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