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75 lines
2.2 KiB
Lua
75 lines
2.2 KiB
Lua
description = [[
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Retrieves the authentication scheme and realm of a web service that requires
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authentication.
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]]
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---
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-- @output
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-- 80/tcp open http
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-- | http-auth: HTTP Service requires authentication
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-- | Auth type: Basic, realm = Password Required
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-- |_ HTTP server may accept admin:admin combination for Basic authentication
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-- HTTP authentication information gathering script
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-- rev 1.1 (2007-05-25)
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-- 2008-11-06 Vlatko Kosturjak <kost@linux.hr>
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-- * bug fixes against base64 encoded strings, more flexible auth/pass check,
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-- corrected sample output
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author = "Thomas Buchanan <tbuchanan@thecompassgrp.net>"
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license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
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categories = {"default", "auth", "intrusive"}
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require "shortport"
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require "http"
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require "base64"
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portrule = shortport.port_or_service({80, 443, 8080}, {"http","https"})
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action = function(host, port)
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local realm,scheme,result,authheader
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local basic = false
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local authcombinations= {"admin:", "admin:admin"}
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local answer = http.get( host, port, "/" )
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--- check for 401 response code
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if answer.status == 401 then
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result = "HTTP Service requires authentication\n"
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-- split www-authenticate header
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local auth_headers = {}
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local pcre = pcre.new('\\w+( (\\w+=("[^"]+"|\\w+), *)*(\\w+=("[^"]+"|\\w+)))?',0,"C")
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local match = function( match ) table.insert(auth_headers, match) end
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pcre:gmatch( answer.header['www-authenticate'], match )
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for _, value in pairs( auth_headers ) do
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result = result .. " Auth type: "
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scheme, realm = string.match(value, "(%a+).-[Rr]ealm=\"(.-)\"")
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if scheme == "Basic" then
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basic = true
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end
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if realm ~= nil then
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result = result .. scheme .. ", realm = " .. realm .. "\n"
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else
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result = result .. string.match(value, "(%a+)") .. "\n"
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end
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end
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end
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if basic then
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for _, combination in pairs (authcombinations) do
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authheader = "Basic " .. base64.enc(combination)
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answer = http.get(host, port, '/', {header={Authorization=authheader}})
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if answer.status ~= 401 and answer.status ~= 403 then
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result = result .. " HTTP server may accept " .. combination .. " combination for Basic authentication\n"
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end
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end
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end
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return result
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end
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