Yesterday, my friend's server got cracked. The cracker planted Rootedoor Trojan on his server and deleted quite some important files from the system. Now he is crazy for finding out other abnormal and recovering everything.
I began to worry about my own gentoo box. Basically, I am a layman of linux so far. I am running Apache, openssh, postfix and mysql service here. I don't know a little about system security. Now I'd like to begin to learn something and do something to protect myself. Where should I begin from? What should I do to secure my system? MF -- Life sucks, but we can change it.
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