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The Android Open Source Project656d9c72009-03-03 19:30:25 -08001/* 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
127/* XDTLS: figure out the right values */
128static unsigned int g_probable_mtu[] = {1500 - 28, 512 - 28, 256 - 28};
129
130static unsigned int dtls1_min_mtu(void);
131static unsigned int dtls1_guess_mtu(unsigned int curr_mtu);
132static void dtls1_fix_message_header(SSL *s, unsigned long frag_off,
133 unsigned long frag_len);
134static unsigned char *dtls1_write_message_header(SSL *s,
135 unsigned char *p);
136static void dtls1_set_message_header_int(SSL *s, unsigned char mt,
137 unsigned long len, unsigned short seq_num, unsigned long frag_off,
138 unsigned long frag_len);
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800139static long dtls1_get_message_fragment(SSL *s, int st1, int stn,
140 long max, int *ok);
141
142static hm_fragment *
143dtls1_hm_fragment_new(unsigned long frag_len)
144 {
145 hm_fragment *frag = NULL;
146 unsigned char *buf = NULL;
147
148 frag = (hm_fragment *)OPENSSL_malloc(sizeof(hm_fragment));
149 if ( frag == NULL)
150 return NULL;
151
152 if (frag_len)
153 {
154 buf = (unsigned char *)OPENSSL_malloc(frag_len);
155 if ( buf == NULL)
156 {
157 OPENSSL_free(frag);
158 return NULL;
159 }
160 }
161
162 /* zero length fragment gets zero frag->fragment */
163 frag->fragment = buf;
164
165 return frag;
166 }
167
168static void
169dtls1_hm_fragment_free(hm_fragment *frag)
170 {
171 if (frag->fragment) OPENSSL_free(frag->fragment);
172 OPENSSL_free(frag);
173 }
174
175/* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */
176int dtls1_do_write(SSL *s, int type)
177 {
178 int ret;
179 int curr_mtu;
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800180 unsigned int len, frag_off, mac_size, blocksize;
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800181
182 /* AHA! Figure out the MTU, and stick to the right size */
183 if ( ! (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU))
184 {
185 s->d1->mtu =
186 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
187
188 /* I've seen the kernel return bogus numbers when it doesn't know
189 * (initial write), so just make sure we have a reasonable number */
190 if ( s->d1->mtu < dtls1_min_mtu())
191 {
192 s->d1->mtu = 0;
193 s->d1->mtu = dtls1_guess_mtu(s->d1->mtu);
194 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SET_MTU,
195 s->d1->mtu, NULL);
196 }
197 }
198#if 0
199 mtu = s->d1->mtu;
200
201 fprintf(stderr, "using MTU = %d\n", mtu);
202
203 mtu -= (DTLS1_HM_HEADER_LENGTH + DTLS1_RT_HEADER_LENGTH);
204
205 curr_mtu = mtu - BIO_wpending(SSL_get_wbio(s));
206
207 if ( curr_mtu > 0)
208 mtu = curr_mtu;
209 else if ( ( ret = BIO_flush(SSL_get_wbio(s))) <= 0)
210 return ret;
211
212 if ( BIO_wpending(SSL_get_wbio(s)) + s->init_num >= mtu)
213 {
214 ret = BIO_flush(SSL_get_wbio(s));
215 if ( ret <= 0)
216 return ret;
217 mtu = s->d1->mtu - (DTLS1_HM_HEADER_LENGTH + DTLS1_RT_HEADER_LENGTH);
218 }
219
220 OPENSSL_assert(mtu > 0); /* should have something reasonable now */
221
222#endif
223
224 if ( s->init_off == 0 && type == SSL3_RT_HANDSHAKE)
225 OPENSSL_assert(s->init_num ==
226 (int)s->d1->w_msg_hdr.msg_len + DTLS1_HM_HEADER_LENGTH);
227
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800228 if (s->write_hash)
229 mac_size = EVP_MD_size(s->write_hash);
230 else
231 mac_size = 0;
232
233 if (s->enc_write_ctx &&
234 (EVP_CIPHER_mode( s->enc_write_ctx->cipher) & EVP_CIPH_CBC_MODE))
235 blocksize = 2 * EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
236 else
237 blocksize = 0;
238
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800239 frag_off = 0;
240 while( s->init_num)
241 {
242 curr_mtu = s->d1->mtu - BIO_wpending(SSL_get_wbio(s)) -
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800243 DTLS1_RT_HEADER_LENGTH - mac_size - blocksize;
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800244
245 if ( curr_mtu <= DTLS1_HM_HEADER_LENGTH)
246 {
247 /* grr.. we could get an error if MTU picked was wrong */
248 ret = BIO_flush(SSL_get_wbio(s));
249 if ( ret <= 0)
250 return ret;
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800251 curr_mtu = s->d1->mtu - DTLS1_RT_HEADER_LENGTH -
252 mac_size - blocksize;
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800253 }
254
255 if ( s->init_num > curr_mtu)
256 len = curr_mtu;
257 else
258 len = s->init_num;
259
260
261 /* XDTLS: this function is too long. split out the CCS part */
262 if ( type == SSL3_RT_HANDSHAKE)
263 {
264 if ( s->init_off != 0)
265 {
266 OPENSSL_assert(s->init_off > DTLS1_HM_HEADER_LENGTH);
267 s->init_off -= DTLS1_HM_HEADER_LENGTH;
268 s->init_num += DTLS1_HM_HEADER_LENGTH;
269
270 /* write atleast DTLS1_HM_HEADER_LENGTH bytes */
271 if ( len <= DTLS1_HM_HEADER_LENGTH)
272 len += DTLS1_HM_HEADER_LENGTH;
273 }
274
275 dtls1_fix_message_header(s, frag_off,
276 len - DTLS1_HM_HEADER_LENGTH);
277
278 dtls1_write_message_header(s, (unsigned char *)&s->init_buf->data[s->init_off]);
279
280 OPENSSL_assert(len >= DTLS1_HM_HEADER_LENGTH);
281 }
282
283 ret=dtls1_write_bytes(s,type,&s->init_buf->data[s->init_off],
284 len);
285 if (ret < 0)
286 {
287 /* might need to update MTU here, but we don't know
288 * which previous packet caused the failure -- so can't
289 * really retransmit anything. continue as if everything
290 * is fine and wait for an alert to handle the
291 * retransmit
292 */
293 if ( BIO_ctrl(SSL_get_wbio(s),
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800294 BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL) > 0 )
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800295 s->d1->mtu = BIO_ctrl(SSL_get_wbio(s),
296 BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
297 else
298 return(-1);
299 }
300 else
301 {
302
303 /* bad if this assert fails, only part of the handshake
304 * message got sent. but why would this happen? */
305 OPENSSL_assert(len == (unsigned int)ret);
306
307 if (type == SSL3_RT_HANDSHAKE && ! s->d1->retransmitting)
308 {
309 /* should not be done for 'Hello Request's, but in that case
310 * we'll ignore the result anyway */
311 unsigned char *p = (unsigned char *)&s->init_buf->data[s->init_off];
312 const struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
313 int xlen;
314
315 if (frag_off == 0 && s->client_version != DTLS1_BAD_VER)
316 {
317 /* reconstruct message header is if it
318 * is being sent in single fragment */
319 *p++ = msg_hdr->type;
320 l2n3(msg_hdr->msg_len,p);
321 s2n (msg_hdr->seq,p);
322 l2n3(0,p);
323 l2n3(msg_hdr->msg_len,p);
324 p -= DTLS1_HM_HEADER_LENGTH;
325 xlen = ret;
326 }
327 else
328 {
329 p += DTLS1_HM_HEADER_LENGTH;
330 xlen = ret - DTLS1_HM_HEADER_LENGTH;
331 }
332
333 ssl3_finish_mac(s, p, xlen);
334 }
335
336 if (ret == s->init_num)
337 {
338 if (s->msg_callback)
339 s->msg_callback(1, s->version, type, s->init_buf->data,
340 (size_t)(s->init_off + s->init_num), s,
341 s->msg_callback_arg);
342
343 s->init_off = 0; /* done writing this message */
344 s->init_num = 0;
345
346 return(1);
347 }
348 s->init_off+=ret;
349 s->init_num-=ret;
350 frag_off += (ret -= DTLS1_HM_HEADER_LENGTH);
351 }
352 }
353 return(0);
354 }
355
356
357/* Obtain handshake message of message type 'mt' (any if mt == -1),
358 * maximum acceptable body length 'max'.
359 * Read an entire handshake message. Handshake messages arrive in
360 * fragments.
361 */
362long dtls1_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
363 {
364 int i, al;
365 struct hm_header_st *msg_hdr;
366
367 /* s3->tmp is used to store messages that are unexpected, caused
368 * by the absence of an optional handshake message */
369 if (s->s3->tmp.reuse_message)
370 {
371 s->s3->tmp.reuse_message=0;
372 if ((mt >= 0) && (s->s3->tmp.message_type != mt))
373 {
374 al=SSL_AD_UNEXPECTED_MESSAGE;
375 SSLerr(SSL_F_DTLS1_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
376 goto f_err;
377 }
378 *ok=1;
379 s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
380 s->init_num = (int)s->s3->tmp.message_size;
381 return s->init_num;
382 }
383
384 msg_hdr = &s->d1->r_msg_hdr;
385 do
386 {
387 if ( msg_hdr->frag_off == 0)
388 {
389 /* s->d1->r_message_header.msg_len = 0; */
390 memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
391 }
392
393 i = dtls1_get_message_fragment(s, st1, stn, max, ok);
394 if ( i == DTLS1_HM_BAD_FRAGMENT ||
395 i == DTLS1_HM_FRAGMENT_RETRY) /* bad fragment received */
396 continue;
397 else if ( i <= 0 && !*ok)
398 return i;
399
400 /* Note that s->init_sum is used as a counter summing
401 * up fragments' lengths: as soon as they sum up to
402 * handshake packet length, we assume we have got all
403 * the fragments. Overlapping fragments would cause
404 * premature termination, so we don't expect overlaps.
405 * Well, handling overlaps would require something more
406 * drastic. Indeed, as it is now there is no way to
407 * tell if out-of-order fragment from the middle was
408 * the last. '>=' is the best/least we can do to control
409 * the potential damage caused by malformed overlaps. */
410 if ((unsigned int)s->init_num >= msg_hdr->msg_len)
411 {
412 unsigned char *p = (unsigned char *)s->init_buf->data;
413 unsigned long msg_len = msg_hdr->msg_len;
414
415 /* reconstruct message header as if it was
416 * sent in single fragment */
417 *(p++) = msg_hdr->type;
418 l2n3(msg_len,p);
419 s2n (msg_hdr->seq,p);
420 l2n3(0,p);
421 l2n3(msg_len,p);
422 if (s->client_version != DTLS1_BAD_VER)
423 p -= DTLS1_HM_HEADER_LENGTH,
424 msg_len += DTLS1_HM_HEADER_LENGTH;
425
426 ssl3_finish_mac(s, p, msg_len);
427 if (s->msg_callback)
428 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
429 p, msg_len,
430 s, s->msg_callback_arg);
431
432 memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
433
434 s->d1->handshake_read_seq++;
435 /* we just read a handshake message from the other side:
436 * this means that we don't need to retransmit of the
437 * buffered messages.
438 * XDTLS: may be able clear out this
439 * buffer a little sooner (i.e if an out-of-order
440 * handshake message/record is received at the record
441 * layer.
442 * XDTLS: exception is that the server needs to
443 * know that change cipher spec and finished messages
444 * have been received by the client before clearing this
445 * buffer. this can simply be done by waiting for the
446 * first data segment, but is there a better way? */
447 dtls1_clear_record_buffer(s);
448
449 s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
450 return s->init_num;
451 }
452 else
453 msg_hdr->frag_off = i;
454 } while(1) ;
455
456f_err:
457 ssl3_send_alert(s,SSL3_AL_FATAL,al);
458 *ok = 0;
459 return -1;
460 }
461
462
463static int dtls1_preprocess_fragment(SSL *s,struct hm_header_st *msg_hdr,int max)
464 {
465 size_t frag_off,frag_len,msg_len;
466
467 msg_len = msg_hdr->msg_len;
468 frag_off = msg_hdr->frag_off;
469 frag_len = msg_hdr->frag_len;
470
471 /* sanity checking */
472 if ( (frag_off+frag_len) > msg_len)
473 {
474 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE);
475 return SSL_AD_ILLEGAL_PARAMETER;
476 }
477
478 if ( (frag_off+frag_len) > (unsigned long)max)
479 {
480 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE);
481 return SSL_AD_ILLEGAL_PARAMETER;
482 }
483
484 if ( s->d1->r_msg_hdr.frag_off == 0) /* first fragment */
485 {
486 /* msg_len is limited to 2^24, but is effectively checked
487 * against max above */
488 if (!BUF_MEM_grow_clean(s->init_buf,(int)msg_len+DTLS1_HM_HEADER_LENGTH))
489 {
490 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,ERR_R_BUF_LIB);
491 return SSL_AD_INTERNAL_ERROR;
492 }
493
494 s->s3->tmp.message_size = msg_len;
495 s->d1->r_msg_hdr.msg_len = msg_len;
496 s->s3->tmp.message_type = msg_hdr->type;
497 s->d1->r_msg_hdr.type = msg_hdr->type;
498 s->d1->r_msg_hdr.seq = msg_hdr->seq;
499 }
500 else if (msg_len != s->d1->r_msg_hdr.msg_len)
501 {
502 /* They must be playing with us! BTW, failure to enforce
503 * upper limit would open possibility for buffer overrun. */
504 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE);
505 return SSL_AD_ILLEGAL_PARAMETER;
506 }
507
508 return 0; /* no error */
509 }
510
511
512static int
513dtls1_retrieve_buffered_fragment(SSL *s, long max, int *ok)
514 {
515 /* (0) check whether the desired fragment is available
516 * if so:
517 * (1) copy over the fragment to s->init_buf->data[]
518 * (2) update s->init_num
519 */
520 pitem *item;
521 hm_fragment *frag;
522 int al;
523
524 *ok = 0;
525 item = pqueue_peek(s->d1->buffered_messages);
526 if ( item == NULL)
527 return 0;
528
529 frag = (hm_fragment *)item->data;
530
531 if ( s->d1->handshake_read_seq == frag->msg_header.seq)
532 {
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800533 unsigned long frag_len = frag->msg_header.frag_len;
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800534 pqueue_pop(s->d1->buffered_messages);
535
536 al=dtls1_preprocess_fragment(s,&frag->msg_header,max);
537
538 if (al==0) /* no alert */
539 {
540 unsigned char *p = (unsigned char *)s->init_buf->data+DTLS1_HM_HEADER_LENGTH;
541 memcpy(&p[frag->msg_header.frag_off],
542 frag->fragment,frag->msg_header.frag_len);
543 }
544
545 dtls1_hm_fragment_free(frag);
546 pitem_free(item);
547
548 if (al==0)
549 {
550 *ok = 1;
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800551 return frag_len;
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800552 }
553
554 ssl3_send_alert(s,SSL3_AL_FATAL,al);
555 s->init_num = 0;
556 *ok = 0;
557 return -1;
558 }
559 else
560 return 0;
561 }
562
563
564static int
565dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok)
566{
567 int i=-1;
568 hm_fragment *frag = NULL;
569 pitem *item = NULL;
570 PQ_64BIT seq64;
571 unsigned long frag_len = msg_hdr->frag_len;
572
573 if ((msg_hdr->frag_off+frag_len) > msg_hdr->msg_len)
574 goto err;
575
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800576 /* Try to find item in queue, to prevent duplicate entries */
577 pq_64bit_init(&seq64);
578 pq_64bit_assign_word(&seq64, msg_hdr->seq);
579 item = pqueue_find(s->d1->buffered_messages, seq64);
580 pq_64bit_free(&seq64);
581
582 /* Discard the message if sequence number was already there, is
583 * too far in the future, already in the queue or if we received
584 * a FINISHED before the SERVER_HELLO, which then must be a stale
585 * retransmit.
586 */
587 if (msg_hdr->seq <= s->d1->handshake_read_seq ||
588 msg_hdr->seq > s->d1->handshake_read_seq + 10 || item != NULL ||
589 (s->d1->handshake_read_seq == 0 && msg_hdr->type == SSL3_MT_FINISHED))
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800590 {
591 unsigned char devnull [256];
592
593 while (frag_len)
594 {
595 i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
596 devnull,
597 frag_len>sizeof(devnull)?sizeof(devnull):frag_len,0);
598 if (i<=0) goto err;
599 frag_len -= i;
600 }
601 }
602
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800603 if (frag_len)
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800604 {
605 frag = dtls1_hm_fragment_new(frag_len);
606 if ( frag == NULL)
607 goto err;
608
609 memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr));
610
611 /* read the body of the fragment (header has already been read) */
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800612 i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
613 frag->fragment,frag_len,0);
614 if (i<=0 || (unsigned long)i!=frag_len)
615 goto err;
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800616
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800617 pq_64bit_init(&seq64);
618 pq_64bit_assign_word(&seq64, msg_hdr->seq);
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800619
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800620 item = pitem_new(seq64, frag);
621 pq_64bit_free(&seq64);
622 if ( item == NULL)
623 goto err;
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800624
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800625 pqueue_insert(s->d1->buffered_messages, item);
626 }
627
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800628 return DTLS1_HM_FRAGMENT_RETRY;
629
630err:
631 if ( frag != NULL) dtls1_hm_fragment_free(frag);
632 if ( item != NULL) OPENSSL_free(item);
633 *ok = 0;
634 return i;
635 }
636
637
638static long
639dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok)
640 {
641 unsigned char wire[DTLS1_HM_HEADER_LENGTH];
642 unsigned long l, frag_off, frag_len;
643 int i,al;
644 struct hm_header_st msg_hdr;
645
646 /* see if we have the required fragment already */
647 if ((frag_len = dtls1_retrieve_buffered_fragment(s,max,ok)) || *ok)
648 {
649 if (*ok) s->init_num += frag_len;
650 return frag_len;
651 }
652
653 /* read handshake message header */
654 i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,wire,
655 DTLS1_HM_HEADER_LENGTH, 0);
656 if (i <= 0) /* nbio, or an error */
657 {
658 s->rwstate=SSL_READING;
659 *ok = 0;
660 return i;
661 }
662 OPENSSL_assert(i == DTLS1_HM_HEADER_LENGTH);
663
664 /* parse the message fragment header */
665 dtls1_get_message_header(wire, &msg_hdr);
666
667 /*
668 * if this is a future (or stale) message it gets buffered
669 * (or dropped)--no further processing at this time
670 */
671 if ( msg_hdr.seq != s->d1->handshake_read_seq)
672 return dtls1_process_out_of_seq_message(s, &msg_hdr, ok);
673
674 l = msg_hdr.msg_len;
675 frag_off = msg_hdr.frag_off;
676 frag_len = msg_hdr.frag_len;
677
678 if (!s->server && s->d1->r_msg_hdr.frag_off == 0 &&
679 wire[0] == SSL3_MT_HELLO_REQUEST)
680 {
681 /* The server may always send 'Hello Request' messages --
682 * we are doing a handshake anyway now, so ignore them
683 * if their format is correct. Does not count for
684 * 'Finished' MAC. */
685 if (wire[1] == 0 && wire[2] == 0 && wire[3] == 0)
686 {
687 if (s->msg_callback)
688 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
689 wire, DTLS1_HM_HEADER_LENGTH, s,
690 s->msg_callback_arg);
691
692 s->init_num = 0;
693 return dtls1_get_message_fragment(s, st1, stn,
694 max, ok);
695 }
696 else /* Incorrectly formated Hello request */
697 {
698 al=SSL_AD_UNEXPECTED_MESSAGE;
699 SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL_R_UNEXPECTED_MESSAGE);
700 goto f_err;
701 }
702 }
703
704 if ((al=dtls1_preprocess_fragment(s,&msg_hdr,max)))
705 goto f_err;
706
707 /* XDTLS: ressurect this when restart is in place */
708 s->state=stn;
709
710 if ( frag_len > 0)
711 {
712 unsigned char *p=(unsigned char *)s->init_buf->data+DTLS1_HM_HEADER_LENGTH;
713
714 i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
715 &p[frag_off],frag_len,0);
716 /* XDTLS: fix this--message fragments cannot span multiple packets */
717 if (i <= 0)
718 {
719 s->rwstate=SSL_READING;
720 *ok = 0;
721 return i;
722 }
723 }
724 else
725 i = 0;
726
727 /* XDTLS: an incorrectly formatted fragment should cause the
728 * handshake to fail */
729 OPENSSL_assert(i == (int)frag_len);
730
731 *ok = 1;
732
733 /* Note that s->init_num is *not* used as current offset in
734 * s->init_buf->data, but as a counter summing up fragments'
735 * lengths: as soon as they sum up to handshake packet
736 * length, we assume we have got all the fragments. */
737 s->init_num += frag_len;
738 return frag_len;
739
740f_err:
741 ssl3_send_alert(s,SSL3_AL_FATAL,al);
742 s->init_num = 0;
743
744 *ok=0;
745 return(-1);
746 }
747
748int dtls1_send_finished(SSL *s, int a, int b, const char *sender, int slen)
749 {
750 unsigned char *p,*d;
751 int i;
752 unsigned long l;
753
754 if (s->state == a)
755 {
756 d=(unsigned char *)s->init_buf->data;
757 p= &(d[DTLS1_HM_HEADER_LENGTH]);
758
759 i=s->method->ssl3_enc->final_finish_mac(s,
760 &(s->s3->finish_dgst1),
761 &(s->s3->finish_dgst2),
762 sender,slen,s->s3->tmp.finish_md);
763 s->s3->tmp.finish_md_len = i;
764 memcpy(p, s->s3->tmp.finish_md, i);
765 p+=i;
766 l=i;
767
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800768 /* Copy the finished so we can use it for
769 * renegotiation checks
770 */
771 if(s->type == SSL_ST_CONNECT)
772 {
773 OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
774 memcpy(s->s3->previous_client_finished,
775 s->s3->tmp.finish_md, i);
776 s->s3->previous_client_finished_len=i;
777 }
778 else
779 {
780 OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
781 memcpy(s->s3->previous_server_finished,
782 s->s3->tmp.finish_md, i);
783 s->s3->previous_server_finished_len=i;
784 }
785
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800786#ifdef OPENSSL_SYS_WIN16
787 /* MSVC 1.5 does not clear the top bytes of the word unless
788 * I do this.
789 */
790 l&=0xffff;
791#endif
792
793 d = dtls1_set_message_header(s, d, SSL3_MT_FINISHED, l, 0, l);
794 s->init_num=(int)l+DTLS1_HM_HEADER_LENGTH;
795 s->init_off=0;
796
797 /* buffer the message to handle re-xmits */
798 dtls1_buffer_message(s, 0);
799
800 s->state=b;
801 }
802
803 /* SSL3_ST_SEND_xxxxxx_HELLO_B */
804 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
805 }
806
807/* for these 2 messages, we need to
808 * ssl->enc_read_ctx re-init
809 * ssl->s3->read_sequence zero
810 * ssl->s3->read_mac_secret re-init
811 * ssl->session->read_sym_enc assign
812 * ssl->session->read_compression assign
813 * ssl->session->read_hash assign
814 */
815int dtls1_send_change_cipher_spec(SSL *s, int a, int b)
816 {
817 unsigned char *p;
818
819 if (s->state == a)
820 {
821 p=(unsigned char *)s->init_buf->data;
822 *p++=SSL3_MT_CCS;
823 s->d1->handshake_write_seq = s->d1->next_handshake_write_seq;
824 s->init_num=DTLS1_CCS_HEADER_LENGTH;
825
826 if (s->client_version == DTLS1_BAD_VER)
827 {
828 s->d1->next_handshake_write_seq++;
829 s2n(s->d1->handshake_write_seq,p);
830 s->init_num+=2;
831 }
832
833 s->init_off=0;
834
835 dtls1_set_message_header_int(s, SSL3_MT_CCS, 0,
836 s->d1->handshake_write_seq, 0, 0);
837
838 /* buffer the message to handle re-xmits */
839 dtls1_buffer_message(s, 1);
840
841 s->state=b;
842 }
843
844 /* SSL3_ST_CW_CHANGE_B */
845 return(dtls1_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
846 }
847
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800848static int dtls1_add_cert_to_buf(BUF_MEM *buf, unsigned long *l, X509 *x)
849 {
850 int n;
851 unsigned char *p;
852
853 n=i2d_X509(x,NULL);
854 if (!BUF_MEM_grow_clean(buf,(int)(n+(*l)+3)))
855 {
856 SSLerr(SSL_F_DTLS1_ADD_CERT_TO_BUF,ERR_R_BUF_LIB);
857 return 0;
858 }
859 p=(unsigned char *)&(buf->data[*l]);
860 l2n3(n,p);
861 i2d_X509(x,&p);
862 *l+=n+3;
863
864 return 1;
865 }
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800866unsigned long dtls1_output_cert_chain(SSL *s, X509 *x)
867 {
868 unsigned char *p;
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800869 int i;
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800870 unsigned long l= 3 + DTLS1_HM_HEADER_LENGTH;
871 BUF_MEM *buf;
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800872
873 /* TLSv1 sends a chain with nothing in it, instead of an alert */
874 buf=s->init_buf;
875 if (!BUF_MEM_grow_clean(buf,10))
876 {
877 SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
878 return(0);
879 }
880 if (x != NULL)
881 {
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800882 X509_STORE_CTX xs_ctx;
883
884 if (!X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,x,NULL))
885 {
886 SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_X509_LIB);
887 return(0);
888 }
889
890 X509_verify_cert(&xs_ctx);
891 for (i=0; i < sk_X509_num(xs_ctx.chain); i++)
892 {
893 x = sk_X509_value(xs_ctx.chain, i);
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800894
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800895 if (!dtls1_add_cert_to_buf(buf, &l, x))
896 {
897 X509_STORE_CTX_cleanup(&xs_ctx);
898 return 0;
899 }
900 }
901 X509_STORE_CTX_cleanup(&xs_ctx);
902 }
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800903 /* Thawte special :-) */
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800904 for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++)
905 {
906 x=sk_X509_value(s->ctx->extra_certs,i);
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800907 if (!dtls1_add_cert_to_buf(buf, &l, x))
908 return 0;
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800909 }
910
911 l-= (3 + DTLS1_HM_HEADER_LENGTH);
912
913 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
914 l2n3(l,p);
915 l+=3;
916 p=(unsigned char *)&(buf->data[0]);
917 p = dtls1_set_message_header(s, p, SSL3_MT_CERTIFICATE, l, 0, l);
918
919 l+=DTLS1_HM_HEADER_LENGTH;
920 return(l);
921 }
922
923int dtls1_read_failed(SSL *s, int code)
924 {
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800925 if ( code > 0)
926 {
927 fprintf( stderr, "invalid state reached %s:%d", __FILE__, __LINE__);
928 return 1;
929 }
930
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800931 if (!dtls1_is_timer_expired(s))
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800932 {
933 /* not a timeout, none of our business,
934 let higher layers handle this. in fact it's probably an error */
935 return code;
936 }
937
938 if ( ! SSL_in_init(s)) /* done, no need to send a retransmit */
939 {
940 BIO_set_flags(SSL_get_rbio(s), BIO_FLAGS_READ);
941 return code;
942 }
943
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800944#if 0 /* for now, each alert contains only one record number */
945 item = pqueue_peek(state->rcvd_records);
946 if ( item )
947 {
948 /* send an alert immediately for all the missing records */
949 }
950 else
951#endif
952
953#if 0 /* no more alert sending, just retransmit the last set of messages */
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800954 if ( state->timeout.read_timeouts >= DTLS1_TMO_READ_COUNT)
955 ssl3_send_alert(s,SSL3_AL_WARNING,
956 DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800957#endif
958
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800959 return dtls1_handle_timeout(s);
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800960 }
961
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800962int
963dtls1_get_queue_priority(unsigned short seq, int is_ccs)
964 {
965 /* The index of the retransmission queue actually is the message sequence number,
966 * since the queue only contains messages of a single handshake. However, the
967 * ChangeCipherSpec has no message sequence number and so using only the sequence
968 * will result in the CCS and Finished having the same index. To prevent this,
969 * the sequence number is multiplied by 2. In case of a CCS 1 is subtracted.
970 * This does not only differ CSS and Finished, it also maintains the order of the
971 * index (important for priority queues) and fits in the unsigned short variable.
972 */
973 return seq * 2 - is_ccs;
974 }
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800975
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800976int
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800977dtls1_retransmit_buffered_messages(SSL *s)
978 {
979 pqueue sent = s->d1->sent_messages;
980 piterator iter;
981 pitem *item;
982 hm_fragment *frag;
983 int found = 0;
984
985 iter = pqueue_iterator(sent);
986
987 for ( item = pqueue_next(&iter); item != NULL; item = pqueue_next(&iter))
988 {
989 frag = (hm_fragment *)item->data;
Brian Carlstrom98d58bb2010-03-09 09:56:55 -0800990 if ( dtls1_retransmit_message(s,
991 (unsigned short)dtls1_get_queue_priority(frag->msg_header.seq, frag->msg_header.is_ccs),
992 0, &found) <= 0 && found)
The Android Open Source Project656d9c72009-03-03 19:30:25 -0800993 {
994 fprintf(stderr, "dtls1_retransmit_message() failed\n");
995 return -1;
996 }
997 }
998
999 return 1;
1000 }
1001
1002int
1003dtls1_buffer_message(SSL *s, int is_ccs)
1004 {
1005 pitem *item;
1006 hm_fragment *frag;
1007 PQ_64BIT seq64;
The Android Open Source Project656d9c72009-03-03 19:30:25 -08001008
1009 /* this function is called immediately after a message has
1010 * been serialized */
1011 OPENSSL_assert(s->init_off == 0);
1012
1013 frag = dtls1_hm_fragment_new(s->init_num);
1014
1015 memcpy(frag->fragment, s->init_buf->data, s->init_num);
1016
1017 if ( is_ccs)
1018 {
1019 OPENSSL_assert(s->d1->w_msg_hdr.msg_len +
1020 DTLS1_CCS_HEADER_LENGTH <= (unsigned int)s->init_num);
The Android Open Source Project656d9c72009-03-03 19:30:25 -08001021 }
1022 else
1023 {
1024 OPENSSL_assert(s->d1->w_msg_hdr.msg_len +
1025 DTLS1_HM_HEADER_LENGTH == (unsigned int)s->init_num);
1026 }
1027
1028 frag->msg_header.msg_len = s->d1->w_msg_hdr.msg_len;
1029 frag->msg_header.seq = s->d1->w_msg_hdr.seq;
1030 frag->msg_header.type = s->d1->w_msg_hdr.type;
1031 frag->msg_header.frag_off = 0;
1032 frag->msg_header.frag_len = s->d1->w_msg_hdr.msg_len;
1033 frag->msg_header.is_ccs = is_ccs;
1034
Brian Carlstrom98d58bb2010-03-09 09:56:55 -08001035 /* save current state*/
1036 frag->msg_header.saved_retransmit_state.enc_write_ctx = s->enc_write_ctx;
1037 frag->msg_header.saved_retransmit_state.write_hash = s->write_hash;
1038 frag->msg_header.saved_retransmit_state.compress = s->compress;
1039 frag->msg_header.saved_retransmit_state.session = s->session;
1040 frag->msg_header.saved_retransmit_state.epoch = s->d1->w_epoch;
The Android Open Source Project656d9c72009-03-03 19:30:25 -08001041
Brian Carlstrom98d58bb2010-03-09 09:56:55 -08001042 pq_64bit_init(&seq64);
1043
1044 pq_64bit_assign_word(&seq64,
1045 dtls1_get_queue_priority(frag->msg_header.seq,
1046 frag->msg_header.is_ccs));
1047
The Android Open Source Project656d9c72009-03-03 19:30:25 -08001048 item = pitem_new(seq64, frag);
1049 pq_64bit_free(&seq64);
1050 if ( item == NULL)
1051 {
1052 dtls1_hm_fragment_free(frag);
1053 return 0;
1054 }
1055
1056#if 0
1057 fprintf( stderr, "buffered messge: \ttype = %xx\n", msg_buf->type);
1058 fprintf( stderr, "\t\t\t\t\tlen = %d\n", msg_buf->len);
1059 fprintf( stderr, "\t\t\t\t\tseq_num = %d\n", msg_buf->seq_num);
1060#endif
1061
1062 pqueue_insert(s->d1->sent_messages, item);
1063 return 1;
1064 }
1065
1066int
1067dtls1_retransmit_message(SSL *s, unsigned short seq, unsigned long frag_off,
1068 int *found)
1069 {
1070 int ret;
1071 /* XDTLS: for now assuming that read/writes are blocking */
1072 pitem *item;
1073 hm_fragment *frag ;
1074 unsigned long header_length;
1075 PQ_64BIT seq64;
Brian Carlstrom98d58bb2010-03-09 09:56:55 -08001076 struct dtls1_retransmit_state saved_state;
1077 unsigned char save_write_sequence[8];
The Android Open Source Project656d9c72009-03-03 19:30:25 -08001078
1079 /*
1080 OPENSSL_assert(s->init_num == 0);
1081 OPENSSL_assert(s->init_off == 0);
1082 */
1083
1084 /* XDTLS: the requested message ought to be found, otherwise error */
1085 pq_64bit_init(&seq64);
1086 pq_64bit_assign_word(&seq64, seq);
1087
1088 item = pqueue_find(s->d1->sent_messages, seq64);
1089 pq_64bit_free(&seq64);
1090 if ( item == NULL)
1091 {
1092 fprintf(stderr, "retransmit: message %d non-existant\n", seq);
1093 *found = 0;
1094 return 0;
1095 }
1096
1097 *found = 1;
1098 frag = (hm_fragment *)item->data;
1099
1100 if ( frag->msg_header.is_ccs)
1101 header_length = DTLS1_CCS_HEADER_LENGTH;
1102 else
1103 header_length = DTLS1_HM_HEADER_LENGTH;
1104
1105 memcpy(s->init_buf->data, frag->fragment,
1106 frag->msg_header.msg_len + header_length);
1107 s->init_num = frag->msg_header.msg_len + header_length;
1108
1109 dtls1_set_message_header_int(s, frag->msg_header.type,
1110 frag->msg_header.msg_len, frag->msg_header.seq, 0,
1111 frag->msg_header.frag_len);
1112
Brian Carlstrom98d58bb2010-03-09 09:56:55 -08001113 /* save current state */
1114 saved_state.enc_write_ctx = s->enc_write_ctx;
1115 saved_state.write_hash = s->write_hash;
1116 saved_state.compress = s->compress;
1117 saved_state.session = s->session;
1118 saved_state.epoch = s->d1->w_epoch;
1119 saved_state.epoch = s->d1->w_epoch;
1120
The Android Open Source Project656d9c72009-03-03 19:30:25 -08001121 s->d1->retransmitting = 1;
Brian Carlstrom98d58bb2010-03-09 09:56:55 -08001122
1123 /* restore state in which the message was originally sent */
1124 s->enc_write_ctx = frag->msg_header.saved_retransmit_state.enc_write_ctx;
1125 s->write_hash = frag->msg_header.saved_retransmit_state.write_hash;
1126 s->compress = frag->msg_header.saved_retransmit_state.compress;
1127 s->session = frag->msg_header.saved_retransmit_state.session;
1128 s->d1->w_epoch = frag->msg_header.saved_retransmit_state.epoch;
1129
1130 if (frag->msg_header.saved_retransmit_state.epoch == saved_state.epoch - 1)
1131 {
1132 memcpy(save_write_sequence, s->s3->write_sequence, sizeof(s->s3->write_sequence));
1133 memcpy(s->s3->write_sequence, s->d1->last_write_sequence, sizeof(s->s3->write_sequence));
1134 }
1135
The Android Open Source Project656d9c72009-03-03 19:30:25 -08001136 ret = dtls1_do_write(s, frag->msg_header.is_ccs ?
Brian Carlstrom98d58bb2010-03-09 09:56:55 -08001137 SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE);
1138
1139 /* restore current state */
1140 s->enc_write_ctx = saved_state.enc_write_ctx;
1141 s->write_hash = saved_state.write_hash;
1142 s->compress = saved_state.compress;
1143 s->session = saved_state.session;
1144 s->d1->w_epoch = saved_state.epoch;
1145
1146 if (frag->msg_header.saved_retransmit_state.epoch == saved_state.epoch - 1)
1147 {
1148 memcpy(s->d1->last_write_sequence, s->s3->write_sequence, sizeof(s->s3->write_sequence));
1149 memcpy(s->s3->write_sequence, save_write_sequence, sizeof(s->s3->write_sequence));
1150 }
1151
The Android Open Source Project656d9c72009-03-03 19:30:25 -08001152 s->d1->retransmitting = 0;
1153
1154 (void)BIO_flush(SSL_get_wbio(s));
1155 return ret;
1156 }
1157
1158/* call this function when the buffered messages are no longer needed */
1159void
1160dtls1_clear_record_buffer(SSL *s)
1161 {
1162 pitem *item;
1163
1164 for(item = pqueue_pop(s->d1->sent_messages);
1165 item != NULL; item = pqueue_pop(s->d1->sent_messages))
1166 {
1167 dtls1_hm_fragment_free((hm_fragment *)item->data);
1168 pitem_free(item);
1169 }
1170 }
1171
1172
1173unsigned char *
1174dtls1_set_message_header(SSL *s, unsigned char *p, unsigned char mt,
1175 unsigned long len, unsigned long frag_off, unsigned long frag_len)
1176 {
1177 if ( frag_off == 0)
1178 {
1179 s->d1->handshake_write_seq = s->d1->next_handshake_write_seq;
1180 s->d1->next_handshake_write_seq++;
1181 }
1182
1183 dtls1_set_message_header_int(s, mt, len, s->d1->handshake_write_seq,
1184 frag_off, frag_len);
1185
1186 return p += DTLS1_HM_HEADER_LENGTH;
1187 }
1188
1189
1190/* don't actually do the writing, wait till the MTU has been retrieved */
1191static void
1192dtls1_set_message_header_int(SSL *s, unsigned char mt,
1193 unsigned long len, unsigned short seq_num, unsigned long frag_off,
1194 unsigned long frag_len)
1195 {
1196 struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
1197
1198 msg_hdr->type = mt;
1199 msg_hdr->msg_len = len;
1200 msg_hdr->seq = seq_num;
1201 msg_hdr->frag_off = frag_off;
1202 msg_hdr->frag_len = frag_len;
1203 }
1204
1205static void
1206dtls1_fix_message_header(SSL *s, unsigned long frag_off,
1207 unsigned long frag_len)
1208 {
1209 struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
1210
1211 msg_hdr->frag_off = frag_off;
1212 msg_hdr->frag_len = frag_len;
1213 }
1214
1215static unsigned char *
1216dtls1_write_message_header(SSL *s, unsigned char *p)
1217 {
1218 struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
1219
1220 *p++ = msg_hdr->type;
1221 l2n3(msg_hdr->msg_len, p);
1222
1223 s2n(msg_hdr->seq, p);
1224 l2n3(msg_hdr->frag_off, p);
1225 l2n3(msg_hdr->frag_len, p);
1226
1227 return p;
1228 }
1229
1230static unsigned int
1231dtls1_min_mtu(void)
1232 {
1233 return (g_probable_mtu[(sizeof(g_probable_mtu) /
1234 sizeof(g_probable_mtu[0])) - 1]);
1235 }
1236
1237static unsigned int
1238dtls1_guess_mtu(unsigned int curr_mtu)
1239 {
1240 size_t i;
1241
1242 if ( curr_mtu == 0 )
1243 return g_probable_mtu[0] ;
1244
1245 for ( i = 0; i < sizeof(g_probable_mtu)/sizeof(g_probable_mtu[0]); i++)
1246 if ( curr_mtu > g_probable_mtu[i])
1247 return g_probable_mtu[i];
1248
1249 return curr_mtu;
1250 }
1251
1252void
1253dtls1_get_message_header(unsigned char *data, struct hm_header_st *msg_hdr)
1254 {
1255 memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
1256 msg_hdr->type = *(data++);
1257 n2l3(data, msg_hdr->msg_len);
1258
1259 n2s(data, msg_hdr->seq);
1260 n2l3(data, msg_hdr->frag_off);
1261 n2l3(data, msg_hdr->frag_len);
1262 }
1263
1264void
1265dtls1_get_ccs_header(unsigned char *data, struct ccs_header_st *ccs_hdr)
1266 {
1267 memset(ccs_hdr, 0x00, sizeof(struct ccs_header_st));
1268
1269 ccs_hdr->type = *(data++);
1270 }