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tree-wide: hook up image dissection policy logic everywhere
[thirdparty/systemd.git] / src / tmpfiles / tmpfiles.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
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 "build.h"
24 #include "capability-util.h"
25 #include "chase.h"
26 #include "chattr-util.h"
27 #include "conf-files.h"
28 #include "constants.h"
29 #include "copy.h"
30 #include "creds-util.h"
31 #include "devnum-util.h"
32 #include "dirent-util.h"
33 #include "dissect-image.h"
34 #include "env-util.h"
35 #include "errno-util.h"
36 #include "escape.h"
37 #include "fd-util.h"
38 #include "fileio.h"
39 #include "format-util.h"
40 #include "fs-util.h"
41 #include "glob-util.h"
42 #include "hexdecoct.h"
43 #include "io-util.h"
44 #include "label.h"
45 #include "log.h"
46 #include "macro.h"
47 #include "main-func.h"
48 #include "missing_stat.h"
49 #include "missing_syscall.h"
50 #include "mkdir-label.h"
51 #include "mount-util.h"
52 #include "mountpoint-util.h"
53 #include "nulstr-util.h"
54 #include "offline-passwd.h"
55 #include "pager.h"
56 #include "parse-argument.h"
57 #include "parse-util.h"
58 #include "path-lookup.h"
59 #include "path-util.h"
60 #include "pretty-print.h"
61 #include "rlimit-util.h"
62 #include "rm-rf.h"
63 #include "selinux-util.h"
64 #include "set.h"
65 #include "sort-util.h"
66 #include "specifier.h"
67 #include "stdio-util.h"
68 #include "string-table.h"
69 #include "string-util.h"
70 #include "strv.h"
71 #include "terminal-util.h"
72 #include "umask-util.h"
73 #include "user-util.h"
74 #include "virt.h"
75
76 /* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
77 * them in the file system. This is intended to be used to create
78 * properly owned directories beneath /tmp, /var/tmp, /run, which are
79 * volatile and hence need to be recreated on bootup. */
80
81 typedef enum OperationMask {
82 OPERATION_CREATE = 1 << 0,
83 OPERATION_REMOVE = 1 << 1,
84 OPERATION_CLEAN = 1 << 2,
85 } OperationMask;
86
87 typedef enum ItemType {
88 /* These ones take file names */
89 CREATE_FILE = 'f',
90 TRUNCATE_FILE = 'F', /* deprecated: use f+ */
91 CREATE_DIRECTORY = 'd',
92 TRUNCATE_DIRECTORY = 'D',
93 CREATE_SUBVOLUME = 'v',
94 CREATE_SUBVOLUME_INHERIT_QUOTA = 'q',
95 CREATE_SUBVOLUME_NEW_QUOTA = 'Q',
96 CREATE_FIFO = 'p',
97 CREATE_SYMLINK = 'L',
98 CREATE_CHAR_DEVICE = 'c',
99 CREATE_BLOCK_DEVICE = 'b',
100 COPY_FILES = 'C',
101
102 /* These ones take globs */
103 WRITE_FILE = 'w',
104 EMPTY_DIRECTORY = 'e',
105 SET_XATTR = 't',
106 RECURSIVE_SET_XATTR = 'T',
107 SET_ACL = 'a',
108 RECURSIVE_SET_ACL = 'A',
109 SET_ATTRIBUTE = 'h',
110 RECURSIVE_SET_ATTRIBUTE = 'H',
111 IGNORE_PATH = 'x',
112 IGNORE_DIRECTORY_PATH = 'X',
113 REMOVE_PATH = 'r',
114 RECURSIVE_REMOVE_PATH = 'R',
115 RELABEL_PATH = 'z',
116 RECURSIVE_RELABEL_PATH = 'Z',
117 ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
118 } ItemType;
119
120 typedef enum AgeBy {
121 AGE_BY_ATIME = 1 << 0,
122 AGE_BY_BTIME = 1 << 1,
123 AGE_BY_CTIME = 1 << 2,
124 AGE_BY_MTIME = 1 << 3,
125
126 /* All file timestamp types are checked by default. */
127 AGE_BY_DEFAULT_FILE = AGE_BY_ATIME | AGE_BY_BTIME | AGE_BY_CTIME | AGE_BY_MTIME,
128 AGE_BY_DEFAULT_DIR = AGE_BY_ATIME | AGE_BY_BTIME | AGE_BY_MTIME
129 } AgeBy;
130
131 typedef struct Item {
132 ItemType type;
133
134 char *path;
135 char *argument;
136 void *binary_argument; /* set if binary data, in which case it takes precedence over 'argument' */
137 size_t binary_argument_size;
138 char **xattrs;
139 #if HAVE_ACL
140 acl_t acl_access;
141 acl_t acl_default;
142 #endif
143 uid_t uid;
144 gid_t gid;
145 mode_t mode;
146 usec_t age;
147 AgeBy age_by_file, age_by_dir;
148
149 dev_t major_minor;
150 unsigned attribute_value;
151 unsigned attribute_mask;
152
153 bool uid_set:1;
154 bool gid_set:1;
155 bool mode_set:1;
156 bool uid_only_create:1;
157 bool gid_only_create:1;
158 bool mode_only_create:1;
159 bool age_set:1;
160 bool mask_perms:1;
161 bool attribute_set:1;
162
163 bool keep_first_level:1;
164
165 bool append_or_force:1;
166
167 bool allow_failure:1;
168
169 bool try_replace:1;
170
171 OperationMask done;
172 } Item;
173
174 typedef struct ItemArray {
175 Item *items;
176 size_t n_items;
177
178 struct ItemArray *parent;
179 Set *children;
180 } ItemArray;
181
182 typedef enum DirectoryType {
183 DIRECTORY_RUNTIME,
184 DIRECTORY_STATE,
185 DIRECTORY_CACHE,
186 DIRECTORY_LOGS,
187 _DIRECTORY_TYPE_MAX,
188 } DirectoryType;
189
190 typedef enum {
191 CREATION_NORMAL,
192 CREATION_EXISTING,
193 CREATION_FORCE,
194 _CREATION_MODE_MAX,
195 _CREATION_MODE_INVALID = -EINVAL,
196 } CreationMode;
197
198 static bool arg_cat_config = false;
199 static RuntimeScope arg_runtime_scope = RUNTIME_SCOPE_SYSTEM;
200 static OperationMask arg_operation = 0;
201 static bool arg_boot = false;
202 static PagerFlags arg_pager_flags = 0;
203
204 static char **arg_include_prefixes = NULL;
205 static char **arg_exclude_prefixes = NULL;
206 static char *arg_root = NULL;
207 static char *arg_image = NULL;
208 static char *arg_replace = NULL;
209 static ImagePolicy *arg_image_policy = NULL;
210
211 #define MAX_DEPTH 256
212
213 static OrderedHashmap *items = NULL, *globs = NULL;
214 static Set *unix_sockets = NULL;
215
216 STATIC_DESTRUCTOR_REGISTER(items, ordered_hashmap_freep);
217 STATIC_DESTRUCTOR_REGISTER(globs, ordered_hashmap_freep);
218 STATIC_DESTRUCTOR_REGISTER(unix_sockets, set_freep);
219 STATIC_DESTRUCTOR_REGISTER(arg_include_prefixes, freep);
220 STATIC_DESTRUCTOR_REGISTER(arg_exclude_prefixes, freep);
221 STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
222 STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
223 STATIC_DESTRUCTOR_REGISTER(arg_image_policy, image_policy_freep);
224
225 static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = {
226 [CREATION_NORMAL] = "Created",
227 [CREATION_EXISTING] = "Found existing",
228 [CREATION_FORCE] = "Created replacement",
229 };
230
231 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
232
233 /* Different kinds of errors that mean that information is not available in the environment. */
234 static inline bool ERRNO_IS_NOINFO(int r) {
235 return IN_SET(abs(r),
236 EUNATCH, /* os-release or machine-id missing */
237 ENOMEDIUM, /* machine-id or another file empty */
238 ENXIO); /* env var is unset */
239 }
240
241 static int specifier_directory(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
242 struct table_entry {
243 uint64_t type;
244 const char *suffix;
245 };
246
247 static const struct table_entry paths_system[] = {
248 [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
249 [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
250 [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
251 [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
252 };
253
254 static const struct table_entry paths_user[] = {
255 [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
256 [DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION },
257 [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
258 [DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
259 };
260
261 const struct table_entry *paths;
262 _cleanup_free_ char *p = NULL;
263 unsigned i;
264 int r;
265
266 assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
267 paths = arg_runtime_scope == RUNTIME_SCOPE_USER ? paths_user : paths_system;
268
269 i = PTR_TO_UINT(data);
270 assert(i < ELEMENTSOF(paths_system));
271
272 r = sd_path_lookup(paths[i].type, paths[i].suffix, &p);
273 if (r < 0)
274 return r;
275
276 if (arg_root) {
277 _cleanup_free_ char *j = NULL;
278
279 j = path_join(arg_root, p);
280 if (!j)
281 return -ENOMEM;
282
283 *ret = TAKE_PTR(j);
284 } else
285 *ret = TAKE_PTR(p);
286
287 return 0;
288 }
289
290 static int log_unresolvable_specifier(const char *filename, unsigned line) {
291 static bool notified = false;
292
293 /* In system mode, this is called when /etc is not fully initialized and some specifiers are
294 * unresolvable. In user mode, this is called when some variables are not defined. These cases are
295 * not considered a fatal error, so log at LOG_NOTICE only for the first time and then downgrade this
296 * to LOG_DEBUG for the rest.
297 *
298 * If we're running in a chroot (--root was used or sd_booted() reports that systemd is not running),
299 * always use LOG_DEBUG. We may be called to initialize a chroot before booting and there is no
300 * expectation that machine-id and other files will be populated.
301 */
302
303 int log_level = notified || arg_root || running_in_chroot() > 0 ?
304 LOG_DEBUG : LOG_NOTICE;
305
306 log_syntax(NULL,
307 log_level,
308 filename, line, 0,
309 "Failed to resolve specifier: %s, skipping.",
310 arg_runtime_scope == RUNTIME_SCOPE_USER ? "Required $XDG_... variable not defined" : "uninitialized /etc/ detected");
311
312 if (!notified)
313 log_full(log_level,
314 "All rules containing unresolvable specifiers will be skipped.");
315
316 notified = true;
317 return 0;
318 }
319
320 static int user_config_paths(char*** ret) {
321 _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
322 _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
323 _cleanup_strv_free_ char **res = NULL;
324 int r;
325
326 r = xdg_user_dirs(&config_dirs, &data_dirs);
327 if (r < 0)
328 return r;
329
330 r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
331 if (r < 0 && !ERRNO_IS_NOINFO(r))
332 return r;
333
334 r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
335 if (r < 0 && !ERRNO_IS_NOINFO(r))
336 return r;
337
338 r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
339 if (r < 0 && !ERRNO_IS_NOINFO(r))
340 return r;
341
342 r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
343 if (r < 0)
344 return r;
345
346 r = strv_extend(&res, persistent_config);
347 if (r < 0)
348 return r;
349
350 r = strv_extend(&res, runtime_config);
351 if (r < 0)
352 return r;
353
354 r = strv_extend(&res, data_home);
355 if (r < 0)
356 return r;
357
358 r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
359 if (r < 0)
360 return r;
361
362 r = path_strv_make_absolute_cwd(res);
363 if (r < 0)
364 return r;
365
366 *ret = TAKE_PTR(res);
367 return 0;
368 }
369
370 static bool needs_glob(ItemType t) {
371 return IN_SET(t,
372 WRITE_FILE,
373 IGNORE_PATH,
374 IGNORE_DIRECTORY_PATH,
375 REMOVE_PATH,
376 RECURSIVE_REMOVE_PATH,
377 EMPTY_DIRECTORY,
378 ADJUST_MODE,
379 RELABEL_PATH,
380 RECURSIVE_RELABEL_PATH,
381 SET_XATTR,
382 RECURSIVE_SET_XATTR,
383 SET_ACL,
384 RECURSIVE_SET_ACL,
385 SET_ATTRIBUTE,
386 RECURSIVE_SET_ATTRIBUTE);
387 }
388
389 static bool takes_ownership(ItemType t) {
390 return IN_SET(t,
391 CREATE_FILE,
392 TRUNCATE_FILE,
393 CREATE_DIRECTORY,
394 EMPTY_DIRECTORY,
395 TRUNCATE_DIRECTORY,
396 CREATE_SUBVOLUME,
397 CREATE_SUBVOLUME_INHERIT_QUOTA,
398 CREATE_SUBVOLUME_NEW_QUOTA,
399 CREATE_FIFO,
400 CREATE_SYMLINK,
401 CREATE_CHAR_DEVICE,
402 CREATE_BLOCK_DEVICE,
403 COPY_FILES,
404 WRITE_FILE,
405 IGNORE_PATH,
406 IGNORE_DIRECTORY_PATH,
407 REMOVE_PATH,
408 RECURSIVE_REMOVE_PATH);
409 }
410
411 static struct Item* find_glob(OrderedHashmap *h, const char *match) {
412 ItemArray *j;
413
414 ORDERED_HASHMAP_FOREACH(j, h) {
415 size_t n;
416
417 for (n = 0; n < j->n_items; n++) {
418 Item *item = j->items + n;
419
420 if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
421 return item;
422 }
423 }
424
425 return NULL;
426 }
427
428 static int load_unix_sockets(void) {
429 _cleanup_set_free_ Set *sockets = NULL;
430 _cleanup_fclose_ FILE *f = NULL;
431 int r;
432
433 if (unix_sockets)
434 return 0;
435
436 /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
437
438 f = fopen("/proc/net/unix", "re");
439 if (!f)
440 return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
441 "Failed to open /proc/net/unix, ignoring: %m");
442
443 /* Skip header */
444 r = read_line(f, LONG_LINE_MAX, NULL);
445 if (r < 0)
446 return log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
447 if (r == 0)
448 return log_warning_errno(SYNTHETIC_ERRNO(EIO), "Premature end of file reading /proc/net/unix.");
449
450 for (;;) {
451 _cleanup_free_ char *line = NULL;
452 char *p;
453
454 r = read_line(f, LONG_LINE_MAX, &line);
455 if (r < 0)
456 return log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
457 if (r == 0) /* EOF */
458 break;
459
460 p = strchr(line, ':');
461 if (!p)
462 continue;
463
464 if (strlen(p) < 37)
465 continue;
466
467 p += 37;
468 p += strspn(p, WHITESPACE);
469 p += strcspn(p, WHITESPACE); /* skip one more word */
470 p += strspn(p, WHITESPACE);
471
472 if (!path_is_absolute(p))
473 continue;
474
475 r = set_put_strdup_full(&sockets, &path_hash_ops_free, p);
476 if (r < 0)
477 return log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
478 }
479
480 unix_sockets = TAKE_PTR(sockets);
481 return 1;
482 }
483
484 static bool unix_socket_alive(const char *fn) {
485 assert(fn);
486
487 if (load_unix_sockets() < 0)
488 return true; /* We don't know, so assume yes */
489
490 return set_contains(unix_sockets, fn);
491 }
492
493 /* Accessors for the argument in binary format */
494 static const void* item_binary_argument(const Item *i) {
495 assert(i);
496 return i->binary_argument ?: i->argument;
497 }
498
499 static size_t item_binary_argument_size(const Item *i) {
500 assert(i);
501 return i->binary_argument ? i->binary_argument_size : strlen_ptr(i->argument);
502 }
503
504 static DIR* xopendirat_nomod(int dirfd, const char *path) {
505 DIR *dir;
506
507 dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
508 if (dir)
509 return dir;
510
511 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
512 if (errno != EPERM)
513 return NULL;
514
515 dir = xopendirat(dirfd, path, O_NOFOLLOW);
516 if (!dir)
517 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
518
519 return dir;
520 }
521
522 static DIR* opendir_nomod(const char *path) {
523 return xopendirat_nomod(AT_FDCWD, path);
524 }
525
526 static inline nsec_t load_statx_timestamp_nsec(const struct statx_timestamp *ts) {
527 assert(ts);
528
529 if (ts->tv_sec < 0)
530 return NSEC_INFINITY;
531
532 if ((nsec_t) ts->tv_sec >= (UINT64_MAX - ts->tv_nsec) / NSEC_PER_SEC)
533 return NSEC_INFINITY;
534
535 return ts->tv_sec * NSEC_PER_SEC + ts->tv_nsec;
536 }
537
538 static bool needs_cleanup(
539 nsec_t atime,
540 nsec_t btime,
541 nsec_t ctime,
542 nsec_t mtime,
543 nsec_t cutoff,
544 const char *sub_path,
545 AgeBy age_by,
546 bool is_dir) {
547
548 if (FLAGS_SET(age_by, AGE_BY_MTIME) && mtime != NSEC_INFINITY && mtime >= cutoff) {
549 /* Follows spelling in stat(1). */
550 log_debug("%s \"%s\": modify time %s is too new.",
551 is_dir ? "Directory" : "File",
552 sub_path,
553 FORMAT_TIMESTAMP_STYLE(mtime / NSEC_PER_USEC, TIMESTAMP_US));
554
555 return false;
556 }
557
558 if (FLAGS_SET(age_by, AGE_BY_ATIME) && atime != NSEC_INFINITY && atime >= cutoff) {
559 log_debug("%s \"%s\": access time %s is too new.",
560 is_dir ? "Directory" : "File",
561 sub_path,
562 FORMAT_TIMESTAMP_STYLE(atime / NSEC_PER_USEC, TIMESTAMP_US));
563
564 return false;
565 }
566
567 /*
568 * Note: Unless explicitly specified by the user, "ctime" is ignored
569 * by default for directories, because we change it when deleting.
570 */
571 if (FLAGS_SET(age_by, AGE_BY_CTIME) && ctime != NSEC_INFINITY && ctime >= cutoff) {
572 log_debug("%s \"%s\": change time %s is too new.",
573 is_dir ? "Directory" : "File",
574 sub_path,
575 FORMAT_TIMESTAMP_STYLE(ctime / NSEC_PER_USEC, TIMESTAMP_US));
576
577 return false;
578 }
579
580 if (FLAGS_SET(age_by, AGE_BY_BTIME) && btime != NSEC_INFINITY && btime >= cutoff) {
581 log_debug("%s \"%s\": birth time %s is too new.",
582 is_dir ? "Directory" : "File",
583 sub_path,
584 FORMAT_TIMESTAMP_STYLE(btime / NSEC_PER_USEC, TIMESTAMP_US));
585
586 return false;
587 }
588
589 return true;
590 }
591
592 static int dir_cleanup(
593 Item *i,
594 const char *p,
595 DIR *d,
596 nsec_t self_atime_nsec,
597 nsec_t self_mtime_nsec,
598 nsec_t cutoff_nsec,
599 dev_t rootdev_major,
600 dev_t rootdev_minor,
601 bool mountpoint,
602 int maxdepth,
603 bool keep_this_level,
604 AgeBy age_by_file,
605 AgeBy age_by_dir) {
606
607 bool deleted = false;
608 int r = 0;
609
610 FOREACH_DIRENT_ALL(de, d, break) {
611 _cleanup_free_ char *sub_path = NULL;
612 nsec_t atime_nsec, mtime_nsec, ctime_nsec, btime_nsec;
613
614 if (dot_or_dot_dot(de->d_name))
615 continue;
616
617 /* If statx() is supported, use it. It's preferable over fstatat() since it tells us
618 * explicitly where we are looking at a mount point, for free as side information. Determining
619 * the same information without statx() is hard, see the complexity of path_is_mount_point(),
620 * and also much slower as it requires a number of syscalls instead of just one. Hence, when
621 * we have modern statx() we use it instead of fstat() and do proper mount point checks,
622 * while on older kernels's well do traditional st_dev based detection of mount points.
623 *
624 * Using statx() for detecting mount points also has the benfit that we handle weird file
625 * systems such as overlayfs better where each file is originating from a different
626 * st_dev. */
627
628 STRUCT_STATX_DEFINE(sx);
629
630 r = statx_fallback(
631 dirfd(d), de->d_name,
632 AT_SYMLINK_NOFOLLOW|AT_NO_AUTOMOUNT,
633 STATX_TYPE|STATX_MODE|STATX_UID|STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_BTIME,
634 &sx);
635 if (r == -ENOENT)
636 continue;
637 if (r < 0) {
638 /* FUSE, NFS mounts, SELinux might return EACCES */
639 r = log_full_errno(r == -EACCES ? LOG_DEBUG : LOG_ERR, r,
640 "statx(%s/%s) failed: %m", p, de->d_name);
641 continue;
642 }
643
644 if (FLAGS_SET(sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT)) {
645 /* Yay, we have the mount point API, use it */
646 if (FLAGS_SET(sx.stx_attributes, STATX_ATTR_MOUNT_ROOT)) {
647 log_debug("Ignoring \"%s/%s\": different mount points.", p, de->d_name);
648 continue;
649 }
650 } else {
651 /* So we might have statx() but the STATX_ATTR_MOUNT_ROOT flag is not supported, fall
652 * back to traditional stx_dev checking. */
653 if (sx.stx_dev_major != rootdev_major ||
654 sx.stx_dev_minor != rootdev_minor) {
655 log_debug("Ignoring \"%s/%s\": different filesystem.", p, de->d_name);
656 continue;
657 }
658
659 /* Try to detect bind mounts of the same filesystem instance; they do not differ in device
660 * major/minors. This type of query is not supported on all kernels or filesystem types
661 * though. */
662 if (S_ISDIR(sx.stx_mode)) {
663 int q;
664
665 q = fd_is_mount_point(dirfd(d), de->d_name, 0);
666 if (q < 0)
667 log_debug_errno(q, "Failed to determine whether \"%s/%s\" is a mount point, ignoring: %m", p, de->d_name);
668 else if (q > 0) {
669 log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.", p, de->d_name);
670 continue;
671 }
672 }
673 }
674
675 atime_nsec = FLAGS_SET(sx.stx_mask, STATX_ATIME) ? load_statx_timestamp_nsec(&sx.stx_atime) : 0;
676 mtime_nsec = FLAGS_SET(sx.stx_mask, STATX_MTIME) ? load_statx_timestamp_nsec(&sx.stx_mtime) : 0;
677 ctime_nsec = FLAGS_SET(sx.stx_mask, STATX_CTIME) ? load_statx_timestamp_nsec(&sx.stx_ctime) : 0;
678 btime_nsec = FLAGS_SET(sx.stx_mask, STATX_BTIME) ? load_statx_timestamp_nsec(&sx.stx_btime) : 0;
679
680 sub_path = path_join(p, de->d_name);
681 if (!sub_path) {
682 r = log_oom();
683 goto finish;
684 }
685
686 /* Is there an item configured for this path? */
687 if (ordered_hashmap_get(items, sub_path)) {
688 log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
689 continue;
690 }
691
692 if (find_glob(globs, sub_path)) {
693 log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
694 continue;
695 }
696
697 if (S_ISDIR(sx.stx_mode)) {
698 _cleanup_closedir_ DIR *sub_dir = NULL;
699
700 if (mountpoint &&
701 streq(de->d_name, "lost+found") &&
702 sx.stx_uid == 0) {
703 log_debug("Ignoring directory \"%s\".", sub_path);
704 continue;
705 }
706
707 if (maxdepth <= 0)
708 log_warning("Reached max depth on \"%s\".", sub_path);
709 else {
710 int q;
711
712 sub_dir = xopendirat_nomod(dirfd(d), de->d_name);
713 if (!sub_dir) {
714 if (errno != ENOENT)
715 r = log_warning_errno(errno, "Opening directory \"%s\" failed, ignoring: %m", sub_path);
716
717 continue;
718 }
719
720 if (flock(dirfd(sub_dir), LOCK_EX|LOCK_NB) < 0) {
721 log_debug_errno(errno, "Couldn't acquire shared BSD lock on directory \"%s\", skipping: %m", p);
722 continue;
723 }
724
725 q = dir_cleanup(i,
726 sub_path, sub_dir,
727 atime_nsec, mtime_nsec, cutoff_nsec,
728 rootdev_major, rootdev_minor,
729 false, maxdepth-1, false,
730 age_by_file, age_by_dir);
731 if (q < 0)
732 r = q;
733 }
734
735 /* Note: if you are wondering why we don't support the sticky bit for excluding
736 * directories from cleaning like we do it for other file system objects: well, the
737 * sticky bit already has a meaning for directories, so we don't want to overload
738 * that. */
739
740 if (keep_this_level) {
741 log_debug("Keeping directory \"%s\".", sub_path);
742 continue;
743 }
744
745 /*
746 * Check the file timestamps of an entry against the
747 * given cutoff time; delete if it is older.
748 */
749 if (!needs_cleanup(atime_nsec, btime_nsec, ctime_nsec, mtime_nsec,
750 cutoff_nsec, sub_path, age_by_dir, true))
751 continue;
752
753 log_debug("Removing directory \"%s\".", sub_path);
754 if (unlinkat(dirfd(d), de->d_name, AT_REMOVEDIR) < 0)
755 if (!IN_SET(errno, ENOENT, ENOTEMPTY))
756 r = log_warning_errno(errno, "Failed to remove directory \"%s\", ignoring: %m", sub_path);
757
758 } else {
759 _cleanup_close_ int fd = -EBADF;
760
761 /* Skip files for which the sticky bit is set. These are semantics we define, and are
762 * unknown elsewhere. See XDG_RUNTIME_DIR specification for details. */
763 if (sx.stx_mode & S_ISVTX) {
764 log_debug("Skipping \"%s\": sticky bit set.", sub_path);
765 continue;
766 }
767
768 if (mountpoint &&
769 S_ISREG(sx.stx_mode) &&
770 sx.stx_uid == 0 &&
771 STR_IN_SET(de->d_name,
772 ".journal",
773 "aquota.user",
774 "aquota.group")) {
775 log_debug("Skipping \"%s\".", sub_path);
776 continue;
777 }
778
779 /* Ignore sockets that are listed in /proc/net/unix */
780 if (S_ISSOCK(sx.stx_mode) && unix_socket_alive(sub_path)) {
781 log_debug("Skipping \"%s\": live socket.", sub_path);
782 continue;
783 }
784
785 /* Ignore device nodes */
786 if (S_ISCHR(sx.stx_mode) || S_ISBLK(sx.stx_mode)) {
787 log_debug("Skipping \"%s\": a device.", sub_path);
788 continue;
789 }
790
791 /* Keep files on this level around if this is requested */
792 if (keep_this_level) {
793 log_debug("Keeping \"%s\".", sub_path);
794 continue;
795 }
796
797 if (!needs_cleanup(atime_nsec, btime_nsec, ctime_nsec, mtime_nsec,
798 cutoff_nsec, sub_path, age_by_file, false))
799 continue;
800
801 fd = xopenat(dirfd(d), de->d_name, O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME, 0);
802 if (fd < 0 && fd != -ENOENT)
803 log_warning_errno(fd, "Opening file \"%s\" failed, ignoring: %m", sub_path);
804 if (fd >= 0 && flock(fd, LOCK_EX|LOCK_NB) < 0 && errno == EAGAIN) {
805 log_debug_errno(errno, "Couldn't acquire shared BSD lock on file \"%s\", skipping: %m", p);
806 continue;
807 }
808
809 log_debug("Removing \"%s\".", sub_path);
810 if (unlinkat(dirfd(d), de->d_name, 0) < 0)
811 if (errno != ENOENT)
812 r = log_warning_errno(errno, "Failed to remove \"%s\", ignoring: %m", sub_path);
813
814 deleted = true;
815 }
816 }
817
818 finish:
819 if (deleted) {
820 struct timespec ts[2];
821
822 log_debug("Restoring access and modification time on \"%s\": %s, %s",
823 p,
824 FORMAT_TIMESTAMP_STYLE(self_atime_nsec / NSEC_PER_USEC, TIMESTAMP_US),
825 FORMAT_TIMESTAMP_STYLE(self_mtime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
826
827 timespec_store_nsec(ts + 0, self_atime_nsec);
828 timespec_store_nsec(ts + 1, self_mtime_nsec);
829
830 /* Restore original directory timestamps */
831 if (futimens(dirfd(d), ts) < 0)
832 log_warning_errno(errno, "Failed to revert timestamps of '%s', ignoring: %m", p);
833 }
834
835 return r;
836 }
837
838 static bool dangerous_hardlinks(void) {
839 _cleanup_free_ char *value = NULL;
840 static int cached = -1;
841 int r;
842
843 /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
844 * what the upstream default is. */
845
846 if (cached >= 0)
847 return cached;
848
849 r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
850 if (r < 0) {
851 log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
852 return true;
853 }
854
855 r = parse_boolean(value);
856 if (r < 0) {
857 log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
858 return true;
859 }
860
861 cached = r == 0;
862 return cached;
863 }
864
865 static bool hardlink_vulnerable(const struct stat *st) {
866 assert(st);
867
868 return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
869 }
870
871 static mode_t process_mask_perms(mode_t mode, mode_t current) {
872
873 if ((current & 0111) == 0)
874 mode &= ~0111;
875 if ((current & 0222) == 0)
876 mode &= ~0222;
877 if ((current & 0444) == 0)
878 mode &= ~0444;
879 if (!S_ISDIR(current))
880 mode &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
881
882 return mode;
883 }
884
885 static int fd_set_perms(
886 Item *i,
887 int fd,
888 const char *path,
889 const struct stat *st,
890 CreationMode creation) {
891
892 bool do_chown, do_chmod;
893 struct stat stbuf;
894 mode_t new_mode;
895 uid_t new_uid;
896 gid_t new_gid;
897 int r;
898
899 assert(i);
900 assert(fd >= 0);
901 assert(path);
902
903 if (!i->mode_set && !i->uid_set && !i->gid_set)
904 goto shortcut;
905
906 if (!st) {
907 if (fstat(fd, &stbuf) < 0)
908 return log_error_errno(errno, "fstat(%s) failed: %m", path);
909 st = &stbuf;
910 }
911
912 if (hardlink_vulnerable(st))
913 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
914 "Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
915 path);
916 new_uid = i->uid_set && (creation != CREATION_EXISTING || !i->uid_only_create) ? i->uid : st->st_uid;
917 new_gid = i->gid_set && (creation != CREATION_EXISTING || !i->gid_only_create) ? i->gid : st->st_gid;
918
919 /* Do we need a chown()? */
920 do_chown = (new_uid != st->st_uid) || (new_gid != st->st_gid);
921
922 /* Calculate the mode to apply */
923 new_mode = i->mode_set && (creation != CREATION_EXISTING || !i->mode_only_create) ?
924 (i->mask_perms ? process_mask_perms(i->mode, st->st_mode) : i->mode) :
925 (st->st_mode & 07777);
926
927 do_chmod = ((new_mode ^ st->st_mode) & 07777) != 0;
928
929 if (do_chmod && do_chown) {
930 /* Before we issue the chmod() let's reduce the access mode to the common bits of the old and
931 * the new mode. That way there's no time window where the file exists under the old owner
932 * with more than the old access modes — and not under the new owner with more than the new
933 * access modes either. */
934
935 if (S_ISLNK(st->st_mode))
936 log_debug("Skipping temporary mode fix for symlink %s.", path);
937 else {
938 mode_t m = new_mode & st->st_mode; /* Mask new mode by old mode */
939
940 if (((m ^ st->st_mode) & 07777) == 0)
941 log_debug("\"%s\" matches temporary mode %o already.", path, m);
942 else {
943 log_debug("Temporarily changing \"%s\" to mode %o.", path, m);
944 r = fchmod_opath(fd, m);
945 if (r < 0)
946 return log_error_errno(r, "fchmod() of %s failed: %m", path);
947 }
948 }
949 }
950
951 if (do_chown) {
952 log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT, path, new_uid, new_gid);
953
954 if (fchownat(fd, "",
955 new_uid != st->st_uid ? new_uid : UID_INVALID,
956 new_gid != st->st_gid ? new_gid : GID_INVALID,
957 AT_EMPTY_PATH) < 0)
958 return log_error_errno(errno, "fchownat() of %s failed: %m", path);
959 }
960
961 /* Now, apply the final mode. We do this in two cases: when the user set a mode explicitly, or after a
962 * chown(), since chown()'s mangle the access mode in regards to sgid/suid in some conditions. */
963 if (do_chmod || do_chown) {
964 if (S_ISLNK(st->st_mode))
965 log_debug("Skipping mode fix for symlink %s.", path);
966 else {
967 log_debug("Changing \"%s\" to mode %o.", path, new_mode);
968 r = fchmod_opath(fd, new_mode);
969 if (r < 0)
970 return log_error_errno(r, "fchmod() of %s failed: %m", path);
971 }
972 }
973
974 shortcut:
975 return label_fix_full(fd, /* inode_path= */ NULL, /* label_path= */ path, 0);
976 }
977
978 static int path_open_parent_safe(const char *path, bool allow_failure) {
979 _cleanup_free_ char *dn = NULL;
980 int r, fd;
981
982 if (!path_is_normalized(path))
983 return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR,
984 SYNTHETIC_ERRNO(EINVAL),
985 "Failed to open parent of '%s': path not normalized%s.",
986 path,
987 allow_failure ? ", ignoring" : "");
988
989 r = path_extract_directory(path, &dn);
990 if (r < 0)
991 return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR,
992 r,
993 "Unable to determine parent directory of '%s'%s: %m",
994 path,
995 allow_failure ? ", ignoring" : "");
996
997 r = chase(dn, arg_root, allow_failure ? CHASE_SAFE : CHASE_SAFE|CHASE_WARN, NULL, &fd);
998 if (r == -ENOLINK) /* Unsafe symlink: already covered by CHASE_WARN */
999 return r;
1000 if (r < 0)
1001 return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR,
1002 r,
1003 "Failed to open path '%s'%s: %m",
1004 dn,
1005 allow_failure ? ", ignoring" : "");
1006
1007 return fd;
1008 }
1009
1010 static int path_open_safe(const char *path) {
1011 int r, fd;
1012
1013 /* path_open_safe() returns a file descriptor opened with O_PATH after
1014 * verifying that the path doesn't contain unsafe transitions, except
1015 * for its final component as the function does not follow symlink. */
1016
1017 assert(path);
1018
1019 if (!path_is_normalized(path))
1020 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to open invalid path '%s'.", path);
1021
1022 r = chase(path, arg_root, CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL, &fd);
1023 if (r == -ENOLINK)
1024 return r; /* Unsafe symlink: already covered by CHASE_WARN */
1025 if (r < 0)
1026 return log_error_errno(r, "Failed to open path %s: %m", path);
1027
1028 return fd;
1029 }
1030
1031 static int path_set_perms(
1032 Item *i,
1033 const char *path,
1034 CreationMode creation) {
1035
1036 _cleanup_close_ int fd = -EBADF;
1037
1038 assert(i);
1039 assert(path);
1040
1041 fd = path_open_safe(path);
1042 if (fd < 0)
1043 return fd;
1044
1045 return fd_set_perms(i, fd, path, /* st= */ NULL, creation);
1046 }
1047
1048 static int parse_xattrs_from_arg(Item *i) {
1049 const char *p;
1050 int r;
1051
1052 assert(i);
1053
1054 assert_se(p = i->argument);
1055 for (;;) {
1056 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
1057
1058 r = extract_first_word(&p, &xattr, NULL, EXTRACT_UNQUOTE|EXTRACT_CUNESCAPE);
1059 if (r < 0)
1060 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
1061 if (r <= 0)
1062 break;
1063
1064 r = split_pair(xattr, "=", &name, &value);
1065 if (r < 0) {
1066 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
1067 continue;
1068 }
1069
1070 if (isempty(name) || isempty(value)) {
1071 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
1072 continue;
1073 }
1074
1075 if (strv_push_pair(&i->xattrs, name, value) < 0)
1076 return log_oom();
1077
1078 name = value = NULL;
1079 }
1080
1081 return 0;
1082 }
1083
1084 static int fd_set_xattrs(
1085 Item *i,
1086 int fd,
1087 const char *path,
1088 const struct stat *st,
1089 CreationMode creation) {
1090
1091 assert(i);
1092 assert(fd >= 0);
1093 assert(path);
1094
1095 STRV_FOREACH_PAIR(name, value, i->xattrs) {
1096 log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
1097 if (setxattr(FORMAT_PROC_FD_PATH(fd), *name, *value, strlen(*value), 0) < 0)
1098 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
1099 *name, *value, path);
1100 }
1101 return 0;
1102 }
1103
1104 static int path_set_xattrs(
1105 Item *i,
1106 const char *path,
1107 CreationMode creation) {
1108
1109 _cleanup_close_ int fd = -EBADF;
1110
1111 assert(i);
1112 assert(path);
1113
1114 fd = path_open_safe(path);
1115 if (fd < 0)
1116 return fd;
1117
1118 return fd_set_xattrs(i, fd, path, /* st = */ NULL, creation);
1119 }
1120
1121 static int parse_acls_from_arg(Item *item) {
1122 #if HAVE_ACL
1123 int r;
1124
1125 assert(item);
1126
1127 /* If append_or_force (= modify) is set, we will not modify the acl
1128 * afterwards, so the mask can be added now if necessary. */
1129
1130 r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->append_or_force);
1131 if (r < 0)
1132 log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
1133 #else
1134 log_warning("ACLs are not supported. Ignoring.");
1135 #endif
1136
1137 return 0;
1138 }
1139
1140 #if HAVE_ACL
1141 static int path_set_acl(
1142 const char *path,
1143 const char *pretty,
1144 acl_type_t type,
1145 acl_t acl,
1146 bool modify) {
1147
1148 _cleanup_(acl_free_charpp) char *t = NULL;
1149 _cleanup_(acl_freep) acl_t dup = NULL;
1150 int r;
1151
1152 /* Returns 0 for success, positive error if already warned,
1153 * negative error otherwise. */
1154
1155 if (modify) {
1156 r = acls_for_file(path, type, acl, &dup);
1157 if (r < 0)
1158 return r;
1159
1160 r = calc_acl_mask_if_needed(&dup);
1161 if (r < 0)
1162 return r;
1163 } else {
1164 dup = acl_dup(acl);
1165 if (!dup)
1166 return -errno;
1167
1168 /* the mask was already added earlier if needed */
1169 }
1170
1171 r = add_base_acls_if_needed(&dup, path);
1172 if (r < 0)
1173 return r;
1174
1175 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
1176 log_debug("Setting %s ACL %s on %s.",
1177 type == ACL_TYPE_ACCESS ? "access" : "default",
1178 strna(t), pretty);
1179
1180 r = acl_set_file(path, type, dup);
1181 if (r < 0) {
1182 if (ERRNO_IS_NOT_SUPPORTED(errno))
1183 /* No error if filesystem doesn't support ACLs. Return negative. */
1184 return -errno;
1185 else
1186 /* Return positive to indicate we already warned */
1187 return -log_error_errno(errno,
1188 "Setting %s ACL \"%s\" on %s failed: %m",
1189 type == ACL_TYPE_ACCESS ? "access" : "default",
1190 strna(t), pretty);
1191 }
1192 return 0;
1193 }
1194 #endif
1195
1196 static int fd_set_acls(
1197 Item *item,
1198 int fd,
1199 const char *path,
1200 const struct stat *st,
1201 CreationMode creation) {
1202
1203 int r = 0;
1204 #if HAVE_ACL
1205 struct stat stbuf;
1206
1207 assert(item);
1208 assert(fd >= 0);
1209 assert(path);
1210
1211 if (!st) {
1212 if (fstat(fd, &stbuf) < 0)
1213 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1214 st = &stbuf;
1215 }
1216
1217 if (hardlink_vulnerable(st))
1218 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
1219 "Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
1220 path);
1221
1222 if (S_ISLNK(st->st_mode)) {
1223 log_debug("Skipping ACL fix for symlink %s.", path);
1224 return 0;
1225 }
1226
1227 if (item->acl_access)
1228 r = path_set_acl(FORMAT_PROC_FD_PATH(fd), path, ACL_TYPE_ACCESS, item->acl_access, item->append_or_force);
1229
1230 /* set only default acls to folders */
1231 if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
1232 r = path_set_acl(FORMAT_PROC_FD_PATH(fd), path, ACL_TYPE_DEFAULT, item->acl_default, item->append_or_force);
1233
1234 if (ERRNO_IS_NOT_SUPPORTED(r)) {
1235 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1236 return 0;
1237 }
1238
1239 if (r > 0)
1240 return -r; /* already warned */
1241
1242 /* The above procfs paths don't work if /proc is not mounted. */
1243 if (r == -ENOENT && proc_mounted() == 0)
1244 r = -ENOSYS;
1245
1246 if (r < 0)
1247 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1248 #endif
1249 return r;
1250 }
1251
1252 static int path_set_acls(Item *item, const char *path, CreationMode creation) {
1253 int r = 0;
1254 #if HAVE_ACL
1255 _cleanup_close_ int fd = -EBADF;
1256
1257 assert(item);
1258 assert(path);
1259
1260 fd = path_open_safe(path);
1261 if (fd < 0)
1262 return fd;
1263
1264 r = fd_set_acls(item, fd, path, /* st= */ NULL, creation);
1265 #endif
1266 return r;
1267 }
1268
1269 static int parse_attribute_from_arg(Item *item) {
1270
1271 static const struct {
1272 char character;
1273 unsigned value;
1274 } attributes[] = {
1275 { 'A', FS_NOATIME_FL }, /* do not update atime */
1276 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1277 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1278 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1279 { 'c', FS_COMPR_FL }, /* Compress file */
1280 { 'd', FS_NODUMP_FL }, /* do not dump file */
1281 { 'e', FS_EXTENT_FL }, /* Extents */
1282 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1283 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1284 { 's', FS_SECRM_FL }, /* Secure deletion */
1285 { 'u', FS_UNRM_FL }, /* Undelete */
1286 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1287 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1288 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1289 { 'P', FS_PROJINHERIT_FL }, /* Inherit the quota project ID */
1290 };
1291
1292 enum {
1293 MODE_ADD,
1294 MODE_DEL,
1295 MODE_SET
1296 } mode = MODE_ADD;
1297
1298 unsigned value = 0, mask = 0;
1299 const char *p;
1300
1301 assert(item);
1302
1303 p = item->argument;
1304 if (p) {
1305 if (*p == '+') {
1306 mode = MODE_ADD;
1307 p++;
1308 } else if (*p == '-') {
1309 mode = MODE_DEL;
1310 p++;
1311 } else if (*p == '=') {
1312 mode = MODE_SET;
1313 p++;
1314 }
1315 }
1316
1317 if (isempty(p) && mode != MODE_SET)
1318 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1319 "Setting file attribute on '%s' needs an attribute specification.",
1320 item->path);
1321
1322 for (; p && *p ; p++) {
1323 unsigned i, v;
1324
1325 for (i = 0; i < ELEMENTSOF(attributes); i++)
1326 if (*p == attributes[i].character)
1327 break;
1328
1329 if (i >= ELEMENTSOF(attributes))
1330 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1331 "Unknown file attribute '%c' on '%s'.",
1332 *p, item->path);
1333
1334 v = attributes[i].value;
1335
1336 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1337
1338 mask |= v;
1339 }
1340
1341 if (mode == MODE_SET)
1342 mask |= CHATTR_ALL_FL;
1343
1344 assert(mask != 0);
1345
1346 item->attribute_mask = mask;
1347 item->attribute_value = value;
1348 item->attribute_set = true;
1349
1350 return 0;
1351 }
1352
1353 static int fd_set_attribute(
1354 Item *item,
1355 int fd,
1356 const char *path,
1357 const struct stat *st,
1358 CreationMode creation) {
1359
1360 _cleanup_close_ int procfs_fd = -EBADF;
1361 struct stat stbuf;
1362 unsigned f;
1363 int r;
1364
1365 assert(item);
1366 assert(fd >= 0);
1367 assert(path);
1368
1369 if (!item->attribute_set || item->attribute_mask == 0)
1370 return 0;
1371
1372 if (!st) {
1373 if (fstat(fd, &stbuf) < 0)
1374 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1375 st = &stbuf;
1376 }
1377
1378 /* Issuing the file attribute ioctls on device nodes is not safe, as that will be delivered to the
1379 * drivers, not the file system containing the device node. */
1380 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
1381 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1382 "Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
1383 path);
1384
1385 f = item->attribute_value & item->attribute_mask;
1386
1387 /* Mask away directory-specific flags */
1388 if (!S_ISDIR(st->st_mode))
1389 f &= ~FS_DIRSYNC_FL;
1390
1391 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1392 if (procfs_fd < 0)
1393 return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
1394
1395 unsigned previous, current;
1396 r = chattr_full(NULL, procfs_fd, f, item->attribute_mask, &previous, &current, CHATTR_FALLBACK_BITWISE);
1397 if (r == -ENOANO)
1398 log_warning("Cannot set file attributes for '%s', maybe due to incompatibility in specified attributes, "
1399 "previous=0x%08x, current=0x%08x, expected=0x%08x, ignoring.",
1400 path, previous, current, (previous & ~item->attribute_mask) | (f & item->attribute_mask));
1401 else if (r < 0)
1402 log_full_errno(ERRNO_IS_NOT_SUPPORTED(r) ? LOG_DEBUG : LOG_WARNING, r,
1403 "Cannot set file attributes for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1404 path, item->attribute_value, item->attribute_mask);
1405
1406 return 0;
1407 }
1408
1409 static int path_set_attribute(Item *item, const char *path, CreationMode creation) {
1410 _cleanup_close_ int fd = -EBADF;
1411
1412 if (!item->attribute_set || item->attribute_mask == 0)
1413 return 0;
1414
1415 fd = path_open_safe(path);
1416 if (fd < 0)
1417 return fd;
1418
1419 return fd_set_attribute(item, fd, path, /* st= */ NULL, creation);
1420 }
1421
1422 static int write_argument_data(Item *i, int fd, const char *path) {
1423 int r;
1424
1425 assert(i);
1426 assert(fd >= 0);
1427 assert(path);
1428
1429 if (item_binary_argument_size(i) == 0)
1430 return 0;
1431
1432 assert(item_binary_argument(i));
1433
1434 log_debug("Writing to \"%s\".", path);
1435
1436 r = loop_write(fd, item_binary_argument(i), item_binary_argument_size(i), /* do_poll= */ false);
1437 if (r < 0)
1438 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1439
1440 return 0;
1441 }
1442
1443 static int write_one_file(Item *i, const char *path, CreationMode creation) {
1444 _cleanup_close_ int fd = -EBADF, dir_fd = -EBADF;
1445 _cleanup_free_ char *bn = NULL;
1446 int r;
1447
1448 assert(i);
1449 assert(path);
1450 assert(i->type == WRITE_FILE);
1451
1452 r = path_extract_filename(path, &bn);
1453 if (r < 0)
1454 return log_error_errno(r, "Failed to extract filename from path '%s': %m", path);
1455 if (r == O_DIRECTORY)
1456 return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for writing, is a directory.", path);
1457
1458 /* Validate the path and keep the fd on the directory for opening the file so we're sure that it
1459 * can't be changed behind our back. */
1460 dir_fd = path_open_parent_safe(path, i->allow_failure);
1461 if (dir_fd < 0)
1462 return dir_fd;
1463
1464 /* Follows symlinks */
1465 fd = openat(dir_fd, bn,
1466 O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY|(i->append_or_force ? O_APPEND : 0),
1467 i->mode);
1468 if (fd < 0) {
1469 if (errno == ENOENT) {
1470 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1471 return 0;
1472 }
1473
1474 if (i->allow_failure)
1475 return log_debug_errno(errno, "Failed to open file \"%s\", ignoring: %m", path);
1476
1477 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1478 }
1479
1480 /* 'w' is allowed to write into any kind of files. */
1481
1482 r = write_argument_data(i, fd, path);
1483 if (r < 0)
1484 return r;
1485
1486 return fd_set_perms(i, fd, path, NULL, creation);
1487 }
1488
1489 static int create_file(Item *i, const char *path) {
1490 _cleanup_close_ int fd = -EBADF, dir_fd = -EBADF;
1491 _cleanup_free_ char *bn = NULL;
1492 struct stat stbuf, *st = NULL;
1493 CreationMode creation;
1494 int r = 0;
1495
1496 assert(i);
1497 assert(path);
1498 assert(i->type == CREATE_FILE);
1499
1500 /* 'f' operates on regular files exclusively. */
1501
1502 r = path_extract_filename(path, &bn);
1503 if (r < 0)
1504 return log_error_errno(r, "Failed to extract filename from path '%s': %m", path);
1505 if (r == O_DIRECTORY)
1506 return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for writing, is a directory.", path);
1507
1508 /* Validate the path and keep the fd on the directory for opening the file so we're sure that it
1509 * can't be changed behind our back. */
1510 dir_fd = path_open_parent_safe(path, i->allow_failure);
1511 if (dir_fd < 0)
1512 return dir_fd;
1513
1514 WITH_UMASK(0000) {
1515 mac_selinux_create_file_prepare(path, S_IFREG);
1516 fd = RET_NERRNO(openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode));
1517 mac_selinux_create_file_clear();
1518 }
1519
1520 if (fd < 0) {
1521 /* Even on a read-only filesystem, open(2) returns EEXIST if the file already exists. It
1522 * returns EROFS only if it needs to create the file. */
1523 if (fd != -EEXIST)
1524 return log_error_errno(fd, "Failed to create file %s: %m", path);
1525
1526 /* Re-open the file. At that point it must exist since open(2) failed with EEXIST. We still
1527 * need to check if the perms/mode need to be changed. For read-only filesystems, we let
1528 * fd_set_perms() report the error if the perms need to be modified. */
1529 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1530 if (fd < 0)
1531 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1532
1533 if (fstat(fd, &stbuf) < 0)
1534 return log_error_errno(errno, "stat(%s) failed: %m", path);
1535
1536 if (!S_ISREG(stbuf.st_mode))
1537 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1538 "%s exists and is not a regular file.",
1539 path);
1540
1541 st = &stbuf;
1542 creation = CREATION_EXISTING;
1543 } else {
1544 r = write_argument_data(i, fd, path);
1545 if (r < 0)
1546 return r;
1547
1548 creation = CREATION_NORMAL;
1549 }
1550
1551 return fd_set_perms(i, fd, path, st, creation);
1552 }
1553
1554 static int truncate_file(Item *i, const char *path) {
1555 _cleanup_close_ int fd = -EBADF, dir_fd = -EBADF;
1556 _cleanup_free_ char *bn = NULL;
1557 struct stat stbuf, *st = NULL;
1558 CreationMode creation;
1559 bool erofs = false;
1560 int r = 0;
1561
1562 assert(i);
1563 assert(path);
1564 assert(i->type == TRUNCATE_FILE || (i->type == CREATE_FILE && i->append_or_force));
1565
1566 /* We want to operate on regular file exclusively especially since O_TRUNC is unspecified if the file
1567 * is neither a regular file nor a fifo nor a terminal device. Therefore we first open the file and
1568 * make sure it's a regular one before truncating it. */
1569
1570 r = path_extract_filename(path, &bn);
1571 if (r < 0)
1572 return log_error_errno(r, "Failed to extract filename from path '%s': %m", path);
1573 if (r == O_DIRECTORY)
1574 return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for truncation, is a directory.", path);
1575
1576 /* Validate the path and keep the fd on the directory for opening the file so we're sure that it
1577 * can't be changed behind our back. */
1578 dir_fd = path_open_parent_safe(path, i->allow_failure);
1579 if (dir_fd < 0)
1580 return dir_fd;
1581
1582 creation = CREATION_EXISTING;
1583 fd = RET_NERRNO(openat(dir_fd, bn, O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode));
1584 if (fd == -ENOENT) {
1585 creation = CREATION_NORMAL; /* Didn't work without O_CREATE, try again with */
1586
1587 WITH_UMASK(0000) {
1588 mac_selinux_create_file_prepare(path, S_IFREG);
1589 fd = RET_NERRNO(openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode));
1590 mac_selinux_create_file_clear();
1591 }
1592 }
1593
1594 if (fd < 0) {
1595 if (fd != -EROFS)
1596 return log_error_errno(fd, "Failed to open/create file %s: %m", path);
1597
1598 /* On a read-only filesystem, we don't want to fail if the target is already empty and the
1599 * perms are set. So we still proceed with the sanity checks and let the remaining operations
1600 * fail with EROFS if they try to modify the target file. */
1601
1602 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1603 if (fd < 0) {
1604 if (errno == ENOENT)
1605 return log_error_errno(SYNTHETIC_ERRNO(EROFS),
1606 "Cannot create file %s on a read-only file system.",
1607 path);
1608
1609 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1610 }
1611
1612 erofs = true;
1613 creation = CREATION_EXISTING;
1614 }
1615
1616 if (fstat(fd, &stbuf) < 0)
1617 return log_error_errno(errno, "stat(%s) failed: %m", path);
1618
1619 if (!S_ISREG(stbuf.st_mode))
1620 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1621 "%s exists and is not a regular file.",
1622 path);
1623
1624 if (stbuf.st_size > 0) {
1625 if (ftruncate(fd, 0) < 0) {
1626 r = erofs ? -EROFS : -errno;
1627 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1628 }
1629 } else
1630 st = &stbuf;
1631
1632 log_debug("\"%s\" has been created.", path);
1633
1634 if (item_binary_argument(i)) {
1635 r = write_argument_data(i, fd, path);
1636 if (r < 0)
1637 return r;
1638 }
1639
1640 return fd_set_perms(i, fd, path, st, creation);
1641 }
1642
1643 static int copy_files(Item *i) {
1644 _cleanup_close_ int dfd = -EBADF, fd = -EBADF;
1645 _cleanup_free_ char *bn = NULL;
1646 struct stat st, a;
1647 int r;
1648
1649 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1650
1651 r = path_extract_filename(i->path, &bn);
1652 if (r < 0)
1653 return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path);
1654
1655 /* Validate the path and use the returned directory fd for copying the target so we're sure that the
1656 * path can't be changed behind our back. */
1657 dfd = path_open_parent_safe(i->path, i->allow_failure);
1658 if (dfd < 0)
1659 return dfd;
1660
1661 r = copy_tree_at(AT_FDCWD, i->argument,
1662 dfd, bn,
1663 i->uid_set ? i->uid : UID_INVALID,
1664 i->gid_set ? i->gid : GID_INVALID,
1665 COPY_REFLINK | COPY_MERGE_EMPTY | COPY_MAC_CREATE | COPY_HARDLINKS,
1666 NULL);
1667
1668 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1669 if (fd < 0) {
1670 if (r < 0) /* Look at original error first */
1671 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1672
1673 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1674 }
1675
1676 if (fstat(fd, &st) < 0)
1677 return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
1678
1679 if (stat(i->argument, &a) < 0)
1680 return log_error_errno(errno, "Failed to stat(%s): %m", i->argument);
1681
1682 if (((st.st_mode ^ a.st_mode) & S_IFMT) != 0) {
1683 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1684 return 0;
1685 }
1686
1687 return fd_set_perms(i, fd, i->path, &st, _CREATION_MODE_INVALID);
1688 }
1689
1690 static int create_directory_or_subvolume(
1691 const char *path,
1692 mode_t mode,
1693 bool subvol,
1694 bool allow_failure,
1695 struct stat *ret_st,
1696 CreationMode *ret_creation) {
1697
1698 _cleanup_free_ char *bn = NULL;
1699 _cleanup_close_ int pfd = -EBADF;
1700 CreationMode creation;
1701 struct stat st;
1702 int r, fd;
1703
1704 assert(path);
1705
1706 r = path_extract_filename(path, &bn);
1707 if (r < 0)
1708 return log_error_errno(r, "Failed to extract filename from path '%s': %m", path);
1709
1710 pfd = path_open_parent_safe(path, allow_failure);
1711 if (pfd < 0)
1712 return pfd;
1713
1714 if (subvol) {
1715 r = getenv_bool("SYSTEMD_TMPFILES_FORCE_SUBVOL");
1716 if (r < 0) {
1717 if (r != -ENXIO) /* env var is unset */
1718 log_warning_errno(r, "Cannot parse value of $SYSTEMD_TMPFILES_FORCE_SUBVOL, ignoring.");
1719 r = btrfs_is_subvol(empty_to_root(arg_root)) > 0;
1720 }
1721 if (r == 0)
1722 /* Don't create a subvolume unless the root directory is one, too. We do this under
1723 * the assumption that if the root directory is just a plain directory (i.e. very
1724 * light-weight), we shouldn't try to split it up into subvolumes (i.e. more
1725 * heavy-weight). Thus, chroot() environments and suchlike will get a full brtfs
1726 * subvolume set up below their tree only if they specifically set up a btrfs
1727 * subvolume for the root dir too. */
1728
1729 subvol = false;
1730 else {
1731 WITH_UMASK((~mode) & 0777)
1732 r = btrfs_subvol_make_fd(pfd, bn);
1733 }
1734 } else
1735 r = 0;
1736
1737 if (!subvol || ERRNO_IS_NOT_SUPPORTED(r))
1738 WITH_UMASK(0000)
1739 r = mkdirat_label(pfd, bn, mode);
1740
1741 creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING;
1742
1743 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_DIRECTORY|O_PATH);
1744 if (fd < 0) {
1745 /* We couldn't open it because it is not actually a directory? */
1746 if (errno == ENOTDIR)
1747 return log_error_errno(SYNTHETIC_ERRNO(EEXIST), "\"%s\" already exists and is not a directory.", path);
1748
1749 /* Then look at the original error */
1750 if (r < 0)
1751 return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR,
1752 r,
1753 "Failed to create directory or subvolume \"%s\"%s: %m",
1754 path,
1755 allow_failure ? ", ignoring" : "");
1756
1757 return log_error_errno(errno, "Failed to open directory/subvolume we just created '%s': %m", path);
1758 }
1759
1760 if (fstat(fd, &st) < 0)
1761 return log_error_errno(errno, "Failed to fstat(%s): %m", path);
1762
1763 assert(S_ISDIR(st.st_mode)); /* we used O_DIRECTORY above */
1764
1765 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(creation), path);
1766
1767 if (ret_st)
1768 *ret_st = st;
1769 if (ret_creation)
1770 *ret_creation = creation;
1771
1772 return fd;
1773 }
1774
1775 static int create_directory(Item *i, const char *path) {
1776 _cleanup_close_ int fd = -EBADF;
1777 CreationMode creation;
1778 struct stat st;
1779
1780 assert(i);
1781 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
1782
1783 fd = create_directory_or_subvolume(path, i->mode, /* subvol= */ false, i->allow_failure, &st, &creation);
1784 if (fd == -EEXIST)
1785 return 0;
1786 if (fd < 0)
1787 return fd;
1788
1789 return fd_set_perms(i, fd, path, &st, creation);
1790 }
1791
1792 static int create_subvolume(Item *i, const char *path) {
1793 _cleanup_close_ int fd = -EBADF;
1794 CreationMode creation;
1795 struct stat st;
1796 int r, q = 0;
1797
1798 assert(i);
1799 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
1800
1801 fd = create_directory_or_subvolume(path, i->mode, /* subvol = */ true, i->allow_failure, &st, &creation);
1802 if (fd == -EEXIST)
1803 return 0;
1804 if (fd < 0)
1805 return fd;
1806
1807 if (creation == CREATION_NORMAL &&
1808 IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
1809 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
1810 if (r == -ENOTTY)
1811 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
1812 else if (r == -EROFS)
1813 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
1814 else if (r == -ENOTCONN)
1815 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
1816 else if (r < 0)
1817 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
1818 else if (r > 0)
1819 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
1820 else if (r == 0)
1821 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
1822 }
1823
1824 r = fd_set_perms(i, fd, path, &st, creation);
1825 if (q < 0) /* prefer the quota change error from above */
1826 return q;
1827
1828 return r;
1829 }
1830
1831 static int empty_directory(Item *i, const char *path, CreationMode creation) {
1832 _cleanup_close_ int fd = -EBADF;
1833 struct stat st;
1834 int r;
1835
1836 assert(i);
1837 assert(i->type == EMPTY_DIRECTORY);
1838
1839 r = chase(path, arg_root, CHASE_SAFE|CHASE_WARN, NULL, &fd);
1840 if (r == -ENOLINK) /* Unsafe symlink: already covered by CHASE_WARN */
1841 return r;
1842 if (r == -ENOENT) {
1843 /* Option "e" operates only on existing objects. Do not print errors about non-existent files
1844 * or directories */
1845 log_debug_errno(r, "Skipping missing directory: %s", path);
1846 return 0;
1847 }
1848 if (r < 0)
1849 return log_error_errno(r, "Failed to open directory '%s': %m", path);
1850
1851 if (fstat(fd, &st) < 0)
1852 return log_error_errno(errno, "Failed to fstat(%s): %m", path);
1853 if (!S_ISDIR(st.st_mode)) {
1854 log_warning("'%s' already exists and is not a directory.", path);
1855 return 0;
1856 }
1857
1858 return fd_set_perms(i, fd, path, &st, creation);
1859 }
1860
1861 static int create_device(Item *i, mode_t file_type) {
1862 _cleanup_close_ int dfd = -EBADF, fd = -EBADF;
1863 _cleanup_free_ char *bn = NULL;
1864 CreationMode creation;
1865 struct stat st;
1866 int r;
1867
1868 assert(i);
1869 assert(IN_SET(i->type, CREATE_BLOCK_DEVICE, CREATE_CHAR_DEVICE));
1870 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
1871
1872 r = path_extract_filename(i->path, &bn);
1873 if (r < 0)
1874 return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path);
1875 if (r == O_DIRECTORY)
1876 return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for creating device node, is a directory.", i->path);
1877
1878 /* Validate the path and use the returned directory fd for copying the target so we're sure that the
1879 * path can't be changed behind our back. */
1880 dfd = path_open_parent_safe(i->path, i->allow_failure);
1881 if (dfd < 0)
1882 return dfd;
1883
1884 WITH_UMASK(0000) {
1885 mac_selinux_create_file_prepare(i->path, file_type);
1886 r = RET_NERRNO(mknodat(dfd, bn, i->mode | file_type, i->major_minor));
1887 mac_selinux_create_file_clear();
1888 }
1889 creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING;
1890
1891 /* Try to open the inode via O_PATH, regardless if we could create it or not. Maybe everything is in
1892 * order anyway and we hence can ignore the error to create the device node */
1893 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1894 if (fd < 0) {
1895 /* OK, so opening the inode failed, let's look at the original error then. */
1896
1897 if (r < 0) {
1898 if (ERRNO_IS_PRIVILEGE(r))
1899 goto handle_privilege;
1900
1901 return log_error_errno(r, "Failed to create device node '%s': %m", i->path);
1902 }
1903
1904 return log_error_errno(errno, "Failed to open device node '%s' we just created: %m", i->path);
1905 }
1906
1907 if (fstat(fd, &st) < 0)
1908 return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
1909
1910 if (((st.st_mode ^ file_type) & S_IFMT) != 0) {
1911
1912 if (i->append_or_force) {
1913 fd = safe_close(fd);
1914
1915 WITH_UMASK(0000) {
1916 mac_selinux_create_file_prepare(i->path, file_type);
1917 r = mknodat_atomic(dfd, bn, i->mode | file_type, i->major_minor);
1918 mac_selinux_create_file_clear();
1919 }
1920 if (ERRNO_IS_PRIVILEGE(r))
1921 goto handle_privilege;
1922 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
1923 r = rm_rf_child(dfd, bn, REMOVE_PHYSICAL);
1924 if (r < 0)
1925 return log_error_errno(r, "rm -rf %s failed: %m", i->path);
1926
1927 mac_selinux_create_file_prepare(i->path, file_type);
1928 r = RET_NERRNO(mknodat(dfd, bn, i->mode | file_type, i->major_minor));
1929 mac_selinux_create_file_clear();
1930 }
1931 if (r < 0)
1932 return log_error_errno(r, "Failed to create device node '%s': %m", i->path);
1933
1934 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1935 if (fd < 0)
1936 return log_error_errno(errno, "Failed to open device node we just created '%s': %m", i->path);
1937
1938 /* Validate type before change ownership below */
1939 if (fstat(fd, &st) < 0)
1940 return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
1941
1942 if (((st.st_mode ^ file_type) & S_IFMT) != 0)
1943 return log_error_errno(SYNTHETIC_ERRNO(EBADF), "Device node we just created is not a device node, refusing.");
1944
1945 creation = CREATION_FORCE;
1946 } else {
1947 log_warning("\"%s\" already exists and is not a device node.", i->path);
1948 return 0;
1949 }
1950 }
1951
1952 log_debug("%s %s device node \"%s\" %u:%u.",
1953 creation_mode_verb_to_string(creation),
1954 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
1955 i->path, major(i->mode), minor(i->mode));
1956
1957 return fd_set_perms(i, fd, i->path, &st, creation);
1958
1959 handle_privilege:
1960 log_debug_errno(r,
1961 "We lack permissions, possibly because of cgroup configuration; "
1962 "skipping creation of device node '%s'.", i->path);
1963 return 0;
1964 }
1965
1966 static int create_fifo(Item *i) {
1967 _cleanup_close_ int pfd = -EBADF, fd = -EBADF;
1968 _cleanup_free_ char *bn = NULL;
1969 CreationMode creation;
1970 struct stat st;
1971 int r;
1972
1973 assert(i);
1974 assert(i->type == CREATE_FIFO);
1975
1976 r = path_extract_filename(i->path, &bn);
1977 if (r < 0)
1978 return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path);
1979 if (r == O_DIRECTORY)
1980 return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for creating FIFO, is a directory.", i->path);
1981
1982 pfd = path_open_parent_safe(i->path, i->allow_failure);
1983 if (pfd < 0)
1984 return pfd;
1985
1986 WITH_UMASK(0000) {
1987 mac_selinux_create_file_prepare(i->path, S_IFIFO);
1988 r = RET_NERRNO(mkfifoat(pfd, bn, i->mode));
1989 mac_selinux_create_file_clear();
1990 }
1991
1992 creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING;
1993
1994 /* Open the inode via O_PATH, regardless if we managed to create it or not. Maybe it is already the FIFO we want */
1995 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1996 if (fd < 0) {
1997 if (r < 0)
1998 return log_error_errno(r, "Failed to create FIFO %s: %m", i->path); /* original error! */
1999
2000 return log_error_errno(errno, "Failed to open FIFO we just created %s: %m", i->path);
2001 }
2002
2003 if (fstat(fd, &st) < 0)
2004 return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
2005
2006 if (!S_ISFIFO(st.st_mode)) {
2007
2008 if (i->append_or_force) {
2009 fd = safe_close(fd);
2010
2011 WITH_UMASK(0000) {
2012 mac_selinux_create_file_prepare(i->path, S_IFIFO);
2013 r = mkfifoat_atomic(pfd, bn, i->mode);
2014 mac_selinux_create_file_clear();
2015 }
2016 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2017 r = rm_rf_child(pfd, bn, REMOVE_PHYSICAL);
2018 if (r < 0)
2019 return log_error_errno(r, "rm -rf %s failed: %m", i->path);
2020
2021 mac_selinux_create_file_prepare(i->path, S_IFIFO);
2022 r = RET_NERRNO(mkfifoat(pfd, bn, i->mode));
2023 mac_selinux_create_file_clear();
2024 }
2025 if (r < 0)
2026 return log_error_errno(r, "Failed to create FIFO %s: %m", i->path);
2027
2028 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
2029 if (fd < 0)
2030 return log_error_errno(errno, "Failed to open FIFO we just created '%s': %m", i->path);
2031
2032 /* Validate type before change ownership below */
2033 if (fstat(fd, &st) < 0)
2034 return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
2035
2036 if (!S_ISFIFO(st.st_mode))
2037 return log_error_errno(SYNTHETIC_ERRNO(EBADF), "FIFO inode we just created is not a FIFO, refusing.");
2038
2039 creation = CREATION_FORCE;
2040 } else {
2041 log_warning("\"%s\" already exists and is not a FIFO.", i->path);
2042 return 0;
2043 }
2044 }
2045
2046 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), i->path);
2047
2048 return fd_set_perms(i, fd, i->path, &st, creation);
2049 }
2050
2051 static int create_symlink(Item *i) {
2052 _cleanup_close_ int pfd = -EBADF, fd = -EBADF;
2053 _cleanup_free_ char *bn = NULL;
2054 CreationMode creation;
2055 struct stat st;
2056 bool good = false;
2057 int r;
2058
2059 assert(i);
2060
2061 r = path_extract_filename(i->path, &bn);
2062 if (r < 0)
2063 return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path);
2064 if (r == O_DIRECTORY)
2065 return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for creating FIFO, is a directory.", i->path);
2066
2067 pfd = path_open_parent_safe(i->path, i->allow_failure);
2068 if (pfd < 0)
2069 return pfd;
2070
2071 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2072 r = RET_NERRNO(symlinkat(i->argument, pfd, bn));
2073 mac_selinux_create_file_clear();
2074
2075 creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING;
2076
2077 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
2078 if (fd < 0) {
2079 if (r < 0)
2080 return log_error_errno(r, "Failed to create symlink '%s': %m", i->path); /* original error! */
2081
2082 return log_error_errno(errno, "Failed to open symlink we just created '%s': %m", i->path);
2083 }
2084
2085 if (fstat(fd, &st) < 0)
2086 return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
2087
2088 if (S_ISLNK(st.st_mode)) {
2089 _cleanup_free_ char *x = NULL;
2090
2091 r = readlinkat_malloc(fd, "", &x);
2092 if (r < 0)
2093 return log_error_errno(r, "readlinkat(%s) failed: %m", i->path);
2094
2095 good = streq(x, i->argument);
2096 } else
2097 good = false;
2098
2099 if (!good) {
2100 if (!i->append_or_force) {
2101 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2102 return 0;
2103 }
2104
2105 fd = safe_close(fd);
2106
2107 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2108 r = symlinkat_atomic_full(i->argument, pfd, bn, /* make_relative= */ false);
2109 mac_selinux_create_file_clear();
2110 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2111 r = rm_rf_child(pfd, bn, REMOVE_PHYSICAL);
2112 if (r < 0)
2113 return log_error_errno(r, "rm -rf %s failed: %m", i->path);
2114
2115 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2116 r = RET_NERRNO(symlinkat(i->argument, pfd, i->path));
2117 mac_selinux_create_file_clear();
2118 }
2119 if (r < 0)
2120 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2121
2122 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
2123 if (fd < 0)
2124 return log_error_errno(errno, "Failed to open symlink we just created '%s': %m", i->path);
2125
2126 /* Validate type before change ownership below */
2127 if (fstat(fd, &st) < 0)
2128 return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
2129
2130 if (!S_ISLNK(st.st_mode))
2131 return log_error_errno(SYNTHETIC_ERRNO(EBADF), "Symlink we just created is not a symlink, refusing.");
2132
2133 creation = CREATION_FORCE;
2134 }
2135
2136 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2137 return fd_set_perms(i, fd, i->path, &st, creation);
2138 }
2139
2140 typedef int (*action_t)(Item *i, const char *path, CreationMode creation);
2141 typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st, CreationMode creation);
2142
2143 static int item_do(
2144 Item *i,
2145 int fd,
2146 const char *path,
2147 CreationMode creation,
2148 fdaction_t action) {
2149
2150 struct stat st;
2151 int r = 0, q;
2152
2153 assert(i);
2154 assert(path);
2155 assert(fd >= 0);
2156
2157 if (fstat(fd, &st) < 0) {
2158 r = log_error_errno(errno, "fstat() on file failed: %m");
2159 goto finish;
2160 }
2161
2162 /* This returns the first error we run into, but nevertheless tries to go on */
2163 r = action(i, fd, path, &st, creation);
2164
2165 if (S_ISDIR(st.st_mode)) {
2166 _cleanup_closedir_ DIR *d = NULL;
2167
2168 /* The passed 'fd' was opened with O_PATH. We need to convert it into a 'regular' fd before
2169 * reading the directory content. */
2170 d = opendir(FORMAT_PROC_FD_PATH(fd));
2171 if (!d) {
2172 log_error_errno(errno, "Failed to opendir() '%s': %m", FORMAT_PROC_FD_PATH(fd));
2173 if (r == 0)
2174 r = -errno;
2175 goto finish;
2176 }
2177
2178 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
2179 int de_fd;
2180
2181 if (dot_or_dot_dot(de->d_name))
2182 continue;
2183
2184 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
2185 if (de_fd < 0)
2186 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
2187 else {
2188 _cleanup_free_ char *de_path = NULL;
2189
2190 de_path = path_join(path, de->d_name);
2191 if (!de_path)
2192 q = log_oom();
2193 else
2194 /* Pass ownership of dirent fd over */
2195 q = item_do(i, de_fd, de_path, CREATION_EXISTING, action);
2196 }
2197
2198 if (q < 0 && r == 0)
2199 r = q;
2200 }
2201 }
2202 finish:
2203 safe_close(fd);
2204 return r;
2205 }
2206
2207 static int glob_item(Item *i, action_t action) {
2208 _cleanup_globfree_ glob_t g = {
2209 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
2210 };
2211 int r = 0, k;
2212
2213 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
2214 if (k < 0 && k != -ENOENT)
2215 return log_error_errno(k, "glob(%s) failed: %m", i->path);
2216
2217 STRV_FOREACH(fn, g.gl_pathv) {
2218 /* We pass CREATION_EXISTING here, since if we are globbing for it, it always has to exist */
2219 k = action(i, *fn, CREATION_EXISTING);
2220 if (k < 0 && r == 0)
2221 r = k;
2222 }
2223
2224 return r;
2225 }
2226
2227 static int glob_item_recursively(Item *i, fdaction_t action) {
2228 _cleanup_globfree_ glob_t g = {
2229 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
2230 };
2231 int r = 0, k;
2232
2233 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
2234 if (k < 0 && k != -ENOENT)
2235 return log_error_errno(k, "glob(%s) failed: %m", i->path);
2236
2237 STRV_FOREACH(fn, g.gl_pathv) {
2238 _cleanup_close_ int fd = -EBADF;
2239
2240 /* Make sure we won't trigger/follow file object (such as
2241 * device nodes, automounts, ...) pointed out by 'fn' with
2242 * O_PATH. Note, when O_PATH is used, flags other than
2243 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
2244
2245 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
2246 if (fd < 0) {
2247 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
2248 if (r == 0)
2249 r = -errno;
2250 continue;
2251 }
2252
2253 k = item_do(i, fd, *fn, CREATION_EXISTING, action);
2254 if (k < 0 && r == 0)
2255 r = k;
2256
2257 /* we passed fd ownership to the previous call */
2258 fd = -EBADF;
2259 }
2260
2261 return r;
2262 }
2263
2264 static int rm_if_wrong_type_safe(
2265 mode_t mode,
2266 int parent_fd,
2267 const struct stat *parent_st, /* Only used if follow_links below is true. */
2268 const char *name,
2269 int flags) {
2270 _cleanup_free_ char *parent_name = NULL;
2271 bool follow_links = !FLAGS_SET(flags, AT_SYMLINK_NOFOLLOW);
2272 struct stat st;
2273 int r;
2274
2275 assert(name);
2276 assert((mode & ~S_IFMT) == 0);
2277 assert(!follow_links || parent_st);
2278 assert((flags & ~AT_SYMLINK_NOFOLLOW) == 0);
2279
2280 if (!filename_is_valid(name))
2281 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "\"%s\" is not a valid filename.", name);
2282
2283 r = fstatat_harder(parent_fd, name, &st, flags, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
2284 if (r < 0) {
2285 (void) fd_get_path(parent_fd, &parent_name);
2286 return log_full_errno(r == -ENOENT? LOG_DEBUG : LOG_ERR, r,
2287 "Failed to stat \"%s\" at \"%s\": %m", name, strna(parent_name));
2288 }
2289
2290 /* Fail before removing anything if this is an unsafe transition. */
2291 if (follow_links && unsafe_transition(parent_st, &st)) {
2292 (void) fd_get_path(parent_fd, &parent_name);
2293 return log_error_errno(SYNTHETIC_ERRNO(ENOLINK),
2294 "Unsafe transition from \"%s\" to \"%s\".", parent_name, name);
2295 }
2296
2297 if ((st.st_mode & S_IFMT) == mode)
2298 return 0;
2299
2300 (void) fd_get_path(parent_fd, &parent_name);
2301 log_notice("Wrong file type 0o%o; rm -rf \"%s/%s\"", st.st_mode & S_IFMT, strna(parent_name), name);
2302
2303 /* If the target of the symlink was the wrong type, the link needs to be removed instead of the
2304 * target, so make sure it is identified as a link and not a directory. */
2305 if (follow_links) {
2306 r = fstatat_harder(parent_fd, name, &st, AT_SYMLINK_NOFOLLOW, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
2307 if (r < 0)
2308 return log_error_errno(r, "Failed to stat \"%s\" at \"%s\": %m", name, strna(parent_name));
2309 }
2310
2311 /* Do not remove mount points. */
2312 r = fd_is_mount_point(parent_fd, name, follow_links ? AT_SYMLINK_FOLLOW : 0);
2313 if (r < 0)
2314 (void) log_warning_errno(r, "Failed to check if \"%s/%s\" is a mount point: %m; Continuing",
2315 strna(parent_name), name);
2316 else if (r > 0)
2317 return log_error_errno(SYNTHETIC_ERRNO(EBUSY),
2318 "Not removing \"%s/%s\" because it is a mount point.", strna(parent_name), name);
2319
2320 if ((st.st_mode & S_IFMT) == S_IFDIR) {
2321 _cleanup_close_ int child_fd = -EBADF;
2322
2323 child_fd = openat(parent_fd, name, O_NOCTTY | O_CLOEXEC | O_DIRECTORY);
2324 if (child_fd < 0)
2325 return log_error_errno(errno, "Failed to open \"%s\" at \"%s\": %m", name, strna(parent_name));
2326
2327 r = rm_rf_children(TAKE_FD(child_fd), REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL, &st);
2328 if (r < 0)
2329 return log_error_errno(r, "Failed to remove contents of \"%s\" at \"%s\": %m", name, strna(parent_name));
2330
2331 r = unlinkat_harder(parent_fd, name, AT_REMOVEDIR, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
2332 } else
2333 r = unlinkat_harder(parent_fd, name, 0, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
2334 if (r < 0)
2335 return log_error_errno(r, "Failed to remove \"%s\" at \"%s\": %m", name, strna(parent_name));
2336
2337 /* This is covered by the log_notice "Wrong file type..." It is logged earlier because it gives
2338 * context to other error messages that might follow. */
2339 return -ENOENT;
2340 }
2341
2342 /* If child_mode is non-zero, rm_if_wrong_type_safe will be executed for the last path component. */
2343 static int mkdir_parents_rm_if_wrong_type(mode_t child_mode, const char *path) {
2344 _cleanup_close_ int parent_fd = -EBADF;
2345 struct stat parent_st;
2346 size_t path_len;
2347 int r;
2348
2349 assert(path);
2350 assert((child_mode & ~S_IFMT) == 0);
2351
2352 path_len = strlen(path);
2353
2354 if (!is_path(path))
2355 /* rm_if_wrong_type_safe already logs errors. */
2356 return child_mode != 0 ? rm_if_wrong_type_safe(child_mode, AT_FDCWD, NULL, path, AT_SYMLINK_NOFOLLOW) : 0;
2357
2358 if (child_mode != 0 && endswith(path, "/"))
2359 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2360 "Trailing path separators are only allowed if child_mode is not set; got \"%s\"", path);
2361
2362 /* Get the parent_fd and stat. */
2363 parent_fd = openat(AT_FDCWD, path_is_absolute(path) ? "/" : ".", O_NOCTTY | O_CLOEXEC | O_DIRECTORY);
2364 if (parent_fd < 0)
2365 return log_error_errno(errno, "Failed to open root: %m");
2366
2367 if (fstat(parent_fd, &parent_st) < 0)
2368 return log_error_errno(errno, "Failed to stat root: %m");
2369
2370 /* Check every parent directory in the path, except the last component */
2371 for (const char *e = path;;) {
2372 _cleanup_close_ int next_fd = -EBADF;
2373 char t[path_len + 1];
2374 const char *s;
2375
2376 /* Find the start of the next path component. */
2377 s = e + strspn(e, "/");
2378 /* Find the end of the next path component. */
2379 e = s + strcspn(s, "/");
2380
2381 /* Copy the path component to t so it can be a null terminated string. */
2382 *((char*) mempcpy(t, s, e - s)) = 0;
2383
2384 /* Is this the last component? If so, then check the type */
2385 if (*e == 0)
2386 return child_mode != 0 ? rm_if_wrong_type_safe(child_mode, parent_fd, &parent_st, t, AT_SYMLINK_NOFOLLOW) : 0;
2387
2388 r = rm_if_wrong_type_safe(S_IFDIR, parent_fd, &parent_st, t, 0);
2389 /* Remove dangling symlinks. */
2390 if (r == -ENOENT)
2391 r = rm_if_wrong_type_safe(S_IFDIR, parent_fd, &parent_st, t, AT_SYMLINK_NOFOLLOW);
2392 if (r == -ENOENT) {
2393 WITH_UMASK(0000)
2394 r = mkdirat_label(parent_fd, t, 0755);
2395 if (r < 0) {
2396 _cleanup_free_ char *parent_name = NULL;
2397
2398 (void) fd_get_path(parent_fd, &parent_name);
2399 return log_error_errno(r, "Failed to mkdir \"%s\" at \"%s\": %m", t, strnull(parent_name));
2400 }
2401 } else if (r < 0)
2402 /* rm_if_wrong_type_safe already logs errors. */
2403 return r;
2404
2405 next_fd = RET_NERRNO(openat(parent_fd, t, O_NOCTTY | O_CLOEXEC | O_DIRECTORY));
2406 if (next_fd < 0) {
2407 _cleanup_free_ char *parent_name = NULL;
2408
2409 (void) fd_get_path(parent_fd, &parent_name);
2410 return log_error_errno(next_fd, "Failed to open \"%s\" at \"%s\": %m", t, strnull(parent_name));
2411 }
2412 r = RET_NERRNO(fstat(next_fd, &parent_st));
2413 if (r < 0) {
2414 _cleanup_free_ char *parent_name = NULL;
2415
2416 (void) fd_get_path(parent_fd, &parent_name);
2417 return log_error_errno(r, "Failed to stat \"%s\" at \"%s\": %m", t, strnull(parent_name));
2418 }
2419
2420 close_and_replace(parent_fd, next_fd);
2421 }
2422 }
2423
2424 static int mkdir_parents_item(Item *i, mode_t child_mode) {
2425 int r;
2426 if (i->try_replace) {
2427 r = mkdir_parents_rm_if_wrong_type(child_mode, i->path);
2428 if (r < 0 && r != -ENOENT)
2429 return r;
2430 } else
2431 WITH_UMASK(0000)
2432 (void) mkdir_parents_label(i->path, 0755);
2433
2434 return 0;
2435 }
2436
2437 static int create_item(Item *i) {
2438 int r;
2439
2440 assert(i);
2441
2442 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
2443
2444 switch (i->type) {
2445
2446 case IGNORE_PATH:
2447 case IGNORE_DIRECTORY_PATH:
2448 case REMOVE_PATH:
2449 case RECURSIVE_REMOVE_PATH:
2450 return 0;
2451
2452 case TRUNCATE_FILE:
2453 case CREATE_FILE:
2454 r = mkdir_parents_item(i, S_IFREG);
2455 if (r < 0)
2456 return r;
2457
2458 if ((i->type == CREATE_FILE && i->append_or_force) || i->type == TRUNCATE_FILE)
2459 r = truncate_file(i, i->path);
2460 else
2461 r = create_file(i, i->path);
2462 if (r < 0)
2463 return r;
2464 break;
2465
2466 case COPY_FILES:
2467 r = mkdir_parents_item(i, 0);
2468 if (r < 0)
2469 return r;
2470
2471 r = copy_files(i);
2472 if (r < 0)
2473 return r;
2474 break;
2475
2476 case WRITE_FILE:
2477 r = glob_item(i, write_one_file);
2478 if (r < 0)
2479 return r;
2480
2481 break;
2482
2483 case CREATE_DIRECTORY:
2484 case TRUNCATE_DIRECTORY:
2485 r = mkdir_parents_item(i, S_IFDIR);
2486 if (r < 0)
2487 return r;
2488
2489 r = create_directory(i, i->path);
2490 if (r < 0)
2491 return r;
2492 break;
2493
2494 case CREATE_SUBVOLUME:
2495 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2496 case CREATE_SUBVOLUME_NEW_QUOTA:
2497 r = mkdir_parents_item(i, S_IFDIR);
2498 if (r < 0)
2499 return r;
2500
2501 r = create_subvolume(i, i->path);
2502 if (r < 0)
2503 return r;
2504 break;
2505
2506 case EMPTY_DIRECTORY:
2507 r = glob_item(i, empty_directory);
2508 if (r < 0)
2509 return r;
2510 break;
2511
2512 case CREATE_FIFO:
2513 r = mkdir_parents_item(i, S_IFIFO);
2514 if (r < 0)
2515 return r;
2516
2517 r = create_fifo(i);
2518 if (r < 0)
2519 return r;
2520 break;
2521
2522 case CREATE_SYMLINK:
2523 r = mkdir_parents_item(i, S_IFLNK);
2524 if (r < 0)
2525 return r;
2526
2527 r = create_symlink(i);
2528 if (r < 0)
2529 return r;
2530
2531 break;
2532
2533 case CREATE_BLOCK_DEVICE:
2534 case CREATE_CHAR_DEVICE:
2535 if (have_effective_cap(CAP_MKNOD) <= 0) {
2536 /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
2537 * case to avoid noise, and we don't support virtualized devices in containers anyway. */
2538
2539 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2540 return 0;
2541 }
2542
2543 r = mkdir_parents_item(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2544 if (r < 0)
2545 return r;
2546
2547 r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2548 if (r < 0)
2549 return r;
2550
2551 break;
2552
2553 case ADJUST_MODE:
2554 case RELABEL_PATH:
2555 r = glob_item(i, path_set_perms);
2556 if (r < 0)
2557 return r;
2558 break;
2559
2560 case RECURSIVE_RELABEL_PATH:
2561 r = glob_item_recursively(i, fd_set_perms);
2562 if (r < 0)
2563 return r;
2564 break;
2565
2566 case SET_XATTR:
2567 r = glob_item(i, path_set_xattrs);
2568 if (r < 0)
2569 return r;
2570 break;
2571
2572 case RECURSIVE_SET_XATTR:
2573 r = glob_item_recursively(i, fd_set_xattrs);
2574 if (r < 0)
2575 return r;
2576 break;
2577
2578 case SET_ACL:
2579 r = glob_item(i, path_set_acls);
2580 if (r < 0)
2581 return r;
2582 break;
2583
2584 case RECURSIVE_SET_ACL:
2585 r = glob_item_recursively(i, fd_set_acls);
2586 if (r < 0)
2587 return r;
2588 break;
2589
2590 case SET_ATTRIBUTE:
2591 r = glob_item(i, path_set_attribute);
2592 if (r < 0)
2593 return r;
2594 break;
2595
2596 case RECURSIVE_SET_ATTRIBUTE:
2597 r = glob_item_recursively(i, fd_set_attribute);
2598 if (r < 0)
2599 return r;
2600 break;
2601 }
2602
2603 return 0;
2604 }
2605
2606 static int remove_item_instance(Item *i, const char *instance, CreationMode creation) {
2607 int r;
2608
2609 assert(i);
2610
2611 switch (i->type) {
2612
2613 case REMOVE_PATH:
2614 if (remove(instance) < 0 && errno != ENOENT)
2615 return log_error_errno(errno, "rm(%s): %m", instance);
2616
2617 break;
2618
2619 case RECURSIVE_REMOVE_PATH:
2620 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2621 log_debug("rm -rf \"%s\"", instance);
2622 r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL);
2623 if (r < 0 && r != -ENOENT)
2624 return log_error_errno(r, "rm_rf(%s): %m", instance);
2625
2626 break;
2627
2628 default:
2629 assert_not_reached();
2630 }
2631
2632 return 0;
2633 }
2634
2635 static int remove_item(Item *i) {
2636 int r;
2637
2638 assert(i);
2639
2640 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
2641
2642 switch (i->type) {
2643
2644 case TRUNCATE_DIRECTORY:
2645 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2646 log_debug("rm -rf \"%s\"", i->path);
2647 r = rm_rf(i->path, REMOVE_PHYSICAL);
2648 if (r < 0 && r != -ENOENT)
2649 return log_error_errno(r, "rm_rf(%s): %m", i->path);
2650
2651 return 0;
2652
2653 case REMOVE_PATH:
2654 case RECURSIVE_REMOVE_PATH:
2655 return glob_item(i, remove_item_instance);
2656
2657 default:
2658 return 0;
2659 }
2660 }
2661
2662 static char *age_by_to_string(AgeBy ab, bool is_dir) {
2663 static const char ab_map[] = { 'a', 'b', 'c', 'm' };
2664 size_t j = 0;
2665 char *ret;
2666
2667 ret = new(char, ELEMENTSOF(ab_map) + 1);
2668 if (!ret)
2669 return NULL;
2670
2671 for (size_t i = 0; i < ELEMENTSOF(ab_map); i++)
2672 if (FLAGS_SET(ab, 1U << i))
2673 ret[j++] = is_dir ? ascii_toupper(ab_map[i]) : ab_map[i];
2674
2675 ret[j] = 0;
2676 return ret;
2677 }
2678
2679 static int clean_item_instance(
2680 Item *i,
2681 const char* instance,
2682 CreationMode creation) {
2683
2684 _cleanup_closedir_ DIR *d = NULL;
2685 STRUCT_STATX_DEFINE(sx);
2686 int mountpoint, r;
2687 usec_t cutoff, n;
2688
2689 assert(i);
2690
2691 if (!i->age_set)
2692 return 0;
2693
2694 n = now(CLOCK_REALTIME);
2695 if (n < i->age)
2696 return 0;
2697
2698 cutoff = n - i->age;
2699
2700 d = opendir_nomod(instance);
2701 if (!d) {
2702 if (IN_SET(errno, ENOENT, ENOTDIR)) {
2703 log_debug_errno(errno, "Directory \"%s\": %m", instance);
2704 return 0;
2705 }
2706
2707 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
2708 }
2709
2710 r = statx_fallback(dirfd(d), "", AT_EMPTY_PATH, STATX_MODE|STATX_INO|STATX_ATIME|STATX_MTIME, &sx);
2711 if (r < 0)
2712 return log_error_errno(r, "statx(%s) failed: %m", instance);
2713
2714 if (FLAGS_SET(sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT))
2715 mountpoint = FLAGS_SET(sx.stx_attributes, STATX_ATTR_MOUNT_ROOT);
2716 else {
2717 struct stat ps;
2718
2719 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
2720 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
2721
2722 mountpoint =
2723 sx.stx_dev_major != major(ps.st_dev) ||
2724 sx.stx_dev_minor != minor(ps.st_dev) ||
2725 sx.stx_ino != ps.st_ino;
2726 }
2727
2728 if (DEBUG_LOGGING) {
2729 _cleanup_free_ char *ab_f = NULL, *ab_d = NULL;
2730
2731 ab_f = age_by_to_string(i->age_by_file, false);
2732 if (!ab_f)
2733 return log_oom();
2734
2735 ab_d = age_by_to_string(i->age_by_dir, true);
2736 if (!ab_d)
2737 return log_oom();
2738
2739 log_debug("Cleanup threshold for %s \"%s\" is %s; age-by: %s%s",
2740 mountpoint ? "mount point" : "directory",
2741 instance,
2742 FORMAT_TIMESTAMP_STYLE(cutoff, TIMESTAMP_US),
2743 ab_f, ab_d);
2744 }
2745
2746 return dir_cleanup(i, instance, d,
2747 load_statx_timestamp_nsec(&sx.stx_atime),
2748 load_statx_timestamp_nsec(&sx.stx_mtime),
2749 cutoff * NSEC_PER_USEC,
2750 sx.stx_dev_major, sx.stx_dev_minor, mountpoint,
2751 MAX_DEPTH, i->keep_first_level,
2752 i->age_by_file, i->age_by_dir);
2753 }
2754
2755 static int clean_item(Item *i) {
2756 assert(i);
2757
2758 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
2759
2760 switch (i->type) {
2761 case CREATE_DIRECTORY:
2762 case CREATE_SUBVOLUME:
2763 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2764 case CREATE_SUBVOLUME_NEW_QUOTA:
2765 case TRUNCATE_DIRECTORY:
2766 case IGNORE_PATH:
2767 case COPY_FILES:
2768 clean_item_instance(i, i->path, CREATION_EXISTING);
2769 return 0;
2770 case EMPTY_DIRECTORY:
2771 case IGNORE_DIRECTORY_PATH:
2772 return glob_item(i, clean_item_instance);
2773 default:
2774 return 0;
2775 }
2776 }
2777
2778 static int process_item(Item *i, OperationMask operation) {
2779 OperationMask todo;
2780 _cleanup_free_ char *_path = NULL;
2781 const char *path;
2782 int r, q, p;
2783
2784 assert(i);
2785
2786 todo = operation & ~i->done;
2787 if (todo == 0) /* Everything already done? */
2788 return 0;
2789
2790 i->done |= operation;
2791
2792 path = i->path;
2793 if (string_is_glob(path)) {
2794 /* We can't easily check whether a glob matches any autofs path, so let's do the check only
2795 * for the non-glob part. */
2796
2797 r = glob_non_glob_prefix(path, &_path);
2798 if (r < 0 && r != -ENOENT)
2799 return log_debug_errno(r, "Failed to deglob path: %m");
2800 if (r >= 0)
2801 path = _path;
2802 }
2803
2804 r = chase(path, arg_root, CHASE_NO_AUTOFS|CHASE_NONEXISTENT|CHASE_WARN, NULL, NULL);
2805 if (r == -EREMOTE) {
2806 log_notice_errno(r, "Skipping %s", i->path); /* We log the configured path, to not confuse the user. */
2807 return 0;
2808 }
2809 if (r < 0)
2810 log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
2811
2812 r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(i) : 0;
2813 /* Failure can only be tolerated for create */
2814 if (i->allow_failure)
2815 r = 0;
2816
2817 q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(i) : 0;
2818 p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(i) : 0;
2819
2820 return r < 0 ? r :
2821 q < 0 ? q :
2822 p;
2823 }
2824
2825 static int process_item_array(ItemArray *array, OperationMask operation) {
2826 int r = 0;
2827 size_t n;
2828
2829 assert(array);
2830
2831 /* Create any parent first. */
2832 if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
2833 r = process_item_array(array->parent, operation & OPERATION_CREATE);
2834
2835 /* Clean up all children first */
2836 if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) {
2837 ItemArray *c;
2838
2839 SET_FOREACH(c, array->children) {
2840 int k;
2841
2842 k = process_item_array(c, operation & (OPERATION_REMOVE|OPERATION_CLEAN));
2843 if (k < 0 && r == 0)
2844 r = k;
2845 }
2846 }
2847
2848 for (n = 0; n < array->n_items; n++) {
2849 int k;
2850
2851 k = process_item(array->items + n, operation);
2852 if (k < 0 && r == 0)
2853 r = k;
2854 }
2855
2856 return r;
2857 }
2858
2859 static void item_free_contents(Item *i) {
2860 assert(i);
2861 free(i->path);
2862 free(i->argument);
2863 free(i->binary_argument);
2864 strv_free(i->xattrs);
2865
2866 #if HAVE_ACL
2867 if (i->acl_access)
2868 acl_free(i->acl_access);
2869
2870 if (i->acl_default)
2871 acl_free(i->acl_default);
2872 #endif
2873 }
2874
2875 static ItemArray* item_array_free(ItemArray *a) {
2876 size_t n;
2877
2878 if (!a)
2879 return NULL;
2880
2881 for (n = 0; n < a->n_items; n++)
2882 item_free_contents(a->items + n);
2883
2884 set_free(a->children);
2885 free(a->items);
2886 return mfree(a);
2887 }
2888
2889 static int item_compare(const Item *a, const Item *b) {
2890 /* Make sure that the ownership taking item is put first, so
2891 * that we first create the node, and then can adjust it */
2892
2893 if (takes_ownership(a->type) && !takes_ownership(b->type))
2894 return -1;
2895 if (!takes_ownership(a->type) && takes_ownership(b->type))
2896 return 1;
2897
2898 return CMP(a->type, b->type);
2899 }
2900
2901 static bool item_compatible(const Item *a, const Item *b) {
2902 assert(a);
2903 assert(b);
2904 assert(streq(a->path, b->path));
2905
2906 if (takes_ownership(a->type) && takes_ownership(b->type))
2907 /* check if the items are the same */
2908 return memcmp_nn(item_binary_argument(a), item_binary_argument_size(a),
2909 item_binary_argument(b), item_binary_argument_size(b)) == 0 &&
2910
2911 a->uid_set == b->uid_set &&
2912 a->uid == b->uid &&
2913 a->uid_only_create == b->uid_only_create &&
2914
2915 a->gid_set == b->gid_set &&
2916 a->gid == b->gid &&
2917 a->gid_only_create == b->gid_only_create &&
2918
2919 a->mode_set == b->mode_set &&
2920 a->mode == b->mode &&
2921 a->mode_only_create == b->mode_only_create &&
2922
2923 a->age_set == b->age_set &&
2924 a->age == b->age &&
2925
2926 a->age_by_file == b->age_by_file &&
2927 a->age_by_dir == b->age_by_dir &&
2928
2929 a->mask_perms == b->mask_perms &&
2930
2931 a->keep_first_level == b->keep_first_level &&
2932
2933 a->major_minor == b->major_minor;
2934
2935 return true;
2936 }
2937
2938 static bool should_include_path(const char *path) {
2939 STRV_FOREACH(prefix, arg_exclude_prefixes)
2940 if (path_startswith(path, *prefix)) {
2941 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
2942 path, *prefix);
2943 return false;
2944 }
2945
2946 STRV_FOREACH(prefix, arg_include_prefixes)
2947 if (path_startswith(path, *prefix)) {
2948 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
2949 return true;
2950 }
2951
2952 /* no matches, so we should include this path only if we have no allow list at all */
2953 if (strv_isempty(arg_include_prefixes))
2954 return true;
2955
2956 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
2957 return false;
2958 }
2959
2960 static int specifier_expansion_from_arg(const Specifier *specifier_table, Item *i) {
2961 int r;
2962
2963 assert(i);
2964
2965 if (!i->argument)
2966 return 0;
2967
2968 switch (i->type) {
2969 case COPY_FILES:
2970 case CREATE_SYMLINK:
2971 case CREATE_FILE:
2972 case TRUNCATE_FILE:
2973 case WRITE_FILE: {
2974 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
2975 ssize_t l;
2976
2977 l = cunescape(i->argument, 0, &unescaped);
2978 if (l < 0)
2979 return log_error_errno(l, "Failed to unescape parameter to write: %s", i->argument);
2980
2981 r = specifier_printf(unescaped, PATH_MAX-1, specifier_table, arg_root, NULL, &resolved);
2982 if (r < 0)
2983 return r;
2984
2985 return free_and_replace(i->argument, resolved);
2986 }
2987 case SET_XATTR:
2988 case RECURSIVE_SET_XATTR:
2989 STRV_FOREACH(xattr, i->xattrs) {
2990 _cleanup_free_ char *resolved = NULL;
2991
2992 r = specifier_printf(*xattr, SIZE_MAX, specifier_table, arg_root, NULL, &resolved);
2993 if (r < 0)
2994 return r;
2995
2996 free_and_replace(*xattr, resolved);
2997 }
2998 return 0;
2999
3000 default:
3001 return 0;
3002 }
3003 }
3004
3005 static int patch_var_run(const char *fname, unsigned line, char **path) {
3006 const char *k;
3007 char *n;
3008
3009 assert(path);
3010 assert(*path);
3011
3012 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
3013 * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
3014 * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
3015 * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
3016 * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
3017 * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
3018 * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
3019 * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
3020 * the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
3021
3022 k = path_startswith(*path, "/var/run/");
3023 if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
3024 return 0;
3025
3026 n = path_join("/run", k);
3027 if (!n)
3028 return log_oom();
3029
3030 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
3031 * there's no immediate need for action by the user. However, in the interest of making things less confusing
3032 * to the user, let's still inform the user that these snippets should really be updated. */
3033 log_syntax(NULL, LOG_NOTICE, fname, line, 0,
3034 "Line references path below legacy directory /var/run/, updating %s → %s; please update the tmpfiles.d/ drop-in file accordingly.",
3035 *path, n);
3036
3037 free_and_replace(*path, n);
3038
3039 return 0;
3040 }
3041
3042 static int find_uid(const char *user, uid_t *ret_uid, Hashmap **cache) {
3043 int r;
3044
3045 assert(user);
3046 assert(ret_uid);
3047
3048 /* First: parse as numeric UID string */
3049 r = parse_uid(user, ret_uid);
3050 if (r >= 0)
3051 return r;
3052
3053 /* Second: pass to NSS if we are running "online" */
3054 if (!arg_root)
3055 return get_user_creds(&user, ret_uid, NULL, NULL, NULL, 0);
3056
3057 /* Third, synthesize "root" unconditionally */
3058 if (streq(user, "root")) {
3059 *ret_uid = 0;
3060 return 0;
3061 }
3062
3063 /* Fourth: use fgetpwent() to read /etc/passwd directly, if we are "offline" */
3064 return name_to_uid_offline(arg_root, user, ret_uid, cache);
3065 }
3066
3067 static int find_gid(const char *group, gid_t *ret_gid, Hashmap **cache) {
3068 int r;
3069
3070 assert(group);
3071 assert(ret_gid);
3072
3073 /* First: parse as numeric GID string */
3074 r = parse_gid(group, ret_gid);
3075 if (r >= 0)
3076 return r;
3077
3078 /* Second: pass to NSS if we are running "online" */
3079 if (!arg_root)
3080 return get_group_creds(&group, ret_gid, 0);
3081
3082 /* Third, synthesize "root" unconditionally */
3083 if (streq(group, "root")) {
3084 *ret_gid = 0;
3085 return 0;
3086 }
3087
3088 /* Fourth: use fgetgrent() to read /etc/group directly, if we are "offline" */
3089 return name_to_gid_offline(arg_root, group, ret_gid, cache);
3090 }
3091
3092 static int parse_age_by_from_arg(const char *age_by_str, Item *item) {
3093 AgeBy ab_f = 0, ab_d = 0;
3094
3095 static const struct {
3096 char age_by_chr;
3097 AgeBy age_by_flag;
3098 } age_by_types[] = {
3099 { 'a', AGE_BY_ATIME },
3100 { 'b', AGE_BY_BTIME },
3101 { 'c', AGE_BY_CTIME },
3102 { 'm', AGE_BY_MTIME },
3103 };
3104
3105 assert(age_by_str);
3106 assert(item);
3107
3108 if (isempty(age_by_str))
3109 return -EINVAL;
3110
3111 for (const char *s = age_by_str; *s != 0; s++) {
3112 size_t i;
3113
3114 /* Ignore whitespace. */
3115 if (strchr(WHITESPACE, *s))
3116 continue;
3117
3118 for (i = 0; i < ELEMENTSOF(age_by_types); i++) {
3119 /* Check lower-case for files, upper-case for directories. */
3120 if (*s == age_by_types[i].age_by_chr) {
3121 ab_f |= age_by_types[i].age_by_flag;
3122 break;
3123 } else if (*s == ascii_toupper(age_by_types[i].age_by_chr)) {
3124 ab_d |= age_by_types[i].age_by_flag;
3125 break;
3126 }
3127 }
3128
3129 /* Invalid character. */
3130 if (i >= ELEMENTSOF(age_by_types))
3131 return -EINVAL;
3132 }
3133
3134 /* No match. */
3135 if (ab_f == 0 && ab_d == 0)
3136 return -EINVAL;
3137
3138 item->age_by_file = ab_f > 0 ? ab_f : AGE_BY_DEFAULT_FILE;
3139 item->age_by_dir = ab_d > 0 ? ab_d : AGE_BY_DEFAULT_DIR;
3140
3141 return 0;
3142 }
3143
3144 static bool is_duplicated_item(ItemArray *existing, const Item *i) {
3145
3146 assert(existing);
3147 assert(i);
3148
3149 for (size_t n = 0; n < existing->n_items; n++) {
3150 const Item *e = existing->items + n;
3151
3152 if (item_compatible(e, i))
3153 continue;
3154
3155 /* Only multiple 'w+' lines for the same path are allowed. */
3156 if (e->type != WRITE_FILE || !e->append_or_force ||
3157 i->type != WRITE_FILE || !i->append_or_force)
3158 return true;
3159 }
3160
3161 return false;
3162 }
3163
3164 static int parse_line(
3165 const char *fname,
3166 unsigned line,
3167 const char *buffer,
3168 bool *invalid_config,
3169 Hashmap **uid_cache,
3170 Hashmap **gid_cache) {
3171
3172 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
3173 _cleanup_(item_free_contents) Item i = {
3174 /* The "age-by" argument considers all file timestamp types by default. */
3175 .age_by_file = AGE_BY_DEFAULT_FILE,
3176 .age_by_dir = AGE_BY_DEFAULT_DIR,
3177 };
3178 ItemArray *existing;
3179 OrderedHashmap *h;
3180 int r, pos;
3181 bool append_or_force = false, boot = false, allow_failure = false, try_replace = false, unbase64 = false, from_cred = false;
3182
3183 assert(fname);
3184 assert(line >= 1);
3185 assert(buffer);
3186
3187 const Specifier specifier_table[] = {
3188 { 'a', specifier_architecture, NULL },
3189 { 'b', specifier_boot_id, NULL },
3190 { 'B', specifier_os_build_id, NULL },
3191 { 'H', specifier_hostname, NULL },
3192 { 'l', specifier_short_hostname, NULL },
3193 { 'm', specifier_machine_id, NULL },
3194 { 'o', specifier_os_id, NULL },
3195 { 'v', specifier_kernel_release, NULL },
3196 { 'w', specifier_os_version_id, NULL },
3197 { 'W', specifier_os_variant_id, NULL },
3198
3199 { 'h', specifier_user_home, NULL },
3200
3201 { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
3202 { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
3203 { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
3204 { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
3205
3206 COMMON_CREDS_SPECIFIERS(arg_runtime_scope),
3207 COMMON_TMP_SPECIFIERS,
3208 {}
3209 };
3210
3211 r = extract_many_words(
3212 &buffer,
3213 NULL,
3214 EXTRACT_UNQUOTE,
3215 &action,
3216 &path,
3217 &mode,
3218 &user,
3219 &group,
3220 &age,
3221 NULL);
3222 if (r < 0) {
3223 if (IN_SET(r, -EINVAL, -EBADSLT))
3224 /* invalid quoting and such or an unknown specifier */
3225 *invalid_config = true;
3226 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to parse line: %m");
3227 } else if (r < 2) {
3228 *invalid_config = true;
3229 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Syntax error.");
3230 }
3231
3232 if (!empty_or_dash(buffer)) {
3233 i.argument = strdup(buffer);
3234 if (!i.argument)
3235 return log_oom();
3236 }
3237
3238 if (isempty(action)) {
3239 *invalid_config = true;
3240 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Command too short '%s'.", action);
3241 }
3242
3243 for (pos = 1; action[pos]; pos++) {
3244 if (action[pos] == '!' && !boot)
3245 boot = true;
3246 else if (action[pos] == '+' && !append_or_force)
3247 append_or_force = true;
3248 else if (action[pos] == '-' && !allow_failure)
3249 allow_failure = true;
3250 else if (action[pos] == '=' && !try_replace)
3251 try_replace = true;
3252 else if (action[pos] == '~' && !unbase64)
3253 unbase64 = true;
3254 else if (action[pos] == '^' && !from_cred)
3255 from_cred = true;
3256 else {
3257 *invalid_config = true;
3258 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Unknown modifiers in command '%s'", action);
3259 }
3260 }
3261
3262 if (boot && !arg_boot) {
3263 log_syntax(NULL, LOG_DEBUG, fname, line, 0, "Ignoring entry %s \"%s\" because --boot is not specified.", action, path);
3264 return 0;
3265 }
3266
3267 i.type = action[0];
3268 i.append_or_force = append_or_force;
3269 i.allow_failure = allow_failure;
3270 i.try_replace = try_replace;
3271
3272 r = specifier_printf(path, PATH_MAX-1, specifier_table, arg_root, NULL, &i.path);
3273 if (ERRNO_IS_NOINFO(r))
3274 return log_unresolvable_specifier(fname, line);
3275 if (r < 0) {
3276 if (IN_SET(r, -EINVAL, -EBADSLT))
3277 *invalid_config = true;
3278 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to replace specifiers in '%s': %m", path);
3279 }
3280
3281 r = patch_var_run(fname, line, &i.path);
3282 if (r < 0)
3283 return r;
3284
3285 if (!path_is_absolute(i.path)) {
3286 *invalid_config = true;
3287 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3288 "Path '%s' not absolute.", i.path);
3289 }
3290
3291 path_simplify(i.path);
3292
3293 switch (i.type) {
3294
3295 case CREATE_DIRECTORY:
3296 case CREATE_SUBVOLUME:
3297 case CREATE_SUBVOLUME_INHERIT_QUOTA:
3298 case CREATE_SUBVOLUME_NEW_QUOTA:
3299 case EMPTY_DIRECTORY:
3300 case TRUNCATE_DIRECTORY:
3301 case CREATE_FIFO:
3302 case IGNORE_PATH:
3303 case IGNORE_DIRECTORY_PATH:
3304 case REMOVE_PATH:
3305 case RECURSIVE_REMOVE_PATH:
3306 case ADJUST_MODE:
3307 case RELABEL_PATH:
3308 case RECURSIVE_RELABEL_PATH:
3309 if (i.argument)
3310 log_syntax(NULL,
3311 LOG_WARNING,
3312 fname,
3313 line,
3314 0,
3315 "%c lines don't take argument fields, ignoring.",
3316 (char) i.type);
3317
3318 break;
3319
3320 case CREATE_FILE:
3321 case TRUNCATE_FILE:
3322 break;
3323
3324 case CREATE_SYMLINK:
3325 if (unbase64) {
3326 *invalid_config = true;
3327 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for symlink targets.");
3328 }
3329 break;
3330
3331 case WRITE_FILE:
3332 if (!i.argument) {
3333 *invalid_config = true;
3334 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Write file requires argument.");
3335 }
3336 break;
3337
3338 case COPY_FILES:
3339 if (unbase64) {
3340 *invalid_config = true;
3341 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for copy sources.");
3342 }
3343 break;
3344
3345 case CREATE_CHAR_DEVICE:
3346 case CREATE_BLOCK_DEVICE:
3347 if (unbase64) {
3348 *invalid_config = true;
3349 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for device node creation.");
3350 }
3351
3352 if (!i.argument) {
3353 *invalid_config = true;
3354 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Device file requires argument.");
3355 }
3356
3357 r = parse_devnum(i.argument, &i.major_minor);
3358 if (r < 0) {
3359 *invalid_config = true;
3360 return log_syntax(NULL, LOG_ERR, fname, line, r, "Can't parse device file major/minor '%s'.", i.argument);
3361 }
3362
3363 break;
3364
3365 case SET_XATTR:
3366 case RECURSIVE_SET_XATTR:
3367 if (unbase64) {
3368 *invalid_config = true;
3369 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for extended attributes.");
3370 }
3371 if (!i.argument) {
3372 *invalid_config = true;
3373 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3374 "Set extended attribute requires argument.");
3375 }
3376 r = parse_xattrs_from_arg(&i);
3377 if (r < 0)
3378 return r;
3379 break;
3380
3381 case SET_ACL:
3382 case RECURSIVE_SET_ACL:
3383 if (unbase64) {
3384 *invalid_config = true;
3385 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for ACLs.");
3386 }
3387 if (!i.argument) {
3388 *invalid_config = true;
3389 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3390 "Set ACLs requires argument.");
3391 }
3392 r = parse_acls_from_arg(&i);
3393 if (r < 0)
3394 return r;
3395 break;
3396
3397 case SET_ATTRIBUTE:
3398 case RECURSIVE_SET_ATTRIBUTE:
3399 if (unbase64) {
3400 *invalid_config = true;
3401 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for file attributes.");
3402 }
3403 if (!i.argument) {
3404 *invalid_config = true;
3405 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3406 "Set file attribute requires argument.");
3407 }
3408 r = parse_attribute_from_arg(&i);
3409 if (IN_SET(r, -EINVAL, -EBADSLT))
3410 *invalid_config = true;
3411 if (r < 0)
3412 return r;
3413 break;
3414
3415 default:
3416 *invalid_config = true;
3417 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3418 "Unknown command type '%c'.", (char) i.type);
3419 }
3420
3421 if (!should_include_path(i.path))
3422 return 0;
3423
3424 if (!unbase64) {
3425 /* Do specifier expansion except if base64 mode is enabled */
3426 r = specifier_expansion_from_arg(specifier_table, &i);
3427 if (ERRNO_IS_NOINFO(r))
3428 return log_unresolvable_specifier(fname, line);
3429 if (r < 0) {
3430 if (IN_SET(r, -EINVAL, -EBADSLT))
3431 *invalid_config = true;
3432 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to substitute specifiers in argument: %m");
3433 }
3434 }
3435
3436 switch (i.type) {
3437 case CREATE_SYMLINK:
3438 if (!i.argument) {
3439 i.argument = path_join("/usr/share/factory", i.path);
3440 if (!i.argument)
3441 return log_oom();
3442 }
3443 break;
3444
3445 case COPY_FILES:
3446 if (!i.argument) {
3447 i.argument = path_join("/usr/share/factory", i.path);
3448 if (!i.argument)
3449 return log_oom();
3450 } else if (!path_is_absolute(i.argument)) {
3451 *invalid_config = true;
3452 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Source path '%s' is not absolute.", i.argument);
3453
3454 }
3455
3456 if (!empty_or_root(arg_root)) {
3457 char *p;
3458
3459 p = path_join(arg_root, i.argument);
3460 if (!p)
3461 return log_oom();
3462 free_and_replace(i.argument, p);
3463 }
3464
3465 path_simplify(i.argument);
3466
3467 if (laccess(i.argument, F_OK) == -ENOENT) {
3468 /* Silently skip over lines where the source file is missing. */
3469 log_syntax(NULL, LOG_DEBUG, fname, line, 0, "Copy source path '%s' does not exist, skipping line.", i.argument);
3470 return 0;
3471 }
3472
3473 break;
3474
3475 default:
3476 break;
3477 }
3478
3479 if (from_cred) {
3480 if (!i.argument)
3481 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EINVAL), "Reading from credential requested, but no credential name specified.");
3482 if (!credential_name_valid(i.argument))
3483 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EINVAL), "Credential name not valid: %s", i.argument);
3484
3485 r = read_credential(i.argument, &i.binary_argument, &i.binary_argument_size);
3486 if (IN_SET(r, -ENXIO, -ENOENT)) {
3487 /* Silently skip over lines that have no credentials passed */
3488 log_syntax(NULL, LOG_DEBUG, fname, line, 0,
3489 "Credential '%s' not specified, skipping line.", i.argument);
3490 return 0;
3491 }
3492 if (r < 0)
3493 return log_error_errno(r, "Failed to read credential '%s': %m", i.argument);
3494 }
3495
3496 /* If base64 decoding is requested, do so now */
3497 if (unbase64 && item_binary_argument(&i)) {
3498 _cleanup_free_ void *data = NULL;
3499 size_t data_size = 0;
3500
3501 r = unbase64mem(item_binary_argument(&i), item_binary_argument_size(&i), &data, &data_size);
3502 if (r < 0)
3503 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to base64 decode specified argument '%s': %m", i.argument);
3504
3505 free_and_replace(i.binary_argument, data);
3506 i.binary_argument_size = data_size;
3507 }
3508
3509 if (!empty_or_root(arg_root)) {
3510 char *p;
3511
3512 p = path_join(arg_root, i.path);
3513 if (!p)
3514 return log_oom();
3515 free_and_replace(i.path, p);
3516 }
3517
3518 if (!empty_or_dash(user)) {
3519 const char *u;
3520
3521 u = startswith(user, ":");
3522 if (u)
3523 i.uid_only_create = true;
3524 else
3525 u = user;
3526
3527 r = find_uid(u, &i.uid, uid_cache);
3528 if (r < 0) {
3529 *invalid_config = true;
3530 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve user '%s': %m", u);
3531 }
3532
3533 i.uid_set = true;
3534 }
3535
3536 if (!empty_or_dash(group)) {
3537 const char *g;
3538
3539 g = startswith(group, ":");
3540 if (g)
3541 i.gid_only_create = true;
3542 else
3543 g = group;
3544
3545 r = find_gid(g, &i.gid, gid_cache);
3546 if (r < 0) {
3547 *invalid_config = true;
3548 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve group '%s'.", g);
3549 }
3550
3551 i.gid_set = true;
3552 }
3553
3554 if (!empty_or_dash(mode)) {
3555 const char *mm;
3556 unsigned m;
3557
3558 for (mm = mode;; mm++) {
3559 if (*mm == '~')
3560 i.mask_perms = true;
3561 else if (*mm == ':')
3562 i.mode_only_create = true;
3563 else
3564 break;
3565 }
3566
3567 r = parse_mode(mm, &m);
3568 if (r < 0) {
3569 *invalid_config = true;
3570 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid mode '%s'.", mode);
3571 }
3572
3573 i.mode = m;
3574 i.mode_set = true;
3575 } else
3576 i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
3577
3578 if (!empty_or_dash(age)) {
3579 const char *a = age;
3580 _cleanup_free_ char *seconds = NULL, *age_by = NULL;
3581
3582 if (*a == '~') {
3583 i.keep_first_level = true;
3584 a++;
3585 }
3586
3587 /* Format: "age-by:age"; where age-by is "[abcmABCM]+". */
3588 r = split_pair(a, ":", &age_by, &seconds);
3589 if (r == -ENOMEM)
3590 return log_oom();
3591 if (r < 0 && r != -EINVAL)
3592 return log_error_errno(r, "Failed to parse age-by for '%s': %m", age);
3593 if (r >= 0) {
3594 /* We found a ":", parse the "age-by" part. */
3595 r = parse_age_by_from_arg(age_by, &i);
3596 if (r == -ENOMEM)
3597 return log_oom();
3598 if (r < 0) {
3599 *invalid_config = true;
3600 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age-by '%s'.", age_by);
3601 }
3602
3603 /* For parsing the "age" part, after the ":". */
3604 a = seconds;
3605 }
3606
3607 r = parse_sec(a, &i.age);
3608 if (r < 0) {
3609 *invalid_config = true;
3610 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age '%s'.", a);
3611 }
3612
3613 i.age_set = true;
3614 }
3615
3616 h = needs_glob(i.type) ? globs : items;
3617
3618 existing = ordered_hashmap_get(h, i.path);
3619 if (existing) {
3620 if (is_duplicated_item(existing, &i)) {
3621 log_syntax(NULL, LOG_NOTICE, fname, line, 0,
3622 "Duplicate line for path \"%s\", ignoring.", i.path);
3623 return 0;
3624 }
3625 } else {
3626 existing = new0(ItemArray, 1);
3627 if (!existing)
3628 return log_oom();
3629
3630 r = ordered_hashmap_put(h, i.path, existing);
3631 if (r < 0) {
3632 free(existing);
3633 return log_oom();
3634 }
3635 }
3636
3637 if (!GREEDY_REALLOC(existing->items, existing->n_items + 1))
3638 return log_oom();
3639
3640 existing->items[existing->n_items++] = i;
3641 i = (struct Item) {};
3642
3643 /* Sort item array, to enforce stable ordering of application */
3644 typesafe_qsort(existing->items, existing->n_items, item_compare);
3645
3646 return 0;
3647 }
3648
3649 static int cat_config(char **config_dirs, char **args) {
3650 _cleanup_strv_free_ char **files = NULL;
3651 int r;
3652
3653 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
3654 if (r < 0)
3655 return r;
3656
3657 return cat_files(NULL, files, 0);
3658 }
3659
3660 static int exclude_default_prefixes(void) {
3661 int r;
3662
3663 /* Provide an easy way to exclude virtual/memory file systems from what we do here. Useful in
3664 * combination with --root= where we probably don't want to apply stuff to these dirs as they are
3665 * likely over-mounted if the root directory is actually used, and it wouldbe less than ideal to have
3666 * all kinds of files created/adjusted underneath these mount points. */
3667
3668 r = strv_extend_strv(
3669 &arg_exclude_prefixes,
3670 STRV_MAKE("/dev",
3671 "/proc",
3672 "/run",
3673 "/sys"),
3674 true);
3675 if (r < 0)
3676 return log_oom();
3677
3678 return 0;
3679 }
3680
3681 static int help(void) {
3682 _cleanup_free_ char *link = NULL;
3683 int r;
3684
3685 r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
3686 if (r < 0)
3687 return log_oom();
3688
3689 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n"
3690 "\n%sCreates, deletes and cleans up volatile and temporary files and directories.%s\n\n"
3691 " -h --help Show this help\n"
3692 " --user Execute user configuration\n"
3693 " --version Show package version\n"
3694 " --cat-config Show configuration files\n"
3695 " --create Create marked files/directories\n"
3696 " --clean Clean up marked directories\n"
3697 " --remove Remove marked files/directories\n"
3698 " --boot Execute actions only safe at boot\n"
3699 " --prefix=PATH Only apply rules with the specified prefix\n"
3700 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
3701 " -E Ignore rules prefixed with /dev, /proc, /run, /sys\n"
3702 " --root=PATH Operate on an alternate filesystem root\n"
3703 " --image=PATH Operate on disk image as filesystem root\n"
3704 " --image-policy=POLICY Specify disk image dissection policy\n"
3705 " --replace=PATH Treat arguments as replacement for PATH\n"
3706 " --no-pager Do not pipe output into a pager\n"
3707 "\nSee the %s for details.\n",
3708 program_invocation_short_name,
3709 ansi_highlight(),
3710 ansi_normal(),
3711 link);
3712
3713 return 0;
3714 }
3715
3716 static int parse_argv(int argc, char *argv[]) {
3717
3718 enum {
3719 ARG_VERSION = 0x100,
3720 ARG_CAT_CONFIG,
3721 ARG_USER,
3722 ARG_CREATE,
3723 ARG_CLEAN,
3724 ARG_REMOVE,
3725 ARG_BOOT,
3726 ARG_PREFIX,
3727 ARG_EXCLUDE_PREFIX,
3728 ARG_ROOT,
3729 ARG_IMAGE,
3730 ARG_REPLACE,
3731 ARG_NO_PAGER,
3732 ARG_IMAGE_POLICY,
3733 };
3734
3735 static const struct option options[] = {
3736 { "help", no_argument, NULL, 'h' },
3737 { "user", no_argument, NULL, ARG_USER },
3738 { "version", no_argument, NULL, ARG_VERSION },
3739 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
3740 { "create", no_argument, NULL, ARG_CREATE },
3741 { "clean", no_argument, NULL, ARG_CLEAN },
3742 { "remove", no_argument, NULL, ARG_REMOVE },
3743 { "boot", no_argument, NULL, ARG_BOOT },
3744 { "prefix", required_argument, NULL, ARG_PREFIX },
3745 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
3746 { "root", required_argument, NULL, ARG_ROOT },
3747 { "image", required_argument, NULL, ARG_IMAGE },
3748 { "replace", required_argument, NULL, ARG_REPLACE },
3749 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
3750 { "image-policy", required_argument, NULL, ARG_IMAGE_POLICY },
3751 {}
3752 };
3753
3754 int c, r;
3755
3756 assert(argc >= 0);
3757 assert(argv);
3758
3759 while ((c = getopt_long(argc, argv, "hE", options, NULL)) >= 0)
3760
3761 switch (c) {
3762
3763 case 'h':
3764 return help();
3765
3766 case ARG_VERSION:
3767 return version();
3768
3769 case ARG_CAT_CONFIG:
3770 arg_cat_config = true;
3771 break;
3772
3773 case ARG_USER:
3774 arg_runtime_scope = RUNTIME_SCOPE_USER;
3775 break;
3776
3777 case ARG_CREATE:
3778 arg_operation |= OPERATION_CREATE;
3779 break;
3780
3781 case ARG_CLEAN:
3782 arg_operation |= OPERATION_CLEAN;
3783 break;
3784
3785 case ARG_REMOVE:
3786 arg_operation |= OPERATION_REMOVE;
3787 break;
3788
3789 case ARG_BOOT:
3790 arg_boot = true;
3791 break;
3792
3793 case ARG_PREFIX:
3794 if (strv_push(&arg_include_prefixes, optarg) < 0)
3795 return log_oom();
3796 break;
3797
3798 case ARG_EXCLUDE_PREFIX:
3799 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
3800 return log_oom();
3801 break;
3802
3803 case ARG_ROOT:
3804 r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_root);
3805 if (r < 0)
3806 return r;
3807 break;
3808
3809 case ARG_IMAGE:
3810 #ifdef STANDALONE
3811 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
3812 "This systemd-tmpfiles version is compiled without support for --image=.");
3813 #else
3814 r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_image);
3815 if (r < 0)
3816 return r;
3817 #endif
3818 /* Imply -E here since it makes little sense to create files persistently in the /run mountpoint of a disk image */
3819 _fallthrough_;
3820
3821 case 'E':
3822 r = exclude_default_prefixes();
3823 if (r < 0)
3824 return r;
3825
3826 break;
3827
3828 case ARG_REPLACE:
3829 if (!path_is_absolute(optarg) ||
3830 !endswith(optarg, ".conf"))
3831 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3832 "The argument to --replace= must an absolute path to a config file");
3833
3834 arg_replace = optarg;
3835 break;
3836
3837 case ARG_NO_PAGER:
3838 arg_pager_flags |= PAGER_DISABLE;
3839 break;
3840
3841 case ARG_IMAGE_POLICY: {
3842 _cleanup_(image_policy_freep) ImagePolicy *p = NULL;
3843
3844 r = image_policy_from_string(optarg, &p);
3845 if (r < 0)
3846 return log_error_errno(r, "Failed to parse image policy: %s", optarg);
3847
3848 image_policy_free(arg_image_policy);
3849 arg_image_policy = TAKE_PTR(p);
3850 break;
3851 }
3852 case '?':
3853 return -EINVAL;
3854
3855 default:
3856 assert_not_reached();
3857 }
3858
3859 if (arg_operation == 0 && !arg_cat_config)
3860 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3861 "You need to specify at least one of --clean, --create or --remove.");
3862
3863 if (arg_replace && arg_cat_config)
3864 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3865 "Option --replace= is not supported with --cat-config");
3866
3867 if (arg_replace && optind >= argc)
3868 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3869 "When --replace= is given, some configuration items must be specified");
3870
3871 if (arg_root && arg_runtime_scope == RUNTIME_SCOPE_USER)
3872 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3873 "Combination of --user and --root= is not supported.");
3874
3875 if (arg_image && arg_root)
3876 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Please specify either --root= or --image=, the combination of both is not supported.");
3877
3878 return 1;
3879 }
3880
3881 static int read_config_file(
3882 char **config_dirs,
3883 const char *fn,
3884 bool ignore_enoent,
3885 bool *invalid_config) {
3886
3887 _cleanup_(hashmap_freep) Hashmap *uid_cache = NULL, *gid_cache = NULL;
3888 _cleanup_fclose_ FILE *_f = NULL;
3889 _cleanup_free_ char *pp = NULL;
3890 unsigned v = 0;
3891 FILE *f;
3892 ItemArray *ia;
3893 int r = 0;
3894
3895 assert(fn);
3896
3897 if (streq(fn, "-")) {
3898 log_debug("Reading config from stdin%s", special_glyph(SPECIAL_GLYPH_ELLIPSIS));
3899 fn = "<stdin>";
3900 f = stdin;
3901 } else {
3902 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f, &pp);
3903 if (r < 0) {
3904 if (ignore_enoent && r == -ENOENT) {
3905 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
3906 return 0;
3907 }
3908
3909 return log_error_errno(r, "Failed to open '%s': %m", fn);
3910 }
3911
3912 log_debug("Reading config file \"%s\"%s", pp, special_glyph(SPECIAL_GLYPH_ELLIPSIS));
3913 fn = pp;
3914 f = _f;
3915 }
3916
3917 for (;;) {
3918 _cleanup_free_ char *line = NULL;
3919 bool invalid_line = false;
3920 char *l;
3921 int k;
3922
3923 k = read_line(f, LONG_LINE_MAX, &line);
3924 if (k < 0)
3925 return log_error_errno(k, "Failed to read '%s': %m", fn);
3926 if (k == 0)
3927 break;
3928
3929 v++;
3930
3931 l = strstrip(line);
3932 if (IN_SET(*l, 0, '#'))
3933 continue;
3934
3935 k = parse_line(fn, v, l, &invalid_line, &uid_cache, &gid_cache);
3936 if (k < 0) {
3937 if (invalid_line)
3938 /* Allow reporting with a special code if the caller requested this */
3939 *invalid_config = true;
3940 else if (r == 0)
3941 /* The first error becomes our return value */
3942 r = k;
3943 }
3944 }
3945
3946 /* we have to determine age parameter for each entry of type X */
3947 ORDERED_HASHMAP_FOREACH(ia, globs)
3948 for (size_t ni = 0; ni < ia->n_items; ni++) {
3949 ItemArray *ja;
3950 Item *i = ia->items + ni, *candidate_item = NULL;
3951
3952 if (i->type != IGNORE_DIRECTORY_PATH)
3953 continue;
3954
3955 ORDERED_HASHMAP_FOREACH(ja, items)
3956 for (size_t nj = 0; nj < ja->n_items; nj++) {
3957 Item *j = ja->items + nj;
3958
3959 if (!IN_SET(j->type, CREATE_DIRECTORY,
3960 TRUNCATE_DIRECTORY,
3961 CREATE_SUBVOLUME,
3962 CREATE_SUBVOLUME_INHERIT_QUOTA,
3963 CREATE_SUBVOLUME_NEW_QUOTA))
3964 continue;
3965
3966 if (path_equal(j->path, i->path)) {
3967 candidate_item = j;
3968 break;
3969 }
3970
3971 if (candidate_item
3972 ? (path_startswith(j->path, candidate_item->path) && fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)
3973 : path_startswith(i->path, j->path) != NULL)
3974 candidate_item = j;
3975 }
3976
3977 if (candidate_item && candidate_item->age_set) {
3978 i->age = candidate_item->age;
3979 i->age_set = true;
3980 }
3981 }
3982
3983 if (ferror(f)) {
3984 log_error_errno(errno, "Failed to read from file %s: %m", fn);
3985 if (r == 0)
3986 r = -EIO;
3987 }
3988
3989 return r;
3990 }
3991
3992 static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
3993 int r;
3994
3995 STRV_FOREACH(arg, args) {
3996 r = read_config_file(config_dirs, *arg, false, invalid_config);
3997 if (r < 0)
3998 return r;
3999 }
4000
4001 return 0;
4002 }
4003
4004 static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
4005 _cleanup_strv_free_ char **files = NULL;
4006 _cleanup_free_ char *p = NULL;
4007 int r;
4008
4009 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
4010 if (r < 0)
4011 return r;
4012
4013 STRV_FOREACH(f, files)
4014 if (p && path_equal(*f, p)) {
4015 log_debug("Parsing arguments at position \"%s\"%s", *f, special_glyph(SPECIAL_GLYPH_ELLIPSIS));
4016
4017 r = parse_arguments(config_dirs, args, invalid_config);
4018 if (r < 0)
4019 return r;
4020 } else
4021 /* Just warn, ignore result otherwise.
4022 * read_config_file() has some debug output, so no need to print anything. */
4023 (void) read_config_file(config_dirs, *f, true, invalid_config);
4024
4025 return 0;
4026 }
4027
4028 static int read_credential_lines(bool *invalid_config) {
4029 _cleanup_free_ char *j = NULL;
4030 const char *d;
4031 int r;
4032
4033 r = get_credentials_dir(&d);
4034 if (r == -ENXIO)
4035 return 0;
4036 if (r < 0)
4037 return log_error_errno(r, "Failed to get credentials directory: %m");
4038
4039 j = path_join(d, "tmpfiles.extra");
4040 if (!j)
4041 return log_oom();
4042
4043 (void) read_config_file(/* config_dirs= */ NULL, j, /* ignore_enoent= */ true, invalid_config);
4044 return 0;
4045 }
4046
4047 static int link_parent(ItemArray *a) {
4048 const char *path;
4049 char *prefix;
4050 int r;
4051
4052 assert(a);
4053
4054 /* Finds the closest "parent" item array for the specified item array. Then registers the specified item array
4055 * as child of it, and fills the parent in, linking them both ways. This allows us to later create parents
4056 * before their children, and clean up/remove children before their parents. */
4057
4058 if (a->n_items <= 0)
4059 return 0;
4060
4061 path = a->items[0].path;
4062 prefix = newa(char, strlen(path) + 1);
4063 PATH_FOREACH_PREFIX(prefix, path) {
4064 ItemArray *j;
4065
4066 j = ordered_hashmap_get(items, prefix);
4067 if (!j)
4068 j = ordered_hashmap_get(globs, prefix);
4069 if (j) {
4070 r = set_ensure_put(&j->children, NULL, a);
4071 if (r < 0)
4072 return log_oom();
4073
4074 a->parent = j;
4075 return 1;
4076 }
4077 }
4078
4079 return 0;
4080 }
4081
4082 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
4083 ItemArray, item_array_free);
4084
4085 static int run(int argc, char *argv[]) {
4086 #ifndef STANDALONE
4087 _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL;
4088 _cleanup_(umount_and_rmdir_and_freep) char *unlink_dir = NULL;
4089 #endif
4090 _cleanup_strv_free_ char **config_dirs = NULL;
4091 bool invalid_config = false;
4092 ItemArray *a;
4093 enum {
4094 PHASE_REMOVE_AND_CLEAN,
4095 PHASE_CREATE,
4096 _PHASE_MAX
4097 } phase;
4098 int r, k;
4099
4100 r = parse_argv(argc, argv);
4101 if (r <= 0)
4102 return r;
4103
4104 log_setup();
4105
4106 /* We require /proc/ for a lot of our operations, i.e. for adjusting access modes, for anything
4107 * SELinux related, for recursive operation, for xattr, acl and chattr handling, for btrfs stuff and
4108 * a lot more. It's probably the majority of invocations where /proc/ is required. Since people
4109 * apparently invoke it without anyway and are surprised about the failures, let's catch this early
4110 * and output a nice and friendly warning. */
4111 if (proc_mounted() == 0)
4112 return log_error_errno(SYNTHETIC_ERRNO(ENOSYS),
4113 "/proc/ is not mounted, but required for successful operation of systemd-tmpfiles. "
4114 "Please mount /proc/. Alternatively, consider using the --root= or --image= switches.");
4115
4116 /* Descending down file system trees might take a lot of fds */
4117 (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
4118
4119 switch (arg_runtime_scope) {
4120
4121 case RUNTIME_SCOPE_USER:
4122 r = user_config_paths(&config_dirs);
4123 if (r < 0)
4124 return log_error_errno(r, "Failed to initialize configuration directory list: %m");
4125 break;
4126
4127 case RUNTIME_SCOPE_SYSTEM:
4128 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
4129 if (!config_dirs)
4130 return log_oom();
4131 break;
4132
4133 default:
4134 assert_not_reached();
4135 }
4136
4137 if (DEBUG_LOGGING) {
4138 _cleanup_free_ char *t = NULL;
4139
4140 STRV_FOREACH(i, config_dirs) {
4141 _cleanup_free_ char *j = NULL;
4142
4143 j = path_join(arg_root, *i);
4144 if (!j)
4145 return log_oom();
4146
4147 if (!strextend(&t, "\n\t", j))
4148 return log_oom();
4149 }
4150
4151 log_debug("Looking for configuration files in (higher priority first):%s", t);
4152 }
4153
4154 if (arg_cat_config) {
4155 pager_open(arg_pager_flags);
4156
4157 return cat_config(config_dirs, argv + optind);
4158 }
4159
4160 umask(0022);
4161
4162 r = mac_selinux_init();
4163 if (r < 0)
4164 return r;
4165
4166 #ifndef STANDALONE
4167 if (arg_image) {
4168 assert(!arg_root);
4169
4170 r = mount_image_privately_interactively(
4171 arg_image,
4172 arg_image_policy,
4173 DISSECT_IMAGE_GENERIC_ROOT |
4174 DISSECT_IMAGE_REQUIRE_ROOT |
4175 DISSECT_IMAGE_VALIDATE_OS |
4176 DISSECT_IMAGE_RELAX_VAR_CHECK |
4177 DISSECT_IMAGE_FSCK |
4178 DISSECT_IMAGE_GROWFS,
4179 &unlink_dir,
4180 /* ret_dir_fd= */ NULL,
4181 &loop_device);
4182 if (r < 0)
4183 return r;
4184
4185 arg_root = strdup(unlink_dir);
4186 if (!arg_root)
4187 return log_oom();
4188 }
4189 #else
4190 assert(!arg_image);
4191 #endif
4192
4193 items = ordered_hashmap_new(&item_array_hash_ops);
4194 globs = ordered_hashmap_new(&item_array_hash_ops);
4195 if (!items || !globs)
4196 return log_oom();
4197
4198 /* If command line arguments are specified along with --replace, read all
4199 * configuration files and insert the positional arguments at the specified
4200 * place. Otherwise, if command line arguments are specified, execute just
4201 * them, and finally, without --replace= or any positional arguments, just
4202 * read configuration and execute it.
4203 */
4204 if (arg_replace || optind >= argc)
4205 r = read_config_files(config_dirs, argv + optind, &invalid_config);
4206 else
4207 r = parse_arguments(config_dirs, argv + optind, &invalid_config);
4208 if (r < 0)
4209 return r;
4210
4211 r = read_credential_lines(&invalid_config);
4212 if (r < 0)
4213 return r;
4214
4215 /* Let's now link up all child/parent relationships */
4216 ORDERED_HASHMAP_FOREACH(a, items) {
4217 r = link_parent(a);
4218 if (r < 0)
4219 return r;
4220 }
4221 ORDERED_HASHMAP_FOREACH(a, globs) {
4222 r = link_parent(a);
4223 if (r < 0)
4224 return r;
4225 }
4226
4227 /* If multiple operations are requested, let's first run the remove/clean operations, and only then the create
4228 * operations. i.e. that we first clean out the platform we then build on. */
4229 for (phase = 0; phase < _PHASE_MAX; phase++) {
4230 OperationMask op;
4231
4232 if (phase == PHASE_REMOVE_AND_CLEAN)
4233 op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
4234 else if (phase == PHASE_CREATE)
4235 op = arg_operation & OPERATION_CREATE;
4236 else
4237 assert_not_reached();
4238
4239 if (op == 0) /* Nothing requested in this phase */
4240 continue;
4241
4242 /* The non-globbing ones usually create things, hence we apply them first */
4243 ORDERED_HASHMAP_FOREACH(a, items) {
4244 k = process_item_array(a, op);
4245 if (k < 0 && r >= 0)
4246 r = k;
4247 }
4248
4249 /* The globbing ones usually alter things, hence we apply them second. */
4250 ORDERED_HASHMAP_FOREACH(a, globs) {
4251 k = process_item_array(a, op);
4252 if (k < 0 && r >= 0)
4253 r = k;
4254 }
4255 }
4256
4257 if (ERRNO_IS_RESOURCE(r))
4258 return r;
4259 if (invalid_config)
4260 return EX_DATAERR;
4261 if (r < 0)
4262 return EX_CANTCREAT;
4263 return 0;
4264 }
4265
4266 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
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