1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
4 #include <linux/loop.h>
11 #include "blkid-util.h"
12 #include "blockdev-util.h"
13 #include "btrfs-util.h"
14 #include "chattr-util.h"
16 #include "errno-util.h"
20 #include "fsck-util.h"
21 #include "home-util.h"
22 #include "homework-luks.h"
23 #include "homework-mount.h"
24 #include "id128-util.h"
26 #include "memory-util.h"
27 #include "missing_magic.h"
29 #include "mkfs-util.h"
30 #include "mount-util.h"
31 #include "openssl-util.h"
32 #include "parse-util.h"
33 #include "path-util.h"
34 #include "process-util.h"
35 #include "random-util.h"
36 #include "resize-fs.h"
37 #include "stat-util.h"
39 #include "tmpfile-util.h"
41 /* Round down to the nearest 1K size. Note that Linux generally handles block devices with 512 blocks only,
42 * but actually doesn't accept uneven numbers in many cases. To avoid any confusion around this we'll
43 * strictly round disk sizes down to the next 1K boundary.*/
44 #define DISK_SIZE_ROUND_DOWN(x) ((x) & ~UINT64_C(1023))
46 int run_mark_dirty(int fd
, bool b
) {
50 /* Sets or removes the 'user.home-dirty' xattr on the specified file. We use this to detect when a
51 * home directory was not properly unmounted. */
55 r
= fd_verify_regular(fd
);
60 ret
= fsetxattr(fd
, "user.home-dirty", &x
, 1, XATTR_CREATE
);
61 if (ret
< 0 && errno
!= EEXIST
)
62 return log_debug_errno(errno
, "Could not mark home directory as dirty: %m");
67 return log_debug_errno(r
, "Failed to synchronize image before marking it clean: %m");
69 ret
= fremovexattr(fd
, "user.home-dirty");
70 if (ret
< 0 && errno
!= ENODATA
)
71 return log_debug_errno(errno
, "Could not mark home directory as clean: %m");
76 return log_debug_errno(r
, "Failed to synchronize dirty flag to disk: %m");
81 int run_mark_dirty_by_path(const char *path
, bool b
) {
82 _cleanup_close_
int fd
= -1;
86 fd
= open(path
, O_RDWR
|O_CLOEXEC
|O_NOCTTY
);
88 return log_debug_errno(errno
, "Failed to open %s to mark dirty or clean: %m", path
);
90 return run_mark_dirty(fd
, b
);
93 static int probe_file_system_by_fd(
96 sd_id128_t
*ret_uuid
) {
98 _cleanup_(blkid_free_probep
) blkid_probe b
= NULL
;
99 _cleanup_free_
char *s
= NULL
;
100 const char *fstype
= NULL
, *uuid
= NULL
;
108 b
= blkid_new_probe();
113 r
= blkid_probe_set_device(b
, fd
, 0, 0);
115 return errno
> 0 ? -errno
: -ENOMEM
;
117 (void) blkid_probe_enable_superblocks(b
, 1);
118 (void) blkid_probe_set_superblocks_flags(b
, BLKID_SUBLKS_TYPE
|BLKID_SUBLKS_UUID
);
121 r
= blkid_do_safeprobe(b
);
122 if (IN_SET(r
, -2, 1)) /* nothing found or ambiguous result */
125 return errno
> 0 ? -errno
: -EIO
;
127 (void) blkid_probe_lookup_value(b
, "TYPE", &fstype
, NULL
);
131 (void) blkid_probe_lookup_value(b
, "UUID", &uuid
, NULL
);
135 r
= sd_id128_from_string(uuid
, &id
);
143 *ret_fstype
= TAKE_PTR(s
);
149 static int probe_file_system_by_path(const char *path
, char **ret_fstype
, sd_id128_t
*ret_uuid
) {
150 _cleanup_close_
int fd
= -1;
152 fd
= open(path
, O_RDONLY
|O_CLOEXEC
|O_NOCTTY
|O_NONBLOCK
);
156 return probe_file_system_by_fd(fd
, ret_fstype
, ret_uuid
);
159 static int block_get_size_by_fd(int fd
, uint64_t *ret
) {
165 if (fstat(fd
, &st
) < 0)
168 if (!S_ISBLK(st
.st_mode
))
171 if (ioctl(fd
, BLKGETSIZE64
, ret
) < 0)
177 static int block_get_size_by_path(const char *path
, uint64_t *ret
) {
178 _cleanup_close_
int fd
= -1;
180 fd
= open(path
, O_RDONLY
|O_CLOEXEC
|O_NOCTTY
|O_NONBLOCK
);
184 return block_get_size_by_fd(fd
, ret
);
187 static int run_fsck(const char *node
, const char *fstype
) {
194 r
= fsck_exists(fstype
);
196 return log_error_errno(r
, "Failed to check if fsck for file system %s exists: %m", fstype
);
198 log_warning("No fsck for file system %s installed, ignoring.", fstype
);
202 r
= safe_fork("(fsck)",
203 FORK_RESET_SIGNALS
|FORK_RLIMIT_NOFILE_SAFE
|FORK_DEATHSIG
|FORK_LOG
|FORK_STDOUT_TO_STDERR
|FORK_CLOSE_ALL_FDS
,
209 execl("/sbin/fsck", "/sbin/fsck", "-aTl", node
, NULL
);
211 log_error_errno(errno
, "Failed to execute fsck: %m");
212 _exit(FSCK_OPERATIONAL_ERROR
);
215 exit_status
= wait_for_terminate_and_check("fsck", fsck_pid
, WAIT_LOG_ABNORMAL
);
218 if ((exit_status
& ~FSCK_ERROR_CORRECTED
) != 0) {
219 log_warning("fsck failed with exit status %i.", exit_status
);
221 if ((exit_status
& (FSCK_SYSTEM_SHOULD_REBOOT
|FSCK_ERRORS_LEFT_UNCORRECTED
)) != 0)
222 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "File system is corrupted, refusing.");
224 log_warning("Ignoring fsck error.");
227 log_info("File system check completed.");
232 static int luks_try_passwords(
233 struct crypt_device
*cd
,
236 size_t *volume_key_size
) {
243 STRV_FOREACH(pp
, passwords
) {
244 size_t vks
= *volume_key_size
;
246 r
= crypt_volume_key_get(
254 *volume_key_size
= vks
;
258 log_debug_errno(r
, "Password %zu didn't work for unlocking LUKS superblock: %m", (size_t) (pp
- passwords
));
264 static int luks_setup(
269 const char *cipher_mode
,
270 uint64_t volume_key_size
,
272 const PasswordCache
*cache
,
274 struct crypt_device
**ret
,
275 sd_id128_t
*ret_found_uuid
,
276 void **ret_volume_key
,
277 size_t *ret_volume_key_size
) {
279 _cleanup_(crypt_freep
) struct crypt_device
*cd
= NULL
;
280 _cleanup_(erase_and_freep
) void *vk
= NULL
;
290 r
= crypt_init(&cd
, node
);
292 return log_error_errno(r
, "Failed to allocate libcryptsetup context: %m");
294 cryptsetup_enable_logging(cd
);
296 r
= crypt_load(cd
, CRYPT_LUKS2
, NULL
);
298 return log_error_errno(r
, "Failed to load LUKS superblock: %m");
300 r
= crypt_get_volume_key_size(cd
);
302 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine LUKS volume key size");
305 if (!sd_id128_is_null(uuid
) || ret_found_uuid
) {
308 s
= crypt_get_uuid(cd
);
310 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock has no UUID.");
312 r
= sd_id128_from_string(s
, &p
);
314 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock has invalid UUID.");
316 /* Check that the UUID matches, if specified */
317 if (!sd_id128_is_null(uuid
) &&
318 !sd_id128_equal(uuid
, p
))
319 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock has wrong UUID.");
322 if (cipher
&& !streq_ptr(cipher
, crypt_get_cipher(cd
)))
323 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock declares wrong cipher.");
325 if (cipher_mode
&& !streq_ptr(cipher_mode
, crypt_get_cipher_mode(cd
)))
326 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock declares wrong cipher mode.");
328 if (volume_key_size
!= UINT64_MAX
&& vks
!= volume_key_size
)
329 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock declares wrong volume key size.");
336 FOREACH_POINTER(list
, cache
->pkcs11_passwords
, cache
->fido2_passwords
, passwords
) {
337 r
= luks_try_passwords(cd
, list
, vk
, &vks
);
342 return log_error_errno(r
, "No valid password for LUKS superblock.");
344 return log_error_errno(r
, "Failed to unlocks LUKS superblock: %m");
346 r
= crypt_activate_by_volume_key(
350 discard
? CRYPT_ACTIVATE_ALLOW_DISCARDS
: 0);
352 return log_error_errno(r
, "Failed to unlock LUKS superblock: %m");
354 log_info("Setting up LUKS device /dev/mapper/%s completed.", dm_name
);
358 if (ret_found_uuid
) /* Return the UUID actually found if the caller wants to know */
361 *ret_volume_key
= TAKE_PTR(vk
);
362 if (ret_volume_key_size
)
363 *ret_volume_key_size
= vks
;
368 static int luks_open(
371 PasswordCache
*cache
,
372 struct crypt_device
**ret
,
373 sd_id128_t
*ret_found_uuid
,
374 void **ret_volume_key
,
375 size_t *ret_volume_key_size
) {
377 _cleanup_(crypt_freep
) struct crypt_device
*cd
= NULL
;
378 _cleanup_(erase_and_freep
) void *vk
= NULL
;
387 /* Opens a LUKS device that is already set up. Re-validates the password while doing so (which also
388 * provides us with the volume key, which we want). */
390 r
= crypt_init_by_name(&cd
, dm_name
);
392 return log_error_errno(r
, "Failed to initialize cryptsetup context for %s: %m", dm_name
);
394 cryptsetup_enable_logging(cd
);
396 r
= crypt_load(cd
, CRYPT_LUKS2
, NULL
);
398 return log_error_errno(r
, "Failed to load LUKS superblock: %m");
400 r
= crypt_get_volume_key_size(cd
);
402 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine LUKS volume key size");
405 if (ret_found_uuid
) {
408 s
= crypt_get_uuid(cd
);
410 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock has no UUID.");
412 r
= sd_id128_from_string(s
, &p
);
414 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock has invalid UUID.");
422 FOREACH_POINTER(list
, cache
->pkcs11_passwords
, cache
->fido2_passwords
, passwords
) {
423 r
= luks_try_passwords(cd
, list
, vk
, &vks
);
428 return log_error_errno(r
, "No valid password for LUKS superblock.");
430 return log_error_errno(r
, "Failed to unlocks LUKS superblock: %m");
432 log_info("Discovered used LUKS device /dev/mapper/%s, and validated password.", dm_name
);
434 /* This is needed so that crypt_resize() can operate correctly for pre-existing LUKS devices. We need
435 * to tell libcryptsetup the volume key explicitly, so that it is in the kernel keyring. */
436 r
= crypt_activate_by_volume_key(cd
, NULL
, vk
, vks
, CRYPT_ACTIVATE_KEYRING_KEY
);
438 return log_error_errno(r
, "Failed to upload volume key again: %m");
440 log_info("Successfully re-activated LUKS device.");
447 *ret_volume_key
= TAKE_PTR(vk
);
448 if (ret_volume_key_size
)
449 *ret_volume_key_size
= vks
;
454 static int fs_validate(
458 sd_id128_t
*ret_found_uuid
) {
460 _cleanup_free_
char *fstype
= NULL
;
467 r
= probe_file_system_by_path(dm_node
, &fstype
, &u
);
469 return log_error_errno(r
, "Failed to probe file system: %m");
471 /* Limit the set of supported file systems a bit, as protection against little tested kernel file
472 * systems. Also, we only support the resize ioctls for these file systems. */
473 if (!supported_fstype(fstype
))
474 return log_error_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT
), "Image contains unsupported file system: %s", strna(fstype
));
476 if (!sd_id128_is_null(uuid
) &&
477 !sd_id128_equal(uuid
, u
))
478 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "File system has wrong UUID.");
480 log_info("Probing file system completed (found %s).", fstype
);
482 *ret_fstype
= TAKE_PTR(fstype
);
484 if (ret_found_uuid
) /* Return the UUID actually found if the caller wants to know */
490 static int make_dm_names(const char *user_name
, char **ret_dm_name
, char **ret_dm_node
) {
491 _cleanup_free_
char *name
= NULL
, *node
= NULL
;
497 name
= strjoin("home-", user_name
);
501 node
= path_join("/dev/mapper/", name
);
505 *ret_dm_name
= TAKE_PTR(name
);
506 *ret_dm_node
= TAKE_PTR(node
);
510 static int luks_validate(
513 sd_id128_t partition_uuid
,
514 sd_id128_t
*ret_partition_uuid
,
515 uint64_t *ret_offset
,
516 uint64_t *ret_size
) {
518 _cleanup_(blkid_free_probep
) blkid_probe b
= NULL
;
519 sd_id128_t found_partition_uuid
= SD_ID128_NULL
;
520 const char *fstype
= NULL
, *pttype
= NULL
;
521 blkid_loff_t offset
= 0, size
= 0;
531 b
= blkid_new_probe();
536 r
= blkid_probe_set_device(b
, fd
, 0, 0);
538 return errno
> 0 ? -errno
: -ENOMEM
;
540 (void) blkid_probe_enable_superblocks(b
, 1);
541 (void) blkid_probe_set_superblocks_flags(b
, BLKID_SUBLKS_TYPE
);
542 (void) blkid_probe_enable_partitions(b
, 1);
543 (void) blkid_probe_set_partitions_flags(b
, BLKID_PARTS_ENTRY_DETAILS
);
546 r
= blkid_do_safeprobe(b
);
547 if (IN_SET(r
, -2, 1)) /* nothing found or ambiguous result */
550 return errno
> 0 ? -errno
: -EIO
;
552 (void) blkid_probe_lookup_value(b
, "TYPE", &fstype
, NULL
);
553 if (streq_ptr(fstype
, "crypto_LUKS")) {
554 /* Directly a LUKS image */
556 *ret_size
= UINT64_MAX
; /* full disk */
557 *ret_partition_uuid
= SD_ID128_NULL
;
562 (void) blkid_probe_lookup_value(b
, "PTTYPE", &pttype
, NULL
);
563 if (!streq_ptr(pttype
, "gpt"))
567 pl
= blkid_probe_get_partitions(b
);
569 return errno
> 0 ? -errno
: -ENOMEM
;
572 n
= blkid_partlist_numof_partitions(pl
);
574 return errno
> 0 ? -errno
: -EIO
;
576 for (int i
= 0; i
< n
; i
++) {
578 sd_id128_t id
= SD_ID128_NULL
;
582 pp
= blkid_partlist_get_partition(pl
, i
);
584 return errno
> 0 ? -errno
: -EIO
;
586 if (!streq_ptr(blkid_partition_get_type_string(pp
), "773f91ef-66d4-49b5-bd83-d683bf40ad16"))
589 if (!streq_ptr(blkid_partition_get_name(pp
), label
))
592 sid
= blkid_partition_get_uuid(pp
);
594 r
= sd_id128_from_string(sid
, &id
);
596 log_debug_errno(r
, "Couldn't parse partition UUID %s, weird: %m", sid
);
598 if (!sd_id128_is_null(partition_uuid
) && !sd_id128_equal(id
, partition_uuid
))
605 offset
= blkid_partition_get_start(pp
);
606 size
= blkid_partition_get_size(pp
);
607 found_partition_uuid
= id
;
617 if ((uint64_t) offset
> UINT64_MAX
/ 512U)
621 if ((uint64_t) size
> UINT64_MAX
/ 512U)
624 *ret_offset
= offset
* 512U;
625 *ret_size
= size
* 512U;
626 *ret_partition_uuid
= found_partition_uuid
;
631 static int crypt_device_to_evp_cipher(struct crypt_device
*cd
, const EVP_CIPHER
**ret
) {
632 _cleanup_free_
char *cipher_name
= NULL
;
633 const char *cipher
, *cipher_mode
, *e
;
634 size_t key_size
, key_bits
;
635 const EVP_CIPHER
*cc
;
640 /* Let's find the right OpenSSL EVP_CIPHER object that matches the encryption settings of the LUKS
643 cipher
= crypt_get_cipher(cd
);
645 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Cannot get cipher from LUKS device.");
647 cipher_mode
= crypt_get_cipher_mode(cd
);
649 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Cannot get cipher mode from LUKS device.");
651 e
= strchr(cipher_mode
, '-');
653 cipher_mode
= strndupa(cipher_mode
, e
- cipher_mode
);
655 r
= crypt_get_volume_key_size(cd
);
657 return log_error_errno(r
< 0 ? r
: SYNTHETIC_ERRNO(EINVAL
), "Cannot get volume key size from LUKS device.");
660 key_bits
= key_size
* 8;
661 if (streq(cipher_mode
, "xts"))
664 if (asprintf(&cipher_name
, "%s-%zu-%s", cipher
, key_bits
, cipher_mode
) < 0)
667 cc
= EVP_get_cipherbyname(cipher_name
);
669 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP
), "Selected cipher mode '%s' not supported, can't encrypt JSON record.", cipher_name
);
671 /* Verify that our key length calculations match what OpenSSL thinks */
672 r
= EVP_CIPHER_key_length(cc
);
673 if (r
< 0 || (uint64_t) r
!= key_size
)
674 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Key size of selected cipher doesn't meet our expectations.");
680 static int luks_validate_home_record(
681 struct crypt_device
*cd
,
683 const void *volume_key
,
684 PasswordCache
*cache
,
685 UserRecord
**ret_luks_home_record
) {
692 for (int token
= 0;; token
++) {
693 _cleanup_(json_variant_unrefp
) JsonVariant
*v
= NULL
, *rr
= NULL
;
694 _cleanup_(EVP_CIPHER_CTX_freep
) EVP_CIPHER_CTX
*context
= NULL
;
695 _cleanup_(user_record_unrefp
) UserRecord
*lhr
= NULL
;
696 _cleanup_free_
void *encrypted
= NULL
, *iv
= NULL
;
697 size_t decrypted_size
, encrypted_size
, iv_size
;
698 int decrypted_size_out1
, decrypted_size_out2
;
699 _cleanup_free_
char *decrypted
= NULL
;
700 const char *text
, *type
;
701 crypt_token_info state
;
702 JsonVariant
*jr
, *jiv
;
703 unsigned line
, column
;
704 const EVP_CIPHER
*cc
;
706 state
= crypt_token_status(cd
, token
, &type
);
707 if (state
== CRYPT_TOKEN_INACTIVE
) /* First unconfigured token, give up */
709 if (IN_SET(state
, CRYPT_TOKEN_INTERNAL
, CRYPT_TOKEN_INTERNAL_UNKNOWN
, CRYPT_TOKEN_EXTERNAL
))
711 if (state
!= CRYPT_TOKEN_EXTERNAL_UNKNOWN
)
712 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Unexpected token state of token %i: %i", token
, (int) state
);
714 if (!streq(type
, "systemd-homed"))
717 r
= crypt_token_json_get(cd
, token
, &text
);
719 return log_error_errno(r
, "Failed to read LUKS token %i: %m", token
);
721 r
= json_parse(text
, JSON_PARSE_SENSITIVE
, &v
, &line
, &column
);
723 return log_error_errno(r
, "Failed to parse LUKS token JSON data %u:%u: %m", line
, column
);
725 jr
= json_variant_by_key(v
, "record");
727 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "LUKS token lacks 'record' field.");
728 jiv
= json_variant_by_key(v
, "iv");
730 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "LUKS token lacks 'iv' field.");
732 r
= json_variant_unbase64(jr
, &encrypted
, &encrypted_size
);
734 return log_error_errno(r
, "Failed to base64 decode record: %m");
736 r
= json_variant_unbase64(jiv
, &iv
, &iv_size
);
738 return log_error_errno(r
, "Failed to base64 decode IV: %m");
740 r
= crypt_device_to_evp_cipher(cd
, &cc
);
743 if (iv_size
> INT_MAX
|| EVP_CIPHER_iv_length(cc
) != (int) iv_size
)
744 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "IV size doesn't match.");
746 context
= EVP_CIPHER_CTX_new();
750 if (EVP_DecryptInit_ex(context
, cc
, NULL
, volume_key
, iv
) != 1)
751 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to initialize decryption context.");
753 decrypted_size
= encrypted_size
+ EVP_CIPHER_key_length(cc
) * 2;
754 decrypted
= new(char, decrypted_size
);
758 if (EVP_DecryptUpdate(context
, (uint8_t*) decrypted
, &decrypted_size_out1
, encrypted
, encrypted_size
) != 1)
759 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to decrypt JSON record.");
761 assert((size_t) decrypted_size_out1
<= decrypted_size
);
763 if (EVP_DecryptFinal_ex(context
, (uint8_t*) decrypted
+ decrypted_size_out1
, &decrypted_size_out2
) != 1)
764 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to finish decryption of JSON record.");
766 assert((size_t) decrypted_size_out1
+ (size_t) decrypted_size_out2
< decrypted_size
);
767 decrypted_size
= (size_t) decrypted_size_out1
+ (size_t) decrypted_size_out2
;
769 if (memchr(decrypted
, 0, decrypted_size
))
770 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Inner NUL byte in JSON record, refusing.");
772 decrypted
[decrypted_size
] = 0;
774 r
= json_parse(decrypted
, JSON_PARSE_SENSITIVE
, &rr
, NULL
, NULL
);
776 return log_error_errno(r
, "Failed to parse decrypted JSON record, refusing.");
778 lhr
= user_record_new();
782 r
= user_record_load(lhr
, rr
, USER_RECORD_LOAD_EMBEDDED
|USER_RECORD_PERMISSIVE
);
784 return log_error_errno(r
, "Failed to parse user record: %m");
786 if (!user_record_compatible(h
, lhr
))
787 return log_error_errno(SYNTHETIC_ERRNO(EREMCHG
), "LUKS home record not compatible with host record, refusing.");
789 r
= user_record_authenticate(lhr
, h
, cache
, /* strict_verify= */ true);
792 assert(r
> 0); /* Insist that a password was verified */
794 *ret_luks_home_record
= TAKE_PTR(lhr
);
798 return log_error_errno(SYNTHETIC_ERRNO(EBADMSG
), "Couldn't find home record in LUKS2 header, refusing.");
801 static int format_luks_token_text(
802 struct crypt_device
*cd
,
804 const void *volume_key
,
807 int r
, encrypted_size_out1
= 0, encrypted_size_out2
= 0, iv_size
, key_size
;
808 _cleanup_(EVP_CIPHER_CTX_freep
) EVP_CIPHER_CTX
*context
= NULL
;
809 _cleanup_(json_variant_unrefp
) JsonVariant
*v
= NULL
;
810 _cleanup_free_
void *iv
= NULL
, *encrypted
= NULL
;
811 size_t text_length
, encrypted_size
;
812 _cleanup_free_
char *text
= NULL
;
813 const EVP_CIPHER
*cc
;
820 r
= crypt_device_to_evp_cipher(cd
, &cc
);
824 key_size
= EVP_CIPHER_key_length(cc
);
825 iv_size
= EVP_CIPHER_iv_length(cc
);
828 iv
= malloc(iv_size
);
832 r
= genuine_random_bytes(iv
, iv_size
, RANDOM_BLOCK
);
834 return log_error_errno(r
, "Failed to generate IV: %m");
837 context
= EVP_CIPHER_CTX_new();
841 if (EVP_EncryptInit_ex(context
, cc
, NULL
, volume_key
, iv
) != 1)
842 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to initialize encryption context.");
844 r
= json_variant_format(hr
->json
, 0, &text
);
846 return log_error_errno(r
, "Failed to format user record for LUKS: %m");
848 text_length
= strlen(text
);
849 encrypted_size
= text_length
+ 2*key_size
- 1;
851 encrypted
= malloc(encrypted_size
);
855 if (EVP_EncryptUpdate(context
, encrypted
, &encrypted_size_out1
, (uint8_t*) text
, text_length
) != 1)
856 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to encrypt JSON record.");
858 assert((size_t) encrypted_size_out1
<= encrypted_size
);
860 if (EVP_EncryptFinal_ex(context
, (uint8_t*) encrypted
+ encrypted_size_out1
, &encrypted_size_out2
) != 1)
861 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to finish encryption of JSON record. ");
863 assert((size_t) encrypted_size_out1
+ (size_t) encrypted_size_out2
<= encrypted_size
);
867 JSON_BUILD_PAIR("type", JSON_BUILD_STRING("systemd-homed")),
868 JSON_BUILD_PAIR("keyslots", JSON_BUILD_EMPTY_ARRAY
),
869 JSON_BUILD_PAIR("record", JSON_BUILD_BASE64(encrypted
, encrypted_size_out1
+ encrypted_size_out2
)),
870 JSON_BUILD_PAIR("iv", JSON_BUILD_BASE64(iv
, iv_size
))));
872 return log_error_errno(r
, "Failed to prepare LUKS JSON token object: %m");
874 r
= json_variant_format(v
, 0, ret
);
876 return log_error_errno(r
, "Failed to format encrypted user record for LUKS: %m");
881 int home_store_header_identity_luks(
884 UserRecord
*old_home
) {
886 _cleanup_(user_record_unrefp
) UserRecord
*header_home
= NULL
;
887 _cleanup_free_
char *text
= NULL
;
892 if (!setup
->crypt_device
)
895 assert(setup
->volume_key
);
897 /* Let's store the user's identity record in the LUKS2 "token" header data fields, in an encrypted
898 * fashion. Why that? If we'd rely on the record being embedded in the payload file system itself we
899 * would have to mount the file system before we can validate the JSON record, its signatures and
900 * whether it matches what we are looking for. However, kernel file system implementations are
901 * generally not ready to be used on untrusted media. Hence let's store the record independently of
902 * the file system, so that we can validate it first, and only then mount the file system. To keep
903 * things simple we use the same encryption settings for this record as for the file system itself. */
905 r
= user_record_clone(h
, USER_RECORD_EXTRACT_EMBEDDED
|USER_RECORD_PERMISSIVE
, &header_home
);
907 return log_error_errno(r
, "Failed to determine new header record: %m");
909 if (old_home
&& user_record_equal(old_home
, header_home
)) {
910 log_debug("Not updating header home record.");
914 r
= format_luks_token_text(setup
->crypt_device
, header_home
, setup
->volume_key
, &text
);
919 crypt_token_info state
;
922 state
= crypt_token_status(setup
->crypt_device
, token
, &type
);
923 if (state
== CRYPT_TOKEN_INACTIVE
) /* First unconfigured token, we are done */
925 if (IN_SET(state
, CRYPT_TOKEN_INTERNAL
, CRYPT_TOKEN_INTERNAL_UNKNOWN
, CRYPT_TOKEN_EXTERNAL
))
926 continue; /* Not ours */
927 if (state
!= CRYPT_TOKEN_EXTERNAL_UNKNOWN
)
928 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Unexpected token state of token %i: %i", token
, (int) state
);
930 if (!streq(type
, "systemd-homed"))
933 r
= crypt_token_json_set(setup
->crypt_device
, token
, text
);
935 return log_error_errno(r
, "Failed to set JSON token for slot %i: %m", token
);
937 /* Now, let's free the text so that for all further matching tokens we all crypt_json_token_set()
938 * with a NULL text in order to invalidate the tokens. */
944 return log_error_errno(SYNTHETIC_ERRNO(EBADMSG
), "Didn't find any record token to update.");
946 log_info("Wrote LUKS header user record.");
951 int run_fitrim(int root_fd
) {
952 char buf
[FORMAT_BYTES_MAX
];
953 struct fstrim_range range
= {
957 /* If discarding is on, discard everything right after mounting, so that the discard setting takes
958 * effect on activation. (Also, optionally, trim on logout) */
960 assert(root_fd
>= 0);
962 if (ioctl(root_fd
, FITRIM
, &range
) < 0) {
963 if (ERRNO_IS_NOT_SUPPORTED(errno
) || errno
== EBADF
) {
964 log_debug_errno(errno
, "File system does not support FITRIM, not trimming.");
968 return log_warning_errno(errno
, "Failed to invoke FITRIM, ignoring: %m");
971 log_info("Discarded unused %s.",
972 format_bytes(buf
, sizeof(buf
), range
.len
));
976 int run_fitrim_by_path(const char *root_path
) {
977 _cleanup_close_
int root_fd
= -1;
979 root_fd
= open(root_path
, O_RDONLY
|O_DIRECTORY
|O_CLOEXEC
);
981 return log_error_errno(errno
, "Failed to open file system '%s' for trimming: %m", root_path
);
983 return run_fitrim(root_fd
);
986 int run_fallocate(int backing_fd
, const struct stat
*st
) {
987 char buf
[FORMAT_BYTES_MAX
];
990 assert(backing_fd
>= 0);
992 /* If discarding is off, let's allocate the whole image before mounting, so that the setting takes
993 * effect on activation */
996 if (fstat(backing_fd
, &stbuf
) < 0)
997 return log_error_errno(errno
, "Failed to fstat(): %m");
1002 if (!S_ISREG(st
->st_mode
))
1005 if (st
->st_blocks
>= DIV_ROUND_UP(st
->st_size
, 512)) {
1006 log_info("Backing file is fully allocated already.");
1010 if (fallocate(backing_fd
, FALLOC_FL_KEEP_SIZE
, 0, st
->st_size
) < 0) {
1012 if (ERRNO_IS_NOT_SUPPORTED(errno
)) {
1013 log_debug_errno(errno
, "fallocate() not supported on file system, ignoring.");
1017 if (ERRNO_IS_DISK_SPACE(errno
)) {
1018 log_debug_errno(errno
, "Not enough disk space to fully allocate home.");
1019 return -ENOSPC
; /* make recognizable */
1022 return log_error_errno(errno
, "Failed to allocate backing file blocks: %m");
1025 log_info("Allocated additional %s.",
1026 format_bytes(buf
, sizeof(buf
), (DIV_ROUND_UP(st
->st_size
, 512) - st
->st_blocks
) * 512));
1030 int run_fallocate_by_path(const char *backing_path
) {
1031 _cleanup_close_
int backing_fd
= -1;
1033 backing_fd
= open(backing_path
, O_RDWR
|O_CLOEXEC
|O_NOCTTY
|O_NONBLOCK
);
1035 return log_error_errno(errno
, "Failed to open '%s' for fallocate(): %m", backing_path
);
1037 return run_fallocate(backing_fd
, NULL
);
1040 int home_prepare_luks(
1042 bool already_activated
,
1043 const char *force_image_path
,
1044 PasswordCache
*cache
,
1046 UserRecord
**ret_luks_home
) {
1048 sd_id128_t found_partition_uuid
, found_luks_uuid
, found_fs_uuid
;
1049 _cleanup_(user_record_unrefp
) UserRecord
*luks_home
= NULL
;
1050 _cleanup_(loop_device_unrefp
) LoopDevice
*loop
= NULL
;
1051 _cleanup_(crypt_freep
) struct crypt_device
*cd
= NULL
;
1052 _cleanup_(erase_and_freep
) void *volume_key
= NULL
;
1053 _cleanup_close_
int root_fd
= -1, image_fd
= -1;
1054 bool dm_activated
= false, mounted
= false;
1055 size_t volume_key_size
= 0;
1056 bool marked_dirty
= false;
1057 uint64_t offset
, size
;
1062 assert(setup
->dm_name
);
1063 assert(setup
->dm_node
);
1065 assert(user_record_storage(h
) == USER_LUKS
);
1067 if (already_activated
) {
1068 struct loop_info64 info
;
1071 r
= luks_open(setup
->dm_name
,
1081 r
= luks_validate_home_record(cd
, h
, volume_key
, cache
, &luks_home
);
1085 n
= crypt_get_device_name(cd
);
1087 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine backing device for DM %s.", setup
->dm_name
);
1089 r
= loop_device_open(n
, O_RDWR
, &loop
);
1091 return log_error_errno(r
, "Failed to open loopback device %s: %m", n
);
1093 if (ioctl(loop
->fd
, LOOP_GET_STATUS64
, &info
) < 0) {
1094 _cleanup_free_
char *sysfs
= NULL
;
1097 if (!IN_SET(errno
, ENOTTY
, EINVAL
))
1098 return log_error_errno(errno
, "Failed to get block device metrics of %s: %m", n
);
1100 if (ioctl(loop
->fd
, BLKGETSIZE64
, &size
) < 0)
1101 return log_error_errno(r
, "Failed to read block device size of %s: %m", n
);
1103 if (fstat(loop
->fd
, &st
) < 0)
1104 return log_error_errno(r
, "Failed to stat block device %s: %m", n
);
1105 assert(S_ISBLK(st
.st_mode
));
1107 if (asprintf(&sysfs
, "/sys/dev/block/%u:%u/partition", major(st
.st_rdev
), minor(st
.st_rdev
)) < 0)
1110 if (access(sysfs
, F_OK
) < 0) {
1111 if (errno
!= ENOENT
)
1112 return log_error_errno(errno
, "Failed to determine whether %s exists: %m", sysfs
);
1116 _cleanup_free_
char *buffer
= NULL
;
1118 if (asprintf(&sysfs
, "/sys/dev/block/%u:%u/start", major(st
.st_rdev
), minor(st
.st_rdev
)) < 0)
1121 r
= read_one_line_file(sysfs
, &buffer
);
1123 return log_error_errno(r
, "Failed to read partition start offset: %m");
1125 r
= safe_atou64(buffer
, &offset
);
1127 return log_error_errno(r
, "Failed to parse partition start offset: %m");
1129 if (offset
> UINT64_MAX
/ 512U)
1130 return log_error_errno(SYNTHETIC_ERRNO(E2BIG
), "Offset too large for 64 byte range, refusing.");
1135 offset
= info
.lo_offset
;
1136 size
= info
.lo_sizelimit
;
1139 found_partition_uuid
= found_fs_uuid
= SD_ID128_NULL
;
1141 log_info("Discovered used loopback device %s.", loop
->node
);
1143 root_fd
= open(user_record_home_directory(h
), O_RDONLY
|O_CLOEXEC
|O_DIRECTORY
|O_NOFOLLOW
);
1145 r
= log_error_errno(r
, "Failed to open home directory: %m");
1149 _cleanup_free_
char *fstype
= NULL
, *subdir
= NULL
;
1153 ip
= force_image_path
?: user_record_image_path(h
);
1155 subdir
= path_join("/run/systemd/user-home-mount/", user_record_user_name_and_realm(h
));
1159 image_fd
= open(ip
, O_RDWR
|O_CLOEXEC
|O_NOCTTY
|O_NONBLOCK
);
1161 return log_error_errno(errno
, "Failed to open image file %s: %m", ip
);
1163 if (fstat(image_fd
, &st
) < 0)
1164 return log_error_errno(errno
, "Failed to fstat() image file: %m");
1165 if (!S_ISREG(st
.st_mode
) && !S_ISBLK(st
.st_mode
))
1166 return log_error_errno(
1167 S_ISDIR(st
.st_mode
) ? SYNTHETIC_ERRNO(EISDIR
) : SYNTHETIC_ERRNO(EBADFD
),
1168 "Image file %s is not a regular file or block device: %m", ip
);
1170 r
= luks_validate(image_fd
, user_record_user_name_and_realm(h
), h
->partition_uuid
, &found_partition_uuid
, &offset
, &size
);
1172 return log_error_errno(r
, "Failed to validate disk label: %m");
1174 /* Everything before this point left the image untouched. We are now starting to make
1175 * changes, hence mark the image dirty */
1176 marked_dirty
= run_mark_dirty(image_fd
, true) > 0;
1178 if (!user_record_luks_discard(h
)) {
1179 r
= run_fallocate(image_fd
, &st
);
1184 r
= loop_device_make(image_fd
, O_RDWR
, offset
, size
, 0, &loop
);
1186 log_error_errno(r
, "Loopback block device support is not available on this system.");
1187 return -ENOLINK
; /* make recognizable */
1190 return log_error_errno(r
, "Failed to allocate loopback context: %m");
1192 log_info("Setting up loopback device %s completed.", loop
->node
?: ip
);
1194 r
= luks_setup(loop
->node
?: ip
,
1198 h
->luks_cipher_mode
,
1199 h
->luks_volume_key_size
,
1202 user_record_luks_discard(h
) || user_record_luks_offline_discard(h
),
1210 dm_activated
= true;
1212 r
= luks_validate_home_record(cd
, h
, volume_key
, cache
, &luks_home
);
1216 r
= fs_validate(setup
->dm_node
, h
->file_system_uuid
, &fstype
, &found_fs_uuid
);
1220 r
= run_fsck(setup
->dm_node
, fstype
);
1224 r
= home_unshare_and_mount(setup
->dm_node
, fstype
, user_record_luks_discard(h
), user_record_mount_flags(h
));
1230 root_fd
= open(subdir
, O_RDONLY
|O_CLOEXEC
|O_DIRECTORY
|O_NOFOLLOW
);
1232 r
= log_error_errno(r
, "Failed to open home directory: %m");
1236 if (user_record_luks_discard(h
))
1237 (void) run_fitrim(root_fd
);
1239 setup
->image_fd
= TAKE_FD(image_fd
);
1240 setup
->do_offline_fallocate
= !(setup
->do_offline_fitrim
= user_record_luks_offline_discard(h
));
1241 setup
->do_mark_clean
= marked_dirty
;
1244 setup
->loop
= TAKE_PTR(loop
);
1245 setup
->crypt_device
= TAKE_PTR(cd
);
1246 setup
->root_fd
= TAKE_FD(root_fd
);
1247 setup
->found_partition_uuid
= found_partition_uuid
;
1248 setup
->found_luks_uuid
= found_luks_uuid
;
1249 setup
->found_fs_uuid
= found_fs_uuid
;
1250 setup
->partition_offset
= offset
;
1251 setup
->partition_size
= size
;
1252 setup
->volume_key
= TAKE_PTR(volume_key
);
1253 setup
->volume_key_size
= volume_key_size
;
1255 setup
->undo_mount
= mounted
;
1256 setup
->undo_dm
= dm_activated
;
1259 *ret_luks_home
= TAKE_PTR(luks_home
);
1265 (void) umount_verbose(LOG_ERR
, "/run/systemd/user-home-mount", UMOUNT_NOFOLLOW
);
1268 (void) crypt_deactivate(cd
, setup
->dm_name
);
1270 if (image_fd
>= 0 && marked_dirty
)
1271 (void) run_mark_dirty(image_fd
, false);
1276 static void print_size_summary(uint64_t host_size
, uint64_t encrypted_size
, struct statfs
*sfs
) {
1277 char buffer1
[FORMAT_BYTES_MAX
], buffer2
[FORMAT_BYTES_MAX
], buffer3
[FORMAT_BYTES_MAX
], buffer4
[FORMAT_BYTES_MAX
];
1281 log_info("Image size is %s, file system size is %s, file system payload size is %s, file system free is %s.",
1282 format_bytes(buffer1
, sizeof(buffer1
), host_size
),
1283 format_bytes(buffer2
, sizeof(buffer2
), encrypted_size
),
1284 format_bytes(buffer3
, sizeof(buffer3
), (uint64_t) sfs
->f_blocks
* (uint64_t) sfs
->f_frsize
),
1285 format_bytes(buffer4
, sizeof(buffer4
), (uint64_t) sfs
->f_bfree
* (uint64_t) sfs
->f_frsize
));
1288 int home_activate_luks(
1290 PasswordCache
*cache
,
1291 UserRecord
**ret_home
) {
1293 _cleanup_(user_record_unrefp
) UserRecord
*new_home
= NULL
, *luks_home_record
= NULL
;
1294 _cleanup_(home_setup_undo
) HomeSetup setup
= HOME_SETUP_INIT
;
1295 uint64_t host_size
, encrypted_size
;
1296 const char *hdo
, *hd
;
1301 assert(user_record_storage(h
) == USER_LUKS
);
1304 assert_se(hdo
= user_record_home_directory(h
));
1305 hd
= strdupa(hdo
); /* copy the string out, since it might change later in the home record object */
1307 r
= make_dm_names(h
->user_name
, &setup
.dm_name
, &setup
.dm_node
);
1311 r
= access(setup
.dm_node
, F_OK
);
1313 if (errno
!= ENOENT
)
1314 return log_error_errno(errno
, "Failed to determine whether %s exists: %m", setup
.dm_node
);
1316 return log_error_errno(SYNTHETIC_ERRNO(EEXIST
), "Device mapper device %s already exists, refusing.", setup
.dm_node
);
1318 r
= home_prepare_luks(
1328 r
= block_get_size_by_fd(setup
.loop
->fd
, &host_size
);
1330 return log_error_errno(r
, "Failed to get loopback block device size: %m");
1332 r
= block_get_size_by_path(setup
.dm_node
, &encrypted_size
);
1334 return log_error_errno(r
, "Failed to get LUKS block device size: %m");
1346 r
= home_extend_embedded_identity(new_home
, h
, &setup
);
1350 setup
.root_fd
= safe_close(setup
.root_fd
);
1352 r
= home_move_mount(user_record_user_name_and_realm(h
), hd
);
1356 setup
.undo_mount
= false;
1357 setup
.do_offline_fitrim
= false;
1359 loop_device_relinquish(setup
.loop
);
1361 r
= crypt_deactivate_by_name(NULL
, setup
.dm_name
, CRYPT_DEACTIVATE_DEFERRED
);
1363 log_warning_errno(r
, "Failed to relinquish DM device, ignoring: %m");
1365 setup
.undo_dm
= false;
1366 setup
.do_offline_fallocate
= false;
1367 setup
.do_mark_clean
= false;
1369 log_info("Everything completed.");
1371 print_size_summary(host_size
, encrypted_size
, &sfs
);
1373 *ret_home
= TAKE_PTR(new_home
);
1377 int home_deactivate_luks(UserRecord
*h
) {
1378 _cleanup_(crypt_freep
) struct crypt_device
*cd
= NULL
;
1379 _cleanup_free_
char *dm_name
= NULL
, *dm_node
= NULL
;
1383 /* Note that the DM device and loopback device are set to auto-detach, hence strictly speaking we
1384 * don't have to explicitly have to detach them. However, we do that nonetheless (in case of the DM
1385 * device), to avoid races: by explicitly detaching them we know when the detaching is complete. We
1386 * don't bother about the loopback device because unlike the DM device it doesn't have a fixed
1389 r
= make_dm_names(h
->user_name
, &dm_name
, &dm_node
);
1393 r
= crypt_init_by_name(&cd
, dm_name
);
1394 if (IN_SET(r
, -ENODEV
, -EINVAL
, -ENOENT
)) {
1395 log_debug_errno(r
, "LUKS device %s has already been detached.", dm_name
);
1396 we_detached
= false;
1398 return log_error_errno(r
, "Failed to initialize cryptsetup context for %s: %m", dm_name
);
1400 log_info("Discovered used LUKS device %s.", dm_node
);
1402 cryptsetup_enable_logging(cd
);
1404 r
= crypt_deactivate(cd
, dm_name
);
1405 if (IN_SET(r
, -ENODEV
, -EINVAL
, -ENOENT
)) {
1406 log_debug_errno(r
, "LUKS device %s is already detached.", dm_node
);
1407 we_detached
= false;
1409 return log_info_errno(r
, "LUKS device %s couldn't be deactivated: %m", dm_node
);
1411 log_info("LUKS device detaching completed.");
1416 if (user_record_luks_offline_discard(h
))
1417 log_debug("Not allocating on logout.");
1419 (void) run_fallocate_by_path(user_record_image_path(h
));
1421 run_mark_dirty_by_path(user_record_image_path(h
), false);
1425 int home_trim_luks(UserRecord
*h
) {
1428 if (!user_record_luks_offline_discard(h
)) {
1429 log_debug("Not trimming on logout.");
1433 (void) run_fitrim_by_path(user_record_home_directory(h
));
1437 static struct crypt_pbkdf_type
* build_good_pbkdf(struct crypt_pbkdf_type
*buffer
, UserRecord
*hr
) {
1441 *buffer
= (struct crypt_pbkdf_type
) {
1442 .hash
= user_record_luks_pbkdf_hash_algorithm(hr
),
1443 .type
= user_record_luks_pbkdf_type(hr
),
1444 .time_ms
= user_record_luks_pbkdf_time_cost_usec(hr
) / USEC_PER_MSEC
,
1445 .max_memory_kb
= user_record_luks_pbkdf_memory_cost(hr
) / 1024,
1446 .parallel_threads
= user_record_luks_pbkdf_parallel_threads(hr
),
1452 static struct crypt_pbkdf_type
* build_minimal_pbkdf(struct crypt_pbkdf_type
*buffer
, UserRecord
*hr
) {
1456 /* For PKCS#11 derived keys (which are generated randomly and are of high quality already) we use a
1458 *buffer
= (struct crypt_pbkdf_type
) {
1459 .hash
= user_record_luks_pbkdf_hash_algorithm(hr
),
1460 .type
= CRYPT_KDF_PBKDF2
,
1468 static int luks_format(
1470 const char *dm_name
,
1473 const PasswordCache
*cache
,
1474 char **effective_passwords
,
1477 struct crypt_device
**ret
) {
1479 _cleanup_(user_record_unrefp
) UserRecord
*reduced
= NULL
;
1480 _cleanup_(crypt_freep
) struct crypt_device
*cd
= NULL
;
1481 _cleanup_(erase_and_freep
) void *volume_key
= NULL
;
1482 struct crypt_pbkdf_type good_pbkdf
, minimal_pbkdf
;
1483 char suuid
[ID128_UUID_STRING_MAX
], **pp
;
1484 _cleanup_free_
char *text
= NULL
;
1485 size_t volume_key_size
;
1493 r
= crypt_init(&cd
, node
);
1495 return log_error_errno(r
, "Failed to allocate libcryptsetup context: %m");
1497 cryptsetup_enable_logging(cd
);
1499 /* Normally we'd, just leave volume key generation to libcryptsetup. However, we can't, since we
1500 * can't extract the volume key from the library again, but we need it in order to encrypt the JSON
1501 * record. Hence, let's generate it on our own, so that we can keep track of it. */
1503 volume_key_size
= user_record_luks_volume_key_size(hr
);
1504 volume_key
= malloc(volume_key_size
);
1508 r
= genuine_random_bytes(volume_key
, volume_key_size
, RANDOM_BLOCK
);
1510 return log_error_errno(r
, "Failed to generate volume key: %m");
1512 #if HAVE_CRYPT_SET_METADATA_SIZE
1513 /* Increase the metadata space to 4M, the largest LUKS2 supports */
1514 r
= crypt_set_metadata_size(cd
, 4096U*1024U, 0);
1516 return log_error_errno(r
, "Failed to change LUKS2 metadata size: %m");
1519 build_good_pbkdf(&good_pbkdf
, hr
);
1520 build_minimal_pbkdf(&minimal_pbkdf
, hr
);
1522 r
= crypt_format(cd
,
1524 user_record_luks_cipher(hr
),
1525 user_record_luks_cipher_mode(hr
),
1526 id128_to_uuid_string(uuid
, suuid
),
1529 &(struct crypt_params_luks2
) {
1531 .subsystem
= "systemd-home",
1532 .sector_size
= 512U,
1533 .pbkdf
= &good_pbkdf
,
1536 return log_error_errno(r
, "Failed to format LUKS image: %m");
1538 log_info("LUKS formatting completed.");
1540 STRV_FOREACH(pp
, effective_passwords
) {
1542 if (strv_contains(cache
->pkcs11_passwords
, *pp
) ||
1543 strv_contains(cache
->fido2_passwords
, *pp
)) {
1544 log_debug("Using minimal PBKDF for slot %i", slot
);
1545 r
= crypt_set_pbkdf_type(cd
, &minimal_pbkdf
);
1547 log_debug("Using good PBKDF for slot %i", slot
);
1548 r
= crypt_set_pbkdf_type(cd
, &good_pbkdf
);
1551 return log_error_errno(r
, "Failed to tweak PBKDF for slot %i: %m", slot
);
1553 r
= crypt_keyslot_add_by_volume_key(
1561 return log_error_errno(r
, "Failed to set up LUKS password for slot %i: %m", slot
);
1563 log_info("Writing password to LUKS keyslot %i completed.", slot
);
1567 r
= crypt_activate_by_volume_key(
1572 discard
? CRYPT_ACTIVATE_ALLOW_DISCARDS
: 0);
1574 return log_error_errno(r
, "Failed to activate LUKS superblock: %m");
1576 log_info("LUKS activation by volume key succeeded.");
1578 r
= user_record_clone(hr
, USER_RECORD_EXTRACT_EMBEDDED
|USER_RECORD_PERMISSIVE
, &reduced
);
1580 return log_error_errno(r
, "Failed to prepare home record for LUKS: %m");
1582 r
= format_luks_token_text(cd
, reduced
, volume_key
, &text
);
1586 r
= crypt_token_json_set(cd
, CRYPT_ANY_TOKEN
, text
);
1588 return log_error_errno(r
, "Failed to set LUKS JSON token: %m");
1590 log_info("Writing user record as LUKS token completed.");
1593 *ret
= TAKE_PTR(cd
);
1598 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(struct fdisk_context
*, fdisk_unref_context
, NULL
);
1599 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(struct fdisk_partition
*, fdisk_unref_partition
, NULL
);
1600 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(struct fdisk_parttype
*, fdisk_unref_parttype
, NULL
);
1601 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(struct fdisk_table
*, fdisk_unref_table
, NULL
);
1603 static int make_partition_table(
1607 uint64_t *ret_offset
,
1609 sd_id128_t
*ret_disk_uuid
) {
1611 _cleanup_(fdisk_unref_partitionp
) struct fdisk_partition
*p
= NULL
, *q
= NULL
;
1612 _cleanup_(fdisk_unref_parttypep
) struct fdisk_parttype
*t
= NULL
;
1613 _cleanup_(fdisk_unref_contextp
) struct fdisk_context
*c
= NULL
;
1614 _cleanup_free_
char *path
= NULL
, *disk_uuid_as_string
= NULL
;
1615 uint64_t offset
, size
;
1616 sd_id128_t disk_uuid
;
1617 char uuids
[ID128_UUID_STRING_MAX
];
1625 t
= fdisk_new_parttype();
1629 r
= fdisk_parttype_set_typestr(t
, "773f91ef-66d4-49b5-bd83-d683bf40ad16");
1631 return log_error_errno(r
, "Failed to initialize partition type: %m");
1633 c
= fdisk_new_context();
1637 if (asprintf(&path
, "/proc/self/fd/%i", fd
) < 0)
1640 r
= fdisk_assign_device(c
, path
, 0);
1642 return log_error_errno(r
, "Failed to open device: %m");
1644 r
= fdisk_create_disklabel(c
, "gpt");
1646 return log_error_errno(r
, "Failed to create GPT disk label: %m");
1648 p
= fdisk_new_partition();
1652 r
= fdisk_partition_set_type(p
, t
);
1654 return log_error_errno(r
, "Failed to set partition type: %m");
1656 r
= fdisk_partition_start_follow_default(p
, 1);
1658 return log_error_errno(r
, "Failed to place partition at beginning of space: %m");
1660 r
= fdisk_partition_partno_follow_default(p
, 1);
1662 return log_error_errno(r
, "Failed to place partition at first free partition index: %m");
1664 r
= fdisk_partition_end_follow_default(p
, 1);
1666 return log_error_errno(r
, "Failed to make partition cover all free space: %m");
1668 r
= fdisk_partition_set_name(p
, label
);
1670 return log_error_errno(r
, "Failed to set partition name: %m");
1672 r
= fdisk_partition_set_uuid(p
, id128_to_uuid_string(uuid
, uuids
));
1674 return log_error_errno(r
, "Failed to set partition UUID: %m");
1676 r
= fdisk_add_partition(c
, p
, NULL
);
1678 return log_error_errno(r
, "Failed to add partition: %m");
1680 r
= fdisk_write_disklabel(c
);
1682 return log_error_errno(r
, "Failed to write disk label: %m");
1684 r
= fdisk_get_disklabel_id(c
, &disk_uuid_as_string
);
1686 return log_error_errno(r
, "Failed to determine disk label UUID: %m");
1688 r
= sd_id128_from_string(disk_uuid_as_string
, &disk_uuid
);
1690 return log_error_errno(r
, "Failed to parse disk label UUID: %m");
1692 r
= fdisk_get_partition(c
, 0, &q
);
1694 return log_error_errno(r
, "Failed to read created partition metadata: %m");
1696 assert(fdisk_partition_has_start(q
));
1697 offset
= fdisk_partition_get_start(q
);
1698 if (offset
> UINT64_MAX
/ 512U)
1699 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
), "Partition offset too large.");
1701 assert(fdisk_partition_has_size(q
));
1702 size
= fdisk_partition_get_size(q
);
1703 if (size
> UINT64_MAX
/ 512U)
1704 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
), "Partition size too large.");
1706 *ret_offset
= offset
* 512U;
1707 *ret_size
= size
* 512U;
1708 *ret_disk_uuid
= disk_uuid
;
1713 static bool supported_fs_size(const char *fstype
, uint64_t host_size
) {
1716 m
= minimal_size_by_fs_name(fstype
);
1717 if (m
== UINT64_MAX
)
1720 return host_size
>= m
;
1723 static int wait_for_devlink(const char *path
) {
1724 _cleanup_close_
int inotify_fd
= -1;
1728 /* let's wait for a device link to show up in /dev, with a timeout. This is good to do since we
1729 * return a /dev/disk/by-uuid/… link to our callers and they likely want to access it right-away,
1730 * hence let's wait until udev has caught up with our changes, and wait for the symlink to be
1733 until
= usec_add(now(CLOCK_MONOTONIC
), 45 * USEC_PER_SEC
);
1736 _cleanup_free_
char *dn
= NULL
;
1739 if (laccess(path
, F_OK
) < 0) {
1740 if (errno
!= ENOENT
)
1741 return log_error_errno(errno
, "Failed to determine whether %s exists: %m", path
);
1743 return 0; /* Found it */
1745 if (inotify_fd
< 0) {
1746 /* We need to wait for the device symlink to show up, let's create an inotify watch for it */
1747 inotify_fd
= inotify_init1(IN_NONBLOCK
|IN_CLOEXEC
);
1749 return log_error_errno(errno
, "Failed to allocate inotify fd: %m");
1752 dn
= dirname_malloc(path
);
1757 log_info("Watching %s", dn
);
1759 if (inotify_add_watch(inotify_fd
, dn
, IN_CREATE
|IN_MOVED_TO
|IN_ONLYDIR
|IN_DELETE_SELF
|IN_MOVE_SELF
) < 0) {
1760 if (errno
!= ENOENT
)
1761 return log_error_errno(errno
, "Failed to add watch on %s: %m", dn
);
1765 if (empty_or_root(dn
))
1768 dn
= dirname_malloc(dn
);
1771 w
= now(CLOCK_MONOTONIC
);
1773 return log_error_errno(SYNTHETIC_ERRNO(ETIMEDOUT
), "Device link %s still hasn't shown up, giving up.", path
);
1775 r
= fd_wait_for_event(inotify_fd
, POLLIN
, usec_sub_unsigned(until
, w
));
1777 return log_error_errno(r
, "Failed to watch inotify: %m");
1779 (void) flush_fd(inotify_fd
);
1783 static int calculate_disk_size(UserRecord
*h
, const char *parent_dir
, uint64_t *ret
) {
1784 char buf
[FORMAT_BYTES_MAX
];
1792 if (h
->disk_size
!= UINT64_MAX
) {
1793 *ret
= DISK_SIZE_ROUND_DOWN(h
->disk_size
);
1797 if (statfs(parent_dir
, &sfs
) < 0)
1798 return log_error_errno(errno
, "statfs() on %s failed: %m", parent_dir
);
1800 m
= sfs
.f_bsize
* sfs
.f_bavail
;
1802 if (h
->disk_size_relative
== UINT64_MAX
) {
1804 if (m
> UINT64_MAX
/ USER_DISK_SIZE_DEFAULT_PERCENT
)
1805 return log_error_errno(SYNTHETIC_ERRNO(EOVERFLOW
), "Disk size too large.");
1807 *ret
= DISK_SIZE_ROUND_DOWN(m
* USER_DISK_SIZE_DEFAULT_PERCENT
/ 100);
1809 log_info("Sizing home to %u%% of available disk space, which is %s.",
1810 USER_DISK_SIZE_DEFAULT_PERCENT
,
1811 format_bytes(buf
, sizeof(buf
), *ret
));
1813 *ret
= DISK_SIZE_ROUND_DOWN((uint64_t) ((double) m
* (double) h
->disk_size_relative
/ (double) UINT32_MAX
));
1815 log_info("Sizing home to %" PRIu64
".%01" PRIu64
"%% of available disk space, which is %s.",
1816 (h
->disk_size_relative
* 100) / UINT32_MAX
,
1817 ((h
->disk_size_relative
* 1000) / UINT32_MAX
) % 10,
1818 format_bytes(buf
, sizeof(buf
), *ret
));
1821 if (*ret
< USER_DISK_SIZE_MIN
)
1822 *ret
= USER_DISK_SIZE_MIN
;
1827 static int home_truncate(
1840 trunc
= user_record_luks_discard(h
);
1842 r
= fallocate(fd
, 0, 0, size
);
1843 if (r
< 0 && ERRNO_IS_NOT_SUPPORTED(errno
)) {
1844 /* Some file systems do not support fallocate(), let's gracefully degrade
1845 * (ZFS, reiserfs, …) and fall back to truncation */
1846 log_notice_errno(errno
, "Backing file system does not support fallocate(), falling back to ftruncate(), i.e. implicitly using non-discard mode.");
1852 r
= ftruncate(fd
, size
);
1855 if (ERRNO_IS_DISK_SPACE(errno
)) {
1856 log_error_errno(errno
, "Not enough disk space to allocate home.");
1857 return -ENOSPC
; /* make recognizable */
1860 return log_error_errno(errno
, "Failed to truncate home image %s: %m", path
);
1866 int home_create_luks(
1868 PasswordCache
*cache
,
1869 char **effective_passwords
,
1870 UserRecord
**ret_home
) {
1872 _cleanup_free_
char *dm_name
= NULL
, *dm_node
= NULL
, *subdir
= NULL
, *disk_uuid_path
= NULL
, *temporary_image_path
= NULL
;
1873 uint64_t encrypted_size
,
1874 host_size
= 0, partition_offset
= 0, partition_size
= 0; /* Unnecessary initialization to appease gcc */
1875 bool image_created
= false, dm_activated
= false, mounted
= false;
1876 _cleanup_(user_record_unrefp
) UserRecord
*new_home
= NULL
;
1877 sd_id128_t partition_uuid
, fs_uuid
, luks_uuid
, disk_uuid
;
1878 _cleanup_(loop_device_unrefp
) LoopDevice
*loop
= NULL
;
1879 _cleanup_(crypt_freep
) struct crypt_device
*cd
= NULL
;
1880 _cleanup_close_
int image_fd
= -1, root_fd
= -1;
1881 const char *fstype
, *ip
;
1886 assert(h
->storage
< 0 || h
->storage
== USER_LUKS
);
1889 assert_se(ip
= user_record_image_path(h
));
1891 fstype
= user_record_file_system_type(h
);
1892 if (!supported_fstype(fstype
))
1893 return log_error_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT
), "Unsupported file system type: %s", fstype
);
1895 r
= mkfs_exists(fstype
);
1897 return log_error_errno(r
, "Failed to check if mkfs binary for %s exists: %m", fstype
);
1899 if (h
->file_system_type
|| streq(fstype
, "ext4") || !supported_fstype("ext4"))
1900 return log_error_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT
), "mkfs binary for file system type %s does not exist.", fstype
);
1902 /* If the record does not explicitly declare a file system to use, and the compiled-in
1903 * default does not actually exist, than do an automatic fallback onto ext4, as the baseline
1904 * fs of Linux. We won't search for a working fs type here beyond ext4, i.e. nothing fancier
1905 * than a single, conservative fallback to baseline. This should be useful in minimal
1906 * environments where mkfs.btrfs or so are not made available, but mkfs.ext4 as Linux' most
1907 * boring, most basic fs is. */
1908 log_info("Formatting tool for compiled-in default file system %s not available, falling back to ext4 instead.", fstype
);
1912 if (sd_id128_is_null(h
->partition_uuid
)) {
1913 r
= sd_id128_randomize(&partition_uuid
);
1915 return log_error_errno(r
, "Failed to acquire partition UUID: %m");
1917 partition_uuid
= h
->partition_uuid
;
1919 if (sd_id128_is_null(h
->luks_uuid
)) {
1920 r
= sd_id128_randomize(&luks_uuid
);
1922 return log_error_errno(r
, "Failed to acquire LUKS UUID: %m");
1924 luks_uuid
= h
->luks_uuid
;
1926 if (sd_id128_is_null(h
->file_system_uuid
)) {
1927 r
= sd_id128_randomize(&fs_uuid
);
1929 return log_error_errno(r
, "Failed to acquire file system UUID: %m");
1931 fs_uuid
= h
->file_system_uuid
;
1933 r
= make_dm_names(h
->user_name
, &dm_name
, &dm_node
);
1937 r
= access(dm_node
, F_OK
);
1939 if (errno
!= ENOENT
)
1940 return log_error_errno(errno
, "Failed to determine whether %s exists: %m", dm_node
);
1942 return log_error_errno(SYNTHETIC_ERRNO(EEXIST
), "Device mapper device %s already exists, refusing.", dm_node
);
1944 if (path_startswith(ip
, "/dev/")) {
1945 _cleanup_free_
char *sysfs
= NULL
;
1946 uint64_t block_device_size
;
1949 /* Let's place the home directory on a real device, i.e. an USB stick or such */
1951 image_fd
= open(ip
, O_RDWR
|O_CLOEXEC
|O_NOCTTY
|O_NONBLOCK
);
1953 return log_error_errno(errno
, "Failed to open device %s: %m", ip
);
1955 if (fstat(image_fd
, &st
) < 0)
1956 return log_error_errno(errno
, "Failed to stat device %s: %m", ip
);
1957 if (!S_ISBLK(st
.st_mode
))
1958 return log_error_errno(SYNTHETIC_ERRNO(ENOTBLK
), "Device is not a block device, refusing.");
1960 if (asprintf(&sysfs
, "/sys/dev/block/%u:%u/partition", major(st
.st_rdev
), minor(st
.st_rdev
)) < 0)
1962 if (access(sysfs
, F_OK
) < 0) {
1963 if (errno
!= ENOENT
)
1964 return log_error_errno(errno
, "Failed to check whether %s exists: %m", sysfs
);
1966 return log_error_errno(SYNTHETIC_ERRNO(ENOTBLK
), "Operating on partitions is currently not supported, sorry. Please specify a top-level block device.");
1968 if (flock(image_fd
, LOCK_EX
) < 0) /* make sure udev doesn't read from it while we operate on the device */
1969 return log_error_errno(errno
, "Failed to lock block device %s: %m", ip
);
1971 if (ioctl(image_fd
, BLKGETSIZE64
, &block_device_size
) < 0)
1972 return log_error_errno(errno
, "Failed to read block device size: %m");
1974 if (h
->disk_size
== UINT64_MAX
) {
1976 /* If a relative disk size is requested, apply it relative to the block device size */
1977 if (h
->disk_size_relative
< UINT32_MAX
)
1978 host_size
= CLAMP(DISK_SIZE_ROUND_DOWN(block_device_size
* h
->disk_size_relative
/ UINT32_MAX
),
1979 USER_DISK_SIZE_MIN
, USER_DISK_SIZE_MAX
);
1981 host_size
= block_device_size
; /* Otherwise, take the full device */
1983 } else if (h
->disk_size
> block_device_size
)
1984 return log_error_errno(SYNTHETIC_ERRNO(EMSGSIZE
), "Selected disk size larger than backing block device, refusing.");
1986 host_size
= DISK_SIZE_ROUND_DOWN(h
->disk_size
);
1988 if (!supported_fs_size(fstype
, host_size
))
1989 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
),
1990 "Selected file system size too small for %s.", fstype
);
1992 /* After creation we should reference this partition by its UUID instead of the block
1993 * device. That's preferable since the user might have specified a device node such as
1994 * /dev/sdb to us, which might look very different when replugged. */
1995 if (asprintf(&disk_uuid_path
, "/dev/disk/by-uuid/" SD_ID128_UUID_FORMAT_STR
, SD_ID128_FORMAT_VAL(luks_uuid
)) < 0)
1998 if (user_record_luks_discard(h
) || user_record_luks_offline_discard(h
)) {
1999 /* If we want online or offline discard, discard once before we start using things. */
2001 if (ioctl(image_fd
, BLKDISCARD
, (uint64_t[]) { 0, block_device_size
}) < 0)
2002 log_full_errno(errno
== EOPNOTSUPP
? LOG_DEBUG
: LOG_WARNING
, errno
,
2003 "Failed to issue full-device BLKDISCARD on device, ignoring: %m");
2005 log_info("Full device discard completed.");
2008 _cleanup_free_
char *parent
= NULL
;
2010 parent
= dirname_malloc(ip
);
2014 r
= mkdir_p(parent
, 0755);
2016 return log_error_errno(r
, "Failed to create parent directory %s: %m", parent
);
2018 r
= calculate_disk_size(h
, parent
, &host_size
);
2022 if (!supported_fs_size(fstype
, host_size
))
2023 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
), "Selected file system size too small for %s.", fstype
);
2025 r
= tempfn_random(ip
, "homework", &temporary_image_path
);
2027 return log_error_errno(r
, "Failed to derive temporary file name for %s: %m", ip
);
2029 image_fd
= open(temporary_image_path
, O_RDWR
|O_CREAT
|O_EXCL
|O_CLOEXEC
|O_NOCTTY
|O_NOFOLLOW
, 0600);
2031 return log_error_errno(errno
, "Failed to create home image %s: %m", temporary_image_path
);
2033 image_created
= true;
2035 r
= chattr_fd(image_fd
, FS_NOCOW_FL
, FS_NOCOW_FL
, NULL
);
2037 log_full_errno(ERRNO_IS_NOT_SUPPORTED(r
) ? LOG_DEBUG
: LOG_WARNING
, r
,
2038 "Failed to set file attributes on %s, ignoring: %m", temporary_image_path
);
2040 r
= home_truncate(h
, image_fd
, temporary_image_path
, host_size
);
2044 log_info("Allocating image file completed.");
2047 r
= make_partition_table(
2049 user_record_user_name_and_realm(h
),
2057 log_info("Writing of partition table completed.");
2059 r
= loop_device_make(image_fd
, O_RDWR
, partition_offset
, partition_size
, 0, &loop
);
2061 if (r
== -ENOENT
) { /* this means /dev/loop-control doesn't exist, i.e. we are in a container
2062 * or similar and loopback bock devices are not available, return a
2063 * recognizable error in this case. */
2064 log_error_errno(r
, "Loopback block device support is not available on this system.");
2069 log_error_errno(r
, "Failed to set up loopback device for %s: %m", temporary_image_path
);
2073 r
= loop_device_flock(loop
, LOCK_EX
); /* make sure udev won't read before we are done */
2075 log_error_errno(r
, "Failed to take lock on loop device: %m");
2079 log_info("Setting up loopback device %s completed.", loop
->node
?: ip
);
2081 r
= luks_format(loop
->node
,
2084 user_record_user_name_and_realm(h
),
2086 effective_passwords
,
2087 user_record_luks_discard(h
) || user_record_luks_offline_discard(h
),
2093 dm_activated
= true;
2095 r
= block_get_size_by_path(dm_node
, &encrypted_size
);
2097 log_error_errno(r
, "Failed to get encrypted block device size: %m");
2101 log_info("Setting up LUKS device %s completed.", dm_node
);
2103 r
= make_filesystem(dm_node
, fstype
, user_record_user_name_and_realm(h
), fs_uuid
, user_record_luks_discard(h
));
2107 log_info("Formatting file system completed.");
2109 r
= home_unshare_and_mount(dm_node
, fstype
, user_record_luks_discard(h
), user_record_mount_flags(h
));
2115 subdir
= path_join("/run/systemd/user-home-mount/", user_record_user_name_and_realm(h
));
2121 /* Prefer using a btrfs subvolume if we can, fall back to directory otherwise */
2122 r
= btrfs_subvol_make_fallback(subdir
, 0700);
2124 log_error_errno(r
, "Failed to create user directory in mounted image file: %m");
2128 root_fd
= open(subdir
, O_RDONLY
|O_CLOEXEC
|O_DIRECTORY
|O_NOFOLLOW
);
2130 r
= log_error_errno(errno
, "Failed to open user directory in mounted image file: %m");
2134 r
= home_populate(h
, root_fd
);
2138 r
= home_sync_and_statfs(root_fd
, &sfs
);
2142 r
= user_record_clone(h
, USER_RECORD_LOAD_MASK_SECRET
|USER_RECORD_LOG
|USER_RECORD_PERMISSIVE
, &new_home
);
2144 log_error_errno(r
, "Failed to clone record: %m");
2148 r
= user_record_add_binding(
2151 disk_uuid_path
?: ip
,
2155 crypt_get_cipher(cd
),
2156 crypt_get_cipher_mode(cd
),
2157 luks_volume_key_size_convert(cd
),
2163 log_error_errno(r
, "Failed to add binding to record: %m");
2167 if (user_record_luks_offline_discard(h
)) {
2168 r
= run_fitrim(root_fd
);
2173 root_fd
= safe_close(root_fd
);
2175 r
= umount_verbose(LOG_ERR
, "/run/systemd/user-home-mount", UMOUNT_NOFOLLOW
);
2181 r
= crypt_deactivate(cd
, dm_name
);
2183 log_error_errno(r
, "Failed to deactivate LUKS device: %m");
2190 dm_activated
= false;
2192 loop
= loop_device_unref(loop
);
2194 if (!user_record_luks_offline_discard(h
)) {
2195 r
= run_fallocate(image_fd
, NULL
/* refresh stat() data */);
2200 /* Sync everything to disk before we move things into place under the final name. */
2201 if (fsync(image_fd
) < 0) {
2202 r
= log_error_errno(r
, "Failed to synchronize image to disk: %m");
2207 (void) ioctl(image_fd
, BLKRRPART
, 0);
2209 /* If we operate on a file, sync the containing directory too. */
2210 r
= fsync_directory_of_file(image_fd
);
2212 log_error_errno(r
, "Failed to synchronize directory of image file to disk: %m");
2217 /* Let's close the image fd now. If we are operating on a real block device this will release the BSD
2218 * lock that ensures udev doesn't interfere with what we are doing */
2219 image_fd
= safe_close(image_fd
);
2221 if (temporary_image_path
) {
2222 if (rename(temporary_image_path
, ip
) < 0) {
2223 log_error_errno(errno
, "Failed to rename image file: %m");
2227 log_info("Moved image file into place.");
2231 (void) wait_for_devlink(disk_uuid_path
);
2233 log_info("Everything completed.");
2235 print_size_summary(host_size
, encrypted_size
, &sfs
);
2237 *ret_home
= TAKE_PTR(new_home
);
2241 /* Let's close all files before we unmount the file system, to avoid EBUSY */
2242 root_fd
= safe_close(root_fd
);
2245 (void) umount_verbose(LOG_WARNING
, "/run/systemd/user-home-mount", UMOUNT_NOFOLLOW
);
2248 (void) crypt_deactivate(cd
, dm_name
);
2250 loop
= loop_device_unref(loop
);
2253 (void) unlink(temporary_image_path
);
2258 int home_validate_update_luks(UserRecord
*h
, HomeSetup
*setup
) {
2259 _cleanup_free_
char *dm_name
= NULL
, *dm_node
= NULL
;
2265 r
= make_dm_names(h
->user_name
, &dm_name
, &dm_node
);
2269 r
= access(dm_node
, F_OK
);
2270 if (r
< 0 && errno
!= ENOENT
)
2271 return log_error_errno(errno
, "Failed to determine whether %s exists: %m", dm_node
);
2273 free_and_replace(setup
->dm_name
, dm_name
);
2274 free_and_replace(setup
->dm_node
, dm_node
);
2284 static int can_resize_fs(int fd
, uint64_t old_size
, uint64_t new_size
) {
2289 /* Filter out bogus requests early */
2290 if (old_size
== 0 || old_size
== UINT64_MAX
||
2291 new_size
== 0 || new_size
== UINT64_MAX
)
2292 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Invalid resize parameters.");
2294 if ((old_size
& 511) != 0 || (new_size
& 511) != 0)
2295 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Resize parameters not multiple of 512.");
2297 if (fstatfs(fd
, &sfs
) < 0)
2298 return log_error_errno(errno
, "Failed to fstatfs() file system: %m");
2300 if (is_fs_type(&sfs
, BTRFS_SUPER_MAGIC
)) {
2302 if (new_size
< BTRFS_MINIMAL_SIZE
)
2303 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
), "New file system size too small for btrfs (needs to be 256M at least.");
2305 /* btrfs can grow and shrink online */
2307 } else if (is_fs_type(&sfs
, XFS_SB_MAGIC
)) {
2309 if (new_size
< XFS_MINIMAL_SIZE
)
2310 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
), "New file system size too small for xfs (needs to be 14M at least).");
2312 /* XFS can grow, but not shrink */
2313 if (new_size
< old_size
)
2314 return log_error_errno(SYNTHETIC_ERRNO(EMSGSIZE
), "Shrinking this type of file system is not supported.");
2316 } else if (is_fs_type(&sfs
, EXT4_SUPER_MAGIC
)) {
2318 if (new_size
< EXT4_MINIMAL_SIZE
)
2319 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
), "New file system size too small for ext4 (needs to be 1M at least).");
2321 /* ext4 can grow online, and shrink offline */
2322 if (new_size
< old_size
)
2323 return CAN_RESIZE_OFFLINE
;
2326 return log_error_errno(SYNTHETIC_ERRNO(ESOCKTNOSUPPORT
), "Resizing this type of file system is not supported.");
2328 return CAN_RESIZE_ONLINE
;
2331 static int ext4_offline_resize_fs(HomeSetup
*setup
, uint64_t new_size
, bool discard
, unsigned long flags
) {
2332 _cleanup_free_
char *size_str
= NULL
;
2333 bool re_open
= false, re_mount
= false;
2334 pid_t resize_pid
, fsck_pid
;
2338 assert(setup
->dm_node
);
2340 /* First, unmount the file system */
2341 if (setup
->root_fd
>= 0) {
2342 setup
->root_fd
= safe_close(setup
->root_fd
);
2346 if (setup
->undo_mount
) {
2347 r
= umount_verbose(LOG_ERR
, "/run/systemd/user-home-mount", UMOUNT_NOFOLLOW
);
2351 setup
->undo_mount
= false;
2355 log_info("Temporary unmounting of file system completed.");
2357 /* resize2fs requires that the file system is force checked first, do so. */
2358 r
= safe_fork("(e2fsck)",
2359 FORK_RESET_SIGNALS
|FORK_RLIMIT_NOFILE_SAFE
|FORK_DEATHSIG
|FORK_LOG
|FORK_STDOUT_TO_STDERR
|FORK_CLOSE_ALL_FDS
,
2365 execlp("e2fsck" ,"e2fsck", "-fp", setup
->dm_node
, NULL
);
2367 log_error_errno(errno
, "Failed to execute e2fsck: %m");
2368 _exit(EXIT_FAILURE
);
2371 exit_status
= wait_for_terminate_and_check("e2fsck", fsck_pid
, WAIT_LOG_ABNORMAL
);
2372 if (exit_status
< 0)
2374 if ((exit_status
& ~FSCK_ERROR_CORRECTED
) != 0) {
2375 log_warning("e2fsck failed with exit status %i.", exit_status
);
2377 if ((exit_status
& (FSCK_SYSTEM_SHOULD_REBOOT
|FSCK_ERRORS_LEFT_UNCORRECTED
)) != 0)
2378 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "File system is corrupted, refusing.");
2380 log_warning("Ignoring fsck error.");
2383 log_info("Forced file system check completed.");
2385 /* We use 512 sectors here, because resize2fs doesn't do byte sizes */
2386 if (asprintf(&size_str
, "%" PRIu64
"s", new_size
/ 512) < 0)
2389 /* Resize the thing */
2390 r
= safe_fork("(e2resize)",
2391 FORK_RESET_SIGNALS
|FORK_RLIMIT_NOFILE_SAFE
|FORK_DEATHSIG
|FORK_LOG
|FORK_WAIT
|FORK_STDOUT_TO_STDERR
|FORK_CLOSE_ALL_FDS
,
2397 execlp("resize2fs" ,"resize2fs", setup
->dm_node
, size_str
, NULL
);
2399 log_error_errno(errno
, "Failed to execute resize2fs: %m");
2400 _exit(EXIT_FAILURE
);
2403 log_info("Offline file system resize completed.");
2405 /* Re-establish mounts and reopen the directory */
2407 r
= home_mount_node(setup
->dm_node
, "ext4", discard
, flags
);
2411 setup
->undo_mount
= true;
2415 setup
->root_fd
= open("/run/systemd/user-home-mount", O_RDONLY
|O_CLOEXEC
|O_DIRECTORY
|O_NOFOLLOW
);
2416 if (setup
->root_fd
< 0)
2417 return log_error_errno(errno
, "Failed to reopen file system: %m");
2420 log_info("File system mounted again.");
2425 static int prepare_resize_partition(
2427 uint64_t partition_offset
,
2428 uint64_t old_partition_size
,
2429 uint64_t new_partition_size
,
2430 sd_id128_t
*ret_disk_uuid
,
2431 struct fdisk_table
**ret_table
) {
2433 _cleanup_(fdisk_unref_contextp
) struct fdisk_context
*c
= NULL
;
2434 _cleanup_(fdisk_unref_tablep
) struct fdisk_table
*t
= NULL
;
2435 _cleanup_free_
char *path
= NULL
, *disk_uuid_as_string
= NULL
;
2436 size_t n_partitions
;
2437 sd_id128_t disk_uuid
;
2442 assert(ret_disk_uuid
);
2445 assert((partition_offset
& 511) == 0);
2446 assert((old_partition_size
& 511) == 0);
2447 assert((new_partition_size
& 511) == 0);
2448 assert(UINT64_MAX
- old_partition_size
>= partition_offset
);
2449 assert(UINT64_MAX
- new_partition_size
>= partition_offset
);
2451 if (partition_offset
== 0) {
2452 /* If the offset is at the beginning we assume no partition table, let's exit early. */
2453 log_debug("Not rewriting partition table, operating on naked device.");
2454 *ret_disk_uuid
= SD_ID128_NULL
;
2459 c
= fdisk_new_context();
2463 if (asprintf(&path
, "/proc/self/fd/%i", fd
) < 0)
2466 r
= fdisk_assign_device(c
, path
, 0);
2468 return log_error_errno(r
, "Failed to open device: %m");
2470 if (!fdisk_is_labeltype(c
, FDISK_DISKLABEL_GPT
))
2471 return log_error_errno(SYNTHETIC_ERRNO(ENOMEDIUM
), "Disk has no GPT partition table.");
2473 r
= fdisk_get_disklabel_id(c
, &disk_uuid_as_string
);
2475 return log_error_errno(r
, "Failed to acquire disk UUID: %m");
2477 r
= sd_id128_from_string(disk_uuid_as_string
, &disk_uuid
);
2479 return log_error_errno(r
, "Failed parse disk UUID: %m");
2481 r
= fdisk_get_partitions(c
, &t
);
2483 return log_error_errno(r
, "Failed to acquire partition table: %m");
2485 n_partitions
= fdisk_table_get_nents(t
);
2486 for (size_t i
= 0; i
< n_partitions
; i
++) {
2487 struct fdisk_partition
*p
;
2489 p
= fdisk_table_get_partition(t
, i
);
2491 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "Failed to read partition metadata: %m");
2493 if (fdisk_partition_is_used(p
) <= 0)
2495 if (fdisk_partition_has_start(p
) <= 0 || fdisk_partition_has_size(p
) <= 0 || fdisk_partition_has_end(p
) <= 0)
2496 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Found partition without a size.");
2498 if (fdisk_partition_get_start(p
) == partition_offset
/ 512U &&
2499 fdisk_partition_get_size(p
) == old_partition_size
/ 512U) {
2502 return log_error_errno(SYNTHETIC_ERRNO(ENOTUNIQ
), "Partition found twice, refusing.");
2504 /* Found our partition, now patch it */
2505 r
= fdisk_partition_size_explicit(p
, 1);
2507 return log_error_errno(r
, "Failed to enable explicit partition size: %m");
2509 r
= fdisk_partition_set_size(p
, new_partition_size
/ 512U);
2511 return log_error_errno(r
, "Failed to change partition size: %m");
2517 if (fdisk_partition_get_start(p
) < partition_offset
+ new_partition_size
/ 512U &&
2518 fdisk_partition_get_end(p
) >= partition_offset
/ 512)
2519 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Can't extend, conflicting partition found.");
2524 return log_error_errno(SYNTHETIC_ERRNO(ENOPKG
), "Failed to find matching partition to resize.");
2526 *ret_table
= TAKE_PTR(t
);
2527 *ret_disk_uuid
= disk_uuid
;
2532 static int ask_cb(struct fdisk_context
*c
, struct fdisk_ask
*ask
, void *userdata
) {
2537 switch (fdisk_ask_get_type(ask
)) {
2539 case FDISK_ASKTYPE_STRING
:
2540 result
= new(char, 37);
2544 fdisk_ask_string_set_result(ask
, id128_to_uuid_string(*(sd_id128_t
*) userdata
, result
));
2548 log_debug("Unexpected question from libfdisk, ignoring.");
2554 static int apply_resize_partition(int fd
, sd_id128_t disk_uuids
, struct fdisk_table
*t
) {
2555 _cleanup_(fdisk_unref_contextp
) struct fdisk_context
*c
= NULL
;
2556 _cleanup_free_
void *two_zero_lbas
= NULL
;
2557 _cleanup_free_
char *path
= NULL
;
2563 if (!t
) /* no partition table to apply, exit early */
2566 two_zero_lbas
= malloc0(1024U);
2570 /* libfdisk appears to get confused by the existing PMBR. Let's explicitly flush it out. */
2571 n
= pwrite(fd
, two_zero_lbas
, 1024U, 0);
2573 return log_error_errno(errno
, "Failed to wipe partition table: %m");
2575 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "Short write while wiping partition table.");
2577 c
= fdisk_new_context();
2581 if (asprintf(&path
, "/proc/self/fd/%i", fd
) < 0)
2584 r
= fdisk_assign_device(c
, path
, 0);
2586 return log_error_errno(r
, "Failed to open device: %m");
2588 r
= fdisk_create_disklabel(c
, "gpt");
2590 return log_error_errno(r
, "Failed to create GPT disk label: %m");
2592 r
= fdisk_apply_table(c
, t
);
2594 return log_error_errno(r
, "Failed to apply partition table: %m");
2596 r
= fdisk_set_ask(c
, ask_cb
, &disk_uuids
);
2598 return log_error_errno(r
, "Failed to set libfdisk query function: %m");
2600 r
= fdisk_set_disklabel_id(c
);
2602 return log_error_errno(r
, "Failed to change disklabel ID: %m");
2604 r
= fdisk_write_disklabel(c
);
2606 return log_error_errno(r
, "Failed to write disk label: %m");
2611 int home_resize_luks(
2613 bool already_activated
,
2614 PasswordCache
*cache
,
2616 UserRecord
**ret_home
) {
2618 char buffer1
[FORMAT_BYTES_MAX
], buffer2
[FORMAT_BYTES_MAX
], buffer3
[FORMAT_BYTES_MAX
],
2619 buffer4
[FORMAT_BYTES_MAX
], buffer5
[FORMAT_BYTES_MAX
], buffer6
[FORMAT_BYTES_MAX
];
2620 uint64_t old_image_size
, new_image_size
, old_fs_size
, new_fs_size
, crypto_offset
, new_partition_size
;
2621 _cleanup_(user_record_unrefp
) UserRecord
*header_home
= NULL
, *embedded_home
= NULL
, *new_home
= NULL
;
2622 _cleanup_(fdisk_unref_tablep
) struct fdisk_table
*table
= NULL
;
2623 _cleanup_free_
char *whole_disk
= NULL
;
2624 _cleanup_close_
int image_fd
= -1;
2625 sd_id128_t disk_uuid
;
2626 const char *ip
, *ipo
;
2632 assert(user_record_storage(h
) == USER_LUKS
);
2636 assert_se(ipo
= user_record_image_path(h
));
2637 ip
= strdupa(ipo
); /* copy out since original might change later in home record object */
2639 image_fd
= open(ip
, O_RDWR
|O_CLOEXEC
|O_NOCTTY
|O_NONBLOCK
);
2641 return log_error_errno(errno
, "Failed to open image file %s: %m", ip
);
2643 if (fstat(image_fd
, &st
) < 0)
2644 return log_error_errno(errno
, "Failed to stat image file %s: %m", ip
);
2645 if (S_ISBLK(st
.st_mode
)) {
2648 r
= block_get_whole_disk(st
.st_rdev
, &parent
);
2650 return log_error_errno(r
, "Failed to acquire whole block device for %s: %m", ip
);
2652 /* If we shall resize a file system on a partition device, then let's figure out the
2653 * whole disk device and operate on that instead, since we need to rewrite the
2654 * partition table to resize the partition. */
2656 log_info("Operating on partition device %s, using parent device.", ip
);
2658 r
= device_path_make_major_minor(st
.st_mode
, parent
, &whole_disk
);
2660 return log_error_errno(r
, "Failed to derive whole disk path for %s: %m", ip
);
2662 safe_close(image_fd
);
2664 image_fd
= open(whole_disk
, O_RDWR
|O_CLOEXEC
|O_NOCTTY
|O_NONBLOCK
);
2666 return log_error_errno(errno
, "Failed to open whole block device %s: %m", whole_disk
);
2668 if (fstat(image_fd
, &st
) < 0)
2669 return log_error_errno(errno
, "Failed to stat whole block device %s: %m", whole_disk
);
2670 if (!S_ISBLK(st
.st_mode
))
2671 return log_error_errno(SYNTHETIC_ERRNO(ENOTBLK
), "Whole block device %s is not actually a block device, refusing.", whole_disk
);
2673 log_info("Operating on whole block device %s.", ip
);
2675 if (ioctl(image_fd
, BLKGETSIZE64
, &old_image_size
) < 0)
2676 return log_error_errno(errno
, "Failed to determine size of original block device: %m");
2678 if (flock(image_fd
, LOCK_EX
) < 0) /* make sure udev doesn't read from it while we operate on the device */
2679 return log_error_errno(errno
, "Failed to lock block device %s: %m", ip
);
2681 new_image_size
= old_image_size
; /* we can't resize physical block devices */
2683 r
= stat_verify_regular(&st
);
2685 return log_error_errno(r
, "Image %s is not a block device nor regular file: %m", ip
);
2687 old_image_size
= st
.st_size
;
2689 /* Note an asymetry here: when we operate on loopback files the specified disk size we get we
2690 * apply onto the loopback file as a whole. When we operate on block devices we instead apply
2691 * to the partition itself only. */
2693 new_image_size
= DISK_SIZE_ROUND_DOWN(h
->disk_size
);
2694 if (new_image_size
== old_image_size
) {
2695 log_info("Image size already matching, skipping operation.");
2700 r
= home_prepare_luks(h
, already_activated
, whole_disk
, cache
, setup
, &header_home
);
2704 r
= home_load_embedded_identity(h
, setup
->root_fd
, header_home
, USER_RECONCILE_REQUIRE_NEWER_OR_EQUAL
, cache
, &embedded_home
, &new_home
);
2708 log_info("offset = %" PRIu64
", size = %" PRIu64
", image = %" PRIu64
, setup
->partition_offset
, setup
->partition_size
, old_image_size
);
2710 if ((UINT64_MAX
- setup
->partition_offset
) < setup
->partition_size
||
2711 setup
->partition_offset
+ setup
->partition_size
> old_image_size
)
2712 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Old partition doesn't fit in backing storage, refusing.");
2714 if (S_ISREG(st
.st_mode
)) {
2715 uint64_t partition_table_extra
;
2717 partition_table_extra
= old_image_size
- setup
->partition_size
;
2718 if (new_image_size
<= partition_table_extra
)
2719 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "New size smaller than partition table metadata.");
2721 new_partition_size
= new_image_size
- partition_table_extra
;
2723 assert(S_ISBLK(st
.st_mode
));
2725 new_partition_size
= DISK_SIZE_ROUND_DOWN(h
->disk_size
);
2726 if (new_partition_size
== setup
->partition_size
) {
2727 log_info("Partition size already matching, skipping operation.");
2732 if ((UINT64_MAX
- setup
->partition_offset
) < new_partition_size
||
2733 setup
->partition_offset
+ new_partition_size
> new_image_size
)
2734 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "New partition doesn't fit into backing storage, refusing.");
2736 crypto_offset
= crypt_get_data_offset(setup
->crypt_device
);
2737 if (setup
->partition_size
/ 512U <= crypto_offset
)
2738 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Weird, old crypto payload offset doesn't actually fit in partition size?");
2739 if (new_partition_size
/ 512U <= crypto_offset
)
2740 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "New size smaller than crypto payload offset?");
2742 old_fs_size
= (setup
->partition_size
/ 512U - crypto_offset
) * 512U;
2743 new_fs_size
= (new_partition_size
/ 512U - crypto_offset
) * 512U;
2745 /* Before we start doing anything, let's figure out if we actually can */
2746 resize_type
= can_resize_fs(setup
->root_fd
, old_fs_size
, new_fs_size
);
2747 if (resize_type
< 0)
2749 if (resize_type
== CAN_RESIZE_OFFLINE
&& already_activated
)
2750 return log_error_errno(SYNTHETIC_ERRNO(ETXTBSY
), "File systems of this type can only be resized offline, but is currently online.");
2752 log_info("Ready to resize image size %s → %s, partition size %s → %s, file system size %s → %s.",
2753 format_bytes(buffer1
, sizeof(buffer1
), old_image_size
),
2754 format_bytes(buffer2
, sizeof(buffer2
), new_image_size
),
2755 format_bytes(buffer3
, sizeof(buffer3
), setup
->partition_size
),
2756 format_bytes(buffer4
, sizeof(buffer4
), new_partition_size
),
2757 format_bytes(buffer5
, sizeof(buffer5
), old_fs_size
),
2758 format_bytes(buffer6
, sizeof(buffer6
), new_fs_size
));
2760 r
= prepare_resize_partition(
2762 setup
->partition_offset
,
2763 setup
->partition_size
,
2770 if (new_fs_size
> old_fs_size
) {
2772 if (S_ISREG(st
.st_mode
)) {
2773 /* Grow file size */
2774 r
= home_truncate(h
, image_fd
, ip
, new_image_size
);
2778 log_info("Growing of image file completed.");
2781 /* Make sure loopback device sees the new bigger size */
2782 r
= loop_device_refresh_size(setup
->loop
, UINT64_MAX
, new_partition_size
);
2784 log_debug_errno(r
, "Device is not a loopback device, not refreshing size.");
2786 return log_error_errno(r
, "Failed to refresh loopback device size: %m");
2788 log_info("Refreshing loop device size completed.");
2790 r
= apply_resize_partition(image_fd
, disk_uuid
, table
);
2794 log_info("Growing of partition completed.");
2796 if (ioctl(image_fd
, BLKRRPART
, 0) < 0)
2797 log_debug_errno(errno
, "BLKRRPART failed on block device, ignoring: %m");
2799 /* Tell LUKS about the new bigger size too */
2800 r
= crypt_resize(setup
->crypt_device
, setup
->dm_name
, new_fs_size
/ 512U);
2802 return log_error_errno(r
, "Failed to grow LUKS device: %m");
2804 log_info("LUKS device growing completed.");
2806 r
= home_store_embedded_identity(new_home
, setup
->root_fd
, h
->uid
, embedded_home
);
2810 if (S_ISREG(st
.st_mode
)) {
2811 if (user_record_luks_discard(h
))
2812 /* Before we shrink, let's trim the file system, so that we need less space on disk during the shrinking */
2813 (void) run_fitrim(setup
->root_fd
);
2815 /* If discard is off, let's ensure all backing blocks are allocated, so that our resize operation doesn't fail half-way */
2816 r
= run_fallocate(image_fd
, &st
);
2823 /* Now resize the file system */
2824 if (resize_type
== CAN_RESIZE_ONLINE
)
2825 r
= resize_fs(setup
->root_fd
, new_fs_size
, NULL
);
2827 r
= ext4_offline_resize_fs(setup
, new_fs_size
, user_record_luks_discard(h
), user_record_mount_flags(h
));
2829 return log_error_errno(r
, "Failed to resize file system: %m");
2831 log_info("File system resizing completed.");
2833 /* Immediately sync afterwards */
2834 r
= home_sync_and_statfs(setup
->root_fd
, NULL
);
2838 if (new_fs_size
< old_fs_size
) {
2840 /* Shrink the LUKS device now, matching the new file system size */
2841 r
= crypt_resize(setup
->crypt_device
, setup
->dm_name
, new_fs_size
/ 512);
2843 return log_error_errno(r
, "Failed to shrink LUKS device: %m");
2845 log_info("LUKS device shrinking completed.");
2847 if (S_ISREG(st
.st_mode
)) {
2848 /* Shrink the image file */
2849 if (ftruncate(image_fd
, new_image_size
) < 0)
2850 return log_error_errno(errno
, "Failed to shrink image file %s: %m", ip
);
2852 log_info("Shrinking of image file completed.");
2855 /* Refresh the loop devices size */
2856 r
= loop_device_refresh_size(setup
->loop
, UINT64_MAX
, new_partition_size
);
2858 log_debug_errno(r
, "Device is not a loopback device, not refreshing size.");
2860 return log_error_errno(r
, "Failed to refresh loopback device size: %m");
2862 log_info("Refreshing loop device size completed.");
2864 r
= apply_resize_partition(image_fd
, disk_uuid
, table
);
2868 log_info("Shrinking of partition completed.");
2870 if (ioctl(image_fd
, BLKRRPART
, 0) < 0)
2871 log_debug_errno(errno
, "BLKRRPART failed on block device, ignoring: %m");
2873 r
= home_store_embedded_identity(new_home
, setup
->root_fd
, h
->uid
, embedded_home
);
2878 r
= home_store_header_identity_luks(new_home
, setup
, header_home
);
2882 r
= home_extend_embedded_identity(new_home
, h
, setup
);
2886 if (user_record_luks_discard(h
))
2887 (void) run_fitrim(setup
->root_fd
);
2889 r
= home_sync_and_statfs(setup
->root_fd
, &sfs
);
2893 r
= home_setup_undo(setup
);
2897 log_info("Everything completed.");
2899 print_size_summary(new_image_size
, new_fs_size
, &sfs
);
2901 *ret_home
= TAKE_PTR(new_home
);
2905 int home_passwd_luks(
2908 PasswordCache
*cache
, /* the passwords acquired via PKCS#11/FIDO2 security tokens */
2909 char **effective_passwords
/* new passwords */) {
2911 size_t volume_key_size
, max_key_slots
, n_effective
;
2912 _cleanup_(erase_and_freep
) void *volume_key
= NULL
;
2913 struct crypt_pbkdf_type good_pbkdf
, minimal_pbkdf
;
2919 assert(user_record_storage(h
) == USER_LUKS
);
2922 type
= crypt_get_type(setup
->crypt_device
);
2924 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine crypto device type.");
2926 r
= crypt_keyslot_max(type
);
2928 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine number of key slots.");
2931 r
= crypt_get_volume_key_size(setup
->crypt_device
);
2933 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine volume key size.");
2934 volume_key_size
= (size_t) r
;
2936 volume_key
= malloc(volume_key_size
);
2941 FOREACH_POINTER(list
, cache
->pkcs11_passwords
, cache
->fido2_passwords
, h
->password
) {
2942 r
= luks_try_passwords(setup
->crypt_device
, list
, volume_key
, &volume_key_size
);
2947 return log_error_errno(SYNTHETIC_ERRNO(ENOKEY
), "Failed to unlock LUKS superblock with supplied passwords.");
2949 return log_error_errno(r
, "Failed to unlocks LUKS superblock: %m");
2951 n_effective
= strv_length(effective_passwords
);
2953 build_good_pbkdf(&good_pbkdf
, h
);
2954 build_minimal_pbkdf(&minimal_pbkdf
, h
);
2956 for (size_t i
= 0; i
< max_key_slots
; i
++) {
2957 r
= crypt_keyslot_destroy(setup
->crypt_device
, i
);
2958 if (r
< 0 && !IN_SET(r
, -ENOENT
, -EINVAL
)) /* Returns EINVAL or ENOENT if there's no key in this slot already */
2959 return log_error_errno(r
, "Failed to destroy LUKS password: %m");
2961 if (i
>= n_effective
) {
2963 log_info("Destroyed LUKS key slot %zu.", i
);
2967 if (strv_contains(cache
->pkcs11_passwords
, effective_passwords
[i
]) ||
2968 strv_contains(cache
->fido2_passwords
, effective_passwords
[i
])) {
2969 log_debug("Using minimal PBKDF for slot %zu", i
);
2970 r
= crypt_set_pbkdf_type(setup
->crypt_device
, &minimal_pbkdf
);
2972 log_debug("Using good PBKDF for slot %zu", i
);
2973 r
= crypt_set_pbkdf_type(setup
->crypt_device
, &good_pbkdf
);
2976 return log_error_errno(r
, "Failed to tweak PBKDF for slot %zu: %m", i
);
2978 r
= crypt_keyslot_add_by_volume_key(
2979 setup
->crypt_device
,
2983 effective_passwords
[i
],
2984 strlen(effective_passwords
[i
]));
2986 return log_error_errno(r
, "Failed to set up LUKS password: %m");
2988 log_info("Updated LUKS key slot %zu.", i
);
2994 int home_lock_luks(UserRecord
*h
) {
2995 _cleanup_(crypt_freep
) struct crypt_device
*cd
= NULL
;
2996 _cleanup_free_
char *dm_name
= NULL
, *dm_node
= NULL
;
2997 _cleanup_close_
int root_fd
= -1;
3003 assert_se(p
= user_record_home_directory(h
));
3004 root_fd
= open(p
, O_RDONLY
|O_CLOEXEC
|O_DIRECTORY
|O_NOFOLLOW
);
3006 return log_error_errno(errno
, "Failed to open home directory: %m");
3008 r
= make_dm_names(h
->user_name
, &dm_name
, &dm_node
);
3012 r
= crypt_init_by_name(&cd
, dm_name
);
3014 return log_error_errno(r
, "Failed to initialize cryptsetup context for %s: %m", dm_name
);
3016 log_info("Discovered used LUKS device %s.", dm_node
);
3017 cryptsetup_enable_logging(cd
);
3019 if (syncfs(root_fd
) < 0) /* Snake oil, but let's better be safe than sorry */
3020 return log_error_errno(errno
, "Failed to synchronize file system %s: %m", p
);
3022 root_fd
= safe_close(root_fd
);
3024 log_info("File system synchronized.");
3026 /* Note that we don't invoke FIFREEZE here, it appears libcryptsetup/device-mapper already does that on its own for us */
3028 r
= crypt_suspend(cd
, dm_name
);
3030 return log_error_errno(r
, "Failed to suspend cryptsetup device: %s: %m", dm_node
);
3032 log_info("LUKS device suspended.");
3036 static int luks_try_resume(
3037 struct crypt_device
*cd
,
3038 const char *dm_name
,
3047 STRV_FOREACH(pp
, password
) {
3048 r
= crypt_resume_by_passphrase(
3055 log_info("Resumed LUKS device %s.", dm_name
);
3059 log_debug_errno(r
, "Password %zu didn't work for resuming device: %m", (size_t) (pp
- password
));
3065 int home_unlock_luks(UserRecord
*h
, PasswordCache
*cache
) {
3066 _cleanup_free_
char *dm_name
= NULL
, *dm_node
= NULL
;
3067 _cleanup_(crypt_freep
) struct crypt_device
*cd
= NULL
;
3073 r
= make_dm_names(h
->user_name
, &dm_name
, &dm_node
);
3077 r
= crypt_init_by_name(&cd
, dm_name
);
3079 return log_error_errno(r
, "Failed to initialize cryptsetup context for %s: %m", dm_name
);
3081 log_info("Discovered used LUKS device %s.", dm_node
);
3082 cryptsetup_enable_logging(cd
);
3085 FOREACH_POINTER(list
, cache
->pkcs11_passwords
, cache
->fido2_passwords
, h
->password
) {
3086 r
= luks_try_resume(cd
, dm_name
, list
);
3091 return log_error_errno(r
, "No valid password for LUKS superblock.");
3093 return log_error_errno(r
, "Failed to resume LUKS superblock: %m");
3095 log_info("LUKS device resumed.");