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loop-util: introduce reference counter for LoopDevice
[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
0f7c9a3d
LP		 129static void check_partition_flags(
130 const char *node,
131 unsigned long long pflags,
132 unsigned long long supported) {
133
134 assert(node);
135
136 /* Mask away all flags supported by this partition's type and the three flags the UEFI spec defines generically */
137 pflags &= ~(supported | GPT_FLAG_REQUIRED_PARTITION | GPT_FLAG_NO_BLOCK_IO_PROTOCOL | GPT_FLAG_LEGACY_BIOS_BOOTABLE);
138
139 if (pflags == 0)
140 return;
141
142 /* If there are other bits set, then log about it, to make things discoverable */
143 for (unsigned i = 0; i < sizeof(pflags) * 8; i++) {
144 unsigned long long bit = 1ULL << i;
145 if (!FLAGS_SET(pflags, bit))
146 continue;
147
148 log_debug("Unexpected partition flag %llu set on %s!", bit, node);
149 }
150}
1b010ae7 151#endif
0f7c9a3d 152
234c2e16 153static void dissected_partition_done(DissectedPartition *p) {
1b010ae7 154 assert(p);
786e3a52 155
1b010ae7
LP		 156 free(p->fstype);
157 free(p->node);
158 free(p->label);
159 free(p->decrypted_fstype);
160 free(p->decrypted_node);
161 free(p->mount_options);
786e3a52 162
1b010ae7
LP		 163 *p = (DissectedPartition) {
164 .partno = -1,
165 .architecture = _ARCHITECTURE_INVALID,
166 };
167}
786e3a52 168
1b010ae7 169#if HAVE_BLKID
1b010ae7
LP		 170static int make_partition_devname(
171 const char *whole_devname,
172 int nr,
173 char **ret) {
786e3a52 174
1b010ae7 175 bool need_p;
786e3a52 176
1b010ae7
LP		 177 assert(whole_devname);
178 assert(nr > 0);
aae22eb3 179
1b010ae7
LP		 180 /* Given a whole block device node name (e.g. /dev/sda or /dev/loop7) generate a partition device
181 * name (e.g. /dev/sda7 or /dev/loop7p5). The rule the kernel uses is simple: if whole block device
182 * node name ends in a digit, then suffix a 'p', followed by the partition number. Otherwise, just
183 * suffix the partition number without any 'p'. */
4ba86848 184
1b010ae7
LP		 185 if (isempty(whole_devname)) /* Make sure there *is* a last char */
186 return -EINVAL;
08fe0a53 187
ff25d338 188 need_p = ascii_isdigit(whole_devname[strlen(whole_devname)-1]); /* Last char a digit? */
08fe0a53 189
1b010ae7 190 return asprintf(ret, "%s%s%i", whole_devname, need_p ? "p" : "", nr);
08fe0a53 191}
1b010ae7 192#endif
08fe0a53 193
4526113f
LP		 194int dissect_image(
195 int fd,
0b214aa0 196 const char *devname,
369de26f 197 const char *image_path,
89e62e0b 198 const VeritySettings *verity,
18d73705 199 const MountOptions *mount_options,
4526113f
LP		 200 DissectImageFlags flags,
201 DissectedImage **ret) {
8c1be37e 202
349cc4a5 203#if HAVE_BLKID
62ea0ed0 204 sd_id128_t root_uuid = SD_ID128_NULL, root_verity_uuid = SD_ID128_NULL;
62ea0ed0 205 sd_id128_t usr_uuid = SD_ID128_NULL, usr_verity_uuid = SD_ID128_NULL;
1f8fb21c 206 bool is_gpt, is_mbr, multiple_generic = false,
de98f631
LP		 207 generic_rw = false, /* initialize to appease gcc */
208 generic_growfs = false;
8c1be37e 209 _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL;
8e766630 210 _cleanup_(blkid_free_probep) blkid_probe b = NULL;
8c1be37e 211 _cleanup_free_ char *generic_node = NULL;
be30ad41 212 sd_id128_t generic_uuid = SD_ID128_NULL;
0b214aa0 213 const char *pttype = NULL;
8c1be37e 214 blkid_partlist pl;
1f8fb21c 215 int r, generic_nr = -1, n_partitions;
8c1be37e
LP		 216
217 assert(fd >= 0);
0b214aa0 218 assert(devname);
8c1be37e 219 assert(ret);
a0bff7ea 220 assert(!verity || verity->designator < 0 || IN_SET(verity->designator, PARTITION_ROOT, PARTITION_USR));
89e62e0b 221 assert(!verity || verity->root_hash || verity->root_hash_size == 0);
a0bff7ea
LP		 222 assert(!verity || verity->root_hash_sig || verity->root_hash_sig_size == 0);
223 assert(!verity || (verity->root_hash || !verity->root_hash_sig));
e7cbe5cb 224 assert(!((flags & DISSECT_IMAGE_GPT_ONLY) && (flags & DISSECT_IMAGE_NO_PARTITION_TABLE)));
8c1be37e
LP		 225
226 /* Probes a disk image, and returns information about what it found in *ret.
227 *
4623e8e6 228 * Returns -ENOPKG if no suitable partition table or file system could be found.
2679f407
LP		 229 * Returns -EADDRNOTAVAIL if a root hash was specified but no matching root/verity partitions found.
230 * Returns -ENXIO if we couldn't find any partition suitable as root or /usr partition
231 * Returns -ENOTUNIQ if we only found multiple generic partitions and thus don't know what to do with that */
4623e8e6 232
89e62e0b 233 if (verity && verity->root_hash) {
aee36b4e
LP		 234 sd_id128_t fsuuid, vuuid;
235
236 /* If a root hash is supplied, then we use the root partition that has a UUID that match the
237 * first 128bit of the root hash. And we use the verity partition that has a UUID that match
238 * the final 128bit. */
4623e8e6 239
89e62e0b 240 if (verity->root_hash_size < sizeof(sd_id128_t))
4623e8e6
LP		 241 return -EINVAL;
242
aee36b4e
LP		 243 memcpy(&fsuuid, verity->root_hash, sizeof(sd_id128_t));
244 memcpy(&vuuid, (const uint8_t*) verity->root_hash + verity->root_hash_size - sizeof(sd_id128_t), sizeof(sd_id128_t));
4623e8e6 245
aee36b4e 246 if (sd_id128_is_null(fsuuid))
4623e8e6 247 return -EINVAL;
aee36b4e 248 if (sd_id128_is_null(vuuid))
4623e8e6 249 return -EINVAL;
aee36b4e
LP		 250
251 /* If the verity data declares it's for the /usr partition, then search for that, in all
252 * other cases assume it's for the root partition. */
253 if (verity->designator == PARTITION_USR) {
254 usr_uuid = fsuuid;
255 usr_verity_uuid = vuuid;
256 } else {
257 root_uuid = fsuuid;
258 root_verity_uuid = vuuid;
259 }
4623e8e6 260 }
8c1be37e 261
8c1be37e
LP		 262 b = blkid_new_probe();
263 if (!b)
264 return -ENOMEM;
265
266 errno = 0;
267 r = blkid_probe_set_device(b, fd, 0, 0);
b382db9f 268 if (r != 0)
66855de7 269 return errno_or_else(ENOMEM);
8c1be37e 270
9b6deb03
LP		 271 if ((flags & DISSECT_IMAGE_GPT_ONLY) == 0) {
272 /* Look for file system superblocks, unless we only shall look for GPT partition tables */
273 blkid_probe_enable_superblocks(b, 1);
274 blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE|BLKID_SUBLKS_USAGE);
275 }
276
8c1be37e
LP		 277 blkid_probe_enable_partitions(b, 1);
278 blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
279
280 errno = 0;
281 r = blkid_do_safeprobe(b);
59ba6d0c
LP		 282 if (IN_SET(r, -2, 1))
283 return log_debug_errno(SYNTHETIC_ERRNO(ENOPKG), "Failed to identify any partition table.");
b382db9f 284 if (r != 0)
66855de7 285 return errno_or_else(EIO);
8c1be37e 286
a4e0d617 287 m = new(DissectedImage, 1);
8c1be37e
LP		 288 if (!m)
289 return -ENOMEM;
290
a4e0d617
LP		 291 *m = (DissectedImage) {
292 .has_init_system = -1,
293 };
294
369de26f
YW		 295 if (image_path) {
296 _cleanup_free_ char *extracted_filename = NULL, *name_stripped = NULL;
297
298 r = path_extract_filename(image_path, &extracted_filename);
299 if (r < 0)
300 return r;
301
302 r = raw_strip_suffixes(extracted_filename, &name_stripped);
593fe6c0
LB		 303 if (r < 0)
304 return r;
369de26f
YW		 305
306 if (!image_name_is_valid(name_stripped))
307 log_debug("Image name %s is not valid, ignoring.", strna(name_stripped));
308 else
309 m->image_name = TAKE_PTR(name_stripped);
593fe6c0 310 }
369de26f 311
e7cbe5cb 312 if ((!(flags & DISSECT_IMAGE_GPT_ONLY) &&
4b5de5dd 313 (flags & DISSECT_IMAGE_GENERIC_ROOT)) ||
e7cbe5cb 314 (flags & DISSECT_IMAGE_NO_PARTITION_TABLE)) {
9b6deb03 315 const char *usage = NULL;
8c1be37e 316
aee36b4e
LP		 317 /* If flags permit this, also allow using non-partitioned single-filesystem images */
318
9b6deb03
LP		 319 (void) blkid_probe_lookup_value(b, "USAGE", &usage, NULL);
320 if (STRPTR_IN_SET(usage, "filesystem", "crypto")) {
18d73705 321 _cleanup_free_ char *t = NULL, *n = NULL, *o = NULL;
1b010ae7 322 const char *fstype = NULL, *options = NULL;
8c1be37e 323
9b6deb03
LP		 324 /* OK, we have found a file system, that's our root partition then. */
325 (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
8c1be37e 326
9b6deb03
LP		 327 if (fstype) {
328 t = strdup(fstype);
329 if (!t)
330 return -ENOMEM;
331 }
332
6c544d14
LP		 333 n = strdup(devname);
334 if (!n)
335 return -ENOMEM;
336
e7cbe5cb 337 m->single_file_system = true;
c3c88d67
LP		 338 m->encrypted = streq_ptr(fstype, "crypto_LUKS");
339
340 m->has_verity = verity && verity->data_path;
341 m->verity_ready = m->has_verity &&
342 verity->root_hash &&
343 (verity->designator < 0 || verity->designator == PARTITION_ROOT);
e7cbe5cb 344
8ee9615e
LP		 345 m->has_verity_sig = false; /* signature not embedded, must be specified */
346 m->verity_sig_ready = m->verity_ready &&
347 verity->root_hash_sig;
348
f5215bc8 349 options = mount_options_from_designator(mount_options, PARTITION_ROOT);
18d73705
LB		 350 if (options) {
351 o = strdup(options);
352 if (!o)
353 return -ENOMEM;
354 }
355
9b6deb03
LP		 356 m->partitions[PARTITION_ROOT] = (DissectedPartition) {
357 .found = true,
e0d53d52 358 .rw = !m->verity_ready && !fstype_is_ro(fstype),
9b6deb03
LP		 359 .partno = -1,
360 .architecture = _ARCHITECTURE_INVALID,
1cc6c93a
YW		 361 .fstype = TAKE_PTR(t),
362 .node = TAKE_PTR(n),
18d73705 363 .mount_options = TAKE_PTR(o),
88b3300f
LP		 364 .offset = 0,
365 .size = UINT64_MAX,
9b6deb03 366 };
8c1be37e 367
1cc6c93a 368 *ret = TAKE_PTR(m);
9b6deb03
LP		 369 return 0;
370 }
8c1be37e
LP		 371 }
372
373 (void) blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL);
374 if (!pttype)
375 return -ENOPKG;
376
377 is_gpt = streq_ptr(pttype, "gpt");
378 is_mbr = streq_ptr(pttype, "dos");
379
9b6deb03 380 if (!is_gpt && ((flags & DISSECT_IMAGE_GPT_ONLY) || !is_mbr))
8c1be37e
LP		 381 return -ENOPKG;
382
0903fd26
LP		 383 /* We support external verity data partitions only if the image has no partition table */
384 if (verity && verity->data_path)
385 return -EBADR;
386
4ba86848
LP		 387 /* Safety check: refuse block devices that carry a partition table but for which the kernel doesn't
388 * do partition scanning. */
389 r = blockdev_partscan_enabled(fd);
390 if (r < 0)
391 return r;
392 if (r == 0)
393 return -EPROTONOSUPPORT;
394
8c1be37e
LP		 395 errno = 0;
396 pl = blkid_probe_get_partitions(b);
b382db9f 397 if (!pl)
66855de7 398 return errno_or_else(ENOMEM);
8c1be37e 399
4ba86848
LP		 400 errno = 0;
401 n_partitions = blkid_partlist_numof_partitions(pl);
402 if (n_partitions < 0)
403 return errno_or_else(EIO);
8c1be37e 404
4ba86848 405 for (int i = 0; i < n_partitions; i++) {
1b010ae7 406 _cleanup_free_ char *node = NULL;
9b6deb03 407 unsigned long long pflags;
88b3300f 408 blkid_loff_t start, size;
8c1be37e 409 blkid_partition pp;
8c1be37e
LP		 410 int nr;
411
4ba86848
LP		 412 errno = 0;
413 pp = blkid_partlist_get_partition(pl, i);
414 if (!pp)
415 return errno_or_else(EIO);
aae22eb3 416
9b6deb03 417 pflags = blkid_partition_get_flags(pp);
8c1be37e 418
4ba86848 419 errno = 0;
8c1be37e
LP		 420 nr = blkid_partition_get_partno(pp);
421 if (nr < 0)
4ba86848 422 return errno_or_else(EIO);
8c1be37e 423
88b3300f
LP		 424 errno = 0;
425 start = blkid_partition_get_start(pp);
426 if (start < 0)
427 return errno_or_else(EIO);
428
429 assert((uint64_t) start < UINT64_MAX/512);
430
431 errno = 0;
432 size = blkid_partition_get_size(pp);
433 if (size < 0)
434 return errno_or_else(EIO);
435
436 assert((uint64_t) size < UINT64_MAX/512);
437
1b010ae7
LP		 438 r = make_partition_devname(devname, nr, &node);
439 if (r < 0)
440 return r;
441
442 /* So here's the thing: after the main ("whole") block device popped up it might take a while
443 * before the kernel fully probed the partition table. Waiting for that to finish is icky in
444 * userspace. So here's what we do instead. We issue the BLKPG_ADD_PARTITION ioctl to add the
445 * partition ourselves, racing against the kernel. Good thing is: if this call fails with
446 * EBUSY then the kernel was quicker than us, and that's totally OK, the outcome is good for
447 * us: the device node will exist. If OTOH our call was successful we won the race. Which is
448 * also good as the outcome is the same: the partition block device exists, and we can use
449 * it.
450 *
451 * Kernel returns EBUSY if there's already a partition by that number or an overlapping
452 * partition already existent. */
453
d25697f5 454 r = block_device_add_partition(fd, node, nr, (uint64_t) start * 512, (uint64_t) size * 512);
1b010ae7
LP		 455 if (r < 0) {
456 if (r != -EBUSY)
457 return log_debug_errno(r, "BLKPG_ADD_PARTITION failed: %m");
458
459 log_debug_errno(r, "Kernel was quicker than us in adding partition %i.", nr);
460 } else
461 log_debug("We were quicker than kernel in adding partition %i.", nr);
462
8c1be37e 463 if (is_gpt) {
569a0e42 464 PartitionDesignator designator = _PARTITION_DESIGNATOR_INVALID;
6b41a7b2 465 Architecture architecture = _ARCHITECTURE_INVALID;
08fe0a53 466 const char *stype, *sid, *fstype = NULL, *label;
4623e8e6 467 sd_id128_t type_id, id;
de98f631 468 bool rw = true, growfs = false;
8c1be37e 469
4623e8e6
LP		 470 sid = blkid_partition_get_uuid(pp);
471 if (!sid)
472 continue;
473 if (sd_id128_from_string(sid, &id) < 0)
474 continue;
475
8c1be37e
LP		 476 stype = blkid_partition_get_type_string(pp);
477 if (!stype)
478 continue;
8c1be37e
LP		 479 if (sd_id128_from_string(stype, &type_id) < 0)
480 continue;
481
08fe0a53
LP		 482 label = blkid_partition_get_name(pp); /* libblkid returns NULL here if empty */
483
8c1be37e 484 if (sd_id128_equal(type_id, GPT_HOME)) {
a48dd347 485
de98f631 486 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY|GPT_FLAG_GROWFS);
0f7c9a3d 487
a48dd347
LP		 488 if (pflags & GPT_FLAG_NO_AUTO)
489 continue;
490
8c1be37e 491 designator = PARTITION_HOME;
9b6deb03 492 rw = !(pflags & GPT_FLAG_READ_ONLY);
de98f631 493 growfs = FLAGS_SET(pflags, GPT_FLAG_GROWFS);
aee36b4e 494
8c1be37e 495 } else if (sd_id128_equal(type_id, GPT_SRV)) {
a48dd347 496
de98f631 497 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY|GPT_FLAG_GROWFS);
0f7c9a3d 498
a48dd347
LP		 499 if (pflags & GPT_FLAG_NO_AUTO)
500 continue;
501
8c1be37e 502 designator = PARTITION_SRV;
9b6deb03 503 rw = !(pflags & GPT_FLAG_READ_ONLY);
de98f631 504 growfs = FLAGS_SET(pflags, GPT_FLAG_GROWFS);
aee36b4e 505
8c1be37e 506 } else if (sd_id128_equal(type_id, GPT_ESP)) {
a48dd347 507
aee36b4e
LP		 508 /* Note that we don't check the GPT_FLAG_NO_AUTO flag for the ESP, as it is
509 * not defined there. We instead check the GPT_FLAG_NO_BLOCK_IO_PROTOCOL, as
510 * recommended by the UEFI spec (See "12.3.3 Number and Location of System
511 * Partitions"). */
a48dd347
LP		 512
513 if (pflags & GPT_FLAG_NO_BLOCK_IO_PROTOCOL)
514 continue;
515
8c1be37e
LP		 516 designator = PARTITION_ESP;
517 fstype = "vfat";
a8c47660
LP		 518
519 } else if (sd_id128_equal(type_id, GPT_XBOOTLDR)) {
520
de98f631 521 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY|GPT_FLAG_GROWFS);
0f7c9a3d 522
a8c47660
LP		 523 if (pflags & GPT_FLAG_NO_AUTO)
524 continue;
525
526 designator = PARTITION_XBOOTLDR;
527 rw = !(pflags & GPT_FLAG_READ_ONLY);
de98f631 528 growfs = FLAGS_SET(pflags, GPT_FLAG_GROWFS);
49ae9d91
DDM		 529
530 } else if (gpt_partition_type_is_root(type_id)) {
4623e8e6 531
de98f631 532 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY|GPT_FLAG_GROWFS);
0f7c9a3d 533
a48dd347
LP		 534 if (pflags & GPT_FLAG_NO_AUTO)
535 continue;
536
4623e8e6
LP		 537 /* If a root ID is specified, ignore everything but the root id */
538 if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id))
539 continue;
540
49ae9d91
DDM		 541 assert_se((architecture = gpt_partition_type_uuid_to_arch(type_id)) >= 0);
542 designator = PARTITION_ROOT_OF_ARCH(architecture);
9b6deb03 543 rw = !(pflags & GPT_FLAG_READ_ONLY);
de98f631 544 growfs = FLAGS_SET(pflags, GPT_FLAG_GROWFS);
aee36b4e 545
49ae9d91 546 } else if (gpt_partition_type_is_root_verity(type_id)) {
4623e8e6 547
0f7c9a3d
LP		 548 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
549
a48dd347
LP		 550 if (pflags & GPT_FLAG_NO_AUTO)
551 continue;
552
c3c88d67 553 m->has_verity = true;
4623e8e6 554
8ee9615e
LP		 555 /* If no verity configuration is specified, then don't do verity */
556 if (!verity)
557 continue;
558 if (verity->designator >= 0 && verity->designator != PARTITION_ROOT)
559 continue;
560
561 /* If root hash is specified, then ignore everything but the root id */
562 if (!sd_id128_is_null(root_verity_uuid) && !sd_id128_equal(root_verity_uuid, id))
4623e8e6
LP		 563 continue;
564
49ae9d91
DDM		 565 assert_se((architecture = gpt_partition_type_uuid_to_arch(type_id)) >= 0);
566 designator = PARTITION_VERITY_OF(PARTITION_ROOT_OF_ARCH(architecture));
4623e8e6 567 fstype = "DM_verity_hash";
4623e8e6 568 rw = false;
8ee9615e 569
49ae9d91 570 } else if (gpt_partition_type_is_root_verity_sig(type_id)) {
8ee9615e
LP		 571
572 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
573
574 if (pflags & GPT_FLAG_NO_AUTO)
575 continue;
576
577 m->has_verity_sig = true;
578
579 /* If root hash is specified explicitly, then ignore any embedded signature */
580 if (!verity)
581 continue;
582 if (verity->designator >= 0 && verity->designator != PARTITION_ROOT)
583 continue;
584 if (verity->root_hash)
585 continue;
586
49ae9d91
DDM		 587 assert_se((architecture = gpt_partition_type_uuid_to_arch(type_id)) >= 0);
588 designator = PARTITION_VERITY_SIG_OF(PARTITION_ROOT_OF_ARCH(architecture));
8ee9615e 589 fstype = "verity_hash_signature";
4623e8e6 590 rw = false;
8ee9615e 591
49ae9d91 592 } else if (gpt_partition_type_is_usr(type_id)) {
aee36b4e 593
de98f631 594 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY|GPT_FLAG_GROWFS);
aee36b4e
LP		 595
596 if (pflags & GPT_FLAG_NO_AUTO)
597 continue;
598
599 /* If a usr ID is specified, ignore everything but the usr id */
600 if (!sd_id128_is_null(usr_uuid) && !sd_id128_equal(usr_uuid, id))
601 continue;
602
49ae9d91
DDM		 603 assert_se((architecture = gpt_partition_type_uuid_to_arch(type_id)) >= 0);
604 designator = PARTITION_USR_OF_ARCH(architecture);
aee36b4e 605 rw = !(pflags & GPT_FLAG_READ_ONLY);
de98f631 606 growfs = FLAGS_SET(pflags, GPT_FLAG_GROWFS);
aee36b4e 607
49ae9d91 608 } else if (gpt_partition_type_is_usr_verity(type_id)) {
aee36b4e
LP		 609
610 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
611
612 if (pflags & GPT_FLAG_NO_AUTO)
613 continue;
614
c3c88d67 615 m->has_verity = true;
aee36b4e 616
8ee9615e
LP		 617 if (!verity)
618 continue;
619 if (verity->designator >= 0 && verity->designator != PARTITION_USR)
620 continue;
621
622 /* If usr hash is specified, then ignore everything but the usr id */
623 if (!sd_id128_is_null(usr_verity_uuid) && !sd_id128_equal(usr_verity_uuid, id))
aee36b4e
LP		 624 continue;
625
49ae9d91
DDM		 626 assert_se((architecture = gpt_partition_type_uuid_to_arch(type_id)) >= 0);
627 designator = PARTITION_VERITY_OF(PARTITION_USR_OF_ARCH(architecture));
aee36b4e 628 fstype = "DM_verity_hash";
aee36b4e 629 rw = false;
8ee9615e 630
49ae9d91 631 } else if (gpt_partition_type_is_usr_verity_sig(type_id)) {
8ee9615e
LP		 632
633 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
634
635 if (pflags & GPT_FLAG_NO_AUTO)
636 continue;
637
638 m->has_verity_sig = true;
639
640 /* If usr hash is specified explicitly, then ignore any embedded signature */
641 if (!verity)
642 continue;
643 if (verity->designator >= 0 && verity->designator != PARTITION_USR)
644 continue;
645 if (verity->root_hash)
646 continue;
647
49ae9d91
DDM		 648 assert_se((architecture = gpt_partition_type_uuid_to_arch(type_id)) >= 0);
649 designator = PARTITION_VERITY_SIG_OF(PARTITION_USR_OF_ARCH(architecture));
8ee9615e 650 fstype = "verity_hash_signature";
aee36b4e 651 rw = false;
8ee9615e 652
49ae9d91 653 } else if (sd_id128_equal(type_id, GPT_SWAP)) {
a48dd347 654
0f7c9a3d
LP		 655 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO);
656
a48dd347
LP		 657 if (pflags & GPT_FLAG_NO_AUTO)
658 continue;
659
8c1be37e 660 designator = PARTITION_SWAP;
aee36b4e 661
8c1be37e
LP		 662 } else if (sd_id128_equal(type_id, GPT_LINUX_GENERIC)) {
663
de98f631 664 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY|GPT_FLAG_GROWFS);
0f7c9a3d 665
a48dd347
LP		 666 if (pflags & GPT_FLAG_NO_AUTO)
667 continue;
668
8c1be37e
LP		 669 if (generic_node)
670 multiple_generic = true;
671 else {
672 generic_nr = nr;
9b6deb03 673 generic_rw = !(pflags & GPT_FLAG_READ_ONLY);
de98f631 674 generic_growfs = FLAGS_SET(pflags, GPT_FLAG_GROWFS);
be30ad41 675 generic_uuid = id;
8c1be37e
LP		 676 generic_node = strdup(node);
677 if (!generic_node)
678 return -ENOMEM;
679 }
d4dffb85
LP		 680
681 } else if (sd_id128_equal(type_id, GPT_TMP)) {
682
de98f631 683 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY|GPT_FLAG_GROWFS);
0f7c9a3d 684
d4dffb85
LP		 685 if (pflags & GPT_FLAG_NO_AUTO)
686 continue;
687
688 designator = PARTITION_TMP;
689 rw = !(pflags & GPT_FLAG_READ_ONLY);
de98f631 690 growfs = FLAGS_SET(pflags, GPT_FLAG_GROWFS);
d4dffb85
LP		 691
692 } else if (sd_id128_equal(type_id, GPT_VAR)) {
693
de98f631 694 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY|GPT_FLAG_GROWFS);
0f7c9a3d 695
d4dffb85
LP		 696 if (pflags & GPT_FLAG_NO_AUTO)
697 continue;
698
699 if (!FLAGS_SET(flags, DISSECT_IMAGE_RELAX_VAR_CHECK)) {
700 sd_id128_t var_uuid;
701
702 /* For /var we insist that the uuid of the partition matches the
703 * HMAC-SHA256 of the /var GPT partition type uuid, keyed by machine
704 * ID. Why? Unlike the other partitions /var is inherently
705 * installation specific, hence we need to be careful not to mount it
706 * in the wrong installation. By hashing the partition UUID from
707 * /etc/machine-id we can securely bind the partition to the
708 * installation. */
709
710 r = sd_id128_get_machine_app_specific(GPT_VAR, &var_uuid);
711 if (r < 0)
712 return r;
713
714 if (!sd_id128_equal(var_uuid, id)) {
715 log_debug("Found a /var/ partition, but its UUID didn't match our expectations, ignoring.");
716 continue;
717 }
718 }
719
720 designator = PARTITION_VAR;
721 rw = !(pflags & GPT_FLAG_READ_ONLY);
de98f631 722 growfs = FLAGS_SET(pflags, GPT_FLAG_GROWFS);
8c1be37e
LP		 723 }
724
725 if (designator != _PARTITION_DESIGNATOR_INVALID) {
0fb5036f 726 _cleanup_free_ char *t = NULL, *o = NULL, *l = NULL;
18d73705 727 const char *options = NULL;
8c1be37e 728
08fe0a53
LP		 729 if (m->partitions[designator].found) {
730 /* For most partition types the first one we see wins. Except for the
731 * rootfs and /usr, where we do a version compare of the label, and
732 * let the newest version win. This permits a simple A/B versioning
733 * scheme in OS images. */
734
735 if (!PARTITION_DESIGNATOR_VERSIONED(designator) ||
234c2e16 736 strverscmp_improved(m->partitions[designator].label, label) >= 0)
08fe0a53
LP		 737 continue;
738
234c2e16 739 dissected_partition_done(m->partitions + designator);
08fe0a53 740 }
8c1be37e
LP		 741
742 if (fstype) {
743 t = strdup(fstype);
744 if (!t)
745 return -ENOMEM;
746 }
747
08fe0a53
LP		 748 if (label) {
749 l = strdup(label);
750 if (!l)
751 return -ENOMEM;
752 }
753
f5215bc8 754 options = mount_options_from_designator(mount_options, designator);
18d73705
LB		 755 if (options) {
756 o = strdup(options);
757 if (!o)
758 return -ENOMEM;
759 }
760
8c1be37e
LP		 761 m->partitions[designator] = (DissectedPartition) {
762 .found = true,
763 .partno = nr,
764 .rw = rw,
de98f631 765 .growfs = growfs,
8c1be37e 766 .architecture = architecture,
0fb5036f 767 .node = TAKE_PTR(node),
1cc6c93a 768 .fstype = TAKE_PTR(t),
08fe0a53 769 .label = TAKE_PTR(l),
be30ad41 770 .uuid = id,
18d73705 771 .mount_options = TAKE_PTR(o),
88b3300f
LP		 772 .offset = (uint64_t) start * 512,
773 .size = (uint64_t) size * 512,
8c1be37e 774 };
8c1be37e
LP		 775 }
776
777 } else if (is_mbr) {
778
a8c47660 779 switch (blkid_partition_get_type(pp)) {
8c1be37e 780
a8c47660
LP		 781 case 0x83: /* Linux partition */
782
783 if (pflags != 0x80) /* Bootable flag */
784 continue;
8c1be37e 785
a8c47660
LP		 786 if (generic_node)
787 multiple_generic = true;
788 else {
789 generic_nr = nr;
790 generic_rw = true;
de98f631 791 generic_growfs = false;
a8c47660
LP		 792 generic_node = strdup(node);
793 if (!generic_node)
794 return -ENOMEM;
795 }
796
797 break;
798
799 case 0xEA: { /* Boot Loader Spec extended $BOOT partition */
0fb5036f 800 _cleanup_free_ char *o = NULL;
a8c47660 801 sd_id128_t id = SD_ID128_NULL;
18d73705 802 const char *sid, *options = NULL;
a8c47660
LP		 803
804 /* First one wins */
234c2e16 805 if (m->partitions[PARTITION_XBOOTLDR].found)
a8c47660
LP		 806 continue;
807
808 sid = blkid_partition_get_uuid(pp);
809 if (sid)
810 (void) sd_id128_from_string(sid, &id);
811
f5215bc8 812 options = mount_options_from_designator(mount_options, PARTITION_XBOOTLDR);
18d73705
LB		 813 if (options) {
814 o = strdup(options);
815 if (!o)
816 return -ENOMEM;
817 }
818
a8c47660
LP		 819 m->partitions[PARTITION_XBOOTLDR] = (DissectedPartition) {
820 .found = true,
821 .partno = nr,
822 .rw = true,
de98f631 823 .growfs = false,
a8c47660 824 .architecture = _ARCHITECTURE_INVALID,
0fb5036f 825 .node = TAKE_PTR(node),
a8c47660 826 .uuid = id,
18d73705 827 .mount_options = TAKE_PTR(o),
88b3300f
LP		 828 .offset = (uint64_t) start * 512,
829 .size = (uint64_t) size * 512,
a8c47660
LP		 830 };
831
832 break;
833 }}
8c1be37e
LP		 834 }
835 }
836
74cb2db9 837 if (m->partitions[PARTITION_ROOT].found) {
49ae9d91
DDM		 838 /* If we found the primary arch, then invalidate the secondary and other arch to avoid any
839 * ambiguities, since we never want to mount the secondary or other arch in this case. */
74cb2db9
LP		 840 m->partitions[PARTITION_ROOT_SECONDARY].found = false;
841 m->partitions[PARTITION_ROOT_SECONDARY_VERITY].found = false;
8ee9615e 842 m->partitions[PARTITION_ROOT_SECONDARY_VERITY_SIG].found = false;
aee36b4e
LP		 843 m->partitions[PARTITION_USR_SECONDARY].found = false;
844 m->partitions[PARTITION_USR_SECONDARY_VERITY].found = false;
8ee9615e 845 m->partitions[PARTITION_USR_SECONDARY_VERITY_SIG].found = false;
8c1be37e 846
49ae9d91
DDM		 847 m->partitions[PARTITION_ROOT_OTHER].found = false;
848 m->partitions[PARTITION_ROOT_OTHER_VERITY].found = false;
849 m->partitions[PARTITION_ROOT_OTHER_VERITY_SIG].found = false;
850 m->partitions[PARTITION_USR_OTHER].found = false;
851 m->partitions[PARTITION_USR_OTHER_VERITY].found = false;
852 m->partitions[PARTITION_USR_OTHER_VERITY_SIG].found = false;
853
8ee9615e
LP		 854 } else if (m->partitions[PARTITION_ROOT_VERITY].found ||
855 m->partitions[PARTITION_ROOT_VERITY_SIG].found)
7cf66030 856 return -EADDRNOTAVAIL; /* Verity found but no matching rootfs? Something is off, refuse. */
4623e8e6 857
7cf66030 858 else if (m->partitions[PARTITION_ROOT_SECONDARY].found) {
aee36b4e 859
7cf66030 860 /* No root partition found but there's one for the secondary architecture? Then upgrade
49ae9d91
DDM		 861 * secondary arch to first and invalidate the other arch. */
862
863 log_debug("No root partition found of the native architecture, falling back to a root "
864 "partition of the secondary architecture.");
4623e8e6 865
7cf66030
LP		 866 m->partitions[PARTITION_ROOT] = m->partitions[PARTITION_ROOT_SECONDARY];
867 zero(m->partitions[PARTITION_ROOT_SECONDARY]);
868 m->partitions[PARTITION_ROOT_VERITY] = m->partitions[PARTITION_ROOT_SECONDARY_VERITY];
869 zero(m->partitions[PARTITION_ROOT_SECONDARY_VERITY]);
8ee9615e
LP		 870 m->partitions[PARTITION_ROOT_VERITY_SIG] = m->partitions[PARTITION_ROOT_SECONDARY_VERITY_SIG];
871 zero(m->partitions[PARTITION_ROOT_SECONDARY_VERITY_SIG]);
aee36b4e 872
7cf66030
LP		 873 m->partitions[PARTITION_USR] = m->partitions[PARTITION_USR_SECONDARY];
874 zero(m->partitions[PARTITION_USR_SECONDARY]);
875 m->partitions[PARTITION_USR_VERITY] = m->partitions[PARTITION_USR_SECONDARY_VERITY];
876 zero(m->partitions[PARTITION_USR_SECONDARY_VERITY]);
8ee9615e
LP		 877 m->partitions[PARTITION_USR_VERITY_SIG] = m->partitions[PARTITION_USR_SECONDARY_VERITY_SIG];
878 zero(m->partitions[PARTITION_USR_SECONDARY_VERITY_SIG]);
e0f9e7bd 879
49ae9d91
DDM		 880 m->partitions[PARTITION_ROOT_OTHER].found = false;
881 m->partitions[PARTITION_ROOT_OTHER_VERITY].found = false;
882 m->partitions[PARTITION_ROOT_OTHER_VERITY_SIG].found = false;
883 m->partitions[PARTITION_USR_OTHER].found = false;
884 m->partitions[PARTITION_USR_OTHER_VERITY].found = false;
885 m->partitions[PARTITION_USR_OTHER_VERITY_SIG].found = false;
886
8ee9615e
LP		 887 } else if (m->partitions[PARTITION_ROOT_SECONDARY_VERITY].found ||
888 m->partitions[PARTITION_ROOT_SECONDARY_VERITY_SIG].found)
7cf66030 889 return -EADDRNOTAVAIL; /* as above */
18d73705 890
49ae9d91
DDM		 891 else if (m->partitions[PARTITION_ROOT_OTHER].found) {
892
893 /* No root or secondary partition found but there's one for another architecture? Then
894 * upgrade the other architecture to first. */
895
896 log_debug("No root partition found of the native architecture or the secondary architecture, "
897 "falling back to a root partition of a non-native architecture (%s).",
898 architecture_to_string(m->partitions[PARTITION_ROOT_OTHER].architecture));
899
900 m->partitions[PARTITION_ROOT] = m->partitions[PARTITION_ROOT_OTHER];
901 zero(m->partitions[PARTITION_ROOT_OTHER]);
902 m->partitions[PARTITION_ROOT_VERITY] = m->partitions[PARTITION_ROOT_OTHER_VERITY];
903 zero(m->partitions[PARTITION_ROOT_OTHER_VERITY]);
904 m->partitions[PARTITION_ROOT_VERITY_SIG] = m->partitions[PARTITION_ROOT_OTHER_VERITY_SIG];
905 zero(m->partitions[PARTITION_ROOT_OTHER_VERITY_SIG]);
906
907 m->partitions[PARTITION_USR] = m->partitions[PARTITION_USR_OTHER];
908 zero(m->partitions[PARTITION_USR_OTHER]);
909 m->partitions[PARTITION_USR_VERITY] = m->partitions[PARTITION_USR_OTHER_VERITY];
910 zero(m->partitions[PARTITION_USR_OTHER_VERITY]);
911 m->partitions[PARTITION_USR_VERITY_SIG] = m->partitions[PARTITION_USR_OTHER_VERITY_SIG];
912 zero(m->partitions[PARTITION_USR_OTHER_VERITY_SIG]);
913 }
914
8ee9615e
LP		 915 /* Hmm, we found a signature partition but no Verity data? Something is off. */
916 if (m->partitions[PARTITION_ROOT_VERITY_SIG].found && !m->partitions[PARTITION_ROOT_VERITY].found)
917 return -EADDRNOTAVAIL;
7cf66030 918
8ee9615e 919 if (m->partitions[PARTITION_USR].found) {
49ae9d91 920 /* Invalidate secondary and other arch /usr/ if we found the primary arch */
7cf66030
LP		 921 m->partitions[PARTITION_USR_SECONDARY].found = false;
922 m->partitions[PARTITION_USR_SECONDARY_VERITY].found = false;
8ee9615e 923 m->partitions[PARTITION_USR_SECONDARY_VERITY_SIG].found = false;
7cf66030 924
49ae9d91
DDM		 925 m->partitions[PARTITION_USR_OTHER].found = false;
926 m->partitions[PARTITION_USR_OTHER_VERITY].found = false;
927 m->partitions[PARTITION_USR_OTHER_VERITY_SIG].found = false;
928
8ee9615e
LP		 929 } else if (m->partitions[PARTITION_USR_VERITY].found ||
930 m->partitions[PARTITION_USR_VERITY_SIG].found)
7cf66030 931 return -EADDRNOTAVAIL; /* as above */
8c1be37e 932
7cf66030 933 else if (m->partitions[PARTITION_USR_SECONDARY].found) {
e0f9e7bd 934
49ae9d91
DDM		 935 log_debug("No usr partition found of the native architecture, falling back to a usr "
936 "partition of the secondary architecture.");
937
7cf66030
LP		 938 /* Upgrade secondary arch to primary */
939 m->partitions[PARTITION_USR] = m->partitions[PARTITION_USR_SECONDARY];
940 zero(m->partitions[PARTITION_USR_SECONDARY]);
941 m->partitions[PARTITION_USR_VERITY] = m->partitions[PARTITION_USR_SECONDARY_VERITY];
942 zero(m->partitions[PARTITION_USR_SECONDARY_VERITY]);
8ee9615e
LP		 943 m->partitions[PARTITION_USR_VERITY_SIG] = m->partitions[PARTITION_USR_SECONDARY_VERITY_SIG];
944 zero(m->partitions[PARTITION_USR_SECONDARY_VERITY_SIG]);
7cf66030 945
49ae9d91
DDM		 946 m->partitions[PARTITION_USR_OTHER].found = false;
947 m->partitions[PARTITION_USR_OTHER_VERITY].found = false;
948 m->partitions[PARTITION_USR_OTHER_VERITY_SIG].found = false;
949
8ee9615e
LP		 950 } else if (m->partitions[PARTITION_USR_SECONDARY_VERITY].found ||
951 m->partitions[PARTITION_USR_SECONDARY_VERITY_SIG].found)
7cf66030
LP		 952 return -EADDRNOTAVAIL; /* as above */
953
49ae9d91
DDM		 954 else if (m->partitions[PARTITION_USR_OTHER].found) {
955
956 log_debug("No usr partition found of the native architecture or the secondary architecture, "
957 "falling back to a usr partition of a non-native architecture (%s).",
958 architecture_to_string(m->partitions[PARTITION_ROOT_OTHER].architecture));
959
960 /* Upgrade other arch to primary */
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_USR_VERITY_SIG].found && !m->partitions[PARTITION_USR_VERITY].found)
971 return -EADDRNOTAVAIL;
972
cb241a69
LP		 973 /* If root and /usr are combined then insist that the architecture matches */
974 if (m->partitions[PARTITION_ROOT].found &&
975 m->partitions[PARTITION_USR].found &&
976 (m->partitions[PARTITION_ROOT].architecture >= 0 &&
977 m->partitions[PARTITION_USR].architecture >= 0 &&
978 m->partitions[PARTITION_ROOT].architecture != m->partitions[PARTITION_USR].architecture))
979 return -EADDRNOTAVAIL;
980
4ab51780
LP		 981 if (!m->partitions[PARTITION_ROOT].found &&
982 !m->partitions[PARTITION_USR].found &&
983 (flags & DISSECT_IMAGE_GENERIC_ROOT) &&
00a8b34f 984 (!verity || !verity->root_hash || verity->designator != PARTITION_USR)) {
7cf66030 985
1b010ae7 986 /* OK, we found nothing usable, then check if there's a single generic partition, and use
4b5de5dd
LP		 987 * that. If the root hash was set however, then we won't fall back to a generic node, because
988 * the root hash decides. */
7cf66030
LP		 989
990 /* If we didn't find a properly marked root partition, but we did find a single suitable
991 * generic Linux partition, then use this as root partition, if the caller asked for it. */
992 if (multiple_generic)
993 return -ENOTUNIQ;
994
4b5de5dd
LP		 995 /* If we didn't find a generic node, then we can't fix this up either */
996 if (generic_node) {
997 _cleanup_free_ char *o = NULL;
998 const char *options;
8c1be37e 999
f5215bc8 1000 options = mount_options_from_designator(mount_options, PARTITION_ROOT);
18d73705
LB		 1001 if (options) {
1002 o = strdup(options);
1003 if (!o)
1004 return -ENOMEM;
1005 }
1006
1f8fb21c 1007 assert(generic_nr >= 0);
8c1be37e
LP		 1008 m->partitions[PARTITION_ROOT] = (DissectedPartition) {
1009 .found = true,
1010 .rw = generic_rw,
de98f631 1011 .growfs = generic_growfs,
8c1be37e
LP		 1012 .partno = generic_nr,
1013 .architecture = _ARCHITECTURE_INVALID,
1cc6c93a 1014 .node = TAKE_PTR(generic_node),
be30ad41 1015 .uuid = generic_uuid,
18d73705 1016 .mount_options = TAKE_PTR(o),
88b3300f
LP		 1017 .offset = UINT64_MAX,
1018 .size = UINT64_MAX,
8c1be37e 1019 };
e0f9e7bd 1020 }
8c1be37e
LP		 1021 }
1022
4b5de5dd
LP		 1023 /* 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 */
1024 if (FLAGS_SET(flags, DISSECT_IMAGE_REQUIRE_ROOT) &&
1025 !(m->partitions[PARTITION_ROOT].found || (m->partitions[PARTITION_USR].found && FLAGS_SET(flags, DISSECT_IMAGE_USR_NO_ROOT))))
1026 return -ENXIO;
1027
7b32164f
LP		 1028 if (m->partitions[PARTITION_ROOT_VERITY].found) {
1029 /* We only support one verity partition per image, i.e. can't do for both /usr and root fs */
1030 if (m->partitions[PARTITION_USR_VERITY].found)
1031 return -ENOTUNIQ;
1032
1033 /* We don't support verity enabled root with a split out /usr. Neither with nor without
1034 * verity there. (Note that we do support verity-less root with verity-full /usr, though.) */
1035 if (m->partitions[PARTITION_USR].found)
1036 return -EADDRNOTAVAIL;
1037 }
aee36b4e 1038
1903defc
LP		 1039 if (verity) {
1040 /* If a verity designator is specified, then insist that the matching partition exists */
1041 if (verity->designator >= 0 && !m->partitions[verity->designator].found)
1042 return -EADDRNOTAVAIL;
aee36b4e 1043
1903defc 1044 if (verity->root_hash) {
8ee9615e
LP		 1045 /* If we have an explicit root hash and found the partitions for it, then we are ready to use
1046 * Verity, set things up for it */
1047
1903defc
LP		 1048 if (verity->designator < 0 || verity->designator == PARTITION_ROOT) {
1049 if (!m->partitions[PARTITION_ROOT_VERITY].found || !m->partitions[PARTITION_ROOT].found)
1050 return -EADDRNOTAVAIL;
4623e8e6 1051
1903defc
LP		 1052 /* If we found a verity setup, then the root partition is necessarily read-only. */
1053 m->partitions[PARTITION_ROOT].rw = false;
1054 m->verity_ready = true;
1903defc 1055
f9e0bb61
LP		 1056 } else {
1057 assert(verity->designator == PARTITION_USR);
1058
1903defc
LP		 1059 if (!m->partitions[PARTITION_USR_VERITY].found || !m->partitions[PARTITION_USR].found)
1060 return -EADDRNOTAVAIL;
4623e8e6 1061
1903defc
LP		 1062 m->partitions[PARTITION_USR].rw = false;
1063 m->verity_ready = true;
1064 }
8ee9615e
LP		 1065
1066 if (m->verity_ready)
b98416e1 1067 m->verity_sig_ready = verity->root_hash_sig;
8ee9615e
LP		 1068
1069 } else if (m->partitions[verity->designator == PARTITION_USR ? PARTITION_USR_VERITY_SIG : PARTITION_ROOT_VERITY_SIG].found) {
1070
1071 /* If we found an embedded signature partition, we are ready, too. */
1072
1073 m->verity_ready = m->verity_sig_ready = true;
1074 m->partitions[verity->designator == PARTITION_USR ? PARTITION_USR : PARTITION_ROOT].rw = false;
aee36b4e 1075 }
4623e8e6
LP		 1076 }
1077
18b5886e
LP		 1078 blkid_free_probe(b);
1079 b = NULL;
1080
8c1be37e 1081 /* Fill in file system types if we don't know them yet. */
569a0e42 1082 for (PartitionDesignator i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
18b5886e 1083 DissectedPartition *p = m->partitions + i;
8c1be37e 1084
18b5886e 1085 if (!p->found)
8c1be37e
LP		 1086 continue;
1087
18b5886e
LP		 1088 if (!p->fstype && p->node) {
1089 r = probe_filesystem(p->node, &p->fstype);
7cc84b2c 1090 if (r < 0 && r != -EUCLEAN)
18b5886e 1091 return r;
8c1be37e
LP		 1092 }
1093
18b5886e
LP		 1094 if (streq_ptr(p->fstype, "crypto_LUKS"))
1095 m->encrypted = true;
896f937f
LP		 1096
1097 if (p->fstype && fstype_is_ro(p->fstype))
1098 p->rw = false;
de98f631
LP		 1099
1100 if (!p->rw)
1101 p->growfs = false;
8c1be37e
LP		 1102 }
1103
1cc6c93a 1104 *ret = TAKE_PTR(m);
8c1be37e
LP		 1105 return 0;
1106#else
1107 return -EOPNOTSUPP;
1108#endif
1109}
1110
1111DissectedImage* dissected_image_unref(DissectedImage *m) {
8c1be37e
LP		 1112 if (!m)
1113 return NULL;
1114
ac1e1b5f 1115 /* First, clear dissected partitions. */
08fe0a53 1116 for (PartitionDesignator i = 0; i < _PARTITION_DESIGNATOR_MAX; i++)
234c2e16 1117 dissected_partition_done(m->partitions + i);
8c1be37e 1118
ac1e1b5f
YW		 1119 /* Second, free decrypted images. This must be after dissected_partition_done(), as freeing
1120 * DecryptedImage may try to deactivate partitions. */
1121 decrypted_image_unref(m->decrypted_image);
1122
593fe6c0 1123 free(m->image_name);
3b925504
LP		 1124 free(m->hostname);
1125 strv_free(m->machine_info);
1126 strv_free(m->os_release);
7718ac97 1127 strv_free(m->extension_release);
3b925504 1128
5fecf46d 1129 return mfree(m);
8c1be37e
LP		 1130}
1131
18b5886e 1132static int is_loop_device(const char *path) {
553e15f2 1133 char s[SYS_BLOCK_PATH_MAX("/../loop/")];
18b5886e
LP		 1134 struct stat st;
1135
1136 assert(path);
1137
1138 if (stat(path, &st) < 0)
1139 return -errno;
1140
1141 if (!S_ISBLK(st.st_mode))
1142 return -ENOTBLK;
1143
553e15f2 1144 xsprintf_sys_block_path(s, "/loop/", st.st_dev);
18b5886e
LP		 1145 if (access(s, F_OK) < 0) {
1146 if (errno != ENOENT)
1147 return -errno;
1148
1149 /* The device itself isn't a loop device, but maybe it's a partition and its parent is? */
553e15f2 1150 xsprintf_sys_block_path(s, "/../loop/", st.st_dev);
18b5886e
LP		 1151 if (access(s, F_OK) < 0)
1152 return errno == ENOENT ? false : -errno;
1153 }
1154
1155 return true;
1156}
1157
cf32c486
LP		 1158static int run_fsck(const char *node, const char *fstype) {
1159 int r, exit_status;
1160 pid_t pid;
1161
1162 assert(node);
1163 assert(fstype);
1164
1165 r = fsck_exists(fstype);
1166 if (r < 0) {
1167 log_debug_errno(r, "Couldn't determine whether fsck for %s exists, proceeding anyway.", fstype);
1168 return 0;
1169 }
1170 if (r == 0) {
1171 log_debug("Not checking partition %s, as fsck for %s does not exist.", node, fstype);
1172 return 0;
1173 }
1174
1175 r = safe_fork("(fsck)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_RLIMIT_NOFILE_SAFE|FORK_DEATHSIG|FORK_NULL_STDIO, &pid);
1176 if (r < 0)
1177 return log_debug_errno(r, "Failed to fork off fsck: %m");
1178 if (r == 0) {
1179 /* Child */
1180 execl("/sbin/fsck", "/sbin/fsck", "-aT", node, NULL);
7e0ed2e9 1181 log_open();
cf32c486
LP		 1182 log_debug_errno(errno, "Failed to execl() fsck: %m");
1183 _exit(FSCK_OPERATIONAL_ERROR);
1184 }
1185
1186 exit_status = wait_for_terminate_and_check("fsck", pid, 0);
1187 if (exit_status < 0)
1188 return log_debug_errno(exit_status, "Failed to fork off /sbin/fsck: %m");
1189
1190 if ((exit_status & ~FSCK_ERROR_CORRECTED) != FSCK_SUCCESS) {
1191 log_debug("fsck failed with exit status %i.", exit_status);
1192
1193 if ((exit_status & (FSCK_SYSTEM_SHOULD_REBOOT|FSCK_ERRORS_LEFT_UNCORRECTED)) != 0)
1194 return log_debug_errno(SYNTHETIC_ERRNO(EUCLEAN), "File system is corrupted, refusing.");
1195
1196 log_debug("Ignoring fsck error.");
1197 }
1198
1199 return 0;
1200}
1201
81939d9d
LP		 1202static int fs_grow(const char *node_path, const char *mount_path) {
1203 _cleanup_close_ int mount_fd = -1, node_fd = -1;
81939d9d
LP		 1204 uint64_t size, newsize;
1205 int r;
1206
1207 node_fd = open(node_path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
1208 if (node_fd < 0)
1209 return log_debug_errno(errno, "Failed to open node device %s: %m", node_path);
1210
1211 if (ioctl(node_fd, BLKGETSIZE64, &size) != 0)
1212 return log_debug_errno(errno, "Failed to get block device size of %s: %m", node_path);
1213
1214 mount_fd = open(mount_path, O_RDONLY|O_DIRECTORY|O_CLOEXEC);
1215 if (mount_fd < 0)
1216 return log_debug_errno(errno, "Failed to open mountd file system %s: %m", mount_path);
1217
1218 log_debug("Resizing \"%s\" to %"PRIu64" bytes...", mount_path, size);
1219 r = resize_fs(mount_fd, size, &newsize);
1220 if (r < 0)
1221 return log_debug_errno(r, "Failed to resize \"%s\" to %"PRIu64" bytes: %m", mount_path, size);
1222
1223 if (newsize == size)
1224 log_debug("Successfully resized \"%s\" to %s bytes.",
2b59bf51 1225 mount_path, FORMAT_BYTES(newsize));
81939d9d
LP		 1226 else {
1227 assert(newsize < size);
1228 log_debug("Successfully resized \"%s\" to %s bytes (%"PRIu64" bytes lost due to blocksize).",
2b59bf51 1229 mount_path, FORMAT_BYTES(newsize), size - newsize);
81939d9d
LP		 1230 }
1231
1232 return 0;
1233}
1234
18b5886e
LP		 1235static int mount_partition(
1236 DissectedPartition *m,
1237 const char *where,
1238 const char *directory,
2d3a5a73 1239 uid_t uid_shift,
21b61b1d 1240 uid_t uid_range,
18b5886e
LP		 1241 DissectImageFlags flags) {
1242
2d3a5a73
LP		 1243 _cleanup_free_ char *chased = NULL, *options = NULL;
1244 const char *p, *node, *fstype;
21b61b1d 1245 bool rw, remap_uid_gid = false;
2eedfd2d 1246 int r;
8c1be37e
LP		 1247
1248 assert(m);
1249 assert(where);
1250
4dc28665 1251 /* Use decrypted node and matching fstype if available, otherwise use the original device */
18b5886e 1252 node = m->decrypted_node ?: m->node;
4dc28665 1253 fstype = m->decrypted_node ? m->decrypted_fstype: m->fstype;
18b5886e 1254
4dc28665 1255 if (!m->found || !node)
8c1be37e 1256 return 0;
4dc28665
LP		 1257 if (!fstype)
1258 return -EAFNOSUPPORT;
8c1be37e 1259
68ac5118
ZJS		 1260 /* We are looking at an encrypted partition? This either means stacked encryption, or the caller
1261 * didn't call dissected_image_decrypt() beforehand. Let's return a recognizable error for this
1262 * case. */
4dc28665 1263 if (streq(fstype, "crypto_LUKS"))
fa45d12c 1264 return -EUNATCH;
18b5886e 1265
ef9c184d 1266 rw = m->rw && !(flags & DISSECT_IMAGE_MOUNT_READ_ONLY);
8c1be37e 1267
cf32c486
LP		 1268 if (FLAGS_SET(flags, DISSECT_IMAGE_FSCK) && rw) {
1269 r = run_fsck(node, fstype);
1270 if (r < 0)
1271 return r;
1272 }
1273
2eedfd2d 1274 if (directory) {
334eb5b0
LP		 1275 /* Automatically create missing mount points inside the image, if necessary. */
1276 r = mkdir_p_root(where, directory, uid_shift, (gid_t) uid_shift, 0755);
1277 if (r < 0 && r != -EROFS)
1278 return r;
1f0f82f1 1279
a5648b80 1280 r = chase_symlinks(directory, where, CHASE_PREFIX_ROOT, &chased, NULL);
2eedfd2d
LP		 1281 if (r < 0)
1282 return r;
1283
1284 p = chased;
9842905e
LP		 1285 } else {
1286 /* Create top-level mount if missing – but only if this is asked for. This won't modify the
1287 * image (as the branch above does) but the host hierarchy, and the created directory might
1288 * survive our mount in the host hierarchy hence. */
1289 if (FLAGS_SET(flags, DISSECT_IMAGE_MKDIR)) {
1290 r = mkdir_p(where, 0755);
1291 if (r < 0)
1292 return r;
1293 }
1294
8c1be37e 1295 p = where;
9842905e 1296 }
8c1be37e 1297
18b5886e 1298 /* If requested, turn on discard support. */
154d2269 1299 if (fstype_can_discard(fstype) &&
18b5886e 1300 ((flags & DISSECT_IMAGE_DISCARD) ||
3afda7c7 1301 ((flags & DISSECT_IMAGE_DISCARD_ON_LOOP) && is_loop_device(m->node) > 0))) {
2d3a5a73
LP		 1302 options = strdup("discard");
1303 if (!options)
1304 return -ENOMEM;
1305 }
1306
21b61b1d 1307 if (uid_is_valid(uid_shift) && uid_shift != 0) {
2d3a5a73 1308
21b61b1d
LP		 1309 if (fstype_can_uid_gid(fstype)) {
1310 _cleanup_free_ char *uid_option = NULL;
2d3a5a73 1311
21b61b1d
LP		 1312 if (asprintf(&uid_option, "uid=" UID_FMT ",gid=" GID_FMT, uid_shift, (gid_t) uid_shift) < 0)
1313 return -ENOMEM;
1314
1315 if (!strextend_with_separator(&options, ",", uid_option))
1316 return -ENOMEM;
1317 } else if (FLAGS_SET(flags, DISSECT_IMAGE_MOUNT_IDMAPPED))
1318 remap_uid_gid = true;
2d3a5a73 1319 }
8c1be37e 1320
18d73705 1321 if (!isempty(m->mount_options))
c2bc710b 1322 if (!strextend_with_separator(&options, ",", m->mount_options))
18d73705
LB		 1323 return -ENOMEM;
1324
b620bf33
LP		 1325 /* So, when you request MS_RDONLY from ext4, then this means nothing. It happily still writes to the
1326 * backing storage. What's worse, the BLKRO[GS]ET flag and (in case of loopback devices)
1327 * LO_FLAGS_READ_ONLY don't mean anything, they affect userspace accesses only, and write accesses
1328 * from the upper file system still get propagated through to the underlying file system,
1329 * unrestricted. To actually get ext4/xfs/btrfs to stop writing to the device we need to specify
1330 * "norecovery" as mount option, in addition to MS_RDONLY. Yes, this sucks, since it means we need to
1331 * carry a per file system table here.
1332 *
1333 * Note that this means that we might not be able to mount corrupted file systems as read-only
1334 * anymore (since in some cases the kernel implementations will refuse mounting when corrupted,
1335 * read-only and "norecovery" is specified). But I think for the case of automatically determined
1336 * mount options for loopback devices this is the right choice, since otherwise using the same
1337 * loopback file twice even in read-only mode, is going to fail badly sooner or later. The usecase of
1338 * making reuse of the immutable images "just work" is more relevant to us than having read-only
1339 * access that actually modifies stuff work on such image files. Or to say this differently: if
1340 * people want their file systems to be fixed up they should just open them in writable mode, where
1341 * all these problems don't exist. */
1342 if (!rw && STRPTR_IN_SET(fstype, "ext3", "ext4", "xfs", "btrfs"))
1343 if (!strextend_with_separator(&options, ",", "norecovery"))
1344 return -ENOMEM;
1345
511a8cfe 1346 r = mount_nofollow_verbose(LOG_DEBUG, node, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), options);
d9223c07
LP		 1347 if (r < 0)
1348 return r;
1349
81939d9d
LP		 1350 if (rw && m->growfs && FLAGS_SET(flags, DISSECT_IMAGE_GROWFS))
1351 (void) fs_grow(node, p);
1352
21b61b1d 1353 if (remap_uid_gid) {
2b2777ed 1354 r = remount_idmap(p, uid_shift, uid_range, UID_INVALID, REMOUNT_IDMAPPING_HOST_ROOT);
21b61b1d
LP		 1355 if (r < 0)
1356 return r;
1357 }
1358
d9223c07 1359 return 1;
8c1be37e
LP		 1360}
1361
7cf66030
LP		 1362static int mount_root_tmpfs(const char *where, uid_t uid_shift, DissectImageFlags flags) {
1363 _cleanup_free_ char *options = NULL;
1364 int r;
1365
1366 assert(where);
1367
1368 /* For images that contain /usr/ but no rootfs, let's mount rootfs as tmpfs */
1369
1370 if (FLAGS_SET(flags, DISSECT_IMAGE_MKDIR)) {
1371 r = mkdir_p(where, 0755);
1372 if (r < 0)
1373 return r;
1374 }
1375
1376 if (uid_is_valid(uid_shift)) {
1377 if (asprintf(&options, "uid=" UID_FMT ",gid=" GID_FMT, uid_shift, (gid_t) uid_shift) < 0)
1378 return -ENOMEM;
1379 }
1380
1381 r = mount_nofollow_verbose(LOG_DEBUG, "rootfs", where, "tmpfs", MS_NODEV, options);
1382 if (r < 0)
1383 return r;
1384
1385 return 1;
1386}
1387
21b61b1d
LP		 1388int dissected_image_mount(
1389 DissectedImage *m,
1390 const char *where,
1391 uid_t uid_shift,
1392 uid_t uid_range,
1393 DissectImageFlags flags) {
1394
1f0f82f1 1395 int r, xbootldr_mounted;
8c1be37e
LP		 1396
1397 assert(m);
1398 assert(where);
1399
fa45d12c
LP		 1400 /* Returns:
1401 *
1402 * -ENXIO → No root partition found
7718ac97 1403 * -EMEDIUMTYPE → DISSECT_IMAGE_VALIDATE_OS set but no os-release/extension-release file found
fa45d12c
LP		 1404 * -EUNATCH → Encrypted partition found for which no dm-crypt was set up yet
1405 * -EUCLEAN → fsck for file system failed
1406 * -EBUSY → File system already mounted/used elsewhere (kernel)
4dc28665 1407 * -EAFNOSUPPORT → File system type not supported or not known
fa45d12c
LP		 1408 */
1409
7cf66030
LP		 1410 if (!(m->partitions[PARTITION_ROOT].found ||
1411 (m->partitions[PARTITION_USR].found && FLAGS_SET(flags, DISSECT_IMAGE_USR_NO_ROOT))))
1412 return -ENXIO; /* Require a root fs or at least a /usr/ fs (the latter is subject to a flag of its own) */
8c1be37e 1413
2d3a5a73 1414 if ((flags & DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY) == 0) {
7cf66030
LP		 1415
1416 /* First mount the root fs. If there's none we use a tmpfs. */
1417 if (m->partitions[PARTITION_ROOT].found)
21b61b1d 1418 r = mount_partition(m->partitions + PARTITION_ROOT, where, NULL, uid_shift, uid_range, flags);
7cf66030
LP		 1419 else
1420 r = mount_root_tmpfs(where, uid_shift, flags);
2d3a5a73
LP		 1421 if (r < 0)
1422 return r;
aee36b4e 1423
aee36b4e 1424 /* For us mounting root always means mounting /usr as well */
21b61b1d 1425 r = mount_partition(m->partitions + PARTITION_USR, where, "/usr", uid_shift, uid_range, flags);
aee36b4e
LP		 1426 if (r < 0)
1427 return r;
03bcb6d4 1428
9ccb531a
LB		 1429 if ((flags & (DISSECT_IMAGE_VALIDATE_OS|DISSECT_IMAGE_VALIDATE_OS_EXT)) != 0) {
1430 /* If either one of the validation flags are set, ensure that the image qualifies
1431 * as one or the other (or both). */
1432 bool ok = false;
1433
1434 if (FLAGS_SET(flags, DISSECT_IMAGE_VALIDATE_OS)) {
1435 r = path_is_os_tree(where);
1436 if (r < 0)
1437 return r;
1438 if (r > 0)
1439 ok = true;
1440 }
1441 if (!ok && FLAGS_SET(flags, DISSECT_IMAGE_VALIDATE_OS_EXT)) {
7718ac97
LB		 1442 r = path_is_extension_tree(where, m->image_name);
1443 if (r < 0)
1444 return r;
9ccb531a
LB		 1445 if (r > 0)
1446 ok = true;
7718ac97 1447 }
9ccb531a
LB		 1448
1449 if (!ok)
1450 return -ENOMEDIUM;
03bcb6d4 1451 }
2d3a5a73
LP		 1452 }
1453
705727fd 1454 if (flags & DISSECT_IMAGE_MOUNT_ROOT_ONLY)
2d3a5a73 1455 return 0;
8c1be37e 1456
21b61b1d 1457 r = mount_partition(m->partitions + PARTITION_HOME, where, "/home", uid_shift, uid_range, flags);
8c1be37e
LP		 1458 if (r < 0)
1459 return r;
1460
21b61b1d 1461 r = mount_partition(m->partitions + PARTITION_SRV, where, "/srv", uid_shift, uid_range, flags);
8c1be37e
LP		 1462 if (r < 0)
1463 return r;
1464
21b61b1d 1465 r = mount_partition(m->partitions + PARTITION_VAR, where, "/var", uid_shift, uid_range, flags);
d4dffb85
LP		 1466 if (r < 0)
1467 return r;
1468
21b61b1d 1469 r = mount_partition(m->partitions + PARTITION_TMP, where, "/var/tmp", uid_shift, uid_range, flags);
d4dffb85
LP		 1470 if (r < 0)
1471 return r;
1472
21b61b1d 1473 xbootldr_mounted = mount_partition(m->partitions + PARTITION_XBOOTLDR, where, "/boot", uid_shift, uid_range, flags);
1f0f82f1
LP		 1474 if (xbootldr_mounted < 0)
1475 return xbootldr_mounted;
d9223c07 1476
8c1be37e 1477 if (m->partitions[PARTITION_ESP].found) {
1f0f82f1
LP		 1478 int esp_done = false;
1479
d9223c07
LP		 1480 /* Mount the ESP to /efi if it exists. If it doesn't exist, use /boot instead, but only if it
1481 * exists and is empty, and we didn't already mount the XBOOTLDR partition into it. */
8c1be37e 1482
a5648b80 1483 r = chase_symlinks("/efi", where, CHASE_PREFIX_ROOT, NULL, NULL);
1f0f82f1
LP		 1484 if (r < 0) {
1485 if (r != -ENOENT)
d9223c07 1486 return r;
8c1be37e 1487
1f0f82f1
LP		 1488 /* /efi doesn't exist. Let's see if /boot is suitable then */
1489
1490 if (!xbootldr_mounted) {
1491 _cleanup_free_ char *p = NULL;
2eedfd2d 1492
1f0f82f1
LP		 1493 r = chase_symlinks("/boot", where, CHASE_PREFIX_ROOT, &p, NULL);
1494 if (r < 0) {
1495 if (r != -ENOENT)
1496 return r;
db55bbf2 1497 } else if (dir_is_empty(p, /* ignore_hidden_or_backup= */ false) > 0) {
1f0f82f1 1498 /* It exists and is an empty directory. Let's mount the ESP there. */
21b61b1d 1499 r = mount_partition(m->partitions + PARTITION_ESP, where, "/boot", uid_shift, uid_range, flags);
1f0f82f1
LP		 1500 if (r < 0)
1501 return r;
1502
1503 esp_done = true;
1504 }
2eedfd2d 1505 }
8c1be37e 1506 }
1f0f82f1
LP		 1507
1508 if (!esp_done) {
1509 /* OK, let's mount the ESP now to /efi (possibly creating the dir if missing) */
1510
21b61b1d 1511 r = mount_partition(m->partitions + PARTITION_ESP, where, "/efi", uid_shift, uid_range, flags);
1f0f82f1
LP		 1512 if (r < 0)
1513 return r;
1514 }
8c1be37e
LP		 1515 }
1516
1517 return 0;
1518}
1519
21b61b1d
LP		 1520int dissected_image_mount_and_warn(
1521 DissectedImage *m,
1522 const char *where,
1523 uid_t uid_shift,
1524 uid_t uid_range,
1525 DissectImageFlags flags) {
1526
af187ab2
LP		 1527 int r;
1528
1529 assert(m);
1530 assert(where);
1531
21b61b1d 1532 r = dissected_image_mount(m, where, uid_shift, uid_range, flags);
af187ab2
LP		 1533 if (r == -ENXIO)
1534 return log_error_errno(r, "Not root file system found in image.");
1535 if (r == -EMEDIUMTYPE)
7718ac97 1536 return log_error_errno(r, "No suitable os-release/extension-release file in image found.");
af187ab2
LP		 1537 if (r == -EUNATCH)
1538 return log_error_errno(r, "Encrypted file system discovered, but decryption not requested.");
1539 if (r == -EUCLEAN)
1540 return log_error_errno(r, "File system check on image failed.");
1541 if (r == -EBUSY)
1542 return log_error_errno(r, "File system already mounted elsewhere.");
4dc28665
LP		 1543 if (r == -EAFNOSUPPORT)
1544 return log_error_errno(r, "File system type not supported or not known.");
af187ab2
LP		 1545 if (r < 0)
1546 return log_error_errno(r, "Failed to mount image: %m");
1547
1548 return r;
1549}
1550
349cc4a5 1551#if HAVE_LIBCRYPTSETUP
9321ad51 1552struct DecryptedPartition {
18b5886e
LP		 1553 struct crypt_device *device;
1554 char *name;
1555 bool relinquished;
9321ad51
YW		 1556};
1557#endif
1558
1559typedef struct DecryptedPartition DecryptedPartition;
18b5886e
LP		 1560
1561struct DecryptedImage {
9321ad51 1562 unsigned n_ref;
18b5886e
LP		 1563 DecryptedPartition *decrypted;
1564 size_t n_decrypted;
18b5886e 1565};
18b5886e 1566
9321ad51 1567static DecryptedImage* decrypted_image_free(DecryptedImage *d) {
349cc4a5 1568#if HAVE_LIBCRYPTSETUP
18b5886e
LP		 1569 int r;
1570
1571 if (!d)
1572 return NULL;
1573
67f63ee5 1574 for (size_t i = 0; i < d->n_decrypted; i++) {
18b5886e
LP		 1575 DecryptedPartition *p = d->decrypted + i;
1576
1577 if (p->device && p->name && !p->relinquished) {
ea16d7f4
YW		 1578 /* Let's deactivate lazily, as the dm volume may be already/still used by other processes. */
1579 r = sym_crypt_deactivate_by_name(p->device, p->name, CRYPT_DEACTIVATE_DEFERRED);
18b5886e
LP		 1580 if (r < 0)
1581 log_debug_errno(r, "Failed to deactivate encrypted partition %s", p->name);
1582 }
1583
1584 if (p->device)
0d12936d 1585 sym_crypt_free(p->device);
18b5886e
LP		 1586 free(p->name);
1587 }
1588
f91861e4 1589 free(d->decrypted);
18b5886e
LP		 1590 free(d);
1591#endif
1592 return NULL;
1593}
1594
9321ad51
YW		 1595DEFINE_TRIVIAL_REF_UNREF_FUNC(DecryptedImage, decrypted_image, decrypted_image_free);
1596
349cc4a5 1597#if HAVE_LIBCRYPTSETUP
9321ad51
YW		 1598static int decrypted_image_new(DecryptedImage **ret) {
1599 _cleanup_(decrypted_image_unrefp) DecryptedImage *d = NULL;
1600
1601 assert(ret);
1602
1603 d = new(DecryptedImage, 1);
1604 if (!d)
1605 return -ENOMEM;
1606
1607 *d = (DecryptedImage) {
1608 .n_ref = 1,
1609 };
1610
1611 *ret = TAKE_PTR(d);
1612 return 0;
1613}
4623e8e6
LP		 1614
1615static int make_dm_name_and_node(const void *original_node, const char *suffix, char **ret_name, char **ret_node) {
1616 _cleanup_free_ char *name = NULL, *node = NULL;
1617 const char *base;
1618
1619 assert(original_node);
1620 assert(suffix);
1621 assert(ret_name);
1622 assert(ret_node);
1623
1624 base = strrchr(original_node, '/');
1625 if (!base)
ac1f3ad0
LB		 1626 base = original_node;
1627 else
1628 base++;
4623e8e6
LP		 1629 if (isempty(base))
1630 return -EINVAL;
1631
1632 name = strjoin(base, suffix);
1633 if (!name)
1634 return -ENOMEM;
1635 if (!filename_is_valid(name))
1636 return -EINVAL;
1637
0d12936d 1638 node = path_join(sym_crypt_get_dir(), name);
4623e8e6
LP		 1639 if (!node)
1640 return -ENOMEM;
1641
1cc6c93a
YW		 1642 *ret_name = TAKE_PTR(name);
1643 *ret_node = TAKE_PTR(node);
4623e8e6 1644
4623e8e6
LP		 1645 return 0;
1646}
1647
18b5886e
LP		 1648static int decrypt_partition(
1649 DissectedPartition *m,
1650 const char *passphrase,
1651 DissectImageFlags flags,
1652 DecryptedImage *d) {
1653
1654 _cleanup_free_ char *node = NULL, *name = NULL;
0d12936d 1655 _cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL;
18b5886e
LP		 1656 int r;
1657
1658 assert(m);
1659 assert(d);
1660
1661 if (!m->found || !m->node || !m->fstype)
1662 return 0;
1663
1664 if (!streq(m->fstype, "crypto_LUKS"))
1665 return 0;
1666
bdd73ac5
ZJS		 1667 if (!passphrase)
1668 return -ENOKEY;
1669
0d12936d
LP		 1670 r = dlopen_cryptsetup();
1671 if (r < 0)
1672 return r;
1673
4623e8e6
LP		 1674 r = make_dm_name_and_node(m->node, "-decrypted", &name, &node);
1675 if (r < 0)
1676 return r;
18b5886e 1677
319a4f4b 1678 if (!GREEDY_REALLOC0(d->decrypted, d->n_decrypted + 1))
18b5886e
LP		 1679 return -ENOMEM;
1680
0d12936d 1681 r = sym_crypt_init(&cd, m->node);
18b5886e 1682 if (r < 0)
715cbb81 1683 return log_debug_errno(r, "Failed to initialize dm-crypt: %m");
18b5886e 1684
efc3b12f 1685 cryptsetup_enable_logging(cd);
1887032f 1686
0d12936d 1687 r = sym_crypt_load(cd, CRYPT_LUKS, NULL);
294bd454
ZJS		 1688 if (r < 0)
1689 return log_debug_errno(r, "Failed to load LUKS metadata: %m");
18b5886e 1690
0d12936d 1691 r = sym_crypt_activate_by_passphrase(cd, name, CRYPT_ANY_SLOT, passphrase, strlen(passphrase),
ef9c184d 1692 ((flags & DISSECT_IMAGE_DEVICE_READ_ONLY) ? CRYPT_ACTIVATE_READONLY : 0) |
0d12936d 1693 ((flags & DISSECT_IMAGE_DISCARD_ON_CRYPTO) ? CRYPT_ACTIVATE_ALLOW_DISCARDS : 0));
294bd454 1694 if (r < 0) {
715cbb81 1695 log_debug_errno(r, "Failed to activate LUKS device: %m");
294bd454 1696 return r == -EPERM ? -EKEYREJECTED : r;
18b5886e 1697 }
18b5886e 1698
94344385
LP		 1699 d->decrypted[d->n_decrypted++] = (DecryptedPartition) {
1700 .name = TAKE_PTR(name),
1701 .device = TAKE_PTR(cd),
1702 };
18b5886e 1703
1cc6c93a 1704 m->decrypted_node = TAKE_PTR(node);
18b5886e
LP		 1705
1706 return 0;
4623e8e6
LP		 1707}
1708
89e62e0b
LP		 1709static int verity_can_reuse(
1710 const VeritySettings *verity,
1711 const char *name,
1712 struct crypt_device **ret_cd) {
1713
ac1f3ad0
LB		 1714 /* If the same volume was already open, check that the root hashes match, and reuse it if they do */
1715 _cleanup_free_ char *root_hash_existing = NULL;
0d12936d 1716 _cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL;
ac1f3ad0 1717 struct crypt_params_verity crypt_params = {};
89e62e0b 1718 size_t root_hash_existing_size;
ac1f3ad0
LB		 1719 int r;
1720
89e62e0b
LP		 1721 assert(verity);
1722 assert(name);
ac1f3ad0
LB		 1723 assert(ret_cd);
1724
0d12936d 1725 r = sym_crypt_init_by_name(&cd, name);
ac1f3ad0
LB		 1726 if (r < 0)
1727 return log_debug_errno(r, "Error opening verity device, crypt_init_by_name failed: %m");
0d12936d 1728
c719805e
LP		 1729 cryptsetup_enable_logging(cd);
1730
0d12936d 1731 r = sym_crypt_get_verity_info(cd, &crypt_params);
ac1f3ad0
LB		 1732 if (r < 0)
1733 return log_debug_errno(r, "Error opening verity device, crypt_get_verity_info failed: %m");
0d12936d 1734
89e62e0b
LP		 1735 root_hash_existing_size = verity->root_hash_size;
1736 root_hash_existing = malloc0(root_hash_existing_size);
ac1f3ad0
LB		 1737 if (!root_hash_existing)
1738 return -ENOMEM;
0d12936d
LP		 1739
1740 r = sym_crypt_volume_key_get(cd, CRYPT_ANY_SLOT, root_hash_existing, &root_hash_existing_size, NULL, 0);
ac1f3ad0
LB		 1741 if (r < 0)
1742 return log_debug_errno(r, "Error opening verity device, crypt_volume_key_get failed: %m");
89e62e0b
LP		 1743 if (verity->root_hash_size != root_hash_existing_size ||
1744 memcmp(root_hash_existing, verity->root_hash, verity->root_hash_size) != 0)
ac1f3ad0 1745 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Error opening verity device, it already exists but root hashes are different.");
89e62e0b 1746
ac1f3ad0 1747#if HAVE_CRYPT_ACTIVATE_BY_SIGNED_KEY
89e62e0b
LP		 1748 /* Ensure that, if signatures are supported, we only reuse the device if the previous mount used the
1749 * same settings, so that a previous unsigned mount will not be reused if the user asks to use
28423d9a 1750 * signing for the new one, and vice versa. */
89e62e0b 1751 if (!!verity->root_hash_sig != !!(crypt_params.flags & CRYPT_VERITY_ROOT_HASH_SIGNATURE))
ac1f3ad0
LB		 1752 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Error opening verity device, it already exists but signature settings are not the same.");
1753#endif
1754
1755 *ret_cd = TAKE_PTR(cd);
1756 return 0;
1757}
1758
75db809a 1759static inline char* dm_deferred_remove_clean(char *name) {
ac1f3ad0 1760 if (!name)
75db809a 1761 return NULL;
0d12936d
LP		 1762
1763 (void) sym_crypt_deactivate_by_name(NULL, name, CRYPT_DEACTIVATE_DEFERRED);
75db809a 1764 return mfree(name);
ac1f3ad0
LB		 1765}
1766DEFINE_TRIVIAL_CLEANUP_FUNC(char *, dm_deferred_remove_clean);
1767
c2fa92e7
LP		 1768static int validate_signature_userspace(const VeritySettings *verity) {
1769#if HAVE_OPENSSL
1770 _cleanup_(sk_X509_free_allp) STACK_OF(X509) *sk = NULL;
1771 _cleanup_strv_free_ char **certs = NULL;
1772 _cleanup_(PKCS7_freep) PKCS7 *p7 = NULL;
1773 _cleanup_free_ char *s = NULL;
1774 _cleanup_(BIO_freep) BIO *bio = NULL; /* 'bio' must be freed first, 's' second, hence keep this order
1775 * of declaration in place, please */
1776 const unsigned char *d;
c2fa92e7
LP		 1777 int r;
1778
1779 assert(verity);
1780 assert(verity->root_hash);
1781 assert(verity->root_hash_sig);
1782
1783 /* Because installing a signature certificate into the kernel chain is so messy, let's optionally do
1784 * userspace validation. */
1785
1786 r = conf_files_list_nulstr(&certs, ".crt", NULL, CONF_FILES_REGULAR|CONF_FILES_FILTER_MASKED, CONF_PATHS_NULSTR("verity.d"));
1787 if (r < 0)
1788 return log_debug_errno(r, "Failed to enumerate certificates: %m");
1789 if (strv_isempty(certs)) {
1790 log_debug("No userspace dm-verity certificates found.");
1791 return 0;
1792 }
1793
1794 d = verity->root_hash_sig;
1795 p7 = d2i_PKCS7(NULL, &d, (long) verity->root_hash_sig_size);
1796 if (!p7)
1797 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to parse PKCS7 DER signature data.");
1798
1799 s = hexmem(verity->root_hash, verity->root_hash_size);
1800 if (!s)
1801 return log_oom_debug();
1802
1803 bio = BIO_new_mem_buf(s, strlen(s));
1804 if (!bio)
1805 return log_oom_debug();
1806
1807 sk = sk_X509_new_null();
1808 if (!sk)
1809 return log_oom_debug();
1810
1811 STRV_FOREACH(i, certs) {
1812 _cleanup_(X509_freep) X509 *c = NULL;
1813 _cleanup_fclose_ FILE *f = NULL;
1814
1815 f = fopen(*i, "re");
1816 if (!f) {
1817 log_debug_errno(errno, "Failed to open '%s', ignoring: %m", *i);
1818 continue;
1819 }
1820
1821 c = PEM_read_X509(f, NULL, NULL, NULL);
1822 if (!c) {
1823 log_debug("Failed to load X509 certificate '%s', ignoring.", *i);
1824 continue;
1825 }
1826
1827 if (sk_X509_push(sk, c) == 0)
1828 return log_oom_debug();
1829
1830 TAKE_PTR(c);
1831 }
1832
1833 r = PKCS7_verify(p7, sk, NULL, bio, NULL, PKCS7_NOINTERN|PKCS7_NOVERIFY);
1834 if (r)
1835 log_debug("Userspace PKCS#7 validation succeeded.");
1836 else
1837 log_debug("Userspace PKCS#7 validation failed: %s", ERR_error_string(ERR_get_error(), NULL));
1838
1839 return r;
1840#else
1841 log_debug("Not doing client-side validation of dm-verity root hash signatures, OpenSSL support disabled.");
1842 return 0;
1843#endif
1844}
1845
1846static int do_crypt_activate_verity(
1847 struct crypt_device *cd,
1848 const char *name,
1849 const VeritySettings *verity) {
1850
1851 bool check_signature;
1852 int r;
1853
1854 assert(cd);
1855 assert(name);
1856 assert(verity);
1857
1858 if (verity->root_hash_sig) {
1859 r = getenv_bool_secure("SYSTEMD_DISSECT_VERITY_SIGNATURE");
1860 if (r < 0 && r != -ENXIO)
1861 log_debug_errno(r, "Failed to parse $SYSTEMD_DISSECT_VERITY_SIGNATURE");
1862
1863 check_signature = r != 0;
1864 } else
1865 check_signature = false;
1866
1867 if (check_signature) {
1868
1869#if HAVE_CRYPT_ACTIVATE_BY_SIGNED_KEY
1870 /* First, if we have support for signed keys in the kernel, then try that first. */
1871 r = sym_crypt_activate_by_signed_key(
1872 cd,
1873 name,
1874 verity->root_hash,
1875 verity->root_hash_size,
1876 verity->root_hash_sig,
1877 verity->root_hash_sig_size,
1878 CRYPT_ACTIVATE_READONLY);
1879 if (r >= 0)
1880 return r;
1881
1882 log_debug("Validation of dm-verity signature failed via the kernel, trying userspace validation instead.");
1883#else
1884 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.",
1885 program_invocation_short_name);
1886#endif
1887
1888 /* So this didn't work via the kernel, then let's try userspace validation instead. If that
1889 * works we'll try to activate without telling the kernel the signature. */
1890
1891 r = validate_signature_userspace(verity);
1892 if (r < 0)
1893 return r;
1894 if (r == 0)
1895 return log_debug_errno(SYNTHETIC_ERRNO(ENOKEY),
1896 "Activation of signed Verity volume worked neither via the kernel nor in userspace, can't activate.");
1897 }
1898
1899 return sym_crypt_activate_by_volume_key(
1900 cd,
1901 name,
1902 verity->root_hash,
1903 verity->root_hash_size,
1904 CRYPT_ACTIVATE_READONLY);
1905}
1906
ad361a50
YW		 1907static usec_t verity_timeout(void) {
1908 usec_t t = 100 * USEC_PER_MSEC;
1909 const char *e;
1910 int r;
1911
1912 /* On slower machines, like non-KVM vm, setting up device may take a long time.
1913 * Let's make the timeout configurable. */
1914
1915 e = getenv("SYSTEMD_DISSECT_VERITY_TIMEOUT_SEC");
1916 if (!e)
1917 return t;
1918
1919 r = parse_sec(e, &t);
1920 if (r < 0)
1921 log_debug_errno(r,
1922 "Failed to parse timeout specified in $SYSTEMD_DISSECT_VERITY_TIMEOUT_SEC, "
1923 "using the default timeout (%s).",
1924 FORMAT_TIMESPAN(t, USEC_PER_MSEC));
1925
1926 return t;
1927}
1928
4623e8e6 1929static int verity_partition(
aee36b4e 1930 PartitionDesignator designator,
4623e8e6
LP		 1931 DissectedPartition *m,
1932 DissectedPartition *v,
89e62e0b 1933 const VeritySettings *verity,
4623e8e6
LP		 1934 DissectImageFlags flags,
1935 DecryptedImage *d) {
1936
0d12936d 1937 _cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL;
ac1f3ad0 1938 _cleanup_(dm_deferred_remove_cleanp) char *restore_deferred_remove = NULL;
89e62e0b 1939 _cleanup_free_ char *node = NULL, *name = NULL;
4623e8e6
LP		 1940 int r;
1941
1942 assert(m);
89e62e0b 1943 assert(v || (verity && verity->data_path));
4623e8e6 1944
89e62e0b 1945 if (!verity || !verity->root_hash)
4623e8e6 1946 return 0;
aee36b4e
LP		 1947 if (!((verity->designator < 0 && designator == PARTITION_ROOT) ||
1948 (verity->designator == designator)))
1949 return 0;
4623e8e6
LP		 1950
1951 if (!m->found || !m->node || !m->fstype)
1952 return 0;
89e62e0b 1953 if (!verity->data_path) {
e7cbe5cb
LB		 1954 if (!v->found || !v->node || !v->fstype)
1955 return 0;
4623e8e6 1956
e7cbe5cb
LB		 1957 if (!streq(v->fstype, "DM_verity_hash"))
1958 return 0;
1959 }
4623e8e6 1960
0d12936d
LP		 1961 r = dlopen_cryptsetup();
1962 if (r < 0)
1963 return r;
1964
ac1f3ad0
LB		 1965 if (FLAGS_SET(flags, DISSECT_IMAGE_VERITY_SHARE)) {
1966 /* Use the roothash, which is unique per volume, as the device node name, so that it can be reused */
1967 _cleanup_free_ char *root_hash_encoded = NULL;
0d12936d 1968
89e62e0b 1969 root_hash_encoded = hexmem(verity->root_hash, verity->root_hash_size);
ac1f3ad0
LB		 1970 if (!root_hash_encoded)
1971 return -ENOMEM;
aee36b4e 1972
ac1f3ad0
LB		 1973 r = make_dm_name_and_node(root_hash_encoded, "-verity", &name, &node);
1974 } else
1975 r = make_dm_name_and_node(m->node, "-verity", &name, &node);
4623e8e6
LP		 1976 if (r < 0)
1977 return r;
1978
89e62e0b 1979 r = sym_crypt_init(&cd, verity->data_path ?: v->node);
4623e8e6
LP		 1980 if (r < 0)
1981 return r;
1982
efc3b12f 1983 cryptsetup_enable_logging(cd);
1887032f 1984
0d12936d 1985 r = sym_crypt_load(cd, CRYPT_VERITY, NULL);
4623e8e6 1986 if (r < 0)
294bd454 1987 return r;
4623e8e6 1988
0d12936d 1989 r = sym_crypt_set_data_device(cd, m->node);
4623e8e6 1990 if (r < 0)
294bd454 1991 return r;
4623e8e6 1992
319a4f4b 1993 if (!GREEDY_REALLOC0(d->decrypted, d->n_decrypted + 1))
ac1f3ad0
LB		 1994 return -ENOMEM;
1995
1996 /* If activating fails because the device already exists, check the metadata and reuse it if it matches.
1997 * In case of ENODEV/ENOENT, which can happen if another process is activating at the exact same time,
1998 * retry a few times before giving up. */
1999 for (unsigned i = 0; i < N_DEVICE_NODE_LIST_ATTEMPTS; i++) {
c2fa92e7
LP		 2000
2001 r = do_crypt_activate_verity(cd, name, verity);
ac1f3ad0
LB		 2002 /* libdevmapper can return EINVAL when the device is already in the activation stage.
2003 * There's no way to distinguish this situation from a genuine error due to invalid
2aed63f4 2004 * parameters, so immediately fall back to activating the device with a unique name.
89e62e0b
LP		 2005 * Improvements in libcrypsetup can ensure this never happens:
2006 * https://gitlab.com/cryptsetup/cryptsetup/-/merge_requests/96 */
ac1f3ad0 2007 if (r == -EINVAL && FLAGS_SET(flags, DISSECT_IMAGE_VERITY_SHARE))
aee36b4e 2008 return verity_partition(designator, m, v, verity, flags & ~DISSECT_IMAGE_VERITY_SHARE, d);
5bf5013f
YW		 2009 if (r < 0 && !IN_SET(r,
2010 -EEXIST, /* Volume is already open and ready to be used */
2011 -EBUSY, /* Volume is being opened but not ready, crypt_init_by_name can fetch details */
2012 -ENODEV /* Volume is being opened but not ready, crypt_init_by_name would fail, try to open again */))
ac1f3ad0 2013 return r;
9ecb5c10 2014 if (IN_SET(r, -EEXIST, -EBUSY)) {
041e2eda 2015 _cleanup_(sym_crypt_freep) struct crypt_device *existing_cd = NULL;
c2923fdc 2016
ac1f3ad0
LB		 2017 if (!restore_deferred_remove){
2018 /* To avoid races, disable automatic removal on umount while setting up the new device. Restore it on failure. */
2019 r = dm_deferred_remove_cancel(name);
9ecb5c10
LB		 2020 /* If activation returns EBUSY there might be no deferred removal to cancel, that's fine */
2021 if (r < 0 && r != -ENXIO)
ac1f3ad0 2022 return log_debug_errno(r, "Disabling automated deferred removal for verity device %s failed: %m", node);
5bf5013f 2023 if (r >= 0) {
9ecb5c10
LB		 2024 restore_deferred_remove = strdup(name);
2025 if (!restore_deferred_remove)
2026 return -ENOMEM;
2027 }
ac1f3ad0 2028 }
c2923fdc 2029
89e62e0b 2030 r = verity_can_reuse(verity, name, &existing_cd);
ac1f3ad0
LB		 2031 /* Same as above, -EINVAL can randomly happen when it actually means -EEXIST */
2032 if (r == -EINVAL && FLAGS_SET(flags, DISSECT_IMAGE_VERITY_SHARE))
aee36b4e 2033 return verity_partition(designator, m, v, verity, flags & ~DISSECT_IMAGE_VERITY_SHARE, d);
5bf5013f 2034 if (r < 0 && !IN_SET(r, -ENODEV, -ENOENT, -EBUSY))
ac1f3ad0 2035 return log_debug_errno(r, "Checking whether existing verity device %s can be reused failed: %m", node);
5bf5013f 2036 if (r >= 0) {
c419b6f0
LB		 2037 /* devmapper might say that the device exists, but the devlink might not yet have been
2038 * created. Check and wait for the udev event in that case. */
ad361a50 2039 r = device_wait_for_devlink(node, "block", verity_timeout(), NULL);
c419b6f0
LB		 2040 /* Fallback to activation with a unique device if it's taking too long */
2041 if (r == -ETIMEDOUT)
2042 break;
2043 if (r < 0)
2044 return r;
2045
cf610e1d 2046 crypt_free_and_replace(cd, existing_cd);
ac1f3ad0 2047 }
c2923fdc 2048 }
5bf5013f 2049 if (r >= 0)
9972e6d6 2050 goto success;
ecab4c47
LB		 2051
2052 /* Device is being opened by another process, but it has not finished yet, yield for 2ms */
2053 (void) usleep(2 * USEC_PER_MSEC);
ac1f3ad0
LB		 2054 }
2055
9972e6d6
YW		 2056 /* All trials failed. Let's try to activate with a unique name. */
2057 if (FLAGS_SET(flags, DISSECT_IMAGE_VERITY_SHARE))
aee36b4e 2058 return verity_partition(designator, m, v, verity, flags & ~DISSECT_IMAGE_VERITY_SHARE, d);
ac1f3ad0 2059
9972e6d6
YW		 2060 return log_debug_errno(SYNTHETIC_ERRNO(EBUSY), "All attempts to activate verity device %s failed.", name);
2061
2062success:
ac1f3ad0
LB		 2063 /* Everything looks good and we'll be able to mount the device, so deferred remove will be re-enabled at that point. */
2064 restore_deferred_remove = mfree(restore_deferred_remove);
4623e8e6 2065
94344385
LP		 2066 d->decrypted[d->n_decrypted++] = (DecryptedPartition) {
2067 .name = TAKE_PTR(name),
2068 .device = TAKE_PTR(cd),
2069 };
4623e8e6 2070
1cc6c93a 2071 m->decrypted_node = TAKE_PTR(node);
4623e8e6
LP		 2072
2073 return 0;
18b5886e
LP		 2074}
2075#endif
2076
2077int dissected_image_decrypt(
2078 DissectedImage *m,
2079 const char *passphrase,
89e62e0b 2080 const VeritySettings *verity,
18b5886e
LP		 2081 DissectImageFlags flags,
2082 DecryptedImage **ret) {
2083
349cc4a5 2084#if HAVE_LIBCRYPTSETUP
49b5b3b4 2085 _cleanup_(decrypted_image_unrefp) DecryptedImage *d = NULL;
18b5886e
LP		 2086 int r;
2087#endif
2088
2089 assert(m);
89e62e0b 2090 assert(!verity || verity->root_hash || verity->root_hash_size == 0);
18b5886e
LP		 2091
2092 /* Returns:
2093 *
2094 * = 0 → There was nothing to decrypt
2095 * > 0 → Decrypted successfully
d1c536f5 2096 * -ENOKEY → There's something to decrypt but no key was supplied
18b5886e
LP		 2097 * -EKEYREJECTED → Passed key was not correct
2098 */
2099
89e62e0b 2100 if (verity && verity->root_hash && verity->root_hash_size < sizeof(sd_id128_t))
4623e8e6
LP		 2101 return -EINVAL;
2102
c3c88d67 2103 if (!m->encrypted && !m->verity_ready) {
ac1e1b5f
YW		 2104 if (ret)
2105 *ret = NULL;
18b5886e
LP		 2106 return 0;
2107 }
2108
349cc4a5 2109#if HAVE_LIBCRYPTSETUP
9321ad51
YW		 2110 r = decrypted_image_new(&d);
2111 if (r < 0)
2112 return r;
18b5886e 2113
569a0e42 2114 for (PartitionDesignator i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
18b5886e 2115 DissectedPartition *p = m->partitions + i;
22043172 2116 PartitionDesignator k;
18b5886e
LP		 2117
2118 if (!p->found)
2119 continue;
2120
2121 r = decrypt_partition(p, passphrase, flags, d);
2122 if (r < 0)
2123 return r;
2124
4623e8e6
LP		 2125 k = PARTITION_VERITY_OF(i);
2126 if (k >= 0) {
aee36b4e 2127 r = verity_partition(i, p, m->partitions + k, verity, flags | DISSECT_IMAGE_VERITY_SHARE, d);
4623e8e6
LP		 2128 if (r < 0)
2129 return r;
2130 }
2131
18b5886e
LP		 2132 if (!p->decrypted_fstype && p->decrypted_node) {
2133 r = probe_filesystem(p->decrypted_node, &p->decrypted_fstype);
7cc84b2c 2134 if (r < 0 && r != -EUCLEAN)
18b5886e
LP		 2135 return r;
2136 }
2137 }
2138
ac1e1b5f
YW		 2139 m->decrypted_image = TAKE_PTR(d);
2140 if (ret)
2141 *ret = decrypted_image_ref(m->decrypted_image);
18b5886e
LP		 2142
2143 return 1;
2144#else
2145 return -EOPNOTSUPP;
2146#endif
2147}
2148
2149int dissected_image_decrypt_interactively(
2150 DissectedImage *m,
2151 const char *passphrase,
89e62e0b 2152 const VeritySettings *verity,
18b5886e
LP		 2153 DissectImageFlags flags,
2154 DecryptedImage **ret) {
2155
2156 _cleanup_strv_free_erase_ char **z = NULL;
2157 int n = 3, r;
2158
2159 if (passphrase)
2160 n--;
2161
2162 for (;;) {
89e62e0b 2163 r = dissected_image_decrypt(m, passphrase, verity, flags, ret);
18b5886e
LP		 2164 if (r >= 0)
2165 return r;
2166 if (r == -EKEYREJECTED)
2167 log_error_errno(r, "Incorrect passphrase, try again!");
fc95c359
YW		 2168 else if (r != -ENOKEY)
2169 return log_error_errno(r, "Failed to decrypt image: %m");
18b5886e 2170
baaa35ad
ZJS		 2171 if (--n < 0)
2172 return log_error_errno(SYNTHETIC_ERRNO(EKEYREJECTED),
2173 "Too many retries.");
18b5886e
LP		 2174
2175 z = strv_free(z);
2176
8806bb4b 2177 r = ask_password_auto("Please enter image passphrase:", NULL, "dissect", "dissect", "dissect.passphrase", USEC_INFINITY, 0, &z);
18b5886e
LP		 2178 if (r < 0)
2179 return log_error_errno(r, "Failed to query for passphrase: %m");
2180
2181 passphrase = z[0];
2182 }
2183}
2184
18b5886e 2185int decrypted_image_relinquish(DecryptedImage *d) {
18b5886e
LP		 2186 assert(d);
2187
67f63ee5
ZJS		 2188 /* Turns on automatic removal after the last use ended for all DM devices of this image, and sets a
2189 * boolean so that we don't clean it up ourselves either anymore */
18b5886e 2190
349cc4a5 2191#if HAVE_LIBCRYPTSETUP
67f63ee5
ZJS		 2192 int r;
2193
2194 for (size_t i = 0; i < d->n_decrypted; i++) {
18b5886e
LP		 2195 DecryptedPartition *p = d->decrypted + i;
2196
2197 if (p->relinquished)
2198 continue;
2199
0d12936d 2200 r = sym_crypt_deactivate_by_name(NULL, p->name, CRYPT_DEACTIVATE_DEFERRED);
18b5886e
LP		 2201 if (r < 0)
2202 return log_debug_errno(r, "Failed to mark %s for auto-removal: %m", p->name);
2203
2204 p->relinquished = true;
2205 }
2206#endif
2207
2208 return 0;
2209}
2210
89e62e0b
LP		 2211static char *build_auxiliary_path(const char *image, const char *suffix) {
2212 const char *e;
2213 char *n;
2214
2215 assert(image);
2216 assert(suffix);
2217
2218 e = endswith(image, ".raw");
2219 if (!e)
2220 return strjoin(e, suffix);
2221
2222 n = new(char, e - image + strlen(suffix) + 1);
2223 if (!n)
2224 return NULL;
2225
2226 strcpy(mempcpy(n, image, e - image), suffix);
2227 return n;
2228}
2229
2230void verity_settings_done(VeritySettings *v) {
2231 assert(v);
2232
2233 v->root_hash = mfree(v->root_hash);
2234 v->root_hash_size = 0;
2235
2236 v->root_hash_sig = mfree(v->root_hash_sig);
2237 v->root_hash_sig_size = 0;
2238
2239 v->data_path = mfree(v->data_path);
2240}
2241
2242int verity_settings_load(
2243 VeritySettings *verity,
f5ea63a5
LP		 2244 const char *image,
2245 const char *root_hash_path,
89e62e0b
LP		 2246 const char *root_hash_sig_path) {
2247
2248 _cleanup_free_ void *root_hash = NULL, *root_hash_sig = NULL;
2249 size_t root_hash_size = 0, root_hash_sig_size = 0;
2250 _cleanup_free_ char *verity_data_path = NULL;
aee36b4e 2251 PartitionDesignator designator;
78ebe980
LP		 2252 int r;
2253
89e62e0b 2254 assert(verity);
78ebe980 2255 assert(image);
aee36b4e 2256 assert(verity->designator < 0 || IN_SET(verity->designator, PARTITION_ROOT, PARTITION_USR));
78ebe980 2257
89e62e0b
LP		 2258 /* If we are asked to load the root hash for a device node, exit early */
2259 if (is_device_path(image))
78ebe980 2260 return 0;
78ebe980 2261
d5fcc5b0
LP		 2262 r = getenv_bool_secure("SYSTEMD_DISSECT_VERITY_SIDECAR");
2263 if (r < 0 && r != -ENXIO)
2264 log_debug_errno(r, "Failed to parse $SYSTEMD_DISSECT_VERITY_SIDECAR, ignoring: %m");
2265 if (r == 0)
2266 return 0;
2267
aee36b4e
LP		 2268 designator = verity->designator;
2269
89e62e0b 2270 /* We only fill in what isn't already filled in */
c2923fdc 2271
89e62e0b 2272 if (!verity->root_hash) {
e7cbe5cb 2273 _cleanup_free_ char *text = NULL;
e7cbe5cb 2274
0389f4fa 2275 if (root_hash_path) {
aee36b4e 2276 /* If explicitly specified it takes precedence */
0389f4fa
LB		 2277 r = read_one_line_file(root_hash_path, &text);
2278 if (r < 0)
e7cbe5cb 2279 return r;
aee36b4e
LP		 2280
2281 if (designator < 0)
2282 designator = PARTITION_ROOT;
0389f4fa 2283 } else {
aee36b4e
LP		 2284 /* Otherwise look for xattr and separate file, and first for the data for root and if
2285 * that doesn't exist for /usr */
0389f4fa 2286
aee36b4e 2287 if (designator < 0 || designator == PARTITION_ROOT) {
c53e07e2 2288 r = getxattr_malloc(image, "user.verity.roothash", &text);
aee36b4e
LP		 2289 if (r < 0) {
2290 _cleanup_free_ char *p = NULL;
78ebe980 2291
aee36b4e
LP		 2292 if (!IN_SET(r, -ENODATA, -ENOENT) && !ERRNO_IS_NOT_SUPPORTED(r))
2293 return r;
e7cbe5cb 2294
aee36b4e
LP		 2295 p = build_auxiliary_path(image, ".roothash");
2296 if (!p)
2297 return -ENOMEM;
2298
2299 r = read_one_line_file(p, &text);
2300 if (r < 0 && r != -ENOENT)
2301 return r;
2302 }
2303
2304 if (text)
2305 designator = PARTITION_ROOT;
2306 }
2307
2308 if (!text && (designator < 0 || designator == PARTITION_USR)) {
2309 /* So in the "roothash" xattr/file name above the "root" of course primarily
2310 * refers to the root of the Verity Merkle tree. But coincidentally it also
2311 * is the hash for the *root* file system, i.e. the "root" neatly refers to
2312 * two distinct concepts called "root". Taking benefit of this happy
2313 * coincidence we call the file with the root hash for the /usr/ file system
2314 * `usrhash`, because `usrroothash` or `rootusrhash` would just be too
2315 * confusing. We thus drop the reference to the root of the Merkle tree, and
2316 * just indicate which file system it's about. */
c53e07e2 2317 r = getxattr_malloc(image, "user.verity.usrhash", &text);
aee36b4e
LP		 2318 if (r < 0) {
2319 _cleanup_free_ char *p = NULL;
2320
2321 if (!IN_SET(r, -ENODATA, -ENOENT) && !ERRNO_IS_NOT_SUPPORTED(r))
2322 return r;
2323
2324 p = build_auxiliary_path(image, ".usrhash");
2325 if (!p)
2326 return -ENOMEM;
2327
2328 r = read_one_line_file(p, &text);
2329 if (r < 0 && r != -ENOENT)
2330 return r;
2331 }
2332
2333 if (text)
2334 designator = PARTITION_USR;
0389f4fa 2335 }
e7cbe5cb
LB		 2336 }
2337
2338 if (text) {
89e62e0b 2339 r = unhexmem(text, strlen(text), &root_hash, &root_hash_size);
e7cbe5cb
LB		 2340 if (r < 0)
2341 return r;
89e62e0b 2342 if (root_hash_size < sizeof(sd_id128_t))
e7cbe5cb
LB		 2343 return -EINVAL;
2344 }
2345 }
2346
90f98986 2347 if ((root_hash || verity->root_hash) && !verity->root_hash_sig) {
aee36b4e 2348 if (root_hash_sig_path) {
ae9cf30b 2349 r = read_full_file(root_hash_sig_path, (char**) &root_hash_sig, &root_hash_sig_size);
aee36b4e
LP		 2350 if (r < 0 && r != -ENOENT)
2351 return r;
2352
2353 if (designator < 0)
2354 designator = PARTITION_ROOT;
2355 } else {
2356 if (designator < 0 || designator == PARTITION_ROOT) {
2357 _cleanup_free_ char *p = NULL;
2358
2359 /* Follow naming convention recommended by the relevant RFC:
2360 * https://tools.ietf.org/html/rfc5751#section-3.2.1 */
2361 p = build_auxiliary_path(image, ".roothash.p7s");
2362 if (!p)
2363 return -ENOMEM;
89e62e0b 2364
ae9cf30b 2365 r = read_full_file(p, (char**) &root_hash_sig, &root_hash_sig_size);
aee36b4e
LP		 2366 if (r < 0 && r != -ENOENT)
2367 return r;
2368 if (r >= 0)
2369 designator = PARTITION_ROOT;
2370 }
2371
2372 if (!root_hash_sig && (designator < 0 || designator == PARTITION_USR)) {
2373 _cleanup_free_ char *p = NULL;
2374
2375 p = build_auxiliary_path(image, ".usrhash.p7s");
2376 if (!p)
2377 return -ENOMEM;
89e62e0b 2378
ae9cf30b 2379 r = read_full_file(p, (char**) &root_hash_sig, &root_hash_sig_size);
aee36b4e
LP		 2380 if (r < 0 && r != -ENOENT)
2381 return r;
2382 if (r >= 0)
2383 designator = PARTITION_USR;
2384 }
89e62e0b
LP		 2385 }
2386
aee36b4e 2387 if (root_hash_sig && root_hash_sig_size == 0) /* refuse empty size signatures */
89e62e0b
LP		 2388 return -EINVAL;
2389 }
2390
2391 if (!verity->data_path) {
2392 _cleanup_free_ char *p = NULL;
2393
2394 p = build_auxiliary_path(image, ".verity");
2395 if (!p)
2396 return -ENOMEM;
2397
2398 if (access(p, F_OK) < 0) {
2399 if (errno != ENOENT)
2400 return -errno;
2401 } else
2402 verity_data_path = TAKE_PTR(p);
2403 }
2404
2405 if (root_hash) {
2406 verity->root_hash = TAKE_PTR(root_hash);
2407 verity->root_hash_size = root_hash_size;
2408 }
2409
2410 if (root_hash_sig) {
2411 verity->root_hash_sig = TAKE_PTR(root_hash_sig);
2412 verity->root_hash_sig_size = root_hash_sig_size;
e7cbe5cb 2413 }
89e62e0b
LP		 2414
2415 if (verity_data_path)
2416 verity->data_path = TAKE_PTR(verity_data_path);
78ebe980 2417
aee36b4e
LP		 2418 if (verity->designator < 0)
2419 verity->designator = designator;
2420
78ebe980
LP		 2421 return 1;
2422}
2423
88b3300f
LP		 2424int dissected_image_load_verity_sig_partition(
2425 DissectedImage *m,
2426 int fd,
2427 VeritySettings *verity) {
2428
2429 _cleanup_free_ void *root_hash = NULL, *root_hash_sig = NULL;
2430 _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
2431 size_t root_hash_size, root_hash_sig_size;
2432 _cleanup_free_ char *buf = NULL;
2433 PartitionDesignator d;
2434 DissectedPartition *p;
2435 JsonVariant *rh, *sig;
2436 ssize_t n;
2437 char *e;
2438 int r;
2439
2440 assert(m);
2441 assert(fd >= 0);
2442 assert(verity);
2443
2444 if (verity->root_hash && verity->root_hash_sig) /* Already loaded? */
2445 return 0;
2446
2447 r = getenv_bool_secure("SYSTEMD_DISSECT_VERITY_EMBEDDED");
2448 if (r < 0 && r != -ENXIO)
2449 log_debug_errno(r, "Failed to parse $SYSTEMD_DISSECT_VERITY_EMBEDDED, ignoring: %m");
2450 if (r == 0)
2451 return 0;
2452
2453 d = PARTITION_VERITY_SIG_OF(verity->designator < 0 ? PARTITION_ROOT : verity->designator);
2454 assert(d >= 0);
2455
2456 p = m->partitions + d;
2457 if (!p->found)
2458 return 0;
2459 if (p->offset == UINT64_MAX || p->size == UINT64_MAX)
2460 return -EINVAL;
2461
2462 if (p->size > 4*1024*1024) /* Signature data cannot possible be larger than 4M, refuse that */
2463 return -EFBIG;
2464
2465 buf = new(char, p->size+1);
2466 if (!buf)
2467 return -ENOMEM;
2468
2469 n = pread(fd, buf, p->size, p->offset);
2470 if (n < 0)
2471 return -ENOMEM;
2472 if ((uint64_t) n != p->size)
2473 return -EIO;
2474
2475 e = memchr(buf, 0, p->size);
2476 if (e) {
2477 /* If we found a NUL byte then the rest of the data must be NUL too */
2478 if (!memeqzero(e, p->size - (e - buf)))
2479 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Signature data contains embedded NUL byte.");
2480 } else
2481 buf[p->size] = 0;
2482
2483 r = json_parse(buf, 0, &v, NULL, NULL);
2484 if (r < 0)
2485 return log_debug_errno(r, "Failed to parse signature JSON data: %m");
2486
2487 rh = json_variant_by_key(v, "rootHash");
2488 if (!rh)
2489 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Signature JSON object lacks 'rootHash' field.");
2490 if (!json_variant_is_string(rh))
2491 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "'rootHash' field of signature JSON object is not a string.");
2492
2493 r = unhexmem(json_variant_string(rh), SIZE_MAX, &root_hash, &root_hash_size);
2494 if (r < 0)
2495 return log_debug_errno(r, "Failed to parse root hash field: %m");
2496
2497 /* Check if specified root hash matches if it is specified */
2498 if (verity->root_hash &&
2499 memcmp_nn(verity->root_hash, verity->root_hash_size, root_hash, root_hash_size) != 0) {
2500 _cleanup_free_ char *a = NULL, *b = NULL;
2501
2502 a = hexmem(root_hash, root_hash_size);
2503 b = hexmem(verity->root_hash, verity->root_hash_size);
2504
2505 return log_debug_errno(r, "Root hash in signature JSON data (%s) doesn't match configured hash (%s).", strna(a), strna(b));
2506 }
2507
2508 sig = json_variant_by_key(v, "signature");
2509 if (!sig)
2510 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Signature JSON object lacks 'signature' field.");
2511 if (!json_variant_is_string(sig))
2512 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "'signature' field of signature JSON object is not a string.");
2513
2514 r = unbase64mem(json_variant_string(sig), SIZE_MAX, &root_hash_sig, &root_hash_sig_size);
2515 if (r < 0)
2516 return log_debug_errno(r, "Failed to parse signature field: %m");
2517
2518 free_and_replace(verity->root_hash, root_hash);
2519 verity->root_hash_size = root_hash_size;
2520
2521 free_and_replace(verity->root_hash_sig, root_hash_sig);
2522 verity->root_hash_sig_size = root_hash_sig_size;
2523
2524 return 1;
2525}
2526
22847508 2527int dissected_image_acquire_metadata(DissectedImage *m, DissectImageFlags extra_flags) {
3b925504
LP		 2528
2529 enum {
2530 META_HOSTNAME,
2531 META_MACHINE_ID,
2532 META_MACHINE_INFO,
2533 META_OS_RELEASE,
7718ac97 2534 META_EXTENSION_RELEASE,
a4e0d617 2535 META_HAS_INIT_SYSTEM,
3b925504
LP		 2536 _META_MAX,
2537 };
2538
9a4b883b 2539 static const char *const paths[_META_MAX] = {
7718ac97
LB		 2540 [META_HOSTNAME] = "/etc/hostname\0",
2541 [META_MACHINE_ID] = "/etc/machine-id\0",
2542 [META_MACHINE_INFO] = "/etc/machine-info\0",
9a4b883b 2543 [META_OS_RELEASE] = ("/etc/os-release\0"
22847508 2544 "/usr/lib/os-release\0"),
a4e0d617
LP		 2545 [META_EXTENSION_RELEASE] = "extension-release\0", /* Used only for logging. */
2546 [META_HAS_INIT_SYSTEM] = "has-init-system\0", /* ditto */
3b925504
LP		 2547 };
2548
7718ac97 2549 _cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL, **extension_release = NULL;
af8219d5 2550 _cleanup_close_pair_ int error_pipe[2] = { -1, -1 };
3b925504
LP		 2551 _cleanup_(rmdir_and_freep) char *t = NULL;
2552 _cleanup_(sigkill_waitp) pid_t child = 0;
2553 sd_id128_t machine_id = SD_ID128_NULL;
2554 _cleanup_free_ char *hostname = NULL;
67f63ee5 2555 unsigned n_meta_initialized = 0;
af8219d5 2556 int fds[2 * _META_MAX], r, v;
a4e0d617 2557 int has_init_system = -1;
af8219d5 2558 ssize_t n;
3b925504
LP		 2559
2560 BLOCK_SIGNALS(SIGCHLD);
2561
2562 assert(m);
2563
7718ac97 2564 for (; n_meta_initialized < _META_MAX; n_meta_initialized ++) {
d9119c00
LP		 2565 if (!paths[n_meta_initialized]) {
2566 fds[2*n_meta_initialized] = fds[2*n_meta_initialized+1] = -1;
7718ac97 2567 continue;
d9119c00
LP		 2568 }
2569
3b925504
LP		 2570 if (pipe2(fds + 2*n_meta_initialized, O_CLOEXEC) < 0) {
2571 r = -errno;
2572 goto finish;
2573 }
7718ac97 2574 }
3b925504
LP		 2575
2576 r = mkdtemp_malloc("/tmp/dissect-XXXXXX", &t);
2577 if (r < 0)
2578 goto finish;
2579
af8219d5
LP		 2580 if (pipe2(error_pipe, O_CLOEXEC) < 0) {
2581 r = -errno;
2582 goto finish;
2583 }
2584
e2047ba9 2585 r = safe_fork("(sd-dissect)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_NEW_MOUNTNS|FORK_MOUNTNS_SLAVE, &child);
be39f6ee 2586 if (r < 0)
3b925504 2587 goto finish;
be39f6ee 2588 if (r == 0) {
a4e0d617 2589 /* Child in a new mount namespace */
af8219d5
LP		 2590 error_pipe[0] = safe_close(error_pipe[0]);
2591
7cf66030
LP		 2592 r = dissected_image_mount(
2593 m,
2594 t,
2595 UID_INVALID,
21b61b1d 2596 UID_INVALID,
22847508
ZJS		 2597 extra_flags |
2598 DISSECT_IMAGE_READ_ONLY |
2599 DISSECT_IMAGE_MOUNT_ROOT_ONLY |
7cf66030 2600 DISSECT_IMAGE_USR_NO_ROOT);
429d4e41
LP		 2601 if (r < 0) {
2602 log_debug_errno(r, "Failed to mount dissected image: %m");
03ae68f4 2603 goto inner_fail;
429d4e41 2604 }
3b925504 2605
67f63ee5 2606 for (unsigned k = 0; k < _META_MAX; k++) {
37e44c3f 2607 _cleanup_close_ int fd = -ENOENT;
3b925504
LP		 2608 const char *p;
2609
7718ac97
LB		 2610 if (!paths[k])
2611 continue;
2612
3b925504
LP		 2613 fds[2*k] = safe_close(fds[2*k]);
2614
a4e0d617
LP		 2615 switch (k) {
2616
2617 case META_EXTENSION_RELEASE:
9a4b883b
LB		 2618 /* As per the os-release spec, if the image is an extension it will have a file
2619 * named after the image name in extension-release.d/ - we use the image name
2620 * and try to resolve it with the extension-release helpers, as sometimes
2621 * the image names are mangled on deployment and do not match anymore.
2622 * Unlike other paths this is not fixed, and the image name
2623 * can be mangled on deployment, so by calling into the helper
2624 * we allow a fallback that matches on the first extension-release
2625 * file found in the directory, if one named after the image cannot
2626 * be found first. */
2627 r = open_extension_release(t, m->image_name, NULL, &fd);
2628 if (r < 0)
2629 fd = r; /* Propagate the error. */
a4e0d617
LP		 2630 break;
2631
2632 case META_HAS_INIT_SYSTEM: {
2633 bool found = false;
a4e0d617
LP		 2634
2635 FOREACH_STRING(init,
2636 "/usr/lib/systemd/systemd", /* systemd on /usr merged system */
2637 "/lib/systemd/systemd", /* systemd on /usr non-merged systems */
2638 "/sbin/init") { /* traditional path the Linux kernel invokes */
2639
2640 r = chase_symlinks(init, t, CHASE_PREFIX_ROOT, NULL, NULL);
2641 if (r < 0) {
2642 if (r != -ENOENT)
2643 log_debug_errno(r, "Failed to resolve %s, ignoring: %m", init);
2644 } else {
2645 found = true;
2646 break;
2647 }
2648 }
2649
2650 r = loop_write(fds[2*k+1], &found, sizeof(found), false);
2651 if (r < 0)
2652 goto inner_fail;
2653
2654 continue;
2655 }
2656
2657 default:
9a4b883b
LB		 2658 NULSTR_FOREACH(p, paths[k]) {
2659 fd = chase_symlinks_and_open(p, t, CHASE_PREFIX_ROOT, O_RDONLY|O_CLOEXEC|O_NOCTTY, NULL);
2660 if (fd >= 0)
2661 break;
2662 }
a4e0d617
LP		 2663 }
2664
36952d19
LP		 2665 if (fd < 0) {
2666 log_debug_errno(fd, "Failed to read %s file of image, ignoring: %m", paths[k]);
37e44c3f 2667 fds[2*k+1] = safe_close(fds[2*k+1]);
3b925504 2668 continue;
36952d19 2669 }
3b925504 2670
f5fbe71d 2671 r = copy_bytes(fd, fds[2*k+1], UINT64_MAX, 0);
a4e0d617
LP		 2672 if (r < 0)
2673 goto inner_fail;
3b925504
LP		 2674
2675 fds[2*k+1] = safe_close(fds[2*k+1]);
2676 }
2677
2678 _exit(EXIT_SUCCESS);
a4e0d617
LP		 2679
2680 inner_fail:
03ae68f4 2681 /* Let parent know the error */
a4e0d617
LP		 2682 (void) write(error_pipe[1], &r, sizeof(r));
2683 _exit(EXIT_FAILURE);
3b925504
LP		 2684 }
2685
af8219d5
LP		 2686 error_pipe[1] = safe_close(error_pipe[1]);
2687
67f63ee5 2688 for (unsigned k = 0; k < _META_MAX; k++) {
3b925504
LP		 2689 _cleanup_fclose_ FILE *f = NULL;
2690
7718ac97
LB		 2691 if (!paths[k])
2692 continue;
2693
3b925504
LP		 2694 fds[2*k+1] = safe_close(fds[2*k+1]);
2695
4fa744a3 2696 f = take_fdopen(&fds[2*k], "r");
3b925504
LP		 2697 if (!f) {
2698 r = -errno;
2699 goto finish;
2700 }
2701
3b925504
LP		 2702 switch (k) {
2703
2704 case META_HOSTNAME:
2705 r = read_etc_hostname_stream(f, &hostname);
2706 if (r < 0)
f6048e5e 2707 log_debug_errno(r, "Failed to read /etc/hostname of image: %m");
3b925504
LP		 2708
2709 break;
2710
2711 case META_MACHINE_ID: {
2712 _cleanup_free_ char *line = NULL;
2713
2714 r = read_line(f, LONG_LINE_MAX, &line);
2715 if (r < 0)
f6048e5e 2716 log_debug_errno(r, "Failed to read /etc/machine-id of image: %m");
3b925504
LP		 2717 else if (r == 33) {
2718 r = sd_id128_from_string(line, &machine_id);
2719 if (r < 0)
2720 log_debug_errno(r, "Image contains invalid /etc/machine-id: %s", line);
2721 } else if (r == 0)
f6048e5e 2722 log_debug("/etc/machine-id file of image is empty.");
ab763cb2 2723 else if (streq(line, "uninitialized"))
f6048e5e 2724 log_debug("/etc/machine-id file of image is uninitialized (likely aborted first boot).");
3b925504 2725 else
f6048e5e 2726 log_debug("/etc/machine-id file of image has unexpected length %i.", r);
3b925504
LP		 2727
2728 break;
2729 }
2730
2731 case META_MACHINE_INFO:
aa8fbc74 2732 r = load_env_file_pairs(f, "machine-info", &machine_info);
3b925504 2733 if (r < 0)
f6048e5e 2734 log_debug_errno(r, "Failed to read /etc/machine-info of image: %m");
3b925504
LP		 2735
2736 break;
2737
2738 case META_OS_RELEASE:
aa8fbc74 2739 r = load_env_file_pairs(f, "os-release", &os_release);
3b925504 2740 if (r < 0)
f6048e5e 2741 log_debug_errno(r, "Failed to read OS release file of image: %m");
3b925504
LP		 2742
2743 break;
7718ac97
LB		 2744
2745 case META_EXTENSION_RELEASE:
2746 r = load_env_file_pairs(f, "extension-release", &extension_release);
2747 if (r < 0)
f6048e5e 2748 log_debug_errno(r, "Failed to read extension release file of image: %m");
7718ac97
LB		 2749
2750 break;
a4e0d617
LP		 2751
2752 case META_HAS_INIT_SYSTEM: {
2753 bool b = false;
2754 size_t nr;
2755
2756 errno = 0;
2757 nr = fread(&b, 1, sizeof(b), f);
2758 if (nr != sizeof(b))
2759 log_debug_errno(errno_or_else(EIO), "Failed to read has-init-system boolean: %m");
2760 else
2761 has_init_system = b;
2762
2763 break;
2764 }}
3b925504
LP		 2765 }
2766
2e87a1fd 2767 r = wait_for_terminate_and_check("(sd-dissect)", child, 0);
3b925504 2768 child = 0;
2e87a1fd 2769 if (r < 0)
af8219d5
LP		 2770 return r;
2771
2772 n = read(error_pipe[0], &v, sizeof(v));
2773 if (n < 0)
2774 return -errno;
2775 if (n == sizeof(v))
2776 return v; /* propagate error sent to us from child */
2777 if (n != 0)
2778 return -EIO;
2779
2e87a1fd
LP		 2780 if (r != EXIT_SUCCESS)
2781 return -EPROTO;
3b925504
LP		 2782
2783 free_and_replace(m->hostname, hostname);
2784 m->machine_id = machine_id;
2785 strv_free_and_replace(m->machine_info, machine_info);
2786 strv_free_and_replace(m->os_release, os_release);
7718ac97 2787 strv_free_and_replace(m->extension_release, extension_release);
a4e0d617 2788 m->has_init_system = has_init_system;
3b925504
LP		 2789
2790finish:
67f63ee5 2791 for (unsigned k = 0; k < n_meta_initialized; k++)
3b925504
LP		 2792 safe_close_pair(fds + 2*k);
2793
2794 return r;
2795}
2796
bad31660 2797int dissect_loop_device_and_warn(
bad31660 2798 const LoopDevice *loop,
89e62e0b 2799 const VeritySettings *verity,
18d73705 2800 const MountOptions *mount_options,
4526113f
LP		 2801 DissectImageFlags flags,
2802 DissectedImage **ret) {
2803
64dd3a24 2804 const char *name;
4526113f
LP		 2805 int r;
2806
bad31660
YW		 2807 assert(loop);
2808 assert(loop->fd >= 0);
4526113f 2809
64dd3a24 2810 name = ASSERT_PTR(loop->backing_file ?: loop->node);
4526113f 2811
369de26f 2812 r = dissect_loop_device(loop, verity, mount_options, flags, ret);
4526113f
LP		 2813 switch (r) {
2814
2815 case -EOPNOTSUPP:
2816 return log_error_errno(r, "Dissecting images is not supported, compiled without blkid support.");
2817
2818 case -ENOPKG:
48084df6
ZJS		 2819 return log_error_errno(r, "%s: Couldn't identify a suitable partition table or file system.", name);
2820
2821 case -ENOMEDIUM:
2822 return log_error_errno(r, "%s: The image does not pass validation.", name);
4526113f
LP		 2823
2824 case -EADDRNOTAVAIL:
48084df6 2825 return log_error_errno(r, "%s: No root partition for specified root hash found.", name);
4526113f
LP		 2826
2827 case -ENOTUNIQ:
48084df6 2828 return log_error_errno(r, "%s: Multiple suitable root partitions found in image.", name);
4526113f
LP		 2829
2830 case -ENXIO:
48084df6 2831 return log_error_errno(r, "%s: No suitable root partition found in image.", name);
4526113f
LP		 2832
2833 case -EPROTONOSUPPORT:
2834 return log_error_errno(r, "Device '%s' is loopback block device with partition scanning turned off, please turn it on.", name);
2835
48084df6
ZJS		 2836 case -ENOTBLK:
2837 return log_error_errno(r, "%s: Image is not a block device.", name);
2838
a94aa2b9
LP		 2839 case -EBADR:
2840 return log_error_errno(r,
2841 "Combining partitioned images (such as '%s') with external Verity data (such as '%s') not supported. "
2842 "(Consider setting $SYSTEMD_DISSECT_VERITY_SIDECAR=0 to disable automatic discovery of external Verity data.)",
2843 name, strna(verity ? verity->data_path : NULL));
2844
4526113f
LP		 2845 default:
2846 if (r < 0)
2847 return log_error_errno(r, "Failed to dissect image '%s': %m", name);
2848
2849 return r;
2850 }
2851}
2852
49536766
LP		 2853bool dissected_image_verity_candidate(const DissectedImage *image, PartitionDesignator partition_designator) {
2854 assert(image);
2855
2856 /* Checks if this partition could theoretically do Verity. For non-partitioned images this only works
2857 * if there's an external verity file supplied, for which we can consult .has_verity. For partitioned
2858 * images we only check the partition type.
2859 *
2860 * This call is used to decide whether to suppress or show a verity column in tabular output of the
2861 * image. */
2862
e7cbe5cb 2863 if (image->single_file_system)
c3c88d67 2864 return partition_designator == PARTITION_ROOT && image->has_verity;
e7cbe5cb
LB		 2865
2866 return PARTITION_VERITY_OF(partition_designator) >= 0;
2867}
2868
49536766
LP		 2869bool dissected_image_verity_ready(const DissectedImage *image, PartitionDesignator partition_designator) {
2870 PartitionDesignator k;
2871
2872 assert(image);
2873
2874 /* Checks if this partition has verity data available that we can activate. For non-partitioned this
2875 * works for the root partition, for others only if the associated verity partition was found. */
2876
2877 if (!image->verity_ready)
2878 return false;
e7cbe5cb
LB		 2879
2880 if (image->single_file_system)
49536766 2881 return partition_designator == PARTITION_ROOT;
e7cbe5cb
LB		 2882
2883 k = PARTITION_VERITY_OF(partition_designator);
2884 return k >= 0 && image->partitions[k].found;
2885}
2886
8ee9615e
LP		 2887bool dissected_image_verity_sig_ready(const DissectedImage *image, PartitionDesignator partition_designator) {
2888 PartitionDesignator k;
2889
2890 assert(image);
2891
2892 /* Checks if this partition has verity signature data available that we can use. */
2893
2894 if (!image->verity_sig_ready)
2895 return false;
2896
2897 if (image->single_file_system)
2898 return partition_designator == PARTITION_ROOT;
2899
2900 k = PARTITION_VERITY_SIG_OF(partition_designator);
2901 return k >= 0 && image->partitions[k].found;
2902}
2903
18d73705
LB		 2904MountOptions* mount_options_free_all(MountOptions *options) {
2905 MountOptions *m;
2906
2907 while ((m = options)) {
2908 LIST_REMOVE(mount_options, options, m);
2909 free(m->options);
2910 free(m);
2911 }
2912
2913 return NULL;
2914}
2915
569a0e42 2916const char* mount_options_from_designator(const MountOptions *options, PartitionDesignator designator) {
f5215bc8 2917 LIST_FOREACH(mount_options, m, options)
9ece6444 2918 if (designator == m->partition_designator && !isempty(m->options))
18d73705 2919 return m->options;
6aa05ebd 2920
18d73705
LB		 2921 return NULL;
2922}
2923
6aa05ebd
LP		 2924int mount_image_privately_interactively(
2925 const char *image,
2926 DissectImageFlags flags,
2927 char **ret_directory,
2928 LoopDevice **ret_loop_device,
2929 DecryptedImage **ret_decrypted_image) {
2930
27ec815e 2931 _cleanup_(verity_settings_done) VeritySettings verity = VERITY_SETTINGS_DEFAULT;
6aa05ebd
LP		 2932 _cleanup_(loop_device_unrefp) LoopDevice *d = NULL;
2933 _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL;
2934 _cleanup_(dissected_image_unrefp) DissectedImage *dissected_image = NULL;
2935 _cleanup_(rmdir_and_freep) char *created_dir = NULL;
2936 _cleanup_free_ char *temp = NULL;
2937 int r;
2938
2939 /* Mounts an OS image at a temporary place, inside a newly created mount namespace of our own. This
2940 * is used by tools such as systemd-tmpfiles or systemd-firstboot to operate on some disk image
2941 * easily. */
2942
2943 assert(image);
2944 assert(ret_directory);
2945 assert(ret_loop_device);
2946 assert(ret_decrypted_image);
2947
27ec815e
LP		 2948 r = verity_settings_load(&verity, image, NULL, NULL);
2949 if (r < 0)
2950 return log_error_errno(r, "Failed to load root hash data: %m");
2951
6aa05ebd
LP		 2952 r = tempfn_random_child(NULL, program_invocation_short_name, &temp);
2953 if (r < 0)
2954 return log_error_errno(r, "Failed to generate temporary mount directory: %m");
2955
2956 r = loop_device_make_by_path(
2957 image,
ef9c184d 2958 FLAGS_SET(flags, DISSECT_IMAGE_DEVICE_READ_ONLY) ? O_RDONLY : O_RDWR,
6aa05ebd 2959 FLAGS_SET(flags, DISSECT_IMAGE_NO_PARTITION_TABLE) ? 0 : LO_FLAGS_PARTSCAN,
7f52206a 2960 LOCK_SH,
6aa05ebd
LP		 2961 &d);
2962 if (r < 0)
7b87fe4c 2963 return log_error_errno(r, "Failed to set up loopback device for %s: %m", image);
6aa05ebd 2964
64dd3a24 2965 r = dissect_loop_device_and_warn(d, &verity, NULL, flags, &dissected_image);
6aa05ebd
LP		 2966 if (r < 0)
2967 return r;
2968
88b3300f
LP		 2969 r = dissected_image_load_verity_sig_partition(dissected_image, d->fd, &verity);
2970 if (r < 0)
2971 return r;
2972
27ec815e 2973 r = dissected_image_decrypt_interactively(dissected_image, NULL, &verity, flags, &decrypted_image);
6aa05ebd
LP		 2974 if (r < 0)
2975 return r;
2976
2977 r = detach_mount_namespace();
2978 if (r < 0)
2979 return log_error_errno(r, "Failed to detach mount namespace: %m");
2980
2981 r = mkdir_p(temp, 0700);
2982 if (r < 0)
2983 return log_error_errno(r, "Failed to create mount point: %m");
2984
2985 created_dir = TAKE_PTR(temp);
2986
21b61b1d 2987 r = dissected_image_mount_and_warn(dissected_image, created_dir, UID_INVALID, UID_INVALID, flags);
6aa05ebd 2988 if (r < 0)
af187ab2 2989 return r;
6aa05ebd 2990
41bc4849
LP		 2991 r = loop_device_flock(d, LOCK_UN);
2992 if (r < 0)
2993 return r;
2994
6aa05ebd
LP		 2995 if (decrypted_image) {
2996 r = decrypted_image_relinquish(decrypted_image);
2997 if (r < 0)
2998 return log_error_errno(r, "Failed to relinquish DM devices: %m");
2999 }
3000
3001 loop_device_relinquish(d);
3002
3003 *ret_directory = TAKE_PTR(created_dir);
3004 *ret_loop_device = TAKE_PTR(d);
3005 *ret_decrypted_image = TAKE_PTR(decrypted_image);
3006
3007 return 0;
3008}
3009
8c1be37e 3010static const char *const partition_designator_table[] = {
68ac5118
ZJS		 3011 [PARTITION_ROOT] = "root",
3012 [PARTITION_ROOT_SECONDARY] = "root-secondary",
3013 [PARTITION_ROOT_OTHER] = "root-other",
3014 [PARTITION_USR] = "usr",
3015 [PARTITION_USR_SECONDARY] = "usr-secondary",
3016 [PARTITION_USR_OTHER] = "usr-other",
3017 [PARTITION_HOME] = "home",
3018 [PARTITION_SRV] = "srv",
3019 [PARTITION_ESP] = "esp",
3020 [PARTITION_XBOOTLDR] = "xbootldr",
3021 [PARTITION_SWAP] = "swap",
3022 [PARTITION_ROOT_VERITY] = "root-verity",
3023 [PARTITION_ROOT_SECONDARY_VERITY] = "root-secondary-verity",
3024 [PARTITION_ROOT_OTHER_VERITY] = "root-other-verity",
3025 [PARTITION_USR_VERITY] = "usr-verity",
3026 [PARTITION_USR_SECONDARY_VERITY] = "usr-secondary-verity",
3027 [PARTITION_USR_OTHER_VERITY] = "usr-other-verity",
3028 [PARTITION_ROOT_VERITY_SIG] = "root-verity-sig",
8ee9615e 3029 [PARTITION_ROOT_SECONDARY_VERITY_SIG] = "root-secondary-verity-sig",
68ac5118
ZJS		 3030 [PARTITION_ROOT_OTHER_VERITY_SIG] = "root-other-verity-sig",
3031 [PARTITION_USR_VERITY_SIG] = "usr-verity-sig",
3032 [PARTITION_USR_SECONDARY_VERITY_SIG] = "usr-secondary-verity-sig",
3033 [PARTITION_USR_OTHER_VERITY_SIG] = "usr-other-verity-sig",
3034 [PARTITION_TMP] = "tmp",
3035 [PARTITION_VAR] = "var",
8c1be37e
LP		 3036};
3037
93f59701 3038int verity_dissect_and_mount(
cedf5b1a 3039 int src_fd,
93f59701
LB		 3040 const char *src,
3041 const char *dest,
3042 const MountOptions *options,
3043 const char *required_host_os_release_id,
3044 const char *required_host_os_release_version_id,
60c5f700
LP		 3045 const char *required_host_os_release_sysext_level,
3046 const char *required_sysext_scope) {
93f59701 3047
4beda316
LB		 3048 _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL;
3049 _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL;
3050 _cleanup_(dissected_image_unrefp) DissectedImage *dissected_image = NULL;
3051 _cleanup_(verity_settings_done) VeritySettings verity = VERITY_SETTINGS_DEFAULT;
3052 DissectImageFlags dissect_image_flags;
3053 int r;
3054
3055 assert(src);
3056 assert(dest);
3057
cedf5b1a 3058 /* We might get an FD for the image, but we use the original path to look for the dm-verity files */
4beda316
LB		 3059 r = verity_settings_load(&verity, src, NULL, NULL);
3060 if (r < 0)
3061 return log_debug_errno(r, "Failed to load root hash: %m");
3062
3063 dissect_image_flags = verity.data_path ? DISSECT_IMAGE_NO_PARTITION_TABLE : 0;
3064
cedf5b1a
LB		 3065 /* Note that we don't use loop_device_make here, as the FD is most likely O_PATH which would not be
3066 * accepted by LOOP_CONFIGURE, so just let loop_device_make_by_path reopen it as a regular FD. */
4beda316 3067 r = loop_device_make_by_path(
cedf5b1a 3068 src_fd >= 0 ? FORMAT_PROC_FD_PATH(src_fd) : src,
4beda316
LB		 3069 -1,
3070 verity.data_path ? 0 : LO_FLAGS_PARTSCAN,
7f52206a 3071 LOCK_SH,
4beda316
LB		 3072 &loop_device);
3073 if (r < 0)
3074 return log_debug_errno(r, "Failed to create loop device for image: %m");
3075
bad31660
YW		 3076 r = dissect_loop_device(
3077 loop_device,
4beda316
LB		 3078 &verity,
3079 options,
3080 dissect_image_flags,
3081 &dissected_image);
3082 /* No partition table? Might be a single-filesystem image, try again */
3083 if (!verity.data_path && r == -ENOPKG)
bad31660
YW		 3084 r = dissect_loop_device(
3085 loop_device,
4beda316
LB		 3086 &verity,
3087 options,
75dc190d 3088 dissect_image_flags | DISSECT_IMAGE_NO_PARTITION_TABLE,
4beda316
LB		 3089 &dissected_image);
3090 if (r < 0)
3091 return log_debug_errno(r, "Failed to dissect image: %m");
3092
88b3300f
LP		 3093 r = dissected_image_load_verity_sig_partition(dissected_image, loop_device->fd, &verity);
3094 if (r < 0)
3095 return r;
3096
4beda316
LB		 3097 r = dissected_image_decrypt(
3098 dissected_image,
3099 NULL,
3100 &verity,
3101 dissect_image_flags,
3102 &decrypted_image);
3103 if (r < 0)
3104 return log_debug_errno(r, "Failed to decrypt dissected image: %m");
3105
3106 r = mkdir_p_label(dest, 0755);
3107 if (r < 0)
3108 return log_debug_errno(r, "Failed to create destination directory %s: %m", dest);
3109 r = umount_recursive(dest, 0);
3110 if (r < 0)
3111 return log_debug_errno(r, "Failed to umount under destination directory %s: %m", dest);
3112
21b61b1d 3113 r = dissected_image_mount(dissected_image, dest, UID_INVALID, UID_INVALID, dissect_image_flags);
4beda316
LB		 3114 if (r < 0)
3115 return log_debug_errno(r, "Failed to mount image: %m");
3116
41bc4849
LP		 3117 r = loop_device_flock(loop_device, LOCK_UN);
3118 if (r < 0)
3119 return log_debug_errno(r, "Failed to unlock loopback device: %m");
3120
93f59701
LB		 3121 /* If we got os-release values from the caller, then we need to match them with the image's
3122 * extension-release.d/ content. Return -EINVAL if there's any mismatch.
3123 * First, check the distro ID. If that matches, then check the new SYSEXT_LEVEL value if
37361f46
LB		 3124 * available, or else fallback to VERSION_ID. If neither is present (eg: rolling release),
3125 * then a simple match on the ID will be performed. */
8b2dcbbd 3126 if (required_host_os_release_id) {
93f59701
LB		 3127 _cleanup_strv_free_ char **extension_release = NULL;
3128
d30d86b7
YW		 3129 assert(!isempty(required_host_os_release_id));
3130
93f59701
LB		 3131 r = load_extension_release_pairs(dest, dissected_image->image_name, &extension_release);
3132 if (r < 0)
3133 return log_debug_errno(r, "Failed to parse image %s extension-release metadata: %m", dissected_image->image_name);
3134
3135 r = extension_release_validate(
60c5f700
LP		 3136 dissected_image->image_name,
3137 required_host_os_release_id,
3138 required_host_os_release_version_id,
3139 required_host_os_release_sysext_level,
3140 required_sysext_scope,
3141 extension_release);
93f59701
LB		 3142 if (r == 0)
3143 return log_debug_errno(SYNTHETIC_ERRNO(ESTALE), "Image %s extension-release metadata does not match the root's", dissected_image->image_name);
3144 if (r < 0)
3145 return log_debug_errno(r, "Failed to compare image %s extension-release metadata with the root's os-release: %m", dissected_image->image_name);
3146 }
3147
4beda316
LB		 3148 if (decrypted_image) {
3149 r = decrypted_image_relinquish(decrypted_image);
3150 if (r < 0)
3151 return log_debug_errno(r, "Failed to relinquish decrypted image: %m");
3152 }
3153
3154 loop_device_relinquish(loop_device);
3155
3156 return 0;
3157}
3158
569a0e42 3159DEFINE_STRING_TABLE_LOOKUP(partition_designator, PartitionDesignator);
Unnamed repository; edit this file 'description' to name the repository.