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