]> git.ipfire.org Git - thirdparty/systemd.git/blob - src/tmpfiles/tmpfiles.c
projects / thirdparty / systemd.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
tmpfiles: support --image= similar to --root=
[thirdparty/systemd.git] / src / tmpfiles / tmpfiles.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <errno.h>
4 #include <fcntl.h>
5 #include <fnmatch.h>
6 #include <getopt.h>
7 #include <limits.h>
8 #include <linux/fs.h>
9 #include <stdbool.h>
10 #include <stddef.h>
11 #include <stdlib.h>
12 #include <sys/file.h>
13 #include <sys/xattr.h>
14 #include <sysexits.h>
15 #include <time.h>
16 #include <unistd.h>
17
18 #include "sd-path.h"
19
20 #include "acl-util.h"
21 #include "alloc-util.h"
22 #include "btrfs-util.h"
23 #include "capability-util.h"
24 #include "chattr-util.h"
25 #include "conf-files.h"
26 #include "copy.h"
27 #include "def.h"
28 #include "dirent-util.h"
29 #include "dissect-image.h"
30 #include "escape.h"
31 #include "fd-util.h"
32 #include "fileio.h"
33 #include "format-util.h"
34 #include "fs-util.h"
35 #include "glob-util.h"
36 #include "io-util.h"
37 #include "label.h"
38 #include "log.h"
39 #include "macro.h"
40 #include "main-func.h"
41 #include "mkdir.h"
42 #include "mount-util.h"
43 #include "mountpoint-util.h"
44 #include "offline-passwd.h"
45 #include "pager.h"
46 #include "parse-util.h"
47 #include "path-lookup.h"
48 #include "path-util.h"
49 #include "pretty-print.h"
50 #include "rlimit-util.h"
51 #include "rm-rf.h"
52 #include "selinux-util.h"
53 #include "set.h"
54 #include "sort-util.h"
55 #include "specifier.h"
56 #include "stat-util.h"
57 #include "stdio-util.h"
58 #include "string-table.h"
59 #include "string-util.h"
60 #include "strv.h"
61 #include "umask-util.h"
62 #include "user-util.h"
63
64 /* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
65 * them in the file system. This is intended to be used to create
66 * properly owned directories beneath /tmp, /var/tmp, /run, which are
67 * volatile and hence need to be recreated on bootup. */
68
69 typedef enum OperationMask {
70 OPERATION_CREATE = 1 << 0,
71 OPERATION_REMOVE = 1 << 1,
72 OPERATION_CLEAN = 1 << 2,
73 } OperationMask;
74
75 typedef enum ItemType {
76 /* These ones take file names */
77 CREATE_FILE = 'f',
78 TRUNCATE_FILE = 'F', /* deprecated: use f+ */
79 CREATE_DIRECTORY = 'd',
80 TRUNCATE_DIRECTORY = 'D',
81 CREATE_SUBVOLUME = 'v',
82 CREATE_SUBVOLUME_INHERIT_QUOTA = 'q',
83 CREATE_SUBVOLUME_NEW_QUOTA = 'Q',
84 CREATE_FIFO = 'p',
85 CREATE_SYMLINK = 'L',
86 CREATE_CHAR_DEVICE = 'c',
87 CREATE_BLOCK_DEVICE = 'b',
88 COPY_FILES = 'C',
89
90 /* These ones take globs */
91 WRITE_FILE = 'w',
92 EMPTY_DIRECTORY = 'e',
93 SET_XATTR = 't',
94 RECURSIVE_SET_XATTR = 'T',
95 SET_ACL = 'a',
96 RECURSIVE_SET_ACL = 'A',
97 SET_ATTRIBUTE = 'h',
98 RECURSIVE_SET_ATTRIBUTE = 'H',
99 IGNORE_PATH = 'x',
100 IGNORE_DIRECTORY_PATH = 'X',
101 REMOVE_PATH = 'r',
102 RECURSIVE_REMOVE_PATH = 'R',
103 RELABEL_PATH = 'z',
104 RECURSIVE_RELABEL_PATH = 'Z',
105 ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
106 } ItemType;
107
108 typedef struct Item {
109 ItemType type;
110
111 char *path;
112 char *argument;
113 char **xattrs;
114 #if HAVE_ACL
115 acl_t acl_access;
116 acl_t acl_default;
117 #endif
118 uid_t uid;
119 gid_t gid;
120 mode_t mode;
121 usec_t age;
122
123 dev_t major_minor;
124 unsigned attribute_value;
125 unsigned attribute_mask;
126
127 bool uid_set:1;
128 bool gid_set:1;
129 bool mode_set:1;
130 bool age_set:1;
131 bool mask_perms:1;
132 bool attribute_set:1;
133
134 bool keep_first_level:1;
135
136 bool append_or_force:1;
137
138 bool allow_failure:1;
139
140 OperationMask done;
141 } Item;
142
143 typedef struct ItemArray {
144 Item *items;
145 size_t n_items;
146 size_t allocated;
147
148 struct ItemArray *parent;
149 Set *children;
150 } ItemArray;
151
152 typedef enum DirectoryType {
153 DIRECTORY_RUNTIME,
154 DIRECTORY_STATE,
155 DIRECTORY_CACHE,
156 DIRECTORY_LOGS,
157 _DIRECTORY_TYPE_MAX,
158 } DirectoryType;
159
160 static bool arg_cat_config = false;
161 static bool arg_user = false;
162 static OperationMask arg_operation = 0;
163 static bool arg_boot = false;
164 static PagerFlags arg_pager_flags = 0;
165
166 static char **arg_include_prefixes = NULL;
167 static char **arg_exclude_prefixes = NULL;
168 static char *arg_root = NULL;
169 static char *arg_image = NULL;
170 static char *arg_replace = NULL;
171
172 #define MAX_DEPTH 256
173
174 static OrderedHashmap *items = NULL, *globs = NULL;
175 static Set *unix_sockets = NULL;
176
177 STATIC_DESTRUCTOR_REGISTER(items, ordered_hashmap_freep);
178 STATIC_DESTRUCTOR_REGISTER(globs, ordered_hashmap_freep);
179 STATIC_DESTRUCTOR_REGISTER(unix_sockets, set_free_freep);
180 STATIC_DESTRUCTOR_REGISTER(arg_include_prefixes, freep);
181 STATIC_DESTRUCTOR_REGISTER(arg_exclude_prefixes, freep);
182 STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
183 STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
184
185 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret);
186 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret);
187
188 static const Specifier specifier_table[] = {
189 { 'm', specifier_machine_id_safe, NULL },
190 { 'b', specifier_boot_id, NULL },
191 { 'H', specifier_host_name, NULL },
192 { 'l', specifier_short_host_name, NULL },
193 { 'v', specifier_kernel_release, NULL },
194 { 'a', specifier_architecture, NULL },
195 { 'o', specifier_os_id, NULL },
196 { 'w', specifier_os_version_id, NULL },
197 { 'B', specifier_os_build_id, NULL },
198 { 'W', specifier_os_variant_id, NULL },
199
200 { 'g', specifier_group_name, NULL },
201 { 'G', specifier_group_id, NULL },
202 { 'U', specifier_user_id, NULL },
203 { 'u', specifier_user_name, NULL },
204 { 'h', specifier_user_home, NULL },
205
206 { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
207 { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
208 { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
209 { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
210 { 'T', specifier_tmp_dir, NULL },
211 { 'V', specifier_var_tmp_dir, NULL },
212 {}
213 };
214
215 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret) {
216 int r;
217
218 /* If /etc/machine_id is missing or empty (e.g. in a chroot environment)
219 * return a recognizable error so that the caller can skip the rule
220 * gracefully. */
221
222 r = specifier_machine_id(specifier, data, userdata, ret);
223 if (IN_SET(r, -ENOENT, -ENOMEDIUM))
224 return -ENXIO;
225
226 return r;
227 }
228
229 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret) {
230 struct table_entry {
231 uint64_t type;
232 const char *suffix;
233 };
234
235 static const struct table_entry paths_system[] = {
236 [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
237 [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
238 [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
239 [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
240 };
241
242 static const struct table_entry paths_user[] = {
243 [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
244 [DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION },
245 [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
246 [DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
247 };
248
249 unsigned i;
250 const struct table_entry *paths;
251
252 assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
253 paths = arg_user ? paths_user : paths_system;
254
255 i = PTR_TO_UINT(data);
256 assert(i < ELEMENTSOF(paths_system));
257
258 return sd_path_lookup(paths[i].type, paths[i].suffix, ret);
259 }
260
261 static int log_unresolvable_specifier(const char *filename, unsigned line) {
262 static bool notified = false;
263
264 /* In system mode, this is called when /etc is not fully initialized (e.g.
265 * in a chroot environment) where some specifiers are unresolvable. In user
266 * mode, this is called when some variables are not defined. These cases are
267 * not considered as an error so log at LOG_NOTICE only for the first time
268 * and then downgrade this to LOG_DEBUG for the rest. */
269
270 log_syntax(NULL,
271 notified ? LOG_DEBUG : LOG_NOTICE,
272 filename, line, 0,
273 "Failed to resolve specifier: %s, skipping",
274 arg_user ? "Required $XDG_... variable not defined" : "uninitialized /etc detected");
275
276 if (!notified)
277 log_notice("All rules containing unresolvable specifiers will be skipped.");
278
279 notified = true;
280 return 0;
281 }
282
283 static int user_config_paths(char*** ret) {
284 _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
285 _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
286 _cleanup_strv_free_ char **res = NULL;
287 int r;
288
289 r = xdg_user_dirs(&config_dirs, &data_dirs);
290 if (r < 0)
291 return r;
292
293 r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
294 if (r < 0 && r != -ENXIO)
295 return r;
296
297 r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
298 if (r < 0 && r != -ENXIO)
299 return r;
300
301 r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
302 if (r < 0 && r != -ENXIO)
303 return r;
304
305 r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
306 if (r < 0)
307 return r;
308
309 r = strv_extend(&res, persistent_config);
310 if (r < 0)
311 return r;
312
313 r = strv_extend(&res, runtime_config);
314 if (r < 0)
315 return r;
316
317 r = strv_extend(&res, data_home);
318 if (r < 0)
319 return r;
320
321 r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
322 if (r < 0)
323 return r;
324
325 r = path_strv_make_absolute_cwd(res);
326 if (r < 0)
327 return r;
328
329 *ret = TAKE_PTR(res);
330 return 0;
331 }
332
333 static bool needs_glob(ItemType t) {
334 return IN_SET(t,
335 WRITE_FILE,
336 IGNORE_PATH,
337 IGNORE_DIRECTORY_PATH,
338 REMOVE_PATH,
339 RECURSIVE_REMOVE_PATH,
340 EMPTY_DIRECTORY,
341 ADJUST_MODE,
342 RELABEL_PATH,
343 RECURSIVE_RELABEL_PATH,
344 SET_XATTR,
345 RECURSIVE_SET_XATTR,
346 SET_ACL,
347 RECURSIVE_SET_ACL,
348 SET_ATTRIBUTE,
349 RECURSIVE_SET_ATTRIBUTE);
350 }
351
352 static bool takes_ownership(ItemType t) {
353 return IN_SET(t,
354 CREATE_FILE,
355 TRUNCATE_FILE,
356 CREATE_DIRECTORY,
357 EMPTY_DIRECTORY,
358 TRUNCATE_DIRECTORY,
359 CREATE_SUBVOLUME,
360 CREATE_SUBVOLUME_INHERIT_QUOTA,
361 CREATE_SUBVOLUME_NEW_QUOTA,
362 CREATE_FIFO,
363 CREATE_SYMLINK,
364 CREATE_CHAR_DEVICE,
365 CREATE_BLOCK_DEVICE,
366 COPY_FILES,
367 WRITE_FILE,
368 IGNORE_PATH,
369 IGNORE_DIRECTORY_PATH,
370 REMOVE_PATH,
371 RECURSIVE_REMOVE_PATH);
372 }
373
374 static struct Item* find_glob(OrderedHashmap *h, const char *match) {
375 ItemArray *j;
376 Iterator i;
377
378 ORDERED_HASHMAP_FOREACH(j, h, i) {
379 size_t n;
380
381 for (n = 0; n < j->n_items; n++) {
382 Item *item = j->items + n;
383
384 if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
385 return item;
386 }
387 }
388
389 return NULL;
390 }
391
392 static int load_unix_sockets(void) {
393 _cleanup_set_free_free_ Set *sockets = NULL;
394 _cleanup_fclose_ FILE *f = NULL;
395 int r;
396
397 if (unix_sockets)
398 return 0;
399
400 /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
401
402 sockets = set_new(&path_hash_ops);
403 if (!sockets)
404 return log_oom();
405
406 f = fopen("/proc/net/unix", "re");
407 if (!f)
408 return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
409 "Failed to open /proc/net/unix, ignoring: %m");
410
411 /* Skip header */
412 r = read_line(f, LONG_LINE_MAX, NULL);
413 if (r < 0)
414 return log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
415 if (r == 0)
416 return log_warning_errno(SYNTHETIC_ERRNO(EIO), "Premature end of file reading /proc/net/unix.");
417
418 for (;;) {
419 _cleanup_free_ char *line = NULL, *s = NULL;
420 char *p;
421
422 r = read_line(f, LONG_LINE_MAX, &line);
423 if (r < 0)
424 return log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
425 if (r == 0) /* EOF */
426 break;
427
428 p = strchr(line, ':');
429 if (!p)
430 continue;
431
432 if (strlen(p) < 37)
433 continue;
434
435 p += 37;
436 p += strspn(p, WHITESPACE);
437 p += strcspn(p, WHITESPACE); /* skip one more word */
438 p += strspn(p, WHITESPACE);
439
440 if (*p != '/')
441 continue;
442
443 s = strdup(p);
444 if (!s)
445 return log_oom();
446
447 path_simplify(s, false);
448
449 r = set_consume(sockets, s);
450 if (r == -EEXIST)
451 continue;
452 if (r < 0)
453 return log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
454
455 TAKE_PTR(s);
456 }
457
458 unix_sockets = TAKE_PTR(sockets);
459 return 1;
460 }
461
462 static bool unix_socket_alive(const char *fn) {
463 assert(fn);
464
465 if (load_unix_sockets() < 0)
466 return true; /* We don't know, so assume yes */
467
468 return !!set_get(unix_sockets, (char*) fn);
469 }
470
471 static DIR* xopendirat_nomod(int dirfd, const char *path) {
472 DIR *dir;
473
474 dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
475 if (dir)
476 return dir;
477
478 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
479 if (errno != EPERM)
480 return NULL;
481
482 dir = xopendirat(dirfd, path, O_NOFOLLOW);
483 if (!dir)
484 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
485
486 return dir;
487 }
488
489 static DIR* opendir_nomod(const char *path) {
490 return xopendirat_nomod(AT_FDCWD, path);
491 }
492
493 static int dir_cleanup(
494 Item *i,
495 const char *p,
496 DIR *d,
497 const struct stat *ds,
498 usec_t cutoff,
499 dev_t rootdev,
500 bool mountpoint,
501 int maxdepth,
502 bool keep_this_level) {
503
504 struct dirent *dent;
505 bool deleted = false;
506 int r = 0;
507
508 FOREACH_DIRENT_ALL(dent, d, break) {
509 struct stat s;
510 usec_t age;
511 _cleanup_free_ char *sub_path = NULL;
512
513 if (dot_or_dot_dot(dent->d_name))
514 continue;
515
516 if (fstatat(dirfd(d), dent->d_name, &s, AT_SYMLINK_NOFOLLOW) < 0) {
517 if (errno == ENOENT)
518 continue;
519
520 /* FUSE, NFS mounts, SELinux might return EACCES */
521 r = log_full_errno(errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
522 "stat(%s/%s) failed: %m", p, dent->d_name);
523 continue;
524 }
525
526 /* Stay on the same filesystem */
527 if (s.st_dev != rootdev) {
528 log_debug("Ignoring \"%s/%s\": different filesystem.", p, dent->d_name);
529 continue;
530 }
531
532 /* Try to detect bind mounts of the same filesystem instance; they
533 * do not differ in device major/minors. This type of query is not
534 * supported on all kernels or filesystem types though. */
535 if (S_ISDIR(s.st_mode)) {
536 int q;
537
538 q = fd_is_mount_point(dirfd(d), dent->d_name, 0);
539 if (q < 0)
540 log_debug_errno(q, "Failed to determine whether \"%s/%s\" is a mount point, ignoring: %m", p, dent->d_name);
541 else if (q > 0) {
542 log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.", p, dent->d_name);
543 continue;
544 }
545 }
546
547 sub_path = path_join(p, dent->d_name);
548 if (!sub_path) {
549 r = log_oom();
550 goto finish;
551 }
552
553 /* Is there an item configured for this path? */
554 if (ordered_hashmap_get(items, sub_path)) {
555 log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
556 continue;
557 }
558
559 if (find_glob(globs, sub_path)) {
560 log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
561 continue;
562 }
563
564 if (S_ISDIR(s.st_mode)) {
565 _cleanup_closedir_ DIR *sub_dir = NULL;
566
567 if (mountpoint &&
568 streq(dent->d_name, "lost+found") &&
569 s.st_uid == 0) {
570 log_debug("Ignoring directory \"%s\".", sub_path);
571 continue;
572 }
573
574 if (maxdepth <= 0)
575 log_warning("Reached max depth on \"%s\".", sub_path);
576 else {
577 int q;
578
579 sub_dir = xopendirat_nomod(dirfd(d), dent->d_name);
580 if (!sub_dir) {
581 if (errno != ENOENT)
582 r = log_warning_errno(errno, "Opening directory \"%s\" failed, ignoring: %m", sub_path);
583
584 continue;
585 }
586
587 if (flock(dirfd(sub_dir), LOCK_EX|LOCK_NB) < 0) {
588 log_debug_errno(errno, "Couldn't acquire shared BSD lock on directory \"%s\", skipping: %m", p);
589 continue;
590 }
591
592 q = dir_cleanup(i, sub_path, sub_dir, &s, cutoff, rootdev, false, maxdepth-1, false);
593 if (q < 0)
594 r = q;
595 }
596
597 /* Note: if you are wondering why we don't support the sticky bit for excluding
598 * directories from cleaning like we do it for other file system objects: well, the
599 * sticky bit already has a meaning for directories, so we don't want to overload
600 * that. */
601
602 if (keep_this_level) {
603 log_debug("Keeping directory \"%s\".", sub_path);
604 continue;
605 }
606
607 /* Ignore ctime, we change it when deleting */
608 age = timespec_load(&s.st_mtim);
609 if (age >= cutoff) {
610 char a[FORMAT_TIMESTAMP_MAX];
611 /* Follows spelling in stat(1). */
612 log_debug("Directory \"%s\": modify time %s is too new.",
613 sub_path,
614 format_timestamp_us(a, sizeof(a), age));
615 continue;
616 }
617
618 age = timespec_load(&s.st_atim);
619 if (age >= cutoff) {
620 char a[FORMAT_TIMESTAMP_MAX];
621 log_debug("Directory \"%s\": access time %s is too new.",
622 sub_path,
623 format_timestamp_us(a, sizeof(a), age));
624 continue;
625 }
626
627 log_debug("Removing directory \"%s\".", sub_path);
628 if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0)
629 if (!IN_SET(errno, ENOENT, ENOTEMPTY))
630 r = log_warning_errno(errno, "Failed to remove directory \"%s\", ignoring: %m", sub_path);
631
632 } else {
633 /* Skip files for which the sticky bit is set. These are semantics we define, and are
634 * unknown elsewhere. See XDG_RUNTIME_DIR specification for details. */
635 if (s.st_mode & S_ISVTX) {
636 log_debug("Skipping \"%s\": sticky bit set.", sub_path);
637 continue;
638 }
639
640 if (mountpoint &&
641 S_ISREG(s.st_mode) &&
642 s.st_uid == 0 &&
643 STR_IN_SET(dent->d_name,
644 ".journal",
645 "aquota.user",
646 "aquota.group")) {
647 log_debug("Skipping \"%s\".", sub_path);
648 continue;
649 }
650
651 /* Ignore sockets that are listed in /proc/net/unix */
652 if (S_ISSOCK(s.st_mode) && unix_socket_alive(sub_path)) {
653 log_debug("Skipping \"%s\": live socket.", sub_path);
654 continue;
655 }
656
657 /* Ignore device nodes */
658 if (S_ISCHR(s.st_mode) || S_ISBLK(s.st_mode)) {
659 log_debug("Skipping \"%s\": a device.", sub_path);
660 continue;
661 }
662
663 /* Keep files on this level around if this is requested */
664 if (keep_this_level) {
665 log_debug("Keeping \"%s\".", sub_path);
666 continue;
667 }
668
669 age = timespec_load(&s.st_mtim);
670 if (age >= cutoff) {
671 char a[FORMAT_TIMESTAMP_MAX];
672 /* Follows spelling in stat(1). */
673 log_debug("File \"%s\": modify time %s is too new.",
674 sub_path,
675 format_timestamp_us(a, sizeof(a), age));
676 continue;
677 }
678
679 age = timespec_load(&s.st_atim);
680 if (age >= cutoff) {
681 char a[FORMAT_TIMESTAMP_MAX];
682 log_debug("File \"%s\": access time %s is too new.",
683 sub_path,
684 format_timestamp_us(a, sizeof(a), age));
685 continue;
686 }
687
688 age = timespec_load(&s.st_ctim);
689 if (age >= cutoff) {
690 char a[FORMAT_TIMESTAMP_MAX];
691 log_debug("File \"%s\": change time %s is too new.",
692 sub_path,
693 format_timestamp_us(a, sizeof(a), age));
694 continue;
695 }
696
697 log_debug("Removing \"%s\".", sub_path);
698 if (unlinkat(dirfd(d), dent->d_name, 0) < 0)
699 if (errno != ENOENT)
700 r = log_warning_errno(errno, "Failed to remove \"%s\", ignoring: %m", sub_path);
701
702 deleted = true;
703 }
704 }
705
706 finish:
707 if (deleted) {
708 char a[FORMAT_TIMESTAMP_MAX], b[FORMAT_TIMESTAMP_MAX];
709 usec_t age1, age2;
710
711 age1 = timespec_load(&ds->st_atim);
712 age2 = timespec_load(&ds->st_mtim);
713
714 log_debug("Restoring access and modification time on \"%s\": %s, %s",
715 p,
716 format_timestamp_us(a, sizeof(a), age1),
717 format_timestamp_us(b, sizeof(b), age2));
718
719 /* Restore original directory timestamps */
720 if (futimens(dirfd(d), (struct timespec[]) {
721 ds->st_atim,
722 ds->st_mtim }) < 0)
723 log_warning_errno(errno, "Failed to revert timestamps of '%s', ignoring: %m", p);
724 }
725
726 return r;
727 }
728
729 static bool dangerous_hardlinks(void) {
730 _cleanup_free_ char *value = NULL;
731 static int cached = -1;
732 int r;
733
734 /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
735 * what the upstream default is. */
736
737 if (cached >= 0)
738 return cached;
739
740 r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
741 if (r < 0) {
742 log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
743 return true;
744 }
745
746 r = parse_boolean(value);
747 if (r < 0) {
748 log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
749 return true;
750 }
751
752 cached = r == 0;
753 return cached;
754 }
755
756 static bool hardlink_vulnerable(const struct stat *st) {
757 assert(st);
758
759 return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
760 }
761
762 static mode_t process_mask_perms(mode_t mode, mode_t current) {
763
764 if ((current & 0111) == 0)
765 mode &= ~0111;
766 if ((current & 0222) == 0)
767 mode &= ~0222;
768 if ((current & 0444) == 0)
769 mode &= ~0444;
770 if (!S_ISDIR(current))
771 mode &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
772
773 return mode;
774 }
775
776 static int fd_set_perms(Item *i, int fd, const char *path, const struct stat *st) {
777 struct stat stbuf;
778 mode_t new_mode;
779 bool do_chown;
780
781 assert(i);
782 assert(fd);
783 assert(path);
784
785 if (!i->mode_set && !i->uid_set && !i->gid_set)
786 goto shortcut;
787
788 if (!st) {
789 if (fstat(fd, &stbuf) < 0)
790 return log_error_errno(errno, "fstat(%s) failed: %m", path);
791 st = &stbuf;
792 }
793
794 if (hardlink_vulnerable(st))
795 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
796 "Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
797 path);
798
799 /* Do we need a chown()? */
800 do_chown =
801 (i->uid_set && i->uid != st->st_uid) ||
802 (i->gid_set && i->gid != st->st_gid);
803
804 /* Calculate the mode to apply */
805 new_mode = i->mode_set ? (i->mask_perms ?
806 process_mask_perms(i->mode, st->st_mode) :
807 i->mode) :
808 (st->st_mode & 07777);
809
810 if (i->mode_set && do_chown) {
811 /* Before we issue the chmod() let's reduce the access mode to the common bits of the old and
812 * the new mode. That way there's no time window where the file exists under the old owner
813 * with more than the old access modes — and not under the new owner with more than the new
814 * access modes either. */
815
816 if (S_ISLNK(st->st_mode))
817 log_debug("Skipping temporary mode fix for symlink %s.", path);
818 else {
819 mode_t m = new_mode & st->st_mode; /* Mask new mode by old mode */
820
821 if (((m ^ st->st_mode) & 07777) == 0)
822 log_debug("\"%s\" matches temporary mode %o already.", path, m);
823 else {
824 log_debug("Temporarily changing \"%s\" to mode %o.", path, m);
825 if (fchmod_opath(fd, m) < 0)
826 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
827 }
828 }
829 }
830
831 if (do_chown) {
832 log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT,
833 path,
834 i->uid_set ? i->uid : UID_INVALID,
835 i->gid_set ? i->gid : GID_INVALID);
836
837 if (fchownat(fd,
838 "",
839 i->uid_set ? i->uid : UID_INVALID,
840 i->gid_set ? i->gid : GID_INVALID,
841 AT_EMPTY_PATH) < 0)
842 return log_error_errno(errno, "fchownat() of %s failed: %m", path);
843 }
844
845 /* Now, apply the final mode. We do this in two cases: when the user set a mode explicitly, or after a
846 * chown(), since chown()'s mangle the access mode in regards to sgid/suid in some conditions. */
847 if (i->mode_set || do_chown) {
848 if (S_ISLNK(st->st_mode))
849 log_debug("Skipping mode fix for symlink %s.", path);
850 else {
851 /* Check if the chmod() is unnecessary. Note that if we did a chown() before we always
852 * chmod() here again, since it might have mangled the bits. */
853 if (!do_chown && ((new_mode ^ st->st_mode) & 07777) == 0)
854 log_debug("\"%s\" matches mode %o already.", path, new_mode);
855 else {
856 log_debug("Changing \"%s\" to mode %o.", path, new_mode);
857 if (fchmod_opath(fd, new_mode) < 0)
858 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
859 }
860 }
861 }
862
863 shortcut:
864 return label_fix(path, 0);
865 }
866
867 static int path_open_parent_safe(const char *path) {
868 _cleanup_free_ char *dn = NULL;
869 int r, fd;
870
871 if (path_equal(path, "/") || !path_is_normalized(path))
872 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
873 "Failed to open parent of '%s': invalid path.",
874 path);
875
876 dn = dirname_malloc(path);
877 if (!dn)
878 return log_oom();
879
880 r = chase_symlinks(dn, arg_root, CHASE_SAFE|CHASE_WARN, NULL, &fd);
881 if (r < 0 && r != -ENOLINK)
882 return log_error_errno(r, "Failed to validate path %s: %m", path);
883
884 return r < 0 ? r : fd;
885 }
886
887 static int path_open_safe(const char *path) {
888 int r, fd;
889
890 /* path_open_safe() returns a file descriptor opened with O_PATH after
891 * verifying that the path doesn't contain unsafe transitions, except
892 * for its final component as the function does not follow symlink. */
893
894 assert(path);
895
896 if (!path_is_normalized(path))
897 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
898 "Failed to open invalid path '%s'.",
899 path);
900
901 r = chase_symlinks(path, arg_root, CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL, &fd);
902 if (r < 0 && r != -ENOLINK)
903 return log_error_errno(r, "Failed to validate path %s: %m", path);
904
905 return r < 0 ? r : fd;
906 }
907
908 static int path_set_perms(Item *i, const char *path) {
909 _cleanup_close_ int fd = -1;
910
911 assert(i);
912 assert(path);
913
914 fd = path_open_safe(path);
915 if (fd < 0)
916 return fd;
917
918 return fd_set_perms(i, fd, path, NULL);
919 }
920
921 static int parse_xattrs_from_arg(Item *i) {
922 const char *p;
923 int r;
924
925 assert(i);
926 assert(i->argument);
927
928 p = i->argument;
929
930 for (;;) {
931 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
932
933 r = extract_first_word(&p, &xattr, NULL, EXTRACT_UNQUOTE|EXTRACT_CUNESCAPE);
934 if (r < 0)
935 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
936 if (r <= 0)
937 break;
938
939 r = split_pair(xattr, "=", &name, &value);
940 if (r < 0) {
941 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
942 continue;
943 }
944
945 if (isempty(name) || isempty(value)) {
946 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
947 continue;
948 }
949
950 if (strv_push_pair(&i->xattrs, name, value) < 0)
951 return log_oom();
952
953 name = value = NULL;
954 }
955
956 return 0;
957 }
958
959 static int fd_set_xattrs(Item *i, int fd, const char *path, const struct stat *st) {
960 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
961 char **name, **value;
962
963 assert(i);
964 assert(fd);
965 assert(path);
966
967 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
968
969 STRV_FOREACH_PAIR(name, value, i->xattrs) {
970 log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
971 if (setxattr(procfs_path, *name, *value, strlen(*value), 0) < 0)
972 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
973 *name, *value, path);
974 }
975 return 0;
976 }
977
978 static int path_set_xattrs(Item *i, const char *path) {
979 _cleanup_close_ int fd = -1;
980
981 assert(i);
982 assert(path);
983
984 fd = path_open_safe(path);
985 if (fd < 0)
986 return fd;
987
988 return fd_set_xattrs(i, fd, path, NULL);
989 }
990
991 static int parse_acls_from_arg(Item *item) {
992 #if HAVE_ACL
993 int r;
994
995 assert(item);
996
997 /* If append_or_force (= modify) is set, we will not modify the acl
998 * afterwards, so the mask can be added now if necessary. */
999
1000 r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->append_or_force);
1001 if (r < 0)
1002 log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
1003 #else
1004 log_warning_errno(SYNTHETIC_ERRNO(ENOSYS), "ACLs are not supported. Ignoring");
1005 #endif
1006
1007 return 0;
1008 }
1009
1010 #if HAVE_ACL
1011 static int path_set_acl(const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) {
1012 _cleanup_(acl_free_charpp) char *t = NULL;
1013 _cleanup_(acl_freep) acl_t dup = NULL;
1014 int r;
1015
1016 /* Returns 0 for success, positive error if already warned,
1017 * negative error otherwise. */
1018
1019 if (modify) {
1020 r = acls_for_file(path, type, acl, &dup);
1021 if (r < 0)
1022 return r;
1023
1024 r = calc_acl_mask_if_needed(&dup);
1025 if (r < 0)
1026 return r;
1027 } else {
1028 dup = acl_dup(acl);
1029 if (!dup)
1030 return -errno;
1031
1032 /* the mask was already added earlier if needed */
1033 }
1034
1035 r = add_base_acls_if_needed(&dup, path);
1036 if (r < 0)
1037 return r;
1038
1039 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
1040 log_debug("Setting %s ACL %s on %s.",
1041 type == ACL_TYPE_ACCESS ? "access" : "default",
1042 strna(t), pretty);
1043
1044 r = acl_set_file(path, type, dup);
1045 if (r < 0)
1046 /* Return positive to indicate we already warned */
1047 return -log_error_errno(errno,
1048 "Setting %s ACL \"%s\" on %s failed: %m",
1049 type == ACL_TYPE_ACCESS ? "access" : "default",
1050 strna(t), pretty);
1051
1052 return 0;
1053 }
1054 #endif
1055
1056 static int fd_set_acls(Item *item, int fd, const char *path, const struct stat *st) {
1057 int r = 0;
1058 #if HAVE_ACL
1059 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1060 struct stat stbuf;
1061
1062 assert(item);
1063 assert(fd);
1064 assert(path);
1065
1066 if (!st) {
1067 if (fstat(fd, &stbuf) < 0)
1068 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1069 st = &stbuf;
1070 }
1071
1072 if (hardlink_vulnerable(st))
1073 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
1074 "Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
1075 path);
1076
1077 if (S_ISLNK(st->st_mode)) {
1078 log_debug("Skipping ACL fix for symlink %s.", path);
1079 return 0;
1080 }
1081
1082 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1083
1084 if (item->acl_access)
1085 r = path_set_acl(procfs_path, path, ACL_TYPE_ACCESS, item->acl_access, item->append_or_force);
1086
1087 /* set only default acls to folders */
1088 if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
1089 r = path_set_acl(procfs_path, path, ACL_TYPE_DEFAULT, item->acl_default, item->append_or_force);
1090
1091 if (r > 0)
1092 return -r; /* already warned */
1093
1094 /* The above procfs paths don't work if /proc is not mounted. */
1095 if (r == -ENOENT && proc_mounted() == 0)
1096 r = -ENOSYS;
1097
1098 if (r == -EOPNOTSUPP) {
1099 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1100 return 0;
1101 }
1102 if (r < 0)
1103 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1104 #endif
1105 return r;
1106 }
1107
1108 static int path_set_acls(Item *item, const char *path) {
1109 int r = 0;
1110 #if HAVE_ACL
1111 _cleanup_close_ int fd = -1;
1112
1113 assert(item);
1114 assert(path);
1115
1116 fd = path_open_safe(path);
1117 if (fd < 0)
1118 return fd;
1119
1120 r = fd_set_acls(item, fd, path, NULL);
1121 #endif
1122 return r;
1123 }
1124
1125 static int parse_attribute_from_arg(Item *item) {
1126
1127 static const struct {
1128 char character;
1129 unsigned value;
1130 } attributes[] = {
1131 { 'A', FS_NOATIME_FL }, /* do not update atime */
1132 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1133 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1134 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1135 { 'c', FS_COMPR_FL }, /* Compress file */
1136 { 'd', FS_NODUMP_FL }, /* do not dump file */
1137 { 'e', FS_EXTENT_FL }, /* Extents */
1138 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1139 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1140 { 's', FS_SECRM_FL }, /* Secure deletion */
1141 { 'u', FS_UNRM_FL }, /* Undelete */
1142 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1143 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1144 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1145 { 'P', FS_PROJINHERIT_FL }, /* Inherit the quota project ID */
1146 };
1147
1148 enum {
1149 MODE_ADD,
1150 MODE_DEL,
1151 MODE_SET
1152 } mode = MODE_ADD;
1153
1154 unsigned value = 0, mask = 0;
1155 const char *p;
1156
1157 assert(item);
1158
1159 p = item->argument;
1160 if (p) {
1161 if (*p == '+') {
1162 mode = MODE_ADD;
1163 p++;
1164 } else if (*p == '-') {
1165 mode = MODE_DEL;
1166 p++;
1167 } else if (*p == '=') {
1168 mode = MODE_SET;
1169 p++;
1170 }
1171 }
1172
1173 if (isempty(p) && mode != MODE_SET)
1174 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1175 "Setting file attribute on '%s' needs an attribute specification.",
1176 item->path);
1177
1178 for (; p && *p ; p++) {
1179 unsigned i, v;
1180
1181 for (i = 0; i < ELEMENTSOF(attributes); i++)
1182 if (*p == attributes[i].character)
1183 break;
1184
1185 if (i >= ELEMENTSOF(attributes))
1186 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1187 "Unknown file attribute '%c' on '%s'.",
1188 *p, item->path);
1189
1190 v = attributes[i].value;
1191
1192 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1193
1194 mask |= v;
1195 }
1196
1197 if (mode == MODE_SET)
1198 mask |= CHATTR_ALL_FL;
1199
1200 assert(mask != 0);
1201
1202 item->attribute_mask = mask;
1203 item->attribute_value = value;
1204 item->attribute_set = true;
1205
1206 return 0;
1207 }
1208
1209 static int fd_set_attribute(Item *item, int fd, const char *path, const struct stat *st) {
1210 _cleanup_close_ int procfs_fd = -1;
1211 struct stat stbuf;
1212 unsigned f;
1213 int r;
1214
1215 assert(item);
1216 assert(fd);
1217 assert(path);
1218
1219 if (!item->attribute_set || item->attribute_mask == 0)
1220 return 0;
1221
1222 if (!st) {
1223 if (fstat(fd, &stbuf) < 0)
1224 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1225 st = &stbuf;
1226 }
1227
1228 /* Issuing the file attribute ioctls on device nodes is not
1229 * safe, as that will be delivered to the drivers, not the
1230 * file system containing the device node. */
1231 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
1232 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1233 "Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
1234 path);
1235
1236 f = item->attribute_value & item->attribute_mask;
1237
1238 /* Mask away directory-specific flags */
1239 if (!S_ISDIR(st->st_mode))
1240 f &= ~FS_DIRSYNC_FL;
1241
1242 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1243 if (procfs_fd < 0)
1244 return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
1245
1246 r = chattr_fd(procfs_fd, f, item->attribute_mask, NULL);
1247 if (r < 0)
1248 log_full_errno(IN_SET(r, -ENOTTY, -EOPNOTSUPP) ? LOG_DEBUG : LOG_WARNING,
1249 r,
1250 "Cannot set file attribute for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1251 path, item->attribute_value, item->attribute_mask);
1252
1253 return 0;
1254 }
1255
1256 static int path_set_attribute(Item *item, const char *path) {
1257 _cleanup_close_ int fd = -1;
1258
1259 if (!item->attribute_set || item->attribute_mask == 0)
1260 return 0;
1261
1262 fd = path_open_safe(path);
1263 if (fd < 0)
1264 return fd;
1265
1266 return fd_set_attribute(item, fd, path, NULL);
1267 }
1268
1269 static int write_one_file(Item *i, const char *path) {
1270 _cleanup_close_ int fd = -1, dir_fd = -1;
1271 char *bn;
1272 int r;
1273
1274 assert(i);
1275 assert(path);
1276 assert(i->argument);
1277 assert(i->type == WRITE_FILE);
1278
1279 /* Validate the path and keep the fd on the directory for opening the
1280 * file so we're sure that it can't be changed behind our back. */
1281 dir_fd = path_open_parent_safe(path);
1282 if (dir_fd < 0)
1283 return dir_fd;
1284
1285 bn = basename(path);
1286
1287 /* Follows symlinks */
1288 fd = openat(dir_fd, bn,
1289 O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY|(i->append_or_force ? O_APPEND : 0),
1290 i->mode);
1291 if (fd < 0) {
1292 if (errno == ENOENT) {
1293 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1294 return 0;
1295 }
1296
1297 if (i->allow_failure)
1298 return log_debug_errno(errno, "Failed to open file \"%s\", ignoring: %m", path);
1299
1300 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1301 }
1302
1303 /* 'w' is allowed to write into any kind of files. */
1304 log_debug("Writing to \"%s\".", path);
1305
1306 r = loop_write(fd, i->argument, strlen(i->argument), false);
1307 if (r < 0)
1308 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1309
1310 return fd_set_perms(i, fd, path, NULL);
1311 }
1312
1313 static int create_file(Item *i, const char *path) {
1314 _cleanup_close_ int fd = -1, dir_fd = -1;
1315 struct stat stbuf, *st = NULL;
1316 int r = 0;
1317 char *bn;
1318
1319 assert(i);
1320 assert(path);
1321 assert(i->type == CREATE_FILE);
1322
1323 /* 'f' operates on regular files exclusively. */
1324
1325 /* Validate the path and keep the fd on the directory for opening the
1326 * file so we're sure that it can't be changed behind our back. */
1327 dir_fd = path_open_parent_safe(path);
1328 if (dir_fd < 0)
1329 return dir_fd;
1330
1331 bn = basename(path);
1332
1333 RUN_WITH_UMASK(0000) {
1334 mac_selinux_create_file_prepare(path, S_IFREG);
1335 fd = openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1336 mac_selinux_create_file_clear();
1337 }
1338
1339 if (fd < 0) {
1340 /* Even on a read-only filesystem, open(2) returns EEXIST if the
1341 * file already exists. It returns EROFS only if it needs to
1342 * create the file. */
1343 if (errno != EEXIST)
1344 return log_error_errno(errno, "Failed to create file %s: %m", path);
1345
1346 /* Re-open the file. At that point it must exist since open(2)
1347 * failed with EEXIST. We still need to check if the perms/mode
1348 * need to be changed. For read-only filesystems, we let
1349 * fd_set_perms() report the error if the perms need to be
1350 * modified. */
1351 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1352 if (fd < 0)
1353 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1354
1355 if (fstat(fd, &stbuf) < 0)
1356 return log_error_errno(errno, "stat(%s) failed: %m", path);
1357
1358 if (!S_ISREG(stbuf.st_mode)) {
1359 log_error("%s exists and is not a regular file.", path);
1360 return -EEXIST;
1361 }
1362
1363 st = &stbuf;
1364 } else {
1365
1366 log_debug("\"%s\" has been created.", path);
1367
1368 if (i->argument) {
1369 log_debug("Writing to \"%s\".", path);
1370
1371 r = loop_write(fd, i->argument, strlen(i->argument), false);
1372 if (r < 0)
1373 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1374 }
1375 }
1376
1377 return fd_set_perms(i, fd, path, st);
1378 }
1379
1380 static int truncate_file(Item *i, const char *path) {
1381 _cleanup_close_ int fd = -1, dir_fd = -1;
1382 struct stat stbuf, *st = NULL;
1383 bool erofs = false;
1384 int r = 0;
1385 char *bn;
1386
1387 assert(i);
1388 assert(path);
1389 assert(i->type == TRUNCATE_FILE || (i->type == CREATE_FILE && i->append_or_force));
1390
1391 /* We want to operate on regular file exclusively especially since
1392 * O_TRUNC is unspecified if the file is neither a regular file nor a
1393 * fifo nor a terminal device. Therefore we first open the file and make
1394 * sure it's a regular one before truncating it. */
1395
1396 /* Validate the path and keep the fd on the directory for opening the
1397 * file so we're sure that it can't be changed behind our back. */
1398 dir_fd = path_open_parent_safe(path);
1399 if (dir_fd < 0)
1400 return dir_fd;
1401
1402 bn = basename(path);
1403
1404 RUN_WITH_UMASK(0000) {
1405 mac_selinux_create_file_prepare(path, S_IFREG);
1406 fd = openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1407 mac_selinux_create_file_clear();
1408 }
1409
1410 if (fd < 0) {
1411 if (errno != EROFS)
1412 return log_error_errno(errno, "Failed to open/create file %s: %m", path);
1413
1414 /* On a read-only filesystem, we don't want to fail if the
1415 * target is already empty and the perms are set. So we still
1416 * proceed with the sanity checks and let the remaining
1417 * operations fail with EROFS if they try to modify the target
1418 * file. */
1419
1420 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1421 if (fd < 0) {
1422 if (errno == ENOENT) {
1423 log_error("Cannot create file %s on a read-only file system.", path);
1424 return -EROFS;
1425 }
1426
1427 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1428 }
1429
1430 erofs = true;
1431 }
1432
1433 if (fstat(fd, &stbuf) < 0)
1434 return log_error_errno(errno, "stat(%s) failed: %m", path);
1435
1436 if (!S_ISREG(stbuf.st_mode)) {
1437 log_error("%s exists and is not a regular file.", path);
1438 return -EEXIST;
1439 }
1440
1441 if (stbuf.st_size > 0) {
1442 if (ftruncate(fd, 0) < 0) {
1443 r = erofs ? -EROFS : -errno;
1444 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1445 }
1446 } else
1447 st = &stbuf;
1448
1449 log_debug("\"%s\" has been created.", path);
1450
1451 if (i->argument) {
1452 log_debug("Writing to \"%s\".", path);
1453
1454 r = loop_write(fd, i->argument, strlen(i->argument), false);
1455 if (r < 0) {
1456 r = erofs ? -EROFS : r;
1457 return log_error_errno(r, "Failed to write file %s: %m", path);
1458 }
1459 }
1460
1461 return fd_set_perms(i, fd, path, st);
1462 }
1463
1464 static int copy_files(Item *i) {
1465 _cleanup_close_ int dfd = -1, fd = -1;
1466 char *bn;
1467 int r;
1468
1469 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1470
1471 bn = basename(i->path);
1472
1473 /* Validate the path and use the returned directory fd for copying the
1474 * target so we're sure that the path can't be changed behind our
1475 * back. */
1476 dfd = path_open_parent_safe(i->path);
1477 if (dfd < 0)
1478 return dfd;
1479
1480 r = copy_tree_at(AT_FDCWD, i->argument,
1481 dfd, bn,
1482 i->uid_set ? i->uid : UID_INVALID,
1483 i->gid_set ? i->gid : GID_INVALID,
1484 COPY_REFLINK | COPY_MERGE_EMPTY | COPY_MAC_CREATE);
1485 if (r < 0) {
1486 struct stat a, b;
1487
1488 /* If the target already exists on read-only filesystems, trying
1489 * to create the target will not fail with EEXIST but with
1490 * EROFS. */
1491 if (r == -EROFS && faccessat(dfd, bn, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
1492 r = -EEXIST;
1493
1494 if (r != -EEXIST)
1495 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1496
1497 if (stat(i->argument, &a) < 0)
1498 return log_error_errno(errno, "stat(%s) failed: %m", i->argument);
1499
1500 if (fstatat(dfd, bn, &b, AT_SYMLINK_NOFOLLOW) < 0)
1501 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1502
1503 if ((a.st_mode ^ b.st_mode) & S_IFMT) {
1504 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1505 return 0;
1506 }
1507 }
1508
1509 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1510 if (fd < 0)
1511 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1512
1513 return fd_set_perms(i, fd, i->path, NULL);
1514 }
1515
1516 typedef enum {
1517 CREATION_NORMAL,
1518 CREATION_EXISTING,
1519 CREATION_FORCE,
1520 _CREATION_MODE_MAX,
1521 _CREATION_MODE_INVALID = -1
1522 } CreationMode;
1523
1524 static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = {
1525 [CREATION_NORMAL] = "Created",
1526 [CREATION_EXISTING] = "Found existing",
1527 [CREATION_FORCE] = "Created replacement",
1528 };
1529
1530 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
1531
1532 static int create_directory_or_subvolume(const char *path, mode_t mode, bool subvol, CreationMode *creation) {
1533 _cleanup_close_ int pfd = -1;
1534 CreationMode c;
1535 int r;
1536
1537 assert(path);
1538
1539 if (!creation)
1540 creation = &c;
1541
1542 pfd = path_open_parent_safe(path);
1543 if (pfd < 0)
1544 return pfd;
1545
1546 if (subvol) {
1547 if (btrfs_is_subvol(empty_to_root(arg_root)) <= 0)
1548
1549 /* Don't create a subvolume unless the root directory is
1550 * one, too. We do this under the assumption that if the
1551 * root directory is just a plain directory (i.e. very
1552 * light-weight), we shouldn't try to split it up into
1553 * subvolumes (i.e. more heavy-weight). Thus, chroot()
1554 * environments and suchlike will get a full brtfs
1555 * subvolume set up below their tree only if they
1556 * specifically set up a btrfs subvolume for the root
1557 * dir too. */
1558
1559 subvol = false;
1560 else {
1561 RUN_WITH_UMASK((~mode) & 0777)
1562 r = btrfs_subvol_make_fd(pfd, basename(path));
1563 }
1564 } else
1565 r = 0;
1566
1567 if (!subvol || r == -ENOTTY)
1568 RUN_WITH_UMASK(0000)
1569 r = mkdirat_label(pfd, basename(path), mode);
1570
1571 if (r < 0) {
1572 int k;
1573
1574 if (!IN_SET(r, -EEXIST, -EROFS))
1575 return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", path);
1576
1577 k = is_dir_fd(pfd);
1578 if (k == -ENOENT && r == -EROFS)
1579 return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", path);
1580 if (k < 0)
1581 return log_error_errno(k, "Failed to check if %s exists: %m", path);
1582 if (!k) {
1583 log_warning("\"%s\" already exists and is not a directory.", path);
1584 return -EEXIST;
1585 }
1586
1587 *creation = CREATION_EXISTING;
1588 } else
1589 *creation = CREATION_NORMAL;
1590
1591 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(*creation), path);
1592
1593 r = openat(pfd, basename(path), O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
1594 if (r < 0)
1595 return log_error_errno(errno, "Failed to open directory '%s': %m", basename(path));
1596
1597 return r;
1598 }
1599
1600 static int create_directory(Item *i, const char *path) {
1601 _cleanup_close_ int fd = -1;
1602
1603 assert(i);
1604 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
1605
1606 fd = create_directory_or_subvolume(path, i->mode, false, NULL);
1607 if (fd == -EEXIST)
1608 return 0;
1609 if (fd < 0)
1610 return fd;
1611
1612 return fd_set_perms(i, fd, path, NULL);
1613 }
1614
1615 static int create_subvolume(Item *i, const char *path) {
1616 _cleanup_close_ int fd = -1;
1617 CreationMode creation;
1618 int r, q = 0;
1619
1620 assert(i);
1621 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
1622
1623 fd = create_directory_or_subvolume(path, i->mode, true, &creation);
1624 if (fd == -EEXIST)
1625 return 0;
1626 if (fd < 0)
1627 return fd;
1628
1629 if (creation == CREATION_NORMAL &&
1630 IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
1631 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
1632 if (r == -ENOTTY)
1633 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
1634 else if (r == -EROFS)
1635 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
1636 else if (r == -ENOTCONN)
1637 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
1638 else if (r < 0)
1639 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
1640 else if (r > 0)
1641 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
1642 else if (r == 0)
1643 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
1644 }
1645
1646 r = fd_set_perms(i, fd, path, NULL);
1647 if (q < 0) /* prefer the quota change error from above */
1648 return q;
1649
1650 return r;
1651 }
1652
1653 static int empty_directory(Item *i, const char *path) {
1654 int r;
1655
1656 assert(i);
1657 assert(i->type == EMPTY_DIRECTORY);
1658
1659 r = is_dir(path, false);
1660 if (r == -ENOENT) {
1661 /* Option "e" operates only on existing objects. Do not
1662 * print errors about non-existent files or directories */
1663 log_debug("Skipping missing directory: %s", path);
1664 return 0;
1665 }
1666 if (r < 0)
1667 return log_error_errno(r, "is_dir() failed on path %s: %m", path);
1668 if (r == 0)
1669 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1670 "'%s' already exists and is not a directory.",
1671 path);
1672
1673 return path_set_perms(i, path);
1674 }
1675
1676 static int create_device(Item *i, mode_t file_type) {
1677 _cleanup_close_ int dfd = -1, fd = -1;
1678 CreationMode creation;
1679 char *bn;
1680 int r;
1681
1682 assert(i);
1683 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
1684
1685 bn = basename(i->path);
1686
1687 /* Validate the path and use the returned directory fd for copying the
1688 * target so we're sure that the path can't be changed behind our
1689 * back. */
1690 dfd = path_open_parent_safe(i->path);
1691 if (dfd < 0)
1692 return dfd;
1693
1694 RUN_WITH_UMASK(0000) {
1695 mac_selinux_create_file_prepare(i->path, file_type);
1696 r = mknodat(dfd, bn, i->mode | file_type, i->major_minor);
1697 mac_selinux_create_file_clear();
1698 }
1699
1700 if (r < 0) {
1701 struct stat st;
1702
1703 if (errno == EPERM) {
1704 log_debug("We lack permissions, possibly because of cgroup configuration; "
1705 "skipping creation of device node %s.", i->path);
1706 return 0;
1707 }
1708
1709 if (errno != EEXIST)
1710 return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
1711
1712 if (fstatat(dfd, bn, &st, 0) < 0)
1713 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1714
1715 if ((st.st_mode & S_IFMT) != file_type) {
1716
1717 if (i->append_or_force) {
1718
1719 RUN_WITH_UMASK(0000) {
1720 mac_selinux_create_file_prepare(i->path, file_type);
1721 /* FIXME: need to introduce mknodat_atomic() */
1722 r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
1723 mac_selinux_create_file_clear();
1724 }
1725
1726 if (r < 0)
1727 return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
1728 creation = CREATION_FORCE;
1729 } else {
1730 log_debug("%s is not a device node.", i->path);
1731 return 0;
1732 }
1733 } else
1734 creation = CREATION_EXISTING;
1735 } else
1736 creation = CREATION_NORMAL;
1737
1738 log_debug("%s %s device node \"%s\" %u:%u.",
1739 creation_mode_verb_to_string(creation),
1740 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
1741 i->path, major(i->mode), minor(i->mode));
1742
1743 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1744 if (fd < 0)
1745 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1746
1747 return fd_set_perms(i, fd, i->path, NULL);
1748 }
1749
1750 static int create_fifo(Item *i, const char *path) {
1751 _cleanup_close_ int pfd = -1, fd = -1;
1752 CreationMode creation;
1753 struct stat st;
1754 char *bn;
1755 int r;
1756
1757 pfd = path_open_parent_safe(path);
1758 if (pfd < 0)
1759 return pfd;
1760
1761 bn = basename(path);
1762
1763 RUN_WITH_UMASK(0000) {
1764 mac_selinux_create_file_prepare(path, S_IFIFO);
1765 r = mkfifoat(pfd, bn, i->mode);
1766 mac_selinux_create_file_clear();
1767 }
1768
1769 if (r < 0) {
1770 if (errno != EEXIST)
1771 return log_error_errno(errno, "Failed to create fifo %s: %m", path);
1772
1773 if (fstatat(pfd, bn, &st, AT_SYMLINK_NOFOLLOW) < 0)
1774 return log_error_errno(errno, "stat(%s) failed: %m", path);
1775
1776 if (!S_ISFIFO(st.st_mode)) {
1777
1778 if (i->append_or_force) {
1779 RUN_WITH_UMASK(0000) {
1780 mac_selinux_create_file_prepare(path, S_IFIFO);
1781 r = mkfifoat_atomic(pfd, bn, i->mode);
1782 mac_selinux_create_file_clear();
1783 }
1784
1785 if (r < 0)
1786 return log_error_errno(r, "Failed to create fifo %s: %m", path);
1787 creation = CREATION_FORCE;
1788 } else {
1789 log_warning("\"%s\" already exists and is not a fifo.", path);
1790 return 0;
1791 }
1792 } else
1793 creation = CREATION_EXISTING;
1794 } else
1795 creation = CREATION_NORMAL;
1796
1797 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), path);
1798
1799 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1800 if (fd < 0)
1801 return log_error_errno(errno, "Failed to openat(%s): %m", path);
1802
1803 return fd_set_perms(i, fd, i->path, NULL);
1804 }
1805
1806 typedef int (*action_t)(Item *i, const char *path);
1807 typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st);
1808
1809 static int item_do(Item *i, int fd, const char *path, fdaction_t action) {
1810 struct stat st;
1811 int r = 0, q;
1812
1813 assert(i);
1814 assert(path);
1815 assert(fd >= 0);
1816
1817 if (fstat(fd, &st) < 0) {
1818 r = log_error_errno(errno, "fstat() on file failed: %m");
1819 goto finish;
1820 }
1821
1822 /* This returns the first error we run into, but nevertheless
1823 * tries to go on */
1824 r = action(i, fd, path, &st);
1825
1826 if (S_ISDIR(st.st_mode)) {
1827 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1828 _cleanup_closedir_ DIR *d = NULL;
1829 struct dirent *de;
1830
1831 /* The passed 'fd' was opened with O_PATH. We need to convert
1832 * it into a 'regular' fd before reading the directory content. */
1833 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1834
1835 d = opendir(procfs_path);
1836 if (!d) {
1837 log_error_errno(errno, "Failed to opendir() '%s': %m", procfs_path);
1838 if (r == 0)
1839 r = -errno;
1840 goto finish;
1841 }
1842
1843 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
1844 int de_fd;
1845
1846 if (dot_or_dot_dot(de->d_name))
1847 continue;
1848
1849 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1850 if (de_fd < 0)
1851 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
1852 else {
1853 _cleanup_free_ char *de_path = NULL;
1854
1855 de_path = path_join(path, de->d_name);
1856 if (!de_path)
1857 q = log_oom();
1858 else
1859 /* Pass ownership of dirent fd over */
1860 q = item_do(i, de_fd, de_path, action);
1861 }
1862
1863 if (q < 0 && r == 0)
1864 r = q;
1865 }
1866 }
1867 finish:
1868 safe_close(fd);
1869 return r;
1870 }
1871
1872 static int glob_item(Item *i, action_t action) {
1873 _cleanup_globfree_ glob_t g = {
1874 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1875 };
1876 int r = 0, k;
1877 char **fn;
1878
1879 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1880 if (k < 0 && k != -ENOENT)
1881 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1882
1883 STRV_FOREACH(fn, g.gl_pathv) {
1884 k = action(i, *fn);
1885 if (k < 0 && r == 0)
1886 r = k;
1887 }
1888
1889 return r;
1890 }
1891
1892 static int glob_item_recursively(Item *i, fdaction_t action) {
1893 _cleanup_globfree_ glob_t g = {
1894 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1895 };
1896 int r = 0, k;
1897 char **fn;
1898
1899 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1900 if (k < 0 && k != -ENOENT)
1901 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1902
1903 STRV_FOREACH(fn, g.gl_pathv) {
1904 _cleanup_close_ int fd = -1;
1905
1906 /* Make sure we won't trigger/follow file object (such as
1907 * device nodes, automounts, ...) pointed out by 'fn' with
1908 * O_PATH. Note, when O_PATH is used, flags other than
1909 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
1910
1911 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
1912 if (fd < 0) {
1913 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
1914 if (r == 0)
1915 r = -errno;
1916 continue;
1917 }
1918
1919 k = item_do(i, fd, *fn, action);
1920 if (k < 0 && r == 0)
1921 r = k;
1922
1923 /* we passed fd ownership to the previous call */
1924 fd = -1;
1925 }
1926
1927 return r;
1928 }
1929
1930 static int create_item(Item *i) {
1931 CreationMode creation;
1932 int r = 0;
1933
1934 assert(i);
1935
1936 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
1937
1938 switch (i->type) {
1939
1940 case IGNORE_PATH:
1941 case IGNORE_DIRECTORY_PATH:
1942 case REMOVE_PATH:
1943 case RECURSIVE_REMOVE_PATH:
1944 return 0;
1945
1946 case TRUNCATE_FILE:
1947 case CREATE_FILE:
1948 RUN_WITH_UMASK(0000)
1949 (void) mkdir_parents_label(i->path, 0755);
1950
1951 if ((i->type == CREATE_FILE && i->append_or_force) || i->type == TRUNCATE_FILE)
1952 r = truncate_file(i, i->path);
1953 else
1954 r = create_file(i, i->path);
1955
1956 if (r < 0)
1957 return r;
1958 break;
1959
1960 case COPY_FILES:
1961 RUN_WITH_UMASK(0000)
1962 (void) mkdir_parents_label(i->path, 0755);
1963
1964 r = copy_files(i);
1965 if (r < 0)
1966 return r;
1967 break;
1968
1969 case WRITE_FILE:
1970 r = glob_item(i, write_one_file);
1971 if (r < 0)
1972 return r;
1973
1974 break;
1975
1976 case CREATE_DIRECTORY:
1977 case TRUNCATE_DIRECTORY:
1978 RUN_WITH_UMASK(0000)
1979 (void) mkdir_parents_label(i->path, 0755);
1980
1981 r = create_directory(i, i->path);
1982 if (r < 0)
1983 return r;
1984 break;
1985
1986 case CREATE_SUBVOLUME:
1987 case CREATE_SUBVOLUME_INHERIT_QUOTA:
1988 case CREATE_SUBVOLUME_NEW_QUOTA:
1989 RUN_WITH_UMASK(0000)
1990 (void) mkdir_parents_label(i->path, 0755);
1991
1992 r = create_subvolume(i, i->path);
1993 if (r < 0)
1994 return r;
1995 break;
1996
1997 case EMPTY_DIRECTORY:
1998 r = glob_item(i, empty_directory);
1999 if (r < 0)
2000 return r;
2001 break;
2002
2003 case CREATE_FIFO:
2004 RUN_WITH_UMASK(0000)
2005 (void) mkdir_parents_label(i->path, 0755);
2006
2007 r = create_fifo(i, i->path);
2008 if (r < 0)
2009 return r;
2010 break;
2011
2012 case CREATE_SYMLINK: {
2013 RUN_WITH_UMASK(0000)
2014 (void) mkdir_parents_label(i->path, 0755);
2015
2016 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2017 r = symlink(i->argument, i->path);
2018 mac_selinux_create_file_clear();
2019
2020 if (r < 0) {
2021 _cleanup_free_ char *x = NULL;
2022
2023 if (errno != EEXIST)
2024 return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);
2025
2026 r = readlink_malloc(i->path, &x);
2027 if (r < 0 || !streq(i->argument, x)) {
2028
2029 if (i->append_or_force) {
2030 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2031 r = symlink_atomic(i->argument, i->path);
2032 mac_selinux_create_file_clear();
2033
2034 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2035 r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL);
2036 if (r < 0)
2037 return log_error_errno(r, "rm -fr %s failed: %m", i->path);
2038
2039 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2040 r = symlink(i->argument, i->path) < 0 ? -errno : 0;
2041 mac_selinux_create_file_clear();
2042 }
2043 if (r < 0)
2044 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2045
2046 creation = CREATION_FORCE;
2047 } else {
2048 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2049 return 0;
2050 }
2051 } else
2052 creation = CREATION_EXISTING;
2053 } else
2054
2055 creation = CREATION_NORMAL;
2056 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2057 break;
2058 }
2059
2060 case CREATE_BLOCK_DEVICE:
2061 case CREATE_CHAR_DEVICE:
2062 if (have_effective_cap(CAP_MKNOD) == 0) {
2063 /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
2064 * case to avoid noise, and we don't support virtualized devices in containers anyway. */
2065
2066 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2067 return 0;
2068 }
2069
2070 RUN_WITH_UMASK(0000)
2071 (void) mkdir_parents_label(i->path, 0755);
2072
2073 r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2074 if (r < 0)
2075 return r;
2076
2077 break;
2078
2079 case ADJUST_MODE:
2080 case RELABEL_PATH:
2081 r = glob_item(i, path_set_perms);
2082 if (r < 0)
2083 return r;
2084 break;
2085
2086 case RECURSIVE_RELABEL_PATH:
2087 r = glob_item_recursively(i, fd_set_perms);
2088 if (r < 0)
2089 return r;
2090 break;
2091
2092 case SET_XATTR:
2093 r = glob_item(i, path_set_xattrs);
2094 if (r < 0)
2095 return r;
2096 break;
2097
2098 case RECURSIVE_SET_XATTR:
2099 r = glob_item_recursively(i, fd_set_xattrs);
2100 if (r < 0)
2101 return r;
2102 break;
2103
2104 case SET_ACL:
2105 r = glob_item(i, path_set_acls);
2106 if (r < 0)
2107 return r;
2108 break;
2109
2110 case RECURSIVE_SET_ACL:
2111 r = glob_item_recursively(i, fd_set_acls);
2112 if (r < 0)
2113 return r;
2114 break;
2115
2116 case SET_ATTRIBUTE:
2117 r = glob_item(i, path_set_attribute);
2118 if (r < 0)
2119 return r;
2120 break;
2121
2122 case RECURSIVE_SET_ATTRIBUTE:
2123 r = glob_item_recursively(i, fd_set_attribute);
2124 if (r < 0)
2125 return r;
2126 break;
2127 }
2128
2129 return 0;
2130 }
2131
2132 static int remove_item_instance(Item *i, const char *instance) {
2133 int r;
2134
2135 assert(i);
2136
2137 switch (i->type) {
2138
2139 case REMOVE_PATH:
2140 if (remove(instance) < 0 && errno != ENOENT)
2141 return log_error_errno(errno, "rm(%s): %m", instance);
2142
2143 break;
2144
2145 case RECURSIVE_REMOVE_PATH:
2146 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2147 log_debug("rm -rf \"%s\"", instance);
2148 r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL);
2149 if (r < 0 && r != -ENOENT)
2150 return log_error_errno(r, "rm_rf(%s): %m", instance);
2151
2152 break;
2153
2154 default:
2155 assert_not_reached("wut?");
2156 }
2157
2158 return 0;
2159 }
2160
2161 static int remove_item(Item *i) {
2162 int r;
2163
2164 assert(i);
2165
2166 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
2167
2168 switch (i->type) {
2169
2170 case TRUNCATE_DIRECTORY:
2171 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2172 log_debug("rm -rf \"%s\"", i->path);
2173 r = rm_rf(i->path, REMOVE_PHYSICAL);
2174 if (r < 0 && r != -ENOENT)
2175 return log_error_errno(r, "rm_rf(%s): %m", i->path);
2176
2177 return 0;
2178
2179 case REMOVE_PATH:
2180 case RECURSIVE_REMOVE_PATH:
2181 return glob_item(i, remove_item_instance);
2182
2183 default:
2184 return 0;
2185 }
2186 }
2187
2188 static int clean_item_instance(Item *i, const char* instance) {
2189 _cleanup_closedir_ DIR *d = NULL;
2190 struct stat s, ps;
2191 bool mountpoint;
2192 usec_t cutoff, n;
2193 char timestamp[FORMAT_TIMESTAMP_MAX];
2194
2195 assert(i);
2196
2197 if (!i->age_set)
2198 return 0;
2199
2200 n = now(CLOCK_REALTIME);
2201 if (n < i->age)
2202 return 0;
2203
2204 cutoff = n - i->age;
2205
2206 d = opendir_nomod(instance);
2207 if (!d) {
2208 if (IN_SET(errno, ENOENT, ENOTDIR)) {
2209 log_debug_errno(errno, "Directory \"%s\": %m", instance);
2210 return 0;
2211 }
2212
2213 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
2214 }
2215
2216 if (fstat(dirfd(d), &s) < 0)
2217 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
2218
2219 if (!S_ISDIR(s.st_mode))
2220 return log_error_errno(SYNTHETIC_ERRNO(ENOTDIR),
2221 "%s is not a directory.", i->path);
2222
2223 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
2224 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
2225
2226 mountpoint = s.st_dev != ps.st_dev || s.st_ino == ps.st_ino;
2227
2228 log_debug("Cleanup threshold for %s \"%s\" is %s",
2229 mountpoint ? "mount point" : "directory",
2230 instance,
2231 format_timestamp_us(timestamp, sizeof(timestamp), cutoff));
2232
2233 return dir_cleanup(i, instance, d, &s, cutoff, s.st_dev, mountpoint,
2234 MAX_DEPTH, i->keep_first_level);
2235 }
2236
2237 static int clean_item(Item *i) {
2238 assert(i);
2239
2240 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
2241
2242 switch (i->type) {
2243 case CREATE_DIRECTORY:
2244 case CREATE_SUBVOLUME:
2245 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2246 case CREATE_SUBVOLUME_NEW_QUOTA:
2247 case TRUNCATE_DIRECTORY:
2248 case IGNORE_PATH:
2249 case COPY_FILES:
2250 clean_item_instance(i, i->path);
2251 return 0;
2252 case EMPTY_DIRECTORY:
2253 case IGNORE_DIRECTORY_PATH:
2254 return glob_item(i, clean_item_instance);
2255 default:
2256 return 0;
2257 }
2258 }
2259
2260 static int process_item(Item *i, OperationMask operation) {
2261 OperationMask todo;
2262 int r, q, p;
2263
2264 assert(i);
2265
2266 todo = operation & ~i->done;
2267 if (todo == 0) /* Everything already done? */
2268 return 0;
2269
2270 i->done |= operation;
2271
2272 r = chase_symlinks(i->path, arg_root, CHASE_NO_AUTOFS|CHASE_WARN, NULL, NULL);
2273 if (r == -EREMOTE) {
2274 log_notice_errno(r, "Skipping %s", i->path);
2275 return 0;
2276 }
2277 if (r < 0)
2278 log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
2279
2280 r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(i) : 0;
2281 /* Failure can only be tolerated for create */
2282 if (i->allow_failure)
2283 r = 0;
2284
2285 q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(i) : 0;
2286 p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(i) : 0;
2287
2288 return r < 0 ? r :
2289 q < 0 ? q :
2290 p;
2291 }
2292
2293 static int process_item_array(ItemArray *array, OperationMask operation) {
2294 int r = 0;
2295 size_t n;
2296
2297 assert(array);
2298
2299 /* Create any parent first. */
2300 if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
2301 r = process_item_array(array->parent, operation & OPERATION_CREATE);
2302
2303 /* Clean up all children first */
2304 if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) {
2305 Iterator i;
2306 ItemArray *c;
2307
2308 SET_FOREACH(c, array->children, i) {
2309 int k;
2310
2311 k = process_item_array(c, operation & (OPERATION_REMOVE|OPERATION_CLEAN));
2312 if (k < 0 && r == 0)
2313 r = k;
2314 }
2315 }
2316
2317 for (n = 0; n < array->n_items; n++) {
2318 int k;
2319
2320 k = process_item(array->items + n, operation);
2321 if (k < 0 && r == 0)
2322 r = k;
2323 }
2324
2325 return r;
2326 }
2327
2328 static void item_free_contents(Item *i) {
2329 assert(i);
2330 free(i->path);
2331 free(i->argument);
2332 strv_free(i->xattrs);
2333
2334 #if HAVE_ACL
2335 acl_free(i->acl_access);
2336 acl_free(i->acl_default);
2337 #endif
2338 }
2339
2340 static ItemArray* item_array_free(ItemArray *a) {
2341 size_t n;
2342
2343 if (!a)
2344 return NULL;
2345
2346 for (n = 0; n < a->n_items; n++)
2347 item_free_contents(a->items + n);
2348
2349 set_free(a->children);
2350 free(a->items);
2351 return mfree(a);
2352 }
2353
2354 static int item_compare(const Item *a, const Item *b) {
2355 /* Make sure that the ownership taking item is put first, so
2356 * that we first create the node, and then can adjust it */
2357
2358 if (takes_ownership(a->type) && !takes_ownership(b->type))
2359 return -1;
2360 if (!takes_ownership(a->type) && takes_ownership(b->type))
2361 return 1;
2362
2363 return CMP(a->type, b->type);
2364 }
2365
2366 static bool item_compatible(Item *a, Item *b) {
2367 assert(a);
2368 assert(b);
2369 assert(streq(a->path, b->path));
2370
2371 if (takes_ownership(a->type) && takes_ownership(b->type))
2372 /* check if the items are the same */
2373 return streq_ptr(a->argument, b->argument) &&
2374
2375 a->uid_set == b->uid_set &&
2376 a->uid == b->uid &&
2377
2378 a->gid_set == b->gid_set &&
2379 a->gid == b->gid &&
2380
2381 a->mode_set == b->mode_set &&
2382 a->mode == b->mode &&
2383
2384 a->age_set == b->age_set &&
2385 a->age == b->age &&
2386
2387 a->mask_perms == b->mask_perms &&
2388
2389 a->keep_first_level == b->keep_first_level &&
2390
2391 a->major_minor == b->major_minor;
2392
2393 return true;
2394 }
2395
2396 static bool should_include_path(const char *path) {
2397 char **prefix;
2398
2399 STRV_FOREACH(prefix, arg_exclude_prefixes)
2400 if (path_startswith(path, *prefix)) {
2401 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
2402 path, *prefix);
2403 return false;
2404 }
2405
2406 STRV_FOREACH(prefix, arg_include_prefixes)
2407 if (path_startswith(path, *prefix)) {
2408 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
2409 return true;
2410 }
2411
2412 /* no matches, so we should include this path only if we have no allow list at all */
2413 if (strv_isempty(arg_include_prefixes))
2414 return true;
2415
2416 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
2417 return false;
2418 }
2419
2420 static int specifier_expansion_from_arg(Item *i) {
2421 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
2422 char **xattr;
2423 int r;
2424
2425 assert(i);
2426
2427 if (!i->argument)
2428 return 0;
2429
2430 switch (i->type) {
2431 case COPY_FILES:
2432 case CREATE_SYMLINK:
2433 case CREATE_FILE:
2434 case TRUNCATE_FILE:
2435 case WRITE_FILE:
2436 r = cunescape(i->argument, 0, &unescaped);
2437 if (r < 0)
2438 return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument);
2439
2440 r = specifier_printf(unescaped, specifier_table, NULL, &resolved);
2441 if (r < 0)
2442 return r;
2443
2444 free_and_replace(i->argument, resolved);
2445 break;
2446
2447 case SET_XATTR:
2448 case RECURSIVE_SET_XATTR:
2449 STRV_FOREACH(xattr, i->xattrs) {
2450 r = specifier_printf(*xattr, specifier_table, NULL, &resolved);
2451 if (r < 0)
2452 return r;
2453
2454 free_and_replace(*xattr, resolved);
2455 }
2456 break;
2457
2458 default:
2459 break;
2460 }
2461 return 0;
2462 }
2463
2464 static int patch_var_run(const char *fname, unsigned line, char **path) {
2465 const char *k;
2466 char *n;
2467
2468 assert(path);
2469 assert(*path);
2470
2471 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
2472 * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
2473 * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
2474 * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
2475 * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
2476 * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
2477 * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
2478 * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
2479 * the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
2480
2481 k = path_startswith(*path, "/var/run/");
2482 if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
2483 return 0;
2484
2485 n = path_join("/run", k);
2486 if (!n)
2487 return log_oom();
2488
2489 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
2490 * there's no immediate need for action by the user. However, in the interest of making things less confusing
2491 * to the user, let's still inform the user that these snippets should really be updated. */
2492 log_syntax(NULL, LOG_NOTICE, fname, line, 0, "Line references path below legacy directory /var/run/, updating %s → %s; please update the tmpfiles.d/ drop-in file accordingly.", *path, n);
2493
2494 free_and_replace(*path, n);
2495
2496 return 0;
2497 }
2498
2499 static int find_uid(const char *user, uid_t *ret_uid, Hashmap **cache) {
2500 int r;
2501
2502 assert(user);
2503 assert(ret_uid);
2504
2505 /* First: parse as numeric UID string */
2506 r = parse_uid(user, ret_uid);
2507 if (r >= 0)
2508 return r;
2509
2510 /* Second: pass to NSS if we are running "online" */
2511 if (!arg_root)
2512 return get_user_creds(&user, ret_uid, NULL, NULL, NULL, 0);
2513
2514 /* Third, synthesize "root" unconditionally */
2515 if (streq(user, "root")) {
2516 *ret_uid = 0;
2517 return 0;
2518 }
2519
2520 /* Fourth: use fgetpwent() to read /etc/passwd directly, if we are "offline" */
2521 return name_to_uid_offline(arg_root, user, ret_uid, cache);
2522 }
2523
2524 static int find_gid(const char *group, gid_t *ret_gid, Hashmap **cache) {
2525 int r;
2526
2527 assert(group);
2528 assert(ret_gid);
2529
2530 /* First: parse as numeric GID string */
2531 r = parse_gid(group, ret_gid);
2532 if (r >= 0)
2533 return r;
2534
2535 /* Second: pass to NSS if we are running "online" */
2536 if (!arg_root)
2537 return get_group_creds(&group, ret_gid, 0);
2538
2539 /* Third, synthesize "root" unconditionally */
2540 if (streq(group, "root")) {
2541 *ret_gid = 0;
2542 return 0;
2543 }
2544
2545 /* Fourth: use fgetgrent() to read /etc/group directly, if we are "offline" */
2546 return name_to_gid_offline(arg_root, group, ret_gid, cache);
2547 }
2548
2549 static int parse_line(
2550 const char *fname,
2551 unsigned line,
2552 const char *buffer,
2553 bool *invalid_config,
2554 Hashmap **uid_cache,
2555 Hashmap **gid_cache) {
2556
2557 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
2558 _cleanup_(item_free_contents) Item i = {};
2559 ItemArray *existing;
2560 OrderedHashmap *h;
2561 int r, pos;
2562 bool append_or_force = false, boot = false, allow_failure = false;
2563
2564 assert(fname);
2565 assert(line >= 1);
2566 assert(buffer);
2567
2568 r = extract_many_words(
2569 &buffer,
2570 NULL,
2571 EXTRACT_UNQUOTE,
2572 &action,
2573 &path,
2574 &mode,
2575 &user,
2576 &group,
2577 &age,
2578 NULL);
2579 if (r < 0) {
2580 if (IN_SET(r, -EINVAL, -EBADSLT))
2581 /* invalid quoting and such or an unknown specifier */
2582 *invalid_config = true;
2583 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to parse line: %m");
2584 } else if (r < 2) {
2585 *invalid_config = true;
2586 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Syntax error.");
2587 }
2588
2589 if (!empty_or_dash(buffer)) {
2590 i.argument = strdup(buffer);
2591 if (!i.argument)
2592 return log_oom();
2593 }
2594
2595 if (isempty(action)) {
2596 *invalid_config = true;
2597 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Command too short '%s'.", action);
2598 }
2599
2600 for (pos = 1; action[pos]; pos++) {
2601 if (action[pos] == '!' && !boot)
2602 boot = true;
2603 else if (action[pos] == '+' && !append_or_force)
2604 append_or_force = true;
2605 else if (action[pos] == '-' && !allow_failure)
2606 allow_failure = true;
2607 else {
2608 *invalid_config = true;
2609 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Unknown modifiers in command '%s'", action);
2610 }
2611 }
2612
2613 if (boot && !arg_boot) {
2614 log_syntax(NULL, LOG_DEBUG, fname, line, 0, "Ignoring entry %s \"%s\" because --boot is not specified.", action, path);
2615 return 0;
2616 }
2617
2618 i.type = action[0];
2619 i.append_or_force = append_or_force;
2620 i.allow_failure = allow_failure;
2621
2622 r = specifier_printf(path, specifier_table, NULL, &i.path);
2623 if (r == -ENXIO)
2624 return log_unresolvable_specifier(fname, line);
2625 if (r < 0) {
2626 if (IN_SET(r, -EINVAL, -EBADSLT))
2627 *invalid_config = true;
2628 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to replace specifiers in '%s': %m", path);
2629 }
2630
2631 r = patch_var_run(fname, line, &i.path);
2632 if (r < 0)
2633 return r;
2634
2635 switch (i.type) {
2636
2637 case CREATE_DIRECTORY:
2638 case CREATE_SUBVOLUME:
2639 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2640 case CREATE_SUBVOLUME_NEW_QUOTA:
2641 case EMPTY_DIRECTORY:
2642 case TRUNCATE_DIRECTORY:
2643 case CREATE_FIFO:
2644 case IGNORE_PATH:
2645 case IGNORE_DIRECTORY_PATH:
2646 case REMOVE_PATH:
2647 case RECURSIVE_REMOVE_PATH:
2648 case ADJUST_MODE:
2649 case RELABEL_PATH:
2650 case RECURSIVE_RELABEL_PATH:
2651 if (i.argument)
2652 log_syntax(NULL, LOG_WARNING, fname, line, 0, "%c lines don't take argument fields, ignoring.", i.type);
2653
2654 break;
2655
2656 case CREATE_FILE:
2657 case TRUNCATE_FILE:
2658 break;
2659
2660 case CREATE_SYMLINK:
2661 if (!i.argument) {
2662 i.argument = path_join("/usr/share/factory", i.path);
2663 if (!i.argument)
2664 return log_oom();
2665 }
2666 break;
2667
2668 case WRITE_FILE:
2669 if (!i.argument) {
2670 *invalid_config = true;
2671 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Write file requires argument.");
2672 }
2673 break;
2674
2675 case COPY_FILES:
2676 if (!i.argument) {
2677 i.argument = path_join("/usr/share/factory", i.path);
2678 if (!i.argument)
2679 return log_oom();
2680
2681 } else if (!path_is_absolute(i.argument)) {
2682 *invalid_config = true;
2683 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Source path '%s' is not absolute.", i.argument);
2684
2685 }
2686
2687 if (!empty_or_root(arg_root)) {
2688 char *p;
2689
2690 p = path_join(arg_root, i.argument);
2691 if (!p)
2692 return log_oom();
2693 free_and_replace(i.argument, p);
2694 }
2695
2696 path_simplify(i.argument, false);
2697 break;
2698
2699 case CREATE_CHAR_DEVICE:
2700 case CREATE_BLOCK_DEVICE:
2701 if (!i.argument) {
2702 *invalid_config = true;
2703 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Device file requires argument.");
2704 }
2705
2706 r = parse_dev(i.argument, &i.major_minor);
2707 if (r < 0) {
2708 *invalid_config = true;
2709 return log_syntax(NULL, LOG_ERR, fname, line, r, "Can't parse device file major/minor '%s'.", i.argument);
2710 }
2711
2712 break;
2713
2714 case SET_XATTR:
2715 case RECURSIVE_SET_XATTR:
2716 if (!i.argument) {
2717 *invalid_config = true;
2718 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2719 "Set extended attribute requires argument.");
2720 }
2721 r = parse_xattrs_from_arg(&i);
2722 if (r < 0)
2723 return r;
2724 break;
2725
2726 case SET_ACL:
2727 case RECURSIVE_SET_ACL:
2728 if (!i.argument) {
2729 *invalid_config = true;
2730 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2731 "Set ACLs requires argument.");
2732 }
2733 r = parse_acls_from_arg(&i);
2734 if (r < 0)
2735 return r;
2736 break;
2737
2738 case SET_ATTRIBUTE:
2739 case RECURSIVE_SET_ATTRIBUTE:
2740 if (!i.argument) {
2741 *invalid_config = true;
2742 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2743 "Set file attribute requires argument.");
2744 }
2745 r = parse_attribute_from_arg(&i);
2746 if (IN_SET(r, -EINVAL, -EBADSLT))
2747 *invalid_config = true;
2748 if (r < 0)
2749 return r;
2750 break;
2751
2752 default:
2753 *invalid_config = true;
2754 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2755 "Unknown command type '%c'.", (char) i.type);
2756 }
2757
2758 if (!path_is_absolute(i.path)) {
2759 *invalid_config = true;
2760 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2761 "Path '%s' not absolute.", i.path);
2762 }
2763
2764 path_simplify(i.path, false);
2765
2766 if (!should_include_path(i.path))
2767 return 0;
2768
2769 r = specifier_expansion_from_arg(&i);
2770 if (r == -ENXIO)
2771 return log_unresolvable_specifier(fname, line);
2772 if (r < 0) {
2773 if (IN_SET(r, -EINVAL, -EBADSLT))
2774 *invalid_config = true;
2775 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to substitute specifiers in argument: %m");
2776 }
2777
2778 if (!empty_or_root(arg_root)) {
2779 char *p;
2780
2781 p = path_join(arg_root, i.path);
2782 if (!p)
2783 return log_oom();
2784 free_and_replace(i.path, p);
2785 }
2786
2787 if (!empty_or_dash(user)) {
2788 r = find_uid(user, &i.uid, uid_cache);
2789 if (r < 0) {
2790 *invalid_config = true;
2791 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve user '%s': %m", user);
2792 }
2793
2794 i.uid_set = true;
2795 }
2796
2797 if (!empty_or_dash(group)) {
2798 r = find_gid(group, &i.gid, gid_cache);
2799 if (r < 0) {
2800 *invalid_config = true;
2801 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve group '%s'.", group);
2802 }
2803
2804 i.gid_set = true;
2805 }
2806
2807 if (!empty_or_dash(mode)) {
2808 const char *mm = mode;
2809 unsigned m;
2810
2811 if (*mm == '~') {
2812 i.mask_perms = true;
2813 mm++;
2814 }
2815
2816 r = parse_mode(mm, &m);
2817 if (r < 0) {
2818 *invalid_config = true;
2819 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid mode '%s'.", mode);
2820 }
2821
2822 i.mode = m;
2823 i.mode_set = true;
2824 } else
2825 i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
2826
2827 if (!empty_or_dash(age)) {
2828 const char *a = age;
2829
2830 if (*a == '~') {
2831 i.keep_first_level = true;
2832 a++;
2833 }
2834
2835 r = parse_sec(a, &i.age);
2836 if (r < 0) {
2837 *invalid_config = true;
2838 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age '%s'.", age);
2839 }
2840
2841 i.age_set = true;
2842 }
2843
2844 h = needs_glob(i.type) ? globs : items;
2845
2846 existing = ordered_hashmap_get(h, i.path);
2847 if (existing) {
2848 size_t n;
2849
2850 for (n = 0; n < existing->n_items; n++) {
2851 if (!item_compatible(existing->items + n, &i) && !i.append_or_force) {
2852 log_syntax(NULL, LOG_NOTICE, fname, line, 0, "Duplicate line for path \"%s\", ignoring.", i.path);
2853 return 0;
2854 }
2855 }
2856 } else {
2857 existing = new0(ItemArray, 1);
2858 if (!existing)
2859 return log_oom();
2860
2861 r = ordered_hashmap_put(h, i.path, existing);
2862 if (r < 0) {
2863 free(existing);
2864 return log_oom();
2865 }
2866 }
2867
2868 if (!GREEDY_REALLOC(existing->items, existing->allocated, existing->n_items + 1))
2869 return log_oom();
2870
2871 existing->items[existing->n_items++] = i;
2872 i = (struct Item) {};
2873
2874 /* Sort item array, to enforce stable ordering of application */
2875 typesafe_qsort(existing->items, existing->n_items, item_compare);
2876
2877 return 0;
2878 }
2879
2880 static int cat_config(char **config_dirs, char **args) {
2881 _cleanup_strv_free_ char **files = NULL;
2882 int r;
2883
2884 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
2885 if (r < 0)
2886 return r;
2887
2888 return cat_files(NULL, files, 0);
2889 }
2890
2891 static int exclude_default_prefixes(void) {
2892 int r;
2893
2894 /* Provide an easy way to exclude virtual/memory file systems from what we do here. Useful in
2895 * combination with --root= where we probably don't want to apply stuff to these dirs as they are
2896 * likely over-mounted if the root directory is actually used, and it wouldbe less than ideal to have
2897 * all kinds of files created/adjusted underneath these mount points. */
2898
2899 r = strv_extend_strv(
2900 &arg_exclude_prefixes,
2901 STRV_MAKE("/dev",
2902 "/proc",
2903 "/run",
2904 "/sys"),
2905 true);
2906 if (r < 0)
2907 return log_oom();
2908
2909 return 0;
2910 }
2911
2912 static int help(void) {
2913 _cleanup_free_ char *link = NULL;
2914 int r;
2915
2916 r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
2917 if (r < 0)
2918 return log_oom();
2919
2920 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
2921 "Creates, deletes and cleans up volatile and temporary files and directories.\n\n"
2922 " -h --help Show this help\n"
2923 " --user Execute user configuration\n"
2924 " --version Show package version\n"
2925 " --cat-config Show configuration files\n"
2926 " --create Create marked files/directories\n"
2927 " --clean Clean up marked directories\n"
2928 " --remove Remove marked files/directories\n"
2929 " --boot Execute actions only safe at boot\n"
2930 " --prefix=PATH Only apply rules with the specified prefix\n"
2931 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
2932 " -E Ignore rules prefixed with /dev, /proc, /run, /sys\n"
2933 " --root=PATH Operate on an alternate filesystem root\n"
2934 " --image=PATH Operate on disk image as filesystem root\n"
2935 " --replace=PATH Treat arguments as replacement for PATH\n"
2936 " --no-pager Do not pipe output into a pager\n"
2937 "\nSee the %s for details.\n"
2938 , program_invocation_short_name
2939 , link
2940 );
2941
2942 return 0;
2943 }
2944
2945 static int parse_argv(int argc, char *argv[]) {
2946
2947 enum {
2948 ARG_VERSION = 0x100,
2949 ARG_CAT_CONFIG,
2950 ARG_USER,
2951 ARG_CREATE,
2952 ARG_CLEAN,
2953 ARG_REMOVE,
2954 ARG_BOOT,
2955 ARG_PREFIX,
2956 ARG_EXCLUDE_PREFIX,
2957 ARG_ROOT,
2958 ARG_IMAGE,
2959 ARG_REPLACE,
2960 ARG_NO_PAGER,
2961 };
2962
2963 static const struct option options[] = {
2964 { "help", no_argument, NULL, 'h' },
2965 { "user", no_argument, NULL, ARG_USER },
2966 { "version", no_argument, NULL, ARG_VERSION },
2967 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
2968 { "create", no_argument, NULL, ARG_CREATE },
2969 { "clean", no_argument, NULL, ARG_CLEAN },
2970 { "remove", no_argument, NULL, ARG_REMOVE },
2971 { "boot", no_argument, NULL, ARG_BOOT },
2972 { "prefix", required_argument, NULL, ARG_PREFIX },
2973 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
2974 { "root", required_argument, NULL, ARG_ROOT },
2975 { "image", required_argument, NULL, ARG_IMAGE },
2976 { "replace", required_argument, NULL, ARG_REPLACE },
2977 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
2978 {}
2979 };
2980
2981 int c, r;
2982
2983 assert(argc >= 0);
2984 assert(argv);
2985
2986 while ((c = getopt_long(argc, argv, "hE", options, NULL)) >= 0)
2987
2988 switch (c) {
2989
2990 case 'h':
2991 return help();
2992
2993 case ARG_VERSION:
2994 return version();
2995
2996 case ARG_CAT_CONFIG:
2997 arg_cat_config = true;
2998 break;
2999
3000 case ARG_USER:
3001 arg_user = true;
3002 break;
3003
3004 case ARG_CREATE:
3005 arg_operation |= OPERATION_CREATE;
3006 break;
3007
3008 case ARG_CLEAN:
3009 arg_operation |= OPERATION_CLEAN;
3010 break;
3011
3012 case ARG_REMOVE:
3013 arg_operation |= OPERATION_REMOVE;
3014 break;
3015
3016 case ARG_BOOT:
3017 arg_boot = true;
3018 break;
3019
3020 case ARG_PREFIX:
3021 if (strv_push(&arg_include_prefixes, optarg) < 0)
3022 return log_oom();
3023 break;
3024
3025 case ARG_EXCLUDE_PREFIX:
3026 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
3027 return log_oom();
3028 break;
3029
3030 case ARG_ROOT:
3031 r = parse_path_argument_and_warn(optarg, /* suppress_root= */ false, &arg_root);
3032 if (r < 0)
3033 return r;
3034 break;
3035
3036 case ARG_IMAGE:
3037 r = parse_path_argument_and_warn(optarg, /* suppress_root= */ false, &arg_image);
3038 if (r < 0)
3039 return r;
3040
3041 /* Imply -E here since it makes little sense to create files persistently in the /run mointpoint of a disk image */
3042 _fallthrough_;
3043
3044 case 'E':
3045 r = exclude_default_prefixes();
3046 if (r < 0)
3047 return r;
3048
3049 break;
3050
3051 case ARG_REPLACE:
3052 if (!path_is_absolute(optarg) ||
3053 !endswith(optarg, ".conf"))
3054 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3055 "The argument to --replace= must an absolute path to a config file");
3056
3057 arg_replace = optarg;
3058 break;
3059
3060 case ARG_NO_PAGER:
3061 arg_pager_flags |= PAGER_DISABLE;
3062 break;
3063
3064 case '?':
3065 return -EINVAL;
3066
3067 default:
3068 assert_not_reached("Unhandled option");
3069 }
3070
3071 if (arg_operation == 0 && !arg_cat_config)
3072 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3073 "You need to specify at least one of --clean, --create or --remove.");
3074
3075 if (arg_replace && arg_cat_config)
3076 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3077 "Option --replace= is not supported with --cat-config");
3078
3079 if (arg_replace && optind >= argc)
3080 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3081 "When --replace= is given, some configuration items must be specified");
3082
3083 if (arg_root && arg_user)
3084 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3085 "Combination of --user and --root= is not supported.");
3086
3087 if (arg_image && arg_root)
3088 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Please specify either --root= or --image=, the combination of both is not supported.");
3089
3090 return 1;
3091 }
3092
3093 static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) {
3094 _cleanup_(hashmap_freep) Hashmap *uid_cache = NULL, *gid_cache = NULL;
3095 _cleanup_fclose_ FILE *_f = NULL;
3096 Iterator iterator;
3097 unsigned v = 0;
3098 FILE *f;
3099 Item *i;
3100 int r = 0;
3101
3102 assert(fn);
3103
3104 if (streq(fn, "-")) {
3105 log_debug("Reading config from stdin…");
3106 fn = "<stdin>";
3107 f = stdin;
3108 } else {
3109 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f);
3110 if (r < 0) {
3111 if (ignore_enoent && r == -ENOENT) {
3112 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
3113 return 0;
3114 }
3115
3116 return log_error_errno(r, "Failed to open '%s': %m", fn);
3117 }
3118 log_debug("Reading config file \"%s\"…", fn);
3119 f = _f;
3120 }
3121
3122 for (;;) {
3123 _cleanup_free_ char *line = NULL;
3124 bool invalid_line = false;
3125 char *l;
3126 int k;
3127
3128 k = read_line(f, LONG_LINE_MAX, &line);
3129 if (k < 0)
3130 return log_error_errno(k, "Failed to read '%s': %m", fn);
3131 if (k == 0)
3132 break;
3133
3134 v++;
3135
3136 l = strstrip(line);
3137 if (IN_SET(*l, 0, '#'))
3138 continue;
3139
3140 k = parse_line(fn, v, l, &invalid_line, &uid_cache, &gid_cache);
3141 if (k < 0) {
3142 if (invalid_line)
3143 /* Allow reporting with a special code if the caller requested this */
3144 *invalid_config = true;
3145 else if (r == 0)
3146 /* The first error becomes our return value */
3147 r = k;
3148 }
3149 }
3150
3151 /* we have to determine age parameter for each entry of type X */
3152 ORDERED_HASHMAP_FOREACH(i, globs, iterator) {
3153 Iterator iter;
3154 Item *j, *candidate_item = NULL;
3155
3156 if (i->type != IGNORE_DIRECTORY_PATH)
3157 continue;
3158
3159 ORDERED_HASHMAP_FOREACH(j, items, iter) {
3160 if (!IN_SET(j->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA))
3161 continue;
3162
3163 if (path_equal(j->path, i->path)) {
3164 candidate_item = j;
3165 break;
3166 }
3167
3168 if ((!candidate_item && path_startswith(i->path, j->path)) ||
3169 (candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)))
3170 candidate_item = j;
3171 }
3172
3173 if (candidate_item && candidate_item->age_set) {
3174 i->age = candidate_item->age;
3175 i->age_set = true;
3176 }
3177 }
3178
3179 if (ferror(f)) {
3180 log_error_errno(errno, "Failed to read from file %s: %m", fn);
3181 if (r == 0)
3182 r = -EIO;
3183 }
3184
3185 return r;
3186 }
3187
3188 static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
3189 char **arg;
3190 int r;
3191
3192 STRV_FOREACH(arg, args) {
3193 r = read_config_file(config_dirs, *arg, false, invalid_config);
3194 if (r < 0)
3195 return r;
3196 }
3197
3198 return 0;
3199 }
3200
3201 static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
3202 _cleanup_strv_free_ char **files = NULL;
3203 _cleanup_free_ char *p = NULL;
3204 char **f;
3205 int r;
3206
3207 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
3208 if (r < 0)
3209 return r;
3210
3211 STRV_FOREACH(f, files)
3212 if (p && path_equal(*f, p)) {
3213 log_debug("Parsing arguments at position \"%s\"…", *f);
3214
3215 r = parse_arguments(config_dirs, args, invalid_config);
3216 if (r < 0)
3217 return r;
3218 } else
3219 /* Just warn, ignore result otherwise.
3220 * read_config_file() has some debug output, so no need to print anything. */
3221 (void) read_config_file(config_dirs, *f, true, invalid_config);
3222
3223 return 0;
3224 }
3225
3226 static int link_parent(ItemArray *a) {
3227 const char *path;
3228 char *prefix;
3229 int r;
3230
3231 assert(a);
3232
3233 /* Finds the closest "parent" item array for the specified item array. Then registers the specified item array
3234 * as child of it, and fills the parent in, linking them both ways. This allows us to later create parents
3235 * before their children, and clean up/remove children before their parents. */
3236
3237 if (a->n_items <= 0)
3238 return 0;
3239
3240 path = a->items[0].path;
3241 prefix = newa(char, strlen(path) + 1);
3242 PATH_FOREACH_PREFIX(prefix, path) {
3243 ItemArray *j;
3244
3245 j = ordered_hashmap_get(items, prefix);
3246 if (!j)
3247 j = ordered_hashmap_get(globs, prefix);
3248 if (j) {
3249 r = set_ensure_put(&j->children, NULL, a);
3250 if (r < 0)
3251 return log_oom();
3252
3253 a->parent = j;
3254 return 1;
3255 }
3256 }
3257
3258 return 0;
3259 }
3260
3261 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
3262 ItemArray, item_array_free);
3263
3264 static int run(int argc, char *argv[]) {
3265 _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL;
3266 _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL;
3267 _cleanup_(umount_and_rmdir_and_freep) char *unlink_dir = NULL;
3268 _cleanup_strv_free_ char **config_dirs = NULL;
3269 bool invalid_config = false;
3270 Iterator iterator;
3271 ItemArray *a;
3272 enum {
3273 PHASE_REMOVE_AND_CLEAN,
3274 PHASE_CREATE,
3275 _PHASE_MAX
3276 } phase;
3277 int r, k;
3278
3279 r = parse_argv(argc, argv);
3280 if (r <= 0)
3281 return r;
3282
3283 log_setup_service();
3284
3285 /* Descending down file system trees might take a lot of fds */
3286 (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
3287
3288 if (arg_user) {
3289 r = user_config_paths(&config_dirs);
3290 if (r < 0)
3291 return log_error_errno(r, "Failed to initialize configuration directory list: %m");
3292 } else {
3293 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
3294 if (!config_dirs)
3295 return log_oom();
3296 }
3297
3298 if (DEBUG_LOGGING) {
3299 _cleanup_free_ char *t = NULL;
3300 char **i;
3301
3302 STRV_FOREACH(i, config_dirs) {
3303 _cleanup_free_ char *j = NULL;
3304
3305 j = path_join(arg_root, *i);
3306 if (!j)
3307 return log_oom();
3308
3309 if (!strextend(&t, "\n\t", j, NULL))
3310 return log_oom();
3311 }
3312
3313 log_debug("Looking for configuration files in (higher priority first):%s", t);
3314 }
3315
3316 if (arg_cat_config) {
3317 (void) pager_open(arg_pager_flags);
3318
3319 return cat_config(config_dirs, argv + optind);
3320 }
3321
3322 umask(0022);
3323
3324 r = mac_selinux_init();
3325 if (r < 0)
3326 return r;
3327
3328 if (arg_image) {
3329 assert(!arg_root);
3330
3331 r = mount_image_privately_interactively(
3332 arg_image,
3333 DISSECT_IMAGE_REQUIRE_ROOT|DISSECT_IMAGE_VALIDATE_OS|DISSECT_IMAGE_RELAX_VAR_CHECK|DISSECT_IMAGE_FSCK,
3334 &unlink_dir,
3335 &loop_device,
3336 &decrypted_image);
3337 if (r < 0)
3338 return r;
3339
3340 arg_root = strdup(unlink_dir);
3341 if (!arg_root)
3342 return log_oom();
3343 }
3344
3345 items = ordered_hashmap_new(&item_array_hash_ops);
3346 globs = ordered_hashmap_new(&item_array_hash_ops);
3347 if (!items || !globs)
3348 return log_oom();
3349
3350 /* If command line arguments are specified along with --replace, read all
3351 * configuration files and insert the positional arguments at the specified
3352 * place. Otherwise, if command line arguments are specified, execute just
3353 * them, and finally, without --replace= or any positional arguments, just
3354 * read configuration and execute it.
3355 */
3356 if (arg_replace || optind >= argc)
3357 r = read_config_files(config_dirs, argv + optind, &invalid_config);
3358 else
3359 r = parse_arguments(config_dirs, argv + optind, &invalid_config);
3360 if (r < 0)
3361 return r;
3362
3363 /* Let's now link up all child/parent relationships */
3364 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3365 r = link_parent(a);
3366 if (r < 0)
3367 return r;
3368 }
3369 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3370 r = link_parent(a);
3371 if (r < 0)
3372 return r;
3373 }
3374
3375 /* If multiple operations are requested, let's first run the remove/clean operations, and only then the create
3376 * operations. i.e. that we first clean out the platform we then build on. */
3377 for (phase = 0; phase < _PHASE_MAX; phase++) {
3378 OperationMask op;
3379
3380 if (phase == PHASE_REMOVE_AND_CLEAN)
3381 op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
3382 else if (phase == PHASE_CREATE)
3383 op = arg_operation & OPERATION_CREATE;
3384 else
3385 assert_not_reached("unexpected phase");
3386
3387 if (op == 0) /* Nothing requested in this phase */
3388 continue;
3389
3390 /* The non-globbing ones usually create things, hence we apply them first */
3391 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3392 k = process_item_array(a, op);
3393 if (k < 0 && r >= 0)
3394 r = k;
3395 }
3396
3397 /* The globbing ones usually alter things, hence we apply them second. */
3398 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3399 k = process_item_array(a, op);
3400 if (k < 0 && r >= 0)
3401 r = k;
3402 }
3403 }
3404
3405 if (ERRNO_IS_RESOURCE(-r))
3406 return r;
3407 if (invalid_config)
3408 return EX_DATAERR;
3409 if (r < 0)
3410 return EX_CANTCREAT;
3411 return 0;
3412 }
3413
3414 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
Unnamed repository; edit this file 'description' to name the repository.