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6139ed22e7
In most cases (e.g. any of the nmap.socket operations), functions can take full host and port tables instead of just host.ip and port.number. This makes for cleaner-looking code and easier extensibility if we decide to check for a protocol on both TCP and UDP, for instance.
147 lines
3.6 KiB
Lua
147 lines
3.6 KiB
Lua
local brute = require "brute"
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local creds = require "creds"
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local shortport = require "shortport"
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local stdnse = require "stdnse"
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local vnc = require "vnc"
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description = [[
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Performs brute force password auditing against VNC servers.
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]]
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---
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-- @usage
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-- nmap --script vnc-brute -p 5900 <host>
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--
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-- @output
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-- PORT STATE SERVICE REASON
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-- 5900/tcp open vnc syn-ack
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-- | vnc-brute:
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-- | Accounts
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-- |_ 123456 => Valid credentials
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--
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-- Summary
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-- -------
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-- x The Driver class contains the driver implementation used by the brute
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-- library
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--
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--
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--
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-- Version 0.1
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-- Created 07/12/2010 - v0.1 - created by Patrik Karlsson <patrik@cqure.net>
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--
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author = "Patrik Karlsson"
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license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
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categories = {"intrusive", "brute"}
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portrule = shortport.port_or_service(5901, "vnc", "tcp", "open")
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Driver =
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{
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new = function(self, host, port)
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local o = {}
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setmetatable(o, self)
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self.__index = self
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o.host = host
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o.port = port
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return o
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end,
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connect = function( self )
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local status, data
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self.vnc = vnc.VNC:new( self.host, self.port )
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status, data = self.vnc:connect()
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if ( not(status) ) then
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local err = brute.Error:new( "VNC connect failed" )
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-- This might be temporary, set the retry flag
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err:setRetry( true )
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return false, err
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end
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return true
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end,
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--- Attempts to login to the VNC server
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--
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-- @param username string containing the login username
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-- @param password string containing the login password
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-- @return status, true on success, false on failure
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-- @return brute.Error object on failure
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-- creds.Account object on success
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login = function( self, username, password )
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local status, data = self.vnc:handshake()
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if ( not(status) and ( data:match("Too many authentication failures") or
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data:match("Your connection has been rejected.") ) ) then
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local err = brute.Error:new( data )
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err:setAbort( true )
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return false, err
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elseif ( not(status) ) then
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local err = brute.Error:new( "VNC handshake failed" )
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-- This might be temporary, set the retry flag
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err:setRetry( true )
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return false, err
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end
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status, data = self.vnc:login( nil, password )
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if ( status ) then
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return true, creds.Account:new("", password, creds.State.VALID)
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elseif ( not( data:match("Authentication failed") ) ) then
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local err = brute.Error:new( data )
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-- This might be temporary, set the retry flag
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err:setRetry( true )
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return false, err
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end
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return false, brute.Error:new( "Incorrect password" )
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end,
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disconnect = function( self )
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self.vnc:disconnect()
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end,
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check = function( self )
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local vnc = vnc.VNC:new( self.host, self.port )
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local status, data
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status, data = vnc:connect()
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if ( not(status) ) then
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return stdnse.format_output( false, data )
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end
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status, data = vnc:handshake()
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if ( not(status) ) then
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return stdnse.format_output( false, data )
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end
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if ( vnc:supportsSecType(vnc.sectypes.NONE) ) then
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return false, "No authentication required"
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end
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status, data = vnc:login( nil, "is_sec_mec_supported?" )
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if ( data:match("The server does not support.*security type") ) then
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return stdnse.format_output( false, " \n " .. data )
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end
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return true
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end,
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}
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action = function(host, port)
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local status, result
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local engine = brute.Engine:new(Driver, host, port )
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engine.options.script_name = SCRIPT_NAME
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engine.options.firstonly = true
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engine.options:setOption( "passonly", true )
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status, result = engine:start()
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return result
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end
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