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 {
28 struct outstanding_packet_lookup *prev, *next;
31 /* Store the data for an ongoing trans/trans2/nttrans operation. */
32 struct trans_info_context {
38 struct smb_basic_signing_context {
41 struct trans_info_context *trans_info;
42 struct outstanding_packet_lookup *outstanding_packet_list;
45 static void store_sequence_for_reply(struct outstanding_packet_lookup **list,
46 uint16 mid, uint32 reply_seq_num)
48 struct outstanding_packet_lookup *t;
49 struct outstanding_packet_lookup *tmp;
51 t = smb_xmalloc(sizeof(*t));
54 DLIST_ADD_END(*list, t, tmp);
56 t->reply_seq_num = reply_seq_num;
58 DEBUG(10,("store_sequence_for_reply: stored seq = %u mid = %u\n",
59 (unsigned int)reply_seq_num, (unsigned int)mid ));
62 static BOOL get_sequence_for_reply(struct outstanding_packet_lookup **list,
63 uint16 mid, uint32 *reply_seq_num)
65 struct outstanding_packet_lookup *t;
67 for (t = *list; t; t = t->next) {
69 *reply_seq_num = t->reply_seq_num;
70 DEBUG(10,("get_sequence_for_reply: found seq = %u mid = %u\n",
71 (unsigned int)t->reply_seq_num, (unsigned int)t->mid ));
72 DLIST_REMOVE(*list, t);
80 /***********************************************************
81 SMB signing - Common code before we set a new signing implementation
82 ************************************************************/
84 static BOOL cli_set_smb_signing_common(struct cli_state *cli)
86 if (!cli->sign_info.negotiated_smb_signing
87 && !cli->sign_info.mandatory_signing) {
91 if (cli->sign_info.doing_signing) {
95 if (cli->sign_info.free_signing_context)
96 cli->sign_info.free_signing_context(&cli->sign_info);
98 /* These calls are INCOMPATIBLE with SMB signing */
99 cli->readbraw_supported = False;
100 cli->writebraw_supported = False;
105 /***********************************************************
106 SMB signing - Common code for 'real' implementations
107 ************************************************************/
109 static BOOL set_smb_signing_real_common(struct smb_sign_info *si)
111 if (si->mandatory_signing) {
112 DEBUG(5, ("Mandatory SMB signing enabled!\n"));
115 si->doing_signing = True;
116 DEBUG(5, ("SMB signing enabled!\n"));
121 static void mark_packet_signed(char *outbuf)
124 flags2 = SVAL(outbuf,smb_flg2);
125 flags2 |= FLAGS2_SMB_SECURITY_SIGNATURES;
126 SSVAL(outbuf,smb_flg2, flags2);
129 /***********************************************************
130 SMB signing - NULL implementation - calculate a MAC to send.
131 ************************************************************/
133 static void null_sign_outgoing_message(char *outbuf, struct smb_sign_info *si)
135 /* we can't zero out the sig, as we might be trying to send a
136 session request - which is NBT-level, not SMB level and doesn't
141 /***********************************************************
142 SMB signing - NULL implementation - check a MAC sent by server.
143 ************************************************************/
145 static BOOL null_check_incoming_message(char *inbuf, struct smb_sign_info *si)
150 /***********************************************************
151 SMB signing - NULL implementation - free signing context
152 ************************************************************/
154 static void null_free_signing_context(struct smb_sign_info *si)
160 SMB signing - NULL implementation - setup the MAC key.
162 @note Used as an initialisation only - it will not correctly
163 shut down a real signing mechanism
166 static BOOL null_set_signing(struct smb_sign_info *si)
168 si->signing_context = NULL;
170 si->sign_outgoing_message = null_sign_outgoing_message;
171 si->check_incoming_message = null_check_incoming_message;
172 si->free_signing_context = null_free_signing_context;
178 * Free the signing context
181 static void free_signing_context(struct smb_sign_info *si)
183 if (si->free_signing_context) {
184 si->free_signing_context(si);
185 si->signing_context = NULL;
188 null_set_signing(si);
192 static BOOL signing_good(char *inbuf, struct smb_sign_info *si, BOOL good, uint32 seq)
194 if (good && !si->doing_signing) {
195 si->doing_signing = True;
199 if (si->doing_signing) {
200 struct smb_basic_signing_context *data = si->signing_context;
202 /* W2K sends a bad first signature but the sign engine is on.... JRA. */
203 if (data->send_seq_num > 1)
204 DEBUG(1, ("signing_good: SMB signature check failed on seq %u!\n",
205 (unsigned int)seq ));
209 DEBUG(3, ("signing_good: Peer did not sign reply correctly\n"));
210 free_signing_context(si);
217 /***********************************************************
218 SMB signing - Simple implementation - calculate a MAC on the packet
219 ************************************************************/
221 static void simple_packet_signature(struct smb_basic_signing_context *data,
222 const uchar *buf, uint32 seq_number,
223 unsigned char calc_md5_mac[16])
225 const size_t offset_end_of_sig = (smb_ss_field + 8);
226 unsigned char sequence_buf[8];
227 struct MD5Context md5_ctx;
230 * Firstly put the sequence number into the first 4 bytes.
231 * and zero out the next 4 bytes.
233 * We do this here, to avoid modifying the packet.
236 DEBUG(10,("simple_packet_signature: sequence number %u\n", seq_number ));
238 SIVAL(sequence_buf, 0, seq_number);
239 SIVAL(sequence_buf, 4, 0);
241 /* Calculate the 16 byte MAC - but don't alter the data in the
244 This makes for a bit of fussing about, but it's not too bad.
248 /* intialise with the key */
249 MD5Update(&md5_ctx, data->mac_key.data,
250 data->mac_key.length);
252 /* copy in the first bit of the SMB header */
253 MD5Update(&md5_ctx, buf + 4, smb_ss_field - 4);
255 /* copy in the sequence number, instead of the signature */
256 MD5Update(&md5_ctx, sequence_buf, sizeof(sequence_buf));
258 /* copy in the rest of the packet in, skipping the signature */
259 MD5Update(&md5_ctx, buf + offset_end_of_sig,
260 smb_len(buf) - (offset_end_of_sig - 4));
262 /* calculate the MD5 sig */
263 MD5Final(calc_md5_mac, &md5_ctx);
267 /***********************************************************
268 SMB signing - Client implementation - send the MAC.
269 ************************************************************/
271 static void client_sign_outgoing_message(char *outbuf, struct smb_sign_info *si)
273 unsigned char calc_md5_mac[16];
274 struct smb_basic_signing_context *data = si->signing_context;
277 if (!si->doing_signing)
280 /* JRA Paranioa test - we should be able to get rid of this... */
281 if (smb_len(outbuf) < (smb_ss_field + 8 - 4)) {
282 DEBUG(1, ("client_sign_outgoing_message: Logic error. Can't check signature on short packet! smb_len = %u\n",
287 /* mark the packet as signed - BEFORE we sign it...*/
288 mark_packet_signed(outbuf);
290 if (data->trans_info)
291 send_seq_num = data->trans_info->send_seq_num;
293 send_seq_num = data->send_seq_num;
295 simple_packet_signature(data, (const unsigned char *)outbuf, send_seq_num, calc_md5_mac);
297 DEBUG(10, ("client_sign_outgoing_message: sent SMB signature of\n"));
298 dump_data(10, (const char *)calc_md5_mac, 8);
300 memcpy(&outbuf[smb_ss_field], calc_md5_mac, 8);
302 /* cli->outbuf[smb_ss_field+2]=0;
303 Uncomment this to test if the remote server actually verifies signatures...*/
305 if (data->trans_info)
308 data->send_seq_num++;
309 store_sequence_for_reply(&data->outstanding_packet_list,
310 SVAL(outbuf,smb_mid), data->send_seq_num);
311 data->send_seq_num++;
314 /***********************************************************
315 SMB signing - Client implementation - check a MAC sent by server.
316 ************************************************************/
318 static BOOL client_check_incoming_message(char *inbuf, struct smb_sign_info *si)
321 uint32 reply_seq_number;
323 unsigned char calc_md5_mac[16];
324 unsigned char *server_sent_mac;
326 struct smb_basic_signing_context *data = si->signing_context;
328 if (!si->doing_signing)
331 if (smb_len(inbuf) < (smb_ss_field + 8 - 4)) {
332 DEBUG(1, ("client_check_incoming_message: Can't check signature on short packet! smb_len = %u\n", smb_len(inbuf)));
336 if (data->trans_info) {
337 reply_seq_number = data->trans_info->reply_seq_num;
338 } else if (!get_sequence_for_reply(&data->outstanding_packet_list,
339 SVAL(inbuf, smb_mid), &reply_seq_number)) {
340 DEBUG(1, ("client_check_incoming_message: failed to get sequence number %u for reply.\n",
341 (unsigned int) SVAL(inbuf, smb_mid) ));
345 saved_seq = reply_seq_number;
346 simple_packet_signature(data, (const unsigned char *)inbuf, reply_seq_number, calc_md5_mac);
348 server_sent_mac = (unsigned char *)&inbuf[smb_ss_field];
349 good = (memcmp(server_sent_mac, calc_md5_mac, 8) == 0);
352 DEBUG(5, ("client_check_incoming_message: BAD SIG: wanted SMB signature of\n"));
353 dump_data(5, (const char *)calc_md5_mac, 8);
355 DEBUG(5, ("client_check_incoming_message: BAD SIG: got SMB signature of\n"));
356 dump_data(5, (const char *)server_sent_mac, 8);
360 reply_seq_number -= 5;
361 for (i = 0; i < 10; i++, reply_seq_number++) {
362 simple_packet_signature(data, (const unsigned char *)inbuf, reply_seq_number, calc_md5_mac);
363 if (memcmp(server_sent_mac, calc_md5_mac, 8) == 0) {
364 DEBUG(0,("client_check_incoming_message: out of seq. seq num %u matches. \
365 We were expecting seq %u\n", reply_seq_number, saved_seq ));
373 DEBUG(10, ("client_check_incoming_message:: seq %u: got good SMB signature of\n", (unsigned int)reply_seq_number));
374 dump_data(10, (const char *)server_sent_mac, 8);
376 return signing_good(inbuf, si, good, saved_seq);
379 /***********************************************************
380 SMB signing - Simple implementation - free signing context
381 ************************************************************/
383 static void simple_free_signing_context(struct smb_sign_info *si)
385 struct smb_basic_signing_context *data = si->signing_context;
386 struct outstanding_packet_lookup *list = data->outstanding_packet_list;
389 struct outstanding_packet_lookup *old_head = list;
390 DLIST_REMOVE(list, list);
394 data_blob_free(&data->mac_key);
396 if (data->trans_info)
397 SAFE_FREE(data->trans_info);
399 SAFE_FREE(si->signing_context);
404 /***********************************************************
405 SMB signing - Simple implementation - setup the MAC key.
406 ************************************************************/
408 BOOL cli_simple_set_signing(struct cli_state *cli, const DATA_BLOB user_session_key, const DATA_BLOB response)
410 struct smb_basic_signing_context *data;
412 if (!user_session_key.length)
415 if (!cli_set_smb_signing_common(cli)) {
419 if (!set_smb_signing_real_common(&cli->sign_info)) {
423 data = smb_xmalloc(sizeof(*data));
424 memset(data, '\0', sizeof(*data));
426 cli->sign_info.signing_context = data;
428 data->mac_key = data_blob(NULL, response.length + user_session_key.length);
430 memcpy(&data->mac_key.data[0], user_session_key.data, user_session_key.length);
432 DEBUG(10, ("cli_simple_set_signing: user_session_key\n"));
433 dump_data(10, (const char *)user_session_key.data, user_session_key.length);
435 if (response.length) {
436 memcpy(&data->mac_key.data[user_session_key.length],response.data, response.length);
437 DEBUG(10, ("cli_simple_set_signing: response_data\n"));
438 dump_data(10, (const char *)response.data, response.length);
440 DEBUG(10, ("cli_simple_set_signing: NULL response_data\n"));
443 dump_data_pw("MAC ssession key is:\n", data->mac_key.data, data->mac_key.length);
445 /* Initialise the sequence number */
446 data->send_seq_num = 0;
448 /* Initialise the list of outstanding packets */
449 data->outstanding_packet_list = NULL;
451 cli->sign_info.sign_outgoing_message = client_sign_outgoing_message;
452 cli->sign_info.check_incoming_message = client_check_incoming_message;
453 cli->sign_info.free_signing_context = simple_free_signing_context;
458 /***********************************************************
459 Tell client code we are in a multiple trans reply state.
460 ************************************************************/
462 void cli_signing_trans_start(struct cli_state *cli)
464 struct smb_basic_signing_context *data = cli->sign_info.signing_context;
466 if (!cli->sign_info.doing_signing || !data)
469 data->trans_info = smb_xmalloc(sizeof(struct trans_info_context));
470 ZERO_STRUCTP(data->trans_info);
472 data->trans_info->send_seq_num = data->send_seq_num;
473 data->trans_info->mid = SVAL(cli->outbuf,smb_mid);
474 data->trans_info->reply_seq_num = data->send_seq_num+1;
476 DEBUG(10,("cli_signing_trans_start: storing mid = %u, reply_seq_num = %u, send_seq_num = %u \
477 data->send_seq_num = %u\n",
478 (unsigned int)data->trans_info->mid,
479 (unsigned int)data->trans_info->reply_seq_num,
480 (unsigned int)data->trans_info->send_seq_num,
481 (unsigned int)data->send_seq_num ));
484 /***********************************************************
485 Tell client code we are out of a multiple trans reply state.
486 ************************************************************/
488 void cli_signing_trans_stop(struct cli_state *cli)
490 struct smb_basic_signing_context *data = cli->sign_info.signing_context;
492 if (!cli->sign_info.doing_signing || !data)
495 SAFE_FREE(data->trans_info);
496 data->trans_info = NULL;
498 data->send_seq_num += 2;
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)
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)) {
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 = si->signing_context;
599 uint32 send_seq_number = data->send_seq_num;
600 BOOL was_deferred_packet = False;
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 was_deferred_packet = get_sequence_for_reply(&data->outstanding_packet_list, mid, &send_seq_number);
622 if (data->trans_info && (data->trans_info->mid == mid)) {
623 /* This is a reply in a trans stream. Use the sequence
624 * number associated with the stream mid. */
625 send_seq_number = data->trans_info->send_seq_num;
628 simple_packet_signature(data, (const unsigned char *)outbuf, send_seq_number, calc_md5_mac);
630 DEBUG(10, ("srv_sign_outgoing_message: seq %u: sent SMB signature of\n", (unsigned int)send_seq_number));
631 dump_data(10, (const char *)calc_md5_mac, 8);
633 memcpy(&outbuf[smb_ss_field], calc_md5_mac, 8);
635 /* cli->outbuf[smb_ss_field+2]=0;
636 Uncomment this to test if the remote client actually verifies signatures...*/
638 /* Don't mess with the sequence number for a deferred packet. */
639 if (was_deferred_packet) {
643 if (!data->trans_info) {
644 /* Always increment if not in a trans stream. */
645 data->send_seq_num++;
646 } else if ((data->trans_info->send_seq_num == data->send_seq_num) || (data->trans_info->mid != mid)) {
647 /* Increment if this is the first reply in a trans stream or a
648 * packet that doesn't belong to this stream (different mid). */
649 data->send_seq_num++;
653 /***********************************************************
654 Is an incoming packet an oplock break reply ?
655 ************************************************************/
657 static BOOL is_oplock_break(char *inbuf)
659 if (CVAL(inbuf,smb_com) != SMBlockingX)
662 if (!(CVAL(inbuf,smb_vwv3) & LOCKING_ANDX_OPLOCK_RELEASE))
665 DEBUG(10,("is_oplock_break: Packet is oplock break\n"));
669 /***********************************************************
670 SMB signing - Server implementation - check a MAC sent by server.
671 ************************************************************/
673 static BOOL srv_check_incoming_message(char *inbuf, struct smb_sign_info *si)
676 struct smb_basic_signing_context *data = si->signing_context;
677 uint32 reply_seq_number = data->send_seq_num;
679 unsigned char calc_md5_mac[16];
680 unsigned char *server_sent_mac;
683 if (!si->doing_signing)
686 if (smb_len(inbuf) < (smb_ss_field + 8 - 4)) {
687 DEBUG(1, ("srv_check_incoming_message: Can't check signature on short packet! smb_len = %u\n", smb_len(inbuf)));
691 mid = SVAL(inbuf, smb_mid);
693 /* Is this part of a trans stream ? */
694 if (data->trans_info && (data->trans_info->mid == mid)) {
695 /* If so we don't increment the sequence. */
696 reply_seq_number = data->trans_info->reply_seq_num;
698 /* We always increment the sequence number. */
699 data->send_seq_num++;
701 /* If we get an asynchronous oplock break reply and there
702 * isn't a reply pending we need to re-sync the sequence
705 if (is_oplock_break(inbuf)) {
706 DEBUG(10,("srv_check_incoming_message: oplock break at seq num %u\n", data->send_seq_num));
707 data->send_seq_num++;
711 saved_seq = reply_seq_number;
712 simple_packet_signature(data, (const unsigned char *)inbuf, reply_seq_number, calc_md5_mac);
714 server_sent_mac = (unsigned char *)&inbuf[smb_ss_field];
715 good = (memcmp(server_sent_mac, calc_md5_mac, 8) == 0);
719 DEBUG(5, ("srv_check_incoming_message: BAD SIG: seq %u wanted SMB signature of\n",
720 (unsigned int)saved_seq));
721 dump_data(5, (const char *)calc_md5_mac, 8);
723 DEBUG(5, ("srv_check_incoming_message: BAD SIG: seq %u got SMB signature of\n",
724 (unsigned int)saved_seq));
725 dump_data(5, (const char *)server_sent_mac, 8);
730 reply_seq_number -= 5;
731 for (i = 0; i < 10; i++, reply_seq_number++) {
732 simple_packet_signature(data, (const unsigned char *)inbuf, reply_seq_number, calc_md5_mac);
733 if (memcmp(server_sent_mac, calc_md5_mac, 8) == 0) {
734 DEBUG(0,("srv_check_incoming_message: out of seq. seq num %u matches. \
735 We were expecting seq %u\n", reply_seq_number, saved_seq ));
743 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));
744 dump_data(10, (const char *)server_sent_mac, 8);
746 return signing_good(inbuf, si, good, saved_seq);
749 /***********************************************************
750 SMB signing - server API's.
751 ************************************************************/
753 static struct smb_sign_info srv_sign_info = {
754 null_sign_outgoing_message,
755 null_check_incoming_message,
756 null_free_signing_context,
764 /***********************************************************
765 Turn signing off or on for oplock break code.
766 ************************************************************/
768 BOOL srv_oplock_set_signing(BOOL onoff)
770 BOOL ret = srv_sign_info.doing_signing;
771 srv_sign_info.doing_signing = onoff;
775 /***********************************************************
776 Called to validate an incoming packet from the client.
777 ************************************************************/
779 BOOL srv_check_sign_mac(char *inbuf)
781 /* Check if it's a session keepalive. */
782 if(CVAL(inbuf,0) == SMBkeepalive)
785 return srv_sign_info.check_incoming_message(inbuf, &srv_sign_info);
788 /***********************************************************
789 Called to sign an outgoing packet to the client.
790 ************************************************************/
792 void srv_calculate_sign_mac(char *outbuf)
794 /* Check if it's a session keepalive. */
795 /* JRA Paranioa test - do we ever generate these in the server ? */
796 if(CVAL(outbuf,0) == SMBkeepalive)
799 srv_sign_info.sign_outgoing_message(outbuf, &srv_sign_info);
802 /***********************************************************
803 Called by server to defer an outgoing packet.
804 ************************************************************/
806 void srv_defer_sign_response(uint16 mid)
808 struct smb_basic_signing_context *data;
810 if (!srv_sign_info.doing_signing)
813 data = (struct smb_basic_signing_context *)srv_sign_info.signing_context;
818 store_sequence_for_reply(&data->outstanding_packet_list,
819 mid, data->send_seq_num);
820 data->send_seq_num++;
823 /***********************************************************
824 Called to remove sequence records when a deferred packet is
825 cancelled by mid. This should never find one....
826 ************************************************************/
828 void srv_cancel_sign_response(uint16 mid)
830 struct smb_basic_signing_context *data;
833 if (!srv_sign_info.doing_signing)
836 data = (struct smb_basic_signing_context *)srv_sign_info.signing_context;
841 DEBUG(10,("srv_cancel_sign_response: for mid %u\n", (unsigned int)mid ));
843 while (get_sequence_for_reply(&data->outstanding_packet_list, mid, &dummy_seq))
847 /***********************************************************
848 Called by server negprot when signing has been negotiated.
849 ************************************************************/
851 void srv_set_signing_negotiated(void)
853 srv_sign_info.allow_smb_signing = True;
854 srv_sign_info.negotiated_smb_signing = True;
855 if (lp_server_signing() == Required)
856 srv_sign_info.mandatory_signing = True;
858 srv_sign_info.sign_outgoing_message = temp_sign_outgoing_message;
859 srv_sign_info.check_incoming_message = temp_check_incoming_message;
860 srv_sign_info.free_signing_context = temp_free_signing_context;
863 /***********************************************************
864 Returns whether signing is active. We can't use sendfile or raw
865 reads/writes if it is.
866 ************************************************************/
868 BOOL srv_is_signing_active(void)
870 return srv_sign_info.doing_signing;
873 /***********************************************************
874 Tell server code we are in a multiple trans reply state.
875 ************************************************************/
877 void srv_signing_trans_start(uint16 mid)
879 struct smb_basic_signing_context *data;
881 if (!srv_sign_info.doing_signing)
884 data = (struct smb_basic_signing_context *)srv_sign_info.signing_context;
888 data->trans_info = smb_xmalloc(sizeof(struct trans_info_context));
889 ZERO_STRUCTP(data->trans_info);
891 data->trans_info->reply_seq_num = data->send_seq_num-1;
892 data->trans_info->mid = mid;
893 data->trans_info->send_seq_num = data->send_seq_num;
895 DEBUG(10,("srv_signing_trans_start: storing mid = %u, reply_seq_num = %u, send_seq_num = %u \
896 data->send_seq_num = %u\n",
898 (unsigned int)data->trans_info->reply_seq_num,
899 (unsigned int)data->trans_info->send_seq_num,
900 (unsigned int)data->send_seq_num ));
903 /***********************************************************
904 Tell server code we are out of a multiple trans reply state.
905 ************************************************************/
907 void srv_signing_trans_stop(void)
909 struct smb_basic_signing_context *data;
911 if (!srv_sign_info.doing_signing)
914 data = (struct smb_basic_signing_context *)srv_sign_info.signing_context;
915 if (!data || !data->trans_info)
918 DEBUG(10,("srv_signing_trans_stop: removing mid = %u, reply_seq_num = %u, send_seq_num = %u \
919 data->send_seq_num = %u\n",
920 (unsigned int)data->trans_info->mid,
921 (unsigned int)data->trans_info->reply_seq_num,
922 (unsigned int)data->trans_info->send_seq_num,
923 (unsigned int)data->send_seq_num ));
925 SAFE_FREE(data->trans_info);
926 data->trans_info = NULL;
929 /***********************************************************
930 Turn on signing from this packet onwards.
931 ************************************************************/
933 void srv_set_signing(const DATA_BLOB user_session_key, const DATA_BLOB response)
935 struct smb_basic_signing_context *data;
937 if (!user_session_key.length)
940 if (!srv_sign_info.negotiated_smb_signing && !srv_sign_info.mandatory_signing) {
941 DEBUG(5,("srv_set_signing: signing negotiated = %u, mandatory_signing = %u. Not allowing smb signing.\n",
942 (unsigned int)srv_sign_info.negotiated_smb_signing,
943 (unsigned int)srv_sign_info.mandatory_signing ));
947 /* Once we've turned on, ignore any more sessionsetups. */
948 if (srv_sign_info.doing_signing) {
952 if (srv_sign_info.free_signing_context)
953 srv_sign_info.free_signing_context(&srv_sign_info);
955 srv_sign_info.doing_signing = True;
957 data = smb_xmalloc(sizeof(*data));
958 memset(data, '\0', sizeof(*data));
960 srv_sign_info.signing_context = data;
962 data->mac_key = data_blob(NULL, response.length + user_session_key.length);
964 memcpy(&data->mac_key.data[0], user_session_key.data, user_session_key.length);
966 memcpy(&data->mac_key.data[user_session_key.length],response.data, response.length);
968 dump_data_pw("MAC ssession key is:\n", data->mac_key.data, data->mac_key.length);
970 /* Initialise the sequence number */
971 data->send_seq_num = 0;
973 /* Initialise the list of outstanding packets */
974 data->outstanding_packet_list = NULL;
976 srv_sign_info.sign_outgoing_message = srv_sign_outgoing_message;
977 srv_sign_info.check_incoming_message = srv_check_incoming_message;
978 srv_sign_info.free_signing_context = simple_free_signing_context;