1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
3 #if HAVE_VALGRIND_MEMCHECK_H
4 #include <valgrind/memcheck.h>
7 #include <linux/dm-ioctl.h>
8 #include <linux/loop.h>
10 #include <sys/mount.h>
11 #include <sys/prctl.h>
16 #include <openssl/err.h>
17 #include <openssl/pem.h>
18 #include <openssl/x509.h>
21 #include "sd-device.h"
24 #include "architecture.h"
25 #include "ask-password-api.h"
26 #include "blkid-util.h"
27 #include "blockdev-util.h"
28 #include "btrfs-util.h"
29 #include "chase-symlinks.h"
30 #include "conf-files.h"
31 #include "constants.h"
33 #include "cryptsetup-util.h"
34 #include "device-nodes.h"
35 #include "device-util.h"
36 #include "devnum-util.h"
37 #include "discover-image.h"
38 #include "dissect-image.h"
42 #include "extension-release.h"
46 #include "fsck-util.h"
48 #include "hexdecoct.h"
49 #include "hostname-setup.h"
50 #include "id128-util.h"
51 #include "import-util.h"
53 #include "mkdir-label.h"
54 #include "mount-util.h"
55 #include "mountpoint-util.h"
56 #include "namespace-util.h"
57 #include "nulstr-util.h"
58 #include "openssl-util.h"
60 #include "path-util.h"
61 #include "process-util.h"
62 #include "raw-clone.h"
63 #include "resize-fs.h"
64 #include "signal-util.h"
65 #include "sparse-endian.h"
66 #include "stat-util.h"
67 #include "stdio-util.h"
68 #include "string-table.h"
69 #include "string-util.h"
71 #include "tmpfile-util.h"
72 #include "udev-util.h"
73 #include "user-util.h"
74 #include "xattr-util.h"
76 /* how many times to wait for the device nodes to appear */
77 #define N_DEVICE_NODE_LIST_ATTEMPTS 10
79 int dissect_fstype_ok(const char *fstype
) {
83 /* When we automatically mount file systems, be a bit conservative by default what we are willing to
84 * mount, just as an extra safety net to not mount with badly maintained legacy file system
87 e
= secure_getenv("SYSTEMD_DISSECT_FILE_SYSTEMS");
89 _cleanup_strv_free_
char **l
= NULL
;
91 l
= strv_split(e
, ":");
95 b
= strv_contains(l
, fstype
);
97 b
= STR_IN_SET(fstype
,
107 log_debug("File system type '%s' is not allowed to be mounted as result of automatic dissection.", fstype
);
111 int probe_sector_size(int fd
, uint32_t *ret
) {
120 le64_t alternate_lba
;
121 le64_t first_usable_lba
;
122 le64_t last_usable_lba
;
123 sd_id128_t disk_guid
;
124 le64_t partition_entry_lba
;
125 le32_t number_of_partition_entries
;
126 le32_t size_of_partition_entry
;
127 le32_t partition_entry_array_crc32
;
130 /* Disk images might be for 512B or for 4096 sector sizes, let's try to auto-detect that by searching
131 * for the GPT headers at the relevant byte offsets */
133 assert_cc(sizeof(struct gpt_header
) == 92);
135 /* We expect a sector size in the range 512…4096. The GPT header is located in the second
136 * sector. Hence it could be at byte 512 at the earliest, and at byte 4096 at the latest. And we must
137 * read with granularity of the largest sector size we care about. Which means 8K. */
138 uint8_t sectors
[2 * 4096];
145 n
= pread(fd
, sectors
, sizeof(sectors
), 0);
148 if (n
!= sizeof(sectors
)) /* too short? */
151 /* Let's see if we find the GPT partition header with various expected sector sizes */
152 for (uint32_t sz
= 512; sz
<= 4096; sz
<<= 1) {
153 struct gpt_header
*p
;
155 assert(sizeof(sectors
) >= sz
* 2);
156 p
= (struct gpt_header
*) (sectors
+ sz
);
158 if (memcmp(p
->signature
, (const char[8]) { 'E', 'F', 'I', ' ', 'P', 'A', 'R', 'T' }, 8) != 0)
161 if (le32toh(p
->revision
) != UINT32_C(0x00010000)) /* the only known revision of the spec: 1.0 */
164 if (le32toh(p
->header_size
) < sizeof(struct gpt_header
))
167 if (le32toh(p
->header_size
) > 4096) /* larger than a sector? something is off… */
170 if (le64toh(p
->my_lba
) != 1) /* this sector must claim to be at sector offset 1 */
174 return log_debug_errno(SYNTHETIC_ERRNO(ENOTUNIQ
),
175 "Detected valid partition table at offsets matching multiple sector sizes, refusing.");
181 log_debug("Determined sector size %" PRIu32
" based on discovered partition table.", found
);
183 return 1; /* indicate we *did* find it */
187 log_debug("Couldn't find any partition table to derive sector size of.");
188 *ret
= 512; /* pick the traditional default */
189 return 0; /* indicate we didn't find it */
192 int probe_sector_size_prefer_ioctl(int fd
, uint32_t *ret
) {
198 /* Just like probe_sector_size(), but if we are looking at a block device, will use the already
199 * configured sector size rather than probing by contents */
201 if (fstat(fd
, &st
) < 0)
204 if (S_ISBLK(st
.st_mode
))
205 return blockdev_get_sector_size(fd
, ret
);
207 return probe_sector_size(fd
, ret
);
210 int probe_filesystem_full(
217 /* Try to find device content type and return it in *ret_fstype. If nothing is found,
218 * 0/NULL will be returned. -EUCLEAN will be returned for ambiguous results, and a
219 * different error otherwise. */
222 _cleanup_(blkid_free_probep
) blkid_probe b
= NULL
;
223 _cleanup_free_
char *path_by_fd
= NULL
;
224 _cleanup_close_
int fd_close
= -EBADF
;
228 assert(fd
>= 0 || path
);
232 fd_close
= open(path
, O_RDONLY
|O_NONBLOCK
|O_CLOEXEC
|O_NOCTTY
);
240 r
= fd_get_path(fd
, &path_by_fd
);
247 if (size
== 0) /* empty size? nothing found! */
250 b
= blkid_new_probe();
255 r
= blkid_probe_set_device(
259 size
== UINT64_MAX
? 0 : size
); /* when blkid sees size=0 it understands "everything". We prefer using UINT64_MAX for that */
261 return errno_or_else(ENOMEM
);
263 blkid_probe_enable_superblocks(b
, 1);
264 blkid_probe_set_superblocks_flags(b
, BLKID_SUBLKS_TYPE
);
267 r
= blkid_do_safeprobe(b
);
268 if (r
== _BLKID_SAFEPROBE_NOT_FOUND
)
270 if (r
== _BLKID_SAFEPROBE_AMBIGUOUS
)
271 return log_debug_errno(SYNTHETIC_ERRNO(EUCLEAN
),
272 "Results ambiguous for partition %s", path
);
273 if (r
== _BLKID_SAFEPROBE_ERROR
)
274 return log_debug_errno(errno_or_else(EIO
), "Failed to probe partition %s: %m", path
);
276 assert(r
== _BLKID_SAFEPROBE_FOUND
);
278 (void) blkid_probe_lookup_value(b
, "TYPE", &fstype
, NULL
);
283 log_debug("Probed fstype '%s' on partition %s.", fstype
, path
);
294 log_debug("No type detected on partition %s", path
);
303 static int dissected_image_probe_filesystems(DissectedImage
*m
, int fd
) {
308 /* Fill in file system types if we don't know them yet. */
310 for (PartitionDesignator i
= 0; i
< _PARTITION_DESIGNATOR_MAX
; i
++) {
311 DissectedPartition
*p
= m
->partitions
+ i
;
317 /* If we have an fd referring to the partition block device, use that. Otherwise go
318 * via the whole block device or backing regular file, and read via offset. */
319 if (p
->mount_node_fd
>= 0)
320 r
= probe_filesystem_full(p
->mount_node_fd
, p
->node
, 0, UINT64_MAX
, &p
->fstype
);
322 r
= probe_filesystem_full(fd
, p
->node
, p
->offset
, p
->size
, &p
->fstype
);
327 if (streq_ptr(p
->fstype
, "crypto_LUKS"))
330 if (p
->fstype
&& fstype_is_ro(p
->fstype
))
340 static void check_partition_flags(
342 unsigned long long pflags
,
343 unsigned long long supported
) {
347 /* Mask away all flags supported by this partition's type and the three flags the UEFI spec defines generically */
348 pflags
&= ~(supported
|
349 SD_GPT_FLAG_REQUIRED_PARTITION
|
350 SD_GPT_FLAG_NO_BLOCK_IO_PROTOCOL
|
351 SD_GPT_FLAG_LEGACY_BIOS_BOOTABLE
);
356 /* If there are other bits set, then log about it, to make things discoverable */
357 for (unsigned i
= 0; i
< sizeof(pflags
) * 8; i
++) {
358 unsigned long long bit
= 1ULL << i
;
359 if (!FLAGS_SET(pflags
, bit
))
362 log_debug("Unexpected partition flag %llu set on %s!", bit
, node
);
368 static int dissected_image_new(const char *path
, DissectedImage
**ret
) {
369 _cleanup_(dissected_image_unrefp
) DissectedImage
*m
= NULL
;
370 _cleanup_free_
char *name
= NULL
;
376 _cleanup_free_
char *filename
= NULL
;
378 r
= path_extract_filename(path
, &filename
);
382 r
= raw_strip_suffixes(filename
, &name
);
386 if (!image_name_is_valid(name
)) {
387 log_debug("Image name %s is not valid, ignoring.", strna(name
));
392 m
= new(DissectedImage
, 1);
396 *m
= (DissectedImage
) {
397 .has_init_system
= -1,
398 .image_name
= TAKE_PTR(name
),
401 for (PartitionDesignator i
= 0; i
< _PARTITION_DESIGNATOR_MAX
; i
++)
402 m
->partitions
[i
] = DISSECTED_PARTITION_NULL
;
409 static void dissected_partition_done(DissectedPartition
*p
) {
415 free(p
->decrypted_fstype
);
416 free(p
->decrypted_node
);
417 free(p
->mount_options
);
418 safe_close(p
->mount_node_fd
);
420 *p
= DISSECTED_PARTITION_NULL
;
424 static int make_partition_devname(
425 const char *whole_devname
,
428 DissectImageFlags flags
,
431 _cleanup_free_
char *s
= NULL
;
434 assert(whole_devname
);
435 assert(nr
!= 0); /* zero is not a valid partition nr */
438 if (!FLAGS_SET(flags
, DISSECT_IMAGE_DISKSEQ_DEVNODE
) || diskseq
== 0) {
440 /* Given a whole block device node name (e.g. /dev/sda or /dev/loop7) generate a partition
441 * device name (e.g. /dev/sda7 or /dev/loop7p5). The rule the kernel uses is simple: if whole
442 * block device node name ends in a digit, then suffix a 'p', followed by the partition
443 * number. Otherwise, just suffix the partition number without any 'p'. */
445 if (nr
< 0) { /* whole disk? */
446 s
= strdup(whole_devname
);
450 size_t l
= strlen(whole_devname
);
451 if (l
< 1) /* underflow check for the subtraction below */
454 bool need_p
= ascii_isdigit(whole_devname
[l
-1]); /* Last char a digit? */
456 if (asprintf(&s
, "%s%s%i", whole_devname
, need_p
? "p" : "", nr
) < 0)
460 if (nr
< 0) /* whole disk? */
461 r
= asprintf(&s
, "/dev/disk/by-diskseq/%" PRIu64
, diskseq
);
463 r
= asprintf(&s
, "/dev/disk/by-diskseq/%" PRIu64
"-part%i", diskseq
, nr
);
472 static int open_partition(
475 const LoopDevice
*loop
) {
477 _cleanup_(sd_device_unrefp
) sd_device
*dev
= NULL
;
478 _cleanup_close_
int fd
= -EBADF
;
485 fd
= open(node
, O_RDONLY
|O_NONBLOCK
|O_CLOEXEC
|O_NOCTTY
);
489 /* Check if the block device is a child of (or equivalent to) the originally provided one. */
490 r
= block_device_new_from_fd(fd
, is_partition
? BLOCK_DEVICE_LOOKUP_WHOLE_DISK
: 0, &dev
);
494 r
= sd_device_get_devnum(dev
, &devnum
);
498 if (loop
->devno
!= devnum
)
501 /* Also check diskseq. */
502 if (loop
->diskseq
!= 0) {
505 r
= fd_get_diskseq(fd
, &diskseq
);
509 if (loop
->diskseq
!= diskseq
)
513 log_debug("Opened %s (fd=%i, whole_block_devnum=" DEVNUM_FORMAT_STR
", diskseq=%" PRIu64
").",
514 node
, fd
, DEVNUM_FORMAT_VAL(loop
->devno
), loop
->diskseq
);
518 static int compare_arch(Architecture a
, Architecture b
) {
522 if (a
== native_architecture())
525 if (b
== native_architecture())
528 #ifdef ARCHITECTURE_SECONDARY
529 if (a
== ARCHITECTURE_SECONDARY
)
532 if (b
== ARCHITECTURE_SECONDARY
)
539 static int dissect_image(
543 const VeritySettings
*verity
,
544 const MountOptions
*mount_options
,
545 DissectImageFlags flags
) {
547 sd_id128_t root_uuid
= SD_ID128_NULL
, root_verity_uuid
= SD_ID128_NULL
;
548 sd_id128_t usr_uuid
= SD_ID128_NULL
, usr_verity_uuid
= SD_ID128_NULL
;
549 bool is_gpt
, is_mbr
, multiple_generic
= false,
550 generic_rw
= false, /* initialize to appease gcc */
551 generic_growfs
= false;
552 _cleanup_(blkid_free_probep
) blkid_probe b
= NULL
;
553 _cleanup_free_
char *generic_node
= NULL
;
554 sd_id128_t generic_uuid
= SD_ID128_NULL
;
555 const char *pttype
= NULL
, *sptuuid
= NULL
;
557 int r
, generic_nr
= -1, n_partitions
;
562 assert(!verity
|| verity
->designator
< 0 || IN_SET(verity
->designator
, PARTITION_ROOT
, PARTITION_USR
));
563 assert(!verity
|| verity
->root_hash
|| verity
->root_hash_size
== 0);
564 assert(!verity
|| verity
->root_hash_sig
|| verity
->root_hash_sig_size
== 0);
565 assert(!verity
|| (verity
->root_hash
|| !verity
->root_hash_sig
));
566 assert(!((flags
& DISSECT_IMAGE_GPT_ONLY
) && (flags
& DISSECT_IMAGE_NO_PARTITION_TABLE
)));
567 assert(m
->sector_size
> 0);
569 /* Probes a disk image, and returns information about what it found in *ret.
571 * Returns -ENOPKG if no suitable partition table or file system could be found.
572 * Returns -EADDRNOTAVAIL if a root hash was specified but no matching root/verity partitions found.
573 * Returns -ENXIO if we couldn't find any partition suitable as root or /usr partition
574 * Returns -ENOTUNIQ if we only found multiple generic partitions and thus don't know what to do with that */
576 uint64_t diskseq
= m
->loop
? m
->loop
->diskseq
: 0;
578 if (verity
&& verity
->root_hash
) {
579 sd_id128_t fsuuid
, vuuid
;
581 /* If a root hash is supplied, then we use the root partition that has a UUID that match the
582 * first 128bit of the root hash. And we use the verity partition that has a UUID that match
583 * the final 128bit. */
585 if (verity
->root_hash_size
< sizeof(sd_id128_t
))
588 memcpy(&fsuuid
, verity
->root_hash
, sizeof(sd_id128_t
));
589 memcpy(&vuuid
, (const uint8_t*) verity
->root_hash
+ verity
->root_hash_size
- sizeof(sd_id128_t
), sizeof(sd_id128_t
));
591 if (sd_id128_is_null(fsuuid
))
593 if (sd_id128_is_null(vuuid
))
596 /* If the verity data declares it's for the /usr partition, then search for that, in all
597 * other cases assume it's for the root partition. */
598 if (verity
->designator
== PARTITION_USR
) {
600 usr_verity_uuid
= vuuid
;
603 root_verity_uuid
= vuuid
;
607 b
= blkid_new_probe();
612 r
= blkid_probe_set_device(b
, fd
, 0, 0);
614 return errno_or_else(ENOMEM
);
617 r
= blkid_probe_set_sectorsize(b
, m
->sector_size
);
619 return errno_or_else(EIO
);
621 if ((flags
& DISSECT_IMAGE_GPT_ONLY
) == 0) {
622 /* Look for file system superblocks, unless we only shall look for GPT partition tables */
623 blkid_probe_enable_superblocks(b
, 1);
624 blkid_probe_set_superblocks_flags(b
, BLKID_SUBLKS_TYPE
|BLKID_SUBLKS_USAGE
|BLKID_SUBLKS_UUID
);
627 blkid_probe_enable_partitions(b
, 1);
628 blkid_probe_set_partitions_flags(b
, BLKID_PARTS_ENTRY_DETAILS
);
631 r
= blkid_do_safeprobe(b
);
632 if (r
== _BLKID_SAFEPROBE_ERROR
)
633 return errno_or_else(EIO
);
634 if (IN_SET(r
, _BLKID_SAFEPROBE_AMBIGUOUS
, _BLKID_SAFEPROBE_NOT_FOUND
))
635 return log_debug_errno(SYNTHETIC_ERRNO(ENOPKG
), "Failed to identify any partition table.");
637 assert(r
== _BLKID_SAFEPROBE_FOUND
);
639 if ((!(flags
& DISSECT_IMAGE_GPT_ONLY
) &&
640 (flags
& DISSECT_IMAGE_GENERIC_ROOT
)) ||
641 (flags
& DISSECT_IMAGE_NO_PARTITION_TABLE
)) {
642 const char *usage
= NULL
;
644 /* If flags permit this, also allow using non-partitioned single-filesystem images */
646 (void) blkid_probe_lookup_value(b
, "USAGE", &usage
, NULL
);
647 if (STRPTR_IN_SET(usage
, "filesystem", "crypto")) {
648 _cleanup_free_
char *t
= NULL
, *n
= NULL
, *o
= NULL
;
649 const char *fstype
= NULL
, *options
= NULL
, *suuid
= NULL
;
650 _cleanup_close_
int mount_node_fd
= -EBADF
;
651 sd_id128_t uuid
= SD_ID128_NULL
;
653 if (FLAGS_SET(flags
, DISSECT_IMAGE_PIN_PARTITION_DEVICES
)) {
654 mount_node_fd
= open_partition(devname
, /* is_partition = */ false, m
->loop
);
655 if (mount_node_fd
< 0)
656 return mount_node_fd
;
659 /* OK, we have found a file system, that's our root partition then. */
660 (void) blkid_probe_lookup_value(b
, "TYPE", &fstype
, NULL
);
661 (void) blkid_probe_lookup_value(b
, "UUID", &suuid
, NULL
);
670 /* blkid will return FAT's serial number as UUID, hence it is quite possible
671 * that parsing this will fail. We'll ignore the ID, since it's just too
672 * short to be useful as tru identifier. */
673 r
= sd_id128_from_string(suuid
, &uuid
);
675 log_debug_errno(r
, "Failed to parse file system UUID '%s', ignoring: %m", suuid
);
678 r
= make_partition_devname(devname
, diskseq
, -1, flags
, &n
);
682 m
->single_file_system
= true;
683 m
->encrypted
= streq_ptr(fstype
, "crypto_LUKS");
685 m
->has_verity
= verity
&& verity
->data_path
;
686 m
->verity_ready
= verity_settings_data_covers(verity
, PARTITION_ROOT
);
688 m
->has_verity_sig
= false; /* signature not embedded, must be specified */
689 m
->verity_sig_ready
= m
->verity_ready
&& verity
->root_hash_sig
;
691 m
->image_uuid
= uuid
;
693 options
= mount_options_from_designator(mount_options
, PARTITION_ROOT
);
700 m
->partitions
[PARTITION_ROOT
] = (DissectedPartition
) {
702 .rw
= !m
->verity_ready
&& !fstype_is_ro(fstype
),
704 .architecture
= _ARCHITECTURE_INVALID
,
705 .fstype
= TAKE_PTR(t
),
707 .mount_options
= TAKE_PTR(o
),
708 .mount_node_fd
= TAKE_FD(mount_node_fd
),
717 (void) blkid_probe_lookup_value(b
, "PTTYPE", &pttype
, NULL
);
721 is_gpt
= streq_ptr(pttype
, "gpt");
722 is_mbr
= streq_ptr(pttype
, "dos");
724 if (!is_gpt
&& ((flags
& DISSECT_IMAGE_GPT_ONLY
) || !is_mbr
))
727 /* We support external verity data partitions only if the image has no partition table */
728 if (verity
&& verity
->data_path
)
731 if (FLAGS_SET(flags
, DISSECT_IMAGE_ADD_PARTITION_DEVICES
)) {
732 /* Safety check: refuse block devices that carry a partition table but for which the kernel doesn't
733 * do partition scanning. */
734 r
= blockdev_partscan_enabled(fd
);
738 return -EPROTONOSUPPORT
;
741 (void) blkid_probe_lookup_value(b
, "PTUUID", &sptuuid
, NULL
);
743 r
= sd_id128_from_string(sptuuid
, &m
->image_uuid
);
745 log_debug_errno(r
, "Failed to parse partition table UUID '%s', ignoring: %m", sptuuid
);
749 pl
= blkid_probe_get_partitions(b
);
751 return errno_or_else(ENOMEM
);
754 n_partitions
= blkid_partlist_numof_partitions(pl
);
755 if (n_partitions
< 0)
756 return errno_or_else(EIO
);
758 for (int i
= 0; i
< n_partitions
; i
++) {
759 _cleanup_free_
char *node
= NULL
;
760 unsigned long long pflags
;
761 blkid_loff_t start
, size
;
766 pp
= blkid_partlist_get_partition(pl
, i
);
768 return errno_or_else(EIO
);
770 pflags
= blkid_partition_get_flags(pp
);
773 nr
= blkid_partition_get_partno(pp
);
775 return errno_or_else(EIO
);
778 start
= blkid_partition_get_start(pp
);
780 return errno_or_else(EIO
);
782 assert((uint64_t) start
< UINT64_MAX
/512);
785 size
= blkid_partition_get_size(pp
);
787 return errno_or_else(EIO
);
789 assert((uint64_t) size
< UINT64_MAX
/512);
791 /* While probing we need the non-diskseq device node name to access the thing, hence mask off
792 * DISSECT_IMAGE_DISKSEQ_DEVNODE. */
793 r
= make_partition_devname(devname
, diskseq
, nr
, flags
& ~DISSECT_IMAGE_DISKSEQ_DEVNODE
, &node
);
797 /* So here's the thing: after the main ("whole") block device popped up it might take a while
798 * before the kernel fully probed the partition table. Waiting for that to finish is icky in
799 * userspace. So here's what we do instead. We issue the BLKPG_ADD_PARTITION ioctl to add the
800 * partition ourselves, racing against the kernel. Good thing is: if this call fails with
801 * EBUSY then the kernel was quicker than us, and that's totally OK, the outcome is good for
802 * us: the device node will exist. If OTOH our call was successful we won the race. Which is
803 * also good as the outcome is the same: the partition block device exists, and we can use
806 * Kernel returns EBUSY if there's already a partition by that number or an overlapping
807 * partition already existent. */
809 if (FLAGS_SET(flags
, DISSECT_IMAGE_ADD_PARTITION_DEVICES
)) {
810 r
= block_device_add_partition(fd
, node
, nr
, (uint64_t) start
* 512, (uint64_t) size
* 512);
813 return log_debug_errno(r
, "BLKPG_ADD_PARTITION failed: %m");
815 log_debug_errno(r
, "Kernel was quicker than us in adding partition %i.", nr
);
817 log_debug("We were quicker than kernel in adding partition %i.", nr
);
821 const char *fstype
= NULL
, *label
;
822 sd_id128_t type_id
, id
;
823 GptPartitionType type
;
824 bool rw
= true, growfs
= false;
826 r
= blkid_partition_get_uuid_id128(pp
, &id
);
828 log_debug_errno(r
, "Failed to read partition UUID, ignoring: %m");
832 r
= blkid_partition_get_type_id128(pp
, &type_id
);
834 log_debug_errno(r
, "Failed to read partition type UUID, ignoring: %m");
838 type
= gpt_partition_type_from_uuid(type_id
);
840 label
= blkid_partition_get_name(pp
); /* libblkid returns NULL here if empty */
842 if (IN_SET(type
.designator
,
848 check_partition_flags(node
, pflags
,
849 SD_GPT_FLAG_NO_AUTO
| SD_GPT_FLAG_READ_ONLY
| SD_GPT_FLAG_GROWFS
);
851 if (pflags
& SD_GPT_FLAG_NO_AUTO
)
854 rw
= !(pflags
& SD_GPT_FLAG_READ_ONLY
);
855 growfs
= FLAGS_SET(pflags
, SD_GPT_FLAG_GROWFS
);
857 } else if (type
.designator
== PARTITION_ESP
) {
859 /* Note that we don't check the SD_GPT_FLAG_NO_AUTO flag for the ESP, as it is
860 * not defined there. We instead check the SD_GPT_FLAG_NO_BLOCK_IO_PROTOCOL, as
861 * recommended by the UEFI spec (See "12.3.3 Number and Location of System
864 if (pflags
& SD_GPT_FLAG_NO_BLOCK_IO_PROTOCOL
)
869 } else if (type
.designator
== PARTITION_ROOT
) {
871 check_partition_flags(node
, pflags
,
872 SD_GPT_FLAG_NO_AUTO
| SD_GPT_FLAG_READ_ONLY
| SD_GPT_FLAG_GROWFS
);
874 if (pflags
& SD_GPT_FLAG_NO_AUTO
)
877 /* If a root ID is specified, ignore everything but the root id */
878 if (!sd_id128_is_null(root_uuid
) && !sd_id128_equal(root_uuid
, id
))
881 rw
= !(pflags
& SD_GPT_FLAG_READ_ONLY
);
882 growfs
= FLAGS_SET(pflags
, SD_GPT_FLAG_GROWFS
);
884 } else if (type
.designator
== PARTITION_ROOT_VERITY
) {
886 check_partition_flags(node
, pflags
,
887 SD_GPT_FLAG_NO_AUTO
| SD_GPT_FLAG_READ_ONLY
);
889 if (pflags
& SD_GPT_FLAG_NO_AUTO
)
892 m
->has_verity
= true;
894 /* If no verity configuration is specified, then don't do verity */
897 if (verity
->designator
>= 0 && verity
->designator
!= PARTITION_ROOT
)
900 /* If root hash is specified, then ignore everything but the root id */
901 if (!sd_id128_is_null(root_verity_uuid
) && !sd_id128_equal(root_verity_uuid
, id
))
904 fstype
= "DM_verity_hash";
907 } else if (type
.designator
== PARTITION_ROOT_VERITY_SIG
) {
909 check_partition_flags(node
, pflags
,
910 SD_GPT_FLAG_NO_AUTO
| SD_GPT_FLAG_READ_ONLY
);
912 if (pflags
& SD_GPT_FLAG_NO_AUTO
)
915 m
->has_verity_sig
= true;
919 if (verity
->designator
>= 0 && verity
->designator
!= PARTITION_ROOT
)
922 fstype
= "verity_hash_signature";
925 } else if (type
.designator
== PARTITION_USR
) {
927 check_partition_flags(node
, pflags
,
928 SD_GPT_FLAG_NO_AUTO
| SD_GPT_FLAG_READ_ONLY
| SD_GPT_FLAG_GROWFS
);
930 if (pflags
& SD_GPT_FLAG_NO_AUTO
)
933 /* If a usr ID is specified, ignore everything but the usr id */
934 if (!sd_id128_is_null(usr_uuid
) && !sd_id128_equal(usr_uuid
, id
))
937 rw
= !(pflags
& SD_GPT_FLAG_READ_ONLY
);
938 growfs
= FLAGS_SET(pflags
, SD_GPT_FLAG_GROWFS
);
940 } else if (type
.designator
== PARTITION_USR_VERITY
) {
942 check_partition_flags(node
, pflags
,
943 SD_GPT_FLAG_NO_AUTO
| SD_GPT_FLAG_READ_ONLY
);
945 if (pflags
& SD_GPT_FLAG_NO_AUTO
)
948 m
->has_verity
= true;
952 if (verity
->designator
>= 0 && verity
->designator
!= PARTITION_USR
)
955 /* If usr hash is specified, then ignore everything but the usr id */
956 if (!sd_id128_is_null(usr_verity_uuid
) && !sd_id128_equal(usr_verity_uuid
, id
))
959 fstype
= "DM_verity_hash";
962 } else if (type
.designator
== PARTITION_USR_VERITY_SIG
) {
964 check_partition_flags(node
, pflags
,
965 SD_GPT_FLAG_NO_AUTO
| SD_GPT_FLAG_READ_ONLY
);
967 if (pflags
& SD_GPT_FLAG_NO_AUTO
)
970 m
->has_verity_sig
= true;
974 if (verity
->designator
>= 0 && verity
->designator
!= PARTITION_USR
)
977 fstype
= "verity_hash_signature";
980 } else if (type
.designator
== PARTITION_SWAP
) {
982 check_partition_flags(node
, pflags
, SD_GPT_FLAG_NO_AUTO
);
984 if (pflags
& SD_GPT_FLAG_NO_AUTO
)
987 /* Note: we don't set fstype = "swap" here, because we still need to probe if
988 * it might be encrypted (i.e. fstype "crypt_LUKS") or unencrypted
989 * (i.e. fstype "swap"), and the only way to figure that out is via fstype
992 /* We don't have a designator for SD_GPT_LINUX_GENERIC so check the UUID instead. */
993 } else if (sd_id128_equal(type
.uuid
, SD_GPT_LINUX_GENERIC
)) {
995 check_partition_flags(node
, pflags
,
996 SD_GPT_FLAG_NO_AUTO
| SD_GPT_FLAG_READ_ONLY
| SD_GPT_FLAG_GROWFS
);
998 if (pflags
& SD_GPT_FLAG_NO_AUTO
)
1002 multiple_generic
= true;
1005 generic_rw
= !(pflags
& SD_GPT_FLAG_READ_ONLY
);
1006 generic_growfs
= FLAGS_SET(pflags
, SD_GPT_FLAG_GROWFS
);
1008 generic_node
= TAKE_PTR(node
);
1011 } else if (type
.designator
== PARTITION_VAR
) {
1013 check_partition_flags(node
, pflags
,
1014 SD_GPT_FLAG_NO_AUTO
| SD_GPT_FLAG_READ_ONLY
| SD_GPT_FLAG_GROWFS
);
1016 if (pflags
& SD_GPT_FLAG_NO_AUTO
)
1019 if (!FLAGS_SET(flags
, DISSECT_IMAGE_RELAX_VAR_CHECK
)) {
1020 sd_id128_t var_uuid
;
1022 /* For /var we insist that the uuid of the partition matches the
1023 * HMAC-SHA256 of the /var GPT partition type uuid, keyed by machine
1024 * ID. Why? Unlike the other partitions /var is inherently
1025 * installation specific, hence we need to be careful not to mount it
1026 * in the wrong installation. By hashing the partition UUID from
1027 * /etc/machine-id we can securely bind the partition to the
1030 r
= sd_id128_get_machine_app_specific(SD_GPT_VAR
, &var_uuid
);
1034 if (!sd_id128_equal(var_uuid
, id
)) {
1035 log_debug("Found a /var/ partition, but its UUID didn't match our expectations "
1036 "(found: " SD_ID128_UUID_FORMAT_STR
", expected: " SD_ID128_UUID_FORMAT_STR
"), ignoring.",
1037 SD_ID128_FORMAT_VAL(id
), SD_ID128_FORMAT_VAL(var_uuid
));
1042 rw
= !(pflags
& SD_GPT_FLAG_READ_ONLY
);
1043 growfs
= FLAGS_SET(pflags
, SD_GPT_FLAG_GROWFS
);
1046 if (type
.designator
!= _PARTITION_DESIGNATOR_INVALID
) {
1047 _cleanup_free_
char *t
= NULL
, *o
= NULL
, *l
= NULL
, *n
= NULL
;
1048 _cleanup_close_
int mount_node_fd
= -EBADF
;
1049 const char *options
= NULL
;
1051 if (m
->partitions
[type
.designator
].found
) {
1052 /* For most partition types the first one we see wins. Except for the
1053 * rootfs and /usr, where we do a version compare of the label, and
1054 * let the newest version win. This permits a simple A/B versioning
1055 * scheme in OS images. */
1057 if (compare_arch(type
.arch
, m
->partitions
[type
.designator
].architecture
) <= 0)
1060 if (!partition_designator_is_versioned(type
.designator
) ||
1061 strverscmp_improved(m
->partitions
[type
.designator
].label
, label
) >= 0)
1064 dissected_partition_done(m
->partitions
+ type
.designator
);
1067 if (FLAGS_SET(flags
, DISSECT_IMAGE_PIN_PARTITION_DEVICES
) &&
1068 type
.designator
!= PARTITION_SWAP
) {
1069 mount_node_fd
= open_partition(node
, /* is_partition = */ true, m
->loop
);
1070 if (mount_node_fd
< 0)
1071 return mount_node_fd
;
1074 r
= make_partition_devname(devname
, diskseq
, nr
, flags
, &n
);
1090 options
= mount_options_from_designator(mount_options
, type
.designator
);
1092 o
= strdup(options
);
1097 m
->partitions
[type
.designator
] = (DissectedPartition
) {
1102 .architecture
= type
.arch
,
1103 .node
= TAKE_PTR(n
),
1104 .fstype
= TAKE_PTR(t
),
1105 .label
= TAKE_PTR(l
),
1107 .mount_options
= TAKE_PTR(o
),
1108 .mount_node_fd
= TAKE_FD(mount_node_fd
),
1109 .offset
= (uint64_t) start
* 512,
1110 .size
= (uint64_t) size
* 512,
1111 .gpt_flags
= pflags
,
1115 } else if (is_mbr
) {
1117 switch (blkid_partition_get_type(pp
)) {
1119 case 0x83: /* Linux partition */
1121 if (pflags
!= 0x80) /* Bootable flag */
1125 multiple_generic
= true;
1129 generic_growfs
= false;
1130 generic_node
= TAKE_PTR(node
);
1135 case 0xEA: { /* Boot Loader Spec extended $BOOT partition */
1136 _cleanup_close_
int mount_node_fd
= -EBADF
;
1137 _cleanup_free_
char *o
= NULL
, *n
= NULL
;
1138 sd_id128_t id
= SD_ID128_NULL
;
1139 const char *options
= NULL
;
1141 /* First one wins */
1142 if (m
->partitions
[PARTITION_XBOOTLDR
].found
)
1145 if (FLAGS_SET(flags
, DISSECT_IMAGE_PIN_PARTITION_DEVICES
)) {
1146 mount_node_fd
= open_partition(node
, /* is_partition = */ true, m
->loop
);
1147 if (mount_node_fd
< 0)
1148 return mount_node_fd
;
1151 (void) blkid_partition_get_uuid_id128(pp
, &id
);
1153 r
= make_partition_devname(devname
, diskseq
, nr
, flags
, &n
);
1157 options
= mount_options_from_designator(mount_options
, PARTITION_XBOOTLDR
);
1159 o
= strdup(options
);
1164 m
->partitions
[PARTITION_XBOOTLDR
] = (DissectedPartition
) {
1169 .architecture
= _ARCHITECTURE_INVALID
,
1170 .node
= TAKE_PTR(n
),
1172 .mount_options
= TAKE_PTR(o
),
1173 .mount_node_fd
= TAKE_FD(mount_node_fd
),
1174 .offset
= (uint64_t) start
* 512,
1175 .size
= (uint64_t) size
* 512,
1183 if (!m
->partitions
[PARTITION_ROOT
].found
&&
1184 (m
->partitions
[PARTITION_ROOT_VERITY
].found
||
1185 m
->partitions
[PARTITION_ROOT_VERITY_SIG
].found
))
1186 return -EADDRNOTAVAIL
; /* Verity found but no matching rootfs? Something is off, refuse. */
1188 /* Hmm, we found a signature partition but no Verity data? Something is off. */
1189 if (m
->partitions
[PARTITION_ROOT_VERITY_SIG
].found
&& !m
->partitions
[PARTITION_ROOT_VERITY
].found
)
1190 return -EADDRNOTAVAIL
;
1192 if (!m
->partitions
[PARTITION_USR
].found
&&
1193 (m
->partitions
[PARTITION_USR_VERITY
].found
||
1194 m
->partitions
[PARTITION_USR_VERITY_SIG
].found
))
1195 return -EADDRNOTAVAIL
; /* as above */
1198 if (m
->partitions
[PARTITION_USR_VERITY_SIG
].found
&& !m
->partitions
[PARTITION_USR_VERITY
].found
)
1199 return -EADDRNOTAVAIL
;
1201 /* If root and /usr are combined then insist that the architecture matches */
1202 if (m
->partitions
[PARTITION_ROOT
].found
&&
1203 m
->partitions
[PARTITION_USR
].found
&&
1204 (m
->partitions
[PARTITION_ROOT
].architecture
>= 0 &&
1205 m
->partitions
[PARTITION_USR
].architecture
>= 0 &&
1206 m
->partitions
[PARTITION_ROOT
].architecture
!= m
->partitions
[PARTITION_USR
].architecture
))
1207 return -EADDRNOTAVAIL
;
1209 if (!m
->partitions
[PARTITION_ROOT
].found
&&
1210 !m
->partitions
[PARTITION_USR
].found
&&
1211 (flags
& DISSECT_IMAGE_GENERIC_ROOT
) &&
1212 (!verity
|| !verity
->root_hash
|| verity
->designator
!= PARTITION_USR
)) {
1214 /* OK, we found nothing usable, then check if there's a single generic partition, and use
1215 * that. If the root hash was set however, then we won't fall back to a generic node, because
1216 * the root hash decides. */
1218 /* If we didn't find a properly marked root partition, but we did find a single suitable
1219 * generic Linux partition, then use this as root partition, if the caller asked for it. */
1220 if (multiple_generic
)
1223 /* If we didn't find a generic node, then we can't fix this up either */
1225 _cleanup_close_
int mount_node_fd
= -EBADF
;
1226 _cleanup_free_
char *o
= NULL
, *n
= NULL
;
1227 const char *options
;
1229 if (FLAGS_SET(flags
, DISSECT_IMAGE_PIN_PARTITION_DEVICES
)) {
1230 mount_node_fd
= open_partition(generic_node
, /* is_partition = */ true, m
->loop
);
1231 if (mount_node_fd
< 0)
1232 return mount_node_fd
;
1235 r
= make_partition_devname(devname
, diskseq
, generic_nr
, flags
, &n
);
1239 options
= mount_options_from_designator(mount_options
, PARTITION_ROOT
);
1241 o
= strdup(options
);
1246 assert(generic_nr
>= 0);
1247 m
->partitions
[PARTITION_ROOT
] = (DissectedPartition
) {
1250 .growfs
= generic_growfs
,
1251 .partno
= generic_nr
,
1252 .architecture
= _ARCHITECTURE_INVALID
,
1253 .node
= TAKE_PTR(n
),
1254 .uuid
= generic_uuid
,
1255 .mount_options
= TAKE_PTR(o
),
1256 .mount_node_fd
= TAKE_FD(mount_node_fd
),
1257 .offset
= UINT64_MAX
,
1263 /* Check if we have a root fs if we are told to do check. /usr alone is fine too, but only if appropriate flag for that is set too */
1264 if (FLAGS_SET(flags
, DISSECT_IMAGE_REQUIRE_ROOT
) &&
1265 !(m
->partitions
[PARTITION_ROOT
].found
|| (m
->partitions
[PARTITION_USR
].found
&& FLAGS_SET(flags
, DISSECT_IMAGE_USR_NO_ROOT
))))
1268 if (m
->partitions
[PARTITION_ROOT_VERITY
].found
) {
1269 /* We only support one verity partition per image, i.e. can't do for both /usr and root fs */
1270 if (m
->partitions
[PARTITION_USR_VERITY
].found
)
1273 /* We don't support verity enabled root with a split out /usr. Neither with nor without
1274 * verity there. (Note that we do support verity-less root with verity-full /usr, though.) */
1275 if (m
->partitions
[PARTITION_USR
].found
)
1276 return -EADDRNOTAVAIL
;
1280 /* If a verity designator is specified, then insist that the matching partition exists */
1281 if (verity
->designator
>= 0 && !m
->partitions
[verity
->designator
].found
)
1282 return -EADDRNOTAVAIL
;
1284 bool have_verity_sig_partition
=
1285 m
->partitions
[verity
->designator
== PARTITION_USR
? PARTITION_USR_VERITY_SIG
: PARTITION_ROOT_VERITY_SIG
].found
;
1287 if (verity
->root_hash
) {
1288 /* If we have an explicit root hash and found the partitions for it, then we are ready to use
1289 * Verity, set things up for it */
1291 if (verity
->designator
< 0 || verity
->designator
== PARTITION_ROOT
) {
1292 if (!m
->partitions
[PARTITION_ROOT_VERITY
].found
|| !m
->partitions
[PARTITION_ROOT
].found
)
1293 return -EADDRNOTAVAIL
;
1295 /* If we found a verity setup, then the root partition is necessarily read-only. */
1296 m
->partitions
[PARTITION_ROOT
].rw
= false;
1297 m
->verity_ready
= true;
1300 assert(verity
->designator
== PARTITION_USR
);
1302 if (!m
->partitions
[PARTITION_USR_VERITY
].found
|| !m
->partitions
[PARTITION_USR
].found
)
1303 return -EADDRNOTAVAIL
;
1305 m
->partitions
[PARTITION_USR
].rw
= false;
1306 m
->verity_ready
= true;
1309 if (m
->verity_ready
)
1310 m
->verity_sig_ready
= verity
->root_hash_sig
|| have_verity_sig_partition
;
1312 } else if (have_verity_sig_partition
) {
1314 /* If we found an embedded signature partition, we are ready, too. */
1316 m
->verity_ready
= m
->verity_sig_ready
= true;
1317 m
->partitions
[verity
->designator
== PARTITION_USR
? PARTITION_USR
: PARTITION_ROOT
].rw
= false;
1321 r
= dissected_image_probe_filesystems(m
, fd
);
1329 int dissect_image_file(
1331 const VeritySettings
*verity
,
1332 const MountOptions
*mount_options
,
1333 DissectImageFlags flags
,
1334 DissectedImage
**ret
) {
1337 _cleanup_(dissected_image_unrefp
) DissectedImage
*m
= NULL
;
1338 _cleanup_close_
int fd
= -EBADF
;
1344 fd
= open(path
, O_RDONLY
|O_CLOEXEC
|O_NONBLOCK
|O_NOCTTY
);
1348 r
= fd_verify_regular(fd
);
1352 r
= dissected_image_new(path
, &m
);
1356 r
= probe_sector_size(fd
, &m
->sector_size
);
1360 r
= dissect_image(m
, fd
, path
, verity
, mount_options
, flags
);
1371 DissectedImage
* dissected_image_unref(DissectedImage
*m
) {
1375 /* First, clear dissected partitions. */
1376 for (PartitionDesignator i
= 0; i
< _PARTITION_DESIGNATOR_MAX
; i
++)
1377 dissected_partition_done(m
->partitions
+ i
);
1379 /* Second, free decrypted images. This must be after dissected_partition_done(), as freeing
1380 * DecryptedImage may try to deactivate partitions. */
1381 decrypted_image_unref(m
->decrypted_image
);
1383 /* Third, unref LoopDevice. This must be called after the above two, as freeing LoopDevice may try to
1384 * remove existing partitions on the loopback block device. */
1385 loop_device_unref(m
->loop
);
1387 free(m
->image_name
);
1389 strv_free(m
->machine_info
);
1390 strv_free(m
->os_release
);
1391 strv_free(m
->initrd_release
);
1392 strv_free(m
->extension_release
);
1397 static int is_loop_device(const char *path
) {
1398 char s
[SYS_BLOCK_PATH_MAX("/../loop/")];
1403 if (stat(path
, &st
) < 0)
1406 if (!S_ISBLK(st
.st_mode
))
1409 xsprintf_sys_block_path(s
, "/loop/", st
.st_dev
);
1410 if (access(s
, F_OK
) < 0) {
1411 if (errno
!= ENOENT
)
1414 /* The device itself isn't a loop device, but maybe it's a partition and its parent is? */
1415 xsprintf_sys_block_path(s
, "/../loop/", st
.st_dev
);
1416 if (access(s
, F_OK
) < 0)
1417 return errno
== ENOENT
? false : -errno
;
1423 static int run_fsck(int node_fd
, const char *fstype
) {
1427 assert(node_fd
>= 0);
1430 r
= fsck_exists_for_fstype(fstype
);
1432 log_debug_errno(r
, "Couldn't determine whether fsck for %s exists, proceeding anyway.", fstype
);
1436 log_debug("Not checking partition %s, as fsck for %s does not exist.", FORMAT_PROC_FD_PATH(node_fd
), fstype
);
1443 &node_fd
, 1, /* Leave the node fd open */
1444 FORK_RESET_SIGNALS
|FORK_CLOSE_ALL_FDS
|FORK_RLIMIT_NOFILE_SAFE
|FORK_DEATHSIG
|FORK_REARRANGE_STDIO
|FORK_CLOEXEC_OFF
,
1447 return log_debug_errno(r
, "Failed to fork off fsck: %m");
1450 execl("/sbin/fsck", "/sbin/fsck", "-aT", FORMAT_PROC_FD_PATH(node_fd
), NULL
);
1452 log_debug_errno(errno
, "Failed to execl() fsck: %m");
1453 _exit(FSCK_OPERATIONAL_ERROR
);
1456 exit_status
= wait_for_terminate_and_check("fsck", pid
, 0);
1457 if (exit_status
< 0)
1458 return log_debug_errno(exit_status
, "Failed to fork off /sbin/fsck: %m");
1460 if ((exit_status
& ~FSCK_ERROR_CORRECTED
) != FSCK_SUCCESS
) {
1461 log_debug("fsck failed with exit status %i.", exit_status
);
1463 if ((exit_status
& (FSCK_SYSTEM_SHOULD_REBOOT
|FSCK_ERRORS_LEFT_UNCORRECTED
)) != 0)
1464 return log_debug_errno(SYNTHETIC_ERRNO(EUCLEAN
), "File system is corrupted, refusing.");
1466 log_debug("Ignoring fsck error.");
1472 static int fs_grow(const char *node_path
, const char *mount_path
) {
1473 _cleanup_close_
int mount_fd
= -EBADF
, node_fd
= -EBADF
;
1474 uint64_t size
, newsize
;
1477 node_fd
= open(node_path
, O_RDONLY
|O_CLOEXEC
|O_NONBLOCK
|O_NOCTTY
);
1479 return log_debug_errno(errno
, "Failed to open node device %s: %m", node_path
);
1481 if (ioctl(node_fd
, BLKGETSIZE64
, &size
) != 0)
1482 return log_debug_errno(errno
, "Failed to get block device size of %s: %m", node_path
);
1484 mount_fd
= open(mount_path
, O_RDONLY
|O_DIRECTORY
|O_CLOEXEC
);
1486 return log_debug_errno(errno
, "Failed to open mountd file system %s: %m", mount_path
);
1488 log_debug("Resizing \"%s\" to %"PRIu64
" bytes...", mount_path
, size
);
1489 r
= resize_fs(mount_fd
, size
, &newsize
);
1491 return log_debug_errno(r
, "Failed to resize \"%s\" to %"PRIu64
" bytes: %m", mount_path
, size
);
1493 if (newsize
== size
)
1494 log_debug("Successfully resized \"%s\" to %s bytes.",
1495 mount_path
, FORMAT_BYTES(newsize
));
1497 assert(newsize
< size
);
1498 log_debug("Successfully resized \"%s\" to %s bytes (%"PRIu64
" bytes lost due to blocksize).",
1499 mount_path
, FORMAT_BYTES(newsize
), size
- newsize
);
1505 static int mount_partition(
1506 DissectedPartition
*m
,
1508 const char *directory
,
1511 DissectImageFlags flags
) {
1513 _cleanup_free_
char *chased
= NULL
, *options
= NULL
;
1514 const char *p
, *node
, *fstype
;
1515 bool rw
, remap_uid_gid
= false;
1521 if (m
->mount_node_fd
< 0)
1524 /* Use decrypted node and matching fstype if available, otherwise use the original device */
1525 node
= FORMAT_PROC_FD_PATH(m
->mount_node_fd
);
1526 fstype
= dissected_partition_fstype(m
);
1529 return -EAFNOSUPPORT
;
1530 r
= dissect_fstype_ok(fstype
);
1534 return -EIDRM
; /* Recognizable error */
1536 /* We are looking at an encrypted partition? This either means stacked encryption, or the caller
1537 * didn't call dissected_image_decrypt() beforehand. Let's return a recognizable error for this
1539 if (streq(fstype
, "crypto_LUKS"))
1542 rw
= m
->rw
&& !(flags
& DISSECT_IMAGE_MOUNT_READ_ONLY
);
1544 if (FLAGS_SET(flags
, DISSECT_IMAGE_FSCK
) && rw
) {
1545 r
= run_fsck(m
->mount_node_fd
, fstype
);
1551 /* Automatically create missing mount points inside the image, if necessary. */
1552 r
= mkdir_p_root(where
, directory
, uid_shift
, (gid_t
) uid_shift
, 0755);
1553 if (r
< 0 && r
!= -EROFS
)
1556 r
= chase_symlinks(directory
, where
, CHASE_PREFIX_ROOT
, &chased
, NULL
);
1562 /* Create top-level mount if missing – but only if this is asked for. This won't modify the
1563 * image (as the branch above does) but the host hierarchy, and the created directory might
1564 * survive our mount in the host hierarchy hence. */
1565 if (FLAGS_SET(flags
, DISSECT_IMAGE_MKDIR
)) {
1566 r
= mkdir_p(where
, 0755);
1574 /* If requested, turn on discard support. */
1575 if (fstype_can_discard(fstype
) &&
1576 ((flags
& DISSECT_IMAGE_DISCARD
) ||
1577 ((flags
& DISSECT_IMAGE_DISCARD_ON_LOOP
) && is_loop_device(m
->node
) > 0))) {
1578 options
= strdup("discard");
1583 if (uid_is_valid(uid_shift
) && uid_shift
!= 0) {
1585 if (fstype_can_uid_gid(fstype
)) {
1586 _cleanup_free_
char *uid_option
= NULL
;
1588 if (asprintf(&uid_option
, "uid=" UID_FMT
",gid=" GID_FMT
, uid_shift
, (gid_t
) uid_shift
) < 0)
1591 if (!strextend_with_separator(&options
, ",", uid_option
))
1593 } else if (FLAGS_SET(flags
, DISSECT_IMAGE_MOUNT_IDMAPPED
))
1594 remap_uid_gid
= true;
1597 if (!isempty(m
->mount_options
))
1598 if (!strextend_with_separator(&options
, ",", m
->mount_options
))
1601 /* So, when you request MS_RDONLY from ext4, then this means nothing. It happily still writes to the
1602 * backing storage. What's worse, the BLKRO[GS]ET flag and (in case of loopback devices)
1603 * LO_FLAGS_READ_ONLY don't mean anything, they affect userspace accesses only, and write accesses
1604 * from the upper file system still get propagated through to the underlying file system,
1605 * unrestricted. To actually get ext4/xfs/btrfs to stop writing to the device we need to specify
1606 * "norecovery" as mount option, in addition to MS_RDONLY. Yes, this sucks, since it means we need to
1607 * carry a per file system table here.
1609 * Note that this means that we might not be able to mount corrupted file systems as read-only
1610 * anymore (since in some cases the kernel implementations will refuse mounting when corrupted,
1611 * read-only and "norecovery" is specified). But I think for the case of automatically determined
1612 * mount options for loopback devices this is the right choice, since otherwise using the same
1613 * loopback file twice even in read-only mode, is going to fail badly sooner or later. The usecase of
1614 * making reuse of the immutable images "just work" is more relevant to us than having read-only
1615 * access that actually modifies stuff work on such image files. Or to say this differently: if
1616 * people want their file systems to be fixed up they should just open them in writable mode, where
1617 * all these problems don't exist. */
1618 if (!rw
&& STRPTR_IN_SET(fstype
, "ext3", "ext4", "xfs", "btrfs"))
1619 if (!strextend_with_separator(&options
, ",", "norecovery"))
1622 r
= mount_nofollow_verbose(LOG_DEBUG
, node
, p
, fstype
, MS_NODEV
|(rw
? 0 : MS_RDONLY
), options
);
1626 if (rw
&& m
->growfs
&& FLAGS_SET(flags
, DISSECT_IMAGE_GROWFS
))
1627 (void) fs_grow(node
, p
);
1629 if (remap_uid_gid
) {
1630 r
= remount_idmap(p
, uid_shift
, uid_range
, UID_INVALID
, REMOUNT_IDMAPPING_HOST_ROOT
);
1638 static int mount_root_tmpfs(const char *where
, uid_t uid_shift
, DissectImageFlags flags
) {
1639 _cleanup_free_
char *options
= NULL
;
1644 /* For images that contain /usr/ but no rootfs, let's mount rootfs as tmpfs */
1646 if (FLAGS_SET(flags
, DISSECT_IMAGE_MKDIR
)) {
1647 r
= mkdir_p(where
, 0755);
1652 if (uid_is_valid(uid_shift
)) {
1653 if (asprintf(&options
, "uid=" UID_FMT
",gid=" GID_FMT
, uid_shift
, (gid_t
) uid_shift
) < 0)
1657 r
= mount_nofollow_verbose(LOG_DEBUG
, "rootfs", where
, "tmpfs", MS_NODEV
, options
);
1664 int dissected_image_mount(
1669 DissectImageFlags flags
) {
1671 int r
, xbootldr_mounted
;
1678 * -ENXIO → No root partition found
1679 * -EMEDIUMTYPE → DISSECT_IMAGE_VALIDATE_OS set but no os-release/extension-release file found
1680 * -EUNATCH → Encrypted partition found for which no dm-crypt was set up yet
1681 * -EUCLEAN → fsck for file system failed
1682 * -EBUSY → File system already mounted/used elsewhere (kernel)
1683 * -EAFNOSUPPORT → File system type not supported or not known
1684 * -EIDRM → File system is not among allowlisted "common" file systems
1687 if (!(m
->partitions
[PARTITION_ROOT
].found
||
1688 (m
->partitions
[PARTITION_USR
].found
&& FLAGS_SET(flags
, DISSECT_IMAGE_USR_NO_ROOT
))))
1689 return -ENXIO
; /* Require a root fs or at least a /usr/ fs (the latter is subject to a flag of its own) */
1691 if ((flags
& DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY
) == 0) {
1693 /* First mount the root fs. If there's none we use a tmpfs. */
1694 if (m
->partitions
[PARTITION_ROOT
].found
)
1695 r
= mount_partition(m
->partitions
+ PARTITION_ROOT
, where
, NULL
, uid_shift
, uid_range
, flags
);
1697 r
= mount_root_tmpfs(where
, uid_shift
, flags
);
1701 /* For us mounting root always means mounting /usr as well */
1702 r
= mount_partition(m
->partitions
+ PARTITION_USR
, where
, "/usr", uid_shift
, uid_range
, flags
);
1706 if ((flags
& (DISSECT_IMAGE_VALIDATE_OS
|DISSECT_IMAGE_VALIDATE_OS_EXT
)) != 0) {
1707 /* If either one of the validation flags are set, ensure that the image qualifies
1708 * as one or the other (or both). */
1711 if (FLAGS_SET(flags
, DISSECT_IMAGE_VALIDATE_OS
)) {
1712 r
= path_is_os_tree(where
);
1718 if (!ok
&& FLAGS_SET(flags
, DISSECT_IMAGE_VALIDATE_OS_EXT
)) {
1719 r
= path_is_extension_tree(where
, m
->image_name
, FLAGS_SET(flags
, DISSECT_IMAGE_RELAX_SYSEXT_CHECK
));
1731 if (flags
& DISSECT_IMAGE_MOUNT_ROOT_ONLY
)
1734 r
= mount_partition(m
->partitions
+ PARTITION_HOME
, where
, "/home", uid_shift
, uid_range
, flags
);
1738 r
= mount_partition(m
->partitions
+ PARTITION_SRV
, where
, "/srv", uid_shift
, uid_range
, flags
);
1742 r
= mount_partition(m
->partitions
+ PARTITION_VAR
, where
, "/var", uid_shift
, uid_range
, flags
);
1746 r
= mount_partition(m
->partitions
+ PARTITION_TMP
, where
, "/var/tmp", uid_shift
, uid_range
, flags
);
1750 xbootldr_mounted
= mount_partition(m
->partitions
+ PARTITION_XBOOTLDR
, where
, "/boot", uid_shift
, uid_range
, flags
);
1751 if (xbootldr_mounted
< 0)
1752 return xbootldr_mounted
;
1754 if (m
->partitions
[PARTITION_ESP
].found
) {
1755 int esp_done
= false;
1757 /* Mount the ESP to /efi if it exists. If it doesn't exist, use /boot instead, but only if it
1758 * exists and is empty, and we didn't already mount the XBOOTLDR partition into it. */
1760 r
= chase_symlinks("/efi", where
, CHASE_PREFIX_ROOT
, NULL
, NULL
);
1765 /* /efi doesn't exist. Let's see if /boot is suitable then */
1767 if (!xbootldr_mounted
) {
1768 _cleanup_free_
char *p
= NULL
;
1770 r
= chase_symlinks("/boot", where
, CHASE_PREFIX_ROOT
, &p
, NULL
);
1774 } else if (dir_is_empty(p
, /* ignore_hidden_or_backup= */ false) > 0) {
1775 /* It exists and is an empty directory. Let's mount the ESP there. */
1776 r
= mount_partition(m
->partitions
+ PARTITION_ESP
, where
, "/boot", uid_shift
, uid_range
, flags
);
1786 /* OK, let's mount the ESP now to /efi (possibly creating the dir if missing) */
1788 r
= mount_partition(m
->partitions
+ PARTITION_ESP
, where
, "/efi", uid_shift
, uid_range
, flags
);
1797 int dissected_image_mount_and_warn(
1802 DissectImageFlags flags
) {
1809 r
= dissected_image_mount(m
, where
, uid_shift
, uid_range
, flags
);
1811 return log_error_errno(r
, "Not root file system found in image.");
1812 if (r
== -EMEDIUMTYPE
)
1813 return log_error_errno(r
, "No suitable os-release/extension-release file in image found.");
1815 return log_error_errno(r
, "Encrypted file system discovered, but decryption not requested.");
1817 return log_error_errno(r
, "File system check on image failed.");
1819 return log_error_errno(r
, "File system already mounted elsewhere.");
1820 if (r
== -EAFNOSUPPORT
)
1821 return log_error_errno(r
, "File system type not supported or not known.");
1823 return log_error_errno(r
, "File system is too uncommon, refused.");
1825 return log_error_errno(r
, "Failed to mount image: %m");
1830 #if HAVE_LIBCRYPTSETUP
1831 struct DecryptedPartition
{
1832 struct crypt_device
*device
;
1838 typedef struct DecryptedPartition DecryptedPartition
;
1840 struct DecryptedImage
{
1842 DecryptedPartition
*decrypted
;
1846 static DecryptedImage
* decrypted_image_free(DecryptedImage
*d
) {
1847 #if HAVE_LIBCRYPTSETUP
1853 for (size_t i
= 0; i
< d
->n_decrypted
; i
++) {
1854 DecryptedPartition
*p
= d
->decrypted
+ i
;
1856 if (p
->device
&& p
->name
&& !p
->relinquished
) {
1857 _cleanup_free_
char *node
= NULL
;
1859 node
= path_join("/dev/mapper", p
->name
);
1861 r
= btrfs_forget_device(node
);
1862 if (r
< 0 && r
!= -ENOENT
)
1863 log_debug_errno(r
, "Failed to forget btrfs device %s, ignoring: %m", node
);
1867 /* Let's deactivate lazily, as the dm volume may be already/still used by other processes. */
1868 r
= sym_crypt_deactivate_by_name(p
->device
, p
->name
, CRYPT_DEACTIVATE_DEFERRED
);
1870 log_debug_errno(r
, "Failed to deactivate encrypted partition %s", p
->name
);
1874 sym_crypt_free(p
->device
);
1884 DEFINE_TRIVIAL_REF_UNREF_FUNC(DecryptedImage
, decrypted_image
, decrypted_image_free
);
1886 #if HAVE_LIBCRYPTSETUP
1887 static int decrypted_image_new(DecryptedImage
**ret
) {
1888 _cleanup_(decrypted_image_unrefp
) DecryptedImage
*d
= NULL
;
1892 d
= new(DecryptedImage
, 1);
1896 *d
= (DecryptedImage
) {
1904 static int make_dm_name_and_node(const void *original_node
, const char *suffix
, char **ret_name
, char **ret_node
) {
1905 _cleanup_free_
char *name
= NULL
, *node
= NULL
;
1908 assert(original_node
);
1913 base
= strrchr(original_node
, '/');
1915 base
= original_node
;
1921 name
= strjoin(base
, suffix
);
1924 if (!filename_is_valid(name
))
1927 node
= path_join(sym_crypt_get_dir(), name
);
1931 *ret_name
= TAKE_PTR(name
);
1932 *ret_node
= TAKE_PTR(node
);
1937 static int decrypt_partition(
1938 DissectedPartition
*m
,
1939 const char *passphrase
,
1940 DissectImageFlags flags
,
1941 DecryptedImage
*d
) {
1943 _cleanup_free_
char *node
= NULL
, *name
= NULL
;
1944 _cleanup_(sym_crypt_freep
) struct crypt_device
*cd
= NULL
;
1945 _cleanup_close_
int fd
= -EBADF
;
1951 if (!m
->found
|| !m
->node
|| !m
->fstype
)
1954 if (!streq(m
->fstype
, "crypto_LUKS"))
1960 r
= dlopen_cryptsetup();
1964 r
= make_dm_name_and_node(m
->node
, "-decrypted", &name
, &node
);
1968 if (!GREEDY_REALLOC0(d
->decrypted
, d
->n_decrypted
+ 1))
1971 r
= sym_crypt_init(&cd
, m
->node
);
1973 return log_debug_errno(r
, "Failed to initialize dm-crypt: %m");
1975 cryptsetup_enable_logging(cd
);
1977 r
= sym_crypt_load(cd
, CRYPT_LUKS
, NULL
);
1979 return log_debug_errno(r
, "Failed to load LUKS metadata: %m");
1981 r
= sym_crypt_activate_by_passphrase(cd
, name
, CRYPT_ANY_SLOT
, passphrase
, strlen(passphrase
),
1982 ((flags
& DISSECT_IMAGE_DEVICE_READ_ONLY
) ? CRYPT_ACTIVATE_READONLY
: 0) |
1983 ((flags
& DISSECT_IMAGE_DISCARD_ON_CRYPTO
) ? CRYPT_ACTIVATE_ALLOW_DISCARDS
: 0));
1985 log_debug_errno(r
, "Failed to activate LUKS device: %m");
1986 return r
== -EPERM
? -EKEYREJECTED
: r
;
1989 fd
= open(node
, O_RDONLY
|O_NONBLOCK
|O_CLOEXEC
|O_NOCTTY
);
1991 return log_debug_errno(errno
, "Failed to open %s: %m", node
);
1993 d
->decrypted
[d
->n_decrypted
++] = (DecryptedPartition
) {
1994 .name
= TAKE_PTR(name
),
1995 .device
= TAKE_PTR(cd
),
1998 m
->decrypted_node
= TAKE_PTR(node
);
1999 close_and_replace(m
->mount_node_fd
, fd
);
2004 static int verity_can_reuse(
2005 const VeritySettings
*verity
,
2007 struct crypt_device
**ret_cd
) {
2009 /* If the same volume was already open, check that the root hashes match, and reuse it if they do */
2010 _cleanup_free_
char *root_hash_existing
= NULL
;
2011 _cleanup_(sym_crypt_freep
) struct crypt_device
*cd
= NULL
;
2012 struct crypt_params_verity crypt_params
= {};
2013 size_t root_hash_existing_size
;
2020 r
= sym_crypt_init_by_name(&cd
, name
);
2022 return log_debug_errno(r
, "Error opening verity device, crypt_init_by_name failed: %m");
2024 cryptsetup_enable_logging(cd
);
2026 r
= sym_crypt_get_verity_info(cd
, &crypt_params
);
2028 return log_debug_errno(r
, "Error opening verity device, crypt_get_verity_info failed: %m");
2030 root_hash_existing_size
= verity
->root_hash_size
;
2031 root_hash_existing
= malloc0(root_hash_existing_size
);
2032 if (!root_hash_existing
)
2035 r
= sym_crypt_volume_key_get(cd
, CRYPT_ANY_SLOT
, root_hash_existing
, &root_hash_existing_size
, NULL
, 0);
2037 return log_debug_errno(r
, "Error opening verity device, crypt_volume_key_get failed: %m");
2038 if (verity
->root_hash_size
!= root_hash_existing_size
||
2039 memcmp(root_hash_existing
, verity
->root_hash
, verity
->root_hash_size
) != 0)
2040 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL
), "Error opening verity device, it already exists but root hashes are different.");
2042 #if HAVE_CRYPT_ACTIVATE_BY_SIGNED_KEY
2043 /* Ensure that, if signatures are supported, we only reuse the device if the previous mount used the
2044 * same settings, so that a previous unsigned mount will not be reused if the user asks to use
2045 * signing for the new one, and vice versa. */
2046 if (!!verity
->root_hash_sig
!= !!(crypt_params
.flags
& CRYPT_VERITY_ROOT_HASH_SIGNATURE
))
2047 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL
), "Error opening verity device, it already exists but signature settings are not the same.");
2050 *ret_cd
= TAKE_PTR(cd
);
2054 static inline char* dm_deferred_remove_clean(char *name
) {
2058 (void) sym_crypt_deactivate_by_name(NULL
, name
, CRYPT_DEACTIVATE_DEFERRED
);
2061 DEFINE_TRIVIAL_CLEANUP_FUNC(char *, dm_deferred_remove_clean
);
2063 static int validate_signature_userspace(const VeritySettings
*verity
) {
2065 _cleanup_(sk_X509_free_allp
) STACK_OF(X509
) *sk
= NULL
;
2066 _cleanup_strv_free_
char **certs
= NULL
;
2067 _cleanup_(PKCS7_freep
) PKCS7
*p7
= NULL
;
2068 _cleanup_free_
char *s
= NULL
;
2069 _cleanup_(BIO_freep
) BIO
*bio
= NULL
; /* 'bio' must be freed first, 's' second, hence keep this order
2070 * of declaration in place, please */
2071 const unsigned char *d
;
2075 assert(verity
->root_hash
);
2076 assert(verity
->root_hash_sig
);
2078 /* Because installing a signature certificate into the kernel chain is so messy, let's optionally do
2079 * userspace validation. */
2081 r
= conf_files_list_nulstr(&certs
, ".crt", NULL
, CONF_FILES_REGULAR
|CONF_FILES_FILTER_MASKED
, CONF_PATHS_NULSTR("verity.d"));
2083 return log_debug_errno(r
, "Failed to enumerate certificates: %m");
2084 if (strv_isempty(certs
)) {
2085 log_debug("No userspace dm-verity certificates found.");
2089 d
= verity
->root_hash_sig
;
2090 p7
= d2i_PKCS7(NULL
, &d
, (long) verity
->root_hash_sig_size
);
2092 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to parse PKCS7 DER signature data.");
2094 s
= hexmem(verity
->root_hash
, verity
->root_hash_size
);
2096 return log_oom_debug();
2098 bio
= BIO_new_mem_buf(s
, strlen(s
));
2100 return log_oom_debug();
2102 sk
= sk_X509_new_null();
2104 return log_oom_debug();
2106 STRV_FOREACH(i
, certs
) {
2107 _cleanup_(X509_freep
) X509
*c
= NULL
;
2108 _cleanup_fclose_
FILE *f
= NULL
;
2110 f
= fopen(*i
, "re");
2112 log_debug_errno(errno
, "Failed to open '%s', ignoring: %m", *i
);
2116 c
= PEM_read_X509(f
, NULL
, NULL
, NULL
);
2118 log_debug("Failed to load X509 certificate '%s', ignoring.", *i
);
2122 if (sk_X509_push(sk
, c
) == 0)
2123 return log_oom_debug();
2128 r
= PKCS7_verify(p7
, sk
, NULL
, bio
, NULL
, PKCS7_NOINTERN
|PKCS7_NOVERIFY
);
2130 log_debug("Userspace PKCS#7 validation succeeded.");
2132 log_debug("Userspace PKCS#7 validation failed: %s", ERR_error_string(ERR_get_error(), NULL
));
2136 log_debug("Not doing client-side validation of dm-verity root hash signatures, OpenSSL support disabled.");
2141 static int do_crypt_activate_verity(
2142 struct crypt_device
*cd
,
2144 const VeritySettings
*verity
) {
2146 bool check_signature
;
2153 if (verity
->root_hash_sig
) {
2154 r
= getenv_bool_secure("SYSTEMD_DISSECT_VERITY_SIGNATURE");
2155 if (r
< 0 && r
!= -ENXIO
)
2156 log_debug_errno(r
, "Failed to parse $SYSTEMD_DISSECT_VERITY_SIGNATURE");
2158 check_signature
= r
!= 0;
2160 check_signature
= false;
2162 if (check_signature
) {
2164 #if HAVE_CRYPT_ACTIVATE_BY_SIGNED_KEY
2165 /* First, if we have support for signed keys in the kernel, then try that first. */
2166 r
= sym_crypt_activate_by_signed_key(
2170 verity
->root_hash_size
,
2171 verity
->root_hash_sig
,
2172 verity
->root_hash_sig_size
,
2173 CRYPT_ACTIVATE_READONLY
);
2177 log_debug("Validation of dm-verity signature failed via the kernel, trying userspace validation instead.");
2179 log_debug("Activation of verity device with signature requested, but not supported via the kernel by %s due to missing crypt_activate_by_signed_key(), trying userspace validation instead.",
2180 program_invocation_short_name
);
2183 /* So this didn't work via the kernel, then let's try userspace validation instead. If that
2184 * works we'll try to activate without telling the kernel the signature. */
2186 r
= validate_signature_userspace(verity
);
2190 return log_debug_errno(SYNTHETIC_ERRNO(ENOKEY
),
2191 "Activation of signed Verity volume worked neither via the kernel nor in userspace, can't activate.");
2194 return sym_crypt_activate_by_volume_key(
2198 verity
->root_hash_size
,
2199 CRYPT_ACTIVATE_READONLY
);
2202 static usec_t
verity_timeout(void) {
2203 usec_t t
= 100 * USEC_PER_MSEC
;
2207 /* On slower machines, like non-KVM vm, setting up device may take a long time.
2208 * Let's make the timeout configurable. */
2210 e
= getenv("SYSTEMD_DISSECT_VERITY_TIMEOUT_SEC");
2214 r
= parse_sec(e
, &t
);
2217 "Failed to parse timeout specified in $SYSTEMD_DISSECT_VERITY_TIMEOUT_SEC, "
2218 "using the default timeout (%s).",
2219 FORMAT_TIMESPAN(t
, USEC_PER_MSEC
));
2224 static int verity_partition(
2225 PartitionDesignator designator
,
2226 DissectedPartition
*m
,
2227 DissectedPartition
*v
,
2228 const VeritySettings
*verity
,
2229 DissectImageFlags flags
,
2230 DecryptedImage
*d
) {
2232 _cleanup_(sym_crypt_freep
) struct crypt_device
*cd
= NULL
;
2233 _cleanup_(dm_deferred_remove_cleanp
) char *restore_deferred_remove
= NULL
;
2234 _cleanup_free_
char *node
= NULL
, *name
= NULL
;
2235 _cleanup_close_
int mount_node_fd
= -EBADF
;
2239 assert(v
|| (verity
&& verity
->data_path
));
2241 if (!verity
|| !verity
->root_hash
)
2243 if (!((verity
->designator
< 0 && designator
== PARTITION_ROOT
) ||
2244 (verity
->designator
== designator
)))
2247 if (!m
->found
|| !m
->node
|| !m
->fstype
)
2249 if (!verity
->data_path
) {
2250 if (!v
->found
|| !v
->node
|| !v
->fstype
)
2253 if (!streq(v
->fstype
, "DM_verity_hash"))
2257 r
= dlopen_cryptsetup();
2261 if (FLAGS_SET(flags
, DISSECT_IMAGE_VERITY_SHARE
)) {
2262 /* Use the roothash, which is unique per volume, as the device node name, so that it can be reused */
2263 _cleanup_free_
char *root_hash_encoded
= NULL
;
2265 root_hash_encoded
= hexmem(verity
->root_hash
, verity
->root_hash_size
);
2266 if (!root_hash_encoded
)
2269 r
= make_dm_name_and_node(root_hash_encoded
, "-verity", &name
, &node
);
2271 r
= make_dm_name_and_node(m
->node
, "-verity", &name
, &node
);
2275 r
= sym_crypt_init(&cd
, verity
->data_path
?: v
->node
);
2279 cryptsetup_enable_logging(cd
);
2281 r
= sym_crypt_load(cd
, CRYPT_VERITY
, NULL
);
2285 r
= sym_crypt_set_data_device(cd
, m
->node
);
2289 if (!GREEDY_REALLOC0(d
->decrypted
, d
->n_decrypted
+ 1))
2292 /* If activating fails because the device already exists, check the metadata and reuse it if it matches.
2293 * In case of ENODEV/ENOENT, which can happen if another process is activating at the exact same time,
2294 * retry a few times before giving up. */
2295 for (unsigned i
= 0; i
< N_DEVICE_NODE_LIST_ATTEMPTS
; i
++) {
2296 _cleanup_(sym_crypt_freep
) struct crypt_device
*existing_cd
= NULL
;
2297 _cleanup_close_
int fd
= -EBADF
;
2299 /* First, check if the device already exists. */
2300 fd
= open(node
, O_RDONLY
|O_NONBLOCK
|O_CLOEXEC
|O_NOCTTY
);
2301 if (fd
< 0 && !ERRNO_IS_DEVICE_ABSENT(errno
))
2302 return log_debug_errno(errno
, "Failed to open verity device %s: %m", node
);
2304 goto check
; /* The device already exists. Let's check it. */
2306 /* The symlink to the device node does not exist yet. Assume not activated, and let's activate it. */
2307 r
= do_crypt_activate_verity(cd
, name
, verity
);
2309 goto try_open
; /* The device is activated. Let's open it. */
2310 /* libdevmapper can return EINVAL when the device is already in the activation stage.
2311 * There's no way to distinguish this situation from a genuine error due to invalid
2312 * parameters, so immediately fall back to activating the device with a unique name.
2313 * Improvements in libcrypsetup can ensure this never happens:
2314 * https://gitlab.com/cryptsetup/cryptsetup/-/merge_requests/96 */
2315 if (r
== -EINVAL
&& FLAGS_SET(flags
, DISSECT_IMAGE_VERITY_SHARE
))
2317 if (r
== -ENODEV
) /* Volume is being opened but not ready, crypt_init_by_name would fail, try to open again */
2320 -EEXIST
, /* Volume has already been opened and ready to be used. */
2321 -EBUSY
/* Volume is being opened but not ready, crypt_init_by_name() can fetch details. */))
2322 return log_debug_errno(r
, "Failed to activate verity device %s: %m", node
);
2325 if (!restore_deferred_remove
){
2326 /* To avoid races, disable automatic removal on umount while setting up the new device. Restore it on failure. */
2327 r
= dm_deferred_remove_cancel(name
);
2328 /* -EBUSY and -ENXIO: the device has already been removed or being removed. We cannot
2329 * use the device, try to open again. See target_message() in drivers/md/dm-ioctl.c
2330 * and dm_cancel_deferred_remove() in drivers/md/dm.c */
2331 if (IN_SET(r
, -EBUSY
, -ENXIO
))
2334 return log_debug_errno(r
, "Failed to disable automated deferred removal for verity device %s: %m", node
);
2336 restore_deferred_remove
= strdup(name
);
2337 if (!restore_deferred_remove
)
2338 return log_oom_debug();
2341 r
= verity_can_reuse(verity
, name
, &existing_cd
);
2342 /* Same as above, -EINVAL can randomly happen when it actually means -EEXIST */
2343 if (r
== -EINVAL
&& FLAGS_SET(flags
, DISSECT_IMAGE_VERITY_SHARE
))
2346 -ENOENT
, /* Removed?? */
2347 -EBUSY
, /* Volume is being opened but not ready, crypt_init_by_name() can fetch details. */
2348 -ENODEV
/* Volume is being opened but not ready, crypt_init_by_name() would fail, try to open again. */ ))
2351 return log_debug_errno(r
, "Failed to check if existing verity device %s can be reused: %m", node
);
2354 /* devmapper might say that the device exists, but the devlink might not yet have been
2355 * created. Check and wait for the udev event in that case. */
2356 r
= device_wait_for_devlink(node
, "block", verity_timeout(), NULL
);
2357 /* Fallback to activation with a unique device if it's taking too long */
2358 if (r
== -ETIMEDOUT
&& FLAGS_SET(flags
, DISSECT_IMAGE_VERITY_SHARE
))
2361 return log_debug_errno(r
, "Failed to wait device node symlink %s: %m", node
);
2366 /* Now, the device is activated and devlink is created. Let's open it. */
2367 fd
= open(node
, O_RDONLY
|O_NONBLOCK
|O_CLOEXEC
|O_NOCTTY
);
2369 if (!ERRNO_IS_DEVICE_ABSENT(errno
))
2370 return log_debug_errno(errno
, "Failed to open verity device %s: %m", node
);
2372 /* The device has already been removed?? */
2377 mount_node_fd
= TAKE_FD(fd
);
2379 crypt_free_and_replace(cd
, existing_cd
);
2384 /* Device is being removed by another process. Let's wait for a while. */
2385 (void) usleep(2 * USEC_PER_MSEC
);
2388 /* All trials failed or a conflicting verity device exists. Let's try to activate with a unique name. */
2389 if (FLAGS_SET(flags
, DISSECT_IMAGE_VERITY_SHARE
)) {
2390 /* Before trying to activate with unique name, we need to free crypt_device object.
2391 * Otherwise, we get error from libcryptsetup like the following:
2393 * systemd[1234]: Cannot use device /dev/loop5 which is in use (already mapped or mounted).
2398 return verity_partition(designator
, m
, v
, verity
, flags
& ~DISSECT_IMAGE_VERITY_SHARE
, d
);
2401 return log_debug_errno(SYNTHETIC_ERRNO(EBUSY
), "All attempts to activate verity device %s failed.", name
);
2404 /* Everything looks good and we'll be able to mount the device, so deferred remove will be re-enabled at that point. */
2405 restore_deferred_remove
= mfree(restore_deferred_remove
);
2407 d
->decrypted
[d
->n_decrypted
++] = (DecryptedPartition
) {
2408 .name
= TAKE_PTR(name
),
2409 .device
= TAKE_PTR(cd
),
2412 m
->decrypted_node
= TAKE_PTR(node
);
2413 close_and_replace(m
->mount_node_fd
, mount_node_fd
);
2419 int dissected_image_decrypt(
2421 const char *passphrase
,
2422 const VeritySettings
*verity
,
2423 DissectImageFlags flags
) {
2425 #if HAVE_LIBCRYPTSETUP
2426 _cleanup_(decrypted_image_unrefp
) DecryptedImage
*d
= NULL
;
2431 assert(!verity
|| verity
->root_hash
|| verity
->root_hash_size
== 0);
2435 * = 0 → There was nothing to decrypt
2436 * > 0 → Decrypted successfully
2437 * -ENOKEY → There's something to decrypt but no key was supplied
2438 * -EKEYREJECTED → Passed key was not correct
2441 if (verity
&& verity
->root_hash
&& verity
->root_hash_size
< sizeof(sd_id128_t
))
2444 if (!m
->encrypted
&& !m
->verity_ready
)
2447 #if HAVE_LIBCRYPTSETUP
2448 r
= decrypted_image_new(&d
);
2452 for (PartitionDesignator i
= 0; i
< _PARTITION_DESIGNATOR_MAX
; i
++) {
2453 DissectedPartition
*p
= m
->partitions
+ i
;
2454 PartitionDesignator k
;
2459 r
= decrypt_partition(p
, passphrase
, flags
, d
);
2463 k
= partition_verity_of(i
);
2465 r
= verity_partition(i
, p
, m
->partitions
+ k
, verity
, flags
| DISSECT_IMAGE_VERITY_SHARE
, d
);
2470 if (!p
->decrypted_fstype
&& p
->mount_node_fd
>= 0 && p
->decrypted_node
) {
2471 r
= probe_filesystem_full(p
->mount_node_fd
, p
->decrypted_node
, 0, UINT64_MAX
, &p
->decrypted_fstype
);
2472 if (r
< 0 && r
!= -EUCLEAN
)
2477 m
->decrypted_image
= TAKE_PTR(d
);
2485 int dissected_image_decrypt_interactively(
2487 const char *passphrase
,
2488 const VeritySettings
*verity
,
2489 DissectImageFlags flags
) {
2491 _cleanup_strv_free_erase_
char **z
= NULL
;
2498 r
= dissected_image_decrypt(m
, passphrase
, verity
, flags
);
2501 if (r
== -EKEYREJECTED
)
2502 log_error_errno(r
, "Incorrect passphrase, try again!");
2503 else if (r
!= -ENOKEY
)
2504 return log_error_errno(r
, "Failed to decrypt image: %m");
2507 return log_error_errno(SYNTHETIC_ERRNO(EKEYREJECTED
),
2508 "Too many retries.");
2512 r
= ask_password_auto("Please enter image passphrase:", NULL
, "dissect", "dissect", "dissect.passphrase", USEC_INFINITY
, 0, &z
);
2514 return log_error_errno(r
, "Failed to query for passphrase: %m");
2520 static int decrypted_image_relinquish(DecryptedImage
*d
) {
2523 /* Turns on automatic removal after the last use ended for all DM devices of this image, and sets a
2524 * boolean so that we don't clean it up ourselves either anymore */
2526 #if HAVE_LIBCRYPTSETUP
2529 for (size_t i
= 0; i
< d
->n_decrypted
; i
++) {
2530 DecryptedPartition
*p
= d
->decrypted
+ i
;
2532 if (p
->relinquished
)
2535 r
= sym_crypt_deactivate_by_name(NULL
, p
->name
, CRYPT_DEACTIVATE_DEFERRED
);
2537 return log_debug_errno(r
, "Failed to mark %s for auto-removal: %m", p
->name
);
2539 p
->relinquished
= true;
2546 int dissected_image_relinquish(DissectedImage
*m
) {
2551 if (m
->decrypted_image
) {
2552 r
= decrypted_image_relinquish(m
->decrypted_image
);
2558 loop_device_relinquish(m
->loop
);
2563 static char *build_auxiliary_path(const char *image
, const char *suffix
) {
2570 e
= endswith(image
, ".raw");
2572 return strjoin(e
, suffix
);
2574 n
= new(char, e
- image
+ strlen(suffix
) + 1);
2578 strcpy(mempcpy(n
, image
, e
- image
), suffix
);
2582 void verity_settings_done(VeritySettings
*v
) {
2585 v
->root_hash
= mfree(v
->root_hash
);
2586 v
->root_hash_size
= 0;
2588 v
->root_hash_sig
= mfree(v
->root_hash_sig
);
2589 v
->root_hash_sig_size
= 0;
2591 v
->data_path
= mfree(v
->data_path
);
2594 int verity_settings_load(
2595 VeritySettings
*verity
,
2597 const char *root_hash_path
,
2598 const char *root_hash_sig_path
) {
2600 _cleanup_free_
void *root_hash
= NULL
, *root_hash_sig
= NULL
;
2601 size_t root_hash_size
= 0, root_hash_sig_size
= 0;
2602 _cleanup_free_
char *verity_data_path
= NULL
;
2603 PartitionDesignator designator
;
2608 assert(verity
->designator
< 0 || IN_SET(verity
->designator
, PARTITION_ROOT
, PARTITION_USR
));
2610 /* If we are asked to load the root hash for a device node, exit early */
2611 if (is_device_path(image
))
2614 r
= getenv_bool_secure("SYSTEMD_DISSECT_VERITY_SIDECAR");
2615 if (r
< 0 && r
!= -ENXIO
)
2616 log_debug_errno(r
, "Failed to parse $SYSTEMD_DISSECT_VERITY_SIDECAR, ignoring: %m");
2620 designator
= verity
->designator
;
2622 /* We only fill in what isn't already filled in */
2624 if (!verity
->root_hash
) {
2625 _cleanup_free_
char *text
= NULL
;
2627 if (root_hash_path
) {
2628 /* If explicitly specified it takes precedence */
2629 r
= read_one_line_file(root_hash_path
, &text
);
2634 designator
= PARTITION_ROOT
;
2636 /* Otherwise look for xattr and separate file, and first for the data for root and if
2637 * that doesn't exist for /usr */
2639 if (designator
< 0 || designator
== PARTITION_ROOT
) {
2640 r
= getxattr_malloc(image
, "user.verity.roothash", &text
);
2642 _cleanup_free_
char *p
= NULL
;
2644 if (r
!= -ENOENT
&& !ERRNO_IS_XATTR_ABSENT(r
))
2647 p
= build_auxiliary_path(image
, ".roothash");
2651 r
= read_one_line_file(p
, &text
);
2652 if (r
< 0 && r
!= -ENOENT
)
2657 designator
= PARTITION_ROOT
;
2660 if (!text
&& (designator
< 0 || designator
== PARTITION_USR
)) {
2661 /* So in the "roothash" xattr/file name above the "root" of course primarily
2662 * refers to the root of the Verity Merkle tree. But coincidentally it also
2663 * is the hash for the *root* file system, i.e. the "root" neatly refers to
2664 * two distinct concepts called "root". Taking benefit of this happy
2665 * coincidence we call the file with the root hash for the /usr/ file system
2666 * `usrhash`, because `usrroothash` or `rootusrhash` would just be too
2667 * confusing. We thus drop the reference to the root of the Merkle tree, and
2668 * just indicate which file system it's about. */
2669 r
= getxattr_malloc(image
, "user.verity.usrhash", &text
);
2671 _cleanup_free_
char *p
= NULL
;
2673 if (r
!= -ENOENT
&& !ERRNO_IS_XATTR_ABSENT(r
))
2676 p
= build_auxiliary_path(image
, ".usrhash");
2680 r
= read_one_line_file(p
, &text
);
2681 if (r
< 0 && r
!= -ENOENT
)
2686 designator
= PARTITION_USR
;
2691 r
= unhexmem(text
, strlen(text
), &root_hash
, &root_hash_size
);
2694 if (root_hash_size
< sizeof(sd_id128_t
))
2699 if ((root_hash
|| verity
->root_hash
) && !verity
->root_hash_sig
) {
2700 if (root_hash_sig_path
) {
2701 r
= read_full_file(root_hash_sig_path
, (char**) &root_hash_sig
, &root_hash_sig_size
);
2702 if (r
< 0 && r
!= -ENOENT
)
2706 designator
= PARTITION_ROOT
;
2708 if (designator
< 0 || designator
== PARTITION_ROOT
) {
2709 _cleanup_free_
char *p
= NULL
;
2711 /* Follow naming convention recommended by the relevant RFC:
2712 * https://tools.ietf.org/html/rfc5751#section-3.2.1 */
2713 p
= build_auxiliary_path(image
, ".roothash.p7s");
2717 r
= read_full_file(p
, (char**) &root_hash_sig
, &root_hash_sig_size
);
2718 if (r
< 0 && r
!= -ENOENT
)
2721 designator
= PARTITION_ROOT
;
2724 if (!root_hash_sig
&& (designator
< 0 || designator
== PARTITION_USR
)) {
2725 _cleanup_free_
char *p
= NULL
;
2727 p
= build_auxiliary_path(image
, ".usrhash.p7s");
2731 r
= read_full_file(p
, (char**) &root_hash_sig
, &root_hash_sig_size
);
2732 if (r
< 0 && r
!= -ENOENT
)
2735 designator
= PARTITION_USR
;
2739 if (root_hash_sig
&& root_hash_sig_size
== 0) /* refuse empty size signatures */
2743 if (!verity
->data_path
) {
2744 _cleanup_free_
char *p
= NULL
;
2746 p
= build_auxiliary_path(image
, ".verity");
2750 if (access(p
, F_OK
) < 0) {
2751 if (errno
!= ENOENT
)
2754 verity_data_path
= TAKE_PTR(p
);
2758 verity
->root_hash
= TAKE_PTR(root_hash
);
2759 verity
->root_hash_size
= root_hash_size
;
2762 if (root_hash_sig
) {
2763 verity
->root_hash_sig
= TAKE_PTR(root_hash_sig
);
2764 verity
->root_hash_sig_size
= root_hash_sig_size
;
2767 if (verity_data_path
)
2768 verity
->data_path
= TAKE_PTR(verity_data_path
);
2770 if (verity
->designator
< 0)
2771 verity
->designator
= designator
;
2776 int dissected_image_load_verity_sig_partition(
2779 VeritySettings
*verity
) {
2781 _cleanup_free_
void *root_hash
= NULL
, *root_hash_sig
= NULL
;
2782 _cleanup_(json_variant_unrefp
) JsonVariant
*v
= NULL
;
2783 size_t root_hash_size
, root_hash_sig_size
;
2784 _cleanup_free_
char *buf
= NULL
;
2785 PartitionDesignator d
;
2786 DissectedPartition
*p
;
2787 JsonVariant
*rh
, *sig
;
2796 if (verity
->root_hash
&& verity
->root_hash_sig
) /* Already loaded? */
2799 r
= getenv_bool_secure("SYSTEMD_DISSECT_VERITY_EMBEDDED");
2800 if (r
< 0 && r
!= -ENXIO
)
2801 log_debug_errno(r
, "Failed to parse $SYSTEMD_DISSECT_VERITY_EMBEDDED, ignoring: %m");
2805 d
= partition_verity_sig_of(verity
->designator
< 0 ? PARTITION_ROOT
: verity
->designator
);
2808 p
= m
->partitions
+ d
;
2811 if (p
->offset
== UINT64_MAX
|| p
->size
== UINT64_MAX
)
2814 if (p
->size
> 4*1024*1024) /* Signature data cannot possible be larger than 4M, refuse that */
2817 buf
= new(char, p
->size
+1);
2821 n
= pread(fd
, buf
, p
->size
, p
->offset
);
2824 if ((uint64_t) n
!= p
->size
)
2827 e
= memchr(buf
, 0, p
->size
);
2829 /* If we found a NUL byte then the rest of the data must be NUL too */
2830 if (!memeqzero(e
, p
->size
- (e
- buf
)))
2831 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL
), "Signature data contains embedded NUL byte.");
2835 r
= json_parse(buf
, 0, &v
, NULL
, NULL
);
2837 return log_debug_errno(r
, "Failed to parse signature JSON data: %m");
2839 rh
= json_variant_by_key(v
, "rootHash");
2841 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL
), "Signature JSON object lacks 'rootHash' field.");
2842 if (!json_variant_is_string(rh
))
2843 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL
), "'rootHash' field of signature JSON object is not a string.");
2845 r
= unhexmem(json_variant_string(rh
), SIZE_MAX
, &root_hash
, &root_hash_size
);
2847 return log_debug_errno(r
, "Failed to parse root hash field: %m");
2849 /* Check if specified root hash matches if it is specified */
2850 if (verity
->root_hash
&&
2851 memcmp_nn(verity
->root_hash
, verity
->root_hash_size
, root_hash
, root_hash_size
) != 0) {
2852 _cleanup_free_
char *a
= NULL
, *b
= NULL
;
2854 a
= hexmem(root_hash
, root_hash_size
);
2855 b
= hexmem(verity
->root_hash
, verity
->root_hash_size
);
2857 return log_debug_errno(r
, "Root hash in signature JSON data (%s) doesn't match configured hash (%s).", strna(a
), strna(b
));
2860 sig
= json_variant_by_key(v
, "signature");
2862 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL
), "Signature JSON object lacks 'signature' field.");
2863 if (!json_variant_is_string(sig
))
2864 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL
), "'signature' field of signature JSON object is not a string.");
2866 r
= unbase64mem(json_variant_string(sig
), SIZE_MAX
, &root_hash_sig
, &root_hash_sig_size
);
2868 return log_debug_errno(r
, "Failed to parse signature field: %m");
2870 free_and_replace(verity
->root_hash
, root_hash
);
2871 verity
->root_hash_size
= root_hash_size
;
2873 free_and_replace(verity
->root_hash_sig
, root_hash_sig
);
2874 verity
->root_hash_sig_size
= root_hash_sig_size
;
2879 int dissected_image_acquire_metadata(DissectedImage
*m
, DissectImageFlags extra_flags
) {
2886 META_INITRD_RELEASE
,
2887 META_EXTENSION_RELEASE
,
2888 META_HAS_INIT_SYSTEM
,
2892 static const char *const paths
[_META_MAX
] = {
2893 [META_HOSTNAME
] = "/etc/hostname\0",
2894 [META_MACHINE_ID
] = "/etc/machine-id\0",
2895 [META_MACHINE_INFO
] = "/etc/machine-info\0",
2896 [META_OS_RELEASE
] = ("/etc/os-release\0"
2897 "/usr/lib/os-release\0"),
2898 [META_INITRD_RELEASE
] = ("/etc/initrd-release\0"
2899 "/usr/lib/initrd-release\0"),
2900 [META_EXTENSION_RELEASE
] = "extension-release\0", /* Used only for logging. */
2901 [META_HAS_INIT_SYSTEM
] = "has-init-system\0", /* ditto */
2904 _cleanup_strv_free_
char **machine_info
= NULL
, **os_release
= NULL
, **initrd_release
= NULL
, **extension_release
= NULL
;
2905 _cleanup_close_pair_
int error_pipe
[2] = PIPE_EBADF
;
2906 _cleanup_(rmdir_and_freep
) char *t
= NULL
;
2907 _cleanup_(sigkill_waitp
) pid_t child
= 0;
2908 sd_id128_t machine_id
= SD_ID128_NULL
;
2909 _cleanup_free_
char *hostname
= NULL
;
2910 unsigned n_meta_initialized
= 0;
2911 int fds
[2 * _META_MAX
], r
, v
;
2912 int has_init_system
= -1;
2915 BLOCK_SIGNALS(SIGCHLD
);
2919 for (; n_meta_initialized
< _META_MAX
; n_meta_initialized
++) {
2920 if (!paths
[n_meta_initialized
]) {
2921 fds
[2*n_meta_initialized
] = fds
[2*n_meta_initialized
+1] = -EBADF
;
2925 if (pipe2(fds
+ 2*n_meta_initialized
, O_CLOEXEC
) < 0) {
2931 r
= mkdtemp_malloc("/tmp/dissect-XXXXXX", &t
);
2935 if (pipe2(error_pipe
, O_CLOEXEC
) < 0) {
2940 r
= safe_fork("(sd-dissect)", FORK_RESET_SIGNALS
|FORK_DEATHSIG
|FORK_NEW_MOUNTNS
|FORK_MOUNTNS_SLAVE
, &child
);
2944 /* Child in a new mount namespace */
2945 error_pipe
[0] = safe_close(error_pipe
[0]);
2947 r
= dissected_image_mount(
2953 DISSECT_IMAGE_READ_ONLY
|
2954 DISSECT_IMAGE_MOUNT_ROOT_ONLY
|
2955 DISSECT_IMAGE_USR_NO_ROOT
);
2957 log_debug_errno(r
, "Failed to mount dissected image: %m");
2961 for (unsigned k
= 0; k
< _META_MAX
; k
++) {
2962 _cleanup_close_
int fd
= -ENOENT
;
2967 fds
[2*k
] = safe_close(fds
[2*k
]);
2971 case META_EXTENSION_RELEASE
:
2972 /* As per the os-release spec, if the image is an extension it will have a file
2973 * named after the image name in extension-release.d/ - we use the image name
2974 * and try to resolve it with the extension-release helpers, as sometimes
2975 * the image names are mangled on deployment and do not match anymore.
2976 * Unlike other paths this is not fixed, and the image name
2977 * can be mangled on deployment, so by calling into the helper
2978 * we allow a fallback that matches on the first extension-release
2979 * file found in the directory, if one named after the image cannot
2980 * be found first. */
2981 r
= open_extension_release(t
, m
->image_name
, /* relax_extension_release_check= */ false, NULL
, &fd
);
2983 fd
= r
; /* Propagate the error. */
2986 case META_HAS_INIT_SYSTEM
: {
2989 FOREACH_STRING(init
,
2990 "/usr/lib/systemd/systemd", /* systemd on /usr merged system */
2991 "/lib/systemd/systemd", /* systemd on /usr non-merged systems */
2992 "/sbin/init") { /* traditional path the Linux kernel invokes */
2994 r
= chase_symlinks(init
, t
, CHASE_PREFIX_ROOT
, NULL
, NULL
);
2997 log_debug_errno(r
, "Failed to resolve %s, ignoring: %m", init
);
3004 r
= loop_write(fds
[2*k
+1], &found
, sizeof(found
), false);
3012 NULSTR_FOREACH(p
, paths
[k
]) {
3013 fd
= chase_symlinks_and_open(p
, t
, CHASE_PREFIX_ROOT
, O_RDONLY
|O_CLOEXEC
|O_NOCTTY
, NULL
);
3020 log_debug_errno(fd
, "Failed to read %s file of image, ignoring: %m", paths
[k
]);
3021 fds
[2*k
+1] = safe_close(fds
[2*k
+1]);
3025 r
= copy_bytes(fd
, fds
[2*k
+1], UINT64_MAX
, 0);
3029 fds
[2*k
+1] = safe_close(fds
[2*k
+1]);
3032 _exit(EXIT_SUCCESS
);
3035 /* Let parent know the error */
3036 (void) write(error_pipe
[1], &r
, sizeof(r
));
3037 _exit(EXIT_FAILURE
);
3040 error_pipe
[1] = safe_close(error_pipe
[1]);
3042 for (unsigned k
= 0; k
< _META_MAX
; k
++) {
3043 _cleanup_fclose_
FILE *f
= NULL
;
3048 fds
[2*k
+1] = safe_close(fds
[2*k
+1]);
3050 f
= take_fdopen(&fds
[2*k
], "r");
3059 r
= read_etc_hostname_stream(f
, &hostname
);
3061 log_debug_errno(r
, "Failed to read /etc/hostname of image: %m");
3065 case META_MACHINE_ID
: {
3066 _cleanup_free_
char *line
= NULL
;
3068 r
= read_line(f
, LONG_LINE_MAX
, &line
);
3070 log_debug_errno(r
, "Failed to read /etc/machine-id of image: %m");
3072 r
= sd_id128_from_string(line
, &machine_id
);
3074 log_debug_errno(r
, "Image contains invalid /etc/machine-id: %s", line
);
3076 log_debug("/etc/machine-id file of image is empty.");
3077 else if (streq(line
, "uninitialized"))
3078 log_debug("/etc/machine-id file of image is uninitialized (likely aborted first boot).");
3080 log_debug("/etc/machine-id file of image has unexpected length %i.", r
);
3085 case META_MACHINE_INFO
:
3086 r
= load_env_file_pairs(f
, "machine-info", &machine_info
);
3088 log_debug_errno(r
, "Failed to read /etc/machine-info of image: %m");
3092 case META_OS_RELEASE
:
3093 r
= load_env_file_pairs(f
, "os-release", &os_release
);
3095 log_debug_errno(r
, "Failed to read OS release file of image: %m");
3099 case META_INITRD_RELEASE
:
3100 r
= load_env_file_pairs(f
, "initrd-release", &initrd_release
);
3102 log_debug_errno(r
, "Failed to read initrd release file of image: %m");
3106 case META_EXTENSION_RELEASE
:
3107 r
= load_env_file_pairs(f
, "extension-release", &extension_release
);
3109 log_debug_errno(r
, "Failed to read extension release file of image: %m");
3113 case META_HAS_INIT_SYSTEM
: {
3118 nr
= fread(&b
, 1, sizeof(b
), f
);
3119 if (nr
!= sizeof(b
))
3120 log_debug_errno(errno_or_else(EIO
), "Failed to read has-init-system boolean: %m");
3122 has_init_system
= b
;
3128 r
= wait_for_terminate_and_check("(sd-dissect)", child
, 0);
3133 n
= read(error_pipe
[0], &v
, sizeof(v
));
3137 return v
; /* propagate error sent to us from child */
3141 if (r
!= EXIT_SUCCESS
)
3144 free_and_replace(m
->hostname
, hostname
);
3145 m
->machine_id
= machine_id
;
3146 strv_free_and_replace(m
->machine_info
, machine_info
);
3147 strv_free_and_replace(m
->os_release
, os_release
);
3148 strv_free_and_replace(m
->initrd_release
, initrd_release
);
3149 strv_free_and_replace(m
->extension_release
, extension_release
);
3150 m
->has_init_system
= has_init_system
;
3153 for (unsigned k
= 0; k
< n_meta_initialized
; k
++)
3154 safe_close_pair(fds
+ 2*k
);
3159 Architecture
dissected_image_architecture(DissectedImage
*img
) {
3162 if (img
->partitions
[PARTITION_ROOT
].found
&&
3163 img
->partitions
[PARTITION_ROOT
].architecture
>= 0)
3164 return img
->partitions
[PARTITION_ROOT
].architecture
;
3166 if (img
->partitions
[PARTITION_USR
].found
&&
3167 img
->partitions
[PARTITION_USR
].architecture
>= 0)
3168 return img
->partitions
[PARTITION_USR
].architecture
;
3170 return _ARCHITECTURE_INVALID
;
3173 int dissect_loop_device(
3175 const VeritySettings
*verity
,
3176 const MountOptions
*mount_options
,
3177 DissectImageFlags flags
,
3178 DissectedImage
**ret
) {
3181 _cleanup_(dissected_image_unrefp
) DissectedImage
*m
= NULL
;
3187 r
= dissected_image_new(loop
->backing_file
?: loop
->node
, &m
);
3191 m
->loop
= loop_device_ref(loop
);
3192 m
->sector_size
= m
->loop
->sector_size
;
3194 r
= dissect_image(m
, loop
->fd
, loop
->node
, verity
, mount_options
, flags
);
3205 int dissect_loop_device_and_warn(
3207 const VeritySettings
*verity
,
3208 const MountOptions
*mount_options
,
3209 DissectImageFlags flags
,
3210 DissectedImage
**ret
) {
3216 assert(loop
->fd
>= 0);
3218 name
= ASSERT_PTR(loop
->backing_file
?: loop
->node
);
3220 r
= dissect_loop_device(loop
, verity
, mount_options
, flags
, ret
);
3224 return log_error_errno(r
, "Dissecting images is not supported, compiled without blkid support.");
3227 return log_error_errno(r
, "%s: Couldn't identify a suitable partition table or file system.", name
);
3230 return log_error_errno(r
, "%s: The image does not pass validation.", name
);
3232 case -EADDRNOTAVAIL
:
3233 return log_error_errno(r
, "%s: No root partition for specified root hash found.", name
);
3236 return log_error_errno(r
, "%s: Multiple suitable root partitions found in image.", name
);
3239 return log_error_errno(r
, "%s: No suitable root partition found in image.", name
);
3241 case -EPROTONOSUPPORT
:
3242 return log_error_errno(r
, "Device '%s' is loopback block device with partition scanning turned off, please turn it on.", name
);
3245 return log_error_errno(r
, "%s: Image is not a block device.", name
);
3248 return log_error_errno(r
,
3249 "Combining partitioned images (such as '%s') with external Verity data (such as '%s') not supported. "
3250 "(Consider setting $SYSTEMD_DISSECT_VERITY_SIDECAR=0 to disable automatic discovery of external Verity data.)",
3251 name
, strna(verity
? verity
->data_path
: NULL
));
3255 return log_error_errno(r
, "Failed to dissect image '%s': %m", name
);
3261 bool dissected_image_verity_candidate(const DissectedImage
*image
, PartitionDesignator partition_designator
) {
3264 /* Checks if this partition could theoretically do Verity. For non-partitioned images this only works
3265 * if there's an external verity file supplied, for which we can consult .has_verity. For partitioned
3266 * images we only check the partition type.
3268 * This call is used to decide whether to suppress or show a verity column in tabular output of the
3271 if (image
->single_file_system
)
3272 return partition_designator
== PARTITION_ROOT
&& image
->has_verity
;
3274 return partition_verity_of(partition_designator
) >= 0;
3277 bool dissected_image_verity_ready(const DissectedImage
*image
, PartitionDesignator partition_designator
) {
3278 PartitionDesignator k
;
3282 /* Checks if this partition has verity data available that we can activate. For non-partitioned this
3283 * works for the root partition, for others only if the associated verity partition was found. */
3285 if (!image
->verity_ready
)
3288 if (image
->single_file_system
)
3289 return partition_designator
== PARTITION_ROOT
;
3291 k
= partition_verity_of(partition_designator
);
3292 return k
>= 0 && image
->partitions
[k
].found
;
3295 bool dissected_image_verity_sig_ready(const DissectedImage
*image
, PartitionDesignator partition_designator
) {
3296 PartitionDesignator k
;
3300 /* Checks if this partition has verity signature data available that we can use. */
3302 if (!image
->verity_sig_ready
)
3305 if (image
->single_file_system
)
3306 return partition_designator
== PARTITION_ROOT
;
3308 k
= partition_verity_sig_of(partition_designator
);
3309 return k
>= 0 && image
->partitions
[k
].found
;
3312 MountOptions
* mount_options_free_all(MountOptions
*options
) {
3315 while ((m
= options
)) {
3316 LIST_REMOVE(mount_options
, options
, m
);
3324 const char* mount_options_from_designator(const MountOptions
*options
, PartitionDesignator designator
) {
3325 LIST_FOREACH(mount_options
, m
, options
)
3326 if (designator
== m
->partition_designator
&& !isempty(m
->options
))
3332 int mount_image_privately_interactively(
3334 DissectImageFlags flags
,
3335 char **ret_directory
,
3337 LoopDevice
**ret_loop_device
) {
3339 _cleanup_(verity_settings_done
) VeritySettings verity
= VERITY_SETTINGS_DEFAULT
;
3340 _cleanup_(loop_device_unrefp
) LoopDevice
*d
= NULL
;
3341 _cleanup_(dissected_image_unrefp
) DissectedImage
*dissected_image
= NULL
;
3342 _cleanup_(rmdir_and_freep
) char *created_dir
= NULL
;
3343 _cleanup_free_
char *temp
= NULL
;
3346 /* Mounts an OS image at a temporary place, inside a newly created mount namespace of our own. This
3347 * is used by tools such as systemd-tmpfiles or systemd-firstboot to operate on some disk image
3351 assert(ret_directory
);
3352 assert(ret_loop_device
);
3354 /* We intend to mount this right-away, hence add the partitions if needed and pin them. */
3355 flags
|= DISSECT_IMAGE_ADD_PARTITION_DEVICES
|
3356 DISSECT_IMAGE_PIN_PARTITION_DEVICES
;
3358 r
= verity_settings_load(&verity
, image
, NULL
, NULL
);
3360 return log_error_errno(r
, "Failed to load root hash data: %m");
3362 r
= tempfn_random_child(NULL
, program_invocation_short_name
, &temp
);
3364 return log_error_errno(r
, "Failed to generate temporary mount directory: %m");
3366 r
= loop_device_make_by_path(
3368 FLAGS_SET(flags
, DISSECT_IMAGE_DEVICE_READ_ONLY
) ? O_RDONLY
: O_RDWR
,
3369 /* sector_size= */ UINT32_MAX
,
3370 FLAGS_SET(flags
, DISSECT_IMAGE_NO_PARTITION_TABLE
) ? 0 : LO_FLAGS_PARTSCAN
,
3374 return log_error_errno(r
, "Failed to set up loopback device for %s: %m", image
);
3376 r
= dissect_loop_device_and_warn(d
, &verity
, NULL
, flags
, &dissected_image
);
3380 r
= dissected_image_load_verity_sig_partition(dissected_image
, d
->fd
, &verity
);
3384 r
= dissected_image_decrypt_interactively(dissected_image
, NULL
, &verity
, flags
);
3388 r
= detach_mount_namespace();
3390 return log_error_errno(r
, "Failed to detach mount namespace: %m");
3392 r
= mkdir_p(temp
, 0700);
3394 return log_error_errno(r
, "Failed to create mount point: %m");
3396 created_dir
= TAKE_PTR(temp
);
3398 r
= dissected_image_mount_and_warn(dissected_image
, created_dir
, UID_INVALID
, UID_INVALID
, flags
);
3402 r
= loop_device_flock(d
, LOCK_UN
);
3406 r
= dissected_image_relinquish(dissected_image
);
3408 return log_error_errno(r
, "Failed to relinquish DM and loopback block devices: %m");
3411 _cleanup_close_
int dir_fd
= -EBADF
;
3413 dir_fd
= open(created_dir
, O_CLOEXEC
|O_DIRECTORY
);
3415 return log_error_errno(errno
, "Failed to open mount point directory: %m");
3417 *ret_dir_fd
= TAKE_FD(dir_fd
);
3420 *ret_directory
= TAKE_PTR(created_dir
);
3421 *ret_loop_device
= TAKE_PTR(d
);
3426 static bool mount_options_relax_extension_release_checks(const MountOptions
*options
) {
3430 return string_contains_word(mount_options_from_designator(options
, PARTITION_ROOT
), ",", "x-systemd.relax-extension-release-check") ||
3431 string_contains_word(mount_options_from_designator(options
, PARTITION_USR
), ",", "x-systemd.relax-extension-release-check") ||
3432 string_contains_word(options
->options
, ",", "x-systemd.relax-extension-release-check");
3435 int verity_dissect_and_mount(
3439 const MountOptions
*options
,
3440 const char *required_host_os_release_id
,
3441 const char *required_host_os_release_version_id
,
3442 const char *required_host_os_release_sysext_level
,
3443 const char *required_sysext_scope
) {
3445 _cleanup_(loop_device_unrefp
) LoopDevice
*loop_device
= NULL
;
3446 _cleanup_(dissected_image_unrefp
) DissectedImage
*dissected_image
= NULL
;
3447 _cleanup_(verity_settings_done
) VeritySettings verity
= VERITY_SETTINGS_DEFAULT
;
3448 DissectImageFlags dissect_image_flags
;
3449 bool relax_extension_release_check
;
3455 relax_extension_release_check
= mount_options_relax_extension_release_checks(options
);
3457 /* We might get an FD for the image, but we use the original path to look for the dm-verity files */
3458 r
= verity_settings_load(&verity
, src
, NULL
, NULL
);
3460 return log_debug_errno(r
, "Failed to load root hash: %m");
3462 dissect_image_flags
= (verity
.data_path
? DISSECT_IMAGE_NO_PARTITION_TABLE
: 0) |
3463 (relax_extension_release_check
? DISSECT_IMAGE_RELAX_SYSEXT_CHECK
: 0) |
3464 DISSECT_IMAGE_ADD_PARTITION_DEVICES
|
3465 DISSECT_IMAGE_PIN_PARTITION_DEVICES
;
3467 /* Note that we don't use loop_device_make here, as the FD is most likely O_PATH which would not be
3468 * accepted by LOOP_CONFIGURE, so just let loop_device_make_by_path reopen it as a regular FD. */
3469 r
= loop_device_make_by_path(
3470 src_fd
>= 0 ? FORMAT_PROC_FD_PATH(src_fd
) : src
,
3471 /* open_flags= */ -1,
3472 /* sector_size= */ UINT32_MAX
,
3473 verity
.data_path
? 0 : LO_FLAGS_PARTSCAN
,
3477 return log_debug_errno(r
, "Failed to create loop device for image: %m");
3479 r
= dissect_loop_device(
3483 dissect_image_flags
,
3485 /* No partition table? Might be a single-filesystem image, try again */
3486 if (!verity
.data_path
&& r
== -ENOPKG
)
3487 r
= dissect_loop_device(
3491 dissect_image_flags
| DISSECT_IMAGE_NO_PARTITION_TABLE
,
3494 return log_debug_errno(r
, "Failed to dissect image: %m");
3496 r
= dissected_image_load_verity_sig_partition(dissected_image
, loop_device
->fd
, &verity
);
3500 r
= dissected_image_decrypt(
3504 dissect_image_flags
);
3506 return log_debug_errno(r
, "Failed to decrypt dissected image: %m");
3508 r
= mkdir_p_label(dest
, 0755);
3510 return log_debug_errno(r
, "Failed to create destination directory %s: %m", dest
);
3511 r
= umount_recursive(dest
, 0);
3513 return log_debug_errno(r
, "Failed to umount under destination directory %s: %m", dest
);
3515 r
= dissected_image_mount(dissected_image
, dest
, UID_INVALID
, UID_INVALID
, dissect_image_flags
);
3517 return log_debug_errno(r
, "Failed to mount image: %m");
3519 r
= loop_device_flock(loop_device
, LOCK_UN
);
3521 return log_debug_errno(r
, "Failed to unlock loopback device: %m");
3523 /* If we got os-release values from the caller, then we need to match them with the image's
3524 * extension-release.d/ content. Return -EINVAL if there's any mismatch.
3525 * First, check the distro ID. If that matches, then check the new SYSEXT_LEVEL value if
3526 * available, or else fallback to VERSION_ID. If neither is present (eg: rolling release),
3527 * then a simple match on the ID will be performed. */
3528 if (required_host_os_release_id
) {
3529 _cleanup_strv_free_
char **extension_release
= NULL
;
3531 assert(!isempty(required_host_os_release_id
));
3533 r
= load_extension_release_pairs(dest
, dissected_image
->image_name
, relax_extension_release_check
, &extension_release
);
3535 return log_debug_errno(r
, "Failed to parse image %s extension-release metadata: %m", dissected_image
->image_name
);
3537 r
= extension_release_validate(
3538 dissected_image
->image_name
,
3539 required_host_os_release_id
,
3540 required_host_os_release_version_id
,
3541 required_host_os_release_sysext_level
,
3542 required_sysext_scope
,
3545 return log_debug_errno(SYNTHETIC_ERRNO(ESTALE
), "Image %s extension-release metadata does not match the root's", dissected_image
->image_name
);
3547 return log_debug_errno(r
, "Failed to compare image %s extension-release metadata with the root's os-release: %m", dissected_image
->image_name
);
3550 r
= dissected_image_relinquish(dissected_image
);
3552 return log_debug_errno(r
, "Failed to relinquish dissected image: %m");