util.sasl.scram: Fixing issue #177.

diff --git a/util/sasl/scram.lua b/util/sasl/scram.lua
index 39daf39773f89f33e35dbb1654b3ceeca9dcf995..47e8e7b3588f08ea032ffba54b4a96eae0e4e715 100644 (file)
--- a/util/sasl/scram.lua
+++ b/util/sasl/scram.lua
@@ -108,6 +108,7 @@ local function scram_gen(hash_name, H_f, HMAC_f)
        local function scram_hash(self, message)
                if not self.state then self["state"] = {} end
        
+               if type(message) ~= "string" or #message == 0 then return "failure", "malformed-request" end
                if not self.state.name then
                        -- we are processing client_first_message
                        local client_first_message = message;
@@ -169,7 +170,6 @@ local function scram_gen(hash_name, H_f, HMAC_f)
                        self.state["server_first_message"] = server_first_message;
                        return "challenge", server_first_message
                else
-                       if type(message) ~= "string" then return "failure", "malformed-request" end
                        -- we are processing client_final_message
                        local client_final_message = message;