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local brute = require "brute"
local creds = require "creds"
local membase = require "membase"
local shortport = require "shortport"
local stdnse = require "stdnse"
description = [[
Performs brute force password auditing against Couchbase Membase servers.
]]
---
-- @usage
-- nmap -p 11211 --script membase-brute
--
-- @output
-- PORT STATE SERVICE
-- 11211/tcp open unknown
-- | membase-brute:
-- | Accounts
-- | buckettest:toledo - Valid credentials
-- | Statistics
-- |_ Performed 5000 guesses in 2 seconds, average tps: 2500
--
-- @args membase-brute.bucketname if specified, password guessing is performed
-- only against this bucket.
--
author = "Patrik Karlsson"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"intrusive", "brute"}
portrule = shortport.port_or_service({11210,11211}, "couchbase-tap", "tcp")
local arg_bucketname = stdnse.get_script_args(SCRIPT_NAME..".bucketname")
Driver = {
new = function(self, host, port, options)
local o = { host = host, port = port, options = options }
setmetatable(o, self)
self.__index = self
return o
end,
connect = function(self)
self.helper = membase.Helper:new(self.host, self.port)
return self.helper:connect(brute.new_socket())
end,
login = function(self, username, password)
local status, response = self.helper:login(arg_bucketname or username, password)
if ( not(status) and "Auth failure" == response ) then
return false, brute.Error:new( "Incorrect password" )
elseif ( not(status) ) then
local err = brute.Error:new( response )
err:setRetry( true )
return false, err
end
return true, creds.Account:new( arg_bucketname or username, password, creds.State.VALID)
end,
disconnect = function(self)
return self.helper:close()
end
}
local function fail(err) return stdnse.format_output(false, err) end
local function getMechs(host, port)
local helper = membase.Helper:new(host, port)
local status, err = helper:connect()
if ( not(status) ) then
return false, "Failed to connect to server"
end
local status, response = helper:getSASLMechList()
if ( not(status) ) then
stdnse.debug2("Received unexpected response: %s", response)
return false, "Received unexpected response"
end
helper:close()
return true, response.mechs
end
action = function(host, port)
local status, mechs = getMechs(host, port)
if ( not(status) ) then
return fail(mechs)
end
if ( not(mechs:match("PLAIN") ) ) then
return fail("Unsupported SASL mechanism")
end
local result
local engine = brute.Engine:new(Driver, host, port )
engine.options.script_name = SCRIPT_NAME
engine.options.firstonly = true
if ( arg_bucketname ) then
engine.options:setOption( "passonly", true )
end
status, result = engine:start()
return result
end
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