/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2011 Lennart Poettering systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <errno.h> #include <string.h> #include "util.h" #include "strv.h" #include "bus-util.h" #include "bus-common-errors.h" #include "bus-label.h" #include "logind.h" #include "logind-session.h" #include "logind-session-device.h" static int property_get_user( 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; Session *s = userdata; assert(bus); assert(reply); assert(s); p = user_bus_path(s->user); if (!p) return -ENOMEM; return sd_bus_message_append(reply, "(uo)", (uint32_t) s->user->uid, p); } static int property_get_name( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) { Session *s = userdata; assert(bus); assert(reply); assert(s); return sd_bus_message_append(reply, "s", s->user->name); } static int property_get_seat( 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; Session *s = userdata; assert(bus); assert(reply); assert(s); p = s->seat ? seat_bus_path(s->seat) : strdup("/"); if (!p) return -ENOMEM; return sd_bus_message_append(reply, "(so)", s->seat ? s->seat->id : "", p); } static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_type, session_type, SessionType); static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_class, session_class, SessionClass); static int property_get_active( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) { Session *s = userdata; assert(bus); assert(reply); assert(s); return sd_bus_message_append(reply, "b", session_is_active(s)); } static int property_get_state( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) { Session *s = userdata; assert(bus); assert(reply); assert(s); return sd_bus_message_append(reply, "s", session_state_to_string(session_get_state(s))); } 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) { Session *s = userdata; assert(bus); assert(reply); assert(s); return sd_bus_message_append(reply, "b", session_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) { Session *s = userdata; dual_timestamp t; uint64_t u; int r; assert(bus); assert(reply); assert(s); r = session_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); } static int method_terminate(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) { Session *s = userdata; int r; assert(bus); assert(message); assert(s); r = session_stop(s, true); if (r < 0) return r; return sd_bus_reply_method_return(message, NULL); } static int method_activate(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) { Session *s = userdata; int r; assert(bus); assert(message); assert(s); r = session_activate(s); if (r < 0) return r; return sd_bus_reply_method_return(message, NULL); } static int method_lock(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) { Session *s = userdata; int r; assert(bus); assert(message); assert(s); r = session_send_lock(s, streq(sd_bus_message_get_member(message), "Lock")); if (r < 0) return r; return sd_bus_reply_method_return(message, NULL); } static int method_set_idle_hint(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) { _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; Session *s = userdata; uid_t uid; int r, b; assert(bus); assert(message); assert(s); r = sd_bus_message_read(message, "b", &b); if (r < 0) return r; r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_UID, &creds); if (r < 0) return r; r = sd_bus_creds_get_uid(creds, &uid); if (r < 0) return r; if (uid != 0 && uid != s->user->uid) return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Only owner of session may set idle hint"); session_set_idle_hint(s, b); return sd_bus_reply_method_return(message, NULL); } static int method_kill(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) { Session *s = userdata; const char *swho; int32_t signo; KillWho who; int r; assert(bus); assert(message); assert(s); r = sd_bus_message_read(message, "si", &swho, &signo); if (r < 0) return r; if (isempty(swho)) who = KILL_ALL; else { who = kill_who_from_string(swho); if (who < 0) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid kill parameter '%s'", swho); } if (signo <= 0 || signo >= _NSIG) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo); r = session_kill(s, who, signo); if (r < 0) return r; return sd_bus_reply_method_return(message, NULL); } static int method_take_control(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) { _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; Session *s = userdata; int r, force; uid_t uid; assert(bus); assert(message); assert(s); r = sd_bus_message_read(message, "b", &force); if (r < 0) return r; r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_UID, &creds); if (r < 0) return r; r = sd_bus_creds_get_uid(creds, &uid); if (r < 0) return r; if (uid != 0 && (force || uid != s->user->uid)) return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Only owner of session may take control"); r = session_set_controller(s, sd_bus_message_get_sender(message), force); if (r < 0) return r; return sd_bus_reply_method_return(message, NULL); } static int method_release_control(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) { Session *s = userdata; assert(bus); assert(message); assert(s); if (!session_is_controller(s, sd_bus_message_get_sender(message))) return sd_bus_error_setf(error, BUS_ERROR_NOT_IN_CONTROL, "You are not in control of this session"); session_drop_controller(s); return sd_bus_reply_method_return(message, NULL); } static int method_take_device(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) { Session *s = userdata; uint32_t major, minor; SessionDevice *sd; dev_t dev; int r; assert(bus); assert(message); assert(s); r = sd_bus_message_read(message, "uu", &major, &minor); if (r < 0) return r; if (!session_is_controller(s, sd_bus_message_get_sender(message))) return sd_bus_error_setf(error, BUS_ERROR_NOT_IN_CONTROL, "You are not in control of this session"); dev = makedev(major, minor); sd = hashmap_get(s->devices, &dev); if (sd) /* We don't allow retrieving a device multiple times. * The related ReleaseDevice call is not ref-counted. * The caller should use dup() if it requires more * than one fd (it would be functionally * equivalent). */ return sd_bus_error_setf(error, BUS_ERROR_DEVICE_IS_TAKEN, "Device already taken"); r = session_device_new(s, dev, &sd); if (r < 0) return r; r = sd_bus_reply_method_return(message, "hb", sd->fd, !sd->active); if (r < 0) session_device_free(sd); return r; } static int method_release_device(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) { Session *s = userdata; uint32_t major, minor; SessionDevice *sd; dev_t dev; int r; assert(bus); assert(message); assert(s); r = sd_bus_message_read(message, "uu", &major, &minor); if (r < 0) return r; if (!session_is_controller(s, sd_bus_message_get_sender(message))) return sd_bus_error_setf(error, BUS_ERROR_NOT_IN_CONTROL, "You are not in control of this session"); dev = makedev(major, minor); sd = hashmap_get(s->devices, &dev); if (!sd) return sd_bus_error_setf(error, BUS_ERROR_DEVICE_NOT_TAKEN, "Device not taken"); session_device_free(sd); return sd_bus_reply_method_return(message, NULL); } static int method_pause_device_complete(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) { Session *s = userdata; uint32_t major, minor; SessionDevice *sd; dev_t dev; int r; assert(bus); assert(message); assert(s); r = sd_bus_message_read(message, "uu", &major, &minor); if (r < 0) return r; if (!session_is_controller(s, sd_bus_message_get_sender(message))) return sd_bus_error_setf(error, BUS_ERROR_NOT_IN_CONTROL, "You are not in control of this session"); dev = makedev(major, minor); sd = hashmap_get(s->devices, &dev); if (!sd) return sd_bus_error_setf(error, BUS_ERROR_DEVICE_NOT_TAKEN, "Device not taken"); session_device_complete_pause(sd); return sd_bus_reply_method_return(message, NULL); } const sd_bus_vtable session_vtable[] = { SD_BUS_VTABLE_START(0), SD_BUS_PROPERTY("Id", "s", NULL, offsetof(Session, id), SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("User", "(uo)", property_get_user, 0, SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("Name", "s", property_get_name, 0, SD_BUS_VTABLE_PROPERTY_CONST), BUS_PROPERTY_DUAL_TIMESTAMP("Timestamp", offsetof(Session, timestamp), SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("VTNr", "u", NULL, offsetof(Session, vtnr), SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("Seat", "(so)", property_get_seat, 0, SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("TTY", "s", NULL, offsetof(Session, tty), SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("Display", "s", NULL, offsetof(Session, display), SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("Remote", "b", bus_property_get_bool, offsetof(Session, remote), SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("RemoteHost", "s", NULL, offsetof(Session, remote_host), SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("RemoteUser", "s", NULL, offsetof(Session, remote_user), SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("Service", "s", NULL, offsetof(Session, service), SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("Desktop", "s", NULL, offsetof(Session, desktop), SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("Scope", "s", NULL, offsetof(Session, scope), SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("Leader", "u", bus_property_get_pid, offsetof(Session, leader), SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("Audit", "u", NULL, offsetof(Session, audit_id), SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("Type", "s", property_get_type, offsetof(Session, type), SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("Class", "s", property_get_class, offsetof(Session, class), SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("Active", "b", property_get_active, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), SD_BUS_PROPERTY("State", "s", property_get_state, 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, method_terminate, SD_BUS_VTABLE_CAPABILITY(CAP_KILL)), SD_BUS_METHOD("Activate", NULL, NULL, method_activate, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("Lock", NULL, NULL, method_lock, 0), SD_BUS_METHOD("Unlock", NULL, NULL, method_lock, 0), SD_BUS_METHOD("SetIdleHint", "b", NULL, method_set_idle_hint, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("Kill", "si", NULL, method_kill, SD_BUS_VTABLE_CAPABILITY(CAP_KILL)), SD_BUS_METHOD("TakeControl", "b", NULL, method_take_control, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("ReleaseControl", NULL, NULL, method_release_control, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("TakeDevice", "uu", "hb", method_take_device, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("ReleaseDevice", "uu", NULL, method_release_device, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("PauseDeviceComplete", "uu", NULL, method_pause_device_complete, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_SIGNAL("PauseDevice", "uus", 0), SD_BUS_SIGNAL("ResumeDevice", "uuh", 0), SD_BUS_SIGNAL("Lock", NULL, 0), SD_BUS_SIGNAL("Unlock", NULL, 0), SD_BUS_VTABLE_END }; int session_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) { Manager *m = userdata; Session *session; int r; assert(bus); assert(path); assert(interface); assert(found); assert(m); if (streq(path, "/org/freedesktop/login1/session/self")) { _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; sd_bus_message *message; pid_t pid; message = sd_bus_get_current_message(bus); if (!message) return 0; 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 0; } else { _cleanup_free_ char *e = NULL; const char *p; p = startswith(path, "/org/freedesktop/login1/session/"); if (!p) return 0; e = bus_label_unescape(p); if (!e) return -ENOMEM; session = hashmap_get(m->sessions, e); if (!session) return 0; } *found = session; return 1; } char *session_bus_path(Session *s) { _cleanup_free_ char *t = NULL; assert(s); t = bus_label_escape(s->id); if (!t) return NULL; return strappend("/org/freedesktop/login1/session/", t); } int session_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) { _cleanup_strv_free_ char **l = NULL; Manager *m = userdata; Session *session; Iterator i; int r; assert(bus); assert(path); assert(nodes); HASHMAP_FOREACH(session, m->sessions, i) { char *p; p = session_bus_path(session); if (!p) return -ENOMEM; r = strv_consume(&l, p); if (r < 0) return r; } *nodes = l; l = NULL; return 1; } int session_send_signal(Session *s, bool new_session) { _cleanup_free_ char *p = NULL; assert(s); p = session_bus_path(s); if (!p) return -ENOMEM; return sd_bus_emit_signal( s->manager->bus, "/org/freedesktop/login1", "org.freedesktop.login1.Manager", new_session ? "SessionNew" : "SessionRemoved", "so", s->id, p); } int session_send_changed(Session *s, const char *properties, ...) { _cleanup_free_ char *p = NULL; char **l; assert(s); if (!s->started) return 0; p = session_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.Session", l); } int session_send_lock(Session *s, bool lock) { _cleanup_free_ char *p = NULL; assert(s); p = session_bus_path(s); if (!p) return -ENOMEM; return sd_bus_emit_signal( s->manager->bus, p, "org.freedesktop.login1.Session", lock ? "Lock" : "Unlock", NULL); } int session_send_lock_all(Manager *m, bool lock) { Session *session; Iterator i; int r = 0; assert(m); HASHMAP_FOREACH(session, m->sessions, i) { int k; k = session_send_lock(session, lock); if (k < 0) r = k; } return r; } int session_send_create_reply(Session *s, sd_bus_error *error) { _cleanup_bus_message_unref_ sd_bus_message *c = NULL; _cleanup_close_ int fifo_fd = -1; _cleanup_free_ char *p = NULL; assert(s); /* This is called after the session scope and the user service * were successfully created, and finishes where * bus_manager_create_session() left off. */ if (!s->create_message) return 0; if (!sd_bus_error_is_set(error) && (s->scope_job || s->user->service_job)) return 0; c = s->create_message; s->create_message = NULL; if (error) return sd_bus_reply_method_error(c, error); fifo_fd = session_create_fifo(s); if (fifo_fd < 0) return fifo_fd; /* Update the session state file before we notify the client * about the result. */ session_save(s); p = session_bus_path(s); if (!p) return -ENOMEM; log_debug("Sending reply about created session: " "id=%s object_path=%s uid=%u runtime_path=%s " "session_fd=%d seat=%s vtnr=%u", s->id, p, (uint32_t) s->user->uid, s->user->runtime_path, fifo_fd, s->seat ? s->seat->id : "", (uint32_t) s->vtnr); return sd_bus_reply_method_return( c, "soshusub", s->id, p, s->user->runtime_path, fifo_fd, (uint32_t) s->user->uid, s->seat ? s->seat->id : "", (uint32_t) s->vtnr, false); }