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Merge pull request #15626 from poettering/more-specifiers
[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 "pager.h"
43 #include "parse-util.h"
44 #include "path-lookup.h"
45 #include "path-util.h"
46 #include "pretty-print.h"
47 #include "rlimit-util.h"
48 #include "rm-rf.h"
49 #include "selinux-util.h"
50 #include "set.h"
51 #include "sort-util.h"
52 #include "specifier.h"
53 #include "stat-util.h"
54 #include "stdio-util.h"
55 #include "string-table.h"
56 #include "string-util.h"
57 #include "strv.h"
58 #include "umask-util.h"
59 #include "user-util.h"
60
61 /* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
62 * them in the file system. This is intended to be used to create
63 * properly owned directories beneath /tmp, /var/tmp, /run, which are
64 * volatile and hence need to be recreated on bootup. */
65
66 typedef enum OperationMask {
67 OPERATION_CREATE = 1 << 0,
68 OPERATION_REMOVE = 1 << 1,
69 OPERATION_CLEAN = 1 << 2,
70 } OperationMask;
71
72 typedef enum ItemType {
73 /* These ones take file names */
74 CREATE_FILE = 'f',
75 TRUNCATE_FILE = 'F', /* deprecated: use f+ */
76 CREATE_DIRECTORY = 'd',
77 TRUNCATE_DIRECTORY = 'D',
78 CREATE_SUBVOLUME = 'v',
79 CREATE_SUBVOLUME_INHERIT_QUOTA = 'q',
80 CREATE_SUBVOLUME_NEW_QUOTA = 'Q',
81 CREATE_FIFO = 'p',
82 CREATE_SYMLINK = 'L',
83 CREATE_CHAR_DEVICE = 'c',
84 CREATE_BLOCK_DEVICE = 'b',
85 COPY_FILES = 'C',
86
87 /* These ones take globs */
88 WRITE_FILE = 'w',
89 EMPTY_DIRECTORY = 'e',
90 SET_XATTR = 't',
91 RECURSIVE_SET_XATTR = 'T',
92 SET_ACL = 'a',
93 RECURSIVE_SET_ACL = 'A',
94 SET_ATTRIBUTE = 'h',
95 RECURSIVE_SET_ATTRIBUTE = 'H',
96 IGNORE_PATH = 'x',
97 IGNORE_DIRECTORY_PATH = 'X',
98 REMOVE_PATH = 'r',
99 RECURSIVE_REMOVE_PATH = 'R',
100 RELABEL_PATH = 'z',
101 RECURSIVE_RELABEL_PATH = 'Z',
102 ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
103 } ItemType;
104
105 typedef struct Item {
106 ItemType type;
107
108 char *path;
109 char *argument;
110 char **xattrs;
111 #if HAVE_ACL
112 acl_t acl_access;
113 acl_t acl_default;
114 #endif
115 uid_t uid;
116 gid_t gid;
117 mode_t mode;
118 usec_t age;
119
120 dev_t major_minor;
121 unsigned attribute_value;
122 unsigned attribute_mask;
123
124 bool uid_set:1;
125 bool gid_set:1;
126 bool mode_set:1;
127 bool age_set:1;
128 bool mask_perms:1;
129 bool attribute_set:1;
130
131 bool keep_first_level:1;
132
133 bool append_or_force:1;
134
135 bool allow_failure:1;
136
137 OperationMask done;
138 } Item;
139
140 typedef struct ItemArray {
141 Item *items;
142 size_t n_items;
143 size_t allocated;
144
145 struct ItemArray *parent;
146 Set *children;
147 } ItemArray;
148
149 typedef enum DirectoryType {
150 DIRECTORY_RUNTIME,
151 DIRECTORY_STATE,
152 DIRECTORY_CACHE,
153 DIRECTORY_LOGS,
154 _DIRECTORY_TYPE_MAX,
155 } DirectoryType;
156
157 static bool arg_cat_config = false;
158 static bool arg_user = false;
159 static OperationMask arg_operation = 0;
160 static bool arg_boot = false;
161 static PagerFlags arg_pager_flags = 0;
162
163 static char **arg_include_prefixes = NULL;
164 static char **arg_exclude_prefixes = NULL;
165 static char *arg_root = NULL;
166 static char *arg_replace = NULL;
167
168 #define MAX_DEPTH 256
169
170 static OrderedHashmap *items = NULL, *globs = NULL;
171 static Set *unix_sockets = NULL;
172
173 STATIC_DESTRUCTOR_REGISTER(items, ordered_hashmap_freep);
174 STATIC_DESTRUCTOR_REGISTER(globs, ordered_hashmap_freep);
175 STATIC_DESTRUCTOR_REGISTER(unix_sockets, set_free_freep);
176 STATIC_DESTRUCTOR_REGISTER(arg_include_prefixes, freep);
177 STATIC_DESTRUCTOR_REGISTER(arg_exclude_prefixes, freep);
178 STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
179
180 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret);
181 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret);
182
183 static const Specifier specifier_table[] = {
184 { 'm', specifier_machine_id_safe, NULL },
185 { 'b', specifier_boot_id, NULL },
186 { 'H', specifier_host_name, NULL },
187 { 'v', specifier_kernel_release, NULL },
188 { 'a', specifier_architecture, NULL },
189 { 'o', specifier_os_id, NULL },
190 { 'w', specifier_os_version_id, NULL },
191 { 'B', specifier_os_build_id, NULL },
192 { 'W', specifier_os_variant_id, NULL },
193
194 { 'g', specifier_group_name, NULL },
195 { 'G', specifier_group_id, NULL },
196 { 'U', specifier_user_id, NULL },
197 { 'u', specifier_user_name, NULL },
198 { 'h', specifier_user_home, NULL },
199
200 { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
201 { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
202 { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
203 { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
204 { 'T', specifier_tmp_dir, NULL },
205 { 'V', specifier_var_tmp_dir, NULL },
206 {}
207 };
208
209 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret) {
210 int r;
211
212 /* If /etc/machine_id is missing or empty (e.g. in a chroot environment)
213 * return a recognizable error so that the caller can skip the rule
214 * gracefully. */
215
216 r = specifier_machine_id(specifier, data, userdata, ret);
217 if (IN_SET(r, -ENOENT, -ENOMEDIUM))
218 return -ENXIO;
219
220 return r;
221 }
222
223 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret) {
224 struct table_entry {
225 uint64_t type;
226 const char *suffix;
227 };
228
229 static const struct table_entry paths_system[] = {
230 [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
231 [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
232 [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
233 [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
234 };
235
236 static const struct table_entry paths_user[] = {
237 [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
238 [DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION },
239 [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
240 [DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
241 };
242
243 unsigned i;
244 const struct table_entry *paths;
245
246 assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
247 paths = arg_user ? paths_user : paths_system;
248
249 i = PTR_TO_UINT(data);
250 assert(i < ELEMENTSOF(paths_system));
251
252 return sd_path_lookup(paths[i].type, paths[i].suffix, ret);
253 }
254
255 static int log_unresolvable_specifier(const char *filename, unsigned line) {
256 static bool notified = false;
257
258 /* In system mode, this is called when /etc is not fully initialized (e.g.
259 * in a chroot environment) where some specifiers are unresolvable. In user
260 * mode, this is called when some variables are not defined. These cases are
261 * not considered as an error so log at LOG_NOTICE only for the first time
262 * and then downgrade this to LOG_DEBUG for the rest. */
263
264 log_syntax(NULL,
265 notified ? LOG_DEBUG : LOG_NOTICE,
266 filename, line, 0,
267 "Failed to resolve specifier: %s, skipping",
268 arg_user ? "Required $XDG_... variable not defined" : "uninitialized /etc detected");
269
270 if (!notified)
271 log_notice("All rules containing unresolvable specifiers will be skipped.");
272
273 notified = true;
274 return 0;
275 }
276
277 static int user_config_paths(char*** ret) {
278 _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
279 _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
280 _cleanup_strv_free_ char **res = NULL;
281 int r;
282
283 r = xdg_user_dirs(&config_dirs, &data_dirs);
284 if (r < 0)
285 return r;
286
287 r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
288 if (r < 0 && r != -ENXIO)
289 return r;
290
291 r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
292 if (r < 0 && r != -ENXIO)
293 return r;
294
295 r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
296 if (r < 0 && r != -ENXIO)
297 return r;
298
299 r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
300 if (r < 0)
301 return r;
302
303 r = strv_extend(&res, persistent_config);
304 if (r < 0)
305 return r;
306
307 r = strv_extend(&res, runtime_config);
308 if (r < 0)
309 return r;
310
311 r = strv_extend(&res, data_home);
312 if (r < 0)
313 return r;
314
315 r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
316 if (r < 0)
317 return r;
318
319 r = path_strv_make_absolute_cwd(res);
320 if (r < 0)
321 return r;
322
323 *ret = TAKE_PTR(res);
324 return 0;
325 }
326
327 static bool needs_glob(ItemType t) {
328 return IN_SET(t,
329 WRITE_FILE,
330 IGNORE_PATH,
331 IGNORE_DIRECTORY_PATH,
332 REMOVE_PATH,
333 RECURSIVE_REMOVE_PATH,
334 EMPTY_DIRECTORY,
335 ADJUST_MODE,
336 RELABEL_PATH,
337 RECURSIVE_RELABEL_PATH,
338 SET_XATTR,
339 RECURSIVE_SET_XATTR,
340 SET_ACL,
341 RECURSIVE_SET_ACL,
342 SET_ATTRIBUTE,
343 RECURSIVE_SET_ATTRIBUTE);
344 }
345
346 static bool takes_ownership(ItemType t) {
347 return IN_SET(t,
348 CREATE_FILE,
349 TRUNCATE_FILE,
350 CREATE_DIRECTORY,
351 EMPTY_DIRECTORY,
352 TRUNCATE_DIRECTORY,
353 CREATE_SUBVOLUME,
354 CREATE_SUBVOLUME_INHERIT_QUOTA,
355 CREATE_SUBVOLUME_NEW_QUOTA,
356 CREATE_FIFO,
357 CREATE_SYMLINK,
358 CREATE_CHAR_DEVICE,
359 CREATE_BLOCK_DEVICE,
360 COPY_FILES,
361 WRITE_FILE,
362 IGNORE_PATH,
363 IGNORE_DIRECTORY_PATH,
364 REMOVE_PATH,
365 RECURSIVE_REMOVE_PATH);
366 }
367
368 static struct Item* find_glob(OrderedHashmap *h, const char *match) {
369 ItemArray *j;
370 Iterator i;
371
372 ORDERED_HASHMAP_FOREACH(j, h, i) {
373 size_t n;
374
375 for (n = 0; n < j->n_items; n++) {
376 Item *item = j->items + n;
377
378 if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
379 return item;
380 }
381 }
382
383 return NULL;
384 }
385
386 static int load_unix_sockets(void) {
387 _cleanup_set_free_free_ Set *sockets = NULL;
388 _cleanup_fclose_ FILE *f = NULL;
389 int r;
390
391 if (unix_sockets)
392 return 0;
393
394 /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
395
396 sockets = set_new(&path_hash_ops);
397 if (!sockets)
398 return log_oom();
399
400 f = fopen("/proc/net/unix", "re");
401 if (!f)
402 return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
403 "Failed to open /proc/net/unix, ignoring: %m");
404
405 /* Skip header */
406 r = read_line(f, LONG_LINE_MAX, NULL);
407 if (r < 0)
408 return log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
409 if (r == 0)
410 return log_warning_errno(SYNTHETIC_ERRNO(EIO), "Premature end of file reading /proc/net/unix.");
411
412 for (;;) {
413 _cleanup_free_ char *line = NULL, *s = NULL;
414 char *p;
415
416 r = read_line(f, LONG_LINE_MAX, &line);
417 if (r < 0)
418 return log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
419 if (r == 0) /* EOF */
420 break;
421
422 p = strchr(line, ':');
423 if (!p)
424 continue;
425
426 if (strlen(p) < 37)
427 continue;
428
429 p += 37;
430 p += strspn(p, WHITESPACE);
431 p += strcspn(p, WHITESPACE); /* skip one more word */
432 p += strspn(p, WHITESPACE);
433
434 if (*p != '/')
435 continue;
436
437 s = strdup(p);
438 if (!s)
439 return log_oom();
440
441 path_simplify(s, false);
442
443 r = set_consume(sockets, s);
444 if (r == -EEXIST)
445 continue;
446 if (r < 0)
447 return log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
448
449 TAKE_PTR(s);
450 }
451
452 unix_sockets = TAKE_PTR(sockets);
453 return 1;
454 }
455
456 static bool unix_socket_alive(const char *fn) {
457 assert(fn);
458
459 if (load_unix_sockets() < 0)
460 return true; /* We don't know, so assume yes */
461
462 return !!set_get(unix_sockets, (char*) fn);
463 }
464
465 static DIR* xopendirat_nomod(int dirfd, const char *path) {
466 DIR *dir;
467
468 dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
469 if (dir)
470 return dir;
471
472 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
473 if (errno != EPERM)
474 return NULL;
475
476 dir = xopendirat(dirfd, path, O_NOFOLLOW);
477 if (!dir)
478 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
479
480 return dir;
481 }
482
483 static DIR* opendir_nomod(const char *path) {
484 return xopendirat_nomod(AT_FDCWD, path);
485 }
486
487 static int dir_cleanup(
488 Item *i,
489 const char *p,
490 DIR *d,
491 const struct stat *ds,
492 usec_t cutoff,
493 dev_t rootdev,
494 bool mountpoint,
495 int maxdepth,
496 bool keep_this_level) {
497
498 struct dirent *dent;
499 bool deleted = false;
500 int r = 0;
501
502 FOREACH_DIRENT_ALL(dent, d, break) {
503 struct stat s;
504 usec_t age;
505 _cleanup_free_ char *sub_path = NULL;
506
507 if (dot_or_dot_dot(dent->d_name))
508 continue;
509
510 if (fstatat(dirfd(d), dent->d_name, &s, AT_SYMLINK_NOFOLLOW) < 0) {
511 if (errno == ENOENT)
512 continue;
513
514 /* FUSE, NFS mounts, SELinux might return EACCES */
515 r = log_full_errno(errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
516 "stat(%s/%s) failed: %m", p, dent->d_name);
517 continue;
518 }
519
520 /* Stay on the same filesystem */
521 if (s.st_dev != rootdev) {
522 log_debug("Ignoring \"%s/%s\": different filesystem.", p, dent->d_name);
523 continue;
524 }
525
526 /* Try to detect bind mounts of the same filesystem instance; they
527 * do not differ in device major/minors. This type of query is not
528 * supported on all kernels or filesystem types though. */
529 if (S_ISDIR(s.st_mode)) {
530 int q;
531
532 q = fd_is_mount_point(dirfd(d), dent->d_name, 0);
533 if (q < 0)
534 log_debug_errno(q, "Failed to determine whether \"%s/%s\" is a mount point, ignoring: %m", p, dent->d_name);
535 else if (q > 0) {
536 log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.", p, dent->d_name);
537 continue;
538 }
539 }
540
541 sub_path = path_join(p, dent->d_name);
542 if (!sub_path) {
543 r = log_oom();
544 goto finish;
545 }
546
547 /* Is there an item configured for this path? */
548 if (ordered_hashmap_get(items, sub_path)) {
549 log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
550 continue;
551 }
552
553 if (find_glob(globs, sub_path)) {
554 log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
555 continue;
556 }
557
558 if (S_ISDIR(s.st_mode)) {
559 _cleanup_closedir_ DIR *sub_dir = NULL;
560
561 if (mountpoint &&
562 streq(dent->d_name, "lost+found") &&
563 s.st_uid == 0) {
564 log_debug("Ignoring directory \"%s\".", sub_path);
565 continue;
566 }
567
568 if (maxdepth <= 0)
569 log_warning("Reached max depth on \"%s\".", sub_path);
570 else {
571 int q;
572
573 sub_dir = xopendirat_nomod(dirfd(d), dent->d_name);
574 if (!sub_dir) {
575 if (errno != ENOENT)
576 r = log_warning_errno(errno, "Opening directory \"%s\" failed, ignoring: %m", sub_path);
577
578 continue;
579 }
580
581 if (flock(dirfd(sub_dir), LOCK_EX|LOCK_NB) < 0) {
582 log_debug_errno(errno, "Couldn't acquire shared BSD lock on directory \"%s\", skipping: %m", p);
583 continue;
584 }
585
586 q = dir_cleanup(i, sub_path, sub_dir, &s, cutoff, rootdev, false, maxdepth-1, false);
587 if (q < 0)
588 r = q;
589 }
590
591 /* Note: if you are wondering why we don't support the sticky bit for excluding
592 * directories from cleaning like we do it for other file system objects: well, the
593 * sticky bit already has a meaning for directories, so we don't want to overload
594 * that. */
595
596 if (keep_this_level) {
597 log_debug("Keeping directory \"%s\".", sub_path);
598 continue;
599 }
600
601 /* Ignore ctime, we change it when deleting */
602 age = timespec_load(&s.st_mtim);
603 if (age >= cutoff) {
604 char a[FORMAT_TIMESTAMP_MAX];
605 /* Follows spelling in stat(1). */
606 log_debug("Directory \"%s\": modify time %s is too new.",
607 sub_path,
608 format_timestamp_us(a, sizeof(a), age));
609 continue;
610 }
611
612 age = timespec_load(&s.st_atim);
613 if (age >= cutoff) {
614 char a[FORMAT_TIMESTAMP_MAX];
615 log_debug("Directory \"%s\": access time %s is too new.",
616 sub_path,
617 format_timestamp_us(a, sizeof(a), age));
618 continue;
619 }
620
621 log_debug("Removing directory \"%s\".", sub_path);
622 if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0)
623 if (!IN_SET(errno, ENOENT, ENOTEMPTY))
624 r = log_warning_errno(errno, "Failed to remove directory \"%s\", ignoring: %m", sub_path);
625
626 } else {
627 /* Skip files for which the sticky bit is set. These are semantics we define, and are
628 * unknown elsewhere. See XDG_RUNTIME_DIR specification for details. */
629 if (s.st_mode & S_ISVTX) {
630 log_debug("Skipping \"%s\": sticky bit set.", sub_path);
631 continue;
632 }
633
634 if (mountpoint &&
635 S_ISREG(s.st_mode) &&
636 s.st_uid == 0 &&
637 STR_IN_SET(dent->d_name,
638 ".journal",
639 "aquota.user",
640 "aquota.group")) {
641 log_debug("Skipping \"%s\".", sub_path);
642 continue;
643 }
644
645 /* Ignore sockets that are listed in /proc/net/unix */
646 if (S_ISSOCK(s.st_mode) && unix_socket_alive(sub_path)) {
647 log_debug("Skipping \"%s\": live socket.", sub_path);
648 continue;
649 }
650
651 /* Ignore device nodes */
652 if (S_ISCHR(s.st_mode) || S_ISBLK(s.st_mode)) {
653 log_debug("Skipping \"%s\": a device.", sub_path);
654 continue;
655 }
656
657 /* Keep files on this level around if this is requested */
658 if (keep_this_level) {
659 log_debug("Keeping \"%s\".", sub_path);
660 continue;
661 }
662
663 age = timespec_load(&s.st_mtim);
664 if (age >= cutoff) {
665 char a[FORMAT_TIMESTAMP_MAX];
666 /* Follows spelling in stat(1). */
667 log_debug("File \"%s\": modify time %s is too new.",
668 sub_path,
669 format_timestamp_us(a, sizeof(a), age));
670 continue;
671 }
672
673 age = timespec_load(&s.st_atim);
674 if (age >= cutoff) {
675 char a[FORMAT_TIMESTAMP_MAX];
676 log_debug("File \"%s\": access time %s is too new.",
677 sub_path,
678 format_timestamp_us(a, sizeof(a), age));
679 continue;
680 }
681
682 age = timespec_load(&s.st_ctim);
683 if (age >= cutoff) {
684 char a[FORMAT_TIMESTAMP_MAX];
685 log_debug("File \"%s\": change time %s is too new.",
686 sub_path,
687 format_timestamp_us(a, sizeof(a), age));
688 continue;
689 }
690
691 log_debug("Removing \"%s\".", sub_path);
692 if (unlinkat(dirfd(d), dent->d_name, 0) < 0)
693 if (errno != ENOENT)
694 r = log_warning_errno(errno, "Failed to remove \"%s\", ignoring: %m", sub_path);
695
696 deleted = true;
697 }
698 }
699
700 finish:
701 if (deleted) {
702 char a[FORMAT_TIMESTAMP_MAX], b[FORMAT_TIMESTAMP_MAX];
703 usec_t age1, age2;
704
705 age1 = timespec_load(&ds->st_atim);
706 age2 = timespec_load(&ds->st_mtim);
707
708 log_debug("Restoring access and modification time on \"%s\": %s, %s",
709 p,
710 format_timestamp_us(a, sizeof(a), age1),
711 format_timestamp_us(b, sizeof(b), age2));
712
713 /* Restore original directory timestamps */
714 if (futimens(dirfd(d), (struct timespec[]) {
715 ds->st_atim,
716 ds->st_mtim }) < 0)
717 log_warning_errno(errno, "Failed to revert timestamps of '%s', ignoring: %m", p);
718 }
719
720 return r;
721 }
722
723 static bool dangerous_hardlinks(void) {
724 _cleanup_free_ char *value = NULL;
725 static int cached = -1;
726 int r;
727
728 /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
729 * what the upstream default is. */
730
731 if (cached >= 0)
732 return cached;
733
734 r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
735 if (r < 0) {
736 log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
737 return true;
738 }
739
740 r = parse_boolean(value);
741 if (r < 0) {
742 log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
743 return true;
744 }
745
746 cached = r == 0;
747 return cached;
748 }
749
750 static bool hardlink_vulnerable(const struct stat *st) {
751 assert(st);
752
753 return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
754 }
755
756 static mode_t process_mask_perms(mode_t mode, mode_t current) {
757
758 if ((current & 0111) == 0)
759 mode &= ~0111;
760 if ((current & 0222) == 0)
761 mode &= ~0222;
762 if ((current & 0444) == 0)
763 mode &= ~0444;
764 if (!S_ISDIR(current))
765 mode &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
766
767 return mode;
768 }
769
770 static int fd_set_perms(Item *i, int fd, const char *path, const struct stat *st) {
771 struct stat stbuf;
772 mode_t new_mode;
773 bool do_chown;
774
775 assert(i);
776 assert(fd);
777 assert(path);
778
779 if (!i->mode_set && !i->uid_set && !i->gid_set)
780 goto shortcut;
781
782 if (!st) {
783 if (fstat(fd, &stbuf) < 0)
784 return log_error_errno(errno, "fstat(%s) failed: %m", path);
785 st = &stbuf;
786 }
787
788 if (hardlink_vulnerable(st))
789 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
790 "Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
791 path);
792
793 /* Do we need a chown()? */
794 do_chown =
795 (i->uid_set && i->uid != st->st_uid) ||
796 (i->gid_set && i->gid != st->st_gid);
797
798 /* Calculate the mode to apply */
799 new_mode = i->mode_set ? (i->mask_perms ?
800 process_mask_perms(i->mode, st->st_mode) :
801 i->mode) :
802 (st->st_mode & 07777);
803
804 if (i->mode_set && do_chown) {
805 /* Before we issue the chmod() let's reduce the access mode to the common bits of the old and
806 * the new mode. That way there's no time window where the file exists under the old owner
807 * with more than the old access modes — and not under the new owner with more than the new
808 * access modes either. */
809
810 if (S_ISLNK(st->st_mode))
811 log_debug("Skipping temporary mode fix for symlink %s.", path);
812 else {
813 mode_t m = new_mode & st->st_mode; /* Mask new mode by old mode */
814
815 if (((m ^ st->st_mode) & 07777) == 0)
816 log_debug("\"%s\" matches temporary mode %o already.", path, m);
817 else {
818 log_debug("Temporarily changing \"%s\" to mode %o.", path, m);
819 if (fchmod_opath(fd, m) < 0)
820 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
821 }
822 }
823 }
824
825 if (do_chown) {
826 log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT,
827 path,
828 i->uid_set ? i->uid : UID_INVALID,
829 i->gid_set ? i->gid : GID_INVALID);
830
831 if (fchownat(fd,
832 "",
833 i->uid_set ? i->uid : UID_INVALID,
834 i->gid_set ? i->gid : GID_INVALID,
835 AT_EMPTY_PATH) < 0)
836 return log_error_errno(errno, "fchownat() of %s failed: %m", path);
837 }
838
839 /* Now, apply the final mode. We do this in two cases: when the user set a mode explicitly, or after a
840 * chown(), since chown()'s mangle the access mode in regards to sgid/suid in some conditions. */
841 if (i->mode_set || do_chown) {
842 if (S_ISLNK(st->st_mode))
843 log_debug("Skipping mode fix for symlink %s.", path);
844 else {
845 /* Check if the chmod() is unnecessary. Note that if we did a chown() before we always
846 * chmod() here again, since it might have mangled the bits. */
847 if (!do_chown && ((new_mode ^ st->st_mode) & 07777) == 0)
848 log_debug("\"%s\" matches mode %o already.", path, new_mode);
849 else {
850 log_debug("Changing \"%s\" to mode %o.", path, new_mode);
851 if (fchmod_opath(fd, new_mode) < 0)
852 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
853 }
854 }
855 }
856
857 shortcut:
858 return label_fix(path, 0);
859 }
860
861 static int path_open_parent_safe(const char *path) {
862 _cleanup_free_ char *dn = NULL;
863 int r, fd;
864
865 if (path_equal(path, "/") || !path_is_normalized(path))
866 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
867 "Failed to open parent of '%s': invalid path.",
868 path);
869
870 dn = dirname_malloc(path);
871 if (!dn)
872 return log_oom();
873
874 r = chase_symlinks(dn, arg_root, CHASE_SAFE|CHASE_WARN, NULL, &fd);
875 if (r < 0 && r != -ENOLINK)
876 return log_error_errno(r, "Failed to validate path %s: %m", path);
877
878 return r < 0 ? r : fd;
879 }
880
881 static int path_open_safe(const char *path) {
882 int r, fd;
883
884 /* path_open_safe() returns a file descriptor opened with O_PATH after
885 * verifying that the path doesn't contain unsafe transitions, except
886 * for its final component as the function does not follow symlink. */
887
888 assert(path);
889
890 if (!path_is_normalized(path))
891 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
892 "Failed to open invalid path '%s'.",
893 path);
894
895 r = chase_symlinks(path, arg_root, CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL, &fd);
896 if (r < 0 && r != -ENOLINK)
897 return log_error_errno(r, "Failed to validate path %s: %m", path);
898
899 return r < 0 ? r : fd;
900 }
901
902 static int path_set_perms(Item *i, const char *path) {
903 _cleanup_close_ int fd = -1;
904
905 assert(i);
906 assert(path);
907
908 fd = path_open_safe(path);
909 if (fd < 0)
910 return fd;
911
912 return fd_set_perms(i, fd, path, NULL);
913 }
914
915 static int parse_xattrs_from_arg(Item *i) {
916 const char *p;
917 int r;
918
919 assert(i);
920 assert(i->argument);
921
922 p = i->argument;
923
924 for (;;) {
925 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
926
927 r = extract_first_word(&p, &xattr, NULL, EXTRACT_UNQUOTE|EXTRACT_CUNESCAPE);
928 if (r < 0)
929 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
930 if (r <= 0)
931 break;
932
933 r = split_pair(xattr, "=", &name, &value);
934 if (r < 0) {
935 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
936 continue;
937 }
938
939 if (isempty(name) || isempty(value)) {
940 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
941 continue;
942 }
943
944 if (strv_push_pair(&i->xattrs, name, value) < 0)
945 return log_oom();
946
947 name = value = NULL;
948 }
949
950 return 0;
951 }
952
953 static int fd_set_xattrs(Item *i, int fd, const char *path, const struct stat *st) {
954 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
955 char **name, **value;
956
957 assert(i);
958 assert(fd);
959 assert(path);
960
961 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
962
963 STRV_FOREACH_PAIR(name, value, i->xattrs) {
964 log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
965 if (setxattr(procfs_path, *name, *value, strlen(*value), 0) < 0)
966 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
967 *name, *value, path);
968 }
969 return 0;
970 }
971
972 static int path_set_xattrs(Item *i, const char *path) {
973 _cleanup_close_ int fd = -1;
974
975 assert(i);
976 assert(path);
977
978 fd = path_open_safe(path);
979 if (fd < 0)
980 return fd;
981
982 return fd_set_xattrs(i, fd, path, NULL);
983 }
984
985 static int parse_acls_from_arg(Item *item) {
986 #if HAVE_ACL
987 int r;
988
989 assert(item);
990
991 /* If append_or_force (= modify) is set, we will not modify the acl
992 * afterwards, so the mask can be added now if necessary. */
993
994 r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->append_or_force);
995 if (r < 0)
996 log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
997 #else
998 log_warning_errno(SYNTHETIC_ERRNO(ENOSYS), "ACLs are not supported. Ignoring");
999 #endif
1000
1001 return 0;
1002 }
1003
1004 #if HAVE_ACL
1005 static int path_set_acl(const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) {
1006 _cleanup_(acl_free_charpp) char *t = NULL;
1007 _cleanup_(acl_freep) acl_t dup = NULL;
1008 int r;
1009
1010 /* Returns 0 for success, positive error if already warned,
1011 * negative error otherwise. */
1012
1013 if (modify) {
1014 r = acls_for_file(path, type, acl, &dup);
1015 if (r < 0)
1016 return r;
1017
1018 r = calc_acl_mask_if_needed(&dup);
1019 if (r < 0)
1020 return r;
1021 } else {
1022 dup = acl_dup(acl);
1023 if (!dup)
1024 return -errno;
1025
1026 /* the mask was already added earlier if needed */
1027 }
1028
1029 r = add_base_acls_if_needed(&dup, path);
1030 if (r < 0)
1031 return r;
1032
1033 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
1034 log_debug("Setting %s ACL %s on %s.",
1035 type == ACL_TYPE_ACCESS ? "access" : "default",
1036 strna(t), pretty);
1037
1038 r = acl_set_file(path, type, dup);
1039 if (r < 0)
1040 /* Return positive to indicate we already warned */
1041 return -log_error_errno(errno,
1042 "Setting %s ACL \"%s\" on %s failed: %m",
1043 type == ACL_TYPE_ACCESS ? "access" : "default",
1044 strna(t), pretty);
1045
1046 return 0;
1047 }
1048 #endif
1049
1050 static int fd_set_acls(Item *item, int fd, const char *path, const struct stat *st) {
1051 int r = 0;
1052 #if HAVE_ACL
1053 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1054 struct stat stbuf;
1055
1056 assert(item);
1057 assert(fd);
1058 assert(path);
1059
1060 if (!st) {
1061 if (fstat(fd, &stbuf) < 0)
1062 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1063 st = &stbuf;
1064 }
1065
1066 if (hardlink_vulnerable(st))
1067 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
1068 "Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
1069 path);
1070
1071 if (S_ISLNK(st->st_mode)) {
1072 log_debug("Skipping ACL fix for symlink %s.", path);
1073 return 0;
1074 }
1075
1076 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1077
1078 if (item->acl_access)
1079 r = path_set_acl(procfs_path, path, ACL_TYPE_ACCESS, item->acl_access, item->append_or_force);
1080
1081 /* set only default acls to folders */
1082 if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
1083 r = path_set_acl(procfs_path, path, ACL_TYPE_DEFAULT, item->acl_default, item->append_or_force);
1084
1085 if (r > 0)
1086 return -r; /* already warned */
1087
1088 /* The above procfs paths don't work if /proc is not mounted. */
1089 if (r == -ENOENT && proc_mounted() == 0)
1090 r = -ENOSYS;
1091
1092 if (r == -EOPNOTSUPP) {
1093 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1094 return 0;
1095 }
1096 if (r < 0)
1097 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1098 #endif
1099 return r;
1100 }
1101
1102 static int path_set_acls(Item *item, const char *path) {
1103 int r = 0;
1104 #if HAVE_ACL
1105 _cleanup_close_ int fd = -1;
1106
1107 assert(item);
1108 assert(path);
1109
1110 fd = path_open_safe(path);
1111 if (fd < 0)
1112 return fd;
1113
1114 r = fd_set_acls(item, fd, path, NULL);
1115 #endif
1116 return r;
1117 }
1118
1119 static int parse_attribute_from_arg(Item *item) {
1120
1121 static const struct {
1122 char character;
1123 unsigned value;
1124 } attributes[] = {
1125 { 'A', FS_NOATIME_FL }, /* do not update atime */
1126 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1127 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1128 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1129 { 'c', FS_COMPR_FL }, /* Compress file */
1130 { 'd', FS_NODUMP_FL }, /* do not dump file */
1131 { 'e', FS_EXTENT_FL }, /* Extents */
1132 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1133 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1134 { 's', FS_SECRM_FL }, /* Secure deletion */
1135 { 'u', FS_UNRM_FL }, /* Undelete */
1136 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1137 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1138 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1139 { 'P', FS_PROJINHERIT_FL }, /* Inherit the quota project ID */
1140 };
1141
1142 enum {
1143 MODE_ADD,
1144 MODE_DEL,
1145 MODE_SET
1146 } mode = MODE_ADD;
1147
1148 unsigned value = 0, mask = 0;
1149 const char *p;
1150
1151 assert(item);
1152
1153 p = item->argument;
1154 if (p) {
1155 if (*p == '+') {
1156 mode = MODE_ADD;
1157 p++;
1158 } else if (*p == '-') {
1159 mode = MODE_DEL;
1160 p++;
1161 } else if (*p == '=') {
1162 mode = MODE_SET;
1163 p++;
1164 }
1165 }
1166
1167 if (isempty(p) && mode != MODE_SET)
1168 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1169 "Setting file attribute on '%s' needs an attribute specification.",
1170 item->path);
1171
1172 for (; p && *p ; p++) {
1173 unsigned i, v;
1174
1175 for (i = 0; i < ELEMENTSOF(attributes); i++)
1176 if (*p == attributes[i].character)
1177 break;
1178
1179 if (i >= ELEMENTSOF(attributes))
1180 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1181 "Unknown file attribute '%c' on '%s'.",
1182 *p, item->path);
1183
1184 v = attributes[i].value;
1185
1186 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1187
1188 mask |= v;
1189 }
1190
1191 if (mode == MODE_SET)
1192 mask |= CHATTR_ALL_FL;
1193
1194 assert(mask != 0);
1195
1196 item->attribute_mask = mask;
1197 item->attribute_value = value;
1198 item->attribute_set = true;
1199
1200 return 0;
1201 }
1202
1203 static int fd_set_attribute(Item *item, int fd, const char *path, const struct stat *st) {
1204 _cleanup_close_ int procfs_fd = -1;
1205 struct stat stbuf;
1206 unsigned f;
1207 int r;
1208
1209 assert(item);
1210 assert(fd);
1211 assert(path);
1212
1213 if (!item->attribute_set || item->attribute_mask == 0)
1214 return 0;
1215
1216 if (!st) {
1217 if (fstat(fd, &stbuf) < 0)
1218 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1219 st = &stbuf;
1220 }
1221
1222 /* Issuing the file attribute ioctls on device nodes is not
1223 * safe, as that will be delivered to the drivers, not the
1224 * file system containing the device node. */
1225 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
1226 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1227 "Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
1228 path);
1229
1230 f = item->attribute_value & item->attribute_mask;
1231
1232 /* Mask away directory-specific flags */
1233 if (!S_ISDIR(st->st_mode))
1234 f &= ~FS_DIRSYNC_FL;
1235
1236 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1237 if (procfs_fd < 0)
1238 return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
1239
1240 r = chattr_fd(procfs_fd, f, item->attribute_mask, NULL);
1241 if (r < 0)
1242 log_full_errno(IN_SET(r, -ENOTTY, -EOPNOTSUPP) ? LOG_DEBUG : LOG_WARNING,
1243 r,
1244 "Cannot set file attribute for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1245 path, item->attribute_value, item->attribute_mask);
1246
1247 return 0;
1248 }
1249
1250 static int path_set_attribute(Item *item, const char *path) {
1251 _cleanup_close_ int fd = -1;
1252
1253 if (!item->attribute_set || item->attribute_mask == 0)
1254 return 0;
1255
1256 fd = path_open_safe(path);
1257 if (fd < 0)
1258 return fd;
1259
1260 return fd_set_attribute(item, fd, path, NULL);
1261 }
1262
1263 static int write_one_file(Item *i, const char *path) {
1264 _cleanup_close_ int fd = -1, dir_fd = -1;
1265 char *bn;
1266 int flags, r;
1267
1268 assert(i);
1269 assert(path);
1270 assert(i->argument);
1271 assert(i->type == WRITE_FILE);
1272
1273 /* Validate the path and keep the fd on the directory for opening the
1274 * file so we're sure that it can't be changed behind our back. */
1275 dir_fd = path_open_parent_safe(path);
1276 if (dir_fd < 0)
1277 return dir_fd;
1278
1279 bn = basename(path);
1280
1281 flags = O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY;
1282
1283 /* Follows symlinks */
1284 fd = openat(dir_fd, bn, i->append_or_force ? flags|O_APPEND : flags, i->mode);
1285 if (fd < 0) {
1286 if (errno == ENOENT) {
1287 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1288 return 0;
1289 }
1290 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1291 }
1292
1293 /* 'w' is allowed to write into any kind of files. */
1294 log_debug("Writing to \"%s\".", path);
1295
1296 r = loop_write(fd, i->argument, strlen(i->argument), false);
1297 if (r < 0)
1298 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1299
1300 return fd_set_perms(i, fd, path, NULL);
1301 }
1302
1303 static int create_file(Item *i, const char *path) {
1304 _cleanup_close_ int fd = -1, dir_fd = -1;
1305 struct stat stbuf, *st = NULL;
1306 int r = 0;
1307 char *bn;
1308
1309 assert(i);
1310 assert(path);
1311 assert(i->type == CREATE_FILE);
1312
1313 /* 'f' operates on regular files exclusively. */
1314
1315 /* Validate the path and keep the fd on the directory for opening the
1316 * file so we're sure that it can't be changed behind our back. */
1317 dir_fd = path_open_parent_safe(path);
1318 if (dir_fd < 0)
1319 return dir_fd;
1320
1321 bn = basename(path);
1322
1323 RUN_WITH_UMASK(0000) {
1324 mac_selinux_create_file_prepare(path, S_IFREG);
1325 fd = openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1326 mac_selinux_create_file_clear();
1327 }
1328
1329 if (fd < 0) {
1330 /* Even on a read-only filesystem, open(2) returns EEXIST if the
1331 * file already exists. It returns EROFS only if it needs to
1332 * create the file. */
1333 if (errno != EEXIST)
1334 return log_error_errno(errno, "Failed to create file %s: %m", path);
1335
1336 /* Re-open the file. At that point it must exist since open(2)
1337 * failed with EEXIST. We still need to check if the perms/mode
1338 * need to be changed. For read-only filesystems, we let
1339 * fd_set_perms() report the error if the perms need to be
1340 * modified. */
1341 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1342 if (fd < 0)
1343 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1344
1345 if (fstat(fd, &stbuf) < 0)
1346 return log_error_errno(errno, "stat(%s) failed: %m", path);
1347
1348 if (!S_ISREG(stbuf.st_mode)) {
1349 log_error("%s exists and is not a regular file.", path);
1350 return -EEXIST;
1351 }
1352
1353 st = &stbuf;
1354 } else {
1355
1356 log_debug("\"%s\" has been created.", path);
1357
1358 if (i->argument) {
1359 log_debug("Writing to \"%s\".", path);
1360
1361 r = loop_write(fd, i->argument, strlen(i->argument), false);
1362 if (r < 0)
1363 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1364 }
1365 }
1366
1367 return fd_set_perms(i, fd, path, st);
1368 }
1369
1370 static int truncate_file(Item *i, const char *path) {
1371 _cleanup_close_ int fd = -1, dir_fd = -1;
1372 struct stat stbuf, *st = NULL;
1373 bool erofs = false;
1374 int r = 0;
1375 char *bn;
1376
1377 assert(i);
1378 assert(path);
1379 assert(i->type == TRUNCATE_FILE || (i->type == CREATE_FILE && i->append_or_force));
1380
1381 /* We want to operate on regular file exclusively especially since
1382 * O_TRUNC is unspecified if the file is neither a regular file nor a
1383 * fifo nor a terminal device. Therefore we first open the file and make
1384 * sure it's a regular one before truncating it. */
1385
1386 /* Validate the path and keep the fd on the directory for opening the
1387 * file so we're sure that it can't be changed behind our back. */
1388 dir_fd = path_open_parent_safe(path);
1389 if (dir_fd < 0)
1390 return dir_fd;
1391
1392 bn = basename(path);
1393
1394 RUN_WITH_UMASK(0000) {
1395 mac_selinux_create_file_prepare(path, S_IFREG);
1396 fd = openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1397 mac_selinux_create_file_clear();
1398 }
1399
1400 if (fd < 0) {
1401 if (errno != EROFS)
1402 return log_error_errno(errno, "Failed to open/create file %s: %m", path);
1403
1404 /* On a read-only filesystem, we don't want to fail if the
1405 * target is already empty and the perms are set. So we still
1406 * proceed with the sanity checks and let the remaining
1407 * operations fail with EROFS if they try to modify the target
1408 * file. */
1409
1410 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1411 if (fd < 0) {
1412 if (errno == ENOENT) {
1413 log_error("Cannot create file %s on a read-only file system.", path);
1414 return -EROFS;
1415 }
1416
1417 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1418 }
1419
1420 erofs = true;
1421 }
1422
1423 if (fstat(fd, &stbuf) < 0)
1424 return log_error_errno(errno, "stat(%s) failed: %m", path);
1425
1426 if (!S_ISREG(stbuf.st_mode)) {
1427 log_error("%s exists and is not a regular file.", path);
1428 return -EEXIST;
1429 }
1430
1431 if (stbuf.st_size > 0) {
1432 if (ftruncate(fd, 0) < 0) {
1433 r = erofs ? -EROFS : -errno;
1434 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1435 }
1436 } else
1437 st = &stbuf;
1438
1439 log_debug("\"%s\" has been created.", path);
1440
1441 if (i->argument) {
1442 log_debug("Writing to \"%s\".", path);
1443
1444 r = loop_write(fd, i->argument, strlen(i->argument), false);
1445 if (r < 0) {
1446 r = erofs ? -EROFS : r;
1447 return log_error_errno(r, "Failed to write file %s: %m", path);
1448 }
1449 }
1450
1451 return fd_set_perms(i, fd, path, st);
1452 }
1453
1454 static int copy_files(Item *i) {
1455 _cleanup_close_ int dfd = -1, fd = -1;
1456 char *bn;
1457 int r;
1458
1459 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1460
1461 bn = basename(i->path);
1462
1463 /* Validate the path and use the returned directory fd for copying the
1464 * target so we're sure that the path can't be changed behind our
1465 * back. */
1466 dfd = path_open_parent_safe(i->path);
1467 if (dfd < 0)
1468 return dfd;
1469
1470 r = copy_tree_at(AT_FDCWD, i->argument,
1471 dfd, bn,
1472 i->uid_set ? i->uid : UID_INVALID,
1473 i->gid_set ? i->gid : GID_INVALID,
1474 COPY_REFLINK | COPY_MERGE_EMPTY | COPY_MAC_CREATE);
1475 if (r < 0) {
1476 struct stat a, b;
1477
1478 /* If the target already exists on read-only filesystems, trying
1479 * to create the target will not fail with EEXIST but with
1480 * EROFS. */
1481 if (r == -EROFS && faccessat(dfd, bn, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
1482 r = -EEXIST;
1483
1484 if (r != -EEXIST)
1485 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1486
1487 if (stat(i->argument, &a) < 0)
1488 return log_error_errno(errno, "stat(%s) failed: %m", i->argument);
1489
1490 if (fstatat(dfd, bn, &b, AT_SYMLINK_NOFOLLOW) < 0)
1491 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1492
1493 if ((a.st_mode ^ b.st_mode) & S_IFMT) {
1494 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1495 return 0;
1496 }
1497 }
1498
1499 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1500 if (fd < 0)
1501 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1502
1503 return fd_set_perms(i, fd, i->path, NULL);
1504 }
1505
1506 typedef enum {
1507 CREATION_NORMAL,
1508 CREATION_EXISTING,
1509 CREATION_FORCE,
1510 _CREATION_MODE_MAX,
1511 _CREATION_MODE_INVALID = -1
1512 } CreationMode;
1513
1514 static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = {
1515 [CREATION_NORMAL] = "Created",
1516 [CREATION_EXISTING] = "Found existing",
1517 [CREATION_FORCE] = "Created replacement",
1518 };
1519
1520 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
1521
1522 static int create_directory_or_subvolume(const char *path, mode_t mode, bool subvol, CreationMode *creation) {
1523 _cleanup_close_ int pfd = -1;
1524 CreationMode c;
1525 int r;
1526
1527 assert(path);
1528
1529 if (!creation)
1530 creation = &c;
1531
1532 pfd = path_open_parent_safe(path);
1533 if (pfd < 0)
1534 return pfd;
1535
1536 if (subvol) {
1537 if (btrfs_is_subvol(empty_to_root(arg_root)) <= 0)
1538
1539 /* Don't create a subvolume unless the root directory is
1540 * one, too. We do this under the assumption that if the
1541 * root directory is just a plain directory (i.e. very
1542 * light-weight), we shouldn't try to split it up into
1543 * subvolumes (i.e. more heavy-weight). Thus, chroot()
1544 * environments and suchlike will get a full brtfs
1545 * subvolume set up below their tree only if they
1546 * specifically set up a btrfs subvolume for the root
1547 * dir too. */
1548
1549 subvol = false;
1550 else {
1551 RUN_WITH_UMASK((~mode) & 0777)
1552 r = btrfs_subvol_make_fd(pfd, basename(path));
1553 }
1554 } else
1555 r = 0;
1556
1557 if (!subvol || r == -ENOTTY)
1558 RUN_WITH_UMASK(0000)
1559 r = mkdirat_label(pfd, basename(path), mode);
1560
1561 if (r < 0) {
1562 int k;
1563
1564 if (!IN_SET(r, -EEXIST, -EROFS))
1565 return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", path);
1566
1567 k = is_dir_fd(pfd);
1568 if (k == -ENOENT && r == -EROFS)
1569 return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", path);
1570 if (k < 0)
1571 return log_error_errno(k, "Failed to check if %s exists: %m", path);
1572 if (!k) {
1573 log_warning("\"%s\" already exists and is not a directory.", path);
1574 return -EEXIST;
1575 }
1576
1577 *creation = CREATION_EXISTING;
1578 } else
1579 *creation = CREATION_NORMAL;
1580
1581 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(*creation), path);
1582
1583 r = openat(pfd, basename(path), O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
1584 if (r < 0)
1585 return log_error_errno(errno, "Failed to open directory '%s': %m", basename(path));
1586
1587 return r;
1588 }
1589
1590 static int create_directory(Item *i, const char *path) {
1591 _cleanup_close_ int fd = -1;
1592
1593 assert(i);
1594 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
1595
1596 fd = create_directory_or_subvolume(path, i->mode, false, NULL);
1597 if (fd == -EEXIST)
1598 return 0;
1599 if (fd < 0)
1600 return fd;
1601
1602 return fd_set_perms(i, fd, path, NULL);
1603 }
1604
1605 static int create_subvolume(Item *i, const char *path) {
1606 _cleanup_close_ int fd = -1;
1607 CreationMode creation;
1608 int r, q = 0;
1609
1610 assert(i);
1611 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
1612
1613 fd = create_directory_or_subvolume(path, i->mode, true, &creation);
1614 if (fd == -EEXIST)
1615 return 0;
1616 if (fd < 0)
1617 return fd;
1618
1619 if (creation == CREATION_NORMAL &&
1620 IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
1621 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
1622 if (r == -ENOTTY)
1623 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
1624 else if (r == -EROFS)
1625 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
1626 else if (r == -ENOPROTOOPT)
1627 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
1628 else if (r < 0)
1629 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
1630 else if (r > 0)
1631 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
1632 else if (r == 0)
1633 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
1634 }
1635
1636 r = fd_set_perms(i, fd, path, NULL);
1637 if (q < 0) /* prefer the quota change error from above */
1638 return q;
1639
1640 return r;
1641 }
1642
1643 static int empty_directory(Item *i, const char *path) {
1644 int r;
1645
1646 assert(i);
1647 assert(i->type == EMPTY_DIRECTORY);
1648
1649 r = is_dir(path, false);
1650 if (r == -ENOENT) {
1651 /* Option "e" operates only on existing objects. Do not
1652 * print errors about non-existent files or directories */
1653 log_debug("Skipping missing directory: %s", path);
1654 return 0;
1655 }
1656 if (r < 0)
1657 return log_error_errno(r, "is_dir() failed on path %s: %m", path);
1658 if (r == 0)
1659 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1660 "'%s' already exists and is not a directory.",
1661 path);
1662
1663 return path_set_perms(i, path);
1664 }
1665
1666 static int create_device(Item *i, mode_t file_type) {
1667 _cleanup_close_ int dfd = -1, fd = -1;
1668 CreationMode creation;
1669 char *bn;
1670 int r;
1671
1672 assert(i);
1673 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
1674
1675 bn = basename(i->path);
1676
1677 /* Validate the path and use the returned directory fd for copying the
1678 * target so we're sure that the path can't be changed behind our
1679 * back. */
1680 dfd = path_open_parent_safe(i->path);
1681 if (dfd < 0)
1682 return dfd;
1683
1684 RUN_WITH_UMASK(0000) {
1685 mac_selinux_create_file_prepare(i->path, file_type);
1686 r = mknodat(dfd, bn, i->mode | file_type, i->major_minor);
1687 mac_selinux_create_file_clear();
1688 }
1689
1690 if (r < 0) {
1691 struct stat st;
1692
1693 if (errno == EPERM) {
1694 log_debug("We lack permissions, possibly because of cgroup configuration; "
1695 "skipping creation of device node %s.", i->path);
1696 return 0;
1697 }
1698
1699 if (errno != EEXIST)
1700 return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
1701
1702 if (fstatat(dfd, bn, &st, 0) < 0)
1703 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1704
1705 if ((st.st_mode & S_IFMT) != file_type) {
1706
1707 if (i->append_or_force) {
1708
1709 RUN_WITH_UMASK(0000) {
1710 mac_selinux_create_file_prepare(i->path, file_type);
1711 /* FIXME: need to introduce mknodat_atomic() */
1712 r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
1713 mac_selinux_create_file_clear();
1714 }
1715
1716 if (r < 0)
1717 return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
1718 creation = CREATION_FORCE;
1719 } else {
1720 log_debug("%s is not a device node.", i->path);
1721 return 0;
1722 }
1723 } else
1724 creation = CREATION_EXISTING;
1725 } else
1726 creation = CREATION_NORMAL;
1727
1728 log_debug("%s %s device node \"%s\" %u:%u.",
1729 creation_mode_verb_to_string(creation),
1730 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
1731 i->path, major(i->mode), minor(i->mode));
1732
1733 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1734 if (fd < 0)
1735 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1736
1737 return fd_set_perms(i, fd, i->path, NULL);
1738 }
1739
1740 static int create_fifo(Item *i, const char *path) {
1741 _cleanup_close_ int pfd = -1, fd = -1;
1742 CreationMode creation;
1743 struct stat st;
1744 char *bn;
1745 int r;
1746
1747 pfd = path_open_parent_safe(path);
1748 if (pfd < 0)
1749 return pfd;
1750
1751 bn = basename(path);
1752
1753 RUN_WITH_UMASK(0000) {
1754 mac_selinux_create_file_prepare(path, S_IFIFO);
1755 r = mkfifoat(pfd, bn, i->mode);
1756 mac_selinux_create_file_clear();
1757 }
1758
1759 if (r < 0) {
1760 if (errno != EEXIST)
1761 return log_error_errno(errno, "Failed to create fifo %s: %m", path);
1762
1763 if (fstatat(pfd, bn, &st, AT_SYMLINK_NOFOLLOW) < 0)
1764 return log_error_errno(errno, "stat(%s) failed: %m", path);
1765
1766 if (!S_ISFIFO(st.st_mode)) {
1767
1768 if (i->append_or_force) {
1769 RUN_WITH_UMASK(0000) {
1770 mac_selinux_create_file_prepare(path, S_IFIFO);
1771 r = mkfifoat_atomic(pfd, bn, i->mode);
1772 mac_selinux_create_file_clear();
1773 }
1774
1775 if (r < 0)
1776 return log_error_errno(r, "Failed to create fifo %s: %m", path);
1777 creation = CREATION_FORCE;
1778 } else {
1779 log_warning("\"%s\" already exists and is not a fifo.", path);
1780 return 0;
1781 }
1782 } else
1783 creation = CREATION_EXISTING;
1784 } else
1785 creation = CREATION_NORMAL;
1786
1787 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), path);
1788
1789 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1790 if (fd < 0)
1791 return log_error_errno(errno, "Failed to openat(%s): %m", path);
1792
1793 return fd_set_perms(i, fd, i->path, NULL);
1794 }
1795
1796 typedef int (*action_t)(Item *i, const char *path);
1797 typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st);
1798
1799 static int item_do(Item *i, int fd, const char *path, fdaction_t action) {
1800 struct stat st;
1801 int r = 0, q;
1802
1803 assert(i);
1804 assert(path);
1805 assert(fd >= 0);
1806
1807 if (fstat(fd, &st) < 0) {
1808 r = log_error_errno(errno, "fstat() on file failed: %m");
1809 goto finish;
1810 }
1811
1812 /* This returns the first error we run into, but nevertheless
1813 * tries to go on */
1814 r = action(i, fd, path, &st);
1815
1816 if (S_ISDIR(st.st_mode)) {
1817 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1818 _cleanup_closedir_ DIR *d = NULL;
1819 struct dirent *de;
1820
1821 /* The passed 'fd' was opened with O_PATH. We need to convert
1822 * it into a 'regular' fd before reading the directory content. */
1823 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1824
1825 d = opendir(procfs_path);
1826 if (!d) {
1827 log_error_errno(errno, "Failed to opendir() '%s': %m", procfs_path);
1828 if (r == 0)
1829 r = -errno;
1830 goto finish;
1831 }
1832
1833 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
1834 int de_fd;
1835
1836 if (dot_or_dot_dot(de->d_name))
1837 continue;
1838
1839 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1840 if (de_fd < 0)
1841 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
1842 else {
1843 _cleanup_free_ char *de_path = NULL;
1844
1845 de_path = path_join(path, de->d_name);
1846 if (!de_path)
1847 q = log_oom();
1848 else
1849 /* Pass ownership of dirent fd over */
1850 q = item_do(i, de_fd, de_path, action);
1851 }
1852
1853 if (q < 0 && r == 0)
1854 r = q;
1855 }
1856 }
1857 finish:
1858 safe_close(fd);
1859 return r;
1860 }
1861
1862 static int glob_item(Item *i, action_t action) {
1863 _cleanup_globfree_ glob_t g = {
1864 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1865 };
1866 int r = 0, k;
1867 char **fn;
1868
1869 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1870 if (k < 0 && k != -ENOENT)
1871 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1872
1873 STRV_FOREACH(fn, g.gl_pathv) {
1874 k = action(i, *fn);
1875 if (k < 0 && r == 0)
1876 r = k;
1877 }
1878
1879 return r;
1880 }
1881
1882 static int glob_item_recursively(Item *i, fdaction_t action) {
1883 _cleanup_globfree_ glob_t g = {
1884 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1885 };
1886 int r = 0, k;
1887 char **fn;
1888
1889 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1890 if (k < 0 && k != -ENOENT)
1891 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1892
1893 STRV_FOREACH(fn, g.gl_pathv) {
1894 _cleanup_close_ int fd = -1;
1895
1896 /* Make sure we won't trigger/follow file object (such as
1897 * device nodes, automounts, ...) pointed out by 'fn' with
1898 * O_PATH. Note, when O_PATH is used, flags other than
1899 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
1900
1901 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
1902 if (fd < 0) {
1903 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
1904 if (r == 0)
1905 r = -errno;
1906 continue;
1907 }
1908
1909 k = item_do(i, fd, *fn, action);
1910 if (k < 0 && r == 0)
1911 r = k;
1912
1913 /* we passed fd ownership to the previous call */
1914 fd = -1;
1915 }
1916
1917 return r;
1918 }
1919
1920 static int create_item(Item *i) {
1921 CreationMode creation;
1922 int r = 0;
1923
1924 assert(i);
1925
1926 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
1927
1928 switch (i->type) {
1929
1930 case IGNORE_PATH:
1931 case IGNORE_DIRECTORY_PATH:
1932 case REMOVE_PATH:
1933 case RECURSIVE_REMOVE_PATH:
1934 return 0;
1935
1936 case TRUNCATE_FILE:
1937 case CREATE_FILE:
1938 RUN_WITH_UMASK(0000)
1939 (void) mkdir_parents_label(i->path, 0755);
1940
1941 if ((i->type == CREATE_FILE && i->append_or_force) || i->type == TRUNCATE_FILE)
1942 r = truncate_file(i, i->path);
1943 else
1944 r = create_file(i, i->path);
1945
1946 if (r < 0)
1947 return r;
1948 break;
1949
1950 case COPY_FILES:
1951 RUN_WITH_UMASK(0000)
1952 (void) mkdir_parents_label(i->path, 0755);
1953
1954 r = copy_files(i);
1955 if (r < 0)
1956 return r;
1957 break;
1958
1959 case WRITE_FILE:
1960 r = glob_item(i, write_one_file);
1961 if (r < 0)
1962 return r;
1963
1964 break;
1965
1966 case CREATE_DIRECTORY:
1967 case TRUNCATE_DIRECTORY:
1968 RUN_WITH_UMASK(0000)
1969 (void) mkdir_parents_label(i->path, 0755);
1970
1971 r = create_directory(i, i->path);
1972 if (r < 0)
1973 return r;
1974 break;
1975
1976 case CREATE_SUBVOLUME:
1977 case CREATE_SUBVOLUME_INHERIT_QUOTA:
1978 case CREATE_SUBVOLUME_NEW_QUOTA:
1979 RUN_WITH_UMASK(0000)
1980 (void) mkdir_parents_label(i->path, 0755);
1981
1982 r = create_subvolume(i, i->path);
1983 if (r < 0)
1984 return r;
1985 break;
1986
1987 case EMPTY_DIRECTORY:
1988 r = glob_item(i, empty_directory);
1989 if (r < 0)
1990 return r;
1991 break;
1992
1993 case CREATE_FIFO:
1994 RUN_WITH_UMASK(0000)
1995 (void) mkdir_parents_label(i->path, 0755);
1996
1997 r = create_fifo(i, i->path);
1998 if (r < 0)
1999 return r;
2000 break;
2001
2002 case CREATE_SYMLINK: {
2003 RUN_WITH_UMASK(0000)
2004 (void) mkdir_parents_label(i->path, 0755);
2005
2006 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2007 r = symlink(i->argument, i->path);
2008 mac_selinux_create_file_clear();
2009
2010 if (r < 0) {
2011 _cleanup_free_ char *x = NULL;
2012
2013 if (errno != EEXIST)
2014 return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);
2015
2016 r = readlink_malloc(i->path, &x);
2017 if (r < 0 || !streq(i->argument, x)) {
2018
2019 if (i->append_or_force) {
2020 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2021 r = symlink_atomic(i->argument, i->path);
2022 mac_selinux_create_file_clear();
2023
2024 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2025 r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL);
2026 if (r < 0)
2027 return log_error_errno(r, "rm -fr %s failed: %m", i->path);
2028
2029 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2030 r = symlink(i->argument, i->path) < 0 ? -errno : 0;
2031 mac_selinux_create_file_clear();
2032 }
2033 if (r < 0)
2034 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2035
2036 creation = CREATION_FORCE;
2037 } else {
2038 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2039 return 0;
2040 }
2041 } else
2042 creation = CREATION_EXISTING;
2043 } else
2044
2045 creation = CREATION_NORMAL;
2046 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2047 break;
2048 }
2049
2050 case CREATE_BLOCK_DEVICE:
2051 case CREATE_CHAR_DEVICE:
2052 if (have_effective_cap(CAP_MKNOD) == 0) {
2053 /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
2054 * case to avoid noise, and we don't support virtualized devices in containers anyway. */
2055
2056 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2057 return 0;
2058 }
2059
2060 RUN_WITH_UMASK(0000)
2061 (void) mkdir_parents_label(i->path, 0755);
2062
2063 r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2064 if (r < 0)
2065 return r;
2066
2067 break;
2068
2069 case ADJUST_MODE:
2070 case RELABEL_PATH:
2071 r = glob_item(i, path_set_perms);
2072 if (r < 0)
2073 return r;
2074 break;
2075
2076 case RECURSIVE_RELABEL_PATH:
2077 r = glob_item_recursively(i, fd_set_perms);
2078 if (r < 0)
2079 return r;
2080 break;
2081
2082 case SET_XATTR:
2083 r = glob_item(i, path_set_xattrs);
2084 if (r < 0)
2085 return r;
2086 break;
2087
2088 case RECURSIVE_SET_XATTR:
2089 r = glob_item_recursively(i, fd_set_xattrs);
2090 if (r < 0)
2091 return r;
2092 break;
2093
2094 case SET_ACL:
2095 r = glob_item(i, path_set_acls);
2096 if (r < 0)
2097 return r;
2098 break;
2099
2100 case RECURSIVE_SET_ACL:
2101 r = glob_item_recursively(i, fd_set_acls);
2102 if (r < 0)
2103 return r;
2104 break;
2105
2106 case SET_ATTRIBUTE:
2107 r = glob_item(i, path_set_attribute);
2108 if (r < 0)
2109 return r;
2110 break;
2111
2112 case RECURSIVE_SET_ATTRIBUTE:
2113 r = glob_item_recursively(i, fd_set_attribute);
2114 if (r < 0)
2115 return r;
2116 break;
2117 }
2118
2119 return 0;
2120 }
2121
2122 static int remove_item_instance(Item *i, const char *instance) {
2123 int r;
2124
2125 assert(i);
2126
2127 switch (i->type) {
2128
2129 case REMOVE_PATH:
2130 if (remove(instance) < 0 && errno != ENOENT)
2131 return log_error_errno(errno, "rm(%s): %m", instance);
2132
2133 break;
2134
2135 case RECURSIVE_REMOVE_PATH:
2136 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2137 log_debug("rm -rf \"%s\"", instance);
2138 r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL);
2139 if (r < 0 && r != -ENOENT)
2140 return log_error_errno(r, "rm_rf(%s): %m", instance);
2141
2142 break;
2143
2144 default:
2145 assert_not_reached("wut?");
2146 }
2147
2148 return 0;
2149 }
2150
2151 static int remove_item(Item *i) {
2152 int r;
2153
2154 assert(i);
2155
2156 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
2157
2158 switch (i->type) {
2159
2160 case TRUNCATE_DIRECTORY:
2161 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2162 log_debug("rm -rf \"%s\"", i->path);
2163 r = rm_rf(i->path, REMOVE_PHYSICAL);
2164 if (r < 0 && r != -ENOENT)
2165 return log_error_errno(r, "rm_rf(%s): %m", i->path);
2166
2167 return 0;
2168
2169 case REMOVE_PATH:
2170 case RECURSIVE_REMOVE_PATH:
2171 return glob_item(i, remove_item_instance);
2172
2173 default:
2174 return 0;
2175 }
2176 }
2177
2178 static int clean_item_instance(Item *i, const char* instance) {
2179 _cleanup_closedir_ DIR *d = NULL;
2180 struct stat s, ps;
2181 bool mountpoint;
2182 usec_t cutoff, n;
2183 char timestamp[FORMAT_TIMESTAMP_MAX];
2184
2185 assert(i);
2186
2187 if (!i->age_set)
2188 return 0;
2189
2190 n = now(CLOCK_REALTIME);
2191 if (n < i->age)
2192 return 0;
2193
2194 cutoff = n - i->age;
2195
2196 d = opendir_nomod(instance);
2197 if (!d) {
2198 if (IN_SET(errno, ENOENT, ENOTDIR)) {
2199 log_debug_errno(errno, "Directory \"%s\": %m", instance);
2200 return 0;
2201 }
2202
2203 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
2204 }
2205
2206 if (fstat(dirfd(d), &s) < 0)
2207 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
2208
2209 if (!S_ISDIR(s.st_mode))
2210 return log_error_errno(SYNTHETIC_ERRNO(ENOTDIR),
2211 "%s is not a directory.", i->path);
2212
2213 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
2214 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
2215
2216 mountpoint = s.st_dev != ps.st_dev || s.st_ino == ps.st_ino;
2217
2218 log_debug("Cleanup threshold for %s \"%s\" is %s",
2219 mountpoint ? "mount point" : "directory",
2220 instance,
2221 format_timestamp_us(timestamp, sizeof(timestamp), cutoff));
2222
2223 return dir_cleanup(i, instance, d, &s, cutoff, s.st_dev, mountpoint,
2224 MAX_DEPTH, i->keep_first_level);
2225 }
2226
2227 static int clean_item(Item *i) {
2228 assert(i);
2229
2230 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
2231
2232 switch (i->type) {
2233 case CREATE_DIRECTORY:
2234 case CREATE_SUBVOLUME:
2235 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2236 case CREATE_SUBVOLUME_NEW_QUOTA:
2237 case TRUNCATE_DIRECTORY:
2238 case IGNORE_PATH:
2239 case COPY_FILES:
2240 clean_item_instance(i, i->path);
2241 return 0;
2242 case EMPTY_DIRECTORY:
2243 case IGNORE_DIRECTORY_PATH:
2244 return glob_item(i, clean_item_instance);
2245 default:
2246 return 0;
2247 }
2248 }
2249
2250 static int process_item(Item *i, OperationMask operation) {
2251 OperationMask todo;
2252 int r, q, p;
2253
2254 assert(i);
2255
2256 todo = operation & ~i->done;
2257 if (todo == 0) /* Everything already done? */
2258 return 0;
2259
2260 i->done |= operation;
2261
2262 r = chase_symlinks(i->path, arg_root, CHASE_NO_AUTOFS|CHASE_WARN, NULL, NULL);
2263 if (r == -EREMOTE) {
2264 log_notice_errno(r, "Skipping %s", i->path);
2265 return 0;
2266 }
2267 if (r < 0)
2268 log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
2269
2270 r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(i) : 0;
2271 /* Failure can only be tolerated for create */
2272 if (i->allow_failure)
2273 r = 0;
2274
2275 q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(i) : 0;
2276 p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(i) : 0;
2277
2278 return r < 0 ? r :
2279 q < 0 ? q :
2280 p;
2281 }
2282
2283 static int process_item_array(ItemArray *array, OperationMask operation) {
2284 int r = 0;
2285 size_t n;
2286
2287 assert(array);
2288
2289 /* Create any parent first. */
2290 if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
2291 r = process_item_array(array->parent, operation & OPERATION_CREATE);
2292
2293 /* Clean up all children first */
2294 if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) {
2295 Iterator i;
2296 ItemArray *c;
2297
2298 SET_FOREACH(c, array->children, i) {
2299 int k;
2300
2301 k = process_item_array(c, operation & (OPERATION_REMOVE|OPERATION_CLEAN));
2302 if (k < 0 && r == 0)
2303 r = k;
2304 }
2305 }
2306
2307 for (n = 0; n < array->n_items; n++) {
2308 int k;
2309
2310 k = process_item(array->items + n, operation);
2311 if (k < 0 && r == 0)
2312 r = k;
2313 }
2314
2315 return r;
2316 }
2317
2318 static void item_free_contents(Item *i) {
2319 assert(i);
2320 free(i->path);
2321 free(i->argument);
2322 strv_free(i->xattrs);
2323
2324 #if HAVE_ACL
2325 acl_free(i->acl_access);
2326 acl_free(i->acl_default);
2327 #endif
2328 }
2329
2330 static ItemArray* item_array_free(ItemArray *a) {
2331 size_t n;
2332
2333 if (!a)
2334 return NULL;
2335
2336 for (n = 0; n < a->n_items; n++)
2337 item_free_contents(a->items + n);
2338
2339 set_free(a->children);
2340 free(a->items);
2341 return mfree(a);
2342 }
2343
2344 static int item_compare(const Item *a, const Item *b) {
2345 /* Make sure that the ownership taking item is put first, so
2346 * that we first create the node, and then can adjust it */
2347
2348 if (takes_ownership(a->type) && !takes_ownership(b->type))
2349 return -1;
2350 if (!takes_ownership(a->type) && takes_ownership(b->type))
2351 return 1;
2352
2353 return CMP(a->type, b->type);
2354 }
2355
2356 static bool item_compatible(Item *a, Item *b) {
2357 assert(a);
2358 assert(b);
2359 assert(streq(a->path, b->path));
2360
2361 if (takes_ownership(a->type) && takes_ownership(b->type))
2362 /* check if the items are the same */
2363 return streq_ptr(a->argument, b->argument) &&
2364
2365 a->uid_set == b->uid_set &&
2366 a->uid == b->uid &&
2367
2368 a->gid_set == b->gid_set &&
2369 a->gid == b->gid &&
2370
2371 a->mode_set == b->mode_set &&
2372 a->mode == b->mode &&
2373
2374 a->age_set == b->age_set &&
2375 a->age == b->age &&
2376
2377 a->mask_perms == b->mask_perms &&
2378
2379 a->keep_first_level == b->keep_first_level &&
2380
2381 a->major_minor == b->major_minor;
2382
2383 return true;
2384 }
2385
2386 static bool should_include_path(const char *path) {
2387 char **prefix;
2388
2389 STRV_FOREACH(prefix, arg_exclude_prefixes)
2390 if (path_startswith(path, *prefix)) {
2391 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
2392 path, *prefix);
2393 return false;
2394 }
2395
2396 STRV_FOREACH(prefix, arg_include_prefixes)
2397 if (path_startswith(path, *prefix)) {
2398 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
2399 return true;
2400 }
2401
2402 /* no matches, so we should include this path only if we
2403 * have no whitelist at all */
2404 if (strv_isempty(arg_include_prefixes))
2405 return true;
2406
2407 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
2408 return false;
2409 }
2410
2411 static int specifier_expansion_from_arg(Item *i) {
2412 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
2413 char **xattr;
2414 int r;
2415
2416 assert(i);
2417
2418 if (!i->argument)
2419 return 0;
2420
2421 switch (i->type) {
2422 case COPY_FILES:
2423 case CREATE_SYMLINK:
2424 case CREATE_FILE:
2425 case TRUNCATE_FILE:
2426 case WRITE_FILE:
2427 r = cunescape(i->argument, 0, &unescaped);
2428 if (r < 0)
2429 return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument);
2430
2431 r = specifier_printf(unescaped, specifier_table, NULL, &resolved);
2432 if (r < 0)
2433 return r;
2434
2435 free_and_replace(i->argument, resolved);
2436 break;
2437
2438 case SET_XATTR:
2439 case RECURSIVE_SET_XATTR:
2440 STRV_FOREACH(xattr, i->xattrs) {
2441 r = specifier_printf(*xattr, specifier_table, NULL, &resolved);
2442 if (r < 0)
2443 return r;
2444
2445 free_and_replace(*xattr, resolved);
2446 }
2447 break;
2448
2449 default:
2450 break;
2451 }
2452 return 0;
2453 }
2454
2455 static int patch_var_run(const char *fname, unsigned line, char **path) {
2456 const char *k;
2457 char *n;
2458
2459 assert(path);
2460 assert(*path);
2461
2462 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
2463 * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
2464 * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
2465 * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
2466 * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
2467 * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
2468 * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
2469 * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
2470 * the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
2471
2472 k = path_startswith(*path, "/var/run/");
2473 if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
2474 return 0;
2475
2476 n = path_join("/run", k);
2477 if (!n)
2478 return log_oom();
2479
2480 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
2481 * there's no immediate need for action by the user. However, in the interest of making things less confusing
2482 * to the user, let's still inform the user that these snippets should really be updated. */
2483 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);
2484
2485 free_and_replace(*path, n);
2486
2487 return 0;
2488 }
2489
2490 static int parse_line(const char *fname, unsigned line, const char *buffer, bool *invalid_config) {
2491
2492 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
2493 _cleanup_(item_free_contents) Item i = {};
2494 ItemArray *existing;
2495 OrderedHashmap *h;
2496 int r, pos;
2497 bool append_or_force = false, boot = false, allow_failure = false;
2498
2499 assert(fname);
2500 assert(line >= 1);
2501 assert(buffer);
2502
2503 r = extract_many_words(
2504 &buffer,
2505 NULL,
2506 EXTRACT_UNQUOTE,
2507 &action,
2508 &path,
2509 &mode,
2510 &user,
2511 &group,
2512 &age,
2513 NULL);
2514 if (r < 0) {
2515 if (IN_SET(r, -EINVAL, -EBADSLT))
2516 /* invalid quoting and such or an unknown specifier */
2517 *invalid_config = true;
2518 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to parse line: %m");
2519 } else if (r < 2) {
2520 *invalid_config = true;
2521 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Syntax error.");
2522 }
2523
2524 if (!empty_or_dash(buffer)) {
2525 i.argument = strdup(buffer);
2526 if (!i.argument)
2527 return log_oom();
2528 }
2529
2530 if (isempty(action)) {
2531 *invalid_config = true;
2532 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Command too short '%s'.", action);
2533 }
2534
2535 for (pos = 1; action[pos]; pos++) {
2536 if (action[pos] == '!' && !boot)
2537 boot = true;
2538 else if (action[pos] == '+' && !append_or_force)
2539 append_or_force = true;
2540 else if (action[pos] == '-' && !allow_failure)
2541 allow_failure = true;
2542 else {
2543 *invalid_config = true;
2544 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Unknown modifiers in command '%s'", action);
2545 }
2546 }
2547
2548 if (boot && !arg_boot) {
2549 log_syntax(NULL, LOG_DEBUG, fname, line, 0, "Ignoring entry %s \"%s\" because --boot is not specified.", action, path);
2550 return 0;
2551 }
2552
2553 i.type = action[0];
2554 i.append_or_force = append_or_force;
2555 i.allow_failure = allow_failure;
2556
2557 r = specifier_printf(path, specifier_table, NULL, &i.path);
2558 if (r == -ENXIO)
2559 return log_unresolvable_specifier(fname, line);
2560 if (r < 0) {
2561 if (IN_SET(r, -EINVAL, -EBADSLT))
2562 *invalid_config = true;
2563 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to replace specifiers in '%s': %m", path);
2564 }
2565
2566 r = patch_var_run(fname, line, &i.path);
2567 if (r < 0)
2568 return r;
2569
2570 switch (i.type) {
2571
2572 case CREATE_DIRECTORY:
2573 case CREATE_SUBVOLUME:
2574 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2575 case CREATE_SUBVOLUME_NEW_QUOTA:
2576 case EMPTY_DIRECTORY:
2577 case TRUNCATE_DIRECTORY:
2578 case CREATE_FIFO:
2579 case IGNORE_PATH:
2580 case IGNORE_DIRECTORY_PATH:
2581 case REMOVE_PATH:
2582 case RECURSIVE_REMOVE_PATH:
2583 case ADJUST_MODE:
2584 case RELABEL_PATH:
2585 case RECURSIVE_RELABEL_PATH:
2586 if (i.argument)
2587 log_syntax(NULL, LOG_WARNING, fname, line, 0, "%c lines don't take argument fields, ignoring.", i.type);
2588
2589 break;
2590
2591 case CREATE_FILE:
2592 case TRUNCATE_FILE:
2593 break;
2594
2595 case CREATE_SYMLINK:
2596 if (!i.argument) {
2597 i.argument = path_join("/usr/share/factory", i.path);
2598 if (!i.argument)
2599 return log_oom();
2600 }
2601 break;
2602
2603 case WRITE_FILE:
2604 if (!i.argument) {
2605 *invalid_config = true;
2606 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Write file requires argument.");
2607 }
2608 break;
2609
2610 case COPY_FILES:
2611 if (!i.argument) {
2612 i.argument = path_join(arg_root, "/usr/share/factory", i.path);
2613 if (!i.argument)
2614 return log_oom();
2615
2616 } else if (!path_is_absolute(i.argument)) {
2617 *invalid_config = true;
2618 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Source path '%s' is not absolute.", i.argument);
2619
2620 } else if (arg_root) {
2621 char *p;
2622
2623 p = path_join(arg_root, i.argument);
2624 if (!p)
2625 return log_oom();
2626 free_and_replace(i.argument, p);
2627 }
2628
2629 path_simplify(i.argument, false);
2630 break;
2631
2632 case CREATE_CHAR_DEVICE:
2633 case CREATE_BLOCK_DEVICE:
2634 if (!i.argument) {
2635 *invalid_config = true;
2636 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Device file requires argument.");
2637 }
2638
2639 r = parse_dev(i.argument, &i.major_minor);
2640 if (r < 0) {
2641 *invalid_config = true;
2642 return log_syntax(NULL, LOG_ERR, fname, line, r, "Can't parse device file major/minor '%s'.", i.argument);
2643 }
2644
2645 break;
2646
2647 case SET_XATTR:
2648 case RECURSIVE_SET_XATTR:
2649 if (!i.argument) {
2650 *invalid_config = true;
2651 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2652 "Set extended attribute requires argument.");
2653 }
2654 r = parse_xattrs_from_arg(&i);
2655 if (r < 0)
2656 return r;
2657 break;
2658
2659 case SET_ACL:
2660 case RECURSIVE_SET_ACL:
2661 if (!i.argument) {
2662 *invalid_config = true;
2663 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2664 "Set ACLs requires argument.");
2665 }
2666 r = parse_acls_from_arg(&i);
2667 if (r < 0)
2668 return r;
2669 break;
2670
2671 case SET_ATTRIBUTE:
2672 case RECURSIVE_SET_ATTRIBUTE:
2673 if (!i.argument) {
2674 *invalid_config = true;
2675 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2676 "Set file attribute requires argument.");
2677 }
2678 r = parse_attribute_from_arg(&i);
2679 if (IN_SET(r, -EINVAL, -EBADSLT))
2680 *invalid_config = true;
2681 if (r < 0)
2682 return r;
2683 break;
2684
2685 default:
2686 *invalid_config = true;
2687 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2688 "Unknown command type '%c'.", (char) i.type);
2689 }
2690
2691 if (!path_is_absolute(i.path)) {
2692 *invalid_config = true;
2693 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2694 "Path '%s' not absolute.", i.path);
2695 }
2696
2697 path_simplify(i.path, false);
2698
2699 if (!should_include_path(i.path))
2700 return 0;
2701
2702 r = specifier_expansion_from_arg(&i);
2703 if (r == -ENXIO)
2704 return log_unresolvable_specifier(fname, line);
2705 if (r < 0) {
2706 if (IN_SET(r, -EINVAL, -EBADSLT))
2707 *invalid_config = true;
2708 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to substitute specifiers in argument: %m");
2709 }
2710
2711 if (arg_root) {
2712 char *p;
2713
2714 p = path_join(arg_root, i.path);
2715 if (!p)
2716 return log_oom();
2717 free_and_replace(i.path, p);
2718 }
2719
2720 if (!empty_or_dash(user)) {
2721 const char *u = user;
2722
2723 r = get_user_creds(&u, &i.uid, NULL, NULL, NULL, USER_CREDS_ALLOW_MISSING);
2724 if (r < 0) {
2725 *invalid_config = true;
2726 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve user '%s': %m", user);
2727 }
2728
2729 i.uid_set = true;
2730 }
2731
2732 if (!empty_or_dash(group)) {
2733 const char *g = group;
2734
2735 r = get_group_creds(&g, &i.gid, USER_CREDS_ALLOW_MISSING);
2736 if (r < 0) {
2737 *invalid_config = true;
2738 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve group '%s'.", group);
2739 }
2740
2741 i.gid_set = true;
2742 }
2743
2744 if (!empty_or_dash(mode)) {
2745 const char *mm = mode;
2746 unsigned m;
2747
2748 if (*mm == '~') {
2749 i.mask_perms = true;
2750 mm++;
2751 }
2752
2753 r = parse_mode(mm, &m);
2754 if (r < 0) {
2755 *invalid_config = true;
2756 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid mode '%s'.", mode);
2757 }
2758
2759 i.mode = m;
2760 i.mode_set = true;
2761 } else
2762 i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
2763
2764 if (!empty_or_dash(age)) {
2765 const char *a = age;
2766
2767 if (*a == '~') {
2768 i.keep_first_level = true;
2769 a++;
2770 }
2771
2772 r = parse_sec(a, &i.age);
2773 if (r < 0) {
2774 *invalid_config = true;
2775 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age '%s'.", age);
2776 }
2777
2778 i.age_set = true;
2779 }
2780
2781 h = needs_glob(i.type) ? globs : items;
2782
2783 existing = ordered_hashmap_get(h, i.path);
2784 if (existing) {
2785 size_t n;
2786
2787 for (n = 0; n < existing->n_items; n++) {
2788 if (!item_compatible(existing->items + n, &i) && !i.append_or_force) {
2789 log_syntax(NULL, LOG_NOTICE, fname, line, 0, "Duplicate line for path \"%s\", ignoring.", i.path);
2790 return 0;
2791 }
2792 }
2793 } else {
2794 existing = new0(ItemArray, 1);
2795 if (!existing)
2796 return log_oom();
2797
2798 r = ordered_hashmap_put(h, i.path, existing);
2799 if (r < 0) {
2800 free(existing);
2801 return log_oom();
2802 }
2803 }
2804
2805 if (!GREEDY_REALLOC(existing->items, existing->allocated, existing->n_items + 1))
2806 return log_oom();
2807
2808 existing->items[existing->n_items++] = i;
2809 i = (struct Item) {};
2810
2811 /* Sort item array, to enforce stable ordering of application */
2812 typesafe_qsort(existing->items, existing->n_items, item_compare);
2813
2814 return 0;
2815 }
2816
2817 static int cat_config(char **config_dirs, char **args) {
2818 _cleanup_strv_free_ char **files = NULL;
2819 int r;
2820
2821 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
2822 if (r < 0)
2823 return r;
2824
2825 return cat_files(NULL, files, 0);
2826 }
2827
2828 static int help(void) {
2829 _cleanup_free_ char *link = NULL;
2830 int r;
2831
2832 r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
2833 if (r < 0)
2834 return log_oom();
2835
2836 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
2837 "Creates, deletes and cleans up volatile and temporary files and directories.\n\n"
2838 " -h --help Show this help\n"
2839 " --user Execute user configuration\n"
2840 " --version Show package version\n"
2841 " --cat-config Show configuration files\n"
2842 " --create Create marked files/directories\n"
2843 " --clean Clean up marked directories\n"
2844 " --remove Remove marked files/directories\n"
2845 " --boot Execute actions only safe at boot\n"
2846 " --prefix=PATH Only apply rules with the specified prefix\n"
2847 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
2848 " --root=PATH Operate on an alternate filesystem root\n"
2849 " --replace=PATH Treat arguments as replacement for PATH\n"
2850 " --no-pager Do not pipe output into a pager\n"
2851 "\nSee the %s for details.\n"
2852 , program_invocation_short_name
2853 , link
2854 );
2855
2856 return 0;
2857 }
2858
2859 static int parse_argv(int argc, char *argv[]) {
2860
2861 enum {
2862 ARG_VERSION = 0x100,
2863 ARG_CAT_CONFIG,
2864 ARG_USER,
2865 ARG_CREATE,
2866 ARG_CLEAN,
2867 ARG_REMOVE,
2868 ARG_BOOT,
2869 ARG_PREFIX,
2870 ARG_EXCLUDE_PREFIX,
2871 ARG_ROOT,
2872 ARG_REPLACE,
2873 ARG_NO_PAGER,
2874 };
2875
2876 static const struct option options[] = {
2877 { "help", no_argument, NULL, 'h' },
2878 { "user", no_argument, NULL, ARG_USER },
2879 { "version", no_argument, NULL, ARG_VERSION },
2880 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
2881 { "create", no_argument, NULL, ARG_CREATE },
2882 { "clean", no_argument, NULL, ARG_CLEAN },
2883 { "remove", no_argument, NULL, ARG_REMOVE },
2884 { "boot", no_argument, NULL, ARG_BOOT },
2885 { "prefix", required_argument, NULL, ARG_PREFIX },
2886 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
2887 { "root", required_argument, NULL, ARG_ROOT },
2888 { "replace", required_argument, NULL, ARG_REPLACE },
2889 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
2890 {}
2891 };
2892
2893 int c, r;
2894
2895 assert(argc >= 0);
2896 assert(argv);
2897
2898 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
2899
2900 switch (c) {
2901
2902 case 'h':
2903 return help();
2904
2905 case ARG_VERSION:
2906 return version();
2907
2908 case ARG_CAT_CONFIG:
2909 arg_cat_config = true;
2910 break;
2911
2912 case ARG_USER:
2913 arg_user = true;
2914 break;
2915
2916 case ARG_CREATE:
2917 arg_operation |= OPERATION_CREATE;
2918 break;
2919
2920 case ARG_CLEAN:
2921 arg_operation |= OPERATION_CLEAN;
2922 break;
2923
2924 case ARG_REMOVE:
2925 arg_operation |= OPERATION_REMOVE;
2926 break;
2927
2928 case ARG_BOOT:
2929 arg_boot = true;
2930 break;
2931
2932 case ARG_PREFIX:
2933 if (strv_push(&arg_include_prefixes, optarg) < 0)
2934 return log_oom();
2935 break;
2936
2937 case ARG_EXCLUDE_PREFIX:
2938 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
2939 return log_oom();
2940 break;
2941
2942 case ARG_ROOT:
2943 r = parse_path_argument_and_warn(optarg, true, &arg_root);
2944 if (r < 0)
2945 return r;
2946 break;
2947
2948 case ARG_REPLACE:
2949 if (!path_is_absolute(optarg) ||
2950 !endswith(optarg, ".conf"))
2951 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2952 "The argument to --replace= must an absolute path to a config file");
2953
2954 arg_replace = optarg;
2955 break;
2956
2957 case ARG_NO_PAGER:
2958 arg_pager_flags |= PAGER_DISABLE;
2959 break;
2960
2961 case '?':
2962 return -EINVAL;
2963
2964 default:
2965 assert_not_reached("Unhandled option");
2966 }
2967
2968 if (arg_operation == 0 && !arg_cat_config)
2969 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2970 "You need to specify at least one of --clean, --create or --remove.");
2971
2972 if (arg_replace && arg_cat_config)
2973 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2974 "Option --replace= is not supported with --cat-config");
2975
2976 if (arg_replace && optind >= argc)
2977 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2978 "When --replace= is given, some configuration items must be specified");
2979
2980 return 1;
2981 }
2982
2983 static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) {
2984 _cleanup_fclose_ FILE *_f = NULL;
2985 Iterator iterator;
2986 unsigned v = 0;
2987 FILE *f;
2988 Item *i;
2989 int r = 0;
2990
2991 assert(fn);
2992
2993 if (streq(fn, "-")) {
2994 log_debug("Reading config from stdin…");
2995 fn = "<stdin>";
2996 f = stdin;
2997 } else {
2998 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f);
2999 if (r < 0) {
3000 if (ignore_enoent && r == -ENOENT) {
3001 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
3002 return 0;
3003 }
3004
3005 return log_error_errno(r, "Failed to open '%s': %m", fn);
3006 }
3007 log_debug("Reading config file \"%s\"…", fn);
3008 f = _f;
3009 }
3010
3011 for (;;) {
3012 _cleanup_free_ char *line = NULL;
3013 bool invalid_line = false;
3014 char *l;
3015 int k;
3016
3017 k = read_line(f, LONG_LINE_MAX, &line);
3018 if (k < 0)
3019 return log_error_errno(k, "Failed to read '%s': %m", fn);
3020 if (k == 0)
3021 break;
3022
3023 v++;
3024
3025 l = strstrip(line);
3026 if (IN_SET(*l, 0, '#'))
3027 continue;
3028
3029 k = parse_line(fn, v, l, &invalid_line);
3030 if (k < 0) {
3031 if (invalid_line)
3032 /* Allow reporting with a special code if the caller requested this */
3033 *invalid_config = true;
3034 else if (r == 0)
3035 /* The first error becomes our return value */
3036 r = k;
3037 }
3038 }
3039
3040 /* we have to determine age parameter for each entry of type X */
3041 ORDERED_HASHMAP_FOREACH(i, globs, iterator) {
3042 Iterator iter;
3043 Item *j, *candidate_item = NULL;
3044
3045 if (i->type != IGNORE_DIRECTORY_PATH)
3046 continue;
3047
3048 ORDERED_HASHMAP_FOREACH(j, items, iter) {
3049 if (!IN_SET(j->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA))
3050 continue;
3051
3052 if (path_equal(j->path, i->path)) {
3053 candidate_item = j;
3054 break;
3055 }
3056
3057 if ((!candidate_item && path_startswith(i->path, j->path)) ||
3058 (candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)))
3059 candidate_item = j;
3060 }
3061
3062 if (candidate_item && candidate_item->age_set) {
3063 i->age = candidate_item->age;
3064 i->age_set = true;
3065 }
3066 }
3067
3068 if (ferror(f)) {
3069 log_error_errno(errno, "Failed to read from file %s: %m", fn);
3070 if (r == 0)
3071 r = -EIO;
3072 }
3073
3074 return r;
3075 }
3076
3077 static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
3078 char **arg;
3079 int r;
3080
3081 STRV_FOREACH(arg, args) {
3082 r = read_config_file(config_dirs, *arg, false, invalid_config);
3083 if (r < 0)
3084 return r;
3085 }
3086
3087 return 0;
3088 }
3089
3090 static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
3091 _cleanup_strv_free_ char **files = NULL;
3092 _cleanup_free_ char *p = NULL;
3093 char **f;
3094 int r;
3095
3096 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
3097 if (r < 0)
3098 return r;
3099
3100 STRV_FOREACH(f, files)
3101 if (p && path_equal(*f, p)) {
3102 log_debug("Parsing arguments at position \"%s\"…", *f);
3103
3104 r = parse_arguments(config_dirs, args, invalid_config);
3105 if (r < 0)
3106 return r;
3107 } else
3108 /* Just warn, ignore result otherwise.
3109 * read_config_file() has some debug output, so no need to print anything. */
3110 (void) read_config_file(config_dirs, *f, true, invalid_config);
3111
3112 return 0;
3113 }
3114
3115 static int link_parent(ItemArray *a) {
3116 const char *path;
3117 char *prefix;
3118 int r;
3119
3120 assert(a);
3121
3122 /* Finds the closest "parent" item array for the specified item array. Then registers the specified item array
3123 * as child of it, and fills the parent in, linking them both ways. This allows us to later create parents
3124 * before their children, and clean up/remove children before their parents. */
3125
3126 if (a->n_items <= 0)
3127 return 0;
3128
3129 path = a->items[0].path;
3130 prefix = newa(char, strlen(path) + 1);
3131 PATH_FOREACH_PREFIX(prefix, path) {
3132 ItemArray *j;
3133
3134 j = ordered_hashmap_get(items, prefix);
3135 if (!j)
3136 j = ordered_hashmap_get(globs, prefix);
3137 if (j) {
3138 r = set_ensure_allocated(&j->children, NULL);
3139 if (r < 0)
3140 return log_oom();
3141
3142 r = set_put(j->children, a);
3143 if (r < 0)
3144 return log_oom();
3145
3146 a->parent = j;
3147 return 1;
3148 }
3149 }
3150
3151 return 0;
3152 }
3153
3154 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
3155 ItemArray, item_array_free);
3156
3157 static int run(int argc, char *argv[]) {
3158 _cleanup_strv_free_ char **config_dirs = NULL;
3159 bool invalid_config = false;
3160 Iterator iterator;
3161 ItemArray *a;
3162 enum {
3163 PHASE_REMOVE_AND_CLEAN,
3164 PHASE_CREATE,
3165 _PHASE_MAX
3166 } phase;
3167 int r, k;
3168
3169 r = parse_argv(argc, argv);
3170 if (r <= 0)
3171 return r;
3172
3173 log_setup_service();
3174
3175 /* Descending down file system trees might take a lot of fds */
3176 (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
3177
3178 if (arg_user) {
3179 r = user_config_paths(&config_dirs);
3180 if (r < 0)
3181 return log_error_errno(r, "Failed to initialize configuration directory list: %m");
3182 } else {
3183 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
3184 if (!config_dirs)
3185 return log_oom();
3186 }
3187
3188 if (DEBUG_LOGGING) {
3189 _cleanup_free_ char *t = NULL;
3190
3191 t = strv_join(config_dirs, "\n\t");
3192 if (t)
3193 log_debug("Looking for configuration files in (higher priority first):\n\t%s", t);
3194 }
3195
3196 if (arg_cat_config) {
3197 (void) pager_open(arg_pager_flags);
3198
3199 return cat_config(config_dirs, argv + optind);
3200 }
3201
3202 umask(0022);
3203
3204 mac_selinux_init();
3205
3206 items = ordered_hashmap_new(&item_array_hash_ops);
3207 globs = ordered_hashmap_new(&item_array_hash_ops);
3208 if (!items || !globs)
3209 return log_oom();
3210
3211 /* If command line arguments are specified along with --replace, read all
3212 * configuration files and insert the positional arguments at the specified
3213 * place. Otherwise, if command line arguments are specified, execute just
3214 * them, and finally, without --replace= or any positional arguments, just
3215 * read configuration and execute it.
3216 */
3217 if (arg_replace || optind >= argc)
3218 r = read_config_files(config_dirs, argv + optind, &invalid_config);
3219 else
3220 r = parse_arguments(config_dirs, argv + optind, &invalid_config);
3221 if (r < 0)
3222 return r;
3223
3224 /* Let's now link up all child/parent relationships */
3225 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3226 r = link_parent(a);
3227 if (r < 0)
3228 return r;
3229 }
3230 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3231 r = link_parent(a);
3232 if (r < 0)
3233 return r;
3234 }
3235
3236 /* If multiple operations are requested, let's first run the remove/clean operations, and only then the create
3237 * operations. i.e. that we first clean out the platform we then build on. */
3238 for (phase = 0; phase < _PHASE_MAX; phase++) {
3239 OperationMask op;
3240
3241 if (phase == PHASE_REMOVE_AND_CLEAN)
3242 op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
3243 else if (phase == PHASE_CREATE)
3244 op = arg_operation & OPERATION_CREATE;
3245 else
3246 assert_not_reached("unexpected phase");
3247
3248 if (op == 0) /* Nothing requested in this phase */
3249 continue;
3250
3251 /* The non-globbing ones usually create things, hence we apply them first */
3252 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3253 k = process_item_array(a, op);
3254 if (k < 0 && r >= 0)
3255 r = k;
3256 }
3257
3258 /* The globbing ones usually alter things, hence we apply them second. */
3259 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3260 k = process_item_array(a, op);
3261 if (k < 0 && r >= 0)
3262 r = k;
3263 }
3264 }
3265
3266 if (ERRNO_IS_RESOURCE(-r))
3267 return r;
3268 if (invalid_config)
3269 return EX_DATAERR;
3270 if (r < 0)
3271 return EX_CANTCREAT;
3272 return 0;
3273 }
3274
3275 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
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