[linux-help] Help with hackers

["Adam M. Sennott" <kryste01@xxxxxxx>]

Hello, Linux users.

As I mentioned in a previous post, I am currently involved in a lab
situation with several other RedHat 6.2 Linux users.  Each of us has an
individual server, and we are on a private network 172.16.xxx.xxx with
numerically consecutive IP address.

Some advanced students have access to our PCs, and have been encouraged to
try to hack, in order to provide us with lessons in security.

Being that the only current account is root, and we have configured the
'linux single' bootup to require a password *and* protected the
configuration file lilo.conf with 'chmod 640 lilo.conf' we are relatively
safe from one another.  Not even the advanced students know enough about the
OS to telnet in and really do any damage (besides, the only time the
machines are on and live is when we're sitting at them, or another student
is trying to break in.)

But I digress.  My question is, is there any way I could place a echo
statement somewhere in a file so that someone failing to log in correctly as
root, or as linux single would receive a nasty little message?  And better
yet, is there a way for me to log the failed attempts, as they will likely
take place when I'm at lunch or gone home for the day?

If anyone would care to answer, or elaborate on how I might provide
additional security, please advise.

Thanks in advance,


Adam S.

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