1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
3 #include <linux/loop.h>
10 #if HAVE_VALGRIND_MEMCHECK_H
11 #include <valgrind/memcheck.h>
14 #include "sd-daemon.h"
15 #include "sd-device.h"
18 #include "blkid-util.h"
19 #include "blockdev-util.h"
20 #include "btrfs-util.h"
21 #include "chattr-util.h"
24 #include "errno-util.h"
26 #include "fdisk-util.h"
28 #include "filesystems.h"
30 #include "fsck-util.h"
32 #include "home-util.h"
33 #include "homework-luks.h"
34 #include "homework-mount.h"
35 #include "id128-util.h"
37 #include "keyring-util.h"
38 #include "memory-util.h"
39 #include "missing_magic.h"
41 #include "mkfs-util.h"
42 #include "mount-util.h"
43 #include "openssl-util.h"
44 #include "parse-util.h"
45 #include "path-util.h"
46 #include "process-util.h"
47 #include "random-util.h"
48 #include "resize-fs.h"
49 #include "stat-util.h"
51 #include "sync-util.h"
52 #include "tmpfile-util.h"
53 #include "udev-util.h"
54 #include "user-util.h"
56 /* Round down to the nearest 4K size. Given that newer hardware generally prefers 4K sectors, let's align our
57 * partitions to that too. In the worst case we'll waste 3.5K per partition that way, but I think I can live
59 #define DISK_SIZE_ROUND_DOWN(x) ((x) & ~UINT64_C(4095))
61 /* Rounds up to the nearest 4K boundary. Returns UINT64_MAX on overflow */
62 #define DISK_SIZE_ROUND_UP(x) \
65 _x > UINT64_MAX - 4095U ? UINT64_MAX : (_x + 4095U) & ~UINT64_C(4095); \
68 /* How much larger will the image on disk be than the fs inside it, i.e. the space we pay for the GPT and
69 * LUKS2 envelope. (As measured on cryptsetup 2.4.1) */
70 #define GPT_LUKS2_OVERHEAD UINT64_C(18874368)
72 static int resize_image_loop(UserRecord
*h
, HomeSetup
*setup
, uint64_t old_image_size
, uint64_t new_image_size
, uint64_t *ret_image_size
);
74 int run_mark_dirty(int fd
, bool b
) {
78 /* Sets or removes the 'user.home-dirty' xattr on the specified file. We use this to detect when a
79 * home directory was not properly unmounted. */
83 r
= fd_verify_regular(fd
);
88 ret
= fsetxattr(fd
, "user.home-dirty", &x
, 1, XATTR_CREATE
);
89 if (ret
< 0 && errno
!= EEXIST
)
90 return log_debug_errno(errno
, "Could not mark home directory as dirty: %m");
95 return log_debug_errno(r
, "Failed to synchronize image before marking it clean: %m");
97 ret
= fremovexattr(fd
, "user.home-dirty");
98 if (ret
< 0 && errno
!= ENODATA
)
99 return log_debug_errno(errno
, "Could not mark home directory as clean: %m");
104 return log_debug_errno(r
, "Failed to synchronize dirty flag to disk: %m");
109 int run_mark_dirty_by_path(const char *path
, bool b
) {
110 _cleanup_close_
int fd
= -1;
114 fd
= open(path
, O_RDWR
|O_CLOEXEC
|O_NOCTTY
);
116 return log_debug_errno(errno
, "Failed to open %s to mark dirty or clean: %m", path
);
118 return run_mark_dirty(fd
, b
);
121 static int probe_file_system_by_fd(
124 sd_id128_t
*ret_uuid
) {
126 _cleanup_(blkid_free_probep
) blkid_probe b
= NULL
;
127 _cleanup_free_
char *s
= NULL
;
128 const char *fstype
= NULL
, *uuid
= NULL
;
136 b
= blkid_new_probe();
141 r
= blkid_probe_set_device(b
, fd
, 0, 0);
143 return errno
> 0 ? -errno
: -ENOMEM
;
145 (void) blkid_probe_enable_superblocks(b
, 1);
146 (void) blkid_probe_set_superblocks_flags(b
, BLKID_SUBLKS_TYPE
|BLKID_SUBLKS_UUID
);
149 r
= blkid_do_safeprobe(b
);
150 if (IN_SET(r
, -2, 1)) /* nothing found or ambiguous result */
153 return errno
> 0 ? -errno
: -EIO
;
155 (void) blkid_probe_lookup_value(b
, "TYPE", &fstype
, NULL
);
159 (void) blkid_probe_lookup_value(b
, "UUID", &uuid
, NULL
);
163 r
= sd_id128_from_string(uuid
, &id
);
171 *ret_fstype
= TAKE_PTR(s
);
177 static int probe_file_system_by_path(const char *path
, char **ret_fstype
, sd_id128_t
*ret_uuid
) {
178 _cleanup_close_
int fd
= -1;
180 fd
= open(path
, O_RDONLY
|O_CLOEXEC
|O_NOCTTY
|O_NONBLOCK
);
184 return probe_file_system_by_fd(fd
, ret_fstype
, ret_uuid
);
187 static int block_get_size_by_fd(int fd
, uint64_t *ret
) {
193 if (fstat(fd
, &st
) < 0)
196 if (!S_ISBLK(st
.st_mode
))
199 return RET_NERRNO(ioctl(fd
, BLKGETSIZE64
, ret
));
202 static int block_get_size_by_path(const char *path
, uint64_t *ret
) {
203 _cleanup_close_
int fd
= -1;
205 fd
= open(path
, O_RDONLY
|O_CLOEXEC
|O_NOCTTY
|O_NONBLOCK
);
209 return block_get_size_by_fd(fd
, ret
);
212 static int run_fsck(const char *node
, const char *fstype
) {
219 r
= fsck_exists(fstype
);
221 return log_error_errno(r
, "Failed to check if fsck for file system %s exists: %m", fstype
);
223 log_warning("No fsck for file system %s installed, ignoring.", fstype
);
227 r
= safe_fork("(fsck)",
228 FORK_RESET_SIGNALS
|FORK_RLIMIT_NOFILE_SAFE
|FORK_DEATHSIG
|FORK_LOG
|FORK_STDOUT_TO_STDERR
|FORK_CLOSE_ALL_FDS
,
234 execl("/sbin/fsck", "/sbin/fsck", "-aTl", node
, NULL
);
236 log_error_errno(errno
, "Failed to execute fsck: %m");
237 _exit(FSCK_OPERATIONAL_ERROR
);
240 exit_status
= wait_for_terminate_and_check("fsck", fsck_pid
, WAIT_LOG_ABNORMAL
);
243 if ((exit_status
& ~FSCK_ERROR_CORRECTED
) != 0) {
244 log_warning("fsck failed with exit status %i.", exit_status
);
246 if ((exit_status
& (FSCK_SYSTEM_SHOULD_REBOOT
|FSCK_ERRORS_LEFT_UNCORRECTED
)) != 0)
247 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "File system is corrupted, refusing.");
249 log_warning("Ignoring fsck error.");
252 log_info("File system check completed.");
257 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(key_serial_t
, keyring_unlink
, -1);
259 static int upload_to_keyring(
261 const char *password
,
262 key_serial_t
*ret_key_serial
) {
264 _cleanup_free_
char *name
= NULL
;
270 /* If auto-shrink-on-logout is turned on, we need to keep the key we used to unlock the LUKS volume
271 * around, since we'll need it when automatically resizing (since we can't ask the user there
272 * again). We do this by uploading it into the kernel keyring, specifically the "session" one. This
273 * is done under the assumption systemd-homed gets its private per-session keyring (i.e. default
274 * service behaviour, given that KeyringMode=private is the default). It will survive between our
275 * systemd-homework invocations that way.
277 * If auto-shrink-on-logout is disabled we'll skip this step, to be frugal with sensitive data. */
279 if (user_record_auto_resize_mode(h
) != AUTO_RESIZE_SHRINK_AND_GROW
) { /* Won't need it */
281 *ret_key_serial
= -1;
285 name
= strjoin("homework-user-", h
->user_name
);
289 serial
= add_key("user", name
, password
, strlen(password
), KEY_SPEC_SESSION_KEYRING
);
294 *ret_key_serial
= serial
;
299 static int luks_try_passwords(
301 struct crypt_device
*cd
,
304 size_t *volume_key_size
,
305 key_serial_t
*ret_key_serial
) {
312 STRV_FOREACH(pp
, passwords
) {
313 size_t vks
= *volume_key_size
;
315 r
= sym_crypt_volume_key_get(
323 if (ret_key_serial
) {
324 /* If ret_key_serial is non-NULL, let's try to upload the password that
325 * worked, and return its serial. */
326 r
= upload_to_keyring(h
, *pp
, ret_key_serial
);
328 log_debug_errno(r
, "Failed to upload LUKS password to kernel keyring, ignoring: %m");
329 *ret_key_serial
= -1;
333 *volume_key_size
= vks
;
337 log_debug_errno(r
, "Password %zu didn't work for unlocking LUKS superblock: %m", (size_t) (pp
- passwords
));
343 static int luks_setup(
349 const char *cipher_mode
,
350 uint64_t volume_key_size
,
352 const PasswordCache
*cache
,
354 struct crypt_device
**ret
,
355 sd_id128_t
*ret_found_uuid
,
356 void **ret_volume_key
,
357 size_t *ret_volume_key_size
,
358 key_serial_t
*ret_key_serial
) {
360 _cleanup_(keyring_unlinkp
) key_serial_t key_serial
= -1;
361 _cleanup_(sym_crypt_freep
) struct crypt_device
*cd
= NULL
;
362 _cleanup_(erase_and_freep
) void *vk
= NULL
;
373 r
= sym_crypt_init(&cd
, node
);
375 return log_error_errno(r
, "Failed to allocate libcryptsetup context: %m");
377 cryptsetup_enable_logging(cd
);
379 r
= sym_crypt_load(cd
, CRYPT_LUKS2
, NULL
);
381 return log_error_errno(r
, "Failed to load LUKS superblock: %m");
383 r
= sym_crypt_get_volume_key_size(cd
);
385 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine LUKS volume key size");
388 if (!sd_id128_is_null(uuid
) || ret_found_uuid
) {
391 s
= sym_crypt_get_uuid(cd
);
393 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock has no UUID.");
395 r
= sd_id128_from_string(s
, &p
);
397 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock has invalid UUID.");
399 /* Check that the UUID matches, if specified */
400 if (!sd_id128_is_null(uuid
) &&
401 !sd_id128_equal(uuid
, p
))
402 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock has wrong UUID.");
405 if (cipher
&& !streq_ptr(cipher
, sym_crypt_get_cipher(cd
)))
406 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock declares wrong cipher.");
408 if (cipher_mode
&& !streq_ptr(cipher_mode
, sym_crypt_get_cipher_mode(cd
)))
409 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock declares wrong cipher mode.");
411 if (volume_key_size
!= UINT64_MAX
&& vks
!= volume_key_size
)
412 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock declares wrong volume key size.");
419 FOREACH_POINTER(list
,
420 cache
? cache
->keyring_passswords
: NULL
,
421 cache
? cache
->pkcs11_passwords
: NULL
,
422 cache
? cache
->fido2_passwords
: NULL
,
424 r
= luks_try_passwords(h
, cd
, list
, vk
, &vks
, ret_key_serial
? &key_serial
: NULL
);
429 return log_error_errno(r
, "No valid password for LUKS superblock.");
431 return log_error_errno(r
, "Failed to unlock LUKS superblock: %m");
433 r
= sym_crypt_activate_by_volume_key(
437 discard
? CRYPT_ACTIVATE_ALLOW_DISCARDS
: 0);
439 return log_error_errno(r
, "Failed to unlock LUKS superblock: %m");
441 log_info("Setting up LUKS device /dev/mapper/%s completed.", dm_name
);
445 if (ret_found_uuid
) /* Return the UUID actually found if the caller wants to know */
448 *ret_volume_key
= TAKE_PTR(vk
);
449 if (ret_volume_key_size
)
450 *ret_volume_key_size
= vks
;
452 *ret_key_serial
= TAKE_KEY_SERIAL(key_serial
);
457 static int make_dm_names(UserRecord
*h
, HomeSetup
*setup
) {
459 assert(h
->user_name
);
462 if (!setup
->dm_name
) {
463 setup
->dm_name
= strjoin("home-", h
->user_name
);
468 if (!setup
->dm_node
) {
469 setup
->dm_node
= path_join("/dev/mapper/", setup
->dm_name
);
477 static int acquire_open_luks_device(
482 _cleanup_(sym_crypt_freep
) struct crypt_device
*cd
= NULL
;
487 assert(!setup
->crypt_device
);
489 r
= dlopen_cryptsetup();
493 r
= make_dm_names(h
, setup
);
497 r
= sym_crypt_init_by_name(&cd
, setup
->dm_name
);
498 if (IN_SET(r
, -ENODEV
, -EINVAL
, -ENOENT
) && graceful
)
501 return log_error_errno(r
, "Failed to initialize cryptsetup context for %s: %m", setup
->dm_name
);
503 cryptsetup_enable_logging(cd
);
505 setup
->crypt_device
= TAKE_PTR(cd
);
509 static int luks_open(
512 const PasswordCache
*cache
,
513 sd_id128_t
*ret_found_uuid
,
514 void **ret_volume_key
,
515 size_t *ret_volume_key_size
) {
517 _cleanup_(erase_and_freep
) void *vk
= NULL
;
525 assert(!setup
->crypt_device
);
527 /* Opens a LUKS device that is already set up. Re-validates the password while doing so (which also
528 * provides us with the volume key, which we want). */
530 r
= acquire_open_luks_device(h
, setup
, /* graceful= */ false);
534 r
= sym_crypt_load(setup
->crypt_device
, CRYPT_LUKS2
, NULL
);
536 return log_error_errno(r
, "Failed to load LUKS superblock: %m");
538 r
= sym_crypt_get_volume_key_size(setup
->crypt_device
);
540 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine LUKS volume key size");
543 if (ret_found_uuid
) {
546 s
= sym_crypt_get_uuid(setup
->crypt_device
);
548 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock has no UUID.");
550 r
= sd_id128_from_string(s
, &p
);
552 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock has invalid UUID.");
560 FOREACH_POINTER(list
,
561 cache
? cache
->keyring_passswords
: NULL
,
562 cache
? cache
->pkcs11_passwords
: NULL
,
563 cache
? cache
->fido2_passwords
: NULL
,
565 r
= luks_try_passwords(h
, setup
->crypt_device
, list
, vk
, &vks
, NULL
);
570 return log_error_errno(r
, "No valid password for LUKS superblock.");
572 return log_error_errno(r
, "Failed to unlocks LUKS superblock: %m");
574 log_info("Discovered used LUKS device /dev/mapper/%s, and validated password.", setup
->dm_name
);
576 /* This is needed so that crypt_resize() can operate correctly for pre-existing LUKS devices. We need
577 * to tell libcryptsetup the volume key explicitly, so that it is in the kernel keyring. */
578 r
= sym_crypt_activate_by_volume_key(setup
->crypt_device
, NULL
, vk
, vks
, CRYPT_ACTIVATE_KEYRING_KEY
);
580 return log_error_errno(r
, "Failed to upload volume key again: %m");
582 log_info("Successfully re-activated LUKS device.");
587 *ret_volume_key
= TAKE_PTR(vk
);
588 if (ret_volume_key_size
)
589 *ret_volume_key_size
= vks
;
594 static int fs_validate(
598 sd_id128_t
*ret_found_uuid
) {
600 _cleanup_free_
char *fstype
= NULL
;
607 r
= probe_file_system_by_path(dm_node
, &fstype
, &u
);
609 return log_error_errno(r
, "Failed to probe file system: %m");
611 /* Limit the set of supported file systems a bit, as protection against little tested kernel file
612 * systems. Also, we only support the resize ioctls for these file systems. */
613 if (!supported_fstype(fstype
))
614 return log_error_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT
), "Image contains unsupported file system: %s", strna(fstype
));
616 if (!sd_id128_is_null(uuid
) &&
617 !sd_id128_equal(uuid
, u
))
618 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "File system has wrong UUID.");
620 log_info("Probing file system completed (found %s).", fstype
);
622 *ret_fstype
= TAKE_PTR(fstype
);
624 if (ret_found_uuid
) /* Return the UUID actually found if the caller wants to know */
630 static int luks_validate(
633 sd_id128_t partition_uuid
,
634 sd_id128_t
*ret_partition_uuid
,
635 uint64_t *ret_offset
,
636 uint64_t *ret_size
) {
638 _cleanup_(blkid_free_probep
) blkid_probe b
= NULL
;
639 sd_id128_t found_partition_uuid
= SD_ID128_NULL
;
640 const char *fstype
= NULL
, *pttype
= NULL
;
641 blkid_loff_t offset
= 0, size
= 0;
651 b
= blkid_new_probe();
656 r
= blkid_probe_set_device(b
, fd
, 0, 0);
658 return errno
> 0 ? -errno
: -ENOMEM
;
660 (void) blkid_probe_enable_superblocks(b
, 1);
661 (void) blkid_probe_set_superblocks_flags(b
, BLKID_SUBLKS_TYPE
);
662 (void) blkid_probe_enable_partitions(b
, 1);
663 (void) blkid_probe_set_partitions_flags(b
, BLKID_PARTS_ENTRY_DETAILS
);
666 r
= blkid_do_safeprobe(b
);
667 if (IN_SET(r
, -2, 1)) /* nothing found or ambiguous result */
670 return errno
> 0 ? -errno
: -EIO
;
672 (void) blkid_probe_lookup_value(b
, "TYPE", &fstype
, NULL
);
673 if (streq_ptr(fstype
, "crypto_LUKS")) {
674 /* Directly a LUKS image */
676 *ret_size
= UINT64_MAX
; /* full disk */
677 *ret_partition_uuid
= SD_ID128_NULL
;
682 (void) blkid_probe_lookup_value(b
, "PTTYPE", &pttype
, NULL
);
683 if (!streq_ptr(pttype
, "gpt"))
687 pl
= blkid_probe_get_partitions(b
);
689 return errno
> 0 ? -errno
: -ENOMEM
;
692 n
= blkid_partlist_numof_partitions(pl
);
694 return errno
> 0 ? -errno
: -EIO
;
696 for (int i
= 0; i
< n
; i
++) {
698 sd_id128_t id
= SD_ID128_NULL
;
702 pp
= blkid_partlist_get_partition(pl
, i
);
704 return errno
> 0 ? -errno
: -EIO
;
706 if (id128_equal_string(blkid_partition_get_type_string(pp
), GPT_USER_HOME
) <= 0)
709 if (!streq_ptr(blkid_partition_get_name(pp
), label
))
712 sid
= blkid_partition_get_uuid(pp
);
714 r
= sd_id128_from_string(sid
, &id
);
716 log_debug_errno(r
, "Couldn't parse partition UUID %s, weird: %m", sid
);
718 if (!sd_id128_is_null(partition_uuid
) && !sd_id128_equal(id
, partition_uuid
))
725 offset
= blkid_partition_get_start(pp
);
726 size
= blkid_partition_get_size(pp
);
727 found_partition_uuid
= id
;
737 if ((uint64_t) offset
> UINT64_MAX
/ 512U)
741 if ((uint64_t) size
> UINT64_MAX
/ 512U)
744 *ret_offset
= offset
* 512U;
745 *ret_size
= size
* 512U;
746 *ret_partition_uuid
= found_partition_uuid
;
751 static int crypt_device_to_evp_cipher(struct crypt_device
*cd
, const EVP_CIPHER
**ret
) {
752 _cleanup_free_
char *cipher_name
= NULL
;
753 const char *cipher
, *cipher_mode
, *e
;
754 size_t key_size
, key_bits
;
755 const EVP_CIPHER
*cc
;
760 /* Let's find the right OpenSSL EVP_CIPHER object that matches the encryption settings of the LUKS
763 cipher
= sym_crypt_get_cipher(cd
);
765 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Cannot get cipher from LUKS device.");
767 cipher_mode
= sym_crypt_get_cipher_mode(cd
);
769 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Cannot get cipher mode from LUKS device.");
771 e
= strchr(cipher_mode
, '-');
773 cipher_mode
= strndupa_safe(cipher_mode
, e
- cipher_mode
);
775 r
= sym_crypt_get_volume_key_size(cd
);
777 return log_error_errno(r
< 0 ? r
: SYNTHETIC_ERRNO(EINVAL
), "Cannot get volume key size from LUKS device.");
780 key_bits
= key_size
* 8;
781 if (streq(cipher_mode
, "xts"))
784 if (asprintf(&cipher_name
, "%s-%zu-%s", cipher
, key_bits
, cipher_mode
) < 0)
787 cc
= EVP_get_cipherbyname(cipher_name
);
789 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP
), "Selected cipher mode '%s' not supported, can't encrypt JSON record.", cipher_name
);
791 /* Verify that our key length calculations match what OpenSSL thinks */
792 r
= EVP_CIPHER_key_length(cc
);
793 if (r
< 0 || (uint64_t) r
!= key_size
)
794 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Key size of selected cipher doesn't meet our expectations.");
800 static int luks_validate_home_record(
801 struct crypt_device
*cd
,
803 const void *volume_key
,
804 PasswordCache
*cache
,
805 UserRecord
**ret_luks_home_record
) {
812 for (int token
= 0; token
< sym_crypt_token_max(CRYPT_LUKS2
); token
++) {
813 _cleanup_(json_variant_unrefp
) JsonVariant
*v
= NULL
, *rr
= NULL
;
814 _cleanup_(EVP_CIPHER_CTX_freep
) EVP_CIPHER_CTX
*context
= NULL
;
815 _cleanup_(user_record_unrefp
) UserRecord
*lhr
= NULL
;
816 _cleanup_free_
void *encrypted
= NULL
, *iv
= NULL
;
817 size_t decrypted_size
, encrypted_size
, iv_size
;
818 int decrypted_size_out1
, decrypted_size_out2
;
819 _cleanup_free_
char *decrypted
= NULL
;
820 const char *text
, *type
;
821 crypt_token_info state
;
822 JsonVariant
*jr
, *jiv
;
823 unsigned line
, column
;
824 const EVP_CIPHER
*cc
;
826 state
= sym_crypt_token_status(cd
, token
, &type
);
827 if (state
== CRYPT_TOKEN_INACTIVE
) /* First unconfigured token, give up */
829 if (IN_SET(state
, CRYPT_TOKEN_INTERNAL
, CRYPT_TOKEN_INTERNAL_UNKNOWN
, CRYPT_TOKEN_EXTERNAL
))
831 if (state
!= CRYPT_TOKEN_EXTERNAL_UNKNOWN
)
832 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Unexpected token state of token %i: %i", token
, (int) state
);
834 if (!streq(type
, "systemd-homed"))
837 r
= sym_crypt_token_json_get(cd
, token
, &text
);
839 return log_error_errno(r
, "Failed to read LUKS token %i: %m", token
);
841 r
= json_parse(text
, JSON_PARSE_SENSITIVE
, &v
, &line
, &column
);
843 return log_error_errno(r
, "Failed to parse LUKS token JSON data %u:%u: %m", line
, column
);
845 jr
= json_variant_by_key(v
, "record");
847 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "LUKS token lacks 'record' field.");
848 jiv
= json_variant_by_key(v
, "iv");
850 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "LUKS token lacks 'iv' field.");
852 r
= json_variant_unbase64(jr
, &encrypted
, &encrypted_size
);
854 return log_error_errno(r
, "Failed to base64 decode record: %m");
856 r
= json_variant_unbase64(jiv
, &iv
, &iv_size
);
858 return log_error_errno(r
, "Failed to base64 decode IV: %m");
860 r
= crypt_device_to_evp_cipher(cd
, &cc
);
863 if (iv_size
> INT_MAX
|| EVP_CIPHER_iv_length(cc
) != (int) iv_size
)
864 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "IV size doesn't match.");
866 context
= EVP_CIPHER_CTX_new();
870 if (EVP_DecryptInit_ex(context
, cc
, NULL
, volume_key
, iv
) != 1)
871 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to initialize decryption context.");
873 decrypted_size
= encrypted_size
+ EVP_CIPHER_key_length(cc
) * 2;
874 decrypted
= new(char, decrypted_size
);
878 if (EVP_DecryptUpdate(context
, (uint8_t*) decrypted
, &decrypted_size_out1
, encrypted
, encrypted_size
) != 1)
879 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to decrypt JSON record.");
881 assert((size_t) decrypted_size_out1
<= decrypted_size
);
883 if (EVP_DecryptFinal_ex(context
, (uint8_t*) decrypted
+ decrypted_size_out1
, &decrypted_size_out2
) != 1)
884 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to finish decryption of JSON record.");
886 assert((size_t) decrypted_size_out1
+ (size_t) decrypted_size_out2
< decrypted_size
);
887 decrypted_size
= (size_t) decrypted_size_out1
+ (size_t) decrypted_size_out2
;
889 if (memchr(decrypted
, 0, decrypted_size
))
890 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Inner NUL byte in JSON record, refusing.");
892 decrypted
[decrypted_size
] = 0;
894 r
= json_parse(decrypted
, JSON_PARSE_SENSITIVE
, &rr
, NULL
, NULL
);
896 return log_error_errno(r
, "Failed to parse decrypted JSON record, refusing.");
898 lhr
= user_record_new();
902 r
= user_record_load(lhr
, rr
, USER_RECORD_LOAD_EMBEDDED
|USER_RECORD_PERMISSIVE
);
904 return log_error_errno(r
, "Failed to parse user record: %m");
906 if (!user_record_compatible(h
, lhr
))
907 return log_error_errno(SYNTHETIC_ERRNO(EREMCHG
), "LUKS home record not compatible with host record, refusing.");
909 r
= user_record_authenticate(lhr
, h
, cache
, /* strict_verify= */ true);
912 assert(r
> 0); /* Insist that a password was verified */
914 *ret_luks_home_record
= TAKE_PTR(lhr
);
918 return log_error_errno(SYNTHETIC_ERRNO(EBADMSG
), "Couldn't find home record in LUKS2 header, refusing.");
921 static int format_luks_token_text(
922 struct crypt_device
*cd
,
924 const void *volume_key
,
927 int r
, encrypted_size_out1
= 0, encrypted_size_out2
= 0, iv_size
, key_size
;
928 _cleanup_(EVP_CIPHER_CTX_freep
) EVP_CIPHER_CTX
*context
= NULL
;
929 _cleanup_(json_variant_unrefp
) JsonVariant
*v
= NULL
;
930 _cleanup_free_
void *iv
= NULL
, *encrypted
= NULL
;
931 size_t text_length
, encrypted_size
;
932 _cleanup_free_
char *text
= NULL
;
933 const EVP_CIPHER
*cc
;
940 r
= crypt_device_to_evp_cipher(cd
, &cc
);
944 key_size
= EVP_CIPHER_key_length(cc
);
945 iv_size
= EVP_CIPHER_iv_length(cc
);
948 iv
= malloc(iv_size
);
952 r
= genuine_random_bytes(iv
, iv_size
, RANDOM_BLOCK
);
954 return log_error_errno(r
, "Failed to generate IV: %m");
957 context
= EVP_CIPHER_CTX_new();
961 if (EVP_EncryptInit_ex(context
, cc
, NULL
, volume_key
, iv
) != 1)
962 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to initialize encryption context.");
964 r
= json_variant_format(hr
->json
, 0, &text
);
966 return log_error_errno(r
, "Failed to format user record for LUKS: %m");
968 text_length
= strlen(text
);
969 encrypted_size
= text_length
+ 2*key_size
- 1;
971 encrypted
= malloc(encrypted_size
);
975 if (EVP_EncryptUpdate(context
, encrypted
, &encrypted_size_out1
, (uint8_t*) text
, text_length
) != 1)
976 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to encrypt JSON record.");
978 assert((size_t) encrypted_size_out1
<= encrypted_size
);
980 if (EVP_EncryptFinal_ex(context
, (uint8_t*) encrypted
+ encrypted_size_out1
, &encrypted_size_out2
) != 1)
981 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to finish encryption of JSON record. ");
983 assert((size_t) encrypted_size_out1
+ (size_t) encrypted_size_out2
<= encrypted_size
);
987 JSON_BUILD_PAIR("type", JSON_BUILD_CONST_STRING("systemd-homed")),
988 JSON_BUILD_PAIR("keyslots", JSON_BUILD_EMPTY_ARRAY
),
989 JSON_BUILD_PAIR("record", JSON_BUILD_BASE64(encrypted
, encrypted_size_out1
+ encrypted_size_out2
)),
990 JSON_BUILD_PAIR("iv", JSON_BUILD_BASE64(iv
, iv_size
))));
992 return log_error_errno(r
, "Failed to prepare LUKS JSON token object: %m");
994 r
= json_variant_format(v
, 0, ret
);
996 return log_error_errno(r
, "Failed to format encrypted user record for LUKS: %m");
1001 int home_store_header_identity_luks(
1004 UserRecord
*old_home
) {
1006 _cleanup_(user_record_unrefp
) UserRecord
*header_home
= NULL
;
1007 _cleanup_free_
char *text
= NULL
;
1012 if (!setup
->crypt_device
)
1015 assert(setup
->volume_key
);
1017 /* Let's store the user's identity record in the LUKS2 "token" header data fields, in an encrypted
1018 * fashion. Why that? If we'd rely on the record being embedded in the payload file system itself we
1019 * would have to mount the file system before we can validate the JSON record, its signatures and
1020 * whether it matches what we are looking for. However, kernel file system implementations are
1021 * generally not ready to be used on untrusted media. Hence let's store the record independently of
1022 * the file system, so that we can validate it first, and only then mount the file system. To keep
1023 * things simple we use the same encryption settings for this record as for the file system itself. */
1025 r
= user_record_clone(h
, USER_RECORD_EXTRACT_EMBEDDED
|USER_RECORD_PERMISSIVE
, &header_home
);
1027 return log_error_errno(r
, "Failed to determine new header record: %m");
1029 if (old_home
&& user_record_equal(old_home
, header_home
)) {
1030 log_debug("Not updating header home record.");
1034 r
= format_luks_token_text(setup
->crypt_device
, header_home
, setup
->volume_key
, &text
);
1038 for (int token
= 0; token
< sym_crypt_token_max(CRYPT_LUKS2
); token
++) {
1039 crypt_token_info state
;
1042 state
= sym_crypt_token_status(setup
->crypt_device
, token
, &type
);
1043 if (state
== CRYPT_TOKEN_INACTIVE
) /* First unconfigured token, we are done */
1045 if (IN_SET(state
, CRYPT_TOKEN_INTERNAL
, CRYPT_TOKEN_INTERNAL_UNKNOWN
, CRYPT_TOKEN_EXTERNAL
))
1046 continue; /* Not ours */
1047 if (state
!= CRYPT_TOKEN_EXTERNAL_UNKNOWN
)
1048 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Unexpected token state of token %i: %i", token
, (int) state
);
1050 if (!streq(type
, "systemd-homed"))
1053 r
= sym_crypt_token_json_set(setup
->crypt_device
, token
, text
);
1055 return log_error_errno(r
, "Failed to set JSON token for slot %i: %m", token
);
1057 /* Now, let's free the text so that for all further matching tokens we all crypt_json_token_set()
1058 * with a NULL text in order to invalidate the tokens. */
1063 return log_error_errno(SYNTHETIC_ERRNO(EBADMSG
), "Didn't find any record token to update.");
1065 log_info("Wrote LUKS header user record.");
1070 int run_fitrim(int root_fd
) {
1071 struct fstrim_range range
= {
1075 /* If discarding is on, discard everything right after mounting, so that the discard setting takes
1076 * effect on activation. (Also, optionally, trim on logout) */
1078 assert(root_fd
>= 0);
1080 if (ioctl(root_fd
, FITRIM
, &range
) < 0) {
1081 if (ERRNO_IS_NOT_SUPPORTED(errno
) || errno
== EBADF
) {
1082 log_debug_errno(errno
, "File system does not support FITRIM, not trimming.");
1086 return log_warning_errno(errno
, "Failed to invoke FITRIM, ignoring: %m");
1089 log_info("Discarded unused %s.", FORMAT_BYTES(range
.len
));
1093 int run_fallocate(int backing_fd
, const struct stat
*st
) {
1096 assert(backing_fd
>= 0);
1098 /* If discarding is off, let's allocate the whole image before mounting, so that the setting takes
1099 * effect on activation */
1102 if (fstat(backing_fd
, &stbuf
) < 0)
1103 return log_error_errno(errno
, "Failed to fstat(): %m");
1108 if (!S_ISREG(st
->st_mode
))
1111 if (st
->st_blocks
>= DIV_ROUND_UP(st
->st_size
, 512)) {
1112 log_info("Backing file is fully allocated already.");
1116 if (fallocate(backing_fd
, FALLOC_FL_KEEP_SIZE
, 0, st
->st_size
) < 0) {
1118 if (ERRNO_IS_NOT_SUPPORTED(errno
)) {
1119 log_debug_errno(errno
, "fallocate() not supported on file system, ignoring.");
1123 if (ERRNO_IS_DISK_SPACE(errno
)) {
1124 log_debug_errno(errno
, "Not enough disk space to fully allocate home.");
1125 return -ENOSPC
; /* make recognizable */
1128 return log_error_errno(errno
, "Failed to allocate backing file blocks: %m");
1131 log_info("Allocated additional %s.",
1132 FORMAT_BYTES((DIV_ROUND_UP(st
->st_size
, 512) - st
->st_blocks
) * 512));
1136 int run_fallocate_by_path(const char *backing_path
) {
1137 _cleanup_close_
int backing_fd
= -1;
1139 backing_fd
= open(backing_path
, O_RDWR
|O_CLOEXEC
|O_NOCTTY
|O_NONBLOCK
);
1141 return log_error_errno(errno
, "Failed to open '%s' for fallocate(): %m", backing_path
);
1143 return run_fallocate(backing_fd
, NULL
);
1146 static int lock_image_fd(int image_fd
, const char *ip
) {
1149 /* If the $SYSTEMD_LUKS_LOCK environment variable is set we'll take an exclusive BSD lock on the
1150 * image file, and send it to our parent. homed will keep it open to ensure no other instance of
1151 * homed (across the network or such) will also mount the file. */
1153 assert(image_fd
>= 0);
1156 r
= getenv_bool("SYSTEMD_LUKS_LOCK");
1160 return log_error_errno(r
, "Failed to parse $SYSTEMD_LUKS_LOCK environment variable: %m");
1164 if (flock(image_fd
, LOCK_EX
|LOCK_NB
) < 0) {
1166 if (errno
== EWOULDBLOCK
)
1167 log_error_errno(errno
, "Image file '%s' already locked, can't use.", ip
);
1169 log_error_errno(errno
, "Failed to lock image file '%s': %m", ip
);
1171 return errno
!= EWOULDBLOCK
? -errno
: -EADDRINUSE
; /* Make error recognizable */
1174 log_info("Successfully locked image file '%s'.", ip
);
1176 /* Now send it to our parent to keep safe while the home dir is active */
1177 r
= sd_pid_notify_with_fds(0, false, "SYSTEMD_LUKS_LOCK_FD=1", &image_fd
, 1);
1179 log_warning_errno(r
, "Failed to send LUKS lock fd to parent, ignoring: %m");
1184 static int open_image_file(
1186 const char *force_image_path
,
1187 struct stat
*ret_stat
) {
1189 _cleanup_close_
int image_fd
= -1;
1194 assert(h
|| force_image_path
);
1196 ip
= force_image_path
?: user_record_image_path(h
);
1198 image_fd
= open(ip
, O_RDWR
|O_CLOEXEC
|O_NOCTTY
|O_NONBLOCK
);
1200 return log_error_errno(errno
, "Failed to open image file %s: %m", ip
);
1202 if (fstat(image_fd
, &st
) < 0)
1203 return log_error_errno(errno
, "Failed to fstat() image file: %m");
1204 if (!S_ISREG(st
.st_mode
) && !S_ISBLK(st
.st_mode
))
1205 return log_error_errno(
1206 S_ISDIR(st
.st_mode
) ? SYNTHETIC_ERRNO(EISDIR
) : SYNTHETIC_ERRNO(EBADFD
),
1207 "Image file %s is not a regular file or block device: %m", ip
);
1209 /* Locking block devices doesn't really make sense, as this might interfere with
1210 * udev's workings, and these locks aren't network propagated anyway, hence not what
1211 * we are after here. */
1212 if (S_ISREG(st
.st_mode
)) {
1213 r
= lock_image_fd(image_fd
, ip
);
1221 return TAKE_FD(image_fd
);
1224 int home_setup_luks(
1226 HomeSetupFlags flags
,
1227 const char *force_image_path
,
1229 PasswordCache
*cache
,
1230 UserRecord
**ret_luks_home
) {
1232 sd_id128_t found_partition_uuid
= SD_ID128_NULL
, found_luks_uuid
= SD_ID128_NULL
, found_fs_uuid
= SD_ID128_NULL
;
1233 _cleanup_(user_record_unrefp
) UserRecord
*luks_home
= NULL
;
1234 _cleanup_(erase_and_freep
) void *volume_key
= NULL
;
1235 size_t volume_key_size
= 0;
1236 uint64_t offset
, size
;
1242 assert(user_record_storage(h
) == USER_LUKS
);
1244 r
= dlopen_cryptsetup();
1248 r
= make_dm_names(h
, setup
);
1252 /* Reuse the image fd if it has already been opened by an earlier step */
1253 if (setup
->image_fd
< 0) {
1254 setup
->image_fd
= open_image_file(h
, force_image_path
, &st
);
1255 if (setup
->image_fd
< 0)
1256 return setup
->image_fd
;
1257 } else if (fstat(setup
->image_fd
, &st
) < 0)
1258 return log_error_errno(errno
, "Failed to stat image: %m");
1260 if (FLAGS_SET(flags
, HOME_SETUP_ALREADY_ACTIVATED
)) {
1261 struct loop_info64 info
;
1264 if (!setup
->crypt_device
) {
1275 if (ret_luks_home
) {
1276 r
= luks_validate_home_record(setup
->crypt_device
, h
, volume_key
, cache
, &luks_home
);
1281 n
= sym_crypt_get_device_name(setup
->crypt_device
);
1283 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine backing device for DM %s.", setup
->dm_name
);
1286 r
= loop_device_open(n
, O_RDWR
, &setup
->loop
);
1288 return log_error_errno(r
, "Failed to open loopback device %s: %m", n
);
1291 if (ioctl(setup
->loop
->fd
, LOOP_GET_STATUS64
, &info
) < 0) {
1292 _cleanup_free_
char *sysfs
= NULL
;
1294 if (!IN_SET(errno
, ENOTTY
, EINVAL
))
1295 return log_error_errno(errno
, "Failed to get block device metrics of %s: %m", n
);
1297 if (ioctl(setup
->loop
->fd
, BLKGETSIZE64
, &size
) < 0)
1298 return log_error_errno(r
, "Failed to read block device size of %s: %m", n
);
1300 if (fstat(setup
->loop
->fd
, &st
) < 0)
1301 return log_error_errno(r
, "Failed to stat block device %s: %m", n
);
1302 assert(S_ISBLK(st
.st_mode
));
1304 if (asprintf(&sysfs
, "/sys/dev/block/%u:%u/partition", major(st
.st_rdev
), minor(st
.st_rdev
)) < 0)
1307 if (access(sysfs
, F_OK
) < 0) {
1308 if (errno
!= ENOENT
)
1309 return log_error_errno(errno
, "Failed to determine whether %s exists: %m", sysfs
);
1313 _cleanup_free_
char *buffer
= NULL
;
1315 if (asprintf(&sysfs
, "/sys/dev/block/%u:%u/start", major(st
.st_rdev
), minor(st
.st_rdev
)) < 0)
1318 r
= read_one_line_file(sysfs
, &buffer
);
1320 return log_error_errno(r
, "Failed to read partition start offset: %m");
1322 r
= safe_atou64(buffer
, &offset
);
1324 return log_error_errno(r
, "Failed to parse partition start offset: %m");
1326 if (offset
> UINT64_MAX
/ 512U)
1327 return log_error_errno(SYNTHETIC_ERRNO(E2BIG
), "Offset too large for 64 byte range, refusing.");
1332 #if HAVE_VALGRIND_MEMCHECK_H
1333 VALGRIND_MAKE_MEM_DEFINED(&info
, sizeof(info
));
1336 offset
= info
.lo_offset
;
1337 size
= info
.lo_sizelimit
;
1340 found_partition_uuid
= found_fs_uuid
= SD_ID128_NULL
;
1342 log_info("Discovered used loopback device %s.", setup
->loop
->node
);
1344 if (setup
->root_fd
< 0) {
1345 setup
->root_fd
= open(user_record_home_directory(h
), O_RDONLY
|O_CLOEXEC
|O_DIRECTORY
|O_NOFOLLOW
);
1346 if (setup
->root_fd
< 0)
1347 return log_error_errno(errno
, "Failed to open home directory: %m");
1350 _cleanup_free_
char *fstype
= NULL
, *subdir
= NULL
;
1353 /* When we aren't reopening the home directory we are allocating it fresh, hence the relevant
1354 * objects can't be allocated yet. */
1355 assert(setup
->root_fd
< 0);
1356 assert(!setup
->crypt_device
);
1357 assert(!setup
->loop
);
1359 ip
= force_image_path
?: user_record_image_path(h
);
1361 subdir
= path_join(HOME_RUNTIME_WORK_DIR
, user_record_user_name_and_realm(h
));
1365 r
= luks_validate(setup
->image_fd
, user_record_user_name_and_realm(h
), h
->partition_uuid
, &found_partition_uuid
, &offset
, &size
);
1367 return log_error_errno(r
, "Failed to validate disk label: %m");
1369 /* Everything before this point left the image untouched. We are now starting to make
1370 * changes, hence mark the image dirty */
1371 if (run_mark_dirty(setup
->image_fd
, true) > 0)
1372 setup
->do_mark_clean
= true;
1374 if (!user_record_luks_discard(h
)) {
1375 r
= run_fallocate(setup
->image_fd
, &st
);
1380 r
= loop_device_make(setup
->image_fd
, O_RDWR
, offset
, size
, 0, &setup
->loop
);
1382 log_error_errno(r
, "Loopback block device support is not available on this system.");
1383 return -ENOLINK
; /* make recognizable */
1386 return log_error_errno(r
, "Failed to allocate loopback context: %m");
1388 log_info("Setting up loopback device %s completed.", setup
->loop
->node
?: ip
);
1391 setup
->loop
->node
?: ip
,
1395 h
->luks_cipher_mode
,
1396 h
->luks_volume_key_size
,
1399 user_record_luks_discard(h
) || user_record_luks_offline_discard(h
),
1400 &setup
->crypt_device
,
1404 &setup
->key_serial
);
1408 setup
->undo_dm
= true;
1410 if (ret_luks_home
) {
1411 r
= luks_validate_home_record(setup
->crypt_device
, h
, volume_key
, cache
, &luks_home
);
1416 r
= fs_validate(setup
->dm_node
, h
->file_system_uuid
, &fstype
, &found_fs_uuid
);
1420 r
= run_fsck(setup
->dm_node
, fstype
);
1424 r
= home_unshare_and_mount(setup
->dm_node
, fstype
, user_record_luks_discard(h
), user_record_mount_flags(h
), h
->luks_extra_mount_options
);
1428 setup
->undo_mount
= true;
1430 setup
->root_fd
= open(subdir
, O_RDONLY
|O_CLOEXEC
|O_DIRECTORY
|O_NOFOLLOW
);
1431 if (setup
->root_fd
< 0)
1432 return log_error_errno(errno
, "Failed to open home directory: %m");
1434 if (user_record_luks_discard(h
))
1435 (void) run_fitrim(setup
->root_fd
);
1437 setup
->do_offline_fallocate
= !(setup
->do_offline_fitrim
= user_record_luks_offline_discard(h
));
1440 if (!sd_id128_is_null(found_partition_uuid
))
1441 setup
->found_partition_uuid
= found_partition_uuid
;
1442 if (!sd_id128_is_null(found_luks_uuid
))
1443 setup
->found_luks_uuid
= found_luks_uuid
;
1444 if (!sd_id128_is_null(found_fs_uuid
))
1445 setup
->found_fs_uuid
= found_fs_uuid
;
1447 setup
->partition_offset
= offset
;
1448 setup
->partition_size
= size
;
1451 erase_and_free(setup
->volume_key
);
1452 setup
->volume_key
= TAKE_PTR(volume_key
);
1453 setup
->volume_key_size
= volume_key_size
;
1457 *ret_luks_home
= TAKE_PTR(luks_home
);
1462 static void print_size_summary(uint64_t host_size
, uint64_t encrypted_size
, const struct statfs
*sfs
) {
1465 log_info("Image size is %s, file system size is %s, file system payload size is %s, file system free is %s.",
1466 FORMAT_BYTES(host_size
),
1467 FORMAT_BYTES(encrypted_size
),
1468 FORMAT_BYTES((uint64_t) sfs
->f_blocks
* (uint64_t) sfs
->f_frsize
),
1469 FORMAT_BYTES((uint64_t) sfs
->f_bfree
* (uint64_t) sfs
->f_frsize
));
1472 static int home_auto_grow_luks(
1475 PasswordCache
*cache
) {
1482 if (!IN_SET(user_record_auto_resize_mode(h
), AUTO_RESIZE_GROW
, AUTO_RESIZE_SHRINK_AND_GROW
))
1485 assert(setup
->root_fd
>= 0);
1487 if (fstatfs(setup
->root_fd
, &sfs
) < 0)
1488 return log_error_errno(errno
, "Failed to statfs home directory: %m");
1490 if (!fs_can_online_shrink_and_grow(sfs
.f_type
)) {
1491 log_debug("Not auto-grow file system, since selected file system cannot do both online shrink and grow.");
1495 log_debug("Initiating auto-grow...");
1497 return home_resize_luks(
1499 HOME_SETUP_ALREADY_ACTIVATED
|
1500 HOME_SETUP_RESIZE_DONT_SYNC_IDENTITIES
|
1501 HOME_SETUP_RESIZE_DONT_SHRINK
|
1502 HOME_SETUP_RESIZE_DONT_UNDO
,
1508 int home_activate_luks(
1510 HomeSetupFlags flags
,
1512 PasswordCache
*cache
,
1513 UserRecord
**ret_home
) {
1515 _cleanup_(user_record_unrefp
) UserRecord
*new_home
= NULL
, *luks_home_record
= NULL
;
1516 uint64_t host_size
, encrypted_size
;
1517 const char *hdo
, *hd
;
1522 assert(user_record_storage(h
) == USER_LUKS
);
1526 r
= dlopen_cryptsetup();
1530 assert_se(hdo
= user_record_home_directory(h
));
1531 hd
= strdupa_safe(hdo
); /* copy the string out, since it might change later in the home record object */
1533 r
= home_get_state_luks(h
, setup
);
1537 return log_error_errno(SYNTHETIC_ERRNO(EEXIST
), "Device mapper device %s already exists, refusing.", setup
->dm_node
);
1539 r
= home_setup_luks(
1549 r
= home_auto_grow_luks(h
, setup
, cache
);
1553 r
= block_get_size_by_fd(setup
->loop
->fd
, &host_size
);
1555 return log_error_errno(r
, "Failed to get loopback block device size: %m");
1557 r
= block_get_size_by_path(setup
->dm_node
, &encrypted_size
);
1559 return log_error_errno(r
, "Failed to get LUKS block device size: %m");
1572 r
= home_extend_embedded_identity(new_home
, h
, setup
);
1576 setup
->root_fd
= safe_close(setup
->root_fd
);
1578 r
= home_move_mount(user_record_user_name_and_realm(h
), hd
);
1582 setup
->undo_mount
= false;
1583 setup
->do_offline_fitrim
= false;
1585 loop_device_relinquish(setup
->loop
);
1587 r
= sym_crypt_deactivate_by_name(NULL
, setup
->dm_name
, CRYPT_DEACTIVATE_DEFERRED
);
1589 log_warning_errno(r
, "Failed to relinquish DM device, ignoring: %m");
1591 setup
->undo_dm
= false;
1592 setup
->do_offline_fallocate
= false;
1593 setup
->do_mark_clean
= false;
1594 setup
->do_drop_caches
= false;
1595 TAKE_KEY_SERIAL(setup
->key_serial
); /* Leave key in kernel keyring */
1597 log_info("Activation completed.");
1599 print_size_summary(host_size
, encrypted_size
, &sfs
);
1601 *ret_home
= TAKE_PTR(new_home
);
1605 int home_deactivate_luks(UserRecord
*h
, HomeSetup
*setup
) {
1612 /* Note that the DM device and loopback device are set to auto-detach, hence strictly speaking we
1613 * don't have to explicitly have to detach them. However, we do that nonetheless (in case of the DM
1614 * device), to avoid races: by explicitly detaching them we know when the detaching is complete. We
1615 * don't bother about the loopback device because unlike the DM device it doesn't have a fixed
1618 if (!setup
->crypt_device
) {
1619 r
= acquire_open_luks_device(h
, setup
, /* graceful= */ true);
1621 return log_error_errno(r
, "Failed to initialize cryptsetup context for %s: %m", setup
->dm_name
);
1623 log_debug("LUKS device %s has already been detached.", setup
->dm_name
);
1624 we_detached
= false;
1628 if (setup
->crypt_device
) {
1629 log_info("Discovered used LUKS device %s.", setup
->dm_node
);
1631 cryptsetup_enable_logging(setup
->crypt_device
);
1633 r
= sym_crypt_deactivate_by_name(setup
->crypt_device
, setup
->dm_name
, 0);
1634 if (IN_SET(r
, -ENODEV
, -EINVAL
, -ENOENT
)) {
1635 log_debug_errno(r
, "LUKS device %s is already detached.", setup
->dm_node
);
1636 we_detached
= false;
1638 return log_info_errno(r
, "LUKS device %s couldn't be deactivated: %m", setup
->dm_node
);
1640 log_info("LUKS device detaching completed.");
1645 (void) wait_for_block_device_gone(setup
, USEC_PER_SEC
* 30);
1646 setup
->undo_dm
= false;
1648 if (user_record_luks_offline_discard(h
))
1649 log_debug("Not allocating on logout.");
1651 (void) run_fallocate_by_path(user_record_image_path(h
));
1653 run_mark_dirty_by_path(user_record_image_path(h
), false);
1657 int home_trim_luks(UserRecord
*h
, HomeSetup
*setup
) {
1660 assert(setup
->root_fd
>= 0);
1662 if (!user_record_luks_offline_discard(h
)) {
1663 log_debug("Not trimming on logout.");
1667 (void) run_fitrim(setup
->root_fd
);
1671 static struct crypt_pbkdf_type
* build_good_pbkdf(struct crypt_pbkdf_type
*buffer
, UserRecord
*hr
) {
1675 *buffer
= (struct crypt_pbkdf_type
) {
1676 .hash
= user_record_luks_pbkdf_hash_algorithm(hr
),
1677 .type
= user_record_luks_pbkdf_type(hr
),
1678 .time_ms
= user_record_luks_pbkdf_time_cost_usec(hr
) / USEC_PER_MSEC
,
1679 .max_memory_kb
= user_record_luks_pbkdf_memory_cost(hr
) / 1024,
1680 .parallel_threads
= user_record_luks_pbkdf_parallel_threads(hr
),
1686 static struct crypt_pbkdf_type
* build_minimal_pbkdf(struct crypt_pbkdf_type
*buffer
, UserRecord
*hr
) {
1690 /* For PKCS#11 derived keys (which are generated randomly and are of high quality already) we use a
1692 *buffer
= (struct crypt_pbkdf_type
) {
1693 .hash
= user_record_luks_pbkdf_hash_algorithm(hr
),
1694 .type
= CRYPT_KDF_PBKDF2
,
1702 static int luks_format(
1704 const char *dm_name
,
1707 const PasswordCache
*cache
,
1708 char **effective_passwords
,
1711 struct crypt_device
**ret
) {
1713 _cleanup_(user_record_unrefp
) UserRecord
*reduced
= NULL
;
1714 _cleanup_(sym_crypt_freep
) struct crypt_device
*cd
= NULL
;
1715 _cleanup_(erase_and_freep
) void *volume_key
= NULL
;
1716 struct crypt_pbkdf_type good_pbkdf
, minimal_pbkdf
;
1717 _cleanup_free_
char *text
= NULL
;
1718 size_t volume_key_size
;
1726 r
= sym_crypt_init(&cd
, node
);
1728 return log_error_errno(r
, "Failed to allocate libcryptsetup context: %m");
1730 cryptsetup_enable_logging(cd
);
1732 /* Normally we'd, just leave volume key generation to libcryptsetup. However, we can't, since we
1733 * can't extract the volume key from the library again, but we need it in order to encrypt the JSON
1734 * record. Hence, let's generate it on our own, so that we can keep track of it. */
1736 volume_key_size
= user_record_luks_volume_key_size(hr
);
1737 volume_key
= malloc(volume_key_size
);
1741 r
= genuine_random_bytes(volume_key
, volume_key_size
, RANDOM_BLOCK
);
1743 return log_error_errno(r
, "Failed to generate volume key: %m");
1745 #if HAVE_CRYPT_SET_METADATA_SIZE
1746 /* Increase the metadata space to 4M, the largest LUKS2 supports */
1747 r
= sym_crypt_set_metadata_size(cd
, 4096U*1024U, 0);
1749 return log_error_errno(r
, "Failed to change LUKS2 metadata size: %m");
1752 build_good_pbkdf(&good_pbkdf
, hr
);
1753 build_minimal_pbkdf(&minimal_pbkdf
, hr
);
1755 r
= sym_crypt_format(
1758 user_record_luks_cipher(hr
),
1759 user_record_luks_cipher_mode(hr
),
1760 SD_ID128_TO_UUID_STRING(uuid
),
1763 &(struct crypt_params_luks2
) {
1765 .subsystem
= "systemd-home",
1766 .sector_size
= 512U,
1767 .pbkdf
= &good_pbkdf
,
1770 return log_error_errno(r
, "Failed to format LUKS image: %m");
1772 log_info("LUKS formatting completed.");
1774 STRV_FOREACH(pp
, effective_passwords
) {
1776 if (password_cache_contains(cache
, *pp
)) { /* is this a fido2 or pkcs11 password? */
1777 log_debug("Using minimal PBKDF for slot %i", slot
);
1778 r
= sym_crypt_set_pbkdf_type(cd
, &minimal_pbkdf
);
1780 log_debug("Using good PBKDF for slot %i", slot
);
1781 r
= sym_crypt_set_pbkdf_type(cd
, &good_pbkdf
);
1784 return log_error_errno(r
, "Failed to tweak PBKDF for slot %i: %m", slot
);
1786 r
= sym_crypt_keyslot_add_by_volume_key(
1794 return log_error_errno(r
, "Failed to set up LUKS password for slot %i: %m", slot
);
1796 log_info("Writing password to LUKS keyslot %i completed.", slot
);
1800 r
= sym_crypt_activate_by_volume_key(
1805 discard
? CRYPT_ACTIVATE_ALLOW_DISCARDS
: 0);
1807 return log_error_errno(r
, "Failed to activate LUKS superblock: %m");
1809 log_info("LUKS activation by volume key succeeded.");
1811 r
= user_record_clone(hr
, USER_RECORD_EXTRACT_EMBEDDED
|USER_RECORD_PERMISSIVE
, &reduced
);
1813 return log_error_errno(r
, "Failed to prepare home record for LUKS: %m");
1815 r
= format_luks_token_text(cd
, reduced
, volume_key
, &text
);
1819 r
= sym_crypt_token_json_set(cd
, CRYPT_ANY_TOKEN
, text
);
1821 return log_error_errno(r
, "Failed to set LUKS JSON token: %m");
1823 log_info("Writing user record as LUKS token completed.");
1826 *ret
= TAKE_PTR(cd
);
1831 static int make_partition_table(
1835 uint64_t *ret_offset
,
1837 sd_id128_t
*ret_disk_uuid
) {
1839 _cleanup_(fdisk_unref_partitionp
) struct fdisk_partition
*p
= NULL
, *q
= NULL
;
1840 _cleanup_(fdisk_unref_parttypep
) struct fdisk_parttype
*t
= NULL
;
1841 _cleanup_(fdisk_unref_contextp
) struct fdisk_context
*c
= NULL
;
1842 _cleanup_free_
char *path
= NULL
, *disk_uuid_as_string
= NULL
;
1843 uint64_t offset
, size
, first_lba
, start
, last_lba
, end
;
1844 sd_id128_t disk_uuid
;
1852 t
= fdisk_new_parttype();
1856 r
= fdisk_parttype_set_typestr(t
, GPT_USER_HOME_STR
);
1858 return log_error_errno(r
, "Failed to initialize partition type: %m");
1860 c
= fdisk_new_context();
1864 if (asprintf(&path
, "/proc/self/fd/%i", fd
) < 0)
1867 r
= fdisk_assign_device(c
, path
, 0);
1869 return log_error_errno(r
, "Failed to open device: %m");
1871 r
= fdisk_create_disklabel(c
, "gpt");
1873 return log_error_errno(r
, "Failed to create GPT disk label: %m");
1875 p
= fdisk_new_partition();
1879 r
= fdisk_partition_set_type(p
, t
);
1881 return log_error_errno(r
, "Failed to set partition type: %m");
1883 r
= fdisk_partition_partno_follow_default(p
, 1);
1885 return log_error_errno(r
, "Failed to place partition at first free partition index: %m");
1887 first_lba
= fdisk_get_first_lba(c
); /* Boundary where usable space starts */
1888 assert(first_lba
<= UINT64_MAX
/512);
1889 start
= DISK_SIZE_ROUND_UP(first_lba
* 512); /* Round up to multiple of 4K */
1891 log_debug("Starting partition at offset %" PRIu64
, start
);
1893 if (start
== UINT64_MAX
)
1894 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
), "Overflow while rounding up start LBA.");
1896 last_lba
= fdisk_get_last_lba(c
); /* One sector before boundary where usable space ends */
1897 assert(last_lba
< UINT64_MAX
/512);
1898 end
= DISK_SIZE_ROUND_DOWN((last_lba
+ 1) * 512); /* Round down to multiple of 4K */
1901 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
), "Resulting partition size zero or negative.");
1903 r
= fdisk_partition_set_start(p
, start
/ 512);
1905 return log_error_errno(r
, "Failed to place partition at offset %" PRIu64
": %m", start
);
1907 r
= fdisk_partition_set_size(p
, (end
- start
) / 512);
1909 return log_error_errno(r
, "Failed to end partition at offset %" PRIu64
": %m", end
);
1911 r
= fdisk_partition_set_name(p
, label
);
1913 return log_error_errno(r
, "Failed to set partition name: %m");
1915 r
= fdisk_partition_set_uuid(p
, SD_ID128_TO_UUID_STRING(uuid
));
1917 return log_error_errno(r
, "Failed to set partition UUID: %m");
1919 r
= fdisk_add_partition(c
, p
, NULL
);
1921 return log_error_errno(r
, "Failed to add partition: %m");
1923 r
= fdisk_write_disklabel(c
);
1925 return log_error_errno(r
, "Failed to write disk label: %m");
1927 r
= fdisk_get_disklabel_id(c
, &disk_uuid_as_string
);
1929 return log_error_errno(r
, "Failed to determine disk label UUID: %m");
1931 r
= sd_id128_from_string(disk_uuid_as_string
, &disk_uuid
);
1933 return log_error_errno(r
, "Failed to parse disk label UUID: %m");
1935 r
= fdisk_get_partition(c
, 0, &q
);
1937 return log_error_errno(r
, "Failed to read created partition metadata: %m");
1939 assert(fdisk_partition_has_start(q
));
1940 offset
= fdisk_partition_get_start(q
);
1941 if (offset
> UINT64_MAX
/ 512U)
1942 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
), "Partition offset too large.");
1944 assert(fdisk_partition_has_size(q
));
1945 size
= fdisk_partition_get_size(q
);
1946 if (size
> UINT64_MAX
/ 512U)
1947 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
), "Partition size too large.");
1949 *ret_offset
= offset
* 512U;
1950 *ret_size
= size
* 512U;
1951 *ret_disk_uuid
= disk_uuid
;
1956 static bool supported_fs_size(const char *fstype
, uint64_t host_size
) {
1959 m
= minimal_size_by_fs_name(fstype
);
1960 if (m
== UINT64_MAX
)
1963 return host_size
>= m
;
1966 static int wait_for_devlink(const char *path
) {
1967 _cleanup_close_
int inotify_fd
= -1;
1971 /* let's wait for a device link to show up in /dev, with a timeout. This is good to do since we
1972 * return a /dev/disk/by-uuid/… link to our callers and they likely want to access it right-away,
1973 * hence let's wait until udev has caught up with our changes, and wait for the symlink to be
1976 until
= usec_add(now(CLOCK_MONOTONIC
), 45 * USEC_PER_SEC
);
1979 _cleanup_free_
char *dn
= NULL
;
1982 if (laccess(path
, F_OK
) < 0) {
1983 if (errno
!= ENOENT
)
1984 return log_error_errno(errno
, "Failed to determine whether %s exists: %m", path
);
1986 return 0; /* Found it */
1988 if (inotify_fd
< 0) {
1989 /* We need to wait for the device symlink to show up, let's create an inotify watch for it */
1990 inotify_fd
= inotify_init1(IN_NONBLOCK
|IN_CLOEXEC
);
1992 return log_error_errno(errno
, "Failed to allocate inotify fd: %m");
1995 dn
= dirname_malloc(path
);
2000 log_info("Watching %s", dn
);
2002 if (inotify_add_watch(inotify_fd
, dn
, IN_CREATE
|IN_MOVED_TO
|IN_ONLYDIR
|IN_DELETE_SELF
|IN_MOVE_SELF
) < 0) {
2003 if (errno
!= ENOENT
)
2004 return log_error_errno(errno
, "Failed to add watch on %s: %m", dn
);
2008 if (empty_or_root(dn
))
2011 dn
= dirname_malloc(dn
);
2014 w
= now(CLOCK_MONOTONIC
);
2016 return log_error_errno(SYNTHETIC_ERRNO(ETIMEDOUT
), "Device link %s still hasn't shown up, giving up.", path
);
2018 r
= fd_wait_for_event(inotify_fd
, POLLIN
, usec_sub_unsigned(until
, w
));
2020 return log_error_errno(r
, "Failed to watch inotify: %m");
2022 (void) flush_fd(inotify_fd
);
2026 static int calculate_initial_image_size(UserRecord
*h
, int image_fd
, const char *fstype
, uint64_t *ret
) {
2027 uint64_t upper_boundary
, lower_boundary
;
2031 assert(image_fd
>= 0);
2034 if (fstatfs(image_fd
, &sfs
) < 0)
2035 return log_error_errno(errno
, "statfs() on image failed: %m");
2037 upper_boundary
= DISK_SIZE_ROUND_DOWN((uint64_t) sfs
.f_bsize
* sfs
.f_bavail
);
2039 if (h
->disk_size
!= UINT64_MAX
)
2040 *ret
= MIN(DISK_SIZE_ROUND_DOWN(h
->disk_size
), upper_boundary
);
2041 else if (h
->disk_size_relative
== UINT64_MAX
) {
2043 if (upper_boundary
> UINT64_MAX
/ USER_DISK_SIZE_DEFAULT_PERCENT
)
2044 return log_error_errno(SYNTHETIC_ERRNO(EOVERFLOW
), "Disk size too large.");
2046 *ret
= DISK_SIZE_ROUND_DOWN(upper_boundary
* USER_DISK_SIZE_DEFAULT_PERCENT
/ 100);
2048 log_info("Sizing home to %u%% of available disk space, which is %s.",
2049 USER_DISK_SIZE_DEFAULT_PERCENT
,
2050 FORMAT_BYTES(*ret
));
2052 *ret
= DISK_SIZE_ROUND_DOWN((uint64_t) ((double) upper_boundary
* (double) CLAMP(h
->disk_size_relative
, 0U, UINT32_MAX
) / (double) UINT32_MAX
));
2054 log_info("Sizing home to %" PRIu64
".%01" PRIu64
"%% of available disk space, which is %s.",
2055 (h
->disk_size_relative
* 100) / UINT32_MAX
,
2056 ((h
->disk_size_relative
* 1000) / UINT32_MAX
) % 10,
2057 FORMAT_BYTES(*ret
));
2060 lower_boundary
= minimal_size_by_fs_name(fstype
);
2061 if (lower_boundary
!= UINT64_MAX
) {
2062 assert(GPT_LUKS2_OVERHEAD
< UINT64_MAX
- lower_boundary
);
2063 lower_boundary
+= GPT_LUKS2_OVERHEAD
;
2065 if (lower_boundary
== UINT64_MAX
|| lower_boundary
< USER_DISK_SIZE_MIN
)
2066 lower_boundary
= USER_DISK_SIZE_MIN
;
2068 if (*ret
< lower_boundary
)
2069 *ret
= lower_boundary
;
2074 static int home_truncate(
2085 trunc
= user_record_luks_discard(h
);
2087 r
= fallocate(fd
, 0, 0, size
);
2088 if (r
< 0 && ERRNO_IS_NOT_SUPPORTED(errno
)) {
2089 /* Some file systems do not support fallocate(), let's gracefully degrade
2090 * (ZFS, reiserfs, …) and fall back to truncation */
2091 log_notice_errno(errno
, "Backing file system does not support fallocate(), falling back to ftruncate(), i.e. implicitly using non-discard mode.");
2097 r
= ftruncate(fd
, size
);
2100 if (ERRNO_IS_DISK_SPACE(errno
)) {
2101 log_debug_errno(errno
, "Not enough disk space to allocate home of size %s.", FORMAT_BYTES(size
));
2102 return -ENOSPC
; /* make recognizable */
2105 return log_error_errno(errno
, "Failed to truncate home image: %m");
2108 return !trunc
; /* Return == 0 if we managed to truncate, > 0 if we managed to allocate */
2111 int home_create_luks(
2114 const PasswordCache
*cache
,
2115 char **effective_passwords
,
2116 UserRecord
**ret_home
) {
2118 _cleanup_free_
char *subdir
= NULL
, *disk_uuid_path
= NULL
;
2119 uint64_t encrypted_size
,
2120 host_size
= 0, partition_offset
= 0, partition_size
= 0; /* Unnecessary initialization to appease gcc */
2121 _cleanup_(user_record_unrefp
) UserRecord
*new_home
= NULL
;
2122 sd_id128_t partition_uuid
, fs_uuid
, luks_uuid
, disk_uuid
;
2123 _cleanup_close_
int mount_fd
= -1;
2124 const char *fstype
, *ip
;
2129 assert(h
->storage
< 0 || h
->storage
== USER_LUKS
);
2131 assert(!setup
->temporary_image_path
);
2132 assert(setup
->image_fd
< 0);
2135 r
= dlopen_cryptsetup();
2139 assert_se(ip
= user_record_image_path(h
));
2141 fstype
= user_record_file_system_type(h
);
2142 if (!supported_fstype(fstype
))
2143 return log_error_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT
), "Unsupported file system type: %s", fstype
);
2145 r
= mkfs_exists(fstype
);
2147 return log_error_errno(r
, "Failed to check if mkfs binary for %s exists: %m", fstype
);
2149 if (h
->file_system_type
|| streq(fstype
, "ext4") || !supported_fstype("ext4"))
2150 return log_error_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT
), "mkfs binary for file system type %s does not exist.", fstype
);
2152 /* If the record does not explicitly declare a file system to use, and the compiled-in
2153 * default does not actually exist, than do an automatic fallback onto ext4, as the baseline
2154 * fs of Linux. We won't search for a working fs type here beyond ext4, i.e. nothing fancier
2155 * than a single, conservative fallback to baseline. This should be useful in minimal
2156 * environments where mkfs.btrfs or so are not made available, but mkfs.ext4 as Linux' most
2157 * boring, most basic fs is. */
2158 log_info("Formatting tool for compiled-in default file system %s not available, falling back to ext4 instead.", fstype
);
2162 if (sd_id128_is_null(h
->partition_uuid
)) {
2163 r
= sd_id128_randomize(&partition_uuid
);
2165 return log_error_errno(r
, "Failed to acquire partition UUID: %m");
2167 partition_uuid
= h
->partition_uuid
;
2169 if (sd_id128_is_null(h
->luks_uuid
)) {
2170 r
= sd_id128_randomize(&luks_uuid
);
2172 return log_error_errno(r
, "Failed to acquire LUKS UUID: %m");
2174 luks_uuid
= h
->luks_uuid
;
2176 if (sd_id128_is_null(h
->file_system_uuid
)) {
2177 r
= sd_id128_randomize(&fs_uuid
);
2179 return log_error_errno(r
, "Failed to acquire file system UUID: %m");
2181 fs_uuid
= h
->file_system_uuid
;
2183 r
= make_dm_names(h
, setup
);
2187 r
= access(setup
->dm_node
, F_OK
);
2189 if (errno
!= ENOENT
)
2190 return log_error_errno(errno
, "Failed to determine whether %s exists: %m", setup
->dm_node
);
2192 return log_error_errno(SYNTHETIC_ERRNO(EEXIST
), "Device mapper device %s already exists, refusing.", setup
->dm_node
);
2194 if (path_startswith(ip
, "/dev/")) {
2195 _cleanup_free_
char *sysfs
= NULL
;
2196 uint64_t block_device_size
;
2199 /* Let's place the home directory on a real device, i.e. an USB stick or such */
2201 setup
->image_fd
= open_image_file(h
, ip
, &st
);
2202 if (setup
->image_fd
< 0)
2203 return setup
->image_fd
;
2205 if (!S_ISBLK(st
.st_mode
))
2206 return log_error_errno(SYNTHETIC_ERRNO(ENOTBLK
), "Device is not a block device, refusing.");
2208 if (asprintf(&sysfs
, "/sys/dev/block/%u:%u/partition", major(st
.st_rdev
), minor(st
.st_rdev
)) < 0)
2210 if (access(sysfs
, F_OK
) < 0) {
2211 if (errno
!= ENOENT
)
2212 return log_error_errno(errno
, "Failed to check whether %s exists: %m", sysfs
);
2214 return log_error_errno(SYNTHETIC_ERRNO(ENOTBLK
), "Operating on partitions is currently not supported, sorry. Please specify a top-level block device.");
2216 if (flock(setup
->image_fd
, LOCK_EX
) < 0) /* make sure udev doesn't read from it while we operate on the device */
2217 return log_error_errno(errno
, "Failed to lock block device %s: %m", ip
);
2219 if (ioctl(setup
->image_fd
, BLKGETSIZE64
, &block_device_size
) < 0)
2220 return log_error_errno(errno
, "Failed to read block device size: %m");
2222 if (h
->disk_size
== UINT64_MAX
) {
2224 /* If a relative disk size is requested, apply it relative to the block device size */
2225 if (h
->disk_size_relative
< UINT32_MAX
)
2226 host_size
= CLAMP(DISK_SIZE_ROUND_DOWN(block_device_size
* h
->disk_size_relative
/ UINT32_MAX
),
2227 USER_DISK_SIZE_MIN
, USER_DISK_SIZE_MAX
);
2229 host_size
= block_device_size
; /* Otherwise, take the full device */
2231 } else if (h
->disk_size
> block_device_size
)
2232 return log_error_errno(SYNTHETIC_ERRNO(EMSGSIZE
), "Selected disk size larger than backing block device, refusing.");
2234 host_size
= DISK_SIZE_ROUND_DOWN(h
->disk_size
);
2236 if (!supported_fs_size(fstype
, LESS_BY(host_size
, GPT_LUKS2_OVERHEAD
)))
2237 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
),
2238 "Selected file system size too small for %s.", fstype
);
2240 /* After creation we should reference this partition by its UUID instead of the block
2241 * device. That's preferable since the user might have specified a device node such as
2242 * /dev/sdb to us, which might look very different when replugged. */
2243 if (asprintf(&disk_uuid_path
, "/dev/disk/by-uuid/" SD_ID128_UUID_FORMAT_STR
, SD_ID128_FORMAT_VAL(luks_uuid
)) < 0)
2246 if (user_record_luks_discard(h
) || user_record_luks_offline_discard(h
)) {
2247 /* If we want online or offline discard, discard once before we start using things. */
2249 if (ioctl(setup
->image_fd
, BLKDISCARD
, (uint64_t[]) { 0, block_device_size
}) < 0)
2250 log_full_errno(errno
== EOPNOTSUPP
? LOG_DEBUG
: LOG_WARNING
, errno
,
2251 "Failed to issue full-device BLKDISCARD on device, ignoring: %m");
2253 log_info("Full device discard completed.");
2256 _cleanup_free_
char *t
= NULL
;
2258 r
= mkdir_parents(ip
, 0755);
2260 return log_error_errno(r
, "Failed to create parent directory of %s: %m", ip
);
2262 r
= tempfn_random(ip
, "homework", &t
);
2264 return log_error_errno(r
, "Failed to derive temporary file name for %s: %m", ip
);
2266 setup
->image_fd
= open(t
, O_RDWR
|O_CREAT
|O_EXCL
|O_CLOEXEC
|O_NOCTTY
|O_NOFOLLOW
, 0600);
2267 if (setup
->image_fd
< 0)
2268 return log_error_errno(errno
, "Failed to create home image %s: %m", t
);
2270 setup
->temporary_image_path
= TAKE_PTR(t
);
2272 r
= chattr_full(t
, setup
->image_fd
, FS_NOCOW_FL
|FS_NOCOMP_FL
, FS_NOCOW_FL
|FS_NOCOMP_FL
, NULL
, NULL
, CHATTR_FALLBACK_BITWISE
);
2273 if (r
< 0 && r
!= -ENOANO
) /* ENOANO → some bits didn't work; which we skip logging about because chattr_full() already debug logs about those flags */
2274 log_full_errno(ERRNO_IS_NOT_SUPPORTED(r
) ? LOG_DEBUG
: LOG_WARNING
, r
,
2275 "Failed to set file attributes on %s, ignoring: %m", setup
->temporary_image_path
);
2277 r
= calculate_initial_image_size(h
, setup
->image_fd
, fstype
, &host_size
);
2281 r
= resize_image_loop(h
, setup
, 0, host_size
, &host_size
);
2285 log_info("Allocating image file completed.");
2288 r
= make_partition_table(
2290 user_record_user_name_and_realm(h
),
2298 log_info("Writing of partition table completed.");
2300 r
= loop_device_make(setup
->image_fd
, O_RDWR
, partition_offset
, partition_size
, 0, &setup
->loop
);
2302 if (r
== -ENOENT
) { /* this means /dev/loop-control doesn't exist, i.e. we are in a container
2303 * or similar and loopback bock devices are not available, return a
2304 * recognizable error in this case. */
2305 log_error_errno(r
, "Loopback block device support is not available on this system.");
2306 return -ENOLINK
; /* Make recognizable */
2309 return log_error_errno(r
, "Failed to set up loopback device for %s: %m", setup
->temporary_image_path
);
2312 r
= loop_device_flock(setup
->loop
, LOCK_EX
); /* make sure udev won't read before we are done */
2314 return log_error_errno(r
, "Failed to take lock on loop device: %m");
2316 log_info("Setting up loopback device %s completed.", setup
->loop
->node
?: ip
);
2318 r
= luks_format(setup
->loop
->node
,
2321 user_record_user_name_and_realm(h
),
2323 effective_passwords
,
2324 user_record_luks_discard(h
) || user_record_luks_offline_discard(h
),
2326 &setup
->crypt_device
);
2330 setup
->undo_dm
= true;
2332 r
= block_get_size_by_path(setup
->dm_node
, &encrypted_size
);
2334 return log_error_errno(r
, "Failed to get encrypted block device size: %m");
2336 log_info("Setting up LUKS device %s completed.", setup
->dm_node
);
2338 r
= make_filesystem(setup
->dm_node
, fstype
, user_record_user_name_and_realm(h
), fs_uuid
, user_record_luks_discard(h
));
2342 log_info("Formatting file system completed.");
2344 r
= home_unshare_and_mount(setup
->dm_node
, fstype
, user_record_luks_discard(h
), user_record_mount_flags(h
), h
->luks_extra_mount_options
);
2348 setup
->undo_mount
= true;
2350 subdir
= path_join(HOME_RUNTIME_WORK_DIR
, user_record_user_name_and_realm(h
));
2354 /* Prefer using a btrfs subvolume if we can, fall back to directory otherwise */
2355 r
= btrfs_subvol_make_fallback(subdir
, 0700);
2357 return log_error_errno(r
, "Failed to create user directory in mounted image file: %m");
2359 setup
->root_fd
= open(subdir
, O_RDONLY
|O_CLOEXEC
|O_DIRECTORY
|O_NOFOLLOW
);
2360 if (setup
->root_fd
< 0)
2361 return log_error_errno(errno
, "Failed to open user directory in mounted image file: %m");
2363 (void) home_shift_uid(setup
->root_fd
, NULL
, UID_NOBODY
, h
->uid
, &mount_fd
);
2365 if (mount_fd
>= 0) {
2366 /* If we have established a new mount, then we can use that as new root fd to our home directory. */
2367 safe_close(setup
->root_fd
);
2369 setup
->root_fd
= fd_reopen(mount_fd
, O_RDONLY
|O_CLOEXEC
|O_DIRECTORY
);
2370 if (setup
->root_fd
< 0)
2371 return log_error_errno(setup
->root_fd
, "Unable to convert mount fd into proper directory fd: %m");
2373 mount_fd
= safe_close(mount_fd
);
2376 r
= home_populate(h
, setup
->root_fd
);
2380 r
= home_sync_and_statfs(setup
->root_fd
, &sfs
);
2384 r
= user_record_clone(h
, USER_RECORD_LOAD_MASK_SECRET
|USER_RECORD_LOG
|USER_RECORD_PERMISSIVE
, &new_home
);
2386 return log_error_errno(r
, "Failed to clone record: %m");
2388 r
= user_record_add_binding(
2391 disk_uuid_path
?: ip
,
2395 sym_crypt_get_cipher(setup
->crypt_device
),
2396 sym_crypt_get_cipher_mode(setup
->crypt_device
),
2397 luks_volume_key_size_convert(setup
->crypt_device
),
2403 return log_error_errno(r
, "Failed to add binding to record: %m");
2405 if (user_record_luks_offline_discard(h
)) {
2406 r
= run_fitrim(setup
->root_fd
);
2411 setup
->root_fd
= safe_close(setup
->root_fd
);
2413 r
= home_setup_undo_mount(setup
, LOG_ERR
);
2417 r
= home_setup_undo_dm(setup
, LOG_ERR
);
2421 setup
->loop
= loop_device_unref(setup
->loop
);
2423 if (!user_record_luks_offline_discard(h
)) {
2424 r
= run_fallocate(setup
->image_fd
, NULL
/* refresh stat() data */);
2429 /* Sync everything to disk before we move things into place under the final name. */
2430 if (fsync(setup
->image_fd
) < 0)
2431 return log_error_errno(r
, "Failed to synchronize image to disk: %m");
2434 /* Reread partition table if this is a block device */
2435 (void) ioctl(setup
->image_fd
, BLKRRPART
, 0);
2437 assert(setup
->temporary_image_path
);
2439 if (rename(setup
->temporary_image_path
, ip
) < 0)
2440 return log_error_errno(errno
, "Failed to rename image file: %m");
2442 setup
->temporary_image_path
= mfree(setup
->temporary_image_path
);
2444 /* If we operate on a file, sync the containing directory too. */
2445 r
= fsync_directory_of_file(setup
->image_fd
);
2447 return log_error_errno(r
, "Failed to synchronize directory of image file to disk: %m");
2449 log_info("Moved image file into place.");
2452 /* Let's close the image fd now. If we are operating on a real block device this will release the BSD
2453 * lock that ensures udev doesn't interfere with what we are doing */
2454 setup
->image_fd
= safe_close(setup
->image_fd
);
2457 (void) wait_for_devlink(disk_uuid_path
);
2459 log_info("Creation completed.");
2461 print_size_summary(host_size
, encrypted_size
, &sfs
);
2463 log_debug("GPT + LUKS2 overhead is %" PRIu64
" (expected %" PRIu64
")", host_size
- encrypted_size
, GPT_LUKS2_OVERHEAD
);
2465 *ret_home
= TAKE_PTR(new_home
);
2469 int home_get_state_luks(UserRecord
*h
, HomeSetup
*setup
) {
2475 r
= make_dm_names(h
, setup
);
2479 r
= access(setup
->dm_node
, F_OK
);
2480 if (r
< 0 && errno
!= ENOENT
)
2481 return log_error_errno(errno
, "Failed to determine whether %s exists: %m", setup
->dm_node
);
2491 static int can_resize_fs(int fd
, uint64_t old_size
, uint64_t new_size
) {
2496 /* Filter out bogus requests early */
2497 if (old_size
== 0 || old_size
== UINT64_MAX
||
2498 new_size
== 0 || new_size
== UINT64_MAX
)
2499 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Invalid resize parameters.");
2501 if ((old_size
& 511) != 0 || (new_size
& 511) != 0)
2502 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Resize parameters not multiple of 512.");
2504 if (fstatfs(fd
, &sfs
) < 0)
2505 return log_error_errno(errno
, "Failed to fstatfs() file system: %m");
2507 if (is_fs_type(&sfs
, BTRFS_SUPER_MAGIC
)) {
2509 if (new_size
< BTRFS_MINIMAL_SIZE
)
2510 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
), "New file system size too small for btrfs (needs to be 256M at least.");
2512 /* btrfs can grow and shrink online */
2514 } else if (is_fs_type(&sfs
, XFS_SB_MAGIC
)) {
2516 if (new_size
< XFS_MINIMAL_SIZE
)
2517 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
), "New file system size too small for xfs (needs to be 14M at least).");
2519 /* XFS can grow, but not shrink */
2520 if (new_size
< old_size
)
2521 return log_error_errno(SYNTHETIC_ERRNO(EMSGSIZE
), "Shrinking this type of file system is not supported.");
2523 } else if (is_fs_type(&sfs
, EXT4_SUPER_MAGIC
)) {
2525 if (new_size
< EXT4_MINIMAL_SIZE
)
2526 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
), "New file system size too small for ext4 (needs to be 1M at least).");
2528 /* ext4 can grow online, and shrink offline */
2529 if (new_size
< old_size
)
2530 return CAN_RESIZE_OFFLINE
;
2533 return log_error_errno(SYNTHETIC_ERRNO(ESOCKTNOSUPPORT
), "Resizing this type of file system is not supported.");
2535 return CAN_RESIZE_ONLINE
;
2538 static int ext4_offline_resize_fs(
2542 unsigned long flags
,
2543 const char *extra_mount_options
) {
2545 _cleanup_free_
char *size_str
= NULL
;
2546 bool re_open
= false, re_mount
= false;
2547 pid_t resize_pid
, fsck_pid
;
2551 assert(setup
->dm_node
);
2553 /* First, unmount the file system */
2554 if (setup
->root_fd
>= 0) {
2555 setup
->root_fd
= safe_close(setup
->root_fd
);
2559 if (setup
->undo_mount
) {
2560 r
= home_setup_undo_mount(setup
, LOG_ERR
);
2567 log_info("Temporary unmounting of file system completed.");
2569 /* resize2fs requires that the file system is force checked first, do so. */
2570 r
= safe_fork("(e2fsck)",
2571 FORK_RESET_SIGNALS
|FORK_RLIMIT_NOFILE_SAFE
|FORK_DEATHSIG
|FORK_LOG
|FORK_STDOUT_TO_STDERR
|FORK_CLOSE_ALL_FDS
,
2577 execlp("e2fsck" ,"e2fsck", "-fp", setup
->dm_node
, NULL
);
2579 log_error_errno(errno
, "Failed to execute e2fsck: %m");
2580 _exit(EXIT_FAILURE
);
2583 exit_status
= wait_for_terminate_and_check("e2fsck", fsck_pid
, WAIT_LOG_ABNORMAL
);
2584 if (exit_status
< 0)
2586 if ((exit_status
& ~FSCK_ERROR_CORRECTED
) != 0) {
2587 log_warning("e2fsck failed with exit status %i.", exit_status
);
2589 if ((exit_status
& (FSCK_SYSTEM_SHOULD_REBOOT
|FSCK_ERRORS_LEFT_UNCORRECTED
)) != 0)
2590 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "File system is corrupted, refusing.");
2592 log_warning("Ignoring fsck error.");
2595 log_info("Forced file system check completed.");
2597 /* We use 512 sectors here, because resize2fs doesn't do byte sizes */
2598 if (asprintf(&size_str
, "%" PRIu64
"s", new_size
/ 512) < 0)
2601 /* Resize the thing */
2602 r
= safe_fork("(e2resize)",
2603 FORK_RESET_SIGNALS
|FORK_RLIMIT_NOFILE_SAFE
|FORK_DEATHSIG
|FORK_LOG
|FORK_WAIT
|FORK_STDOUT_TO_STDERR
|FORK_CLOSE_ALL_FDS
,
2609 execlp("resize2fs" ,"resize2fs", setup
->dm_node
, size_str
, NULL
);
2611 log_error_errno(errno
, "Failed to execute resize2fs: %m");
2612 _exit(EXIT_FAILURE
);
2615 log_info("Offline file system resize completed.");
2617 /* Re-establish mounts and reopen the directory */
2619 r
= home_mount_node(setup
->dm_node
, "ext4", discard
, flags
, extra_mount_options
);
2623 setup
->undo_mount
= true;
2627 setup
->root_fd
= open(HOME_RUNTIME_WORK_DIR
, O_RDONLY
|O_CLOEXEC
|O_DIRECTORY
|O_NOFOLLOW
);
2628 if (setup
->root_fd
< 0)
2629 return log_error_errno(errno
, "Failed to reopen file system: %m");
2632 log_info("File system mounted again.");
2637 static int prepare_resize_partition(
2639 uint64_t partition_offset
,
2640 uint64_t old_partition_size
,
2641 sd_id128_t
*ret_disk_uuid
,
2642 struct fdisk_table
**ret_table
,
2643 struct fdisk_partition
**ret_partition
) {
2645 _cleanup_(fdisk_unref_contextp
) struct fdisk_context
*c
= NULL
;
2646 _cleanup_(fdisk_unref_tablep
) struct fdisk_table
*t
= NULL
;
2647 _cleanup_free_
char *path
= NULL
, *disk_uuid_as_string
= NULL
;
2648 struct fdisk_partition
*found
= NULL
;
2649 sd_id128_t disk_uuid
;
2650 size_t n_partitions
;
2654 assert(ret_disk_uuid
);
2657 assert((partition_offset
& 511) == 0);
2658 assert((old_partition_size
& 511) == 0);
2659 assert(UINT64_MAX
- old_partition_size
>= partition_offset
);
2661 if (partition_offset
== 0) {
2662 /* If the offset is at the beginning we assume no partition table, let's exit early. */
2663 log_debug("Not rewriting partition table, operating on naked device.");
2664 *ret_disk_uuid
= SD_ID128_NULL
;
2669 c
= fdisk_new_context();
2673 if (asprintf(&path
, "/proc/self/fd/%i", fd
) < 0)
2676 r
= fdisk_assign_device(c
, path
, 0);
2678 return log_error_errno(r
, "Failed to open device: %m");
2680 if (!fdisk_is_labeltype(c
, FDISK_DISKLABEL_GPT
))
2681 return log_error_errno(SYNTHETIC_ERRNO(ENOMEDIUM
), "Disk has no GPT partition table.");
2683 r
= fdisk_get_disklabel_id(c
, &disk_uuid_as_string
);
2685 return log_error_errno(r
, "Failed to acquire disk UUID: %m");
2687 r
= sd_id128_from_string(disk_uuid_as_string
, &disk_uuid
);
2689 return log_error_errno(r
, "Failed parse disk UUID: %m");
2691 r
= fdisk_get_partitions(c
, &t
);
2693 return log_error_errno(r
, "Failed to acquire partition table: %m");
2695 n_partitions
= fdisk_table_get_nents(t
);
2696 for (size_t i
= 0; i
< n_partitions
; i
++) {
2697 struct fdisk_partition
*p
;
2699 p
= fdisk_table_get_partition(t
, i
);
2701 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "Failed to read partition metadata: %m");
2703 if (fdisk_partition_is_used(p
) <= 0)
2705 if (fdisk_partition_has_start(p
) <= 0 || fdisk_partition_has_size(p
) <= 0 || fdisk_partition_has_end(p
) <= 0)
2706 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Found partition without a size.");
2708 if (fdisk_partition_get_start(p
) == partition_offset
/ 512U &&
2709 fdisk_partition_get_size(p
) == old_partition_size
/ 512U) {
2712 return log_error_errno(SYNTHETIC_ERRNO(ENOTUNIQ
), "Partition found twice, refusing.");
2715 } else if (fdisk_partition_get_end(p
) > partition_offset
/ 512U)
2716 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Can't extend, not last partition in image.");
2720 return log_error_errno(SYNTHETIC_ERRNO(ENOPKG
), "Failed to find matching partition to resize.");
2722 *ret_disk_uuid
= disk_uuid
;
2723 *ret_table
= TAKE_PTR(t
);
2724 *ret_partition
= found
;
2729 static int ask_cb(struct fdisk_context
*c
, struct fdisk_ask
*ask
, void *userdata
) {
2734 switch (fdisk_ask_get_type(ask
)) {
2736 case FDISK_ASKTYPE_STRING
:
2737 result
= new(char, 37);
2741 fdisk_ask_string_set_result(ask
, sd_id128_to_uuid_string(*(sd_id128_t
*) userdata
, result
));
2745 log_debug("Unexpected question from libfdisk, ignoring.");
2751 static int apply_resize_partition(
2753 sd_id128_t disk_uuids
,
2754 struct fdisk_table
*t
,
2755 struct fdisk_partition
*p
,
2756 size_t new_partition_size
) {
2758 _cleanup_(fdisk_unref_contextp
) struct fdisk_context
*c
= NULL
;
2759 _cleanup_free_
void *two_zero_lbas
= NULL
;
2760 _cleanup_free_
char *path
= NULL
;
2767 if (!t
) /* no partition table to apply, exit early */
2772 /* Before writing our partition patch the final size in */
2773 r
= fdisk_partition_size_explicit(p
, 1);
2775 return log_error_errno(r
, "Failed to enable explicit partition size: %m");
2777 r
= fdisk_partition_set_size(p
, new_partition_size
/ 512U);
2779 return log_error_errno(r
, "Failed to change partition size: %m");
2781 two_zero_lbas
= malloc0(1024U);
2785 /* libfdisk appears to get confused by the existing PMBR. Let's explicitly flush it out. */
2786 n
= pwrite(fd
, two_zero_lbas
, 1024U, 0);
2788 return log_error_errno(errno
, "Failed to wipe partition table: %m");
2790 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "Short write while wiping partition table.");
2792 c
= fdisk_new_context();
2796 if (asprintf(&path
, "/proc/self/fd/%i", fd
) < 0)
2799 r
= fdisk_assign_device(c
, path
, 0);
2801 return log_error_errno(r
, "Failed to open device: %m");
2803 r
= fdisk_create_disklabel(c
, "gpt");
2805 return log_error_errno(r
, "Failed to create GPT disk label: %m");
2807 r
= fdisk_apply_table(c
, t
);
2809 return log_error_errno(r
, "Failed to apply partition table: %m");
2811 r
= fdisk_set_ask(c
, ask_cb
, &disk_uuids
);
2813 return log_error_errno(r
, "Failed to set libfdisk query function: %m");
2815 r
= fdisk_set_disklabel_id(c
);
2817 return log_error_errno(r
, "Failed to change disklabel ID: %m");
2819 r
= fdisk_write_disklabel(c
);
2821 return log_error_errno(r
, "Failed to write disk label: %m");
2826 /* Always keep at least 16M free, so that we can safely log in and update the user record while doing so */
2827 #define HOME_MIN_FREE (16U*1024U*1024U)
2829 static int get_smallest_fs_size(int fd
, uint64_t *ret
) {
2830 uint64_t minsz
, needed
;
2836 /* Determines the minimal disk size we might be able to shrink the file system referenced by the fd to. */
2838 if (syncfs(fd
) < 0) /* let's sync before we query the size, so that the values returned are accurate */
2839 return log_error_errno(errno
, "Failed to synchronize home file system: %m");
2841 if (fstatfs(fd
, &sfs
) < 0)
2842 return log_error_errno(errno
, "Failed to statfs() home file system: %m");
2844 /* Let's determine the minimal file system size of the used fstype */
2845 minsz
= minimal_size_by_fs_magic(sfs
.f_type
);
2846 if (minsz
== UINT64_MAX
)
2847 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP
), "Don't know minimum file system size of file system type '%s' of home directory.", fs_type_to_string(sfs
.f_type
));
2849 if (minsz
< USER_DISK_SIZE_MIN
)
2850 minsz
= USER_DISK_SIZE_MIN
;
2852 if (sfs
.f_bfree
> sfs
.f_blocks
)
2853 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Detected amount of free blocks is greater than the total amount of file system blocks. Refusing.");
2855 /* Calculate how much disk space is currently in use. */
2856 needed
= sfs
.f_blocks
- sfs
.f_bfree
;
2857 if (needed
> UINT64_MAX
/ sfs
.f_bsize
)
2858 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "File system size out of range.");
2860 needed
*= sfs
.f_bsize
;
2862 /* Add some safety margin of free space we'll always keep */
2863 if (needed
> UINT64_MAX
- HOME_MIN_FREE
) /* Check for overflow */
2864 needed
= UINT64_MAX
;
2866 needed
+= HOME_MIN_FREE
;
2868 *ret
= DISK_SIZE_ROUND_UP(MAX(needed
, minsz
));
2872 static int get_largest_image_size(int fd
, const struct stat
*st
, uint64_t *ret
) {
2873 uint64_t used
, avail
, sum
;
2881 /* Determines the maximum file size we might be able to grow the image file referenced by the fd to. */
2883 r
= stat_verify_regular(st
);
2885 return log_error_errno(r
, "Image file is not a regular file, refusing: %m");
2888 return log_error_errno(errno
, "Failed to synchronize file system backing image file: %m");
2890 if (fstatfs(fd
, &sfs
) < 0)
2891 return log_error_errno(errno
, "Failed to statfs() image file: %m");
2893 used
= (uint64_t) st
->st_blocks
* 512;
2894 avail
= (uint64_t) sfs
.f_bsize
* sfs
.f_bavail
;
2896 if (avail
> UINT64_MAX
- used
)
2901 *ret
= DISK_SIZE_ROUND_DOWN(MIN(sum
, USER_DISK_SIZE_MAX
));
2905 static int resize_fs_loop(
2909 uint64_t old_fs_size
,
2910 uint64_t new_fs_size
,
2911 uint64_t *ret_fs_size
) {
2913 uint64_t current_fs_size
;
2914 unsigned n_iterations
= 0;
2919 assert(setup
->root_fd
>= 0);
2921 /* A bisection loop trying to find the closest size to what the user asked for. (Well, we bisect like
2922 * this only when we *shrink* the fs — if we grow the fs there's no need to bisect.) */
2924 current_fs_size
= old_fs_size
;
2925 for (uint64_t lower_boundary
= new_fs_size
, upper_boundary
= old_fs_size
, try_fs_size
= new_fs_size
;;) {
2930 /* Now resize the file system */
2931 if (resize_type
== CAN_RESIZE_ONLINE
) {
2932 r
= resize_fs(setup
->root_fd
, try_fs_size
, NULL
);
2934 if (!ERRNO_IS_DISK_SPACE(r
) || new_fs_size
> old_fs_size
) /* Not a disk space issue? Not trying to shrink? */
2935 return log_error_errno(r
, "Failed to resize file system: %m");
2937 log_debug_errno(r
, "Shrinking from %s to %s didn't work, not enough space for contained data.", FORMAT_BYTES(current_fs_size
), FORMAT_BYTES(try_fs_size
));
2940 log_debug("Successfully resized from %s to %s.", FORMAT_BYTES(current_fs_size
), FORMAT_BYTES(try_fs_size
));
2941 current_fs_size
= try_fs_size
;
2945 /* If we hit a disk space issue and are shrinking the fs, then maybe it helps to
2946 * increase the image size. */
2948 r
= ext4_offline_resize_fs(setup
, try_fs_size
, user_record_luks_discard(h
), user_record_mount_flags(h
), h
->luks_extra_mount_options
);
2952 /* For now, when we fail to shrink an ext4 image we'll not try again via the
2953 * bisection logic. We might add that later, but give this involves shelling out
2954 * multiple programs it's a bit too cumbersome to my taste. */
2957 current_fs_size
= try_fs_size
;
2960 if (new_fs_size
> old_fs_size
) /* If we are growing we are done after one iteration */
2963 /* If we are shrinking then let's adjust our bisection boundaries and try again. */
2965 upper_boundary
= MIN(upper_boundary
, try_fs_size
);
2967 lower_boundary
= MAX(lower_boundary
, try_fs_size
);
2969 /* OK, this attempt to shrink didn't work. Let's try between the old size and what worked. */
2970 if (lower_boundary
>= upper_boundary
) {
2971 log_debug("Image can't be shrunk further (range to try is empty).");
2975 /* Let's find a new value to try half-way between the lower boundary and the upper boundary
2977 try_fs_size
= DISK_SIZE_ROUND_DOWN(lower_boundary
+ (upper_boundary
- lower_boundary
) / 2);
2978 if (try_fs_size
<= lower_boundary
|| try_fs_size
>= upper_boundary
) {
2979 log_debug("Image can't be shrunk further (remaining range to try too small).");
2984 log_debug("Bisection loop completed after %u iterations.", n_iterations
);
2987 *ret_fs_size
= current_fs_size
;
2992 static int resize_image_loop(
2995 uint64_t old_image_size
,
2996 uint64_t new_image_size
,
2997 uint64_t *ret_image_size
) {
2999 uint64_t current_image_size
;
3000 unsigned n_iterations
= 0;
3005 assert(setup
->image_fd
>= 0);
3007 /* A bisection loop trying to find the closest size to what the user asked for. (Well, we bisect like
3008 * this only when we *grow* the image — if we shrink the image then there's no need to bisect.) */
3010 current_image_size
= old_image_size
;
3011 for (uint64_t lower_boundary
= old_image_size
, upper_boundary
= new_image_size
, try_image_size
= new_image_size
;;) {
3016 r
= home_truncate(h
, setup
->image_fd
, try_image_size
);
3018 if (!ERRNO_IS_DISK_SPACE(r
) || new_image_size
< old_image_size
) /* Not a disk space issue? Not trying to grow? */
3021 log_debug_errno(r
, "Growing from %s to %s didn't work, not enough space on backing disk.", FORMAT_BYTES(current_image_size
), FORMAT_BYTES(try_image_size
));
3023 } else if (r
> 0) { /* Success: allocation worked */
3024 log_debug("Resizing from %s to %s via allocation worked successfully.", FORMAT_BYTES(current_image_size
), FORMAT_BYTES(try_image_size
));
3025 current_image_size
= try_image_size
;
3027 } else { /* Success, but through truncation, not allocation. */
3028 log_debug("Resizing from %s to %s via truncation worked successfully.", FORMAT_BYTES(old_image_size
), FORMAT_BYTES(try_image_size
));
3029 current_image_size
= try_image_size
;
3030 break; /* there's no point in the bisection logic if this was plain truncation and
3031 * not allocation, let's exit immediately. */
3034 if (new_image_size
< old_image_size
) /* If we are shrinking we are done after one iteration */
3037 /* If we are growing then let's adjust our bisection boundaries and try again */
3039 lower_boundary
= MAX(lower_boundary
, try_image_size
);
3041 upper_boundary
= MIN(upper_boundary
, try_image_size
);
3043 if (lower_boundary
>= upper_boundary
) {
3044 log_debug("Image can't be grown further (range to try is empty).");
3048 try_image_size
= DISK_SIZE_ROUND_DOWN(lower_boundary
+ (upper_boundary
- lower_boundary
) / 2);
3049 if (try_image_size
<= lower_boundary
|| try_image_size
>= upper_boundary
) {
3050 log_debug("Image can't be grown further (remaining range to try too small).");
3055 log_debug("Bisection loop completed after %u iterations.", n_iterations
);
3058 *ret_image_size
= current_image_size
;
3063 int home_resize_luks(
3065 HomeSetupFlags flags
,
3067 PasswordCache
*cache
,
3068 UserRecord
**ret_home
) {
3070 uint64_t old_image_size
, new_image_size
, old_fs_size
, new_fs_size
, crypto_offset
, crypto_offset_bytes
,
3071 new_partition_size
, smallest_fs_size
, resized_fs_size
;
3072 _cleanup_(user_record_unrefp
) UserRecord
*header_home
= NULL
, *embedded_home
= NULL
, *new_home
= NULL
;
3073 _cleanup_(fdisk_unref_tablep
) struct fdisk_table
*table
= NULL
;
3074 struct fdisk_partition
*partition
= NULL
;
3075 _cleanup_close_
int opened_image_fd
= -1;
3076 _cleanup_free_
char *whole_disk
= NULL
;
3077 int r
, resize_type
, image_fd
= -1;
3078 sd_id128_t disk_uuid
;
3079 const char *ip
, *ipo
;
3083 INTENTION_DONT_KNOW
= 0, /* These happen to match the return codes of CMP() */
3084 INTENTION_SHRINK
= -1,
3086 } intention
= INTENTION_DONT_KNOW
;
3089 assert(user_record_storage(h
) == USER_LUKS
);
3092 r
= dlopen_cryptsetup();
3096 assert_se(ipo
= user_record_image_path(h
));
3097 ip
= strdupa_safe(ipo
); /* copy out since original might change later in home record object */
3099 if (setup
->image_fd
< 0) {
3100 setup
->image_fd
= open_image_file(h
, NULL
, &st
);
3101 if (setup
->image_fd
< 0)
3102 return setup
->image_fd
;
3104 if (fstat(setup
->image_fd
, &st
) < 0)
3105 return log_error_errno(errno
, "Failed to stat image file %s: %m", ip
);
3108 image_fd
= setup
->image_fd
;
3110 if (S_ISBLK(st
.st_mode
)) {
3113 r
= block_get_whole_disk(st
.st_rdev
, &parent
);
3115 return log_error_errno(r
, "Failed to acquire whole block device for %s: %m", ip
);
3117 /* If we shall resize a file system on a partition device, then let's figure out the
3118 * whole disk device and operate on that instead, since we need to rewrite the
3119 * partition table to resize the partition. */
3121 log_info("Operating on partition device %s, using parent device.", ip
);
3123 r
= device_path_make_major_minor(st
.st_mode
, parent
, &whole_disk
);
3125 return log_error_errno(r
, "Failed to derive whole disk path for %s: %m", ip
);
3127 opened_image_fd
= open(whole_disk
, O_RDWR
|O_CLOEXEC
|O_NOCTTY
|O_NONBLOCK
);
3128 if (opened_image_fd
< 0)
3129 return log_error_errno(errno
, "Failed to open whole block device %s: %m", whole_disk
);
3131 image_fd
= opened_image_fd
;
3133 if (fstat(image_fd
, &st
) < 0)
3134 return log_error_errno(errno
, "Failed to stat whole block device %s: %m", whole_disk
);
3135 if (!S_ISBLK(st
.st_mode
))
3136 return log_error_errno(SYNTHETIC_ERRNO(ENOTBLK
), "Whole block device %s is not actually a block device, refusing.", whole_disk
);
3138 log_info("Operating on whole block device %s.", ip
);
3140 if (ioctl(image_fd
, BLKGETSIZE64
, &old_image_size
) < 0)
3141 return log_error_errno(errno
, "Failed to determine size of original block device: %m");
3143 if (flock(image_fd
, LOCK_EX
) < 0) /* make sure udev doesn't read from it while we operate on the device */
3144 return log_error_errno(errno
, "Failed to lock block device %s: %m", ip
);
3146 new_image_size
= old_image_size
; /* we can't resize physical block devices */
3148 r
= stat_verify_regular(&st
);
3150 return log_error_errno(r
, "Image %s is not a block device nor regular file: %m", ip
);
3152 old_image_size
= st
.st_size
;
3154 /* Note an asymetry here: when we operate on loopback files the specified disk size we get we
3155 * apply onto the loopback file as a whole. When we operate on block devices we instead apply
3156 * to the partition itself only. */
3158 if (FLAGS_SET(flags
, HOME_SETUP_RESIZE_MINIMIZE
)) {
3160 intention
= INTENTION_SHRINK
;
3162 uint64_t new_image_size_rounded
;
3164 new_image_size_rounded
= DISK_SIZE_ROUND_DOWN(h
->disk_size
);
3166 if (old_image_size
>= new_image_size_rounded
&& old_image_size
<= h
->disk_size
) {
3167 /* If exact match, or a match after we rounded down, don't do a thing */
3168 log_info("Image size already matching, skipping operation.");
3172 new_image_size
= new_image_size_rounded
;
3173 intention
= CMP(new_image_size
, old_image_size
); /* Is this a shrink */
3177 r
= home_setup_luks(
3183 FLAGS_SET(flags
, HOME_SETUP_RESIZE_DONT_SYNC_IDENTITIES
) ? NULL
: &header_home
);
3187 if (!FLAGS_SET(flags
, HOME_SETUP_RESIZE_DONT_SYNC_IDENTITIES
)) {
3188 r
= home_load_embedded_identity(h
, setup
->root_fd
, header_home
, USER_RECONCILE_REQUIRE_NEWER_OR_EQUAL
, cache
, &embedded_home
, &new_home
);
3193 r
= home_maybe_shift_uid(h
, flags
, setup
);
3197 log_info("offset = %" PRIu64
", size = %" PRIu64
", image = %" PRIu64
, setup
->partition_offset
, setup
->partition_size
, old_image_size
);
3199 if ((UINT64_MAX
- setup
->partition_offset
) < setup
->partition_size
||
3200 setup
->partition_offset
+ setup
->partition_size
> old_image_size
)
3201 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Old partition doesn't fit in backing storage, refusing.");
3203 if (S_ISREG(st
.st_mode
)) {
3204 uint64_t partition_table_extra
, largest_size
;
3206 partition_table_extra
= old_image_size
- setup
->partition_size
;
3208 r
= get_largest_image_size(setup
->image_fd
, &st
, &largest_size
);
3211 if (new_image_size
> largest_size
)
3212 new_image_size
= largest_size
;
3214 if (new_image_size
< partition_table_extra
)
3215 new_image_size
= partition_table_extra
;
3217 new_partition_size
= DISK_SIZE_ROUND_DOWN(new_image_size
- partition_table_extra
);
3219 assert(S_ISBLK(st
.st_mode
));
3221 if (FLAGS_SET(flags
, HOME_SETUP_RESIZE_MINIMIZE
)) {
3222 new_partition_size
= 0;
3223 intention
= INTENTION_SHRINK
;
3225 uint64_t new_partition_size_rounded
;
3227 new_partition_size_rounded
= DISK_SIZE_ROUND_DOWN(h
->disk_size
);
3229 if (setup
->partition_size
>= new_partition_size_rounded
&&
3230 setup
->partition_size
<= h
->disk_size
) {
3231 log_info("Partition size already matching, skipping operation.");
3235 new_partition_size
= new_partition_size_rounded
;
3236 intention
= CMP(new_partition_size
, setup
->partition_size
);
3240 if ((UINT64_MAX
- setup
->partition_offset
) < new_partition_size
||
3241 setup
->partition_offset
+ new_partition_size
> new_image_size
)
3242 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "New partition doesn't fit into backing storage, refusing.");
3244 crypto_offset
= sym_crypt_get_data_offset(setup
->crypt_device
);
3245 if (crypto_offset
> UINT64_MAX
/512U)
3246 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "LUKS2 data offset out of range, refusing.");
3247 crypto_offset_bytes
= (uint64_t) crypto_offset
* 512U;
3248 if (setup
->partition_size
<= crypto_offset_bytes
)
3249 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Weird, old crypto payload offset doesn't actually fit in partition size?");
3251 /* Make sure at least the LUKS header fit in */
3252 if (new_partition_size
<= crypto_offset_bytes
) {
3255 add
= DISK_SIZE_ROUND_UP(crypto_offset_bytes
) - new_partition_size
;
3256 new_partition_size
+= add
;
3257 if (S_ISREG(st
.st_mode
))
3258 new_image_size
+= add
;
3261 old_fs_size
= setup
->partition_size
- crypto_offset_bytes
;
3262 new_fs_size
= DISK_SIZE_ROUND_DOWN(new_partition_size
- crypto_offset_bytes
);
3264 r
= get_smallest_fs_size(setup
->root_fd
, &smallest_fs_size
);
3268 if (new_fs_size
< smallest_fs_size
) {
3271 add
= DISK_SIZE_ROUND_UP(smallest_fs_size
) - new_fs_size
;
3273 new_partition_size
+= add
;
3274 if (S_ISREG(st
.st_mode
))
3275 new_image_size
+= add
;
3278 if (new_fs_size
== old_fs_size
) {
3279 log_info("New file system size identical to old file system size, skipping operation.");
3283 if (FLAGS_SET(flags
, HOME_SETUP_RESIZE_DONT_GROW
) && new_fs_size
> old_fs_size
) {
3284 log_info("New file system size would be larger than old, but shrinking requested, skipping operation.");
3288 if (FLAGS_SET(flags
, HOME_SETUP_RESIZE_DONT_SHRINK
) && new_fs_size
< old_fs_size
) {
3289 log_info("New file system size would be smaller than old, but growing requested, skipping operation.");
3293 if (CMP(new_fs_size
, old_fs_size
) != intention
) {
3295 log_info("Shrink operation would enlarge file system, skipping operation.");
3297 assert(intention
> 0);
3298 log_info("Grow operation would shrink file system, skipping operation.");
3303 /* Before we start doing anything, let's figure out if we actually can */
3304 resize_type
= can_resize_fs(setup
->root_fd
, old_fs_size
, new_fs_size
);
3305 if (resize_type
< 0)
3307 if (resize_type
== CAN_RESIZE_OFFLINE
&& FLAGS_SET(flags
, HOME_SETUP_ALREADY_ACTIVATED
))
3308 return log_error_errno(SYNTHETIC_ERRNO(ETXTBSY
), "File systems of this type can only be resized offline, but is currently online.");
3310 log_info("Ready to resize image size %s → %s, partition size %s → %s, file system size %s → %s.",
3311 FORMAT_BYTES(old_image_size
),
3312 FORMAT_BYTES(new_image_size
),
3313 FORMAT_BYTES(setup
->partition_size
),
3314 FORMAT_BYTES(new_partition_size
),
3315 FORMAT_BYTES(old_fs_size
),
3316 FORMAT_BYTES(new_fs_size
));
3318 r
= prepare_resize_partition(
3320 setup
->partition_offset
,
3321 setup
->partition_size
,
3328 if (new_fs_size
> old_fs_size
) { /* → Grow */
3330 if (S_ISREG(st
.st_mode
)) {
3331 uint64_t resized_image_size
;
3333 /* Grow file size */
3334 r
= resize_image_loop(h
, setup
, old_image_size
, new_image_size
, &resized_image_size
);
3338 if (resized_image_size
== old_image_size
) {
3339 log_info("Couldn't change image size.");
3343 assert(resized_image_size
> old_image_size
);
3345 log_info("Growing of image file from %s to %s completed.", FORMAT_BYTES(old_image_size
), FORMAT_BYTES(resized_image_size
));
3347 if (resized_image_size
< new_image_size
) {
3350 /* If the growing we managed to do is smaller than what we wanted we need to
3351 * adjust the partition/file system sizes we are going for, too */
3352 sub
= new_image_size
- resized_image_size
;
3353 assert(new_partition_size
>= sub
);
3354 new_partition_size
-= sub
;
3355 assert(new_fs_size
>= sub
);
3359 new_image_size
= resized_image_size
;
3361 assert(S_ISBLK(st
.st_mode
));
3362 assert(new_image_size
== old_image_size
);
3365 /* Make sure loopback device sees the new bigger size */
3366 r
= loop_device_refresh_size(setup
->loop
, UINT64_MAX
, new_partition_size
);
3368 log_debug_errno(r
, "Device is not a loopback device, not refreshing size.");
3370 return log_error_errno(r
, "Failed to refresh loopback device size: %m");
3372 log_info("Refreshing loop device size completed.");
3374 r
= apply_resize_partition(image_fd
, disk_uuid
, table
, partition
, new_partition_size
);
3378 log_info("Growing of partition completed.");
3380 if (S_ISBLK(st
.st_mode
) && ioctl(image_fd
, BLKRRPART
, 0) < 0)
3381 log_debug_errno(errno
, "BLKRRPART failed on block device, ignoring: %m");
3383 /* Tell LUKS about the new bigger size too */
3384 r
= sym_crypt_resize(setup
->crypt_device
, setup
->dm_name
, new_fs_size
/ 512U);
3386 return log_error_errno(r
, "Failed to grow LUKS device: %m");
3388 log_info("LUKS device growing completed.");
3392 if (!FLAGS_SET(flags
, HOME_SETUP_RESIZE_DONT_SYNC_IDENTITIES
)) {
3393 r
= home_store_embedded_identity(new_home
, setup
->root_fd
, h
->uid
, embedded_home
);
3398 if (S_ISREG(st
.st_mode
)) {
3399 if (user_record_luks_discard(h
))
3400 /* Before we shrink, let's trim the file system, so that we need less space on disk during the shrinking */
3401 (void) run_fitrim(setup
->root_fd
);
3403 /* If discard is off, let's ensure all backing blocks are allocated, so that our resize operation doesn't fail half-way */
3404 r
= run_fallocate(image_fd
, &st
);
3411 /* Now try to resize the file system. The requested size might not always be possible, in which case
3412 * we'll try to get as close as we can get. The result is returned in 'resized_fs_size' */
3413 r
= resize_fs_loop(h
, setup
, resize_type
, old_fs_size
, new_fs_size
, &resized_fs_size
);
3417 if (resized_fs_size
== old_fs_size
) {
3418 log_info("Couldn't change file system size.");
3422 log_info("File system resizing from %s to %s completed.", FORMAT_BYTES(old_fs_size
), FORMAT_BYTES(resized_fs_size
));
3424 if (resized_fs_size
> new_fs_size
) {
3427 /* If the shrinking we managed to do is larger than what we wanted we need to adjust the partition/image sizes. */
3428 add
= resized_fs_size
- new_fs_size
;
3429 new_partition_size
+= add
;
3430 if (S_ISREG(st
.st_mode
))
3431 new_image_size
+= add
;
3434 new_fs_size
= resized_fs_size
;
3436 /* Immediately sync afterwards */
3437 r
= home_sync_and_statfs(setup
->root_fd
, NULL
);
3441 if (new_fs_size
< old_fs_size
) { /* → Shrink */
3443 /* Shrink the LUKS device now, matching the new file system size */
3444 r
= sym_crypt_resize(setup
->crypt_device
, setup
->dm_name
, new_fs_size
/ 512);
3446 return log_error_errno(r
, "Failed to shrink LUKS device: %m");
3448 log_info("LUKS device shrinking completed.");
3450 /* Refresh the loop devices size */
3451 r
= loop_device_refresh_size(setup
->loop
, UINT64_MAX
, new_partition_size
);
3453 log_debug_errno(r
, "Device is not a loopback device, not refreshing size.");
3455 return log_error_errno(r
, "Failed to refresh loopback device size: %m");
3457 log_info("Refreshing loop device size completed.");
3459 if (S_ISREG(st
.st_mode
)) {
3460 /* Shrink the image file */
3461 if (ftruncate(image_fd
, new_image_size
) < 0)
3462 return log_error_errno(errno
, "Failed to shrink image file %s: %m", ip
);
3464 log_info("Shrinking of image file completed.");
3466 assert(S_ISBLK(st
.st_mode
));
3467 assert(new_image_size
== old_image_size
);
3470 r
= apply_resize_partition(image_fd
, disk_uuid
, table
, partition
, new_partition_size
);
3474 log_info("Shrinking of partition completed.");
3476 if (S_ISBLK(st
.st_mode
) && ioctl(image_fd
, BLKRRPART
, 0) < 0)
3477 log_debug_errno(errno
, "BLKRRPART failed on block device, ignoring: %m");
3479 } else { /* → Grow */
3480 if (!FLAGS_SET(flags
, HOME_SETUP_RESIZE_DONT_SYNC_IDENTITIES
)) {
3481 r
= home_store_embedded_identity(new_home
, setup
->root_fd
, h
->uid
, embedded_home
);
3487 if (!FLAGS_SET(flags
, HOME_SETUP_RESIZE_DONT_SYNC_IDENTITIES
)) {
3488 r
= home_store_header_identity_luks(new_home
, setup
, header_home
);
3492 r
= home_extend_embedded_identity(new_home
, h
, setup
);
3497 if (user_record_luks_discard(h
))
3498 (void) run_fitrim(setup
->root_fd
);
3500 r
= home_sync_and_statfs(setup
->root_fd
, &sfs
);
3504 if (!FLAGS_SET(flags
, HOME_SETUP_RESIZE_DONT_UNDO
)) {
3505 r
= home_setup_done(setup
);
3510 log_info("Resizing completed.");
3512 print_size_summary(new_image_size
, new_fs_size
, &sfs
);
3515 *ret_home
= TAKE_PTR(new_home
);
3520 int home_passwd_luks(
3522 HomeSetupFlags flags
,
3524 const PasswordCache
*cache
, /* the passwords acquired via PKCS#11/FIDO2 security tokens */
3525 char **effective_passwords
/* new passwords */) {
3527 size_t volume_key_size
, max_key_slots
, n_effective
;
3528 _cleanup_(erase_and_freep
) void *volume_key
= NULL
;
3529 struct crypt_pbkdf_type good_pbkdf
, minimal_pbkdf
;
3535 assert(user_record_storage(h
) == USER_LUKS
);
3538 r
= dlopen_cryptsetup();
3542 type
= sym_crypt_get_type(setup
->crypt_device
);
3544 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine crypto device type.");
3546 r
= sym_crypt_keyslot_max(type
);
3548 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine number of key slots.");
3551 r
= sym_crypt_get_volume_key_size(setup
->crypt_device
);
3553 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine volume key size.");
3554 volume_key_size
= (size_t) r
;
3556 volume_key
= malloc(volume_key_size
);
3561 FOREACH_POINTER(list
,
3562 cache
? cache
->keyring_passswords
: NULL
,
3563 cache
? cache
->pkcs11_passwords
: NULL
,
3564 cache
? cache
->fido2_passwords
: NULL
,
3567 r
= luks_try_passwords(h
, setup
->crypt_device
, list
, volume_key
, &volume_key_size
, NULL
);
3572 return log_error_errno(SYNTHETIC_ERRNO(ENOKEY
), "Failed to unlock LUKS superblock with supplied passwords.");
3574 return log_error_errno(r
, "Failed to unlocks LUKS superblock: %m");
3576 n_effective
= strv_length(effective_passwords
);
3578 build_good_pbkdf(&good_pbkdf
, h
);
3579 build_minimal_pbkdf(&minimal_pbkdf
, h
);
3581 for (size_t i
= 0; i
< max_key_slots
; i
++) {
3582 r
= sym_crypt_keyslot_destroy(setup
->crypt_device
, i
);
3583 if (r
< 0 && !IN_SET(r
, -ENOENT
, -EINVAL
)) /* Returns EINVAL or ENOENT if there's no key in this slot already */
3584 return log_error_errno(r
, "Failed to destroy LUKS password: %m");
3586 if (i
>= n_effective
) {
3588 log_info("Destroyed LUKS key slot %zu.", i
);
3592 if (password_cache_contains(cache
, effective_passwords
[i
])) { /* Is this a FIDO2 or PKCS#11 password? */
3593 log_debug("Using minimal PBKDF for slot %zu", i
);
3594 r
= sym_crypt_set_pbkdf_type(setup
->crypt_device
, &minimal_pbkdf
);
3596 log_debug("Using good PBKDF for slot %zu", i
);
3597 r
= sym_crypt_set_pbkdf_type(setup
->crypt_device
, &good_pbkdf
);
3600 return log_error_errno(r
, "Failed to tweak PBKDF for slot %zu: %m", i
);
3602 r
= sym_crypt_keyslot_add_by_volume_key(
3603 setup
->crypt_device
,
3607 effective_passwords
[i
],
3608 strlen(effective_passwords
[i
]));
3610 return log_error_errno(r
, "Failed to set up LUKS password: %m");
3612 log_info("Updated LUKS key slot %zu.", i
);
3614 /* If we changed the password, then make sure to update the copy in the keyring, so that
3615 * auto-rebalance continues to work. We only do this if we operate on an active home dir. */
3616 if (i
== 0 && FLAGS_SET(flags
, HOME_SETUP_ALREADY_ACTIVATED
))
3617 upload_to_keyring(h
, effective_passwords
[i
], NULL
);
3623 int home_lock_luks(UserRecord
*h
, HomeSetup
*setup
) {
3629 assert(setup
->root_fd
< 0);
3630 assert(!setup
->crypt_device
);
3632 r
= acquire_open_luks_device(h
, setup
, /* graceful= */ false);
3636 log_info("Discovered used LUKS device %s.", setup
->dm_node
);
3638 assert_se(p
= user_record_home_directory(h
));
3639 r
= syncfs_path(AT_FDCWD
, p
);
3640 if (r
< 0) /* Snake oil, but let's better be safe than sorry */
3641 return log_error_errno(r
, "Failed to synchronize file system %s: %m", p
);
3643 log_info("File system synchronized.");
3645 /* Note that we don't invoke FIFREEZE here, it appears libcryptsetup/device-mapper already does that on its own for us */
3647 r
= sym_crypt_suspend(setup
->crypt_device
, setup
->dm_name
);
3649 return log_error_errno(r
, "Failed to suspend cryptsetup device: %s: %m", setup
->dm_node
);
3651 log_info("LUKS device suspended.");
3655 static int luks_try_resume(
3656 struct crypt_device
*cd
,
3657 const char *dm_name
,
3665 STRV_FOREACH(pp
, password
) {
3666 r
= sym_crypt_resume_by_passphrase(
3673 log_info("Resumed LUKS device %s.", dm_name
);
3677 log_debug_errno(r
, "Password %zu didn't work for resuming device: %m", (size_t) (pp
- password
));
3683 int home_unlock_luks(UserRecord
*h
, HomeSetup
*setup
, const PasswordCache
*cache
) {
3689 assert(!setup
->crypt_device
);
3691 r
= acquire_open_luks_device(h
, setup
, /* graceful= */ false);
3695 log_info("Discovered used LUKS device %s.", setup
->dm_node
);
3698 FOREACH_POINTER(list
,
3699 cache
? cache
->pkcs11_passwords
: NULL
,
3700 cache
? cache
->fido2_passwords
: NULL
,
3702 r
= luks_try_resume(setup
->crypt_device
, setup
->dm_name
, list
);
3707 return log_error_errno(r
, "No valid password for LUKS superblock.");
3709 return log_error_errno(r
, "Failed to resume LUKS superblock: %m");
3711 log_info("LUKS device resumed.");
3715 static int device_is_gone(HomeSetup
*setup
) {
3716 _cleanup_(sd_device_unrefp
) sd_device
*d
= NULL
;
3722 if (!setup
->dm_node
)
3725 if (stat(setup
->dm_node
, &st
) < 0) {
3726 if (errno
!= ENOENT
)
3727 return log_error_errno(errno
, "Failed to stat block device node %s: %m", setup
->dm_node
);
3732 r
= sd_device_new_from_stat_rdev(&d
, &st
);
3735 return log_error_errno(errno
, "Failed to allocate device object from block device node %s: %m", setup
->dm_node
);
3743 static int device_monitor_handler(sd_device_monitor
*monitor
, sd_device
*device
, void *userdata
) {
3744 HomeSetup
*setup
= userdata
;
3749 if (!device_for_action(device
, SD_DEVICE_REMOVE
))
3752 /* We don't really care for the device object passed to us, we just check if the device node still
3755 r
= device_is_gone(setup
);
3758 if (r
> 0) /* Yay! we are done! */
3759 (void) sd_event_exit(sd_device_monitor_get_event(monitor
), 0);
3764 int wait_for_block_device_gone(HomeSetup
*setup
, usec_t timeout_usec
) {
3765 _cleanup_(sd_device_monitor_unrefp
) sd_device_monitor
*m
= NULL
;
3766 _cleanup_(sd_event_unrefp
) sd_event
*event
= NULL
;
3771 /* So here's the thing: we enable "deferred deactivation" on our dm-crypt volumes. This means they
3772 * are automatically torn down once not used anymore (i.e. once unmounted). Which is great. It also
3773 * means that when we deactivate a home directory and try to tear down the volume that backs it, it
3774 * possibly is already torn down or in the process of being torn down, since we race against the
3775 * automatic tearing down. Which is fine, we handle errors from that. However, we lose the ability to
3776 * naturally wait for the tear down operation to complete: if we are not the ones who tear down the
3777 * device we are also not the ones who naturally block on that operation. Hence let's add some code
3778 * to actively wait for the device to go away, via sd-device. We'll call this whenever tearing down a
3779 * LUKS device, to ensure the device is really really gone before we proceed. Net effect: "homectl
3780 * deactivate foo && homectl activate foo" will work reliably, i.e. deactivation immediately followed
3781 * by activation will work. Also, by the time deactivation completes we can guarantee that all data
3782 * is sync'ed down to the lowest block layer as all higher levels are fully and entirely
3785 if (!setup
->dm_name
)
3788 assert(setup
->dm_node
);
3789 log_debug("Waiting until %s disappears.", setup
->dm_node
);
3791 r
= sd_event_new(&event
);
3793 return log_error_errno(r
, "Failed to allocate event loop: %m");
3795 r
= sd_device_monitor_new(&m
);
3797 return log_error_errno(r
, "Failed to allocate device monitor: %m");
3799 r
= sd_device_monitor_filter_add_match_subsystem_devtype(m
, "block", "disk");
3801 return log_error_errno(r
, "Failed to configure device monitor match: %m");
3803 r
= sd_device_monitor_attach_event(m
, event
);
3805 return log_error_errno(r
, "Failed to attach device monitor to event loop: %m");
3807 r
= sd_device_monitor_start(m
, device_monitor_handler
, setup
);
3809 return log_error_errno(r
, "Failed to start device monitor: %m");
3811 r
= device_is_gone(setup
);
3815 log_debug("%s has already disappeared before entering wait loop.", setup
->dm_node
);
3816 return 0; /* gone already */
3819 if (timeout_usec
!= USEC_INFINITY
) {
3820 r
= sd_event_add_time_relative(event
, NULL
, CLOCK_MONOTONIC
, timeout_usec
, 0, NULL
, NULL
);
3822 return log_error_errno(r
, "Failed to add timer event: %m");
3825 r
= sd_event_loop(event
);
3827 return log_error_errno(r
, "Failed to run event loop: %m");
3829 r
= device_is_gone(setup
);
3833 return log_error_errno(r
, "Device %s still around.", setup
->dm_node
);
3835 log_debug("Successfully waited until device %s disappeared.", setup
->dm_node
);
3839 int home_auto_shrink_luks(UserRecord
*h
, HomeSetup
*setup
, PasswordCache
*cache
) {
3844 assert(user_record_storage(h
) == USER_LUKS
);
3846 assert(setup
->root_fd
>= 0);
3848 if (user_record_auto_resize_mode(h
) != AUTO_RESIZE_SHRINK_AND_GROW
)
3851 if (fstatfs(setup
->root_fd
, &sfs
) < 0)
3852 return log_error_errno(errno
, "Failed to statfs home directory: %m");
3854 if (!fs_can_online_shrink_and_grow(sfs
.f_type
)) {
3855 log_debug("Not auto-shrinking file system, since selected file system cannot do both online shrink and grow.");
3859 r
= home_resize_luks(
3861 HOME_SETUP_ALREADY_ACTIVATED
|
3862 HOME_SETUP_RESIZE_DONT_SYNC_IDENTITIES
|
3863 HOME_SETUP_RESIZE_MINIMIZE
|
3864 HOME_SETUP_RESIZE_DONT_GROW
|
3865 HOME_SETUP_RESIZE_DONT_UNDO
,