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[thirdparty/systemd.git] / src / shared / dissect-image.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #if HAVE_VALGRIND_MEMCHECK_H
4 #include <valgrind/memcheck.h>
5 #endif
6
7 #include <linux/dm-ioctl.h>
8 #include <linux/loop.h>
9 #include <sys/mount.h>
10 #include <sys/prctl.h>
11 #include <sys/wait.h>
12 #include <sysexits.h>
13
14 #include "sd-device.h"
15 #include "sd-id128.h"
16
17 #include "architecture.h"
18 #include "ask-password-api.h"
19 #include "blkid-util.h"
20 #include "blockdev-util.h"
21 #include "copy.h"
22 #include "cryptsetup-util.h"
23 #include "def.h"
24 #include "device-nodes.h"
25 #include "device-util.h"
26 #include "dissect-image.h"
27 #include "dm-util.h"
28 #include "env-file.h"
29 #include "fd-util.h"
30 #include "fileio.h"
31 #include "fs-util.h"
32 #include "fsck-util.h"
33 #include "gpt.h"
34 #include "hexdecoct.h"
35 #include "hostname-util.h"
36 #include "id128-util.h"
37 #include "mkdir.h"
38 #include "mount-util.h"
39 #include "mountpoint-util.h"
40 #include "namespace-util.h"
41 #include "nulstr-util.h"
42 #include "os-util.h"
43 #include "path-util.h"
44 #include "process-util.h"
45 #include "raw-clone.h"
46 #include "signal-util.h"
47 #include "stat-util.h"
48 #include "stdio-util.h"
49 #include "string-table.h"
50 #include "string-util.h"
51 #include "strv.h"
52 #include "tmpfile-util.h"
53 #include "udev-util.h"
54 #include "user-util.h"
55 #include "xattr-util.h"
56
57 /* how many times to wait for the device nodes to appear */
58 #define N_DEVICE_NODE_LIST_ATTEMPTS 10
59
60 int probe_filesystem(const char *node, char **ret_fstype) {
61 /* Try to find device content type and return it in *ret_fstype. If nothing is found,
62 * 0/NULL will be returned. -EUCLEAN will be returned for ambiguous results, and an
63 * different error otherwise. */
64
65 #if HAVE_BLKID
66 _cleanup_(blkid_free_probep) blkid_probe b = NULL;
67 const char *fstype;
68 int r;
69
70 errno = 0;
71 b = blkid_new_probe_from_filename(node);
72 if (!b)
73 return errno_or_else(ENOMEM);
74
75 blkid_probe_enable_superblocks(b, 1);
76 blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE);
77
78 errno = 0;
79 r = blkid_do_safeprobe(b);
80 if (r == 1) {
81 log_debug("No type detected on partition %s", node);
82 goto not_found;
83 }
84 if (r == -2)
85 return log_debug_errno(SYNTHETIC_ERRNO(EUCLEAN),
86 "Results ambiguous for partition %s", node);
87 if (r != 0)
88 return errno_or_else(EIO);
89
90 (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
91
92 if (fstype) {
93 char *t;
94
95 t = strdup(fstype);
96 if (!t)
97 return -ENOMEM;
98
99 *ret_fstype = t;
100 return 1;
101 }
102
103 not_found:
104 *ret_fstype = NULL;
105 return 0;
106 #else
107 return -EOPNOTSUPP;
108 #endif
109 }
110
111 #if HAVE_BLKID
112 /* Detect RPMB and Boot partitions, which are not listed by blkid.
113 * See https://github.com/systemd/systemd/issues/5806. */
114 static bool device_is_mmc_special_partition(sd_device *d) {
115 const char *sysname;
116
117 assert(d);
118
119 if (sd_device_get_sysname(d, &sysname) < 0)
120 return false;
121
122 return startswith(sysname, "mmcblk") &&
123 (endswith(sysname, "rpmb") || endswith(sysname, "boot0") || endswith(sysname, "boot1"));
124 }
125
126 static bool device_is_block(sd_device *d) {
127 const char *ss;
128
129 assert(d);
130
131 if (sd_device_get_subsystem(d, &ss) < 0)
132 return false;
133
134 return streq(ss, "block");
135 }
136
137 static int enumerator_for_parent(sd_device *d, sd_device_enumerator **ret) {
138 _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
139 int r;
140
141 assert(d);
142 assert(ret);
143
144 r = sd_device_enumerator_new(&e);
145 if (r < 0)
146 return r;
147
148 r = sd_device_enumerator_allow_uninitialized(e);
149 if (r < 0)
150 return r;
151
152 r = sd_device_enumerator_add_match_parent(e, d);
153 if (r < 0)
154 return r;
155
156 *ret = TAKE_PTR(e);
157 return 0;
158 }
159
160 static int wait_for_partitions_to_appear(
161 int fd,
162 sd_device *d,
163 unsigned num_partitions,
164 DissectImageFlags flags,
165 sd_device_enumerator **ret_enumerator) {
166
167 _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
168 sd_device *q;
169 unsigned n;
170 int r;
171
172 assert(fd >= 0);
173 assert(d);
174 assert(ret_enumerator);
175
176 r = enumerator_for_parent(d, &e);
177 if (r < 0)
178 return r;
179
180 /* Count the partitions enumerated by the kernel */
181 n = 0;
182 FOREACH_DEVICE(e, q) {
183 if (sd_device_get_devnum(q, NULL) < 0)
184 continue;
185 if (!device_is_block(q))
186 continue;
187 if (device_is_mmc_special_partition(q))
188 continue;
189
190 if (!FLAGS_SET(flags, DISSECT_IMAGE_NO_UDEV)) {
191 r = device_wait_for_initialization(q, "block", USEC_INFINITY, NULL);
192 if (r < 0)
193 return r;
194 }
195
196 n++;
197 }
198
199 if (n == num_partitions + 1) {
200 *ret_enumerator = TAKE_PTR(e);
201 return 0; /* success! */
202 }
203 if (n > num_partitions + 1)
204 return log_debug_errno(SYNTHETIC_ERRNO(EIO),
205 "blkid and kernel partition lists do not match.");
206
207 /* The kernel has probed fewer partitions than blkid? Maybe the kernel prober is still running or it
208 * got EBUSY because udev already opened the device. Let's reprobe the device, which is a synchronous
209 * call that waits until probing is complete. */
210
211 for (unsigned j = 0; ; j++) {
212 if (j++ > 20)
213 return -EBUSY;
214
215 if (ioctl(fd, BLKRRPART, 0) >= 0)
216 break;
217 r = -errno;
218 if (r == -EINVAL) {
219 /* If we are running on a block device that has partition scanning off, return an
220 * explicit recognizable error about this, so that callers can generate a proper
221 * message explaining the situation. */
222
223 r = blockdev_partscan_enabled(fd);
224 if (r < 0)
225 return r;
226 if (r == 0)
227 return log_debug_errno(EPROTONOSUPPORT,
228 "Device is a loop device and partition scanning is off!");
229
230 return -EINVAL; /* original error */
231 }
232 if (r != -EBUSY)
233 return r;
234
235 /* If something else has the device open, such as an udev rule, the ioctl will return
236 * EBUSY. Since there's no way to wait until it isn't busy anymore, let's just wait a bit,
237 * and try again.
238 *
239 * This is really something they should fix in the kernel! */
240 (void) usleep(50 * USEC_PER_MSEC);
241
242 }
243
244 return -EAGAIN; /* no success yet, try again */
245 }
246
247 static int loop_wait_for_partitions_to_appear(
248 int fd,
249 sd_device *d,
250 unsigned num_partitions,
251 DissectImageFlags flags,
252 sd_device_enumerator **ret_enumerator) {
253 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
254 int r;
255
256 assert(fd >= 0);
257 assert(d);
258 assert(ret_enumerator);
259
260 log_debug("Waiting for device (parent + %d partitions) to appear...", num_partitions);
261
262 if (!FLAGS_SET(flags, DISSECT_IMAGE_NO_UDEV)) {
263 r = device_wait_for_initialization(d, "block", USEC_INFINITY, &device);
264 if (r < 0)
265 return r;
266 } else
267 device = sd_device_ref(d);
268
269 for (unsigned i = 0; i < N_DEVICE_NODE_LIST_ATTEMPTS; i++) {
270 r = wait_for_partitions_to_appear(fd, device, num_partitions, flags, ret_enumerator);
271 if (r != -EAGAIN)
272 return r;
273 }
274
275 return log_debug_errno(SYNTHETIC_ERRNO(ENXIO),
276 "Kernel partitions dit not appear within %d attempts",
277 N_DEVICE_NODE_LIST_ATTEMPTS);
278 }
279
280 static void check_partition_flags(
281 const char *node,
282 unsigned long long pflags,
283 unsigned long long supported) {
284
285 assert(node);
286
287 /* Mask away all flags supported by this partition's type and the three flags the UEFI spec defines generically */
288 pflags &= ~(supported | GPT_FLAG_REQUIRED_PARTITION | GPT_FLAG_NO_BLOCK_IO_PROTOCOL | GPT_FLAG_LEGACY_BIOS_BOOTABLE);
289
290 if (pflags == 0)
291 return;
292
293 /* If there are other bits set, then log about it, to make things discoverable */
294 for (unsigned i = 0; i < sizeof(pflags) * 8; i++) {
295 unsigned long long bit = 1ULL << i;
296 if (!FLAGS_SET(pflags, bit))
297 continue;
298
299 log_debug("Unexpected partition flag %llu set on %s!", bit, node);
300 }
301 }
302
303 #endif
304
305 int dissect_image(
306 int fd,
307 const VeritySettings *verity,
308 const MountOptions *mount_options,
309 DissectImageFlags flags,
310 DissectedImage **ret) {
311
312 #if HAVE_BLKID
313 sd_id128_t root_uuid = SD_ID128_NULL, verity_uuid = SD_ID128_NULL;
314 _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
315 bool is_gpt, is_mbr, generic_rw, multiple_generic = false;
316 _cleanup_(sd_device_unrefp) sd_device *d = NULL;
317 _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL;
318 _cleanup_(blkid_free_probep) blkid_probe b = NULL;
319 _cleanup_free_ char *generic_node = NULL;
320 sd_id128_t generic_uuid = SD_ID128_NULL;
321 const char *pttype = NULL;
322 blkid_partlist pl;
323 int r, generic_nr;
324 struct stat st;
325 sd_device *q;
326
327 assert(fd >= 0);
328 assert(ret);
329 assert(!verity || verity->root_hash || verity->root_hash_size == 0);
330 assert(!((flags & DISSECT_IMAGE_GPT_ONLY) && (flags & DISSECT_IMAGE_NO_PARTITION_TABLE)));
331
332 /* Probes a disk image, and returns information about what it found in *ret.
333 *
334 * Returns -ENOPKG if no suitable partition table or file system could be found.
335 * Returns -EADDRNOTAVAIL if a root hash was specified but no matching root/verity partitions found. */
336
337 if (verity && verity->root_hash) {
338 /* If a root hash is supplied, then we use the root partition that has a UUID that match the first
339 * 128bit of the root hash. And we use the verity partition that has a UUID that match the final
340 * 128bit. */
341
342 if (verity->root_hash_size < sizeof(sd_id128_t))
343 return -EINVAL;
344
345 memcpy(&root_uuid, verity->root_hash, sizeof(sd_id128_t));
346 memcpy(&verity_uuid, (const uint8_t*) verity->root_hash + verity->root_hash_size - sizeof(sd_id128_t), sizeof(sd_id128_t));
347
348 if (sd_id128_is_null(root_uuid))
349 return -EINVAL;
350 if (sd_id128_is_null(verity_uuid))
351 return -EINVAL;
352 }
353
354 if (fstat(fd, &st) < 0)
355 return -errno;
356
357 if (!S_ISBLK(st.st_mode))
358 return -ENOTBLK;
359
360 b = blkid_new_probe();
361 if (!b)
362 return -ENOMEM;
363
364 errno = 0;
365 r = blkid_probe_set_device(b, fd, 0, 0);
366 if (r != 0)
367 return errno_or_else(ENOMEM);
368
369 if ((flags & DISSECT_IMAGE_GPT_ONLY) == 0) {
370 /* Look for file system superblocks, unless we only shall look for GPT partition tables */
371 blkid_probe_enable_superblocks(b, 1);
372 blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE|BLKID_SUBLKS_USAGE);
373 }
374
375 blkid_probe_enable_partitions(b, 1);
376 blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
377
378 errno = 0;
379 r = blkid_do_safeprobe(b);
380 if (IN_SET(r, -2, 1))
381 return log_debug_errno(SYNTHETIC_ERRNO(ENOPKG), "Failed to identify any partition table.");
382 if (r != 0)
383 return errno_or_else(EIO);
384
385 m = new0(DissectedImage, 1);
386 if (!m)
387 return -ENOMEM;
388
389 r = sd_device_new_from_devnum(&d, 'b', st.st_rdev);
390 if (r < 0)
391 return r;
392
393 if ((!(flags & DISSECT_IMAGE_GPT_ONLY) &&
394 (flags & DISSECT_IMAGE_REQUIRE_ROOT)) ||
395 (flags & DISSECT_IMAGE_NO_PARTITION_TABLE)) {
396 const char *usage = NULL;
397
398 (void) blkid_probe_lookup_value(b, "USAGE", &usage, NULL);
399 if (STRPTR_IN_SET(usage, "filesystem", "crypto")) {
400 _cleanup_free_ char *t = NULL, *n = NULL, *o = NULL;
401 const char *fstype = NULL, *options = NULL;
402
403 /* OK, we have found a file system, that's our root partition then. */
404 (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
405
406 if (fstype) {
407 t = strdup(fstype);
408 if (!t)
409 return -ENOMEM;
410 }
411
412 r = device_path_make_major_minor(st.st_mode, st.st_rdev, &n);
413 if (r < 0)
414 return r;
415
416 m->single_file_system = true;
417 m->verity = verity && verity->root_hash && verity->data_path;
418 m->can_verity = verity && verity->data_path;
419
420 options = mount_options_from_designator(mount_options, PARTITION_ROOT);
421 if (options) {
422 o = strdup(options);
423 if (!o)
424 return -ENOMEM;
425 }
426
427 m->partitions[PARTITION_ROOT] = (DissectedPartition) {
428 .found = true,
429 .rw = !m->verity,
430 .partno = -1,
431 .architecture = _ARCHITECTURE_INVALID,
432 .fstype = TAKE_PTR(t),
433 .node = TAKE_PTR(n),
434 .mount_options = TAKE_PTR(o),
435 };
436
437 m->encrypted = streq_ptr(fstype, "crypto_LUKS");
438
439 /* Even on a single partition we need to wait for udev to create the
440 * /dev/block/X:Y symlink to /dev/loopZ */
441 r = loop_wait_for_partitions_to_appear(fd, d, 0, flags, &e);
442 if (r < 0)
443 return r;
444 *ret = TAKE_PTR(m);
445
446 return 0;
447 }
448 }
449
450 (void) blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL);
451 if (!pttype)
452 return -ENOPKG;
453
454 is_gpt = streq_ptr(pttype, "gpt");
455 is_mbr = streq_ptr(pttype, "dos");
456
457 if (!is_gpt && ((flags & DISSECT_IMAGE_GPT_ONLY) || !is_mbr))
458 return -ENOPKG;
459
460 errno = 0;
461 pl = blkid_probe_get_partitions(b);
462 if (!pl)
463 return errno_or_else(ENOMEM);
464
465 r = loop_wait_for_partitions_to_appear(fd, d, blkid_partlist_numof_partitions(pl), flags, &e);
466 if (r < 0)
467 return r;
468
469 FOREACH_DEVICE(e, q) {
470 unsigned long long pflags;
471 blkid_partition pp;
472 const char *node;
473 dev_t qn;
474 int nr;
475
476 r = sd_device_get_devnum(q, &qn);
477 if (r < 0)
478 continue;
479
480 if (st.st_rdev == qn)
481 continue;
482
483 if (!device_is_block(q))
484 continue;
485
486 if (device_is_mmc_special_partition(q))
487 continue;
488
489 r = sd_device_get_devname(q, &node);
490 if (r < 0)
491 continue;
492
493 pp = blkid_partlist_devno_to_partition(pl, qn);
494 if (!pp)
495 continue;
496
497 pflags = blkid_partition_get_flags(pp);
498
499 nr = blkid_partition_get_partno(pp);
500 if (nr < 0)
501 continue;
502
503 if (is_gpt) {
504 PartitionDesignator designator = _PARTITION_DESIGNATOR_INVALID;
505 int architecture = _ARCHITECTURE_INVALID;
506 const char *stype, *sid, *fstype = NULL;
507 sd_id128_t type_id, id;
508 bool rw = true;
509
510 sid = blkid_partition_get_uuid(pp);
511 if (!sid)
512 continue;
513 if (sd_id128_from_string(sid, &id) < 0)
514 continue;
515
516 stype = blkid_partition_get_type_string(pp);
517 if (!stype)
518 continue;
519 if (sd_id128_from_string(stype, &type_id) < 0)
520 continue;
521
522 if (sd_id128_equal(type_id, GPT_HOME)) {
523
524 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
525
526 if (pflags & GPT_FLAG_NO_AUTO)
527 continue;
528
529 designator = PARTITION_HOME;
530 rw = !(pflags & GPT_FLAG_READ_ONLY);
531 } else if (sd_id128_equal(type_id, GPT_SRV)) {
532
533 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
534
535 if (pflags & GPT_FLAG_NO_AUTO)
536 continue;
537
538 designator = PARTITION_SRV;
539 rw = !(pflags & GPT_FLAG_READ_ONLY);
540 } else if (sd_id128_equal(type_id, GPT_ESP)) {
541
542 /* Note that we don't check the GPT_FLAG_NO_AUTO flag for the ESP, as it is not defined
543 * there. We instead check the GPT_FLAG_NO_BLOCK_IO_PROTOCOL, as recommended by the
544 * UEFI spec (See "12.3.3 Number and Location of System Partitions"). */
545
546 if (pflags & GPT_FLAG_NO_BLOCK_IO_PROTOCOL)
547 continue;
548
549 designator = PARTITION_ESP;
550 fstype = "vfat";
551
552 } else if (sd_id128_equal(type_id, GPT_XBOOTLDR)) {
553
554 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
555
556 if (pflags & GPT_FLAG_NO_AUTO)
557 continue;
558
559 designator = PARTITION_XBOOTLDR;
560 rw = !(pflags & GPT_FLAG_READ_ONLY);
561 }
562 #ifdef GPT_ROOT_NATIVE
563 else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) {
564
565 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
566
567 if (pflags & GPT_FLAG_NO_AUTO)
568 continue;
569
570 /* If a root ID is specified, ignore everything but the root id */
571 if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id))
572 continue;
573
574 designator = PARTITION_ROOT;
575 architecture = native_architecture();
576 rw = !(pflags & GPT_FLAG_READ_ONLY);
577 } else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE_VERITY)) {
578
579 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
580
581 if (pflags & GPT_FLAG_NO_AUTO)
582 continue;
583
584 m->can_verity = true;
585
586 /* Ignore verity unless a root hash is specified */
587 if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id))
588 continue;
589
590 designator = PARTITION_ROOT_VERITY;
591 fstype = "DM_verity_hash";
592 architecture = native_architecture();
593 rw = false;
594 }
595 #endif
596 #ifdef GPT_ROOT_SECONDARY
597 else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) {
598
599 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
600
601 if (pflags & GPT_FLAG_NO_AUTO)
602 continue;
603
604 /* If a root ID is specified, ignore everything but the root id */
605 if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id))
606 continue;
607
608 designator = PARTITION_ROOT_SECONDARY;
609 architecture = SECONDARY_ARCHITECTURE;
610 rw = !(pflags & GPT_FLAG_READ_ONLY);
611 } else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY_VERITY)) {
612
613 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
614
615 if (pflags & GPT_FLAG_NO_AUTO)
616 continue;
617
618 m->can_verity = true;
619
620 /* Ignore verity unless root has is specified */
621 if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id))
622 continue;
623
624 designator = PARTITION_ROOT_SECONDARY_VERITY;
625 fstype = "DM_verity_hash";
626 architecture = SECONDARY_ARCHITECTURE;
627 rw = false;
628 }
629 #endif
630 else if (sd_id128_equal(type_id, GPT_SWAP)) {
631
632 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO);
633
634 if (pflags & GPT_FLAG_NO_AUTO)
635 continue;
636
637 designator = PARTITION_SWAP;
638 fstype = "swap";
639 } else if (sd_id128_equal(type_id, GPT_LINUX_GENERIC)) {
640
641 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
642
643 if (pflags & GPT_FLAG_NO_AUTO)
644 continue;
645
646 if (generic_node)
647 multiple_generic = true;
648 else {
649 generic_nr = nr;
650 generic_rw = !(pflags & GPT_FLAG_READ_ONLY);
651 generic_uuid = id;
652 generic_node = strdup(node);
653 if (!generic_node)
654 return -ENOMEM;
655 }
656
657 } else if (sd_id128_equal(type_id, GPT_TMP)) {
658
659 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
660
661 if (pflags & GPT_FLAG_NO_AUTO)
662 continue;
663
664 designator = PARTITION_TMP;
665 rw = !(pflags & GPT_FLAG_READ_ONLY);
666
667 } else if (sd_id128_equal(type_id, GPT_VAR)) {
668
669 check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
670
671 if (pflags & GPT_FLAG_NO_AUTO)
672 continue;
673
674 if (!FLAGS_SET(flags, DISSECT_IMAGE_RELAX_VAR_CHECK)) {
675 sd_id128_t var_uuid;
676
677 /* For /var we insist that the uuid of the partition matches the
678 * HMAC-SHA256 of the /var GPT partition type uuid, keyed by machine
679 * ID. Why? Unlike the other partitions /var is inherently
680 * installation specific, hence we need to be careful not to mount it
681 * in the wrong installation. By hashing the partition UUID from
682 * /etc/machine-id we can securely bind the partition to the
683 * installation. */
684
685 r = sd_id128_get_machine_app_specific(GPT_VAR, &var_uuid);
686 if (r < 0)
687 return r;
688
689 if (!sd_id128_equal(var_uuid, id)) {
690 log_debug("Found a /var/ partition, but its UUID didn't match our expectations, ignoring.");
691 continue;
692 }
693 }
694
695 designator = PARTITION_VAR;
696 rw = !(pflags & GPT_FLAG_READ_ONLY);
697 }
698
699 if (designator != _PARTITION_DESIGNATOR_INVALID) {
700 _cleanup_free_ char *t = NULL, *n = NULL, *o = NULL;
701 const char *options = NULL;
702
703 /* First one wins */
704 if (m->partitions[designator].found)
705 continue;
706
707 if (fstype) {
708 t = strdup(fstype);
709 if (!t)
710 return -ENOMEM;
711 }
712
713 n = strdup(node);
714 if (!n)
715 return -ENOMEM;
716
717 options = mount_options_from_designator(mount_options, designator);
718 if (options) {
719 o = strdup(options);
720 if (!o)
721 return -ENOMEM;
722 }
723
724 m->partitions[designator] = (DissectedPartition) {
725 .found = true,
726 .partno = nr,
727 .rw = rw,
728 .architecture = architecture,
729 .node = TAKE_PTR(n),
730 .fstype = TAKE_PTR(t),
731 .uuid = id,
732 .mount_options = TAKE_PTR(o),
733 };
734 }
735
736 } else if (is_mbr) {
737
738 switch (blkid_partition_get_type(pp)) {
739
740 case 0x83: /* Linux partition */
741
742 if (pflags != 0x80) /* Bootable flag */
743 continue;
744
745 if (generic_node)
746 multiple_generic = true;
747 else {
748 generic_nr = nr;
749 generic_rw = true;
750 generic_node = strdup(node);
751 if (!generic_node)
752 return -ENOMEM;
753 }
754
755 break;
756
757 case 0xEA: { /* Boot Loader Spec extended $BOOT partition */
758 _cleanup_free_ char *n = NULL, *o = NULL;
759 sd_id128_t id = SD_ID128_NULL;
760 const char *sid, *options = NULL;
761
762 /* First one wins */
763 if (m->partitions[PARTITION_XBOOTLDR].found)
764 continue;
765
766 sid = blkid_partition_get_uuid(pp);
767 if (sid)
768 (void) sd_id128_from_string(sid, &id);
769
770 n = strdup(node);
771 if (!n)
772 return -ENOMEM;
773
774 options = mount_options_from_designator(mount_options, PARTITION_XBOOTLDR);
775 if (options) {
776 o = strdup(options);
777 if (!o)
778 return -ENOMEM;
779 }
780
781 m->partitions[PARTITION_XBOOTLDR] = (DissectedPartition) {
782 .found = true,
783 .partno = nr,
784 .rw = true,
785 .architecture = _ARCHITECTURE_INVALID,
786 .node = TAKE_PTR(n),
787 .uuid = id,
788 .mount_options = TAKE_PTR(o),
789 };
790
791 break;
792 }}
793 }
794 }
795
796 if (!m->partitions[PARTITION_ROOT].found) {
797 /* No root partition found? Then let's see if ther's one for the secondary architecture. And if not
798 * either, then check if there's a single generic one, and use that. */
799
800 if (m->partitions[PARTITION_ROOT_VERITY].found)
801 return -EADDRNOTAVAIL;
802
803 if (m->partitions[PARTITION_ROOT_SECONDARY].found) {
804 m->partitions[PARTITION_ROOT] = m->partitions[PARTITION_ROOT_SECONDARY];
805 zero(m->partitions[PARTITION_ROOT_SECONDARY]);
806
807 m->partitions[PARTITION_ROOT_VERITY] = m->partitions[PARTITION_ROOT_SECONDARY_VERITY];
808 zero(m->partitions[PARTITION_ROOT_SECONDARY_VERITY]);
809
810 } else if (flags & DISSECT_IMAGE_REQUIRE_ROOT) {
811 _cleanup_free_ char *o = NULL;
812 const char *options = NULL;
813
814 /* If the root hash was set, then we won't fall back to a generic node, because the
815 * root hash decides. */
816 if (verity && verity->root_hash)
817 return -EADDRNOTAVAIL;
818
819 /* If we didn't find a generic node, then we can't fix this up either */
820 if (!generic_node)
821 return -ENXIO;
822
823 /* If we didn't find a properly marked root partition, but we did find a single suitable
824 * generic Linux partition, then use this as root partition, if the caller asked for it. */
825 if (multiple_generic)
826 return -ENOTUNIQ;
827
828 options = mount_options_from_designator(mount_options, PARTITION_ROOT);
829 if (options) {
830 o = strdup(options);
831 if (!o)
832 return -ENOMEM;
833 }
834
835 m->partitions[PARTITION_ROOT] = (DissectedPartition) {
836 .found = true,
837 .rw = generic_rw,
838 .partno = generic_nr,
839 .architecture = _ARCHITECTURE_INVALID,
840 .node = TAKE_PTR(generic_node),
841 .uuid = generic_uuid,
842 .mount_options = TAKE_PTR(o),
843 };
844 }
845 }
846
847 if (verity && verity->root_hash) {
848 if (!m->partitions[PARTITION_ROOT_VERITY].found || !m->partitions[PARTITION_ROOT].found)
849 return -EADDRNOTAVAIL;
850
851 /* If we found the primary root with the hash, then we definitely want to suppress any secondary root
852 * (which would be weird, after all the root hash should only be assigned to one pair of
853 * partitions... */
854 m->partitions[PARTITION_ROOT_SECONDARY].found = false;
855 m->partitions[PARTITION_ROOT_SECONDARY_VERITY].found = false;
856
857 /* If we found a verity setup, then the root partition is necessarily read-only. */
858 m->partitions[PARTITION_ROOT].rw = false;
859
860 m->verity = true;
861 }
862
863 blkid_free_probe(b);
864 b = NULL;
865
866 /* Fill in file system types if we don't know them yet. */
867 for (PartitionDesignator i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
868 DissectedPartition *p = m->partitions + i;
869
870 if (!p->found)
871 continue;
872
873 if (!p->fstype && p->node) {
874 r = probe_filesystem(p->node, &p->fstype);
875 if (r < 0 && r != -EUCLEAN)
876 return r;
877 }
878
879 if (streq_ptr(p->fstype, "crypto_LUKS"))
880 m->encrypted = true;
881
882 if (p->fstype && fstype_is_ro(p->fstype))
883 p->rw = false;
884 }
885
886 *ret = TAKE_PTR(m);
887
888 return 0;
889 #else
890 return -EOPNOTSUPP;
891 #endif
892 }
893
894 DissectedImage* dissected_image_unref(DissectedImage *m) {
895 if (!m)
896 return NULL;
897
898 for (PartitionDesignator i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
899 free(m->partitions[i].fstype);
900 free(m->partitions[i].node);
901 free(m->partitions[i].decrypted_fstype);
902 free(m->partitions[i].decrypted_node);
903 free(m->partitions[i].mount_options);
904 }
905
906 free(m->hostname);
907 strv_free(m->machine_info);
908 strv_free(m->os_release);
909
910 return mfree(m);
911 }
912
913 static int is_loop_device(const char *path) {
914 char s[SYS_BLOCK_PATH_MAX("/../loop/")];
915 struct stat st;
916
917 assert(path);
918
919 if (stat(path, &st) < 0)
920 return -errno;
921
922 if (!S_ISBLK(st.st_mode))
923 return -ENOTBLK;
924
925 xsprintf_sys_block_path(s, "/loop/", st.st_dev);
926 if (access(s, F_OK) < 0) {
927 if (errno != ENOENT)
928 return -errno;
929
930 /* The device itself isn't a loop device, but maybe it's a partition and its parent is? */
931 xsprintf_sys_block_path(s, "/../loop/", st.st_dev);
932 if (access(s, F_OK) < 0)
933 return errno == ENOENT ? false : -errno;
934 }
935
936 return true;
937 }
938
939 static int run_fsck(const char *node, const char *fstype) {
940 int r, exit_status;
941 pid_t pid;
942
943 assert(node);
944 assert(fstype);
945
946 r = fsck_exists(fstype);
947 if (r < 0) {
948 log_debug_errno(r, "Couldn't determine whether fsck for %s exists, proceeding anyway.", fstype);
949 return 0;
950 }
951 if (r == 0) {
952 log_debug("Not checking partition %s, as fsck for %s does not exist.", node, fstype);
953 return 0;
954 }
955
956 r = safe_fork("(fsck)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_RLIMIT_NOFILE_SAFE|FORK_DEATHSIG|FORK_NULL_STDIO, &pid);
957 if (r < 0)
958 return log_debug_errno(r, "Failed to fork off fsck: %m");
959 if (r == 0) {
960 /* Child */
961 execl("/sbin/fsck", "/sbin/fsck", "-aT", node, NULL);
962 log_debug_errno(errno, "Failed to execl() fsck: %m");
963 _exit(FSCK_OPERATIONAL_ERROR);
964 }
965
966 exit_status = wait_for_terminate_and_check("fsck", pid, 0);
967 if (exit_status < 0)
968 return log_debug_errno(exit_status, "Failed to fork off /sbin/fsck: %m");
969
970 if ((exit_status & ~FSCK_ERROR_CORRECTED) != FSCK_SUCCESS) {
971 log_debug("fsck failed with exit status %i.", exit_status);
972
973 if ((exit_status & (FSCK_SYSTEM_SHOULD_REBOOT|FSCK_ERRORS_LEFT_UNCORRECTED)) != 0)
974 return log_debug_errno(SYNTHETIC_ERRNO(EUCLEAN), "File system is corrupted, refusing.");
975
976 log_debug("Ignoring fsck error.");
977 }
978
979 return 0;
980 }
981
982 static int mount_partition(
983 DissectedPartition *m,
984 const char *where,
985 const char *directory,
986 uid_t uid_shift,
987 DissectImageFlags flags) {
988
989 _cleanup_free_ char *chased = NULL, *options = NULL;
990 const char *p, *node, *fstype;
991 bool rw;
992 int r;
993
994 assert(m);
995 assert(where);
996
997 /* Use decrypted node and matching fstype if available, otherwise use the original device */
998 node = m->decrypted_node ?: m->node;
999 fstype = m->decrypted_node ? m->decrypted_fstype: m->fstype;
1000
1001 if (!m->found || !node)
1002 return 0;
1003 if (!fstype)
1004 return -EAFNOSUPPORT;
1005
1006 /* We are looking at an encrypted partition? This either means stacked encryption, or the caller didn't call dissected_image_decrypt() beforehand. Let's return a recognizable error for this case. */
1007 if (streq(fstype, "crypto_LUKS"))
1008 return -EUNATCH;
1009
1010 rw = m->rw && !(flags & DISSECT_IMAGE_READ_ONLY);
1011
1012 if (FLAGS_SET(flags, DISSECT_IMAGE_FSCK) && rw) {
1013 r = run_fsck(node, fstype);
1014 if (r < 0)
1015 return r;
1016 }
1017
1018 if (directory) {
1019 if (!FLAGS_SET(flags, DISSECT_IMAGE_READ_ONLY)) {
1020 /* Automatically create missing mount points, if necessary. */
1021 r = mkdir_p_root(where, directory, uid_shift, (gid_t) uid_shift, 0755);
1022 if (r < 0)
1023 return r;
1024 }
1025
1026 r = chase_symlinks(directory, where, CHASE_PREFIX_ROOT, &chased, NULL);
1027 if (r < 0)
1028 return r;
1029
1030 p = chased;
1031 } else
1032 p = where;
1033
1034 /* If requested, turn on discard support. */
1035 if (fstype_can_discard(fstype) &&
1036 ((flags & DISSECT_IMAGE_DISCARD) ||
1037 ((flags & DISSECT_IMAGE_DISCARD_ON_LOOP) && is_loop_device(m->node)))) {
1038 options = strdup("discard");
1039 if (!options)
1040 return -ENOMEM;
1041 }
1042
1043 if (uid_is_valid(uid_shift) && uid_shift != 0 && fstype_can_uid_gid(fstype)) {
1044 _cleanup_free_ char *uid_option = NULL;
1045
1046 if (asprintf(&uid_option, "uid=" UID_FMT ",gid=" GID_FMT, uid_shift, (gid_t) uid_shift) < 0)
1047 return -ENOMEM;
1048
1049 if (!strextend_with_separator(&options, ",", uid_option, NULL))
1050 return -ENOMEM;
1051 }
1052
1053 if (!isempty(m->mount_options))
1054 if (!strextend_with_separator(&options, ",", m->mount_options, NULL))
1055 return -ENOMEM;
1056
1057 if (FLAGS_SET(flags, DISSECT_IMAGE_MKDIR)) {
1058 r = mkdir_p(p, 0755);
1059 if (r < 0)
1060 return r;
1061 }
1062
1063 r = mount_verbose(LOG_DEBUG, node, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), options);
1064 if (r < 0)
1065 return r;
1066
1067 return 1;
1068 }
1069
1070 int dissected_image_mount(DissectedImage *m, const char *where, uid_t uid_shift, DissectImageFlags flags) {
1071 int r, xbootldr_mounted;
1072
1073 assert(m);
1074 assert(where);
1075
1076 /* Returns:
1077 *
1078 * -ENXIO → No root partition found
1079 * -EMEDIUMTYPE → DISSECT_IMAGE_VALIDATE_OS set but no os-release file found
1080 * -EUNATCH → Encrypted partition found for which no dm-crypt was set up yet
1081 * -EUCLEAN → fsck for file system failed
1082 * -EBUSY → File system already mounted/used elsewhere (kernel)
1083 * -EAFNOSUPPORT → File system type not supported or not known
1084 */
1085
1086 if (!m->partitions[PARTITION_ROOT].found)
1087 return -ENXIO;
1088
1089 if ((flags & DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY) == 0) {
1090 r = mount_partition(m->partitions + PARTITION_ROOT, where, NULL, uid_shift, flags);
1091 if (r < 0)
1092 return r;
1093
1094 if (flags & DISSECT_IMAGE_VALIDATE_OS) {
1095 r = path_is_os_tree(where);
1096 if (r < 0)
1097 return r;
1098 if (r == 0)
1099 return -EMEDIUMTYPE;
1100 }
1101 }
1102
1103 if (flags & DISSECT_IMAGE_MOUNT_ROOT_ONLY)
1104 return 0;
1105
1106 /* Mask DISSECT_IMAGE_MKDIR for all subdirs: the idea is that only the top-level mount point is
1107 * created if needed, but the image itself not modified. */
1108 flags &= ~DISSECT_IMAGE_MKDIR;
1109
1110 r = mount_partition(m->partitions + PARTITION_HOME, where, "/home", uid_shift, flags);
1111 if (r < 0)
1112 return r;
1113
1114 r = mount_partition(m->partitions + PARTITION_SRV, where, "/srv", uid_shift, flags);
1115 if (r < 0)
1116 return r;
1117
1118 r = mount_partition(m->partitions + PARTITION_VAR, where, "/var", uid_shift, flags);
1119 if (r < 0)
1120 return r;
1121
1122 r = mount_partition(m->partitions + PARTITION_TMP, where, "/var/tmp", uid_shift, flags);
1123 if (r < 0)
1124 return r;
1125
1126 xbootldr_mounted = mount_partition(m->partitions + PARTITION_XBOOTLDR, where, "/boot", uid_shift, flags);
1127 if (xbootldr_mounted < 0)
1128 return xbootldr_mounted;
1129
1130 if (m->partitions[PARTITION_ESP].found) {
1131 int esp_done = false;
1132
1133 /* Mount the ESP to /efi if it exists. If it doesn't exist, use /boot instead, but only if it
1134 * exists and is empty, and we didn't already mount the XBOOTLDR partition into it. */
1135
1136 r = chase_symlinks("/efi", where, CHASE_PREFIX_ROOT, NULL, NULL);
1137 if (r < 0) {
1138 if (r != -ENOENT)
1139 return r;
1140
1141 /* /efi doesn't exist. Let's see if /boot is suitable then */
1142
1143 if (!xbootldr_mounted) {
1144 _cleanup_free_ char *p = NULL;
1145
1146 r = chase_symlinks("/boot", where, CHASE_PREFIX_ROOT, &p, NULL);
1147 if (r < 0) {
1148 if (r != -ENOENT)
1149 return r;
1150 } else if (dir_is_empty(p) > 0) {
1151 /* It exists and is an empty directory. Let's mount the ESP there. */
1152 r = mount_partition(m->partitions + PARTITION_ESP, where, "/boot", uid_shift, flags);
1153 if (r < 0)
1154 return r;
1155
1156 esp_done = true;
1157 }
1158 }
1159 }
1160
1161 if (!esp_done) {
1162 /* OK, let's mount the ESP now to /efi (possibly creating the dir if missing) */
1163
1164 r = mount_partition(m->partitions + PARTITION_ESP, where, "/efi", uid_shift, flags);
1165 if (r < 0)
1166 return r;
1167 }
1168 }
1169
1170 return 0;
1171 }
1172
1173 int dissected_image_mount_and_warn(DissectedImage *m, const char *where, uid_t uid_shift, DissectImageFlags flags) {
1174 int r;
1175
1176 assert(m);
1177 assert(where);
1178
1179 r = dissected_image_mount(m, where, uid_shift, flags);
1180 if (r == -ENXIO)
1181 return log_error_errno(r, "Not root file system found in image.");
1182 if (r == -EMEDIUMTYPE)
1183 return log_error_errno(r, "No suitable os-release file in image found.");
1184 if (r == -EUNATCH)
1185 return log_error_errno(r, "Encrypted file system discovered, but decryption not requested.");
1186 if (r == -EUCLEAN)
1187 return log_error_errno(r, "File system check on image failed.");
1188 if (r == -EBUSY)
1189 return log_error_errno(r, "File system already mounted elsewhere.");
1190 if (r == -EAFNOSUPPORT)
1191 return log_error_errno(r, "File system type not supported or not known.");
1192 if (r < 0)
1193 return log_error_errno(r, "Failed to mount image: %m");
1194
1195 return r;
1196 }
1197
1198 #if HAVE_LIBCRYPTSETUP
1199 typedef struct DecryptedPartition {
1200 struct crypt_device *device;
1201 char *name;
1202 bool relinquished;
1203 } DecryptedPartition;
1204
1205 struct DecryptedImage {
1206 DecryptedPartition *decrypted;
1207 size_t n_decrypted;
1208 size_t n_allocated;
1209 };
1210 #endif
1211
1212 DecryptedImage* decrypted_image_unref(DecryptedImage* d) {
1213 #if HAVE_LIBCRYPTSETUP
1214 size_t i;
1215 int r;
1216
1217 if (!d)
1218 return NULL;
1219
1220 for (i = 0; i < d->n_decrypted; i++) {
1221 DecryptedPartition *p = d->decrypted + i;
1222
1223 if (p->device && p->name && !p->relinquished) {
1224 r = sym_crypt_deactivate_by_name(p->device, p->name, 0);
1225 if (r < 0)
1226 log_debug_errno(r, "Failed to deactivate encrypted partition %s", p->name);
1227 }
1228
1229 if (p->device)
1230 sym_crypt_free(p->device);
1231 free(p->name);
1232 }
1233
1234 free(d);
1235 #endif
1236 return NULL;
1237 }
1238
1239 #if HAVE_LIBCRYPTSETUP
1240
1241 static int make_dm_name_and_node(const void *original_node, const char *suffix, char **ret_name, char **ret_node) {
1242 _cleanup_free_ char *name = NULL, *node = NULL;
1243 const char *base;
1244
1245 assert(original_node);
1246 assert(suffix);
1247 assert(ret_name);
1248 assert(ret_node);
1249
1250 base = strrchr(original_node, '/');
1251 if (!base)
1252 base = original_node;
1253 else
1254 base++;
1255 if (isempty(base))
1256 return -EINVAL;
1257
1258 name = strjoin(base, suffix);
1259 if (!name)
1260 return -ENOMEM;
1261 if (!filename_is_valid(name))
1262 return -EINVAL;
1263
1264 node = path_join(sym_crypt_get_dir(), name);
1265 if (!node)
1266 return -ENOMEM;
1267
1268 *ret_name = TAKE_PTR(name);
1269 *ret_node = TAKE_PTR(node);
1270
1271 return 0;
1272 }
1273
1274 static int decrypt_partition(
1275 DissectedPartition *m,
1276 const char *passphrase,
1277 DissectImageFlags flags,
1278 DecryptedImage *d) {
1279
1280 _cleanup_free_ char *node = NULL, *name = NULL;
1281 _cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL;
1282 int r;
1283
1284 assert(m);
1285 assert(d);
1286
1287 if (!m->found || !m->node || !m->fstype)
1288 return 0;
1289
1290 if (!streq(m->fstype, "crypto_LUKS"))
1291 return 0;
1292
1293 if (!passphrase)
1294 return -ENOKEY;
1295
1296 r = dlopen_cryptsetup();
1297 if (r < 0)
1298 return r;
1299
1300 r = make_dm_name_and_node(m->node, "-decrypted", &name, &node);
1301 if (r < 0)
1302 return r;
1303
1304 if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1))
1305 return -ENOMEM;
1306
1307 r = sym_crypt_init(&cd, m->node);
1308 if (r < 0)
1309 return log_debug_errno(r, "Failed to initialize dm-crypt: %m");
1310
1311 cryptsetup_enable_logging(cd);
1312
1313 r = sym_crypt_load(cd, CRYPT_LUKS, NULL);
1314 if (r < 0)
1315 return log_debug_errno(r, "Failed to load LUKS metadata: %m");
1316
1317 r = sym_crypt_activate_by_passphrase(cd, name, CRYPT_ANY_SLOT, passphrase, strlen(passphrase),
1318 ((flags & DISSECT_IMAGE_READ_ONLY) ? CRYPT_ACTIVATE_READONLY : 0) |
1319 ((flags & DISSECT_IMAGE_DISCARD_ON_CRYPTO) ? CRYPT_ACTIVATE_ALLOW_DISCARDS : 0));
1320 if (r < 0) {
1321 log_debug_errno(r, "Failed to activate LUKS device: %m");
1322 return r == -EPERM ? -EKEYREJECTED : r;
1323 }
1324
1325 d->decrypted[d->n_decrypted].name = TAKE_PTR(name);
1326 d->decrypted[d->n_decrypted].device = TAKE_PTR(cd);
1327 d->n_decrypted++;
1328
1329 m->decrypted_node = TAKE_PTR(node);
1330
1331 return 0;
1332 }
1333
1334 static int verity_can_reuse(
1335 const VeritySettings *verity,
1336 const char *name,
1337 struct crypt_device **ret_cd) {
1338
1339 /* If the same volume was already open, check that the root hashes match, and reuse it if they do */
1340 _cleanup_free_ char *root_hash_existing = NULL;
1341 _cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL;
1342 struct crypt_params_verity crypt_params = {};
1343 size_t root_hash_existing_size;
1344 int r;
1345
1346 assert(verity);
1347 assert(name);
1348 assert(ret_cd);
1349
1350 r = sym_crypt_init_by_name(&cd, name);
1351 if (r < 0)
1352 return log_debug_errno(r, "Error opening verity device, crypt_init_by_name failed: %m");
1353
1354 r = sym_crypt_get_verity_info(cd, &crypt_params);
1355 if (r < 0)
1356 return log_debug_errno(r, "Error opening verity device, crypt_get_verity_info failed: %m");
1357
1358 root_hash_existing_size = verity->root_hash_size;
1359 root_hash_existing = malloc0(root_hash_existing_size);
1360 if (!root_hash_existing)
1361 return -ENOMEM;
1362
1363 r = sym_crypt_volume_key_get(cd, CRYPT_ANY_SLOT, root_hash_existing, &root_hash_existing_size, NULL, 0);
1364 if (r < 0)
1365 return log_debug_errno(r, "Error opening verity device, crypt_volume_key_get failed: %m");
1366 if (verity->root_hash_size != root_hash_existing_size ||
1367 memcmp(root_hash_existing, verity->root_hash, verity->root_hash_size) != 0)
1368 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Error opening verity device, it already exists but root hashes are different.");
1369
1370 #if HAVE_CRYPT_ACTIVATE_BY_SIGNED_KEY
1371 /* Ensure that, if signatures are supported, we only reuse the device if the previous mount used the
1372 * same settings, so that a previous unsigned mount will not be reused if the user asks to use
1373 * signing for the new one, and viceversa. */
1374 if (!!verity->root_hash_sig != !!(crypt_params.flags & CRYPT_VERITY_ROOT_HASH_SIGNATURE))
1375 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Error opening verity device, it already exists but signature settings are not the same.");
1376 #endif
1377
1378 *ret_cd = TAKE_PTR(cd);
1379 return 0;
1380 }
1381
1382 static inline void dm_deferred_remove_clean(char *name) {
1383 if (!name)
1384 return;
1385
1386 (void) sym_crypt_deactivate_by_name(NULL, name, CRYPT_DEACTIVATE_DEFERRED);
1387 free(name);
1388 }
1389 DEFINE_TRIVIAL_CLEANUP_FUNC(char *, dm_deferred_remove_clean);
1390
1391 static int verity_partition(
1392 DissectedPartition *m,
1393 DissectedPartition *v,
1394 const VeritySettings *verity,
1395 DissectImageFlags flags,
1396 DecryptedImage *d) {
1397
1398 _cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL;
1399 _cleanup_(dm_deferred_remove_cleanp) char *restore_deferred_remove = NULL;
1400 _cleanup_free_ char *node = NULL, *name = NULL;
1401 int r;
1402
1403 assert(m);
1404 assert(v || (verity && verity->data_path));
1405
1406 if (!verity || !verity->root_hash)
1407 return 0;
1408
1409 if (!m->found || !m->node || !m->fstype)
1410 return 0;
1411 if (!verity->data_path) {
1412 if (!v->found || !v->node || !v->fstype)
1413 return 0;
1414
1415 if (!streq(v->fstype, "DM_verity_hash"))
1416 return 0;
1417 }
1418
1419 r = dlopen_cryptsetup();
1420 if (r < 0)
1421 return r;
1422
1423 if (FLAGS_SET(flags, DISSECT_IMAGE_VERITY_SHARE)) {
1424 /* Use the roothash, which is unique per volume, as the device node name, so that it can be reused */
1425 _cleanup_free_ char *root_hash_encoded = NULL;
1426
1427 root_hash_encoded = hexmem(verity->root_hash, verity->root_hash_size);
1428 if (!root_hash_encoded)
1429
1430 return -ENOMEM;
1431 r = make_dm_name_and_node(root_hash_encoded, "-verity", &name, &node);
1432 } else
1433 r = make_dm_name_and_node(m->node, "-verity", &name, &node);
1434 if (r < 0)
1435 return r;
1436
1437 r = sym_crypt_init(&cd, verity->data_path ?: v->node);
1438 if (r < 0)
1439 return r;
1440
1441 cryptsetup_enable_logging(cd);
1442
1443 r = sym_crypt_load(cd, CRYPT_VERITY, NULL);
1444 if (r < 0)
1445 return r;
1446
1447 r = sym_crypt_set_data_device(cd, m->node);
1448 if (r < 0)
1449 return r;
1450
1451 if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1))
1452 return -ENOMEM;
1453
1454 /* If activating fails because the device already exists, check the metadata and reuse it if it matches.
1455 * In case of ENODEV/ENOENT, which can happen if another process is activating at the exact same time,
1456 * retry a few times before giving up. */
1457 for (unsigned i = 0; i < N_DEVICE_NODE_LIST_ATTEMPTS; i++) {
1458 if (verity->root_hash_sig) {
1459 #if HAVE_CRYPT_ACTIVATE_BY_SIGNED_KEY
1460 r = sym_crypt_activate_by_signed_key(
1461 cd,
1462 name,
1463 verity->root_hash,
1464 verity->root_hash_size,
1465 verity->root_hash_sig,
1466 verity->root_hash_sig_size,
1467 CRYPT_ACTIVATE_READONLY);
1468 #else
1469 r = log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
1470 "Activation of verity device with signature requested, but not supported by %s due to missing crypt_activate_by_signed_key().", program_invocation_short_name);
1471 #endif
1472 } else
1473 r = sym_crypt_activate_by_volume_key(
1474 cd,
1475 name,
1476 verity->root_hash,
1477 verity->root_hash_size,
1478 CRYPT_ACTIVATE_READONLY);
1479 /* libdevmapper can return EINVAL when the device is already in the activation stage.
1480 * There's no way to distinguish this situation from a genuine error due to invalid
1481 * parameters, so immediately fall back to activating the device with a unique name.
1482 * Improvements in libcrypsetup can ensure this never happens:
1483 * https://gitlab.com/cryptsetup/cryptsetup/-/merge_requests/96 */
1484 if (r == -EINVAL && FLAGS_SET(flags, DISSECT_IMAGE_VERITY_SHARE))
1485 return verity_partition(m, v, verity, flags & ~DISSECT_IMAGE_VERITY_SHARE, d);
1486 if (!IN_SET(r,
1487 0, /* Success */
1488 -EEXIST, /* Volume is already open and ready to be used */
1489 -EBUSY, /* Volume is being opened but not ready, crypt_init_by_name can fetch details */
1490 -ENODEV /* Volume is being opened but not ready, crypt_init_by_name would fail, try to open again */))
1491 return r;
1492 if (IN_SET(r, -EEXIST, -EBUSY)) {
1493 struct crypt_device *existing_cd = NULL;
1494
1495 if (!restore_deferred_remove){
1496 /* To avoid races, disable automatic removal on umount while setting up the new device. Restore it on failure. */
1497 r = dm_deferred_remove_cancel(name);
1498 /* If activation returns EBUSY there might be no deferred removal to cancel, that's fine */
1499 if (r < 0 && r != -ENXIO)
1500 return log_debug_errno(r, "Disabling automated deferred removal for verity device %s failed: %m", node);
1501 if (r == 0) {
1502 restore_deferred_remove = strdup(name);
1503 if (!restore_deferred_remove)
1504 return -ENOMEM;
1505 }
1506 }
1507
1508 r = verity_can_reuse(verity, name, &existing_cd);
1509 /* Same as above, -EINVAL can randomly happen when it actually means -EEXIST */
1510 if (r == -EINVAL && FLAGS_SET(flags, DISSECT_IMAGE_VERITY_SHARE))
1511 return verity_partition(m, v, verity, flags & ~DISSECT_IMAGE_VERITY_SHARE, d);
1512 if (!IN_SET(r, 0, -ENODEV, -ENOENT, -EBUSY))
1513 return log_debug_errno(r, "Checking whether existing verity device %s can be reused failed: %m", node);
1514 if (r == 0) {
1515 /* devmapper might say that the device exists, but the devlink might not yet have been
1516 * created. Check and wait for the udev event in that case. */
1517 r = device_wait_for_devlink(node, "block", 100 * USEC_PER_MSEC, NULL);
1518 /* Fallback to activation with a unique device if it's taking too long */
1519 if (r == -ETIMEDOUT)
1520 break;
1521 if (r < 0)
1522 return r;
1523
1524 if (cd)
1525 sym_crypt_free(cd);
1526 cd = existing_cd;
1527 }
1528 }
1529 if (r == 0)
1530 break;
1531
1532 /* Device is being opened by another process, but it has not finished yet, yield for 2ms */
1533 (void) usleep(2 * USEC_PER_MSEC);
1534 }
1535
1536 /* An existing verity device was reported by libcryptsetup/libdevmapper, but we can't use it at this time.
1537 * Fall back to activating it with a unique device name. */
1538 if (r != 0 && FLAGS_SET(flags, DISSECT_IMAGE_VERITY_SHARE))
1539 return verity_partition(m, v, verity, flags & ~DISSECT_IMAGE_VERITY_SHARE, d);
1540
1541 /* Everything looks good and we'll be able to mount the device, so deferred remove will be re-enabled at that point. */
1542 restore_deferred_remove = mfree(restore_deferred_remove);
1543
1544 d->decrypted[d->n_decrypted].name = TAKE_PTR(name);
1545 d->decrypted[d->n_decrypted].device = TAKE_PTR(cd);
1546 d->n_decrypted++;
1547
1548 m->decrypted_node = TAKE_PTR(node);
1549
1550 return 0;
1551 }
1552 #endif
1553
1554 int dissected_image_decrypt(
1555 DissectedImage *m,
1556 const char *passphrase,
1557 const VeritySettings *verity,
1558 DissectImageFlags flags,
1559 DecryptedImage **ret) {
1560
1561 #if HAVE_LIBCRYPTSETUP
1562 _cleanup_(decrypted_image_unrefp) DecryptedImage *d = NULL;
1563 int r;
1564 #endif
1565
1566 assert(m);
1567 assert(!verity || verity->root_hash || verity->root_hash_size == 0);
1568
1569 /* Returns:
1570 *
1571 * = 0 → There was nothing to decrypt
1572 * > 0 → Decrypted successfully
1573 * -ENOKEY → There's something to decrypt but no key was supplied
1574 * -EKEYREJECTED → Passed key was not correct
1575 */
1576
1577 if (verity && verity->root_hash && verity->root_hash_size < sizeof(sd_id128_t))
1578 return -EINVAL;
1579
1580 if (!m->encrypted && !m->verity) {
1581 *ret = NULL;
1582 return 0;
1583 }
1584
1585 #if HAVE_LIBCRYPTSETUP
1586 d = new0(DecryptedImage, 1);
1587 if (!d)
1588 return -ENOMEM;
1589
1590 for (PartitionDesignator i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
1591 DissectedPartition *p = m->partitions + i;
1592 PartitionDesignator k;
1593
1594 if (!p->found)
1595 continue;
1596
1597 r = decrypt_partition(p, passphrase, flags, d);
1598 if (r < 0)
1599 return r;
1600
1601 k = PARTITION_VERITY_OF(i);
1602 if (k >= 0) {
1603 r = verity_partition(p, m->partitions + k, verity, flags | DISSECT_IMAGE_VERITY_SHARE, d);
1604 if (r < 0)
1605 return r;
1606 }
1607
1608 if (!p->decrypted_fstype && p->decrypted_node) {
1609 r = probe_filesystem(p->decrypted_node, &p->decrypted_fstype);
1610 if (r < 0 && r != -EUCLEAN)
1611 return r;
1612 }
1613 }
1614
1615 *ret = TAKE_PTR(d);
1616
1617 return 1;
1618 #else
1619 return -EOPNOTSUPP;
1620 #endif
1621 }
1622
1623 int dissected_image_decrypt_interactively(
1624 DissectedImage *m,
1625 const char *passphrase,
1626 const VeritySettings *verity,
1627 DissectImageFlags flags,
1628 DecryptedImage **ret) {
1629
1630 _cleanup_strv_free_erase_ char **z = NULL;
1631 int n = 3, r;
1632
1633 if (passphrase)
1634 n--;
1635
1636 for (;;) {
1637 r = dissected_image_decrypt(m, passphrase, verity, flags, ret);
1638 if (r >= 0)
1639 return r;
1640 if (r == -EKEYREJECTED)
1641 log_error_errno(r, "Incorrect passphrase, try again!");
1642 else if (r != -ENOKEY)
1643 return log_error_errno(r, "Failed to decrypt image: %m");
1644
1645 if (--n < 0)
1646 return log_error_errno(SYNTHETIC_ERRNO(EKEYREJECTED),
1647 "Too many retries.");
1648
1649 z = strv_free(z);
1650
1651 r = ask_password_auto("Please enter image passphrase:", NULL, "dissect", "dissect", USEC_INFINITY, 0, &z);
1652 if (r < 0)
1653 return log_error_errno(r, "Failed to query for passphrase: %m");
1654
1655 passphrase = z[0];
1656 }
1657 }
1658
1659 int decrypted_image_relinquish(DecryptedImage *d) {
1660
1661 #if HAVE_LIBCRYPTSETUP
1662 size_t i;
1663 int r;
1664 #endif
1665
1666 assert(d);
1667
1668 /* Turns on automatic removal after the last use ended for all DM devices of this image, and sets a boolean so
1669 * that we don't clean it up ourselves either anymore */
1670
1671 #if HAVE_LIBCRYPTSETUP
1672 for (i = 0; i < d->n_decrypted; i++) {
1673 DecryptedPartition *p = d->decrypted + i;
1674
1675 if (p->relinquished)
1676 continue;
1677
1678 r = sym_crypt_deactivate_by_name(NULL, p->name, CRYPT_DEACTIVATE_DEFERRED);
1679 if (r < 0)
1680 return log_debug_errno(r, "Failed to mark %s for auto-removal: %m", p->name);
1681
1682 p->relinquished = true;
1683 }
1684 #endif
1685
1686 return 0;
1687 }
1688
1689 static char *build_auxiliary_path(const char *image, const char *suffix) {
1690 const char *e;
1691 char *n;
1692
1693 assert(image);
1694 assert(suffix);
1695
1696 e = endswith(image, ".raw");
1697 if (!e)
1698 return strjoin(e, suffix);
1699
1700 n = new(char, e - image + strlen(suffix) + 1);
1701 if (!n)
1702 return NULL;
1703
1704 strcpy(mempcpy(n, image, e - image), suffix);
1705 return n;
1706 }
1707
1708 void verity_settings_done(VeritySettings *v) {
1709 assert(v);
1710
1711 v->root_hash = mfree(v->root_hash);
1712 v->root_hash_size = 0;
1713
1714 v->root_hash_sig = mfree(v->root_hash_sig);
1715 v->root_hash_sig_size = 0;
1716
1717 v->data_path = mfree(v->data_path);
1718 }
1719
1720 int verity_settings_load(
1721 VeritySettings *verity,
1722 const char *image,
1723 const char *root_hash_path,
1724 const char *root_hash_sig_path) {
1725
1726 _cleanup_free_ void *root_hash = NULL, *root_hash_sig = NULL;
1727 size_t root_hash_size = 0, root_hash_sig_size = 0;
1728 _cleanup_free_ char *verity_data_path = NULL;
1729 int r;
1730
1731 assert(verity);
1732 assert(image);
1733
1734 /* If we are asked to load the root hash for a device node, exit early */
1735 if (is_device_path(image))
1736 return 0;
1737
1738 /* We only fill in what isn't already filled in */
1739
1740 if (!verity->root_hash) {
1741 _cleanup_free_ char *text = NULL;
1742
1743 if (root_hash_path) {
1744 r = read_one_line_file(root_hash_path, &text);
1745 if (r < 0)
1746 return r;
1747 } else {
1748 r = getxattr_malloc(image, "user.verity.roothash", &text, true);
1749 if (r < 0) {
1750 _cleanup_free_ char *p = NULL;
1751
1752 if (!IN_SET(r, -ENODATA, -ENOENT) && !ERRNO_IS_NOT_SUPPORTED(r))
1753 return r;
1754
1755 p = build_auxiliary_path(image, ".roothash");
1756 if (!p)
1757 return -ENOMEM;
1758
1759 r = read_one_line_file(p, &text);
1760 if (r < 0 && r != -ENOENT)
1761 return r;
1762 }
1763 }
1764
1765 if (text) {
1766 r = unhexmem(text, strlen(text), &root_hash, &root_hash_size);
1767 if (r < 0)
1768 return r;
1769 if (root_hash_size < sizeof(sd_id128_t))
1770 return -EINVAL;
1771 }
1772 }
1773
1774 if (!verity->root_hash_sig) {
1775 _cleanup_free_ char *p = NULL;
1776
1777 if (!root_hash_sig_path) {
1778 /* Follow naming convention recommended by the relevant RFC:
1779 * https://tools.ietf.org/html/rfc5751#section-3.2.1 */
1780 p = build_auxiliary_path(image, ".roothash.p7s");
1781 if (!p)
1782 return -ENOMEM;
1783
1784 root_hash_sig_path = p;
1785 }
1786
1787 r = read_full_file_full(AT_FDCWD, root_hash_sig_path, 0, (char**) &root_hash_sig, &root_hash_sig_size);
1788 if (r < 0) {
1789 if (r != -ENOENT)
1790 return r;
1791 } else if (root_hash_sig_size == 0) /* refuse empty size signatures */
1792 return -EINVAL;
1793 }
1794
1795 if (!verity->data_path) {
1796 _cleanup_free_ char *p = NULL;
1797
1798 p = build_auxiliary_path(image, ".verity");
1799 if (!p)
1800 return -ENOMEM;
1801
1802 if (access(p, F_OK) < 0) {
1803 if (errno != ENOENT)
1804 return -errno;
1805 } else
1806 verity_data_path = TAKE_PTR(p);
1807 }
1808
1809 if (root_hash) {
1810 verity->root_hash = TAKE_PTR(root_hash);
1811 verity->root_hash_size = root_hash_size;
1812 }
1813
1814 if (root_hash_sig) {
1815 verity->root_hash_sig = TAKE_PTR(root_hash_sig);
1816 verity->root_hash_sig_size = root_hash_sig_size;
1817 }
1818
1819 if (verity_data_path)
1820 verity->data_path = TAKE_PTR(verity_data_path);
1821
1822 return 1;
1823 }
1824
1825 int dissected_image_acquire_metadata(DissectedImage *m) {
1826
1827 enum {
1828 META_HOSTNAME,
1829 META_MACHINE_ID,
1830 META_MACHINE_INFO,
1831 META_OS_RELEASE,
1832 _META_MAX,
1833 };
1834
1835 static const char *const paths[_META_MAX] = {
1836 [META_HOSTNAME] = "/etc/hostname\0",
1837 [META_MACHINE_ID] = "/etc/machine-id\0",
1838 [META_MACHINE_INFO] = "/etc/machine-info\0",
1839 [META_OS_RELEASE] = "/etc/os-release\0"
1840 "/usr/lib/os-release\0",
1841 };
1842
1843 _cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL;
1844 _cleanup_close_pair_ int error_pipe[2] = { -1, -1 };
1845 _cleanup_(rmdir_and_freep) char *t = NULL;
1846 _cleanup_(sigkill_waitp) pid_t child = 0;
1847 sd_id128_t machine_id = SD_ID128_NULL;
1848 _cleanup_free_ char *hostname = NULL;
1849 unsigned n_meta_initialized = 0, k;
1850 int fds[2 * _META_MAX], r, v;
1851 ssize_t n;
1852
1853 BLOCK_SIGNALS(SIGCHLD);
1854
1855 assert(m);
1856
1857 for (; n_meta_initialized < _META_MAX; n_meta_initialized ++)
1858 if (pipe2(fds + 2*n_meta_initialized, O_CLOEXEC) < 0) {
1859 r = -errno;
1860 goto finish;
1861 }
1862
1863 r = mkdtemp_malloc("/tmp/dissect-XXXXXX", &t);
1864 if (r < 0)
1865 goto finish;
1866
1867 if (pipe2(error_pipe, O_CLOEXEC) < 0) {
1868 r = -errno;
1869 goto finish;
1870 }
1871
1872 r = safe_fork("(sd-dissect)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_NEW_MOUNTNS|FORK_MOUNTNS_SLAVE, &child);
1873 if (r < 0)
1874 goto finish;
1875 if (r == 0) {
1876 error_pipe[0] = safe_close(error_pipe[0]);
1877
1878 r = dissected_image_mount(m, t, UID_INVALID, DISSECT_IMAGE_READ_ONLY|DISSECT_IMAGE_MOUNT_ROOT_ONLY|DISSECT_IMAGE_VALIDATE_OS);
1879 if (r < 0) {
1880 /* Let parent know the error */
1881 (void) write(error_pipe[1], &r, sizeof(r));
1882
1883 log_debug_errno(r, "Failed to mount dissected image: %m");
1884 _exit(EXIT_FAILURE);
1885 }
1886
1887 for (k = 0; k < _META_MAX; k++) {
1888 _cleanup_close_ int fd = -ENOENT;
1889 const char *p;
1890
1891 fds[2*k] = safe_close(fds[2*k]);
1892
1893 NULSTR_FOREACH(p, paths[k]) {
1894 fd = chase_symlinks_and_open(p, t, CHASE_PREFIX_ROOT, O_RDONLY|O_CLOEXEC|O_NOCTTY, NULL);
1895 if (fd >= 0)
1896 break;
1897 }
1898 if (fd < 0) {
1899 log_debug_errno(fd, "Failed to read %s file of image, ignoring: %m", paths[k]);
1900 fds[2*k+1] = safe_close(fds[2*k+1]);
1901 continue;
1902 }
1903
1904 r = copy_bytes(fd, fds[2*k+1], (uint64_t) -1, 0);
1905 if (r < 0) {
1906 (void) write(error_pipe[1], &r, sizeof(r));
1907 _exit(EXIT_FAILURE);
1908 }
1909
1910 fds[2*k+1] = safe_close(fds[2*k+1]);
1911 }
1912
1913 _exit(EXIT_SUCCESS);
1914 }
1915
1916 error_pipe[1] = safe_close(error_pipe[1]);
1917
1918 for (k = 0; k < _META_MAX; k++) {
1919 _cleanup_fclose_ FILE *f = NULL;
1920
1921 fds[2*k+1] = safe_close(fds[2*k+1]);
1922
1923 f = take_fdopen(&fds[2*k], "r");
1924 if (!f) {
1925 r = -errno;
1926 goto finish;
1927 }
1928
1929 switch (k) {
1930
1931 case META_HOSTNAME:
1932 r = read_etc_hostname_stream(f, &hostname);
1933 if (r < 0)
1934 log_debug_errno(r, "Failed to read /etc/hostname: %m");
1935
1936 break;
1937
1938 case META_MACHINE_ID: {
1939 _cleanup_free_ char *line = NULL;
1940
1941 r = read_line(f, LONG_LINE_MAX, &line);
1942 if (r < 0)
1943 log_debug_errno(r, "Failed to read /etc/machine-id: %m");
1944 else if (r == 33) {
1945 r = sd_id128_from_string(line, &machine_id);
1946 if (r < 0)
1947 log_debug_errno(r, "Image contains invalid /etc/machine-id: %s", line);
1948 } else if (r == 0)
1949 log_debug("/etc/machine-id file is empty.");
1950 else
1951 log_debug("/etc/machine-id has unexpected length %i.", r);
1952
1953 break;
1954 }
1955
1956 case META_MACHINE_INFO:
1957 r = load_env_file_pairs(f, "machine-info", &machine_info);
1958 if (r < 0)
1959 log_debug_errno(r, "Failed to read /etc/machine-info: %m");
1960
1961 break;
1962
1963 case META_OS_RELEASE:
1964 r = load_env_file_pairs(f, "os-release", &os_release);
1965 if (r < 0)
1966 log_debug_errno(r, "Failed to read OS release file: %m");
1967
1968 break;
1969 }
1970 }
1971
1972 r = wait_for_terminate_and_check("(sd-dissect)", child, 0);
1973 child = 0;
1974 if (r < 0)
1975 return r;
1976
1977 n = read(error_pipe[0], &v, sizeof(v));
1978 if (n < 0)
1979 return -errno;
1980 if (n == sizeof(v))
1981 return v; /* propagate error sent to us from child */
1982 if (n != 0)
1983 return -EIO;
1984
1985 if (r != EXIT_SUCCESS)
1986 return -EPROTO;
1987
1988 free_and_replace(m->hostname, hostname);
1989 m->machine_id = machine_id;
1990 strv_free_and_replace(m->machine_info, machine_info);
1991 strv_free_and_replace(m->os_release, os_release);
1992
1993 finish:
1994 for (k = 0; k < n_meta_initialized; k++)
1995 safe_close_pair(fds + 2*k);
1996
1997 return r;
1998 }
1999
2000 int dissect_image_and_warn(
2001 int fd,
2002 const char *name,
2003 const VeritySettings *verity,
2004 const MountOptions *mount_options,
2005 DissectImageFlags flags,
2006 DissectedImage **ret) {
2007
2008 _cleanup_free_ char *buffer = NULL;
2009 int r;
2010
2011 if (!name) {
2012 r = fd_get_path(fd, &buffer);
2013 if (r < 0)
2014 return r;
2015
2016 name = buffer;
2017 }
2018
2019 r = dissect_image(fd, verity, mount_options, flags, ret);
2020
2021 switch (r) {
2022
2023 case -EOPNOTSUPP:
2024 return log_error_errno(r, "Dissecting images is not supported, compiled without blkid support.");
2025
2026 case -ENOPKG:
2027 return log_error_errno(r, "Couldn't identify a suitable partition table or file system in '%s'.", name);
2028
2029 case -EADDRNOTAVAIL:
2030 return log_error_errno(r, "No root partition for specified root hash found in '%s'.", name);
2031
2032 case -ENOTUNIQ:
2033 return log_error_errno(r, "Multiple suitable root partitions found in image '%s'.", name);
2034
2035 case -ENXIO:
2036 return log_error_errno(r, "No suitable root partition found in image '%s'.", name);
2037
2038 case -EPROTONOSUPPORT:
2039 return log_error_errno(r, "Device '%s' is loopback block device with partition scanning turned off, please turn it on.", name);
2040
2041 default:
2042 if (r < 0)
2043 return log_error_errno(r, "Failed to dissect image '%s': %m", name);
2044
2045 return r;
2046 }
2047 }
2048
2049 bool dissected_image_can_do_verity(const DissectedImage *image, PartitionDesignator partition_designator) {
2050 if (image->single_file_system)
2051 return partition_designator == PARTITION_ROOT && image->can_verity;
2052
2053 return PARTITION_VERITY_OF(partition_designator) >= 0;
2054 }
2055
2056 bool dissected_image_has_verity(const DissectedImage *image, PartitionDesignator partition_designator) {
2057 int k;
2058
2059 if (image->single_file_system)
2060 return partition_designator == PARTITION_ROOT && image->verity;
2061
2062 k = PARTITION_VERITY_OF(partition_designator);
2063 return k >= 0 && image->partitions[k].found;
2064 }
2065
2066 MountOptions* mount_options_free_all(MountOptions *options) {
2067 MountOptions *m;
2068
2069 while ((m = options)) {
2070 LIST_REMOVE(mount_options, options, m);
2071 free(m->options);
2072 free(m);
2073 }
2074
2075 return NULL;
2076 }
2077
2078 const char* mount_options_from_designator(const MountOptions *options, PartitionDesignator designator) {
2079 const MountOptions *m;
2080
2081 LIST_FOREACH(mount_options, m, options)
2082 if (designator == m->partition_designator && !isempty(m->options))
2083 return m->options;
2084
2085 return NULL;
2086 }
2087
2088 int mount_image_privately_interactively(
2089 const char *image,
2090 DissectImageFlags flags,
2091 char **ret_directory,
2092 LoopDevice **ret_loop_device,
2093 DecryptedImage **ret_decrypted_image) {
2094
2095 _cleanup_(loop_device_unrefp) LoopDevice *d = NULL;
2096 _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL;
2097 _cleanup_(dissected_image_unrefp) DissectedImage *dissected_image = NULL;
2098 _cleanup_(rmdir_and_freep) char *created_dir = NULL;
2099 _cleanup_free_ char *temp = NULL;
2100 int r;
2101
2102 /* Mounts an OS image at a temporary place, inside a newly created mount namespace of our own. This
2103 * is used by tools such as systemd-tmpfiles or systemd-firstboot to operate on some disk image
2104 * easily. */
2105
2106 assert(image);
2107 assert(ret_directory);
2108 assert(ret_loop_device);
2109 assert(ret_decrypted_image);
2110
2111 r = tempfn_random_child(NULL, program_invocation_short_name, &temp);
2112 if (r < 0)
2113 return log_error_errno(r, "Failed to generate temporary mount directory: %m");
2114
2115 r = loop_device_make_by_path(
2116 image,
2117 FLAGS_SET(flags, DISSECT_IMAGE_READ_ONLY) ? O_RDONLY : O_RDWR,
2118 FLAGS_SET(flags, DISSECT_IMAGE_NO_PARTITION_TABLE) ? 0 : LO_FLAGS_PARTSCAN,
2119 &d);
2120 if (r < 0)
2121 return log_error_errno(r, "Failed to set up loopback device: %m");
2122
2123 r = dissect_image_and_warn(d->fd, image, NULL, NULL, flags, &dissected_image);
2124 if (r < 0)
2125 return r;
2126
2127 r = dissected_image_decrypt_interactively(dissected_image, NULL, NULL, flags, &decrypted_image);
2128 if (r < 0)
2129 return r;
2130
2131 r = detach_mount_namespace();
2132 if (r < 0)
2133 return log_error_errno(r, "Failed to detach mount namespace: %m");
2134
2135 r = mkdir_p(temp, 0700);
2136 if (r < 0)
2137 return log_error_errno(r, "Failed to create mount point: %m");
2138
2139 created_dir = TAKE_PTR(temp);
2140
2141 r = dissected_image_mount_and_warn(dissected_image, created_dir, UID_INVALID, flags);
2142 if (r < 0)
2143 return r;
2144
2145 if (decrypted_image) {
2146 r = decrypted_image_relinquish(decrypted_image);
2147 if (r < 0)
2148 return log_error_errno(r, "Failed to relinquish DM devices: %m");
2149 }
2150
2151 loop_device_relinquish(d);
2152
2153 *ret_directory = TAKE_PTR(created_dir);
2154 *ret_loop_device = TAKE_PTR(d);
2155 *ret_decrypted_image = TAKE_PTR(decrypted_image);
2156
2157 return 0;
2158 }
2159
2160 static const char *const partition_designator_table[] = {
2161 [PARTITION_ROOT] = "root",
2162 [PARTITION_ROOT_SECONDARY] = "root-secondary",
2163 [PARTITION_HOME] = "home",
2164 [PARTITION_SRV] = "srv",
2165 [PARTITION_ESP] = "esp",
2166 [PARTITION_XBOOTLDR] = "xbootldr",
2167 [PARTITION_SWAP] = "swap",
2168 [PARTITION_ROOT_VERITY] = "root-verity",
2169 [PARTITION_ROOT_SECONDARY_VERITY] = "root-secondary-verity",
2170 [PARTITION_TMP] = "tmp",
2171 [PARTITION_VAR] = "var",
2172 };
2173
2174 DEFINE_STRING_TABLE_LOOKUP(partition_designator, PartitionDesignator);
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