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-rw-r--r--scripts/rfc868-time.nse65
1 files changed, 65 insertions, 0 deletions
diff --git a/scripts/rfc868-time.nse b/scripts/rfc868-time.nse
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+local comm = require "comm"
+local datetime = require "datetime"
+local shortport = require "shortport"
+local stdnse = require "stdnse"
+local string = require "string"
+local stringaux = require "stringaux"
+local nmap = require "nmap"
+local os = require "os"
+
+description = [[
+Retrieves the day and time from the Time service.
+]]
+
+---
+-- @output
+-- PORT STATE SERVICE
+-- 37/tcp open time
+-- |_rfc868-time: 2013-10-23T10:33:00
+
+author = "Daniel Miller"
+
+license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
+
+categories = {"discovery", "safe", "version"}
+
+
+portrule = shortport.version_port_or_service(37, "time", {"tcp", "udp"})
+
+action = function(host, port)
+ local status, result = comm.exchange(host, port, "", {bytes=4})
+
+ if status then
+ local stamp
+ local width = #result
+ if width == 4 then
+ stamp = string.unpack(">I4", result)
+ port.version.extrainfo = "32 bits"
+ elseif width == 8 then
+ stamp = string.unpack(">I4", result)
+ port.version.extrainfo = "64 bits"
+ else
+ stdnse.debug1("Odd response: %s", stringaux.filename_escape(result))
+ return nil
+ end
+
+ -- RFC 868 epoch is Jan 1, 1900
+ stamp = stamp - 2208988800
+
+ -- Make sure we don't stomp a more-likely service detection.
+ if port.version.name == "time" then
+ local recvtime = os.time()
+ local diff = os.difftime(stamp,recvtime)
+ if diff < 0 then diff = -diff end
+ -- confidence decreases by 1 for each year the time is off.
+ stdnse.debug1("Time difference: %d seconds (%0.2f years)", diff, diff / 31556926)
+ local confidence = 10 - diff / 31556926
+ if confidence < 0 then confidence = 0 end
+ datetime.record_skew(host, stamp, recvtime)
+ port.version.name_confidence = confidence
+ nmap.set_port_version(host, port, "hardmatched")
+ end
+
+ return datetime.format_timestamp(stamp)
+ end
+end