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1/* ssl/d1_both.c */
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 <string.h>
118#include <stdio.h>
119#include "ssl_locl.h"
120#include <openssl/buffer.h>
121#include <openssl/rand.h>
122#include <openssl/objects.h>
123#include <openssl/evp.h>
124#include <openssl/x509.h>
125
126#define RSMBLY_BITMASK_SIZE(msg_len) (((msg_len) + 7) / 8)
127
128#define RSMBLY_BITMASK_MARK(bitmask, start, end) { \
129 if ((end) - (start) <= 8) { \
130 long ii; \
131 for (ii = (start); ii < (end); ii++) bitmask[((ii) >> 3)] |= (1 << ((ii) & 7)); \
132 } else { \
133 long ii; \
134 bitmask[((start) >> 3)] |= bitmask_start_values[((start) & 7)]; \
135 for (ii = (((start) >> 3) + 1); ii < ((((end) - 1)) >> 3); ii++) bitmask[ii] = 0xff; \
136 bitmask[(((end) - 1) >> 3)] |= bitmask_end_values[((end) & 7)]; \
137 } }
138
139#define RSMBLY_BITMASK_IS_COMPLETE(bitmask, msg_len, is_complete) { \
140 long ii; \
141 OPENSSL_assert((msg_len) > 0); \
142 is_complete = 1; \
143 if (bitmask[(((msg_len) - 1) >> 3)] != bitmask_end_values[((msg_len) & 7)]) is_complete = 0; \
144 if (is_complete) for (ii = (((msg_len) - 1) >> 3) - 1; ii >= 0 ; ii--) \
145 if (bitmask[ii] != 0xff) { is_complete = 0; break; } }
146
147#if 0
148#define RSMBLY_BITMASK_PRINT(bitmask, msg_len) { \
149 long ii; \
150 printf("bitmask: "); for (ii = 0; ii < (msg_len); ii++) \
151 printf("%d ", (bitmask[ii >> 3] & (1 << (ii & 7))) >> (ii & 7)); \
152 printf("\n"); }
153#endif
154
155static unsigned char bitmask_start_values[] = {0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80};
156static unsigned char bitmask_end_values[] = {0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f};
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_min_mtu(void);
162static unsigned int dtls1_guess_mtu(unsigned int curr_mtu);
163static void dtls1_fix_message_header(SSL *s, unsigned long frag_off,
164 unsigned long frag_len);
165static unsigned char *dtls1_write_message_header(SSL *s,
166 unsigned char *p);
167static void dtls1_set_message_header_int(SSL *s, unsigned char mt,
168 unsigned long len, unsigned short seq_num, unsigned long frag_off,
169 unsigned long frag_len);
170static long dtls1_get_message_fragment(SSL *s, int st1, int stn,
171 long max, int *ok);
172
173static hm_fragment *
174dtls1_hm_fragment_new(unsigned long frag_len, int reassembly)
175 {
176 hm_fragment *frag = NULL;
177 unsigned char *buf = NULL;
178 unsigned char *bitmask = NULL;
179
180 frag = (hm_fragment *)OPENSSL_malloc(sizeof(hm_fragment));
181 if ( frag == NULL)
182 return NULL;
183
184 if (frag_len)
185 {
186 buf = (unsigned char *)OPENSSL_malloc(frag_len);
187 if ( buf == NULL)
188 {
189 OPENSSL_free(frag);
190 return NULL;
191 }
192 }
193
194 /* zero length fragment gets zero frag->fragment */
195 frag->fragment = buf;
196
197 /* Initialize reassembly bitmask if necessary */
198 if (reassembly)
199 {
200 bitmask = (unsigned char *)OPENSSL_malloc(RSMBLY_BITMASK_SIZE(frag_len));
201 if (bitmask == NULL)
202 {
203 if (buf != NULL) OPENSSL_free(buf);
204 OPENSSL_free(frag);
205 return NULL;
206 }
207 memset(bitmask, 0, RSMBLY_BITMASK_SIZE(frag_len));
208 }
209
210 frag->reassembly = bitmask;
211
212 return frag;
213 }
214
215static void
216dtls1_hm_fragment_free(hm_fragment *frag)
217 {
218 if (frag->fragment) OPENSSL_free(frag->fragment);
219 if (frag->reassembly) OPENSSL_free(frag->reassembly);
220 OPENSSL_free(frag);
221 }
222
223/* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */
224int dtls1_do_write(SSL *s, int type)
225 {
226 int ret;
227 int curr_mtu;
228 unsigned int len, frag_off, mac_size, blocksize;
229
230 /* AHA! Figure out the MTU, and stick to the right size */
231 if ( ! (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU))
232 {
233 s->d1->mtu =
234 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
235
236 /* I've seen the kernel return bogus numbers when it doesn't know
237 * (initial write), so just make sure we have a reasonable number */
238 if ( s->d1->mtu < dtls1_min_mtu())
239 {
240 s->d1->mtu = 0;
241 s->d1->mtu = dtls1_guess_mtu(s->d1->mtu);
242 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SET_MTU,
243 s->d1->mtu, NULL);
244 }
245 }
246#if 0
247 mtu = s->d1->mtu;
248
249 fprintf(stderr, "using MTU = %d\n", mtu);
250
251 mtu -= (DTLS1_HM_HEADER_LENGTH + DTLS1_RT_HEADER_LENGTH);
252
253 curr_mtu = mtu - BIO_wpending(SSL_get_wbio(s));
254
255 if ( curr_mtu > 0)
256 mtu = curr_mtu;
257 else if ( ( ret = BIO_flush(SSL_get_wbio(s))) <= 0)
258 return ret;
259
260 if ( BIO_wpending(SSL_get_wbio(s)) + s->init_num >= mtu)
261 {
262 ret = BIO_flush(SSL_get_wbio(s));
263 if ( ret <= 0)
264 return ret;
265 mtu = s->d1->mtu - (DTLS1_HM_HEADER_LENGTH + DTLS1_RT_HEADER_LENGTH);
266 }
267
268 OPENSSL_assert(mtu > 0); /* should have something reasonable now */
269
270#endif
271
272 if ( s->init_off == 0 && type == SSL3_RT_HANDSHAKE)
273 OPENSSL_assert(s->init_num ==
274 (int)s->d1->w_msg_hdr.msg_len + DTLS1_HM_HEADER_LENGTH);
275
276 if (s->write_hash)
277 mac_size = EVP_MD_CTX_size(s->write_hash);
278 else
279 mac_size = 0;
280
281 if (s->enc_write_ctx &&
282 (EVP_CIPHER_mode( s->enc_write_ctx->cipher) & EVP_CIPH_CBC_MODE))
283 blocksize = 2 * EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
284 else
285 blocksize = 0;
286
287 frag_off = 0;
288 while( s->init_num)
289 {
290 curr_mtu = s->d1->mtu - BIO_wpending(SSL_get_wbio(s)) -
291 DTLS1_RT_HEADER_LENGTH - mac_size - blocksize;
292
293 if ( curr_mtu <= DTLS1_HM_HEADER_LENGTH)
294 {
295 /* grr.. we could get an error if MTU picked was wrong */
296 ret = BIO_flush(SSL_get_wbio(s));
297 if ( ret <= 0)
298 return ret;
299 curr_mtu = s->d1->mtu - DTLS1_RT_HEADER_LENGTH -
300 mac_size - blocksize;
301 }
302
303 if ( s->init_num > curr_mtu)
304 len = curr_mtu;
305 else
306 len = s->init_num;
307
308
309 /* XDTLS: this function is too long. split out the CCS part */
310 if ( type == SSL3_RT_HANDSHAKE)
311 {
312 if ( s->init_off != 0)
313 {
314 OPENSSL_assert(s->init_off > DTLS1_HM_HEADER_LENGTH);
315 s->init_off -= DTLS1_HM_HEADER_LENGTH;
316 s->init_num += DTLS1_HM_HEADER_LENGTH;
317
318 /* write atleast DTLS1_HM_HEADER_LENGTH bytes */
319 if ( len <= DTLS1_HM_HEADER_LENGTH)
320 len += DTLS1_HM_HEADER_LENGTH;
321 }
322
323 dtls1_fix_message_header(s, frag_off,
324 len - DTLS1_HM_HEADER_LENGTH);
325
326 dtls1_write_message_header(s, (unsigned char *)&s->init_buf->data[s->init_off]);
327
328 OPENSSL_assert(len >= DTLS1_HM_HEADER_LENGTH);
329 }
330
331 ret=dtls1_write_bytes(s,type,&s->init_buf->data[s->init_off],
332 len);
333 if (ret < 0)
334 {
335 /* might need to update MTU here, but we don't know
336 * which previous packet caused the failure -- so can't
337 * really retransmit anything. continue as if everything
338 * is fine and wait for an alert to handle the
339 * retransmit
340 */
341 if ( BIO_ctrl(SSL_get_wbio(s),
342 BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL) > 0 )
343 s->d1->mtu = BIO_ctrl(SSL_get_wbio(s),
344 BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
345 else
346 return(-1);
347 }
348 else
349 {
350
351 /* bad if this assert fails, only part of the handshake
352 * message got sent. but why would this happen? */
353 OPENSSL_assert(len == (unsigned int)ret);
354
355 if (type == SSL3_RT_HANDSHAKE && ! s->d1->retransmitting)
356 {
357 /* should not be done for 'Hello Request's, but in that case
358 * we'll ignore the result anyway */
359 unsigned char *p = (unsigned char *)&s->init_buf->data[s->init_off];
360 const struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
361 int xlen;
362
363 if (frag_off == 0 && s->version != DTLS1_BAD_VER)
364 {
365 /* reconstruct message header is if it
366 * is being sent in single fragment */
367 *p++ = msg_hdr->type;
368 l2n3(msg_hdr->msg_len,p);
369 s2n (msg_hdr->seq,p);
370 l2n3(0,p);
371 l2n3(msg_hdr->msg_len,p);
372 p -= DTLS1_HM_HEADER_LENGTH;
373 xlen = ret;
374 }
375 else
376 {
377 p += DTLS1_HM_HEADER_LENGTH;
378 xlen = ret - DTLS1_HM_HEADER_LENGTH;
379 }
380
381 ssl3_finish_mac(s, p, xlen);
382 }
383
384 if (ret == s->init_num)
385 {
386 if (s->msg_callback)
387 s->msg_callback(1, s->version, type, s->init_buf->data,
388 (size_t)(s->init_off + s->init_num), s,
389 s->msg_callback_arg);
390
391 s->init_off = 0; /* done writing this message */
392 s->init_num = 0;
393
394 return(1);
395 }
396 s->init_off+=ret;
397 s->init_num-=ret;
398 frag_off += (ret -= DTLS1_HM_HEADER_LENGTH);
399 }
400 }
401 return(0);
402 }
403
404
405/* Obtain handshake message of message type 'mt' (any if mt == -1),
406 * maximum acceptable body length 'max'.
407 * Read an entire handshake message. Handshake messages arrive in
408 * fragments.
409 */
410long dtls1_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
411 {
412 int i, al;
413 struct hm_header_st *msg_hdr;
414 unsigned char *p;
415 unsigned long msg_len;
416
417 /* s3->tmp is used to store messages that are unexpected, caused
418 * by the absence of an optional handshake message */
419 if (s->s3->tmp.reuse_message)
420 {
421 s->s3->tmp.reuse_message=0;
422 if ((mt >= 0) && (s->s3->tmp.message_type != mt))
423 {
424 al=SSL_AD_UNEXPECTED_MESSAGE;
425 SSLerr(SSL_F_DTLS1_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
426 goto f_err;
427 }
428 *ok=1;
429 s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
430 s->init_num = (int)s->s3->tmp.message_size;
431 return s->init_num;
432 }
433
434 msg_hdr = &s->d1->r_msg_hdr;
435 memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
436
437again:
438 i = dtls1_get_message_fragment(s, st1, stn, max, ok);
439 if ( i == DTLS1_HM_BAD_FRAGMENT ||
440 i == DTLS1_HM_FRAGMENT_RETRY) /* bad fragment received */
441 goto again;
442 else if ( i <= 0 && !*ok)
443 return i;
444
445 p = (unsigned char *)s->init_buf->data;
446 msg_len = msg_hdr->msg_len;
447
448 /* reconstruct message header */
449 *(p++) = msg_hdr->type;
450 l2n3(msg_len,p);
451 s2n (msg_hdr->seq,p);
452 l2n3(0,p);
453 l2n3(msg_len,p);
454 if (s->version != DTLS1_BAD_VER) {
455 p -= DTLS1_HM_HEADER_LENGTH;
456 msg_len += DTLS1_HM_HEADER_LENGTH;
457 }
458
459 ssl3_finish_mac(s, p, msg_len);
460 if (s->msg_callback)
461 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
462 p, msg_len,
463 s, s->msg_callback_arg);
464
465 memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
466
467 s->d1->handshake_read_seq++;
468 /* we just read a handshake message from the other side:
469 * this means that we don't need to retransmit of the
470 * buffered messages.
471 * XDTLS: may be able clear out this
472 * buffer a little sooner (i.e if an out-of-order
473 * handshake message/record is received at the record
474 * layer.
475 * XDTLS: exception is that the server needs to
476 * know that change cipher spec and finished messages
477 * have been received by the client before clearing this
478 * buffer. this can simply be done by waiting for the
479 * first data segment, but is there a better way? */
480 dtls1_clear_record_buffer(s);
481
482 s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
483 return s->init_num;
484
485f_err:
486 ssl3_send_alert(s,SSL3_AL_FATAL,al);
487 *ok = 0;
488 return -1;
489 }
490
491
492static int dtls1_preprocess_fragment(SSL *s,struct hm_header_st *msg_hdr,int max)
493 {
494 size_t frag_off,frag_len,msg_len;
495
496 msg_len = msg_hdr->msg_len;
497 frag_off = msg_hdr->frag_off;
498 frag_len = msg_hdr->frag_len;
499
500 /* sanity checking */
501 if ( (frag_off+frag_len) > msg_len)
502 {
503 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE);
504 return SSL_AD_ILLEGAL_PARAMETER;
505 }
506
507 if ( (frag_off+frag_len) > (unsigned long)max)
508 {
509 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE);
510 return SSL_AD_ILLEGAL_PARAMETER;
511 }
512
513 if ( s->d1->r_msg_hdr.frag_off == 0) /* first fragment */
514 {
515 /* msg_len is limited to 2^24, but is effectively checked
516 * against max above */
517 if (!BUF_MEM_grow_clean(s->init_buf,msg_len+DTLS1_HM_HEADER_LENGTH))
518 {
519 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,ERR_R_BUF_LIB);
520 return SSL_AD_INTERNAL_ERROR;
521 }
522
523 s->s3->tmp.message_size = msg_len;
524 s->d1->r_msg_hdr.msg_len = msg_len;
525 s->s3->tmp.message_type = msg_hdr->type;
526 s->d1->r_msg_hdr.type = msg_hdr->type;
527 s->d1->r_msg_hdr.seq = msg_hdr->seq;
528 }
529 else if (msg_len != s->d1->r_msg_hdr.msg_len)
530 {
531 /* They must be playing with us! BTW, failure to enforce
532 * upper limit would open possibility for buffer overrun. */
533 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE);
534 return SSL_AD_ILLEGAL_PARAMETER;
535 }
536
537 return 0; /* no error */
538 }
539
540
541static int
542dtls1_retrieve_buffered_fragment(SSL *s, long max, int *ok)
543 {
544 /* (0) check whether the desired fragment is available
545 * if so:
546 * (1) copy over the fragment to s->init_buf->data[]
547 * (2) update s->init_num
548 */
549 pitem *item;
550 hm_fragment *frag;
551 int al;
552
553 *ok = 0;
554 item = pqueue_peek(s->d1->buffered_messages);
555 if ( item == NULL)
556 return 0;
557
558 frag = (hm_fragment *)item->data;
559
560 /* Don't return if reassembly still in progress */
561 if (frag->reassembly != NULL)
562 return 0;
563
564 if ( s->d1->handshake_read_seq == frag->msg_header.seq)
565 {
566 unsigned long frag_len = frag->msg_header.frag_len;
567 pqueue_pop(s->d1->buffered_messages);
568
569 al=dtls1_preprocess_fragment(s,&frag->msg_header,max);
570
571 if (al==0) /* no alert */
572 {
573 unsigned char *p = (unsigned char *)s->init_buf->data+DTLS1_HM_HEADER_LENGTH;
574 memcpy(&p[frag->msg_header.frag_off],
575 frag->fragment,frag->msg_header.frag_len);
576 }
577
578 dtls1_hm_fragment_free(frag);
579 pitem_free(item);
580
581 if (al==0)
582 {
583 *ok = 1;
584 return frag_len;
585 }
586
587 ssl3_send_alert(s,SSL3_AL_FATAL,al);
588 s->init_num = 0;
589 *ok = 0;
590 return -1;
591 }
592 else
593 return 0;
594 }
595
596
597static int
598dtls1_reassemble_fragment(SSL *s, struct hm_header_st* msg_hdr, int *ok)
599 {
600 hm_fragment *frag = NULL;
601 pitem *item = NULL;
602 int i = -1, is_complete;
603 unsigned char seq64be[8];
604 unsigned long frag_len = msg_hdr->frag_len, max_len;
605
606 if ((msg_hdr->frag_off+frag_len) > msg_hdr->msg_len)
607 goto err;
608
609 /* Determine maximum allowed message size. Depends on (user set)
610 * maximum certificate length, but 16k is minimum.
611 */
612 if (DTLS1_HM_HEADER_LENGTH + SSL3_RT_MAX_ENCRYPTED_LENGTH < s->max_cert_list)
613 max_len = s->max_cert_list;
614 else
615 max_len = DTLS1_HM_HEADER_LENGTH + SSL3_RT_MAX_ENCRYPTED_LENGTH;
616
617 if ((msg_hdr->frag_off+frag_len) > max_len)
618 goto err;
619
620 /* Try to find item in queue */
621 memset(seq64be,0,sizeof(seq64be));
622 seq64be[6] = (unsigned char) (msg_hdr->seq>>8);
623 seq64be[7] = (unsigned char) msg_hdr->seq;
624 item = pqueue_find(s->d1->buffered_messages, seq64be);
625
626 if (item == NULL)
627 {
628 frag = dtls1_hm_fragment_new(msg_hdr->msg_len, 1);
629 if ( frag == NULL)
630 goto err;
631 memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr));
632 frag->msg_header.frag_len = frag->msg_header.msg_len;
633 frag->msg_header.frag_off = 0;
634 }
635 else
636 frag = (hm_fragment*) item->data;
637
638 /* If message is already reassembled, this must be a
639 * retransmit and can be dropped.
640 */
641 if (frag->reassembly == NULL)
642 {
643 unsigned char devnull [256];
644
645 while (frag_len)
646 {
647 i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
648 devnull,
649 frag_len>sizeof(devnull)?sizeof(devnull):frag_len,0);
650 if (i<=0) goto err;
651 frag_len -= i;
652 }
653 return DTLS1_HM_FRAGMENT_RETRY;
654 }
655
656 /* read the body of the fragment (header has already been read */
657 i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
658 frag->fragment + msg_hdr->frag_off,frag_len,0);
659 if (i<=0 || (unsigned long)i!=frag_len)
660 goto err;
661
662 RSMBLY_BITMASK_MARK(frag->reassembly, (long)msg_hdr->frag_off,
663 (long)(msg_hdr->frag_off + frag_len));
664
665 RSMBLY_BITMASK_IS_COMPLETE(frag->reassembly, (long)msg_hdr->msg_len,
666 is_complete);
667
668 if (is_complete)
669 {
670 OPENSSL_free(frag->reassembly);
671 frag->reassembly = NULL;
672 }
673
674 if (item == NULL)
675 {
676 memset(seq64be,0,sizeof(seq64be));
677 seq64be[6] = (unsigned char)(msg_hdr->seq>>8);
678 seq64be[7] = (unsigned char)(msg_hdr->seq);
679
680 item = pitem_new(seq64be, frag);
681 if (item == NULL)
682 {
683 goto err;
684 i = -1;
685 }
686
687 pqueue_insert(s->d1->buffered_messages, item);
688 }
689
690 return DTLS1_HM_FRAGMENT_RETRY;
691
692err:
693 if (frag != NULL) dtls1_hm_fragment_free(frag);
694 if (item != NULL) OPENSSL_free(item);
695 *ok = 0;
696 return i;
697 }
698
699
700static int
701dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok)
702{
703 int i=-1;
704 hm_fragment *frag = NULL;
705 pitem *item = NULL;
706 unsigned char seq64be[8];
707 unsigned long frag_len = msg_hdr->frag_len;
708
709 if ((msg_hdr->frag_off+frag_len) > msg_hdr->msg_len)
710 goto err;
711
712 /* Try to find item in queue, to prevent duplicate entries */
713 memset(seq64be,0,sizeof(seq64be));
714 seq64be[6] = (unsigned char) (msg_hdr->seq>>8);
715 seq64be[7] = (unsigned char) msg_hdr->seq;
716 item = pqueue_find(s->d1->buffered_messages, seq64be);
717
718 /* If we already have an entry and this one is a fragment,
719 * don't discard it and rather try to reassemble it.
720 */
721 if (item != NULL && frag_len < msg_hdr->msg_len)
722 item = NULL;
723
724 /* Discard the message if sequence number was already there, is
725 * too far in the future, already in the queue or if we received
726 * a FINISHED before the SERVER_HELLO, which then must be a stale
727 * retransmit.
728 */
729 if (msg_hdr->seq <= s->d1->handshake_read_seq ||
730 msg_hdr->seq > s->d1->handshake_read_seq + 10 || item != NULL ||
731 (s->d1->handshake_read_seq == 0 && msg_hdr->type == SSL3_MT_FINISHED))
732 {
733 unsigned char devnull [256];
734
735 while (frag_len)
736 {
737 i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
738 devnull,
739 frag_len>sizeof(devnull)?sizeof(devnull):frag_len,0);
740 if (i<=0) goto err;
741 frag_len -= i;
742 }
743 }
744 else
745 {
746 if (frag_len && frag_len < msg_hdr->msg_len)
747 return dtls1_reassemble_fragment(s, msg_hdr, ok);
748
749 frag = dtls1_hm_fragment_new(frag_len, 0);
750 if ( frag == NULL)
751 goto err;
752
753 memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr));
754
755 if (frag_len)
756 {
757 /* read the body of the fragment (header has already been read */
758 i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
759 frag->fragment,frag_len,0);
760 if (i<=0 || (unsigned long)i!=frag_len)
761 goto err;
762 }
763
764 memset(seq64be,0,sizeof(seq64be));
765 seq64be[6] = (unsigned char)(msg_hdr->seq>>8);
766 seq64be[7] = (unsigned char)(msg_hdr->seq);
767
768 item = pitem_new(seq64be, frag);
769 if ( item == NULL)
770 goto err;
771
772 pqueue_insert(s->d1->buffered_messages, item);
773 }
774
775 return DTLS1_HM_FRAGMENT_RETRY;
776
777err:
778 if ( frag != NULL) dtls1_hm_fragment_free(frag);
779 if ( item != NULL) OPENSSL_free(item);
780 *ok = 0;
781 return i;
782 }
783
784
785static long
786dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok)
787 {
788 unsigned char wire[DTLS1_HM_HEADER_LENGTH];
789 unsigned long len, frag_off, frag_len;
790 int i,al;
791 struct hm_header_st msg_hdr;
792
793 /* see if we have the required fragment already */
794 if ((frag_len = dtls1_retrieve_buffered_fragment(s,max,ok)) || *ok)
795 {
796 if (*ok) s->init_num = frag_len;
797 return frag_len;
798 }
799
800 /* read handshake message header */
801 i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,wire,
802 DTLS1_HM_HEADER_LENGTH, 0);
803 if (i <= 0) /* nbio, or an error */
804 {
805 s->rwstate=SSL_READING;
806 *ok = 0;
807 return i;
808 }
809 OPENSSL_assert(i == DTLS1_HM_HEADER_LENGTH);
810
811 /* parse the message fragment header */
812 dtls1_get_message_header(wire, &msg_hdr);
813
814 /*
815 * if this is a future (or stale) message it gets buffered
816 * (or dropped)--no further processing at this time
817 */
818 if ( msg_hdr.seq != s->d1->handshake_read_seq)
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 if (wire[1] == 0 && wire[2] == 0 && wire[3] == 0)
836 {
837 if (s->msg_callback)
838 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
839 wire, DTLS1_HM_HEADER_LENGTH, s,
840 s->msg_callback_arg);
841
842 s->init_num = 0;
843 return dtls1_get_message_fragment(s, st1, stn,
844 max, ok);
845 }
846 else /* Incorrectly formated Hello request */
847 {
848 al=SSL_AD_UNEXPECTED_MESSAGE;
849 SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL_R_UNEXPECTED_MESSAGE);
850 goto f_err;
851 }
852 }
853
854 if ((al=dtls1_preprocess_fragment(s,&msg_hdr,max)))
855 goto f_err;
856
857 /* XDTLS: ressurect this when restart is in place */
858 s->state=stn;
859
860 if ( frag_len > 0)
861 {
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 {
869 s->rwstate=SSL_READING;
870 *ok = 0;
871 return i;
872 }
873 }
874 else
875 i = 0;
876
877 /* XDTLS: an incorrectly formatted fragment should cause the
878 * handshake to fail */
879 OPENSSL_assert(i == (int)frag_len);
880
881 *ok = 1;
882
883 /* Note that s->init_num is *not* used as current offset in
884 * s->init_buf->data, but as a counter summing up fragments'
885 * lengths: as soon as they sum up to handshake packet
886 * length, we assume we have got all the fragments. */
887 s->init_num = frag_len;
888 return frag_len;
889
890f_err:
891 ssl3_send_alert(s,SSL3_AL_FATAL,al);
892 s->init_num = 0;
893
894 *ok=0;
895 return(-1);
896 }
897
898int dtls1_send_finished(SSL *s, int a, int b, const char *sender, int slen)
899 {
900 unsigned char *p,*d;
901 int i;
902 unsigned long l;
903
904 if (s->state == a)
905 {
906 d=(unsigned char *)s->init_buf->data;
907 p= &(d[DTLS1_HM_HEADER_LENGTH]);
908
909 i=s->method->ssl3_enc->final_finish_mac(s,
910 sender,slen,s->s3->tmp.finish_md);
911 s->s3->tmp.finish_md_len = i;
912 memcpy(p, s->s3->tmp.finish_md, i);
913 p+=i;
914 l=i;
915
916 /* Copy the finished so we can use it for
917 * renegotiation checks
918 */
919 if(s->type == SSL_ST_CONNECT)
920 {
921 OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
922 memcpy(s->s3->previous_client_finished,
923 s->s3->tmp.finish_md, i);
924 s->s3->previous_client_finished_len=i;
925 }
926 else
927 {
928 OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
929 memcpy(s->s3->previous_server_finished,
930 s->s3->tmp.finish_md, i);
931 s->s3->previous_server_finished_len=i;
932 }
933
934#ifdef OPENSSL_SYS_WIN16
935 /* MSVC 1.5 does not clear the top bytes of the word unless
936 * I do this.
937 */
938 l&=0xffff;
939#endif
940
941 d = dtls1_set_message_header(s, d, SSL3_MT_FINISHED, l, 0, l);
942 s->init_num=(int)l+DTLS1_HM_HEADER_LENGTH;
943 s->init_off=0;
944
945 /* buffer the message to handle re-xmits */
946 dtls1_buffer_message(s, 0);
947
948 s->state=b;
949 }
950
951 /* SSL3_ST_SEND_xxxxxx_HELLO_B */
952 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
953 }
954
955/* for these 2 messages, we need to
956 * ssl->enc_read_ctx re-init
957 * ssl->s3->read_sequence zero
958 * ssl->s3->read_mac_secret re-init
959 * ssl->session->read_sym_enc assign
960 * ssl->session->read_compression assign
961 * ssl->session->read_hash assign
962 */
963int dtls1_send_change_cipher_spec(SSL *s, int a, int b)
964 {
965 unsigned char *p;
966
967 if (s->state == a)
968 {
969 p=(unsigned char *)s->init_buf->data;
970 *p++=SSL3_MT_CCS;
971 s->d1->handshake_write_seq = s->d1->next_handshake_write_seq;
972 s->init_num=DTLS1_CCS_HEADER_LENGTH;
973
974 if (s->version == DTLS1_BAD_VER) {
975 s->d1->next_handshake_write_seq++;
976 s2n(s->d1->handshake_write_seq,p);
977 s->init_num+=2;
978 }
979
980 s->init_off=0;
981
982 dtls1_set_message_header_int(s, SSL3_MT_CCS, 0,
983 s->d1->handshake_write_seq, 0, 0);
984
985 /* buffer the message to handle re-xmits */
986 dtls1_buffer_message(s, 1);
987
988 s->state=b;
989 }
990
991 /* SSL3_ST_CW_CHANGE_B */
992 return(dtls1_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
993 }
994
995static int dtls1_add_cert_to_buf(BUF_MEM *buf, unsigned long *l, X509 *x)
996 {
997 int n;
998 unsigned char *p;
999
1000 n=i2d_X509(x,NULL);
1001 if (!BUF_MEM_grow_clean(buf,(int)(n+(*l)+3)))
1002 {
1003 SSLerr(SSL_F_DTLS1_ADD_CERT_TO_BUF,ERR_R_BUF_LIB);
1004 return 0;
1005 }
1006 p=(unsigned char *)&(buf->data[*l]);
1007 l2n3(n,p);
1008 i2d_X509(x,&p);
1009 *l+=n+3;
1010
1011 return 1;
1012 }
1013unsigned long dtls1_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 {
1024 SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
1025 return(0);
1026 }
1027 if (x != NULL)
1028 {
1029 X509_STORE_CTX xs_ctx;
1030
1031 if (!X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,x,NULL))
1032 {
1033 SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_X509_LIB);
1034 return(0);
1035 }
1036
1037 X509_verify_cert(&xs_ctx);
1038 /* Don't leave errors in the queue */
1039 ERR_clear_error();
1040 for (i=0; i < sk_X509_num(xs_ctx.chain); i++)
1041 {
1042 x = sk_X509_value(xs_ctx.chain, i);
1043
1044 if (!dtls1_add_cert_to_buf(buf, &l, x))
1045 {
1046 X509_STORE_CTX_cleanup(&xs_ctx);
1047 return 0;
1048 }
1049 }
1050 X509_STORE_CTX_cleanup(&xs_ctx);
1051 }
1052 /* Thawte special :-) */
1053 for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++)
1054 {
1055 x=sk_X509_value(s->ctx->extra_certs,i);
1056 if (!dtls1_add_cert_to_buf(buf, &l, x))
1057 return 0;
1058 }
1059
1060 l-= (3 + DTLS1_HM_HEADER_LENGTH);
1061
1062 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1063 l2n3(l,p);
1064 l+=3;
1065 p=(unsigned char *)&(buf->data[0]);
1066 p = dtls1_set_message_header(s, p, SSL3_MT_CERTIFICATE, l, 0, l);
1067
1068 l+=DTLS1_HM_HEADER_LENGTH;
1069 return(l);
1070 }
1071
1072int dtls1_read_failed(SSL *s, int code)
1073 {
1074 if ( code > 0)
1075 {
1076 fprintf( stderr, "invalid state reached %s:%d", __FILE__, __LINE__);
1077 return 1;
1078 }
1079
1080 if (!dtls1_is_timer_expired(s))
1081 {
1082 /* not a timeout, none of our business,
1083 let higher layers handle this. in fact it's probably an error */
1084 return code;
1085 }
1086
1087 if ( ! SSL_in_init(s)) /* done, no need to send a retransmit */
1088 {
1089 BIO_set_flags(SSL_get_rbio(s), BIO_FLAGS_READ);
1090 return code;
1091 }
1092
1093#if 0 /* for now, each alert contains only one record number */
1094 item = pqueue_peek(state->rcvd_records);
1095 if ( item )
1096 {
1097 /* send an alert immediately for all the missing records */
1098 }
1099 else
1100#endif
1101
1102#if 0 /* no more alert sending, just retransmit the last set of messages */
1103 if ( state->timeout.read_timeouts >= DTLS1_TMO_READ_COUNT)
1104 ssl3_send_alert(s,SSL3_AL_WARNING,
1105 DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
1106#endif
1107
1108 return dtls1_handle_timeout(s);
1109 }
1110
1111int
1112dtls1_get_queue_priority(unsigned short seq, int is_ccs)
1113 {
1114 /* The index of the retransmission queue actually is the message sequence number,
1115 * since the queue only contains messages of a single handshake. However, the
1116 * ChangeCipherSpec has no message sequence number and so using only the sequence
1117 * will result in the CCS and Finished having the same index. To prevent this,
1118 * the sequence number is multiplied by 2. In case of a CCS 1 is subtracted.
1119 * This does not only differ CSS and Finished, it also maintains the order of the
1120 * index (important for priority queues) and fits in the unsigned short variable.
1121 */
1122 return seq * 2 - is_ccs;
1123 }
1124
1125int
1126dtls1_retransmit_buffered_messages(SSL *s)
1127 {
1128 pqueue sent = s->d1->sent_messages;
1129 piterator iter;
1130 pitem *item;
1131 hm_fragment *frag;
1132 int found = 0;
1133
1134 iter = pqueue_iterator(sent);
1135
1136 for ( item = pqueue_next(&iter); item != NULL; item = pqueue_next(&iter))
1137 {
1138 frag = (hm_fragment *)item->data;
1139 if ( dtls1_retransmit_message(s,
1140 (unsigned short)dtls1_get_queue_priority(frag->msg_header.seq, frag->msg_header.is_ccs),
1141 0, &found) <= 0 && found)
1142 {
1143 fprintf(stderr, "dtls1_retransmit_message() failed\n");
1144 return -1;
1145 }
1146 }
1147
1148 return 1;
1149 }
1150
1151int
1152dtls1_buffer_message(SSL *s, int is_ccs)
1153 {
1154 pitem *item;
1155 hm_fragment *frag;
1156 unsigned char seq64be[8];
1157
1158 /* this function is called immediately after a message has
1159 * been serialized */
1160 OPENSSL_assert(s->init_off == 0);
1161
1162 frag = dtls1_hm_fragment_new(s->init_num, 0);
1163
1164 memcpy(frag->fragment, s->init_buf->data, s->init_num);
1165
1166 if ( is_ccs)
1167 {
1168 OPENSSL_assert(s->d1->w_msg_hdr.msg_len +
1169 ((s->version==DTLS1_VERSION)?DTLS1_CCS_HEADER_LENGTH:3) == (unsigned int)s->init_num);
1170 }
1171 else
1172 {
1173 OPENSSL_assert(s->d1->w_msg_hdr.msg_len +
1174 DTLS1_HM_HEADER_LENGTH == (unsigned int)s->init_num);
1175 }
1176
1177 frag->msg_header.msg_len = s->d1->w_msg_hdr.msg_len;
1178 frag->msg_header.seq = s->d1->w_msg_hdr.seq;
1179 frag->msg_header.type = s->d1->w_msg_hdr.type;
1180 frag->msg_header.frag_off = 0;
1181 frag->msg_header.frag_len = s->d1->w_msg_hdr.msg_len;
1182 frag->msg_header.is_ccs = is_ccs;
1183
1184 /* save current state*/
1185 frag->msg_header.saved_retransmit_state.enc_write_ctx = s->enc_write_ctx;
1186 frag->msg_header.saved_retransmit_state.write_hash = s->write_hash;
1187 frag->msg_header.saved_retransmit_state.compress = s->compress;
1188 frag->msg_header.saved_retransmit_state.session = s->session;
1189 frag->msg_header.saved_retransmit_state.epoch = s->d1->w_epoch;
1190
1191 memset(seq64be,0,sizeof(seq64be));
1192 seq64be[6] = (unsigned char)(dtls1_get_queue_priority(frag->msg_header.seq,
1193 frag->msg_header.is_ccs)>>8);
1194 seq64be[7] = (unsigned char)(dtls1_get_queue_priority(frag->msg_header.seq,
1195 frag->msg_header.is_ccs));
1196
1197 item = pitem_new(seq64be, frag);
1198 if ( item == NULL)
1199 {
1200 dtls1_hm_fragment_free(frag);
1201 return 0;
1202 }
1203
1204#if 0
1205 fprintf( stderr, "buffered messge: \ttype = %xx\n", msg_buf->type);
1206 fprintf( stderr, "\t\t\t\t\tlen = %d\n", msg_buf->len);
1207 fprintf( stderr, "\t\t\t\t\tseq_num = %d\n", msg_buf->seq_num);
1208#endif
1209
1210 pqueue_insert(s->d1->sent_messages, item);
1211 return 1;
1212 }
1213
1214int
1215dtls1_retransmit_message(SSL *s, unsigned short seq, unsigned long frag_off,
1216 int *found)
1217 {
1218 int ret;
1219 /* XDTLS: for now assuming that read/writes are blocking */
1220 pitem *item;
1221 hm_fragment *frag ;
1222 unsigned long header_length;
1223 unsigned char seq64be[8];
1224 struct dtls1_retransmit_state saved_state;
1225 unsigned char save_write_sequence[8];
1226
1227 /*
1228 OPENSSL_assert(s->init_num == 0);
1229 OPENSSL_assert(s->init_off == 0);
1230 */
1231
1232 /* XDTLS: the requested message ought to be found, otherwise error */
1233 memset(seq64be,0,sizeof(seq64be));
1234 seq64be[6] = (unsigned char)(seq>>8);
1235 seq64be[7] = (unsigned char)seq;
1236
1237 item = pqueue_find(s->d1->sent_messages, seq64be);
1238 if ( item == NULL)
1239 {
1240 fprintf(stderr, "retransmit: message %d non-existant\n", seq);
1241 *found = 0;
1242 return 0;
1243 }
1244
1245 *found = 1;
1246 frag = (hm_fragment *)item->data;
1247
1248 if ( frag->msg_header.is_ccs)
1249 header_length = DTLS1_CCS_HEADER_LENGTH;
1250 else
1251 header_length = DTLS1_HM_HEADER_LENGTH;
1252
1253 memcpy(s->init_buf->data, frag->fragment,
1254 frag->msg_header.msg_len + header_length);
1255 s->init_num = frag->msg_header.msg_len + header_length;
1256
1257 dtls1_set_message_header_int(s, frag->msg_header.type,
1258 frag->msg_header.msg_len, frag->msg_header.seq, 0,
1259 frag->msg_header.frag_len);
1260
1261 /* save current state */
1262 saved_state.enc_write_ctx = s->enc_write_ctx;
1263 saved_state.write_hash = s->write_hash;
1264 saved_state.compress = s->compress;
1265 saved_state.session = s->session;
1266 saved_state.epoch = s->d1->w_epoch;
1267 saved_state.epoch = s->d1->w_epoch;
1268
1269 s->d1->retransmitting = 1;
1270
1271 /* restore state in which the message was originally sent */
1272 s->enc_write_ctx = frag->msg_header.saved_retransmit_state.enc_write_ctx;
1273 s->write_hash = frag->msg_header.saved_retransmit_state.write_hash;
1274 s->compress = frag->msg_header.saved_retransmit_state.compress;
1275 s->session = frag->msg_header.saved_retransmit_state.session;
1276 s->d1->w_epoch = frag->msg_header.saved_retransmit_state.epoch;
1277
1278 if (frag->msg_header.saved_retransmit_state.epoch == saved_state.epoch - 1)
1279 {
1280 memcpy(save_write_sequence, s->s3->write_sequence, sizeof(s->s3->write_sequence));
1281 memcpy(s->s3->write_sequence, s->d1->last_write_sequence, sizeof(s->s3->write_sequence));
1282 }
1283
1284 ret = dtls1_do_write(s, frag->msg_header.is_ccs ?
1285 SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE);
1286
1287 /* restore current state */
1288 s->enc_write_ctx = saved_state.enc_write_ctx;
1289 s->write_hash = saved_state.write_hash;
1290 s->compress = saved_state.compress;
1291 s->session = saved_state.session;
1292 s->d1->w_epoch = saved_state.epoch;
1293
1294 if (frag->msg_header.saved_retransmit_state.epoch == saved_state.epoch - 1)
1295 {
1296 memcpy(s->d1->last_write_sequence, s->s3->write_sequence, sizeof(s->s3->write_sequence));
1297 memcpy(s->s3->write_sequence, save_write_sequence, sizeof(s->s3->write_sequence));
1298 }
1299
1300 s->d1->retransmitting = 0;
1301
1302 (void)BIO_flush(SSL_get_wbio(s));
1303 return ret;
1304 }
1305
1306/* call this function when the buffered messages are no longer needed */
1307void
1308dtls1_clear_record_buffer(SSL *s)
1309 {
1310 pitem *item;
1311
1312 for(item = pqueue_pop(s->d1->sent_messages);
1313 item != NULL; item = pqueue_pop(s->d1->sent_messages))
1314 {
1315 dtls1_hm_fragment_free((hm_fragment *)item->data);
1316 pitem_free(item);
1317 }
1318 }
1319
1320
1321unsigned char *
1322dtls1_set_message_header(SSL *s, unsigned char *p, unsigned char mt,
1323 unsigned long len, unsigned long frag_off, unsigned long frag_len)
1324 {
1325 if ( frag_off == 0)
1326 {
1327 s->d1->handshake_write_seq = s->d1->next_handshake_write_seq;
1328 s->d1->next_handshake_write_seq++;
1329 }
1330
1331 dtls1_set_message_header_int(s, mt, len, s->d1->handshake_write_seq,
1332 frag_off, frag_len);
1333
1334 return p += DTLS1_HM_HEADER_LENGTH;
1335 }
1336
1337
1338/* don't actually do the writing, wait till the MTU has been retrieved */
1339static void
1340dtls1_set_message_header_int(SSL *s, unsigned char mt,
1341 unsigned long len, unsigned short seq_num, unsigned long frag_off,
1342 unsigned long frag_len)
1343 {
1344 struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
1345
1346 msg_hdr->type = mt;
1347 msg_hdr->msg_len = len;
1348 msg_hdr->seq = seq_num;
1349 msg_hdr->frag_off = frag_off;
1350 msg_hdr->frag_len = frag_len;
1351 }
1352
1353static void
1354dtls1_fix_message_header(SSL *s, unsigned long frag_off,
1355 unsigned long frag_len)
1356 {
1357 struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
1358
1359 msg_hdr->frag_off = frag_off;
1360 msg_hdr->frag_len = frag_len;
1361 }
1362
1363static unsigned char *
1364dtls1_write_message_header(SSL *s, unsigned char *p)
1365 {
1366 struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
1367
1368 *p++ = msg_hdr->type;
1369 l2n3(msg_hdr->msg_len, p);
1370
1371 s2n(msg_hdr->seq, p);
1372 l2n3(msg_hdr->frag_off, p);
1373 l2n3(msg_hdr->frag_len, p);
1374
1375 return p;
1376 }
1377
1378static unsigned int
1379dtls1_min_mtu(void)
1380 {
1381 return (g_probable_mtu[(sizeof(g_probable_mtu) /
1382 sizeof(g_probable_mtu[0])) - 1]);
1383 }
1384
1385static unsigned int
1386dtls1_guess_mtu(unsigned int curr_mtu)
1387 {
1388 unsigned int i;
1389
1390 if ( curr_mtu == 0 )
1391 return g_probable_mtu[0] ;
1392
1393 for ( i = 0; i < sizeof(g_probable_mtu)/sizeof(g_probable_mtu[0]); i++)
1394 if ( curr_mtu > g_probable_mtu[i])
1395 return g_probable_mtu[i];
1396
1397 return curr_mtu;
1398 }
1399
1400void
1401dtls1_get_message_header(unsigned char *data, struct hm_header_st *msg_hdr)
1402 {
1403 memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
1404 msg_hdr->type = *(data++);
1405 n2l3(data, msg_hdr->msg_len);
1406
1407 n2s(data, msg_hdr->seq);
1408 n2l3(data, msg_hdr->frag_off);
1409 n2l3(data, msg_hdr->frag_len);
1410 }
1411
1412void
1413dtls1_get_ccs_header(unsigned char *data, struct ccs_header_st *ccs_hdr)
1414 {
1415 memset(ccs_hdr, 0x00, sizeof(struct ccs_header_st));
1416
1417 ccs_hdr->type = *(data++);
1418 }
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-05-01 14:44:19 +0000