116 lines
3.4 KiB
Lua
116 lines
3.4 KiB
Lua
local base64 = require "base64"
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local brute = require "brute"
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local creds = require "creds"
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local http = require "http"
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local shortport = require "shortport"
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local stdnse = require "stdnse"
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description = [[
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Performs brute force password guessing against HTTP proxy servers.
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]]
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---
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-- @usage
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-- nmap --script http-proxy-brute -p 8080 <host>
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--
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-- @output
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-- PORT STATE SERVICE
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-- 8080/tcp open http-proxy
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-- | http-proxy-brute:
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-- | Accounts
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-- | patrik:12345 - Valid credentials
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-- | Statistics
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-- |_ Performed 6 guesses in 2 seconds, average tps: 3
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--
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-- @args http-proxy-brute.url sets an alternative URL to use when brute forcing
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-- (default: http://scanme.insecure.org)
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-- @args http-proxy-brute.method changes the HTTP method to use when performing
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-- brute force guessing (default: HEAD)
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author = "Patrik Karlsson"
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license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
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-- maybe the script does not need to be in the external category
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-- as most request should not "leave" the proxy.
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categories = {"brute", "intrusive", "external"}
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portrule = shortport.port_or_service({8123,3128,8000,8080},{'polipo','squid-http','http-proxy'})
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local arg_url = stdnse.get_script_args(SCRIPT_NAME .. '.url') or 'http://scanme.nmap.org/'
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local arg_method = stdnse.get_script_args(SCRIPT_NAME .. '.method') or "HEAD"
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Driver = {
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new = function(self, host, port)
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local o = { host = host, port = port }
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setmetatable(o, self)
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self.__index = self
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return o
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end,
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connect = function( self )
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return true
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end,
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login = function( self, username, password )
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-- the http library does not yet support proxy authentication, so let's
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-- do what's necessary here.
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local header = { ["Proxy-Authorization"] = "Basic " .. base64.enc(username .. ":" .. password) }
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local response = http.generic_request(self.host, self.port, arg_method, arg_url, { header = header, bypass_cache = true } )
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-- if we didn't get a 407 error, assume the credentials
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-- were correct. we should probably do some more checks here
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if ( response.status ~= 407 ) then
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return true, creds.Account:new( username, password, creds.State.VALID)
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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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return true
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end,
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}
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-- checks whether the proxy really needs authentication and that the
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-- authentication mechanism can be handled by our script, currently only
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-- BASIC authentication is supported.
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local function checkProxy(host, port, url)
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local response = http.generic_request(host, port, arg_method, url, { bypass_cache = true })
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if ( response.status ~= 407 ) then
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return false, "Proxy server did not require authentication"
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end
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local proxy_auth = response.header["proxy-authenticate"]
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if ( not(proxy_auth) ) then
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return false, "No proxy authentication header was found"
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end
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local challenges = http.parse_www_authenticate(proxy_auth)
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for _, challenge in ipairs(challenges) do
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if ( "Basic" == challenge.scheme ) then
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return true
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end
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end
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return false, "The authentication scheme wasn't supported"
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end
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action = function(host, port)
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local status, err = checkProxy(host, port, arg_url)
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if ( not(status) ) then
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return stdnse.format_output(false, err)
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end
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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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local result
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status, result = engine:start()
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return result
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end
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