/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2011 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <string.h>
#include "logind.h"
#include "logind-session.h"
#include "logind-session-device.h"
#include "dbus-common.h"
#include "util.h"
#define BUS_SESSION_INTERFACE \
" <interface name=\"org.freedesktop.login1.Session\">\n" \
" <method name=\"Terminate\"/>\n" \
" <method name=\"Activate\"/>\n" \
" <method name=\"Lock\"/>\n" \
" <method name=\"Unlock\"/>\n" \
" <method name=\"SetIdleHint\">\n" \
" <arg name=\"b\" type=\"b\"/>\n" \
" </method>\n" \
" <method name=\"Kill\">\n" \
" <arg name=\"who\" type=\"s\"/>\n" \
" <arg name=\"signal\" type=\"s\"/>\n" \
" </method>\n" \
" <method name=\"TakeControl\"/>\n" \
" <arg name=\"force\" type=\"b\"/>\n" \
" </method>\n" \
" <method name=\"ReleaseControl\"/>\n" \
" <method name=\"TakeDevice\">\n" \
" <arg name=\"major\" type=\"u\" direction=\"in\"/>\n" \
" <arg name=\"minor\" type=\"u\" direction=\"in\"/>\n" \
" <arg name=\"fd\" type=\"h\" direction=\"out\"/>\n" \
" <arg name=\"paused\" type=\"b\" direction=\"out\"/>\n" \
" </method>\n" \
" <method name=\"ReleaseDevice\">\n" \
" <arg name=\"major\" type=\"u\"/>\n" \
" <arg name=\"minor\" type=\"u\"/>\n" \
" </method>\n" \
" <method name=\"PauseDeviceComplete\">\n" \
" <arg name=\"major\" type=\"u\"/>\n" \
" <arg name=\"minor\" type=\"u\"/>\n" \
" </method>\n" \
" <signal name=\"PauseDevice\">\n" \
" <arg name=\"major\" type=\"u\"/>\n" \
" <arg name=\"minor\" type=\"u\"/>\n" \
" <arg name=\"type\" type=\"s\"/>\n" \
" </signal>\n" \
" <signal name=\"ResumeDevice\">\n" \
" <arg name=\"major\" type=\"u\"/>\n" \
" <arg name=\"minor\" type=\"u\"/>\n" \
" <arg name=\"fd\" type=\"h\"/>\n" \
" </signal>\n" \
" <signal name=\"Lock\"/>\n" \
" <signal name=\"Unlock\"/>\n" \
" <property name=\"Id\" type=\"s\" access=\"read\"/>\n" \
" <property name=\"User\" type=\"(uo)\" access=\"read\"/>\n" \
" <property name=\"Name\" type=\"s\" access=\"read\"/>\n" \
" <property name=\"Timestamp\" type=\"t\" access=\"read\"/>\n" \
" <property name=\"TimestampMonotonic\" type=\"t\" access=\"read\"/>\n" \
" <property name=\"VTNr\" type=\"u\" access=\"read\"/>\n" \
" <property name=\"Seat\" type=\"(so)\" access=\"read\"/>\n" \
" <property name=\"TTY\" type=\"s\" access=\"read\"/>\n" \
" <property name=\"Display\" type=\"s\" access=\"read\"/>\n" \
" <property name=\"Remote\" type=\"b\" access=\"read\"/>\n" \
" <property name=\"RemoteHost\" type=\"s\" access=\"read\"/>\n" \
" <property name=\"RemoteUser\" type=\"s\" access=\"read\"/>\n" \
" <property name=\"Service\" type=\"s\" access=\"read\"/>\n" \
" <property name=\"Scope\" type=\"s\" access=\"read\"/>\n" \
" <property name=\"Leader\" type=\"u\" access=\"read\"/>\n" \
" <property name=\"Audit\" type=\"u\" access=\"read\"/>\n" \
" <property name=\"Type\" type=\"s\" access=\"read\"/>\n" \
" <property name=\"Class\" type=\"s\" access=\"read\"/>\n" \
" <property name=\"Active\" type=\"b\" access=\"read\"/>\n" \
" <property name=\"State\" type=\"s\" access=\"read\"/>\n" \
" <property name=\"IdleHint\" type=\"b\" access=\"read\"/>\n" \
" <property name=\"IdleSinceHint\" type=\"t\" access=\"read\"/>\n" \
" <property name=\"IdleSinceHintMonotonic\" type=\"t\" access=\"read\"/>\n" \
" </interface>\n"
#define INTROSPECTION \
DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE \
"<node>\n" \
BUS_SESSION_INTERFACE \
BUS_PROPERTIES_INTERFACE \
BUS_PEER_INTERFACE \
BUS_INTROSPECTABLE_INTERFACE \
"</node>\n"
#define INTERFACES_LIST \
BUS_GENERIC_INTERFACES_LIST \
"org.freedesktop.login1.Session\0"
static int bus_session_append_seat(DBusMessageIter *i, const char *property, void *data) {
DBusMessageIter sub;
Session *s = data;
const char *id, *path;
char *p = NULL;
assert(i);
assert(property);
assert(s);
if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
return -ENOMEM;
if (s->seat) {
id = s->seat->id;
path = p = seat_bus_path(s->seat);
if (!p)
return -ENOMEM;
} else {
id = "";
path = "/";
}
if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &id) ||
!dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &path))
return -ENOMEM;
if (!dbus_message_iter_close_container(i, &sub))
return -ENOMEM;
return 0;
}
static int bus_session_append_user(DBusMessageIter *i, const char *property, void *data) {
DBusMessageIter sub;
User *u = data;
_cleanup_free_ char *p = NULL;
assert(i);
assert(property);
assert(u);
if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
return -ENOMEM;
p = user_bus_path(u);
if (!p)
return -ENOMEM;
if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &u->uid) ||
!dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p))
return -ENOMEM;
if (!dbus_message_iter_close_container(i, &sub))
return -ENOMEM;
return 0;
}
static int bus_session_append_active(DBusMessageIter *i, const char *property, void *data) {
Session *s = data;
dbus_bool_t b;
assert(i);
assert(property);
assert(s);
b = session_is_active(s);
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
return -ENOMEM;
return 0;
}
static int bus_session_append_idle_hint(DBusMessageIter *i, const char *property, void *data) {
Session *s = data;
int b;
assert(i);
assert(property);
assert(s);
b = session_get_idle_hint(s, NULL) > 0;
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
return -ENOMEM;
return 0;
}
static int bus_session_append_idle_hint_since(DBusMessageIter *i, const char *property, void *data) {
Session *s = data;
dual_timestamp t;
uint64_t u;
int r;
assert(i);
assert(property);
assert(s);
r = session_get_idle_hint(s, &t);
if (r < 0)
return r;
u = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
return -ENOMEM;
return 0;
}
static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_session_append_type, session_type, SessionType);
static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_session_append_class, session_class, SessionClass);
static int bus_session_append_state(DBusMessageIter *i, const char *property, void *data) {
Session *s = data;
const char *state;
assert(i);
assert(property);
assert(s);
state = session_state_to_string(session_get_state(s));
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state))
return -ENOMEM;
return 0;
}
static int get_session_for_path(Manager *m, const char *path, Session **_s) {
_cleanup_free_ char *id = NULL;
Session *s;
assert(m);
assert(path);
assert(_s);
if (!startswith(path, "/org/freedesktop/login1/session/"))
return -EINVAL;
id = bus_path_unescape(path + 32);
if (!id)
return -ENOMEM;
s = hashmap_get(m->sessions, id);
if (!s)
return -ENOENT;
*_s = s;
return 0;
}
static const BusProperty bus_login_session_properties[] = {
{ "Id", bus_property_append_string, "s", offsetof(Session, id), true },
{ "Timestamp", bus_property_append_usec, "t", offsetof(Session, timestamp.realtime) },
{ "TimestampMonotonic", bus_property_append_usec, "t", offsetof(Session, timestamp.monotonic) },
{ "VTNr", bus_property_append_uint32, "u", offsetof(Session, vtnr) },
{ "Seat", bus_session_append_seat, "(so)", 0 },
{ "TTY", bus_property_append_string, "s", offsetof(Session, tty), true },
{ "Display", bus_property_append_string, "s", offsetof(Session, display), true },
{ "Remote", bus_property_append_bool, "b", offsetof(Session, remote) },
{ "RemoteUser", bus_property_append_string, "s", offsetof(Session, remote_user), true },
{ "RemoteHost", bus_property_append_string, "s", offsetof(Session, remote_host), true },
{ "Service", bus_property_append_string, "s", offsetof(Session, service), true },
{ "Scope", bus_property_append_string, "s", offsetof(Session, scope), true },
{ "Leader", bus_property_append_pid, "u", offsetof(Session, leader) },
{ "Audit", bus_property_append_uint32, "u", offsetof(Session, audit_id) },
{ "Type", bus_session_append_type, "s", offsetof(Session, type) },
{ "Class", bus_session_append_class, "s", offsetof(Session, class) },
{ "Active", bus_session_append_active, "b", 0 },
{ "State", bus_session_append_state, "s", 0 },
{ "IdleHint", bus_session_append_idle_hint, "b", 0 },
{ "IdleSinceHint", bus_session_append_idle_hint_since, "t", 0 },
{ "IdleSinceHintMonotonic", bus_session_append_idle_hint_since, "t", 0 },
{ NULL, }
};
static const BusProperty bus_login_session_user_properties[] = {
{ "User", bus_session_append_user, "(uo)", 0 },
{ "Name", bus_property_append_string, "s", offsetof(User, name), true },
{ NULL, }
};
static DBusHandlerResult session_message_dispatch(
Session *s,
DBusConnection *connection,
DBusMessage *message) {
DBusError error;
_cleanup_dbus_message_unref_ DBusMessage *reply = NULL;
int r;
assert(s);
assert(connection);
assert(message);
dbus_error_init(&error);
if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Terminate")) {
r = session_stop(s);
if (r < 0)
return bus_send_error_reply(connection, message, NULL, r);
reply = dbus_message_new_method_return(message);
if (!reply)
goto oom;
} else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Activate")) {
r = session_activate(s);
if (r < 0)
return bus_send_error_reply(connection, message, NULL, r);
reply = dbus_message_new_method_return(message);
if (!reply)
goto oom;
} else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Lock") ||
dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Unlock")) {
if (session_send_lock(s, streq(dbus_message_get_member(message), "Lock")) < 0)
goto oom;
reply = dbus_message_new_method_return(message);
if (!reply)
goto oom;
} else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "SetIdleHint")) {
dbus_bool_t b;
unsigned long ul;
if (!dbus_message_get_args(
message,
&error,
DBUS_TYPE_BOOLEAN, &b,
DBUS_TYPE_INVALID))
return bus_send_error_reply(connection, message, &error, -EINVAL);
ul = dbus_bus_get_unix_user(connection, dbus_message_get_sender(message), &error);
if (ul == (unsigned long) -1)
return bus_send_error_reply(connection, message, &error, -EIO);
if (ul != 0 && ul != s->user->uid)
return bus_send_error_reply(connection, message, NULL, -EPERM);
session_set_idle_hint(s, b);
reply = dbus_message_new_method_return(message);
if (!reply)
goto oom;
} else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Kill")) {
const char *swho;
int32_t signo;
KillWho who;
if (!dbus_message_get_args(
message,
&error,
DBUS_TYPE_STRING, &swho,
DBUS_TYPE_INT32, &signo,
DBUS_TYPE_INVALID))
return bus_send_error_reply(connection, message, &error, -EINVAL);
if (isempty(swho))
who = KILL_ALL;
else {
who = kill_who_from_string(swho);
if (who < 0)
return bus_send_error_reply(connection, message, &error, -EINVAL);
}
if (signo <= 0 || signo >= _NSIG)
return bus_send_error_reply(connection, message, &error, -EINVAL);
r = session_kill(s, who, signo);
if (r < 0)
return bus_send_error_reply(connection, message, NULL, r);
reply = dbus_message_new_method_return(message);
if (!reply)
goto oom;
} else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "TakeControl")) {
dbus_bool_t force;
unsigned long ul;
if (!dbus_message_get_args(
message,
&error,
DBUS_TYPE_BOOLEAN, &force,
DBUS_TYPE_INVALID))
return bus_send_error_reply(connection, message, &error, -EINVAL);
ul = dbus_bus_get_unix_user(connection, dbus_message_get_sender(message), &error);
if (ul == (unsigned long) -1)
return bus_send_error_reply(connection, message, &error, -EIO);
if (ul != 0 && (force || ul != s->user->uid))
return bus_send_error_reply(connection, message, NULL, -EPERM);
r = session_set_controller(s, bus_message_get_sender_with_fallback(message), force);
if (r < 0)
return bus_send_error_reply(connection, message, NULL, r);
reply = dbus_message_new_method_return(message);
if (!reply)
goto oom;
} else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "ReleaseControl")) {
const char *sender = bus_message_get_sender_with_fallback(message);
if (!session_is_controller(s, sender))
return bus_send_error_reply(connection, message, NULL, -EPERM);
session_drop_controller(s);
reply = dbus_message_new_method_return(message);
if (!reply)
goto oom;
} else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "TakeDevice")) {
SessionDevice *sd;
bool b;
dbus_bool_t paused;
uint32_t major, minor;
dev_t dev;
if (!session_is_controller(s, bus_message_get_sender_with_fallback(message)))
return bus_send_error_reply(connection, message, NULL, -EPERM);
if (!dbus_message_get_args(
message,
&error,
DBUS_TYPE_UINT32, &major,
DBUS_TYPE_UINT32, &minor,
DBUS_TYPE_INVALID))
return bus_send_error_reply(connection, message, &error, -EINVAL);
dev = makedev(major, minor);
sd = hashmap_get(s->devices, &dev);
if (sd) {
/* We don't allow retrieving a device multiple times.
* The related ReleaseDevice call is not ref-counted.
* The caller should use dup() if it requires more than
* one fd (it would be functionally equivalent). */
return bus_send_error_reply(connection, message, &error, -EBUSY);
}
r = session_device_new(s, dev, &sd);
if (r < 0)
return bus_send_error_reply(connection, message, NULL, r);
reply = dbus_message_new_method_return(message);
if (!reply) {
session_device_free(sd);
goto oom;
}
paused = !sd->active;
b = dbus_message_append_args(
reply,
DBUS_TYPE_UNIX_FD, &sd->fd,
DBUS_TYPE_BOOLEAN, &paused,
DBUS_TYPE_INVALID);
if (!b) {
session_device_free(sd);
return bus_send_error_reply(connection, message, NULL, -ENOMEM);
}
} else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "ReleaseDevice")) {
SessionDevice *sd;
uint32_t major, minor;
dev_t dev;
if (!session_is_controller(s, bus_message_get_sender_with_fallback(message)))
return bus_send_error_reply(connection, message, NULL, -EPERM);
if (!dbus_message_get_args(
message,
&error,
DBUS_TYPE_UINT32, &major,
DBUS_TYPE_UINT32, &minor,
DBUS_TYPE_INVALID))
return bus_send_error_reply(connection, message, &error, -EINVAL);
dev = makedev(major, minor);
sd = hashmap_get(s->devices, &dev);
if (!sd)
return bus_send_error_reply(connection, message, NULL, -ENODEV);
session_device_free(sd);
reply = dbus_message_new_method_return(message);
if (!reply)
goto oom;
} else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "PauseDeviceComplete")) {
SessionDevice *sd;
uint32_t major, minor;
dev_t dev;
if (!session_is_controller(s, bus_message_get_sender_with_fallback(message)))
return bus_send_error_reply(connection, message, NULL, -EPERM);
if (!dbus_message_get_args(
message,
&error,
DBUS_TYPE_UINT32, &major,
DBUS_TYPE_UINT32, &minor,
DBUS_TYPE_INVALID))
return bus_send_error_reply(connection, message, &error, -EINVAL);
dev = makedev(major, minor);
sd = hashmap_get(s->devices, &dev);
if (!sd)
return bus_send_error_reply(connection, message, NULL, -ENODEV);
session_device_complete_pause(sd);
reply = dbus_message_new_method_return(message);
if (!reply)
goto oom;
} else {
const BusBoundProperties bps[] = {
{ "org.freedesktop.login1.Session", bus_login_session_properties, s },
{ "org.freedesktop.login1.Session", bus_login_session_user_properties, s->user },
{ NULL, }
};
return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, bps);
}
if (reply) {
if (!bus_maybe_send_reply(connection, message, reply))
goto oom;
}
return DBUS_HANDLER_RESULT_HANDLED;
oom:
dbus_error_free(&error);
return DBUS_HANDLER_RESULT_NEED_MEMORY;
}
static DBusHandlerResult session_message_handler(
DBusConnection *connection,
DBusMessage *message,
void *userdata) {
Manager *m = userdata;
Session *s;
int r;
r = get_session_for_path(m, dbus_message_get_path(message), &s);
if (r < 0) {
if (r == -ENOMEM)
return DBUS_HANDLER_RESULT_NEED_MEMORY;
if (r == -ENOENT) {
DBusError e;
dbus_error_init(&e);
dbus_set_error_const(&e, DBUS_ERROR_UNKNOWN_OBJECT, "Unknown session");
return bus_send_error_reply(connection, message, &e, r);
}
return bus_send_error_reply(connection, message, NULL, r);
}
return session_message_dispatch(s, connection, message);
}
const DBusObjectPathVTable bus_session_vtable = {
.message_function = session_message_handler
};
char *session_bus_path(Session *s) {
_cleanup_free_ char *t = NULL;
assert(s);
t = bus_path_escape(s->id);
if (!t)
return NULL;
return strappend("/org/freedesktop/login1/session/", t);
}
int session_send_signal(Session *s, bool new_session) {
_cleanup_dbus_message_unref_ DBusMessage *m = NULL;
_cleanup_free_ char *p = NULL;
assert(s);
m = dbus_message_new_signal("/org/freedesktop/login1",
"org.freedesktop.login1.Manager",
new_session ? "SessionNew" : "SessionRemoved");
if (!m)
return -ENOMEM;
p = session_bus_path(s);
if (!p)
return -ENOMEM;
if (!dbus_message_append_args(
m,
DBUS_TYPE_STRING, &s->id,
DBUS_TYPE_OBJECT_PATH, &p,
DBUS_TYPE_INVALID))
return -ENOMEM;
if (!dbus_connection_send(s->manager->bus, m, NULL))
return -ENOMEM;
return 0;
}
int session_send_changed(Session *s, const char *properties) {
_cleanup_dbus_message_unref_ DBusMessage *m = NULL;
_cleanup_free_ char *p = NULL;
assert(s);
if (!s->started)
return 0;
p = session_bus_path(s);
if (!p)
return -ENOMEM;
m = bus_properties_changed_new(p, "org.freedesktop.login1.Session", properties);
if (!m)
return -ENOMEM;
if (!dbus_connection_send(s->manager->bus, m, NULL))
return -ENOMEM;
return 0;
}
int session_send_lock(Session *s, bool lock) {
_cleanup_dbus_message_unref_ DBusMessage *m = NULL;
bool b;
_cleanup_free_ char *p = NULL;
assert(s);
p = session_bus_path(s);
if (!p)
return -ENOMEM;
m = dbus_message_new_signal(p, "org.freedesktop.login1.Session", lock ? "Lock" : "Unlock");
if (!m)
return -ENOMEM;
b = dbus_connection_send(s->manager->bus, m, NULL);
if (!b)
return -ENOMEM;
return 0;
}
int session_send_lock_all(Manager *m, bool lock) {
Session *session;
Iterator i;
int r = 0;
assert(m);
HASHMAP_FOREACH(session, m->sessions, i) {
int k;
k = session_send_lock(session, lock);
if (k < 0)
r = k;
}
return r;
}
int session_send_create_reply(Session *s, DBusError *error) {
_cleanup_dbus_message_unref_ DBusMessage *reply = NULL;
assert(s);
if (!s->create_message)
return 0;
/* This is called after the session scope was successfully
* created, and finishes where bus_manager_create_session()
* left off. */
if (error) {
DBusError buffer;
dbus_error_init(&buffer);
if (!dbus_error_is_set(error)) {
dbus_set_error_const(&buffer, DBUS_ERROR_INVALID_ARGS, "Invalid Arguments");
error = &buffer;
}
reply = dbus_message_new_error(s->create_message, error->name, error->message);
dbus_error_free(&buffer);
if (!reply)
return log_oom();
} else {
_cleanup_close_ int fifo_fd = -1;
_cleanup_free_ char *path = NULL;
const char *cseat;
uint32_t vtnr;
dbus_bool_t exists;
fifo_fd = session_create_fifo(s);
if (fifo_fd < 0) {
log_error("Failed to create fifo: %s", strerror(-fifo_fd));
return fifo_fd;
}
path = session_bus_path(s);
if (!path)
return log_oom();
reply = dbus_message_new_method_return(s->create_message);
if (!reply)
return log_oom();
cseat = s->seat ? s->seat->id : "";
vtnr = s->vtnr;
exists = false;
if (!dbus_message_append_args(
reply,
DBUS_TYPE_STRING, &s->id,
DBUS_TYPE_OBJECT_PATH, &path,
DBUS_TYPE_STRING, &s->user->runtime_path,
DBUS_TYPE_UNIX_FD, &fifo_fd,
DBUS_TYPE_STRING, &cseat,
DBUS_TYPE_UINT32, &vtnr,
DBUS_TYPE_BOOLEAN, &exists,
DBUS_TYPE_INVALID))
return log_oom();
}
/* Update the state file before we notify the client about the
* result */
session_save(s);
if (!dbus_connection_send(s->manager->bus, reply, NULL))
return log_oom();
dbus_message_unref(s->create_message);
s->create_message = NULL;
return 0;
}