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70a5db58 LP |
1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
2 | ||
3 | #include <stddef.h> | |
4 | #include <sys/mount.h> | |
5 | ||
6 | #include "chown-recursive.h" | |
7 | #include "copy.h" | |
8 | #include "fd-util.h" | |
9 | #include "fileio.h" | |
1dfe5de0 | 10 | #include "fs-util.h" |
70a5db58 LP |
11 | #include "home-util.h" |
12 | #include "homework-cifs.h" | |
13 | #include "homework-directory.h" | |
14 | #include "homework-fscrypt.h" | |
15 | #include "homework-luks.h" | |
16 | #include "homework-mount.h" | |
17 | #include "homework-pkcs11.h" | |
18 | #include "homework.h" | |
19 | #include "main-func.h" | |
20 | #include "memory-util.h" | |
21 | #include "missing_magic.h" | |
22 | #include "mount-util.h" | |
23 | #include "path-util.h" | |
24 | #include "pkcs11-util.h" | |
25 | #include "rm-rf.h" | |
26 | #include "stat-util.h" | |
27 | #include "strv.h" | |
28 | #include "tmpfile-util.h" | |
29 | #include "user-util.h" | |
30 | #include "virt.h" | |
31 | ||
32 | /* Make sure a bad password always results in a 3s delay, no matter what */ | |
33 | #define BAD_PASSWORD_DELAY_USEC (3 * USEC_PER_SEC) | |
34 | ||
35 | int user_record_authenticate( | |
36 | UserRecord *h, | |
37 | UserRecord *secret, | |
38 | char ***pkcs11_decrypted_passwords) { | |
39 | ||
40 | bool need_password = false, need_token = false, need_pin = false, need_protected_authentication_path_permitted = false, | |
41 | pin_locked = false, pin_incorrect = false, pin_incorrect_few_tries_left = false, pin_incorrect_one_try_left = false; | |
70a5db58 LP |
42 | int r; |
43 | ||
44 | assert(h); | |
45 | assert(secret); | |
46 | ||
47 | /* Tries to authenticate a user record with the supplied secrets. i.e. checks whether at least one | |
48 | * supplied plaintext passwords matches a hashed password field of the user record. Or if a | |
49 | * configured PKCS#11 token is around and can unlock the record. | |
50 | * | |
51 | * Note that the pkcs11_decrypted_passwords parameter is both an input and and output parameter: it | |
52 | * is a list of configured, decrypted PKCS#11 passwords. We typically have to call this function | |
53 | * multiple times over the course of an operation (think: on login we authenticate the host user | |
54 | * record, the record embedded in the LUKS record and the one embedded in $HOME). Hence we keep a | |
55 | * list of passwords we already decrypted, so that we don't have to do the (slow an potentially | |
56 | * interactive) PKCS#11 dance for the relevant token again and again. */ | |
57 | ||
58 | /* First, let's see if the supplied plain-text passwords work? */ | |
59 | r = user_record_test_secret(h, secret); | |
60 | if (r == -ENOKEY) { | |
61 | log_info_errno(r, "None of the supplied plaintext passwords unlocks the user record's hashed passwords."); | |
62 | need_password = true; | |
63 | } else if (r == -ENXIO) | |
64 | log_debug_errno(r, "User record has no hashed passwords, plaintext passwords not tested."); | |
65 | else if (r < 0) | |
66 | return log_error_errno(r, "Failed to validate password of record: %m"); | |
67 | else { | |
68 | log_info("Provided password unlocks user record."); | |
69 | return 0; | |
70 | } | |
71 | ||
72 | /* Second, let's see if any of the PKCS#11 security tokens are plugged in and help us */ | |
3aeea37d | 73 | for (size_t n = 0; n < h->n_pkcs11_encrypted_key; n++) { |
70a5db58 LP |
74 | #if HAVE_P11KIT |
75 | _cleanup_(pkcs11_callback_data_release) struct pkcs11_callback_data data = { | |
76 | .user_record = h, | |
77 | .secret = secret, | |
78 | .encrypted_key = h->pkcs11_encrypted_key + n, | |
79 | }; | |
80 | char **pp; | |
81 | ||
82 | /* See if any of the previously calculated passwords work */ | |
83 | STRV_FOREACH(pp, *pkcs11_decrypted_passwords) { | |
84 | r = test_password_one(data.encrypted_key->hashed_password, *pp); | |
85 | if (r < 0) | |
86 | return log_error_errno(r, "Failed to check supplied PKCS#11 password: %m"); | |
87 | if (r > 0) { | |
88 | log_info("Previously acquired PKCS#11 password unlocks user record."); | |
89 | return 0; | |
90 | } | |
91 | } | |
92 | ||
93 | r = pkcs11_find_token(data.encrypted_key->uri, pkcs11_callback, &data); | |
94 | switch (r) { | |
95 | case -EAGAIN: | |
96 | need_token = true; | |
97 | break; | |
98 | case -ENOANO: | |
99 | need_pin = true; | |
100 | break; | |
101 | case -ERFKILL: | |
102 | need_protected_authentication_path_permitted = true; | |
103 | break; | |
104 | case -EOWNERDEAD: | |
105 | pin_locked = true; | |
106 | break; | |
107 | case -ENOLCK: | |
108 | pin_incorrect = true; | |
109 | break; | |
110 | case -ETOOMANYREFS: | |
111 | pin_incorrect = pin_incorrect_few_tries_left = true; | |
112 | break; | |
113 | case -EUCLEAN: | |
114 | pin_incorrect = pin_incorrect_few_tries_left = pin_incorrect_one_try_left = true; | |
115 | break; | |
116 | default: | |
117 | if (r < 0) | |
118 | return r; | |
119 | ||
120 | r = test_password_one(data.encrypted_key->hashed_password, data.decrypted_password); | |
121 | if (r < 0) | |
122 | return log_error_errno(r, "Failed to test PKCS#11 password: %m"); | |
123 | if (r == 0) | |
124 | return log_error_errno(SYNTHETIC_ERRNO(EPERM), "Configured PKCS#11 security token %s does not decrypt encrypted key correctly.", data.encrypted_key->uri); | |
125 | ||
126 | log_info("Decrypted password from PKCS#11 security token %s unlocks user record.", data.encrypted_key->uri); | |
127 | ||
128 | r = strv_extend(pkcs11_decrypted_passwords, data.decrypted_password); | |
129 | if (r < 0) | |
130 | return log_oom(); | |
131 | ||
132 | return 0; | |
133 | } | |
134 | #else | |
135 | need_token = true; | |
136 | break; | |
137 | #endif | |
138 | } | |
139 | ||
140 | /* Ordered by "relevance", i.e. the most "important" or "interesting" error condition is returned. */ | |
141 | if (pin_incorrect_one_try_left) | |
142 | return -EUCLEAN; | |
143 | if (pin_incorrect_few_tries_left) | |
144 | return -ETOOMANYREFS; | |
145 | if (pin_incorrect) | |
146 | return -ENOLCK; | |
147 | if (pin_locked) | |
148 | return -EOWNERDEAD; | |
149 | if (need_protected_authentication_path_permitted) | |
150 | return -ERFKILL; | |
151 | if (need_pin) | |
152 | return -ENOANO; | |
153 | if (need_token) | |
154 | return -EBADSLT; | |
155 | if (need_password) | |
156 | return -ENOKEY; | |
157 | ||
158 | /* Hmm, this means neither PCKS#11 nor classic hashed passwords were supplied, we cannot authenticate this reasonably */ | |
159 | return log_debug_errno(SYNTHETIC_ERRNO(EKEYREVOKED), "No hashed passwords and no PKCS#11 tokens defined, cannot authenticate user record."); | |
160 | } | |
161 | ||
162 | int home_setup_undo(HomeSetup *setup) { | |
163 | int r = 0, q; | |
164 | ||
165 | assert(setup); | |
166 | ||
28a7f106 LP |
167 | if (setup->root_fd >= 0) { |
168 | if (setup->do_offline_fitrim) { | |
169 | q = run_fitrim(setup->root_fd); | |
170 | if (q < 0) | |
171 | r = q; | |
172 | } | |
173 | ||
174 | setup->root_fd = safe_close(setup->root_fd); | |
175 | } | |
70a5db58 LP |
176 | |
177 | if (setup->undo_mount) { | |
178 | q = umount_verbose("/run/systemd/user-home-mount"); | |
179 | if (q < 0) | |
180 | r = q; | |
181 | } | |
182 | ||
183 | if (setup->undo_dm && setup->crypt_device && setup->dm_name) { | |
184 | q = crypt_deactivate(setup->crypt_device, setup->dm_name); | |
185 | if (q < 0) | |
186 | r = q; | |
187 | } | |
188 | ||
28a7f106 LP |
189 | if (setup->image_fd >= 0) { |
190 | if (setup->do_offline_fallocate) { | |
191 | q = run_fallocate(setup->image_fd, NULL); | |
192 | if (q < 0) | |
193 | r = q; | |
194 | } | |
195 | ||
196 | setup->image_fd = safe_close(setup->image_fd); | |
197 | } | |
198 | ||
70a5db58 LP |
199 | setup->undo_mount = false; |
200 | setup->undo_dm = false; | |
28a7f106 LP |
201 | setup->do_offline_fitrim = false; |
202 | setup->do_offline_fallocate = false; | |
70a5db58 LP |
203 | |
204 | setup->dm_name = mfree(setup->dm_name); | |
205 | setup->dm_node = mfree(setup->dm_node); | |
206 | ||
207 | setup->loop = loop_device_unref(setup->loop); | |
208 | crypt_free(setup->crypt_device); | |
209 | setup->crypt_device = NULL; | |
210 | ||
211 | explicit_bzero_safe(setup->volume_key, setup->volume_key_size); | |
212 | setup->volume_key = mfree(setup->volume_key); | |
213 | setup->volume_key_size = 0; | |
214 | ||
215 | return r; | |
216 | } | |
217 | ||
218 | int home_prepare( | |
219 | UserRecord *h, | |
220 | bool already_activated, | |
221 | char ***pkcs11_decrypted_passwords, | |
222 | HomeSetup *setup, | |
223 | UserRecord **ret_header_home) { | |
224 | ||
225 | int r; | |
226 | ||
227 | assert(h); | |
228 | assert(setup); | |
229 | assert(!setup->loop); | |
230 | assert(!setup->crypt_device); | |
231 | assert(setup->root_fd < 0); | |
232 | assert(!setup->undo_dm); | |
233 | assert(!setup->undo_mount); | |
234 | ||
235 | /* Makes a home directory accessible (through the root_fd file descriptor, not by path!). */ | |
236 | ||
237 | switch (user_record_storage(h)) { | |
238 | ||
239 | case USER_LUKS: | |
240 | return home_prepare_luks(h, already_activated, NULL, pkcs11_decrypted_passwords, setup, ret_header_home); | |
241 | ||
242 | case USER_SUBVOLUME: | |
243 | case USER_DIRECTORY: | |
244 | r = home_prepare_directory(h, already_activated, setup); | |
245 | break; | |
246 | ||
247 | case USER_FSCRYPT: | |
248 | r = home_prepare_fscrypt(h, already_activated, pkcs11_decrypted_passwords, setup); | |
249 | break; | |
250 | ||
251 | case USER_CIFS: | |
252 | r = home_prepare_cifs(h, already_activated, setup); | |
253 | break; | |
254 | ||
255 | default: | |
256 | return log_error_errno(SYNTHETIC_ERRNO(ENOLINK), "Processing home directories of type '%s' currently not supported.", user_storage_to_string(user_record_storage(h))); | |
257 | } | |
258 | ||
259 | if (r < 0) | |
260 | return r; | |
261 | ||
262 | if (ret_header_home) | |
263 | *ret_header_home = NULL; | |
264 | ||
265 | return r; | |
266 | } | |
267 | ||
268 | int home_sync_and_statfs(int root_fd, struct statfs *ret) { | |
269 | assert(root_fd >= 0); | |
270 | ||
271 | /* Let's sync this to disk, so that the disk space reported by fstatfs() below is accurate (for file | |
272 | * systems such as btrfs where this is determined lazily). */ | |
273 | ||
274 | if (syncfs(root_fd) < 0) | |
275 | return log_error_errno(errno, "Failed to synchronize file system: %m"); | |
276 | ||
277 | if (ret) | |
278 | if (fstatfs(root_fd, ret) < 0) | |
279 | return log_error_errno(errno, "Failed to statfs() file system: %m"); | |
280 | ||
281 | log_info("Synchronized disk."); | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
286 | static int read_identity_file(int root_fd, JsonVariant **ret) { | |
287 | _cleanup_(fclosep) FILE *identity_file = NULL; | |
288 | _cleanup_close_ int identity_fd = -1; | |
289 | unsigned line, column; | |
290 | int r; | |
291 | ||
292 | assert(root_fd >= 0); | |
293 | assert(ret); | |
294 | ||
295 | identity_fd = openat(root_fd, ".identity", O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW|O_NONBLOCK); | |
296 | if (identity_fd < 0) | |
297 | return log_error_errno(errno, "Failed to open .identity file in home directory: %m"); | |
298 | ||
299 | r = fd_verify_regular(identity_fd); | |
300 | if (r < 0) | |
301 | return log_error_errno(r, "Embedded identity file is not a regular file, refusing: %m"); | |
302 | ||
4fa744a3 | 303 | identity_file = take_fdopen(&identity_fd, "r"); |
70a5db58 LP |
304 | if (!identity_file) |
305 | return log_oom(); | |
306 | ||
70a5db58 LP |
307 | r = json_parse_file(identity_file, ".identity", JSON_PARSE_SENSITIVE, ret, &line, &column); |
308 | if (r < 0) | |
309 | return log_error_errno(r, "[.identity:%u:%u] Failed to parse JSON data: %m", line, column); | |
310 | ||
311 | log_info("Read embedded .identity file."); | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
316 | static int write_identity_file(int root_fd, JsonVariant *v, uid_t uid) { | |
317 | _cleanup_(json_variant_unrefp) JsonVariant *normalized = NULL; | |
318 | _cleanup_(fclosep) FILE *identity_file = NULL; | |
319 | _cleanup_close_ int identity_fd = -1; | |
320 | _cleanup_free_ char *fn = NULL; | |
321 | int r; | |
322 | ||
323 | assert(root_fd >= 0); | |
324 | assert(v); | |
325 | ||
326 | normalized = json_variant_ref(v); | |
327 | ||
328 | r = json_variant_normalize(&normalized); | |
329 | if (r < 0) | |
330 | log_warning_errno(r, "Failed to normalize user record, ignoring: %m"); | |
331 | ||
332 | r = tempfn_random(".identity", NULL, &fn); | |
333 | if (r < 0) | |
334 | return r; | |
335 | ||
336 | identity_fd = openat(root_fd, fn, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0600); | |
337 | if (identity_fd < 0) | |
338 | return log_error_errno(errno, "Failed to create .identity file in home directory: %m"); | |
339 | ||
4fa744a3 | 340 | identity_file = take_fdopen(&identity_fd, "w"); |
70a5db58 LP |
341 | if (!identity_file) { |
342 | r = log_oom(); | |
343 | goto fail; | |
344 | } | |
345 | ||
70a5db58 LP |
346 | json_variant_dump(normalized, JSON_FORMAT_PRETTY, identity_file, NULL); |
347 | ||
348 | r = fflush_and_check(identity_file); | |
349 | if (r < 0) { | |
350 | log_error_errno(r, "Failed to write .identity file: %m"); | |
351 | goto fail; | |
352 | } | |
353 | ||
354 | if (fchown(fileno(identity_file), uid, uid) < 0) { | |
355 | log_error_errno(r, "Failed to change ownership of identity file: %m"); | |
356 | goto fail; | |
357 | } | |
358 | ||
359 | if (renameat(root_fd, fn, root_fd, ".identity") < 0) { | |
360 | r = log_error_errno(errno, "Failed to move identity file into place: %m"); | |
361 | goto fail; | |
362 | } | |
363 | ||
364 | log_info("Wrote embedded .identity file."); | |
365 | ||
366 | return 0; | |
367 | ||
368 | fail: | |
369 | (void) unlinkat(root_fd, fn, 0); | |
370 | return r; | |
371 | } | |
372 | ||
373 | int home_load_embedded_identity( | |
374 | UserRecord *h, | |
375 | int root_fd, | |
376 | UserRecord *header_home, | |
377 | UserReconcileMode mode, | |
378 | char ***pkcs11_decrypted_passwords, | |
379 | UserRecord **ret_embedded_home, | |
380 | UserRecord **ret_new_home) { | |
381 | ||
382 | _cleanup_(user_record_unrefp) UserRecord *embedded_home = NULL, *intermediate_home = NULL, *new_home = NULL; | |
383 | _cleanup_(json_variant_unrefp) JsonVariant *v = NULL; | |
384 | int r; | |
385 | ||
386 | assert(h); | |
387 | assert(root_fd >= 0); | |
388 | ||
389 | r = read_identity_file(root_fd, &v); | |
390 | if (r < 0) | |
391 | return r; | |
392 | ||
393 | embedded_home = user_record_new(); | |
394 | if (!embedded_home) | |
395 | return log_oom(); | |
396 | ||
397 | r = user_record_load(embedded_home, v, USER_RECORD_LOAD_EMBEDDED); | |
398 | if (r < 0) | |
399 | return r; | |
400 | ||
401 | if (!user_record_compatible(h, embedded_home)) | |
80ace4f2 | 402 | return log_error_errno(SYNTHETIC_ERRNO(EREMCHG), "Embedded home record not compatible with host record, refusing."); |
70a5db58 LP |
403 | |
404 | /* Insist that credentials the user supplies also unlocks any embedded records. */ | |
405 | r = user_record_authenticate(embedded_home, h, pkcs11_decrypted_passwords); | |
406 | if (r < 0) | |
407 | return r; | |
408 | ||
409 | /* At this point we have three records to deal with: | |
410 | * | |
411 | * · The record we got passed from the host | |
412 | * · The record included in the LUKS header (only if LUKS is used) | |
413 | * · The record in the home directory itself (~.identity) | |
414 | * | |
415 | * Now we have to reconcile all three, and let the newest one win. */ | |
416 | ||
417 | if (header_home) { | |
418 | /* Note we relax the requirements here. Instead of insisting that the host record is strictly | |
419 | * newer, let's also be OK if its equally new. If it is, we'll however insist that the | |
420 | * embedded record must be newer, so that we update at least one of the two. */ | |
421 | ||
422 | r = user_record_reconcile(h, header_home, mode == USER_RECONCILE_REQUIRE_NEWER ? USER_RECONCILE_REQUIRE_NEWER_OR_EQUAL : mode, &intermediate_home); | |
423 | if (r == -EREMCHG) /* this was supposed to be checked earlier already, but let's check this again */ | |
424 | return log_error_errno(r, "Identity stored on host and in header don't match, refusing."); | |
425 | if (r == -ESTALE) | |
426 | return log_error_errno(r, "Embedded identity record is newer than supplied record, refusing."); | |
427 | if (r < 0) | |
428 | return log_error_errno(r, "Failed to reconcile host and header identities: %m"); | |
429 | if (r == USER_RECONCILE_EMBEDDED_WON) | |
430 | log_info("Reconciling header user identity completed (header version was newer)."); | |
431 | else if (r == USER_RECONCILE_HOST_WON) { | |
432 | log_info("Reconciling header user identity completed (host version was newer)."); | |
433 | ||
434 | if (mode == USER_RECONCILE_REQUIRE_NEWER) /* Host version is newer than the header | |
435 | * version, hence we'll update | |
436 | * something. This means we can relax the | |
437 | * requirements on the embedded | |
438 | * identity. */ | |
439 | mode = USER_RECONCILE_REQUIRE_NEWER_OR_EQUAL; | |
440 | } else { | |
441 | assert(r == USER_RECONCILE_IDENTICAL); | |
442 | log_info("Reconciling user identities completed (host and header version were identical)."); | |
443 | } | |
444 | ||
445 | h = intermediate_home; | |
446 | } | |
447 | ||
448 | r = user_record_reconcile(h, embedded_home, mode, &new_home); | |
449 | if (r == -EREMCHG) | |
450 | return log_error_errno(r, "Identity stored on host and in home don't match, refusing."); | |
451 | if (r == -ESTALE) | |
452 | return log_error_errno(r, "Embedded identity record is equally new or newer than supplied record, refusing."); | |
453 | if (r < 0) | |
454 | return log_error_errno(r, "Failed to reconcile host and embedded identities: %m"); | |
455 | if (r == USER_RECONCILE_EMBEDDED_WON) | |
456 | log_info("Reconciling embedded user identity completed (embedded version was newer)."); | |
457 | else if (r == USER_RECONCILE_HOST_WON) | |
458 | log_info("Reconciling embedded user identity completed (host version was newer)."); | |
459 | else { | |
460 | assert(r == USER_RECONCILE_IDENTICAL); | |
461 | log_info("Reconciling embedded user identity completed (host and embedded version were identical)."); | |
462 | } | |
463 | ||
464 | if (ret_embedded_home) | |
465 | *ret_embedded_home = TAKE_PTR(embedded_home); | |
466 | ||
467 | if (ret_new_home) | |
468 | *ret_new_home = TAKE_PTR(new_home); | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
473 | int home_store_embedded_identity(UserRecord *h, int root_fd, uid_t uid, UserRecord *old_home) { | |
474 | _cleanup_(user_record_unrefp) UserRecord *embedded = NULL; | |
475 | int r; | |
476 | ||
477 | assert(h); | |
478 | assert(root_fd >= 0); | |
479 | assert(uid_is_valid(uid)); | |
480 | ||
481 | r = user_record_clone(h, USER_RECORD_EXTRACT_EMBEDDED, &embedded); | |
482 | if (r < 0) | |
483 | return log_error_errno(r, "Failed to determine new embedded record: %m"); | |
484 | ||
485 | if (old_home && user_record_equal(old_home, embedded)) { | |
486 | log_debug("Not updating embedded home record."); | |
487 | return 0; | |
488 | } | |
489 | ||
490 | /* The identity has changed, let's update it in the image */ | |
491 | r = write_identity_file(root_fd, embedded->json, h->uid); | |
492 | if (r < 0) | |
493 | return r; | |
494 | ||
495 | return 1; | |
496 | } | |
497 | ||
498 | static const char *file_system_type_fd(int fd) { | |
499 | struct statfs sfs; | |
500 | ||
501 | assert(fd >= 0); | |
502 | ||
503 | if (fstatfs(fd, &sfs) < 0) { | |
504 | log_debug_errno(errno, "Failed to statfs(): %m"); | |
505 | return NULL; | |
506 | } | |
507 | ||
508 | if (is_fs_type(&sfs, XFS_SB_MAGIC)) | |
509 | return "xfs"; | |
510 | if (is_fs_type(&sfs, EXT4_SUPER_MAGIC)) | |
511 | return "ext4"; | |
512 | if (is_fs_type(&sfs, BTRFS_SUPER_MAGIC)) | |
513 | return "btrfs"; | |
514 | ||
515 | return NULL; | |
516 | } | |
517 | ||
518 | int home_extend_embedded_identity(UserRecord *h, UserRecord *used, HomeSetup *setup) { | |
519 | int r; | |
520 | ||
521 | assert(h); | |
522 | assert(used); | |
523 | assert(setup); | |
524 | ||
525 | r = user_record_add_binding( | |
526 | h, | |
527 | user_record_storage(used), | |
528 | user_record_image_path(used), | |
529 | setup->found_partition_uuid, | |
530 | setup->found_luks_uuid, | |
531 | setup->found_fs_uuid, | |
532 | setup->crypt_device ? crypt_get_cipher(setup->crypt_device) : NULL, | |
533 | setup->crypt_device ? crypt_get_cipher_mode(setup->crypt_device) : NULL, | |
534 | setup->crypt_device ? luks_volume_key_size_convert(setup->crypt_device) : UINT64_MAX, | |
535 | file_system_type_fd(setup->root_fd), | |
536 | user_record_home_directory(used), | |
537 | used->uid, | |
538 | (gid_t) used->uid); | |
539 | if (r < 0) | |
540 | return log_error_errno(r, "Failed to update binding in record: %m"); | |
541 | ||
542 | return 0; | |
543 | } | |
544 | ||
545 | static int chown_recursive_directory(int root_fd, uid_t uid) { | |
546 | int r; | |
547 | ||
548 | assert(root_fd >= 0); | |
549 | assert(uid_is_valid(uid)); | |
550 | ||
551 | r = fd_chown_recursive(root_fd, uid, (gid_t) uid, 0777); | |
552 | if (r < 0) | |
553 | return log_error_errno(r, "Failed to change ownership of files and directories: %m"); | |
554 | if (r == 0) | |
555 | log_info("Recursive changing of ownership not necessary, skipped."); | |
556 | else | |
557 | log_info("Recursive changing of ownership completed."); | |
558 | ||
559 | return 0; | |
560 | } | |
561 | ||
562 | int home_refresh( | |
563 | UserRecord *h, | |
564 | HomeSetup *setup, | |
565 | UserRecord *header_home, | |
566 | char ***pkcs11_decrypted_passwords, | |
567 | struct statfs *ret_statfs, | |
568 | UserRecord **ret_new_home) { | |
569 | ||
570 | _cleanup_(user_record_unrefp) UserRecord *embedded_home = NULL, *new_home = NULL; | |
571 | int r; | |
572 | ||
573 | assert(h); | |
574 | assert(setup); | |
575 | assert(ret_new_home); | |
576 | ||
577 | /* When activating a home directory, does the identity work: loads the identity from the $HOME | |
578 | * directory, reconciles it with our idea, chown()s everything. */ | |
579 | ||
580 | r = home_load_embedded_identity(h, setup->root_fd, header_home, USER_RECONCILE_ANY, pkcs11_decrypted_passwords, &embedded_home, &new_home); | |
581 | if (r < 0) | |
582 | return r; | |
583 | ||
584 | r = home_store_header_identity_luks(new_home, setup, header_home); | |
585 | if (r < 0) | |
586 | return r; | |
587 | ||
588 | r = home_store_embedded_identity(new_home, setup->root_fd, h->uid, embedded_home); | |
589 | if (r < 0) | |
590 | return r; | |
591 | ||
592 | r = chown_recursive_directory(setup->root_fd, h->uid); | |
593 | if (r < 0) | |
594 | return r; | |
595 | ||
596 | r = home_sync_and_statfs(setup->root_fd, ret_statfs); | |
597 | if (r < 0) | |
598 | return r; | |
599 | ||
600 | *ret_new_home = TAKE_PTR(new_home); | |
601 | return 0; | |
602 | } | |
603 | ||
604 | static int home_activate(UserRecord *h, UserRecord **ret_home) { | |
605 | _cleanup_(strv_free_erasep) char **pkcs11_decrypted_passwords = NULL; | |
606 | _cleanup_(user_record_unrefp) UserRecord *new_home = NULL; | |
607 | int r; | |
608 | ||
609 | assert(h); | |
610 | ||
611 | if (!h->user_name) | |
612 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record lacks user name, refusing."); | |
613 | if (!uid_is_valid(h->uid)) | |
614 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record lacks UID, refusing."); | |
615 | if (!IN_SET(user_record_storage(h), USER_LUKS, USER_DIRECTORY, USER_SUBVOLUME, USER_FSCRYPT, USER_CIFS)) | |
616 | return log_error_errno(SYNTHETIC_ERRNO(ENOTTY), "Activating home directories of type '%s' currently not supported.", user_storage_to_string(user_record_storage(h))); | |
617 | ||
618 | r = user_record_authenticate(h, h, &pkcs11_decrypted_passwords); | |
619 | if (r < 0) | |
620 | return r; | |
621 | ||
622 | r = user_record_test_home_directory_and_warn(h); | |
623 | if (r < 0) | |
624 | return r; | |
625 | if (r == USER_TEST_MOUNTED) | |
626 | return log_error_errno(SYNTHETIC_ERRNO(EALREADY), "Home directory %s is already mounted, refusing.", user_record_home_directory(h)); | |
627 | ||
628 | r = user_record_test_image_path_and_warn(h); | |
629 | if (r < 0) | |
630 | return r; | |
631 | if (r == USER_TEST_ABSENT) | |
632 | return log_error_errno(SYNTHETIC_ERRNO(ENOENT), "Image path %s is missing, refusing.", user_record_image_path(h)); | |
633 | ||
634 | switch (user_record_storage(h)) { | |
635 | ||
636 | case USER_LUKS: | |
637 | r = home_activate_luks(h, &pkcs11_decrypted_passwords, &new_home); | |
638 | if (r < 0) | |
639 | return r; | |
640 | ||
641 | break; | |
642 | ||
643 | case USER_SUBVOLUME: | |
644 | case USER_DIRECTORY: | |
645 | case USER_FSCRYPT: | |
646 | r = home_activate_directory(h, &pkcs11_decrypted_passwords, &new_home); | |
647 | if (r < 0) | |
648 | return r; | |
649 | ||
650 | break; | |
651 | ||
652 | case USER_CIFS: | |
653 | r = home_activate_cifs(h, &pkcs11_decrypted_passwords, &new_home); | |
654 | if (r < 0) | |
655 | return r; | |
656 | ||
657 | break; | |
658 | ||
659 | default: | |
660 | assert_not_reached("unexpected type"); | |
661 | } | |
662 | ||
663 | /* Note that the returned object might either be a reference to an updated version of the existing | |
664 | * home object, or a reference to a newly allocated home object. The caller has to be able to deal | |
665 | * with both, and consider the old object out-of-date. */ | |
666 | if (user_record_equal(h, new_home)) { | |
667 | *ret_home = NULL; | |
668 | return 0; /* no identity change */ | |
669 | } | |
670 | ||
671 | *ret_home = TAKE_PTR(new_home); | |
672 | return 1; /* identity updated */ | |
673 | } | |
674 | ||
675 | static int home_deactivate(UserRecord *h, bool force) { | |
676 | bool done = false; | |
677 | int r; | |
678 | ||
679 | assert(h); | |
680 | ||
681 | if (!h->user_name) | |
682 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record incomplete, refusing."); | |
683 | if (!IN_SET(user_record_storage(h), USER_LUKS, USER_DIRECTORY, USER_SUBVOLUME, USER_FSCRYPT, USER_CIFS)) | |
684 | return log_error_errno(SYNTHETIC_ERRNO(ENOTTY), "Deactivating home directories of type '%s' currently not supported.", user_storage_to_string(user_record_storage(h))); | |
685 | ||
686 | r = user_record_test_home_directory_and_warn(h); | |
687 | if (r < 0) | |
688 | return r; | |
689 | if (r == USER_TEST_MOUNTED) { | |
28a7f106 LP |
690 | if (user_record_storage(h) == USER_LUKS) { |
691 | r = home_trim_luks(h); | |
692 | if (r < 0) | |
693 | return r; | |
694 | } | |
695 | ||
70a5db58 LP |
696 | if (umount2(user_record_home_directory(h), UMOUNT_NOFOLLOW | (force ? MNT_FORCE|MNT_DETACH : 0)) < 0) |
697 | return log_error_errno(errno, "Failed to unmount %s: %m", user_record_home_directory(h)); | |
698 | ||
699 | log_info("Unmounting completed."); | |
700 | done = true; | |
701 | } else | |
702 | log_info("Directory %s is already unmounted.", user_record_home_directory(h)); | |
703 | ||
704 | if (user_record_storage(h) == USER_LUKS) { | |
705 | r = home_deactivate_luks(h); | |
706 | if (r < 0) | |
707 | return r; | |
708 | if (r > 0) | |
709 | done = true; | |
710 | } | |
711 | ||
712 | if (!done) | |
713 | return log_error_errno(SYNTHETIC_ERRNO(ENOEXEC), "Home is not active."); | |
714 | ||
715 | log_info("Everything completed."); | |
716 | return 0; | |
717 | } | |
718 | ||
719 | static int copy_skel(int root_fd, const char *skel) { | |
720 | int r; | |
721 | ||
722 | assert(root_fd >= 0); | |
723 | ||
724 | r = copy_tree_at(AT_FDCWD, skel, root_fd, ".", UID_INVALID, GID_INVALID, COPY_MERGE|COPY_REPLACE); | |
725 | if (r == -ENOENT) { | |
726 | log_info("Skeleton directory %s missing, ignoring.", skel); | |
727 | return 0; | |
728 | } | |
729 | if (r < 0) | |
730 | return log_error_errno(r, "Failed to copy in %s: %m", skel); | |
731 | ||
732 | log_info("Copying in %s completed.", skel); | |
733 | return 0; | |
734 | } | |
735 | ||
736 | static int change_access_mode(int root_fd, mode_t m) { | |
737 | assert(root_fd >= 0); | |
738 | ||
739 | if (fchmod(root_fd, m) < 0) | |
740 | return log_error_errno(errno, "Failed to change access mode of top-level directory: %m"); | |
741 | ||
742 | log_info("Changed top-level directory access mode to 0%o.", m); | |
743 | return 0; | |
744 | } | |
745 | ||
746 | int home_populate(UserRecord *h, int dir_fd) { | |
747 | int r; | |
748 | ||
749 | assert(h); | |
750 | assert(dir_fd >= 0); | |
751 | ||
752 | r = copy_skel(dir_fd, user_record_skeleton_directory(h)); | |
753 | if (r < 0) | |
754 | return r; | |
755 | ||
756 | r = home_store_embedded_identity(h, dir_fd, h->uid, NULL); | |
757 | if (r < 0) | |
758 | return r; | |
759 | ||
760 | r = chown_recursive_directory(dir_fd, h->uid); | |
761 | if (r < 0) | |
762 | return r; | |
763 | ||
764 | r = change_access_mode(dir_fd, user_record_access_mode(h)); | |
765 | if (r < 0) | |
766 | return r; | |
767 | ||
768 | return 0; | |
769 | } | |
770 | ||
771 | static int user_record_compile_effective_passwords( | |
772 | UserRecord *h, | |
773 | char ***ret_effective_passwords, | |
774 | char ***ret_pkcs11_decrypted_passwords) { | |
775 | ||
776 | _cleanup_(strv_free_erasep) char **effective = NULL, **pkcs11_passwords = NULL; | |
777 | size_t n; | |
778 | char **i; | |
779 | int r; | |
780 | ||
781 | assert(h); | |
782 | ||
783 | /* We insist on at least one classic hashed password to be defined in addition to any PKCS#11 one, as | |
784 | * a safe fallback, but also to simplify the password changing algorithm: there we require providing | |
785 | * the old literal password only (and do not care for the old PKCS#11 token) */ | |
786 | ||
787 | if (strv_isempty(h->hashed_password)) | |
788 | return log_error_errno(EINVAL, "User record has no hashed passwords, refusing."); | |
789 | ||
790 | /* Generates the list of plaintext passwords to propagate to LUKS/fscrypt devices, and checks whether | |
791 | * we have a plaintext password for each hashed one. If we are missing one we'll fail, since we | |
792 | * couldn't sync fscrypt/LUKS to the login account properly. */ | |
793 | ||
794 | STRV_FOREACH(i, h->hashed_password) { | |
795 | bool found = false; | |
796 | char **j; | |
797 | ||
798 | log_debug("Looking for plaintext password for: %s", *i); | |
799 | ||
800 | /* Let's scan all provided plaintext passwords */ | |
801 | STRV_FOREACH(j, h->password) { | |
802 | r = test_password_one(*i, *j); | |
803 | if (r < 0) | |
804 | return log_error_errno(r, "Failed to test plain text password: %m"); | |
805 | if (r > 0) { | |
806 | if (ret_effective_passwords) { | |
807 | r = strv_extend(&effective, *j); | |
808 | if (r < 0) | |
809 | return log_oom(); | |
810 | } | |
811 | ||
812 | log_debug("Found literal plaintext password."); | |
813 | found = true; | |
814 | break; | |
815 | } | |
816 | } | |
817 | ||
818 | if (!found) | |
819 | return log_error_errno(SYNTHETIC_ERRNO(ENOKEY), "Missing plaintext password for defined hashed password"); | |
820 | } | |
821 | ||
822 | for (n = 0; n < h->n_pkcs11_encrypted_key; n++) { | |
823 | #if HAVE_P11KIT | |
824 | _cleanup_(pkcs11_callback_data_release) struct pkcs11_callback_data data = { | |
825 | .user_record = h, | |
826 | .secret = h, | |
827 | .encrypted_key = h->pkcs11_encrypted_key + n, | |
828 | }; | |
829 | ||
830 | r = pkcs11_find_token(data.encrypted_key->uri, pkcs11_callback, &data); | |
831 | if (r == -EAGAIN) | |
832 | return -EBADSLT; | |
833 | if (r < 0) | |
834 | return r; | |
835 | ||
836 | r = test_password_one(data.encrypted_key->hashed_password, data.decrypted_password); | |
837 | if (r < 0) | |
838 | return log_error_errno(r, "Failed to test PKCS#11 password: %m"); | |
839 | if (r == 0) | |
840 | return log_error_errno(SYNTHETIC_ERRNO(EPERM), "Decrypted password from token is not correct, refusing."); | |
841 | ||
842 | if (ret_effective_passwords) { | |
843 | r = strv_extend(&effective, data.decrypted_password); | |
844 | if (r < 0) | |
845 | return log_oom(); | |
846 | } | |
847 | ||
848 | if (ret_pkcs11_decrypted_passwords) { | |
849 | r = strv_extend(&pkcs11_passwords, data.decrypted_password); | |
850 | if (r < 0) | |
851 | return log_oom(); | |
852 | } | |
853 | #else | |
854 | return -EBADSLT; | |
855 | #endif | |
856 | } | |
857 | ||
858 | if (ret_effective_passwords) | |
859 | *ret_effective_passwords = TAKE_PTR(effective); | |
860 | if (ret_pkcs11_decrypted_passwords) | |
861 | *ret_pkcs11_decrypted_passwords = TAKE_PTR(pkcs11_passwords); | |
862 | ||
863 | return 0; | |
864 | } | |
865 | ||
1dfe5de0 LP |
866 | static int determine_default_storage(UserStorage *ret) { |
867 | UserStorage storage = _USER_STORAGE_INVALID; | |
868 | const char *e; | |
869 | int r; | |
870 | ||
871 | assert(ret); | |
872 | ||
873 | /* homed tells us via an environment variable which default storage to use */ | |
874 | e = getenv("SYSTEMD_HOME_DEFAULT_STORAGE"); | |
875 | if (e) { | |
876 | storage = user_storage_from_string(e); | |
877 | if (storage < 0) | |
878 | log_warning("$SYSTEMD_HOME_DEFAULT_STORAGE set to invalid storage type, ignoring: %s", e); | |
879 | else { | |
880 | log_info("Using configured default storage '%s'.", user_storage_to_string(storage)); | |
881 | *ret = storage; | |
882 | return 0; | |
883 | } | |
884 | } | |
885 | ||
886 | /* When neither user nor admin specified the storage type to use, fix it to be LUKS — unless we run | |
887 | * in a container where loopback devices and LUKS/DM are not available. Also, if /home is encrypted | |
888 | * anyway, let's avoid duplicate encryption. Note that we typically default to the assumption of | |
889 | * "classic" storage for most operations. However, if we create a new home, then let's user LUKS if | |
890 | * nothing is specified. */ | |
891 | ||
892 | r = detect_container(); | |
893 | if (r < 0) | |
894 | return log_error_errno(r, "Failed to determine whether we are in a container: %m"); | |
895 | if (r == 0) { | |
896 | r = path_is_encrypted("/home"); | |
897 | if (r < 0) | |
898 | log_warning_errno(r, "Failed to determine if /home is encrypted, ignoring: %m"); | |
899 | if (r <= 0) { | |
900 | log_info("Using automatic default storage of '%s'.", user_storage_to_string(USER_LUKS)); | |
901 | *ret = USER_LUKS; | |
902 | return 0; | |
903 | } | |
904 | ||
905 | log_info("/home is encrypted, not using '%s' storage, in order to avoid double encryption.", user_storage_to_string(USER_LUKS)); | |
906 | } else | |
907 | log_info("Running in container, not using '%s' storage.", user_storage_to_string(USER_LUKS)); | |
908 | ||
909 | r = path_is_fs_type("/home", BTRFS_SUPER_MAGIC); | |
910 | if (r < 0) | |
911 | log_warning_errno(r, "Failed to determine file system of /home, ignoring: %m"); | |
912 | if (r > 0) { | |
913 | log_info("/home is on btrfs, using '%s' as storage.", user_storage_to_string(USER_SUBVOLUME)); | |
914 | *ret = USER_SUBVOLUME; | |
915 | } else { | |
916 | log_info("/home is on simple file system, using '%s' as storage.", user_storage_to_string(USER_DIRECTORY)); | |
917 | *ret = USER_DIRECTORY; | |
918 | } | |
919 | ||
920 | return 0; | |
921 | } | |
922 | ||
70a5db58 LP |
923 | static int home_create(UserRecord *h, UserRecord **ret_home) { |
924 | _cleanup_(strv_free_erasep) char **effective_passwords = NULL, **pkcs11_decrypted_passwords = NULL; | |
925 | _cleanup_(user_record_unrefp) UserRecord *new_home = NULL; | |
1dfe5de0 LP |
926 | UserStorage new_storage = _USER_STORAGE_INVALID; |
927 | const char *new_fs = NULL; | |
70a5db58 LP |
928 | int r; |
929 | ||
930 | assert(h); | |
931 | ||
932 | if (!h->user_name) | |
933 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record lacks name, refusing."); | |
934 | if (!uid_is_valid(h->uid)) | |
935 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record lacks UID, refusing."); | |
936 | ||
937 | r = user_record_compile_effective_passwords(h, &effective_passwords, &pkcs11_decrypted_passwords); | |
938 | if (r < 0) | |
939 | return r; | |
940 | ||
941 | r = user_record_test_home_directory_and_warn(h); | |
942 | if (r < 0) | |
943 | return r; | |
944 | if (r != USER_TEST_ABSENT) | |
945 | return log_error_errno(SYNTHETIC_ERRNO(EEXIST), "Home directory %s already exists, refusing.", user_record_home_directory(h)); | |
946 | ||
70a5db58 | 947 | if (h->storage < 0) { |
1dfe5de0 | 948 | r = determine_default_storage(&new_storage); |
70a5db58 | 949 | if (r < 0) |
1dfe5de0 LP |
950 | return r; |
951 | } | |
70a5db58 | 952 | |
1dfe5de0 LP |
953 | if ((h->storage == USER_LUKS || |
954 | (h->storage < 0 && new_storage == USER_LUKS)) && | |
955 | !h->file_system_type) | |
956 | new_fs = getenv("SYSTEMD_HOME_DEFAULT_FILE_SYSTEM_TYPE"); | |
70a5db58 | 957 | |
1dfe5de0 | 958 | if (new_storage >= 0 || new_fs) { |
70a5db58 LP |
959 | r = user_record_add_binding( |
960 | h, | |
961 | new_storage, | |
962 | NULL, | |
963 | SD_ID128_NULL, | |
964 | SD_ID128_NULL, | |
965 | SD_ID128_NULL, | |
966 | NULL, | |
967 | NULL, | |
968 | UINT64_MAX, | |
1dfe5de0 | 969 | new_fs, |
70a5db58 LP |
970 | NULL, |
971 | UID_INVALID, | |
972 | GID_INVALID); | |
973 | if (r < 0) | |
974 | return log_error_errno(r, "Failed to change storage type to LUKS: %m"); | |
70a5db58 LP |
975 | } |
976 | ||
977 | r = user_record_test_image_path_and_warn(h); | |
978 | if (r < 0) | |
979 | return r; | |
980 | if (!IN_SET(r, USER_TEST_ABSENT, USER_TEST_UNDEFINED, USER_TEST_MAYBE)) | |
981 | return log_error_errno(SYNTHETIC_ERRNO(EEXIST), "Image path %s already exists, refusing.", user_record_image_path(h)); | |
982 | ||
983 | switch (user_record_storage(h)) { | |
984 | ||
985 | case USER_LUKS: | |
986 | r = home_create_luks(h, pkcs11_decrypted_passwords, effective_passwords, &new_home); | |
987 | break; | |
988 | ||
989 | case USER_DIRECTORY: | |
990 | case USER_SUBVOLUME: | |
991 | r = home_create_directory_or_subvolume(h, &new_home); | |
992 | break; | |
993 | ||
994 | case USER_FSCRYPT: | |
995 | r = home_create_fscrypt(h, effective_passwords, &new_home); | |
996 | break; | |
997 | ||
998 | case USER_CIFS: | |
999 | r = home_create_cifs(h, &new_home); | |
1000 | break; | |
1001 | ||
1002 | default: | |
1003 | return log_error_errno(SYNTHETIC_ERRNO(ENOTTY), | |
1004 | "Creating home directories of type '%s' currently not supported.", user_storage_to_string(user_record_storage(h))); | |
1005 | } | |
1006 | if (r < 0) | |
1007 | return r; | |
1008 | ||
1009 | if (user_record_equal(h, new_home)) { | |
1010 | *ret_home = NULL; | |
1011 | return 0; | |
1012 | } | |
1013 | ||
1014 | *ret_home = TAKE_PTR(new_home); | |
1015 | return 1; | |
1016 | } | |
1017 | ||
1018 | static int home_remove(UserRecord *h) { | |
1019 | bool deleted = false; | |
1020 | const char *ip, *hd; | |
1021 | int r; | |
1022 | ||
1023 | assert(h); | |
1024 | ||
1025 | if (!h->user_name) | |
1026 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record lacks user name, refusing."); | |
1027 | if (!IN_SET(user_record_storage(h), USER_LUKS, USER_DIRECTORY, USER_SUBVOLUME, USER_FSCRYPT, USER_CIFS)) | |
1028 | return log_error_errno(SYNTHETIC_ERRNO(ENOTTY), "Removing home directories of type '%s' currently not supported.", user_storage_to_string(user_record_storage(h))); | |
1029 | ||
1030 | hd = user_record_home_directory(h); | |
1031 | ||
1032 | r = user_record_test_home_directory_and_warn(h); | |
1033 | if (r < 0) | |
1034 | return r; | |
1035 | if (r == USER_TEST_MOUNTED) | |
1036 | return log_error_errno(SYNTHETIC_ERRNO(EBUSY), "Directory %s is still mounted, refusing.", hd); | |
1037 | ||
1038 | assert(hd); | |
1039 | ||
1040 | r = user_record_test_image_path_and_warn(h); | |
1041 | if (r < 0) | |
1042 | return r; | |
1043 | ||
1044 | ip = user_record_image_path(h); | |
1045 | ||
1046 | switch (user_record_storage(h)) { | |
1047 | ||
1048 | case USER_LUKS: { | |
1049 | struct stat st; | |
1050 | ||
1051 | assert(ip); | |
1052 | ||
1053 | if (stat(ip, &st) < 0) { | |
6b8664cb | 1054 | if (errno != ENOENT) |
80ace4f2 | 1055 | return log_error_errno(errno, "Failed to stat() %s: %m", ip); |
70a5db58 LP |
1056 | |
1057 | } else { | |
1058 | if (S_ISREG(st.st_mode)) { | |
1059 | if (unlink(ip) < 0) { | |
1060 | if (errno != ENOENT) | |
1061 | return log_error_errno(errno, "Failed to remove %s: %m", ip); | |
1062 | } else | |
1063 | deleted = true; | |
1064 | ||
1065 | } else if (S_ISBLK(st.st_mode)) | |
1066 | log_info("Not removing file system on block device %s.", ip); | |
1067 | else | |
1068 | return log_error_errno(SYNTHETIC_ERRNO(ENOTBLK), "Image file %s is neither block device, nor regular, refusing removal.", ip); | |
1069 | } | |
1070 | ||
1071 | break; | |
1072 | } | |
1073 | ||
1074 | case USER_SUBVOLUME: | |
1075 | case USER_DIRECTORY: | |
1076 | case USER_FSCRYPT: | |
1077 | assert(ip); | |
1078 | ||
1079 | r = rm_rf(ip, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); | |
1080 | if (r < 0) { | |
1081 | if (r != -ENOENT) | |
1082 | return log_warning_errno(r, "Failed to remove %s: %m", ip); | |
1083 | } else | |
1084 | deleted = true; | |
1085 | ||
1086 | /* If the image path and the home directory are the same invalidate the home directory, so | |
1087 | * that we don't remove it anymore */ | |
1088 | if (path_equal(ip, hd)) | |
1089 | hd = NULL; | |
1090 | ||
1091 | break; | |
1092 | ||
1093 | case USER_CIFS: | |
1094 | /* Nothing else to do here: we won't remove remote stuff. */ | |
1095 | log_info("Not removing home directory on remote server."); | |
1096 | break; | |
1097 | ||
1098 | default: | |
1099 | assert_not_reached("unknown storage type"); | |
1100 | } | |
1101 | ||
1102 | if (hd) { | |
1103 | if (rmdir(hd) < 0) { | |
1104 | if (errno != ENOENT) | |
1105 | return log_error_errno(errno, "Failed to remove %s, ignoring: %m", hd); | |
1106 | } else | |
1107 | deleted = true; | |
1108 | } | |
1109 | ||
1110 | if (deleted) | |
1111 | log_info("Everything completed."); | |
e4ff0393 FS |
1112 | else |
1113 | return log_notice_errno(SYNTHETIC_ERRNO(EALREADY), | |
1114 | "Nothing to remove."); | |
70a5db58 LP |
1115 | |
1116 | return 0; | |
1117 | } | |
1118 | ||
1119 | static int home_validate_update(UserRecord *h, HomeSetup *setup) { | |
1120 | bool has_mount = false; | |
1121 | int r; | |
1122 | ||
1123 | assert(h); | |
1124 | assert(setup); | |
1125 | ||
1126 | if (!h->user_name) | |
1127 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record lacks user name, refusing."); | |
1128 | if (!uid_is_valid(h->uid)) | |
1129 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record lacks UID, refusing."); | |
1130 | if (!IN_SET(user_record_storage(h), USER_LUKS, USER_DIRECTORY, USER_SUBVOLUME, USER_FSCRYPT, USER_CIFS)) | |
1131 | return log_error_errno(SYNTHETIC_ERRNO(ENOTTY), "Processing home directories of type '%s' currently not supported.", user_storage_to_string(user_record_storage(h))); | |
1132 | ||
1133 | r = user_record_test_home_directory_and_warn(h); | |
1134 | if (r < 0) | |
1135 | return r; | |
1136 | ||
1137 | has_mount = r == USER_TEST_MOUNTED; | |
1138 | ||
1139 | r = user_record_test_image_path_and_warn(h); | |
1140 | if (r < 0) | |
1141 | return r; | |
1142 | if (r == USER_TEST_ABSENT) | |
1143 | return log_error_errno(SYNTHETIC_ERRNO(ENOENT), "Image path %s does not exist", user_record_image_path(h)); | |
1144 | ||
1145 | switch (user_record_storage(h)) { | |
1146 | ||
1147 | case USER_DIRECTORY: | |
1148 | case USER_SUBVOLUME: | |
1149 | case USER_FSCRYPT: | |
1150 | case USER_CIFS: | |
1151 | break; | |
1152 | ||
1153 | case USER_LUKS: { | |
1154 | r = home_validate_update_luks(h, setup); | |
1155 | if (r < 0) | |
1156 | return r; | |
1157 | if ((r > 0) != has_mount) | |
1158 | return log_error_errno(SYNTHETIC_ERRNO(EBUSY), "Home mount incompletely set up."); | |
1159 | ||
1160 | break; | |
1161 | } | |
1162 | ||
1163 | default: | |
1164 | assert_not_reached("unexpected storage type"); | |
1165 | } | |
1166 | ||
1167 | return has_mount; /* return true if the home record is already active */ | |
1168 | } | |
1169 | ||
1170 | static int home_update(UserRecord *h, UserRecord **ret) { | |
1171 | _cleanup_(user_record_unrefp) UserRecord *new_home = NULL, *header_home = NULL, *embedded_home = NULL; | |
1172 | _cleanup_(strv_free_erasep) char **pkcs11_decrypted_passwords = NULL; | |
1173 | _cleanup_(home_setup_undo) HomeSetup setup = HOME_SETUP_INIT; | |
1174 | bool already_activated = false; | |
1175 | int r; | |
1176 | ||
1177 | assert(h); | |
1178 | assert(ret); | |
1179 | ||
1180 | r = user_record_authenticate(h, h, &pkcs11_decrypted_passwords); | |
1181 | if (r < 0) | |
1182 | return r; | |
1183 | ||
1184 | r = home_validate_update(h, &setup); | |
1185 | if (r < 0) | |
1186 | return r; | |
1187 | ||
1188 | already_activated = r > 0; | |
1189 | ||
1190 | r = home_prepare(h, already_activated, &pkcs11_decrypted_passwords, &setup, &header_home); | |
1191 | if (r < 0) | |
1192 | return r; | |
1193 | ||
1194 | r = home_load_embedded_identity(h, setup.root_fd, header_home, USER_RECONCILE_REQUIRE_NEWER, &pkcs11_decrypted_passwords, &embedded_home, &new_home); | |
1195 | if (r < 0) | |
1196 | return r; | |
1197 | ||
1198 | r = home_store_header_identity_luks(new_home, &setup, header_home); | |
1199 | if (r < 0) | |
1200 | return r; | |
1201 | ||
1202 | r = home_store_embedded_identity(new_home, setup.root_fd, h->uid, embedded_home); | |
1203 | if (r < 0) | |
1204 | return r; | |
1205 | ||
1206 | r = home_extend_embedded_identity(new_home, h, &setup); | |
1207 | if (r < 0) | |
1208 | return r; | |
1209 | ||
1210 | r = home_sync_and_statfs(setup.root_fd, NULL); | |
1211 | if (r < 0) | |
1212 | return r; | |
1213 | ||
1214 | r = home_setup_undo(&setup); | |
1215 | if (r < 0) | |
1216 | return r; | |
1217 | ||
1218 | log_info("Everything completed."); | |
1219 | ||
1220 | *ret = TAKE_PTR(new_home); | |
1221 | return 0; | |
1222 | } | |
1223 | ||
1224 | static int home_resize(UserRecord *h, UserRecord **ret) { | |
1225 | _cleanup_(home_setup_undo) HomeSetup setup = HOME_SETUP_INIT; | |
1226 | _cleanup_(strv_free_erasep) char **pkcs11_decrypted_passwords = NULL; | |
1227 | bool already_activated = false; | |
1228 | int r; | |
1229 | ||
1230 | assert(h); | |
1231 | assert(ret); | |
1232 | ||
1233 | if (h->disk_size == UINT64_MAX) | |
1234 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "No target size specified, refusing."); | |
1235 | ||
1236 | r = user_record_authenticate(h, h, &pkcs11_decrypted_passwords); | |
1237 | if (r < 0) | |
1238 | return r; | |
1239 | ||
1240 | r = home_validate_update(h, &setup); | |
1241 | if (r < 0) | |
1242 | return r; | |
1243 | ||
1244 | already_activated = r > 0; | |
1245 | ||
1246 | switch (user_record_storage(h)) { | |
1247 | ||
1248 | case USER_LUKS: | |
1249 | return home_resize_luks(h, already_activated, &pkcs11_decrypted_passwords, &setup, ret); | |
1250 | ||
1251 | case USER_DIRECTORY: | |
1252 | case USER_SUBVOLUME: | |
1253 | case USER_FSCRYPT: | |
1254 | return home_resize_directory(h, already_activated, &pkcs11_decrypted_passwords, &setup, ret); | |
1255 | ||
1256 | default: | |
1257 | return log_error_errno(SYNTHETIC_ERRNO(ENOTTY), "Resizing home directories of type '%s' currently not supported.", user_storage_to_string(user_record_storage(h))); | |
1258 | } | |
1259 | } | |
1260 | ||
1261 | static int home_passwd(UserRecord *h, UserRecord **ret_home) { | |
1262 | _cleanup_(user_record_unrefp) UserRecord *header_home = NULL, *embedded_home = NULL, *new_home = NULL; | |
1263 | _cleanup_(strv_free_erasep) char **effective_passwords = NULL, **pkcs11_decrypted_passwords = NULL; | |
1264 | _cleanup_(home_setup_undo) HomeSetup setup = HOME_SETUP_INIT; | |
1265 | bool already_activated = false; | |
1266 | int r; | |
1267 | ||
1268 | assert(h); | |
1269 | assert(ret_home); | |
1270 | ||
1271 | if (!IN_SET(user_record_storage(h), USER_LUKS, USER_DIRECTORY, USER_SUBVOLUME, USER_FSCRYPT)) | |
1272 | return log_error_errno(SYNTHETIC_ERRNO(ENOTTY), "Changing password of home directories of type '%s' currently not supported.", user_storage_to_string(user_record_storage(h))); | |
1273 | ||
1274 | r = user_record_compile_effective_passwords(h, &effective_passwords, &pkcs11_decrypted_passwords); | |
1275 | if (r < 0) | |
1276 | return r; | |
1277 | ||
1278 | r = home_validate_update(h, &setup); | |
1279 | if (r < 0) | |
1280 | return r; | |
1281 | ||
1282 | already_activated = r > 0; | |
1283 | ||
1284 | r = home_prepare(h, already_activated, &pkcs11_decrypted_passwords, &setup, &header_home); | |
1285 | if (r < 0) | |
1286 | return r; | |
1287 | ||
1288 | r = home_load_embedded_identity(h, setup.root_fd, header_home, USER_RECONCILE_REQUIRE_NEWER_OR_EQUAL, &pkcs11_decrypted_passwords, &embedded_home, &new_home); | |
1289 | if (r < 0) | |
1290 | return r; | |
1291 | ||
1292 | switch (user_record_storage(h)) { | |
1293 | ||
1294 | case USER_LUKS: | |
1295 | r = home_passwd_luks(h, &setup, pkcs11_decrypted_passwords, effective_passwords); | |
1296 | if (r < 0) | |
1297 | return r; | |
1298 | break; | |
1299 | ||
1300 | case USER_FSCRYPT: | |
1301 | r = home_passwd_fscrypt(h, &setup, pkcs11_decrypted_passwords, effective_passwords); | |
1302 | if (r < 0) | |
1303 | return r; | |
1304 | break; | |
1305 | ||
1306 | default: | |
1307 | break; | |
1308 | } | |
1309 | ||
1310 | r = home_store_header_identity_luks(new_home, &setup, header_home); | |
1311 | if (r < 0) | |
1312 | return r; | |
1313 | ||
1314 | r = home_store_embedded_identity(new_home, setup.root_fd, h->uid, embedded_home); | |
1315 | if (r < 0) | |
1316 | return r; | |
1317 | ||
1318 | r = home_extend_embedded_identity(new_home, h, &setup); | |
1319 | if (r < 0) | |
1320 | return r; | |
1321 | ||
1322 | r = home_sync_and_statfs(setup.root_fd, NULL); | |
1323 | if (r < 0) | |
1324 | return r; | |
1325 | ||
1326 | r = home_setup_undo(&setup); | |
1327 | if (r < 0) | |
1328 | return r; | |
1329 | ||
1330 | log_info("Everything completed."); | |
1331 | ||
1332 | *ret_home = TAKE_PTR(new_home); | |
1333 | return 1; | |
1334 | } | |
1335 | ||
1336 | static int home_inspect(UserRecord *h, UserRecord **ret_home) { | |
1337 | _cleanup_(user_record_unrefp) UserRecord *header_home = NULL, *new_home = NULL; | |
1338 | _cleanup_(home_setup_undo) HomeSetup setup = HOME_SETUP_INIT; | |
1339 | _cleanup_(strv_free_erasep) char **pkcs11_decrypted_passwords = NULL; | |
1340 | bool already_activated = false; | |
1341 | int r; | |
1342 | ||
1343 | assert(h); | |
1344 | assert(ret_home); | |
1345 | ||
1346 | r = user_record_authenticate(h, h, &pkcs11_decrypted_passwords); | |
1347 | if (r < 0) | |
1348 | return r; | |
1349 | ||
1350 | r = home_validate_update(h, &setup); | |
1351 | if (r < 0) | |
1352 | return r; | |
1353 | ||
1354 | already_activated = r > 0; | |
1355 | ||
1356 | r = home_prepare(h, already_activated, &pkcs11_decrypted_passwords, &setup, &header_home); | |
1357 | if (r < 0) | |
1358 | return r; | |
1359 | ||
1360 | r = home_load_embedded_identity(h, setup.root_fd, header_home, USER_RECONCILE_ANY, &pkcs11_decrypted_passwords, NULL, &new_home); | |
1361 | if (r < 0) | |
1362 | return r; | |
1363 | ||
1364 | r = home_extend_embedded_identity(new_home, h, &setup); | |
1365 | if (r < 0) | |
1366 | return r; | |
1367 | ||
1368 | r = home_setup_undo(&setup); | |
1369 | if (r < 0) | |
1370 | return r; | |
1371 | ||
1372 | log_info("Everything completed."); | |
1373 | ||
1374 | *ret_home = TAKE_PTR(new_home); | |
1375 | return 1; | |
1376 | } | |
1377 | ||
1378 | static int home_lock(UserRecord *h) { | |
1379 | int r; | |
1380 | ||
1381 | assert(h); | |
1382 | ||
1383 | if (!h->user_name) | |
1384 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record incomplete, refusing."); | |
1385 | if (user_record_storage(h) != USER_LUKS) | |
1386 | return log_error_errno(SYNTHETIC_ERRNO(ENOTTY), "Locking home directories of type '%s' currently not supported.", user_storage_to_string(user_record_storage(h))); | |
1387 | ||
1388 | r = user_record_test_home_directory_and_warn(h); | |
1389 | if (r < 0) | |
1390 | return r; | |
1391 | if (r != USER_TEST_MOUNTED) | |
1392 | return log_error_errno(SYNTHETIC_ERRNO(ENOEXEC), "Home directory of %s is not mounted, can't lock.", h->user_name); | |
1393 | ||
1394 | r = home_lock_luks(h); | |
1395 | if (r < 0) | |
1396 | return r; | |
1397 | ||
1398 | log_info("Everything completed."); | |
1399 | return 1; | |
1400 | } | |
1401 | ||
1402 | static int home_unlock(UserRecord *h) { | |
1403 | _cleanup_(strv_free_erasep) char **pkcs11_decrypted_passwords = NULL; | |
1404 | int r; | |
1405 | ||
1406 | assert(h); | |
1407 | ||
1408 | if (!h->user_name) | |
1409 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record incomplete, refusing."); | |
1410 | if (user_record_storage(h) != USER_LUKS) | |
1411 | return log_error_errno(SYNTHETIC_ERRNO(ENOTTY), "Unlocking home directories of type '%s' currently not supported.", user_storage_to_string(user_record_storage(h))); | |
1412 | ||
1413 | /* Note that we don't check if $HOME is actually mounted, since we want to avoid disk accesses on | |
1414 | * that mount until we have resumed the device. */ | |
1415 | ||
1416 | r = user_record_authenticate(h, h, &pkcs11_decrypted_passwords); | |
1417 | if (r < 0) | |
1418 | return r; | |
1419 | ||
1420 | r = home_unlock_luks(h, &pkcs11_decrypted_passwords); | |
1421 | if (r < 0) | |
1422 | return r; | |
1423 | ||
1424 | log_info("Everything completed."); | |
1425 | return 1; | |
1426 | } | |
1427 | ||
1428 | static int run(int argc, char *argv[]) { | |
1429 | _cleanup_(user_record_unrefp) UserRecord *home = NULL, *new_home = NULL; | |
1430 | _cleanup_(json_variant_unrefp) JsonVariant *v = NULL; | |
1431 | _cleanup_(fclosep) FILE *opened_file = NULL; | |
1432 | unsigned line = 0, column = 0; | |
1433 | const char *json_path = NULL; | |
1434 | FILE *json_file; | |
1435 | usec_t start; | |
1436 | int r; | |
1437 | ||
1438 | start = now(CLOCK_MONOTONIC); | |
1439 | ||
1440 | log_setup_service(); | |
1441 | ||
1442 | umask(0022); | |
1443 | ||
1444 | if (argc < 2 || argc > 3) | |
1445 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "This program takes one or two arguments."); | |
1446 | ||
1447 | if (argc > 2) { | |
1448 | json_path = argv[2]; | |
1449 | ||
1450 | opened_file = fopen(json_path, "re"); | |
1451 | if (!opened_file) | |
1452 | return log_error_errno(errno, "Failed to open %s: %m", json_path); | |
1453 | ||
1454 | json_file = opened_file; | |
1455 | } else { | |
1456 | json_path = "<stdin>"; | |
1457 | json_file = stdin; | |
1458 | } | |
1459 | ||
1460 | r = json_parse_file(json_file, json_path, JSON_PARSE_SENSITIVE, &v, &line, &column); | |
1461 | if (r < 0) | |
1462 | return log_error_errno(r, "[%s:%u:%u] Failed to parse JSON data: %m", json_path, line, column); | |
1463 | ||
1464 | home = user_record_new(); | |
1465 | if (!home) | |
1466 | return log_oom(); | |
1467 | ||
1468 | r = user_record_load(home, v, USER_RECORD_LOAD_FULL|USER_RECORD_LOG); | |
1469 | if (r < 0) | |
1470 | return r; | |
1471 | ||
1472 | /* Well known return values of these operations, that systemd-homed knows and converts to proper D-Bus errors: | |
1473 | * | |
162392b7 ZJS |
1474 | * EMSGSIZE → file systems of this type cannot be shrunk |
1475 | * ETXTBSY → file systems of this type can only be shrunk offline | |
70a5db58 LP |
1476 | * ERANGE → file system size too small |
1477 | * ENOLINK → system does not support selected storage backend | |
1478 | * EPROTONOSUPPORT → system does not support selected file system | |
1479 | * ENOTTY → operation not support on this storage | |
1480 | * ESOCKTNOSUPPORT → operation not support on this file system | |
1481 | * ENOKEY → password incorrect (or not sufficient, or not supplied) | |
1482 | * EBADSLT → similar, but PKCS#11 device is defined and might be able to provide password, if it was plugged in which it is not | |
1483 | * ENOANO → suitable PKCS#11 device found, but PIN is missing to unlock it | |
1484 | * ERFKILL → suitable PKCS#11 device found, but OK to ask for on-device interactive authentication not given | |
1485 | * EOWNERDEAD → suitable PKCS#11 device found, but its PIN is locked | |
1486 | * ENOLCK → suitable PKCS#11 device found, but PIN incorrect | |
1487 | * ETOOMANYREFS → suitable PKCS#11 device found, but PIN incorrect, and only few tries left | |
1488 | * EUCLEAN → suitable PKCS#11 device found, but PIN incorrect, and only one try left | |
1489 | * EBUSY → file system is currently active | |
1490 | * ENOEXEC → file system is currently not active | |
1491 | * ENOSPC → not enough disk space for operation | |
1492 | */ | |
1493 | ||
1494 | if (streq(argv[1], "activate")) | |
1495 | r = home_activate(home, &new_home); | |
1496 | else if (streq(argv[1], "deactivate")) | |
1497 | r = home_deactivate(home, false); | |
1498 | else if (streq(argv[1], "deactivate-force")) | |
1499 | r = home_deactivate(home, true); | |
1500 | else if (streq(argv[1], "create")) | |
1501 | r = home_create(home, &new_home); | |
1502 | else if (streq(argv[1], "remove")) | |
1503 | r = home_remove(home); | |
1504 | else if (streq(argv[1], "update")) | |
1505 | r = home_update(home, &new_home); | |
1506 | else if (streq(argv[1], "resize")) | |
1507 | r = home_resize(home, &new_home); | |
1508 | else if (streq(argv[1], "passwd")) | |
1509 | r = home_passwd(home, &new_home); | |
1510 | else if (streq(argv[1], "inspect")) | |
1511 | r = home_inspect(home, &new_home); | |
1512 | else if (streq(argv[1], "lock")) | |
1513 | r = home_lock(home); | |
1514 | else if (streq(argv[1], "unlock")) | |
1515 | r = home_unlock(home); | |
1516 | else | |
1517 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown verb '%s'.", argv[1]); | |
1518 | if (r == -ENOKEY && !strv_isempty(home->password)) { /* There were passwords specified but they were incorrect */ | |
1519 | usec_t end, n, d; | |
1520 | ||
1521 | /* Make sure bad password replies always take at least 3s, and if longer multiples of 3s, so | |
1522 | * that it's not clear how long we actually needed for our calculations. */ | |
1523 | n = now(CLOCK_MONOTONIC); | |
1524 | assert(n >= start); | |
1525 | ||
1526 | d = usec_sub_unsigned(n, start); | |
1527 | if (d > BAD_PASSWORD_DELAY_USEC) | |
1528 | end = start + DIV_ROUND_UP(d, BAD_PASSWORD_DELAY_USEC) * BAD_PASSWORD_DELAY_USEC; | |
1529 | else | |
1530 | end = start + BAD_PASSWORD_DELAY_USEC; | |
1531 | ||
1532 | if (n < end) | |
1533 | (void) usleep(usec_sub_unsigned(end, n)); | |
1534 | } | |
1535 | if (r < 0) | |
1536 | return r; | |
1537 | ||
1538 | /* We always pass the new record back, regardless if it changed or not. This allows our caller to | |
1539 | * prepare a fresh record, send to us, and only if it works use it without having to keep a local | |
1540 | * copy. */ | |
1541 | if (new_home) | |
1542 | json_variant_dump(new_home->json, JSON_FORMAT_NEWLINE, stdout, NULL); | |
1543 | ||
1544 | return 0; | |
1545 | } | |
1546 | ||
1547 | DEFINE_MAIN_FUNCTION(run); |