mirror of
https://github.com/nmap/nmap.git
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79 lines
2.4 KiB
Lua
79 lines
2.4 KiB
Lua
description=[[
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Checks if an HTTP proxy is open.
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The script attempts to connect to www.google.com through the (possible) proxy and checks
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for a <code>Server: gws</code> header field in the response.
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If the target is an open proxy, this script causes the target to retrieve a
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web page from www.google.com.
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]]
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-- Arturo 'Buanzo' Busleiman <buanzo@buanzo.com.ar> / www.buanzo.com.ar / linux-consulting.buanzo.com.ar
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-- Changelog: Added explode() function. Header-only matching now works.
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-- * Fixed set_timeout
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-- * Fixed some \r\n's
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-- 2008-10-02 Vlatko Kosturjak <kost@linux.hr>
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-- * Match case-insensitively against "^Server: gws" rather than
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-- case-sensitively against "^Server: GWS/".
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author = "Arturo 'Buanzo' Busleiman <buanzo@buanzo.com.ar>"
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license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
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categories = {"default", "discovery", "external", "intrusive"}
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require "comm"
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require "shortport"
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--- An explode function for NSE/LUA. Taken (and fixed) from http://lua-users.org/wiki/LuaRecipes
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--@param d Delimiter
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--@param p Buffer to explode
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--@return A LUA Table
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function explode(d,p)
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local t,ll,l
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t={}
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ll=0
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while true do
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l=string.find(p,d,ll+1,true) -- find the next d in the string
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if l~=nil then -- if "not not" found then..
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table.insert(t, string.sub(p,ll,l-1)) -- Save it in our array.
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ll=l+1 -- save just after where we found it for searching next time.
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else
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table.insert(t, string.sub(p,ll)) -- Save what's left in our array.
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break -- Break at end, as it should be, according to the lua manual.
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end
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end
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return t
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end
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portrule = shortport.port_or_service({3128,8000,8080},{'squid-http','http-proxy'})
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action = function(host, port)
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local response
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local i
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-- We will return this if we don't find "^Server: gws" in response headers
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local retval
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-- Ask proxy to open www.google.com
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local req = "GET http://www.google.com HTTP/1.0\r\nHost: www.google.com\r\n\r\n"
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local status, result = comm.exchange(host, port, req, {lines=1,proto=port.protocol, timeout=10000})
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if not status then
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return
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end
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-- Explode result into the response table
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response = explode("\n",result)
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-- Now, search for "Server: gws" until headers (or table) end.
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i = 0
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while true do
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i = i+1
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if i > table.getn(response) then break end
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if response[i]=="\r" then break end
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if string.match(response[i]:lower(),"^server: gws") then
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retval = "Potentially OPEN proxy. Google\'s \"Server: gws\" header FOUND."
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break
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end
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end
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return retval
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end
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