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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; | |
be30ad41 | 98 | sd_id128_t generic_uuid = SD_ID128_NULL; |
9b6deb03 | 99 | const char *pttype = NULL; |
8c1be37e LP |
100 | struct udev_list_entry *first, *item; |
101 | blkid_partlist pl; | |
102 | int r, generic_nr; | |
103 | struct stat st; | |
104 | unsigned i; | |
105 | ||
106 | assert(fd >= 0); | |
107 | assert(ret); | |
4623e8e6 | 108 | assert(root_hash || root_hash_size == 0); |
8c1be37e LP |
109 | |
110 | /* Probes a disk image, and returns information about what it found in *ret. | |
111 | * | |
4623e8e6 LP |
112 | * Returns -ENOPKG if no suitable partition table or file system could be found. |
113 | * Returns -EADDRNOTAVAIL if a root hash was specified but no matching root/verity partitions found. */ | |
114 | ||
115 | if (root_hash) { | |
116 | /* If a root hash is supplied, then we use the root partition that has a UUID that match the first | |
117 | * 128bit of the root hash. And we use the verity partition that has a UUID that match the final | |
118 | * 128bit. */ | |
119 | ||
120 | if (root_hash_size < sizeof(sd_id128_t)) | |
121 | return -EINVAL; | |
122 | ||
123 | memcpy(&root_uuid, root_hash, sizeof(sd_id128_t)); | |
124 | memcpy(&verity_uuid, (const uint8_t*) root_hash + root_hash_size - sizeof(sd_id128_t), sizeof(sd_id128_t)); | |
125 | ||
126 | if (sd_id128_is_null(root_uuid)) | |
127 | return -EINVAL; | |
128 | if (sd_id128_is_null(verity_uuid)) | |
129 | return -EINVAL; | |
130 | } | |
8c1be37e LP |
131 | |
132 | if (fstat(fd, &st) < 0) | |
133 | return -errno; | |
134 | ||
135 | if (!S_ISBLK(st.st_mode)) | |
136 | return -ENOTBLK; | |
137 | ||
138 | b = blkid_new_probe(); | |
139 | if (!b) | |
140 | return -ENOMEM; | |
141 | ||
142 | errno = 0; | |
143 | r = blkid_probe_set_device(b, fd, 0, 0); | |
144 | if (r != 0) { | |
145 | if (errno == 0) | |
146 | return -ENOMEM; | |
147 | ||
148 | return -errno; | |
149 | } | |
150 | ||
9b6deb03 LP |
151 | if ((flags & DISSECT_IMAGE_GPT_ONLY) == 0) { |
152 | /* Look for file system superblocks, unless we only shall look for GPT partition tables */ | |
153 | blkid_probe_enable_superblocks(b, 1); | |
154 | blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE|BLKID_SUBLKS_USAGE); | |
155 | } | |
156 | ||
8c1be37e LP |
157 | blkid_probe_enable_partitions(b, 1); |
158 | blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS); | |
159 | ||
160 | errno = 0; | |
161 | r = blkid_do_safeprobe(b); | |
162 | if (r == -2 || r == 1) { | |
163 | log_debug("Failed to identify any partition table."); | |
164 | return -ENOPKG; | |
165 | } | |
166 | if (r != 0) { | |
167 | if (errno == 0) | |
168 | return -EIO; | |
169 | ||
170 | return -errno; | |
171 | } | |
172 | ||
173 | m = new0(DissectedImage, 1); | |
174 | if (!m) | |
175 | return -ENOMEM; | |
176 | ||
e0f9e7bd LP |
177 | if (!(flags & DISSECT_IMAGE_GPT_ONLY) && |
178 | (flags & DISSECT_IMAGE_REQUIRE_ROOT)) { | |
9b6deb03 | 179 | const char *usage = NULL; |
8c1be37e | 180 | |
9b6deb03 LP |
181 | (void) blkid_probe_lookup_value(b, "USAGE", &usage, NULL); |
182 | if (STRPTR_IN_SET(usage, "filesystem", "crypto")) { | |
183 | _cleanup_free_ char *t = NULL, *n = NULL; | |
184 | const char *fstype = NULL; | |
8c1be37e | 185 | |
9b6deb03 LP |
186 | /* OK, we have found a file system, that's our root partition then. */ |
187 | (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL); | |
8c1be37e | 188 | |
9b6deb03 LP |
189 | if (fstype) { |
190 | t = strdup(fstype); | |
191 | if (!t) | |
192 | return -ENOMEM; | |
193 | } | |
194 | ||
195 | if (asprintf(&n, "/dev/block/%u:%u", major(st.st_rdev), minor(st.st_rdev)) < 0) | |
196 | return -ENOMEM; | |
8c1be37e | 197 | |
9b6deb03 LP |
198 | m->partitions[PARTITION_ROOT] = (DissectedPartition) { |
199 | .found = true, | |
200 | .rw = true, | |
201 | .partno = -1, | |
202 | .architecture = _ARCHITECTURE_INVALID, | |
203 | .fstype = t, | |
204 | .node = n, | |
205 | }; | |
8c1be37e | 206 | |
9b6deb03 | 207 | t = n = NULL; |
8c1be37e | 208 | |
9b6deb03 | 209 | m->encrypted = streq(fstype, "crypto_LUKS"); |
18b5886e | 210 | |
9b6deb03 LP |
211 | *ret = m; |
212 | m = NULL; | |
8c1be37e | 213 | |
9b6deb03 LP |
214 | return 0; |
215 | } | |
8c1be37e LP |
216 | } |
217 | ||
218 | (void) blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL); | |
219 | if (!pttype) | |
220 | return -ENOPKG; | |
221 | ||
222 | is_gpt = streq_ptr(pttype, "gpt"); | |
223 | is_mbr = streq_ptr(pttype, "dos"); | |
224 | ||
9b6deb03 | 225 | if (!is_gpt && ((flags & DISSECT_IMAGE_GPT_ONLY) || !is_mbr)) |
8c1be37e LP |
226 | return -ENOPKG; |
227 | ||
228 | errno = 0; | |
229 | pl = blkid_probe_get_partitions(b); | |
230 | if (!pl) { | |
231 | if (errno == 0) | |
232 | return -ENOMEM; | |
233 | ||
234 | return -errno; | |
235 | } | |
236 | ||
237 | udev = udev_new(); | |
238 | if (!udev) | |
239 | return -errno; | |
240 | ||
241 | d = udev_device_new_from_devnum(udev, 'b', st.st_rdev); | |
242 | if (!d) | |
243 | return -ENOMEM; | |
244 | ||
245 | for (i = 0;; i++) { | |
246 | int n, z; | |
247 | ||
248 | if (i >= 10) { | |
249 | log_debug("Kernel partitions never appeared."); | |
250 | return -ENXIO; | |
251 | } | |
252 | ||
253 | e = udev_enumerate_new(udev); | |
254 | if (!e) | |
255 | return -errno; | |
256 | ||
257 | r = udev_enumerate_add_match_parent(e, d); | |
258 | if (r < 0) | |
259 | return r; | |
260 | ||
261 | r = udev_enumerate_scan_devices(e); | |
262 | if (r < 0) | |
263 | return r; | |
264 | ||
265 | /* Count the partitions enumerated by the kernel */ | |
266 | n = 0; | |
267 | first = udev_enumerate_get_list_entry(e); | |
268 | udev_list_entry_foreach(item, first) | |
269 | n++; | |
270 | ||
271 | /* Count the partitions enumerated by blkid */ | |
272 | z = blkid_partlist_numof_partitions(pl); | |
273 | if (n == z + 1) | |
274 | break; | |
275 | if (n > z + 1) { | |
276 | log_debug("blkid and kernel partition list do not match."); | |
277 | return -EIO; | |
278 | } | |
279 | if (n < z + 1) { | |
280 | unsigned j; | |
281 | ||
282 | /* The kernel has probed fewer partitions than blkid? Maybe the kernel prober is still running | |
283 | * or it got EBUSY because udev already opened the device. Let's reprobe the device, which is a | |
284 | * synchronous call that waits until probing is complete. */ | |
285 | ||
286 | for (j = 0; j < 20; j++) { | |
287 | ||
288 | r = ioctl(fd, BLKRRPART, 0); | |
289 | if (r < 0) | |
290 | r = -errno; | |
291 | if (r >= 0 || r != -EBUSY) | |
292 | break; | |
293 | ||
294 | /* If something else has the device open, such as an udev rule, the ioctl will return | |
295 | * EBUSY. Since there's no way to wait until it isn't busy anymore, let's just wait a | |
296 | * bit, and try again. | |
297 | * | |
298 | * This is really something they should fix in the kernel! */ | |
299 | ||
300 | usleep(50 * USEC_PER_MSEC); | |
301 | } | |
302 | ||
303 | if (r < 0) | |
304 | return r; | |
305 | } | |
306 | ||
307 | e = udev_enumerate_unref(e); | |
308 | } | |
309 | ||
310 | first = udev_enumerate_get_list_entry(e); | |
311 | udev_list_entry_foreach(item, first) { | |
312 | _cleanup_udev_device_unref_ struct udev_device *q; | |
9b6deb03 | 313 | unsigned long long pflags; |
8c1be37e LP |
314 | blkid_partition pp; |
315 | const char *node; | |
316 | dev_t qn; | |
317 | int nr; | |
318 | ||
319 | q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); | |
320 | if (!q) | |
321 | return -errno; | |
322 | ||
323 | qn = udev_device_get_devnum(q); | |
324 | if (major(qn) == 0) | |
325 | continue; | |
326 | ||
327 | if (st.st_rdev == qn) | |
328 | continue; | |
329 | ||
330 | node = udev_device_get_devnode(q); | |
331 | if (!node) | |
332 | continue; | |
333 | ||
334 | pp = blkid_partlist_devno_to_partition(pl, qn); | |
335 | if (!pp) | |
336 | continue; | |
337 | ||
9b6deb03 | 338 | pflags = blkid_partition_get_flags(pp); |
8c1be37e LP |
339 | |
340 | nr = blkid_partition_get_partno(pp); | |
341 | if (nr < 0) | |
342 | continue; | |
343 | ||
344 | if (is_gpt) { | |
345 | int designator = _PARTITION_DESIGNATOR_INVALID, architecture = _ARCHITECTURE_INVALID; | |
4623e8e6 LP |
346 | const char *stype, *sid, *fstype = NULL; |
347 | sd_id128_t type_id, id; | |
8c1be37e LP |
348 | bool rw = true; |
349 | ||
9b6deb03 | 350 | if (pflags & GPT_FLAG_NO_AUTO) |
8c1be37e LP |
351 | continue; |
352 | ||
4623e8e6 LP |
353 | sid = blkid_partition_get_uuid(pp); |
354 | if (!sid) | |
355 | continue; | |
356 | if (sd_id128_from_string(sid, &id) < 0) | |
357 | continue; | |
358 | ||
8c1be37e LP |
359 | stype = blkid_partition_get_type_string(pp); |
360 | if (!stype) | |
361 | continue; | |
8c1be37e LP |
362 | if (sd_id128_from_string(stype, &type_id) < 0) |
363 | continue; | |
364 | ||
365 | if (sd_id128_equal(type_id, GPT_HOME)) { | |
366 | designator = PARTITION_HOME; | |
9b6deb03 | 367 | rw = !(pflags & GPT_FLAG_READ_ONLY); |
8c1be37e LP |
368 | } else if (sd_id128_equal(type_id, GPT_SRV)) { |
369 | designator = PARTITION_SRV; | |
9b6deb03 | 370 | rw = !(pflags & GPT_FLAG_READ_ONLY); |
8c1be37e LP |
371 | } else if (sd_id128_equal(type_id, GPT_ESP)) { |
372 | designator = PARTITION_ESP; | |
373 | fstype = "vfat"; | |
374 | } | |
375 | #ifdef GPT_ROOT_NATIVE | |
376 | else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) { | |
4623e8e6 LP |
377 | |
378 | /* If a root ID is specified, ignore everything but the root id */ | |
379 | if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id)) | |
380 | continue; | |
381 | ||
8c1be37e LP |
382 | designator = PARTITION_ROOT; |
383 | architecture = native_architecture(); | |
9b6deb03 | 384 | rw = !(pflags & GPT_FLAG_READ_ONLY); |
4f8b86e3 | 385 | } else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE_VERITY)) { |
4623e8e6 LP |
386 | |
387 | m->can_verity = true; | |
388 | ||
389 | /* Ignore verity unless a root hash is specified */ | |
390 | if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id)) | |
391 | continue; | |
392 | ||
393 | designator = PARTITION_ROOT_VERITY; | |
394 | fstype = "DM_verity_hash"; | |
395 | architecture = native_architecture(); | |
396 | rw = false; | |
397 | } | |
398 | #endif | |
8c1be37e LP |
399 | #ifdef GPT_ROOT_SECONDARY |
400 | else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) { | |
4623e8e6 LP |
401 | |
402 | /* If a root ID is specified, ignore everything but the root id */ | |
403 | if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id)) | |
404 | continue; | |
405 | ||
8c1be37e LP |
406 | designator = PARTITION_ROOT_SECONDARY; |
407 | architecture = SECONDARY_ARCHITECTURE; | |
9b6deb03 | 408 | rw = !(pflags & GPT_FLAG_READ_ONLY); |
4f8b86e3 | 409 | } else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY_VERITY)) { |
4623e8e6 LP |
410 | m->can_verity = true; |
411 | ||
412 | /* Ignore verity unless root has is specified */ | |
413 | if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id)) | |
414 | continue; | |
415 | ||
416 | designator = PARTITION_ROOT_SECONDARY_VERITY; | |
417 | fstype = "DM_verity_hash"; | |
418 | architecture = SECONDARY_ARCHITECTURE; | |
419 | rw = false; | |
420 | } | |
8c1be37e LP |
421 | #endif |
422 | else if (sd_id128_equal(type_id, GPT_SWAP)) { | |
423 | designator = PARTITION_SWAP; | |
424 | fstype = "swap"; | |
425 | } else if (sd_id128_equal(type_id, GPT_LINUX_GENERIC)) { | |
426 | ||
427 | if (generic_node) | |
428 | multiple_generic = true; | |
429 | else { | |
430 | generic_nr = nr; | |
9b6deb03 | 431 | generic_rw = !(pflags & GPT_FLAG_READ_ONLY); |
be30ad41 | 432 | generic_uuid = id; |
8c1be37e LP |
433 | generic_node = strdup(node); |
434 | if (!generic_node) | |
435 | return -ENOMEM; | |
436 | } | |
437 | } | |
438 | ||
439 | if (designator != _PARTITION_DESIGNATOR_INVALID) { | |
440 | _cleanup_free_ char *t = NULL, *n = NULL; | |
441 | ||
442 | /* First one wins */ | |
443 | if (m->partitions[designator].found) | |
444 | continue; | |
445 | ||
446 | if (fstype) { | |
447 | t = strdup(fstype); | |
448 | if (!t) | |
449 | return -ENOMEM; | |
450 | } | |
451 | ||
452 | n = strdup(node); | |
453 | if (!n) | |
454 | return -ENOMEM; | |
455 | ||
456 | m->partitions[designator] = (DissectedPartition) { | |
457 | .found = true, | |
458 | .partno = nr, | |
459 | .rw = rw, | |
460 | .architecture = architecture, | |
461 | .node = n, | |
462 | .fstype = t, | |
be30ad41 | 463 | .uuid = id, |
8c1be37e LP |
464 | }; |
465 | ||
466 | n = t = NULL; | |
467 | } | |
468 | ||
469 | } else if (is_mbr) { | |
470 | ||
9b6deb03 | 471 | if (pflags != 0x80) /* Bootable flag */ |
8c1be37e LP |
472 | continue; |
473 | ||
474 | if (blkid_partition_get_type(pp) != 0x83) /* Linux partition */ | |
475 | continue; | |
476 | ||
477 | if (generic_node) | |
478 | multiple_generic = true; | |
479 | else { | |
480 | generic_nr = nr; | |
481 | generic_rw = true; | |
482 | generic_node = strdup(node); | |
483 | if (!generic_node) | |
484 | return -ENOMEM; | |
485 | } | |
486 | } | |
487 | } | |
488 | ||
489 | if (!m->partitions[PARTITION_ROOT].found) { | |
490 | /* No root partition found? Then let's see if ther's one for the secondary architecture. And if not | |
491 | * either, then check if there's a single generic one, and use that. */ | |
492 | ||
4623e8e6 | 493 | if (m->partitions[PARTITION_ROOT_VERITY].found) |
e0f9e7bd | 494 | return -EADDRNOTAVAIL; |
4623e8e6 | 495 | |
8c1be37e LP |
496 | if (m->partitions[PARTITION_ROOT_SECONDARY].found) { |
497 | m->partitions[PARTITION_ROOT] = m->partitions[PARTITION_ROOT_SECONDARY]; | |
498 | zero(m->partitions[PARTITION_ROOT_SECONDARY]); | |
4623e8e6 LP |
499 | |
500 | m->partitions[PARTITION_ROOT_VERITY] = m->partitions[PARTITION_ROOT_SECONDARY_VERITY]; | |
501 | zero(m->partitions[PARTITION_ROOT_SECONDARY_VERITY]); | |
502 | ||
e0f9e7bd LP |
503 | } else if (flags & DISSECT_IMAGE_REQUIRE_ROOT) { |
504 | ||
505 | /* If the root has was set, then we won't fallback to a generic node, because the root hash | |
506 | * decides */ | |
507 | if (root_hash) | |
508 | return -EADDRNOTAVAIL; | |
8c1be37e | 509 | |
e0f9e7bd LP |
510 | /* If we didn't find a generic node, then we can't fix this up either */ |
511 | if (!generic_node) | |
512 | return -ENXIO; | |
513 | ||
514 | /* If we didn't find a properly marked root partition, but we did find a single suitable | |
515 | * generic Linux partition, then use this as root partition, if the caller asked for it. */ | |
8c1be37e LP |
516 | if (multiple_generic) |
517 | return -ENOTUNIQ; | |
518 | ||
519 | m->partitions[PARTITION_ROOT] = (DissectedPartition) { | |
520 | .found = true, | |
521 | .rw = generic_rw, | |
522 | .partno = generic_nr, | |
523 | .architecture = _ARCHITECTURE_INVALID, | |
524 | .node = generic_node, | |
be30ad41 | 525 | .uuid = generic_uuid, |
8c1be37e LP |
526 | }; |
527 | ||
528 | generic_node = NULL; | |
e0f9e7bd | 529 | } |
8c1be37e LP |
530 | } |
531 | ||
4623e8e6 | 532 | if (root_hash) { |
e0f9e7bd | 533 | if (!m->partitions[PARTITION_ROOT_VERITY].found || !m->partitions[PARTITION_ROOT].found) |
4623e8e6 LP |
534 | return -EADDRNOTAVAIL; |
535 | ||
536 | /* If we found the primary root with the hash, then we definitely want to suppress any secondary root | |
537 | * (which would be weird, after all the root hash should only be assigned to one pair of | |
538 | * partitions... */ | |
539 | m->partitions[PARTITION_ROOT_SECONDARY].found = false; | |
540 | m->partitions[PARTITION_ROOT_SECONDARY_VERITY].found = false; | |
541 | ||
542 | /* If we found a verity setup, then the root partition is necessarily read-only. */ | |
543 | m->partitions[PARTITION_ROOT].rw = false; | |
544 | ||
545 | m->verity = true; | |
546 | } | |
547 | ||
18b5886e LP |
548 | blkid_free_probe(b); |
549 | b = NULL; | |
550 | ||
8c1be37e LP |
551 | /* Fill in file system types if we don't know them yet. */ |
552 | for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) { | |
18b5886e | 553 | DissectedPartition *p = m->partitions + i; |
8c1be37e | 554 | |
18b5886e | 555 | if (!p->found) |
8c1be37e LP |
556 | continue; |
557 | ||
18b5886e LP |
558 | if (!p->fstype && p->node) { |
559 | r = probe_filesystem(p->node, &p->fstype); | |
560 | if (r < 0) | |
561 | return r; | |
8c1be37e LP |
562 | } |
563 | ||
18b5886e LP |
564 | if (streq_ptr(p->fstype, "crypto_LUKS")) |
565 | m->encrypted = true; | |
8c1be37e LP |
566 | } |
567 | ||
568 | *ret = m; | |
569 | m = NULL; | |
570 | ||
571 | return 0; | |
572 | #else | |
573 | return -EOPNOTSUPP; | |
574 | #endif | |
575 | } | |
576 | ||
577 | DissectedImage* dissected_image_unref(DissectedImage *m) { | |
578 | unsigned i; | |
579 | ||
580 | if (!m) | |
581 | return NULL; | |
582 | ||
583 | for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) { | |
584 | free(m->partitions[i].fstype); | |
585 | free(m->partitions[i].node); | |
18b5886e LP |
586 | free(m->partitions[i].decrypted_fstype); |
587 | free(m->partitions[i].decrypted_node); | |
8c1be37e LP |
588 | } |
589 | ||
590 | free(m); | |
591 | return NULL; | |
592 | } | |
593 | ||
18b5886e LP |
594 | static int is_loop_device(const char *path) { |
595 | char s[strlen("/sys/dev/block/") + DECIMAL_STR_MAX(dev_t) + 1 + DECIMAL_STR_MAX(dev_t) + strlen("/../loop/")]; | |
596 | struct stat st; | |
597 | ||
598 | assert(path); | |
599 | ||
600 | if (stat(path, &st) < 0) | |
601 | return -errno; | |
602 | ||
603 | if (!S_ISBLK(st.st_mode)) | |
604 | return -ENOTBLK; | |
605 | ||
606 | xsprintf(s, "/sys/dev/block/%u:%u/loop/", major(st.st_rdev), minor(st.st_rdev)); | |
607 | if (access(s, F_OK) < 0) { | |
608 | if (errno != ENOENT) | |
609 | return -errno; | |
610 | ||
611 | /* The device itself isn't a loop device, but maybe it's a partition and its parent is? */ | |
612 | xsprintf(s, "/sys/dev/block/%u:%u/../loop/", major(st.st_rdev), minor(st.st_rdev)); | |
613 | if (access(s, F_OK) < 0) | |
614 | return errno == ENOENT ? false : -errno; | |
615 | } | |
616 | ||
617 | return true; | |
618 | } | |
619 | ||
620 | static int mount_partition( | |
621 | DissectedPartition *m, | |
622 | const char *where, | |
623 | const char *directory, | |
624 | DissectImageFlags flags) { | |
625 | ||
626 | const char *p, *options = NULL, *node, *fstype; | |
8c1be37e LP |
627 | bool rw; |
628 | ||
629 | assert(m); | |
630 | assert(where); | |
631 | ||
18b5886e LP |
632 | node = m->decrypted_node ?: m->node; |
633 | fstype = m->decrypted_fstype ?: m->fstype; | |
634 | ||
635 | if (!m->found || !node || !fstype) | |
8c1be37e LP |
636 | return 0; |
637 | ||
18b5886e LP |
638 | /* Stacked encryption? Yuck */ |
639 | if (streq_ptr(fstype, "crypto_LUKS")) | |
640 | return -ELOOP; | |
641 | ||
642 | rw = m->rw && !(flags & DISSECT_IMAGE_READ_ONLY); | |
8c1be37e LP |
643 | |
644 | if (directory) | |
645 | p = strjoina(where, directory); | |
646 | else | |
647 | p = where; | |
648 | ||
18b5886e LP |
649 | /* If requested, turn on discard support. */ |
650 | if (STR_IN_SET(fstype, "btrfs", "ext4", "vfat", "xfs") && | |
651 | ((flags & DISSECT_IMAGE_DISCARD) || | |
652 | ((flags & DISSECT_IMAGE_DISCARD_ON_LOOP) && is_loop_device(m->node)))) | |
653 | options = "discard"; | |
8c1be37e | 654 | |
18b5886e | 655 | return mount_verbose(LOG_DEBUG, node, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), options); |
8c1be37e LP |
656 | } |
657 | ||
18b5886e | 658 | int dissected_image_mount(DissectedImage *m, const char *where, DissectImageFlags flags) { |
8c1be37e LP |
659 | int r; |
660 | ||
661 | assert(m); | |
662 | assert(where); | |
663 | ||
664 | if (!m->partitions[PARTITION_ROOT].found) | |
665 | return -ENXIO; | |
666 | ||
667 | r = mount_partition(m->partitions + PARTITION_ROOT, where, NULL, flags); | |
668 | if (r < 0) | |
669 | return r; | |
670 | ||
671 | r = mount_partition(m->partitions + PARTITION_HOME, where, "/home", flags); | |
672 | if (r < 0) | |
673 | return r; | |
674 | ||
675 | r = mount_partition(m->partitions + PARTITION_SRV, where, "/srv", flags); | |
676 | if (r < 0) | |
677 | return r; | |
678 | ||
679 | if (m->partitions[PARTITION_ESP].found) { | |
680 | const char *mp, *x; | |
681 | ||
682 | /* Mount the ESP to /efi if it exists and is empty. If it doesn't exist, use /boot instead. */ | |
683 | ||
684 | mp = "/efi"; | |
685 | x = strjoina(where, mp); | |
686 | r = dir_is_empty(x); | |
687 | if (r == -ENOENT) { | |
688 | mp = "/boot"; | |
689 | x = strjoina(where, mp); | |
690 | r = dir_is_empty(x); | |
691 | } | |
692 | if (r > 0) { | |
693 | r = mount_partition(m->partitions + PARTITION_ESP, where, mp, flags); | |
694 | if (r < 0) | |
695 | return r; | |
696 | } | |
697 | } | |
698 | ||
699 | return 0; | |
700 | } | |
701 | ||
18b5886e LP |
702 | #ifdef HAVE_LIBCRYPTSETUP |
703 | typedef struct DecryptedPartition { | |
704 | struct crypt_device *device; | |
705 | char *name; | |
706 | bool relinquished; | |
707 | } DecryptedPartition; | |
708 | ||
709 | struct DecryptedImage { | |
710 | DecryptedPartition *decrypted; | |
711 | size_t n_decrypted; | |
712 | size_t n_allocated; | |
713 | }; | |
714 | #endif | |
715 | ||
716 | DecryptedImage* decrypted_image_unref(DecryptedImage* d) { | |
717 | #ifdef HAVE_LIBCRYPTSETUP | |
718 | size_t i; | |
719 | int r; | |
720 | ||
721 | if (!d) | |
722 | return NULL; | |
723 | ||
724 | for (i = 0; i < d->n_decrypted; i++) { | |
725 | DecryptedPartition *p = d->decrypted + i; | |
726 | ||
727 | if (p->device && p->name && !p->relinquished) { | |
728 | r = crypt_deactivate(p->device, p->name); | |
729 | if (r < 0) | |
730 | log_debug_errno(r, "Failed to deactivate encrypted partition %s", p->name); | |
731 | } | |
732 | ||
733 | if (p->device) | |
734 | crypt_free(p->device); | |
735 | free(p->name); | |
736 | } | |
737 | ||
738 | free(d); | |
739 | #endif | |
740 | return NULL; | |
741 | } | |
742 | ||
743 | #ifdef HAVE_LIBCRYPTSETUP | |
4623e8e6 LP |
744 | |
745 | static int make_dm_name_and_node(const void *original_node, const char *suffix, char **ret_name, char **ret_node) { | |
746 | _cleanup_free_ char *name = NULL, *node = NULL; | |
747 | const char *base; | |
748 | ||
749 | assert(original_node); | |
750 | assert(suffix); | |
751 | assert(ret_name); | |
752 | assert(ret_node); | |
753 | ||
754 | base = strrchr(original_node, '/'); | |
755 | if (!base) | |
756 | return -EINVAL; | |
757 | base++; | |
758 | if (isempty(base)) | |
759 | return -EINVAL; | |
760 | ||
761 | name = strjoin(base, suffix); | |
762 | if (!name) | |
763 | return -ENOMEM; | |
764 | if (!filename_is_valid(name)) | |
765 | return -EINVAL; | |
766 | ||
767 | node = strjoin(crypt_get_dir(), "/", name); | |
768 | if (!node) | |
769 | return -ENOMEM; | |
770 | ||
771 | *ret_name = name; | |
772 | *ret_node = node; | |
773 | ||
774 | name = node = NULL; | |
775 | return 0; | |
776 | } | |
777 | ||
18b5886e LP |
778 | static int decrypt_partition( |
779 | DissectedPartition *m, | |
780 | const char *passphrase, | |
781 | DissectImageFlags flags, | |
782 | DecryptedImage *d) { | |
783 | ||
784 | _cleanup_free_ char *node = NULL, *name = NULL; | |
785 | struct crypt_device *cd; | |
18b5886e LP |
786 | int r; |
787 | ||
788 | assert(m); | |
789 | assert(d); | |
790 | ||
791 | if (!m->found || !m->node || !m->fstype) | |
792 | return 0; | |
793 | ||
794 | if (!streq(m->fstype, "crypto_LUKS")) | |
795 | return 0; | |
796 | ||
4623e8e6 LP |
797 | r = make_dm_name_and_node(m->node, "-decrypted", &name, &node); |
798 | if (r < 0) | |
799 | return r; | |
18b5886e LP |
800 | |
801 | if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1)) | |
802 | return -ENOMEM; | |
803 | ||
804 | r = crypt_init(&cd, m->node); | |
805 | if (r < 0) | |
806 | return r; | |
807 | ||
808 | r = crypt_load(cd, CRYPT_LUKS1, NULL); | |
809 | if (r < 0) | |
810 | goto fail; | |
811 | ||
812 | r = crypt_activate_by_passphrase(cd, name, CRYPT_ANY_SLOT, passphrase, strlen(passphrase), | |
813 | ((flags & DISSECT_IMAGE_READ_ONLY) ? CRYPT_ACTIVATE_READONLY : 0) | | |
814 | ((flags & DISSECT_IMAGE_DISCARD_ON_CRYPTO) ? CRYPT_ACTIVATE_ALLOW_DISCARDS : 0)); | |
815 | if (r == -EPERM) { | |
816 | r = -EKEYREJECTED; | |
817 | goto fail; | |
818 | } | |
819 | if (r < 0) | |
820 | goto fail; | |
821 | ||
822 | d->decrypted[d->n_decrypted].name = name; | |
823 | name = NULL; | |
824 | ||
825 | d->decrypted[d->n_decrypted].device = cd; | |
826 | d->n_decrypted++; | |
827 | ||
828 | m->decrypted_node = node; | |
829 | node = NULL; | |
830 | ||
831 | return 0; | |
832 | ||
4623e8e6 LP |
833 | fail: |
834 | crypt_free(cd); | |
835 | return r; | |
836 | } | |
837 | ||
838 | static int verity_partition( | |
839 | DissectedPartition *m, | |
840 | DissectedPartition *v, | |
841 | const void *root_hash, | |
842 | size_t root_hash_size, | |
843 | DissectImageFlags flags, | |
844 | DecryptedImage *d) { | |
845 | ||
846 | _cleanup_free_ char *node = NULL, *name = NULL; | |
847 | struct crypt_device *cd; | |
848 | int r; | |
849 | ||
850 | assert(m); | |
851 | assert(v); | |
852 | ||
853 | if (!root_hash) | |
854 | return 0; | |
855 | ||
856 | if (!m->found || !m->node || !m->fstype) | |
857 | return 0; | |
858 | if (!v->found || !v->node || !v->fstype) | |
859 | return 0; | |
860 | ||
861 | if (!streq(v->fstype, "DM_verity_hash")) | |
862 | return 0; | |
863 | ||
864 | r = make_dm_name_and_node(m->node, "-verity", &name, &node); | |
865 | if (r < 0) | |
866 | return r; | |
867 | ||
868 | if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1)) | |
869 | return -ENOMEM; | |
870 | ||
871 | r = crypt_init(&cd, v->node); | |
872 | if (r < 0) | |
873 | return r; | |
874 | ||
875 | r = crypt_load(cd, CRYPT_VERITY, NULL); | |
876 | if (r < 0) | |
877 | goto fail; | |
878 | ||
879 | r = crypt_set_data_device(cd, m->node); | |
880 | if (r < 0) | |
881 | goto fail; | |
882 | ||
883 | r = crypt_activate_by_volume_key(cd, name, root_hash, root_hash_size, CRYPT_ACTIVATE_READONLY); | |
884 | if (r < 0) | |
885 | goto fail; | |
886 | ||
887 | d->decrypted[d->n_decrypted].name = name; | |
888 | name = NULL; | |
889 | ||
890 | d->decrypted[d->n_decrypted].device = cd; | |
891 | d->n_decrypted++; | |
892 | ||
893 | m->decrypted_node = node; | |
894 | node = NULL; | |
895 | ||
896 | return 0; | |
897 | ||
18b5886e LP |
898 | fail: |
899 | crypt_free(cd); | |
900 | return r; | |
901 | } | |
902 | #endif | |
903 | ||
904 | int dissected_image_decrypt( | |
905 | DissectedImage *m, | |
906 | const char *passphrase, | |
4623e8e6 LP |
907 | const void *root_hash, |
908 | size_t root_hash_size, | |
18b5886e LP |
909 | DissectImageFlags flags, |
910 | DecryptedImage **ret) { | |
911 | ||
912 | _cleanup_(decrypted_image_unrefp) DecryptedImage *d = NULL; | |
913 | #ifdef HAVE_LIBCRYPTSETUP | |
914 | unsigned i; | |
915 | int r; | |
916 | #endif | |
917 | ||
918 | assert(m); | |
4623e8e6 | 919 | assert(root_hash || root_hash_size == 0); |
18b5886e LP |
920 | |
921 | /* Returns: | |
922 | * | |
923 | * = 0 → There was nothing to decrypt | |
924 | * > 0 → Decrypted successfully | |
925 | * -ENOKEY → There's some to decrypt but no key was supplied | |
926 | * -EKEYREJECTED → Passed key was not correct | |
927 | */ | |
928 | ||
4623e8e6 LP |
929 | if (root_hash && root_hash_size < sizeof(sd_id128_t)) |
930 | return -EINVAL; | |
931 | ||
932 | if (!m->encrypted && !m->verity) { | |
18b5886e LP |
933 | *ret = NULL; |
934 | return 0; | |
935 | } | |
936 | ||
937 | #ifdef HAVE_LIBCRYPTSETUP | |
4623e8e6 | 938 | if (m->encrypted && !passphrase) |
18b5886e LP |
939 | return -ENOKEY; |
940 | ||
941 | d = new0(DecryptedImage, 1); | |
942 | if (!d) | |
943 | return -ENOMEM; | |
944 | ||
945 | for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) { | |
946 | DissectedPartition *p = m->partitions + i; | |
4623e8e6 | 947 | int k; |
18b5886e LP |
948 | |
949 | if (!p->found) | |
950 | continue; | |
951 | ||
952 | r = decrypt_partition(p, passphrase, flags, d); | |
953 | if (r < 0) | |
954 | return r; | |
955 | ||
4623e8e6 LP |
956 | k = PARTITION_VERITY_OF(i); |
957 | if (k >= 0) { | |
958 | r = verity_partition(p, m->partitions + k, root_hash, root_hash_size, flags, d); | |
959 | if (r < 0) | |
960 | return r; | |
961 | } | |
962 | ||
18b5886e LP |
963 | if (!p->decrypted_fstype && p->decrypted_node) { |
964 | r = probe_filesystem(p->decrypted_node, &p->decrypted_fstype); | |
965 | if (r < 0) | |
966 | return r; | |
967 | } | |
968 | } | |
969 | ||
970 | *ret = d; | |
971 | d = NULL; | |
972 | ||
973 | return 1; | |
974 | #else | |
975 | return -EOPNOTSUPP; | |
976 | #endif | |
977 | } | |
978 | ||
979 | int dissected_image_decrypt_interactively( | |
980 | DissectedImage *m, | |
981 | const char *passphrase, | |
4623e8e6 LP |
982 | const void *root_hash, |
983 | size_t root_hash_size, | |
18b5886e LP |
984 | DissectImageFlags flags, |
985 | DecryptedImage **ret) { | |
986 | ||
987 | _cleanup_strv_free_erase_ char **z = NULL; | |
988 | int n = 3, r; | |
989 | ||
990 | if (passphrase) | |
991 | n--; | |
992 | ||
993 | for (;;) { | |
4623e8e6 | 994 | r = dissected_image_decrypt(m, passphrase, root_hash, root_hash_size, flags, ret); |
18b5886e LP |
995 | if (r >= 0) |
996 | return r; | |
997 | if (r == -EKEYREJECTED) | |
998 | log_error_errno(r, "Incorrect passphrase, try again!"); | |
999 | else if (r != -ENOKEY) { | |
1000 | log_error_errno(r, "Failed to decrypt image: %m"); | |
1001 | return r; | |
1002 | } | |
1003 | ||
1004 | if (--n < 0) { | |
1005 | log_error("Too many retries."); | |
1006 | return -EKEYREJECTED; | |
1007 | } | |
1008 | ||
1009 | z = strv_free(z); | |
1010 | ||
1011 | r = ask_password_auto("Please enter image passphrase!", NULL, "dissect", "dissect", USEC_INFINITY, 0, &z); | |
1012 | if (r < 0) | |
1013 | return log_error_errno(r, "Failed to query for passphrase: %m"); | |
1014 | ||
1015 | passphrase = z[0]; | |
1016 | } | |
1017 | } | |
1018 | ||
1019 | #ifdef HAVE_LIBCRYPTSETUP | |
1020 | static int deferred_remove(DecryptedPartition *p) { | |
1021 | ||
1022 | struct dm_ioctl dm = { | |
1023 | .version = { | |
1024 | DM_VERSION_MAJOR, | |
1025 | DM_VERSION_MINOR, | |
1026 | DM_VERSION_PATCHLEVEL | |
1027 | }, | |
1028 | .data_size = sizeof(dm), | |
1029 | .flags = DM_DEFERRED_REMOVE, | |
1030 | }; | |
1031 | ||
1032 | _cleanup_close_ int fd = -1; | |
1033 | ||
1034 | assert(p); | |
1035 | ||
1036 | /* Unfortunately, libcryptsetup doesn't provide a proper API for this, hence call the ioctl() directly. */ | |
1037 | ||
1038 | fd = open("/dev/mapper/control", O_RDWR|O_CLOEXEC); | |
1039 | if (fd < 0) | |
1040 | return -errno; | |
1041 | ||
1042 | strncpy(dm.name, p->name, sizeof(dm.name)); | |
1043 | ||
1044 | if (ioctl(fd, DM_DEV_REMOVE, &dm)) | |
1045 | return -errno; | |
1046 | ||
1047 | return 0; | |
1048 | } | |
1049 | #endif | |
1050 | ||
1051 | int decrypted_image_relinquish(DecryptedImage *d) { | |
1052 | ||
1053 | #ifdef HAVE_LIBCRYPTSETUP | |
1054 | size_t i; | |
1055 | int r; | |
1056 | #endif | |
1057 | ||
1058 | assert(d); | |
1059 | ||
1060 | /* Turns on automatic removal after the last use ended for all DM devices of this image, and sets a boolean so | |
1061 | * that we don't clean it up ourselves either anymore */ | |
1062 | ||
1063 | #ifdef HAVE_LIBCRYPTSETUP | |
1064 | for (i = 0; i < d->n_decrypted; i++) { | |
1065 | DecryptedPartition *p = d->decrypted + i; | |
1066 | ||
1067 | if (p->relinquished) | |
1068 | continue; | |
1069 | ||
1070 | r = deferred_remove(p); | |
1071 | if (r < 0) | |
1072 | return log_debug_errno(r, "Failed to mark %s for auto-removal: %m", p->name); | |
1073 | ||
1074 | p->relinquished = true; | |
1075 | } | |
1076 | #endif | |
1077 | ||
1078 | return 0; | |
1079 | } | |
1080 | ||
8c1be37e LP |
1081 | static const char *const partition_designator_table[] = { |
1082 | [PARTITION_ROOT] = "root", | |
1083 | [PARTITION_ROOT_SECONDARY] = "root-secondary", | |
1084 | [PARTITION_HOME] = "home", | |
1085 | [PARTITION_SRV] = "srv", | |
1086 | [PARTITION_ESP] = "esp", | |
1087 | [PARTITION_SWAP] = "swap", | |
4623e8e6 LP |
1088 | [PARTITION_ROOT_VERITY] = "root-verity", |
1089 | [PARTITION_ROOT_SECONDARY_VERITY] = "root-secondary-verity", | |
8c1be37e LP |
1090 | }; |
1091 | ||
1092 | DEFINE_STRING_TABLE_LOOKUP(partition_designator, int); |