Security Basic
 

Hello,
The 1st year on linux for me. I have setup a linux -Redhat server
I need to learn about security now, I had already used sshd connection , disable root remote login, and what else should I do?

thx for sharing knowledge between linux community

For a good general security discussion I'd suggest you read O'Reillys Practicle Intenet and Unix security although its a little dated now, I imagine a newer version will be out soon. That will give you a good general overview of the basics. Then you'll need to start generally reading as much security/cracking related material you can...

cheers

Jamie...

as soon as you set up redhat ,
edit /etc/sysconfig/sendmail and set daemon to no and queue to 15m.
this will stop sendmail listening in daemon mode. do this unless you want to provide smtp service to users. if you are going to provide smtp to your lan you have to comment out a line in /etc/mail/sendmail.mc and rrun m4.
the instructions are there in the sendmail.mc file

Check out the Securing and Optimizing Linux Guide at Linuxdoc.org. It's a great first look at Linux in the server world.

All the best and enjoy your adventures

penseur2