[thirdparty/systemd.git] / src / core / dbus-scope.c

/* SPDX-License-Identifier: LGPL-2.1+ */

#include "alloc-util.h"
#include "bus-common-errors.h"
#include "bus-internal.h"
#include "bus-util.h"
#include "dbus-cgroup.h"
#include "dbus-kill.h"
#include "dbus-scope.h"
#include "dbus-unit.h"
#include "dbus-util.h"
#include "dbus.h"
#include "scope.h"
#include "selinux-access.h"
#include "unit.h"

int bus_scope_method_abandon(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Scope *s = userdata;
        int r;

        assert(message);
        assert(s);

        r = mac_selinux_unit_access_check(UNIT(s), message, "stop", error);
        if (r < 0)
                return r;

        r = bus_verify_manage_units_async(UNIT(s)->manager, message, error);
        if (r < 0)
                return r;
        if (r == 0)
                return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */

        r = scope_abandon(s);
        if (r == -ESTALE)
                return sd_bus_error_setf(error, BUS_ERROR_SCOPE_NOT_RUNNING, "Scope %s is not running, cannot abandon.", UNIT(s)->id);
        if (r < 0)
                return r;

        return sd_bus_reply_method_return(message, NULL);
}

static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_result, scope_result, ScopeResult);

const sd_bus_vtable bus_scope_vtable[] = {
        SD_BUS_VTABLE_START(0),
        SD_BUS_PROPERTY("Controller", "s", NULL, offsetof(Scope, controller), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
        SD_BUS_PROPERTY("TimeoutStopUSec", "t", bus_property_get_usec, offsetof(Scope, timeout_stop_usec), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("Result", "s", property_get_result, offsetof(Scope, result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
        SD_BUS_PROPERTY("RuntimeMaxUSec", "t", bus_property_get_usec, offsetof(Scope, runtime_max_usec), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_SIGNAL("RequestStop", NULL, 0),
        SD_BUS_METHOD("Abandon", NULL, NULL, bus_scope_method_abandon, SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_VTABLE_END
};

static int bus_scope_set_transient_property(
                Scope *s,
                const char *name,
                sd_bus_message *message,
                UnitWriteFlags flags,
                sd_bus_error *error) {

        Unit *u = UNIT(s);
        int r;

        assert(s);
        assert(name);
        assert(message);

        flags |= UNIT_PRIVATE;

        if (streq(name, "TimeoutStopUSec"))
                return bus_set_transient_usec(u, name, &s->timeout_stop_usec, message, flags, error);

        if (streq(name, "RuntimeMaxUSec"))
                return bus_set_transient_usec(u, name, &s->runtime_max_usec, message, flags, error);

        if (streq(name, "PIDs")) {
                _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
                unsigned n = 0;

                r = sd_bus_message_enter_container(message, 'a', "u");
                if (r < 0)
                        return r;

                for (;;) {
                        uint32_t upid;
                        pid_t pid;

                        r = sd_bus_message_read(message, "u", &upid);
                        if (r < 0)
                                return r;
                        if (r == 0)
                                break;

                        if (upid == 0) {
                                if (!creds) {
                                        r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
                                        if (r < 0)
                                                return r;
                                }

                                r = sd_bus_creds_get_pid(creds, &pid);
                                if (r < 0)
                                        return r;
                        } else
                                pid = (uid_t) upid;

                        r = unit_pid_attachable(u, pid, error);
                        if (r < 0)
                                return r;

                        if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
                                r = unit_watch_pid(u, pid, false);
                                if (r < 0 && r != -EEXIST)
                                        return r;
                        }

                        n++;
                }

                r = sd_bus_message_exit_container(message);
                if (r < 0)
                        return r;

                if (n <= 0)
                        return -EINVAL;

                return 1;

        } else if (streq(name, "Controller")) {
                const char *controller;

                /* We can't support direct connections with this, as direct connections know no service or unique name
                 * concept, but the Controller field stores exactly that. */
                if (sd_bus_message_get_bus(message) != u->manager->api_bus)
                        return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Sorry, Controller= logic only supported via the bus.");

                r = sd_bus_message_read(message, "s", &controller);
                if (r < 0)
                        return r;

                if (!isempty(controller) && !service_name_is_valid(controller))
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Controller '%s' is not a valid bus name.", controller);

                if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
                        r = free_and_strdup(&s->controller, empty_to_null(controller));
                        if (r < 0)
                                return r;
                }

                return 1;
        }

        return 0;
}

int bus_scope_set_property(
                Unit *u,
                const char *name,
                sd_bus_message *message,
                UnitWriteFlags flags,
                sd_bus_error *error) {

        Scope *s = SCOPE(u);
        int r;

        assert(s);
        assert(name);
        assert(message);

        r = bus_cgroup_set_property(u, &s->cgroup_context, name, message, flags, error);
        if (r != 0)
                return r;

        if (u->load_state == UNIT_STUB) {
                /* While we are created we still accept PIDs */

                r = bus_scope_set_transient_property(s, name, message, flags, error);
                if (r != 0)
                        return r;

                r = bus_kill_context_set_transient_property(u, &s->kill_context, name, message, flags, error);
                if (r != 0)
                        return r;
        }

        return 0;
}

int bus_scope_commit_properties(Unit *u) {
        assert(u);

        unit_invalidate_cgroup_members_masks(u);
        unit_realize_cgroup(u);

        return 0;
}

int bus_scope_send_request_stop(Scope *s) {
        _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
        _cleanup_free_ char *p = NULL;
        int r;

        assert(s);

        if (!s->controller)
                return 0;

        p = unit_dbus_path(UNIT(s));
        if (!p)
                return -ENOMEM;

        r = sd_bus_message_new_signal(
                        UNIT(s)->manager->api_bus,
                        &m,
                        p,
                        "org.freedesktop.systemd1.Scope",
                        "RequestStop");
        if (r < 0)
                return r;

        return sd_bus_send_to(UNIT(s)->manager->api_bus, m, s->controller, NULL);
}

static int on_controller_gone(sd_bus_track *track, void *userdata) {
        Scope *s = userdata;

        assert(track);

        if (s->controller) {
                log_unit_debug(UNIT(s), "Controller %s disappeared from bus.", s->controller);
                unit_add_to_dbus_queue(UNIT(s));
                s->controller = mfree(s->controller);
        }

        s->controller_track = sd_bus_track_unref(s->controller_track);

        return 0;
}

int bus_scope_track_controller(Scope *s) {
        int r;

        assert(s);

        if (!s->controller || s->controller_track)
                return 0;

        r = sd_bus_track_new(UNIT(s)->manager->api_bus, &s->controller_track, on_controller_gone, s);
        if (r < 0)
                return r;

        r = sd_bus_track_add_name(s->controller_track, s->controller);
        if (r < 0) {
                s->controller_track = sd_bus_track_unref(s->controller_track);
                return r;
        }

        return 0;
}
Commit	Line	Data
	1	/* SPDX-License-Identifier: LGPL-2.1+ */
	2
	3	#include "alloc-util.h"
	4	#include "bus-common-errors.h"
	5	#include "bus-internal.h"
	6	#include "bus-util.h"
	7	#include "dbus-cgroup.h"
	8	#include "dbus-kill.h"
	9	#include "dbus-scope.h"
	10	#include "dbus-unit.h"
	11	#include "dbus-util.h"
	12	#include "dbus.h"
	13	#include "scope.h"
	14	#include "selinux-access.h"
	15	#include "unit.h"
	16
	17	int bus_scope_method_abandon(sd_bus_message message, void userdata, sd_bus_error *error) {
	18	Scope *s = userdata;
	19	int r;
	20
	21	assert(message);
	22	assert(s);
	23
	24	r = mac_selinux_unit_access_check(UNIT(s), message, "stop", error);
	25	if (r < 0)
	26	return r;
	27
	28	r = bus_verify_manage_units_async(UNIT(s)->manager, message, error);
	29	if (r < 0)
	30	return r;
	31	if (r == 0)
	32	return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
	33
	34	r = scope_abandon(s);
	35	if (r == -ESTALE)
	36	return sd_bus_error_setf(error, BUS_ERROR_SCOPE_NOT_RUNNING, "Scope %s is not running, cannot abandon.", UNIT(s)->id);
	37	if (r < 0)
	38	return r;
	39
	40	return sd_bus_reply_method_return(message, NULL);
	41	}
	42
	43	static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_result, scope_result, ScopeResult);
	44
	45	const sd_bus_vtable bus_scope_vtable[] = {
	46	SD_BUS_VTABLE_START(0),
	47	SD_BUS_PROPERTY("Controller", "s", NULL, offsetof(Scope, controller), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
	48	SD_BUS_PROPERTY("TimeoutStopUSec", "t", bus_property_get_usec, offsetof(Scope, timeout_stop_usec), SD_BUS_VTABLE_PROPERTY_CONST),
	49	SD_BUS_PROPERTY("Result", "s", property_get_result, offsetof(Scope, result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
	50	SD_BUS_PROPERTY("RuntimeMaxUSec", "t", bus_property_get_usec, offsetof(Scope, runtime_max_usec), SD_BUS_VTABLE_PROPERTY_CONST),
	51	SD_BUS_SIGNAL("RequestStop", NULL, 0),
	52	SD_BUS_METHOD("Abandon", NULL, NULL, bus_scope_method_abandon, SD_BUS_VTABLE_UNPRIVILEGED),
	53	SD_BUS_VTABLE_END
	54	};
	55
	56	static int bus_scope_set_transient_property(
	57	Scope *s,
	58	const char *name,
	59	sd_bus_message *message,
	60	UnitWriteFlags flags,
	61	sd_bus_error *error) {
	62
	63	Unit *u = UNIT(s);
	64	int r;
	65
	66	assert(s);
	67	assert(name);
	68	assert(message);
	69
	70	flags \|= UNIT_PRIVATE;
	71
	72	if (streq(name, "TimeoutStopUSec"))
	73	return bus_set_transient_usec(u, name, &s->timeout_stop_usec, message, flags, error);
	74
	75	if (streq(name, "RuntimeMaxUSec"))
	76	return bus_set_transient_usec(u, name, &s->runtime_max_usec, message, flags, error);
	77
	78	if (streq(name, "PIDs")) {
	79	_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
	80	unsigned n = 0;
	81
	82	r = sd_bus_message_enter_container(message, 'a', "u");
	83	if (r < 0)
	84	return r;
	85
	86	for (;;) {
	87	uint32_t upid;
	88	pid_t pid;
	89
	90	r = sd_bus_message_read(message, "u", &upid);
	91	if (r < 0)
	92	return r;
	93	if (r == 0)
	94	break;
	95
	96	if (upid == 0) {
	97	if (!creds) {
	98	r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
	99	if (r < 0)
	100	return r;
	101	}
	102
	103	r = sd_bus_creds_get_pid(creds, &pid);
	104	if (r < 0)
	105	return r;
	106	} else
	107	pid = (uid_t) upid;
	108
	109	r = unit_pid_attachable(u, pid, error);
	110	if (r < 0)
	111	return r;
	112
	113	if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
	114	r = unit_watch_pid(u, pid, false);
	115	if (r < 0 && r != -EEXIST)
	116	return r;
	117	}
	118
	119	n++;
	120	}
	121
	122	r = sd_bus_message_exit_container(message);
	123	if (r < 0)
	124	return r;
	125
	126	if (n <= 0)
	127	return -EINVAL;
	128
	129	return 1;
	130
	131	} else if (streq(name, "Controller")) {
	132	const char *controller;
	133
	134	/* We can't support direct connections with this, as direct connections know no service or unique name
	135	* concept, but the Controller field stores exactly that. */
	136	if (sd_bus_message_get_bus(message) != u->manager->api_bus)
	137	return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Sorry, Controller= logic only supported via the bus.");
	138
	139	r = sd_bus_message_read(message, "s", &controller);
	140	if (r < 0)
	141	return r;
	142
	143	if (!isempty(controller) && !service_name_is_valid(controller))
	144	return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Controller '%s' is not a valid bus name.", controller);
	145
	146	if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
	147	r = free_and_strdup(&s->controller, empty_to_null(controller));
	148	if (r < 0)
	149	return r;
	150	}
	151
	152	return 1;
	153	}
	154
	155	return 0;
	156	}
	157
	158	int bus_scope_set_property(
	159	Unit *u,
	160	const char *name,
	161	sd_bus_message *message,
	162	UnitWriteFlags flags,
	163	sd_bus_error *error) {
	164
	165	Scope *s = SCOPE(u);
	166	int r;
	167
	168	assert(s);
	169	assert(name);
	170	assert(message);
	171
	172	r = bus_cgroup_set_property(u, &s->cgroup_context, name, message, flags, error);
	173	if (r != 0)
	174	return r;
	175
	176	if (u->load_state == UNIT_STUB) {
	177	/* While we are created we still accept PIDs */
	178
	179	r = bus_scope_set_transient_property(s, name, message, flags, error);
	180	if (r != 0)
	181	return r;
	182
	183	r = bus_kill_context_set_transient_property(u, &s->kill_context, name, message, flags, error);
	184	if (r != 0)
	185	return r;
	186	}
	187
	188	return 0;
	189	}
	190
	191	int bus_scope_commit_properties(Unit *u) {
	192	assert(u);
	193
	194	unit_invalidate_cgroup_members_masks(u);
	195	unit_realize_cgroup(u);
	196
	197	return 0;
	198	}
	199
	200	int bus_scope_send_request_stop(Scope *s) {
	201	_cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
	202	_cleanup_free_ char *p = NULL;
	203	int r;
	204
	205	assert(s);
	206
	207	if (!s->controller)
	208	return 0;
	209
	210	p = unit_dbus_path(UNIT(s));
	211	if (!p)
	212	return -ENOMEM;
	213
	214	r = sd_bus_message_new_signal(
	215	UNIT(s)->manager->api_bus,
	216	&m,
	217	p,
	218	"org.freedesktop.systemd1.Scope",
	219	"RequestStop");
	220	if (r < 0)
	221	return r;
	222
	223	return sd_bus_send_to(UNIT(s)->manager->api_bus, m, s->controller, NULL);
	224	}
	225
	226	static int on_controller_gone(sd_bus_track track, void userdata) {
	227	Scope *s = userdata;
	228
	229	assert(track);
	230
	231	if (s->controller) {
	232	log_unit_debug(UNIT(s), "Controller %s disappeared from bus.", s->controller);
	233	unit_add_to_dbus_queue(UNIT(s));
	234	s->controller = mfree(s->controller);
	235	}
	236
	237	s->controller_track = sd_bus_track_unref(s->controller_track);
	238
	239	return 0;
	240	}
	241
	242	int bus_scope_track_controller(Scope *s) {
	243	int r;
	244
	245	assert(s);
	246
	247	if (!s->controller \|\| s->controller_track)
	248	return 0;
	249
	250	r = sd_bus_track_new(UNIT(s)->manager->api_bus, &s->controller_track, on_controller_gone, s);
	251	if (r < 0)
	252	return r;
	253
	254	r = sd_bus_track_add_name(s->controller_track, s->controller);
	255	if (r < 0) {
	256	s->controller_track = sd_bus_track_unref(s->controller_track);
	257	return r;
	258	}
	259
	260	return 0;
	261	}