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 4K size. Given that newer hardware generally prefers 4K sectors, let's align our
42 * partitions to that too. In the worst case we'll waste 3.5K per partition that way, but I think I can live
44 #define DISK_SIZE_ROUND_DOWN(x) ((x) & ~UINT64_C(4095))
46 /* Rounds up to the nearest 4K boundary. Returns UINT64_MAX on overflow */
47 #define DISK_SIZE_ROUND_UP(x) \
50 _x > UINT64_MAX - 4095U ? UINT64_MAX : (_x + 4095U) & ~UINT64_C(4095); \
54 int run_mark_dirty(int fd
, bool b
) {
58 /* Sets or removes the 'user.home-dirty' xattr on the specified file. We use this to detect when a
59 * home directory was not properly unmounted. */
63 r
= fd_verify_regular(fd
);
68 ret
= fsetxattr(fd
, "user.home-dirty", &x
, 1, XATTR_CREATE
);
69 if (ret
< 0 && errno
!= EEXIST
)
70 return log_debug_errno(errno
, "Could not mark home directory as dirty: %m");
75 return log_debug_errno(r
, "Failed to synchronize image before marking it clean: %m");
77 ret
= fremovexattr(fd
, "user.home-dirty");
78 if (ret
< 0 && errno
!= ENODATA
)
79 return log_debug_errno(errno
, "Could not mark home directory as clean: %m");
84 return log_debug_errno(r
, "Failed to synchronize dirty flag to disk: %m");
89 int run_mark_dirty_by_path(const char *path
, bool b
) {
90 _cleanup_close_
int fd
= -1;
94 fd
= open(path
, O_RDWR
|O_CLOEXEC
|O_NOCTTY
);
96 return log_debug_errno(errno
, "Failed to open %s to mark dirty or clean: %m", path
);
98 return run_mark_dirty(fd
, b
);
101 static int probe_file_system_by_fd(
104 sd_id128_t
*ret_uuid
) {
106 _cleanup_(blkid_free_probep
) blkid_probe b
= NULL
;
107 _cleanup_free_
char *s
= NULL
;
108 const char *fstype
= NULL
, *uuid
= NULL
;
116 b
= blkid_new_probe();
121 r
= blkid_probe_set_device(b
, fd
, 0, 0);
123 return errno
> 0 ? -errno
: -ENOMEM
;
125 (void) blkid_probe_enable_superblocks(b
, 1);
126 (void) blkid_probe_set_superblocks_flags(b
, BLKID_SUBLKS_TYPE
|BLKID_SUBLKS_UUID
);
129 r
= blkid_do_safeprobe(b
);
130 if (IN_SET(r
, -2, 1)) /* nothing found or ambiguous result */
133 return errno
> 0 ? -errno
: -EIO
;
135 (void) blkid_probe_lookup_value(b
, "TYPE", &fstype
, NULL
);
139 (void) blkid_probe_lookup_value(b
, "UUID", &uuid
, NULL
);
143 r
= sd_id128_from_string(uuid
, &id
);
151 *ret_fstype
= TAKE_PTR(s
);
157 static int probe_file_system_by_path(const char *path
, char **ret_fstype
, sd_id128_t
*ret_uuid
) {
158 _cleanup_close_
int fd
= -1;
160 fd
= open(path
, O_RDONLY
|O_CLOEXEC
|O_NOCTTY
|O_NONBLOCK
);
164 return probe_file_system_by_fd(fd
, ret_fstype
, ret_uuid
);
167 static int block_get_size_by_fd(int fd
, uint64_t *ret
) {
173 if (fstat(fd
, &st
) < 0)
176 if (!S_ISBLK(st
.st_mode
))
179 if (ioctl(fd
, BLKGETSIZE64
, ret
) < 0)
185 static int block_get_size_by_path(const char *path
, uint64_t *ret
) {
186 _cleanup_close_
int fd
= -1;
188 fd
= open(path
, O_RDONLY
|O_CLOEXEC
|O_NOCTTY
|O_NONBLOCK
);
192 return block_get_size_by_fd(fd
, ret
);
195 static int run_fsck(const char *node
, const char *fstype
) {
202 r
= fsck_exists(fstype
);
204 return log_error_errno(r
, "Failed to check if fsck for file system %s exists: %m", fstype
);
206 log_warning("No fsck for file system %s installed, ignoring.", fstype
);
210 r
= safe_fork("(fsck)",
211 FORK_RESET_SIGNALS
|FORK_RLIMIT_NOFILE_SAFE
|FORK_DEATHSIG
|FORK_LOG
|FORK_STDOUT_TO_STDERR
|FORK_CLOSE_ALL_FDS
,
217 execl("/sbin/fsck", "/sbin/fsck", "-aTl", node
, NULL
);
219 log_error_errno(errno
, "Failed to execute fsck: %m");
220 _exit(FSCK_OPERATIONAL_ERROR
);
223 exit_status
= wait_for_terminate_and_check("fsck", fsck_pid
, WAIT_LOG_ABNORMAL
);
226 if ((exit_status
& ~FSCK_ERROR_CORRECTED
) != 0) {
227 log_warning("fsck failed with exit status %i.", exit_status
);
229 if ((exit_status
& (FSCK_SYSTEM_SHOULD_REBOOT
|FSCK_ERRORS_LEFT_UNCORRECTED
)) != 0)
230 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "File system is corrupted, refusing.");
232 log_warning("Ignoring fsck error.");
235 log_info("File system check completed.");
240 static int luks_try_passwords(
241 struct crypt_device
*cd
,
244 size_t *volume_key_size
) {
251 STRV_FOREACH(pp
, passwords
) {
252 size_t vks
= *volume_key_size
;
254 r
= sym_crypt_volume_key_get(
262 *volume_key_size
= vks
;
266 log_debug_errno(r
, "Password %zu didn't work for unlocking LUKS superblock: %m", (size_t) (pp
- passwords
));
272 static int luks_setup(
277 const char *cipher_mode
,
278 uint64_t volume_key_size
,
280 const PasswordCache
*cache
,
282 struct crypt_device
**ret
,
283 sd_id128_t
*ret_found_uuid
,
284 void **ret_volume_key
,
285 size_t *ret_volume_key_size
) {
287 _cleanup_(sym_crypt_freep
) struct crypt_device
*cd
= NULL
;
288 _cleanup_(erase_and_freep
) void *vk
= NULL
;
298 r
= sym_crypt_init(&cd
, node
);
300 return log_error_errno(r
, "Failed to allocate libcryptsetup context: %m");
302 cryptsetup_enable_logging(cd
);
304 r
= sym_crypt_load(cd
, CRYPT_LUKS2
, NULL
);
306 return log_error_errno(r
, "Failed to load LUKS superblock: %m");
308 r
= sym_crypt_get_volume_key_size(cd
);
310 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine LUKS volume key size");
313 if (!sd_id128_is_null(uuid
) || ret_found_uuid
) {
316 s
= sym_crypt_get_uuid(cd
);
318 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock has no UUID.");
320 r
= sd_id128_from_string(s
, &p
);
322 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock has invalid UUID.");
324 /* Check that the UUID matches, if specified */
325 if (!sd_id128_is_null(uuid
) &&
326 !sd_id128_equal(uuid
, p
))
327 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock has wrong UUID.");
330 if (cipher
&& !streq_ptr(cipher
, sym_crypt_get_cipher(cd
)))
331 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock declares wrong cipher.");
333 if (cipher_mode
&& !streq_ptr(cipher_mode
, sym_crypt_get_cipher_mode(cd
)))
334 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock declares wrong cipher mode.");
336 if (volume_key_size
!= UINT64_MAX
&& vks
!= volume_key_size
)
337 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock declares wrong volume key size.");
344 FOREACH_POINTER(list
, cache
->pkcs11_passwords
, cache
->fido2_passwords
, passwords
) {
345 r
= luks_try_passwords(cd
, list
, vk
, &vks
);
350 return log_error_errno(r
, "No valid password for LUKS superblock.");
352 return log_error_errno(r
, "Failed to unlocks LUKS superblock: %m");
354 r
= sym_crypt_activate_by_volume_key(
358 discard
? CRYPT_ACTIVATE_ALLOW_DISCARDS
: 0);
360 return log_error_errno(r
, "Failed to unlock LUKS superblock: %m");
362 log_info("Setting up LUKS device /dev/mapper/%s completed.", dm_name
);
366 if (ret_found_uuid
) /* Return the UUID actually found if the caller wants to know */
369 *ret_volume_key
= TAKE_PTR(vk
);
370 if (ret_volume_key_size
)
371 *ret_volume_key_size
= vks
;
376 static int luks_open(
379 PasswordCache
*cache
,
380 struct crypt_device
**ret
,
381 sd_id128_t
*ret_found_uuid
,
382 void **ret_volume_key
,
383 size_t *ret_volume_key_size
) {
385 _cleanup_(sym_crypt_freep
) struct crypt_device
*cd
= NULL
;
386 _cleanup_(erase_and_freep
) void *vk
= NULL
;
395 /* Opens a LUKS device that is already set up. Re-validates the password while doing so (which also
396 * provides us with the volume key, which we want). */
398 r
= sym_crypt_init_by_name(&cd
, dm_name
);
400 return log_error_errno(r
, "Failed to initialize cryptsetup context for %s: %m", dm_name
);
402 cryptsetup_enable_logging(cd
);
404 r
= sym_crypt_load(cd
, CRYPT_LUKS2
, NULL
);
406 return log_error_errno(r
, "Failed to load LUKS superblock: %m");
408 r
= sym_crypt_get_volume_key_size(cd
);
410 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine LUKS volume key size");
413 if (ret_found_uuid
) {
416 s
= sym_crypt_get_uuid(cd
);
418 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock has no UUID.");
420 r
= sd_id128_from_string(s
, &p
);
422 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "LUKS superblock has invalid UUID.");
430 FOREACH_POINTER(list
, cache
->pkcs11_passwords
, cache
->fido2_passwords
, passwords
) {
431 r
= luks_try_passwords(cd
, list
, vk
, &vks
);
436 return log_error_errno(r
, "No valid password for LUKS superblock.");
438 return log_error_errno(r
, "Failed to unlocks LUKS superblock: %m");
440 log_info("Discovered used LUKS device /dev/mapper/%s, and validated password.", dm_name
);
442 /* This is needed so that crypt_resize() can operate correctly for pre-existing LUKS devices. We need
443 * to tell libcryptsetup the volume key explicitly, so that it is in the kernel keyring. */
444 r
= sym_crypt_activate_by_volume_key(cd
, NULL
, vk
, vks
, CRYPT_ACTIVATE_KEYRING_KEY
);
446 return log_error_errno(r
, "Failed to upload volume key again: %m");
448 log_info("Successfully re-activated LUKS device.");
455 *ret_volume_key
= TAKE_PTR(vk
);
456 if (ret_volume_key_size
)
457 *ret_volume_key_size
= vks
;
462 static int fs_validate(
466 sd_id128_t
*ret_found_uuid
) {
468 _cleanup_free_
char *fstype
= NULL
;
475 r
= probe_file_system_by_path(dm_node
, &fstype
, &u
);
477 return log_error_errno(r
, "Failed to probe file system: %m");
479 /* Limit the set of supported file systems a bit, as protection against little tested kernel file
480 * systems. Also, we only support the resize ioctls for these file systems. */
481 if (!supported_fstype(fstype
))
482 return log_error_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT
), "Image contains unsupported file system: %s", strna(fstype
));
484 if (!sd_id128_is_null(uuid
) &&
485 !sd_id128_equal(uuid
, u
))
486 return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE
), "File system has wrong UUID.");
488 log_info("Probing file system completed (found %s).", fstype
);
490 *ret_fstype
= TAKE_PTR(fstype
);
492 if (ret_found_uuid
) /* Return the UUID actually found if the caller wants to know */
498 static int make_dm_names(const char *user_name
, char **ret_dm_name
, char **ret_dm_node
) {
499 _cleanup_free_
char *name
= NULL
, *node
= NULL
;
505 name
= strjoin("home-", user_name
);
509 node
= path_join("/dev/mapper/", name
);
513 *ret_dm_name
= TAKE_PTR(name
);
514 *ret_dm_node
= TAKE_PTR(node
);
518 static int luks_validate(
521 sd_id128_t partition_uuid
,
522 sd_id128_t
*ret_partition_uuid
,
523 uint64_t *ret_offset
,
524 uint64_t *ret_size
) {
526 _cleanup_(blkid_free_probep
) blkid_probe b
= NULL
;
527 sd_id128_t found_partition_uuid
= SD_ID128_NULL
;
528 const char *fstype
= NULL
, *pttype
= NULL
;
529 blkid_loff_t offset
= 0, size
= 0;
539 b
= blkid_new_probe();
544 r
= blkid_probe_set_device(b
, fd
, 0, 0);
546 return errno
> 0 ? -errno
: -ENOMEM
;
548 (void) blkid_probe_enable_superblocks(b
, 1);
549 (void) blkid_probe_set_superblocks_flags(b
, BLKID_SUBLKS_TYPE
);
550 (void) blkid_probe_enable_partitions(b
, 1);
551 (void) blkid_probe_set_partitions_flags(b
, BLKID_PARTS_ENTRY_DETAILS
);
554 r
= blkid_do_safeprobe(b
);
555 if (IN_SET(r
, -2, 1)) /* nothing found or ambiguous result */
558 return errno
> 0 ? -errno
: -EIO
;
560 (void) blkid_probe_lookup_value(b
, "TYPE", &fstype
, NULL
);
561 if (streq_ptr(fstype
, "crypto_LUKS")) {
562 /* Directly a LUKS image */
564 *ret_size
= UINT64_MAX
; /* full disk */
565 *ret_partition_uuid
= SD_ID128_NULL
;
570 (void) blkid_probe_lookup_value(b
, "PTTYPE", &pttype
, NULL
);
571 if (!streq_ptr(pttype
, "gpt"))
575 pl
= blkid_probe_get_partitions(b
);
577 return errno
> 0 ? -errno
: -ENOMEM
;
580 n
= blkid_partlist_numof_partitions(pl
);
582 return errno
> 0 ? -errno
: -EIO
;
584 for (int i
= 0; i
< n
; i
++) {
586 sd_id128_t id
= SD_ID128_NULL
;
590 pp
= blkid_partlist_get_partition(pl
, i
);
592 return errno
> 0 ? -errno
: -EIO
;
594 if (!streq_ptr(blkid_partition_get_type_string(pp
), "773f91ef-66d4-49b5-bd83-d683bf40ad16"))
597 if (!streq_ptr(blkid_partition_get_name(pp
), label
))
600 sid
= blkid_partition_get_uuid(pp
);
602 r
= sd_id128_from_string(sid
, &id
);
604 log_debug_errno(r
, "Couldn't parse partition UUID %s, weird: %m", sid
);
606 if (!sd_id128_is_null(partition_uuid
) && !sd_id128_equal(id
, partition_uuid
))
613 offset
= blkid_partition_get_start(pp
);
614 size
= blkid_partition_get_size(pp
);
615 found_partition_uuid
= id
;
625 if ((uint64_t) offset
> UINT64_MAX
/ 512U)
629 if ((uint64_t) size
> UINT64_MAX
/ 512U)
632 *ret_offset
= offset
* 512U;
633 *ret_size
= size
* 512U;
634 *ret_partition_uuid
= found_partition_uuid
;
639 static int crypt_device_to_evp_cipher(struct crypt_device
*cd
, const EVP_CIPHER
**ret
) {
640 _cleanup_free_
char *cipher_name
= NULL
;
641 const char *cipher
, *cipher_mode
, *e
;
642 size_t key_size
, key_bits
;
643 const EVP_CIPHER
*cc
;
648 /* Let's find the right OpenSSL EVP_CIPHER object that matches the encryption settings of the LUKS
651 cipher
= sym_crypt_get_cipher(cd
);
653 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Cannot get cipher from LUKS device.");
655 cipher_mode
= sym_crypt_get_cipher_mode(cd
);
657 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Cannot get cipher mode from LUKS device.");
659 e
= strchr(cipher_mode
, '-');
661 cipher_mode
= strndupa(cipher_mode
, e
- cipher_mode
);
663 r
= sym_crypt_get_volume_key_size(cd
);
665 return log_error_errno(r
< 0 ? r
: SYNTHETIC_ERRNO(EINVAL
), "Cannot get volume key size from LUKS device.");
668 key_bits
= key_size
* 8;
669 if (streq(cipher_mode
, "xts"))
672 if (asprintf(&cipher_name
, "%s-%zu-%s", cipher
, key_bits
, cipher_mode
) < 0)
675 cc
= EVP_get_cipherbyname(cipher_name
);
677 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP
), "Selected cipher mode '%s' not supported, can't encrypt JSON record.", cipher_name
);
679 /* Verify that our key length calculations match what OpenSSL thinks */
680 r
= EVP_CIPHER_key_length(cc
);
681 if (r
< 0 || (uint64_t) r
!= key_size
)
682 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Key size of selected cipher doesn't meet our expectations.");
688 static int luks_validate_home_record(
689 struct crypt_device
*cd
,
691 const void *volume_key
,
692 PasswordCache
*cache
,
693 UserRecord
**ret_luks_home_record
) {
700 for (int token
= 0;; token
++) {
701 _cleanup_(json_variant_unrefp
) JsonVariant
*v
= NULL
, *rr
= NULL
;
702 _cleanup_(EVP_CIPHER_CTX_freep
) EVP_CIPHER_CTX
*context
= NULL
;
703 _cleanup_(user_record_unrefp
) UserRecord
*lhr
= NULL
;
704 _cleanup_free_
void *encrypted
= NULL
, *iv
= NULL
;
705 size_t decrypted_size
, encrypted_size
, iv_size
;
706 int decrypted_size_out1
, decrypted_size_out2
;
707 _cleanup_free_
char *decrypted
= NULL
;
708 const char *text
, *type
;
709 crypt_token_info state
;
710 JsonVariant
*jr
, *jiv
;
711 unsigned line
, column
;
712 const EVP_CIPHER
*cc
;
714 state
= sym_crypt_token_status(cd
, token
, &type
);
715 if (state
== CRYPT_TOKEN_INACTIVE
) /* First unconfigured token, give up */
717 if (IN_SET(state
, CRYPT_TOKEN_INTERNAL
, CRYPT_TOKEN_INTERNAL_UNKNOWN
, CRYPT_TOKEN_EXTERNAL
))
719 if (state
!= CRYPT_TOKEN_EXTERNAL_UNKNOWN
)
720 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Unexpected token state of token %i: %i", token
, (int) state
);
722 if (!streq(type
, "systemd-homed"))
725 r
= sym_crypt_token_json_get(cd
, token
, &text
);
727 return log_error_errno(r
, "Failed to read LUKS token %i: %m", token
);
729 r
= json_parse(text
, JSON_PARSE_SENSITIVE
, &v
, &line
, &column
);
731 return log_error_errno(r
, "Failed to parse LUKS token JSON data %u:%u: %m", line
, column
);
733 jr
= json_variant_by_key(v
, "record");
735 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "LUKS token lacks 'record' field.");
736 jiv
= json_variant_by_key(v
, "iv");
738 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "LUKS token lacks 'iv' field.");
740 r
= json_variant_unbase64(jr
, &encrypted
, &encrypted_size
);
742 return log_error_errno(r
, "Failed to base64 decode record: %m");
744 r
= json_variant_unbase64(jiv
, &iv
, &iv_size
);
746 return log_error_errno(r
, "Failed to base64 decode IV: %m");
748 r
= crypt_device_to_evp_cipher(cd
, &cc
);
751 if (iv_size
> INT_MAX
|| EVP_CIPHER_iv_length(cc
) != (int) iv_size
)
752 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "IV size doesn't match.");
754 context
= EVP_CIPHER_CTX_new();
758 if (EVP_DecryptInit_ex(context
, cc
, NULL
, volume_key
, iv
) != 1)
759 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to initialize decryption context.");
761 decrypted_size
= encrypted_size
+ EVP_CIPHER_key_length(cc
) * 2;
762 decrypted
= new(char, decrypted_size
);
766 if (EVP_DecryptUpdate(context
, (uint8_t*) decrypted
, &decrypted_size_out1
, encrypted
, encrypted_size
) != 1)
767 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to decrypt JSON record.");
769 assert((size_t) decrypted_size_out1
<= decrypted_size
);
771 if (EVP_DecryptFinal_ex(context
, (uint8_t*) decrypted
+ decrypted_size_out1
, &decrypted_size_out2
) != 1)
772 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to finish decryption of JSON record.");
774 assert((size_t) decrypted_size_out1
+ (size_t) decrypted_size_out2
< decrypted_size
);
775 decrypted_size
= (size_t) decrypted_size_out1
+ (size_t) decrypted_size_out2
;
777 if (memchr(decrypted
, 0, decrypted_size
))
778 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Inner NUL byte in JSON record, refusing.");
780 decrypted
[decrypted_size
] = 0;
782 r
= json_parse(decrypted
, JSON_PARSE_SENSITIVE
, &rr
, NULL
, NULL
);
784 return log_error_errno(r
, "Failed to parse decrypted JSON record, refusing.");
786 lhr
= user_record_new();
790 r
= user_record_load(lhr
, rr
, USER_RECORD_LOAD_EMBEDDED
|USER_RECORD_PERMISSIVE
);
792 return log_error_errno(r
, "Failed to parse user record: %m");
794 if (!user_record_compatible(h
, lhr
))
795 return log_error_errno(SYNTHETIC_ERRNO(EREMCHG
), "LUKS home record not compatible with host record, refusing.");
797 r
= user_record_authenticate(lhr
, h
, cache
, /* strict_verify= */ true);
800 assert(r
> 0); /* Insist that a password was verified */
802 *ret_luks_home_record
= TAKE_PTR(lhr
);
806 return log_error_errno(SYNTHETIC_ERRNO(EBADMSG
), "Couldn't find home record in LUKS2 header, refusing.");
809 static int format_luks_token_text(
810 struct crypt_device
*cd
,
812 const void *volume_key
,
815 int r
, encrypted_size_out1
= 0, encrypted_size_out2
= 0, iv_size
, key_size
;
816 _cleanup_(EVP_CIPHER_CTX_freep
) EVP_CIPHER_CTX
*context
= NULL
;
817 _cleanup_(json_variant_unrefp
) JsonVariant
*v
= NULL
;
818 _cleanup_free_
void *iv
= NULL
, *encrypted
= NULL
;
819 size_t text_length
, encrypted_size
;
820 _cleanup_free_
char *text
= NULL
;
821 const EVP_CIPHER
*cc
;
828 r
= crypt_device_to_evp_cipher(cd
, &cc
);
832 key_size
= EVP_CIPHER_key_length(cc
);
833 iv_size
= EVP_CIPHER_iv_length(cc
);
836 iv
= malloc(iv_size
);
840 r
= genuine_random_bytes(iv
, iv_size
, RANDOM_BLOCK
);
842 return log_error_errno(r
, "Failed to generate IV: %m");
845 context
= EVP_CIPHER_CTX_new();
849 if (EVP_EncryptInit_ex(context
, cc
, NULL
, volume_key
, iv
) != 1)
850 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to initialize encryption context.");
852 r
= json_variant_format(hr
->json
, 0, &text
);
854 return log_error_errno(r
, "Failed to format user record for LUKS: %m");
856 text_length
= strlen(text
);
857 encrypted_size
= text_length
+ 2*key_size
- 1;
859 encrypted
= malloc(encrypted_size
);
863 if (EVP_EncryptUpdate(context
, encrypted
, &encrypted_size_out1
, (uint8_t*) text
, text_length
) != 1)
864 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to encrypt JSON record.");
866 assert((size_t) encrypted_size_out1
<= encrypted_size
);
868 if (EVP_EncryptFinal_ex(context
, (uint8_t*) encrypted
+ encrypted_size_out1
, &encrypted_size_out2
) != 1)
869 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to finish encryption of JSON record. ");
871 assert((size_t) encrypted_size_out1
+ (size_t) encrypted_size_out2
<= encrypted_size
);
875 JSON_BUILD_PAIR("type", JSON_BUILD_STRING("systemd-homed")),
876 JSON_BUILD_PAIR("keyslots", JSON_BUILD_EMPTY_ARRAY
),
877 JSON_BUILD_PAIR("record", JSON_BUILD_BASE64(encrypted
, encrypted_size_out1
+ encrypted_size_out2
)),
878 JSON_BUILD_PAIR("iv", JSON_BUILD_BASE64(iv
, iv_size
))));
880 return log_error_errno(r
, "Failed to prepare LUKS JSON token object: %m");
882 r
= json_variant_format(v
, 0, ret
);
884 return log_error_errno(r
, "Failed to format encrypted user record for LUKS: %m");
889 int home_store_header_identity_luks(
892 UserRecord
*old_home
) {
894 _cleanup_(user_record_unrefp
) UserRecord
*header_home
= NULL
;
895 _cleanup_free_
char *text
= NULL
;
900 if (!setup
->crypt_device
)
903 assert(setup
->volume_key
);
905 /* Let's store the user's identity record in the LUKS2 "token" header data fields, in an encrypted
906 * fashion. Why that? If we'd rely on the record being embedded in the payload file system itself we
907 * would have to mount the file system before we can validate the JSON record, its signatures and
908 * whether it matches what we are looking for. However, kernel file system implementations are
909 * generally not ready to be used on untrusted media. Hence let's store the record independently of
910 * the file system, so that we can validate it first, and only then mount the file system. To keep
911 * things simple we use the same encryption settings for this record as for the file system itself. */
913 r
= user_record_clone(h
, USER_RECORD_EXTRACT_EMBEDDED
|USER_RECORD_PERMISSIVE
, &header_home
);
915 return log_error_errno(r
, "Failed to determine new header record: %m");
917 if (old_home
&& user_record_equal(old_home
, header_home
)) {
918 log_debug("Not updating header home record.");
922 r
= format_luks_token_text(setup
->crypt_device
, header_home
, setup
->volume_key
, &text
);
927 crypt_token_info state
;
930 state
= sym_crypt_token_status(setup
->crypt_device
, token
, &type
);
931 if (state
== CRYPT_TOKEN_INACTIVE
) /* First unconfigured token, we are done */
933 if (IN_SET(state
, CRYPT_TOKEN_INTERNAL
, CRYPT_TOKEN_INTERNAL_UNKNOWN
, CRYPT_TOKEN_EXTERNAL
))
934 continue; /* Not ours */
935 if (state
!= CRYPT_TOKEN_EXTERNAL_UNKNOWN
)
936 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Unexpected token state of token %i: %i", token
, (int) state
);
938 if (!streq(type
, "systemd-homed"))
941 r
= sym_crypt_token_json_set(setup
->crypt_device
, token
, text
);
943 return log_error_errno(r
, "Failed to set JSON token for slot %i: %m", token
);
945 /* Now, let's free the text so that for all further matching tokens we all crypt_json_token_set()
946 * with a NULL text in order to invalidate the tokens. */
952 return log_error_errno(SYNTHETIC_ERRNO(EBADMSG
), "Didn't find any record token to update.");
954 log_info("Wrote LUKS header user record.");
959 int run_fitrim(int root_fd
) {
960 struct fstrim_range range
= {
964 /* If discarding is on, discard everything right after mounting, so that the discard setting takes
965 * effect on activation. (Also, optionally, trim on logout) */
967 assert(root_fd
>= 0);
969 if (ioctl(root_fd
, FITRIM
, &range
) < 0) {
970 if (ERRNO_IS_NOT_SUPPORTED(errno
) || errno
== EBADF
) {
971 log_debug_errno(errno
, "File system does not support FITRIM, not trimming.");
975 return log_warning_errno(errno
, "Failed to invoke FITRIM, ignoring: %m");
978 log_info("Discarded unused %s.", FORMAT_BYTES(range
.len
));
982 int run_fitrim_by_path(const char *root_path
) {
983 _cleanup_close_
int root_fd
= -1;
985 root_fd
= open(root_path
, O_RDONLY
|O_DIRECTORY
|O_CLOEXEC
);
987 return log_error_errno(errno
, "Failed to open file system '%s' for trimming: %m", root_path
);
989 return run_fitrim(root_fd
);
992 int run_fallocate(int backing_fd
, const struct stat
*st
) {
995 assert(backing_fd
>= 0);
997 /* If discarding is off, let's allocate the whole image before mounting, so that the setting takes
998 * effect on activation */
1001 if (fstat(backing_fd
, &stbuf
) < 0)
1002 return log_error_errno(errno
, "Failed to fstat(): %m");
1007 if (!S_ISREG(st
->st_mode
))
1010 if (st
->st_blocks
>= DIV_ROUND_UP(st
->st_size
, 512)) {
1011 log_info("Backing file is fully allocated already.");
1015 if (fallocate(backing_fd
, FALLOC_FL_KEEP_SIZE
, 0, st
->st_size
) < 0) {
1017 if (ERRNO_IS_NOT_SUPPORTED(errno
)) {
1018 log_debug_errno(errno
, "fallocate() not supported on file system, ignoring.");
1022 if (ERRNO_IS_DISK_SPACE(errno
)) {
1023 log_debug_errno(errno
, "Not enough disk space to fully allocate home.");
1024 return -ENOSPC
; /* make recognizable */
1027 return log_error_errno(errno
, "Failed to allocate backing file blocks: %m");
1030 log_info("Allocated additional %s.",
1031 FORMAT_BYTES((DIV_ROUND_UP(st
->st_size
, 512) - st
->st_blocks
) * 512));
1035 int run_fallocate_by_path(const char *backing_path
) {
1036 _cleanup_close_
int backing_fd
= -1;
1038 backing_fd
= open(backing_path
, O_RDWR
|O_CLOEXEC
|O_NOCTTY
|O_NONBLOCK
);
1040 return log_error_errno(errno
, "Failed to open '%s' for fallocate(): %m", backing_path
);
1042 return run_fallocate(backing_fd
, NULL
);
1045 int home_prepare_luks(
1047 bool already_activated
,
1048 const char *force_image_path
,
1049 PasswordCache
*cache
,
1051 UserRecord
**ret_luks_home
) {
1053 sd_id128_t found_partition_uuid
, found_luks_uuid
, found_fs_uuid
;
1054 _cleanup_(user_record_unrefp
) UserRecord
*luks_home
= NULL
;
1055 _cleanup_(loop_device_unrefp
) LoopDevice
*loop
= NULL
;
1056 _cleanup_(sym_crypt_freep
) struct crypt_device
*cd
= NULL
;
1057 _cleanup_(erase_and_freep
) void *volume_key
= NULL
;
1058 _cleanup_close_
int root_fd
= -1, image_fd
= -1;
1059 bool dm_activated
= false, mounted
= false;
1060 size_t volume_key_size
= 0;
1061 bool marked_dirty
= false;
1062 uint64_t offset
, size
;
1067 assert(setup
->dm_name
);
1068 assert(setup
->dm_node
);
1070 assert(user_record_storage(h
) == USER_LUKS
);
1072 r
= dlopen_cryptsetup();
1076 if (already_activated
) {
1077 struct loop_info64 info
;
1080 r
= luks_open(setup
->dm_name
,
1090 r
= luks_validate_home_record(cd
, h
, volume_key
, cache
, &luks_home
);
1094 n
= sym_crypt_get_device_name(cd
);
1096 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine backing device for DM %s.", setup
->dm_name
);
1098 r
= loop_device_open(n
, O_RDWR
, &loop
);
1100 return log_error_errno(r
, "Failed to open loopback device %s: %m", n
);
1102 if (ioctl(loop
->fd
, LOOP_GET_STATUS64
, &info
) < 0) {
1103 _cleanup_free_
char *sysfs
= NULL
;
1106 if (!IN_SET(errno
, ENOTTY
, EINVAL
))
1107 return log_error_errno(errno
, "Failed to get block device metrics of %s: %m", n
);
1109 if (ioctl(loop
->fd
, BLKGETSIZE64
, &size
) < 0)
1110 return log_error_errno(r
, "Failed to read block device size of %s: %m", n
);
1112 if (fstat(loop
->fd
, &st
) < 0)
1113 return log_error_errno(r
, "Failed to stat block device %s: %m", n
);
1114 assert(S_ISBLK(st
.st_mode
));
1116 if (asprintf(&sysfs
, "/sys/dev/block/%u:%u/partition", major(st
.st_rdev
), minor(st
.st_rdev
)) < 0)
1119 if (access(sysfs
, F_OK
) < 0) {
1120 if (errno
!= ENOENT
)
1121 return log_error_errno(errno
, "Failed to determine whether %s exists: %m", sysfs
);
1125 _cleanup_free_
char *buffer
= NULL
;
1127 if (asprintf(&sysfs
, "/sys/dev/block/%u:%u/start", major(st
.st_rdev
), minor(st
.st_rdev
)) < 0)
1130 r
= read_one_line_file(sysfs
, &buffer
);
1132 return log_error_errno(r
, "Failed to read partition start offset: %m");
1134 r
= safe_atou64(buffer
, &offset
);
1136 return log_error_errno(r
, "Failed to parse partition start offset: %m");
1138 if (offset
> UINT64_MAX
/ 512U)
1139 return log_error_errno(SYNTHETIC_ERRNO(E2BIG
), "Offset too large for 64 byte range, refusing.");
1144 offset
= info
.lo_offset
;
1145 size
= info
.lo_sizelimit
;
1148 found_partition_uuid
= found_fs_uuid
= SD_ID128_NULL
;
1150 log_info("Discovered used loopback device %s.", loop
->node
);
1152 root_fd
= open(user_record_home_directory(h
), O_RDONLY
|O_CLOEXEC
|O_DIRECTORY
|O_NOFOLLOW
);
1154 r
= log_error_errno(r
, "Failed to open home directory: %m");
1158 _cleanup_free_
char *fstype
= NULL
, *subdir
= NULL
;
1162 ip
= force_image_path
?: user_record_image_path(h
);
1164 subdir
= path_join("/run/systemd/user-home-mount/", user_record_user_name_and_realm(h
));
1168 image_fd
= open(ip
, O_RDWR
|O_CLOEXEC
|O_NOCTTY
|O_NONBLOCK
);
1170 return log_error_errno(errno
, "Failed to open image file %s: %m", ip
);
1172 if (fstat(image_fd
, &st
) < 0)
1173 return log_error_errno(errno
, "Failed to fstat() image file: %m");
1174 if (!S_ISREG(st
.st_mode
) && !S_ISBLK(st
.st_mode
))
1175 return log_error_errno(
1176 S_ISDIR(st
.st_mode
) ? SYNTHETIC_ERRNO(EISDIR
) : SYNTHETIC_ERRNO(EBADFD
),
1177 "Image file %s is not a regular file or block device: %m", ip
);
1179 r
= luks_validate(image_fd
, user_record_user_name_and_realm(h
), h
->partition_uuid
, &found_partition_uuid
, &offset
, &size
);
1181 return log_error_errno(r
, "Failed to validate disk label: %m");
1183 /* Everything before this point left the image untouched. We are now starting to make
1184 * changes, hence mark the image dirty */
1185 marked_dirty
= run_mark_dirty(image_fd
, true) > 0;
1187 if (!user_record_luks_discard(h
)) {
1188 r
= run_fallocate(image_fd
, &st
);
1193 r
= loop_device_make(image_fd
, O_RDWR
, offset
, size
, 0, &loop
);
1195 log_error_errno(r
, "Loopback block device support is not available on this system.");
1196 return -ENOLINK
; /* make recognizable */
1199 return log_error_errno(r
, "Failed to allocate loopback context: %m");
1201 log_info("Setting up loopback device %s completed.", loop
->node
?: ip
);
1203 r
= luks_setup(loop
->node
?: ip
,
1207 h
->luks_cipher_mode
,
1208 h
->luks_volume_key_size
,
1211 user_record_luks_discard(h
) || user_record_luks_offline_discard(h
),
1219 dm_activated
= true;
1221 r
= luks_validate_home_record(cd
, h
, volume_key
, cache
, &luks_home
);
1225 r
= fs_validate(setup
->dm_node
, h
->file_system_uuid
, &fstype
, &found_fs_uuid
);
1229 r
= run_fsck(setup
->dm_node
, fstype
);
1233 r
= home_unshare_and_mount(setup
->dm_node
, fstype
, user_record_luks_discard(h
), user_record_mount_flags(h
));
1239 root_fd
= open(subdir
, O_RDONLY
|O_CLOEXEC
|O_DIRECTORY
|O_NOFOLLOW
);
1241 r
= log_error_errno(r
, "Failed to open home directory: %m");
1245 if (user_record_luks_discard(h
))
1246 (void) run_fitrim(root_fd
);
1248 setup
->image_fd
= TAKE_FD(image_fd
);
1249 setup
->do_offline_fallocate
= !(setup
->do_offline_fitrim
= user_record_luks_offline_discard(h
));
1250 setup
->do_mark_clean
= marked_dirty
;
1253 setup
->loop
= TAKE_PTR(loop
);
1254 setup
->crypt_device
= TAKE_PTR(cd
);
1255 setup
->root_fd
= TAKE_FD(root_fd
);
1256 setup
->found_partition_uuid
= found_partition_uuid
;
1257 setup
->found_luks_uuid
= found_luks_uuid
;
1258 setup
->found_fs_uuid
= found_fs_uuid
;
1259 setup
->partition_offset
= offset
;
1260 setup
->partition_size
= size
;
1261 setup
->volume_key
= TAKE_PTR(volume_key
);
1262 setup
->volume_key_size
= volume_key_size
;
1264 setup
->undo_mount
= mounted
;
1265 setup
->undo_dm
= dm_activated
;
1268 *ret_luks_home
= TAKE_PTR(luks_home
);
1274 (void) umount_verbose(LOG_ERR
, "/run/systemd/user-home-mount", UMOUNT_NOFOLLOW
);
1277 (void) sym_crypt_deactivate_by_name(cd
, setup
->dm_name
, 0);
1279 if (image_fd
>= 0 && marked_dirty
)
1280 (void) run_mark_dirty(image_fd
, false);
1285 static void print_size_summary(uint64_t host_size
, uint64_t encrypted_size
, struct statfs
*sfs
) {
1288 log_info("Image size is %s, file system size is %s, file system payload size is %s, file system free is %s.",
1289 FORMAT_BYTES(host_size
),
1290 FORMAT_BYTES(encrypted_size
),
1291 FORMAT_BYTES((uint64_t) sfs
->f_blocks
* (uint64_t) sfs
->f_frsize
),
1292 FORMAT_BYTES((uint64_t) sfs
->f_bfree
* (uint64_t) sfs
->f_frsize
));
1295 int home_activate_luks(
1297 PasswordCache
*cache
,
1298 UserRecord
**ret_home
) {
1300 _cleanup_(user_record_unrefp
) UserRecord
*new_home
= NULL
, *luks_home_record
= NULL
;
1301 _cleanup_(home_setup_undo
) HomeSetup setup
= HOME_SETUP_INIT
;
1302 uint64_t host_size
, encrypted_size
;
1303 const char *hdo
, *hd
;
1308 assert(user_record_storage(h
) == USER_LUKS
);
1311 r
= dlopen_cryptsetup();
1315 assert_se(hdo
= user_record_home_directory(h
));
1316 hd
= strdupa(hdo
); /* copy the string out, since it might change later in the home record object */
1318 r
= make_dm_names(h
->user_name
, &setup
.dm_name
, &setup
.dm_node
);
1322 r
= access(setup
.dm_node
, F_OK
);
1324 if (errno
!= ENOENT
)
1325 return log_error_errno(errno
, "Failed to determine whether %s exists: %m", setup
.dm_node
);
1327 return log_error_errno(SYNTHETIC_ERRNO(EEXIST
), "Device mapper device %s already exists, refusing.", setup
.dm_node
);
1329 r
= home_prepare_luks(
1339 r
= block_get_size_by_fd(setup
.loop
->fd
, &host_size
);
1341 return log_error_errno(r
, "Failed to get loopback block device size: %m");
1343 r
= block_get_size_by_path(setup
.dm_node
, &encrypted_size
);
1345 return log_error_errno(r
, "Failed to get LUKS block device size: %m");
1357 r
= home_extend_embedded_identity(new_home
, h
, &setup
);
1361 setup
.root_fd
= safe_close(setup
.root_fd
);
1363 r
= home_move_mount(user_record_user_name_and_realm(h
), hd
);
1367 setup
.undo_mount
= false;
1368 setup
.do_offline_fitrim
= false;
1370 loop_device_relinquish(setup
.loop
);
1372 r
= sym_crypt_deactivate_by_name(NULL
, setup
.dm_name
, CRYPT_DEACTIVATE_DEFERRED
);
1374 log_warning_errno(r
, "Failed to relinquish DM device, ignoring: %m");
1376 setup
.undo_dm
= false;
1377 setup
.do_offline_fallocate
= false;
1378 setup
.do_mark_clean
= false;
1380 log_info("Everything completed.");
1382 print_size_summary(host_size
, encrypted_size
, &sfs
);
1384 *ret_home
= TAKE_PTR(new_home
);
1388 int home_deactivate_luks(UserRecord
*h
) {
1389 _cleanup_(sym_crypt_freep
) struct crypt_device
*cd
= NULL
;
1390 _cleanup_free_
char *dm_name
= NULL
, *dm_node
= NULL
;
1394 /* Note that the DM device and loopback device are set to auto-detach, hence strictly speaking we
1395 * don't have to explicitly have to detach them. However, we do that nonetheless (in case of the DM
1396 * device), to avoid races: by explicitly detaching them we know when the detaching is complete. We
1397 * don't bother about the loopback device because unlike the DM device it doesn't have a fixed
1400 r
= dlopen_cryptsetup();
1404 r
= make_dm_names(h
->user_name
, &dm_name
, &dm_node
);
1408 r
= sym_crypt_init_by_name(&cd
, dm_name
);
1409 if (IN_SET(r
, -ENODEV
, -EINVAL
, -ENOENT
)) {
1410 log_debug_errno(r
, "LUKS device %s has already been detached.", dm_name
);
1411 we_detached
= false;
1413 return log_error_errno(r
, "Failed to initialize cryptsetup context for %s: %m", dm_name
);
1415 log_info("Discovered used LUKS device %s.", dm_node
);
1417 cryptsetup_enable_logging(cd
);
1419 r
= sym_crypt_deactivate_by_name(cd
, dm_name
, 0);
1420 if (IN_SET(r
, -ENODEV
, -EINVAL
, -ENOENT
)) {
1421 log_debug_errno(r
, "LUKS device %s is already detached.", dm_node
);
1422 we_detached
= false;
1424 return log_info_errno(r
, "LUKS device %s couldn't be deactivated: %m", dm_node
);
1426 log_info("LUKS device detaching completed.");
1431 if (user_record_luks_offline_discard(h
))
1432 log_debug("Not allocating on logout.");
1434 (void) run_fallocate_by_path(user_record_image_path(h
));
1436 run_mark_dirty_by_path(user_record_image_path(h
), false);
1440 int home_trim_luks(UserRecord
*h
) {
1443 if (!user_record_luks_offline_discard(h
)) {
1444 log_debug("Not trimming on logout.");
1448 (void) run_fitrim_by_path(user_record_home_directory(h
));
1452 static struct crypt_pbkdf_type
* build_good_pbkdf(struct crypt_pbkdf_type
*buffer
, UserRecord
*hr
) {
1456 *buffer
= (struct crypt_pbkdf_type
) {
1457 .hash
= user_record_luks_pbkdf_hash_algorithm(hr
),
1458 .type
= user_record_luks_pbkdf_type(hr
),
1459 .time_ms
= user_record_luks_pbkdf_time_cost_usec(hr
) / USEC_PER_MSEC
,
1460 .max_memory_kb
= user_record_luks_pbkdf_memory_cost(hr
) / 1024,
1461 .parallel_threads
= user_record_luks_pbkdf_parallel_threads(hr
),
1467 static struct crypt_pbkdf_type
* build_minimal_pbkdf(struct crypt_pbkdf_type
*buffer
, UserRecord
*hr
) {
1471 /* For PKCS#11 derived keys (which are generated randomly and are of high quality already) we use a
1473 *buffer
= (struct crypt_pbkdf_type
) {
1474 .hash
= user_record_luks_pbkdf_hash_algorithm(hr
),
1475 .type
= CRYPT_KDF_PBKDF2
,
1483 static int luks_format(
1485 const char *dm_name
,
1488 const PasswordCache
*cache
,
1489 char **effective_passwords
,
1492 struct crypt_device
**ret
) {
1494 _cleanup_(user_record_unrefp
) UserRecord
*reduced
= NULL
;
1495 _cleanup_(sym_crypt_freep
) struct crypt_device
*cd
= NULL
;
1496 _cleanup_(erase_and_freep
) void *volume_key
= NULL
;
1497 struct crypt_pbkdf_type good_pbkdf
, minimal_pbkdf
;
1498 _cleanup_free_
char *text
= NULL
;
1499 size_t volume_key_size
;
1508 r
= sym_crypt_init(&cd
, node
);
1510 return log_error_errno(r
, "Failed to allocate libcryptsetup context: %m");
1512 cryptsetup_enable_logging(cd
);
1514 /* Normally we'd, just leave volume key generation to libcryptsetup. However, we can't, since we
1515 * can't extract the volume key from the library again, but we need it in order to encrypt the JSON
1516 * record. Hence, let's generate it on our own, so that we can keep track of it. */
1518 volume_key_size
= user_record_luks_volume_key_size(hr
);
1519 volume_key
= malloc(volume_key_size
);
1523 r
= genuine_random_bytes(volume_key
, volume_key_size
, RANDOM_BLOCK
);
1525 return log_error_errno(r
, "Failed to generate volume key: %m");
1527 #if HAVE_CRYPT_SET_METADATA_SIZE
1528 /* Increase the metadata space to 4M, the largest LUKS2 supports */
1529 r
= sym_crypt_set_metadata_size(cd
, 4096U*1024U, 0);
1531 return log_error_errno(r
, "Failed to change LUKS2 metadata size: %m");
1534 build_good_pbkdf(&good_pbkdf
, hr
);
1535 build_minimal_pbkdf(&minimal_pbkdf
, hr
);
1537 r
= sym_crypt_format(
1540 user_record_luks_cipher(hr
),
1541 user_record_luks_cipher_mode(hr
),
1542 ID128_TO_UUID_STRING(uuid
),
1545 &(struct crypt_params_luks2
) {
1547 .subsystem
= "systemd-home",
1548 .sector_size
= 512U,
1549 .pbkdf
= &good_pbkdf
,
1552 return log_error_errno(r
, "Failed to format LUKS image: %m");
1554 log_info("LUKS formatting completed.");
1556 STRV_FOREACH(pp
, effective_passwords
) {
1558 if (strv_contains(cache
->pkcs11_passwords
, *pp
) ||
1559 strv_contains(cache
->fido2_passwords
, *pp
)) {
1560 log_debug("Using minimal PBKDF for slot %i", slot
);
1561 r
= sym_crypt_set_pbkdf_type(cd
, &minimal_pbkdf
);
1563 log_debug("Using good PBKDF for slot %i", slot
);
1564 r
= sym_crypt_set_pbkdf_type(cd
, &good_pbkdf
);
1567 return log_error_errno(r
, "Failed to tweak PBKDF for slot %i: %m", slot
);
1569 r
= sym_crypt_keyslot_add_by_volume_key(
1577 return log_error_errno(r
, "Failed to set up LUKS password for slot %i: %m", slot
);
1579 log_info("Writing password to LUKS keyslot %i completed.", slot
);
1583 r
= sym_crypt_activate_by_volume_key(
1588 discard
? CRYPT_ACTIVATE_ALLOW_DISCARDS
: 0);
1590 return log_error_errno(r
, "Failed to activate LUKS superblock: %m");
1592 log_info("LUKS activation by volume key succeeded.");
1594 r
= user_record_clone(hr
, USER_RECORD_EXTRACT_EMBEDDED
|USER_RECORD_PERMISSIVE
, &reduced
);
1596 return log_error_errno(r
, "Failed to prepare home record for LUKS: %m");
1598 r
= format_luks_token_text(cd
, reduced
, volume_key
, &text
);
1602 r
= sym_crypt_token_json_set(cd
, CRYPT_ANY_TOKEN
, text
);
1604 return log_error_errno(r
, "Failed to set LUKS JSON token: %m");
1606 log_info("Writing user record as LUKS token completed.");
1609 *ret
= TAKE_PTR(cd
);
1614 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(struct fdisk_context
*, fdisk_unref_context
, NULL
);
1615 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(struct fdisk_partition
*, fdisk_unref_partition
, NULL
);
1616 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(struct fdisk_parttype
*, fdisk_unref_parttype
, NULL
);
1617 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(struct fdisk_table
*, fdisk_unref_table
, NULL
);
1619 static int make_partition_table(
1623 uint64_t *ret_offset
,
1625 sd_id128_t
*ret_disk_uuid
) {
1627 _cleanup_(fdisk_unref_partitionp
) struct fdisk_partition
*p
= NULL
, *q
= NULL
;
1628 _cleanup_(fdisk_unref_parttypep
) struct fdisk_parttype
*t
= NULL
;
1629 _cleanup_(fdisk_unref_contextp
) struct fdisk_context
*c
= NULL
;
1630 _cleanup_free_
char *path
= NULL
, *disk_uuid_as_string
= NULL
;
1631 uint64_t offset
, size
, first_lba
, start
, last_lba
, end
;
1632 sd_id128_t disk_uuid
;
1640 t
= fdisk_new_parttype();
1644 r
= fdisk_parttype_set_typestr(t
, "773f91ef-66d4-49b5-bd83-d683bf40ad16");
1646 return log_error_errno(r
, "Failed to initialize partition type: %m");
1648 c
= fdisk_new_context();
1652 if (asprintf(&path
, "/proc/self/fd/%i", fd
) < 0)
1655 r
= fdisk_assign_device(c
, path
, 0);
1657 return log_error_errno(r
, "Failed to open device: %m");
1659 r
= fdisk_create_disklabel(c
, "gpt");
1661 return log_error_errno(r
, "Failed to create GPT disk label: %m");
1663 p
= fdisk_new_partition();
1667 r
= fdisk_partition_set_type(p
, t
);
1669 return log_error_errno(r
, "Failed to set partition type: %m");
1671 r
= fdisk_partition_partno_follow_default(p
, 1);
1673 return log_error_errno(r
, "Failed to place partition at first free partition index: %m");
1675 first_lba
= fdisk_get_first_lba(c
); /* Boundary where usable space starts */
1676 assert(first_lba
<= UINT64_MAX
/512);
1677 start
= DISK_SIZE_ROUND_UP(first_lba
* 512); /* Round up to multiple of 4K */
1679 if (start
== UINT64_MAX
)
1680 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
), "Overflow while rounding up start LBA.");
1682 last_lba
= fdisk_get_last_lba(c
); /* One sector before boundary where usable space ends */
1683 assert(last_lba
< UINT64_MAX
/512);
1684 end
= DISK_SIZE_ROUND_DOWN((last_lba
+ 1) * 512); /* Round down to multiple of 4K */
1687 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
), "Resulting partition size zero or negative.");
1689 r
= fdisk_partition_set_start(p
, start
/ 512);
1691 return log_error_errno(r
, "Failed to place partition at offset %" PRIu64
": %m", start
);
1693 r
= fdisk_partition_set_size(p
, (end
- start
) / 512);
1695 return log_error_errno(r
, "Failed to end partition at offset %" PRIu64
": %m", end
);
1697 r
= fdisk_partition_set_name(p
, label
);
1699 return log_error_errno(r
, "Failed to set partition name: %m");
1701 r
= fdisk_partition_set_uuid(p
, ID128_TO_UUID_STRING(uuid
));
1703 return log_error_errno(r
, "Failed to set partition UUID: %m");
1705 r
= fdisk_add_partition(c
, p
, NULL
);
1707 return log_error_errno(r
, "Failed to add partition: %m");
1709 r
= fdisk_write_disklabel(c
);
1711 return log_error_errno(r
, "Failed to write disk label: %m");
1713 r
= fdisk_get_disklabel_id(c
, &disk_uuid_as_string
);
1715 return log_error_errno(r
, "Failed to determine disk label UUID: %m");
1717 r
= sd_id128_from_string(disk_uuid_as_string
, &disk_uuid
);
1719 return log_error_errno(r
, "Failed to parse disk label UUID: %m");
1721 r
= fdisk_get_partition(c
, 0, &q
);
1723 return log_error_errno(r
, "Failed to read created partition metadata: %m");
1725 assert(fdisk_partition_has_start(q
));
1726 offset
= fdisk_partition_get_start(q
);
1727 if (offset
> UINT64_MAX
/ 512U)
1728 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
), "Partition offset too large.");
1730 assert(fdisk_partition_has_size(q
));
1731 size
= fdisk_partition_get_size(q
);
1732 if (size
> UINT64_MAX
/ 512U)
1733 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
), "Partition size too large.");
1735 *ret_offset
= offset
* 512U;
1736 *ret_size
= size
* 512U;
1737 *ret_disk_uuid
= disk_uuid
;
1742 static bool supported_fs_size(const char *fstype
, uint64_t host_size
) {
1745 m
= minimal_size_by_fs_name(fstype
);
1746 if (m
== UINT64_MAX
)
1749 return host_size
>= m
;
1752 static int wait_for_devlink(const char *path
) {
1753 _cleanup_close_
int inotify_fd
= -1;
1757 /* let's wait for a device link to show up in /dev, with a timeout. This is good to do since we
1758 * return a /dev/disk/by-uuid/… link to our callers and they likely want to access it right-away,
1759 * hence let's wait until udev has caught up with our changes, and wait for the symlink to be
1762 until
= usec_add(now(CLOCK_MONOTONIC
), 45 * USEC_PER_SEC
);
1765 _cleanup_free_
char *dn
= NULL
;
1768 if (laccess(path
, F_OK
) < 0) {
1769 if (errno
!= ENOENT
)
1770 return log_error_errno(errno
, "Failed to determine whether %s exists: %m", path
);
1772 return 0; /* Found it */
1774 if (inotify_fd
< 0) {
1775 /* We need to wait for the device symlink to show up, let's create an inotify watch for it */
1776 inotify_fd
= inotify_init1(IN_NONBLOCK
|IN_CLOEXEC
);
1778 return log_error_errno(errno
, "Failed to allocate inotify fd: %m");
1781 dn
= dirname_malloc(path
);
1786 log_info("Watching %s", dn
);
1788 if (inotify_add_watch(inotify_fd
, dn
, IN_CREATE
|IN_MOVED_TO
|IN_ONLYDIR
|IN_DELETE_SELF
|IN_MOVE_SELF
) < 0) {
1789 if (errno
!= ENOENT
)
1790 return log_error_errno(errno
, "Failed to add watch on %s: %m", dn
);
1794 if (empty_or_root(dn
))
1797 dn
= dirname_malloc(dn
);
1800 w
= now(CLOCK_MONOTONIC
);
1802 return log_error_errno(SYNTHETIC_ERRNO(ETIMEDOUT
), "Device link %s still hasn't shown up, giving up.", path
);
1804 r
= fd_wait_for_event(inotify_fd
, POLLIN
, usec_sub_unsigned(until
, w
));
1806 return log_error_errno(r
, "Failed to watch inotify: %m");
1808 (void) flush_fd(inotify_fd
);
1812 static int calculate_disk_size(UserRecord
*h
, const char *parent_dir
, uint64_t *ret
) {
1820 if (h
->disk_size
!= UINT64_MAX
) {
1821 *ret
= DISK_SIZE_ROUND_DOWN(h
->disk_size
);
1825 if (statfs(parent_dir
, &sfs
) < 0)
1826 return log_error_errno(errno
, "statfs() on %s failed: %m", parent_dir
);
1828 m
= sfs
.f_bsize
* sfs
.f_bavail
;
1830 if (h
->disk_size_relative
== UINT64_MAX
) {
1832 if (m
> UINT64_MAX
/ USER_DISK_SIZE_DEFAULT_PERCENT
)
1833 return log_error_errno(SYNTHETIC_ERRNO(EOVERFLOW
), "Disk size too large.");
1835 *ret
= DISK_SIZE_ROUND_DOWN(m
* USER_DISK_SIZE_DEFAULT_PERCENT
/ 100);
1837 log_info("Sizing home to %u%% of available disk space, which is %s.",
1838 USER_DISK_SIZE_DEFAULT_PERCENT
,
1839 FORMAT_BYTES(*ret
));
1841 *ret
= DISK_SIZE_ROUND_DOWN((uint64_t) ((double) m
* (double) h
->disk_size_relative
/ (double) UINT32_MAX
));
1843 log_info("Sizing home to %" PRIu64
".%01" PRIu64
"%% of available disk space, which is %s.",
1844 (h
->disk_size_relative
* 100) / UINT32_MAX
,
1845 ((h
->disk_size_relative
* 1000) / UINT32_MAX
) % 10,
1846 FORMAT_BYTES(*ret
));
1849 if (*ret
< USER_DISK_SIZE_MIN
)
1850 *ret
= USER_DISK_SIZE_MIN
;
1855 static int home_truncate(
1868 trunc
= user_record_luks_discard(h
);
1870 r
= fallocate(fd
, 0, 0, size
);
1871 if (r
< 0 && ERRNO_IS_NOT_SUPPORTED(errno
)) {
1872 /* Some file systems do not support fallocate(), let's gracefully degrade
1873 * (ZFS, reiserfs, …) and fall back to truncation */
1874 log_notice_errno(errno
, "Backing file system does not support fallocate(), falling back to ftruncate(), i.e. implicitly using non-discard mode.");
1880 r
= ftruncate(fd
, size
);
1883 if (ERRNO_IS_DISK_SPACE(errno
)) {
1884 log_error_errno(errno
, "Not enough disk space to allocate home.");
1885 return -ENOSPC
; /* make recognizable */
1888 return log_error_errno(errno
, "Failed to truncate home image %s: %m", path
);
1894 int home_create_luks(
1896 PasswordCache
*cache
,
1897 char **effective_passwords
,
1898 UserRecord
**ret_home
) {
1900 _cleanup_free_
char *dm_name
= NULL
, *dm_node
= NULL
, *subdir
= NULL
, *disk_uuid_path
= NULL
, *temporary_image_path
= NULL
;
1901 uint64_t encrypted_size
,
1902 host_size
= 0, partition_offset
= 0, partition_size
= 0; /* Unnecessary initialization to appease gcc */
1903 bool image_created
= false, dm_activated
= false, mounted
= false;
1904 _cleanup_(user_record_unrefp
) UserRecord
*new_home
= NULL
;
1905 sd_id128_t partition_uuid
, fs_uuid
, luks_uuid
, disk_uuid
;
1906 _cleanup_(loop_device_unrefp
) LoopDevice
*loop
= NULL
;
1907 _cleanup_(sym_crypt_freep
) struct crypt_device
*cd
= NULL
;
1908 _cleanup_close_
int image_fd
= -1, root_fd
= -1;
1909 const char *fstype
, *ip
;
1914 assert(h
->storage
< 0 || h
->storage
== USER_LUKS
);
1917 r
= dlopen_cryptsetup();
1921 assert_se(ip
= user_record_image_path(h
));
1923 fstype
= user_record_file_system_type(h
);
1924 if (!supported_fstype(fstype
))
1925 return log_error_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT
), "Unsupported file system type: %s", fstype
);
1927 r
= mkfs_exists(fstype
);
1929 return log_error_errno(r
, "Failed to check if mkfs binary for %s exists: %m", fstype
);
1931 if (h
->file_system_type
|| streq(fstype
, "ext4") || !supported_fstype("ext4"))
1932 return log_error_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT
), "mkfs binary for file system type %s does not exist.", fstype
);
1934 /* If the record does not explicitly declare a file system to use, and the compiled-in
1935 * default does not actually exist, than do an automatic fallback onto ext4, as the baseline
1936 * fs of Linux. We won't search for a working fs type here beyond ext4, i.e. nothing fancier
1937 * than a single, conservative fallback to baseline. This should be useful in minimal
1938 * environments where mkfs.btrfs or so are not made available, but mkfs.ext4 as Linux' most
1939 * boring, most basic fs is. */
1940 log_info("Formatting tool for compiled-in default file system %s not available, falling back to ext4 instead.", fstype
);
1944 if (sd_id128_is_null(h
->partition_uuid
)) {
1945 r
= sd_id128_randomize(&partition_uuid
);
1947 return log_error_errno(r
, "Failed to acquire partition UUID: %m");
1949 partition_uuid
= h
->partition_uuid
;
1951 if (sd_id128_is_null(h
->luks_uuid
)) {
1952 r
= sd_id128_randomize(&luks_uuid
);
1954 return log_error_errno(r
, "Failed to acquire LUKS UUID: %m");
1956 luks_uuid
= h
->luks_uuid
;
1958 if (sd_id128_is_null(h
->file_system_uuid
)) {
1959 r
= sd_id128_randomize(&fs_uuid
);
1961 return log_error_errno(r
, "Failed to acquire file system UUID: %m");
1963 fs_uuid
= h
->file_system_uuid
;
1965 r
= make_dm_names(h
->user_name
, &dm_name
, &dm_node
);
1969 r
= access(dm_node
, F_OK
);
1971 if (errno
!= ENOENT
)
1972 return log_error_errno(errno
, "Failed to determine whether %s exists: %m", dm_node
);
1974 return log_error_errno(SYNTHETIC_ERRNO(EEXIST
), "Device mapper device %s already exists, refusing.", dm_node
);
1976 if (path_startswith(ip
, "/dev/")) {
1977 _cleanup_free_
char *sysfs
= NULL
;
1978 uint64_t block_device_size
;
1981 /* Let's place the home directory on a real device, i.e. an USB stick or such */
1983 image_fd
= open(ip
, O_RDWR
|O_CLOEXEC
|O_NOCTTY
|O_NONBLOCK
);
1985 return log_error_errno(errno
, "Failed to open device %s: %m", ip
);
1987 if (fstat(image_fd
, &st
) < 0)
1988 return log_error_errno(errno
, "Failed to stat device %s: %m", ip
);
1989 if (!S_ISBLK(st
.st_mode
))
1990 return log_error_errno(SYNTHETIC_ERRNO(ENOTBLK
), "Device is not a block device, refusing.");
1992 if (asprintf(&sysfs
, "/sys/dev/block/%u:%u/partition", major(st
.st_rdev
), minor(st
.st_rdev
)) < 0)
1994 if (access(sysfs
, F_OK
) < 0) {
1995 if (errno
!= ENOENT
)
1996 return log_error_errno(errno
, "Failed to check whether %s exists: %m", sysfs
);
1998 return log_error_errno(SYNTHETIC_ERRNO(ENOTBLK
), "Operating on partitions is currently not supported, sorry. Please specify a top-level block device.");
2000 if (flock(image_fd
, LOCK_EX
) < 0) /* make sure udev doesn't read from it while we operate on the device */
2001 return log_error_errno(errno
, "Failed to lock block device %s: %m", ip
);
2003 if (ioctl(image_fd
, BLKGETSIZE64
, &block_device_size
) < 0)
2004 return log_error_errno(errno
, "Failed to read block device size: %m");
2006 if (h
->disk_size
== UINT64_MAX
) {
2008 /* If a relative disk size is requested, apply it relative to the block device size */
2009 if (h
->disk_size_relative
< UINT32_MAX
)
2010 host_size
= CLAMP(DISK_SIZE_ROUND_DOWN(block_device_size
* h
->disk_size_relative
/ UINT32_MAX
),
2011 USER_DISK_SIZE_MIN
, USER_DISK_SIZE_MAX
);
2013 host_size
= block_device_size
; /* Otherwise, take the full device */
2015 } else if (h
->disk_size
> block_device_size
)
2016 return log_error_errno(SYNTHETIC_ERRNO(EMSGSIZE
), "Selected disk size larger than backing block device, refusing.");
2018 host_size
= DISK_SIZE_ROUND_DOWN(h
->disk_size
);
2020 if (!supported_fs_size(fstype
, host_size
))
2021 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
),
2022 "Selected file system size too small for %s.", fstype
);
2024 /* After creation we should reference this partition by its UUID instead of the block
2025 * device. That's preferable since the user might have specified a device node such as
2026 * /dev/sdb to us, which might look very different when replugged. */
2027 if (asprintf(&disk_uuid_path
, "/dev/disk/by-uuid/" SD_ID128_UUID_FORMAT_STR
, SD_ID128_FORMAT_VAL(luks_uuid
)) < 0)
2030 if (user_record_luks_discard(h
) || user_record_luks_offline_discard(h
)) {
2031 /* If we want online or offline discard, discard once before we start using things. */
2033 if (ioctl(image_fd
, BLKDISCARD
, (uint64_t[]) { 0, block_device_size
}) < 0)
2034 log_full_errno(errno
== EOPNOTSUPP
? LOG_DEBUG
: LOG_WARNING
, errno
,
2035 "Failed to issue full-device BLKDISCARD on device, ignoring: %m");
2037 log_info("Full device discard completed.");
2040 _cleanup_free_
char *parent
= NULL
;
2042 parent
= dirname_malloc(ip
);
2046 r
= mkdir_p(parent
, 0755);
2048 return log_error_errno(r
, "Failed to create parent directory %s: %m", parent
);
2050 r
= calculate_disk_size(h
, parent
, &host_size
);
2054 if (!supported_fs_size(fstype
, host_size
))
2055 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
), "Selected file system size too small for %s.", fstype
);
2057 r
= tempfn_random(ip
, "homework", &temporary_image_path
);
2059 return log_error_errno(r
, "Failed to derive temporary file name for %s: %m", ip
);
2061 image_fd
= open(temporary_image_path
, O_RDWR
|O_CREAT
|O_EXCL
|O_CLOEXEC
|O_NOCTTY
|O_NOFOLLOW
, 0600);
2063 return log_error_errno(errno
, "Failed to create home image %s: %m", temporary_image_path
);
2065 image_created
= true;
2067 r
= chattr_fd(image_fd
, FS_NOCOW_FL
, FS_NOCOW_FL
, NULL
);
2069 log_full_errno(ERRNO_IS_NOT_SUPPORTED(r
) ? LOG_DEBUG
: LOG_WARNING
, r
,
2070 "Failed to set file attributes on %s, ignoring: %m", temporary_image_path
);
2072 r
= home_truncate(h
, image_fd
, temporary_image_path
, host_size
);
2076 log_info("Allocating image file completed.");
2079 r
= make_partition_table(
2081 user_record_user_name_and_realm(h
),
2089 log_info("Writing of partition table completed.");
2091 r
= loop_device_make(image_fd
, O_RDWR
, partition_offset
, partition_size
, 0, &loop
);
2093 if (r
== -ENOENT
) { /* this means /dev/loop-control doesn't exist, i.e. we are in a container
2094 * or similar and loopback bock devices are not available, return a
2095 * recognizable error in this case. */
2096 log_error_errno(r
, "Loopback block device support is not available on this system.");
2101 log_error_errno(r
, "Failed to set up loopback device for %s: %m", temporary_image_path
);
2105 r
= loop_device_flock(loop
, LOCK_EX
); /* make sure udev won't read before we are done */
2107 log_error_errno(r
, "Failed to take lock on loop device: %m");
2111 log_info("Setting up loopback device %s completed.", loop
->node
?: ip
);
2113 r
= luks_format(loop
->node
,
2116 user_record_user_name_and_realm(h
),
2118 effective_passwords
,
2119 user_record_luks_discard(h
) || user_record_luks_offline_discard(h
),
2125 dm_activated
= true;
2127 r
= block_get_size_by_path(dm_node
, &encrypted_size
);
2129 log_error_errno(r
, "Failed to get encrypted block device size: %m");
2133 log_info("Setting up LUKS device %s completed.", dm_node
);
2135 r
= make_filesystem(dm_node
, fstype
, user_record_user_name_and_realm(h
), fs_uuid
, user_record_luks_discard(h
));
2139 log_info("Formatting file system completed.");
2141 r
= home_unshare_and_mount(dm_node
, fstype
, user_record_luks_discard(h
), user_record_mount_flags(h
));
2147 subdir
= path_join("/run/systemd/user-home-mount/", user_record_user_name_and_realm(h
));
2153 /* Prefer using a btrfs subvolume if we can, fall back to directory otherwise */
2154 r
= btrfs_subvol_make_fallback(subdir
, 0700);
2156 log_error_errno(r
, "Failed to create user directory in mounted image file: %m");
2160 root_fd
= open(subdir
, O_RDONLY
|O_CLOEXEC
|O_DIRECTORY
|O_NOFOLLOW
);
2162 r
= log_error_errno(errno
, "Failed to open user directory in mounted image file: %m");
2166 r
= home_populate(h
, root_fd
);
2170 r
= home_sync_and_statfs(root_fd
, &sfs
);
2174 r
= user_record_clone(h
, USER_RECORD_LOAD_MASK_SECRET
|USER_RECORD_LOG
|USER_RECORD_PERMISSIVE
, &new_home
);
2176 log_error_errno(r
, "Failed to clone record: %m");
2180 r
= user_record_add_binding(
2183 disk_uuid_path
?: ip
,
2187 sym_crypt_get_cipher(cd
),
2188 sym_crypt_get_cipher_mode(cd
),
2189 luks_volume_key_size_convert(cd
),
2195 log_error_errno(r
, "Failed to add binding to record: %m");
2199 if (user_record_luks_offline_discard(h
)) {
2200 r
= run_fitrim(root_fd
);
2205 root_fd
= safe_close(root_fd
);
2207 r
= umount_verbose(LOG_ERR
, "/run/systemd/user-home-mount", UMOUNT_NOFOLLOW
);
2213 r
= sym_crypt_deactivate_by_name(cd
, dm_name
, 0);
2215 log_error_errno(r
, "Failed to deactivate LUKS device: %m");
2222 dm_activated
= false;
2224 loop
= loop_device_unref(loop
);
2226 if (!user_record_luks_offline_discard(h
)) {
2227 r
= run_fallocate(image_fd
, NULL
/* refresh stat() data */);
2232 /* Sync everything to disk before we move things into place under the final name. */
2233 if (fsync(image_fd
) < 0) {
2234 r
= log_error_errno(r
, "Failed to synchronize image to disk: %m");
2239 (void) ioctl(image_fd
, BLKRRPART
, 0);
2241 /* If we operate on a file, sync the containing directory too. */
2242 r
= fsync_directory_of_file(image_fd
);
2244 log_error_errno(r
, "Failed to synchronize directory of image file to disk: %m");
2249 /* Let's close the image fd now. If we are operating on a real block device this will release the BSD
2250 * lock that ensures udev doesn't interfere with what we are doing */
2251 image_fd
= safe_close(image_fd
);
2253 if (temporary_image_path
) {
2254 if (rename(temporary_image_path
, ip
) < 0) {
2255 log_error_errno(errno
, "Failed to rename image file: %m");
2259 log_info("Moved image file into place.");
2263 (void) wait_for_devlink(disk_uuid_path
);
2265 log_info("Everything completed.");
2267 print_size_summary(host_size
, encrypted_size
, &sfs
);
2269 *ret_home
= TAKE_PTR(new_home
);
2273 /* Let's close all files before we unmount the file system, to avoid EBUSY */
2274 root_fd
= safe_close(root_fd
);
2277 (void) umount_verbose(LOG_WARNING
, "/run/systemd/user-home-mount", UMOUNT_NOFOLLOW
);
2280 (void) sym_crypt_deactivate_by_name(cd
, dm_name
, 0);
2282 loop
= loop_device_unref(loop
);
2285 (void) unlink(temporary_image_path
);
2290 int home_validate_update_luks(UserRecord
*h
, HomeSetup
*setup
) {
2291 _cleanup_free_
char *dm_name
= NULL
, *dm_node
= NULL
;
2297 r
= make_dm_names(h
->user_name
, &dm_name
, &dm_node
);
2301 r
= access(dm_node
, F_OK
);
2302 if (r
< 0 && errno
!= ENOENT
)
2303 return log_error_errno(errno
, "Failed to determine whether %s exists: %m", dm_node
);
2305 free_and_replace(setup
->dm_name
, dm_name
);
2306 free_and_replace(setup
->dm_node
, dm_node
);
2316 static int can_resize_fs(int fd
, uint64_t old_size
, uint64_t new_size
) {
2321 /* Filter out bogus requests early */
2322 if (old_size
== 0 || old_size
== UINT64_MAX
||
2323 new_size
== 0 || new_size
== UINT64_MAX
)
2324 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Invalid resize parameters.");
2326 if ((old_size
& 511) != 0 || (new_size
& 511) != 0)
2327 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Resize parameters not multiple of 512.");
2329 if (fstatfs(fd
, &sfs
) < 0)
2330 return log_error_errno(errno
, "Failed to fstatfs() file system: %m");
2332 if (is_fs_type(&sfs
, BTRFS_SUPER_MAGIC
)) {
2334 if (new_size
< BTRFS_MINIMAL_SIZE
)
2335 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
), "New file system size too small for btrfs (needs to be 256M at least.");
2337 /* btrfs can grow and shrink online */
2339 } else if (is_fs_type(&sfs
, XFS_SB_MAGIC
)) {
2341 if (new_size
< XFS_MINIMAL_SIZE
)
2342 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
), "New file system size too small for xfs (needs to be 14M at least).");
2344 /* XFS can grow, but not shrink */
2345 if (new_size
< old_size
)
2346 return log_error_errno(SYNTHETIC_ERRNO(EMSGSIZE
), "Shrinking this type of file system is not supported.");
2348 } else if (is_fs_type(&sfs
, EXT4_SUPER_MAGIC
)) {
2350 if (new_size
< EXT4_MINIMAL_SIZE
)
2351 return log_error_errno(SYNTHETIC_ERRNO(ERANGE
), "New file system size too small for ext4 (needs to be 1M at least).");
2353 /* ext4 can grow online, and shrink offline */
2354 if (new_size
< old_size
)
2355 return CAN_RESIZE_OFFLINE
;
2358 return log_error_errno(SYNTHETIC_ERRNO(ESOCKTNOSUPPORT
), "Resizing this type of file system is not supported.");
2360 return CAN_RESIZE_ONLINE
;
2363 static int ext4_offline_resize_fs(HomeSetup
*setup
, uint64_t new_size
, bool discard
, unsigned long flags
) {
2364 _cleanup_free_
char *size_str
= NULL
;
2365 bool re_open
= false, re_mount
= false;
2366 pid_t resize_pid
, fsck_pid
;
2370 assert(setup
->dm_node
);
2372 /* First, unmount the file system */
2373 if (setup
->root_fd
>= 0) {
2374 setup
->root_fd
= safe_close(setup
->root_fd
);
2378 if (setup
->undo_mount
) {
2379 r
= umount_verbose(LOG_ERR
, "/run/systemd/user-home-mount", UMOUNT_NOFOLLOW
);
2383 setup
->undo_mount
= false;
2387 log_info("Temporary unmounting of file system completed.");
2389 /* resize2fs requires that the file system is force checked first, do so. */
2390 r
= safe_fork("(e2fsck)",
2391 FORK_RESET_SIGNALS
|FORK_RLIMIT_NOFILE_SAFE
|FORK_DEATHSIG
|FORK_LOG
|FORK_STDOUT_TO_STDERR
|FORK_CLOSE_ALL_FDS
,
2397 execlp("e2fsck" ,"e2fsck", "-fp", setup
->dm_node
, NULL
);
2399 log_error_errno(errno
, "Failed to execute e2fsck: %m");
2400 _exit(EXIT_FAILURE
);
2403 exit_status
= wait_for_terminate_and_check("e2fsck", fsck_pid
, WAIT_LOG_ABNORMAL
);
2404 if (exit_status
< 0)
2406 if ((exit_status
& ~FSCK_ERROR_CORRECTED
) != 0) {
2407 log_warning("e2fsck failed with exit status %i.", exit_status
);
2409 if ((exit_status
& (FSCK_SYSTEM_SHOULD_REBOOT
|FSCK_ERRORS_LEFT_UNCORRECTED
)) != 0)
2410 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "File system is corrupted, refusing.");
2412 log_warning("Ignoring fsck error.");
2415 log_info("Forced file system check completed.");
2417 /* We use 512 sectors here, because resize2fs doesn't do byte sizes */
2418 if (asprintf(&size_str
, "%" PRIu64
"s", new_size
/ 512) < 0)
2421 /* Resize the thing */
2422 r
= safe_fork("(e2resize)",
2423 FORK_RESET_SIGNALS
|FORK_RLIMIT_NOFILE_SAFE
|FORK_DEATHSIG
|FORK_LOG
|FORK_WAIT
|FORK_STDOUT_TO_STDERR
|FORK_CLOSE_ALL_FDS
,
2429 execlp("resize2fs" ,"resize2fs", setup
->dm_node
, size_str
, NULL
);
2431 log_error_errno(errno
, "Failed to execute resize2fs: %m");
2432 _exit(EXIT_FAILURE
);
2435 log_info("Offline file system resize completed.");
2437 /* Re-establish mounts and reopen the directory */
2439 r
= home_mount_node(setup
->dm_node
, "ext4", discard
, flags
);
2443 setup
->undo_mount
= true;
2447 setup
->root_fd
= open("/run/systemd/user-home-mount", O_RDONLY
|O_CLOEXEC
|O_DIRECTORY
|O_NOFOLLOW
);
2448 if (setup
->root_fd
< 0)
2449 return log_error_errno(errno
, "Failed to reopen file system: %m");
2452 log_info("File system mounted again.");
2457 static int prepare_resize_partition(
2459 uint64_t partition_offset
,
2460 uint64_t old_partition_size
,
2461 uint64_t new_partition_size
,
2462 sd_id128_t
*ret_disk_uuid
,
2463 struct fdisk_table
**ret_table
) {
2465 _cleanup_(fdisk_unref_contextp
) struct fdisk_context
*c
= NULL
;
2466 _cleanup_(fdisk_unref_tablep
) struct fdisk_table
*t
= NULL
;
2467 _cleanup_free_
char *path
= NULL
, *disk_uuid_as_string
= NULL
;
2468 size_t n_partitions
;
2469 sd_id128_t disk_uuid
;
2474 assert(ret_disk_uuid
);
2477 assert((partition_offset
& 511) == 0);
2478 assert((old_partition_size
& 511) == 0);
2479 assert((new_partition_size
& 511) == 0);
2480 assert(UINT64_MAX
- old_partition_size
>= partition_offset
);
2481 assert(UINT64_MAX
- new_partition_size
>= partition_offset
);
2483 if (partition_offset
== 0) {
2484 /* If the offset is at the beginning we assume no partition table, let's exit early. */
2485 log_debug("Not rewriting partition table, operating on naked device.");
2486 *ret_disk_uuid
= SD_ID128_NULL
;
2491 c
= fdisk_new_context();
2495 if (asprintf(&path
, "/proc/self/fd/%i", fd
) < 0)
2498 r
= fdisk_assign_device(c
, path
, 0);
2500 return log_error_errno(r
, "Failed to open device: %m");
2502 if (!fdisk_is_labeltype(c
, FDISK_DISKLABEL_GPT
))
2503 return log_error_errno(SYNTHETIC_ERRNO(ENOMEDIUM
), "Disk has no GPT partition table.");
2505 r
= fdisk_get_disklabel_id(c
, &disk_uuid_as_string
);
2507 return log_error_errno(r
, "Failed to acquire disk UUID: %m");
2509 r
= sd_id128_from_string(disk_uuid_as_string
, &disk_uuid
);
2511 return log_error_errno(r
, "Failed parse disk UUID: %m");
2513 r
= fdisk_get_partitions(c
, &t
);
2515 return log_error_errno(r
, "Failed to acquire partition table: %m");
2517 n_partitions
= fdisk_table_get_nents(t
);
2518 for (size_t i
= 0; i
< n_partitions
; i
++) {
2519 struct fdisk_partition
*p
;
2521 p
= fdisk_table_get_partition(t
, i
);
2523 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "Failed to read partition metadata: %m");
2525 if (fdisk_partition_is_used(p
) <= 0)
2527 if (fdisk_partition_has_start(p
) <= 0 || fdisk_partition_has_size(p
) <= 0 || fdisk_partition_has_end(p
) <= 0)
2528 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Found partition without a size.");
2530 if (fdisk_partition_get_start(p
) == partition_offset
/ 512U &&
2531 fdisk_partition_get_size(p
) == old_partition_size
/ 512U) {
2534 return log_error_errno(SYNTHETIC_ERRNO(ENOTUNIQ
), "Partition found twice, refusing.");
2536 /* Found our partition, now patch it */
2537 r
= fdisk_partition_size_explicit(p
, 1);
2539 return log_error_errno(r
, "Failed to enable explicit partition size: %m");
2541 r
= fdisk_partition_set_size(p
, new_partition_size
/ 512U);
2543 return log_error_errno(r
, "Failed to change partition size: %m");
2549 if (fdisk_partition_get_start(p
) < partition_offset
+ new_partition_size
/ 512U &&
2550 fdisk_partition_get_end(p
) >= partition_offset
/ 512)
2551 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Can't extend, conflicting partition found.");
2556 return log_error_errno(SYNTHETIC_ERRNO(ENOPKG
), "Failed to find matching partition to resize.");
2558 *ret_table
= TAKE_PTR(t
);
2559 *ret_disk_uuid
= disk_uuid
;
2564 static int ask_cb(struct fdisk_context
*c
, struct fdisk_ask
*ask
, void *userdata
) {
2569 switch (fdisk_ask_get_type(ask
)) {
2571 case FDISK_ASKTYPE_STRING
:
2572 result
= new(char, 37);
2576 fdisk_ask_string_set_result(ask
, id128_to_uuid_string(*(sd_id128_t
*) userdata
, result
));
2580 log_debug("Unexpected question from libfdisk, ignoring.");
2586 static int apply_resize_partition(int fd
, sd_id128_t disk_uuids
, struct fdisk_table
*t
) {
2587 _cleanup_(fdisk_unref_contextp
) struct fdisk_context
*c
= NULL
;
2588 _cleanup_free_
void *two_zero_lbas
= NULL
;
2589 _cleanup_free_
char *path
= NULL
;
2595 if (!t
) /* no partition table to apply, exit early */
2598 two_zero_lbas
= malloc0(1024U);
2602 /* libfdisk appears to get confused by the existing PMBR. Let's explicitly flush it out. */
2603 n
= pwrite(fd
, two_zero_lbas
, 1024U, 0);
2605 return log_error_errno(errno
, "Failed to wipe partition table: %m");
2607 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "Short write while wiping partition table.");
2609 c
= fdisk_new_context();
2613 if (asprintf(&path
, "/proc/self/fd/%i", fd
) < 0)
2616 r
= fdisk_assign_device(c
, path
, 0);
2618 return log_error_errno(r
, "Failed to open device: %m");
2620 r
= fdisk_create_disklabel(c
, "gpt");
2622 return log_error_errno(r
, "Failed to create GPT disk label: %m");
2624 r
= fdisk_apply_table(c
, t
);
2626 return log_error_errno(r
, "Failed to apply partition table: %m");
2628 r
= fdisk_set_ask(c
, ask_cb
, &disk_uuids
);
2630 return log_error_errno(r
, "Failed to set libfdisk query function: %m");
2632 r
= fdisk_set_disklabel_id(c
);
2634 return log_error_errno(r
, "Failed to change disklabel ID: %m");
2636 r
= fdisk_write_disklabel(c
);
2638 return log_error_errno(r
, "Failed to write disk label: %m");
2643 int home_resize_luks(
2645 bool already_activated
,
2646 PasswordCache
*cache
,
2648 UserRecord
**ret_home
) {
2650 uint64_t old_image_size
, new_image_size
, old_fs_size
, new_fs_size
, crypto_offset
, new_partition_size
;
2651 _cleanup_(user_record_unrefp
) UserRecord
*header_home
= NULL
, *embedded_home
= NULL
, *new_home
= NULL
;
2652 _cleanup_(fdisk_unref_tablep
) struct fdisk_table
*table
= NULL
;
2653 _cleanup_free_
char *whole_disk
= NULL
;
2654 _cleanup_close_
int image_fd
= -1;
2655 sd_id128_t disk_uuid
;
2656 const char *ip
, *ipo
;
2662 assert(user_record_storage(h
) == USER_LUKS
);
2666 r
= dlopen_cryptsetup();
2670 assert_se(ipo
= user_record_image_path(h
));
2671 ip
= strdupa(ipo
); /* copy out since original might change later in home record object */
2673 image_fd
= open(ip
, O_RDWR
|O_CLOEXEC
|O_NOCTTY
|O_NONBLOCK
);
2675 return log_error_errno(errno
, "Failed to open image file %s: %m", ip
);
2677 if (fstat(image_fd
, &st
) < 0)
2678 return log_error_errno(errno
, "Failed to stat image file %s: %m", ip
);
2679 if (S_ISBLK(st
.st_mode
)) {
2682 r
= block_get_whole_disk(st
.st_rdev
, &parent
);
2684 return log_error_errno(r
, "Failed to acquire whole block device for %s: %m", ip
);
2686 /* If we shall resize a file system on a partition device, then let's figure out the
2687 * whole disk device and operate on that instead, since we need to rewrite the
2688 * partition table to resize the partition. */
2690 log_info("Operating on partition device %s, using parent device.", ip
);
2692 r
= device_path_make_major_minor(st
.st_mode
, parent
, &whole_disk
);
2694 return log_error_errno(r
, "Failed to derive whole disk path for %s: %m", ip
);
2696 safe_close(image_fd
);
2698 image_fd
= open(whole_disk
, O_RDWR
|O_CLOEXEC
|O_NOCTTY
|O_NONBLOCK
);
2700 return log_error_errno(errno
, "Failed to open whole block device %s: %m", whole_disk
);
2702 if (fstat(image_fd
, &st
) < 0)
2703 return log_error_errno(errno
, "Failed to stat whole block device %s: %m", whole_disk
);
2704 if (!S_ISBLK(st
.st_mode
))
2705 return log_error_errno(SYNTHETIC_ERRNO(ENOTBLK
), "Whole block device %s is not actually a block device, refusing.", whole_disk
);
2707 log_info("Operating on whole block device %s.", ip
);
2709 if (ioctl(image_fd
, BLKGETSIZE64
, &old_image_size
) < 0)
2710 return log_error_errno(errno
, "Failed to determine size of original block device: %m");
2712 if (flock(image_fd
, LOCK_EX
) < 0) /* make sure udev doesn't read from it while we operate on the device */
2713 return log_error_errno(errno
, "Failed to lock block device %s: %m", ip
);
2715 new_image_size
= old_image_size
; /* we can't resize physical block devices */
2717 uint64_t new_image_size_rounded
;
2719 r
= stat_verify_regular(&st
);
2721 return log_error_errno(r
, "Image %s is not a block device nor regular file: %m", ip
);
2723 old_image_size
= st
.st_size
;
2725 /* Note an asymetry here: when we operate on loopback files the specified disk size we get we
2726 * apply onto the loopback file as a whole. When we operate on block devices we instead apply
2727 * to the partition itself only. */
2729 new_image_size_rounded
= DISK_SIZE_ROUND_DOWN(h
->disk_size
);
2731 if (old_image_size
== h
->disk_size
||
2732 old_image_size
== new_image_size_rounded
) {
2733 /* If exact match, or a match after we rounded down, don't do a thing */
2734 log_info("Image size already matching, skipping operation.");
2738 new_image_size
= new_image_size_rounded
;
2741 r
= home_prepare_luks(h
, already_activated
, whole_disk
, cache
, setup
, &header_home
);
2745 r
= home_load_embedded_identity(h
, setup
->root_fd
, header_home
, USER_RECONCILE_REQUIRE_NEWER_OR_EQUAL
, cache
, &embedded_home
, &new_home
);
2749 log_info("offset = %" PRIu64
", size = %" PRIu64
", image = %" PRIu64
, setup
->partition_offset
, setup
->partition_size
, old_image_size
);
2751 if ((UINT64_MAX
- setup
->partition_offset
) < setup
->partition_size
||
2752 setup
->partition_offset
+ setup
->partition_size
> old_image_size
)
2753 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Old partition doesn't fit in backing storage, refusing.");
2755 if (S_ISREG(st
.st_mode
)) {
2756 uint64_t partition_table_extra
;
2758 partition_table_extra
= old_image_size
- setup
->partition_size
;
2759 if (new_image_size
<= partition_table_extra
)
2760 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "New size smaller than partition table metadata.");
2762 new_partition_size
= DISK_SIZE_ROUND_DOWN(new_image_size
- partition_table_extra
);
2764 uint64_t new_partition_size_rounded
;
2766 assert(S_ISBLK(st
.st_mode
));
2768 new_partition_size_rounded
= DISK_SIZE_ROUND_DOWN(h
->disk_size
);
2770 if (h
->disk_size
== setup
->partition_size
||
2771 new_partition_size_rounded
== setup
->partition_size
) {
2772 log_info("Partition size already matching, skipping operation.");
2776 new_partition_size
= new_partition_size_rounded
;
2779 if ((UINT64_MAX
- setup
->partition_offset
) < new_partition_size
||
2780 setup
->partition_offset
+ new_partition_size
> new_image_size
)
2781 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "New partition doesn't fit into backing storage, refusing.");
2783 crypto_offset
= sym_crypt_get_data_offset(setup
->crypt_device
);
2784 if (setup
->partition_size
/ 512U <= crypto_offset
)
2785 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Weird, old crypto payload offset doesn't actually fit in partition size?");
2786 if (new_partition_size
/ 512U <= crypto_offset
)
2787 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "New size smaller than crypto payload offset?");
2789 old_fs_size
= (setup
->partition_size
/ 512U - crypto_offset
) * 512U;
2790 new_fs_size
= DISK_SIZE_ROUND_DOWN((new_partition_size
/ 512U - crypto_offset
) * 512U);
2792 /* Before we start doing anything, let's figure out if we actually can */
2793 resize_type
= can_resize_fs(setup
->root_fd
, old_fs_size
, new_fs_size
);
2794 if (resize_type
< 0)
2796 if (resize_type
== CAN_RESIZE_OFFLINE
&& already_activated
)
2797 return log_error_errno(SYNTHETIC_ERRNO(ETXTBSY
), "File systems of this type can only be resized offline, but is currently online.");
2799 log_info("Ready to resize image size %s → %s, partition size %s → %s, file system size %s → %s.",
2800 FORMAT_BYTES(old_image_size
),
2801 FORMAT_BYTES(new_image_size
),
2802 FORMAT_BYTES(setup
->partition_size
),
2803 FORMAT_BYTES(new_partition_size
),
2804 FORMAT_BYTES(old_fs_size
),
2805 FORMAT_BYTES(new_fs_size
));
2807 r
= prepare_resize_partition(
2809 setup
->partition_offset
,
2810 setup
->partition_size
,
2817 if (new_fs_size
> old_fs_size
) {
2819 if (S_ISREG(st
.st_mode
)) {
2820 /* Grow file size */
2821 r
= home_truncate(h
, image_fd
, ip
, new_image_size
);
2825 log_info("Growing of image file completed.");
2828 /* Make sure loopback device sees the new bigger size */
2829 r
= loop_device_refresh_size(setup
->loop
, UINT64_MAX
, new_partition_size
);
2831 log_debug_errno(r
, "Device is not a loopback device, not refreshing size.");
2833 return log_error_errno(r
, "Failed to refresh loopback device size: %m");
2835 log_info("Refreshing loop device size completed.");
2837 r
= apply_resize_partition(image_fd
, disk_uuid
, table
);
2841 log_info("Growing of partition completed.");
2843 if (ioctl(image_fd
, BLKRRPART
, 0) < 0)
2844 log_debug_errno(errno
, "BLKRRPART failed on block device, ignoring: %m");
2846 /* Tell LUKS about the new bigger size too */
2847 r
= sym_crypt_resize(setup
->crypt_device
, setup
->dm_name
, new_fs_size
/ 512U);
2849 return log_error_errno(r
, "Failed to grow LUKS device: %m");
2851 log_info("LUKS device growing completed.");
2853 r
= home_store_embedded_identity(new_home
, setup
->root_fd
, h
->uid
, embedded_home
);
2857 if (S_ISREG(st
.st_mode
)) {
2858 if (user_record_luks_discard(h
))
2859 /* Before we shrink, let's trim the file system, so that we need less space on disk during the shrinking */
2860 (void) run_fitrim(setup
->root_fd
);
2862 /* If discard is off, let's ensure all backing blocks are allocated, so that our resize operation doesn't fail half-way */
2863 r
= run_fallocate(image_fd
, &st
);
2870 /* Now resize the file system */
2871 if (resize_type
== CAN_RESIZE_ONLINE
)
2872 r
= resize_fs(setup
->root_fd
, new_fs_size
, NULL
);
2874 r
= ext4_offline_resize_fs(setup
, new_fs_size
, user_record_luks_discard(h
), user_record_mount_flags(h
));
2876 return log_error_errno(r
, "Failed to resize file system: %m");
2878 log_info("File system resizing completed.");
2880 /* Immediately sync afterwards */
2881 r
= home_sync_and_statfs(setup
->root_fd
, NULL
);
2885 if (new_fs_size
< old_fs_size
) {
2887 /* Shrink the LUKS device now, matching the new file system size */
2888 r
= sym_crypt_resize(setup
->crypt_device
, setup
->dm_name
, new_fs_size
/ 512);
2890 return log_error_errno(r
, "Failed to shrink LUKS device: %m");
2892 log_info("LUKS device shrinking completed.");
2894 if (S_ISREG(st
.st_mode
)) {
2895 /* Shrink the image file */
2896 if (ftruncate(image_fd
, new_image_size
) < 0)
2897 return log_error_errno(errno
, "Failed to shrink image file %s: %m", ip
);
2899 log_info("Shrinking of image file completed.");
2902 /* Refresh the loop devices size */
2903 r
= loop_device_refresh_size(setup
->loop
, UINT64_MAX
, new_partition_size
);
2905 log_debug_errno(r
, "Device is not a loopback device, not refreshing size.");
2907 return log_error_errno(r
, "Failed to refresh loopback device size: %m");
2909 log_info("Refreshing loop device size completed.");
2911 r
= apply_resize_partition(image_fd
, disk_uuid
, table
);
2915 log_info("Shrinking of partition completed.");
2917 if (ioctl(image_fd
, BLKRRPART
, 0) < 0)
2918 log_debug_errno(errno
, "BLKRRPART failed on block device, ignoring: %m");
2920 r
= home_store_embedded_identity(new_home
, setup
->root_fd
, h
->uid
, embedded_home
);
2925 r
= home_store_header_identity_luks(new_home
, setup
, header_home
);
2929 r
= home_extend_embedded_identity(new_home
, h
, setup
);
2933 if (user_record_luks_discard(h
))
2934 (void) run_fitrim(setup
->root_fd
);
2936 r
= home_sync_and_statfs(setup
->root_fd
, &sfs
);
2940 r
= home_setup_undo(setup
);
2944 log_info("Everything completed.");
2946 print_size_summary(new_image_size
, new_fs_size
, &sfs
);
2948 *ret_home
= TAKE_PTR(new_home
);
2952 int home_passwd_luks(
2955 PasswordCache
*cache
, /* the passwords acquired via PKCS#11/FIDO2 security tokens */
2956 char **effective_passwords
/* new passwords */) {
2958 size_t volume_key_size
, max_key_slots
, n_effective
;
2959 _cleanup_(erase_and_freep
) void *volume_key
= NULL
;
2960 struct crypt_pbkdf_type good_pbkdf
, minimal_pbkdf
;
2966 assert(user_record_storage(h
) == USER_LUKS
);
2969 r
= dlopen_cryptsetup();
2973 type
= sym_crypt_get_type(setup
->crypt_device
);
2975 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine crypto device type.");
2977 r
= sym_crypt_keyslot_max(type
);
2979 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine number of key slots.");
2982 r
= sym_crypt_get_volume_key_size(setup
->crypt_device
);
2984 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine volume key size.");
2985 volume_key_size
= (size_t) r
;
2987 volume_key
= malloc(volume_key_size
);
2992 FOREACH_POINTER(list
, cache
->pkcs11_passwords
, cache
->fido2_passwords
, h
->password
) {
2993 r
= luks_try_passwords(setup
->crypt_device
, list
, volume_key
, &volume_key_size
);
2998 return log_error_errno(SYNTHETIC_ERRNO(ENOKEY
), "Failed to unlock LUKS superblock with supplied passwords.");
3000 return log_error_errno(r
, "Failed to unlocks LUKS superblock: %m");
3002 n_effective
= strv_length(effective_passwords
);
3004 build_good_pbkdf(&good_pbkdf
, h
);
3005 build_minimal_pbkdf(&minimal_pbkdf
, h
);
3007 for (size_t i
= 0; i
< max_key_slots
; i
++) {
3008 r
= sym_crypt_keyslot_destroy(setup
->crypt_device
, i
);
3009 if (r
< 0 && !IN_SET(r
, -ENOENT
, -EINVAL
)) /* Returns EINVAL or ENOENT if there's no key in this slot already */
3010 return log_error_errno(r
, "Failed to destroy LUKS password: %m");
3012 if (i
>= n_effective
) {
3014 log_info("Destroyed LUKS key slot %zu.", i
);
3018 if (strv_contains(cache
->pkcs11_passwords
, effective_passwords
[i
]) ||
3019 strv_contains(cache
->fido2_passwords
, effective_passwords
[i
])) {
3020 log_debug("Using minimal PBKDF for slot %zu", i
);
3021 r
= sym_crypt_set_pbkdf_type(setup
->crypt_device
, &minimal_pbkdf
);
3023 log_debug("Using good PBKDF for slot %zu", i
);
3024 r
= sym_crypt_set_pbkdf_type(setup
->crypt_device
, &good_pbkdf
);
3027 return log_error_errno(r
, "Failed to tweak PBKDF for slot %zu: %m", i
);
3029 r
= sym_crypt_keyslot_add_by_volume_key(
3030 setup
->crypt_device
,
3034 effective_passwords
[i
],
3035 strlen(effective_passwords
[i
]));
3037 return log_error_errno(r
, "Failed to set up LUKS password: %m");
3039 log_info("Updated LUKS key slot %zu.", i
);
3045 int home_lock_luks(UserRecord
*h
) {
3046 _cleanup_(sym_crypt_freep
) struct crypt_device
*cd
= NULL
;
3047 _cleanup_free_
char *dm_name
= NULL
, *dm_node
= NULL
;
3048 _cleanup_close_
int root_fd
= -1;
3054 assert_se(p
= user_record_home_directory(h
));
3055 root_fd
= open(p
, O_RDONLY
|O_CLOEXEC
|O_DIRECTORY
|O_NOFOLLOW
);
3057 return log_error_errno(errno
, "Failed to open home directory: %m");
3059 r
= make_dm_names(h
->user_name
, &dm_name
, &dm_node
);
3063 r
= dlopen_cryptsetup();
3067 r
= sym_crypt_init_by_name(&cd
, dm_name
);
3069 return log_error_errno(r
, "Failed to initialize cryptsetup context for %s: %m", dm_name
);
3071 log_info("Discovered used LUKS device %s.", dm_node
);
3072 cryptsetup_enable_logging(cd
);
3074 if (syncfs(root_fd
) < 0) /* Snake oil, but let's better be safe than sorry */
3075 return log_error_errno(errno
, "Failed to synchronize file system %s: %m", p
);
3077 root_fd
= safe_close(root_fd
);
3079 log_info("File system synchronized.");
3081 /* Note that we don't invoke FIFREEZE here, it appears libcryptsetup/device-mapper already does that on its own for us */
3083 r
= sym_crypt_suspend(cd
, dm_name
);
3085 return log_error_errno(r
, "Failed to suspend cryptsetup device: %s: %m", dm_node
);
3087 log_info("LUKS device suspended.");
3091 static int luks_try_resume(
3092 struct crypt_device
*cd
,
3093 const char *dm_name
,
3102 STRV_FOREACH(pp
, password
) {
3103 r
= sym_crypt_resume_by_passphrase(
3110 log_info("Resumed LUKS device %s.", dm_name
);
3114 log_debug_errno(r
, "Password %zu didn't work for resuming device: %m", (size_t) (pp
- password
));
3120 int home_unlock_luks(UserRecord
*h
, PasswordCache
*cache
) {
3121 _cleanup_free_
char *dm_name
= NULL
, *dm_node
= NULL
;
3122 _cleanup_(sym_crypt_freep
) struct crypt_device
*cd
= NULL
;
3128 r
= make_dm_names(h
->user_name
, &dm_name
, &dm_node
);
3132 r
= dlopen_cryptsetup();
3136 r
= sym_crypt_init_by_name(&cd
, dm_name
);
3138 return log_error_errno(r
, "Failed to initialize cryptsetup context for %s: %m", dm_name
);
3140 log_info("Discovered used LUKS device %s.", dm_node
);
3141 cryptsetup_enable_logging(cd
);
3144 FOREACH_POINTER(list
, cache
->pkcs11_passwords
, cache
->fido2_passwords
, h
->password
) {
3145 r
= luks_try_resume(cd
, dm_name
, list
);
3150 return log_error_errno(r
, "No valid password for LUKS superblock.");
3152 return log_error_errno(r
, "Failed to resume LUKS superblock: %m");
3154 log_info("LUKS device resumed.");