1 /* $OpenBSD: d1_both.c,v 1.52 2017/10/08 16:24:02 jsing Exp $ */
3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
6 /* ====================================================================
7 * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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 * ====================================================================
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).
59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60 * All rights reserved.
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.
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).
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.
80 * Redistribution and use in source and binary forms, with or without
81 * modification, are permitted provided that the following conditions
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)"
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
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.]
120 #include "ssl_locl.h"
122 #include <openssl/buffer.h>
123 #include <openssl/evp.h>
124 #include <openssl/objects.h>
125 #include <openssl/x509.h>
128 #include "bytestring.h"
130 #define RSMBLY_BITMASK_SIZE(msg_len) (((msg_len) + 7) / 8)
132 #define RSMBLY_BITMASK_MARK(bitmask, start, end) { \
133 if ((end) - (start) <= 8) { \
135 for (ii = (start); ii < (end); ii++) bitmask[((ii) >> 3)] |= (1 << ((ii) & 7)); \
138 bitmask[((start) >> 3)] |= bitmask_start_values[((start) & 7)]; \
139 for (ii = (((start) >> 3) + 1); ii < ((((end) - 1)) >> 3); ii++) bitmask[ii] = 0xff; \
140 bitmask[(((end) - 1) >> 3)] |= bitmask_end_values[((end) & 7)]; \
143 #define RSMBLY_BITMASK_IS_COMPLETE(bitmask, msg_len, is_complete) { \
145 OPENSSL_assert((msg_len) > 0); \
147 if (bitmask[(((msg_len) - 1) >> 3)] != bitmask_end_values[((msg_len) & 7)]) is_complete = 0; \
148 if (is_complete) for (ii = (((msg_len) - 1) >> 3) - 1; ii >= 0 ; ii--) \
149 if (bitmask[ii] != 0xff) { is_complete = 0; break; } }
151 static unsigned char bitmask_start_values
[] = {
152 0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80
154 static unsigned char bitmask_end_values
[] = {
155 0xff, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f
158 /* XDTLS: figure out the right values */
159 static unsigned int g_probable_mtu
[] = {1500 - 28, 512 - 28, 256 - 28};
161 static unsigned int dtls1_guess_mtu(unsigned int curr_mtu
);
162 static void dtls1_fix_message_header(SSL
*s
, unsigned long frag_off
,
163 unsigned long frag_len
);
164 static unsigned char *dtls1_write_message_header(SSL
*s
, unsigned char *p
);
165 static long dtls1_get_message_fragment(SSL
*s
, int st1
, int stn
, long max
,
169 dtls1_hm_fragment_new(unsigned long frag_len
, int reassembly
)
171 hm_fragment
*frag
= NULL
;
172 unsigned char *buf
= NULL
;
173 unsigned char *bitmask
= NULL
;
175 frag
= malloc(sizeof(hm_fragment
));
180 buf
= malloc(frag_len
);
187 /* zero length fragment gets zero frag->fragment */
188 frag
->fragment
= buf
;
190 /* Initialize reassembly bitmask if necessary */
192 bitmask
= malloc(RSMBLY_BITMASK_SIZE(frag_len
));
193 if (bitmask
== NULL
) {
198 memset(bitmask
, 0, RSMBLY_BITMASK_SIZE(frag_len
));
201 frag
->reassembly
= bitmask
;
207 dtls1_hm_fragment_free(hm_fragment
*frag
)
212 if (frag
->msg_header
.is_ccs
) {
214 frag
->msg_header
.saved_retransmit_state
.enc_write_ctx
);
216 frag
->msg_header
.saved_retransmit_state
.write_hash
);
218 free(frag
->fragment
);
219 free(frag
->reassembly
);
223 /* send s->internal->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */
225 dtls1_do_write(SSL
*s
, int type
)
229 unsigned int len
, frag_off
, mac_size
, blocksize
;
231 /* AHA! Figure out the MTU, and stick to the right size */
232 if (D1I(s
)->mtu
< dtls1_min_mtu() &&
233 !(SSL_get_options(s
) & SSL_OP_NO_QUERY_MTU
)) {
234 D1I(s
)->mtu
= BIO_ctrl(SSL_get_wbio(s
),
235 BIO_CTRL_DGRAM_QUERY_MTU
, 0, NULL
);
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
242 if (D1I(s
)->mtu
< dtls1_min_mtu()) {
244 D1I(s
)->mtu
= dtls1_guess_mtu(D1I(s
)->mtu
);
245 BIO_ctrl(SSL_get_wbio(s
), BIO_CTRL_DGRAM_SET_MTU
,
250 OPENSSL_assert(D1I(s
)->mtu
>= dtls1_min_mtu());
251 /* should have something reasonable now */
253 if (s
->internal
->init_off
== 0 && type
== SSL3_RT_HANDSHAKE
)
254 OPENSSL_assert(s
->internal
->init_num
==
255 (int)D1I(s
)->w_msg_hdr
.msg_len
+ DTLS1_HM_HEADER_LENGTH
);
257 if (s
->internal
->write_hash
)
258 mac_size
= EVP_MD_CTX_size(s
->internal
->write_hash
);
262 if (s
->internal
->enc_write_ctx
&&
263 (EVP_CIPHER_mode( s
->internal
->enc_write_ctx
->cipher
) & EVP_CIPH_CBC_MODE
))
264 blocksize
= 2 * EVP_CIPHER_block_size(s
->internal
->enc_write_ctx
->cipher
);
269 while (s
->internal
->init_num
) {
270 curr_mtu
= D1I(s
)->mtu
- BIO_wpending(SSL_get_wbio(s
)) -
271 DTLS1_RT_HEADER_LENGTH
- mac_size
- blocksize
;
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
));
278 curr_mtu
= D1I(s
)->mtu
- DTLS1_RT_HEADER_LENGTH
-
279 mac_size
- blocksize
;
282 if (s
->internal
->init_num
> curr_mtu
)
285 len
= s
->internal
->init_num
;
288 /* XDTLS: this function is too long. split out the CCS part */
289 if (type
== SSL3_RT_HANDSHAKE
) {
290 if (s
->internal
->init_off
!= 0) {
291 OPENSSL_assert(s
->internal
->init_off
> DTLS1_HM_HEADER_LENGTH
);
292 s
->internal
->init_off
-= DTLS1_HM_HEADER_LENGTH
;
293 s
->internal
->init_num
+= DTLS1_HM_HEADER_LENGTH
;
295 if (s
->internal
->init_num
> curr_mtu
)
298 len
= s
->internal
->init_num
;
301 dtls1_fix_message_header(s
, frag_off
,
302 len
- DTLS1_HM_HEADER_LENGTH
);
304 dtls1_write_message_header(s
,
305 (unsigned char *)&s
->internal
->init_buf
->data
[s
->internal
->init_off
]);
307 OPENSSL_assert(len
>= DTLS1_HM_HEADER_LENGTH
);
310 ret
= dtls1_write_bytes(s
, type
,
311 &s
->internal
->init_buf
->data
[s
->internal
->init_off
], len
);
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
320 if (BIO_ctrl(SSL_get_wbio(s
),
321 BIO_CTRL_DGRAM_MTU_EXCEEDED
, 0, NULL
) > 0)
322 D1I(s
)->mtu
= BIO_ctrl(SSL_get_wbio(s
),
323 BIO_CTRL_DGRAM_QUERY_MTU
, 0, NULL
);
329 * Bad if this assert fails, only part of the
330 * handshake message got sent. but why would
333 OPENSSL_assert(len
== (unsigned int)ret
);
335 if (type
== SSL3_RT_HANDSHAKE
&&
336 !D1I(s
)->retransmitting
) {
338 * Should not be done for 'Hello Request's,
339 * but in that case we'll ignore the result
342 unsigned char *p
= (unsigned char *)&s
->internal
->init_buf
->data
[s
->internal
->init_off
];
343 const struct hm_header_st
*msg_hdr
= &D1I(s
)->w_msg_hdr
;
348 * Reconstruct message header is if it
349 * is being sent in single fragment
351 *p
++ = msg_hdr
->type
;
352 l2n3(msg_hdr
->msg_len
, p
);
353 s2n (msg_hdr
->seq
, p
);
355 l2n3(msg_hdr
->msg_len
, p
);
356 p
-= DTLS1_HM_HEADER_LENGTH
;
359 p
+= DTLS1_HM_HEADER_LENGTH
;
360 xlen
= ret
- DTLS1_HM_HEADER_LENGTH
;
363 tls1_finish_mac(s
, p
, xlen
);
366 if (ret
== s
->internal
->init_num
) {
367 if (s
->internal
->msg_callback
)
368 s
->internal
->msg_callback(1, s
->version
, type
,
369 s
->internal
->init_buf
->data
,
370 (size_t)(s
->internal
->init_off
+ s
->internal
->init_num
),
371 s
, s
->internal
->msg_callback_arg
);
373 s
->internal
->init_off
= 0;
374 /* done writing this message */
375 s
->internal
->init_num
= 0;
379 s
->internal
->init_off
+= ret
;
380 s
->internal
->init_num
-= ret
;
381 frag_off
+= (ret
-= DTLS1_HM_HEADER_LENGTH
);
389 * Obtain handshake message of message type 'mt' (any if mt == -1),
390 * maximum acceptable body length 'max'.
391 * Read an entire handshake message. Handshake messages arrive in
395 dtls1_get_message(SSL
*s
, int st1
, int stn
, int mt
, long max
, int *ok
)
398 struct hm_header_st
*msg_hdr
;
400 unsigned long msg_len
;
403 * s3->internal->tmp is used to store messages that are unexpected, caused
404 * by the absence of an optional handshake message
406 if (S3I(s
)->tmp
.reuse_message
) {
407 S3I(s
)->tmp
.reuse_message
= 0;
408 if ((mt
>= 0) && (S3I(s
)->tmp
.message_type
!= mt
)) {
409 al
= SSL_AD_UNEXPECTED_MESSAGE
;
410 SSLerror(s
, SSL_R_UNEXPECTED_MESSAGE
);
414 s
->internal
->init_msg
= s
->internal
->init_buf
->data
+ DTLS1_HM_HEADER_LENGTH
;
415 s
->internal
->init_num
= (int)S3I(s
)->tmp
.message_size
;
416 return s
->internal
->init_num
;
419 msg_hdr
= &D1I(s
)->r_msg_hdr
;
420 memset(msg_hdr
, 0x00, sizeof(struct hm_header_st
));
423 i
= dtls1_get_message_fragment(s
, st1
, stn
, max
, ok
);
424 if (i
== DTLS1_HM_BAD_FRAGMENT
||
425 i
== DTLS1_HM_FRAGMENT_RETRY
) /* bad fragment received */
427 else if (i
<= 0 && !*ok
)
430 p
= (unsigned char *)s
->internal
->init_buf
->data
;
431 msg_len
= msg_hdr
->msg_len
;
433 /* reconstruct message header */
434 *(p
++) = msg_hdr
->type
;
436 s2n (msg_hdr
->seq
, p
);
440 p
-= DTLS1_HM_HEADER_LENGTH
;
441 msg_len
+= DTLS1_HM_HEADER_LENGTH
;
443 tls1_finish_mac(s
, p
, msg_len
);
444 if (s
->internal
->msg_callback
)
445 s
->internal
->msg_callback(0, s
->version
, SSL3_RT_HANDSHAKE
, p
, msg_len
,
446 s
, s
->internal
->msg_callback_arg
);
448 memset(msg_hdr
, 0x00, sizeof(struct hm_header_st
));
450 /* Don't change sequence numbers while listening */
452 D1I(s
)->handshake_read_seq
++;
454 s
->internal
->init_msg
= s
->internal
->init_buf
->data
+ DTLS1_HM_HEADER_LENGTH
;
455 return s
->internal
->init_num
;
458 ssl3_send_alert(s
, SSL3_AL_FATAL
, al
);
465 dtls1_preprocess_fragment(SSL
*s
, struct hm_header_st
*msg_hdr
, int max
)
467 size_t frag_off
, frag_len
, msg_len
;
469 msg_len
= msg_hdr
->msg_len
;
470 frag_off
= msg_hdr
->frag_off
;
471 frag_len
= msg_hdr
->frag_len
;
473 /* sanity checking */
474 if ((frag_off
+ frag_len
) > msg_len
) {
475 SSLerror(s
, SSL_R_EXCESSIVE_MESSAGE_SIZE
);
476 return SSL_AD_ILLEGAL_PARAMETER
;
479 if ((frag_off
+ frag_len
) > (unsigned long)max
) {
480 SSLerror(s
, SSL_R_EXCESSIVE_MESSAGE_SIZE
);
481 return SSL_AD_ILLEGAL_PARAMETER
;
484 if ( D1I(s
)->r_msg_hdr
.frag_off
== 0) /* first fragment */
487 * msg_len is limited to 2^24, but is effectively checked
490 if (!BUF_MEM_grow_clean(s
->internal
->init_buf
,
491 msg_len
+ DTLS1_HM_HEADER_LENGTH
)) {
492 SSLerror(s
, ERR_R_BUF_LIB
);
493 return SSL_AD_INTERNAL_ERROR
;
496 S3I(s
)->tmp
.message_size
= msg_len
;
497 D1I(s
)->r_msg_hdr
.msg_len
= msg_len
;
498 S3I(s
)->tmp
.message_type
= msg_hdr
->type
;
499 D1I(s
)->r_msg_hdr
.type
= msg_hdr
->type
;
500 D1I(s
)->r_msg_hdr
.seq
= msg_hdr
->seq
;
501 } else if (msg_len
!= D1I(s
)->r_msg_hdr
.msg_len
) {
503 * They must be playing with us! BTW, failure to enforce
504 * upper limit would open possibility for buffer overrun.
506 SSLerror(s
, SSL_R_EXCESSIVE_MESSAGE_SIZE
);
507 return SSL_AD_ILLEGAL_PARAMETER
;
510 return 0; /* no error */
514 dtls1_retrieve_buffered_fragment(SSL
*s
, long max
, int *ok
)
517 * (0) check whether the desired fragment is available
519 * (1) copy over the fragment to s->internal->init_buf->data[]
520 * (2) update s->internal->init_num
527 item
= pqueue_peek(D1I(s
)->buffered_messages
);
531 frag
= (hm_fragment
*)item
->data
;
533 /* Don't return if reassembly still in progress */
534 if (frag
->reassembly
!= NULL
)
537 if (D1I(s
)->handshake_read_seq
== frag
->msg_header
.seq
) {
538 unsigned long frag_len
= frag
->msg_header
.frag_len
;
539 pqueue_pop(D1I(s
)->buffered_messages
);
541 al
= dtls1_preprocess_fragment(s
, &frag
->msg_header
, max
);
543 if (al
== 0) /* no alert */
545 unsigned char *p
= (unsigned char *)s
->internal
->init_buf
->data
+ DTLS1_HM_HEADER_LENGTH
;
546 memcpy(&p
[frag
->msg_header
.frag_off
],
547 frag
->fragment
, frag
->msg_header
.frag_len
);
550 dtls1_hm_fragment_free(frag
);
558 ssl3_send_alert(s
, SSL3_AL_FATAL
, al
);
559 s
->internal
->init_num
= 0;
567 * dtls1_max_handshake_message_len returns the maximum number of bytes
568 * permitted in a DTLS handshake message for |s|. The minimum is 16KB,
569 * but may be greater if the maximum certificate list size requires it.
572 dtls1_max_handshake_message_len(const SSL
*s
)
574 unsigned long max_len
;
576 max_len
= DTLS1_HM_HEADER_LENGTH
+ SSL3_RT_MAX_ENCRYPTED_LENGTH
;
577 if (max_len
< (unsigned long)s
->internal
->max_cert_list
)
578 return s
->internal
->max_cert_list
;
583 dtls1_reassemble_fragment(SSL
*s
, struct hm_header_st
* msg_hdr
, int *ok
)
585 hm_fragment
*frag
= NULL
;
587 int i
= -1, is_complete
;
588 unsigned char seq64be
[8];
589 unsigned long frag_len
= msg_hdr
->frag_len
;
591 if ((msg_hdr
->frag_off
+ frag_len
) > msg_hdr
->msg_len
||
592 msg_hdr
->msg_len
> dtls1_max_handshake_message_len(s
))
596 i
= DTLS1_HM_FRAGMENT_RETRY
;
600 /* Try to find item in queue */
601 memset(seq64be
, 0, sizeof(seq64be
));
602 seq64be
[6] = (unsigned char)(msg_hdr
->seq
>> 8);
603 seq64be
[7] = (unsigned char)msg_hdr
->seq
;
604 item
= pqueue_find(D1I(s
)->buffered_messages
, seq64be
);
607 frag
= dtls1_hm_fragment_new(msg_hdr
->msg_len
, 1);
610 memcpy(&(frag
->msg_header
), msg_hdr
, sizeof(*msg_hdr
));
611 frag
->msg_header
.frag_len
= frag
->msg_header
.msg_len
;
612 frag
->msg_header
.frag_off
= 0;
614 frag
= (hm_fragment
*)item
->data
;
615 if (frag
->msg_header
.msg_len
!= msg_hdr
->msg_len
) {
623 * If message is already reassembled, this must be a
624 * retransmit and can be dropped.
626 if (frag
->reassembly
== NULL
) {
627 unsigned char devnull
[256];
630 i
= s
->method
->internal
->ssl_read_bytes(s
, SSL3_RT_HANDSHAKE
,
631 devnull
, frag_len
> sizeof(devnull
) ?
632 sizeof(devnull
) : frag_len
, 0);
637 i
= DTLS1_HM_FRAGMENT_RETRY
;
641 /* read the body of the fragment (header has already been read */
642 i
= s
->method
->internal
->ssl_read_bytes(s
, SSL3_RT_HANDSHAKE
,
643 frag
->fragment
+ msg_hdr
->frag_off
, frag_len
, 0);
644 if (i
<= 0 || (unsigned long)i
!= frag_len
)
647 RSMBLY_BITMASK_MARK(frag
->reassembly
, (long)msg_hdr
->frag_off
,
648 (long)(msg_hdr
->frag_off
+ frag_len
));
650 RSMBLY_BITMASK_IS_COMPLETE(frag
->reassembly
, (long)msg_hdr
->msg_len
,
654 free(frag
->reassembly
);
655 frag
->reassembly
= NULL
;
659 memset(seq64be
, 0, sizeof(seq64be
));
660 seq64be
[6] = (unsigned char)(msg_hdr
->seq
>> 8);
661 seq64be
[7] = (unsigned char)(msg_hdr
->seq
);
663 item
= pitem_new(seq64be
, frag
);
669 pqueue_insert(D1I(s
)->buffered_messages
, item
);
672 return DTLS1_HM_FRAGMENT_RETRY
;
675 if (item
== NULL
&& frag
!= NULL
)
676 dtls1_hm_fragment_free(frag
);
683 dtls1_process_out_of_seq_message(SSL
*s
, struct hm_header_st
* msg_hdr
, int *ok
)
686 hm_fragment
*frag
= NULL
;
688 unsigned char seq64be
[8];
689 unsigned long frag_len
= msg_hdr
->frag_len
;
691 if ((msg_hdr
->frag_off
+ frag_len
) > msg_hdr
->msg_len
)
694 /* Try to find item in queue, to prevent duplicate entries */
695 memset(seq64be
, 0, sizeof(seq64be
));
696 seq64be
[6] = (unsigned char) (msg_hdr
->seq
>> 8);
697 seq64be
[7] = (unsigned char) msg_hdr
->seq
;
698 item
= pqueue_find(D1I(s
)->buffered_messages
, seq64be
);
701 * If we already have an entry and this one is a fragment,
702 * don't discard it and rather try to reassemble it.
704 if (item
!= NULL
&& frag_len
< msg_hdr
->msg_len
)
708 * Discard the message if sequence number was already there, is
709 * too far in the future, already in the queue or if we received
710 * a FINISHED before the SERVER_HELLO, which then must be a stale
713 if (msg_hdr
->seq
<= D1I(s
)->handshake_read_seq
||
714 msg_hdr
->seq
> D1I(s
)->handshake_read_seq
+ 10 || item
!= NULL
||
715 (D1I(s
)->handshake_read_seq
== 0 &&
716 msg_hdr
->type
== SSL3_MT_FINISHED
)) {
717 unsigned char devnull
[256];
720 i
= s
->method
->internal
->ssl_read_bytes(s
, SSL3_RT_HANDSHAKE
,
721 devnull
, frag_len
> sizeof(devnull
) ?
722 sizeof(devnull
) : frag_len
, 0);
728 if (frag_len
< msg_hdr
->msg_len
)
729 return dtls1_reassemble_fragment(s
, msg_hdr
, ok
);
731 if (frag_len
> dtls1_max_handshake_message_len(s
))
734 frag
= dtls1_hm_fragment_new(frag_len
, 0);
738 memcpy(&(frag
->msg_header
), msg_hdr
, sizeof(*msg_hdr
));
741 /* read the body of the fragment (header has already been read */
742 i
= s
->method
->internal
->ssl_read_bytes(s
, SSL3_RT_HANDSHAKE
,
743 frag
->fragment
, frag_len
, 0);
744 if (i
<= 0 || (unsigned long)i
!= frag_len
)
748 memset(seq64be
, 0, sizeof(seq64be
));
749 seq64be
[6] = (unsigned char)(msg_hdr
->seq
>> 8);
750 seq64be
[7] = (unsigned char)(msg_hdr
->seq
);
752 item
= pitem_new(seq64be
, frag
);
756 pqueue_insert(D1I(s
)->buffered_messages
, item
);
759 return DTLS1_HM_FRAGMENT_RETRY
;
762 if (item
== NULL
&& frag
!= NULL
)
763 dtls1_hm_fragment_free(frag
);
770 dtls1_get_message_fragment(SSL
*s
, int st1
, int stn
, long max
, int *ok
)
772 unsigned char wire
[DTLS1_HM_HEADER_LENGTH
];
773 unsigned long len
, frag_off
, frag_len
;
775 struct hm_header_st msg_hdr
;
778 /* see if we have the required fragment already */
779 if ((frag_len
= dtls1_retrieve_buffered_fragment(s
, max
, ok
)) || *ok
) {
781 s
->internal
->init_num
= frag_len
;
785 /* read handshake message header */
786 i
= s
->method
->internal
->ssl_read_bytes(s
, SSL3_RT_HANDSHAKE
, wire
,
787 DTLS1_HM_HEADER_LENGTH
, 0);
788 if (i
<= 0) /* nbio, or an error */
790 s
->internal
->rwstate
= SSL_READING
;
794 /* Handshake fails if message header is incomplete */
795 if (i
!= DTLS1_HM_HEADER_LENGTH
||
796 /* parse the message fragment header */
797 dtls1_get_message_header(wire
, &msg_hdr
) == 0) {
798 al
= SSL_AD_UNEXPECTED_MESSAGE
;
799 SSLerror(s
, SSL_R_UNEXPECTED_MESSAGE
);
804 * if this is a future (or stale) message it gets buffered
805 * (or dropped)--no further processing at this time
806 * While listening, we accept seq 1 (ClientHello with cookie)
807 * although we're still expecting seq 0 (ClientHello)
809 if (msg_hdr
.seq
!= D1I(s
)->handshake_read_seq
&&
810 !(D1I(s
)->listen
&& msg_hdr
.seq
== 1))
811 return dtls1_process_out_of_seq_message(s
, &msg_hdr
, ok
);
813 len
= msg_hdr
.msg_len
;
814 frag_off
= msg_hdr
.frag_off
;
815 frag_len
= msg_hdr
.frag_len
;
817 if (frag_len
&& frag_len
< len
)
818 return dtls1_reassemble_fragment(s
, &msg_hdr
, ok
);
820 if (!s
->server
&& D1I(s
)->r_msg_hdr
.frag_off
== 0 &&
821 wire
[0] == SSL3_MT_HELLO_REQUEST
) {
823 * The server may always send 'Hello Request' messages --
824 * we are doing a handshake anyway now, so ignore them
825 * if their format is correct. Does not count for
828 if (wire
[1] == 0 && wire
[2] == 0 && wire
[3] == 0) {
829 if (s
->internal
->msg_callback
)
830 s
->internal
->msg_callback(0, s
->version
,
831 SSL3_RT_HANDSHAKE
, wire
,
832 DTLS1_HM_HEADER_LENGTH
, s
,
833 s
->internal
->msg_callback_arg
);
835 s
->internal
->init_num
= 0;
838 else /* Incorrectly formated Hello request */
840 al
= SSL_AD_UNEXPECTED_MESSAGE
;
841 SSLerror(s
, SSL_R_UNEXPECTED_MESSAGE
);
846 if ((al
= dtls1_preprocess_fragment(s
, &msg_hdr
, max
)))
849 /* XDTLS: ressurect this when restart is in place */
850 S3I(s
)->hs
.state
= stn
;
853 unsigned char *p
= (unsigned char *)s
->internal
->init_buf
->data
+ DTLS1_HM_HEADER_LENGTH
;
855 i
= s
->method
->internal
->ssl_read_bytes(s
, SSL3_RT_HANDSHAKE
,
856 &p
[frag_off
], frag_len
, 0);
857 /* XDTLS: fix this--message fragments cannot span multiple packets */
859 s
->internal
->rwstate
= SSL_READING
;
867 * XDTLS: an incorrectly formatted fragment should cause the
870 if (i
!= (int)frag_len
) {
871 al
= SSL3_AD_ILLEGAL_PARAMETER
;
872 SSLerror(s
, SSL3_AD_ILLEGAL_PARAMETER
);
879 * Note that s->internal->init_num is *not* used as current offset in
880 * s->internal->init_buf->data, but as a counter summing up fragments'
881 * lengths: as soon as they sum up to handshake packet
882 * length, we assume we have got all the fragments.
884 s
->internal
->init_num
= frag_len
;
888 ssl3_send_alert(s
, SSL3_AL_FATAL
, al
);
889 s
->internal
->init_num
= 0;
896 dtls1_read_failed(SSL
*s
, int code
)
900 fprintf(stderr
, "invalid state reached %s:%d",
906 if (!dtls1_is_timer_expired(s
)) {
908 * not a timeout, none of our business, let higher layers
909 * handle this. in fact it's probably an error
914 if (!SSL_in_init(s
)) /* done, no need to send a retransmit */
916 BIO_set_flags(SSL_get_rbio(s
), BIO_FLAGS_READ
);
920 return dtls1_handle_timeout(s
);
924 dtls1_get_queue_priority(unsigned short seq
, int is_ccs
)
927 * The index of the retransmission queue actually is the message
928 * sequence number, since the queue only contains messages of a
929 * single handshake. However, the ChangeCipherSpec has no message
930 * sequence number and so using only the sequence will result in
931 * the CCS and Finished having the same index. To prevent this, the
932 * sequence number is multiplied by 2. In case of a CCS 1 is
933 * subtracted. This does not only differ CSS and Finished, it also
934 * maintains the order of the index (important for priority queues)
935 * and fits in the unsigned short variable.
937 return seq
* 2 - is_ccs
;
941 dtls1_retransmit_buffered_messages(SSL
*s
)
943 pqueue sent
= s
->d1
->sent_messages
;
949 iter
= pqueue_iterator(sent
);
951 for (item
= pqueue_next(&iter
); item
!= NULL
;
952 item
= pqueue_next(&iter
)) {
953 frag
= (hm_fragment
*)item
->data
;
954 if (dtls1_retransmit_message(s
,
955 (unsigned short)dtls1_get_queue_priority(
956 frag
->msg_header
.seq
, frag
->msg_header
.is_ccs
), 0,
957 &found
) <= 0 && found
) {
959 fprintf(stderr
, "dtls1_retransmit_message() failed\n");
969 dtls1_buffer_message(SSL
*s
, int is_ccs
)
973 unsigned char seq64be
[8];
975 /* Buffer the messsage in order to handle DTLS retransmissions. */
978 * This function is called immediately after a message has
981 OPENSSL_assert(s
->internal
->init_off
== 0);
983 frag
= dtls1_hm_fragment_new(s
->internal
->init_num
, 0);
987 memcpy(frag
->fragment
, s
->internal
->init_buf
->data
, s
->internal
->init_num
);
990 OPENSSL_assert(D1I(s
)->w_msg_hdr
.msg_len
+
991 ((s
->version
== DTLS1_VERSION
) ?
992 DTLS1_CCS_HEADER_LENGTH
: 3) == (unsigned int)s
->internal
->init_num
);
994 OPENSSL_assert(D1I(s
)->w_msg_hdr
.msg_len
+
995 DTLS1_HM_HEADER_LENGTH
== (unsigned int)s
->internal
->init_num
);
998 frag
->msg_header
.msg_len
= D1I(s
)->w_msg_hdr
.msg_len
;
999 frag
->msg_header
.seq
= D1I(s
)->w_msg_hdr
.seq
;
1000 frag
->msg_header
.type
= D1I(s
)->w_msg_hdr
.type
;
1001 frag
->msg_header
.frag_off
= 0;
1002 frag
->msg_header
.frag_len
= D1I(s
)->w_msg_hdr
.msg_len
;
1003 frag
->msg_header
.is_ccs
= is_ccs
;
1005 /* save current state*/
1006 frag
->msg_header
.saved_retransmit_state
.enc_write_ctx
= s
->internal
->enc_write_ctx
;
1007 frag
->msg_header
.saved_retransmit_state
.write_hash
= s
->internal
->write_hash
;
1008 frag
->msg_header
.saved_retransmit_state
.session
= s
->session
;
1009 frag
->msg_header
.saved_retransmit_state
.epoch
= D1I(s
)->w_epoch
;
1011 memset(seq64be
, 0, sizeof(seq64be
));
1012 seq64be
[6] = (unsigned char)(dtls1_get_queue_priority(
1013 frag
->msg_header
.seq
, frag
->msg_header
.is_ccs
) >> 8);
1014 seq64be
[7] = (unsigned char)(dtls1_get_queue_priority(
1015 frag
->msg_header
.seq
, frag
->msg_header
.is_ccs
));
1017 item
= pitem_new(seq64be
, frag
);
1019 dtls1_hm_fragment_free(frag
);
1023 pqueue_insert(s
->d1
->sent_messages
, item
);
1028 dtls1_retransmit_message(SSL
*s
, unsigned short seq
, unsigned long frag_off
,
1032 /* XDTLS: for now assuming that read/writes are blocking */
1035 unsigned long header_length
;
1036 unsigned char seq64be
[8];
1037 struct dtls1_retransmit_state saved_state
;
1038 unsigned char save_write_sequence
[8];
1041 OPENSSL_assert(s->internal->init_num == 0);
1042 OPENSSL_assert(s->internal->init_off == 0);
1045 /* XDTLS: the requested message ought to be found, otherwise error */
1046 memset(seq64be
, 0, sizeof(seq64be
));
1047 seq64be
[6] = (unsigned char)(seq
>> 8);
1048 seq64be
[7] = (unsigned char)seq
;
1050 item
= pqueue_find(s
->d1
->sent_messages
, seq64be
);
1053 fprintf(stderr
, "retransmit: message %d non-existant\n", seq
);
1060 frag
= (hm_fragment
*)item
->data
;
1062 if (frag
->msg_header
.is_ccs
)
1063 header_length
= DTLS1_CCS_HEADER_LENGTH
;
1065 header_length
= DTLS1_HM_HEADER_LENGTH
;
1067 memcpy(s
->internal
->init_buf
->data
, frag
->fragment
,
1068 frag
->msg_header
.msg_len
+ header_length
);
1069 s
->internal
->init_num
= frag
->msg_header
.msg_len
+ header_length
;
1071 dtls1_set_message_header_int(s
, frag
->msg_header
.type
,
1072 frag
->msg_header
.msg_len
, frag
->msg_header
.seq
, 0,
1073 frag
->msg_header
.frag_len
);
1075 /* save current state */
1076 saved_state
.enc_write_ctx
= s
->internal
->enc_write_ctx
;
1077 saved_state
.write_hash
= s
->internal
->write_hash
;
1078 saved_state
.session
= s
->session
;
1079 saved_state
.epoch
= D1I(s
)->w_epoch
;
1081 D1I(s
)->retransmitting
= 1;
1083 /* restore state in which the message was originally sent */
1084 s
->internal
->enc_write_ctx
= frag
->msg_header
.saved_retransmit_state
.enc_write_ctx
;
1085 s
->internal
->write_hash
= frag
->msg_header
.saved_retransmit_state
.write_hash
;
1086 s
->session
= frag
->msg_header
.saved_retransmit_state
.session
;
1087 D1I(s
)->w_epoch
= frag
->msg_header
.saved_retransmit_state
.epoch
;
1089 if (frag
->msg_header
.saved_retransmit_state
.epoch
==
1090 saved_state
.epoch
- 1) {
1091 memcpy(save_write_sequence
, S3I(s
)->write_sequence
,
1092 sizeof(S3I(s
)->write_sequence
));
1093 memcpy(S3I(s
)->write_sequence
, D1I(s
)->last_write_sequence
,
1094 sizeof(S3I(s
)->write_sequence
));
1097 ret
= dtls1_do_write(s
, frag
->msg_header
.is_ccs
?
1098 SSL3_RT_CHANGE_CIPHER_SPEC
: SSL3_RT_HANDSHAKE
);
1100 /* restore current state */
1101 s
->internal
->enc_write_ctx
= saved_state
.enc_write_ctx
;
1102 s
->internal
->write_hash
= saved_state
.write_hash
;
1103 s
->session
= saved_state
.session
;
1104 D1I(s
)->w_epoch
= saved_state
.epoch
;
1106 if (frag
->msg_header
.saved_retransmit_state
.epoch
==
1107 saved_state
.epoch
- 1) {
1108 memcpy(D1I(s
)->last_write_sequence
, S3I(s
)->write_sequence
,
1109 sizeof(S3I(s
)->write_sequence
));
1110 memcpy(S3I(s
)->write_sequence
, save_write_sequence
,
1111 sizeof(S3I(s
)->write_sequence
));
1114 D1I(s
)->retransmitting
= 0;
1116 (void)BIO_flush(SSL_get_wbio(s
));
1120 /* call this function when the buffered messages are no longer needed */
1122 dtls1_clear_record_buffer(SSL
*s
)
1126 for(item
= pqueue_pop(s
->d1
->sent_messages
); item
!= NULL
;
1127 item
= pqueue_pop(s
->d1
->sent_messages
)) {
1128 dtls1_hm_fragment_free((hm_fragment
*)item
->data
);
1134 dtls1_set_message_header(SSL
*s
, unsigned char mt
, unsigned long len
,
1135 unsigned long frag_off
, unsigned long frag_len
)
1137 /* Don't change sequence numbers while listening */
1138 if (frag_off
== 0 && !D1I(s
)->listen
) {
1139 D1I(s
)->handshake_write_seq
= D1I(s
)->next_handshake_write_seq
;
1140 D1I(s
)->next_handshake_write_seq
++;
1143 dtls1_set_message_header_int(s
, mt
, len
, D1I(s
)->handshake_write_seq
,
1144 frag_off
, frag_len
);
1147 /* don't actually do the writing, wait till the MTU has been retrieved */
1149 dtls1_set_message_header_int(SSL
*s
, unsigned char mt
, unsigned long len
,
1150 unsigned short seq_num
, unsigned long frag_off
, unsigned long frag_len
)
1152 struct hm_header_st
*msg_hdr
= &D1I(s
)->w_msg_hdr
;
1155 msg_hdr
->msg_len
= len
;
1156 msg_hdr
->seq
= seq_num
;
1157 msg_hdr
->frag_off
= frag_off
;
1158 msg_hdr
->frag_len
= frag_len
;
1162 dtls1_fix_message_header(SSL
*s
, unsigned long frag_off
, unsigned long frag_len
)
1164 struct hm_header_st
*msg_hdr
= &D1I(s
)->w_msg_hdr
;
1166 msg_hdr
->frag_off
= frag_off
;
1167 msg_hdr
->frag_len
= frag_len
;
1170 static unsigned char *
1171 dtls1_write_message_header(SSL
*s
, unsigned char *p
)
1173 struct hm_header_st
*msg_hdr
= &D1I(s
)->w_msg_hdr
;
1175 *p
++ = msg_hdr
->type
;
1176 l2n3(msg_hdr
->msg_len
, p
);
1178 s2n(msg_hdr
->seq
, p
);
1179 l2n3(msg_hdr
->frag_off
, p
);
1180 l2n3(msg_hdr
->frag_len
, p
);
1188 return (g_probable_mtu
[(sizeof(g_probable_mtu
) /
1189 sizeof(g_probable_mtu
[0])) - 1]);
1193 dtls1_guess_mtu(unsigned int curr_mtu
)
1198 return g_probable_mtu
[0];
1200 for (i
= 0; i
< sizeof(g_probable_mtu
) / sizeof(g_probable_mtu
[0]); i
++)
1201 if (curr_mtu
> g_probable_mtu
[i
])
1202 return g_probable_mtu
[i
];
1208 dtls1_get_message_header(unsigned char *data
, struct hm_header_st
*msg_hdr
)
1211 uint32_t msg_len
, frag_off
, frag_len
;
1215 CBS_init(&header
, data
, sizeof(*msg_hdr
));
1217 memset(msg_hdr
, 0, sizeof(*msg_hdr
));
1219 if (!CBS_get_u8(&header
, &type
))
1221 if (!CBS_get_u24(&header
, &msg_len
))
1223 if (!CBS_get_u16(&header
, &seq
))
1225 if (!CBS_get_u24(&header
, &frag_off
))
1227 if (!CBS_get_u24(&header
, &frag_len
))
1230 msg_hdr
->type
= type
;
1231 msg_hdr
->msg_len
= msg_len
;
1233 msg_hdr
->frag_off
= frag_off
;
1234 msg_hdr
->frag_len
= frag_len
;
1240 dtls1_get_ccs_header(unsigned char *data
, struct ccs_header_st
*ccs_hdr
)
1242 memset(ccs_hdr
, 0x00, sizeof(struct ccs_header_st
));
1244 ccs_hdr
->type
= *(data
++);
1248 dtls1_shutdown(SSL
*s
)
1252 ret
= ssl3_shutdown(s
);