2 Unix SMB/CIFS implementation.
4 Copyright (C) Jeremy Allison 2003.
5 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 /* Lookup a packet's MID (multiplex id) and figure out it's sequence number */
25 struct outstanding_packet_lookup
{
26 struct outstanding_packet_lookup
*prev
, *next
;
31 struct smb_basic_signing_context
{
34 struct outstanding_packet_lookup
*outstanding_packet_list
;
37 static BOOL
store_sequence_for_reply(struct outstanding_packet_lookup
**list
,
38 uint16 mid
, uint32 reply_seq_num
)
40 struct outstanding_packet_lookup
*t
;
42 /* Ensure we only add a mid once. */
43 for (t
= *list
; t
; t
= t
->next
) {
45 DLIST_REMOVE(*list
, t
);
51 t
= SMB_XMALLOC_P(struct outstanding_packet_lookup
);
55 t
->reply_seq_num
= reply_seq_num
;
58 * Add to the *start* of the list not the end of the list.
59 * This ensures that the *last* send sequence with this mid
60 * is returned by preference.
61 * This can happen if the mid wraps and one of the early
62 * mid numbers didn't get a reply and is still lurking on
63 * the list. JRA. Found by Fran Fabrizio <fran@cis.uab.edu>.
67 DEBUG(10,("store_sequence_for_reply: stored seq = %u mid = %u\n",
68 (unsigned int)reply_seq_num
, (unsigned int)mid
));
72 static BOOL
get_sequence_for_reply(struct outstanding_packet_lookup
**list
,
73 uint16 mid
, uint32
*reply_seq_num
)
75 struct outstanding_packet_lookup
*t
;
77 for (t
= *list
; t
; t
= t
->next
) {
79 *reply_seq_num
= t
->reply_seq_num
;
80 DEBUG(10,("get_sequence_for_reply: found seq = %u mid = %u\n",
81 (unsigned int)t
->reply_seq_num
, (unsigned int)t
->mid
));
82 DLIST_REMOVE(*list
, t
);
90 /***********************************************************
91 SMB signing - Common code before we set a new signing implementation
92 ************************************************************/
94 static BOOL
cli_set_smb_signing_common(struct cli_state
*cli
)
96 if (!cli
->sign_info
.allow_smb_signing
) {
100 if (!cli
->sign_info
.negotiated_smb_signing
101 && !cli
->sign_info
.mandatory_signing
) {
105 if (cli
->sign_info
.doing_signing
) {
109 if (cli
->sign_info
.free_signing_context
)
110 cli
->sign_info
.free_signing_context(&cli
->sign_info
);
112 /* These calls are INCOMPATIBLE with SMB signing */
113 cli
->readbraw_supported
= False
;
114 cli
->writebraw_supported
= False
;
119 /***********************************************************
120 SMB signing - Common code for 'real' implementations
121 ************************************************************/
123 static BOOL
set_smb_signing_real_common(struct smb_sign_info
*si
)
125 if (si
->mandatory_signing
) {
126 DEBUG(5, ("Mandatory SMB signing enabled!\n"));
129 si
->doing_signing
= True
;
130 DEBUG(5, ("SMB signing enabled!\n"));
135 static void mark_packet_signed(char *outbuf
)
138 flags2
= SVAL(outbuf
,smb_flg2
);
139 flags2
|= FLAGS2_SMB_SECURITY_SIGNATURES
;
140 SSVAL(outbuf
,smb_flg2
, flags2
);
143 /***********************************************************
144 SMB signing - NULL implementation - calculate a MAC to send.
145 ************************************************************/
147 static void null_sign_outgoing_message(char *outbuf
, struct smb_sign_info
*si
)
149 /* we can't zero out the sig, as we might be trying to send a
150 session request - which is NBT-level, not SMB level and doesn't
155 /***********************************************************
156 SMB signing - NULL implementation - check a MAC sent by server.
157 ************************************************************/
159 static BOOL
null_check_incoming_message(char *inbuf
, struct smb_sign_info
*si
, BOOL must_be_ok
)
164 /***********************************************************
165 SMB signing - NULL implementation - free signing context
166 ************************************************************/
168 static void null_free_signing_context(struct smb_sign_info
*si
)
174 SMB signing - NULL implementation - setup the MAC key.
176 @note Used as an initialisation only - it will not correctly
177 shut down a real signing mechanism
180 static BOOL
null_set_signing(struct smb_sign_info
*si
)
182 si
->signing_context
= NULL
;
184 si
->sign_outgoing_message
= null_sign_outgoing_message
;
185 si
->check_incoming_message
= null_check_incoming_message
;
186 si
->free_signing_context
= null_free_signing_context
;
192 * Free the signing context
195 static void free_signing_context(struct smb_sign_info
*si
)
197 if (si
->free_signing_context
) {
198 si
->free_signing_context(si
);
199 si
->signing_context
= NULL
;
202 null_set_signing(si
);
206 static BOOL
signing_good(char *inbuf
, struct smb_sign_info
*si
, BOOL good
, uint32 seq
, BOOL must_be_ok
)
210 if (!si
->doing_signing
) {
211 si
->doing_signing
= True
;
214 if (!si
->seen_valid
) {
215 si
->seen_valid
= True
;
219 if (!si
->mandatory_signing
&& !si
->seen_valid
) {
224 /* Non-mandatory signing - just turn off if this is the first bad packet.. */
225 DEBUG(5, ("srv_check_incoming_message: signing negotiated but not required and peer\n"
226 "isn't sending correct signatures. Turning off.\n"));
227 si
->negotiated_smb_signing
= False
;
228 si
->allow_smb_signing
= False
;
229 si
->doing_signing
= False
;
230 free_signing_context(si
);
232 } else if (!must_be_ok
) {
233 /* This packet is known to be unsigned */
236 /* Mandatory signing or bad packet after signing started - fail and disconnect. */
238 DEBUG(0, ("signing_good: BAD SIG: seq %u\n", (unsigned int)seq
));
245 /***********************************************************
246 SMB signing - Simple implementation - calculate a MAC on the packet
247 ************************************************************/
249 static void simple_packet_signature(struct smb_basic_signing_context
*data
,
250 const uchar
*buf
, uint32 seq_number
,
251 unsigned char calc_md5_mac
[16])
253 const size_t offset_end_of_sig
= (smb_ss_field
+ 8);
254 unsigned char sequence_buf
[8];
255 struct MD5Context md5_ctx
;
257 /* JRA - apparently this is incorrect. */
258 unsigned char key_buf
[16];
262 * Firstly put the sequence number into the first 4 bytes.
263 * and zero out the next 4 bytes.
265 * We do this here, to avoid modifying the packet.
268 DEBUG(10,("simple_packet_signature: sequence number %u\n", seq_number
));
270 SIVAL(sequence_buf
, 0, seq_number
);
271 SIVAL(sequence_buf
, 4, 0);
273 /* Calculate the 16 byte MAC - but don't alter the data in the
276 This makes for a bit of fussing about, but it's not too bad.
280 /* intialise with the key */
281 MD5Update(&md5_ctx
, data
->mac_key
.data
, data
->mac_key
.length
);
283 /* JRA - apparently this is incorrect. */
284 /* NB. When making and verifying SMB signatures, Windows apparently
285 zero-pads the key to 128 bits if it isn't long enough.
286 From Nalin Dahyabhai <nalin@redhat.com> */
287 if (data
->mac_key
.length
< sizeof(key_buf
)) {
288 memset(key_buf
, 0, sizeof(key_buf
));
289 MD5Update(&md5_ctx
, key_buf
, sizeof(key_buf
) - data
->mac_key
.length
);
293 /* copy in the first bit of the SMB header */
294 MD5Update(&md5_ctx
, buf
+ 4, smb_ss_field
- 4);
296 /* copy in the sequence number, instead of the signature */
297 MD5Update(&md5_ctx
, sequence_buf
, sizeof(sequence_buf
));
299 /* copy in the rest of the packet in, skipping the signature */
300 MD5Update(&md5_ctx
, buf
+ offset_end_of_sig
,
301 smb_len(buf
) - (offset_end_of_sig
- 4));
303 /* calculate the MD5 sig */
304 MD5Final(calc_md5_mac
, &md5_ctx
);
308 /***********************************************************
309 SMB signing - Client implementation - send the MAC.
310 ************************************************************/
312 static void client_sign_outgoing_message(char *outbuf
, struct smb_sign_info
*si
)
314 unsigned char calc_md5_mac
[16];
315 struct smb_basic_signing_context
*data
=
316 (struct smb_basic_signing_context
*)si
->signing_context
;
318 if (!si
->doing_signing
)
321 /* JRA Paranioa test - we should be able to get rid of this... */
322 if (smb_len(outbuf
) < (smb_ss_field
+ 8 - 4)) {
323 DEBUG(1, ("client_sign_outgoing_message: Logic error. Can't check signature on short packet! smb_len = %u\n",
328 /* mark the packet as signed - BEFORE we sign it...*/
329 mark_packet_signed(outbuf
);
331 simple_packet_signature(data
, (const unsigned char *)outbuf
,
332 data
->send_seq_num
, calc_md5_mac
);
334 DEBUG(10, ("client_sign_outgoing_message: sent SMB signature of\n"));
335 dump_data(10, (const char *)calc_md5_mac
, 8);
337 memcpy(&outbuf
[smb_ss_field
], calc_md5_mac
, 8);
339 /* cli->outbuf[smb_ss_field+2]=0;
340 Uncomment this to test if the remote server actually verifies signatures...*/
342 /* Instead of re-introducing the trans_info_conect we
343 used to have here, we use the fact that during a
344 SMBtrans/SMBtrans2/SMBnttrans send that the mid stays
345 constant. This means that calling store_sequence_for_reply()
346 will return False for all trans secondaries, as the mid is already
347 on the stored sequence list. As the send_seqence_number must
348 remain constant for all primary+secondary trans sends, we
349 only increment the send sequence number when we successfully
350 add a new entry to the outstanding sequence list. This means
351 I can isolate the fix here rather than re-adding the trans
352 signing on/off calls in libsmb/clitrans2.c JRA.
355 if (store_sequence_for_reply(&data
->outstanding_packet_list
, SVAL(outbuf
,smb_mid
), data
->send_seq_num
+ 1)) {
356 data
->send_seq_num
+= 2;
360 /***********************************************************
361 SMB signing - Client implementation - check a MAC sent by server.
362 ************************************************************/
364 static BOOL
client_check_incoming_message(char *inbuf
, struct smb_sign_info
*si
, BOOL must_be_ok
)
367 uint32 reply_seq_number
;
368 unsigned char calc_md5_mac
[16];
369 unsigned char *server_sent_mac
;
371 struct smb_basic_signing_context
*data
=
372 (struct smb_basic_signing_context
*)si
->signing_context
;
374 if (!si
->doing_signing
)
377 if (smb_len(inbuf
) < (smb_ss_field
+ 8 - 4)) {
378 DEBUG(1, ("client_check_incoming_message: Can't check signature on short packet! smb_len = %u\n", smb_len(inbuf
)));
382 if (!get_sequence_for_reply(&data
->outstanding_packet_list
, SVAL(inbuf
, smb_mid
), &reply_seq_number
)) {
383 DEBUG(1, ("client_check_incoming_message: received message "
384 "with mid %u with no matching send record.\n", (unsigned int)SVAL(inbuf
, smb_mid
) ));
388 simple_packet_signature(data
, (const unsigned char *)inbuf
,
389 reply_seq_number
, calc_md5_mac
);
391 server_sent_mac
= (unsigned char *)&inbuf
[smb_ss_field
];
392 good
= (memcmp(server_sent_mac
, calc_md5_mac
, 8) == 0);
395 DEBUG(5, ("client_check_incoming_message: BAD SIG: wanted SMB signature of\n"));
396 dump_data(5, (const char *)calc_md5_mac
, 8);
398 DEBUG(5, ("client_check_incoming_message: BAD SIG: got SMB signature of\n"));
399 dump_data(5, (const char *)server_sent_mac
, 8);
403 for (i
= -5; i
< 5; i
++) {
404 simple_packet_signature(data
, (const unsigned char *)inbuf
, reply_seq_number
+i
, calc_md5_mac
);
405 if (memcmp(server_sent_mac
, calc_md5_mac
, 8) == 0) {
406 DEBUG(0,("client_check_incoming_message: out of seq. seq num %u matches. \
407 We were expecting seq %u\n", reply_seq_number
+i
, reply_seq_number
));
415 DEBUG(10, ("client_check_incoming_message: seq %u: got good SMB signature of\n", (unsigned int)reply_seq_number
));
416 dump_data(10, (const char *)server_sent_mac
, 8);
418 return signing_good(inbuf
, si
, good
, reply_seq_number
, must_be_ok
);
421 /***********************************************************
422 SMB signing - Simple implementation - free signing context
423 ************************************************************/
425 static void simple_free_signing_context(struct smb_sign_info
*si
)
427 struct smb_basic_signing_context
*data
=
428 (struct smb_basic_signing_context
*)si
->signing_context
;
429 struct outstanding_packet_lookup
*list
;
430 struct outstanding_packet_lookup
*next
;
432 for (list
= data
->outstanding_packet_list
; list
; list
= next
) {
434 DLIST_REMOVE(data
->outstanding_packet_list
, list
);
438 data_blob_free(&data
->mac_key
);
440 SAFE_FREE(si
->signing_context
);
445 /***********************************************************
446 SMB signing - Simple implementation - setup the MAC key.
447 ************************************************************/
449 BOOL
cli_simple_set_signing(struct cli_state
*cli
,
450 const DATA_BLOB user_session_key
,
451 const DATA_BLOB response
)
453 struct smb_basic_signing_context
*data
;
455 if (!user_session_key
.length
)
458 if (!cli_set_smb_signing_common(cli
)) {
462 if (!set_smb_signing_real_common(&cli
->sign_info
)) {
466 data
= SMB_XMALLOC_P(struct smb_basic_signing_context
);
467 memset(data
, '\0', sizeof(*data
));
469 cli
->sign_info
.signing_context
= data
;
471 data
->mac_key
= data_blob(NULL
, response
.length
+ user_session_key
.length
);
473 memcpy(&data
->mac_key
.data
[0], user_session_key
.data
, user_session_key
.length
);
475 DEBUG(10, ("cli_simple_set_signing: user_session_key\n"));
476 dump_data(10, (const char *)user_session_key
.data
, user_session_key
.length
);
478 if (response
.length
) {
479 memcpy(&data
->mac_key
.data
[user_session_key
.length
],response
.data
, response
.length
);
480 DEBUG(10, ("cli_simple_set_signing: response_data\n"));
481 dump_data(10, (const char *)response
.data
, response
.length
);
483 DEBUG(10, ("cli_simple_set_signing: NULL response_data\n"));
486 dump_data_pw("MAC ssession key is:\n", data
->mac_key
.data
, data
->mac_key
.length
);
488 /* Initialise the sequence number */
489 data
->send_seq_num
= 0;
491 /* Initialise the list of outstanding packets */
492 data
->outstanding_packet_list
= NULL
;
494 cli
->sign_info
.sign_outgoing_message
= client_sign_outgoing_message
;
495 cli
->sign_info
.check_incoming_message
= client_check_incoming_message
;
496 cli
->sign_info
.free_signing_context
= simple_free_signing_context
;
501 /***********************************************************
502 SMB signing - TEMP implementation - calculate a MAC to send.
503 ************************************************************/
505 static void temp_sign_outgoing_message(char *outbuf
, struct smb_sign_info
*si
)
507 /* mark the packet as signed - BEFORE we sign it...*/
508 mark_packet_signed(outbuf
);
510 /* I wonder what BSRSPYL stands for - but this is what MS
512 memcpy(&outbuf
[smb_ss_field
], "BSRSPYL ", 8);
516 /***********************************************************
517 SMB signing - TEMP implementation - check a MAC sent by server.
518 ************************************************************/
520 static BOOL
temp_check_incoming_message(char *inbuf
, struct smb_sign_info
*si
, BOOL foo
)
525 /***********************************************************
526 SMB signing - TEMP implementation - free signing context
527 ************************************************************/
529 static void temp_free_signing_context(struct smb_sign_info
*si
)
534 /***********************************************************
535 SMB signing - NULL implementation - setup the MAC key.
536 ************************************************************/
538 BOOL
cli_null_set_signing(struct cli_state
*cli
)
540 return null_set_signing(&cli
->sign_info
);
543 /***********************************************************
544 SMB signing - temp implementation - setup the MAC key.
545 ************************************************************/
547 BOOL
cli_temp_set_signing(struct cli_state
*cli
)
549 if (!cli_set_smb_signing_common(cli
)) {
553 cli
->sign_info
.signing_context
= NULL
;
555 cli
->sign_info
.sign_outgoing_message
= temp_sign_outgoing_message
;
556 cli
->sign_info
.check_incoming_message
= temp_check_incoming_message
;
557 cli
->sign_info
.free_signing_context
= temp_free_signing_context
;
562 void cli_free_signing_context(struct cli_state
*cli
)
564 free_signing_context(&cli
->sign_info
);
568 * Sign a packet with the current mechanism
571 void cli_calculate_sign_mac(struct cli_state
*cli
)
573 cli
->sign_info
.sign_outgoing_message(cli
->outbuf
, &cli
->sign_info
);
577 * Check a packet with the current mechanism
578 * @return False if we had an established signing connection
579 * which had a bad checksum, True otherwise.
582 BOOL
cli_check_sign_mac(struct cli_state
*cli
)
584 if (!cli
->sign_info
.check_incoming_message(cli
->inbuf
, &cli
->sign_info
, True
)) {
585 free_signing_context(&cli
->sign_info
);
591 /***********************************************************
592 SMB signing - Server implementation - send the MAC.
593 ************************************************************/
595 static void srv_sign_outgoing_message(char *outbuf
, struct smb_sign_info
*si
)
597 unsigned char calc_md5_mac
[16];
598 struct smb_basic_signing_context
*data
=
599 (struct smb_basic_signing_context
*)si
->signing_context
;
600 uint32 send_seq_number
= data
->send_seq_num
-1;
603 if (!si
->doing_signing
) {
607 /* JRA Paranioa test - we should be able to get rid of this... */
608 if (smb_len(outbuf
) < (smb_ss_field
+ 8 - 4)) {
609 DEBUG(1, ("srv_sign_outgoing_message: Logic error. Can't send signature on short packet! smb_len = %u\n",
614 /* mark the packet as signed - BEFORE we sign it...*/
615 mark_packet_signed(outbuf
);
617 mid
= SVAL(outbuf
, smb_mid
);
619 /* See if this is a reply for a deferred packet. */
620 get_sequence_for_reply(&data
->outstanding_packet_list
, mid
, &send_seq_number
);
622 simple_packet_signature(data
, (const unsigned char *)outbuf
, send_seq_number
, calc_md5_mac
);
624 DEBUG(10, ("srv_sign_outgoing_message: seq %u: sent SMB signature of\n", (unsigned int)send_seq_number
));
625 dump_data(10, (const char *)calc_md5_mac
, 8);
627 memcpy(&outbuf
[smb_ss_field
], calc_md5_mac
, 8);
629 /* cli->outbuf[smb_ss_field+2]=0;
630 Uncomment this to test if the remote client actually verifies signatures...*/
633 /***********************************************************
634 SMB signing - Server implementation - check a MAC sent by server.
635 ************************************************************/
637 static BOOL
srv_check_incoming_message(char *inbuf
, struct smb_sign_info
*si
, BOOL must_be_ok
)
640 struct smb_basic_signing_context
*data
=
641 (struct smb_basic_signing_context
*)si
->signing_context
;
642 uint32 reply_seq_number
= data
->send_seq_num
;
644 unsigned char calc_md5_mac
[16];
645 unsigned char *server_sent_mac
;
647 if (!si
->doing_signing
)
650 if (smb_len(inbuf
) < (smb_ss_field
+ 8 - 4)) {
651 DEBUG(1, ("srv_check_incoming_message: Can't check signature on short packet! smb_len = %u\n", smb_len(inbuf
)));
655 /* We always increment the sequence number. */
656 data
->send_seq_num
+= 2;
658 saved_seq
= reply_seq_number
;
659 simple_packet_signature(data
, (const unsigned char *)inbuf
, reply_seq_number
, calc_md5_mac
);
661 server_sent_mac
= (unsigned char *)&inbuf
[smb_ss_field
];
662 good
= (memcmp(server_sent_mac
, calc_md5_mac
, 8) == 0);
667 DEBUG(0, ("srv_check_incoming_message: BAD SIG: seq %u wanted SMB signature of\n",
668 (unsigned int)saved_seq
));
669 dump_data(5, (const char *)calc_md5_mac
, 8);
671 DEBUG(0, ("srv_check_incoming_message: BAD SIG: seq %u got SMB signature of\n",
672 (unsigned int)reply_seq_number
));
673 dump_data(5, (const char *)server_sent_mac
, 8);
679 reply_seq_number
-= 5;
680 for (i
= 0; i
< 10; i
++, reply_seq_number
++) {
681 simple_packet_signature(data
, (const unsigned char *)inbuf
, reply_seq_number
, calc_md5_mac
);
682 if (memcmp(server_sent_mac
, calc_md5_mac
, 8) == 0) {
683 DEBUG(0,("srv_check_incoming_message: out of seq. seq num %u matches. \
684 We were expecting seq %u\n", reply_seq_number
, saved_seq
));
692 DEBUG(10, ("srv_check_incoming_message: seq %u: (current is %u) got good SMB signature of\n", (unsigned int)reply_seq_number
, (unsigned int)data
->send_seq_num
));
693 dump_data(10, (const char *)server_sent_mac
, 8);
696 return (signing_good(inbuf
, si
, good
, saved_seq
, must_be_ok
));
699 /***********************************************************
700 SMB signing - server API's.
701 ************************************************************/
703 static struct smb_sign_info srv_sign_info
= {
704 null_sign_outgoing_message
,
705 null_check_incoming_message
,
706 null_free_signing_context
,
714 /***********************************************************
715 Turn signing off or on for oplock break code.
716 ************************************************************/
718 BOOL
srv_oplock_set_signing(BOOL onoff
)
720 BOOL ret
= srv_sign_info
.doing_signing
;
721 srv_sign_info
.doing_signing
= onoff
;
725 /***********************************************************
726 Called to validate an incoming packet from the client.
727 ************************************************************/
729 BOOL
srv_check_sign_mac(char *inbuf
, BOOL must_be_ok
)
731 /* Check if it's a session keepalive. */
732 if(CVAL(inbuf
,0) == SMBkeepalive
)
735 return srv_sign_info
.check_incoming_message(inbuf
, &srv_sign_info
, must_be_ok
);
738 /***********************************************************
739 Called to sign an outgoing packet to the client.
740 ************************************************************/
742 void srv_calculate_sign_mac(char *outbuf
)
744 /* Check if it's a session keepalive. */
745 /* JRA Paranioa test - do we ever generate these in the server ? */
746 if(CVAL(outbuf
,0) == SMBkeepalive
)
749 srv_sign_info
.sign_outgoing_message(outbuf
, &srv_sign_info
);
752 /***********************************************************
753 Called by server to defer an outgoing packet.
754 ************************************************************/
756 void srv_defer_sign_response(uint16 mid
)
758 struct smb_basic_signing_context
*data
;
760 if (!srv_sign_info
.doing_signing
)
763 data
= (struct smb_basic_signing_context
*)srv_sign_info
.signing_context
;
769 * Ensure we only store this mid reply once...
772 store_sequence_for_reply(&data
->outstanding_packet_list
, mid
,
773 data
->send_seq_num
-1);
776 /***********************************************************
777 Called to remove sequence records when a deferred packet is
778 cancelled by mid. This should never find one....
779 ************************************************************/
781 void srv_cancel_sign_response(uint16 mid
)
783 struct smb_basic_signing_context
*data
;
786 if (!srv_sign_info
.doing_signing
)
789 data
= (struct smb_basic_signing_context
*)srv_sign_info
.signing_context
;
794 DEBUG(10,("srv_cancel_sign_response: for mid %u\n", (unsigned int)mid
));
796 while (get_sequence_for_reply(&data
->outstanding_packet_list
, mid
, &dummy_seq
))
799 /* cancel doesn't send a reply so doesn't burn a sequence number. */
800 data
->send_seq_num
-= 1;
803 /***********************************************************
804 Called by server negprot when signing has been negotiated.
805 ************************************************************/
807 void srv_set_signing_negotiated(void)
809 srv_sign_info
.allow_smb_signing
= True
;
810 srv_sign_info
.negotiated_smb_signing
= True
;
811 if (lp_server_signing() == Required
)
812 srv_sign_info
.mandatory_signing
= True
;
814 srv_sign_info
.sign_outgoing_message
= temp_sign_outgoing_message
;
815 srv_sign_info
.check_incoming_message
= temp_check_incoming_message
;
816 srv_sign_info
.free_signing_context
= temp_free_signing_context
;
819 /***********************************************************
820 Returns whether signing is active. We can't use sendfile or raw
821 reads/writes if it is.
822 ************************************************************/
824 BOOL
srv_is_signing_active(void)
826 return srv_sign_info
.doing_signing
;
830 /***********************************************************
831 Returns whether signing is negotiated. We can't use it unless it was
833 ************************************************************/
835 BOOL
srv_is_signing_negotiated(void)
837 return srv_sign_info
.negotiated_smb_signing
;
840 /***********************************************************
841 Returns whether signing is actually happening
842 ************************************************************/
844 BOOL
srv_signing_started(void)
846 struct smb_basic_signing_context
*data
;
848 if (!srv_sign_info
.doing_signing
) {
852 data
= (struct smb_basic_signing_context
*)srv_sign_info
.signing_context
;
856 if (data
->send_seq_num
== 0) {
863 /***********************************************************
864 Turn on signing from this packet onwards.
865 ************************************************************/
867 void srv_set_signing(const DATA_BLOB user_session_key
, const DATA_BLOB response
)
869 struct smb_basic_signing_context
*data
;
871 if (!user_session_key
.length
)
874 if (!srv_sign_info
.negotiated_smb_signing
&& !srv_sign_info
.mandatory_signing
) {
875 DEBUG(5,("srv_set_signing: signing negotiated = %u, mandatory_signing = %u. Not allowing smb signing.\n",
876 (unsigned int)srv_sign_info
.negotiated_smb_signing
,
877 (unsigned int)srv_sign_info
.mandatory_signing
));
881 /* Once we've turned on, ignore any more sessionsetups. */
882 if (srv_sign_info
.doing_signing
) {
886 if (srv_sign_info
.free_signing_context
)
887 srv_sign_info
.free_signing_context(&srv_sign_info
);
889 srv_sign_info
.doing_signing
= True
;
891 data
= SMB_XMALLOC_P(struct smb_basic_signing_context
);
892 memset(data
, '\0', sizeof(*data
));
894 srv_sign_info
.signing_context
= data
;
896 data
->mac_key
= data_blob(NULL
, response
.length
+ user_session_key
.length
);
898 memcpy(&data
->mac_key
.data
[0], user_session_key
.data
, user_session_key
.length
);
900 memcpy(&data
->mac_key
.data
[user_session_key
.length
],response
.data
, response
.length
);
902 dump_data_pw("MAC ssession key is:\n", data
->mac_key
.data
, data
->mac_key
.length
);
904 DEBUG(3,("srv_set_signing: turning on SMB signing: signing negotiated = %s, mandatory_signing = %s.\n",
905 BOOLSTR(srv_sign_info
.negotiated_smb_signing
),
906 BOOLSTR(srv_sign_info
.mandatory_signing
) ));
908 /* Initialise the sequence number */
909 data
->send_seq_num
= 0;
911 /* Initialise the list of outstanding packets */
912 data
->outstanding_packet_list
= NULL
;
914 srv_sign_info
.sign_outgoing_message
= srv_sign_outgoing_message
;
915 srv_sign_info
.check_incoming_message
= srv_check_incoming_message
;
916 srv_sign_info
.free_signing_context
= simple_free_signing_context
;