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sysusers: modernize file backup logic a bit
[thirdparty/systemd.git] / src / sysusers / sysusers.c
CommitLineData
53e1b683 1/* SPDX-License-Identifier: LGPL-2.1+ */
1b992147 2
3f6fd1ba 3#include <getopt.h>
932ad62b 4#include <utmp.h>
1b992147 5
b5efdb8a 6#include "alloc-util.h"
1b992147
LP		 7#include "conf-files.h"
8#include "copy.h"
a0f29c76 9#include "def.h"
0c3ee127 10#include "dissect-image.h"
a0f29c76 11#include "fd-util.h"
ee228be1 12#include "fileio.h"
f97b34a6 13#include "format-util.h"
dcd5c891 14#include "fs-util.h"
3f6fd1ba 15#include "hashmap.h"
71da1673 16#include "main-func.h"
0c3ee127 17#include "mount-util.h"
dcd5c891 18#include "pager.h"
3f6fd1ba 19#include "path-util.h"
294bf0c3 20#include "pretty-print.h"
3f6fd1ba 21#include "selinux-util.h"
0c3ee127 22#include "set.h"
07630cea 23#include "smack-util.h"
3f6fd1ba 24#include "specifier.h"
07630cea 25#include "string-util.h"
3f6fd1ba 26#include "strv.h"
e4de7287 27#include "tmpfile-util-label.h"
3f6fd1ba 28#include "uid-range.h"
a0f29c76 29#include "user-util.h"
3f6fd1ba
LP		 30#include "utf8.h"
31#include "util.h"
1b992147
LP		 32
33typedef enum ItemType {
34 ADD_USER = 'u',
35 ADD_GROUP = 'g',
a12b0cc3 36 ADD_MEMBER = 'm',
8530dc44 37 ADD_RANGE = 'r',
1b992147 38} ItemType;
dcd5c891 39
1b992147
LP		 40typedef struct Item {
41 ItemType type;
42
43 char *name;
649916d3 44 char *group_name;
1b992147
LP		 45 char *uid_path;
46 char *gid_path;
47 char *description;
7629889c 48 char *home;
7b1aaf66 49 char *shell;
1b992147
LP		 50
51 gid_t gid;
52 uid_t uid;
53
54 bool gid_set:1;
fb959f14
ZJS		 55
56 /* When set the group with the specified gid must exist
57 * and the check if a uid clashes with the gid is skipped.
58 */
b9ee05c2 59 bool id_set_strict:1;
fb959f14 60
1b992147
LP		 61 bool uid_set:1;
62
c1b6b04f
KS		 63 bool todo_user:1;
64 bool todo_group:1;
1b992147
LP		 65} Item;
66
67static char *arg_root = NULL;
0c3ee127 68static char *arg_image = NULL;
ec0327d6 69static bool arg_cat_config = false;
d16a1c1b 70static const char *arg_replace = NULL;
1b600bd5 71static bool arg_inline = false;
0221d68a 72static PagerFlags arg_pager_flags = 0;
1b992147 73
5bc9c980
MV		 74static OrderedHashmap *users = NULL, *groups = NULL;
75static OrderedHashmap *todo_uids = NULL, *todo_gids = NULL;
76static OrderedHashmap *members = NULL;
1b992147 77
71da1673
YW		 78static Hashmap *database_by_uid = NULL, *database_by_username = NULL;
79static Hashmap *database_by_gid = NULL, *database_by_groupname = NULL;
80static Set *database_users = NULL, *database_groups = NULL;
1b992147 81
fed1e721 82static uid_t search_uid = UID_INVALID;
8530dc44
LP		 83static UidRange *uid_range = NULL;
84static unsigned n_uid_range = 0;
1b992147 85
71da1673
YW		 86STATIC_DESTRUCTOR_REGISTER(groups, ordered_hashmap_freep);
87STATIC_DESTRUCTOR_REGISTER(users, ordered_hashmap_freep);
88STATIC_DESTRUCTOR_REGISTER(members, ordered_hashmap_freep);
89STATIC_DESTRUCTOR_REGISTER(todo_uids, ordered_hashmap_freep);
90STATIC_DESTRUCTOR_REGISTER(todo_gids, ordered_hashmap_freep);
91STATIC_DESTRUCTOR_REGISTER(database_by_uid, hashmap_freep);
92STATIC_DESTRUCTOR_REGISTER(database_by_username, hashmap_freep);
93STATIC_DESTRUCTOR_REGISTER(database_users, set_free_freep);
94STATIC_DESTRUCTOR_REGISTER(database_by_gid, hashmap_freep);
95STATIC_DESTRUCTOR_REGISTER(database_by_groupname, hashmap_freep);
96STATIC_DESTRUCTOR_REGISTER(database_groups, set_free_freep);
97STATIC_DESTRUCTOR_REGISTER(uid_range, freep);
98STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
0c3ee127 99STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
71da1673 100
08c7c321
ZJS		 101static int errno_is_not_exists(int code) {
102 /* See getpwnam(3) and getgrnam(3): those codes and others can be returned if the user or group are
103 * not found. */
104 return IN_SET(code, 0, ENOENT, ESRCH, EBADF, EPERM);
105}
106
1b992147
LP		 107static int load_user_database(void) {
108 _cleanup_fclose_ FILE *f = NULL;
109 const char *passwd_path;
110 struct passwd *pw;
111 int r;
112
1d13f648 113 passwd_path = prefix_roota(arg_root, "/etc/passwd");
1b992147
LP		 114 f = fopen(passwd_path, "re");
115 if (!f)
116 return errno == ENOENT ? 0 : -errno;
117
71da1673 118 r = hashmap_ensure_allocated(&database_by_username, &string_hash_ops);
1b992147
LP		 119 if (r < 0)
120 return r;
121
71da1673 122 r = hashmap_ensure_allocated(&database_by_uid, NULL);
1b992147
LP		 123 if (r < 0)
124 return r;
125
71da1673 126 r = set_ensure_allocated(&database_users, NULL);
1b992147
LP		 127 if (r < 0)
128 return r;
129
100d5f6e 130 while ((r = fgetpwent_sane(f, &pw)) > 0) {
43e948ee 131 char *n;
340ac019 132 int k, q;
1b992147
LP		 133
134 n = strdup(pw->pw_name);
135 if (!n)
136 return -ENOMEM;
137
71da1673
YW		 138 k = set_put(database_users, n);
139 if (k < 0) {
1b992147
LP		 140 free(n);
141 return k;
142 }
143
71da1673
YW		 144 k = hashmap_put(database_by_username, n, UID_TO_PTR(pw->pw_uid));
145 if (k < 0 && k != -EEXIST)
146 return k;
1b992147 147
71da1673
YW		 148 q = hashmap_put(database_by_uid, UID_TO_PTR(pw->pw_uid), n);
149 if (q < 0 && q != -EEXIST)
150 return q;
1b992147 151 }
100d5f6e 152 return r;
1b992147
LP		 153}
154
155static int load_group_database(void) {
156 _cleanup_fclose_ FILE *f = NULL;
157 const char *group_path;
158 struct group *gr;
159 int r;
160
1d13f648 161 group_path = prefix_roota(arg_root, "/etc/group");
1b992147
LP		 162 f = fopen(group_path, "re");
163 if (!f)
164 return errno == ENOENT ? 0 : -errno;
165
71da1673 166 r = hashmap_ensure_allocated(&database_by_groupname, &string_hash_ops);
1b992147
LP		 167 if (r < 0)
168 return r;
169
71da1673 170 r = hashmap_ensure_allocated(&database_by_gid, NULL);
1b992147
LP		 171 if (r < 0)
172 return r;
173
71da1673 174 r = set_ensure_allocated(&database_groups, NULL);
1b992147
LP		 175 if (r < 0)
176 return r;
177
f030d36c 178 while ((r = fgetgrent_sane(f, &gr)) > 0) {
1b992147
LP		 179 char *n;
180 int k, q;
181
182 n = strdup(gr->gr_name);
183 if (!n)
184 return -ENOMEM;
185
71da1673
YW		 186 k = set_put(database_groups, n);
187 if (k < 0) {
1b992147
LP		 188 free(n);
189 return k;
190 }
191
71da1673
YW		 192 k = hashmap_put(database_by_groupname, n, GID_TO_PTR(gr->gr_gid));
193 if (k < 0 && k != -EEXIST)
194 return k;
1b992147 195
71da1673
YW		 196 q = hashmap_put(database_by_gid, GID_TO_PTR(gr->gr_gid), n);
197 if (q < 0 && q != -EEXIST)
198 return q;
1b992147 199 }
f030d36c 200 return r;
1b992147
LP		 201}
202
9f1c1940 203static int make_backup(const char *target, const char *x) {
62c03398 204 _cleanup_(unlink_and_freep) char *dst_tmp = NULL;
9f1c1940 205 _cleanup_fclose_ FILE *dst = NULL;
62c03398
LP		 206 _cleanup_close_ int src = -1;
207 const char *backup;
1b992147
LP		 208 struct stat st;
209 int r;
210
62c03398
LP		 211 assert(target);
212 assert(x);
213
1b992147
LP		 214 src = open(x, O_RDONLY|O_CLOEXEC|O_NOCTTY);
215 if (src < 0) {
216 if (errno == ENOENT) /* No backup necessary... */
217 return 0;
218
219 return -errno;
220 }
221
222 if (fstat(src, &st) < 0)
223 return -errno;
224
62c03398
LP		 225 r = fopen_temporary_label(
226 target, /* The path for which to the lookup the label */
227 x, /* Where we want the file actually to end up */
228 &dst,
229 &dst_tmp /* The temporary file we write to */);
9f1c1940
ZJS		 230 if (r < 0)
231 return r;
1b992147 232
1c876927 233 r = copy_bytes(src, fileno(dst), (uint64_t) -1, COPY_REFLINK);
1b992147 234 if (r < 0)
62c03398 235 return r;
9f1c1940 236
63c372cb 237 backup = strjoina(x, "-");
9f1c1940 238
62c03398
LP		 239 /* Copy over the access mask. Don't fail on chmod() or chown(). If it stays owned by us and/or
240 * unreadable by others, then it isn't too bad... */
241 r = fchmod_and_chown(fileno(dst), st.st_mode & 07777, st.st_uid, st.st_gid);
c039af23
YW		 242 if (r < 0)
243 log_warning_errno(r, "Failed to change access mode or ownership of %s: %m", backup);
1b992147 244
62c03398 245 if (futimens(fileno(dst), (const struct timespec[2]) { st.st_atim, st.st_mtim }) < 0)
56f64d95 246 log_warning_errno(errno, "Failed to fix access and modification time of %s: %m", backup);
1b992147 247
62c03398 248 r = fsync_full(fileno(dst));
0675e94a 249 if (r < 0)
62c03398 250 return r;
0675e94a 251
62c03398
LP		 252 if (rename(dst_tmp, backup) < 0)
253 return errno;
1b992147 254
62c03398 255 dst_tmp = mfree(dst_tmp); /* disable the unlink_and_freep() hook now that the file has been renamed*/
1b992147 256 return 0;
1b992147
LP		 257}
258
a12b0cc3
LP		 259static int putgrent_with_members(const struct group *gr, FILE *group) {
260 char **a;
261
262 assert(gr);
263 assert(group);
264
5bc9c980 265 a = ordered_hashmap_get(members, gr->gr_name);
a12b0cc3
LP		 266 if (a) {
267 _cleanup_strv_free_ char **l = NULL;
268 bool added = false;
269 char **i;
270
271 l = strv_copy(gr->gr_mem);
272 if (!l)
273 return -ENOMEM;
274
275 STRV_FOREACH(i, a) {
276 if (strv_find(l, *i))
277 continue;
278
279 if (strv_extend(&l, *i) < 0)
280 return -ENOMEM;
281
282 added = true;
283 }
284
285 if (added) {
286 struct group t;
100d5f6e 287 int r;
a12b0cc3
LP		 288
289 strv_uniq(l);
290 strv_sort(l);
291
292 t = *gr;
293 t.gr_mem = l;
294
100d5f6e
FB		 295 r = putgrent_sane(&t, group);
296 return r < 0 ? r : 1;
a12b0cc3
LP		 297 }
298 }
299
100d5f6e 300 return putgrent_sane(gr, group);
a12b0cc3
LP		 301}
302
349cc4a5 303#if ENABLE_GSHADOW
9ab315cc
LP		 304static int putsgent_with_members(const struct sgrp *sg, FILE *gshadow) {
305 char **a;
306
307 assert(sg);
308 assert(gshadow);
309
5bc9c980 310 a = ordered_hashmap_get(members, sg->sg_namp);
9ab315cc
LP		 311 if (a) {
312 _cleanup_strv_free_ char **l = NULL;
313 bool added = false;
314 char **i;
315
316 l = strv_copy(sg->sg_mem);
317 if (!l)
318 return -ENOMEM;
319
320 STRV_FOREACH(i, a) {
321 if (strv_find(l, *i))
322 continue;
323
324 if (strv_extend(&l, *i) < 0)
325 return -ENOMEM;
326
327 added = true;
328 }
329
330 if (added) {
331 struct sgrp t;
100d5f6e 332 int r;
9ab315cc
LP		 333
334 strv_uniq(l);
335 strv_sort(l);
336
337 t = *sg;
338 t.sg_mem = l;
339
100d5f6e
FB		 340 r = putsgent_sane(&t, gshadow);
341 return r < 0 ? r : 1;
9ab315cc
LP		 342 }
343 }
344
100d5f6e 345 return putsgent_sane(sg, gshadow);
9ab315cc 346}
b14e1b43 347#endif
9ab315cc 348
7b1aaf66 349static const char* default_shell(uid_t uid) {
6db90462 350 return uid == 0 ? "/bin/sh" : NOLOGIN;
7b1aaf66
ZJS		 351}
352
b20b0b66
FB		 353static int write_temporary_passwd(const char *passwd_path, FILE **tmpfile, char **tmpfile_path) {
354 _cleanup_fclose_ FILE *original = NULL, *passwd = NULL;
1dd98a71 355 _cleanup_(unlink_and_freep) char *passwd_tmp = NULL;
563dc6f8 356 struct passwd *pw = NULL;
1b992147
LP		 357 Item *i;
358 int r;
359
5bc9c980 360 if (ordered_hashmap_size(todo_uids) == 0)
b20b0b66 361 return 0;
1b992147 362
b20b0b66
FB		 363 r = fopen_temporary_label("/etc/passwd", passwd_path, &passwd, &passwd_tmp);
364 if (r < 0)
365 return r;
366
367 original = fopen(passwd_path, "re");
368 if (original) {
b20b0b66 369
90c81688 370 r = sync_rights(fileno(original), fileno(passwd));
1b992147 371 if (r < 0)
1dd98a71 372 return r;
1b992147 373
100d5f6e 374 while ((r = fgetpwent_sane(original, &pw)) > 0) {
1b992147 375
5bc9c980 376 i = ordered_hashmap_get(users, pw->pw_name);
330d1def
ZJS		 377 if (i && i->todo_user)
378 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
379 "%s: User \"%s\" already exists.",
380 passwd_path, pw->pw_name);
e3c72c21 381
330d1def
ZJS		 382 if (ordered_hashmap_contains(todo_uids, UID_TO_PTR(pw->pw_uid)))
383 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
384 "%s: Detected collision for UID " UID_FMT ".",
385 passwd_path, pw->pw_uid);
b20b0b66 386
563dc6f8
FB		 387 /* Make sure we keep the NIS entries (if any) at the end. */
388 if (IN_SET(pw->pw_name[0], '+', '-'))
389 break;
390
100d5f6e
FB		 391 r = putpwent_sane(pw, passwd);
392 if (r < 0)
393 return r;
b20b0b66 394 }
100d5f6e
FB		 395 if (r < 0)
396 return r;
1dd98a71
FB		 397
398 } else {
399 if (errno != ENOENT)
400 return -errno;
401 if (fchmod(fileno(passwd), 0644) < 0)
402 return -errno;
b20b0b66
FB		 403 }
404
90e74a66 405 ORDERED_HASHMAP_FOREACH(i, todo_uids) {
b20b0b66
FB		 406 struct passwd n = {
407 .pw_name = i->name,
408 .pw_uid = i->uid,
409 .pw_gid = i->gid,
410 .pw_gecos = i->description,
1b992147 411
b20b0b66
FB		 412 /* "x" means the password is stored in the shadow file */
413 .pw_passwd = (char*) "x",
a12b0cc3 414
b20b0b66 415 /* We default to the root directory as home */
636e72bc 416 .pw_dir = i->home ?: (char*) "/",
1b992147 417
b20b0b66
FB		 418 /* Initialize the shell to nologin, with one exception:
419 * for root we patch in something special */
7b1aaf66 420 .pw_shell = i->shell ?: (char*) default_shell(i->uid),
b20b0b66 421 };
9ab315cc 422
100d5f6e
FB		 423 r = putpwent_sane(&n, passwd);
424 if (r < 0)
425 return r;
b20b0b66
FB		 426 }
427
563dc6f8
FB		 428 /* Append the remaining NIS entries if any */
429 while (pw) {
100d5f6e
FB		 430 r = putpwent_sane(pw, passwd);
431 if (r < 0)
432 return r;
563dc6f8 433
100d5f6e
FB		 434 r = fgetpwent_sane(original, &pw);
435 if (r < 0)
436 return r;
437 if (r == 0)
438 break;
563dc6f8 439 }
563dc6f8 440
b20b0b66
FB		 441 r = fflush_and_check(passwd);
442 if (r < 0)
1dd98a71 443 return r;
b20b0b66 444
1cc6c93a
YW		 445 *tmpfile = TAKE_PTR(passwd);
446 *tmpfile_path = TAKE_PTR(passwd_tmp);
447
b20b0b66 448 return 0;
b20b0b66
FB		 449}
450
451static int write_temporary_shadow(const char *shadow_path, FILE **tmpfile, char **tmpfile_path) {
452 _cleanup_fclose_ FILE *original = NULL, *shadow = NULL;
1dd98a71 453 _cleanup_(unlink_and_freep) char *shadow_tmp = NULL;
19ec7de2 454 struct spwd *sp = NULL;
b20b0b66
FB		 455 long lstchg;
456 Item *i;
457 int r;
458
5bc9c980 459 if (ordered_hashmap_size(todo_uids) == 0)
b20b0b66
FB		 460 return 0;
461
462 r = fopen_temporary_label("/etc/shadow", shadow_path, &shadow, &shadow_tmp);
463 if (r < 0)
464 return r;
9ab315cc 465
b20b0b66
FB		 466 lstchg = (long) (now(CLOCK_REALTIME) / USEC_PER_DAY);
467
468 original = fopen(shadow_path, "re");
469 if (original) {
b20b0b66 470
90c81688 471 r = sync_rights(fileno(original), fileno(shadow));
9ab315cc 472 if (r < 0)
1dd98a71 473 return r;
9ab315cc 474
100d5f6e 475 while ((r = fgetspent_sane(original, &sp)) > 0) {
9ab315cc 476
5bc9c980 477 i = ordered_hashmap_get(users, sp->sp_namp);
b20b0b66
FB		 478 if (i && i->todo_user) {
479 /* we will update the existing entry */
480 sp->sp_lstchg = lstchg;
e3c72c21 481
b20b0b66
FB		 482 /* only the /etc/shadow stage is left, so we can
483 * safely remove the item from the todo set */
484 i->todo_user = false;
5bc9c980 485 ordered_hashmap_remove(todo_uids, UID_TO_PTR(i->uid));
9ab315cc 486 }
b20b0b66 487
19ec7de2
FB		 488 /* Make sure we keep the NIS entries (if any) at the end. */
489 if (IN_SET(sp->sp_namp[0], '+', '-'))
490 break;
491
100d5f6e
FB		 492 r = putspent_sane(sp, shadow);
493 if (r < 0)
494 return r;
b20b0b66 495 }
100d5f6e
FB		 496 if (r < 0)
497 return r;
1dd98a71
FB		 498
499 } else {
500 if (errno != ENOENT)
501 return -errno;
502 if (fchmod(fileno(shadow), 0000) < 0)
503 return -errno;
b20b0b66 504 }
9ab315cc 505
90e74a66 506 ORDERED_HASHMAP_FOREACH(i, todo_uids) {
b20b0b66
FB		 507 struct spwd n = {
508 .sp_namp = i->name,
fc58c0c7 509 .sp_pwdp = (char*) "!*", /* lock this password, and make it invalid */
b20b0b66
FB		 510 .sp_lstchg = lstchg,
511 .sp_min = -1,
512 .sp_max = -1,
513 .sp_warn = -1,
514 .sp_inact = -1,
12c82937 515 .sp_expire = -1,
b20b0b66
FB		 516 .sp_flag = (unsigned long) -1, /* this appears to be what everybody does ... */
517 };
9ab315cc 518
100d5f6e
FB		 519 r = putspent_sane(&n, shadow);
520 if (r < 0)
521 return r;
1b992147 522 }
19ec7de2
FB		 523
524 /* Append the remaining NIS entries if any */
525 while (sp) {
100d5f6e
FB		 526 r = putspent_sane(sp, shadow);
527 if (r < 0)
528 return r;
19ec7de2 529
100d5f6e
FB		 530 r = fgetspent_sane(original, &sp);
531 if (r < 0)
532 return r;
533 if (r == 0)
534 break;
19ec7de2
FB		 535 }
536 if (!IN_SET(errno, 0, ENOENT))
537 return -errno;
1b992147 538
0675e94a 539 r = fflush_sync_and_check(shadow);
b20b0b66 540 if (r < 0)
1dd98a71 541 return r;
b20b0b66 542
1cc6c93a
YW		 543 *tmpfile = TAKE_PTR(shadow);
544 *tmpfile_path = TAKE_PTR(shadow_tmp);
545
b20b0b66 546 return 0;
b20b0b66 547}
1b992147 548
b20b0b66
FB		 549static int write_temporary_group(const char *group_path, FILE **tmpfile, char **tmpfile_path) {
550 _cleanup_fclose_ FILE *original = NULL, *group = NULL;
1dd98a71 551 _cleanup_(unlink_and_freep) char *group_tmp = NULL;
b20b0b66 552 bool group_changed = false;
563dc6f8 553 struct group *gr = NULL;
b20b0b66
FB		 554 Item *i;
555 int r;
1b992147 556
5bc9c980 557 if (ordered_hashmap_size(todo_gids) == 0 && ordered_hashmap_size(members) == 0)
b20b0b66 558 return 0;
e3c72c21 559
b20b0b66
FB		 560 r = fopen_temporary_label("/etc/group", group_path, &group, &group_tmp);
561 if (r < 0)
562 return r;
563
564 original = fopen(group_path, "re");
565 if (original) {
b20b0b66 566
90c81688 567 r = sync_rights(fileno(original), fileno(group));
b20b0b66 568 if (r < 0)
1dd98a71 569 return r;
b20b0b66 570
100d5f6e 571 while ((r = fgetgrent_sane(original, &gr)) > 0) {
b20b0b66
FB		 572 /* Safety checks against name and GID collisions. Normally,
573 * this should be unnecessary, but given that we look at the
574 * entries anyway here, let's make an extra verification
575 * step that we don't generate duplicate entries. */
576
5bc9c980 577 i = ordered_hashmap_get(groups, gr->gr_name);
330d1def
ZJS		 578 if (i && i->todo_group)
579 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
580 "%s: Group \"%s\" already exists.",
581 group_path, gr->gr_name);
b20b0b66 582
330d1def
ZJS		 583 if (ordered_hashmap_contains(todo_gids, GID_TO_PTR(gr->gr_gid)))
584 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
585 "%s: Detected collision for GID " GID_FMT ".",
586 group_path, gr->gr_gid);
1b992147 587
563dc6f8
FB		 588 /* Make sure we keep the NIS entries (if any) at the end. */
589 if (IN_SET(gr->gr_name[0], '+', '-'))
590 break;
591
b20b0b66
FB		 592 r = putgrent_with_members(gr, group);
593 if (r < 0)
1dd98a71 594 return r;
b20b0b66
FB		 595 if (r > 0)
596 group_changed = true;
b20b0b66 597 }
100d5f6e
FB		 598 if (r < 0)
599 return r;
1dd98a71
FB		 600
601 } else {
602 if (errno != ENOENT)
603 return -errno;
604 if (fchmod(fileno(group), 0644) < 0)
605 return -errno;
b20b0b66 606 }
7629889c 607
90e74a66 608 ORDERED_HASHMAP_FOREACH(i, todo_gids) {
b20b0b66
FB		 609 struct group n = {
610 .gr_name = i->name,
611 .gr_gid = i->gid,
612 .gr_passwd = (char*) "x",
613 };
1b992147 614
b20b0b66
FB		 615 r = putgrent_with_members(&n, group);
616 if (r < 0)
1dd98a71 617 return r;
7629889c 618
b20b0b66
FB		 619 group_changed = true;
620 }
1b992147 621
563dc6f8
FB		 622 /* Append the remaining NIS entries if any */
623 while (gr) {
100d5f6e
FB		 624 r = putgrent_sane(gr, group);
625 if (r < 0)
626 return r;
563dc6f8 627
100d5f6e
FB		 628 r = fgetgrent_sane(original, &gr);
629 if (r < 0)
630 return r;
631 if (r == 0)
632 break;
563dc6f8 633 }
563dc6f8 634
0675e94a 635 r = fflush_sync_and_check(group);
b20b0b66 636 if (r < 0)
1dd98a71 637 return r;
1b992147 638
b20b0b66 639 if (group_changed) {
1cc6c93a
YW		 640 *tmpfile = TAKE_PTR(group);
641 *tmpfile_path = TAKE_PTR(group_tmp);
b20b0b66
FB		 642 }
643 return 0;
b20b0b66
FB		 644}
645
646static int write_temporary_gshadow(const char * gshadow_path, FILE **tmpfile, char **tmpfile_path) {
349cc4a5 647#if ENABLE_GSHADOW
b20b0b66 648 _cleanup_fclose_ FILE *original = NULL, *gshadow = NULL;
1dd98a71 649 _cleanup_(unlink_and_freep) char *gshadow_tmp = NULL;
b20b0b66 650 bool group_changed = false;
b20b0b66
FB		 651 Item *i;
652 int r;
653
5bc9c980 654 if (ordered_hashmap_size(todo_gids) == 0 && ordered_hashmap_size(members) == 0)
b20b0b66
FB		 655 return 0;
656
657 r = fopen_temporary_label("/etc/gshadow", gshadow_path, &gshadow, &gshadow_tmp);
658 if (r < 0)
659 return r;
9ab315cc 660
b20b0b66
FB		 661 original = fopen(gshadow_path, "re");
662 if (original) {
663 struct sgrp *sg;
664
90c81688 665 r = sync_rights(fileno(original), fileno(gshadow));
1b992147 666 if (r < 0)
1dd98a71 667 return r;
9ab315cc 668
100d5f6e 669 while ((r = fgetsgent_sane(original, &sg)) > 0) {
c5abf225 670
5bc9c980 671 i = ordered_hashmap_get(groups, sg->sg_namp);
330d1def
ZJS		 672 if (i && i->todo_group)
673 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
674 "%s: Group \"%s\" already exists.",
675 gshadow_path, sg->sg_namp);
9ab315cc 676
b20b0b66 677 r = putsgent_with_members(sg, gshadow);
fff19499 678 if (r < 0)
1dd98a71 679 return r;
b20b0b66
FB		 680 if (r > 0)
681 group_changed = true;
b20b0b66 682 }
100d5f6e
FB		 683 if (r < 0)
684 return r;
1dd98a71
FB		 685
686 } else {
687 if (errno != ENOENT)
688 return -errno;
689 if (fchmod(fileno(gshadow), 0000) < 0)
690 return -errno;
b20b0b66 691 }
9ab315cc 692
90e74a66 693 ORDERED_HASHMAP_FOREACH(i, todo_gids) {
b20b0b66
FB		 694 struct sgrp n = {
695 .sg_namp = i->name,
696 .sg_passwd = (char*) "!!",
697 };
9ab315cc 698
b20b0b66 699 r = putsgent_with_members(&n, gshadow);
9ab315cc 700 if (r < 0)
1dd98a71 701 return r;
b20b0b66
FB		 702
703 group_changed = true;
9ab315cc
LP		 704 }
705
0675e94a 706 r = fflush_sync_and_check(gshadow);
b20b0b66 707 if (r < 0)
1dd98a71 708 return r;
b20b0b66 709
9ab315cc 710 if (group_changed) {
1cc6c93a
YW		 711 *tmpfile = TAKE_PTR(gshadow);
712 *tmpfile_path = TAKE_PTR(gshadow_tmp);
b20b0b66
FB		 713 }
714 return 0;
b14e1b43
FB		 715#else
716 return 0;
717#endif
b20b0b66
FB		 718}
719
720static int write_files(void) {
b20b0b66 721 _cleanup_fclose_ FILE *passwd = NULL, *group = NULL, *shadow = NULL, *gshadow = NULL;
1dd98a71 722 _cleanup_(unlink_and_freep) char *passwd_tmp = NULL, *group_tmp = NULL, *shadow_tmp = NULL, *gshadow_tmp = NULL;
b20b0b66
FB		 723 const char *passwd_path = NULL, *group_path = NULL, *shadow_path = NULL, *gshadow_path = NULL;
724 int r;
725
726 passwd_path = prefix_roota(arg_root, "/etc/passwd");
727 shadow_path = prefix_roota(arg_root, "/etc/shadow");
728 group_path = prefix_roota(arg_root, "/etc/group");
729 gshadow_path = prefix_roota(arg_root, "/etc/gshadow");
730
731 r = write_temporary_group(group_path, &group, &group_tmp);
732 if (r < 0)
1dd98a71 733 return r;
b20b0b66
FB		 734
735 r = write_temporary_gshadow(gshadow_path, &gshadow, &gshadow_tmp);
736 if (r < 0)
1dd98a71 737 return r;
b20b0b66
FB		 738
739 r = write_temporary_passwd(passwd_path, &passwd, &passwd_tmp);
740 if (r < 0)
1dd98a71 741 return r;
b20b0b66
FB		 742
743 r = write_temporary_shadow(shadow_path, &shadow, &shadow_tmp);
744 if (r < 0)
1dd98a71 745 return r;
b20b0b66
FB		 746
747 /* Make a backup of the old files */
748 if (group) {
749 r = make_backup("/etc/group", group_path);
750 if (r < 0)
1dd98a71 751 return r;
b20b0b66
FB		 752 }
753 if (gshadow) {
754 r = make_backup("/etc/gshadow", gshadow_path);
755 if (r < 0)
1dd98a71 756 return r;
1b992147
LP		 757 }
758
759 if (passwd) {
9f1c1940 760 r = make_backup("/etc/passwd", passwd_path);
1b992147 761 if (r < 0)
1dd98a71 762 return r;
1b992147 763 }
9ab315cc
LP		 764 if (shadow) {
765 r = make_backup("/etc/shadow", shadow_path);
766 if (r < 0)
1dd98a71 767 return r;
9ab315cc 768 }
1b992147
LP		 769
770 /* And make the new files count */
b20b0b66 771 if (group) {
2da3dc69 772 r = rename_and_apply_smack_floor_label(group_tmp, group_path);
b20b0b66 773 if (r < 0)
1dd98a71 774 return r;
9ab315cc 775
b20b0b66
FB		 776 group_tmp = mfree(group_tmp);
777 }
778 if (gshadow) {
2da3dc69 779 r = rename_and_apply_smack_floor_label(gshadow_tmp, gshadow_path);
b20b0b66 780 if (r < 0)
1dd98a71 781 return r;
1b992147 782
b20b0b66 783 gshadow_tmp = mfree(gshadow_tmp);
1b992147
LP		 784 }
785
786 if (passwd) {
2da3dc69 787 r = rename_and_apply_smack_floor_label(passwd_tmp, passwd_path);
c02e7b1e 788 if (r < 0)
1dd98a71 789 return r;
1b992147 790
97b11eed 791 passwd_tmp = mfree(passwd_tmp);
1b992147 792 }
9ab315cc 793 if (shadow) {
2da3dc69 794 r = rename_and_apply_smack_floor_label(shadow_tmp, shadow_path);
c02e7b1e 795 if (r < 0)
1dd98a71 796 return r;
9ab315cc 797
97b11eed 798 shadow_tmp = mfree(shadow_tmp);
9ab315cc 799 }
1b992147 800
1dd98a71 801 return 0;
1b992147
LP		 802}
803
b9ee05c2 804static int uid_is_ok(uid_t uid, const char *name, bool check_with_gid) {
1b992147
LP		 805 struct passwd *p;
806 struct group *g;
807 const char *n;
808 Item *i;
809
810 /* Let's see if we already have assigned the UID a second time */
5bc9c980 811 if (ordered_hashmap_get(todo_uids, UID_TO_PTR(uid)))
1b992147
LP		 812 return 0;
813
814 /* Try to avoid using uids that are already used by a group
815 * that doesn't have the same name as our new user. */
b9ee05c2
MV		 816 if (check_with_gid) {
817 i = ordered_hashmap_get(todo_gids, GID_TO_PTR(uid));
818 if (i && !streq(i->name, name))
819 return 0;
820 }
1b992147
LP		 821
822 /* Let's check the files directly */
71da1673 823 if (hashmap_contains(database_by_uid, UID_TO_PTR(uid)))
1b992147
LP		 824 return 0;
825
b9ee05c2 826 if (check_with_gid) {
71da1673 827 n = hashmap_get(database_by_gid, GID_TO_PTR(uid));
b9ee05c2
MV		 828 if (n && !streq(n, name))
829 return 0;
830 }
1b992147
LP		 831
832 /* Let's also check via NSS, to avoid UID clashes over LDAP and such, just in case */
833 if (!arg_root) {
834 errno = 0;
835 p = getpwuid(uid);
836 if (p)
837 return 0;
b0284aba 838 if (!IN_SET(errno, 0, ENOENT))
1b992147
LP		 839 return -errno;
840
b9ee05c2
MV		 841 if (check_with_gid) {
842 errno = 0;
843 g = getgrgid((gid_t) uid);
844 if (g) {
845 if (!streq(g->gr_name, name))
846 return 0;
847 } else if (!IN_SET(errno, 0, ENOENT))
848 return -errno;
849 }
1b992147
LP		 850 }
851
852 return 1;
853}
854
855static int root_stat(const char *p, struct stat *st) {
856 const char *fix;
857
1d13f648 858 fix = prefix_roota(arg_root, p);
1b992147
LP		 859 if (stat(fix, st) < 0)
860 return -errno;
861
862 return 0;
863}
864
865static int read_id_from_file(Item *i, uid_t *_uid, gid_t *_gid) {
866 struct stat st;
867 bool found_uid = false, found_gid = false;
56d21cde
PDS		 868 uid_t uid = 0;
869 gid_t gid = 0;
1b992147
LP		 870
871 assert(i);
872
873 /* First, try to get the gid directly */
874 if (_gid && i->gid_path && root_stat(i->gid_path, &st) >= 0) {
875 gid = st.st_gid;
876 found_gid = true;
877 }
878
879 /* Then, try to get the uid directly */
880 if ((_uid || (_gid && !found_gid))
881 && i->uid_path
882 && root_stat(i->uid_path, &st) >= 0) {
883
884 uid = st.st_uid;
885 found_uid = true;
886
887 /* If we need the gid, but had no success yet, also derive it from the uid path */
888 if (_gid && !found_gid) {
889 gid = st.st_gid;
890 found_gid = true;
891 }
892 }
893
894 /* If that didn't work yet, then let's reuse the gid as uid */
895 if (_uid && !found_uid && i->gid_path) {
896
897 if (found_gid) {
898 uid = (uid_t) gid;
899 found_uid = true;
900 } else if (root_stat(i->gid_path, &st) >= 0) {
901 uid = (uid_t) st.st_gid;
902 found_uid = true;
903 }
904 }
905
906 if (_uid) {
907 if (!found_uid)
908 return 0;
909
910 *_uid = uid;
911 }
912
913 if (_gid) {
914 if (!found_gid)
915 return 0;
916
917 *_gid = gid;
918 }
919
920 return 1;
921}
922
923static int add_user(Item *i) {
924 void *z;
925 int r;
926
927 assert(i);
928
929 /* Check the database directly */
71da1673 930 z = hashmap_get(database_by_username, i->name);
1b992147
LP		 931 if (z) {
932 log_debug("User %s already exists.", i->name);
c1b6b04f 933 i->uid = PTR_TO_UID(z);
1b992147
LP		 934 i->uid_set = true;
935 return 0;
936 }
937
938 if (!arg_root) {
939 struct passwd *p;
1b992147
LP		 940
941 /* Also check NSS */
942 errno = 0;
943 p = getpwnam(i->name);
944 if (p) {
945 log_debug("User %s already exists.", i->name);
946 i->uid = p->pw_uid;
947 i->uid_set = true;
948
2fc09a9c
DM		 949 r = free_and_strdup(&i->description, p->pw_gecos);
950 if (r < 0)
951 return log_oom();
952
1b992147
LP		 953 return 0;
954 }
08c7c321 955 if (!errno_is_not_exists(errno))
4a62c710 956 return log_error_errno(errno, "Failed to check if user %s already exists: %m", i->name);
1b992147
LP		 957 }
958
959 /* Try to use the suggested numeric uid */
960 if (i->uid_set) {
b9ee05c2 961 r = uid_is_ok(i->uid, i->name, !i->id_set_strict);
f647962d
MS		 962 if (r < 0)
963 return log_error_errno(r, "Failed to verify uid " UID_FMT ": %m", i->uid);
1b992147
LP		 964 if (r == 0) {
965 log_debug("Suggested user ID " UID_FMT " for %s already used.", i->uid, i->name);
966 i->uid_set = false;
967 }
968 }
969
970 /* If that didn't work, try to read it from the specified path */
971 if (!i->uid_set) {
972 uid_t c;
973
974 if (read_id_from_file(i, &c, NULL) > 0) {
975
8530dc44 976 if (c <= 0 || !uid_range_contains(uid_range, n_uid_range, c))
1b992147
LP		 977 log_debug("User ID " UID_FMT " of file not suitable for %s.", c, i->name);
978 else {
b9ee05c2 979 r = uid_is_ok(c, i->name, true);
f647962d
MS		 980 if (r < 0)
981 return log_error_errno(r, "Failed to verify uid " UID_FMT ": %m", i->uid);
982 else if (r > 0) {
1b992147
LP		 983 i->uid = c;
984 i->uid_set = true;
985 } else
986 log_debug("User ID " UID_FMT " of file for %s is already used.", c, i->name);
987 }
988 }
989 }
990
b938cb90 991 /* Otherwise, try to reuse the group ID */
1b992147 992 if (!i->uid_set && i->gid_set) {
b9ee05c2 993 r = uid_is_ok((uid_t) i->gid, i->name, true);
f647962d
MS		 994 if (r < 0)
995 return log_error_errno(r, "Failed to verify uid " UID_FMT ": %m", i->uid);
1b992147
LP		 996 if (r > 0) {
997 i->uid = (uid_t) i->gid;
998 i->uid_set = true;
999 }
1000 }
1001
1002 /* And if that didn't work either, let's try to find a free one */
1003 if (!i->uid_set) {
8530dc44
LP		 1004 for (;;) {
1005 r = uid_range_next_lower(uid_range, n_uid_range, &search_uid);
330d1def
ZJS		 1006 if (r < 0)
1007 return log_error_errno(r, "No free user ID available for %s.", i->name);
1b992147 1008
b9ee05c2 1009 r = uid_is_ok(search_uid, i->name, true);
f647962d
MS		 1010 if (r < 0)
1011 return log_error_errno(r, "Failed to verify uid " UID_FMT ": %m", i->uid);
1012 else if (r > 0)
1b992147
LP		 1013 break;
1014 }
1015
1b992147
LP		 1016 i->uid_set = true;
1017 i->uid = search_uid;
1b992147
LP		 1018 }
1019
5bc9c980 1020 r = ordered_hashmap_ensure_allocated(&todo_uids, NULL);
1b992147
LP		 1021 if (r < 0)
1022 return log_oom();
1023
5bc9c980 1024 r = ordered_hashmap_put(todo_uids, UID_TO_PTR(i->uid), i);
1b992147
LP		 1025 if (r < 0)
1026 return log_oom();
1027
c1b6b04f 1028 i->todo_user = true;
1b992147
LP		 1029 log_info("Creating user %s (%s) with uid " UID_FMT " and gid " GID_FMT ".", i->name, strna(i->description), i->uid, i->gid);
1030
1031 return 0;
1032}
1033
1034static int gid_is_ok(gid_t gid) {
1035 struct group *g;
1036 struct passwd *p;
1037
5bc9c980 1038 if (ordered_hashmap_get(todo_gids, GID_TO_PTR(gid)))
1b992147
LP		 1039 return 0;
1040
1041 /* Avoid reusing gids that are already used by a different user */
5bc9c980 1042 if (ordered_hashmap_get(todo_uids, UID_TO_PTR(gid)))
1b992147
LP		 1043 return 0;
1044
71da1673 1045 if (hashmap_contains(database_by_gid, GID_TO_PTR(gid)))
1b992147
LP		 1046 return 0;
1047
71da1673 1048 if (hashmap_contains(database_by_uid, UID_TO_PTR(gid)))
1b992147
LP		 1049 return 0;
1050
1051 if (!arg_root) {
1052 errno = 0;
1053 g = getgrgid(gid);
1054 if (g)
1055 return 0;
b0284aba 1056 if (!IN_SET(errno, 0, ENOENT))
1b992147
LP		 1057 return -errno;
1058
1059 errno = 0;
1060 p = getpwuid((uid_t) gid);
1061 if (p)
1062 return 0;
b0284aba 1063 if (!IN_SET(errno, 0, ENOENT))
1b992147
LP		 1064 return -errno;
1065 }
1066
1067 return 1;
1068}
1069
649916d3 1070static int get_gid_by_name(const char *name, gid_t *gid) {
1b992147 1071 void *z;
1b992147 1072
649916d3 1073 assert(gid);
1b992147
LP		 1074
1075 /* Check the database directly */
649916d3 1076 z = hashmap_get(database_by_groupname, name);
1b992147 1077 if (z) {
649916d3 1078 *gid = PTR_TO_GID(z);
1b992147
LP		 1079 return 0;
1080 }
1081
1082 /* Also check NSS */
1083 if (!arg_root) {
1084 struct group *g;
1085
1086 errno = 0;
649916d3 1087 g = getgrnam(name);
1b992147 1088 if (g) {
649916d3 1089 *gid = g->gr_gid;
1b992147
LP		 1090 return 0;
1091 }
08c7c321 1092 if (!errno_is_not_exists(errno))
649916d3
DM		 1093 return log_error_errno(errno, "Failed to check if group %s already exists: %m", name);
1094 }
1095
1096 return -ENOENT;
1097}
1098
1099static int add_group(Item *i) {
1100 int r;
1101
1102 assert(i);
1103
1104 r = get_gid_by_name(i->name, &i->gid);
1105 if (r != -ENOENT) {
1106 if (r < 0)
1107 return r;
1108 log_debug("Group %s already exists.", i->name);
1109 i->gid_set = true;
1110 return 0;
1b992147
LP		 1111 }
1112
1113 /* Try to use the suggested numeric gid */
1114 if (i->gid_set) {
1115 r = gid_is_ok(i->gid);
f647962d
MS		 1116 if (r < 0)
1117 return log_error_errno(r, "Failed to verify gid " GID_FMT ": %m", i->gid);
b9ee05c2 1118 if (i->id_set_strict) {
28e7fad7
MV		 1119 /* If we require the gid to already exist we can return here:
1120 * r > 0: means the gid does not exist -> fail
1121 * r == 0: means the gid exists -> nothing more to do.
1122 */
baaa35ad
ZJS		 1123 if (r > 0)
1124 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1125 "Failed to create %s: please create GID %d",
1126 i->name, i->gid);
28e7fad7
MV		 1127 if (r == 0)
1128 return 0;
1129 }
1b992147
LP		 1130 if (r == 0) {
1131 log_debug("Suggested group ID " GID_FMT " for %s already used.", i->gid, i->name);
1132 i->gid_set = false;
1133 }
1134 }
1135
1136 /* Try to reuse the numeric uid, if there's one */
1137 if (!i->gid_set && i->uid_set) {
1138 r = gid_is_ok((gid_t) i->uid);
f647962d
MS		 1139 if (r < 0)
1140 return log_error_errno(r, "Failed to verify gid " GID_FMT ": %m", i->gid);
1b992147
LP		 1141 if (r > 0) {
1142 i->gid = (gid_t) i->uid;
1143 i->gid_set = true;
1144 }
1145 }
1146
1147 /* If that didn't work, try to read it from the specified path */
1148 if (!i->gid_set) {
1149 gid_t c;
1150
1151 if (read_id_from_file(i, NULL, &c) > 0) {
1152
8530dc44 1153 if (c <= 0 || !uid_range_contains(uid_range, n_uid_range, c))
1b992147
LP		 1154 log_debug("Group ID " GID_FMT " of file not suitable for %s.", c, i->name);
1155 else {
1156 r = gid_is_ok(c);
f647962d
MS		 1157 if (r < 0)
1158 return log_error_errno(r, "Failed to verify gid " GID_FMT ": %m", i->gid);
1159 else if (r > 0) {
1b992147
LP		 1160 i->gid = c;
1161 i->gid_set = true;
1162 } else
1163 log_debug("Group ID " GID_FMT " of file for %s already used.", c, i->name);
1164 }
1165 }
1166 }
1167
1168 /* And if that didn't work either, let's try to find a free one */
1169 if (!i->gid_set) {
8530dc44
LP		 1170 for (;;) {
1171 /* We look for new GIDs in the UID pool! */
1172 r = uid_range_next_lower(uid_range, n_uid_range, &search_uid);
330d1def
ZJS		 1173 if (r < 0)
1174 return log_error_errno(r, "No free group ID available for %s.", i->name);
8530dc44
LP		 1175
1176 r = gid_is_ok(search_uid);
f647962d
MS		 1177 if (r < 0)
1178 return log_error_errno(r, "Failed to verify gid " GID_FMT ": %m", i->gid);
1179 else if (r > 0)
1b992147
LP		 1180 break;
1181 }
1182
1b992147 1183 i->gid_set = true;
8530dc44 1184 i->gid = search_uid;
1b992147
LP		 1185 }
1186
5bc9c980 1187 r = ordered_hashmap_ensure_allocated(&todo_gids, NULL);
1b992147
LP		 1188 if (r < 0)
1189 return log_oom();
1190
5bc9c980 1191 r = ordered_hashmap_put(todo_gids, GID_TO_PTR(i->gid), i);
1b992147
LP		 1192 if (r < 0)
1193 return log_oom();
1194
c1b6b04f 1195 i->todo_group = true;
1b992147
LP		 1196 log_info("Creating group %s with gid " GID_FMT ".", i->name, i->gid);
1197
1198 return 0;
1199}
1200
1201static int process_item(Item *i) {
1202 int r;
1203
1204 assert(i);
1205
1206 switch (i->type) {
1207
b5327d0a
YW		 1208 case ADD_USER: {
1209 Item *j;
1210
649916d3 1211 j = ordered_hashmap_get(groups, i->group_name ?: i->name);
b5327d0a 1212 if (j && j->todo_group) {
649916d3 1213 /* When a group with the target name is already in queue,
b5327d0a
YW		 1214 * use the information about the group and do not create
1215 * duplicated group entry. */
1216 i->gid_set = j->gid_set;
1217 i->gid = j->gid;
1218 i->id_set_strict = true;
649916d3
DM		 1219 } else if (i->group_name) {
1220 /* When a group name was given instead of a GID and it's
1221 * not in queue, then it must already exist. */
1222 r = get_gid_by_name(i->group_name, &i->gid);
1223 if (r < 0)
1224 return log_error_errno(r, "Group %s not found.", i->group_name);
1225 i->gid_set = true;
1226 i->id_set_strict = true;
b5327d0a
YW		 1227 } else {
1228 r = add_group(i);
1229 if (r < 0)
1230 return r;
1231 }
1b992147
LP		 1232
1233 return add_user(i);
b5327d0a 1234 }
1b992147 1235
e2c2060f 1236 case ADD_GROUP:
1b992147 1237 return add_group(i);
1b992147 1238
a12b0cc3
LP		 1239 default:
1240 assert_not_reached("Unknown item type");
1241 }
1b992147
LP		 1242}
1243
71da1673 1244static Item* item_free(Item *i) {
1b992147 1245 if (!i)
71da1673 1246 return NULL;
1b992147
LP		 1247
1248 free(i->name);
649916d3 1249 free(i->group_name);
1b992147
LP		 1250 free(i->uid_path);
1251 free(i->gid_path);
1252 free(i->description);
d9b8ea54 1253 free(i->home);
7b1aaf66 1254 free(i->shell);
71da1673 1255 return mfree(i);
1b992147
LP		 1256}
1257
1258DEFINE_TRIVIAL_CLEANUP_FUNC(Item*, item_free);
71da1673 1259DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_hash_ops, char, string_hash_func, string_compare_func, Item, item_free);
1b992147 1260
a12b0cc3
LP		 1261static int add_implicit(void) {
1262 char *g, **l;
a12b0cc3
LP		 1263 int r;
1264
1265 /* Implicitly create additional users and groups, if they were listed in "m" lines */
90e74a66 1266 ORDERED_HASHMAP_FOREACH_KEY(l, g, members) {
a12b0cc3
LP		 1267 char **m;
1268
d4f0412d
YW		 1269 STRV_FOREACH(m, l)
1270 if (!ordered_hashmap_get(users, *m)) {
a12b0cc3
LP		 1271 _cleanup_(item_freep) Item *j = NULL;
1272
71da1673 1273 r = ordered_hashmap_ensure_allocated(&users, &item_hash_ops);
a12b0cc3
LP		 1274 if (r < 0)
1275 return log_oom();
1276
1277 j = new0(Item, 1);
1278 if (!j)
1279 return log_oom();
1280
1281 j->type = ADD_USER;
1282 j->name = strdup(*m);
1283 if (!j->name)
1284 return log_oom();
1285
5bc9c980 1286 r = ordered_hashmap_put(users, j->name, j);
a12b0cc3
LP		 1287 if (r < 0)
1288 return log_oom();
1289
1290 log_debug("Adding implicit user '%s' due to m line", j->name);
1291 j = NULL;
1292 }
d4f0412d
YW		 1293
1294 if (!(ordered_hashmap_get(users, g) ||
1295 ordered_hashmap_get(groups, g))) {
1296 _cleanup_(item_freep) Item *j = NULL;
1297
71da1673 1298 r = ordered_hashmap_ensure_allocated(&groups, &item_hash_ops);
d4f0412d
YW		 1299 if (r < 0)
1300 return log_oom();
1301
1302 j = new0(Item, 1);
1303 if (!j)
1304 return log_oom();
1305
1306 j->type = ADD_GROUP;
1307 j->name = strdup(g);
1308 if (!j->name)
1309 return log_oom();
1310
1311 r = ordered_hashmap_put(groups, j->name, j);
1312 if (r < 0)
1313 return log_oom();
1314
1315 log_debug("Adding implicit group '%s' due to m line", j->name);
1316 j = NULL;
a12b0cc3
LP		 1317 }
1318 }
1319
1320 return 0;
1321}
1322
1b992147
LP		 1323static bool item_equal(Item *a, Item *b) {
1324 assert(a);
1325 assert(b);
1326
1327 if (a->type != b->type)
1328 return false;
1329
1330 if (!streq_ptr(a->name, b->name))
1331 return false;
1332
1333 if (!streq_ptr(a->uid_path, b->uid_path))
1334 return false;
1335
1336 if (!streq_ptr(a->gid_path, b->gid_path))
1337 return false;
1338
1339 if (!streq_ptr(a->description, b->description))
1340 return false;
1341
1342 if (a->uid_set != b->uid_set)
1343 return false;
1344
1345 if (a->uid_set && a->uid != b->uid)
1346 return false;
1347
1348 if (a->gid_set != b->gid_set)
1349 return false;
1350
1351 if (a->gid_set && a->gid != b->gid)
1352 return false;
1353
7629889c
LP		 1354 if (!streq_ptr(a->home, b->home))
1355 return false;
1356
7b1aaf66
ZJS		 1357 if (!streq_ptr(a->shell, b->shell))
1358 return false;
1359
1b992147
LP		 1360 return true;
1361}
1362
1b992147
LP		 1363static int parse_line(const char *fname, unsigned line, const char *buffer) {
1364
1365 static const Specifier specifier_table[] = {
e97708fa
ZJS		 1366 { 'm', specifier_machine_id, NULL },
1367 { 'b', specifier_boot_id, NULL },
1368 { 'H', specifier_host_name, NULL },
1369 { 'l', specifier_short_host_name, NULL },
1370 { 'v', specifier_kernel_release, NULL },
1371 { 'a', specifier_architecture, NULL },
1372 { 'o', specifier_os_id, NULL },
1373 { 'w', specifier_os_version_id, NULL },
1374 { 'B', specifier_os_build_id, NULL },
1375 { 'W', specifier_os_variant_id, NULL },
1376 { 'T', specifier_tmp_dir, NULL },
1377 { 'V', specifier_var_tmp_dir, NULL },
1b992147
LP		 1378 {}
1379 };
1380
7b1aaf66
ZJS		 1381 _cleanup_free_ char *action = NULL,
1382 *name = NULL, *resolved_name = NULL,
1383 *id = NULL, *resolved_id = NULL,
b8bed700
YW		 1384 *description = NULL, *resolved_description = NULL,
1385 *home = NULL, *resolved_home = NULL,
71fb1588 1386 *shell = NULL, *resolved_shell = NULL;
1b992147
LP		 1387 _cleanup_(item_freep) Item *i = NULL;
1388 Item *existing;
5bc9c980 1389 OrderedHashmap *h;
7629889c
LP		 1390 int r;
1391 const char *p;
1b992147
LP		 1392
1393 assert(fname);
1394 assert(line >= 1);
1395 assert(buffer);
1396
7629889c
LP		 1397 /* Parse columns */
1398 p = buffer;
4ec85141 1399 r = extract_many_words(&p, NULL, EXTRACT_UNQUOTE,
7b1aaf66 1400 &action, &name, &id, &description, &home, &shell, NULL);
330d1def
ZJS		 1401 if (r < 0)
1402 return log_error_errno(r, "[%s:%u] Syntax error.", fname, line);
1403 if (r < 2)
1404 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1405 "[%s:%u] Missing action and name columns.", fname, line);
1406 if (!isempty(p))
1407 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1408 "[%s:%u] Trailing garbage.", fname, line);
1b992147 1409
7629889c 1410 /* Verify action */
330d1def
ZJS		 1411 if (strlen(action) != 1)
1412 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1413 "[%s:%u] Unknown modifier '%s'", fname, line, action);
1b992147 1414
330d1def
ZJS		 1415 if (!IN_SET(action[0], ADD_USER, ADD_GROUP, ADD_MEMBER, ADD_RANGE))
1416 return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
1417 "[%s:%u] Unknown command type '%c'.", fname, line, action[0]);
1b992147 1418
7629889c 1419 /* Verify name */
e7b88b7b 1420 if (empty_or_dash(name))
97b11eed 1421 name = mfree(name);
1b992147 1422
8530dc44
LP		 1423 if (name) {
1424 r = specifier_printf(name, specifier_table, NULL, &resolved_name);
330d1def 1425 if (r < 0)
0f7e4b28 1426 return log_error_errno(r, "[%s:%u] Failed to replace specifiers in '%s': %m", fname, line, name);
8530dc44 1427
7a8867ab 1428 if (!valid_user_group_name(resolved_name, 0))
330d1def
ZJS		 1429 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1430 "[%s:%u] '%s' is not a valid user or group name.",
1431 fname, line, resolved_name);
1b992147
LP		 1432 }
1433
8530dc44 1434 /* Verify id */
e7b88b7b 1435 if (empty_or_dash(id))
97b11eed 1436 id = mfree(id);
7629889c 1437
8530dc44
LP		 1438 if (id) {
1439 r = specifier_printf(id, specifier_table, NULL, &resolved_id);
330d1def 1440 if (r < 0)
0f7e4b28 1441 return log_error_errno(r, "[%s:%u] Failed to replace specifiers in '%s': %m",
330d1def 1442 fname, line, name);
8530dc44
LP		 1443 }
1444
1445 /* Verify description */
e7b88b7b 1446 if (empty_or_dash(description))
97b11eed 1447 description = mfree(description);
1b992147 1448
8530dc44 1449 if (description) {
b8bed700 1450 r = specifier_printf(description, specifier_table, NULL, &resolved_description);
330d1def 1451 if (r < 0)
0f7e4b28 1452 return log_error_errno(r, "[%s:%u] Failed to replace specifiers in '%s': %m",
330d1def 1453 fname, line, description);
b8bed700 1454
330d1def
ZJS		 1455 if (!valid_gecos(resolved_description))
1456 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1457 "[%s:%u] '%s' is not a valid GECOS field.",
1458 fname, line, resolved_description);
8530dc44
LP		 1459 }
1460
1461 /* Verify home */
e7b88b7b 1462 if (empty_or_dash(home))
97b11eed 1463 home = mfree(home);
1b992147 1464
8530dc44 1465 if (home) {
b8bed700 1466 r = specifier_printf(home, specifier_table, NULL, &resolved_home);
330d1def 1467 if (r < 0)
0f7e4b28 1468 return log_error_errno(r, "[%s:%u] Failed to replace specifiers in '%s': %m",
330d1def 1469 fname, line, home);
b8bed700 1470
330d1def
ZJS		 1471 if (!valid_home(resolved_home))
1472 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1473 "[%s:%u] '%s' is not a valid home directory field.",
1474 fname, line, resolved_home);
8530dc44
LP		 1475 }
1476
7b1aaf66 1477 /* Verify shell */
e7b88b7b 1478 if (empty_or_dash(shell))
7b1aaf66
ZJS		 1479 shell = mfree(shell);
1480
1481 if (shell) {
1482 r = specifier_printf(shell, specifier_table, NULL, &resolved_shell);
330d1def 1483 if (r < 0)
0f7e4b28 1484 return log_error_errno(r, "[%s:%u] Failed to replace specifiers in '%s': %m",
330d1def 1485 fname, line, shell);
7b1aaf66 1486
330d1def
ZJS		 1487 if (!valid_shell(resolved_shell))
1488 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1489 "[%s:%u] '%s' is not a valid login shell field.",
1490 fname, line, resolved_shell);
7b1aaf66
ZJS		 1491 }
1492
a12b0cc3 1493 switch (action[0]) {
1b992147 1494
8530dc44 1495 case ADD_RANGE:
330d1def
ZJS		 1496 if (resolved_name)
1497 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1498 "[%s:%u] Lines of type 'r' don't take a name field.",
1499 fname, line);
1500
1501 if (!resolved_id)
1502 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1503 "[%s:%u] Lines of type 'r' require a ID range in the third field.",
1504 fname, line);
1505
1506 if (description || home || shell)
1507 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1508 "[%s:%u] Lines of type '%c' don't take a %s field.",
1509 fname, line, action[0],
1510 description ? "GECOS" : home ? "home directory" : "login shell");
7629889c 1511
8530dc44 1512 r = uid_range_add_str(&uid_range, &n_uid_range, resolved_id);
330d1def
ZJS		 1513 if (r < 0)
1514 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1515 "[%s:%u] Invalid UID range %s.", fname, line, resolved_id);
1b992147 1516
8530dc44
LP		 1517 return 0;
1518
1519 case ADD_MEMBER: {
8530dc44 1520 /* Try to extend an existing member or group item */
330d1def
ZJS		 1521 if (!name)
1522 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1523 "[%s:%u] Lines of type 'm' require a user name in the second field.",
1524 fname, line);
1525
1526 if (!resolved_id)
1527 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1528 "[%s:%u] Lines of type 'm' require a group name in the third field.",
1529 fname, line);
1530
7a8867ab 1531 if (!valid_user_group_name(resolved_id, 0))
330d1def
ZJS		 1532 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1533 "[%s:%u] '%s' is not a valid user or group name.",
1534 fname, line, resolved_id);
1535
1536 if (description || home || shell)
1537 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1538 "[%s:%u] Lines of type '%c' don't take a %s field.",
1539 fname, line, action[0],
1540 description ? "GECOS" : home ? "home directory" : "login shell");
8530dc44 1541
cde79109 1542 r = string_strv_ordered_hashmap_put(&members, resolved_id, resolved_name);
7629889c 1543 if (r < 0)
cde79109 1544 return log_error_errno(r, "Failed to store mapping for %s: %m", resolved_id);
a12b0cc3
LP		 1545
1546 return 0;
1b992147
LP		 1547 }
1548
a12b0cc3 1549 case ADD_USER:
330d1def
ZJS		 1550 if (!name)
1551 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1552 "[%s:%u] Lines of type 'u' require a user name in the second field.",
1553 fname, line);
8530dc44 1554
71da1673 1555 r = ordered_hashmap_ensure_allocated(&users, &item_hash_ops);
a12b0cc3
LP		 1556 if (r < 0)
1557 return log_oom();
1558
1559 i = new0(Item, 1);
1560 if (!i)
1561 return log_oom();
1562
8530dc44
LP		 1563 if (resolved_id) {
1564 if (path_is_absolute(resolved_id)) {
1cc6c93a 1565 i->uid_path = TAKE_PTR(resolved_id);
858d36c1 1566 path_simplify(i->uid_path, false);
a12b0cc3 1567 } else {
4cb41413
MV		 1568 _cleanup_free_ char *uid = NULL, *gid = NULL;
1569 if (split_pair(resolved_id, ":", &uid, &gid) == 0) {
1570 r = parse_gid(gid, &i->gid);
649916d3 1571 if (r < 0) {
7a8867ab 1572 if (valid_user_group_name(gid, 0))
649916d3
DM		 1573 i->group_name = TAKE_PTR(gid);
1574 else
1575 return log_error_errno(r, "Failed to parse GID: '%s': %m", id);
1576 } else {
1577 i->gid_set = true;
1578 i->id_set_strict = true;
1579 }
4cb41413 1580 free_and_replace(resolved_id, uid);
a12b0cc3 1581 }
1825c909
MV		 1582 if (!streq(resolved_id, "-")) {
1583 r = parse_uid(resolved_id, &i->uid);
1584 if (r < 0)
1585 return log_error_errno(r, "Failed to parse UID: '%s': %m", id);
1586 i->uid_set = true;
1587 }
a12b0cc3
LP		 1588 }
1589 }
1590
b8bed700
YW		 1591 i->description = TAKE_PTR(resolved_description);
1592 i->home = TAKE_PTR(resolved_home);
1cc6c93a 1593 i->shell = TAKE_PTR(resolved_shell);
7b1aaf66 1594
1b992147 1595 h = users;
a12b0cc3
LP		 1596 break;
1597
1598 case ADD_GROUP:
330d1def
ZJS		 1599 if (!name)
1600 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1601 "[%s:%u] Lines of type 'g' require a user name in the second field.",
1602 fname, line);
a12b0cc3 1603
330d1def
ZJS		 1604 if (description || home || shell)
1605 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1606 "[%s:%u] Lines of type '%c' don't take a %s field.",
1607 fname, line, action[0],
1608 description ? "GECOS" : home ? "home directory" : "login shell");
7629889c 1609
71da1673 1610 r = ordered_hashmap_ensure_allocated(&groups, &item_hash_ops);
7629889c
LP		 1611 if (r < 0)
1612 return log_oom();
1613
a12b0cc3
LP		 1614 i = new0(Item, 1);
1615 if (!i)
1616 return log_oom();
1617
8530dc44
LP		 1618 if (resolved_id) {
1619 if (path_is_absolute(resolved_id)) {
1cc6c93a 1620 i->gid_path = TAKE_PTR(resolved_id);
858d36c1 1621 path_simplify(i->gid_path, false);
a12b0cc3 1622 } else {
8530dc44 1623 r = parse_gid(resolved_id, &i->gid);
4cb41413
MV		 1624 if (r < 0)
1625 return log_error_errno(r, "Failed to parse GID: '%s': %m", id);
a12b0cc3
LP		 1626
1627 i->gid_set = true;
1628 }
1629 }
1630
1b992147 1631 h = groups;
a12b0cc3 1632 break;
8530dc44 1633
bce415ed
RC		 1634 default:
1635 return -EBADMSG;
1b992147 1636 }
a12b0cc3
LP		 1637
1638 i->type = action[0];
1cc6c93a 1639 i->name = TAKE_PTR(resolved_name);
1b992147 1640
5bc9c980 1641 existing = ordered_hashmap_get(h, i->name);
1b992147 1642 if (existing) {
1b992147
LP		 1643 /* Two identical items are fine */
1644 if (!item_equal(existing, i))
1645 log_warning("Two or more conflicting lines for %s configured, ignoring.", i->name);
1646
1647 return 0;
1648 }
1649
5bc9c980 1650 r = ordered_hashmap_put(h, i->name, i);
a12b0cc3
LP		 1651 if (r < 0)
1652 return log_oom();
1b992147
LP		 1653
1654 i = NULL;
1655 return 0;
1656}
1657
1658static int read_config_file(const char *fn, bool ignore_enoent) {
dfc87cbf
LP		 1659 _cleanup_fclose_ FILE *rf = NULL;
1660 FILE *f = NULL;
1b992147 1661 unsigned v = 0;
c4640902 1662 int r = 0;
1b992147
LP		 1663
1664 assert(fn);
1665
dfc87cbf
LP		 1666 if (streq(fn, "-"))
1667 f = stdin;
1668 else {
a826d4f7 1669 r = search_and_fopen(fn, "re", arg_root, (const char**) CONF_PATHS_STRV("sysusers.d"), &rf);
dfc87cbf
LP		 1670 if (r < 0) {
1671 if (ignore_enoent && r == -ENOENT)
1672 return 0;
1b992147 1673
8d3d7072 1674 return log_error_errno(r, "Failed to open '%s', ignoring: %m", fn);
dfc87cbf
LP		 1675 }
1676
1677 f = rf;
1b992147
LP		 1678 }
1679
050ca299
LP		 1680 for (;;) {
1681 _cleanup_free_ char *line = NULL;
1b992147
LP		 1682 char *l;
1683 int k;
1684
050ca299
LP		 1685 k = read_line(f, LONG_LINE_MAX, &line);
1686 if (k < 0)
1687 return log_error_errno(k, "Failed to read '%s': %m", fn);
1688 if (k == 0)
1689 break;
1690
1b992147
LP		 1691 v++;
1692
1693 l = strstrip(line);
4c701096 1694 if (IN_SET(*l, 0, '#'))
1b992147
LP		 1695 continue;
1696
1697 k = parse_line(fn, v, l);
1698 if (k < 0 && r == 0)
1699 r = k;
1700 }
1701
1702 if (ferror(f)) {
56f64d95 1703 log_error_errno(errno, "Failed to read from file %s: %m", fn);
1b992147
LP		 1704 if (r == 0)
1705 r = -EIO;
1706 }
1707
1708 return r;
1709}
1710
ec0327d6
ZJS		 1711static int cat_config(void) {
1712 _cleanup_strv_free_ char **files = NULL;
ec0327d6
ZJS		 1713 int r;
1714
a826d4f7 1715 r = conf_files_list_with_replacement(arg_root, CONF_PATHS_STRV("sysusers.d"), arg_replace, &files, NULL);
ec0327d6
ZJS		 1716 if (r < 0)
1717 return r;
1718
0221d68a 1719 (void) pager_open(arg_pager_flags);
dcd5c891 1720
ec0327d6
ZJS		 1721 return cat_files(NULL, files, 0);
1722}
1723
37ec0fdd
LP		 1724static int help(void) {
1725 _cleanup_free_ char *link = NULL;
1726 int r;
1727
1728 r = terminal_urlify_man("systemd-sysusers.service", "8", &link);
1729 if (r < 0)
1730 return log_oom();
1731
1b992147
LP		 1732 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
1733 "Creates system user accounts.\n\n"
1734 " -h --help Show this help\n"
1735 " --version Show package version\n"
ec0327d6 1736 " --cat-config Show configuration files\n"
601185b4 1737 " --root=PATH Operate on an alternate filesystem root\n"
0c3ee127 1738 " --image=PATH Operate on disk image as filesystem root\n"
d16a1c1b 1739 " --replace=PATH Treat arguments as replacement for PATH\n"
1b600bd5 1740 " --inline Treat arguments as configuration lines\n"
dcd5c891 1741 " --no-pager Do not pipe output into a pager\n"
37ec0fdd
LP		 1742 "\nSee the %s for details.\n"
1743 , program_invocation_short_name
1744 , link
1745 );
1746
1747 return 0;
1b992147
LP		 1748}
1749
1750static int parse_argv(int argc, char *argv[]) {
1751
1752 enum {
1753 ARG_VERSION = 0x100,
ec0327d6 1754 ARG_CAT_CONFIG,
1b992147 1755 ARG_ROOT,
0c3ee127 1756 ARG_IMAGE,
d16a1c1b 1757 ARG_REPLACE,
1b600bd5 1758 ARG_INLINE,
dcd5c891 1759 ARG_NO_PAGER,
1b992147
LP		 1760 };
1761
1762 static const struct option options[] = {
ec0327d6
ZJS		 1763 { "help", no_argument, NULL, 'h' },
1764 { "version", no_argument, NULL, ARG_VERSION },
1765 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
1766 { "root", required_argument, NULL, ARG_ROOT },
0c3ee127 1767 { "image", required_argument, NULL, ARG_IMAGE },
ec0327d6
ZJS		 1768 { "replace", required_argument, NULL, ARG_REPLACE },
1769 { "inline", no_argument, NULL, ARG_INLINE },
dcd5c891 1770 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
1b992147
LP		 1771 {}
1772 };
1773
0f474365 1774 int c, r;
1b992147
LP		 1775
1776 assert(argc >= 0);
1777 assert(argv);
1778
601185b4 1779 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
1b992147
LP		 1780
1781 switch (c) {
1782
1783 case 'h':
37ec0fdd 1784 return help();
1b992147
LP		 1785
1786 case ARG_VERSION:
3f6fd1ba 1787 return version();
1b992147 1788
ec0327d6
ZJS		 1789 case ARG_CAT_CONFIG:
1790 arg_cat_config = true;
1791 break;
1792
1b992147 1793 case ARG_ROOT:
7dc6477d 1794 r = parse_path_argument_and_warn(optarg, /* suppress_root= */ false, &arg_root);
0f474365 1795 if (r < 0)
0f03c2a4 1796 return r;
1b992147
LP		 1797 break;
1798
0c3ee127
LP		 1799 case ARG_IMAGE:
1800 r = parse_path_argument_and_warn(optarg, /* suppress_root= */ false, &arg_image);
1801 if (r < 0)
1802 return r;
1803 break;
1804
d16a1c1b
ZJS		 1805 case ARG_REPLACE:
1806 if (!path_is_absolute(optarg) ||
baaa35ad
ZJS		 1807 !endswith(optarg, ".conf"))
1808 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1809 "The argument to --replace= must an absolute path to a config file");
d16a1c1b
ZJS		 1810
1811 arg_replace = optarg;
1812 break;
1813
1b600bd5
ZJS		 1814 case ARG_INLINE:
1815 arg_inline = true;
1816 break;
1817
dcd5c891 1818 case ARG_NO_PAGER:
0221d68a 1819 arg_pager_flags |= PAGER_DISABLE;
dcd5c891
LP		 1820 break;
1821
1b992147
LP		 1822 case '?':
1823 return -EINVAL;
1824
1825 default:
1826 assert_not_reached("Unhandled option");
1827 }
1b992147 1828
baaa35ad
ZJS		 1829 if (arg_replace && arg_cat_config)
1830 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1831 "Option --replace= is not supported with --cat-config");
ec0327d6 1832
baaa35ad
ZJS		 1833 if (arg_replace && optind >= argc)
1834 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1835 "When --replace= is given, some configuration items must be specified");
d16a1c1b 1836
0c3ee127
LP		 1837 if (arg_image && arg_root)
1838 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Please specify either --root= or --image=, the combination of both is not supported.");
1839
1b992147
LP		 1840 return 1;
1841}
1842
d16a1c1b
ZJS		 1843static int parse_arguments(char **args) {
1844 char **arg;
1845 unsigned pos = 1;
1846 int r;
1847
1848 STRV_FOREACH(arg, args) {
1849 if (arg_inline)
1850 /* Use (argument):n, where n==1 for the first positional arg */
1851 r = parse_line("(argument)", pos, *arg);
1852 else
1853 r = read_config_file(*arg, false);
1854 if (r < 0)
1855 return r;
1856
1857 pos++;
1858 }
1859
1860 return 0;
1861}
1862
ec0327d6 1863static int read_config_files(char **args) {
d16a1c1b
ZJS		 1864 _cleanup_strv_free_ char **files = NULL;
1865 _cleanup_free_ char *p = NULL;
1866 char **f;
1867 int r;
1868
a826d4f7 1869 r = conf_files_list_with_replacement(arg_root, CONF_PATHS_STRV("sysusers.d"), arg_replace, &files, &p);
d16a1c1b 1870 if (r < 0)
ec0327d6 1871 return r;
d16a1c1b
ZJS		 1872
1873 STRV_FOREACH(f, files)
1874 if (p && path_equal(*f, p)) {
1875 log_debug("Parsing arguments at position \"%s\"…", *f);
1876
1877 r = parse_arguments(args);
1878 if (r < 0)
1879 return r;
1880 } else {
1881 log_debug("Reading config file \"%s\"…", *f);
1882
1883 /* Just warn, ignore result otherwise */
1884 (void) read_config_file(*f, true);
1885 }
1886
1887 return 0;
1888}
1889
71da1673 1890static int run(int argc, char *argv[]) {
0c3ee127
LP		 1891 _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL;
1892 _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL;
1893 _cleanup_(umount_and_rmdir_and_freep) char *unlink_dir = NULL;
1b992147 1894 _cleanup_close_ int lock = -1;
1b992147 1895 Item *i;
dd2fd972 1896 int r;
1b992147
LP		 1897
1898 r = parse_argv(argc, argv);
1899 if (r <= 0)
71da1673 1900 return r;
1b992147 1901
6bf3c61c 1902 log_setup_service();
1b992147 1903
71da1673
YW		 1904 if (arg_cat_config)
1905 return cat_config();
ec0327d6 1906
1b992147
LP		 1907 umask(0022);
1908
c3dacc8b 1909 r = mac_selinux_init();
71da1673 1910 if (r < 0)
a9ba0e32 1911 return r;
1b992147 1912
0c3ee127
LP		 1913 if (arg_image) {
1914 assert(!arg_root);
1915
1916 r = mount_image_privately_interactively(
1917 arg_image,
1918 DISSECT_IMAGE_REQUIRE_ROOT|DISSECT_IMAGE_VALIDATE_OS|DISSECT_IMAGE_RELAX_VAR_CHECK|DISSECT_IMAGE_FSCK,
1919 &unlink_dir,
1920 &loop_device,
1921 &decrypted_image);
1922 if (r < 0)
1923 return r;
1924
1925 arg_root = strdup(unlink_dir);
1926 if (!arg_root)
1927 return log_oom();
1928 }
1929
d16a1c1b
ZJS		 1930 /* If command line arguments are specified along with --replace, read all
1931 * configuration files and insert the positional arguments at the specified
1932 * place. Otherwise, if command line arguments are specified, execute just
1933 * them, and finally, without --replace= or any positional arguments, just
1934 * read configuration and execute it.
1935 */
1936 if (arg_replace || optind >= argc)
ec0327d6 1937 r = read_config_files(argv + optind);
d16a1c1b
ZJS		 1938 else
1939 r = parse_arguments(argv + optind);
1940 if (r < 0)
71da1673 1941 return r;
1b992147 1942
fe102d6a
LP		 1943 /* Let's tell nss-systemd not to synthesize the "root" and "nobody" entries for it, so that our detection
1944 * whether the names or UID/GID area already used otherwise doesn't get confused. After all, even though
1945 * nss-systemd synthesizes these users/groups, they should still appear in /etc/passwd and /etc/group, as the
1946 * synthesizing logic is merely supposed to be fallback for cases where we run with a completely unpopulated
1947 * /etc. */
71da1673
YW		 1948 if (setenv("SYSTEMD_NSS_BYPASS_SYNTHETIC", "1", 1) < 0)
1949 return log_error_errno(errno, "Failed to set SYSTEMD_NSS_BYPASS_SYNTHETIC environment variable: %m");
fe102d6a 1950
8530dc44 1951 if (!uid_range) {
b9ee05c2 1952 /* Default to default range of 1..SYSTEM_UID_MAX */
8530dc44 1953 r = uid_range_add(&uid_range, &n_uid_range, 1, SYSTEM_UID_MAX);
71da1673
YW		 1954 if (r < 0)
1955 return log_oom();
8530dc44
LP		 1956 }
1957
a12b0cc3
LP		 1958 r = add_implicit();
1959 if (r < 0)
71da1673 1960 return r;
a12b0cc3 1961
e929bee0 1962 lock = take_etc_passwd_lock(arg_root);
71da1673
YW		 1963 if (lock < 0)
1964 return log_error_errno(lock, "Failed to take /etc/passwd lock: %m");
1b992147
LP		 1965
1966 r = load_user_database();
71da1673
YW		 1967 if (r < 0)
1968 return log_error_errno(r, "Failed to load user database: %m");
1b992147
LP		 1969
1970 r = load_group_database();
71da1673
YW		 1971 if (r < 0)
1972 return log_error_errno(r, "Failed to read group database: %m");
1b992147 1973
90e74a66 1974 ORDERED_HASHMAP_FOREACH(i, groups)
c1a32819 1975 (void) process_item(i);
1b992147 1976
90e74a66 1977 ORDERED_HASHMAP_FOREACH(i, users)
c1a32819 1978 (void) process_item(i);
1b992147
LP		 1979
1980 r = write_files();
1981 if (r < 0)
71da1673 1982 return log_error_errno(r, "Failed to write files: %m");
1b992147 1983
71da1673 1984 return 0;
1b992147 1985}
71da1673
YW		 1986
1987DEFINE_MAIN_FUNCTION(run);
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