->msg_header.saved_retransmit_state.epoch);
1081 dtls1_hm_fragment_free(frag);
1082 pitem_free(item);
1083 }
1084}
1085
1086void
1087dtls1_set_message_header(SSL *s, unsigned char mt, unsigned long len,
1088 unsigned long frag_off, unsigned long frag_len)
1089{
1090 /* Don't change sequence numbers while listening */
1091 if (frag_off == 0 && !D1I(s)->listen) {
1092 D1I(s)->handshake_write_seq = D1I(s)->next_handshake_write_seq;
1093 D1I(s)->next_handshake_write_seq++;
1094 }
1095
1096 dtls1_set_message_header_int(s, mt, len, D1I(s)->handshake_write_seq,
1097 frag_off, frag_len);
1098}
1099
1100/* don't actually do the writing, wait till the MTU has been retrieved */
1101void
1102dtls1_set_message_header_int(SSL *s, unsigned char mt, unsigned long len,
1103 unsigned short seq_num, unsigned long frag_off, unsigned long frag_len)
1104{
1105 struct hm_header_st *msg_hdr = &D1I(s)->w_msg_hdr;
1106
1107 msg_hdr->type = mt;
1108 msg_hdr->msg_len = len;
1109 msg_hdr->seq = seq_num;
1110 msg_hdr->frag_off = frag_off;
1111 msg_hdr->frag_len = frag_len;
1112}
1113
1114static void
1115dtls1_fix_message_header(SSL *s, unsigned long frag_off, unsigned long frag_len)
1116{
1117 struct hm_header_st *msg_hdr = &D1I(s)->w_msg_hdr;
1118
1119 msg_hdr->frag_off = frag_off;
1120 msg_hdr->frag_len = frag_len;
1121}
1122
1123static int
1124dtls1_write_message_header(const struct hm_header_st *msg_hdr,
1125 unsigned long frag_off, unsigned long frag_len, unsigned char *p)
1126{
1127 CBB cbb;
1128
1129 /* We assume DTLS1_HM_HEADER_LENGTH bytes are available for now... */
1130 if (!CBB_init_fixed(&cbb, p, DTLS1_HM_HEADER_LENGTH))
1131 return 0;
1132 if (!CBB_add_u8(&cbb, msg_hdr->type))
1133 goto err;
1134 if (!CBB_add_u24(&cbb, msg_hdr->msg_len))
1135 goto err;
1136 if (!CBB_add_u16(&cbb, msg_hdr->seq))
1137 goto err;
1138 if (!CBB_add_u24(&cbb, frag_off))
1139 goto err;
1140 if (!CBB_add_u24(&cbb, frag_len))
1141 goto err;
1142 if (!CBB_finish(&cbb, NULL, NULL))
1143 goto err;
1144
1145 return 1;
1146
1147 err:
1148 CBB_cleanup(&cbb);
1149 return 0;
1150}
1151
1152unsigned int
1153dtls1_min_mtu(void)
1154{
1155 return (g_probable_mtu[(sizeof(g_probable_mtu) /
1156 sizeof(g_probable_mtu[0])) - 1]);
1157}
1158
1159static unsigned int
1160dtls1_guess_mtu(unsigned int curr_mtu)
1161{
1162 unsigned int i;
1163
1164 if (curr_mtu == 0)
1165 return g_probable_mtu[0];
1166
1167 for (i = 0; i < sizeof(g_probable_mtu) / sizeof(g_probable_mtu[0]); i++)
1168 if (curr_mtu > g_probable_mtu[i])
1169 return g_probable_mtu[i];
1170
1171 return curr_mtu;
1172}
1173
1174int
1175dtls1_get_message_header(unsigned char *data, struct hm_header_st *msg_hdr)
1176{
1177 CBS header;
1178 uint32_t msg_len, frag_off, frag_len;
1179 uint16_t seq;
1180 uint8_t type;
1181
1182 CBS_init(&header, data, sizeof(*msg_hdr));
1183
1184 memset(msg_hdr, 0, sizeof(*msg_hdr));
1185
1186 if (!CBS_get_u8(&header, &type))
1187 return 0;
1188 if (!CBS_get_u24(&header, &msg_len))
1189 return 0;
1190 if (!CBS_get_u16(&header, &seq))
1191 return 0;
1192 if (!CBS_get_u24(&header, &frag_off))
1193 return 0;
1194 if (!CBS_get_u24(&header, &frag_len))
1195 return 0;
1196
1197 msg_hdr->type = type;
1198 msg_hdr->msg_len = msg_len;
1199 msg_hdr->seq = seq;
1200 msg_hdr->frag_off = frag_off;
1201 msg_hdr->frag_len = frag_len;
1202
1203 return 1;
1204}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2026-02-12 19:05:06 +0000