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81 lines
2.4 KiB
Lua
81 lines
2.4 KiB
Lua
-- Arturo 'Buanzo' Busleiman <buanzo@buanzo.com.ar> / www.buanzo.com.ar / linux-consulting.buanzo.com.ar
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-- See Nmap'ss COPYING file for licence details
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-- This is version 20070413 aka "13th Friday" :)
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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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id="Open Proxy Test"
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description="Test if a discovered proxy is open to us by connecting to www.google.com and checking for the 'Server: GWS/' header response."
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tags = {"intrusive"}
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-- I found a nice explode() function in lua-users' wiki. I had to fix it, though.
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-- http://lua-users.org/wiki/LuaRecipes
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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 = function(host, port)
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if (port.number == 3128 or port.number == 8080 or port.service == "http-proxy" or port.service == "squid-proxy" or port.service == "squid-proxy?")
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and port.protocol == "tcp"
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then
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return true
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else
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return false
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end
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end
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action = function(host, port)
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local socket = nmap.new_socket()
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local result
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local status = true
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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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socket:set_timeout(10000);
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socket:connect(host.ip, port.number, port.protocol)
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-- Ask proxy to open www.google.com
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socket:send("GET http://www.google.com HTTP/1.0\r\nHost: www.google.com\r\n\r\n")
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-- read the response, if any
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status, result = socket:receive_lines(1)
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-- Explode result into the response table
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if (status == false) or (result == "TIMEOUT") then
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else
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response = explode("\n",result)
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end
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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],"^Server: GWS/") then
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retval = "Potentially OPEN proxy. Check for 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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-- close the socket and exit, returning the retval string.
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socket:close()
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return retval
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end
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