worker: add reauthentication support

This commit adds reauthentication support for
screensavers and user switching to use.

1) It adds a "verification mode" argument to the GdmSession constructor
that tweaks the behavior of how the session worker acts to fit login or
unlock scenarios better.

2) It adds a way for programs to open a communication channel for user
verification to already runnings sessions (so reauthentication happens
in the context of the session).

1 files changed, 40 insertions, 0 deletions

diff --git a/daemon/gdm-dbus-util.c b/daemon/gdm-dbus-util.c
index e57f0a0b..94361c66 100644
--- a/daemon/gdm-dbus-util.c
+++ b/daemon/gdm-dbus-util.c
@@ -163,3 +163,43 @@ gdm_dbus_get_pid_for_name (const char  *system_bus_name,
 
         return retval;
 }
+
+gboolean
+gdm_dbus_get_uid_for_name (const char  *system_bus_name,
+                           uid_t       *out_uid,
+                           GError     **error)
+{
+        GDBusConnection *bus;
+        GVariant *reply;
+        gboolean retval = FALSE;
+        unsigned int v;
+
+        bus = g_bus_get_sync (G_BUS_TYPE_SYSTEM, NULL, error);
+        if (bus == NULL) {
+                return FALSE;
+        }
+
+        reply = g_dbus_connection_call_sync (bus,
+                                             "org.freedesktop.DBus",
+                                             "/org/freedesktop/DBus",
+                                             "org.freedesktop.DBus",
+                                             "GetConnectionUnixUser",
+                                             g_variant_new ("(s)", system_bus_name),
+                                             G_VARIANT_TYPE ("(u)"),
+                                             G_DBUS_CALL_FLAGS_NONE,
+                                             -1,
+                                             NULL, error);
+        if (reply == NULL) {
+                goto out;
+        }
+
+        g_variant_get (reply, "(u)", &v);
+        *out_uid = v;
+        g_variant_unref (reply);
+
+        retval = TRUE;
+ out:
+        g_object_unref (bus);
+
+        return retval;
+}