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, 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, calc_md5_mac, 8);
413 DEBUG(5, ("client_check_incoming_message: BAD SIG: got SMB signature of\n"));
414 dump_data(5, 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, 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, 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, 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) {
623 if (!set_sequence_can_delete_flag(&data->outstanding_packet_list, mid, False)) {
630 /***********************************************************
631 Leave trans/trans2/nttrans state.
632 ************************************************************/
634 BOOL client_set_trans_sign_state_off(struct cli_state *cli, uint16 mid)
636 uint32 reply_seq_num;
637 struct smb_sign_info *si = &cli->sign_info;
638 struct smb_basic_signing_context *data = (struct smb_basic_signing_context *)si->signing_context;
640 if (!si->doing_signing) {
648 if (!set_sequence_can_delete_flag(&data->outstanding_packet_list, mid, True)) {
652 /* Now delete the stored mid entry. */
653 if (!get_sequence_for_reply(&data->outstanding_packet_list, mid, &reply_seq_num)) {
660 /***********************************************************
661 SMB signing - Server implementation - send the MAC.
662 ************************************************************/
664 static void srv_sign_outgoing_message(char *outbuf, struct smb_sign_info *si)
666 unsigned char calc_md5_mac[16];
667 struct smb_basic_signing_context *data =
668 (struct smb_basic_signing_context *)si->signing_context;
669 uint32 send_seq_number = data->send_seq_num-1;
672 if (!si->doing_signing) {
676 /* JRA Paranioa test - we should be able to get rid of this... */
677 if (smb_len(outbuf) < (smb_ss_field + 8 - 4)) {
678 DEBUG(1, ("srv_sign_outgoing_message: Logic error. Can't send signature on short packet! smb_len = %u\n",
683 /* mark the packet as signed - BEFORE we sign it...*/
684 mark_packet_signed(outbuf);
686 mid = SVAL(outbuf, smb_mid);
688 /* See if this is a reply for a deferred packet. */
689 get_sequence_for_reply(&data->outstanding_packet_list, mid, &send_seq_number);
691 simple_packet_signature(data, (const unsigned char *)outbuf, send_seq_number, calc_md5_mac);
693 DEBUG(10, ("srv_sign_outgoing_message: seq %u: sent SMB signature of\n", (unsigned int)send_seq_number));
694 dump_data(10, calc_md5_mac, 8);
696 memcpy(&outbuf[smb_ss_field], calc_md5_mac, 8);
698 /* cli->outbuf[smb_ss_field+2]=0;
699 Uncomment this to test if the remote client actually verifies signatures...*/
702 /***********************************************************
703 SMB signing - Server implementation - check a MAC sent by server.
704 ************************************************************/
706 static BOOL srv_check_incoming_message(char *inbuf, struct smb_sign_info *si, BOOL must_be_ok)
709 struct smb_basic_signing_context *data =
710 (struct smb_basic_signing_context *)si->signing_context;
711 uint32 reply_seq_number = data->send_seq_num;
713 unsigned char calc_md5_mac[16];
714 unsigned char *server_sent_mac;
716 if (!si->doing_signing)
719 if (smb_len(inbuf) < (smb_ss_field + 8 - 4)) {
720 DEBUG(1, ("srv_check_incoming_message: Can't check signature on short packet! smb_len = %u\n", smb_len(inbuf)));
724 /* We always increment the sequence number. */
725 data->send_seq_num += 2;
727 saved_seq = reply_seq_number;
728 simple_packet_signature(data, (const unsigned char *)inbuf, reply_seq_number, calc_md5_mac);
730 server_sent_mac = (unsigned char *)&inbuf[smb_ss_field];
731 good = (memcmp(server_sent_mac, calc_md5_mac, 8) == 0);
736 DEBUG(0, ("srv_check_incoming_message: BAD SIG: seq %u wanted SMB signature of\n",
737 (unsigned int)saved_seq));
738 dump_data(5, calc_md5_mac, 8);
740 DEBUG(0, ("srv_check_incoming_message: BAD SIG: seq %u got SMB signature of\n",
741 (unsigned int)reply_seq_number));
742 dump_data(5, server_sent_mac, 8);
748 reply_seq_number -= 5;
749 for (i = 0; i < 10; i++, reply_seq_number++) {
750 simple_packet_signature(data, (const unsigned char *)inbuf, reply_seq_number, calc_md5_mac);
751 if (memcmp(server_sent_mac, calc_md5_mac, 8) == 0) {
752 DEBUG(0,("srv_check_incoming_message: out of seq. seq num %u matches. \
753 We were expecting seq %u\n", reply_seq_number, saved_seq ));
761 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));
762 dump_data(10, server_sent_mac, 8);
765 return (signing_good(inbuf, si, good, saved_seq, must_be_ok));
768 /***********************************************************
769 SMB signing - server API's.
770 ************************************************************/
772 static struct smb_sign_info srv_sign_info = {
773 null_sign_outgoing_message,
774 null_check_incoming_message,
775 null_free_signing_context,
783 /***********************************************************
784 Turn signing off or on for oplock break code.
785 ************************************************************/
787 BOOL srv_oplock_set_signing(BOOL onoff)
789 BOOL ret = srv_sign_info.doing_signing;
790 srv_sign_info.doing_signing = onoff;
794 /***********************************************************
795 Called to validate an incoming packet from the client.
796 ************************************************************/
798 BOOL srv_check_sign_mac(char *inbuf, BOOL must_be_ok)
800 /* Check if it's a session keepalive. */
801 if(CVAL(inbuf,0) == SMBkeepalive) {
805 return srv_sign_info.check_incoming_message(inbuf, &srv_sign_info, must_be_ok);
808 /***********************************************************
809 Called to sign an outgoing packet to the client.
810 ************************************************************/
812 void srv_calculate_sign_mac(char *outbuf)
814 /* Check if it's a session keepalive. */
815 if(CVAL(outbuf,0) == SMBkeepalive) {
819 srv_sign_info.sign_outgoing_message(outbuf, &srv_sign_info);
822 /***********************************************************
823 Called by server to defer an outgoing packet.
824 ************************************************************/
826 void srv_defer_sign_response(uint16 mid)
828 struct smb_basic_signing_context *data;
830 if (!srv_sign_info.doing_signing)
833 data = (struct smb_basic_signing_context *)srv_sign_info.signing_context;
839 * Ensure we only store this mid reply once...
842 store_sequence_for_reply(&data->outstanding_packet_list, mid,
843 data->send_seq_num-1);
846 /***********************************************************
847 Called to remove sequence records when a deferred packet is
848 cancelled by mid. This should never find one....
849 ************************************************************/
851 void srv_cancel_sign_response(uint16 mid)
853 struct smb_basic_signing_context *data;
856 if (!srv_sign_info.doing_signing)
859 data = (struct smb_basic_signing_context *)srv_sign_info.signing_context;
864 DEBUG(10,("srv_cancel_sign_response: for mid %u\n", (unsigned int)mid ));
866 while (get_sequence_for_reply(&data->outstanding_packet_list, mid, &dummy_seq))
869 /* cancel doesn't send a reply so doesn't burn a sequence number. */
870 data->send_seq_num -= 1;
873 /***********************************************************
874 Called by server negprot when signing has been negotiated.
875 ************************************************************/
877 void srv_set_signing_negotiated(void)
879 srv_sign_info.allow_smb_signing = True;
880 srv_sign_info.negotiated_smb_signing = True;
881 if (lp_server_signing() == Required)
882 srv_sign_info.mandatory_signing = True;
884 srv_sign_info.sign_outgoing_message = temp_sign_outgoing_message;
885 srv_sign_info.check_incoming_message = temp_check_incoming_message;
886 srv_sign_info.free_signing_context = temp_free_signing_context;
889 /***********************************************************
890 Returns whether signing is active. We can't use sendfile or raw
891 reads/writes if it is.
892 ************************************************************/
894 BOOL srv_is_signing_active(void)
896 return srv_sign_info.doing_signing;
900 /***********************************************************
901 Returns whether signing is negotiated. We can't use it unless it was
903 ************************************************************/
905 BOOL srv_is_signing_negotiated(void)
907 return srv_sign_info.negotiated_smb_signing;
910 /***********************************************************
911 Returns whether signing is actually happening
912 ************************************************************/
914 BOOL srv_signing_started(void)
916 struct smb_basic_signing_context *data;
918 if (!srv_sign_info.doing_signing) {
922 data = (struct smb_basic_signing_context *)srv_sign_info.signing_context;
926 if (data->send_seq_num == 0) {
933 /***********************************************************
934 Turn on signing from this packet onwards.
935 ************************************************************/
937 void srv_set_signing(const DATA_BLOB user_session_key, const DATA_BLOB response)
939 struct smb_basic_signing_context *data;
941 if (!user_session_key.length)
944 if (!srv_sign_info.negotiated_smb_signing && !srv_sign_info.mandatory_signing) {
945 DEBUG(5,("srv_set_signing: signing negotiated = %u, mandatory_signing = %u. Not allowing smb signing.\n",
946 (unsigned int)srv_sign_info.negotiated_smb_signing,
947 (unsigned int)srv_sign_info.mandatory_signing ));
951 /* Once we've turned on, ignore any more sessionsetups. */
952 if (srv_sign_info.doing_signing) {
956 if (srv_sign_info.free_signing_context)
957 srv_sign_info.free_signing_context(&srv_sign_info);
959 srv_sign_info.doing_signing = True;
961 data = SMB_XMALLOC_P(struct smb_basic_signing_context);
962 memset(data, '\0', sizeof(*data));
964 srv_sign_info.signing_context = data;
966 data->mac_key = data_blob(NULL, response.length + user_session_key.length);
968 memcpy(&data->mac_key.data[0], user_session_key.data, user_session_key.length);
970 memcpy(&data->mac_key.data[user_session_key.length],response.data, response.length);
972 dump_data_pw("MAC ssession key is:\n", data->mac_key.data, data->mac_key.length);
974 DEBUG(3,("srv_set_signing: turning on SMB signing: signing negotiated = %s, mandatory_signing = %s.\n",
975 BOOLSTR(srv_sign_info.negotiated_smb_signing),
976 BOOLSTR(srv_sign_info.mandatory_signing) ));
978 /* Initialise the sequence number */
979 data->send_seq_num = 0;
981 /* Initialise the list of outstanding packets */
982 data->outstanding_packet_list = NULL;
984 srv_sign_info.sign_outgoing_message = srv_sign_outgoing_message;
985 srv_sign_info.check_incoming_message = srv_check_incoming_message;
986 srv_sign_info.free_signing_context = simple_free_signing_context;