diff options
Diffstat (limited to 'src/login/logind-seat-dbus.c')
| -rw-r--r-- | src/login/logind-seat-dbus.c | 443 |
1 files changed, 443 insertions, 0 deletions
diff --git a/src/login/logind-seat-dbus.c b/src/login/logind-seat-dbus.c new file mode 100644 index 0000000..03a4192 --- /dev/null +++ b/src/login/logind-seat-dbus.c @@ -0,0 +1,443 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <errno.h> + +#include "alloc-util.h" +#include "bus-common-errors.h" +#include "bus-get-properties.h" +#include "bus-label.h" +#include "bus-polkit.h" +#include "bus-util.h" +#include "logind-dbus.h" +#include "logind-polkit.h" +#include "logind-seat-dbus.h" +#include "logind-seat.h" +#include "logind-session-dbus.h" +#include "logind.h" +#include "missing_capability.h" +#include "strv.h" +#include "user-util.h" +#include "util.h" + +static BUS_DEFINE_PROPERTY_GET_GLOBAL(property_get_const_true, "b", true); +static BUS_DEFINE_PROPERTY_GET(property_get_can_tty, "b", Seat, seat_can_tty); +static BUS_DEFINE_PROPERTY_GET(property_get_can_graphical, "b", Seat, seat_can_graphical); + +static int property_get_active_session( + sd_bus *bus, + const char *path, + const char *interface, + const char *property, + sd_bus_message *reply, + void *userdata, + sd_bus_error *error) { + + _cleanup_free_ char *p = NULL; + Seat *s = ASSERT_PTR(userdata); + + assert(bus); + assert(reply); + + p = s->active ? session_bus_path(s->active) : strdup("/"); + if (!p) + return -ENOMEM; + + return sd_bus_message_append(reply, "(so)", s->active ? s->active->id : "", p); +} + +static int property_get_sessions( + sd_bus *bus, + const char *path, + const char *interface, + const char *property, + sd_bus_message *reply, + void *userdata, + sd_bus_error *error) { + + Seat *s = ASSERT_PTR(userdata); + int r; + + assert(bus); + assert(reply); + + r = sd_bus_message_open_container(reply, 'a', "(so)"); + if (r < 0) + return r; + + LIST_FOREACH(sessions_by_seat, session, s->sessions) { + _cleanup_free_ char *p = NULL; + + p = session_bus_path(session); + if (!p) + return -ENOMEM; + + r = sd_bus_message_append(reply, "(so)", session->id, p); + if (r < 0) + return r; + + } + + r = sd_bus_message_close_container(reply); + if (r < 0) + return r; + + return 1; +} + +static int property_get_idle_hint( + sd_bus *bus, + const char *path, + const char *interface, + const char *property, + sd_bus_message *reply, + void *userdata, + sd_bus_error *error) { + + Seat *s = ASSERT_PTR(userdata); + + assert(bus); + assert(reply); + + return sd_bus_message_append(reply, "b", seat_get_idle_hint(s, NULL) > 0); +} + +static int property_get_idle_since_hint( + sd_bus *bus, + const char *path, + const char *interface, + const char *property, + sd_bus_message *reply, + void *userdata, + sd_bus_error *error) { + + Seat *s = ASSERT_PTR(userdata); + dual_timestamp t; + uint64_t u; + int r; + + assert(bus); + assert(reply); + + r = seat_get_idle_hint(s, &t); + if (r < 0) + return r; + + u = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic; + + return sd_bus_message_append(reply, "t", u); +} + +int bus_seat_method_terminate(sd_bus_message *message, void *userdata, sd_bus_error *error) { + Seat *s = ASSERT_PTR(userdata); + int r; + + assert(message); + + r = bus_verify_polkit_async( + message, + CAP_KILL, + "org.freedesktop.login1.manage", + NULL, + false, + UID_INVALID, + &s->manager->polkit_registry, + error); + if (r < 0) + return r; + if (r == 0) + return 1; /* Will call us back */ + + r = seat_stop_sessions(s, /* force = */ true); + if (r < 0) + return r; + + return sd_bus_reply_method_return(message, NULL); +} + +static int method_activate_session(sd_bus_message *message, void *userdata, sd_bus_error *error) { + Seat *s = ASSERT_PTR(userdata); + const char *name; + Session *session; + int r; + + assert(message); + + r = sd_bus_message_read(message, "s", &name); + if (r < 0) + return r; + + session = hashmap_get(s->manager->sessions, name); + if (!session) + return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SESSION, "No session '%s' known", name); + + if (session->seat != s) + return sd_bus_error_setf(error, BUS_ERROR_SESSION_NOT_ON_SEAT, "Session %s not on seat %s", name, s->id); + + r = check_polkit_chvt(message, s->manager, error); + if (r < 0) + return r; + if (r == 0) + return 1; /* Will call us back */ + + r = session_activate(session); + if (r < 0) + return r; + + return sd_bus_reply_method_return(message, NULL); +} + +static int method_switch_to(sd_bus_message *message, void *userdata, sd_bus_error *error) { + Seat *s = ASSERT_PTR(userdata); + unsigned to; + int r; + + assert(message); + + r = sd_bus_message_read(message, "u", &to); + if (r < 0) + return r; + + if (to <= 0) + return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid virtual terminal"); + + r = check_polkit_chvt(message, s->manager, error); + if (r < 0) + return r; + if (r == 0) + return 1; /* Will call us back */ + + r = seat_switch_to(s, to); + if (r < 0) + return r; + + return sd_bus_reply_method_return(message, NULL); +} + +static int method_switch_to_next(sd_bus_message *message, void *userdata, sd_bus_error *error) { + Seat *s = ASSERT_PTR(userdata); + int r; + + assert(message); + + r = check_polkit_chvt(message, s->manager, error); + if (r < 0) + return r; + if (r == 0) + return 1; /* Will call us back */ + + r = seat_switch_to_next(s); + if (r < 0) + return r; + + return sd_bus_reply_method_return(message, NULL); +} + +static int method_switch_to_previous(sd_bus_message *message, void *userdata, sd_bus_error *error) { + Seat *s = ASSERT_PTR(userdata); + int r; + + assert(message); + + r = check_polkit_chvt(message, s->manager, error); + if (r < 0) + return r; + if (r == 0) + return 1; /* Will call us back */ + + r = seat_switch_to_previous(s); + if (r < 0) + return r; + + return sd_bus_reply_method_return(message, NULL); +} + +static int seat_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) { + _cleanup_free_ char *e = NULL; + sd_bus_message *message; + Manager *m = ASSERT_PTR(userdata); + const char *p; + Seat *seat; + int r; + + assert(bus); + assert(path); + assert(interface); + assert(found); + + p = startswith(path, "/org/freedesktop/login1/seat/"); + if (!p) + return 0; + + e = bus_label_unescape(p); + if (!e) + return -ENOMEM; + + message = sd_bus_get_current_message(bus); + + r = manager_get_seat_from_creds(m, message, e, error, &seat); + if (r == -ENXIO) { + sd_bus_error_free(error); + return 0; + } + if (r < 0) + return r; + + *found = seat; + return 1; +} + +char *seat_bus_path(Seat *s) { + _cleanup_free_ char *t = NULL; + + assert(s); + + t = bus_label_escape(s->id); + if (!t) + return NULL; + + return strjoin("/org/freedesktop/login1/seat/", t); +} + +static int seat_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) { + _cleanup_strv_free_ char **l = NULL; + sd_bus_message *message; + Manager *m = userdata; + Seat *seat; + int r; + + assert(bus); + assert(path); + assert(nodes); + + HASHMAP_FOREACH(seat, m->seats) { + char *p; + + p = seat_bus_path(seat); + if (!p) + return -ENOMEM; + + r = strv_consume(&l, p); + if (r < 0) + return r; + } + + message = sd_bus_get_current_message(bus); + if (message) { + _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL; + + r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID|SD_BUS_CREDS_AUGMENT, &creds); + if (r >= 0) { + bool may_auto = false; + const char *name; + + r = sd_bus_creds_get_session(creds, &name); + if (r >= 0) { + Session *session; + + session = hashmap_get(m->sessions, name); + if (session && session->seat) { + r = strv_extend(&l, "/org/freedesktop/login1/seat/self"); + if (r < 0) + return r; + + may_auto = true; + } + } + + if (!may_auto) { + uid_t uid; + + r = sd_bus_creds_get_owner_uid(creds, &uid); + if (r >= 0) { + User *user; + + user = hashmap_get(m->users, UID_TO_PTR(uid)); + may_auto = user && user->display && user->display->seat; + } + } + + if (may_auto) { + r = strv_extend(&l, "/org/freedesktop/login1/seat/auto"); + if (r < 0) + return r; + } + } + } + + *nodes = TAKE_PTR(l); + return 1; +} + +int seat_send_signal(Seat *s, bool new_seat) { + _cleanup_free_ char *p = NULL; + + assert(s); + + p = seat_bus_path(s); + if (!p) + return -ENOMEM; + + return sd_bus_emit_signal( + s->manager->bus, + "/org/freedesktop/login1", + "org.freedesktop.login1.Manager", + new_seat ? "SeatNew" : "SeatRemoved", + "so", s->id, p); +} + +int seat_send_changed(Seat *s, const char *properties, ...) { + _cleanup_free_ char *p = NULL; + char **l; + + assert(s); + + if (!s->started) + return 0; + + p = seat_bus_path(s); + if (!p) + return -ENOMEM; + + l = strv_from_stdarg_alloca(properties); + + return sd_bus_emit_properties_changed_strv(s->manager->bus, p, "org.freedesktop.login1.Seat", l); +} + +static const sd_bus_vtable seat_vtable[] = { + SD_BUS_VTABLE_START(0), + + SD_BUS_PROPERTY("Id", "s", NULL, offsetof(Seat, id), SD_BUS_VTABLE_PROPERTY_CONST), + SD_BUS_PROPERTY("ActiveSession", "(so)", property_get_active_session, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), + SD_BUS_PROPERTY("CanMultiSession", "b", property_get_const_true, 0, SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN), + SD_BUS_PROPERTY("CanTTY", "b", property_get_can_tty, 0, SD_BUS_VTABLE_PROPERTY_CONST), + SD_BUS_PROPERTY("CanGraphical", "b", property_get_can_graphical, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), + SD_BUS_PROPERTY("Sessions", "a(so)", property_get_sessions, 0, 0), + SD_BUS_PROPERTY("IdleHint", "b", property_get_idle_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), + SD_BUS_PROPERTY("IdleSinceHint", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), + SD_BUS_PROPERTY("IdleSinceHintMonotonic", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), + + SD_BUS_METHOD("Terminate", NULL, NULL, bus_seat_method_terminate, SD_BUS_VTABLE_UNPRIVILEGED), + + SD_BUS_METHOD_WITH_ARGS("ActivateSession", + SD_BUS_ARGS("s", session_id), + SD_BUS_NO_RESULT, + method_activate_session, + SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD_WITH_ARGS("SwitchTo", + SD_BUS_ARGS("u", vtnr), + SD_BUS_NO_RESULT, + method_switch_to, + SD_BUS_VTABLE_UNPRIVILEGED), + + SD_BUS_METHOD("SwitchToNext", NULL, NULL, method_switch_to_next, SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD("SwitchToPrevious", NULL, NULL, method_switch_to_previous, SD_BUS_VTABLE_UNPRIVILEGED), + + SD_BUS_VTABLE_END +}; + +const BusObjectImplementation seat_object = { + "/org/freedesktop/login1/seat", + "org.freedesktop.login1.Seat", + .fallback_vtables = BUS_FALLBACK_VTABLES({seat_vtable, seat_object_find}), + .node_enumerator = seat_node_enumerator, +}; |