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src.rivoreo.one / systemd-stable / refs/heads/v245-stable / . / src / home / homed-home.c
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/* SPDX-License-Identifier: LGPL-2.1+ */
#if HAVE_LINUX_MEMFD_H
#include <linux/memfd.h>
#endif
#include <sys/mman.h>
#include <sys/quota.h>
#include <sys/vfs.h>
#include "blockdev-util.h"
#include "btrfs-util.h"
#include "bus-common-errors.h"
#include "env-util.h"
#include "errno-list.h"
#include "errno-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "home-util.h"
#include "homed-home-bus.h"
#include "homed-home.h"
#include "missing_syscall.h"
#include "mkdir.h"
#include "path-util.h"
#include "process-util.h"
#include "pwquality-util.h"
#include "quota-util.h"
#include "resize-fs.h"
#include "set.h"
#include "signal-util.h"
#include "stat-util.h"
#include "string-table.h"
#include "strv.h"
#include "user-record-sign.h"
#include "user-record-util.h"
#include "user-record.h"
#include "user-util.h"
#define HOME_USERS_MAX 500
#define PENDING_OPERATIONS_MAX 100
assert_cc(HOME_UID_MIN <= HOME_UID_MAX);
assert_cc(HOME_USERS_MAX <= (HOME_UID_MAX - HOME_UID_MIN + 1));
static int home_start_work(Home *h, const char *verb, UserRecord *hr, UserRecord *secret);
DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(operation_hash_ops, void, trivial_hash_func, trivial_compare_func, Operation, operation_unref);
static int suitable_home_record(UserRecord *hr) {
int r;
assert(hr);
if (!hr->user_name)
return -EUNATCH;
/* We are a bit more restrictive with what we accept as homed-managed user than what we accept in
* home records in general. Let's enforce the stricter rule here. */
if (!suitable_user_name(hr->user_name))
return -EINVAL;
if (!uid_is_valid(hr->uid))
return -EINVAL;
/* Insist we are outside of the dynamic and system range */
if (uid_is_system(hr->uid) || gid_is_system(user_record_gid(hr)) ||
uid_is_dynamic(hr->uid) || gid_is_dynamic(user_record_gid(hr)))
return -EADDRNOTAVAIL;
/* Insist that GID and UID match */
if (user_record_gid(hr) != (gid_t) hr->uid)
return -EBADSLT;
/* Similar for the realm */
if (hr->realm) {
r = suitable_realm(hr->realm);
if (r < 0)
return r;
if (r == 0)
return -EINVAL;
}
return 0;
}
int home_new(Manager *m, UserRecord *hr, const char *sysfs, Home **ret) {
_cleanup_(home_freep) Home *home = NULL;
_cleanup_free_ char *nm = NULL, *ns = NULL;
int r;
assert(m);
assert(hr);
r = suitable_home_record(hr);
if (r < 0)
return r;
if (hashmap_contains(m->homes_by_name, hr->user_name))
return -EBUSY;
if (hashmap_contains(m->homes_by_uid, UID_TO_PTR(hr->uid)))
return -EBUSY;
if (sysfs && hashmap_contains(m->homes_by_sysfs, sysfs))
return -EBUSY;
if (hashmap_size(m->homes_by_name) >= HOME_USERS_MAX)
return -EUSERS;
nm = strdup(hr->user_name);
if (!nm)
return -ENOMEM;
if (sysfs) {
ns = strdup(sysfs);
if (!ns)
return -ENOMEM;
}
home = new(Home, 1);
if (!home)
return -ENOMEM;
*home = (Home) {
.manager = m,
.user_name = TAKE_PTR(nm),
.uid = hr->uid,
.state = _HOME_STATE_INVALID,
.worker_stdout_fd = -1,
.sysfs = TAKE_PTR(ns),
.signed_locally = -1,
};
r = hashmap_put(m->homes_by_name, home->user_name, home);
if (r < 0)
return r;
r = hashmap_put(m->homes_by_uid, UID_TO_PTR(home->uid), home);
if (r < 0)
return r;
if (home->sysfs) {
r = hashmap_put(m->homes_by_sysfs, home->sysfs, home);
if (r < 0)
return r;
}
r = user_record_clone(hr, USER_RECORD_LOAD_MASK_SECRET, &home->record);
if (r < 0)
return r;
(void) bus_manager_emit_auto_login_changed(m);
(void) bus_home_emit_change(home);
if (ret)
*ret = TAKE_PTR(home);
else
TAKE_PTR(home);
return 0;
}
Home *home_free(Home *h) {
if (!h)
return NULL;
if (h->manager) {
(void) bus_home_emit_remove(h);
(void) bus_manager_emit_auto_login_changed(h->manager);
if (h->user_name)
(void) hashmap_remove_value(h->manager->homes_by_name, h->user_name, h);
if (uid_is_valid(h->uid))
(void) hashmap_remove_value(h->manager->homes_by_uid, UID_TO_PTR(h->uid), h);
if (h->sysfs)
(void) hashmap_remove_value(h->manager->homes_by_sysfs, h->sysfs, h);
if (h->worker_pid > 0)
(void) hashmap_remove_value(h->manager->homes_by_worker_pid, PID_TO_PTR(h->worker_pid), h);
if (h->manager->gc_focus == h)
h->manager->gc_focus = NULL;
}
user_record_unref(h->record);
user_record_unref(h->secret);
h->worker_event_source = sd_event_source_unref(h->worker_event_source);
safe_close(h->worker_stdout_fd);
free(h->user_name);
free(h->sysfs);
h->ref_event_source_please_suspend = sd_event_source_unref(h->ref_event_source_please_suspend);
h->ref_event_source_dont_suspend = sd_event_source_unref(h->ref_event_source_dont_suspend);
h->pending_operations = ordered_set_free(h->pending_operations);
h->pending_event_source = sd_event_source_unref(h->pending_event_source);
h->deferred_change_event_source = sd_event_source_unref(h->deferred_change_event_source);
h->current_operation = operation_unref(h->current_operation);
return mfree(h);
}
int home_set_record(Home *h, UserRecord *hr) {
_cleanup_(user_record_unrefp) UserRecord *new_hr = NULL;
Home *other;
int r;
assert(h);
assert(h->user_name);
assert(h->record);
assert(hr);
if (user_record_equal(h->record, hr))
return 0;
r = suitable_home_record(hr);
if (r < 0)
return r;
if (!user_record_compatible(h->record, hr))
return -EREMCHG;
if (!FLAGS_SET(hr->mask, USER_RECORD_REGULAR) ||
FLAGS_SET(hr->mask, USER_RECORD_SECRET))
return -EINVAL;
if (FLAGS_SET(h->record->mask, USER_RECORD_STATUS)) {
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
/* Hmm, the existing record has status fields? If so, copy them over */
v = json_variant_ref(hr->json);
r = json_variant_set_field(&v, "status", json_variant_by_key(h->record->json, "status"));
if (r < 0)
return r;
new_hr = user_record_new();
if (!new_hr)
return -ENOMEM;
r = user_record_load(new_hr, v, USER_RECORD_LOAD_REFUSE_SECRET);
if (r < 0)
return r;
hr = new_hr;
}
other = hashmap_get(h->manager->homes_by_uid, UID_TO_PTR(hr->uid));
if (other && other != h)
return -EBUSY;
if (h->uid != hr->uid) {
r = hashmap_remove_and_replace(h->manager->homes_by_uid, UID_TO_PTR(h->uid), UID_TO_PTR(hr->uid), h);
if (r < 0)
return r;
}
user_record_unref(h->record);
h->record = user_record_ref(hr);
h->uid = h->record->uid;
/* The updated record might have a different autologin setting, trigger a PropertiesChanged event for it */
(void) bus_manager_emit_auto_login_changed(h->manager);
(void) bus_home_emit_change(h);
return 0;
}
int home_save_record(Home *h) {
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
_cleanup_free_ char *text = NULL;
const char *fn;
int r;
assert(h);
v = json_variant_ref(h->record->json);
r = json_variant_normalize(&v);
if (r < 0)
log_warning_errno(r, "User record could not be normalized.");
r = json_variant_format(v, JSON_FORMAT_PRETTY|JSON_FORMAT_NEWLINE, &text);
if (r < 0)
return r;
(void) mkdir("/var/lib/systemd/", 0755);
(void) mkdir("/var/lib/systemd/home/", 0700);
fn = strjoina("/var/lib/systemd/home/", h->user_name, ".identity");
r = write_string_file(fn, text, WRITE_STRING_FILE_ATOMIC|WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_MODE_0600|WRITE_STRING_FILE_SYNC);
if (r < 0)
return r;
return 0;
}
int home_unlink_record(Home *h) {
const char *fn;
assert(h);
fn = strjoina("/var/lib/systemd/home/", h->user_name, ".identity");
if (unlink(fn) < 0 && errno != ENOENT)
return -errno;
fn = strjoina("/run/systemd/home/", h->user_name, ".ref");
if (unlink(fn) < 0 && errno != ENOENT)
return -errno;
return 0;
}
static void home_set_state(Home *h, HomeState state) {
HomeState old_state, new_state;
assert(h);
old_state = home_get_state(h);
h->state = state;
new_state = home_get_state(h); /* Query the new state, since the 'state' variable might be set to -1,
* in which case we synthesize an high-level state on demand */
log_info("%s: changing state %s → %s", h->user_name,
home_state_to_string(old_state),
home_state_to_string(new_state));
if (HOME_STATE_IS_EXECUTING_OPERATION(old_state) && !HOME_STATE_IS_EXECUTING_OPERATION(new_state)) {
/* If we just finished executing some operation, process the queue of pending operations. And
* enqueue it for GC too. */
home_schedule_operation(h, NULL, NULL);
manager_enqueue_gc(h->manager, h);
}
}
static int home_parse_worker_stdout(int _fd, UserRecord **ret) {
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
_cleanup_close_ int fd = _fd; /* take possession, even on failure */
_cleanup_(user_record_unrefp) UserRecord *hr = NULL;
_cleanup_fclose_ FILE *f = NULL;
unsigned line, column;
struct stat st;
int r;
if (fstat(fd, &st) < 0)
return log_error_errno(errno, "Failed to stat stdout fd: %m");
assert(S_ISREG(st.st_mode));
if (st.st_size == 0) { /* empty record */
*ret = NULL;
return 0;
}
if (lseek(fd, SEEK_SET, 0) == (off_t) -1)
return log_error_errno(errno, "Failed to seek to beginning of memfd: %m");
f = fdopen(fd, "r");
if (!f)
return log_error_errno(errno, "Failed to reopen memfd: %m");
TAKE_FD(fd);
if (DEBUG_LOGGING) {
_cleanup_free_ char *text = NULL;
r = read_full_stream(f, &text, NULL);
if (r < 0)
return log_error_errno(r, "Failed to read from client: %m");
log_debug("Got from worker: %s", text);
rewind(f);
}
r = json_parse_file(f, "stdout", JSON_PARSE_SENSITIVE, &v, &line, &column);
if (r < 0)
return log_error_errno(r, "Failed to parse identity at %u:%u: %m", line, column);
hr = user_record_new();
if (!hr)
return log_oom();
r = user_record_load(hr, v, USER_RECORD_LOAD_REFUSE_SECRET);
if (r < 0)
return log_error_errno(r, "Failed to load home record identity: %m");
*ret = TAKE_PTR(hr);
return 1;
}
static int home_verify_user_record(Home *h, UserRecord *hr, bool *ret_signed_locally, sd_bus_error *ret_error) {
int is_signed;
assert(h);
assert(hr);
assert(ret_signed_locally);
is_signed = manager_verify_user_record(h->manager, hr);
switch (is_signed) {
case USER_RECORD_SIGNED_EXCLUSIVE:
log_info("Home %s is signed exclusively by our key, accepting.", hr->user_name);
*ret_signed_locally = true;
return 0;
case USER_RECORD_SIGNED:
log_info("Home %s is signed by our key (and others), accepting.", hr->user_name);
*ret_signed_locally = false;
return 0;
case USER_RECORD_FOREIGN:
log_info("Home %s is signed by foreign key we like, accepting.", hr->user_name);
*ret_signed_locally = false;
return 0;
case USER_RECORD_UNSIGNED:
sd_bus_error_setf(ret_error, BUS_ERROR_BAD_SIGNATURE, "User record %s is not signed at all, refusing.", hr->user_name);
return log_error_errno(SYNTHETIC_ERRNO(EPERM), "Home %s contains user record that is not signed at all, refusing.", hr->user_name);
case -ENOKEY:
sd_bus_error_setf(ret_error, BUS_ERROR_BAD_SIGNATURE, "User record %s is not signed by any known key, refusing.", hr->user_name);
return log_error_errno(is_signed, "Home %s contains user record that is not signed by any known key, refusing.", hr->user_name);
default:
assert(is_signed < 0);
return log_error_errno(is_signed, "Failed to verify signature on user record for %s, refusing fixation: %m", hr->user_name);
}
}
static int convert_worker_errno(Home *h, int e, sd_bus_error *error) {
/* Converts the error numbers the worker process returned into somewhat sensible dbus errors */
switch (e) {
case -EMSGSIZE:
return sd_bus_error_setf(error, BUS_ERROR_BAD_HOME_SIZE, "File systems of this type cannot be shrinked");
case -ETXTBSY:
return sd_bus_error_setf(error, BUS_ERROR_BAD_HOME_SIZE, "File systems of this type can only be shrinked offline");
case -ERANGE:
return sd_bus_error_setf(error, BUS_ERROR_BAD_HOME_SIZE, "File system size too small");
case -ENOLINK:
return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "System does not support selected storage backend");
case -EPROTONOSUPPORT:
return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "System does not support selected file system");
case -ENOTTY:
return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Operation not supported on storage backend");
case -ESOCKTNOSUPPORT:
return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Operation not supported on file system");
case -ENOKEY:
return sd_bus_error_setf(error, BUS_ERROR_BAD_PASSWORD, "Password for home %s is incorrect or not sufficient for authentication.", h->user_name);
case -EBADSLT:
return sd_bus_error_setf(error, BUS_ERROR_BAD_PASSWORD_AND_NO_TOKEN, "Password for home %s is incorrect or not sufficient, and configured security token not found either.", h->user_name);
case -ENOANO:
return sd_bus_error_setf(error, BUS_ERROR_TOKEN_PIN_NEEDED, "PIN for security token required.");
case -ERFKILL:
return sd_bus_error_setf(error, BUS_ERROR_TOKEN_PROTECTED_AUTHENTICATION_PATH_NEEDED, "Security token requires protected authentication path.");
case -EOWNERDEAD:
return sd_bus_error_setf(error, BUS_ERROR_TOKEN_PIN_LOCKED, "PIN of security token locked.");
case -ENOLCK:
return sd_bus_error_setf(error, BUS_ERROR_TOKEN_BAD_PIN, "Bad PIN of security token.");
case -ETOOMANYREFS:
return sd_bus_error_setf(error, BUS_ERROR_TOKEN_BAD_PIN_FEW_TRIES_LEFT, "Bad PIN of security token, and only a few tries left.");
case -EUCLEAN:
return sd_bus_error_setf(error, BUS_ERROR_TOKEN_BAD_PIN_ONE_TRY_LEFT, "Bad PIN of security token, and only one try left.");
case -EBUSY:
return sd_bus_error_setf(error, BUS_ERROR_HOME_BUSY, "Home %s is currently being used, or an operation on home %s is currently being executed.", h->user_name, h->user_name);
case -ENOEXEC:
return sd_bus_error_setf(error, BUS_ERROR_HOME_NOT_ACTIVE, "Home %s is currently not active", h->user_name);
case -ENOSPC:
return sd_bus_error_setf(error, BUS_ERROR_NO_DISK_SPACE, "Not enough disk space for home %s", h->user_name);
}
return 0;
}
static void home_count_bad_authentication(Home *h, bool save) {
int r;
assert(h);
r = user_record_bad_authentication(h->record);
if (r < 0) {
log_warning_errno(r, "Failed to increase bad authentication counter, ignoring: %m");
return;
}
if (save) {
r = home_save_record(h);
if (r < 0)
log_warning_errno(r, "Failed to write home record to disk, ignoring: %m");
}
}
static void home_fixate_finish(Home *h, int ret, UserRecord *hr) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_(user_record_unrefp) UserRecord *secret = NULL;
bool signed_locally;
int r;
assert(h);
assert(IN_SET(h->state, HOME_FIXATING, HOME_FIXATING_FOR_ACTIVATION, HOME_FIXATING_FOR_ACQUIRE));
secret = TAKE_PTR(h->secret); /* Take possession */
if (ret < 0) {
if (ret == -ENOKEY)
(void) home_count_bad_authentication(h, false);
(void) convert_worker_errno(h, ret, &error);
r = log_error_errno(ret, "Fixation failed: %m");
goto fail;
}
if (!hr) {
r = log_error_errno(SYNTHETIC_ERRNO(EIO), "Did not receive user record from worker process, fixation failed.");
goto fail;
}
r = home_verify_user_record(h, hr, &signed_locally, &error);
if (r < 0)
goto fail;
r = home_set_record(h, hr);
if (r < 0) {
log_error_errno(r, "Failed to update home record: %m");
goto fail;
}
h->signed_locally = signed_locally;
/* When we finished fixating (and don't follow-up with activation), let's count this as good authentication */
if (h->state == HOME_FIXATING) {
r = user_record_good_authentication(h->record);
if (r < 0)
log_warning_errno(r, "Failed to increase good authentication counter, ignoring: %m");
}
r = home_save_record(h);
if (r < 0)
log_warning_errno(r, "Failed to write home record to disk, ignoring: %m");
if (IN_SET(h->state, HOME_FIXATING_FOR_ACTIVATION, HOME_FIXATING_FOR_ACQUIRE)) {
r = home_start_work(h, "activate", h->record, secret);
if (r < 0) {
h->current_operation = operation_result_unref(h->current_operation, r, NULL);
home_set_state(h, _HOME_STATE_INVALID);
} else
home_set_state(h, h->state == HOME_FIXATING_FOR_ACTIVATION ? HOME_ACTIVATING : HOME_ACTIVATING_FOR_ACQUIRE);
return;
}
log_debug("Fixation of %s completed.", h->user_name);
h->current_operation = operation_result_unref(h->current_operation, 0, NULL);
/* Reset the state to "invalid", which makes home_get_state() test if the image exists and returns
* HOME_ABSENT vs. HOME_INACTIVE as necessary. */
home_set_state(h, _HOME_STATE_INVALID);
return;
fail:
/* If fixation fails, we stay in unfixated state! */
h->current_operation = operation_result_unref(h->current_operation, r, &error);
home_set_state(h, HOME_UNFIXATED);
}
static void home_activate_finish(Home *h, int ret, UserRecord *hr) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
assert(h);
assert(IN_SET(h->state, HOME_ACTIVATING, HOME_ACTIVATING_FOR_ACQUIRE));
if (ret < 0) {
if (ret == -ENOKEY)
home_count_bad_authentication(h, true);
(void) convert_worker_errno(h, ret, &error);
r = log_error_errno(ret, "Activation failed: %m");
goto finish;
}
if (hr) {
bool signed_locally;
r = home_verify_user_record(h, hr, &signed_locally, &error);
if (r < 0)
goto finish;
r = home_set_record(h, hr);
if (r < 0) {
log_error_errno(r, "Failed to update home record, ignoring: %m");
goto finish;
}
h->signed_locally = signed_locally;
r = user_record_good_authentication(h->record);
if (r < 0)
log_warning_errno(r, "Failed to increase good authentication counter, ignoring: %m");
r = home_save_record(h);
if (r < 0)
log_warning_errno(r, "Failed to write home record to disk, ignoring: %m");
}
log_debug("Activation of %s completed.", h->user_name);
r = 0;
finish:
h->current_operation = operation_result_unref(h->current_operation, r, &error);
home_set_state(h, _HOME_STATE_INVALID);
}
static void home_deactivate_finish(Home *h, int ret, UserRecord *hr) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
assert(h);
assert(h->state == HOME_DEACTIVATING);
assert(!hr); /* We don't expect a record on this operation */
if (ret < 0) {
(void) convert_worker_errno(h, ret, &error);
r = log_error_errno(ret, "Deactivation of %s failed: %m", h->user_name);
goto finish;
}
log_debug("Deactivation of %s completed.", h->user_name);
r = 0;
finish:
h->current_operation = operation_result_unref(h->current_operation, r, &error);
home_set_state(h, _HOME_STATE_INVALID);
}
static void home_remove_finish(Home *h, int ret, UserRecord *hr) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
Manager *m;
int r;
assert(h);
assert(h->state == HOME_REMOVING);
assert(!hr); /* We don't expect a record on this operation */
m = h->manager;
if (ret < 0 && ret != -EALREADY) {
(void) convert_worker_errno(h, ret, &error);
r = log_error_errno(ret, "Removing %s failed: %m", h->user_name);
goto fail;
}
/* For a couple of storage types we can't delete the actual data storage when called (such as LUKS on
* partitions like USB sticks, or so). Sometimes these storage locations are among those we normally
* automatically discover in /home or in udev. When such a home is deleted let's hence issue a rescan
* after completion, so that "unfixated" entries are rediscovered. */
if (!IN_SET(user_record_test_image_path(h->record), USER_TEST_UNDEFINED, USER_TEST_ABSENT))
manager_enqueue_rescan(m);
/* The image is now removed from disk. Now also remove our stored record */
r = home_unlink_record(h);
if (r < 0) {
log_error_errno(r, "Removing record file failed: %m");
goto fail;
}
log_debug("Removal of %s completed.", h->user_name);
h->current_operation = operation_result_unref(h->current_operation, 0, NULL);
/* Unload this record from memory too now. */
h = home_free(h);
return;
fail:
h->current_operation = operation_result_unref(h->current_operation, r, &error);
home_set_state(h, _HOME_STATE_INVALID);
}
static void home_create_finish(Home *h, int ret, UserRecord *hr) {
int r;
assert(h);
assert(h->state == HOME_CREATING);
if (ret < 0) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
(void) convert_worker_errno(h, ret, &error);
log_error_errno(ret, "Operation on %s failed: %m", h->user_name);
h->current_operation = operation_result_unref(h->current_operation, ret, &error);
if (h->unregister_on_failure) {
(void) home_unlink_record(h);
h = home_free(h);
return;
}
home_set_state(h, _HOME_STATE_INVALID);
return;
}
if (hr) {
r = home_set_record(h, hr);
if (r < 0)
log_warning_errno(r, "Failed to update home record, ignoring: %m");
}
r = home_save_record(h);
if (r < 0)
log_warning_errno(r, "Failed to save record to disk, ignoring: %m");
log_debug("Creation of %s completed.", h->user_name);
h->current_operation = operation_result_unref(h->current_operation, 0, NULL);
home_set_state(h, _HOME_STATE_INVALID);
}
static void home_change_finish(Home *h, int ret, UserRecord *hr) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
assert(h);
if (ret < 0) {
if (ret == -ENOKEY)
(void) home_count_bad_authentication(h, true);
(void) convert_worker_errno(h, ret, &error);
r = log_error_errno(ret, "Change operation failed: %m");
goto finish;
}
if (hr) {
r = home_set_record(h, hr);
if (r < 0)
log_warning_errno(r, "Failed to update home record, ignoring: %m");
else {
r = user_record_good_authentication(h->record);
if (r < 0)
log_warning_errno(r, "Failed to increase good authentication counter, ignoring: %m");
r = home_save_record(h);
if (r < 0)
log_warning_errno(r, "Failed to write home record to disk, ignoring: %m");
}
}
log_debug("Change operation of %s completed.", h->user_name);
r = 0;
finish:
h->current_operation = operation_result_unref(h->current_operation, r, &error);
home_set_state(h, _HOME_STATE_INVALID);
}
static void home_locking_finish(Home *h, int ret, UserRecord *hr) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
assert(h);
assert(h->state == HOME_LOCKING);
if (ret < 0) {
(void) convert_worker_errno(h, ret, &error);
r = log_error_errno(ret, "Locking operation failed: %m");
goto finish;
}
log_debug("Locking operation of %s completed.", h->user_name);
h->current_operation = operation_result_unref(h->current_operation, 0, NULL);
home_set_state(h, HOME_LOCKED);
return;
finish:
/* If a specific home doesn't know the concept of locking, then that's totally OK, don't propagate
* the error if we are executing a LockAllHomes() operation. */
if (h->current_operation->type == OPERATION_LOCK_ALL && r == -ENOTTY)
h->current_operation = operation_result_unref(h->current_operation, 0, NULL);
else
h->current_operation = operation_result_unref(h->current_operation, r, &error);
home_set_state(h, _HOME_STATE_INVALID);
}
static void home_unlocking_finish(Home *h, int ret, UserRecord *hr) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
assert(h);
assert(IN_SET(h->state, HOME_UNLOCKING, HOME_UNLOCKING_FOR_ACQUIRE));
if (ret < 0) {
if (ret == -ENOKEY)
(void) home_count_bad_authentication(h, true);
(void) convert_worker_errno(h, ret, &error);
r = log_error_errno(ret, "Unlocking operation failed: %m");
/* Revert to locked state */
home_set_state(h, HOME_LOCKED);
h->current_operation = operation_result_unref(h->current_operation, r, &error);
return;
}
r = user_record_good_authentication(h->record);
if (r < 0)
log_warning_errno(r, "Failed to increase good authentication counter, ignoring: %m");
else {
r = home_save_record(h);
if (r < 0)
log_warning_errno(r, "Failed to write home record to disk, ignoring: %m");
}
log_debug("Unlocking operation of %s completed.", h->user_name);
h->current_operation = operation_result_unref(h->current_operation, r, &error);
home_set_state(h, _HOME_STATE_INVALID);
return;
}
static void home_authenticating_finish(Home *h, int ret, UserRecord *hr) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
assert(h);
assert(IN_SET(h->state, HOME_AUTHENTICATING, HOME_AUTHENTICATING_WHILE_ACTIVE, HOME_AUTHENTICATING_FOR_ACQUIRE));
if (ret < 0) {
if (ret == -ENOKEY)
(void) home_count_bad_authentication(h, true);
(void) convert_worker_errno(h, ret, &error);
r = log_error_errno(ret, "Authentication failed: %m");
goto finish;
}
if (hr) {
r = home_set_record(h, hr);
if (r < 0)
log_warning_errno(r, "Failed to update home record, ignoring: %m");
else {
r = user_record_good_authentication(h->record);
if (r < 0)
log_warning_errno(r, "Failed to increase good authentication counter, ignoring: %m");
r = home_save_record(h);
if (r < 0)
log_warning_errno(r, "Failed to write home record to disk, ignoring: %m");
}
}
log_debug("Authentication of %s completed.", h->user_name);
r = 0;
finish:
h->current_operation = operation_result_unref(h->current_operation, r, &error);
home_set_state(h, _HOME_STATE_INVALID);
}
static int home_on_worker_process(sd_event_source *s, const siginfo_t *si, void *userdata) {
_cleanup_(user_record_unrefp) UserRecord *hr = NULL;
Home *h = userdata;
int ret;
assert(s);
assert(si);
assert(h);
assert(h->worker_pid == si->si_pid);
assert(h->worker_event_source);
assert(h->worker_stdout_fd >= 0);
(void) hashmap_remove_value(h->manager->homes_by_worker_pid, PID_TO_PTR(h->worker_pid), h);
h->worker_pid = 0;
h->worker_event_source = sd_event_source_unref(h->worker_event_source);
if (si->si_code != CLD_EXITED) {
assert(IN_SET(si->si_code, CLD_KILLED, CLD_DUMPED));
ret = log_debug_errno(SYNTHETIC_ERRNO(EPROTO), "Worker process died abnormally with signal %s.", signal_to_string(si->si_status));
} else if (si->si_status != EXIT_SUCCESS) {
/* If we received an error code via sd_notify(), use it */
if (h->worker_error_code != 0)
ret = log_debug_errno(h->worker_error_code, "Worker reported error code %s.", errno_to_name(h->worker_error_code));
else
ret = log_debug_errno(SYNTHETIC_ERRNO(EPROTO), "Worker exited with exit code %i.", si->si_status);
} else
ret = home_parse_worker_stdout(TAKE_FD(h->worker_stdout_fd), &hr);
h->worker_stdout_fd = safe_close(h->worker_stdout_fd);
switch (h->state) {
case HOME_FIXATING:
case HOME_FIXATING_FOR_ACTIVATION:
case HOME_FIXATING_FOR_ACQUIRE:
home_fixate_finish(h, ret, hr);
break;
case HOME_ACTIVATING:
case HOME_ACTIVATING_FOR_ACQUIRE:
home_activate_finish(h, ret, hr);
break;
case HOME_DEACTIVATING:
home_deactivate_finish(h, ret, hr);
break;
case HOME_LOCKING:
home_locking_finish(h, ret, hr);
break;
case HOME_UNLOCKING:
case HOME_UNLOCKING_FOR_ACQUIRE:
home_unlocking_finish(h, ret, hr);
break;
case HOME_CREATING:
home_create_finish(h, ret, hr);
break;
case HOME_REMOVING:
home_remove_finish(h, ret, hr);
break;
case HOME_UPDATING:
case HOME_UPDATING_WHILE_ACTIVE:
case HOME_RESIZING:
case HOME_RESIZING_WHILE_ACTIVE:
case HOME_PASSWD:
case HOME_PASSWD_WHILE_ACTIVE:
home_change_finish(h, ret, hr);
break;
case HOME_AUTHENTICATING:
case HOME_AUTHENTICATING_WHILE_ACTIVE:
case HOME_AUTHENTICATING_FOR_ACQUIRE:
home_authenticating_finish(h, ret, hr);
break;
default:
assert_not_reached("Unexpected state after worker exited");
}
return 0;
}
static int home_start_work(Home *h, const char *verb, UserRecord *hr, UserRecord *secret) {
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
_cleanup_(erase_and_freep) char *formatted = NULL;
_cleanup_close_ int stdin_fd = -1, stdout_fd = -1;
pid_t pid = 0;
int r;
assert(h);
assert(verb);
assert(hr);
if (h->worker_pid != 0)
return -EBUSY;
assert(h->worker_stdout_fd < 0);
assert(!h->worker_event_source);
v = json_variant_ref(hr->json);
if (secret) {
JsonVariant *sub = NULL;
sub = json_variant_by_key(secret->json, "secret");
if (!sub)
return -ENOKEY;
r = json_variant_set_field(&v, "secret", sub);
if (r < 0)
return r;
}
r = json_variant_format(v, 0, &formatted);
if (r < 0)
return r;
stdin_fd = acquire_data_fd(formatted, strlen(formatted), 0);
if (stdin_fd < 0)
return stdin_fd;
log_debug("Sending to worker: %s", formatted);
stdout_fd = memfd_create("homework-stdout", MFD_CLOEXEC);
if (stdout_fd < 0)
return -errno;
r = safe_fork_full("(sd-homework)",
(int[]) { stdin_fd, stdout_fd }, 2,
FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_LOG, &pid);
if (r < 0)
return r;
if (r == 0) {
/* Child */
if (setenv("NOTIFY_SOCKET", "/run/systemd/home/notify", 1) < 0) {
log_error_errno(errno, "Failed to set $NOTIFY_SOCKET: %m");
_exit(EXIT_FAILURE);
}
r = rearrange_stdio(stdin_fd, stdout_fd, STDERR_FILENO);
if (r < 0) {
log_error_errno(r, "Failed to rearrange stdin/stdout/stderr: %m");
_exit(EXIT_FAILURE);
}
stdin_fd = stdout_fd = -1; /* have been invalidated by rearrange_stdio() */
execl(SYSTEMD_HOMEWORK_PATH, SYSTEMD_HOMEWORK_PATH, verb, NULL);
log_error_errno(errno, "Failed to invoke " SYSTEMD_HOMEWORK_PATH ": %m");
_exit(EXIT_FAILURE);
}
r = sd_event_add_child(h->manager->event, &h->worker_event_source, pid, WEXITED, home_on_worker_process, h);
if (r < 0)
return r;
(void) sd_event_source_set_description(h->worker_event_source, "worker");
r = hashmap_put(h->manager->homes_by_worker_pid, PID_TO_PTR(pid), h);
if (r < 0) {
h->worker_event_source = sd_event_source_unref(h->worker_event_source);
return r;
}
h->worker_stdout_fd = TAKE_FD(stdout_fd);
h->worker_pid = pid;
h->worker_error_code = 0;
return 0;
}
static int home_ratelimit(Home *h, sd_bus_error *error) {
int r, ret;
assert(h);
ret = user_record_ratelimit(h->record);
if (ret < 0)
return ret;
if (h->state != HOME_UNFIXATED) {
r = home_save_record(h);
if (r < 0)
log_warning_errno(r, "Failed to save updated record, ignoring: %m");
}
if (ret == 0) {
char buf[FORMAT_TIMESPAN_MAX];
usec_t t, n;
n = now(CLOCK_REALTIME);
t = user_record_ratelimit_next_try(h->record);
if (t != USEC_INFINITY && t > n)
return sd_bus_error_setf(error, BUS_ERROR_AUTHENTICATION_LIMIT_HIT, "Too many login attempts, please try again in %s!",
format_timespan(buf, sizeof(buf), t - n, USEC_PER_SEC));
return sd_bus_error_setf(error, BUS_ERROR_AUTHENTICATION_LIMIT_HIT, "Too many login attempts, please try again later.");
}
return 0;
}
static int home_fixate_internal(
Home *h,
UserRecord *secret,
HomeState for_state,
sd_bus_error *error) {
int r;
assert(h);
assert(IN_SET(for_state, HOME_FIXATING, HOME_FIXATING_FOR_ACTIVATION, HOME_FIXATING_FOR_ACQUIRE));
r = home_start_work(h, "inspect", h->record, secret);
if (r < 0)
return r;
if (IN_SET(for_state, HOME_FIXATING_FOR_ACTIVATION, HOME_FIXATING_FOR_ACQUIRE)) {
/* Remember the secret data, since we need it for the activation again, later on. */
user_record_unref(h->secret);
h->secret = user_record_ref(secret);
}
home_set_state(h, for_state);
return 0;
}
int home_fixate(Home *h, UserRecord *secret, sd_bus_error *error) {
int r;
assert(h);
switch (home_get_state(h)) {
case HOME_ABSENT:
return sd_bus_error_setf(error, BUS_ERROR_HOME_ABSENT, "Home %s is currently missing or not plugged in.", h->user_name);
case HOME_INACTIVE:
case HOME_ACTIVE:
case HOME_LOCKED:
return sd_bus_error_setf(error, BUS_ERROR_HOME_ALREADY_FIXATED, "Home %s is already fixated.", h->user_name);
case HOME_UNFIXATED:
break;
default:
return sd_bus_error_setf(error, BUS_ERROR_HOME_BUSY, "An operation on home %s is currently being executed.", h->user_name);
}
r = home_ratelimit(h, error);
if (r < 0)
return r;
return home_fixate_internal(h, secret, HOME_FIXATING, error);
}
static int home_activate_internal(Home *h, UserRecord *secret, HomeState for_state, sd_bus_error *error) {
int r;
assert(h);
assert(IN_SET(for_state, HOME_ACTIVATING, HOME_ACTIVATING_FOR_ACQUIRE));
r = home_start_work(h, "activate", h->record, secret);
if (r < 0)
return r;
home_set_state(h, for_state);
return 0;
}
int home_activate(Home *h, UserRecord *secret, sd_bus_error *error) {
int r;
assert(h);
switch (home_get_state(h)) {
case HOME_UNFIXATED:
return home_fixate_internal(h, secret, HOME_FIXATING_FOR_ACTIVATION, error);
case HOME_ABSENT:
return sd_bus_error_setf(error, BUS_ERROR_HOME_ABSENT, "Home %s is currently missing or not plugged in.", h->user_name);
case HOME_ACTIVE:
return sd_bus_error_setf(error, BUS_ERROR_HOME_ALREADY_ACTIVE, "Home %s is already active.", h->user_name);
case HOME_LOCKED:
return sd_bus_error_setf(error, BUS_ERROR_HOME_LOCKED, "Home %s is currently locked.", h->user_name);
case HOME_INACTIVE:
break;
default:
return sd_bus_error_setf(error, BUS_ERROR_HOME_BUSY, "An operation on home %s is currently being executed.", h->user_name);
}
r = home_ratelimit(h, error);
if (r < 0)
return r;
return home_activate_internal(h, secret, HOME_ACTIVATING, error);
}
static int home_authenticate_internal(Home *h, UserRecord *secret, HomeState for_state, sd_bus_error *error) {
int r;
assert(h);
assert(IN_SET(for_state, HOME_AUTHENTICATING, HOME_AUTHENTICATING_WHILE_ACTIVE, HOME_AUTHENTICATING_FOR_ACQUIRE));
r = home_start_work(h, "inspect", h->record, secret);
if (r < 0)
return r;
home_set_state(h, for_state);
return 0;
}
int home_authenticate(Home *h, UserRecord *secret, sd_bus_error *error) {
HomeState state;
int r;
assert(h);
state = home_get_state(h);
switch (state) {
case HOME_ABSENT:
return sd_bus_error_setf(error, BUS_ERROR_HOME_ABSENT, "Home %s is currently missing or not plugged in.", h->user_name);
case HOME_LOCKED:
return sd_bus_error_setf(error, BUS_ERROR_HOME_LOCKED, "Home %s is currently locked.", h->user_name);
case HOME_UNFIXATED:
case HOME_INACTIVE:
case HOME_ACTIVE:
break;
default:
return sd_bus_error_setf(error, BUS_ERROR_HOME_BUSY, "An operation on home %s is currently being executed.", h->user_name);
}
r = home_ratelimit(h, error);
if (r < 0)
return r;
return home_authenticate_internal(h, secret, state == HOME_ACTIVE ? HOME_AUTHENTICATING_WHILE_ACTIVE : HOME_AUTHENTICATING, error);
}
static int home_deactivate_internal(Home *h, bool force, sd_bus_error *error) {
int r;
assert(h);
r = home_start_work(h, force ? "deactivate-force" : "deactivate", h->record, NULL);
if (r < 0)
return r;
home_set_state(h, HOME_DEACTIVATING);
return 0;
}
int home_deactivate(Home *h, bool force, sd_bus_error *error) {
assert(h);
switch (home_get_state(h)) {
case HOME_UNFIXATED:
case HOME_ABSENT:
case HOME_INACTIVE:
return sd_bus_error_setf(error, BUS_ERROR_HOME_NOT_ACTIVE, "Home %s not active.", h->user_name);
case HOME_LOCKED:
return sd_bus_error_setf(error, BUS_ERROR_HOME_LOCKED, "Home %s is currently locked.", h->user_name);
case HOME_ACTIVE:
break;
default:
return sd_bus_error_setf(error, BUS_ERROR_HOME_BUSY, "An operation on home %s is currently being executed.", h->user_name);
}
return home_deactivate_internal(h, force, error);
}
int home_create(Home *h, UserRecord *secret, sd_bus_error *error) {
int r;
assert(h);
switch (home_get_state(h)) {
case HOME_INACTIVE: {
int t;
if (h->record->storage < 0)
break; /* if no storage is defined we don't know what precisely to look for, hence
* HOME_INACTIVE is OK in that case too. */
t = user_record_test_image_path(h->record);
if (IN_SET(t, USER_TEST_MAYBE, USER_TEST_UNDEFINED))
break; /* And if the image path test isn't conclusive, let's also go on */
if (IN_SET(t, -EBADFD, -ENOTDIR))
return sd_bus_error_setf(error, BUS_ERROR_HOME_EXISTS, "Selected home image of user %s already exists or has wrong inode type.", h->user_name);
return sd_bus_error_setf(error, BUS_ERROR_HOME_EXISTS, "Selected home image of user %s already exists.", h->user_name);
}
case HOME_UNFIXATED:
return sd_bus_error_setf(error, BUS_ERROR_HOME_EXISTS, "Home of user %s already exists.", h->user_name);
case HOME_ABSENT:
break;
case HOME_ACTIVE:
case HOME_LOCKED:
default:
return sd_bus_error_setf(error, BUS_ERROR_HOME_BUSY, "Home %s is currently being used, or an operation on home %s is currently being executed.", h->user_name, h->user_name);
}
if (h->record->enforce_password_policy == false)
log_debug("Password quality check turned off for account, skipping.");
else {
r = quality_check_password(h->record, secret, error);
if (r < 0)
return r;
}
r = home_start_work(h, "create", h->record, secret);
if (r < 0)
return r;
home_set_state(h, HOME_CREATING);
return 0;
}
int home_remove(Home *h, sd_bus_error *error) {
HomeState state;
int r;
assert(h);
state = home_get_state(h);
switch (state) {
case HOME_ABSENT: /* If the home directory is absent, then this is just like unregistering */
return home_unregister(h, error);
case HOME_LOCKED:
return sd_bus_error_setf(error, BUS_ERROR_HOME_LOCKED, "Home %s is currently locked.", h->user_name);
case HOME_UNFIXATED:
case HOME_INACTIVE:
break;
case HOME_ACTIVE:
default:
return sd_bus_error_setf(error, BUS_ERROR_HOME_BUSY, "Home %s is currently being used, or an operation on home %s is currently being executed.", h->user_name, h->user_name);
}
r = home_start_work(h, "remove", h->record, NULL);
if (r < 0)
return r;
home_set_state(h, HOME_REMOVING);
return 0;
}
static int user_record_extend_with_binding(UserRecord *hr, UserRecord *with_binding, UserRecordLoadFlags flags, UserRecord **ret) {
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
_cleanup_(user_record_unrefp) UserRecord *nr = NULL;
JsonVariant *binding;
int r;
assert(hr);
assert(with_binding);
assert(ret);
assert_se(v = json_variant_ref(hr->json));
binding = json_variant_by_key(with_binding->json, "binding");
if (binding) {
r = json_variant_set_field(&v, "binding", binding);
if (r < 0)
return r;
}
nr = user_record_new();
if (!nr)
return -ENOMEM;
r = user_record_load(nr, v, flags);
if (r < 0)
return r;
*ret = TAKE_PTR(nr);
return 0;
}
static int home_update_internal(Home *h, const char *verb, UserRecord *hr, UserRecord *secret, sd_bus_error *error) {
_cleanup_(user_record_unrefp) UserRecord *new_hr = NULL, *saved_secret = NULL, *signed_hr = NULL;
int r, c;
assert(h);
assert(verb);
assert(hr);
if (!user_record_compatible(hr, h->record))
return sd_bus_error_setf(error, BUS_ERROR_HOME_RECORD_MISMATCH, "Updated user record is not compatible with existing one.");
c = user_record_compare_last_change(hr, h->record); /* refuse downgrades */
if (c < 0)
return sd_bus_error_setf(error, BUS_ERROR_HOME_RECORD_DOWNGRADE, "Refusing to update to older home record.");
if (!secret && FLAGS_SET(hr->mask, USER_RECORD_SECRET)) {
r = user_record_clone(hr, USER_RECORD_EXTRACT_SECRET, &saved_secret);
if (r < 0)
return r;
secret = saved_secret;
}
r = manager_verify_user_record(h->manager, hr);
switch (r) {
case USER_RECORD_UNSIGNED:
if (h->signed_locally <= 0) /* If the existing record is not owned by us, don't accept an
* unsigned new record. i.e. only implicitly sign new records
* that where previously signed by us too. */
return sd_bus_error_setf(error, BUS_ERROR_HOME_RECORD_SIGNED, "Home %s is signed and cannot be modified locally.", h->user_name);
/* The updated record is not signed, then do so now */
r = manager_sign_user_record(h->manager, hr, &signed_hr, error);
if (r < 0)
return r;
hr = signed_hr;
break;
case USER_RECORD_SIGNED_EXCLUSIVE:
case USER_RECORD_SIGNED:
case USER_RECORD_FOREIGN:
/* Has already been signed. Great! */
break;
case -ENOKEY:
default:
return r;
}
r = user_record_extend_with_binding(hr, h->record, USER_RECORD_LOAD_MASK_SECRET, &new_hr);
if (r < 0)
return r;
if (c == 0) {
/* different payload but same lastChangeUSec field? That's not cool! */
r = user_record_masked_equal(new_hr, h->record, USER_RECORD_REGULAR|USER_RECORD_PRIVILEGED|USER_RECORD_PER_MACHINE);
if (r < 0)
return r;
if (r == 0)
return sd_bus_error_setf(error, BUS_ERROR_HOME_RECORD_MISMATCH, "Home record different but timestamp remained the same, refusing.");
}
r = home_start_work(h, verb, new_hr, secret);
if (r < 0)
return r;
return 0;
}
int home_update(Home *h, UserRecord *hr, sd_bus_error *error) {
HomeState state;
int r;
assert(h);
assert(hr);
state = home_get_state(h);
switch (state) {
case HOME_UNFIXATED:
return sd_bus_error_setf(error, BUS_ERROR_HOME_UNFIXATED, "Home %s has not been fixated yet.", h->user_name);
case HOME_ABSENT:
return sd_bus_error_setf(error, BUS_ERROR_HOME_ABSENT, "Home %s is currently missing or not plugged in.", h->user_name);
case HOME_LOCKED:
return sd_bus_error_setf(error, BUS_ERROR_HOME_LOCKED, "Home %s is currently locked.", h->user_name);
case HOME_INACTIVE:
case HOME_ACTIVE:
break;
default:
return sd_bus_error_setf(error, BUS_ERROR_HOME_BUSY, "An operation on home %s is currently being executed.", h->user_name);
}
r = home_ratelimit(h, error);
if (r < 0)
return r;
r = home_update_internal(h, "update", hr, NULL, error);
if (r < 0)
return r;
home_set_state(h, state == HOME_ACTIVE ? HOME_UPDATING_WHILE_ACTIVE : HOME_UPDATING);
return 0;
}
int home_resize(Home *h, uint64_t disk_size, UserRecord *secret, sd_bus_error *error) {
_cleanup_(user_record_unrefp) UserRecord *c = NULL;
HomeState state;
int r;
assert(h);
state = home_get_state(h);
switch (state) {
case HOME_UNFIXATED:
return sd_bus_error_setf(error, BUS_ERROR_HOME_UNFIXATED, "Home %s has not been fixated yet.", h->user_name);
case HOME_ABSENT:
return sd_bus_error_setf(error, BUS_ERROR_HOME_ABSENT, "Home %s is currently missing or not plugged in.", h->user_name);
case HOME_LOCKED:
return sd_bus_error_setf(error, BUS_ERROR_HOME_LOCKED, "Home %s is currently locked.", h->user_name);
case HOME_INACTIVE:
case HOME_ACTIVE:
break;
default:
return sd_bus_error_setf(error, BUS_ERROR_HOME_BUSY, "An operation on home %s is currently being executed.", h->user_name);
}
r = home_ratelimit(h, error);
if (r < 0)
return r;
if (disk_size == UINT64_MAX || disk_size == h->record->disk_size) {
if (h->record->disk_size == UINT64_MAX)
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "No disk size to resize to specified.");
c = user_record_ref(h->record); /* Shortcut if size is unspecified or matches the record */
} else {
_cleanup_(user_record_unrefp) UserRecord *signed_c = NULL;
if (h->signed_locally <= 0) /* Don't allow changing of records not signed only by us */
return sd_bus_error_setf(error, BUS_ERROR_HOME_RECORD_SIGNED, "Home %s is signed and cannot be modified locally.", h->user_name);
r = user_record_clone(h->record, USER_RECORD_LOAD_REFUSE_SECRET, &c);
if (r < 0)
return r;
r = user_record_set_disk_size(c, disk_size);
if (r == -ERANGE)
return sd_bus_error_setf(error, BUS_ERROR_BAD_HOME_SIZE, "Requested size for home %s out of acceptable range.", h->user_name);
if (r < 0)
return r;
r = user_record_update_last_changed(c, false);
if (r == -ECHRNG)
return sd_bus_error_setf(error, BUS_ERROR_HOME_RECORD_MISMATCH, "Record last change time of %s is newer than current time, cannot update.", h->user_name);
if (r < 0)
return r;
r = manager_sign_user_record(h->manager, c, &signed_c, error);
if (r < 0)
return r;
user_record_unref(c);
c = TAKE_PTR(signed_c);
}
r = home_update_internal(h, "resize", c, secret, error);
if (r < 0)
return r;
home_set_state(h, state == HOME_ACTIVE ? HOME_RESIZING_WHILE_ACTIVE : HOME_RESIZING);
return 0;
}
static int home_may_change_password(
Home *h,
sd_bus_error *error) {
int r;
assert(h);
r = user_record_test_password_change_required(h->record);
if (IN_SET(r, -EKEYREVOKED, -EOWNERDEAD, -EKEYEXPIRED, -ESTALE))
return 0; /* expired in some form, but changing is allowed */
if (IN_SET(r, -EKEYREJECTED, -EROFS))
return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Expiration settings of account %s do not allow changing of password.", h->user_name);
if (r < 0)
return log_error_errno(r, "Failed to test password expiry: %m");
return 0; /* not expired */
}
int home_passwd(Home *h,
UserRecord *new_secret,
UserRecord *old_secret,
sd_bus_error *error) {
_cleanup_(user_record_unrefp) UserRecord *c = NULL, *merged_secret = NULL, *signed_c = NULL;
HomeState state;
int r;
assert(h);
if (h->signed_locally <= 0) /* Don't allow changing of records not signed only by us */
return sd_bus_error_setf(error, BUS_ERROR_HOME_RECORD_SIGNED, "Home %s is signed and cannot be modified locally.", h->user_name);
state = home_get_state(h);
switch (state) {
case HOME_UNFIXATED:
return sd_bus_error_setf(error, BUS_ERROR_HOME_UNFIXATED, "Home %s has not been fixated yet.", h->user_name);
case HOME_ABSENT:
return sd_bus_error_setf(error, BUS_ERROR_HOME_ABSENT, "Home %s is currently missing or not plugged in.", h->user_name);
case HOME_LOCKED:
return sd_bus_error_setf(error, BUS_ERROR_HOME_LOCKED, "Home %s is currently locked.", h->user_name);
case HOME_INACTIVE:
case HOME_ACTIVE:
break;
default:
return sd_bus_error_setf(error, BUS_ERROR_HOME_BUSY, "An operation on home %s is currently being executed.", h->user_name);
}
r = home_ratelimit(h, error);
if (r < 0)
return r;
r = home_may_change_password(h, error);
if (r < 0)
return r;
r = user_record_clone(h->record, USER_RECORD_LOAD_REFUSE_SECRET, &c);
if (r < 0)
return r;
merged_secret = user_record_new();
if (!merged_secret)
return -ENOMEM;
r = user_record_merge_secret(merged_secret, old_secret);
if (r < 0)
return r;
r = user_record_merge_secret(merged_secret, new_secret);
if (r < 0)
return r;
if (!strv_isempty(new_secret->password)) {
/* Update the password only if one is specified, otherwise let's just reuse the old password
* data. This is useful as a way to propagate updated user records into the LUKS backends
* properly. */
r = user_record_make_hashed_password(c, new_secret->password, /* extend = */ false);
if (r < 0)
return r;
r = user_record_set_password_change_now(c, -1 /* remove */);
if (r < 0)
return r;
}
r = user_record_update_last_changed(c, true);
if (r == -ECHRNG)
return sd_bus_error_setf(error, BUS_ERROR_HOME_RECORD_MISMATCH, "Record last change time of %s is newer than current time, cannot update.", h->user_name);
if (r < 0)
return r;
r = manager_sign_user_record(h->manager, c, &signed_c, error);
if (r < 0)
return r;
if (c->enforce_password_policy == false)
log_debug("Password quality check turned off for account, skipping.");
else {
r = quality_check_password(c, merged_secret, error);
if (r < 0)
return r;
}
r = home_update_internal(h, "passwd", signed_c, merged_secret, error);
if (r < 0)
return r;
home_set_state(h, state == HOME_ACTIVE ? HOME_PASSWD_WHILE_ACTIVE : HOME_PASSWD);
return 0;
}
int home_unregister(Home *h, sd_bus_error *error) {
int r;
assert(h);
switch (home_get_state(h)) {
case HOME_UNFIXATED:
return sd_bus_error_setf(error, BUS_ERROR_HOME_UNFIXATED, "Home %s is not registered.", h->user_name);
case HOME_LOCKED:
return sd_bus_error_setf(error, BUS_ERROR_HOME_LOCKED, "Home %s is currently locked.", h->user_name);
case HOME_ABSENT:
case HOME_INACTIVE:
break;
case HOME_ACTIVE:
default:
return sd_bus_error_setf(error, BUS_ERROR_HOME_BUSY, "Home %s is currently being used, or an operation on home %s is currently being executed.", h->user_name, h->user_name);
}
r = home_unlink_record(h);
if (r < 0)
return r;
/* And destroy the whole entry. The caller needs to be prepared for that. */
h = home_free(h);
return 1;
}
int home_lock(Home *h, sd_bus_error *error) {
int r;
assert(h);
switch (home_get_state(h)) {
case HOME_UNFIXATED:
case HOME_ABSENT:
case HOME_INACTIVE:
return sd_bus_error_setf(error, BUS_ERROR_HOME_NOT_ACTIVE, "Home %s is not active.", h->user_name);
case HOME_LOCKED:
return sd_bus_error_setf(error, BUS_ERROR_HOME_LOCKED, "Home %s is already locked.", h->user_name);
case HOME_ACTIVE:
break;
default:
return sd_bus_error_setf(error, BUS_ERROR_HOME_BUSY, "An operation on home %s is currently being executed.", h->user_name);
}
r = home_start_work(h, "lock", h->record, NULL);
if (r < 0)
return r;
home_set_state(h, HOME_LOCKING);
return 0;
}
static int home_unlock_internal(Home *h, UserRecord *secret, HomeState for_state, sd_bus_error *error) {
int r;
assert(h);
assert(IN_SET(for_state, HOME_UNLOCKING, HOME_UNLOCKING_FOR_ACQUIRE));
r = home_start_work(h, "unlock", h->record, secret);
if (r < 0)
return r;
home_set_state(h, for_state);
return 0;
}
int home_unlock(Home *h, UserRecord *secret, sd_bus_error *error) {
int r;
assert(h);
r = home_ratelimit(h, error);
if (r < 0)
return r;
switch (home_get_state(h)) {
case HOME_UNFIXATED:
case HOME_ABSENT:
case HOME_INACTIVE:
case HOME_ACTIVE:
return sd_bus_error_setf(error, BUS_ERROR_HOME_NOT_LOCKED, "Home %s is not locked.", h->user_name);
case HOME_LOCKED:
break;
default:
return sd_bus_error_setf(error, BUS_ERROR_HOME_BUSY, "An operation on home %s is currently being executed.", h->user_name);
}
return home_unlock_internal(h, secret, HOME_UNLOCKING, error);
}
HomeState home_get_state(Home *h) {
assert(h);
/* When the state field is initialized, it counts. */
if (h->state >= 0)
return h->state;
/* Otherwise, let's see if the home directory is mounted. If so, we assume for sure the home
* directory is active */
if (user_record_test_home_directory(h->record) == USER_TEST_MOUNTED)
return HOME_ACTIVE;
/* And if we see the image being gone, we report this as absent */
if (user_record_test_image_path(h->record) == USER_TEST_ABSENT)
return HOME_ABSENT;
/* And for all other cases we return "inactive". */
return HOME_INACTIVE;
}
void home_process_notify(Home *h, char **l) {
const char *e;
int error;
int r;
assert(h);
e = strv_env_get(l, "ERRNO");
if (!e) {
log_debug("Got notify message lacking ERRNO= field, ignoring.");
return;
}
r = safe_atoi(e, &error);
if (r < 0) {
log_debug_errno(r, "Failed to parse receieved error number, ignoring: %s", e);
return;
}
if (error <= 0) {
log_debug("Error number is out of range: %i", error);
return;
}
h->worker_error_code = error;
}
int home_killall(Home *h) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_free_ char *unit = NULL;
int r;
assert(h);
if (!uid_is_valid(h->uid))
return 0;
assert(h->uid > 0); /* We never should be UID 0 */
/* Let's kill everything matching the specified UID */
r = safe_fork("(sd-killer)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_WAIT|FORK_LOG, NULL);
if (r < 0)
return r;
if (r == 0) {
gid_t gid;
/* Child */
gid = user_record_gid(h->record);
if (setresgid(gid, gid, gid) < 0) {
log_error_errno(errno, "Failed to change GID to " GID_FMT ": %m", gid);
_exit(EXIT_FAILURE);
}
if (setgroups(0, NULL) < 0) {
log_error_errno(errno, "Failed to reset auxiliary groups list: %m");
_exit(EXIT_FAILURE);
}
if (setresuid(h->uid, h->uid, h->uid) < 0) {
log_error_errno(errno, "Failed to change UID to " UID_FMT ": %m", h->uid);
_exit(EXIT_FAILURE);
}
if (kill(-1, SIGKILL) < 0) {
log_error_errno(errno, "Failed to kill all processes of UID " UID_FMT ": %m", h->uid);
_exit(EXIT_FAILURE);
}
_exit(EXIT_SUCCESS);
}
/* Let's also kill everything in the user's slice */
if (asprintf(&unit, "user-" UID_FMT ".slice", h->uid) < 0)
return log_oom();
r = sd_bus_call_method(
h->manager->bus,
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"KillUnit",
&error,
NULL,
"ssi", unit, "all", SIGKILL);
if (r < 0)
log_full_errno(sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_UNIT) ? LOG_DEBUG : LOG_WARNING,
r, "Failed to kill login processes of user, ignoring: %s", bus_error_message(&error, r));
return 1;
}
static int home_get_disk_status_luks(
Home *h,
HomeState state,
uint64_t *ret_disk_size,
uint64_t *ret_disk_usage,
uint64_t *ret_disk_free,
uint64_t *ret_disk_ceiling,
uint64_t *ret_disk_floor) {
uint64_t disk_size = UINT64_MAX, disk_usage = UINT64_MAX, disk_free = UINT64_MAX,
disk_ceiling = UINT64_MAX, disk_floor = UINT64_MAX,
stat_used = UINT64_MAX, fs_size = UINT64_MAX, header_size = 0;
struct statfs sfs;
const char *hd;
int r;
assert(h);
assert(ret_disk_size);
assert(ret_disk_usage);
assert(ret_disk_free);
assert(ret_disk_ceiling);
if (state != HOME_ABSENT) {
const char *ip;
ip = user_record_image_path(h->record);
if (ip) {
struct stat st;
if (stat(ip, &st) < 0)
log_debug_errno(errno, "Failed to stat() %s, ignoring: %m", ip);
else if (S_ISREG(st.st_mode)) {
_cleanup_free_ char *parent = NULL;
disk_size = st.st_size;
stat_used = st.st_blocks * 512;
parent = dirname_malloc(ip);
if (!parent)
return log_oom();
if (statfs(parent, &sfs) < 0)
log_debug_errno(errno, "Failed to statfs() %s, ignoring: %m", parent);
else
disk_ceiling = stat_used + sfs.f_bsize * sfs.f_bavail;
} else if (S_ISBLK(st.st_mode)) {
_cleanup_free_ char *szbuf = NULL;
char p[SYS_BLOCK_PATH_MAX("/size")];
/* Let's read the size off sysfs, so that we don't have to open the device */
xsprintf_sys_block_path(p, "/size", st.st_rdev);
r = read_one_line_file(p, &szbuf);
if (r < 0)
log_debug_errno(r, "Failed to read %s, ignoring: %m", p);
else {
uint64_t sz;
r = safe_atou64(szbuf, &sz);
if (r < 0)
log_debug_errno(r, "Failed to parse %s, ignoring: %s", p, szbuf);
else
disk_size = sz * 512;
}
} else
log_debug("Image path is not a block device or regular file, not able to acquire size.");
}
}
if (!HOME_STATE_IS_ACTIVE(state))
goto finish;
hd = user_record_home_directory(h->record);
if (!hd)
goto finish;
if (statfs(hd, &sfs) < 0) {
log_debug_errno(errno, "Failed to statfs() %s, ignoring: %m", hd);
goto finish;
}
disk_free = sfs.f_bsize * sfs.f_bavail;
fs_size = sfs.f_bsize * sfs.f_blocks;
if (disk_size != UINT64_MAX && disk_size > fs_size)
header_size = disk_size - fs_size;
/* We take a perspective from the user here (as opposed to from the host): the used disk space is the
* difference from the limit and what's free. This makes a difference if sparse mode is not used: in
* that case the image is pre-allocated and thus appears all used from the host PoV but is not used
* up at all yet from the user's PoV.
*
* That said, we use use the stat() reported loopback file size as upper boundary: our footprint can
* never be larger than what we take up on the lowest layers. */
if (disk_size != UINT64_MAX && disk_size > disk_free) {
disk_usage = disk_size - disk_free;
if (stat_used != UINT64_MAX && disk_usage > stat_used)
disk_usage = stat_used;
} else
disk_usage = stat_used;
/* If we have the magic, determine floor preferably by magic */
disk_floor = minimal_size_by_fs_magic(sfs.f_type) + header_size;
finish:
/* If we don't know the magic, go by file system name */
if (disk_floor == UINT64_MAX)
disk_floor = minimal_size_by_fs_name(user_record_file_system_type(h->record));
*ret_disk_size = disk_size;
*ret_disk_usage = disk_usage;
*ret_disk_free = disk_free;
*ret_disk_ceiling = disk_ceiling;
*ret_disk_floor = disk_floor;
return 0;
}
static int home_get_disk_status_directory(
Home *h,
HomeState state,
uint64_t *ret_disk_size,
uint64_t *ret_disk_usage,
uint64_t *ret_disk_free,
uint64_t *ret_disk_ceiling,
uint64_t *ret_disk_floor) {
uint64_t disk_size = UINT64_MAX, disk_usage = UINT64_MAX, disk_free = UINT64_MAX,
disk_ceiling = UINT64_MAX, disk_floor = UINT64_MAX;
struct statfs sfs;
struct dqblk req;
const char *path = NULL;
int r;
assert(ret_disk_size);
assert(ret_disk_usage);
assert(ret_disk_free);
assert(ret_disk_ceiling);
assert(ret_disk_floor);
if (HOME_STATE_IS_ACTIVE(state))
path = user_record_home_directory(h->record);
if (!path) {
if (state == HOME_ABSENT)
goto finish;
path = user_record_image_path(h->record);
}
if (!path)
goto finish;
if (statfs(path, &sfs) < 0)
log_debug_errno(errno, "Failed to statfs() %s, ignoring: %m", path);
else {
disk_free = sfs.f_bsize * sfs.f_bavail;
disk_size = sfs.f_bsize * sfs.f_blocks;
/* We don't initialize disk_usage from statfs() data here, since the device is likely not used
* by us alone, and disk_usage should only reflect our own use. */
}
if (IN_SET(h->record->storage, USER_CLASSIC, USER_DIRECTORY, USER_SUBVOLUME)) {
r = btrfs_is_subvol(path);
if (r < 0)
log_debug_errno(r, "Failed to determine whether %s is a btrfs subvolume: %m", path);
else if (r > 0) {
BtrfsQuotaInfo qi;
r = btrfs_subvol_get_subtree_quota(path, 0, &qi);
if (r < 0)
log_debug_errno(r, "Failed to query btrfs subtree quota, ignoring: %m");
else {
disk_usage = qi.referenced;
if (disk_free != UINT64_MAX) {
disk_ceiling = qi.referenced + disk_free;
if (disk_size != UINT64_MAX && disk_ceiling > disk_size)
disk_ceiling = disk_size;
}
if (qi.referenced_max != UINT64_MAX) {
if (disk_size != UINT64_MAX)
disk_size = MIN(qi.referenced_max, disk_size);
else
disk_size = qi.referenced_max;
}
if (disk_size != UINT64_MAX) {
if (disk_size > disk_usage)
disk_free = disk_size - disk_usage;
else
disk_free = 0;
}
}
goto finish;
}
}
if (IN_SET(h->record->storage, USER_CLASSIC, USER_DIRECTORY, USER_FSCRYPT)) {
r = quotactl_path(QCMD_FIXED(Q_GETQUOTA, USRQUOTA), path, h->uid, &req);
if (r < 0) {
if (ERRNO_IS_NOT_SUPPORTED(r)) {
log_debug_errno(r, "No UID quota support on %s.", path);
goto finish;
}
if (r != -ESRCH) {
log_debug_errno(r, "Failed to query disk quota for UID " UID_FMT ": %m", h->uid);
goto finish;
}
disk_usage = 0; /* No record of this user? then nothing was used */
} else {
if (FLAGS_SET(req.dqb_valid, QIF_SPACE) && disk_free != UINT64_MAX) {
disk_ceiling = req.dqb_curspace + disk_free;
if (disk_size != UINT64_MAX && disk_ceiling > disk_size)
disk_ceiling = disk_size;
}
if (FLAGS_SET(req.dqb_valid, QIF_BLIMITS)) {
uint64_t q;
/* Take the minimum of the quota and the available disk space here */
q = req.dqb_bhardlimit * QIF_DQBLKSIZE;
if (disk_size != UINT64_MAX)
disk_size = MIN(disk_size, q);
else
disk_size = q;
}
if (FLAGS_SET(req.dqb_valid, QIF_SPACE)) {
disk_usage = req.dqb_curspace;
if (disk_size != UINT64_MAX) {
if (disk_size > disk_usage)
disk_free = disk_size - disk_usage;
else
disk_free = 0;
}
}
}
}
finish:
*ret_disk_size = disk_size;
*ret_disk_usage = disk_usage;
*ret_disk_free = disk_free;
*ret_disk_ceiling = disk_ceiling;
*ret_disk_floor = disk_floor;
return 0;
}
int home_augment_status(
Home *h,
UserRecordLoadFlags flags,
UserRecord **ret) {
uint64_t disk_size = UINT64_MAX, disk_usage = UINT64_MAX, disk_free = UINT64_MAX, disk_ceiling = UINT64_MAX, disk_floor = UINT64_MAX;
_cleanup_(json_variant_unrefp) JsonVariant *j = NULL, *v = NULL, *m = NULL, *status = NULL;
_cleanup_(user_record_unrefp) UserRecord *ur = NULL;
char ids[SD_ID128_STRING_MAX];
HomeState state;
sd_id128_t id;
int r;
assert(h);
assert(ret);
/* We are supposed to add this, this can't be on hence. */
assert(!FLAGS_SET(flags, USER_RECORD_STRIP_STATUS));
r = sd_id128_get_machine(&id);
if (r < 0)
return r;
state = home_get_state(h);
switch (h->record->storage) {
case USER_LUKS:
r = home_get_disk_status_luks(h, state, &disk_size, &disk_usage, &disk_free, &disk_ceiling, &disk_floor);
if (r < 0)
return r;
break;
case USER_CLASSIC:
case USER_DIRECTORY:
case USER_SUBVOLUME:
case USER_FSCRYPT:
case USER_CIFS:
r = home_get_disk_status_directory(h, state, &disk_size, &disk_usage, &disk_free, &disk_ceiling, &disk_floor);
if (r < 0)
return r;
break;
default:
; /* unset */
}
if (disk_floor == UINT64_MAX || (disk_usage != UINT64_MAX && disk_floor < disk_usage))
disk_floor = disk_usage;
if (disk_floor == UINT64_MAX || disk_floor < USER_DISK_SIZE_MIN)
disk_floor = USER_DISK_SIZE_MIN;
if (disk_ceiling == UINT64_MAX || disk_ceiling > USER_DISK_SIZE_MAX)
disk_ceiling = USER_DISK_SIZE_MAX;
r = json_build(&status,
JSON_BUILD_OBJECT(
JSON_BUILD_PAIR("state", JSON_BUILD_STRING(home_state_to_string(state))),
JSON_BUILD_PAIR("service", JSON_BUILD_STRING("io.systemd.Home")),
JSON_BUILD_PAIR_CONDITION(disk_size != UINT64_MAX, "diskSize", JSON_BUILD_UNSIGNED(disk_size)),
JSON_BUILD_PAIR_CONDITION(disk_usage != UINT64_MAX, "diskUsage", JSON_BUILD_UNSIGNED(disk_usage)),
JSON_BUILD_PAIR_CONDITION(disk_free != UINT64_MAX, "diskFree", JSON_BUILD_UNSIGNED(disk_free)),
JSON_BUILD_PAIR_CONDITION(disk_ceiling != UINT64_MAX, "diskCeiling", JSON_BUILD_UNSIGNED(disk_ceiling)),
JSON_BUILD_PAIR_CONDITION(disk_floor != UINT64_MAX, "diskFloor", JSON_BUILD_UNSIGNED(disk_floor)),
JSON_BUILD_PAIR_CONDITION(h->signed_locally >= 0, "signedLocally", JSON_BUILD_BOOLEAN(h->signed_locally))
));
if (r < 0)
return r;
j = json_variant_ref(h->record->json);
v = json_variant_ref(json_variant_by_key(j, "status"));
m = json_variant_ref(json_variant_by_key(v, sd_id128_to_string(id, ids)));
r = json_variant_filter(&m, STRV_MAKE("diskSize", "diskUsage", "diskFree", "diskCeiling", "diskFloor", "signedLocally"));
if (r < 0)
return r;
r = json_variant_merge(&m, status);
if (r < 0)
return r;
r = json_variant_set_field(&v, ids, m);
if (r < 0)
return r;
r = json_variant_set_field(&j, "status", v);
if (r < 0)
return r;
ur = user_record_new();
if (!ur)
return -ENOMEM;
r = user_record_load(ur, j, flags);
if (r < 0)
return r;
ur->incomplete =
FLAGS_SET(h->record->mask, USER_RECORD_PRIVILEGED) &&
!FLAGS_SET(ur->mask, USER_RECORD_PRIVILEGED);
*ret = TAKE_PTR(ur);
return 0;
}
static int on_home_ref_eof(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
_cleanup_(operation_unrefp) Operation *o = NULL;
Home *h = userdata;
assert(s);
assert(h);
if (h->ref_event_source_please_suspend == s)
h->ref_event_source_please_suspend = sd_event_source_disable_unref(h->ref_event_source_please_suspend);
if (h->ref_event_source_dont_suspend == s)
h->ref_event_source_dont_suspend = sd_event_source_disable_unref(h->ref_event_source_dont_suspend);
if (h->ref_event_source_dont_suspend || h->ref_event_source_please_suspend)
return 0;
log_info("Got notification that all sessions of user %s ended, deactivating automatically.", h->user_name);
o = operation_new(OPERATION_PIPE_EOF, NULL);
if (!o) {
log_oom();
return 0;
}
home_schedule_operation(h, o, NULL);
return 0;
}
int home_create_fifo(Home *h, bool please_suspend) {
_cleanup_close_ int ret_fd = -1;
sd_event_source **ss;
const char *fn, *suffix;
int r;
assert(h);
if (please_suspend) {
suffix = ".please-suspend";
ss = &h->ref_event_source_please_suspend;
} else {
suffix = ".dont-suspend";
ss = &h->ref_event_source_dont_suspend;
}
fn = strjoina("/run/systemd/home/", h->user_name, suffix);
if (!*ss) {
_cleanup_close_ int ref_fd = -1;
(void) mkdir("/run/systemd/home/", 0755);
if (mkfifo(fn, 0600) < 0 && errno != EEXIST)
return log_error_errno(errno, "Failed to create FIFO %s: %m", fn);
ref_fd = open(fn, O_RDONLY|O_CLOEXEC|O_NONBLOCK);
if (ref_fd < 0)
return log_error_errno(errno, "Failed to open FIFO %s for reading: %m", fn);
r = sd_event_add_io(h->manager->event, ss, ref_fd, 0, on_home_ref_eof, h);
if (r < 0)
return log_error_errno(r, "Failed to allocate reference FIFO event source: %m");
(void) sd_event_source_set_description(*ss, "acquire-ref");
r = sd_event_source_set_priority(*ss, SD_EVENT_PRIORITY_IDLE-1);
if (r < 0)
return r;
r = sd_event_source_set_io_fd_own(*ss, true);
if (r < 0)
return log_error_errno(r, "Failed to pass ownership of FIFO event fd to event source: %m");
TAKE_FD(ref_fd);
}
ret_fd = open(fn, O_WRONLY|O_CLOEXEC|O_NONBLOCK);
if (ret_fd < 0)
return log_error_errno(errno, "Failed to open FIFO %s for writing: %m", fn);
return TAKE_FD(ret_fd);
}
static int home_dispatch_acquire(Home *h, Operation *o) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int (*call)(Home *h, UserRecord *secret, HomeState for_state, sd_bus_error *error) = NULL;
HomeState for_state;
int r;
assert(h);
assert(o);
assert(o->type == OPERATION_ACQUIRE);
switch (home_get_state(h)) {
case HOME_UNFIXATED:
for_state = HOME_FIXATING_FOR_ACQUIRE;
call = home_fixate_internal;
break;
case HOME_ABSENT:
r = sd_bus_error_setf(&error, BUS_ERROR_HOME_ABSENT, "Home %s is currently missing or not plugged in.", h->user_name);
break;
case HOME_INACTIVE:
for_state = HOME_ACTIVATING_FOR_ACQUIRE;
call = home_activate_internal;
break;
case HOME_ACTIVE:
for_state = HOME_AUTHENTICATING_FOR_ACQUIRE;
call = home_authenticate_internal;
break;
case HOME_LOCKED:
for_state = HOME_UNLOCKING_FOR_ACQUIRE;
call = home_unlock_internal;
break;
default:
/* All other cases means we are currently executing an operation, which means the job remains
* pending. */
return 0;
}
assert(!h->current_operation);
if (call) {
r = home_ratelimit(h, &error);
if (r >= 0)
r = call(h, o->secret, for_state, &error);
}
if (r != 0) /* failure or completed */
operation_result(o, r, &error);
else /* ongoing */
h->current_operation = operation_ref(o);
return 1;
}
static int home_dispatch_release(Home *h, Operation *o) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
assert(h);
assert(o);
assert(o->type == OPERATION_RELEASE);
if (h->ref_event_source_dont_suspend || h->ref_event_source_please_suspend)
/* If there's now a reference again, then let's abort the release attempt */
r = sd_bus_error_setf(&error, BUS_ERROR_HOME_BUSY, "Home %s is currently referenced.", h->user_name);
else {
switch (home_get_state(h)) {
case HOME_UNFIXATED:
case HOME_ABSENT:
case HOME_INACTIVE:
r = 0; /* done */
break;
case HOME_LOCKED:
r = sd_bus_error_setf(&error, BUS_ERROR_HOME_LOCKED, "Home %s is currently locked.", h->user_name);
break;
case HOME_ACTIVE:
r = home_deactivate_internal(h, false, &error);
break;
default:
/* All other cases means we are currently executing an operation, which means the job remains
* pending. */
return 0;
}
}
assert(!h->current_operation);
if (r <= 0) /* failure or completed */
operation_result(o, r, &error);
else /* ongoing */
h->current_operation = operation_ref(o);
return 1;
}
static int home_dispatch_lock_all(Home *h, Operation *o) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
assert(h);
assert(o);
assert(o->type == OPERATION_LOCK_ALL);
switch (home_get_state(h)) {
case HOME_UNFIXATED:
case HOME_ABSENT:
case HOME_INACTIVE:
log_info("Home %s is not active, no locking necessary.", h->user_name);
r = 0; /* done */
break;
case HOME_LOCKED:
log_info("Home %s is already locked.", h->user_name);
r = 0; /* done */
break;
case HOME_ACTIVE:
log_info("Locking home %s.", h->user_name);
r = home_lock(h, &error);
break;
default:
/* All other cases means we are currently executing an operation, which means the job remains
* pending. */
return 0;
}
assert(!h->current_operation);
if (r != 0) /* failure or completed */
operation_result(o, r, &error);
else /* ongoing */
h->current_operation = operation_ref(o);
return 1;
}
static int home_dispatch_pipe_eof(Home *h, Operation *o) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
assert(h);
assert(o);
assert(o->type == OPERATION_PIPE_EOF);
if (h->ref_event_source_please_suspend || h->ref_event_source_dont_suspend)
return 1; /* Hmm, there's a reference again, let's cancel this */
switch (home_get_state(h)) {
case HOME_UNFIXATED:
case HOME_ABSENT:
case HOME_INACTIVE:
log_info("Home %s already deactivated, no automatic deactivation needed.", h->user_name);
break;
case HOME_DEACTIVATING:
log_info("Home %s is already being deactivated, automatic deactivated unnecessary.", h->user_name);
break;
case HOME_ACTIVE:
r = home_deactivate_internal(h, false, &error);
if (r < 0)
log_warning_errno(r, "Failed to deactivate %s, ignoring: %s", h->user_name, bus_error_message(&error, r));
break;
case HOME_LOCKED:
default:
/* If the device is locked or any operation is being executed, let's leave this pending */
return 0;
}
/* Note that we don't call operation_fail() or operation_success() here, because this kind of
* operation has no message associated with it, and thus there's no need to propagate success. */
assert(!o->message);
return 1;
}
static int home_dispatch_deactivate_force(Home *h, Operation *o) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
assert(h);
assert(o);
assert(o->type == OPERATION_DEACTIVATE_FORCE);
switch (home_get_state(h)) {
case HOME_UNFIXATED:
case HOME_ABSENT:
case HOME_INACTIVE:
log_debug("Home %s already deactivated, no forced deactivation due to unplug needed.", h->user_name);
break;
case HOME_DEACTIVATING:
log_debug("Home %s is already being deactivated, forced deactivation due to unplug unnecessary.", h->user_name);
break;
case HOME_ACTIVE:
case HOME_LOCKED:
r = home_deactivate_internal(h, true, &error);
if (r < 0)
log_warning_errno(r, "Failed to forcibly deactivate %s, ignoring: %s", h->user_name, bus_error_message(&error, r));
break;
default:
/* If any operation is being executed, let's leave this pending */
return 0;
}
/* Note that we don't call operation_fail() or operation_success() here, because this kind of
* operation has no message associated with it, and thus there's no need to propagate success. */
assert(!o->message);
return 1;
}
static int on_pending(sd_event_source *s, void *userdata) {
Home *h = userdata;
Operation *o;
int r;
assert(s);
assert(h);
o = ordered_set_first(h->pending_operations);
if (o) {
static int (* const operation_table[_OPERATION_MAX])(Home *h, Operation *o) = {
[OPERATION_ACQUIRE] = home_dispatch_acquire,
[OPERATION_RELEASE] = home_dispatch_release,
[OPERATION_LOCK_ALL] = home_dispatch_lock_all,
[OPERATION_PIPE_EOF] = home_dispatch_pipe_eof,
[OPERATION_DEACTIVATE_FORCE] = home_dispatch_deactivate_force,
};
assert(operation_table[o->type]);
r = operation_table[o->type](h, o);
if (r != 0) {
/* The operation completed, let's remove it from the pending list, and exit while
* leaving the event source enabled as it is. */
assert_se(ordered_set_remove(h->pending_operations, o) == o);
operation_unref(o);
return 0;
}
}
/* Nothing to do anymore, let's turn off this event source */
r = sd_event_source_set_enabled(s, SD_EVENT_OFF);
if (r < 0)
return log_error_errno(r, "Failed to disable event source: %m");
return 0;
}
int home_schedule_operation(Home *h, Operation *o, sd_bus_error *error) {
int r;
assert(h);
if (o) {
if (ordered_set_size(h->pending_operations) >= PENDING_OPERATIONS_MAX)
return sd_bus_error_setf(error, BUS_ERROR_TOO_MANY_OPERATIONS, "Too many client operations requested");
r = ordered_set_ensure_allocated(&h->pending_operations, &operation_hash_ops);
if (r < 0)
return r;
r = ordered_set_put(h->pending_operations, o);
if (r < 0)
return r;
operation_ref(o);
}
if (!h->pending_event_source) {
r = sd_event_add_defer(h->manager->event, &h->pending_event_source, on_pending, h);
if (r < 0)
return log_error_errno(r, "Failed to allocate pending defer event source: %m");
(void) sd_event_source_set_description(h->pending_event_source, "pending");
r = sd_event_source_set_priority(h->pending_event_source, SD_EVENT_PRIORITY_IDLE);
if (r < 0)
return r;
}
r = sd_event_source_set_enabled(h->pending_event_source, SD_EVENT_ON);
if (r < 0)
return log_error_errno(r, "Failed to trigger pending event source: %m");
return 0;
}
static int home_get_image_path_seat(Home *h, char **ret) {
_cleanup_(sd_device_unrefp) sd_device *d = NULL;
_cleanup_free_ char *c = NULL;
const char *ip, *seat;
struct stat st;
int r;
assert(h);
if (user_record_storage(h->record) != USER_LUKS)
return -ENXIO;
ip = user_record_image_path(h->record);
if (!ip)
return -ENXIO;
if (!path_startswith(ip, "/dev/"))
return -ENXIO;
if (stat(ip, &st) < 0)
return -errno;
if (!S_ISBLK(st.st_mode))
return -ENOTBLK;
r = sd_device_new_from_devnum(&d, 'b', st.st_rdev);
if (r < 0)
return r;
r = sd_device_get_property_value(d, "ID_SEAT", &seat);
if (r == -ENOENT) /* no property means seat0 */
seat = "seat0";
else if (r < 0)
return r;
c = strdup(seat);
if (!c)
return -ENOMEM;
*ret = TAKE_PTR(c);
return 0;
}
int home_auto_login(Home *h, char ***ret_seats) {
_cleanup_free_ char *seat = NULL, *seat2 = NULL;
assert(h);
assert(ret_seats);
(void) home_get_image_path_seat(h, &seat);
if (h->record->auto_login > 0 && !streq_ptr(seat, "seat0")) {
/* For now, when the auto-login boolean is set for a user, let's make it mean
* "seat0". Eventually we can extend the concept and allow configuration of any kind of seat,
* but let's keep simple initially, most likely the feature is interesting on single-user
* systems anyway, only.
*
* We filter out users marked for auto-login in we know for sure their home directory is
* absent. */
if (user_record_test_image_path(h->record) != USER_TEST_ABSENT) {
seat2 = strdup("seat0");
if (!seat2)
return -ENOMEM;
}
}
if (seat || seat2) {
_cleanup_strv_free_ char **list = NULL;
size_t i = 0;
list = new(char*, 3);
if (!list)
return -ENOMEM;
if (seat)
list[i++] = TAKE_PTR(seat);
if (seat2)
list[i++] = TAKE_PTR(seat2);
list[i] = NULL;
*ret_seats = TAKE_PTR(list);
return 1;
}
*ret_seats = NULL;
return 0;
}
int home_set_current_message(Home *h, sd_bus_message *m) {
assert(h);
if (!m)
return 0;
if (h->current_operation)
return -EBUSY;
h->current_operation = operation_new(OPERATION_IMMEDIATE, m);
if (!h->current_operation)
return -ENOMEM;
return 1;
}
int home_wait_for_worker(Home *h) {
assert(h);
if (h->worker_pid <= 0)
return 0;
log_info("Worker process for home %s is still running while exiting. Waiting for it to finish.", h->user_name);
(void) wait_for_terminate(h->worker_pid, NULL);
(void) hashmap_remove_value(h->manager->homes_by_worker_pid, PID_TO_PTR(h->worker_pid), h);
h->worker_pid = 0;
return 1;
}
static const char* const home_state_table[_HOME_STATE_MAX] = {
[HOME_UNFIXATED] = "unfixated",
[HOME_ABSENT] = "absent",
[HOME_INACTIVE] = "inactive",
[HOME_FIXATING] = "fixating",
[HOME_FIXATING_FOR_ACTIVATION] = "fixating-for-activation",
[HOME_FIXATING_FOR_ACQUIRE] = "fixating-for-acquire",
[HOME_ACTIVATING] = "activating",
[HOME_ACTIVATING_FOR_ACQUIRE] = "activating-for-acquire",
[HOME_DEACTIVATING] = "deactivating",
[HOME_ACTIVE] = "active",
[HOME_LOCKING] = "locking",
[HOME_LOCKED] = "locked",
[HOME_UNLOCKING] = "unlocking",
[HOME_UNLOCKING_FOR_ACQUIRE] = "unlocking-for-acquire",
[HOME_CREATING] = "creating",
[HOME_REMOVING] = "removing",
[HOME_UPDATING] = "updating",
[HOME_UPDATING_WHILE_ACTIVE] = "updating-while-active",
[HOME_RESIZING] = "resizing",
[HOME_RESIZING_WHILE_ACTIVE] = "resizing-while-active",
[HOME_PASSWD] = "passwd",
[HOME_PASSWD_WHILE_ACTIVE] = "passwd-while-active",
[HOME_AUTHENTICATING] = "authenticating",
[HOME_AUTHENTICATING_WHILE_ACTIVE] = "authenticating-while-active",
[HOME_AUTHENTICATING_FOR_ACQUIRE] = "authenticating-for-acquire",
};
DEFINE_STRING_TABLE_LOOKUP(home_state, HomeState);