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Commit | Line | Data |
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8c1be37e LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2016 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
18b5886e LP |
20 | #ifdef HAVE_LIBCRYPTSETUP |
21 | #include <libcryptsetup.h> | |
22 | #endif | |
23 | #include <linux/dm-ioctl.h> | |
8c1be37e LP |
24 | #include <sys/mount.h> |
25 | ||
26 | #include "architecture.h" | |
18b5886e | 27 | #include "ask-password-api.h" |
8c1be37e LP |
28 | #include "blkid-util.h" |
29 | #include "dissect-image.h" | |
18b5886e | 30 | #include "fd-util.h" |
8c1be37e LP |
31 | #include "gpt.h" |
32 | #include "mount-util.h" | |
33 | #include "path-util.h" | |
34 | #include "stat-util.h" | |
18b5886e | 35 | #include "stdio-util.h" |
8c1be37e LP |
36 | #include "string-table.h" |
37 | #include "string-util.h" | |
38 | #include "udev-util.h" | |
39 | ||
18b5886e LP |
40 | static int probe_filesystem(const char *node, char **ret_fstype) { |
41 | #ifdef HAVE_BLKID | |
42 | _cleanup_blkid_free_probe_ blkid_probe b = NULL; | |
43 | const char *fstype; | |
44 | int r; | |
45 | ||
46 | b = blkid_new_probe_from_filename(node); | |
47 | if (!b) | |
48 | return -ENOMEM; | |
49 | ||
50 | blkid_probe_enable_superblocks(b, 1); | |
51 | blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE); | |
52 | ||
53 | errno = 0; | |
54 | r = blkid_do_safeprobe(b); | |
55 | if (r == -2 || r == 1) { | |
56 | log_debug("Failed to identify any partition type on partition %s", node); | |
57 | goto not_found; | |
58 | } | |
59 | if (r != 0) { | |
60 | if (errno == 0) | |
61 | return -EIO; | |
62 | ||
63 | return -errno; | |
64 | } | |
65 | ||
66 | (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL); | |
67 | ||
68 | if (fstype) { | |
69 | char *t; | |
70 | ||
71 | t = strdup(fstype); | |
72 | if (!t) | |
73 | return -ENOMEM; | |
74 | ||
75 | *ret_fstype = t; | |
76 | return 1; | |
77 | } | |
78 | ||
79 | not_found: | |
80 | *ret_fstype = NULL; | |
81 | return 0; | |
82 | #else | |
83 | return -EOPNOTSUPP; | |
84 | #endif | |
85 | } | |
86 | ||
9b6deb03 | 87 | int dissect_image(int fd, const void *root_hash, size_t root_hash_size, DissectImageFlags flags, DissectedImage **ret) { |
8c1be37e LP |
88 | |
89 | #ifdef HAVE_BLKID | |
4623e8e6 | 90 | sd_id128_t root_uuid = SD_ID128_NULL, verity_uuid = SD_ID128_NULL; |
8c1be37e LP |
91 | _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; |
92 | bool is_gpt, is_mbr, generic_rw, multiple_generic = false; | |
93 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; | |
94 | _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL; | |
95 | _cleanup_blkid_free_probe_ blkid_probe b = NULL; | |
96 | _cleanup_udev_unref_ struct udev *udev = NULL; | |
97 | _cleanup_free_ char *generic_node = NULL; | |
9b6deb03 | 98 | const char *pttype = NULL; |
8c1be37e LP |
99 | struct udev_list_entry *first, *item; |
100 | blkid_partlist pl; | |
101 | int r, generic_nr; | |
102 | struct stat st; | |
103 | unsigned i; | |
104 | ||
105 | assert(fd >= 0); | |
106 | assert(ret); | |
4623e8e6 | 107 | assert(root_hash || root_hash_size == 0); |
8c1be37e LP |
108 | |
109 | /* Probes a disk image, and returns information about what it found in *ret. | |
110 | * | |
4623e8e6 LP |
111 | * Returns -ENOPKG if no suitable partition table or file system could be found. |
112 | * Returns -EADDRNOTAVAIL if a root hash was specified but no matching root/verity partitions found. */ | |
113 | ||
114 | if (root_hash) { | |
115 | /* If a root hash is supplied, then we use the root partition that has a UUID that match the first | |
116 | * 128bit of the root hash. And we use the verity partition that has a UUID that match the final | |
117 | * 128bit. */ | |
118 | ||
119 | if (root_hash_size < sizeof(sd_id128_t)) | |
120 | return -EINVAL; | |
121 | ||
122 | memcpy(&root_uuid, root_hash, sizeof(sd_id128_t)); | |
123 | memcpy(&verity_uuid, (const uint8_t*) root_hash + root_hash_size - sizeof(sd_id128_t), sizeof(sd_id128_t)); | |
124 | ||
125 | if (sd_id128_is_null(root_uuid)) | |
126 | return -EINVAL; | |
127 | if (sd_id128_is_null(verity_uuid)) | |
128 | return -EINVAL; | |
129 | } | |
8c1be37e LP |
130 | |
131 | if (fstat(fd, &st) < 0) | |
132 | return -errno; | |
133 | ||
134 | if (!S_ISBLK(st.st_mode)) | |
135 | return -ENOTBLK; | |
136 | ||
137 | b = blkid_new_probe(); | |
138 | if (!b) | |
139 | return -ENOMEM; | |
140 | ||
141 | errno = 0; | |
142 | r = blkid_probe_set_device(b, fd, 0, 0); | |
143 | if (r != 0) { | |
144 | if (errno == 0) | |
145 | return -ENOMEM; | |
146 | ||
147 | return -errno; | |
148 | } | |
149 | ||
9b6deb03 LP |
150 | if ((flags & DISSECT_IMAGE_GPT_ONLY) == 0) { |
151 | /* Look for file system superblocks, unless we only shall look for GPT partition tables */ | |
152 | blkid_probe_enable_superblocks(b, 1); | |
153 | blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE|BLKID_SUBLKS_USAGE); | |
154 | } | |
155 | ||
8c1be37e LP |
156 | blkid_probe_enable_partitions(b, 1); |
157 | blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS); | |
158 | ||
159 | errno = 0; | |
160 | r = blkid_do_safeprobe(b); | |
161 | if (r == -2 || r == 1) { | |
162 | log_debug("Failed to identify any partition table."); | |
163 | return -ENOPKG; | |
164 | } | |
165 | if (r != 0) { | |
166 | if (errno == 0) | |
167 | return -EIO; | |
168 | ||
169 | return -errno; | |
170 | } | |
171 | ||
172 | m = new0(DissectedImage, 1); | |
173 | if (!m) | |
174 | return -ENOMEM; | |
175 | ||
9b6deb03 LP |
176 | if ((flags & DISSECT_IMAGE_GPT_ONLY) == 0) { |
177 | const char *usage = NULL; | |
8c1be37e | 178 | |
9b6deb03 LP |
179 | (void) blkid_probe_lookup_value(b, "USAGE", &usage, NULL); |
180 | if (STRPTR_IN_SET(usage, "filesystem", "crypto")) { | |
181 | _cleanup_free_ char *t = NULL, *n = NULL; | |
182 | const char *fstype = NULL; | |
8c1be37e | 183 | |
9b6deb03 LP |
184 | /* OK, we have found a file system, that's our root partition then. */ |
185 | (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL); | |
8c1be37e | 186 | |
9b6deb03 LP |
187 | if (fstype) { |
188 | t = strdup(fstype); | |
189 | if (!t) | |
190 | return -ENOMEM; | |
191 | } | |
192 | ||
193 | if (asprintf(&n, "/dev/block/%u:%u", major(st.st_rdev), minor(st.st_rdev)) < 0) | |
194 | return -ENOMEM; | |
8c1be37e | 195 | |
9b6deb03 LP |
196 | m->partitions[PARTITION_ROOT] = (DissectedPartition) { |
197 | .found = true, | |
198 | .rw = true, | |
199 | .partno = -1, | |
200 | .architecture = _ARCHITECTURE_INVALID, | |
201 | .fstype = t, | |
202 | .node = n, | |
203 | }; | |
8c1be37e | 204 | |
9b6deb03 | 205 | t = n = NULL; |
8c1be37e | 206 | |
9b6deb03 | 207 | m->encrypted = streq(fstype, "crypto_LUKS"); |
18b5886e | 208 | |
9b6deb03 LP |
209 | *ret = m; |
210 | m = NULL; | |
8c1be37e | 211 | |
9b6deb03 LP |
212 | return 0; |
213 | } | |
8c1be37e LP |
214 | } |
215 | ||
216 | (void) blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL); | |
217 | if (!pttype) | |
218 | return -ENOPKG; | |
219 | ||
220 | is_gpt = streq_ptr(pttype, "gpt"); | |
221 | is_mbr = streq_ptr(pttype, "dos"); | |
222 | ||
9b6deb03 | 223 | if (!is_gpt && ((flags & DISSECT_IMAGE_GPT_ONLY) || !is_mbr)) |
8c1be37e LP |
224 | return -ENOPKG; |
225 | ||
226 | errno = 0; | |
227 | pl = blkid_probe_get_partitions(b); | |
228 | if (!pl) { | |
229 | if (errno == 0) | |
230 | return -ENOMEM; | |
231 | ||
232 | return -errno; | |
233 | } | |
234 | ||
235 | udev = udev_new(); | |
236 | if (!udev) | |
237 | return -errno; | |
238 | ||
239 | d = udev_device_new_from_devnum(udev, 'b', st.st_rdev); | |
240 | if (!d) | |
241 | return -ENOMEM; | |
242 | ||
243 | for (i = 0;; i++) { | |
244 | int n, z; | |
245 | ||
246 | if (i >= 10) { | |
247 | log_debug("Kernel partitions never appeared."); | |
248 | return -ENXIO; | |
249 | } | |
250 | ||
251 | e = udev_enumerate_new(udev); | |
252 | if (!e) | |
253 | return -errno; | |
254 | ||
255 | r = udev_enumerate_add_match_parent(e, d); | |
256 | if (r < 0) | |
257 | return r; | |
258 | ||
259 | r = udev_enumerate_scan_devices(e); | |
260 | if (r < 0) | |
261 | return r; | |
262 | ||
263 | /* Count the partitions enumerated by the kernel */ | |
264 | n = 0; | |
265 | first = udev_enumerate_get_list_entry(e); | |
266 | udev_list_entry_foreach(item, first) | |
267 | n++; | |
268 | ||
269 | /* Count the partitions enumerated by blkid */ | |
270 | z = blkid_partlist_numof_partitions(pl); | |
271 | if (n == z + 1) | |
272 | break; | |
273 | if (n > z + 1) { | |
274 | log_debug("blkid and kernel partition list do not match."); | |
275 | return -EIO; | |
276 | } | |
277 | if (n < z + 1) { | |
278 | unsigned j; | |
279 | ||
280 | /* The kernel has probed fewer partitions than blkid? Maybe the kernel prober is still running | |
281 | * or it got EBUSY because udev already opened the device. Let's reprobe the device, which is a | |
282 | * synchronous call that waits until probing is complete. */ | |
283 | ||
284 | for (j = 0; j < 20; j++) { | |
285 | ||
286 | r = ioctl(fd, BLKRRPART, 0); | |
287 | if (r < 0) | |
288 | r = -errno; | |
289 | if (r >= 0 || r != -EBUSY) | |
290 | break; | |
291 | ||
292 | /* If something else has the device open, such as an udev rule, the ioctl will return | |
293 | * EBUSY. Since there's no way to wait until it isn't busy anymore, let's just wait a | |
294 | * bit, and try again. | |
295 | * | |
296 | * This is really something they should fix in the kernel! */ | |
297 | ||
298 | usleep(50 * USEC_PER_MSEC); | |
299 | } | |
300 | ||
301 | if (r < 0) | |
302 | return r; | |
303 | } | |
304 | ||
305 | e = udev_enumerate_unref(e); | |
306 | } | |
307 | ||
308 | first = udev_enumerate_get_list_entry(e); | |
309 | udev_list_entry_foreach(item, first) { | |
310 | _cleanup_udev_device_unref_ struct udev_device *q; | |
9b6deb03 | 311 | unsigned long long pflags; |
8c1be37e LP |
312 | blkid_partition pp; |
313 | const char *node; | |
314 | dev_t qn; | |
315 | int nr; | |
316 | ||
317 | q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); | |
318 | if (!q) | |
319 | return -errno; | |
320 | ||
321 | qn = udev_device_get_devnum(q); | |
322 | if (major(qn) == 0) | |
323 | continue; | |
324 | ||
325 | if (st.st_rdev == qn) | |
326 | continue; | |
327 | ||
328 | node = udev_device_get_devnode(q); | |
329 | if (!node) | |
330 | continue; | |
331 | ||
332 | pp = blkid_partlist_devno_to_partition(pl, qn); | |
333 | if (!pp) | |
334 | continue; | |
335 | ||
9b6deb03 | 336 | pflags = blkid_partition_get_flags(pp); |
8c1be37e LP |
337 | |
338 | nr = blkid_partition_get_partno(pp); | |
339 | if (nr < 0) | |
340 | continue; | |
341 | ||
342 | if (is_gpt) { | |
343 | int designator = _PARTITION_DESIGNATOR_INVALID, architecture = _ARCHITECTURE_INVALID; | |
4623e8e6 LP |
344 | const char *stype, *sid, *fstype = NULL; |
345 | sd_id128_t type_id, id; | |
8c1be37e LP |
346 | bool rw = true; |
347 | ||
9b6deb03 | 348 | if (pflags & GPT_FLAG_NO_AUTO) |
8c1be37e LP |
349 | continue; |
350 | ||
4623e8e6 LP |
351 | sid = blkid_partition_get_uuid(pp); |
352 | if (!sid) | |
353 | continue; | |
354 | if (sd_id128_from_string(sid, &id) < 0) | |
355 | continue; | |
356 | ||
8c1be37e LP |
357 | stype = blkid_partition_get_type_string(pp); |
358 | if (!stype) | |
359 | continue; | |
8c1be37e LP |
360 | if (sd_id128_from_string(stype, &type_id) < 0) |
361 | continue; | |
362 | ||
363 | if (sd_id128_equal(type_id, GPT_HOME)) { | |
364 | designator = PARTITION_HOME; | |
9b6deb03 | 365 | rw = !(pflags & GPT_FLAG_READ_ONLY); |
8c1be37e LP |
366 | } else if (sd_id128_equal(type_id, GPT_SRV)) { |
367 | designator = PARTITION_SRV; | |
9b6deb03 | 368 | rw = !(pflags & GPT_FLAG_READ_ONLY); |
8c1be37e LP |
369 | } else if (sd_id128_equal(type_id, GPT_ESP)) { |
370 | designator = PARTITION_ESP; | |
371 | fstype = "vfat"; | |
372 | } | |
373 | #ifdef GPT_ROOT_NATIVE | |
374 | else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) { | |
4623e8e6 LP |
375 | |
376 | /* If a root ID is specified, ignore everything but the root id */ | |
377 | if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id)) | |
378 | continue; | |
379 | ||
8c1be37e LP |
380 | designator = PARTITION_ROOT; |
381 | architecture = native_architecture(); | |
9b6deb03 | 382 | rw = !(pflags & GPT_FLAG_READ_ONLY); |
4f8b86e3 | 383 | } else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE_VERITY)) { |
4623e8e6 LP |
384 | |
385 | m->can_verity = true; | |
386 | ||
387 | /* Ignore verity unless a root hash is specified */ | |
388 | if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id)) | |
389 | continue; | |
390 | ||
391 | designator = PARTITION_ROOT_VERITY; | |
392 | fstype = "DM_verity_hash"; | |
393 | architecture = native_architecture(); | |
394 | rw = false; | |
395 | } | |
396 | #endif | |
8c1be37e LP |
397 | #ifdef GPT_ROOT_SECONDARY |
398 | else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) { | |
4623e8e6 LP |
399 | |
400 | /* If a root ID is specified, ignore everything but the root id */ | |
401 | if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id)) | |
402 | continue; | |
403 | ||
8c1be37e LP |
404 | designator = PARTITION_ROOT_SECONDARY; |
405 | architecture = SECONDARY_ARCHITECTURE; | |
9b6deb03 | 406 | rw = !(pflags & GPT_FLAG_READ_ONLY); |
4f8b86e3 | 407 | } else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY_VERITY)) { |
4623e8e6 LP |
408 | m->can_verity = true; |
409 | ||
410 | /* Ignore verity unless root has is specified */ | |
411 | if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id)) | |
412 | continue; | |
413 | ||
414 | designator = PARTITION_ROOT_SECONDARY_VERITY; | |
415 | fstype = "DM_verity_hash"; | |
416 | architecture = SECONDARY_ARCHITECTURE; | |
417 | rw = false; | |
418 | } | |
8c1be37e LP |
419 | #endif |
420 | else if (sd_id128_equal(type_id, GPT_SWAP)) { | |
421 | designator = PARTITION_SWAP; | |
422 | fstype = "swap"; | |
423 | } else if (sd_id128_equal(type_id, GPT_LINUX_GENERIC)) { | |
424 | ||
425 | if (generic_node) | |
426 | multiple_generic = true; | |
427 | else { | |
428 | generic_nr = nr; | |
9b6deb03 | 429 | generic_rw = !(pflags & GPT_FLAG_READ_ONLY); |
8c1be37e LP |
430 | generic_node = strdup(node); |
431 | if (!generic_node) | |
432 | return -ENOMEM; | |
433 | } | |
434 | } | |
435 | ||
436 | if (designator != _PARTITION_DESIGNATOR_INVALID) { | |
437 | _cleanup_free_ char *t = NULL, *n = NULL; | |
438 | ||
439 | /* First one wins */ | |
440 | if (m->partitions[designator].found) | |
441 | continue; | |
442 | ||
443 | if (fstype) { | |
444 | t = strdup(fstype); | |
445 | if (!t) | |
446 | return -ENOMEM; | |
447 | } | |
448 | ||
449 | n = strdup(node); | |
450 | if (!n) | |
451 | return -ENOMEM; | |
452 | ||
453 | m->partitions[designator] = (DissectedPartition) { | |
454 | .found = true, | |
455 | .partno = nr, | |
456 | .rw = rw, | |
457 | .architecture = architecture, | |
458 | .node = n, | |
459 | .fstype = t, | |
460 | }; | |
461 | ||
462 | n = t = NULL; | |
463 | } | |
464 | ||
465 | } else if (is_mbr) { | |
466 | ||
9b6deb03 | 467 | if (pflags != 0x80) /* Bootable flag */ |
8c1be37e LP |
468 | continue; |
469 | ||
470 | if (blkid_partition_get_type(pp) != 0x83) /* Linux partition */ | |
471 | continue; | |
472 | ||
473 | if (generic_node) | |
474 | multiple_generic = true; | |
475 | else { | |
476 | generic_nr = nr; | |
477 | generic_rw = true; | |
478 | generic_node = strdup(node); | |
479 | if (!generic_node) | |
480 | return -ENOMEM; | |
481 | } | |
482 | } | |
483 | } | |
484 | ||
485 | if (!m->partitions[PARTITION_ROOT].found) { | |
486 | /* No root partition found? Then let's see if ther's one for the secondary architecture. And if not | |
487 | * either, then check if there's a single generic one, and use that. */ | |
488 | ||
4623e8e6 LP |
489 | if (m->partitions[PARTITION_ROOT_VERITY].found) |
490 | return -ENXIO; | |
491 | ||
8c1be37e LP |
492 | if (m->partitions[PARTITION_ROOT_SECONDARY].found) { |
493 | m->partitions[PARTITION_ROOT] = m->partitions[PARTITION_ROOT_SECONDARY]; | |
494 | zero(m->partitions[PARTITION_ROOT_SECONDARY]); | |
4623e8e6 LP |
495 | |
496 | m->partitions[PARTITION_ROOT_VERITY] = m->partitions[PARTITION_ROOT_SECONDARY_VERITY]; | |
497 | zero(m->partitions[PARTITION_ROOT_SECONDARY_VERITY]); | |
498 | ||
499 | } else if (generic_node && !root_hash) { | |
8c1be37e LP |
500 | |
501 | if (multiple_generic) | |
502 | return -ENOTUNIQ; | |
503 | ||
504 | m->partitions[PARTITION_ROOT] = (DissectedPartition) { | |
505 | .found = true, | |
506 | .rw = generic_rw, | |
507 | .partno = generic_nr, | |
508 | .architecture = _ARCHITECTURE_INVALID, | |
509 | .node = generic_node, | |
510 | }; | |
511 | ||
512 | generic_node = NULL; | |
513 | } else | |
514 | return -ENXIO; | |
515 | } | |
516 | ||
4623e8e6 LP |
517 | assert(m->partitions[PARTITION_ROOT].found); |
518 | ||
519 | if (root_hash) { | |
520 | if (!m->partitions[PARTITION_ROOT_VERITY].found) | |
521 | return -EADDRNOTAVAIL; | |
522 | ||
523 | /* If we found the primary root with the hash, then we definitely want to suppress any secondary root | |
524 | * (which would be weird, after all the root hash should only be assigned to one pair of | |
525 | * partitions... */ | |
526 | m->partitions[PARTITION_ROOT_SECONDARY].found = false; | |
527 | m->partitions[PARTITION_ROOT_SECONDARY_VERITY].found = false; | |
528 | ||
529 | /* If we found a verity setup, then the root partition is necessarily read-only. */ | |
530 | m->partitions[PARTITION_ROOT].rw = false; | |
531 | ||
532 | m->verity = true; | |
533 | } | |
534 | ||
18b5886e LP |
535 | blkid_free_probe(b); |
536 | b = NULL; | |
537 | ||
8c1be37e LP |
538 | /* Fill in file system types if we don't know them yet. */ |
539 | for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) { | |
18b5886e | 540 | DissectedPartition *p = m->partitions + i; |
8c1be37e | 541 | |
18b5886e | 542 | if (!p->found) |
8c1be37e LP |
543 | continue; |
544 | ||
18b5886e LP |
545 | if (!p->fstype && p->node) { |
546 | r = probe_filesystem(p->node, &p->fstype); | |
547 | if (r < 0) | |
548 | return r; | |
8c1be37e LP |
549 | } |
550 | ||
18b5886e LP |
551 | if (streq_ptr(p->fstype, "crypto_LUKS")) |
552 | m->encrypted = true; | |
8c1be37e LP |
553 | } |
554 | ||
555 | *ret = m; | |
556 | m = NULL; | |
557 | ||
558 | return 0; | |
559 | #else | |
560 | return -EOPNOTSUPP; | |
561 | #endif | |
562 | } | |
563 | ||
564 | DissectedImage* dissected_image_unref(DissectedImage *m) { | |
565 | unsigned i; | |
566 | ||
567 | if (!m) | |
568 | return NULL; | |
569 | ||
570 | for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) { | |
571 | free(m->partitions[i].fstype); | |
572 | free(m->partitions[i].node); | |
18b5886e LP |
573 | free(m->partitions[i].decrypted_fstype); |
574 | free(m->partitions[i].decrypted_node); | |
8c1be37e LP |
575 | } |
576 | ||
577 | free(m); | |
578 | return NULL; | |
579 | } | |
580 | ||
18b5886e LP |
581 | static int is_loop_device(const char *path) { |
582 | char s[strlen("/sys/dev/block/") + DECIMAL_STR_MAX(dev_t) + 1 + DECIMAL_STR_MAX(dev_t) + strlen("/../loop/")]; | |
583 | struct stat st; | |
584 | ||
585 | assert(path); | |
586 | ||
587 | if (stat(path, &st) < 0) | |
588 | return -errno; | |
589 | ||
590 | if (!S_ISBLK(st.st_mode)) | |
591 | return -ENOTBLK; | |
592 | ||
593 | xsprintf(s, "/sys/dev/block/%u:%u/loop/", major(st.st_rdev), minor(st.st_rdev)); | |
594 | if (access(s, F_OK) < 0) { | |
595 | if (errno != ENOENT) | |
596 | return -errno; | |
597 | ||
598 | /* The device itself isn't a loop device, but maybe it's a partition and its parent is? */ | |
599 | xsprintf(s, "/sys/dev/block/%u:%u/../loop/", major(st.st_rdev), minor(st.st_rdev)); | |
600 | if (access(s, F_OK) < 0) | |
601 | return errno == ENOENT ? false : -errno; | |
602 | } | |
603 | ||
604 | return true; | |
605 | } | |
606 | ||
607 | static int mount_partition( | |
608 | DissectedPartition *m, | |
609 | const char *where, | |
610 | const char *directory, | |
611 | DissectImageFlags flags) { | |
612 | ||
613 | const char *p, *options = NULL, *node, *fstype; | |
8c1be37e LP |
614 | bool rw; |
615 | ||
616 | assert(m); | |
617 | assert(where); | |
618 | ||
18b5886e LP |
619 | node = m->decrypted_node ?: m->node; |
620 | fstype = m->decrypted_fstype ?: m->fstype; | |
621 | ||
622 | if (!m->found || !node || !fstype) | |
8c1be37e LP |
623 | return 0; |
624 | ||
18b5886e LP |
625 | /* Stacked encryption? Yuck */ |
626 | if (streq_ptr(fstype, "crypto_LUKS")) | |
627 | return -ELOOP; | |
628 | ||
629 | rw = m->rw && !(flags & DISSECT_IMAGE_READ_ONLY); | |
8c1be37e LP |
630 | |
631 | if (directory) | |
632 | p = strjoina(where, directory); | |
633 | else | |
634 | p = where; | |
635 | ||
18b5886e LP |
636 | /* If requested, turn on discard support. */ |
637 | if (STR_IN_SET(fstype, "btrfs", "ext4", "vfat", "xfs") && | |
638 | ((flags & DISSECT_IMAGE_DISCARD) || | |
639 | ((flags & DISSECT_IMAGE_DISCARD_ON_LOOP) && is_loop_device(m->node)))) | |
640 | options = "discard"; | |
8c1be37e | 641 | |
18b5886e | 642 | return mount_verbose(LOG_DEBUG, node, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), options); |
8c1be37e LP |
643 | } |
644 | ||
18b5886e | 645 | int dissected_image_mount(DissectedImage *m, const char *where, DissectImageFlags flags) { |
8c1be37e LP |
646 | int r; |
647 | ||
648 | assert(m); | |
649 | assert(where); | |
650 | ||
651 | if (!m->partitions[PARTITION_ROOT].found) | |
652 | return -ENXIO; | |
653 | ||
654 | r = mount_partition(m->partitions + PARTITION_ROOT, where, NULL, flags); | |
655 | if (r < 0) | |
656 | return r; | |
657 | ||
658 | r = mount_partition(m->partitions + PARTITION_HOME, where, "/home", flags); | |
659 | if (r < 0) | |
660 | return r; | |
661 | ||
662 | r = mount_partition(m->partitions + PARTITION_SRV, where, "/srv", flags); | |
663 | if (r < 0) | |
664 | return r; | |
665 | ||
666 | if (m->partitions[PARTITION_ESP].found) { | |
667 | const char *mp, *x; | |
668 | ||
669 | /* Mount the ESP to /efi if it exists and is empty. If it doesn't exist, use /boot instead. */ | |
670 | ||
671 | mp = "/efi"; | |
672 | x = strjoina(where, mp); | |
673 | r = dir_is_empty(x); | |
674 | if (r == -ENOENT) { | |
675 | mp = "/boot"; | |
676 | x = strjoina(where, mp); | |
677 | r = dir_is_empty(x); | |
678 | } | |
679 | if (r > 0) { | |
680 | r = mount_partition(m->partitions + PARTITION_ESP, where, mp, flags); | |
681 | if (r < 0) | |
682 | return r; | |
683 | } | |
684 | } | |
685 | ||
686 | return 0; | |
687 | } | |
688 | ||
18b5886e LP |
689 | #ifdef HAVE_LIBCRYPTSETUP |
690 | typedef struct DecryptedPartition { | |
691 | struct crypt_device *device; | |
692 | char *name; | |
693 | bool relinquished; | |
694 | } DecryptedPartition; | |
695 | ||
696 | struct DecryptedImage { | |
697 | DecryptedPartition *decrypted; | |
698 | size_t n_decrypted; | |
699 | size_t n_allocated; | |
700 | }; | |
701 | #endif | |
702 | ||
703 | DecryptedImage* decrypted_image_unref(DecryptedImage* d) { | |
704 | #ifdef HAVE_LIBCRYPTSETUP | |
705 | size_t i; | |
706 | int r; | |
707 | ||
708 | if (!d) | |
709 | return NULL; | |
710 | ||
711 | for (i = 0; i < d->n_decrypted; i++) { | |
712 | DecryptedPartition *p = d->decrypted + i; | |
713 | ||
714 | if (p->device && p->name && !p->relinquished) { | |
715 | r = crypt_deactivate(p->device, p->name); | |
716 | if (r < 0) | |
717 | log_debug_errno(r, "Failed to deactivate encrypted partition %s", p->name); | |
718 | } | |
719 | ||
720 | if (p->device) | |
721 | crypt_free(p->device); | |
722 | free(p->name); | |
723 | } | |
724 | ||
725 | free(d); | |
726 | #endif | |
727 | return NULL; | |
728 | } | |
729 | ||
730 | #ifdef HAVE_LIBCRYPTSETUP | |
4623e8e6 LP |
731 | |
732 | static int make_dm_name_and_node(const void *original_node, const char *suffix, char **ret_name, char **ret_node) { | |
733 | _cleanup_free_ char *name = NULL, *node = NULL; | |
734 | const char *base; | |
735 | ||
736 | assert(original_node); | |
737 | assert(suffix); | |
738 | assert(ret_name); | |
739 | assert(ret_node); | |
740 | ||
741 | base = strrchr(original_node, '/'); | |
742 | if (!base) | |
743 | return -EINVAL; | |
744 | base++; | |
745 | if (isempty(base)) | |
746 | return -EINVAL; | |
747 | ||
748 | name = strjoin(base, suffix); | |
749 | if (!name) | |
750 | return -ENOMEM; | |
751 | if (!filename_is_valid(name)) | |
752 | return -EINVAL; | |
753 | ||
754 | node = strjoin(crypt_get_dir(), "/", name); | |
755 | if (!node) | |
756 | return -ENOMEM; | |
757 | ||
758 | *ret_name = name; | |
759 | *ret_node = node; | |
760 | ||
761 | name = node = NULL; | |
762 | return 0; | |
763 | } | |
764 | ||
18b5886e LP |
765 | static int decrypt_partition( |
766 | DissectedPartition *m, | |
767 | const char *passphrase, | |
768 | DissectImageFlags flags, | |
769 | DecryptedImage *d) { | |
770 | ||
771 | _cleanup_free_ char *node = NULL, *name = NULL; | |
772 | struct crypt_device *cd; | |
18b5886e LP |
773 | int r; |
774 | ||
775 | assert(m); | |
776 | assert(d); | |
777 | ||
778 | if (!m->found || !m->node || !m->fstype) | |
779 | return 0; | |
780 | ||
781 | if (!streq(m->fstype, "crypto_LUKS")) | |
782 | return 0; | |
783 | ||
4623e8e6 LP |
784 | r = make_dm_name_and_node(m->node, "-decrypted", &name, &node); |
785 | if (r < 0) | |
786 | return r; | |
18b5886e LP |
787 | |
788 | if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1)) | |
789 | return -ENOMEM; | |
790 | ||
791 | r = crypt_init(&cd, m->node); | |
792 | if (r < 0) | |
793 | return r; | |
794 | ||
795 | r = crypt_load(cd, CRYPT_LUKS1, NULL); | |
796 | if (r < 0) | |
797 | goto fail; | |
798 | ||
799 | r = crypt_activate_by_passphrase(cd, name, CRYPT_ANY_SLOT, passphrase, strlen(passphrase), | |
800 | ((flags & DISSECT_IMAGE_READ_ONLY) ? CRYPT_ACTIVATE_READONLY : 0) | | |
801 | ((flags & DISSECT_IMAGE_DISCARD_ON_CRYPTO) ? CRYPT_ACTIVATE_ALLOW_DISCARDS : 0)); | |
802 | if (r == -EPERM) { | |
803 | r = -EKEYREJECTED; | |
804 | goto fail; | |
805 | } | |
806 | if (r < 0) | |
807 | goto fail; | |
808 | ||
809 | d->decrypted[d->n_decrypted].name = name; | |
810 | name = NULL; | |
811 | ||
812 | d->decrypted[d->n_decrypted].device = cd; | |
813 | d->n_decrypted++; | |
814 | ||
815 | m->decrypted_node = node; | |
816 | node = NULL; | |
817 | ||
818 | return 0; | |
819 | ||
4623e8e6 LP |
820 | fail: |
821 | crypt_free(cd); | |
822 | return r; | |
823 | } | |
824 | ||
825 | static int verity_partition( | |
826 | DissectedPartition *m, | |
827 | DissectedPartition *v, | |
828 | const void *root_hash, | |
829 | size_t root_hash_size, | |
830 | DissectImageFlags flags, | |
831 | DecryptedImage *d) { | |
832 | ||
833 | _cleanup_free_ char *node = NULL, *name = NULL; | |
834 | struct crypt_device *cd; | |
835 | int r; | |
836 | ||
837 | assert(m); | |
838 | assert(v); | |
839 | ||
840 | if (!root_hash) | |
841 | return 0; | |
842 | ||
843 | if (!m->found || !m->node || !m->fstype) | |
844 | return 0; | |
845 | if (!v->found || !v->node || !v->fstype) | |
846 | return 0; | |
847 | ||
848 | if (!streq(v->fstype, "DM_verity_hash")) | |
849 | return 0; | |
850 | ||
851 | r = make_dm_name_and_node(m->node, "-verity", &name, &node); | |
852 | if (r < 0) | |
853 | return r; | |
854 | ||
855 | if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1)) | |
856 | return -ENOMEM; | |
857 | ||
858 | r = crypt_init(&cd, v->node); | |
859 | if (r < 0) | |
860 | return r; | |
861 | ||
862 | r = crypt_load(cd, CRYPT_VERITY, NULL); | |
863 | if (r < 0) | |
864 | goto fail; | |
865 | ||
866 | r = crypt_set_data_device(cd, m->node); | |
867 | if (r < 0) | |
868 | goto fail; | |
869 | ||
870 | r = crypt_activate_by_volume_key(cd, name, root_hash, root_hash_size, CRYPT_ACTIVATE_READONLY); | |
871 | if (r < 0) | |
872 | goto fail; | |
873 | ||
874 | d->decrypted[d->n_decrypted].name = name; | |
875 | name = NULL; | |
876 | ||
877 | d->decrypted[d->n_decrypted].device = cd; | |
878 | d->n_decrypted++; | |
879 | ||
880 | m->decrypted_node = node; | |
881 | node = NULL; | |
882 | ||
883 | return 0; | |
884 | ||
18b5886e LP |
885 | fail: |
886 | crypt_free(cd); | |
887 | return r; | |
888 | } | |
889 | #endif | |
890 | ||
891 | int dissected_image_decrypt( | |
892 | DissectedImage *m, | |
893 | const char *passphrase, | |
4623e8e6 LP |
894 | const void *root_hash, |
895 | size_t root_hash_size, | |
18b5886e LP |
896 | DissectImageFlags flags, |
897 | DecryptedImage **ret) { | |
898 | ||
899 | _cleanup_(decrypted_image_unrefp) DecryptedImage *d = NULL; | |
900 | #ifdef HAVE_LIBCRYPTSETUP | |
901 | unsigned i; | |
902 | int r; | |
903 | #endif | |
904 | ||
905 | assert(m); | |
4623e8e6 | 906 | assert(root_hash || root_hash_size == 0); |
18b5886e LP |
907 | |
908 | /* Returns: | |
909 | * | |
910 | * = 0 → There was nothing to decrypt | |
911 | * > 0 → Decrypted successfully | |
912 | * -ENOKEY → There's some to decrypt but no key was supplied | |
913 | * -EKEYREJECTED → Passed key was not correct | |
914 | */ | |
915 | ||
4623e8e6 LP |
916 | if (root_hash && root_hash_size < sizeof(sd_id128_t)) |
917 | return -EINVAL; | |
918 | ||
919 | if (!m->encrypted && !m->verity) { | |
18b5886e LP |
920 | *ret = NULL; |
921 | return 0; | |
922 | } | |
923 | ||
924 | #ifdef HAVE_LIBCRYPTSETUP | |
4623e8e6 | 925 | if (m->encrypted && !passphrase) |
18b5886e LP |
926 | return -ENOKEY; |
927 | ||
928 | d = new0(DecryptedImage, 1); | |
929 | if (!d) | |
930 | return -ENOMEM; | |
931 | ||
932 | for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) { | |
933 | DissectedPartition *p = m->partitions + i; | |
4623e8e6 | 934 | int k; |
18b5886e LP |
935 | |
936 | if (!p->found) | |
937 | continue; | |
938 | ||
939 | r = decrypt_partition(p, passphrase, flags, d); | |
940 | if (r < 0) | |
941 | return r; | |
942 | ||
4623e8e6 LP |
943 | k = PARTITION_VERITY_OF(i); |
944 | if (k >= 0) { | |
945 | r = verity_partition(p, m->partitions + k, root_hash, root_hash_size, flags, d); | |
946 | if (r < 0) | |
947 | return r; | |
948 | } | |
949 | ||
18b5886e LP |
950 | if (!p->decrypted_fstype && p->decrypted_node) { |
951 | r = probe_filesystem(p->decrypted_node, &p->decrypted_fstype); | |
952 | if (r < 0) | |
953 | return r; | |
954 | } | |
955 | } | |
956 | ||
957 | *ret = d; | |
958 | d = NULL; | |
959 | ||
960 | return 1; | |
961 | #else | |
962 | return -EOPNOTSUPP; | |
963 | #endif | |
964 | } | |
965 | ||
966 | int dissected_image_decrypt_interactively( | |
967 | DissectedImage *m, | |
968 | const char *passphrase, | |
4623e8e6 LP |
969 | const void *root_hash, |
970 | size_t root_hash_size, | |
18b5886e LP |
971 | DissectImageFlags flags, |
972 | DecryptedImage **ret) { | |
973 | ||
974 | _cleanup_strv_free_erase_ char **z = NULL; | |
975 | int n = 3, r; | |
976 | ||
977 | if (passphrase) | |
978 | n--; | |
979 | ||
980 | for (;;) { | |
4623e8e6 | 981 | r = dissected_image_decrypt(m, passphrase, root_hash, root_hash_size, flags, ret); |
18b5886e LP |
982 | if (r >= 0) |
983 | return r; | |
984 | if (r == -EKEYREJECTED) | |
985 | log_error_errno(r, "Incorrect passphrase, try again!"); | |
986 | else if (r != -ENOKEY) { | |
987 | log_error_errno(r, "Failed to decrypt image: %m"); | |
988 | return r; | |
989 | } | |
990 | ||
991 | if (--n < 0) { | |
992 | log_error("Too many retries."); | |
993 | return -EKEYREJECTED; | |
994 | } | |
995 | ||
996 | z = strv_free(z); | |
997 | ||
998 | r = ask_password_auto("Please enter image passphrase!", NULL, "dissect", "dissect", USEC_INFINITY, 0, &z); | |
999 | if (r < 0) | |
1000 | return log_error_errno(r, "Failed to query for passphrase: %m"); | |
1001 | ||
1002 | passphrase = z[0]; | |
1003 | } | |
1004 | } | |
1005 | ||
1006 | #ifdef HAVE_LIBCRYPTSETUP | |
1007 | static int deferred_remove(DecryptedPartition *p) { | |
1008 | ||
1009 | struct dm_ioctl dm = { | |
1010 | .version = { | |
1011 | DM_VERSION_MAJOR, | |
1012 | DM_VERSION_MINOR, | |
1013 | DM_VERSION_PATCHLEVEL | |
1014 | }, | |
1015 | .data_size = sizeof(dm), | |
1016 | .flags = DM_DEFERRED_REMOVE, | |
1017 | }; | |
1018 | ||
1019 | _cleanup_close_ int fd = -1; | |
1020 | ||
1021 | assert(p); | |
1022 | ||
1023 | /* Unfortunately, libcryptsetup doesn't provide a proper API for this, hence call the ioctl() directly. */ | |
1024 | ||
1025 | fd = open("/dev/mapper/control", O_RDWR|O_CLOEXEC); | |
1026 | if (fd < 0) | |
1027 | return -errno; | |
1028 | ||
1029 | strncpy(dm.name, p->name, sizeof(dm.name)); | |
1030 | ||
1031 | if (ioctl(fd, DM_DEV_REMOVE, &dm)) | |
1032 | return -errno; | |
1033 | ||
1034 | return 0; | |
1035 | } | |
1036 | #endif | |
1037 | ||
1038 | int decrypted_image_relinquish(DecryptedImage *d) { | |
1039 | ||
1040 | #ifdef HAVE_LIBCRYPTSETUP | |
1041 | size_t i; | |
1042 | int r; | |
1043 | #endif | |
1044 | ||
1045 | assert(d); | |
1046 | ||
1047 | /* Turns on automatic removal after the last use ended for all DM devices of this image, and sets a boolean so | |
1048 | * that we don't clean it up ourselves either anymore */ | |
1049 | ||
1050 | #ifdef HAVE_LIBCRYPTSETUP | |
1051 | for (i = 0; i < d->n_decrypted; i++) { | |
1052 | DecryptedPartition *p = d->decrypted + i; | |
1053 | ||
1054 | if (p->relinquished) | |
1055 | continue; | |
1056 | ||
1057 | r = deferred_remove(p); | |
1058 | if (r < 0) | |
1059 | return log_debug_errno(r, "Failed to mark %s for auto-removal: %m", p->name); | |
1060 | ||
1061 | p->relinquished = true; | |
1062 | } | |
1063 | #endif | |
1064 | ||
1065 | return 0; | |
1066 | } | |
1067 | ||
8c1be37e LP |
1068 | static const char *const partition_designator_table[] = { |
1069 | [PARTITION_ROOT] = "root", | |
1070 | [PARTITION_ROOT_SECONDARY] = "root-secondary", | |
1071 | [PARTITION_HOME] = "home", | |
1072 | [PARTITION_SRV] = "srv", | |
1073 | [PARTITION_ESP] = "esp", | |
1074 | [PARTITION_SWAP] = "swap", | |
4623e8e6 LP |
1075 | [PARTITION_ROOT_VERITY] = "root-verity", |
1076 | [PARTITION_ROOT_SECONDARY_VERITY] = "root-secondary-verity", | |
8c1be37e LP |
1077 | }; |
1078 | ||
1079 | DEFINE_STRING_TABLE_LOOKUP(partition_designator, int); |