# HG changeset patch
# User Kim Alvefur <zash@zash.se>
# Date 1572704873 -3600
# Node ID b337df192a10fa364157443f70ffcca443c5af77
# Parent  3d0adbc74c39fb5723d1d4d0f831c40887d78c29
mod_dialback: Abort early if request is missing addressing attributes

Prevents traceback from passing nil to nameprep()

diff -r 3d0adbc74c39 -r b337df192a10 plugins/mod_dialback.lua
--- a/plugins/mod_dialback.lua	Sat Nov 02 13:56:13 2019 +0100
+++ b/plugins/mod_dialback.lua	Sat Nov 02 15:27:53 2019 +0100
@@ -93,6 +93,11 @@
 		-- he wants to be identified through dialback
 		-- We need to check the key with the Authoritative server
 		local attr = stanza.attr;
+		if not attr.to or not attr.from then
+			origin.log("debug", "Missing Dialback addressing (from=%q, to=%q)", attr.from, attr.to);
+			origin:close("improper-addressing");
+			return true;
+		end
 		local to, from = nameprep(attr.to), nameprep(attr.from);
 
 		if not hosts[to] then