summaryrefslogtreecommitdiffstats
path: root/plugins/sudoers/sudoers.c
blob: db659868eb451a44f1bfd6298e1854756c0da70d (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
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
/*
 * SPDX-License-Identifier: ISC
 *
 * Copyright (c) 1993-1996, 1998-2022 Todd C. Miller <Todd.Miller@sudo.ws>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Sponsored in part by the Defense Advanced Research Projects
 * Agency (DARPA) and Air Force Research Laboratory, Air Force
 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
 */

/*
 * This is an open source non-commercial project. Dear PVS-Studio, please check it.
 * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
 */

#ifdef __TANDEM
# include <floss.h>
#endif

#include <config.h>

#include <sys/types.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pwd.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <netdb.h>
#ifdef HAVE_LOGIN_CAP_H
# include <login_cap.h>
# ifndef LOGIN_DEFROOTCLASS
#  define LOGIN_DEFROOTCLASS	"daemon"
# endif
# ifndef LOGIN_SETENV
#  define LOGIN_SETENV	0
# endif
#endif
#ifdef HAVE_SELINUX
# include <selinux/selinux.h>
#endif
#include <ctype.h>
#ifndef HAVE_GETADDRINFO
# include "compat/getaddrinfo.h"
#endif

#include "sudoers.h"
#include "parse.h"
#include "check.h"
#include "auth/sudo_auth.h"
#include "sudo_iolog.h"

/*
 * Prototypes
 */
static int set_cmnd(void);
static bool init_vars(char * const *);
static bool set_loginclass(struct passwd *);
static bool set_runasgr(const char *, bool);
static bool set_runaspw(const char *, bool);
static bool tty_present(void);
static void set_callbacks(void);

/*
 * Globals
 */
struct sudo_user sudo_user;
struct passwd *list_pw;
uid_t timestamp_uid;
gid_t timestamp_gid;
bool force_umask;
int sudo_mode;

static char *prev_user;
static struct sudo_nss_list *snl;
static bool unknown_runas_uid;
static bool unknown_runas_gid;
static int cmnd_status = -1;
static struct defaults_list initial_defaults = TAILQ_HEAD_INITIALIZER(initial_defaults);

#ifdef __linux__
static struct rlimit nproclimit;
#endif

/* XXX - must be extern for audit bits of sudo_auth.c */
int NewArgc;
char **NewArgv;
char **saved_argv;

#ifdef SUDOERS_LOG_CLIENT
# define remote_iologs	(!SLIST_EMPTY(&def_log_servers))
#else
# define remote_iologs	0
#endif

/*
 * Unlimit the number of processes since Linux's setuid() will
 * apply resource limits when changing uid and return EAGAIN if
 * nproc would be exceeded by the uid switch.
 */
static void
unlimit_nproc(void)
{
#ifdef __linux__
    struct rlimit rl;
    debug_decl(unlimit_nproc, SUDOERS_DEBUG_UTIL);

    if (getrlimit(RLIMIT_NPROC, &nproclimit) != 0)
	    sudo_warn("getrlimit(RLIMIT_NPROC)");
    rl.rlim_cur = rl.rlim_max = RLIM_INFINITY;
    if (setrlimit(RLIMIT_NPROC, &rl) != 0) {
	rl.rlim_cur = rl.rlim_max = nproclimit.rlim_max;
	if (setrlimit(RLIMIT_NPROC, &rl) != 0)
	    sudo_warn("setrlimit(RLIMIT_NPROC)");
    }
    debug_return;
#endif /* __linux__ */
}

/*
 * Restore saved value of RLIMIT_NPROC.
 */
static void
restore_nproc(void)
{
#ifdef __linux__
    debug_decl(restore_nproc, SUDOERS_DEBUG_UTIL);

    if (setrlimit(RLIMIT_NPROC, &nproclimit) != 0)
	sudo_warn("setrlimit(RLIMIT_NPROC)");

    debug_return;
#endif /* __linux__ */
}

/*
 * Re-initialize Defaults settings.
 * We do not warn, log or send mail for errors when reinitializing,
 * this would have already been done the first time through.
 */
static bool
sudoers_reinit_defaults(void)
{
    struct sudo_nss *nss, *nss_next;
    sudoers_logger_t logger = sudoers_error_hook;
    debug_decl(sudoers_reinit_defaults, SUDOERS_DEBUG_PLUGIN);

    if (!init_defaults()) {
	sudo_warnx("%s", U_("unable to initialize sudoers default values"));
	debug_return_bool(false);
    }

    /* It should not be possible for the initial defaults to fail to apply. */
    if (!update_defaults(NULL, &initial_defaults,
	    SETDEF_GENERIC|SETDEF_HOST|SETDEF_USER|SETDEF_RUNAS, false))
	debug_return_bool(false);

    /* Disable error logging while re-processing defaults. */
    sudoers_error_hook = NULL;

    TAILQ_FOREACH_SAFE(nss, snl, entries, nss_next) {
	/* Missing/invalid defaults is not a fatal error. */
	if (nss->getdefs(nss) != -1) {
	    (void)update_defaults(nss->parse_tree, NULL,
		SETDEF_GENERIC|SETDEF_HOST|SETDEF_USER|SETDEF_RUNAS, true);
	}
    }

    /* Restore error logging. */
    sudoers_error_hook = logger;

    /* No need to check the admin flag file multiple times. */
    if (ISSET(sudo_mode, MODE_POLICY_INTERCEPTED))
	def_admin_flag = NULL;

    debug_return_bool(true);
}

int
sudoers_init(void *info, sudoers_logger_t logger, char * const envp[])
{
    struct sudo_nss *nss, *nss_next;
    int oldlocale, sources = 0;
    static int ret = -1;
    debug_decl(sudoers_init, SUDOERS_DEBUG_PLUGIN);

    /* Only initialize once. */
    if (snl != NULL)
	debug_return_int(ret);

    bindtextdomain("sudoers", LOCALEDIR);

    /* Hook up logging function for parse errors. */
    sudoers_error_hook = logger;

    /* Register fatal/fatalx callback. */
    sudo_fatal_callback_register(sudoers_cleanup);

    /* Initialize environment functions (including replacements). */
    if (!env_init(envp))
	debug_return_int(-1);

    /* Setup defaults data structures. */
    if (!init_defaults()) {
	sudo_warnx("%s", U_("unable to initialize sudoers default values"));
	debug_return_int(-1);
    }

    /* Parse info from front-end. */
    sudo_mode = sudoers_policy_deserialize_info(info, &initial_defaults);
    if (ISSET(sudo_mode, MODE_ERROR))
	debug_return_int(-1);

    if (!init_vars(envp))
	debug_return_int(-1);

    /* Parse nsswitch.conf for sudoers order. */
    snl = sudo_read_nss();

    /* LDAP or NSS may modify the euid so we need to be root for the open. */
    if (!set_perms(PERM_ROOT))
	debug_return_int(-1);

    /* Use the C locale unless another is specified in sudoers. */
    sudoers_setlocale(SUDOERS_LOCALE_SUDOERS, &oldlocale);
    sudo_warn_set_locale_func(sudoers_warn_setlocale);

    /* Update defaults set by front-end. */
    if (!update_defaults(NULL, &initial_defaults,
	    SETDEF_GENERIC|SETDEF_HOST|SETDEF_USER|SETDEF_RUNAS, false)) {
	goto cleanup;
    }

    /* Open and parse sudoers, set global defaults.  */
    init_parser(sudoers_file, false, false);
    TAILQ_FOREACH_SAFE(nss, snl, entries, nss_next) {
	if (nss->open(nss) == -1 || (nss->parse_tree = nss->parse(nss)) == NULL) {
	    TAILQ_REMOVE(snl, nss, entries);
	    continue;
	}
	sources++;

	/* Missing/invalid defaults is not a fatal error. */
	if (nss->getdefs(nss) == -1) {
	    log_warningx(SLOG_SEND_MAIL|SLOG_NO_STDERR,
		N_("unable to get defaults from %s"), nss->source);
	} else {
	    (void)update_defaults(nss->parse_tree, NULL,
		SETDEF_GENERIC|SETDEF_HOST|SETDEF_USER|SETDEF_RUNAS, false);
	}
    }
    if (sources == 0) {
	sudo_warnx("%s", U_("no valid sudoers sources found, quitting"));
	goto cleanup;
    }

    /* Set login class if applicable (after sudoers is parsed). */
    if (set_loginclass(runas_pw ? runas_pw : sudo_user.pw))
	ret = true;

cleanup:
    mail_parse_errors();

    if (!restore_perms())
	ret = -1;

    /* Restore user's locale. */
    sudo_warn_set_locale_func(NULL);
    sudoers_setlocale(oldlocale, NULL);

    debug_return_int(ret);
}

/*
 * Expand I/O log dir and file into a full path.
 * Returns the full I/O log path prefixed with "iolog_path=".
 * Sets sudo_user.iolog_file as a side effect.
 */
static char *
format_iolog_path(void)
{
    char dir[PATH_MAX], file[PATH_MAX];
    char *iolog_path = NULL;
    int oldlocale;
    bool ok;
    debug_decl(format_iolog_path, SUDOERS_DEBUG_PLUGIN);

    /* Use sudoers locale for strftime() */
    sudoers_setlocale(SUDOERS_LOCALE_SUDOERS, &oldlocale);
    ok = expand_iolog_path(def_iolog_dir, dir, sizeof(dir),
	&sudoers_iolog_path_escapes[1], NULL);
    if (ok) {
	ok = expand_iolog_path(def_iolog_file, file, sizeof(file),
	    &sudoers_iolog_path_escapes[0], dir);
    }
    sudoers_setlocale(oldlocale, NULL);
    if (!ok)
	goto done;

    if (asprintf(&iolog_path, "iolog_path=%s/%s", dir, file) == -1) {
	iolog_path = NULL;
	goto done;
    }

    /* Stash pointer to the I/O log for the event log. */
    sudo_user.iolog_path = iolog_path + sizeof("iolog_path=") - 1;
    sudo_user.iolog_file = sudo_user.iolog_path + 1 + strlen(dir);

done:
    debug_return_str(iolog_path);
}

static int
check_user_runchroot(void)
{
    debug_decl(check_user_runchroot, SUDOERS_DEBUG_PLUGIN);

    if (user_runchroot == NULL)
	debug_return_bool(true);

    sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
	"def_runchroot %s, user_runchroot %s",
	def_runchroot ? def_runchroot : "none",
	user_runchroot ? user_runchroot : "none");

    if (def_runchroot == NULL || (strcmp(def_runchroot, "*") != 0 &&
	    strcmp(def_runchroot, user_runchroot) != 0)) {
	log_warningx(SLOG_NO_STDERR|SLOG_AUDIT,
	    N_("user not allowed to change root directory to %s"),
	    user_runchroot);
	sudo_warnx(U_("you are not permitted to use the -R option with %s"),
	    user_cmnd);
	debug_return_bool(false);
    }
    free(def_runchroot);
    if ((def_runchroot = strdup(user_runchroot)) == NULL) {
	sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
	debug_return_int(-1);
    }
    debug_return_bool(true);
}

static int
check_user_runcwd(void)
{
    debug_decl(check_user_runcwd, SUDOERS_DEBUG_PLUGIN);

    sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
	"def_runcwd %s, user_runcwd %s, user_cwd %s",
	def_runcwd ? def_runcwd : "none", user_runcwd ? user_runcwd : "none",
	user_cwd ? user_cwd : "none");

    if (strcmp(user_cwd, user_runcwd) != 0) {
	if (def_runcwd == NULL || strcmp(def_runcwd, "*") != 0) {
	    log_warningx(SLOG_NO_STDERR|SLOG_AUDIT,
		N_("user not allowed to change directory to %s"), user_runcwd);
	    sudo_warnx(U_("you are not permitted to use the -D option with %s"),
		user_cmnd);
	    debug_return_bool(false);
	}
	free(def_runcwd);
	if ((def_runcwd = strdup(user_runcwd)) == NULL) {
	    sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
	    debug_return_int(-1);
	}
    }
    debug_return_bool(true);
}

static bool need_reinit;

int
sudoers_policy_main(int argc, char * const argv[], int pwflag, char *env_add[],
    bool verbose, void *closure)
{
    char *iolog_path = NULL;
    mode_t cmnd_umask = ACCESSPERMS;
    int oldlocale, validated, ret = -1;
    debug_decl(sudoers_policy_main, SUDOERS_DEBUG_PLUGIN);

    sudo_warn_set_locale_func(sudoers_warn_setlocale);

    if (argc == 0) {
	sudo_warnx("%s", U_("no command specified"));
	debug_return_int(-1);
    }

    if (need_reinit) {
	/* Was previous command intercepted? */
	if (ISSET(sudo_mode, MODE_RUN) && def_intercept)
	    SET(sudo_mode, MODE_POLICY_INTERCEPTED);

	/* Only certain mode flags are legal for intercepted commands. */
	if (ISSET(sudo_mode, MODE_POLICY_INTERCEPTED))
	    sudo_mode &= MODE_INTERCEPT_MASK;

	/* Re-initialize defaults if we are called multiple times. */
	if (!sudoers_reinit_defaults())
	    debug_return_int(-1);
    }
    need_reinit = true;

    unlimit_nproc();

    /* Is root even allowed to run sudo? */
    if (user_uid == 0 && !def_root_sudo) {
	/* Not an audit event (should it be?). */
	sudo_warnx("%s",
	    U_("sudoers specifies that root is not allowed to sudo"));
	goto bad;
    }

    if (!set_perms(PERM_INITIAL))
	goto bad;

    /* Environment variables specified on the command line. */
    if (env_add != NULL && env_add[0] != NULL)
	sudo_user.env_vars = env_add;

    /*
     * Make a local copy of argc/argv, with special handling for the
     * '-i' option.  We also allocate an extra slot for bash's --login.
     */
    if (NewArgv != NULL && NewArgv != saved_argv) {
	sudoers_gc_remove(GC_PTR, NewArgv);
	free(NewArgv);
    }
    NewArgv = reallocarray(NULL, argc + 2, sizeof(char *));
    if (NewArgv == NULL) {
	sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
	goto done;
    }
    sudoers_gc_add(GC_PTR, NewArgv);
    if (ISSET(sudo_mode, MODE_CHECK)) {
	/* For "sudo -l [-U otheruser] command" */
	NewArgv[0] = (char *)"list";
	memcpy(NewArgv + 1, argv, argc * sizeof(char *));
	NewArgc = argc + 1;
    } else {
	memcpy(NewArgv, argv, argc * sizeof(char *));
	NewArgc = argc;
    }
    NewArgv[NewArgc] = NULL;
    if (ISSET(sudo_mode, MODE_LOGIN_SHELL) && runas_pw != NULL) {
	NewArgv[0] = strdup(runas_pw->pw_shell);
	if (NewArgv[0] == NULL) {
	    sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
	    goto done;
	}
	sudoers_gc_add(GC_PTR, NewArgv[0]);
    }

    /* If given the -P option, set the "preserve_groups" flag. */
    if (ISSET(sudo_mode, MODE_PRESERVE_GROUPS))
	def_preserve_groups = true;

    /* Find command in path and apply per-command Defaults. */
    cmnd_status = set_cmnd();
    if (cmnd_status == NOT_FOUND_ERROR)
	goto done;

    /* Check for -C overriding def_closefrom. */
    if (user_closefrom >= 0 && user_closefrom != def_closefrom) {
	if (!def_closefrom_override) {
	    log_warningx(SLOG_NO_STDERR|SLOG_AUDIT,
		N_("user not allowed to override closefrom limit"));
	    sudo_warnx("%s", U_("you are not permitted to use the -C option"));
	    goto bad;
	}
	def_closefrom = user_closefrom;
    }

    /*
     * Check sudoers sources, using the locale specified in sudoers.
     */
    sudoers_setlocale(SUDOERS_LOCALE_SUDOERS, &oldlocale);
    validated = sudoers_lookup(snl, sudo_user.pw, &cmnd_status, pwflag);
    if (ISSET(validated, VALIDATE_ERROR)) {
	/* The lookup function should have printed an error. */
	goto done;
    }

    /* Restore user's locale. */
    sudoers_setlocale(oldlocale, NULL);

    if (safe_cmnd == NULL) {
	if ((safe_cmnd = strdup(user_cmnd)) == NULL) {
	    sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
	    goto done;
	}
    }

    /* Defer uid/gid checks until after defaults have been updated. */
    if (unknown_runas_uid && !def_runas_allow_unknown_id) {
	log_warningx(SLOG_AUDIT, N_("unknown user %s"), runas_pw->pw_name);
	goto done;
    }
    if (runas_gr != NULL) {
	if (unknown_runas_gid && !def_runas_allow_unknown_id) {
	    log_warningx(SLOG_AUDIT, N_("unknown group %s"),
		runas_gr->gr_name);
	    goto done;
	}
    }

    /*
     * Look up the timestamp dir owner if one is specified.
     */
    if (def_timestampowner) {
	struct passwd *pw = NULL;

	if (*def_timestampowner == '#') {
	    const char *errstr;
	    uid_t uid = sudo_strtoid(def_timestampowner + 1, &errstr);
	    if (errstr == NULL)
		pw = sudo_getpwuid(uid);
	}
	if (pw == NULL)
	    pw = sudo_getpwnam(def_timestampowner);
	if (pw != NULL) {
	    timestamp_uid = pw->pw_uid;
	    timestamp_gid = pw->pw_gid;
	    sudo_pw_delref(pw);
	} else {
	    /* XXX - audit too? */
	    log_warningx(SLOG_SEND_MAIL,
		N_("timestamp owner (%s): No such user"), def_timestampowner);
	    timestamp_uid = ROOT_UID;
	    timestamp_gid = ROOT_GID;
	}
    }

    /* If no command line args and "shell_noargs" is not set, error out. */
    if (ISSET(sudo_mode, MODE_IMPLIED_SHELL) && !def_shell_noargs) {
	/* Not an audit event. */
	ret = -2; /* usage error */
	goto done;
    }

    /* Bail if a tty is required and we don't have one.  */
    if (def_requiretty && !tty_present()) {
	log_warningx(SLOG_NO_STDERR|SLOG_AUDIT, N_("no tty"));
	sudo_warnx("%s", U_("sorry, you must have a tty to run sudo"));
	goto bad;
    }

    /* Check runas user's shell. */
    if (!check_user_shell(runas_pw)) {
	log_warningx(SLOG_RAW_MSG|SLOG_AUDIT,
	    N_("invalid shell for user %s: %s"),
	    runas_pw->pw_name, runas_pw->pw_shell);
	goto bad;
    }

    /*
     * We don't reset the environment for sudoedit or if the user
     * specified the -E command line flag and they have setenv privs.
     */
    if (ISSET(sudo_mode, MODE_EDIT) ||
	(ISSET(sudo_mode, MODE_PRESERVE_ENV) && def_setenv))
	def_env_reset = false;

    /* Build a new environment that avoids any nasty bits. */
    if (!rebuild_env())
	goto bad;

    /* Require a password if sudoers says so.  */
    switch (check_user(validated, sudo_mode)) {
    case true:
	/* user authenticated successfully. */
	break;
    case false:
	/* Note: log_denial() calls audit for us. */
	if (!ISSET(validated, VALIDATE_SUCCESS)) {
	    /* Only display a denial message if no password was read. */
	    if (!log_denial(validated, def_passwd_tries <= 0))
		goto done;
	}
	goto bad;
    default:
	/* some other error, ret is -1. */
	goto done;
    }

    /* Check whether user_runchroot is permitted (if specified). */
    switch (check_user_runchroot()) {
    case true:
	break;
    case false:
	goto bad;
    default:
	goto done;
    }

    /* Check whether user_runcwd is permitted (if specified). */
    switch (check_user_runcwd()) {
    case true:
	break;
    case false:
	goto bad;
    default:
	goto done;
    }

    /* If run as root with SUDO_USER set, set sudo_user.pw to that user. */
    /* XXX - causes confusion when root is not listed in sudoers */
    if (ISSET(sudo_mode, MODE_RUN|MODE_EDIT) && prev_user != NULL) {
	if (user_uid == 0 && strcmp(prev_user, "root") != 0) {
	    struct passwd *pw;

	    if ((pw = sudo_getpwnam(prev_user)) != NULL) {
		    if (sudo_user.pw != NULL)
			sudo_pw_delref(sudo_user.pw);
		    sudo_user.pw = pw;
	    }
	}
    }

    /* If the user was not allowed to run the command we are done. */
    if (!ISSET(validated, VALIDATE_SUCCESS)) {
	/* Note: log_failure() calls audit for us. */
	if (!log_failure(validated, cmnd_status))
	    goto done;
	goto bad;
    }

    /* Create Ubuntu-style dot file to indicate sudo was successful. */
    if (create_admin_success_flag() == -1)
	goto done;

    /* Finally tell the user if the command did not exist. */
    if (cmnd_status == NOT_FOUND_DOT) {
	audit_failure(NewArgv, N_("command in current directory"));
	sudo_warnx(U_("ignoring \"%s\" found in '.'\nUse \"sudo ./%s\" if this is the \"%s\" you wish to run."), user_cmnd, user_cmnd, user_cmnd);
	goto bad;
    } else if (cmnd_status == NOT_FOUND) {
	if (ISSET(sudo_mode, MODE_CHECK)) {
	    audit_failure(NewArgv, N_("%s: command not found"),
		NewArgv[1]);
	    sudo_warnx(U_("%s: command not found"), NewArgv[1]);
	} else {
	    audit_failure(NewArgv, N_("%s: command not found"),
		user_cmnd);
	    sudo_warnx(U_("%s: command not found"), user_cmnd);
	    if (strncmp(user_cmnd, "cd", 2) == 0 && (user_cmnd[2] == '\0' ||
		    isblank((unsigned char)user_cmnd[2]))) {
		sudo_warnx("%s",
		    U_("\"cd\" is a shell built-in command, it cannot be run directly."));
		sudo_warnx("%s",
		    U_("the -s option may be used to run a privileged shell."));
		sudo_warnx("%s",
		    U_("the -D option may be used to run a command in a specific directory."));
	    }
	}
	goto bad;
    }

    /* If user specified a timeout make sure sudoers allows it. */
    if (!def_user_command_timeouts && user_timeout > 0) {
	log_warningx(SLOG_NO_STDERR|SLOG_AUDIT,
	    N_("user not allowed to set a command timeout"));
	sudo_warnx("%s",
	    U_("sorry, you are not allowed set a command timeout"));
	goto bad;
    }

    /* If user specified env vars make sure sudoers allows it. */
    if (ISSET(sudo_mode, MODE_RUN) && !def_setenv) {
	if (ISSET(sudo_mode, MODE_PRESERVE_ENV)) {
	    log_warningx(SLOG_NO_STDERR|SLOG_AUDIT,
		N_("user not allowed to preserve the environment"));
	    sudo_warnx("%s",
		U_("sorry, you are not allowed to preserve the environment"));
	    goto bad;
	} else {
	    if (!validate_env_vars(sudo_user.env_vars))
		goto bad;
	}
    }

    if (ISSET(sudo_mode, (MODE_RUN | MODE_EDIT)) && !remote_iologs) {
	if (iolog_enabled && def_iolog_file && def_iolog_dir) {
	    if ((iolog_path = format_iolog_path()) == NULL) {
		if (!def_ignore_iolog_errors)
		    goto done;
		/* Unable to expand I/O log path, disable I/O logging. */
		def_log_input = false;
		def_log_output = false;
		def_log_stdin = false;
		def_log_stdout = false;
		def_log_stderr = false;
		def_log_ttyin = false;
		def_log_ttyout = false;
	    }
	}
    }

    switch (sudo_mode & MODE_MASK) {
	case MODE_CHECK:
	    ret = display_cmnd(snl, list_pw ? list_pw : sudo_user.pw);
	    goto done;
	case MODE_LIST:
	    ret = display_privs(snl, list_pw ? list_pw : sudo_user.pw, verbose);
	    goto done;
	case MODE_VALIDATE:
	    ret = true;
	    goto done;
	case MODE_RUN:
	case MODE_EDIT:
	    /* ret will not be set until the very end. */
	    break;
	default:
	    /* Should not happen. */
	    sudo_warnx("internal error, unexpected sudo mode 0x%x", sudo_mode);
	    goto done;
    }

    /*
     * Set umask based on sudoers.
     * If user's umask is more restrictive, OR in those bits too
     * unless umask_override is set.
     */
    if (def_umask != ACCESSPERMS) {
	cmnd_umask = def_umask;
	if (!def_umask_override)
	    cmnd_umask |= user_umask;
    }

    if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
	char *p;

	/* Convert /bin/sh -> -sh so shell knows it is a login shell */
	if ((p = strrchr(NewArgv[0], '/')) == NULL)
	    p = NewArgv[0];
	*p = '-';
	NewArgv[0] = p;

	/*
	 * Newer versions of bash require the --login option to be used
	 * in conjunction with the -c option even if the shell name starts
	 * with a '-'.  Unfortunately, bash 1.x uses -login, not --login
	 * so this will cause an error for that.
	 */
	if (NewArgc > 1 && strcmp(NewArgv[0], "-bash") == 0 &&
	    strcmp(NewArgv[1], "-c") == 0) {
	    /* We allocated extra space for the --login above. */
	    memmove(&NewArgv[2], &NewArgv[1], sizeof(char *) * NewArgc);
	    NewArgv[1] = (char *)"--login";
	    NewArgc++;
	}

#if defined(_AIX) || (defined(__linux__) && !defined(HAVE_PAM))
	/* Insert system-wide environment variables. */
	if (!read_env_file(_PATH_ENVIRONMENT, true, false))
	    sudo_warn("%s", _PATH_ENVIRONMENT);
#endif
#ifdef HAVE_LOGIN_CAP_H
	/* Set environment based on login class. */
	if (login_class) {
	    login_cap_t *lc = login_getclass(login_class);
	    if (lc != NULL) {
		setusercontext(lc, runas_pw, runas_pw->pw_uid, LOGIN_SETPATH|LOGIN_SETENV);
		login_close(lc);
	    }
	}
#endif /* HAVE_LOGIN_CAP_H */
    }

    /* Insert system-wide environment variables. */
    if (def_restricted_env_file) {
	if (!read_env_file(def_restricted_env_file, false, true))
	    sudo_warn("%s", def_restricted_env_file);
    }
    if (def_env_file) {
	if (!read_env_file(def_env_file, false, false))
	    sudo_warn("%s", def_env_file);
    }

    /* Insert user-specified environment variables. */
    if (!insert_env_vars(sudo_user.env_vars)) {
	sudo_warnx("%s",
	    U_("error setting user-specified environment variables"));
	goto done;
    }

    /* Note: must call audit before uid change. */
    if (ISSET(sudo_mode, MODE_EDIT)) {
	const char *env_editor = NULL;
	char **edit_argv;
	int edit_argc;

	sudoedit_nfiles = NewArgc - 1;
	free(safe_cmnd);
	safe_cmnd = find_editor(sudoedit_nfiles, NewArgv + 1, &edit_argc,
	    &edit_argv, NULL, &env_editor);
	if (safe_cmnd == NULL) {
	    switch (errno) {
	    case ENOENT:
		audit_failure(NewArgv, N_("%s: command not found"),
		    env_editor ? env_editor : def_editor);
		sudo_warnx(U_("%s: command not found"),
		    env_editor ? env_editor : def_editor);
		goto bad;
	    case EINVAL:
		if (def_env_editor && env_editor != NULL) {
		    /* User tried to do something funny with the editor. */
		    log_warningx(SLOG_NO_STDERR|SLOG_AUDIT|SLOG_SEND_MAIL,
			"invalid user-specified editor: %s", env_editor);
		    goto bad;
		}
		FALLTHROUGH;
	    default:
		goto done;
	    }
	}
	/* find_editor() already g/c'd edit_argv[] */
	if (NewArgv != saved_argv) {
	    sudoers_gc_remove(GC_PTR, NewArgv);
	    free(NewArgv);
	}
	NewArgv = edit_argv;
	NewArgc = edit_argc;

	/* We want to run the editor with the unmodified environment. */
	env_swap_old();
    }

    /* Save the initial command and argv so we have it for exit logging. */
    if (saved_cmnd == NULL) {
	saved_cmnd = strdup(safe_cmnd);
	if (saved_cmnd == NULL) {
	    sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
	    goto done;
	}
	saved_argv = NewArgv;
    }

    ret = true;
    goto done;

bad:
    ret = false;

done:
    mail_parse_errors();

    if (def_group_plugin)
	group_plugin_unload();
    init_parser(NULL, false, false);

    if (ret == -1) {
	/* Free stashed copy of the environment. */
	(void)env_init(NULL);

	/* Free locally-allocated strings. */
	free(iolog_path);
    } else {
	/* Store settings to pass back to front-end. */
	if (!sudoers_policy_store_result(ret, NewArgv, env_get(), cmnd_umask,
		iolog_path, closure))
	    ret = -1;
    }

    if (!rewind_perms())
	ret = -1;

    restore_nproc();

    sudo_warn_set_locale_func(NULL);

    debug_return_int(ret);
}

/*
 * Initialize timezone and fill in sudo_user struct.
 */
static bool
init_vars(char * const envp[])
{
    char * const * ep;
    bool unknown_user = false;
    debug_decl(init_vars, SUDOERS_DEBUG_PLUGIN);

    if (!sudoers_initlocale(setlocale(LC_ALL, NULL), def_sudoers_locale)) {
	sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
	debug_return_bool(false);
    }

#define MATCHES(s, v)	\
    (strncmp((s), (v), sizeof(v) - 1) == 0 && (s)[sizeof(v) - 1] != '\0')

    for (ep = envp; *ep; ep++) {
	switch (**ep) {
	    case 'K':
		if (MATCHES(*ep, "KRB5CCNAME="))
		    user_ccname = *ep + sizeof("KRB5CCNAME=") - 1;
		break;
	    case 'P':
		if (MATCHES(*ep, "PATH="))
		    user_path = *ep + sizeof("PATH=") - 1;
		break;
	    case 'S':
		if (MATCHES(*ep, "SUDO_PROMPT=")) {
		    /* Don't override "sudo -p prompt" */
		    if (user_prompt == NULL)
			user_prompt = *ep + sizeof("SUDO_PROMPT=") - 1;
		    break;
		}
		if (MATCHES(*ep, "SUDO_USER="))
		    prev_user = *ep + sizeof("SUDO_USER=") - 1;
		break;
	    }
    }
#undef MATCHES

    /*
     * Get a local copy of the user's passwd struct and group list if we
     * don't already have them.
     */
    if (sudo_user.pw == NULL) {
	if ((sudo_user.pw = sudo_getpwnam(user_name)) == NULL) {
	    /*
	     * It is not unusual for users to place "sudo -k" in a .logout
	     * file which can cause sudo to be run during reboot after the
	     * YP/NIS/NIS+/LDAP/etc daemon has died.
	     */
	    if (sudo_mode == MODE_KILL || sudo_mode == MODE_INVALIDATE) {
		sudo_warnx(U_("unknown uid %u"), (unsigned int) user_uid);
		debug_return_bool(false);
	    }

	    /* Need to make a fake struct passwd for the call to log_warningx(). */
	    sudo_user.pw = sudo_mkpwent(user_name, user_uid, user_gid, NULL, NULL);
	    unknown_user = true;
	}
    }
    if (user_gid_list == NULL)
	user_gid_list = sudo_get_gidlist(sudo_user.pw, ENTRY_TYPE_ANY);

    /* Store initialize permissions so we can restore them later. */
    if (!set_perms(PERM_INITIAL))
	debug_return_bool(false);

    /* Set parse callbacks */
    set_callbacks();

    /* It is now safe to use log_warningx() and set_perms() */
    if (unknown_user) {
	log_warningx(SLOG_SEND_MAIL, N_("unknown uid %u"),
	    (unsigned int) user_uid);
	debug_return_bool(false);
    }

    /*
     * Set runas passwd/group entries based on command line or sudoers.
     * Note that if runas_group was specified without runas_user we
     * run the command as the invoking user.
     */
    if (sudo_user.runas_group != NULL) {
	if (!set_runasgr(sudo_user.runas_group, false))
	    debug_return_bool(false);
	if (!set_runaspw(sudo_user.runas_user ?
		sudo_user.runas_user : user_name, false))
	    debug_return_bool(false);
    } else {
	if (!set_runaspw(sudo_user.runas_user ?
		sudo_user.runas_user : def_runas_default, false))
	    debug_return_bool(false);
    }

    debug_return_bool(true);
}

/*
 * Fill in user_cmnd and user_stat variables.
 * Does not fill in user_base.
 */
int
set_cmnd_path(const char *runchroot)
{
    const char *cmnd_in;
    char *cmnd_out = NULL;
    char *path = user_path;
    int ret;
    debug_decl(set_cmnd_path, SUDOERS_DEBUG_PLUGIN);

    cmnd_in = ISSET(sudo_mode, MODE_CHECK) ? NewArgv[1] : NewArgv[0];

    free(list_cmnd);
    list_cmnd = NULL;
    free(user_cmnd);
    user_cmnd = NULL;
    if (def_secure_path && !user_is_exempt())
	path = def_secure_path;
    if (!set_perms(PERM_RUNAS))
	goto error;
    ret = find_path(cmnd_in, &cmnd_out, user_stat, path,
	runchroot, def_ignore_dot, NULL);
    if (!restore_perms())
	goto error;
    if (ret == NOT_FOUND) {
	/* Failed as root, try as invoking user. */
	if (!set_perms(PERM_USER))
	    goto error;
	ret = find_path(cmnd_in, &cmnd_out, user_stat, path,
	    runchroot, def_ignore_dot, NULL);
	if (!restore_perms())
	    goto error;
    }

    if (ISSET(sudo_mode, MODE_CHECK))
	list_cmnd = cmnd_out;
    else
	user_cmnd = cmnd_out;

    debug_return_int(ret);
error:
    free(cmnd_out);
    debug_return_int(NOT_FOUND_ERROR);
}

/*
 * Fill in user_cmnd, user_args, user_base and user_stat variables
 * and apply any command-specific defaults entries.
 */
static int
set_cmnd(void)
{
    struct sudo_nss *nss;
    int ret = FOUND;
    debug_decl(set_cmnd, SUDOERS_DEBUG_PLUGIN);

    /* Allocate user_stat for find_path() and match functions. */
    free(user_stat);
    user_stat = calloc(1, sizeof(struct stat));
    if (user_stat == NULL) {
	sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
	debug_return_int(NOT_FOUND_ERROR);
    }

    /* Re-initialize for when we are called multiple times. */
    free(safe_cmnd);
    safe_cmnd = NULL;

    if (ISSET(sudo_mode, MODE_RUN|MODE_EDIT|MODE_CHECK)) {
	if (!ISSET(sudo_mode, MODE_EDIT)) {
	    const char *runchroot = user_runchroot;
	    if (runchroot == NULL && def_runchroot != NULL &&
		    strcmp(def_runchroot, "*") != 0)
		runchroot = def_runchroot;

	    ret = set_cmnd_path(runchroot);
	    if (ret == NOT_FOUND_ERROR) {
		if (errno == ENAMETOOLONG) {
		    audit_failure(NewArgv, N_("command too long"));
		}
		log_warning(0, "%s", NewArgv[0]);
		debug_return_int(ret);
	    }
	}

	/* set user_args */
	free(user_args);
	user_args = NULL;
	if (ISSET(sudo_mode, MODE_CHECK)) {
	    if (NewArgc > 2) {
		/* Skip the command being listed in NewArgv[1]. */
		user_args = strvec_join(NewArgv + 2, ' ', NULL);
		if (user_args == NULL)
		    debug_return_int(NOT_FOUND_ERROR);
	    }
	} else if (NewArgc > 1) {
	    if (ISSET(sudo_mode, MODE_SHELL|MODE_LOGIN_SHELL) &&
		    ISSET(sudo_mode, MODE_RUN)) {
		/*
		 * When running a command via a shell, the sudo front-end
		 * escapes potential meta chars.  We unescape non-spaces
		 * for sudoers matching and logging purposes.
		 * TODO: move escaping to the policy plugin instead
		 */
		user_args = strvec_join(NewArgv + 1, ' ', strlcpy_unescape);
	    } else {
		user_args = strvec_join(NewArgv + 1, ' ', NULL);
	    }
	    if (user_args == NULL)
		debug_return_int(NOT_FOUND_ERROR);
	}
    }
    if (user_cmnd == NULL) {
	user_cmnd = strdup(NewArgv[0]);
	if (user_cmnd == NULL)
	    debug_return_int(NOT_FOUND_ERROR);
    }
    user_base = sudo_basename(user_cmnd);

    /* Convert "sudo sudoedit" -> "sudoedit" */
    if (ISSET(sudo_mode, MODE_RUN) && strcmp(user_base, "sudoedit") == 0) {
	char *new_cmnd;

	CLR(sudo_mode, MODE_RUN);
	SET(sudo_mode, MODE_EDIT);
	sudo_warnx("%s", U_("sudoedit doesn't need to be run via sudo"));
	if ((new_cmnd = strdup("sudoedit")) == NULL) {
	    sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
	    debug_return_int(NOT_FOUND_ERROR);
	}
	free(user_cmnd);
	user_base = user_cmnd = new_cmnd;
    }

    TAILQ_FOREACH(nss, snl, entries) {
	/* Missing/invalid defaults is not a fatal error. */
	(void)update_defaults(nss->parse_tree, NULL, SETDEF_CMND, false);
    }

    debug_return_int(ret);
}

/*
 * Open sudoers file and check mode/owner/type.
 * Returns a handle to the sudoers file or NULL on error.
 */
FILE *
open_sudoers(const char *file, bool doedit, bool *keepopen)
{
    FILE *fp = NULL;
    struct stat sb;
    int error, fd;
    debug_decl(open_sudoers, SUDOERS_DEBUG_PLUGIN);

    if (!set_perms(PERM_SUDOERS))
	debug_return_ptr(NULL);

again:
    fd = sudo_secure_open_file(file, sudoers_uid, sudoers_gid, &sb, &error);
    if (fd != -1) {
	/*
	 * Make sure we can read the file so we can present the
	 * user with a reasonable error message (unlike the lexer).
	 */
	if ((fp = fdopen(fd, "r")) == NULL) {
	    log_warning(SLOG_SEND_MAIL, N_("unable to open %s"), file);
	    close(fd);
	} else {
	    if (sb.st_size != 0 && fgetc(fp) == EOF) {
		log_warning(SLOG_SEND_MAIL,
		    N_("unable to read %s"), file);
		fclose(fp);
		fp = NULL;
	    } else {
		/* Rewind fp and set close on exec flag. */
		rewind(fp);
		(void) fcntl(fileno(fp), F_SETFD, 1);
	    }
	}
    } else {
	switch (error) {
	case SUDO_PATH_MISSING:
	    /*
	     * If we tried to open sudoers as non-root but got EACCES,
	     * try again as root.
	     */
	    if (errno == EACCES && geteuid() != ROOT_UID) {
		int serrno = errno;
		if (restore_perms()) {
		    if (!set_perms(PERM_ROOT))
			debug_return_ptr(NULL);
		    goto again;
		}
		errno = serrno;
	    }
	    log_warning(SLOG_SEND_MAIL, N_("unable to open %s"), file);
	    break;
	case SUDO_PATH_BAD_TYPE:
	    log_warningx(SLOG_SEND_MAIL,
		N_("%s is not a regular file"), file);
	    break;
	case SUDO_PATH_WRONG_OWNER:
	    log_warningx(SLOG_SEND_MAIL,
		N_("%s is owned by uid %u, should be %u"), file,
		(unsigned int) sb.st_uid, (unsigned int) sudoers_uid);
	    break;
	case SUDO_PATH_WORLD_WRITABLE:
	    log_warningx(SLOG_SEND_MAIL, N_("%s is world writable"), file);
	    break;
	case SUDO_PATH_GROUP_WRITABLE:
	    log_warningx(SLOG_SEND_MAIL,
		N_("%s is owned by gid %u, should be %u"), file,
		(unsigned int) sb.st_gid, (unsigned int) sudoers_gid);
	    break;
	default:
	    sudo_warnx("%s: internal error, unexpected error %d",
		__func__, error);
	    break;
	}
    }

    if (!restore_perms()) {
	/* unable to change back to root */
	if (fp != NULL) {
	    fclose(fp);
	    fp = NULL;
	}
    }

    debug_return_ptr(fp);
}

#ifdef HAVE_LOGIN_CAP_H
static bool
set_loginclass(struct passwd *pw)
{
    const int errflags = SLOG_RAW_MSG;
    login_cap_t *lc;
    bool ret = true;
    debug_decl(set_loginclass, SUDOERS_DEBUG_PLUGIN);

    if (!def_use_loginclass)
	goto done;

    if (login_class && strcmp(login_class, "-") != 0) {
	if (user_uid != 0 && pw->pw_uid != 0) {
	    sudo_warnx(U_("only root can use \"-c %s\""), login_class);
	    ret = false;
	    goto done;
	}
    } else {
	login_class = pw->pw_class;
	if (!login_class || !*login_class)
	    login_class = (char *)
		((pw->pw_uid == 0) ? LOGIN_DEFROOTCLASS : LOGIN_DEFCLASS);
    }

    /* Make sure specified login class is valid. */
    lc = login_getclass(login_class);
    if (!lc || !lc->lc_class || strcmp(lc->lc_class, login_class) != 0) {
	/*
	 * Don't make it an error if the user didn't specify the login
	 * class themselves.  We do this because if login.conf gets
	 * corrupted we want the admin to be able to use sudo to fix it.
	 */
	log_warningx(errflags, N_("unknown login class %s"), login_class);
	def_use_loginclass = false;
	if (login_class)
	    ret = false;
    }
    login_close(lc);
done:
    debug_return_bool(ret);
}
#else
static bool
set_loginclass(struct passwd *pw)
{
    return true;
}
#endif /* HAVE_LOGIN_CAP_H */

#ifndef AI_FQDN
# define AI_FQDN AI_CANONNAME
#endif

/*
 * Look up the fully qualified domain name of host.
 * Use AI_FQDN if available since "canonical" is not always the same as fqdn.
 * Returns 0 on success, setting longp and shortp.
 * Returns non-zero on failure, longp and shortp are unchanged.
 * See gai_strerror() for the list of error return codes.
 */
static int
resolve_host(const char *host, char **longp, char **shortp)
{
    struct addrinfo *res0, hint;
    char *cp, *lname, *sname;
    int ret;
    debug_decl(resolve_host, SUDOERS_DEBUG_PLUGIN);

    memset(&hint, 0, sizeof(hint));
    hint.ai_family = PF_UNSPEC;
    hint.ai_flags = AI_FQDN;

    if ((ret = getaddrinfo(host, NULL, &hint, &res0)) != 0)
	debug_return_int(ret);
    if ((lname = strdup(res0->ai_canonname)) == NULL) {
	freeaddrinfo(res0);
	debug_return_int(EAI_MEMORY);
    }
    if ((cp = strchr(lname, '.')) != NULL) {
	sname = strndup(lname, (size_t)(cp - lname));
	if (sname == NULL) {
	    free(lname);
	    freeaddrinfo(res0);
	    debug_return_int(EAI_MEMORY);
	}
    } else {
	sname = lname;
    }
    freeaddrinfo(res0);
    *longp = lname;
    *shortp = sname;

    debug_return_int(0);
}

/*
 * Look up the fully qualified domain name of user_host and user_runhost.
 * Sets user_host, user_shost, user_runhost and user_srunhost.
 */
static bool
cb_fqdn(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    bool remote;
    int rc;
    char *lhost, *shost;
    debug_decl(cb_fqdn, SUDOERS_DEBUG_PLUGIN);

    /* Nothing to do if fqdn flag is disabled. */
    if (sd_un != NULL && !sd_un->flag)
	debug_return_bool(true);

    /* If the -h flag was given we need to resolve both host and runhost. */
    remote = strcmp(user_runhost, user_host) != 0;

    /* First resolve user_host, setting user_host and user_shost. */
    if (resolve_host(user_host, &lhost, &shost) != 0) {
	if ((rc = resolve_host(user_runhost, &lhost, &shost)) != 0) {
	    gai_log_warning(SLOG_SEND_MAIL|SLOG_RAW_MSG, rc,
		N_("unable to resolve host %s"), user_host);
	    debug_return_bool(false);
	}
    }
    if (user_shost != user_host)
	free(user_shost);
    free(user_host);
    user_host = lhost;
    user_shost = shost;

    /* Next resolve user_runhost, setting user_runhost and user_srunhost. */
    lhost = shost = NULL;
    if (remote) {
	if ((rc = resolve_host(user_runhost, &lhost, &shost)) != 0) {
	    gai_log_warning(SLOG_NO_LOG|SLOG_RAW_MSG, rc,
		N_("unable to resolve host %s"), user_runhost);
	    debug_return_bool(false);
	}
    } else {
	/* Not remote, just use user_host. */
	if ((lhost = strdup(user_host)) != NULL) {
	    if (user_shost != user_host)
		shost = strdup(user_shost);
	    else
		shost = lhost;
	}
	if (lhost == NULL || shost == NULL) {
	    free(lhost);
	    if (lhost != shost)
		free(shost);
	    sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
	    debug_return_bool(false);
	}
    }
    if (lhost != NULL && shost != NULL) {
	if (user_srunhost != user_runhost)
	    free(user_srunhost);
	free(user_runhost);
	user_runhost = lhost;
	user_srunhost = shost;
    }

    sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
	"host %s, shost %s, runhost %s, srunhost %s",
	user_host, user_shost, user_runhost, user_srunhost);
    debug_return_bool(true);
}

/*
 * Get passwd entry for the user we are going to run commands as
 * and store it in runas_pw.  By default, commands run as "root".
 */
static bool
set_runaspw(const char *user, bool quiet)
{
    struct passwd *pw = NULL;
    debug_decl(set_runaspw, SUDOERS_DEBUG_PLUGIN);

    unknown_runas_uid = false;
    if (*user == '#') {
	const char *errstr;
	uid_t uid = sudo_strtoid(user + 1, &errstr);
	if (errstr == NULL) {
	    if ((pw = sudo_getpwuid(uid)) == NULL) {
		unknown_runas_uid = true;
		pw = sudo_fakepwnam(user, user_gid);
	    }
	}
    }
    if (pw == NULL) {
	if ((pw = sudo_getpwnam(user)) == NULL) {
	    if (!quiet)
		log_warningx(SLOG_AUDIT, N_("unknown user %s"), user);
	    debug_return_bool(false);
	}
    }
    if (runas_pw != NULL)
	sudo_pw_delref(runas_pw);
    runas_pw = pw;
    debug_return_bool(true);
}

/*
 * Get group entry for the group we are going to run commands as
 * and store it in runas_gr.
 */
static bool
set_runasgr(const char *group, bool quiet)
{
    struct group *gr = NULL;
    debug_decl(set_runasgr, SUDOERS_DEBUG_PLUGIN);

    unknown_runas_gid = false;
    if (*group == '#') {
	const char *errstr;
	gid_t gid = sudo_strtoid(group + 1, &errstr);
	if (errstr == NULL) {
	    if ((gr = sudo_getgrgid(gid)) == NULL) {
		unknown_runas_gid = true;
		gr = sudo_fakegrnam(group);
	    }
	}
    }
    if (gr == NULL) {
	if ((gr = sudo_getgrnam(group)) == NULL) {
	    if (!quiet)
		log_warningx(SLOG_AUDIT, N_("unknown group %s"), group);
	    debug_return_bool(false);
	}
    }
    if (runas_gr != NULL)
	sudo_gr_delref(runas_gr);
    runas_gr = gr;
    debug_return_bool(true);
}

/*
 * Callback for runas_default sudoers setting.
 */
static bool
cb_runas_default(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    debug_decl(cb_runas_default, SUDOERS_DEBUG_PLUGIN);

    /* Only reset runaspw if user didn't specify one. */
    if (sudo_user.runas_user == NULL && sudo_user.runas_group == NULL)
	debug_return_bool(set_runaspw(sd_un->str, true));
    debug_return_bool(true);
}

/*
 * Callback for tty_tickets sudoers setting.
 */
static bool
cb_tty_tickets(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    debug_decl(cb_tty_tickets, SUDOERS_DEBUG_PLUGIN);

    /* Convert tty_tickets -> timestamp_type */
    if (sd_un->flag)
	def_timestamp_type = tty;
    else
	def_timestamp_type = global;
    debug_return_bool(true);
}

/*
 * Callback for umask sudoers setting.
 */
static bool
cb_umask(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    debug_decl(cb_umask, SUDOERS_DEBUG_PLUGIN);

    /* Force umask if explicitly set in sudoers. */
    force_umask = sd_un->mode != ACCESSPERMS;

    debug_return_bool(true);
}

/*
 * Callback for runchroot sudoers setting.
 */
static bool
cb_runchroot(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    debug_decl(cb_runchroot, SUDOERS_DEBUG_PLUGIN);

    sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
	"def_runchroot now %s", sd_un->str);
    if (user_cmnd != NULL) {
	/* Update user_cmnd based on the new chroot. */
	cmnd_status = set_cmnd_path(sd_un->str);
	sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
	    "user_cmnd now %s", user_cmnd);
    }

    debug_return_bool(true);
}

static bool
cb_logfile(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    int logtype = def_syslog ? EVLOG_SYSLOG : EVLOG_NONE;
    debug_decl(cb_logfile, SUDOERS_DEBUG_PLUGIN);

    if (sd_un->str != NULL)
	SET(logtype, EVLOG_FILE);
    eventlog_set_type(logtype);
    eventlog_set_logpath(sd_un->str);

    debug_return_bool(true);
}

static bool
cb_log_format(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    debug_decl(cb_log_format, SUDOERS_DEBUG_PLUGIN);

    eventlog_set_format(sd_un->tuple == sudo ? EVLOG_SUDO : EVLOG_JSON);

    debug_return_bool(true);
}

static bool
cb_syslog(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    int logtype = def_logfile ? EVLOG_FILE : EVLOG_NONE;
    debug_decl(cb_syslog, SUDOERS_DEBUG_PLUGIN);

    if (sd_un->str != NULL)
	SET(logtype, EVLOG_SYSLOG);
    eventlog_set_type(logtype);

    debug_return_bool(true);
}

static bool
cb_syslog_goodpri(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    debug_decl(cb_syslog_goodpri, SUDOERS_DEBUG_PLUGIN);

    eventlog_set_syslog_acceptpri(sd_un->ival);

    debug_return_bool(true);
}

static bool
cb_syslog_badpri(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    debug_decl(cb_syslog_badpri, SUDOERS_DEBUG_PLUGIN);

    eventlog_set_syslog_rejectpri(sd_un->ival);
    eventlog_set_syslog_alertpri(sd_un->ival);

    debug_return_bool(true);
}

static bool
cb_syslog_maxlen(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    debug_decl(cb_syslog_maxlen, SUDOERS_DEBUG_PLUGIN);

    eventlog_set_syslog_maxlen(sd_un->ival);

    debug_return_bool(true);
}

static bool
cb_loglinelen(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    debug_decl(cb_loglinelen, SUDOERS_DEBUG_PLUGIN);

    eventlog_set_file_maxlen(sd_un->ival);

    debug_return_bool(true);
}

static bool
cb_log_year(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    debug_decl(cb_syslog_maxlen, SUDOERS_DEBUG_PLUGIN);

    eventlog_set_time_fmt(sd_un->flag ? "%h %e %T %Y" : "%h %e %T");

    debug_return_bool(true);
}

static bool
cb_log_host(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    debug_decl(cb_syslog_maxlen, SUDOERS_DEBUG_PLUGIN);

    eventlog_set_omit_hostname(!sd_un->flag);

    debug_return_bool(true);
}

static bool
cb_mailerpath(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    debug_decl(cb_mailerpath, SUDOERS_DEBUG_PLUGIN);

    eventlog_set_mailerpath(sd_un->str);

    debug_return_bool(true);
}

static bool
cb_mailerflags(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    debug_decl(cb_mailerflags, SUDOERS_DEBUG_PLUGIN);

    eventlog_set_mailerflags(sd_un->str);

    debug_return_bool(true);
}

static bool
cb_mailfrom(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    debug_decl(cb_mailfrom, SUDOERS_DEBUG_PLUGIN);

    eventlog_set_mailfrom(sd_un->str);

    debug_return_bool(true);
}

static bool
cb_mailto(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    debug_decl(cb_mailto, SUDOERS_DEBUG_PLUGIN);

    eventlog_set_mailto(sd_un->str);

    debug_return_bool(true);
}

static bool
cb_mailsub(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    debug_decl(cb_mailsub, SUDOERS_DEBUG_PLUGIN);

    eventlog_set_mailsub(sd_un->str);

    debug_return_bool(true);
}

static bool
cb_intercept_type(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    debug_decl(cb_intercept_type, SUDOERS_DEBUG_PLUGIN);

    if (op != -1) {
	/* Set explicitly in sudoers. */
	if (sd_un->tuple == dso) {
	    /* Reset intercept_allow_setid default value. */
	    if (!ISSET(sudo_user.flags, USER_INTERCEPT_SETID))
		def_intercept_allow_setid = false;
	}
    }

    debug_return_bool(true);
}

static bool
cb_intercept_allow_setid(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    debug_decl(cb_intercept_allow_setid, SUDOERS_DEBUG_PLUGIN);

    /* Operator will be -1 if set by front-end. */
    if (op != -1) {
	/* Set explicitly in sudoers. */
	SET(sudo_user.flags, USER_INTERCEPT_SETID);
    }

    debug_return_bool(true);
}

bool
cb_log_input(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    debug_decl(cb_log_input, SUDOERS_DEBUG_PLUGIN);

    def_log_stdin = op;
    def_log_ttyin = op;

    debug_return_bool(true);
}

bool
cb_log_output(const char *file, int line, int column,
    const union sudo_defs_val *sd_un, int op)
{
    debug_decl(cb_log_output, SUDOERS_DEBUG_PLUGIN);

    def_log_stdout = op;
    def_log_stderr = op;
    def_log_ttyout = op;

    debug_return_bool(true);
}

/*
 * Set parse Defaults callbacks.
 * We do this here instead in def_data.in so we don't have to
 * stub out the callbacks for visudo and testsudoers.
 */
static void
set_callbacks(void)
{
    debug_decl(set_callbacks, SUDOERS_DEBUG_PLUGIN);

    /* Set fqdn callback. */
    sudo_defs_table[I_FQDN].callback = cb_fqdn;

    /* Set group_plugin callback. */
    sudo_defs_table[I_GROUP_PLUGIN].callback = cb_group_plugin;

    /* Set runas callback. */
    sudo_defs_table[I_RUNAS_DEFAULT].callback = cb_runas_default;

    /* Set locale callback. */
    sudo_defs_table[I_SUDOERS_LOCALE].callback = sudoers_locale_callback;

    /* Set maxseq callback. */
    sudo_defs_table[I_MAXSEQ].callback = cb_maxseq;

    /* Set iolog_user callback. */
    sudo_defs_table[I_IOLOG_USER].callback = cb_iolog_user;

    /* Set iolog_group callback. */
    sudo_defs_table[I_IOLOG_GROUP].callback = cb_iolog_group;

    /* Set iolog_mode callback. */
    sudo_defs_table[I_IOLOG_MODE].callback = cb_iolog_mode;

    /* Set tty_tickets callback. */
    sudo_defs_table[I_TTY_TICKETS].callback = cb_tty_tickets;

    /* Set umask callback. */
    sudo_defs_table[I_UMASK].callback = cb_umask;

    /* Set runchroot callback. */
    sudo_defs_table[I_RUNCHROOT].callback = cb_runchroot;

    /* eventlog callbacks */
    sudo_defs_table[I_SYSLOG].callback = cb_syslog;
    sudo_defs_table[I_SYSLOG_GOODPRI].callback = cb_syslog_goodpri;
    sudo_defs_table[I_SYSLOG_BADPRI].callback = cb_syslog_badpri;
    sudo_defs_table[I_SYSLOG_MAXLEN].callback = cb_syslog_maxlen;
    sudo_defs_table[I_LOGLINELEN].callback = cb_loglinelen;
    sudo_defs_table[I_LOG_HOST].callback = cb_log_host;
    sudo_defs_table[I_LOGFILE].callback = cb_logfile;
    sudo_defs_table[I_LOG_FORMAT].callback = cb_log_format;
    sudo_defs_table[I_LOG_YEAR].callback = cb_log_year;
    sudo_defs_table[I_MAILERPATH].callback = cb_mailerpath;
    sudo_defs_table[I_MAILERFLAGS].callback = cb_mailerflags;
    sudo_defs_table[I_MAILFROM].callback = cb_mailfrom;
    sudo_defs_table[I_MAILTO].callback = cb_mailto;
    sudo_defs_table[I_MAILSUB].callback = cb_mailsub;
    sudo_defs_table[I_PASSPROMPT_REGEX].callback = cb_passprompt_regex;
    sudo_defs_table[I_INTERCEPT_TYPE].callback = cb_intercept_type;
    sudo_defs_table[I_INTERCEPT_ALLOW_SETID].callback = cb_intercept_allow_setid;
    sudo_defs_table[I_LOG_INPUT].callback = cb_log_input;
    sudo_defs_table[I_LOG_OUTPUT].callback = cb_log_output;

    debug_return;
}

/*
 * Cleanup hook for sudo_fatal()/sudo_fatalx()
 * Also called at policy close time.
 */
void
sudoers_cleanup(void)
{
    struct sudo_nss *nss;
    struct defaults *def;
    debug_decl(sudoers_cleanup, SUDOERS_DEBUG_PLUGIN);

    if (snl != NULL) {
	TAILQ_FOREACH(nss, snl, entries) {
	    nss->close(nss);
	}
	snl = NULL;
	init_parser(NULL, false, false);
    }
    while ((def = TAILQ_FIRST(&initial_defaults)) != NULL) {
	TAILQ_REMOVE(&initial_defaults, def, entries);
	free(def->var);
	free(def->val);
	free(def);
    }
    need_reinit = false;
    if (def_group_plugin)
	group_plugin_unload();
    sudo_user_free();
    sudo_freepwcache();
    sudo_freegrcache();

    /* Clear globals */
    list_pw = NULL;
    saved_argv = NULL;
    NewArgv = NULL;
    NewArgc = 0;
    prev_user = NULL;

    debug_return;
}

static bool
tty_present(void)
{
    debug_decl(tty_present, SUDOERS_DEBUG_PLUGIN);
    
    if (user_tcpgid == 0 && user_ttypath == NULL) {
	/* No job control or terminal, check /dev/tty. */
	int fd = open(_PATH_TTY, O_RDWR);
	if (fd == -1)
	    debug_return_bool(false);
	close(fd);
    }
    debug_return_bool(true);
}

/*
 * Free memory allocated for struct sudo_user.
 */
void
sudo_user_free(void)
{
    debug_decl(sudo_user_free, SUDOERS_DEBUG_PLUGIN);

    /* Free remaining references to password and group entries. */
    if (sudo_user.pw != NULL)
	sudo_pw_delref(sudo_user.pw);
    if (runas_pw != NULL)
	sudo_pw_delref(runas_pw);
    if (runas_gr != NULL)
	sudo_gr_delref(runas_gr);
    if (user_gid_list != NULL)
	sudo_gidlist_delref(user_gid_list);

    /* Free dynamic contents of sudo_user. */
    free(user_cwd);
    free(user_name);
    free(user_gids);
    if (user_ttypath != NULL)
	free(user_ttypath);
    else
	free(user_tty);
    if (user_shost != user_host)
	    free(user_shost);
    free(user_host);
    if (user_srunhost != user_runhost)
	    free(user_srunhost);
    free(user_runhost);
    free(user_cmnd);
    free(user_args);
    free(list_cmnd);
    free(safe_cmnd);
    free(saved_cmnd);
    free(user_stat);
#ifdef HAVE_SELINUX
    free(user_role);
    free(user_type);
#endif
#ifdef HAVE_APPARMOR
    free(user_apparmor_profile);
#endif
#ifdef HAVE_PRIV_SET
    free(runas_privs);
    free(runas_limitprivs);
#endif
    memset(&sudo_user, 0, sizeof(sudo_user));

    debug_return;
}