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Full Discussion: closing open ports
Special Forums Cybersecurity closing open ports Post 7557 by loadc on Thursday 27th of September 2001 06:12:43 PM
Old 09-27-2001
One last thing----

Just one last little bit, your inetd.conf file is a better reference for what is running on the box, under inetd,(not to mention the use of lsof and looking at /etc/services) than an nmap scan. nmap is guessing at what is running on what port from a list of what is assumed to be a known service on those ports, usually anything above port 1024 (and sometimes, below it) is arbitrarily set to serve from that port. BackOrifice and NetBus could be config'd to run from other ports, so can netcat and other such tools. Your best bet is stripping down to only what you need, and keeping a sharp eye out for any new servers being put out there. You can use lsof to get an idea (okay, see what's happening) of exactly what proc is using which port so you can see who is serving what out of your box.
The nmap scans are excellent for finding servers that are nto running under inetd's auspices. Sounds like you're going in the right direction....


Later,


loadc
 

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HUNTD(6)							 BSD Games Manual							  HUNTD(6)

NAME
huntd -- hunt daemon, back-end for hunt game SYNOPSIS
huntd [-s] [-p port] DESCRIPTION
huntd controls the multi-player hunt(6) game. When it starts up, it tries to notify all members of the hunt-players mailing list (see sendmail(8)) by faking a talk(1) request from user ``Hunt Game''. The -s option is for running huntd forever (server mode). This is similar to running it under the control of inetd(8) (see below), but it consumes a process table entry when no one is playing. The -p option changes the UDP port number used to rendezvous with the player process and thus allows for private games of hunt. This option turns off the notification of players on the hunt-players mailing list. INETD To run huntd from inetd(8), you'll need to put the hunt service in /etc/services: hunt 26740/udp # multi-player/multi-host mazewars and add the following line to /etc/inetd.conf: hunt dgram udp wait nobody /usr/games/huntd huntd Do not use any of the command line options; if you want inetd(8) to start up huntd on a private port, change the port listed for hunt in /etc/services. NETWORK RENDEZVOUS
When hunt(6) starts up, it broadcasts on the local area net (using the broadcast address for each interface) to find a hunt game in progress. If a huntd hears the request, it sends back the port number for the hunt process to connect to. Otherwise, the hunt process starts up a huntd on the local machine and tries to rendezvous with it. SEE ALSO
talk(1), hunt(6), sendmail(8) AUTHORS
Conrad Huang, Ken Arnold, and Greg Couch; University of California, San Francisco, Computer Graphics Lab April 4, 2001
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