summaryrefslogtreecommitdiffstats
path: root/usr.sbin/pw/pw_user.c
blob: c9d2b4082558b2dc6b44976033ce340f0ed0448f (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
/*-
 * Copyright (C) 1996
 *	David L. Nugent.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 */

#ifndef lint
static const char rcsid[] =
  "$FreeBSD$";
#endif /* not lint */

#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <sys/param.h>
#include <dirent.h>
#include <paths.h>
#include <termios.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>
#include <utmp.h>
#if defined(USE_MD5RAND)
#include <md5.h>
#endif
#include "pw.h"
#include "bitmap.h"

#if (MAXLOGNAME-1) > UT_NAMESIZE
#define LOGNAMESIZE UT_NAMESIZE
#else
#define LOGNAMESIZE (MAXLOGNAME-1)
#endif

static          int randinit;
static		char locked_str[] = "*LOCKED*";

static int      print_user(struct passwd * pwd, int pretty, int v7);
static uid_t    pw_uidpolicy(struct userconf * cnf, struct cargs * args);
static uid_t    pw_gidpolicy(struct userconf * cnf, struct cargs * args, char *nam, gid_t prefer);
static time_t   pw_pwdpolicy(struct userconf * cnf, struct cargs * args);
static time_t   pw_exppolicy(struct userconf * cnf, struct cargs * args);
static char    *pw_homepolicy(struct userconf * cnf, struct cargs * args, char const * user);
static char    *pw_shellpolicy(struct userconf * cnf, struct cargs * args, char *newshell);
static char    *pw_password(struct userconf * cnf, struct cargs * args, char const * user);
static char    *shell_path(char const * path, char *shells[], char *sh);
static void     rmat(uid_t uid);
static void	rmskey(char const * name);

/*-
 * -C config      configuration file
 * -q             quiet operation
 * -n name        login name
 * -u uid         user id
 * -c comment     user name/comment
 * -d directory   home directory
 * -e date        account expiry date
 * -p date        password expiry date
 * -g grp         primary group
 * -G grp1,grp2   additional groups
 * -m [ -k dir ]  create and set up home
 * -s shell       name of login shell
 * -o             duplicate uid ok
 * -L class       user class
 * -l name        new login name
 * -h fd          password filehandle
 * -F             force print or add
 *   Setting defaults:
 * -D             set user defaults
 * -b dir         default home root dir
 * -e period      default expiry period
 * -p period      default password change period
 * -g group       default group
 * -G             grp1,grp2.. default additional groups
 * -L class       default login class
 * -k dir         default home skeleton
 * -s shell       default shell
 * -w method      default password method
 */

int
pw_user(struct userconf * cnf, int mode, struct cargs * args)
{
	int	        rc;
	char           *p = NULL;
	char					 *passtmp;
	struct carg    *a_name;
	struct carg    *a_uid;
	struct carg    *arg;
	struct passwd  *pwd = NULL;
	struct group   *grp;
	struct stat     st;
	char            line[_PASSWORD_LEN+1];

	static struct passwd fakeuser =
	{
		NULL,
		"*",
		-1,
		-1,
		0,
		"",
		"User &",
		"/bin/sh",
		0,
		0,
		0
	};


	/*
	 * With M_NEXT, we only need to return the
	 * next uid to stdout
	 */
	if (mode == M_NEXT)
	{
		uid_t next = pw_uidpolicy(cnf, args);
		if (getarg(args, 'q'))
			return next;
		printf("%ld:", (long)next);
		pw_group(cnf, mode, args);
		return EXIT_SUCCESS;
	}

	/*
	 * We can do all of the common legwork here
	 */

	if ((arg = getarg(args, 'b')) != NULL) {
		cnf->home = arg->val;
	}

	/*
	 * If we'll need to use it or we're updating it,
	 * then create the base home directory if necessary
	 */
	if (arg != NULL || getarg(args, 'm') != NULL) {
		int	l = strlen(cnf->home);

		if (l > 1 && cnf->home[l-1] == '/')	/* Shave off any trailing path delimiter */
			cnf->home[--l] = '\0';

		if (l < 2 || *cnf->home != '/')		/* Check for absolute path name */
			errx(EX_DATAERR, "invalid base directory for home '%s'", cnf->home);

		if (stat(cnf->home, &st) == -1) {
			char	dbuf[MAXPATHLEN];

			/*
			 * This is a kludge especially for Joerg :)
			 * If the home directory would be created in the root partition, then
			 * we really create it under /usr which is likely to have more space.
			 * But we create a symlink from cnf->home -> "/usr" -> cnf->home
			 */
			if (strchr(cnf->home+1, '/') == NULL) {
				strcpy(dbuf, "/usr");
				strncat(dbuf, cnf->home, MAXPATHLEN-5);
				if (mkdir(dbuf, 0755) != -1 || errno == EEXIST) {
					chown(dbuf, 0, 0);
					symlink(dbuf, cnf->home);
				}
				/* If this falls, fall back to old method */
			}
			p = strncpy(dbuf, cnf->home, sizeof dbuf);
			dbuf[MAXPATHLEN-1] = '\0';
			if (stat(dbuf, &st) == -1) {
				while ((p = strchr(++p, '/')) != NULL) {
					*p = '\0';
					if (stat(dbuf, &st) == -1) {
						if (mkdir(dbuf, 0755) == -1)
							goto direrr;
						chown(dbuf, 0, 0);
					} else if (!S_ISDIR(st.st_mode))
						errx(EX_OSFILE, "'%s' (root home parent) is not a directory", dbuf);
					*p = '/';
				}
			}
			if (stat(dbuf, &st) == -1) {
				if (mkdir(dbuf, 0755) == -1) {
				direrr:	err(EX_OSFILE, "mkdir '%s'", dbuf);
				}
				chown(dbuf, 0, 0);
			}
		} else if (!S_ISDIR(st.st_mode))
			errx(EX_OSFILE, "root home `%s' is not a directory", cnf->home);
	}


	if ((arg = getarg(args, 'e')) != NULL)
		cnf->expire_days = atoi(arg->val);

	if ((arg = getarg(args, 'y')) != NULL)
		cnf->nispasswd = arg->val;

	if ((arg = getarg(args, 'p')) != NULL && arg->val)
		cnf->password_days = atoi(arg->val);

	if ((arg = getarg(args, 'g')) != NULL) {
		p = arg->val;
		if ((grp = GETGRNAM(p)) == NULL) {
			if (!isdigit(*p) || (grp = GETGRGID((gid_t) atoi(p))) == NULL)
				errx(EX_NOUSER, "group `%s' does not exist", p);
		}
		cnf->default_group = newstr(grp->gr_name);
	}
	if ((arg = getarg(args, 'L')) != NULL)
		cnf->default_class = pw_checkname((u_char *)arg->val, 0);

	if ((arg = getarg(args, 'G')) != NULL && arg->val) {
		int             i = 0;

		for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
			if ((grp = GETGRNAM(p)) == NULL) {
				if (!isdigit(*p) || (grp = GETGRGID((gid_t) atoi(p))) == NULL)
					errx(EX_NOUSER, "group `%s' does not exist", p);
			}
			if (extendarray(&cnf->groups, &cnf->numgroups, i + 2) != -1)
				cnf->groups[i++] = newstr(grp->gr_name);
		}
		while (i < cnf->numgroups)
			cnf->groups[i++] = NULL;
	}
	if ((arg = getarg(args, 'k')) != NULL) {
		if (stat(cnf->dotdir = arg->val, &st) == -1 || !S_ISDIR(st.st_mode))
			errx(EX_OSFILE, "skeleton `%s' is not a directory or does not exist", cnf->dotdir);
	}
	if ((arg = getarg(args, 's')) != NULL)
		cnf->shell_default = arg->val;

	if (mode == M_ADD && getarg(args, 'D')) {
		if (getarg(args, 'n') != NULL)
			errx(EX_DATAERR, "can't combine `-D' with `-n name'");
		if ((arg = getarg(args, 'u')) != NULL && (p = strtok(arg->val, ", \t")) != NULL) {
			if ((cnf->min_uid = (uid_t) atoi(p)) == 0)
				cnf->min_uid = 1000;
			if ((p = strtok(NULL, " ,\t")) == NULL || (cnf->max_uid = (uid_t) atoi(p)) < cnf->min_uid)
				cnf->max_uid = 32000;
		}
		if ((arg = getarg(args, 'i')) != NULL && (p = strtok(arg->val, ", \t")) != NULL) {
			if ((cnf->min_gid = (gid_t) atoi(p)) == 0)
				cnf->min_gid = 1000;
			if ((p = strtok(NULL, " ,\t")) == NULL || (cnf->max_gid = (gid_t) atoi(p)) < cnf->min_gid)
				cnf->max_gid = 32000;
		}
		if ((arg = getarg(args, 'w')) != NULL)
			cnf->default_password = boolean_val(arg->val, cnf->default_password);

		arg = getarg(args, 'C');
		if (write_userconfig(arg ? arg->val : NULL))
			return EXIT_SUCCESS;
		warn("config update");
		return EX_IOERR;
	}
	if (mode == M_PRINT && getarg(args, 'a')) {
		int             pretty = getarg(args, 'P') != NULL;
		int		v7 = getarg(args, '7') != NULL;

		SETPWENT();
		while ((pwd = GETPWENT()) != NULL)
			print_user(pwd, pretty, v7);
		ENDPWENT();
		return EXIT_SUCCESS;
	}
	if ((a_name = getarg(args, 'n')) != NULL)
		pwd = GETPWNAM(pw_checkname((u_char *)a_name->val, 0));
	a_uid = getarg(args, 'u');

	if (a_uid == NULL) {
		if (a_name == NULL)
			errx(EX_DATAERR, "user name or id required");

		/*
		 * Determine whether 'n' switch is name or uid - we don't
		 * really don't really care which we have, but we need to
		 * know.
		 */
		if (mode != M_ADD && pwd == NULL
		    && strspn(a_name->val, "0123456789") == strlen(a_name->val)
		    && atoi(a_name->val) > 0) {	/* Assume uid */
			(a_uid = a_name)->ch = 'u';
			a_name = NULL;
		}
	}
	/*
	 * Update, delete & print require that the user exists
	 */
	if (mode == M_UPDATE || mode == M_DELETE ||
	    mode == M_PRINT  || mode == M_LOCK   || mode == M_UNLOCK) {
		if (a_name == NULL && pwd == NULL)	/* Try harder */
			pwd = GETPWUID(atoi(a_uid->val));

		if (pwd == NULL) {
			if (mode == M_PRINT && getarg(args, 'F')) {
				fakeuser.pw_name = a_name ? a_name->val : "nouser";
				fakeuser.pw_uid = a_uid ? (uid_t) atol(a_uid->val) : -1;
				return print_user(&fakeuser,
						  getarg(args, 'P') != NULL,
						  getarg(args, '7') != NULL);
			}
			if (a_name == NULL)
				errx(EX_NOUSER, "no such uid `%s'", a_uid->val);
			errx(EX_NOUSER, "no such user `%s'", a_name->val);
		}
		if (a_name == NULL)	/* May be needed later */
			a_name = addarg(args, 'n', newstr(pwd->pw_name));

		/*
		 * The M_LOCK and M_UNLOCK functions simply add or remove
		 * a "*LOCKED*" prefix from in front of the password to
		 * prevent it decoding correctly, and therefore prevents
		 * access. Of course, this only prevents access via
		 * password authentication (not ssh, kerberos or any
		 * other method that does not use the UNIX password) but
		 * that is a known limitation.
		 */

		if (mode == M_LOCK) {
			if (strncmp(pwd->pw_passwd, locked_str, sizeof(locked_str)-1) == 0)
				errx(EX_DATAERR, "user '%s' is already locked", pwd->pw_name);
			passtmp = malloc(strlen(pwd->pw_passwd) + sizeof(locked_str));
			if (passtmp == NULL)	/* disaster */
				errx(EX_UNAVAILABLE, "out of memory");
			strcpy(passtmp, locked_str);
			strcat(passtmp, pwd->pw_passwd);
			pwd->pw_passwd = passtmp;
		} else if (mode == M_UNLOCK) {
			if (strncmp(pwd->pw_passwd, locked_str, sizeof(locked_str)-1) != 0)
				errx(EX_DATAERR, "user '%s' is not locked", pwd->pw_name);
			pwd->pw_passwd += sizeof(locked_str)-1;
		}

		/*
		 * Handle deletions now
		 */
		if (mode == M_DELETE) {
			char            file[MAXPATHLEN];
			char            home[MAXPATHLEN];
			uid_t           uid = pwd->pw_uid;

			if (strcmp(pwd->pw_name, "root") == 0)
				errx(EX_DATAERR, "cannot remove user 'root'");

			if (!PWALTDIR()) {
				/*
				 * Remove skey record from /etc/skeykeys
		        	 */

				rmskey(pwd->pw_name);

				/*
				 * Remove crontabs
				 */
				sprintf(file, "/var/cron/tabs/%s", pwd->pw_name);
				if (access(file, F_OK) == 0) {
					sprintf(file, "crontab -u %s -r", pwd->pw_name);
					system(file);
				}
			}
			/*
			 * Save these for later, since contents of pwd may be
			 * invalidated by deletion
			 */
			sprintf(file, "%s/%s", _PATH_MAILDIR, pwd->pw_name);
			strncpy(home, pwd->pw_dir, sizeof home);
			home[sizeof home - 1] = '\0';

			rc = delpwent(pwd);
			if (rc == -1)
				err(EX_IOERR, "user '%s' does not exist", pwd->pw_name);
			else if (rc != 0) {
				warnc(rc, "passwd update");
				return EX_IOERR;
			}

			if (cnf->nispasswd && *cnf->nispasswd=='/') {
				rc = delnispwent(cnf->nispasswd, a_name->val);
				if (rc == -1)
					warnx("WARNING: user '%s' does not exist in NIS passwd", pwd->pw_name);
				else if (rc != 0)
					warnc(rc, "WARNING: NIS passwd update");
				/* non-fatal */
			}

			editgroups(a_name->val, NULL);

			pw_log(cnf, mode, W_USER, "%s(%ld) account removed", a_name->val, (long) uid);

			if (!PWALTDIR()) {
				/*
				 * Remove mail file
				 */
				remove(file);

				/*
				 * Remove at jobs
				 */
				if (getpwuid(uid) == NULL)
					rmat(uid);

				/*
				 * Remove home directory and contents
				 */
				if (getarg(args, 'r') != NULL && *home == '/' && getpwuid(uid) == NULL) {
					if (stat(home, &st) != -1) {
						rm_r(home, uid);
						pw_log(cnf, mode, W_USER, "%s(%ld) home '%s' %sremoved",
						       a_name->val, (long) uid, home,
						       stat(home, &st) == -1 ? "" : "not completely ");
					}
				}
			}
			return EXIT_SUCCESS;
		} else if (mode == M_PRINT)
			return print_user(pwd,
					  getarg(args, 'P') != NULL,
					  getarg(args, '7') != NULL);

		/*
		 * The rest is edit code
		 */
		if ((arg = getarg(args, 'l')) != NULL) {
			if (strcmp(pwd->pw_name, "root") == 0)
				errx(EX_DATAERR, "can't rename `root' account");
			pwd->pw_name = pw_checkname((u_char *)arg->val, 0);
		}
		if ((arg = getarg(args, 'u')) != NULL && isdigit(*arg->val)) {
			pwd->pw_uid = (uid_t) atol(arg->val);
			if (pwd->pw_uid != 0 && strcmp(pwd->pw_name, "root") == 0)
				errx(EX_DATAERR, "can't change uid of `root' account");
			if (pwd->pw_uid == 0 && strcmp(pwd->pw_name, "root") != 0)
				warnx("WARNING: account `%s' will have a uid of 0 (superuser access!)", pwd->pw_name);
		}
		if ((arg = getarg(args, 'g')) != NULL && pwd->pw_uid != 0)	/* Already checked this */
			pwd->pw_gid = (gid_t) GETGRNAM(cnf->default_group)->gr_gid;

		if ((arg = getarg(args, 'p')) != NULL) {
			if (*arg->val == '\0' || strcmp(arg->val, "0") == 0)
				pwd->pw_change = 0;
			else {
				time_t          now = time(NULL);
				time_t          expire = parse_date(now, arg->val);

				if (now == expire)
					errx(EX_DATAERR, "invalid password change date `%s'", arg->val);
				pwd->pw_change = expire;
			}
		}
		if ((arg = getarg(args, 'e')) != NULL) {
			if (*arg->val == '\0' || strcmp(arg->val, "0") == 0)
				pwd->pw_expire = 0;
			else {
				time_t          now = time(NULL);
				time_t          expire = parse_date(now, arg->val);

				if (now == expire)
					errx(EX_DATAERR, "invalid account expiry date `%s'", arg->val);
				pwd->pw_expire = expire;
			}
		}
		if ((arg = getarg(args, 's')) != NULL)
			pwd->pw_shell = shell_path(cnf->shelldir, cnf->shells, arg->val);

		if (getarg(args, 'L'))
			pwd->pw_class = cnf->default_class;

		if ((arg  = getarg(args, 'd')) != NULL) {
			if (stat(pwd->pw_dir = arg->val, &st) == -1) {
				if (getarg(args, 'm') == NULL && strcmp(pwd->pw_dir, "/nonexistent") != 0)
				  warnx("WARNING: home `%s' does not exist", pwd->pw_dir);
			} else if (!S_ISDIR(st.st_mode))
				warnx("WARNING: home `%s' is not a directory", pwd->pw_dir);
		}

		if ((arg = getarg(args, 'w')) != NULL && getarg(args, 'h') == NULL)
			pwd->pw_passwd = pw_password(cnf, args, pwd->pw_name);

	} else {
		if (a_name == NULL)	/* Required */
			errx(EX_DATAERR, "login name required");
		else if ((pwd = GETPWNAM(a_name->val)) != NULL)	/* Exists */
			errx(EX_DATAERR, "login name `%s' already exists", a_name->val);

		/*
		 * Now, set up defaults for a new user
		 */
		pwd = &fakeuser;
		pwd->pw_name = a_name->val;
		pwd->pw_class = cnf->default_class ? cnf->default_class : "";
		pwd->pw_passwd = pw_password(cnf, args, pwd->pw_name);
		pwd->pw_uid = pw_uidpolicy(cnf, args);
		pwd->pw_gid = pw_gidpolicy(cnf, args, pwd->pw_name, (gid_t) pwd->pw_uid);
		pwd->pw_change = pw_pwdpolicy(cnf, args);
		pwd->pw_expire = pw_exppolicy(cnf, args);
		pwd->pw_dir = pw_homepolicy(cnf, args, pwd->pw_name);
		pwd->pw_shell = pw_shellpolicy(cnf, args, NULL);

		if (pwd->pw_uid == 0 && strcmp(pwd->pw_name, "root") != 0)
			warnx("WARNING: new account `%s' has a uid of 0 (superuser access!)", pwd->pw_name);
	}

	/*
	 * Shared add/edit code
	 */
	if ((arg = getarg(args, 'c')) != NULL)
		pwd->pw_gecos = pw_checkname((u_char *)arg->val, 1);

	if ((arg = getarg(args, 'h')) != NULL) {
		if (strcmp(arg->val, "-") == 0)
			pwd->pw_passwd = "*";	/* No access */
		else {
			int             fd = atoi(arg->val);
			int             b;
			int             istty = isatty(fd);
			struct termios  t;

			if (istty) {
				if (tcgetattr(fd, &t) == -1)
					istty = 0;
				else {
					struct termios  n = t;

					/* Disable echo */
					n.c_lflag &= ~(ECHO);
					tcsetattr(fd, TCSANOW, &n);
					printf("%sassword for user %s:", (mode == M_UPDATE) ? "New p" : "P", pwd->pw_name);
					fflush(stdout);
				}
			}
			b = read(fd, line, sizeof(line) - 1);
			if (istty) {	/* Restore state */
				tcsetattr(fd, TCSANOW, &t);
				fputc('\n', stdout);
				fflush(stdout);
			}
			if (b < 0) {
				warn("-h file descriptor");
				return EX_IOERR;
			}
			line[b] = '\0';
			if ((p = strpbrk(line, " \t\r\n")) != NULL)
				*p = '\0';
			if (!*line)
				errx(EX_DATAERR, "empty password read on file descriptor %d", fd);
			pwd->pw_passwd = pw_pwcrypt(line);
		}
	}

	/*
	 * Special case: -N only displays & exits
	 */
	if (getarg(args, 'N') != NULL)
		return print_user(pwd,
				  getarg(args, 'P') != NULL,
				  getarg(args, '7') != NULL);

	if (mode == M_ADD) {
		rc = addpwent(pwd);
		if (rc == -1) {
			warnx("user '%s' already exists", pwd->pw_name);
			return EX_IOERR;
		} else if (rc != 0) {
			warnc(rc, "passwd file update");
			return EX_IOERR;
		}
		if (cnf->nispasswd && *cnf->nispasswd=='/') {
			rc = addnispwent(cnf->nispasswd, pwd);
			if (rc == -1)
				warnx("User '%s' already exists in NIS passwd", pwd->pw_name);
			else
				warnc(rc, "NIS passwd update");
			/* NOTE: we treat NIS-only update errors as non-fatal */
		}
	} else if (mode == M_UPDATE || mode == M_LOCK || mode == M_UNLOCK) {
		rc = chgpwent(a_name->val, pwd);
		if (rc == -1) {
			warnx("user '%s' does not exist (NIS?)", pwd->pw_name);
			return EX_IOERR;
		} else if (rc != 0) {
			warnc(rc, "passwd file update");
			return EX_IOERR;
		}
		if ( cnf->nispasswd && *cnf->nispasswd=='/') {
			rc = chgnispwent(cnf->nispasswd, a_name->val, pwd);
			if (rc == -1)
				warn("User '%s' not found in NIS passwd", pwd->pw_name);
			else
				warnc(rc, "NIS passwd update");
			/* NOTE: NIS-only update errors are not fatal */
		}
	}

	/*
	 * Ok, user is created or changed - now edit group file
	 */

	if (mode == M_ADD || getarg(args, 'G') != NULL)
		editgroups(pwd->pw_name, cnf->groups);

	/* pwd may have been invalidated */
	if ((pwd = GETPWNAM(a_name->val)) == NULL)
		errx(EX_NOUSER, "user '%s' disappeared during update", a_name->val);

	grp = GETGRGID(pwd->pw_gid);
	pw_log(cnf, mode, W_USER, "%s(%ld):%s(%d):%s:%s:%s",
	       pwd->pw_name, (long) pwd->pw_uid,
	    grp ? grp->gr_name : "unknown", (long) (grp ? grp->gr_gid : -1),
	       pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell);

	/*
	 * If adding, let's touch and chown the user's mail file. This is not
	 * strictly necessary under BSD with a 0755 maildir but it also
	 * doesn't hurt anything to create the empty mailfile
	 */
	if (mode == M_ADD) {
		FILE           *fp;

		if (!PWALTDIR()) {
			sprintf(line, "%s/%s", _PATH_MAILDIR, pwd->pw_name);
			close(open(line, O_RDWR | O_CREAT, 0600));	/* Preserve contents &
									 * mtime */
			chown(line, pwd->pw_uid, pwd->pw_gid);

			/*
			 * Send mail to the new user as well, if we are asked to
			 */
			if (cnf->newmail && *cnf->newmail && (fp = fopen(cnf->newmail, "r")) != NULL) {
				FILE           *pfp = popen(_PATH_SENDMAIL " -t", "w");

				if (pfp == NULL)
					warn("sendmail");
				else {
					fprintf(pfp, "From: root\n" "To: %s\n" "Subject: Welcome!\n\n", pwd->pw_name);
					while (fgets(line, sizeof(line), fp) != NULL) {
						/* Do substitutions? */
						fputs(line, pfp);
					}
					pclose(pfp);
					pw_log(cnf, mode, W_USER, "%s(%ld) new user mail sent",
					       pwd->pw_name, (long) pwd->pw_uid);
				}
				fclose(fp);
			}
		}
	}
	/*
	 * Finally, let's create and populate the user's home directory. Note
	 * that this also `works' for editing users if -m is used, but
	 * existing files will *not* be overwritten.
	 */
	if (!PWALTDIR() && getarg(args, 'm') != NULL && pwd->pw_dir && *pwd->pw_dir == '/' && pwd->pw_dir[1]) {
		copymkdir(pwd->pw_dir, cnf->dotdir, 0755, pwd->pw_uid, pwd->pw_gid);
		pw_log(cnf, mode, W_USER, "%s(%ld) home %s made",
		       pwd->pw_name, (long) pwd->pw_uid, pwd->pw_dir);
	}
	return EXIT_SUCCESS;
}


static          uid_t
pw_uidpolicy(struct userconf * cnf, struct cargs * args)
{
	struct passwd  *pwd;
	uid_t           uid = (uid_t) - 1;
	struct carg    *a_uid = getarg(args, 'u');

	/*
	 * Check the given uid, if any
	 */
	if (a_uid != NULL) {
		uid = (uid_t) atol(a_uid->val);

		if ((pwd = GETPWUID(uid)) != NULL && getarg(args, 'o') == NULL)
			errx(EX_DATAERR, "uid `%ld' has already been allocated", (long) pwd->pw_uid);
	} else {
		struct bitmap   bm;

		/*
		 * We need to allocate the next available uid under one of
		 * two policies a) Grab the first unused uid b) Grab the
		 * highest possible unused uid
		 */
		if (cnf->min_uid >= cnf->max_uid) {	/* Sanity
							 * claus^H^H^H^Hheck */
			cnf->min_uid = 1000;
			cnf->max_uid = 32000;
		}
		bm = bm_alloc(cnf->max_uid - cnf->min_uid + 1);

		/*
		 * Now, let's fill the bitmap from the password file
		 */
		SETPWENT();
		while ((pwd = GETPWENT()) != NULL)
			if (pwd->pw_uid >= (uid_t) cnf->min_uid && pwd->pw_uid <= (uid_t) cnf->max_uid)
				bm_setbit(&bm, pwd->pw_uid - cnf->min_uid);
		ENDPWENT();

		/*
		 * Then apply the policy, with fallback to reuse if necessary
		 */
		if (cnf->reuse_uids || (uid = (uid_t) (bm_lastset(&bm) + cnf->min_uid + 1)) > cnf->max_uid)
			uid = (uid_t) (bm_firstunset(&bm) + cnf->min_uid);

		/*
		 * Another sanity check
		 */
		if (uid < cnf->min_uid || uid > cnf->max_uid)
			errx(EX_SOFTWARE, "unable to allocate a new uid - range fully used");
		bm_dealloc(&bm);
	}
	return uid;
}


static          uid_t
pw_gidpolicy(struct userconf * cnf, struct cargs * args, char *nam, gid_t prefer)
{
	struct group   *grp;
	gid_t           gid = (uid_t) - 1;
	struct carg    *a_gid = getarg(args, 'g');

	/*
	 * If no arg given, see if default can help out
	 */
	if (a_gid == NULL && cnf->default_group && *cnf->default_group)
		a_gid = addarg(args, 'g', cnf->default_group);

	/*
	 * Check the given gid, if any
	 */
	SETGRENT();
	if (a_gid != NULL) {
		if ((grp = GETGRNAM(a_gid->val)) == NULL) {
			gid = (gid_t) atol(a_gid->val);
			if ((gid == 0 && !isdigit(*a_gid->val)) || (grp = GETGRGID(gid)) == NULL)
				errx(EX_NOUSER, "group `%s' is not defined", a_gid->val);
		}
		gid = grp->gr_gid;
	} else if ((grp = GETGRNAM(nam)) != NULL && grp->gr_mem[0] == NULL) {
		gid = grp->gr_gid;  /* Already created? Use it anyway... */
	} else {
		struct cargs    grpargs;
		char            tmp[32];

		LIST_INIT(&grpargs);
		addarg(&grpargs, 'n', nam);

		/*
		 * We need to auto-create a group with the user's name. We
		 * can send all the appropriate output to our sister routine
		 * bit first see if we can create a group with gid==uid so we
		 * can keep the user and group ids in sync. We purposely do
		 * NOT check the gid range if we can force the sync. If the
		 * user's name dups an existing group, then the group add
		 * function will happily handle that case for us and exit.
		 */
		if (GETGRGID(prefer) == NULL) {
			sprintf(tmp, "%lu", (unsigned long) prefer);
			addarg(&grpargs, 'g', tmp);
		}
		if (getarg(args, 'N'))
		{
			addarg(&grpargs, 'N', NULL);
			addarg(&grpargs, 'q', NULL);
			gid = pw_group(cnf, M_NEXT, &grpargs);
		}
		else
		{
			pw_group(cnf, M_ADD, &grpargs);
			if ((grp = GETGRNAM(nam)) != NULL)
				gid = grp->gr_gid;
		}
		a_gid = grpargs.lh_first;
		while (a_gid != NULL) {
			struct carg    *t = a_gid->list.le_next;
			LIST_REMOVE(a_gid, list);
			a_gid = t;
		}
	}
	ENDGRENT();
	return gid;
}


static          time_t
pw_pwdpolicy(struct userconf * cnf, struct cargs * args)
{
	time_t          result = 0;
	time_t          now = time(NULL);
	struct carg    *arg = getarg(args, 'p');

	if (arg != NULL) {
		if ((result = parse_date(now, arg->val)) == now)
			errx(EX_DATAERR, "invalid date/time `%s'", arg->val);
	} else if (cnf->password_days > 0)
		result = now + ((long) cnf->password_days * 86400L);
	return result;
}


static          time_t
pw_exppolicy(struct userconf * cnf, struct cargs * args)
{
	time_t          result = 0;
	time_t          now = time(NULL);
	struct carg    *arg = getarg(args, 'e');

	if (arg != NULL) {
		if ((result = parse_date(now, arg->val)) == now)
			errx(EX_DATAERR, "invalid date/time `%s'", arg->val);
	} else if (cnf->expire_days > 0)
		result = now + ((long) cnf->expire_days * 86400L);
	return result;
}


static char    *
pw_homepolicy(struct userconf * cnf, struct cargs * args, char const * user)
{
	struct carg    *arg = getarg(args, 'd');

	if (arg)
		return arg->val;
	else {
		static char     home[128];

		if (cnf->home == NULL || *cnf->home == '\0')
			errx(EX_CONFIG, "no base home directory set");
		sprintf(home, "%s/%s", cnf->home, user);
		return home;
	}
}

static char    *
shell_path(char const * path, char *shells[], char *sh)
{
	if (sh != NULL && (*sh == '/' || *sh == '\0'))
		return sh;	/* specified full path or forced none */
	else {
		char           *p;
		char            paths[_UC_MAXLINE];

		/*
		 * We need to search paths
		 */
		strncpy(paths, path, sizeof paths);
		paths[sizeof paths - 1] = '\0';
		for (p = strtok(paths, ": \t\r\n"); p != NULL; p = strtok(NULL, ": \t\r\n")) {
			int             i;
			static char     shellpath[256];

			if (sh != NULL) {
				sprintf(shellpath, "%s/%s", p, sh);
				if (access(shellpath, X_OK) == 0)
					return shellpath;
			} else
				for (i = 0; i < _UC_MAXSHELLS && shells[i] != NULL; i++) {
					sprintf(shellpath, "%s/%s", p, shells[i]);
					if (access(shellpath, X_OK) == 0)
						return shellpath;
				}
		}
		if (sh == NULL)
			errx(EX_OSFILE, "can't find shell `%s' in shell paths", sh);
		errx(EX_CONFIG, "no default shell available or defined");
		return NULL;
	}
}


static char    *
pw_shellpolicy(struct userconf * cnf, struct cargs * args, char *newshell)
{
	char           *sh = newshell;
	struct carg    *arg = getarg(args, 's');

	if (newshell == NULL && arg != NULL)
		sh = arg->val;
	return shell_path(cnf->shelldir, cnf->shells, sh ? sh : cnf->shell_default);
}

static char const chars[] = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ.";

char           *
pw_pwcrypt(char *password)
{
	int             i;
	char            salt[12];

	static char     buf[256];

	/*
	 * Calculate a salt value
	 */
	if (!randinit) {
		randinit = 1;
#ifdef __FreeBSD__
		srandomdev();
#else
		srandom((unsigned long) (time(NULL) ^ getpid()));
#endif
	}
	for (i = 0; i < 8; i++)
		salt[i] = chars[random() % 63];
	salt[i] = '\0';

	return strcpy(buf, crypt(password, salt));
}

#if defined(USE_MD5RAND)
u_char *
pw_getrand(u_char *buf, int len)	/* cryptographically secure rng */
{
	int i;
	for (i=0;i<len;i+=16) {
		u_char ubuf[16];

		MD5_CTX md5_ctx;
		struct timeval tv, tvo;
		struct rusage ru;
		int n=0;
		int t;

		MD5Init (&md5_ctx);
		t=getpid();
		MD5Update (&md5_ctx, (u_char*)&t, sizeof t);
		t=getppid();
		MD5Update (&md5_ctx, (u_char*)&t, sizeof t);
		gettimeofday (&tvo, NULL);
		do {
			getrusage (RUSAGE_SELF, &ru);
			MD5Update (&md5_ctx, (u_char*)&ru, sizeof ru);
			gettimeofday (&tv, NULL);
			MD5Update (&md5_ctx, (u_char*)&tv, sizeof tv);
		} while (n++<20 || tv.tv_usec-tvo.tv_usec<100*1000);
		MD5Final (ubuf, &md5_ctx);
		memcpy(buf+i, ubuf, MIN(16, len-n));
	}
	return buf;
}

#else	/* Portable version */

static u_char *
pw_getrand(u_char *buf, int len)
{
	int i;

	for (i = 0; i < len; i++) {
		unsigned long val = random();
		/* Use all bits in the random value */
		buf[i]=(u_char)((val >> 24) ^ (val >> 16) ^ (val >> 8) ^ val);
	}
	return buf;
}

#endif

static char    *
pw_password(struct userconf * cnf, struct cargs * args, char const * user)
{
	int             i, l;
	char            pwbuf[32];
	u_char		rndbuf[sizeof pwbuf];

	switch (cnf->default_password) {
	case -1:		/* Random password */
		if (!randinit) {
			randinit = 1;
#ifdef __FreeBSD__
			srandomdev();
#else
			srandom((unsigned long) (time(NULL) ^ getpid()));
#endif
		}
		l = (random() % 8 + 8);	/* 8 - 16 chars */
		pw_getrand(rndbuf, l);
		for (i = 0; i < l; i++)
			pwbuf[i] = chars[rndbuf[i] % (sizeof(chars)-1)];
		pwbuf[i] = '\0';

		/*
		 * We give this information back to the user
		 */
		if (getarg(args, 'h') == NULL && getarg(args, 'N') == NULL) {
			if (isatty(1))
				printf("Password for '%s' is: ", user);
			printf("%s\n", pwbuf);
			fflush(stdout);
		}
		break;

	case -2:		/* No password at all! */
		return "";

	case 0:		/* No login - default */
	default:
		return "*";

	case 1:		/* user's name */
		strncpy(pwbuf, user, sizeof pwbuf);
		pwbuf[sizeof pwbuf - 1] = '\0';
		break;
	}
	return pw_pwcrypt(pwbuf);
}


static int
print_user(struct passwd * pwd, int pretty, int v7)
{
	if (!pretty) {
		char            buf[_UC_MAXLINE];

		fmtpwentry(buf, pwd, v7 ? PWF_PASSWD : PWF_STANDARD);
		fputs(buf, stdout);
	} else {
		int		j;
		char           *p;
		struct group   *grp = GETGRGID(pwd->pw_gid);
		char            uname[60] = "User &", office[60] = "[None]",
		                wphone[60] = "[None]", hphone[60] = "[None]";
		char		acexpire[32] = "[None]", pwexpire[32] = "[None]";
		struct tm *    tptr;

		if ((p = strtok(pwd->pw_gecos, ",")) != NULL) {
			strncpy(uname, p, sizeof uname);
			uname[sizeof uname - 1] = '\0';
			if ((p = strtok(NULL, ",")) != NULL) {
				strncpy(office, p, sizeof office);
				office[sizeof office - 1] = '\0';
				if ((p = strtok(NULL, ",")) != NULL) {
					strncpy(wphone, p, sizeof wphone);
					wphone[sizeof wphone - 1] = '\0';
					if ((p = strtok(NULL, "")) != NULL) {
						strncpy(hphone, p, sizeof hphone);
						hphone[sizeof hphone - 1] = '\0';
					}
				}
			}
		}
		/*
		 * Handle '&' in gecos field
		 */
		if ((p = strchr(uname, '&')) != NULL) {
			int             l = strlen(pwd->pw_name);
			int             m = strlen(p);

			memmove(p + l, p + 1, m);
			memmove(p, pwd->pw_name, l);
			*p = (char) toupper(*p);
		}
		if (pwd->pw_expire > (time_t)0 && (tptr = localtime(&pwd->pw_expire)) != NULL)
		  strftime(acexpire, sizeof acexpire, "%c", tptr);
		if (pwd->pw_change > (time_t)9 && (tptr = localtime(&pwd->pw_change)) != NULL)
		  strftime(pwexpire, sizeof pwexpire, "%c", tptr);
		printf("Login Name: %-15s   #%-12ld Group: %-15s   #%ld\n"
		       " Full Name: %s\n"
		       "      Home: %-26.26s      Class: %s\n"
		       "     Shell: %-26.26s     Office: %s\n"
		       "Work Phone: %-26.26s Home Phone: %s\n"
		       "Acc Expire: %-26.26s Pwd Expire: %s\n",
		       pwd->pw_name, (long) pwd->pw_uid,
		       grp ? grp->gr_name : "(invalid)", (long) pwd->pw_gid,
		       uname, pwd->pw_dir, pwd->pw_class,
		       pwd->pw_shell, office, wphone, hphone,
		       acexpire, pwexpire);
	        SETGRENT();
		j = 0;
		while ((grp=GETGRENT()) != NULL)
		{
			int     i = 0;
			while (grp->gr_mem[i] != NULL)
			{
				if (strcmp(grp->gr_mem[i], pwd->pw_name)==0)
				{
					printf(j++ == 0 ? "    Groups: %s" : ",%s", grp->gr_name);
					break;
				}
				++i;
			}
		}
		ENDGRENT();
		printf("%s\n", j ? "\n" : "");
	}
	return EXIT_SUCCESS;
}

char    *
pw_checkname(u_char *name, int gecos)
{
	int             l = 0;
	char const     *notch = gecos ? ":!@" : " ,\t:+&#%$^()!@~*?<>=|\\/\"";

	while (name[l]) {
		if (strchr(notch, name[l]) != NULL || name[l] < ' ' || name[l] == 127 ||
			(!gecos && l==0 && name[l] == '-') ||	/* leading '-' */
			(!gecos && name[l] & 0x80))	/* 8-bit */
			errx(EX_DATAERR, (name[l] >= ' ' && name[l] < 127)
					    ? "invalid character `%c' in field"
					    : "invalid character 0x%02x in field",
					    name[l]);
		++l;
	}
	if (!gecos && l > LOGNAMESIZE)
		errx(EX_DATAERR, "name too long `%s'", name);
	return (char *)name;
}


static void
rmat(uid_t uid)
{
	DIR            *d = opendir("/var/at/jobs");

	if (d != NULL) {
		struct dirent  *e;

		while ((e = readdir(d)) != NULL) {
			struct stat     st;

			if (strncmp(e->d_name, ".lock", 5) != 0 &&
			    stat(e->d_name, &st) == 0 &&
			    !S_ISDIR(st.st_mode) &&
			    st.st_uid == uid) {
				char            tmp[MAXPATHLEN];

				sprintf(tmp, "/usr/bin/atrm %s", e->d_name);
				system(tmp);
			}
		}
		closedir(d);
	}
}

static void
rmskey(char const * name)
{
	static const char etcskey[] = "/etc/skeykeys";
	FILE   *fp = fopen(etcskey, "r+");

	if (fp != NULL) {
		char	tmp[1024];
		off_t	atofs = 0;
		int	length = strlen(name);

		while (fgets(tmp, sizeof tmp, fp) != NULL) {
			if (strncmp(name, tmp, length) == 0 && tmp[length]==' ') {
				if (fseek(fp, atofs, SEEK_SET) == 0) {
					fwrite("#", 1, 1, fp);	/* Comment username out */
				}
				break;
			}
			atofs = ftell(fp);
		}
		/*
		 * If we got an error of any sort, don't update!
		 */
		fclose(fp);
	}
}

OpenPOWER on IntegriCloud