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local brute = require "brute"
local creds = require "creds"
local shortport = require "shortport"
local stdnse = require "stdnse"
local rsync = stdnse.silent_require "rsync"
description = [[
Performs brute force password auditing against the rsync remote file syncing protocol.
]]
---
-- @usage
-- nmap -p 873 --script rsync-brute --script-args 'rsync-brute.module=www' <ip>
--
-- @output
-- PORT STATE SERVICE REASON
-- 873/tcp open rsync syn-ack
-- | rsync-brute:
-- | Accounts
-- | user1:laptop - Valid credentials
-- | user2:password - Valid credentials
-- | Statistics
-- |_ Performed 1954 guesses in 20 seconds, average tps: 97
--
-- @args rsync-brute.module - the module against which brute forcing should be performed
author = "Patrik Karlsson"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"brute", "intrusive"}
portrule = shortport.port_or_service(873, "rsync", "tcp")
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 = rsync.Helper:new(self.host, self.port, self.options)
return self.helper:connect(brute.new_socket())
end,
login = function(self, username, password)
local status, data = self.helper:login(username, password)
-- retry unless we have an authentication failed error
if( not(status) and data ~= "Authentication failed" ) then
local err = brute.Error:new( data )
err:setRetry( true )
return false, err
elseif ( not(status) ) then
return false, brute.Error:new( "Login failed" )
else
return true, creds.Account:new(username, password, creds.State.VALID)
end
end,
disconnect = function( self )
return self.helper:disconnect()
end
}
local function isModuleValid(host, port, module)
local helper = rsync.Helper:new(host, port, { module = module })
if ( not(helper) ) then
return false, "Failed to create helper"
end
local status, data = helper:connect()
if ( not(status) ) then
return false, "Failed to connect to server"
end
status, data = helper:login()
if ( status and data == "No authentication was required" ) then
return false, data
elseif ( not(status) and data == "Authentication required" ) then
return true
elseif ( not(status) and data == ("Unknown module '%s'"):format(module) ) then
return false, data
end
return false, ("Brute pre-check failed for unknown reason: (%s)"):format(data)
end
local function fail (err) return stdnse.format_output(false, err) end
action = function(host, port)
local mod = stdnse.get_script_args(SCRIPT_NAME .. ".module")
if ( not(mod) ) then
return fail("rsync-brute.module was not supplied")
end
local status, err = isModuleValid(host, port, mod)
if ( not(status) ) then
return fail(err)
end
local engine = brute.Engine:new(Driver, host, port, { module = mod })
engine.options.script_name = SCRIPT_NAME
local result
status, result = engine:start()
return result
end
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