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1/* $OpenBSD: d1_both.c,v 1.32 2015/02/09 10:53:28 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 "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
129#define RSMBLY_BITMASK_SIZE(msg_len) (((msg_len) + 7) / 8)
130
131#define RSMBLY_BITMASK_MARK(bitmask, start, end) { \
132 if ((end) - (start) <= 8) { \
133 long ii; \
134 for (ii = (start); ii < (end); ii++) bitmask[((ii) >> 3)] |= (1 << ((ii) & 7)); \
135 } else { \
136 long ii; \
137 bitmask[((start) >> 3)] |= bitmask_start_values[((start) & 7)]; \
138 for (ii = (((start) >> 3) + 1); ii < ((((end) - 1)) >> 3); ii++) bitmask[ii] = 0xff; \
139 bitmask[(((end) - 1) >> 3)] |= bitmask_end_values[((end) & 7)]; \
140 } }
141
142#define RSMBLY_BITMASK_IS_COMPLETE(bitmask, msg_len, is_complete) { \
143 long ii; \
144 OPENSSL_assert((msg_len) > 0); \
145 is_complete = 1; \
146 if (bitmask[(((msg_len) - 1) >> 3)] != bitmask_end_values[((msg_len) & 7)]) is_complete = 0; \
147 if (is_complete) for (ii = (((msg_len) - 1) >> 3) - 1; ii >= 0 ; ii--) \
148 if (bitmask[ii] != 0xff) { is_complete = 0; break; } }
149
150static unsigned char bitmask_start_values[] = {
151 0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80
152};
153static unsigned char bitmask_end_values[] = {
154 0xff, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f
155};
156
157/* XDTLS: figure out the right values */
158static unsigned int g_probable_mtu[] = {1500 - 28, 512 - 28, 256 - 28};
159
160static unsigned int dtls1_guess_mtu(unsigned int curr_mtu);
161static void dtls1_fix_message_header(SSL *s, unsigned long frag_off,
162 unsigned long frag_len);
163static unsigned char *dtls1_write_message_header(SSL *s, unsigned char *p);
164static void dtls1_set_message_header_int(SSL *s, unsigned char mt,
165 unsigned long len, unsigned short seq_num, unsigned long frag_off,
166 unsigned long frag_len);
167static long dtls1_get_message_fragment(SSL *s, int st1, int stn, long max,
168 int *ok);
169
170static hm_fragment *
171dtls1_hm_fragment_new(unsigned long frag_len, int reassembly)
172{
173 hm_fragment *frag = NULL;
174 unsigned char *buf = NULL;
175 unsigned char *bitmask = NULL;
176
177 frag = malloc(sizeof(hm_fragment));
178 if (frag == NULL)
179 return NULL;
180
181 if (frag_len) {
182 buf = malloc(frag_len);
183 if (buf == NULL) {
184 free(frag);
185 return NULL;
186 }
187 }
188
189 /* zero length fragment gets zero frag->fragment */
190 frag->fragment = buf;
191
192 /* Initialize reassembly bitmask if necessary */
193 if (reassembly) {
194 bitmask = malloc(RSMBLY_BITMASK_SIZE(frag_len));
195 if (bitmask == NULL) {
196 free(buf);
197 free(frag);
198 return NULL;
199 }
200 memset(bitmask, 0, RSMBLY_BITMASK_SIZE(frag_len));
201 }
202
203 frag->reassembly = bitmask;
204
205 return frag;
206}
207
208static void
209dtls1_hm_fragment_free(hm_fragment *frag)
210{
211
212 if (frag->msg_header.is_ccs) {
213 EVP_CIPHER_CTX_free(
214 frag->msg_header.saved_retransmit_state.enc_write_ctx);
215 EVP_MD_CTX_destroy(
216 frag->msg_header.saved_retransmit_state.write_hash);
217 }
218 free(frag->fragment);
219 free(frag->reassembly);
220 free(frag);
221}
222
223/* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */
224int
225dtls1_do_write(SSL *s, int type)
226{
227 int ret;
228 int curr_mtu;
229 unsigned int len, frag_off, mac_size, blocksize;
230
231 /* AHA! Figure out the MTU, and stick to the right size */
232 if (s->d1->mtu < dtls1_min_mtu() &&
233 !(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) {
234 s->d1->mtu = BIO_ctrl(SSL_get_wbio(s),
235 BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
236
237 /*
238 * I've seen the kernel return bogus numbers when it
239 * doesn't know the MTU (ie., the initial write), so just
240 * make sure we have a reasonable number
241 */
242 if (s->d1->mtu < dtls1_min_mtu()) {
243 s->d1->mtu = 0;
244 s->d1->mtu = dtls1_guess_mtu(s->d1->mtu);
245 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SET_MTU,
246 s->d1->mtu, NULL);
247 }
248 }
249
250 OPENSSL_assert(s->d1->mtu >= dtls1_min_mtu());
251 /* should have something reasonable now */
252
253 if (s->init_off == 0 && type == SSL3_RT_HANDSHAKE)
254 OPENSSL_assert(s->init_num ==
255 (int)s->d1->w_msg_hdr.msg_len + DTLS1_HM_HEADER_LENGTH);
256
257 if (s->write_hash)
258 mac_size = EVP_MD_CTX_size(s->write_hash);
259 else
260 mac_size = 0;
261
262 if (s->enc_write_ctx &&
263 (EVP_CIPHER_mode( s->enc_write_ctx->cipher) & EVP_CIPH_CBC_MODE))
264 blocksize = 2 * EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
265 else
266 blocksize = 0;
267
268 frag_off = 0;
269 while (s->init_num) {
270 curr_mtu = s->d1->mtu - BIO_wpending(SSL_get_wbio(s)) -
271 DTLS1_RT_HEADER_LENGTH - mac_size - blocksize;
272
273 if (curr_mtu <= DTLS1_HM_HEADER_LENGTH) {
274 /* grr.. we could get an error if MTU picked was wrong */
275 ret = BIO_flush(SSL_get_wbio(s));
276 if (ret <= 0)
277 return ret;
278 curr_mtu = s->d1->mtu - DTLS1_RT_HEADER_LENGTH -
279 mac_size - blocksize;
280 }
281
282 if (s->init_num > curr_mtu)
283 len = curr_mtu;
284 else
285 len = s->init_num;
286
287
288 /* XDTLS: this function is too long. split out the CCS part */
289 if (type == SSL3_RT_HANDSHAKE) {
290 if (s->init_off != 0) {
291 OPENSSL_assert(s->init_off > DTLS1_HM_HEADER_LENGTH);
292 s->init_off -= DTLS1_HM_HEADER_LENGTH;
293 s->init_num += DTLS1_HM_HEADER_LENGTH;
294
295 if (s->init_num > curr_mtu)
296 len = curr_mtu;
297 else
298 len = s->init_num;
299 }
300
301 dtls1_fix_message_header(s, frag_off,
302 len - DTLS1_HM_HEADER_LENGTH);
303
304 dtls1_write_message_header(s,
305 (unsigned char *)&s->init_buf->data[s->init_off]);
306
307 OPENSSL_assert(len >= DTLS1_HM_HEADER_LENGTH);
308 }
309
310 ret = dtls1_write_bytes(s, type,
311 &s->init_buf->data[s->init_off], len);
312 if (ret < 0) {
313 /*
314 * Might need to update MTU here, but we don't know
315 * which previous packet caused the failure -- so
316 * can't really retransmit anything. continue as
317 * if everything is fine and wait for an alert to
318 * handle the retransmit
319 */
320 if (BIO_ctrl(SSL_get_wbio(s),
321 BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL) > 0)
322 s->d1->mtu = BIO_ctrl(SSL_get_wbio(s),
323 BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
324 else
325 return (-1);
326 } else {
327
328 /*
329 * Bad if this assert fails, only part of the
330 * handshake message got sent. but why would
331 * this happen?
332 */
333 OPENSSL_assert(len == (unsigned int)ret);
334
335 if (type == SSL3_RT_HANDSHAKE &&
336 !s->d1->retransmitting) {
337 /*
338 * Should not be done for 'Hello Request's,
339 * but in that case we'll ignore the result
340 * anyway
341 */
342 unsigned char *p = (unsigned char *)&s->init_buf->data[s->init_off];
343 const struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
344 int xlen;
345
346 if (frag_off == 0 &&
347 s->version != DTLS1_BAD_VER) {
348 /*
349 * Reconstruct message header is if it
350 * is being sent in single fragment
351 */
352 *p++ = msg_hdr->type;
353 l2n3(msg_hdr->msg_len, p);
354 s2n (msg_hdr->seq, p);
355 l2n3(0, p);
356 l2n3(msg_hdr->msg_len, p);
357 p -= DTLS1_HM_HEADER_LENGTH;
358 xlen = ret;
359 } else {
360 p += DTLS1_HM_HEADER_LENGTH;
361 xlen = ret - DTLS1_HM_HEADER_LENGTH;
362 }
363
364 ssl3_finish_mac(s, p, xlen);
365 }
366
367 if (ret == s->init_num) {
368 if (s->msg_callback)
369 s->msg_callback(1, s->version, type,
370 s->init_buf->data,
371 (size_t)(s->init_off + s->init_num),
372 s, s->msg_callback_arg);
373
374 s->init_off = 0;
375 /* done writing this message */
376 s->init_num = 0;
377
378 return (1);
379 }
380 s->init_off += ret;
381 s->init_num -= ret;
382 frag_off += (ret -= DTLS1_HM_HEADER_LENGTH);
383 }
384 }
385 return (0);
386}
387
388
389/*
390 * Obtain handshake message of message type 'mt' (any if mt == -1),
391 * maximum acceptable body length 'max'.
392 * Read an entire handshake message. Handshake messages arrive in
393 * fragments.
394 */
395long
396dtls1_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
397{
398 int i, al;
399 struct hm_header_st *msg_hdr;
400 unsigned char *p;
401 unsigned long msg_len;
402
403 /*
404 * s3->tmp is used to store messages that are unexpected, caused
405 * by the absence of an optional handshake message
406 */
407 if (s->s3->tmp.reuse_message) {
408 s->s3->tmp.reuse_message = 0;
409 if ((mt >= 0) && (s->s3->tmp.message_type != mt)) {
410 al = SSL_AD_UNEXPECTED_MESSAGE;
411 SSLerr(SSL_F_DTLS1_GET_MESSAGE,
412 SSL_R_UNEXPECTED_MESSAGE);
413 goto f_err;
414 }
415 *ok = 1;
416 s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
417 s->init_num = (int)s->s3->tmp.message_size;
418 return s->init_num;
419 }
420
421 msg_hdr = &s->d1->r_msg_hdr;
422 memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
423
424again:
425 i = dtls1_get_message_fragment(s, st1, stn, max, ok);
426 if (i == DTLS1_HM_BAD_FRAGMENT ||
427 i == DTLS1_HM_FRAGMENT_RETRY) /* bad fragment received */
428 goto again;
429 else if (i <= 0 && !*ok)
430 return i;
431
432 p = (unsigned char *)s->init_buf->data;
433 msg_len = msg_hdr->msg_len;
434
435 /* reconstruct message header */
436 *(p++) = msg_hdr->type;
437 l2n3(msg_len, p);
438 s2n (msg_hdr->seq, p);
439 l2n3(0, p);
440 l2n3(msg_len, p);
441 if (s->version != DTLS1_BAD_VER) {
442 p -= DTLS1_HM_HEADER_LENGTH;
443 msg_len += DTLS1_HM_HEADER_LENGTH;
444 }
445
446 ssl3_finish_mac(s, p, msg_len);
447 if (s->msg_callback)
448 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, p, msg_len,
449 s, s->msg_callback_arg);
450
451 memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
452
453 /* Don't change sequence numbers while listening */
454 if (!s->d1->listen)
455 s->d1->handshake_read_seq++;
456
457 s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
458 return s->init_num;
459
460f_err:
461 ssl3_send_alert(s, SSL3_AL_FATAL, al);
462 *ok = 0;
463 return -1;
464}
465
466
467static int
468dtls1_preprocess_fragment(SSL *s, struct hm_header_st *msg_hdr, int max)
469{
470 size_t frag_off, frag_len, msg_len;
471
472 msg_len = msg_hdr->msg_len;
473 frag_off = msg_hdr->frag_off;
474 frag_len = msg_hdr->frag_len;
475
476 /* sanity checking */
477 if ((frag_off + frag_len) > msg_len) {
478 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,
479 SSL_R_EXCESSIVE_MESSAGE_SIZE);
480 return SSL_AD_ILLEGAL_PARAMETER;
481 }
482
483 if ((frag_off + frag_len) > (unsigned long)max) {
484 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,
485 SSL_R_EXCESSIVE_MESSAGE_SIZE);
486 return SSL_AD_ILLEGAL_PARAMETER;
487 }
488
489 if ( s->d1->r_msg_hdr.frag_off == 0) /* first fragment */
490 {
491 /*
492 * msg_len is limited to 2^24, but is effectively checked
493 * against max above
494 */
495 if (!BUF_MEM_grow_clean(s->init_buf,
496 msg_len + DTLS1_HM_HEADER_LENGTH)) {
497 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT, ERR_R_BUF_LIB);
498 return SSL_AD_INTERNAL_ERROR;
499 }
500
501 s->s3->tmp.message_size = msg_len;
502 s->d1->r_msg_hdr.msg_len = msg_len;
503 s->s3->tmp.message_type = msg_hdr->type;
504 s->d1->r_msg_hdr.type = msg_hdr->type;
505 s->d1->r_msg_hdr.seq = msg_hdr->seq;
506 } else if (msg_len != s->d1->r_msg_hdr.msg_len) {
507 /*
508 * They must be playing with us! BTW, failure to enforce
509 * upper limit would open possibility for buffer overrun.
510 */
511 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,
512 SSL_R_EXCESSIVE_MESSAGE_SIZE);
513 return SSL_AD_ILLEGAL_PARAMETER;
514 }
515
516 return 0; /* no error */
517}
518
519static int
520dtls1_retrieve_buffered_fragment(SSL *s, long max, int *ok)
521{
522 /*
523 * (0) check whether the desired fragment is available
524 * if so:
525 * (1) copy over the fragment to s->init_buf->data[]
526 * (2) update s->init_num
527 */
528 pitem *item;
529 hm_fragment *frag;
530 int al;
531
532 *ok = 0;
533 item = pqueue_peek(s->d1->buffered_messages);
534 if (item == NULL)
535 return 0;
536
537 frag = (hm_fragment *)item->data;
538
539 /* Don't return if reassembly still in progress */
540 if (frag->reassembly != NULL)
541 return 0;
542
543 if (s->d1->handshake_read_seq == frag->msg_header.seq) {
544 unsigned long frag_len = frag->msg_header.frag_len;
545 pqueue_pop(s->d1->buffered_messages);
546
547 al = dtls1_preprocess_fragment(s, &frag->msg_header, max);
548
549 if (al == 0) /* no alert */
550 {
551 unsigned char *p = (unsigned char *)s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
552 memcpy(&p[frag->msg_header.frag_off],
553 frag->fragment, frag->msg_header.frag_len);
554 }
555
556 dtls1_hm_fragment_free(frag);
557 pitem_free(item);
558
559 if (al == 0) {
560 *ok = 1;
561 return frag_len;
562 }
563
564 ssl3_send_alert(s, SSL3_AL_FATAL, al);
565 s->init_num = 0;
566 *ok = 0;
567 return -1;
568 } else
569 return 0;
570}
571
572/*
573 * dtls1_max_handshake_message_len returns the maximum number of bytes
574 * permitted in a DTLS handshake message for |s|. The minimum is 16KB,
575 * but may be greater if the maximum certificate list size requires it.
576 */
577static unsigned long
578dtls1_max_handshake_message_len(const SSL *s)
579{
580 unsigned long max_len;
581
582 max_len = DTLS1_HM_HEADER_LENGTH + SSL3_RT_MAX_ENCRYPTED_LENGTH;
583 if (max_len < (unsigned long)s->max_cert_list)
584 return s->max_cert_list;
585 return max_len;
586}
587
588static int
589dtls1_reassemble_fragment(SSL *s, struct hm_header_st* msg_hdr, int *ok)
590{
591 hm_fragment *frag = NULL;
592 pitem *item = NULL;
593 int i = -1, is_complete;
594 unsigned char seq64be[8];
595 unsigned long frag_len = msg_hdr->frag_len;
596
597 if ((msg_hdr->frag_off + frag_len) > msg_hdr->msg_len ||
598 msg_hdr->msg_len > dtls1_max_handshake_message_len(s))
599 goto err;
600
601 if (frag_len == 0) {
602 i = DTLS1_HM_FRAGMENT_RETRY;
603 goto err;
604 }
605
606 /* Try to find item in queue */
607 memset(seq64be, 0, sizeof(seq64be));
608 seq64be[6] = (unsigned char)(msg_hdr->seq >> 8);
609 seq64be[7] = (unsigned char)msg_hdr->seq;
610 item = pqueue_find(s->d1->buffered_messages, seq64be);
611
612 if (item == NULL) {
613 frag = dtls1_hm_fragment_new(msg_hdr->msg_len, 1);
614 if (frag == NULL)
615 goto err;
616 memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr));
617 frag->msg_header.frag_len = frag->msg_header.msg_len;
618 frag->msg_header.frag_off = 0;
619 } else {
620 frag = (hm_fragment*)item->data;
621 if (frag->msg_header.msg_len != msg_hdr->msg_len) {
622 item = NULL;
623 frag = NULL;
624 goto err;
625 }
626 }
627
628 /*
629 * If message is already reassembled, this must be a
630 * retransmit and can be dropped.
631 */
632 if (frag->reassembly == NULL) {
633 unsigned char devnull [256];
634
635 while (frag_len) {
636 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
637 devnull, frag_len > sizeof(devnull) ?
638 sizeof(devnull) : frag_len, 0);
639 if (i <= 0)
640 goto err;
641 frag_len -= i;
642 }
643 i = DTLS1_HM_FRAGMENT_RETRY;
644 goto err;
645 }
646
647 /* read the body of the fragment (header has already been read */
648 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
649 frag->fragment + msg_hdr->frag_off, frag_len, 0);
650 if (i <= 0 || (unsigned long)i != frag_len)
651 goto err;
652
653 RSMBLY_BITMASK_MARK(frag->reassembly, (long)msg_hdr->frag_off,
654 (long)(msg_hdr->frag_off + frag_len));
655
656 RSMBLY_BITMASK_IS_COMPLETE(frag->reassembly, (long)msg_hdr->msg_len,
657 is_complete);
658
659 if (is_complete) {
660 free(frag->reassembly);
661 frag->reassembly = NULL;
662 }
663
664 if (item == NULL) {
665 memset(seq64be, 0, sizeof(seq64be));
666 seq64be[6] = (unsigned char)(msg_hdr->seq >> 8);
667 seq64be[7] = (unsigned char)(msg_hdr->seq);
668
669 item = pitem_new(seq64be, frag);
670 if (item == NULL) {
671 i = -1;
672 goto err;
673 }
674
675 pqueue_insert(s->d1->buffered_messages, item);
676 }
677
678 return DTLS1_HM_FRAGMENT_RETRY;
679
680err:
681 if (item == NULL && frag != NULL)
682 dtls1_hm_fragment_free(frag);
683 *ok = 0;
684 return i;
685}
686
687
688static int
689dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok)
690{
691 int i = -1;
692 hm_fragment *frag = NULL;
693 pitem *item = NULL;
694 unsigned char seq64be[8];
695 unsigned long frag_len = msg_hdr->frag_len;
696
697 if ((msg_hdr->frag_off + frag_len) > msg_hdr->msg_len)
698 goto err;
699
700 /* Try to find item in queue, to prevent duplicate entries */
701 memset(seq64be, 0, sizeof(seq64be));
702 seq64be[6] = (unsigned char) (msg_hdr->seq >> 8);
703 seq64be[7] = (unsigned char) msg_hdr->seq;
704 item = pqueue_find(s->d1->buffered_messages, seq64be);
705
706 /*
707 * If we already have an entry and this one is a fragment,
708 * don't discard it and rather try to reassemble it.
709 */
710 if (item != NULL && frag_len < msg_hdr->msg_len)
711 item = NULL;
712
713 /*
714 * Discard the message if sequence number was already there, is
715 * too far in the future, already in the queue or if we received
716 * a FINISHED before the SERVER_HELLO, which then must be a stale
717 * retransmit.
718 */
719 if (msg_hdr->seq <= s->d1->handshake_read_seq ||
720 msg_hdr->seq > s->d1->handshake_read_seq + 10 || item != NULL ||
721 (s->d1->handshake_read_seq == 0 &&
722 msg_hdr->type == SSL3_MT_FINISHED)) {
723 unsigned char devnull [256];
724
725 while (frag_len) {
726 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
727 devnull, frag_len > sizeof(devnull) ?
728 sizeof(devnull) : frag_len, 0);
729 if (i <= 0)
730 goto err;
731 frag_len -= i;
732 }
733 } else {
734 if (frag_len < msg_hdr->msg_len)
735 return dtls1_reassemble_fragment(s, msg_hdr, ok);
736
737 if (frag_len > dtls1_max_handshake_message_len(s))
738 goto err;
739
740 frag = dtls1_hm_fragment_new(frag_len, 0);
741 if (frag == NULL)
742 goto err;
743
744 memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr));
745
746 if (frag_len) {
747 /* read the body of the fragment (header has already been read */
748 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
749 frag->fragment, frag_len, 0);
750 if (i <= 0 || (unsigned long)i != frag_len)
751 goto err;
752 }
753
754 memset(seq64be, 0, sizeof(seq64be));
755 seq64be[6] = (unsigned char)(msg_hdr->seq >> 8);
756 seq64be[7] = (unsigned char)(msg_hdr->seq);
757
758 item = pitem_new(seq64be, frag);
759 if (item == NULL)
760 goto err;
761
762 pqueue_insert(s->d1->buffered_messages, item);
763 }
764
765 return DTLS1_HM_FRAGMENT_RETRY;
766
767err:
768 if (item == NULL && frag != NULL)
769 dtls1_hm_fragment_free(frag);
770 *ok = 0;
771 return i;
772}
773
774
775static long
776dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok)
777{
778 unsigned char wire[DTLS1_HM_HEADER_LENGTH];
779 unsigned long len, frag_off, frag_len;
780 int i, al;
781 struct hm_header_st msg_hdr;
782
783again:
784 /* see if we have the required fragment already */
785 if ((frag_len = dtls1_retrieve_buffered_fragment(s, max, ok)) || *ok) {
786 if (*ok)
787 s->init_num = frag_len;
788 return frag_len;
789 }
790
791 /* read handshake message header */
792 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, wire,
793 DTLS1_HM_HEADER_LENGTH, 0);
794 if (i <= 0) /* nbio, or an error */
795 {
796 s->rwstate = SSL_READING;
797 *ok = 0;
798 return i;
799 }
800 /* Handshake fails if message header is incomplete */
801 if (i != DTLS1_HM_HEADER_LENGTH) {
802 al = SSL_AD_UNEXPECTED_MESSAGE;
803 SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,
804 SSL_R_UNEXPECTED_MESSAGE);
805 goto f_err;
806 }
807
808 /* parse the message fragment header */
809 dtls1_get_message_header(wire, &msg_hdr);
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
905int
906dtls1_send_finished(SSL *s, int a, int b, const char *sender, int slen)
907{
908 unsigned char *p, *d;
909 int i;
910 unsigned long l;
911
912 if (s->state == a) {
913 d = (unsigned char *)s->init_buf->data;
914 p = &(d[DTLS1_HM_HEADER_LENGTH]);
915
916 i = s->method->ssl3_enc->final_finish_mac(s, sender, slen,
917 s->s3->tmp.finish_md);
918 s->s3->tmp.finish_md_len = i;
919 memcpy(p, s->s3->tmp.finish_md, i);
920 p += i;
921 l = i;
922
923 /*
924 * Copy the finished so we can use it for
925 * renegotiation checks
926 */
927 if (s->type == SSL_ST_CONNECT) {
928 OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
929 memcpy(s->s3->previous_client_finished,
930 s->s3->tmp.finish_md, i);
931 s->s3->previous_client_finished_len = i;
932 } else {
933 OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
934 memcpy(s->s3->previous_server_finished,
935 s->s3->tmp.finish_md, i);
936 s->s3->previous_server_finished_len = i;
937 }
938
939 d = dtls1_set_message_header(s, d, SSL3_MT_FINISHED, l, 0, l);
940 s->init_num = (int)l + DTLS1_HM_HEADER_LENGTH;
941 s->init_off = 0;
942
943 /* buffer the message to handle re-xmits */
944 dtls1_buffer_message(s, 0);
945
946 s->state = b;
947 }
948
949 /* SSL3_ST_SEND_xxxxxx_HELLO_B */
950 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
951}
952
953/*
954 * for these 2 messages, we need to
955 * ssl->enc_read_ctx re-init
956 * ssl->s3->read_sequence zero
957 * ssl->s3->read_mac_secret re-init
958 * ssl->session->read_sym_enc assign
959 * ssl->session->read_hash assign
960 */
961int
962dtls1_send_change_cipher_spec(SSL *s, int a, int b)
963{
964 unsigned char *p;
965
966 if (s->state == a) {
967 p = (unsigned char *)s->init_buf->data;
968 *p++=SSL3_MT_CCS;
969 s->d1->handshake_write_seq = s->d1->next_handshake_write_seq;
970 s->init_num = DTLS1_CCS_HEADER_LENGTH;
971
972 if (s->version == DTLS1_BAD_VER) {
973 s->d1->next_handshake_write_seq++;
974 s2n(s->d1->handshake_write_seq, p);
975 s->init_num += 2;
976 }
977
978 s->init_off = 0;
979
980 dtls1_set_message_header_int(s, SSL3_MT_CCS, 0,
981 s->d1->handshake_write_seq, 0, 0);
982
983 /* buffer the message to handle re-xmits */
984 dtls1_buffer_message(s, 1);
985
986 s->state = b;
987 }
988
989 /* SSL3_ST_CW_CHANGE_B */
990 return (dtls1_do_write(s, SSL3_RT_CHANGE_CIPHER_SPEC));
991}
992
993static int
994dtls1_add_cert_to_buf(BUF_MEM *buf, unsigned long *l, X509 *x)
995{
996 int n;
997 unsigned char *p;
998
999 n = i2d_X509(x, NULL);
1000 if (!BUF_MEM_grow_clean(buf, n + (*l) + 3)) {
1001 SSLerr(SSL_F_DTLS1_ADD_CERT_TO_BUF, ERR_R_BUF_LIB);
1002 return 0;
1003 }
1004 p = (unsigned char *)&(buf->data[*l]);
1005 l2n3(n, p);
1006 i2d_X509(x, &p);
1007 *l += n + 3;
1008
1009 return 1;
1010}
1011
1012unsigned long
1013dtls1_output_cert_chain(SSL *s, X509 *x)
1014{
1015 unsigned char *p;
1016 int i;
1017 unsigned long l = 3 + DTLS1_HM_HEADER_LENGTH;
1018 BUF_MEM *buf;
1019
1020 /* TLSv1 sends a chain with nothing in it, instead of an alert */
1021 buf = s->init_buf;
1022 if (!BUF_MEM_grow_clean(buf, 10)) {
1023 SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN, ERR_R_BUF_LIB);
1024 return (0);
1025 }
1026 if (x != NULL) {
1027 X509_STORE_CTX xs_ctx;
1028
1029 if (!X509_STORE_CTX_init(&xs_ctx, s->ctx->cert_store,
1030 x, NULL)) {
1031 SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN, ERR_R_X509_LIB);
1032 return (0);
1033 }
1034
1035 X509_verify_cert(&xs_ctx);
1036 /* Don't leave errors in the queue */
1037 ERR_clear_error();
1038 for (i = 0; i < sk_X509_num(xs_ctx.chain); i++) {
1039 x = sk_X509_value(xs_ctx.chain, i);
1040
1041 if (!dtls1_add_cert_to_buf(buf, &l, x)) {
1042 X509_STORE_CTX_cleanup(&xs_ctx);
1043 return 0;
1044 }
1045 }
1046 X509_STORE_CTX_cleanup(&xs_ctx);
1047 }
1048 /* Thawte special :-) */
1049 for (i = 0; i < sk_X509_num(s->ctx->extra_certs); i++) {
1050 x = sk_X509_value(s->ctx->extra_certs, i);
1051 if (!dtls1_add_cert_to_buf(buf, &l, x))
1052 return 0;
1053 }
1054
1055 l -= (3 + DTLS1_HM_HEADER_LENGTH);
1056
1057 p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1058 l2n3(l, p);
1059 l += 3;
1060 p = (unsigned char *)&(buf->data[0]);
1061 p = dtls1_set_message_header(s, p, SSL3_MT_CERTIFICATE, l, 0, l);
1062
1063 l += DTLS1_HM_HEADER_LENGTH;
1064 return (l);
1065}
1066
1067int
1068dtls1_read_failed(SSL *s, int code)
1069{
1070 if (code > 0) {
1071 fprintf(stderr, "invalid state reached %s:%d",
1072 __FILE__, __LINE__);
1073 return 1;
1074 }
1075
1076 if (!dtls1_is_timer_expired(s)) {
1077 /*
1078 * not a timeout, none of our business, let higher layers
1079 * handle this. in fact it's probably an error
1080 */
1081 return code;
1082 }
1083
1084 if (!SSL_in_init(s)) /* done, no need to send a retransmit */
1085 {
1086 BIO_set_flags(SSL_get_rbio(s), BIO_FLAGS_READ);
1087 return code;
1088 }
1089
1090 return dtls1_handle_timeout(s);
1091}
1092
1093int
1094dtls1_get_queue_priority(unsigned short seq, int is_ccs)
1095{
1096 /*
1097 * The index of the retransmission queue actually is the message
1098 * sequence number, since the queue only contains messages of a
1099 * single handshake. However, the ChangeCipherSpec has no message
1100 * sequence number and so using only the sequence will result in
1101 * the CCS and Finished having the same index. To prevent this, the
1102 * sequence number is multiplied by 2. In case of a CCS 1 is
1103 * subtracted. This does not only differ CSS and Finished, it also
1104 * maintains the order of the index (important for priority queues)
1105 * and fits in the unsigned short variable.
1106 */
1107 return seq * 2 - is_ccs;
1108}
1109
1110int
1111dtls1_retransmit_buffered_messages(SSL *s)
1112{
1113 pqueue sent = s->d1->sent_messages;
1114 piterator iter;
1115 pitem *item;
1116 hm_fragment *frag;
1117 int found = 0;
1118
1119 iter = pqueue_iterator(sent);
1120
1121 for (item = pqueue_next(&iter); item != NULL;
1122 item = pqueue_next(&iter)) {
1123 frag = (hm_fragment *)item->data;
1124 if (dtls1_retransmit_message(s,
1125 (unsigned short)dtls1_get_queue_priority(
1126 frag->msg_header.seq, frag->msg_header.is_ccs), 0,
1127 &found) <= 0 && found) {
1128 fprintf(stderr, "dtls1_retransmit_message() failed\n");
1129 return -1;
1130 }
1131 }
1132
1133 return 1;
1134}
1135
1136int
1137dtls1_buffer_message(SSL *s, int is_ccs)
1138{
1139 pitem *item;
1140 hm_fragment *frag;
1141 unsigned char seq64be[8];
1142
1143 /* Buffer the messsage in order to handle DTLS retransmissions. */
1144
1145 /*
1146 * This function is called immediately after a message has
1147 * been serialized
1148 */
1149 OPENSSL_assert(s->init_off == 0);
1150
1151 frag = dtls1_hm_fragment_new(s->init_num, 0);
1152 if (frag == NULL)
1153 return 0;
1154
1155 memcpy(frag->fragment, s->init_buf->data, s->init_num);
1156
1157 if (is_ccs) {
1158 OPENSSL_assert(s->d1->w_msg_hdr.msg_len +
1159 ((s->version == DTLS1_VERSION) ?
1160 DTLS1_CCS_HEADER_LENGTH : 3) == (unsigned int)s->init_num);
1161 } else {
1162 OPENSSL_assert(s->d1->w_msg_hdr.msg_len +
1163 DTLS1_HM_HEADER_LENGTH == (unsigned int)s->init_num);
1164 }
1165
1166 frag->msg_header.msg_len = s->d1->w_msg_hdr.msg_len;
1167 frag->msg_header.seq = s->d1->w_msg_hdr.seq;
1168 frag->msg_header.type = s->d1->w_msg_hdr.type;
1169 frag->msg_header.frag_off = 0;
1170 frag->msg_header.frag_len = s->d1->w_msg_hdr.msg_len;
1171 frag->msg_header.is_ccs = is_ccs;
1172
1173 /* save current state*/
1174 frag->msg_header.saved_retransmit_state.enc_write_ctx = s->enc_write_ctx;
1175 frag->msg_header.saved_retransmit_state.write_hash = s->write_hash;
1176 frag->msg_header.saved_retransmit_state.session = s->session;
1177 frag->msg_header.saved_retransmit_state.epoch = s->d1->w_epoch;
1178
1179 memset(seq64be, 0, sizeof(seq64be));
1180 seq64be[6] = (unsigned char)(dtls1_get_queue_priority(
1181 frag->msg_header.seq, frag->msg_header.is_ccs) >> 8);
1182 seq64be[7] = (unsigned char)(dtls1_get_queue_priority(
1183 frag->msg_header.seq, frag->msg_header.is_ccs));
1184
1185 item = pitem_new(seq64be, frag);
1186 if (item == NULL) {
1187 dtls1_hm_fragment_free(frag);
1188 return 0;
1189 }
1190
1191 pqueue_insert(s->d1->sent_messages, item);
1192 return 1;
1193}
1194
1195int
1196dtls1_retransmit_message(SSL *s, unsigned short seq, unsigned long frag_off,
1197 int *found)
1198{
1199 int ret;
1200 /* XDTLS: for now assuming that read/writes are blocking */
1201 pitem *item;
1202 hm_fragment *frag;
1203 unsigned long header_length;
1204 unsigned char seq64be[8];
1205 struct dtls1_retransmit_state saved_state;
1206 unsigned char save_write_sequence[8];
1207
1208 /*
1209 OPENSSL_assert(s->init_num == 0);
1210 OPENSSL_assert(s->init_off == 0);
1211 */
1212
1213 /* XDTLS: the requested message ought to be found, otherwise error */
1214 memset(seq64be, 0, sizeof(seq64be));
1215 seq64be[6] = (unsigned char)(seq >> 8);
1216 seq64be[7] = (unsigned char)seq;
1217
1218 item = pqueue_find(s->d1->sent_messages, seq64be);
1219 if (item == NULL) {
1220 fprintf(stderr, "retransmit: message %d non-existant\n", seq);
1221 *found = 0;
1222 return 0;
1223 }
1224
1225 *found = 1;
1226 frag = (hm_fragment *)item->data;
1227
1228 if (frag->msg_header.is_ccs)
1229 header_length = DTLS1_CCS_HEADER_LENGTH;
1230 else
1231 header_length = DTLS1_HM_HEADER_LENGTH;
1232
1233 memcpy(s->init_buf->data, frag->fragment,
1234 frag->msg_header.msg_len + header_length);
1235 s->init_num = frag->msg_header.msg_len + header_length;
1236
1237 dtls1_set_message_header_int(s, frag->msg_header.type,
1238 frag->msg_header.msg_len, frag->msg_header.seq, 0,
1239 frag->msg_header.frag_len);
1240
1241 /* save current state */
1242 saved_state.enc_write_ctx = s->enc_write_ctx;
1243 saved_state.write_hash = s->write_hash;
1244 saved_state.session = s->session;
1245 saved_state.epoch = s->d1->w_epoch;
1246
1247 s->d1->retransmitting = 1;
1248
1249 /* restore state in which the message was originally sent */
1250 s->enc_write_ctx = frag->msg_header.saved_retransmit_state.enc_write_ctx;
1251 s->write_hash = frag->msg_header.saved_retransmit_state.write_hash;
1252 s->session = frag->msg_header.saved_retransmit_state.session;
1253 s->d1->w_epoch = frag->msg_header.saved_retransmit_state.epoch;
1254
1255 if (frag->msg_header.saved_retransmit_state.epoch ==
1256 saved_state.epoch - 1) {
1257 memcpy(save_write_sequence, s->s3->write_sequence,
1258 sizeof(s->s3->write_sequence));
1259 memcpy(s->s3->write_sequence, s->d1->last_write_sequence,
1260 sizeof(s->s3->write_sequence));
1261 }
1262
1263 ret = dtls1_do_write(s, frag->msg_header.is_ccs ?
1264 SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE);
1265
1266 /* restore current state */
1267 s->enc_write_ctx = saved_state.enc_write_ctx;
1268 s->write_hash = saved_state.write_hash;
1269 s->session = saved_state.session;
1270 s->d1->w_epoch = saved_state.epoch;
1271
1272 if (frag->msg_header.saved_retransmit_state.epoch ==
1273 saved_state.epoch - 1) {
1274 memcpy(s->d1->last_write_sequence, s->s3->write_sequence,
1275 sizeof(s->s3->write_sequence));
1276 memcpy(s->s3->write_sequence, save_write_sequence,
1277 sizeof(s->s3->write_sequence));
1278 }
1279
1280 s->d1->retransmitting = 0;
1281
1282 (void)BIO_flush(SSL_get_wbio(s));
1283 return ret;
1284}
1285
1286/* call this function when the buffered messages are no longer needed */
1287void
1288dtls1_clear_record_buffer(SSL *s)
1289{
1290 pitem *item;
1291
1292 for(item = pqueue_pop(s->d1->sent_messages); item != NULL;
1293 item = pqueue_pop(s->d1->sent_messages)) {
1294 dtls1_hm_fragment_free((hm_fragment *)item->data);
1295 pitem_free(item);
1296 }
1297}
1298
1299unsigned char *
1300dtls1_set_message_header(SSL *s, unsigned char *p, unsigned char mt,
1301 unsigned long len, unsigned long frag_off, unsigned long frag_len)
1302{
1303 /* Don't change sequence numbers while listening */
1304 if (frag_off == 0 && !s->d1->listen) {
1305 s->d1->handshake_write_seq = s->d1->next_handshake_write_seq;
1306 s->d1->next_handshake_write_seq++;
1307 }
1308
1309 dtls1_set_message_header_int(s, mt, len, s->d1->handshake_write_seq,
1310 frag_off, frag_len);
1311
1312 return p += DTLS1_HM_HEADER_LENGTH;
1313}
1314
1315/* don't actually do the writing, wait till the MTU has been retrieved */
1316static void
1317dtls1_set_message_header_int(SSL *s, unsigned char mt, unsigned long len,
1318 unsigned short seq_num, unsigned long frag_off, unsigned long frag_len)
1319{
1320 struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
1321
1322 msg_hdr->type = mt;
1323 msg_hdr->msg_len = len;
1324 msg_hdr->seq = seq_num;
1325 msg_hdr->frag_off = frag_off;
1326 msg_hdr->frag_len = frag_len;
1327}
1328
1329static void
1330dtls1_fix_message_header(SSL *s, unsigned long frag_off, unsigned long frag_len)
1331{
1332 struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
1333
1334 msg_hdr->frag_off = frag_off;
1335 msg_hdr->frag_len = frag_len;
1336}
1337
1338static unsigned char *
1339dtls1_write_message_header(SSL *s, unsigned char *p)
1340{
1341 struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
1342
1343 *p++ = msg_hdr->type;
1344 l2n3(msg_hdr->msg_len, p);
1345
1346 s2n(msg_hdr->seq, p);
1347 l2n3(msg_hdr->frag_off, p);
1348 l2n3(msg_hdr->frag_len, p);
1349
1350 return p;
1351}
1352
1353unsigned int
1354dtls1_min_mtu(void)
1355{
1356 return (g_probable_mtu[(sizeof(g_probable_mtu) /
1357 sizeof(g_probable_mtu[0])) - 1]);
1358}
1359
1360static unsigned int
1361dtls1_guess_mtu(unsigned int curr_mtu)
1362{
1363 unsigned int i;
1364
1365 if (curr_mtu == 0)
1366 return g_probable_mtu[0];
1367
1368 for (i = 0; i < sizeof(g_probable_mtu) / sizeof(g_probable_mtu[0]); i++)
1369 if (curr_mtu > g_probable_mtu[i])
1370 return g_probable_mtu[i];
1371
1372 return curr_mtu;
1373}
1374
1375void
1376dtls1_get_message_header(unsigned char *data, struct hm_header_st *msg_hdr)
1377{
1378 memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
1379 msg_hdr->type = *(data++);
1380 n2l3(data, msg_hdr->msg_len);
1381
1382 n2s(data, msg_hdr->seq);
1383 n2l3(data, msg_hdr->frag_off);
1384 n2l3(data, msg_hdr->frag_len);
1385}
1386
1387void
1388dtls1_get_ccs_header(unsigned char *data, struct ccs_header_st *ccs_hdr)
1389{
1390 memset(ccs_hdr, 0x00, sizeof(struct ccs_header_st));
1391
1392 ccs_hdr->type = *(data++);
1393}
1394
1395int
1396dtls1_shutdown(SSL *s)
1397{
1398 int ret;
1399
1400 ret = ssl3_shutdown(s);
1401 return ret;
1402}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-08-15 00:53:08 +0000