o [NSE] Added the script socks-brute that performs brute force password

guessing against SOCKS 5 servers. [Patrik]

scripts/socks-brute.nse

@@ -0,0 +1,98 @@
+description = [[
+Performs brute force password guessing against SOCKS 5 servers
+]]
+
+---
+-- @usage
+-- nmap --script socks-brute -p 1080 <host>
+--
+-- @output
+-- PORT     STATE SERVICE
+-- 1080/tcp open  socks
+-- | socks-brute: 
+-- |   Accounts
+-- |     patrik:12345 - Valid credentials
+-- |   Statistics
+-- |_    Performed 1921 guesses in 6 seconds, average tps: 320
+--
+
+author = "Patrik Karlsson"
+license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
+categories = {"brute", "intrusive"}
+
+require 'brute'
+require 'shortport'
+require 'socks'
+
+portrule = shortport.port_or_service({1080, 9050}, {"socks", "socks5", "tor-socks"})
+
+Driver = {
+	
+	new = function (self, host, port)
+		local o = { host = host, port = port }
+		setmetatable (o,self)
+		self.__index = self
+		return o
+	end,
+
+	connect = function ( self )
+		self.helper = socks.Helper:new(self.host, self.port, { timeout = 10000 })
+		return self.helper:connect()
+	end,
+	
+	login = function( self, username, password )
+		local status, err = self.helper:authenticate({username=username, password=password})
+
+		if (not(status)) then
+			-- the login failed
+			if ( "Authentication failed" == err ) then
+				return false, brute.Error:new( "Login failed" )
+			end
+			
+			-- something else happend, let's retry
+			local err = brute.Error:new( err )
+			err:setRetry( true )
+			return false, err
+		end
+
+		return true, brute.Account:new(username, password, creds.State.VALID)
+	end,
+	
+	disconnect = function( self )
+		return self.helper:close()
+	end,	
+}
+
+local function checkAuth(host, port)
+
+	local helper = socks.Helper:new(host, port)
+	local status, response = helper:connect()
+	if ( not(status) ) then
+		return false, response
+	end
+	
+	if ( response.method == socks.AuthMethod.NONE ) then
+		return false, "\n  No authentication required"
+	end
+	
+	local status, err = helper:authenticate({username="nmap", password="nmapbruteprobe"})
+	if ( err ~= "Authentication failed" ) then
+		return false, ("\n  ERROR: %s"):format(err)
+	end
+
+	helper:close()
+	return true
+end
+
+action = function(host, port)
+
+	local status, response = checkAuth(host, port)
+	if ( not(status) ) then
+		return response
+	end
+
+	local engine = brute.Engine:new(Driver, host, port)
+	engine.options.script_name = SCRIPT_NAME
+	status, result = engine:start()
+	return result
+end