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/evp.h>
121 #include <openssl/buffer.h>
122 #include <openssl/pqueue.h>
123 #include <openssl/rand.h>
125 /* mod 128 saturating subtract of two 64-bit values in big-endian order */
126 static int satsub64be(const unsigned char *v1,const unsigned char *v2)
129 if (sizeof(long) == 8) do
130 { const union { long one; char little; } is_endian = {1};
133 if (is_endian.little) break;
134 /* not reached on little-endians */
135 /* following test is redundant, because input is
136 * always aligned, but I take no chances... */
137 if (((size_t)v1|(size_t)v2)&0x7) break;
141 if (l>128) return 128;
142 else if (l<-128) return -128;
146 ret = (int)v1[7]-(int)v2[7];
148 brw = ret>>8; /* brw is either 0 or -1 */
151 { brw += (int)v1[i]-(int)v2[i];
158 { brw += (int)v1[i]-(int)v2[i];
163 brw <<= 8; /* brw is either 0 or -256 */
165 if (sat&0xff) return brw | 0x80;
166 else return brw + (ret&0xFF);
169 static int have_handshake_fragment(SSL *s, int type, unsigned char *buf,
171 static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap);
172 static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap);
173 static DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr,
174 unsigned int *is_next_epoch);
176 static int dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr,
177 unsigned short *priority, unsigned long *offset);
179 static int dtls1_buffer_record(SSL *s, record_pqueue *q,
180 unsigned char *priority);
181 static int dtls1_process_record(SSL *s);
182 static void dtls1_clear_timeouts(SSL *s);
184 /* copy buffered record into SSL structure */
186 dtls1_copy_record(SSL *s, pitem *item)
188 DTLS1_RECORD_DATA *rdata;
190 rdata = (DTLS1_RECORD_DATA *)item->data;
192 if (s->s3->rbuf.buf != NULL)
193 OPENSSL_free(s->s3->rbuf.buf);
195 s->packet = rdata->packet;
196 s->packet_length = rdata->packet_length;
197 memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
198 memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
200 /* Set proper sequence number for mac calculation */
201 memcpy(&(s->s3->read_sequence[2]), &(rdata->packet[5]), 6);
208 dtls1_buffer_record(SSL *s, record_pqueue *queue, unsigned char *priority)
210 DTLS1_RECORD_DATA *rdata;
213 /* Limit the size of the queue to prevent DOS attacks */
214 if (pqueue_size(queue->q) >= 100)
217 rdata = OPENSSL_malloc(sizeof(DTLS1_RECORD_DATA));
218 item = pitem_new(priority, rdata);
219 if (rdata == NULL || item == NULL)
221 if (rdata != NULL) OPENSSL_free(rdata);
222 if (item != NULL) pitem_free(item);
224 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
228 rdata->packet = s->packet;
229 rdata->packet_length = s->packet_length;
230 memcpy(&(rdata->rbuf), &(s->s3->rbuf), sizeof(SSL3_BUFFER));
231 memcpy(&(rdata->rrec), &(s->s3->rrec), sizeof(SSL3_RECORD));
235 #ifndef OPENSSL_NO_SCTP
236 /* Store bio_dgram_sctp_rcvinfo struct */
237 if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
238 (s->state == SSL3_ST_SR_FINISHED_A || s->state == SSL3_ST_CR_FINISHED_A)) {
239 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_GET_RCVINFO, sizeof(rdata->recordinfo), &rdata->recordinfo);
243 /* insert should not fail, since duplicates are dropped */
244 if (pqueue_insert(queue->q, item) == NULL)
252 s->packet_length = 0;
253 memset(&(s->s3->rbuf), 0, sizeof(SSL3_BUFFER));
254 memset(&(s->s3->rrec), 0, sizeof(SSL3_RECORD));
256 if (!ssl3_setup_buffers(s))
258 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
269 dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue)
273 item = pqueue_pop(queue->q);
276 dtls1_copy_record(s, item);
278 OPENSSL_free(item->data);
288 /* retrieve a buffered record that belongs to the new epoch, i.e., not processed
290 #define dtls1_get_unprocessed_record(s) \
291 dtls1_retrieve_buffered_record((s), \
292 &((s)->d1->unprocessed_rcds))
294 /* retrieve a buffered record that belongs to the current epoch, ie, processed */
295 #define dtls1_get_processed_record(s) \
296 dtls1_retrieve_buffered_record((s), \
297 &((s)->d1->processed_rcds))
300 dtls1_process_buffered_records(SSL *s)
304 item = pqueue_peek(s->d1->unprocessed_rcds.q);
307 /* Check if epoch is current. */
308 if (s->d1->unprocessed_rcds.epoch != s->d1->r_epoch)
309 return(1); /* Nothing to do. */
311 /* Process all the records. */
312 while (pqueue_peek(s->d1->unprocessed_rcds.q))
314 dtls1_get_unprocessed_record(s);
315 if ( ! dtls1_process_record(s))
317 dtls1_buffer_record(s, &(s->d1->processed_rcds),
318 s->s3->rrec.seq_num);
322 /* sync epoch numbers once all the unprocessed records
323 * have been processed */
324 s->d1->processed_rcds.epoch = s->d1->r_epoch;
325 s->d1->unprocessed_rcds.epoch = s->d1->r_epoch + 1;
334 dtls1_get_buffered_record(SSL *s)
338 (((PQ_64BIT)s->d1->handshake_read_seq) << 32) |
339 ((PQ_64BIT)s->d1->r_msg_hdr.frag_off);
341 if ( ! SSL_in_init(s)) /* if we're not (re)negotiating,
346 item = pqueue_peek(s->d1->rcvd_records);
347 if (item && item->priority == priority)
349 /* Check if we've received the record of interest. It must be
350 * a handshake record, since data records as passed up without
352 DTLS1_RECORD_DATA *rdata;
353 item = pqueue_pop(s->d1->rcvd_records);
354 rdata = (DTLS1_RECORD_DATA *)item->data;
356 if (s->s3->rbuf.buf != NULL)
357 OPENSSL_free(s->s3->rbuf.buf);
359 s->packet = rdata->packet;
360 s->packet_length = rdata->packet_length;
361 memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
362 memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
364 OPENSSL_free(item->data);
367 /* s->d1->next_expected_seq_num++; */
377 dtls1_process_record(SSL *s)
384 unsigned int mac_size;
385 unsigned char md[EVP_MAX_MD_SIZE];
386 int decryption_failed_or_bad_record_mac = 0;
387 unsigned char *mac = NULL;
393 /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
394 * and we have that many bytes in s->packet
396 rr->input= &(s->packet[DTLS1_RT_HEADER_LENGTH]);
398 /* ok, we can now read from 's->packet' data into 'rr'
399 * rr->input points at rr->length bytes, which
400 * need to be copied into rr->data by either
401 * the decryption or by the decompression
402 * When the data is 'copied' into the rr->data buffer,
403 * rr->input will be pointed at the new buffer */
405 /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
406 * rr->length bytes of encrypted compressed stuff. */
408 /* check is not needed I believe */
409 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
411 al=SSL_AD_RECORD_OVERFLOW;
412 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
416 /* decrypt in place in 'rr->input' */
419 enc_err = s->method->ssl3_enc->enc(s,0);
422 /* To minimize information leaked via timing, we will always
423 * perform all computations before discarding the message.
425 decryption_failed_or_bad_record_mac = 1;
429 printf("dec %d\n",rr->length);
430 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
434 /* r->length is now the compressed data plus mac */
435 if ( (sess == NULL) ||
436 (s->enc_read_ctx == NULL) ||
437 (s->read_hash == NULL))
442 /* !clear => s->read_hash != NULL => mac_size != -1 */
444 t=EVP_MD_CTX_size(s->read_hash);
445 OPENSSL_assert(t >= 0);
448 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+mac_size)
450 #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
451 al=SSL_AD_RECORD_OVERFLOW;
452 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
455 decryption_failed_or_bad_record_mac = 1;
458 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
459 if (rr->length >= mac_size)
461 rr->length -= mac_size;
462 mac = &rr->data[rr->length];
466 i=s->method->ssl3_enc->mac(s,md,0);
467 if (i < 0 || mac == NULL || memcmp(md, mac, mac_size) != 0)
469 decryption_failed_or_bad_record_mac = 1;
473 if (decryption_failed_or_bad_record_mac)
475 /* decryption failed, silently discard message */
477 s->packet_length = 0;
481 /* r->length is now just compressed */
482 if (s->expand != NULL)
484 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH)
486 al=SSL_AD_RECORD_OVERFLOW;
487 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
490 if (!ssl3_do_uncompress(s))
492 al=SSL_AD_DECOMPRESSION_FAILURE;
493 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_BAD_DECOMPRESSION);
498 if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH)
500 al=SSL_AD_RECORD_OVERFLOW;
501 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
506 /* So at this point the following is true
507 * ssl->s3->rrec.type is the type of record
508 * ssl->s3->rrec.length == number of bytes in record
509 * ssl->s3->rrec.off == offset to first valid byte
510 * ssl->s3->rrec.data == where to take bytes from, increment
514 /* we have pulled in a full packet so zero things */
516 dtls1_record_bitmap_update(s, &(s->d1->bitmap));/* Mark receipt of record. */
520 ssl3_send_alert(s,SSL3_AL_FATAL,al);
526 /* Call this to get a new input record.
527 * It will return <= 0 if more data is needed, normally due to an error
528 * or non-blocking IO.
529 * When it finishes, one packet has been decoded and can be found in
530 * ssl->s3->rrec.type - is the type of record
531 * ssl->s3->rrec.data, - data
532 * ssl->s3->rrec.length, - number of bytes
534 /* used only by dtls1_read_bytes */
535 int dtls1_get_record(SSL *s)
537 int ssl_major,ssl_minor;
540 unsigned char *p = NULL;
541 unsigned short version;
542 DTLS1_BITMAP *bitmap;
543 unsigned int is_next_epoch;
547 /* The epoch may have changed. If so, process all the
548 * pending records. This is a non-blocking operation. */
549 dtls1_process_buffered_records(s);
551 /* if we're renegotiating, then there may be buffered records */
552 if (dtls1_get_processed_record(s))
555 /* get something from the wire */
557 /* check if we have the header */
558 if ( (s->rstate != SSL_ST_READ_BODY) ||
559 (s->packet_length < DTLS1_RT_HEADER_LENGTH))
561 n=ssl3_read_n(s, DTLS1_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
562 /* read timeout is handled by dtls1_read_bytes */
563 if (n <= 0) return(n); /* error or non-blocking */
565 /* this packet contained a partial record, dump it */
566 if (s->packet_length != DTLS1_RT_HEADER_LENGTH)
568 s->packet_length = 0;
572 s->rstate=SSL_ST_READ_BODY;
576 /* Pull apart the header into the DTLS1_RECORD */
580 version=(ssl_major<<8)|ssl_minor;
582 /* sequence number is 64 bits, with top 2 bytes = epoch */
585 memcpy(&(s->s3->read_sequence[2]), p, 6);
590 /* Lets check version */
591 if (!s->first_packet)
593 if (version != s->version)
595 /* unexpected version, silently discard */
597 s->packet_length = 0;
602 if ((version & 0xff00) != (s->version & 0xff00))
604 /* wrong version, silently discard record */
606 s->packet_length = 0;
610 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
612 /* record too long, silently discard it */
614 s->packet_length = 0;
618 /* now s->rstate == SSL_ST_READ_BODY */
621 /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
623 if (rr->length > s->packet_length-DTLS1_RT_HEADER_LENGTH)
625 /* now s->packet_length == DTLS1_RT_HEADER_LENGTH */
627 n=ssl3_read_n(s,i,i,1);
628 if (n <= 0) return(n); /* error or non-blocking io */
630 /* this packet contained a partial record, dump it */
634 s->packet_length = 0;
638 /* now n == rr->length,
639 * and s->packet_length == DTLS1_RT_HEADER_LENGTH + rr->length */
641 s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
643 /* match epochs. NULL means the packet is dropped on the floor */
644 bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch);
648 s->packet_length = 0; /* dump this record */
649 goto again; /* get another record */
652 #ifndef OPENSSL_NO_SCTP
653 /* Only do replay check if no SCTP bio */
654 if (!BIO_dgram_is_sctp(SSL_get_rbio(s)))
657 /* Check whether this is a repeat, or aged record.
658 * Don't check if we're listening and this message is
659 * a ClientHello. They can look as if they're replayed,
660 * since they arrive from different connections and
661 * would be dropped unnecessarily.
663 if (!(s->d1->listen && rr->type == SSL3_RT_HANDSHAKE &&
664 *p == SSL3_MT_CLIENT_HELLO) &&
665 !dtls1_record_replay_check(s, bitmap))
668 s->packet_length=0; /* dump this record */
669 goto again; /* get another record */
671 #ifndef OPENSSL_NO_SCTP
675 /* just read a 0 length packet */
676 if (rr->length == 0) goto again;
678 /* If this record is from the next epoch (either HM or ALERT),
679 * and a handshake is currently in progress, buffer it since it
680 * cannot be processed at this time. However, do not buffer
681 * anything while listening.
685 if ((SSL_in_init(s) || s->in_handshake) && !s->d1->listen)
687 dtls1_buffer_record(s, &(s->d1->unprocessed_rcds), rr->seq_num);
690 s->packet_length = 0;
694 if (!dtls1_process_record(s))
697 s->packet_length = 0; /* dump this record */
698 goto again; /* get another record */
701 dtls1_clear_timeouts(s); /* done waiting */
706 /* Return up to 'len' payload bytes received in 'type' records.
707 * 'type' is one of the following:
709 * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
710 * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
711 * - 0 (during a shutdown, no data has to be returned)
713 * If we don't have stored data to work from, read a SSL/TLS record first
714 * (possibly multiple records if we still don't have anything to return).
716 * This function must handle any surprises the peer may have for us, such as
717 * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
718 * a surprise, but handled as if it were), or renegotiation requests.
719 * Also if record payloads contain fragments too small to process, we store
720 * them until there is enough for the respective protocol (the record protocol
721 * may use arbitrary fragmentation and even interleaving):
722 * Change cipher spec protocol
723 * just 1 byte needed, no need for keeping anything stored
725 * 2 bytes needed (AlertLevel, AlertDescription)
727 * 4 bytes needed (HandshakeType, uint24 length) -- we just have
728 * to detect unexpected Client Hello and Hello Request messages
729 * here, anything else is handled by higher layers
730 * Application data protocol
731 * none of our business
733 int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
738 void (*cb)(const SSL *ssl,int type2,int val)=NULL;
740 if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
741 if (!ssl3_setup_buffers(s))
744 /* XXX: check what the second '&& type' is about */
745 if ((type && (type != SSL3_RT_APPLICATION_DATA) &&
746 (type != SSL3_RT_HANDSHAKE) && type) ||
747 (peek && (type != SSL3_RT_APPLICATION_DATA)))
749 SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
753 /* check whether there's a handshake message (client hello?) waiting */
754 if ( (ret = have_handshake_fragment(s, type, buf, len, peek)))
757 /* Now s->d1->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
759 #ifndef OPENSSL_NO_SCTP
760 /* Continue handshake if it had to be interrupted to read
761 * app data with SCTP.
763 if ((!s->in_handshake && SSL_in_init(s)) ||
764 (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
765 (s->state == DTLS1_SCTP_ST_SR_READ_SOCK || s->state == DTLS1_SCTP_ST_CR_READ_SOCK) &&
766 s->s3->in_read_app_data != 2))
768 if (!s->in_handshake && SSL_in_init(s))
771 /* type == SSL3_RT_APPLICATION_DATA */
772 i=s->handshake_func(s);
773 if (i < 0) return(i);
776 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
782 s->rwstate=SSL_NOTHING;
784 /* s->s3->rrec.type - is the type of record
785 * s->s3->rrec.data, - data
786 * s->s3->rrec.off, - offset into 'data' for next read
787 * s->s3->rrec.length, - number of bytes. */
790 /* We are not handshaking and have no data yet,
791 * so process data buffered during the last handshake
792 * in advance, if any.
794 if (s->state == SSL_ST_OK && rr->length == 0)
797 item = pqueue_pop(s->d1->buffered_app_data.q);
800 #ifndef OPENSSL_NO_SCTP
801 /* Restore bio_dgram_sctp_rcvinfo struct */
802 if (BIO_dgram_is_sctp(SSL_get_rbio(s)))
804 DTLS1_RECORD_DATA *rdata = (DTLS1_RECORD_DATA *) item->data;
805 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_SET_RCVINFO, sizeof(rdata->recordinfo), &rdata->recordinfo);
809 dtls1_copy_record(s, item);
811 OPENSSL_free(item->data);
816 /* Check for timeout */
817 if (dtls1_handle_timeout(s) > 0)
820 /* get new packet if necessary */
821 if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
823 ret=dtls1_get_record(s);
826 ret = dtls1_read_failed(s, ret);
827 /* anything other than a timeout is an error */
835 /* we now have a packet which can be read and processed */
837 if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
838 * reset by ssl3_get_finished */
839 && (rr->type != SSL3_RT_HANDSHAKE))
841 /* We now have application data between CCS and Finished.
842 * Most likely the packets were reordered on their way, so
843 * buffer the application data for later processing rather
844 * than dropping the connection.
846 dtls1_buffer_record(s, &(s->d1->buffered_app_data), rr->seq_num);
851 /* If the other end has shut down, throw anything we read away
852 * (even in 'peek' mode) */
853 if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
856 s->rwstate=SSL_NOTHING;
861 if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
863 /* make sure that we are not getting application data when we
864 * are doing a handshake for the first time */
865 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
866 (s->enc_read_ctx == NULL))
868 al=SSL_AD_UNEXPECTED_MESSAGE;
869 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
873 if (len <= 0) return(len);
875 if ((unsigned int)len > rr->length)
878 n = (unsigned int)len;
880 memcpy(buf,&(rr->data[rr->off]),n);
887 s->rstate=SSL_ST_READ_HEADER;
892 #ifndef OPENSSL_NO_SCTP
893 /* We were about to renegotiate but had to read
894 * belated application data first, so retry.
896 if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
897 rr->type == SSL3_RT_APPLICATION_DATA &&
898 (s->state == DTLS1_SCTP_ST_SR_READ_SOCK || s->state == DTLS1_SCTP_ST_CR_READ_SOCK))
900 s->rwstate=SSL_READING;
901 BIO_clear_retry_flags(SSL_get_rbio(s));
902 BIO_set_retry_read(SSL_get_rbio(s));
905 /* We might had to delay a close_notify alert because
906 * of reordered app data. If there was an alert and there
907 * is no message to read anymore, finally set shutdown.
909 if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
910 s->d1->shutdown_received && !BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
912 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
920 /* If we get here, then type != rr->type; if we have a handshake
921 * message, then it was unexpected (Hello Request or Client Hello). */
923 /* In case of record types for which we have 'fragment' storage,
924 * fill that so that we can process the data at a fixed place.
927 unsigned int k, dest_maxlen = 0;
928 unsigned char *dest = NULL;
929 unsigned int *dest_len = NULL;
931 if (rr->type == SSL3_RT_HANDSHAKE)
933 dest_maxlen = sizeof s->d1->handshake_fragment;
934 dest = s->d1->handshake_fragment;
935 dest_len = &s->d1->handshake_fragment_len;
937 else if (rr->type == SSL3_RT_ALERT)
939 dest_maxlen = sizeof(s->d1->alert_fragment);
940 dest = s->d1->alert_fragment;
941 dest_len = &s->d1->alert_fragment_len;
943 #ifndef OPENSSL_NO_HEARTBEATS
944 else if (rr->type == TLS1_RT_HEARTBEAT)
946 dtls1_process_heartbeat(s);
948 /* Exit and notify application to read again */
950 s->rwstate=SSL_READING;
951 BIO_clear_retry_flags(SSL_get_rbio(s));
952 BIO_set_retry_read(SSL_get_rbio(s));
956 /* else it's a CCS message, or application data or wrong */
957 else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC)
959 /* Application data while renegotiating
960 * is allowed. Try again reading.
962 if (rr->type == SSL3_RT_APPLICATION_DATA)
965 s->s3->in_read_app_data=2;
967 s->rwstate=SSL_READING;
968 BIO_clear_retry_flags(bio);
969 BIO_set_retry_read(bio);
973 /* Not certain if this is the right error handling */
974 al=SSL_AD_UNEXPECTED_MESSAGE;
975 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
981 /* XDTLS: In a pathalogical case, the Client Hello
982 * may be fragmented--don't always expect dest_maxlen bytes */
983 if ( rr->length < dest_maxlen)
985 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
987 * for normal alerts rr->length is 2, while
988 * dest_maxlen is 7 if we were to handle this
989 * non-existing alert...
993 s->rstate=SSL_ST_READ_HEADER;
998 /* now move 'n' bytes: */
999 for ( k = 0; k < dest_maxlen; k++)
1001 dest[k] = rr->data[rr->off++];
1004 *dest_len = dest_maxlen;
1008 /* s->d1->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE;
1009 * s->d1->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT.
1010 * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
1012 /* If we are a client, check for an incoming 'Hello Request': */
1014 (s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
1015 (s->d1->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
1016 (s->session != NULL) && (s->session->cipher != NULL))
1018 s->d1->handshake_fragment_len = 0;
1020 if ((s->d1->handshake_fragment[1] != 0) ||
1021 (s->d1->handshake_fragment[2] != 0) ||
1022 (s->d1->handshake_fragment[3] != 0))
1024 al=SSL_AD_DECODE_ERROR;
1025 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
1029 /* no need to check sequence number on HELLO REQUEST messages */
1031 if (s->msg_callback)
1032 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
1033 s->d1->handshake_fragment, 4, s, s->msg_callback_arg);
1035 if (SSL_is_init_finished(s) &&
1036 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
1037 !s->s3->renegotiate)
1040 ssl3_renegotiate(s);
1041 if (ssl3_renegotiate_check(s))
1043 i=s->handshake_func(s);
1044 if (i < 0) return(i);
1047 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1051 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1053 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1056 /* In the case where we try to read application data,
1057 * but we trigger an SSL handshake, we return -1 with
1058 * the retry option set. Otherwise renegotiation may
1059 * cause nasty problems in the blocking world */
1060 s->rwstate=SSL_READING;
1061 bio=SSL_get_rbio(s);
1062 BIO_clear_retry_flags(bio);
1063 BIO_set_retry_read(bio);
1069 /* we either finished a handshake or ignored the request,
1070 * now try again to obtain the (application) data we were asked for */
1074 if (s->d1->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH)
1076 int alert_level = s->d1->alert_fragment[0];
1077 int alert_descr = s->d1->alert_fragment[1];
1079 s->d1->alert_fragment_len = 0;
1081 if (s->msg_callback)
1082 s->msg_callback(0, s->version, SSL3_RT_ALERT,
1083 s->d1->alert_fragment, 2, s, s->msg_callback_arg);
1085 if (s->info_callback != NULL)
1086 cb=s->info_callback;
1087 else if (s->ctx->info_callback != NULL)
1088 cb=s->ctx->info_callback;
1092 j = (alert_level << 8) | alert_descr;
1093 cb(s, SSL_CB_READ_ALERT, j);
1096 if (alert_level == 1) /* warning */
1098 s->s3->warn_alert = alert_descr;
1099 if (alert_descr == SSL_AD_CLOSE_NOTIFY)
1101 #ifndef OPENSSL_NO_SCTP
1102 /* With SCTP and streams the socket may deliver app data
1103 * after a close_notify alert. We have to check this
1104 * first so that nothing gets discarded.
1106 if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
1107 BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
1109 s->d1->shutdown_received = 1;
1110 s->rwstate=SSL_READING;
1111 BIO_clear_retry_flags(SSL_get_rbio(s));
1112 BIO_set_retry_read(SSL_get_rbio(s));
1116 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
1120 /* XXX: this is a possible improvement in the future */
1121 /* now check if it's a missing record */
1122 if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
1125 unsigned int frag_off;
1126 unsigned char *p = &(s->d1->alert_fragment[2]);
1131 dtls1_retransmit_message(s,
1132 dtls1_get_queue_priority(frag->msg_header.seq, 0),
1134 if ( ! found && SSL_in_init(s))
1136 /* fprintf( stderr,"in init = %d\n", SSL_in_init(s)); */
1137 /* requested a message not yet sent,
1138 send an alert ourselves */
1139 ssl3_send_alert(s,SSL3_AL_WARNING,
1140 DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
1145 else if (alert_level == 2) /* fatal */
1149 s->rwstate=SSL_NOTHING;
1150 s->s3->fatal_alert = alert_descr;
1151 SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1152 BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1153 ERR_add_error_data(2,"SSL alert number ",tmp);
1154 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1155 SSL_CTX_remove_session(s->ctx,s->session);
1160 al=SSL_AD_ILLEGAL_PARAMETER;
1161 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1168 if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1170 s->rwstate=SSL_NOTHING;
1175 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1177 struct ccs_header_st ccs_hdr;
1178 unsigned int ccs_hdr_len = DTLS1_CCS_HEADER_LENGTH;
1180 dtls1_get_ccs_header(rr->data, &ccs_hdr);
1182 if (s->version == DTLS1_BAD_VER)
1185 /* 'Change Cipher Spec' is just a single byte, so we know
1186 * exactly what the record payload has to look like */
1187 /* XDTLS: check that epoch is consistent */
1188 if ( (rr->length != ccs_hdr_len) ||
1189 (rr->off != 0) || (rr->data[0] != SSL3_MT_CCS))
1191 i=SSL_AD_ILLEGAL_PARAMETER;
1192 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1198 if (s->msg_callback)
1199 s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,
1200 rr->data, 1, s, s->msg_callback_arg);
1202 /* We can't process a CCS now, because previous handshake
1203 * messages are still missing, so just drop it.
1205 if (!s->d1->change_cipher_spec_ok)
1210 s->d1->change_cipher_spec_ok = 0;
1212 s->s3->change_cipher_spec=1;
1213 if (!ssl3_do_change_cipher_spec(s))
1216 /* do this whenever CCS is processed */
1217 dtls1_reset_seq_numbers(s, SSL3_CC_READ);
1219 if (s->version == DTLS1_BAD_VER)
1220 s->d1->handshake_read_seq++;
1222 #ifndef OPENSSL_NO_SCTP
1223 /* Remember that a CCS has been received,
1224 * so that an old key of SCTP-Auth can be
1225 * deleted when a CCS is sent. Will be ignored
1226 * if no SCTP is used
1228 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD, 1, NULL);
1234 /* Unexpected handshake message (Client Hello, or protocol violation) */
1235 if ((s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
1238 struct hm_header_st msg_hdr;
1240 /* this may just be a stale retransmit */
1241 dtls1_get_message_header(rr->data, &msg_hdr);
1242 if( rr->epoch != s->d1->r_epoch)
1248 /* If we are server, we may have a repeated FINISHED of the
1249 * client here, then retransmit our CCS and FINISHED.
1251 if (msg_hdr.type == SSL3_MT_FINISHED)
1253 dtls1_retransmit_buffered_messages(s);
1258 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1259 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1261 #if 0 /* worked only because C operator preferences are not as expected (and
1262 * because this is not really needed for clients except for detecting
1263 * protocol violations): */
1264 s->state=SSL_ST_BEFORE|(s->server)
1268 s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1273 i=s->handshake_func(s);
1274 if (i < 0) return(i);
1277 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1281 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1283 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1286 /* In the case where we try to read application data,
1287 * but we trigger an SSL handshake, we return -1 with
1288 * the retry option set. Otherwise renegotiation may
1289 * cause nasty problems in the blocking world */
1290 s->rwstate=SSL_READING;
1291 bio=SSL_get_rbio(s);
1292 BIO_clear_retry_flags(bio);
1293 BIO_set_retry_read(bio);
1303 #ifndef OPENSSL_NO_TLS
1304 /* TLS just ignores unknown message types */
1305 if (s->version == TLS1_VERSION)
1311 al=SSL_AD_UNEXPECTED_MESSAGE;
1312 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1314 case SSL3_RT_CHANGE_CIPHER_SPEC:
1316 case SSL3_RT_HANDSHAKE:
1317 /* we already handled all of these, with the possible exception
1318 * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1319 * should not happen when type != rr->type */
1320 al=SSL_AD_UNEXPECTED_MESSAGE;
1321 SSLerr(SSL_F_DTLS1_READ_BYTES,ERR_R_INTERNAL_ERROR);
1323 case SSL3_RT_APPLICATION_DATA:
1324 /* At this point, we were expecting handshake data,
1325 * but have application data. If the library was
1326 * running inside ssl3_read() (i.e. in_read_app_data
1327 * is set) and it makes sense to read application data
1328 * at this point (session renegotiation not yet started),
1329 * we will indulge it.
1331 if (s->s3->in_read_app_data &&
1332 (s->s3->total_renegotiations != 0) &&
1334 (s->state & SSL_ST_CONNECT) &&
1335 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1336 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1338 (s->state & SSL_ST_ACCEPT) &&
1339 (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1340 (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1344 s->s3->in_read_app_data=2;
1349 al=SSL_AD_UNEXPECTED_MESSAGE;
1350 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1357 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1363 dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len)
1367 #ifndef OPENSSL_NO_SCTP
1368 /* Check if we have to continue an interrupted handshake
1369 * for reading belated app data with SCTP.
1371 if ((SSL_in_init(s) && !s->in_handshake) ||
1372 (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
1373 (s->state == DTLS1_SCTP_ST_SR_READ_SOCK || s->state == DTLS1_SCTP_ST_CR_READ_SOCK)))
1375 if (SSL_in_init(s) && !s->in_handshake)
1378 i=s->handshake_func(s);
1379 if (i < 0) return(i);
1382 SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1387 if (len > SSL3_RT_MAX_PLAIN_LENGTH)
1389 SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_DTLS_MESSAGE_TOO_BIG);
1393 i = dtls1_write_bytes(s, type, buf_, len);
1398 /* this only happens when a client hello is received and a handshake
1401 have_handshake_fragment(SSL *s, int type, unsigned char *buf,
1405 if ((type == SSL3_RT_HANDSHAKE) && (s->d1->handshake_fragment_len > 0))
1406 /* (partially) satisfy request from storage */
1408 unsigned char *src = s->d1->handshake_fragment;
1409 unsigned char *dst = buf;
1414 while ((len > 0) && (s->d1->handshake_fragment_len > 0))
1417 len--; s->d1->handshake_fragment_len--;
1420 /* move any remaining fragment bytes: */
1421 for (k = 0; k < s->d1->handshake_fragment_len; k++)
1422 s->d1->handshake_fragment[k] = *src++;
1432 /* Call this to write data in records of type 'type'
1433 * It will return <= 0 if not all data has been sent or non-blocking IO.
1435 int dtls1_write_bytes(SSL *s, int type, const void *buf, int len)
1439 OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH);
1440 s->rwstate=SSL_NOTHING;
1441 i=do_dtls1_write(s, type, buf, len, 0);
1445 int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len, int create_empty_fragment)
1447 unsigned char *p,*pseq;
1448 int i,mac_size,clear=0;
1455 /* first check if there is a SSL3_BUFFER still being written
1456 * out. This will happen with non blocking IO */
1457 if (s->s3->wbuf.left != 0)
1459 OPENSSL_assert(0); /* XDTLS: want to see if we ever get here */
1460 return(ssl3_write_pending(s,type,buf,len));
1463 /* If we have an alert to send, lets send it */
1464 if (s->s3->alert_dispatch)
1466 i=s->method->ssl_dispatch_alert(s);
1469 /* if it went, fall through and send more stuff */
1472 if (len == 0 && !create_empty_fragment)
1479 if ( (sess == NULL) ||
1480 (s->enc_write_ctx == NULL) ||
1481 (EVP_MD_CTX_md(s->write_hash) == NULL))
1488 mac_size=EVP_MD_CTX_size(s->write_hash);
1493 /* DTLS implements explicit IV, so no need for empty fragments */
1495 /* 'create_empty_fragment' is true only when this function calls itself */
1496 if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done
1497 && SSL_version(s) != DTLS1_VERSION && SSL_version(s) != DTLS1_BAD_VER)
1499 /* countermeasure against known-IV weakness in CBC ciphersuites
1500 * (see http://www.openssl.org/~bodo/tls-cbc.txt)
1503 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
1505 /* recursive function call with 'create_empty_fragment' set;
1506 * this prepares and buffers the data for an empty fragment
1507 * (these 'prefix_len' bytes are sent out later
1508 * together with the actual payload) */
1509 prefix_len = s->method->do_ssl_write(s, type, buf, 0, 1);
1510 if (prefix_len <= 0)
1513 if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE)
1515 /* insufficient space */
1516 SSLerr(SSL_F_DO_DTLS1_WRITE, ERR_R_INTERNAL_ERROR);
1521 s->s3->empty_fragment_done = 1;
1524 p = wb->buf + prefix_len;
1526 /* write the header */
1531 *(p++)=(s->version>>8);
1532 *(p++)=s->version&0xff;
1534 /* field where we are to write out packet epoch, seq num and len */
1538 /* lets setup the record stuff. */
1540 /* Make space for the explicit IV in case of CBC.
1541 * (this is a bit of a boundary violation, but what the heck).
1543 if ( s->enc_write_ctx &&
1544 (EVP_CIPHER_mode( s->enc_write_ctx->cipher ) & EVP_CIPH_CBC_MODE))
1545 bs = EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
1549 wr->data=p + bs; /* make room for IV in case of CBC */
1550 wr->length=(int)len;
1551 wr->input=(unsigned char *)buf;
1553 /* we now 'read' from wr->input, wr->length bytes into
1556 /* first we compress */
1557 if (s->compress != NULL)
1559 if (!ssl3_do_compress(s))
1561 SSLerr(SSL_F_DO_DTLS1_WRITE,SSL_R_COMPRESSION_FAILURE);
1567 memcpy(wr->data,wr->input,wr->length);
1571 /* we should still have the output to wr->data and the input
1572 * from wr->input. Length should be wr->length.
1573 * wr->data still points in the wb->buf */
1577 if(s->method->ssl3_enc->mac(s,&(p[wr->length + bs]),1) < 0)
1579 wr->length+=mac_size;
1582 /* this is true regardless of mac size */
1587 /* ssl3_enc can only have an error on read */
1588 if (bs) /* bs != 0 in case of CBC */
1590 RAND_pseudo_bytes(p,bs);
1591 /* master IV and last CBC residue stand for
1592 * the rest of randomness */
1596 s->method->ssl3_enc->enc(s,1);
1598 /* record length after mac and block padding */
1599 /* if (type == SSL3_RT_APPLICATION_DATA ||
1600 (type == SSL3_RT_ALERT && ! SSL_in_init(s))) */
1602 /* there's only one epoch between handshake and app data */
1604 s2n(s->d1->w_epoch, pseq);
1608 s2n(s->d1->handshake_epoch, pseq); */
1610 memcpy(pseq, &(s->s3->write_sequence[2]), 6);
1612 s2n(wr->length,pseq);
1614 /* we should now have
1615 * wr->data pointing to the encrypted data, which is
1616 * wr->length long */
1617 wr->type=type; /* not needed but helps for debugging */
1618 wr->length+=DTLS1_RT_HEADER_LENGTH;
1620 #if 0 /* this is now done at the message layer */
1621 /* buffer the record, making it easy to handle retransmits */
1622 if ( type == SSL3_RT_HANDSHAKE || type == SSL3_RT_CHANGE_CIPHER_SPEC)
1623 dtls1_buffer_record(s, wr->data, wr->length,
1624 *((PQ_64BIT *)&(s->s3->write_sequence[0])));
1627 ssl3_record_sequence_update(&(s->s3->write_sequence[0]));
1629 if (create_empty_fragment)
1631 /* we are in a recursive call;
1632 * just return the length, don't write out anything here
1637 /* now let's set up wb */
1638 wb->left = prefix_len + wr->length;
1641 /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
1642 s->s3->wpend_tot=len;
1643 s->s3->wpend_buf=buf;
1644 s->s3->wpend_type=type;
1645 s->s3->wpend_ret=len;
1647 /* we now just need to write the buffer */
1648 return ssl3_write_pending(s,type,buf,len);
1655 static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap)
1659 const unsigned char *seq = s->s3->read_sequence;
1661 cmp = satsub64be(seq,bitmap->max_seq_num);
1664 memcpy (s->s3->rrec.seq_num,seq,8);
1665 return 1; /* this record in new */
1668 if (shift >= sizeof(bitmap->map)*8)
1669 return 0; /* stale, outside the window */
1670 else if (bitmap->map & (1UL<<shift))
1671 return 0; /* record previously received */
1673 memcpy (s->s3->rrec.seq_num,seq,8);
1678 static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap)
1682 const unsigned char *seq = s->s3->read_sequence;
1684 cmp = satsub64be(seq,bitmap->max_seq_num);
1688 if (shift < sizeof(bitmap->map)*8)
1689 bitmap->map <<= shift, bitmap->map |= 1UL;
1692 memcpy(bitmap->max_seq_num,seq,8);
1696 if (shift < sizeof(bitmap->map)*8)
1697 bitmap->map |= 1UL<<shift;
1702 int dtls1_dispatch_alert(SSL *s)
1705 void (*cb)(const SSL *ssl,int type,int val)=NULL;
1706 unsigned char buf[DTLS1_AL_HEADER_LENGTH];
1707 unsigned char *ptr = &buf[0];
1709 s->s3->alert_dispatch=0;
1711 memset(buf, 0x00, sizeof(buf));
1712 *ptr++ = s->s3->send_alert[0];
1713 *ptr++ = s->s3->send_alert[1];
1715 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1716 if (s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
1718 s2n(s->d1->handshake_read_seq, ptr);
1720 if ( s->d1->r_msg_hdr.frag_off == 0) /* waiting for a new msg */
1723 s2n(s->d1->r_msg_hdr.seq, ptr); /* partial msg read */
1727 fprintf(stderr, "s->d1->handshake_read_seq = %d, s->d1->r_msg_hdr.seq = %d\n",s->d1->handshake_read_seq,s->d1->r_msg_hdr.seq);
1729 l2n3(s->d1->r_msg_hdr.frag_off, ptr);
1733 i = do_dtls1_write(s, SSL3_RT_ALERT, &buf[0], sizeof(buf), 0);
1736 s->s3->alert_dispatch=1;
1737 /* fprintf( stderr, "not done with alert\n" ); */
1741 if (s->s3->send_alert[0] == SSL3_AL_FATAL
1742 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1743 || s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1746 (void)BIO_flush(s->wbio);
1748 if (s->msg_callback)
1749 s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert,
1750 2, s, s->msg_callback_arg);
1752 if (s->info_callback != NULL)
1753 cb=s->info_callback;
1754 else if (s->ctx->info_callback != NULL)
1755 cb=s->ctx->info_callback;
1759 j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1760 cb(s,SSL_CB_WRITE_ALERT,j);
1767 static DTLS1_BITMAP *
1768 dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, unsigned int *is_next_epoch)
1773 /* In current epoch, accept HM, CCS, DATA, & ALERT */
1774 if (rr->epoch == s->d1->r_epoch)
1775 return &s->d1->bitmap;
1777 /* Only HM and ALERT messages can be from the next epoch */
1778 else if (rr->epoch == (unsigned long)(s->d1->r_epoch + 1) &&
1779 (rr->type == SSL3_RT_HANDSHAKE ||
1780 rr->type == SSL3_RT_ALERT))
1783 return &s->d1->next_bitmap;
1791 dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, unsigned short *priority,
1792 unsigned long *offset)
1795 /* alerts are passed up immediately */
1796 if ( rr->type == SSL3_RT_APPLICATION_DATA ||
1797 rr->type == SSL3_RT_ALERT)
1800 /* Only need to buffer if a handshake is underway.
1801 * (this implies that Hello Request and Client Hello are passed up
1803 if ( SSL_in_init(s))
1805 unsigned char *data = rr->data;
1806 /* need to extract the HM/CCS sequence number here */
1807 if ( rr->type == SSL3_RT_HANDSHAKE ||
1808 rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1810 unsigned short seq_num;
1811 struct hm_header_st msg_hdr;
1812 struct ccs_header_st ccs_hdr;
1814 if ( rr->type == SSL3_RT_HANDSHAKE)
1816 dtls1_get_message_header(data, &msg_hdr);
1817 seq_num = msg_hdr.seq;
1818 *offset = msg_hdr.frag_off;
1822 dtls1_get_ccs_header(data, &ccs_hdr);
1823 seq_num = ccs_hdr.seq;
1827 /* this is either a record we're waiting for, or a
1828 * retransmit of something we happened to previously
1829 * receive (higher layers will drop the repeat silently */
1830 if ( seq_num < s->d1->handshake_read_seq)
1832 if (rr->type == SSL3_RT_HANDSHAKE &&
1833 seq_num == s->d1->handshake_read_seq &&
1834 msg_hdr.frag_off < s->d1->r_msg_hdr.frag_off)
1836 else if ( seq_num == s->d1->handshake_read_seq &&
1837 (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC ||
1838 msg_hdr.frag_off == s->d1->r_msg_hdr.frag_off))
1842 *priority = seq_num;
1846 else /* unknown record type */
1855 dtls1_reset_seq_numbers(SSL *s, int rw)
1858 unsigned int seq_bytes = sizeof(s->s3->read_sequence);
1860 if ( rw & SSL3_CC_READ)
1862 seq = s->s3->read_sequence;
1864 memcpy(&(s->d1->bitmap), &(s->d1->next_bitmap), sizeof(DTLS1_BITMAP));
1865 memset(&(s->d1->next_bitmap), 0x00, sizeof(DTLS1_BITMAP));
1869 seq = s->s3->write_sequence;
1870 memcpy(s->d1->last_write_sequence, seq, sizeof(s->s3->write_sequence));
1874 memset(seq, 0x00, seq_bytes);
1879 dtls1_clear_timeouts(SSL *s)
1881 memset(&(s->d1->timeout), 0x00, sizeof(struct dtls1_timeout_st));