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.]
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>
126 #define RSMBLY_BITMASK_SIZE(msg_len) (((msg_len) + 7) / 8)
128 #define RSMBLY_BITMASK_MARK(bitmask, start, end) { \
129 if ((end) - (start) <= 8) { \
131 for (ii = (start); ii < (end); ii++) bitmask[((ii) >> 3)] |= (1 << ((ii) & 7)); \
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)]; \
139 #define RSMBLY_BITMASK_IS_COMPLETE(bitmask, msg_len, is_complete) { \
141 OPENSSL_assert((msg_len) > 0); \
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; } }
148 #define RSMBLY_BITMASK_PRINT(bitmask, msg_len) { \
150 printf("bitmask: "); for (ii = 0; ii < (msg_len); ii++) \
151 printf("%d ", (bitmask[ii >> 3] & (1 << (ii & 7))) >> (ii & 7)); \
155 static unsigned char bitmask_start_values
[] = {0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80};
156 static unsigned char bitmask_end_values
[] = {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
,
166 static void dtls1_set_message_header_int(SSL
*s
, unsigned char mt
,
167 unsigned long len
, unsigned short seq_num
, unsigned long frag_off
,
168 unsigned long frag_len
);
169 static long dtls1_get_message_fragment(SSL
*s
, int st1
, int stn
,
173 dtls1_hm_fragment_new(unsigned long frag_len
, int reassembly
)
175 hm_fragment
*frag
= NULL
;
176 unsigned char *buf
= NULL
;
177 unsigned char *bitmask
= NULL
;
179 frag
= (hm_fragment
*)OPENSSL_malloc(sizeof(hm_fragment
));
185 buf
= (unsigned char *)OPENSSL_malloc(frag_len
);
193 /* zero length fragment gets zero frag->fragment */
194 frag
->fragment
= buf
;
196 /* Initialize reassembly bitmask if necessary */
199 bitmask
= (unsigned char *)OPENSSL_malloc(RSMBLY_BITMASK_SIZE(frag_len
));
202 if (buf
!= NULL
) OPENSSL_free(buf
);
206 memset(bitmask
, 0, RSMBLY_BITMASK_SIZE(frag_len
));
209 frag
->reassembly
= bitmask
;
215 dtls1_hm_fragment_free(hm_fragment
*frag
)
218 if (frag
->msg_header
.is_ccs
)
220 EVP_CIPHER_CTX_free(frag
->msg_header
.saved_retransmit_state
.enc_write_ctx
);
221 EVP_MD_CTX_destroy(frag
->msg_header
.saved_retransmit_state
.write_hash
);
223 if (frag
->fragment
) OPENSSL_free(frag
->fragment
);
224 if (frag
->reassembly
) OPENSSL_free(frag
->reassembly
);
228 /* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */
229 int dtls1_do_write(SSL
*s
, int type
)
233 unsigned int len
, frag_off
, mac_size
, blocksize
;
235 /* AHA! Figure out the MTU, and stick to the right size */
236 if (s
->d1
->mtu
< dtls1_min_mtu() && !(SSL_get_options(s
) & SSL_OP_NO_QUERY_MTU
))
239 BIO_ctrl(SSL_get_wbio(s
), BIO_CTRL_DGRAM_QUERY_MTU
, 0, NULL
);
241 /* I've seen the kernel return bogus numbers when it doesn't know
242 * (initial write), so just make sure we have a reasonable number */
243 if (s
->d1
->mtu
< dtls1_min_mtu())
246 s
->d1
->mtu
= dtls1_guess_mtu(s
->d1
->mtu
);
247 BIO_ctrl(SSL_get_wbio(s
), BIO_CTRL_DGRAM_SET_MTU
,
254 fprintf(stderr
, "using MTU = %d\n", mtu
);
256 mtu
-= (DTLS1_HM_HEADER_LENGTH
+ DTLS1_RT_HEADER_LENGTH
);
258 curr_mtu
= mtu
- BIO_wpending(SSL_get_wbio(s
));
262 else if ( ( ret
= BIO_flush(SSL_get_wbio(s
))) <= 0)
265 if ( BIO_wpending(SSL_get_wbio(s
)) + s
->init_num
>= mtu
)
267 ret
= BIO_flush(SSL_get_wbio(s
));
270 mtu
= s
->d1
->mtu
- (DTLS1_HM_HEADER_LENGTH
+ DTLS1_RT_HEADER_LENGTH
);
274 OPENSSL_assert(s
->d1
->mtu
>= dtls1_min_mtu()); /* should have something reasonable now */
276 if ( s
->init_off
== 0 && type
== SSL3_RT_HANDSHAKE
)
277 OPENSSL_assert(s
->init_num
==
278 (int)s
->d1
->w_msg_hdr
.msg_len
+ DTLS1_HM_HEADER_LENGTH
);
281 mac_size
= EVP_MD_CTX_size(s
->write_hash
);
285 if (s
->enc_write_ctx
&&
286 (EVP_CIPHER_mode( s
->enc_write_ctx
->cipher
) & EVP_CIPH_CBC_MODE
))
287 blocksize
= 2 * EVP_CIPHER_block_size(s
->enc_write_ctx
->cipher
);
294 curr_mtu
= s
->d1
->mtu
- BIO_wpending(SSL_get_wbio(s
)) -
295 DTLS1_RT_HEADER_LENGTH
- mac_size
- blocksize
;
297 if ( curr_mtu
<= DTLS1_HM_HEADER_LENGTH
)
299 /* grr.. we could get an error if MTU picked was wrong */
300 ret
= BIO_flush(SSL_get_wbio(s
));
303 curr_mtu
= s
->d1
->mtu
- DTLS1_RT_HEADER_LENGTH
-
304 mac_size
- blocksize
;
307 if ( s
->init_num
> curr_mtu
)
313 /* XDTLS: this function is too long. split out the CCS part */
314 if ( type
== SSL3_RT_HANDSHAKE
)
316 if ( s
->init_off
!= 0)
318 OPENSSL_assert(s
->init_off
> DTLS1_HM_HEADER_LENGTH
);
319 s
->init_off
-= DTLS1_HM_HEADER_LENGTH
;
320 s
->init_num
+= DTLS1_HM_HEADER_LENGTH
;
322 if ( s
->init_num
> curr_mtu
)
328 dtls1_fix_message_header(s
, frag_off
,
329 len
- DTLS1_HM_HEADER_LENGTH
);
331 dtls1_write_message_header(s
, (unsigned char *)&s
->init_buf
->data
[s
->init_off
]);
333 OPENSSL_assert(len
>= DTLS1_HM_HEADER_LENGTH
);
336 ret
=dtls1_write_bytes(s
,type
,&s
->init_buf
->data
[s
->init_off
],
340 /* might need to update MTU here, but we don't know
341 * which previous packet caused the failure -- so can't
342 * really retransmit anything. continue as if everything
343 * is fine and wait for an alert to handle the
346 if ( BIO_ctrl(SSL_get_wbio(s
),
347 BIO_CTRL_DGRAM_MTU_EXCEEDED
, 0, NULL
) > 0 )
348 s
->d1
->mtu
= BIO_ctrl(SSL_get_wbio(s
),
349 BIO_CTRL_DGRAM_QUERY_MTU
, 0, NULL
);
356 /* bad if this assert fails, only part of the handshake
357 * message got sent. but why would this happen? */
358 OPENSSL_assert(len
== (unsigned int)ret
);
360 if (type
== SSL3_RT_HANDSHAKE
&& ! s
->d1
->retransmitting
)
362 /* should not be done for 'Hello Request's, but in that case
363 * we'll ignore the result anyway */
364 unsigned char *p
= (unsigned char *)&s
->init_buf
->data
[s
->init_off
];
365 const struct hm_header_st
*msg_hdr
= &s
->d1
->w_msg_hdr
;
368 if (frag_off
== 0 && s
->version
!= DTLS1_BAD_VER
)
370 /* reconstruct message header is if it
371 * is being sent in single fragment */
372 *p
++ = msg_hdr
->type
;
373 l2n3(msg_hdr
->msg_len
,p
);
374 s2n (msg_hdr
->seq
,p
);
376 l2n3(msg_hdr
->msg_len
,p
);
377 p
-= DTLS1_HM_HEADER_LENGTH
;
382 p
+= DTLS1_HM_HEADER_LENGTH
;
383 xlen
= ret
- DTLS1_HM_HEADER_LENGTH
;
386 ssl3_finish_mac(s
, p
, xlen
);
389 if (ret
== s
->init_num
)
392 s
->msg_callback(1, s
->version
, type
, s
->init_buf
->data
,
393 (size_t)(s
->init_off
+ s
->init_num
), s
,
394 s
->msg_callback_arg
);
396 s
->init_off
= 0; /* done writing this message */
403 frag_off
+= (ret
-= DTLS1_HM_HEADER_LENGTH
);
410 /* Obtain handshake message of message type 'mt' (any if mt == -1),
411 * maximum acceptable body length 'max'.
412 * Read an entire handshake message. Handshake messages arrive in
415 long dtls1_get_message(SSL
*s
, int st1
, int stn
, int mt
, long max
, int *ok
)
418 struct hm_header_st
*msg_hdr
;
420 unsigned long msg_len
;
422 /* s3->tmp is used to store messages that are unexpected, caused
423 * by the absence of an optional handshake message */
424 if (s
->s3
->tmp
.reuse_message
)
426 s
->s3
->tmp
.reuse_message
=0;
427 if ((mt
>= 0) && (s
->s3
->tmp
.message_type
!= mt
))
429 al
=SSL_AD_UNEXPECTED_MESSAGE
;
430 SSLerr(SSL_F_DTLS1_GET_MESSAGE
,SSL_R_UNEXPECTED_MESSAGE
);
434 s
->init_msg
= s
->init_buf
->data
+ DTLS1_HM_HEADER_LENGTH
;
435 s
->init_num
= (int)s
->s3
->tmp
.message_size
;
439 msg_hdr
= &s
->d1
->r_msg_hdr
;
440 memset(msg_hdr
, 0x00, sizeof(struct hm_header_st
));
443 i
= dtls1_get_message_fragment(s
, st1
, stn
, max
, ok
);
444 if ( i
== DTLS1_HM_BAD_FRAGMENT
||
445 i
== DTLS1_HM_FRAGMENT_RETRY
) /* bad fragment received */
447 else if ( i
<= 0 && !*ok
)
450 p
= (unsigned char *)s
->init_buf
->data
;
451 msg_len
= msg_hdr
->msg_len
;
453 /* reconstruct message header */
454 *(p
++) = msg_hdr
->type
;
456 s2n (msg_hdr
->seq
,p
);
459 if (s
->version
!= DTLS1_BAD_VER
) {
460 p
-= DTLS1_HM_HEADER_LENGTH
;
461 msg_len
+= DTLS1_HM_HEADER_LENGTH
;
464 ssl3_finish_mac(s
, p
, msg_len
);
466 s
->msg_callback(0, s
->version
, SSL3_RT_HANDSHAKE
,
468 s
, s
->msg_callback_arg
);
470 memset(msg_hdr
, 0x00, sizeof(struct hm_header_st
));
472 /* Don't change sequence numbers while listening */
474 s
->d1
->handshake_read_seq
++;
476 s
->init_msg
= s
->init_buf
->data
+ DTLS1_HM_HEADER_LENGTH
;
480 ssl3_send_alert(s
,SSL3_AL_FATAL
,al
);
486 static int dtls1_preprocess_fragment(SSL
*s
,struct hm_header_st
*msg_hdr
,int max
)
488 size_t frag_off
,frag_len
,msg_len
;
490 msg_len
= msg_hdr
->msg_len
;
491 frag_off
= msg_hdr
->frag_off
;
492 frag_len
= msg_hdr
->frag_len
;
494 /* sanity checking */
495 if ( (frag_off
+frag_len
) > msg_len
)
497 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT
,SSL_R_EXCESSIVE_MESSAGE_SIZE
);
498 return SSL_AD_ILLEGAL_PARAMETER
;
501 if ( (frag_off
+frag_len
) > (unsigned long)max
)
503 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT
,SSL_R_EXCESSIVE_MESSAGE_SIZE
);
504 return SSL_AD_ILLEGAL_PARAMETER
;
507 if ( s
->d1
->r_msg_hdr
.frag_off
== 0) /* first fragment */
509 /* msg_len is limited to 2^24, but is effectively checked
510 * against max above */
511 if (!BUF_MEM_grow_clean(s
->init_buf
,msg_len
+DTLS1_HM_HEADER_LENGTH
))
513 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT
,ERR_R_BUF_LIB
);
514 return SSL_AD_INTERNAL_ERROR
;
517 s
->s3
->tmp
.message_size
= msg_len
;
518 s
->d1
->r_msg_hdr
.msg_len
= msg_len
;
519 s
->s3
->tmp
.message_type
= msg_hdr
->type
;
520 s
->d1
->r_msg_hdr
.type
= msg_hdr
->type
;
521 s
->d1
->r_msg_hdr
.seq
= msg_hdr
->seq
;
523 else if (msg_len
!= s
->d1
->r_msg_hdr
.msg_len
)
525 /* They must be playing with us! BTW, failure to enforce
526 * upper limit would open possibility for buffer overrun. */
527 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT
,SSL_R_EXCESSIVE_MESSAGE_SIZE
);
528 return SSL_AD_ILLEGAL_PARAMETER
;
531 return 0; /* no error */
536 dtls1_retrieve_buffered_fragment(SSL
*s
, long max
, int *ok
)
538 /* (0) check whether the desired fragment is available
540 * (1) copy over the fragment to s->init_buf->data[]
541 * (2) update s->init_num
548 item
= pqueue_peek(s
->d1
->buffered_messages
);
552 frag
= (hm_fragment
*)item
->data
;
554 /* Don't return if reassembly still in progress */
555 if (frag
->reassembly
!= NULL
)
558 if ( s
->d1
->handshake_read_seq
== frag
->msg_header
.seq
)
560 unsigned long frag_len
= frag
->msg_header
.frag_len
;
561 pqueue_pop(s
->d1
->buffered_messages
);
563 al
=dtls1_preprocess_fragment(s
,&frag
->msg_header
,max
);
565 if (al
==0) /* no alert */
567 unsigned char *p
= (unsigned char *)s
->init_buf
->data
+DTLS1_HM_HEADER_LENGTH
;
568 memcpy(&p
[frag
->msg_header
.frag_off
],
569 frag
->fragment
,frag
->msg_header
.frag_len
);
572 dtls1_hm_fragment_free(frag
);
581 ssl3_send_alert(s
,SSL3_AL_FATAL
,al
);
590 /* dtls1_max_handshake_message_len returns the maximum number of bytes
591 * permitted in a DTLS handshake message for |s|. The minimum is 16KB, but may
592 * be greater if the maximum certificate list size requires it. */
593 static unsigned long dtls1_max_handshake_message_len(const SSL
*s
)
595 unsigned long max_len
= DTLS1_HM_HEADER_LENGTH
+ SSL3_RT_MAX_ENCRYPTED_LENGTH
;
596 if (max_len
< (unsigned long)s
->max_cert_list
)
597 return s
->max_cert_list
;
602 dtls1_reassemble_fragment(SSL
*s
, struct hm_header_st
* msg_hdr
, int *ok
)
604 hm_fragment
*frag
= NULL
;
606 int i
= -1, is_complete
;
607 unsigned char seq64be
[8];
608 unsigned long frag_len
= msg_hdr
->frag_len
;
610 if ((msg_hdr
->frag_off
+frag_len
) > msg_hdr
->msg_len
||
611 msg_hdr
->msg_len
> dtls1_max_handshake_message_len(s
))
615 return DTLS1_HM_FRAGMENT_RETRY
;
617 /* Try to find item in queue */
618 memset(seq64be
,0,sizeof(seq64be
));
619 seq64be
[6] = (unsigned char) (msg_hdr
->seq
>>8);
620 seq64be
[7] = (unsigned char) msg_hdr
->seq
;
621 item
= pqueue_find(s
->d1
->buffered_messages
, seq64be
);
625 frag
= dtls1_hm_fragment_new(msg_hdr
->msg_len
, 1);
628 memcpy(&(frag
->msg_header
), msg_hdr
, sizeof(*msg_hdr
));
629 frag
->msg_header
.frag_len
= frag
->msg_header
.msg_len
;
630 frag
->msg_header
.frag_off
= 0;
634 frag
= (hm_fragment
*) item
->data
;
635 if (frag
->msg_header
.msg_len
!= msg_hdr
->msg_len
)
644 /* If message is already reassembled, this must be a
645 * retransmit and can be dropped. In this case item != NULL and so frag
646 * does not need to be freed.
648 if (frag
->reassembly
== NULL
)
650 unsigned char devnull
[256];
654 i
= s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,
656 frag_len
>sizeof(devnull
)?sizeof(devnull
):frag_len
,0);
660 return DTLS1_HM_FRAGMENT_RETRY
;
663 /* read the body of the fragment (header has already been read */
664 i
= s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,
665 frag
->fragment
+ msg_hdr
->frag_off
,frag_len
,0);
666 if ((unsigned long)i
!=frag_len
)
671 RSMBLY_BITMASK_MARK(frag
->reassembly
, (long)msg_hdr
->frag_off
,
672 (long)(msg_hdr
->frag_off
+ frag_len
));
674 RSMBLY_BITMASK_IS_COMPLETE(frag
->reassembly
, (long)msg_hdr
->msg_len
,
679 OPENSSL_free(frag
->reassembly
);
680 frag
->reassembly
= NULL
;
685 memset(seq64be
,0,sizeof(seq64be
));
686 seq64be
[6] = (unsigned char)(msg_hdr
->seq
>>8);
687 seq64be
[7] = (unsigned char)(msg_hdr
->seq
);
689 item
= pitem_new(seq64be
, frag
);
696 item
= pqueue_insert(s
->d1
->buffered_messages
, item
);
697 /* pqueue_insert fails iff a duplicate item is inserted.
698 * However, |item| cannot be a duplicate. If it were,
699 * |pqueue_find|, above, would have returned it and control
700 * would never have reached this branch. */
701 OPENSSL_assert(item
!= NULL
);
704 return DTLS1_HM_FRAGMENT_RETRY
;
707 if (frag
!= NULL
&& item
== NULL
) dtls1_hm_fragment_free(frag
);
714 dtls1_process_out_of_seq_message(SSL
*s
, struct hm_header_st
* msg_hdr
, int *ok
)
717 hm_fragment
*frag
= NULL
;
719 unsigned char seq64be
[8];
720 unsigned long frag_len
= msg_hdr
->frag_len
;
722 if ((msg_hdr
->frag_off
+frag_len
) > msg_hdr
->msg_len
)
725 /* Try to find item in queue, to prevent duplicate entries */
726 memset(seq64be
,0,sizeof(seq64be
));
727 seq64be
[6] = (unsigned char) (msg_hdr
->seq
>>8);
728 seq64be
[7] = (unsigned char) msg_hdr
->seq
;
729 item
= pqueue_find(s
->d1
->buffered_messages
, seq64be
);
731 /* If we already have an entry and this one is a fragment,
732 * don't discard it and rather try to reassemble it.
734 if (item
!= NULL
&& frag_len
< msg_hdr
->msg_len
)
737 /* Discard the message if sequence number was already there, is
738 * too far in the future, already in the queue or if we received
739 * a FINISHED before the SERVER_HELLO, which then must be a stale
742 if (msg_hdr
->seq
<= s
->d1
->handshake_read_seq
||
743 msg_hdr
->seq
> s
->d1
->handshake_read_seq
+ 10 || item
!= NULL
||
744 (s
->d1
->handshake_read_seq
== 0 && msg_hdr
->type
== SSL3_MT_FINISHED
))
746 unsigned char devnull
[256];
750 i
= s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,
752 frag_len
>sizeof(devnull
)?sizeof(devnull
):frag_len
,0);
759 if (frag_len
< msg_hdr
->msg_len
)
760 return dtls1_reassemble_fragment(s
, msg_hdr
, ok
);
762 if (frag_len
> dtls1_max_handshake_message_len(s
))
765 frag
= dtls1_hm_fragment_new(frag_len
, 0);
769 memcpy(&(frag
->msg_header
), msg_hdr
, sizeof(*msg_hdr
));
773 /* read the body of the fragment (header has already been read */
774 i
= s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,
775 frag
->fragment
,frag_len
,0);
776 if ((unsigned long)i
!=frag_len
)
782 memset(seq64be
,0,sizeof(seq64be
));
783 seq64be
[6] = (unsigned char)(msg_hdr
->seq
>>8);
784 seq64be
[7] = (unsigned char)(msg_hdr
->seq
);
786 item
= pitem_new(seq64be
, frag
);
790 item
= pqueue_insert(s
->d1
->buffered_messages
, item
);
791 /* pqueue_insert fails iff a duplicate item is inserted.
792 * However, |item| cannot be a duplicate. If it were,
793 * |pqueue_find|, above, would have returned it. Then, either
794 * |frag_len| != |msg_hdr->msg_len| in which case |item| is set
795 * to NULL and it will have been processed with
796 * |dtls1_reassemble_fragment|, above, or the record will have
798 OPENSSL_assert(item
!= NULL
);
801 return DTLS1_HM_FRAGMENT_RETRY
;
804 if (frag
!= NULL
&& item
== NULL
) dtls1_hm_fragment_free(frag
);
811 dtls1_get_message_fragment(SSL
*s
, int st1
, int stn
, long max
, int *ok
)
813 unsigned char wire
[DTLS1_HM_HEADER_LENGTH
];
814 unsigned long len
, frag_off
, frag_len
;
816 struct hm_header_st msg_hdr
;
819 /* see if we have the required fragment already */
820 if ((frag_len
= dtls1_retrieve_buffered_fragment(s
,max
,ok
)) || *ok
)
822 if (*ok
) s
->init_num
= frag_len
;
826 /* read handshake message header */
827 i
=s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,wire
,
828 DTLS1_HM_HEADER_LENGTH
, 0);
829 if (i
<= 0) /* nbio, or an error */
831 s
->rwstate
=SSL_READING
;
835 /* Handshake fails if message header is incomplete */
836 if (i
!= DTLS1_HM_HEADER_LENGTH
)
838 al
=SSL_AD_UNEXPECTED_MESSAGE
;
839 SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT
,SSL_R_UNEXPECTED_MESSAGE
);
843 /* parse the message fragment header */
844 dtls1_get_message_header(wire
, &msg_hdr
);
847 * if this is a future (or stale) message it gets buffered
848 * (or dropped)--no further processing at this time
849 * While listening, we accept seq 1 (ClientHello with cookie)
850 * although we're still expecting seq 0 (ClientHello)
852 if (msg_hdr
.seq
!= s
->d1
->handshake_read_seq
&& !(s
->d1
->listen
&& msg_hdr
.seq
== 1))
853 return dtls1_process_out_of_seq_message(s
, &msg_hdr
, ok
);
855 len
= msg_hdr
.msg_len
;
856 frag_off
= msg_hdr
.frag_off
;
857 frag_len
= msg_hdr
.frag_len
;
859 if (frag_len
&& frag_len
< len
)
860 return dtls1_reassemble_fragment(s
, &msg_hdr
, ok
);
862 if (!s
->server
&& s
->d1
->r_msg_hdr
.frag_off
== 0 &&
863 wire
[0] == SSL3_MT_HELLO_REQUEST
)
865 /* The server may always send 'Hello Request' messages --
866 * we are doing a handshake anyway now, so ignore them
867 * if their format is correct. Does not count for
869 if (wire
[1] == 0 && wire
[2] == 0 && wire
[3] == 0)
872 s
->msg_callback(0, s
->version
, SSL3_RT_HANDSHAKE
,
873 wire
, DTLS1_HM_HEADER_LENGTH
, s
,
874 s
->msg_callback_arg
);
879 else /* Incorrectly formated Hello request */
881 al
=SSL_AD_UNEXPECTED_MESSAGE
;
882 SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT
,SSL_R_UNEXPECTED_MESSAGE
);
887 if ((al
=dtls1_preprocess_fragment(s
,&msg_hdr
,max
)))
890 /* XDTLS: ressurect this when restart is in place */
895 unsigned char *p
=(unsigned char *)s
->init_buf
->data
+DTLS1_HM_HEADER_LENGTH
;
897 i
=s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,
898 &p
[frag_off
],frag_len
,0);
899 /* XDTLS: fix this--message fragments cannot span multiple packets */
902 s
->rwstate
=SSL_READING
;
910 /* XDTLS: an incorrectly formatted fragment should cause the
911 * handshake to fail */
912 if (i
!= (int)frag_len
)
914 al
=SSL3_AD_ILLEGAL_PARAMETER
;
915 SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT
,SSL3_AD_ILLEGAL_PARAMETER
);
921 /* Note that s->init_num is *not* used as current offset in
922 * s->init_buf->data, but as a counter summing up fragments'
923 * lengths: as soon as they sum up to handshake packet
924 * length, we assume we have got all the fragments. */
925 s
->init_num
= frag_len
;
929 ssl3_send_alert(s
,SSL3_AL_FATAL
,al
);
936 int dtls1_send_finished(SSL
*s
, int a
, int b
, const char *sender
, int slen
)
944 d
=(unsigned char *)s
->init_buf
->data
;
945 p
= &(d
[DTLS1_HM_HEADER_LENGTH
]);
947 i
=s
->method
->ssl3_enc
->final_finish_mac(s
,
948 sender
,slen
,s
->s3
->tmp
.finish_md
);
949 s
->s3
->tmp
.finish_md_len
= i
;
950 memcpy(p
, s
->s3
->tmp
.finish_md
, i
);
954 /* Copy the finished so we can use it for
955 * renegotiation checks
957 if(s
->type
== SSL_ST_CONNECT
)
959 OPENSSL_assert(i
<= EVP_MAX_MD_SIZE
);
960 memcpy(s
->s3
->previous_client_finished
,
961 s
->s3
->tmp
.finish_md
, i
);
962 s
->s3
->previous_client_finished_len
=i
;
966 OPENSSL_assert(i
<= EVP_MAX_MD_SIZE
);
967 memcpy(s
->s3
->previous_server_finished
,
968 s
->s3
->tmp
.finish_md
, i
);
969 s
->s3
->previous_server_finished_len
=i
;
972 #ifdef OPENSSL_SYS_WIN16
973 /* MSVC 1.5 does not clear the top bytes of the word unless
979 d
= dtls1_set_message_header(s
, d
, SSL3_MT_FINISHED
, l
, 0, l
);
980 s
->init_num
=(int)l
+DTLS1_HM_HEADER_LENGTH
;
983 /* buffer the message to handle re-xmits */
984 dtls1_buffer_message(s
, 0);
989 /* SSL3_ST_SEND_xxxxxx_HELLO_B */
990 return(dtls1_do_write(s
,SSL3_RT_HANDSHAKE
));
993 /* for these 2 messages, we need to
994 * ssl->enc_read_ctx re-init
995 * ssl->s3->read_sequence zero
996 * ssl->s3->read_mac_secret re-init
997 * ssl->session->read_sym_enc assign
998 * ssl->session->read_compression assign
999 * ssl->session->read_hash assign
1001 int dtls1_send_change_cipher_spec(SSL
*s
, int a
, int b
)
1007 p
=(unsigned char *)s
->init_buf
->data
;
1009 s
->d1
->handshake_write_seq
= s
->d1
->next_handshake_write_seq
;
1010 s
->init_num
=DTLS1_CCS_HEADER_LENGTH
;
1012 if (s
->version
== DTLS1_BAD_VER
) {
1013 s
->d1
->next_handshake_write_seq
++;
1014 s2n(s
->d1
->handshake_write_seq
,p
);
1020 dtls1_set_message_header_int(s
, SSL3_MT_CCS
, 0,
1021 s
->d1
->handshake_write_seq
, 0, 0);
1023 /* buffer the message to handle re-xmits */
1024 dtls1_buffer_message(s
, 1);
1029 /* SSL3_ST_CW_CHANGE_B */
1030 return(dtls1_do_write(s
,SSL3_RT_CHANGE_CIPHER_SPEC
));
1033 static int dtls1_add_cert_to_buf(BUF_MEM
*buf
, unsigned long *l
, X509
*x
)
1039 if (!BUF_MEM_grow_clean(buf
,(int)(n
+(*l
)+3)))
1041 SSLerr(SSL_F_DTLS1_ADD_CERT_TO_BUF
,ERR_R_BUF_LIB
);
1044 p
=(unsigned char *)&(buf
->data
[*l
]);
1051 unsigned long dtls1_output_cert_chain(SSL
*s
, X509
*x
)
1055 unsigned long l
= 3 + DTLS1_HM_HEADER_LENGTH
;
1058 /* TLSv1 sends a chain with nothing in it, instead of an alert */
1060 if (!BUF_MEM_grow_clean(buf
,10))
1062 SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN
,ERR_R_BUF_LIB
);
1067 X509_STORE_CTX xs_ctx
;
1069 if (!X509_STORE_CTX_init(&xs_ctx
,s
->ctx
->cert_store
,x
,NULL
))
1071 SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN
,ERR_R_X509_LIB
);
1075 X509_verify_cert(&xs_ctx
);
1076 /* Don't leave errors in the queue */
1078 for (i
=0; i
< sk_X509_num(xs_ctx
.chain
); i
++)
1080 x
= sk_X509_value(xs_ctx
.chain
, i
);
1082 if (!dtls1_add_cert_to_buf(buf
, &l
, x
))
1084 X509_STORE_CTX_cleanup(&xs_ctx
);
1088 X509_STORE_CTX_cleanup(&xs_ctx
);
1090 /* Thawte special :-) */
1091 for (i
=0; i
<sk_X509_num(s
->ctx
->extra_certs
); i
++)
1093 x
=sk_X509_value(s
->ctx
->extra_certs
,i
);
1094 if (!dtls1_add_cert_to_buf(buf
, &l
, x
))
1098 l
-= (3 + DTLS1_HM_HEADER_LENGTH
);
1100 p
=(unsigned char *)&(buf
->data
[DTLS1_HM_HEADER_LENGTH
]);
1103 p
=(unsigned char *)&(buf
->data
[0]);
1104 p
= dtls1_set_message_header(s
, p
, SSL3_MT_CERTIFICATE
, l
, 0, l
);
1106 l
+=DTLS1_HM_HEADER_LENGTH
;
1110 int dtls1_read_failed(SSL
*s
, int code
)
1114 fprintf( stderr
, "invalid state reached %s:%d", __FILE__
, __LINE__
);
1118 if (!dtls1_is_timer_expired(s
))
1120 /* not a timeout, none of our business,
1121 let higher layers handle this. in fact it's probably an error */
1125 #ifndef OPENSSL_NO_HEARTBEATS
1126 if (!SSL_in_init(s
) && !s
->tlsext_hb_pending
) /* done, no need to send a retransmit */
1128 if (!SSL_in_init(s
)) /* done, no need to send a retransmit */
1131 BIO_set_flags(SSL_get_rbio(s
), BIO_FLAGS_READ
);
1135 #if 0 /* for now, each alert contains only one record number */
1136 item
= pqueue_peek(state
->rcvd_records
);
1139 /* send an alert immediately for all the missing records */
1144 #if 0 /* no more alert sending, just retransmit the last set of messages */
1145 if ( state
->timeout
.read_timeouts
>= DTLS1_TMO_READ_COUNT
)
1146 ssl3_send_alert(s
,SSL3_AL_WARNING
,
1147 DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
);
1150 return dtls1_handle_timeout(s
);
1154 dtls1_get_queue_priority(unsigned short seq
, int is_ccs
)
1156 /* The index of the retransmission queue actually is the message sequence number,
1157 * since the queue only contains messages of a single handshake. However, the
1158 * ChangeCipherSpec has no message sequence number and so using only the sequence
1159 * will result in the CCS and Finished having the same index. To prevent this,
1160 * the sequence number is multiplied by 2. In case of a CCS 1 is subtracted.
1161 * This does not only differ CSS and Finished, it also maintains the order of the
1162 * index (important for priority queues) and fits in the unsigned short variable.
1164 return seq
* 2 - is_ccs
;
1168 dtls1_retransmit_buffered_messages(SSL
*s
)
1170 pqueue sent
= s
->d1
->sent_messages
;
1176 iter
= pqueue_iterator(sent
);
1178 for ( item
= pqueue_next(&iter
); item
!= NULL
; item
= pqueue_next(&iter
))
1180 frag
= (hm_fragment
*)item
->data
;
1181 if ( dtls1_retransmit_message(s
,
1182 (unsigned short)dtls1_get_queue_priority(frag
->msg_header
.seq
, frag
->msg_header
.is_ccs
),
1183 0, &found
) <= 0 && found
)
1185 fprintf(stderr
, "dtls1_retransmit_message() failed\n");
1194 dtls1_buffer_message(SSL
*s
, int is_ccs
)
1198 unsigned char seq64be
[8];
1200 /* this function is called immediately after a message has
1201 * been serialized */
1202 OPENSSL_assert(s
->init_off
== 0);
1204 frag
= dtls1_hm_fragment_new(s
->init_num
, 0);
1208 memcpy(frag
->fragment
, s
->init_buf
->data
, s
->init_num
);
1212 OPENSSL_assert(s
->d1
->w_msg_hdr
.msg_len
+
1213 ((s
->version
==DTLS1_VERSION
)?DTLS1_CCS_HEADER_LENGTH
:3) == (unsigned int)s
->init_num
);
1217 OPENSSL_assert(s
->d1
->w_msg_hdr
.msg_len
+
1218 DTLS1_HM_HEADER_LENGTH
== (unsigned int)s
->init_num
);
1221 frag
->msg_header
.msg_len
= s
->d1
->w_msg_hdr
.msg_len
;
1222 frag
->msg_header
.seq
= s
->d1
->w_msg_hdr
.seq
;
1223 frag
->msg_header
.type
= s
->d1
->w_msg_hdr
.type
;
1224 frag
->msg_header
.frag_off
= 0;
1225 frag
->msg_header
.frag_len
= s
->d1
->w_msg_hdr
.msg_len
;
1226 frag
->msg_header
.is_ccs
= is_ccs
;
1228 /* save current state*/
1229 frag
->msg_header
.saved_retransmit_state
.enc_write_ctx
= s
->enc_write_ctx
;
1230 frag
->msg_header
.saved_retransmit_state
.write_hash
= s
->write_hash
;
1231 frag
->msg_header
.saved_retransmit_state
.compress
= s
->compress
;
1232 frag
->msg_header
.saved_retransmit_state
.session
= s
->session
;
1233 frag
->msg_header
.saved_retransmit_state
.epoch
= s
->d1
->w_epoch
;
1235 memset(seq64be
,0,sizeof(seq64be
));
1236 seq64be
[6] = (unsigned char)(dtls1_get_queue_priority(frag
->msg_header
.seq
,
1237 frag
->msg_header
.is_ccs
)>>8);
1238 seq64be
[7] = (unsigned char)(dtls1_get_queue_priority(frag
->msg_header
.seq
,
1239 frag
->msg_header
.is_ccs
));
1241 item
= pitem_new(seq64be
, frag
);
1244 dtls1_hm_fragment_free(frag
);
1249 fprintf( stderr
, "buffered messge: \ttype = %xx\n", msg_buf
->type
);
1250 fprintf( stderr
, "\t\t\t\t\tlen = %d\n", msg_buf
->len
);
1251 fprintf( stderr
, "\t\t\t\t\tseq_num = %d\n", msg_buf
->seq_num
);
1254 pqueue_insert(s
->d1
->sent_messages
, item
);
1259 dtls1_retransmit_message(SSL
*s
, unsigned short seq
, unsigned long frag_off
,
1263 /* XDTLS: for now assuming that read/writes are blocking */
1266 unsigned long header_length
;
1267 unsigned char seq64be
[8];
1268 struct dtls1_retransmit_state saved_state
;
1269 unsigned char save_write_sequence
[8];
1272 OPENSSL_assert(s->init_num == 0);
1273 OPENSSL_assert(s->init_off == 0);
1276 /* XDTLS: the requested message ought to be found, otherwise error */
1277 memset(seq64be
,0,sizeof(seq64be
));
1278 seq64be
[6] = (unsigned char)(seq
>>8);
1279 seq64be
[7] = (unsigned char)seq
;
1281 item
= pqueue_find(s
->d1
->sent_messages
, seq64be
);
1284 fprintf(stderr
, "retransmit: message %d non-existant\n", seq
);
1290 frag
= (hm_fragment
*)item
->data
;
1292 if ( frag
->msg_header
.is_ccs
)
1293 header_length
= DTLS1_CCS_HEADER_LENGTH
;
1295 header_length
= DTLS1_HM_HEADER_LENGTH
;
1297 memcpy(s
->init_buf
->data
, frag
->fragment
,
1298 frag
->msg_header
.msg_len
+ header_length
);
1299 s
->init_num
= frag
->msg_header
.msg_len
+ header_length
;
1301 dtls1_set_message_header_int(s
, frag
->msg_header
.type
,
1302 frag
->msg_header
.msg_len
, frag
->msg_header
.seq
, 0,
1303 frag
->msg_header
.frag_len
);
1305 /* save current state */
1306 saved_state
.enc_write_ctx
= s
->enc_write_ctx
;
1307 saved_state
.write_hash
= s
->write_hash
;
1308 saved_state
.compress
= s
->compress
;
1309 saved_state
.session
= s
->session
;
1310 saved_state
.epoch
= s
->d1
->w_epoch
;
1311 saved_state
.epoch
= s
->d1
->w_epoch
;
1313 s
->d1
->retransmitting
= 1;
1315 /* restore state in which the message was originally sent */
1316 s
->enc_write_ctx
= frag
->msg_header
.saved_retransmit_state
.enc_write_ctx
;
1317 s
->write_hash
= frag
->msg_header
.saved_retransmit_state
.write_hash
;
1318 s
->compress
= frag
->msg_header
.saved_retransmit_state
.compress
;
1319 s
->session
= frag
->msg_header
.saved_retransmit_state
.session
;
1320 s
->d1
->w_epoch
= frag
->msg_header
.saved_retransmit_state
.epoch
;
1322 if (frag
->msg_header
.saved_retransmit_state
.epoch
== saved_state
.epoch
- 1)
1324 memcpy(save_write_sequence
, s
->s3
->write_sequence
, sizeof(s
->s3
->write_sequence
));
1325 memcpy(s
->s3
->write_sequence
, s
->d1
->last_write_sequence
, sizeof(s
->s3
->write_sequence
));
1328 ret
= dtls1_do_write(s
, frag
->msg_header
.is_ccs
?
1329 SSL3_RT_CHANGE_CIPHER_SPEC
: SSL3_RT_HANDSHAKE
);
1331 /* restore current state */
1332 s
->enc_write_ctx
= saved_state
.enc_write_ctx
;
1333 s
->write_hash
= saved_state
.write_hash
;
1334 s
->compress
= saved_state
.compress
;
1335 s
->session
= saved_state
.session
;
1336 s
->d1
->w_epoch
= saved_state
.epoch
;
1338 if (frag
->msg_header
.saved_retransmit_state
.epoch
== saved_state
.epoch
- 1)
1340 memcpy(s
->d1
->last_write_sequence
, s
->s3
->write_sequence
, sizeof(s
->s3
->write_sequence
));
1341 memcpy(s
->s3
->write_sequence
, save_write_sequence
, sizeof(s
->s3
->write_sequence
));
1344 s
->d1
->retransmitting
= 0;
1346 (void)BIO_flush(SSL_get_wbio(s
));
1350 /* call this function when the buffered messages are no longer needed */
1352 dtls1_clear_record_buffer(SSL
*s
)
1356 for(item
= pqueue_pop(s
->d1
->sent_messages
);
1357 item
!= NULL
; item
= pqueue_pop(s
->d1
->sent_messages
))
1359 dtls1_hm_fragment_free((hm_fragment
*)item
->data
);
1366 dtls1_set_message_header(SSL
*s
, unsigned char *p
, unsigned char mt
,
1367 unsigned long len
, unsigned long frag_off
, unsigned long frag_len
)
1369 /* Don't change sequence numbers while listening */
1370 if (frag_off
== 0 && !s
->d1
->listen
)
1372 s
->d1
->handshake_write_seq
= s
->d1
->next_handshake_write_seq
;
1373 s
->d1
->next_handshake_write_seq
++;
1376 dtls1_set_message_header_int(s
, mt
, len
, s
->d1
->handshake_write_seq
,
1377 frag_off
, frag_len
);
1379 return p
+= DTLS1_HM_HEADER_LENGTH
;
1383 /* don't actually do the writing, wait till the MTU has been retrieved */
1385 dtls1_set_message_header_int(SSL
*s
, unsigned char mt
,
1386 unsigned long len
, unsigned short seq_num
, unsigned long frag_off
,
1387 unsigned long frag_len
)
1389 struct hm_header_st
*msg_hdr
= &s
->d1
->w_msg_hdr
;
1392 msg_hdr
->msg_len
= len
;
1393 msg_hdr
->seq
= seq_num
;
1394 msg_hdr
->frag_off
= frag_off
;
1395 msg_hdr
->frag_len
= frag_len
;
1399 dtls1_fix_message_header(SSL
*s
, unsigned long frag_off
,
1400 unsigned long frag_len
)
1402 struct hm_header_st
*msg_hdr
= &s
->d1
->w_msg_hdr
;
1404 msg_hdr
->frag_off
= frag_off
;
1405 msg_hdr
->frag_len
= frag_len
;
1408 static unsigned char *
1409 dtls1_write_message_header(SSL
*s
, unsigned char *p
)
1411 struct hm_header_st
*msg_hdr
= &s
->d1
->w_msg_hdr
;
1413 *p
++ = msg_hdr
->type
;
1414 l2n3(msg_hdr
->msg_len
, p
);
1416 s2n(msg_hdr
->seq
, p
);
1417 l2n3(msg_hdr
->frag_off
, p
);
1418 l2n3(msg_hdr
->frag_len
, p
);
1426 return (g_probable_mtu
[(sizeof(g_probable_mtu
) /
1427 sizeof(g_probable_mtu
[0])) - 1]);
1431 dtls1_guess_mtu(unsigned int curr_mtu
)
1435 if ( curr_mtu
== 0 )
1436 return g_probable_mtu
[0] ;
1438 for ( i
= 0; i
< sizeof(g_probable_mtu
)/sizeof(g_probable_mtu
[0]); i
++)
1439 if ( curr_mtu
> g_probable_mtu
[i
])
1440 return g_probable_mtu
[i
];
1446 dtls1_get_message_header(unsigned char *data
, struct hm_header_st
*msg_hdr
)
1448 memset(msg_hdr
, 0x00, sizeof(struct hm_header_st
));
1449 msg_hdr
->type
= *(data
++);
1450 n2l3(data
, msg_hdr
->msg_len
);
1452 n2s(data
, msg_hdr
->seq
);
1453 n2l3(data
, msg_hdr
->frag_off
);
1454 n2l3(data
, msg_hdr
->frag_len
);
1458 dtls1_get_ccs_header(unsigned char *data
, struct ccs_header_st
*ccs_hdr
)
1460 memset(ccs_hdr
, 0x00, sizeof(struct ccs_header_st
));
1462 ccs_hdr
->type
= *(data
++);
1465 int dtls1_shutdown(SSL
*s
)
1468 #ifndef OPENSSL_NO_SCTP
1469 if (BIO_dgram_is_sctp(SSL_get_wbio(s
)) &&
1470 !(s
->shutdown
& SSL_SENT_SHUTDOWN
))
1472 ret
= BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s
));
1473 if (ret
< 0) return -1;
1476 BIO_ctrl(SSL_get_wbio(s
), BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN
, 1, NULL
);
1479 ret
= ssl3_shutdown(s
);
1480 #ifndef OPENSSL_NO_SCTP
1481 BIO_ctrl(SSL_get_wbio(s
), BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN
, 0, NULL
);
1486 #ifndef OPENSSL_NO_HEARTBEATS
1488 dtls1_process_heartbeat(SSL
*s
)
1490 unsigned char *p
= &s
->s3
->rrec
.data
[0], *pl
;
1491 unsigned short hbtype
;
1492 unsigned int payload
;
1493 unsigned int padding
= 16; /* Use minimum padding */
1495 if (s
->msg_callback
)
1496 s
->msg_callback(0, s
->version
, TLS1_RT_HEARTBEAT
,
1497 &s
->s3
->rrec
.data
[0], s
->s3
->rrec
.length
,
1498 s
, s
->msg_callback_arg
);
1500 /* Read type and payload length first */
1501 if (1 + 2 + 16 > s
->s3
->rrec
.length
)
1502 return 0; /* silently discard */
1505 if (1 + 2 + payload
+ 16 > s
->s3
->rrec
.length
)
1506 return 0; /* silently discard per RFC 6520 sec. 4 */
1509 if (hbtype
== TLS1_HB_REQUEST
)
1511 unsigned char *buffer
, *bp
;
1512 unsigned int write_length
= 1 /* heartbeat type */ +
1513 2 /* heartbeat length */ +
1517 if (write_length
> SSL3_RT_MAX_PLAIN_LENGTH
)
1520 /* Allocate memory for the response, size is 1 byte
1521 * message type, plus 2 bytes payload length, plus
1522 * payload, plus padding
1524 buffer
= OPENSSL_malloc(write_length
);
1527 /* Enter response type, length and copy payload */
1528 *bp
++ = TLS1_HB_RESPONSE
;
1530 memcpy(bp
, pl
, payload
);
1532 /* Random padding */
1533 RAND_pseudo_bytes(bp
, padding
);
1535 r
= dtls1_write_bytes(s
, TLS1_RT_HEARTBEAT
, buffer
, write_length
);
1537 if (r
>= 0 && s
->msg_callback
)
1538 s
->msg_callback(1, s
->version
, TLS1_RT_HEARTBEAT
,
1539 buffer
, write_length
,
1540 s
, s
->msg_callback_arg
);
1542 OPENSSL_free(buffer
);
1547 else if (hbtype
== TLS1_HB_RESPONSE
)
1551 /* We only send sequence numbers (2 bytes unsigned int),
1552 * and 16 random bytes, so we just try to read the
1553 * sequence number */
1556 if (payload
== 18 && seq
== s
->tlsext_hb_seq
)
1558 dtls1_stop_timer(s
);
1560 s
->tlsext_hb_pending
= 0;
1568 dtls1_heartbeat(SSL
*s
)
1570 unsigned char *buf
, *p
;
1572 unsigned int payload
= 18; /* Sequence number + random bytes */
1573 unsigned int padding
= 16; /* Use minimum padding */
1575 /* Only send if peer supports and accepts HB requests... */
1576 if (!(s
->tlsext_heartbeat
& SSL_TLSEXT_HB_ENABLED
) ||
1577 s
->tlsext_heartbeat
& SSL_TLSEXT_HB_DONT_SEND_REQUESTS
)
1579 SSLerr(SSL_F_DTLS1_HEARTBEAT
,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT
);
1583 /* ...and there is none in flight yet... */
1584 if (s
->tlsext_hb_pending
)
1586 SSLerr(SSL_F_DTLS1_HEARTBEAT
,SSL_R_TLS_HEARTBEAT_PENDING
);
1590 /* ...and no handshake in progress. */
1591 if (SSL_in_init(s
) || s
->in_handshake
)
1593 SSLerr(SSL_F_DTLS1_HEARTBEAT
,SSL_R_UNEXPECTED_MESSAGE
);
1597 /* Check if padding is too long, payload and padding
1598 * must not exceed 2^14 - 3 = 16381 bytes in total.
1600 OPENSSL_assert(payload
+ padding
<= 16381);
1602 /* Create HeartBeat message, we just use a sequence number
1603 * as payload to distuingish different messages and add
1604 * some random stuff.
1605 * - Message Type, 1 byte
1606 * - Payload Length, 2 bytes (unsigned int)
1607 * - Payload, the sequence number (2 bytes uint)
1608 * - Payload, random bytes (16 bytes uint)
1611 buf
= OPENSSL_malloc(1 + 2 + payload
+ padding
);
1614 *p
++ = TLS1_HB_REQUEST
;
1615 /* Payload length (18 bytes here) */
1617 /* Sequence number */
1618 s2n(s
->tlsext_hb_seq
, p
);
1619 /* 16 random bytes */
1620 RAND_pseudo_bytes(p
, 16);
1622 /* Random padding */
1623 RAND_pseudo_bytes(p
, padding
);
1625 ret
= dtls1_write_bytes(s
, TLS1_RT_HEARTBEAT
, buf
, 3 + payload
+ padding
);
1628 if (s
->msg_callback
)
1629 s
->msg_callback(1, s
->version
, TLS1_RT_HEARTBEAT
,
1630 buf
, 3 + payload
+ padding
,
1631 s
, s
->msg_callback_arg
);
1633 dtls1_start_timer(s
);
1634 s
->tlsext_hb_pending
= 1;