]> git.ipfire.org Git - thirdparty/systemd.git/blame - src/shared/dissect-image.c
projects / thirdparty / systemd.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
nspawn: mkdir selinux mount point once, but not twice
[thirdparty/systemd.git] / src / shared / dissect-image.c
CommitLineData
53e1b683 1/* SPDX-License-Identifier: LGPL-2.1+ */
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>
8c1be37e 9#include <sys/mount.h>
3b925504
LP		 10#include <sys/prctl.h>
11#include <sys/wait.h>
8c1be37e 12
3c1f2cee 13#include "sd-device.h"
dccca82b
LP		 14#include "sd-id128.h"
15
8c1be37e 16#include "architecture.h"
18b5886e 17#include "ask-password-api.h"
8c1be37e 18#include "blkid-util.h"
18c528e9 19#include "blockdev-util.h"
3b925504 20#include "copy.h"
294bd454 21#include "crypt-util.h"
3b925504 22#include "def.h"
553e15f2 23#include "device-nodes.h"
8437c059 24#include "device-util.h"
8c1be37e 25#include "dissect-image.h"
a709a315 26#include "dm-util.h"
686d13b9 27#include "env-file.h"
18b5886e 28#include "fd-util.h"
78ebe980 29#include "fileio.h"
2eedfd2d 30#include "fs-util.h"
cf32c486 31#include "fsck-util.h"
8c1be37e 32#include "gpt.h"
78ebe980 33#include "hexdecoct.h"
3b925504
LP		 34#include "hostname-util.h"
35#include "id128-util.h"
8c1be37e 36#include "mount-util.h"
e4de7287 37#include "mountpoint-util.h"
d8b4d14d 38#include "nulstr-util.h"
d58ad743 39#include "os-util.h"
8c1be37e 40#include "path-util.h"
3b925504
LP		 41#include "process-util.h"
42#include "raw-clone.h"
43#include "signal-util.h"
8c1be37e 44#include "stat-util.h"
18b5886e 45#include "stdio-util.h"
8c1be37e
LP		 46#include "string-table.h"
47#include "string-util.h"
2eedfd2d 48#include "strv.h"
e4de7287 49#include "tmpfile-util.h"
a8040b6d 50#include "udev-util.h"
2d3a5a73 51#include "user-util.h"
41488e1f 52#include "xattr-util.h"
8c1be37e 53
c34b75a1 54int probe_filesystem(const char *node, char **ret_fstype) {
7cc84b2c 55 /* Try to find device content type and return it in *ret_fstype. If nothing is found,
5238e957 56 * 0/NULL will be returned. -EUCLEAN will be returned for ambiguous results, and an
7cc84b2c
ZJS		 57 * different error otherwise. */
58
349cc4a5 59#if HAVE_BLKID
8e766630 60 _cleanup_(blkid_free_probep) blkid_probe b = NULL;
18b5886e
LP		 61 const char *fstype;
62 int r;
63
995fa2e5 64 errno = 0;
18b5886e
LP		 65 b = blkid_new_probe_from_filename(node);
66 if (!b)
66855de7 67 return errno_or_else(ENOMEM);
18b5886e
LP		 68
69 blkid_probe_enable_superblocks(b, 1);
70 blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE);
71
72 errno = 0;
73 r = blkid_do_safeprobe(b);
7cc84b2c
ZJS		 74 if (r == 1) {
75 log_debug("No type detected on partition %s", node);
18b5886e
LP		 76 goto not_found;
77 }
58dfbfbd
LP		 78 if (r == -2)
79 return log_debug_errno(SYNTHETIC_ERRNO(EUCLEAN),
80 "Results ambiguous for partition %s", node);
b382db9f 81 if (r != 0)
66855de7 82 return errno_or_else(EIO);
18b5886e
LP		 83
84 (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
85
86 if (fstype) {
87 char *t;
88
89 t = strdup(fstype);
90 if (!t)
91 return -ENOMEM;
92
93 *ret_fstype = t;
94 return 1;
95 }
96
97not_found:
98 *ret_fstype = NULL;
99 return 0;
d1c536f5
ZJS		 100#else
101 return -EOPNOTSUPP;
a75e27eb 102#endif
d1c536f5 103}
18b5886e 104
40c10d3f 105#if HAVE_BLKID
cde942f6
JPRV		 106/* Detect RPMB and Boot partitions, which are not listed by blkid.
107 * See https://github.com/systemd/systemd/issues/5806. */
3c1f2cee 108static bool device_is_mmc_special_partition(sd_device *d) {
aae22eb3
LP		 109 const char *sysname;
110
f70e7f70
LP		 111 assert(d);
112
3c1f2cee
YW		 113 if (sd_device_get_sysname(d, &sysname) < 0)
114 return false;
115
116 return startswith(sysname, "mmcblk") &&
0cfa78dd 117 (endswith(sysname, "rpmb") || endswith(sysname, "boot0") || endswith(sysname, "boot1"));
cde942f6
JPRV		 118}
119
3c1f2cee 120static bool device_is_block(sd_device *d) {
aae22eb3
LP		 121 const char *ss;
122
f70e7f70
LP		 123 assert(d);
124
3c1f2cee 125 if (sd_device_get_subsystem(d, &ss) < 0)
aae22eb3
LP		 126 return false;
127
128 return streq(ss, "block");
129}
ea887be0
ZJS		 130
131static int enumerator_for_parent(sd_device *d, sd_device_enumerator **ret) {
132 _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
133 int r;
134
f70e7f70
LP		 135 assert(d);
136 assert(ret);
137
ea887be0
ZJS		 138 r = sd_device_enumerator_new(&e);
139 if (r < 0)
140 return r;
141
142 r = sd_device_enumerator_allow_uninitialized(e);
143 if (r < 0)
144 return r;
145
146 r = sd_device_enumerator_add_match_parent(e, d);
147 if (r < 0)
148 return r;
149
150 *ret = TAKE_PTR(e);
151 return 0;
152}
153
154/* how many times to wait for the device nodes to appear */
155#define N_DEVICE_NODE_LIST_ATTEMPTS 10
156
157static int wait_for_partitions_to_appear(
158 int fd,
159 sd_device *d,
160 unsigned num_partitions,
052eaf5c 161 DissectImageFlags flags,
ea887be0
ZJS		 162 sd_device_enumerator **ret_enumerator) {
163
164 _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
165 sd_device *q;
166 unsigned n;
167 int r;
168
f70e7f70
LP		 169 assert(fd >= 0);
170 assert(d);
171 assert(ret_enumerator);
172
ea887be0
ZJS		 173 r = enumerator_for_parent(d, &e);
174 if (r < 0)
175 return r;
176
177 /* Count the partitions enumerated by the kernel */
178 n = 0;
179 FOREACH_DEVICE(e, q) {
180 if (sd_device_get_devnum(q, NULL) < 0)
181 continue;
182 if (!device_is_block(q))
183 continue;
184 if (device_is_mmc_special_partition(q))
185 continue;
186
052eaf5c 187 if (!FLAGS_SET(flags, DISSECT_IMAGE_NO_UDEV)) {
1b47436e 188 r = device_wait_for_initialization(q, "block", USEC_INFINITY, NULL);
052eaf5c
LP		 189 if (r < 0)
190 return r;
191 }
a8040b6d 192
ea887be0
ZJS		 193 n++;
194 }
195
196 if (n == num_partitions + 1) {
197 *ret_enumerator = TAKE_PTR(e);
198 return 0; /* success! */
199 }
200 if (n > num_partitions + 1)
201 return log_debug_errno(SYNTHETIC_ERRNO(EIO),
202 "blkid and kernel partition lists do not match.");
203
204 /* The kernel has probed fewer partitions than blkid? Maybe the kernel prober is still running or it
205 * got EBUSY because udev already opened the device. Let's reprobe the device, which is a synchronous
206 * call that waits until probing is complete. */
207
208 for (unsigned j = 0; ; j++) {
209 if (j++ > 20)
210 return -EBUSY;
211
212 if (ioctl(fd, BLKRRPART, 0) >= 0)
213 break;
214 r = -errno;
215 if (r == -EINVAL) {
216 struct loop_info64 info;
217
218 /* If we are running on a loop device that has partition scanning off, return
219 * an explicit recognizable error about this, so that callers can generate a
220 * proper message explaining the situation. */
221
10c1b188
LP		 222 if (ioctl(fd, LOOP_GET_STATUS64, &info) >= 0) {
223#if HAVE_VALGRIND_MEMCHECK_H
224 /* Valgrind currently doesn't know LOOP_GET_STATUS64. Remove this once it does */
225 VALGRIND_MAKE_MEM_DEFINED(&info, sizeof(info));
226#endif
227
228 if ((info.lo_flags & LO_FLAGS_PARTSCAN) == 0)
229 return log_debug_errno(EPROTONOSUPPORT,
230 "Device is a loop device and partition scanning is off!");
ea887be0
ZJS		 231 }
232 }
233 if (r != -EBUSY)
234 return r;
235
236 /* If something else has the device open, such as an udev rule, the ioctl will return
237 * EBUSY. Since there's no way to wait until it isn't busy anymore, let's just wait a bit,
238 * and try again.
239 *
240 * This is really something they should fix in the kernel! */
241 (void) usleep(50 * USEC_PER_MSEC);
242
243 }
244
245 return -EAGAIN; /* no success yet, try again */
246}
247
248static int loop_wait_for_partitions_to_appear(
249 int fd,
250 sd_device *d,
251 unsigned num_partitions,
052eaf5c 252 DissectImageFlags flags,
ea887be0 253 sd_device_enumerator **ret_enumerator) {
a8040b6d 254 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
ea887be0
ZJS		 255 int r;
256
f70e7f70
LP		 257 assert(fd >= 0);
258 assert(d);
259 assert(ret_enumerator);
260
b887c8b8
ZJS		 261 log_debug("Waiting for device (parent + %d partitions) to appear...", num_partitions);
262
052eaf5c 263 if (!FLAGS_SET(flags, DISSECT_IMAGE_NO_UDEV)) {
1b47436e 264 r = device_wait_for_initialization(d, "block", USEC_INFINITY, &device);
052eaf5c
LP		 265 if (r < 0)
266 return r;
267 } else
268 device = sd_device_ref(d);
a8040b6d 269
ea887be0 270 for (unsigned i = 0; i < N_DEVICE_NODE_LIST_ATTEMPTS; i++) {
052eaf5c 271 r = wait_for_partitions_to_appear(fd, device, num_partitions, flags, ret_enumerator);
ea887be0
ZJS		 272 if (r != -EAGAIN)
273 return r;
274 }
275
276 return log_debug_errno(SYNTHETIC_ERRNO(ENXIO),
277 "Kernel partitions dit not appear within %d attempts",
278 N_DEVICE_NODE_LIST_ATTEMPTS);
279}
280
0f7c9a3d
LP		 281static void check_partition_flags(
282 const char *node,
283 unsigned long long pflags,
284 unsigned long long supported) {
285
286 assert(node);
287
288 /* Mask away all flags supported by this partition's type and the three flags the UEFI spec defines generically */
289 pflags &= ~(supported | GPT_FLAG_REQUIRED_PARTITION | GPT_FLAG_NO_BLOCK_IO_PROTOCOL | GPT_FLAG_LEGACY_BIOS_BOOTABLE);
290
291 if (pflags == 0)
292 return;
293
294 /* If there are other bits set, then log about it, to make things discoverable */
295 for (unsigned i = 0; i < sizeof(pflags) * 8; i++) {
296 unsigned long long bit = 1ULL << i;
297 if (!FLAGS_SET(pflags, bit))
298 continue;
299
300 log_debug("Unexpected partition flag %llu set on %s!", bit, node);
301 }
302}
303
40c10d3f 304#endif
aae22eb3 305
4526113f
LP		 306int dissect_image(
307 int fd,
308 const void *root_hash,
309 size_t root_hash_size,
e7cbe5cb 310 const char *verity_data,
4526113f
LP		 311 DissectImageFlags flags,
312 DissectedImage **ret) {
8c1be37e 313
349cc4a5 314#if HAVE_BLKID
4623e8e6 315 sd_id128_t root_uuid = SD_ID128_NULL, verity_uuid = SD_ID128_NULL;
3c1f2cee 316 _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
8c1be37e 317 bool is_gpt, is_mbr, generic_rw, multiple_generic = false;
3c1f2cee 318 _cleanup_(sd_device_unrefp) sd_device *d = NULL;
8c1be37e 319 _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL;
8e766630 320 _cleanup_(blkid_free_probep) blkid_probe b = NULL;
8c1be37e 321 _cleanup_free_ char *generic_node = NULL;
be30ad41 322 sd_id128_t generic_uuid = SD_ID128_NULL;
9b6deb03 323 const char *pttype = NULL;
8c1be37e
LP		 324 blkid_partlist pl;
325 int r, generic_nr;
326 struct stat st;
3c1f2cee 327 sd_device *q;
8c1be37e
LP		 328 unsigned i;
329
330 assert(fd >= 0);
331 assert(ret);
4623e8e6 332 assert(root_hash || root_hash_size == 0);
e7cbe5cb 333 assert(!((flags & DISSECT_IMAGE_GPT_ONLY) && (flags & DISSECT_IMAGE_NO_PARTITION_TABLE)));
8c1be37e
LP		 334
335 /* Probes a disk image, and returns information about what it found in *ret.
336 *
4623e8e6
LP		 337 * Returns -ENOPKG if no suitable partition table or file system could be found.
338 * Returns -EADDRNOTAVAIL if a root hash was specified but no matching root/verity partitions found. */
339
340 if (root_hash) {
341 /* If a root hash is supplied, then we use the root partition that has a UUID that match the first
342 * 128bit of the root hash. And we use the verity partition that has a UUID that match the final
343 * 128bit. */
344
345 if (root_hash_size < sizeof(sd_id128_t))
346 return -EINVAL;
347
348 memcpy(&root_uuid, root_hash, sizeof(sd_id128_t));
349 memcpy(&verity_uuid, (const uint8_t*) root_hash + root_hash_size - sizeof(sd_id128_t), sizeof(sd_id128_t));
350
351 if (sd_id128_is_null(root_uuid))
352 return -EINVAL;
353 if (sd_id128_is_null(verity_uuid))
354 return -EINVAL;
355 }
8c1be37e
LP		 356
357 if (fstat(fd, &st) < 0)
358 return -errno;
359
360 if (!S_ISBLK(st.st_mode))
361 return -ENOTBLK;
362
363 b = blkid_new_probe();
364 if (!b)
365 return -ENOMEM;
366
367 errno = 0;
368 r = blkid_probe_set_device(b, fd, 0, 0);
b382db9f 369 if (r != 0)
66855de7 370 return errno_or_else(ENOMEM);
8c1be37e 371
9b6deb03
LP		 372 if ((flags & DISSECT_IMAGE_GPT_ONLY) == 0) {
373 /* Look for file system superblocks, unless we only shall look for GPT partition tables */
374 blkid_probe_enable_superblocks(b, 1);
375 blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE|BLKID_SUBLKS_USAGE);
376 }
377
8c1be37e
LP		 378 blkid_probe_enable_partitions(b, 1);
379 blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
380
381 errno = 0;
382 r = blkid_do_safeprobe(b);
59ba6d0c
LP		 383 if (IN_SET(r, -2, 1))
384 return log_debug_errno(SYNTHETIC_ERRNO(ENOPKG), "Failed to identify any partition table.");
b382db9f 385 if (r != 0)
66855de7 386 return errno_or_else(EIO);
8c1be37e
LP		 387
388 m = new0(DissectedImage, 1);
389 if (!m)
390 return -ENOMEM;
391
b887c8b8
ZJS		 392 r = sd_device_new_from_devnum(&d, 'b', st.st_rdev);
393 if (r < 0)
394 return r;
395
e7cbe5cb
LB		 396 if ((!(flags & DISSECT_IMAGE_GPT_ONLY) &&
397 (flags & DISSECT_IMAGE_REQUIRE_ROOT)) ||
398 (flags & DISSECT_IMAGE_NO_PARTITION_TABLE)) {
9b6deb03 399 const char *usage = NULL;
8c1be37e 400
9b6deb03
LP		 401 (void) blkid_probe_lookup_value(b, "USAGE", &usage, NULL);
402 if (STRPTR_IN_SET(usage, "filesystem", "crypto")) {
403 _cleanup_free_ char *t = NULL, *n = NULL;
404 const char *fstype = NULL;
8c1be37e 405
9b6deb03
LP		 406 /* OK, we have found a file system, that's our root partition then. */
407 (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
8c1be37e 408
9b6deb03
LP		 409 if (fstype) {
410 t = strdup(fstype);
411 if (!t)
412 return -ENOMEM;
413 }
414
54b22b26
LP		 415 r = device_path_make_major_minor(st.st_mode, st.st_rdev, &n);
416 if (r < 0)
417 return r;
8c1be37e 418
e7cbe5cb
LB		 419 m->single_file_system = true;
420 m->verity = root_hash && verity_data;
421 m->can_verity = !!verity_data;
422
9b6deb03
LP		 423 m->partitions[PARTITION_ROOT] = (DissectedPartition) {
424 .found = true,
e7cbe5cb 425 .rw = !m->verity,
9b6deb03
LP		 426 .partno = -1,
427 .architecture = _ARCHITECTURE_INVALID,
1cc6c93a
YW		 428 .fstype = TAKE_PTR(t),
429 .node = TAKE_PTR(n),
9b6deb03 430 };
8c1be37e 431
4db1879a 432 m->encrypted = streq_ptr(fstype, "crypto_LUKS");
18b5886e 433
b1806441
LB		 434 /* Even on a single partition we need to wait for udev to create the
435 * /dev/block/X:Y symlink to /dev/loopZ */
436 r = loop_wait_for_partitions_to_appear(fd, d, 0, flags, &e);
437 if (r < 0)
438 return r;
1cc6c93a 439 *ret = TAKE_PTR(m);
8c1be37e 440
9b6deb03
LP		 441 return 0;
442 }
8c1be37e
LP		 443 }
444
445 (void) blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL);
446 if (!pttype)
447 return -ENOPKG;
448
449 is_gpt = streq_ptr(pttype, "gpt");
450 is_mbr = streq_ptr(pttype, "dos");
451
9b6deb03 452 if (!is_gpt && ((flags & DISSECT_IMAGE_GPT_ONLY) || !is_mbr))
8c1be37e
LP		 453 return -ENOPKG;
454
455 errno = 0;
456 pl = blkid_probe_get_partitions(b);
b382db9f 457 if (!pl)
66855de7 458 return errno_or_else(ENOMEM);
8c1be37e 459
052eaf5c 460 r = loop_wait_for_partitions_to_appear(fd, d, blkid_partlist_numof_partitions(pl), flags, &e);
ea887be0
ZJS		 461 if (r < 0)
462 return r;
8c1be37e 463
8437c059 464 FOREACH_DEVICE(e, q) {
9b6deb03 465 unsigned long long pflags;
8c1be37e 466 blkid_partition pp;
cde942f6 467 const char *node;
8c1be37e
LP		 468 dev_t qn;
469 int nr;
470
3c1f2cee
YW		 471 r = sd_device_get_devnum(q, &qn);
472 if (r < 0)
8c1be37e
LP		 473 continue;
474
475 if (st.st_rdev == qn)
476 continue;
477
aae22eb3
LP		 478 if (!device_is_block(q))
479 continue;
480
cde942f6 481 if (device_is_mmc_special_partition(q))
7be1420f
LP		 482 continue;
483
3c1f2cee
YW		 484 r = sd_device_get_devname(q, &node);
485 if (r < 0)
8c1be37e
LP		 486 continue;
487
488 pp = blkid_partlist_devno_to_partition(pl, qn);
489 if (!pp)
490 continue;
491
9b6deb03 492 pflags = blkid_partition_get_flags(pp);
8c1be37e
LP		 493
494 nr = blkid_partition_get_partno(pp);
495 if (nr < 0)
496 continue;
497
498 if (is_gpt) {
499 int designator = _PARTITION_DESIGNATOR_INVALID, architecture = _ARCHITECTURE_INVALID;
4623e8e6
LP		 500 const char *stype, *sid, *fstype = NULL;
501 sd_id128_t type_id, id;
8c1be37e
LP		 502 bool rw = true;
503
4623e8e6
LP		 504 sid = blkid_partition_get_uuid(pp);
505 if (!sid)
506 continue;
507 if (sd_id128_from_string(sid, &id) < 0)
508 continue;
509
8c1be37e
LP		 510 stype = blkid_partition_get_type_string(pp);
511 if (!stype)
512 continue;
8c1be37e
LP		 513 if (sd_id128_from_string(stype, &type_id) < 0)
514 continue;
515
516 if (sd_id128_equal(type_id, GPT_HOME)) {
a48dd347 517
0f7c9a3d
LP		 518 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
519
a48dd347
LP		 520 if (pflags & GPT_FLAG_NO_AUTO)
521 continue;
522
8c1be37e 523 designator = PARTITION_HOME;
9b6deb03 524 rw = !(pflags & GPT_FLAG_READ_ONLY);
8c1be37e 525 } else if (sd_id128_equal(type_id, GPT_SRV)) {
a48dd347 526
0f7c9a3d
LP		 527 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
528
a48dd347
LP		 529 if (pflags & GPT_FLAG_NO_AUTO)
530 continue;
531
8c1be37e 532 designator = PARTITION_SRV;
9b6deb03 533 rw = !(pflags & GPT_FLAG_READ_ONLY);
8c1be37e 534 } else if (sd_id128_equal(type_id, GPT_ESP)) {
a48dd347
LP		 535
536 /* Note that we don't check the GPT_FLAG_NO_AUTO flag for the ESP, as it is not defined
537 * there. We instead check the GPT_FLAG_NO_BLOCK_IO_PROTOCOL, as recommended by the
538 * UEFI spec (See "12.3.3 Number and Location of System Partitions"). */
539
540 if (pflags & GPT_FLAG_NO_BLOCK_IO_PROTOCOL)
541 continue;
542
8c1be37e
LP		 543 designator = PARTITION_ESP;
544 fstype = "vfat";
a8c47660
LP		 545
546 } else if (sd_id128_equal(type_id, GPT_XBOOTLDR)) {
547
0f7c9a3d
LP		 548 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
549
a8c47660
LP		 550 if (pflags & GPT_FLAG_NO_AUTO)
551 continue;
552
553 designator = PARTITION_XBOOTLDR;
554 rw = !(pflags & GPT_FLAG_READ_ONLY);
8c1be37e
LP		 555 }
556#ifdef GPT_ROOT_NATIVE
557 else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) {
4623e8e6 558
0f7c9a3d
LP		 559 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
560
a48dd347
LP		 561 if (pflags & GPT_FLAG_NO_AUTO)
562 continue;
563
4623e8e6
LP		 564 /* If a root ID is specified, ignore everything but the root id */
565 if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id))
566 continue;
567
8c1be37e
LP		 568 designator = PARTITION_ROOT;
569 architecture = native_architecture();
9b6deb03 570 rw = !(pflags & GPT_FLAG_READ_ONLY);
4f8b86e3 571 } else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE_VERITY)) {
4623e8e6 572
0f7c9a3d
LP		 573 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
574
a48dd347
LP		 575 if (pflags & GPT_FLAG_NO_AUTO)
576 continue;
577
4623e8e6
LP		 578 m->can_verity = true;
579
580 /* Ignore verity unless a root hash is specified */
581 if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id))
582 continue;
583
584 designator = PARTITION_ROOT_VERITY;
585 fstype = "DM_verity_hash";
586 architecture = native_architecture();
587 rw = false;
588 }
589#endif
8c1be37e
LP		 590#ifdef GPT_ROOT_SECONDARY
591 else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) {
4623e8e6 592
0f7c9a3d
LP		 593 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
594
a48dd347
LP		 595 if (pflags & GPT_FLAG_NO_AUTO)
596 continue;
597
4623e8e6
LP		 598 /* If a root ID is specified, ignore everything but the root id */
599 if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id))
600 continue;
601
8c1be37e
LP		 602 designator = PARTITION_ROOT_SECONDARY;
603 architecture = SECONDARY_ARCHITECTURE;
9b6deb03 604 rw = !(pflags & GPT_FLAG_READ_ONLY);
4f8b86e3 605 } else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY_VERITY)) {
a48dd347 606
0f7c9a3d
LP		 607 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
608
a48dd347
LP		 609 if (pflags & GPT_FLAG_NO_AUTO)
610 continue;
611
4623e8e6
LP		 612 m->can_verity = true;
613
614 /* Ignore verity unless root has is specified */
615 if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id))
616 continue;
617
618 designator = PARTITION_ROOT_SECONDARY_VERITY;
619 fstype = "DM_verity_hash";
620 architecture = SECONDARY_ARCHITECTURE;
621 rw = false;
622 }
8c1be37e
LP		 623#endif
624 else if (sd_id128_equal(type_id, GPT_SWAP)) {
a48dd347 625
0f7c9a3d
LP		 626 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO);
627
a48dd347
LP		 628 if (pflags & GPT_FLAG_NO_AUTO)
629 continue;
630
8c1be37e
LP		 631 designator = PARTITION_SWAP;
632 fstype = "swap";
633 } else if (sd_id128_equal(type_id, GPT_LINUX_GENERIC)) {
634
0f7c9a3d
LP		 635 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
636
a48dd347
LP		 637 if (pflags & GPT_FLAG_NO_AUTO)
638 continue;
639
8c1be37e
LP		 640 if (generic_node)
641 multiple_generic = true;
642 else {
643 generic_nr = nr;
9b6deb03 644 generic_rw = !(pflags & GPT_FLAG_READ_ONLY);
be30ad41 645 generic_uuid = id;
8c1be37e
LP		 646 generic_node = strdup(node);
647 if (!generic_node)
648 return -ENOMEM;
649 }
d4dffb85
LP		 650
651 } else if (sd_id128_equal(type_id, GPT_TMP)) {
652
0f7c9a3d
LP		 653 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
654
d4dffb85
LP		 655 if (pflags & GPT_FLAG_NO_AUTO)
656 continue;
657
658 designator = PARTITION_TMP;
659 rw = !(pflags & GPT_FLAG_READ_ONLY);
660
661 } else if (sd_id128_equal(type_id, GPT_VAR)) {
662
0f7c9a3d
LP		 663 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
664
d4dffb85
LP		 665 if (pflags & GPT_FLAG_NO_AUTO)
666 continue;
667
668 if (!FLAGS_SET(flags, DISSECT_IMAGE_RELAX_VAR_CHECK)) {
669 sd_id128_t var_uuid;
670
671 /* For /var we insist that the uuid of the partition matches the
672 * HMAC-SHA256 of the /var GPT partition type uuid, keyed by machine
673 * ID. Why? Unlike the other partitions /var is inherently
674 * installation specific, hence we need to be careful not to mount it
675 * in the wrong installation. By hashing the partition UUID from
676 * /etc/machine-id we can securely bind the partition to the
677 * installation. */
678
679 r = sd_id128_get_machine_app_specific(GPT_VAR, &var_uuid);
680 if (r < 0)
681 return r;
682
683 if (!sd_id128_equal(var_uuid, id)) {
684 log_debug("Found a /var/ partition, but its UUID didn't match our expectations, ignoring.");
685 continue;
686 }
687 }
688
689 designator = PARTITION_VAR;
690 rw = !(pflags & GPT_FLAG_READ_ONLY);
8c1be37e
LP		 691 }
692
693 if (designator != _PARTITION_DESIGNATOR_INVALID) {
694 _cleanup_free_ char *t = NULL, *n = NULL;
695
696 /* First one wins */
697 if (m->partitions[designator].found)
698 continue;
699
700 if (fstype) {
701 t = strdup(fstype);
702 if (!t)
703 return -ENOMEM;
704 }
705
706 n = strdup(node);
707 if (!n)
708 return -ENOMEM;
709
710 m->partitions[designator] = (DissectedPartition) {
711 .found = true,
712 .partno = nr,
713 .rw = rw,
714 .architecture = architecture,
1cc6c93a
YW		 715 .node = TAKE_PTR(n),
716 .fstype = TAKE_PTR(t),
be30ad41 717 .uuid = id,
8c1be37e 718 };
8c1be37e
LP		 719 }
720
721 } else if (is_mbr) {
722
a8c47660 723 switch (blkid_partition_get_type(pp)) {
8c1be37e 724
a8c47660
LP		 725 case 0x83: /* Linux partition */
726
727 if (pflags != 0x80) /* Bootable flag */
728 continue;
8c1be37e 729
a8c47660
LP		 730 if (generic_node)
731 multiple_generic = true;
732 else {
733 generic_nr = nr;
734 generic_rw = true;
735 generic_node = strdup(node);
736 if (!generic_node)
737 return -ENOMEM;
738 }
739
740 break;
741
742 case 0xEA: { /* Boot Loader Spec extended $BOOT partition */
743 _cleanup_free_ char *n = NULL;
744 sd_id128_t id = SD_ID128_NULL;
745 const char *sid;
746
747 /* First one wins */
748 if (m->partitions[PARTITION_XBOOTLDR].found)
749 continue;
750
751 sid = blkid_partition_get_uuid(pp);
752 if (sid)
753 (void) sd_id128_from_string(sid, &id);
754
755 n = strdup(node);
756 if (!n)
8c1be37e 757 return -ENOMEM;
a8c47660
LP		 758
759 m->partitions[PARTITION_XBOOTLDR] = (DissectedPartition) {
760 .found = true,
761 .partno = nr,
762 .rw = true,
763 .architecture = _ARCHITECTURE_INVALID,
764 .node = TAKE_PTR(n),
765 .uuid = id,
766 };
767
768 break;
769 }}
8c1be37e
LP		 770 }
771 }
772
773 if (!m->partitions[PARTITION_ROOT].found) {
774 /* No root partition found? Then let's see if ther's one for the secondary architecture. And if not
775 * either, then check if there's a single generic one, and use that. */
776
4623e8e6 777 if (m->partitions[PARTITION_ROOT_VERITY].found)
e0f9e7bd 778 return -EADDRNOTAVAIL;
4623e8e6 779
8c1be37e
LP		 780 if (m->partitions[PARTITION_ROOT_SECONDARY].found) {
781 m->partitions[PARTITION_ROOT] = m->partitions[PARTITION_ROOT_SECONDARY];
782 zero(m->partitions[PARTITION_ROOT_SECONDARY]);
4623e8e6
LP		 783
784 m->partitions[PARTITION_ROOT_VERITY] = m->partitions[PARTITION_ROOT_SECONDARY_VERITY];
785 zero(m->partitions[PARTITION_ROOT_SECONDARY_VERITY]);
786
e0f9e7bd
LP		 787 } else if (flags & DISSECT_IMAGE_REQUIRE_ROOT) {
788
789 /* If the root has was set, then we won't fallback to a generic node, because the root hash
790 * decides */
791 if (root_hash)
792 return -EADDRNOTAVAIL;
8c1be37e 793
e0f9e7bd
LP		 794 /* If we didn't find a generic node, then we can't fix this up either */
795 if (!generic_node)
796 return -ENXIO;
797
798 /* If we didn't find a properly marked root partition, but we did find a single suitable
799 * generic Linux partition, then use this as root partition, if the caller asked for it. */
8c1be37e
LP		 800 if (multiple_generic)
801 return -ENOTUNIQ;
802
803 m->partitions[PARTITION_ROOT] = (DissectedPartition) {
804 .found = true,
805 .rw = generic_rw,
806 .partno = generic_nr,
807 .architecture = _ARCHITECTURE_INVALID,
1cc6c93a 808 .node = TAKE_PTR(generic_node),
be30ad41 809 .uuid = generic_uuid,
8c1be37e 810 };
e0f9e7bd 811 }
8c1be37e
LP		 812 }
813
4623e8e6 814 if (root_hash) {
e0f9e7bd 815 if (!m->partitions[PARTITION_ROOT_VERITY].found || !m->partitions[PARTITION_ROOT].found)
4623e8e6
LP		 816 return -EADDRNOTAVAIL;
817
818 /* If we found the primary root with the hash, then we definitely want to suppress any secondary root
819 * (which would be weird, after all the root hash should only be assigned to one pair of
820 * partitions... */
821 m->partitions[PARTITION_ROOT_SECONDARY].found = false;
822 m->partitions[PARTITION_ROOT_SECONDARY_VERITY].found = false;
823
824 /* If we found a verity setup, then the root partition is necessarily read-only. */
825 m->partitions[PARTITION_ROOT].rw = false;
826
827 m->verity = true;
828 }
829
18b5886e
LP		 830 blkid_free_probe(b);
831 b = NULL;
832
8c1be37e
LP		 833 /* Fill in file system types if we don't know them yet. */
834 for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
18b5886e 835 DissectedPartition *p = m->partitions + i;
8c1be37e 836
18b5886e 837 if (!p->found)
8c1be37e
LP		 838 continue;
839
18b5886e
LP		 840 if (!p->fstype && p->node) {
841 r = probe_filesystem(p->node, &p->fstype);
7cc84b2c 842 if (r < 0 && r != -EUCLEAN)
18b5886e 843 return r;
8c1be37e
LP		 844 }
845
18b5886e
LP		 846 if (streq_ptr(p->fstype, "crypto_LUKS"))
847 m->encrypted = true;
896f937f
LP		 848
849 if (p->fstype && fstype_is_ro(p->fstype))
850 p->rw = false;
8c1be37e
LP		 851 }
852
1cc6c93a 853 *ret = TAKE_PTR(m);
8c1be37e
LP		 854
855 return 0;
856#else
857 return -EOPNOTSUPP;
858#endif
859}
860
861DissectedImage* dissected_image_unref(DissectedImage *m) {
862 unsigned i;
863
864 if (!m)
865 return NULL;
866
867 for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
868 free(m->partitions[i].fstype);
869 free(m->partitions[i].node);
18b5886e
LP		 870 free(m->partitions[i].decrypted_fstype);
871 free(m->partitions[i].decrypted_node);
8c1be37e
LP		 872 }
873
3b925504
LP		 874 free(m->hostname);
875 strv_free(m->machine_info);
876 strv_free(m->os_release);
877
5fecf46d 878 return mfree(m);
8c1be37e
LP		 879}
880
18b5886e 881static int is_loop_device(const char *path) {
553e15f2 882 char s[SYS_BLOCK_PATH_MAX("/../loop/")];
18b5886e
LP		 883 struct stat st;
884
885 assert(path);
886
887 if (stat(path, &st) < 0)
888 return -errno;
889
890 if (!S_ISBLK(st.st_mode))
891 return -ENOTBLK;
892
553e15f2 893 xsprintf_sys_block_path(s, "/loop/", st.st_dev);
18b5886e
LP		 894 if (access(s, F_OK) < 0) {
895 if (errno != ENOENT)
896 return -errno;
897
898 /* The device itself isn't a loop device, but maybe it's a partition and its parent is? */
553e15f2 899 xsprintf_sys_block_path(s, "/../loop/", st.st_dev);
18b5886e
LP		 900 if (access(s, F_OK) < 0)
901 return errno == ENOENT ? false : -errno;
902 }
903
904 return true;
905}
906
cf32c486
LP		 907static int run_fsck(const char *node, const char *fstype) {
908 int r, exit_status;
909 pid_t pid;
910
911 assert(node);
912 assert(fstype);
913
914 r = fsck_exists(fstype);
915 if (r < 0) {
916 log_debug_errno(r, "Couldn't determine whether fsck for %s exists, proceeding anyway.", fstype);
917 return 0;
918 }
919 if (r == 0) {
920 log_debug("Not checking partition %s, as fsck for %s does not exist.", node, fstype);
921 return 0;
922 }
923
924 r = safe_fork("(fsck)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_RLIMIT_NOFILE_SAFE|FORK_DEATHSIG|FORK_NULL_STDIO, &pid);
925 if (r < 0)
926 return log_debug_errno(r, "Failed to fork off fsck: %m");
927 if (r == 0) {
928 /* Child */
929 execl("/sbin/fsck", "/sbin/fsck", "-aT", node, NULL);
930 log_debug_errno(errno, "Failed to execl() fsck: %m");
931 _exit(FSCK_OPERATIONAL_ERROR);
932 }
933
934 exit_status = wait_for_terminate_and_check("fsck", pid, 0);
935 if (exit_status < 0)
936 return log_debug_errno(exit_status, "Failed to fork off /sbin/fsck: %m");
937
938 if ((exit_status & ~FSCK_ERROR_CORRECTED) != FSCK_SUCCESS) {
939 log_debug("fsck failed with exit status %i.", exit_status);
940
941 if ((exit_status & (FSCK_SYSTEM_SHOULD_REBOOT|FSCK_ERRORS_LEFT_UNCORRECTED)) != 0)
942 return log_debug_errno(SYNTHETIC_ERRNO(EUCLEAN), "File system is corrupted, refusing.");
943
944 log_debug("Ignoring fsck error.");
945 }
946
947 return 0;
948}
949
18b5886e
LP		 950static int mount_partition(
951 DissectedPartition *m,
952 const char *where,
953 const char *directory,
2d3a5a73 954 uid_t uid_shift,
18b5886e
LP		 955 DissectImageFlags flags) {
956
2d3a5a73
LP		 957 _cleanup_free_ char *chased = NULL, *options = NULL;
958 const char *p, *node, *fstype;
8c1be37e 959 bool rw;
2eedfd2d 960 int r;
8c1be37e
LP		 961
962 assert(m);
963 assert(where);
964
18b5886e
LP		 965 node = m->decrypted_node ?: m->node;
966 fstype = m->decrypted_fstype ?: m->fstype;
967
968 if (!m->found || !node || !fstype)
8c1be37e
LP		 969 return 0;
970
18b5886e
LP		 971 /* Stacked encryption? Yuck */
972 if (streq_ptr(fstype, "crypto_LUKS"))
973 return -ELOOP;
974
975 rw = m->rw && !(flags & DISSECT_IMAGE_READ_ONLY);
8c1be37e 976
cf32c486
LP		 977 if (FLAGS_SET(flags, DISSECT_IMAGE_FSCK) && rw) {
978 r = run_fsck(node, fstype);
979 if (r < 0)
980 return r;
981 }
982
2eedfd2d 983 if (directory) {
a5648b80 984 r = chase_symlinks(directory, where, CHASE_PREFIX_ROOT, &chased, NULL);
2eedfd2d
LP		 985 if (r < 0)
986 return r;
987
988 p = chased;
989 } else
8c1be37e
LP		 990 p = where;
991
18b5886e 992 /* If requested, turn on discard support. */
154d2269 993 if (fstype_can_discard(fstype) &&
18b5886e 994 ((flags & DISSECT_IMAGE_DISCARD) ||
2d3a5a73
LP		 995 ((flags & DISSECT_IMAGE_DISCARD_ON_LOOP) && is_loop_device(m->node)))) {
996 options = strdup("discard");
997 if (!options)
998 return -ENOMEM;
999 }
1000
1001 if (uid_is_valid(uid_shift) && uid_shift != 0 && fstype_can_uid_gid(fstype)) {
1002 _cleanup_free_ char *uid_option = NULL;
1003
1004 if (asprintf(&uid_option, "uid=" UID_FMT ",gid=" GID_FMT, uid_shift, (gid_t) uid_shift) < 0)
1005 return -ENOMEM;
1006
1007 if (!strextend_with_separator(&options, ",", uid_option, NULL))
1008 return -ENOMEM;
1009 }
8c1be37e 1010
d9223c07
LP		 1011 r = mount_verbose(LOG_DEBUG, node, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), options);
1012 if (r < 0)
1013 return r;
1014
1015 return 1;
8c1be37e
LP		 1016}
1017
2d3a5a73 1018int dissected_image_mount(DissectedImage *m, const char *where, uid_t uid_shift, DissectImageFlags flags) {
d9223c07 1019 int r, boot_mounted;
8c1be37e
LP		 1020
1021 assert(m);
1022 assert(where);
1023
1024 if (!m->partitions[PARTITION_ROOT].found)
1025 return -ENXIO;
1026
2d3a5a73
LP		 1027 if ((flags & DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY) == 0) {
1028 r = mount_partition(m->partitions + PARTITION_ROOT, where, NULL, uid_shift, flags);
1029 if (r < 0)
1030 return r;
03bcb6d4
LP		 1031
1032 if (flags & DISSECT_IMAGE_VALIDATE_OS) {
1033 r = path_is_os_tree(where);
1034 if (r < 0)
1035 return r;
1036 if (r == 0)
1037 return -EMEDIUMTYPE;
1038 }
2d3a5a73
LP		 1039 }
1040
705727fd 1041 if (flags & DISSECT_IMAGE_MOUNT_ROOT_ONLY)
2d3a5a73 1042 return 0;
8c1be37e 1043
2d3a5a73 1044 r = mount_partition(m->partitions + PARTITION_HOME, where, "/home", uid_shift, flags);
8c1be37e
LP		 1045 if (r < 0)
1046 return r;
1047
2d3a5a73 1048 r = mount_partition(m->partitions + PARTITION_SRV, where, "/srv", uid_shift, flags);
8c1be37e
LP		 1049 if (r < 0)
1050 return r;
1051
d4dffb85
LP		 1052 r = mount_partition(m->partitions + PARTITION_VAR, where, "/var", uid_shift, flags);
1053 if (r < 0)
1054 return r;
1055
1056 r = mount_partition(m->partitions + PARTITION_TMP, where, "/var/tmp", uid_shift, flags);
1057 if (r < 0)
1058 return r;
1059
d9223c07
LP		 1060 boot_mounted = mount_partition(m->partitions + PARTITION_XBOOTLDR, where, "/boot", uid_shift, flags);
1061 if (boot_mounted < 0)
1062 return boot_mounted;
1063
8c1be37e 1064 if (m->partitions[PARTITION_ESP].found) {
d9223c07
LP		 1065 /* Mount the ESP to /efi if it exists. If it doesn't exist, use /boot instead, but only if it
1066 * exists and is empty, and we didn't already mount the XBOOTLDR partition into it. */
8c1be37e 1067
a5648b80 1068 r = chase_symlinks("/efi", where, CHASE_PREFIX_ROOT, NULL, NULL);
d9223c07
LP		 1069 if (r >= 0) {
1070 r = mount_partition(m->partitions + PARTITION_ESP, where, "/efi", uid_shift, flags);
1071 if (r < 0)
1072 return r;
8c1be37e 1073
d9223c07 1074 } else if (boot_mounted <= 0) {
2eedfd2d
LP		 1075 _cleanup_free_ char *p = NULL;
1076
a5648b80 1077 r = chase_symlinks("/boot", where, CHASE_PREFIX_ROOT, &p, NULL);
d9223c07
LP		 1078 if (r >= 0 && dir_is_empty(p) > 0) {
1079 r = mount_partition(m->partitions + PARTITION_ESP, where, "/boot", uid_shift, flags);
2eedfd2d
LP		 1080 if (r < 0)
1081 return r;
1082 }
8c1be37e
LP		 1083 }
1084 }
1085
1086 return 0;
1087}
1088
349cc4a5 1089#if HAVE_LIBCRYPTSETUP
18b5886e
LP		 1090typedef struct DecryptedPartition {
1091 struct crypt_device *device;
1092 char *name;
1093 bool relinquished;
1094} DecryptedPartition;
1095
1096struct DecryptedImage {
1097 DecryptedPartition *decrypted;
1098 size_t n_decrypted;
1099 size_t n_allocated;
1100};
1101#endif
1102
1103DecryptedImage* decrypted_image_unref(DecryptedImage* d) {
349cc4a5 1104#if HAVE_LIBCRYPTSETUP
18b5886e
LP		 1105 size_t i;
1106 int r;
1107
1108 if (!d)
1109 return NULL;
1110
1111 for (i = 0; i < d->n_decrypted; i++) {
1112 DecryptedPartition *p = d->decrypted + i;
1113
1114 if (p->device && p->name && !p->relinquished) {
1115 r = crypt_deactivate(p->device, p->name);
1116 if (r < 0)
1117 log_debug_errno(r, "Failed to deactivate encrypted partition %s", p->name);
1118 }
1119
1120 if (p->device)
1121 crypt_free(p->device);
1122 free(p->name);
1123 }
1124
1125 free(d);
1126#endif
1127 return NULL;
1128}
1129
349cc4a5 1130#if HAVE_LIBCRYPTSETUP
4623e8e6
LP		 1131
1132static int make_dm_name_and_node(const void *original_node, const char *suffix, char **ret_name, char **ret_node) {
1133 _cleanup_free_ char *name = NULL, *node = NULL;
1134 const char *base;
1135
1136 assert(original_node);
1137 assert(suffix);
1138 assert(ret_name);
1139 assert(ret_node);
1140
1141 base = strrchr(original_node, '/');
1142 if (!base)
1143 return -EINVAL;
1144 base++;
1145 if (isempty(base))
1146 return -EINVAL;
1147
1148 name = strjoin(base, suffix);
1149 if (!name)
1150 return -ENOMEM;
1151 if (!filename_is_valid(name))
1152 return -EINVAL;
1153
657ee2d8 1154 node = path_join(crypt_get_dir(), name);
4623e8e6
LP		 1155 if (!node)
1156 return -ENOMEM;
1157
1cc6c93a
YW		 1158 *ret_name = TAKE_PTR(name);
1159 *ret_node = TAKE_PTR(node);
4623e8e6 1160
4623e8e6
LP		 1161 return 0;
1162}
1163
18b5886e
LP		 1164static int decrypt_partition(
1165 DissectedPartition *m,
1166 const char *passphrase,
1167 DissectImageFlags flags,
1168 DecryptedImage *d) {
1169
1170 _cleanup_free_ char *node = NULL, *name = NULL;
294bd454 1171 _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
18b5886e
LP		 1172 int r;
1173
1174 assert(m);
1175 assert(d);
1176
1177 if (!m->found || !m->node || !m->fstype)
1178 return 0;
1179
1180 if (!streq(m->fstype, "crypto_LUKS"))
1181 return 0;
1182
bdd73ac5
ZJS		 1183 if (!passphrase)
1184 return -ENOKEY;
1185
4623e8e6
LP		 1186 r = make_dm_name_and_node(m->node, "-decrypted", &name, &node);
1187 if (r < 0)
1188 return r;
18b5886e
LP		 1189
1190 if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1))
1191 return -ENOMEM;
1192
1193 r = crypt_init(&cd, m->node);
1194 if (r < 0)
715cbb81 1195 return log_debug_errno(r, "Failed to initialize dm-crypt: %m");
18b5886e 1196
1887032f
TM		 1197 crypt_set_log_callback(cd, cryptsetup_log_glue, NULL);
1198
dd59868b 1199 r = crypt_load(cd, CRYPT_LUKS, NULL);
294bd454
ZJS		 1200 if (r < 0)
1201 return log_debug_errno(r, "Failed to load LUKS metadata: %m");
18b5886e
LP		 1202
1203 r = crypt_activate_by_passphrase(cd, name, CRYPT_ANY_SLOT, passphrase, strlen(passphrase),
1204 ((flags & DISSECT_IMAGE_READ_ONLY) ? CRYPT_ACTIVATE_READONLY : 0) |
1205 ((flags & DISSECT_IMAGE_DISCARD_ON_CRYPTO) ? CRYPT_ACTIVATE_ALLOW_DISCARDS : 0));
294bd454 1206 if (r < 0) {
715cbb81 1207 log_debug_errno(r, "Failed to activate LUKS device: %m");
294bd454 1208 return r == -EPERM ? -EKEYREJECTED : r;
18b5886e 1209 }
18b5886e 1210
1cc6c93a
YW		 1211 d->decrypted[d->n_decrypted].name = TAKE_PTR(name);
1212 d->decrypted[d->n_decrypted].device = TAKE_PTR(cd);
18b5886e
LP		 1213 d->n_decrypted++;
1214
1cc6c93a 1215 m->decrypted_node = TAKE_PTR(node);
18b5886e
LP		 1216
1217 return 0;
4623e8e6
LP		 1218}
1219
1220static int verity_partition(
1221 DissectedPartition *m,
1222 DissectedPartition *v,
1223 const void *root_hash,
1224 size_t root_hash_size,
e7cbe5cb 1225 const char *verity_data,
4623e8e6
LP		 1226 DissectImageFlags flags,
1227 DecryptedImage *d) {
1228
1229 _cleanup_free_ char *node = NULL, *name = NULL;
294bd454 1230 _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
4623e8e6
LP		 1231 int r;
1232
1233 assert(m);
e7cbe5cb 1234 assert(v || verity_data);
4623e8e6
LP		 1235
1236 if (!root_hash)
1237 return 0;
1238
1239 if (!m->found || !m->node || !m->fstype)
1240 return 0;
e7cbe5cb
LB		 1241 if (!verity_data) {
1242 if (!v->found || !v->node || !v->fstype)
1243 return 0;
4623e8e6 1244
e7cbe5cb
LB		 1245 if (!streq(v->fstype, "DM_verity_hash"))
1246 return 0;
1247 }
4623e8e6
LP		 1248
1249 r = make_dm_name_and_node(m->node, "-verity", &name, &node);
1250 if (r < 0)
1251 return r;
1252
1253 if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1))
1254 return -ENOMEM;
1255
e7cbe5cb 1256 r = crypt_init(&cd, verity_data ?: v->node);
4623e8e6
LP		 1257 if (r < 0)
1258 return r;
1259
1887032f
TM		 1260 crypt_set_log_callback(cd, cryptsetup_log_glue, NULL);
1261
4623e8e6
LP		 1262 r = crypt_load(cd, CRYPT_VERITY, NULL);
1263 if (r < 0)
294bd454 1264 return r;
4623e8e6
LP		 1265
1266 r = crypt_set_data_device(cd, m->node);
1267 if (r < 0)
294bd454 1268 return r;
4623e8e6
LP		 1269
1270 r = crypt_activate_by_volume_key(cd, name, root_hash, root_hash_size, CRYPT_ACTIVATE_READONLY);
1271 if (r < 0)
294bd454 1272 return r;
4623e8e6 1273
1cc6c93a
YW		 1274 d->decrypted[d->n_decrypted].name = TAKE_PTR(name);
1275 d->decrypted[d->n_decrypted].device = TAKE_PTR(cd);
4623e8e6
LP		 1276 d->n_decrypted++;
1277
1cc6c93a 1278 m->decrypted_node = TAKE_PTR(node);
4623e8e6
LP		 1279
1280 return 0;
18b5886e
LP		 1281}
1282#endif
1283
1284int dissected_image_decrypt(
1285 DissectedImage *m,
1286 const char *passphrase,
4623e8e6
LP		 1287 const void *root_hash,
1288 size_t root_hash_size,
e7cbe5cb 1289 const char *verity_data,
18b5886e
LP		 1290 DissectImageFlags flags,
1291 DecryptedImage **ret) {
1292
349cc4a5 1293#if HAVE_LIBCRYPTSETUP
49b5b3b4 1294 _cleanup_(decrypted_image_unrefp) DecryptedImage *d = NULL;
18b5886e
LP		 1295 unsigned i;
1296 int r;
1297#endif
1298
1299 assert(m);
4623e8e6 1300 assert(root_hash || root_hash_size == 0);
18b5886e
LP		 1301
1302 /* Returns:
1303 *
1304 * = 0 → There was nothing to decrypt
1305 * > 0 → Decrypted successfully
d1c536f5 1306 * -ENOKEY → There's something to decrypt but no key was supplied
18b5886e
LP		 1307 * -EKEYREJECTED → Passed key was not correct
1308 */
1309
4623e8e6
LP		 1310 if (root_hash && root_hash_size < sizeof(sd_id128_t))
1311 return -EINVAL;
1312
1313 if (!m->encrypted && !m->verity) {
18b5886e
LP		 1314 *ret = NULL;
1315 return 0;
1316 }
1317
349cc4a5 1318#if HAVE_LIBCRYPTSETUP
18b5886e
LP		 1319 d = new0(DecryptedImage, 1);
1320 if (!d)
1321 return -ENOMEM;
1322
1323 for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
1324 DissectedPartition *p = m->partitions + i;
4623e8e6 1325 int k;
18b5886e
LP		 1326
1327 if (!p->found)
1328 continue;
1329
1330 r = decrypt_partition(p, passphrase, flags, d);
1331 if (r < 0)
1332 return r;
1333
4623e8e6
LP		 1334 k = PARTITION_VERITY_OF(i);
1335 if (k >= 0) {
e7cbe5cb 1336 r = verity_partition(p, m->partitions + k, root_hash, root_hash_size, verity_data, flags, d);
4623e8e6
LP		 1337 if (r < 0)
1338 return r;
1339 }
1340
18b5886e
LP		 1341 if (!p->decrypted_fstype && p->decrypted_node) {
1342 r = probe_filesystem(p->decrypted_node, &p->decrypted_fstype);
7cc84b2c 1343 if (r < 0 && r != -EUCLEAN)
18b5886e
LP		 1344 return r;
1345 }
1346 }
1347
1cc6c93a 1348 *ret = TAKE_PTR(d);
18b5886e
LP		 1349
1350 return 1;
1351#else
1352 return -EOPNOTSUPP;
1353#endif
1354}
1355
1356int dissected_image_decrypt_interactively(
1357 DissectedImage *m,
1358 const char *passphrase,
4623e8e6
LP		 1359 const void *root_hash,
1360 size_t root_hash_size,
e7cbe5cb 1361 const char *verity_data,
18b5886e
LP		 1362 DissectImageFlags flags,
1363 DecryptedImage **ret) {
1364
1365 _cleanup_strv_free_erase_ char **z = NULL;
1366 int n = 3, r;
1367
1368 if (passphrase)
1369 n--;
1370
1371 for (;;) {
e7cbe5cb 1372 r = dissected_image_decrypt(m, passphrase, root_hash, root_hash_size, verity_data, flags, ret);
18b5886e
LP		 1373 if (r >= 0)
1374 return r;
1375 if (r == -EKEYREJECTED)
1376 log_error_errno(r, "Incorrect passphrase, try again!");
fc95c359
YW		 1377 else if (r != -ENOKEY)
1378 return log_error_errno(r, "Failed to decrypt image: %m");
18b5886e 1379
baaa35ad
ZJS		 1380 if (--n < 0)
1381 return log_error_errno(SYNTHETIC_ERRNO(EKEYREJECTED),
1382 "Too many retries.");
18b5886e
LP		 1383
1384 z = strv_free(z);
1385
a1c111c2 1386 r = ask_password_auto("Please enter image passphrase:", NULL, "dissect", "dissect", USEC_INFINITY, 0, &z);
18b5886e
LP		 1387 if (r < 0)
1388 return log_error_errno(r, "Failed to query for passphrase: %m");
1389
1390 passphrase = z[0];
1391 }
1392}
1393
18b5886e
LP		 1394int decrypted_image_relinquish(DecryptedImage *d) {
1395
349cc4a5 1396#if HAVE_LIBCRYPTSETUP
18b5886e
LP		 1397 size_t i;
1398 int r;
1399#endif
1400
1401 assert(d);
1402
1403 /* Turns on automatic removal after the last use ended for all DM devices of this image, and sets a boolean so
1404 * that we don't clean it up ourselves either anymore */
1405
349cc4a5 1406#if HAVE_LIBCRYPTSETUP
18b5886e
LP		 1407 for (i = 0; i < d->n_decrypted; i++) {
1408 DecryptedPartition *p = d->decrypted + i;
1409
1410 if (p->relinquished)
1411 continue;
1412
a709a315 1413 r = dm_deferred_remove(p->name);
18b5886e
LP		 1414 if (r < 0)
1415 return log_debug_errno(r, "Failed to mark %s for auto-removal: %m", p->name);
1416
1417 p->relinquished = true;
1418 }
1419#endif
1420
1421 return 0;
1422}
1423
e7cbe5cb
LB		 1424int verity_metadata_load(const char *image, void **ret_roothash, size_t *ret_roothash_size, char **ret_verity_data) {
1425 _cleanup_free_ char *verity_filename = NULL;
1426 _cleanup_free_ void *roothash_decoded = NULL;
1427 size_t roothash_decoded_size = 0;
78ebe980
LP		 1428 int r;
1429
1430 assert(image);
78ebe980
LP		 1431
1432 if (is_device_path(image)) {
1433 /* If we are asked to load the root hash for a device node, exit early */
e7cbe5cb
LB		 1434 if (ret_roothash)
1435 *ret_roothash = NULL;
1436 if (ret_roothash_size)
1437 *ret_roothash_size = 0;
1438 if (ret_verity_data)
1439 *ret_verity_data = NULL;
78ebe980
LP		 1440 return 0;
1441 }
1442
e7cbe5cb
LB		 1443 if (ret_verity_data) {
1444 char *e;
78ebe980 1445
e7cbe5cb
LB		 1446 verity_filename = new(char, strlen(image) + STRLEN(".verity") + 1);
1447 if (!verity_filename)
1448 return -ENOMEM;
1449 strcpy(verity_filename, image);
1450 e = endswith(verity_filename, ".raw");
41488e1f 1451 if (e)
e7cbe5cb
LB		 1452 strcpy(e, ".verity");
1453 else
1454 strcat(verity_filename, ".verity");
41488e1f 1455
e7cbe5cb
LB		 1456 r = access(verity_filename, F_OK);
1457 if (r < 0) {
1458 if (errno != ENOENT)
1459 return -errno;
1460 verity_filename = mfree(verity_filename);
41488e1f 1461 }
78ebe980 1462 }
78ebe980 1463
e7cbe5cb
LB		 1464 if (ret_roothash) {
1465 _cleanup_free_ char *text = NULL;
1466 assert(ret_roothash_size);
1467
1468 r = getxattr_malloc(image, "user.verity.roothash", &text, true);
1469 if (r < 0) {
1470 char *fn, *e, *n;
1471
1472 if (!IN_SET(r, -ENODATA, -EOPNOTSUPP, -ENOENT))
1473 return r;
78ebe980 1474
e7cbe5cb
LB		 1475 fn = newa(char, strlen(image) + STRLEN(".roothash") + 1);
1476 n = stpcpy(fn, image);
1477 e = endswith(fn, ".raw");
1478 if (e)
1479 n = e;
1480
1481 strcpy(n, ".roothash");
1482
1483 r = read_one_line_file(fn, &text);
1484 if (r < 0 && r != -ENOENT)
1485 return r;
1486 }
1487
1488 if (text) {
1489 r = unhexmem(text, strlen(text), &roothash_decoded, &roothash_decoded_size);
1490 if (r < 0)
1491 return r;
1492 if (roothash_decoded_size < sizeof(sd_id128_t))
1493 return -EINVAL;
1494 }
1495 }
1496
1497 if (ret_roothash) {
1498 *ret_roothash = TAKE_PTR(roothash_decoded);
1499 *ret_roothash_size = roothash_decoded_size;
1500 }
1501 if (ret_verity_data)
1502 *ret_verity_data = TAKE_PTR(verity_filename);
78ebe980 1503
78ebe980
LP		 1504 return 1;
1505}
1506
3b925504
LP		 1507int dissected_image_acquire_metadata(DissectedImage *m) {
1508
1509 enum {
1510 META_HOSTNAME,
1511 META_MACHINE_ID,
1512 META_MACHINE_INFO,
1513 META_OS_RELEASE,
1514 _META_MAX,
1515 };
1516
1517 static const char *const paths[_META_MAX] = {
1518 [META_HOSTNAME] = "/etc/hostname\0",
1519 [META_MACHINE_ID] = "/etc/machine-id\0",
1520 [META_MACHINE_INFO] = "/etc/machine-info\0",
d4dffb85
LP		 1521 [META_OS_RELEASE] = "/etc/os-release\0"
1522 "/usr/lib/os-release\0",
3b925504
LP		 1523 };
1524
1525 _cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL;
1526 _cleanup_(rmdir_and_freep) char *t = NULL;
1527 _cleanup_(sigkill_waitp) pid_t child = 0;
1528 sd_id128_t machine_id = SD_ID128_NULL;
1529 _cleanup_free_ char *hostname = NULL;
1530 unsigned n_meta_initialized = 0, k;
1531 int fds[2 * _META_MAX], r;
3b925504
LP		 1532
1533 BLOCK_SIGNALS(SIGCHLD);
1534
1535 assert(m);
1536
1537 for (; n_meta_initialized < _META_MAX; n_meta_initialized ++)
1538 if (pipe2(fds + 2*n_meta_initialized, O_CLOEXEC) < 0) {
1539 r = -errno;
1540 goto finish;
1541 }
1542
1543 r = mkdtemp_malloc("/tmp/dissect-XXXXXX", &t);
1544 if (r < 0)
1545 goto finish;
1546
e2047ba9 1547 r = safe_fork("(sd-dissect)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_NEW_MOUNTNS|FORK_MOUNTNS_SLAVE, &child);
be39f6ee 1548 if (r < 0)
3b925504 1549 goto finish;
be39f6ee 1550 if (r == 0) {
03bcb6d4 1551 r = dissected_image_mount(m, t, UID_INVALID, DISSECT_IMAGE_READ_ONLY|DISSECT_IMAGE_MOUNT_ROOT_ONLY|DISSECT_IMAGE_VALIDATE_OS);
429d4e41
LP		 1552 if (r < 0) {
1553 log_debug_errno(r, "Failed to mount dissected image: %m");
3b925504 1554 _exit(EXIT_FAILURE);
429d4e41 1555 }
3b925504
LP		 1556
1557 for (k = 0; k < _META_MAX; k++) {
1558 _cleanup_close_ int fd = -1;
1559 const char *p;
1560
1561 fds[2*k] = safe_close(fds[2*k]);
1562
1563 NULSTR_FOREACH(p, paths[k]) {
36952d19 1564 fd = chase_symlinks_and_open(p, t, CHASE_PREFIX_ROOT, O_RDONLY|O_CLOEXEC|O_NOCTTY, NULL);
3b925504
LP		 1565 if (fd >= 0)
1566 break;
1567 }
36952d19
LP		 1568 if (fd < 0) {
1569 log_debug_errno(fd, "Failed to read %s file of image, ignoring: %m", paths[k]);
3b925504 1570 continue;
36952d19 1571 }
3b925504
LP		 1572
1573 r = copy_bytes(fd, fds[2*k+1], (uint64_t) -1, 0);
1574 if (r < 0)
1575 _exit(EXIT_FAILURE);
1576
1577 fds[2*k+1] = safe_close(fds[2*k+1]);
1578 }
1579
1580 _exit(EXIT_SUCCESS);
1581 }
1582
1583 for (k = 0; k < _META_MAX; k++) {
1584 _cleanup_fclose_ FILE *f = NULL;
1585
1586 fds[2*k+1] = safe_close(fds[2*k+1]);
1587
4fa744a3 1588 f = take_fdopen(&fds[2*k], "r");
3b925504
LP		 1589 if (!f) {
1590 r = -errno;
1591 goto finish;
1592 }
1593
3b925504
LP		 1594 switch (k) {
1595
1596 case META_HOSTNAME:
1597 r = read_etc_hostname_stream(f, &hostname);
1598 if (r < 0)
1599 log_debug_errno(r, "Failed to read /etc/hostname: %m");
1600
1601 break;
1602
1603 case META_MACHINE_ID: {
1604 _cleanup_free_ char *line = NULL;
1605
1606 r = read_line(f, LONG_LINE_MAX, &line);
1607 if (r < 0)
1608 log_debug_errno(r, "Failed to read /etc/machine-id: %m");
1609 else if (r == 33) {
1610 r = sd_id128_from_string(line, &machine_id);
1611 if (r < 0)
1612 log_debug_errno(r, "Image contains invalid /etc/machine-id: %s", line);
1613 } else if (r == 0)
1614 log_debug("/etc/machine-id file is empty.");
1615 else
1616 log_debug("/etc/machine-id has unexpected length %i.", r);
1617
1618 break;
1619 }
1620
1621 case META_MACHINE_INFO:
aa8fbc74 1622 r = load_env_file_pairs(f, "machine-info", &machine_info);
3b925504
LP		 1623 if (r < 0)
1624 log_debug_errno(r, "Failed to read /etc/machine-info: %m");
1625
1626 break;
1627
1628 case META_OS_RELEASE:
aa8fbc74 1629 r = load_env_file_pairs(f, "os-release", &os_release);
3b925504
LP		 1630 if (r < 0)
1631 log_debug_errno(r, "Failed to read OS release file: %m");
1632
1633 break;
1634 }
1635 }
1636
2e87a1fd 1637 r = wait_for_terminate_and_check("(sd-dissect)", child, 0);
3b925504 1638 child = 0;
2e87a1fd 1639 if (r < 0)
3b925504 1640 goto finish;
2e87a1fd
LP		 1641 if (r != EXIT_SUCCESS)
1642 return -EPROTO;
3b925504
LP		 1643
1644 free_and_replace(m->hostname, hostname);
1645 m->machine_id = machine_id;
1646 strv_free_and_replace(m->machine_info, machine_info);
1647 strv_free_and_replace(m->os_release, os_release);
1648
1649finish:
1650 for (k = 0; k < n_meta_initialized; k++)
1651 safe_close_pair(fds + 2*k);
1652
1653 return r;
1654}
1655
4526113f
LP		 1656int dissect_image_and_warn(
1657 int fd,
1658 const char *name,
1659 const void *root_hash,
1660 size_t root_hash_size,
e7cbe5cb 1661 const char *verity_data,
4526113f
LP		 1662 DissectImageFlags flags,
1663 DissectedImage **ret) {
1664
1665 _cleanup_free_ char *buffer = NULL;
1666 int r;
1667
1668 if (!name) {
1669 r = fd_get_path(fd, &buffer);
1670 if (r < 0)
1671 return r;
1672
1673 name = buffer;
1674 }
1675
e7cbe5cb 1676 r = dissect_image(fd, root_hash, root_hash_size, verity_data, flags, ret);
4526113f
LP		 1677
1678 switch (r) {
1679
1680 case -EOPNOTSUPP:
1681 return log_error_errno(r, "Dissecting images is not supported, compiled without blkid support.");
1682
1683 case -ENOPKG:
1684 return log_error_errno(r, "Couldn't identify a suitable partition table or file system in '%s'.", name);
1685
1686 case -EADDRNOTAVAIL:
1687 return log_error_errno(r, "No root partition for specified root hash found in '%s'.", name);
1688
1689 case -ENOTUNIQ:
1690 return log_error_errno(r, "Multiple suitable root partitions found in image '%s'.", name);
1691
1692 case -ENXIO:
1693 return log_error_errno(r, "No suitable root partition found in image '%s'.", name);
1694
1695 case -EPROTONOSUPPORT:
1696 return log_error_errno(r, "Device '%s' is loopback block device with partition scanning turned off, please turn it on.", name);
1697
1698 default:
1699 if (r < 0)
1700 return log_error_errno(r, "Failed to dissect image '%s': %m", name);
1701
1702 return r;
1703 }
1704}
1705
e7cbe5cb
LB		 1706bool dissected_image_can_do_verity(const DissectedImage *image, unsigned partition_designator) {
1707 if (image->single_file_system)
1708 return partition_designator == PARTITION_ROOT && image->can_verity;
1709
1710 return PARTITION_VERITY_OF(partition_designator) >= 0;
1711}
1712
1713bool dissected_image_has_verity(const DissectedImage *image, unsigned partition_designator) {
1714 int k;
1715
1716 if (image->single_file_system)
1717 return partition_designator == PARTITION_ROOT && image->verity;
1718
1719 k = PARTITION_VERITY_OF(partition_designator);
1720 return k >= 0 && image->partitions[k].found;
1721}
1722
8c1be37e
LP		 1723static const char *const partition_designator_table[] = {
1724 [PARTITION_ROOT] = "root",
1725 [PARTITION_ROOT_SECONDARY] = "root-secondary",
1726 [PARTITION_HOME] = "home",
1727 [PARTITION_SRV] = "srv",
1728 [PARTITION_ESP] = "esp",
a8c47660 1729 [PARTITION_XBOOTLDR] = "xbootldr",
8c1be37e 1730 [PARTITION_SWAP] = "swap",
4623e8e6
LP		 1731 [PARTITION_ROOT_VERITY] = "root-verity",
1732 [PARTITION_ROOT_SECONDARY_VERITY] = "root-secondary-verity",
d4dffb85
LP		 1733 [PARTITION_TMP] = "tmp",
1734 [PARTITION_VAR] = "var",
8c1be37e
LP		 1735};
1736
1737DEFINE_STRING_TABLE_LOOKUP(partition_designator, int);
Unnamed repository; edit this file 'description' to name the repository.