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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, | |
c8f145ad LP |
38 | char ***pkcs11_decrypted_passwords, |
39 | bool strict_verify) { | |
70a5db58 LP |
40 | |
41 | bool need_password = false, need_token = false, need_pin = false, need_protected_authentication_path_permitted = false, | |
42 | pin_locked = false, pin_incorrect = false, pin_incorrect_few_tries_left = false, pin_incorrect_one_try_left = false; | |
70a5db58 LP |
43 | int r; |
44 | ||
45 | assert(h); | |
46 | assert(secret); | |
47 | ||
48 | /* Tries to authenticate a user record with the supplied secrets. i.e. checks whether at least one | |
49 | * supplied plaintext passwords matches a hashed password field of the user record. Or if a | |
50 | * configured PKCS#11 token is around and can unlock the record. | |
51 | * | |
52 | * Note that the pkcs11_decrypted_passwords parameter is both an input and and output parameter: it | |
53 | * is a list of configured, decrypted PKCS#11 passwords. We typically have to call this function | |
54 | * multiple times over the course of an operation (think: on login we authenticate the host user | |
55 | * record, the record embedded in the LUKS record and the one embedded in $HOME). Hence we keep a | |
56 | * list of passwords we already decrypted, so that we don't have to do the (slow an potentially | |
57 | * interactive) PKCS#11 dance for the relevant token again and again. */ | |
58 | ||
59 | /* First, let's see if the supplied plain-text passwords work? */ | |
60 | r = user_record_test_secret(h, secret); | |
61 | if (r == -ENOKEY) { | |
62 | log_info_errno(r, "None of the supplied plaintext passwords unlocks the user record's hashed passwords."); | |
63 | need_password = true; | |
64 | } else if (r == -ENXIO) | |
65 | log_debug_errno(r, "User record has no hashed passwords, plaintext passwords not tested."); | |
66 | else if (r < 0) | |
67 | return log_error_errno(r, "Failed to validate password of record: %m"); | |
68 | else { | |
69 | log_info("Provided password unlocks user record."); | |
c8f145ad | 70 | return 1; |
70a5db58 LP |
71 | } |
72 | ||
73 | /* Second, let's see if any of the PKCS#11 security tokens are plugged in and help us */ | |
3aeea37d | 74 | for (size_t n = 0; n < h->n_pkcs11_encrypted_key; n++) { |
70a5db58 LP |
75 | #if HAVE_P11KIT |
76 | _cleanup_(pkcs11_callback_data_release) struct pkcs11_callback_data data = { | |
77 | .user_record = h, | |
78 | .secret = secret, | |
79 | .encrypted_key = h->pkcs11_encrypted_key + n, | |
80 | }; | |
81 | char **pp; | |
82 | ||
83 | /* See if any of the previously calculated passwords work */ | |
84 | STRV_FOREACH(pp, *pkcs11_decrypted_passwords) { | |
85 | r = test_password_one(data.encrypted_key->hashed_password, *pp); | |
86 | if (r < 0) | |
87 | return log_error_errno(r, "Failed to check supplied PKCS#11 password: %m"); | |
88 | if (r > 0) { | |
89 | log_info("Previously acquired PKCS#11 password unlocks user record."); | |
c8f145ad | 90 | return 1; |
70a5db58 LP |
91 | } |
92 | } | |
93 | ||
94 | r = pkcs11_find_token(data.encrypted_key->uri, pkcs11_callback, &data); | |
95 | switch (r) { | |
96 | case -EAGAIN: | |
97 | need_token = true; | |
98 | break; | |
99 | case -ENOANO: | |
100 | need_pin = true; | |
101 | break; | |
102 | case -ERFKILL: | |
103 | need_protected_authentication_path_permitted = true; | |
104 | break; | |
105 | case -EOWNERDEAD: | |
106 | pin_locked = true; | |
107 | break; | |
108 | case -ENOLCK: | |
109 | pin_incorrect = true; | |
110 | break; | |
111 | case -ETOOMANYREFS: | |
112 | pin_incorrect = pin_incorrect_few_tries_left = true; | |
113 | break; | |
114 | case -EUCLEAN: | |
115 | pin_incorrect = pin_incorrect_few_tries_left = pin_incorrect_one_try_left = true; | |
116 | break; | |
117 | default: | |
118 | if (r < 0) | |
119 | return r; | |
120 | ||
121 | r = test_password_one(data.encrypted_key->hashed_password, data.decrypted_password); | |
122 | if (r < 0) | |
123 | return log_error_errno(r, "Failed to test PKCS#11 password: %m"); | |
124 | if (r == 0) | |
125 | return log_error_errno(SYNTHETIC_ERRNO(EPERM), "Configured PKCS#11 security token %s does not decrypt encrypted key correctly.", data.encrypted_key->uri); | |
126 | ||
127 | log_info("Decrypted password from PKCS#11 security token %s unlocks user record.", data.encrypted_key->uri); | |
128 | ||
129 | r = strv_extend(pkcs11_decrypted_passwords, data.decrypted_password); | |
130 | if (r < 0) | |
131 | return log_oom(); | |
132 | ||
c8f145ad | 133 | return 1; |
70a5db58 LP |
134 | } |
135 | #else | |
136 | need_token = true; | |
137 | break; | |
138 | #endif | |
139 | } | |
140 | ||
141 | /* Ordered by "relevance", i.e. the most "important" or "interesting" error condition is returned. */ | |
142 | if (pin_incorrect_one_try_left) | |
143 | return -EUCLEAN; | |
144 | if (pin_incorrect_few_tries_left) | |
145 | return -ETOOMANYREFS; | |
146 | if (pin_incorrect) | |
147 | return -ENOLCK; | |
148 | if (pin_locked) | |
149 | return -EOWNERDEAD; | |
150 | if (need_protected_authentication_path_permitted) | |
151 | return -ERFKILL; | |
152 | if (need_pin) | |
153 | return -ENOANO; | |
154 | if (need_token) | |
155 | return -EBADSLT; | |
156 | if (need_password) | |
157 | return -ENOKEY; | |
158 | ||
159 | /* Hmm, this means neither PCKS#11 nor classic hashed passwords were supplied, we cannot authenticate this reasonably */ | |
c8f145ad LP |
160 | if (strict_verify) |
161 | return log_debug_errno(SYNTHETIC_ERRNO(EKEYREVOKED), | |
162 | "No hashed passwords and no PKCS#11 tokens defined, cannot authenticate user record, refusing."); | |
163 | ||
164 | /* If strict verification is off this means we are possibly in the case where we encountered an | |
165 | * unfixated record, i.e. a synthetic one that accordingly lacks any authentication data. In this | |
166 | * case, allow the authentication to pass for now, so that the second (or third) authentication level | |
167 | * (the ones of the user record in the LUKS header or inside the home directory) will then catch | |
168 | * invalid passwords. The second/third authentication always runs in strict verification mode. */ | |
169 | log_debug("No hashed passwords and no PKCS#11 tokens defined in record, cannot authenticate user record. " | |
170 | "Deferring to embedded user record."); | |
171 | return 0; | |
70a5db58 LP |
172 | } |
173 | ||
174 | int home_setup_undo(HomeSetup *setup) { | |
175 | int r = 0, q; | |
176 | ||
177 | assert(setup); | |
178 | ||
28a7f106 LP |
179 | if (setup->root_fd >= 0) { |
180 | if (setup->do_offline_fitrim) { | |
181 | q = run_fitrim(setup->root_fd); | |
182 | if (q < 0) | |
183 | r = q; | |
184 | } | |
185 | ||
186 | setup->root_fd = safe_close(setup->root_fd); | |
187 | } | |
70a5db58 LP |
188 | |
189 | if (setup->undo_mount) { | |
190 | q = umount_verbose("/run/systemd/user-home-mount"); | |
191 | if (q < 0) | |
192 | r = q; | |
193 | } | |
194 | ||
195 | if (setup->undo_dm && setup->crypt_device && setup->dm_name) { | |
196 | q = crypt_deactivate(setup->crypt_device, setup->dm_name); | |
197 | if (q < 0) | |
198 | r = q; | |
199 | } | |
200 | ||
28a7f106 LP |
201 | if (setup->image_fd >= 0) { |
202 | if (setup->do_offline_fallocate) { | |
203 | q = run_fallocate(setup->image_fd, NULL); | |
204 | if (q < 0) | |
205 | r = q; | |
206 | } | |
207 | ||
208 | setup->image_fd = safe_close(setup->image_fd); | |
209 | } | |
210 | ||
70a5db58 LP |
211 | setup->undo_mount = false; |
212 | setup->undo_dm = false; | |
28a7f106 LP |
213 | setup->do_offline_fitrim = false; |
214 | setup->do_offline_fallocate = false; | |
70a5db58 LP |
215 | |
216 | setup->dm_name = mfree(setup->dm_name); | |
217 | setup->dm_node = mfree(setup->dm_node); | |
218 | ||
219 | setup->loop = loop_device_unref(setup->loop); | |
220 | crypt_free(setup->crypt_device); | |
221 | setup->crypt_device = NULL; | |
222 | ||
223 | explicit_bzero_safe(setup->volume_key, setup->volume_key_size); | |
224 | setup->volume_key = mfree(setup->volume_key); | |
225 | setup->volume_key_size = 0; | |
226 | ||
227 | return r; | |
228 | } | |
229 | ||
230 | int home_prepare( | |
231 | UserRecord *h, | |
232 | bool already_activated, | |
233 | char ***pkcs11_decrypted_passwords, | |
234 | HomeSetup *setup, | |
235 | UserRecord **ret_header_home) { | |
236 | ||
237 | int r; | |
238 | ||
239 | assert(h); | |
240 | assert(setup); | |
241 | assert(!setup->loop); | |
242 | assert(!setup->crypt_device); | |
243 | assert(setup->root_fd < 0); | |
244 | assert(!setup->undo_dm); | |
245 | assert(!setup->undo_mount); | |
246 | ||
247 | /* Makes a home directory accessible (through the root_fd file descriptor, not by path!). */ | |
248 | ||
249 | switch (user_record_storage(h)) { | |
250 | ||
251 | case USER_LUKS: | |
252 | return home_prepare_luks(h, already_activated, NULL, pkcs11_decrypted_passwords, setup, ret_header_home); | |
253 | ||
254 | case USER_SUBVOLUME: | |
255 | case USER_DIRECTORY: | |
256 | r = home_prepare_directory(h, already_activated, setup); | |
257 | break; | |
258 | ||
259 | case USER_FSCRYPT: | |
260 | r = home_prepare_fscrypt(h, already_activated, pkcs11_decrypted_passwords, setup); | |
261 | break; | |
262 | ||
263 | case USER_CIFS: | |
264 | r = home_prepare_cifs(h, already_activated, setup); | |
265 | break; | |
266 | ||
267 | default: | |
268 | return log_error_errno(SYNTHETIC_ERRNO(ENOLINK), "Processing home directories of type '%s' currently not supported.", user_storage_to_string(user_record_storage(h))); | |
269 | } | |
270 | ||
271 | if (r < 0) | |
272 | return r; | |
273 | ||
274 | if (ret_header_home) | |
275 | *ret_header_home = NULL; | |
276 | ||
277 | return r; | |
278 | } | |
279 | ||
280 | int home_sync_and_statfs(int root_fd, struct statfs *ret) { | |
281 | assert(root_fd >= 0); | |
282 | ||
283 | /* Let's sync this to disk, so that the disk space reported by fstatfs() below is accurate (for file | |
284 | * systems such as btrfs where this is determined lazily). */ | |
285 | ||
286 | if (syncfs(root_fd) < 0) | |
287 | return log_error_errno(errno, "Failed to synchronize file system: %m"); | |
288 | ||
289 | if (ret) | |
290 | if (fstatfs(root_fd, ret) < 0) | |
291 | return log_error_errno(errno, "Failed to statfs() file system: %m"); | |
292 | ||
293 | log_info("Synchronized disk."); | |
294 | ||
295 | return 0; | |
296 | } | |
297 | ||
298 | static int read_identity_file(int root_fd, JsonVariant **ret) { | |
299 | _cleanup_(fclosep) FILE *identity_file = NULL; | |
300 | _cleanup_close_ int identity_fd = -1; | |
301 | unsigned line, column; | |
302 | int r; | |
303 | ||
304 | assert(root_fd >= 0); | |
305 | assert(ret); | |
306 | ||
307 | identity_fd = openat(root_fd, ".identity", O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW|O_NONBLOCK); | |
308 | if (identity_fd < 0) | |
309 | return log_error_errno(errno, "Failed to open .identity file in home directory: %m"); | |
310 | ||
311 | r = fd_verify_regular(identity_fd); | |
312 | if (r < 0) | |
313 | return log_error_errno(r, "Embedded identity file is not a regular file, refusing: %m"); | |
314 | ||
4fa744a3 | 315 | identity_file = take_fdopen(&identity_fd, "r"); |
70a5db58 LP |
316 | if (!identity_file) |
317 | return log_oom(); | |
318 | ||
70a5db58 LP |
319 | r = json_parse_file(identity_file, ".identity", JSON_PARSE_SENSITIVE, ret, &line, &column); |
320 | if (r < 0) | |
321 | return log_error_errno(r, "[.identity:%u:%u] Failed to parse JSON data: %m", line, column); | |
322 | ||
323 | log_info("Read embedded .identity file."); | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
328 | static int write_identity_file(int root_fd, JsonVariant *v, uid_t uid) { | |
329 | _cleanup_(json_variant_unrefp) JsonVariant *normalized = NULL; | |
330 | _cleanup_(fclosep) FILE *identity_file = NULL; | |
331 | _cleanup_close_ int identity_fd = -1; | |
332 | _cleanup_free_ char *fn = NULL; | |
333 | int r; | |
334 | ||
335 | assert(root_fd >= 0); | |
336 | assert(v); | |
337 | ||
338 | normalized = json_variant_ref(v); | |
339 | ||
340 | r = json_variant_normalize(&normalized); | |
341 | if (r < 0) | |
342 | log_warning_errno(r, "Failed to normalize user record, ignoring: %m"); | |
343 | ||
344 | r = tempfn_random(".identity", NULL, &fn); | |
345 | if (r < 0) | |
346 | return r; | |
347 | ||
348 | identity_fd = openat(root_fd, fn, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0600); | |
349 | if (identity_fd < 0) | |
350 | return log_error_errno(errno, "Failed to create .identity file in home directory: %m"); | |
351 | ||
4fa744a3 | 352 | identity_file = take_fdopen(&identity_fd, "w"); |
70a5db58 LP |
353 | if (!identity_file) { |
354 | r = log_oom(); | |
355 | goto fail; | |
356 | } | |
357 | ||
70a5db58 LP |
358 | json_variant_dump(normalized, JSON_FORMAT_PRETTY, identity_file, NULL); |
359 | ||
360 | r = fflush_and_check(identity_file); | |
361 | if (r < 0) { | |
362 | log_error_errno(r, "Failed to write .identity file: %m"); | |
363 | goto fail; | |
364 | } | |
365 | ||
366 | if (fchown(fileno(identity_file), uid, uid) < 0) { | |
367 | log_error_errno(r, "Failed to change ownership of identity file: %m"); | |
368 | goto fail; | |
369 | } | |
370 | ||
371 | if (renameat(root_fd, fn, root_fd, ".identity") < 0) { | |
372 | r = log_error_errno(errno, "Failed to move identity file into place: %m"); | |
373 | goto fail; | |
374 | } | |
375 | ||
376 | log_info("Wrote embedded .identity file."); | |
377 | ||
378 | return 0; | |
379 | ||
380 | fail: | |
381 | (void) unlinkat(root_fd, fn, 0); | |
382 | return r; | |
383 | } | |
384 | ||
385 | int home_load_embedded_identity( | |
386 | UserRecord *h, | |
387 | int root_fd, | |
388 | UserRecord *header_home, | |
389 | UserReconcileMode mode, | |
390 | char ***pkcs11_decrypted_passwords, | |
391 | UserRecord **ret_embedded_home, | |
392 | UserRecord **ret_new_home) { | |
393 | ||
394 | _cleanup_(user_record_unrefp) UserRecord *embedded_home = NULL, *intermediate_home = NULL, *new_home = NULL; | |
395 | _cleanup_(json_variant_unrefp) JsonVariant *v = NULL; | |
396 | int r; | |
397 | ||
398 | assert(h); | |
399 | assert(root_fd >= 0); | |
400 | ||
401 | r = read_identity_file(root_fd, &v); | |
402 | if (r < 0) | |
403 | return r; | |
404 | ||
405 | embedded_home = user_record_new(); | |
406 | if (!embedded_home) | |
407 | return log_oom(); | |
408 | ||
409 | r = user_record_load(embedded_home, v, USER_RECORD_LOAD_EMBEDDED); | |
410 | if (r < 0) | |
411 | return r; | |
412 | ||
413 | if (!user_record_compatible(h, embedded_home)) | |
80ace4f2 | 414 | return log_error_errno(SYNTHETIC_ERRNO(EREMCHG), "Embedded home record not compatible with host record, refusing."); |
70a5db58 LP |
415 | |
416 | /* Insist that credentials the user supplies also unlocks any embedded records. */ | |
c8f145ad | 417 | r = user_record_authenticate(embedded_home, h, pkcs11_decrypted_passwords, /* strict_verify= */ true); |
70a5db58 LP |
418 | if (r < 0) |
419 | return r; | |
c8f145ad | 420 | assert(r > 0); /* Insist that a password was verified */ |
70a5db58 LP |
421 | |
422 | /* At this point we have three records to deal with: | |
423 | * | |
424 | * · The record we got passed from the host | |
425 | * · The record included in the LUKS header (only if LUKS is used) | |
426 | * · The record in the home directory itself (~.identity) | |
427 | * | |
428 | * Now we have to reconcile all three, and let the newest one win. */ | |
429 | ||
430 | if (header_home) { | |
431 | /* Note we relax the requirements here. Instead of insisting that the host record is strictly | |
432 | * newer, let's also be OK if its equally new. If it is, we'll however insist that the | |
433 | * embedded record must be newer, so that we update at least one of the two. */ | |
434 | ||
435 | r = user_record_reconcile(h, header_home, mode == USER_RECONCILE_REQUIRE_NEWER ? USER_RECONCILE_REQUIRE_NEWER_OR_EQUAL : mode, &intermediate_home); | |
436 | if (r == -EREMCHG) /* this was supposed to be checked earlier already, but let's check this again */ | |
437 | return log_error_errno(r, "Identity stored on host and in header don't match, refusing."); | |
438 | if (r == -ESTALE) | |
439 | return log_error_errno(r, "Embedded identity record is newer than supplied record, refusing."); | |
440 | if (r < 0) | |
441 | return log_error_errno(r, "Failed to reconcile host and header identities: %m"); | |
442 | if (r == USER_RECONCILE_EMBEDDED_WON) | |
443 | log_info("Reconciling header user identity completed (header version was newer)."); | |
444 | else if (r == USER_RECONCILE_HOST_WON) { | |
445 | log_info("Reconciling header user identity completed (host version was newer)."); | |
446 | ||
447 | if (mode == USER_RECONCILE_REQUIRE_NEWER) /* Host version is newer than the header | |
448 | * version, hence we'll update | |
449 | * something. This means we can relax the | |
450 | * requirements on the embedded | |
451 | * identity. */ | |
452 | mode = USER_RECONCILE_REQUIRE_NEWER_OR_EQUAL; | |
453 | } else { | |
454 | assert(r == USER_RECONCILE_IDENTICAL); | |
455 | log_info("Reconciling user identities completed (host and header version were identical)."); | |
456 | } | |
457 | ||
458 | h = intermediate_home; | |
459 | } | |
460 | ||
461 | r = user_record_reconcile(h, embedded_home, mode, &new_home); | |
462 | if (r == -EREMCHG) | |
463 | return log_error_errno(r, "Identity stored on host and in home don't match, refusing."); | |
464 | if (r == -ESTALE) | |
465 | return log_error_errno(r, "Embedded identity record is equally new or newer than supplied record, refusing."); | |
466 | if (r < 0) | |
467 | return log_error_errno(r, "Failed to reconcile host and embedded identities: %m"); | |
468 | if (r == USER_RECONCILE_EMBEDDED_WON) | |
469 | log_info("Reconciling embedded user identity completed (embedded version was newer)."); | |
470 | else if (r == USER_RECONCILE_HOST_WON) | |
471 | log_info("Reconciling embedded user identity completed (host version was newer)."); | |
472 | else { | |
473 | assert(r == USER_RECONCILE_IDENTICAL); | |
474 | log_info("Reconciling embedded user identity completed (host and embedded version were identical)."); | |
475 | } | |
476 | ||
477 | if (ret_embedded_home) | |
478 | *ret_embedded_home = TAKE_PTR(embedded_home); | |
479 | ||
480 | if (ret_new_home) | |
481 | *ret_new_home = TAKE_PTR(new_home); | |
482 | ||
483 | return 0; | |
484 | } | |
485 | ||
486 | int home_store_embedded_identity(UserRecord *h, int root_fd, uid_t uid, UserRecord *old_home) { | |
487 | _cleanup_(user_record_unrefp) UserRecord *embedded = NULL; | |
488 | int r; | |
489 | ||
490 | assert(h); | |
491 | assert(root_fd >= 0); | |
492 | assert(uid_is_valid(uid)); | |
493 | ||
494 | r = user_record_clone(h, USER_RECORD_EXTRACT_EMBEDDED, &embedded); | |
495 | if (r < 0) | |
496 | return log_error_errno(r, "Failed to determine new embedded record: %m"); | |
497 | ||
498 | if (old_home && user_record_equal(old_home, embedded)) { | |
499 | log_debug("Not updating embedded home record."); | |
500 | return 0; | |
501 | } | |
502 | ||
503 | /* The identity has changed, let's update it in the image */ | |
504 | r = write_identity_file(root_fd, embedded->json, h->uid); | |
505 | if (r < 0) | |
506 | return r; | |
507 | ||
508 | return 1; | |
509 | } | |
510 | ||
511 | static const char *file_system_type_fd(int fd) { | |
512 | struct statfs sfs; | |
513 | ||
514 | assert(fd >= 0); | |
515 | ||
516 | if (fstatfs(fd, &sfs) < 0) { | |
517 | log_debug_errno(errno, "Failed to statfs(): %m"); | |
518 | return NULL; | |
519 | } | |
520 | ||
521 | if (is_fs_type(&sfs, XFS_SB_MAGIC)) | |
522 | return "xfs"; | |
523 | if (is_fs_type(&sfs, EXT4_SUPER_MAGIC)) | |
524 | return "ext4"; | |
525 | if (is_fs_type(&sfs, BTRFS_SUPER_MAGIC)) | |
526 | return "btrfs"; | |
527 | ||
528 | return NULL; | |
529 | } | |
530 | ||
531 | int home_extend_embedded_identity(UserRecord *h, UserRecord *used, HomeSetup *setup) { | |
532 | int r; | |
533 | ||
534 | assert(h); | |
535 | assert(used); | |
536 | assert(setup); | |
537 | ||
538 | r = user_record_add_binding( | |
539 | h, | |
540 | user_record_storage(used), | |
541 | user_record_image_path(used), | |
542 | setup->found_partition_uuid, | |
543 | setup->found_luks_uuid, | |
544 | setup->found_fs_uuid, | |
545 | setup->crypt_device ? crypt_get_cipher(setup->crypt_device) : NULL, | |
546 | setup->crypt_device ? crypt_get_cipher_mode(setup->crypt_device) : NULL, | |
547 | setup->crypt_device ? luks_volume_key_size_convert(setup->crypt_device) : UINT64_MAX, | |
548 | file_system_type_fd(setup->root_fd), | |
549 | user_record_home_directory(used), | |
550 | used->uid, | |
551 | (gid_t) used->uid); | |
552 | if (r < 0) | |
553 | return log_error_errno(r, "Failed to update binding in record: %m"); | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
558 | static int chown_recursive_directory(int root_fd, uid_t uid) { | |
559 | int r; | |
560 | ||
561 | assert(root_fd >= 0); | |
562 | assert(uid_is_valid(uid)); | |
563 | ||
564 | r = fd_chown_recursive(root_fd, uid, (gid_t) uid, 0777); | |
565 | if (r < 0) | |
566 | return log_error_errno(r, "Failed to change ownership of files and directories: %m"); | |
567 | if (r == 0) | |
568 | log_info("Recursive changing of ownership not necessary, skipped."); | |
569 | else | |
570 | log_info("Recursive changing of ownership completed."); | |
571 | ||
572 | return 0; | |
573 | } | |
574 | ||
575 | int home_refresh( | |
576 | UserRecord *h, | |
577 | HomeSetup *setup, | |
578 | UserRecord *header_home, | |
579 | char ***pkcs11_decrypted_passwords, | |
580 | struct statfs *ret_statfs, | |
581 | UserRecord **ret_new_home) { | |
582 | ||
583 | _cleanup_(user_record_unrefp) UserRecord *embedded_home = NULL, *new_home = NULL; | |
584 | int r; | |
585 | ||
586 | assert(h); | |
587 | assert(setup); | |
588 | assert(ret_new_home); | |
589 | ||
590 | /* When activating a home directory, does the identity work: loads the identity from the $HOME | |
591 | * directory, reconciles it with our idea, chown()s everything. */ | |
592 | ||
593 | r = home_load_embedded_identity(h, setup->root_fd, header_home, USER_RECONCILE_ANY, pkcs11_decrypted_passwords, &embedded_home, &new_home); | |
594 | if (r < 0) | |
595 | return r; | |
596 | ||
597 | r = home_store_header_identity_luks(new_home, setup, header_home); | |
598 | if (r < 0) | |
599 | return r; | |
600 | ||
601 | r = home_store_embedded_identity(new_home, setup->root_fd, h->uid, embedded_home); | |
602 | if (r < 0) | |
603 | return r; | |
604 | ||
605 | r = chown_recursive_directory(setup->root_fd, h->uid); | |
606 | if (r < 0) | |
607 | return r; | |
608 | ||
609 | r = home_sync_and_statfs(setup->root_fd, ret_statfs); | |
610 | if (r < 0) | |
611 | return r; | |
612 | ||
613 | *ret_new_home = TAKE_PTR(new_home); | |
614 | return 0; | |
615 | } | |
616 | ||
617 | static int home_activate(UserRecord *h, UserRecord **ret_home) { | |
618 | _cleanup_(strv_free_erasep) char **pkcs11_decrypted_passwords = NULL; | |
619 | _cleanup_(user_record_unrefp) UserRecord *new_home = NULL; | |
620 | int r; | |
621 | ||
622 | assert(h); | |
623 | ||
624 | if (!h->user_name) | |
625 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record lacks user name, refusing."); | |
626 | if (!uid_is_valid(h->uid)) | |
627 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record lacks UID, refusing."); | |
628 | if (!IN_SET(user_record_storage(h), USER_LUKS, USER_DIRECTORY, USER_SUBVOLUME, USER_FSCRYPT, USER_CIFS)) | |
629 | return log_error_errno(SYNTHETIC_ERRNO(ENOTTY), "Activating home directories of type '%s' currently not supported.", user_storage_to_string(user_record_storage(h))); | |
630 | ||
c8f145ad | 631 | r = user_record_authenticate(h, h, &pkcs11_decrypted_passwords, /* strict_verify= */ false); |
70a5db58 LP |
632 | if (r < 0) |
633 | return r; | |
634 | ||
635 | r = user_record_test_home_directory_and_warn(h); | |
636 | if (r < 0) | |
637 | return r; | |
638 | if (r == USER_TEST_MOUNTED) | |
639 | return log_error_errno(SYNTHETIC_ERRNO(EALREADY), "Home directory %s is already mounted, refusing.", user_record_home_directory(h)); | |
640 | ||
641 | r = user_record_test_image_path_and_warn(h); | |
642 | if (r < 0) | |
643 | return r; | |
644 | if (r == USER_TEST_ABSENT) | |
645 | return log_error_errno(SYNTHETIC_ERRNO(ENOENT), "Image path %s is missing, refusing.", user_record_image_path(h)); | |
646 | ||
647 | switch (user_record_storage(h)) { | |
648 | ||
649 | case USER_LUKS: | |
650 | r = home_activate_luks(h, &pkcs11_decrypted_passwords, &new_home); | |
651 | if (r < 0) | |
652 | return r; | |
653 | ||
654 | break; | |
655 | ||
656 | case USER_SUBVOLUME: | |
657 | case USER_DIRECTORY: | |
658 | case USER_FSCRYPT: | |
659 | r = home_activate_directory(h, &pkcs11_decrypted_passwords, &new_home); | |
660 | if (r < 0) | |
661 | return r; | |
662 | ||
663 | break; | |
664 | ||
665 | case USER_CIFS: | |
666 | r = home_activate_cifs(h, &pkcs11_decrypted_passwords, &new_home); | |
667 | if (r < 0) | |
668 | return r; | |
669 | ||
670 | break; | |
671 | ||
672 | default: | |
673 | assert_not_reached("unexpected type"); | |
674 | } | |
675 | ||
676 | /* Note that the returned object might either be a reference to an updated version of the existing | |
677 | * home object, or a reference to a newly allocated home object. The caller has to be able to deal | |
678 | * with both, and consider the old object out-of-date. */ | |
679 | if (user_record_equal(h, new_home)) { | |
680 | *ret_home = NULL; | |
681 | return 0; /* no identity change */ | |
682 | } | |
683 | ||
684 | *ret_home = TAKE_PTR(new_home); | |
685 | return 1; /* identity updated */ | |
686 | } | |
687 | ||
688 | static int home_deactivate(UserRecord *h, bool force) { | |
689 | bool done = false; | |
690 | int r; | |
691 | ||
692 | assert(h); | |
693 | ||
694 | if (!h->user_name) | |
695 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record incomplete, refusing."); | |
696 | if (!IN_SET(user_record_storage(h), USER_LUKS, USER_DIRECTORY, USER_SUBVOLUME, USER_FSCRYPT, USER_CIFS)) | |
697 | return log_error_errno(SYNTHETIC_ERRNO(ENOTTY), "Deactivating home directories of type '%s' currently not supported.", user_storage_to_string(user_record_storage(h))); | |
698 | ||
699 | r = user_record_test_home_directory_and_warn(h); | |
700 | if (r < 0) | |
701 | return r; | |
702 | if (r == USER_TEST_MOUNTED) { | |
28a7f106 LP |
703 | if (user_record_storage(h) == USER_LUKS) { |
704 | r = home_trim_luks(h); | |
705 | if (r < 0) | |
706 | return r; | |
707 | } | |
708 | ||
70a5db58 LP |
709 | if (umount2(user_record_home_directory(h), UMOUNT_NOFOLLOW | (force ? MNT_FORCE|MNT_DETACH : 0)) < 0) |
710 | return log_error_errno(errno, "Failed to unmount %s: %m", user_record_home_directory(h)); | |
711 | ||
712 | log_info("Unmounting completed."); | |
713 | done = true; | |
714 | } else | |
715 | log_info("Directory %s is already unmounted.", user_record_home_directory(h)); | |
716 | ||
717 | if (user_record_storage(h) == USER_LUKS) { | |
718 | r = home_deactivate_luks(h); | |
719 | if (r < 0) | |
720 | return r; | |
721 | if (r > 0) | |
722 | done = true; | |
723 | } | |
724 | ||
725 | if (!done) | |
726 | return log_error_errno(SYNTHETIC_ERRNO(ENOEXEC), "Home is not active."); | |
727 | ||
728 | log_info("Everything completed."); | |
729 | return 0; | |
730 | } | |
731 | ||
732 | static int copy_skel(int root_fd, const char *skel) { | |
733 | int r; | |
734 | ||
735 | assert(root_fd >= 0); | |
736 | ||
737 | r = copy_tree_at(AT_FDCWD, skel, root_fd, ".", UID_INVALID, GID_INVALID, COPY_MERGE|COPY_REPLACE); | |
738 | if (r == -ENOENT) { | |
739 | log_info("Skeleton directory %s missing, ignoring.", skel); | |
740 | return 0; | |
741 | } | |
742 | if (r < 0) | |
743 | return log_error_errno(r, "Failed to copy in %s: %m", skel); | |
744 | ||
745 | log_info("Copying in %s completed.", skel); | |
746 | return 0; | |
747 | } | |
748 | ||
749 | static int change_access_mode(int root_fd, mode_t m) { | |
750 | assert(root_fd >= 0); | |
751 | ||
752 | if (fchmod(root_fd, m) < 0) | |
753 | return log_error_errno(errno, "Failed to change access mode of top-level directory: %m"); | |
754 | ||
755 | log_info("Changed top-level directory access mode to 0%o.", m); | |
756 | return 0; | |
757 | } | |
758 | ||
759 | int home_populate(UserRecord *h, int dir_fd) { | |
760 | int r; | |
761 | ||
762 | assert(h); | |
763 | assert(dir_fd >= 0); | |
764 | ||
765 | r = copy_skel(dir_fd, user_record_skeleton_directory(h)); | |
766 | if (r < 0) | |
767 | return r; | |
768 | ||
769 | r = home_store_embedded_identity(h, dir_fd, h->uid, NULL); | |
770 | if (r < 0) | |
771 | return r; | |
772 | ||
773 | r = chown_recursive_directory(dir_fd, h->uid); | |
774 | if (r < 0) | |
775 | return r; | |
776 | ||
777 | r = change_access_mode(dir_fd, user_record_access_mode(h)); | |
778 | if (r < 0) | |
779 | return r; | |
780 | ||
781 | return 0; | |
782 | } | |
783 | ||
784 | static int user_record_compile_effective_passwords( | |
785 | UserRecord *h, | |
786 | char ***ret_effective_passwords, | |
787 | char ***ret_pkcs11_decrypted_passwords) { | |
788 | ||
789 | _cleanup_(strv_free_erasep) char **effective = NULL, **pkcs11_passwords = NULL; | |
790 | size_t n; | |
791 | char **i; | |
792 | int r; | |
793 | ||
794 | assert(h); | |
795 | ||
796 | /* We insist on at least one classic hashed password to be defined in addition to any PKCS#11 one, as | |
797 | * a safe fallback, but also to simplify the password changing algorithm: there we require providing | |
798 | * the old literal password only (and do not care for the old PKCS#11 token) */ | |
799 | ||
800 | if (strv_isempty(h->hashed_password)) | |
801 | return log_error_errno(EINVAL, "User record has no hashed passwords, refusing."); | |
802 | ||
803 | /* Generates the list of plaintext passwords to propagate to LUKS/fscrypt devices, and checks whether | |
804 | * we have a plaintext password for each hashed one. If we are missing one we'll fail, since we | |
805 | * couldn't sync fscrypt/LUKS to the login account properly. */ | |
806 | ||
807 | STRV_FOREACH(i, h->hashed_password) { | |
808 | bool found = false; | |
809 | char **j; | |
810 | ||
811 | log_debug("Looking for plaintext password for: %s", *i); | |
812 | ||
813 | /* Let's scan all provided plaintext passwords */ | |
814 | STRV_FOREACH(j, h->password) { | |
815 | r = test_password_one(*i, *j); | |
816 | if (r < 0) | |
817 | return log_error_errno(r, "Failed to test plain text password: %m"); | |
818 | if (r > 0) { | |
819 | if (ret_effective_passwords) { | |
820 | r = strv_extend(&effective, *j); | |
821 | if (r < 0) | |
822 | return log_oom(); | |
823 | } | |
824 | ||
825 | log_debug("Found literal plaintext password."); | |
826 | found = true; | |
827 | break; | |
828 | } | |
829 | } | |
830 | ||
831 | if (!found) | |
832 | return log_error_errno(SYNTHETIC_ERRNO(ENOKEY), "Missing plaintext password for defined hashed password"); | |
833 | } | |
834 | ||
835 | for (n = 0; n < h->n_pkcs11_encrypted_key; n++) { | |
836 | #if HAVE_P11KIT | |
837 | _cleanup_(pkcs11_callback_data_release) struct pkcs11_callback_data data = { | |
838 | .user_record = h, | |
839 | .secret = h, | |
840 | .encrypted_key = h->pkcs11_encrypted_key + n, | |
841 | }; | |
842 | ||
843 | r = pkcs11_find_token(data.encrypted_key->uri, pkcs11_callback, &data); | |
844 | if (r == -EAGAIN) | |
845 | return -EBADSLT; | |
846 | if (r < 0) | |
847 | return r; | |
848 | ||
849 | r = test_password_one(data.encrypted_key->hashed_password, data.decrypted_password); | |
850 | if (r < 0) | |
851 | return log_error_errno(r, "Failed to test PKCS#11 password: %m"); | |
852 | if (r == 0) | |
853 | return log_error_errno(SYNTHETIC_ERRNO(EPERM), "Decrypted password from token is not correct, refusing."); | |
854 | ||
855 | if (ret_effective_passwords) { | |
856 | r = strv_extend(&effective, data.decrypted_password); | |
857 | if (r < 0) | |
858 | return log_oom(); | |
859 | } | |
860 | ||
861 | if (ret_pkcs11_decrypted_passwords) { | |
862 | r = strv_extend(&pkcs11_passwords, data.decrypted_password); | |
863 | if (r < 0) | |
864 | return log_oom(); | |
865 | } | |
866 | #else | |
867 | return -EBADSLT; | |
868 | #endif | |
869 | } | |
870 | ||
871 | if (ret_effective_passwords) | |
872 | *ret_effective_passwords = TAKE_PTR(effective); | |
873 | if (ret_pkcs11_decrypted_passwords) | |
874 | *ret_pkcs11_decrypted_passwords = TAKE_PTR(pkcs11_passwords); | |
875 | ||
876 | return 0; | |
877 | } | |
878 | ||
1dfe5de0 LP |
879 | static int determine_default_storage(UserStorage *ret) { |
880 | UserStorage storage = _USER_STORAGE_INVALID; | |
881 | const char *e; | |
882 | int r; | |
883 | ||
884 | assert(ret); | |
885 | ||
886 | /* homed tells us via an environment variable which default storage to use */ | |
887 | e = getenv("SYSTEMD_HOME_DEFAULT_STORAGE"); | |
888 | if (e) { | |
889 | storage = user_storage_from_string(e); | |
890 | if (storage < 0) | |
891 | log_warning("$SYSTEMD_HOME_DEFAULT_STORAGE set to invalid storage type, ignoring: %s", e); | |
892 | else { | |
893 | log_info("Using configured default storage '%s'.", user_storage_to_string(storage)); | |
894 | *ret = storage; | |
895 | return 0; | |
896 | } | |
897 | } | |
898 | ||
899 | /* When neither user nor admin specified the storage type to use, fix it to be LUKS — unless we run | |
900 | * in a container where loopback devices and LUKS/DM are not available. Also, if /home is encrypted | |
901 | * anyway, let's avoid duplicate encryption. Note that we typically default to the assumption of | |
902 | * "classic" storage for most operations. However, if we create a new home, then let's user LUKS if | |
903 | * nothing is specified. */ | |
904 | ||
905 | r = detect_container(); | |
906 | if (r < 0) | |
907 | return log_error_errno(r, "Failed to determine whether we are in a container: %m"); | |
908 | if (r == 0) { | |
909 | r = path_is_encrypted("/home"); | |
910 | if (r < 0) | |
911 | log_warning_errno(r, "Failed to determine if /home is encrypted, ignoring: %m"); | |
912 | if (r <= 0) { | |
913 | log_info("Using automatic default storage of '%s'.", user_storage_to_string(USER_LUKS)); | |
914 | *ret = USER_LUKS; | |
915 | return 0; | |
916 | } | |
917 | ||
918 | log_info("/home is encrypted, not using '%s' storage, in order to avoid double encryption.", user_storage_to_string(USER_LUKS)); | |
919 | } else | |
920 | log_info("Running in container, not using '%s' storage.", user_storage_to_string(USER_LUKS)); | |
921 | ||
922 | r = path_is_fs_type("/home", BTRFS_SUPER_MAGIC); | |
923 | if (r < 0) | |
924 | log_warning_errno(r, "Failed to determine file system of /home, ignoring: %m"); | |
925 | if (r > 0) { | |
926 | log_info("/home is on btrfs, using '%s' as storage.", user_storage_to_string(USER_SUBVOLUME)); | |
927 | *ret = USER_SUBVOLUME; | |
928 | } else { | |
929 | log_info("/home is on simple file system, using '%s' as storage.", user_storage_to_string(USER_DIRECTORY)); | |
930 | *ret = USER_DIRECTORY; | |
931 | } | |
932 | ||
933 | return 0; | |
934 | } | |
935 | ||
70a5db58 LP |
936 | static int home_create(UserRecord *h, UserRecord **ret_home) { |
937 | _cleanup_(strv_free_erasep) char **effective_passwords = NULL, **pkcs11_decrypted_passwords = NULL; | |
938 | _cleanup_(user_record_unrefp) UserRecord *new_home = NULL; | |
1dfe5de0 LP |
939 | UserStorage new_storage = _USER_STORAGE_INVALID; |
940 | const char *new_fs = NULL; | |
70a5db58 LP |
941 | int r; |
942 | ||
943 | assert(h); | |
944 | ||
945 | if (!h->user_name) | |
946 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record lacks name, refusing."); | |
947 | if (!uid_is_valid(h->uid)) | |
948 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record lacks UID, refusing."); | |
949 | ||
950 | r = user_record_compile_effective_passwords(h, &effective_passwords, &pkcs11_decrypted_passwords); | |
951 | if (r < 0) | |
952 | return r; | |
953 | ||
954 | r = user_record_test_home_directory_and_warn(h); | |
955 | if (r < 0) | |
956 | return r; | |
957 | if (r != USER_TEST_ABSENT) | |
958 | return log_error_errno(SYNTHETIC_ERRNO(EEXIST), "Home directory %s already exists, refusing.", user_record_home_directory(h)); | |
959 | ||
70a5db58 | 960 | if (h->storage < 0) { |
1dfe5de0 | 961 | r = determine_default_storage(&new_storage); |
70a5db58 | 962 | if (r < 0) |
1dfe5de0 LP |
963 | return r; |
964 | } | |
70a5db58 | 965 | |
1dfe5de0 LP |
966 | if ((h->storage == USER_LUKS || |
967 | (h->storage < 0 && new_storage == USER_LUKS)) && | |
968 | !h->file_system_type) | |
969 | new_fs = getenv("SYSTEMD_HOME_DEFAULT_FILE_SYSTEM_TYPE"); | |
70a5db58 | 970 | |
1dfe5de0 | 971 | if (new_storage >= 0 || new_fs) { |
70a5db58 LP |
972 | r = user_record_add_binding( |
973 | h, | |
974 | new_storage, | |
975 | NULL, | |
976 | SD_ID128_NULL, | |
977 | SD_ID128_NULL, | |
978 | SD_ID128_NULL, | |
979 | NULL, | |
980 | NULL, | |
981 | UINT64_MAX, | |
1dfe5de0 | 982 | new_fs, |
70a5db58 LP |
983 | NULL, |
984 | UID_INVALID, | |
985 | GID_INVALID); | |
986 | if (r < 0) | |
987 | return log_error_errno(r, "Failed to change storage type to LUKS: %m"); | |
70a5db58 LP |
988 | } |
989 | ||
990 | r = user_record_test_image_path_and_warn(h); | |
991 | if (r < 0) | |
992 | return r; | |
993 | if (!IN_SET(r, USER_TEST_ABSENT, USER_TEST_UNDEFINED, USER_TEST_MAYBE)) | |
994 | return log_error_errno(SYNTHETIC_ERRNO(EEXIST), "Image path %s already exists, refusing.", user_record_image_path(h)); | |
995 | ||
996 | switch (user_record_storage(h)) { | |
997 | ||
998 | case USER_LUKS: | |
999 | r = home_create_luks(h, pkcs11_decrypted_passwords, effective_passwords, &new_home); | |
1000 | break; | |
1001 | ||
1002 | case USER_DIRECTORY: | |
1003 | case USER_SUBVOLUME: | |
1004 | r = home_create_directory_or_subvolume(h, &new_home); | |
1005 | break; | |
1006 | ||
1007 | case USER_FSCRYPT: | |
1008 | r = home_create_fscrypt(h, effective_passwords, &new_home); | |
1009 | break; | |
1010 | ||
1011 | case USER_CIFS: | |
1012 | r = home_create_cifs(h, &new_home); | |
1013 | break; | |
1014 | ||
1015 | default: | |
1016 | return log_error_errno(SYNTHETIC_ERRNO(ENOTTY), | |
1017 | "Creating home directories of type '%s' currently not supported.", user_storage_to_string(user_record_storage(h))); | |
1018 | } | |
1019 | if (r < 0) | |
1020 | return r; | |
1021 | ||
1022 | if (user_record_equal(h, new_home)) { | |
1023 | *ret_home = NULL; | |
1024 | return 0; | |
1025 | } | |
1026 | ||
1027 | *ret_home = TAKE_PTR(new_home); | |
1028 | return 1; | |
1029 | } | |
1030 | ||
1031 | static int home_remove(UserRecord *h) { | |
1032 | bool deleted = false; | |
1033 | const char *ip, *hd; | |
1034 | int r; | |
1035 | ||
1036 | assert(h); | |
1037 | ||
1038 | if (!h->user_name) | |
1039 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record lacks user name, refusing."); | |
1040 | if (!IN_SET(user_record_storage(h), USER_LUKS, USER_DIRECTORY, USER_SUBVOLUME, USER_FSCRYPT, USER_CIFS)) | |
1041 | return log_error_errno(SYNTHETIC_ERRNO(ENOTTY), "Removing home directories of type '%s' currently not supported.", user_storage_to_string(user_record_storage(h))); | |
1042 | ||
1043 | hd = user_record_home_directory(h); | |
1044 | ||
1045 | r = user_record_test_home_directory_and_warn(h); | |
1046 | if (r < 0) | |
1047 | return r; | |
1048 | if (r == USER_TEST_MOUNTED) | |
1049 | return log_error_errno(SYNTHETIC_ERRNO(EBUSY), "Directory %s is still mounted, refusing.", hd); | |
1050 | ||
1051 | assert(hd); | |
1052 | ||
1053 | r = user_record_test_image_path_and_warn(h); | |
1054 | if (r < 0) | |
1055 | return r; | |
1056 | ||
1057 | ip = user_record_image_path(h); | |
1058 | ||
1059 | switch (user_record_storage(h)) { | |
1060 | ||
1061 | case USER_LUKS: { | |
1062 | struct stat st; | |
1063 | ||
1064 | assert(ip); | |
1065 | ||
1066 | if (stat(ip, &st) < 0) { | |
6b8664cb | 1067 | if (errno != ENOENT) |
80ace4f2 | 1068 | return log_error_errno(errno, "Failed to stat() %s: %m", ip); |
70a5db58 LP |
1069 | |
1070 | } else { | |
1071 | if (S_ISREG(st.st_mode)) { | |
1072 | if (unlink(ip) < 0) { | |
1073 | if (errno != ENOENT) | |
1074 | return log_error_errno(errno, "Failed to remove %s: %m", ip); | |
1075 | } else | |
1076 | deleted = true; | |
1077 | ||
1078 | } else if (S_ISBLK(st.st_mode)) | |
1079 | log_info("Not removing file system on block device %s.", ip); | |
1080 | else | |
1081 | return log_error_errno(SYNTHETIC_ERRNO(ENOTBLK), "Image file %s is neither block device, nor regular, refusing removal.", ip); | |
1082 | } | |
1083 | ||
1084 | break; | |
1085 | } | |
1086 | ||
1087 | case USER_SUBVOLUME: | |
1088 | case USER_DIRECTORY: | |
1089 | case USER_FSCRYPT: | |
1090 | assert(ip); | |
1091 | ||
1092 | r = rm_rf(ip, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); | |
1093 | if (r < 0) { | |
1094 | if (r != -ENOENT) | |
1095 | return log_warning_errno(r, "Failed to remove %s: %m", ip); | |
1096 | } else | |
1097 | deleted = true; | |
1098 | ||
1099 | /* If the image path and the home directory are the same invalidate the home directory, so | |
1100 | * that we don't remove it anymore */ | |
1101 | if (path_equal(ip, hd)) | |
1102 | hd = NULL; | |
1103 | ||
1104 | break; | |
1105 | ||
1106 | case USER_CIFS: | |
1107 | /* Nothing else to do here: we won't remove remote stuff. */ | |
1108 | log_info("Not removing home directory on remote server."); | |
1109 | break; | |
1110 | ||
1111 | default: | |
1112 | assert_not_reached("unknown storage type"); | |
1113 | } | |
1114 | ||
1115 | if (hd) { | |
1116 | if (rmdir(hd) < 0) { | |
1117 | if (errno != ENOENT) | |
1118 | return log_error_errno(errno, "Failed to remove %s, ignoring: %m", hd); | |
1119 | } else | |
1120 | deleted = true; | |
1121 | } | |
1122 | ||
1123 | if (deleted) | |
1124 | log_info("Everything completed."); | |
e4ff0393 FS |
1125 | else |
1126 | return log_notice_errno(SYNTHETIC_ERRNO(EALREADY), | |
1127 | "Nothing to remove."); | |
70a5db58 LP |
1128 | |
1129 | return 0; | |
1130 | } | |
1131 | ||
1132 | static int home_validate_update(UserRecord *h, HomeSetup *setup) { | |
1133 | bool has_mount = false; | |
1134 | int r; | |
1135 | ||
1136 | assert(h); | |
1137 | assert(setup); | |
1138 | ||
1139 | if (!h->user_name) | |
1140 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record lacks user name, refusing."); | |
1141 | if (!uid_is_valid(h->uid)) | |
1142 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record lacks UID, refusing."); | |
1143 | if (!IN_SET(user_record_storage(h), USER_LUKS, USER_DIRECTORY, USER_SUBVOLUME, USER_FSCRYPT, USER_CIFS)) | |
1144 | return log_error_errno(SYNTHETIC_ERRNO(ENOTTY), "Processing home directories of type '%s' currently not supported.", user_storage_to_string(user_record_storage(h))); | |
1145 | ||
1146 | r = user_record_test_home_directory_and_warn(h); | |
1147 | if (r < 0) | |
1148 | return r; | |
1149 | ||
1150 | has_mount = r == USER_TEST_MOUNTED; | |
1151 | ||
1152 | r = user_record_test_image_path_and_warn(h); | |
1153 | if (r < 0) | |
1154 | return r; | |
1155 | if (r == USER_TEST_ABSENT) | |
1156 | return log_error_errno(SYNTHETIC_ERRNO(ENOENT), "Image path %s does not exist", user_record_image_path(h)); | |
1157 | ||
1158 | switch (user_record_storage(h)) { | |
1159 | ||
1160 | case USER_DIRECTORY: | |
1161 | case USER_SUBVOLUME: | |
1162 | case USER_FSCRYPT: | |
1163 | case USER_CIFS: | |
1164 | break; | |
1165 | ||
1166 | case USER_LUKS: { | |
1167 | r = home_validate_update_luks(h, setup); | |
1168 | if (r < 0) | |
1169 | return r; | |
1170 | if ((r > 0) != has_mount) | |
1171 | return log_error_errno(SYNTHETIC_ERRNO(EBUSY), "Home mount incompletely set up."); | |
1172 | ||
1173 | break; | |
1174 | } | |
1175 | ||
1176 | default: | |
1177 | assert_not_reached("unexpected storage type"); | |
1178 | } | |
1179 | ||
1180 | return has_mount; /* return true if the home record is already active */ | |
1181 | } | |
1182 | ||
1183 | static int home_update(UserRecord *h, UserRecord **ret) { | |
1184 | _cleanup_(user_record_unrefp) UserRecord *new_home = NULL, *header_home = NULL, *embedded_home = NULL; | |
1185 | _cleanup_(strv_free_erasep) char **pkcs11_decrypted_passwords = NULL; | |
1186 | _cleanup_(home_setup_undo) HomeSetup setup = HOME_SETUP_INIT; | |
1187 | bool already_activated = false; | |
1188 | int r; | |
1189 | ||
1190 | assert(h); | |
1191 | assert(ret); | |
1192 | ||
c8f145ad | 1193 | r = user_record_authenticate(h, h, &pkcs11_decrypted_passwords, /* strict_verify= */ true); |
70a5db58 LP |
1194 | if (r < 0) |
1195 | return r; | |
c8f145ad | 1196 | assert(r > 0); /* Insist that a password was verified */ |
70a5db58 LP |
1197 | |
1198 | r = home_validate_update(h, &setup); | |
1199 | if (r < 0) | |
1200 | return r; | |
1201 | ||
1202 | already_activated = r > 0; | |
1203 | ||
1204 | r = home_prepare(h, already_activated, &pkcs11_decrypted_passwords, &setup, &header_home); | |
1205 | if (r < 0) | |
1206 | return r; | |
1207 | ||
1208 | r = home_load_embedded_identity(h, setup.root_fd, header_home, USER_RECONCILE_REQUIRE_NEWER, &pkcs11_decrypted_passwords, &embedded_home, &new_home); | |
1209 | if (r < 0) | |
1210 | return r; | |
1211 | ||
1212 | r = home_store_header_identity_luks(new_home, &setup, header_home); | |
1213 | if (r < 0) | |
1214 | return r; | |
1215 | ||
1216 | r = home_store_embedded_identity(new_home, setup.root_fd, h->uid, embedded_home); | |
1217 | if (r < 0) | |
1218 | return r; | |
1219 | ||
1220 | r = home_extend_embedded_identity(new_home, h, &setup); | |
1221 | if (r < 0) | |
1222 | return r; | |
1223 | ||
1224 | r = home_sync_and_statfs(setup.root_fd, NULL); | |
1225 | if (r < 0) | |
1226 | return r; | |
1227 | ||
1228 | r = home_setup_undo(&setup); | |
1229 | if (r < 0) | |
1230 | return r; | |
1231 | ||
1232 | log_info("Everything completed."); | |
1233 | ||
1234 | *ret = TAKE_PTR(new_home); | |
1235 | return 0; | |
1236 | } | |
1237 | ||
1238 | static int home_resize(UserRecord *h, UserRecord **ret) { | |
1239 | _cleanup_(home_setup_undo) HomeSetup setup = HOME_SETUP_INIT; | |
1240 | _cleanup_(strv_free_erasep) char **pkcs11_decrypted_passwords = NULL; | |
1241 | bool already_activated = false; | |
1242 | int r; | |
1243 | ||
1244 | assert(h); | |
1245 | assert(ret); | |
1246 | ||
1247 | if (h->disk_size == UINT64_MAX) | |
1248 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "No target size specified, refusing."); | |
1249 | ||
c8f145ad | 1250 | r = user_record_authenticate(h, h, &pkcs11_decrypted_passwords, /* strict_verify= */ true); |
70a5db58 LP |
1251 | if (r < 0) |
1252 | return r; | |
c8f145ad | 1253 | assert(r > 0); /* Insist that a password was verified */ |
70a5db58 LP |
1254 | |
1255 | r = home_validate_update(h, &setup); | |
1256 | if (r < 0) | |
1257 | return r; | |
1258 | ||
1259 | already_activated = r > 0; | |
1260 | ||
1261 | switch (user_record_storage(h)) { | |
1262 | ||
1263 | case USER_LUKS: | |
1264 | return home_resize_luks(h, already_activated, &pkcs11_decrypted_passwords, &setup, ret); | |
1265 | ||
1266 | case USER_DIRECTORY: | |
1267 | case USER_SUBVOLUME: | |
1268 | case USER_FSCRYPT: | |
1269 | return home_resize_directory(h, already_activated, &pkcs11_decrypted_passwords, &setup, ret); | |
1270 | ||
1271 | default: | |
1272 | return log_error_errno(SYNTHETIC_ERRNO(ENOTTY), "Resizing home directories of type '%s' currently not supported.", user_storage_to_string(user_record_storage(h))); | |
1273 | } | |
1274 | } | |
1275 | ||
1276 | static int home_passwd(UserRecord *h, UserRecord **ret_home) { | |
1277 | _cleanup_(user_record_unrefp) UserRecord *header_home = NULL, *embedded_home = NULL, *new_home = NULL; | |
1278 | _cleanup_(strv_free_erasep) char **effective_passwords = NULL, **pkcs11_decrypted_passwords = NULL; | |
1279 | _cleanup_(home_setup_undo) HomeSetup setup = HOME_SETUP_INIT; | |
1280 | bool already_activated = false; | |
1281 | int r; | |
1282 | ||
1283 | assert(h); | |
1284 | assert(ret_home); | |
1285 | ||
1286 | if (!IN_SET(user_record_storage(h), USER_LUKS, USER_DIRECTORY, USER_SUBVOLUME, USER_FSCRYPT)) | |
1287 | 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))); | |
1288 | ||
1289 | r = user_record_compile_effective_passwords(h, &effective_passwords, &pkcs11_decrypted_passwords); | |
1290 | if (r < 0) | |
1291 | return r; | |
1292 | ||
1293 | r = home_validate_update(h, &setup); | |
1294 | if (r < 0) | |
1295 | return r; | |
1296 | ||
1297 | already_activated = r > 0; | |
1298 | ||
1299 | r = home_prepare(h, already_activated, &pkcs11_decrypted_passwords, &setup, &header_home); | |
1300 | if (r < 0) | |
1301 | return r; | |
1302 | ||
1303 | r = home_load_embedded_identity(h, setup.root_fd, header_home, USER_RECONCILE_REQUIRE_NEWER_OR_EQUAL, &pkcs11_decrypted_passwords, &embedded_home, &new_home); | |
1304 | if (r < 0) | |
1305 | return r; | |
1306 | ||
1307 | switch (user_record_storage(h)) { | |
1308 | ||
1309 | case USER_LUKS: | |
1310 | r = home_passwd_luks(h, &setup, pkcs11_decrypted_passwords, effective_passwords); | |
1311 | if (r < 0) | |
1312 | return r; | |
1313 | break; | |
1314 | ||
1315 | case USER_FSCRYPT: | |
1316 | r = home_passwd_fscrypt(h, &setup, pkcs11_decrypted_passwords, effective_passwords); | |
1317 | if (r < 0) | |
1318 | return r; | |
1319 | break; | |
1320 | ||
1321 | default: | |
1322 | break; | |
1323 | } | |
1324 | ||
1325 | r = home_store_header_identity_luks(new_home, &setup, header_home); | |
1326 | if (r < 0) | |
1327 | return r; | |
1328 | ||
1329 | r = home_store_embedded_identity(new_home, setup.root_fd, h->uid, embedded_home); | |
1330 | if (r < 0) | |
1331 | return r; | |
1332 | ||
1333 | r = home_extend_embedded_identity(new_home, h, &setup); | |
1334 | if (r < 0) | |
1335 | return r; | |
1336 | ||
1337 | r = home_sync_and_statfs(setup.root_fd, NULL); | |
1338 | if (r < 0) | |
1339 | return r; | |
1340 | ||
1341 | r = home_setup_undo(&setup); | |
1342 | if (r < 0) | |
1343 | return r; | |
1344 | ||
1345 | log_info("Everything completed."); | |
1346 | ||
1347 | *ret_home = TAKE_PTR(new_home); | |
1348 | return 1; | |
1349 | } | |
1350 | ||
1351 | static int home_inspect(UserRecord *h, UserRecord **ret_home) { | |
1352 | _cleanup_(user_record_unrefp) UserRecord *header_home = NULL, *new_home = NULL; | |
1353 | _cleanup_(home_setup_undo) HomeSetup setup = HOME_SETUP_INIT; | |
1354 | _cleanup_(strv_free_erasep) char **pkcs11_decrypted_passwords = NULL; | |
1355 | bool already_activated = false; | |
1356 | int r; | |
1357 | ||
1358 | assert(h); | |
1359 | assert(ret_home); | |
1360 | ||
c8f145ad | 1361 | r = user_record_authenticate(h, h, &pkcs11_decrypted_passwords, /* strict_verify= */ false); |
70a5db58 LP |
1362 | if (r < 0) |
1363 | return r; | |
1364 | ||
1365 | r = home_validate_update(h, &setup); | |
1366 | if (r < 0) | |
1367 | return r; | |
1368 | ||
1369 | already_activated = r > 0; | |
1370 | ||
1371 | r = home_prepare(h, already_activated, &pkcs11_decrypted_passwords, &setup, &header_home); | |
1372 | if (r < 0) | |
1373 | return r; | |
1374 | ||
1375 | r = home_load_embedded_identity(h, setup.root_fd, header_home, USER_RECONCILE_ANY, &pkcs11_decrypted_passwords, NULL, &new_home); | |
1376 | if (r < 0) | |
1377 | return r; | |
1378 | ||
1379 | r = home_extend_embedded_identity(new_home, h, &setup); | |
1380 | if (r < 0) | |
1381 | return r; | |
1382 | ||
1383 | r = home_setup_undo(&setup); | |
1384 | if (r < 0) | |
1385 | return r; | |
1386 | ||
1387 | log_info("Everything completed."); | |
1388 | ||
1389 | *ret_home = TAKE_PTR(new_home); | |
1390 | return 1; | |
1391 | } | |
1392 | ||
1393 | static int home_lock(UserRecord *h) { | |
1394 | int r; | |
1395 | ||
1396 | assert(h); | |
1397 | ||
1398 | if (!h->user_name) | |
1399 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record incomplete, refusing."); | |
1400 | if (user_record_storage(h) != USER_LUKS) | |
1401 | return log_error_errno(SYNTHETIC_ERRNO(ENOTTY), "Locking home directories of type '%s' currently not supported.", user_storage_to_string(user_record_storage(h))); | |
1402 | ||
1403 | r = user_record_test_home_directory_and_warn(h); | |
1404 | if (r < 0) | |
1405 | return r; | |
1406 | if (r != USER_TEST_MOUNTED) | |
1407 | return log_error_errno(SYNTHETIC_ERRNO(ENOEXEC), "Home directory of %s is not mounted, can't lock.", h->user_name); | |
1408 | ||
1409 | r = home_lock_luks(h); | |
1410 | if (r < 0) | |
1411 | return r; | |
1412 | ||
1413 | log_info("Everything completed."); | |
1414 | return 1; | |
1415 | } | |
1416 | ||
1417 | static int home_unlock(UserRecord *h) { | |
1418 | _cleanup_(strv_free_erasep) char **pkcs11_decrypted_passwords = NULL; | |
1419 | int r; | |
1420 | ||
1421 | assert(h); | |
1422 | ||
1423 | if (!h->user_name) | |
1424 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record incomplete, refusing."); | |
1425 | if (user_record_storage(h) != USER_LUKS) | |
1426 | return log_error_errno(SYNTHETIC_ERRNO(ENOTTY), "Unlocking home directories of type '%s' currently not supported.", user_storage_to_string(user_record_storage(h))); | |
1427 | ||
1428 | /* Note that we don't check if $HOME is actually mounted, since we want to avoid disk accesses on | |
1429 | * that mount until we have resumed the device. */ | |
1430 | ||
c8f145ad | 1431 | r = user_record_authenticate(h, h, &pkcs11_decrypted_passwords, /* strict_verify= */ false); |
70a5db58 LP |
1432 | if (r < 0) |
1433 | return r; | |
1434 | ||
1435 | r = home_unlock_luks(h, &pkcs11_decrypted_passwords); | |
1436 | if (r < 0) | |
1437 | return r; | |
1438 | ||
1439 | log_info("Everything completed."); | |
1440 | return 1; | |
1441 | } | |
1442 | ||
1443 | static int run(int argc, char *argv[]) { | |
1444 | _cleanup_(user_record_unrefp) UserRecord *home = NULL, *new_home = NULL; | |
1445 | _cleanup_(json_variant_unrefp) JsonVariant *v = NULL; | |
1446 | _cleanup_(fclosep) FILE *opened_file = NULL; | |
1447 | unsigned line = 0, column = 0; | |
1448 | const char *json_path = NULL; | |
1449 | FILE *json_file; | |
1450 | usec_t start; | |
1451 | int r; | |
1452 | ||
1453 | start = now(CLOCK_MONOTONIC); | |
1454 | ||
1455 | log_setup_service(); | |
1456 | ||
1457 | umask(0022); | |
1458 | ||
1459 | if (argc < 2 || argc > 3) | |
1460 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "This program takes one or two arguments."); | |
1461 | ||
1462 | if (argc > 2) { | |
1463 | json_path = argv[2]; | |
1464 | ||
1465 | opened_file = fopen(json_path, "re"); | |
1466 | if (!opened_file) | |
1467 | return log_error_errno(errno, "Failed to open %s: %m", json_path); | |
1468 | ||
1469 | json_file = opened_file; | |
1470 | } else { | |
1471 | json_path = "<stdin>"; | |
1472 | json_file = stdin; | |
1473 | } | |
1474 | ||
1475 | r = json_parse_file(json_file, json_path, JSON_PARSE_SENSITIVE, &v, &line, &column); | |
1476 | if (r < 0) | |
1477 | return log_error_errno(r, "[%s:%u:%u] Failed to parse JSON data: %m", json_path, line, column); | |
1478 | ||
1479 | home = user_record_new(); | |
1480 | if (!home) | |
1481 | return log_oom(); | |
1482 | ||
1483 | r = user_record_load(home, v, USER_RECORD_LOAD_FULL|USER_RECORD_LOG); | |
1484 | if (r < 0) | |
1485 | return r; | |
1486 | ||
1487 | /* Well known return values of these operations, that systemd-homed knows and converts to proper D-Bus errors: | |
1488 | * | |
162392b7 ZJS |
1489 | * EMSGSIZE → file systems of this type cannot be shrunk |
1490 | * ETXTBSY → file systems of this type can only be shrunk offline | |
70a5db58 LP |
1491 | * ERANGE → file system size too small |
1492 | * ENOLINK → system does not support selected storage backend | |
1493 | * EPROTONOSUPPORT → system does not support selected file system | |
1494 | * ENOTTY → operation not support on this storage | |
1495 | * ESOCKTNOSUPPORT → operation not support on this file system | |
1496 | * ENOKEY → password incorrect (or not sufficient, or not supplied) | |
1497 | * EBADSLT → similar, but PKCS#11 device is defined and might be able to provide password, if it was plugged in which it is not | |
1498 | * ENOANO → suitable PKCS#11 device found, but PIN is missing to unlock it | |
1499 | * ERFKILL → suitable PKCS#11 device found, but OK to ask for on-device interactive authentication not given | |
1500 | * EOWNERDEAD → suitable PKCS#11 device found, but its PIN is locked | |
1501 | * ENOLCK → suitable PKCS#11 device found, but PIN incorrect | |
1502 | * ETOOMANYREFS → suitable PKCS#11 device found, but PIN incorrect, and only few tries left | |
1503 | * EUCLEAN → suitable PKCS#11 device found, but PIN incorrect, and only one try left | |
1504 | * EBUSY → file system is currently active | |
1505 | * ENOEXEC → file system is currently not active | |
1506 | * ENOSPC → not enough disk space for operation | |
cbffdcec | 1507 | * EKEYREVOKED → user record has not suitable hashed password or pkcs#11 entry, we cannot authenticate |
70a5db58 LP |
1508 | */ |
1509 | ||
1510 | if (streq(argv[1], "activate")) | |
1511 | r = home_activate(home, &new_home); | |
1512 | else if (streq(argv[1], "deactivate")) | |
1513 | r = home_deactivate(home, false); | |
1514 | else if (streq(argv[1], "deactivate-force")) | |
1515 | r = home_deactivate(home, true); | |
1516 | else if (streq(argv[1], "create")) | |
1517 | r = home_create(home, &new_home); | |
1518 | else if (streq(argv[1], "remove")) | |
1519 | r = home_remove(home); | |
1520 | else if (streq(argv[1], "update")) | |
1521 | r = home_update(home, &new_home); | |
1522 | else if (streq(argv[1], "resize")) | |
1523 | r = home_resize(home, &new_home); | |
1524 | else if (streq(argv[1], "passwd")) | |
1525 | r = home_passwd(home, &new_home); | |
1526 | else if (streq(argv[1], "inspect")) | |
1527 | r = home_inspect(home, &new_home); | |
1528 | else if (streq(argv[1], "lock")) | |
1529 | r = home_lock(home); | |
1530 | else if (streq(argv[1], "unlock")) | |
1531 | r = home_unlock(home); | |
1532 | else | |
1533 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown verb '%s'.", argv[1]); | |
1534 | if (r == -ENOKEY && !strv_isempty(home->password)) { /* There were passwords specified but they were incorrect */ | |
1535 | usec_t end, n, d; | |
1536 | ||
1537 | /* Make sure bad password replies always take at least 3s, and if longer multiples of 3s, so | |
1538 | * that it's not clear how long we actually needed for our calculations. */ | |
1539 | n = now(CLOCK_MONOTONIC); | |
1540 | assert(n >= start); | |
1541 | ||
1542 | d = usec_sub_unsigned(n, start); | |
1543 | if (d > BAD_PASSWORD_DELAY_USEC) | |
1544 | end = start + DIV_ROUND_UP(d, BAD_PASSWORD_DELAY_USEC) * BAD_PASSWORD_DELAY_USEC; | |
1545 | else | |
1546 | end = start + BAD_PASSWORD_DELAY_USEC; | |
1547 | ||
1548 | if (n < end) | |
1549 | (void) usleep(usec_sub_unsigned(end, n)); | |
1550 | } | |
1551 | if (r < 0) | |
1552 | return r; | |
1553 | ||
1554 | /* We always pass the new record back, regardless if it changed or not. This allows our caller to | |
1555 | * prepare a fresh record, send to us, and only if it works use it without having to keep a local | |
1556 | * copy. */ | |
1557 | if (new_home) | |
1558 | json_variant_dump(new_home->json, JSON_FORMAT_NEWLINE, stdout, NULL); | |
1559 | ||
1560 | return 0; | |
1561 | } | |
1562 | ||
1563 | DEFINE_MAIN_FUNCTION(run); |