util.sasl.plain: Allow empty authzid (thanks bjc).

diff --git a/util/sasl/plain.lua b/util/sasl/plain.lua
index a4c8765da7a523c858f629d31a75ea1e3898060b..ae5c777a77423f466ecd5977f696e0f9bec7e313 100644 (file)
--- a/util/sasl/plain.lua
+++ b/util/sasl/plain.lua
@@ -24,7 +24,7 @@ local function plain(self, message)
                return "failure", "malformed-request";
        end
 
-       local authorization, authentication, password = s_match(message, "^([^%z]+)%z([^%z]+)%z([^%z]+)");
+       local authorization, authentication, password = s_match(message, "^([^%z]*)%z([^%z]+)%z([^%z]+)");
 
        if not authorization then
                return "failure", "malformed-request";