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Merge pull request #15910 from poettering/tmpfiles-pstore-tweak
[thirdparty/systemd.git] / src / tmpfiles / tmpfiles.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <errno.h>
4 #include <fcntl.h>
5 #include <fnmatch.h>
6 #include <getopt.h>
7 #include <limits.h>
8 #include <linux/fs.h>
9 #include <stdbool.h>
10 #include <stddef.h>
11 #include <stdlib.h>
12 #include <sys/file.h>
13 #include <sys/xattr.h>
14 #include <sysexits.h>
15 #include <time.h>
16 #include <unistd.h>
17
18 #include "sd-path.h"
19
20 #include "acl-util.h"
21 #include "alloc-util.h"
22 #include "btrfs-util.h"
23 #include "capability-util.h"
24 #include "chattr-util.h"
25 #include "conf-files.h"
26 #include "copy.h"
27 #include "def.h"
28 #include "dirent-util.h"
29 #include "escape.h"
30 #include "fd-util.h"
31 #include "fileio.h"
32 #include "format-util.h"
33 #include "fs-util.h"
34 #include "glob-util.h"
35 #include "io-util.h"
36 #include "label.h"
37 #include "log.h"
38 #include "macro.h"
39 #include "main-func.h"
40 #include "mkdir.h"
41 #include "mountpoint-util.h"
42 #include "offline-passwd.h"
43 #include "pager.h"
44 #include "parse-util.h"
45 #include "path-lookup.h"
46 #include "path-util.h"
47 #include "pretty-print.h"
48 #include "rlimit-util.h"
49 #include "rm-rf.h"
50 #include "selinux-util.h"
51 #include "set.h"
52 #include "sort-util.h"
53 #include "specifier.h"
54 #include "stat-util.h"
55 #include "stdio-util.h"
56 #include "string-table.h"
57 #include "string-util.h"
58 #include "strv.h"
59 #include "umask-util.h"
60 #include "user-util.h"
61
62 /* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
63 * them in the file system. This is intended to be used to create
64 * properly owned directories beneath /tmp, /var/tmp, /run, which are
65 * volatile and hence need to be recreated on bootup. */
66
67 typedef enum OperationMask {
68 OPERATION_CREATE = 1 << 0,
69 OPERATION_REMOVE = 1 << 1,
70 OPERATION_CLEAN = 1 << 2,
71 } OperationMask;
72
73 typedef enum ItemType {
74 /* These ones take file names */
75 CREATE_FILE = 'f',
76 TRUNCATE_FILE = 'F', /* deprecated: use f+ */
77 CREATE_DIRECTORY = 'd',
78 TRUNCATE_DIRECTORY = 'D',
79 CREATE_SUBVOLUME = 'v',
80 CREATE_SUBVOLUME_INHERIT_QUOTA = 'q',
81 CREATE_SUBVOLUME_NEW_QUOTA = 'Q',
82 CREATE_FIFO = 'p',
83 CREATE_SYMLINK = 'L',
84 CREATE_CHAR_DEVICE = 'c',
85 CREATE_BLOCK_DEVICE = 'b',
86 COPY_FILES = 'C',
87
88 /* These ones take globs */
89 WRITE_FILE = 'w',
90 EMPTY_DIRECTORY = 'e',
91 SET_XATTR = 't',
92 RECURSIVE_SET_XATTR = 'T',
93 SET_ACL = 'a',
94 RECURSIVE_SET_ACL = 'A',
95 SET_ATTRIBUTE = 'h',
96 RECURSIVE_SET_ATTRIBUTE = 'H',
97 IGNORE_PATH = 'x',
98 IGNORE_DIRECTORY_PATH = 'X',
99 REMOVE_PATH = 'r',
100 RECURSIVE_REMOVE_PATH = 'R',
101 RELABEL_PATH = 'z',
102 RECURSIVE_RELABEL_PATH = 'Z',
103 ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
104 } ItemType;
105
106 typedef struct Item {
107 ItemType type;
108
109 char *path;
110 char *argument;
111 char **xattrs;
112 #if HAVE_ACL
113 acl_t acl_access;
114 acl_t acl_default;
115 #endif
116 uid_t uid;
117 gid_t gid;
118 mode_t mode;
119 usec_t age;
120
121 dev_t major_minor;
122 unsigned attribute_value;
123 unsigned attribute_mask;
124
125 bool uid_set:1;
126 bool gid_set:1;
127 bool mode_set:1;
128 bool age_set:1;
129 bool mask_perms:1;
130 bool attribute_set:1;
131
132 bool keep_first_level:1;
133
134 bool append_or_force:1;
135
136 bool allow_failure:1;
137
138 OperationMask done;
139 } Item;
140
141 typedef struct ItemArray {
142 Item *items;
143 size_t n_items;
144 size_t allocated;
145
146 struct ItemArray *parent;
147 Set *children;
148 } ItemArray;
149
150 typedef enum DirectoryType {
151 DIRECTORY_RUNTIME,
152 DIRECTORY_STATE,
153 DIRECTORY_CACHE,
154 DIRECTORY_LOGS,
155 _DIRECTORY_TYPE_MAX,
156 } DirectoryType;
157
158 static bool arg_cat_config = false;
159 static bool arg_user = false;
160 static OperationMask arg_operation = 0;
161 static bool arg_boot = false;
162 static PagerFlags arg_pager_flags = 0;
163
164 static char **arg_include_prefixes = NULL;
165 static char **arg_exclude_prefixes = NULL;
166 static char *arg_root = NULL;
167 static char *arg_replace = NULL;
168
169 #define MAX_DEPTH 256
170
171 static OrderedHashmap *items = NULL, *globs = NULL;
172 static Set *unix_sockets = NULL;
173
174 STATIC_DESTRUCTOR_REGISTER(items, ordered_hashmap_freep);
175 STATIC_DESTRUCTOR_REGISTER(globs, ordered_hashmap_freep);
176 STATIC_DESTRUCTOR_REGISTER(unix_sockets, set_free_freep);
177 STATIC_DESTRUCTOR_REGISTER(arg_include_prefixes, freep);
178 STATIC_DESTRUCTOR_REGISTER(arg_exclude_prefixes, freep);
179 STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
180
181 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret);
182 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret);
183
184 static const Specifier specifier_table[] = {
185 { 'm', specifier_machine_id_safe, NULL },
186 { 'b', specifier_boot_id, NULL },
187 { 'H', specifier_host_name, NULL },
188 { 'l', specifier_short_host_name, NULL },
189 { 'v', specifier_kernel_release, NULL },
190 { 'a', specifier_architecture, NULL },
191 { 'o', specifier_os_id, NULL },
192 { 'w', specifier_os_version_id, NULL },
193 { 'B', specifier_os_build_id, NULL },
194 { 'W', specifier_os_variant_id, NULL },
195
196 { 'g', specifier_group_name, NULL },
197 { 'G', specifier_group_id, NULL },
198 { 'U', specifier_user_id, NULL },
199 { 'u', specifier_user_name, NULL },
200 { 'h', specifier_user_home, NULL },
201
202 { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
203 { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
204 { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
205 { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
206 { 'T', specifier_tmp_dir, NULL },
207 { 'V', specifier_var_tmp_dir, NULL },
208 {}
209 };
210
211 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret) {
212 int r;
213
214 /* If /etc/machine_id is missing or empty (e.g. in a chroot environment)
215 * return a recognizable error so that the caller can skip the rule
216 * gracefully. */
217
218 r = specifier_machine_id(specifier, data, userdata, ret);
219 if (IN_SET(r, -ENOENT, -ENOMEDIUM))
220 return -ENXIO;
221
222 return r;
223 }
224
225 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret) {
226 struct table_entry {
227 uint64_t type;
228 const char *suffix;
229 };
230
231 static const struct table_entry paths_system[] = {
232 [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
233 [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
234 [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
235 [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
236 };
237
238 static const struct table_entry paths_user[] = {
239 [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
240 [DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION },
241 [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
242 [DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
243 };
244
245 unsigned i;
246 const struct table_entry *paths;
247
248 assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
249 paths = arg_user ? paths_user : paths_system;
250
251 i = PTR_TO_UINT(data);
252 assert(i < ELEMENTSOF(paths_system));
253
254 return sd_path_lookup(paths[i].type, paths[i].suffix, ret);
255 }
256
257 static int log_unresolvable_specifier(const char *filename, unsigned line) {
258 static bool notified = false;
259
260 /* In system mode, this is called when /etc is not fully initialized (e.g.
261 * in a chroot environment) where some specifiers are unresolvable. In user
262 * mode, this is called when some variables are not defined. These cases are
263 * not considered as an error so log at LOG_NOTICE only for the first time
264 * and then downgrade this to LOG_DEBUG for the rest. */
265
266 log_syntax(NULL,
267 notified ? LOG_DEBUG : LOG_NOTICE,
268 filename, line, 0,
269 "Failed to resolve specifier: %s, skipping",
270 arg_user ? "Required $XDG_... variable not defined" : "uninitialized /etc detected");
271
272 if (!notified)
273 log_notice("All rules containing unresolvable specifiers will be skipped.");
274
275 notified = true;
276 return 0;
277 }
278
279 static int user_config_paths(char*** ret) {
280 _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
281 _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
282 _cleanup_strv_free_ char **res = NULL;
283 int r;
284
285 r = xdg_user_dirs(&config_dirs, &data_dirs);
286 if (r < 0)
287 return r;
288
289 r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
290 if (r < 0 && r != -ENXIO)
291 return r;
292
293 r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
294 if (r < 0 && r != -ENXIO)
295 return r;
296
297 r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
298 if (r < 0 && r != -ENXIO)
299 return r;
300
301 r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
302 if (r < 0)
303 return r;
304
305 r = strv_extend(&res, persistent_config);
306 if (r < 0)
307 return r;
308
309 r = strv_extend(&res, runtime_config);
310 if (r < 0)
311 return r;
312
313 r = strv_extend(&res, data_home);
314 if (r < 0)
315 return r;
316
317 r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
318 if (r < 0)
319 return r;
320
321 r = path_strv_make_absolute_cwd(res);
322 if (r < 0)
323 return r;
324
325 *ret = TAKE_PTR(res);
326 return 0;
327 }
328
329 static bool needs_glob(ItemType t) {
330 return IN_SET(t,
331 WRITE_FILE,
332 IGNORE_PATH,
333 IGNORE_DIRECTORY_PATH,
334 REMOVE_PATH,
335 RECURSIVE_REMOVE_PATH,
336 EMPTY_DIRECTORY,
337 ADJUST_MODE,
338 RELABEL_PATH,
339 RECURSIVE_RELABEL_PATH,
340 SET_XATTR,
341 RECURSIVE_SET_XATTR,
342 SET_ACL,
343 RECURSIVE_SET_ACL,
344 SET_ATTRIBUTE,
345 RECURSIVE_SET_ATTRIBUTE);
346 }
347
348 static bool takes_ownership(ItemType t) {
349 return IN_SET(t,
350 CREATE_FILE,
351 TRUNCATE_FILE,
352 CREATE_DIRECTORY,
353 EMPTY_DIRECTORY,
354 TRUNCATE_DIRECTORY,
355 CREATE_SUBVOLUME,
356 CREATE_SUBVOLUME_INHERIT_QUOTA,
357 CREATE_SUBVOLUME_NEW_QUOTA,
358 CREATE_FIFO,
359 CREATE_SYMLINK,
360 CREATE_CHAR_DEVICE,
361 CREATE_BLOCK_DEVICE,
362 COPY_FILES,
363 WRITE_FILE,
364 IGNORE_PATH,
365 IGNORE_DIRECTORY_PATH,
366 REMOVE_PATH,
367 RECURSIVE_REMOVE_PATH);
368 }
369
370 static struct Item* find_glob(OrderedHashmap *h, const char *match) {
371 ItemArray *j;
372 Iterator i;
373
374 ORDERED_HASHMAP_FOREACH(j, h, i) {
375 size_t n;
376
377 for (n = 0; n < j->n_items; n++) {
378 Item *item = j->items + n;
379
380 if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
381 return item;
382 }
383 }
384
385 return NULL;
386 }
387
388 static int load_unix_sockets(void) {
389 _cleanup_set_free_free_ Set *sockets = NULL;
390 _cleanup_fclose_ FILE *f = NULL;
391 int r;
392
393 if (unix_sockets)
394 return 0;
395
396 /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
397
398 sockets = set_new(&path_hash_ops);
399 if (!sockets)
400 return log_oom();
401
402 f = fopen("/proc/net/unix", "re");
403 if (!f)
404 return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
405 "Failed to open /proc/net/unix, ignoring: %m");
406
407 /* Skip header */
408 r = read_line(f, LONG_LINE_MAX, NULL);
409 if (r < 0)
410 return log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
411 if (r == 0)
412 return log_warning_errno(SYNTHETIC_ERRNO(EIO), "Premature end of file reading /proc/net/unix.");
413
414 for (;;) {
415 _cleanup_free_ char *line = NULL, *s = NULL;
416 char *p;
417
418 r = read_line(f, LONG_LINE_MAX, &line);
419 if (r < 0)
420 return log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
421 if (r == 0) /* EOF */
422 break;
423
424 p = strchr(line, ':');
425 if (!p)
426 continue;
427
428 if (strlen(p) < 37)
429 continue;
430
431 p += 37;
432 p += strspn(p, WHITESPACE);
433 p += strcspn(p, WHITESPACE); /* skip one more word */
434 p += strspn(p, WHITESPACE);
435
436 if (*p != '/')
437 continue;
438
439 s = strdup(p);
440 if (!s)
441 return log_oom();
442
443 path_simplify(s, false);
444
445 r = set_consume(sockets, s);
446 if (r == -EEXIST)
447 continue;
448 if (r < 0)
449 return log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
450
451 TAKE_PTR(s);
452 }
453
454 unix_sockets = TAKE_PTR(sockets);
455 return 1;
456 }
457
458 static bool unix_socket_alive(const char *fn) {
459 assert(fn);
460
461 if (load_unix_sockets() < 0)
462 return true; /* We don't know, so assume yes */
463
464 return !!set_get(unix_sockets, (char*) fn);
465 }
466
467 static DIR* xopendirat_nomod(int dirfd, const char *path) {
468 DIR *dir;
469
470 dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
471 if (dir)
472 return dir;
473
474 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
475 if (errno != EPERM)
476 return NULL;
477
478 dir = xopendirat(dirfd, path, O_NOFOLLOW);
479 if (!dir)
480 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
481
482 return dir;
483 }
484
485 static DIR* opendir_nomod(const char *path) {
486 return xopendirat_nomod(AT_FDCWD, path);
487 }
488
489 static int dir_cleanup(
490 Item *i,
491 const char *p,
492 DIR *d,
493 const struct stat *ds,
494 usec_t cutoff,
495 dev_t rootdev,
496 bool mountpoint,
497 int maxdepth,
498 bool keep_this_level) {
499
500 struct dirent *dent;
501 bool deleted = false;
502 int r = 0;
503
504 FOREACH_DIRENT_ALL(dent, d, break) {
505 struct stat s;
506 usec_t age;
507 _cleanup_free_ char *sub_path = NULL;
508
509 if (dot_or_dot_dot(dent->d_name))
510 continue;
511
512 if (fstatat(dirfd(d), dent->d_name, &s, AT_SYMLINK_NOFOLLOW) < 0) {
513 if (errno == ENOENT)
514 continue;
515
516 /* FUSE, NFS mounts, SELinux might return EACCES */
517 r = log_full_errno(errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
518 "stat(%s/%s) failed: %m", p, dent->d_name);
519 continue;
520 }
521
522 /* Stay on the same filesystem */
523 if (s.st_dev != rootdev) {
524 log_debug("Ignoring \"%s/%s\": different filesystem.", p, dent->d_name);
525 continue;
526 }
527
528 /* Try to detect bind mounts of the same filesystem instance; they
529 * do not differ in device major/minors. This type of query is not
530 * supported on all kernels or filesystem types though. */
531 if (S_ISDIR(s.st_mode)) {
532 int q;
533
534 q = fd_is_mount_point(dirfd(d), dent->d_name, 0);
535 if (q < 0)
536 log_debug_errno(q, "Failed to determine whether \"%s/%s\" is a mount point, ignoring: %m", p, dent->d_name);
537 else if (q > 0) {
538 log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.", p, dent->d_name);
539 continue;
540 }
541 }
542
543 sub_path = path_join(p, dent->d_name);
544 if (!sub_path) {
545 r = log_oom();
546 goto finish;
547 }
548
549 /* Is there an item configured for this path? */
550 if (ordered_hashmap_get(items, sub_path)) {
551 log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
552 continue;
553 }
554
555 if (find_glob(globs, sub_path)) {
556 log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
557 continue;
558 }
559
560 if (S_ISDIR(s.st_mode)) {
561 _cleanup_closedir_ DIR *sub_dir = NULL;
562
563 if (mountpoint &&
564 streq(dent->d_name, "lost+found") &&
565 s.st_uid == 0) {
566 log_debug("Ignoring directory \"%s\".", sub_path);
567 continue;
568 }
569
570 if (maxdepth <= 0)
571 log_warning("Reached max depth on \"%s\".", sub_path);
572 else {
573 int q;
574
575 sub_dir = xopendirat_nomod(dirfd(d), dent->d_name);
576 if (!sub_dir) {
577 if (errno != ENOENT)
578 r = log_warning_errno(errno, "Opening directory \"%s\" failed, ignoring: %m", sub_path);
579
580 continue;
581 }
582
583 if (flock(dirfd(sub_dir), LOCK_EX|LOCK_NB) < 0) {
584 log_debug_errno(errno, "Couldn't acquire shared BSD lock on directory \"%s\", skipping: %m", p);
585 continue;
586 }
587
588 q = dir_cleanup(i, sub_path, sub_dir, &s, cutoff, rootdev, false, maxdepth-1, false);
589 if (q < 0)
590 r = q;
591 }
592
593 /* Note: if you are wondering why we don't support the sticky bit for excluding
594 * directories from cleaning like we do it for other file system objects: well, the
595 * sticky bit already has a meaning for directories, so we don't want to overload
596 * that. */
597
598 if (keep_this_level) {
599 log_debug("Keeping directory \"%s\".", sub_path);
600 continue;
601 }
602
603 /* Ignore ctime, we change it when deleting */
604 age = timespec_load(&s.st_mtim);
605 if (age >= cutoff) {
606 char a[FORMAT_TIMESTAMP_MAX];
607 /* Follows spelling in stat(1). */
608 log_debug("Directory \"%s\": modify time %s is too new.",
609 sub_path,
610 format_timestamp_us(a, sizeof(a), age));
611 continue;
612 }
613
614 age = timespec_load(&s.st_atim);
615 if (age >= cutoff) {
616 char a[FORMAT_TIMESTAMP_MAX];
617 log_debug("Directory \"%s\": access time %s is too new.",
618 sub_path,
619 format_timestamp_us(a, sizeof(a), age));
620 continue;
621 }
622
623 log_debug("Removing directory \"%s\".", sub_path);
624 if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0)
625 if (!IN_SET(errno, ENOENT, ENOTEMPTY))
626 r = log_warning_errno(errno, "Failed to remove directory \"%s\", ignoring: %m", sub_path);
627
628 } else {
629 /* Skip files for which the sticky bit is set. These are semantics we define, and are
630 * unknown elsewhere. See XDG_RUNTIME_DIR specification for details. */
631 if (s.st_mode & S_ISVTX) {
632 log_debug("Skipping \"%s\": sticky bit set.", sub_path);
633 continue;
634 }
635
636 if (mountpoint &&
637 S_ISREG(s.st_mode) &&
638 s.st_uid == 0 &&
639 STR_IN_SET(dent->d_name,
640 ".journal",
641 "aquota.user",
642 "aquota.group")) {
643 log_debug("Skipping \"%s\".", sub_path);
644 continue;
645 }
646
647 /* Ignore sockets that are listed in /proc/net/unix */
648 if (S_ISSOCK(s.st_mode) && unix_socket_alive(sub_path)) {
649 log_debug("Skipping \"%s\": live socket.", sub_path);
650 continue;
651 }
652
653 /* Ignore device nodes */
654 if (S_ISCHR(s.st_mode) || S_ISBLK(s.st_mode)) {
655 log_debug("Skipping \"%s\": a device.", sub_path);
656 continue;
657 }
658
659 /* Keep files on this level around if this is requested */
660 if (keep_this_level) {
661 log_debug("Keeping \"%s\".", sub_path);
662 continue;
663 }
664
665 age = timespec_load(&s.st_mtim);
666 if (age >= cutoff) {
667 char a[FORMAT_TIMESTAMP_MAX];
668 /* Follows spelling in stat(1). */
669 log_debug("File \"%s\": modify time %s is too new.",
670 sub_path,
671 format_timestamp_us(a, sizeof(a), age));
672 continue;
673 }
674
675 age = timespec_load(&s.st_atim);
676 if (age >= cutoff) {
677 char a[FORMAT_TIMESTAMP_MAX];
678 log_debug("File \"%s\": access time %s is too new.",
679 sub_path,
680 format_timestamp_us(a, sizeof(a), age));
681 continue;
682 }
683
684 age = timespec_load(&s.st_ctim);
685 if (age >= cutoff) {
686 char a[FORMAT_TIMESTAMP_MAX];
687 log_debug("File \"%s\": change time %s is too new.",
688 sub_path,
689 format_timestamp_us(a, sizeof(a), age));
690 continue;
691 }
692
693 log_debug("Removing \"%s\".", sub_path);
694 if (unlinkat(dirfd(d), dent->d_name, 0) < 0)
695 if (errno != ENOENT)
696 r = log_warning_errno(errno, "Failed to remove \"%s\", ignoring: %m", sub_path);
697
698 deleted = true;
699 }
700 }
701
702 finish:
703 if (deleted) {
704 char a[FORMAT_TIMESTAMP_MAX], b[FORMAT_TIMESTAMP_MAX];
705 usec_t age1, age2;
706
707 age1 = timespec_load(&ds->st_atim);
708 age2 = timespec_load(&ds->st_mtim);
709
710 log_debug("Restoring access and modification time on \"%s\": %s, %s",
711 p,
712 format_timestamp_us(a, sizeof(a), age1),
713 format_timestamp_us(b, sizeof(b), age2));
714
715 /* Restore original directory timestamps */
716 if (futimens(dirfd(d), (struct timespec[]) {
717 ds->st_atim,
718 ds->st_mtim }) < 0)
719 log_warning_errno(errno, "Failed to revert timestamps of '%s', ignoring: %m", p);
720 }
721
722 return r;
723 }
724
725 static bool dangerous_hardlinks(void) {
726 _cleanup_free_ char *value = NULL;
727 static int cached = -1;
728 int r;
729
730 /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
731 * what the upstream default is. */
732
733 if (cached >= 0)
734 return cached;
735
736 r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
737 if (r < 0) {
738 log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
739 return true;
740 }
741
742 r = parse_boolean(value);
743 if (r < 0) {
744 log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
745 return true;
746 }
747
748 cached = r == 0;
749 return cached;
750 }
751
752 static bool hardlink_vulnerable(const struct stat *st) {
753 assert(st);
754
755 return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
756 }
757
758 static mode_t process_mask_perms(mode_t mode, mode_t current) {
759
760 if ((current & 0111) == 0)
761 mode &= ~0111;
762 if ((current & 0222) == 0)
763 mode &= ~0222;
764 if ((current & 0444) == 0)
765 mode &= ~0444;
766 if (!S_ISDIR(current))
767 mode &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
768
769 return mode;
770 }
771
772 static int fd_set_perms(Item *i, int fd, const char *path, const struct stat *st) {
773 struct stat stbuf;
774 mode_t new_mode;
775 bool do_chown;
776
777 assert(i);
778 assert(fd);
779 assert(path);
780
781 if (!i->mode_set && !i->uid_set && !i->gid_set)
782 goto shortcut;
783
784 if (!st) {
785 if (fstat(fd, &stbuf) < 0)
786 return log_error_errno(errno, "fstat(%s) failed: %m", path);
787 st = &stbuf;
788 }
789
790 if (hardlink_vulnerable(st))
791 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
792 "Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
793 path);
794
795 /* Do we need a chown()? */
796 do_chown =
797 (i->uid_set && i->uid != st->st_uid) ||
798 (i->gid_set && i->gid != st->st_gid);
799
800 /* Calculate the mode to apply */
801 new_mode = i->mode_set ? (i->mask_perms ?
802 process_mask_perms(i->mode, st->st_mode) :
803 i->mode) :
804 (st->st_mode & 07777);
805
806 if (i->mode_set && do_chown) {
807 /* Before we issue the chmod() let's reduce the access mode to the common bits of the old and
808 * the new mode. That way there's no time window where the file exists under the old owner
809 * with more than the old access modes — and not under the new owner with more than the new
810 * access modes either. */
811
812 if (S_ISLNK(st->st_mode))
813 log_debug("Skipping temporary mode fix for symlink %s.", path);
814 else {
815 mode_t m = new_mode & st->st_mode; /* Mask new mode by old mode */
816
817 if (((m ^ st->st_mode) & 07777) == 0)
818 log_debug("\"%s\" matches temporary mode %o already.", path, m);
819 else {
820 log_debug("Temporarily changing \"%s\" to mode %o.", path, m);
821 if (fchmod_opath(fd, m) < 0)
822 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
823 }
824 }
825 }
826
827 if (do_chown) {
828 log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT,
829 path,
830 i->uid_set ? i->uid : UID_INVALID,
831 i->gid_set ? i->gid : GID_INVALID);
832
833 if (fchownat(fd,
834 "",
835 i->uid_set ? i->uid : UID_INVALID,
836 i->gid_set ? i->gid : GID_INVALID,
837 AT_EMPTY_PATH) < 0)
838 return log_error_errno(errno, "fchownat() of %s failed: %m", path);
839 }
840
841 /* Now, apply the final mode. We do this in two cases: when the user set a mode explicitly, or after a
842 * chown(), since chown()'s mangle the access mode in regards to sgid/suid in some conditions. */
843 if (i->mode_set || do_chown) {
844 if (S_ISLNK(st->st_mode))
845 log_debug("Skipping mode fix for symlink %s.", path);
846 else {
847 /* Check if the chmod() is unnecessary. Note that if we did a chown() before we always
848 * chmod() here again, since it might have mangled the bits. */
849 if (!do_chown && ((new_mode ^ st->st_mode) & 07777) == 0)
850 log_debug("\"%s\" matches mode %o already.", path, new_mode);
851 else {
852 log_debug("Changing \"%s\" to mode %o.", path, new_mode);
853 if (fchmod_opath(fd, new_mode) < 0)
854 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
855 }
856 }
857 }
858
859 shortcut:
860 return label_fix(path, 0);
861 }
862
863 static int path_open_parent_safe(const char *path) {
864 _cleanup_free_ char *dn = NULL;
865 int r, fd;
866
867 if (path_equal(path, "/") || !path_is_normalized(path))
868 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
869 "Failed to open parent of '%s': invalid path.",
870 path);
871
872 dn = dirname_malloc(path);
873 if (!dn)
874 return log_oom();
875
876 r = chase_symlinks(dn, arg_root, CHASE_SAFE|CHASE_WARN, NULL, &fd);
877 if (r < 0 && r != -ENOLINK)
878 return log_error_errno(r, "Failed to validate path %s: %m", path);
879
880 return r < 0 ? r : fd;
881 }
882
883 static int path_open_safe(const char *path) {
884 int r, fd;
885
886 /* path_open_safe() returns a file descriptor opened with O_PATH after
887 * verifying that the path doesn't contain unsafe transitions, except
888 * for its final component as the function does not follow symlink. */
889
890 assert(path);
891
892 if (!path_is_normalized(path))
893 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
894 "Failed to open invalid path '%s'.",
895 path);
896
897 r = chase_symlinks(path, arg_root, CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL, &fd);
898 if (r < 0 && r != -ENOLINK)
899 return log_error_errno(r, "Failed to validate path %s: %m", path);
900
901 return r < 0 ? r : fd;
902 }
903
904 static int path_set_perms(Item *i, const char *path) {
905 _cleanup_close_ int fd = -1;
906
907 assert(i);
908 assert(path);
909
910 fd = path_open_safe(path);
911 if (fd < 0)
912 return fd;
913
914 return fd_set_perms(i, fd, path, NULL);
915 }
916
917 static int parse_xattrs_from_arg(Item *i) {
918 const char *p;
919 int r;
920
921 assert(i);
922 assert(i->argument);
923
924 p = i->argument;
925
926 for (;;) {
927 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
928
929 r = extract_first_word(&p, &xattr, NULL, EXTRACT_UNQUOTE|EXTRACT_CUNESCAPE);
930 if (r < 0)
931 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
932 if (r <= 0)
933 break;
934
935 r = split_pair(xattr, "=", &name, &value);
936 if (r < 0) {
937 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
938 continue;
939 }
940
941 if (isempty(name) || isempty(value)) {
942 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
943 continue;
944 }
945
946 if (strv_push_pair(&i->xattrs, name, value) < 0)
947 return log_oom();
948
949 name = value = NULL;
950 }
951
952 return 0;
953 }
954
955 static int fd_set_xattrs(Item *i, int fd, const char *path, const struct stat *st) {
956 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
957 char **name, **value;
958
959 assert(i);
960 assert(fd);
961 assert(path);
962
963 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
964
965 STRV_FOREACH_PAIR(name, value, i->xattrs) {
966 log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
967 if (setxattr(procfs_path, *name, *value, strlen(*value), 0) < 0)
968 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
969 *name, *value, path);
970 }
971 return 0;
972 }
973
974 static int path_set_xattrs(Item *i, const char *path) {
975 _cleanup_close_ int fd = -1;
976
977 assert(i);
978 assert(path);
979
980 fd = path_open_safe(path);
981 if (fd < 0)
982 return fd;
983
984 return fd_set_xattrs(i, fd, path, NULL);
985 }
986
987 static int parse_acls_from_arg(Item *item) {
988 #if HAVE_ACL
989 int r;
990
991 assert(item);
992
993 /* If append_or_force (= modify) is set, we will not modify the acl
994 * afterwards, so the mask can be added now if necessary. */
995
996 r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->append_or_force);
997 if (r < 0)
998 log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
999 #else
1000 log_warning_errno(SYNTHETIC_ERRNO(ENOSYS), "ACLs are not supported. Ignoring");
1001 #endif
1002
1003 return 0;
1004 }
1005
1006 #if HAVE_ACL
1007 static int path_set_acl(const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) {
1008 _cleanup_(acl_free_charpp) char *t = NULL;
1009 _cleanup_(acl_freep) acl_t dup = NULL;
1010 int r;
1011
1012 /* Returns 0 for success, positive error if already warned,
1013 * negative error otherwise. */
1014
1015 if (modify) {
1016 r = acls_for_file(path, type, acl, &dup);
1017 if (r < 0)
1018 return r;
1019
1020 r = calc_acl_mask_if_needed(&dup);
1021 if (r < 0)
1022 return r;
1023 } else {
1024 dup = acl_dup(acl);
1025 if (!dup)
1026 return -errno;
1027
1028 /* the mask was already added earlier if needed */
1029 }
1030
1031 r = add_base_acls_if_needed(&dup, path);
1032 if (r < 0)
1033 return r;
1034
1035 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
1036 log_debug("Setting %s ACL %s on %s.",
1037 type == ACL_TYPE_ACCESS ? "access" : "default",
1038 strna(t), pretty);
1039
1040 r = acl_set_file(path, type, dup);
1041 if (r < 0)
1042 /* Return positive to indicate we already warned */
1043 return -log_error_errno(errno,
1044 "Setting %s ACL \"%s\" on %s failed: %m",
1045 type == ACL_TYPE_ACCESS ? "access" : "default",
1046 strna(t), pretty);
1047
1048 return 0;
1049 }
1050 #endif
1051
1052 static int fd_set_acls(Item *item, int fd, const char *path, const struct stat *st) {
1053 int r = 0;
1054 #if HAVE_ACL
1055 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1056 struct stat stbuf;
1057
1058 assert(item);
1059 assert(fd);
1060 assert(path);
1061
1062 if (!st) {
1063 if (fstat(fd, &stbuf) < 0)
1064 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1065 st = &stbuf;
1066 }
1067
1068 if (hardlink_vulnerable(st))
1069 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
1070 "Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
1071 path);
1072
1073 if (S_ISLNK(st->st_mode)) {
1074 log_debug("Skipping ACL fix for symlink %s.", path);
1075 return 0;
1076 }
1077
1078 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1079
1080 if (item->acl_access)
1081 r = path_set_acl(procfs_path, path, ACL_TYPE_ACCESS, item->acl_access, item->append_or_force);
1082
1083 /* set only default acls to folders */
1084 if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
1085 r = path_set_acl(procfs_path, path, ACL_TYPE_DEFAULT, item->acl_default, item->append_or_force);
1086
1087 if (r > 0)
1088 return -r; /* already warned */
1089
1090 /* The above procfs paths don't work if /proc is not mounted. */
1091 if (r == -ENOENT && proc_mounted() == 0)
1092 r = -ENOSYS;
1093
1094 if (r == -EOPNOTSUPP) {
1095 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1096 return 0;
1097 }
1098 if (r < 0)
1099 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1100 #endif
1101 return r;
1102 }
1103
1104 static int path_set_acls(Item *item, const char *path) {
1105 int r = 0;
1106 #if HAVE_ACL
1107 _cleanup_close_ int fd = -1;
1108
1109 assert(item);
1110 assert(path);
1111
1112 fd = path_open_safe(path);
1113 if (fd < 0)
1114 return fd;
1115
1116 r = fd_set_acls(item, fd, path, NULL);
1117 #endif
1118 return r;
1119 }
1120
1121 static int parse_attribute_from_arg(Item *item) {
1122
1123 static const struct {
1124 char character;
1125 unsigned value;
1126 } attributes[] = {
1127 { 'A', FS_NOATIME_FL }, /* do not update atime */
1128 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1129 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1130 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1131 { 'c', FS_COMPR_FL }, /* Compress file */
1132 { 'd', FS_NODUMP_FL }, /* do not dump file */
1133 { 'e', FS_EXTENT_FL }, /* Extents */
1134 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1135 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1136 { 's', FS_SECRM_FL }, /* Secure deletion */
1137 { 'u', FS_UNRM_FL }, /* Undelete */
1138 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1139 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1140 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1141 { 'P', FS_PROJINHERIT_FL }, /* Inherit the quota project ID */
1142 };
1143
1144 enum {
1145 MODE_ADD,
1146 MODE_DEL,
1147 MODE_SET
1148 } mode = MODE_ADD;
1149
1150 unsigned value = 0, mask = 0;
1151 const char *p;
1152
1153 assert(item);
1154
1155 p = item->argument;
1156 if (p) {
1157 if (*p == '+') {
1158 mode = MODE_ADD;
1159 p++;
1160 } else if (*p == '-') {
1161 mode = MODE_DEL;
1162 p++;
1163 } else if (*p == '=') {
1164 mode = MODE_SET;
1165 p++;
1166 }
1167 }
1168
1169 if (isempty(p) && mode != MODE_SET)
1170 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1171 "Setting file attribute on '%s' needs an attribute specification.",
1172 item->path);
1173
1174 for (; p && *p ; p++) {
1175 unsigned i, v;
1176
1177 for (i = 0; i < ELEMENTSOF(attributes); i++)
1178 if (*p == attributes[i].character)
1179 break;
1180
1181 if (i >= ELEMENTSOF(attributes))
1182 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1183 "Unknown file attribute '%c' on '%s'.",
1184 *p, item->path);
1185
1186 v = attributes[i].value;
1187
1188 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1189
1190 mask |= v;
1191 }
1192
1193 if (mode == MODE_SET)
1194 mask |= CHATTR_ALL_FL;
1195
1196 assert(mask != 0);
1197
1198 item->attribute_mask = mask;
1199 item->attribute_value = value;
1200 item->attribute_set = true;
1201
1202 return 0;
1203 }
1204
1205 static int fd_set_attribute(Item *item, int fd, const char *path, const struct stat *st) {
1206 _cleanup_close_ int procfs_fd = -1;
1207 struct stat stbuf;
1208 unsigned f;
1209 int r;
1210
1211 assert(item);
1212 assert(fd);
1213 assert(path);
1214
1215 if (!item->attribute_set || item->attribute_mask == 0)
1216 return 0;
1217
1218 if (!st) {
1219 if (fstat(fd, &stbuf) < 0)
1220 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1221 st = &stbuf;
1222 }
1223
1224 /* Issuing the file attribute ioctls on device nodes is not
1225 * safe, as that will be delivered to the drivers, not the
1226 * file system containing the device node. */
1227 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
1228 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1229 "Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
1230 path);
1231
1232 f = item->attribute_value & item->attribute_mask;
1233
1234 /* Mask away directory-specific flags */
1235 if (!S_ISDIR(st->st_mode))
1236 f &= ~FS_DIRSYNC_FL;
1237
1238 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1239 if (procfs_fd < 0)
1240 return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
1241
1242 r = chattr_fd(procfs_fd, f, item->attribute_mask, NULL);
1243 if (r < 0)
1244 log_full_errno(IN_SET(r, -ENOTTY, -EOPNOTSUPP) ? LOG_DEBUG : LOG_WARNING,
1245 r,
1246 "Cannot set file attribute for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1247 path, item->attribute_value, item->attribute_mask);
1248
1249 return 0;
1250 }
1251
1252 static int path_set_attribute(Item *item, const char *path) {
1253 _cleanup_close_ int fd = -1;
1254
1255 if (!item->attribute_set || item->attribute_mask == 0)
1256 return 0;
1257
1258 fd = path_open_safe(path);
1259 if (fd < 0)
1260 return fd;
1261
1262 return fd_set_attribute(item, fd, path, NULL);
1263 }
1264
1265 static int write_one_file(Item *i, const char *path) {
1266 _cleanup_close_ int fd = -1, dir_fd = -1;
1267 char *bn;
1268 int r;
1269
1270 assert(i);
1271 assert(path);
1272 assert(i->argument);
1273 assert(i->type == WRITE_FILE);
1274
1275 /* Validate the path and keep the fd on the directory for opening the
1276 * file so we're sure that it can't be changed behind our back. */
1277 dir_fd = path_open_parent_safe(path);
1278 if (dir_fd < 0)
1279 return dir_fd;
1280
1281 bn = basename(path);
1282
1283 /* Follows symlinks */
1284 fd = openat(dir_fd, bn,
1285 O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY|(i->append_or_force ? O_APPEND : 0),
1286 i->mode);
1287 if (fd < 0) {
1288 if (errno == ENOENT) {
1289 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1290 return 0;
1291 }
1292
1293 if (i->allow_failure)
1294 return log_debug_errno(errno, "Failed to open file \"%s\", ignoring: %m", path);
1295
1296 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1297 }
1298
1299 /* 'w' is allowed to write into any kind of files. */
1300 log_debug("Writing to \"%s\".", path);
1301
1302 r = loop_write(fd, i->argument, strlen(i->argument), false);
1303 if (r < 0)
1304 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1305
1306 return fd_set_perms(i, fd, path, NULL);
1307 }
1308
1309 static int create_file(Item *i, const char *path) {
1310 _cleanup_close_ int fd = -1, dir_fd = -1;
1311 struct stat stbuf, *st = NULL;
1312 int r = 0;
1313 char *bn;
1314
1315 assert(i);
1316 assert(path);
1317 assert(i->type == CREATE_FILE);
1318
1319 /* 'f' operates on regular files exclusively. */
1320
1321 /* Validate the path and keep the fd on the directory for opening the
1322 * file so we're sure that it can't be changed behind our back. */
1323 dir_fd = path_open_parent_safe(path);
1324 if (dir_fd < 0)
1325 return dir_fd;
1326
1327 bn = basename(path);
1328
1329 RUN_WITH_UMASK(0000) {
1330 mac_selinux_create_file_prepare(path, S_IFREG);
1331 fd = openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1332 mac_selinux_create_file_clear();
1333 }
1334
1335 if (fd < 0) {
1336 /* Even on a read-only filesystem, open(2) returns EEXIST if the
1337 * file already exists. It returns EROFS only if it needs to
1338 * create the file. */
1339 if (errno != EEXIST)
1340 return log_error_errno(errno, "Failed to create file %s: %m", path);
1341
1342 /* Re-open the file. At that point it must exist since open(2)
1343 * failed with EEXIST. We still need to check if the perms/mode
1344 * need to be changed. For read-only filesystems, we let
1345 * fd_set_perms() report the error if the perms need to be
1346 * modified. */
1347 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1348 if (fd < 0)
1349 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1350
1351 if (fstat(fd, &stbuf) < 0)
1352 return log_error_errno(errno, "stat(%s) failed: %m", path);
1353
1354 if (!S_ISREG(stbuf.st_mode)) {
1355 log_error("%s exists and is not a regular file.", path);
1356 return -EEXIST;
1357 }
1358
1359 st = &stbuf;
1360 } else {
1361
1362 log_debug("\"%s\" has been created.", path);
1363
1364 if (i->argument) {
1365 log_debug("Writing to \"%s\".", path);
1366
1367 r = loop_write(fd, i->argument, strlen(i->argument), false);
1368 if (r < 0)
1369 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1370 }
1371 }
1372
1373 return fd_set_perms(i, fd, path, st);
1374 }
1375
1376 static int truncate_file(Item *i, const char *path) {
1377 _cleanup_close_ int fd = -1, dir_fd = -1;
1378 struct stat stbuf, *st = NULL;
1379 bool erofs = false;
1380 int r = 0;
1381 char *bn;
1382
1383 assert(i);
1384 assert(path);
1385 assert(i->type == TRUNCATE_FILE || (i->type == CREATE_FILE && i->append_or_force));
1386
1387 /* We want to operate on regular file exclusively especially since
1388 * O_TRUNC is unspecified if the file is neither a regular file nor a
1389 * fifo nor a terminal device. Therefore we first open the file and make
1390 * sure it's a regular one before truncating it. */
1391
1392 /* Validate the path and keep the fd on the directory for opening the
1393 * file so we're sure that it can't be changed behind our back. */
1394 dir_fd = path_open_parent_safe(path);
1395 if (dir_fd < 0)
1396 return dir_fd;
1397
1398 bn = basename(path);
1399
1400 RUN_WITH_UMASK(0000) {
1401 mac_selinux_create_file_prepare(path, S_IFREG);
1402 fd = openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1403 mac_selinux_create_file_clear();
1404 }
1405
1406 if (fd < 0) {
1407 if (errno != EROFS)
1408 return log_error_errno(errno, "Failed to open/create file %s: %m", path);
1409
1410 /* On a read-only filesystem, we don't want to fail if the
1411 * target is already empty and the perms are set. So we still
1412 * proceed with the sanity checks and let the remaining
1413 * operations fail with EROFS if they try to modify the target
1414 * file. */
1415
1416 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1417 if (fd < 0) {
1418 if (errno == ENOENT) {
1419 log_error("Cannot create file %s on a read-only file system.", path);
1420 return -EROFS;
1421 }
1422
1423 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1424 }
1425
1426 erofs = true;
1427 }
1428
1429 if (fstat(fd, &stbuf) < 0)
1430 return log_error_errno(errno, "stat(%s) failed: %m", path);
1431
1432 if (!S_ISREG(stbuf.st_mode)) {
1433 log_error("%s exists and is not a regular file.", path);
1434 return -EEXIST;
1435 }
1436
1437 if (stbuf.st_size > 0) {
1438 if (ftruncate(fd, 0) < 0) {
1439 r = erofs ? -EROFS : -errno;
1440 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1441 }
1442 } else
1443 st = &stbuf;
1444
1445 log_debug("\"%s\" has been created.", path);
1446
1447 if (i->argument) {
1448 log_debug("Writing to \"%s\".", path);
1449
1450 r = loop_write(fd, i->argument, strlen(i->argument), false);
1451 if (r < 0) {
1452 r = erofs ? -EROFS : r;
1453 return log_error_errno(r, "Failed to write file %s: %m", path);
1454 }
1455 }
1456
1457 return fd_set_perms(i, fd, path, st);
1458 }
1459
1460 static int copy_files(Item *i) {
1461 _cleanup_close_ int dfd = -1, fd = -1;
1462 char *bn;
1463 int r;
1464
1465 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1466
1467 bn = basename(i->path);
1468
1469 /* Validate the path and use the returned directory fd for copying the
1470 * target so we're sure that the path can't be changed behind our
1471 * back. */
1472 dfd = path_open_parent_safe(i->path);
1473 if (dfd < 0)
1474 return dfd;
1475
1476 r = copy_tree_at(AT_FDCWD, i->argument,
1477 dfd, bn,
1478 i->uid_set ? i->uid : UID_INVALID,
1479 i->gid_set ? i->gid : GID_INVALID,
1480 COPY_REFLINK | COPY_MERGE_EMPTY | COPY_MAC_CREATE);
1481 if (r < 0) {
1482 struct stat a, b;
1483
1484 /* If the target already exists on read-only filesystems, trying
1485 * to create the target will not fail with EEXIST but with
1486 * EROFS. */
1487 if (r == -EROFS && faccessat(dfd, bn, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
1488 r = -EEXIST;
1489
1490 if (r != -EEXIST)
1491 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1492
1493 if (stat(i->argument, &a) < 0)
1494 return log_error_errno(errno, "stat(%s) failed: %m", i->argument);
1495
1496 if (fstatat(dfd, bn, &b, AT_SYMLINK_NOFOLLOW) < 0)
1497 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1498
1499 if ((a.st_mode ^ b.st_mode) & S_IFMT) {
1500 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1501 return 0;
1502 }
1503 }
1504
1505 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1506 if (fd < 0)
1507 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1508
1509 return fd_set_perms(i, fd, i->path, NULL);
1510 }
1511
1512 typedef enum {
1513 CREATION_NORMAL,
1514 CREATION_EXISTING,
1515 CREATION_FORCE,
1516 _CREATION_MODE_MAX,
1517 _CREATION_MODE_INVALID = -1
1518 } CreationMode;
1519
1520 static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = {
1521 [CREATION_NORMAL] = "Created",
1522 [CREATION_EXISTING] = "Found existing",
1523 [CREATION_FORCE] = "Created replacement",
1524 };
1525
1526 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
1527
1528 static int create_directory_or_subvolume(const char *path, mode_t mode, bool subvol, CreationMode *creation) {
1529 _cleanup_close_ int pfd = -1;
1530 CreationMode c;
1531 int r;
1532
1533 assert(path);
1534
1535 if (!creation)
1536 creation = &c;
1537
1538 pfd = path_open_parent_safe(path);
1539 if (pfd < 0)
1540 return pfd;
1541
1542 if (subvol) {
1543 if (btrfs_is_subvol(empty_to_root(arg_root)) <= 0)
1544
1545 /* Don't create a subvolume unless the root directory is
1546 * one, too. We do this under the assumption that if the
1547 * root directory is just a plain directory (i.e. very
1548 * light-weight), we shouldn't try to split it up into
1549 * subvolumes (i.e. more heavy-weight). Thus, chroot()
1550 * environments and suchlike will get a full brtfs
1551 * subvolume set up below their tree only if they
1552 * specifically set up a btrfs subvolume for the root
1553 * dir too. */
1554
1555 subvol = false;
1556 else {
1557 RUN_WITH_UMASK((~mode) & 0777)
1558 r = btrfs_subvol_make_fd(pfd, basename(path));
1559 }
1560 } else
1561 r = 0;
1562
1563 if (!subvol || r == -ENOTTY)
1564 RUN_WITH_UMASK(0000)
1565 r = mkdirat_label(pfd, basename(path), mode);
1566
1567 if (r < 0) {
1568 int k;
1569
1570 if (!IN_SET(r, -EEXIST, -EROFS))
1571 return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", path);
1572
1573 k = is_dir_fd(pfd);
1574 if (k == -ENOENT && r == -EROFS)
1575 return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", path);
1576 if (k < 0)
1577 return log_error_errno(k, "Failed to check if %s exists: %m", path);
1578 if (!k) {
1579 log_warning("\"%s\" already exists and is not a directory.", path);
1580 return -EEXIST;
1581 }
1582
1583 *creation = CREATION_EXISTING;
1584 } else
1585 *creation = CREATION_NORMAL;
1586
1587 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(*creation), path);
1588
1589 r = openat(pfd, basename(path), O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
1590 if (r < 0)
1591 return log_error_errno(errno, "Failed to open directory '%s': %m", basename(path));
1592
1593 return r;
1594 }
1595
1596 static int create_directory(Item *i, const char *path) {
1597 _cleanup_close_ int fd = -1;
1598
1599 assert(i);
1600 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
1601
1602 fd = create_directory_or_subvolume(path, i->mode, false, NULL);
1603 if (fd == -EEXIST)
1604 return 0;
1605 if (fd < 0)
1606 return fd;
1607
1608 return fd_set_perms(i, fd, path, NULL);
1609 }
1610
1611 static int create_subvolume(Item *i, const char *path) {
1612 _cleanup_close_ int fd = -1;
1613 CreationMode creation;
1614 int r, q = 0;
1615
1616 assert(i);
1617 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
1618
1619 fd = create_directory_or_subvolume(path, i->mode, true, &creation);
1620 if (fd == -EEXIST)
1621 return 0;
1622 if (fd < 0)
1623 return fd;
1624
1625 if (creation == CREATION_NORMAL &&
1626 IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
1627 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
1628 if (r == -ENOTTY)
1629 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
1630 else if (r == -EROFS)
1631 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
1632 else if (r == -ENOTCONN)
1633 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
1634 else if (r < 0)
1635 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
1636 else if (r > 0)
1637 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
1638 else if (r == 0)
1639 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
1640 }
1641
1642 r = fd_set_perms(i, fd, path, NULL);
1643 if (q < 0) /* prefer the quota change error from above */
1644 return q;
1645
1646 return r;
1647 }
1648
1649 static int empty_directory(Item *i, const char *path) {
1650 int r;
1651
1652 assert(i);
1653 assert(i->type == EMPTY_DIRECTORY);
1654
1655 r = is_dir(path, false);
1656 if (r == -ENOENT) {
1657 /* Option "e" operates only on existing objects. Do not
1658 * print errors about non-existent files or directories */
1659 log_debug("Skipping missing directory: %s", path);
1660 return 0;
1661 }
1662 if (r < 0)
1663 return log_error_errno(r, "is_dir() failed on path %s: %m", path);
1664 if (r == 0)
1665 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1666 "'%s' already exists and is not a directory.",
1667 path);
1668
1669 return path_set_perms(i, path);
1670 }
1671
1672 static int create_device(Item *i, mode_t file_type) {
1673 _cleanup_close_ int dfd = -1, fd = -1;
1674 CreationMode creation;
1675 char *bn;
1676 int r;
1677
1678 assert(i);
1679 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
1680
1681 bn = basename(i->path);
1682
1683 /* Validate the path and use the returned directory fd for copying the
1684 * target so we're sure that the path can't be changed behind our
1685 * back. */
1686 dfd = path_open_parent_safe(i->path);
1687 if (dfd < 0)
1688 return dfd;
1689
1690 RUN_WITH_UMASK(0000) {
1691 mac_selinux_create_file_prepare(i->path, file_type);
1692 r = mknodat(dfd, bn, i->mode | file_type, i->major_minor);
1693 mac_selinux_create_file_clear();
1694 }
1695
1696 if (r < 0) {
1697 struct stat st;
1698
1699 if (errno == EPERM) {
1700 log_debug("We lack permissions, possibly because of cgroup configuration; "
1701 "skipping creation of device node %s.", i->path);
1702 return 0;
1703 }
1704
1705 if (errno != EEXIST)
1706 return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
1707
1708 if (fstatat(dfd, bn, &st, 0) < 0)
1709 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1710
1711 if ((st.st_mode & S_IFMT) != file_type) {
1712
1713 if (i->append_or_force) {
1714
1715 RUN_WITH_UMASK(0000) {
1716 mac_selinux_create_file_prepare(i->path, file_type);
1717 /* FIXME: need to introduce mknodat_atomic() */
1718 r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
1719 mac_selinux_create_file_clear();
1720 }
1721
1722 if (r < 0)
1723 return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
1724 creation = CREATION_FORCE;
1725 } else {
1726 log_debug("%s is not a device node.", i->path);
1727 return 0;
1728 }
1729 } else
1730 creation = CREATION_EXISTING;
1731 } else
1732 creation = CREATION_NORMAL;
1733
1734 log_debug("%s %s device node \"%s\" %u:%u.",
1735 creation_mode_verb_to_string(creation),
1736 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
1737 i->path, major(i->mode), minor(i->mode));
1738
1739 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1740 if (fd < 0)
1741 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1742
1743 return fd_set_perms(i, fd, i->path, NULL);
1744 }
1745
1746 static int create_fifo(Item *i, const char *path) {
1747 _cleanup_close_ int pfd = -1, fd = -1;
1748 CreationMode creation;
1749 struct stat st;
1750 char *bn;
1751 int r;
1752
1753 pfd = path_open_parent_safe(path);
1754 if (pfd < 0)
1755 return pfd;
1756
1757 bn = basename(path);
1758
1759 RUN_WITH_UMASK(0000) {
1760 mac_selinux_create_file_prepare(path, S_IFIFO);
1761 r = mkfifoat(pfd, bn, i->mode);
1762 mac_selinux_create_file_clear();
1763 }
1764
1765 if (r < 0) {
1766 if (errno != EEXIST)
1767 return log_error_errno(errno, "Failed to create fifo %s: %m", path);
1768
1769 if (fstatat(pfd, bn, &st, AT_SYMLINK_NOFOLLOW) < 0)
1770 return log_error_errno(errno, "stat(%s) failed: %m", path);
1771
1772 if (!S_ISFIFO(st.st_mode)) {
1773
1774 if (i->append_or_force) {
1775 RUN_WITH_UMASK(0000) {
1776 mac_selinux_create_file_prepare(path, S_IFIFO);
1777 r = mkfifoat_atomic(pfd, bn, i->mode);
1778 mac_selinux_create_file_clear();
1779 }
1780
1781 if (r < 0)
1782 return log_error_errno(r, "Failed to create fifo %s: %m", path);
1783 creation = CREATION_FORCE;
1784 } else {
1785 log_warning("\"%s\" already exists and is not a fifo.", path);
1786 return 0;
1787 }
1788 } else
1789 creation = CREATION_EXISTING;
1790 } else
1791 creation = CREATION_NORMAL;
1792
1793 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), path);
1794
1795 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1796 if (fd < 0)
1797 return log_error_errno(errno, "Failed to openat(%s): %m", path);
1798
1799 return fd_set_perms(i, fd, i->path, NULL);
1800 }
1801
1802 typedef int (*action_t)(Item *i, const char *path);
1803 typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st);
1804
1805 static int item_do(Item *i, int fd, const char *path, fdaction_t action) {
1806 struct stat st;
1807 int r = 0, q;
1808
1809 assert(i);
1810 assert(path);
1811 assert(fd >= 0);
1812
1813 if (fstat(fd, &st) < 0) {
1814 r = log_error_errno(errno, "fstat() on file failed: %m");
1815 goto finish;
1816 }
1817
1818 /* This returns the first error we run into, but nevertheless
1819 * tries to go on */
1820 r = action(i, fd, path, &st);
1821
1822 if (S_ISDIR(st.st_mode)) {
1823 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1824 _cleanup_closedir_ DIR *d = NULL;
1825 struct dirent *de;
1826
1827 /* The passed 'fd' was opened with O_PATH. We need to convert
1828 * it into a 'regular' fd before reading the directory content. */
1829 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1830
1831 d = opendir(procfs_path);
1832 if (!d) {
1833 log_error_errno(errno, "Failed to opendir() '%s': %m", procfs_path);
1834 if (r == 0)
1835 r = -errno;
1836 goto finish;
1837 }
1838
1839 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
1840 int de_fd;
1841
1842 if (dot_or_dot_dot(de->d_name))
1843 continue;
1844
1845 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1846 if (de_fd < 0)
1847 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
1848 else {
1849 _cleanup_free_ char *de_path = NULL;
1850
1851 de_path = path_join(path, de->d_name);
1852 if (!de_path)
1853 q = log_oom();
1854 else
1855 /* Pass ownership of dirent fd over */
1856 q = item_do(i, de_fd, de_path, action);
1857 }
1858
1859 if (q < 0 && r == 0)
1860 r = q;
1861 }
1862 }
1863 finish:
1864 safe_close(fd);
1865 return r;
1866 }
1867
1868 static int glob_item(Item *i, action_t action) {
1869 _cleanup_globfree_ glob_t g = {
1870 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1871 };
1872 int r = 0, k;
1873 char **fn;
1874
1875 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1876 if (k < 0 && k != -ENOENT)
1877 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1878
1879 STRV_FOREACH(fn, g.gl_pathv) {
1880 k = action(i, *fn);
1881 if (k < 0 && r == 0)
1882 r = k;
1883 }
1884
1885 return r;
1886 }
1887
1888 static int glob_item_recursively(Item *i, fdaction_t action) {
1889 _cleanup_globfree_ glob_t g = {
1890 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1891 };
1892 int r = 0, k;
1893 char **fn;
1894
1895 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1896 if (k < 0 && k != -ENOENT)
1897 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1898
1899 STRV_FOREACH(fn, g.gl_pathv) {
1900 _cleanup_close_ int fd = -1;
1901
1902 /* Make sure we won't trigger/follow file object (such as
1903 * device nodes, automounts, ...) pointed out by 'fn' with
1904 * O_PATH. Note, when O_PATH is used, flags other than
1905 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
1906
1907 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
1908 if (fd < 0) {
1909 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
1910 if (r == 0)
1911 r = -errno;
1912 continue;
1913 }
1914
1915 k = item_do(i, fd, *fn, action);
1916 if (k < 0 && r == 0)
1917 r = k;
1918
1919 /* we passed fd ownership to the previous call */
1920 fd = -1;
1921 }
1922
1923 return r;
1924 }
1925
1926 static int create_item(Item *i) {
1927 CreationMode creation;
1928 int r = 0;
1929
1930 assert(i);
1931
1932 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
1933
1934 switch (i->type) {
1935
1936 case IGNORE_PATH:
1937 case IGNORE_DIRECTORY_PATH:
1938 case REMOVE_PATH:
1939 case RECURSIVE_REMOVE_PATH:
1940 return 0;
1941
1942 case TRUNCATE_FILE:
1943 case CREATE_FILE:
1944 RUN_WITH_UMASK(0000)
1945 (void) mkdir_parents_label(i->path, 0755);
1946
1947 if ((i->type == CREATE_FILE && i->append_or_force) || i->type == TRUNCATE_FILE)
1948 r = truncate_file(i, i->path);
1949 else
1950 r = create_file(i, i->path);
1951
1952 if (r < 0)
1953 return r;
1954 break;
1955
1956 case COPY_FILES:
1957 RUN_WITH_UMASK(0000)
1958 (void) mkdir_parents_label(i->path, 0755);
1959
1960 r = copy_files(i);
1961 if (r < 0)
1962 return r;
1963 break;
1964
1965 case WRITE_FILE:
1966 r = glob_item(i, write_one_file);
1967 if (r < 0)
1968 return r;
1969
1970 break;
1971
1972 case CREATE_DIRECTORY:
1973 case TRUNCATE_DIRECTORY:
1974 RUN_WITH_UMASK(0000)
1975 (void) mkdir_parents_label(i->path, 0755);
1976
1977 r = create_directory(i, i->path);
1978 if (r < 0)
1979 return r;
1980 break;
1981
1982 case CREATE_SUBVOLUME:
1983 case CREATE_SUBVOLUME_INHERIT_QUOTA:
1984 case CREATE_SUBVOLUME_NEW_QUOTA:
1985 RUN_WITH_UMASK(0000)
1986 (void) mkdir_parents_label(i->path, 0755);
1987
1988 r = create_subvolume(i, i->path);
1989 if (r < 0)
1990 return r;
1991 break;
1992
1993 case EMPTY_DIRECTORY:
1994 r = glob_item(i, empty_directory);
1995 if (r < 0)
1996 return r;
1997 break;
1998
1999 case CREATE_FIFO:
2000 RUN_WITH_UMASK(0000)
2001 (void) mkdir_parents_label(i->path, 0755);
2002
2003 r = create_fifo(i, i->path);
2004 if (r < 0)
2005 return r;
2006 break;
2007
2008 case CREATE_SYMLINK: {
2009 RUN_WITH_UMASK(0000)
2010 (void) mkdir_parents_label(i->path, 0755);
2011
2012 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2013 r = symlink(i->argument, i->path);
2014 mac_selinux_create_file_clear();
2015
2016 if (r < 0) {
2017 _cleanup_free_ char *x = NULL;
2018
2019 if (errno != EEXIST)
2020 return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);
2021
2022 r = readlink_malloc(i->path, &x);
2023 if (r < 0 || !streq(i->argument, x)) {
2024
2025 if (i->append_or_force) {
2026 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2027 r = symlink_atomic(i->argument, i->path);
2028 mac_selinux_create_file_clear();
2029
2030 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2031 r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL);
2032 if (r < 0)
2033 return log_error_errno(r, "rm -fr %s failed: %m", i->path);
2034
2035 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2036 r = symlink(i->argument, i->path) < 0 ? -errno : 0;
2037 mac_selinux_create_file_clear();
2038 }
2039 if (r < 0)
2040 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2041
2042 creation = CREATION_FORCE;
2043 } else {
2044 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2045 return 0;
2046 }
2047 } else
2048 creation = CREATION_EXISTING;
2049 } else
2050
2051 creation = CREATION_NORMAL;
2052 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2053 break;
2054 }
2055
2056 case CREATE_BLOCK_DEVICE:
2057 case CREATE_CHAR_DEVICE:
2058 if (have_effective_cap(CAP_MKNOD) == 0) {
2059 /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
2060 * case to avoid noise, and we don't support virtualized devices in containers anyway. */
2061
2062 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2063 return 0;
2064 }
2065
2066 RUN_WITH_UMASK(0000)
2067 (void) mkdir_parents_label(i->path, 0755);
2068
2069 r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2070 if (r < 0)
2071 return r;
2072
2073 break;
2074
2075 case ADJUST_MODE:
2076 case RELABEL_PATH:
2077 r = glob_item(i, path_set_perms);
2078 if (r < 0)
2079 return r;
2080 break;
2081
2082 case RECURSIVE_RELABEL_PATH:
2083 r = glob_item_recursively(i, fd_set_perms);
2084 if (r < 0)
2085 return r;
2086 break;
2087
2088 case SET_XATTR:
2089 r = glob_item(i, path_set_xattrs);
2090 if (r < 0)
2091 return r;
2092 break;
2093
2094 case RECURSIVE_SET_XATTR:
2095 r = glob_item_recursively(i, fd_set_xattrs);
2096 if (r < 0)
2097 return r;
2098 break;
2099
2100 case SET_ACL:
2101 r = glob_item(i, path_set_acls);
2102 if (r < 0)
2103 return r;
2104 break;
2105
2106 case RECURSIVE_SET_ACL:
2107 r = glob_item_recursively(i, fd_set_acls);
2108 if (r < 0)
2109 return r;
2110 break;
2111
2112 case SET_ATTRIBUTE:
2113 r = glob_item(i, path_set_attribute);
2114 if (r < 0)
2115 return r;
2116 break;
2117
2118 case RECURSIVE_SET_ATTRIBUTE:
2119 r = glob_item_recursively(i, fd_set_attribute);
2120 if (r < 0)
2121 return r;
2122 break;
2123 }
2124
2125 return 0;
2126 }
2127
2128 static int remove_item_instance(Item *i, const char *instance) {
2129 int r;
2130
2131 assert(i);
2132
2133 switch (i->type) {
2134
2135 case REMOVE_PATH:
2136 if (remove(instance) < 0 && errno != ENOENT)
2137 return log_error_errno(errno, "rm(%s): %m", instance);
2138
2139 break;
2140
2141 case RECURSIVE_REMOVE_PATH:
2142 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2143 log_debug("rm -rf \"%s\"", instance);
2144 r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL);
2145 if (r < 0 && r != -ENOENT)
2146 return log_error_errno(r, "rm_rf(%s): %m", instance);
2147
2148 break;
2149
2150 default:
2151 assert_not_reached("wut?");
2152 }
2153
2154 return 0;
2155 }
2156
2157 static int remove_item(Item *i) {
2158 int r;
2159
2160 assert(i);
2161
2162 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
2163
2164 switch (i->type) {
2165
2166 case TRUNCATE_DIRECTORY:
2167 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2168 log_debug("rm -rf \"%s\"", i->path);
2169 r = rm_rf(i->path, REMOVE_PHYSICAL);
2170 if (r < 0 && r != -ENOENT)
2171 return log_error_errno(r, "rm_rf(%s): %m", i->path);
2172
2173 return 0;
2174
2175 case REMOVE_PATH:
2176 case RECURSIVE_REMOVE_PATH:
2177 return glob_item(i, remove_item_instance);
2178
2179 default:
2180 return 0;
2181 }
2182 }
2183
2184 static int clean_item_instance(Item *i, const char* instance) {
2185 _cleanup_closedir_ DIR *d = NULL;
2186 struct stat s, ps;
2187 bool mountpoint;
2188 usec_t cutoff, n;
2189 char timestamp[FORMAT_TIMESTAMP_MAX];
2190
2191 assert(i);
2192
2193 if (!i->age_set)
2194 return 0;
2195
2196 n = now(CLOCK_REALTIME);
2197 if (n < i->age)
2198 return 0;
2199
2200 cutoff = n - i->age;
2201
2202 d = opendir_nomod(instance);
2203 if (!d) {
2204 if (IN_SET(errno, ENOENT, ENOTDIR)) {
2205 log_debug_errno(errno, "Directory \"%s\": %m", instance);
2206 return 0;
2207 }
2208
2209 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
2210 }
2211
2212 if (fstat(dirfd(d), &s) < 0)
2213 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
2214
2215 if (!S_ISDIR(s.st_mode))
2216 return log_error_errno(SYNTHETIC_ERRNO(ENOTDIR),
2217 "%s is not a directory.", i->path);
2218
2219 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
2220 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
2221
2222 mountpoint = s.st_dev != ps.st_dev || s.st_ino == ps.st_ino;
2223
2224 log_debug("Cleanup threshold for %s \"%s\" is %s",
2225 mountpoint ? "mount point" : "directory",
2226 instance,
2227 format_timestamp_us(timestamp, sizeof(timestamp), cutoff));
2228
2229 return dir_cleanup(i, instance, d, &s, cutoff, s.st_dev, mountpoint,
2230 MAX_DEPTH, i->keep_first_level);
2231 }
2232
2233 static int clean_item(Item *i) {
2234 assert(i);
2235
2236 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
2237
2238 switch (i->type) {
2239 case CREATE_DIRECTORY:
2240 case CREATE_SUBVOLUME:
2241 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2242 case CREATE_SUBVOLUME_NEW_QUOTA:
2243 case TRUNCATE_DIRECTORY:
2244 case IGNORE_PATH:
2245 case COPY_FILES:
2246 clean_item_instance(i, i->path);
2247 return 0;
2248 case EMPTY_DIRECTORY:
2249 case IGNORE_DIRECTORY_PATH:
2250 return glob_item(i, clean_item_instance);
2251 default:
2252 return 0;
2253 }
2254 }
2255
2256 static int process_item(Item *i, OperationMask operation) {
2257 OperationMask todo;
2258 int r, q, p;
2259
2260 assert(i);
2261
2262 todo = operation & ~i->done;
2263 if (todo == 0) /* Everything already done? */
2264 return 0;
2265
2266 i->done |= operation;
2267
2268 r = chase_symlinks(i->path, arg_root, CHASE_NO_AUTOFS|CHASE_WARN, NULL, NULL);
2269 if (r == -EREMOTE) {
2270 log_notice_errno(r, "Skipping %s", i->path);
2271 return 0;
2272 }
2273 if (r < 0)
2274 log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
2275
2276 r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(i) : 0;
2277 /* Failure can only be tolerated for create */
2278 if (i->allow_failure)
2279 r = 0;
2280
2281 q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(i) : 0;
2282 p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(i) : 0;
2283
2284 return r < 0 ? r :
2285 q < 0 ? q :
2286 p;
2287 }
2288
2289 static int process_item_array(ItemArray *array, OperationMask operation) {
2290 int r = 0;
2291 size_t n;
2292
2293 assert(array);
2294
2295 /* Create any parent first. */
2296 if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
2297 r = process_item_array(array->parent, operation & OPERATION_CREATE);
2298
2299 /* Clean up all children first */
2300 if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) {
2301 Iterator i;
2302 ItemArray *c;
2303
2304 SET_FOREACH(c, array->children, i) {
2305 int k;
2306
2307 k = process_item_array(c, operation & (OPERATION_REMOVE|OPERATION_CLEAN));
2308 if (k < 0 && r == 0)
2309 r = k;
2310 }
2311 }
2312
2313 for (n = 0; n < array->n_items; n++) {
2314 int k;
2315
2316 k = process_item(array->items + n, operation);
2317 if (k < 0 && r == 0)
2318 r = k;
2319 }
2320
2321 return r;
2322 }
2323
2324 static void item_free_contents(Item *i) {
2325 assert(i);
2326 free(i->path);
2327 free(i->argument);
2328 strv_free(i->xattrs);
2329
2330 #if HAVE_ACL
2331 acl_free(i->acl_access);
2332 acl_free(i->acl_default);
2333 #endif
2334 }
2335
2336 static ItemArray* item_array_free(ItemArray *a) {
2337 size_t n;
2338
2339 if (!a)
2340 return NULL;
2341
2342 for (n = 0; n < a->n_items; n++)
2343 item_free_contents(a->items + n);
2344
2345 set_free(a->children);
2346 free(a->items);
2347 return mfree(a);
2348 }
2349
2350 static int item_compare(const Item *a, const Item *b) {
2351 /* Make sure that the ownership taking item is put first, so
2352 * that we first create the node, and then can adjust it */
2353
2354 if (takes_ownership(a->type) && !takes_ownership(b->type))
2355 return -1;
2356 if (!takes_ownership(a->type) && takes_ownership(b->type))
2357 return 1;
2358
2359 return CMP(a->type, b->type);
2360 }
2361
2362 static bool item_compatible(Item *a, Item *b) {
2363 assert(a);
2364 assert(b);
2365 assert(streq(a->path, b->path));
2366
2367 if (takes_ownership(a->type) && takes_ownership(b->type))
2368 /* check if the items are the same */
2369 return streq_ptr(a->argument, b->argument) &&
2370
2371 a->uid_set == b->uid_set &&
2372 a->uid == b->uid &&
2373
2374 a->gid_set == b->gid_set &&
2375 a->gid == b->gid &&
2376
2377 a->mode_set == b->mode_set &&
2378 a->mode == b->mode &&
2379
2380 a->age_set == b->age_set &&
2381 a->age == b->age &&
2382
2383 a->mask_perms == b->mask_perms &&
2384
2385 a->keep_first_level == b->keep_first_level &&
2386
2387 a->major_minor == b->major_minor;
2388
2389 return true;
2390 }
2391
2392 static bool should_include_path(const char *path) {
2393 char **prefix;
2394
2395 STRV_FOREACH(prefix, arg_exclude_prefixes)
2396 if (path_startswith(path, *prefix)) {
2397 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
2398 path, *prefix);
2399 return false;
2400 }
2401
2402 STRV_FOREACH(prefix, arg_include_prefixes)
2403 if (path_startswith(path, *prefix)) {
2404 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
2405 return true;
2406 }
2407
2408 /* no matches, so we should include this path only if we
2409 * have no whitelist at all */
2410 if (strv_isempty(arg_include_prefixes))
2411 return true;
2412
2413 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
2414 return false;
2415 }
2416
2417 static int specifier_expansion_from_arg(Item *i) {
2418 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
2419 char **xattr;
2420 int r;
2421
2422 assert(i);
2423
2424 if (!i->argument)
2425 return 0;
2426
2427 switch (i->type) {
2428 case COPY_FILES:
2429 case CREATE_SYMLINK:
2430 case CREATE_FILE:
2431 case TRUNCATE_FILE:
2432 case WRITE_FILE:
2433 r = cunescape(i->argument, 0, &unescaped);
2434 if (r < 0)
2435 return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument);
2436
2437 r = specifier_printf(unescaped, specifier_table, NULL, &resolved);
2438 if (r < 0)
2439 return r;
2440
2441 free_and_replace(i->argument, resolved);
2442 break;
2443
2444 case SET_XATTR:
2445 case RECURSIVE_SET_XATTR:
2446 STRV_FOREACH(xattr, i->xattrs) {
2447 r = specifier_printf(*xattr, specifier_table, NULL, &resolved);
2448 if (r < 0)
2449 return r;
2450
2451 free_and_replace(*xattr, resolved);
2452 }
2453 break;
2454
2455 default:
2456 break;
2457 }
2458 return 0;
2459 }
2460
2461 static int patch_var_run(const char *fname, unsigned line, char **path) {
2462 const char *k;
2463 char *n;
2464
2465 assert(path);
2466 assert(*path);
2467
2468 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
2469 * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
2470 * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
2471 * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
2472 * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
2473 * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
2474 * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
2475 * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
2476 * the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
2477
2478 k = path_startswith(*path, "/var/run/");
2479 if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
2480 return 0;
2481
2482 n = path_join("/run", k);
2483 if (!n)
2484 return log_oom();
2485
2486 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
2487 * there's no immediate need for action by the user. However, in the interest of making things less confusing
2488 * to the user, let's still inform the user that these snippets should really be updated. */
2489 log_syntax(NULL, LOG_NOTICE, fname, line, 0, "Line references path below legacy directory /var/run/, updating %s → %s; please update the tmpfiles.d/ drop-in file accordingly.", *path, n);
2490
2491 free_and_replace(*path, n);
2492
2493 return 0;
2494 }
2495
2496 static int find_uid(const char *user, uid_t *ret_uid, Hashmap **cache) {
2497 int r;
2498
2499 assert(user);
2500 assert(ret_uid);
2501
2502 /* First: parse as numeric UID string */
2503 r = parse_uid(user, ret_uid);
2504 if (r >= 0)
2505 return r;
2506
2507 /* Second: pass to NSS if we are running "online" */
2508 if (!arg_root)
2509 return get_user_creds(&user, ret_uid, NULL, NULL, NULL, 0);
2510
2511 /* Third, synthesize "root" unconditionally */
2512 if (streq(user, "root")) {
2513 *ret_uid = 0;
2514 return 0;
2515 }
2516
2517 /* Fourth: use fgetpwent() to read /etc/passwd directly, if we are "offline" */
2518 return name_to_uid_offline(arg_root, user, ret_uid, cache);
2519 }
2520
2521 static int find_gid(const char *group, gid_t *ret_gid, Hashmap **cache) {
2522 int r;
2523
2524 assert(group);
2525 assert(ret_gid);
2526
2527 /* First: parse as numeric GID string */
2528 r = parse_gid(group, ret_gid);
2529 if (r >= 0)
2530 return r;
2531
2532 /* Second: pass to NSS if we are running "online" */
2533 if (!arg_root)
2534 return get_group_creds(&group, ret_gid, 0);
2535
2536 /* Third, synthesize "root" unconditionally */
2537 if (streq(group, "root")) {
2538 *ret_gid = 0;
2539 return 0;
2540 }
2541
2542 /* Fourth: use fgetgrent() to read /etc/group directly, if we are "offline" */
2543 return name_to_gid_offline(arg_root, group, ret_gid, cache);
2544 }
2545
2546 static int parse_line(
2547 const char *fname,
2548 unsigned line,
2549 const char *buffer,
2550 bool *invalid_config,
2551 Hashmap **uid_cache,
2552 Hashmap **gid_cache) {
2553
2554 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
2555 _cleanup_(item_free_contents) Item i = {};
2556 ItemArray *existing;
2557 OrderedHashmap *h;
2558 int r, pos;
2559 bool append_or_force = false, boot = false, allow_failure = false;
2560
2561 assert(fname);
2562 assert(line >= 1);
2563 assert(buffer);
2564
2565 r = extract_many_words(
2566 &buffer,
2567 NULL,
2568 EXTRACT_UNQUOTE,
2569 &action,
2570 &path,
2571 &mode,
2572 &user,
2573 &group,
2574 &age,
2575 NULL);
2576 if (r < 0) {
2577 if (IN_SET(r, -EINVAL, -EBADSLT))
2578 /* invalid quoting and such or an unknown specifier */
2579 *invalid_config = true;
2580 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to parse line: %m");
2581 } else if (r < 2) {
2582 *invalid_config = true;
2583 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Syntax error.");
2584 }
2585
2586 if (!empty_or_dash(buffer)) {
2587 i.argument = strdup(buffer);
2588 if (!i.argument)
2589 return log_oom();
2590 }
2591
2592 if (isempty(action)) {
2593 *invalid_config = true;
2594 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Command too short '%s'.", action);
2595 }
2596
2597 for (pos = 1; action[pos]; pos++) {
2598 if (action[pos] == '!' && !boot)
2599 boot = true;
2600 else if (action[pos] == '+' && !append_or_force)
2601 append_or_force = true;
2602 else if (action[pos] == '-' && !allow_failure)
2603 allow_failure = true;
2604 else {
2605 *invalid_config = true;
2606 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Unknown modifiers in command '%s'", action);
2607 }
2608 }
2609
2610 if (boot && !arg_boot) {
2611 log_syntax(NULL, LOG_DEBUG, fname, line, 0, "Ignoring entry %s \"%s\" because --boot is not specified.", action, path);
2612 return 0;
2613 }
2614
2615 i.type = action[0];
2616 i.append_or_force = append_or_force;
2617 i.allow_failure = allow_failure;
2618
2619 r = specifier_printf(path, specifier_table, NULL, &i.path);
2620 if (r == -ENXIO)
2621 return log_unresolvable_specifier(fname, line);
2622 if (r < 0) {
2623 if (IN_SET(r, -EINVAL, -EBADSLT))
2624 *invalid_config = true;
2625 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to replace specifiers in '%s': %m", path);
2626 }
2627
2628 r = patch_var_run(fname, line, &i.path);
2629 if (r < 0)
2630 return r;
2631
2632 switch (i.type) {
2633
2634 case CREATE_DIRECTORY:
2635 case CREATE_SUBVOLUME:
2636 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2637 case CREATE_SUBVOLUME_NEW_QUOTA:
2638 case EMPTY_DIRECTORY:
2639 case TRUNCATE_DIRECTORY:
2640 case CREATE_FIFO:
2641 case IGNORE_PATH:
2642 case IGNORE_DIRECTORY_PATH:
2643 case REMOVE_PATH:
2644 case RECURSIVE_REMOVE_PATH:
2645 case ADJUST_MODE:
2646 case RELABEL_PATH:
2647 case RECURSIVE_RELABEL_PATH:
2648 if (i.argument)
2649 log_syntax(NULL, LOG_WARNING, fname, line, 0, "%c lines don't take argument fields, ignoring.", i.type);
2650
2651 break;
2652
2653 case CREATE_FILE:
2654 case TRUNCATE_FILE:
2655 break;
2656
2657 case CREATE_SYMLINK:
2658 if (!i.argument) {
2659 i.argument = path_join("/usr/share/factory", i.path);
2660 if (!i.argument)
2661 return log_oom();
2662 }
2663 break;
2664
2665 case WRITE_FILE:
2666 if (!i.argument) {
2667 *invalid_config = true;
2668 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Write file requires argument.");
2669 }
2670 break;
2671
2672 case COPY_FILES:
2673 if (!i.argument) {
2674 i.argument = path_join("/usr/share/factory", i.path);
2675 if (!i.argument)
2676 return log_oom();
2677
2678 } else if (!path_is_absolute(i.argument)) {
2679 *invalid_config = true;
2680 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Source path '%s' is not absolute.", i.argument);
2681
2682 }
2683
2684 if (!empty_or_root(arg_root)) {
2685 char *p;
2686
2687 p = path_join(arg_root, i.argument);
2688 if (!p)
2689 return log_oom();
2690 free_and_replace(i.argument, p);
2691 }
2692
2693 path_simplify(i.argument, false);
2694 break;
2695
2696 case CREATE_CHAR_DEVICE:
2697 case CREATE_BLOCK_DEVICE:
2698 if (!i.argument) {
2699 *invalid_config = true;
2700 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Device file requires argument.");
2701 }
2702
2703 r = parse_dev(i.argument, &i.major_minor);
2704 if (r < 0) {
2705 *invalid_config = true;
2706 return log_syntax(NULL, LOG_ERR, fname, line, r, "Can't parse device file major/minor '%s'.", i.argument);
2707 }
2708
2709 break;
2710
2711 case SET_XATTR:
2712 case RECURSIVE_SET_XATTR:
2713 if (!i.argument) {
2714 *invalid_config = true;
2715 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2716 "Set extended attribute requires argument.");
2717 }
2718 r = parse_xattrs_from_arg(&i);
2719 if (r < 0)
2720 return r;
2721 break;
2722
2723 case SET_ACL:
2724 case RECURSIVE_SET_ACL:
2725 if (!i.argument) {
2726 *invalid_config = true;
2727 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2728 "Set ACLs requires argument.");
2729 }
2730 r = parse_acls_from_arg(&i);
2731 if (r < 0)
2732 return r;
2733 break;
2734
2735 case SET_ATTRIBUTE:
2736 case RECURSIVE_SET_ATTRIBUTE:
2737 if (!i.argument) {
2738 *invalid_config = true;
2739 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2740 "Set file attribute requires argument.");
2741 }
2742 r = parse_attribute_from_arg(&i);
2743 if (IN_SET(r, -EINVAL, -EBADSLT))
2744 *invalid_config = true;
2745 if (r < 0)
2746 return r;
2747 break;
2748
2749 default:
2750 *invalid_config = true;
2751 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2752 "Unknown command type '%c'.", (char) i.type);
2753 }
2754
2755 if (!path_is_absolute(i.path)) {
2756 *invalid_config = true;
2757 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2758 "Path '%s' not absolute.", i.path);
2759 }
2760
2761 path_simplify(i.path, false);
2762
2763 if (!should_include_path(i.path))
2764 return 0;
2765
2766 r = specifier_expansion_from_arg(&i);
2767 if (r == -ENXIO)
2768 return log_unresolvable_specifier(fname, line);
2769 if (r < 0) {
2770 if (IN_SET(r, -EINVAL, -EBADSLT))
2771 *invalid_config = true;
2772 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to substitute specifiers in argument: %m");
2773 }
2774
2775 if (!empty_or_root(arg_root)) {
2776 char *p;
2777
2778 p = path_join(arg_root, i.path);
2779 if (!p)
2780 return log_oom();
2781 free_and_replace(i.path, p);
2782 }
2783
2784 if (!empty_or_dash(user)) {
2785 r = find_uid(user, &i.uid, uid_cache);
2786 if (r < 0) {
2787 *invalid_config = true;
2788 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve user '%s': %m", user);
2789 }
2790
2791 i.uid_set = true;
2792 }
2793
2794 if (!empty_or_dash(group)) {
2795 r = find_gid(group, &i.gid, gid_cache);
2796 if (r < 0) {
2797 *invalid_config = true;
2798 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve group '%s'.", group);
2799 }
2800
2801 i.gid_set = true;
2802 }
2803
2804 if (!empty_or_dash(mode)) {
2805 const char *mm = mode;
2806 unsigned m;
2807
2808 if (*mm == '~') {
2809 i.mask_perms = true;
2810 mm++;
2811 }
2812
2813 r = parse_mode(mm, &m);
2814 if (r < 0) {
2815 *invalid_config = true;
2816 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid mode '%s'.", mode);
2817 }
2818
2819 i.mode = m;
2820 i.mode_set = true;
2821 } else
2822 i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
2823
2824 if (!empty_or_dash(age)) {
2825 const char *a = age;
2826
2827 if (*a == '~') {
2828 i.keep_first_level = true;
2829 a++;
2830 }
2831
2832 r = parse_sec(a, &i.age);
2833 if (r < 0) {
2834 *invalid_config = true;
2835 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age '%s'.", age);
2836 }
2837
2838 i.age_set = true;
2839 }
2840
2841 h = needs_glob(i.type) ? globs : items;
2842
2843 existing = ordered_hashmap_get(h, i.path);
2844 if (existing) {
2845 size_t n;
2846
2847 for (n = 0; n < existing->n_items; n++) {
2848 if (!item_compatible(existing->items + n, &i) && !i.append_or_force) {
2849 log_syntax(NULL, LOG_NOTICE, fname, line, 0, "Duplicate line for path \"%s\", ignoring.", i.path);
2850 return 0;
2851 }
2852 }
2853 } else {
2854 existing = new0(ItemArray, 1);
2855 if (!existing)
2856 return log_oom();
2857
2858 r = ordered_hashmap_put(h, i.path, existing);
2859 if (r < 0) {
2860 free(existing);
2861 return log_oom();
2862 }
2863 }
2864
2865 if (!GREEDY_REALLOC(existing->items, existing->allocated, existing->n_items + 1))
2866 return log_oom();
2867
2868 existing->items[existing->n_items++] = i;
2869 i = (struct Item) {};
2870
2871 /* Sort item array, to enforce stable ordering of application */
2872 typesafe_qsort(existing->items, existing->n_items, item_compare);
2873
2874 return 0;
2875 }
2876
2877 static int cat_config(char **config_dirs, char **args) {
2878 _cleanup_strv_free_ char **files = NULL;
2879 int r;
2880
2881 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
2882 if (r < 0)
2883 return r;
2884
2885 return cat_files(NULL, files, 0);
2886 }
2887
2888 static int help(void) {
2889 _cleanup_free_ char *link = NULL;
2890 int r;
2891
2892 r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
2893 if (r < 0)
2894 return log_oom();
2895
2896 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
2897 "Creates, deletes and cleans up volatile and temporary files and directories.\n\n"
2898 " -h --help Show this help\n"
2899 " --user Execute user configuration\n"
2900 " --version Show package version\n"
2901 " --cat-config Show configuration files\n"
2902 " --create Create marked files/directories\n"
2903 " --clean Clean up marked directories\n"
2904 " --remove Remove marked files/directories\n"
2905 " --boot Execute actions only safe at boot\n"
2906 " --prefix=PATH Only apply rules with the specified prefix\n"
2907 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
2908 " --root=PATH Operate on an alternate filesystem root\n"
2909 " --replace=PATH Treat arguments as replacement for PATH\n"
2910 " --no-pager Do not pipe output into a pager\n"
2911 "\nSee the %s for details.\n"
2912 , program_invocation_short_name
2913 , link
2914 );
2915
2916 return 0;
2917 }
2918
2919 static int parse_argv(int argc, char *argv[]) {
2920
2921 enum {
2922 ARG_VERSION = 0x100,
2923 ARG_CAT_CONFIG,
2924 ARG_USER,
2925 ARG_CREATE,
2926 ARG_CLEAN,
2927 ARG_REMOVE,
2928 ARG_BOOT,
2929 ARG_PREFIX,
2930 ARG_EXCLUDE_PREFIX,
2931 ARG_ROOT,
2932 ARG_REPLACE,
2933 ARG_NO_PAGER,
2934 };
2935
2936 static const struct option options[] = {
2937 { "help", no_argument, NULL, 'h' },
2938 { "user", no_argument, NULL, ARG_USER },
2939 { "version", no_argument, NULL, ARG_VERSION },
2940 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
2941 { "create", no_argument, NULL, ARG_CREATE },
2942 { "clean", no_argument, NULL, ARG_CLEAN },
2943 { "remove", no_argument, NULL, ARG_REMOVE },
2944 { "boot", no_argument, NULL, ARG_BOOT },
2945 { "prefix", required_argument, NULL, ARG_PREFIX },
2946 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
2947 { "root", required_argument, NULL, ARG_ROOT },
2948 { "replace", required_argument, NULL, ARG_REPLACE },
2949 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
2950 {}
2951 };
2952
2953 int c, r;
2954
2955 assert(argc >= 0);
2956 assert(argv);
2957
2958 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
2959
2960 switch (c) {
2961
2962 case 'h':
2963 return help();
2964
2965 case ARG_VERSION:
2966 return version();
2967
2968 case ARG_CAT_CONFIG:
2969 arg_cat_config = true;
2970 break;
2971
2972 case ARG_USER:
2973 arg_user = true;
2974 break;
2975
2976 case ARG_CREATE:
2977 arg_operation |= OPERATION_CREATE;
2978 break;
2979
2980 case ARG_CLEAN:
2981 arg_operation |= OPERATION_CLEAN;
2982 break;
2983
2984 case ARG_REMOVE:
2985 arg_operation |= OPERATION_REMOVE;
2986 break;
2987
2988 case ARG_BOOT:
2989 arg_boot = true;
2990 break;
2991
2992 case ARG_PREFIX:
2993 if (strv_push(&arg_include_prefixes, optarg) < 0)
2994 return log_oom();
2995 break;
2996
2997 case ARG_EXCLUDE_PREFIX:
2998 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
2999 return log_oom();
3000 break;
3001
3002 case ARG_ROOT:
3003 r = parse_path_argument_and_warn(optarg, /* suppress_root= */ false, &arg_root);
3004 if (r < 0)
3005 return r;
3006 break;
3007
3008 case ARG_REPLACE:
3009 if (!path_is_absolute(optarg) ||
3010 !endswith(optarg, ".conf"))
3011 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3012 "The argument to --replace= must an absolute path to a config file");
3013
3014 arg_replace = optarg;
3015 break;
3016
3017 case ARG_NO_PAGER:
3018 arg_pager_flags |= PAGER_DISABLE;
3019 break;
3020
3021 case '?':
3022 return -EINVAL;
3023
3024 default:
3025 assert_not_reached("Unhandled option");
3026 }
3027
3028 if (arg_operation == 0 && !arg_cat_config)
3029 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3030 "You need to specify at least one of --clean, --create or --remove.");
3031
3032 if (arg_replace && arg_cat_config)
3033 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3034 "Option --replace= is not supported with --cat-config");
3035
3036 if (arg_replace && optind >= argc)
3037 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3038 "When --replace= is given, some configuration items must be specified");
3039
3040 return 1;
3041 }
3042
3043 static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) {
3044 _cleanup_(hashmap_freep) Hashmap *uid_cache = NULL, *gid_cache = NULL;
3045 _cleanup_fclose_ FILE *_f = NULL;
3046 Iterator iterator;
3047 unsigned v = 0;
3048 FILE *f;
3049 Item *i;
3050 int r = 0;
3051
3052 assert(fn);
3053
3054 if (streq(fn, "-")) {
3055 log_debug("Reading config from stdin…");
3056 fn = "<stdin>";
3057 f = stdin;
3058 } else {
3059 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f);
3060 if (r < 0) {
3061 if (ignore_enoent && r == -ENOENT) {
3062 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
3063 return 0;
3064 }
3065
3066 return log_error_errno(r, "Failed to open '%s': %m", fn);
3067 }
3068 log_debug("Reading config file \"%s\"…", fn);
3069 f = _f;
3070 }
3071
3072 for (;;) {
3073 _cleanup_free_ char *line = NULL;
3074 bool invalid_line = false;
3075 char *l;
3076 int k;
3077
3078 k = read_line(f, LONG_LINE_MAX, &line);
3079 if (k < 0)
3080 return log_error_errno(k, "Failed to read '%s': %m", fn);
3081 if (k == 0)
3082 break;
3083
3084 v++;
3085
3086 l = strstrip(line);
3087 if (IN_SET(*l, 0, '#'))
3088 continue;
3089
3090 k = parse_line(fn, v, l, &invalid_line, &uid_cache, &gid_cache);
3091 if (k < 0) {
3092 if (invalid_line)
3093 /* Allow reporting with a special code if the caller requested this */
3094 *invalid_config = true;
3095 else if (r == 0)
3096 /* The first error becomes our return value */
3097 r = k;
3098 }
3099 }
3100
3101 /* we have to determine age parameter for each entry of type X */
3102 ORDERED_HASHMAP_FOREACH(i, globs, iterator) {
3103 Iterator iter;
3104 Item *j, *candidate_item = NULL;
3105
3106 if (i->type != IGNORE_DIRECTORY_PATH)
3107 continue;
3108
3109 ORDERED_HASHMAP_FOREACH(j, items, iter) {
3110 if (!IN_SET(j->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA))
3111 continue;
3112
3113 if (path_equal(j->path, i->path)) {
3114 candidate_item = j;
3115 break;
3116 }
3117
3118 if ((!candidate_item && path_startswith(i->path, j->path)) ||
3119 (candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)))
3120 candidate_item = j;
3121 }
3122
3123 if (candidate_item && candidate_item->age_set) {
3124 i->age = candidate_item->age;
3125 i->age_set = true;
3126 }
3127 }
3128
3129 if (ferror(f)) {
3130 log_error_errno(errno, "Failed to read from file %s: %m", fn);
3131 if (r == 0)
3132 r = -EIO;
3133 }
3134
3135 return r;
3136 }
3137
3138 static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
3139 char **arg;
3140 int r;
3141
3142 STRV_FOREACH(arg, args) {
3143 r = read_config_file(config_dirs, *arg, false, invalid_config);
3144 if (r < 0)
3145 return r;
3146 }
3147
3148 return 0;
3149 }
3150
3151 static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
3152 _cleanup_strv_free_ char **files = NULL;
3153 _cleanup_free_ char *p = NULL;
3154 char **f;
3155 int r;
3156
3157 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
3158 if (r < 0)
3159 return r;
3160
3161 STRV_FOREACH(f, files)
3162 if (p && path_equal(*f, p)) {
3163 log_debug("Parsing arguments at position \"%s\"…", *f);
3164
3165 r = parse_arguments(config_dirs, args, invalid_config);
3166 if (r < 0)
3167 return r;
3168 } else
3169 /* Just warn, ignore result otherwise.
3170 * read_config_file() has some debug output, so no need to print anything. */
3171 (void) read_config_file(config_dirs, *f, true, invalid_config);
3172
3173 return 0;
3174 }
3175
3176 static int link_parent(ItemArray *a) {
3177 const char *path;
3178 char *prefix;
3179 int r;
3180
3181 assert(a);
3182
3183 /* Finds the closest "parent" item array for the specified item array. Then registers the specified item array
3184 * as child of it, and fills the parent in, linking them both ways. This allows us to later create parents
3185 * before their children, and clean up/remove children before their parents. */
3186
3187 if (a->n_items <= 0)
3188 return 0;
3189
3190 path = a->items[0].path;
3191 prefix = newa(char, strlen(path) + 1);
3192 PATH_FOREACH_PREFIX(prefix, path) {
3193 ItemArray *j;
3194
3195 j = ordered_hashmap_get(items, prefix);
3196 if (!j)
3197 j = ordered_hashmap_get(globs, prefix);
3198 if (j) {
3199 r = set_ensure_allocated(&j->children, NULL);
3200 if (r < 0)
3201 return log_oom();
3202
3203 r = set_put(j->children, a);
3204 if (r < 0)
3205 return log_oom();
3206
3207 a->parent = j;
3208 return 1;
3209 }
3210 }
3211
3212 return 0;
3213 }
3214
3215 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
3216 ItemArray, item_array_free);
3217
3218 static int run(int argc, char *argv[]) {
3219 _cleanup_strv_free_ char **config_dirs = NULL;
3220 bool invalid_config = false;
3221 Iterator iterator;
3222 ItemArray *a;
3223 enum {
3224 PHASE_REMOVE_AND_CLEAN,
3225 PHASE_CREATE,
3226 _PHASE_MAX
3227 } phase;
3228 int r, k;
3229
3230 r = parse_argv(argc, argv);
3231 if (r <= 0)
3232 return r;
3233
3234 log_setup_service();
3235
3236 /* Descending down file system trees might take a lot of fds */
3237 (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
3238
3239 if (arg_user) {
3240 r = user_config_paths(&config_dirs);
3241 if (r < 0)
3242 return log_error_errno(r, "Failed to initialize configuration directory list: %m");
3243 } else {
3244 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
3245 if (!config_dirs)
3246 return log_oom();
3247 }
3248
3249 if (DEBUG_LOGGING) {
3250 _cleanup_free_ char *t = NULL;
3251
3252 t = strv_join(config_dirs, "\n\t");
3253 if (t)
3254 log_debug("Looking for configuration files in (higher priority first):\n\t%s", t);
3255 }
3256
3257 if (arg_cat_config) {
3258 (void) pager_open(arg_pager_flags);
3259
3260 return cat_config(config_dirs, argv + optind);
3261 }
3262
3263 umask(0022);
3264
3265 mac_selinux_init();
3266
3267 items = ordered_hashmap_new(&item_array_hash_ops);
3268 globs = ordered_hashmap_new(&item_array_hash_ops);
3269 if (!items || !globs)
3270 return log_oom();
3271
3272 /* If command line arguments are specified along with --replace, read all
3273 * configuration files and insert the positional arguments at the specified
3274 * place. Otherwise, if command line arguments are specified, execute just
3275 * them, and finally, without --replace= or any positional arguments, just
3276 * read configuration and execute it.
3277 */
3278 if (arg_replace || optind >= argc)
3279 r = read_config_files(config_dirs, argv + optind, &invalid_config);
3280 else
3281 r = parse_arguments(config_dirs, argv + optind, &invalid_config);
3282 if (r < 0)
3283 return r;
3284
3285 /* Let's now link up all child/parent relationships */
3286 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3287 r = link_parent(a);
3288 if (r < 0)
3289 return r;
3290 }
3291 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3292 r = link_parent(a);
3293 if (r < 0)
3294 return r;
3295 }
3296
3297 /* If multiple operations are requested, let's first run the remove/clean operations, and only then the create
3298 * operations. i.e. that we first clean out the platform we then build on. */
3299 for (phase = 0; phase < _PHASE_MAX; phase++) {
3300 OperationMask op;
3301
3302 if (phase == PHASE_REMOVE_AND_CLEAN)
3303 op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
3304 else if (phase == PHASE_CREATE)
3305 op = arg_operation & OPERATION_CREATE;
3306 else
3307 assert_not_reached("unexpected phase");
3308
3309 if (op == 0) /* Nothing requested in this phase */
3310 continue;
3311
3312 /* The non-globbing ones usually create things, hence we apply them first */
3313 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3314 k = process_item_array(a, op);
3315 if (k < 0 && r >= 0)
3316 r = k;
3317 }
3318
3319 /* The globbing ones usually alter things, hence we apply them second. */
3320 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3321 k = process_item_array(a, op);
3322 if (k < 0 && r >= 0)
3323 r = k;
3324 }
3325 }
3326
3327 if (ERRNO_IS_RESOURCE(-r))
3328 return r;
3329 if (invalid_config)
3330 return EX_DATAERR;
3331 if (r < 0)
3332 return EX_CANTCREAT;
3333 return 0;
3334 }
3335
3336 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
Unnamed repository; edit this file 'description' to name the repository.