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Merge pull request #21331 from poettering/luks-extra-mount-options

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homed: allow per-user additional LUKS mount options
This commit is contained in:
Lennart Poettering 2021-11-13 08:03:55 +01:00 committed by GitHub
parent 9cc6154608 5dd57a00d5
commit b1beb00406
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GPG key ID: 4AEE18F83AFDEB23
9 changed files with 66 additions and 23 deletions
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3
docs/USER_RECORD.md
View file

@ -476,6 +476,9 @@ executed to make sure the image matches the selected option.
to trim/allocate the file system/backing file when deactivating the home
directory.
`luksExtraMountOptions` → A string with additional mount options to append to
the default mount options for the file system in the LUKS volume.
`luksCipher` → A string, indicating the cipher to use for the LUKS storage mechanism.
`luksCipherMode` → A string, selecting the cipher mode to use for the LUKS storage mechanism.

8
man/homectl.xml
View file

@ -656,6 +656,14 @@
to on, to ensure disk space is minimized while a user is not logged in.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--luks-extra-mount-options=</option><replaceable>OPTIONS</replaceable></term>
<listitem><para>Takes a string containing additional mount options to use when mounting the LUKS
volume. If specified, this string will be appended to the default, built-in mount
options.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--luks-cipher=</option><replaceable>CIPHER</replaceable></term>
<term><option>--luks-cipher-mode=</option><replaceable>MODE</replaceable></term>

8
src/home/homectl.c
View file

@ -2153,6 +2153,8 @@ static int help(int argc, char *argv[], void *userdata) {
" Memory cost for PBKDF in bytes\n"
" --luks-pbkdf-parallel-threads=NUMBER\n"
" Number of parallel threads for PKBDF\n"
" --luks-extra-mount-options=OPTIONS\n"
" LUKS extra mount options\n"
"\n%4$sMounting User Record Properties:%5$s\n"
" --nosuid=BOOL Control the 'nosuid' flag of the home mount\n"
" --nodev=BOOL Control the 'nodev' flag of the home mount\n"
@ -2251,6 +2253,7 @@ static int parse_argv(int argc, char *argv[]) {
ARG_AND_RESIZE,
ARG_AND_CHANGE_PASSWORD,
ARG_DROP_CACHES,
ARG_LUKS_EXTRA_MOUNT_OPTIONS,
};
static const struct option options[] = {
@ -2335,6 +2338,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "and-resize", required_argument, NULL, ARG_AND_RESIZE },
{ "and-change-password", required_argument, NULL, ARG_AND_CHANGE_PASSWORD },
{ "drop-caches", required_argument, NULL, ARG_DROP_CACHES },
{ "luks-extra-mount-options", required_argument, NULL, ARG_LUKS_EXTRA_MOUNT_OPTIONS },
{}
};
@ -2452,7 +2456,8 @@ static int parse_argv(int argc, char *argv[]) {
case ARG_ICON_NAME:
case ARG_CIFS_USER_NAME:
case ARG_CIFS_DOMAIN:
case ARG_CIFS_EXTRA_MOUNT_OPTIONS: {
case ARG_CIFS_EXTRA_MOUNT_OPTIONS:
case ARG_LUKS_EXTRA_MOUNT_OPTIONS: {
const char *field =
c == ARG_EMAIL_ADDRESS ? "emailAddress" :
@ -2461,6 +2466,7 @@ static int parse_argv(int argc, char *argv[]) {
c == ARG_CIFS_USER_NAME ? "cifsUserName" :
c == ARG_CIFS_DOMAIN ? "cifsDomain" :
c == ARG_CIFS_EXTRA_MOUNT_OPTIONS ? "cifsExtraMountOptions" :
c == ARG_LUKS_EXTRA_MOUNT_OPTIONS ? "luksExtraMountOptions" :
NULL;
assert(field);

16
src/home/homework-luks.c
View file

@ -1352,7 +1352,7 @@ int home_setup_luks(
if (r < 0)
return r;
r = home_unshare_and_mount(setup->dm_node, fstype, user_record_luks_discard(h), user_record_mount_flags(h));
r = home_unshare_and_mount(setup->dm_node, fstype, user_record_luks_discard(h), user_record_mount_flags(h), h->luks_extra_mount_options);
if (r < 0)
return r;
@ -2223,7 +2223,7 @@ int home_create_luks(
log_info("Formatting file system completed.");
r = home_unshare_and_mount(setup->dm_node, fstype, user_record_luks_discard(h), user_record_mount_flags(h));
r = home_unshare_and_mount(setup->dm_node, fstype, user_record_luks_discard(h), user_record_mount_flags(h), h->luks_extra_mount_options);
if (r < 0)
return r;
@ -2413,7 +2413,13 @@ static int can_resize_fs(int fd, uint64_t old_size, uint64_t new_size) {
return CAN_RESIZE_ONLINE;
}
static int ext4_offline_resize_fs(HomeSetup *setup, uint64_t new_size, bool discard, unsigned long flags) {
static int ext4_offline_resize_fs(
HomeSetup *setup,
uint64_t new_size,
bool discard,
unsigned long flags,
const char *extra_mount_options) {
_cleanup_free_ char *size_str = NULL;
bool re_open = false, re_mount = false;
pid_t resize_pid, fsck_pid;
@ -2488,7 +2494,7 @@ static int ext4_offline_resize_fs(HomeSetup *setup, uint64_t new_size, bool disc
/* Re-establish mounts and reopen the directory */
if (re_mount) {
r = home_mount_node(setup->dm_node, "ext4", discard, flags);
r = home_mount_node(setup->dm_node, "ext4", discard, flags, extra_mount_options);
if (r < 0)
return r;
@ -2930,7 +2936,7 @@ int home_resize_luks(
if (r < 0)
return log_error_errno(r, "Failed to resize file system: %m");
} else {
r = ext4_offline_resize_fs(setup, new_fs_size, user_record_luks_discard(h), user_record_mount_flags(h));
r = ext4_offline_resize_fs(setup, new_fs_size, user_record_luks_discard(h), user_record_mount_flags(h), h->luks_extra_mount_options);
if (r < 0)
return r;
}

43
src/home/homework-mount.c
View file

@ -40,28 +40,35 @@ static const char *mount_options_for_fstype(const char *fstype) {
return NULL;
}
int home_mount_node(const char *node, const char *fstype, bool discard, unsigned long flags) {
int home_mount_node(
const char *node,
const char *fstype,
bool discard,
unsigned long flags,
const char *extra_mount_options) {
_cleanup_free_ char *joined = NULL;
const char *options, *discard_option;
const char *default_options;
int r;
assert(node);
assert(fstype);
options = mount_options_for_fstype(fstype);
discard_option = discard ? "discard" : "nodiscard";
if (options) {
joined = strjoin(options, ",", discard_option);
if (!joined)
default_options = mount_options_for_fstype(fstype);
if (default_options) {
if (!strextend_with_separator(&joined, ",", default_options))
return log_oom();
}
options = joined;
} else
options = discard_option;
if (!strextend_with_separator(&joined, ",", discard ? "discard" : "nodiscard"))
return log_oom();
r = mount_nofollow_verbose(LOG_ERR, node, HOME_RUNTIME_WORK_DIR, fstype, flags|MS_RELATIME, strempty(options));
if (extra_mount_options) {
if (!strextend_with_separator(&joined, ",", extra_mount_options))
return log_oom();
}
r = mount_nofollow_verbose(LOG_ERR, node, HOME_RUNTIME_WORK_DIR, fstype, flags|MS_RELATIME, joined);
if (r < 0)
return r;
@ -85,7 +92,13 @@ int home_unshare_and_mkdir(void) {
return 0;
}
int home_unshare_and_mount(const char *node, const char *fstype, bool discard, unsigned long flags) {
int home_unshare_and_mount(
const char *node,
const char *fstype,
bool discard,
unsigned long flags,
const char *extra_mount_options) {
int r;
assert(node);
@ -95,7 +108,7 @@ int home_unshare_and_mount(const char *node, const char *fstype, bool discard, u
if (r < 0)
return r;
r = home_mount_node(node, fstype, discard, flags);
r = home_mount_node(node, fstype, discard, flags, extra_mount_options);
if (r < 0)
return r;

4
src/home/homework-mount.h
View file

@ -3,8 +3,8 @@
#include <stdbool.h>
int home_mount_node(const char *node, const char *fstype, bool discard, unsigned long flags);
int home_mount_node(const char *node, const char *fstype, bool discard, unsigned long flags, const char *extra_mount_options);
int home_unshare_and_mkdir(void);
int home_unshare_and_mount(const char *node, const char *fstype, bool discard, unsigned long flags);
int home_unshare_and_mount(const char *node, const char *fstype, bool discard, unsigned long flags, const char *extra_mount_options);
int home_move_mount(const char *user_name_and_realm, const char *target);
int home_shift_uid(int dir_fd, const char *target, uid_t stored_uid, uid_t exposed_uid, int *ret_mount_fd);

3
src/shared/user-record-show.c
View file

@ -284,6 +284,9 @@ void user_record_show(UserRecord *hr, bool show_full_group_info) {
if (hr->file_system_type)
printf(" File System: %s\n", user_record_file_system_type(hr));
if (hr->luks_extra_mount_options)
printf("LUKS MntOpts: %s\n", hr->luks_extra_mount_options);
if (hr->luks_cipher)
printf(" LUKS Cipher: %s\n", hr->luks_cipher);
if (hr->luks_cipher_mode)

3
src/shared/user-record.c
View file

@ -285,6 +285,7 @@ static UserRecord* user_record_free(UserRecord *h) {
free(h->luks_cipher_mode);
free(h->luks_pbkdf_hash_algorithm);
free(h->luks_pbkdf_type);
free(h->luks_extra_mount_options);
free(h->state);
free(h->service);
@ -1287,6 +1288,7 @@ static int dispatch_per_machine(const char *name, JsonVariant *variant, JsonDisp
{ "luksPbkdfTimeCostUSec", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(UserRecord, luks_pbkdf_time_cost_usec), 0 },
{ "luksPbkdfMemoryCost", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(UserRecord, luks_pbkdf_memory_cost), 0 },
{ "luksPbkdfParallelThreads", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(UserRecord, luks_pbkdf_parallel_threads), 0 },
{ "luksExtraMountOptions", JSON_VARIANT_STRING, json_dispatch_string, offsetof(UserRecord, luks_extra_mount_options), 0 },
{ "dropCaches", JSON_VARIANT_BOOLEAN, json_dispatch_tristate, offsetof(UserRecord, drop_caches), 0 },
{ "rateLimitIntervalUSec", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(UserRecord, ratelimit_interval_usec), 0 },
{ "rateLimitBurst", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(UserRecord, ratelimit_burst), 0 },
@ -1634,6 +1636,7 @@ int user_record_load(UserRecord *h, JsonVariant *v, UserRecordLoadFlags load_fla
{ "luksPbkdfTimeCostUSec", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(UserRecord, luks_pbkdf_time_cost_usec), 0 },
{ "luksPbkdfMemoryCost", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(UserRecord, luks_pbkdf_memory_cost), 0 },
{ "luksPbkdfParallelThreads", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(UserRecord, luks_pbkdf_parallel_threads), 0 },
{ "luksExtraMountOptions", JSON_VARIANT_STRING, json_dispatch_string, offsetof(UserRecord, luks_extra_mount_options), 0 },
{ "dropCaches", JSON_VARIANT_BOOLEAN, json_dispatch_tristate, offsetof(UserRecord, drop_caches), 0 },
{ "service", JSON_VARIANT_STRING, json_dispatch_string, offsetof(UserRecord, service), JSON_SAFE },
{ "rateLimitIntervalUSec", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(UserRecord, ratelimit_interval_usec), 0 },

1
src/shared/user-record.h
View file

@ -331,6 +331,7 @@ typedef struct UserRecord {
uint64_t luks_pbkdf_time_cost_usec;
uint64_t luks_pbkdf_memory_cost;
uint64_t luks_pbkdf_parallel_threads;
char *luks_extra_mount_options;
uint64_t disk_usage;
uint64_t disk_free;