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Run ventrilo-info only once for TCP and UDP.
Patch by Marin Maržić. http://seclists.org/nmap-dev/2013/q2/413.
This commit is contained in:
david
@@ -31,7 +31,6 @@ Original reversing of the protocol was done by Luigi Auriemma
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(http://aluigi.altervista.org/papers.htm#ventrilo).
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]]
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---
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-- @usage
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-- nmap -sV <target>
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-- @usage
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@@ -151,7 +150,7 @@ Original reversing of the protocol was done by Luigi Auriemma
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-- <elem>COMM</elem>
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-- </table>
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author = "Marin Marzic"
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author = "Marin Maržić"
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license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
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categories = { "default", "discovery", "safe", "version" }
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@@ -313,11 +312,11 @@ local dec_data = function(str, len, key)
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-- skip the header (first 20 bytes)
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local data = { string.byte(str, 21, 20 + len) }
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local a1 = bit.band(key, 0xFF)
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a1 = bit.band(key, 0xFF)
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if a1 == 0 then
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return table.concat(data)
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end
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local a2 = bit.rshift(key, 8)
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a2 = bit.rshift(key, 8)
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for i = 1,len do
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data[i] = bit.band(data[i] - (crypt_data[a2 + 1] + ((i - 1) % 72)), 0xFF)
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@@ -343,7 +342,7 @@ end
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-- Calculates the CRC checksum used for checking the integrity of the received
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-- status response data segment.
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-- @param data data to calculate the checksum of
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-- @return 2byte CRC checksum as seen in Ventrilo UDP status response headers
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-- @return 2 byte CRC checksum as seen in Ventrilo UDP status headers
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local crc = function(data)
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local sum = 0
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for i = 1,#data do
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@@ -525,20 +524,30 @@ end
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portrule = shortport.version_port_or_service({3784}, "ventrilo", {"tcp", "udp"})
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action = function(host, port)
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local mutex = nmap.mutex("ventrilo-info:" .. host.ip .. ":" .. port.number)
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mutex("lock")
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if host.registry["ventrilo-info"] == nil then
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host.registry["ventrilo-info"] = {}
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end
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-- Maybe the script already ran for this port number on another protocol
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local r = host.registry["ventrilo-info"][port.number]
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if r == nil then
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r = {}
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host.registry["ventrilo-info"][port.number] = r
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local socket = nmap.new_socket()
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socket:set_timeout(2000)
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local catch = function()
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local cleanup = function()
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socket:close()
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mutex("done")
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end
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local try = nmap.new_try(catch)
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local try = nmap.new_try(cleanup)
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try(socket:connect(host.ip, port.number, "udp"))
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local udpport = { number = port.number, protocol = "udp" }
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try(socket:connect(host.ip, udpport))
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local fulldata = {}
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local curlen = 0
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local head_crc_sum
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repeat
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local status, response
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-- try a couple of times on timeout, the service seems to not
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-- respond if multiple requests come within a short timeframe
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@@ -546,37 +555,71 @@ action = function(host, port)
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try(socket:send(static_probe_payload))
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status, response = socket:receive()
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if status then
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if port.protocol == "udp" then
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nmap.set_port_state(host, port, "open")
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end
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nmap.set_port_state(host, udpport, "open")
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break
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end
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end
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if not status then
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-- 3 timeouts, no response
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cleanup()
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return
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end
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-- received the first packet, process it and others if they come
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local fulldata = {}
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local fulldatalen = 0
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local curlen = 0
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local head_crc_sum
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while true do
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-- decrypt received header and extract relevant information
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local id, len, totlen, pck, totpck, key, crc_sum = dec_head(response)
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head_crc_sum = crc_sum
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if id == static_probe_id then
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curlen = curlen + len
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head_crc_sum = crc_sum
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-- check for an invalid response
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if #response < 20 or pck >= totpck or
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len > 492 or curlen > totlen then
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stdnse.print_debug("Invalid response, aborting script.")
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stdnse.print_debug("Invalid response. Aborting script.")
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cleanup()
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return
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end
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-- keep track of the length of fulldata (# isn't applicable)
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if fulldata[pck + 1] == nil then
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fulldatalen = fulldatalen + 1
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end
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-- accumulate UDP packets that may not necessarily come in proper
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-- order; arrange them by packet id
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fulldata[pck + 1] = dec_data(response, len, key)
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end
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until #fulldata == totpck and curlen == totlen
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-- check for invalid states in communication
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if (fulldatalen > totpck) or (curlen > totlen)
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or (fulldatalen == totpck and curlen ~= totlen)
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or (curlen == totlen and fulldatalen ~= totpck) then
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stdnse.print_debug("Invalid state (fulldatalen = " .. fulldatalen ..
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"; totpck = " .. totpck .. "; curlen = " .. curlen ..
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"; totlen = " .. totlen .. "). Aborting script.")
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cleanup()
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return
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end
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-- check for valid end of communication
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if fulldatalen == totpck and curlen == totlen then
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break
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end
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-- receive another packet
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status, response = socket:receive()
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if not status then
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stdnse.print_debug("Response packets stopped coming midway. Aborting script.")
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cleanup()
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return
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end
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end
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socket:close()
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-- concatenate received data into a single string for further use
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@@ -586,28 +629,37 @@ action = function(host, port)
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local fulldata_crc_sum = crc(fulldata_str)
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if fulldata_crc_sum ~= head_crc_sum then
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stdnse.print_debug("Invalid CRC sum, received = %04X, calculated = %04X", head_crc_sum, fulldata_crc_sum)
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cleanup()
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return
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end
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-- parse the received data string into an output table
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local info = o_table(fulldata_str)
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r.info = o_table(fulldata_str)
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end
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mutex("done")
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-- If the registry is empty the port was probed but Ventrilo wasn't detected
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if next(r) == nil then
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return
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end
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port.version.name = "ventrilo"
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port.version.name_confidence = 10
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port.version.product = "Ventrilo"
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port.version.version = info.version
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port.version.ostype = info.platform
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port.version.extrainfo = "; name: ".. info.name
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port.version.version = r.info.version
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port.version.ostype = r.info.platform
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port.version.extrainfo = "; name: ".. r.info.name
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if port.protocol == "tcp" then
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port.version.extrainfo = "voice port" .. port.version.extrainfo
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else
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port.version.extrainfo = "status port" .. port.version.extrainfo
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end
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port.version.extrainfo = port.version.extrainfo .. "; uptime: " .. uptime_str(info.uptime)
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port.version.extrainfo = port.version.extrainfo .. "; auth: " .. auth_str(info.auth)
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port.version.extrainfo = port.version.extrainfo .. "; uptime: " .. uptime_str(r.info.uptime)
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port.version.extrainfo = port.version.extrainfo .. "; auth: " .. auth_str(r.info.auth)
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nmap.set_port_version(host, port, "hardmatched")
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-- an output table for XML output and a custom string for normal output
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return info, o_str(info)
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return r.info, o_str(r.info)
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end
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