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102 lines
2.4 KiB
Lua
102 lines
2.4 KiB
Lua
--- Sends and HTTP TRACE and describes any modifications
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--
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--@output
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-- 80/tcp open http \n
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-- | HTTP TRACE: Response differs from request. First 5 additional lines: \n
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-- | Cookie: UID=d4287aa38d02f409841b4e0c0050c13148a85d01c0c0a154d4ef56dfc2b4fc1b0 \n
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-- | Country: us \n
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-- | Ip_is_advertise_combined: yes \n
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-- | Ip_conntype-Confidence: -1 \n
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-- |_ Ip_line_speed: medium
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-- 08/31/2007
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id = "HTTP TRACE"
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description = "Send HTTP TRACE method and print modifications"
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author = "Kris Katterjohn <katterjohn@gmail.com>"
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license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
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categories = {"discovery"}
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require "comm"
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require "shortport"
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require "stdnse"
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--- Truncates and formats the first 5 elements of a table
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--@param tab The table to truncate
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--@return Truncated, formatted table
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local truncate = function(tab)
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local str = ""
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str = str .. tab[1] .. "\n"
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str = str .. tab[2] .. "\n"
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str = str .. tab[3] .. "\n"
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str = str .. tab[4] .. "\n"
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str = str .. tab[5] .. "\n"
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return str
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end
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--- Validates the HTTP response and checks for modifications
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--@param response The HTTP response from the server
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--@param original The original HTTP request sent to the server
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--@return A string describing the changes (if any) between the response and
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-- request
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local validate = function(response, original)
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local start, stop
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local body
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if not response:match("HTTP/1.[01] 200") or
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not response:match("TRACE / HTTP/1.0") then
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return
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end
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start, stop = response:find("\r\n\r\n")
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body = response:sub(stop + 1)
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if original ~= body then
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local output = "Response differs from request. "
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if body:match("^TRACE / HTTP/1.0\r\n") then
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local extra = body:sub(19) -- skip TRACE line
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local tab = {}
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-- Skip extra newline at the end (making sure it's there)
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extra = extra:gsub("\r\n\r\n$", "\r\n")
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tab = stdnse.strsplit("\r\n", extra)
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if #tab > 5 then
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output = output .. "First 5 additional lines:\n"
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return output .. truncate(tab)
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end
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output = output .. "Additional lines:\n"
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return output .. extra .. "\n"
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end
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-- This shouldn't happen
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output = output .. "Full response:\n"
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return output .. body .. "\n"
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end
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return
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end
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portrule = shortport.port_or_service({80, 8080}, "http")
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action = function(host, port)
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local cmd = "TRACE / HTTP/1.0\r\n\r\n"
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local status, response = comm.exchange(host, port, cmd, {lines=1,timeout=5000})
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if not status then
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return
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end
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return validate(response, cmd)
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end
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