summaryrefslogtreecommitdiffstats
path: root/kdm/backend/auth.c
blob: 3fb18ac4c1443c55629b16b0dd55346866192540 (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
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
/*

Copyright 1988, 1998  The Open Group
Copyright 2000-2004 Oswald Buddenhagen <ossi@kde.org>

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of a copyright holder shall
not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization
from the copyright holder.

*/

/*
 * xdm - display manager daemon
 * Author: Keith Packard, MIT X Consortium
 *
 * maintain the authorization generation daemon
 */

#include "dm.h"
#include "dm_auth.h"
#include "dm_error.h"

#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>

#include <sys/ioctl.h>

#include "dm_socket.h"
#ifdef DNETCONN
# include <netdnet/dnetdb.h>
#endif

#if (defined(_POSIX_SOURCE) && !defined(_AIX) && !defined(__QNX__)) || defined(__hpux) || defined(__svr4__) /* XXX */
# define NEED_UTSNAME
# include <sys/utsname.h>
#endif

#ifdef __GNU__
# include <netdb.h>
# undef SIOCGIFCONF
#else /* __GNU__ */
# include <net/if.h>
# ifdef __svr4__
#  include <netdb.h>
#  include <sys/sockio.h>
#  include <sys/stropts.h>
# endif
# ifdef __EMX__
#  define link rename
#  define chown(a,b,c)
#  include <io.h>
# endif
#endif /* __GNU__ */

struct AuthProtocol {
	unsigned short name_length;
	const char *name;
	void (*InitAuth)( unsigned short len, const char *name );
	Xauth *(*GetAuth)( unsigned short len, const char *name );
#ifdef XDMCP
	void (*GetXdmcpAuth)( struct protoDisplay *pdpy,
	                      unsigned short authorizationNameLen,
	                      const char *authorizationName );
#endif
	int inited;
};

#ifdef XDMCP
# define xdmcpauth(arg) , arg
#else
# define xdmcpauth(arg)
#endif

static struct AuthProtocol AuthProtocols[] = {
{ (unsigned short)18, "MIT-MAGIC-COOKIE-1",
	MitInitAuth, MitGetAuth xdmcpauth(NULL), 0
},
#ifdef HASXDMAUTH
{ (unsigned short)19, "XDM-AUTHORIZATION-1",
	XdmInitAuth, XdmGetAuth xdmcpauth(XdmGetXdmcpAuth), 0
},
#endif
#ifdef SECURE_RPC
{ (unsigned short)9, "SUN-DES-1",
	SecureRPCInitAuth, SecureRPCGetAuth xdmcpauth(NULL), 0
},
#endif
#ifdef K5AUTH
{ (unsigned short)14, "MIT-KERBEROS-5",
	Krb5InitAuth, Krb5GetAuth xdmcpauth(NULL), 0
},
#endif
};

static struct AuthProtocol *
findProtocol( unsigned short name_length, const char *name )
{
	unsigned i;

	for (i = 0; i < as(AuthProtocols); i++)
		if (AuthProtocols[i].name_length == name_length &&
		    memcmp( AuthProtocols[i].name, name, name_length ) == 0)
		{
			return &AuthProtocols[i];
		}
	return (struct AuthProtocol *)0;
}

int
ValidAuthorization( unsigned short name_length, const char *name )
{
	if (findProtocol( name_length, name ))
		return TRUE;
	return FALSE;
}

static Xauth *
GenerateAuthorization( unsigned short name_length, const char *name )
{
	struct AuthProtocol *a;
	Xauth *auth = 0;

	Debug( "GenerateAuthorization %s\n", name );
	if ((a = findProtocol( name_length, name ))) {
		if (!a->inited) {
			(*a->InitAuth)( name_length, name );
			a->inited = TRUE;
		}
		auth = (*a->GetAuth)( name_length, name );
		if (auth) {
			Debug( "got %p (%d %.*s) %02[*hhx\n", auth,
			       auth->name_length, auth->name_length, auth->name,
			       auth->data_length, auth->data );
		} else
			Debug( "got (null)\n" );
	} else
		Debug( "unknown authorization %s\n", name );
	return auth;
}

#ifdef XDMCP

void
SetProtoDisplayAuthorization( struct protoDisplay *pdpy,
                              unsigned short authorizationNameLen,
                              const char *authorizationName )
{
	struct AuthProtocol *a;
	Xauth *auth;

	a = findProtocol( authorizationNameLen, authorizationName );
	pdpy->xdmcpAuthorization = pdpy->fileAuthorization = 0;
	if (a) {
		if (!a->inited) {
			(*a->InitAuth)( authorizationNameLen, authorizationName );
			a->inited = TRUE;
		}
		if (a->GetXdmcpAuth) {
			(*a->GetXdmcpAuth)( pdpy, authorizationNameLen, authorizationName );
			auth = pdpy->xdmcpAuthorization;
		} else {
			auth = (*a->GetAuth)( authorizationNameLen, authorizationName );
			pdpy->fileAuthorization = auth;
			pdpy->xdmcpAuthorization = 0;
		}
		if (auth)
			Debug( "got %p (%d %.*s)\n", auth,
			       auth->name_length, auth->name_length, auth->name );
		else
			Debug( "got (null)\n" );
	}
}

#endif /* XDMCP */

void
CleanUpFileName( const char *src, char *dst, int len )
{
	while (*src) {
		if (--len <= 0)
				break;
		switch (*src & 0x7f) {
		case '/':
			*dst++ = '_';
			break;
		case '-':
			*dst++ = '.';
			break;
		default:
			*dst++ = (*src & 0x7f);
		}
		++src;
	}
	*dst = '\0';
}


static FILE *
fdOpenW( int fd )
{
	FILE *f;

	if (fd >= 0) {
		if ((f = fdopen( fd, "w" )))
			return f;
		close( fd );
	}
	return 0;
}

static FILE *
mkTempFile( char *nambuf, int namelen )
{
	FILE *f;
	int r;

	for (r = 0; r < 100; r++) {
		randomStr( nambuf + namelen );
		if ((f = fdOpenW( open( nambuf, O_WRONLY | O_CREAT | O_EXCL, 0600 ) )))
			return f;
		if (errno != EEXIST)
			break;
	}
	return 0;
}

#define NAMELEN 255

static FILE *
MakeServerAuthFile( struct display *d )
{
	FILE *f;
	int i;
	char cleanname[NAMELEN], nambuf[NAMELEN+128];

	/*
	 * Some paranoid, but still not sufficient (DoS was still possible)
	 * checks used to be here. I removed all this stuff because
	 * a) authDir is supposed to be /var/run/xauth (=safe) or similar and
	 * b) even if it's not (say, /tmp), we create files safely (hopefully).
	 */
	if (mkdir( authDir, 0755 ) < 0  &&  errno != EEXIST)
		return 0;
	CleanUpFileName( d->name, cleanname, NAMELEN - 8 );
	i = sprintf( nambuf, "%s/A%s-", authDir, cleanname );
	if ((f = mkTempFile( nambuf, i ))) {
		StrDup( &d->authFile, nambuf );
		return f;
	}
	return 0;
}

int
SaveServerAuthorizations( struct display *d, Xauth **auths, int count )
{
	FILE *auth_file;
	int i;

	if (!d->authFile && d->clientAuthFile && *d->clientAuthFile)
		StrDup( &d->authFile, d->clientAuthFile );
	if (d->authFile) {
		if (!(auth_file = fdOpenW( creat( d->authFile, 0600 ) ))) {
			LogError( "Cannot open X server authorization file %s\n", d->authFile );
			free( d->authFile );
			d->authFile = NULL;
			return FALSE;
		}
	} else {
		if (!(auth_file = MakeServerAuthFile( d ))) {
			LogError( "Cannot create X server authorization file\n" );
			return FALSE;
		}
	}
	Debug( "file: %s  auth: %p\n", d->authFile, auths );
	for (i = 0; i < count; i++) {
		/*
		 * User-based auths may not have data until
		 * a user logs in.  In which case don't write
		 * to the auth file so xrdb and setup programs don't fail.
		 */
		if (auths[i]->data_length > 0)
			if (!XauWriteAuth( auth_file, auths[i] ) ||
			    fflush( auth_file ) == EOF)
			{
				fclose( auth_file );
				LogError( "Cannot write X server authorization file %s\n",
				          d->authFile );
				free( d->authFile );
				d->authFile = NULL;
				return FALSE;
			}
	}
	fclose( auth_file );
	return TRUE;
}

void
SetLocalAuthorization( struct display *d )
{
	Xauth *auth, **auths;
	int i, j;

	if (d->authorizations)
	{
		for (i = 0; i < d->authNum; i++)
			XauDisposeAuth( d->authorizations[i] );
		free( (char *)d->authorizations );
		d->authorizations = (Xauth **)NULL;
		d->authNum = 0;
	}
	Debug( "SetLocalAuthorization %s, auths %[s\n", d->name, d->authNames );
	if (!d->authNames)
		return;
	for (i = 0; d->authNames[i]; i++)
		;
	d->authNameNum = i;
	if (d->authNameLens)
		free( (char *)d->authNameLens );
	d->authNameLens = (unsigned short *)Malloc( d->authNameNum * sizeof(unsigned short) );
	if (!d->authNameLens)
		return;
	for (i = 0; i < d->authNameNum; i++)
		d->authNameLens[i] = strlen( d->authNames[i] );
	auths = (Xauth **)Malloc( d->authNameNum * sizeof(Xauth *) );
	if (!auths)
		return;
	j = 0;
	for (i = 0; i < d->authNameNum; i++) {
		auth = GenerateAuthorization( d->authNameLens[i], d->authNames[i] );
		if (auth)
			auths[j++] = auth;
	}
	if (SaveServerAuthorizations( d, auths, j )) {
		d->authorizations = auths;
		d->authNum = j;
	} else {
		for (i = 0; i < j; i++)
			XauDisposeAuth( auths[i] );
		free( (char *)auths );
	}
}

/*
 * Set the authorization to use for xdm's initial connection
 * to the X server.  Cannot use user-based authorizations
 * because no one has logged in yet, so we don't have any
 * user credentials.
 * Well, actually we could use SUN-DES-1 because we tell the server
 * to allow root in.  This is bogus and should be fixed.
 */
void
SetAuthorization( struct display *d )
{
	register Xauth **auth = d->authorizations;
	int i;

	for (i = 0; i < d->authNum; i++) {
		if (auth[i]->name_length == 9 &&
		    memcmp( auth[i]->name, "SUN-DES-1", 9 ) == 0)
			continue;
		if (auth[i]->name_length == 14 &&
		    memcmp( auth[i]->name, "MIT-KERBEROS-5", 14 ) == 0)
			continue;
		XSetAuthorization( auth[i]->name, (int)auth[i]->name_length,
		                   auth[i]->data, (int)auth[i]->data_length );
	}
}

static int
openFiles( const char *name, char *new_name, FILE **oldp, FILE **newp )
{
	strcat( strcpy( new_name, name ), "-n" );
	if (!(*newp =
	      fdOpenW( creat( new_name, 0600 ) ))) {
		Debug( "can't open new file %s\n", new_name );
		return 0;
	}
	*oldp = fopen( name, "r" );
	Debug( "opens succeeded %s %s\n", name, new_name );
	return 1;
}

struct addrList {
	struct addrList *next;
	unsigned short family, address_length, number_length;
	char data[1];
};

static struct addrList *addrs;

static void
initAddrs( void )
{
	addrs = 0;
}

static void
doneAddrs( void )
{
	struct addrList *a, *n;
	for (a = addrs; a; a = n) {
		n = a->next;
		free( a );
	}
}

static void
saveEntry( Xauth *auth )
{
	struct addrList *new;

	if (!(new = Malloc( offsetof(struct addrList, data) +
	                    auth->address_length + auth->number_length )))
		return;
	new->address_length = auth->address_length;
	new->number_length = auth->number_length;
	memcpy( new->data, auth->address, (int)auth->address_length );
	memcpy( new->data + (int)auth->address_length,
	        auth->number, (int)auth->number_length );
	new->family = auth->family;
	new->next = addrs;
	addrs = new;
}

static int
checkEntry( Xauth *auth )
{
	struct addrList *a;

	for (a = addrs; a; a = a->next)
		if (a->family == auth->family &&
		    a->address_length == auth->address_length &&
		    !memcmp( a->data, auth->address, auth->address_length ) &&
		    a->number_length == auth->number_length &&
		    !memcmp( a->data + a->address_length,
		             auth->number, auth->number_length ))
			return 1;
	return 0;
}

static void
writeAuth( FILE *file, Xauth *auth, int *ok )
{
	if (debugLevel & DEBUG_AUTH) /* normally too verbose */
		Debug( "writeAuth: doWrite = %d\n"
		       "family: %d\n"
		       "addr:    %02[*:hhx\n"
		       "number:  %02[*:hhx\n"
		       "name:    %02[*:hhx\n"
		       "data:    %02[*:hhx\n",
		       ok != 0, auth->family,
		       auth->address_length, auth->address,
		       auth->number_length, auth->number,
		       auth->name_length, auth->name,
		       auth->data_length, auth->data );
	if (ok && !XauWriteAuth( file, auth ))
		*ok = FALSE;
}

static void
writeAddr( int family, int addr_length, char *addr,
           FILE *file, Xauth *auth, int *ok )
{
	auth->family = (unsigned short)family;
	auth->address_length = addr_length;
	auth->address = addr;
	Debug( "writeAddr: writing and saving an entry\n" );
	writeAuth( file, auth, ok );
	if (!checkEntry( auth ))
		saveEntry( auth );
}

static void
DefineLocal( FILE *file, Xauth *auth, int *ok )
{
#if !defined(NEED_UTSNAME) || defined(__hpux)
	char displayname[100];
#endif
#ifdef NEED_UTSNAME
	struct utsname name;
#endif

	/* stolen from xinit.c */

/* Make sure this produces the same string as _XGetHostname in lib/X/XlibInt.c.
 * Otherwise, Xau will not be able to find your cookies in the Xauthority file.
 *
 * Note: POSIX says that the ``nodename'' member of utsname does _not_ have
 *       to have sufficient information for interfacing to the network,
 *       and so, you may be better off using gethostname (if it exists).
 */

#ifdef NEED_UTSNAME

	/* hpux:
	 * Why not use gethostname()?  Well, at least on my system, I've had to
	 * make an ugly kernel patch to get a name longer than 8 characters, and
	 * uname() lets me access to the whole string (it smashes release, you
	 * see), whereas gethostname() kindly truncates it for me.
	 */
	uname( &name );
	writeAddr( FamilyLocal, strlen( name.nodename ), name.nodename,
	           file, auth, ok );
#endif

#if !defined(NEED_UTSNAME) || defined(__hpux)
	/* _AIX:
	 * In _AIX, _POSIX_SOURCE is defined, but uname gives only first
	 * field of hostname. Thus, we use gethostname instead.
	 */

	/*
	 * For HP-UX, HP's Xlib expects a fully-qualified domain name, which
	 * is achieved by using gethostname().  For compatability, we must
	 * also still create the entry using uname() above.
	 */
	displayname[0] = 0;
	if (!gethostname( displayname, sizeof(displayname) ))
		displayname[sizeof(displayname) - 1] = 0;

# ifdef NEED_UTSNAME
	/*
	 * If gethostname and uname both returned the same name,
	 * do not write a duplicate entry.
	 */
	if (strcmp( displayname, name.nodename ))
# endif
		writeAddr( FamilyLocal, strlen( displayname ), displayname,
		           file, auth, ok );
#endif
}

#ifdef SYSV_SIOCGIFCONF

/* Deal with different SIOCGIFCONF ioctl semantics on SYSV, SVR4 */

int
ifioctl (int fd, int cmd, char *arg)
{
	struct strioctl ioc;
	int ret;

	bzero( (char *)&ioc, sizeof(ioc) );
	ioc.ic_cmd = cmd;
	ioc.ic_timout = 0;
	if (cmd == SIOCGIFCONF) {
		ioc.ic_len = ((struct ifconf *)arg)->ifc_len;
		ioc.ic_dp = ((struct ifconf *)arg)->ifc_buf;
	} else {
		ioc.ic_len = sizeof(struct ifreq);
		ioc.ic_dp = arg;
	}
	ret = ioctl( fd, I_STR, (char *)&ioc );
	if (ret >= 0 && cmd == SIOCGIFCONF)
		((struct ifconf *)arg)->ifc_len = ioc.ic_len;
	return (ret);
}

#endif /* SYSV_SIOCGIFCONF */

#ifdef HAVE_GETIFADDRS
# include <ifaddrs.h>

static void
DefineSelf( FILE *file, Xauth *auth, int *ok )
{
	struct ifaddrs *ifap, *ifr;
	char *addr;
	int family, len;

	if (getifaddrs( &ifap ) < 0)
		return;
	for (ifr = ifap; ifr; ifr = ifr->ifa_next) {
		if (!ifr->ifa_addr)
			continue;
		family = ConvertAddr( (char *)(ifr->ifa_addr), &len, &addr );
		if (family == -1 || family == FamilyLocal)
			continue;
		/*
		 * don't write out 'localhost' entries, as
		 * they may conflict with other local entries.
		 * DefineLocal will always be called to add
		 * the local entry anyway, so this one can
		 * be tossed.
		 */
		if (family == FamilyInternet &&
		    addr[0] == 127 && addr[1] == 0 && addr[2] == 0 && addr[3] == 1)
		{
			Debug( "Skipping localhost address\n" );
			continue;
		}
# if defined(IPv6) && defined(AF_INET6)
		if (family == FamilyInternet6) {
			if (IN6_IS_ADDR_LOOPBACK( ((struct in6_addr *)addr) )) {
				Debug( "Skipping IPv6 localhost address\n" );
				continue;
			}
			/* Also skip XDM-AUTHORIZATION-1 */
			if (auth->name_length == 19 &&
			    !memcmp( auth->name, "XDM-AUTHORIZATION-1", 19 )) {
				Debug( "Skipping IPv6 XDM-AUTHORIZATION-1\n" );
				continue;
			}
		}
# endif
		writeAddr( family, len, addr, file, auth, ok );
	}
	freeifaddrs( ifap );
}
#else  /* GETIFADDRS */

#if defined(STREAMSCONN) && !defined(SYSV_SIOCGIFCONF) && !defined(WINTCP)

#include <tiuser.h>

/* Define this host for access control.  Find all the hosts the OS knows about
 * for this fd and add them to the selfhosts list.
 * TLI version, written without sufficient documentation.
 */
static void
DefineSelf( int fd, FILE *file, Xauth *auth, int *ok )
{
	struct netbuf netb;
	char addrret[1024]; /* easier than t_alloc */

	netb.maxlen = sizeof(addrret);
	netb.buf = addrret;
	if (t_getname( fd, &netb, LOCALNAME ) == -1)
		t_error( "t_getname" );
	/* what a kludge */
	writeAddr( FamilyInternet, 4, netb.buf+4, file, auth, ok );
}

#else

#ifdef WINTCP /* NCR with Wollongong TCP */

#include <stropts.h>
#include <tiuser.h>

#include <sys/stream.h>
#include <net/if.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/in.h>
#include <netinet/in_var.h>

static void
DefineSelf( int fd, FILE *file, Xauth *auth, int *ok )
{
	/*
	 * The Wollongong drivers used by NCR SVR4/MP-RAS don't understand the
	 * socket IO calls that most other drivers seem to like. Because of
	 * this, this routine must be special cased for NCR. Eventually,
	 * this will be cleared up.
	 */

	struct ipb ifnet;
	struct in_ifaddr ifaddr;
	struct strioctl str;
	unsigned char *addr;
	int len, ipfd;

	if ((ipfd = open( "/dev/ip", O_RDWR, 0 )) < 0) {
		LogError( "Trouble getting interface configuration\n" );
		return;
	}

	/* Indicate that we want to start at the begining */
	ifnet.ib_next = (struct ipb *)1;

	while (ifnet.ib_next) {
		str.ic_cmd = IPIOC_GETIPB;
		str.ic_timout = 0;
		str.ic_len = sizeof(struct ipb);
		str.ic_dp = (char *)&ifnet;

		if (ioctl( ipfd, (int)I_STR, (char *)&str ) < 0) {
			close( ipfd );
			LogError( "Trouble getting interface configuration\n" );
			return;
		}

		ifaddr.ia_next = (struct in_ifaddr *)ifnet.if_addrlist;
		str.ic_cmd = IPIOC_GETINADDR;
		str.ic_timout = 0;
		str.ic_len = sizeof(struct in_ifaddr);
		str.ic_dp = (char *)&ifaddr;

		if (ioctl( ipfd, (int)I_STR, (char *)&str ) < 0) {
			close( ipfd );
			LogError( "Trouble getting interface configuration\n" );
			return;
		}

		/*
		 * Ignore the 127.0.0.1 entry.
		 */
		if (IA_SIN( &ifaddr )->sin_addr.s_addr == htonl( 0x7f000001 ) )
			continue;

		writeAddr( FamilyInternet, 4, (char *)&(IA_SIN( &ifaddr )->sin_addr),
		           file, auth, ok );

	}
	close( ipfd );
}

#else /* WINTCP */

/* Solaris provides an extended interface SIOCGLIFCONF.  Other systems
 * may have this as well, but the code has only been tested on Solaris
 * so far, so we only enable it there.  Other platforms may be added as
 * needed.
 *
 * Test for Solaris commented out  --  TSI @ UQV 2003.06.13
 */
#ifdef SIOCGLIFCONF
/* #if defined(sun) */
# define USE_SIOCGLIFCONF
/* #endif */
#endif

#if defined(SIOCGIFCONF) || defined (USE_SIOCGLIFCONF)

#if !defined(SYSV_SIOCGIFCONF) || defined(USE_SIOCGLIFCONF)
# define ifioctl ioctl
#endif

#ifdef USE_SIOCGLIFCONF
# define ifr_type struct lifreq
#else
# define ifr_type struct ifreq
#endif

/* Handle variable length ifreq in BNR2 and later */
#ifdef VARIABLE_IFREQ
# define ifr_size(p) (sizeof(struct ifreq) + \
                      (p->ifr_addr.sa_len > sizeof(p->ifr_addr) ? \
                       p->ifr_addr.sa_len - sizeof(p->ifr_addr) : 0))
#else
# define ifr_size(p) (sizeof(ifr_type))
#endif

#ifdef USE_SIOCGLIFCONF
# define IFC_IOCTL_REQ SIOCGLIFCONF
# define IFC_REQ(ifc) ifc.lifc_req
# define IFC_LEN(ifc) ifc.lifc_len
# define IFR_ADDR(ifr) ifr->lifr_addr
# define IFR_NAME(ifr) ifr->lifr_name
#else
# define IFC_IOCTL_REQ SIOCGIFCONF
# define IFC_REQ(ifc) ifc.ifc_req
# define IFC_LEN(ifc) ifc.ifc_len
# define IFR_ADDR(ifr) ifr->ifr_addr
# define IFR_NAME(ifr) ifr->ifr_name
#endif

/* Define this host for access control.  Find all the hosts the OS knows about
 * for this fd and add them to the selfhosts list.
 */
static void
DefineSelf( int fd, FILE *file, Xauth *auth, int *ok )
{
	char buf[2048], *cp, *cplim;
	int len;
	char *addr;
	int family;
	ifr_type *ifr;
#ifdef USE_SIOCGLIFCONF
	int n;
	void * bufptr = buf;
	size_t buflen = sizeof(buf);
	struct lifconf ifc;
# ifdef SIOCGLIFNUM
	struct lifnum ifn;
# endif
#else
	struct ifconf ifc;
#endif

#if defined(SIOCGLIFNUM) && defined(SIOCGLIFCONF)
	ifn.lifn_family = AF_UNSPEC;
	ifn.lifn_flags = 0;
	if (ioctl( fd, (int)SIOCGLIFNUM, (char *)&ifn ) < 0)
		LogError( "Failed getting interface count\n" );
	if (buflen < (ifn.lifn_count * sizeof(struct lifreq))) {
		buflen = ifn.lifn_count * sizeof(struct lifreq);
		bufptr = Malloc( buflen );
	}
#endif

#ifdef USE_SIOCGLIFCONF
	ifc.lifc_family = AF_UNSPEC;
	ifc.lifc_flags = 0;
	ifc.lifc_len = buflen;
	ifc.lifc_buf = bufptr;
#else
	ifc.ifc_len = sizeof(buf);
	ifc.ifc_buf = buf;
#endif
	if (ifioctl (fd, IFC_IOCTL_REQ, (char *)&ifc) < 0) {
		LogError( "Trouble getting network interface configuration\n" );
#if defined(SIOCGLIFNUM) && defined(SIOCGLIFCONF)
		if (bufptr != buf)
			free( bufptr );
#endif
		return;
	}

	cplim = (char *)IFC_REQ( ifc ) + IFC_LEN( ifc );

	for (cp = (char *)IFC_REQ( ifc ); cp < cplim; cp += ifr_size (ifr)) {
		ifr = (ifr_type *) cp;
#ifdef DNETCONN
		/*
		 * this is ugly but SIOCGIFCONF returns decnet addresses in
		 * a different form from other decnet calls
		 */
		if (IFR_ADDR( ifr ).sa_family == AF_DECnet) {
				len = sizeof(struct dn_naddr);
				addr = (char *)IFR_ADDR( ifr ).sa_data;
				family = FamilyDECnet;
		} else
#endif
		{
			family = ConvertAddr( (char *)&IFR_ADDR( ifr ), &len, &addr );
			if (family < 0)
				continue;

			if (len == 0) {
				Debug( "skipping zero length address\n" );
				continue;
			}
			/*
			 * don't write out 'localhost' entries, as
			 * they may conflict with other local entries.
			 * DefineLocal will always be called to add
			 * the local entry anyway, so this one can
			 * be tossed.
			 */
			if (family == FamilyInternet &&
			    addr[0] == 127 && addr[1] == 0 &&
			    addr[2] == 0 && addr[3] == 1)
			{
					Debug( "skipping localhost address\n" );
					continue;
			}
#if defined(IPv6) && defined(AF_INET6)
			if (family == FamilyInternet6) {
				if (IN6_IS_ADDR_LOOPBACK( ((struct in6_addr *)addr) )) {
					Debug( "Skipping IPv6 localhost address\n" );
					continue;
				}
				/* Also skip XDM-AUTHORIZATION-1 */
				if (auth->name_length == 19 &&
				    !memcmp( auth->name, "XDM-AUTHORIZATION-1", 19 )) {
					Debug( "Skipping IPv6 XDM-AUTHORIZATION-1\n" );
					continue;
				}
			}
#endif
		}
		Debug( "DefineSelf: write network address, length %d\n", len );
		writeAddr( family, len, addr, file, auth, ok );
	}
#if defined(SIOCGLIFNUM) && defined(SIOCGLIFCONF)
	if (bufptr != buf)
		free( bufptr );
#endif
}

#else /* SIOCGIFCONF */

/* Define this host for access control.  Find all the hosts the OS knows about
 * for this fd and add them to the selfhosts list.
 */
static void
DefineSelf( int fd, int file, int auth, int *ok )
{
	int len;
	caddr_t addr;
	int family;

	struct utsname name;
	register struct hostent  *hp;

	union {
		struct sockaddr   sa;
		struct sockaddr_in  in;
	} saddr;

	struct sockaddr_in *inetaddr;

	/* hpux:
	 * Why not use gethostname()?  Well, at least on my system, I've had to
	 * make an ugly kernel patch to get a name longer than 8 characters, and
	 * uname() lets me access to the whole string (it smashes release, you
	 * see), whereas gethostname() kindly truncates it for me.
	 */
	uname( &name );
	if ((hp = gethostbyname( name.nodename ))) {
		saddr.sa.sa_family = hp->h_addrtype;
		inetaddr = (struct sockaddr_in *)(&(saddr.sa));
		memmove( (char *)&(inetaddr->sin_addr), (char *)hp->h_addr,
		         (int)hp->h_length );
		if ( (family = ConvertAddr( &(saddr.sa), &len, &addr )) >= 0)
			writeAddr( FamilyInternet, sizeof(inetaddr->sin_addr),
			           (char *)(&inetaddr->sin_addr), file, auth, ok );
	}
}

#endif /* SIOCGIFCONF else */
#endif /* WINTCP else */
#endif /* STREAMSCONN && !SYSV_SIOCGIFCONF else */
#endif /* HAVE_GETIFADDRS */

static void
setAuthNumber( Xauth *auth, const char *name )
{
	char *colon;
	char *dot;

	Debug( "setAuthNumber %s\n", name );
	colon = strrchr( name, ':' );
	if (colon) {
		++colon;
		dot = (char*)strchr( colon, '.' );
		if (dot)
			auth->number_length = dot - colon;
		else
			auth->number_length = strlen( colon );
		if (!StrNDup( &auth->number, colon, auth->number_length ))
			auth->number_length = 0;
		Debug( "setAuthNumber: %s\n", auth->number );
	}
}

static void
writeLocalAuth( FILE *file, Xauth *auth, const char *name, int *ok )
{
#if defined(STREAMSCONN) || !defined(HAVE_GETIFADDRS)
	int fd;
#endif

	Debug( "writeLocalAuth: %s %.*s\n", name, auth->name_length, auth->name );
	setAuthNumber( auth, name );
# ifdef STREAMSCONN
	fd = t_open( "/dev/tcp", O_RDWR, 0 );
	t_bind( fd, NULL, NULL );
	DefineSelf( fd, file, auth, ok );
	t_unbind( fd );
	t_close( fd );
# elif defined(HAVE_GETIFADDRS)
	DefineSelf( file, auth, ok );
# else
#  ifdef TCPCONN
#   if defined(IPv6) && defined(AF_INET6)
	fd = socket( AF_INET6, SOCK_STREAM, 0 );
	if (fd < 0)
#   endif
	fd = socket( AF_INET, SOCK_STREAM, 0 );
	DefineSelf( fd, file, auth, ok );
	close( fd );
#  endif
#  ifdef DNETCONN
	fd = socket( AF_DECnet, SOCK_STREAM, 0 );
	DefineSelf( fd, file, auth, ok );
	close( fd );
#  endif
# endif /* HAVE_GETIFADDRS */
	DefineLocal( file, auth, ok );
}

#ifdef XDMCP

/*
 * Call ConvertAddr(), and if it returns an IPv4 localhost, convert it
 * to a local display name.  Meets the _XTransConvertAddress's localhost
 * hack.
 */

static int
ConvertAuthAddr( char *saddr, int *len, char **addr )
{
	int ret = ConvertAddr( saddr, len, addr );
	if (ret == FamilyInternet &&
	    ((struct in_addr *)*addr)->s_addr == htonl( 0x7F000001L ))
		ret = FamilyLocal;
	return ret;
}

static void
writeRemoteAuth( FILE *file, Xauth *auth, XdmcpNetaddr peer, int peerlen,
                 const char *name, int *ok )
{
	int family = FamilyLocal;
	char *addr;

	Debug( "writeRemoteAuth: %s %.*s\n", name, auth->name_length, auth->name );
	if (!peer || peerlen < 2)
		return;
	setAuthNumber( auth, name );
	family = ConvertAuthAddr( peer, &peerlen, &addr );
	Debug( "writeRemoteAuth: family %d\n", family );
	if (family != FamilyLocal) {
		Debug( "writeRemoteAuth: %d, %02[*:hhx\n",
		       family, peerlen, addr );
		writeAddr( family, peerlen, addr, file, auth, ok );
	} else
		writeLocalAuth( file, auth, name, ok );
}

#endif /* XDMCP */

#define NBSIZE 1024

static void
startUserAuth( char *buf, char *nbuf, FILE **old, FILE **new )
{
	const char *home;
	int lockStatus;

	initAddrs();
	*new = 0;
	if ((home = getEnv( userEnviron, "HOME" )) && strlen( home ) < NBSIZE - 12) {
		sprintf( buf, "%s/.Xauthority", home );
		Debug( "XauLockAuth %s\n", buf );
		lockStatus = XauLockAuth( buf, 1, 2, 10 );
		Debug( "lock is %d\n", lockStatus );
		if (lockStatus == LOCK_SUCCESS)
			if (!openFiles( buf, nbuf, old, new ))
				XauUnlockAuth( buf );
	}
	if (!*new)
		LogWarn( "Can't update authorization file in home dir %s\n", home );
}

static int
endUserAuth( FILE *old, FILE *new, const char *nname, int ok )
{
	Xauth *entry;
	struct stat statb;

	if (old) {
		if (fstat( fileno( old ), &statb ) != -1)
			chmod( nname, (int)(statb.st_mode & 0777) );
		/*SUPPRESS 560*/
		while ((entry = XauReadAuth( old ))) {
			if (!checkEntry( entry )) {
				Debug( "writing an entry\n" );
				writeAuth( new, entry, &ok );
			}
			XauDisposeAuth( entry );
		}
		fclose( old );
	}
	if (fclose( new ) == EOF)
		ok = FALSE;
	doneAddrs();
	return ok;
}

static void
undoUserAuth( const char *name, const char *new_name )
{
	LogWarn( "Can't save user authorization in home dir\n" );
	unlink( new_name );
	XauUnlockAuth( name );
}

static char *
moveUserAuth( const char *name, char *new_name, char *envname )
{
	if (unlink( name ))
		Debug( "unlink %s failed\n", name );
	if (link( new_name, name )) {
		Debug( "link failed %s %s\n", new_name, name );
		LogError( "Can't move user authorization into place\n" );
		envname = new_name;
	} else {
		Debug( "new authorization moved into place\n" );
		unlink( new_name );
	}
	XauUnlockAuth( name );
	return envname;
}

void
SetUserAuthorization( struct display *d )
{
	FILE *old, *new;
	char *name;
	char *envname;
	Xauth **auths;
	int i, ok;
	int magicCookie;
	int data_len;
	char name_buf[NBSIZE], new_name[NBSIZE + 2];

	Debug( "SetUserAuthorization\n" );
	auths = d->authorizations;
	if (auths) {
		startUserAuth( name_buf, new_name, &old, &new );
		if (new) {
			envname = 0;
			name = name_buf;
		} else {
		  fallback:
			if (strlen( d->userAuthDir ) >= NBSIZE - 13)
				return;
			/*
			 * Note, that we don't lock the auth file here, as it's
			 * temporary - we can assume, that we are the only ones
			 * knowing about this file anyway.
			 */
			i = sprintf( name_buf, "%s/.Xauth", d->userAuthDir );
			new = mkTempFile( name_buf, i );
			if (!new) {
				LogError( "Can't create authorization file in %s\n",
				          d->userAuthDir );
				return;
			}
			name = 0;
			envname = name_buf;
			old = 0;
		}
		ok = TRUE;
		Debug( "%d authorization protocols for %s\n", d->authNum, d->name );
		/*
		 * Write MIT-MAGIC-COOKIE-1 authorization first, so that
		 * R4 clients which only knew that, and used the first
		 * matching entry will continue to function
		 */
		magicCookie = -1;
		for (i = 0; i < d->authNum; i++) {
			if (auths[i]->name_length == 18 &&
			    !memcmp( auths[i]->name, "MIT-MAGIC-COOKIE-1", 18 ))
			{
				magicCookie = i;
				if ((d->displayType & d_location) == dLocal)
					writeLocalAuth( new, auths[i], d->name, &ok );
#ifdef XDMCP
				else
					writeRemoteAuth( new, auths[i], (XdmcpNetaddr)d->peer.data,
					                 d->peer.length, d->name, &ok );
#endif
				break;
			}
		}
		/* now write other authorizations */
		for (i = 0; i < d->authNum; i++) {
			if (i != magicCookie) {
				data_len = auths[i]->data_length;
				/* client will just use default Kerberos cache, so don't
				 * even write cache info into the authority file.
				 */
				if (auths[i]->name_length == 14 &&
				    !strncmp( auths[i]->name, "MIT-KERBEROS-5", 14 ))
					auths[i]->data_length = 0;
				if ((d->displayType & d_location) == dLocal)
					writeLocalAuth( new, auths[i], d->name, &ok );
#ifdef XDMCP
				else
					writeRemoteAuth( new, auths[i], (XdmcpNetaddr)d->peer.data,
					                 d->peer.length, d->name, &ok );
#endif
				auths[i]->data_length = data_len;
			}
		}
		if (!endUserAuth( old, new, new_name, ok )) {
			if (!name) {
				LogError( "Can't save user authorization\n" );
				return;
			}
			undoUserAuth( name, new_name );
			initAddrs();
			goto fallback;
		}
		if (name)
			envname = moveUserAuth( name, new_name, envname );
		if (envname) {
			userEnviron = setEnv( userEnviron, "XAUTHORITY", envname );
			systemEnviron = setEnv( systemEnviron, "XAUTHORITY", envname );
		}
		/* a chown() used to be here, but this code runs as user anyway */
	}
	Debug( "done SetUserAuthorization\n" );
}

void
RemoveUserAuthorization( struct display *d )
{
	Xauth **auths;
	FILE *old, *new;
	int i;
	char name[NBSIZE], new_name[NBSIZE + 2];

	if (!(auths = d->authorizations))
		return;
	Debug( "RemoveUserAuthorization\n" );
	startUserAuth( name, new_name, &old, &new );
	if (new) {
		for (i = 0; i < d->authNum; i++) {
			if ((d->displayType & d_location) == dLocal)
				writeLocalAuth( new, auths[i], d->name, 0 );
#ifdef XDMCP
			else
				writeRemoteAuth( new, auths[i], (XdmcpNetaddr)d->peer.data,
				                 d->peer.length, d->name, 0 );
#endif
		}
		if (endUserAuth( old, new, new_name, TRUE ))
			(void)moveUserAuth( name, new_name, 0 );
		else
			undoUserAuth( name, new_name );
	}
	Debug( "done RemoveUserAuthorization\n" );
}