[tang] Add plugin for the Tang NBDE server

sos/report/plugins/tang.py

@@ -0,0 +1,49 @@
+# Copyright (C) 2026 Suraj Patil <surajpatil522@gmail.com>
+
+# This file is part of the sos project: https://github.com/sosreport/sos
+#
+# This copyrighted material is made available to anyone wishing to use,
+# modify, copy, or redistribute it subject to the terms and conditions of
+# version 2 of the GNU General Public License.
+#
+# See the LICENSE file in the source distribution for further information.
+
+from sos.report.plugins import Plugin, IndependentPlugin
+
+
+class Tang(Plugin, IndependentPlugin):
+
+    short_desc = 'Tang network-bound disk encryption server'
+
+    plugin_name = 'tang'
+    profiles = ('security', 'storage', 'services')
+    packages = ('tang',)
+
+    def setup(self):
+        # The key database holds Tang's signing and exchange keys. The
+        # private key material must never leave the host, so forbid the
+        # JWK files outright and collect only a listing of the directory,
+        # which is enough to review the key set, rotation state (keys
+        # renamed with a leading '.' are no longer advertised) and file
+        # ownership.
+        self.add_forbidden_path([
+            '/var/db/tang/*.jwk',
+            '/var/db/tang/.*.jwk',
+            '/usr/share/tang/db/*.jwk',
+            '/usr/share/tang/db/.*.jwk',
+        ])
+
+        self.add_dir_listing([
+            '/var/db/tang',
+            '/usr/share/tang/db',
+        ], tags='tang_keydir')
+
+        self.add_copy_spec('/etc/systemd/system/tangd.socket.d/')
+
+        # Advertised key thumbprints only; no private key material.
+        self.add_cmd_output('tang-show-keys', tags='tang_show_keys')
+
+        self.add_service_status('tangd.socket')
+        self.add_journal(units=['tangd.socket', 'tangd@.service'])
+
+# vim: set et ts=4 sw=4 :