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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
f4f15635 | 2 | |
11c3a366 TA |
3 | #include <errno.h> |
4 | #include <stddef.h> | |
11c3a366 | 5 | #include <stdlib.h> |
1c73b069 | 6 | #include <linux/falloc.h> |
655f2da0 | 7 | #include <linux/magic.h> |
11c3a366 TA |
8 | #include <unistd.h> |
9 | ||
b5efdb8a | 10 | #include "alloc-util.h" |
ed9c0851 | 11 | #include "blockdev-util.h" |
f4f15635 LP |
12 | #include "dirent-util.h" |
13 | #include "fd-util.h" | |
ed9c0851 | 14 | #include "fileio.h" |
f4f15635 | 15 | #include "fs-util.h" |
fd74c6f3 | 16 | #include "locale-util.h" |
11c3a366 TA |
17 | #include "log.h" |
18 | #include "macro.h" | |
0499585f | 19 | #include "missing_fcntl.h" |
f5947a5e YW |
20 | #include "missing_fs.h" |
21 | #include "missing_syscall.h" | |
93cc7779 TA |
22 | #include "mkdir.h" |
23 | #include "parse-util.h" | |
24 | #include "path-util.h" | |
dccca82b | 25 | #include "process-util.h" |
053e0626 | 26 | #include "random-util.h" |
34a8f081 | 27 | #include "stat-util.h" |
430fbf8e | 28 | #include "stdio-util.h" |
f4f15635 LP |
29 | #include "string-util.h" |
30 | #include "strv.h" | |
93cc7779 | 31 | #include "time-util.h" |
e4de7287 | 32 | #include "tmpfile-util.h" |
ee104e11 | 33 | #include "user-util.h" |
f4f15635 LP |
34 | #include "util.h" |
35 | ||
36 | int unlink_noerrno(const char *path) { | |
37 | PROTECT_ERRNO; | |
38 | int r; | |
39 | ||
40 | r = unlink(path); | |
41 | if (r < 0) | |
42 | return -errno; | |
43 | ||
44 | return 0; | |
45 | } | |
46 | ||
47 | int rmdir_parents(const char *path, const char *stop) { | |
48 | size_t l; | |
49 | int r = 0; | |
50 | ||
51 | assert(path); | |
52 | assert(stop); | |
53 | ||
54 | l = strlen(path); | |
55 | ||
56 | /* Skip trailing slashes */ | |
57 | while (l > 0 && path[l-1] == '/') | |
58 | l--; | |
59 | ||
60 | while (l > 0) { | |
61 | char *t; | |
62 | ||
63 | /* Skip last component */ | |
64 | while (l > 0 && path[l-1] != '/') | |
65 | l--; | |
66 | ||
67 | /* Skip trailing slashes */ | |
68 | while (l > 0 && path[l-1] == '/') | |
69 | l--; | |
70 | ||
71 | if (l <= 0) | |
72 | break; | |
73 | ||
74 | t = strndup(path, l); | |
75 | if (!t) | |
76 | return -ENOMEM; | |
77 | ||
78 | if (path_startswith(stop, t)) { | |
79 | free(t); | |
80 | return 0; | |
81 | } | |
82 | ||
83 | r = rmdir(t); | |
84 | free(t); | |
85 | ||
86 | if (r < 0) | |
87 | if (errno != ENOENT) | |
88 | return -errno; | |
89 | } | |
90 | ||
91 | return 0; | |
92 | } | |
93 | ||
f4f15635 | 94 | int rename_noreplace(int olddirfd, const char *oldpath, int newdirfd, const char *newpath) { |
2f15b625 | 95 | int r; |
f4f15635 | 96 | |
2f15b625 LP |
97 | /* Try the ideal approach first */ |
98 | if (renameat2(olddirfd, oldpath, newdirfd, newpath, RENAME_NOREPLACE) >= 0) | |
f4f15635 LP |
99 | return 0; |
100 | ||
2f15b625 LP |
101 | /* renameat2() exists since Linux 3.15, btrfs and FAT added support for it later. If it is not implemented, |
102 | * fall back to a different method. */ | |
103 | if (!IN_SET(errno, EINVAL, ENOSYS, ENOTTY)) | |
f4f15635 LP |
104 | return -errno; |
105 | ||
2f15b625 LP |
106 | /* Let's try to use linkat()+unlinkat() as fallback. This doesn't work on directories and on some file systems |
107 | * that do not support hard links (such as FAT, most prominently), but for files it's pretty close to what we | |
108 | * want — though not atomic (i.e. for a short period both the new and the old filename will exist). */ | |
109 | if (linkat(olddirfd, oldpath, newdirfd, newpath, 0) >= 0) { | |
110 | ||
111 | if (unlinkat(olddirfd, oldpath, 0) < 0) { | |
112 | r = -errno; /* Backup errno before the following unlinkat() alters it */ | |
113 | (void) unlinkat(newdirfd, newpath, 0); | |
114 | return r; | |
115 | } | |
116 | ||
117 | return 0; | |
f4f15635 LP |
118 | } |
119 | ||
2f15b625 | 120 | if (!IN_SET(errno, EINVAL, ENOSYS, ENOTTY, EPERM)) /* FAT returns EPERM on link()… */ |
f4f15635 LP |
121 | return -errno; |
122 | ||
2aed63f4 | 123 | /* OK, neither RENAME_NOREPLACE nor linkat()+unlinkat() worked. Let's then fall back to the racy TOCTOU |
2f15b625 LP |
124 | * vulnerable accessat(F_OK) check followed by classic, replacing renameat(), we have nothing better. */ |
125 | ||
126 | if (faccessat(newdirfd, newpath, F_OK, AT_SYMLINK_NOFOLLOW) >= 0) | |
127 | return -EEXIST; | |
128 | if (errno != ENOENT) | |
129 | return -errno; | |
130 | ||
131 | if (renameat(olddirfd, oldpath, newdirfd, newpath) < 0) | |
f4f15635 | 132 | return -errno; |
f4f15635 LP |
133 | |
134 | return 0; | |
135 | } | |
136 | ||
137 | int readlinkat_malloc(int fd, const char *p, char **ret) { | |
8e060ec2 | 138 | size_t l = FILENAME_MAX+1; |
f4f15635 LP |
139 | int r; |
140 | ||
141 | assert(p); | |
142 | assert(ret); | |
143 | ||
144 | for (;;) { | |
145 | char *c; | |
146 | ssize_t n; | |
147 | ||
148 | c = new(char, l); | |
149 | if (!c) | |
150 | return -ENOMEM; | |
151 | ||
152 | n = readlinkat(fd, p, c, l-1); | |
153 | if (n < 0) { | |
154 | r = -errno; | |
155 | free(c); | |
156 | return r; | |
157 | } | |
158 | ||
159 | if ((size_t) n < l-1) { | |
160 | c[n] = 0; | |
161 | *ret = c; | |
162 | return 0; | |
163 | } | |
164 | ||
165 | free(c); | |
166 | l *= 2; | |
167 | } | |
168 | } | |
169 | ||
170 | int readlink_malloc(const char *p, char **ret) { | |
171 | return readlinkat_malloc(AT_FDCWD, p, ret); | |
172 | } | |
173 | ||
174 | int readlink_value(const char *p, char **ret) { | |
175 | _cleanup_free_ char *link = NULL; | |
176 | char *value; | |
177 | int r; | |
178 | ||
179 | r = readlink_malloc(p, &link); | |
180 | if (r < 0) | |
181 | return r; | |
182 | ||
183 | value = basename(link); | |
184 | if (!value) | |
185 | return -ENOENT; | |
186 | ||
187 | value = strdup(value); | |
188 | if (!value) | |
189 | return -ENOMEM; | |
190 | ||
191 | *ret = value; | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | int readlink_and_make_absolute(const char *p, char **r) { | |
197 | _cleanup_free_ char *target = NULL; | |
198 | char *k; | |
199 | int j; | |
200 | ||
201 | assert(p); | |
202 | assert(r); | |
203 | ||
204 | j = readlink_malloc(p, &target); | |
205 | if (j < 0) | |
206 | return j; | |
207 | ||
208 | k = file_in_same_dir(p, target); | |
209 | if (!k) | |
210 | return -ENOMEM; | |
211 | ||
212 | *r = k; | |
213 | return 0; | |
214 | } | |
215 | ||
f4f15635 | 216 | int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid) { |
de321f52 | 217 | _cleanup_close_ int fd = -1; |
30ff18d8 | 218 | |
f4f15635 LP |
219 | assert(path); |
220 | ||
30ff18d8 LP |
221 | fd = open(path, O_PATH|O_CLOEXEC|O_NOFOLLOW); /* Let's acquire an O_PATH fd, as precaution to change |
222 | * mode/owner on the same file */ | |
de321f52 LP |
223 | if (fd < 0) |
224 | return -errno; | |
225 | ||
2dbb7e94 | 226 | return fchmod_and_chown(fd, mode, uid, gid); |
b8da477e YW |
227 | } |
228 | ||
229 | int fchmod_and_chown(int fd, mode_t mode, uid_t uid, gid_t gid) { | |
2dbb7e94 | 230 | bool do_chown, do_chmod; |
30ff18d8 | 231 | struct stat st; |
dee00c19 | 232 | int r; |
30ff18d8 | 233 | |
2dbb7e94 LP |
234 | /* Change ownership and access mode of the specified fd. Tries to do so safely, ensuring that at no |
235 | * point in time the access mode is above the old access mode under the old ownership or the new | |
236 | * access mode under the new ownership. Note: this call tries hard to leave the access mode | |
237 | * unaffected if the uid/gid is changed, i.e. it undoes implicit suid/sgid dropping the kernel does | |
238 | * on chown(). | |
239 | * | |
71ec74d1 | 240 | * This call is happy with O_PATH fds. */ |
b8da477e | 241 | |
71ec74d1 | 242 | if (fstat(fd, &st) < 0) |
2dbb7e94 | 243 | return -errno; |
de321f52 | 244 | |
2dbb7e94 LP |
245 | do_chown = |
246 | (uid != UID_INVALID && st.st_uid != uid) || | |
247 | (gid != GID_INVALID && st.st_gid != gid); | |
de321f52 | 248 | |
2dbb7e94 LP |
249 | do_chmod = |
250 | !S_ISLNK(st.st_mode) && /* chmod is not defined on symlinks */ | |
251 | ((mode != MODE_INVALID && ((st.st_mode ^ mode) & 07777) != 0) || | |
252 | do_chown); /* If we change ownership, make sure we reset the mode afterwards, since chown() | |
253 | * modifies the access mode too */ | |
30ff18d8 | 254 | |
2dbb7e94 LP |
255 | if (mode == MODE_INVALID) |
256 | mode = st.st_mode; /* If we only shall do a chown(), save original mode, since chown() might break it. */ | |
257 | else if ((mode & S_IFMT) != 0 && ((mode ^ st.st_mode) & S_IFMT) != 0) | |
258 | return -EINVAL; /* insist on the right file type if it was specified */ | |
de321f52 | 259 | |
2dbb7e94 LP |
260 | if (do_chown && do_chmod) { |
261 | mode_t minimal = st.st_mode & mode; /* the subset of the old and the new mask */ | |
30ff18d8 | 262 | |
dee00c19 LP |
263 | if (((minimal ^ st.st_mode) & 07777) != 0) { |
264 | r = fchmod_opath(fd, minimal & 07777); | |
265 | if (r < 0) | |
266 | return r; | |
267 | } | |
de321f52 | 268 | } |
b8da477e | 269 | |
2dbb7e94 | 270 | if (do_chown) |
71ec74d1 | 271 | if (fchownat(fd, "", uid, gid, AT_EMPTY_PATH) < 0) |
2dbb7e94 | 272 | return -errno; |
30ff18d8 | 273 | |
dee00c19 LP |
274 | if (do_chmod) { |
275 | r = fchmod_opath(fd, mode & 07777); | |
276 | if (r < 0) | |
277 | return r; | |
278 | } | |
30ff18d8 | 279 | |
2dbb7e94 | 280 | return do_chown || do_chmod; |
f4f15635 LP |
281 | } |
282 | ||
f4f15635 LP |
283 | int fchmod_umask(int fd, mode_t m) { |
284 | mode_t u; | |
285 | int r; | |
286 | ||
287 | u = umask(0777); | |
288 | r = fchmod(fd, m & (~u)) < 0 ? -errno : 0; | |
289 | umask(u); | |
290 | ||
291 | return r; | |
292 | } | |
293 | ||
4dfaa528 | 294 | int fchmod_opath(int fd, mode_t m) { |
22dd8d35 | 295 | char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)]; |
4dfaa528 FB |
296 | |
297 | /* This function operates also on fd that might have been opened with | |
298 | * O_PATH. Indeed fchmodat() doesn't have the AT_EMPTY_PATH flag like | |
299 | * fchownat() does. */ | |
300 | ||
301 | xsprintf(procfs_path, "/proc/self/fd/%i", fd); | |
f8606626 LP |
302 | if (chmod(procfs_path, m) < 0) { |
303 | if (errno != ENOENT) | |
304 | return -errno; | |
305 | ||
306 | if (proc_mounted() == 0) | |
307 | return -ENOSYS; /* if we have no /proc/, the concept is not implementable */ | |
308 | ||
309 | return -ENOENT; | |
310 | } | |
4dfaa528 FB |
311 | |
312 | return 0; | |
313 | } | |
314 | ||
22ed4a6d LP |
315 | int stat_warn_permissions(const char *path, const struct stat *st) { |
316 | assert(path); | |
317 | assert(st); | |
f4f15635 | 318 | |
b6cceaae | 319 | /* Don't complain if we are reading something that is not a file, for example /dev/null */ |
22ed4a6d | 320 | if (!S_ISREG(st->st_mode)) |
b6cceaae LP |
321 | return 0; |
322 | ||
22ed4a6d | 323 | if (st->st_mode & 0111) |
f4f15635 LP |
324 | log_warning("Configuration file %s is marked executable. Please remove executable permission bits. Proceeding anyway.", path); |
325 | ||
22ed4a6d | 326 | if (st->st_mode & 0002) |
f4f15635 LP |
327 | log_warning("Configuration file %s is marked world-writable. Please remove world writability permission bits. Proceeding anyway.", path); |
328 | ||
22ed4a6d | 329 | if (getpid_cached() == 1 && (st->st_mode & 0044) != 0044) |
f4f15635 LP |
330 | log_warning("Configuration file %s is marked world-inaccessible. This has no effect as configuration data is accessible via APIs without restrictions. Proceeding anyway.", path); |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
22ed4a6d LP |
335 | int fd_warn_permissions(const char *path, int fd) { |
336 | struct stat st; | |
337 | ||
338 | assert(path); | |
339 | assert(fd >= 0); | |
340 | ||
341 | if (fstat(fd, &st) < 0) | |
342 | return -errno; | |
343 | ||
344 | return stat_warn_permissions(path, &st); | |
345 | } | |
346 | ||
f4f15635 | 347 | int touch_file(const char *path, bool parents, usec_t stamp, uid_t uid, gid_t gid, mode_t mode) { |
9e3fa6e8 LP |
348 | char fdpath[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)]; |
349 | _cleanup_close_ int fd = -1; | |
350 | int r, ret = 0; | |
f4f15635 LP |
351 | |
352 | assert(path); | |
353 | ||
9e3fa6e8 LP |
354 | /* Note that touch_file() does not follow symlinks: if invoked on an existing symlink, then it is the symlink |
355 | * itself which is updated, not its target | |
356 | * | |
357 | * Returns the first error we encounter, but tries to apply as much as possible. */ | |
f4f15635 | 358 | |
9e3fa6e8 LP |
359 | if (parents) |
360 | (void) mkdir_parents(path, 0755); | |
361 | ||
362 | /* Initially, we try to open the node with O_PATH, so that we get a reference to the node. This is useful in | |
363 | * case the path refers to an existing device or socket node, as we can open it successfully in all cases, and | |
364 | * won't trigger any driver magic or so. */ | |
365 | fd = open(path, O_PATH|O_CLOEXEC|O_NOFOLLOW); | |
366 | if (fd < 0) { | |
367 | if (errno != ENOENT) | |
f4f15635 | 368 | return -errno; |
f4f15635 | 369 | |
9e3fa6e8 LP |
370 | /* if the node doesn't exist yet, we create it, but with O_EXCL, so that we only create a regular file |
371 | * here, and nothing else */ | |
372 | fd = open(path, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, IN_SET(mode, 0, MODE_INVALID) ? 0644 : mode); | |
373 | if (fd < 0) | |
f4f15635 LP |
374 | return -errno; |
375 | } | |
376 | ||
9e3fa6e8 LP |
377 | /* Let's make a path from the fd, and operate on that. With this logic, we can adjust the access mode, |
378 | * ownership and time of the file node in all cases, even if the fd refers to an O_PATH object — which is | |
379 | * something fchown(), fchmod(), futimensat() don't allow. */ | |
380 | xsprintf(fdpath, "/proc/self/fd/%i", fd); | |
381 | ||
4b3b5bc7 | 382 | ret = fchmod_and_chown(fd, mode, uid, gid); |
9e3fa6e8 | 383 | |
f4f15635 LP |
384 | if (stamp != USEC_INFINITY) { |
385 | struct timespec ts[2]; | |
386 | ||
387 | timespec_store(&ts[0], stamp); | |
388 | ts[1] = ts[0]; | |
9e3fa6e8 | 389 | r = utimensat(AT_FDCWD, fdpath, ts, 0); |
f4f15635 | 390 | } else |
9e3fa6e8 LP |
391 | r = utimensat(AT_FDCWD, fdpath, NULL, 0); |
392 | if (r < 0 && ret >= 0) | |
f4f15635 LP |
393 | return -errno; |
394 | ||
9e3fa6e8 | 395 | return ret; |
f4f15635 LP |
396 | } |
397 | ||
398 | int touch(const char *path) { | |
ee735086 | 399 | return touch_file(path, false, USEC_INFINITY, UID_INVALID, GID_INVALID, MODE_INVALID); |
f4f15635 LP |
400 | } |
401 | ||
6c9c51e5 YW |
402 | int symlink_idempotent(const char *from, const char *to, bool make_relative) { |
403 | _cleanup_free_ char *relpath = NULL; | |
f4f15635 LP |
404 | int r; |
405 | ||
406 | assert(from); | |
407 | assert(to); | |
408 | ||
6c9c51e5 YW |
409 | if (make_relative) { |
410 | _cleanup_free_ char *parent = NULL; | |
411 | ||
412 | parent = dirname_malloc(to); | |
413 | if (!parent) | |
414 | return -ENOMEM; | |
415 | ||
416 | r = path_make_relative(parent, from, &relpath); | |
417 | if (r < 0) | |
418 | return r; | |
419 | ||
420 | from = relpath; | |
421 | } | |
422 | ||
f4f15635 | 423 | if (symlink(from, to) < 0) { |
77b79723 LP |
424 | _cleanup_free_ char *p = NULL; |
425 | ||
f4f15635 LP |
426 | if (errno != EEXIST) |
427 | return -errno; | |
428 | ||
429 | r = readlink_malloc(to, &p); | |
77b79723 LP |
430 | if (r == -EINVAL) /* Not a symlink? In that case return the original error we encountered: -EEXIST */ |
431 | return -EEXIST; | |
432 | if (r < 0) /* Any other error? In that case propagate it as is */ | |
f4f15635 LP |
433 | return r; |
434 | ||
77b79723 LP |
435 | if (!streq(p, from)) /* Not the symlink we want it to be? In that case, propagate the original -EEXIST */ |
436 | return -EEXIST; | |
f4f15635 LP |
437 | } |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
442 | int symlink_atomic(const char *from, const char *to) { | |
443 | _cleanup_free_ char *t = NULL; | |
444 | int r; | |
445 | ||
446 | assert(from); | |
447 | assert(to); | |
448 | ||
449 | r = tempfn_random(to, NULL, &t); | |
450 | if (r < 0) | |
451 | return r; | |
452 | ||
453 | if (symlink(from, t) < 0) | |
454 | return -errno; | |
455 | ||
456 | if (rename(t, to) < 0) { | |
457 | unlink_noerrno(t); | |
458 | return -errno; | |
459 | } | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
464 | int mknod_atomic(const char *path, mode_t mode, dev_t dev) { | |
465 | _cleanup_free_ char *t = NULL; | |
466 | int r; | |
467 | ||
468 | assert(path); | |
469 | ||
470 | r = tempfn_random(path, NULL, &t); | |
471 | if (r < 0) | |
472 | return r; | |
473 | ||
474 | if (mknod(t, mode, dev) < 0) | |
475 | return -errno; | |
476 | ||
477 | if (rename(t, path) < 0) { | |
478 | unlink_noerrno(t); | |
479 | return -errno; | |
480 | } | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
485 | int mkfifo_atomic(const char *path, mode_t mode) { | |
486 | _cleanup_free_ char *t = NULL; | |
487 | int r; | |
488 | ||
489 | assert(path); | |
490 | ||
491 | r = tempfn_random(path, NULL, &t); | |
492 | if (r < 0) | |
493 | return r; | |
494 | ||
495 | if (mkfifo(t, mode) < 0) | |
496 | return -errno; | |
497 | ||
498 | if (rename(t, path) < 0) { | |
4fe3828c FB |
499 | unlink_noerrno(t); |
500 | return -errno; | |
501 | } | |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
506 | int mkfifoat_atomic(int dirfd, const char *path, mode_t mode) { | |
507 | _cleanup_free_ char *t = NULL; | |
508 | int r; | |
509 | ||
510 | assert(path); | |
511 | ||
512 | if (path_is_absolute(path)) | |
513 | return mkfifo_atomic(path, mode); | |
514 | ||
515 | /* We're only interested in the (random) filename. */ | |
516 | r = tempfn_random_child("", NULL, &t); | |
517 | if (r < 0) | |
518 | return r; | |
519 | ||
520 | if (mkfifoat(dirfd, t, mode) < 0) | |
521 | return -errno; | |
522 | ||
523 | if (renameat(dirfd, t, dirfd, path) < 0) { | |
f4f15635 LP |
524 | unlink_noerrno(t); |
525 | return -errno; | |
526 | } | |
527 | ||
528 | return 0; | |
529 | } | |
530 | ||
531 | int get_files_in_directory(const char *path, char ***list) { | |
532 | _cleanup_closedir_ DIR *d = NULL; | |
8fb3f009 | 533 | struct dirent *de; |
f4f15635 LP |
534 | size_t bufsize = 0, n = 0; |
535 | _cleanup_strv_free_ char **l = NULL; | |
536 | ||
537 | assert(path); | |
538 | ||
539 | /* Returns all files in a directory in *list, and the number | |
540 | * of files as return value. If list is NULL returns only the | |
541 | * number. */ | |
542 | ||
543 | d = opendir(path); | |
544 | if (!d) | |
545 | return -errno; | |
546 | ||
8fb3f009 | 547 | FOREACH_DIRENT_ALL(de, d, return -errno) { |
f4f15635 LP |
548 | dirent_ensure_type(d, de); |
549 | ||
550 | if (!dirent_is_file(de)) | |
551 | continue; | |
552 | ||
553 | if (list) { | |
554 | /* one extra slot is needed for the terminating NULL */ | |
555 | if (!GREEDY_REALLOC(l, bufsize, n + 2)) | |
556 | return -ENOMEM; | |
557 | ||
558 | l[n] = strdup(de->d_name); | |
559 | if (!l[n]) | |
560 | return -ENOMEM; | |
561 | ||
562 | l[++n] = NULL; | |
563 | } else | |
564 | n++; | |
565 | } | |
566 | ||
ae2a15bc LP |
567 | if (list) |
568 | *list = TAKE_PTR(l); | |
f4f15635 LP |
569 | |
570 | return n; | |
571 | } | |
430fbf8e | 572 | |
992e8f22 LP |
573 | static int getenv_tmp_dir(const char **ret_path) { |
574 | const char *n; | |
575 | int r, ret = 0; | |
34a8f081 | 576 | |
992e8f22 | 577 | assert(ret_path); |
34a8f081 | 578 | |
992e8f22 LP |
579 | /* We use the same order of environment variables python uses in tempfile.gettempdir(): |
580 | * https://docs.python.org/3/library/tempfile.html#tempfile.gettempdir */ | |
581 | FOREACH_STRING(n, "TMPDIR", "TEMP", "TMP") { | |
582 | const char *e; | |
583 | ||
584 | e = secure_getenv(n); | |
585 | if (!e) | |
586 | continue; | |
587 | if (!path_is_absolute(e)) { | |
588 | r = -ENOTDIR; | |
589 | goto next; | |
590 | } | |
99be45a4 | 591 | if (!path_is_normalized(e)) { |
992e8f22 LP |
592 | r = -EPERM; |
593 | goto next; | |
594 | } | |
595 | ||
596 | r = is_dir(e, true); | |
597 | if (r < 0) | |
598 | goto next; | |
599 | if (r == 0) { | |
600 | r = -ENOTDIR; | |
601 | goto next; | |
602 | } | |
603 | ||
604 | *ret_path = e; | |
605 | return 1; | |
606 | ||
607 | next: | |
608 | /* Remember first error, to make this more debuggable */ | |
609 | if (ret >= 0) | |
610 | ret = r; | |
34a8f081 OW |
611 | } |
612 | ||
992e8f22 LP |
613 | if (ret < 0) |
614 | return ret; | |
34a8f081 | 615 | |
992e8f22 LP |
616 | *ret_path = NULL; |
617 | return ret; | |
618 | } | |
34a8f081 | 619 | |
992e8f22 LP |
620 | static int tmp_dir_internal(const char *def, const char **ret) { |
621 | const char *e; | |
622 | int r, k; | |
623 | ||
624 | assert(def); | |
625 | assert(ret); | |
626 | ||
627 | r = getenv_tmp_dir(&e); | |
628 | if (r > 0) { | |
629 | *ret = e; | |
630 | return 0; | |
631 | } | |
632 | ||
633 | k = is_dir(def, true); | |
634 | if (k == 0) | |
635 | k = -ENOTDIR; | |
636 | if (k < 0) | |
637 | return r < 0 ? r : k; | |
638 | ||
639 | *ret = def; | |
34a8f081 OW |
640 | return 0; |
641 | } | |
642 | ||
992e8f22 LP |
643 | int var_tmp_dir(const char **ret) { |
644 | ||
645 | /* Returns the location for "larger" temporary files, that is backed by physical storage if available, and thus | |
646 | * even might survive a boot: /var/tmp. If $TMPDIR (or related environment variables) are set, its value is | |
647 | * returned preferably however. Note that both this function and tmp_dir() below are affected by $TMPDIR, | |
648 | * making it a variable that overrides all temporary file storage locations. */ | |
649 | ||
650 | return tmp_dir_internal("/var/tmp", ret); | |
651 | } | |
652 | ||
653 | int tmp_dir(const char **ret) { | |
654 | ||
655 | /* Similar to var_tmp_dir() above, but returns the location for "smaller" temporary files, which is usually | |
656 | * backed by an in-memory file system: /tmp. */ | |
657 | ||
658 | return tmp_dir_internal("/tmp", ret); | |
659 | } | |
660 | ||
af229d7a ZJS |
661 | int unlink_or_warn(const char *filename) { |
662 | if (unlink(filename) < 0 && errno != ENOENT) | |
663 | /* If the file doesn't exist and the fs simply was read-only (in which | |
664 | * case unlink() returns EROFS even if the file doesn't exist), don't | |
665 | * complain */ | |
666 | if (errno != EROFS || access(filename, F_OK) >= 0) | |
667 | return log_error_errno(errno, "Failed to remove \"%s\": %m", filename); | |
668 | ||
669 | return 0; | |
670 | } | |
671 | ||
430fbf8e | 672 | int inotify_add_watch_fd(int fd, int what, uint32_t mask) { |
fbd0b64f | 673 | char path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int) + 1]; |
f6f4f5fe | 674 | int wd; |
430fbf8e LP |
675 | |
676 | /* This is like inotify_add_watch(), except that the file to watch is not referenced by a path, but by an fd */ | |
677 | xsprintf(path, "/proc/self/fd/%i", what); | |
678 | ||
f6f4f5fe BP |
679 | wd = inotify_add_watch(fd, path, mask); |
680 | if (wd < 0) | |
430fbf8e LP |
681 | return -errno; |
682 | ||
f6f4f5fe | 683 | return wd; |
430fbf8e | 684 | } |
d944dc95 | 685 | |
27c3112d | 686 | int inotify_add_watch_and_warn(int fd, const char *pathname, uint32_t mask) { |
f6f4f5fe | 687 | int wd; |
27c3112d | 688 | |
f6f4f5fe BP |
689 | wd = inotify_add_watch(fd, pathname, mask); |
690 | if (wd < 0) { | |
27c3112d | 691 | if (errno == ENOSPC) |
fe573a79 | 692 | return log_error_errno(errno, "Failed to add a watch for %s: inotify watch limit reached", pathname); |
27c3112d | 693 | |
fe573a79 | 694 | return log_error_errno(errno, "Failed to add a watch for %s: %m", pathname); |
27c3112d FB |
695 | } |
696 | ||
f6f4f5fe | 697 | return wd; |
27c3112d FB |
698 | } |
699 | ||
b85ee2ec | 700 | static bool unsafe_transition(const struct stat *a, const struct stat *b) { |
f14f1806 LP |
701 | /* Returns true if the transition from a to b is safe, i.e. that we never transition from unprivileged to |
702 | * privileged files or directories. Why bother? So that unprivileged code can't symlink to privileged files | |
703 | * making us believe we read something safe even though it isn't safe in the specific context we open it in. */ | |
704 | ||
705 | if (a->st_uid == 0) /* Transitioning from privileged to unprivileged is always fine */ | |
b85ee2ec | 706 | return false; |
f14f1806 | 707 | |
b85ee2ec | 708 | return a->st_uid != b->st_uid; /* Otherwise we need to stay within the same UID */ |
f14f1806 LP |
709 | } |
710 | ||
fd74c6f3 FB |
711 | static int log_unsafe_transition(int a, int b, const char *path, unsigned flags) { |
712 | _cleanup_free_ char *n1 = NULL, *n2 = NULL; | |
713 | ||
714 | if (!FLAGS_SET(flags, CHASE_WARN)) | |
36c97dec | 715 | return -ENOLINK; |
fd74c6f3 FB |
716 | |
717 | (void) fd_get_path(a, &n1); | |
718 | (void) fd_get_path(b, &n2); | |
719 | ||
36c97dec | 720 | return log_warning_errno(SYNTHETIC_ERRNO(ENOLINK), |
fd74c6f3 | 721 | "Detected unsafe path transition %s %s %s during canonicalization of %s.", |
48d837cd | 722 | strna(n1), special_glyph(SPECIAL_GLYPH_ARROW), strna(n2), path); |
fd74c6f3 FB |
723 | } |
724 | ||
145b8d0f FB |
725 | static int log_autofs_mount_point(int fd, const char *path, unsigned flags) { |
726 | _cleanup_free_ char *n1 = NULL; | |
727 | ||
728 | if (!FLAGS_SET(flags, CHASE_WARN)) | |
729 | return -EREMOTE; | |
730 | ||
731 | (void) fd_get_path(fd, &n1); | |
732 | ||
733 | return log_warning_errno(SYNTHETIC_ERRNO(EREMOTE), | |
734 | "Detected autofs mount point %s during canonicalization of %s.", | |
48d837cd | 735 | strna(n1), path); |
f14f1806 LP |
736 | } |
737 | ||
a5648b80 | 738 | int chase_symlinks(const char *path, const char *original_root, unsigned flags, char **ret_path, int *ret_fd) { |
d944dc95 LP |
739 | _cleanup_free_ char *buffer = NULL, *done = NULL, *root = NULL; |
740 | _cleanup_close_ int fd = -1; | |
f10f4215 | 741 | unsigned max_follow = CHASE_SYMLINKS_MAX; /* how many symlinks to follow before giving up and returning ELOOP */ |
f14f1806 | 742 | struct stat previous_stat; |
a9fb0867 | 743 | bool exists = true; |
d944dc95 LP |
744 | char *todo; |
745 | int r; | |
746 | ||
747 | assert(path); | |
748 | ||
1ed34d75 | 749 | /* Either the file may be missing, or we return an fd to the final object, but both make no sense */ |
a5648b80 | 750 | if ((flags & CHASE_NONEXISTENT) && ret_fd) |
1ed34d75 LP |
751 | return -EINVAL; |
752 | ||
a5648b80 | 753 | if ((flags & CHASE_STEP) && ret_fd) |
49eb3659 LP |
754 | return -EINVAL; |
755 | ||
a49424af LP |
756 | if (isempty(path)) |
757 | return -EINVAL; | |
758 | ||
d944dc95 LP |
759 | /* This is a lot like canonicalize_file_name(), but takes an additional "root" parameter, that allows following |
760 | * symlinks relative to a root directory, instead of the root of the host. | |
761 | * | |
fc4b68e5 | 762 | * Note that "root" primarily matters if we encounter an absolute symlink. It is also used when following |
c4f4fce7 LP |
763 | * relative symlinks to ensure they cannot be used to "escape" the root directory. The path parameter passed is |
764 | * assumed to be already prefixed by it, except if the CHASE_PREFIX_ROOT flag is set, in which case it is first | |
765 | * prefixed accordingly. | |
d944dc95 LP |
766 | * |
767 | * Algorithmically this operates on two path buffers: "done" are the components of the path we already | |
768 | * processed and resolved symlinks, "." and ".." of. "todo" are the components of the path we still need to | |
769 | * process. On each iteration, we move one component from "todo" to "done", processing it's special meaning | |
770 | * each time. The "todo" path always starts with at least one slash, the "done" path always ends in no | |
771 | * slash. We always keep an O_PATH fd to the component we are currently processing, thus keeping lookup races | |
4293c32b | 772 | * to a minimum. |
fc4b68e5 LP |
773 | * |
774 | * Suggested usage: whenever you want to canonicalize a path, use this function. Pass the absolute path you got | |
775 | * as-is: fully qualified and relative to your host's root. Optionally, specify the root parameter to tell this | |
776 | * function what to do when encountering a symlink with an absolute path as directory: prefix it by the | |
49eb3659 LP |
777 | * specified path. |
778 | * | |
a5648b80 | 779 | * There are five ways to invoke this function: |
49eb3659 | 780 | * |
a5648b80 ZJS |
781 | * 1. Without CHASE_STEP or ret_fd: in this case the path is resolved and the normalized path is |
782 | * returned in `ret_path`. The return value is < 0 on error. If CHASE_NONEXISTENT is also set, 0 | |
783 | * is returned if the file doesn't exist, > 0 otherwise. If CHASE_NONEXISTENT is not set, >= 0 is | |
784 | * returned if the destination was found, -ENOENT if it wasn't. | |
49eb3659 | 785 | * |
a5648b80 | 786 | * 2. With ret_fd: in this case the destination is opened after chasing it as O_PATH and this file |
49eb3659 LP |
787 | * descriptor is returned as return value. This is useful to open files relative to some root |
788 | * directory. Note that the returned O_PATH file descriptors must be converted into a regular one (using | |
a5648b80 | 789 | * fd_reopen() or such) before it can be used for reading/writing. ret_fd may not be combined with |
49eb3659 LP |
790 | * CHASE_NONEXISTENT. |
791 | * | |
792 | * 3. With CHASE_STEP: in this case only a single step of the normalization is executed, i.e. only the first | |
793 | * symlink or ".." component of the path is resolved, and the resulting path is returned. This is useful if | |
794 | * a caller wants to trace the a path through the file system verbosely. Returns < 0 on error, > 0 if the | |
795 | * path is fully normalized, and == 0 for each normalization step. This may be combined with | |
796 | * CHASE_NONEXISTENT, in which case 1 is returned when a component is not found. | |
797 | * | |
36c97dec FB |
798 | * 4. With CHASE_SAFE: in this case the path must not contain unsafe transitions, i.e. transitions from |
799 | * unprivileged to privileged files or directories. In such cases the return value is -ENOLINK. If | |
4293c32b | 800 | * CHASE_WARN is also set, a warning describing the unsafe transition is emitted. |
36c97dec | 801 | * |
4293c32b ZJS |
802 | * 5. With CHASE_NO_AUTOFS: in this case if an autofs mount point is encountered, path normalization |
803 | * is aborted and -EREMOTE is returned. If CHASE_WARN is also set, a warning showing the path of | |
804 | * the mount point is emitted. | |
4293c32b | 805 | */ |
d944dc95 | 806 | |
22bc57c5 | 807 | /* A root directory of "/" or "" is identical to none */ |
57ea45e1 | 808 | if (empty_or_root(original_root)) |
22bc57c5 | 809 | original_root = NULL; |
b1bfb848 | 810 | |
a5648b80 ZJS |
811 | if (!original_root && !ret_path && !(flags & (CHASE_NONEXISTENT|CHASE_NO_AUTOFS|CHASE_SAFE|CHASE_STEP)) && ret_fd) { |
812 | /* Shortcut the ret_fd case if the caller isn't interested in the actual path and has no root set | |
244d2f07 | 813 | * and doesn't care about any of the other special features we provide either. */ |
1f56e4ce | 814 | r = open(path, O_PATH|O_CLOEXEC|((flags & CHASE_NOFOLLOW) ? O_NOFOLLOW : 0)); |
244d2f07 LP |
815 | if (r < 0) |
816 | return -errno; | |
817 | ||
a5648b80 ZJS |
818 | *ret_fd = r; |
819 | return 0; | |
244d2f07 LP |
820 | } |
821 | ||
c4f4fce7 LP |
822 | if (original_root) { |
823 | r = path_make_absolute_cwd(original_root, &root); | |
d944dc95 LP |
824 | if (r < 0) |
825 | return r; | |
c4f4fce7 | 826 | |
47d7ab72 LP |
827 | /* Simplify the root directory, so that it has no duplicate slashes and nothing at the |
828 | * end. While we won't resolve the root path we still simplify it. Note that dropping the | |
829 | * trailing slash should not change behaviour, since when opening it we specify O_DIRECTORY | |
830 | * anyway. Moreover at the end of this function after processing everything we'll always turn | |
831 | * the empty string back to "/". */ | |
832 | delete_trailing_chars(root, "/"); | |
833 | path_simplify(root, true); | |
834 | ||
382a5078 | 835 | if (flags & CHASE_PREFIX_ROOT) { |
382a5078 LP |
836 | /* We don't support relative paths in combination with a root directory */ |
837 | if (!path_is_absolute(path)) | |
838 | return -EINVAL; | |
839 | ||
c4f4fce7 | 840 | path = prefix_roota(root, path); |
382a5078 | 841 | } |
d944dc95 LP |
842 | } |
843 | ||
c4f4fce7 LP |
844 | r = path_make_absolute_cwd(path, &buffer); |
845 | if (r < 0) | |
846 | return r; | |
847 | ||
c2595d3b | 848 | fd = open(root ?: "/", O_CLOEXEC|O_DIRECTORY|O_PATH); |
d944dc95 LP |
849 | if (fd < 0) |
850 | return -errno; | |
851 | ||
f14f1806 LP |
852 | if (flags & CHASE_SAFE) { |
853 | if (fstat(fd, &previous_stat) < 0) | |
854 | return -errno; | |
855 | } | |
856 | ||
c2595d3b LP |
857 | if (root) { |
858 | _cleanup_free_ char *absolute = NULL; | |
859 | const char *e; | |
860 | ||
861 | /* If we are operating on a root directory, let's take the root directory as it is. */ | |
862 | ||
863 | e = path_startswith(buffer, root); | |
864 | if (!e) | |
865 | return log_full_errno(flags & CHASE_WARN ? LOG_WARNING : LOG_DEBUG, | |
866 | SYNTHETIC_ERRNO(ECHRNG), | |
867 | "Specified path '%s' is outside of specified root directory '%s', refusing to resolve.", | |
868 | path, root); | |
869 | ||
c2595d3b LP |
870 | done = strdup(root); |
871 | if (!done) | |
872 | return -ENOMEM; | |
c2595d3b LP |
873 | |
874 | /* Make sure "todo" starts with a slash */ | |
875 | absolute = strjoin("/", e); | |
876 | if (!absolute) | |
877 | return -ENOMEM; | |
878 | ||
879 | free_and_replace(buffer, absolute); | |
880 | } | |
881 | ||
d944dc95 LP |
882 | todo = buffer; |
883 | for (;;) { | |
884 | _cleanup_free_ char *first = NULL; | |
885 | _cleanup_close_ int child = -1; | |
886 | struct stat st; | |
887 | size_t n, m; | |
888 | ||
889 | /* Determine length of first component in the path */ | |
890 | n = strspn(todo, "/"); /* The slashes */ | |
47d7ab72 LP |
891 | |
892 | if (n > 1) { | |
893 | /* If we are looking at more than a single slash then skip all but one, so that when | |
894 | * we are done with everything we have a normalized path with only single slashes | |
895 | * separating the path components. */ | |
896 | todo += n - 1; | |
897 | n = 1; | |
898 | } | |
899 | ||
d944dc95 LP |
900 | m = n + strcspn(todo + n, "/"); /* The entire length of the component */ |
901 | ||
902 | /* Extract the first component. */ | |
903 | first = strndup(todo, m); | |
904 | if (!first) | |
905 | return -ENOMEM; | |
906 | ||
907 | todo += m; | |
908 | ||
b12d25a8 ZJS |
909 | /* Empty? Then we reached the end. */ |
910 | if (isempty(first)) | |
911 | break; | |
912 | ||
d944dc95 | 913 | /* Just a single slash? Then we reached the end. */ |
b12d25a8 ZJS |
914 | if (path_equal(first, "/")) { |
915 | /* Preserve the trailing slash */ | |
62570f6f LP |
916 | |
917 | if (flags & CHASE_TRAIL_SLASH) | |
918 | if (!strextend(&done, "/", NULL)) | |
919 | return -ENOMEM; | |
b12d25a8 | 920 | |
d944dc95 | 921 | break; |
b12d25a8 | 922 | } |
d944dc95 LP |
923 | |
924 | /* Just a dot? Then let's eat this up. */ | |
925 | if (path_equal(first, "/.")) | |
926 | continue; | |
927 | ||
928 | /* Two dots? Then chop off the last bit of what we already found out. */ | |
929 | if (path_equal(first, "/..")) { | |
930 | _cleanup_free_ char *parent = NULL; | |
2b6d2dda | 931 | _cleanup_close_ int fd_parent = -1; |
d944dc95 | 932 | |
a4eaf3cf LP |
933 | /* If we already are at the top, then going up will not change anything. This is in-line with |
934 | * how the kernel handles this. */ | |
57ea45e1 | 935 | if (empty_or_root(done)) |
a4eaf3cf | 936 | continue; |
d944dc95 LP |
937 | |
938 | parent = dirname_malloc(done); | |
939 | if (!parent) | |
940 | return -ENOMEM; | |
941 | ||
a4eaf3cf | 942 | /* Don't allow this to leave the root dir. */ |
d944dc95 LP |
943 | if (root && |
944 | path_startswith(done, root) && | |
945 | !path_startswith(parent, root)) | |
a4eaf3cf | 946 | continue; |
d944dc95 | 947 | |
3b319885 | 948 | free_and_replace(done, parent); |
d944dc95 | 949 | |
49eb3659 LP |
950 | if (flags & CHASE_STEP) |
951 | goto chased_one; | |
952 | ||
d944dc95 LP |
953 | fd_parent = openat(fd, "..", O_CLOEXEC|O_NOFOLLOW|O_PATH); |
954 | if (fd_parent < 0) | |
955 | return -errno; | |
956 | ||
f14f1806 LP |
957 | if (flags & CHASE_SAFE) { |
958 | if (fstat(fd_parent, &st) < 0) | |
959 | return -errno; | |
960 | ||
b85ee2ec | 961 | if (unsafe_transition(&previous_stat, &st)) |
fd74c6f3 | 962 | return log_unsafe_transition(fd, fd_parent, path, flags); |
f14f1806 LP |
963 | |
964 | previous_stat = st; | |
965 | } | |
966 | ||
d944dc95 | 967 | safe_close(fd); |
c10d6bdb | 968 | fd = TAKE_FD(fd_parent); |
d944dc95 LP |
969 | |
970 | continue; | |
971 | } | |
972 | ||
973 | /* Otherwise let's see what this is. */ | |
974 | child = openat(fd, first + n, O_CLOEXEC|O_NOFOLLOW|O_PATH); | |
a9fb0867 LP |
975 | if (child < 0) { |
976 | ||
977 | if (errno == ENOENT && | |
cb638b5e | 978 | (flags & CHASE_NONEXISTENT) && |
99be45a4 | 979 | (isempty(todo) || path_is_normalized(todo))) { |
a9fb0867 | 980 | |
cb638b5e | 981 | /* If CHASE_NONEXISTENT is set, and the path does not exist, then that's OK, return |
a9fb0867 LP |
982 | * what we got so far. But don't allow this if the remaining path contains "../ or "./" |
983 | * or something else weird. */ | |
984 | ||
a1904a46 YW |
985 | /* If done is "/", as first also contains slash at the head, then remove this redundant slash. */ |
986 | if (streq_ptr(done, "/")) | |
987 | *done = '\0'; | |
988 | ||
a9fb0867 LP |
989 | if (!strextend(&done, first, todo, NULL)) |
990 | return -ENOMEM; | |
991 | ||
992 | exists = false; | |
993 | break; | |
994 | } | |
995 | ||
d944dc95 | 996 | return -errno; |
a9fb0867 | 997 | } |
d944dc95 LP |
998 | |
999 | if (fstat(child, &st) < 0) | |
1000 | return -errno; | |
f14f1806 | 1001 | if ((flags & CHASE_SAFE) && |
b85ee2ec | 1002 | unsafe_transition(&previous_stat, &st)) |
fd74c6f3 | 1003 | return log_unsafe_transition(fd, child, path, flags); |
f14f1806 LP |
1004 | |
1005 | previous_stat = st; | |
1006 | ||
655f2da0 | 1007 | if ((flags & CHASE_NO_AUTOFS) && |
a66fee2e | 1008 | fd_is_fs_type(child, AUTOFS_SUPER_MAGIC) > 0) |
145b8d0f | 1009 | return log_autofs_mount_point(child, path, flags); |
d944dc95 | 1010 | |
1f56e4ce | 1011 | if (S_ISLNK(st.st_mode) && !((flags & CHASE_NOFOLLOW) && isempty(todo))) { |
877777d7 | 1012 | char *joined; |
d944dc95 LP |
1013 | _cleanup_free_ char *destination = NULL; |
1014 | ||
1015 | /* This is a symlink, in this case read the destination. But let's make sure we don't follow | |
1016 | * symlinks without bounds. */ | |
1017 | if (--max_follow <= 0) | |
1018 | return -ELOOP; | |
1019 | ||
1020 | r = readlinkat_malloc(fd, first + n, &destination); | |
1021 | if (r < 0) | |
1022 | return r; | |
1023 | if (isempty(destination)) | |
1024 | return -EINVAL; | |
1025 | ||
1026 | if (path_is_absolute(destination)) { | |
1027 | ||
1028 | /* An absolute destination. Start the loop from the beginning, but use the root | |
1029 | * directory as base. */ | |
1030 | ||
1031 | safe_close(fd); | |
c2595d3b | 1032 | fd = open(root ?: "/", O_CLOEXEC|O_DIRECTORY|O_PATH); |
d944dc95 LP |
1033 | if (fd < 0) |
1034 | return -errno; | |
1035 | ||
f14f1806 LP |
1036 | if (flags & CHASE_SAFE) { |
1037 | if (fstat(fd, &st) < 0) | |
1038 | return -errno; | |
1039 | ||
b85ee2ec | 1040 | if (unsafe_transition(&previous_stat, &st)) |
fd74c6f3 | 1041 | return log_unsafe_transition(child, fd, path, flags); |
f14f1806 LP |
1042 | |
1043 | previous_stat = st; | |
1044 | } | |
1045 | ||
b539437a YW |
1046 | free(done); |
1047 | ||
d944dc95 LP |
1048 | /* Note that we do not revalidate the root, we take it as is. */ |
1049 | if (isempty(root)) | |
1050 | done = NULL; | |
1051 | else { | |
1052 | done = strdup(root); | |
1053 | if (!done) | |
1054 | return -ENOMEM; | |
1055 | } | |
1056 | ||
8c4a8ea2 LP |
1057 | /* Prefix what's left to do with what we just read, and start the loop again, but |
1058 | * remain in the current directory. */ | |
2d9b74ba | 1059 | joined = path_join(destination, todo); |
8c4a8ea2 | 1060 | } else |
2d9b74ba | 1061 | joined = path_join("/", destination, todo); |
877777d7 CCW |
1062 | if (!joined) |
1063 | return -ENOMEM; | |
d944dc95 | 1064 | |
877777d7 CCW |
1065 | free(buffer); |
1066 | todo = buffer = joined; | |
d944dc95 | 1067 | |
49eb3659 LP |
1068 | if (flags & CHASE_STEP) |
1069 | goto chased_one; | |
1070 | ||
d944dc95 LP |
1071 | continue; |
1072 | } | |
1073 | ||
1074 | /* If this is not a symlink, then let's just add the name we read to what we already verified. */ | |
ae2a15bc LP |
1075 | if (!done) |
1076 | done = TAKE_PTR(first); | |
1077 | else { | |
a1904a46 YW |
1078 | /* If done is "/", as first also contains slash at the head, then remove this redundant slash. */ |
1079 | if (streq(done, "/")) | |
1080 | *done = '\0'; | |
1081 | ||
d944dc95 LP |
1082 | if (!strextend(&done, first, NULL)) |
1083 | return -ENOMEM; | |
1084 | } | |
1085 | ||
1086 | /* And iterate again, but go one directory further down. */ | |
1087 | safe_close(fd); | |
c10d6bdb | 1088 | fd = TAKE_FD(child); |
d944dc95 LP |
1089 | } |
1090 | ||
1091 | if (!done) { | |
1092 | /* Special case, turn the empty string into "/", to indicate the root directory. */ | |
1093 | done = strdup("/"); | |
1094 | if (!done) | |
1095 | return -ENOMEM; | |
1096 | } | |
1097 | ||
a5648b80 ZJS |
1098 | if (ret_path) |
1099 | *ret_path = TAKE_PTR(done); | |
d944dc95 | 1100 | |
a5648b80 ZJS |
1101 | if (ret_fd) { |
1102 | /* Return the O_PATH fd we currently are looking to the caller. It can translate it to a | |
1103 | * proper fd by opening /proc/self/fd/xyz. */ | |
1ed34d75 LP |
1104 | |
1105 | assert(fd >= 0); | |
a5648b80 | 1106 | *ret_fd = TAKE_FD(fd); |
1ed34d75 LP |
1107 | } |
1108 | ||
49eb3659 LP |
1109 | if (flags & CHASE_STEP) |
1110 | return 1; | |
1111 | ||
a9fb0867 | 1112 | return exists; |
49eb3659 LP |
1113 | |
1114 | chased_one: | |
a5648b80 | 1115 | if (ret_path) { |
49eb3659 LP |
1116 | char *c; |
1117 | ||
027cc9c9 ZJS |
1118 | c = strjoin(strempty(done), todo); |
1119 | if (!c) | |
1120 | return -ENOMEM; | |
49eb3659 | 1121 | |
a5648b80 | 1122 | *ret_path = c; |
49eb3659 LP |
1123 | } |
1124 | ||
1125 | return 0; | |
d944dc95 | 1126 | } |
57a4359e | 1127 | |
21c692e9 LP |
1128 | int chase_symlinks_and_open( |
1129 | const char *path, | |
1130 | const char *root, | |
1131 | unsigned chase_flags, | |
1132 | int open_flags, | |
1133 | char **ret_path) { | |
1134 | ||
1135 | _cleanup_close_ int path_fd = -1; | |
1136 | _cleanup_free_ char *p = NULL; | |
1137 | int r; | |
1138 | ||
1139 | if (chase_flags & CHASE_NONEXISTENT) | |
1140 | return -EINVAL; | |
1141 | ||
57ea45e1 | 1142 | if (empty_or_root(root) && !ret_path && (chase_flags & (CHASE_NO_AUTOFS|CHASE_SAFE)) == 0) { |
21c692e9 LP |
1143 | /* Shortcut this call if none of the special features of this call are requested */ |
1144 | r = open(path, open_flags); | |
1145 | if (r < 0) | |
1146 | return -errno; | |
1147 | ||
1148 | return r; | |
1149 | } | |
1150 | ||
a5648b80 ZJS |
1151 | r = chase_symlinks(path, root, chase_flags, ret_path ? &p : NULL, &path_fd); |
1152 | if (r < 0) | |
1153 | return r; | |
1154 | assert(path_fd >= 0); | |
21c692e9 LP |
1155 | |
1156 | r = fd_reopen(path_fd, open_flags); | |
1157 | if (r < 0) | |
1158 | return r; | |
1159 | ||
1160 | if (ret_path) | |
1161 | *ret_path = TAKE_PTR(p); | |
1162 | ||
1163 | return r; | |
1164 | } | |
1165 | ||
1166 | int chase_symlinks_and_opendir( | |
1167 | const char *path, | |
1168 | const char *root, | |
1169 | unsigned chase_flags, | |
1170 | char **ret_path, | |
1171 | DIR **ret_dir) { | |
1172 | ||
1173 | char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)]; | |
1174 | _cleanup_close_ int path_fd = -1; | |
1175 | _cleanup_free_ char *p = NULL; | |
1176 | DIR *d; | |
a5648b80 | 1177 | int r; |
21c692e9 LP |
1178 | |
1179 | if (!ret_dir) | |
1180 | return -EINVAL; | |
1181 | if (chase_flags & CHASE_NONEXISTENT) | |
1182 | return -EINVAL; | |
1183 | ||
57ea45e1 | 1184 | if (empty_or_root(root) && !ret_path && (chase_flags & (CHASE_NO_AUTOFS|CHASE_SAFE)) == 0) { |
21c692e9 LP |
1185 | /* Shortcut this call if none of the special features of this call are requested */ |
1186 | d = opendir(path); | |
1187 | if (!d) | |
1188 | return -errno; | |
1189 | ||
1190 | *ret_dir = d; | |
1191 | return 0; | |
1192 | } | |
1193 | ||
a5648b80 ZJS |
1194 | r = chase_symlinks(path, root, chase_flags, ret_path ? &p : NULL, &path_fd); |
1195 | if (r < 0) | |
1196 | return r; | |
1197 | assert(path_fd >= 0); | |
21c692e9 LP |
1198 | |
1199 | xsprintf(procfs_path, "/proc/self/fd/%i", path_fd); | |
1200 | d = opendir(procfs_path); | |
1201 | if (!d) | |
1202 | return -errno; | |
1203 | ||
1204 | if (ret_path) | |
1205 | *ret_path = TAKE_PTR(p); | |
1206 | ||
1207 | *ret_dir = d; | |
1208 | return 0; | |
1209 | } | |
1210 | ||
d2bcd0ba LP |
1211 | int chase_symlinks_and_stat( |
1212 | const char *path, | |
1213 | const char *root, | |
1214 | unsigned chase_flags, | |
1215 | char **ret_path, | |
a5648b80 ZJS |
1216 | struct stat *ret_stat, |
1217 | int *ret_fd) { | |
d2bcd0ba LP |
1218 | |
1219 | _cleanup_close_ int path_fd = -1; | |
1220 | _cleanup_free_ char *p = NULL; | |
a5648b80 | 1221 | int r; |
d2bcd0ba LP |
1222 | |
1223 | assert(path); | |
1224 | assert(ret_stat); | |
1225 | ||
1226 | if (chase_flags & CHASE_NONEXISTENT) | |
1227 | return -EINVAL; | |
1228 | ||
1229 | if (empty_or_root(root) && !ret_path && (chase_flags & (CHASE_NO_AUTOFS|CHASE_SAFE)) == 0) { | |
1230 | /* Shortcut this call if none of the special features of this call are requested */ | |
1231 | if (stat(path, ret_stat) < 0) | |
1232 | return -errno; | |
1233 | ||
1234 | return 1; | |
1235 | } | |
1236 | ||
a5648b80 ZJS |
1237 | r = chase_symlinks(path, root, chase_flags, ret_path ? &p : NULL, &path_fd); |
1238 | if (r < 0) | |
1239 | return r; | |
1240 | assert(path_fd >= 0); | |
d2bcd0ba LP |
1241 | |
1242 | if (fstat(path_fd, ret_stat) < 0) | |
1243 | return -errno; | |
1244 | ||
1245 | if (ret_path) | |
1246 | *ret_path = TAKE_PTR(p); | |
a5648b80 ZJS |
1247 | if (ret_fd) |
1248 | *ret_fd = TAKE_FD(path_fd); | |
d2bcd0ba LP |
1249 | |
1250 | return 1; | |
1251 | } | |
1252 | ||
57a4359e | 1253 | int access_fd(int fd, int mode) { |
fbd0b64f | 1254 | char p[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(fd) + 1]; |
57a4359e LP |
1255 | |
1256 | /* Like access() but operates on an already open fd */ | |
1257 | ||
1258 | xsprintf(p, "/proc/self/fd/%i", fd); | |
4265a66a LP |
1259 | if (access(p, mode) < 0) { |
1260 | if (errno != ENOENT) | |
1261 | return -errno; | |
57a4359e | 1262 | |
4265a66a LP |
1263 | /* ENOENT can mean two things: that the fd does not exist or that /proc is not mounted. Let's |
1264 | * make things debuggable and distinguish the two. */ | |
1265 | ||
1266 | if (proc_mounted() == 0) | |
1267 | return -ENOSYS; /* /proc is not available or not set up properly, we're most likely in some chroot | |
1268 | * environment. */ | |
1269 | ||
1270 | return -EBADF; /* The directory exists, hence it's the fd that doesn't. */ | |
1271 | } | |
1272 | ||
1273 | return 0; | |
57a4359e | 1274 | } |
43767d9d | 1275 | |
627d2bac ZJS |
1276 | void unlink_tempfilep(char (*p)[]) { |
1277 | /* If the file is created with mkstemp(), it will (almost always) | |
1278 | * change the suffix. Treat this as a sign that the file was | |
1279 | * successfully created. We ignore both the rare case where the | |
1280 | * original suffix is used and unlink failures. */ | |
1281 | if (!endswith(*p, ".XXXXXX")) | |
69821560 | 1282 | (void) unlink_noerrno(*p); |
627d2bac ZJS |
1283 | } |
1284 | ||
053e0626 | 1285 | int unlinkat_deallocate(int fd, const char *name, UnlinkDeallocateFlags flags) { |
43767d9d LP |
1286 | _cleanup_close_ int truncate_fd = -1; |
1287 | struct stat st; | |
1288 | off_t l, bs; | |
1289 | ||
053e0626 LP |
1290 | assert((flags & ~(UNLINK_REMOVEDIR|UNLINK_ERASE)) == 0); |
1291 | ||
43767d9d LP |
1292 | /* Operates like unlinkat() but also deallocates the file contents if it is a regular file and there's no other |
1293 | * link to it. This is useful to ensure that other processes that might have the file open for reading won't be | |
1294 | * able to keep the data pinned on disk forever. This call is particular useful whenever we execute clean-up | |
1295 | * jobs ("vacuuming"), where we want to make sure the data is really gone and the disk space released and | |
1296 | * returned to the free pool. | |
1297 | * | |
1298 | * Deallocation is preferably done by FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE (👊) if supported, which means | |
1299 | * the file won't change size. That's a good thing since we shouldn't needlessly trigger SIGBUS in other | |
1300 | * programs that have mmap()ed the file. (The assumption here is that changing file contents to all zeroes | |
1301 | * underneath those programs is the better choice than simply triggering SIGBUS in them which truncation does.) | |
1302 | * However if hole punching is not implemented in the kernel or file system we'll fall back to normal file | |
1303 | * truncation (🔪), as our goal of deallocating the data space trumps our goal of being nice to readers (💐). | |
1304 | * | |
1305 | * Note that we attempt deallocation, but failure to succeed with that is not considered fatal, as long as the | |
1306 | * primary job – to delete the file – is accomplished. */ | |
1307 | ||
053e0626 | 1308 | if (!FLAGS_SET(flags, UNLINK_REMOVEDIR)) { |
43767d9d LP |
1309 | truncate_fd = openat(fd, name, O_WRONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW|O_NONBLOCK); |
1310 | if (truncate_fd < 0) { | |
1311 | ||
1312 | /* If this failed because the file doesn't exist propagate the error right-away. Also, | |
1313 | * AT_REMOVEDIR wasn't set, and we tried to open the file for writing, which means EISDIR is | |
1314 | * returned when this is a directory but we are not supposed to delete those, hence propagate | |
1315 | * the error right-away too. */ | |
1316 | if (IN_SET(errno, ENOENT, EISDIR)) | |
1317 | return -errno; | |
1318 | ||
1319 | if (errno != ELOOP) /* don't complain if this is a symlink */ | |
1320 | log_debug_errno(errno, "Failed to open file '%s' for deallocation, ignoring: %m", name); | |
1321 | } | |
1322 | } | |
1323 | ||
053e0626 | 1324 | if (unlinkat(fd, name, FLAGS_SET(flags, UNLINK_REMOVEDIR) ? AT_REMOVEDIR : 0) < 0) |
43767d9d LP |
1325 | return -errno; |
1326 | ||
1327 | if (truncate_fd < 0) /* Don't have a file handle, can't do more ☹️ */ | |
1328 | return 0; | |
1329 | ||
1330 | if (fstat(truncate_fd, &st) < 0) { | |
011723a4 | 1331 | log_debug_errno(errno, "Failed to stat file '%s' for deallocation, ignoring: %m", name); |
43767d9d LP |
1332 | return 0; |
1333 | } | |
1334 | ||
053e0626 LP |
1335 | if (!S_ISREG(st.st_mode)) |
1336 | return 0; | |
1337 | ||
1338 | if (FLAGS_SET(flags, UNLINK_ERASE) && st.st_size > 0 && st.st_nlink == 0) { | |
1339 | uint64_t left = st.st_size; | |
1340 | char buffer[64 * 1024]; | |
1341 | ||
1342 | /* If erasing is requested, let's overwrite the file with random data once before deleting | |
1343 | * it. This isn't going to give you shred(1) semantics, but hopefully should be good enough | |
1344 | * for stuff backed by tmpfs at least. | |
1345 | * | |
15dd4515 | 1346 | * Note that we only erase like this if the link count of the file is zero. If it is higher it |
053e0626 LP |
1347 | * is still linked by someone else and we'll leave it to them to remove it securely |
1348 | * eventually! */ | |
1349 | ||
1350 | random_bytes(buffer, sizeof(buffer)); | |
1351 | ||
1352 | while (left > 0) { | |
1353 | ssize_t n; | |
1354 | ||
1355 | n = write(truncate_fd, buffer, MIN(sizeof(buffer), left)); | |
1356 | if (n < 0) { | |
1357 | log_debug_errno(errno, "Failed to erase data in file '%s', ignoring.", name); | |
1358 | break; | |
1359 | } | |
1360 | ||
1361 | assert(left >= (size_t) n); | |
1362 | left -= n; | |
1363 | } | |
1364 | ||
1365 | /* Let's refresh metadata */ | |
1366 | if (fstat(truncate_fd, &st) < 0) { | |
1367 | log_debug_errno(errno, "Failed to stat file '%s' for deallocation, ignoring: %m", name); | |
1368 | return 0; | |
1369 | } | |
1370 | } | |
1371 | ||
1372 | /* Don't dallocate if there's nothing to deallocate or if the file is linked elsewhere */ | |
1373 | if (st.st_blocks == 0 || st.st_nlink > 0) | |
43767d9d LP |
1374 | return 0; |
1375 | ||
1376 | /* If this is a regular file, it actually took up space on disk and there are no other links it's time to | |
1377 | * punch-hole/truncate this to release the disk space. */ | |
1378 | ||
1379 | bs = MAX(st.st_blksize, 512); | |
1380 | l = DIV_ROUND_UP(st.st_size, bs) * bs; /* Round up to next block size */ | |
1381 | ||
1382 | if (fallocate(truncate_fd, FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE, 0, l) >= 0) | |
1383 | return 0; /* Successfully punched a hole! 😊 */ | |
1384 | ||
1385 | /* Fall back to truncation */ | |
1386 | if (ftruncate(truncate_fd, 0) < 0) { | |
1387 | log_debug_errno(errno, "Failed to truncate file to 0, ignoring: %m"); | |
1388 | return 0; | |
1389 | } | |
1390 | ||
1391 | return 0; | |
1392 | } | |
11b29a96 LP |
1393 | |
1394 | int fsync_directory_of_file(int fd) { | |
0c462ea4 | 1395 | _cleanup_free_ char *path = NULL; |
11b29a96 LP |
1396 | _cleanup_close_ int dfd = -1; |
1397 | int r; | |
1398 | ||
1399 | r = fd_verify_regular(fd); | |
1400 | if (r < 0) | |
1401 | return r; | |
1402 | ||
1403 | r = fd_get_path(fd, &path); | |
3ceae1bc | 1404 | if (r < 0) { |
b8b846d7 LP |
1405 | log_debug_errno(r, "Failed to query /proc/self/fd/%d%s: %m", |
1406 | fd, | |
8fe8f3aa | 1407 | r == -ENOSYS ? ", ignoring" : ""); |
3ceae1bc | 1408 | |
8fe8f3aa | 1409 | if (r == -ENOSYS) |
3ceae1bc ZJS |
1410 | /* If /proc is not available, we're most likely running in some |
1411 | * chroot environment, and syncing the directory is not very | |
1412 | * important in that case. Let's just silently do nothing. */ | |
1413 | return 0; | |
1414 | ||
11b29a96 | 1415 | return r; |
3ceae1bc | 1416 | } |
11b29a96 LP |
1417 | |
1418 | if (!path_is_absolute(path)) | |
1419 | return -EINVAL; | |
1420 | ||
0c462ea4 | 1421 | dfd = open_parent(path, O_CLOEXEC, 0); |
11b29a96 | 1422 | if (dfd < 0) |
0c462ea4 | 1423 | return dfd; |
11b29a96 LP |
1424 | |
1425 | if (fsync(dfd) < 0) | |
1426 | return -errno; | |
1427 | ||
1428 | return 0; | |
1429 | } | |
ef8becfa | 1430 | |
63d59b8d LP |
1431 | int fsync_full(int fd) { |
1432 | int r, q; | |
1433 | ||
1434 | /* Sync both the file and the directory */ | |
1435 | ||
1436 | r = fsync(fd) < 0 ? -errno : 0; | |
1437 | q = fsync_directory_of_file(fd); | |
1438 | ||
1439 | return r < 0 ? r : q; | |
1440 | } | |
1441 | ||
36695e88 LP |
1442 | int fsync_path_at(int at_fd, const char *path) { |
1443 | _cleanup_close_ int opened_fd = -1; | |
1444 | int fd; | |
1445 | ||
1446 | if (isempty(path)) { | |
1447 | if (at_fd == AT_FDCWD) { | |
1448 | opened_fd = open(".", O_RDONLY|O_DIRECTORY|O_CLOEXEC); | |
1449 | if (opened_fd < 0) | |
1450 | return -errno; | |
1451 | ||
1452 | fd = opened_fd; | |
1453 | } else | |
1454 | fd = at_fd; | |
1455 | } else { | |
1456 | ||
1457 | opened_fd = openat(at_fd, path, O_RDONLY|O_CLOEXEC); | |
1458 | if (opened_fd < 0) | |
1459 | return -errno; | |
1460 | ||
1461 | fd = opened_fd; | |
1462 | } | |
1463 | ||
1464 | if (fsync(fd) < 0) | |
1465 | return -errno; | |
1466 | ||
1467 | return 0; | |
1468 | } | |
1469 | ||
71f51416 LP |
1470 | int syncfs_path(int atfd, const char *path) { |
1471 | _cleanup_close_ int fd = -1; | |
1472 | ||
1473 | assert(path); | |
1474 | ||
1475 | fd = openat(atfd, path, O_CLOEXEC|O_RDONLY|O_NONBLOCK); | |
1476 | if (fd < 0) | |
1477 | return -errno; | |
1478 | ||
1479 | if (syncfs(fd) < 0) | |
1480 | return -errno; | |
1481 | ||
1482 | return 0; | |
1483 | } | |
1484 | ||
ef8becfa LP |
1485 | int open_parent(const char *path, int flags, mode_t mode) { |
1486 | _cleanup_free_ char *parent = NULL; | |
1487 | int fd; | |
1488 | ||
1489 | if (isempty(path)) | |
1490 | return -EINVAL; | |
1491 | if (path_equal(path, "/")) /* requesting the parent of the root dir is fishy, let's prohibit that */ | |
1492 | return -EINVAL; | |
1493 | ||
1494 | parent = dirname_malloc(path); | |
1495 | if (!parent) | |
1496 | return -ENOMEM; | |
1497 | ||
1498 | /* Let's insist on O_DIRECTORY since the parent of a file or directory is a directory. Except if we open an | |
1499 | * O_TMPFILE file, because in that case we are actually create a regular file below the parent directory. */ | |
1500 | ||
0c21dafb | 1501 | if (FLAGS_SET(flags, O_PATH)) |
ef8becfa | 1502 | flags |= O_DIRECTORY; |
0c21dafb | 1503 | else if (!FLAGS_SET(flags, O_TMPFILE)) |
ef8becfa LP |
1504 | flags |= O_DIRECTORY|O_RDONLY; |
1505 | ||
1506 | fd = open(parent, flags, mode); | |
1507 | if (fd < 0) | |
1508 | return -errno; | |
1509 | ||
1510 | return fd; | |
1511 | } | |
ed9c0851 | 1512 | |
622e1cdb LP |
1513 | static int blockdev_is_encrypted(const char *sysfs_path, unsigned depth_left) { |
1514 | _cleanup_free_ char *p = NULL, *uuids = NULL; | |
1515 | _cleanup_closedir_ DIR *d = NULL; | |
1516 | int r, found_encrypted = false; | |
1517 | ||
1518 | assert(sysfs_path); | |
1519 | ||
1520 | if (depth_left == 0) | |
1521 | return -EINVAL; | |
1522 | ||
1523 | p = path_join(sysfs_path, "dm/uuid"); | |
1524 | if (!p) | |
1525 | return -ENOMEM; | |
1526 | ||
1527 | r = read_one_line_file(p, &uuids); | |
1528 | if (r != -ENOENT) { | |
1529 | if (r < 0) | |
1530 | return r; | |
1531 | ||
1532 | /* The DM device's uuid attribute is prefixed with "CRYPT-" if this is a dm-crypt device. */ | |
1533 | if (startswith(uuids, "CRYPT-")) | |
1534 | return true; | |
1535 | } | |
1536 | ||
1537 | /* Not a dm-crypt device itself. But maybe it is on top of one? Follow the links in the "slaves/" | |
1538 | * subdir. */ | |
1539 | ||
1540 | p = mfree(p); | |
1541 | p = path_join(sysfs_path, "slaves"); | |
1542 | if (!p) | |
1543 | return -ENOMEM; | |
1544 | ||
1545 | d = opendir(p); | |
1546 | if (!d) { | |
6b000af4 | 1547 | if (errno == ENOENT) /* Doesn't have underlying devices */ |
622e1cdb LP |
1548 | return false; |
1549 | ||
1550 | return -errno; | |
1551 | } | |
1552 | ||
1553 | for (;;) { | |
1554 | _cleanup_free_ char *q = NULL; | |
1555 | struct dirent *de; | |
1556 | ||
1557 | errno = 0; | |
1558 | de = readdir_no_dot(d); | |
1559 | if (!de) { | |
1560 | if (errno != 0) | |
1561 | return -errno; | |
1562 | ||
6b000af4 | 1563 | break; /* No more underlying devices */ |
622e1cdb LP |
1564 | } |
1565 | ||
1566 | q = path_join(p, de->d_name); | |
1567 | if (!q) | |
1568 | return -ENOMEM; | |
1569 | ||
1570 | r = blockdev_is_encrypted(q, depth_left - 1); | |
1571 | if (r < 0) | |
1572 | return r; | |
1573 | if (r == 0) /* we found one that is not encrypted? then propagate that immediately */ | |
1574 | return false; | |
1575 | ||
1576 | found_encrypted = true; | |
1577 | } | |
1578 | ||
1579 | return found_encrypted; | |
1580 | } | |
1581 | ||
ed9c0851 | 1582 | int path_is_encrypted(const char *path) { |
622e1cdb | 1583 | char p[SYS_BLOCK_PATH_MAX(NULL)]; |
ed9c0851 LP |
1584 | dev_t devt; |
1585 | int r; | |
1586 | ||
1587 | r = get_block_device(path, &devt); | |
1588 | if (r < 0) | |
1589 | return r; | |
1590 | if (r == 0) /* doesn't have a block device */ | |
1591 | return false; | |
1592 | ||
622e1cdb | 1593 | xsprintf_sys_block_path(p, NULL, devt); |
ed9c0851 | 1594 | |
622e1cdb | 1595 | return blockdev_is_encrypted(p, 10 /* safety net: maximum recursion depth */); |
ed9c0851 | 1596 | } |