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diff --git a/src/lib/libssl/d1_both.c b/src/lib/libssl/d1_both.c
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1/* $OpenBSD: d1_both.c,v 1.39 2016/03/06 14:52:15 beck 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 "ssl_locl.h"
121
122#include <openssl/buffer.h>
123#include <openssl/evp.h>
124#include <openssl/objects.h>
125#include <openssl/x509.h>
126
127#include "pqueue.h"
128#include "bytestring.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 unsigned char bitmask_start_values[] = {
152 0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80
153};
154static unsigned char bitmask_end_values[] = {
155 0xff, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f
156};
157
158/* XDTLS: figure out the right values */
159static 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 unsigned char *dtls1_write_message_header(SSL *s, unsigned char *p);
165static void dtls1_set_message_header_int(SSL *s, unsigned char mt,
166 unsigned long len, unsigned short seq_num, unsigned long frag_off,
167 unsigned long frag_len);
168static long dtls1_get_message_fragment(SSL *s, int st1, int stn, long max,
169 int *ok);
170
171static hm_fragment *
172dtls1_hm_fragment_new(unsigned long frag_len, int reassembly)
173{
174 hm_fragment *frag = NULL;
175 unsigned char *buf = NULL;
176 unsigned char *bitmask = NULL;
177
178 frag = malloc(sizeof(hm_fragment));
179 if (frag == NULL)
180 return NULL;
181
182 if (frag_len) {
183 buf = malloc(frag_len);
184 if (buf == NULL) {
185 free(frag);
186 return NULL;
187 }
188 }
189
190 /* zero length fragment gets zero frag->fragment */
191 frag->fragment = buf;
192
193 /* Initialize reassembly bitmask if necessary */
194 if (reassembly) {
195 bitmask = malloc(RSMBLY_BITMASK_SIZE(frag_len));
196 if (bitmask == NULL) {
197 free(buf);
198 free(frag);
199 return NULL;
200 }
201 memset(bitmask, 0, RSMBLY_BITMASK_SIZE(frag_len));
202 }
203
204 frag->reassembly = bitmask;
205
206 return frag;
207}
208
209static void
210dtls1_hm_fragment_free(hm_fragment *frag)
211{
212 if (frag == NULL)
213 return;
214
215 if (frag->msg_header.is_ccs) {
216 EVP_CIPHER_CTX_free(
217 frag->msg_header.saved_retransmit_state.enc_write_ctx);
218 EVP_MD_CTX_destroy(
219 frag->msg_header.saved_retransmit_state.write_hash);
220 }
221 free(frag->fragment);
222 free(frag->reassembly);
223 free(frag);
224}
225
226/* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */
227int
228dtls1_do_write(SSL *s, int type)
229{
230 int ret;
231 int curr_mtu;
232 unsigned int len, frag_off, mac_size, blocksize;
233
234 /* AHA! Figure out the MTU, and stick to the right size */
235 if (s->d1->mtu < dtls1_min_mtu() &&
236 !(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) {
237 s->d1->mtu = BIO_ctrl(SSL_get_wbio(s),
238 BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
239
240 /*
241 * I've seen the kernel return bogus numbers when it
242 * doesn't know the MTU (ie., the initial write), so just
243 * make sure we have a reasonable number
244 */
245 if (s->d1->mtu < dtls1_min_mtu()) {
246 s->d1->mtu = 0;
247 s->d1->mtu = dtls1_guess_mtu(s->d1->mtu);
248 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SET_MTU,
249 s->d1->mtu, NULL);
250 }
251 }
252
253 OPENSSL_assert(s->d1->mtu >= dtls1_min_mtu());
254 /* should have something reasonable now */
255
256 if (s->init_off == 0 && type == SSL3_RT_HANDSHAKE)
257 OPENSSL_assert(s->init_num ==
258 (int)s->d1->w_msg_hdr.msg_len + DTLS1_HM_HEADER_LENGTH);
259
260 if (s->write_hash)
261 mac_size = EVP_MD_CTX_size(s->write_hash);
262 else
263 mac_size = 0;
264
265 if (s->enc_write_ctx &&
266 (EVP_CIPHER_mode( s->enc_write_ctx->cipher) & EVP_CIPH_CBC_MODE))
267 blocksize = 2 * EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
268 else
269 blocksize = 0;
270
271 frag_off = 0;
272 while (s->init_num) {
273 curr_mtu = s->d1->mtu - BIO_wpending(SSL_get_wbio(s)) -
274 DTLS1_RT_HEADER_LENGTH - mac_size - blocksize;
275
276 if (curr_mtu <= DTLS1_HM_HEADER_LENGTH) {
277 /* grr.. we could get an error if MTU picked was wrong */
278 ret = BIO_flush(SSL_get_wbio(s));
279 if (ret <= 0)
280 return ret;
281 curr_mtu = s->d1->mtu - DTLS1_RT_HEADER_LENGTH -
282 mac_size - blocksize;
283 }
284
285 if (s->init_num > curr_mtu)
286 len = curr_mtu;
287 else
288 len = s->init_num;
289
290
291 /* XDTLS: this function is too long. split out the CCS part */
292 if (type == SSL3_RT_HANDSHAKE) {
293 if (s->init_off != 0) {
294 OPENSSL_assert(s->init_off > DTLS1_HM_HEADER_LENGTH);
295 s->init_off -= DTLS1_HM_HEADER_LENGTH;
296 s->init_num += DTLS1_HM_HEADER_LENGTH;
297
298 if (s->init_num > curr_mtu)
299 len = curr_mtu;
300 else
301 len = s->init_num;
302 }
303
304 dtls1_fix_message_header(s, frag_off,
305 len - DTLS1_HM_HEADER_LENGTH);
306
307 dtls1_write_message_header(s,
308 (unsigned char *)&s->init_buf->data[s->init_off]);
309
310 OPENSSL_assert(len >= DTLS1_HM_HEADER_LENGTH);
311 }
312
313 ret = dtls1_write_bytes(s, type,
314 &s->init_buf->data[s->init_off], len);
315 if (ret < 0) {
316 /*
317 * Might need to update MTU here, but we don't know
318 * which previous packet caused the failure -- so
319 * can't really retransmit anything. continue as
320 * if everything is fine and wait for an alert to
321 * handle the retransmit
322 */
323 if (BIO_ctrl(SSL_get_wbio(s),
324 BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL) > 0)
325 s->d1->mtu = BIO_ctrl(SSL_get_wbio(s),
326 BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
327 else
328 return (-1);
329 } else {
330
331 /*
332 * Bad if this assert fails, only part of the
333 * handshake message got sent. but why would
334 * this happen?
335 */
336 OPENSSL_assert(len == (unsigned int)ret);
337
338 if (type == SSL3_RT_HANDSHAKE &&
339 !s->d1->retransmitting) {
340 /*
341 * Should not be done for 'Hello Request's,
342 * but in that case we'll ignore the result
343 * anyway
344 */
345 unsigned char *p = (unsigned char *)&s->init_buf->data[s->init_off];
346 const struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
347 int xlen;
348
349 if (frag_off == 0) {
350 /*
351 * Reconstruct message header is if it
352 * is being sent in single fragment
353 */
354 *p++ = msg_hdr->type;
355 l2n3(msg_hdr->msg_len, p);
356 s2n (msg_hdr->seq, p);
357 l2n3(0, p);
358 l2n3(msg_hdr->msg_len, p);
359 p -= DTLS1_HM_HEADER_LENGTH;
360 xlen = ret;
361 } else {
362 p += DTLS1_HM_HEADER_LENGTH;
363 xlen = ret - DTLS1_HM_HEADER_LENGTH;
364 }
365
366 tls1_finish_mac(s, p, xlen);
367 }
368
369 if (ret == s->init_num) {
370 if (s->msg_callback)
371 s->msg_callback(1, s->version, type,
372 s->init_buf->data,
373 (size_t)(s->init_off + s->init_num),
374 s, s->msg_callback_arg);
375
376 s->init_off = 0;
377 /* done writing this message */
378 s->init_num = 0;
379
380 return (1);
381 }
382 s->init_off += ret;
383 s->init_num -= ret;
384 frag_off += (ret -= DTLS1_HM_HEADER_LENGTH);
385 }
386 }
387 return (0);
388}
389
390
391/*
392 * Obtain handshake message of message type 'mt' (any if mt == -1),
393 * maximum acceptable body length 'max'.
394 * Read an entire handshake message. Handshake messages arrive in
395 * fragments.
396 */
397long
398dtls1_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
399{
400 int i, al;
401 struct hm_header_st *msg_hdr;
402 unsigned char *p;
403 unsigned long msg_len;
404
405 /*
406 * s3->tmp is used to store messages that are unexpected, caused
407 * by the absence of an optional handshake message
408 */
409 if (s->s3->tmp.reuse_message) {
410 s->s3->tmp.reuse_message = 0;
411 if ((mt >= 0) && (s->s3->tmp.message_type != mt)) {
412 al = SSL_AD_UNEXPECTED_MESSAGE;
413 SSLerr(SSL_F_DTLS1_GET_MESSAGE,
414 SSL_R_UNEXPECTED_MESSAGE);
415 goto f_err;
416 }
417 *ok = 1;
418 s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
419 s->init_num = (int)s->s3->tmp.message_size;
420 return s->init_num;
421 }
422
423 msg_hdr = &s->d1->r_msg_hdr;
424 memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
425
426again:
427 i = dtls1_get_message_fragment(s, st1, stn, max, ok);
428 if (i == DTLS1_HM_BAD_FRAGMENT ||
429 i == DTLS1_HM_FRAGMENT_RETRY) /* bad fragment received */
430 goto again;
431 else if (i <= 0 && !*ok)
432 return i;
433
434 p = (unsigned char *)s->init_buf->data;
435 msg_len = msg_hdr->msg_len;
436
437 /* reconstruct message header */
438 *(p++) = msg_hdr->type;
439 l2n3(msg_len, p);
440 s2n (msg_hdr->seq, p);
441 l2n3(0, p);
442 l2n3(msg_len, p);
443
444 p -= DTLS1_HM_HEADER_LENGTH;
445 msg_len += DTLS1_HM_HEADER_LENGTH;
446
447 tls1_finish_mac(s, p, msg_len);
448 if (s->msg_callback)
449 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, p, msg_len,
450 s, s->msg_callback_arg);
451
452 memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
453
454 /* Don't change sequence numbers while listening */
455 if (!s->d1->listen)
456 s->d1->handshake_read_seq++;
457
458 s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
459 return s->init_num;
460
461f_err:
462 ssl3_send_alert(s, SSL3_AL_FATAL, al);
463 *ok = 0;
464 return -1;
465}
466
467
468static int
469dtls1_preprocess_fragment(SSL *s, struct hm_header_st *msg_hdr, int max)
470{
471 size_t frag_off, frag_len, msg_len;
472
473 msg_len = msg_hdr->msg_len;
474 frag_off = msg_hdr->frag_off;
475 frag_len = msg_hdr->frag_len;
476
477 /* sanity checking */
478 if ((frag_off + frag_len) > msg_len) {
479 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,
480 SSL_R_EXCESSIVE_MESSAGE_SIZE);
481 return SSL_AD_ILLEGAL_PARAMETER;
482 }
483
484 if ((frag_off + frag_len) > (unsigned long)max) {
485 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,
486 SSL_R_EXCESSIVE_MESSAGE_SIZE);
487 return SSL_AD_ILLEGAL_PARAMETER;
488 }
489
490 if ( s->d1->r_msg_hdr.frag_off == 0) /* first fragment */
491 {
492 /*
493 * msg_len is limited to 2^24, but is effectively checked
494 * against max above
495 */
496 if (!BUF_MEM_grow_clean(s->init_buf,
497 msg_len + DTLS1_HM_HEADER_LENGTH)) {
498 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT, ERR_R_BUF_LIB);
499 return SSL_AD_INTERNAL_ERROR;
500 }
501
502 s->s3->tmp.message_size = msg_len;
503 s->d1->r_msg_hdr.msg_len = msg_len;
504 s->s3->tmp.message_type = msg_hdr->type;
505 s->d1->r_msg_hdr.type = msg_hdr->type;
506 s->d1->r_msg_hdr.seq = msg_hdr->seq;
507 } else if (msg_len != s->d1->r_msg_hdr.msg_len) {
508 /*
509 * They must be playing with us! BTW, failure to enforce
510 * upper limit would open possibility for buffer overrun.
511 */
512 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,
513 SSL_R_EXCESSIVE_MESSAGE_SIZE);
514 return SSL_AD_ILLEGAL_PARAMETER;
515 }
516
517 return 0; /* no error */
518}
519
520static int
521dtls1_retrieve_buffered_fragment(SSL *s, long max, int *ok)
522{
523 /*
524 * (0) check whether the desired fragment is available
525 * if so:
526 * (1) copy over the fragment to s->init_buf->data[]
527 * (2) update s->init_num
528 */
529 pitem *item;
530 hm_fragment *frag;
531 int al;
532
533 *ok = 0;
534 item = pqueue_peek(s->d1->buffered_messages);
535 if (item == NULL)
536 return 0;
537
538 frag = (hm_fragment *)item->data;
539
540 /* Don't return if reassembly still in progress */
541 if (frag->reassembly != NULL)
542 return 0;
543
544 if (s->d1->handshake_read_seq == frag->msg_header.seq) {
545 unsigned long frag_len = frag->msg_header.frag_len;
546 pqueue_pop(s->d1->buffered_messages);
547
548 al = dtls1_preprocess_fragment(s, &frag->msg_header, max);
549
550 if (al == 0) /* no alert */
551 {
552 unsigned char *p = (unsigned char *)s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
553 memcpy(&p[frag->msg_header.frag_off],
554 frag->fragment, frag->msg_header.frag_len);
555 }
556
557 dtls1_hm_fragment_free(frag);
558 pitem_free(item);
559
560 if (al == 0) {
561 *ok = 1;
562 return frag_len;
563 }
564
565 ssl3_send_alert(s, SSL3_AL_FATAL, al);
566 s->init_num = 0;
567 *ok = 0;
568 return -1;
569 } else
570 return 0;
571}
572
573/*
574 * dtls1_max_handshake_message_len returns the maximum number of bytes
575 * permitted in a DTLS handshake message for |s|. The minimum is 16KB,
576 * but may be greater if the maximum certificate list size requires it.
577 */
578static unsigned long
579dtls1_max_handshake_message_len(const SSL *s)
580{
581 unsigned long max_len;
582
583 max_len = DTLS1_HM_HEADER_LENGTH + SSL3_RT_MAX_ENCRYPTED_LENGTH;
584 if (max_len < (unsigned long)s->max_cert_list)
585 return s->max_cert_list;
586 return max_len;
587}
588
589static int
590dtls1_reassemble_fragment(SSL *s, struct hm_header_st* msg_hdr, int *ok)
591{
592 hm_fragment *frag = NULL;
593 pitem *item = NULL;
594 int i = -1, is_complete;
595 unsigned char seq64be[8];
596 unsigned long frag_len = msg_hdr->frag_len;
597
598 if ((msg_hdr->frag_off + frag_len) > msg_hdr->msg_len ||
599 msg_hdr->msg_len > dtls1_max_handshake_message_len(s))
600 goto err;
601
602 if (frag_len == 0) {
603 i = DTLS1_HM_FRAGMENT_RETRY;
604 goto err;
605 }
606
607 /* Try to find item in queue */
608 memset(seq64be, 0, sizeof(seq64be));
609 seq64be[6] = (unsigned char)(msg_hdr->seq >> 8);
610 seq64be[7] = (unsigned char)msg_hdr->seq;
611 item = pqueue_find(s->d1->buffered_messages, seq64be);
612
613 if (item == NULL) {
614 frag = dtls1_hm_fragment_new(msg_hdr->msg_len, 1);
615 if (frag == NULL)
616 goto err;
617 memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr));
618 frag->msg_header.frag_len = frag->msg_header.msg_len;
619 frag->msg_header.frag_off = 0;
620 } else {
621 frag = (hm_fragment*)item->data;
622 if (frag->msg_header.msg_len != msg_hdr->msg_len) {
623 item = NULL;
624 frag = NULL;
625 goto err;
626 }
627 }
628
629 /*
630 * If message is already reassembled, this must be a
631 * retransmit and can be dropped.
632 */
633 if (frag->reassembly == NULL) {
634 unsigned char devnull [256];
635
636 while (frag_len) {
637 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
638 devnull, frag_len > sizeof(devnull) ?
639 sizeof(devnull) : frag_len, 0);
640 if (i <= 0)
641 goto err;
642 frag_len -= i;
643 }
644 i = DTLS1_HM_FRAGMENT_RETRY;
645 goto err;
646 }
647
648 /* read the body of the fragment (header has already been read */
649 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
650 frag->fragment + msg_hdr->frag_off, frag_len, 0);
651 if (i <= 0 || (unsigned long)i != frag_len)
652 goto err;
653
654 RSMBLY_BITMASK_MARK(frag->reassembly, (long)msg_hdr->frag_off,
655 (long)(msg_hdr->frag_off + frag_len));
656
657 RSMBLY_BITMASK_IS_COMPLETE(frag->reassembly, (long)msg_hdr->msg_len,
658 is_complete);
659
660 if (is_complete) {
661 free(frag->reassembly);
662 frag->reassembly = NULL;
663 }
664
665 if (item == NULL) {
666 memset(seq64be, 0, sizeof(seq64be));
667 seq64be[6] = (unsigned char)(msg_hdr->seq >> 8);
668 seq64be[7] = (unsigned char)(msg_hdr->seq);
669
670 item = pitem_new(seq64be, frag);
671 if (item == NULL) {
672 i = -1;
673 goto err;
674 }
675
676 pqueue_insert(s->d1->buffered_messages, item);
677 }
678
679 return DTLS1_HM_FRAGMENT_RETRY;
680
681err:
682 if (item == NULL && frag != NULL)
683 dtls1_hm_fragment_free(frag);
684 *ok = 0;
685 return i;
686}
687
688
689static int
690dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok)
691{
692 int i = -1;
693 hm_fragment *frag = NULL;
694 pitem *item = NULL;
695 unsigned char seq64be[8];
696 unsigned long frag_len = msg_hdr->frag_len;
697
698 if ((msg_hdr->frag_off + frag_len) > msg_hdr->msg_len)
699 goto err;
700
701 /* Try to find item in queue, to prevent duplicate entries */
702 memset(seq64be, 0, sizeof(seq64be));
703 seq64be[6] = (unsigned char) (msg_hdr->seq >> 8);
704 seq64be[7] = (unsigned char) msg_hdr->seq;
705 item = pqueue_find(s->d1->buffered_messages, seq64be);
706
707 /*
708 * If we already have an entry and this one is a fragment,
709 * don't discard it and rather try to reassemble it.
710 */
711 if (item != NULL && frag_len < msg_hdr->msg_len)
712 item = NULL;
713
714 /*
715 * Discard the message if sequence number was already there, is
716 * too far in the future, already in the queue or if we received
717 * a FINISHED before the SERVER_HELLO, which then must be a stale
718 * retransmit.
719 */
720 if (msg_hdr->seq <= s->d1->handshake_read_seq ||
721 msg_hdr->seq > s->d1->handshake_read_seq + 10 || item != NULL ||
722 (s->d1->handshake_read_seq == 0 &&
723 msg_hdr->type == SSL3_MT_FINISHED)) {
724 unsigned char devnull [256];
725
726 while (frag_len) {
727 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
728 devnull, frag_len > sizeof(devnull) ?
729 sizeof(devnull) : frag_len, 0);
730 if (i <= 0)
731 goto err;
732 frag_len -= i;
733 }
734 } else {
735 if (frag_len < msg_hdr->msg_len)
736 return dtls1_reassemble_fragment(s, msg_hdr, ok);
737
738 if (frag_len > dtls1_max_handshake_message_len(s))
739 goto err;
740
741 frag = dtls1_hm_fragment_new(frag_len, 0);
742 if (frag == NULL)
743 goto err;
744
745 memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr));
746
747 if (frag_len) {
748 /* read the body of the fragment (header has already been read */
749 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
750 frag->fragment, frag_len, 0);
751 if (i <= 0 || (unsigned long)i != frag_len)
752 goto err;
753 }
754
755 memset(seq64be, 0, sizeof(seq64be));
756 seq64be[6] = (unsigned char)(msg_hdr->seq >> 8);
757 seq64be[7] = (unsigned char)(msg_hdr->seq);
758
759 item = pitem_new(seq64be, frag);
760 if (item == NULL)
761 goto err;
762
763 pqueue_insert(s->d1->buffered_messages, item);
764 }
765
766 return DTLS1_HM_FRAGMENT_RETRY;
767
768err:
769 if (item == NULL && frag != NULL)
770 dtls1_hm_fragment_free(frag);
771 *ok = 0;
772 return i;
773}
774
775
776static long
777dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok)
778{
779 unsigned char wire[DTLS1_HM_HEADER_LENGTH];
780 unsigned long len, frag_off, frag_len;
781 int i, al;
782 struct hm_header_st msg_hdr;
783
784again:
785 /* see if we have the required fragment already */
786 if ((frag_len = dtls1_retrieve_buffered_fragment(s, max, ok)) || *ok) {
787 if (*ok)
788 s->init_num = frag_len;
789 return frag_len;
790 }
791
792 /* read handshake message header */
793 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, wire,
794 DTLS1_HM_HEADER_LENGTH, 0);
795 if (i <= 0) /* nbio, or an error */
796 {
797 s->rwstate = SSL_READING;
798 *ok = 0;
799 return i;
800 }
801 /* Handshake fails if message header is incomplete */
802 if (i != DTLS1_HM_HEADER_LENGTH ||
803 /* parse the message fragment header */
804 dtls1_get_message_header(wire, &msg_hdr) == 0) {
805 al = SSL_AD_UNEXPECTED_MESSAGE;
806 SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,
807 SSL_R_UNEXPECTED_MESSAGE);
808 goto f_err;
809 }
810
811 /*
812 * if this is a future (or stale) message it gets buffered
813 * (or dropped)--no further processing at this time
814 * While listening, we accept seq 1 (ClientHello with cookie)
815 * although we're still expecting seq 0 (ClientHello)
816 */
817 if (msg_hdr.seq != s->d1->handshake_read_seq &&
818 !(s->d1->listen && msg_hdr.seq == 1))
819 return dtls1_process_out_of_seq_message(s, &msg_hdr, ok);
820
821 len = msg_hdr.msg_len;
822 frag_off = msg_hdr.frag_off;
823 frag_len = msg_hdr.frag_len;
824
825 if (frag_len && frag_len < len)
826 return dtls1_reassemble_fragment(s, &msg_hdr, ok);
827
828 if (!s->server && s->d1->r_msg_hdr.frag_off == 0 &&
829 wire[0] == SSL3_MT_HELLO_REQUEST) {
830 /*
831 * The server may always send 'Hello Request' messages --
832 * we are doing a handshake anyway now, so ignore them
833 * if their format is correct. Does not count for
834 * 'Finished' MAC.
835 */
836 if (wire[1] == 0 && wire[2] == 0 && wire[3] == 0) {
837 if (s->msg_callback)
838 s->msg_callback(0, s->version,
839 SSL3_RT_HANDSHAKE, wire,
840 DTLS1_HM_HEADER_LENGTH, s,
841 s->msg_callback_arg);
842
843 s->init_num = 0;
844 goto again;
845 }
846 else /* Incorrectly formated Hello request */
847 {
848 al = SSL_AD_UNEXPECTED_MESSAGE;
849 SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,
850 SSL_R_UNEXPECTED_MESSAGE);
851 goto f_err;
852 }
853 }
854
855 if ((al = dtls1_preprocess_fragment(s, &msg_hdr, max)))
856 goto f_err;
857
858 /* XDTLS: ressurect this when restart is in place */
859 s->state = stn;
860
861 if (frag_len > 0) {
862 unsigned char *p = (unsigned char *)s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
863
864 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
865 &p[frag_off], frag_len, 0);
866 /* XDTLS: fix this--message fragments cannot span multiple packets */
867 if (i <= 0) {
868 s->rwstate = SSL_READING;
869 *ok = 0;
870 return i;
871 }
872 } else
873 i = 0;
874
875 /*
876 * XDTLS: an incorrectly formatted fragment should cause the
877 * handshake to fail
878 */
879 if (i != (int)frag_len) {
880 al = SSL3_AD_ILLEGAL_PARAMETER;
881 SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,
882 SSL3_AD_ILLEGAL_PARAMETER);
883 goto f_err;
884 }
885
886 *ok = 1;
887
888 /*
889 * Note that s->init_num is *not* used as current offset in
890 * s->init_buf->data, but as a counter summing up fragments'
891 * lengths: as soon as they sum up to handshake packet
892 * length, we assume we have got all the fragments.
893 */
894 s->init_num = frag_len;
895 return frag_len;
896
897f_err:
898 ssl3_send_alert(s, SSL3_AL_FATAL, al);
899 s->init_num = 0;
900
901 *ok = 0;
902 return (-1);
903}
904
905/*
906 * for these 2 messages, we need to
907 * ssl->enc_read_ctx re-init
908 * ssl->s3->read_sequence zero
909 * ssl->s3->read_mac_secret re-init
910 * ssl->session->read_sym_enc assign
911 * ssl->session->read_hash assign
912 */
913int
914dtls1_send_change_cipher_spec(SSL *s, int a, int b)
915{
916 unsigned char *p;
917
918 if (s->state == a) {
919 p = (unsigned char *)s->init_buf->data;
920 *p++=SSL3_MT_CCS;
921 s->d1->handshake_write_seq = s->d1->next_handshake_write_seq;
922 s->init_num = DTLS1_CCS_HEADER_LENGTH;
923
924 s->init_off = 0;
925
926 dtls1_set_message_header_int(s, SSL3_MT_CCS, 0,
927 s->d1->handshake_write_seq, 0, 0);
928
929 /* buffer the message to handle re-xmits */
930 dtls1_buffer_message(s, 1);
931
932 s->state = b;
933 }
934
935 /* SSL3_ST_CW_CHANGE_B */
936 return (dtls1_do_write(s, SSL3_RT_CHANGE_CIPHER_SPEC));
937}
938
939static int
940dtls1_add_cert_to_buf(BUF_MEM *buf, unsigned long *l, X509 *x)
941{
942 int n;
943 unsigned char *p;
944
945 n = i2d_X509(x, NULL);
946 if (!BUF_MEM_grow_clean(buf, n + (*l) + 3)) {
947 SSLerr(SSL_F_DTLS1_ADD_CERT_TO_BUF, ERR_R_BUF_LIB);
948 return 0;
949 }
950 p = (unsigned char *)&(buf->data[*l]);
951 l2n3(n, p);
952 i2d_X509(x, &p);
953 *l += n + 3;
954
955 return 1;
956}
957
958unsigned long
959dtls1_output_cert_chain(SSL *s, X509 *x)
960{
961 unsigned char *p;
962 int i;
963 unsigned long l = 3 + DTLS1_HM_HEADER_LENGTH;
964 BUF_MEM *buf;
965
966 /* TLSv1 sends a chain with nothing in it, instead of an alert */
967 buf = s->init_buf;
968 if (!BUF_MEM_grow_clean(buf, 10)) {
969 SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN, ERR_R_BUF_LIB);
970 return (0);
971 }
972 if (x != NULL) {
973 X509_STORE_CTX xs_ctx;
974
975 if (!X509_STORE_CTX_init(&xs_ctx, s->ctx->cert_store,
976 x, NULL)) {
977 SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN, ERR_R_X509_LIB);
978 return (0);
979 }
980
981 X509_verify_cert(&xs_ctx);
982 /* Don't leave errors in the queue */
983 ERR_clear_error();
984 for (i = 0; i < sk_X509_num(xs_ctx.chain); i++) {
985 x = sk_X509_value(xs_ctx.chain, i);
986
987 if (!dtls1_add_cert_to_buf(buf, &l, x)) {
988 X509_STORE_CTX_cleanup(&xs_ctx);
989 return 0;
990 }
991 }
992 X509_STORE_CTX_cleanup(&xs_ctx);
993 }
994 /* Thawte special :-) */
995 for (i = 0; i < sk_X509_num(s->ctx->extra_certs); i++) {
996 x = sk_X509_value(s->ctx->extra_certs, i);
997 if (!dtls1_add_cert_to_buf(buf, &l, x))
998 return 0;
999 }
1000
1001 l -= (3 + DTLS1_HM_HEADER_LENGTH);
1002
1003 p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1004 l2n3(l, p);
1005 l += 3;
1006 p = (unsigned char *)&(buf->data[0]);
1007 p = dtls1_set_message_header(s, p, SSL3_MT_CERTIFICATE, l, 0, l);
1008
1009 l += DTLS1_HM_HEADER_LENGTH;
1010 return (l);
1011}
1012
1013int
1014dtls1_read_failed(SSL *s, int code)
1015{
1016 if (code > 0) {
1017#ifdef DEBUG
1018 fprintf(stderr, "invalid state reached %s:%d",
1019 __FILE__, __LINE__);
1020#endif
1021 return 1;
1022 }
1023
1024 if (!dtls1_is_timer_expired(s)) {
1025 /*
1026 * not a timeout, none of our business, let higher layers
1027 * handle this. in fact it's probably an error
1028 */
1029 return code;
1030 }
1031
1032 if (!SSL_in_init(s)) /* done, no need to send a retransmit */
1033 {
1034 BIO_set_flags(SSL_get_rbio(s), BIO_FLAGS_READ);
1035 return code;
1036 }
1037
1038 return dtls1_handle_timeout(s);
1039}
1040
1041int
1042dtls1_get_queue_priority(unsigned short seq, int is_ccs)
1043{
1044 /*
1045 * The index of the retransmission queue actually is the message
1046 * sequence number, since the queue only contains messages of a
1047 * single handshake. However, the ChangeCipherSpec has no message
1048 * sequence number and so using only the sequence will result in
1049 * the CCS and Finished having the same index. To prevent this, the
1050 * sequence number is multiplied by 2. In case of a CCS 1 is
1051 * subtracted. This does not only differ CSS and Finished, it also
1052 * maintains the order of the index (important for priority queues)
1053 * and fits in the unsigned short variable.
1054 */
1055 return seq * 2 - is_ccs;
1056}
1057
1058int
1059dtls1_retransmit_buffered_messages(SSL *s)
1060{
1061 pqueue sent = s->d1->sent_messages;
1062 piterator iter;
1063 pitem *item;
1064 hm_fragment *frag;
1065 int found = 0;
1066
1067 iter = pqueue_iterator(sent);
1068
1069 for (item = pqueue_next(&iter); item != NULL;
1070 item = pqueue_next(&iter)) {
1071 frag = (hm_fragment *)item->data;
1072 if (dtls1_retransmit_message(s,
1073 (unsigned short)dtls1_get_queue_priority(
1074 frag->msg_header.seq, frag->msg_header.is_ccs), 0,
1075 &found) <= 0 && found) {
1076#ifdef DEBUG
1077 fprintf(stderr, "dtls1_retransmit_message() failed\n");
1078#endif
1079 return -1;
1080 }
1081 }
1082
1083 return 1;
1084}
1085
1086int
1087dtls1_buffer_message(SSL *s, int is_ccs)
1088{
1089 pitem *item;
1090 hm_fragment *frag;
1091 unsigned char seq64be[8];
1092
1093 /* Buffer the messsage in order to handle DTLS retransmissions. */
1094
1095 /*
1096 * This function is called immediately after a message has
1097 * been serialized
1098 */
1099 OPENSSL_assert(s->init_off == 0);
1100
1101 frag = dtls1_hm_fragment_new(s->init_num, 0);
1102 if (frag == NULL)
1103 return 0;
1104
1105 memcpy(frag->fragment, s->init_buf->data, s->init_num);
1106
1107 if (is_ccs) {
1108 OPENSSL_assert(s->d1->w_msg_hdr.msg_len +
1109 ((s->version == DTLS1_VERSION) ?
1110 DTLS1_CCS_HEADER_LENGTH : 3) == (unsigned int)s->init_num);
1111 } else {
1112 OPENSSL_assert(s->d1->w_msg_hdr.msg_len +
1113 DTLS1_HM_HEADER_LENGTH == (unsigned int)s->init_num);
1114 }
1115
1116 frag->msg_header.msg_len = s->d1->w_msg_hdr.msg_len;
1117 frag->msg_header.seq = s->d1->w_msg_hdr.seq;
1118 frag->msg_header.type = s->d1->w_msg_hdr.type;
1119 frag->msg_header.frag_off = 0;
1120 frag->msg_header.frag_len = s->d1->w_msg_hdr.msg_len;
1121 frag->msg_header.is_ccs = is_ccs;
1122
1123 /* save current state*/
1124 frag->msg_header.saved_retransmit_state.enc_write_ctx = s->enc_write_ctx;
1125 frag->msg_header.saved_retransmit_state.write_hash = s->write_hash;
1126 frag->msg_header.saved_retransmit_state.session = s->session;
1127 frag->msg_header.saved_retransmit_state.epoch = s->d1->w_epoch;
1128
1129 memset(seq64be, 0, sizeof(seq64be));
1130 seq64be[6] = (unsigned char)(dtls1_get_queue_priority(
1131 frag->msg_header.seq, frag->msg_header.is_ccs) >> 8);
1132 seq64be[7] = (unsigned char)(dtls1_get_queue_priority(
1133 frag->msg_header.seq, frag->msg_header.is_ccs));
1134
1135 item = pitem_new(seq64be, frag);
1136 if (item == NULL) {
1137 dtls1_hm_fragment_free(frag);
1138 return 0;
1139 }
1140
1141 pqueue_insert(s->d1->sent_messages, item);
1142 return 1;
1143}
1144
1145int
1146dtls1_retransmit_message(SSL *s, unsigned short seq, unsigned long frag_off,
1147 int *found)
1148{
1149 int ret;
1150 /* XDTLS: for now assuming that read/writes are blocking */
1151 pitem *item;
1152 hm_fragment *frag;
1153 unsigned long header_length;
1154 unsigned char seq64be[8];
1155 struct dtls1_retransmit_state saved_state;
1156 unsigned char save_write_sequence[8];
1157
1158 /*
1159 OPENSSL_assert(s->init_num == 0);
1160 OPENSSL_assert(s->init_off == 0);
1161 */
1162
1163 /* XDTLS: the requested message ought to be found, otherwise error */
1164 memset(seq64be, 0, sizeof(seq64be));
1165 seq64be[6] = (unsigned char)(seq >> 8);
1166 seq64be[7] = (unsigned char)seq;
1167
1168 item = pqueue_find(s->d1->sent_messages, seq64be);
1169 if (item == NULL) {
1170#ifdef DEBUG
1171 fprintf(stderr, "retransmit: message %d non-existant\n", seq);
1172#endif
1173 *found = 0;
1174 return 0;
1175 }
1176
1177 *found = 1;
1178 frag = (hm_fragment *)item->data;
1179
1180 if (frag->msg_header.is_ccs)
1181 header_length = DTLS1_CCS_HEADER_LENGTH;
1182 else
1183 header_length = DTLS1_HM_HEADER_LENGTH;
1184
1185 memcpy(s->init_buf->data, frag->fragment,
1186 frag->msg_header.msg_len + header_length);
1187 s->init_num = frag->msg_header.msg_len + header_length;
1188
1189 dtls1_set_message_header_int(s, frag->msg_header.type,
1190 frag->msg_header.msg_len, frag->msg_header.seq, 0,
1191 frag->msg_header.frag_len);
1192
1193 /* save current state */
1194 saved_state.enc_write_ctx = s->enc_write_ctx;
1195 saved_state.write_hash = s->write_hash;
1196 saved_state.session = s->session;
1197 saved_state.epoch = s->d1->w_epoch;
1198
1199 s->d1->retransmitting = 1;
1200
1201 /* restore state in which the message was originally sent */
1202 s->enc_write_ctx = frag->msg_header.saved_retransmit_state.enc_write_ctx;
1203 s->write_hash = frag->msg_header.saved_retransmit_state.write_hash;
1204 s->session = frag->msg_header.saved_retransmit_state.session;
1205 s->d1->w_epoch = frag->msg_header.saved_retransmit_state.epoch;
1206
1207 if (frag->msg_header.saved_retransmit_state.epoch ==
1208 saved_state.epoch - 1) {
1209 memcpy(save_write_sequence, s->s3->write_sequence,
1210 sizeof(s->s3->write_sequence));
1211 memcpy(s->s3->write_sequence, s->d1->last_write_sequence,
1212 sizeof(s->s3->write_sequence));
1213 }
1214
1215 ret = dtls1_do_write(s, frag->msg_header.is_ccs ?
1216 SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE);
1217
1218 /* restore current state */
1219 s->enc_write_ctx = saved_state.enc_write_ctx;
1220 s->write_hash = saved_state.write_hash;
1221 s->session = saved_state.session;
1222 s->d1->w_epoch = saved_state.epoch;
1223
1224 if (frag->msg_header.saved_retransmit_state.epoch ==
1225 saved_state.epoch - 1) {
1226 memcpy(s->d1->last_write_sequence, s->s3->write_sequence,
1227 sizeof(s->s3->write_sequence));
1228 memcpy(s->s3->write_sequence, save_write_sequence,
1229 sizeof(s->s3->write_sequence));
1230 }
1231
1232 s->d1->retransmitting = 0;
1233
1234 (void)BIO_flush(SSL_get_wbio(s));
1235 return ret;
1236}
1237
1238/* call this function when the buffered messages are no longer needed */
1239void
1240dtls1_clear_record_buffer(SSL *s)
1241{
1242 pitem *item;
1243
1244 for(item = pqueue_pop(s->d1->sent_messages); item != NULL;
1245 item = pqueue_pop(s->d1->sent_messages)) {
1246 dtls1_hm_fragment_free((hm_fragment *)item->data);
1247 pitem_free(item);
1248 }
1249}
1250
1251unsigned char *
1252dtls1_set_message_header(SSL *s, unsigned char *p, unsigned char mt,
1253 unsigned long len, unsigned long frag_off, unsigned long frag_len)
1254{
1255 /* Don't change sequence numbers while listening */
1256 if (frag_off == 0 && !s->d1->listen) {
1257 s->d1->handshake_write_seq = s->d1->next_handshake_write_seq;
1258 s->d1->next_handshake_write_seq++;
1259 }
1260
1261 dtls1_set_message_header_int(s, mt, len, s->d1->handshake_write_seq,
1262 frag_off, frag_len);
1263
1264 return p += DTLS1_HM_HEADER_LENGTH;
1265}
1266
1267/* don't actually do the writing, wait till the MTU has been retrieved */
1268static void
1269dtls1_set_message_header_int(SSL *s, unsigned char mt, unsigned long len,
1270 unsigned short seq_num, unsigned long frag_off, unsigned long frag_len)
1271{
1272 struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
1273
1274 msg_hdr->type = mt;
1275 msg_hdr->msg_len = len;
1276 msg_hdr->seq = seq_num;
1277 msg_hdr->frag_off = frag_off;
1278 msg_hdr->frag_len = frag_len;
1279}
1280
1281static void
1282dtls1_fix_message_header(SSL *s, unsigned long frag_off, unsigned long frag_len)
1283{
1284 struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
1285
1286 msg_hdr->frag_off = frag_off;
1287 msg_hdr->frag_len = frag_len;
1288}
1289
1290static unsigned char *
1291dtls1_write_message_header(SSL *s, unsigned char *p)
1292{
1293 struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
1294
1295 *p++ = msg_hdr->type;
1296 l2n3(msg_hdr->msg_len, p);
1297
1298 s2n(msg_hdr->seq, p);
1299 l2n3(msg_hdr->frag_off, p);
1300 l2n3(msg_hdr->frag_len, p);
1301
1302 return p;
1303}
1304
1305unsigned int
1306dtls1_min_mtu(void)
1307{
1308 return (g_probable_mtu[(sizeof(g_probable_mtu) /
1309 sizeof(g_probable_mtu[0])) - 1]);
1310}
1311
1312static unsigned int
1313dtls1_guess_mtu(unsigned int curr_mtu)
1314{
1315 unsigned int i;
1316
1317 if (curr_mtu == 0)
1318 return g_probable_mtu[0];
1319
1320 for (i = 0; i < sizeof(g_probable_mtu) / sizeof(g_probable_mtu[0]); i++)
1321 if (curr_mtu > g_probable_mtu[i])
1322 return g_probable_mtu[i];
1323
1324 return curr_mtu;
1325}
1326
1327int
1328dtls1_get_message_header(unsigned char *data, struct hm_header_st *msg_hdr)
1329{
1330 CBS header;
1331 uint32_t msg_len, frag_off, frag_len;
1332 uint16_t seq;
1333 uint8_t type;
1334
1335 CBS_init(&header, data, sizeof(*msg_hdr));
1336
1337 memset(msg_hdr, 0, sizeof(*msg_hdr));
1338
1339 if (!CBS_get_u8(&header, &type))
1340 return 0;
1341 if (!CBS_get_u24(&header, &msg_len))
1342 return 0;
1343 if (!CBS_get_u16(&header, &seq))
1344 return 0;
1345 if (!CBS_get_u24(&header, &frag_off))
1346 return 0;
1347 if (!CBS_get_u24(&header, &frag_len))
1348 return 0;
1349
1350 msg_hdr->type = type;
1351 msg_hdr->msg_len = msg_len;
1352 msg_hdr->seq = seq;
1353 msg_hdr->frag_off = frag_off;
1354 msg_hdr->frag_len = frag_len;
1355
1356 return 1;
1357}
1358
1359void
1360dtls1_get_ccs_header(unsigned char *data, struct ccs_header_st *ccs_hdr)
1361{
1362 memset(ccs_hdr, 0x00, sizeof(struct ccs_header_st));
1363
1364 ccs_hdr->type = *(data++);
1365}
1366
1367int
1368dtls1_shutdown(SSL *s)
1369{
1370 int ret;
1371
1372 ret = ssl3_shutdown(s);
1373 return ret;
1374}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-05-09 03:45:16 +0000