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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 | ||
349cc4a5 | 20 | #if HAVE_LIBCRYPTSETUP |
18b5886e LP |
21 | #include <libcryptsetup.h> |
22 | #endif | |
8c1be37e LP |
23 | #include <sys/mount.h> |
24 | ||
25 | #include "architecture.h" | |
18b5886e | 26 | #include "ask-password-api.h" |
8c1be37e LP |
27 | #include "blkid-util.h" |
28 | #include "dissect-image.h" | |
18b5886e | 29 | #include "fd-util.h" |
78ebe980 | 30 | #include "fileio.h" |
2eedfd2d | 31 | #include "fs-util.h" |
8c1be37e | 32 | #include "gpt.h" |
78ebe980 | 33 | #include "hexdecoct.h" |
dcce98a4 | 34 | #include "linux-3.13/dm-ioctl.h" |
8c1be37e LP |
35 | #include "mount-util.h" |
36 | #include "path-util.h" | |
37 | #include "stat-util.h" | |
18b5886e | 38 | #include "stdio-util.h" |
8c1be37e LP |
39 | #include "string-table.h" |
40 | #include "string-util.h" | |
2eedfd2d | 41 | #include "strv.h" |
8c1be37e | 42 | #include "udev-util.h" |
41488e1f | 43 | #include "xattr-util.h" |
8c1be37e | 44 | |
d1c536f5 | 45 | _unused_ static int probe_filesystem(const char *node, char **ret_fstype) { |
349cc4a5 | 46 | #if HAVE_BLKID |
18b5886e LP |
47 | _cleanup_blkid_free_probe_ blkid_probe b = NULL; |
48 | const char *fstype; | |
49 | int r; | |
50 | ||
51 | b = blkid_new_probe_from_filename(node); | |
52 | if (!b) | |
53 | return -ENOMEM; | |
54 | ||
55 | blkid_probe_enable_superblocks(b, 1); | |
56 | blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE); | |
57 | ||
58 | errno = 0; | |
59 | r = blkid_do_safeprobe(b); | |
4c701096 | 60 | if (IN_SET(r, -2, 1)) { |
18b5886e LP |
61 | log_debug("Failed to identify any partition type on partition %s", node); |
62 | goto not_found; | |
63 | } | |
b382db9f ZJS |
64 | if (r != 0) |
65 | return -errno ?: -EIO; | |
18b5886e LP |
66 | |
67 | (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL); | |
68 | ||
69 | if (fstype) { | |
70 | char *t; | |
71 | ||
72 | t = strdup(fstype); | |
73 | if (!t) | |
74 | return -ENOMEM; | |
75 | ||
76 | *ret_fstype = t; | |
77 | return 1; | |
78 | } | |
79 | ||
80 | not_found: | |
81 | *ret_fstype = NULL; | |
82 | return 0; | |
d1c536f5 ZJS |
83 | #else |
84 | return -EOPNOTSUPP; | |
a75e27eb | 85 | #endif |
d1c536f5 | 86 | } |
18b5886e | 87 | |
9b6deb03 | 88 | int dissect_image(int fd, const void *root_hash, size_t root_hash_size, DissectImageFlags flags, DissectedImage **ret) { |
8c1be37e | 89 | |
349cc4a5 | 90 | #if HAVE_BLKID |
4623e8e6 | 91 | sd_id128_t root_uuid = SD_ID128_NULL, verity_uuid = SD_ID128_NULL; |
8c1be37e LP |
92 | _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; |
93 | bool is_gpt, is_mbr, generic_rw, multiple_generic = false; | |
94 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; | |
95 | _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL; | |
96 | _cleanup_blkid_free_probe_ blkid_probe b = NULL; | |
97 | _cleanup_udev_unref_ struct udev *udev = NULL; | |
98 | _cleanup_free_ char *generic_node = NULL; | |
be30ad41 | 99 | sd_id128_t generic_uuid = SD_ID128_NULL; |
9b6deb03 | 100 | const char *pttype = NULL; |
8c1be37e LP |
101 | struct udev_list_entry *first, *item; |
102 | blkid_partlist pl; | |
103 | int r, generic_nr; | |
104 | struct stat st; | |
105 | unsigned i; | |
106 | ||
107 | assert(fd >= 0); | |
108 | assert(ret); | |
4623e8e6 | 109 | assert(root_hash || root_hash_size == 0); |
8c1be37e LP |
110 | |
111 | /* Probes a disk image, and returns information about what it found in *ret. | |
112 | * | |
4623e8e6 LP |
113 | * Returns -ENOPKG if no suitable partition table or file system could be found. |
114 | * Returns -EADDRNOTAVAIL if a root hash was specified but no matching root/verity partitions found. */ | |
115 | ||
116 | if (root_hash) { | |
117 | /* If a root hash is supplied, then we use the root partition that has a UUID that match the first | |
118 | * 128bit of the root hash. And we use the verity partition that has a UUID that match the final | |
119 | * 128bit. */ | |
120 | ||
121 | if (root_hash_size < sizeof(sd_id128_t)) | |
122 | return -EINVAL; | |
123 | ||
124 | memcpy(&root_uuid, root_hash, sizeof(sd_id128_t)); | |
125 | memcpy(&verity_uuid, (const uint8_t*) root_hash + root_hash_size - sizeof(sd_id128_t), sizeof(sd_id128_t)); | |
126 | ||
127 | if (sd_id128_is_null(root_uuid)) | |
128 | return -EINVAL; | |
129 | if (sd_id128_is_null(verity_uuid)) | |
130 | return -EINVAL; | |
131 | } | |
8c1be37e LP |
132 | |
133 | if (fstat(fd, &st) < 0) | |
134 | return -errno; | |
135 | ||
136 | if (!S_ISBLK(st.st_mode)) | |
137 | return -ENOTBLK; | |
138 | ||
139 | b = blkid_new_probe(); | |
140 | if (!b) | |
141 | return -ENOMEM; | |
142 | ||
143 | errno = 0; | |
144 | r = blkid_probe_set_device(b, fd, 0, 0); | |
b382db9f ZJS |
145 | if (r != 0) |
146 | return -errno ?: -ENOMEM; | |
8c1be37e | 147 | |
9b6deb03 LP |
148 | if ((flags & DISSECT_IMAGE_GPT_ONLY) == 0) { |
149 | /* Look for file system superblocks, unless we only shall look for GPT partition tables */ | |
150 | blkid_probe_enable_superblocks(b, 1); | |
151 | blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE|BLKID_SUBLKS_USAGE); | |
152 | } | |
153 | ||
8c1be37e LP |
154 | blkid_probe_enable_partitions(b, 1); |
155 | blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS); | |
156 | ||
157 | errno = 0; | |
158 | r = blkid_do_safeprobe(b); | |
4c701096 | 159 | if (IN_SET(r, -2, 1)) { |
8c1be37e LP |
160 | log_debug("Failed to identify any partition table."); |
161 | return -ENOPKG; | |
162 | } | |
b382db9f ZJS |
163 | if (r != 0) |
164 | return -errno ?: -EIO; | |
8c1be37e LP |
165 | |
166 | m = new0(DissectedImage, 1); | |
167 | if (!m) | |
168 | return -ENOMEM; | |
169 | ||
e0f9e7bd LP |
170 | if (!(flags & DISSECT_IMAGE_GPT_ONLY) && |
171 | (flags & DISSECT_IMAGE_REQUIRE_ROOT)) { | |
9b6deb03 | 172 | const char *usage = NULL; |
8c1be37e | 173 | |
9b6deb03 LP |
174 | (void) blkid_probe_lookup_value(b, "USAGE", &usage, NULL); |
175 | if (STRPTR_IN_SET(usage, "filesystem", "crypto")) { | |
176 | _cleanup_free_ char *t = NULL, *n = NULL; | |
177 | const char *fstype = NULL; | |
8c1be37e | 178 | |
9b6deb03 LP |
179 | /* OK, we have found a file system, that's our root partition then. */ |
180 | (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL); | |
8c1be37e | 181 | |
9b6deb03 LP |
182 | if (fstype) { |
183 | t = strdup(fstype); | |
184 | if (!t) | |
185 | return -ENOMEM; | |
186 | } | |
187 | ||
188 | if (asprintf(&n, "/dev/block/%u:%u", major(st.st_rdev), minor(st.st_rdev)) < 0) | |
189 | return -ENOMEM; | |
8c1be37e | 190 | |
9b6deb03 LP |
191 | m->partitions[PARTITION_ROOT] = (DissectedPartition) { |
192 | .found = true, | |
193 | .rw = true, | |
194 | .partno = -1, | |
195 | .architecture = _ARCHITECTURE_INVALID, | |
196 | .fstype = t, | |
197 | .node = n, | |
198 | }; | |
8c1be37e | 199 | |
9b6deb03 | 200 | t = n = NULL; |
8c1be37e | 201 | |
9b6deb03 | 202 | m->encrypted = streq(fstype, "crypto_LUKS"); |
18b5886e | 203 | |
9b6deb03 LP |
204 | *ret = m; |
205 | m = NULL; | |
8c1be37e | 206 | |
9b6deb03 LP |
207 | return 0; |
208 | } | |
8c1be37e LP |
209 | } |
210 | ||
211 | (void) blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL); | |
212 | if (!pttype) | |
213 | return -ENOPKG; | |
214 | ||
215 | is_gpt = streq_ptr(pttype, "gpt"); | |
216 | is_mbr = streq_ptr(pttype, "dos"); | |
217 | ||
9b6deb03 | 218 | if (!is_gpt && ((flags & DISSECT_IMAGE_GPT_ONLY) || !is_mbr)) |
8c1be37e LP |
219 | return -ENOPKG; |
220 | ||
221 | errno = 0; | |
222 | pl = blkid_probe_get_partitions(b); | |
b382db9f ZJS |
223 | if (!pl) |
224 | return -errno ?: -ENOMEM; | |
8c1be37e LP |
225 | |
226 | udev = udev_new(); | |
227 | if (!udev) | |
228 | return -errno; | |
229 | ||
230 | d = udev_device_new_from_devnum(udev, 'b', st.st_rdev); | |
231 | if (!d) | |
232 | return -ENOMEM; | |
233 | ||
234 | for (i = 0;; i++) { | |
235 | int n, z; | |
236 | ||
237 | if (i >= 10) { | |
238 | log_debug("Kernel partitions never appeared."); | |
239 | return -ENXIO; | |
240 | } | |
241 | ||
242 | e = udev_enumerate_new(udev); | |
243 | if (!e) | |
244 | return -errno; | |
245 | ||
246 | r = udev_enumerate_add_match_parent(e, d); | |
247 | if (r < 0) | |
248 | return r; | |
249 | ||
250 | r = udev_enumerate_scan_devices(e); | |
251 | if (r < 0) | |
252 | return r; | |
253 | ||
254 | /* Count the partitions enumerated by the kernel */ | |
255 | n = 0; | |
256 | first = udev_enumerate_get_list_entry(e); | |
257 | udev_list_entry_foreach(item, first) | |
258 | n++; | |
259 | ||
260 | /* Count the partitions enumerated by blkid */ | |
261 | z = blkid_partlist_numof_partitions(pl); | |
262 | if (n == z + 1) | |
263 | break; | |
264 | if (n > z + 1) { | |
265 | log_debug("blkid and kernel partition list do not match."); | |
266 | return -EIO; | |
267 | } | |
268 | if (n < z + 1) { | |
269 | unsigned j; | |
270 | ||
271 | /* The kernel has probed fewer partitions than blkid? Maybe the kernel prober is still running | |
272 | * or it got EBUSY because udev already opened the device. Let's reprobe the device, which is a | |
273 | * synchronous call that waits until probing is complete. */ | |
274 | ||
275 | for (j = 0; j < 20; j++) { | |
276 | ||
277 | r = ioctl(fd, BLKRRPART, 0); | |
278 | if (r < 0) | |
279 | r = -errno; | |
280 | if (r >= 0 || r != -EBUSY) | |
281 | break; | |
282 | ||
283 | /* If something else has the device open, such as an udev rule, the ioctl will return | |
284 | * EBUSY. Since there's no way to wait until it isn't busy anymore, let's just wait a | |
285 | * bit, and try again. | |
286 | * | |
287 | * This is really something they should fix in the kernel! */ | |
288 | ||
289 | usleep(50 * USEC_PER_MSEC); | |
290 | } | |
291 | ||
292 | if (r < 0) | |
293 | return r; | |
294 | } | |
295 | ||
296 | e = udev_enumerate_unref(e); | |
297 | } | |
298 | ||
299 | first = udev_enumerate_get_list_entry(e); | |
300 | udev_list_entry_foreach(item, first) { | |
301 | _cleanup_udev_device_unref_ struct udev_device *q; | |
9b6deb03 | 302 | unsigned long long pflags; |
8c1be37e | 303 | blkid_partition pp; |
7be1420f | 304 | const char *node, *sysname; |
8c1be37e LP |
305 | dev_t qn; |
306 | int nr; | |
307 | ||
308 | q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); | |
309 | if (!q) | |
310 | return -errno; | |
311 | ||
312 | qn = udev_device_get_devnum(q); | |
313 | if (major(qn) == 0) | |
314 | continue; | |
315 | ||
316 | if (st.st_rdev == qn) | |
317 | continue; | |
318 | ||
7be1420f LP |
319 | /* Filter out weird MMC RPMB partitions, which cannot reasonably be read, see |
320 | * https://github.com/systemd/systemd/issues/5806 */ | |
321 | sysname = udev_device_get_sysname(q); | |
322 | if (sysname && startswith(sysname, "mmcblk") && endswith(sysname, "rpmb")) | |
323 | continue; | |
324 | ||
8c1be37e LP |
325 | node = udev_device_get_devnode(q); |
326 | if (!node) | |
327 | continue; | |
328 | ||
329 | pp = blkid_partlist_devno_to_partition(pl, qn); | |
330 | if (!pp) | |
331 | continue; | |
332 | ||
9b6deb03 | 333 | pflags = blkid_partition_get_flags(pp); |
8c1be37e LP |
334 | |
335 | nr = blkid_partition_get_partno(pp); | |
336 | if (nr < 0) | |
337 | continue; | |
338 | ||
339 | if (is_gpt) { | |
340 | int designator = _PARTITION_DESIGNATOR_INVALID, architecture = _ARCHITECTURE_INVALID; | |
4623e8e6 LP |
341 | const char *stype, *sid, *fstype = NULL; |
342 | sd_id128_t type_id, id; | |
8c1be37e LP |
343 | bool rw = true; |
344 | ||
4623e8e6 LP |
345 | sid = blkid_partition_get_uuid(pp); |
346 | if (!sid) | |
347 | continue; | |
348 | if (sd_id128_from_string(sid, &id) < 0) | |
349 | continue; | |
350 | ||
8c1be37e LP |
351 | stype = blkid_partition_get_type_string(pp); |
352 | if (!stype) | |
353 | continue; | |
8c1be37e LP |
354 | if (sd_id128_from_string(stype, &type_id) < 0) |
355 | continue; | |
356 | ||
357 | if (sd_id128_equal(type_id, GPT_HOME)) { | |
a48dd347 LP |
358 | |
359 | if (pflags & GPT_FLAG_NO_AUTO) | |
360 | continue; | |
361 | ||
8c1be37e | 362 | designator = PARTITION_HOME; |
9b6deb03 | 363 | rw = !(pflags & GPT_FLAG_READ_ONLY); |
8c1be37e | 364 | } else if (sd_id128_equal(type_id, GPT_SRV)) { |
a48dd347 LP |
365 | |
366 | if (pflags & GPT_FLAG_NO_AUTO) | |
367 | continue; | |
368 | ||
8c1be37e | 369 | designator = PARTITION_SRV; |
9b6deb03 | 370 | rw = !(pflags & GPT_FLAG_READ_ONLY); |
8c1be37e | 371 | } else if (sd_id128_equal(type_id, GPT_ESP)) { |
a48dd347 LP |
372 | |
373 | /* Note that we don't check the GPT_FLAG_NO_AUTO flag for the ESP, as it is not defined | |
374 | * there. We instead check the GPT_FLAG_NO_BLOCK_IO_PROTOCOL, as recommended by the | |
375 | * UEFI spec (See "12.3.3 Number and Location of System Partitions"). */ | |
376 | ||
377 | if (pflags & GPT_FLAG_NO_BLOCK_IO_PROTOCOL) | |
378 | continue; | |
379 | ||
8c1be37e LP |
380 | designator = PARTITION_ESP; |
381 | fstype = "vfat"; | |
382 | } | |
383 | #ifdef GPT_ROOT_NATIVE | |
384 | else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) { | |
4623e8e6 | 385 | |
a48dd347 LP |
386 | if (pflags & GPT_FLAG_NO_AUTO) |
387 | continue; | |
388 | ||
4623e8e6 LP |
389 | /* If a root ID is specified, ignore everything but the root id */ |
390 | if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id)) | |
391 | continue; | |
392 | ||
8c1be37e LP |
393 | designator = PARTITION_ROOT; |
394 | architecture = native_architecture(); | |
9b6deb03 | 395 | rw = !(pflags & GPT_FLAG_READ_ONLY); |
4f8b86e3 | 396 | } else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE_VERITY)) { |
4623e8e6 | 397 | |
a48dd347 LP |
398 | if (pflags & GPT_FLAG_NO_AUTO) |
399 | continue; | |
400 | ||
4623e8e6 LP |
401 | m->can_verity = true; |
402 | ||
403 | /* Ignore verity unless a root hash is specified */ | |
404 | if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id)) | |
405 | continue; | |
406 | ||
407 | designator = PARTITION_ROOT_VERITY; | |
408 | fstype = "DM_verity_hash"; | |
409 | architecture = native_architecture(); | |
410 | rw = false; | |
411 | } | |
412 | #endif | |
8c1be37e LP |
413 | #ifdef GPT_ROOT_SECONDARY |
414 | else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) { | |
4623e8e6 | 415 | |
a48dd347 LP |
416 | if (pflags & GPT_FLAG_NO_AUTO) |
417 | continue; | |
418 | ||
4623e8e6 LP |
419 | /* If a root ID is specified, ignore everything but the root id */ |
420 | if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id)) | |
421 | continue; | |
422 | ||
8c1be37e LP |
423 | designator = PARTITION_ROOT_SECONDARY; |
424 | architecture = SECONDARY_ARCHITECTURE; | |
9b6deb03 | 425 | rw = !(pflags & GPT_FLAG_READ_ONLY); |
4f8b86e3 | 426 | } else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY_VERITY)) { |
a48dd347 LP |
427 | |
428 | if (pflags & GPT_FLAG_NO_AUTO) | |
429 | continue; | |
430 | ||
4623e8e6 LP |
431 | m->can_verity = true; |
432 | ||
433 | /* Ignore verity unless root has is specified */ | |
434 | if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id)) | |
435 | continue; | |
436 | ||
437 | designator = PARTITION_ROOT_SECONDARY_VERITY; | |
438 | fstype = "DM_verity_hash"; | |
439 | architecture = SECONDARY_ARCHITECTURE; | |
440 | rw = false; | |
441 | } | |
8c1be37e LP |
442 | #endif |
443 | else if (sd_id128_equal(type_id, GPT_SWAP)) { | |
a48dd347 LP |
444 | |
445 | if (pflags & GPT_FLAG_NO_AUTO) | |
446 | continue; | |
447 | ||
8c1be37e LP |
448 | designator = PARTITION_SWAP; |
449 | fstype = "swap"; | |
450 | } else if (sd_id128_equal(type_id, GPT_LINUX_GENERIC)) { | |
451 | ||
a48dd347 LP |
452 | if (pflags & GPT_FLAG_NO_AUTO) |
453 | continue; | |
454 | ||
8c1be37e LP |
455 | if (generic_node) |
456 | multiple_generic = true; | |
457 | else { | |
458 | generic_nr = nr; | |
9b6deb03 | 459 | generic_rw = !(pflags & GPT_FLAG_READ_ONLY); |
be30ad41 | 460 | generic_uuid = id; |
8c1be37e LP |
461 | generic_node = strdup(node); |
462 | if (!generic_node) | |
463 | return -ENOMEM; | |
464 | } | |
465 | } | |
466 | ||
467 | if (designator != _PARTITION_DESIGNATOR_INVALID) { | |
468 | _cleanup_free_ char *t = NULL, *n = NULL; | |
469 | ||
470 | /* First one wins */ | |
471 | if (m->partitions[designator].found) | |
472 | continue; | |
473 | ||
474 | if (fstype) { | |
475 | t = strdup(fstype); | |
476 | if (!t) | |
477 | return -ENOMEM; | |
478 | } | |
479 | ||
480 | n = strdup(node); | |
481 | if (!n) | |
482 | return -ENOMEM; | |
483 | ||
484 | m->partitions[designator] = (DissectedPartition) { | |
485 | .found = true, | |
486 | .partno = nr, | |
487 | .rw = rw, | |
488 | .architecture = architecture, | |
489 | .node = n, | |
490 | .fstype = t, | |
be30ad41 | 491 | .uuid = id, |
8c1be37e LP |
492 | }; |
493 | ||
494 | n = t = NULL; | |
495 | } | |
496 | ||
497 | } else if (is_mbr) { | |
498 | ||
9b6deb03 | 499 | if (pflags != 0x80) /* Bootable flag */ |
8c1be37e LP |
500 | continue; |
501 | ||
502 | if (blkid_partition_get_type(pp) != 0x83) /* Linux partition */ | |
503 | continue; | |
504 | ||
505 | if (generic_node) | |
506 | multiple_generic = true; | |
507 | else { | |
508 | generic_nr = nr; | |
509 | generic_rw = true; | |
510 | generic_node = strdup(node); | |
511 | if (!generic_node) | |
512 | return -ENOMEM; | |
513 | } | |
514 | } | |
515 | } | |
516 | ||
517 | if (!m->partitions[PARTITION_ROOT].found) { | |
518 | /* No root partition found? Then let's see if ther's one for the secondary architecture. And if not | |
519 | * either, then check if there's a single generic one, and use that. */ | |
520 | ||
4623e8e6 | 521 | if (m->partitions[PARTITION_ROOT_VERITY].found) |
e0f9e7bd | 522 | return -EADDRNOTAVAIL; |
4623e8e6 | 523 | |
8c1be37e LP |
524 | if (m->partitions[PARTITION_ROOT_SECONDARY].found) { |
525 | m->partitions[PARTITION_ROOT] = m->partitions[PARTITION_ROOT_SECONDARY]; | |
526 | zero(m->partitions[PARTITION_ROOT_SECONDARY]); | |
4623e8e6 LP |
527 | |
528 | m->partitions[PARTITION_ROOT_VERITY] = m->partitions[PARTITION_ROOT_SECONDARY_VERITY]; | |
529 | zero(m->partitions[PARTITION_ROOT_SECONDARY_VERITY]); | |
530 | ||
e0f9e7bd LP |
531 | } else if (flags & DISSECT_IMAGE_REQUIRE_ROOT) { |
532 | ||
533 | /* If the root has was set, then we won't fallback to a generic node, because the root hash | |
534 | * decides */ | |
535 | if (root_hash) | |
536 | return -EADDRNOTAVAIL; | |
8c1be37e | 537 | |
e0f9e7bd LP |
538 | /* If we didn't find a generic node, then we can't fix this up either */ |
539 | if (!generic_node) | |
540 | return -ENXIO; | |
541 | ||
542 | /* If we didn't find a properly marked root partition, but we did find a single suitable | |
543 | * generic Linux partition, then use this as root partition, if the caller asked for it. */ | |
8c1be37e LP |
544 | if (multiple_generic) |
545 | return -ENOTUNIQ; | |
546 | ||
547 | m->partitions[PARTITION_ROOT] = (DissectedPartition) { | |
548 | .found = true, | |
549 | .rw = generic_rw, | |
550 | .partno = generic_nr, | |
551 | .architecture = _ARCHITECTURE_INVALID, | |
552 | .node = generic_node, | |
be30ad41 | 553 | .uuid = generic_uuid, |
8c1be37e LP |
554 | }; |
555 | ||
556 | generic_node = NULL; | |
e0f9e7bd | 557 | } |
8c1be37e LP |
558 | } |
559 | ||
4623e8e6 | 560 | if (root_hash) { |
e0f9e7bd | 561 | if (!m->partitions[PARTITION_ROOT_VERITY].found || !m->partitions[PARTITION_ROOT].found) |
4623e8e6 LP |
562 | return -EADDRNOTAVAIL; |
563 | ||
564 | /* If we found the primary root with the hash, then we definitely want to suppress any secondary root | |
565 | * (which would be weird, after all the root hash should only be assigned to one pair of | |
566 | * partitions... */ | |
567 | m->partitions[PARTITION_ROOT_SECONDARY].found = false; | |
568 | m->partitions[PARTITION_ROOT_SECONDARY_VERITY].found = false; | |
569 | ||
570 | /* If we found a verity setup, then the root partition is necessarily read-only. */ | |
571 | m->partitions[PARTITION_ROOT].rw = false; | |
572 | ||
573 | m->verity = true; | |
574 | } | |
575 | ||
18b5886e LP |
576 | blkid_free_probe(b); |
577 | b = NULL; | |
578 | ||
8c1be37e LP |
579 | /* Fill in file system types if we don't know them yet. */ |
580 | for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) { | |
18b5886e | 581 | DissectedPartition *p = m->partitions + i; |
8c1be37e | 582 | |
18b5886e | 583 | if (!p->found) |
8c1be37e LP |
584 | continue; |
585 | ||
18b5886e LP |
586 | if (!p->fstype && p->node) { |
587 | r = probe_filesystem(p->node, &p->fstype); | |
588 | if (r < 0) | |
589 | return r; | |
8c1be37e LP |
590 | } |
591 | ||
18b5886e LP |
592 | if (streq_ptr(p->fstype, "crypto_LUKS")) |
593 | m->encrypted = true; | |
896f937f LP |
594 | |
595 | if (p->fstype && fstype_is_ro(p->fstype)) | |
596 | p->rw = false; | |
8c1be37e LP |
597 | } |
598 | ||
599 | *ret = m; | |
600 | m = NULL; | |
601 | ||
602 | return 0; | |
603 | #else | |
604 | return -EOPNOTSUPP; | |
605 | #endif | |
606 | } | |
607 | ||
608 | DissectedImage* dissected_image_unref(DissectedImage *m) { | |
609 | unsigned i; | |
610 | ||
611 | if (!m) | |
612 | return NULL; | |
613 | ||
614 | for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) { | |
615 | free(m->partitions[i].fstype); | |
616 | free(m->partitions[i].node); | |
18b5886e LP |
617 | free(m->partitions[i].decrypted_fstype); |
618 | free(m->partitions[i].decrypted_node); | |
8c1be37e LP |
619 | } |
620 | ||
621 | free(m); | |
622 | return NULL; | |
623 | } | |
624 | ||
18b5886e LP |
625 | static int is_loop_device(const char *path) { |
626 | char s[strlen("/sys/dev/block/") + DECIMAL_STR_MAX(dev_t) + 1 + DECIMAL_STR_MAX(dev_t) + strlen("/../loop/")]; | |
627 | struct stat st; | |
628 | ||
629 | assert(path); | |
630 | ||
631 | if (stat(path, &st) < 0) | |
632 | return -errno; | |
633 | ||
634 | if (!S_ISBLK(st.st_mode)) | |
635 | return -ENOTBLK; | |
636 | ||
637 | xsprintf(s, "/sys/dev/block/%u:%u/loop/", major(st.st_rdev), minor(st.st_rdev)); | |
638 | if (access(s, F_OK) < 0) { | |
639 | if (errno != ENOENT) | |
640 | return -errno; | |
641 | ||
642 | /* The device itself isn't a loop device, but maybe it's a partition and its parent is? */ | |
643 | xsprintf(s, "/sys/dev/block/%u:%u/../loop/", major(st.st_rdev), minor(st.st_rdev)); | |
644 | if (access(s, F_OK) < 0) | |
645 | return errno == ENOENT ? false : -errno; | |
646 | } | |
647 | ||
648 | return true; | |
649 | } | |
650 | ||
651 | static int mount_partition( | |
652 | DissectedPartition *m, | |
653 | const char *where, | |
654 | const char *directory, | |
655 | DissectImageFlags flags) { | |
656 | ||
657 | const char *p, *options = NULL, *node, *fstype; | |
2eedfd2d | 658 | _cleanup_free_ char *chased = NULL; |
8c1be37e | 659 | bool rw; |
2eedfd2d | 660 | int r; |
8c1be37e LP |
661 | |
662 | assert(m); | |
663 | assert(where); | |
664 | ||
18b5886e LP |
665 | node = m->decrypted_node ?: m->node; |
666 | fstype = m->decrypted_fstype ?: m->fstype; | |
667 | ||
668 | if (!m->found || !node || !fstype) | |
8c1be37e LP |
669 | return 0; |
670 | ||
18b5886e LP |
671 | /* Stacked encryption? Yuck */ |
672 | if (streq_ptr(fstype, "crypto_LUKS")) | |
673 | return -ELOOP; | |
674 | ||
675 | rw = m->rw && !(flags & DISSECT_IMAGE_READ_ONLY); | |
8c1be37e | 676 | |
2eedfd2d LP |
677 | if (directory) { |
678 | r = chase_symlinks(directory, where, CHASE_PREFIX_ROOT, &chased); | |
679 | if (r < 0) | |
680 | return r; | |
681 | ||
682 | p = chased; | |
683 | } else | |
8c1be37e LP |
684 | p = where; |
685 | ||
18b5886e | 686 | /* If requested, turn on discard support. */ |
154d2269 | 687 | if (fstype_can_discard(fstype) && |
18b5886e LP |
688 | ((flags & DISSECT_IMAGE_DISCARD) || |
689 | ((flags & DISSECT_IMAGE_DISCARD_ON_LOOP) && is_loop_device(m->node)))) | |
690 | options = "discard"; | |
8c1be37e | 691 | |
18b5886e | 692 | return mount_verbose(LOG_DEBUG, node, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), options); |
8c1be37e LP |
693 | } |
694 | ||
18b5886e | 695 | int dissected_image_mount(DissectedImage *m, const char *where, DissectImageFlags flags) { |
8c1be37e LP |
696 | int r; |
697 | ||
698 | assert(m); | |
699 | assert(where); | |
700 | ||
701 | if (!m->partitions[PARTITION_ROOT].found) | |
702 | return -ENXIO; | |
703 | ||
704 | r = mount_partition(m->partitions + PARTITION_ROOT, where, NULL, flags); | |
705 | if (r < 0) | |
706 | return r; | |
707 | ||
708 | r = mount_partition(m->partitions + PARTITION_HOME, where, "/home", flags); | |
709 | if (r < 0) | |
710 | return r; | |
711 | ||
712 | r = mount_partition(m->partitions + PARTITION_SRV, where, "/srv", flags); | |
713 | if (r < 0) | |
714 | return r; | |
715 | ||
716 | if (m->partitions[PARTITION_ESP].found) { | |
2eedfd2d | 717 | const char *mp; |
8c1be37e LP |
718 | |
719 | /* Mount the ESP to /efi if it exists and is empty. If it doesn't exist, use /boot instead. */ | |
720 | ||
2eedfd2d LP |
721 | FOREACH_STRING(mp, "/efi", "/boot") { |
722 | _cleanup_free_ char *p = NULL; | |
723 | ||
724 | r = chase_symlinks(mp, where, CHASE_PREFIX_ROOT, &p); | |
8c1be37e | 725 | if (r < 0) |
2eedfd2d LP |
726 | continue; |
727 | ||
728 | r = dir_is_empty(p); | |
729 | if (r > 0) { | |
730 | r = mount_partition(m->partitions + PARTITION_ESP, where, mp, flags); | |
731 | if (r < 0) | |
732 | return r; | |
733 | } | |
8c1be37e LP |
734 | } |
735 | } | |
736 | ||
737 | return 0; | |
738 | } | |
739 | ||
349cc4a5 | 740 | #if HAVE_LIBCRYPTSETUP |
18b5886e LP |
741 | typedef struct DecryptedPartition { |
742 | struct crypt_device *device; | |
743 | char *name; | |
744 | bool relinquished; | |
745 | } DecryptedPartition; | |
746 | ||
747 | struct DecryptedImage { | |
748 | DecryptedPartition *decrypted; | |
749 | size_t n_decrypted; | |
750 | size_t n_allocated; | |
751 | }; | |
752 | #endif | |
753 | ||
754 | DecryptedImage* decrypted_image_unref(DecryptedImage* d) { | |
349cc4a5 | 755 | #if HAVE_LIBCRYPTSETUP |
18b5886e LP |
756 | size_t i; |
757 | int r; | |
758 | ||
759 | if (!d) | |
760 | return NULL; | |
761 | ||
762 | for (i = 0; i < d->n_decrypted; i++) { | |
763 | DecryptedPartition *p = d->decrypted + i; | |
764 | ||
765 | if (p->device && p->name && !p->relinquished) { | |
766 | r = crypt_deactivate(p->device, p->name); | |
767 | if (r < 0) | |
768 | log_debug_errno(r, "Failed to deactivate encrypted partition %s", p->name); | |
769 | } | |
770 | ||
771 | if (p->device) | |
772 | crypt_free(p->device); | |
773 | free(p->name); | |
774 | } | |
775 | ||
776 | free(d); | |
777 | #endif | |
778 | return NULL; | |
779 | } | |
780 | ||
349cc4a5 | 781 | #if HAVE_LIBCRYPTSETUP |
4623e8e6 LP |
782 | |
783 | static int make_dm_name_and_node(const void *original_node, const char *suffix, char **ret_name, char **ret_node) { | |
784 | _cleanup_free_ char *name = NULL, *node = NULL; | |
785 | const char *base; | |
786 | ||
787 | assert(original_node); | |
788 | assert(suffix); | |
789 | assert(ret_name); | |
790 | assert(ret_node); | |
791 | ||
792 | base = strrchr(original_node, '/'); | |
793 | if (!base) | |
794 | return -EINVAL; | |
795 | base++; | |
796 | if (isempty(base)) | |
797 | return -EINVAL; | |
798 | ||
799 | name = strjoin(base, suffix); | |
800 | if (!name) | |
801 | return -ENOMEM; | |
802 | if (!filename_is_valid(name)) | |
803 | return -EINVAL; | |
804 | ||
805 | node = strjoin(crypt_get_dir(), "/", name); | |
806 | if (!node) | |
807 | return -ENOMEM; | |
808 | ||
809 | *ret_name = name; | |
810 | *ret_node = node; | |
811 | ||
812 | name = node = NULL; | |
813 | return 0; | |
814 | } | |
815 | ||
18b5886e LP |
816 | static int decrypt_partition( |
817 | DissectedPartition *m, | |
818 | const char *passphrase, | |
819 | DissectImageFlags flags, | |
820 | DecryptedImage *d) { | |
821 | ||
822 | _cleanup_free_ char *node = NULL, *name = NULL; | |
823 | struct crypt_device *cd; | |
18b5886e LP |
824 | int r; |
825 | ||
826 | assert(m); | |
827 | assert(d); | |
828 | ||
829 | if (!m->found || !m->node || !m->fstype) | |
830 | return 0; | |
831 | ||
832 | if (!streq(m->fstype, "crypto_LUKS")) | |
833 | return 0; | |
834 | ||
4623e8e6 LP |
835 | r = make_dm_name_and_node(m->node, "-decrypted", &name, &node); |
836 | if (r < 0) | |
837 | return r; | |
18b5886e LP |
838 | |
839 | if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1)) | |
840 | return -ENOMEM; | |
841 | ||
842 | r = crypt_init(&cd, m->node); | |
843 | if (r < 0) | |
715cbb81 | 844 | return log_debug_errno(r, "Failed to initialize dm-crypt: %m"); |
18b5886e LP |
845 | |
846 | r = crypt_load(cd, CRYPT_LUKS1, NULL); | |
715cbb81 LP |
847 | if (r < 0) { |
848 | log_debug_errno(r, "Failed to load LUKS metadata: %m"); | |
18b5886e | 849 | goto fail; |
715cbb81 | 850 | } |
18b5886e LP |
851 | |
852 | r = crypt_activate_by_passphrase(cd, name, CRYPT_ANY_SLOT, passphrase, strlen(passphrase), | |
853 | ((flags & DISSECT_IMAGE_READ_ONLY) ? CRYPT_ACTIVATE_READONLY : 0) | | |
854 | ((flags & DISSECT_IMAGE_DISCARD_ON_CRYPTO) ? CRYPT_ACTIVATE_ALLOW_DISCARDS : 0)); | |
715cbb81 LP |
855 | if (r < 0) |
856 | log_debug_errno(r, "Failed to activate LUKS device: %m"); | |
18b5886e LP |
857 | if (r == -EPERM) { |
858 | r = -EKEYREJECTED; | |
859 | goto fail; | |
860 | } | |
861 | if (r < 0) | |
862 | goto fail; | |
863 | ||
864 | d->decrypted[d->n_decrypted].name = name; | |
865 | name = NULL; | |
866 | ||
867 | d->decrypted[d->n_decrypted].device = cd; | |
868 | d->n_decrypted++; | |
869 | ||
870 | m->decrypted_node = node; | |
871 | node = NULL; | |
872 | ||
873 | return 0; | |
874 | ||
4623e8e6 LP |
875 | fail: |
876 | crypt_free(cd); | |
877 | return r; | |
878 | } | |
879 | ||
880 | static int verity_partition( | |
881 | DissectedPartition *m, | |
882 | DissectedPartition *v, | |
883 | const void *root_hash, | |
884 | size_t root_hash_size, | |
885 | DissectImageFlags flags, | |
886 | DecryptedImage *d) { | |
887 | ||
888 | _cleanup_free_ char *node = NULL, *name = NULL; | |
889 | struct crypt_device *cd; | |
890 | int r; | |
891 | ||
892 | assert(m); | |
893 | assert(v); | |
894 | ||
895 | if (!root_hash) | |
896 | return 0; | |
897 | ||
898 | if (!m->found || !m->node || !m->fstype) | |
899 | return 0; | |
900 | if (!v->found || !v->node || !v->fstype) | |
901 | return 0; | |
902 | ||
903 | if (!streq(v->fstype, "DM_verity_hash")) | |
904 | return 0; | |
905 | ||
906 | r = make_dm_name_and_node(m->node, "-verity", &name, &node); | |
907 | if (r < 0) | |
908 | return r; | |
909 | ||
910 | if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1)) | |
911 | return -ENOMEM; | |
912 | ||
913 | r = crypt_init(&cd, v->node); | |
914 | if (r < 0) | |
915 | return r; | |
916 | ||
917 | r = crypt_load(cd, CRYPT_VERITY, NULL); | |
918 | if (r < 0) | |
919 | goto fail; | |
920 | ||
921 | r = crypt_set_data_device(cd, m->node); | |
922 | if (r < 0) | |
923 | goto fail; | |
924 | ||
925 | r = crypt_activate_by_volume_key(cd, name, root_hash, root_hash_size, CRYPT_ACTIVATE_READONLY); | |
926 | if (r < 0) | |
927 | goto fail; | |
928 | ||
929 | d->decrypted[d->n_decrypted].name = name; | |
930 | name = NULL; | |
931 | ||
932 | d->decrypted[d->n_decrypted].device = cd; | |
933 | d->n_decrypted++; | |
934 | ||
935 | m->decrypted_node = node; | |
936 | node = NULL; | |
937 | ||
938 | return 0; | |
939 | ||
18b5886e LP |
940 | fail: |
941 | crypt_free(cd); | |
942 | return r; | |
943 | } | |
944 | #endif | |
945 | ||
946 | int dissected_image_decrypt( | |
947 | DissectedImage *m, | |
948 | const char *passphrase, | |
4623e8e6 LP |
949 | const void *root_hash, |
950 | size_t root_hash_size, | |
18b5886e LP |
951 | DissectImageFlags flags, |
952 | DecryptedImage **ret) { | |
953 | ||
954 | _cleanup_(decrypted_image_unrefp) DecryptedImage *d = NULL; | |
349cc4a5 | 955 | #if HAVE_LIBCRYPTSETUP |
18b5886e LP |
956 | unsigned i; |
957 | int r; | |
958 | #endif | |
959 | ||
960 | assert(m); | |
4623e8e6 | 961 | assert(root_hash || root_hash_size == 0); |
18b5886e LP |
962 | |
963 | /* Returns: | |
964 | * | |
965 | * = 0 → There was nothing to decrypt | |
966 | * > 0 → Decrypted successfully | |
d1c536f5 | 967 | * -ENOKEY → There's something to decrypt but no key was supplied |
18b5886e LP |
968 | * -EKEYREJECTED → Passed key was not correct |
969 | */ | |
970 | ||
4623e8e6 LP |
971 | if (root_hash && root_hash_size < sizeof(sd_id128_t)) |
972 | return -EINVAL; | |
973 | ||
974 | if (!m->encrypted && !m->verity) { | |
18b5886e LP |
975 | *ret = NULL; |
976 | return 0; | |
977 | } | |
978 | ||
349cc4a5 | 979 | #if HAVE_LIBCRYPTSETUP |
4623e8e6 | 980 | if (m->encrypted && !passphrase) |
18b5886e LP |
981 | return -ENOKEY; |
982 | ||
983 | d = new0(DecryptedImage, 1); | |
984 | if (!d) | |
985 | return -ENOMEM; | |
986 | ||
987 | for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) { | |
988 | DissectedPartition *p = m->partitions + i; | |
4623e8e6 | 989 | int k; |
18b5886e LP |
990 | |
991 | if (!p->found) | |
992 | continue; | |
993 | ||
994 | r = decrypt_partition(p, passphrase, flags, d); | |
995 | if (r < 0) | |
996 | return r; | |
997 | ||
4623e8e6 LP |
998 | k = PARTITION_VERITY_OF(i); |
999 | if (k >= 0) { | |
1000 | r = verity_partition(p, m->partitions + k, root_hash, root_hash_size, flags, d); | |
1001 | if (r < 0) | |
1002 | return r; | |
1003 | } | |
1004 | ||
18b5886e LP |
1005 | if (!p->decrypted_fstype && p->decrypted_node) { |
1006 | r = probe_filesystem(p->decrypted_node, &p->decrypted_fstype); | |
1007 | if (r < 0) | |
1008 | return r; | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | *ret = d; | |
1013 | d = NULL; | |
1014 | ||
1015 | return 1; | |
1016 | #else | |
1017 | return -EOPNOTSUPP; | |
1018 | #endif | |
1019 | } | |
1020 | ||
1021 | int dissected_image_decrypt_interactively( | |
1022 | DissectedImage *m, | |
1023 | const char *passphrase, | |
4623e8e6 LP |
1024 | const void *root_hash, |
1025 | size_t root_hash_size, | |
18b5886e LP |
1026 | DissectImageFlags flags, |
1027 | DecryptedImage **ret) { | |
1028 | ||
1029 | _cleanup_strv_free_erase_ char **z = NULL; | |
1030 | int n = 3, r; | |
1031 | ||
1032 | if (passphrase) | |
1033 | n--; | |
1034 | ||
1035 | for (;;) { | |
4623e8e6 | 1036 | r = dissected_image_decrypt(m, passphrase, root_hash, root_hash_size, flags, ret); |
18b5886e LP |
1037 | if (r >= 0) |
1038 | return r; | |
1039 | if (r == -EKEYREJECTED) | |
1040 | log_error_errno(r, "Incorrect passphrase, try again!"); | |
1041 | else if (r != -ENOKEY) { | |
1042 | log_error_errno(r, "Failed to decrypt image: %m"); | |
1043 | return r; | |
1044 | } | |
1045 | ||
1046 | if (--n < 0) { | |
1047 | log_error("Too many retries."); | |
1048 | return -EKEYREJECTED; | |
1049 | } | |
1050 | ||
1051 | z = strv_free(z); | |
1052 | ||
1053 | r = ask_password_auto("Please enter image passphrase!", NULL, "dissect", "dissect", USEC_INFINITY, 0, &z); | |
1054 | if (r < 0) | |
1055 | return log_error_errno(r, "Failed to query for passphrase: %m"); | |
1056 | ||
1057 | passphrase = z[0]; | |
1058 | } | |
1059 | } | |
1060 | ||
349cc4a5 | 1061 | #if HAVE_LIBCRYPTSETUP |
18b5886e LP |
1062 | static int deferred_remove(DecryptedPartition *p) { |
1063 | ||
1064 | struct dm_ioctl dm = { | |
1065 | .version = { | |
1066 | DM_VERSION_MAJOR, | |
1067 | DM_VERSION_MINOR, | |
1068 | DM_VERSION_PATCHLEVEL | |
1069 | }, | |
1070 | .data_size = sizeof(dm), | |
1071 | .flags = DM_DEFERRED_REMOVE, | |
1072 | }; | |
1073 | ||
1074 | _cleanup_close_ int fd = -1; | |
1075 | ||
1076 | assert(p); | |
1077 | ||
1078 | /* Unfortunately, libcryptsetup doesn't provide a proper API for this, hence call the ioctl() directly. */ | |
1079 | ||
1080 | fd = open("/dev/mapper/control", O_RDWR|O_CLOEXEC); | |
1081 | if (fd < 0) | |
1082 | return -errno; | |
1083 | ||
1084 | strncpy(dm.name, p->name, sizeof(dm.name)); | |
1085 | ||
1086 | if (ioctl(fd, DM_DEV_REMOVE, &dm)) | |
1087 | return -errno; | |
1088 | ||
1089 | return 0; | |
1090 | } | |
1091 | #endif | |
1092 | ||
1093 | int decrypted_image_relinquish(DecryptedImage *d) { | |
1094 | ||
349cc4a5 | 1095 | #if HAVE_LIBCRYPTSETUP |
18b5886e LP |
1096 | size_t i; |
1097 | int r; | |
1098 | #endif | |
1099 | ||
1100 | assert(d); | |
1101 | ||
1102 | /* Turns on automatic removal after the last use ended for all DM devices of this image, and sets a boolean so | |
1103 | * that we don't clean it up ourselves either anymore */ | |
1104 | ||
349cc4a5 | 1105 | #if HAVE_LIBCRYPTSETUP |
18b5886e LP |
1106 | for (i = 0; i < d->n_decrypted; i++) { |
1107 | DecryptedPartition *p = d->decrypted + i; | |
1108 | ||
1109 | if (p->relinquished) | |
1110 | continue; | |
1111 | ||
1112 | r = deferred_remove(p); | |
1113 | if (r < 0) | |
1114 | return log_debug_errno(r, "Failed to mark %s for auto-removal: %m", p->name); | |
1115 | ||
1116 | p->relinquished = true; | |
1117 | } | |
1118 | #endif | |
1119 | ||
1120 | return 0; | |
1121 | } | |
1122 | ||
78ebe980 LP |
1123 | int root_hash_load(const char *image, void **ret, size_t *ret_size) { |
1124 | _cleanup_free_ char *text = NULL; | |
1125 | _cleanup_free_ void *k = NULL; | |
78ebe980 LP |
1126 | size_t l; |
1127 | int r; | |
1128 | ||
1129 | assert(image); | |
1130 | assert(ret); | |
1131 | assert(ret_size); | |
1132 | ||
1133 | if (is_device_path(image)) { | |
1134 | /* If we are asked to load the root hash for a device node, exit early */ | |
1135 | *ret = NULL; | |
1136 | *ret_size = 0; | |
1137 | return 0; | |
1138 | } | |
1139 | ||
41488e1f LP |
1140 | r = getxattr_malloc(image, "user.verity.roothash", &text, true); |
1141 | if (r < 0) { | |
1142 | char *fn, *e, *n; | |
78ebe980 | 1143 | |
41488e1f LP |
1144 | if (!IN_SET(r, -ENODATA, -EOPNOTSUPP, -ENOENT)) |
1145 | return r; | |
78ebe980 | 1146 | |
41488e1f LP |
1147 | fn = newa(char, strlen(image) + strlen(".roothash") + 1); |
1148 | n = stpcpy(fn, image); | |
1149 | e = endswith(fn, ".raw"); | |
1150 | if (e) | |
1151 | n = e; | |
1152 | ||
1153 | strcpy(n, ".roothash"); | |
1154 | ||
1155 | r = read_one_line_file(fn, &text); | |
1156 | if (r == -ENOENT) { | |
1157 | *ret = NULL; | |
1158 | *ret_size = 0; | |
1159 | return 0; | |
1160 | } | |
1161 | if (r < 0) | |
1162 | return r; | |
78ebe980 | 1163 | } |
78ebe980 LP |
1164 | |
1165 | r = unhexmem(text, strlen(text), &k, &l); | |
1166 | if (r < 0) | |
1167 | return r; | |
1168 | if (l < sizeof(sd_id128_t)) | |
1169 | return -EINVAL; | |
1170 | ||
1171 | *ret = k; | |
1172 | *ret_size = l; | |
1173 | ||
1174 | k = NULL; | |
1175 | ||
1176 | return 1; | |
1177 | } | |
1178 | ||
8c1be37e LP |
1179 | static const char *const partition_designator_table[] = { |
1180 | [PARTITION_ROOT] = "root", | |
1181 | [PARTITION_ROOT_SECONDARY] = "root-secondary", | |
1182 | [PARTITION_HOME] = "home", | |
1183 | [PARTITION_SRV] = "srv", | |
1184 | [PARTITION_ESP] = "esp", | |
1185 | [PARTITION_SWAP] = "swap", | |
4623e8e6 LP |
1186 | [PARTITION_ROOT_VERITY] = "root-verity", |
1187 | [PARTITION_ROOT_SECONDARY_VERITY] = "root-secondary-verity", | |
8c1be37e LP |
1188 | }; |
1189 | ||
1190 | DEFINE_STRING_TABLE_LOOKUP(partition_designator, int); |