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
;
29 BOOL can_delete
; /* Set to False in trans state. */
32 struct smb_basic_signing_context
{
35 struct outstanding_packet_lookup
*outstanding_packet_list
;
38 static BOOL
store_sequence_for_reply(struct outstanding_packet_lookup
**list
,
39 uint16 mid
, uint32 reply_seq_num
)
41 struct outstanding_packet_lookup
*t
;
43 /* Ensure we only add a mid once. */
44 for (t
= *list
; t
; t
= t
->next
) {
50 t
= SMB_XMALLOC_P(struct outstanding_packet_lookup
);
54 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
));
83 DLIST_REMOVE(*list
, t
);
92 static BOOL
set_sequence_can_delete_flag(struct outstanding_packet_lookup
**list
, uint16 mid
, BOOL can_delete_entry
)
94 struct outstanding_packet_lookup
*t
;
96 for (t
= *list
; t
; t
= t
->next
) {
98 t
->can_delete
= can_delete_entry
;
105 /***********************************************************
106 SMB signing - Common code before we set a new signing implementation
107 ************************************************************/
109 static BOOL
cli_set_smb_signing_common(struct cli_state
*cli
)
111 if (!cli
->sign_info
.allow_smb_signing
) {
115 if (!cli
->sign_info
.negotiated_smb_signing
116 && !cli
->sign_info
.mandatory_signing
) {
120 if (cli
->sign_info
.doing_signing
) {
124 if (cli
->sign_info
.free_signing_context
)
125 cli
->sign_info
.free_signing_context(&cli
->sign_info
);
127 /* These calls are INCOMPATIBLE with SMB signing */
128 cli
->readbraw_supported
= False
;
129 cli
->writebraw_supported
= False
;
134 /***********************************************************
135 SMB signing - Common code for 'real' implementations
136 ************************************************************/
138 static BOOL
set_smb_signing_real_common(struct smb_sign_info
*si
)
140 if (si
->mandatory_signing
) {
141 DEBUG(5, ("Mandatory SMB signing enabled!\n"));
144 si
->doing_signing
= True
;
145 DEBUG(5, ("SMB signing enabled!\n"));
150 static void mark_packet_signed(char *outbuf
)
153 flags2
= SVAL(outbuf
,smb_flg2
);
154 flags2
|= FLAGS2_SMB_SECURITY_SIGNATURES
;
155 SSVAL(outbuf
,smb_flg2
, flags2
);
158 /***********************************************************
159 SMB signing - NULL implementation - calculate a MAC to send.
160 ************************************************************/
162 static void null_sign_outgoing_message(char *outbuf
, struct smb_sign_info
*si
)
164 /* we can't zero out the sig, as we might be trying to send a
165 session request - which is NBT-level, not SMB level and doesn't
170 /***********************************************************
171 SMB signing - NULL implementation - check a MAC sent by server.
172 ************************************************************/
174 static BOOL
null_check_incoming_message(char *inbuf
, struct smb_sign_info
*si
, BOOL must_be_ok
)
179 /***********************************************************
180 SMB signing - NULL implementation - free signing context
181 ************************************************************/
183 static void null_free_signing_context(struct smb_sign_info
*si
)
189 SMB signing - NULL implementation - setup the MAC key.
191 @note Used as an initialisation only - it will not correctly
192 shut down a real signing mechanism
195 static BOOL
null_set_signing(struct smb_sign_info
*si
)
197 si
->signing_context
= NULL
;
199 si
->sign_outgoing_message
= null_sign_outgoing_message
;
200 si
->check_incoming_message
= null_check_incoming_message
;
201 si
->free_signing_context
= null_free_signing_context
;
207 * Free the signing context
210 static void free_signing_context(struct smb_sign_info
*si
)
212 if (si
->free_signing_context
) {
213 si
->free_signing_context(si
);
214 si
->signing_context
= NULL
;
217 null_set_signing(si
);
221 static BOOL
signing_good(char *inbuf
, struct smb_sign_info
*si
, BOOL good
, uint32 seq
, BOOL must_be_ok
)
225 if (!si
->doing_signing
) {
226 si
->doing_signing
= True
;
229 if (!si
->seen_valid
) {
230 si
->seen_valid
= True
;
234 if (!si
->mandatory_signing
&& !si
->seen_valid
) {
239 /* Non-mandatory signing - just turn off if this is the first bad packet.. */
240 DEBUG(5, ("srv_check_incoming_message: signing negotiated but not required and peer\n"
241 "isn't sending correct signatures. Turning off.\n"));
242 si
->negotiated_smb_signing
= False
;
243 si
->allow_smb_signing
= False
;
244 si
->doing_signing
= False
;
245 free_signing_context(si
);
247 } else if (!must_be_ok
) {
248 /* This packet is known to be unsigned */
251 /* Mandatory signing or bad packet after signing started - fail and disconnect. */
253 DEBUG(0, ("signing_good: BAD SIG: seq %u\n", (unsigned int)seq
));
260 /***********************************************************
261 SMB signing - Simple implementation - calculate a MAC on the packet
262 ************************************************************/
264 static void simple_packet_signature(struct smb_basic_signing_context
*data
,
265 const uchar
*buf
, uint32 seq_number
,
266 unsigned char calc_md5_mac
[16])
268 const size_t offset_end_of_sig
= (smb_ss_field
+ 8);
269 unsigned char sequence_buf
[8];
270 struct MD5Context md5_ctx
;
272 /* JRA - apparently this is incorrect. */
273 unsigned char key_buf
[16];
277 * Firstly put the sequence number into the first 4 bytes.
278 * and zero out the next 4 bytes.
280 * We do this here, to avoid modifying the packet.
283 DEBUG(10,("simple_packet_signature: sequence number %u\n", seq_number
));
285 SIVAL(sequence_buf
, 0, seq_number
);
286 SIVAL(sequence_buf
, 4, 0);
288 /* Calculate the 16 byte MAC - but don't alter the data in the
291 This makes for a bit of fussing about, but it's not too bad.
295 /* intialise with the key */
296 MD5Update(&md5_ctx
, data
->mac_key
.data
, data
->mac_key
.length
);
298 /* JRA - apparently this is incorrect. */
299 /* NB. When making and verifying SMB signatures, Windows apparently
300 zero-pads the key to 128 bits if it isn't long enough.
301 From Nalin Dahyabhai <nalin@redhat.com> */
302 if (data
->mac_key
.length
< sizeof(key_buf
)) {
303 memset(key_buf
, 0, sizeof(key_buf
));
304 MD5Update(&md5_ctx
, key_buf
, sizeof(key_buf
) - data
->mac_key
.length
);
308 /* copy in the first bit of the SMB header */
309 MD5Update(&md5_ctx
, buf
+ 4, smb_ss_field
- 4);
311 /* copy in the sequence number, instead of the signature */
312 MD5Update(&md5_ctx
, sequence_buf
, sizeof(sequence_buf
));
314 /* copy in the rest of the packet in, skipping the signature */
315 MD5Update(&md5_ctx
, buf
+ offset_end_of_sig
,
316 smb_len(buf
) - (offset_end_of_sig
- 4));
318 /* calculate the MD5 sig */
319 MD5Final(calc_md5_mac
, &md5_ctx
);
323 /***********************************************************
324 SMB signing - Client implementation - send the MAC.
325 ************************************************************/
327 static void client_sign_outgoing_message(char *outbuf
, struct smb_sign_info
*si
)
329 unsigned char calc_md5_mac
[16];
330 struct smb_basic_signing_context
*data
=
331 (struct smb_basic_signing_context
*)si
->signing_context
;
333 if (!si
->doing_signing
)
336 /* JRA Paranioa test - we should be able to get rid of this... */
337 if (smb_len(outbuf
) < (smb_ss_field
+ 8 - 4)) {
338 DEBUG(1, ("client_sign_outgoing_message: Logic error. Can't check signature on short packet! smb_len = %u\n",
343 /* mark the packet as signed - BEFORE we sign it...*/
344 mark_packet_signed(outbuf
);
346 simple_packet_signature(data
, (const unsigned char *)outbuf
,
347 data
->send_seq_num
, calc_md5_mac
);
349 DEBUG(10, ("client_sign_outgoing_message: sent SMB signature of\n"));
350 dump_data(10, (const char *)calc_md5_mac
, 8);
352 memcpy(&outbuf
[smb_ss_field
], calc_md5_mac
, 8);
354 /* cli->outbuf[smb_ss_field+2]=0;
355 Uncomment this to test if the remote server actually verifies signatures...*/
357 /* Instead of re-introducing the trans_info_conect we
358 used to have here, we use the fact that during a
359 SMBtrans/SMBtrans2/SMBnttrans send that the mid stays
360 constant. This means that calling store_sequence_for_reply()
361 will return False for all trans secondaries, as the mid is already
362 on the stored sequence list. As the send_seqence_number must
363 remain constant for all primary+secondary trans sends, we
364 only increment the send sequence number when we successfully
365 add a new entry to the outstanding sequence list. This means
366 I can isolate the fix here rather than re-adding the trans
367 signing on/off calls in libsmb/clitrans2.c JRA.
370 if (store_sequence_for_reply(&data
->outstanding_packet_list
, SVAL(outbuf
,smb_mid
), data
->send_seq_num
+ 1)) {
371 data
->send_seq_num
+= 2;
375 /***********************************************************
376 SMB signing - Client implementation - check a MAC sent by server.
377 ************************************************************/
379 static BOOL
client_check_incoming_message(char *inbuf
, struct smb_sign_info
*si
, BOOL must_be_ok
)
382 uint32 reply_seq_number
;
383 unsigned char calc_md5_mac
[16];
384 unsigned char *server_sent_mac
;
386 struct smb_basic_signing_context
*data
=
387 (struct smb_basic_signing_context
*)si
->signing_context
;
389 if (!si
->doing_signing
)
392 if (smb_len(inbuf
) < (smb_ss_field
+ 8 - 4)) {
393 DEBUG(1, ("client_check_incoming_message: Can't check signature on short packet! smb_len = %u\n", smb_len(inbuf
)));
397 if (!get_sequence_for_reply(&data
->outstanding_packet_list
, SVAL(inbuf
, smb_mid
), &reply_seq_number
)) {
398 DEBUG(1, ("client_check_incoming_message: received message "
399 "with mid %u with no matching send record.\n", (unsigned int)SVAL(inbuf
, smb_mid
) ));
403 simple_packet_signature(data
, (const unsigned char *)inbuf
,
404 reply_seq_number
, calc_md5_mac
);
406 server_sent_mac
= (unsigned char *)&inbuf
[smb_ss_field
];
407 good
= (memcmp(server_sent_mac
, calc_md5_mac
, 8) == 0);
410 DEBUG(5, ("client_check_incoming_message: BAD SIG: wanted SMB signature of\n"));
411 dump_data(5, (const char *)calc_md5_mac
, 8);
413 DEBUG(5, ("client_check_incoming_message: BAD SIG: got SMB signature of\n"));
414 dump_data(5, (const char *)server_sent_mac
, 8);
418 for (i
= -5; i
< 5; i
++) {
419 simple_packet_signature(data
, (const unsigned char *)inbuf
, reply_seq_number
+i
, calc_md5_mac
);
420 if (memcmp(server_sent_mac
, calc_md5_mac
, 8) == 0) {
421 DEBUG(0,("client_check_incoming_message: out of seq. seq num %u matches. \
422 We were expecting seq %u\n", reply_seq_number
+i
, reply_seq_number
));
430 DEBUG(10, ("client_check_incoming_message: seq %u: got good SMB signature of\n", (unsigned int)reply_seq_number
));
431 dump_data(10, (const char *)server_sent_mac
, 8);
433 return signing_good(inbuf
, si
, good
, reply_seq_number
, must_be_ok
);
436 /***********************************************************
437 SMB signing - Simple implementation - free signing context
438 ************************************************************/
440 static void simple_free_signing_context(struct smb_sign_info
*si
)
442 struct smb_basic_signing_context
*data
=
443 (struct smb_basic_signing_context
*)si
->signing_context
;
444 struct outstanding_packet_lookup
*list
;
445 struct outstanding_packet_lookup
*next
;
447 for (list
= data
->outstanding_packet_list
; list
; list
= next
) {
449 DLIST_REMOVE(data
->outstanding_packet_list
, list
);
453 data_blob_free(&data
->mac_key
);
455 SAFE_FREE(si
->signing_context
);
460 /***********************************************************
461 SMB signing - Simple implementation - setup the MAC key.
462 ************************************************************/
464 BOOL
cli_simple_set_signing(struct cli_state
*cli
,
465 const DATA_BLOB user_session_key
,
466 const DATA_BLOB response
)
468 struct smb_basic_signing_context
*data
;
470 if (!user_session_key
.length
)
473 if (!cli_set_smb_signing_common(cli
)) {
477 if (!set_smb_signing_real_common(&cli
->sign_info
)) {
481 data
= SMB_XMALLOC_P(struct smb_basic_signing_context
);
482 memset(data
, '\0', sizeof(*data
));
484 cli
->sign_info
.signing_context
= data
;
486 data
->mac_key
= data_blob(NULL
, response
.length
+ user_session_key
.length
);
488 memcpy(&data
->mac_key
.data
[0], user_session_key
.data
, user_session_key
.length
);
490 DEBUG(10, ("cli_simple_set_signing: user_session_key\n"));
491 dump_data(10, (const char *)user_session_key
.data
, user_session_key
.length
);
493 if (response
.length
) {
494 memcpy(&data
->mac_key
.data
[user_session_key
.length
],response
.data
, response
.length
);
495 DEBUG(10, ("cli_simple_set_signing: response_data\n"));
496 dump_data(10, (const char *)response
.data
, response
.length
);
498 DEBUG(10, ("cli_simple_set_signing: NULL response_data\n"));
501 dump_data_pw("MAC ssession key is:\n", data
->mac_key
.data
, data
->mac_key
.length
);
503 /* Initialise the sequence number */
504 data
->send_seq_num
= 0;
506 /* Initialise the list of outstanding packets */
507 data
->outstanding_packet_list
= NULL
;
509 cli
->sign_info
.sign_outgoing_message
= client_sign_outgoing_message
;
510 cli
->sign_info
.check_incoming_message
= client_check_incoming_message
;
511 cli
->sign_info
.free_signing_context
= simple_free_signing_context
;
516 /***********************************************************
517 SMB signing - TEMP implementation - calculate a MAC to send.
518 ************************************************************/
520 static void temp_sign_outgoing_message(char *outbuf
, struct smb_sign_info
*si
)
522 /* mark the packet as signed - BEFORE we sign it...*/
523 mark_packet_signed(outbuf
);
525 /* I wonder what BSRSPYL stands for - but this is what MS
527 memcpy(&outbuf
[smb_ss_field
], "BSRSPYL ", 8);
531 /***********************************************************
532 SMB signing - TEMP implementation - check a MAC sent by server.
533 ************************************************************/
535 static BOOL
temp_check_incoming_message(char *inbuf
, struct smb_sign_info
*si
, BOOL foo
)
540 /***********************************************************
541 SMB signing - TEMP implementation - free signing context
542 ************************************************************/
544 static void temp_free_signing_context(struct smb_sign_info
*si
)
549 /***********************************************************
550 SMB signing - NULL implementation - setup the MAC key.
551 ************************************************************/
553 BOOL
cli_null_set_signing(struct cli_state
*cli
)
555 return null_set_signing(&cli
->sign_info
);
558 /***********************************************************
559 SMB signing - temp implementation - setup the MAC key.
560 ************************************************************/
562 BOOL
cli_temp_set_signing(struct cli_state
*cli
)
564 if (!cli_set_smb_signing_common(cli
)) {
568 cli
->sign_info
.signing_context
= NULL
;
570 cli
->sign_info
.sign_outgoing_message
= temp_sign_outgoing_message
;
571 cli
->sign_info
.check_incoming_message
= temp_check_incoming_message
;
572 cli
->sign_info
.free_signing_context
= temp_free_signing_context
;
577 void cli_free_signing_context(struct cli_state
*cli
)
579 free_signing_context(&cli
->sign_info
);
583 * Sign a packet with the current mechanism
586 void cli_calculate_sign_mac(struct cli_state
*cli
)
588 cli
->sign_info
.sign_outgoing_message(cli
->outbuf
, &cli
->sign_info
);
592 * Check a packet with the current mechanism
593 * @return False if we had an established signing connection
594 * which had a bad checksum, True otherwise.
597 BOOL
cli_check_sign_mac(struct cli_state
*cli
)
599 if (!cli
->sign_info
.check_incoming_message(cli
->inbuf
, &cli
->sign_info
, True
)) {
600 free_signing_context(&cli
->sign_info
);
606 /***********************************************************
607 Enter trans/trans2/nttrans state.
608 ************************************************************/
610 BOOL
client_set_trans_sign_state_on(struct cli_state
*cli
, uint16 mid
)
612 struct smb_sign_info
*si
= &cli
->sign_info
;
613 struct smb_basic_signing_context
*data
= (struct smb_basic_signing_context
*)si
->signing_context
;
615 if (!si
->doing_signing
) {
619 if (!set_sequence_can_delete_flag(&data
->outstanding_packet_list
, mid
, False
)) {
626 /***********************************************************
627 Leave trans/trans2/nttrans state.
628 ************************************************************/
630 BOOL
client_set_trans_sign_state_off(struct cli_state
*cli
, uint16 mid
)
632 uint32 reply_seq_num
;
633 struct smb_sign_info
*si
= &cli
->sign_info
;
634 struct smb_basic_signing_context
*data
= (struct smb_basic_signing_context
*)si
->signing_context
;
636 if (!si
->doing_signing
) {
640 if (!set_sequence_can_delete_flag(&data
->outstanding_packet_list
, mid
, True
)) {
644 /* Now delete the stored mid entry. */
645 if (!get_sequence_for_reply(&data
->outstanding_packet_list
, mid
, &reply_seq_num
)) {
652 /***********************************************************
653 SMB signing - Server implementation - send the MAC.
654 ************************************************************/
656 static void srv_sign_outgoing_message(char *outbuf
, struct smb_sign_info
*si
)
658 unsigned char calc_md5_mac
[16];
659 struct smb_basic_signing_context
*data
=
660 (struct smb_basic_signing_context
*)si
->signing_context
;
661 uint32 send_seq_number
= data
->send_seq_num
-1;
664 if (!si
->doing_signing
) {
668 /* JRA Paranioa test - we should be able to get rid of this... */
669 if (smb_len(outbuf
) < (smb_ss_field
+ 8 - 4)) {
670 DEBUG(1, ("srv_sign_outgoing_message: Logic error. Can't send signature on short packet! smb_len = %u\n",
675 /* mark the packet as signed - BEFORE we sign it...*/
676 mark_packet_signed(outbuf
);
678 mid
= SVAL(outbuf
, smb_mid
);
680 /* See if this is a reply for a deferred packet. */
681 get_sequence_for_reply(&data
->outstanding_packet_list
, mid
, &send_seq_number
);
683 simple_packet_signature(data
, (const unsigned char *)outbuf
, send_seq_number
, calc_md5_mac
);
685 DEBUG(10, ("srv_sign_outgoing_message: seq %u: sent SMB signature of\n", (unsigned int)send_seq_number
));
686 dump_data(10, (const char *)calc_md5_mac
, 8);
688 memcpy(&outbuf
[smb_ss_field
], calc_md5_mac
, 8);
690 /* cli->outbuf[smb_ss_field+2]=0;
691 Uncomment this to test if the remote client actually verifies signatures...*/
694 /***********************************************************
695 SMB signing - Server implementation - check a MAC sent by server.
696 ************************************************************/
698 static BOOL
srv_check_incoming_message(char *inbuf
, struct smb_sign_info
*si
, BOOL must_be_ok
)
701 struct smb_basic_signing_context
*data
=
702 (struct smb_basic_signing_context
*)si
->signing_context
;
703 uint32 reply_seq_number
= data
->send_seq_num
;
705 unsigned char calc_md5_mac
[16];
706 unsigned char *server_sent_mac
;
708 if (!si
->doing_signing
)
711 if (smb_len(inbuf
) < (smb_ss_field
+ 8 - 4)) {
712 DEBUG(1, ("srv_check_incoming_message: Can't check signature on short packet! smb_len = %u\n", smb_len(inbuf
)));
716 /* We always increment the sequence number. */
717 data
->send_seq_num
+= 2;
719 saved_seq
= reply_seq_number
;
720 simple_packet_signature(data
, (const unsigned char *)inbuf
, reply_seq_number
, calc_md5_mac
);
722 server_sent_mac
= (unsigned char *)&inbuf
[smb_ss_field
];
723 good
= (memcmp(server_sent_mac
, calc_md5_mac
, 8) == 0);
728 DEBUG(0, ("srv_check_incoming_message: BAD SIG: seq %u wanted SMB signature of\n",
729 (unsigned int)saved_seq
));
730 dump_data(5, (const char *)calc_md5_mac
, 8);
732 DEBUG(0, ("srv_check_incoming_message: BAD SIG: seq %u got SMB signature of\n",
733 (unsigned int)reply_seq_number
));
734 dump_data(5, (const char *)server_sent_mac
, 8);
740 reply_seq_number
-= 5;
741 for (i
= 0; i
< 10; i
++, reply_seq_number
++) {
742 simple_packet_signature(data
, (const unsigned char *)inbuf
, reply_seq_number
, calc_md5_mac
);
743 if (memcmp(server_sent_mac
, calc_md5_mac
, 8) == 0) {
744 DEBUG(0,("srv_check_incoming_message: out of seq. seq num %u matches. \
745 We were expecting seq %u\n", reply_seq_number
, saved_seq
));
753 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
));
754 dump_data(10, (const char *)server_sent_mac
, 8);
757 return (signing_good(inbuf
, si
, good
, saved_seq
, must_be_ok
));
760 /***********************************************************
761 SMB signing - server API's.
762 ************************************************************/
764 static struct smb_sign_info srv_sign_info
= {
765 null_sign_outgoing_message
,
766 null_check_incoming_message
,
767 null_free_signing_context
,
775 /***********************************************************
776 Turn signing off or on for oplock break code.
777 ************************************************************/
779 BOOL
srv_oplock_set_signing(BOOL onoff
)
781 BOOL ret
= srv_sign_info
.doing_signing
;
782 srv_sign_info
.doing_signing
= onoff
;
786 /***********************************************************
787 Called to validate an incoming packet from the client.
788 ************************************************************/
790 BOOL
srv_check_sign_mac(char *inbuf
, BOOL must_be_ok
)
792 /* Check if it's a session keepalive. */
793 if(CVAL(inbuf
,0) == SMBkeepalive
)
796 return srv_sign_info
.check_incoming_message(inbuf
, &srv_sign_info
, must_be_ok
);
799 /***********************************************************
800 Called to sign an outgoing packet to the client.
801 ************************************************************/
803 void srv_calculate_sign_mac(char *outbuf
)
805 /* Check if it's a session keepalive. */
806 /* JRA Paranioa test - do we ever generate these in the server ? */
807 if(CVAL(outbuf
,0) == SMBkeepalive
)
810 srv_sign_info
.sign_outgoing_message(outbuf
, &srv_sign_info
);
813 /***********************************************************
814 Called by server to defer an outgoing packet.
815 ************************************************************/
817 void srv_defer_sign_response(uint16 mid
)
819 struct smb_basic_signing_context
*data
;
821 if (!srv_sign_info
.doing_signing
)
824 data
= (struct smb_basic_signing_context
*)srv_sign_info
.signing_context
;
830 * Ensure we only store this mid reply once...
833 store_sequence_for_reply(&data
->outstanding_packet_list
, mid
,
834 data
->send_seq_num
-1);
837 /***********************************************************
838 Called to remove sequence records when a deferred packet is
839 cancelled by mid. This should never find one....
840 ************************************************************/
842 void srv_cancel_sign_response(uint16 mid
)
844 struct smb_basic_signing_context
*data
;
847 if (!srv_sign_info
.doing_signing
)
850 data
= (struct smb_basic_signing_context
*)srv_sign_info
.signing_context
;
855 DEBUG(10,("srv_cancel_sign_response: for mid %u\n", (unsigned int)mid
));
857 while (get_sequence_for_reply(&data
->outstanding_packet_list
, mid
, &dummy_seq
))
860 /* cancel doesn't send a reply so doesn't burn a sequence number. */
861 data
->send_seq_num
-= 1;
864 /***********************************************************
865 Called by server negprot when signing has been negotiated.
866 ************************************************************/
868 void srv_set_signing_negotiated(void)
870 srv_sign_info
.allow_smb_signing
= True
;
871 srv_sign_info
.negotiated_smb_signing
= True
;
872 if (lp_server_signing() == Required
)
873 srv_sign_info
.mandatory_signing
= True
;
875 srv_sign_info
.sign_outgoing_message
= temp_sign_outgoing_message
;
876 srv_sign_info
.check_incoming_message
= temp_check_incoming_message
;
877 srv_sign_info
.free_signing_context
= temp_free_signing_context
;
880 /***********************************************************
881 Returns whether signing is active. We can't use sendfile or raw
882 reads/writes if it is.
883 ************************************************************/
885 BOOL
srv_is_signing_active(void)
887 return srv_sign_info
.doing_signing
;
891 /***********************************************************
892 Returns whether signing is negotiated. We can't use it unless it was
894 ************************************************************/
896 BOOL
srv_is_signing_negotiated(void)
898 return srv_sign_info
.negotiated_smb_signing
;
901 /***********************************************************
902 Returns whether signing is actually happening
903 ************************************************************/
905 BOOL
srv_signing_started(void)
907 struct smb_basic_signing_context
*data
;
909 if (!srv_sign_info
.doing_signing
) {
913 data
= (struct smb_basic_signing_context
*)srv_sign_info
.signing_context
;
917 if (data
->send_seq_num
== 0) {
924 /***********************************************************
925 Turn on signing from this packet onwards.
926 ************************************************************/
928 void srv_set_signing(const DATA_BLOB user_session_key
, const DATA_BLOB response
)
930 struct smb_basic_signing_context
*data
;
932 if (!user_session_key
.length
)
935 if (!srv_sign_info
.negotiated_smb_signing
&& !srv_sign_info
.mandatory_signing
) {
936 DEBUG(5,("srv_set_signing: signing negotiated = %u, mandatory_signing = %u. Not allowing smb signing.\n",
937 (unsigned int)srv_sign_info
.negotiated_smb_signing
,
938 (unsigned int)srv_sign_info
.mandatory_signing
));
942 /* Once we've turned on, ignore any more sessionsetups. */
943 if (srv_sign_info
.doing_signing
) {
947 if (srv_sign_info
.free_signing_context
)
948 srv_sign_info
.free_signing_context(&srv_sign_info
);
950 srv_sign_info
.doing_signing
= True
;
952 data
= SMB_XMALLOC_P(struct smb_basic_signing_context
);
953 memset(data
, '\0', sizeof(*data
));
955 srv_sign_info
.signing_context
= data
;
957 data
->mac_key
= data_blob(NULL
, response
.length
+ user_session_key
.length
);
959 memcpy(&data
->mac_key
.data
[0], user_session_key
.data
, user_session_key
.length
);
961 memcpy(&data
->mac_key
.data
[user_session_key
.length
],response
.data
, response
.length
);
963 dump_data_pw("MAC ssession key is:\n", data
->mac_key
.data
, data
->mac_key
.length
);
965 DEBUG(3,("srv_set_signing: turning on SMB signing: signing negotiated = %s, mandatory_signing = %s.\n",
966 BOOLSTR(srv_sign_info
.negotiated_smb_signing
),
967 BOOLSTR(srv_sign_info
.mandatory_signing
) ));
969 /* Initialise the sequence number */
970 data
->send_seq_num
= 0;
972 /* Initialise the list of outstanding packets */
973 data
->outstanding_packet_list
= NULL
;
975 srv_sign_info
.sign_outgoing_message
= srv_sign_outgoing_message
;
976 srv_sign_info
.check_incoming_message
= srv_check_incoming_message
;
977 srv_sign_info
.free_signing_context
= simple_free_signing_context
;