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Merge pull request #29695 from poettering/repart-reduce-global-vars
[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-util.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_access_exec;
142 acl_t acl_default;
143 #endif
144 uid_t uid;
145 gid_t gid;
146 mode_t mode;
147 usec_t age;
148 AgeBy age_by_file, age_by_dir;
149
150 dev_t major_minor;
151 unsigned attribute_value;
152 unsigned attribute_mask;
153
154 bool uid_set:1;
155 bool gid_set:1;
156 bool mode_set:1;
157 bool uid_only_create:1;
158 bool gid_only_create:1;
159 bool mode_only_create:1;
160 bool age_set:1;
161 bool mask_perms:1;
162 bool attribute_set:1;
163
164 bool keep_first_level:1;
165
166 bool append_or_force:1;
167
168 bool allow_failure:1;
169
170 bool try_replace:1;
171
172 OperationMask done;
173 } Item;
174
175 typedef struct ItemArray {
176 Item *items;
177 size_t n_items;
178
179 struct ItemArray *parent;
180 Set *children;
181 } ItemArray;
182
183 typedef enum DirectoryType {
184 DIRECTORY_RUNTIME,
185 DIRECTORY_STATE,
186 DIRECTORY_CACHE,
187 DIRECTORY_LOGS,
188 _DIRECTORY_TYPE_MAX,
189 } DirectoryType;
190
191 typedef enum {
192 CREATION_NORMAL,
193 CREATION_EXISTING,
194 CREATION_FORCE,
195 _CREATION_MODE_MAX,
196 _CREATION_MODE_INVALID = -EINVAL,
197 } CreationMode;
198
199 static CatFlags arg_cat_flags = CAT_CONFIG_OFF;
200 static RuntimeScope arg_runtime_scope = RUNTIME_SCOPE_SYSTEM;
201 static OperationMask arg_operation = 0;
202 static bool arg_boot = false;
203 static bool arg_graceful = false;
204 static PagerFlags arg_pager_flags = 0;
205
206 static char **arg_include_prefixes = NULL;
207 static char **arg_exclude_prefixes = NULL;
208 static char *arg_root = NULL;
209 static char *arg_image = NULL;
210 static char *arg_replace = NULL;
211 static ImagePolicy *arg_image_policy = NULL;
212
213 #define MAX_DEPTH 256
214
215 typedef struct Context {
216 OrderedHashmap *items, *globs;
217 Set *unix_sockets;
218 } Context;
219
220 STATIC_DESTRUCTOR_REGISTER(arg_include_prefixes, freep);
221 STATIC_DESTRUCTOR_REGISTER(arg_exclude_prefixes, freep);
222 STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
223 STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
224 STATIC_DESTRUCTOR_REGISTER(arg_image_policy, image_policy_freep);
225
226 static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = {
227 [CREATION_NORMAL] = "Created",
228 [CREATION_EXISTING] = "Found existing",
229 [CREATION_FORCE] = "Created replacement",
230 };
231
232 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
233
234 static void context_done(Context *c) {
235 assert(c);
236
237 ordered_hashmap_free(c->items);
238 ordered_hashmap_free(c->globs);
239
240 set_free(c->unix_sockets);
241 }
242
243 /* Different kinds of errors that mean that information is not available in the environment. */
244 static bool ERRNO_IS_NOINFO(int r) {
245 return IN_SET(abs(r),
246 EUNATCH, /* os-release or machine-id missing */
247 ENOMEDIUM, /* machine-id or another file empty */
248 ENOPKG, /* machine-id is uninitialized */
249 ENXIO); /* env var is unset */
250 }
251
252 static int specifier_directory(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
253 struct table_entry {
254 uint64_t type;
255 const char *suffix;
256 };
257
258 static const struct table_entry paths_system[] = {
259 [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
260 [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
261 [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
262 [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
263 };
264
265 static const struct table_entry paths_user[] = {
266 [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
267 [DIRECTORY_STATE] = { SD_PATH_USER_STATE_PRIVATE },
268 [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
269 [DIRECTORY_LOGS] = { SD_PATH_USER_STATE_PRIVATE, "log" },
270 };
271
272 const struct table_entry *paths;
273 _cleanup_free_ char *p = NULL;
274 unsigned i;
275 int r;
276
277 assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
278 paths = arg_runtime_scope == RUNTIME_SCOPE_USER ? paths_user : paths_system;
279
280 i = PTR_TO_UINT(data);
281 assert(i < ELEMENTSOF(paths_system));
282
283 r = sd_path_lookup(paths[i].type, paths[i].suffix, &p);
284 if (r < 0)
285 return r;
286
287 if (arg_root) {
288 _cleanup_free_ char *j = NULL;
289
290 j = path_join(arg_root, p);
291 if (!j)
292 return -ENOMEM;
293
294 *ret = TAKE_PTR(j);
295 } else
296 *ret = TAKE_PTR(p);
297
298 return 0;
299 }
300
301 static int log_unresolvable_specifier(const char *filename, unsigned line) {
302 static bool notified = false;
303
304 /* In system mode, this is called when /etc is not fully initialized and some specifiers are
305 * unresolvable. In user mode, this is called when some variables are not defined. These cases are
306 * not considered a fatal error, so log at LOG_NOTICE only for the first time and then downgrade this
307 * to LOG_DEBUG for the rest.
308 *
309 * If we're running in a chroot (--root was used or sd_booted() reports that systemd is not running),
310 * always use LOG_DEBUG. We may be called to initialize a chroot before booting and there is no
311 * expectation that machine-id and other files will be populated.
312 */
313
314 int log_level = notified || arg_root || running_in_chroot() > 0 ?
315 LOG_DEBUG : LOG_NOTICE;
316
317 log_syntax(NULL,
318 log_level,
319 filename, line, 0,
320 "Failed to resolve specifier: %s, skipping.",
321 arg_runtime_scope == RUNTIME_SCOPE_USER ? "Required $XDG_... variable not defined" : "uninitialized /etc/ detected");
322
323 if (!notified)
324 log_full(log_level,
325 "All rules containing unresolvable specifiers will be skipped.");
326
327 notified = true;
328 return 0;
329 }
330
331 static int user_config_paths(char*** ret) {
332 _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
333 _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
334 _cleanup_strv_free_ char **res = NULL;
335 int r;
336
337 r = xdg_user_dirs(&config_dirs, &data_dirs);
338 if (r < 0)
339 return r;
340
341 r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
342 if (r < 0 && !ERRNO_IS_NOINFO(r))
343 return r;
344
345 r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
346 if (r < 0 && !ERRNO_IS_NOINFO(r))
347 return r;
348
349 r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
350 if (r < 0 && !ERRNO_IS_NOINFO(r))
351 return r;
352
353 r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
354 if (r < 0)
355 return r;
356
357 r = strv_extend(&res, persistent_config);
358 if (r < 0)
359 return r;
360
361 r = strv_extend(&res, runtime_config);
362 if (r < 0)
363 return r;
364
365 r = strv_extend(&res, data_home);
366 if (r < 0)
367 return r;
368
369 r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
370 if (r < 0)
371 return r;
372
373 r = path_strv_make_absolute_cwd(res);
374 if (r < 0)
375 return r;
376
377 *ret = TAKE_PTR(res);
378 return 0;
379 }
380
381 static bool needs_glob(ItemType t) {
382 return IN_SET(t,
383 WRITE_FILE,
384 IGNORE_PATH,
385 IGNORE_DIRECTORY_PATH,
386 REMOVE_PATH,
387 RECURSIVE_REMOVE_PATH,
388 EMPTY_DIRECTORY,
389 ADJUST_MODE,
390 RELABEL_PATH,
391 RECURSIVE_RELABEL_PATH,
392 SET_XATTR,
393 RECURSIVE_SET_XATTR,
394 SET_ACL,
395 RECURSIVE_SET_ACL,
396 SET_ATTRIBUTE,
397 RECURSIVE_SET_ATTRIBUTE);
398 }
399
400 static bool takes_ownership(ItemType t) {
401 return IN_SET(t,
402 CREATE_FILE,
403 TRUNCATE_FILE,
404 CREATE_DIRECTORY,
405 EMPTY_DIRECTORY,
406 TRUNCATE_DIRECTORY,
407 CREATE_SUBVOLUME,
408 CREATE_SUBVOLUME_INHERIT_QUOTA,
409 CREATE_SUBVOLUME_NEW_QUOTA,
410 CREATE_FIFO,
411 CREATE_SYMLINK,
412 CREATE_CHAR_DEVICE,
413 CREATE_BLOCK_DEVICE,
414 COPY_FILES,
415 WRITE_FILE,
416 IGNORE_PATH,
417 IGNORE_DIRECTORY_PATH,
418 REMOVE_PATH,
419 RECURSIVE_REMOVE_PATH);
420 }
421
422 static struct Item* find_glob(OrderedHashmap *h, const char *match) {
423 ItemArray *j;
424
425 ORDERED_HASHMAP_FOREACH(j, h) {
426 size_t n;
427
428 for (n = 0; n < j->n_items; n++) {
429 Item *item = j->items + n;
430
431 if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
432 return item;
433 }
434 }
435
436 return NULL;
437 }
438
439 static int load_unix_sockets(Context *c) {
440 _cleanup_set_free_ Set *sockets = NULL;
441 _cleanup_fclose_ FILE *f = NULL;
442 int r;
443
444 if (c->unix_sockets)
445 return 0;
446
447 /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
448
449 f = fopen("/proc/net/unix", "re");
450 if (!f)
451 return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
452 "Failed to open /proc/net/unix, ignoring: %m");
453
454 /* Skip header */
455 r = read_line(f, LONG_LINE_MAX, NULL);
456 if (r < 0)
457 return log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
458 if (r == 0)
459 return log_warning_errno(SYNTHETIC_ERRNO(EIO), "Premature end of file reading /proc/net/unix.");
460
461 for (;;) {
462 _cleanup_free_ char *line = NULL;
463 char *p;
464
465 r = read_line(f, LONG_LINE_MAX, &line);
466 if (r < 0)
467 return log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
468 if (r == 0) /* EOF */
469 break;
470
471 p = strchr(line, ':');
472 if (!p)
473 continue;
474
475 if (strlen(p) < 37)
476 continue;
477
478 p += 37;
479 p += strspn(p, WHITESPACE);
480 p += strcspn(p, WHITESPACE); /* skip one more word */
481 p += strspn(p, WHITESPACE);
482
483 if (!path_is_absolute(p))
484 continue;
485
486 r = set_put_strdup_full(&sockets, &path_hash_ops_free, p);
487 if (r < 0)
488 return log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
489 }
490
491 c->unix_sockets = TAKE_PTR(sockets);
492 return 1;
493 }
494
495 static bool unix_socket_alive(Context *c, const char *fn) {
496 assert(c);
497 assert(fn);
498
499 if (load_unix_sockets(c) < 0)
500 return true; /* We don't know, so assume yes */
501
502 return set_contains(c->unix_sockets, fn);
503 }
504
505 /* Accessors for the argument in binary format */
506 static const void* item_binary_argument(const Item *i) {
507 assert(i);
508 return i->binary_argument ?: i->argument;
509 }
510
511 static size_t item_binary_argument_size(const Item *i) {
512 assert(i);
513 return i->binary_argument ? i->binary_argument_size : strlen_ptr(i->argument);
514 }
515
516 static DIR* xopendirat_nomod(int dirfd, const char *path) {
517 DIR *dir;
518
519 dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
520 if (dir)
521 return dir;
522
523 if (!IN_SET(errno, ENOENT, ELOOP))
524 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
525
526 if (errno != EPERM)
527 return NULL;
528
529 dir = xopendirat(dirfd, path, O_NOFOLLOW);
530 if (!dir)
531 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
532
533 return dir;
534 }
535
536 static DIR* opendir_nomod(const char *path) {
537 return xopendirat_nomod(AT_FDCWD, path);
538 }
539
540 static nsec_t load_statx_timestamp_nsec(const struct statx_timestamp *ts) {
541 assert(ts);
542
543 if (ts->tv_sec < 0)
544 return NSEC_INFINITY;
545
546 if ((nsec_t) ts->tv_sec >= (UINT64_MAX - ts->tv_nsec) / NSEC_PER_SEC)
547 return NSEC_INFINITY;
548
549 return ts->tv_sec * NSEC_PER_SEC + ts->tv_nsec;
550 }
551
552 static bool needs_cleanup(
553 nsec_t atime,
554 nsec_t btime,
555 nsec_t ctime,
556 nsec_t mtime,
557 nsec_t cutoff,
558 const char *sub_path,
559 AgeBy age_by,
560 bool is_dir) {
561
562 if (FLAGS_SET(age_by, AGE_BY_MTIME) && mtime != NSEC_INFINITY && mtime >= cutoff) {
563 /* Follows spelling in stat(1). */
564 log_debug("%s \"%s\": modify time %s is too new.",
565 is_dir ? "Directory" : "File",
566 sub_path,
567 FORMAT_TIMESTAMP_STYLE(mtime / NSEC_PER_USEC, TIMESTAMP_US));
568
569 return false;
570 }
571
572 if (FLAGS_SET(age_by, AGE_BY_ATIME) && atime != NSEC_INFINITY && atime >= cutoff) {
573 log_debug("%s \"%s\": access time %s is too new.",
574 is_dir ? "Directory" : "File",
575 sub_path,
576 FORMAT_TIMESTAMP_STYLE(atime / NSEC_PER_USEC, TIMESTAMP_US));
577
578 return false;
579 }
580
581 /*
582 * Note: Unless explicitly specified by the user, "ctime" is ignored
583 * by default for directories, because we change it when deleting.
584 */
585 if (FLAGS_SET(age_by, AGE_BY_CTIME) && ctime != NSEC_INFINITY && ctime >= cutoff) {
586 log_debug("%s \"%s\": change time %s is too new.",
587 is_dir ? "Directory" : "File",
588 sub_path,
589 FORMAT_TIMESTAMP_STYLE(ctime / NSEC_PER_USEC, TIMESTAMP_US));
590
591 return false;
592 }
593
594 if (FLAGS_SET(age_by, AGE_BY_BTIME) && btime != NSEC_INFINITY && btime >= cutoff) {
595 log_debug("%s \"%s\": birth time %s is too new.",
596 is_dir ? "Directory" : "File",
597 sub_path,
598 FORMAT_TIMESTAMP_STYLE(btime / NSEC_PER_USEC, TIMESTAMP_US));
599
600 return false;
601 }
602
603 return true;
604 }
605
606 static int dir_cleanup(
607 Context *c,
608 Item *i,
609 const char *p,
610 DIR *d,
611 nsec_t self_atime_nsec,
612 nsec_t self_mtime_nsec,
613 nsec_t cutoff_nsec,
614 dev_t rootdev_major,
615 dev_t rootdev_minor,
616 bool mountpoint,
617 int maxdepth,
618 bool keep_this_level,
619 AgeBy age_by_file,
620 AgeBy age_by_dir) {
621
622 bool deleted = false;
623 int r = 0;
624
625 assert(c);
626 assert(i);
627 assert(d);
628
629 FOREACH_DIRENT_ALL(de, d, break) {
630 _cleanup_free_ char *sub_path = NULL;
631 nsec_t atime_nsec, mtime_nsec, ctime_nsec, btime_nsec;
632
633 if (dot_or_dot_dot(de->d_name))
634 continue;
635
636 /* If statx() is supported, use it. It's preferable over fstatat() since it tells us
637 * explicitly where we are looking at a mount point, for free as side information. Determining
638 * the same information without statx() is hard, see the complexity of path_is_mount_point(),
639 * and also much slower as it requires a number of syscalls instead of just one. Hence, when
640 * we have modern statx() we use it instead of fstat() and do proper mount point checks,
641 * while on older kernels's well do traditional st_dev based detection of mount points.
642 *
643 * Using statx() for detecting mount points also has the benfit that we handle weird file
644 * systems such as overlayfs better where each file is originating from a different
645 * st_dev. */
646
647 STRUCT_STATX_DEFINE(sx);
648
649 r = statx_fallback(
650 dirfd(d), de->d_name,
651 AT_SYMLINK_NOFOLLOW|AT_NO_AUTOMOUNT,
652 STATX_TYPE|STATX_MODE|STATX_UID|STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_BTIME,
653 &sx);
654 if (r == -ENOENT)
655 continue;
656 if (r < 0) {
657 /* FUSE, NFS mounts, SELinux might return EACCES */
658 r = log_full_errno(r == -EACCES ? LOG_DEBUG : LOG_ERR, r,
659 "statx(%s/%s) failed: %m", p, de->d_name);
660 continue;
661 }
662
663 if (FLAGS_SET(sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT)) {
664 /* Yay, we have the mount point API, use it */
665 if (FLAGS_SET(sx.stx_attributes, STATX_ATTR_MOUNT_ROOT)) {
666 log_debug("Ignoring \"%s/%s\": different mount points.", p, de->d_name);
667 continue;
668 }
669 } else {
670 /* So we might have statx() but the STATX_ATTR_MOUNT_ROOT flag is not supported, fall
671 * back to traditional stx_dev checking. */
672 if (sx.stx_dev_major != rootdev_major ||
673 sx.stx_dev_minor != rootdev_minor) {
674 log_debug("Ignoring \"%s/%s\": different filesystem.", p, de->d_name);
675 continue;
676 }
677
678 /* Try to detect bind mounts of the same filesystem instance; they do not differ in device
679 * major/minors. This type of query is not supported on all kernels or filesystem types
680 * though. */
681 if (S_ISDIR(sx.stx_mode)) {
682 int q;
683
684 q = fd_is_mount_point(dirfd(d), de->d_name, 0);
685 if (q < 0)
686 log_debug_errno(q, "Failed to determine whether \"%s/%s\" is a mount point, ignoring: %m", p, de->d_name);
687 else if (q > 0) {
688 log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.", p, de->d_name);
689 continue;
690 }
691 }
692 }
693
694 atime_nsec = FLAGS_SET(sx.stx_mask, STATX_ATIME) ? load_statx_timestamp_nsec(&sx.stx_atime) : 0;
695 mtime_nsec = FLAGS_SET(sx.stx_mask, STATX_MTIME) ? load_statx_timestamp_nsec(&sx.stx_mtime) : 0;
696 ctime_nsec = FLAGS_SET(sx.stx_mask, STATX_CTIME) ? load_statx_timestamp_nsec(&sx.stx_ctime) : 0;
697 btime_nsec = FLAGS_SET(sx.stx_mask, STATX_BTIME) ? load_statx_timestamp_nsec(&sx.stx_btime) : 0;
698
699 sub_path = path_join(p, de->d_name);
700 if (!sub_path) {
701 r = log_oom();
702 goto finish;
703 }
704
705 /* Is there an item configured for this path? */
706 if (ordered_hashmap_get(c->items, sub_path)) {
707 log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
708 continue;
709 }
710
711 if (find_glob(c->globs, sub_path)) {
712 log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
713 continue;
714 }
715
716 if (S_ISDIR(sx.stx_mode)) {
717 _cleanup_closedir_ DIR *sub_dir = NULL;
718
719 if (mountpoint &&
720 streq(de->d_name, "lost+found") &&
721 sx.stx_uid == 0) {
722 log_debug("Ignoring directory \"%s\".", sub_path);
723 continue;
724 }
725
726 if (maxdepth <= 0)
727 log_warning("Reached max depth on \"%s\".", sub_path);
728 else {
729 int q;
730
731 sub_dir = xopendirat_nomod(dirfd(d), de->d_name);
732 if (!sub_dir) {
733 if (errno != ENOENT)
734 r = log_warning_errno(errno, "Opening directory \"%s\" failed, ignoring: %m", sub_path);
735
736 continue;
737 }
738
739 if (flock(dirfd(sub_dir), LOCK_EX|LOCK_NB) < 0) {
740 log_debug_errno(errno, "Couldn't acquire shared BSD lock on directory \"%s\", skipping: %m", sub_path);
741 continue;
742 }
743
744 q = dir_cleanup(c, i,
745 sub_path, sub_dir,
746 atime_nsec, mtime_nsec, cutoff_nsec,
747 rootdev_major, rootdev_minor,
748 false, maxdepth-1, false,
749 age_by_file, age_by_dir);
750 if (q < 0)
751 r = q;
752 }
753
754 /* Note: if you are wondering why we don't support the sticky bit for excluding
755 * directories from cleaning like we do it for other file system objects: well, the
756 * sticky bit already has a meaning for directories, so we don't want to overload
757 * that. */
758
759 if (keep_this_level) {
760 log_debug("Keeping directory \"%s\".", sub_path);
761 continue;
762 }
763
764 /*
765 * Check the file timestamps of an entry against the
766 * given cutoff time; delete if it is older.
767 */
768 if (!needs_cleanup(atime_nsec, btime_nsec, ctime_nsec, mtime_nsec,
769 cutoff_nsec, sub_path, age_by_dir, true))
770 continue;
771
772 log_debug("Removing directory \"%s\".", sub_path);
773 if (unlinkat(dirfd(d), de->d_name, AT_REMOVEDIR) < 0)
774 if (!IN_SET(errno, ENOENT, ENOTEMPTY))
775 r = log_warning_errno(errno, "Failed to remove directory \"%s\", ignoring: %m", sub_path);
776
777 } else {
778 _cleanup_close_ int fd = -EBADF;
779
780 /* Skip files for which the sticky bit is set. These are semantics we define, and are
781 * unknown elsewhere. See XDG_RUNTIME_DIR specification for details. */
782 if (sx.stx_mode & S_ISVTX) {
783 log_debug("Skipping \"%s\": sticky bit set.", sub_path);
784 continue;
785 }
786
787 if (mountpoint &&
788 S_ISREG(sx.stx_mode) &&
789 sx.stx_uid == 0 &&
790 STR_IN_SET(de->d_name,
791 ".journal",
792 "aquota.user",
793 "aquota.group")) {
794 log_debug("Skipping \"%s\".", sub_path);
795 continue;
796 }
797
798 /* Ignore sockets that are listed in /proc/net/unix */
799 if (S_ISSOCK(sx.stx_mode) && unix_socket_alive(c, sub_path)) {
800 log_debug("Skipping \"%s\": live socket.", sub_path);
801 continue;
802 }
803
804 /* Ignore device nodes */
805 if (S_ISCHR(sx.stx_mode) || S_ISBLK(sx.stx_mode)) {
806 log_debug("Skipping \"%s\": a device.", sub_path);
807 continue;
808 }
809
810 /* Keep files on this level around if this is requested */
811 if (keep_this_level) {
812 log_debug("Keeping \"%s\".", sub_path);
813 continue;
814 }
815
816 if (!needs_cleanup(atime_nsec, btime_nsec, ctime_nsec, mtime_nsec,
817 cutoff_nsec, sub_path, age_by_file, false))
818 continue;
819
820 fd = xopenat(dirfd(d),
821 de->d_name,
822 O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME,
823 /* xopen_flags = */ 0,
824 /* mode = */ 0);
825 if (fd < 0 && !IN_SET(fd, -ENOENT, -ELOOP))
826 log_warning_errno(fd, "Opening file \"%s\" failed, ignoring: %m", sub_path);
827 if (fd >= 0 && flock(fd, LOCK_EX|LOCK_NB) < 0 && errno == EAGAIN) {
828 log_debug_errno(errno, "Couldn't acquire shared BSD lock on file \"%s\", skipping: %m", sub_path);
829 continue;
830 }
831
832 log_debug("Removing \"%s\".", sub_path);
833 if (unlinkat(dirfd(d), de->d_name, 0) < 0)
834 if (errno != ENOENT)
835 r = log_warning_errno(errno, "Failed to remove \"%s\", ignoring: %m", sub_path);
836
837 deleted = true;
838 }
839 }
840
841 finish:
842 if (deleted) {
843 struct timespec ts[2];
844
845 log_debug("Restoring access and modification time on \"%s\": %s, %s",
846 p,
847 FORMAT_TIMESTAMP_STYLE(self_atime_nsec / NSEC_PER_USEC, TIMESTAMP_US),
848 FORMAT_TIMESTAMP_STYLE(self_mtime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
849
850 timespec_store_nsec(ts + 0, self_atime_nsec);
851 timespec_store_nsec(ts + 1, self_mtime_nsec);
852
853 /* Restore original directory timestamps */
854 if (futimens(dirfd(d), ts) < 0)
855 log_warning_errno(errno, "Failed to revert timestamps of '%s', ignoring: %m", p);
856 }
857
858 return r;
859 }
860
861 static bool dangerous_hardlinks(void) {
862 _cleanup_free_ char *value = NULL;
863 static int cached = -1;
864 int r;
865
866 /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
867 * what the upstream default is. */
868
869 if (cached >= 0)
870 return cached;
871
872 r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
873 if (r < 0) {
874 log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
875 return true;
876 }
877
878 r = parse_boolean(value);
879 if (r < 0) {
880 log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
881 return true;
882 }
883
884 cached = r == 0;
885 return cached;
886 }
887
888 static bool hardlink_vulnerable(const struct stat *st) {
889 assert(st);
890
891 return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
892 }
893
894 static mode_t process_mask_perms(mode_t mode, mode_t current) {
895
896 if ((current & 0111) == 0)
897 mode &= ~0111;
898 if ((current & 0222) == 0)
899 mode &= ~0222;
900 if ((current & 0444) == 0)
901 mode &= ~0444;
902 if (!S_ISDIR(current))
903 mode &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
904
905 return mode;
906 }
907
908 static int fd_set_perms(
909 Context *c,
910 Item *i,
911 int fd,
912 const char *path,
913 const struct stat *st,
914 CreationMode creation) {
915
916 bool do_chown, do_chmod;
917 struct stat stbuf;
918 mode_t new_mode;
919 uid_t new_uid;
920 gid_t new_gid;
921 int r;
922
923 assert(c);
924 assert(i);
925 assert(fd >= 0);
926 assert(path);
927
928 if (!i->mode_set && !i->uid_set && !i->gid_set)
929 goto shortcut;
930
931 if (!st) {
932 if (fstat(fd, &stbuf) < 0)
933 return log_error_errno(errno, "fstat(%s) failed: %m", path);
934 st = &stbuf;
935 }
936
937 if (hardlink_vulnerable(st))
938 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
939 "Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
940 path);
941 new_uid = i->uid_set && (creation != CREATION_EXISTING || !i->uid_only_create) ? i->uid : st->st_uid;
942 new_gid = i->gid_set && (creation != CREATION_EXISTING || !i->gid_only_create) ? i->gid : st->st_gid;
943
944 /* Do we need a chown()? */
945 do_chown = (new_uid != st->st_uid) || (new_gid != st->st_gid);
946
947 /* Calculate the mode to apply */
948 new_mode = i->mode_set && (creation != CREATION_EXISTING || !i->mode_only_create) ?
949 (i->mask_perms ? process_mask_perms(i->mode, st->st_mode) : i->mode) :
950 (st->st_mode & 07777);
951
952 do_chmod = ((new_mode ^ st->st_mode) & 07777) != 0;
953
954 if (do_chmod && do_chown) {
955 /* Before we issue the chmod() let's reduce the access mode to the common bits of the old and
956 * the new mode. That way there's no time window where the file exists under the old owner
957 * with more than the old access modes — and not under the new owner with more than the new
958 * access modes either. */
959
960 if (S_ISLNK(st->st_mode))
961 log_debug("Skipping temporary mode fix for symlink %s.", path);
962 else {
963 mode_t m = new_mode & st->st_mode; /* Mask new mode by old mode */
964
965 if (((m ^ st->st_mode) & 07777) == 0)
966 log_debug("\"%s\" matches temporary mode %o already.", path, m);
967 else {
968 log_debug("Temporarily changing \"%s\" to mode %o.", path, m);
969 r = fchmod_opath(fd, m);
970 if (r < 0)
971 return log_error_errno(r, "fchmod() of %s failed: %m", path);
972 }
973 }
974 }
975
976 if (do_chown) {
977 log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT, path, new_uid, new_gid);
978
979 if (fchownat(fd, "",
980 new_uid != st->st_uid ? new_uid : UID_INVALID,
981 new_gid != st->st_gid ? new_gid : GID_INVALID,
982 AT_EMPTY_PATH) < 0)
983 return log_error_errno(errno, "fchownat() of %s failed: %m", path);
984 }
985
986 /* Now, apply the final mode. We do this in two cases: when the user set a mode explicitly, or after a
987 * chown(), since chown()'s mangle the access mode in regards to sgid/suid in some conditions. */
988 if (do_chmod || do_chown) {
989 if (S_ISLNK(st->st_mode))
990 log_debug("Skipping mode fix for symlink %s.", path);
991 else {
992 log_debug("Changing \"%s\" to mode %o.", path, new_mode);
993 r = fchmod_opath(fd, new_mode);
994 if (r < 0)
995 return log_error_errno(r, "fchmod() of %s failed: %m", path);
996 }
997 }
998
999 shortcut:
1000 return label_fix_full(fd, /* inode_path= */ NULL, /* label_path= */ path, 0);
1001 }
1002
1003 static int path_open_parent_safe(const char *path, bool allow_failure) {
1004 _cleanup_free_ char *dn = NULL;
1005 int r, fd;
1006
1007 if (!path_is_normalized(path))
1008 return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR,
1009 SYNTHETIC_ERRNO(EINVAL),
1010 "Failed to open parent of '%s': path not normalized%s.",
1011 path,
1012 allow_failure ? ", ignoring" : "");
1013
1014 r = path_extract_directory(path, &dn);
1015 if (r < 0)
1016 return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR,
1017 r,
1018 "Unable to determine parent directory of '%s'%s: %m",
1019 path,
1020 allow_failure ? ", ignoring" : "");
1021
1022 r = chase(dn, arg_root, allow_failure ? CHASE_SAFE : CHASE_SAFE|CHASE_WARN, NULL, &fd);
1023 if (r == -ENOLINK) /* Unsafe symlink: already covered by CHASE_WARN */
1024 return r;
1025 if (r < 0)
1026 return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR,
1027 r,
1028 "Failed to open path '%s'%s: %m",
1029 dn,
1030 allow_failure ? ", ignoring" : "");
1031
1032 return fd;
1033 }
1034
1035 static int path_open_safe(const char *path) {
1036 int r, fd;
1037
1038 /* path_open_safe() returns a file descriptor opened with O_PATH after
1039 * verifying that the path doesn't contain unsafe transitions, except
1040 * for its final component as the function does not follow symlink. */
1041
1042 assert(path);
1043
1044 if (!path_is_normalized(path))
1045 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to open invalid path '%s'.", path);
1046
1047 r = chase(path, arg_root, CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL, &fd);
1048 if (r == -ENOLINK)
1049 return r; /* Unsafe symlink: already covered by CHASE_WARN */
1050 if (r < 0)
1051 return log_error_errno(r, "Failed to open path %s: %m", path);
1052
1053 return fd;
1054 }
1055
1056 static int path_set_perms(
1057 Context *c,
1058 Item *i,
1059 const char *path,
1060 CreationMode creation) {
1061
1062 _cleanup_close_ int fd = -EBADF;
1063
1064 assert(c);
1065 assert(i);
1066 assert(path);
1067
1068 fd = path_open_safe(path);
1069 if (fd < 0)
1070 return fd;
1071
1072 return fd_set_perms(c, i, fd, path, /* st= */ NULL, creation);
1073 }
1074
1075 static int parse_xattrs_from_arg(Item *i) {
1076 const char *p;
1077 int r;
1078
1079 assert(i);
1080
1081 assert_se(p = i->argument);
1082 for (;;) {
1083 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
1084
1085 r = extract_first_word(&p, &xattr, NULL, EXTRACT_UNQUOTE|EXTRACT_CUNESCAPE);
1086 if (r < 0)
1087 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
1088 if (r <= 0)
1089 break;
1090
1091 r = split_pair(xattr, "=", &name, &value);
1092 if (r < 0) {
1093 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
1094 continue;
1095 }
1096
1097 if (isempty(name) || isempty(value)) {
1098 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
1099 continue;
1100 }
1101
1102 if (strv_push_pair(&i->xattrs, name, value) < 0)
1103 return log_oom();
1104
1105 name = value = NULL;
1106 }
1107
1108 return 0;
1109 }
1110
1111 static int fd_set_xattrs(
1112 Context *c,
1113 Item *i,
1114 int fd,
1115 const char *path,
1116 const struct stat *st,
1117 CreationMode creation) {
1118
1119 assert(c);
1120 assert(i);
1121 assert(fd >= 0);
1122 assert(path);
1123
1124 STRV_FOREACH_PAIR(name, value, i->xattrs) {
1125 log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
1126 if (setxattr(FORMAT_PROC_FD_PATH(fd), *name, *value, strlen(*value), 0) < 0)
1127 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
1128 *name, *value, path);
1129 }
1130 return 0;
1131 }
1132
1133 static int path_set_xattrs(
1134 Context *c,
1135 Item *i,
1136 const char *path,
1137 CreationMode creation) {
1138
1139 _cleanup_close_ int fd = -EBADF;
1140
1141 assert(c);
1142 assert(i);
1143 assert(path);
1144
1145 fd = path_open_safe(path);
1146 if (fd < 0)
1147 return fd;
1148
1149 return fd_set_xattrs(c, i, fd, path, /* st = */ NULL, creation);
1150 }
1151
1152 static int parse_acls_from_arg(Item *item) {
1153 #if HAVE_ACL
1154 int r;
1155
1156 assert(item);
1157
1158 /* If append_or_force (= modify) is set, we will not modify the acl
1159 * afterwards, so the mask can be added now if necessary. */
1160
1161 r = parse_acl(item->argument, &item->acl_access, &item->acl_access_exec,
1162 &item->acl_default, !item->append_or_force);
1163 if (r < 0)
1164 log_full_errno(arg_graceful && IN_SET(r, -ENOENT, -ESRCH) ? LOG_DEBUG : LOG_WARNING,
1165 r, "Failed to parse ACL \"%s\", ignoring: %m", item->argument);
1166 #else
1167 log_warning("ACLs are not supported, ignoring.");
1168 #endif
1169
1170 return 0;
1171 }
1172
1173 #if HAVE_ACL
1174 static int parse_acl_cond_exec(
1175 const char *path,
1176 acl_t access, /* could be empty (NULL) */
1177 acl_t cond_exec,
1178 const struct stat *st,
1179 bool append,
1180 acl_t *ret) {
1181
1182 _cleanup_(acl_freep) acl_t parsed = NULL;
1183 acl_entry_t entry;
1184 acl_permset_t permset;
1185 bool has_exec;
1186 int r;
1187
1188 assert(path);
1189 assert(ret);
1190 assert(st);
1191
1192 parsed = access ? acl_dup(access) : acl_init(0);
1193 if (!parsed)
1194 return -errno;
1195
1196 /* Since we substitute 'X' with 'x' in parse_acl(), we just need to copy the entries over
1197 * for directories */
1198 if (S_ISDIR(st->st_mode)) {
1199 for (r = acl_get_entry(cond_exec, ACL_FIRST_ENTRY, &entry);
1200 r > 0;
1201 r = acl_get_entry(cond_exec, ACL_NEXT_ENTRY, &entry)) {
1202
1203 acl_entry_t parsed_entry;
1204
1205 if (acl_create_entry(&parsed, &parsed_entry) < 0)
1206 return -errno;
1207
1208 if (acl_copy_entry(parsed_entry, entry) < 0)
1209 return -errno;
1210 }
1211 if (r < 0)
1212 return -errno;
1213
1214 goto finish;
1215 }
1216
1217 has_exec = st->st_mode & S_IXUSR;
1218
1219 if (!has_exec && append) {
1220 _cleanup_(acl_freep) acl_t old = NULL;
1221
1222 old = acl_get_file(path, ACL_TYPE_ACCESS);
1223 if (!old)
1224 return -errno;
1225
1226 for (r = acl_get_entry(old, ACL_FIRST_ENTRY, &entry);
1227 r > 0;
1228 r = acl_get_entry(old, ACL_NEXT_ENTRY, &entry)) {
1229
1230 if (acl_get_permset(entry, &permset) < 0)
1231 return -errno;
1232
1233 r = acl_get_perm(permset, ACL_EXECUTE);
1234 if (r < 0)
1235 return -errno;
1236 if (r > 0) {
1237 has_exec = true;
1238 break;
1239 }
1240 }
1241 if (r < 0)
1242 return -errno;
1243 }
1244
1245 /* Check if we're about to set the execute bit in acl_access */
1246 if (!has_exec && access) {
1247 for (r = acl_get_entry(access, ACL_FIRST_ENTRY, &entry);
1248 r > 0;
1249 r = acl_get_entry(access, ACL_NEXT_ENTRY, &entry)) {
1250
1251 if (acl_get_permset(entry, &permset) < 0)
1252 return -errno;
1253
1254 r = acl_get_perm(permset, ACL_EXECUTE);
1255 if (r < 0)
1256 return -errno;
1257 if (r > 0) {
1258 has_exec = true;
1259 break;
1260 }
1261 }
1262 if (r < 0)
1263 return -errno;
1264 }
1265
1266 for (r = acl_get_entry(cond_exec, ACL_FIRST_ENTRY, &entry);
1267 r > 0;
1268 r = acl_get_entry(cond_exec, ACL_NEXT_ENTRY, &entry)) {
1269
1270 acl_entry_t parsed_entry;
1271
1272 if (acl_create_entry(&parsed, &parsed_entry) < 0)
1273 return -errno;
1274
1275 if (acl_copy_entry(parsed_entry, entry) < 0)
1276 return -errno;
1277
1278 if (!has_exec) {
1279 if (acl_get_permset(parsed_entry, &permset) < 0)
1280 return -errno;
1281
1282 if (acl_delete_perm(permset, ACL_EXECUTE) < 0)
1283 return -errno;
1284 }
1285 }
1286 if (r < 0)
1287 return -errno;
1288
1289 finish:
1290 if (!append) { /* want_mask = true */
1291 r = calc_acl_mask_if_needed(&parsed);
1292 if (r < 0)
1293 return r;
1294 }
1295
1296 *ret = TAKE_PTR(parsed);
1297
1298 return 0;
1299 }
1300
1301 static int path_set_acl(
1302 Context *c,
1303 const char *path,
1304 const char *pretty,
1305 acl_type_t type,
1306 acl_t acl,
1307 bool modify) {
1308
1309 _cleanup_(acl_free_charpp) char *t = NULL;
1310 _cleanup_(acl_freep) acl_t dup = NULL;
1311 int r;
1312
1313 assert(c);
1314
1315 /* Returns 0 for success, positive error if already warned, negative error otherwise. */
1316
1317 if (modify) {
1318 r = acls_for_file(path, type, acl, &dup);
1319 if (r < 0)
1320 return r;
1321
1322 r = calc_acl_mask_if_needed(&dup);
1323 if (r < 0)
1324 return r;
1325 } else {
1326 dup = acl_dup(acl);
1327 if (!dup)
1328 return -errno;
1329
1330 /* the mask was already added earlier if needed */
1331 }
1332
1333 r = add_base_acls_if_needed(&dup, path);
1334 if (r < 0)
1335 return r;
1336
1337 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
1338 log_debug("Setting %s ACL %s on %s.",
1339 type == ACL_TYPE_ACCESS ? "access" : "default",
1340 strna(t), pretty);
1341
1342 r = acl_set_file(path, type, dup);
1343 if (r < 0) {
1344 if (ERRNO_IS_NOT_SUPPORTED(errno))
1345 /* No error if filesystem doesn't support ACLs. Return negative. */
1346 return -errno;
1347 else
1348 /* Return positive to indicate we already warned */
1349 return -log_error_errno(errno,
1350 "Setting %s ACL \"%s\" on %s failed: %m",
1351 type == ACL_TYPE_ACCESS ? "access" : "default",
1352 strna(t), pretty);
1353 }
1354 return 0;
1355 }
1356 #endif
1357
1358 static int fd_set_acls(
1359 Context *c,
1360 Item *item,
1361 int fd,
1362 const char *path,
1363 const struct stat *st,
1364 CreationMode creation) {
1365
1366 int r = 0;
1367 #if HAVE_ACL
1368 _cleanup_(acl_freep) acl_t access_with_exec_parsed = NULL;
1369 struct stat stbuf;
1370
1371 assert(c);
1372 assert(item);
1373 assert(fd >= 0);
1374 assert(path);
1375
1376 if (!st) {
1377 if (fstat(fd, &stbuf) < 0)
1378 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1379 st = &stbuf;
1380 }
1381
1382 if (hardlink_vulnerable(st))
1383 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
1384 "Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
1385 path);
1386
1387 if (S_ISLNK(st->st_mode)) {
1388 log_debug("Skipping ACL fix for symlink %s.", path);
1389 return 0;
1390 }
1391
1392 if (item->acl_access_exec) {
1393 r = parse_acl_cond_exec(FORMAT_PROC_FD_PATH(fd),
1394 item->acl_access,
1395 item->acl_access_exec,
1396 st,
1397 item->append_or_force,
1398 &access_with_exec_parsed);
1399 if (r < 0)
1400 return log_error_errno(r, "Failed to parse conditionalized execute bit for \"%s\": %m", path);
1401
1402 r = path_set_acl(c, FORMAT_PROC_FD_PATH(fd), path, ACL_TYPE_ACCESS, access_with_exec_parsed, item->append_or_force);
1403 } else if (item->acl_access)
1404 r = path_set_acl(c, FORMAT_PROC_FD_PATH(fd), path, ACL_TYPE_ACCESS, item->acl_access, item->append_or_force);
1405
1406 /* set only default acls to folders */
1407 if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
1408 r = path_set_acl(c, FORMAT_PROC_FD_PATH(fd), path, ACL_TYPE_DEFAULT, item->acl_default, item->append_or_force);
1409
1410 if (ERRNO_IS_NOT_SUPPORTED(r)) {
1411 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1412 return 0;
1413 }
1414
1415 if (r > 0)
1416 return -r; /* already warned in path_set_acl */
1417
1418 /* The above procfs paths don't work if /proc is not mounted. */
1419 if (r == -ENOENT && proc_mounted() == 0)
1420 r = -ENOSYS;
1421
1422 if (r < 0)
1423 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1424 #endif
1425 return r;
1426 }
1427
1428 static int path_set_acls(
1429 Context *c,
1430 Item *item,
1431 const char *path,
1432 CreationMode creation) {
1433
1434 int r = 0;
1435 #if HAVE_ACL
1436 _cleanup_close_ int fd = -EBADF;
1437
1438 assert(c);
1439 assert(item);
1440 assert(path);
1441
1442 fd = path_open_safe(path);
1443 if (fd < 0)
1444 return fd;
1445
1446 r = fd_set_acls(c, item, fd, path, /* st= */ NULL, creation);
1447 #endif
1448 return r;
1449 }
1450
1451 static int parse_attribute_from_arg(Item *item) {
1452
1453 static const struct {
1454 char character;
1455 unsigned value;
1456 } attributes[] = {
1457 { 'A', FS_NOATIME_FL }, /* do not update atime */
1458 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1459 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1460 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1461 { 'c', FS_COMPR_FL }, /* Compress file */
1462 { 'd', FS_NODUMP_FL }, /* do not dump file */
1463 { 'e', FS_EXTENT_FL }, /* Extents */
1464 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1465 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1466 { 's', FS_SECRM_FL }, /* Secure deletion */
1467 { 'u', FS_UNRM_FL }, /* Undelete */
1468 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1469 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1470 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1471 { 'P', FS_PROJINHERIT_FL }, /* Inherit the quota project ID */
1472 };
1473
1474 enum {
1475 MODE_ADD,
1476 MODE_DEL,
1477 MODE_SET
1478 } mode = MODE_ADD;
1479
1480 unsigned value = 0, mask = 0;
1481 const char *p;
1482
1483 assert(item);
1484
1485 p = item->argument;
1486 if (p) {
1487 if (*p == '+') {
1488 mode = MODE_ADD;
1489 p++;
1490 } else if (*p == '-') {
1491 mode = MODE_DEL;
1492 p++;
1493 } else if (*p == '=') {
1494 mode = MODE_SET;
1495 p++;
1496 }
1497 }
1498
1499 if (isempty(p) && mode != MODE_SET)
1500 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1501 "Setting file attribute on '%s' needs an attribute specification.",
1502 item->path);
1503
1504 for (; p && *p ; p++) {
1505 unsigned i, v;
1506
1507 for (i = 0; i < ELEMENTSOF(attributes); i++)
1508 if (*p == attributes[i].character)
1509 break;
1510
1511 if (i >= ELEMENTSOF(attributes))
1512 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1513 "Unknown file attribute '%c' on '%s'.",
1514 *p, item->path);
1515
1516 v = attributes[i].value;
1517
1518 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1519
1520 mask |= v;
1521 }
1522
1523 if (mode == MODE_SET)
1524 mask |= CHATTR_ALL_FL;
1525
1526 assert(mask != 0);
1527
1528 item->attribute_mask = mask;
1529 item->attribute_value = value;
1530 item->attribute_set = true;
1531
1532 return 0;
1533 }
1534
1535 static int fd_set_attribute(
1536 Context *c,
1537 Item *item,
1538 int fd,
1539 const char *path,
1540 const struct stat *st,
1541 CreationMode creation) {
1542
1543 _cleanup_close_ int procfs_fd = -EBADF;
1544 struct stat stbuf;
1545 unsigned f;
1546 int r;
1547
1548 assert(c);
1549 assert(item);
1550 assert(fd >= 0);
1551 assert(path);
1552
1553 if (!item->attribute_set || item->attribute_mask == 0)
1554 return 0;
1555
1556 if (!st) {
1557 if (fstat(fd, &stbuf) < 0)
1558 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1559 st = &stbuf;
1560 }
1561
1562 /* Issuing the file attribute ioctls on device nodes is not safe, as that will be delivered to the
1563 * drivers, not the file system containing the device node. */
1564 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
1565 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1566 "Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
1567 path);
1568
1569 f = item->attribute_value & item->attribute_mask;
1570
1571 /* Mask away directory-specific flags */
1572 if (!S_ISDIR(st->st_mode))
1573 f &= ~FS_DIRSYNC_FL;
1574
1575 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1576 if (procfs_fd < 0)
1577 return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
1578
1579 unsigned previous, current;
1580 r = chattr_full(procfs_fd, NULL, f, item->attribute_mask, &previous, &current, CHATTR_FALLBACK_BITWISE);
1581 if (r == -ENOANO)
1582 log_warning("Cannot set file attributes for '%s', maybe due to incompatibility in specified attributes, "
1583 "previous=0x%08x, current=0x%08x, expected=0x%08x, ignoring.",
1584 path, previous, current, (previous & ~item->attribute_mask) | (f & item->attribute_mask));
1585 else if (r < 0)
1586 log_full_errno(ERRNO_IS_NOT_SUPPORTED(r) ? LOG_DEBUG : LOG_WARNING, r,
1587 "Cannot set file attributes for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1588 path, item->attribute_value, item->attribute_mask);
1589
1590 return 0;
1591 }
1592
1593 static int path_set_attribute(
1594 Context *c,
1595 Item *item,
1596 const char *path,
1597 CreationMode creation) {
1598
1599 _cleanup_close_ int fd = -EBADF;
1600
1601 assert(c);
1602 assert(item);
1603
1604 if (!item->attribute_set || item->attribute_mask == 0)
1605 return 0;
1606
1607 fd = path_open_safe(path);
1608 if (fd < 0)
1609 return fd;
1610
1611 return fd_set_attribute(c, item, fd, path, /* st= */ NULL, creation);
1612 }
1613
1614 static int write_argument_data(Item *i, int fd, const char *path) {
1615 int r;
1616
1617 assert(i);
1618 assert(fd >= 0);
1619 assert(path);
1620
1621 if (item_binary_argument_size(i) == 0)
1622 return 0;
1623
1624 assert(item_binary_argument(i));
1625
1626 log_debug("Writing to \"%s\".", path);
1627
1628 r = loop_write(fd, item_binary_argument(i), item_binary_argument_size(i));
1629 if (r < 0)
1630 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1631
1632 return 0;
1633 }
1634
1635 static int write_one_file(Context *c, Item *i, const char *path, CreationMode creation) {
1636 _cleanup_close_ int fd = -EBADF, dir_fd = -EBADF;
1637 _cleanup_free_ char *bn = NULL;
1638 int r;
1639
1640 assert(c);
1641 assert(i);
1642 assert(path);
1643 assert(i->type == WRITE_FILE);
1644
1645 r = path_extract_filename(path, &bn);
1646 if (r < 0)
1647 return log_error_errno(r, "Failed to extract filename from path '%s': %m", path);
1648 if (r == O_DIRECTORY)
1649 return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for writing, is a directory.", path);
1650
1651 /* Validate the path and keep the fd on the directory for opening the file so we're sure that it
1652 * can't be changed behind our back. */
1653 dir_fd = path_open_parent_safe(path, i->allow_failure);
1654 if (dir_fd < 0)
1655 return dir_fd;
1656
1657 /* Follows symlinks */
1658 fd = openat(dir_fd, bn,
1659 O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY|(i->append_or_force ? O_APPEND : 0),
1660 i->mode);
1661 if (fd < 0) {
1662 if (errno == ENOENT) {
1663 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1664 return 0;
1665 }
1666
1667 if (i->allow_failure)
1668 return log_debug_errno(errno, "Failed to open file \"%s\", ignoring: %m", path);
1669
1670 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1671 }
1672
1673 /* 'w' is allowed to write into any kind of files. */
1674
1675 r = write_argument_data(i, fd, path);
1676 if (r < 0)
1677 return r;
1678
1679 return fd_set_perms(c, i, fd, path, NULL, creation);
1680 }
1681
1682 static int create_file(
1683 Context *c,
1684 Item *i,
1685 const char *path) {
1686
1687 _cleanup_close_ int fd = -EBADF, dir_fd = -EBADF;
1688 _cleanup_free_ char *bn = NULL;
1689 struct stat stbuf, *st = NULL;
1690 CreationMode creation;
1691 int r = 0;
1692
1693 assert(c);
1694 assert(i);
1695 assert(path);
1696 assert(i->type == CREATE_FILE);
1697
1698 /* 'f' operates on regular files exclusively. */
1699
1700 r = path_extract_filename(path, &bn);
1701 if (r < 0)
1702 return log_error_errno(r, "Failed to extract filename from path '%s': %m", path);
1703 if (r == O_DIRECTORY)
1704 return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for writing, is a directory.", path);
1705
1706 /* Validate the path and keep the fd on the directory for opening the file so we're sure that it
1707 * can't be changed behind our back. */
1708 dir_fd = path_open_parent_safe(path, i->allow_failure);
1709 if (dir_fd < 0)
1710 return dir_fd;
1711
1712 WITH_UMASK(0000) {
1713 mac_selinux_create_file_prepare(path, S_IFREG);
1714 fd = RET_NERRNO(openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode));
1715 mac_selinux_create_file_clear();
1716 }
1717
1718 if (fd < 0) {
1719 /* Even on a read-only filesystem, open(2) returns EEXIST if the file already exists. It
1720 * returns EROFS only if it needs to create the file. */
1721 if (fd != -EEXIST)
1722 return log_error_errno(fd, "Failed to create file %s: %m", path);
1723
1724 /* Re-open the file. At that point it must exist since open(2) failed with EEXIST. We still
1725 * need to check if the perms/mode need to be changed. For read-only filesystems, we let
1726 * fd_set_perms() report the error if the perms need to be modified. */
1727 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1728 if (fd < 0)
1729 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1730
1731 if (fstat(fd, &stbuf) < 0)
1732 return log_error_errno(errno, "stat(%s) failed: %m", path);
1733
1734 if (!S_ISREG(stbuf.st_mode))
1735 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1736 "%s exists and is not a regular file.",
1737 path);
1738
1739 st = &stbuf;
1740 creation = CREATION_EXISTING;
1741 } else {
1742 r = write_argument_data(i, fd, path);
1743 if (r < 0)
1744 return r;
1745
1746 creation = CREATION_NORMAL;
1747 }
1748
1749 return fd_set_perms(c, i, fd, path, st, creation);
1750 }
1751
1752 static int truncate_file(
1753 Context *c,
1754 Item *i,
1755 const char *path) {
1756
1757 _cleanup_close_ int fd = -EBADF, dir_fd = -EBADF;
1758 _cleanup_free_ char *bn = NULL;
1759 struct stat stbuf, *st = NULL;
1760 CreationMode creation;
1761 bool erofs = false;
1762 int r = 0;
1763
1764 assert(c);
1765 assert(i);
1766 assert(path);
1767 assert(i->type == TRUNCATE_FILE || (i->type == CREATE_FILE && i->append_or_force));
1768
1769 /* We want to operate on regular file exclusively especially since O_TRUNC is unspecified if the file
1770 * is neither a regular file nor a fifo nor a terminal device. Therefore we first open the file and
1771 * make sure it's a regular one before truncating it. */
1772
1773 r = path_extract_filename(path, &bn);
1774 if (r < 0)
1775 return log_error_errno(r, "Failed to extract filename from path '%s': %m", path);
1776 if (r == O_DIRECTORY)
1777 return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for truncation, is a directory.", path);
1778
1779 /* Validate the path and keep the fd on the directory for opening the file so we're sure that it
1780 * can't be changed behind our back. */
1781 dir_fd = path_open_parent_safe(path, i->allow_failure);
1782 if (dir_fd < 0)
1783 return dir_fd;
1784
1785 creation = CREATION_EXISTING;
1786 fd = RET_NERRNO(openat(dir_fd, bn, O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode));
1787 if (fd == -ENOENT) {
1788 creation = CREATION_NORMAL; /* Didn't work without O_CREATE, try again with */
1789
1790 WITH_UMASK(0000) {
1791 mac_selinux_create_file_prepare(path, S_IFREG);
1792 fd = RET_NERRNO(openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode));
1793 mac_selinux_create_file_clear();
1794 }
1795 }
1796
1797 if (fd < 0) {
1798 if (fd != -EROFS)
1799 return log_error_errno(fd, "Failed to open/create file %s: %m", path);
1800
1801 /* On a read-only filesystem, we don't want to fail if the target is already empty and the
1802 * perms are set. So we still proceed with the sanity checks and let the remaining operations
1803 * fail with EROFS if they try to modify the target file. */
1804
1805 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1806 if (fd < 0) {
1807 if (errno == ENOENT)
1808 return log_error_errno(SYNTHETIC_ERRNO(EROFS),
1809 "Cannot create file %s on a read-only file system.",
1810 path);
1811
1812 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1813 }
1814
1815 erofs = true;
1816 creation = CREATION_EXISTING;
1817 }
1818
1819 if (fstat(fd, &stbuf) < 0)
1820 return log_error_errno(errno, "stat(%s) failed: %m", path);
1821
1822 if (!S_ISREG(stbuf.st_mode))
1823 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1824 "%s exists and is not a regular file.",
1825 path);
1826
1827 if (stbuf.st_size > 0) {
1828 if (ftruncate(fd, 0) < 0) {
1829 r = erofs ? -EROFS : -errno;
1830 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1831 }
1832 } else
1833 st = &stbuf;
1834
1835 log_debug("\"%s\" has been created.", path);
1836
1837 if (item_binary_argument(i)) {
1838 r = write_argument_data(i, fd, path);
1839 if (r < 0)
1840 return r;
1841 }
1842
1843 return fd_set_perms(c, i, fd, path, st, creation);
1844 }
1845
1846 static int copy_files(Context *c, Item *i) {
1847 _cleanup_close_ int dfd = -EBADF, fd = -EBADF;
1848 _cleanup_free_ char *bn = NULL;
1849 struct stat st, a;
1850 int r;
1851
1852 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1853
1854 r = path_extract_filename(i->path, &bn);
1855 if (r < 0)
1856 return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path);
1857
1858 /* Validate the path and use the returned directory fd for copying the target so we're sure that the
1859 * path can't be changed behind our back. */
1860 dfd = path_open_parent_safe(i->path, i->allow_failure);
1861 if (dfd < 0)
1862 return dfd;
1863
1864 r = copy_tree_at(AT_FDCWD, i->argument,
1865 dfd, bn,
1866 i->uid_set ? i->uid : UID_INVALID,
1867 i->gid_set ? i->gid : GID_INVALID,
1868 COPY_REFLINK | ((i->append_or_force) ? COPY_MERGE : COPY_MERGE_EMPTY) | COPY_MAC_CREATE | COPY_HARDLINKS,
1869 NULL, NULL);
1870
1871 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1872 if (fd < 0) {
1873 if (r < 0) /* Look at original error first */
1874 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1875
1876 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1877 }
1878
1879 if (fstat(fd, &st) < 0)
1880 return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
1881
1882 if (stat(i->argument, &a) < 0)
1883 return log_error_errno(errno, "Failed to stat(%s): %m", i->argument);
1884
1885 if (((st.st_mode ^ a.st_mode) & S_IFMT) != 0) {
1886 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1887 return 0;
1888 }
1889
1890 return fd_set_perms(c, i, fd, i->path, &st, _CREATION_MODE_INVALID);
1891 }
1892
1893 static int create_directory_or_subvolume(
1894 const char *path,
1895 mode_t mode,
1896 bool subvol,
1897 bool allow_failure,
1898 struct stat *ret_st,
1899 CreationMode *ret_creation) {
1900
1901 _cleanup_free_ char *bn = NULL;
1902 _cleanup_close_ int pfd = -EBADF;
1903 CreationMode creation;
1904 struct stat st;
1905 int r, fd;
1906
1907 assert(path);
1908
1909 r = path_extract_filename(path, &bn);
1910 if (r < 0)
1911 return log_error_errno(r, "Failed to extract filename from path '%s': %m", path);
1912
1913 pfd = path_open_parent_safe(path, allow_failure);
1914 if (pfd < 0)
1915 return pfd;
1916
1917 if (subvol) {
1918 r = getenv_bool("SYSTEMD_TMPFILES_FORCE_SUBVOL");
1919 if (r < 0) {
1920 if (r != -ENXIO) /* env var is unset */
1921 log_warning_errno(r, "Cannot parse value of $SYSTEMD_TMPFILES_FORCE_SUBVOL, ignoring.");
1922 r = btrfs_is_subvol(empty_to_root(arg_root)) > 0;
1923 }
1924 if (r == 0)
1925 /* Don't create a subvolume unless the root directory is one, too. We do this under
1926 * the assumption that if the root directory is just a plain directory (i.e. very
1927 * light-weight), we shouldn't try to split it up into subvolumes (i.e. more
1928 * heavy-weight). Thus, chroot() environments and suchlike will get a full brtfs
1929 * subvolume set up below their tree only if they specifically set up a btrfs
1930 * subvolume for the root dir too. */
1931
1932 subvol = false;
1933 else {
1934 WITH_UMASK((~mode) & 0777)
1935 r = btrfs_subvol_make(pfd, bn);
1936 }
1937 } else
1938 r = 0;
1939
1940 if (!subvol || ERRNO_IS_NEG_NOT_SUPPORTED(r))
1941 WITH_UMASK(0000)
1942 r = mkdirat_label(pfd, bn, mode);
1943
1944 creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING;
1945
1946 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_DIRECTORY|O_PATH);
1947 if (fd < 0) {
1948 /* We couldn't open it because it is not actually a directory? */
1949 if (errno == ENOTDIR)
1950 return log_error_errno(SYNTHETIC_ERRNO(EEXIST), "\"%s\" already exists and is not a directory.", path);
1951
1952 /* Then look at the original error */
1953 if (r < 0)
1954 return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR,
1955 r,
1956 "Failed to create directory or subvolume \"%s\"%s: %m",
1957 path,
1958 allow_failure ? ", ignoring" : "");
1959
1960 return log_error_errno(errno, "Failed to open directory/subvolume we just created '%s': %m", path);
1961 }
1962
1963 if (fstat(fd, &st) < 0)
1964 return log_error_errno(errno, "Failed to fstat(%s): %m", path);
1965
1966 assert(S_ISDIR(st.st_mode)); /* we used O_DIRECTORY above */
1967
1968 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(creation), path);
1969
1970 if (ret_st)
1971 *ret_st = st;
1972 if (ret_creation)
1973 *ret_creation = creation;
1974
1975 return fd;
1976 }
1977
1978 static int create_directory(
1979 Context *c,
1980 Item *i,
1981 const char *path) {
1982
1983 _cleanup_close_ int fd = -EBADF;
1984 CreationMode creation;
1985 struct stat st;
1986
1987 assert(c);
1988 assert(i);
1989 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
1990
1991 fd = create_directory_or_subvolume(path, i->mode, /* subvol= */ false, i->allow_failure, &st, &creation);
1992 if (fd == -EEXIST)
1993 return 0;
1994 if (fd < 0)
1995 return fd;
1996
1997 return fd_set_perms(c, i, fd, path, &st, creation);
1998 }
1999
2000 static int create_subvolume(
2001 Context *c,
2002 Item *i,
2003 const char *path) {
2004
2005 _cleanup_close_ int fd = -EBADF;
2006 CreationMode creation;
2007 struct stat st;
2008 int r, q = 0;
2009
2010 assert(c);
2011 assert(i);
2012 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
2013
2014 fd = create_directory_or_subvolume(path, i->mode, /* subvol = */ true, i->allow_failure, &st, &creation);
2015 if (fd == -EEXIST)
2016 return 0;
2017 if (fd < 0)
2018 return fd;
2019
2020 if (creation == CREATION_NORMAL &&
2021 IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
2022 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
2023 if (r == -ENOTTY)
2024 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
2025 else if (r == -EROFS)
2026 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
2027 else if (r == -ENOTCONN)
2028 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
2029 else if (r < 0)
2030 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
2031 else if (r > 0)
2032 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
2033 else if (r == 0)
2034 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
2035 }
2036
2037 r = fd_set_perms(c, i, fd, path, &st, creation);
2038 if (q < 0) /* prefer the quota change error from above */
2039 return q;
2040
2041 return r;
2042 }
2043
2044 static int empty_directory(
2045 Context *c,
2046 Item *i,
2047 const char *path,
2048 CreationMode creation) {
2049
2050 _cleanup_close_ int fd = -EBADF;
2051 struct stat st;
2052 int r;
2053
2054 assert(c);
2055 assert(i);
2056 assert(i->type == EMPTY_DIRECTORY);
2057
2058 r = chase(path, arg_root, CHASE_SAFE|CHASE_WARN, NULL, &fd);
2059 if (r == -ENOLINK) /* Unsafe symlink: already covered by CHASE_WARN */
2060 return r;
2061 if (r == -ENOENT) {
2062 /* Option "e" operates only on existing objects. Do not print errors about non-existent files
2063 * or directories */
2064 log_debug_errno(r, "Skipping missing directory: %s", path);
2065 return 0;
2066 }
2067 if (r < 0)
2068 return log_error_errno(r, "Failed to open directory '%s': %m", path);
2069
2070 if (fstat(fd, &st) < 0)
2071 return log_error_errno(errno, "Failed to fstat(%s): %m", path);
2072 if (!S_ISDIR(st.st_mode)) {
2073 log_warning("'%s' already exists and is not a directory.", path);
2074 return 0;
2075 }
2076
2077 return fd_set_perms(c, i, fd, path, &st, creation);
2078 }
2079
2080 static int create_device(
2081 Context *c,
2082 Item *i,
2083 mode_t file_type) {
2084
2085 _cleanup_close_ int dfd = -EBADF, fd = -EBADF;
2086 _cleanup_free_ char *bn = NULL;
2087 CreationMode creation;
2088 struct stat st;
2089 int r;
2090
2091 assert(c);
2092 assert(i);
2093 assert(IN_SET(i->type, CREATE_BLOCK_DEVICE, CREATE_CHAR_DEVICE));
2094 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
2095
2096 r = path_extract_filename(i->path, &bn);
2097 if (r < 0)
2098 return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path);
2099 if (r == O_DIRECTORY)
2100 return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for creating device node, is a directory.", i->path);
2101
2102 /* Validate the path and use the returned directory fd for copying the target so we're sure that the
2103 * path can't be changed behind our back. */
2104 dfd = path_open_parent_safe(i->path, i->allow_failure);
2105 if (dfd < 0)
2106 return dfd;
2107
2108 WITH_UMASK(0000) {
2109 mac_selinux_create_file_prepare(i->path, file_type);
2110 r = RET_NERRNO(mknodat(dfd, bn, i->mode | file_type, i->major_minor));
2111 mac_selinux_create_file_clear();
2112 }
2113 creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING;
2114
2115 /* Try to open the inode via O_PATH, regardless if we could create it or not. Maybe everything is in
2116 * order anyway and we hence can ignore the error to create the device node */
2117 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
2118 if (fd < 0) {
2119 /* OK, so opening the inode failed, let's look at the original error then. */
2120
2121 if (r < 0) {
2122 if (ERRNO_IS_PRIVILEGE(r))
2123 goto handle_privilege;
2124
2125 return log_error_errno(r, "Failed to create device node '%s': %m", i->path);
2126 }
2127
2128 return log_error_errno(errno, "Failed to open device node '%s' we just created: %m", i->path);
2129 }
2130
2131 if (fstat(fd, &st) < 0)
2132 return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
2133
2134 if (((st.st_mode ^ file_type) & S_IFMT) != 0) {
2135
2136 if (i->append_or_force) {
2137 fd = safe_close(fd);
2138
2139 WITH_UMASK(0000) {
2140 mac_selinux_create_file_prepare(i->path, file_type);
2141 r = mknodat_atomic(dfd, bn, i->mode | file_type, i->major_minor);
2142 mac_selinux_create_file_clear();
2143 }
2144 if (ERRNO_IS_PRIVILEGE(r))
2145 goto handle_privilege;
2146 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2147 r = rm_rf_child(dfd, bn, REMOVE_PHYSICAL);
2148 if (r < 0)
2149 return log_error_errno(r, "rm -rf %s failed: %m", i->path);
2150
2151 mac_selinux_create_file_prepare(i->path, file_type);
2152 r = RET_NERRNO(mknodat(dfd, bn, i->mode | file_type, i->major_minor));
2153 mac_selinux_create_file_clear();
2154 }
2155 if (r < 0)
2156 return log_error_errno(r, "Failed to create device node '%s': %m", i->path);
2157
2158 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
2159 if (fd < 0)
2160 return log_error_errno(errno, "Failed to open device node we just created '%s': %m", i->path);
2161
2162 /* Validate type before change ownership below */
2163 if (fstat(fd, &st) < 0)
2164 return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
2165
2166 if (((st.st_mode ^ file_type) & S_IFMT) != 0)
2167 return log_error_errno(SYNTHETIC_ERRNO(EBADF), "Device node we just created is not a device node, refusing.");
2168
2169 creation = CREATION_FORCE;
2170 } else {
2171 log_warning("\"%s\" already exists and is not a device node.", i->path);
2172 return 0;
2173 }
2174 }
2175
2176 log_debug("%s %s device node \"%s\" %u:%u.",
2177 creation_mode_verb_to_string(creation),
2178 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
2179 i->path, major(i->mode), minor(i->mode));
2180
2181 return fd_set_perms(c, i, fd, i->path, &st, creation);
2182
2183 handle_privilege:
2184 log_debug_errno(r,
2185 "We lack permissions, possibly because of cgroup configuration; "
2186 "skipping creation of device node '%s'.", i->path);
2187 return 0;
2188 }
2189
2190 static int create_fifo(Context *c, Item *i) {
2191 _cleanup_close_ int pfd = -EBADF, fd = -EBADF;
2192 _cleanup_free_ char *bn = NULL;
2193 CreationMode creation;
2194 struct stat st;
2195 int r;
2196
2197 assert(c);
2198 assert(i);
2199 assert(i->type == CREATE_FIFO);
2200
2201 r = path_extract_filename(i->path, &bn);
2202 if (r < 0)
2203 return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path);
2204 if (r == O_DIRECTORY)
2205 return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for creating FIFO, is a directory.", i->path);
2206
2207 pfd = path_open_parent_safe(i->path, i->allow_failure);
2208 if (pfd < 0)
2209 return pfd;
2210
2211 WITH_UMASK(0000) {
2212 mac_selinux_create_file_prepare(i->path, S_IFIFO);
2213 r = RET_NERRNO(mkfifoat(pfd, bn, i->mode));
2214 mac_selinux_create_file_clear();
2215 }
2216
2217 creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING;
2218
2219 /* Open the inode via O_PATH, regardless if we managed to create it or not. Maybe it is already the FIFO we want */
2220 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
2221 if (fd < 0) {
2222 if (r < 0)
2223 return log_error_errno(r, "Failed to create FIFO %s: %m", i->path); /* original error! */
2224
2225 return log_error_errno(errno, "Failed to open FIFO we just created %s: %m", i->path);
2226 }
2227
2228 if (fstat(fd, &st) < 0)
2229 return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
2230
2231 if (!S_ISFIFO(st.st_mode)) {
2232
2233 if (i->append_or_force) {
2234 fd = safe_close(fd);
2235
2236 WITH_UMASK(0000) {
2237 mac_selinux_create_file_prepare(i->path, S_IFIFO);
2238 r = mkfifoat_atomic(pfd, bn, i->mode);
2239 mac_selinux_create_file_clear();
2240 }
2241 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2242 r = rm_rf_child(pfd, bn, REMOVE_PHYSICAL);
2243 if (r < 0)
2244 return log_error_errno(r, "rm -rf %s failed: %m", i->path);
2245
2246 mac_selinux_create_file_prepare(i->path, S_IFIFO);
2247 r = RET_NERRNO(mkfifoat(pfd, bn, i->mode));
2248 mac_selinux_create_file_clear();
2249 }
2250 if (r < 0)
2251 return log_error_errno(r, "Failed to create FIFO %s: %m", i->path);
2252
2253 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
2254 if (fd < 0)
2255 return log_error_errno(errno, "Failed to open FIFO we just created '%s': %m", i->path);
2256
2257 /* Validate type before change ownership below */
2258 if (fstat(fd, &st) < 0)
2259 return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
2260
2261 if (!S_ISFIFO(st.st_mode))
2262 return log_error_errno(SYNTHETIC_ERRNO(EBADF), "FIFO inode we just created is not a FIFO, refusing.");
2263
2264 creation = CREATION_FORCE;
2265 } else {
2266 log_warning("\"%s\" already exists and is not a FIFO.", i->path);
2267 return 0;
2268 }
2269 }
2270
2271 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), i->path);
2272
2273 return fd_set_perms(c, i, fd, i->path, &st, creation);
2274 }
2275
2276 static int create_symlink(Context *c, Item *i) {
2277 _cleanup_close_ int pfd = -EBADF, fd = -EBADF;
2278 _cleanup_free_ char *bn = NULL;
2279 CreationMode creation;
2280 struct stat st;
2281 bool good = false;
2282 int r;
2283
2284 assert(c);
2285 assert(i);
2286
2287 r = path_extract_filename(i->path, &bn);
2288 if (r < 0)
2289 return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path);
2290 if (r == O_DIRECTORY)
2291 return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for creating FIFO, is a directory.", i->path);
2292
2293 pfd = path_open_parent_safe(i->path, i->allow_failure);
2294 if (pfd < 0)
2295 return pfd;
2296
2297 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2298 r = RET_NERRNO(symlinkat(i->argument, pfd, bn));
2299 mac_selinux_create_file_clear();
2300
2301 creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING;
2302
2303 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
2304 if (fd < 0) {
2305 if (r < 0)
2306 return log_error_errno(r, "Failed to create symlink '%s': %m", i->path); /* original error! */
2307
2308 return log_error_errno(errno, "Failed to open symlink we just created '%s': %m", i->path);
2309 }
2310
2311 if (fstat(fd, &st) < 0)
2312 return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
2313
2314 if (S_ISLNK(st.st_mode)) {
2315 _cleanup_free_ char *x = NULL;
2316
2317 r = readlinkat_malloc(fd, "", &x);
2318 if (r < 0)
2319 return log_error_errno(r, "readlinkat(%s) failed: %m", i->path);
2320
2321 good = streq(x, i->argument);
2322 } else
2323 good = false;
2324
2325 if (!good) {
2326 if (!i->append_or_force) {
2327 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2328 return 0;
2329 }
2330
2331 fd = safe_close(fd);
2332
2333 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2334 r = symlinkat_atomic_full(i->argument, pfd, bn, /* make_relative= */ false);
2335 mac_selinux_create_file_clear();
2336 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2337 r = rm_rf_child(pfd, bn, REMOVE_PHYSICAL);
2338 if (r < 0)
2339 return log_error_errno(r, "rm -rf %s failed: %m", i->path);
2340
2341 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2342 r = RET_NERRNO(symlinkat(i->argument, pfd, i->path));
2343 mac_selinux_create_file_clear();
2344 }
2345 if (r < 0)
2346 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2347
2348 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
2349 if (fd < 0)
2350 return log_error_errno(errno, "Failed to open symlink we just created '%s': %m", i->path);
2351
2352 /* Validate type before change ownership below */
2353 if (fstat(fd, &st) < 0)
2354 return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
2355
2356 if (!S_ISLNK(st.st_mode))
2357 return log_error_errno(SYNTHETIC_ERRNO(EBADF), "Symlink we just created is not a symlink, refusing.");
2358
2359 creation = CREATION_FORCE;
2360 }
2361
2362 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2363 return fd_set_perms(c, i, fd, i->path, &st, creation);
2364 }
2365
2366 typedef int (*action_t)(Context *c, Item *i, const char *path, CreationMode creation);
2367 typedef int (*fdaction_t)(Context *c, Item *i, int fd, const char *path, const struct stat *st, CreationMode creation);
2368
2369 static int item_do(
2370 Context *c,
2371 Item *i,
2372 int fd,
2373 const char *path,
2374 CreationMode creation,
2375 fdaction_t action) {
2376
2377 struct stat st;
2378 int r = 0, q;
2379
2380 assert(c);
2381 assert(i);
2382 assert(path);
2383 assert(fd >= 0);
2384
2385 if (fstat(fd, &st) < 0) {
2386 r = log_error_errno(errno, "fstat() on file failed: %m");
2387 goto finish;
2388 }
2389
2390 /* This returns the first error we run into, but nevertheless tries to go on */
2391 r = action(c, i, fd, path, &st, creation);
2392
2393 if (S_ISDIR(st.st_mode)) {
2394 _cleanup_closedir_ DIR *d = NULL;
2395
2396 /* The passed 'fd' was opened with O_PATH. We need to convert it into a 'regular' fd before
2397 * reading the directory content. */
2398 d = opendir(FORMAT_PROC_FD_PATH(fd));
2399 if (!d) {
2400 log_error_errno(errno, "Failed to opendir() '%s': %m", FORMAT_PROC_FD_PATH(fd));
2401 if (r == 0)
2402 r = -errno;
2403 goto finish;
2404 }
2405
2406 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
2407 int de_fd;
2408
2409 if (dot_or_dot_dot(de->d_name))
2410 continue;
2411
2412 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
2413 if (de_fd < 0)
2414 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
2415 else {
2416 _cleanup_free_ char *de_path = NULL;
2417
2418 de_path = path_join(path, de->d_name);
2419 if (!de_path)
2420 q = log_oom();
2421 else
2422 /* Pass ownership of dirent fd over */
2423 q = item_do(c, i, de_fd, de_path, CREATION_EXISTING, action);
2424 }
2425
2426 if (q < 0 && r == 0)
2427 r = q;
2428 }
2429 }
2430 finish:
2431 safe_close(fd);
2432 return r;
2433 }
2434
2435 static int glob_item(Context *c, Item *i, action_t action) {
2436 _cleanup_globfree_ glob_t g = {
2437 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
2438 };
2439 int r = 0, k;
2440
2441 assert(c);
2442 assert(i);
2443
2444 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
2445 if (k < 0 && k != -ENOENT)
2446 return log_error_errno(k, "glob(%s) failed: %m", i->path);
2447
2448 STRV_FOREACH(fn, g.gl_pathv) {
2449 /* We pass CREATION_EXISTING here, since if we are globbing for it, it always has to exist */
2450 k = action(c, i, *fn, CREATION_EXISTING);
2451 if (k < 0 && r == 0)
2452 r = k;
2453 }
2454
2455 return r;
2456 }
2457
2458 static int glob_item_recursively(
2459 Context *c,
2460 Item *i,
2461 fdaction_t action) {
2462
2463 _cleanup_globfree_ glob_t g = {
2464 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
2465 };
2466 int r = 0, k;
2467
2468 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
2469 if (k < 0 && k != -ENOENT)
2470 return log_error_errno(k, "glob(%s) failed: %m", i->path);
2471
2472 STRV_FOREACH(fn, g.gl_pathv) {
2473 _cleanup_close_ int fd = -EBADF;
2474
2475 /* Make sure we won't trigger/follow file object (such as
2476 * device nodes, automounts, ...) pointed out by 'fn' with
2477 * O_PATH. Note, when O_PATH is used, flags other than
2478 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
2479
2480 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
2481 if (fd < 0) {
2482 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
2483 if (r == 0)
2484 r = -errno;
2485 continue;
2486 }
2487
2488 k = item_do(c, i, fd, *fn, CREATION_EXISTING, action);
2489 if (k < 0 && r == 0)
2490 r = k;
2491
2492 /* we passed fd ownership to the previous call */
2493 fd = -EBADF;
2494 }
2495
2496 return r;
2497 }
2498
2499 static int rm_if_wrong_type_safe(
2500 mode_t mode,
2501 int parent_fd,
2502 const struct stat *parent_st, /* Only used if follow_links below is true. */
2503 const char *name,
2504 int flags) {
2505 _cleanup_free_ char *parent_name = NULL;
2506 bool follow_links = !FLAGS_SET(flags, AT_SYMLINK_NOFOLLOW);
2507 struct stat st;
2508 int r;
2509
2510 assert(name);
2511 assert((mode & ~S_IFMT) == 0);
2512 assert(!follow_links || parent_st);
2513 assert((flags & ~AT_SYMLINK_NOFOLLOW) == 0);
2514
2515 if (!filename_is_valid(name))
2516 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "\"%s\" is not a valid filename.", name);
2517
2518 r = fstatat_harder(parent_fd, name, &st, flags, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
2519 if (r < 0) {
2520 (void) fd_get_path(parent_fd, &parent_name);
2521 return log_full_errno(r == -ENOENT? LOG_DEBUG : LOG_ERR, r,
2522 "Failed to stat \"%s\" at \"%s\": %m", name, strna(parent_name));
2523 }
2524
2525 /* Fail before removing anything if this is an unsafe transition. */
2526 if (follow_links && unsafe_transition(parent_st, &st)) {
2527 (void) fd_get_path(parent_fd, &parent_name);
2528 return log_error_errno(SYNTHETIC_ERRNO(ENOLINK),
2529 "Unsafe transition from \"%s\" to \"%s\".", parent_name, name);
2530 }
2531
2532 if ((st.st_mode & S_IFMT) == mode)
2533 return 0;
2534
2535 (void) fd_get_path(parent_fd, &parent_name);
2536 log_notice("Wrong file type 0o%o; rm -rf \"%s/%s\"", st.st_mode & S_IFMT, strna(parent_name), name);
2537
2538 /* If the target of the symlink was the wrong type, the link needs to be removed instead of the
2539 * target, so make sure it is identified as a link and not a directory. */
2540 if (follow_links) {
2541 r = fstatat_harder(parent_fd, name, &st, AT_SYMLINK_NOFOLLOW, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
2542 if (r < 0)
2543 return log_error_errno(r, "Failed to stat \"%s\" at \"%s\": %m", name, strna(parent_name));
2544 }
2545
2546 /* Do not remove mount points. */
2547 r = fd_is_mount_point(parent_fd, name, follow_links ? AT_SYMLINK_FOLLOW : 0);
2548 if (r < 0)
2549 (void) log_warning_errno(r, "Failed to check if \"%s/%s\" is a mount point: %m; Continuing",
2550 strna(parent_name), name);
2551 else if (r > 0)
2552 return log_error_errno(SYNTHETIC_ERRNO(EBUSY),
2553 "Not removing \"%s/%s\" because it is a mount point.", strna(parent_name), name);
2554
2555 if ((st.st_mode & S_IFMT) == S_IFDIR) {
2556 _cleanup_close_ int child_fd = -EBADF;
2557
2558 child_fd = openat(parent_fd, name, O_NOCTTY | O_CLOEXEC | O_DIRECTORY);
2559 if (child_fd < 0)
2560 return log_error_errno(errno, "Failed to open \"%s\" at \"%s\": %m", name, strna(parent_name));
2561
2562 r = rm_rf_children(TAKE_FD(child_fd), REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL, &st);
2563 if (r < 0)
2564 return log_error_errno(r, "Failed to remove contents of \"%s\" at \"%s\": %m", name, strna(parent_name));
2565
2566 r = unlinkat_harder(parent_fd, name, AT_REMOVEDIR, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
2567 } else
2568 r = unlinkat_harder(parent_fd, name, 0, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
2569 if (r < 0)
2570 return log_error_errno(r, "Failed to remove \"%s\" at \"%s\": %m", name, strna(parent_name));
2571
2572 /* This is covered by the log_notice "Wrong file type..." It is logged earlier because it gives
2573 * context to other error messages that might follow. */
2574 return -ENOENT;
2575 }
2576
2577 /* If child_mode is non-zero, rm_if_wrong_type_safe will be executed for the last path component. */
2578 static int mkdir_parents_rm_if_wrong_type(mode_t child_mode, const char *path) {
2579 _cleanup_close_ int parent_fd = -EBADF;
2580 struct stat parent_st;
2581 size_t path_len;
2582 int r;
2583
2584 assert(path);
2585 assert((child_mode & ~S_IFMT) == 0);
2586
2587 path_len = strlen(path);
2588
2589 if (!is_path(path))
2590 /* rm_if_wrong_type_safe already logs errors. */
2591 return child_mode != 0 ? rm_if_wrong_type_safe(child_mode, AT_FDCWD, NULL, path, AT_SYMLINK_NOFOLLOW) : 0;
2592
2593 if (child_mode != 0 && endswith(path, "/"))
2594 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2595 "Trailing path separators are only allowed if child_mode is not set; got \"%s\"", path);
2596
2597 /* Get the parent_fd and stat. */
2598 parent_fd = openat(AT_FDCWD, path_is_absolute(path) ? "/" : ".", O_NOCTTY | O_CLOEXEC | O_DIRECTORY);
2599 if (parent_fd < 0)
2600 return log_error_errno(errno, "Failed to open root: %m");
2601
2602 if (fstat(parent_fd, &parent_st) < 0)
2603 return log_error_errno(errno, "Failed to stat root: %m");
2604
2605 /* Check every parent directory in the path, except the last component */
2606 for (const char *e = path;;) {
2607 _cleanup_close_ int next_fd = -EBADF;
2608 char t[path_len + 1];
2609 const char *s;
2610
2611 /* Find the start of the next path component. */
2612 s = e + strspn(e, "/");
2613 /* Find the end of the next path component. */
2614 e = s + strcspn(s, "/");
2615
2616 /* Copy the path component to t so it can be a null terminated string. */
2617 *((char*) mempcpy(t, s, e - s)) = 0;
2618
2619 /* Is this the last component? If so, then check the type */
2620 if (*e == 0)
2621 return child_mode != 0 ? rm_if_wrong_type_safe(child_mode, parent_fd, &parent_st, t, AT_SYMLINK_NOFOLLOW) : 0;
2622
2623 r = rm_if_wrong_type_safe(S_IFDIR, parent_fd, &parent_st, t, 0);
2624 /* Remove dangling symlinks. */
2625 if (r == -ENOENT)
2626 r = rm_if_wrong_type_safe(S_IFDIR, parent_fd, &parent_st, t, AT_SYMLINK_NOFOLLOW);
2627 if (r == -ENOENT) {
2628 WITH_UMASK(0000)
2629 r = mkdirat_label(parent_fd, t, 0755);
2630 if (r < 0) {
2631 _cleanup_free_ char *parent_name = NULL;
2632
2633 (void) fd_get_path(parent_fd, &parent_name);
2634 return log_error_errno(r, "Failed to mkdir \"%s\" at \"%s\": %m", t, strnull(parent_name));
2635 }
2636 } else if (r < 0)
2637 /* rm_if_wrong_type_safe already logs errors. */
2638 return r;
2639
2640 next_fd = RET_NERRNO(openat(parent_fd, t, O_NOCTTY | O_CLOEXEC | O_DIRECTORY));
2641 if (next_fd < 0) {
2642 _cleanup_free_ char *parent_name = NULL;
2643
2644 (void) fd_get_path(parent_fd, &parent_name);
2645 return log_error_errno(next_fd, "Failed to open \"%s\" at \"%s\": %m", t, strnull(parent_name));
2646 }
2647 r = RET_NERRNO(fstat(next_fd, &parent_st));
2648 if (r < 0) {
2649 _cleanup_free_ char *parent_name = NULL;
2650
2651 (void) fd_get_path(parent_fd, &parent_name);
2652 return log_error_errno(r, "Failed to stat \"%s\" at \"%s\": %m", t, strnull(parent_name));
2653 }
2654
2655 close_and_replace(parent_fd, next_fd);
2656 }
2657 }
2658
2659 static int mkdir_parents_item(Item *i, mode_t child_mode) {
2660 int r;
2661 if (i->try_replace) {
2662 r = mkdir_parents_rm_if_wrong_type(child_mode, i->path);
2663 if (r < 0 && r != -ENOENT)
2664 return r;
2665 } else
2666 WITH_UMASK(0000)
2667 (void) mkdir_parents_label(i->path, 0755);
2668
2669 return 0;
2670 }
2671
2672 static int create_item(Context *c, Item *i) {
2673 int r;
2674
2675 assert(c);
2676 assert(i);
2677
2678 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
2679
2680 switch (i->type) {
2681
2682 case IGNORE_PATH:
2683 case IGNORE_DIRECTORY_PATH:
2684 case REMOVE_PATH:
2685 case RECURSIVE_REMOVE_PATH:
2686 return 0;
2687
2688 case TRUNCATE_FILE:
2689 case CREATE_FILE:
2690 r = mkdir_parents_item(i, S_IFREG);
2691 if (r < 0)
2692 return r;
2693
2694 if ((i->type == CREATE_FILE && i->append_or_force) || i->type == TRUNCATE_FILE)
2695 r = truncate_file(c, i, i->path);
2696 else
2697 r = create_file(c, i, i->path);
2698 if (r < 0)
2699 return r;
2700 break;
2701
2702 case COPY_FILES:
2703 r = mkdir_parents_item(i, 0);
2704 if (r < 0)
2705 return r;
2706
2707 r = copy_files(c, i);
2708 if (r < 0)
2709 return r;
2710 break;
2711
2712 case WRITE_FILE:
2713 r = glob_item(c, i, write_one_file);
2714 if (r < 0)
2715 return r;
2716
2717 break;
2718
2719 case CREATE_DIRECTORY:
2720 case TRUNCATE_DIRECTORY:
2721 r = mkdir_parents_item(i, S_IFDIR);
2722 if (r < 0)
2723 return r;
2724
2725 r = create_directory(c, i, i->path);
2726 if (r < 0)
2727 return r;
2728 break;
2729
2730 case CREATE_SUBVOLUME:
2731 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2732 case CREATE_SUBVOLUME_NEW_QUOTA:
2733 r = mkdir_parents_item(i, S_IFDIR);
2734 if (r < 0)
2735 return r;
2736
2737 r = create_subvolume(c, i, i->path);
2738 if (r < 0)
2739 return r;
2740 break;
2741
2742 case EMPTY_DIRECTORY:
2743 r = glob_item(c, i, empty_directory);
2744 if (r < 0)
2745 return r;
2746 break;
2747
2748 case CREATE_FIFO:
2749 r = mkdir_parents_item(i, S_IFIFO);
2750 if (r < 0)
2751 return r;
2752
2753 r = create_fifo(c, i);
2754 if (r < 0)
2755 return r;
2756 break;
2757
2758 case CREATE_SYMLINK:
2759 r = mkdir_parents_item(i, S_IFLNK);
2760 if (r < 0)
2761 return r;
2762
2763 r = create_symlink(c, i);
2764 if (r < 0)
2765 return r;
2766
2767 break;
2768
2769 case CREATE_BLOCK_DEVICE:
2770 case CREATE_CHAR_DEVICE:
2771 if (have_effective_cap(CAP_MKNOD) <= 0) {
2772 /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
2773 * case to avoid noise, and we don't support virtualized devices in containers anyway. */
2774
2775 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2776 return 0;
2777 }
2778
2779 r = mkdir_parents_item(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2780 if (r < 0)
2781 return r;
2782
2783 r = create_device(c, i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2784 if (r < 0)
2785 return r;
2786
2787 break;
2788
2789 case ADJUST_MODE:
2790 case RELABEL_PATH:
2791 r = glob_item(c, i, path_set_perms);
2792 if (r < 0)
2793 return r;
2794 break;
2795
2796 case RECURSIVE_RELABEL_PATH:
2797 r = glob_item_recursively(c, i, fd_set_perms);
2798 if (r < 0)
2799 return r;
2800 break;
2801
2802 case SET_XATTR:
2803 r = glob_item(c, i, path_set_xattrs);
2804 if (r < 0)
2805 return r;
2806 break;
2807
2808 case RECURSIVE_SET_XATTR:
2809 r = glob_item_recursively(c, i, fd_set_xattrs);
2810 if (r < 0)
2811 return r;
2812 break;
2813
2814 case SET_ACL:
2815 r = glob_item(c, i, path_set_acls);
2816 if (r < 0)
2817 return r;
2818 break;
2819
2820 case RECURSIVE_SET_ACL:
2821 r = glob_item_recursively(c, i, fd_set_acls);
2822 if (r < 0)
2823 return r;
2824 break;
2825
2826 case SET_ATTRIBUTE:
2827 r = glob_item(c, i, path_set_attribute);
2828 if (r < 0)
2829 return r;
2830 break;
2831
2832 case RECURSIVE_SET_ATTRIBUTE:
2833 r = glob_item_recursively(c, i, fd_set_attribute);
2834 if (r < 0)
2835 return r;
2836 break;
2837 }
2838
2839 return 0;
2840 }
2841
2842 static int remove_item_instance(
2843 Context *c,
2844 Item *i,
2845 const char *instance,
2846 CreationMode creation) {
2847
2848 int r;
2849
2850 assert(c);
2851 assert(i);
2852
2853 switch (i->type) {
2854
2855 case REMOVE_PATH:
2856 if (remove(instance) < 0 && errno != ENOENT)
2857 return log_error_errno(errno, "rm(%s): %m", instance);
2858
2859 break;
2860
2861 case RECURSIVE_REMOVE_PATH:
2862 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2863 log_debug("rm -rf \"%s\"", instance);
2864 r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL);
2865 if (r < 0 && r != -ENOENT)
2866 return log_error_errno(r, "rm_rf(%s): %m", instance);
2867
2868 break;
2869
2870 default:
2871 assert_not_reached();
2872 }
2873
2874 return 0;
2875 }
2876
2877 static int remove_item(Context *c, Item *i) {
2878 int r;
2879
2880 assert(c);
2881 assert(i);
2882
2883 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
2884
2885 switch (i->type) {
2886
2887 case TRUNCATE_DIRECTORY:
2888 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2889 log_debug("rm -rf \"%s\"", i->path);
2890 r = rm_rf(i->path, REMOVE_PHYSICAL);
2891 if (r < 0 && r != -ENOENT)
2892 return log_error_errno(r, "rm_rf(%s): %m", i->path);
2893
2894 return 0;
2895
2896 case REMOVE_PATH:
2897 case RECURSIVE_REMOVE_PATH:
2898 return glob_item(c, i, remove_item_instance);
2899
2900 default:
2901 return 0;
2902 }
2903 }
2904
2905 static char *age_by_to_string(AgeBy ab, bool is_dir) {
2906 static const char ab_map[] = { 'a', 'b', 'c', 'm' };
2907 size_t j = 0;
2908 char *ret;
2909
2910 ret = new(char, ELEMENTSOF(ab_map) + 1);
2911 if (!ret)
2912 return NULL;
2913
2914 for (size_t i = 0; i < ELEMENTSOF(ab_map); i++)
2915 if (FLAGS_SET(ab, 1U << i))
2916 ret[j++] = is_dir ? ascii_toupper(ab_map[i]) : ab_map[i];
2917
2918 ret[j] = 0;
2919 return ret;
2920 }
2921
2922 static int clean_item_instance(
2923 Context *c,
2924 Item *i,
2925 const char* instance,
2926 CreationMode creation) {
2927
2928 _cleanup_closedir_ DIR *d = NULL;
2929 STRUCT_STATX_DEFINE(sx);
2930 int mountpoint, r;
2931 usec_t cutoff, n;
2932
2933 assert(i);
2934
2935 if (!i->age_set)
2936 return 0;
2937
2938 n = now(CLOCK_REALTIME);
2939 if (n < i->age)
2940 return 0;
2941
2942 cutoff = n - i->age;
2943
2944 d = opendir_nomod(instance);
2945 if (!d) {
2946 if (IN_SET(errno, ENOENT, ENOTDIR)) {
2947 log_debug_errno(errno, "Directory \"%s\": %m", instance);
2948 return 0;
2949 }
2950
2951 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
2952 }
2953
2954 r = statx_fallback(dirfd(d), "", AT_EMPTY_PATH, STATX_MODE|STATX_INO|STATX_ATIME|STATX_MTIME, &sx);
2955 if (r < 0)
2956 return log_error_errno(r, "statx(%s) failed: %m", instance);
2957
2958 if (FLAGS_SET(sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT))
2959 mountpoint = FLAGS_SET(sx.stx_attributes, STATX_ATTR_MOUNT_ROOT);
2960 else {
2961 struct stat ps;
2962
2963 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
2964 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
2965
2966 mountpoint =
2967 sx.stx_dev_major != major(ps.st_dev) ||
2968 sx.stx_dev_minor != minor(ps.st_dev) ||
2969 sx.stx_ino != ps.st_ino;
2970 }
2971
2972 if (DEBUG_LOGGING) {
2973 _cleanup_free_ char *ab_f = NULL, *ab_d = NULL;
2974
2975 ab_f = age_by_to_string(i->age_by_file, false);
2976 if (!ab_f)
2977 return log_oom();
2978
2979 ab_d = age_by_to_string(i->age_by_dir, true);
2980 if (!ab_d)
2981 return log_oom();
2982
2983 log_debug("Cleanup threshold for %s \"%s\" is %s; age-by: %s%s",
2984 mountpoint ? "mount point" : "directory",
2985 instance,
2986 FORMAT_TIMESTAMP_STYLE(cutoff, TIMESTAMP_US),
2987 ab_f, ab_d);
2988 }
2989
2990 return dir_cleanup(c, i, instance, d,
2991 load_statx_timestamp_nsec(&sx.stx_atime),
2992 load_statx_timestamp_nsec(&sx.stx_mtime),
2993 cutoff * NSEC_PER_USEC,
2994 sx.stx_dev_major, sx.stx_dev_minor, mountpoint,
2995 MAX_DEPTH, i->keep_first_level,
2996 i->age_by_file, i->age_by_dir);
2997 }
2998
2999 static int clean_item(Context *c, Item *i) {
3000 assert(c);
3001 assert(i);
3002
3003 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
3004
3005 switch (i->type) {
3006
3007 case CREATE_DIRECTORY:
3008 case CREATE_SUBVOLUME:
3009 case CREATE_SUBVOLUME_INHERIT_QUOTA:
3010 case CREATE_SUBVOLUME_NEW_QUOTA:
3011 case TRUNCATE_DIRECTORY:
3012 case IGNORE_PATH:
3013 case COPY_FILES:
3014 clean_item_instance(c, i, i->path, CREATION_EXISTING);
3015 return 0;
3016
3017 case EMPTY_DIRECTORY:
3018 case IGNORE_DIRECTORY_PATH:
3019 return glob_item(c, i, clean_item_instance);
3020
3021 default:
3022 return 0;
3023 }
3024 }
3025
3026 static int process_item(
3027 Context *c,
3028 Item *i,
3029 OperationMask operation) {
3030
3031 OperationMask todo;
3032 _cleanup_free_ char *_path = NULL;
3033 const char *path;
3034 int r, q, p;
3035
3036 assert(c);
3037 assert(i);
3038
3039 todo = operation & ~i->done;
3040 if (todo == 0) /* Everything already done? */
3041 return 0;
3042
3043 i->done |= operation;
3044
3045 path = i->path;
3046 if (string_is_glob(path)) {
3047 /* We can't easily check whether a glob matches any autofs path, so let's do the check only
3048 * for the non-glob part. */
3049
3050 r = glob_non_glob_prefix(path, &_path);
3051 if (r < 0 && r != -ENOENT)
3052 return log_debug_errno(r, "Failed to deglob path: %m");
3053 if (r >= 0)
3054 path = _path;
3055 }
3056
3057 r = chase(path, arg_root, CHASE_NO_AUTOFS|CHASE_NONEXISTENT|CHASE_WARN, NULL, NULL);
3058 if (r == -EREMOTE) {
3059 log_notice_errno(r, "Skipping %s", i->path); /* We log the configured path, to not confuse the user. */
3060 return 0;
3061 }
3062 if (r < 0)
3063 log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
3064
3065 r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(c, i) : 0;
3066 /* Failure can only be tolerated for create */
3067 if (i->allow_failure)
3068 r = 0;
3069
3070 q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(c, i) : 0;
3071 p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(c, i) : 0;
3072
3073 return r < 0 ? r :
3074 q < 0 ? q :
3075 p;
3076 }
3077
3078 static int process_item_array(
3079 Context *c,
3080 ItemArray *array,
3081 OperationMask operation) {
3082
3083 int r = 0;
3084 size_t n;
3085
3086 assert(c);
3087 assert(array);
3088
3089 /* Create any parent first. */
3090 if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
3091 r = process_item_array(c, array->parent, operation & OPERATION_CREATE);
3092
3093 /* Clean up all children first */
3094 if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) {
3095 ItemArray *cc;
3096
3097 SET_FOREACH(cc, array->children) {
3098 int k;
3099
3100 k = process_item_array(c, cc, operation & (OPERATION_REMOVE|OPERATION_CLEAN));
3101 if (k < 0 && r == 0)
3102 r = k;
3103 }
3104 }
3105
3106 for (n = 0; n < array->n_items; n++) {
3107 int k;
3108
3109 k = process_item(c, array->items + n, operation);
3110 if (k < 0 && r == 0)
3111 r = k;
3112 }
3113
3114 return r;
3115 }
3116
3117 static void item_free_contents(Item *i) {
3118 assert(i);
3119 free(i->path);
3120 free(i->argument);
3121 free(i->binary_argument);
3122 strv_free(i->xattrs);
3123
3124 #if HAVE_ACL
3125 if (i->acl_access)
3126 acl_free(i->acl_access);
3127
3128 if (i->acl_access_exec)
3129 acl_free(i->acl_access_exec);
3130
3131 if (i->acl_default)
3132 acl_free(i->acl_default);
3133 #endif
3134 }
3135
3136 static ItemArray* item_array_free(ItemArray *a) {
3137 size_t n;
3138
3139 if (!a)
3140 return NULL;
3141
3142 for (n = 0; n < a->n_items; n++)
3143 item_free_contents(a->items + n);
3144
3145 set_free(a->children);
3146 free(a->items);
3147 return mfree(a);
3148 }
3149
3150 static int item_compare(const Item *a, const Item *b) {
3151 /* Make sure that the ownership taking item is put first, so
3152 * that we first create the node, and then can adjust it */
3153
3154 if (takes_ownership(a->type) && !takes_ownership(b->type))
3155 return -1;
3156 if (!takes_ownership(a->type) && takes_ownership(b->type))
3157 return 1;
3158
3159 return CMP(a->type, b->type);
3160 }
3161
3162 static bool item_compatible(const Item *a, const Item *b) {
3163 assert(a);
3164 assert(b);
3165 assert(streq(a->path, b->path));
3166
3167 if (takes_ownership(a->type) && takes_ownership(b->type))
3168 /* check if the items are the same */
3169 return memcmp_nn(item_binary_argument(a), item_binary_argument_size(a),
3170 item_binary_argument(b), item_binary_argument_size(b)) == 0 &&
3171
3172 a->uid_set == b->uid_set &&
3173 a->uid == b->uid &&
3174 a->uid_only_create == b->uid_only_create &&
3175
3176 a->gid_set == b->gid_set &&
3177 a->gid == b->gid &&
3178 a->gid_only_create == b->gid_only_create &&
3179
3180 a->mode_set == b->mode_set &&
3181 a->mode == b->mode &&
3182 a->mode_only_create == b->mode_only_create &&
3183
3184 a->age_set == b->age_set &&
3185 a->age == b->age &&
3186
3187 a->age_by_file == b->age_by_file &&
3188 a->age_by_dir == b->age_by_dir &&
3189
3190 a->mask_perms == b->mask_perms &&
3191
3192 a->keep_first_level == b->keep_first_level &&
3193
3194 a->major_minor == b->major_minor;
3195
3196 return true;
3197 }
3198
3199 static bool should_include_path(const char *path) {
3200 STRV_FOREACH(prefix, arg_exclude_prefixes)
3201 if (path_startswith(path, *prefix)) {
3202 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
3203 path, *prefix);
3204 return false;
3205 }
3206
3207 STRV_FOREACH(prefix, arg_include_prefixes)
3208 if (path_startswith(path, *prefix)) {
3209 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
3210 return true;
3211 }
3212
3213 /* no matches, so we should include this path only if we have no allow list at all */
3214 if (strv_isempty(arg_include_prefixes))
3215 return true;
3216
3217 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
3218 return false;
3219 }
3220
3221 static int specifier_expansion_from_arg(const Specifier *specifier_table, Item *i) {
3222 int r;
3223
3224 assert(i);
3225
3226 if (!i->argument)
3227 return 0;
3228
3229 switch (i->type) {
3230 case COPY_FILES:
3231 case CREATE_SYMLINK:
3232 case CREATE_FILE:
3233 case TRUNCATE_FILE:
3234 case WRITE_FILE: {
3235 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
3236 ssize_t l;
3237
3238 l = cunescape(i->argument, 0, &unescaped);
3239 if (l < 0)
3240 return log_error_errno(l, "Failed to unescape parameter to write: %s", i->argument);
3241
3242 r = specifier_printf(unescaped, PATH_MAX-1, specifier_table, arg_root, NULL, &resolved);
3243 if (r < 0)
3244 return r;
3245
3246 return free_and_replace(i->argument, resolved);
3247 }
3248 case SET_XATTR:
3249 case RECURSIVE_SET_XATTR:
3250 STRV_FOREACH(xattr, i->xattrs) {
3251 _cleanup_free_ char *resolved = NULL;
3252
3253 r = specifier_printf(*xattr, SIZE_MAX, specifier_table, arg_root, NULL, &resolved);
3254 if (r < 0)
3255 return r;
3256
3257 free_and_replace(*xattr, resolved);
3258 }
3259 return 0;
3260
3261 default:
3262 return 0;
3263 }
3264 }
3265
3266 static int patch_var_run(const char *fname, unsigned line, char **path) {
3267 const char *k;
3268 char *n;
3269
3270 assert(path);
3271 assert(*path);
3272
3273 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
3274 * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
3275 * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
3276 * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
3277 * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
3278 * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
3279 * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
3280 * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
3281 * the latter. Moreover files below this path are by far the primary use case for tmpfiles.d/. */
3282
3283 k = path_startswith(*path, "/var/run/");
3284 if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
3285 return 0;
3286
3287 n = path_join("/run", k);
3288 if (!n)
3289 return log_oom();
3290
3291 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
3292 * there's no immediate need for action by the user. However, in the interest of making things less confusing
3293 * to the user, let's still inform the user that these snippets should really be updated. */
3294 log_syntax(NULL, LOG_NOTICE, fname, line, 0,
3295 "Line references path below legacy directory /var/run/, updating %s → %s; please update the tmpfiles.d/ drop-in file accordingly.",
3296 *path, n);
3297
3298 free_and_replace(*path, n);
3299
3300 return 0;
3301 }
3302
3303 static int find_uid(const char *user, uid_t *ret_uid, Hashmap **cache) {
3304 int r;
3305
3306 assert(user);
3307 assert(ret_uid);
3308
3309 /* First: parse as numeric UID string */
3310 r = parse_uid(user, ret_uid);
3311 if (r >= 0)
3312 return r;
3313
3314 /* Second: pass to NSS if we are running "online" */
3315 if (!arg_root)
3316 return get_user_creds(&user, ret_uid, NULL, NULL, NULL, 0);
3317
3318 /* Third, synthesize "root" unconditionally */
3319 if (streq(user, "root")) {
3320 *ret_uid = 0;
3321 return 0;
3322 }
3323
3324 /* Fourth: use fgetpwent() to read /etc/passwd directly, if we are "offline" */
3325 return name_to_uid_offline(arg_root, user, ret_uid, cache);
3326 }
3327
3328 static int find_gid(const char *group, gid_t *ret_gid, Hashmap **cache) {
3329 int r;
3330
3331 assert(group);
3332 assert(ret_gid);
3333
3334 /* First: parse as numeric GID string */
3335 r = parse_gid(group, ret_gid);
3336 if (r >= 0)
3337 return r;
3338
3339 /* Second: pass to NSS if we are running "online" */
3340 if (!arg_root)
3341 return get_group_creds(&group, ret_gid, 0);
3342
3343 /* Third, synthesize "root" unconditionally */
3344 if (streq(group, "root")) {
3345 *ret_gid = 0;
3346 return 0;
3347 }
3348
3349 /* Fourth: use fgetgrent() to read /etc/group directly, if we are "offline" */
3350 return name_to_gid_offline(arg_root, group, ret_gid, cache);
3351 }
3352
3353 static int parse_age_by_from_arg(const char *age_by_str, Item *item) {
3354 AgeBy ab_f = 0, ab_d = 0;
3355
3356 static const struct {
3357 char age_by_chr;
3358 AgeBy age_by_flag;
3359 } age_by_types[] = {
3360 { 'a', AGE_BY_ATIME },
3361 { 'b', AGE_BY_BTIME },
3362 { 'c', AGE_BY_CTIME },
3363 { 'm', AGE_BY_MTIME },
3364 };
3365
3366 assert(age_by_str);
3367 assert(item);
3368
3369 if (isempty(age_by_str))
3370 return -EINVAL;
3371
3372 for (const char *s = age_by_str; *s != 0; s++) {
3373 size_t i;
3374
3375 /* Ignore whitespace. */
3376 if (strchr(WHITESPACE, *s))
3377 continue;
3378
3379 for (i = 0; i < ELEMENTSOF(age_by_types); i++) {
3380 /* Check lower-case for files, upper-case for directories. */
3381 if (*s == age_by_types[i].age_by_chr) {
3382 ab_f |= age_by_types[i].age_by_flag;
3383 break;
3384 } else if (*s == ascii_toupper(age_by_types[i].age_by_chr)) {
3385 ab_d |= age_by_types[i].age_by_flag;
3386 break;
3387 }
3388 }
3389
3390 /* Invalid character. */
3391 if (i >= ELEMENTSOF(age_by_types))
3392 return -EINVAL;
3393 }
3394
3395 /* No match. */
3396 if (ab_f == 0 && ab_d == 0)
3397 return -EINVAL;
3398
3399 item->age_by_file = ab_f > 0 ? ab_f : AGE_BY_DEFAULT_FILE;
3400 item->age_by_dir = ab_d > 0 ? ab_d : AGE_BY_DEFAULT_DIR;
3401
3402 return 0;
3403 }
3404
3405 static bool is_duplicated_item(ItemArray *existing, const Item *i) {
3406
3407 assert(existing);
3408 assert(i);
3409
3410 for (size_t n = 0; n < existing->n_items; n++) {
3411 const Item *e = existing->items + n;
3412
3413 if (item_compatible(e, i))
3414 continue;
3415
3416 /* Only multiple 'w+' lines for the same path are allowed. */
3417 if (e->type != WRITE_FILE || !e->append_or_force ||
3418 i->type != WRITE_FILE || !i->append_or_force)
3419 return true;
3420 }
3421
3422 return false;
3423 }
3424
3425 static int parse_line(
3426 Context *c,
3427 const char *fname,
3428 unsigned line,
3429 const char *buffer,
3430 bool *invalid_config,
3431 Hashmap **uid_cache,
3432 Hashmap **gid_cache) {
3433
3434 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
3435 _cleanup_(item_free_contents) Item i = {
3436 /* The "age-by" argument considers all file timestamp types by default. */
3437 .age_by_file = AGE_BY_DEFAULT_FILE,
3438 .age_by_dir = AGE_BY_DEFAULT_DIR,
3439 };
3440 ItemArray *existing;
3441 OrderedHashmap *h;
3442 int r, pos;
3443 bool append_or_force = false, boot = false, allow_failure = false, try_replace = false,
3444 unbase64 = false, from_cred = false, missing_user_or_group = false;
3445
3446 assert(c);
3447 assert(fname);
3448 assert(line >= 1);
3449 assert(buffer);
3450
3451 const Specifier specifier_table[] = {
3452 { 'a', specifier_architecture, NULL },
3453 { 'b', specifier_boot_id, NULL },
3454 { 'B', specifier_os_build_id, NULL },
3455 { 'H', specifier_hostname, NULL },
3456 { 'l', specifier_short_hostname, NULL },
3457 { 'm', specifier_machine_id, NULL },
3458 { 'o', specifier_os_id, NULL },
3459 { 'v', specifier_kernel_release, NULL },
3460 { 'w', specifier_os_version_id, NULL },
3461 { 'W', specifier_os_variant_id, NULL },
3462
3463 { 'h', specifier_user_home, NULL },
3464
3465 { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
3466 { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
3467 { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
3468 { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
3469
3470 COMMON_CREDS_SPECIFIERS(arg_runtime_scope),
3471 COMMON_TMP_SPECIFIERS,
3472 {}
3473 };
3474
3475 r = extract_many_words(
3476 &buffer,
3477 NULL,
3478 EXTRACT_UNQUOTE | EXTRACT_CUNESCAPE,
3479 &action,
3480 &path,
3481 &mode,
3482 &user,
3483 &group,
3484 &age,
3485 NULL);
3486 if (r < 0) {
3487 if (IN_SET(r, -EINVAL, -EBADSLT))
3488 /* invalid quoting and such or an unknown specifier */
3489 *invalid_config = true;
3490 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to parse line: %m");
3491 } else if (r < 2) {
3492 *invalid_config = true;
3493 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Syntax error.");
3494 }
3495
3496 if (!empty_or_dash(buffer)) {
3497 i.argument = strdup(buffer);
3498 if (!i.argument)
3499 return log_oom();
3500 }
3501
3502 if (isempty(action)) {
3503 *invalid_config = true;
3504 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Command too short '%s'.", action);
3505 }
3506
3507 for (pos = 1; action[pos]; pos++) {
3508 if (action[pos] == '!' && !boot)
3509 boot = true;
3510 else if (action[pos] == '+' && !append_or_force)
3511 append_or_force = true;
3512 else if (action[pos] == '-' && !allow_failure)
3513 allow_failure = true;
3514 else if (action[pos] == '=' && !try_replace)
3515 try_replace = true;
3516 else if (action[pos] == '~' && !unbase64)
3517 unbase64 = true;
3518 else if (action[pos] == '^' && !from_cred)
3519 from_cred = true;
3520 else {
3521 *invalid_config = true;
3522 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Unknown modifiers in command '%s'", action);
3523 }
3524 }
3525
3526 if (boot && !arg_boot) {
3527 log_syntax(NULL, LOG_DEBUG, fname, line, 0, "Ignoring entry %s \"%s\" because --boot is not specified.", action, path);
3528 return 0;
3529 }
3530
3531 i.type = action[0];
3532 i.append_or_force = append_or_force;
3533 i.allow_failure = allow_failure;
3534 i.try_replace = try_replace;
3535
3536 r = specifier_printf(path, PATH_MAX-1, specifier_table, arg_root, NULL, &i.path);
3537 if (ERRNO_IS_NOINFO(r))
3538 return log_unresolvable_specifier(fname, line);
3539 if (r < 0) {
3540 if (IN_SET(r, -EINVAL, -EBADSLT))
3541 *invalid_config = true;
3542 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to replace specifiers in '%s': %m", path);
3543 }
3544
3545 r = patch_var_run(fname, line, &i.path);
3546 if (r < 0)
3547 return r;
3548
3549 if (!path_is_absolute(i.path)) {
3550 *invalid_config = true;
3551 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3552 "Path '%s' not absolute.", i.path);
3553 }
3554
3555 path_simplify(i.path);
3556
3557 switch (i.type) {
3558
3559 case CREATE_DIRECTORY:
3560 case CREATE_SUBVOLUME:
3561 case CREATE_SUBVOLUME_INHERIT_QUOTA:
3562 case CREATE_SUBVOLUME_NEW_QUOTA:
3563 case EMPTY_DIRECTORY:
3564 case TRUNCATE_DIRECTORY:
3565 case CREATE_FIFO:
3566 case IGNORE_PATH:
3567 case IGNORE_DIRECTORY_PATH:
3568 case REMOVE_PATH:
3569 case RECURSIVE_REMOVE_PATH:
3570 case ADJUST_MODE:
3571 case RELABEL_PATH:
3572 case RECURSIVE_RELABEL_PATH:
3573 if (i.argument)
3574 log_syntax(NULL,
3575 LOG_WARNING,
3576 fname,
3577 line,
3578 0,
3579 "%c lines don't take argument fields, ignoring.",
3580 (char) i.type);
3581
3582 break;
3583
3584 case CREATE_FILE:
3585 case TRUNCATE_FILE:
3586 break;
3587
3588 case CREATE_SYMLINK:
3589 if (unbase64) {
3590 *invalid_config = true;
3591 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for symlink targets.");
3592 }
3593 break;
3594
3595 case WRITE_FILE:
3596 if (!i.argument) {
3597 *invalid_config = true;
3598 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Write file requires argument.");
3599 }
3600 break;
3601
3602 case COPY_FILES:
3603 if (unbase64) {
3604 *invalid_config = true;
3605 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for copy sources.");
3606 }
3607 break;
3608
3609 case CREATE_CHAR_DEVICE:
3610 case CREATE_BLOCK_DEVICE:
3611 if (unbase64) {
3612 *invalid_config = true;
3613 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for device node creation.");
3614 }
3615
3616 if (!i.argument) {
3617 *invalid_config = true;
3618 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Device file requires argument.");
3619 }
3620
3621 r = parse_devnum(i.argument, &i.major_minor);
3622 if (r < 0) {
3623 *invalid_config = true;
3624 return log_syntax(NULL, LOG_ERR, fname, line, r, "Can't parse device file major/minor '%s'.", i.argument);
3625 }
3626
3627 break;
3628
3629 case SET_XATTR:
3630 case RECURSIVE_SET_XATTR:
3631 if (unbase64) {
3632 *invalid_config = true;
3633 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for extended attributes.");
3634 }
3635 if (!i.argument) {
3636 *invalid_config = true;
3637 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3638 "Set extended attribute requires argument.");
3639 }
3640 r = parse_xattrs_from_arg(&i);
3641 if (r < 0)
3642 return r;
3643 break;
3644
3645 case SET_ACL:
3646 case RECURSIVE_SET_ACL:
3647 if (unbase64) {
3648 *invalid_config = true;
3649 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for ACLs.");
3650 }
3651 if (!i.argument) {
3652 *invalid_config = true;
3653 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3654 "Set ACLs requires argument.");
3655 }
3656 r = parse_acls_from_arg(&i);
3657 if (r < 0)
3658 return r;
3659 break;
3660
3661 case SET_ATTRIBUTE:
3662 case RECURSIVE_SET_ATTRIBUTE:
3663 if (unbase64) {
3664 *invalid_config = true;
3665 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for file attributes.");
3666 }
3667 if (!i.argument) {
3668 *invalid_config = true;
3669 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3670 "Set file attribute requires argument.");
3671 }
3672 r = parse_attribute_from_arg(&i);
3673 if (IN_SET(r, -EINVAL, -EBADSLT))
3674 *invalid_config = true;
3675 if (r < 0)
3676 return r;
3677 break;
3678
3679 default:
3680 *invalid_config = true;
3681 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3682 "Unknown command type '%c'.", (char) i.type);
3683 }
3684
3685 if (!should_include_path(i.path))
3686 return 0;
3687
3688 if (!unbase64) {
3689 /* Do specifier expansion except if base64 mode is enabled */
3690 r = specifier_expansion_from_arg(specifier_table, &i);
3691 if (ERRNO_IS_NOINFO(r))
3692 return log_unresolvable_specifier(fname, line);
3693 if (r < 0) {
3694 if (IN_SET(r, -EINVAL, -EBADSLT))
3695 *invalid_config = true;
3696 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to substitute specifiers in argument: %m");
3697 }
3698 }
3699
3700 switch (i.type) {
3701 case CREATE_SYMLINK:
3702 if (!i.argument) {
3703 i.argument = path_join("/usr/share/factory", i.path);
3704 if (!i.argument)
3705 return log_oom();
3706 }
3707 break;
3708
3709 case COPY_FILES:
3710 if (!i.argument) {
3711 i.argument = path_join("/usr/share/factory", i.path);
3712 if (!i.argument)
3713 return log_oom();
3714 } else if (!path_is_absolute(i.argument)) {
3715 *invalid_config = true;
3716 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Source path '%s' is not absolute.", i.argument);
3717
3718 }
3719
3720 if (!empty_or_root(arg_root)) {
3721 char *p;
3722
3723 p = path_join(arg_root, i.argument);
3724 if (!p)
3725 return log_oom();
3726 free_and_replace(i.argument, p);
3727 }
3728
3729 path_simplify(i.argument);
3730
3731 if (laccess(i.argument, F_OK) == -ENOENT) {
3732 /* Silently skip over lines where the source file is missing. */
3733 log_syntax(NULL, LOG_DEBUG, fname, line, 0, "Copy source path '%s' does not exist, skipping line.", i.argument);
3734 return 0;
3735 }
3736
3737 break;
3738
3739 default:
3740 break;
3741 }
3742
3743 if (from_cred) {
3744 if (!i.argument)
3745 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EINVAL), "Reading from credential requested, but no credential name specified.");
3746 if (!credential_name_valid(i.argument))
3747 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EINVAL), "Credential name not valid: %s", i.argument);
3748
3749 r = read_credential(i.argument, &i.binary_argument, &i.binary_argument_size);
3750 if (IN_SET(r, -ENXIO, -ENOENT)) {
3751 /* Silently skip over lines that have no credentials passed */
3752 log_syntax(NULL, LOG_DEBUG, fname, line, 0,
3753 "Credential '%s' not specified, skipping line.", i.argument);
3754 return 0;
3755 }
3756 if (r < 0)
3757 return log_error_errno(r, "Failed to read credential '%s': %m", i.argument);
3758 }
3759
3760 /* If base64 decoding is requested, do so now */
3761 if (unbase64 && item_binary_argument(&i)) {
3762 _cleanup_free_ void *data = NULL;
3763 size_t data_size = 0;
3764
3765 r = unbase64mem(item_binary_argument(&i), item_binary_argument_size(&i), &data, &data_size);
3766 if (r < 0)
3767 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to base64 decode specified argument '%s': %m", i.argument);
3768
3769 free_and_replace(i.binary_argument, data);
3770 i.binary_argument_size = data_size;
3771 }
3772
3773 if (!empty_or_root(arg_root)) {
3774 char *p;
3775
3776 p = path_join(arg_root, i.path);
3777 if (!p)
3778 return log_oom();
3779 free_and_replace(i.path, p);
3780 }
3781
3782 if (!empty_or_dash(user)) {
3783 const char *u;
3784
3785 u = startswith(user, ":");
3786 if (u)
3787 i.uid_only_create = true;
3788 else
3789 u = user;
3790
3791 r = find_uid(u, &i.uid, uid_cache);
3792 if (r == -ESRCH && arg_graceful) {
3793 log_syntax(NULL, LOG_DEBUG, fname, line, r,
3794 "%s: user '%s' not found, not adjusting ownership.", i.path, u);
3795 missing_user_or_group = true;
3796 } else if (r < 0) {
3797 *invalid_config = true;
3798 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve user '%s': %m", u);
3799 } else
3800 i.uid_set = true;
3801 }
3802
3803 if (!empty_or_dash(group)) {
3804 const char *g;
3805
3806 g = startswith(group, ":");
3807 if (g)
3808 i.gid_only_create = true;
3809 else
3810 g = group;
3811
3812 r = find_gid(g, &i.gid, gid_cache);
3813 if (r == -ESRCH && arg_graceful) {
3814 log_syntax(NULL, LOG_DEBUG, fname, line, r,
3815 "%s: group '%s' not found, not adjusting ownership.", i.path, g);
3816 missing_user_or_group = true;
3817 } else if (r < 0) {
3818 *invalid_config = true;
3819 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve group '%s': %m", g);
3820 } else
3821 i.gid_set = true;
3822 }
3823
3824 if (!empty_or_dash(mode)) {
3825 const char *mm;
3826 unsigned m;
3827
3828 for (mm = mode;; mm++) {
3829 if (*mm == '~')
3830 i.mask_perms = true;
3831 else if (*mm == ':')
3832 i.mode_only_create = true;
3833 else
3834 break;
3835 }
3836
3837 r = parse_mode(mm, &m);
3838 if (r < 0) {
3839 *invalid_config = true;
3840 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid mode '%s'.", mode);
3841 }
3842
3843 i.mode = m;
3844 i.mode_set = true;
3845 } else
3846 i.mode = IN_SET(i.type,
3847 CREATE_DIRECTORY,
3848 TRUNCATE_DIRECTORY,
3849 CREATE_SUBVOLUME,
3850 CREATE_SUBVOLUME_INHERIT_QUOTA,
3851 CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
3852
3853 if (missing_user_or_group && (i.mode & ~0777) != 0) {
3854 /* Refuse any special bits for nodes where we couldn't resolve the ownership properly. */
3855 mode_t adjusted = i.mode & 0777;
3856 log_syntax(NULL, LOG_INFO, fname, line, 0,
3857 "Changing mode 0%o to 0%o because of changed ownership.", i.mode, adjusted);
3858 i.mode = adjusted;
3859 }
3860
3861 if (!empty_or_dash(age)) {
3862 const char *a = age;
3863 _cleanup_free_ char *seconds = NULL, *age_by = NULL;
3864
3865 if (*a == '~') {
3866 i.keep_first_level = true;
3867 a++;
3868 }
3869
3870 /* Format: "age-by:age"; where age-by is "[abcmABCM]+". */
3871 r = split_pair(a, ":", &age_by, &seconds);
3872 if (r == -ENOMEM)
3873 return log_oom();
3874 if (r < 0 && r != -EINVAL)
3875 return log_error_errno(r, "Failed to parse age-by for '%s': %m", age);
3876 if (r >= 0) {
3877 /* We found a ":", parse the "age-by" part. */
3878 r = parse_age_by_from_arg(age_by, &i);
3879 if (r == -ENOMEM)
3880 return log_oom();
3881 if (r < 0) {
3882 *invalid_config = true;
3883 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age-by '%s'.", age_by);
3884 }
3885
3886 /* For parsing the "age" part, after the ":". */
3887 a = seconds;
3888 }
3889
3890 r = parse_sec(a, &i.age);
3891 if (r < 0) {
3892 *invalid_config = true;
3893 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age '%s'.", a);
3894 }
3895
3896 i.age_set = true;
3897 }
3898
3899 h = needs_glob(i.type) ? c->globs : c->items;
3900
3901 existing = ordered_hashmap_get(h, i.path);
3902 if (existing) {
3903 if (is_duplicated_item(existing, &i)) {
3904 log_syntax(NULL, LOG_NOTICE, fname, line, 0,
3905 "Duplicate line for path \"%s\", ignoring.", i.path);
3906 return 0;
3907 }
3908 } else {
3909 existing = new0(ItemArray, 1);
3910 if (!existing)
3911 return log_oom();
3912
3913 r = ordered_hashmap_put(h, i.path, existing);
3914 if (r < 0) {
3915 free(existing);
3916 return log_oom();
3917 }
3918 }
3919
3920 if (!GREEDY_REALLOC(existing->items, existing->n_items + 1))
3921 return log_oom();
3922
3923 existing->items[existing->n_items++] = TAKE_STRUCT(i);
3924
3925 /* Sort item array, to enforce stable ordering of application */
3926 typesafe_qsort(existing->items, existing->n_items, item_compare);
3927
3928 return 0;
3929 }
3930
3931 static int cat_config(char **config_dirs, char **args) {
3932 _cleanup_strv_free_ char **files = NULL;
3933 int r;
3934
3935 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
3936 if (r < 0)
3937 return r;
3938
3939 pager_open(arg_pager_flags);
3940
3941 return cat_files(NULL, files, arg_cat_flags);
3942 }
3943
3944 static int exclude_default_prefixes(void) {
3945 int r;
3946
3947 /* Provide an easy way to exclude virtual/memory file systems from what we do here. Useful in
3948 * combination with --root= where we probably don't want to apply stuff to these dirs as they are
3949 * likely over-mounted if the root directory is actually used, and it wouldbe less than ideal to have
3950 * all kinds of files created/adjusted underneath these mount points. */
3951
3952 r = strv_extend_strv(
3953 &arg_exclude_prefixes,
3954 STRV_MAKE("/dev",
3955 "/proc",
3956 "/run",
3957 "/sys"),
3958 true);
3959 if (r < 0)
3960 return log_oom();
3961
3962 return 0;
3963 }
3964
3965 static int help(void) {
3966 _cleanup_free_ char *link = NULL;
3967 int r;
3968
3969 r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
3970 if (r < 0)
3971 return log_oom();
3972
3973 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n"
3974 "\n%sCreates, deletes and cleans up volatile and temporary files and directories.%s\n\n"
3975 " -h --help Show this help\n"
3976 " --user Execute user configuration\n"
3977 " --version Show package version\n"
3978 " --cat-config Show configuration files\n"
3979 " --tldr Show non-comment parts of configuration\n"
3980 " --create Create marked files/directories\n"
3981 " --clean Clean up marked directories\n"
3982 " --remove Remove marked files/directories\n"
3983 " --boot Execute actions only safe at boot\n"
3984 " --graceful Quietly ignore unknown users or groups\n"
3985 " --prefix=PATH Only apply rules with the specified prefix\n"
3986 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
3987 " -E Ignore rules prefixed with /dev, /proc, /run, /sys\n"
3988 " --root=PATH Operate on an alternate filesystem root\n"
3989 " --image=PATH Operate on disk image as filesystem root\n"
3990 " --image-policy=POLICY Specify disk image dissection policy\n"
3991 " --replace=PATH Treat arguments as replacement for PATH\n"
3992 " --no-pager Do not pipe output into a pager\n"
3993 "\nSee the %s for details.\n",
3994 program_invocation_short_name,
3995 ansi_highlight(),
3996 ansi_normal(),
3997 link);
3998
3999 return 0;
4000 }
4001
4002 static int parse_argv(int argc, char *argv[]) {
4003
4004 enum {
4005 ARG_VERSION = 0x100,
4006 ARG_CAT_CONFIG,
4007 ARG_TLDR,
4008 ARG_USER,
4009 ARG_CREATE,
4010 ARG_CLEAN,
4011 ARG_REMOVE,
4012 ARG_BOOT,
4013 ARG_GRACEFUL,
4014 ARG_PREFIX,
4015 ARG_EXCLUDE_PREFIX,
4016 ARG_ROOT,
4017 ARG_IMAGE,
4018 ARG_IMAGE_POLICY,
4019 ARG_REPLACE,
4020 ARG_NO_PAGER,
4021 };
4022
4023 static const struct option options[] = {
4024 { "help", no_argument, NULL, 'h' },
4025 { "user", no_argument, NULL, ARG_USER },
4026 { "version", no_argument, NULL, ARG_VERSION },
4027 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
4028 { "tldr", no_argument, NULL, ARG_TLDR },
4029 { "create", no_argument, NULL, ARG_CREATE },
4030 { "clean", no_argument, NULL, ARG_CLEAN },
4031 { "remove", no_argument, NULL, ARG_REMOVE },
4032 { "boot", no_argument, NULL, ARG_BOOT },
4033 { "graceful", no_argument, NULL, ARG_GRACEFUL },
4034 { "prefix", required_argument, NULL, ARG_PREFIX },
4035 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
4036 { "root", required_argument, NULL, ARG_ROOT },
4037 { "image", required_argument, NULL, ARG_IMAGE },
4038 { "image-policy", required_argument, NULL, ARG_IMAGE_POLICY },
4039 { "replace", required_argument, NULL, ARG_REPLACE },
4040 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
4041 {}
4042 };
4043
4044 int c, r;
4045
4046 assert(argc >= 0);
4047 assert(argv);
4048
4049 while ((c = getopt_long(argc, argv, "hE", options, NULL)) >= 0)
4050
4051 switch (c) {
4052
4053 case 'h':
4054 return help();
4055
4056 case ARG_VERSION:
4057 return version();
4058
4059 case ARG_CAT_CONFIG:
4060 arg_cat_flags = CAT_CONFIG_ON;
4061 break;
4062
4063 case ARG_TLDR:
4064 arg_cat_flags = CAT_TLDR;
4065 break;
4066
4067 case ARG_USER:
4068 arg_runtime_scope = RUNTIME_SCOPE_USER;
4069 break;
4070
4071 case ARG_CREATE:
4072 arg_operation |= OPERATION_CREATE;
4073 break;
4074
4075 case ARG_CLEAN:
4076 arg_operation |= OPERATION_CLEAN;
4077 break;
4078
4079 case ARG_REMOVE:
4080 arg_operation |= OPERATION_REMOVE;
4081 break;
4082
4083 case ARG_BOOT:
4084 arg_boot = true;
4085 break;
4086
4087 case ARG_GRACEFUL:
4088 arg_graceful = true;
4089 break;
4090
4091 case ARG_PREFIX:
4092 if (strv_push(&arg_include_prefixes, optarg) < 0)
4093 return log_oom();
4094 break;
4095
4096 case ARG_EXCLUDE_PREFIX:
4097 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
4098 return log_oom();
4099 break;
4100
4101 case ARG_ROOT:
4102 r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_root);
4103 if (r < 0)
4104 return r;
4105 break;
4106
4107 case ARG_IMAGE:
4108 #ifdef STANDALONE
4109 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
4110 "This systemd-tmpfiles version is compiled without support for --image=.");
4111 #else
4112 r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_image);
4113 if (r < 0)
4114 return r;
4115 #endif
4116 /* Imply -E here since it makes little sense to create files persistently in the /run mountpoint of a disk image */
4117 _fallthrough_;
4118
4119 case 'E':
4120 r = exclude_default_prefixes();
4121 if (r < 0)
4122 return r;
4123
4124 break;
4125
4126 case ARG_IMAGE_POLICY:
4127 r = parse_image_policy_argument(optarg, &arg_image_policy);
4128 if (r < 0)
4129 return r;
4130 break;
4131
4132 case ARG_REPLACE:
4133 if (!path_is_absolute(optarg) ||
4134 !endswith(optarg, ".conf"))
4135 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
4136 "The argument to --replace= must an absolute path to a config file");
4137
4138 arg_replace = optarg;
4139 break;
4140
4141 case ARG_NO_PAGER:
4142 arg_pager_flags |= PAGER_DISABLE;
4143 break;
4144
4145 case '?':
4146 return -EINVAL;
4147
4148 default:
4149 assert_not_reached();
4150 }
4151
4152 if (arg_operation == 0 && arg_cat_flags == CAT_CONFIG_OFF)
4153 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
4154 "You need to specify at least one of --clean, --create, or --remove.");
4155
4156 if (arg_replace && arg_cat_flags != CAT_CONFIG_OFF)
4157 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
4158 "Option --replace= is not supported with --cat-config/--tldr.");
4159
4160 if (arg_replace && optind >= argc)
4161 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
4162 "When --replace= is given, some configuration items must be specified.");
4163
4164 if (arg_root && arg_runtime_scope == RUNTIME_SCOPE_USER)
4165 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
4166 "Combination of --user and --root= is not supported.");
4167
4168 if (arg_image && arg_root)
4169 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Please specify either --root= or --image=, the combination of both is not supported.");
4170
4171 return 1;
4172 }
4173
4174 static int read_config_file(
4175 Context *c,
4176 char **config_dirs,
4177 const char *fn,
4178 bool ignore_enoent,
4179 bool *invalid_config) {
4180
4181 _cleanup_hashmap_free_ Hashmap *uid_cache = NULL, *gid_cache = NULL;
4182 _cleanup_fclose_ FILE *_f = NULL;
4183 _cleanup_free_ char *pp = NULL;
4184 unsigned v = 0;
4185 FILE *f;
4186 ItemArray *ia;
4187 int r = 0;
4188
4189 assert(c);
4190 assert(fn);
4191
4192 if (streq(fn, "-")) {
4193 log_debug("Reading config from stdin%s", special_glyph(SPECIAL_GLYPH_ELLIPSIS));
4194 fn = "<stdin>";
4195 f = stdin;
4196 } else {
4197 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f, &pp);
4198 if (r < 0) {
4199 if (ignore_enoent && r == -ENOENT) {
4200 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
4201 return 0;
4202 }
4203
4204 return log_error_errno(r, "Failed to open '%s': %m", fn);
4205 }
4206
4207 log_debug("Reading config file \"%s\"%s", pp, special_glyph(SPECIAL_GLYPH_ELLIPSIS));
4208 fn = pp;
4209 f = _f;
4210 }
4211
4212 for (;;) {
4213 _cleanup_free_ char *line = NULL;
4214 bool invalid_line = false;
4215 int k;
4216
4217 k = read_stripped_line(f, LONG_LINE_MAX, &line);
4218 if (k < 0)
4219 return log_error_errno(k, "Failed to read '%s': %m", fn);
4220 if (k == 0)
4221 break;
4222
4223 v++;
4224
4225 if (IN_SET(line[0], 0, '#'))
4226 continue;
4227
4228 k = parse_line(c, fn, v, line, &invalid_line, &uid_cache, &gid_cache);
4229 if (k < 0) {
4230 if (invalid_line)
4231 /* Allow reporting with a special code if the caller requested this */
4232 *invalid_config = true;
4233 else if (r == 0)
4234 /* The first error becomes our return value */
4235 r = k;
4236 }
4237 }
4238
4239 /* we have to determine age parameter for each entry of type X */
4240 ORDERED_HASHMAP_FOREACH(ia, c->globs)
4241 for (size_t ni = 0; ni < ia->n_items; ni++) {
4242 ItemArray *ja;
4243 Item *i = ia->items + ni, *candidate_item = NULL;
4244
4245 if (i->type != IGNORE_DIRECTORY_PATH)
4246 continue;
4247
4248 ORDERED_HASHMAP_FOREACH(ja, c->items)
4249 for (size_t nj = 0; nj < ja->n_items; nj++) {
4250 Item *j = ja->items + nj;
4251
4252 if (!IN_SET(j->type, CREATE_DIRECTORY,
4253 TRUNCATE_DIRECTORY,
4254 CREATE_SUBVOLUME,
4255 CREATE_SUBVOLUME_INHERIT_QUOTA,
4256 CREATE_SUBVOLUME_NEW_QUOTA))
4257 continue;
4258
4259 if (path_equal(j->path, i->path)) {
4260 candidate_item = j;
4261 break;
4262 }
4263
4264 if (candidate_item
4265 ? (path_startswith(j->path, candidate_item->path) && fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)
4266 : path_startswith(i->path, j->path) != NULL)
4267 candidate_item = j;
4268 }
4269
4270 if (candidate_item && candidate_item->age_set) {
4271 i->age = candidate_item->age;
4272 i->age_set = true;
4273 }
4274 }
4275
4276 if (ferror(f)) {
4277 log_error_errno(errno, "Failed to read from file %s: %m", fn);
4278 if (r == 0)
4279 r = -EIO;
4280 }
4281
4282 return r;
4283 }
4284
4285 static int parse_arguments(
4286 Context *c,
4287 char **config_dirs,
4288 char **args,
4289 bool *invalid_config) {
4290 int r;
4291
4292 assert(c);
4293
4294 STRV_FOREACH(arg, args) {
4295 r = read_config_file(c, config_dirs, *arg, false, invalid_config);
4296 if (r < 0)
4297 return r;
4298 }
4299
4300 return 0;
4301 }
4302
4303 static int read_config_files(
4304 Context *c,
4305 char **config_dirs,
4306 char **args,
4307 bool *invalid_config) {
4308
4309 _cleanup_strv_free_ char **files = NULL;
4310 _cleanup_free_ char *p = NULL;
4311 int r;
4312
4313 assert(c);
4314
4315 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
4316 if (r < 0)
4317 return r;
4318
4319 STRV_FOREACH(f, files)
4320 if (p && path_equal(*f, p)) {
4321 log_debug("Parsing arguments at position \"%s\"%s", *f, special_glyph(SPECIAL_GLYPH_ELLIPSIS));
4322
4323 r = parse_arguments(c, config_dirs, args, invalid_config);
4324 if (r < 0)
4325 return r;
4326 } else
4327 /* Just warn, ignore result otherwise.
4328 * read_config_file() has some debug output, so no need to print anything. */
4329 (void) read_config_file(c, config_dirs, *f, true, invalid_config);
4330
4331 return 0;
4332 }
4333
4334 static int read_credential_lines(Context *c, bool *invalid_config) {
4335
4336 _cleanup_free_ char *j = NULL;
4337 const char *d;
4338 int r;
4339
4340 assert(c);
4341
4342 r = get_credentials_dir(&d);
4343 if (r == -ENXIO)
4344 return 0;
4345 if (r < 0)
4346 return log_error_errno(r, "Failed to get credentials directory: %m");
4347
4348 j = path_join(d, "tmpfiles.extra");
4349 if (!j)
4350 return log_oom();
4351
4352 (void) read_config_file(c, /* config_dirs= */ NULL, j, /* ignore_enoent= */ true, invalid_config);
4353 return 0;
4354 }
4355
4356 static int link_parent(Context *c, ItemArray *a) {
4357 const char *path;
4358 char *prefix;
4359 int r;
4360
4361 assert(c);
4362 assert(a);
4363
4364 /* Finds the closest "parent" item array for the specified item array. Then registers the specified item array
4365 * as child of it, and fills the parent in, linking them both ways. This allows us to later create parents
4366 * before their children, and clean up/remove children before their parents. */
4367
4368 if (a->n_items <= 0)
4369 return 0;
4370
4371 path = a->items[0].path;
4372 prefix = newa(char, strlen(path) + 1);
4373 PATH_FOREACH_PREFIX(prefix, path) {
4374 ItemArray *j;
4375
4376 j = ordered_hashmap_get(c->items, prefix);
4377 if (!j)
4378 j = ordered_hashmap_get(c->globs, prefix);
4379 if (j) {
4380 r = set_ensure_put(&j->children, NULL, a);
4381 if (r < 0)
4382 return log_oom();
4383
4384 a->parent = j;
4385 return 1;
4386 }
4387 }
4388
4389 return 0;
4390 }
4391
4392 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
4393 ItemArray, item_array_free);
4394
4395 static int run(int argc, char *argv[]) {
4396 #ifndef STANDALONE
4397 _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL;
4398 _cleanup_(umount_and_freep) char *mounted_dir = NULL;
4399 #endif
4400 _cleanup_strv_free_ char **config_dirs = NULL;
4401 _cleanup_(context_done) Context c = {};
4402 bool invalid_config = false;
4403 ItemArray *a;
4404 enum {
4405 PHASE_REMOVE_AND_CLEAN,
4406 PHASE_CREATE,
4407 _PHASE_MAX
4408 } phase;
4409 int r, k;
4410
4411 r = parse_argv(argc, argv);
4412 if (r <= 0)
4413 return r;
4414
4415 log_setup();
4416
4417 /* We require /proc/ for a lot of our operations, i.e. for adjusting access modes, for anything
4418 * SELinux related, for recursive operation, for xattr, acl and chattr handling, for btrfs stuff and
4419 * a lot more. It's probably the majority of invocations where /proc/ is required. Since people
4420 * apparently invoke it without anyway and are surprised about the failures, let's catch this early
4421 * and output a nice and friendly warning. */
4422 if (proc_mounted() == 0)
4423 return log_error_errno(SYNTHETIC_ERRNO(ENOSYS),
4424 "/proc/ is not mounted, but required for successful operation of systemd-tmpfiles. "
4425 "Please mount /proc/. Alternatively, consider using the --root= or --image= switches.");
4426
4427 /* Descending down file system trees might take a lot of fds */
4428 (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
4429
4430 switch (arg_runtime_scope) {
4431
4432 case RUNTIME_SCOPE_USER:
4433 r = user_config_paths(&config_dirs);
4434 if (r < 0)
4435 return log_error_errno(r, "Failed to initialize configuration directory list: %m");
4436 break;
4437
4438 case RUNTIME_SCOPE_SYSTEM:
4439 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
4440 if (!config_dirs)
4441 return log_oom();
4442 break;
4443
4444 default:
4445 assert_not_reached();
4446 }
4447
4448 if (DEBUG_LOGGING) {
4449 _cleanup_free_ char *t = NULL;
4450
4451 STRV_FOREACH(i, config_dirs) {
4452 _cleanup_free_ char *j = NULL;
4453
4454 j = path_join(arg_root, *i);
4455 if (!j)
4456 return log_oom();
4457
4458 if (!strextend(&t, "\n\t", j))
4459 return log_oom();
4460 }
4461
4462 log_debug("Looking for configuration files in (higher priority first):%s", t);
4463 }
4464
4465 if (arg_cat_flags != CAT_CONFIG_OFF)
4466 return cat_config(config_dirs, argv + optind);
4467
4468 umask(0022);
4469
4470 r = mac_init();
4471 if (r < 0)
4472 return r;
4473
4474 #ifndef STANDALONE
4475 if (arg_image) {
4476 assert(!arg_root);
4477
4478 r = mount_image_privately_interactively(
4479 arg_image,
4480 arg_image_policy,
4481 DISSECT_IMAGE_GENERIC_ROOT |
4482 DISSECT_IMAGE_REQUIRE_ROOT |
4483 DISSECT_IMAGE_VALIDATE_OS |
4484 DISSECT_IMAGE_RELAX_VAR_CHECK |
4485 DISSECT_IMAGE_FSCK |
4486 DISSECT_IMAGE_GROWFS,
4487 &mounted_dir,
4488 /* ret_dir_fd= */ NULL,
4489 &loop_device);
4490 if (r < 0)
4491 return r;
4492
4493 arg_root = strdup(mounted_dir);
4494 if (!arg_root)
4495 return log_oom();
4496 }
4497 #else
4498 assert(!arg_image);
4499 #endif
4500
4501 c.items = ordered_hashmap_new(&item_array_hash_ops);
4502 c.globs = ordered_hashmap_new(&item_array_hash_ops);
4503 if (!c.items || !c.globs)
4504 return log_oom();
4505
4506 /* If command line arguments are specified along with --replace, read all
4507 * configuration files and insert the positional arguments at the specified
4508 * place. Otherwise, if command line arguments are specified, execute just
4509 * them, and finally, without --replace= or any positional arguments, just
4510 * read configuration and execute it.
4511 */
4512 if (arg_replace || optind >= argc)
4513 r = read_config_files(&c, config_dirs, argv + optind, &invalid_config);
4514 else
4515 r = parse_arguments(&c, config_dirs, argv + optind, &invalid_config);
4516 if (r < 0)
4517 return r;
4518
4519 r = read_credential_lines(&c, &invalid_config);
4520 if (r < 0)
4521 return r;
4522
4523 /* Let's now link up all child/parent relationships */
4524 ORDERED_HASHMAP_FOREACH(a, c.items) {
4525 r = link_parent(&c, a);
4526 if (r < 0)
4527 return r;
4528 }
4529 ORDERED_HASHMAP_FOREACH(a, c.globs) {
4530 r = link_parent(&c, a);
4531 if (r < 0)
4532 return r;
4533 }
4534
4535 /* If multiple operations are requested, let's first run the remove/clean operations, and only then the create
4536 * operations. i.e. that we first clean out the platform we then build on. */
4537 for (phase = 0; phase < _PHASE_MAX; phase++) {
4538 OperationMask op;
4539
4540 if (phase == PHASE_REMOVE_AND_CLEAN)
4541 op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
4542 else if (phase == PHASE_CREATE)
4543 op = arg_operation & OPERATION_CREATE;
4544 else
4545 assert_not_reached();
4546
4547 if (op == 0) /* Nothing requested in this phase */
4548 continue;
4549
4550 /* The non-globbing ones usually create things, hence we apply them first */
4551 ORDERED_HASHMAP_FOREACH(a, c.items) {
4552 k = process_item_array(&c, a, op);
4553 if (k < 0 && r >= 0)
4554 r = k;
4555 }
4556
4557 /* The globbing ones usually alter things, hence we apply them second. */
4558 ORDERED_HASHMAP_FOREACH(a, c.globs) {
4559 k = process_item_array(&c, a, op);
4560 if (k < 0 && r >= 0)
4561 r = k;
4562 }
4563 }
4564
4565 if (ERRNO_IS_RESOURCE(r))
4566 return r;
4567 if (invalid_config)
4568 return EX_DATAERR;
4569 if (r < 0)
4570 return EX_CANTCREAT;
4571 return 0;
4572 }
4573
4574 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
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