Allow using key files with BITLK devices

Fixes: #1252

src/tests/dbus-tests/test_70_encrypted.py

@@ -786,5 +786,21 @@ def test_open_close(self):
         objects = udisks.GetManagedObjects(dbus_interface='org.freedesktop.DBus.ObjectManager')
         self.assertNotIn(str(crypt_path), objects.keys())
 
+        # unlock with keyfile contents
+        d = dbus.Dictionary(signature='sv')
+        d['keyfile_contents'] = self.str_to_ay(self.passphrase, False)
+        crypt_path = self.loop.Unlock("", d,
+                                      dbus_interface=self.iface_prefix + '.Encrypted')
+        self.assertIsNotNone(crypt_path)
+        crypt_dev = self.bus.get_object(self.iface_prefix, crypt_path)
+        self.assertIsNotNone(crypt_dev)
+
+        dbus_cleartext = self.get_property(self.loop, '.Encrypted', 'CleartextDevice')
+        dbus_cleartext.assertEqual(str(crypt_path))
+        dbus_type = self.get_property(self.loop, '.Encrypted', 'HintEncryptionType')
+        dbus_type.assertEqual("BITLK")
+
+        self.loop.Lock(self.no_options, dbus_interface=self.iface_prefix + '.Encrypted')
+
 
 del UdisksEncryptedTest  # skip UdisksEncryptedTest

src/udiskslinuxencrypted.c

@@ -465,8 +465,8 @@ handle_unlock (UDisksEncrypted        *encrypted,
       goto out;
     }
 
-  /* fallback mechanism: keyfile_contents (for LUKS) -> passphrase -> crypttab_passphrase -> TCRYPT keyfiles -> error (no key) */
-  if (is_luks && udisks_variant_lookup_binary (options, "keyfile_contents", &effective_passphrase))
+  /* fallback mechanism: keyfile_contents (for LUKS and BITLK) -> passphrase -> crypttab_passphrase -> TCRYPT keyfiles -> error (no key) */
+  if ((is_luks || is_bitlk) && udisks_variant_lookup_binary (options, "keyfile_contents", &effective_passphrase))
     {
       /* effective_passphrase was set to keyfile_contents, nothing more to do here */
     }