summaryrefslogtreecommitdiff
path: root/source3/nsswitch/winbindd_cm.c
blob: 832672e64cbda72012a564a92a0d4ec7ba1cb0ef (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
/* 
   Unix SMB/CIFS implementation.

   Winbind daemon connection manager

   Copyright (C) Tim Potter 2001
   Copyright (C) Andrew Bartlett 2002
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/*
   We need to manage connections to domain controllers without having to
   mess up the main winbindd code with other issues.  The aim of the
   connection manager is to:
  
       - make connections to domain controllers and cache them
       - re-establish connections when networks or servers go down
       - centralise the policy on connection timeouts, domain controller
	 selection etc
       - manage re-entrancy for when winbindd becomes able to handle
	 multiple outstanding rpc requests
  
   Why not have connection management as part of the rpc layer like tng?
   Good question.  This code may morph into libsmb/rpc_cache.c or something
   like that but at the moment it's simply staying as part of winbind.	I
   think the TNG architecture of forcing every user of the rpc layer to use
   the connection caching system is a bad idea.	 It should be an optional
   method of using the routines.

   The TNG design is quite good but I disagree with some aspects of the
   implementation. -tpot

 */

/*
   TODO:

     - I'm pretty annoyed by all the make_nmb_name() stuff.  It should be
       moved down into another function.

     - Take care when destroying cli_structs as they can be shared between
       various sam handles.

 */

#include "includes.h"
#include "winbindd.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_WINBIND

/* Global list of connections.	Initially a DLIST but can become a hash
   table or whatever later. */

struct winbindd_cm_conn {
	struct winbindd_cm_conn *prev, *next;
	fstring domain;
	fstring controller;
	fstring pipe_name;
	struct cli_state *cli;
	POLICY_HND pol;
};

static struct winbindd_cm_conn *cm_conns = NULL;

static NTSTATUS get_connection_from_cache(struct winbindd_domain *domain,
					  const char *pipe_name,
					  struct winbindd_cm_conn **conn_out);

/* Choose between anonymous or authenticated connections.  We need to use
   an authenticated connection if DCs have the RestrictAnonymous registry
   entry set > 0, or the "Additional restrictions for anonymous
   connections" set in the win2k Local Security Policy. 
   
   Caller to free() result in domain, username, password
*/

static void cm_get_ipc_userpass(char **username, char **domain, char **password)
{
	*username = secrets_fetch(SECRETS_AUTH_USER, NULL);
	*domain = secrets_fetch(SECRETS_AUTH_DOMAIN, NULL);
	*password = secrets_fetch(SECRETS_AUTH_PASSWORD, NULL);
	
	if (*username && **username) {

		if (!*domain || !**domain)
			*domain = smb_xstrdup(lp_workgroup());
		
		if (!*password || !**password)
			*password = smb_xstrdup("");

		DEBUG(3, ("cm_get_ipc_userpass: Retrieved auth-user from secrets.tdb [%s\\%s]\n", 
			  *domain, *username));

	} else {
		DEBUG(3, ("cm_get_ipc_userpass: No auth-user defined\n"));
		*username = smb_xstrdup("");
		*domain = smb_xstrdup("");
		*password = smb_xstrdup("");
	}
}

/*
  setup for schannel on any pipes opened on this connection
*/
static NTSTATUS setup_schannel( struct cli_state *cli, const char *domain )
{
	NTSTATUS ret;
	uchar trust_password[16];
	uint32 sec_channel_type;
	DOM_SID sid;
	time_t lct;

	/* use the domain trust password if we're on a DC 
	   and this is not our domain */
	
	if ( IS_DC && !strequal(domain, lp_workgroup()) ) {
		char *pass = NULL;
		
		if ( !secrets_fetch_trusted_domain_password( domain, 
			&pass, &sid, &lct) )
		{
			return NT_STATUS_UNSUCCESSFUL;
		}	

		sec_channel_type = SEC_CHAN_DOMAIN;
		E_md4hash(pass, trust_password);
		SAFE_FREE( pass );
		
	} else {
		if (!secrets_fetch_trust_account_password(lp_workgroup(),
			trust_password, NULL, &sec_channel_type)) 
		{
			return NT_STATUS_UNSUCCESSFUL;
		}
	}

	ret = cli_nt_setup_netsec(cli, sec_channel_type, 
		AUTH_PIPE_NETSEC | AUTH_PIPE_SIGN, trust_password);

	return ret;
}

static BOOL get_dc_name_via_netlogon(const struct winbindd_domain *domain,
				     fstring dcname, struct in_addr *dc_ip)
{
	struct winbindd_domain *our_domain;
	NTSTATUS result;
	struct winbindd_cm_conn *conn;
	TALLOC_CTX *mem_ctx;

	fstring tmp;
	char *p;

	if (IS_DC)
		return False;

	if (domain->primary)
		return False;

	if ((our_domain = find_our_domain()) == NULL)
		return False;

	result = get_connection_from_cache(our_domain, PIPE_NETLOGON, &conn);
	if (!NT_STATUS_IS_OK(result))
		return False;

	if ((mem_ctx = talloc_init("get_dc_name_via_netlogon")) == NULL)
		return False;

	result = cli_netlogon_getdcname(conn->cli, mem_ctx, domain->name, tmp);

	talloc_destroy(mem_ctx);

	if (!NT_STATUS_IS_OK(result))
		return False;

	/* cli_netlogon_getdcname gives us a name with \\ */
	p = tmp;
	if (*p == '\\') p+=1;
	if (*p == '\\') p+=1;

	fstrcpy(dcname, p);

	if (!resolve_name(dcname, dc_ip, 0x20))
		return False;

	return True;
}

/************************************************************************
 Given a fd with a just-connected TCP connection to a DC, open a connection
 to the pipe.
************************************************************************/

static NTSTATUS cm_prepare_connection(const struct winbindd_domain *domain,
				      const int sockfd,
				      const int pipe_index,
				      const char *controller,
				      struct cli_state **cli,
				      BOOL *retry)
{
	char *machine_password, *machine_krb5_principal;
	char *ipc_username, *ipc_domain, *ipc_password;

	BOOL got_mutex;
	BOOL add_failed_connection = True;

	NTSTATUS result = NT_STATUS_UNSUCCESSFUL;

	struct sockaddr peeraddr;
	socklen_t peeraddr_len;

	struct sockaddr_in *peeraddr_in = (struct sockaddr_in *)&peeraddr;

	machine_password = secrets_fetch_machine_password(lp_workgroup(), NULL,
							  NULL);
	
	if (asprintf(&machine_krb5_principal, "%s$@%s", global_myname(),
		     lp_realm()) == -1) {
		SAFE_FREE(machine_password);
		return NT_STATUS_NO_MEMORY;
	}

	cm_get_ipc_userpass(&ipc_username, &ipc_domain, &ipc_password);

	*retry = True;

	got_mutex = secrets_named_mutex(controller,
					WINBIND_SERVER_MUTEX_WAIT_TIME);

	if (!got_mutex) {
		DEBUG(0,("cm_open_connection: mutex grab failed for %s\n",
			 controller));
		result = NT_STATUS_POSSIBLE_DEADLOCK;
		goto done;
	}

	if ((*cli = cli_initialise(NULL)) == NULL) {
		DEBUG(1, ("Could not cli_initialize\n"));
		result = NT_STATUS_NO_MEMORY;
		goto done;
	}

	(*cli)->timeout = 10000; 	/* 10 seconds */
	(*cli)->fd = sockfd;
	fstrcpy((*cli)->desthost, controller);
	(*cli)->use_kerberos = True;

	peeraddr_len = sizeof(peeraddr);

	if ((getpeername((*cli)->fd, &peeraddr, &peeraddr_len) != 0) ||
	    (peeraddr_len != sizeof(struct sockaddr_in)) ||
	    (peeraddr_in->sin_family != PF_INET))
	{
		DEBUG(0,("cm_prepare_connection: %s\n", strerror(errno)));
		goto done;
	}

	if (ntohs(peeraddr_in->sin_port) == 139) {
		struct nmb_name calling;
		struct nmb_name called;

		make_nmb_name(&calling, global_myname(), 0x0);
		make_nmb_name(&called, "*SMBSERVER", 0x20);

		if (!cli_session_request(*cli, &calling, &called)) {
			DEBUG(8, ("cli_session_request failed for %s\n",
				  controller));
			goto done;
		}
	}

	cli_setup_signing_state(*cli, Undefined);

	if (!cli_negprot(*cli)) {
		DEBUG(1, ("cli_negprot failed\n"));
		cli_shutdown(*cli);
		goto done;
	}

	/* Krb5 session */
			
	if ((lp_security() == SEC_ADS) 
	    && ((*cli)->protocol >= PROTOCOL_NT1 &&
		(*cli)->capabilities & CAP_EXTENDED_SECURITY)) {

		ADS_STATUS ads_status;
		(*cli)->use_kerberos = True;
		DEBUG(5, ("connecting to %s from %s with kerberos principal "
			  "[%s]\n", controller, global_myname(),
			  machine_krb5_principal));

		ads_status = cli_session_setup_spnego(*cli,
						      machine_krb5_principal, 
						      machine_password, 
						      lp_workgroup());

		if (!ADS_ERR_OK(ads_status))
			DEBUG(4,("failed kerberos session setup with %s\n",
				 ads_errstr(ads_status)));

		result = ads_ntstatus(ads_status);
	}

	if (NT_STATUS_IS_OK(result))
		goto session_setup_done;

	/* Fall back to non-kerberos session setup */

	(*cli)->use_kerberos = False;

	if ((((*cli)->sec_mode & NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) != 0) &&
	    (strlen(ipc_username) > 0)) {

		/* Only try authenticated if we have a username */

		DEBUG(5, ("connecting to %s from %s with username "
			  "[%s]\\[%s]\n",  controller, global_myname(),
			  ipc_domain, ipc_username));

		if (cli_session_setup(*cli, ipc_username,
				      ipc_password, strlen(ipc_password)+1,
				      ipc_password, strlen(ipc_password)+1,
				      ipc_domain)) {
			DEBUG(5, ("authenticated session setup failed\n"));
			goto session_setup_done;
		}
	}

	/* Fall back to anonymous connection, this might fail later */

	if (cli_session_setup(*cli, "", NULL, 0, NULL, 0, "")) {
		DEBUG(5, ("Connected anonymously\n"));
		goto session_setup_done;
	}

	result = cli_nt_error(*cli);

	if (NT_STATUS_IS_OK(result))
		result = NT_STATUS_UNSUCCESSFUL;

	/* We can't session setup */

	goto done;

 session_setup_done:

	if (!cli_send_tconX(*cli, "IPC$", "IPC", "", 0)) {

		result = cli_nt_error(*cli);

		DEBUG(1,("failed tcon_X with %s\n", nt_errstr(result)));

		if (NT_STATUS_IS_OK(result))
			result = NT_STATUS_UNSUCCESSFUL;

		cli_shutdown(*cli);
		goto done;
	}

	secrets_named_mutex_release(controller);
	got_mutex = False;
	*retry = False;

	/* Windows 2003 SP1 does not lie LsaOpenPolicy() over schannel.
	   Returns RPC_NT_CANNOT_SUPPPORT (0xc0020041) for that call.
	   So just drop it on the lsarpc pipe */

	if ( (domain->primary || IS_DC) && (pipe_index!=PI_LSARPC) ) {
		NTSTATUS status = setup_schannel( *cli, domain->name );
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(3,("schannel refused - continuing without "
				 "schannel (%s)\n", nt_errstr(status)));
		}
	}

	/* set the domain if empty; needed for schannel connections */
	if ( !*(*cli)->domain )
		fstrcpy( (*cli)->domain, domain->name );

	if ( !cli_nt_session_open (*cli, pipe_index) ) {

		result = NT_STATUS_PIPE_NOT_AVAILABLE;

		/* This might be a NT4 DC */
		if ( is_win2k_pipe(pipe_index) )
			add_failed_connection = False;

		cli_shutdown(*cli);
		goto done;
	}

	result = NT_STATUS_OK;
	add_failed_connection = False;

 done:
	if (got_mutex)
		secrets_named_mutex_release(controller);

	SAFE_FREE(machine_password);
	SAFE_FREE(machine_krb5_principal);
	SAFE_FREE(ipc_username);
	SAFE_FREE(ipc_domain);
	SAFE_FREE(ipc_password);

	if (add_failed_connection)
		add_failed_connection_entry(domain->name, controller, result);

	return result;
}

struct dc_name_ip {
	fstring name;
	struct in_addr ip;
};

static BOOL add_one_dc_unique(TALLOC_CTX *mem_ctx, const char *domain_name,
			      const char *dcname, struct in_addr ip,
			      struct dc_name_ip **dcs, int *num)
{
	if (!NT_STATUS_IS_OK(check_negative_conn_cache(domain_name, dcname)))
		return False;

	*dcs = TALLOC_REALLOC_ARRAY(mem_ctx, *dcs, struct dc_name_ip, (*num)+1);

	if (*dcs == NULL)
		return False;

	fstrcpy((*dcs)[*num].name, dcname);
	(*dcs)[*num].ip = ip;
	*num += 1;
	return True;
}

static BOOL add_sockaddr_to_array(TALLOC_CTX *mem_ctx,
				  struct in_addr ip, uint16 port,
				  struct sockaddr_in **addrs, int *num)
{
	*addrs = TALLOC_REALLOC_ARRAY(mem_ctx, *addrs, struct sockaddr_in, (*num)+1);

	if (*addrs == NULL)
		return False;

	(*addrs)[*num].sin_family = PF_INET;
	putip((char *)&((*addrs)[*num].sin_addr), (char *)&ip);
	(*addrs)[*num].sin_port = htons(port);

	*num += 1;
	return True;
}

/*******************************************************************
 convert an ip to a name
*******************************************************************/

static void dcip_to_name( const char *domainname, const char *realm, struct in_addr ip, fstring name )
{
	/* try node status request first */

	if ( name_status_find(domainname, 0x1c, 0x20, ip, name) )
		return;

	/* backup in case the ads stuff fails */

	fstrcpy( name, inet_ntoa(ip) );

#ifdef WITH_ADS
	/* for active directory servers, try to get the ldap server name.
	   None of these failure should be considered critical for now */

	if ( lp_security() == SEC_ADS ) 
	{
		ADS_STRUCT *ads;
		ADS_STATUS status;

		ads = ads_init( realm, domainname, NULL );
		ads->auth.flags |= ADS_AUTH_NO_BIND;

		if ( !ads_try_connect( ads, inet_ntoa(ip), LDAP_PORT ) )  {
			ads_destroy( &ads );
			return;
		}

		status = ads_server_info(ads);
		if ( !ADS_ERR_OK(status) ) {
			ads_destroy( &ads );
			return;
		}

		fstrcpy(name, ads->config.ldap_server_name);

		ads_destroy( &ads );
	}
#endif

	return;
}


/*******************************************************************
 Retreive a list of IP address for domain controllers.  Fill in 
 the dcs[]  with results.
*******************************************************************/

static BOOL get_dcs(TALLOC_CTX *mem_ctx, const struct winbindd_domain *domain,
		    struct dc_name_ip **dcs, int *num_dcs)
{
	fstring dcname;
	struct  in_addr ip;
	struct  ip_service *ip_list = NULL;
	int     iplist_size = 0;
	int     i;
	BOOL    is_our_domain;


	is_our_domain = strequal(domain->name, lp_workgroup());

	if ( !is_our_domain 
		&& get_dc_name_via_netlogon(domain, dcname, &ip) 
		&& add_one_dc_unique(mem_ctx, domain->name, dcname, ip, dcs, num_dcs) )
	{
		return True;
	}

	if ( is_our_domain 
		&& must_use_pdc(domain->name) 
		&& get_pdc_ip(domain->name, &ip)) 
	{
		if (add_one_dc_unique(mem_ctx, domain->name, inet_ntoa(ip), ip, dcs, num_dcs)) 
			return True;
	}

	/* try standard netbios queries first */

	get_sorted_dc_list(domain->name, &ip_list, &iplist_size, False);

	/* check for security = ads and use DNS if we can */

	if ( iplist_size==0 && lp_security() == SEC_ADS ) 
		get_sorted_dc_list(domain->alt_name, &ip_list, &iplist_size, True);

	/* now add to the dc array.  We'll wait until the last minute 
	   to look up the name of the DC.  But we fill in the char* for 
	   the ip now in to make the failed connection cache work */

	for ( i=0; i<iplist_size; i++ ) {
		add_one_dc_unique(mem_ctx, domain->name, inet_ntoa(ip_list[i].ip), 
			ip_list[i].ip, dcs, num_dcs);
	}

	SAFE_FREE( ip_list );

	return True;
}

static BOOL find_new_dc(TALLOC_CTX *mem_ctx,
			const struct winbindd_domain *domain,
			fstring dcname, struct sockaddr_in *addr, int *fd)
{
	struct dc_name_ip *dcs = NULL;
	int num_dcs = 0;

	const char **dcnames = NULL;
	int num_dcnames = 0;

	struct sockaddr_in *addrs = NULL;
	int num_addrs = 0;

	int i, fd_index;

	if (!get_dcs(mem_ctx, domain, &dcs, &num_dcs) || (num_dcs == 0))
		return False;

	for (i=0; i<num_dcs; i++) {

		add_string_to_array(mem_ctx, dcs[i].name,
				    &dcnames, &num_dcnames);
		add_sockaddr_to_array(mem_ctx, dcs[i].ip, 445,
				      &addrs, &num_addrs);

		add_string_to_array(mem_ctx, dcs[i].name,
				    &dcnames, &num_dcnames);
		add_sockaddr_to_array(mem_ctx, dcs[i].ip, 139,
				      &addrs, &num_addrs);
	}

	if ((num_dcnames == 0) || (num_dcnames != num_addrs))
		return False;

	if ( !open_any_socket_out(addrs, num_addrs, 10000, &fd_index, fd) ) 
	{
		for (i=0; i<num_dcs; i++) {
			add_failed_connection_entry(domain->name,
				dcs[i].name, NT_STATUS_UNSUCCESSFUL);
		}
		return False;
	}

	*addr = addrs[fd_index];

	/* if we have no name on the server or just an IP address for 
	   the name, now try to get the name */

	if ( is_ipaddress(dcnames[fd_index]) || *dcnames[fd_index] == '\0' )
		dcip_to_name( domain->name, domain->alt_name, addr->sin_addr, dcname );
	else
		fstrcpy(dcname, dcnames[fd_index]);

	return True;
}

static NTSTATUS cm_open_connection(struct winbindd_domain *domain,
				   const int pipe_index,
				   struct winbindd_cm_conn *new_conn)
{
	TALLOC_CTX *mem_ctx;
	NTSTATUS result;

	int retries;

	if ((mem_ctx = talloc_init("cm_open_connection")) == NULL)
		return NT_STATUS_NO_MEMORY;

	for (retries = 0; retries < 3; retries++) {

		int fd = -1;
		BOOL retry;

		result = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;

		if ((strlen(domain->dcname) > 0) &&
		    NT_STATUS_IS_OK(check_negative_conn_cache(domain->name,
							      domain->dcname))) {
			int dummy;
			if (!open_any_socket_out(&domain->dcaddr, 1, 10000,
						 &dummy, &fd)) {
				fd = -1;
			}
		}

		if ((fd == -1) &&
		    !find_new_dc(mem_ctx, domain, domain->dcname,
				 &domain->dcaddr, &fd))
			break;

		new_conn->cli = NULL;

		result = cm_prepare_connection(domain, fd, pipe_index,
					       domain->dcname,
					       &new_conn->cli, &retry);

		if (NT_STATUS_IS_OK(result)) {
			fstrcpy(new_conn->domain, domain->name);
			/* Initialise SMB connection */
			fstrcpy(new_conn->pipe_name,
				get_pipe_name_from_index(pipe_index));
			break;
		}

		if (!retry)
			break;
	}

	talloc_destroy(mem_ctx);
	return result;
}

/************************************************************************
 Wrapper around statuc cm_open_connection to retreive a freshly
 setup cli_state struct
************************************************************************/

NTSTATUS cm_fresh_connection(struct winbindd_domain *domain, const int pipe_index,
			       struct cli_state **cli)
{
	NTSTATUS result;
	struct winbindd_cm_conn conn;
	
	result = cm_open_connection( domain, pipe_index, &conn );
	
	if ( NT_STATUS_IS_OK(result) ) 
		*cli = conn.cli;

	return result;
}

/* Return true if a connection is still alive */

static BOOL connection_ok(struct winbindd_cm_conn *conn)
{
	if (!conn) {
		smb_panic("Invalid parameter passed to connection_ok():  conn was NULL!\n");
		return False;
	}

	if (!conn->cli) {
		DEBUG(3, ("Connection to %s for domain %s (pipe %s) has NULL conn->cli!\n", 
			  conn->controller, conn->domain, conn->pipe_name));
		return False;
	}

	if (!conn->cli->initialised) {
		DEBUG(3, ("Connection to %s for domain %s (pipe %s) was never initialised!\n", 
			  conn->controller, conn->domain, conn->pipe_name));
		return False;
	}

	if (conn->cli->fd == -1) {
		DEBUG(3, ("Connection to %s for domain %s (pipe %s) has died or was never started (fd == -1)\n", 
			  conn->controller, conn->domain, conn->pipe_name));
		return False;
	}
	
	return True;
}

/* Search the cache for a connection. If there is a broken one,
   shut it down properly and return NULL. */

static void find_cm_connection(struct winbindd_domain *domain, const char *pipe_name,
			       struct winbindd_cm_conn **conn_out) 
{
	struct winbindd_cm_conn *conn;

	for (conn = cm_conns; conn; ) {
		if (strequal(conn->domain, domain->name) && 
		    strequal(conn->pipe_name, pipe_name)) {
			if (!connection_ok(conn)) {
				/* Dead connection - remove it. */
				struct winbindd_cm_conn *conn_temp = conn->next;
				if (conn->cli)
					cli_shutdown(conn->cli);
				DLIST_REMOVE(cm_conns, conn);
				SAFE_FREE(conn);
				conn = conn_temp;  /* Keep the loop moving */
				continue;
			} else {
				break;
			}
		}
		conn = conn->next;
	}

	*conn_out = conn;
}

/* Initialize a new connection up to the RPC BIND. */

static NTSTATUS new_cm_connection(struct winbindd_domain *domain, const char *pipe_name,
				  struct winbindd_cm_conn **conn_out)
{
	struct winbindd_cm_conn *conn;
	NTSTATUS result;

	if (!(conn = SMB_MALLOC_P(struct winbindd_cm_conn)))
		return NT_STATUS_NO_MEMORY;
		
	ZERO_STRUCTP(conn);
		
	if (!NT_STATUS_IS_OK(result = cm_open_connection(domain, get_pipe_index(pipe_name), conn))) {
		DEBUG(3, ("Could not open a connection to %s for %s (%s)\n", 
			  domain->name, pipe_name, nt_errstr(result)));
		SAFE_FREE(conn);
		return result;
	}
	DLIST_ADD(cm_conns, conn);

	*conn_out = conn;
	return NT_STATUS_OK;
}

/* Get a connection to the remote DC and open the pipe.  If there is already a connection, use that */

static NTSTATUS get_connection_from_cache(struct winbindd_domain *domain, const char *pipe_name,
					  struct winbindd_cm_conn **conn_out)
{
	find_cm_connection(domain, pipe_name, conn_out);

	if (*conn_out != NULL)
		return NT_STATUS_OK;

	return new_cm_connection(domain, pipe_name, conn_out);
}

/**********************************************************************************
 We can 'sense' certain things about the DC by it's replies to certain questions.

 This tells us if this particular remote server is Active Directory, and if it is
 native mode.
**********************************************************************************/

void set_dc_type_and_flags( struct winbindd_domain *domain )
{
	NTSTATUS 		result;
	struct winbindd_cm_conn	conn;
	DS_DOMINFO_CTR		ctr;
	TALLOC_CTX              *mem_ctx = NULL;
	
	ZERO_STRUCT( conn );
	ZERO_STRUCT( ctr );
	
	domain->native_mode = False;
	domain->active_directory = False;

	if (domain->internal) {
		domain->initialized = True;
		return;
	}
	
	if ( !NT_STATUS_IS_OK(result = cm_open_connection(domain, PI_LSARPC_DS, &conn)) ) {
		DEBUG(5, ("set_dc_type_and_flags: Could not open a connection to %s for PIPE_LSARPC (%s)\n", 
			  domain->name, nt_errstr(result)));
		domain->initialized = True;
		return;
	}
	
	if ( conn.cli ) {
		if ( !NT_STATUS_IS_OK(cli_ds_getprimarydominfo( conn.cli, 
				conn.cli->mem_ctx, DsRolePrimaryDomainInfoBasic, &ctr)) ) {
			goto done;
		}
	}
				
	if ( (ctr.basic->flags & DSROLE_PRIMARY_DS_RUNNING) 
			&& !(ctr.basic->flags & DSROLE_PRIMARY_DS_MIXED_MODE) )
		domain->native_mode = True;

	/* Cheat - shut down the DS pipe, and open LSA */

	cli_nt_session_close(conn.cli);

	if ( cli_nt_session_open (conn.cli, PI_LSARPC) ) {
		char *domain_name = NULL;
		char *dns_name = NULL;
		DOM_SID *dom_sid = NULL;

		mem_ctx = talloc_init("set_dc_type_and_flags on domain %s\n", domain->name);
		if (!mem_ctx) {
			DEBUG(1, ("set_dc_type_and_flags: talloc_init() failed\n"));
			return;
		}

		result = cli_lsa_open_policy2(conn.cli, mem_ctx, True, 
					      SEC_RIGHTS_MAXIMUM_ALLOWED,
					      &conn.pol);
		
		if (NT_STATUS_IS_OK(result)) {
			/* This particular query is exactly what Win2k clients use 
			   to determine that the DC is active directory */
			result = cli_lsa_query_info_policy2(conn.cli, mem_ctx, 
							    &conn.pol,
							    12, &domain_name,
							    &dns_name, NULL,
							    NULL, &dom_sid);
		}

		if (NT_STATUS_IS_OK(result)) {
			if (domain_name)
				fstrcpy(domain->name, domain_name);
			
			if (dns_name)
				fstrcpy(domain->alt_name, dns_name);

			if (dom_sid) 
				sid_copy(&domain->sid, dom_sid);

			domain->active_directory = True;
		} else {
			
			result = cli_lsa_open_policy(conn.cli, mem_ctx, True, 
						     SEC_RIGHTS_MAXIMUM_ALLOWED,
						     &conn.pol);
			
			if (!NT_STATUS_IS_OK(result))
				goto done;
			
			result = cli_lsa_query_info_policy(conn.cli, mem_ctx, 
							   &conn.pol, 5, &domain_name, 
							   &dom_sid);
			
			if (NT_STATUS_IS_OK(result)) {
				if (domain_name)
					fstrcpy(domain->name, domain_name);
				
				if (dom_sid) 
					sid_copy(&domain->sid, dom_sid);
			}
		}
	}
	
done:
	
	DEBUG(3,("add_trusted_domain: %s is an %s %s domain\n", domain->name,
		domain->active_directory ? "ADS" : "NT4",
		domain->native_mode ? "native mode" :
		((domain->active_directory && !domain->native_mode) ? "mixed mode" : "")));

	/* close the connection;  no other calls use this pipe and it is called only
	   on reestablishing the domain list   --jerry */
	
	if ( conn.cli )
		cli_shutdown( conn.cli );
	
	talloc_destroy(mem_ctx);

	domain->initialized = True;
	
	return;
}



/* Return a LSA policy handle on a domain */

NTSTATUS cm_get_lsa_handle(struct winbindd_domain *domain, CLI_POLICY_HND **return_hnd)
{
	struct winbindd_cm_conn *conn;
	uint32 des_access = SEC_RIGHTS_MAXIMUM_ALLOWED;
	NTSTATUS result;
	static CLI_POLICY_HND hnd;

	/* Look for existing connections */

	if (!NT_STATUS_IS_OK(result = get_connection_from_cache(domain, PIPE_LSARPC, &conn)))
		return result;

	/* This *shitty* code needs scrapping ! JRA */
	
	if (policy_handle_is_valid(&conn->pol)) {
		hnd.pol = conn->pol;
		hnd.cli = conn->cli;
		*return_hnd = &hnd;

		return NT_STATUS_OK;
	}
	
	result = cli_lsa_open_policy(conn->cli, conn->cli->mem_ctx, False, 
				     des_access, &conn->pol);

	if (!NT_STATUS_IS_OK(result)) {
		/* Hit the cache code again.  This cleans out the old connection and gets a new one */
		if (conn->cli->fd == -1) { /* Try again, if the remote host disapeared */
			if (!NT_STATUS_IS_OK(result = get_connection_from_cache(domain, PIPE_LSARPC, &conn)))
				return result;

			result = cli_lsa_open_policy(conn->cli, conn->cli->mem_ctx, False, 
						     des_access, &conn->pol);
		}

		if (!NT_STATUS_IS_OK(result)) {
			cli_shutdown(conn->cli);
			DLIST_REMOVE(cm_conns, conn);
			SAFE_FREE(conn);
			return result;
		}
	}	

	hnd.pol = conn->pol;
	hnd.cli = conn->cli;

	*return_hnd = &hnd;

	return NT_STATUS_OK;
}

/* Return a SAM policy handle on a domain */

NTSTATUS cm_get_sam_handle(struct winbindd_domain *domain, CLI_POLICY_HND **return_hnd)
{ 
	struct winbindd_cm_conn *conn;
	uint32 des_access = SEC_RIGHTS_MAXIMUM_ALLOWED;
	NTSTATUS result;
	static CLI_POLICY_HND hnd;

	/* Look for existing connections */

	if (!NT_STATUS_IS_OK(result = get_connection_from_cache(domain, PIPE_SAMR, &conn)))
		return result;
	
	/* This *shitty* code needs scrapping ! JRA */
	
	if (policy_handle_is_valid(&conn->pol)) {
		hnd.pol = conn->pol;
		hnd.cli = conn->cli;
		
		*return_hnd = &hnd;

		return NT_STATUS_OK;
	}
	
	result = cli_samr_connect(conn->cli, conn->cli->mem_ctx,
				  des_access, &conn->pol);

	if (!NT_STATUS_IS_OK(result)) {
		/* Hit the cache code again.  This cleans out the old connection and gets a new one */
		if (conn->cli->fd == -1) { /* Try again, if the remote host disapeared */
		
			if (!NT_STATUS_IS_OK(result = get_connection_from_cache(domain, PIPE_SAMR, &conn)))
				return result;

			result = cli_samr_connect(conn->cli, conn->cli->mem_ctx,
						  des_access, &conn->pol);
		}

		if (!NT_STATUS_IS_OK(result)) {
		
			cli_shutdown(conn->cli);
			DLIST_REMOVE(cm_conns, conn);
			SAFE_FREE(conn);
			
			return result;
		}
	}	

	hnd.pol = conn->pol;
	hnd.cli = conn->cli;

	*return_hnd = &hnd;

	return NT_STATUS_OK;
}

/* Get a handle on a netlogon pipe.  This is a bit of a hack to re-use the
   netlogon pipe as no handle is returned. */

NTSTATUS cm_get_netlogon_cli(struct winbindd_domain *domain, 
			     const unsigned char *trust_passwd, 
			     uint32 sec_channel_type,
			     BOOL fresh,
			     struct cli_state **cli)
{
	NTSTATUS result = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
	struct winbindd_cm_conn *conn;
	fstring lock_name;
	BOOL got_mutex;

	if (!cli)
		return NT_STATUS_INVALID_PARAMETER;

	/* Open an initial conection - keep the mutex. */

	find_cm_connection(domain, PIPE_NETLOGON, &conn);

	if ( fresh && (conn != NULL) ) {
		cli_shutdown(conn->cli);
		conn->cli = NULL;

		conn = NULL;

		/* purge connection from cache */
		find_cm_connection(domain, PIPE_NETLOGON, &conn);
		if (conn != NULL) {
			DEBUG(0,("Could not purge connection\n"));
			return NT_STATUS_UNSUCCESSFUL;
		}
	}

	if (conn != NULL) {
		*cli = conn->cli;
		return NT_STATUS_OK;
	}

	result = new_cm_connection(domain, PIPE_NETLOGON, &conn);

	if (!NT_STATUS_IS_OK(result))
		return result;
	
	fstr_sprintf(lock_name, "NETLOGON\\%s", conn->controller);

	if (!(got_mutex = secrets_named_mutex(lock_name, WINBIND_SERVER_MUTEX_WAIT_TIME))) {
		DEBUG(0,("cm_get_netlogon_cli: mutex grab failed for %s\n", conn->controller));
	}
	
	if ( sec_channel_type == SEC_CHAN_DOMAIN )
		fstr_sprintf(conn->cli->mach_acct, "%s$", lp_workgroup());
			
	/* This must be the remote domain (not ours) for schannel */

	fstrcpy( conn->cli->domain, domain->name);
	
	result = cli_nt_establish_netlogon(conn->cli, sec_channel_type, trust_passwd);
	
	if (got_mutex)
		secrets_named_mutex_release(lock_name);
				
	if (!NT_STATUS_IS_OK(result)) {
		cli_shutdown(conn->cli);
		DLIST_REMOVE(cm_conns, conn);
		SAFE_FREE(conn);
		return result;
	}

	*cli = conn->cli;

	return result;
}

/* Dump the current connection status */

static void dump_conn_list(void)
{
	struct winbindd_cm_conn *con;

	DEBUG(0, ("\tDomain	     Controller	     Pipe\n"));

	for(con = cm_conns; con; con = con->next) {
		char *msg;

		/* Display pipe info */
		
		if (asprintf(&msg, "\t%-15s %-15s %-16s", con->domain, con->controller, con->pipe_name) < 0) {
			DEBUG(0, ("Error: not enough memory!\n"));
		} else {
			DEBUG(0, ("%s\n", msg));
			SAFE_FREE(msg);
		}
	}
}

void winbindd_cm_status(void)
{
	/* List open connections */

	DEBUG(0, ("winbindd connection manager status:\n"));

	if (cm_conns)
		dump_conn_list();
	else
		DEBUG(0, ("\tNo active connections\n"));
}

/* Close all cached connections */

void winbindd_cm_flush(void)
{
	struct winbindd_cm_conn *conn, tmp;

	/* Flush connection cache */

	for (conn = cm_conns; conn; conn = conn->next) {

		if (!connection_ok(conn))
			continue;

		DEBUG(10, ("Closing connection to %s on %s\n",
			conn->pipe_name, conn->controller));

		if (conn->cli)
			cli_shutdown(conn->cli);

		tmp.next = conn->next;

		DLIST_REMOVE(cm_conns, conn);
		SAFE_FREE(conn);
		conn = &tmp;
	}

	/* Flush failed connection cache */

	flush_negative_conn_cache();
}