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logind-session.c
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logind-session.c
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <fcntl.h>
#include <linux/kd.h>
#include <linux/vt.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <unistd.h>
#include "sd-messages.h"
#include "alloc-util.h"
#include "audit-util.h"
#include "bus-error.h"
#include "bus-util.h"
#include "env-file.h"
#include "escape.h"
#include "fd-util.h"
#include "fileio.h"
#include "format-util.h"
#include "io-util.h"
#include "logind-dbus.h"
#include "logind-seat-dbus.h"
#include "logind-session-dbus.h"
#include "logind-session.h"
#include "logind-user-dbus.h"
#include "mkdir-label.h"
#include "parse-util.h"
#include "path-util.h"
#include "process-util.h"
#include "serialize.h"
#include "string-table.h"
#include "strv.h"
#include "terminal-util.h"
#include "tmpfile-util.h"
#include "user-util.h"
#include "util.h"
#define RELEASE_USEC (20*USEC_PER_SEC)
static void session_remove_fifo(Session *s);
static void session_restore_vt(Session *s);
int session_new(Session **ret, Manager *m, const char *id) {
_cleanup_(session_freep) Session *s = NULL;
int r;
assert(ret);
assert(m);
assert(id);
if (!session_id_valid(id))
return -EINVAL;
s = new(Session, 1);
if (!s)
return -ENOMEM;
*s = (Session) {
.manager = m,
.fifo_fd = -1,
.vtfd = -1,
.audit_id = AUDIT_SESSION_INVALID,
.tty_validity = _TTY_VALIDITY_INVALID,
};
s->state_file = path_join("/run/systemd/sessions", id);
if (!s->state_file)
return -ENOMEM;
s->id = basename(s->state_file);
s->devices = hashmap_new(&devt_hash_ops);
if (!s->devices)
return -ENOMEM;
r = hashmap_put(m->sessions, s->id, s);
if (r < 0)
return r;
*ret = TAKE_PTR(s);
return 0;
}
Session* session_free(Session *s) {
SessionDevice *sd;
if (!s)
return NULL;
if (s->in_gc_queue)
LIST_REMOVE(gc_queue, s->manager->session_gc_queue, s);
s->timer_event_source = sd_event_source_unref(s->timer_event_source);
session_drop_controller(s);
while ((sd = hashmap_first(s->devices)))
session_device_free(sd);
hashmap_free(s->devices);
if (s->user) {
LIST_REMOVE(sessions_by_user, s->user->sessions, s);
if (s->user->display == s)
s->user->display = NULL;
user_update_last_session_timer(s->user);
}
if (s->seat) {
if (s->seat->active == s)
s->seat->active = NULL;
if (s->seat->pending_switch == s)
s->seat->pending_switch = NULL;
seat_evict_position(s->seat, s);
LIST_REMOVE(sessions_by_seat, s->seat->sessions, s);
}
if (s->scope) {
hashmap_remove(s->manager->session_units, s->scope);
free(s->scope);
}
if (pid_is_valid(s->leader))
(void) hashmap_remove_value(s->manager->sessions_by_leader, PID_TO_PTR(s->leader), s);
free(s->scope_job);
sd_bus_message_unref(s->create_message);
free(s->tty);
free(s->display);
free(s->remote_host);
free(s->remote_user);
free(s->service);
free(s->desktop);
hashmap_remove(s->manager->sessions, s->id);
sd_event_source_unref(s->fifo_event_source);
safe_close(s->fifo_fd);
/* Note that we remove neither the state file nor the fifo path here, since we want both to survive
* daemon restarts */
free(s->state_file);
free(s->fifo_path);
return mfree(s);
}
void session_set_user(Session *s, User *u) {
assert(s);
assert(!s->user);
s->user = u;
LIST_PREPEND(sessions_by_user, u->sessions, s);
user_update_last_session_timer(u);
}
int session_set_leader(Session *s, pid_t pid) {
int r;
assert(s);
if (!pid_is_valid(pid))
return -EINVAL;
if (s->leader == pid)
return 0;
r = hashmap_put(s->manager->sessions_by_leader, PID_TO_PTR(pid), s);
if (r < 0)
return r;
if (pid_is_valid(s->leader))
(void) hashmap_remove_value(s->manager->sessions_by_leader, PID_TO_PTR(s->leader), s);
s->leader = pid;
(void) audit_session_from_pid(pid, &s->audit_id);
return 1;
}
static void session_save_devices(Session *s, FILE *f) {
SessionDevice *sd;
if (!hashmap_isempty(s->devices)) {
fprintf(f, "DEVICES=");
HASHMAP_FOREACH(sd, s->devices)
fprintf(f, "%u:%u ", major(sd->dev), minor(sd->dev));
fprintf(f, "\n");
}
}
int session_save(Session *s) {
_cleanup_free_ char *temp_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
int r;
assert(s);
if (!s->user)
return -ESTALE;
if (!s->started)
return 0;
r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE);
if (r < 0)
goto fail;
r = fopen_temporary(s->state_file, &f, &temp_path);
if (r < 0)
goto fail;
(void) fchmod(fileno(f), 0644);
fprintf(f,
"# This is private data. Do not parse.\n"
"UID="UID_FMT"\n"
"USER=%s\n"
"ACTIVE=%i\n"
"IS_DISPLAY=%i\n"
"STATE=%s\n"
"REMOTE=%i\n",
s->user->user_record->uid,
s->user->user_record->user_name,
session_is_active(s),
s->user->display == s,
session_state_to_string(session_get_state(s)),
s->remote);
if (s->type >= 0)
fprintf(f, "TYPE=%s\n", session_type_to_string(s->type));
if (s->original_type >= 0)
fprintf(f, "ORIGINAL_TYPE=%s\n", session_type_to_string(s->original_type));
if (s->class >= 0)
fprintf(f, "CLASS=%s\n", session_class_to_string(s->class));
if (s->scope)
fprintf(f, "SCOPE=%s\n", s->scope);
if (s->scope_job)
fprintf(f, "SCOPE_JOB=%s\n", s->scope_job);
if (s->fifo_path)
fprintf(f, "FIFO=%s\n", s->fifo_path);
if (s->seat)
fprintf(f, "SEAT=%s\n", s->seat->id);
if (s->tty)
fprintf(f, "TTY=%s\n", s->tty);
if (s->tty_validity >= 0)
fprintf(f, "TTY_VALIDITY=%s\n", tty_validity_to_string(s->tty_validity));
if (s->display)
fprintf(f, "DISPLAY=%s\n", s->display);
if (s->remote_host) {
_cleanup_free_ char *escaped = NULL;
escaped = cescape(s->remote_host);
if (!escaped) {
r = -ENOMEM;
goto fail;
}
fprintf(f, "REMOTE_HOST=%s\n", escaped);
}
if (s->remote_user) {
_cleanup_free_ char *escaped = NULL;
escaped = cescape(s->remote_user);
if (!escaped) {
r = -ENOMEM;
goto fail;
}
fprintf(f, "REMOTE_USER=%s\n", escaped);
}
if (s->service) {
_cleanup_free_ char *escaped = NULL;
escaped = cescape(s->service);
if (!escaped) {
r = -ENOMEM;
goto fail;
}
fprintf(f, "SERVICE=%s\n", escaped);
}
if (s->desktop) {
_cleanup_free_ char *escaped = NULL;
escaped = cescape(s->desktop);
if (!escaped) {
r = -ENOMEM;
goto fail;
}
fprintf(f, "DESKTOP=%s\n", escaped);
}
if (s->seat && seat_has_vts(s->seat))
fprintf(f, "VTNR=%u\n", s->vtnr);
if (!s->vtnr)
fprintf(f, "POSITION=%u\n", s->position);
if (pid_is_valid(s->leader))
fprintf(f, "LEADER="PID_FMT"\n", s->leader);
if (audit_session_is_valid(s->audit_id))
fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id);
if (dual_timestamp_is_set(&s->timestamp))
fprintf(f,
"REALTIME="USEC_FMT"\n"
"MONOTONIC="USEC_FMT"\n",
s->timestamp.realtime,
s->timestamp.monotonic);
if (s->controller) {
fprintf(f, "CONTROLLER=%s\n", s->controller);
session_save_devices(s, f);
}
r = fflush_and_check(f);
if (r < 0)
goto fail;
if (rename(temp_path, s->state_file) < 0) {
r = -errno;
goto fail;
}
return 0;
fail:
(void) unlink(s->state_file);
if (temp_path)
(void) unlink(temp_path);
return log_error_errno(r, "Failed to save session data %s: %m", s->state_file);
}
static int session_load_devices(Session *s, const char *devices) {
const char *p;
int r = 0;
assert(s);
for (p = devices;;) {
_cleanup_free_ char *word = NULL;
SessionDevice *sd;
dev_t dev;
int k;
k = extract_first_word(&p, &word, NULL, 0);
if (k == 0)
break;
if (k < 0) {
r = k;
break;
}
k = parse_dev(word, &dev);
if (k < 0) {
r = k;
continue;
}
/* The file descriptors for loaded devices will be reattached later. */
k = session_device_new(s, dev, false, &sd);
if (k < 0)
r = k;
}
if (r < 0)
log_error_errno(r, "Loading session devices for session %s failed: %m", s->id);
return r;
}
int session_load(Session *s) {
_cleanup_free_ char *remote = NULL,
*seat = NULL,
*tty_validity = NULL,
*vtnr = NULL,
*state = NULL,
*position = NULL,
*leader = NULL,
*type = NULL,
*original_type = NULL,
*class = NULL,
*uid = NULL,
*realtime = NULL,
*monotonic = NULL,
*controller = NULL,
*active = NULL,
*devices = NULL,
*is_display = NULL;
int k, r;
assert(s);
r = parse_env_file(NULL, s->state_file,
"REMOTE", &remote,
"SCOPE", &s->scope,
"SCOPE_JOB", &s->scope_job,
"FIFO", &s->fifo_path,
"SEAT", &seat,
"TTY", &s->tty,
"TTY_VALIDITY", &tty_validity,
"DISPLAY", &s->display,
"REMOTE_HOST", &s->remote_host,
"REMOTE_USER", &s->remote_user,
"SERVICE", &s->service,
"DESKTOP", &s->desktop,
"VTNR", &vtnr,
"STATE", &state,
"POSITION", &position,
"LEADER", &leader,
"TYPE", &type,
"ORIGINAL_TYPE", &original_type,
"CLASS", &class,
"UID", &uid,
"REALTIME", &realtime,
"MONOTONIC", &monotonic,
"CONTROLLER", &controller,
"ACTIVE", &active,
"DEVICES", &devices,
"IS_DISPLAY", &is_display);
if (r < 0)
return log_error_errno(r, "Failed to read %s: %m", s->state_file);
if (!s->user) {
uid_t u;
User *user;
if (!uid)
return log_error_errno(SYNTHETIC_ERRNO(ENOENT),
"UID not specified for session %s",
s->id);
r = parse_uid(uid, &u);
if (r < 0) {
log_error("Failed to parse UID value %s for session %s.", uid, s->id);
return r;
}
user = hashmap_get(s->manager->users, UID_TO_PTR(u));
if (!user)
return log_error_errno(SYNTHETIC_ERRNO(ENOENT),
"User of session %s not known.",
s->id);
session_set_user(s, user);
}
if (remote) {
k = parse_boolean(remote);
if (k >= 0)
s->remote = k;
}
if (vtnr)
safe_atou(vtnr, &s->vtnr);
if (seat && !s->seat) {
Seat *o;
o = hashmap_get(s->manager->seats, seat);
if (o)
r = seat_attach_session(o, s);
if (!o || r < 0)
log_error("Cannot attach session %s to seat %s", s->id, seat);
}
if (!s->seat || !seat_has_vts(s->seat))
s->vtnr = 0;
if (position && s->seat) {
unsigned npos;
safe_atou(position, &npos);
seat_claim_position(s->seat, s, npos);
}
if (tty_validity) {
TTYValidity v;
v = tty_validity_from_string(tty_validity);
if (v < 0)
log_debug("Failed to parse TTY validity: %s", tty_validity);
else
s->tty_validity = v;
}
if (leader) {
pid_t pid;
r = parse_pid(leader, &pid);
if (r < 0)
log_debug_errno(r, "Failed to parse leader PID of session: %s", leader);
else {
r = session_set_leader(s, pid);
if (r < 0)
log_warning_errno(r, "Failed to set session leader PID, ignoring: %m");
}
}
if (type) {
SessionType t;
t = session_type_from_string(type);
if (t >= 0)
s->type = t;
}
if (original_type) {
SessionType ot;
ot = session_type_from_string(original_type);
if (ot >= 0)
s->original_type = ot;
} else
/* Pre-v246 compat: initialize original_type if not set in the state file */
s->original_type = s->type;
if (class) {
SessionClass c;
c = session_class_from_string(class);
if (c >= 0)
s->class = c;
}
if (state && streq(state, "closing"))
s->stopping = true;
if (s->fifo_path) {
int fd;
/* If we open an unopened pipe for reading we will not
get an EOF. to trigger an EOF we hence open it for
writing, but close it right away which then will
trigger the EOF. This will happen immediately if no
other process has the FIFO open for writing, i. e.
when the session died before logind (re)started. */
fd = session_create_fifo(s);
safe_close(fd);
}
if (realtime)
(void) deserialize_usec(realtime, &s->timestamp.realtime);
if (monotonic)
(void) deserialize_usec(monotonic, &s->timestamp.monotonic);
if (active) {
k = parse_boolean(active);
if (k >= 0)
s->was_active = k;
}
if (is_display) {
/* Note that when enumerating users are loaded before sessions, hence the display session to use is
* something we have to store along with the session and not the user, as in that case we couldn't
* apply it at the time we load the user. */
k = parse_boolean(is_display);
if (k < 0)
log_warning_errno(k, "Failed to parse IS_DISPLAY session property: %m");
else if (k > 0)
s->user->display = s;
}
if (controller) {
if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) {
session_set_controller(s, controller, false, false);
session_load_devices(s, devices);
} else
session_restore_vt(s);
}
return r;
}
int session_activate(Session *s) {
unsigned num_pending;
assert(s);
assert(s->user);
if (!s->seat)
return -EOPNOTSUPP;
if (s->seat->active == s)
return 0;
/* on seats with VTs, we let VTs manage session-switching */
if (seat_has_vts(s->seat)) {
if (s->vtnr == 0)
return -EOPNOTSUPP;
return chvt(s->vtnr);
}
/* On seats without VTs, we implement session-switching in logind. We
* try to pause all session-devices and wait until the session
* controller acknowledged them. Once all devices are asleep, we simply
* switch the active session and be done.
* We save the session we want to switch to in seat->pending_switch and
* seat_complete_switch() will perform the final switch. */
s->seat->pending_switch = s;
/* if no devices are running, immediately perform the session switch */
num_pending = session_device_try_pause_all(s);
if (!num_pending)
seat_complete_switch(s->seat);
return 0;
}
static int session_start_scope(Session *s, sd_bus_message *properties, sd_bus_error *error) {
int r;
assert(s);
assert(s->user);
if (!s->scope) {
_cleanup_free_ char *scope = NULL;
const char *description;
s->scope_job = mfree(s->scope_job);
scope = strjoin("session-", s->id, ".scope");
if (!scope)
return log_oom();
description = strjoina("Session ", s->id, " of User ", s->user->user_record->user_name);
r = manager_start_scope(
s->manager,
scope,
s->leader,
s->user->slice,
description,
/* These two have StopWhenUnneeded= set, hence add a dep towards them */
STRV_MAKE(s->user->runtime_dir_service,
s->user->service),
/* And order us after some more */
STRV_MAKE("systemd-logind.service",
"systemd-user-sessions.service",
s->user->runtime_dir_service,
s->user->service),
user_record_home_directory(s->user->user_record),
properties,
error,
&s->scope_job);
if (r < 0)
return log_error_errno(r, "Failed to start session scope %s: %s",
scope, bus_error_message(error, r));
s->scope = TAKE_PTR(scope);
}
(void) hashmap_put(s->manager->session_units, s->scope, s);
return 0;
}
int session_start(Session *s, sd_bus_message *properties, sd_bus_error *error) {
int r;
assert(s);
if (!s->user)
return -ESTALE;
if (s->stopping)
return -EINVAL;
if (s->started)
return 0;
r = user_start(s->user);
if (r < 0)
return r;
r = session_start_scope(s, properties, error);
if (r < 0)
return r;
log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
"MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR,
"SESSION_ID=%s", s->id,
"USER_ID=%s", s->user->user_record->user_name,
"LEADER="PID_FMT, s->leader,
LOG_MESSAGE("New session %s of user %s.", s->id, s->user->user_record->user_name));
if (!dual_timestamp_is_set(&s->timestamp))
dual_timestamp_get(&s->timestamp);
if (s->seat)
seat_read_active_vt(s->seat);
s->started = true;
user_elect_display(s->user);
/* Save data */
session_save(s);
user_save(s->user);
if (s->seat)
seat_save(s->seat);
/* Send signals */
session_send_signal(s, true);
user_send_changed(s->user, "Display", NULL);
if (s->seat && s->seat->active == s)
seat_send_changed(s->seat, "ActiveSession", NULL);
return 0;
}
static int session_stop_scope(Session *s, bool force) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
assert(s);
if (!s->scope)
return 0;
/* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything
* that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log
* when killing any processes left after this point. */
r = manager_abandon_scope(s->manager, s->scope, &error);
if (r < 0) {
log_warning_errno(r, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error, r));
sd_bus_error_free(&error);
}
s->scope_job = mfree(s->scope_job);
/* Optionally, let's kill everything that's left now. */
if (force ||
(s->user->user_record->kill_processes != 0 &&
(s->user->user_record->kill_processes > 0 ||
manager_shall_kill(s->manager, s->user->user_record->user_name)))) {
r = manager_stop_unit(s->manager, s->scope, force ? "replace" : "fail", &error, &s->scope_job);
if (r < 0) {
if (force)
return log_error_errno(r, "Failed to stop session scope: %s", bus_error_message(&error, r));
log_warning_errno(r, "Failed to stop session scope, ignoring: %s", bus_error_message(&error, r));
}
} else {
/* With no killing, this session is allowed to persist in "closing" state indefinitely.
* Therefore session stop and session removal may be two distinct events.
* Session stop is quite significant on its own, let's log it. */
log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
"SESSION_ID=%s", s->id,
"USER_ID=%s", s->user->user_record->user_name,
"LEADER="PID_FMT, s->leader,
LOG_MESSAGE("Session %s logged out. Waiting for processes to exit.", s->id));
}
return 0;
}
int session_stop(Session *s, bool force) {
int r;
assert(s);
/* This is called whenever we begin with tearing down a session record. It's called in four cases: explicit API
* request via the bus (either directly for the session object or for the seat or user object this session
* belongs to; 'force' is true), or due to automatic GC (i.e. scope vanished; 'force' is false), or because the
* session FIFO saw an EOF ('force' is false), or because the release timer hit ('force' is false). */
if (!s->user)
return -ESTALE;
if (!s->started)
return 0;
if (s->stopping)
return 0;
s->timer_event_source = sd_event_source_unref(s->timer_event_source);
if (s->seat)
seat_evict_position(s->seat, s);
/* We are going down, don't care about FIFOs anymore */
session_remove_fifo(s);
/* Kill cgroup */
r = session_stop_scope(s, force);
s->stopping = true;
user_elect_display(s->user);
session_save(s);
user_save(s->user);
return r;
}
int session_finalize(Session *s) {
SessionDevice *sd;
assert(s);
if (!s->user)
return -ESTALE;
if (s->started)
log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
"MESSAGE_ID=" SD_MESSAGE_SESSION_STOP_STR,
"SESSION_ID=%s", s->id,
"USER_ID=%s", s->user->user_record->user_name,
"LEADER="PID_FMT, s->leader,
LOG_MESSAGE("Removed session %s.", s->id));
s->timer_event_source = sd_event_source_unref(s->timer_event_source);
if (s->seat)
seat_evict_position(s->seat, s);
/* Kill session devices */
while ((sd = hashmap_first(s->devices)))
session_device_free(sd);
(void) unlink(s->state_file);
session_add_to_gc_queue(s);
user_add_to_gc_queue(s->user);
if (s->started) {
session_send_signal(s, false);
s->started = false;
}
if (s->seat) {
if (s->seat->active == s)
seat_set_active(s->seat, NULL);
seat_save(s->seat);
}
user_save(s->user);
user_send_changed(s->user, "Display", NULL);
return 0;
}
static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) {
Session *s = userdata;
assert(es);
assert(s);
session_stop(s, /* force = */ false);
return 0;
}
int session_release(Session *s) {
assert(s);
if (!s->started || s->stopping)
return 0;
if (s->timer_event_source)
return 0;
return sd_event_add_time_relative(
s->manager->event,
&s->timer_event_source,
CLOCK_MONOTONIC,
RELEASE_USEC, 0,
release_timeout_callback, s);
}
bool session_is_active(Session *s) {
assert(s);
if (!s->seat)
return true;
return s->seat->active == s;
}
static int get_tty_atime(const char *tty, usec_t *atime) {
_cleanup_free_ char *p = NULL;
struct stat st;
assert(tty);
assert(atime);
if (!path_is_absolute(tty)) {
p = path_join("/dev", tty);
if (!p)
return -ENOMEM;
tty = p;
} else if (!path_startswith(tty, "/dev/"))
return -ENOENT;
if (lstat(tty, &st) < 0)
return -errno;
*atime = timespec_load(&st.st_atim);
return 0;
}
static int get_process_ctty_atime(pid_t pid, usec_t *atime) {
_cleanup_free_ char *p = NULL;
int r;
assert(pid > 0);
assert(atime);
r = get_ctty(pid, NULL, &p);
if (r < 0)
return r;
return get_tty_atime(p, atime);
}
int session_get_idle_hint(Session *s, dual_timestamp *t) {
usec_t atime = 0;
int r;
assert(s);
/* Graphical sessions have an explicit idle hint */
if (SESSION_TYPE_IS_GRAPHICAL(s->type)) {
if (t)
*t = s->idle_hint_timestamp;
return s->idle_hint;
}
/* For sessions with an explicitly configured tty, let's check its atime */
if (s->tty) {
r = get_tty_atime(s->tty, &atime);
if (r >= 0)
goto found_atime;
}
/* For sessions with a leader but no explicitly configured tty, let's check the controlling tty of
* the leader */
if (pid_is_valid(s->leader)) {
r = get_process_ctty_atime(s->leader, &atime);
if (r >= 0)
goto found_atime;
}
if (t)
*t = DUAL_TIMESTAMP_NULL;
return false;
found_atime:
if (t)
dual_timestamp_from_realtime(t, atime);
if (s->manager->idle_action_usec <= 0)
return false;
return usec_add(atime, s->manager->idle_action_usec) <= now(CLOCK_REALTIME);
}
int session_set_idle_hint(Session *s, bool b) {
assert(s);
if (!SESSION_TYPE_IS_GRAPHICAL(s->type))
return -ENOTTY;