chiark / gitweb /
bus: decorate the various object vtables with SD_BUS_VTABLE_PROPERTY_CONST where...
[elogind.git] / src / login / logind-dbus.c
index 6471678..7ece815 100644 (file)
@@ -23,6 +23,7 @@
 #include <string.h>
 #include <unistd.h>
 #include <pwd.h>
+#include <sys/capability.h>
 
 #include "sd-id128.h"
 #include "sd-messages.h"
@@ -40,6 +41,8 @@
 #include "bus-util.h"
 #include "bus-error.h"
 #include "logind.h"
+#include "bus-errors.h"
+#include "udev-util.h"
 
 static int property_get_idle_hint(
                 sd_bus *bus,
@@ -47,8 +50,8 @@ static int property_get_idle_hint(
                 const char *interface,
                 const char *property,
                 sd_bus_message *reply,
-                sd_bus_error *error,
-                void *userdata) {
+                void *userdata,
+                sd_bus_error *error) {
 
         Manager *m = userdata;
 
@@ -65,8 +68,8 @@ static int property_get_idle_since_hint(
                 const char *interface,
                 const char *property,
                 sd_bus_message *reply,
-                sd_bus_error *error,
-                void *userdata) {
+                void *userdata,
+                sd_bus_error *error) {
 
         Manager *m = userdata;
         dual_timestamp t;
@@ -86,8 +89,8 @@ static int property_get_inhibited(
                 const char *interface,
                 const char *property,
                 sd_bus_message *reply,
-                sd_bus_error *error,
-                void *userdata) {
+                void *userdata,
+                sd_bus_error *error) {
 
         Manager *m = userdata;
         InhibitWhat w;
@@ -107,8 +110,8 @@ static int property_get_preparing(
                 const char *interface,
                 const char *property,
                 sd_bus_message *reply,
-                sd_bus_error *error,
-                void *userdata) {
+                void *userdata,
+                sd_bus_error *error) {
 
         Manager *m = userdata;
         bool b;
@@ -127,7 +130,7 @@ static int property_get_preparing(
 
 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_handle_action, handle_action, HandleAction);
 
-static int method_get_session(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_get_session(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         _cleanup_free_ char *p = NULL;
         Manager *m = userdata;
         const char *name;
@@ -140,48 +143,62 @@ static int method_get_session(sd_bus *bus, sd_bus_message *message, void *userda
 
         r = sd_bus_message_read(message, "s", &name);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         session = hashmap_get(m->sessions, name);
         if (!session)
-                return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_NO_SUCH_SESSION, "No session '%s' known", name);
+                return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SESSION, "No session '%s' known", name);
 
         p = session_bus_path(session);
         if (!p)
-                return sd_bus_reply_method_errno(bus, message, -ENOMEM, NULL);
+                return -ENOMEM;
 
-        return sd_bus_reply_method_return(bus, message, "o", p);
+        return sd_bus_reply_method_return(message, "o", p);
 }
 
-static int method_get_session_by_pid(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_get_session_by_pid(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         _cleanup_free_ char *p = NULL;
         Session *session = NULL;
         Manager *m = userdata;
-        uint32_t pid;
+        pid_t pid;
         int r;
 
         assert(bus);
         assert(message);
         assert(m);
 
+        assert_cc(sizeof(pid_t) == sizeof(uint32_t));
+
         r = sd_bus_message_read(message, "u", &pid);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
+
+        if (pid == 0) {
+                _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
+
+                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;
+        }
 
         r = manager_get_session_by_pid(m, pid, &session);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
         if (!session)
-                return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_NO_SESSION_FOR_PID, "PID %lu does not belong to any known session", (unsigned long) pid);
+                return sd_bus_error_setf(error, BUS_ERROR_NO_SESSION_FOR_PID, "PID %lu does not belong to any known session", (unsigned long) pid);
 
         p = session_bus_path(session);
         if (!p)
-                return sd_bus_reply_method_errno(bus, message, -ENOMEM, NULL);
+                return -ENOMEM;
 
-        return sd_bus_reply_method_return(bus, message, "o", p);
+        return sd_bus_reply_method_return(message, "o", p);
 }
 
-static int method_get_user(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_get_user(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         _cleanup_free_ char *p = NULL;
         Manager *m = userdata;
         uint32_t uid;
@@ -194,48 +211,62 @@ static int method_get_user(sd_bus *bus, sd_bus_message *message, void *userdata)
 
         r = sd_bus_message_read(message, "u", &uid);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
         if (!user)
-                return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_NO_SUCH_USER, "No user '%lu' known or logged in", (unsigned long) uid);
+                return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_USER, "No user '%lu' known or logged in", (unsigned long) uid);
 
         p = user_bus_path(user);
         if (!p)
-                return sd_bus_reply_method_errno(bus, message, -ENOMEM, NULL);
+                return -ENOMEM;
 
-        return sd_bus_reply_method_return(bus, message, "o", p);
+        return sd_bus_reply_method_return(message, "o", p);
 }
 
-static int method_get_user_by_pid(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_get_user_by_pid(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         _cleanup_free_ char *p = NULL;
         Manager *m = userdata;
         User *user = NULL;
-        uint32_t pid;
+        pid_t pid;
         int r;
 
         assert(bus);
         assert(message);
         assert(m);
 
+        assert_cc(sizeof(pid_t) == sizeof(uint32_t));
+
         r = sd_bus_message_read(message, "u", &pid);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
+
+        if (pid == 0) {
+                _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
+
+                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;
+        }
 
         r = manager_get_user_by_pid(m, pid, &user);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
         if (!user)
-                return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_NO_USER_FOR_PID, "PID %lu does not belong to any known or logged in user", (unsigned long) pid);
+                return sd_bus_error_setf(error, BUS_ERROR_NO_USER_FOR_PID, "PID %lu does not belong to any known or logged in user", (unsigned long) pid);
 
         p = user_bus_path(user);
         if (!p)
-                return sd_bus_reply_method_errno(bus, message, -ENOMEM, NULL);
+                return -ENOMEM;
 
-        return sd_bus_reply_method_return(bus, message, "o", p);
+        return sd_bus_reply_method_return(message, "o", p);
 }
 
-static int method_get_seat(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_get_seat(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         _cleanup_free_ char *p = NULL;
         Manager *m = userdata;
         const char *name;
@@ -248,20 +279,20 @@ static int method_get_seat(sd_bus *bus, sd_bus_message *message, void *userdata)
 
         r = sd_bus_message_read(message, "s", &name);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         seat = hashmap_get(m->seats, name);
         if (!seat)
-                return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_NO_SUCH_SEAT, "No seat '%s' known", name);
+                return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SEAT, "No seat '%s' known", name);
 
         p = seat_bus_path(seat);
         if (!p)
-                return sd_bus_reply_method_errno(bus, message, -ENOMEM, NULL);
+                return -ENOMEM;
 
-        return sd_bus_reply_method_return(bus, message, "o", p);
+        return sd_bus_reply_method_return(message, "o", p);
 }
 
-static int method_list_sessions(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_list_sessions(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
         Manager *m = userdata;
         Session *session;
@@ -272,20 +303,20 @@ static int method_list_sessions(sd_bus *bus, sd_bus_message *message, void *user
         assert(message);
         assert(m);
 
-        r = sd_bus_message_new_method_return(bus, message, &reply);
+        r = sd_bus_message_new_method_return(message, &reply);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         r = sd_bus_message_open_container(reply, 'a', "(susso)");
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         HASHMAP_FOREACH(session, m->sessions, i) {
                 _cleanup_free_ char *p = NULL;
 
                 p = session_bus_path(session);
                 if (!p)
-                        return sd_bus_reply_method_errno(bus, message, -ENOMEM, NULL);
+                        return -ENOMEM;
 
                 r = sd_bus_message_append(reply, "(susso)",
                                           session->id,
@@ -294,17 +325,17 @@ static int method_list_sessions(sd_bus *bus, sd_bus_message *message, void *user
                                           session->seat ? session->seat->id : "",
                                           p);
                 if (r < 0)
-                        return sd_bus_reply_method_errno(bus, message, r, NULL);
+                        return r;
         }
 
         r = sd_bus_message_close_container(reply);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         return sd_bus_send(bus, reply, NULL);
 }
 
-static int method_list_users(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_list_users(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
         Manager *m = userdata;
         User *user;
@@ -315,37 +346,37 @@ static int method_list_users(sd_bus *bus, sd_bus_message *message, void *userdat
         assert(message);
         assert(m);
 
-        r = sd_bus_message_new_method_return(bus, message, &reply);
+        r = sd_bus_message_new_method_return(message, &reply);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         r = sd_bus_message_open_container(reply, 'a', "(uso)");
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         HASHMAP_FOREACH(user, m->users, i) {
                 _cleanup_free_ char *p = NULL;
 
                 p = user_bus_path(user);
                 if (!p)
-                        return sd_bus_reply_method_errno(bus, message, -ENOMEM, NULL);
+                        return -ENOMEM;
 
                 r = sd_bus_message_append(reply, "(uso)",
                                           (uint32_t) user->uid,
                                           user->name,
                                           p);
                 if (r < 0)
-                        return sd_bus_reply_method_errno(bus, message, r, NULL);
+                        return r;
         }
 
         r = sd_bus_message_close_container(reply);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         return sd_bus_send(bus, reply, NULL);
 }
 
-static int method_list_seats(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_list_seats(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
         Manager *m = userdata;
         Seat *seat;
@@ -356,51 +387,51 @@ static int method_list_seats(sd_bus *bus, sd_bus_message *message, void *userdat
         assert(message);
         assert(m);
 
-        r = sd_bus_message_new_method_return(bus, message, &reply);
+        r = sd_bus_message_new_method_return(message, &reply);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         r = sd_bus_message_open_container(reply, 'a', "(so)");
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         HASHMAP_FOREACH(seat, m->seats, i) {
                 _cleanup_free_ char *p = NULL;
 
                 p = seat_bus_path(seat);
                 if (!p)
-                        return sd_bus_reply_method_errno(bus, message, -ENOMEM, NULL);
+                        return -ENOMEM;
 
-                r = sd_bus_message_append(reply, "so", seat->id, p);
+                r = sd_bus_message_append(reply, "(so)", seat->id, p);
                 if (r < 0)
-                        return sd_bus_reply_method_errno(bus, message, r, NULL);
+                        return r;
         }
 
         r = sd_bus_message_close_container(reply);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         return sd_bus_send(bus, reply, NULL);
 }
 
-static int method_list_inhibitors(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_list_inhibitors(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
         Manager *m = userdata;
         Inhibitor *inhibitor;
         Iterator i;
         int r;
 
-        r = sd_bus_message_new_method_return(bus, message, &reply);
+        r = sd_bus_message_new_method_return(message, &reply);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         r = sd_bus_message_open_container(reply, 'a', "(ssssuu)");
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         HASHMAP_FOREACH(inhibitor, m->inhibitors, i) {
 
-                r = sd_bus_message_append(reply, "ssssuu",
+                r = sd_bus_message_append(reply, "(ssssuu)",
                                           strempty(inhibit_what_to_string(inhibitor->what)),
                                           strempty(inhibitor->who),
                                           strempty(inhibitor->why),
@@ -408,17 +439,17 @@ static int method_list_inhibitors(sd_bus *bus, sd_bus_message *message, void *us
                                           (uint32_t) inhibitor->uid,
                                           (uint32_t) inhibitor->pid);
                 if (r < 0)
-                        return sd_bus_reply_method_errno(bus, message, r, NULL);
+                        return r;
         }
 
         r = sd_bus_message_close_container(reply);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         return sd_bus_send(bus, reply, NULL);
 }
 
-static int method_create_session(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_create_session(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         const char *service, *type, *class, *cseat, *tty, *display, *remote_user, *remote_host;
         uint32_t uid, leader, audit_id = 0;
         _cleanup_free_ char *id = NULL;
@@ -438,17 +469,17 @@ static int method_create_session(sd_bus *bus, sd_bus_message *message, void *use
 
         r = sd_bus_message_read(message, "uussssussbss", &uid, &leader, &service, &type, &class, &cseat, &vtnr, &tty, &display, &remote, &remote_user, &remote_host);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         if (leader == 1)
-                return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_INVALID_ARGS, "Invalid leader PID");
+                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid leader PID");
 
         if (isempty(type))
                 t = _SESSION_TYPE_INVALID;
         else {
                 t = session_type_from_string(type);
                 if (t < 0)
-                        return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_INVALID_ARGS, "Invalid session type %s", type);
+                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid session type %s", type);
         }
 
         if (isempty(class))
@@ -456,7 +487,7 @@ static int method_create_session(sd_bus *bus, sd_bus_message *message, void *use
         else {
                 c = session_class_from_string(class);
                 if (c < 0)
-                        return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_INVALID_ARGS, "Invalid session class %s", class);
+                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid session class %s", class);
         }
 
         if (isempty(cseat))
@@ -464,7 +495,7 @@ static int method_create_session(sd_bus *bus, sd_bus_message *message, void *use
         else {
                 seat = hashmap_get(m->seats, cseat);
                 if (!seat)
-                        return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_NO_SUCH_SEAT, "No seat '%s' known", seat);
+                        return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SEAT, "No seat '%s' known", seat);
         }
 
         if (tty_is_vc(tty)) {
@@ -473,41 +504,41 @@ static int method_create_session(sd_bus *bus, sd_bus_message *message, void *use
                 if (!seat)
                         seat = m->seat0;
                 else if (seat != m->seat0)
-                        return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_INVALID_ARGS, "TTY %s is virtual console but seat %s is not seat0", tty, seat);
+                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "TTY %s is virtual console but seat %s is not seat0", tty, seat);
 
                 v = vtnr_from_tty(tty);
                 if (v <= 0)
-                        return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_INVALID_ARGS, "Cannot determine VT number from virtual console TTY %s", tty);
+                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Cannot determine VT number from virtual console TTY %s", tty);
 
-                if (vtnr <= 0)
+                if (!vtnr)
                         vtnr = (uint32_t) v;
                 else if (vtnr != (uint32_t) v)
-                        return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_INVALID_ARGS, "Specified TTY and VT number do not match");
+                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Specified TTY and VT number do not match");
 
         } else if (tty_is_console(tty)) {
 
                 if (!seat)
                         seat = m->seat0;
                 else if (seat != m->seat0)
-                        return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_INVALID_ARGS, "Console TTY specified but seat is not seat0");
+                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Console TTY specified but seat is not seat0");
 
                 if (vtnr != 0)
-                        return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_INVALID_ARGS, "Console TTY specified but VT number is not 0");
+                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Console TTY specified but VT number is not 0");
         }
 
         if (seat) {
                 if (seat_has_vts(seat)) {
-                        if (vtnr > 63)
-                                return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_INVALID_ARGS, "VT number out of range");
+                        if (!vtnr || vtnr > 63)
+                                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "VT number out of range");
                 } else {
                         if (vtnr != 0)
-                                return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_INVALID_ARGS, "Seat has no VTs but VT number not 0");
+                                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Seat has no VTs but VT number not 0");
                 }
         }
 
         r = sd_bus_message_enter_container(message, 'a', "(sv)");
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         if (t == _SESSION_TYPE_INVALID) {
                 if (!isempty(display))
@@ -526,11 +557,17 @@ static int method_create_session(sd_bus *bus, sd_bus_message *message, void *use
         }
 
         if (leader <= 0) {
+                _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
+
+                r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
+                if (r < 0)
+                        return r;
+
                 assert_cc(sizeof(uint32_t) == sizeof(pid_t));
 
-                r = sd_bus_get_owner_pid(bus, sd_bus_message_get_sender(message), (pid_t*) &leader);
+                r = sd_bus_creds_get_pid(creds, (pid_t*) &leader);
                 if (r < 0)
-                        return sd_bus_reply_method_errno(bus, message, r, NULL);
+                        return r;
         }
 
         manager_get_session_by_pid(m, leader, &session);
@@ -544,18 +581,19 @@ static int method_create_session(sd_bus *bus, sd_bus_message *message, void *use
 
                 fifo_fd = session_create_fifo(session);
                 if (fifo_fd < 0)
-                        return sd_bus_reply_method_errno(bus, message, fifo_fd, NULL);
+                        return fifo_fd;
 
                 path = session_bus_path(session);
                 if (!path)
-                        return sd_bus_reply_method_errno(bus, message, -ENOMEM, NULL);
+                        return -ENOMEM;
 
                 return sd_bus_reply_method_return(
-                                bus, message, "soshsub",
+                                message, "soshusub",
                                 session->id,
                                 path,
                                 session->user->runtime_path,
                                 fifo_fd,
+                                (uint32_t) session->user->uid,
                                 session->seat ? session->seat->id : "",
                                 (uint32_t) session->vtnr,
                                 true);
@@ -566,7 +604,7 @@ static int method_create_session(sd_bus *bus, sd_bus_message *message, void *use
                 /* Keep our session IDs and the audit session IDs in sync */
 
                 if (asprintf(&id, "%lu", (unsigned long) audit_id) < 0)
-                        return sd_bus_reply_method_errno(bus, message, -ENOMEM, NULL);
+                        return -ENOMEM;
 
                 /* Wut? There's already a session by this name and we
                  * didn't find it above? Weird, then let's not trust
@@ -587,22 +625,18 @@ static int method_create_session(sd_bus *bus, sd_bus_message *message, void *use
                         id = NULL;
 
                         if (asprintf(&id, "c%lu", ++m->session_counter) < 0)
-                                return sd_bus_reply_method_errno(bus, message, -ENOMEM, NULL);
+                                return -ENOMEM;
 
                 } while (hashmap_get(m->sessions, id));
         }
 
         r = manager_add_user_by_uid(m, uid, &user);
-        if (r < 0) {
-                r = sd_bus_reply_method_errno(bus, message, r, NULL);
+        if (r < 0)
                 goto fail;
-        }
 
         r = manager_add_session(m, id, &session);
-        if (r < 0) {
-                r = sd_bus_reply_method_errno(bus, message, r, NULL);
+        if (r < 0)
                 goto fail;
-        }
 
         session_set_user(session, user);
 
@@ -616,7 +650,7 @@ static int method_create_session(sd_bus *bus, sd_bus_message *message, void *use
         if (!isempty(tty)) {
                 session->tty = strdup(tty);
                 if (!session->tty) {
-                        r = sd_bus_reply_method_errno(bus, message, -ENOMEM, NULL);
+                        r = -ENOMEM;
                         goto fail;
                 }
         }
@@ -624,7 +658,7 @@ static int method_create_session(sd_bus *bus, sd_bus_message *message, void *use
         if (!isempty(display)) {
                 session->display = strdup(display);
                 if (!session->display) {
-                        r = sd_bus_reply_method_errno(bus, message, -ENOMEM, NULL);
+                        r = -ENOMEM;
                         goto fail;
                 }
         }
@@ -632,7 +666,7 @@ static int method_create_session(sd_bus *bus, sd_bus_message *message, void *use
         if (!isempty(remote_user)) {
                 session->remote_user = strdup(remote_user);
                 if (!session->remote_user) {
-                        r = sd_bus_reply_method_errno(bus, message, -ENOMEM, NULL);
+                        r = -ENOMEM;
                         goto fail;
                 }
         }
@@ -640,7 +674,7 @@ static int method_create_session(sd_bus *bus, sd_bus_message *message, void *use
         if (!isempty(remote_host)) {
                 session->remote_host = strdup(remote_host);
                 if (!session->remote_host) {
-                        r = sd_bus_reply_method_errno(bus, message, -ENOMEM, NULL);
+                        r = -ENOMEM;
                         goto fail;
                 }
         }
@@ -648,24 +682,20 @@ static int method_create_session(sd_bus *bus, sd_bus_message *message, void *use
         if (!isempty(service)) {
                 session->service = strdup(service);
                 if (!session->service) {
-                        r = sd_bus_reply_method_errno(bus, message, -ENOMEM, NULL);
+                        r = -ENOMEM;
                         goto fail;
                 }
         }
 
         if (seat) {
                 r = seat_attach_session(seat, session);
-                if (r < 0) {
-                        r = sd_bus_reply_method_errno(bus, message, r, NULL);
+                if (r < 0)
                         goto fail;
-                }
         }
 
         r = session_start(session);
-        if (r < 0) {
-                r = sd_bus_reply_method_errno(bus, message, r, NULL);
+        if (r < 0)
                 goto fail;
-        }
 
         session->create_message = sd_bus_message_ref(message);
 
@@ -685,7 +715,7 @@ fail:
         return r;
 }
 
-static int method_release_session(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_release_session(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
         Session *session;
         const char *name;
@@ -697,11 +727,11 @@ static int method_release_session(sd_bus *bus, sd_bus_message *message, void *us
 
         r = sd_bus_message_read(message, "s", &name);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         session = hashmap_get(m->sessions, name);
         if (!session)
-                return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_NO_SUCH_SESSION, "No session '%s' known", name);
+                return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SESSION, "No session '%s' known", name);
 
         /* We use the FIFO to detect stray sessions where the process
            invoking PAM dies abnormally. We need to make sure that
@@ -713,10 +743,10 @@ static int method_release_session(sd_bus *bus, sd_bus_message *message, void *us
         session_save(session);
         user_save(session->user);
 
-        return sd_bus_reply_method_return(bus, message, NULL);
+        return sd_bus_reply_method_return(message, NULL);
 }
 
-static int method_activate_session(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_activate_session(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
         Session *session;
         const char *name;
@@ -728,20 +758,20 @@ static int method_activate_session(sd_bus *bus, sd_bus_message *message, void *u
 
         r = sd_bus_message_read(message, "s", &name);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         session = hashmap_get(m->sessions, name);
         if (!session)
-                return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_NO_SUCH_SESSION, "No session '%s' known", name);
+                return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SESSION, "No session '%s' known", name);
 
         r = session_activate(session);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
-        return sd_bus_reply_method_return(bus, message, NULL);
+        return sd_bus_reply_method_return(message, NULL);
 }
 
-static int method_activate_session_on_seat(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_activate_session_on_seat(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         const char *session_name, *seat_name;
         Manager *m = userdata;
         Session *session;
@@ -757,27 +787,27 @@ static int method_activate_session_on_seat(sd_bus *bus, sd_bus_message *message,
 
         r = sd_bus_message_read(message, "ss", &session_name, &seat_name);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         session = hashmap_get(m->sessions, session_name);
         if (!session)
-                return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_NO_SUCH_SESSION, "No session '%s' known", session_name);
+                return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SESSION, "No session '%s' known", session_name);
 
         seat = hashmap_get(m->seats, seat_name);
         if (!seat)
-                return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_NO_SUCH_SEAT, "No seat '%s' known", seat_name);
+                return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SEAT, "No seat '%s' known", seat_name);
 
         if (session->seat != seat)
-                return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_SESSION_NOT_ON_SEAT, "Session %s not on seat %s", session_name, seat_name);
+                return sd_bus_error_setf(error, BUS_ERROR_SESSION_NOT_ON_SEAT, "Session %s not on seat %s", session_name, seat_name);
 
         r = session_activate(session);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
-        return sd_bus_reply_method_return(bus, message, NULL);
+        return sd_bus_reply_method_return(message, NULL);
 }
 
-static int method_lock_session(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_lock_session(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
         Session *session;
         const char *name;
@@ -789,20 +819,20 @@ static int method_lock_session(sd_bus *bus, sd_bus_message *message, void *userd
 
         r = sd_bus_message_read(message, "s", &name);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         session = hashmap_get(m->sessions, name);
         if (!session)
-                return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_NO_SUCH_SESSION, "No session '%s' known", name);
+                return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SESSION, "No session '%s' known", name);
 
         r = session_send_lock(session, streq(sd_bus_message_get_member(message), "LockSession"));
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
-        return sd_bus_reply_method_return(bus, message, NULL);
+        return sd_bus_reply_method_return(message, NULL);
 }
 
-static int method_lock_sessions(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_lock_sessions(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
         int r;
 
@@ -812,12 +842,12 @@ static int method_lock_sessions(sd_bus *bus, sd_bus_message *message, void *user
 
         r = session_send_lock_all(m, streq(sd_bus_message_get_member(message), "LockSessions"));
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
-        return sd_bus_reply_method_return(bus, message, NULL);
+        return sd_bus_reply_method_return(message, NULL);
 }
 
-static int method_kill_session(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_kill_session(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         const char *name, *swho;
         Manager *m = userdata;
         Session *session;
@@ -831,31 +861,31 @@ static int method_kill_session(sd_bus *bus, sd_bus_message *message, void *userd
 
         r = sd_bus_message_read(message, "ssi", &name, &swho, &signo);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         if (isempty(swho))
                 who = KILL_ALL;
         else {
                 who = kill_who_from_string(swho);
                 if (who < 0)
-                        return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_INVALID_ARGS, "Invalid kill parameter '%s'", swho);
+                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid kill parameter '%s'", swho);
         }
 
         if (signo <= 0 || signo >= _NSIG)
-                return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo);
+                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo);
 
         session = hashmap_get(m->sessions, name);
         if (!session)
-                return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_NO_SUCH_SESSION, "No session '%s' known", name);
+                return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SESSION, "No session '%s' known", name);
 
         r = session_kill(session, who, signo);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
-        return sd_bus_reply_method_return(bus, message, NULL);
+        return sd_bus_reply_method_return(message, NULL);
 }
 
-static int method_kill_user(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_kill_user(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
         uint32_t uid;
         int32_t signo;
@@ -868,23 +898,23 @@ static int method_kill_user(sd_bus *bus, sd_bus_message *message, void *userdata
 
         r = sd_bus_message_read(message, "ui", &uid, &signo);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         if (signo <= 0 || signo >= _NSIG)
-                return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo);
+                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo);
 
         user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
         if (!user)
-                return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_NO_SUCH_USER, "No user '%lu' known or logged in", (unsigned long) uid);
+                return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_USER, "No user '%lu' known or logged in", (unsigned long) uid);
 
         r = user_kill(user, signo);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
-        return sd_bus_reply_method_return(bus, message, NULL);
+        return sd_bus_reply_method_return(message, NULL);
 }
 
-static int method_terminate_session(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_terminate_session(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
         const char *name;
         Session *session;
@@ -896,20 +926,20 @@ static int method_terminate_session(sd_bus *bus, sd_bus_message *message, void *
 
         r = sd_bus_message_read(message, "s", &name);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         session = hashmap_get(m->sessions, name);
         if (!session)
-                return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_NO_SUCH_SESSION, "No session '%s' known", name);
+                return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SESSION, "No session '%s' known", name);
 
         r = session_stop(session);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
-        return sd_bus_reply_method_return(bus, message, NULL);
+        return sd_bus_reply_method_return(message, NULL);
 }
 
-static int method_terminate_user(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_terminate_user(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
         uint32_t uid;
         User *user;
@@ -921,20 +951,20 @@ static int method_terminate_user(sd_bus *bus, sd_bus_message *message, void *use
 
         r = sd_bus_message_read(message, "u", &uid);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
         if (!user)
-                return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_NO_SUCH_USER, "No user '%lu' known or logged in", (unsigned long) uid);
+                return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_USER, "No user '%lu' known or logged in", (unsigned long) uid);
 
         r = user_stop(user);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
-        return sd_bus_reply_method_return(bus, message, NULL);
+        return sd_bus_reply_method_return(message, NULL);
 }
 
-static int method_terminate_seat(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_terminate_seat(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
         const char *name;
         Seat *seat;
@@ -946,21 +976,20 @@ static int method_terminate_seat(sd_bus *bus, sd_bus_message *message, void *use
 
         r = sd_bus_message_read(message, "s", &name);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         seat = hashmap_get(m->seats, name);
         if (!seat)
-                return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_NO_SUCH_SEAT, "No seat '%s' known", name);
+                return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SEAT, "No seat '%s' known", name);
 
         r = seat_stop_sessions(seat);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
-        return sd_bus_reply_method_return(bus, message, NULL);
+        return sd_bus_reply_method_return(message, NULL);
 }
 
-static int method_set_user_linger(sd_bus *bus, sd_bus_message *message, void *userdata) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+static int method_set_user_linger(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         _cleanup_free_ char *cc = NULL;
         Manager *m = userdata;
         int b, r;
@@ -975,22 +1004,22 @@ static int method_set_user_linger(sd_bus *bus, sd_bus_message *message, void *us
 
         r = sd_bus_message_read(message, "ubb", &uid, &b, &interactive);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         errno = 0;
         pw = getpwuid(uid);
         if (!pw)
-                return sd_bus_reply_method_errno(bus, message, errno ? errno : ENOENT, NULL);
+                return errno ? -errno : -ENOENT;
 
         r = bus_verify_polkit_async(bus,
                                     &m->polkit_registry,
                                     message,
                                     "org.freedesktop.login1.set-user-linger",
                                     interactive,
-                                    &error,
+                                    error,
                                     method_set_user_linger, m);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, &error);
+                return r;
         if (r == 0)
                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 
@@ -998,11 +1027,11 @@ static int method_set_user_linger(sd_bus *bus, sd_bus_message *message, void *us
 
         r = mkdir_safe_label("/var/lib/systemd/linger", 0755, 0, 0);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         cc = cescape(pw->pw_name);
         if (!cc)
-                return sd_bus_reply_method_errno(bus, message, ENOMEM, NULL);
+                return -ENOMEM;
 
         path = strappenda("/var/lib/systemd/linger/", cc);
         if (b) {
@@ -1010,7 +1039,7 @@ static int method_set_user_linger(sd_bus *bus, sd_bus_message *message, void *us
 
                 r = touch(path);
                 if (r < 0)
-                        return sd_bus_reply_method_errno(bus, message, r, NULL);
+                        return r;
 
                 if (manager_add_user_by_uid(m, uid, &u) >= 0)
                         user_start(u);
@@ -1020,40 +1049,36 @@ static int method_set_user_linger(sd_bus *bus, sd_bus_message *message, void *us
 
                 r = unlink(path);
                 if (r < 0 && errno != ENOENT)
-                        return sd_bus_reply_method_errno(bus, message, errno, NULL);
+                        return -errno;
 
                 u = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
                 if (u)
                         user_add_to_gc_queue(u);
         }
 
-        return sd_bus_reply_method_return(bus, message, NULL);
+        return sd_bus_reply_method_return(message, NULL);
 }
 
 static int trigger_device(Manager *m, struct udev_device *d) {
-        struct udev_enumerate *e;
+        _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
         struct udev_list_entry *first, *item;
         int r;
 
         assert(m);
 
         e = udev_enumerate_new(m->udev);
-        if (!e) {
-                r = -ENOMEM;
-                goto finish;
-        }
+        if (!e)
+                return -ENOMEM;
 
         if (d) {
-                if (udev_enumerate_add_match_parent(e, d) < 0) {
-                        r = -EIO;
-                        goto finish;
-                }
+                r = udev_enumerate_add_match_parent(e, d);
+                if (r < 0)
+                        return r;
         }
 
-        if (udev_enumerate_scan_devices(e) < 0) {
-                r = -EIO;
-                goto finish;
-        }
+        r = udev_enumerate_scan_devices(e);
+        if (r < 0)
+                return r;
 
         first = udev_enumerate_get_list_entry(e);
         udev_list_entry_foreach(item, first) {
@@ -1063,27 +1088,19 @@ static int trigger_device(Manager *m, struct udev_device *d) {
                 p = udev_list_entry_get_name(item);
 
                 t = strappend(p, "/uevent");
-                if (!t) {
-                        r = -ENOMEM;
-                        goto finish;
-                }
+                if (!t)
+                        return -ENOMEM;
 
                 write_string_file(t, "change");
         }
 
-        r = 0;
-
-finish:
-        if (e)
-                udev_enumerate_unref(e);
-
-        return r;
+        return 0;
 }
 
 static int attach_device(Manager *m, const char *seat, const char *sysfs) {
+        _cleanup_udev_device_unref_ struct udev_device *d = NULL;
         _cleanup_free_ char *rule = NULL, *file = NULL;
         const char *id_for_seat;
-        struct udev_device *d;
         int r;
 
         assert(m);
@@ -1094,40 +1111,26 @@ static int attach_device(Manager *m, const char *seat, const char *sysfs) {
         if (!d)
                 return -ENODEV;
 
-        if (!udev_device_has_tag(d, "seat")) {
-                r = -ENODEV;
-                goto finish;
-        }
+        if (!udev_device_has_tag(d, "seat"))
+                return -ENODEV;
 
         id_for_seat = udev_device_get_property_value(d, "ID_FOR_SEAT");
-        if (!id_for_seat) {
-                r = -ENODEV;
-                goto finish;
-        }
+        if (!id_for_seat)
+                return -ENODEV;
 
-        if (asprintf(&file, "/etc/udev/rules.d/72-seat-%s.rules", id_for_seat) < 0) {
-                r = -ENOMEM;
-                goto finish;
-        }
+        if (asprintf(&file, "/etc/udev/rules.d/72-seat-%s.rules", id_for_seat) < 0)
+                return -ENOMEM;
 
-        if (asprintf(&rule, "TAG==\"seat\", ENV{ID_FOR_SEAT}==\"%s\", ENV{ID_SEAT}=\"%s\"", id_for_seat, seat) < 0) {
-                r = -ENOMEM;
-                goto finish;
-        }
+        if (asprintf(&rule, "TAG==\"seat\", ENV{ID_FOR_SEAT}==\"%s\", ENV{ID_SEAT}=\"%s\"", id_for_seat, seat) < 0)
+                return -ENOMEM;
 
         mkdir_p_label("/etc/udev/rules.d", 0755);
         label_init("/etc");
         r = write_string_file_atomic_label(file, rule);
         if (r < 0)
-                goto finish;
-
-        r = trigger_device(m, d);
-
-finish:
-        if (d)
-                udev_device_unref(d);
+                return r;
 
-        return r;
+        return trigger_device(m, d);
 }
 
 static int flush_devices(Manager *m) {
@@ -1161,8 +1164,7 @@ static int flush_devices(Manager *m) {
         return trigger_device(m, NULL);
 }
 
-static int method_attach_device(sd_bus *bus, sd_bus_message *message, void *userdata) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+static int method_attach_device(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         const char *sysfs, *seat;
         Manager *m = userdata;
         int interactive, r;
@@ -1173,35 +1175,34 @@ static int method_attach_device(sd_bus *bus, sd_bus_message *message, void *user
 
         r = sd_bus_message_read(message, "ssb", &seat, &sysfs, &interactive);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         if (!path_startswith(sysfs, "/sys"))
-                return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_INVALID_ARGS, "Path %s is not in /sys", sysfs);
+                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Path %s is not in /sys", sysfs);
 
         if (!seat_name_is_valid(seat))
-                return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_INVALID_ARGS, "Seat %s is not valid", seat);
+                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Seat %s is not valid", seat);
 
         r = bus_verify_polkit_async(bus,
                                     &m->polkit_registry,
                                     message,
                                     "org.freedesktop.login1.attach-device",
                                     interactive,
-                                    &error,
+                                    error,
                                     method_attach_device, m);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, &error);
+                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 = attach_device(m, seat, sysfs);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
-        return sd_bus_reply_method_return(bus, message, NULL);
+        return sd_bus_reply_method_return(message, NULL);
 }
 
-static int method_flush_devices(sd_bus *bus, sd_bus_message *message, void *userdata) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+static int method_flush_devices(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
         int interactive, r;
 
@@ -1211,25 +1212,25 @@ static int method_flush_devices(sd_bus *bus, sd_bus_message *message, void *user
 
         r = sd_bus_message_read(message, "b", &interactive);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         r = bus_verify_polkit_async(bus,
                                     &m->polkit_registry,
                                     message,
                                     "org.freedesktop.login1.flush-devices",
                                     interactive,
-                                    &error,
+                                    error,
                                     method_flush_devices, m);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, &error);
+                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 = flush_devices(m);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, &error);
+                return r;
 
-        return sd_bus_reply_method_return(bus, message, NULL);
+        return sd_bus_reply_method_return(message, NULL);
 }
 
 static int have_multiple_sessions(
@@ -1245,7 +1246,6 @@ static int have_multiple_sessions(
          * count, and non-login sessions do not count either. */
         HASHMAP_FOREACH(session, m->sessions, i)
                 if (session->class == SESSION_USER &&
-                    !session->closing &&
                     session->user->uid != uid)
                         return true;
 
@@ -1369,7 +1369,7 @@ static int send_prepare_for(Manager *m, InhibitWhat w, bool _active) {
                                   "org.freedesktop.login1.Manager",
                                   signal_name[w],
                                   "b",
-                                  &active);
+                                  active);
 }
 
 int bus_manager_shutdown_or_sleep_now_or_later(
@@ -1392,7 +1392,7 @@ int bus_manager_shutdown_or_sleep_now_or_later(
 
         delayed =
                 m->inhibit_delay_max > 0 &&
-                manager_is_inhibited(m, w, INHIBIT_DELAY, NULL, false, false, 0);
+                manager_is_inhibited(m, w, INHIBIT_DELAY, NULL, false, false, 0, NULL);
 
         if (delayed)
                 /* Shutdown is delayed, keep in mind what we
@@ -1415,9 +1415,10 @@ static int method_do_shutdown_or_sleep(
                 const char *action_multiple_sessions,
                 const char *action_ignore_inhibit,
                 const char *sleep_verb,
-                sd_bus_message_handler_t method) {
+                sd_bus_message_handler_t method,
+                sd_bus_error *error) {
 
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
         bool multiple_sessions, blocked;
         int interactive, r;
         uid_t uid;
@@ -1434,61 +1435,65 @@ static int method_do_shutdown_or_sleep(
 
         r = sd_bus_message_read(message, "b", &interactive);
         if (r < 0)
-                return sd_bus_reply_method_errno(m->bus, message, r, NULL);
+                return r;
 
         /* Don't allow multiple jobs being executed at the same time */
         if (m->action_what)
-                return sd_bus_reply_method_errorf(m->bus, message, BUS_ERROR_OPERATION_IN_PROGRESS, "There's already a shutdown or sleep operation in progress");
+                return sd_bus_error_setf(error, BUS_ERROR_OPERATION_IN_PROGRESS, "There's already a shutdown or sleep operation in progress");
 
         if (sleep_verb) {
                 r = can_sleep(sleep_verb);
                 if (r < 0)
-                        return sd_bus_reply_method_errno(m->bus, message, r, NULL);
+                        return r;
 
                 if (r == 0)
-                        return sd_bus_reply_method_errorf(m->bus, message, BUS_ERROR_SLEEP_VERB_NOT_SUPPORTED, "Sleep verb not supported");
+                        return sd_bus_error_setf(error, BUS_ERROR_SLEEP_VERB_NOT_SUPPORTED, "Sleep verb not supported");
         }
 
-        r = sd_bus_get_owner_uid(m->bus, sd_bus_message_get_sender(message), &uid);
+        r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_UID, &creds);
         if (r < 0)
-                return sd_bus_reply_method_errno(m->bus, message, r, NULL);
+                return r;
+
+        r = sd_bus_creds_get_uid(creds, &uid);
+        if (r < 0)
+                return r;
 
         r = have_multiple_sessions(m, uid);
         if (r < 0)
-                return sd_bus_reply_method_errno(m->bus, message, r, NULL);
+                return r;
 
         multiple_sessions = r > 0;
-        blocked = manager_is_inhibited(m, w, INHIBIT_BLOCK, NULL, false, true, uid);
+        blocked = manager_is_inhibited(m, w, INHIBIT_BLOCK, NULL, false, true, uid, NULL);
 
         if (multiple_sessions) {
                 r = bus_verify_polkit_async(m->bus, &m->polkit_registry, message,
-                                            action_multiple_sessions, interactive, &error, method, m);
+                                            action_multiple_sessions, interactive, error, method, m);
                 if (r < 0)
-                        return sd_bus_reply_method_errno(m->bus, message, r, &error);
+                        return r;
         }
 
         if (blocked) {
                 r = bus_verify_polkit_async(m->bus, &m->polkit_registry, message,
-                                            action_ignore_inhibit, interactive, &error, method, m);
+                                            action_ignore_inhibit, interactive, error, method, m);
                 if (r < 0)
-                        return sd_bus_reply_method_errno(m->bus, message, r, &error);
+                        return r;
         }
 
         if (!multiple_sessions && !blocked) {
                 r = bus_verify_polkit_async(m->bus, &m->polkit_registry, message,
-                                            action, interactive, &error, method, m);
+                                            action, interactive, error, method, m);
                 if (r < 0)
-                        return sd_bus_reply_method_errno(m->bus, message, r, &error);
+                        return r;
         }
 
-        r = bus_manager_shutdown_or_sleep_now_or_later(m, unit_name, w, &error);
+        r = bus_manager_shutdown_or_sleep_now_or_later(m, unit_name, w, error);
         if (r < 0)
-                return sd_bus_reply_method_errno(m->bus, message, r, &error);
+                return r;
 
-        return sd_bus_reply_method_return(m->bus, message, NULL);
+        return sd_bus_reply_method_return(message, NULL);
 }
 
-static int method_poweroff(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_poweroff(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
 
         return method_do_shutdown_or_sleep(
@@ -1499,10 +1504,11 @@ static int method_poweroff(sd_bus *bus, sd_bus_message *message, void *userdata)
                         "org.freedesktop.login1.power-off-multiple-sessions",
                         "org.freedesktop.login1.power-off-ignore-inhibit",
                         NULL,
-                        method_poweroff);
+                        method_poweroff,
+                        error);
 }
 
-static int method_reboot(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_reboot(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
 
         return method_do_shutdown_or_sleep(
@@ -1513,10 +1519,11 @@ static int method_reboot(sd_bus *bus, sd_bus_message *message, void *userdata) {
                         "org.freedesktop.login1.reboot-multiple-sessions",
                         "org.freedesktop.login1.reboot-ignore-inhibit",
                         NULL,
-                        method_reboot);
+                        method_reboot,
+                        error);
 }
 
-static int method_suspend(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_suspend(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
 
         return method_do_shutdown_or_sleep(
@@ -1527,10 +1534,11 @@ static int method_suspend(sd_bus *bus, sd_bus_message *message, void *userdata)
                         "org.freedesktop.login1.suspend-multiple-sessions",
                         "org.freedesktop.login1.suspend-ignore-inhibit",
                         "suspend",
-                        method_suspend);
+                        method_suspend,
+                        error);
 }
 
-static int method_hibernate(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_hibernate(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
 
         return method_do_shutdown_or_sleep(
@@ -1541,10 +1549,11 @@ static int method_hibernate(sd_bus *bus, sd_bus_message *message, void *userdata
                         "org.freedesktop.login1.hibernate-multiple-sessions",
                         "org.freedesktop.login1.hibernate-ignore-inhibit",
                         "hibernate",
-                        method_hibernate);
+                        method_hibernate,
+                        error);
 }
 
-static int method_hybrid_sleep(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_hybrid_sleep(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
 
         return method_do_shutdown_or_sleep(
@@ -1555,7 +1564,8 @@ static int method_hybrid_sleep(sd_bus *bus, sd_bus_message *message, void *userd
                         "org.freedesktop.login1.hibernate-multiple-sessions",
                         "org.freedesktop.login1.hibernate-ignore-inhibit",
                         "hybrid-sleep",
-                        method_hybrid_sleep);
+                        method_hybrid_sleep,
+                        error);
 }
 
 static int method_can_shutdown_or_sleep(
@@ -1565,9 +1575,10 @@ static int method_can_shutdown_or_sleep(
                 const char *action,
                 const char *action_multiple_sessions,
                 const char *action_ignore_inhibit,
-                const char *sleep_verb) {
+                const char *sleep_verb,
+                sd_bus_error *error) {
 
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
         bool multiple_sessions, challenge, blocked;
         const char *result = NULL;
         uid_t uid;
@@ -1584,26 +1595,30 @@ static int method_can_shutdown_or_sleep(
         if (sleep_verb) {
                 r = can_sleep(sleep_verb);
                 if (r < 0)
-                        return sd_bus_reply_method_errno(m->bus, message, r, NULL);
+                        return r;
                 if (r == 0)
-                        return sd_bus_reply_method_return(m->bus, message, "s", "na");
+                        return sd_bus_reply_method_return(message, "s", "na");
         }
 
-        r = sd_bus_get_owner_uid(m->bus, sd_bus_message_get_sender(message), &uid);
+        r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_UID, &creds);
         if (r < 0)
-                return sd_bus_reply_method_errno(m->bus, message, r, NULL);
+                return r;
+
+        r = sd_bus_creds_get_uid(creds, &uid);
+        if (r < 0)
+                return r;
 
         r = have_multiple_sessions(m, uid);
         if (r < 0)
-                return sd_bus_reply_method_errno(m->bus, message, r, NULL);
+                return r;
 
         multiple_sessions = r > 0;
-        blocked = manager_is_inhibited(m, w, INHIBIT_BLOCK, NULL, false, true, uid);
+        blocked = manager_is_inhibited(m, w, INHIBIT_BLOCK, NULL, false, true, uid, NULL);
 
         if (multiple_sessions) {
-                r = bus_verify_polkit(m->bus, message, action_multiple_sessions, false, &challenge, &error);
+                r = bus_verify_polkit(m->bus, message, action_multiple_sessions, false, &challenge, error);
                 if (r < 0)
-                        return sd_bus_reply_method_errno(m->bus, message, r, &error);
+                        return r;
 
                 if (r > 0)
                         result = "yes";
@@ -1614,9 +1629,9 @@ static int method_can_shutdown_or_sleep(
         }
 
         if (blocked) {
-                r = bus_verify_polkit(m->bus, message, action_ignore_inhibit, false, &challenge, &error);
+                r = bus_verify_polkit(m->bus, message, action_ignore_inhibit, false, &challenge, error);
                 if (r < 0)
-                        return sd_bus_reply_method_errno(m->bus, message, r, &error);
+                        return r;
 
                 if (r > 0 && !result)
                         result = "yes";
@@ -1630,9 +1645,9 @@ static int method_can_shutdown_or_sleep(
                 /* If neither inhibit nor multiple sessions
                  * apply then just check the normal policy */
 
-                r = bus_verify_polkit(m->bus, message, action, false, &challenge, &error);
+                r = bus_verify_polkit(m->bus, message, action, false, &challenge, error);
                 if (r < 0)
-                        return sd_bus_reply_method_errno(m->bus, message, r, &error);
+                        return r;
 
                 if (r > 0)
                         result = "yes";
@@ -1642,10 +1657,10 @@ static int method_can_shutdown_or_sleep(
                         result = "no";
         }
 
-        return sd_bus_reply_method_return(m->bus, message, "s", result);
+        return sd_bus_reply_method_return(message, "s", result);
 }
 
-static int method_can_poweroff(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_can_poweroff(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
 
         return method_can_shutdown_or_sleep(
@@ -1654,10 +1669,11 @@ static int method_can_poweroff(sd_bus *bus, sd_bus_message *message, void *userd
                         "org.freedesktop.login1.power-off",
                         "org.freedesktop.login1.power-off-multiple-sessions",
                         "org.freedesktop.login1.power-off-ignore-inhibit",
-                        NULL);
+                        NULL,
+                        error);
 }
 
-static int method_can_reboot(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_can_reboot(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
 
         return method_can_shutdown_or_sleep(
@@ -1666,10 +1682,11 @@ static int method_can_reboot(sd_bus *bus, sd_bus_message *message, void *userdat
                         "org.freedesktop.login1.reboot",
                         "org.freedesktop.login1.reboot-multiple-sessions",
                         "org.freedesktop.login1.reboot-ignore-inhibit",
-                        NULL);
+                        NULL,
+                        error);
 }
 
-static int method_can_suspend(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_can_suspend(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
 
         return method_can_shutdown_or_sleep(
@@ -1678,10 +1695,11 @@ static int method_can_suspend(sd_bus *bus, sd_bus_message *message, void *userda
                         "org.freedesktop.login1.suspend",
                         "org.freedesktop.login1.suspend-multiple-sessions",
                         "org.freedesktop.login1.suspend-ignore-inhibit",
-                        "suspend");
+                        "suspend",
+                        error);
 }
 
-static int method_can_hibernate(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_can_hibernate(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
 
         return method_can_shutdown_or_sleep(
@@ -1690,10 +1708,11 @@ static int method_can_hibernate(sd_bus *bus, sd_bus_message *message, void *user
                         "org.freedesktop.login1.hibernate",
                         "org.freedesktop.login1.hibernate-multiple-sessions",
                         "org.freedesktop.login1.hibernate-ignore-inhibit",
-                        "hibernate");
+                        "hibernate",
+                        error);
 }
 
-static int method_can_hybrid_sleep(sd_bus *bus, sd_bus_message *message, void *userdata) {
+static int method_can_hybrid_sleep(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
 
         return method_can_shutdown_or_sleep(
@@ -1702,11 +1721,12 @@ static int method_can_hybrid_sleep(sd_bus *bus, sd_bus_message *message, void *u
                         "org.freedesktop.login1.hibernate",
                         "org.freedesktop.login1.hibernate-multiple-sessions",
                         "org.freedesktop.login1.hibernate-ignore-inhibit",
-                        "hybrid-sleep");
+                        "hybrid-sleep",
+                        error);
 }
 
-static int method_inhibit(sd_bus *bus, sd_bus_message *message, void *userdata) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+static int method_inhibit(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
         const char *who, *why, *what, *mode;
         _cleanup_free_ char *id = NULL;
         _cleanup_close_ int fifo_fd = -1;
@@ -1724,26 +1744,26 @@ static int method_inhibit(sd_bus *bus, sd_bus_message *message, void *userdata)
 
         r = sd_bus_message_read(message, "ssss", &what, &who, &why, &mode);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         w = inhibit_what_from_string(what);
         if (w <= 0)
-                return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_INVALID_ARGS, "Invalid what specification %s", what);
+                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid what specification %s", what);
 
         mm = inhibit_mode_from_string(mode);
         if (mm < 0)
-                return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_INVALID_ARGS, "Invalid mode specification %s", mode);
+                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid mode specification %s", mode);
 
         /* Delay is only supported for shutdown/sleep */
         if (mm == INHIBIT_DELAY && (w & ~(INHIBIT_SHUTDOWN|INHIBIT_SLEEP)))
-                return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_INVALID_ARGS, "Delay inhibitors only supported for shutdown and sleep");
+                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Delay inhibitors only supported for shutdown and sleep");
 
         /* Don't allow taking delay locks while we are already
          * executing the operation. We shouldn't create the impression
          * that the lock was successful if the machine is about to go
          * down/suspend any moment. */
         if (m->action_what & w)
-                return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_OPERATION_IN_PROGRESS, "The operation inhibition has been requested for is already running");
+                return sd_bus_error_setf(error, BUS_ERROR_OPERATION_IN_PROGRESS, "The operation inhibition has been requested for is already running");
 
         r = bus_verify_polkit_async(bus, &m->polkit_registry, message,
                                     w == INHIBIT_SHUTDOWN             ? (mm == INHIBIT_BLOCK ? "org.freedesktop.login1.inhibit-block-shutdown" : "org.freedesktop.login1.inhibit-delay-shutdown") :
@@ -1753,32 +1773,36 @@ static int method_inhibit(sd_bus *bus, sd_bus_message *message, void *userdata)
                                     w == INHIBIT_HANDLE_SUSPEND_KEY   ? "org.freedesktop.login1.inhibit-handle-suspend-key" :
                                     w == INHIBIT_HANDLE_HIBERNATE_KEY ? "org.freedesktop.login1.inhibit-handle-hibernate-key" :
                                                                         "org.freedesktop.login1.inhibit-handle-lid-switch",
-                                    false, &error, method_inhibit, m);
+                                    false, error, method_inhibit, m);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, &error);
+                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 = sd_bus_get_owner_uid(m->bus, sd_bus_message_get_sender(message), &uid);
+        r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_UID|SD_BUS_CREDS_PID, &creds);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
-        r = sd_bus_get_owner_pid(m->bus, sd_bus_message_get_sender(message), &pid);
+        r = sd_bus_creds_get_uid(creds, &uid);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
+
+        r = sd_bus_creds_get_pid(creds, &pid);
+        if (r < 0)
+                return r;
 
         do {
                 free(id);
                 id = NULL;
 
                 if (asprintf(&id, "%lu", ++m->inhibit_counter) < 0)
-                        return sd_bus_reply_method_errno(bus, message, -ENOMEM, NULL);
+                        return -ENOMEM;
 
         } while (hashmap_get(m->inhibitors, id));
 
         r = manager_add_inhibitor(m, id, &i);
         if (r < 0)
-                return sd_bus_reply_method_errno(bus, message, r, NULL);
+                return r;
 
         i->what = w;
         i->mode = mm;
@@ -1788,19 +1812,19 @@ static int method_inhibit(sd_bus *bus, sd_bus_message *message, void *userdata)
         i->who = strdup(who);
 
         if (!i->why || !i->who) {
-                r = sd_bus_reply_method_errno(bus, message, -ENOMEM, NULL);
+                r = -ENOMEM;
                 goto fail;
         }
 
         fifo_fd = inhibitor_create_fifo(i);
         if (fifo_fd < 0) {
-                r = sd_bus_reply_method_errno(bus, message, fifo_fd, NULL);
+                r = fifo_fd;
                 goto fail;
         }
 
         inhibitor_start(i);
 
-        return sd_bus_reply_method_return(bus, message, "h", fifo_fd);
+        return sd_bus_reply_method_return(message, "h", fifo_fd);
 
 fail:
         if (i)
@@ -1812,61 +1836,61 @@ fail:
 const sd_bus_vtable manager_vtable[] = {
         SD_BUS_VTABLE_START(0),
 
-        SD_BUS_PROPERTY("NAutoVTs", "u", NULL, offsetof(Manager, n_autovts), 0),
-        SD_BUS_PROPERTY("KillOnlyUsers", "as", NULL, offsetof(Manager, kill_only_users), 0),
-        SD_BUS_PROPERTY("KillExcludeUsers", "as", NULL, offsetof(Manager, kill_exclude_users), 0),
-        SD_BUS_PROPERTY("KillUserProcesses", "b", NULL, offsetof(Manager, kill_user_processes), 0),
+        SD_BUS_PROPERTY("NAutoVTs", "u", NULL, offsetof(Manager, n_autovts), SD_BUS_VTABLE_PROPERTY_CONST),
+        SD_BUS_PROPERTY("KillOnlyUsers", "as", NULL, offsetof(Manager, kill_only_users), SD_BUS_VTABLE_PROPERTY_CONST),
+        SD_BUS_PROPERTY("KillExcludeUsers", "as", NULL, offsetof(Manager, kill_exclude_users), SD_BUS_VTABLE_PROPERTY_CONST),
+        SD_BUS_PROPERTY("KillUserProcesses", "b", NULL, offsetof(Manager, kill_user_processes), SD_BUS_VTABLE_PROPERTY_CONST),
         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_PROPERTY("BlockInhibited", "s", property_get_inhibited, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
         SD_BUS_PROPERTY("DelayInhibited", "s", property_get_inhibited, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
-        SD_BUS_PROPERTY("InhibitDelayMaxUSec", "t", NULL, offsetof(Manager, inhibit_delay_max), 0),
-        SD_BUS_PROPERTY("HandlePowerKey", "s", property_get_handle_action, offsetof(Manager, handle_power_key), 0),
-        SD_BUS_PROPERTY("HandleSuspendKey", "s", property_get_handle_action, offsetof(Manager, handle_suspend_key), 0),
-        SD_BUS_PROPERTY("HandleHibernateKey", "s", property_get_handle_action, offsetof(Manager, handle_hibernate_key), 0),
-        SD_BUS_PROPERTY("HandleLidSwitch", "s", property_get_handle_action, offsetof(Manager, handle_lid_switch), 0),
-        SD_BUS_PROPERTY("IdleAction", "s", property_get_handle_action, offsetof(Manager, idle_action), 0),
-        SD_BUS_PROPERTY("IdleActionUSec", "t", NULL, offsetof(Manager, idle_action_usec), 0),
+        SD_BUS_PROPERTY("InhibitDelayMaxUSec", "t", NULL, offsetof(Manager, inhibit_delay_max), SD_BUS_VTABLE_PROPERTY_CONST),
+        SD_BUS_PROPERTY("HandlePowerKey", "s", property_get_handle_action, offsetof(Manager, handle_power_key), SD_BUS_VTABLE_PROPERTY_CONST),
+        SD_BUS_PROPERTY("HandleSuspendKey", "s", property_get_handle_action, offsetof(Manager, handle_suspend_key), SD_BUS_VTABLE_PROPERTY_CONST),
+        SD_BUS_PROPERTY("HandleHibernateKey", "s", property_get_handle_action, offsetof(Manager, handle_hibernate_key), SD_BUS_VTABLE_PROPERTY_CONST),
+        SD_BUS_PROPERTY("HandleLidSwitch", "s", property_get_handle_action, offsetof(Manager, handle_lid_switch), SD_BUS_VTABLE_PROPERTY_CONST),
+        SD_BUS_PROPERTY("IdleAction", "s", property_get_handle_action, offsetof(Manager, idle_action), SD_BUS_VTABLE_PROPERTY_CONST),
+        SD_BUS_PROPERTY("IdleActionUSec", "t", NULL, offsetof(Manager, idle_action_usec), SD_BUS_VTABLE_PROPERTY_CONST),
         SD_BUS_PROPERTY("PreparingForShutdown", "b", property_get_preparing, 0, 0),
         SD_BUS_PROPERTY("PreparingForSleep", "b", property_get_preparing, 0, 0),
 
-        SD_BUS_METHOD("GetSession", "s", "o", method_get_session, 0),
-        SD_BUS_METHOD("GetSessionByPID", "u", "o", method_get_session_by_pid, 0),
-        SD_BUS_METHOD("GetUser", "u", "o", method_get_user, 0),
-        SD_BUS_METHOD("GetUserByPID", "u", "o", method_get_user_by_pid, 0),
-        SD_BUS_METHOD("GetSeat", "s", "o", method_get_seat, 0),
-        SD_BUS_METHOD("ListSessions", NULL, "a(susso)", method_list_sessions, 0),
-        SD_BUS_METHOD("ListUsers", NULL, "a(uso)", method_list_users, 0),
-        SD_BUS_METHOD("ListSeats", NULL, "a(so)", method_list_seats, 0),
-        SD_BUS_METHOD("ListInhibitors", NULL, "a(ssssuu)", method_list_inhibitors, 0),
-        SD_BUS_METHOD("CreateSession", "uussssussbssa(sv)", "soshsub", method_create_session, 0),
+        SD_BUS_METHOD("GetSession", "s", "o", method_get_session, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("GetSessionByPID", "u", "o", method_get_session_by_pid, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("GetUser", "u", "o", method_get_user, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("GetUserByPID", "u", "o", method_get_user_by_pid, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("GetSeat", "s", "o", method_get_seat, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("ListSessions", NULL, "a(susso)", method_list_sessions, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("ListUsers", NULL, "a(uso)", method_list_users, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("ListSeats", NULL, "a(so)", method_list_seats, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("ListInhibitors", NULL, "a(ssssuu)", method_list_inhibitors, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("CreateSession", "uussssussbssa(sv)", "soshusub", method_create_session, 0),
         SD_BUS_METHOD("ReleaseSession", "s", NULL, method_release_session, 0),
-        SD_BUS_METHOD("ActivateSession", "s", NULL, method_activate_session, 0),
-        SD_BUS_METHOD("ActivateSessionOnSeat", "ss", NULL, method_activate_session_on_seat, 0),
+        SD_BUS_METHOD("ActivateSession", "s", NULL, method_activate_session, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("ActivateSessionOnSeat", "ss", NULL, method_activate_session_on_seat, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_METHOD("LockSession", "s", NULL, method_lock_session, 0),
         SD_BUS_METHOD("UnlockSession", "s", NULL, method_lock_session, 0),
         SD_BUS_METHOD("LockSessions", NULL, NULL, method_lock_sessions, 0),
         SD_BUS_METHOD("UnlockSessions", NULL, NULL, method_lock_sessions, 0),
-        SD_BUS_METHOD("KillSession", "ssi", NULL, method_kill_session, 0),
-        SD_BUS_METHOD("KillUser", "ui", NULL, method_kill_user, 0),
-        SD_BUS_METHOD("TerminateSession", "s", NULL, method_terminate_session, 0),
-        SD_BUS_METHOD("TerminateUser", "u", NULL, method_terminate_user, 0),
-        SD_BUS_METHOD("TerminateSeat", "s", NULL, method_terminate_seat, 0),
-        SD_BUS_METHOD("SetUserLinger", "ubb", NULL, method_set_user_linger, 0),
-        SD_BUS_METHOD("AttachDevice", "ssb", NULL, method_attach_device, 0),
-        SD_BUS_METHOD("FlushDevices", "b", NULL, method_flush_devices, 0),
-        SD_BUS_METHOD("PowerOff", "b", NULL, method_poweroff, 0),
-        SD_BUS_METHOD("Reboot", "b", NULL, method_reboot, 0),
-        SD_BUS_METHOD("Suspend", "b", NULL, method_suspend, 0),
-        SD_BUS_METHOD("Hibernate", "b", NULL, method_hibernate, 0),
-        SD_BUS_METHOD("HybridSleep", "b", NULL, method_hybrid_sleep, 0),
-        SD_BUS_METHOD("CanPowerOff", NULL, "s", method_can_poweroff, 0),
-        SD_BUS_METHOD("CanReboot", NULL, "s", method_can_reboot, 0),
-        SD_BUS_METHOD("CanSuspend", NULL, "s", method_can_suspend, 0),
-        SD_BUS_METHOD("CanHibernate", NULL, "s", method_can_hibernate, 0),
-        SD_BUS_METHOD("CanHybridSleep", NULL, "s", method_can_hybrid_sleep, 0),
-        SD_BUS_METHOD("Inhibit", "ssss", "h", method_inhibit, 0),
+        SD_BUS_METHOD("KillSession", "ssi", NULL, method_kill_session, SD_BUS_VTABLE_CAPABILITY(CAP_KILL)),
+        SD_BUS_METHOD("KillUser", "ui", NULL, method_kill_user, SD_BUS_VTABLE_CAPABILITY(CAP_KILL)),
+        SD_BUS_METHOD("TerminateSession", "s", NULL, method_terminate_session, SD_BUS_VTABLE_CAPABILITY(CAP_KILL)),
+        SD_BUS_METHOD("TerminateUser", "u", NULL, method_terminate_user, SD_BUS_VTABLE_CAPABILITY(CAP_KILL)),
+        SD_BUS_METHOD("TerminateSeat", "s", NULL, method_terminate_seat, SD_BUS_VTABLE_CAPABILITY(CAP_KILL)),
+        SD_BUS_METHOD("SetUserLinger", "ubb", NULL, method_set_user_linger, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("AttachDevice", "ssb", NULL, method_attach_device, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("FlushDevices", "b", NULL, method_flush_devices, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("PowerOff", "b", NULL, method_poweroff, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("Reboot", "b", NULL, method_reboot, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("Suspend", "b", NULL, method_suspend, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("Hibernate", "b", NULL, method_hibernate, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("HybridSleep", "b", NULL, method_hybrid_sleep, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("CanPowerOff", NULL, "s", method_can_poweroff, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("CanReboot", NULL, "s", method_can_reboot, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("CanSuspend", NULL, "s", method_can_suspend, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("CanHibernate", NULL, "s", method_can_hibernate, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("CanHybridSleep", NULL, "s", method_can_hybrid_sleep, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("Inhibit", "ssss", "h", method_inhibit, SD_BUS_VTABLE_UNPRIVILEGED),
 
         SD_BUS_SIGNAL("SessionNew", "so", 0),
         SD_BUS_SIGNAL("SessionRemoved", "so", 0),
@@ -1880,7 +1904,7 @@ const sd_bus_vtable manager_vtable[] = {
         SD_BUS_VTABLE_END
 };
 
-int match_job_removed(sd_bus *bus, sd_bus_message *message, void *userdata) {
+int match_job_removed(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         const char *path, *result, *unit;
         Manager *m = userdata;
         Session *session;
@@ -1894,8 +1918,8 @@ int match_job_removed(sd_bus *bus, sd_bus_message *message, void *userdata) {
 
         r = sd_bus_message_read(message, "uoss", &id, &path, &unit, &result);
         if (r < 0) {
-                log_error("Failed to parse JobRemoved message: %s", strerror(-r));
-                return 0;
+                bus_log_parse_error(r);
+                return r;
         }
 
         if (m->action_job && streq(m->action_job, path)) {
@@ -1923,10 +1947,10 @@ int match_job_removed(sd_bus *bus, sd_bus_message *message, void *userdata) {
                         if (streq(result, "done"))
                                 session_send_create_reply(session, NULL);
                         else {
-                                _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+                                _cleanup_bus_error_free_ sd_bus_error e = SD_BUS_ERROR_NULL;
 
-                                sd_bus_error_setf(&error, BUS_ERROR_JOB_FAILED, "Start job for unit %s failed with '%s'", unit, result);
-                                session_send_create_reply(session, &error);
+                                sd_bus_error_setf(&e, BUS_ERROR_JOB_FAILED, "Start job for unit %s failed with '%s'", unit, result);
+                                session_send_create_reply(session, &e);
                         }
                 } else
                         session_save(session);
@@ -1954,7 +1978,7 @@ int match_job_removed(sd_bus *bus, sd_bus_message *message, void *userdata) {
         return 0;
 }
 
-int match_unit_removed(sd_bus *bus, sd_bus_message *message, void *userdata) {
+int match_unit_removed(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         const char *path, *unit;
         Manager *m = userdata;
         Session *session;
@@ -1967,8 +1991,8 @@ int match_unit_removed(sd_bus *bus, sd_bus_message *message, void *userdata) {
 
         r = sd_bus_message_read(message, "so", &unit, &path);
         if (r < 0) {
-                log_error("Failed to parse UnitRemoved message: %s", strerror(-r));
-                return 0;
+                bus_log_parse_error(r);
+                return r;
         }
 
         session = hashmap_get(m->session_units, unit);
@@ -1982,12 +2006,13 @@ int match_unit_removed(sd_bus *bus, sd_bus_message *message, void *userdata) {
         return 0;
 }
 
-int match_properties_changed(sd_bus *bus, sd_bus_message *message, void *userdata) {
+int match_properties_changed(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         _cleanup_free_ char *unit = NULL;
         Manager *m = userdata;
         const char *path;
         Session *session;
         User *user;
+        int r;
 
         assert(bus);
         assert(message);
@@ -1997,9 +2022,9 @@ int match_properties_changed(sd_bus *bus, sd_bus_message *message, void *userdat
         if (!path)
                 return 0;
 
-        unit_name_from_dbus_path(path, &unit);
-        if (!unit)
-                return 0;
+        r = unit_name_from_dbus_path(path, &unit);
+        if (r < 0)
+                return r;
 
         session = hashmap_get(m->session_units, unit);
         if (session)
@@ -2012,7 +2037,7 @@ int match_properties_changed(sd_bus *bus, sd_bus_message *message, void *userdat
         return 0;
 }
 
-int match_reloading(sd_bus *bus, sd_bus_message *message, void *userdata) {
+int match_reloading(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
         Session *session;
         Iterator i;
@@ -2022,8 +2047,8 @@ int match_reloading(sd_bus *bus, sd_bus_message *message, void *userdata) {
 
         r = sd_bus_message_read(message, "b", &b);
         if (r < 0) {
-                log_error("Failed to parse Reloading message: %s", strerror(-r));
-                return 0;
+                bus_log_parse_error(r);
+                return r;
         }
 
         if (b)
@@ -2038,7 +2063,7 @@ int match_reloading(sd_bus *bus, sd_bus_message *message, void *userdata) {
         return 0;
 }
 
-int match_name_owner_changed(sd_bus *bus, sd_bus_message *message, void *userdata) {
+int match_name_owner_changed(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         const char *name, *old, *new;
         Manager *m = userdata;
         Session *session;
@@ -2050,8 +2075,8 @@ int match_name_owner_changed(sd_bus *bus, sd_bus_message *message, void *userdat
 
         r = sd_bus_message_read(message, "sss", &name, &old, &new);
         if (r < 0) {
-                log_error("Failed to parse NameOwnerChanged message: %s", strerror(-r));
-                return 0;
+                bus_log_parse_error(r);
+                return r;
         }
 
         if (isempty(old) || !isempty(new))
@@ -2088,6 +2113,7 @@ int manager_send_changed(Manager *manager, const char *property, ...) {
 
 int manager_dispatch_delayed(Manager *manager) {
         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+        Inhibitor *offending = NULL;
         int r;
 
         assert(manager);
@@ -2096,12 +2122,18 @@ int manager_dispatch_delayed(Manager *manager) {
                 return 0;
 
         /* Continue delay? */
-        if (manager_is_inhibited(manager, manager->action_what, INHIBIT_DELAY, NULL, false, false, 0)) {
+        if (manager_is_inhibited(manager, manager->action_what, INHIBIT_DELAY, NULL, false, false, 0, &offending)) {
+                _cleanup_free_ char *comm = NULL, *u = NULL;
+
+                get_process_comm(offending->pid, &comm);
+                u = uid_to_name(offending->uid);
 
                 if (manager->action_timestamp + manager->inhibit_delay_max > now(CLOCK_MONOTONIC))
                         return 0;
 
-                log_info("Delay lock is active but inhibitor timeout is reached.");
+                log_info("Delay lock is active (UID %lu/%s, PID %lu/%s) but inhibitor timeout is reached.",
+                         (unsigned long) offending->uid, strna(u),
+                         (unsigned long) offending->pid, strna(comm));
         }
 
         /* Actually do the operation */
@@ -2200,7 +2232,11 @@ int manager_start_scope(
         if (r < 0)
                 return r;
 
-        r = sd_bus_send_with_reply_and_block(manager->bus, m, 0, error, &reply);
+        r = sd_bus_message_append(m, "a(sa(sv))", 0);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_call(manager->bus, m, 0, error, &reply);
         if (r < 0)
                 return r;