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