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Merge pull request #12392 from poettering/firstboot-salt
[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 <string.h>
15 #include <sys/file.h>
16 #include <sys/stat.h>
17 #include <sys/xattr.h>
18 #include <sysexits.h>
19 #include <time.h>
20 #include <unistd.h>
21
22 #include "sd-path.h"
23
24 #include "acl-util.h"
25 #include "alloc-util.h"
26 #include "btrfs-util.h"
27 #include "capability-util.h"
28 #include "chattr-util.h"
29 #include "conf-files.h"
30 #include "copy.h"
31 #include "def.h"
32 #include "dirent-util.h"
33 #include "escape.h"
34 #include "fd-util.h"
35 #include "fileio.h"
36 #include "format-util.h"
37 #include "fs-util.h"
38 #include "glob-util.h"
39 #include "io-util.h"
40 #include "label.h"
41 #include "log.h"
42 #include "macro.h"
43 #include "main-func.h"
44 #include "missing.h"
45 #include "mkdir.h"
46 #include "mountpoint-util.h"
47 #include "pager.h"
48 #include "parse-util.h"
49 #include "path-lookup.h"
50 #include "path-util.h"
51 #include "pretty-print.h"
52 #include "rlimit-util.h"
53 #include "rm-rf.h"
54 #include "selinux-util.h"
55 #include "set.h"
56 #include "sort-util.h"
57 #include "specifier.h"
58 #include "stat-util.h"
59 #include "stdio-util.h"
60 #include "string-table.h"
61 #include "string-util.h"
62 #include "strv.h"
63 #include "umask-util.h"
64 #include "user-util.h"
65
66 /* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
67 * them in the file system. This is intended to be used to create
68 * properly owned directories beneath /tmp, /var/tmp, /run, which are
69 * volatile and hence need to be recreated on bootup. */
70
71 typedef enum OperationMask {
72 OPERATION_CREATE = 1 << 0,
73 OPERATION_REMOVE = 1 << 1,
74 OPERATION_CLEAN = 1 << 2,
75 } OperationMask;
76
77 typedef enum ItemType {
78 /* These ones take file names */
79 CREATE_FILE = 'f',
80 TRUNCATE_FILE = 'F',
81 CREATE_DIRECTORY = 'd',
82 TRUNCATE_DIRECTORY = 'D',
83 CREATE_SUBVOLUME = 'v',
84 CREATE_SUBVOLUME_INHERIT_QUOTA = 'q',
85 CREATE_SUBVOLUME_NEW_QUOTA = 'Q',
86 CREATE_FIFO = 'p',
87 CREATE_SYMLINK = 'L',
88 CREATE_CHAR_DEVICE = 'c',
89 CREATE_BLOCK_DEVICE = 'b',
90 COPY_FILES = 'C',
91
92 /* These ones take globs */
93 WRITE_FILE = 'w',
94 EMPTY_DIRECTORY = 'e',
95 SET_XATTR = 't',
96 RECURSIVE_SET_XATTR = 'T',
97 SET_ACL = 'a',
98 RECURSIVE_SET_ACL = 'A',
99 SET_ATTRIBUTE = 'h',
100 RECURSIVE_SET_ATTRIBUTE = 'H',
101 IGNORE_PATH = 'x',
102 IGNORE_DIRECTORY_PATH = 'X',
103 REMOVE_PATH = 'r',
104 RECURSIVE_REMOVE_PATH = 'R',
105 RELABEL_PATH = 'z',
106 RECURSIVE_RELABEL_PATH = 'Z',
107 ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
108 } ItemType;
109
110 typedef struct Item {
111 ItemType type;
112
113 char *path;
114 char *argument;
115 char **xattrs;
116 #if HAVE_ACL
117 acl_t acl_access;
118 acl_t acl_default;
119 #endif
120 uid_t uid;
121 gid_t gid;
122 mode_t mode;
123 usec_t age;
124
125 dev_t major_minor;
126 unsigned attribute_value;
127 unsigned attribute_mask;
128
129 bool uid_set:1;
130 bool gid_set:1;
131 bool mode_set:1;
132 bool age_set:1;
133 bool mask_perms:1;
134 bool attribute_set:1;
135
136 bool keep_first_level:1;
137
138 bool force:1;
139
140 bool allow_failure:1;
141
142 OperationMask done;
143 } Item;
144
145 typedef struct ItemArray {
146 Item *items;
147 size_t n_items;
148 size_t allocated;
149
150 struct ItemArray *parent;
151 Set *children;
152 } ItemArray;
153
154 typedef enum DirectoryType {
155 DIRECTORY_RUNTIME,
156 DIRECTORY_STATE,
157 DIRECTORY_CACHE,
158 DIRECTORY_LOGS,
159 _DIRECTORY_TYPE_MAX,
160 } DirectoryType;
161
162 static bool arg_cat_config = false;
163 static bool arg_user = false;
164 static OperationMask arg_operation = 0;
165 static bool arg_boot = false;
166 static PagerFlags arg_pager_flags = 0;
167
168 static char **arg_include_prefixes = NULL;
169 static char **arg_exclude_prefixes = NULL;
170 static char *arg_root = NULL;
171 static char *arg_replace = NULL;
172
173 #define MAX_DEPTH 256
174
175 static OrderedHashmap *items = NULL, *globs = NULL;
176 static Set *unix_sockets = NULL;
177
178 STATIC_DESTRUCTOR_REGISTER(items, ordered_hashmap_freep);
179 STATIC_DESTRUCTOR_REGISTER(globs, ordered_hashmap_freep);
180 STATIC_DESTRUCTOR_REGISTER(unix_sockets, set_free_freep);
181 STATIC_DESTRUCTOR_REGISTER(arg_include_prefixes, freep);
182 STATIC_DESTRUCTOR_REGISTER(arg_exclude_prefixes, freep);
183 STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
184
185 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret);
186 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret);
187
188 static const Specifier specifier_table[] = {
189 { 'm', specifier_machine_id_safe, NULL },
190 { 'b', specifier_boot_id, NULL },
191 { 'H', specifier_host_name, NULL },
192 { 'v', specifier_kernel_release, NULL },
193
194 { 'g', specifier_group_name, NULL },
195 { 'G', specifier_group_id, NULL },
196 { 'U', specifier_user_id, NULL },
197 { 'u', specifier_user_name, NULL },
198 { 'h', specifier_user_home, NULL },
199
200 { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
201 { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
202 { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
203 { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
204 { 'T', specifier_tmp_dir, NULL },
205 { 'V', specifier_var_tmp_dir, NULL },
206 {}
207 };
208
209 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret) {
210 int r;
211
212 /* If /etc/machine_id is missing or empty (e.g. in a chroot environment)
213 * return a recognizable error so that the caller can skip the rule
214 * gracefully. */
215
216 r = specifier_machine_id(specifier, data, userdata, ret);
217 if (IN_SET(r, -ENOENT, -ENOMEDIUM))
218 return -ENXIO;
219
220 return r;
221 }
222
223 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret) {
224 struct table_entry {
225 uint64_t type;
226 const char *suffix;
227 };
228
229 static const struct table_entry paths_system[] = {
230 [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
231 [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
232 [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
233 [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
234 };
235
236 static const struct table_entry paths_user[] = {
237 [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
238 [DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION },
239 [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
240 [DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
241 };
242
243 unsigned i;
244 const struct table_entry *paths;
245
246 assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
247 paths = arg_user ? paths_user : paths_system;
248
249 i = PTR_TO_UINT(data);
250 assert(i < ELEMENTSOF(paths_system));
251
252 return sd_path_home(paths[i].type, paths[i].suffix, ret);
253 }
254
255 static int log_unresolvable_specifier(const char *filename, unsigned line) {
256 static bool notified = false;
257
258 /* In system mode, this is called when /etc is not fully initialized (e.g.
259 * in a chroot environment) where some specifiers are unresolvable. In user
260 * mode, this is called when some variables are not defined. These cases are
261 * not considered as an error so log at LOG_NOTICE only for the first time
262 * and then downgrade this to LOG_DEBUG for the rest. */
263
264 log_full(notified ? LOG_DEBUG : LOG_NOTICE,
265 "[%s:%u] Failed to resolve specifier: %s, skipping",
266 filename, line,
267 arg_user ? "Required $XDG_... variable not defined" : "uninitialized /etc detected");
268
269 if (!notified)
270 log_notice("All rules containing unresolvable specifiers will be skipped.");
271
272 notified = true;
273 return 0;
274 }
275
276 static int user_config_paths(char*** ret) {
277 _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
278 _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
279 _cleanup_strv_free_ char **res = NULL;
280 int r;
281
282 r = xdg_user_dirs(&config_dirs, &data_dirs);
283 if (r < 0)
284 return r;
285
286 r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
287 if (r < 0 && r != -ENXIO)
288 return r;
289
290 r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
291 if (r < 0 && r != -ENXIO)
292 return r;
293
294 r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
295 if (r < 0 && r != -ENXIO)
296 return r;
297
298 r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
299 if (r < 0)
300 return r;
301
302 r = strv_extend(&res, persistent_config);
303 if (r < 0)
304 return r;
305
306 r = strv_extend(&res, runtime_config);
307 if (r < 0)
308 return r;
309
310 r = strv_extend(&res, data_home);
311 if (r < 0)
312 return r;
313
314 r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
315 if (r < 0)
316 return r;
317
318 r = path_strv_make_absolute_cwd(res);
319 if (r < 0)
320 return r;
321
322 *ret = TAKE_PTR(res);
323 return 0;
324 }
325
326 static bool needs_glob(ItemType t) {
327 return IN_SET(t,
328 WRITE_FILE,
329 IGNORE_PATH,
330 IGNORE_DIRECTORY_PATH,
331 REMOVE_PATH,
332 RECURSIVE_REMOVE_PATH,
333 EMPTY_DIRECTORY,
334 ADJUST_MODE,
335 RELABEL_PATH,
336 RECURSIVE_RELABEL_PATH,
337 SET_XATTR,
338 RECURSIVE_SET_XATTR,
339 SET_ACL,
340 RECURSIVE_SET_ACL,
341 SET_ATTRIBUTE,
342 RECURSIVE_SET_ATTRIBUTE);
343 }
344
345 static bool takes_ownership(ItemType t) {
346 return IN_SET(t,
347 CREATE_FILE,
348 TRUNCATE_FILE,
349 CREATE_DIRECTORY,
350 EMPTY_DIRECTORY,
351 TRUNCATE_DIRECTORY,
352 CREATE_SUBVOLUME,
353 CREATE_SUBVOLUME_INHERIT_QUOTA,
354 CREATE_SUBVOLUME_NEW_QUOTA,
355 CREATE_FIFO,
356 CREATE_SYMLINK,
357 CREATE_CHAR_DEVICE,
358 CREATE_BLOCK_DEVICE,
359 COPY_FILES,
360 WRITE_FILE,
361 IGNORE_PATH,
362 IGNORE_DIRECTORY_PATH,
363 REMOVE_PATH,
364 RECURSIVE_REMOVE_PATH);
365 }
366
367 static struct Item* find_glob(OrderedHashmap *h, const char *match) {
368 ItemArray *j;
369 Iterator i;
370
371 ORDERED_HASHMAP_FOREACH(j, h, i) {
372 size_t n;
373
374 for (n = 0; n < j->n_items; n++) {
375 Item *item = j->items + n;
376
377 if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
378 return item;
379 }
380 }
381
382 return NULL;
383 }
384
385 static int load_unix_sockets(void) {
386 _cleanup_set_free_free_ Set *sockets = NULL;
387 _cleanup_fclose_ FILE *f = NULL;
388 int r;
389
390 if (unix_sockets)
391 return 0;
392
393 /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
394
395 sockets = set_new(&path_hash_ops);
396 if (!sockets)
397 return log_oom();
398
399 f = fopen("/proc/net/unix", "re");
400 if (!f)
401 return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
402 "Failed to open /proc/net/unix, ignoring: %m");
403
404 /* Skip header */
405 r = read_line(f, LONG_LINE_MAX, NULL);
406 if (r < 0)
407 return log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
408 if (r == 0)
409 return log_warning_errno(SYNTHETIC_ERRNO(EIO), "Premature end of file reading /proc/net/unix.");
410
411 for (;;) {
412 _cleanup_free_ char *line = NULL, *s = NULL;
413 char *p;
414
415 r = read_line(f, LONG_LINE_MAX, &line);
416 if (r < 0)
417 return log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
418 if (r == 0) /* EOF */
419 break;
420
421 p = strchr(line, ':');
422 if (!p)
423 continue;
424
425 if (strlen(p) < 37)
426 continue;
427
428 p += 37;
429 p += strspn(p, WHITESPACE);
430 p += strcspn(p, WHITESPACE); /* skip one more word */
431 p += strspn(p, WHITESPACE);
432
433 if (*p != '/')
434 continue;
435
436 s = strdup(p);
437 if (!s)
438 return log_oom();
439
440 path_simplify(s, false);
441
442 r = set_consume(sockets, s);
443 if (r == -EEXIST)
444 continue;
445 if (r < 0)
446 return log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
447
448 TAKE_PTR(s);
449 }
450
451 unix_sockets = TAKE_PTR(sockets);
452 return 1;
453 }
454
455 static bool unix_socket_alive(const char *fn) {
456 assert(fn);
457
458 if (load_unix_sockets() < 0)
459 return true; /* We don't know, so assume yes */
460
461 return !!set_get(unix_sockets, (char*) fn);
462 }
463
464 static int dir_is_mount_point(DIR *d, const char *subdir) {
465
466 int mount_id_parent, mount_id;
467 int r_p, r;
468
469 r_p = name_to_handle_at_loop(dirfd(d), ".", NULL, &mount_id_parent, 0);
470 if (r_p < 0)
471 r_p = -errno;
472
473 r = name_to_handle_at_loop(dirfd(d), subdir, NULL, &mount_id, 0);
474 if (r < 0)
475 r = -errno;
476
477 /* got no handle; make no assumptions, return error */
478 if (r_p < 0 && r < 0)
479 return r_p;
480
481 /* got both handles; if they differ, it is a mount point */
482 if (r_p >= 0 && r >= 0)
483 return mount_id_parent != mount_id;
484
485 /* got only one handle; assume different mount points if one
486 * of both queries was not supported by the filesystem */
487 if (IN_SET(r_p, -ENOSYS, -EOPNOTSUPP) || IN_SET(r, -ENOSYS, -EOPNOTSUPP))
488 return true;
489
490 /* return error */
491 if (r_p < 0)
492 return r_p;
493 return r;
494 }
495
496 static DIR* xopendirat_nomod(int dirfd, const char *path) {
497 DIR *dir;
498
499 dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
500 if (dir)
501 return dir;
502
503 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
504 if (errno != EPERM)
505 return NULL;
506
507 dir = xopendirat(dirfd, path, O_NOFOLLOW);
508 if (!dir)
509 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
510
511 return dir;
512 }
513
514 static DIR* opendir_nomod(const char *path) {
515 return xopendirat_nomod(AT_FDCWD, path);
516 }
517
518 static int dir_cleanup(
519 Item *i,
520 const char *p,
521 DIR *d,
522 const struct stat *ds,
523 usec_t cutoff,
524 dev_t rootdev,
525 bool mountpoint,
526 int maxdepth,
527 bool keep_this_level) {
528
529 struct dirent *dent;
530 bool deleted = false;
531 int r = 0;
532
533 FOREACH_DIRENT_ALL(dent, d, break) {
534 struct stat s;
535 usec_t age;
536 _cleanup_free_ char *sub_path = NULL;
537
538 if (dot_or_dot_dot(dent->d_name))
539 continue;
540
541 if (fstatat(dirfd(d), dent->d_name, &s, AT_SYMLINK_NOFOLLOW) < 0) {
542 if (errno == ENOENT)
543 continue;
544
545 /* FUSE, NFS mounts, SELinux might return EACCES */
546 r = log_full_errno(errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
547 "stat(%s/%s) failed: %m", p, dent->d_name);
548 continue;
549 }
550
551 /* Stay on the same filesystem */
552 if (s.st_dev != rootdev) {
553 log_debug("Ignoring \"%s/%s\": different filesystem.", p, dent->d_name);
554 continue;
555 }
556
557 /* Try to detect bind mounts of the same filesystem instance; they
558 * do not differ in device major/minors. This type of query is not
559 * supported on all kernels or filesystem types though. */
560 if (S_ISDIR(s.st_mode) && dir_is_mount_point(d, dent->d_name) > 0) {
561 log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.",
562 p, dent->d_name);
563 continue;
564 }
565
566 sub_path = strjoin(p, "/", dent->d_name);
567 if (!sub_path) {
568 r = log_oom();
569 goto finish;
570 }
571
572 /* Is there an item configured for this path? */
573 if (ordered_hashmap_get(items, sub_path)) {
574 log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
575 continue;
576 }
577
578 if (find_glob(globs, sub_path)) {
579 log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
580 continue;
581 }
582
583 if (S_ISDIR(s.st_mode)) {
584 _cleanup_closedir_ DIR *sub_dir = NULL;
585
586 if (mountpoint &&
587 streq(dent->d_name, "lost+found") &&
588 s.st_uid == 0) {
589 log_debug("Ignoring directory \"%s\".", sub_path);
590 continue;
591 }
592
593 if (maxdepth <= 0)
594 log_warning("Reached max depth on \"%s\".", sub_path);
595 else {
596 int q;
597
598 sub_dir = xopendirat_nomod(dirfd(d), dent->d_name);
599 if (!sub_dir) {
600 if (errno != ENOENT)
601 r = log_warning_errno(errno, "Opening directory \"%s\" failed, ignoring: %m", sub_path);
602
603 continue;
604 }
605
606 if (flock(dirfd(sub_dir), LOCK_EX|LOCK_NB) < 0) {
607 log_debug_errno(errno, "Couldn't acquire shared BSD lock on directory \"%s\", skipping: %m", p);
608 continue;
609 }
610
611 q = dir_cleanup(i, sub_path, sub_dir, &s, cutoff, rootdev, false, maxdepth-1, false);
612 if (q < 0)
613 r = q;
614 }
615
616 /* Note: if you are wondering why we don't support the sticky bit for excluding
617 * directories from cleaning like we do it for other file system objects: well, the
618 * sticky bit already has a meaning for directories, so we don't want to overload
619 * that. */
620
621 if (keep_this_level) {
622 log_debug("Keeping directory \"%s\".", sub_path);
623 continue;
624 }
625
626 /* Ignore ctime, we change it when deleting */
627 age = timespec_load(&s.st_mtim);
628 if (age >= cutoff) {
629 char a[FORMAT_TIMESTAMP_MAX];
630 /* Follows spelling in stat(1). */
631 log_debug("Directory \"%s\": modify time %s is too new.",
632 sub_path,
633 format_timestamp_us(a, sizeof(a), age));
634 continue;
635 }
636
637 age = timespec_load(&s.st_atim);
638 if (age >= cutoff) {
639 char a[FORMAT_TIMESTAMP_MAX];
640 log_debug("Directory \"%s\": access time %s is too new.",
641 sub_path,
642 format_timestamp_us(a, sizeof(a), age));
643 continue;
644 }
645
646 log_debug("Removing directory \"%s\".", sub_path);
647 if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0)
648 if (!IN_SET(errno, ENOENT, ENOTEMPTY))
649 r = log_warning_errno(errno, "Failed to remove directory \"%s\", ignoring: %m", sub_path);
650
651 } else {
652 /* Skip files for which the sticky bit is set. These are semantics we define, and are
653 * unknown elsewhere. See XDG_RUNTIME_DIR specification for details. */
654 if (s.st_mode & S_ISVTX) {
655 log_debug("Skipping \"%s\": sticky bit set.", sub_path);
656 continue;
657 }
658
659 if (mountpoint && S_ISREG(s.st_mode))
660 if (s.st_uid == 0 && STR_IN_SET(dent->d_name,
661 ".journal",
662 "aquota.user",
663 "aquota.group")) {
664 log_debug("Skipping \"%s\".", sub_path);
665 continue;
666 }
667
668 /* Ignore sockets that are listed in /proc/net/unix */
669 if (S_ISSOCK(s.st_mode) && unix_socket_alive(sub_path)) {
670 log_debug("Skipping \"%s\": live socket.", sub_path);
671 continue;
672 }
673
674 /* Ignore device nodes */
675 if (S_ISCHR(s.st_mode) || S_ISBLK(s.st_mode)) {
676 log_debug("Skipping \"%s\": a device.", sub_path);
677 continue;
678 }
679
680 /* Keep files on this level around if this is requested */
681 if (keep_this_level) {
682 log_debug("Keeping \"%s\".", sub_path);
683 continue;
684 }
685
686 age = timespec_load(&s.st_mtim);
687 if (age >= cutoff) {
688 char a[FORMAT_TIMESTAMP_MAX];
689 /* Follows spelling in stat(1). */
690 log_debug("File \"%s\": modify time %s is too new.",
691 sub_path,
692 format_timestamp_us(a, sizeof(a), age));
693 continue;
694 }
695
696 age = timespec_load(&s.st_atim);
697 if (age >= cutoff) {
698 char a[FORMAT_TIMESTAMP_MAX];
699 log_debug("File \"%s\": access time %s is too new.",
700 sub_path,
701 format_timestamp_us(a, sizeof(a), age));
702 continue;
703 }
704
705 age = timespec_load(&s.st_ctim);
706 if (age >= cutoff) {
707 char a[FORMAT_TIMESTAMP_MAX];
708 log_debug("File \"%s\": change time %s is too new.",
709 sub_path,
710 format_timestamp_us(a, sizeof(a), age));
711 continue;
712 }
713
714 log_debug("Removing \"%s\".", sub_path);
715 if (unlinkat(dirfd(d), dent->d_name, 0) < 0)
716 if (errno != ENOENT)
717 r = log_warning_errno(errno, "Failed to remove \"%s\", ignoring: %m", sub_path);
718
719 deleted = true;
720 }
721 }
722
723 finish:
724 if (deleted) {
725 char a[FORMAT_TIMESTAMP_MAX], b[FORMAT_TIMESTAMP_MAX];
726 usec_t age1, age2;
727
728 age1 = timespec_load(&ds->st_atim);
729 age2 = timespec_load(&ds->st_mtim);
730
731 log_debug("Restoring access and modification time on \"%s\": %s, %s",
732 p,
733 format_timestamp_us(a, sizeof(a), age1),
734 format_timestamp_us(b, sizeof(b), age2));
735
736 /* Restore original directory timestamps */
737 if (futimens(dirfd(d), (struct timespec[]) {
738 ds->st_atim,
739 ds->st_mtim }) < 0)
740 log_warning_errno(errno, "Failed to revert timestamps of '%s', ignoring: %m", p);
741 }
742
743 return r;
744 }
745
746 static bool dangerous_hardlinks(void) {
747 _cleanup_free_ char *value = NULL;
748 static int cached = -1;
749 int r;
750
751 /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
752 * what the upstream default is. */
753
754 if (cached >= 0)
755 return cached;
756
757 r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
758 if (r < 0) {
759 log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
760 return true;
761 }
762
763 r = parse_boolean(value);
764 if (r < 0) {
765 log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
766 return true;
767 }
768
769 cached = r == 0;
770 return cached;
771 }
772
773 static bool hardlink_vulnerable(const struct stat *st) {
774 assert(st);
775
776 return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
777 }
778
779 static mode_t process_mask_perms(mode_t mode, mode_t current) {
780
781 if ((current & 0111) == 0)
782 mode &= ~0111;
783 if ((current & 0222) == 0)
784 mode &= ~0222;
785 if ((current & 0444) == 0)
786 mode &= ~0444;
787 if (!S_ISDIR(current))
788 mode &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
789
790 return mode;
791 }
792
793 static int fd_set_perms(Item *i, int fd, const char *path, const struct stat *st) {
794 struct stat stbuf;
795 mode_t new_mode;
796 bool do_chown;
797
798 assert(i);
799 assert(fd);
800 assert(path);
801
802 if (!i->mode_set && !i->uid_set && !i->gid_set)
803 goto shortcut;
804
805 if (!st) {
806 if (fstat(fd, &stbuf) < 0)
807 return log_error_errno(errno, "fstat(%s) failed: %m", path);
808 st = &stbuf;
809 }
810
811 if (hardlink_vulnerable(st))
812 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
813 "Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
814 path);
815
816 /* Do we need a chown()? */
817 do_chown =
818 (i->uid_set && i->uid != st->st_uid) ||
819 (i->gid_set && i->gid != st->st_gid);
820
821 /* Calculate the mode to apply */
822 new_mode = i->mode_set ? (i->mask_perms ?
823 process_mask_perms(i->mode, st->st_mode) :
824 i->mode) :
825 (st->st_mode & 07777);
826
827 if (i->mode_set && do_chown) {
828 /* Before we issue the chmod() let's reduce the access mode to the common bits of the old and
829 * the new mode. That way there's no time window where the file exists under the old owner
830 * with more than the old access modes — and not under the new owner with more than the new
831 * access modes either. */
832
833 if (S_ISLNK(st->st_mode))
834 log_debug("Skipping temporary mode fix for symlink %s.", path);
835 else {
836 mode_t m = new_mode & st->st_mode; /* Mask new mode by old mode */
837
838 if (((m ^ st->st_mode) & 07777) == 0)
839 log_debug("\"%s\" matches temporary mode %o already.", path, m);
840 else {
841 log_debug("Temporarily changing \"%s\" to mode %o.", path, m);
842 if (fchmod_opath(fd, m) < 0)
843 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
844 }
845 }
846 }
847
848 if (do_chown) {
849 log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT,
850 path,
851 i->uid_set ? i->uid : UID_INVALID,
852 i->gid_set ? i->gid : GID_INVALID);
853
854 if (fchownat(fd,
855 "",
856 i->uid_set ? i->uid : UID_INVALID,
857 i->gid_set ? i->gid : GID_INVALID,
858 AT_EMPTY_PATH) < 0)
859 return log_error_errno(errno, "fchownat() of %s failed: %m", path);
860 }
861
862 /* Now, apply the final mode. We do this in two cases: when the user set a mode explicitly, or after a
863 * chown(), since chown()'s mangle the access mode in regards to sgid/suid in some conditions. */
864 if (i->mode_set || do_chown) {
865 if (S_ISLNK(st->st_mode))
866 log_debug("Skipping mode fix for symlink %s.", path);
867 else {
868 /* Check if the chmod() is unnecessary. Note that if we did a chown() before we always
869 * chmod() here again, since it might have mangled the bits. */
870 if (!do_chown && ((new_mode ^ st->st_mode) & 07777) == 0)
871 log_debug("\"%s\" matches mode %o already.", path, new_mode);
872 else {
873 log_debug("Changing \"%s\" to mode %o.", path, new_mode);
874 if (fchmod_opath(fd, new_mode) < 0)
875 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
876 }
877 }
878 }
879
880 shortcut:
881 return label_fix(path, 0);
882 }
883
884 static int path_open_parent_safe(const char *path) {
885 _cleanup_free_ char *dn = NULL;
886 int fd;
887
888 if (path_equal(path, "/") || !path_is_normalized(path))
889 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
890 "Failed to open parent of '%s': invalid path.",
891 path);
892
893 dn = dirname_malloc(path);
894 if (!dn)
895 return log_oom();
896
897 fd = chase_symlinks(dn, arg_root, CHASE_OPEN|CHASE_SAFE|CHASE_WARN, NULL);
898 if (fd < 0 && fd != -ENOLINK)
899 return log_error_errno(fd, "Failed to validate path %s: %m", path);
900
901 return fd;
902 }
903
904 static int path_open_safe(const char *path) {
905 int fd;
906
907 /* path_open_safe() returns a file descriptor opened with O_PATH after
908 * verifying that the path doesn't contain unsafe transitions, except
909 * for its final component as the function does not follow symlink. */
910
911 assert(path);
912
913 if (!path_is_normalized(path))
914 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
915 "Failed to open invalid path '%s'.",
916 path);
917
918 fd = chase_symlinks(path, arg_root, CHASE_OPEN|CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL);
919 if (fd < 0 && fd != -ENOLINK)
920 return log_error_errno(fd, "Failed to validate path %s: %m", path);
921
922 return fd;
923 }
924
925 static int path_set_perms(Item *i, const char *path) {
926 _cleanup_close_ int fd = -1;
927
928 assert(i);
929 assert(path);
930
931 fd = path_open_safe(path);
932 if (fd < 0)
933 return fd;
934
935 return fd_set_perms(i, fd, path, NULL);
936 }
937
938 static int parse_xattrs_from_arg(Item *i) {
939 const char *p;
940 int r;
941
942 assert(i);
943 assert(i->argument);
944
945 p = i->argument;
946
947 for (;;) {
948 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
949
950 r = extract_first_word(&p, &xattr, NULL, EXTRACT_QUOTES|EXTRACT_CUNESCAPE);
951 if (r < 0)
952 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
953 if (r <= 0)
954 break;
955
956 r = split_pair(xattr, "=", &name, &value);
957 if (r < 0) {
958 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
959 continue;
960 }
961
962 if (isempty(name) || isempty(value)) {
963 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
964 continue;
965 }
966
967 if (strv_push_pair(&i->xattrs, name, value) < 0)
968 return log_oom();
969
970 name = value = NULL;
971 }
972
973 return 0;
974 }
975
976 static int fd_set_xattrs(Item *i, int fd, const char *path, const struct stat *st) {
977 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
978 char **name, **value;
979
980 assert(i);
981 assert(fd);
982 assert(path);
983
984 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
985
986 STRV_FOREACH_PAIR(name, value, i->xattrs) {
987 log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
988 if (setxattr(procfs_path, *name, *value, strlen(*value), 0) < 0)
989 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
990 *name, *value, path);
991 }
992 return 0;
993 }
994
995 static int path_set_xattrs(Item *i, const char *path) {
996 _cleanup_close_ int fd = -1;
997
998 assert(i);
999 assert(path);
1000
1001 fd = path_open_safe(path);
1002 if (fd < 0)
1003 return fd;
1004
1005 return fd_set_xattrs(i, fd, path, NULL);
1006 }
1007
1008 static int parse_acls_from_arg(Item *item) {
1009 #if HAVE_ACL
1010 int r;
1011
1012 assert(item);
1013
1014 /* If force (= modify) is set, we will not modify the acl
1015 * afterwards, so the mask can be added now if necessary. */
1016
1017 r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->force);
1018 if (r < 0)
1019 log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
1020 #else
1021 log_warning_errno(SYNTHETIC_ERRNO(ENOSYS), "ACLs are not supported. Ignoring");
1022 #endif
1023
1024 return 0;
1025 }
1026
1027 #if HAVE_ACL
1028 static int path_set_acl(const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) {
1029 _cleanup_(acl_free_charpp) char *t = NULL;
1030 _cleanup_(acl_freep) acl_t dup = NULL;
1031 int r;
1032
1033 /* Returns 0 for success, positive error if already warned,
1034 * negative error otherwise. */
1035
1036 if (modify) {
1037 r = acls_for_file(path, type, acl, &dup);
1038 if (r < 0)
1039 return r;
1040
1041 r = calc_acl_mask_if_needed(&dup);
1042 if (r < 0)
1043 return r;
1044 } else {
1045 dup = acl_dup(acl);
1046 if (!dup)
1047 return -errno;
1048
1049 /* the mask was already added earlier if needed */
1050 }
1051
1052 r = add_base_acls_if_needed(&dup, path);
1053 if (r < 0)
1054 return r;
1055
1056 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
1057 log_debug("Setting %s ACL %s on %s.",
1058 type == ACL_TYPE_ACCESS ? "access" : "default",
1059 strna(t), pretty);
1060
1061 r = acl_set_file(path, type, dup);
1062 if (r < 0)
1063 /* Return positive to indicate we already warned */
1064 return -log_error_errno(errno,
1065 "Setting %s ACL \"%s\" on %s failed: %m",
1066 type == ACL_TYPE_ACCESS ? "access" : "default",
1067 strna(t), pretty);
1068
1069 return 0;
1070 }
1071 #endif
1072
1073 static int fd_set_acls(Item *item, int fd, const char *path, const struct stat *st) {
1074 int r = 0;
1075 #if HAVE_ACL
1076 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1077 struct stat stbuf;
1078
1079 assert(item);
1080 assert(fd);
1081 assert(path);
1082
1083 if (!st) {
1084 if (fstat(fd, &stbuf) < 0)
1085 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1086 st = &stbuf;
1087 }
1088
1089 if (hardlink_vulnerable(st))
1090 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
1091 "Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
1092 path);
1093
1094 if (S_ISLNK(st->st_mode)) {
1095 log_debug("Skipping ACL fix for symlink %s.", path);
1096 return 0;
1097 }
1098
1099 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1100
1101 if (item->acl_access)
1102 r = path_set_acl(procfs_path, path, ACL_TYPE_ACCESS, item->acl_access, item->force);
1103
1104 /* set only default acls to folders */
1105 if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
1106 r = path_set_acl(procfs_path, path, ACL_TYPE_DEFAULT, item->acl_default, item->force);
1107
1108 if (r > 0)
1109 return -r; /* already warned */
1110 if (r == -EOPNOTSUPP) {
1111 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1112 return 0;
1113 }
1114 if (r < 0)
1115 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1116 #endif
1117 return r;
1118 }
1119
1120 static int path_set_acls(Item *item, const char *path) {
1121 int r = 0;
1122 #if HAVE_ACL
1123 _cleanup_close_ int fd = -1;
1124
1125 assert(item);
1126 assert(path);
1127
1128 fd = path_open_safe(path);
1129 if (fd < 0)
1130 return fd;
1131
1132 r = fd_set_acls(item, fd, path, NULL);
1133 #endif
1134 return r;
1135 }
1136
1137 static int parse_attribute_from_arg(Item *item) {
1138
1139 static const struct {
1140 char character;
1141 unsigned value;
1142 } attributes[] = {
1143 { 'A', FS_NOATIME_FL }, /* do not update atime */
1144 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1145 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1146 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1147 { 'c', FS_COMPR_FL }, /* Compress file */
1148 { 'd', FS_NODUMP_FL }, /* do not dump file */
1149 { 'e', FS_EXTENT_FL }, /* Extents */
1150 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1151 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1152 { 's', FS_SECRM_FL }, /* Secure deletion */
1153 { 'u', FS_UNRM_FL }, /* Undelete */
1154 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1155 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1156 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1157 { 'P', FS_PROJINHERIT_FL }, /* Inherit the quota project ID */
1158 };
1159
1160 enum {
1161 MODE_ADD,
1162 MODE_DEL,
1163 MODE_SET
1164 } mode = MODE_ADD;
1165
1166 unsigned value = 0, mask = 0;
1167 const char *p;
1168
1169 assert(item);
1170
1171 p = item->argument;
1172 if (p) {
1173 if (*p == '+') {
1174 mode = MODE_ADD;
1175 p++;
1176 } else if (*p == '-') {
1177 mode = MODE_DEL;
1178 p++;
1179 } else if (*p == '=') {
1180 mode = MODE_SET;
1181 p++;
1182 }
1183 }
1184
1185 if (isempty(p) && mode != MODE_SET)
1186 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1187 "Setting file attribute on '%s' needs an attribute specification.",
1188 item->path);
1189
1190 for (; p && *p ; p++) {
1191 unsigned i, v;
1192
1193 for (i = 0; i < ELEMENTSOF(attributes); i++)
1194 if (*p == attributes[i].character)
1195 break;
1196
1197 if (i >= ELEMENTSOF(attributes))
1198 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1199 "Unknown file attribute '%c' on '%s'.",
1200 *p, item->path);
1201
1202 v = attributes[i].value;
1203
1204 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1205
1206 mask |= v;
1207 }
1208
1209 if (mode == MODE_SET)
1210 mask |= CHATTR_ALL_FL;
1211
1212 assert(mask != 0);
1213
1214 item->attribute_mask = mask;
1215 item->attribute_value = value;
1216 item->attribute_set = true;
1217
1218 return 0;
1219 }
1220
1221 static int fd_set_attribute(Item *item, int fd, const char *path, const struct stat *st) {
1222 _cleanup_close_ int procfs_fd = -1;
1223 struct stat stbuf;
1224 unsigned f;
1225 int r;
1226
1227 assert(item);
1228 assert(fd);
1229 assert(path);
1230
1231 if (!item->attribute_set || item->attribute_mask == 0)
1232 return 0;
1233
1234 if (!st) {
1235 if (fstat(fd, &stbuf) < 0)
1236 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1237 st = &stbuf;
1238 }
1239
1240 /* Issuing the file attribute ioctls on device nodes is not
1241 * safe, as that will be delivered to the drivers, not the
1242 * file system containing the device node. */
1243 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
1244 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1245 "Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
1246 path);
1247
1248 f = item->attribute_value & item->attribute_mask;
1249
1250 /* Mask away directory-specific flags */
1251 if (!S_ISDIR(st->st_mode))
1252 f &= ~FS_DIRSYNC_FL;
1253
1254 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1255 if (procfs_fd < 0)
1256 return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
1257
1258 r = chattr_fd(procfs_fd, f, item->attribute_mask, NULL);
1259 if (r < 0)
1260 log_full_errno(IN_SET(r, -ENOTTY, -EOPNOTSUPP) ? LOG_DEBUG : LOG_WARNING,
1261 r,
1262 "Cannot set file attribute for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1263 path, item->attribute_value, item->attribute_mask);
1264
1265 return 0;
1266 }
1267
1268 static int path_set_attribute(Item *item, const char *path) {
1269 _cleanup_close_ int fd = -1;
1270
1271 if (!item->attribute_set || item->attribute_mask == 0)
1272 return 0;
1273
1274 fd = path_open_safe(path);
1275 if (fd < 0)
1276 return fd;
1277
1278 return fd_set_attribute(item, fd, path, NULL);
1279 }
1280
1281 static int write_one_file(Item *i, const char *path) {
1282 _cleanup_close_ int fd = -1, dir_fd = -1;
1283 char *bn;
1284 int r;
1285
1286 assert(i);
1287 assert(path);
1288 assert(i->argument);
1289 assert(i->type == WRITE_FILE);
1290
1291 /* Validate the path and keep the fd on the directory for opening the
1292 * file so we're sure that it can't be changed behind our back. */
1293 dir_fd = path_open_parent_safe(path);
1294 if (dir_fd < 0)
1295 return dir_fd;
1296
1297 bn = basename(path);
1298
1299 /* Follows symlinks */
1300 fd = openat(dir_fd, bn, O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1301 if (fd < 0) {
1302 if (errno == ENOENT) {
1303 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1304 return 0;
1305 }
1306 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1307 }
1308
1309 /* 'w' is allowed to write into any kind of files. */
1310 log_debug("Writing to \"%s\".", path);
1311
1312 r = loop_write(fd, i->argument, strlen(i->argument), false);
1313 if (r < 0)
1314 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1315
1316 return fd_set_perms(i, fd, path, NULL);
1317 }
1318
1319 static int create_file(Item *i, const char *path) {
1320 _cleanup_close_ int fd = -1, dir_fd = -1;
1321 struct stat stbuf, *st = NULL;
1322 int r = 0;
1323 char *bn;
1324
1325 assert(i);
1326 assert(path);
1327 assert(i->type == CREATE_FILE);
1328
1329 /* 'f' operates on regular files exclusively. */
1330
1331 /* Validate the path and keep the fd on the directory for opening the
1332 * file so we're sure that it can't be changed behind our back. */
1333 dir_fd = path_open_parent_safe(path);
1334 if (dir_fd < 0)
1335 return dir_fd;
1336
1337 bn = basename(path);
1338
1339 RUN_WITH_UMASK(0000) {
1340 mac_selinux_create_file_prepare(path, S_IFREG);
1341 fd = openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1342 mac_selinux_create_file_clear();
1343 }
1344
1345 if (fd < 0) {
1346 /* Even on a read-only filesystem, open(2) returns EEXIST if the
1347 * file already exists. It returns EROFS only if it needs to
1348 * create the file. */
1349 if (errno != EEXIST)
1350 return log_error_errno(errno, "Failed to create file %s: %m", path);
1351
1352 /* Re-open the file. At that point it must exist since open(2)
1353 * failed with EEXIST. We still need to check if the perms/mode
1354 * need to be changed. For read-only filesystems, we let
1355 * fd_set_perms() report the error if the perms need to be
1356 * modified. */
1357 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1358 if (fd < 0)
1359 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1360
1361 if (fstat(fd, &stbuf) < 0)
1362 return log_error_errno(errno, "stat(%s) failed: %m", path);
1363
1364 if (!S_ISREG(stbuf.st_mode)) {
1365 log_error("%s exists and is not a regular file.", path);
1366 return -EEXIST;
1367 }
1368
1369 st = &stbuf;
1370 } else {
1371
1372 log_debug("\"%s\" has been created.", path);
1373
1374 if (i->argument) {
1375 log_debug("Writing to \"%s\".", path);
1376
1377 r = loop_write(fd, i->argument, strlen(i->argument), false);
1378 if (r < 0)
1379 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1380 }
1381 }
1382
1383 return fd_set_perms(i, fd, path, st);
1384 }
1385
1386 static int truncate_file(Item *i, const char *path) {
1387 _cleanup_close_ int fd = -1, dir_fd = -1;
1388 struct stat stbuf, *st = NULL;
1389 bool erofs = false;
1390 int r = 0;
1391 char *bn;
1392
1393 assert(i);
1394 assert(path);
1395 assert(i->type == TRUNCATE_FILE);
1396
1397 /* We want to operate on regular file exclusively especially since
1398 * O_TRUNC is unspecified if the file is neither a regular file nor a
1399 * fifo nor a terminal device. Therefore we first open the file and make
1400 * sure it's a regular one before truncating it. */
1401
1402 /* Validate the path and keep the fd on the directory for opening the
1403 * file so we're sure that it can't be changed behind our back. */
1404 dir_fd = path_open_parent_safe(path);
1405 if (dir_fd < 0)
1406 return dir_fd;
1407
1408 bn = basename(path);
1409
1410 RUN_WITH_UMASK(0000) {
1411 mac_selinux_create_file_prepare(path, S_IFREG);
1412 fd = openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1413 mac_selinux_create_file_clear();
1414 }
1415
1416 if (fd < 0) {
1417 if (errno != EROFS)
1418 return log_error_errno(errno, "Failed to open/create file %s: %m", path);
1419
1420 /* On a read-only filesystem, we don't want to fail if the
1421 * target is already empty and the perms are set. So we still
1422 * proceed with the sanity checks and let the remaining
1423 * operations fail with EROFS if they try to modify the target
1424 * file. */
1425
1426 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1427 if (fd < 0) {
1428 if (errno == ENOENT) {
1429 log_error("Cannot create file %s on a read-only file system.", path);
1430 return -EROFS;
1431 }
1432
1433 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1434 }
1435
1436 erofs = true;
1437 }
1438
1439 if (fstat(fd, &stbuf) < 0)
1440 return log_error_errno(errno, "stat(%s) failed: %m", path);
1441
1442 if (!S_ISREG(stbuf.st_mode)) {
1443 log_error("%s exists and is not a regular file.", path);
1444 return -EEXIST;
1445 }
1446
1447 if (stbuf.st_size > 0) {
1448 if (ftruncate(fd, 0) < 0) {
1449 r = erofs ? -EROFS : -errno;
1450 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1451 }
1452 } else
1453 st = &stbuf;
1454
1455 log_debug("\"%s\" has been created.", path);
1456
1457 if (i->argument) {
1458 log_debug("Writing to \"%s\".", path);
1459
1460 r = loop_write(fd, i->argument, strlen(i->argument), false);
1461 if (r < 0) {
1462 r = erofs ? -EROFS : r;
1463 return log_error_errno(r, "Failed to write file %s: %m", path);
1464 }
1465 }
1466
1467 return fd_set_perms(i, fd, path, st);
1468 }
1469
1470 static int copy_files(Item *i) {
1471 _cleanup_close_ int dfd = -1, fd = -1;
1472 char *bn;
1473 int r;
1474
1475 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1476
1477 bn = basename(i->path);
1478
1479 /* Validate the path and use the returned directory fd for copying the
1480 * target so we're sure that the path can't be changed behind our
1481 * back. */
1482 dfd = path_open_parent_safe(i->path);
1483 if (dfd < 0)
1484 return dfd;
1485
1486 r = copy_tree_at(AT_FDCWD, i->argument,
1487 dfd, bn,
1488 i->uid_set ? i->uid : UID_INVALID,
1489 i->gid_set ? i->gid : GID_INVALID,
1490 COPY_REFLINK | COPY_MERGE_EMPTY);
1491 if (r < 0) {
1492 struct stat a, b;
1493
1494 /* If the target already exists on read-only filesystems, trying
1495 * to create the target will not fail with EEXIST but with
1496 * EROFS. */
1497 if (r == -EROFS && faccessat(dfd, bn, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
1498 r = -EEXIST;
1499
1500 if (r != -EEXIST)
1501 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1502
1503 if (stat(i->argument, &a) < 0)
1504 return log_error_errno(errno, "stat(%s) failed: %m", i->argument);
1505
1506 if (fstatat(dfd, bn, &b, AT_SYMLINK_NOFOLLOW) < 0)
1507 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1508
1509 if ((a.st_mode ^ b.st_mode) & S_IFMT) {
1510 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1511 return 0;
1512 }
1513 }
1514
1515 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1516 if (fd < 0)
1517 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1518
1519 return fd_set_perms(i, fd, i->path, NULL);
1520 }
1521
1522 typedef enum {
1523 CREATION_NORMAL,
1524 CREATION_EXISTING,
1525 CREATION_FORCE,
1526 _CREATION_MODE_MAX,
1527 _CREATION_MODE_INVALID = -1
1528 } CreationMode;
1529
1530 static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = {
1531 [CREATION_NORMAL] = "Created",
1532 [CREATION_EXISTING] = "Found existing",
1533 [CREATION_FORCE] = "Created replacement",
1534 };
1535
1536 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
1537
1538 static int create_directory_or_subvolume(const char *path, mode_t mode, bool subvol, CreationMode *creation) {
1539 _cleanup_close_ int pfd = -1;
1540 CreationMode c;
1541 int r;
1542
1543 assert(path);
1544
1545 if (!creation)
1546 creation = &c;
1547
1548 pfd = path_open_parent_safe(path);
1549 if (pfd < 0)
1550 return pfd;
1551
1552 if (subvol) {
1553 if (btrfs_is_subvol(empty_to_root(arg_root)) <= 0)
1554
1555 /* Don't create a subvolume unless the root directory is
1556 * one, too. We do this under the assumption that if the
1557 * root directory is just a plain directory (i.e. very
1558 * light-weight), we shouldn't try to split it up into
1559 * subvolumes (i.e. more heavy-weight). Thus, chroot()
1560 * environments and suchlike will get a full brtfs
1561 * subvolume set up below their tree only if they
1562 * specifically set up a btrfs subvolume for the root
1563 * dir too. */
1564
1565 subvol = false;
1566 else {
1567 RUN_WITH_UMASK((~mode) & 0777)
1568 r = btrfs_subvol_make_fd(pfd, basename(path));
1569 }
1570 } else
1571 r = 0;
1572
1573 if (!subvol || r == -ENOTTY)
1574 RUN_WITH_UMASK(0000)
1575 r = mkdirat_label(pfd, basename(path), mode);
1576
1577 if (r < 0) {
1578 int k;
1579
1580 if (!IN_SET(r, -EEXIST, -EROFS))
1581 return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", path);
1582
1583 k = is_dir_fd(pfd);
1584 if (k == -ENOENT && r == -EROFS)
1585 return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", path);
1586 if (k < 0)
1587 return log_error_errno(k, "Failed to check if %s exists: %m", path);
1588 if (!k) {
1589 log_warning("\"%s\" already exists and is not a directory.", path);
1590 return -EEXIST;
1591 }
1592
1593 *creation = CREATION_EXISTING;
1594 } else
1595 *creation = CREATION_NORMAL;
1596
1597 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(*creation), path);
1598
1599 r = openat(pfd, basename(path), O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
1600 if (r < 0)
1601 return log_error_errno(errno, "Failed to open directory '%s': %m", basename(path));
1602
1603 return r;
1604 }
1605
1606 static int create_directory(Item *i, const char *path) {
1607 _cleanup_close_ int fd = -1;
1608
1609 assert(i);
1610 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
1611
1612 fd = create_directory_or_subvolume(path, i->mode, false, NULL);
1613 if (fd == -EEXIST)
1614 return 0;
1615 if (fd < 0)
1616 return fd;
1617
1618 return fd_set_perms(i, fd, path, NULL);
1619 }
1620
1621 static int create_subvolume(Item *i, const char *path) {
1622 _cleanup_close_ int fd = -1;
1623 CreationMode creation;
1624 int r, q = 0;
1625
1626 assert(i);
1627 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
1628
1629 fd = create_directory_or_subvolume(path, i->mode, true, &creation);
1630 if (fd == -EEXIST)
1631 return 0;
1632 if (fd < 0)
1633 return fd;
1634
1635 if (creation == CREATION_NORMAL &&
1636 IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
1637 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
1638 if (r == -ENOTTY)
1639 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
1640 else if (r == -EROFS)
1641 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
1642 else if (r == -ENOPROTOOPT)
1643 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
1644 else if (r < 0)
1645 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
1646 else if (r > 0)
1647 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
1648 else if (r == 0)
1649 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
1650 }
1651
1652 r = fd_set_perms(i, fd, path, NULL);
1653 if (q < 0) /* prefer the quota change error from above */
1654 return q;
1655
1656 return r;
1657 }
1658
1659 static int empty_directory(Item *i, const char *path) {
1660 int r;
1661
1662 assert(i);
1663 assert(i->type == EMPTY_DIRECTORY);
1664
1665 r = is_dir(path, false);
1666 if (r == -ENOENT) {
1667 /* Option "e" operates only on existing objects. Do not
1668 * print errors about non-existent files or directories */
1669 log_debug("Skipping missing directory: %s", path);
1670 return 0;
1671 }
1672 if (r < 0)
1673 return log_error_errno(r, "is_dir() failed on path %s: %m", path);
1674 if (r == 0)
1675 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1676 "'%s' already exists and is not a directory.",
1677 path);
1678
1679 return path_set_perms(i, path);
1680 }
1681
1682 static int create_device(Item *i, mode_t file_type) {
1683 _cleanup_close_ int dfd = -1, fd = -1;
1684 CreationMode creation;
1685 char *bn;
1686 int r;
1687
1688 assert(i);
1689 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
1690
1691 bn = basename(i->path);
1692
1693 /* Validate the path and use the returned directory fd for copying the
1694 * target so we're sure that the path can't be changed behind our
1695 * back. */
1696 dfd = path_open_parent_safe(i->path);
1697 if (dfd < 0)
1698 return dfd;
1699
1700 RUN_WITH_UMASK(0000) {
1701 mac_selinux_create_file_prepare(i->path, file_type);
1702 r = mknodat(dfd, bn, i->mode | file_type, i->major_minor);
1703 mac_selinux_create_file_clear();
1704 }
1705
1706 if (r < 0) {
1707 struct stat st;
1708
1709 if (errno == EPERM) {
1710 log_debug("We lack permissions, possibly because of cgroup configuration; "
1711 "skipping creation of device node %s.", i->path);
1712 return 0;
1713 }
1714
1715 if (errno != EEXIST)
1716 return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
1717
1718 if (fstatat(dfd, bn, &st, 0) < 0)
1719 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1720
1721 if ((st.st_mode & S_IFMT) != file_type) {
1722
1723 if (i->force) {
1724
1725 RUN_WITH_UMASK(0000) {
1726 mac_selinux_create_file_prepare(i->path, file_type);
1727 /* FIXME: need to introduce mknodat_atomic() */
1728 r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
1729 mac_selinux_create_file_clear();
1730 }
1731
1732 if (r < 0)
1733 return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
1734 creation = CREATION_FORCE;
1735 } else {
1736 log_debug("%s is not a device node.", i->path);
1737 return 0;
1738 }
1739 } else
1740 creation = CREATION_EXISTING;
1741 } else
1742 creation = CREATION_NORMAL;
1743
1744 log_debug("%s %s device node \"%s\" %u:%u.",
1745 creation_mode_verb_to_string(creation),
1746 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
1747 i->path, major(i->mode), minor(i->mode));
1748
1749 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1750 if (fd < 0)
1751 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1752
1753 return fd_set_perms(i, fd, i->path, NULL);
1754 }
1755
1756 static int create_fifo(Item *i, const char *path) {
1757 _cleanup_close_ int pfd = -1, fd = -1;
1758 CreationMode creation;
1759 struct stat st;
1760 char *bn;
1761 int r;
1762
1763 pfd = path_open_parent_safe(path);
1764 if (pfd < 0)
1765 return pfd;
1766
1767 bn = basename(path);
1768
1769 RUN_WITH_UMASK(0000) {
1770 mac_selinux_create_file_prepare(path, S_IFIFO);
1771 r = mkfifoat(pfd, bn, i->mode);
1772 mac_selinux_create_file_clear();
1773 }
1774
1775 if (r < 0) {
1776 if (errno != EEXIST)
1777 return log_error_errno(errno, "Failed to create fifo %s: %m", path);
1778
1779 if (fstatat(pfd, bn, &st, AT_SYMLINK_NOFOLLOW) < 0)
1780 return log_error_errno(errno, "stat(%s) failed: %m", path);
1781
1782 if (!S_ISFIFO(st.st_mode)) {
1783
1784 if (i->force) {
1785 RUN_WITH_UMASK(0000) {
1786 mac_selinux_create_file_prepare(path, S_IFIFO);
1787 r = mkfifoat_atomic(pfd, bn, i->mode);
1788 mac_selinux_create_file_clear();
1789 }
1790
1791 if (r < 0)
1792 return log_error_errno(r, "Failed to create fifo %s: %m", path);
1793 creation = CREATION_FORCE;
1794 } else {
1795 log_warning("\"%s\" already exists and is not a fifo.", path);
1796 return 0;
1797 }
1798 } else
1799 creation = CREATION_EXISTING;
1800 } else
1801 creation = CREATION_NORMAL;
1802
1803 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), path);
1804
1805 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1806 if (fd < 0)
1807 return log_error_errno(errno, "Failed to openat(%s): %m", path);
1808
1809 return fd_set_perms(i, fd, i->path, NULL);
1810 }
1811
1812 typedef int (*action_t)(Item *i, const char *path);
1813 typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st);
1814
1815 static int item_do(Item *i, int fd, const char *path, fdaction_t action) {
1816 struct stat st;
1817 int r = 0, q;
1818
1819 assert(i);
1820 assert(path);
1821 assert(fd >= 0);
1822
1823 if (fstat(fd, &st) < 0) {
1824 r = log_error_errno(errno, "fstat() on file failed: %m");
1825 goto finish;
1826 }
1827
1828 /* This returns the first error we run into, but nevertheless
1829 * tries to go on */
1830 r = action(i, fd, path, &st);
1831
1832 if (S_ISDIR(st.st_mode)) {
1833 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1834 _cleanup_closedir_ DIR *d = NULL;
1835 struct dirent *de;
1836
1837 /* The passed 'fd' was opened with O_PATH. We need to convert
1838 * it into a 'regular' fd before reading the directory content. */
1839 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1840
1841 d = opendir(procfs_path);
1842 if (!d) {
1843 log_error_errno(errno, "Failed to opendir() '%s': %m", procfs_path);
1844 if (r == 0)
1845 r = -errno;
1846 goto finish;
1847 }
1848
1849 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
1850 int de_fd;
1851
1852 if (dot_or_dot_dot(de->d_name))
1853 continue;
1854
1855 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1856 if (de_fd < 0)
1857 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
1858 else {
1859 _cleanup_free_ char *de_path = NULL;
1860
1861 de_path = path_join(path, de->d_name);
1862 if (!de_path)
1863 q = log_oom();
1864 else
1865 /* Pass ownership of dirent fd over */
1866 q = item_do(i, de_fd, de_path, action);
1867 }
1868
1869 if (q < 0 && r == 0)
1870 r = q;
1871 }
1872 }
1873 finish:
1874 safe_close(fd);
1875 return r;
1876 }
1877
1878 static int glob_item(Item *i, action_t action) {
1879 _cleanup_globfree_ glob_t g = {
1880 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1881 };
1882 int r = 0, k;
1883 char **fn;
1884
1885 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1886 if (k < 0 && k != -ENOENT)
1887 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1888
1889 STRV_FOREACH(fn, g.gl_pathv) {
1890 k = action(i, *fn);
1891 if (k < 0 && r == 0)
1892 r = k;
1893 }
1894
1895 return r;
1896 }
1897
1898 static int glob_item_recursively(Item *i, fdaction_t action) {
1899 _cleanup_globfree_ glob_t g = {
1900 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1901 };
1902 int r = 0, k;
1903 char **fn;
1904
1905 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1906 if (k < 0 && k != -ENOENT)
1907 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1908
1909 STRV_FOREACH(fn, g.gl_pathv) {
1910 _cleanup_close_ int fd = -1;
1911
1912 /* Make sure we won't trigger/follow file object (such as
1913 * device nodes, automounts, ...) pointed out by 'fn' with
1914 * O_PATH. Note, when O_PATH is used, flags other than
1915 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
1916
1917 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
1918 if (fd < 0) {
1919 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
1920 if (r == 0)
1921 r = -errno;
1922 continue;
1923 }
1924
1925 k = item_do(i, fd, *fn, action);
1926 if (k < 0 && r == 0)
1927 r = k;
1928
1929 /* we passed fd ownership to the previous call */
1930 fd = -1;
1931 }
1932
1933 return r;
1934 }
1935
1936 static int create_item(Item *i) {
1937 CreationMode creation;
1938 int r = 0;
1939
1940 assert(i);
1941
1942 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
1943
1944 switch (i->type) {
1945
1946 case IGNORE_PATH:
1947 case IGNORE_DIRECTORY_PATH:
1948 case REMOVE_PATH:
1949 case RECURSIVE_REMOVE_PATH:
1950 return 0;
1951
1952 case CREATE_FILE:
1953 RUN_WITH_UMASK(0000)
1954 (void) mkdir_parents_label(i->path, 0755);
1955
1956 r = create_file(i, i->path);
1957 if (r < 0)
1958 return r;
1959 break;
1960
1961 case TRUNCATE_FILE:
1962 RUN_WITH_UMASK(0000)
1963 (void) mkdir_parents_label(i->path, 0755);
1964
1965 r = truncate_file(i, i->path);
1966 if (r < 0)
1967 return r;
1968 break;
1969
1970 case COPY_FILES:
1971 RUN_WITH_UMASK(0000)
1972 (void) mkdir_parents_label(i->path, 0755);
1973
1974 r = copy_files(i);
1975 if (r < 0)
1976 return r;
1977 break;
1978
1979 case WRITE_FILE:
1980 r = glob_item(i, write_one_file);
1981 if (r < 0)
1982 return r;
1983
1984 break;
1985
1986 case CREATE_DIRECTORY:
1987 case TRUNCATE_DIRECTORY:
1988 RUN_WITH_UMASK(0000)
1989 (void) mkdir_parents_label(i->path, 0755);
1990
1991 r = create_directory(i, i->path);
1992 if (r < 0)
1993 return r;
1994 break;
1995
1996 case CREATE_SUBVOLUME:
1997 case CREATE_SUBVOLUME_INHERIT_QUOTA:
1998 case CREATE_SUBVOLUME_NEW_QUOTA:
1999 RUN_WITH_UMASK(0000)
2000 (void) mkdir_parents_label(i->path, 0755);
2001
2002 r = create_subvolume(i, i->path);
2003 if (r < 0)
2004 return r;
2005 break;
2006
2007 case EMPTY_DIRECTORY:
2008 r = glob_item(i, empty_directory);
2009 if (r < 0)
2010 return r;
2011 break;
2012
2013 case CREATE_FIFO:
2014 RUN_WITH_UMASK(0000)
2015 (void) mkdir_parents_label(i->path, 0755);
2016
2017 r = create_fifo(i, i->path);
2018 if (r < 0)
2019 return r;
2020 break;
2021
2022 case CREATE_SYMLINK: {
2023 RUN_WITH_UMASK(0000)
2024 (void) mkdir_parents_label(i->path, 0755);
2025
2026 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2027 r = symlink(i->argument, i->path);
2028 mac_selinux_create_file_clear();
2029
2030 if (r < 0) {
2031 _cleanup_free_ char *x = NULL;
2032
2033 if (errno != EEXIST)
2034 return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);
2035
2036 r = readlink_malloc(i->path, &x);
2037 if (r < 0 || !streq(i->argument, x)) {
2038
2039 if (i->force) {
2040 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2041 r = symlink_atomic(i->argument, i->path);
2042 mac_selinux_create_file_clear();
2043
2044 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2045 r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL);
2046 if (r < 0)
2047 return log_error_errno(r, "rm -fr %s failed: %m", i->path);
2048
2049 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2050 r = symlink(i->argument, i->path) < 0 ? -errno : 0;
2051 mac_selinux_create_file_clear();
2052 }
2053 if (r < 0)
2054 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2055
2056 creation = CREATION_FORCE;
2057 } else {
2058 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2059 return 0;
2060 }
2061 } else
2062 creation = CREATION_EXISTING;
2063 } else
2064
2065 creation = CREATION_NORMAL;
2066 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2067 break;
2068 }
2069
2070 case CREATE_BLOCK_DEVICE:
2071 case CREATE_CHAR_DEVICE:
2072 if (have_effective_cap(CAP_MKNOD) == 0) {
2073 /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
2074 * case to avoid noise, and we don't support virtualized devices in containers anyway. */
2075
2076 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2077 return 0;
2078 }
2079
2080 RUN_WITH_UMASK(0000)
2081 (void) mkdir_parents_label(i->path, 0755);
2082
2083 r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2084 if (r < 0)
2085 return r;
2086
2087 break;
2088
2089 case ADJUST_MODE:
2090 case RELABEL_PATH:
2091 r = glob_item(i, path_set_perms);
2092 if (r < 0)
2093 return r;
2094 break;
2095
2096 case RECURSIVE_RELABEL_PATH:
2097 r = glob_item_recursively(i, fd_set_perms);
2098 if (r < 0)
2099 return r;
2100 break;
2101
2102 case SET_XATTR:
2103 r = glob_item(i, path_set_xattrs);
2104 if (r < 0)
2105 return r;
2106 break;
2107
2108 case RECURSIVE_SET_XATTR:
2109 r = glob_item_recursively(i, fd_set_xattrs);
2110 if (r < 0)
2111 return r;
2112 break;
2113
2114 case SET_ACL:
2115 r = glob_item(i, path_set_acls);
2116 if (r < 0)
2117 return r;
2118 break;
2119
2120 case RECURSIVE_SET_ACL:
2121 r = glob_item_recursively(i, fd_set_acls);
2122 if (r < 0)
2123 return r;
2124 break;
2125
2126 case SET_ATTRIBUTE:
2127 r = glob_item(i, path_set_attribute);
2128 if (r < 0)
2129 return r;
2130 break;
2131
2132 case RECURSIVE_SET_ATTRIBUTE:
2133 r = glob_item_recursively(i, fd_set_attribute);
2134 if (r < 0)
2135 return r;
2136 break;
2137 }
2138
2139 return 0;
2140 }
2141
2142 static int remove_item_instance(Item *i, const char *instance) {
2143 int r;
2144
2145 assert(i);
2146
2147 switch (i->type) {
2148
2149 case REMOVE_PATH:
2150 if (remove(instance) < 0 && errno != ENOENT)
2151 return log_error_errno(errno, "rm(%s): %m", instance);
2152
2153 break;
2154
2155 case RECURSIVE_REMOVE_PATH:
2156 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2157 log_debug("rm -rf \"%s\"", instance);
2158 r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL);
2159 if (r < 0 && r != -ENOENT)
2160 return log_error_errno(r, "rm_rf(%s): %m", instance);
2161
2162 break;
2163
2164 default:
2165 assert_not_reached("wut?");
2166 }
2167
2168 return 0;
2169 }
2170
2171 static int remove_item(Item *i) {
2172 int r;
2173
2174 assert(i);
2175
2176 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
2177
2178 switch (i->type) {
2179
2180 case TRUNCATE_DIRECTORY:
2181 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2182 log_debug("rm -rf \"%s\"", i->path);
2183 r = rm_rf(i->path, REMOVE_PHYSICAL);
2184 if (r < 0 && r != -ENOENT)
2185 return log_error_errno(r, "rm_rf(%s): %m", i->path);
2186
2187 return 0;
2188
2189 case REMOVE_PATH:
2190 case RECURSIVE_REMOVE_PATH:
2191 return glob_item(i, remove_item_instance);
2192
2193 default:
2194 return 0;
2195 }
2196 }
2197
2198 static int clean_item_instance(Item *i, const char* instance) {
2199 _cleanup_closedir_ DIR *d = NULL;
2200 struct stat s, ps;
2201 bool mountpoint;
2202 usec_t cutoff, n;
2203 char timestamp[FORMAT_TIMESTAMP_MAX];
2204
2205 assert(i);
2206
2207 if (!i->age_set)
2208 return 0;
2209
2210 n = now(CLOCK_REALTIME);
2211 if (n < i->age)
2212 return 0;
2213
2214 cutoff = n - i->age;
2215
2216 d = opendir_nomod(instance);
2217 if (!d) {
2218 if (IN_SET(errno, ENOENT, ENOTDIR)) {
2219 log_debug_errno(errno, "Directory \"%s\": %m", instance);
2220 return 0;
2221 }
2222
2223 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
2224 }
2225
2226 if (fstat(dirfd(d), &s) < 0)
2227 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
2228
2229 if (!S_ISDIR(s.st_mode))
2230 return log_error_errno(SYNTHETIC_ERRNO(ENOTDIR),
2231 "%s is not a directory.", i->path);
2232
2233 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
2234 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
2235
2236 mountpoint = s.st_dev != ps.st_dev || s.st_ino == ps.st_ino;
2237
2238 log_debug("Cleanup threshold for %s \"%s\" is %s",
2239 mountpoint ? "mount point" : "directory",
2240 instance,
2241 format_timestamp_us(timestamp, sizeof(timestamp), cutoff));
2242
2243 return dir_cleanup(i, instance, d, &s, cutoff, s.st_dev, mountpoint,
2244 MAX_DEPTH, i->keep_first_level);
2245 }
2246
2247 static int clean_item(Item *i) {
2248 assert(i);
2249
2250 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
2251
2252 switch (i->type) {
2253 case CREATE_DIRECTORY:
2254 case CREATE_SUBVOLUME:
2255 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2256 case CREATE_SUBVOLUME_NEW_QUOTA:
2257 case TRUNCATE_DIRECTORY:
2258 case IGNORE_PATH:
2259 case COPY_FILES:
2260 clean_item_instance(i, i->path);
2261 return 0;
2262 case EMPTY_DIRECTORY:
2263 case IGNORE_DIRECTORY_PATH:
2264 return glob_item(i, clean_item_instance);
2265 default:
2266 return 0;
2267 }
2268 }
2269
2270 static int process_item(Item *i, OperationMask operation) {
2271 OperationMask todo;
2272 int r, q, p;
2273
2274 assert(i);
2275
2276 todo = operation & ~i->done;
2277 if (todo == 0) /* Everything already done? */
2278 return 0;
2279
2280 i->done |= operation;
2281
2282 r = chase_symlinks(i->path, arg_root, CHASE_NO_AUTOFS|CHASE_WARN, NULL);
2283 if (r == -EREMOTE) {
2284 log_notice_errno(r, "Skipping %s", i->path);
2285 return 0;
2286 }
2287 if (r < 0)
2288 log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
2289
2290 r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(i) : 0;
2291 /* Failure can only be tolerated for create */
2292 if (i->allow_failure)
2293 r = 0;
2294
2295 q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(i) : 0;
2296 p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(i) : 0;
2297
2298 return r < 0 ? r :
2299 q < 0 ? q :
2300 p;
2301 }
2302
2303 static int process_item_array(ItemArray *array, OperationMask operation) {
2304 int r = 0;
2305 size_t n;
2306
2307 assert(array);
2308
2309 /* Create any parent first. */
2310 if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
2311 r = process_item_array(array->parent, operation & OPERATION_CREATE);
2312
2313 /* Clean up all children first */
2314 if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) {
2315 Iterator i;
2316 ItemArray *c;
2317
2318 SET_FOREACH(c, array->children, i) {
2319 int k;
2320
2321 k = process_item_array(c, operation & (OPERATION_REMOVE|OPERATION_CLEAN));
2322 if (k < 0 && r == 0)
2323 r = k;
2324 }
2325 }
2326
2327 for (n = 0; n < array->n_items; n++) {
2328 int k;
2329
2330 k = process_item(array->items + n, operation);
2331 if (k < 0 && r == 0)
2332 r = k;
2333 }
2334
2335 return r;
2336 }
2337
2338 static void item_free_contents(Item *i) {
2339 assert(i);
2340 free(i->path);
2341 free(i->argument);
2342 strv_free(i->xattrs);
2343
2344 #if HAVE_ACL
2345 acl_free(i->acl_access);
2346 acl_free(i->acl_default);
2347 #endif
2348 }
2349
2350 static ItemArray* item_array_free(ItemArray *a) {
2351 size_t n;
2352
2353 if (!a)
2354 return NULL;
2355
2356 for (n = 0; n < a->n_items; n++)
2357 item_free_contents(a->items + n);
2358
2359 set_free(a->children);
2360 free(a->items);
2361 return mfree(a);
2362 }
2363
2364 static int item_compare(const Item *a, const Item *b) {
2365 /* Make sure that the ownership taking item is put first, so
2366 * that we first create the node, and then can adjust it */
2367
2368 if (takes_ownership(a->type) && !takes_ownership(b->type))
2369 return -1;
2370 if (!takes_ownership(a->type) && takes_ownership(b->type))
2371 return 1;
2372
2373 return CMP(a->type, b->type);
2374 }
2375
2376 static bool item_compatible(Item *a, Item *b) {
2377 assert(a);
2378 assert(b);
2379 assert(streq(a->path, b->path));
2380
2381 if (takes_ownership(a->type) && takes_ownership(b->type))
2382 /* check if the items are the same */
2383 return streq_ptr(a->argument, b->argument) &&
2384
2385 a->uid_set == b->uid_set &&
2386 a->uid == b->uid &&
2387
2388 a->gid_set == b->gid_set &&
2389 a->gid == b->gid &&
2390
2391 a->mode_set == b->mode_set &&
2392 a->mode == b->mode &&
2393
2394 a->age_set == b->age_set &&
2395 a->age == b->age &&
2396
2397 a->mask_perms == b->mask_perms &&
2398
2399 a->keep_first_level == b->keep_first_level &&
2400
2401 a->major_minor == b->major_minor;
2402
2403 return true;
2404 }
2405
2406 static bool should_include_path(const char *path) {
2407 char **prefix;
2408
2409 STRV_FOREACH(prefix, arg_exclude_prefixes)
2410 if (path_startswith(path, *prefix)) {
2411 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
2412 path, *prefix);
2413 return false;
2414 }
2415
2416 STRV_FOREACH(prefix, arg_include_prefixes)
2417 if (path_startswith(path, *prefix)) {
2418 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
2419 return true;
2420 }
2421
2422 /* no matches, so we should include this path only if we
2423 * have no whitelist at all */
2424 if (strv_isempty(arg_include_prefixes))
2425 return true;
2426
2427 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
2428 return false;
2429 }
2430
2431 static int specifier_expansion_from_arg(Item *i) {
2432 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
2433 char **xattr;
2434 int r;
2435
2436 assert(i);
2437
2438 if (!i->argument)
2439 return 0;
2440
2441 switch (i->type) {
2442 case COPY_FILES:
2443 case CREATE_SYMLINK:
2444 case CREATE_FILE:
2445 case TRUNCATE_FILE:
2446 case WRITE_FILE:
2447 r = cunescape(i->argument, 0, &unescaped);
2448 if (r < 0)
2449 return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument);
2450
2451 r = specifier_printf(unescaped, specifier_table, NULL, &resolved);
2452 if (r < 0)
2453 return r;
2454
2455 free_and_replace(i->argument, resolved);
2456 break;
2457
2458 case SET_XATTR:
2459 case RECURSIVE_SET_XATTR:
2460 assert(i->xattrs);
2461
2462 STRV_FOREACH (xattr, i->xattrs) {
2463 r = specifier_printf(*xattr, specifier_table, NULL, &resolved);
2464 if (r < 0)
2465 return r;
2466
2467 free_and_replace(*xattr, resolved);
2468 }
2469 break;
2470
2471 default:
2472 break;
2473 }
2474 return 0;
2475 }
2476
2477 static int patch_var_run(const char *fname, unsigned line, char **path) {
2478 const char *k;
2479 char *n;
2480
2481 assert(path);
2482 assert(*path);
2483
2484 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
2485 * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
2486 * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
2487 * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
2488 * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
2489 * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
2490 * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
2491 * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
2492 * the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
2493
2494 k = path_startswith(*path, "/var/run/");
2495 if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
2496 return 0;
2497
2498 n = strjoin("/run/", k);
2499 if (!n)
2500 return log_oom();
2501
2502 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
2503 * there's no immediate need for action by the user. However, in the interest of making things less confusing
2504 * to the user, let's still inform the user that these snippets should really be updated. */
2505
2506 log_notice("[%s:%u] Line references path below legacy directory /var/run/, updating %s → %s; please update the tmpfiles.d/ drop-in file accordingly.", fname, line, *path, n);
2507
2508 free_and_replace(*path, n);
2509
2510 return 0;
2511 }
2512
2513 static int parse_line(const char *fname, unsigned line, const char *buffer, bool *invalid_config) {
2514
2515 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
2516 _cleanup_(item_free_contents) Item i = {};
2517 ItemArray *existing;
2518 OrderedHashmap *h;
2519 int r, pos;
2520 bool force = false, boot = false, allow_failure = false;
2521
2522 assert(fname);
2523 assert(line >= 1);
2524 assert(buffer);
2525
2526 r = extract_many_words(
2527 &buffer,
2528 NULL,
2529 EXTRACT_QUOTES,
2530 &action,
2531 &path,
2532 &mode,
2533 &user,
2534 &group,
2535 &age,
2536 NULL);
2537 if (r < 0) {
2538 if (IN_SET(r, -EINVAL, -EBADSLT))
2539 /* invalid quoting and such or an unknown specifier */
2540 *invalid_config = true;
2541 return log_error_errno(r, "[%s:%u] Failed to parse line: %m", fname, line);
2542 } else if (r < 2) {
2543 *invalid_config = true;
2544 log_error("[%s:%u] Syntax error.", fname, line);
2545 return -EIO;
2546 }
2547
2548 if (!empty_or_dash(buffer)) {
2549 i.argument = strdup(buffer);
2550 if (!i.argument)
2551 return log_oom();
2552 }
2553
2554 if (isempty(action)) {
2555 *invalid_config = true;
2556 log_error("[%s:%u] Command too short '%s'.", fname, line, action);
2557 return -EINVAL;
2558 }
2559
2560 for (pos = 1; action[pos]; pos++) {
2561 if (action[pos] == '!' && !boot)
2562 boot = true;
2563 else if (action[pos] == '+' && !force)
2564 force = true;
2565 else if (action[pos] == '-' && !allow_failure)
2566 allow_failure = true;
2567 else {
2568 *invalid_config = true;
2569 log_error("[%s:%u] Unknown modifiers in command '%s'",
2570 fname, line, action);
2571 return -EINVAL;
2572 }
2573 }
2574
2575 if (boot && !arg_boot) {
2576 log_debug("Ignoring entry %s \"%s\" because --boot is not specified.",
2577 action, path);
2578 return 0;
2579 }
2580
2581 i.type = action[0];
2582 i.force = force;
2583 i.allow_failure = allow_failure;
2584
2585 r = specifier_printf(path, specifier_table, NULL, &i.path);
2586 if (r == -ENXIO)
2587 return log_unresolvable_specifier(fname, line);
2588 if (r < 0) {
2589 if (IN_SET(r, -EINVAL, -EBADSLT))
2590 *invalid_config = true;
2591 return log_error_errno(r, "[%s:%u] Failed to replace specifiers: %s", fname, line, path);
2592 }
2593
2594 r = patch_var_run(fname, line, &i.path);
2595 if (r < 0)
2596 return r;
2597
2598 switch (i.type) {
2599
2600 case CREATE_DIRECTORY:
2601 case CREATE_SUBVOLUME:
2602 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2603 case CREATE_SUBVOLUME_NEW_QUOTA:
2604 case EMPTY_DIRECTORY:
2605 case TRUNCATE_DIRECTORY:
2606 case CREATE_FIFO:
2607 case IGNORE_PATH:
2608 case IGNORE_DIRECTORY_PATH:
2609 case REMOVE_PATH:
2610 case RECURSIVE_REMOVE_PATH:
2611 case ADJUST_MODE:
2612 case RELABEL_PATH:
2613 case RECURSIVE_RELABEL_PATH:
2614 if (i.argument)
2615 log_warning("[%s:%u] %c lines don't take argument fields, ignoring.", fname, line, i.type);
2616
2617 break;
2618
2619 case CREATE_FILE:
2620 case TRUNCATE_FILE:
2621 break;
2622
2623 case CREATE_SYMLINK:
2624 if (!i.argument) {
2625 i.argument = strappend("/usr/share/factory/", i.path);
2626 if (!i.argument)
2627 return log_oom();
2628 }
2629 break;
2630
2631 case WRITE_FILE:
2632 if (!i.argument) {
2633 *invalid_config = true;
2634 log_error("[%s:%u] Write file requires argument.", fname, line);
2635 return -EBADMSG;
2636 }
2637 break;
2638
2639 case COPY_FILES:
2640 if (!i.argument) {
2641 i.argument = strappend("/usr/share/factory/", i.path);
2642 if (!i.argument)
2643 return log_oom();
2644 } else if (!path_is_absolute(i.argument)) {
2645 *invalid_config = true;
2646 log_error("[%s:%u] Source path is not absolute.", fname, line);
2647 return -EBADMSG;
2648 }
2649
2650 path_simplify(i.argument, false);
2651 break;
2652
2653 case CREATE_CHAR_DEVICE:
2654 case CREATE_BLOCK_DEVICE:
2655 if (!i.argument) {
2656 *invalid_config = true;
2657 log_error("[%s:%u] Device file requires argument.", fname, line);
2658 return -EBADMSG;
2659 }
2660
2661 r = parse_dev(i.argument, &i.major_minor);
2662 if (r < 0) {
2663 *invalid_config = true;
2664 log_error_errno(r, "[%s:%u] Can't parse device file major/minor '%s'.", fname, line, i.argument);
2665 return -EBADMSG;
2666 }
2667
2668 break;
2669
2670 case SET_XATTR:
2671 case RECURSIVE_SET_XATTR:
2672 if (!i.argument) {
2673 *invalid_config = true;
2674 log_error("[%s:%u] Set extended attribute requires argument.", fname, line);
2675 return -EBADMSG;
2676 }
2677 r = parse_xattrs_from_arg(&i);
2678 if (r < 0)
2679 return r;
2680 break;
2681
2682 case SET_ACL:
2683 case RECURSIVE_SET_ACL:
2684 if (!i.argument) {
2685 *invalid_config = true;
2686 log_error("[%s:%u] Set ACLs requires argument.", fname, line);
2687 return -EBADMSG;
2688 }
2689 r = parse_acls_from_arg(&i);
2690 if (r < 0)
2691 return r;
2692 break;
2693
2694 case SET_ATTRIBUTE:
2695 case RECURSIVE_SET_ATTRIBUTE:
2696 if (!i.argument) {
2697 *invalid_config = true;
2698 log_error("[%s:%u] Set file attribute requires argument.", fname, line);
2699 return -EBADMSG;
2700 }
2701 r = parse_attribute_from_arg(&i);
2702 if (IN_SET(r, -EINVAL, -EBADSLT))
2703 *invalid_config = true;
2704 if (r < 0)
2705 return r;
2706 break;
2707
2708 default:
2709 log_error("[%s:%u] Unknown command type '%c'.", fname, line, (char) i.type);
2710 *invalid_config = true;
2711 return -EBADMSG;
2712 }
2713
2714 if (!path_is_absolute(i.path)) {
2715 log_error("[%s:%u] Path '%s' not absolute.", fname, line, i.path);
2716 *invalid_config = true;
2717 return -EBADMSG;
2718 }
2719
2720 path_simplify(i.path, false);
2721
2722 if (!should_include_path(i.path))
2723 return 0;
2724
2725 r = specifier_expansion_from_arg(&i);
2726 if (r == -ENXIO)
2727 return log_unresolvable_specifier(fname, line);
2728 if (r < 0) {
2729 if (IN_SET(r, -EINVAL, -EBADSLT))
2730 *invalid_config = true;
2731 return log_error_errno(r, "[%s:%u] Failed to substitute specifiers in argument: %m",
2732 fname, line);
2733 }
2734
2735 if (arg_root) {
2736 char *p;
2737
2738 p = prefix_root(arg_root, i.path);
2739 if (!p)
2740 return log_oom();
2741
2742 free_and_replace(i.path, p);
2743 }
2744
2745 if (!empty_or_dash(user)) {
2746 const char *u = user;
2747
2748 r = get_user_creds(&u, &i.uid, NULL, NULL, NULL, USER_CREDS_ALLOW_MISSING);
2749 if (r < 0) {
2750 *invalid_config = true;
2751 return log_error_errno(r, "[%s:%u] Unknown user '%s'.", fname, line, user);
2752 }
2753
2754 i.uid_set = true;
2755 }
2756
2757 if (!empty_or_dash(group)) {
2758 const char *g = group;
2759
2760 r = get_group_creds(&g, &i.gid, USER_CREDS_ALLOW_MISSING);
2761 if (r < 0) {
2762 *invalid_config = true;
2763 log_error("[%s:%u] Unknown group '%s'.", fname, line, group);
2764 return r;
2765 }
2766
2767 i.gid_set = true;
2768 }
2769
2770 if (!empty_or_dash(mode)) {
2771 const char *mm = mode;
2772 unsigned m;
2773
2774 if (*mm == '~') {
2775 i.mask_perms = true;
2776 mm++;
2777 }
2778
2779 if (parse_mode(mm, &m) < 0) {
2780 *invalid_config = true;
2781 log_error("[%s:%u] Invalid mode '%s'.", fname, line, mode);
2782 return -EBADMSG;
2783 }
2784
2785 i.mode = m;
2786 i.mode_set = true;
2787 } else
2788 i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
2789
2790 if (!empty_or_dash(age)) {
2791 const char *a = age;
2792
2793 if (*a == '~') {
2794 i.keep_first_level = true;
2795 a++;
2796 }
2797
2798 if (parse_sec(a, &i.age) < 0) {
2799 *invalid_config = true;
2800 log_error("[%s:%u] Invalid age '%s'.", fname, line, age);
2801 return -EBADMSG;
2802 }
2803
2804 i.age_set = true;
2805 }
2806
2807 h = needs_glob(i.type) ? globs : items;
2808
2809 existing = ordered_hashmap_get(h, i.path);
2810 if (existing) {
2811 size_t n;
2812
2813 for (n = 0; n < existing->n_items; n++) {
2814 if (!item_compatible(existing->items + n, &i)) {
2815 log_notice("[%s:%u] Duplicate line for path \"%s\", ignoring.",
2816 fname, line, i.path);
2817 return 0;
2818 }
2819 }
2820 } else {
2821 existing = new0(ItemArray, 1);
2822 if (!existing)
2823 return log_oom();
2824
2825 r = ordered_hashmap_put(h, i.path, existing);
2826 if (r < 0) {
2827 free(existing);
2828 return log_oom();
2829 }
2830 }
2831
2832 if (!GREEDY_REALLOC(existing->items, existing->allocated, existing->n_items + 1))
2833 return log_oom();
2834
2835 existing->items[existing->n_items++] = i;
2836 i = (struct Item) {};
2837
2838 /* Sort item array, to enforce stable ordering of application */
2839 typesafe_qsort(existing->items, existing->n_items, item_compare);
2840
2841 return 0;
2842 }
2843
2844 static int cat_config(char **config_dirs, char **args) {
2845 _cleanup_strv_free_ char **files = NULL;
2846 int r;
2847
2848 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
2849 if (r < 0)
2850 return r;
2851
2852 return cat_files(NULL, files, 0);
2853 }
2854
2855 static int help(void) {
2856 _cleanup_free_ char *link = NULL;
2857 int r;
2858
2859 r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
2860 if (r < 0)
2861 return log_oom();
2862
2863 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
2864 "Creates, deletes and cleans up volatile and temporary files and directories.\n\n"
2865 " -h --help Show this help\n"
2866 " --user Execute user configuration\n"
2867 " --version Show package version\n"
2868 " --cat-config Show configuration files\n"
2869 " --create Create marked files/directories\n"
2870 " --clean Clean up marked directories\n"
2871 " --remove Remove marked files/directories\n"
2872 " --boot Execute actions only safe at boot\n"
2873 " --prefix=PATH Only apply rules with the specified prefix\n"
2874 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
2875 " --root=PATH Operate on an alternate filesystem root\n"
2876 " --replace=PATH Treat arguments as replacement for PATH\n"
2877 " --no-pager Do not pipe output into a pager\n"
2878 "\nSee the %s for details.\n"
2879 , program_invocation_short_name
2880 , link
2881 );
2882
2883 return 0;
2884 }
2885
2886 static int parse_argv(int argc, char *argv[]) {
2887
2888 enum {
2889 ARG_VERSION = 0x100,
2890 ARG_CAT_CONFIG,
2891 ARG_USER,
2892 ARG_CREATE,
2893 ARG_CLEAN,
2894 ARG_REMOVE,
2895 ARG_BOOT,
2896 ARG_PREFIX,
2897 ARG_EXCLUDE_PREFIX,
2898 ARG_ROOT,
2899 ARG_REPLACE,
2900 ARG_NO_PAGER,
2901 };
2902
2903 static const struct option options[] = {
2904 { "help", no_argument, NULL, 'h' },
2905 { "user", no_argument, NULL, ARG_USER },
2906 { "version", no_argument, NULL, ARG_VERSION },
2907 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
2908 { "create", no_argument, NULL, ARG_CREATE },
2909 { "clean", no_argument, NULL, ARG_CLEAN },
2910 { "remove", no_argument, NULL, ARG_REMOVE },
2911 { "boot", no_argument, NULL, ARG_BOOT },
2912 { "prefix", required_argument, NULL, ARG_PREFIX },
2913 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
2914 { "root", required_argument, NULL, ARG_ROOT },
2915 { "replace", required_argument, NULL, ARG_REPLACE },
2916 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
2917 {}
2918 };
2919
2920 int c, r;
2921
2922 assert(argc >= 0);
2923 assert(argv);
2924
2925 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
2926
2927 switch (c) {
2928
2929 case 'h':
2930 return help();
2931
2932 case ARG_VERSION:
2933 return version();
2934
2935 case ARG_CAT_CONFIG:
2936 arg_cat_config = true;
2937 break;
2938
2939 case ARG_USER:
2940 arg_user = true;
2941 break;
2942
2943 case ARG_CREATE:
2944 arg_operation |= OPERATION_CREATE;
2945 break;
2946
2947 case ARG_CLEAN:
2948 arg_operation |= OPERATION_CLEAN;
2949 break;
2950
2951 case ARG_REMOVE:
2952 arg_operation |= OPERATION_REMOVE;
2953 break;
2954
2955 case ARG_BOOT:
2956 arg_boot = true;
2957 break;
2958
2959 case ARG_PREFIX:
2960 if (strv_push(&arg_include_prefixes, optarg) < 0)
2961 return log_oom();
2962 break;
2963
2964 case ARG_EXCLUDE_PREFIX:
2965 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
2966 return log_oom();
2967 break;
2968
2969 case ARG_ROOT:
2970 r = parse_path_argument_and_warn(optarg, true, &arg_root);
2971 if (r < 0)
2972 return r;
2973 break;
2974
2975 case ARG_REPLACE:
2976 if (!path_is_absolute(optarg) ||
2977 !endswith(optarg, ".conf"))
2978 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2979 "The argument to --replace= must an absolute path to a config file");
2980
2981 arg_replace = optarg;
2982 break;
2983
2984 case ARG_NO_PAGER:
2985 arg_pager_flags |= PAGER_DISABLE;
2986 break;
2987
2988 case '?':
2989 return -EINVAL;
2990
2991 default:
2992 assert_not_reached("Unhandled option");
2993 }
2994
2995 if (arg_operation == 0 && !arg_cat_config)
2996 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2997 "You need to specify at least one of --clean, --create or --remove.");
2998
2999 if (arg_replace && arg_cat_config)
3000 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3001 "Option --replace= is not supported with --cat-config");
3002
3003 if (arg_replace && optind >= argc)
3004 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3005 "When --replace= is given, some configuration items must be specified");
3006
3007 return 1;
3008 }
3009
3010 static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) {
3011 _cleanup_fclose_ FILE *_f = NULL;
3012 Iterator iterator;
3013 unsigned v = 0;
3014 FILE *f;
3015 Item *i;
3016 int r = 0;
3017
3018 assert(fn);
3019
3020 if (streq(fn, "-")) {
3021 log_debug("Reading config from stdin…");
3022 fn = "<stdin>";
3023 f = stdin;
3024 } else {
3025 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f);
3026 if (r < 0) {
3027 if (ignore_enoent && r == -ENOENT) {
3028 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
3029 return 0;
3030 }
3031
3032 return log_error_errno(r, "Failed to open '%s': %m", fn);
3033 }
3034 log_debug("Reading config file \"%s\"…", fn);
3035 f = _f;
3036 }
3037
3038 for (;;) {
3039 _cleanup_free_ char *line = NULL;
3040 bool invalid_line = false;
3041 char *l;
3042 int k;
3043
3044 k = read_line(f, LONG_LINE_MAX, &line);
3045 if (k < 0)
3046 return log_error_errno(k, "Failed to read '%s': %m", fn);
3047 if (k == 0)
3048 break;
3049
3050 v++;
3051
3052 l = strstrip(line);
3053 if (IN_SET(*l, 0, '#'))
3054 continue;
3055
3056 k = parse_line(fn, v, l, &invalid_line);
3057 if (k < 0) {
3058 if (invalid_line)
3059 /* Allow reporting with a special code if the caller requested this */
3060 *invalid_config = true;
3061 else if (r == 0)
3062 /* The first error becomes our return value */
3063 r = k;
3064 }
3065 }
3066
3067 /* we have to determine age parameter for each entry of type X */
3068 ORDERED_HASHMAP_FOREACH(i, globs, iterator) {
3069 Iterator iter;
3070 Item *j, *candidate_item = NULL;
3071
3072 if (i->type != IGNORE_DIRECTORY_PATH)
3073 continue;
3074
3075 ORDERED_HASHMAP_FOREACH(j, items, iter) {
3076 if (!IN_SET(j->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA))
3077 continue;
3078
3079 if (path_equal(j->path, i->path)) {
3080 candidate_item = j;
3081 break;
3082 }
3083
3084 if ((!candidate_item && path_startswith(i->path, j->path)) ||
3085 (candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)))
3086 candidate_item = j;
3087 }
3088
3089 if (candidate_item && candidate_item->age_set) {
3090 i->age = candidate_item->age;
3091 i->age_set = true;
3092 }
3093 }
3094
3095 if (ferror(f)) {
3096 log_error_errno(errno, "Failed to read from file %s: %m", fn);
3097 if (r == 0)
3098 r = -EIO;
3099 }
3100
3101 return r;
3102 }
3103
3104 static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
3105 char **arg;
3106 int r;
3107
3108 STRV_FOREACH(arg, args) {
3109 r = read_config_file(config_dirs, *arg, false, invalid_config);
3110 if (r < 0)
3111 return r;
3112 }
3113
3114 return 0;
3115 }
3116
3117 static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
3118 _cleanup_strv_free_ char **files = NULL;
3119 _cleanup_free_ char *p = NULL;
3120 char **f;
3121 int r;
3122
3123 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
3124 if (r < 0)
3125 return r;
3126
3127 STRV_FOREACH(f, files)
3128 if (p && path_equal(*f, p)) {
3129 log_debug("Parsing arguments at position \"%s\"…", *f);
3130
3131 r = parse_arguments(config_dirs, args, invalid_config);
3132 if (r < 0)
3133 return r;
3134 } else
3135 /* Just warn, ignore result otherwise.
3136 * read_config_file() has some debug output, so no need to print anything. */
3137 (void) read_config_file(config_dirs, *f, true, invalid_config);
3138
3139 return 0;
3140 }
3141
3142 static int link_parent(ItemArray *a) {
3143 const char *path;
3144 char *prefix;
3145 int r;
3146
3147 assert(a);
3148
3149 /* Finds the closest "parent" item array for the specified item array. Then registers the specified item array
3150 * as child of it, and fills the parent in, linking them both ways. This allows us to later create parents
3151 * before their children, and clean up/remove children before their parents. */
3152
3153 if (a->n_items <= 0)
3154 return 0;
3155
3156 path = a->items[0].path;
3157 prefix = newa(char, strlen(path) + 1);
3158 PATH_FOREACH_PREFIX(prefix, path) {
3159 ItemArray *j;
3160
3161 j = ordered_hashmap_get(items, prefix);
3162 if (!j)
3163 j = ordered_hashmap_get(globs, prefix);
3164 if (j) {
3165 r = set_ensure_allocated(&j->children, NULL);
3166 if (r < 0)
3167 return log_oom();
3168
3169 r = set_put(j->children, a);
3170 if (r < 0)
3171 return log_oom();
3172
3173 a->parent = j;
3174 return 1;
3175 }
3176 }
3177
3178 return 0;
3179 }
3180
3181 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
3182 ItemArray, item_array_free);
3183
3184 static int run(int argc, char *argv[]) {
3185 _cleanup_strv_free_ char **config_dirs = NULL;
3186 bool invalid_config = false;
3187 Iterator iterator;
3188 ItemArray *a;
3189 enum {
3190 PHASE_REMOVE_AND_CLEAN,
3191 PHASE_CREATE,
3192 _PHASE_MAX
3193 } phase;
3194 int r, k;
3195
3196 r = parse_argv(argc, argv);
3197 if (r <= 0)
3198 return r;
3199
3200 log_setup_service();
3201
3202 /* Descending down file system trees might take a lot of fds */
3203 (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
3204
3205 if (arg_user) {
3206 r = user_config_paths(&config_dirs);
3207 if (r < 0)
3208 return log_error_errno(r, "Failed to initialize configuration directory list: %m");
3209 } else {
3210 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
3211 if (!config_dirs)
3212 return log_oom();
3213 }
3214
3215 if (DEBUG_LOGGING) {
3216 _cleanup_free_ char *t = NULL;
3217
3218 t = strv_join(config_dirs, "\n\t");
3219 if (t)
3220 log_debug("Looking for configuration files in (higher priority first):\n\t%s", t);
3221 }
3222
3223 if (arg_cat_config) {
3224 (void) pager_open(arg_pager_flags);
3225
3226 return cat_config(config_dirs, argv + optind);
3227 }
3228
3229 umask(0022);
3230
3231 mac_selinux_init();
3232
3233 items = ordered_hashmap_new(&item_array_hash_ops);
3234 globs = ordered_hashmap_new(&item_array_hash_ops);
3235 if (!items || !globs)
3236 return log_oom();
3237
3238 /* If command line arguments are specified along with --replace, read all
3239 * configuration files and insert the positional arguments at the specified
3240 * place. Otherwise, if command line arguments are specified, execute just
3241 * them, and finally, without --replace= or any positional arguments, just
3242 * read configuration and execute it.
3243 */
3244 if (arg_replace || optind >= argc)
3245 r = read_config_files(config_dirs, argv + optind, &invalid_config);
3246 else
3247 r = parse_arguments(config_dirs, argv + optind, &invalid_config);
3248 if (r < 0)
3249 return r;
3250
3251 /* Let's now link up all child/parent relationships */
3252 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3253 r = link_parent(a);
3254 if (r < 0)
3255 return r;
3256 }
3257 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3258 r = link_parent(a);
3259 if (r < 0)
3260 return r;
3261 }
3262
3263 /* If multiple operations are requested, let's first run the remove/clean operations, and only then the create
3264 * operations. i.e. that we first clean out the platform we then build on. */
3265 for (phase = 0; phase < _PHASE_MAX; phase++) {
3266 OperationMask op;
3267
3268 if (phase == PHASE_REMOVE_AND_CLEAN)
3269 op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
3270 else if (phase == PHASE_CREATE)
3271 op = arg_operation & OPERATION_CREATE;
3272 else
3273 assert_not_reached("unexpected phase");
3274
3275 if (op == 0) /* Nothing requested in this phase */
3276 continue;
3277
3278 /* The non-globbing ones usually create things, hence we apply them first */
3279 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3280 k = process_item_array(a, op);
3281 if (k < 0 && r >= 0)
3282 r = k;
3283 }
3284
3285 /* The globbing ones usually alter things, hence we apply them second. */
3286 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3287 k = process_item_array(a, op);
3288 if (k < 0 && r >= 0)
3289 r = k;
3290 }
3291 }
3292
3293 if (ERRNO_IS_RESOURCE(-r))
3294 return r;
3295 if (invalid_config)
3296 return EX_DATAERR;
3297 if (r < 0)
3298 return EX_CANTCREAT;
3299 return 0;
3300 }
3301
3302 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
Unnamed repository; edit this file 'description' to name the repository.