diff options
Diffstat (limited to 'src/grp-login/logind-session-dbus.c')
| -rw-r--r-- | src/grp-login/logind-session-dbus.c | 798 |
1 files changed, 798 insertions, 0 deletions
diff --git a/src/grp-login/logind-session-dbus.c b/src/grp-login/logind-session-dbus.c new file mode 100644 index 0000000000..22dea5db1f --- /dev/null +++ b/src/grp-login/logind-session-dbus.c @@ -0,0 +1,798 @@ +/*** + 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 "alloc-util.h" +#include "bus-common-errors.h" +#include "bus-label.h" +#include "bus-util.h" +#include "fd-util.h" +#include "logind-session-device.h" +#include "logind-session.h" +#include "logind.h" +#include "signal-util.h" +#include "strv.h" +#include "util.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 = DUAL_TIMESTAMP_NULL; + 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 property_get_locked_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_locked_hint(s) > 0); +} + +int bus_session_method_terminate(sd_bus_message *message, void *userdata, sd_bus_error *error) { + Session *s = userdata; + int r; + + assert(message); + assert(s); + + r = bus_verify_polkit_async( + message, + CAP_KILL, + "org.freedesktop.login1.manage", + NULL, + false, + s->user->uid, + &s->manager->polkit_registry, + error); + if (r < 0) + return r; + if (r == 0) + return 1; /* Will call us back */ + + r = session_stop(s, true); + if (r < 0) + return r; + + return sd_bus_reply_method_return(message, NULL); +} + +int bus_session_method_activate(sd_bus_message *message, void *userdata, sd_bus_error *error) { + Session *s = userdata; + int r; + + assert(message); + assert(s); + + r = session_activate(s); + if (r < 0) + return r; + + return sd_bus_reply_method_return(message, NULL); +} + +int bus_session_method_lock(sd_bus_message *message, void *userdata, sd_bus_error *error) { + Session *s = userdata; + int r; + + assert(message); + assert(s); + + r = bus_verify_polkit_async( + message, + CAP_SYS_ADMIN, + "org.freedesktop.login1.lock-sessions", + NULL, + false, + s->user->uid, + &s->manager->polkit_registry, + error); + if (r < 0) + return r; + if (r == 0) + return 1; /* Will call us back */ + + r = session_send_lock(s, strstr(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_message *message, void *userdata, sd_bus_error *error) { + _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL; + Session *s = userdata; + uid_t uid; + int r, b; + + 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_EUID, &creds); + if (r < 0) + return r; + + r = sd_bus_creds_get_euid(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_set_locked_hint(sd_bus_message *message, void *userdata, sd_bus_error *error) { + _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL; + Session *s = userdata; + uid_t uid; + int r, b; + + 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_EUID, &creds); + if (r < 0) + return r; + + r = sd_bus_creds_get_euid(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 locked hint"); + + session_set_locked_hint(s, b); + + return sd_bus_reply_method_return(message, NULL); +} + +int bus_session_method_kill(sd_bus_message *message, void *userdata, sd_bus_error *error) { + Session *s = userdata; + const char *swho; + int32_t signo; + KillWho who; + int r; + + 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 (!SIGNAL_VALID(signo)) + return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo); + + r = bus_verify_polkit_async( + message, + CAP_KILL, + "org.freedesktop.login1.manage", + NULL, + false, + s->user->uid, + &s->manager->polkit_registry, + error); + if (r < 0) + return r; + if (r == 0) + return 1; /* Will call us back */ + + 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_message *message, void *userdata, sd_bus_error *error) { + _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL; + Session *s = userdata; + int r, force; + uid_t uid; + + 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_EUID, &creds); + if (r < 0) + return r; + + r = sd_bus_creds_get_euid(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_message *message, void *userdata, sd_bus_error *error) { + Session *s = userdata; + + 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_message *message, void *userdata, sd_bus_error *error) { + Session *s = userdata; + uint32_t major, minor; + SessionDevice *sd; + dev_t dev; + int r; + + 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_message *message, void *userdata, sd_bus_error *error) { + Session *s = userdata; + uint32_t major, minor; + SessionDevice *sd; + dev_t dev; + int r; + + 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_message *message, void *userdata, sd_bus_error *error) { + Session *s = userdata; + uint32_t major, minor; + SessionDevice *sd; + dev_t dev; + int r; + + 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_PROPERTY("LockedHint", "b", property_get_locked_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), + + SD_BUS_METHOD("Terminate", NULL, NULL, bus_session_method_terminate, SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD("Activate", NULL, NULL, bus_session_method_activate, SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD("Lock", NULL, NULL, bus_session_method_lock, SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD("Unlock", NULL, NULL, bus_session_method_lock, SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD("SetIdleHint", "b", NULL, method_set_idle_hint, SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD("SetLockedHint", "b", NULL, method_set_locked_hint, SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD("Kill", "si", NULL, bus_session_method_kill, SD_BUS_VTABLE_UNPRIVILEGED), + 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_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL; + sd_bus_message *message; + const char *name; + + message = sd_bus_get_current_message(bus); + if (!message) + return 0; + + r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_SESSION|SD_BUS_CREDS_AUGMENT, &creds); + if (r < 0) + return r; + + r = sd_bus_creds_get_session(creds, &name); + if (r < 0) + return r; + + session = hashmap_get(m->sessions, name); + } 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; + sd_bus_message *message; + 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; + } + + message = sd_bus_get_current_message(bus); + if (message) { + _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL; + const char *name; + + r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_SESSION|SD_BUS_CREDS_AUGMENT, &creds); + if (r >= 0) { + r = sd_bus_creds_get_session(creds, &name); + if (r >= 0) { + session = hashmap_get(m->sessions, name); + if (session) { + r = strv_extend(&l, "/org/freedesktop/login1/session/self"); + 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_(sd_bus_message_unrefp) 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); +} |