SUMMARY: Disabling logins except for specific IPs

I asked essentially:

> What I'm basically looking for is a set of lines (in all files necessary to completely secure the machine) that, in human readable code, says "Allow logins from the following IP addresses only, via terminal, SSH, and everything else: xxx.xxx.xx.xx" for an OSF1 machine.

The answer was to install TCP Wrappers, which can be found at
ftp://ftp.porcupine.org/pub/security/tcp_wrappers_7.6.tar.gz.
Oisin McGuinness recommends the following, as well:
"You then have an extra executable (say tcpd, which say you put
in /usr/local/bin/tcpd). Then change every remote login service line
in /etc/inetd.conf
so that tcpd is invoked 1st, and then it runs the actual program.

E.g., if you are using ssh from inetd.conf

ssh     stream  tcp     nowait  root    /usr/local/bin/tcpd   sshd -i

The access is controlled by two files
/etc/hosts.allow
/etc/hosts.deny

Simplest to have /etc/hosts.deny to deny all access to all services:
ALL: ALL
as contents, then for each service you want to allow selective access to
have a line in /etc/hosts.allow, for example:

sshd: LOCAL

will allow sshd to be started for connections from locally connected
(within same
network) machines."

Thanks to all who contributed so quickly:
Oisin McGuinness
A. Mahendra Rajah
Chris Eubanks
Graham Allan
Michael Bucholtz


-Ashwin Purohit
> Thanks,
> Ashwin Purohit
> [email protected]
>


-- 
Ashwin Purohit

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