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sysusers: Move sync_rights and rename_and_apply_smack to basic
[thirdparty/systemd.git] / src / sysusers / sysusers.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <getopt.h>
4 #include <utmp.h>
5
6 #include "alloc-util.h"
7 #include "conf-files.h"
8 #include "copy.h"
9 #include "def.h"
10 #include "fd-util.h"
11 #include "fileio.h"
12 #include "format-util.h"
13 #include "fs-util.h"
14 #include "hashmap.h"
15 #include "main-func.h"
16 #include "pager.h"
17 #include "path-util.h"
18 #include "pretty-print.h"
19 #include "set.h"
20 #include "selinux-util.h"
21 #include "smack-util.h"
22 #include "specifier.h"
23 #include "string-util.h"
24 #include "strv.h"
25 #include "tmpfile-util-label.h"
26 #include "uid-range.h"
27 #include "user-util.h"
28 #include "utf8.h"
29 #include "util.h"
30
31 typedef enum ItemType {
32 ADD_USER = 'u',
33 ADD_GROUP = 'g',
34 ADD_MEMBER = 'm',
35 ADD_RANGE = 'r',
36 } ItemType;
37
38 typedef struct Item {
39 ItemType type;
40
41 char *name;
42 char *group_name;
43 char *uid_path;
44 char *gid_path;
45 char *description;
46 char *home;
47 char *shell;
48
49 gid_t gid;
50 uid_t uid;
51
52 bool gid_set:1;
53
54 /* When set the group with the specified gid must exist
55 * and the check if a uid clashes with the gid is skipped.
56 */
57 bool id_set_strict:1;
58
59 bool uid_set:1;
60
61 bool todo_user:1;
62 bool todo_group:1;
63 } Item;
64
65 static char *arg_root = NULL;
66 static bool arg_cat_config = false;
67 static const char *arg_replace = NULL;
68 static bool arg_inline = false;
69 static PagerFlags arg_pager_flags = 0;
70
71 static OrderedHashmap *users = NULL, *groups = NULL;
72 static OrderedHashmap *todo_uids = NULL, *todo_gids = NULL;
73 static OrderedHashmap *members = NULL;
74
75 static Hashmap *database_by_uid = NULL, *database_by_username = NULL;
76 static Hashmap *database_by_gid = NULL, *database_by_groupname = NULL;
77 static Set *database_users = NULL, *database_groups = NULL;
78
79 static uid_t search_uid = UID_INVALID;
80 static UidRange *uid_range = NULL;
81 static unsigned n_uid_range = 0;
82
83 STATIC_DESTRUCTOR_REGISTER(groups, ordered_hashmap_freep);
84 STATIC_DESTRUCTOR_REGISTER(users, ordered_hashmap_freep);
85 STATIC_DESTRUCTOR_REGISTER(members, ordered_hashmap_freep);
86 STATIC_DESTRUCTOR_REGISTER(todo_uids, ordered_hashmap_freep);
87 STATIC_DESTRUCTOR_REGISTER(todo_gids, ordered_hashmap_freep);
88 STATIC_DESTRUCTOR_REGISTER(database_by_uid, hashmap_freep);
89 STATIC_DESTRUCTOR_REGISTER(database_by_username, hashmap_freep);
90 STATIC_DESTRUCTOR_REGISTER(database_users, set_free_freep);
91 STATIC_DESTRUCTOR_REGISTER(database_by_gid, hashmap_freep);
92 STATIC_DESTRUCTOR_REGISTER(database_by_groupname, hashmap_freep);
93 STATIC_DESTRUCTOR_REGISTER(database_groups, set_free_freep);
94 STATIC_DESTRUCTOR_REGISTER(uid_range, freep);
95 STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
96
97 static int errno_is_not_exists(int code) {
98 /* See getpwnam(3) and getgrnam(3): those codes and others can be returned if the user or group are
99 * not found. */
100 return IN_SET(code, 0, ENOENT, ESRCH, EBADF, EPERM);
101 }
102
103 static int load_user_database(void) {
104 _cleanup_fclose_ FILE *f = NULL;
105 const char *passwd_path;
106 struct passwd *pw;
107 int r;
108
109 passwd_path = prefix_roota(arg_root, "/etc/passwd");
110 f = fopen(passwd_path, "re");
111 if (!f)
112 return errno == ENOENT ? 0 : -errno;
113
114 r = hashmap_ensure_allocated(&database_by_username, &string_hash_ops);
115 if (r < 0)
116 return r;
117
118 r = hashmap_ensure_allocated(&database_by_uid, NULL);
119 if (r < 0)
120 return r;
121
122 r = set_ensure_allocated(&database_users, NULL);
123 if (r < 0)
124 return r;
125
126 while ((r = fgetpwent_sane(f, &pw)) > 0) {
127 char *n;
128 int k, q;
129
130 n = strdup(pw->pw_name);
131 if (!n)
132 return -ENOMEM;
133
134 k = set_put(database_users, n);
135 if (k < 0) {
136 free(n);
137 return k;
138 }
139
140 k = hashmap_put(database_by_username, n, UID_TO_PTR(pw->pw_uid));
141 if (k < 0 && k != -EEXIST)
142 return k;
143
144 q = hashmap_put(database_by_uid, UID_TO_PTR(pw->pw_uid), n);
145 if (q < 0 && q != -EEXIST)
146 return q;
147 }
148 return r;
149 }
150
151 static int load_group_database(void) {
152 _cleanup_fclose_ FILE *f = NULL;
153 const char *group_path;
154 struct group *gr;
155 int r;
156
157 group_path = prefix_roota(arg_root, "/etc/group");
158 f = fopen(group_path, "re");
159 if (!f)
160 return errno == ENOENT ? 0 : -errno;
161
162 r = hashmap_ensure_allocated(&database_by_groupname, &string_hash_ops);
163 if (r < 0)
164 return r;
165
166 r = hashmap_ensure_allocated(&database_by_gid, NULL);
167 if (r < 0)
168 return r;
169
170 r = set_ensure_allocated(&database_groups, NULL);
171 if (r < 0)
172 return r;
173
174 while ((r = fgetgrent_sane(f, &gr)) > 0) {
175 char *n;
176 int k, q;
177
178 n = strdup(gr->gr_name);
179 if (!n)
180 return -ENOMEM;
181
182 k = set_put(database_groups, n);
183 if (k < 0) {
184 free(n);
185 return k;
186 }
187
188 k = hashmap_put(database_by_groupname, n, GID_TO_PTR(gr->gr_gid));
189 if (k < 0 && k != -EEXIST)
190 return k;
191
192 q = hashmap_put(database_by_gid, GID_TO_PTR(gr->gr_gid), n);
193 if (q < 0 && q != -EEXIST)
194 return q;
195 }
196 return r;
197 }
198
199 static int make_backup(const char *target, const char *x) {
200 _cleanup_close_ int src = -1;
201 _cleanup_fclose_ FILE *dst = NULL;
202 _cleanup_free_ char *dst_tmp = NULL;
203 char *backup;
204 struct timespec ts[2];
205 struct stat st;
206 int r;
207
208 src = open(x, O_RDONLY|O_CLOEXEC|O_NOCTTY);
209 if (src < 0) {
210 if (errno == ENOENT) /* No backup necessary... */
211 return 0;
212
213 return -errno;
214 }
215
216 if (fstat(src, &st) < 0)
217 return -errno;
218
219 r = fopen_temporary_label(target, x, &dst, &dst_tmp);
220 if (r < 0)
221 return r;
222
223 r = copy_bytes(src, fileno(dst), (uint64_t) -1, COPY_REFLINK);
224 if (r < 0)
225 goto fail;
226
227 /* Don't fail on chmod() or chown(). If it stays owned by us
228 * and/or unreadable by others, then it isn't too bad... */
229
230 backup = strjoina(x, "-");
231
232 /* Copy over the access mask */
233 r = chmod_and_chown_unsafe(dst_tmp, st.st_mode & 07777, st.st_uid, st.st_gid);
234 if (r < 0)
235 log_warning_errno(r, "Failed to change access mode or ownership of %s: %m", backup);
236
237 ts[0] = st.st_atim;
238 ts[1] = st.st_mtim;
239 if (futimens(fileno(dst), ts) < 0)
240 log_warning_errno(errno, "Failed to fix access and modification time of %s: %m", backup);
241
242 r = fflush_sync_and_check(dst);
243 if (r < 0)
244 goto fail;
245
246 if (rename(dst_tmp, backup) < 0) {
247 r = -errno;
248 goto fail;
249 }
250
251 return 0;
252
253 fail:
254 (void) unlink(dst_tmp);
255 return r;
256 }
257
258 static int putgrent_with_members(const struct group *gr, FILE *group) {
259 char **a;
260
261 assert(gr);
262 assert(group);
263
264 a = ordered_hashmap_get(members, gr->gr_name);
265 if (a) {
266 _cleanup_strv_free_ char **l = NULL;
267 bool added = false;
268 char **i;
269
270 l = strv_copy(gr->gr_mem);
271 if (!l)
272 return -ENOMEM;
273
274 STRV_FOREACH(i, a) {
275 if (strv_find(l, *i))
276 continue;
277
278 if (strv_extend(&l, *i) < 0)
279 return -ENOMEM;
280
281 added = true;
282 }
283
284 if (added) {
285 struct group t;
286 int r;
287
288 strv_uniq(l);
289 strv_sort(l);
290
291 t = *gr;
292 t.gr_mem = l;
293
294 r = putgrent_sane(&t, group);
295 return r < 0 ? r : 1;
296 }
297 }
298
299 return putgrent_sane(gr, group);
300 }
301
302 #if ENABLE_GSHADOW
303 static int putsgent_with_members(const struct sgrp *sg, FILE *gshadow) {
304 char **a;
305
306 assert(sg);
307 assert(gshadow);
308
309 a = ordered_hashmap_get(members, sg->sg_namp);
310 if (a) {
311 _cleanup_strv_free_ char **l = NULL;
312 bool added = false;
313 char **i;
314
315 l = strv_copy(sg->sg_mem);
316 if (!l)
317 return -ENOMEM;
318
319 STRV_FOREACH(i, a) {
320 if (strv_find(l, *i))
321 continue;
322
323 if (strv_extend(&l, *i) < 0)
324 return -ENOMEM;
325
326 added = true;
327 }
328
329 if (added) {
330 struct sgrp t;
331 int r;
332
333 strv_uniq(l);
334 strv_sort(l);
335
336 t = *sg;
337 t.sg_mem = l;
338
339 r = putsgent_sane(&t, gshadow);
340 return r < 0 ? r : 1;
341 }
342 }
343
344 return putsgent_sane(sg, gshadow);
345 }
346 #endif
347
348 static const char* default_shell(uid_t uid) {
349 return uid == 0 ? "/bin/sh" : NOLOGIN;
350 }
351
352 static int write_temporary_passwd(const char *passwd_path, FILE **tmpfile, char **tmpfile_path) {
353 _cleanup_fclose_ FILE *original = NULL, *passwd = NULL;
354 _cleanup_(unlink_and_freep) char *passwd_tmp = NULL;
355 struct passwd *pw = NULL;
356 Iterator iterator;
357 Item *i;
358 int r;
359
360 if (ordered_hashmap_size(todo_uids) == 0)
361 return 0;
362
363 r = fopen_temporary_label("/etc/passwd", passwd_path, &passwd, &passwd_tmp);
364 if (r < 0)
365 return r;
366
367 original = fopen(passwd_path, "re");
368 if (original) {
369
370 r = sync_rights(original, passwd_tmp);
371 if (r < 0)
372 return r;
373
374 while ((r = fgetpwent_sane(original, &pw)) > 0) {
375
376 i = ordered_hashmap_get(users, pw->pw_name);
377 if (i && i->todo_user)
378 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
379 "%s: User \"%s\" already exists.",
380 passwd_path, pw->pw_name);
381
382 if (ordered_hashmap_contains(todo_uids, UID_TO_PTR(pw->pw_uid)))
383 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
384 "%s: Detected collision for UID " UID_FMT ".",
385 passwd_path, pw->pw_uid);
386
387 /* Make sure we keep the NIS entries (if any) at the end. */
388 if (IN_SET(pw->pw_name[0], '+', '-'))
389 break;
390
391 r = putpwent_sane(pw, passwd);
392 if (r < 0)
393 return r;
394 }
395 if (r < 0)
396 return r;
397
398 } else {
399 if (errno != ENOENT)
400 return -errno;
401 if (fchmod(fileno(passwd), 0644) < 0)
402 return -errno;
403 }
404
405 ORDERED_HASHMAP_FOREACH(i, todo_uids, iterator) {
406 struct passwd n = {
407 .pw_name = i->name,
408 .pw_uid = i->uid,
409 .pw_gid = i->gid,
410 .pw_gecos = i->description,
411
412 /* "x" means the password is stored in the shadow file */
413 .pw_passwd = (char*) "x",
414
415 /* We default to the root directory as home */
416 .pw_dir = i->home ?: (char*) "/",
417
418 /* Initialize the shell to nologin, with one exception:
419 * for root we patch in something special */
420 .pw_shell = i->shell ?: (char*) default_shell(i->uid),
421 };
422
423 r = putpwent_sane(&n, passwd);
424 if (r < 0)
425 return r;
426 }
427
428 /* Append the remaining NIS entries if any */
429 while (pw) {
430 r = putpwent_sane(pw, passwd);
431 if (r < 0)
432 return r;
433
434 r = fgetpwent_sane(original, &pw);
435 if (r < 0)
436 return r;
437 if (r == 0)
438 break;
439 }
440
441 r = fflush_and_check(passwd);
442 if (r < 0)
443 return r;
444
445 *tmpfile = TAKE_PTR(passwd);
446 *tmpfile_path = TAKE_PTR(passwd_tmp);
447
448 return 0;
449 }
450
451 static int write_temporary_shadow(const char *shadow_path, FILE **tmpfile, char **tmpfile_path) {
452 _cleanup_fclose_ FILE *original = NULL, *shadow = NULL;
453 _cleanup_(unlink_and_freep) char *shadow_tmp = NULL;
454 struct spwd *sp = NULL;
455 Iterator iterator;
456 long lstchg;
457 Item *i;
458 int r;
459
460 if (ordered_hashmap_size(todo_uids) == 0)
461 return 0;
462
463 r = fopen_temporary_label("/etc/shadow", shadow_path, &shadow, &shadow_tmp);
464 if (r < 0)
465 return r;
466
467 lstchg = (long) (now(CLOCK_REALTIME) / USEC_PER_DAY);
468
469 original = fopen(shadow_path, "re");
470 if (original) {
471
472 r = sync_rights(original, shadow_tmp);
473 if (r < 0)
474 return r;
475
476 while ((r = fgetspent_sane(original, &sp)) > 0) {
477
478 i = ordered_hashmap_get(users, sp->sp_namp);
479 if (i && i->todo_user) {
480 /* we will update the existing entry */
481 sp->sp_lstchg = lstchg;
482
483 /* only the /etc/shadow stage is left, so we can
484 * safely remove the item from the todo set */
485 i->todo_user = false;
486 ordered_hashmap_remove(todo_uids, UID_TO_PTR(i->uid));
487 }
488
489 /* Make sure we keep the NIS entries (if any) at the end. */
490 if (IN_SET(sp->sp_namp[0], '+', '-'))
491 break;
492
493 r = putspent_sane(sp, shadow);
494 if (r < 0)
495 return r;
496 }
497 if (r < 0)
498 return r;
499
500 } else {
501 if (errno != ENOENT)
502 return -errno;
503 if (fchmod(fileno(shadow), 0000) < 0)
504 return -errno;
505 }
506
507 ORDERED_HASHMAP_FOREACH(i, todo_uids, iterator) {
508 struct spwd n = {
509 .sp_namp = i->name,
510 .sp_pwdp = (char*) "!*", /* lock this password, and make it invalid */
511 .sp_lstchg = lstchg,
512 .sp_min = -1,
513 .sp_max = -1,
514 .sp_warn = -1,
515 .sp_inact = -1,
516 .sp_expire = -1,
517 .sp_flag = (unsigned long) -1, /* this appears to be what everybody does ... */
518 };
519
520 r = putspent_sane(&n, shadow);
521 if (r < 0)
522 return r;
523 }
524
525 /* Append the remaining NIS entries if any */
526 while (sp) {
527 r = putspent_sane(sp, shadow);
528 if (r < 0)
529 return r;
530
531 r = fgetspent_sane(original, &sp);
532 if (r < 0)
533 return r;
534 if (r == 0)
535 break;
536 }
537 if (!IN_SET(errno, 0, ENOENT))
538 return -errno;
539
540 r = fflush_sync_and_check(shadow);
541 if (r < 0)
542 return r;
543
544 *tmpfile = TAKE_PTR(shadow);
545 *tmpfile_path = TAKE_PTR(shadow_tmp);
546
547 return 0;
548 }
549
550 static int write_temporary_group(const char *group_path, FILE **tmpfile, char **tmpfile_path) {
551 _cleanup_fclose_ FILE *original = NULL, *group = NULL;
552 _cleanup_(unlink_and_freep) char *group_tmp = NULL;
553 bool group_changed = false;
554 struct group *gr = NULL;
555 Iterator iterator;
556 Item *i;
557 int r;
558
559 if (ordered_hashmap_size(todo_gids) == 0 && ordered_hashmap_size(members) == 0)
560 return 0;
561
562 r = fopen_temporary_label("/etc/group", group_path, &group, &group_tmp);
563 if (r < 0)
564 return r;
565
566 original = fopen(group_path, "re");
567 if (original) {
568
569 r = sync_rights(original, group_tmp);
570 if (r < 0)
571 return r;
572
573 while ((r = fgetgrent_sane(original, &gr)) > 0) {
574 /* Safety checks against name and GID collisions. Normally,
575 * this should be unnecessary, but given that we look at the
576 * entries anyway here, let's make an extra verification
577 * step that we don't generate duplicate entries. */
578
579 i = ordered_hashmap_get(groups, gr->gr_name);
580 if (i && i->todo_group)
581 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
582 "%s: Group \"%s\" already exists.",
583 group_path, gr->gr_name);
584
585 if (ordered_hashmap_contains(todo_gids, GID_TO_PTR(gr->gr_gid)))
586 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
587 "%s: Detected collision for GID " GID_FMT ".",
588 group_path, gr->gr_gid);
589
590 /* Make sure we keep the NIS entries (if any) at the end. */
591 if (IN_SET(gr->gr_name[0], '+', '-'))
592 break;
593
594 r = putgrent_with_members(gr, group);
595 if (r < 0)
596 return r;
597 if (r > 0)
598 group_changed = true;
599 }
600 if (r < 0)
601 return r;
602
603 } else {
604 if (errno != ENOENT)
605 return -errno;
606 if (fchmod(fileno(group), 0644) < 0)
607 return -errno;
608 }
609
610 ORDERED_HASHMAP_FOREACH(i, todo_gids, iterator) {
611 struct group n = {
612 .gr_name = i->name,
613 .gr_gid = i->gid,
614 .gr_passwd = (char*) "x",
615 };
616
617 r = putgrent_with_members(&n, group);
618 if (r < 0)
619 return r;
620
621 group_changed = true;
622 }
623
624 /* Append the remaining NIS entries if any */
625 while (gr) {
626 r = putgrent_sane(gr, group);
627 if (r < 0)
628 return r;
629
630 r = fgetgrent_sane(original, &gr);
631 if (r < 0)
632 return r;
633 if (r == 0)
634 break;
635 }
636
637 r = fflush_sync_and_check(group);
638 if (r < 0)
639 return r;
640
641 if (group_changed) {
642 *tmpfile = TAKE_PTR(group);
643 *tmpfile_path = TAKE_PTR(group_tmp);
644 }
645 return 0;
646 }
647
648 static int write_temporary_gshadow(const char * gshadow_path, FILE **tmpfile, char **tmpfile_path) {
649 #if ENABLE_GSHADOW
650 _cleanup_fclose_ FILE *original = NULL, *gshadow = NULL;
651 _cleanup_(unlink_and_freep) char *gshadow_tmp = NULL;
652 bool group_changed = false;
653 Iterator iterator;
654 Item *i;
655 int r;
656
657 if (ordered_hashmap_size(todo_gids) == 0 && ordered_hashmap_size(members) == 0)
658 return 0;
659
660 r = fopen_temporary_label("/etc/gshadow", gshadow_path, &gshadow, &gshadow_tmp);
661 if (r < 0)
662 return r;
663
664 original = fopen(gshadow_path, "re");
665 if (original) {
666 struct sgrp *sg;
667
668 r = sync_rights(original, gshadow_tmp);
669 if (r < 0)
670 return r;
671
672 while ((r = fgetsgent_sane(original, &sg)) > 0) {
673
674 i = ordered_hashmap_get(groups, sg->sg_namp);
675 if (i && i->todo_group)
676 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
677 "%s: Group \"%s\" already exists.",
678 gshadow_path, sg->sg_namp);
679
680 r = putsgent_with_members(sg, gshadow);
681 if (r < 0)
682 return r;
683 if (r > 0)
684 group_changed = true;
685 }
686 if (r < 0)
687 return r;
688
689 } else {
690 if (errno != ENOENT)
691 return -errno;
692 if (fchmod(fileno(gshadow), 0000) < 0)
693 return -errno;
694 }
695
696 ORDERED_HASHMAP_FOREACH(i, todo_gids, iterator) {
697 struct sgrp n = {
698 .sg_namp = i->name,
699 .sg_passwd = (char*) "!!",
700 };
701
702 r = putsgent_with_members(&n, gshadow);
703 if (r < 0)
704 return r;
705
706 group_changed = true;
707 }
708
709 r = fflush_sync_and_check(gshadow);
710 if (r < 0)
711 return r;
712
713 if (group_changed) {
714 *tmpfile = TAKE_PTR(gshadow);
715 *tmpfile_path = TAKE_PTR(gshadow_tmp);
716 }
717 return 0;
718 #else
719 return 0;
720 #endif
721 }
722
723 static int write_files(void) {
724 _cleanup_fclose_ FILE *passwd = NULL, *group = NULL, *shadow = NULL, *gshadow = NULL;
725 _cleanup_(unlink_and_freep) char *passwd_tmp = NULL, *group_tmp = NULL, *shadow_tmp = NULL, *gshadow_tmp = NULL;
726 const char *passwd_path = NULL, *group_path = NULL, *shadow_path = NULL, *gshadow_path = NULL;
727 int r;
728
729 passwd_path = prefix_roota(arg_root, "/etc/passwd");
730 shadow_path = prefix_roota(arg_root, "/etc/shadow");
731 group_path = prefix_roota(arg_root, "/etc/group");
732 gshadow_path = prefix_roota(arg_root, "/etc/gshadow");
733
734 r = write_temporary_group(group_path, &group, &group_tmp);
735 if (r < 0)
736 return r;
737
738 r = write_temporary_gshadow(gshadow_path, &gshadow, &gshadow_tmp);
739 if (r < 0)
740 return r;
741
742 r = write_temporary_passwd(passwd_path, &passwd, &passwd_tmp);
743 if (r < 0)
744 return r;
745
746 r = write_temporary_shadow(shadow_path, &shadow, &shadow_tmp);
747 if (r < 0)
748 return r;
749
750 /* Make a backup of the old files */
751 if (group) {
752 r = make_backup("/etc/group", group_path);
753 if (r < 0)
754 return r;
755 }
756 if (gshadow) {
757 r = make_backup("/etc/gshadow", gshadow_path);
758 if (r < 0)
759 return r;
760 }
761
762 if (passwd) {
763 r = make_backup("/etc/passwd", passwd_path);
764 if (r < 0)
765 return r;
766 }
767 if (shadow) {
768 r = make_backup("/etc/shadow", shadow_path);
769 if (r < 0)
770 return r;
771 }
772
773 /* And make the new files count */
774 if (group) {
775 r = rename_and_apply_smack(group_tmp, group_path);
776 if (r < 0)
777 return r;
778
779 group_tmp = mfree(group_tmp);
780 }
781 if (gshadow) {
782 r = rename_and_apply_smack(gshadow_tmp, gshadow_path);
783 if (r < 0)
784 return r;
785
786 gshadow_tmp = mfree(gshadow_tmp);
787 }
788
789 if (passwd) {
790 r = rename_and_apply_smack(passwd_tmp, passwd_path);
791 if (r < 0)
792 return r;
793
794 passwd_tmp = mfree(passwd_tmp);
795 }
796 if (shadow) {
797 r = rename_and_apply_smack(shadow_tmp, shadow_path);
798 if (r < 0)
799 return r;
800
801 shadow_tmp = mfree(shadow_tmp);
802 }
803
804 return 0;
805 }
806
807 static int uid_is_ok(uid_t uid, const char *name, bool check_with_gid) {
808 struct passwd *p;
809 struct group *g;
810 const char *n;
811 Item *i;
812
813 /* Let's see if we already have assigned the UID a second time */
814 if (ordered_hashmap_get(todo_uids, UID_TO_PTR(uid)))
815 return 0;
816
817 /* Try to avoid using uids that are already used by a group
818 * that doesn't have the same name as our new user. */
819 if (check_with_gid) {
820 i = ordered_hashmap_get(todo_gids, GID_TO_PTR(uid));
821 if (i && !streq(i->name, name))
822 return 0;
823 }
824
825 /* Let's check the files directly */
826 if (hashmap_contains(database_by_uid, UID_TO_PTR(uid)))
827 return 0;
828
829 if (check_with_gid) {
830 n = hashmap_get(database_by_gid, GID_TO_PTR(uid));
831 if (n && !streq(n, name))
832 return 0;
833 }
834
835 /* Let's also check via NSS, to avoid UID clashes over LDAP and such, just in case */
836 if (!arg_root) {
837 errno = 0;
838 p = getpwuid(uid);
839 if (p)
840 return 0;
841 if (!IN_SET(errno, 0, ENOENT))
842 return -errno;
843
844 if (check_with_gid) {
845 errno = 0;
846 g = getgrgid((gid_t) uid);
847 if (g) {
848 if (!streq(g->gr_name, name))
849 return 0;
850 } else if (!IN_SET(errno, 0, ENOENT))
851 return -errno;
852 }
853 }
854
855 return 1;
856 }
857
858 static int root_stat(const char *p, struct stat *st) {
859 const char *fix;
860
861 fix = prefix_roota(arg_root, p);
862 if (stat(fix, st) < 0)
863 return -errno;
864
865 return 0;
866 }
867
868 static int read_id_from_file(Item *i, uid_t *_uid, gid_t *_gid) {
869 struct stat st;
870 bool found_uid = false, found_gid = false;
871 uid_t uid = 0;
872 gid_t gid = 0;
873
874 assert(i);
875
876 /* First, try to get the gid directly */
877 if (_gid && i->gid_path && root_stat(i->gid_path, &st) >= 0) {
878 gid = st.st_gid;
879 found_gid = true;
880 }
881
882 /* Then, try to get the uid directly */
883 if ((_uid || (_gid && !found_gid))
884 && i->uid_path
885 && root_stat(i->uid_path, &st) >= 0) {
886
887 uid = st.st_uid;
888 found_uid = true;
889
890 /* If we need the gid, but had no success yet, also derive it from the uid path */
891 if (_gid && !found_gid) {
892 gid = st.st_gid;
893 found_gid = true;
894 }
895 }
896
897 /* If that didn't work yet, then let's reuse the gid as uid */
898 if (_uid && !found_uid && i->gid_path) {
899
900 if (found_gid) {
901 uid = (uid_t) gid;
902 found_uid = true;
903 } else if (root_stat(i->gid_path, &st) >= 0) {
904 uid = (uid_t) st.st_gid;
905 found_uid = true;
906 }
907 }
908
909 if (_uid) {
910 if (!found_uid)
911 return 0;
912
913 *_uid = uid;
914 }
915
916 if (_gid) {
917 if (!found_gid)
918 return 0;
919
920 *_gid = gid;
921 }
922
923 return 1;
924 }
925
926 static int add_user(Item *i) {
927 void *z;
928 int r;
929
930 assert(i);
931
932 /* Check the database directly */
933 z = hashmap_get(database_by_username, i->name);
934 if (z) {
935 log_debug("User %s already exists.", i->name);
936 i->uid = PTR_TO_UID(z);
937 i->uid_set = true;
938 return 0;
939 }
940
941 if (!arg_root) {
942 struct passwd *p;
943
944 /* Also check NSS */
945 errno = 0;
946 p = getpwnam(i->name);
947 if (p) {
948 log_debug("User %s already exists.", i->name);
949 i->uid = p->pw_uid;
950 i->uid_set = true;
951
952 r = free_and_strdup(&i->description, p->pw_gecos);
953 if (r < 0)
954 return log_oom();
955
956 return 0;
957 }
958 if (!errno_is_not_exists(errno))
959 return log_error_errno(errno, "Failed to check if user %s already exists: %m", i->name);
960 }
961
962 /* Try to use the suggested numeric uid */
963 if (i->uid_set) {
964 r = uid_is_ok(i->uid, i->name, !i->id_set_strict);
965 if (r < 0)
966 return log_error_errno(r, "Failed to verify uid " UID_FMT ": %m", i->uid);
967 if (r == 0) {
968 log_debug("Suggested user ID " UID_FMT " for %s already used.", i->uid, i->name);
969 i->uid_set = false;
970 }
971 }
972
973 /* If that didn't work, try to read it from the specified path */
974 if (!i->uid_set) {
975 uid_t c;
976
977 if (read_id_from_file(i, &c, NULL) > 0) {
978
979 if (c <= 0 || !uid_range_contains(uid_range, n_uid_range, c))
980 log_debug("User ID " UID_FMT " of file not suitable for %s.", c, i->name);
981 else {
982 r = uid_is_ok(c, i->name, true);
983 if (r < 0)
984 return log_error_errno(r, "Failed to verify uid " UID_FMT ": %m", i->uid);
985 else if (r > 0) {
986 i->uid = c;
987 i->uid_set = true;
988 } else
989 log_debug("User ID " UID_FMT " of file for %s is already used.", c, i->name);
990 }
991 }
992 }
993
994 /* Otherwise, try to reuse the group ID */
995 if (!i->uid_set && i->gid_set) {
996 r = uid_is_ok((uid_t) i->gid, i->name, true);
997 if (r < 0)
998 return log_error_errno(r, "Failed to verify uid " UID_FMT ": %m", i->uid);
999 if (r > 0) {
1000 i->uid = (uid_t) i->gid;
1001 i->uid_set = true;
1002 }
1003 }
1004
1005 /* And if that didn't work either, let's try to find a free one */
1006 if (!i->uid_set) {
1007 for (;;) {
1008 r = uid_range_next_lower(uid_range, n_uid_range, &search_uid);
1009 if (r < 0)
1010 return log_error_errno(r, "No free user ID available for %s.", i->name);
1011
1012 r = uid_is_ok(search_uid, i->name, true);
1013 if (r < 0)
1014 return log_error_errno(r, "Failed to verify uid " UID_FMT ": %m", i->uid);
1015 else if (r > 0)
1016 break;
1017 }
1018
1019 i->uid_set = true;
1020 i->uid = search_uid;
1021 }
1022
1023 r = ordered_hashmap_ensure_allocated(&todo_uids, NULL);
1024 if (r < 0)
1025 return log_oom();
1026
1027 r = ordered_hashmap_put(todo_uids, UID_TO_PTR(i->uid), i);
1028 if (r < 0)
1029 return log_oom();
1030
1031 i->todo_user = true;
1032 log_info("Creating user %s (%s) with uid " UID_FMT " and gid " GID_FMT ".", i->name, strna(i->description), i->uid, i->gid);
1033
1034 return 0;
1035 }
1036
1037 static int gid_is_ok(gid_t gid) {
1038 struct group *g;
1039 struct passwd *p;
1040
1041 if (ordered_hashmap_get(todo_gids, GID_TO_PTR(gid)))
1042 return 0;
1043
1044 /* Avoid reusing gids that are already used by a different user */
1045 if (ordered_hashmap_get(todo_uids, UID_TO_PTR(gid)))
1046 return 0;
1047
1048 if (hashmap_contains(database_by_gid, GID_TO_PTR(gid)))
1049 return 0;
1050
1051 if (hashmap_contains(database_by_uid, UID_TO_PTR(gid)))
1052 return 0;
1053
1054 if (!arg_root) {
1055 errno = 0;
1056 g = getgrgid(gid);
1057 if (g)
1058 return 0;
1059 if (!IN_SET(errno, 0, ENOENT))
1060 return -errno;
1061
1062 errno = 0;
1063 p = getpwuid((uid_t) gid);
1064 if (p)
1065 return 0;
1066 if (!IN_SET(errno, 0, ENOENT))
1067 return -errno;
1068 }
1069
1070 return 1;
1071 }
1072
1073 static int get_gid_by_name(const char *name, gid_t *gid) {
1074 void *z;
1075
1076 assert(gid);
1077
1078 /* Check the database directly */
1079 z = hashmap_get(database_by_groupname, name);
1080 if (z) {
1081 *gid = PTR_TO_GID(z);
1082 return 0;
1083 }
1084
1085 /* Also check NSS */
1086 if (!arg_root) {
1087 struct group *g;
1088
1089 errno = 0;
1090 g = getgrnam(name);
1091 if (g) {
1092 *gid = g->gr_gid;
1093 return 0;
1094 }
1095 if (!errno_is_not_exists(errno))
1096 return log_error_errno(errno, "Failed to check if group %s already exists: %m", name);
1097 }
1098
1099 return -ENOENT;
1100 }
1101
1102 static int add_group(Item *i) {
1103 int r;
1104
1105 assert(i);
1106
1107 r = get_gid_by_name(i->name, &i->gid);
1108 if (r != -ENOENT) {
1109 if (r < 0)
1110 return r;
1111 log_debug("Group %s already exists.", i->name);
1112 i->gid_set = true;
1113 return 0;
1114 }
1115
1116 /* Try to use the suggested numeric gid */
1117 if (i->gid_set) {
1118 r = gid_is_ok(i->gid);
1119 if (r < 0)
1120 return log_error_errno(r, "Failed to verify gid " GID_FMT ": %m", i->gid);
1121 if (i->id_set_strict) {
1122 /* If we require the gid to already exist we can return here:
1123 * r > 0: means the gid does not exist -> fail
1124 * r == 0: means the gid exists -> nothing more to do.
1125 */
1126 if (r > 0)
1127 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1128 "Failed to create %s: please create GID %d",
1129 i->name, i->gid);
1130 if (r == 0)
1131 return 0;
1132 }
1133 if (r == 0) {
1134 log_debug("Suggested group ID " GID_FMT " for %s already used.", i->gid, i->name);
1135 i->gid_set = false;
1136 }
1137 }
1138
1139 /* Try to reuse the numeric uid, if there's one */
1140 if (!i->gid_set && i->uid_set) {
1141 r = gid_is_ok((gid_t) i->uid);
1142 if (r < 0)
1143 return log_error_errno(r, "Failed to verify gid " GID_FMT ": %m", i->gid);
1144 if (r > 0) {
1145 i->gid = (gid_t) i->uid;
1146 i->gid_set = true;
1147 }
1148 }
1149
1150 /* If that didn't work, try to read it from the specified path */
1151 if (!i->gid_set) {
1152 gid_t c;
1153
1154 if (read_id_from_file(i, NULL, &c) > 0) {
1155
1156 if (c <= 0 || !uid_range_contains(uid_range, n_uid_range, c))
1157 log_debug("Group ID " GID_FMT " of file not suitable for %s.", c, i->name);
1158 else {
1159 r = gid_is_ok(c);
1160 if (r < 0)
1161 return log_error_errno(r, "Failed to verify gid " GID_FMT ": %m", i->gid);
1162 else if (r > 0) {
1163 i->gid = c;
1164 i->gid_set = true;
1165 } else
1166 log_debug("Group ID " GID_FMT " of file for %s already used.", c, i->name);
1167 }
1168 }
1169 }
1170
1171 /* And if that didn't work either, let's try to find a free one */
1172 if (!i->gid_set) {
1173 for (;;) {
1174 /* We look for new GIDs in the UID pool! */
1175 r = uid_range_next_lower(uid_range, n_uid_range, &search_uid);
1176 if (r < 0)
1177 return log_error_errno(r, "No free group ID available for %s.", i->name);
1178
1179 r = gid_is_ok(search_uid);
1180 if (r < 0)
1181 return log_error_errno(r, "Failed to verify gid " GID_FMT ": %m", i->gid);
1182 else if (r > 0)
1183 break;
1184 }
1185
1186 i->gid_set = true;
1187 i->gid = search_uid;
1188 }
1189
1190 r = ordered_hashmap_ensure_allocated(&todo_gids, NULL);
1191 if (r < 0)
1192 return log_oom();
1193
1194 r = ordered_hashmap_put(todo_gids, GID_TO_PTR(i->gid), i);
1195 if (r < 0)
1196 return log_oom();
1197
1198 i->todo_group = true;
1199 log_info("Creating group %s with gid " GID_FMT ".", i->name, i->gid);
1200
1201 return 0;
1202 }
1203
1204 static int process_item(Item *i) {
1205 int r;
1206
1207 assert(i);
1208
1209 switch (i->type) {
1210
1211 case ADD_USER: {
1212 Item *j;
1213
1214 j = ordered_hashmap_get(groups, i->group_name ?: i->name);
1215 if (j && j->todo_group) {
1216 /* When a group with the target name is already in queue,
1217 * use the information about the group and do not create
1218 * duplicated group entry. */
1219 i->gid_set = j->gid_set;
1220 i->gid = j->gid;
1221 i->id_set_strict = true;
1222 } else if (i->group_name) {
1223 /* When a group name was given instead of a GID and it's
1224 * not in queue, then it must already exist. */
1225 r = get_gid_by_name(i->group_name, &i->gid);
1226 if (r < 0)
1227 return log_error_errno(r, "Group %s not found.", i->group_name);
1228 i->gid_set = true;
1229 i->id_set_strict = true;
1230 } else {
1231 r = add_group(i);
1232 if (r < 0)
1233 return r;
1234 }
1235
1236 return add_user(i);
1237 }
1238
1239 case ADD_GROUP:
1240 return add_group(i);
1241
1242 default:
1243 assert_not_reached("Unknown item type");
1244 }
1245 }
1246
1247 static Item* item_free(Item *i) {
1248 if (!i)
1249 return NULL;
1250
1251 free(i->name);
1252 free(i->group_name);
1253 free(i->uid_path);
1254 free(i->gid_path);
1255 free(i->description);
1256 free(i->home);
1257 free(i->shell);
1258 return mfree(i);
1259 }
1260
1261 DEFINE_TRIVIAL_CLEANUP_FUNC(Item*, item_free);
1262 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_hash_ops, char, string_hash_func, string_compare_func, Item, item_free);
1263
1264 static int add_implicit(void) {
1265 char *g, **l;
1266 Iterator iterator;
1267 int r;
1268
1269 /* Implicitly create additional users and groups, if they were listed in "m" lines */
1270 ORDERED_HASHMAP_FOREACH_KEY(l, g, members, iterator) {
1271 char **m;
1272
1273 STRV_FOREACH(m, l)
1274 if (!ordered_hashmap_get(users, *m)) {
1275 _cleanup_(item_freep) Item *j = NULL;
1276
1277 r = ordered_hashmap_ensure_allocated(&users, &item_hash_ops);
1278 if (r < 0)
1279 return log_oom();
1280
1281 j = new0(Item, 1);
1282 if (!j)
1283 return log_oom();
1284
1285 j->type = ADD_USER;
1286 j->name = strdup(*m);
1287 if (!j->name)
1288 return log_oom();
1289
1290 r = ordered_hashmap_put(users, j->name, j);
1291 if (r < 0)
1292 return log_oom();
1293
1294 log_debug("Adding implicit user '%s' due to m line", j->name);
1295 j = NULL;
1296 }
1297
1298 if (!(ordered_hashmap_get(users, g) ||
1299 ordered_hashmap_get(groups, g))) {
1300 _cleanup_(item_freep) Item *j = NULL;
1301
1302 r = ordered_hashmap_ensure_allocated(&groups, &item_hash_ops);
1303 if (r < 0)
1304 return log_oom();
1305
1306 j = new0(Item, 1);
1307 if (!j)
1308 return log_oom();
1309
1310 j->type = ADD_GROUP;
1311 j->name = strdup(g);
1312 if (!j->name)
1313 return log_oom();
1314
1315 r = ordered_hashmap_put(groups, j->name, j);
1316 if (r < 0)
1317 return log_oom();
1318
1319 log_debug("Adding implicit group '%s' due to m line", j->name);
1320 j = NULL;
1321 }
1322 }
1323
1324 return 0;
1325 }
1326
1327 static bool item_equal(Item *a, Item *b) {
1328 assert(a);
1329 assert(b);
1330
1331 if (a->type != b->type)
1332 return false;
1333
1334 if (!streq_ptr(a->name, b->name))
1335 return false;
1336
1337 if (!streq_ptr(a->uid_path, b->uid_path))
1338 return false;
1339
1340 if (!streq_ptr(a->gid_path, b->gid_path))
1341 return false;
1342
1343 if (!streq_ptr(a->description, b->description))
1344 return false;
1345
1346 if (a->uid_set != b->uid_set)
1347 return false;
1348
1349 if (a->uid_set && a->uid != b->uid)
1350 return false;
1351
1352 if (a->gid_set != b->gid_set)
1353 return false;
1354
1355 if (a->gid_set && a->gid != b->gid)
1356 return false;
1357
1358 if (!streq_ptr(a->home, b->home))
1359 return false;
1360
1361 if (!streq_ptr(a->shell, b->shell))
1362 return false;
1363
1364 return true;
1365 }
1366
1367 static int parse_line(const char *fname, unsigned line, const char *buffer) {
1368
1369 static const Specifier specifier_table[] = {
1370 { 'm', specifier_machine_id, NULL },
1371 { 'b', specifier_boot_id, NULL },
1372 { 'H', specifier_host_name, NULL },
1373 { 'l', specifier_short_host_name, NULL },
1374 { 'v', specifier_kernel_release, NULL },
1375 { 'a', specifier_architecture, NULL },
1376 { 'o', specifier_os_id, NULL },
1377 { 'w', specifier_os_version_id, NULL },
1378 { 'B', specifier_os_build_id, NULL },
1379 { 'W', specifier_os_variant_id, NULL },
1380 { 'T', specifier_tmp_dir, NULL },
1381 { 'V', specifier_var_tmp_dir, NULL },
1382 {}
1383 };
1384
1385 _cleanup_free_ char *action = NULL,
1386 *name = NULL, *resolved_name = NULL,
1387 *id = NULL, *resolved_id = NULL,
1388 *description = NULL, *resolved_description = NULL,
1389 *home = NULL, *resolved_home = NULL,
1390 *shell = NULL, *resolved_shell = NULL;
1391 _cleanup_(item_freep) Item *i = NULL;
1392 Item *existing;
1393 OrderedHashmap *h;
1394 int r;
1395 const char *p;
1396
1397 assert(fname);
1398 assert(line >= 1);
1399 assert(buffer);
1400
1401 /* Parse columns */
1402 p = buffer;
1403 r = extract_many_words(&p, NULL, EXTRACT_UNQUOTE,
1404 &action, &name, &id, &description, &home, &shell, NULL);
1405 if (r < 0)
1406 return log_error_errno(r, "[%s:%u] Syntax error.", fname, line);
1407 if (r < 2)
1408 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1409 "[%s:%u] Missing action and name columns.", fname, line);
1410 if (!isempty(p))
1411 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1412 "[%s:%u] Trailing garbage.", fname, line);
1413
1414 /* Verify action */
1415 if (strlen(action) != 1)
1416 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1417 "[%s:%u] Unknown modifier '%s'", fname, line, action);
1418
1419 if (!IN_SET(action[0], ADD_USER, ADD_GROUP, ADD_MEMBER, ADD_RANGE))
1420 return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
1421 "[%s:%u] Unknown command type '%c'.", fname, line, action[0]);
1422
1423 /* Verify name */
1424 if (empty_or_dash(name))
1425 name = mfree(name);
1426
1427 if (name) {
1428 r = specifier_printf(name, specifier_table, NULL, &resolved_name);
1429 if (r < 0)
1430 return log_error_errno(r, "[%s:%u] Failed to replace specifiers in '%s': %m", fname, line, name);
1431
1432 if (!valid_user_group_name(resolved_name, 0))
1433 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1434 "[%s:%u] '%s' is not a valid user or group name.",
1435 fname, line, resolved_name);
1436 }
1437
1438 /* Verify id */
1439 if (empty_or_dash(id))
1440 id = mfree(id);
1441
1442 if (id) {
1443 r = specifier_printf(id, specifier_table, NULL, &resolved_id);
1444 if (r < 0)
1445 return log_error_errno(r, "[%s:%u] Failed to replace specifiers in '%s': %m",
1446 fname, line, name);
1447 }
1448
1449 /* Verify description */
1450 if (empty_or_dash(description))
1451 description = mfree(description);
1452
1453 if (description) {
1454 r = specifier_printf(description, specifier_table, NULL, &resolved_description);
1455 if (r < 0)
1456 return log_error_errno(r, "[%s:%u] Failed to replace specifiers in '%s': %m",
1457 fname, line, description);
1458
1459 if (!valid_gecos(resolved_description))
1460 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1461 "[%s:%u] '%s' is not a valid GECOS field.",
1462 fname, line, resolved_description);
1463 }
1464
1465 /* Verify home */
1466 if (empty_or_dash(home))
1467 home = mfree(home);
1468
1469 if (home) {
1470 r = specifier_printf(home, specifier_table, NULL, &resolved_home);
1471 if (r < 0)
1472 return log_error_errno(r, "[%s:%u] Failed to replace specifiers in '%s': %m",
1473 fname, line, home);
1474
1475 if (!valid_home(resolved_home))
1476 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1477 "[%s:%u] '%s' is not a valid home directory field.",
1478 fname, line, resolved_home);
1479 }
1480
1481 /* Verify shell */
1482 if (empty_or_dash(shell))
1483 shell = mfree(shell);
1484
1485 if (shell) {
1486 r = specifier_printf(shell, specifier_table, NULL, &resolved_shell);
1487 if (r < 0)
1488 return log_error_errno(r, "[%s:%u] Failed to replace specifiers in '%s': %m",
1489 fname, line, shell);
1490
1491 if (!valid_shell(resolved_shell))
1492 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1493 "[%s:%u] '%s' is not a valid login shell field.",
1494 fname, line, resolved_shell);
1495 }
1496
1497 switch (action[0]) {
1498
1499 case ADD_RANGE:
1500 if (resolved_name)
1501 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1502 "[%s:%u] Lines of type 'r' don't take a name field.",
1503 fname, line);
1504
1505 if (!resolved_id)
1506 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1507 "[%s:%u] Lines of type 'r' require a ID range in the third field.",
1508 fname, line);
1509
1510 if (description || home || shell)
1511 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1512 "[%s:%u] Lines of type '%c' don't take a %s field.",
1513 fname, line, action[0],
1514 description ? "GECOS" : home ? "home directory" : "login shell");
1515
1516 r = uid_range_add_str(&uid_range, &n_uid_range, resolved_id);
1517 if (r < 0)
1518 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1519 "[%s:%u] Invalid UID range %s.", fname, line, resolved_id);
1520
1521 return 0;
1522
1523 case ADD_MEMBER: {
1524 /* Try to extend an existing member or group item */
1525 if (!name)
1526 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1527 "[%s:%u] Lines of type 'm' require a user name in the second field.",
1528 fname, line);
1529
1530 if (!resolved_id)
1531 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1532 "[%s:%u] Lines of type 'm' require a group name in the third field.",
1533 fname, line);
1534
1535 if (!valid_user_group_name(resolved_id, 0))
1536 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1537 "[%s:%u] '%s' is not a valid user or group name.",
1538 fname, line, resolved_id);
1539
1540 if (description || home || shell)
1541 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1542 "[%s:%u] Lines of type '%c' don't take a %s field.",
1543 fname, line, action[0],
1544 description ? "GECOS" : home ? "home directory" : "login shell");
1545
1546 r = string_strv_ordered_hashmap_put(&members, resolved_id, resolved_name);
1547 if (r < 0)
1548 return log_error_errno(r, "Failed to store mapping for %s: %m", resolved_id);
1549
1550 return 0;
1551 }
1552
1553 case ADD_USER:
1554 if (!name)
1555 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1556 "[%s:%u] Lines of type 'u' require a user name in the second field.",
1557 fname, line);
1558
1559 r = ordered_hashmap_ensure_allocated(&users, &item_hash_ops);
1560 if (r < 0)
1561 return log_oom();
1562
1563 i = new0(Item, 1);
1564 if (!i)
1565 return log_oom();
1566
1567 if (resolved_id) {
1568 if (path_is_absolute(resolved_id)) {
1569 i->uid_path = TAKE_PTR(resolved_id);
1570 path_simplify(i->uid_path, false);
1571 } else {
1572 _cleanup_free_ char *uid = NULL, *gid = NULL;
1573 if (split_pair(resolved_id, ":", &uid, &gid) == 0) {
1574 r = parse_gid(gid, &i->gid);
1575 if (r < 0) {
1576 if (valid_user_group_name(gid, 0))
1577 i->group_name = TAKE_PTR(gid);
1578 else
1579 return log_error_errno(r, "Failed to parse GID: '%s': %m", id);
1580 } else {
1581 i->gid_set = true;
1582 i->id_set_strict = true;
1583 }
1584 free_and_replace(resolved_id, uid);
1585 }
1586 if (!streq(resolved_id, "-")) {
1587 r = parse_uid(resolved_id, &i->uid);
1588 if (r < 0)
1589 return log_error_errno(r, "Failed to parse UID: '%s': %m", id);
1590 i->uid_set = true;
1591 }
1592 }
1593 }
1594
1595 i->description = TAKE_PTR(resolved_description);
1596 i->home = TAKE_PTR(resolved_home);
1597 i->shell = TAKE_PTR(resolved_shell);
1598
1599 h = users;
1600 break;
1601
1602 case ADD_GROUP:
1603 if (!name)
1604 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1605 "[%s:%u] Lines of type 'g' require a user name in the second field.",
1606 fname, line);
1607
1608 if (description || home || shell)
1609 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1610 "[%s:%u] Lines of type '%c' don't take a %s field.",
1611 fname, line, action[0],
1612 description ? "GECOS" : home ? "home directory" : "login shell");
1613
1614 r = ordered_hashmap_ensure_allocated(&groups, &item_hash_ops);
1615 if (r < 0)
1616 return log_oom();
1617
1618 i = new0(Item, 1);
1619 if (!i)
1620 return log_oom();
1621
1622 if (resolved_id) {
1623 if (path_is_absolute(resolved_id)) {
1624 i->gid_path = TAKE_PTR(resolved_id);
1625 path_simplify(i->gid_path, false);
1626 } else {
1627 r = parse_gid(resolved_id, &i->gid);
1628 if (r < 0)
1629 return log_error_errno(r, "Failed to parse GID: '%s': %m", id);
1630
1631 i->gid_set = true;
1632 }
1633 }
1634
1635 h = groups;
1636 break;
1637
1638 default:
1639 return -EBADMSG;
1640 }
1641
1642 i->type = action[0];
1643 i->name = TAKE_PTR(resolved_name);
1644
1645 existing = ordered_hashmap_get(h, i->name);
1646 if (existing) {
1647 /* Two identical items are fine */
1648 if (!item_equal(existing, i))
1649 log_warning("Two or more conflicting lines for %s configured, ignoring.", i->name);
1650
1651 return 0;
1652 }
1653
1654 r = ordered_hashmap_put(h, i->name, i);
1655 if (r < 0)
1656 return log_oom();
1657
1658 i = NULL;
1659 return 0;
1660 }
1661
1662 static int read_config_file(const char *fn, bool ignore_enoent) {
1663 _cleanup_fclose_ FILE *rf = NULL;
1664 FILE *f = NULL;
1665 unsigned v = 0;
1666 int r = 0;
1667
1668 assert(fn);
1669
1670 if (streq(fn, "-"))
1671 f = stdin;
1672 else {
1673 r = search_and_fopen(fn, "re", arg_root, (const char**) CONF_PATHS_STRV("sysusers.d"), &rf);
1674 if (r < 0) {
1675 if (ignore_enoent && r == -ENOENT)
1676 return 0;
1677
1678 return log_error_errno(r, "Failed to open '%s', ignoring: %m", fn);
1679 }
1680
1681 f = rf;
1682 }
1683
1684 for (;;) {
1685 _cleanup_free_ char *line = NULL;
1686 char *l;
1687 int k;
1688
1689 k = read_line(f, LONG_LINE_MAX, &line);
1690 if (k < 0)
1691 return log_error_errno(k, "Failed to read '%s': %m", fn);
1692 if (k == 0)
1693 break;
1694
1695 v++;
1696
1697 l = strstrip(line);
1698 if (IN_SET(*l, 0, '#'))
1699 continue;
1700
1701 k = parse_line(fn, v, l);
1702 if (k < 0 && r == 0)
1703 r = k;
1704 }
1705
1706 if (ferror(f)) {
1707 log_error_errno(errno, "Failed to read from file %s: %m", fn);
1708 if (r == 0)
1709 r = -EIO;
1710 }
1711
1712 return r;
1713 }
1714
1715 static int cat_config(void) {
1716 _cleanup_strv_free_ char **files = NULL;
1717 int r;
1718
1719 r = conf_files_list_with_replacement(arg_root, CONF_PATHS_STRV("sysusers.d"), arg_replace, &files, NULL);
1720 if (r < 0)
1721 return r;
1722
1723 (void) pager_open(arg_pager_flags);
1724
1725 return cat_files(NULL, files, 0);
1726 }
1727
1728 static int help(void) {
1729 _cleanup_free_ char *link = NULL;
1730 int r;
1731
1732 r = terminal_urlify_man("systemd-sysusers.service", "8", &link);
1733 if (r < 0)
1734 return log_oom();
1735
1736 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
1737 "Creates system user accounts.\n\n"
1738 " -h --help Show this help\n"
1739 " --version Show package version\n"
1740 " --cat-config Show configuration files\n"
1741 " --root=PATH Operate on an alternate filesystem root\n"
1742 " --replace=PATH Treat arguments as replacement for PATH\n"
1743 " --inline Treat arguments as configuration lines\n"
1744 " --no-pager Do not pipe output into a pager\n"
1745 "\nSee the %s for details.\n"
1746 , program_invocation_short_name
1747 , link
1748 );
1749
1750 return 0;
1751 }
1752
1753 static int parse_argv(int argc, char *argv[]) {
1754
1755 enum {
1756 ARG_VERSION = 0x100,
1757 ARG_CAT_CONFIG,
1758 ARG_ROOT,
1759 ARG_REPLACE,
1760 ARG_INLINE,
1761 ARG_NO_PAGER,
1762 };
1763
1764 static const struct option options[] = {
1765 { "help", no_argument, NULL, 'h' },
1766 { "version", no_argument, NULL, ARG_VERSION },
1767 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
1768 { "root", required_argument, NULL, ARG_ROOT },
1769 { "replace", required_argument, NULL, ARG_REPLACE },
1770 { "inline", no_argument, NULL, ARG_INLINE },
1771 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
1772 {}
1773 };
1774
1775 int c, r;
1776
1777 assert(argc >= 0);
1778 assert(argv);
1779
1780 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
1781
1782 switch (c) {
1783
1784 case 'h':
1785 return help();
1786
1787 case ARG_VERSION:
1788 return version();
1789
1790 case ARG_CAT_CONFIG:
1791 arg_cat_config = true;
1792 break;
1793
1794 case ARG_ROOT:
1795 r = parse_path_argument_and_warn(optarg, /* suppress_root= */ false, &arg_root);
1796 if (r < 0)
1797 return r;
1798 break;
1799
1800 case ARG_REPLACE:
1801 if (!path_is_absolute(optarg) ||
1802 !endswith(optarg, ".conf"))
1803 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1804 "The argument to --replace= must an absolute path to a config file");
1805
1806 arg_replace = optarg;
1807 break;
1808
1809 case ARG_INLINE:
1810 arg_inline = true;
1811 break;
1812
1813 case ARG_NO_PAGER:
1814 arg_pager_flags |= PAGER_DISABLE;
1815 break;
1816
1817 case '?':
1818 return -EINVAL;
1819
1820 default:
1821 assert_not_reached("Unhandled option");
1822 }
1823
1824 if (arg_replace && arg_cat_config)
1825 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1826 "Option --replace= is not supported with --cat-config");
1827
1828 if (arg_replace && optind >= argc)
1829 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1830 "When --replace= is given, some configuration items must be specified");
1831
1832 return 1;
1833 }
1834
1835 static int parse_arguments(char **args) {
1836 char **arg;
1837 unsigned pos = 1;
1838 int r;
1839
1840 STRV_FOREACH(arg, args) {
1841 if (arg_inline)
1842 /* Use (argument):n, where n==1 for the first positional arg */
1843 r = parse_line("(argument)", pos, *arg);
1844 else
1845 r = read_config_file(*arg, false);
1846 if (r < 0)
1847 return r;
1848
1849 pos++;
1850 }
1851
1852 return 0;
1853 }
1854
1855 static int read_config_files(char **args) {
1856 _cleanup_strv_free_ char **files = NULL;
1857 _cleanup_free_ char *p = NULL;
1858 char **f;
1859 int r;
1860
1861 r = conf_files_list_with_replacement(arg_root, CONF_PATHS_STRV("sysusers.d"), arg_replace, &files, &p);
1862 if (r < 0)
1863 return r;
1864
1865 STRV_FOREACH(f, files)
1866 if (p && path_equal(*f, p)) {
1867 log_debug("Parsing arguments at position \"%s\"…", *f);
1868
1869 r = parse_arguments(args);
1870 if (r < 0)
1871 return r;
1872 } else {
1873 log_debug("Reading config file \"%s\"…", *f);
1874
1875 /* Just warn, ignore result otherwise */
1876 (void) read_config_file(*f, true);
1877 }
1878
1879 return 0;
1880 }
1881
1882 static int run(int argc, char *argv[]) {
1883 _cleanup_close_ int lock = -1;
1884 Iterator iterator;
1885 Item *i;
1886 int r;
1887
1888 r = parse_argv(argc, argv);
1889 if (r <= 0)
1890 return r;
1891
1892 log_setup_service();
1893
1894 if (arg_cat_config)
1895 return cat_config();
1896
1897 umask(0022);
1898
1899 r = mac_selinux_init();
1900 if (r < 0)
1901 return log_error_errno(r, "SELinux setup failed: %m");
1902
1903 /* If command line arguments are specified along with --replace, read all
1904 * configuration files and insert the positional arguments at the specified
1905 * place. Otherwise, if command line arguments are specified, execute just
1906 * them, and finally, without --replace= or any positional arguments, just
1907 * read configuration and execute it.
1908 */
1909 if (arg_replace || optind >= argc)
1910 r = read_config_files(argv + optind);
1911 else
1912 r = parse_arguments(argv + optind);
1913 if (r < 0)
1914 return r;
1915
1916 /* Let's tell nss-systemd not to synthesize the "root" and "nobody" entries for it, so that our detection
1917 * whether the names or UID/GID area already used otherwise doesn't get confused. After all, even though
1918 * nss-systemd synthesizes these users/groups, they should still appear in /etc/passwd and /etc/group, as the
1919 * synthesizing logic is merely supposed to be fallback for cases where we run with a completely unpopulated
1920 * /etc. */
1921 if (setenv("SYSTEMD_NSS_BYPASS_SYNTHETIC", "1", 1) < 0)
1922 return log_error_errno(errno, "Failed to set SYSTEMD_NSS_BYPASS_SYNTHETIC environment variable: %m");
1923
1924 if (!uid_range) {
1925 /* Default to default range of 1..SYSTEM_UID_MAX */
1926 r = uid_range_add(&uid_range, &n_uid_range, 1, SYSTEM_UID_MAX);
1927 if (r < 0)
1928 return log_oom();
1929 }
1930
1931 r = add_implicit();
1932 if (r < 0)
1933 return r;
1934
1935 lock = take_etc_passwd_lock(arg_root);
1936 if (lock < 0)
1937 return log_error_errno(lock, "Failed to take /etc/passwd lock: %m");
1938
1939 r = load_user_database();
1940 if (r < 0)
1941 return log_error_errno(r, "Failed to load user database: %m");
1942
1943 r = load_group_database();
1944 if (r < 0)
1945 return log_error_errno(r, "Failed to read group database: %m");
1946
1947 ORDERED_HASHMAP_FOREACH(i, groups, iterator)
1948 (void) process_item(i);
1949
1950 ORDERED_HASHMAP_FOREACH(i, users, iterator)
1951 (void) process_item(i);
1952
1953 r = write_files();
1954 if (r < 0)
1955 return log_error_errno(r, "Failed to write files: %m");
1956
1957 return 0;
1958 }
1959
1960 DEFINE_MAIN_FUNCTION(run);
Unnamed repository; edit this file 'description' to name the repository.