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dissect-image: try to open device node before activating
[thirdparty/systemd.git] / src / shared / dissect-image.c
CommitLineData
db9ecf05 1/* SPDX-License-Identifier: LGPL-2.1-or-later */
8c1be37e 2
10c1b188
LP		 3#if HAVE_VALGRIND_MEMCHECK_H
4#include <valgrind/memcheck.h>
5#endif
6
01234e1f
YW		 7#include <linux/dm-ioctl.h>
8#include <linux/loop.h>
19df770f 9#include <sys/file.h>
8c1be37e 10#include <sys/mount.h>
3b925504
LP		 11#include <sys/prctl.h>
12#include <sys/wait.h>
f5ea63a5 13#include <sysexits.h>
8c1be37e 14
c2fa92e7
LP		 15#if HAVE_OPENSSL
16#include <openssl/err.h>
17#include <openssl/pem.h>
18#include <openssl/x509.h>
19#endif
20
3c1f2cee 21#include "sd-device.h"
dccca82b
LP		 22#include "sd-id128.h"
23
8c1be37e 24#include "architecture.h"
18b5886e 25#include "ask-password-api.h"
8c1be37e 26#include "blkid-util.h"
18c528e9 27#include "blockdev-util.h"
f4351959 28#include "chase-symlinks.h"
c2fa92e7 29#include "conf-files.h"
3b925504 30#include "copy.h"
1e2f3230 31#include "cryptsetup-util.h"
3b925504 32#include "def.h"
553e15f2 33#include "device-nodes.h"
8437c059 34#include "device-util.h"
7718ac97 35#include "discover-image.h"
8c1be37e 36#include "dissect-image.h"
a709a315 37#include "dm-util.h"
686d13b9 38#include "env-file.h"
88b3300f 39#include "env-util.h"
93f59701 40#include "extension-release.h"
18b5886e 41#include "fd-util.h"
78ebe980 42#include "fileio.h"
2eedfd2d 43#include "fs-util.h"
cf32c486 44#include "fsck-util.h"
8c1be37e 45#include "gpt.h"
78ebe980 46#include "hexdecoct.h"
e2054217 47#include "hostname-setup.h"
3b925504 48#include "id128-util.h"
593fe6c0 49#include "import-util.h"
a4e0d617 50#include "io-util.h"
35cd0ba5 51#include "mkdir-label.h"
8c1be37e 52#include "mount-util.h"
e4de7287 53#include "mountpoint-util.h"
6aa05ebd 54#include "namespace-util.h"
d8b4d14d 55#include "nulstr-util.h"
c2fa92e7 56#include "openssl-util.h"
d58ad743 57#include "os-util.h"
8c1be37e 58#include "path-util.h"
3b925504
LP		 59#include "process-util.h"
60#include "raw-clone.h"
81939d9d 61#include "resize-fs.h"
3b925504 62#include "signal-util.h"
8c1be37e 63#include "stat-util.h"
18b5886e 64#include "stdio-util.h"
8c1be37e
LP		 65#include "string-table.h"
66#include "string-util.h"
2eedfd2d 67#include "strv.h"
e4de7287 68#include "tmpfile-util.h"
a8040b6d 69#include "udev-util.h"
2d3a5a73 70#include "user-util.h"
41488e1f 71#include "xattr-util.h"
8c1be37e 72
28e2641a
FF		 73/* how many times to wait for the device nodes to appear */
74#define N_DEVICE_NODE_LIST_ATTEMPTS 10
75
c34b75a1 76int probe_filesystem(const char *node, char **ret_fstype) {
7cc84b2c 77 /* Try to find device content type and return it in *ret_fstype. If nothing is found,
5238e957 78 * 0/NULL will be returned. -EUCLEAN will be returned for ambiguous results, and an
7cc84b2c
ZJS		 79 * different error otherwise. */
80
349cc4a5 81#if HAVE_BLKID
8e766630 82 _cleanup_(blkid_free_probep) blkid_probe b = NULL;
18b5886e
LP		 83 const char *fstype;
84 int r;
85
995fa2e5 86 errno = 0;
18b5886e
LP		 87 b = blkid_new_probe_from_filename(node);
88 if (!b)
66855de7 89 return errno_or_else(ENOMEM);
18b5886e
LP		 90
91 blkid_probe_enable_superblocks(b, 1);
92 blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE);
93
94 errno = 0;
95 r = blkid_do_safeprobe(b);
1cefb9a6 96 if (r == 1)
18b5886e 97 goto not_found;
58dfbfbd
LP		 98 if (r == -2)
99 return log_debug_errno(SYNTHETIC_ERRNO(EUCLEAN),
100 "Results ambiguous for partition %s", node);
b382db9f 101 if (r != 0)
1cefb9a6 102 return log_debug_errno(errno_or_else(EIO), "Failed to probe partition %s: %m", node);
18b5886e
LP		 103
104 (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
105
106 if (fstype) {
107 char *t;
108
1cefb9a6
LP		 109 log_debug("Probed fstype '%s' on partition %s.", fstype, node);
110
18b5886e
LP		 111 t = strdup(fstype);
112 if (!t)
113 return -ENOMEM;
114
115 *ret_fstype = t;
116 return 1;
117 }
118
119not_found:
1cefb9a6 120 log_debug("No type detected on partition %s", node);
18b5886e
LP		 121 *ret_fstype = NULL;
122 return 0;
d1c536f5
ZJS		 123#else
124 return -EOPNOTSUPP;
a75e27eb 125#endif
d1c536f5 126}
18b5886e 127
40c10d3f 128#if HAVE_BLKID
698bb074
YW		 129static int dissected_image_probe_filesystem(DissectedImage *m) {
130 int r;
131
132 assert(m);
133
134 /* Fill in file system types if we don't know them yet. */
135
136 for (PartitionDesignator i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
137 DissectedPartition *p = m->partitions + i;
138
139 if (!p->found)
140 continue;
141
142 if (!p->fstype && p->node) {
143 r = probe_filesystem(p->node, &p->fstype);
144 if (r < 0 && r != -EUCLEAN)
145 return r;
146 }
147
148 if (streq_ptr(p->fstype, "crypto_LUKS"))
149 m->encrypted = true;
150
151 if (p->fstype && fstype_is_ro(p->fstype))
152 p->rw = false;
153
154 if (!p->rw)
155 p->growfs = false;
156 }
157
158 return 0;
159}
160
0f7c9a3d
LP		 161static void check_partition_flags(
162 const char *node,
163 unsigned long long pflags,
164 unsigned long long supported) {
165
166 assert(node);
167
168 /* Mask away all flags supported by this partition's type and the three flags the UEFI spec defines generically */
92e72028
ZJS		 169 pflags &= ~(supported |
170 SD_GPT_FLAG_REQUIRED_PARTITION |
171 SD_GPT_FLAG_NO_BLOCK_IO_PROTOCOL |
172 SD_GPT_FLAG_LEGACY_BIOS_BOOTABLE);
0f7c9a3d
LP		 173
174 if (pflags == 0)
175 return;
176
177 /* If there are other bits set, then log about it, to make things discoverable */
178 for (unsigned i = 0; i < sizeof(pflags) * 8; i++) {
179 unsigned long long bit = 1ULL << i;
180 if (!FLAGS_SET(pflags, bit))
181 continue;
182
183 log_debug("Unexpected partition flag %llu set on %s!", bit, node);
184 }
185}
1b010ae7 186#endif
0f7c9a3d 187
00e29505
YW		 188#if HAVE_BLKID
189static int dissected_image_new(const char *path, DissectedImage **ret) {
190 _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL;
191 _cleanup_free_ char *name = NULL;
192 int r;
193
194 assert(ret);
195
196 if (path) {
197 _cleanup_free_ char *filename = NULL;
198
199 r = path_extract_filename(path, &filename);
200 if (r < 0)
201 return r;
202
203 r = raw_strip_suffixes(filename, &name);
204 if (r < 0)
205 return r;
206
207 if (!image_name_is_valid(name)) {
208 log_debug("Image name %s is not valid, ignoring.", strna(name));
209 name = mfree(name);
210 }
211 }
212
213 m = new(DissectedImage, 1);
214 if (!m)
215 return -ENOMEM;
216
217 *m = (DissectedImage) {
218 .has_init_system = -1,
219 .image_name = TAKE_PTR(name),
220 };
221
babd5b08
YW		 222 for (PartitionDesignator i = 0; i < _PARTITION_DESIGNATOR_MAX; i++)
223 m->partitions[i] = DISSECTED_PARTITION_NULL;
224
00e29505
YW		 225 *ret = TAKE_PTR(m);
226 return 0;
227}
228#endif
229
234c2e16 230static void dissected_partition_done(DissectedPartition *p) {
1b010ae7 231 assert(p);
786e3a52 232
1b010ae7
LP		 233 free(p->fstype);
234 free(p->node);
235 free(p->label);
236 free(p->decrypted_fstype);
237 free(p->decrypted_node);
238 free(p->mount_options);
786e3a52 239
babd5b08 240 *p = DISSECTED_PARTITION_NULL;
1b010ae7 241}
786e3a52 242
1b010ae7 243#if HAVE_BLKID
1b010ae7
LP		 244static int make_partition_devname(
245 const char *whole_devname,
246 int nr,
247 char **ret) {
786e3a52 248
1b010ae7 249 bool need_p;
786e3a52 250
1b010ae7
LP		 251 assert(whole_devname);
252 assert(nr > 0);
aae22eb3 253
1b010ae7
LP		 254 /* Given a whole block device node name (e.g. /dev/sda or /dev/loop7) generate a partition device
255 * name (e.g. /dev/sda7 or /dev/loop7p5). The rule the kernel uses is simple: if whole block device
256 * node name ends in a digit, then suffix a 'p', followed by the partition number. Otherwise, just
257 * suffix the partition number without any 'p'. */
4ba86848 258
1b010ae7
LP		 259 if (isempty(whole_devname)) /* Make sure there *is* a last char */
260 return -EINVAL;
08fe0a53 261
ff25d338 262 need_p = ascii_isdigit(whole_devname[strlen(whole_devname)-1]); /* Last char a digit? */
08fe0a53 263
1b010ae7 264 return asprintf(ret, "%s%s%i", whole_devname, need_p ? "p" : "", nr);
08fe0a53
LP		 265}
266
08f14be4
YW		 267static int dissect_image(
268 DissectedImage *m,
4526113f 269 int fd,
0b214aa0 270 const char *devname,
89e62e0b 271 const VeritySettings *verity,
18d73705 272 const MountOptions *mount_options,
08f14be4 273 DissectImageFlags flags) {
8c1be37e 274
62ea0ed0 275 sd_id128_t root_uuid = SD_ID128_NULL, root_verity_uuid = SD_ID128_NULL;
62ea0ed0 276 sd_id128_t usr_uuid = SD_ID128_NULL, usr_verity_uuid = SD_ID128_NULL;
1f8fb21c 277 bool is_gpt, is_mbr, multiple_generic = false,
de98f631
LP		 278 generic_rw = false, /* initialize to appease gcc */
279 generic_growfs = false;
8e766630 280 _cleanup_(blkid_free_probep) blkid_probe b = NULL;
8c1be37e 281 _cleanup_free_ char *generic_node = NULL;
be30ad41 282 sd_id128_t generic_uuid = SD_ID128_NULL;
0b214aa0 283 const char *pttype = NULL;
8c1be37e 284 blkid_partlist pl;
1f8fb21c 285 int r, generic_nr = -1, n_partitions;
8c1be37e 286
08f14be4 287 assert(m);
8c1be37e 288 assert(fd >= 0);
0b214aa0 289 assert(devname);
a0bff7ea 290 assert(!verity || verity->designator < 0 || IN_SET(verity->designator, PARTITION_ROOT, PARTITION_USR));
89e62e0b 291 assert(!verity || verity->root_hash || verity->root_hash_size == 0);
a0bff7ea
LP		 292 assert(!verity || verity->root_hash_sig || verity->root_hash_sig_size == 0);
293 assert(!verity || (verity->root_hash || !verity->root_hash_sig));
e7cbe5cb 294 assert(!((flags & DISSECT_IMAGE_GPT_ONLY) && (flags & DISSECT_IMAGE_NO_PARTITION_TABLE)));
8c1be37e
LP		 295
296 /* Probes a disk image, and returns information about what it found in *ret.
297 *
4623e8e6 298 * Returns -ENOPKG if no suitable partition table or file system could be found.
2679f407
LP		 299 * Returns -EADDRNOTAVAIL if a root hash was specified but no matching root/verity partitions found.
300 * Returns -ENXIO if we couldn't find any partition suitable as root or /usr partition
301 * Returns -ENOTUNIQ if we only found multiple generic partitions and thus don't know what to do with that */
4623e8e6 302
89e62e0b 303 if (verity && verity->root_hash) {
aee36b4e
LP		 304 sd_id128_t fsuuid, vuuid;
305
306 /* If a root hash is supplied, then we use the root partition that has a UUID that match the
307 * first 128bit of the root hash. And we use the verity partition that has a UUID that match
308 * the final 128bit. */
4623e8e6 309
89e62e0b 310 if (verity->root_hash_size < sizeof(sd_id128_t))
4623e8e6
LP		 311 return -EINVAL;
312
aee36b4e
LP		 313 memcpy(&fsuuid, verity->root_hash, sizeof(sd_id128_t));
314 memcpy(&vuuid, (const uint8_t*) verity->root_hash + verity->root_hash_size - sizeof(sd_id128_t), sizeof(sd_id128_t));
4623e8e6 315
aee36b4e 316 if (sd_id128_is_null(fsuuid))
4623e8e6 317 return -EINVAL;
aee36b4e 318 if (sd_id128_is_null(vuuid))
4623e8e6 319 return -EINVAL;
aee36b4e
LP		 320
321 /* If the verity data declares it's for the /usr partition, then search for that, in all
322 * other cases assume it's for the root partition. */
323 if (verity->designator == PARTITION_USR) {
324 usr_uuid = fsuuid;
325 usr_verity_uuid = vuuid;
326 } else {
327 root_uuid = fsuuid;
328 root_verity_uuid = vuuid;
329 }
4623e8e6 330 }
8c1be37e 331
8c1be37e
LP		 332 b = blkid_new_probe();
333 if (!b)
334 return -ENOMEM;
335
336 errno = 0;
337 r = blkid_probe_set_device(b, fd, 0, 0);
b382db9f 338 if (r != 0)
66855de7 339 return errno_or_else(ENOMEM);
8c1be37e 340
9b6deb03
LP		 341 if ((flags & DISSECT_IMAGE_GPT_ONLY) == 0) {
342 /* Look for file system superblocks, unless we only shall look for GPT partition tables */
343 blkid_probe_enable_superblocks(b, 1);
344 blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE|BLKID_SUBLKS_USAGE);
345 }
346
8c1be37e
LP		 347 blkid_probe_enable_partitions(b, 1);
348 blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
349
350 errno = 0;
351 r = blkid_do_safeprobe(b);
59ba6d0c
LP		 352 if (IN_SET(r, -2, 1))
353 return log_debug_errno(SYNTHETIC_ERRNO(ENOPKG), "Failed to identify any partition table.");
b382db9f 354 if (r != 0)
66855de7 355 return errno_or_else(EIO);
8c1be37e 356
e7cbe5cb 357 if ((!(flags & DISSECT_IMAGE_GPT_ONLY) &&
4b5de5dd 358 (flags & DISSECT_IMAGE_GENERIC_ROOT)) ||
e7cbe5cb 359 (flags & DISSECT_IMAGE_NO_PARTITION_TABLE)) {
9b6deb03 360 const char *usage = NULL;
8c1be37e 361
aee36b4e
LP		 362 /* If flags permit this, also allow using non-partitioned single-filesystem images */
363
9b6deb03
LP		 364 (void) blkid_probe_lookup_value(b, "USAGE", &usage, NULL);
365 if (STRPTR_IN_SET(usage, "filesystem", "crypto")) {
18d73705 366 _cleanup_free_ char *t = NULL, *n = NULL, *o = NULL;
1b010ae7 367 const char *fstype = NULL, *options = NULL;
8c1be37e 368
9b6deb03
LP		 369 /* OK, we have found a file system, that's our root partition then. */
370 (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
8c1be37e 371
9b6deb03
LP		 372 if (fstype) {
373 t = strdup(fstype);
374 if (!t)
375 return -ENOMEM;
376 }
377
6c544d14
LP		 378 n = strdup(devname);
379 if (!n)
380 return -ENOMEM;
381
e7cbe5cb 382 m->single_file_system = true;
c3c88d67
LP		 383 m->encrypted = streq_ptr(fstype, "crypto_LUKS");
384
385 m->has_verity = verity && verity->data_path;
386 m->verity_ready = m->has_verity &&
387 verity->root_hash &&
388 (verity->designator < 0 || verity->designator == PARTITION_ROOT);
e7cbe5cb 389
8ee9615e
LP		 390 m->has_verity_sig = false; /* signature not embedded, must be specified */
391 m->verity_sig_ready = m->verity_ready &&
392 verity->root_hash_sig;
393
f5215bc8 394 options = mount_options_from_designator(mount_options, PARTITION_ROOT);
18d73705
LB		 395 if (options) {
396 o = strdup(options);
397 if (!o)
398 return -ENOMEM;
399 }
400
9b6deb03
LP		 401 m->partitions[PARTITION_ROOT] = (DissectedPartition) {
402 .found = true,
e0d53d52 403 .rw = !m->verity_ready && !fstype_is_ro(fstype),
9b6deb03
LP		 404 .partno = -1,
405 .architecture = _ARCHITECTURE_INVALID,
1cc6c93a
YW		 406 .fstype = TAKE_PTR(t),
407 .node = TAKE_PTR(n),
18d73705 408 .mount_options = TAKE_PTR(o),
88b3300f
LP		 409 .offset = 0,
410 .size = UINT64_MAX,
9b6deb03 411 };
8c1be37e 412
9b6deb03
LP		 413 return 0;
414 }
8c1be37e
LP		 415 }
416
417 (void) blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL);
418 if (!pttype)
419 return -ENOPKG;
420
421 is_gpt = streq_ptr(pttype, "gpt");
422 is_mbr = streq_ptr(pttype, "dos");
423
9b6deb03 424 if (!is_gpt && ((flags & DISSECT_IMAGE_GPT_ONLY) || !is_mbr))
8c1be37e
LP		 425 return -ENOPKG;
426
0903fd26
LP		 427 /* We support external verity data partitions only if the image has no partition table */
428 if (verity && verity->data_path)
429 return -EBADR;
430
08f14be4
YW		 431 if (FLAGS_SET(flags, DISSECT_IMAGE_MANAGE_PARTITION_DEVICES)) {
432 /* Safety check: refuse block devices that carry a partition table but for which the kernel doesn't
433 * do partition scanning. */
434 r = blockdev_partscan_enabled(fd);
435 if (r < 0)
436 return r;
437 if (r == 0)
438 return -EPROTONOSUPPORT;
439 }
4ba86848 440
8c1be37e
LP		 441 errno = 0;
442 pl = blkid_probe_get_partitions(b);
b382db9f 443 if (!pl)
66855de7 444 return errno_or_else(ENOMEM);
8c1be37e 445
4ba86848
LP		 446 errno = 0;
447 n_partitions = blkid_partlist_numof_partitions(pl);
448 if (n_partitions < 0)
449 return errno_or_else(EIO);
8c1be37e 450
4ba86848 451 for (int i = 0; i < n_partitions; i++) {
1b010ae7 452 _cleanup_free_ char *node = NULL;
9b6deb03 453 unsigned long long pflags;
88b3300f 454 blkid_loff_t start, size;
8c1be37e 455 blkid_partition pp;
8c1be37e
LP		 456 int nr;
457
4ba86848
LP		 458 errno = 0;
459 pp = blkid_partlist_get_partition(pl, i);
460 if (!pp)
461 return errno_or_else(EIO);
aae22eb3 462
9b6deb03 463 pflags = blkid_partition_get_flags(pp);
8c1be37e 464
4ba86848 465 errno = 0;
8c1be37e
LP		 466 nr = blkid_partition_get_partno(pp);
467 if (nr < 0)
4ba86848 468 return errno_or_else(EIO);
8c1be37e 469
88b3300f
LP		 470 errno = 0;
471 start = blkid_partition_get_start(pp);
472 if (start < 0)
473 return errno_or_else(EIO);
474
475 assert((uint64_t) start < UINT64_MAX/512);
476
477 errno = 0;
478 size = blkid_partition_get_size(pp);
479 if (size < 0)
480 return errno_or_else(EIO);
481
482 assert((uint64_t) size < UINT64_MAX/512);
483
1b010ae7
LP		 484 r = make_partition_devname(devname, nr, &node);
485 if (r < 0)
486 return r;
487
488 /* So here's the thing: after the main ("whole") block device popped up it might take a while
489 * before the kernel fully probed the partition table. Waiting for that to finish is icky in
490 * userspace. So here's what we do instead. We issue the BLKPG_ADD_PARTITION ioctl to add the
491 * partition ourselves, racing against the kernel. Good thing is: if this call fails with
492 * EBUSY then the kernel was quicker than us, and that's totally OK, the outcome is good for
493 * us: the device node will exist. If OTOH our call was successful we won the race. Which is
494 * also good as the outcome is the same: the partition block device exists, and we can use
495 * it.
496 *
497 * Kernel returns EBUSY if there's already a partition by that number or an overlapping
498 * partition already existent. */
499
08f14be4
YW		 500 if (FLAGS_SET(flags, DISSECT_IMAGE_MANAGE_PARTITION_DEVICES)) {
501 r = block_device_add_partition(fd, node, nr, (uint64_t) start * 512, (uint64_t) size * 512);
502 if (r < 0) {
503 if (r != -EBUSY)
504 return log_debug_errno(r, "BLKPG_ADD_PARTITION failed: %m");
1b010ae7 505
08f14be4
YW		 506 log_debug_errno(r, "Kernel was quicker than us in adding partition %i.", nr);
507 } else
508 log_debug("We were quicker than kernel in adding partition %i.", nr);
509 }
1b010ae7 510
8c1be37e 511 if (is_gpt) {
569a0e42 512 PartitionDesignator designator = _PARTITION_DESIGNATOR_INVALID;
6b41a7b2 513 Architecture architecture = _ARCHITECTURE_INVALID;
08fe0a53 514 const char *stype, *sid, *fstype = NULL, *label;
4623e8e6 515 sd_id128_t type_id, id;
de98f631 516 bool rw = true, growfs = false;
8c1be37e 517
4623e8e6
LP		 518 sid = blkid_partition_get_uuid(pp);
519 if (!sid)
520 continue;
521 if (sd_id128_from_string(sid, &id) < 0)
522 continue;
523
8c1be37e
LP		 524 stype = blkid_partition_get_type_string(pp);
525 if (!stype)
526 continue;
8c1be37e
LP		 527 if (sd_id128_from_string(stype, &type_id) < 0)
528 continue;
529
08fe0a53
LP		 530 label = blkid_partition_get_name(pp); /* libblkid returns NULL here if empty */
531
92e72028 532 if (sd_id128_equal(type_id, SD_GPT_HOME)) {
a48dd347 533
92e72028
ZJS		 534 check_partition_flags(node, pflags,
535 SD_GPT_FLAG_NO_AUTO | SD_GPT_FLAG_READ_ONLY | SD_GPT_FLAG_GROWFS);
0f7c9a3d 536
92e72028 537 if (pflags & SD_GPT_FLAG_NO_AUTO)
a48dd347
LP		 538 continue;
539
8c1be37e 540 designator = PARTITION_HOME;
92e72028
ZJS		 541 rw = !(pflags & SD_GPT_FLAG_READ_ONLY);
542 growfs = FLAGS_SET(pflags, SD_GPT_FLAG_GROWFS);
aee36b4e 543
92e72028 544 } else if (sd_id128_equal(type_id, SD_GPT_SRV)) {
a48dd347 545
92e72028
ZJS		 546 check_partition_flags(node, pflags,
547 SD_GPT_FLAG_NO_AUTO | SD_GPT_FLAG_READ_ONLY | SD_GPT_FLAG_GROWFS);
0f7c9a3d 548
92e72028 549 if (pflags & SD_GPT_FLAG_NO_AUTO)
a48dd347
LP		 550 continue;
551
8c1be37e 552 designator = PARTITION_SRV;
92e72028
ZJS		 553 rw = !(pflags & SD_GPT_FLAG_READ_ONLY);
554 growfs = FLAGS_SET(pflags, SD_GPT_FLAG_GROWFS);
aee36b4e 555
92e72028 556 } else if (sd_id128_equal(type_id, SD_GPT_ESP)) {
a48dd347 557
92e72028
ZJS		 558 /* Note that we don't check the SD_GPT_FLAG_NO_AUTO flag for the ESP, as it is
559 * not defined there. We instead check the SD_GPT_FLAG_NO_BLOCK_IO_PROTOCOL, as
aee36b4e
LP		 560 * recommended by the UEFI spec (See "12.3.3 Number and Location of System
561 * Partitions"). */
a48dd347 562
92e72028 563 if (pflags & SD_GPT_FLAG_NO_BLOCK_IO_PROTOCOL)
a48dd347
LP		 564 continue;
565
8c1be37e
LP		 566 designator = PARTITION_ESP;
567 fstype = "vfat";
a8c47660 568
92e72028 569 } else if (sd_id128_equal(type_id, SD_GPT_XBOOTLDR)) {
a8c47660 570
92e72028
ZJS		 571 check_partition_flags(node, pflags,
572 SD_GPT_FLAG_NO_AUTO | SD_GPT_FLAG_READ_ONLY | SD_GPT_FLAG_GROWFS);
0f7c9a3d 573
92e72028 574 if (pflags & SD_GPT_FLAG_NO_AUTO)
a8c47660
LP		 575 continue;
576
577 designator = PARTITION_XBOOTLDR;
92e72028
ZJS		 578 rw = !(pflags & SD_GPT_FLAG_READ_ONLY);
579 growfs = FLAGS_SET(pflags, SD_GPT_FLAG_GROWFS);
49ae9d91
DDM		 580
581 } else if (gpt_partition_type_is_root(type_id)) {
4623e8e6 582
92e72028
ZJS		 583 check_partition_flags(node, pflags,
584 SD_GPT_FLAG_NO_AUTO | SD_GPT_FLAG_READ_ONLY | SD_GPT_FLAG_GROWFS);
0f7c9a3d 585
92e72028 586 if (pflags & SD_GPT_FLAG_NO_AUTO)
a48dd347
LP		 587 continue;
588
4623e8e6
LP		 589 /* If a root ID is specified, ignore everything but the root id */
590 if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id))
591 continue;
592
49ae9d91
DDM		 593 assert_se((architecture = gpt_partition_type_uuid_to_arch(type_id)) >= 0);
594 designator = PARTITION_ROOT_OF_ARCH(architecture);
92e72028
ZJS		 595 rw = !(pflags & SD_GPT_FLAG_READ_ONLY);
596 growfs = FLAGS_SET(pflags, SD_GPT_FLAG_GROWFS);
aee36b4e 597
49ae9d91 598 } else if (gpt_partition_type_is_root_verity(type_id)) {
4623e8e6 599
92e72028
ZJS		 600 check_partition_flags(node, pflags,
601 SD_GPT_FLAG_NO_AUTO | SD_GPT_FLAG_READ_ONLY);
0f7c9a3d 602
92e72028 603 if (pflags & SD_GPT_FLAG_NO_AUTO)
a48dd347
LP		 604 continue;
605
c3c88d67 606 m->has_verity = true;
4623e8e6 607
8ee9615e
LP		 608 /* If no verity configuration is specified, then don't do verity */
609 if (!verity)
610 continue;
611 if (verity->designator >= 0 && verity->designator != PARTITION_ROOT)
612 continue;
613
614 /* If root hash is specified, then ignore everything but the root id */
615 if (!sd_id128_is_null(root_verity_uuid) && !sd_id128_equal(root_verity_uuid, id))
4623e8e6
LP		 616 continue;
617
49ae9d91
DDM		 618 assert_se((architecture = gpt_partition_type_uuid_to_arch(type_id)) >= 0);
619 designator = PARTITION_VERITY_OF(PARTITION_ROOT_OF_ARCH(architecture));
4623e8e6 620 fstype = "DM_verity_hash";
4623e8e6 621 rw = false;
8ee9615e 622
49ae9d91 623 } else if (gpt_partition_type_is_root_verity_sig(type_id)) {
8ee9615e 624
92e72028
ZJS		 625 check_partition_flags(node, pflags,
626 SD_GPT_FLAG_NO_AUTO | SD_GPT_FLAG_READ_ONLY);
8ee9615e 627
92e72028 628 if (pflags & SD_GPT_FLAG_NO_AUTO)
8ee9615e
LP		 629 continue;
630
631 m->has_verity_sig = true;
632
8ee9615e
LP		 633 if (!verity)
634 continue;
635 if (verity->designator >= 0 && verity->designator != PARTITION_ROOT)
636 continue;
8ee9615e 637
49ae9d91
DDM		 638 assert_se((architecture = gpt_partition_type_uuid_to_arch(type_id)) >= 0);
639 designator = PARTITION_VERITY_SIG_OF(PARTITION_ROOT_OF_ARCH(architecture));
8ee9615e 640 fstype = "verity_hash_signature";
4623e8e6 641 rw = false;
8ee9615e 642
49ae9d91 643 } else if (gpt_partition_type_is_usr(type_id)) {
aee36b4e 644
92e72028
ZJS		 645 check_partition_flags(node, pflags,
646 SD_GPT_FLAG_NO_AUTO | SD_GPT_FLAG_READ_ONLY | SD_GPT_FLAG_GROWFS);
aee36b4e 647
92e72028 648 if (pflags & SD_GPT_FLAG_NO_AUTO)
aee36b4e
LP		 649 continue;
650
651 /* If a usr ID is specified, ignore everything but the usr id */
652 if (!sd_id128_is_null(usr_uuid) && !sd_id128_equal(usr_uuid, id))
653 continue;
654
49ae9d91
DDM		 655 assert_se((architecture = gpt_partition_type_uuid_to_arch(type_id)) >= 0);
656 designator = PARTITION_USR_OF_ARCH(architecture);
92e72028
ZJS		 657 rw = !(pflags & SD_GPT_FLAG_READ_ONLY);
658 growfs = FLAGS_SET(pflags, SD_GPT_FLAG_GROWFS);
aee36b4e 659
49ae9d91 660 } else if (gpt_partition_type_is_usr_verity(type_id)) {
aee36b4e 661
92e72028
ZJS		 662 check_partition_flags(node, pflags,
663 SD_GPT_FLAG_NO_AUTO | SD_GPT_FLAG_READ_ONLY);
aee36b4e 664
92e72028 665 if (pflags & SD_GPT_FLAG_NO_AUTO)
aee36b4e
LP		 666 continue;
667
c3c88d67 668 m->has_verity = true;
aee36b4e 669
8ee9615e
LP		 670 if (!verity)
671 continue;
672 if (verity->designator >= 0 && verity->designator != PARTITION_USR)
673 continue;
674
675 /* If usr hash is specified, then ignore everything but the usr id */
676 if (!sd_id128_is_null(usr_verity_uuid) && !sd_id128_equal(usr_verity_uuid, id))
aee36b4e
LP		 677 continue;
678
49ae9d91
DDM		 679 assert_se((architecture = gpt_partition_type_uuid_to_arch(type_id)) >= 0);
680 designator = PARTITION_VERITY_OF(PARTITION_USR_OF_ARCH(architecture));
aee36b4e 681 fstype = "DM_verity_hash";
aee36b4e 682 rw = false;
8ee9615e 683
49ae9d91 684 } else if (gpt_partition_type_is_usr_verity_sig(type_id)) {
8ee9615e 685
92e72028
ZJS		 686 check_partition_flags(node, pflags,
687 SD_GPT_FLAG_NO_AUTO | SD_GPT_FLAG_READ_ONLY);
8ee9615e 688
92e72028 689 if (pflags & SD_GPT_FLAG_NO_AUTO)
8ee9615e
LP		 690 continue;
691
692 m->has_verity_sig = true;
693
8ee9615e
LP		 694 if (!verity)
695 continue;
696 if (verity->designator >= 0 && verity->designator != PARTITION_USR)
697 continue;
8ee9615e 698
49ae9d91
DDM		 699 assert_se((architecture = gpt_partition_type_uuid_to_arch(type_id)) >= 0);
700 designator = PARTITION_VERITY_SIG_OF(PARTITION_USR_OF_ARCH(architecture));
8ee9615e 701 fstype = "verity_hash_signature";
aee36b4e 702 rw = false;
8ee9615e 703
92e72028 704 } else if (sd_id128_equal(type_id, SD_GPT_SWAP)) {
a48dd347 705
92e72028 706 check_partition_flags(node, pflags, SD_GPT_FLAG_NO_AUTO);
0f7c9a3d 707
92e72028 708 if (pflags & SD_GPT_FLAG_NO_AUTO)
a48dd347
LP		 709 continue;
710
8c1be37e 711 designator = PARTITION_SWAP;
aee36b4e 712
92e72028 713 } else if (sd_id128_equal(type_id, SD_GPT_LINUX_GENERIC)) {
8c1be37e 714
92e72028
ZJS		 715 check_partition_flags(node, pflags,
716 SD_GPT_FLAG_NO_AUTO | SD_GPT_FLAG_READ_ONLY | SD_GPT_FLAG_GROWFS);
0f7c9a3d 717
92e72028 718 if (pflags & SD_GPT_FLAG_NO_AUTO)
a48dd347
LP		 719 continue;
720
8c1be37e
LP		 721 if (generic_node)
722 multiple_generic = true;
723 else {
724 generic_nr = nr;
92e72028
ZJS		 725 generic_rw = !(pflags & SD_GPT_FLAG_READ_ONLY);
726 generic_growfs = FLAGS_SET(pflags, SD_GPT_FLAG_GROWFS);
be30ad41 727 generic_uuid = id;
8c1be37e
LP		 728 generic_node = strdup(node);
729 if (!generic_node)
730 return -ENOMEM;
731 }
d4dffb85 732
92e72028 733 } else if (sd_id128_equal(type_id, SD_GPT_TMP)) {
d4dffb85 734
92e72028
ZJS		 735 check_partition_flags(node, pflags,
736 SD_GPT_FLAG_NO_AUTO | SD_GPT_FLAG_READ_ONLY | SD_GPT_FLAG_GROWFS);
0f7c9a3d 737
92e72028 738 if (pflags & SD_GPT_FLAG_NO_AUTO)
d4dffb85
LP		 739 continue;
740
741 designator = PARTITION_TMP;
92e72028
ZJS		 742 rw = !(pflags & SD_GPT_FLAG_READ_ONLY);
743 growfs = FLAGS_SET(pflags, SD_GPT_FLAG_GROWFS);
d4dffb85 744
92e72028 745 } else if (sd_id128_equal(type_id, SD_GPT_VAR)) {
d4dffb85 746
92e72028
ZJS		 747 check_partition_flags(node, pflags,
748 SD_GPT_FLAG_NO_AUTO | SD_GPT_FLAG_READ_ONLY | SD_GPT_FLAG_GROWFS);
0f7c9a3d 749
92e72028 750 if (pflags & SD_GPT_FLAG_NO_AUTO)
d4dffb85
LP		 751 continue;
752
753 if (!FLAGS_SET(flags, DISSECT_IMAGE_RELAX_VAR_CHECK)) {
754 sd_id128_t var_uuid;
755
756 /* For /var we insist that the uuid of the partition matches the
757 * HMAC-SHA256 of the /var GPT partition type uuid, keyed by machine
758 * ID. Why? Unlike the other partitions /var is inherently
759 * installation specific, hence we need to be careful not to mount it
760 * in the wrong installation. By hashing the partition UUID from
761 * /etc/machine-id we can securely bind the partition to the
762 * installation. */
763
92e72028 764 r = sd_id128_get_machine_app_specific(SD_GPT_VAR, &var_uuid);
d4dffb85
LP		 765 if (r < 0)
766 return r;
767
768 if (!sd_id128_equal(var_uuid, id)) {
769 log_debug("Found a /var/ partition, but its UUID didn't match our expectations, ignoring.");
770 continue;
771 }
772 }
773
774 designator = PARTITION_VAR;
92e72028
ZJS		 775 rw = !(pflags & SD_GPT_FLAG_READ_ONLY);
776 growfs = FLAGS_SET(pflags, SD_GPT_FLAG_GROWFS);
8c1be37e
LP		 777 }
778
779 if (designator != _PARTITION_DESIGNATOR_INVALID) {
0fb5036f 780 _cleanup_free_ char *t = NULL, *o = NULL, *l = NULL;
18d73705 781 const char *options = NULL;
8c1be37e 782
08fe0a53
LP		 783 if (m->partitions[designator].found) {
784 /* For most partition types the first one we see wins. Except for the
785 * rootfs and /usr, where we do a version compare of the label, and
786 * let the newest version win. This permits a simple A/B versioning
787 * scheme in OS images. */
788
789 if (!PARTITION_DESIGNATOR_VERSIONED(designator) ||
234c2e16 790 strverscmp_improved(m->partitions[designator].label, label) >= 0)
08fe0a53
LP		 791 continue;
792
234c2e16 793 dissected_partition_done(m->partitions + designator);
08fe0a53 794 }
8c1be37e
LP		 795
796 if (fstype) {
797 t = strdup(fstype);
798 if (!t)
799 return -ENOMEM;
800 }
801
08fe0a53
LP		 802 if (label) {
803 l = strdup(label);
804 if (!l)
805 return -ENOMEM;
806 }
807
f5215bc8 808 options = mount_options_from_designator(mount_options, designator);
18d73705
LB		 809 if (options) {
810 o = strdup(options);
811 if (!o)
812 return -ENOMEM;
813 }
814
8c1be37e
LP		 815 m->partitions[designator] = (DissectedPartition) {
816 .found = true,
817 .partno = nr,
818 .rw = rw,
de98f631 819 .growfs = growfs,
8c1be37e 820 .architecture = architecture,
0fb5036f 821 .node = TAKE_PTR(node),
1cc6c93a 822 .fstype = TAKE_PTR(t),
08fe0a53 823 .label = TAKE_PTR(l),
be30ad41 824 .uuid = id,
18d73705 825 .mount_options = TAKE_PTR(o),
88b3300f
LP		 826 .offset = (uint64_t) start * 512,
827 .size = (uint64_t) size * 512,
8c1be37e 828 };
8c1be37e
LP		 829 }
830
831 } else if (is_mbr) {
832
a8c47660 833 switch (blkid_partition_get_type(pp)) {
8c1be37e 834
a8c47660
LP		 835 case 0x83: /* Linux partition */
836
837 if (pflags != 0x80) /* Bootable flag */
838 continue;
8c1be37e 839
a8c47660
LP		 840 if (generic_node)
841 multiple_generic = true;
842 else {
843 generic_nr = nr;
844 generic_rw = true;
de98f631 845 generic_growfs = false;
a8c47660
LP		 846 generic_node = strdup(node);
847 if (!generic_node)
848 return -ENOMEM;
849 }
850
851 break;
852
853 case 0xEA: { /* Boot Loader Spec extended $BOOT partition */
0fb5036f 854 _cleanup_free_ char *o = NULL;
a8c47660 855 sd_id128_t id = SD_ID128_NULL;
18d73705 856 const char *sid, *options = NULL;
a8c47660
LP		 857
858 /* First one wins */
234c2e16 859 if (m->partitions[PARTITION_XBOOTLDR].found)
a8c47660
LP		 860 continue;
861
862 sid = blkid_partition_get_uuid(pp);
863 if (sid)
864 (void) sd_id128_from_string(sid, &id);
865
f5215bc8 866 options = mount_options_from_designator(mount_options, PARTITION_XBOOTLDR);
18d73705
LB		 867 if (options) {
868 o = strdup(options);
869 if (!o)
870 return -ENOMEM;
871 }
872
a8c47660
LP		 873 m->partitions[PARTITION_XBOOTLDR] = (DissectedPartition) {
874 .found = true,
875 .partno = nr,
876 .rw = true,
de98f631 877 .growfs = false,
a8c47660 878 .architecture = _ARCHITECTURE_INVALID,
0fb5036f 879 .node = TAKE_PTR(node),
a8c47660 880 .uuid = id,
18d73705 881 .mount_options = TAKE_PTR(o),
88b3300f
LP		 882 .offset = (uint64_t) start * 512,
883 .size = (uint64_t) size * 512,
a8c47660
LP		 884 };
885
886 break;
887 }}
8c1be37e
LP		 888 }
889 }
890
74cb2db9 891 if (m->partitions[PARTITION_ROOT].found) {
49ae9d91
DDM		 892 /* If we found the primary arch, then invalidate the secondary and other arch to avoid any
893 * ambiguities, since we never want to mount the secondary or other arch in this case. */
74cb2db9
LP		 894 m->partitions[PARTITION_ROOT_SECONDARY].found = false;
895 m->partitions[PARTITION_ROOT_SECONDARY_VERITY].found = false;
8ee9615e 896 m->partitions[PARTITION_ROOT_SECONDARY_VERITY_SIG].found = false;
aee36b4e
LP		 897 m->partitions[PARTITION_USR_SECONDARY].found = false;
898 m->partitions[PARTITION_USR_SECONDARY_VERITY].found = false;
8ee9615e 899 m->partitions[PARTITION_USR_SECONDARY_VERITY_SIG].found = false;
8c1be37e 900
49ae9d91
DDM		 901 m->partitions[PARTITION_ROOT_OTHER].found = false;
902 m->partitions[PARTITION_ROOT_OTHER_VERITY].found = false;
903 m->partitions[PARTITION_ROOT_OTHER_VERITY_SIG].found = false;
904 m->partitions[PARTITION_USR_OTHER].found = false;
905 m->partitions[PARTITION_USR_OTHER_VERITY].found = false;
906 m->partitions[PARTITION_USR_OTHER_VERITY_SIG].found = false;
907
8ee9615e
LP		 908 } else if (m->partitions[PARTITION_ROOT_VERITY].found ||
909 m->partitions[PARTITION_ROOT_VERITY_SIG].found)
7cf66030 910 return -EADDRNOTAVAIL; /* Verity found but no matching rootfs? Something is off, refuse. */
4623e8e6 911
7cf66030 912 else if (m->partitions[PARTITION_ROOT_SECONDARY].found) {
aee36b4e 913
7cf66030 914 /* No root partition found but there's one for the secondary architecture? Then upgrade
49ae9d91
DDM		 915 * secondary arch to first and invalidate the other arch. */
916
917 log_debug("No root partition found of the native architecture, falling back to a root "
918 "partition of the secondary architecture.");
4623e8e6 919
7cf66030
LP		 920 m->partitions[PARTITION_ROOT] = m->partitions[PARTITION_ROOT_SECONDARY];
921 zero(m->partitions[PARTITION_ROOT_SECONDARY]);
922 m->partitions[PARTITION_ROOT_VERITY] = m->partitions[PARTITION_ROOT_SECONDARY_VERITY];
923 zero(m->partitions[PARTITION_ROOT_SECONDARY_VERITY]);
8ee9615e
LP		 924 m->partitions[PARTITION_ROOT_VERITY_SIG] = m->partitions[PARTITION_ROOT_SECONDARY_VERITY_SIG];
925 zero(m->partitions[PARTITION_ROOT_SECONDARY_VERITY_SIG]);
aee36b4e 926
7cf66030
LP		 927 m->partitions[PARTITION_USR] = m->partitions[PARTITION_USR_SECONDARY];
928 zero(m->partitions[PARTITION_USR_SECONDARY]);
929 m->partitions[PARTITION_USR_VERITY] = m->partitions[PARTITION_USR_SECONDARY_VERITY];
930 zero(m->partitions[PARTITION_USR_SECONDARY_VERITY]);
8ee9615e
LP		 931 m->partitions[PARTITION_USR_VERITY_SIG] = m->partitions[PARTITION_USR_SECONDARY_VERITY_SIG];
932 zero(m->partitions[PARTITION_USR_SECONDARY_VERITY_SIG]);
e0f9e7bd 933
49ae9d91
DDM		 934 m->partitions[PARTITION_ROOT_OTHER].found = false;
935 m->partitions[PARTITION_ROOT_OTHER_VERITY].found = false;
936 m->partitions[PARTITION_ROOT_OTHER_VERITY_SIG].found = false;
937 m->partitions[PARTITION_USR_OTHER].found = false;
938 m->partitions[PARTITION_USR_OTHER_VERITY].found = false;
939 m->partitions[PARTITION_USR_OTHER_VERITY_SIG].found = false;
940
8ee9615e
LP		 941 } else if (m->partitions[PARTITION_ROOT_SECONDARY_VERITY].found ||
942 m->partitions[PARTITION_ROOT_SECONDARY_VERITY_SIG].found)
7cf66030 943 return -EADDRNOTAVAIL; /* as above */
18d73705 944
49ae9d91
DDM		 945 else if (m->partitions[PARTITION_ROOT_OTHER].found) {
946
947 /* No root or secondary partition found but there's one for another architecture? Then
948 * upgrade the other architecture to first. */
949
950 log_debug("No root partition found of the native architecture or the secondary architecture, "
951 "falling back to a root partition of a non-native architecture (%s).",
952 architecture_to_string(m->partitions[PARTITION_ROOT_OTHER].architecture));
953
954 m->partitions[PARTITION_ROOT] = m->partitions[PARTITION_ROOT_OTHER];
955 zero(m->partitions[PARTITION_ROOT_OTHER]);
956 m->partitions[PARTITION_ROOT_VERITY] = m->partitions[PARTITION_ROOT_OTHER_VERITY];
957 zero(m->partitions[PARTITION_ROOT_OTHER_VERITY]);
958 m->partitions[PARTITION_ROOT_VERITY_SIG] = m->partitions[PARTITION_ROOT_OTHER_VERITY_SIG];
959 zero(m->partitions[PARTITION_ROOT_OTHER_VERITY_SIG]);
960
961 m->partitions[PARTITION_USR] = m->partitions[PARTITION_USR_OTHER];
962 zero(m->partitions[PARTITION_USR_OTHER]);
963 m->partitions[PARTITION_USR_VERITY] = m->partitions[PARTITION_USR_OTHER_VERITY];
964 zero(m->partitions[PARTITION_USR_OTHER_VERITY]);
965 m->partitions[PARTITION_USR_VERITY_SIG] = m->partitions[PARTITION_USR_OTHER_VERITY_SIG];
966 zero(m->partitions[PARTITION_USR_OTHER_VERITY_SIG]);
967 }
968
8ee9615e
LP		 969 /* Hmm, we found a signature partition but no Verity data? Something is off. */
970 if (m->partitions[PARTITION_ROOT_VERITY_SIG].found && !m->partitions[PARTITION_ROOT_VERITY].found)
971 return -EADDRNOTAVAIL;
7cf66030 972
8ee9615e 973 if (m->partitions[PARTITION_USR].found) {
49ae9d91 974 /* Invalidate secondary and other arch /usr/ if we found the primary arch */
7cf66030
LP		 975 m->partitions[PARTITION_USR_SECONDARY].found = false;
976 m->partitions[PARTITION_USR_SECONDARY_VERITY].found = false;
8ee9615e 977 m->partitions[PARTITION_USR_SECONDARY_VERITY_SIG].found = false;
7cf66030 978
49ae9d91
DDM		 979 m->partitions[PARTITION_USR_OTHER].found = false;
980 m->partitions[PARTITION_USR_OTHER_VERITY].found = false;
981 m->partitions[PARTITION_USR_OTHER_VERITY_SIG].found = false;
982
8ee9615e
LP		 983 } else if (m->partitions[PARTITION_USR_VERITY].found ||
984 m->partitions[PARTITION_USR_VERITY_SIG].found)
7cf66030 985 return -EADDRNOTAVAIL; /* as above */
8c1be37e 986
7cf66030 987 else if (m->partitions[PARTITION_USR_SECONDARY].found) {
e0f9e7bd 988
49ae9d91
DDM		 989 log_debug("No usr partition found of the native architecture, falling back to a usr "
990 "partition of the secondary architecture.");
991
7cf66030
LP		 992 /* Upgrade secondary arch to primary */
993 m->partitions[PARTITION_USR] = m->partitions[PARTITION_USR_SECONDARY];
994 zero(m->partitions[PARTITION_USR_SECONDARY]);
995 m->partitions[PARTITION_USR_VERITY] = m->partitions[PARTITION_USR_SECONDARY_VERITY];
996 zero(m->partitions[PARTITION_USR_SECONDARY_VERITY]);
8ee9615e
LP		 997 m->partitions[PARTITION_USR_VERITY_SIG] = m->partitions[PARTITION_USR_SECONDARY_VERITY_SIG];
998 zero(m->partitions[PARTITION_USR_SECONDARY_VERITY_SIG]);
7cf66030 999
49ae9d91
DDM		 1000 m->partitions[PARTITION_USR_OTHER].found = false;
1001 m->partitions[PARTITION_USR_OTHER_VERITY].found = false;
1002 m->partitions[PARTITION_USR_OTHER_VERITY_SIG].found = false;
1003
8ee9615e
LP		 1004 } else if (m->partitions[PARTITION_USR_SECONDARY_VERITY].found ||
1005 m->partitions[PARTITION_USR_SECONDARY_VERITY_SIG].found)
7cf66030
LP		 1006 return -EADDRNOTAVAIL; /* as above */
1007
49ae9d91
DDM		 1008 else if (m->partitions[PARTITION_USR_OTHER].found) {
1009
1010 log_debug("No usr partition found of the native architecture or the secondary architecture, "
1011 "falling back to a usr partition of a non-native architecture (%s).",
1012 architecture_to_string(m->partitions[PARTITION_ROOT_OTHER].architecture));
1013
1014 /* Upgrade other arch to primary */
1015 m->partitions[PARTITION_USR] = m->partitions[PARTITION_USR_OTHER];
1016 zero(m->partitions[PARTITION_USR_OTHER]);
1017 m->partitions[PARTITION_USR_VERITY] = m->partitions[PARTITION_USR_OTHER_VERITY];
1018 zero(m->partitions[PARTITION_USR_OTHER_VERITY]);
1019 m->partitions[PARTITION_USR_VERITY_SIG] = m->partitions[PARTITION_USR_OTHER_VERITY_SIG];
1020 zero(m->partitions[PARTITION_USR_OTHER_VERITY_SIG]);
1021 }
1022
8ee9615e
LP		 1023 /* Hmm, we found a signature partition but no Verity data? Something is off. */
1024 if (m->partitions[PARTITION_USR_VERITY_SIG].found && !m->partitions[PARTITION_USR_VERITY].found)
1025 return -EADDRNOTAVAIL;
1026
cb241a69
LP		 1027 /* If root and /usr are combined then insist that the architecture matches */
1028 if (m->partitions[PARTITION_ROOT].found &&
1029 m->partitions[PARTITION_USR].found &&
1030 (m->partitions[PARTITION_ROOT].architecture >= 0 &&
1031 m->partitions[PARTITION_USR].architecture >= 0 &&
1032 m->partitions[PARTITION_ROOT].architecture != m->partitions[PARTITION_USR].architecture))
1033 return -EADDRNOTAVAIL;
1034
4ab51780
LP		 1035 if (!m->partitions[PARTITION_ROOT].found &&
1036 !m->partitions[PARTITION_USR].found &&
1037 (flags & DISSECT_IMAGE_GENERIC_ROOT) &&
00a8b34f 1038 (!verity || !verity->root_hash || verity->designator != PARTITION_USR)) {
7cf66030 1039
1b010ae7 1040 /* OK, we found nothing usable, then check if there's a single generic partition, and use
4b5de5dd
LP		 1041 * that. If the root hash was set however, then we won't fall back to a generic node, because
1042 * the root hash decides. */
7cf66030
LP		 1043
1044 /* If we didn't find a properly marked root partition, but we did find a single suitable
1045 * generic Linux partition, then use this as root partition, if the caller asked for it. */
1046 if (multiple_generic)
1047 return -ENOTUNIQ;
1048
4b5de5dd
LP		 1049 /* If we didn't find a generic node, then we can't fix this up either */
1050 if (generic_node) {
1051 _cleanup_free_ char *o = NULL;
1052 const char *options;
8c1be37e 1053
f5215bc8 1054 options = mount_options_from_designator(mount_options, PARTITION_ROOT);
18d73705
LB		 1055 if (options) {
1056 o = strdup(options);
1057 if (!o)
1058 return -ENOMEM;
1059 }
1060
1f8fb21c 1061 assert(generic_nr >= 0);
8c1be37e
LP		 1062 m->partitions[PARTITION_ROOT] = (DissectedPartition) {
1063 .found = true,
1064 .rw = generic_rw,
de98f631 1065 .growfs = generic_growfs,
8c1be37e
LP		 1066 .partno = generic_nr,
1067 .architecture = _ARCHITECTURE_INVALID,
1cc6c93a 1068 .node = TAKE_PTR(generic_node),
be30ad41 1069 .uuid = generic_uuid,
18d73705 1070 .mount_options = TAKE_PTR(o),
88b3300f
LP		 1071 .offset = UINT64_MAX,
1072 .size = UINT64_MAX,
8c1be37e 1073 };
e0f9e7bd 1074 }
8c1be37e
LP		 1075 }
1076
4b5de5dd
LP		 1077 /* Check if we have a root fs if we are told to do check. /usr alone is fine too, but only if appropriate flag for that is set too */
1078 if (FLAGS_SET(flags, DISSECT_IMAGE_REQUIRE_ROOT) &&
1079 !(m->partitions[PARTITION_ROOT].found || (m->partitions[PARTITION_USR].found && FLAGS_SET(flags, DISSECT_IMAGE_USR_NO_ROOT))))
1080 return -ENXIO;
1081
7b32164f
LP		 1082 if (m->partitions[PARTITION_ROOT_VERITY].found) {
1083 /* We only support one verity partition per image, i.e. can't do for both /usr and root fs */
1084 if (m->partitions[PARTITION_USR_VERITY].found)
1085 return -ENOTUNIQ;
1086
1087 /* We don't support verity enabled root with a split out /usr. Neither with nor without
1088 * verity there. (Note that we do support verity-less root with verity-full /usr, though.) */
1089 if (m->partitions[PARTITION_USR].found)
1090 return -EADDRNOTAVAIL;
1091 }
aee36b4e 1092
1903defc
LP		 1093 if (verity) {
1094 /* If a verity designator is specified, then insist that the matching partition exists */
1095 if (verity->designator >= 0 && !m->partitions[verity->designator].found)
1096 return -EADDRNOTAVAIL;
aee36b4e 1097
3dd73ea7
DDM		 1098 bool have_verity_sig_partition =
1099 m->partitions[verity->designator == PARTITION_USR ? PARTITION_USR_VERITY_SIG : PARTITION_ROOT_VERITY_SIG].found;
1100
1903defc 1101 if (verity->root_hash) {
8ee9615e
LP		 1102 /* If we have an explicit root hash and found the partitions for it, then we are ready to use
1103 * Verity, set things up for it */
1104
1903defc
LP		 1105 if (verity->designator < 0 || verity->designator == PARTITION_ROOT) {
1106 if (!m->partitions[PARTITION_ROOT_VERITY].found || !m->partitions[PARTITION_ROOT].found)
1107 return -EADDRNOTAVAIL;
4623e8e6 1108
1903defc
LP		 1109 /* If we found a verity setup, then the root partition is necessarily read-only. */
1110 m->partitions[PARTITION_ROOT].rw = false;
1111 m->verity_ready = true;
1903defc 1112
f9e0bb61
LP		 1113 } else {
1114 assert(verity->designator == PARTITION_USR);
1115
1903defc
LP		 1116 if (!m->partitions[PARTITION_USR_VERITY].found || !m->partitions[PARTITION_USR].found)
1117 return -EADDRNOTAVAIL;
4623e8e6 1118
1903defc
LP		 1119 m->partitions[PARTITION_USR].rw = false;
1120 m->verity_ready = true;
1121 }
8ee9615e
LP		 1122
1123 if (m->verity_ready)
3dd73ea7 1124 m->verity_sig_ready = verity->root_hash_sig || have_verity_sig_partition;
8ee9615e 1125
3dd73ea7 1126 } else if (have_verity_sig_partition) {
8ee9615e
LP		 1127
1128 /* If we found an embedded signature partition, we are ready, too. */
1129
1130 m->verity_ready = m->verity_sig_ready = true;
1131 m->partitions[verity->designator == PARTITION_USR ? PARTITION_USR : PARTITION_ROOT].rw = false;
aee36b4e 1132 }
4623e8e6
LP		 1133 }
1134
08f14be4
YW		 1135 return 0;
1136}
1137#endif
18b5886e 1138
08f14be4
YW		 1139int dissect_image_file(
1140 const char *path,
1141 const VeritySettings *verity,
1142 const MountOptions *mount_options,
1143 DissectImageFlags flags,
1144 DissectedImage **ret) {
8c1be37e 1145
08f14be4
YW		 1146#if HAVE_BLKID
1147 _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL;
1148 _cleanup_close_ int fd = -1;
1149 int r;
8c1be37e 1150
08f14be4
YW		 1151 assert(path);
1152 assert((flags & DISSECT_IMAGE_BLOCK_DEVICE) == 0);
1153 assert(ret);
8c1be37e 1154
08f14be4
YW		 1155 fd = open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
1156 if (fd < 0)
1157 return -errno;
896f937f 1158
08f14be4
YW		 1159 r = fd_verify_regular(fd);
1160 if (r < 0)
1161 return r;
de98f631 1162
08f14be4
YW		 1163 r = dissected_image_new(path, &m);
1164 if (r < 0)
1165 return r;
1166
1167 r = dissect_image(m, fd, path, verity, mount_options, flags);
698bb074
YW		 1168 if (r < 0)
1169 return r;
8c1be37e 1170
1cc6c93a 1171 *ret = TAKE_PTR(m);
8c1be37e
LP		 1172 return 0;
1173#else
1174 return -EOPNOTSUPP;
1175#endif
1176}
1177
1178DissectedImage* dissected_image_unref(DissectedImage *m) {
8c1be37e
LP		 1179 if (!m)
1180 return NULL;
1181
ac1e1b5f 1182 /* First, clear dissected partitions. */
08fe0a53 1183 for (PartitionDesignator i = 0; i < _PARTITION_DESIGNATOR_MAX; i++)
234c2e16 1184 dissected_partition_done(m->partitions + i);
8c1be37e 1185
ac1e1b5f
YW		 1186 /* Second, free decrypted images. This must be after dissected_partition_done(), as freeing
1187 * DecryptedImage may try to deactivate partitions. */
1188 decrypted_image_unref(m->decrypted_image);
1189
1e63dc4f
YW		 1190 /* Third, unref LoopDevice. This must be called after the above two, as freeing LoopDevice may try to
1191 * remove existing partitions on the loopback block device. */
1192 loop_device_unref(m->loop);
1193
593fe6c0 1194 free(m->image_name);
3b925504
LP		 1195 free(m->hostname);
1196 strv_free(m->machine_info);
1197 strv_free(m->os_release);
7718ac97 1198 strv_free(m->extension_release);
3b925504 1199
5fecf46d 1200 return mfree(m);
8c1be37e
LP		 1201}
1202
18b5886e 1203static int is_loop_device(const char *path) {
553e15f2 1204 char s[SYS_BLOCK_PATH_MAX("/../loop/")];
18b5886e
LP		 1205 struct stat st;
1206
1207 assert(path);
1208
1209 if (stat(path, &st) < 0)
1210 return -errno;
1211
1212 if (!S_ISBLK(st.st_mode))
1213 return -ENOTBLK;
1214
553e15f2 1215 xsprintf_sys_block_path(s, "/loop/", st.st_dev);
18b5886e
LP		 1216 if (access(s, F_OK) < 0) {
1217 if (errno != ENOENT)
1218 return -errno;
1219
1220 /* The device itself isn't a loop device, but maybe it's a partition and its parent is? */
553e15f2 1221 xsprintf_sys_block_path(s, "/../loop/", st.st_dev);
18b5886e
LP		 1222 if (access(s, F_OK) < 0)
1223 return errno == ENOENT ? false : -errno;
1224 }
1225
1226 return true;
1227}
1228
cf32c486
LP		 1229static int run_fsck(const char *node, const char *fstype) {
1230 int r, exit_status;
1231 pid_t pid;
1232
1233 assert(node);
1234 assert(fstype);
1235
13556724 1236 r = fsck_exists_for_fstype(fstype);
cf32c486
LP		 1237 if (r < 0) {
1238 log_debug_errno(r, "Couldn't determine whether fsck for %s exists, proceeding anyway.", fstype);
1239 return 0;
1240 }
1241 if (r == 0) {
1242 log_debug("Not checking partition %s, as fsck for %s does not exist.", node, fstype);
1243 return 0;
1244 }
1245
1246 r = safe_fork("(fsck)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_RLIMIT_NOFILE_SAFE|FORK_DEATHSIG|FORK_NULL_STDIO, &pid);
1247 if (r < 0)
1248 return log_debug_errno(r, "Failed to fork off fsck: %m");
1249 if (r == 0) {
1250 /* Child */
1251 execl("/sbin/fsck", "/sbin/fsck", "-aT", node, NULL);
7e0ed2e9 1252 log_open();
cf32c486
LP		 1253 log_debug_errno(errno, "Failed to execl() fsck: %m");
1254 _exit(FSCK_OPERATIONAL_ERROR);
1255 }
1256
1257 exit_status = wait_for_terminate_and_check("fsck", pid, 0);
1258 if (exit_status < 0)
1259 return log_debug_errno(exit_status, "Failed to fork off /sbin/fsck: %m");
1260
1261 if ((exit_status & ~FSCK_ERROR_CORRECTED) != FSCK_SUCCESS) {
1262 log_debug("fsck failed with exit status %i.", exit_status);
1263
1264 if ((exit_status & (FSCK_SYSTEM_SHOULD_REBOOT|FSCK_ERRORS_LEFT_UNCORRECTED)) != 0)
1265 return log_debug_errno(SYNTHETIC_ERRNO(EUCLEAN), "File system is corrupted, refusing.");
1266
1267 log_debug("Ignoring fsck error.");
1268 }
1269
1270 return 0;
1271}
1272
81939d9d
LP		 1273static int fs_grow(const char *node_path, const char *mount_path) {
1274 _cleanup_close_ int mount_fd = -1, node_fd = -1;
81939d9d
LP		 1275 uint64_t size, newsize;
1276 int r;
1277
1278 node_fd = open(node_path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
1279 if (node_fd < 0)
1280 return log_debug_errno(errno, "Failed to open node device %s: %m", node_path);
1281
1282 if (ioctl(node_fd, BLKGETSIZE64, &size) != 0)
1283 return log_debug_errno(errno, "Failed to get block device size of %s: %m", node_path);
1284
1285 mount_fd = open(mount_path, O_RDONLY|O_DIRECTORY|O_CLOEXEC);
1286 if (mount_fd < 0)
1287 return log_debug_errno(errno, "Failed to open mountd file system %s: %m", mount_path);
1288
1289 log_debug("Resizing \"%s\" to %"PRIu64" bytes...", mount_path, size);
1290 r = resize_fs(mount_fd, size, &newsize);
1291 if (r < 0)
1292 return log_debug_errno(r, "Failed to resize \"%s\" to %"PRIu64" bytes: %m", mount_path, size);
1293
1294 if (newsize == size)
1295 log_debug("Successfully resized \"%s\" to %s bytes.",
2b59bf51 1296 mount_path, FORMAT_BYTES(newsize));
81939d9d
LP		 1297 else {
1298 assert(newsize < size);
1299 log_debug("Successfully resized \"%s\" to %s bytes (%"PRIu64" bytes lost due to blocksize).",
2b59bf51 1300 mount_path, FORMAT_BYTES(newsize), size - newsize);
81939d9d
LP		 1301 }
1302
1303 return 0;
1304}
1305
18b5886e
LP		 1306static int mount_partition(
1307 DissectedPartition *m,
1308 const char *where,
1309 const char *directory,
2d3a5a73 1310 uid_t uid_shift,
21b61b1d 1311 uid_t uid_range,
18b5886e
LP		 1312 DissectImageFlags flags) {
1313
2d3a5a73
LP		 1314 _cleanup_free_ char *chased = NULL, *options = NULL;
1315 const char *p, *node, *fstype;
21b61b1d 1316 bool rw, remap_uid_gid = false;
2eedfd2d 1317 int r;
8c1be37e
LP		 1318
1319 assert(m);
1320 assert(where);
1321
4dc28665 1322 /* Use decrypted node and matching fstype if available, otherwise use the original device */
18b5886e 1323 node = m->decrypted_node ?: m->node;
4dc28665 1324 fstype = m->decrypted_node ? m->decrypted_fstype: m->fstype;
18b5886e 1325
4dc28665 1326 if (!m->found || !node)
8c1be37e 1327 return 0;
4dc28665
LP		 1328 if (!fstype)
1329 return -EAFNOSUPPORT;
8c1be37e 1330
68ac5118
ZJS		 1331 /* We are looking at an encrypted partition? This either means stacked encryption, or the caller
1332 * didn't call dissected_image_decrypt() beforehand. Let's return a recognizable error for this
1333 * case. */
4dc28665 1334 if (streq(fstype, "crypto_LUKS"))
fa45d12c 1335 return -EUNATCH;
18b5886e 1336
ef9c184d 1337 rw = m->rw && !(flags & DISSECT_IMAGE_MOUNT_READ_ONLY);
8c1be37e 1338
cf32c486
LP		 1339 if (FLAGS_SET(flags, DISSECT_IMAGE_FSCK) && rw) {
1340 r = run_fsck(node, fstype);
1341 if (r < 0)
1342 return r;
1343 }
1344
2eedfd2d 1345 if (directory) {
334eb5b0
LP		 1346 /* Automatically create missing mount points inside the image, if necessary. */
1347 r = mkdir_p_root(where, directory, uid_shift, (gid_t) uid_shift, 0755);
1348 if (r < 0 && r != -EROFS)
1349 return r;
1f0f82f1 1350
a5648b80 1351 r = chase_symlinks(directory, where, CHASE_PREFIX_ROOT, &chased, NULL);
2eedfd2d
LP		 1352 if (r < 0)
1353 return r;
1354
1355 p = chased;
9842905e
LP		 1356 } else {
1357 /* Create top-level mount if missing – but only if this is asked for. This won't modify the
1358 * image (as the branch above does) but the host hierarchy, and the created directory might
1359 * survive our mount in the host hierarchy hence. */
1360 if (FLAGS_SET(flags, DISSECT_IMAGE_MKDIR)) {
1361 r = mkdir_p(where, 0755);
1362 if (r < 0)
1363 return r;
1364 }
1365
8c1be37e 1366 p = where;
9842905e 1367 }
8c1be37e 1368
18b5886e 1369 /* If requested, turn on discard support. */
154d2269 1370 if (fstype_can_discard(fstype) &&
18b5886e 1371 ((flags & DISSECT_IMAGE_DISCARD) ||
3afda7c7 1372 ((flags & DISSECT_IMAGE_DISCARD_ON_LOOP) && is_loop_device(m->node) > 0))) {
2d3a5a73
LP		 1373 options = strdup("discard");
1374 if (!options)
1375 return -ENOMEM;
1376 }
1377
21b61b1d 1378 if (uid_is_valid(uid_shift) && uid_shift != 0) {
2d3a5a73 1379
21b61b1d
LP		 1380 if (fstype_can_uid_gid(fstype)) {
1381 _cleanup_free_ char *uid_option = NULL;
2d3a5a73 1382
21b61b1d
LP		 1383 if (asprintf(&uid_option, "uid=" UID_FMT ",gid=" GID_FMT, uid_shift, (gid_t) uid_shift) < 0)
1384 return -ENOMEM;
1385
1386 if (!strextend_with_separator(&options, ",", uid_option))
1387 return -ENOMEM;
1388 } else if (FLAGS_SET(flags, DISSECT_IMAGE_MOUNT_IDMAPPED))
1389 remap_uid_gid = true;
2d3a5a73 1390 }
8c1be37e 1391
18d73705 1392 if (!isempty(m->mount_options))
c2bc710b 1393 if (!strextend_with_separator(&options, ",", m->mount_options))
18d73705
LB		 1394 return -ENOMEM;
1395
b620bf33
LP		 1396 /* So, when you request MS_RDONLY from ext4, then this means nothing. It happily still writes to the
1397 * backing storage. What's worse, the BLKRO[GS]ET flag and (in case of loopback devices)
1398 * LO_FLAGS_READ_ONLY don't mean anything, they affect userspace accesses only, and write accesses
1399 * from the upper file system still get propagated through to the underlying file system,
1400 * unrestricted. To actually get ext4/xfs/btrfs to stop writing to the device we need to specify
1401 * "norecovery" as mount option, in addition to MS_RDONLY. Yes, this sucks, since it means we need to
1402 * carry a per file system table here.
1403 *
1404 * Note that this means that we might not be able to mount corrupted file systems as read-only
1405 * anymore (since in some cases the kernel implementations will refuse mounting when corrupted,
1406 * read-only and "norecovery" is specified). But I think for the case of automatically determined
1407 * mount options for loopback devices this is the right choice, since otherwise using the same
1408 * loopback file twice even in read-only mode, is going to fail badly sooner or later. The usecase of
1409 * making reuse of the immutable images "just work" is more relevant to us than having read-only
1410 * access that actually modifies stuff work on such image files. Or to say this differently: if
1411 * people want their file systems to be fixed up they should just open them in writable mode, where
1412 * all these problems don't exist. */
1413 if (!rw && STRPTR_IN_SET(fstype, "ext3", "ext4", "xfs", "btrfs"))
1414 if (!strextend_with_separator(&options, ",", "norecovery"))
1415 return -ENOMEM;
1416
511a8cfe 1417 r = mount_nofollow_verbose(LOG_DEBUG, node, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), options);
d9223c07
LP		 1418 if (r < 0)
1419 return r;
1420
81939d9d
LP		 1421 if (rw && m->growfs && FLAGS_SET(flags, DISSECT_IMAGE_GROWFS))
1422 (void) fs_grow(node, p);
1423
21b61b1d 1424 if (remap_uid_gid) {
2b2777ed 1425 r = remount_idmap(p, uid_shift, uid_range, UID_INVALID, REMOUNT_IDMAPPING_HOST_ROOT);
21b61b1d
LP		 1426 if (r < 0)
1427 return r;
1428 }
1429
d9223c07 1430 return 1;
8c1be37e
LP		 1431}
1432
7cf66030
LP		 1433static int mount_root_tmpfs(const char *where, uid_t uid_shift, DissectImageFlags flags) {
1434 _cleanup_free_ char *options = NULL;
1435 int r;
1436
1437 assert(where);
1438
1439 /* For images that contain /usr/ but no rootfs, let's mount rootfs as tmpfs */
1440
1441 if (FLAGS_SET(flags, DISSECT_IMAGE_MKDIR)) {
1442 r = mkdir_p(where, 0755);
1443 if (r < 0)
1444 return r;
1445 }
1446
1447 if (uid_is_valid(uid_shift)) {
1448 if (asprintf(&options, "uid=" UID_FMT ",gid=" GID_FMT, uid_shift, (gid_t) uid_shift) < 0)
1449 return -ENOMEM;
1450 }
1451
1452 r = mount_nofollow_verbose(LOG_DEBUG, "rootfs", where, "tmpfs", MS_NODEV, options);
1453 if (r < 0)
1454 return r;
1455
1456 return 1;
1457}
1458
21b61b1d
LP		 1459int dissected_image_mount(
1460 DissectedImage *m,
1461 const char *where,
1462 uid_t uid_shift,
1463 uid_t uid_range,
1464 DissectImageFlags flags) {
1465
1f0f82f1 1466 int r, xbootldr_mounted;
8c1be37e
LP		 1467
1468 assert(m);
1469 assert(where);
1470
fa45d12c
LP		 1471 /* Returns:
1472 *
1473 * -ENXIO → No root partition found
7718ac97 1474 * -EMEDIUMTYPE → DISSECT_IMAGE_VALIDATE_OS set but no os-release/extension-release file found
fa45d12c
LP		 1475 * -EUNATCH → Encrypted partition found for which no dm-crypt was set up yet
1476 * -EUCLEAN → fsck for file system failed
1477 * -EBUSY → File system already mounted/used elsewhere (kernel)
4dc28665 1478 * -EAFNOSUPPORT → File system type not supported or not known
fa45d12c
LP		 1479 */
1480
7cf66030
LP		 1481 if (!(m->partitions[PARTITION_ROOT].found ||
1482 (m->partitions[PARTITION_USR].found && FLAGS_SET(flags, DISSECT_IMAGE_USR_NO_ROOT))))
1483 return -ENXIO; /* Require a root fs or at least a /usr/ fs (the latter is subject to a flag of its own) */
8c1be37e 1484
2d3a5a73 1485 if ((flags & DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY) == 0) {
7cf66030
LP		 1486
1487 /* First mount the root fs. If there's none we use a tmpfs. */
1488 if (m->partitions[PARTITION_ROOT].found)
21b61b1d 1489 r = mount_partition(m->partitions + PARTITION_ROOT, where, NULL, uid_shift, uid_range, flags);
7cf66030
LP		 1490 else
1491 r = mount_root_tmpfs(where, uid_shift, flags);
2d3a5a73
LP		 1492 if (r < 0)
1493 return r;
aee36b4e 1494
aee36b4e 1495 /* For us mounting root always means mounting /usr as well */
21b61b1d 1496 r = mount_partition(m->partitions + PARTITION_USR, where, "/usr", uid_shift, uid_range, flags);
aee36b4e
LP		 1497 if (r < 0)
1498 return r;
03bcb6d4 1499
9ccb531a
LB		 1500 if ((flags & (DISSECT_IMAGE_VALIDATE_OS|DISSECT_IMAGE_VALIDATE_OS_EXT)) != 0) {
1501 /* If either one of the validation flags are set, ensure that the image qualifies
1502 * as one or the other (or both). */
1503 bool ok = false;
1504
1505 if (FLAGS_SET(flags, DISSECT_IMAGE_VALIDATE_OS)) {
1506 r = path_is_os_tree(where);
1507 if (r < 0)
1508 return r;
1509 if (r > 0)
1510 ok = true;
1511 }
1512 if (!ok && FLAGS_SET(flags, DISSECT_IMAGE_VALIDATE_OS_EXT)) {
06768b90 1513 r = path_is_extension_tree(where, m->image_name, FLAGS_SET(flags, DISSECT_IMAGE_RELAX_SYSEXT_CHECK));
7718ac97
LB		 1514 if (r < 0)
1515 return r;
9ccb531a
LB		 1516 if (r > 0)
1517 ok = true;
7718ac97 1518 }
9ccb531a
LB		 1519
1520 if (!ok)
1521 return -ENOMEDIUM;
03bcb6d4 1522 }
2d3a5a73
LP		 1523 }
1524
705727fd 1525 if (flags & DISSECT_IMAGE_MOUNT_ROOT_ONLY)
2d3a5a73 1526 return 0;
8c1be37e 1527
21b61b1d 1528 r = mount_partition(m->partitions + PARTITION_HOME, where, "/home", uid_shift, uid_range, flags);
8c1be37e
LP		 1529 if (r < 0)
1530 return r;
1531
21b61b1d 1532 r = mount_partition(m->partitions + PARTITION_SRV, where, "/srv", uid_shift, uid_range, flags);
8c1be37e
LP		 1533 if (r < 0)
1534 return r;
1535
21b61b1d 1536 r = mount_partition(m->partitions + PARTITION_VAR, where, "/var", uid_shift, uid_range, flags);
d4dffb85
LP		 1537 if (r < 0)
1538 return r;
1539
21b61b1d 1540 r = mount_partition(m->partitions + PARTITION_TMP, where, "/var/tmp", uid_shift, uid_range, flags);
d4dffb85
LP		 1541 if (r < 0)
1542 return r;
1543
21b61b1d 1544 xbootldr_mounted = mount_partition(m->partitions + PARTITION_XBOOTLDR, where, "/boot", uid_shift, uid_range, flags);
1f0f82f1
LP		 1545 if (xbootldr_mounted < 0)
1546 return xbootldr_mounted;
d9223c07 1547
8c1be37e 1548 if (m->partitions[PARTITION_ESP].found) {
1f0f82f1
LP		 1549 int esp_done = false;
1550
d9223c07
LP		 1551 /* Mount the ESP to /efi if it exists. If it doesn't exist, use /boot instead, but only if it
1552 * exists and is empty, and we didn't already mount the XBOOTLDR partition into it. */
8c1be37e 1553
a5648b80 1554 r = chase_symlinks("/efi", where, CHASE_PREFIX_ROOT, NULL, NULL);
1f0f82f1
LP		 1555 if (r < 0) {
1556 if (r != -ENOENT)
d9223c07 1557 return r;
8c1be37e 1558
1f0f82f1
LP		 1559 /* /efi doesn't exist. Let's see if /boot is suitable then */
1560
1561 if (!xbootldr_mounted) {
1562 _cleanup_free_ char *p = NULL;
2eedfd2d 1563
1f0f82f1
LP		 1564 r = chase_symlinks("/boot", where, CHASE_PREFIX_ROOT, &p, NULL);
1565 if (r < 0) {
1566 if (r != -ENOENT)
1567 return r;
db55bbf2 1568 } else if (dir_is_empty(p, /* ignore_hidden_or_backup= */ false) > 0) {
1f0f82f1 1569 /* It exists and is an empty directory. Let's mount the ESP there. */
21b61b1d 1570 r = mount_partition(m->partitions + PARTITION_ESP, where, "/boot", uid_shift, uid_range, flags);
1f0f82f1
LP		 1571 if (r < 0)
1572 return r;
1573
1574 esp_done = true;
1575 }
2eedfd2d 1576 }
8c1be37e 1577 }
1f0f82f1
LP		 1578
1579 if (!esp_done) {
1580 /* OK, let's mount the ESP now to /efi (possibly creating the dir if missing) */
1581
21b61b1d 1582 r = mount_partition(m->partitions + PARTITION_ESP, where, "/efi", uid_shift, uid_range, flags);
1f0f82f1
LP		 1583 if (r < 0)
1584 return r;
1585 }
8c1be37e
LP		 1586 }
1587
1588 return 0;
1589}
1590
21b61b1d
LP		 1591int dissected_image_mount_and_warn(
1592 DissectedImage *m,
1593 const char *where,
1594 uid_t uid_shift,
1595 uid_t uid_range,
1596 DissectImageFlags flags) {
1597
af187ab2
LP		 1598 int r;
1599
1600 assert(m);
1601 assert(where);
1602
21b61b1d 1603 r = dissected_image_mount(m, where, uid_shift, uid_range, flags);
af187ab2
LP		 1604 if (r == -ENXIO)
1605 return log_error_errno(r, "Not root file system found in image.");
1606 if (r == -EMEDIUMTYPE)
7718ac97 1607 return log_error_errno(r, "No suitable os-release/extension-release file in image found.");
af187ab2
LP		 1608 if (r == -EUNATCH)
1609 return log_error_errno(r, "Encrypted file system discovered, but decryption not requested.");
1610 if (r == -EUCLEAN)
1611 return log_error_errno(r, "File system check on image failed.");
1612 if (r == -EBUSY)
1613 return log_error_errno(r, "File system already mounted elsewhere.");
4dc28665
LP		 1614 if (r == -EAFNOSUPPORT)
1615 return log_error_errno(r, "File system type not supported or not known.");
af187ab2
LP		 1616 if (r < 0)
1617 return log_error_errno(r, "Failed to mount image: %m");
1618
1619 return r;
1620}
1621
349cc4a5 1622#if HAVE_LIBCRYPTSETUP
9321ad51 1623struct DecryptedPartition {
18b5886e
LP		 1624 struct crypt_device *device;
1625 char *name;
1626 bool relinquished;
9321ad51
YW		 1627};
1628#endif
1629
1630typedef struct DecryptedPartition DecryptedPartition;
18b5886e
LP		 1631
1632struct DecryptedImage {
9321ad51 1633 unsigned n_ref;
18b5886e
LP		 1634 DecryptedPartition *decrypted;
1635 size_t n_decrypted;
18b5886e 1636};
18b5886e 1637
9321ad51 1638static DecryptedImage* decrypted_image_free(DecryptedImage *d) {
349cc4a5 1639#if HAVE_LIBCRYPTSETUP
18b5886e
LP		 1640 int r;
1641
1642 if (!d)
1643 return NULL;
1644
67f63ee5 1645 for (size_t i = 0; i < d->n_decrypted; i++) {
18b5886e
LP		 1646 DecryptedPartition *p = d->decrypted + i;
1647
1648 if (p->device && p->name && !p->relinquished) {
ea16d7f4
YW		 1649 /* Let's deactivate lazily, as the dm volume may be already/still used by other processes. */
1650 r = sym_crypt_deactivate_by_name(p->device, p->name, CRYPT_DEACTIVATE_DEFERRED);
18b5886e
LP		 1651 if (r < 0)
1652 log_debug_errno(r, "Failed to deactivate encrypted partition %s", p->name);
1653 }
1654
1655 if (p->device)
0d12936d 1656 sym_crypt_free(p->device);
18b5886e
LP		 1657 free(p->name);
1658 }
1659
f91861e4 1660 free(d->decrypted);
18b5886e
LP		 1661 free(d);
1662#endif
1663 return NULL;
1664}
1665
9321ad51
YW		 1666DEFINE_TRIVIAL_REF_UNREF_FUNC(DecryptedImage, decrypted_image, decrypted_image_free);
1667
349cc4a5 1668#if HAVE_LIBCRYPTSETUP
9321ad51
YW		 1669static int decrypted_image_new(DecryptedImage **ret) {
1670 _cleanup_(decrypted_image_unrefp) DecryptedImage *d = NULL;
1671
1672 assert(ret);
1673
1674 d = new(DecryptedImage, 1);
1675 if (!d)
1676 return -ENOMEM;
1677
1678 *d = (DecryptedImage) {
1679 .n_ref = 1,
1680 };
1681
1682 *ret = TAKE_PTR(d);
1683 return 0;
1684}
4623e8e6
LP		 1685
1686static int make_dm_name_and_node(const void *original_node, const char *suffix, char **ret_name, char **ret_node) {
1687 _cleanup_free_ char *name = NULL, *node = NULL;
1688 const char *base;
1689
1690 assert(original_node);
1691 assert(suffix);
1692 assert(ret_name);
1693 assert(ret_node);
1694
1695 base = strrchr(original_node, '/');
1696 if (!base)
ac1f3ad0
LB		 1697 base = original_node;
1698 else
1699 base++;
4623e8e6
LP		 1700 if (isempty(base))
1701 return -EINVAL;
1702
1703 name = strjoin(base, suffix);
1704 if (!name)
1705 return -ENOMEM;
1706 if (!filename_is_valid(name))
1707 return -EINVAL;
1708
0d12936d 1709 node = path_join(sym_crypt_get_dir(), name);
4623e8e6
LP		 1710 if (!node)
1711 return -ENOMEM;
1712
1cc6c93a
YW		 1713 *ret_name = TAKE_PTR(name);
1714 *ret_node = TAKE_PTR(node);
4623e8e6 1715
4623e8e6
LP		 1716 return 0;
1717}
1718
18b5886e
LP		 1719static int decrypt_partition(
1720 DissectedPartition *m,
1721 const char *passphrase,
1722 DissectImageFlags flags,
1723 DecryptedImage *d) {
1724
1725 _cleanup_free_ char *node = NULL, *name = NULL;
0d12936d 1726 _cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL;
18b5886e
LP		 1727 int r;
1728
1729 assert(m);
1730 assert(d);
1731
1732 if (!m->found || !m->node || !m->fstype)
1733 return 0;
1734
1735 if (!streq(m->fstype, "crypto_LUKS"))
1736 return 0;
1737
bdd73ac5
ZJS		 1738 if (!passphrase)
1739 return -ENOKEY;
1740
0d12936d
LP		 1741 r = dlopen_cryptsetup();
1742 if (r < 0)
1743 return r;
1744
4623e8e6
LP		 1745 r = make_dm_name_and_node(m->node, "-decrypted", &name, &node);
1746 if (r < 0)
1747 return r;
18b5886e 1748
319a4f4b 1749 if (!GREEDY_REALLOC0(d->decrypted, d->n_decrypted + 1))
18b5886e
LP		 1750 return -ENOMEM;
1751
0d12936d 1752 r = sym_crypt_init(&cd, m->node);
18b5886e 1753 if (r < 0)
715cbb81 1754 return log_debug_errno(r, "Failed to initialize dm-crypt: %m");
18b5886e 1755
efc3b12f 1756 cryptsetup_enable_logging(cd);
1887032f 1757
0d12936d 1758 r = sym_crypt_load(cd, CRYPT_LUKS, NULL);
294bd454
ZJS		 1759 if (r < 0)
1760 return log_debug_errno(r, "Failed to load LUKS metadata: %m");
18b5886e 1761
0d12936d 1762 r = sym_crypt_activate_by_passphrase(cd, name, CRYPT_ANY_SLOT, passphrase, strlen(passphrase),
ef9c184d 1763 ((flags & DISSECT_IMAGE_DEVICE_READ_ONLY) ? CRYPT_ACTIVATE_READONLY : 0) |
0d12936d 1764 ((flags & DISSECT_IMAGE_DISCARD_ON_CRYPTO) ? CRYPT_ACTIVATE_ALLOW_DISCARDS : 0));
294bd454 1765 if (r < 0) {
715cbb81 1766 log_debug_errno(r, "Failed to activate LUKS device: %m");
294bd454 1767 return r == -EPERM ? -EKEYREJECTED : r;
18b5886e 1768 }
18b5886e 1769
94344385
LP		 1770 d->decrypted[d->n_decrypted++] = (DecryptedPartition) {
1771 .name = TAKE_PTR(name),
1772 .device = TAKE_PTR(cd),
1773 };
18b5886e 1774
1cc6c93a 1775 m->decrypted_node = TAKE_PTR(node);
18b5886e
LP		 1776
1777 return 0;
4623e8e6
LP		 1778}
1779
89e62e0b
LP		 1780static int verity_can_reuse(
1781 const VeritySettings *verity,
1782 const char *name,
1783 struct crypt_device **ret_cd) {
1784
ac1f3ad0
LB		 1785 /* If the same volume was already open, check that the root hashes match, and reuse it if they do */
1786 _cleanup_free_ char *root_hash_existing = NULL;
0d12936d 1787 _cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL;
ac1f3ad0 1788 struct crypt_params_verity crypt_params = {};
89e62e0b 1789 size_t root_hash_existing_size;
ac1f3ad0
LB		 1790 int r;
1791
89e62e0b
LP		 1792 assert(verity);
1793 assert(name);
ac1f3ad0
LB		 1794 assert(ret_cd);
1795
0d12936d 1796 r = sym_crypt_init_by_name(&cd, name);
ac1f3ad0
LB		 1797 if (r < 0)
1798 return log_debug_errno(r, "Error opening verity device, crypt_init_by_name failed: %m");
0d12936d 1799
c719805e
LP		 1800 cryptsetup_enable_logging(cd);
1801
0d12936d 1802 r = sym_crypt_get_verity_info(cd, &crypt_params);
ac1f3ad0
LB		 1803 if (r < 0)
1804 return log_debug_errno(r, "Error opening verity device, crypt_get_verity_info failed: %m");
0d12936d 1805
89e62e0b
LP		 1806 root_hash_existing_size = verity->root_hash_size;
1807 root_hash_existing = malloc0(root_hash_existing_size);
ac1f3ad0
LB		 1808 if (!root_hash_existing)
1809 return -ENOMEM;
0d12936d
LP		 1810
1811 r = sym_crypt_volume_key_get(cd, CRYPT_ANY_SLOT, root_hash_existing, &root_hash_existing_size, NULL, 0);
ac1f3ad0
LB		 1812 if (r < 0)
1813 return log_debug_errno(r, "Error opening verity device, crypt_volume_key_get failed: %m");
89e62e0b
LP		 1814 if (verity->root_hash_size != root_hash_existing_size ||
1815 memcmp(root_hash_existing, verity->root_hash, verity->root_hash_size) != 0)
ac1f3ad0 1816 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Error opening verity device, it already exists but root hashes are different.");
89e62e0b 1817
ac1f3ad0 1818#if HAVE_CRYPT_ACTIVATE_BY_SIGNED_KEY
89e62e0b
LP		 1819 /* Ensure that, if signatures are supported, we only reuse the device if the previous mount used the
1820 * same settings, so that a previous unsigned mount will not be reused if the user asks to use
28423d9a 1821 * signing for the new one, and vice versa. */
89e62e0b 1822 if (!!verity->root_hash_sig != !!(crypt_params.flags & CRYPT_VERITY_ROOT_HASH_SIGNATURE))
ac1f3ad0
LB		 1823 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Error opening verity device, it already exists but signature settings are not the same.");
1824#endif
1825
1826 *ret_cd = TAKE_PTR(cd);
1827 return 0;
1828}
1829
75db809a 1830static inline char* dm_deferred_remove_clean(char *name) {
ac1f3ad0 1831 if (!name)
75db809a 1832 return NULL;
0d12936d
LP		 1833
1834 (void) sym_crypt_deactivate_by_name(NULL, name, CRYPT_DEACTIVATE_DEFERRED);
75db809a 1835 return mfree(name);
ac1f3ad0
LB		 1836}
1837DEFINE_TRIVIAL_CLEANUP_FUNC(char *, dm_deferred_remove_clean);
1838
c2fa92e7
LP		 1839static int validate_signature_userspace(const VeritySettings *verity) {
1840#if HAVE_OPENSSL
1841 _cleanup_(sk_X509_free_allp) STACK_OF(X509) *sk = NULL;
1842 _cleanup_strv_free_ char **certs = NULL;
1843 _cleanup_(PKCS7_freep) PKCS7 *p7 = NULL;
1844 _cleanup_free_ char *s = NULL;
1845 _cleanup_(BIO_freep) BIO *bio = NULL; /* 'bio' must be freed first, 's' second, hence keep this order
1846 * of declaration in place, please */
1847 const unsigned char *d;
c2fa92e7
LP		 1848 int r;
1849
1850 assert(verity);
1851 assert(verity->root_hash);
1852 assert(verity->root_hash_sig);
1853
1854 /* Because installing a signature certificate into the kernel chain is so messy, let's optionally do
1855 * userspace validation. */
1856
1857 r = conf_files_list_nulstr(&certs, ".crt", NULL, CONF_FILES_REGULAR|CONF_FILES_FILTER_MASKED, CONF_PATHS_NULSTR("verity.d"));
1858 if (r < 0)
1859 return log_debug_errno(r, "Failed to enumerate certificates: %m");
1860 if (strv_isempty(certs)) {
1861 log_debug("No userspace dm-verity certificates found.");
1862 return 0;
1863 }
1864
1865 d = verity->root_hash_sig;
1866 p7 = d2i_PKCS7(NULL, &d, (long) verity->root_hash_sig_size);
1867 if (!p7)
1868 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to parse PKCS7 DER signature data.");
1869
1870 s = hexmem(verity->root_hash, verity->root_hash_size);
1871 if (!s)
1872 return log_oom_debug();
1873
1874 bio = BIO_new_mem_buf(s, strlen(s));
1875 if (!bio)
1876 return log_oom_debug();
1877
1878 sk = sk_X509_new_null();
1879 if (!sk)
1880 return log_oom_debug();
1881
1882 STRV_FOREACH(i, certs) {
1883 _cleanup_(X509_freep) X509 *c = NULL;
1884 _cleanup_fclose_ FILE *f = NULL;
1885
1886 f = fopen(*i, "re");
1887 if (!f) {
1888 log_debug_errno(errno, "Failed to open '%s', ignoring: %m", *i);
1889 continue;
1890 }
1891
1892 c = PEM_read_X509(f, NULL, NULL, NULL);
1893 if (!c) {
1894 log_debug("Failed to load X509 certificate '%s', ignoring.", *i);
1895 continue;
1896 }
1897
1898 if (sk_X509_push(sk, c) == 0)
1899 return log_oom_debug();
1900
1901 TAKE_PTR(c);
1902 }
1903
1904 r = PKCS7_verify(p7, sk, NULL, bio, NULL, PKCS7_NOINTERN|PKCS7_NOVERIFY);
1905 if (r)
1906 log_debug("Userspace PKCS#7 validation succeeded.");
1907 else
1908 log_debug("Userspace PKCS#7 validation failed: %s", ERR_error_string(ERR_get_error(), NULL));
1909
1910 return r;
1911#else
1912 log_debug("Not doing client-side validation of dm-verity root hash signatures, OpenSSL support disabled.");
1913 return 0;
1914#endif
1915}
1916
1917static int do_crypt_activate_verity(
1918 struct crypt_device *cd,
1919 const char *name,
1920 const VeritySettings *verity) {
1921
1922 bool check_signature;
1923 int r;
1924
1925 assert(cd);
1926 assert(name);
1927 assert(verity);
1928
1929 if (verity->root_hash_sig) {
1930 r = getenv_bool_secure("SYSTEMD_DISSECT_VERITY_SIGNATURE");
1931 if (r < 0 && r != -ENXIO)
1932 log_debug_errno(r, "Failed to parse $SYSTEMD_DISSECT_VERITY_SIGNATURE");
1933
1934 check_signature = r != 0;
1935 } else
1936 check_signature = false;
1937
1938 if (check_signature) {
1939
1940#if HAVE_CRYPT_ACTIVATE_BY_SIGNED_KEY
1941 /* First, if we have support for signed keys in the kernel, then try that first. */
1942 r = sym_crypt_activate_by_signed_key(
1943 cd,
1944 name,
1945 verity->root_hash,
1946 verity->root_hash_size,
1947 verity->root_hash_sig,
1948 verity->root_hash_sig_size,
1949 CRYPT_ACTIVATE_READONLY);
1950 if (r >= 0)
1951 return r;
1952
1953 log_debug("Validation of dm-verity signature failed via the kernel, trying userspace validation instead.");
1954#else
1955 log_debug("Activation of verity device with signature requested, but not supported via the kernel by %s due to missing crypt_activate_by_signed_key(), trying userspace validation instead.",
1956 program_invocation_short_name);
1957#endif
1958
1959 /* So this didn't work via the kernel, then let's try userspace validation instead. If that
1960 * works we'll try to activate without telling the kernel the signature. */
1961
1962 r = validate_signature_userspace(verity);
1963 if (r < 0)
1964 return r;
1965 if (r == 0)
1966 return log_debug_errno(SYNTHETIC_ERRNO(ENOKEY),
1967 "Activation of signed Verity volume worked neither via the kernel nor in userspace, can't activate.");
1968 }
1969
1970 return sym_crypt_activate_by_volume_key(
1971 cd,
1972 name,
1973 verity->root_hash,
1974 verity->root_hash_size,
1975 CRYPT_ACTIVATE_READONLY);
1976}
1977
ad361a50
YW		 1978static usec_t verity_timeout(void) {
1979 usec_t t = 100 * USEC_PER_MSEC;
1980 const char *e;
1981 int r;
1982
1983 /* On slower machines, like non-KVM vm, setting up device may take a long time.
1984 * Let's make the timeout configurable. */
1985
1986 e = getenv("SYSTEMD_DISSECT_VERITY_TIMEOUT_SEC");
1987 if (!e)
1988 return t;
1989
1990 r = parse_sec(e, &t);
1991 if (r < 0)
1992 log_debug_errno(r,
1993 "Failed to parse timeout specified in $SYSTEMD_DISSECT_VERITY_TIMEOUT_SEC, "
1994 "using the default timeout (%s).",
1995 FORMAT_TIMESPAN(t, USEC_PER_MSEC));
1996
1997 return t;
1998}
1999
4623e8e6 2000static int verity_partition(
aee36b4e 2001 PartitionDesignator designator,
4623e8e6
LP		 2002 DissectedPartition *m,
2003 DissectedPartition *v,
89e62e0b 2004 const VeritySettings *verity,
4623e8e6
LP		 2005 DissectImageFlags flags,
2006 DecryptedImage *d) {
2007
0d12936d 2008 _cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL;
ac1f3ad0 2009 _cleanup_(dm_deferred_remove_cleanp) char *restore_deferred_remove = NULL;
89e62e0b 2010 _cleanup_free_ char *node = NULL, *name = NULL;
4623e8e6
LP		 2011 int r;
2012
2013 assert(m);
89e62e0b 2014 assert(v || (verity && verity->data_path));
4623e8e6 2015
89e62e0b 2016 if (!verity || !verity->root_hash)
4623e8e6 2017 return 0;
aee36b4e
LP		 2018 if (!((verity->designator < 0 && designator == PARTITION_ROOT) ||
2019 (verity->designator == designator)))
2020 return 0;
4623e8e6
LP		 2021
2022 if (!m->found || !m->node || !m->fstype)
2023 return 0;
89e62e0b 2024 if (!verity->data_path) {
e7cbe5cb
LB		 2025 if (!v->found || !v->node || !v->fstype)
2026 return 0;
4623e8e6 2027
e7cbe5cb
LB		 2028 if (!streq(v->fstype, "DM_verity_hash"))
2029 return 0;
2030 }
4623e8e6 2031
0d12936d
LP		 2032 r = dlopen_cryptsetup();
2033 if (r < 0)
2034 return r;
2035
ac1f3ad0
LB		 2036 if (FLAGS_SET(flags, DISSECT_IMAGE_VERITY_SHARE)) {
2037 /* Use the roothash, which is unique per volume, as the device node name, so that it can be reused */
2038 _cleanup_free_ char *root_hash_encoded = NULL;
0d12936d 2039
89e62e0b 2040 root_hash_encoded = hexmem(verity->root_hash, verity->root_hash_size);
ac1f3ad0
LB		 2041 if (!root_hash_encoded)
2042 return -ENOMEM;
aee36b4e 2043
ac1f3ad0
LB		 2044 r = make_dm_name_and_node(root_hash_encoded, "-verity", &name, &node);
2045 } else
2046 r = make_dm_name_and_node(m->node, "-verity", &name, &node);
4623e8e6
LP		 2047 if (r < 0)
2048 return r;
2049
89e62e0b 2050 r = sym_crypt_init(&cd, verity->data_path ?: v->node);
4623e8e6
LP		 2051 if (r < 0)
2052 return r;
2053
efc3b12f 2054 cryptsetup_enable_logging(cd);
1887032f 2055
0d12936d 2056 r = sym_crypt_load(cd, CRYPT_VERITY, NULL);
4623e8e6 2057 if (r < 0)
294bd454 2058 return r;
4623e8e6 2059
0d12936d 2060 r = sym_crypt_set_data_device(cd, m->node);
4623e8e6 2061 if (r < 0)
294bd454 2062 return r;
4623e8e6 2063
319a4f4b 2064 if (!GREEDY_REALLOC0(d->decrypted, d->n_decrypted + 1))
ac1f3ad0
LB		 2065 return -ENOMEM;
2066
2067 /* If activating fails because the device already exists, check the metadata and reuse it if it matches.
2068 * In case of ENODEV/ENOENT, which can happen if another process is activating at the exact same time,
2069 * retry a few times before giving up. */
2070 for (unsigned i = 0; i < N_DEVICE_NODE_LIST_ATTEMPTS; i++) {
1d369d78 2071 _cleanup_(sym_crypt_freep) struct crypt_device *existing_cd = NULL;
f80015ff 2072 _cleanup_close_ int fd = -1;
c2fa92e7 2073
f80015ff
YW		 2074 /* First, check if the device already exists. */
2075 fd = open(node, O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_NOCTTY);
2076 if (fd < 0 && !ERRNO_IS_DEVICE_ABSENT(errno))
2077 return log_debug_errno(errno, "Failed to open verity device %s: %m", node);
2078 if (fd >= 0)
2079 goto check; /* The device already exists. Let's check it. */
2080
2081 /* The symlink to the device node does not exist yet. Assume not activated, and let's activate it. */
c2fa92e7 2082 r = do_crypt_activate_verity(cd, name, verity);
1d369d78
YW		 2083 if (r >= 0)
2084 goto success; /* The device is activated. */
ac1f3ad0
LB		 2085 /* libdevmapper can return EINVAL when the device is already in the activation stage.
2086 * There's no way to distinguish this situation from a genuine error due to invalid
2aed63f4 2087 * parameters, so immediately fall back to activating the device with a unique name.
89e62e0b
LP		 2088 * Improvements in libcrypsetup can ensure this never happens:
2089 * https://gitlab.com/cryptsetup/cryptsetup/-/merge_requests/96 */
ac1f3ad0 2090 if (r == -EINVAL && FLAGS_SET(flags, DISSECT_IMAGE_VERITY_SHARE))
0f75b0c5 2091 break;
1d369d78
YW		 2092 if (r == -ENODEV) /* Volume is being opened but not ready, crypt_init_by_name would fail, try to open again */
2093 goto try_again;
2094 if (!IN_SET(r,
2095 -EEXIST, /* Volume has already been opened and ready to be used. */
2096 -EBUSY /* Volume is being opened but not ready, crypt_init_by_name() can fetch details. */))
2097 return log_debug_errno(r, "Failed to activate verity device %s: %m", node);
2098
f80015ff 2099 check:
1d369d78
YW		 2100 if (!restore_deferred_remove){
2101 /* To avoid races, disable automatic removal on umount while setting up the new device. Restore it on failure. */
2102 r = dm_deferred_remove_cancel(name);
12f5fbdf
YW		 2103 /* -EBUSY and -ENXIO: the device has already been removed or being removed. We cannot
2104 * use the device, try to open again. See target_message() in drivers/md/dm-ioctl.c
2105 * and dm_cancel_deferred_remove() in drivers/md/dm.c */
2106 if (IN_SET(r, -EBUSY, -ENXIO))
2107 goto try_again;
2108 if (r < 0)
1d369d78 2109 return log_debug_errno(r, "Failed to disable automated deferred removal for verity device %s: %m", node);
12f5fbdf
YW		 2110
2111 restore_deferred_remove = strdup(name);
2112 if (!restore_deferred_remove)
2113 return log_oom_debug();
1d369d78 2114 }
c2923fdc 2115
1d369d78
YW		 2116 r = verity_can_reuse(verity, name, &existing_cd);
2117 /* Same as above, -EINVAL can randomly happen when it actually means -EEXIST */
2118 if (r == -EINVAL && FLAGS_SET(flags, DISSECT_IMAGE_VERITY_SHARE))
2119 break;
2120 if (IN_SET(r,
2121 -ENOENT, /* Removed?? */
2122 -EBUSY, /* Volume is being opened but not ready, crypt_init_by_name() can fetch details. */
2123 -ENODEV /* Volume is being opened but not ready, crypt_init_by_name() would fail, try to open again. */ ))
2124 goto try_again;
2125 if (r < 0)
2126 return log_debug_errno(r, "Failed to check if existing verity device %s can be reused: %m", node);
2127
f80015ff 2128 if (fd < 0) {
1d369d78
YW		 2129 /* devmapper might say that the device exists, but the devlink might not yet have been
2130 * created. Check and wait for the udev event in that case. */
2131 r = device_wait_for_devlink(node, "block", verity_timeout(), NULL);
2132 /* Fallback to activation with a unique device if it's taking too long */
2133 if (r == -ETIMEDOUT && FLAGS_SET(flags, DISSECT_IMAGE_VERITY_SHARE))
0f75b0c5 2134 break;
1d369d78
YW		 2135 if (r < 0)
2136 return log_debug_errno(r, "Failed to wait device node symlink %s: %m", node);
c2923fdc 2137 }
ecab4c47 2138
1d369d78
YW		 2139 if (existing_cd)
2140 crypt_free_and_replace(cd, existing_cd);
2141
2142 goto success;
2143
2144 try_again:
2145 /* Device is being removed by another process. Let's wait for a while. */
ecab4c47 2146 (void) usleep(2 * USEC_PER_MSEC);
ac1f3ad0
LB		 2147 }
2148
0f75b0c5
YW		 2149 /* All trials failed or a conflicting verity device exists. Let's try to activate with a unique name. */
2150 if (FLAGS_SET(flags, DISSECT_IMAGE_VERITY_SHARE)) {
2151 /* Before trying to activate with unique name, we need to free crypt_device object.
2152 * Otherwise, we get error from libcryptsetup like the following:
2153 * ------
2154 * systemd[1234]: Cannot use device /dev/loop5 which is in use (already mapped or mounted).
2155 * ------
2156 */
2157 sym_crypt_free(cd);
2158 cd = NULL;
aee36b4e 2159 return verity_partition(designator, m, v, verity, flags & ~DISSECT_IMAGE_VERITY_SHARE, d);
0f75b0c5 2160 }
ac1f3ad0 2161
9972e6d6
YW		 2162 return log_debug_errno(SYNTHETIC_ERRNO(EBUSY), "All attempts to activate verity device %s failed.", name);
2163
2164success:
ac1f3ad0
LB		 2165 /* Everything looks good and we'll be able to mount the device, so deferred remove will be re-enabled at that point. */
2166 restore_deferred_remove = mfree(restore_deferred_remove);
4623e8e6 2167
94344385
LP		 2168 d->decrypted[d->n_decrypted++] = (DecryptedPartition) {
2169 .name = TAKE_PTR(name),
2170 .device = TAKE_PTR(cd),
2171 };
4623e8e6 2172
1cc6c93a 2173 m->decrypted_node = TAKE_PTR(node);
4623e8e6
LP		 2174
2175 return 0;
18b5886e
LP		 2176}
2177#endif
2178
2179int dissected_image_decrypt(
2180 DissectedImage *m,
2181 const char *passphrase,
89e62e0b 2182 const VeritySettings *verity,
e330f97a 2183 DissectImageFlags flags) {
18b5886e 2184
349cc4a5 2185#if HAVE_LIBCRYPTSETUP
49b5b3b4 2186 _cleanup_(decrypted_image_unrefp) DecryptedImage *d = NULL;
18b5886e
LP		 2187 int r;
2188#endif
2189
2190 assert(m);
89e62e0b 2191 assert(!verity || verity->root_hash || verity->root_hash_size == 0);
18b5886e
LP		 2192
2193 /* Returns:
2194 *
2195 * = 0 → There was nothing to decrypt
2196 * > 0 → Decrypted successfully
d1c536f5 2197 * -ENOKEY → There's something to decrypt but no key was supplied
18b5886e
LP		 2198 * -EKEYREJECTED → Passed key was not correct
2199 */
2200
89e62e0b 2201 if (verity && verity->root_hash && verity->root_hash_size < sizeof(sd_id128_t))
4623e8e6
LP		 2202 return -EINVAL;
2203
e330f97a 2204 if (!m->encrypted && !m->verity_ready)
18b5886e 2205 return 0;
18b5886e 2206
349cc4a5 2207#if HAVE_LIBCRYPTSETUP
9321ad51
YW		 2208 r = decrypted_image_new(&d);
2209 if (r < 0)
2210 return r;
18b5886e 2211
569a0e42 2212 for (PartitionDesignator i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
18b5886e 2213 DissectedPartition *p = m->partitions + i;
22043172 2214 PartitionDesignator k;
18b5886e
LP		 2215
2216 if (!p->found)
2217 continue;
2218
2219 r = decrypt_partition(p, passphrase, flags, d);
2220 if (r < 0)
2221 return r;
2222
4623e8e6
LP		 2223 k = PARTITION_VERITY_OF(i);
2224 if (k >= 0) {
aee36b4e 2225 r = verity_partition(i, p, m->partitions + k, verity, flags | DISSECT_IMAGE_VERITY_SHARE, d);
4623e8e6
LP		 2226 if (r < 0)
2227 return r;
2228 }
2229
18b5886e
LP		 2230 if (!p->decrypted_fstype && p->decrypted_node) {
2231 r = probe_filesystem(p->decrypted_node, &p->decrypted_fstype);
7cc84b2c 2232 if (r < 0 && r != -EUCLEAN)
18b5886e
LP		 2233 return r;
2234 }
2235 }
2236
ac1e1b5f 2237 m->decrypted_image = TAKE_PTR(d);
18b5886e
LP		 2238
2239 return 1;
2240#else
2241 return -EOPNOTSUPP;
2242#endif
2243}
2244
2245int dissected_image_decrypt_interactively(
2246 DissectedImage *m,
2247 const char *passphrase,
89e62e0b 2248 const VeritySettings *verity,
e330f97a 2249 DissectImageFlags flags) {
18b5886e
LP		 2250
2251 _cleanup_strv_free_erase_ char **z = NULL;
2252 int n = 3, r;
2253
2254 if (passphrase)
2255 n--;
2256
2257 for (;;) {
e330f97a 2258 r = dissected_image_decrypt(m, passphrase, verity, flags);
18b5886e
LP		 2259 if (r >= 0)
2260 return r;
2261 if (r == -EKEYREJECTED)
2262 log_error_errno(r, "Incorrect passphrase, try again!");
fc95c359
YW		 2263 else if (r != -ENOKEY)
2264 return log_error_errno(r, "Failed to decrypt image: %m");
18b5886e 2265
baaa35ad
ZJS		 2266 if (--n < 0)
2267 return log_error_errno(SYNTHETIC_ERRNO(EKEYREJECTED),
2268 "Too many retries.");
18b5886e
LP		 2269
2270 z = strv_free(z);
2271
8806bb4b 2272 r = ask_password_auto("Please enter image passphrase:", NULL, "dissect", "dissect", "dissect.passphrase", USEC_INFINITY, 0, &z);
18b5886e
LP		 2273 if (r < 0)
2274 return log_error_errno(r, "Failed to query for passphrase: %m");
2275
2276 passphrase = z[0];
2277 }
2278}
2279
e330f97a 2280static int decrypted_image_relinquish(DecryptedImage *d) {
18b5886e
LP		 2281 assert(d);
2282
67f63ee5
ZJS		 2283 /* Turns on automatic removal after the last use ended for all DM devices of this image, and sets a
2284 * boolean so that we don't clean it up ourselves either anymore */
18b5886e 2285
349cc4a5 2286#if HAVE_LIBCRYPTSETUP
67f63ee5
ZJS		 2287 int r;
2288
2289 for (size_t i = 0; i < d->n_decrypted; i++) {
18b5886e
LP		 2290 DecryptedPartition *p = d->decrypted + i;
2291
2292 if (p->relinquished)
2293 continue;
2294
0d12936d 2295 r = sym_crypt_deactivate_by_name(NULL, p->name, CRYPT_DEACTIVATE_DEFERRED);
18b5886e
LP		 2296 if (r < 0)
2297 return log_debug_errno(r, "Failed to mark %s for auto-removal: %m", p->name);
2298
2299 p->relinquished = true;
2300 }
2301#endif
2302
2303 return 0;
2304}
2305
f906075a
YW		 2306int dissected_image_relinquish(DissectedImage *m) {
2307 int r;
2308
2309 assert(m);
2310
2311 if (m->decrypted_image) {
2312 r = decrypted_image_relinquish(m->decrypted_image);
2313 if (r < 0)
2314 return r;
2315 }
2316
2317 if (m->loop)
2318 loop_device_relinquish(m->loop);
2319
2320 return 0;
2321}
2322
89e62e0b
LP		 2323static char *build_auxiliary_path(const char *image, const char *suffix) {
2324 const char *e;
2325 char *n;
2326
2327 assert(image);
2328 assert(suffix);
2329
2330 e = endswith(image, ".raw");
2331 if (!e)
2332 return strjoin(e, suffix);
2333
2334 n = new(char, e - image + strlen(suffix) + 1);
2335 if (!n)
2336 return NULL;
2337
2338 strcpy(mempcpy(n, image, e - image), suffix);
2339 return n;
2340}
2341
2342void verity_settings_done(VeritySettings *v) {
2343 assert(v);
2344
2345 v->root_hash = mfree(v->root_hash);
2346 v->root_hash_size = 0;
2347
2348 v->root_hash_sig = mfree(v->root_hash_sig);
2349 v->root_hash_sig_size = 0;
2350
2351 v->data_path = mfree(v->data_path);
2352}
2353
2354int verity_settings_load(
2355 VeritySettings *verity,
f5ea63a5
LP		 2356 const char *image,
2357 const char *root_hash_path,
89e62e0b
LP		 2358 const char *root_hash_sig_path) {
2359
2360 _cleanup_free_ void *root_hash = NULL, *root_hash_sig = NULL;
2361 size_t root_hash_size = 0, root_hash_sig_size = 0;
2362 _cleanup_free_ char *verity_data_path = NULL;
aee36b4e 2363 PartitionDesignator designator;
78ebe980
LP		 2364 int r;
2365
89e62e0b 2366 assert(verity);
78ebe980 2367 assert(image);
aee36b4e 2368 assert(verity->designator < 0 || IN_SET(verity->designator, PARTITION_ROOT, PARTITION_USR));
78ebe980 2369
89e62e0b
LP		 2370 /* If we are asked to load the root hash for a device node, exit early */
2371 if (is_device_path(image))
78ebe980 2372 return 0;
78ebe980 2373
d5fcc5b0
LP		 2374 r = getenv_bool_secure("SYSTEMD_DISSECT_VERITY_SIDECAR");
2375 if (r < 0 && r != -ENXIO)
2376 log_debug_errno(r, "Failed to parse $SYSTEMD_DISSECT_VERITY_SIDECAR, ignoring: %m");
2377 if (r == 0)
2378 return 0;
2379
aee36b4e
LP		 2380 designator = verity->designator;
2381
89e62e0b 2382 /* We only fill in what isn't already filled in */
c2923fdc 2383
89e62e0b 2384 if (!verity->root_hash) {
e7cbe5cb 2385 _cleanup_free_ char *text = NULL;
e7cbe5cb 2386
0389f4fa 2387 if (root_hash_path) {
aee36b4e 2388 /* If explicitly specified it takes precedence */
0389f4fa
LB		 2389 r = read_one_line_file(root_hash_path, &text);
2390 if (r < 0)
e7cbe5cb 2391 return r;
aee36b4e
LP		 2392
2393 if (designator < 0)
2394 designator = PARTITION_ROOT;
0389f4fa 2395 } else {
aee36b4e
LP		 2396 /* Otherwise look for xattr and separate file, and first for the data for root and if
2397 * that doesn't exist for /usr */
0389f4fa 2398
aee36b4e 2399 if (designator < 0 || designator == PARTITION_ROOT) {
c53e07e2 2400 r = getxattr_malloc(image, "user.verity.roothash", &text);
aee36b4e
LP		 2401 if (r < 0) {
2402 _cleanup_free_ char *p = NULL;
78ebe980 2403
00675c36 2404 if (r != -ENOENT && !ERRNO_IS_XATTR_ABSENT(r))
aee36b4e 2405 return r;
e7cbe5cb 2406
aee36b4e
LP		 2407 p = build_auxiliary_path(image, ".roothash");
2408 if (!p)
2409 return -ENOMEM;
2410
2411 r = read_one_line_file(p, &text);
2412 if (r < 0 && r != -ENOENT)
2413 return r;
2414 }
2415
2416 if (text)
2417 designator = PARTITION_ROOT;
2418 }
2419
2420 if (!text && (designator < 0 || designator == PARTITION_USR)) {
2421 /* So in the "roothash" xattr/file name above the "root" of course primarily
2422 * refers to the root of the Verity Merkle tree. But coincidentally it also
2423 * is the hash for the *root* file system, i.e. the "root" neatly refers to
2424 * two distinct concepts called "root". Taking benefit of this happy
2425 * coincidence we call the file with the root hash for the /usr/ file system
2426 * `usrhash`, because `usrroothash` or `rootusrhash` would just be too
2427 * confusing. We thus drop the reference to the root of the Merkle tree, and
2428 * just indicate which file system it's about. */
c53e07e2 2429 r = getxattr_malloc(image, "user.verity.usrhash", &text);
aee36b4e
LP		 2430 if (r < 0) {
2431 _cleanup_free_ char *p = NULL;
2432
00675c36 2433 if (r != -ENOENT && !ERRNO_IS_XATTR_ABSENT(r))
aee36b4e
LP		 2434 return r;
2435
2436 p = build_auxiliary_path(image, ".usrhash");
2437 if (!p)
2438 return -ENOMEM;
2439
2440 r = read_one_line_file(p, &text);
2441 if (r < 0 && r != -ENOENT)
2442 return r;
2443 }
2444
2445 if (text)
2446 designator = PARTITION_USR;
0389f4fa 2447 }
e7cbe5cb
LB		 2448 }
2449
2450 if (text) {
89e62e0b 2451 r = unhexmem(text, strlen(text), &root_hash, &root_hash_size);
e7cbe5cb
LB		 2452 if (r < 0)
2453 return r;
89e62e0b 2454 if (root_hash_size < sizeof(sd_id128_t))
e7cbe5cb
LB		 2455 return -EINVAL;
2456 }
2457 }
2458
90f98986 2459 if ((root_hash || verity->root_hash) && !verity->root_hash_sig) {
aee36b4e 2460 if (root_hash_sig_path) {
ae9cf30b 2461 r = read_full_file(root_hash_sig_path, (char**) &root_hash_sig, &root_hash_sig_size);
aee36b4e
LP		 2462 if (r < 0 && r != -ENOENT)
2463 return r;
2464
2465 if (designator < 0)
2466 designator = PARTITION_ROOT;
2467 } else {
2468 if (designator < 0 || designator == PARTITION_ROOT) {
2469 _cleanup_free_ char *p = NULL;
2470
2471 /* Follow naming convention recommended by the relevant RFC:
2472 * https://tools.ietf.org/html/rfc5751#section-3.2.1 */
2473 p = build_auxiliary_path(image, ".roothash.p7s");
2474 if (!p)
2475 return -ENOMEM;
89e62e0b 2476
ae9cf30b 2477 r = read_full_file(p, (char**) &root_hash_sig, &root_hash_sig_size);
aee36b4e
LP		 2478 if (r < 0 && r != -ENOENT)
2479 return r;
2480 if (r >= 0)
2481 designator = PARTITION_ROOT;
2482 }
2483
2484 if (!root_hash_sig && (designator < 0 || designator == PARTITION_USR)) {
2485 _cleanup_free_ char *p = NULL;
2486
2487 p = build_auxiliary_path(image, ".usrhash.p7s");
2488 if (!p)
2489 return -ENOMEM;
89e62e0b 2490
ae9cf30b 2491 r = read_full_file(p, (char**) &root_hash_sig, &root_hash_sig_size);
aee36b4e
LP		 2492 if (r < 0 && r != -ENOENT)
2493 return r;
2494 if (r >= 0)
2495 designator = PARTITION_USR;
2496 }
89e62e0b
LP		 2497 }
2498
aee36b4e 2499 if (root_hash_sig && root_hash_sig_size == 0) /* refuse empty size signatures */
89e62e0b
LP		 2500 return -EINVAL;
2501 }
2502
2503 if (!verity->data_path) {
2504 _cleanup_free_ char *p = NULL;
2505
2506 p = build_auxiliary_path(image, ".verity");
2507 if (!p)
2508 return -ENOMEM;
2509
2510 if (access(p, F_OK) < 0) {
2511 if (errno != ENOENT)
2512 return -errno;
2513 } else
2514 verity_data_path = TAKE_PTR(p);
2515 }
2516
2517 if (root_hash) {
2518 verity->root_hash = TAKE_PTR(root_hash);
2519 verity->root_hash_size = root_hash_size;
2520 }
2521
2522 if (root_hash_sig) {
2523 verity->root_hash_sig = TAKE_PTR(root_hash_sig);
2524 verity->root_hash_sig_size = root_hash_sig_size;
e7cbe5cb 2525 }
89e62e0b
LP		 2526
2527 if (verity_data_path)
2528 verity->data_path = TAKE_PTR(verity_data_path);
78ebe980 2529
aee36b4e
LP		 2530 if (verity->designator < 0)
2531 verity->designator = designator;
2532
78ebe980
LP		 2533 return 1;
2534}
2535
88b3300f
LP		 2536int dissected_image_load_verity_sig_partition(
2537 DissectedImage *m,
2538 int fd,
2539 VeritySettings *verity) {
2540
2541 _cleanup_free_ void *root_hash = NULL, *root_hash_sig = NULL;
2542 _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
2543 size_t root_hash_size, root_hash_sig_size;
2544 _cleanup_free_ char *buf = NULL;
2545 PartitionDesignator d;
2546 DissectedPartition *p;
2547 JsonVariant *rh, *sig;
2548 ssize_t n;
2549 char *e;
2550 int r;
2551
2552 assert(m);
2553 assert(fd >= 0);
2554 assert(verity);
2555
2556 if (verity->root_hash && verity->root_hash_sig) /* Already loaded? */
2557 return 0;
2558
2559 r = getenv_bool_secure("SYSTEMD_DISSECT_VERITY_EMBEDDED");
2560 if (r < 0 && r != -ENXIO)
2561 log_debug_errno(r, "Failed to parse $SYSTEMD_DISSECT_VERITY_EMBEDDED, ignoring: %m");
2562 if (r == 0)
2563 return 0;
2564
2565 d = PARTITION_VERITY_SIG_OF(verity->designator < 0 ? PARTITION_ROOT : verity->designator);
2566 assert(d >= 0);
2567
2568 p = m->partitions + d;
2569 if (!p->found)
2570 return 0;
2571 if (p->offset == UINT64_MAX || p->size == UINT64_MAX)
2572 return -EINVAL;
2573
2574 if (p->size > 4*1024*1024) /* Signature data cannot possible be larger than 4M, refuse that */
2575 return -EFBIG;
2576
2577 buf = new(char, p->size+1);
2578 if (!buf)
2579 return -ENOMEM;
2580
2581 n = pread(fd, buf, p->size, p->offset);
2582 if (n < 0)
2583 return -ENOMEM;
2584 if ((uint64_t) n != p->size)
2585 return -EIO;
2586
2587 e = memchr(buf, 0, p->size);
2588 if (e) {
2589 /* If we found a NUL byte then the rest of the data must be NUL too */
2590 if (!memeqzero(e, p->size - (e - buf)))
2591 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Signature data contains embedded NUL byte.");
2592 } else
2593 buf[p->size] = 0;
2594
2595 r = json_parse(buf, 0, &v, NULL, NULL);
2596 if (r < 0)
2597 return log_debug_errno(r, "Failed to parse signature JSON data: %m");
2598
2599 rh = json_variant_by_key(v, "rootHash");
2600 if (!rh)
2601 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Signature JSON object lacks 'rootHash' field.");
2602 if (!json_variant_is_string(rh))
2603 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "'rootHash' field of signature JSON object is not a string.");
2604
2605 r = unhexmem(json_variant_string(rh), SIZE_MAX, &root_hash, &root_hash_size);
2606 if (r < 0)
2607 return log_debug_errno(r, "Failed to parse root hash field: %m");
2608
2609 /* Check if specified root hash matches if it is specified */
2610 if (verity->root_hash &&
2611 memcmp_nn(verity->root_hash, verity->root_hash_size, root_hash, root_hash_size) != 0) {
2612 _cleanup_free_ char *a = NULL, *b = NULL;
2613
2614 a = hexmem(root_hash, root_hash_size);
2615 b = hexmem(verity->root_hash, verity->root_hash_size);
2616
2617 return log_debug_errno(r, "Root hash in signature JSON data (%s) doesn't match configured hash (%s).", strna(a), strna(b));
2618 }
2619
2620 sig = json_variant_by_key(v, "signature");
2621 if (!sig)
2622 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Signature JSON object lacks 'signature' field.");
2623 if (!json_variant_is_string(sig))
2624 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "'signature' field of signature JSON object is not a string.");
2625
2626 r = unbase64mem(json_variant_string(sig), SIZE_MAX, &root_hash_sig, &root_hash_sig_size);
2627 if (r < 0)
2628 return log_debug_errno(r, "Failed to parse signature field: %m");
2629
2630 free_and_replace(verity->root_hash, root_hash);
2631 verity->root_hash_size = root_hash_size;
2632
2633 free_and_replace(verity->root_hash_sig, root_hash_sig);
2634 verity->root_hash_sig_size = root_hash_sig_size;
2635
2636 return 1;
2637}
2638
22847508 2639int dissected_image_acquire_metadata(DissectedImage *m, DissectImageFlags extra_flags) {
3b925504
LP		 2640
2641 enum {
2642 META_HOSTNAME,
2643 META_MACHINE_ID,
2644 META_MACHINE_INFO,
2645 META_OS_RELEASE,
7718ac97 2646 META_EXTENSION_RELEASE,
a4e0d617 2647 META_HAS_INIT_SYSTEM,
3b925504
LP		 2648 _META_MAX,
2649 };
2650
9a4b883b 2651 static const char *const paths[_META_MAX] = {
7718ac97
LB		 2652 [META_HOSTNAME] = "/etc/hostname\0",
2653 [META_MACHINE_ID] = "/etc/machine-id\0",
2654 [META_MACHINE_INFO] = "/etc/machine-info\0",
9a4b883b 2655 [META_OS_RELEASE] = ("/etc/os-release\0"
22847508 2656 "/usr/lib/os-release\0"),
a4e0d617
LP		 2657 [META_EXTENSION_RELEASE] = "extension-release\0", /* Used only for logging. */
2658 [META_HAS_INIT_SYSTEM] = "has-init-system\0", /* ditto */
3b925504
LP		 2659 };
2660
7718ac97 2661 _cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL, **extension_release = NULL;
af8219d5 2662 _cleanup_close_pair_ int error_pipe[2] = { -1, -1 };
3b925504
LP		 2663 _cleanup_(rmdir_and_freep) char *t = NULL;
2664 _cleanup_(sigkill_waitp) pid_t child = 0;
2665 sd_id128_t machine_id = SD_ID128_NULL;
2666 _cleanup_free_ char *hostname = NULL;
67f63ee5 2667 unsigned n_meta_initialized = 0;
af8219d5 2668 int fds[2 * _META_MAX], r, v;
a4e0d617 2669 int has_init_system = -1;
af8219d5 2670 ssize_t n;
3b925504
LP		 2671
2672 BLOCK_SIGNALS(SIGCHLD);
2673
2674 assert(m);
2675
7718ac97 2676 for (; n_meta_initialized < _META_MAX; n_meta_initialized ++) {
d9119c00
LP		 2677 if (!paths[n_meta_initialized]) {
2678 fds[2*n_meta_initialized] = fds[2*n_meta_initialized+1] = -1;
7718ac97 2679 continue;
d9119c00
LP		 2680 }
2681
3b925504
LP		 2682 if (pipe2(fds + 2*n_meta_initialized, O_CLOEXEC) < 0) {
2683 r = -errno;
2684 goto finish;
2685 }
7718ac97 2686 }
3b925504
LP		 2687
2688 r = mkdtemp_malloc("/tmp/dissect-XXXXXX", &t);
2689 if (r < 0)
2690 goto finish;
2691
af8219d5
LP		 2692 if (pipe2(error_pipe, O_CLOEXEC) < 0) {
2693 r = -errno;
2694 goto finish;
2695 }
2696
e2047ba9 2697 r = safe_fork("(sd-dissect)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_NEW_MOUNTNS|FORK_MOUNTNS_SLAVE, &child);
be39f6ee 2698 if (r < 0)
3b925504 2699 goto finish;
be39f6ee 2700 if (r == 0) {
a4e0d617 2701 /* Child in a new mount namespace */
af8219d5
LP		 2702 error_pipe[0] = safe_close(error_pipe[0]);
2703
7cf66030
LP		 2704 r = dissected_image_mount(
2705 m,
2706 t,
2707 UID_INVALID,
21b61b1d 2708 UID_INVALID,
22847508
ZJS		 2709 extra_flags |
2710 DISSECT_IMAGE_READ_ONLY |
2711 DISSECT_IMAGE_MOUNT_ROOT_ONLY |
7cf66030 2712 DISSECT_IMAGE_USR_NO_ROOT);
429d4e41
LP		 2713 if (r < 0) {
2714 log_debug_errno(r, "Failed to mount dissected image: %m");
03ae68f4 2715 goto inner_fail;
429d4e41 2716 }
3b925504 2717
67f63ee5 2718 for (unsigned k = 0; k < _META_MAX; k++) {
37e44c3f 2719 _cleanup_close_ int fd = -ENOENT;
3b925504
LP		 2720 const char *p;
2721
7718ac97
LB		 2722 if (!paths[k])
2723 continue;
2724
3b925504
LP		 2725 fds[2*k] = safe_close(fds[2*k]);
2726
a4e0d617
LP		 2727 switch (k) {
2728
2729 case META_EXTENSION_RELEASE:
9a4b883b
LB		 2730 /* As per the os-release spec, if the image is an extension it will have a file
2731 * named after the image name in extension-release.d/ - we use the image name
2732 * and try to resolve it with the extension-release helpers, as sometimes
2733 * the image names are mangled on deployment and do not match anymore.
2734 * Unlike other paths this is not fixed, and the image name
2735 * can be mangled on deployment, so by calling into the helper
2736 * we allow a fallback that matches on the first extension-release
2737 * file found in the directory, if one named after the image cannot
2738 * be found first. */
06768b90 2739 r = open_extension_release(t, m->image_name, /* relax_extension_release_check= */ false, NULL, &fd);
9a4b883b
LB		 2740 if (r < 0)
2741 fd = r; /* Propagate the error. */
a4e0d617
LP		 2742 break;
2743
2744 case META_HAS_INIT_SYSTEM: {
2745 bool found = false;
a4e0d617
LP		 2746
2747 FOREACH_STRING(init,
2748 "/usr/lib/systemd/systemd", /* systemd on /usr merged system */
2749 "/lib/systemd/systemd", /* systemd on /usr non-merged systems */
2750 "/sbin/init") { /* traditional path the Linux kernel invokes */
2751
2752 r = chase_symlinks(init, t, CHASE_PREFIX_ROOT, NULL, NULL);
2753 if (r < 0) {
2754 if (r != -ENOENT)
2755 log_debug_errno(r, "Failed to resolve %s, ignoring: %m", init);
2756 } else {
2757 found = true;
2758 break;
2759 }
2760 }
2761
2762 r = loop_write(fds[2*k+1], &found, sizeof(found), false);
2763 if (r < 0)
2764 goto inner_fail;
2765
2766 continue;
2767 }
2768
2769 default:
9a4b883b
LB		 2770 NULSTR_FOREACH(p, paths[k]) {
2771 fd = chase_symlinks_and_open(p, t, CHASE_PREFIX_ROOT, O_RDONLY|O_CLOEXEC|O_NOCTTY, NULL);
2772 if (fd >= 0)
2773 break;
2774 }
a4e0d617
LP		 2775 }
2776
36952d19
LP		 2777 if (fd < 0) {
2778 log_debug_errno(fd, "Failed to read %s file of image, ignoring: %m", paths[k]);
37e44c3f 2779 fds[2*k+1] = safe_close(fds[2*k+1]);
3b925504 2780 continue;
36952d19 2781 }
3b925504 2782
f5fbe71d 2783 r = copy_bytes(fd, fds[2*k+1], UINT64_MAX, 0);
a4e0d617
LP		 2784 if (r < 0)
2785 goto inner_fail;
3b925504
LP		 2786
2787 fds[2*k+1] = safe_close(fds[2*k+1]);
2788 }
2789
2790 _exit(EXIT_SUCCESS);
a4e0d617
LP		 2791
2792 inner_fail:
03ae68f4 2793 /* Let parent know the error */
a4e0d617
LP		 2794 (void) write(error_pipe[1], &r, sizeof(r));
2795 _exit(EXIT_FAILURE);
3b925504
LP		 2796 }
2797
af8219d5
LP		 2798 error_pipe[1] = safe_close(error_pipe[1]);
2799
67f63ee5 2800 for (unsigned k = 0; k < _META_MAX; k++) {
3b925504
LP		 2801 _cleanup_fclose_ FILE *f = NULL;
2802
7718ac97
LB		 2803 if (!paths[k])
2804 continue;
2805
3b925504
LP		 2806 fds[2*k+1] = safe_close(fds[2*k+1]);
2807
4fa744a3 2808 f = take_fdopen(&fds[2*k], "r");
3b925504
LP		 2809 if (!f) {
2810 r = -errno;
2811 goto finish;
2812 }
2813
3b925504
LP		 2814 switch (k) {
2815
2816 case META_HOSTNAME:
2817 r = read_etc_hostname_stream(f, &hostname);
2818 if (r < 0)
f6048e5e 2819 log_debug_errno(r, "Failed to read /etc/hostname of image: %m");
3b925504
LP		 2820
2821 break;
2822
2823 case META_MACHINE_ID: {
2824 _cleanup_free_ char *line = NULL;
2825
2826 r = read_line(f, LONG_LINE_MAX, &line);
2827 if (r < 0)
f6048e5e 2828 log_debug_errno(r, "Failed to read /etc/machine-id of image: %m");
3b925504
LP		 2829 else if (r == 33) {
2830 r = sd_id128_from_string(line, &machine_id);
2831 if (r < 0)
2832 log_debug_errno(r, "Image contains invalid /etc/machine-id: %s", line);
2833 } else if (r == 0)
f6048e5e 2834 log_debug("/etc/machine-id file of image is empty.");
ab763cb2 2835 else if (streq(line, "uninitialized"))
f6048e5e 2836 log_debug("/etc/machine-id file of image is uninitialized (likely aborted first boot).");
3b925504 2837 else
f6048e5e 2838 log_debug("/etc/machine-id file of image has unexpected length %i.", r);
3b925504
LP		 2839
2840 break;
2841 }
2842
2843 case META_MACHINE_INFO:
aa8fbc74 2844 r = load_env_file_pairs(f, "machine-info", &machine_info);
3b925504 2845 if (r < 0)
f6048e5e 2846 log_debug_errno(r, "Failed to read /etc/machine-info of image: %m");
3b925504
LP		 2847
2848 break;
2849
2850 case META_OS_RELEASE:
aa8fbc74 2851 r = load_env_file_pairs(f, "os-release", &os_release);
3b925504 2852 if (r < 0)
f6048e5e 2853 log_debug_errno(r, "Failed to read OS release file of image: %m");
3b925504
LP		 2854
2855 break;
7718ac97
LB		 2856
2857 case META_EXTENSION_RELEASE:
2858 r = load_env_file_pairs(f, "extension-release", &extension_release);
2859 if (r < 0)
f6048e5e 2860 log_debug_errno(r, "Failed to read extension release file of image: %m");
7718ac97
LB		 2861
2862 break;
a4e0d617
LP		 2863
2864 case META_HAS_INIT_SYSTEM: {
2865 bool b = false;
2866 size_t nr;
2867
2868 errno = 0;
2869 nr = fread(&b, 1, sizeof(b), f);
2870 if (nr != sizeof(b))
2871 log_debug_errno(errno_or_else(EIO), "Failed to read has-init-system boolean: %m");
2872 else
2873 has_init_system = b;
2874
2875 break;
2876 }}
3b925504
LP		 2877 }
2878
2e87a1fd 2879 r = wait_for_terminate_and_check("(sd-dissect)", child, 0);
3b925504 2880 child = 0;
2e87a1fd 2881 if (r < 0)
af8219d5
LP		 2882 return r;
2883
2884 n = read(error_pipe[0], &v, sizeof(v));
2885 if (n < 0)
2886 return -errno;
2887 if (n == sizeof(v))
2888 return v; /* propagate error sent to us from child */
2889 if (n != 0)
2890 return -EIO;
2891
2e87a1fd
LP		 2892 if (r != EXIT_SUCCESS)
2893 return -EPROTO;
3b925504
LP		 2894
2895 free_and_replace(m->hostname, hostname);
2896 m->machine_id = machine_id;
2897 strv_free_and_replace(m->machine_info, machine_info);
2898 strv_free_and_replace(m->os_release, os_release);
7718ac97 2899 strv_free_and_replace(m->extension_release, extension_release);
a4e0d617 2900 m->has_init_system = has_init_system;
3b925504
LP		 2901
2902finish:
67f63ee5 2903 for (unsigned k = 0; k < n_meta_initialized; k++)
3b925504
LP		 2904 safe_close_pair(fds + 2*k);
2905
2906 return r;
2907}
2908
1e63dc4f
YW		 2909int dissect_loop_device(
2910 LoopDevice *loop,
2911 const VeritySettings *verity,
2912 const MountOptions *mount_options,
2913 DissectImageFlags flags,
2914 DissectedImage **ret) {
2915
08f14be4 2916#if HAVE_BLKID
1e63dc4f
YW		 2917 _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL;
2918 int r;
2919
2920 assert(loop);
2921 assert(ret);
2922
08f14be4 2923 r = dissected_image_new(loop->backing_file ?: loop->node, &m);
1e63dc4f
YW		 2924 if (r < 0)
2925 return r;
2926
2927 m->loop = loop_device_ref(loop);
2928
08f14be4
YW		 2929 r = dissect_image(m, loop->fd, loop->node, verity, mount_options, flags | DISSECT_IMAGE_BLOCK_DEVICE);
2930 if (r < 0)
2931 return r;
2932
2933 r = dissected_image_probe_filesystem(m);
2934 if (r < 0)
2935 return r;
2936
1e63dc4f
YW		 2937 *ret = TAKE_PTR(m);
2938 return 0;
08f14be4
YW		 2939#else
2940 return -EOPNOTSUPP;
2941#endif
1e63dc4f
YW		 2942}
2943
bad31660 2944int dissect_loop_device_and_warn(
1e63dc4f 2945 LoopDevice *loop,
89e62e0b 2946 const VeritySettings *verity,
18d73705 2947 const MountOptions *mount_options,
4526113f
LP		 2948 DissectImageFlags flags,
2949 DissectedImage **ret) {
2950
64dd3a24 2951 const char *name;
4526113f
LP		 2952 int r;
2953
bad31660
YW		 2954 assert(loop);
2955 assert(loop->fd >= 0);
4526113f 2956
64dd3a24 2957 name = ASSERT_PTR(loop->backing_file ?: loop->node);
4526113f 2958
369de26f 2959 r = dissect_loop_device(loop, verity, mount_options, flags, ret);
4526113f
LP		 2960 switch (r) {
2961
2962 case -EOPNOTSUPP:
2963 return log_error_errno(r, "Dissecting images is not supported, compiled without blkid support.");
2964
2965 case -ENOPKG:
48084df6
ZJS		 2966 return log_error_errno(r, "%s: Couldn't identify a suitable partition table or file system.", name);
2967
2968 case -ENOMEDIUM:
2969 return log_error_errno(r, "%s: The image does not pass validation.", name);
4526113f
LP		 2970
2971 case -EADDRNOTAVAIL:
48084df6 2972 return log_error_errno(r, "%s: No root partition for specified root hash found.", name);
4526113f
LP		 2973
2974 case -ENOTUNIQ:
48084df6 2975 return log_error_errno(r, "%s: Multiple suitable root partitions found in image.", name);
4526113f
LP		 2976
2977 case -ENXIO:
48084df6 2978 return log_error_errno(r, "%s: No suitable root partition found in image.", name);
4526113f
LP		 2979
2980 case -EPROTONOSUPPORT:
2981 return log_error_errno(r, "Device '%s' is loopback block device with partition scanning turned off, please turn it on.", name);
2982
48084df6
ZJS		 2983 case -ENOTBLK:
2984 return log_error_errno(r, "%s: Image is not a block device.", name);
2985
a94aa2b9
LP		 2986 case -EBADR:
2987 return log_error_errno(r,
2988 "Combining partitioned images (such as '%s') with external Verity data (such as '%s') not supported. "
2989 "(Consider setting $SYSTEMD_DISSECT_VERITY_SIDECAR=0 to disable automatic discovery of external Verity data.)",
2990 name, strna(verity ? verity->data_path : NULL));
2991
4526113f
LP		 2992 default:
2993 if (r < 0)
2994 return log_error_errno(r, "Failed to dissect image '%s': %m", name);
2995
2996 return r;
2997 }
2998}
2999
49536766
LP		 3000bool dissected_image_verity_candidate(const DissectedImage *image, PartitionDesignator partition_designator) {
3001 assert(image);
3002
3003 /* Checks if this partition could theoretically do Verity. For non-partitioned images this only works
3004 * if there's an external verity file supplied, for which we can consult .has_verity. For partitioned
3005 * images we only check the partition type.
3006 *
3007 * This call is used to decide whether to suppress or show a verity column in tabular output of the
3008 * image. */
3009
e7cbe5cb 3010 if (image->single_file_system)
c3c88d67 3011 return partition_designator == PARTITION_ROOT && image->has_verity;
e7cbe5cb
LB		 3012
3013 return PARTITION_VERITY_OF(partition_designator) >= 0;
3014}
3015
49536766
LP		 3016bool dissected_image_verity_ready(const DissectedImage *image, PartitionDesignator partition_designator) {
3017 PartitionDesignator k;
3018
3019 assert(image);
3020
3021 /* Checks if this partition has verity data available that we can activate. For non-partitioned this
3022 * works for the root partition, for others only if the associated verity partition was found. */
3023
3024 if (!image->verity_ready)
3025 return false;
e7cbe5cb
LB		 3026
3027 if (image->single_file_system)
49536766 3028 return partition_designator == PARTITION_ROOT;
e7cbe5cb
LB		 3029
3030 k = PARTITION_VERITY_OF(partition_designator);
3031 return k >= 0 && image->partitions[k].found;
3032}
3033
8ee9615e
LP		 3034bool dissected_image_verity_sig_ready(const DissectedImage *image, PartitionDesignator partition_designator) {
3035 PartitionDesignator k;
3036
3037 assert(image);
3038
3039 /* Checks if this partition has verity signature data available that we can use. */
3040
3041 if (!image->verity_sig_ready)
3042 return false;
3043
3044 if (image->single_file_system)
3045 return partition_designator == PARTITION_ROOT;
3046
3047 k = PARTITION_VERITY_SIG_OF(partition_designator);
3048 return k >= 0 && image->partitions[k].found;
3049}
3050
18d73705
LB		 3051MountOptions* mount_options_free_all(MountOptions *options) {
3052 MountOptions *m;
3053
3054 while ((m = options)) {
3055 LIST_REMOVE(mount_options, options, m);
3056 free(m->options);
3057 free(m);
3058 }
3059
3060 return NULL;
3061}
3062
569a0e42 3063const char* mount_options_from_designator(const MountOptions *options, PartitionDesignator designator) {
f5215bc8 3064 LIST_FOREACH(mount_options, m, options)
9ece6444 3065 if (designator == m->partition_designator && !isempty(m->options))
18d73705 3066 return m->options;
6aa05ebd 3067
18d73705
LB		 3068 return NULL;
3069}
3070
6aa05ebd
LP		 3071int mount_image_privately_interactively(
3072 const char *image,
3073 DissectImageFlags flags,
3074 char **ret_directory,
e330f97a 3075 LoopDevice **ret_loop_device) {
6aa05ebd 3076
27ec815e 3077 _cleanup_(verity_settings_done) VeritySettings verity = VERITY_SETTINGS_DEFAULT;
6aa05ebd 3078 _cleanup_(loop_device_unrefp) LoopDevice *d = NULL;
6aa05ebd
LP		 3079 _cleanup_(dissected_image_unrefp) DissectedImage *dissected_image = NULL;
3080 _cleanup_(rmdir_and_freep) char *created_dir = NULL;
3081 _cleanup_free_ char *temp = NULL;
3082 int r;
3083
3084 /* Mounts an OS image at a temporary place, inside a newly created mount namespace of our own. This
3085 * is used by tools such as systemd-tmpfiles or systemd-firstboot to operate on some disk image
3086 * easily. */
3087
3088 assert(image);
3089 assert(ret_directory);
3090 assert(ret_loop_device);
6aa05ebd 3091
27ec815e
LP		 3092 r = verity_settings_load(&verity, image, NULL, NULL);
3093 if (r < 0)
3094 return log_error_errno(r, "Failed to load root hash data: %m");
3095
6aa05ebd
LP		 3096 r = tempfn_random_child(NULL, program_invocation_short_name, &temp);
3097 if (r < 0)
3098 return log_error_errno(r, "Failed to generate temporary mount directory: %m");
3099
3100 r = loop_device_make_by_path(
3101 image,
ef9c184d 3102 FLAGS_SET(flags, DISSECT_IMAGE_DEVICE_READ_ONLY) ? O_RDONLY : O_RDWR,
6aa05ebd 3103 FLAGS_SET(flags, DISSECT_IMAGE_NO_PARTITION_TABLE) ? 0 : LO_FLAGS_PARTSCAN,
7f52206a 3104 LOCK_SH,
6aa05ebd
LP		 3105 &d);
3106 if (r < 0)
7b87fe4c 3107 return log_error_errno(r, "Failed to set up loopback device for %s: %m", image);
6aa05ebd 3108
64dd3a24 3109 r = dissect_loop_device_and_warn(d, &verity, NULL, flags, &dissected_image);
6aa05ebd
LP		 3110 if (r < 0)
3111 return r;
3112
88b3300f
LP		 3113 r = dissected_image_load_verity_sig_partition(dissected_image, d->fd, &verity);
3114 if (r < 0)
3115 return r;
3116
e330f97a 3117 r = dissected_image_decrypt_interactively(dissected_image, NULL, &verity, flags);
6aa05ebd
LP		 3118 if (r < 0)
3119 return r;
3120
3121 r = detach_mount_namespace();
3122 if (r < 0)
3123 return log_error_errno(r, "Failed to detach mount namespace: %m");
3124
3125 r = mkdir_p(temp, 0700);
3126 if (r < 0)
3127 return log_error_errno(r, "Failed to create mount point: %m");
3128
3129 created_dir = TAKE_PTR(temp);
3130
21b61b1d 3131 r = dissected_image_mount_and_warn(dissected_image, created_dir, UID_INVALID, UID_INVALID, flags);
6aa05ebd 3132 if (r < 0)
af187ab2 3133 return r;
6aa05ebd 3134
41bc4849
LP		 3135 r = loop_device_flock(d, LOCK_UN);
3136 if (r < 0)
3137 return r;
3138
3044d343
YW		 3139 r = dissected_image_relinquish(dissected_image);
3140 if (r < 0)
3141 return log_error_errno(r, "Failed to relinquish DM and loopback block devices: %m");
6aa05ebd
LP		 3142
3143 *ret_directory = TAKE_PTR(created_dir);
3144 *ret_loop_device = TAKE_PTR(d);
6aa05ebd
LP		 3145
3146 return 0;
3147}
3148
8c1be37e 3149static const char *const partition_designator_table[] = {
68ac5118
ZJS		 3150 [PARTITION_ROOT] = "root",
3151 [PARTITION_ROOT_SECONDARY] = "root-secondary",
3152 [PARTITION_ROOT_OTHER] = "root-other",
3153 [PARTITION_USR] = "usr",
3154 [PARTITION_USR_SECONDARY] = "usr-secondary",
3155 [PARTITION_USR_OTHER] = "usr-other",
3156 [PARTITION_HOME] = "home",
3157 [PARTITION_SRV] = "srv",
3158 [PARTITION_ESP] = "esp",
3159 [PARTITION_XBOOTLDR] = "xbootldr",
3160 [PARTITION_SWAP] = "swap",
3161 [PARTITION_ROOT_VERITY] = "root-verity",
3162 [PARTITION_ROOT_SECONDARY_VERITY] = "root-secondary-verity",
3163 [PARTITION_ROOT_OTHER_VERITY] = "root-other-verity",
3164 [PARTITION_USR_VERITY] = "usr-verity",
3165 [PARTITION_USR_SECONDARY_VERITY] = "usr-secondary-verity",
3166 [PARTITION_USR_OTHER_VERITY] = "usr-other-verity",
3167 [PARTITION_ROOT_VERITY_SIG] = "root-verity-sig",
8ee9615e 3168 [PARTITION_ROOT_SECONDARY_VERITY_SIG] = "root-secondary-verity-sig",
68ac5118
ZJS		 3169 [PARTITION_ROOT_OTHER_VERITY_SIG] = "root-other-verity-sig",
3170 [PARTITION_USR_VERITY_SIG] = "usr-verity-sig",
3171 [PARTITION_USR_SECONDARY_VERITY_SIG] = "usr-secondary-verity-sig",
3172 [PARTITION_USR_OTHER_VERITY_SIG] = "usr-other-verity-sig",
3173 [PARTITION_TMP] = "tmp",
3174 [PARTITION_VAR] = "var",
8c1be37e
LP		 3175};
3176
06768b90
LB		 3177static bool mount_options_relax_extension_release_checks(const MountOptions *options) {
3178 if (!options)
3179 return false;
3180
3181 return string_contains_word(mount_options_from_designator(options, PARTITION_ROOT), ",", "x-systemd.relax-extension-release-check") ||
3182 string_contains_word(mount_options_from_designator(options, PARTITION_USR), ",", "x-systemd.relax-extension-release-check") ||
3183 string_contains_word(options->options, ",", "x-systemd.relax-extension-release-check");
3184}
3185
93f59701 3186int verity_dissect_and_mount(
cedf5b1a 3187 int src_fd,
93f59701
LB		 3188 const char *src,
3189 const char *dest,
3190 const MountOptions *options,
3191 const char *required_host_os_release_id,
3192 const char *required_host_os_release_version_id,
60c5f700
LP		 3193 const char *required_host_os_release_sysext_level,
3194 const char *required_sysext_scope) {
93f59701 3195
4beda316 3196 _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL;
4beda316
LB		 3197 _cleanup_(dissected_image_unrefp) DissectedImage *dissected_image = NULL;
3198 _cleanup_(verity_settings_done) VeritySettings verity = VERITY_SETTINGS_DEFAULT;
3199 DissectImageFlags dissect_image_flags;
06768b90 3200 bool relax_extension_release_check;
4beda316
LB		 3201 int r;
3202
3203 assert(src);
3204 assert(dest);
3205
06768b90
LB		 3206 relax_extension_release_check = mount_options_relax_extension_release_checks(options);
3207
cedf5b1a 3208 /* We might get an FD for the image, but we use the original path to look for the dm-verity files */
4beda316
LB		 3209 r = verity_settings_load(&verity, src, NULL, NULL);
3210 if (r < 0)
3211 return log_debug_errno(r, "Failed to load root hash: %m");
3212
06768b90
LB		 3213 dissect_image_flags = (verity.data_path ? DISSECT_IMAGE_NO_PARTITION_TABLE : 0) |
3214 (relax_extension_release_check ? DISSECT_IMAGE_RELAX_SYSEXT_CHECK : 0);
4beda316 3215
cedf5b1a
LB		 3216 /* Note that we don't use loop_device_make here, as the FD is most likely O_PATH which would not be
3217 * accepted by LOOP_CONFIGURE, so just let loop_device_make_by_path reopen it as a regular FD. */
4beda316 3218 r = loop_device_make_by_path(
cedf5b1a 3219 src_fd >= 0 ? FORMAT_PROC_FD_PATH(src_fd) : src,
4beda316
LB		 3220 -1,
3221 verity.data_path ? 0 : LO_FLAGS_PARTSCAN,
7f52206a 3222 LOCK_SH,
4beda316
LB		 3223 &loop_device);
3224 if (r < 0)
3225 return log_debug_errno(r, "Failed to create loop device for image: %m");
3226
bad31660
YW		 3227 r = dissect_loop_device(
3228 loop_device,
4beda316
LB		 3229 &verity,
3230 options,
3231 dissect_image_flags,
3232 &dissected_image);
3233 /* No partition table? Might be a single-filesystem image, try again */
3234 if (!verity.data_path && r == -ENOPKG)
bad31660
YW		 3235 r = dissect_loop_device(
3236 loop_device,
4beda316
LB		 3237 &verity,
3238 options,
75dc190d 3239 dissect_image_flags | DISSECT_IMAGE_NO_PARTITION_TABLE,
4beda316
LB		 3240 &dissected_image);
3241 if (r < 0)
3242 return log_debug_errno(r, "Failed to dissect image: %m");
3243
88b3300f
LP		 3244 r = dissected_image_load_verity_sig_partition(dissected_image, loop_device->fd, &verity);
3245 if (r < 0)
3246 return r;
3247
4beda316
LB		 3248 r = dissected_image_decrypt(
3249 dissected_image,
3250 NULL,
3251 &verity,
e330f97a 3252 dissect_image_flags);
4beda316
LB		 3253 if (r < 0)
3254 return log_debug_errno(r, "Failed to decrypt dissected image: %m");
3255
3256 r = mkdir_p_label(dest, 0755);
3257 if (r < 0)
3258 return log_debug_errno(r, "Failed to create destination directory %s: %m", dest);
3259 r = umount_recursive(dest, 0);
3260 if (r < 0)
3261 return log_debug_errno(r, "Failed to umount under destination directory %s: %m", dest);
3262
21b61b1d 3263 r = dissected_image_mount(dissected_image, dest, UID_INVALID, UID_INVALID, dissect_image_flags);
4beda316
LB		 3264 if (r < 0)
3265 return log_debug_errno(r, "Failed to mount image: %m");
3266
41bc4849
LP		 3267 r = loop_device_flock(loop_device, LOCK_UN);
3268 if (r < 0)
3269 return log_debug_errno(r, "Failed to unlock loopback device: %m");
3270
93f59701
LB		 3271 /* If we got os-release values from the caller, then we need to match them with the image's
3272 * extension-release.d/ content. Return -EINVAL if there's any mismatch.
3273 * First, check the distro ID. If that matches, then check the new SYSEXT_LEVEL value if
37361f46
LB		 3274 * available, or else fallback to VERSION_ID. If neither is present (eg: rolling release),
3275 * then a simple match on the ID will be performed. */
8b2dcbbd 3276 if (required_host_os_release_id) {
93f59701
LB		 3277 _cleanup_strv_free_ char **extension_release = NULL;
3278
d30d86b7
YW		 3279 assert(!isempty(required_host_os_release_id));
3280
06768b90 3281 r = load_extension_release_pairs(dest, dissected_image->image_name, relax_extension_release_check, &extension_release);
93f59701
LB		 3282 if (r < 0)
3283 return log_debug_errno(r, "Failed to parse image %s extension-release metadata: %m", dissected_image->image_name);
3284
3285 r = extension_release_validate(
60c5f700
LP		 3286 dissected_image->image_name,
3287 required_host_os_release_id,
3288 required_host_os_release_version_id,
3289 required_host_os_release_sysext_level,
3290 required_sysext_scope,
3291 extension_release);
93f59701
LB		 3292 if (r == 0)
3293 return log_debug_errno(SYNTHETIC_ERRNO(ESTALE), "Image %s extension-release metadata does not match the root's", dissected_image->image_name);
3294 if (r < 0)
3295 return log_debug_errno(r, "Failed to compare image %s extension-release metadata with the root's os-release: %m", dissected_image->image_name);
3296 }
3297
3044d343
YW		 3298 r = dissected_image_relinquish(dissected_image);
3299 if (r < 0)
3300 return log_debug_errno(r, "Failed to relinquish dissected image: %m");
4beda316
LB		 3301
3302 return 0;
3303}
3304
569a0e42 3305DEFINE_STRING_TABLE_LOOKUP(partition_designator, PartitionDesignator);
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