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Merge pull request #13940 from keur/protect_kernel_logs
[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
189 { 'g', specifier_group_name, NULL },
190 { 'G', specifier_group_id, NULL },
191 { 'U', specifier_user_id, NULL },
192 { 'u', specifier_user_name, NULL },
193 { 'h', specifier_user_home, NULL },
194
195 { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
196 { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
197 { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
198 { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
199 { 'T', specifier_tmp_dir, NULL },
200 { 'V', specifier_var_tmp_dir, NULL },
201 {}
202 };
203
204 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret) {
205 int r;
206
207 /* If /etc/machine_id is missing or empty (e.g. in a chroot environment)
208 * return a recognizable error so that the caller can skip the rule
209 * gracefully. */
210
211 r = specifier_machine_id(specifier, data, userdata, ret);
212 if (IN_SET(r, -ENOENT, -ENOMEDIUM))
213 return -ENXIO;
214
215 return r;
216 }
217
218 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret) {
219 struct table_entry {
220 uint64_t type;
221 const char *suffix;
222 };
223
224 static const struct table_entry paths_system[] = {
225 [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
226 [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
227 [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
228 [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
229 };
230
231 static const struct table_entry paths_user[] = {
232 [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
233 [DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION },
234 [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
235 [DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
236 };
237
238 unsigned i;
239 const struct table_entry *paths;
240
241 assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
242 paths = arg_user ? paths_user : paths_system;
243
244 i = PTR_TO_UINT(data);
245 assert(i < ELEMENTSOF(paths_system));
246
247 return sd_path_home(paths[i].type, paths[i].suffix, ret);
248 }
249
250 static int log_unresolvable_specifier(const char *filename, unsigned line) {
251 static bool notified = false;
252
253 /* In system mode, this is called when /etc is not fully initialized (e.g.
254 * in a chroot environment) where some specifiers are unresolvable. In user
255 * mode, this is called when some variables are not defined. These cases are
256 * not considered as an error so log at LOG_NOTICE only for the first time
257 * and then downgrade this to LOG_DEBUG for the rest. */
258
259 log_full(notified ? LOG_DEBUG : LOG_NOTICE,
260 "[%s:%u] Failed to resolve specifier: %s, skipping",
261 filename, line,
262 arg_user ? "Required $XDG_... variable not defined" : "uninitialized /etc detected");
263
264 if (!notified)
265 log_notice("All rules containing unresolvable specifiers will be skipped.");
266
267 notified = true;
268 return 0;
269 }
270
271 static int user_config_paths(char*** ret) {
272 _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
273 _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
274 _cleanup_strv_free_ char **res = NULL;
275 int r;
276
277 r = xdg_user_dirs(&config_dirs, &data_dirs);
278 if (r < 0)
279 return r;
280
281 r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
282 if (r < 0 && r != -ENXIO)
283 return r;
284
285 r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
286 if (r < 0 && r != -ENXIO)
287 return r;
288
289 r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
290 if (r < 0 && r != -ENXIO)
291 return r;
292
293 r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
294 if (r < 0)
295 return r;
296
297 r = strv_extend(&res, persistent_config);
298 if (r < 0)
299 return r;
300
301 r = strv_extend(&res, runtime_config);
302 if (r < 0)
303 return r;
304
305 r = strv_extend(&res, data_home);
306 if (r < 0)
307 return r;
308
309 r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
310 if (r < 0)
311 return r;
312
313 r = path_strv_make_absolute_cwd(res);
314 if (r < 0)
315 return r;
316
317 *ret = TAKE_PTR(res);
318 return 0;
319 }
320
321 static bool needs_glob(ItemType t) {
322 return IN_SET(t,
323 WRITE_FILE,
324 IGNORE_PATH,
325 IGNORE_DIRECTORY_PATH,
326 REMOVE_PATH,
327 RECURSIVE_REMOVE_PATH,
328 EMPTY_DIRECTORY,
329 ADJUST_MODE,
330 RELABEL_PATH,
331 RECURSIVE_RELABEL_PATH,
332 SET_XATTR,
333 RECURSIVE_SET_XATTR,
334 SET_ACL,
335 RECURSIVE_SET_ACL,
336 SET_ATTRIBUTE,
337 RECURSIVE_SET_ATTRIBUTE);
338 }
339
340 static bool takes_ownership(ItemType t) {
341 return IN_SET(t,
342 CREATE_FILE,
343 TRUNCATE_FILE,
344 CREATE_DIRECTORY,
345 EMPTY_DIRECTORY,
346 TRUNCATE_DIRECTORY,
347 CREATE_SUBVOLUME,
348 CREATE_SUBVOLUME_INHERIT_QUOTA,
349 CREATE_SUBVOLUME_NEW_QUOTA,
350 CREATE_FIFO,
351 CREATE_SYMLINK,
352 CREATE_CHAR_DEVICE,
353 CREATE_BLOCK_DEVICE,
354 COPY_FILES,
355 WRITE_FILE,
356 IGNORE_PATH,
357 IGNORE_DIRECTORY_PATH,
358 REMOVE_PATH,
359 RECURSIVE_REMOVE_PATH);
360 }
361
362 static struct Item* find_glob(OrderedHashmap *h, const char *match) {
363 ItemArray *j;
364 Iterator i;
365
366 ORDERED_HASHMAP_FOREACH(j, h, i) {
367 size_t n;
368
369 for (n = 0; n < j->n_items; n++) {
370 Item *item = j->items + n;
371
372 if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
373 return item;
374 }
375 }
376
377 return NULL;
378 }
379
380 static int load_unix_sockets(void) {
381 _cleanup_set_free_free_ Set *sockets = NULL;
382 _cleanup_fclose_ FILE *f = NULL;
383 int r;
384
385 if (unix_sockets)
386 return 0;
387
388 /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
389
390 sockets = set_new(&path_hash_ops);
391 if (!sockets)
392 return log_oom();
393
394 f = fopen("/proc/net/unix", "re");
395 if (!f)
396 return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
397 "Failed to open /proc/net/unix, ignoring: %m");
398
399 /* Skip header */
400 r = read_line(f, LONG_LINE_MAX, NULL);
401 if (r < 0)
402 return log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
403 if (r == 0)
404 return log_warning_errno(SYNTHETIC_ERRNO(EIO), "Premature end of file reading /proc/net/unix.");
405
406 for (;;) {
407 _cleanup_free_ char *line = NULL, *s = NULL;
408 char *p;
409
410 r = read_line(f, LONG_LINE_MAX, &line);
411 if (r < 0)
412 return log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
413 if (r == 0) /* EOF */
414 break;
415
416 p = strchr(line, ':');
417 if (!p)
418 continue;
419
420 if (strlen(p) < 37)
421 continue;
422
423 p += 37;
424 p += strspn(p, WHITESPACE);
425 p += strcspn(p, WHITESPACE); /* skip one more word */
426 p += strspn(p, WHITESPACE);
427
428 if (*p != '/')
429 continue;
430
431 s = strdup(p);
432 if (!s)
433 return log_oom();
434
435 path_simplify(s, false);
436
437 r = set_consume(sockets, s);
438 if (r == -EEXIST)
439 continue;
440 if (r < 0)
441 return log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
442
443 TAKE_PTR(s);
444 }
445
446 unix_sockets = TAKE_PTR(sockets);
447 return 1;
448 }
449
450 static bool unix_socket_alive(const char *fn) {
451 assert(fn);
452
453 if (load_unix_sockets() < 0)
454 return true; /* We don't know, so assume yes */
455
456 return !!set_get(unix_sockets, (char*) fn);
457 }
458
459 static DIR* xopendirat_nomod(int dirfd, const char *path) {
460 DIR *dir;
461
462 dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
463 if (dir)
464 return dir;
465
466 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
467 if (errno != EPERM)
468 return NULL;
469
470 dir = xopendirat(dirfd, path, O_NOFOLLOW);
471 if (!dir)
472 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
473
474 return dir;
475 }
476
477 static DIR* opendir_nomod(const char *path) {
478 return xopendirat_nomod(AT_FDCWD, path);
479 }
480
481 static int dir_cleanup(
482 Item *i,
483 const char *p,
484 DIR *d,
485 const struct stat *ds,
486 usec_t cutoff,
487 dev_t rootdev,
488 bool mountpoint,
489 int maxdepth,
490 bool keep_this_level) {
491
492 struct dirent *dent;
493 bool deleted = false;
494 int r = 0;
495
496 FOREACH_DIRENT_ALL(dent, d, break) {
497 struct stat s;
498 usec_t age;
499 _cleanup_free_ char *sub_path = NULL;
500
501 if (dot_or_dot_dot(dent->d_name))
502 continue;
503
504 if (fstatat(dirfd(d), dent->d_name, &s, AT_SYMLINK_NOFOLLOW) < 0) {
505 if (errno == ENOENT)
506 continue;
507
508 /* FUSE, NFS mounts, SELinux might return EACCES */
509 r = log_full_errno(errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
510 "stat(%s/%s) failed: %m", p, dent->d_name);
511 continue;
512 }
513
514 /* Stay on the same filesystem */
515 if (s.st_dev != rootdev) {
516 log_debug("Ignoring \"%s/%s\": different filesystem.", p, dent->d_name);
517 continue;
518 }
519
520 /* Try to detect bind mounts of the same filesystem instance; they
521 * do not differ in device major/minors. This type of query is not
522 * supported on all kernels or filesystem types though. */
523 if (S_ISDIR(s.st_mode)) {
524 int q;
525
526 q = fd_is_mount_point(dirfd(d), dent->d_name, 0);
527 if (q < 0)
528 log_debug_errno(q, "Failed to determine whether \"%s/%s\" is a mount point, ignoring: %m", p, dent->d_name);
529 else if (q > 0) {
530 log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.", p, dent->d_name);
531 continue;
532 }
533 }
534
535 sub_path = path_join(p, dent->d_name);
536 if (!sub_path) {
537 r = log_oom();
538 goto finish;
539 }
540
541 /* Is there an item configured for this path? */
542 if (ordered_hashmap_get(items, sub_path)) {
543 log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
544 continue;
545 }
546
547 if (find_glob(globs, sub_path)) {
548 log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
549 continue;
550 }
551
552 if (S_ISDIR(s.st_mode)) {
553 _cleanup_closedir_ DIR *sub_dir = NULL;
554
555 if (mountpoint &&
556 streq(dent->d_name, "lost+found") &&
557 s.st_uid == 0) {
558 log_debug("Ignoring directory \"%s\".", sub_path);
559 continue;
560 }
561
562 if (maxdepth <= 0)
563 log_warning("Reached max depth on \"%s\".", sub_path);
564 else {
565 int q;
566
567 sub_dir = xopendirat_nomod(dirfd(d), dent->d_name);
568 if (!sub_dir) {
569 if (errno != ENOENT)
570 r = log_warning_errno(errno, "Opening directory \"%s\" failed, ignoring: %m", sub_path);
571
572 continue;
573 }
574
575 if (flock(dirfd(sub_dir), LOCK_EX|LOCK_NB) < 0) {
576 log_debug_errno(errno, "Couldn't acquire shared BSD lock on directory \"%s\", skipping: %m", p);
577 continue;
578 }
579
580 q = dir_cleanup(i, sub_path, sub_dir, &s, cutoff, rootdev, false, maxdepth-1, false);
581 if (q < 0)
582 r = q;
583 }
584
585 /* Note: if you are wondering why we don't support the sticky bit for excluding
586 * directories from cleaning like we do it for other file system objects: well, the
587 * sticky bit already has a meaning for directories, so we don't want to overload
588 * that. */
589
590 if (keep_this_level) {
591 log_debug("Keeping directory \"%s\".", sub_path);
592 continue;
593 }
594
595 /* Ignore ctime, we change it when deleting */
596 age = timespec_load(&s.st_mtim);
597 if (age >= cutoff) {
598 char a[FORMAT_TIMESTAMP_MAX];
599 /* Follows spelling in stat(1). */
600 log_debug("Directory \"%s\": modify time %s is too new.",
601 sub_path,
602 format_timestamp_us(a, sizeof(a), age));
603 continue;
604 }
605
606 age = timespec_load(&s.st_atim);
607 if (age >= cutoff) {
608 char a[FORMAT_TIMESTAMP_MAX];
609 log_debug("Directory \"%s\": access time %s is too new.",
610 sub_path,
611 format_timestamp_us(a, sizeof(a), age));
612 continue;
613 }
614
615 log_debug("Removing directory \"%s\".", sub_path);
616 if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0)
617 if (!IN_SET(errno, ENOENT, ENOTEMPTY))
618 r = log_warning_errno(errno, "Failed to remove directory \"%s\", ignoring: %m", sub_path);
619
620 } else {
621 /* Skip files for which the sticky bit is set. These are semantics we define, and are
622 * unknown elsewhere. See XDG_RUNTIME_DIR specification for details. */
623 if (s.st_mode & S_ISVTX) {
624 log_debug("Skipping \"%s\": sticky bit set.", sub_path);
625 continue;
626 }
627
628 if (mountpoint &&
629 S_ISREG(s.st_mode) &&
630 s.st_uid == 0 &&
631 STR_IN_SET(dent->d_name,
632 ".journal",
633 "aquota.user",
634 "aquota.group")) {
635 log_debug("Skipping \"%s\".", sub_path);
636 continue;
637 }
638
639 /* Ignore sockets that are listed in /proc/net/unix */
640 if (S_ISSOCK(s.st_mode) && unix_socket_alive(sub_path)) {
641 log_debug("Skipping \"%s\": live socket.", sub_path);
642 continue;
643 }
644
645 /* Ignore device nodes */
646 if (S_ISCHR(s.st_mode) || S_ISBLK(s.st_mode)) {
647 log_debug("Skipping \"%s\": a device.", sub_path);
648 continue;
649 }
650
651 /* Keep files on this level around if this is requested */
652 if (keep_this_level) {
653 log_debug("Keeping \"%s\".", sub_path);
654 continue;
655 }
656
657 age = timespec_load(&s.st_mtim);
658 if (age >= cutoff) {
659 char a[FORMAT_TIMESTAMP_MAX];
660 /* Follows spelling in stat(1). */
661 log_debug("File \"%s\": modify time %s is too new.",
662 sub_path,
663 format_timestamp_us(a, sizeof(a), age));
664 continue;
665 }
666
667 age = timespec_load(&s.st_atim);
668 if (age >= cutoff) {
669 char a[FORMAT_TIMESTAMP_MAX];
670 log_debug("File \"%s\": access time %s is too new.",
671 sub_path,
672 format_timestamp_us(a, sizeof(a), age));
673 continue;
674 }
675
676 age = timespec_load(&s.st_ctim);
677 if (age >= cutoff) {
678 char a[FORMAT_TIMESTAMP_MAX];
679 log_debug("File \"%s\": change time %s is too new.",
680 sub_path,
681 format_timestamp_us(a, sizeof(a), age));
682 continue;
683 }
684
685 log_debug("Removing \"%s\".", sub_path);
686 if (unlinkat(dirfd(d), dent->d_name, 0) < 0)
687 if (errno != ENOENT)
688 r = log_warning_errno(errno, "Failed to remove \"%s\", ignoring: %m", sub_path);
689
690 deleted = true;
691 }
692 }
693
694 finish:
695 if (deleted) {
696 char a[FORMAT_TIMESTAMP_MAX], b[FORMAT_TIMESTAMP_MAX];
697 usec_t age1, age2;
698
699 age1 = timespec_load(&ds->st_atim);
700 age2 = timespec_load(&ds->st_mtim);
701
702 log_debug("Restoring access and modification time on \"%s\": %s, %s",
703 p,
704 format_timestamp_us(a, sizeof(a), age1),
705 format_timestamp_us(b, sizeof(b), age2));
706
707 /* Restore original directory timestamps */
708 if (futimens(dirfd(d), (struct timespec[]) {
709 ds->st_atim,
710 ds->st_mtim }) < 0)
711 log_warning_errno(errno, "Failed to revert timestamps of '%s', ignoring: %m", p);
712 }
713
714 return r;
715 }
716
717 static bool dangerous_hardlinks(void) {
718 _cleanup_free_ char *value = NULL;
719 static int cached = -1;
720 int r;
721
722 /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
723 * what the upstream default is. */
724
725 if (cached >= 0)
726 return cached;
727
728 r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
729 if (r < 0) {
730 log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
731 return true;
732 }
733
734 r = parse_boolean(value);
735 if (r < 0) {
736 log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
737 return true;
738 }
739
740 cached = r == 0;
741 return cached;
742 }
743
744 static bool hardlink_vulnerable(const struct stat *st) {
745 assert(st);
746
747 return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
748 }
749
750 static mode_t process_mask_perms(mode_t mode, mode_t current) {
751
752 if ((current & 0111) == 0)
753 mode &= ~0111;
754 if ((current & 0222) == 0)
755 mode &= ~0222;
756 if ((current & 0444) == 0)
757 mode &= ~0444;
758 if (!S_ISDIR(current))
759 mode &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
760
761 return mode;
762 }
763
764 static int fd_set_perms(Item *i, int fd, const char *path, const struct stat *st) {
765 struct stat stbuf;
766 mode_t new_mode;
767 bool do_chown;
768
769 assert(i);
770 assert(fd);
771 assert(path);
772
773 if (!i->mode_set && !i->uid_set && !i->gid_set)
774 goto shortcut;
775
776 if (!st) {
777 if (fstat(fd, &stbuf) < 0)
778 return log_error_errno(errno, "fstat(%s) failed: %m", path);
779 st = &stbuf;
780 }
781
782 if (hardlink_vulnerable(st))
783 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
784 "Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
785 path);
786
787 /* Do we need a chown()? */
788 do_chown =
789 (i->uid_set && i->uid != st->st_uid) ||
790 (i->gid_set && i->gid != st->st_gid);
791
792 /* Calculate the mode to apply */
793 new_mode = i->mode_set ? (i->mask_perms ?
794 process_mask_perms(i->mode, st->st_mode) :
795 i->mode) :
796 (st->st_mode & 07777);
797
798 if (i->mode_set && do_chown) {
799 /* Before we issue the chmod() let's reduce the access mode to the common bits of the old and
800 * the new mode. That way there's no time window where the file exists under the old owner
801 * with more than the old access modes — and not under the new owner with more than the new
802 * access modes either. */
803
804 if (S_ISLNK(st->st_mode))
805 log_debug("Skipping temporary mode fix for symlink %s.", path);
806 else {
807 mode_t m = new_mode & st->st_mode; /* Mask new mode by old mode */
808
809 if (((m ^ st->st_mode) & 07777) == 0)
810 log_debug("\"%s\" matches temporary mode %o already.", path, m);
811 else {
812 log_debug("Temporarily changing \"%s\" to mode %o.", path, m);
813 if (fchmod_opath(fd, m) < 0)
814 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
815 }
816 }
817 }
818
819 if (do_chown) {
820 log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT,
821 path,
822 i->uid_set ? i->uid : UID_INVALID,
823 i->gid_set ? i->gid : GID_INVALID);
824
825 if (fchownat(fd,
826 "",
827 i->uid_set ? i->uid : UID_INVALID,
828 i->gid_set ? i->gid : GID_INVALID,
829 AT_EMPTY_PATH) < 0)
830 return log_error_errno(errno, "fchownat() of %s failed: %m", path);
831 }
832
833 /* Now, apply the final mode. We do this in two cases: when the user set a mode explicitly, or after a
834 * chown(), since chown()'s mangle the access mode in regards to sgid/suid in some conditions. */
835 if (i->mode_set || do_chown) {
836 if (S_ISLNK(st->st_mode))
837 log_debug("Skipping mode fix for symlink %s.", path);
838 else {
839 /* Check if the chmod() is unnecessary. Note that if we did a chown() before we always
840 * chmod() here again, since it might have mangled the bits. */
841 if (!do_chown && ((new_mode ^ st->st_mode) & 07777) == 0)
842 log_debug("\"%s\" matches mode %o already.", path, new_mode);
843 else {
844 log_debug("Changing \"%s\" to mode %o.", path, new_mode);
845 if (fchmod_opath(fd, new_mode) < 0)
846 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
847 }
848 }
849 }
850
851 shortcut:
852 return label_fix(path, 0);
853 }
854
855 static int path_open_parent_safe(const char *path) {
856 _cleanup_free_ char *dn = NULL;
857 int r, fd;
858
859 if (path_equal(path, "/") || !path_is_normalized(path))
860 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
861 "Failed to open parent of '%s': invalid path.",
862 path);
863
864 dn = dirname_malloc(path);
865 if (!dn)
866 return log_oom();
867
868 r = chase_symlinks(dn, arg_root, CHASE_SAFE|CHASE_WARN, NULL, &fd);
869 if (r < 0 && r != -ENOLINK)
870 return log_error_errno(r, "Failed to validate path %s: %m", path);
871
872 return r < 0 ? r : fd;
873 }
874
875 static int path_open_safe(const char *path) {
876 int r, fd;
877
878 /* path_open_safe() returns a file descriptor opened with O_PATH after
879 * verifying that the path doesn't contain unsafe transitions, except
880 * for its final component as the function does not follow symlink. */
881
882 assert(path);
883
884 if (!path_is_normalized(path))
885 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
886 "Failed to open invalid path '%s'.",
887 path);
888
889 r = chase_symlinks(path, arg_root, CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL, &fd);
890 if (r < 0 && r != -ENOLINK)
891 return log_error_errno(r, "Failed to validate path %s: %m", path);
892
893 return r < 0 ? r : fd;
894 }
895
896 static int path_set_perms(Item *i, const char *path) {
897 _cleanup_close_ int fd = -1;
898
899 assert(i);
900 assert(path);
901
902 fd = path_open_safe(path);
903 if (fd < 0)
904 return fd;
905
906 return fd_set_perms(i, fd, path, NULL);
907 }
908
909 static int parse_xattrs_from_arg(Item *i) {
910 const char *p;
911 int r;
912
913 assert(i);
914 assert(i->argument);
915
916 p = i->argument;
917
918 for (;;) {
919 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
920
921 r = extract_first_word(&p, &xattr, NULL, EXTRACT_UNQUOTE|EXTRACT_CUNESCAPE);
922 if (r < 0)
923 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
924 if (r <= 0)
925 break;
926
927 r = split_pair(xattr, "=", &name, &value);
928 if (r < 0) {
929 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
930 continue;
931 }
932
933 if (isempty(name) || isempty(value)) {
934 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
935 continue;
936 }
937
938 if (strv_push_pair(&i->xattrs, name, value) < 0)
939 return log_oom();
940
941 name = value = NULL;
942 }
943
944 return 0;
945 }
946
947 static int fd_set_xattrs(Item *i, int fd, const char *path, const struct stat *st) {
948 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
949 char **name, **value;
950
951 assert(i);
952 assert(fd);
953 assert(path);
954
955 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
956
957 STRV_FOREACH_PAIR(name, value, i->xattrs) {
958 log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
959 if (setxattr(procfs_path, *name, *value, strlen(*value), 0) < 0)
960 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
961 *name, *value, path);
962 }
963 return 0;
964 }
965
966 static int path_set_xattrs(Item *i, const char *path) {
967 _cleanup_close_ int fd = -1;
968
969 assert(i);
970 assert(path);
971
972 fd = path_open_safe(path);
973 if (fd < 0)
974 return fd;
975
976 return fd_set_xattrs(i, fd, path, NULL);
977 }
978
979 static int parse_acls_from_arg(Item *item) {
980 #if HAVE_ACL
981 int r;
982
983 assert(item);
984
985 /* If append_or_force (= modify) is set, we will not modify the acl
986 * afterwards, so the mask can be added now if necessary. */
987
988 r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->append_or_force);
989 if (r < 0)
990 log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
991 #else
992 log_warning_errno(SYNTHETIC_ERRNO(ENOSYS), "ACLs are not supported. Ignoring");
993 #endif
994
995 return 0;
996 }
997
998 #if HAVE_ACL
999 static int path_set_acl(const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) {
1000 _cleanup_(acl_free_charpp) char *t = NULL;
1001 _cleanup_(acl_freep) acl_t dup = NULL;
1002 int r;
1003
1004 /* Returns 0 for success, positive error if already warned,
1005 * negative error otherwise. */
1006
1007 if (modify) {
1008 r = acls_for_file(path, type, acl, &dup);
1009 if (r < 0)
1010 return r;
1011
1012 r = calc_acl_mask_if_needed(&dup);
1013 if (r < 0)
1014 return r;
1015 } else {
1016 dup = acl_dup(acl);
1017 if (!dup)
1018 return -errno;
1019
1020 /* the mask was already added earlier if needed */
1021 }
1022
1023 r = add_base_acls_if_needed(&dup, path);
1024 if (r < 0)
1025 return r;
1026
1027 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
1028 log_debug("Setting %s ACL %s on %s.",
1029 type == ACL_TYPE_ACCESS ? "access" : "default",
1030 strna(t), pretty);
1031
1032 r = acl_set_file(path, type, dup);
1033 if (r < 0)
1034 /* Return positive to indicate we already warned */
1035 return -log_error_errno(errno,
1036 "Setting %s ACL \"%s\" on %s failed: %m",
1037 type == ACL_TYPE_ACCESS ? "access" : "default",
1038 strna(t), pretty);
1039
1040 return 0;
1041 }
1042 #endif
1043
1044 static int fd_set_acls(Item *item, int fd, const char *path, const struct stat *st) {
1045 int r = 0;
1046 #if HAVE_ACL
1047 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1048 struct stat stbuf;
1049
1050 assert(item);
1051 assert(fd);
1052 assert(path);
1053
1054 if (!st) {
1055 if (fstat(fd, &stbuf) < 0)
1056 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1057 st = &stbuf;
1058 }
1059
1060 if (hardlink_vulnerable(st))
1061 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
1062 "Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
1063 path);
1064
1065 if (S_ISLNK(st->st_mode)) {
1066 log_debug("Skipping ACL fix for symlink %s.", path);
1067 return 0;
1068 }
1069
1070 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1071
1072 if (item->acl_access)
1073 r = path_set_acl(procfs_path, path, ACL_TYPE_ACCESS, item->acl_access, item->append_or_force);
1074
1075 /* set only default acls to folders */
1076 if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
1077 r = path_set_acl(procfs_path, path, ACL_TYPE_DEFAULT, item->acl_default, item->append_or_force);
1078
1079 if (r > 0)
1080 return -r; /* already warned */
1081 if (r == -EOPNOTSUPP) {
1082 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1083 return 0;
1084 }
1085 if (r < 0)
1086 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1087 #endif
1088 return r;
1089 }
1090
1091 static int path_set_acls(Item *item, const char *path) {
1092 int r = 0;
1093 #if HAVE_ACL
1094 _cleanup_close_ int fd = -1;
1095
1096 assert(item);
1097 assert(path);
1098
1099 fd = path_open_safe(path);
1100 if (fd < 0)
1101 return fd;
1102
1103 r = fd_set_acls(item, fd, path, NULL);
1104 #endif
1105 return r;
1106 }
1107
1108 static int parse_attribute_from_arg(Item *item) {
1109
1110 static const struct {
1111 char character;
1112 unsigned value;
1113 } attributes[] = {
1114 { 'A', FS_NOATIME_FL }, /* do not update atime */
1115 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1116 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1117 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1118 { 'c', FS_COMPR_FL }, /* Compress file */
1119 { 'd', FS_NODUMP_FL }, /* do not dump file */
1120 { 'e', FS_EXTENT_FL }, /* Extents */
1121 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1122 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1123 { 's', FS_SECRM_FL }, /* Secure deletion */
1124 { 'u', FS_UNRM_FL }, /* Undelete */
1125 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1126 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1127 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1128 { 'P', FS_PROJINHERIT_FL }, /* Inherit the quota project ID */
1129 };
1130
1131 enum {
1132 MODE_ADD,
1133 MODE_DEL,
1134 MODE_SET
1135 } mode = MODE_ADD;
1136
1137 unsigned value = 0, mask = 0;
1138 const char *p;
1139
1140 assert(item);
1141
1142 p = item->argument;
1143 if (p) {
1144 if (*p == '+') {
1145 mode = MODE_ADD;
1146 p++;
1147 } else if (*p == '-') {
1148 mode = MODE_DEL;
1149 p++;
1150 } else if (*p == '=') {
1151 mode = MODE_SET;
1152 p++;
1153 }
1154 }
1155
1156 if (isempty(p) && mode != MODE_SET)
1157 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1158 "Setting file attribute on '%s' needs an attribute specification.",
1159 item->path);
1160
1161 for (; p && *p ; p++) {
1162 unsigned i, v;
1163
1164 for (i = 0; i < ELEMENTSOF(attributes); i++)
1165 if (*p == attributes[i].character)
1166 break;
1167
1168 if (i >= ELEMENTSOF(attributes))
1169 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1170 "Unknown file attribute '%c' on '%s'.",
1171 *p, item->path);
1172
1173 v = attributes[i].value;
1174
1175 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1176
1177 mask |= v;
1178 }
1179
1180 if (mode == MODE_SET)
1181 mask |= CHATTR_ALL_FL;
1182
1183 assert(mask != 0);
1184
1185 item->attribute_mask = mask;
1186 item->attribute_value = value;
1187 item->attribute_set = true;
1188
1189 return 0;
1190 }
1191
1192 static int fd_set_attribute(Item *item, int fd, const char *path, const struct stat *st) {
1193 _cleanup_close_ int procfs_fd = -1;
1194 struct stat stbuf;
1195 unsigned f;
1196 int r;
1197
1198 assert(item);
1199 assert(fd);
1200 assert(path);
1201
1202 if (!item->attribute_set || item->attribute_mask == 0)
1203 return 0;
1204
1205 if (!st) {
1206 if (fstat(fd, &stbuf) < 0)
1207 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1208 st = &stbuf;
1209 }
1210
1211 /* Issuing the file attribute ioctls on device nodes is not
1212 * safe, as that will be delivered to the drivers, not the
1213 * file system containing the device node. */
1214 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
1215 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1216 "Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
1217 path);
1218
1219 f = item->attribute_value & item->attribute_mask;
1220
1221 /* Mask away directory-specific flags */
1222 if (!S_ISDIR(st->st_mode))
1223 f &= ~FS_DIRSYNC_FL;
1224
1225 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1226 if (procfs_fd < 0)
1227 return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
1228
1229 r = chattr_fd(procfs_fd, f, item->attribute_mask, NULL);
1230 if (r < 0)
1231 log_full_errno(IN_SET(r, -ENOTTY, -EOPNOTSUPP) ? LOG_DEBUG : LOG_WARNING,
1232 r,
1233 "Cannot set file attribute for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1234 path, item->attribute_value, item->attribute_mask);
1235
1236 return 0;
1237 }
1238
1239 static int path_set_attribute(Item *item, const char *path) {
1240 _cleanup_close_ int fd = -1;
1241
1242 if (!item->attribute_set || item->attribute_mask == 0)
1243 return 0;
1244
1245 fd = path_open_safe(path);
1246 if (fd < 0)
1247 return fd;
1248
1249 return fd_set_attribute(item, fd, path, NULL);
1250 }
1251
1252 static int write_one_file(Item *i, const char *path) {
1253 _cleanup_close_ int fd = -1, dir_fd = -1;
1254 char *bn;
1255 int flags, r;
1256
1257 assert(i);
1258 assert(path);
1259 assert(i->argument);
1260 assert(i->type == WRITE_FILE);
1261
1262 /* Validate the path and keep the fd on the directory for opening the
1263 * file so we're sure that it can't be changed behind our back. */
1264 dir_fd = path_open_parent_safe(path);
1265 if (dir_fd < 0)
1266 return dir_fd;
1267
1268 bn = basename(path);
1269
1270 flags = O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY;
1271
1272 /* Follows symlinks */
1273 fd = openat(dir_fd, bn, i->append_or_force ? flags|O_APPEND : flags, i->mode);
1274 if (fd < 0) {
1275 if (errno == ENOENT) {
1276 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1277 return 0;
1278 }
1279 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1280 }
1281
1282 /* 'w' is allowed to write into any kind of files. */
1283 log_debug("Writing to \"%s\".", path);
1284
1285 r = loop_write(fd, i->argument, strlen(i->argument), false);
1286 if (r < 0)
1287 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1288
1289 return fd_set_perms(i, fd, path, NULL);
1290 }
1291
1292 static int create_file(Item *i, const char *path) {
1293 _cleanup_close_ int fd = -1, dir_fd = -1;
1294 struct stat stbuf, *st = NULL;
1295 int r = 0;
1296 char *bn;
1297
1298 assert(i);
1299 assert(path);
1300 assert(i->type == CREATE_FILE);
1301
1302 /* 'f' operates on regular files exclusively. */
1303
1304 /* Validate the path and keep the fd on the directory for opening the
1305 * file so we're sure that it can't be changed behind our back. */
1306 dir_fd = path_open_parent_safe(path);
1307 if (dir_fd < 0)
1308 return dir_fd;
1309
1310 bn = basename(path);
1311
1312 RUN_WITH_UMASK(0000) {
1313 mac_selinux_create_file_prepare(path, S_IFREG);
1314 fd = openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1315 mac_selinux_create_file_clear();
1316 }
1317
1318 if (fd < 0) {
1319 /* Even on a read-only filesystem, open(2) returns EEXIST if the
1320 * file already exists. It returns EROFS only if it needs to
1321 * create the file. */
1322 if (errno != EEXIST)
1323 return log_error_errno(errno, "Failed to create file %s: %m", path);
1324
1325 /* Re-open the file. At that point it must exist since open(2)
1326 * failed with EEXIST. We still need to check if the perms/mode
1327 * need to be changed. For read-only filesystems, we let
1328 * fd_set_perms() report the error if the perms need to be
1329 * modified. */
1330 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1331 if (fd < 0)
1332 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1333
1334 if (fstat(fd, &stbuf) < 0)
1335 return log_error_errno(errno, "stat(%s) failed: %m", path);
1336
1337 if (!S_ISREG(stbuf.st_mode)) {
1338 log_error("%s exists and is not a regular file.", path);
1339 return -EEXIST;
1340 }
1341
1342 st = &stbuf;
1343 } else {
1344
1345 log_debug("\"%s\" has been created.", path);
1346
1347 if (i->argument) {
1348 log_debug("Writing to \"%s\".", path);
1349
1350 r = loop_write(fd, i->argument, strlen(i->argument), false);
1351 if (r < 0)
1352 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1353 }
1354 }
1355
1356 return fd_set_perms(i, fd, path, st);
1357 }
1358
1359 static int truncate_file(Item *i, const char *path) {
1360 _cleanup_close_ int fd = -1, dir_fd = -1;
1361 struct stat stbuf, *st = NULL;
1362 bool erofs = false;
1363 int r = 0;
1364 char *bn;
1365
1366 assert(i);
1367 assert(path);
1368 assert(i->type == TRUNCATE_FILE || (i->type == CREATE_FILE && i->append_or_force));
1369
1370 /* We want to operate on regular file exclusively especially since
1371 * O_TRUNC is unspecified if the file is neither a regular file nor a
1372 * fifo nor a terminal device. Therefore we first open the file and make
1373 * sure it's a regular one before truncating it. */
1374
1375 /* Validate the path and keep the fd on the directory for opening the
1376 * file so we're sure that it can't be changed behind our back. */
1377 dir_fd = path_open_parent_safe(path);
1378 if (dir_fd < 0)
1379 return dir_fd;
1380
1381 bn = basename(path);
1382
1383 RUN_WITH_UMASK(0000) {
1384 mac_selinux_create_file_prepare(path, S_IFREG);
1385 fd = openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1386 mac_selinux_create_file_clear();
1387 }
1388
1389 if (fd < 0) {
1390 if (errno != EROFS)
1391 return log_error_errno(errno, "Failed to open/create file %s: %m", path);
1392
1393 /* On a read-only filesystem, we don't want to fail if the
1394 * target is already empty and the perms are set. So we still
1395 * proceed with the sanity checks and let the remaining
1396 * operations fail with EROFS if they try to modify the target
1397 * file. */
1398
1399 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1400 if (fd < 0) {
1401 if (errno == ENOENT) {
1402 log_error("Cannot create file %s on a read-only file system.", path);
1403 return -EROFS;
1404 }
1405
1406 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1407 }
1408
1409 erofs = true;
1410 }
1411
1412 if (fstat(fd, &stbuf) < 0)
1413 return log_error_errno(errno, "stat(%s) failed: %m", path);
1414
1415 if (!S_ISREG(stbuf.st_mode)) {
1416 log_error("%s exists and is not a regular file.", path);
1417 return -EEXIST;
1418 }
1419
1420 if (stbuf.st_size > 0) {
1421 if (ftruncate(fd, 0) < 0) {
1422 r = erofs ? -EROFS : -errno;
1423 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1424 }
1425 } else
1426 st = &stbuf;
1427
1428 log_debug("\"%s\" has been created.", path);
1429
1430 if (i->argument) {
1431 log_debug("Writing to \"%s\".", path);
1432
1433 r = loop_write(fd, i->argument, strlen(i->argument), false);
1434 if (r < 0) {
1435 r = erofs ? -EROFS : r;
1436 return log_error_errno(r, "Failed to write file %s: %m", path);
1437 }
1438 }
1439
1440 return fd_set_perms(i, fd, path, st);
1441 }
1442
1443 static int copy_files(Item *i) {
1444 _cleanup_close_ int dfd = -1, fd = -1;
1445 char *bn;
1446 int r;
1447
1448 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1449
1450 bn = basename(i->path);
1451
1452 /* Validate the path and use the returned directory fd for copying the
1453 * target so we're sure that the path can't be changed behind our
1454 * back. */
1455 dfd = path_open_parent_safe(i->path);
1456 if (dfd < 0)
1457 return dfd;
1458
1459 r = copy_tree_at(AT_FDCWD, i->argument,
1460 dfd, bn,
1461 i->uid_set ? i->uid : UID_INVALID,
1462 i->gid_set ? i->gid : GID_INVALID,
1463 COPY_REFLINK | COPY_MERGE_EMPTY);
1464 if (r < 0) {
1465 struct stat a, b;
1466
1467 /* If the target already exists on read-only filesystems, trying
1468 * to create the target will not fail with EEXIST but with
1469 * EROFS. */
1470 if (r == -EROFS && faccessat(dfd, bn, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
1471 r = -EEXIST;
1472
1473 if (r != -EEXIST)
1474 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1475
1476 if (stat(i->argument, &a) < 0)
1477 return log_error_errno(errno, "stat(%s) failed: %m", i->argument);
1478
1479 if (fstatat(dfd, bn, &b, AT_SYMLINK_NOFOLLOW) < 0)
1480 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1481
1482 if ((a.st_mode ^ b.st_mode) & S_IFMT) {
1483 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1484 return 0;
1485 }
1486 }
1487
1488 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1489 if (fd < 0)
1490 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1491
1492 return fd_set_perms(i, fd, i->path, NULL);
1493 }
1494
1495 typedef enum {
1496 CREATION_NORMAL,
1497 CREATION_EXISTING,
1498 CREATION_FORCE,
1499 _CREATION_MODE_MAX,
1500 _CREATION_MODE_INVALID = -1
1501 } CreationMode;
1502
1503 static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = {
1504 [CREATION_NORMAL] = "Created",
1505 [CREATION_EXISTING] = "Found existing",
1506 [CREATION_FORCE] = "Created replacement",
1507 };
1508
1509 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
1510
1511 static int create_directory_or_subvolume(const char *path, mode_t mode, bool subvol, CreationMode *creation) {
1512 _cleanup_close_ int pfd = -1;
1513 CreationMode c;
1514 int r;
1515
1516 assert(path);
1517
1518 if (!creation)
1519 creation = &c;
1520
1521 pfd = path_open_parent_safe(path);
1522 if (pfd < 0)
1523 return pfd;
1524
1525 if (subvol) {
1526 if (btrfs_is_subvol(empty_to_root(arg_root)) <= 0)
1527
1528 /* Don't create a subvolume unless the root directory is
1529 * one, too. We do this under the assumption that if the
1530 * root directory is just a plain directory (i.e. very
1531 * light-weight), we shouldn't try to split it up into
1532 * subvolumes (i.e. more heavy-weight). Thus, chroot()
1533 * environments and suchlike will get a full brtfs
1534 * subvolume set up below their tree only if they
1535 * specifically set up a btrfs subvolume for the root
1536 * dir too. */
1537
1538 subvol = false;
1539 else {
1540 RUN_WITH_UMASK((~mode) & 0777)
1541 r = btrfs_subvol_make_fd(pfd, basename(path));
1542 }
1543 } else
1544 r = 0;
1545
1546 if (!subvol || r == -ENOTTY)
1547 RUN_WITH_UMASK(0000)
1548 r = mkdirat_label(pfd, basename(path), mode);
1549
1550 if (r < 0) {
1551 int k;
1552
1553 if (!IN_SET(r, -EEXIST, -EROFS))
1554 return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", path);
1555
1556 k = is_dir_fd(pfd);
1557 if (k == -ENOENT && r == -EROFS)
1558 return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", path);
1559 if (k < 0)
1560 return log_error_errno(k, "Failed to check if %s exists: %m", path);
1561 if (!k) {
1562 log_warning("\"%s\" already exists and is not a directory.", path);
1563 return -EEXIST;
1564 }
1565
1566 *creation = CREATION_EXISTING;
1567 } else
1568 *creation = CREATION_NORMAL;
1569
1570 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(*creation), path);
1571
1572 r = openat(pfd, basename(path), O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
1573 if (r < 0)
1574 return log_error_errno(errno, "Failed to open directory '%s': %m", basename(path));
1575
1576 return r;
1577 }
1578
1579 static int create_directory(Item *i, const char *path) {
1580 _cleanup_close_ int fd = -1;
1581
1582 assert(i);
1583 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
1584
1585 fd = create_directory_or_subvolume(path, i->mode, false, NULL);
1586 if (fd == -EEXIST)
1587 return 0;
1588 if (fd < 0)
1589 return fd;
1590
1591 return fd_set_perms(i, fd, path, NULL);
1592 }
1593
1594 static int create_subvolume(Item *i, const char *path) {
1595 _cleanup_close_ int fd = -1;
1596 CreationMode creation;
1597 int r, q = 0;
1598
1599 assert(i);
1600 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
1601
1602 fd = create_directory_or_subvolume(path, i->mode, true, &creation);
1603 if (fd == -EEXIST)
1604 return 0;
1605 if (fd < 0)
1606 return fd;
1607
1608 if (creation == CREATION_NORMAL &&
1609 IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
1610 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
1611 if (r == -ENOTTY)
1612 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
1613 else if (r == -EROFS)
1614 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
1615 else if (r == -ENOPROTOOPT)
1616 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
1617 else if (r < 0)
1618 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
1619 else if (r > 0)
1620 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
1621 else if (r == 0)
1622 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
1623 }
1624
1625 r = fd_set_perms(i, fd, path, NULL);
1626 if (q < 0) /* prefer the quota change error from above */
1627 return q;
1628
1629 return r;
1630 }
1631
1632 static int empty_directory(Item *i, const char *path) {
1633 int r;
1634
1635 assert(i);
1636 assert(i->type == EMPTY_DIRECTORY);
1637
1638 r = is_dir(path, false);
1639 if (r == -ENOENT) {
1640 /* Option "e" operates only on existing objects. Do not
1641 * print errors about non-existent files or directories */
1642 log_debug("Skipping missing directory: %s", path);
1643 return 0;
1644 }
1645 if (r < 0)
1646 return log_error_errno(r, "is_dir() failed on path %s: %m", path);
1647 if (r == 0)
1648 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1649 "'%s' already exists and is not a directory.",
1650 path);
1651
1652 return path_set_perms(i, path);
1653 }
1654
1655 static int create_device(Item *i, mode_t file_type) {
1656 _cleanup_close_ int dfd = -1, fd = -1;
1657 CreationMode creation;
1658 char *bn;
1659 int r;
1660
1661 assert(i);
1662 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
1663
1664 bn = basename(i->path);
1665
1666 /* Validate the path and use the returned directory fd for copying the
1667 * target so we're sure that the path can't be changed behind our
1668 * back. */
1669 dfd = path_open_parent_safe(i->path);
1670 if (dfd < 0)
1671 return dfd;
1672
1673 RUN_WITH_UMASK(0000) {
1674 mac_selinux_create_file_prepare(i->path, file_type);
1675 r = mknodat(dfd, bn, i->mode | file_type, i->major_minor);
1676 mac_selinux_create_file_clear();
1677 }
1678
1679 if (r < 0) {
1680 struct stat st;
1681
1682 if (errno == EPERM) {
1683 log_debug("We lack permissions, possibly because of cgroup configuration; "
1684 "skipping creation of device node %s.", i->path);
1685 return 0;
1686 }
1687
1688 if (errno != EEXIST)
1689 return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
1690
1691 if (fstatat(dfd, bn, &st, 0) < 0)
1692 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1693
1694 if ((st.st_mode & S_IFMT) != file_type) {
1695
1696 if (i->append_or_force) {
1697
1698 RUN_WITH_UMASK(0000) {
1699 mac_selinux_create_file_prepare(i->path, file_type);
1700 /* FIXME: need to introduce mknodat_atomic() */
1701 r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
1702 mac_selinux_create_file_clear();
1703 }
1704
1705 if (r < 0)
1706 return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
1707 creation = CREATION_FORCE;
1708 } else {
1709 log_debug("%s is not a device node.", i->path);
1710 return 0;
1711 }
1712 } else
1713 creation = CREATION_EXISTING;
1714 } else
1715 creation = CREATION_NORMAL;
1716
1717 log_debug("%s %s device node \"%s\" %u:%u.",
1718 creation_mode_verb_to_string(creation),
1719 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
1720 i->path, major(i->mode), minor(i->mode));
1721
1722 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1723 if (fd < 0)
1724 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1725
1726 return fd_set_perms(i, fd, i->path, NULL);
1727 }
1728
1729 static int create_fifo(Item *i, const char *path) {
1730 _cleanup_close_ int pfd = -1, fd = -1;
1731 CreationMode creation;
1732 struct stat st;
1733 char *bn;
1734 int r;
1735
1736 pfd = path_open_parent_safe(path);
1737 if (pfd < 0)
1738 return pfd;
1739
1740 bn = basename(path);
1741
1742 RUN_WITH_UMASK(0000) {
1743 mac_selinux_create_file_prepare(path, S_IFIFO);
1744 r = mkfifoat(pfd, bn, i->mode);
1745 mac_selinux_create_file_clear();
1746 }
1747
1748 if (r < 0) {
1749 if (errno != EEXIST)
1750 return log_error_errno(errno, "Failed to create fifo %s: %m", path);
1751
1752 if (fstatat(pfd, bn, &st, AT_SYMLINK_NOFOLLOW) < 0)
1753 return log_error_errno(errno, "stat(%s) failed: %m", path);
1754
1755 if (!S_ISFIFO(st.st_mode)) {
1756
1757 if (i->append_or_force) {
1758 RUN_WITH_UMASK(0000) {
1759 mac_selinux_create_file_prepare(path, S_IFIFO);
1760 r = mkfifoat_atomic(pfd, bn, i->mode);
1761 mac_selinux_create_file_clear();
1762 }
1763
1764 if (r < 0)
1765 return log_error_errno(r, "Failed to create fifo %s: %m", path);
1766 creation = CREATION_FORCE;
1767 } else {
1768 log_warning("\"%s\" already exists and is not a fifo.", path);
1769 return 0;
1770 }
1771 } else
1772 creation = CREATION_EXISTING;
1773 } else
1774 creation = CREATION_NORMAL;
1775
1776 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), path);
1777
1778 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1779 if (fd < 0)
1780 return log_error_errno(errno, "Failed to openat(%s): %m", path);
1781
1782 return fd_set_perms(i, fd, i->path, NULL);
1783 }
1784
1785 typedef int (*action_t)(Item *i, const char *path);
1786 typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st);
1787
1788 static int item_do(Item *i, int fd, const char *path, fdaction_t action) {
1789 struct stat st;
1790 int r = 0, q;
1791
1792 assert(i);
1793 assert(path);
1794 assert(fd >= 0);
1795
1796 if (fstat(fd, &st) < 0) {
1797 r = log_error_errno(errno, "fstat() on file failed: %m");
1798 goto finish;
1799 }
1800
1801 /* This returns the first error we run into, but nevertheless
1802 * tries to go on */
1803 r = action(i, fd, path, &st);
1804
1805 if (S_ISDIR(st.st_mode)) {
1806 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1807 _cleanup_closedir_ DIR *d = NULL;
1808 struct dirent *de;
1809
1810 /* The passed 'fd' was opened with O_PATH. We need to convert
1811 * it into a 'regular' fd before reading the directory content. */
1812 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1813
1814 d = opendir(procfs_path);
1815 if (!d) {
1816 log_error_errno(errno, "Failed to opendir() '%s': %m", procfs_path);
1817 if (r == 0)
1818 r = -errno;
1819 goto finish;
1820 }
1821
1822 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
1823 int de_fd;
1824
1825 if (dot_or_dot_dot(de->d_name))
1826 continue;
1827
1828 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1829 if (de_fd < 0)
1830 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
1831 else {
1832 _cleanup_free_ char *de_path = NULL;
1833
1834 de_path = path_join(path, de->d_name);
1835 if (!de_path)
1836 q = log_oom();
1837 else
1838 /* Pass ownership of dirent fd over */
1839 q = item_do(i, de_fd, de_path, action);
1840 }
1841
1842 if (q < 0 && r == 0)
1843 r = q;
1844 }
1845 }
1846 finish:
1847 safe_close(fd);
1848 return r;
1849 }
1850
1851 static int glob_item(Item *i, action_t action) {
1852 _cleanup_globfree_ glob_t g = {
1853 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1854 };
1855 int r = 0, k;
1856 char **fn;
1857
1858 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1859 if (k < 0 && k != -ENOENT)
1860 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1861
1862 STRV_FOREACH(fn, g.gl_pathv) {
1863 k = action(i, *fn);
1864 if (k < 0 && r == 0)
1865 r = k;
1866 }
1867
1868 return r;
1869 }
1870
1871 static int glob_item_recursively(Item *i, fdaction_t action) {
1872 _cleanup_globfree_ glob_t g = {
1873 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1874 };
1875 int r = 0, k;
1876 char **fn;
1877
1878 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1879 if (k < 0 && k != -ENOENT)
1880 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1881
1882 STRV_FOREACH(fn, g.gl_pathv) {
1883 _cleanup_close_ int fd = -1;
1884
1885 /* Make sure we won't trigger/follow file object (such as
1886 * device nodes, automounts, ...) pointed out by 'fn' with
1887 * O_PATH. Note, when O_PATH is used, flags other than
1888 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
1889
1890 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
1891 if (fd < 0) {
1892 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
1893 if (r == 0)
1894 r = -errno;
1895 continue;
1896 }
1897
1898 k = item_do(i, fd, *fn, action);
1899 if (k < 0 && r == 0)
1900 r = k;
1901
1902 /* we passed fd ownership to the previous call */
1903 fd = -1;
1904 }
1905
1906 return r;
1907 }
1908
1909 static int create_item(Item *i) {
1910 CreationMode creation;
1911 int r = 0;
1912
1913 assert(i);
1914
1915 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
1916
1917 switch (i->type) {
1918
1919 case IGNORE_PATH:
1920 case IGNORE_DIRECTORY_PATH:
1921 case REMOVE_PATH:
1922 case RECURSIVE_REMOVE_PATH:
1923 return 0;
1924
1925 case TRUNCATE_FILE:
1926 case CREATE_FILE:
1927 RUN_WITH_UMASK(0000)
1928 (void) mkdir_parents_label(i->path, 0755);
1929
1930 if ((i->type == CREATE_FILE && i->append_or_force) || i->type == TRUNCATE_FILE)
1931 r = truncate_file(i, i->path);
1932 else
1933 r = create_file(i, i->path);
1934
1935 if (r < 0)
1936 return r;
1937 break;
1938
1939 case COPY_FILES:
1940 RUN_WITH_UMASK(0000)
1941 (void) mkdir_parents_label(i->path, 0755);
1942
1943 r = copy_files(i);
1944 if (r < 0)
1945 return r;
1946 break;
1947
1948 case WRITE_FILE:
1949 r = glob_item(i, write_one_file);
1950 if (r < 0)
1951 return r;
1952
1953 break;
1954
1955 case CREATE_DIRECTORY:
1956 case TRUNCATE_DIRECTORY:
1957 RUN_WITH_UMASK(0000)
1958 (void) mkdir_parents_label(i->path, 0755);
1959
1960 r = create_directory(i, i->path);
1961 if (r < 0)
1962 return r;
1963 break;
1964
1965 case CREATE_SUBVOLUME:
1966 case CREATE_SUBVOLUME_INHERIT_QUOTA:
1967 case CREATE_SUBVOLUME_NEW_QUOTA:
1968 RUN_WITH_UMASK(0000)
1969 (void) mkdir_parents_label(i->path, 0755);
1970
1971 r = create_subvolume(i, i->path);
1972 if (r < 0)
1973 return r;
1974 break;
1975
1976 case EMPTY_DIRECTORY:
1977 r = glob_item(i, empty_directory);
1978 if (r < 0)
1979 return r;
1980 break;
1981
1982 case CREATE_FIFO:
1983 RUN_WITH_UMASK(0000)
1984 (void) mkdir_parents_label(i->path, 0755);
1985
1986 r = create_fifo(i, i->path);
1987 if (r < 0)
1988 return r;
1989 break;
1990
1991 case CREATE_SYMLINK: {
1992 RUN_WITH_UMASK(0000)
1993 (void) mkdir_parents_label(i->path, 0755);
1994
1995 mac_selinux_create_file_prepare(i->path, S_IFLNK);
1996 r = symlink(i->argument, i->path);
1997 mac_selinux_create_file_clear();
1998
1999 if (r < 0) {
2000 _cleanup_free_ char *x = NULL;
2001
2002 if (errno != EEXIST)
2003 return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);
2004
2005 r = readlink_malloc(i->path, &x);
2006 if (r < 0 || !streq(i->argument, x)) {
2007
2008 if (i->append_or_force) {
2009 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2010 r = symlink_atomic(i->argument, i->path);
2011 mac_selinux_create_file_clear();
2012
2013 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2014 r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL);
2015 if (r < 0)
2016 return log_error_errno(r, "rm -fr %s failed: %m", i->path);
2017
2018 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2019 r = symlink(i->argument, i->path) < 0 ? -errno : 0;
2020 mac_selinux_create_file_clear();
2021 }
2022 if (r < 0)
2023 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2024
2025 creation = CREATION_FORCE;
2026 } else {
2027 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2028 return 0;
2029 }
2030 } else
2031 creation = CREATION_EXISTING;
2032 } else
2033
2034 creation = CREATION_NORMAL;
2035 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2036 break;
2037 }
2038
2039 case CREATE_BLOCK_DEVICE:
2040 case CREATE_CHAR_DEVICE:
2041 if (have_effective_cap(CAP_MKNOD) == 0) {
2042 /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
2043 * case to avoid noise, and we don't support virtualized devices in containers anyway. */
2044
2045 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2046 return 0;
2047 }
2048
2049 RUN_WITH_UMASK(0000)
2050 (void) mkdir_parents_label(i->path, 0755);
2051
2052 r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2053 if (r < 0)
2054 return r;
2055
2056 break;
2057
2058 case ADJUST_MODE:
2059 case RELABEL_PATH:
2060 r = glob_item(i, path_set_perms);
2061 if (r < 0)
2062 return r;
2063 break;
2064
2065 case RECURSIVE_RELABEL_PATH:
2066 r = glob_item_recursively(i, fd_set_perms);
2067 if (r < 0)
2068 return r;
2069 break;
2070
2071 case SET_XATTR:
2072 r = glob_item(i, path_set_xattrs);
2073 if (r < 0)
2074 return r;
2075 break;
2076
2077 case RECURSIVE_SET_XATTR:
2078 r = glob_item_recursively(i, fd_set_xattrs);
2079 if (r < 0)
2080 return r;
2081 break;
2082
2083 case SET_ACL:
2084 r = glob_item(i, path_set_acls);
2085 if (r < 0)
2086 return r;
2087 break;
2088
2089 case RECURSIVE_SET_ACL:
2090 r = glob_item_recursively(i, fd_set_acls);
2091 if (r < 0)
2092 return r;
2093 break;
2094
2095 case SET_ATTRIBUTE:
2096 r = glob_item(i, path_set_attribute);
2097 if (r < 0)
2098 return r;
2099 break;
2100
2101 case RECURSIVE_SET_ATTRIBUTE:
2102 r = glob_item_recursively(i, fd_set_attribute);
2103 if (r < 0)
2104 return r;
2105 break;
2106 }
2107
2108 return 0;
2109 }
2110
2111 static int remove_item_instance(Item *i, const char *instance) {
2112 int r;
2113
2114 assert(i);
2115
2116 switch (i->type) {
2117
2118 case REMOVE_PATH:
2119 if (remove(instance) < 0 && errno != ENOENT)
2120 return log_error_errno(errno, "rm(%s): %m", instance);
2121
2122 break;
2123
2124 case RECURSIVE_REMOVE_PATH:
2125 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2126 log_debug("rm -rf \"%s\"", instance);
2127 r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL);
2128 if (r < 0 && r != -ENOENT)
2129 return log_error_errno(r, "rm_rf(%s): %m", instance);
2130
2131 break;
2132
2133 default:
2134 assert_not_reached("wut?");
2135 }
2136
2137 return 0;
2138 }
2139
2140 static int remove_item(Item *i) {
2141 int r;
2142
2143 assert(i);
2144
2145 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
2146
2147 switch (i->type) {
2148
2149 case TRUNCATE_DIRECTORY:
2150 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2151 log_debug("rm -rf \"%s\"", i->path);
2152 r = rm_rf(i->path, REMOVE_PHYSICAL);
2153 if (r < 0 && r != -ENOENT)
2154 return log_error_errno(r, "rm_rf(%s): %m", i->path);
2155
2156 return 0;
2157
2158 case REMOVE_PATH:
2159 case RECURSIVE_REMOVE_PATH:
2160 return glob_item(i, remove_item_instance);
2161
2162 default:
2163 return 0;
2164 }
2165 }
2166
2167 static int clean_item_instance(Item *i, const char* instance) {
2168 _cleanup_closedir_ DIR *d = NULL;
2169 struct stat s, ps;
2170 bool mountpoint;
2171 usec_t cutoff, n;
2172 char timestamp[FORMAT_TIMESTAMP_MAX];
2173
2174 assert(i);
2175
2176 if (!i->age_set)
2177 return 0;
2178
2179 n = now(CLOCK_REALTIME);
2180 if (n < i->age)
2181 return 0;
2182
2183 cutoff = n - i->age;
2184
2185 d = opendir_nomod(instance);
2186 if (!d) {
2187 if (IN_SET(errno, ENOENT, ENOTDIR)) {
2188 log_debug_errno(errno, "Directory \"%s\": %m", instance);
2189 return 0;
2190 }
2191
2192 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
2193 }
2194
2195 if (fstat(dirfd(d), &s) < 0)
2196 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
2197
2198 if (!S_ISDIR(s.st_mode))
2199 return log_error_errno(SYNTHETIC_ERRNO(ENOTDIR),
2200 "%s is not a directory.", i->path);
2201
2202 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
2203 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
2204
2205 mountpoint = s.st_dev != ps.st_dev || s.st_ino == ps.st_ino;
2206
2207 log_debug("Cleanup threshold for %s \"%s\" is %s",
2208 mountpoint ? "mount point" : "directory",
2209 instance,
2210 format_timestamp_us(timestamp, sizeof(timestamp), cutoff));
2211
2212 return dir_cleanup(i, instance, d, &s, cutoff, s.st_dev, mountpoint,
2213 MAX_DEPTH, i->keep_first_level);
2214 }
2215
2216 static int clean_item(Item *i) {
2217 assert(i);
2218
2219 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
2220
2221 switch (i->type) {
2222 case CREATE_DIRECTORY:
2223 case CREATE_SUBVOLUME:
2224 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2225 case CREATE_SUBVOLUME_NEW_QUOTA:
2226 case TRUNCATE_DIRECTORY:
2227 case IGNORE_PATH:
2228 case COPY_FILES:
2229 clean_item_instance(i, i->path);
2230 return 0;
2231 case EMPTY_DIRECTORY:
2232 case IGNORE_DIRECTORY_PATH:
2233 return glob_item(i, clean_item_instance);
2234 default:
2235 return 0;
2236 }
2237 }
2238
2239 static int process_item(Item *i, OperationMask operation) {
2240 OperationMask todo;
2241 int r, q, p;
2242
2243 assert(i);
2244
2245 todo = operation & ~i->done;
2246 if (todo == 0) /* Everything already done? */
2247 return 0;
2248
2249 i->done |= operation;
2250
2251 r = chase_symlinks(i->path, arg_root, CHASE_NO_AUTOFS|CHASE_WARN, NULL, NULL);
2252 if (r == -EREMOTE) {
2253 log_notice_errno(r, "Skipping %s", i->path);
2254 return 0;
2255 }
2256 if (r < 0)
2257 log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
2258
2259 r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(i) : 0;
2260 /* Failure can only be tolerated for create */
2261 if (i->allow_failure)
2262 r = 0;
2263
2264 q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(i) : 0;
2265 p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(i) : 0;
2266
2267 return r < 0 ? r :
2268 q < 0 ? q :
2269 p;
2270 }
2271
2272 static int process_item_array(ItemArray *array, OperationMask operation) {
2273 int r = 0;
2274 size_t n;
2275
2276 assert(array);
2277
2278 /* Create any parent first. */
2279 if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
2280 r = process_item_array(array->parent, operation & OPERATION_CREATE);
2281
2282 /* Clean up all children first */
2283 if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) {
2284 Iterator i;
2285 ItemArray *c;
2286
2287 SET_FOREACH(c, array->children, i) {
2288 int k;
2289
2290 k = process_item_array(c, operation & (OPERATION_REMOVE|OPERATION_CLEAN));
2291 if (k < 0 && r == 0)
2292 r = k;
2293 }
2294 }
2295
2296 for (n = 0; n < array->n_items; n++) {
2297 int k;
2298
2299 k = process_item(array->items + n, operation);
2300 if (k < 0 && r == 0)
2301 r = k;
2302 }
2303
2304 return r;
2305 }
2306
2307 static void item_free_contents(Item *i) {
2308 assert(i);
2309 free(i->path);
2310 free(i->argument);
2311 strv_free(i->xattrs);
2312
2313 #if HAVE_ACL
2314 acl_free(i->acl_access);
2315 acl_free(i->acl_default);
2316 #endif
2317 }
2318
2319 static ItemArray* item_array_free(ItemArray *a) {
2320 size_t n;
2321
2322 if (!a)
2323 return NULL;
2324
2325 for (n = 0; n < a->n_items; n++)
2326 item_free_contents(a->items + n);
2327
2328 set_free(a->children);
2329 free(a->items);
2330 return mfree(a);
2331 }
2332
2333 static int item_compare(const Item *a, const Item *b) {
2334 /* Make sure that the ownership taking item is put first, so
2335 * that we first create the node, and then can adjust it */
2336
2337 if (takes_ownership(a->type) && !takes_ownership(b->type))
2338 return -1;
2339 if (!takes_ownership(a->type) && takes_ownership(b->type))
2340 return 1;
2341
2342 return CMP(a->type, b->type);
2343 }
2344
2345 static bool item_compatible(Item *a, Item *b) {
2346 assert(a);
2347 assert(b);
2348 assert(streq(a->path, b->path));
2349
2350 if (takes_ownership(a->type) && takes_ownership(b->type))
2351 /* check if the items are the same */
2352 return streq_ptr(a->argument, b->argument) &&
2353
2354 a->uid_set == b->uid_set &&
2355 a->uid == b->uid &&
2356
2357 a->gid_set == b->gid_set &&
2358 a->gid == b->gid &&
2359
2360 a->mode_set == b->mode_set &&
2361 a->mode == b->mode &&
2362
2363 a->age_set == b->age_set &&
2364 a->age == b->age &&
2365
2366 a->mask_perms == b->mask_perms &&
2367
2368 a->keep_first_level == b->keep_first_level &&
2369
2370 a->major_minor == b->major_minor;
2371
2372 return true;
2373 }
2374
2375 static bool should_include_path(const char *path) {
2376 char **prefix;
2377
2378 STRV_FOREACH(prefix, arg_exclude_prefixes)
2379 if (path_startswith(path, *prefix)) {
2380 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
2381 path, *prefix);
2382 return false;
2383 }
2384
2385 STRV_FOREACH(prefix, arg_include_prefixes)
2386 if (path_startswith(path, *prefix)) {
2387 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
2388 return true;
2389 }
2390
2391 /* no matches, so we should include this path only if we
2392 * have no whitelist at all */
2393 if (strv_isempty(arg_include_prefixes))
2394 return true;
2395
2396 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
2397 return false;
2398 }
2399
2400 static int specifier_expansion_from_arg(Item *i) {
2401 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
2402 char **xattr;
2403 int r;
2404
2405 assert(i);
2406
2407 if (!i->argument)
2408 return 0;
2409
2410 switch (i->type) {
2411 case COPY_FILES:
2412 case CREATE_SYMLINK:
2413 case CREATE_FILE:
2414 case TRUNCATE_FILE:
2415 case WRITE_FILE:
2416 r = cunescape(i->argument, 0, &unescaped);
2417 if (r < 0)
2418 return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument);
2419
2420 r = specifier_printf(unescaped, specifier_table, NULL, &resolved);
2421 if (r < 0)
2422 return r;
2423
2424 free_and_replace(i->argument, resolved);
2425 break;
2426
2427 case SET_XATTR:
2428 case RECURSIVE_SET_XATTR:
2429 assert(i->xattrs);
2430
2431 STRV_FOREACH (xattr, i->xattrs) {
2432 r = specifier_printf(*xattr, specifier_table, NULL, &resolved);
2433 if (r < 0)
2434 return r;
2435
2436 free_and_replace(*xattr, resolved);
2437 }
2438 break;
2439
2440 default:
2441 break;
2442 }
2443 return 0;
2444 }
2445
2446 static int patch_var_run(const char *fname, unsigned line, char **path) {
2447 const char *k;
2448 char *n;
2449
2450 assert(path);
2451 assert(*path);
2452
2453 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
2454 * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
2455 * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
2456 * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
2457 * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
2458 * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
2459 * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
2460 * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
2461 * the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
2462
2463 k = path_startswith(*path, "/var/run/");
2464 if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
2465 return 0;
2466
2467 n = path_join("/run", k);
2468 if (!n)
2469 return log_oom();
2470
2471 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
2472 * there's no immediate need for action by the user. However, in the interest of making things less confusing
2473 * to the user, let's still inform the user that these snippets should really be updated. */
2474 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);
2475
2476 free_and_replace(*path, n);
2477
2478 return 0;
2479 }
2480
2481 static int parse_line(const char *fname, unsigned line, const char *buffer, bool *invalid_config) {
2482
2483 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
2484 _cleanup_(item_free_contents) Item i = {};
2485 ItemArray *existing;
2486 OrderedHashmap *h;
2487 int r, pos;
2488 bool append_or_force = false, boot = false, allow_failure = false;
2489
2490 assert(fname);
2491 assert(line >= 1);
2492 assert(buffer);
2493
2494 r = extract_many_words(
2495 &buffer,
2496 NULL,
2497 EXTRACT_UNQUOTE,
2498 &action,
2499 &path,
2500 &mode,
2501 &user,
2502 &group,
2503 &age,
2504 NULL);
2505 if (r < 0) {
2506 if (IN_SET(r, -EINVAL, -EBADSLT))
2507 /* invalid quoting and such or an unknown specifier */
2508 *invalid_config = true;
2509 return log_error_errno(r, "[%s:%u] Failed to parse line: %m", fname, line);
2510 } else if (r < 2) {
2511 *invalid_config = true;
2512 log_error("[%s:%u] Syntax error.", fname, line);
2513 return -EIO;
2514 }
2515
2516 if (!empty_or_dash(buffer)) {
2517 i.argument = strdup(buffer);
2518 if (!i.argument)
2519 return log_oom();
2520 }
2521
2522 if (isempty(action)) {
2523 *invalid_config = true;
2524 log_error("[%s:%u] Command too short '%s'.", fname, line, action);
2525 return -EINVAL;
2526 }
2527
2528 for (pos = 1; action[pos]; pos++) {
2529 if (action[pos] == '!' && !boot)
2530 boot = true;
2531 else if (action[pos] == '+' && !append_or_force)
2532 append_or_force = true;
2533 else if (action[pos] == '-' && !allow_failure)
2534 allow_failure = true;
2535 else {
2536 *invalid_config = true;
2537 log_error("[%s:%u] Unknown modifiers in command '%s'",
2538 fname, line, action);
2539 return -EINVAL;
2540 }
2541 }
2542
2543 if (boot && !arg_boot) {
2544 log_debug("Ignoring entry %s \"%s\" because --boot is not specified.",
2545 action, path);
2546 return 0;
2547 }
2548
2549 i.type = action[0];
2550 i.append_or_force = append_or_force;
2551 i.allow_failure = allow_failure;
2552
2553 r = specifier_printf(path, specifier_table, NULL, &i.path);
2554 if (r == -ENXIO)
2555 return log_unresolvable_specifier(fname, line);
2556 if (r < 0) {
2557 if (IN_SET(r, -EINVAL, -EBADSLT))
2558 *invalid_config = true;
2559 return log_error_errno(r, "[%s:%u] Failed to replace specifiers: %s", fname, line, path);
2560 }
2561
2562 r = patch_var_run(fname, line, &i.path);
2563 if (r < 0)
2564 return r;
2565
2566 switch (i.type) {
2567
2568 case CREATE_DIRECTORY:
2569 case CREATE_SUBVOLUME:
2570 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2571 case CREATE_SUBVOLUME_NEW_QUOTA:
2572 case EMPTY_DIRECTORY:
2573 case TRUNCATE_DIRECTORY:
2574 case CREATE_FIFO:
2575 case IGNORE_PATH:
2576 case IGNORE_DIRECTORY_PATH:
2577 case REMOVE_PATH:
2578 case RECURSIVE_REMOVE_PATH:
2579 case ADJUST_MODE:
2580 case RELABEL_PATH:
2581 case RECURSIVE_RELABEL_PATH:
2582 if (i.argument)
2583 log_warning("[%s:%u] %c lines don't take argument fields, ignoring.", fname, line, i.type);
2584
2585 break;
2586
2587 case CREATE_FILE:
2588 case TRUNCATE_FILE:
2589 break;
2590
2591 case CREATE_SYMLINK:
2592 if (!i.argument) {
2593 i.argument = path_join("/usr/share/factory", i.path);
2594 if (!i.argument)
2595 return log_oom();
2596 }
2597 break;
2598
2599 case WRITE_FILE:
2600 if (!i.argument) {
2601 *invalid_config = true;
2602 log_error("[%s:%u] Write file requires argument.", fname, line);
2603 return -EBADMSG;
2604 }
2605 break;
2606
2607 case COPY_FILES:
2608 if (!i.argument) {
2609 i.argument = path_join(arg_root, "/usr/share/factory", i.path);
2610 if (!i.argument)
2611 return log_oom();
2612
2613 } else if (!path_is_absolute(i.argument)) {
2614 *invalid_config = true;
2615 log_error("[%s:%u] Source path is not absolute.", fname, line);
2616 return -EBADMSG;
2617
2618 } else if (arg_root) {
2619 char *p;
2620
2621 p = path_join(arg_root, i.argument);
2622 if (!p)
2623 return log_oom();
2624 free_and_replace(i.argument, p);
2625 }
2626
2627 path_simplify(i.argument, false);
2628 break;
2629
2630 case CREATE_CHAR_DEVICE:
2631 case CREATE_BLOCK_DEVICE:
2632 if (!i.argument) {
2633 *invalid_config = true;
2634 log_error("[%s:%u] Device file requires argument.", fname, line);
2635 return -EBADMSG;
2636 }
2637
2638 r = parse_dev(i.argument, &i.major_minor);
2639 if (r < 0) {
2640 *invalid_config = true;
2641 log_error_errno(r, "[%s:%u] Can't parse device file major/minor '%s'.", fname, line, i.argument);
2642 return -EBADMSG;
2643 }
2644
2645 break;
2646
2647 case SET_XATTR:
2648 case RECURSIVE_SET_XATTR:
2649 if (!i.argument) {
2650 *invalid_config = true;
2651 log_error("[%s:%u] Set extended attribute requires argument.", fname, line);
2652 return -EBADMSG;
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 log_error("[%s:%u] Set ACLs requires argument.", fname, line);
2664 return -EBADMSG;
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 log_error("[%s:%u] Set file attribute requires argument.", fname, line);
2676 return -EBADMSG;
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 log_error("[%s:%u] Unknown command type '%c'.", fname, line, (char) i.type);
2687 *invalid_config = true;
2688 return -EBADMSG;
2689 }
2690
2691 if (!path_is_absolute(i.path)) {
2692 log_error("[%s:%u] Path '%s' not absolute.", fname, line, i.path);
2693 *invalid_config = true;
2694 return -EBADMSG;
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_error_errno(r, "[%s:%u] Failed to substitute specifiers in argument: %m",
2709 fname, line);
2710 }
2711
2712 if (arg_root) {
2713 char *p;
2714
2715 p = path_join(arg_root, i.path);
2716 if (!p)
2717 return log_oom();
2718 free_and_replace(i.path, p);
2719 }
2720
2721 if (!empty_or_dash(user)) {
2722 const char *u = user;
2723
2724 r = get_user_creds(&u, &i.uid, NULL, NULL, NULL, USER_CREDS_ALLOW_MISSING);
2725 if (r < 0) {
2726 *invalid_config = true;
2727 return log_error_errno(r, "[%s:%u] Unknown user '%s'.", fname, line, user);
2728 }
2729
2730 i.uid_set = true;
2731 }
2732
2733 if (!empty_or_dash(group)) {
2734 const char *g = group;
2735
2736 r = get_group_creds(&g, &i.gid, USER_CREDS_ALLOW_MISSING);
2737 if (r < 0) {
2738 *invalid_config = true;
2739 log_error("[%s:%u] Unknown group '%s'.", fname, line, group);
2740 return r;
2741 }
2742
2743 i.gid_set = true;
2744 }
2745
2746 if (!empty_or_dash(mode)) {
2747 const char *mm = mode;
2748 unsigned m;
2749
2750 if (*mm == '~') {
2751 i.mask_perms = true;
2752 mm++;
2753 }
2754
2755 if (parse_mode(mm, &m) < 0) {
2756 *invalid_config = true;
2757 log_error("[%s:%u] Invalid mode '%s'.", fname, line, mode);
2758 return -EBADMSG;
2759 }
2760
2761 i.mode = m;
2762 i.mode_set = true;
2763 } else
2764 i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
2765
2766 if (!empty_or_dash(age)) {
2767 const char *a = age;
2768
2769 if (*a == '~') {
2770 i.keep_first_level = true;
2771 a++;
2772 }
2773
2774 if (parse_sec(a, &i.age) < 0) {
2775 *invalid_config = true;
2776 log_error("[%s:%u] Invalid age '%s'.", fname, line, age);
2777 return -EBADMSG;
2778 }
2779
2780 i.age_set = true;
2781 }
2782
2783 h = needs_glob(i.type) ? globs : items;
2784
2785 existing = ordered_hashmap_get(h, i.path);
2786 if (existing) {
2787 size_t n;
2788
2789 for (n = 0; n < existing->n_items; n++) {
2790 if (!item_compatible(existing->items + n, &i) && !i.append_or_force) {
2791 log_notice("[%s:%u] Duplicate line for path \"%s\", ignoring.",
2792 fname, line, i.path);
2793 return 0;
2794 }
2795 }
2796 } else {
2797 existing = new0(ItemArray, 1);
2798 if (!existing)
2799 return log_oom();
2800
2801 r = ordered_hashmap_put(h, i.path, existing);
2802 if (r < 0) {
2803 free(existing);
2804 return log_oom();
2805 }
2806 }
2807
2808 if (!GREEDY_REALLOC(existing->items, existing->allocated, existing->n_items + 1))
2809 return log_oom();
2810
2811 existing->items[existing->n_items++] = i;
2812 i = (struct Item) {};
2813
2814 /* Sort item array, to enforce stable ordering of application */
2815 typesafe_qsort(existing->items, existing->n_items, item_compare);
2816
2817 return 0;
2818 }
2819
2820 static int cat_config(char **config_dirs, char **args) {
2821 _cleanup_strv_free_ char **files = NULL;
2822 int r;
2823
2824 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
2825 if (r < 0)
2826 return r;
2827
2828 return cat_files(NULL, files, 0);
2829 }
2830
2831 static int help(void) {
2832 _cleanup_free_ char *link = NULL;
2833 int r;
2834
2835 r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
2836 if (r < 0)
2837 return log_oom();
2838
2839 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
2840 "Creates, deletes and cleans up volatile and temporary files and directories.\n\n"
2841 " -h --help Show this help\n"
2842 " --user Execute user configuration\n"
2843 " --version Show package version\n"
2844 " --cat-config Show configuration files\n"
2845 " --create Create marked files/directories\n"
2846 " --clean Clean up marked directories\n"
2847 " --remove Remove marked files/directories\n"
2848 " --boot Execute actions only safe at boot\n"
2849 " --prefix=PATH Only apply rules with the specified prefix\n"
2850 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
2851 " --root=PATH Operate on an alternate filesystem root\n"
2852 " --replace=PATH Treat arguments as replacement for PATH\n"
2853 " --no-pager Do not pipe output into a pager\n"
2854 "\nSee the %s for details.\n"
2855 , program_invocation_short_name
2856 , link
2857 );
2858
2859 return 0;
2860 }
2861
2862 static int parse_argv(int argc, char *argv[]) {
2863
2864 enum {
2865 ARG_VERSION = 0x100,
2866 ARG_CAT_CONFIG,
2867 ARG_USER,
2868 ARG_CREATE,
2869 ARG_CLEAN,
2870 ARG_REMOVE,
2871 ARG_BOOT,
2872 ARG_PREFIX,
2873 ARG_EXCLUDE_PREFIX,
2874 ARG_ROOT,
2875 ARG_REPLACE,
2876 ARG_NO_PAGER,
2877 };
2878
2879 static const struct option options[] = {
2880 { "help", no_argument, NULL, 'h' },
2881 { "user", no_argument, NULL, ARG_USER },
2882 { "version", no_argument, NULL, ARG_VERSION },
2883 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
2884 { "create", no_argument, NULL, ARG_CREATE },
2885 { "clean", no_argument, NULL, ARG_CLEAN },
2886 { "remove", no_argument, NULL, ARG_REMOVE },
2887 { "boot", no_argument, NULL, ARG_BOOT },
2888 { "prefix", required_argument, NULL, ARG_PREFIX },
2889 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
2890 { "root", required_argument, NULL, ARG_ROOT },
2891 { "replace", required_argument, NULL, ARG_REPLACE },
2892 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
2893 {}
2894 };
2895
2896 int c, r;
2897
2898 assert(argc >= 0);
2899 assert(argv);
2900
2901 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
2902
2903 switch (c) {
2904
2905 case 'h':
2906 return help();
2907
2908 case ARG_VERSION:
2909 return version();
2910
2911 case ARG_CAT_CONFIG:
2912 arg_cat_config = true;
2913 break;
2914
2915 case ARG_USER:
2916 arg_user = true;
2917 break;
2918
2919 case ARG_CREATE:
2920 arg_operation |= OPERATION_CREATE;
2921 break;
2922
2923 case ARG_CLEAN:
2924 arg_operation |= OPERATION_CLEAN;
2925 break;
2926
2927 case ARG_REMOVE:
2928 arg_operation |= OPERATION_REMOVE;
2929 break;
2930
2931 case ARG_BOOT:
2932 arg_boot = true;
2933 break;
2934
2935 case ARG_PREFIX:
2936 if (strv_push(&arg_include_prefixes, optarg) < 0)
2937 return log_oom();
2938 break;
2939
2940 case ARG_EXCLUDE_PREFIX:
2941 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
2942 return log_oom();
2943 break;
2944
2945 case ARG_ROOT:
2946 r = parse_path_argument_and_warn(optarg, true, &arg_root);
2947 if (r < 0)
2948 return r;
2949 break;
2950
2951 case ARG_REPLACE:
2952 if (!path_is_absolute(optarg) ||
2953 !endswith(optarg, ".conf"))
2954 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2955 "The argument to --replace= must an absolute path to a config file");
2956
2957 arg_replace = optarg;
2958 break;
2959
2960 case ARG_NO_PAGER:
2961 arg_pager_flags |= PAGER_DISABLE;
2962 break;
2963
2964 case '?':
2965 return -EINVAL;
2966
2967 default:
2968 assert_not_reached("Unhandled option");
2969 }
2970
2971 if (arg_operation == 0 && !arg_cat_config)
2972 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2973 "You need to specify at least one of --clean, --create or --remove.");
2974
2975 if (arg_replace && arg_cat_config)
2976 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2977 "Option --replace= is not supported with --cat-config");
2978
2979 if (arg_replace && optind >= argc)
2980 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2981 "When --replace= is given, some configuration items must be specified");
2982
2983 return 1;
2984 }
2985
2986 static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) {
2987 _cleanup_fclose_ FILE *_f = NULL;
2988 Iterator iterator;
2989 unsigned v = 0;
2990 FILE *f;
2991 Item *i;
2992 int r = 0;
2993
2994 assert(fn);
2995
2996 if (streq(fn, "-")) {
2997 log_debug("Reading config from stdin…");
2998 fn = "<stdin>";
2999 f = stdin;
3000 } else {
3001 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f);
3002 if (r < 0) {
3003 if (ignore_enoent && r == -ENOENT) {
3004 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
3005 return 0;
3006 }
3007
3008 return log_error_errno(r, "Failed to open '%s': %m", fn);
3009 }
3010 log_debug("Reading config file \"%s\"…", fn);
3011 f = _f;
3012 }
3013
3014 for (;;) {
3015 _cleanup_free_ char *line = NULL;
3016 bool invalid_line = false;
3017 char *l;
3018 int k;
3019
3020 k = read_line(f, LONG_LINE_MAX, &line);
3021 if (k < 0)
3022 return log_error_errno(k, "Failed to read '%s': %m", fn);
3023 if (k == 0)
3024 break;
3025
3026 v++;
3027
3028 l = strstrip(line);
3029 if (IN_SET(*l, 0, '#'))
3030 continue;
3031
3032 k = parse_line(fn, v, l, &invalid_line);
3033 if (k < 0) {
3034 if (invalid_line)
3035 /* Allow reporting with a special code if the caller requested this */
3036 *invalid_config = true;
3037 else if (r == 0)
3038 /* The first error becomes our return value */
3039 r = k;
3040 }
3041 }
3042
3043 /* we have to determine age parameter for each entry of type X */
3044 ORDERED_HASHMAP_FOREACH(i, globs, iterator) {
3045 Iterator iter;
3046 Item *j, *candidate_item = NULL;
3047
3048 if (i->type != IGNORE_DIRECTORY_PATH)
3049 continue;
3050
3051 ORDERED_HASHMAP_FOREACH(j, items, iter) {
3052 if (!IN_SET(j->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA))
3053 continue;
3054
3055 if (path_equal(j->path, i->path)) {
3056 candidate_item = j;
3057 break;
3058 }
3059
3060 if ((!candidate_item && path_startswith(i->path, j->path)) ||
3061 (candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)))
3062 candidate_item = j;
3063 }
3064
3065 if (candidate_item && candidate_item->age_set) {
3066 i->age = candidate_item->age;
3067 i->age_set = true;
3068 }
3069 }
3070
3071 if (ferror(f)) {
3072 log_error_errno(errno, "Failed to read from file %s: %m", fn);
3073 if (r == 0)
3074 r = -EIO;
3075 }
3076
3077 return r;
3078 }
3079
3080 static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
3081 char **arg;
3082 int r;
3083
3084 STRV_FOREACH(arg, args) {
3085 r = read_config_file(config_dirs, *arg, false, invalid_config);
3086 if (r < 0)
3087 return r;
3088 }
3089
3090 return 0;
3091 }
3092
3093 static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
3094 _cleanup_strv_free_ char **files = NULL;
3095 _cleanup_free_ char *p = NULL;
3096 char **f;
3097 int r;
3098
3099 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
3100 if (r < 0)
3101 return r;
3102
3103 STRV_FOREACH(f, files)
3104 if (p && path_equal(*f, p)) {
3105 log_debug("Parsing arguments at position \"%s\"…", *f);
3106
3107 r = parse_arguments(config_dirs, args, invalid_config);
3108 if (r < 0)
3109 return r;
3110 } else
3111 /* Just warn, ignore result otherwise.
3112 * read_config_file() has some debug output, so no need to print anything. */
3113 (void) read_config_file(config_dirs, *f, true, invalid_config);
3114
3115 return 0;
3116 }
3117
3118 static int link_parent(ItemArray *a) {
3119 const char *path;
3120 char *prefix;
3121 int r;
3122
3123 assert(a);
3124
3125 /* Finds the closest "parent" item array for the specified item array. Then registers the specified item array
3126 * as child of it, and fills the parent in, linking them both ways. This allows us to later create parents
3127 * before their children, and clean up/remove children before their parents. */
3128
3129 if (a->n_items <= 0)
3130 return 0;
3131
3132 path = a->items[0].path;
3133 prefix = newa(char, strlen(path) + 1);
3134 PATH_FOREACH_PREFIX(prefix, path) {
3135 ItemArray *j;
3136
3137 j = ordered_hashmap_get(items, prefix);
3138 if (!j)
3139 j = ordered_hashmap_get(globs, prefix);
3140 if (j) {
3141 r = set_ensure_allocated(&j->children, NULL);
3142 if (r < 0)
3143 return log_oom();
3144
3145 r = set_put(j->children, a);
3146 if (r < 0)
3147 return log_oom();
3148
3149 a->parent = j;
3150 return 1;
3151 }
3152 }
3153
3154 return 0;
3155 }
3156
3157 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
3158 ItemArray, item_array_free);
3159
3160 static int run(int argc, char *argv[]) {
3161 _cleanup_strv_free_ char **config_dirs = NULL;
3162 bool invalid_config = false;
3163 Iterator iterator;
3164 ItemArray *a;
3165 enum {
3166 PHASE_REMOVE_AND_CLEAN,
3167 PHASE_CREATE,
3168 _PHASE_MAX
3169 } phase;
3170 int r, k;
3171
3172 r = parse_argv(argc, argv);
3173 if (r <= 0)
3174 return r;
3175
3176 log_setup_service();
3177
3178 /* Descending down file system trees might take a lot of fds */
3179 (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
3180
3181 if (arg_user) {
3182 r = user_config_paths(&config_dirs);
3183 if (r < 0)
3184 return log_error_errno(r, "Failed to initialize configuration directory list: %m");
3185 } else {
3186 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
3187 if (!config_dirs)
3188 return log_oom();
3189 }
3190
3191 if (DEBUG_LOGGING) {
3192 _cleanup_free_ char *t = NULL;
3193
3194 t = strv_join(config_dirs, "\n\t");
3195 if (t)
3196 log_debug("Looking for configuration files in (higher priority first):\n\t%s", t);
3197 }
3198
3199 if (arg_cat_config) {
3200 (void) pager_open(arg_pager_flags);
3201
3202 return cat_config(config_dirs, argv + optind);
3203 }
3204
3205 umask(0022);
3206
3207 mac_selinux_init();
3208
3209 items = ordered_hashmap_new(&item_array_hash_ops);
3210 globs = ordered_hashmap_new(&item_array_hash_ops);
3211 if (!items || !globs)
3212 return log_oom();
3213
3214 /* If command line arguments are specified along with --replace, read all
3215 * configuration files and insert the positional arguments at the specified
3216 * place. Otherwise, if command line arguments are specified, execute just
3217 * them, and finally, without --replace= or any positional arguments, just
3218 * read configuration and execute it.
3219 */
3220 if (arg_replace || optind >= argc)
3221 r = read_config_files(config_dirs, argv + optind, &invalid_config);
3222 else
3223 r = parse_arguments(config_dirs, argv + optind, &invalid_config);
3224 if (r < 0)
3225 return r;
3226
3227 /* Let's now link up all child/parent relationships */
3228 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3229 r = link_parent(a);
3230 if (r < 0)
3231 return r;
3232 }
3233 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3234 r = link_parent(a);
3235 if (r < 0)
3236 return r;
3237 }
3238
3239 /* If multiple operations are requested, let's first run the remove/clean operations, and only then the create
3240 * operations. i.e. that we first clean out the platform we then build on. */
3241 for (phase = 0; phase < _PHASE_MAX; phase++) {
3242 OperationMask op;
3243
3244 if (phase == PHASE_REMOVE_AND_CLEAN)
3245 op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
3246 else if (phase == PHASE_CREATE)
3247 op = arg_operation & OPERATION_CREATE;
3248 else
3249 assert_not_reached("unexpected phase");
3250
3251 if (op == 0) /* Nothing requested in this phase */
3252 continue;
3253
3254 /* The non-globbing ones usually create things, hence we apply them first */
3255 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3256 k = process_item_array(a, op);
3257 if (k < 0 && r >= 0)
3258 r = k;
3259 }
3260
3261 /* The globbing ones usually alter things, hence we apply them second. */
3262 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3263 k = process_item_array(a, op);
3264 if (k < 0 && r >= 0)
3265 r = k;
3266 }
3267 }
3268
3269 if (ERRNO_IS_RESOURCE(-r))
3270 return r;
3271 if (invalid_config)
3272 return EX_DATAERR;
3273 if (r < 0)
3274 return EX_CANTCREAT;
3275 return 0;
3276 }
3277
3278 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
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