chiark / gitweb /
logind: save/restore session devices and their respective file descriptors
[elogind.git] / src / login / logind-session-dbus.c
index fc728bb..1316c50 100644 (file)
@@ -1,5 +1,3 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
 /***
   This file is part of systemd.
 
 
 #include <errno.h>
 #include <string.h>
-#include <sys/capability.h>
 
-#include "util.h"
-#include "strv.h"
+#include "alloc-util.h"
+#include "bus-common-errors.h"
+#include "bus-label.h"
 #include "bus-util.h"
-#include "bus-errors.h"
-
-#include "logind.h"
-#include "logind-session.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,
@@ -163,7 +163,7 @@ static int property_get_idle_since_hint(
                 sd_bus_error *error) {
 
         Session *s = userdata;
-        dual_timestamp t;
+        dual_timestamp t = DUAL_TIMESTAMP_NULL;
         uint64_t u;
         int r;
 
@@ -180,14 +180,45 @@ static int property_get_idle_since_hint(
         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) {
+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;
-        int r;
 
         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;
@@ -195,11 +226,10 @@ static int method_terminate(sd_bus *bus, sd_bus_message *message, void *userdata
         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) {
+int bus_session_method_activate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Session *s = userdata;
         int r;
 
-        assert(bus);
         assert(message);
         assert(s);
 
@@ -210,28 +240,40 @@ static int method_activate(sd_bus *bus, sd_bus_message *message, void *userdata,
         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) {
+int bus_session_method_lock(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"));
+        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 *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
-        _cleanup_bus_creds_unref_ sd_bus_creds *creds = 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(bus);
         assert(message);
         assert(s);
 
@@ -239,30 +281,58 @@ static int method_set_idle_hint(sd_bus *bus, sd_bus_message *message, void *user
         if (r < 0)
                 return r;
 
-        r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_UID, &creds);
+        r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID, &creds);
         if (r < 0)
                 return r;
 
-        r = sd_bus_creds_get_uid(creds, &uid);
+        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 my set idle hint");
+                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) {
+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(bus);
         assert(message);
         assert(s);
 
@@ -278,9 +348,23 @@ static int method_kill(sd_bus *bus, sd_bus_message *message, void *userdata, sd_
                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid kill parameter '%s'", swho);
         }
 
-        if (signo <= 0 || signo >= _NSIG)
+        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;
@@ -288,13 +372,12 @@ static int method_kill(sd_bus *bus, sd_bus_message *message, void *userdata, sd_
         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;
+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(bus);
         assert(message);
         assert(s);
 
@@ -302,28 +385,27 @@ static int method_take_control(sd_bus *bus, sd_bus_message *message, void *userd
         if (r < 0)
                 return r;
 
-        r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_UID, &creds);
+        r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID, &creds);
         if (r < 0)
                 return r;
 
-        r = sd_bus_creds_get_uid(creds, &uid);
+        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);
+        r = session_set_controller(s, sd_bus_message_get_sender(message), force, true);
         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) {
+static int method_release_control(sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Session *s = userdata;
 
-        assert(bus);
         assert(message);
         assert(s);
 
@@ -335,14 +417,13 @@ static int method_release_control(sd_bus *bus, sd_bus_message *message, void *us
         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) {
+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(bus);
         assert(message);
         assert(s);
 
@@ -363,25 +444,33 @@ static int method_take_device(sd_bus *bus, sd_bus_message *message, void *userda
                  * equivalent). */
                 return sd_bus_error_setf(error, BUS_ERROR_DEVICE_IS_TAKEN, "Device already taken");
 
-        r = session_device_new(s, dev, &sd);
+        r = session_device_new(s, dev, true, &sd);
         if (r < 0)
                 return r;
 
+        r = session_device_save(sd);
+        if (r < 0)
+                goto error;
+
         r = sd_bus_reply_method_return(message, "hb", sd->fd, !sd->active);
         if (r < 0)
-                session_device_free(sd);
+                goto error;
 
+        session_save(s);
+        return 0;
+
+error:
+        session_device_free(sd);
         return r;
 }
 
-static int method_release_device(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
+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(bus);
         assert(message);
         assert(s);
 
@@ -398,17 +487,18 @@ static int method_release_device(sd_bus *bus, sd_bus_message *message, void *use
                 return sd_bus_error_setf(error, BUS_ERROR_DEVICE_NOT_TAKEN, "Device not taken");
 
         session_device_free(sd);
+        session_save(s);
+
         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) {
+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(bus);
         assert(message);
         assert(s);
 
@@ -455,13 +545,15 @@ const sd_bus_vtable session_vtable[] = {
         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, 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("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("Kill", "si", NULL, method_kill, SD_BUS_VTABLE_CAPABILITY(CAP_KILL)),
+        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),
@@ -488,25 +580,23 @@ int session_object_find(sd_bus *bus, const char *path, const char *interface, vo
         assert(m);
 
         if (streq(path, "/org/freedesktop/login1/session/self")) {
-                _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
+                _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
                 sd_bus_message *message;
-                pid_t pid;
+                const char *name;
 
-                message = sd_bus_get_current(bus);
+                message = sd_bus_get_current_message(bus);
                 if (!message)
                         return 0;
 
-                r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
+                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_pid(creds, &pid);
+                r = sd_bus_creds_get_session(creds, &name);
                 if (r < 0)
                         return r;
 
-                r = manager_get_session_by_pid(m, pid, &session);
-                if (r <= 0)
-                        return 0;
+                session = hashmap_get(m->sessions, name);
         } else {
                 _cleanup_free_ char *e = NULL;
                 const char *p;
@@ -515,15 +605,16 @@ int session_object_find(sd_bus *bus, const char *path, const char *interface, vo
                 if (!p)
                         return 0;
 
-                e = sd_bus_label_unescape(p);
+                e = bus_label_unescape(p);
                 if (!e)
                         return -ENOMEM;
 
                 session = hashmap_get(m->sessions, e);
-                if (!session)
-                        return 0;
         }
 
+        if (!session)
+                return 0;
+
         *found = session;
         return 1;
 }
@@ -533,7 +624,7 @@ char *session_bus_path(Session *s) {
 
         assert(s);
 
-        t = sd_bus_label_escape(s->id);
+        t = bus_label_escape(s->id);
         if (!t)
                 return NULL;
 
@@ -542,6 +633,7 @@ char *session_bus_path(Session *s) {
 
 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;
@@ -563,6 +655,25 @@ int session_node_enumerator(sd_bus *bus, const char *path, void *userdata, char
                         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;
 
@@ -640,7 +751,7 @@ int session_send_lock_all(Manager *m, bool lock) {
 }
 
 int session_send_create_reply(Session *s, sd_bus_error *error) {
-        _cleanup_bus_message_unref_ sd_bus_message *c = NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *c = NULL;
         _cleanup_close_ int fifo_fd = -1;
         _cleanup_free_ char *p = NULL;
 
@@ -653,8 +764,10 @@ int session_send_create_reply(Session *s, sd_bus_error *error) {
         if (!s->create_message)
                 return 0;
 
+#if 0 /// elogind does not support scope and service jobs
         if (!sd_bus_error_is_set(error) && (s->scope_job || s->user->service_job))
                 return 0;
+#endif // 0
 
         c = s->create_message;
         s->create_message = NULL;
@@ -670,14 +783,19 @@ int session_send_create_reply(Session *s, sd_bus_error *error) {
          * about the result. */
         session_save(s);
 
+#if 1 /// Additionally elogind saves the user state file
+        user_save(s->user);
+#endif // 1
         p = session_bus_path(s);
         if (!p)
                 return -ENOMEM;
 
         log_debug("Sending reply about created session: "
-                  "id=%s object_path=%s runtime_path=%s session_fd=%d seat=%s vtnr=%u",
+                  "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 : "",