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>
127 /* XDTLS: figure out the right values */
128 static unsigned int g_probable_mtu
[] = {1500 - 28, 512 - 28, 256 - 28};
130 static unsigned int dtls1_min_mtu(void);
131 static unsigned int dtls1_guess_mtu(unsigned int curr_mtu
);
132 static void dtls1_fix_message_header(SSL
*s
, unsigned long frag_off
,
133 unsigned long frag_len
);
134 static unsigned char *dtls1_write_message_header(SSL
*s
,
136 static 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
);
139 static int dtls1_retransmit_buffered_messages(SSL
*s
);
140 static long dtls1_get_message_fragment(SSL
*s
, int st1
, int stn
,
144 dtls1_hm_fragment_new(unsigned long frag_len
)
146 hm_fragment
*frag
= NULL
;
147 unsigned char *buf
= NULL
;
149 frag
= (hm_fragment
*)OPENSSL_malloc(sizeof(hm_fragment
));
155 buf
= (unsigned char *)OPENSSL_malloc(frag_len
);
163 /* zero length fragment gets zero frag->fragment */
164 frag
->fragment
= buf
;
170 dtls1_hm_fragment_free(hm_fragment
*frag
)
172 if (frag
->fragment
) OPENSSL_free(frag
->fragment
);
176 /* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */
177 int dtls1_do_write(SSL
*s
, int type
)
181 unsigned int len
, frag_off
;
183 /* AHA! Figure out the MTU, and stick to the right size */
184 if ( ! (SSL_get_options(s
) & SSL_OP_NO_QUERY_MTU
))
187 BIO_ctrl(SSL_get_wbio(s
), BIO_CTRL_DGRAM_QUERY_MTU
, 0, NULL
);
189 /* I've seen the kernel return bogus numbers when it doesn't know
190 * (initial write), so just make sure we have a reasonable number */
191 if ( s
->d1
->mtu
< dtls1_min_mtu())
194 s
->d1
->mtu
= dtls1_guess_mtu(s
->d1
->mtu
);
195 BIO_ctrl(SSL_get_wbio(s
), BIO_CTRL_DGRAM_SET_MTU
,
202 fprintf(stderr
, "using MTU = %d\n", mtu
);
204 mtu
-= (DTLS1_HM_HEADER_LENGTH
+ DTLS1_RT_HEADER_LENGTH
);
206 curr_mtu
= mtu
- BIO_wpending(SSL_get_wbio(s
));
210 else if ( ( ret
= BIO_flush(SSL_get_wbio(s
))) <= 0)
213 if ( BIO_wpending(SSL_get_wbio(s
)) + s
->init_num
>= mtu
)
215 ret
= BIO_flush(SSL_get_wbio(s
));
218 mtu
= s
->d1
->mtu
- (DTLS1_HM_HEADER_LENGTH
+ DTLS1_RT_HEADER_LENGTH
);
221 OPENSSL_assert(mtu
> 0); /* should have something reasonable now */
225 if ( s
->init_off
== 0 && type
== SSL3_RT_HANDSHAKE
)
226 OPENSSL_assert(s
->init_num
==
227 (int)s
->d1
->w_msg_hdr
.msg_len
+ DTLS1_HM_HEADER_LENGTH
);
232 curr_mtu
= s
->d1
->mtu
- BIO_wpending(SSL_get_wbio(s
)) -
233 DTLS1_RT_HEADER_LENGTH
;
235 if ( curr_mtu
<= DTLS1_HM_HEADER_LENGTH
)
237 /* grr.. we could get an error if MTU picked was wrong */
238 ret
= BIO_flush(SSL_get_wbio(s
));
241 curr_mtu
= s
->d1
->mtu
- DTLS1_RT_HEADER_LENGTH
;
244 if ( s
->init_num
> curr_mtu
)
250 /* XDTLS: this function is too long. split out the CCS part */
251 if ( type
== SSL3_RT_HANDSHAKE
)
253 if ( s
->init_off
!= 0)
255 OPENSSL_assert(s
->init_off
> DTLS1_HM_HEADER_LENGTH
);
256 s
->init_off
-= DTLS1_HM_HEADER_LENGTH
;
257 s
->init_num
+= DTLS1_HM_HEADER_LENGTH
;
259 /* write atleast DTLS1_HM_HEADER_LENGTH bytes */
260 if ( len
<= DTLS1_HM_HEADER_LENGTH
)
261 len
+= DTLS1_HM_HEADER_LENGTH
;
264 dtls1_fix_message_header(s
, frag_off
,
265 len
- DTLS1_HM_HEADER_LENGTH
);
267 dtls1_write_message_header(s
, (unsigned char *)&s
->init_buf
->data
[s
->init_off
]);
269 OPENSSL_assert(len
>= DTLS1_HM_HEADER_LENGTH
);
272 ret
=dtls1_write_bytes(s
,type
,&s
->init_buf
->data
[s
->init_off
],
276 /* might need to update MTU here, but we don't know
277 * which previous packet caused the failure -- so can't
278 * really retransmit anything. continue as if everything
279 * is fine and wait for an alert to handle the
282 if ( BIO_ctrl(SSL_get_wbio(s
),
283 BIO_CTRL_DGRAM_MTU_EXCEEDED
, 0, NULL
))
284 s
->d1
->mtu
= BIO_ctrl(SSL_get_wbio(s
),
285 BIO_CTRL_DGRAM_QUERY_MTU
, 0, NULL
);
292 /* bad if this assert fails, only part of the handshake
293 * message got sent. but why would this happen? */
294 OPENSSL_assert(len
== (unsigned int)ret
);
296 if (type
== SSL3_RT_HANDSHAKE
&& ! s
->d1
->retransmitting
)
298 /* should not be done for 'Hello Request's, but in that case
299 * we'll ignore the result anyway */
300 unsigned char *p
= (unsigned char *)&s
->init_buf
->data
[s
->init_off
];
301 const struct hm_header_st
*msg_hdr
= &s
->d1
->w_msg_hdr
;
306 /* reconstruct message header is if it
307 * is being sent in single fragment */
308 *p
++ = msg_hdr
->type
;
309 l2n3(msg_hdr
->msg_len
,p
);
310 s2n (msg_hdr
->seq
,p
);
312 l2n3(msg_hdr
->msg_len
,p
);
313 p
-= DTLS1_HM_HEADER_LENGTH
;
318 p
+= DTLS1_HM_HEADER_LENGTH
;
319 xlen
= ret
- DTLS1_HM_HEADER_LENGTH
;
322 ssl3_finish_mac(s
, p
, xlen
);
325 if (ret
== s
->init_num
)
328 s
->msg_callback(1, s
->version
, type
, s
->init_buf
->data
,
329 (size_t)(s
->init_off
+ s
->init_num
), s
,
330 s
->msg_callback_arg
);
332 s
->init_off
= 0; /* done writing this message */
339 frag_off
+= (ret
-= DTLS1_HM_HEADER_LENGTH
);
346 /* Obtain handshake message of message type 'mt' (any if mt == -1),
347 * maximum acceptable body length 'max'.
348 * Read an entire handshake message. Handshake messages arrive in
351 long dtls1_get_message(SSL
*s
, int st1
, int stn
, int mt
, long max
, int *ok
)
354 struct hm_header_st
*msg_hdr
;
356 /* s3->tmp is used to store messages that are unexpected, caused
357 * by the absence of an optional handshake message */
358 if (s
->s3
->tmp
.reuse_message
)
360 s
->s3
->tmp
.reuse_message
=0;
361 if ((mt
>= 0) && (s
->s3
->tmp
.message_type
!= mt
))
363 al
=SSL_AD_UNEXPECTED_MESSAGE
;
364 SSLerr(SSL_F_DTLS1_GET_MESSAGE
,SSL_R_UNEXPECTED_MESSAGE
);
368 s
->init_msg
= s
->init_buf
->data
+ DTLS1_HM_HEADER_LENGTH
;
369 s
->init_num
= (int)s
->s3
->tmp
.message_size
;
373 msg_hdr
= &s
->d1
->r_msg_hdr
;
376 if ( msg_hdr
->frag_off
== 0)
378 /* s->d1->r_message_header.msg_len = 0; */
379 memset(msg_hdr
, 0x00, sizeof(struct hm_header_st
));
382 i
= dtls1_get_message_fragment(s
, st1
, stn
, max
, ok
);
383 if ( i
== DTLS1_HM_BAD_FRAGMENT
||
384 i
== DTLS1_HM_FRAGMENT_RETRY
) /* bad fragment received */
386 else if ( i
<= 0 && !*ok
)
389 /* Note that s->init_sum is used as a counter summing
390 * up fragments' lengths: as soon as they sum up to
391 * handshake packet length, we assume we have got all
392 * the fragments. Overlapping fragments would cause
393 * premature termination, so we don't expect overlaps.
394 * Well, handling overlaps would require something more
395 * drastic. Indeed, as it is now there is no way to
396 * tell if out-of-order fragment from the middle was
397 * the last. '>=' is the best/least we can do to control
398 * the potential damage caused by malformed overlaps. */
399 if ((unsigned int)s
->init_num
>= msg_hdr
->msg_len
)
401 unsigned char *p
= (unsigned char *)s
->init_buf
->data
;
402 unsigned long msg_len
= msg_hdr
->msg_len
;
404 /* reconstruct message header as if it was
405 * sent in single fragment */
406 *(p
++) = msg_hdr
->type
;
408 s2n (msg_hdr
->seq
,p
);
411 p
-= DTLS1_HM_HEADER_LENGTH
;
412 msg_len
+= DTLS1_HM_HEADER_LENGTH
;
414 ssl3_finish_mac(s
, p
, msg_len
);
416 s
->msg_callback(0, s
->version
, SSL3_RT_HANDSHAKE
,
418 s
, s
->msg_callback_arg
);
420 memset(msg_hdr
, 0x00, sizeof(struct hm_header_st
));
422 s
->d1
->handshake_read_seq
++;
423 /* we just read a handshake message from the other side:
424 * this means that we don't need to retransmit of the
426 * XDTLS: may be able clear out this
427 * buffer a little sooner (i.e if an out-of-order
428 * handshake message/record is received at the record
430 * XDTLS: exception is that the server needs to
431 * know that change cipher spec and finished messages
432 * have been received by the client before clearing this
433 * buffer. this can simply be done by waiting for the
434 * first data segment, but is there a better way? */
435 dtls1_clear_record_buffer(s
);
437 s
->init_msg
= s
->init_buf
->data
+ DTLS1_HM_HEADER_LENGTH
;
441 msg_hdr
->frag_off
= i
;
445 ssl3_send_alert(s
,SSL3_AL_FATAL
,al
);
451 static int dtls1_preprocess_fragment(SSL
*s
,struct hm_header_st
*msg_hdr
,int max
)
453 size_t frag_off
,frag_len
,msg_len
;
455 msg_len
= msg_hdr
->msg_len
;
456 frag_off
= msg_hdr
->frag_off
;
457 frag_len
= msg_hdr
->frag_len
;
459 /* sanity checking */
460 if ( (frag_off
+frag_len
) > msg_len
)
462 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT
,SSL_R_EXCESSIVE_MESSAGE_SIZE
);
463 return SSL_AD_ILLEGAL_PARAMETER
;
466 if ( (frag_off
+frag_len
) > (unsigned long)max
)
468 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT
,SSL_R_EXCESSIVE_MESSAGE_SIZE
);
469 return SSL_AD_ILLEGAL_PARAMETER
;
472 if ( s
->d1
->r_msg_hdr
.frag_off
== 0) /* first fragment */
474 /* msg_len is limited to 2^24, but is effectively checked
475 * against max above */
476 if (!BUF_MEM_grow_clean(s
->init_buf
,msg_len
+DTLS1_HM_HEADER_LENGTH
))
478 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT
,ERR_R_BUF_LIB
);
479 return SSL_AD_INTERNAL_ERROR
;
482 s
->s3
->tmp
.message_size
= msg_len
;
483 s
->d1
->r_msg_hdr
.msg_len
= msg_len
;
484 s
->s3
->tmp
.message_type
= msg_hdr
->type
;
485 s
->d1
->r_msg_hdr
.type
= msg_hdr
->type
;
486 s
->d1
->r_msg_hdr
.seq
= msg_hdr
->seq
;
488 else if (msg_len
!= s
->d1
->r_msg_hdr
.msg_len
)
490 /* They must be playing with us! BTW, failure to enforce
491 * upper limit would open possibility for buffer overrun. */
492 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT
,SSL_R_EXCESSIVE_MESSAGE_SIZE
);
493 return SSL_AD_ILLEGAL_PARAMETER
;
496 return 0; /* no error */
501 dtls1_retrieve_buffered_fragment(SSL
*s
, long max
, int *ok
)
503 /* (0) check whether the desired fragment is available
505 * (1) copy over the fragment to s->init_buf->data[]
506 * (2) update s->init_num
513 item
= pqueue_peek(s
->d1
->buffered_messages
);
517 frag
= (hm_fragment
*)item
->data
;
519 if ( s
->d1
->handshake_read_seq
== frag
->msg_header
.seq
)
521 pqueue_pop(s
->d1
->buffered_messages
);
523 al
=dtls1_preprocess_fragment(s
,&frag
->msg_header
,max
);
525 if (al
==0) /* no alert */
527 unsigned char *p
= (unsigned char *)s
->init_buf
->data
+DTLS1_HM_HEADER_LENGTH
;
528 memcpy(&p
[frag
->msg_header
.frag_off
],
529 frag
->fragment
,frag
->msg_header
.frag_len
);
532 dtls1_hm_fragment_free(frag
);
538 return frag
->msg_header
.frag_len
;
541 ssl3_send_alert(s
,SSL3_AL_FATAL
,al
);
552 dtls1_process_out_of_seq_message(SSL
*s
, struct hm_header_st
* msg_hdr
, int *ok
)
555 hm_fragment
*frag
= NULL
;
557 unsigned char seq64be
[8];
558 unsigned long frag_len
= msg_hdr
->frag_len
;
560 if ((msg_hdr
->frag_off
+frag_len
) > msg_hdr
->msg_len
)
563 if (msg_hdr
->seq
<= s
->d1
->handshake_read_seq
)
565 unsigned char devnull
[256];
569 i
= s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,
571 frag_len
>sizeof(devnull
)?sizeof(devnull
):frag_len
,0);
577 frag
= dtls1_hm_fragment_new(frag_len
);
581 memcpy(&(frag
->msg_header
), msg_hdr
, sizeof(*msg_hdr
));
585 /* read the body of the fragment (header has already been read */
586 i
= s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,
587 frag
->fragment
,frag_len
,0);
588 if (i
<=0 || (unsigned long)i
!=frag_len
)
592 memset(seq64be
,0,sizeof(seq64be
));
593 seq64be
[6] = (unsigned char)(msg_hdr
->seq
>>8);
594 seq64be
[7] = (unsigned char)(msg_hdr
->seq
);
596 item
= pitem_new(seq64be
, frag
);
600 pqueue_insert(s
->d1
->buffered_messages
, item
);
601 return DTLS1_HM_FRAGMENT_RETRY
;
604 if ( frag
!= NULL
) dtls1_hm_fragment_free(frag
);
605 if ( item
!= NULL
) OPENSSL_free(item
);
612 dtls1_get_message_fragment(SSL
*s
, int st1
, int stn
, long max
, int *ok
)
614 unsigned char wire
[DTLS1_HM_HEADER_LENGTH
];
615 unsigned long l
, frag_off
, frag_len
;
617 struct hm_header_st msg_hdr
;
619 /* see if we have the required fragment already */
620 if ((frag_len
= dtls1_retrieve_buffered_fragment(s
,max
,ok
)) || *ok
)
622 if (*ok
) s
->init_num
+= frag_len
;
626 /* read handshake message header */
627 i
=s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,wire
,
628 DTLS1_HM_HEADER_LENGTH
, 0);
629 if (i
<= 0) /* nbio, or an error */
631 s
->rwstate
=SSL_READING
;
635 OPENSSL_assert(i
== DTLS1_HM_HEADER_LENGTH
);
637 /* parse the message fragment header */
638 dtls1_get_message_header(wire
, &msg_hdr
);
641 * if this is a future (or stale) message it gets buffered
642 * (or dropped)--no further processing at this time
644 if ( msg_hdr
.seq
!= s
->d1
->handshake_read_seq
)
645 return dtls1_process_out_of_seq_message(s
, &msg_hdr
, ok
);
648 frag_off
= msg_hdr
.frag_off
;
649 frag_len
= msg_hdr
.frag_len
;
651 if (!s
->server
&& s
->d1
->r_msg_hdr
.frag_off
== 0 &&
652 wire
[0] == SSL3_MT_HELLO_REQUEST
)
654 /* The server may always send 'Hello Request' messages --
655 * we are doing a handshake anyway now, so ignore them
656 * if their format is correct. Does not count for
658 if (wire
[1] == 0 && wire
[2] == 0 && wire
[3] == 0)
661 s
->msg_callback(0, s
->version
, SSL3_RT_HANDSHAKE
,
662 wire
, DTLS1_HM_HEADER_LENGTH
, s
,
663 s
->msg_callback_arg
);
666 return dtls1_get_message_fragment(s
, st1
, stn
,
669 else /* Incorrectly formated Hello request */
671 al
=SSL_AD_UNEXPECTED_MESSAGE
;
672 SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT
,SSL_R_UNEXPECTED_MESSAGE
);
677 if ((al
=dtls1_preprocess_fragment(s
,&msg_hdr
,max
)))
680 /* XDTLS: ressurect this when restart is in place */
685 unsigned char *p
=(unsigned char *)s
->init_buf
->data
+DTLS1_HM_HEADER_LENGTH
;
687 i
=s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,
688 &p
[frag_off
],frag_len
,0);
689 /* XDTLS: fix this--message fragments cannot span multiple packets */
692 s
->rwstate
=SSL_READING
;
700 /* XDTLS: an incorrectly formatted fragment should cause the
701 * handshake to fail */
702 OPENSSL_assert(i
== (int)frag_len
);
706 /* Note that s->init_num is *not* used as current offset in
707 * s->init_buf->data, but as a counter summing up fragments'
708 * lengths: as soon as they sum up to handshake packet
709 * length, we assume we have got all the fragments. */
710 s
->init_num
+= frag_len
;
714 ssl3_send_alert(s
,SSL3_AL_FATAL
,al
);
721 int dtls1_send_finished(SSL
*s
, int a
, int b
, const char *sender
, int slen
)
729 d
=(unsigned char *)s
->init_buf
->data
;
730 p
= &(d
[DTLS1_HM_HEADER_LENGTH
]);
732 i
=s
->method
->ssl3_enc
->final_finish_mac(s
,
733 sender
,slen
,s
->s3
->tmp
.finish_md
);
734 s
->s3
->tmp
.finish_md_len
= i
;
735 memcpy(p
, s
->s3
->tmp
.finish_md
, i
);
739 #ifdef OPENSSL_SYS_WIN16
740 /* MSVC 1.5 does not clear the top bytes of the word unless
746 d
= dtls1_set_message_header(s
, d
, SSL3_MT_FINISHED
, l
, 0, l
);
747 s
->init_num
=(int)l
+DTLS1_HM_HEADER_LENGTH
;
750 /* buffer the message to handle re-xmits */
751 dtls1_buffer_message(s
, 0);
756 /* SSL3_ST_SEND_xxxxxx_HELLO_B */
757 return(dtls1_do_write(s
,SSL3_RT_HANDSHAKE
));
760 /* for these 2 messages, we need to
761 * ssl->enc_read_ctx re-init
762 * ssl->s3->read_sequence zero
763 * ssl->s3->read_mac_secret re-init
764 * ssl->session->read_sym_enc assign
765 * ssl->session->read_compression assign
766 * ssl->session->read_hash assign
768 int dtls1_send_change_cipher_spec(SSL
*s
, int a
, int b
)
774 p
=(unsigned char *)s
->init_buf
->data
;
776 s
->d1
->handshake_write_seq
= s
->d1
->next_handshake_write_seq
;
777 s
->init_num
=DTLS1_CCS_HEADER_LENGTH
;
780 dtls1_set_message_header_int(s
, SSL3_MT_CCS
, 0,
781 s
->d1
->handshake_write_seq
, 0, 0);
783 /* buffer the message to handle re-xmits */
784 dtls1_buffer_message(s
, 1);
789 /* SSL3_ST_CW_CHANGE_B */
790 return(dtls1_do_write(s
,SSL3_RT_CHANGE_CIPHER_SPEC
));
793 unsigned long dtls1_output_cert_chain(SSL
*s
, X509
*x
)
797 unsigned long l
= 3 + DTLS1_HM_HEADER_LENGTH
;
799 X509_STORE_CTX xs_ctx
;
802 /* TLSv1 sends a chain with nothing in it, instead of an alert */
804 if (!BUF_MEM_grow_clean(buf
,10))
806 SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN
,ERR_R_BUF_LIB
);
811 if(!X509_STORE_CTX_init(&xs_ctx
,s
->ctx
->cert_store
,NULL
,NULL
))
813 SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN
,ERR_R_X509_LIB
);
820 if (!BUF_MEM_grow_clean(buf
,(n
+l
+3)))
822 SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN
,ERR_R_BUF_LIB
);
825 p
=(unsigned char *)&(buf
->data
[l
]);
829 if (X509_NAME_cmp(X509_get_subject_name(x
),
830 X509_get_issuer_name(x
)) == 0) break;
832 i
=X509_STORE_get_by_subject(&xs_ctx
,X509_LU_X509
,
833 X509_get_issuer_name(x
),&obj
);
836 /* Count is one too high since the X509_STORE_get uped the
841 X509_STORE_CTX_cleanup(&xs_ctx
);
844 /* Thawte special :-) */
845 if (s
->ctx
->extra_certs
!= NULL
)
846 for (i
=0; i
<sk_X509_num(s
->ctx
->extra_certs
); i
++)
848 x
=sk_X509_value(s
->ctx
->extra_certs
,i
);
850 if (!BUF_MEM_grow_clean(buf
,(n
+l
+3)))
852 SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN
,ERR_R_BUF_LIB
);
855 p
=(unsigned char *)&(buf
->data
[l
]);
861 l
-= (3 + DTLS1_HM_HEADER_LENGTH
);
863 p
=(unsigned char *)&(buf
->data
[DTLS1_HM_HEADER_LENGTH
]);
866 p
=(unsigned char *)&(buf
->data
[0]);
867 p
= dtls1_set_message_header(s
, p
, SSL3_MT_CERTIFICATE
, l
, 0, l
);
869 l
+=DTLS1_HM_HEADER_LENGTH
;
873 int dtls1_read_failed(SSL
*s
, int code
)
881 fprintf( stderr
, "invalid state reached %s:%d", __FILE__
, __LINE__
);
885 bio
= SSL_get_rbio(s
);
886 if ( ! BIO_dgram_recv_timedout(bio
))
888 /* not a timeout, none of our business,
889 let higher layers handle this. in fact it's probably an error */
893 if ( ! SSL_in_init(s
)) /* done, no need to send a retransmit */
895 BIO_set_flags(SSL_get_rbio(s
), BIO_FLAGS_READ
);
900 state
->timeout
.num_alerts
++;
901 if ( state
->timeout
.num_alerts
> DTLS1_TMO_ALERT_COUNT
)
903 /* fail the connection, enough alerts have been sent */
904 SSLerr(SSL_F_DTLS1_READ_FAILED
,SSL_R_READ_TIMEOUT_EXPIRED
);
908 state
->timeout
.read_timeouts
++;
909 if ( state
->timeout
.read_timeouts
> DTLS1_TMO_READ_COUNT
)
912 state
->timeout
.read_timeouts
= 1;
916 #if 0 /* for now, each alert contains only one record number */
917 item
= pqueue_peek(state
->rcvd_records
);
920 /* send an alert immediately for all the missing records */
925 #if 0 /* no more alert sending, just retransmit the last set of messages */
927 ssl3_send_alert(s
,SSL3_AL_WARNING
,
928 DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
);
931 return dtls1_retransmit_buffered_messages(s
) ;
936 dtls1_retransmit_buffered_messages(SSL
*s
)
938 pqueue sent
= s
->d1
->sent_messages
;
944 iter
= pqueue_iterator(sent
);
946 for ( item
= pqueue_next(&iter
); item
!= NULL
; item
= pqueue_next(&iter
))
948 frag
= (hm_fragment
*)item
->data
;
949 if ( dtls1_retransmit_message(s
, frag
->msg_header
.seq
, 0, &found
) <= 0 &&
952 fprintf(stderr
, "dtls1_retransmit_message() failed\n");
961 dtls1_buffer_message(SSL
*s
, int is_ccs
)
965 unsigned char seq64be
[8];
966 unsigned int epoch
= s
->d1
->w_epoch
;
968 /* this function is called immediately after a message has
970 OPENSSL_assert(s
->init_off
== 0);
972 frag
= dtls1_hm_fragment_new(s
->init_num
);
974 memcpy(frag
->fragment
, s
->init_buf
->data
, s
->init_num
);
978 OPENSSL_assert(s
->d1
->w_msg_hdr
.msg_len
+
979 DTLS1_CCS_HEADER_LENGTH
== (unsigned int)s
->init_num
);
984 OPENSSL_assert(s
->d1
->w_msg_hdr
.msg_len
+
985 DTLS1_HM_HEADER_LENGTH
== (unsigned int)s
->init_num
);
988 frag
->msg_header
.msg_len
= s
->d1
->w_msg_hdr
.msg_len
;
989 frag
->msg_header
.seq
= s
->d1
->w_msg_hdr
.seq
;
990 frag
->msg_header
.type
= s
->d1
->w_msg_hdr
.type
;
991 frag
->msg_header
.frag_off
= 0;
992 frag
->msg_header
.frag_len
= s
->d1
->w_msg_hdr
.msg_len
;
993 frag
->msg_header
.is_ccs
= is_ccs
;
995 memset(seq64be
,0,sizeof(seq64be
));
996 seq64be
[0] = (unsigned char)(epoch
>>8);
997 seq64be
[1] = (unsigned char)(epoch
);
998 seq64be
[6] = (unsigned char)(frag
->msg_header
.seq
>>8);
999 seq64be
[7] = (unsigned char)(frag
->msg_header
.seq
);
1001 item
= pitem_new(seq64be
, frag
);
1004 dtls1_hm_fragment_free(frag
);
1009 fprintf( stderr
, "buffered messge: \ttype = %xx\n", msg_buf
->type
);
1010 fprintf( stderr
, "\t\t\t\t\tlen = %d\n", msg_buf
->len
);
1011 fprintf( stderr
, "\t\t\t\t\tseq_num = %d\n", msg_buf
->seq_num
);
1014 pqueue_insert(s
->d1
->sent_messages
, item
);
1019 dtls1_retransmit_message(SSL
*s
, unsigned short seq
, unsigned long frag_off
,
1023 /* XDTLS: for now assuming that read/writes are blocking */
1026 unsigned long header_length
;
1027 unsigned char seq64be
[8];
1030 OPENSSL_assert(s->init_num == 0);
1031 OPENSSL_assert(s->init_off == 0);
1034 /* XDTLS: the requested message ought to be found, otherwise error */
1035 memset(seq64be
,0,sizeof(seq64be
));
1036 seq64be
[6] = (unsigned char)(seq
>>8);
1037 seq64be
[7] = (unsigned char)seq
;
1039 item
= pqueue_find(s
->d1
->sent_messages
, seq64be
);
1042 fprintf(stderr
, "retransmit: message %d non-existant\n", seq
);
1048 frag
= (hm_fragment
*)item
->data
;
1050 if ( frag
->msg_header
.is_ccs
)
1051 header_length
= DTLS1_CCS_HEADER_LENGTH
;
1053 header_length
= DTLS1_HM_HEADER_LENGTH
;
1055 memcpy(s
->init_buf
->data
, frag
->fragment
,
1056 frag
->msg_header
.msg_len
+ header_length
);
1057 s
->init_num
= frag
->msg_header
.msg_len
+ header_length
;
1059 dtls1_set_message_header_int(s
, frag
->msg_header
.type
,
1060 frag
->msg_header
.msg_len
, frag
->msg_header
.seq
, 0,
1061 frag
->msg_header
.frag_len
);
1063 s
->d1
->retransmitting
= 1;
1064 ret
= dtls1_do_write(s
, frag
->msg_header
.is_ccs
?
1065 SSL3_RT_CHANGE_CIPHER_SPEC
: SSL3_RT_HANDSHAKE
);
1066 s
->d1
->retransmitting
= 0;
1068 (void)BIO_flush(SSL_get_wbio(s
));
1072 /* call this function when the buffered messages are no longer needed */
1074 dtls1_clear_record_buffer(SSL
*s
)
1078 for(item
= pqueue_pop(s
->d1
->sent_messages
);
1079 item
!= NULL
; item
= pqueue_pop(s
->d1
->sent_messages
))
1081 dtls1_hm_fragment_free((hm_fragment
*)item
->data
);
1088 dtls1_set_message_header(SSL
*s
, unsigned char *p
, unsigned char mt
,
1089 unsigned long len
, unsigned long frag_off
, unsigned long frag_len
)
1093 s
->d1
->handshake_write_seq
= s
->d1
->next_handshake_write_seq
;
1094 s
->d1
->next_handshake_write_seq
++;
1097 dtls1_set_message_header_int(s
, mt
, len
, s
->d1
->handshake_write_seq
,
1098 frag_off
, frag_len
);
1100 return p
+= DTLS1_HM_HEADER_LENGTH
;
1104 /* don't actually do the writing, wait till the MTU has been retrieved */
1106 dtls1_set_message_header_int(SSL
*s
, unsigned char mt
,
1107 unsigned long len
, unsigned short seq_num
, unsigned long frag_off
,
1108 unsigned long frag_len
)
1110 struct hm_header_st
*msg_hdr
= &s
->d1
->w_msg_hdr
;
1113 msg_hdr
->msg_len
= len
;
1114 msg_hdr
->seq
= seq_num
;
1115 msg_hdr
->frag_off
= frag_off
;
1116 msg_hdr
->frag_len
= frag_len
;
1120 dtls1_fix_message_header(SSL
*s
, unsigned long frag_off
,
1121 unsigned long frag_len
)
1123 struct hm_header_st
*msg_hdr
= &s
->d1
->w_msg_hdr
;
1125 msg_hdr
->frag_off
= frag_off
;
1126 msg_hdr
->frag_len
= frag_len
;
1129 static unsigned char *
1130 dtls1_write_message_header(SSL
*s
, unsigned char *p
)
1132 struct hm_header_st
*msg_hdr
= &s
->d1
->w_msg_hdr
;
1134 *p
++ = msg_hdr
->type
;
1135 l2n3(msg_hdr
->msg_len
, p
);
1137 s2n(msg_hdr
->seq
, p
);
1138 l2n3(msg_hdr
->frag_off
, p
);
1139 l2n3(msg_hdr
->frag_len
, p
);
1147 return (g_probable_mtu
[(sizeof(g_probable_mtu
) /
1148 sizeof(g_probable_mtu
[0])) - 1]);
1152 dtls1_guess_mtu(unsigned int curr_mtu
)
1156 if ( curr_mtu
== 0 )
1157 return g_probable_mtu
[0] ;
1159 for ( i
= 0; i
< sizeof(g_probable_mtu
)/sizeof(g_probable_mtu
[0]); i
++)
1160 if ( curr_mtu
> g_probable_mtu
[i
])
1161 return g_probable_mtu
[i
];
1167 dtls1_get_message_header(unsigned char *data
, struct hm_header_st
*msg_hdr
)
1169 memset(msg_hdr
, 0x00, sizeof(struct hm_header_st
));
1170 msg_hdr
->type
= *(data
++);
1171 n2l3(data
, msg_hdr
->msg_len
);
1173 n2s(data
, msg_hdr
->seq
);
1174 n2l3(data
, msg_hdr
->frag_off
);
1175 n2l3(data
, msg_hdr
->frag_len
);
1179 dtls1_get_ccs_header(unsigned char *data
, struct ccs_header_st
*ccs_hdr
)
1181 memset(ccs_hdr
, 0x00, sizeof(struct ccs_header_st
));
1183 ccs_hdr
->type
= *(data
++);