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- This version of IRCII supports the use of privileged ports. A modified
- server which only accepts connections from clients whose port number is
- below 1024 can use this to ensure the integrity of the user name field
- from the user@host pair.
-
- The procedure for installing IRCII for privileged ports is slightly
- different. First, you should uncomment the PP_OBJS and PP_DEFS macros
- in Makefile. Then touch config.h and make. The value for PRIV_PORT
- specified in PP_DEFS is the lower bound port IRCII should try to use.
- In practice this value is unlikely to matter, provided it is below 1000.
-
- If your system has the saved UID feature, you can use a more secure
- version of the privileged port code. See test-suid.c and Makefile for
- details on this.
-
- Once you have made IRCII, and installed it, you will need to do one of
- two things:
-
- 1) If you are using ircserv, make the ircserv program owned by
- root, with a secure group ID. For example, you could create
- the group ID irc, and have ircserv's group be irc.
-
- Change the mode of ircserv so that nobody other than a member
- of that group (or root) can execute it. Then make irc setgid
- to that group.
-
- eg: chown root.irc ircserv
- chmod 4710 ircserv
- chgrp irc irc
- chmod 2711 irc
-
- If there is a chance that users may be unable to execute the
- ircserv process due to processes being exhausted, you can make
- irc setuid->root too.
-
- 2) If you are not using ircserv, you will need to install irc
- setuid->root.
-
- eg: chown root irc
- chmod 4711 irc
-
- Note: The Implementation with the ircserv process can be proven to be
- secure trivially. This is not the case with the non ircserv
- version, although the potential waeknesses have been carefully
- analysed, and to the best of my knowledge, none exist.
-