]> git.ipfire.org Git - thirdparty/systemd.git/blob - src/sysusers/sysusers.c
projects / thirdparty / systemd.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
license: LGPL-2.1+ -> LGPL-2.1-or-later
[thirdparty/systemd.git] / src / sysusers / sysusers.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
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 "dissect-image.h"
11 #include "fd-util.h"
12 #include "fileio.h"
13 #include "format-util.h"
14 #include "fs-util.h"
15 #include "hashmap.h"
16 #include "main-func.h"
17 #include "mount-util.h"
18 #include "pager.h"
19 #include "path-util.h"
20 #include "pretty-print.h"
21 #include "selinux-util.h"
22 #include "set.h"
23 #include "smack-util.h"
24 #include "specifier.h"
25 #include "string-util.h"
26 #include "strv.h"
27 #include "tmpfile-util-label.h"
28 #include "uid-range.h"
29 #include "user-record.h"
30 #include "user-util.h"
31 #include "utf8.h"
32 #include "util.h"
33
34 typedef enum ItemType {
35 ADD_USER = 'u',
36 ADD_GROUP = 'g',
37 ADD_MEMBER = 'm',
38 ADD_RANGE = 'r',
39 } ItemType;
40
41 typedef struct Item {
42 ItemType type;
43
44 char *name;
45 char *group_name;
46 char *uid_path;
47 char *gid_path;
48 char *description;
49 char *home;
50 char *shell;
51
52 gid_t gid;
53 uid_t uid;
54
55 bool gid_set:1;
56
57 /* When set the group with the specified gid must exist
58 * and the check if a uid clashes with the gid is skipped.
59 */
60 bool id_set_strict:1;
61
62 bool uid_set:1;
63
64 bool todo_user:1;
65 bool todo_group:1;
66 } Item;
67
68 static char *arg_root = NULL;
69 static char *arg_image = NULL;
70 static bool arg_cat_config = false;
71 static const char *arg_replace = NULL;
72 static bool arg_inline = false;
73 static PagerFlags arg_pager_flags = 0;
74
75 static OrderedHashmap *users = NULL, *groups = NULL;
76 static OrderedHashmap *todo_uids = NULL, *todo_gids = NULL;
77 static OrderedHashmap *members = NULL;
78
79 static Hashmap *database_by_uid = NULL, *database_by_username = NULL;
80 static Hashmap *database_by_gid = NULL, *database_by_groupname = NULL;
81 static Set *database_users = NULL, *database_groups = NULL;
82
83 static uid_t search_uid = UID_INVALID;
84 static UidRange *uid_range = NULL;
85 static unsigned n_uid_range = 0;
86
87 static UGIDAllocationRange login_defs = {};
88 static bool login_defs_need_warning = false;
89
90 STATIC_DESTRUCTOR_REGISTER(groups, ordered_hashmap_freep);
91 STATIC_DESTRUCTOR_REGISTER(users, ordered_hashmap_freep);
92 STATIC_DESTRUCTOR_REGISTER(members, ordered_hashmap_freep);
93 STATIC_DESTRUCTOR_REGISTER(todo_uids, ordered_hashmap_freep);
94 STATIC_DESTRUCTOR_REGISTER(todo_gids, ordered_hashmap_freep);
95 STATIC_DESTRUCTOR_REGISTER(database_by_uid, hashmap_freep);
96 STATIC_DESTRUCTOR_REGISTER(database_by_username, hashmap_freep);
97 STATIC_DESTRUCTOR_REGISTER(database_users, set_free_freep);
98 STATIC_DESTRUCTOR_REGISTER(database_by_gid, hashmap_freep);
99 STATIC_DESTRUCTOR_REGISTER(database_by_groupname, hashmap_freep);
100 STATIC_DESTRUCTOR_REGISTER(database_groups, set_free_freep);
101 STATIC_DESTRUCTOR_REGISTER(uid_range, freep);
102 STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
103 STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
104
105 static int errno_is_not_exists(int code) {
106 /* See getpwnam(3) and getgrnam(3): those codes and others can be returned if the user or group are
107 * not found. */
108 return IN_SET(code, 0, ENOENT, ESRCH, EBADF, EPERM);
109 }
110
111 static void maybe_emit_login_defs_warning(void) {
112 if (!login_defs_need_warning)
113 return;
114
115 if (login_defs.system_alloc_uid_min != SYSTEM_ALLOC_UID_MIN ||
116 login_defs.system_uid_max != SYSTEM_UID_MAX)
117 log_warning("login.defs specifies UID allocation range "UID_FMT"–"UID_FMT
118 " that is different than the built-in defaults ("UID_FMT"–"UID_FMT")",
119 login_defs.system_alloc_uid_min, login_defs.system_uid_max,
120 SYSTEM_ALLOC_UID_MIN, SYSTEM_UID_MAX);
121 if (login_defs.system_alloc_gid_min != SYSTEM_ALLOC_GID_MIN ||
122 login_defs.system_gid_max != SYSTEM_GID_MAX)
123 log_warning("login.defs specifies GID allocation range "GID_FMT"–"GID_FMT
124 " that is different than the built-in defaults ("GID_FMT"–"GID_FMT")",
125 login_defs.system_alloc_gid_min, login_defs.system_gid_max,
126 SYSTEM_ALLOC_GID_MIN, SYSTEM_GID_MAX);
127
128 login_defs_need_warning = false;
129 }
130
131 static int load_user_database(void) {
132 _cleanup_fclose_ FILE *f = NULL;
133 const char *passwd_path;
134 struct passwd *pw;
135 int r;
136
137 passwd_path = prefix_roota(arg_root, "/etc/passwd");
138 f = fopen(passwd_path, "re");
139 if (!f)
140 return errno == ENOENT ? 0 : -errno;
141
142 r = hashmap_ensure_allocated(&database_by_username, &string_hash_ops);
143 if (r < 0)
144 return r;
145
146 r = hashmap_ensure_allocated(&database_by_uid, NULL);
147 if (r < 0)
148 return r;
149
150 r = set_ensure_allocated(&database_users, NULL);
151 if (r < 0)
152 return r;
153
154 while ((r = fgetpwent_sane(f, &pw)) > 0) {
155 char *n;
156 int k, q;
157
158 n = strdup(pw->pw_name);
159 if (!n)
160 return -ENOMEM;
161
162 k = set_put(database_users, n);
163 if (k < 0) {
164 free(n);
165 return k;
166 }
167
168 k = hashmap_put(database_by_username, n, UID_TO_PTR(pw->pw_uid));
169 if (k < 0 && k != -EEXIST)
170 return k;
171
172 q = hashmap_put(database_by_uid, UID_TO_PTR(pw->pw_uid), n);
173 if (q < 0 && q != -EEXIST)
174 return q;
175 }
176 return r;
177 }
178
179 static int load_group_database(void) {
180 _cleanup_fclose_ FILE *f = NULL;
181 const char *group_path;
182 struct group *gr;
183 int r;
184
185 group_path = prefix_roota(arg_root, "/etc/group");
186 f = fopen(group_path, "re");
187 if (!f)
188 return errno == ENOENT ? 0 : -errno;
189
190 r = hashmap_ensure_allocated(&database_by_groupname, &string_hash_ops);
191 if (r < 0)
192 return r;
193
194 r = hashmap_ensure_allocated(&database_by_gid, NULL);
195 if (r < 0)
196 return r;
197
198 r = set_ensure_allocated(&database_groups, NULL);
199 if (r < 0)
200 return r;
201
202 while ((r = fgetgrent_sane(f, &gr)) > 0) {
203 char *n;
204 int k, q;
205
206 n = strdup(gr->gr_name);
207 if (!n)
208 return -ENOMEM;
209
210 k = set_put(database_groups, n);
211 if (k < 0) {
212 free(n);
213 return k;
214 }
215
216 k = hashmap_put(database_by_groupname, n, GID_TO_PTR(gr->gr_gid));
217 if (k < 0 && k != -EEXIST)
218 return k;
219
220 q = hashmap_put(database_by_gid, GID_TO_PTR(gr->gr_gid), n);
221 if (q < 0 && q != -EEXIST)
222 return q;
223 }
224 return r;
225 }
226
227 static int make_backup(const char *target, const char *x) {
228 _cleanup_(unlink_and_freep) char *dst_tmp = NULL;
229 _cleanup_fclose_ FILE *dst = NULL;
230 _cleanup_close_ int src = -1;
231 const char *backup;
232 struct stat st;
233 int r;
234
235 assert(target);
236 assert(x);
237
238 src = open(x, O_RDONLY|O_CLOEXEC|O_NOCTTY);
239 if (src < 0) {
240 if (errno == ENOENT) /* No backup necessary... */
241 return 0;
242
243 return -errno;
244 }
245
246 if (fstat(src, &st) < 0)
247 return -errno;
248
249 r = fopen_temporary_label(
250 target, /* The path for which to the lookup the label */
251 x, /* Where we want the file actually to end up */
252 &dst,
253 &dst_tmp /* The temporary file we write to */);
254 if (r < 0)
255 return r;
256
257 r = copy_bytes(src, fileno(dst), (uint64_t) -1, COPY_REFLINK);
258 if (r < 0)
259 return r;
260
261 backup = strjoina(x, "-");
262
263 /* Copy over the access mask. Don't fail on chmod() or chown(). If it stays owned by us and/or
264 * unreadable by others, then it isn't too bad... */
265 r = fchmod_and_chown(fileno(dst), st.st_mode & 07777, st.st_uid, st.st_gid);
266 if (r < 0)
267 log_warning_errno(r, "Failed to change access mode or ownership of %s: %m", backup);
268
269 if (futimens(fileno(dst), (const struct timespec[2]) { st.st_atim, st.st_mtim }) < 0)
270 log_warning_errno(errno, "Failed to fix access and modification time of %s: %m", backup);
271
272 r = fsync_full(fileno(dst));
273 if (r < 0)
274 return r;
275
276 if (rename(dst_tmp, backup) < 0)
277 return errno;
278
279 dst_tmp = mfree(dst_tmp); /* disable the unlink_and_freep() hook now that the file has been renamed*/
280 return 0;
281 }
282
283 static int putgrent_with_members(const struct group *gr, FILE *group) {
284 char **a;
285
286 assert(gr);
287 assert(group);
288
289 a = ordered_hashmap_get(members, gr->gr_name);
290 if (a) {
291 _cleanup_strv_free_ char **l = NULL;
292 bool added = false;
293 char **i;
294
295 l = strv_copy(gr->gr_mem);
296 if (!l)
297 return -ENOMEM;
298
299 STRV_FOREACH(i, a) {
300 if (strv_find(l, *i))
301 continue;
302
303 if (strv_extend(&l, *i) < 0)
304 return -ENOMEM;
305
306 added = true;
307 }
308
309 if (added) {
310 struct group t;
311 int r;
312
313 strv_uniq(l);
314 strv_sort(l);
315
316 t = *gr;
317 t.gr_mem = l;
318
319 r = putgrent_sane(&t, group);
320 return r < 0 ? r : 1;
321 }
322 }
323
324 return putgrent_sane(gr, group);
325 }
326
327 #if ENABLE_GSHADOW
328 static int putsgent_with_members(const struct sgrp *sg, FILE *gshadow) {
329 char **a;
330
331 assert(sg);
332 assert(gshadow);
333
334 a = ordered_hashmap_get(members, sg->sg_namp);
335 if (a) {
336 _cleanup_strv_free_ char **l = NULL;
337 bool added = false;
338 char **i;
339
340 l = strv_copy(sg->sg_mem);
341 if (!l)
342 return -ENOMEM;
343
344 STRV_FOREACH(i, a) {
345 if (strv_find(l, *i))
346 continue;
347
348 if (strv_extend(&l, *i) < 0)
349 return -ENOMEM;
350
351 added = true;
352 }
353
354 if (added) {
355 struct sgrp t;
356 int r;
357
358 strv_uniq(l);
359 strv_sort(l);
360
361 t = *sg;
362 t.sg_mem = l;
363
364 r = putsgent_sane(&t, gshadow);
365 return r < 0 ? r : 1;
366 }
367 }
368
369 return putsgent_sane(sg, gshadow);
370 }
371 #endif
372
373 static const char* default_shell(uid_t uid) {
374 return uid == 0 ? "/bin/sh" : NOLOGIN;
375 }
376
377 static int write_temporary_passwd(const char *passwd_path, FILE **tmpfile, char **tmpfile_path) {
378 _cleanup_fclose_ FILE *original = NULL, *passwd = NULL;
379 _cleanup_(unlink_and_freep) char *passwd_tmp = NULL;
380 struct passwd *pw = NULL;
381 Item *i;
382 int r;
383
384 if (ordered_hashmap_size(todo_uids) == 0)
385 return 0;
386
387 r = fopen_temporary_label("/etc/passwd", passwd_path, &passwd, &passwd_tmp);
388 if (r < 0)
389 return r;
390
391 original = fopen(passwd_path, "re");
392 if (original) {
393
394 r = sync_rights(fileno(original), fileno(passwd));
395 if (r < 0)
396 return r;
397
398 while ((r = fgetpwent_sane(original, &pw)) > 0) {
399
400 i = ordered_hashmap_get(users, pw->pw_name);
401 if (i && i->todo_user)
402 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
403 "%s: User \"%s\" already exists.",
404 passwd_path, pw->pw_name);
405
406 if (ordered_hashmap_contains(todo_uids, UID_TO_PTR(pw->pw_uid)))
407 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
408 "%s: Detected collision for UID " UID_FMT ".",
409 passwd_path, pw->pw_uid);
410
411 /* Make sure we keep the NIS entries (if any) at the end. */
412 if (IN_SET(pw->pw_name[0], '+', '-'))
413 break;
414
415 r = putpwent_sane(pw, passwd);
416 if (r < 0)
417 return r;
418 }
419 if (r < 0)
420 return r;
421
422 } else {
423 if (errno != ENOENT)
424 return -errno;
425 if (fchmod(fileno(passwd), 0644) < 0)
426 return -errno;
427 }
428
429 ORDERED_HASHMAP_FOREACH(i, todo_uids) {
430 struct passwd n = {
431 .pw_name = i->name,
432 .pw_uid = i->uid,
433 .pw_gid = i->gid,
434 .pw_gecos = i->description,
435
436 /* "x" means the password is stored in the shadow file */
437 .pw_passwd = (char*) "x",
438
439 /* We default to the root directory as home */
440 .pw_dir = i->home ?: (char*) "/",
441
442 /* Initialize the shell to nologin, with one exception:
443 * for root we patch in something special */
444 .pw_shell = i->shell ?: (char*) default_shell(i->uid),
445 };
446
447 r = putpwent_sane(&n, passwd);
448 if (r < 0)
449 return r;
450 }
451
452 /* Append the remaining NIS entries if any */
453 while (pw) {
454 r = putpwent_sane(pw, passwd);
455 if (r < 0)
456 return r;
457
458 r = fgetpwent_sane(original, &pw);
459 if (r < 0)
460 return r;
461 if (r == 0)
462 break;
463 }
464
465 r = fflush_and_check(passwd);
466 if (r < 0)
467 return r;
468
469 *tmpfile = TAKE_PTR(passwd);
470 *tmpfile_path = TAKE_PTR(passwd_tmp);
471
472 return 0;
473 }
474
475 static int write_temporary_shadow(const char *shadow_path, FILE **tmpfile, char **tmpfile_path) {
476 _cleanup_fclose_ FILE *original = NULL, *shadow = NULL;
477 _cleanup_(unlink_and_freep) char *shadow_tmp = NULL;
478 struct spwd *sp = NULL;
479 long lstchg;
480 Item *i;
481 int r;
482
483 if (ordered_hashmap_size(todo_uids) == 0)
484 return 0;
485
486 r = fopen_temporary_label("/etc/shadow", shadow_path, &shadow, &shadow_tmp);
487 if (r < 0)
488 return r;
489
490 lstchg = (long) (now(CLOCK_REALTIME) / USEC_PER_DAY);
491
492 original = fopen(shadow_path, "re");
493 if (original) {
494
495 r = sync_rights(fileno(original), fileno(shadow));
496 if (r < 0)
497 return r;
498
499 while ((r = fgetspent_sane(original, &sp)) > 0) {
500
501 i = ordered_hashmap_get(users, sp->sp_namp);
502 if (i && i->todo_user) {
503 /* we will update the existing entry */
504 sp->sp_lstchg = lstchg;
505
506 /* only the /etc/shadow stage is left, so we can
507 * safely remove the item from the todo set */
508 i->todo_user = false;
509 ordered_hashmap_remove(todo_uids, UID_TO_PTR(i->uid));
510 }
511
512 /* Make sure we keep the NIS entries (if any) at the end. */
513 if (IN_SET(sp->sp_namp[0], '+', '-'))
514 break;
515
516 r = putspent_sane(sp, shadow);
517 if (r < 0)
518 return r;
519 }
520 if (r < 0)
521 return r;
522
523 } else {
524 if (errno != ENOENT)
525 return -errno;
526 if (fchmod(fileno(shadow), 0000) < 0)
527 return -errno;
528 }
529
530 ORDERED_HASHMAP_FOREACH(i, todo_uids) {
531 struct spwd n = {
532 .sp_namp = i->name,
533 .sp_pwdp = (char*) "!*", /* lock this password, and make it invalid */
534 .sp_lstchg = lstchg,
535 .sp_min = -1,
536 .sp_max = -1,
537 .sp_warn = -1,
538 .sp_inact = -1,
539 .sp_expire = -1,
540 .sp_flag = (unsigned long) -1, /* this appears to be what everybody does ... */
541 };
542
543 r = putspent_sane(&n, shadow);
544 if (r < 0)
545 return r;
546 }
547
548 /* Append the remaining NIS entries if any */
549 while (sp) {
550 r = putspent_sane(sp, shadow);
551 if (r < 0)
552 return r;
553
554 r = fgetspent_sane(original, &sp);
555 if (r < 0)
556 return r;
557 if (r == 0)
558 break;
559 }
560 if (!IN_SET(errno, 0, ENOENT))
561 return -errno;
562
563 r = fflush_sync_and_check(shadow);
564 if (r < 0)
565 return r;
566
567 *tmpfile = TAKE_PTR(shadow);
568 *tmpfile_path = TAKE_PTR(shadow_tmp);
569
570 return 0;
571 }
572
573 static int write_temporary_group(const char *group_path, FILE **tmpfile, char **tmpfile_path) {
574 _cleanup_fclose_ FILE *original = NULL, *group = NULL;
575 _cleanup_(unlink_and_freep) char *group_tmp = NULL;
576 bool group_changed = false;
577 struct group *gr = NULL;
578 Item *i;
579 int r;
580
581 if (ordered_hashmap_size(todo_gids) == 0 && ordered_hashmap_size(members) == 0)
582 return 0;
583
584 r = fopen_temporary_label("/etc/group", group_path, &group, &group_tmp);
585 if (r < 0)
586 return r;
587
588 original = fopen(group_path, "re");
589 if (original) {
590
591 r = sync_rights(fileno(original), fileno(group));
592 if (r < 0)
593 return r;
594
595 while ((r = fgetgrent_sane(original, &gr)) > 0) {
596 /* Safety checks against name and GID collisions. Normally,
597 * this should be unnecessary, but given that we look at the
598 * entries anyway here, let's make an extra verification
599 * step that we don't generate duplicate entries. */
600
601 i = ordered_hashmap_get(groups, gr->gr_name);
602 if (i && i->todo_group)
603 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
604 "%s: Group \"%s\" already exists.",
605 group_path, gr->gr_name);
606
607 if (ordered_hashmap_contains(todo_gids, GID_TO_PTR(gr->gr_gid)))
608 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
609 "%s: Detected collision for GID " GID_FMT ".",
610 group_path, gr->gr_gid);
611
612 /* Make sure we keep the NIS entries (if any) at the end. */
613 if (IN_SET(gr->gr_name[0], '+', '-'))
614 break;
615
616 r = putgrent_with_members(gr, group);
617 if (r < 0)
618 return r;
619 if (r > 0)
620 group_changed = true;
621 }
622 if (r < 0)
623 return r;
624
625 } else {
626 if (errno != ENOENT)
627 return -errno;
628 if (fchmod(fileno(group), 0644) < 0)
629 return -errno;
630 }
631
632 ORDERED_HASHMAP_FOREACH(i, todo_gids) {
633 struct group n = {
634 .gr_name = i->name,
635 .gr_gid = i->gid,
636 .gr_passwd = (char*) "x",
637 };
638
639 r = putgrent_with_members(&n, group);
640 if (r < 0)
641 return r;
642
643 group_changed = true;
644 }
645
646 /* Append the remaining NIS entries if any */
647 while (gr) {
648 r = putgrent_sane(gr, group);
649 if (r < 0)
650 return r;
651
652 r = fgetgrent_sane(original, &gr);
653 if (r < 0)
654 return r;
655 if (r == 0)
656 break;
657 }
658
659 r = fflush_sync_and_check(group);
660 if (r < 0)
661 return r;
662
663 if (group_changed) {
664 *tmpfile = TAKE_PTR(group);
665 *tmpfile_path = TAKE_PTR(group_tmp);
666 }
667 return 0;
668 }
669
670 static int write_temporary_gshadow(const char * gshadow_path, FILE **tmpfile, char **tmpfile_path) {
671 #if ENABLE_GSHADOW
672 _cleanup_fclose_ FILE *original = NULL, *gshadow = NULL;
673 _cleanup_(unlink_and_freep) char *gshadow_tmp = NULL;
674 bool group_changed = false;
675 Item *i;
676 int r;
677
678 if (ordered_hashmap_size(todo_gids) == 0 && ordered_hashmap_size(members) == 0)
679 return 0;
680
681 r = fopen_temporary_label("/etc/gshadow", gshadow_path, &gshadow, &gshadow_tmp);
682 if (r < 0)
683 return r;
684
685 original = fopen(gshadow_path, "re");
686 if (original) {
687 struct sgrp *sg;
688
689 r = sync_rights(fileno(original), fileno(gshadow));
690 if (r < 0)
691 return r;
692
693 while ((r = fgetsgent_sane(original, &sg)) > 0) {
694
695 i = ordered_hashmap_get(groups, sg->sg_namp);
696 if (i && i->todo_group)
697 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
698 "%s: Group \"%s\" already exists.",
699 gshadow_path, sg->sg_namp);
700
701 r = putsgent_with_members(sg, gshadow);
702 if (r < 0)
703 return r;
704 if (r > 0)
705 group_changed = true;
706 }
707 if (r < 0)
708 return r;
709
710 } else {
711 if (errno != ENOENT)
712 return -errno;
713 if (fchmod(fileno(gshadow), 0000) < 0)
714 return -errno;
715 }
716
717 ORDERED_HASHMAP_FOREACH(i, todo_gids) {
718 struct sgrp n = {
719 .sg_namp = i->name,
720 .sg_passwd = (char*) "!*",
721 };
722
723 r = putsgent_with_members(&n, gshadow);
724 if (r < 0)
725 return r;
726
727 group_changed = true;
728 }
729
730 r = fflush_sync_and_check(gshadow);
731 if (r < 0)
732 return r;
733
734 if (group_changed) {
735 *tmpfile = TAKE_PTR(gshadow);
736 *tmpfile_path = TAKE_PTR(gshadow_tmp);
737 }
738 return 0;
739 #else
740 return 0;
741 #endif
742 }
743
744 static int write_files(void) {
745 _cleanup_fclose_ FILE *passwd = NULL, *group = NULL, *shadow = NULL, *gshadow = NULL;
746 _cleanup_(unlink_and_freep) char *passwd_tmp = NULL, *group_tmp = NULL, *shadow_tmp = NULL, *gshadow_tmp = NULL;
747 const char *passwd_path = NULL, *group_path = NULL, *shadow_path = NULL, *gshadow_path = NULL;
748 int r;
749
750 passwd_path = prefix_roota(arg_root, "/etc/passwd");
751 shadow_path = prefix_roota(arg_root, "/etc/shadow");
752 group_path = prefix_roota(arg_root, "/etc/group");
753 gshadow_path = prefix_roota(arg_root, "/etc/gshadow");
754
755 r = write_temporary_group(group_path, &group, &group_tmp);
756 if (r < 0)
757 return r;
758
759 r = write_temporary_gshadow(gshadow_path, &gshadow, &gshadow_tmp);
760 if (r < 0)
761 return r;
762
763 r = write_temporary_passwd(passwd_path, &passwd, &passwd_tmp);
764 if (r < 0)
765 return r;
766
767 r = write_temporary_shadow(shadow_path, &shadow, &shadow_tmp);
768 if (r < 0)
769 return r;
770
771 /* Make a backup of the old files */
772 if (group) {
773 r = make_backup("/etc/group", group_path);
774 if (r < 0)
775 return r;
776 }
777 if (gshadow) {
778 r = make_backup("/etc/gshadow", gshadow_path);
779 if (r < 0)
780 return r;
781 }
782
783 if (passwd) {
784 r = make_backup("/etc/passwd", passwd_path);
785 if (r < 0)
786 return r;
787 }
788 if (shadow) {
789 r = make_backup("/etc/shadow", shadow_path);
790 if (r < 0)
791 return r;
792 }
793
794 /* And make the new files count */
795 if (group) {
796 r = rename_and_apply_smack_floor_label(group_tmp, group_path);
797 if (r < 0)
798 return r;
799
800 group_tmp = mfree(group_tmp);
801 }
802 if (gshadow) {
803 r = rename_and_apply_smack_floor_label(gshadow_tmp, gshadow_path);
804 if (r < 0)
805 return r;
806
807 gshadow_tmp = mfree(gshadow_tmp);
808 }
809
810 if (passwd) {
811 r = rename_and_apply_smack_floor_label(passwd_tmp, passwd_path);
812 if (r < 0)
813 return r;
814
815 passwd_tmp = mfree(passwd_tmp);
816 }
817 if (shadow) {
818 r = rename_and_apply_smack_floor_label(shadow_tmp, shadow_path);
819 if (r < 0)
820 return r;
821
822 shadow_tmp = mfree(shadow_tmp);
823 }
824
825 return 0;
826 }
827
828 static int uid_is_ok(uid_t uid, const char *name, bool check_with_gid) {
829 struct passwd *p;
830 struct group *g;
831 const char *n;
832 Item *i;
833
834 /* Let's see if we already have assigned the UID a second time */
835 if (ordered_hashmap_get(todo_uids, UID_TO_PTR(uid)))
836 return 0;
837
838 /* Try to avoid using uids that are already used by a group
839 * that doesn't have the same name as our new user. */
840 if (check_with_gid) {
841 i = ordered_hashmap_get(todo_gids, GID_TO_PTR(uid));
842 if (i && !streq(i->name, name))
843 return 0;
844 }
845
846 /* Let's check the files directly */
847 if (hashmap_contains(database_by_uid, UID_TO_PTR(uid)))
848 return 0;
849
850 if (check_with_gid) {
851 n = hashmap_get(database_by_gid, GID_TO_PTR(uid));
852 if (n && !streq(n, name))
853 return 0;
854 }
855
856 /* Let's also check via NSS, to avoid UID clashes over LDAP and such, just in case */
857 if (!arg_root) {
858 errno = 0;
859 p = getpwuid(uid);
860 if (p)
861 return 0;
862 if (!IN_SET(errno, 0, ENOENT))
863 return -errno;
864
865 if (check_with_gid) {
866 errno = 0;
867 g = getgrgid((gid_t) uid);
868 if (g) {
869 if (!streq(g->gr_name, name))
870 return 0;
871 } else if (!IN_SET(errno, 0, ENOENT))
872 return -errno;
873 }
874 }
875
876 return 1;
877 }
878
879 static int root_stat(const char *p, struct stat *st) {
880 const char *fix;
881
882 fix = prefix_roota(arg_root, p);
883 if (stat(fix, st) < 0)
884 return -errno;
885
886 return 0;
887 }
888
889 static int read_id_from_file(Item *i, uid_t *_uid, gid_t *_gid) {
890 struct stat st;
891 bool found_uid = false, found_gid = false;
892 uid_t uid = 0;
893 gid_t gid = 0;
894
895 assert(i);
896
897 /* First, try to get the gid directly */
898 if (_gid && i->gid_path && root_stat(i->gid_path, &st) >= 0) {
899 gid = st.st_gid;
900 found_gid = true;
901 }
902
903 /* Then, try to get the uid directly */
904 if ((_uid || (_gid && !found_gid))
905 && i->uid_path
906 && root_stat(i->uid_path, &st) >= 0) {
907
908 uid = st.st_uid;
909 found_uid = true;
910
911 /* If we need the gid, but had no success yet, also derive it from the uid path */
912 if (_gid && !found_gid) {
913 gid = st.st_gid;
914 found_gid = true;
915 }
916 }
917
918 /* If that didn't work yet, then let's reuse the gid as uid */
919 if (_uid && !found_uid && i->gid_path) {
920
921 if (found_gid) {
922 uid = (uid_t) gid;
923 found_uid = true;
924 } else if (root_stat(i->gid_path, &st) >= 0) {
925 uid = (uid_t) st.st_gid;
926 found_uid = true;
927 }
928 }
929
930 if (_uid) {
931 if (!found_uid)
932 return 0;
933
934 *_uid = uid;
935 }
936
937 if (_gid) {
938 if (!found_gid)
939 return 0;
940
941 *_gid = gid;
942 }
943
944 return 1;
945 }
946
947 static int add_user(Item *i) {
948 void *z;
949 int r;
950
951 assert(i);
952
953 /* Check the database directly */
954 z = hashmap_get(database_by_username, i->name);
955 if (z) {
956 log_debug("User %s already exists.", i->name);
957 i->uid = PTR_TO_UID(z);
958 i->uid_set = true;
959 return 0;
960 }
961
962 if (!arg_root) {
963 struct passwd *p;
964
965 /* Also check NSS */
966 errno = 0;
967 p = getpwnam(i->name);
968 if (p) {
969 log_debug("User %s already exists.", i->name);
970 i->uid = p->pw_uid;
971 i->uid_set = true;
972
973 r = free_and_strdup(&i->description, p->pw_gecos);
974 if (r < 0)
975 return log_oom();
976
977 return 0;
978 }
979 if (!errno_is_not_exists(errno))
980 return log_error_errno(errno, "Failed to check if user %s already exists: %m", i->name);
981 }
982
983 /* Try to use the suggested numeric uid */
984 if (i->uid_set) {
985 r = uid_is_ok(i->uid, i->name, !i->id_set_strict);
986 if (r < 0)
987 return log_error_errno(r, "Failed to verify uid " UID_FMT ": %m", i->uid);
988 if (r == 0) {
989 log_debug("Suggested user ID " UID_FMT " for %s already used.", i->uid, i->name);
990 i->uid_set = false;
991 }
992 }
993
994 /* If that didn't work, try to read it from the specified path */
995 if (!i->uid_set) {
996 uid_t c;
997
998 if (read_id_from_file(i, &c, NULL) > 0) {
999
1000 if (c <= 0 || !uid_range_contains(uid_range, n_uid_range, c))
1001 log_debug("User ID " UID_FMT " of file not suitable for %s.", c, i->name);
1002 else {
1003 r = uid_is_ok(c, i->name, true);
1004 if (r < 0)
1005 return log_error_errno(r, "Failed to verify uid " UID_FMT ": %m", i->uid);
1006 else if (r > 0) {
1007 i->uid = c;
1008 i->uid_set = true;
1009 } else
1010 log_debug("User ID " UID_FMT " of file for %s is already used.", c, i->name);
1011 }
1012 }
1013 }
1014
1015 /* Otherwise, try to reuse the group ID */
1016 if (!i->uid_set && i->gid_set) {
1017 r = uid_is_ok((uid_t) i->gid, i->name, true);
1018 if (r < 0)
1019 return log_error_errno(r, "Failed to verify uid " UID_FMT ": %m", i->uid);
1020 if (r > 0) {
1021 i->uid = (uid_t) i->gid;
1022 i->uid_set = true;
1023 }
1024 }
1025
1026 /* And if that didn't work either, let's try to find a free one */
1027 if (!i->uid_set) {
1028 maybe_emit_login_defs_warning();
1029
1030 for (;;) {
1031 r = uid_range_next_lower(uid_range, n_uid_range, &search_uid);
1032 if (r < 0)
1033 return log_error_errno(r, "No free user ID available for %s.", i->name);
1034
1035 r = uid_is_ok(search_uid, i->name, true);
1036 if (r < 0)
1037 return log_error_errno(r, "Failed to verify uid " UID_FMT ": %m", i->uid);
1038 else if (r > 0)
1039 break;
1040 }
1041
1042 i->uid_set = true;
1043 i->uid = search_uid;
1044 }
1045
1046 r = ordered_hashmap_ensure_allocated(&todo_uids, NULL);
1047 if (r < 0)
1048 return log_oom();
1049
1050 r = ordered_hashmap_put(todo_uids, UID_TO_PTR(i->uid), i);
1051 if (r < 0)
1052 return log_oom();
1053
1054 i->todo_user = true;
1055 log_info("Creating user %s (%s) with uid " UID_FMT " and gid " GID_FMT ".", i->name, strna(i->description), i->uid, i->gid);
1056
1057 return 0;
1058 }
1059
1060 static int gid_is_ok(gid_t gid) {
1061 struct group *g;
1062 struct passwd *p;
1063
1064 if (ordered_hashmap_get(todo_gids, GID_TO_PTR(gid)))
1065 return 0;
1066
1067 /* Avoid reusing gids that are already used by a different user */
1068 if (ordered_hashmap_get(todo_uids, UID_TO_PTR(gid)))
1069 return 0;
1070
1071 if (hashmap_contains(database_by_gid, GID_TO_PTR(gid)))
1072 return 0;
1073
1074 if (hashmap_contains(database_by_uid, UID_TO_PTR(gid)))
1075 return 0;
1076
1077 if (!arg_root) {
1078 errno = 0;
1079 g = getgrgid(gid);
1080 if (g)
1081 return 0;
1082 if (!IN_SET(errno, 0, ENOENT))
1083 return -errno;
1084
1085 errno = 0;
1086 p = getpwuid((uid_t) gid);
1087 if (p)
1088 return 0;
1089 if (!IN_SET(errno, 0, ENOENT))
1090 return -errno;
1091 }
1092
1093 return 1;
1094 }
1095
1096 static int get_gid_by_name(const char *name, gid_t *gid) {
1097 void *z;
1098
1099 assert(gid);
1100
1101 /* Check the database directly */
1102 z = hashmap_get(database_by_groupname, name);
1103 if (z) {
1104 *gid = PTR_TO_GID(z);
1105 return 0;
1106 }
1107
1108 /* Also check NSS */
1109 if (!arg_root) {
1110 struct group *g;
1111
1112 errno = 0;
1113 g = getgrnam(name);
1114 if (g) {
1115 *gid = g->gr_gid;
1116 return 0;
1117 }
1118 if (!errno_is_not_exists(errno))
1119 return log_error_errno(errno, "Failed to check if group %s already exists: %m", name);
1120 }
1121
1122 return -ENOENT;
1123 }
1124
1125 static int add_group(Item *i) {
1126 int r;
1127
1128 assert(i);
1129
1130 r = get_gid_by_name(i->name, &i->gid);
1131 if (r != -ENOENT) {
1132 if (r < 0)
1133 return r;
1134 log_debug("Group %s already exists.", i->name);
1135 i->gid_set = true;
1136 return 0;
1137 }
1138
1139 /* Try to use the suggested numeric gid */
1140 if (i->gid_set) {
1141 r = gid_is_ok(i->gid);
1142 if (r < 0)
1143 return log_error_errno(r, "Failed to verify gid " GID_FMT ": %m", i->gid);
1144 if (i->id_set_strict) {
1145 /* If we require the gid to already exist we can return here:
1146 * r > 0: means the gid does not exist -> fail
1147 * r == 0: means the gid exists -> nothing more to do.
1148 */
1149 if (r > 0)
1150 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1151 "Failed to create %s: please create GID %d",
1152 i->name, i->gid);
1153 if (r == 0)
1154 return 0;
1155 }
1156 if (r == 0) {
1157 log_debug("Suggested group ID " GID_FMT " for %s already used.", i->gid, i->name);
1158 i->gid_set = false;
1159 }
1160 }
1161
1162 /* Try to reuse the numeric uid, if there's one */
1163 if (!i->gid_set && i->uid_set) {
1164 r = gid_is_ok((gid_t) i->uid);
1165 if (r < 0)
1166 return log_error_errno(r, "Failed to verify gid " GID_FMT ": %m", i->gid);
1167 if (r > 0) {
1168 i->gid = (gid_t) i->uid;
1169 i->gid_set = true;
1170 }
1171 }
1172
1173 /* If that didn't work, try to read it from the specified path */
1174 if (!i->gid_set) {
1175 gid_t c;
1176
1177 if (read_id_from_file(i, NULL, &c) > 0) {
1178
1179 if (c <= 0 || !uid_range_contains(uid_range, n_uid_range, c))
1180 log_debug("Group ID " GID_FMT " of file not suitable for %s.", c, i->name);
1181 else {
1182 r = gid_is_ok(c);
1183 if (r < 0)
1184 return log_error_errno(r, "Failed to verify gid " GID_FMT ": %m", i->gid);
1185 else if (r > 0) {
1186 i->gid = c;
1187 i->gid_set = true;
1188 } else
1189 log_debug("Group ID " GID_FMT " of file for %s already used.", c, i->name);
1190 }
1191 }
1192 }
1193
1194 /* And if that didn't work either, let's try to find a free one */
1195 if (!i->gid_set) {
1196 maybe_emit_login_defs_warning();
1197
1198 for (;;) {
1199 /* We look for new GIDs in the UID pool! */
1200 r = uid_range_next_lower(uid_range, n_uid_range, &search_uid);
1201 if (r < 0)
1202 return log_error_errno(r, "No free group ID available for %s.", i->name);
1203
1204 r = gid_is_ok(search_uid);
1205 if (r < 0)
1206 return log_error_errno(r, "Failed to verify gid " GID_FMT ": %m", i->gid);
1207 else if (r > 0)
1208 break;
1209 }
1210
1211 i->gid_set = true;
1212 i->gid = search_uid;
1213 }
1214
1215 r = ordered_hashmap_ensure_allocated(&todo_gids, NULL);
1216 if (r < 0)
1217 return log_oom();
1218
1219 r = ordered_hashmap_put(todo_gids, GID_TO_PTR(i->gid), i);
1220 if (r < 0)
1221 return log_oom();
1222
1223 i->todo_group = true;
1224 log_info("Creating group %s with gid " GID_FMT ".", i->name, i->gid);
1225
1226 return 0;
1227 }
1228
1229 static int process_item(Item *i) {
1230 int r;
1231
1232 assert(i);
1233
1234 switch (i->type) {
1235
1236 case ADD_USER: {
1237 Item *j;
1238
1239 j = ordered_hashmap_get(groups, i->group_name ?: i->name);
1240 if (j && j->todo_group) {
1241 /* When a group with the target name is already in queue,
1242 * use the information about the group and do not create
1243 * duplicated group entry. */
1244 i->gid_set = j->gid_set;
1245 i->gid = j->gid;
1246 i->id_set_strict = true;
1247 } else if (i->group_name) {
1248 /* When a group name was given instead of a GID and it's
1249 * not in queue, then it must already exist. */
1250 r = get_gid_by_name(i->group_name, &i->gid);
1251 if (r < 0)
1252 return log_error_errno(r, "Group %s not found.", i->group_name);
1253 i->gid_set = true;
1254 i->id_set_strict = true;
1255 } else {
1256 r = add_group(i);
1257 if (r < 0)
1258 return r;
1259 }
1260
1261 return add_user(i);
1262 }
1263
1264 case ADD_GROUP:
1265 return add_group(i);
1266
1267 default:
1268 assert_not_reached("Unknown item type");
1269 }
1270 }
1271
1272 static Item* item_free(Item *i) {
1273 if (!i)
1274 return NULL;
1275
1276 free(i->name);
1277 free(i->group_name);
1278 free(i->uid_path);
1279 free(i->gid_path);
1280 free(i->description);
1281 free(i->home);
1282 free(i->shell);
1283 return mfree(i);
1284 }
1285
1286 DEFINE_TRIVIAL_CLEANUP_FUNC(Item*, item_free);
1287 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_hash_ops, char, string_hash_func, string_compare_func, Item, item_free);
1288
1289 static int add_implicit(void) {
1290 char *g, **l;
1291 int r;
1292
1293 /* Implicitly create additional users and groups, if they were listed in "m" lines */
1294 ORDERED_HASHMAP_FOREACH_KEY(l, g, members) {
1295 char **m;
1296
1297 STRV_FOREACH(m, l)
1298 if (!ordered_hashmap_get(users, *m)) {
1299 _cleanup_(item_freep) Item *j = NULL;
1300
1301 r = ordered_hashmap_ensure_allocated(&users, &item_hash_ops);
1302 if (r < 0)
1303 return log_oom();
1304
1305 j = new0(Item, 1);
1306 if (!j)
1307 return log_oom();
1308
1309 j->type = ADD_USER;
1310 j->name = strdup(*m);
1311 if (!j->name)
1312 return log_oom();
1313
1314 r = ordered_hashmap_put(users, j->name, j);
1315 if (r < 0)
1316 return log_oom();
1317
1318 log_debug("Adding implicit user '%s' due to m line", j->name);
1319 j = NULL;
1320 }
1321
1322 if (!(ordered_hashmap_get(users, g) ||
1323 ordered_hashmap_get(groups, g))) {
1324 _cleanup_(item_freep) Item *j = NULL;
1325
1326 r = ordered_hashmap_ensure_allocated(&groups, &item_hash_ops);
1327 if (r < 0)
1328 return log_oom();
1329
1330 j = new0(Item, 1);
1331 if (!j)
1332 return log_oom();
1333
1334 j->type = ADD_GROUP;
1335 j->name = strdup(g);
1336 if (!j->name)
1337 return log_oom();
1338
1339 r = ordered_hashmap_put(groups, j->name, j);
1340 if (r < 0)
1341 return log_oom();
1342
1343 log_debug("Adding implicit group '%s' due to m line", j->name);
1344 j = NULL;
1345 }
1346 }
1347
1348 return 0;
1349 }
1350
1351 static bool item_equal(Item *a, Item *b) {
1352 assert(a);
1353 assert(b);
1354
1355 if (a->type != b->type)
1356 return false;
1357
1358 if (!streq_ptr(a->name, b->name))
1359 return false;
1360
1361 if (!streq_ptr(a->uid_path, b->uid_path))
1362 return false;
1363
1364 if (!streq_ptr(a->gid_path, b->gid_path))
1365 return false;
1366
1367 if (!streq_ptr(a->description, b->description))
1368 return false;
1369
1370 if (a->uid_set != b->uid_set)
1371 return false;
1372
1373 if (a->uid_set && a->uid != b->uid)
1374 return false;
1375
1376 if (a->gid_set != b->gid_set)
1377 return false;
1378
1379 if (a->gid_set && a->gid != b->gid)
1380 return false;
1381
1382 if (!streq_ptr(a->home, b->home))
1383 return false;
1384
1385 if (!streq_ptr(a->shell, b->shell))
1386 return false;
1387
1388 return true;
1389 }
1390
1391 static int parse_line(const char *fname, unsigned line, const char *buffer) {
1392
1393 static const Specifier specifier_table[] = {
1394 { 'm', specifier_machine_id, NULL },
1395 { 'b', specifier_boot_id, NULL },
1396 { 'H', specifier_host_name, NULL },
1397 { 'l', specifier_short_host_name, NULL },
1398 { 'v', specifier_kernel_release, NULL },
1399 { 'a', specifier_architecture, NULL },
1400 { 'o', specifier_os_id, NULL },
1401 { 'w', specifier_os_version_id, NULL },
1402 { 'B', specifier_os_build_id, NULL },
1403 { 'W', specifier_os_variant_id, NULL },
1404 { 'T', specifier_tmp_dir, NULL },
1405 { 'V', specifier_var_tmp_dir, NULL },
1406 {}
1407 };
1408
1409 _cleanup_free_ char *action = NULL,
1410 *name = NULL, *resolved_name = NULL,
1411 *id = NULL, *resolved_id = NULL,
1412 *description = NULL, *resolved_description = NULL,
1413 *home = NULL, *resolved_home = NULL,
1414 *shell = NULL, *resolved_shell = NULL;
1415 _cleanup_(item_freep) Item *i = NULL;
1416 Item *existing;
1417 OrderedHashmap *h;
1418 int r;
1419 const char *p;
1420
1421 assert(fname);
1422 assert(line >= 1);
1423 assert(buffer);
1424
1425 /* Parse columns */
1426 p = buffer;
1427 r = extract_many_words(&p, NULL, EXTRACT_UNQUOTE,
1428 &action, &name, &id, &description, &home, &shell, NULL);
1429 if (r < 0)
1430 return log_error_errno(r, "[%s:%u] Syntax error.", fname, line);
1431 if (r < 2)
1432 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1433 "[%s:%u] Missing action and name columns.", fname, line);
1434 if (!isempty(p))
1435 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1436 "[%s:%u] Trailing garbage.", fname, line);
1437
1438 /* Verify action */
1439 if (strlen(action) != 1)
1440 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1441 "[%s:%u] Unknown modifier '%s'", fname, line, action);
1442
1443 if (!IN_SET(action[0], ADD_USER, ADD_GROUP, ADD_MEMBER, ADD_RANGE))
1444 return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
1445 "[%s:%u] Unknown command type '%c'.", fname, line, action[0]);
1446
1447 /* Verify name */
1448 if (empty_or_dash(name))
1449 name = mfree(name);
1450
1451 if (name) {
1452 r = specifier_printf(name, specifier_table, NULL, &resolved_name);
1453 if (r < 0)
1454 return log_error_errno(r, "[%s:%u] Failed to replace specifiers in '%s': %m", fname, line, name);
1455
1456 if (!valid_user_group_name(resolved_name, 0))
1457 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1458 "[%s:%u] '%s' is not a valid user or group name.",
1459 fname, line, resolved_name);
1460 }
1461
1462 /* Verify id */
1463 if (empty_or_dash(id))
1464 id = mfree(id);
1465
1466 if (id) {
1467 r = specifier_printf(id, specifier_table, NULL, &resolved_id);
1468 if (r < 0)
1469 return log_error_errno(r, "[%s:%u] Failed to replace specifiers in '%s': %m",
1470 fname, line, name);
1471 }
1472
1473 /* Verify description */
1474 if (empty_or_dash(description))
1475 description = mfree(description);
1476
1477 if (description) {
1478 r = specifier_printf(description, specifier_table, NULL, &resolved_description);
1479 if (r < 0)
1480 return log_error_errno(r, "[%s:%u] Failed to replace specifiers in '%s': %m",
1481 fname, line, description);
1482
1483 if (!valid_gecos(resolved_description))
1484 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1485 "[%s:%u] '%s' is not a valid GECOS field.",
1486 fname, line, resolved_description);
1487 }
1488
1489 /* Verify home */
1490 if (empty_or_dash(home))
1491 home = mfree(home);
1492
1493 if (home) {
1494 r = specifier_printf(home, specifier_table, NULL, &resolved_home);
1495 if (r < 0)
1496 return log_error_errno(r, "[%s:%u] Failed to replace specifiers in '%s': %m",
1497 fname, line, home);
1498
1499 if (!valid_home(resolved_home))
1500 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1501 "[%s:%u] '%s' is not a valid home directory field.",
1502 fname, line, resolved_home);
1503 }
1504
1505 /* Verify shell */
1506 if (empty_or_dash(shell))
1507 shell = mfree(shell);
1508
1509 if (shell) {
1510 r = specifier_printf(shell, specifier_table, NULL, &resolved_shell);
1511 if (r < 0)
1512 return log_error_errno(r, "[%s:%u] Failed to replace specifiers in '%s': %m",
1513 fname, line, shell);
1514
1515 if (!valid_shell(resolved_shell))
1516 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1517 "[%s:%u] '%s' is not a valid login shell field.",
1518 fname, line, resolved_shell);
1519 }
1520
1521 switch (action[0]) {
1522
1523 case ADD_RANGE:
1524 if (resolved_name)
1525 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1526 "[%s:%u] Lines of type 'r' don't take a name field.",
1527 fname, line);
1528
1529 if (!resolved_id)
1530 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1531 "[%s:%u] Lines of type 'r' require a ID range in the third field.",
1532 fname, line);
1533
1534 if (description || home || shell)
1535 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1536 "[%s:%u] Lines of type '%c' don't take a %s field.",
1537 fname, line, action[0],
1538 description ? "GECOS" : home ? "home directory" : "login shell");
1539
1540 r = uid_range_add_str(&uid_range, &n_uid_range, resolved_id);
1541 if (r < 0)
1542 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1543 "[%s:%u] Invalid UID range %s.", fname, line, resolved_id);
1544
1545 return 0;
1546
1547 case ADD_MEMBER: {
1548 /* Try to extend an existing member or group item */
1549 if (!name)
1550 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1551 "[%s:%u] Lines of type 'm' require a user name in the second field.",
1552 fname, line);
1553
1554 if (!resolved_id)
1555 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1556 "[%s:%u] Lines of type 'm' require a group name in the third field.",
1557 fname, line);
1558
1559 if (!valid_user_group_name(resolved_id, 0))
1560 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1561 "[%s:%u] '%s' is not a valid user or group name.",
1562 fname, line, resolved_id);
1563
1564 if (description || home || shell)
1565 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1566 "[%s:%u] Lines of type '%c' don't take a %s field.",
1567 fname, line, action[0],
1568 description ? "GECOS" : home ? "home directory" : "login shell");
1569
1570 r = string_strv_ordered_hashmap_put(&members, resolved_id, resolved_name);
1571 if (r < 0)
1572 return log_error_errno(r, "Failed to store mapping for %s: %m", resolved_id);
1573
1574 return 0;
1575 }
1576
1577 case ADD_USER:
1578 if (!name)
1579 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1580 "[%s:%u] Lines of type 'u' require a user name in the second field.",
1581 fname, line);
1582
1583 r = ordered_hashmap_ensure_allocated(&users, &item_hash_ops);
1584 if (r < 0)
1585 return log_oom();
1586
1587 i = new0(Item, 1);
1588 if (!i)
1589 return log_oom();
1590
1591 if (resolved_id) {
1592 if (path_is_absolute(resolved_id)) {
1593 i->uid_path = TAKE_PTR(resolved_id);
1594 path_simplify(i->uid_path, false);
1595 } else {
1596 _cleanup_free_ char *uid = NULL, *gid = NULL;
1597 if (split_pair(resolved_id, ":", &uid, &gid) == 0) {
1598 r = parse_gid(gid, &i->gid);
1599 if (r < 0) {
1600 if (valid_user_group_name(gid, 0))
1601 i->group_name = TAKE_PTR(gid);
1602 else
1603 return log_error_errno(r, "Failed to parse GID: '%s': %m", id);
1604 } else {
1605 i->gid_set = true;
1606 i->id_set_strict = true;
1607 }
1608 free_and_replace(resolved_id, uid);
1609 }
1610 if (!streq(resolved_id, "-")) {
1611 r = parse_uid(resolved_id, &i->uid);
1612 if (r < 0)
1613 return log_error_errno(r, "Failed to parse UID: '%s': %m", id);
1614 i->uid_set = true;
1615 }
1616 }
1617 }
1618
1619 i->description = TAKE_PTR(resolved_description);
1620 i->home = TAKE_PTR(resolved_home);
1621 i->shell = TAKE_PTR(resolved_shell);
1622
1623 h = users;
1624 break;
1625
1626 case ADD_GROUP:
1627 if (!name)
1628 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1629 "[%s:%u] Lines of type 'g' require a user name in the second field.",
1630 fname, line);
1631
1632 if (description || home || shell)
1633 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1634 "[%s:%u] Lines of type '%c' don't take a %s field.",
1635 fname, line, action[0],
1636 description ? "GECOS" : home ? "home directory" : "login shell");
1637
1638 r = ordered_hashmap_ensure_allocated(&groups, &item_hash_ops);
1639 if (r < 0)
1640 return log_oom();
1641
1642 i = new0(Item, 1);
1643 if (!i)
1644 return log_oom();
1645
1646 if (resolved_id) {
1647 if (path_is_absolute(resolved_id)) {
1648 i->gid_path = TAKE_PTR(resolved_id);
1649 path_simplify(i->gid_path, false);
1650 } else {
1651 r = parse_gid(resolved_id, &i->gid);
1652 if (r < 0)
1653 return log_error_errno(r, "Failed to parse GID: '%s': %m", id);
1654
1655 i->gid_set = true;
1656 }
1657 }
1658
1659 h = groups;
1660 break;
1661
1662 default:
1663 return -EBADMSG;
1664 }
1665
1666 i->type = action[0];
1667 i->name = TAKE_PTR(resolved_name);
1668
1669 existing = ordered_hashmap_get(h, i->name);
1670 if (existing) {
1671 /* Two identical items are fine */
1672 if (!item_equal(existing, i))
1673 log_warning("Two or more conflicting lines for %s configured, ignoring.", i->name);
1674
1675 return 0;
1676 }
1677
1678 r = ordered_hashmap_put(h, i->name, i);
1679 if (r < 0)
1680 return log_oom();
1681
1682 i = NULL;
1683 return 0;
1684 }
1685
1686 static int read_config_file(const char *fn, bool ignore_enoent) {
1687 _cleanup_fclose_ FILE *rf = NULL;
1688 FILE *f = NULL;
1689 unsigned v = 0;
1690 int r = 0;
1691
1692 assert(fn);
1693
1694 if (streq(fn, "-"))
1695 f = stdin;
1696 else {
1697 r = search_and_fopen(fn, "re", arg_root, (const char**) CONF_PATHS_STRV("sysusers.d"), &rf);
1698 if (r < 0) {
1699 if (ignore_enoent && r == -ENOENT)
1700 return 0;
1701
1702 return log_error_errno(r, "Failed to open '%s', ignoring: %m", fn);
1703 }
1704
1705 f = rf;
1706 }
1707
1708 for (;;) {
1709 _cleanup_free_ char *line = NULL;
1710 char *l;
1711 int k;
1712
1713 k = read_line(f, LONG_LINE_MAX, &line);
1714 if (k < 0)
1715 return log_error_errno(k, "Failed to read '%s': %m", fn);
1716 if (k == 0)
1717 break;
1718
1719 v++;
1720
1721 l = strstrip(line);
1722 if (IN_SET(*l, 0, '#'))
1723 continue;
1724
1725 k = parse_line(fn, v, l);
1726 if (k < 0 && r == 0)
1727 r = k;
1728 }
1729
1730 if (ferror(f)) {
1731 log_error_errno(errno, "Failed to read from file %s: %m", fn);
1732 if (r == 0)
1733 r = -EIO;
1734 }
1735
1736 return r;
1737 }
1738
1739 static int cat_config(void) {
1740 _cleanup_strv_free_ char **files = NULL;
1741 int r;
1742
1743 r = conf_files_list_with_replacement(arg_root, CONF_PATHS_STRV("sysusers.d"), arg_replace, &files, NULL);
1744 if (r < 0)
1745 return r;
1746
1747 (void) pager_open(arg_pager_flags);
1748
1749 return cat_files(NULL, files, 0);
1750 }
1751
1752 static int help(void) {
1753 _cleanup_free_ char *link = NULL;
1754 int r;
1755
1756 r = terminal_urlify_man("systemd-sysusers.service", "8", &link);
1757 if (r < 0)
1758 return log_oom();
1759
1760 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
1761 "Creates system user accounts.\n\n"
1762 " -h --help Show this help\n"
1763 " --version Show package version\n"
1764 " --cat-config Show configuration files\n"
1765 " --root=PATH Operate on an alternate filesystem root\n"
1766 " --image=PATH Operate on disk image as filesystem root\n"
1767 " --replace=PATH Treat arguments as replacement for PATH\n"
1768 " --inline Treat arguments as configuration lines\n"
1769 " --no-pager Do not pipe output into a pager\n"
1770 "\nSee the %s for details.\n"
1771 , program_invocation_short_name
1772 , link
1773 );
1774
1775 return 0;
1776 }
1777
1778 static int parse_argv(int argc, char *argv[]) {
1779
1780 enum {
1781 ARG_VERSION = 0x100,
1782 ARG_CAT_CONFIG,
1783 ARG_ROOT,
1784 ARG_IMAGE,
1785 ARG_REPLACE,
1786 ARG_INLINE,
1787 ARG_NO_PAGER,
1788 };
1789
1790 static const struct option options[] = {
1791 { "help", no_argument, NULL, 'h' },
1792 { "version", no_argument, NULL, ARG_VERSION },
1793 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
1794 { "root", required_argument, NULL, ARG_ROOT },
1795 { "image", required_argument, NULL, ARG_IMAGE },
1796 { "replace", required_argument, NULL, ARG_REPLACE },
1797 { "inline", no_argument, NULL, ARG_INLINE },
1798 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
1799 {}
1800 };
1801
1802 int c, r;
1803
1804 assert(argc >= 0);
1805 assert(argv);
1806
1807 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
1808
1809 switch (c) {
1810
1811 case 'h':
1812 return help();
1813
1814 case ARG_VERSION:
1815 return version();
1816
1817 case ARG_CAT_CONFIG:
1818 arg_cat_config = true;
1819 break;
1820
1821 case ARG_ROOT:
1822 r = parse_path_argument_and_warn(optarg, /* suppress_root= */ false, &arg_root);
1823 if (r < 0)
1824 return r;
1825 break;
1826
1827 case ARG_IMAGE:
1828 #ifdef STANDALONE
1829 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
1830 "This systemd-sysusers version is compiled without support for --image=.");
1831 #else
1832 r = parse_path_argument_and_warn(optarg, /* suppress_root= */ false, &arg_image);
1833 if (r < 0)
1834 return r;
1835 break;
1836 #endif
1837
1838 case ARG_REPLACE:
1839 if (!path_is_absolute(optarg) ||
1840 !endswith(optarg, ".conf"))
1841 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1842 "The argument to --replace= must an absolute path to a config file");
1843
1844 arg_replace = optarg;
1845 break;
1846
1847 case ARG_INLINE:
1848 arg_inline = true;
1849 break;
1850
1851 case ARG_NO_PAGER:
1852 arg_pager_flags |= PAGER_DISABLE;
1853 break;
1854
1855 case '?':
1856 return -EINVAL;
1857
1858 default:
1859 assert_not_reached("Unhandled option");
1860 }
1861
1862 if (arg_replace && arg_cat_config)
1863 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1864 "Option --replace= is not supported with --cat-config");
1865
1866 if (arg_replace && optind >= argc)
1867 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1868 "When --replace= is given, some configuration items must be specified");
1869
1870 if (arg_image && arg_root)
1871 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Please specify either --root= or --image=, the combination of both is not supported.");
1872
1873 return 1;
1874 }
1875
1876 static int parse_arguments(char **args) {
1877 char **arg;
1878 unsigned pos = 1;
1879 int r;
1880
1881 STRV_FOREACH(arg, args) {
1882 if (arg_inline)
1883 /* Use (argument):n, where n==1 for the first positional arg */
1884 r = parse_line("(argument)", pos, *arg);
1885 else
1886 r = read_config_file(*arg, false);
1887 if (r < 0)
1888 return r;
1889
1890 pos++;
1891 }
1892
1893 return 0;
1894 }
1895
1896 static int read_config_files(char **args) {
1897 _cleanup_strv_free_ char **files = NULL;
1898 _cleanup_free_ char *p = NULL;
1899 char **f;
1900 int r;
1901
1902 r = conf_files_list_with_replacement(arg_root, CONF_PATHS_STRV("sysusers.d"), arg_replace, &files, &p);
1903 if (r < 0)
1904 return r;
1905
1906 STRV_FOREACH(f, files)
1907 if (p && path_equal(*f, p)) {
1908 log_debug("Parsing arguments at position \"%s\"…", *f);
1909
1910 r = parse_arguments(args);
1911 if (r < 0)
1912 return r;
1913 } else {
1914 log_debug("Reading config file \"%s\"…", *f);
1915
1916 /* Just warn, ignore result otherwise */
1917 (void) read_config_file(*f, true);
1918 }
1919
1920 return 0;
1921 }
1922
1923 static int run(int argc, char *argv[]) {
1924 #ifndef STANDALONE
1925 _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL;
1926 _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL;
1927 _cleanup_(umount_and_rmdir_and_freep) char *unlink_dir = NULL;
1928 #endif
1929 _cleanup_close_ int lock = -1;
1930 Item *i;
1931 int r;
1932
1933 r = parse_argv(argc, argv);
1934 if (r <= 0)
1935 return r;
1936
1937 log_setup_service();
1938
1939 if (arg_cat_config)
1940 return cat_config();
1941
1942 umask(0022);
1943
1944 r = mac_selinux_init();
1945 if (r < 0)
1946 return r;
1947
1948 #ifndef STANDALONE
1949 if (arg_image) {
1950 assert(!arg_root);
1951
1952 r = mount_image_privately_interactively(
1953 arg_image,
1954 DISSECT_IMAGE_REQUIRE_ROOT|DISSECT_IMAGE_VALIDATE_OS|DISSECT_IMAGE_RELAX_VAR_CHECK|DISSECT_IMAGE_FSCK,
1955 &unlink_dir,
1956 &loop_device,
1957 &decrypted_image);
1958 if (r < 0)
1959 return r;
1960
1961 arg_root = strdup(unlink_dir);
1962 if (!arg_root)
1963 return log_oom();
1964 }
1965 #else
1966 assert(!arg_image);
1967 #endif
1968
1969 /* If command line arguments are specified along with --replace, read all
1970 * configuration files and insert the positional arguments at the specified
1971 * place. Otherwise, if command line arguments are specified, execute just
1972 * them, and finally, without --replace= or any positional arguments, just
1973 * read configuration and execute it.
1974 */
1975 if (arg_replace || optind >= argc)
1976 r = read_config_files(argv + optind);
1977 else
1978 r = parse_arguments(argv + optind);
1979 if (r < 0)
1980 return r;
1981
1982 /* Let's tell nss-systemd not to synthesize the "root" and "nobody" entries for it, so that our detection
1983 * whether the names or UID/GID area already used otherwise doesn't get confused. After all, even though
1984 * nss-systemd synthesizes these users/groups, they should still appear in /etc/passwd and /etc/group, as the
1985 * synthesizing logic is merely supposed to be fallback for cases where we run with a completely unpopulated
1986 * /etc. */
1987 if (setenv("SYSTEMD_NSS_BYPASS_SYNTHETIC", "1", 1) < 0)
1988 return log_error_errno(errno, "Failed to set SYSTEMD_NSS_BYPASS_SYNTHETIC environment variable: %m");
1989
1990 if (!uid_range) {
1991 /* Default to default range of SYSTEMD_UID_MIN..SYSTEM_UID_MAX. */
1992 r = read_login_defs(&login_defs, NULL, arg_root);
1993 if (r < 0)
1994 return log_error_errno(r, "Failed to read %s%s: %m",
1995 strempty(arg_root), "/etc/login.defs");
1996
1997 login_defs_need_warning = true;
1998
1999 /* We pick a range that very conservative: we look at compiled-in maximum and the value in
2000 * /etc/login.defs. That way the uids/gids which we allocate will be interpreted correctly,
2001 * even if /etc/login.defs is removed later. (The bottom bound doesn't matter much, since
2002 * it's only used during allocation, so we use the configured value directly). */
2003 uid_t begin = login_defs.system_alloc_uid_min,
2004 end = MIN3((uid_t) SYSTEM_UID_MAX, login_defs.system_uid_max, login_defs.system_gid_max);
2005 if (begin < end) {
2006 r = uid_range_add(&uid_range, &n_uid_range, begin, end - begin + 1);
2007 if (r < 0)
2008 return log_oom();
2009 }
2010 }
2011
2012 r = add_implicit();
2013 if (r < 0)
2014 return r;
2015
2016 lock = take_etc_passwd_lock(arg_root);
2017 if (lock < 0)
2018 return log_error_errno(lock, "Failed to take /etc/passwd lock: %m");
2019
2020 r = load_user_database();
2021 if (r < 0)
2022 return log_error_errno(r, "Failed to load user database: %m");
2023
2024 r = load_group_database();
2025 if (r < 0)
2026 return log_error_errno(r, "Failed to read group database: %m");
2027
2028 ORDERED_HASHMAP_FOREACH(i, groups)
2029 (void) process_item(i);
2030
2031 ORDERED_HASHMAP_FOREACH(i, users)
2032 (void) process_item(i);
2033
2034 r = write_files();
2035 if (r < 0)
2036 return log_error_errno(r, "Failed to write files: %m");
2037
2038 return 0;
2039 }
2040
2041 DEFINE_MAIN_FUNCTION(run);
Unnamed repository; edit this file 'description' to name the repository.