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slicktux
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PostPosted: Tue Jul 16, 2013 5:16 am    Post subject: Maintaining A Secure Linux System? Reply with quote

i am making Gentoo my primary OS for my laptop, and i want to know how to keep my system secure as well as my data. i know that keeping system up to date is clearly one of them as well as not using root unless necessary. and that is all i can think of or should i say know, so is that all it takes to keep Linux system secure?

recommendations,repercussions and suggestions are greatly appreciated.
Thank You
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The Doctor
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PostPosted: Tue Jul 16, 2013 6:05 am    Post subject: Reply with quote

Welcome to Gentoo!

Secure against what? Stolen Laptop? Hacking? Water boarding the user to give up the password*?

If secure against theft is a priority, I would use a complete disk encryption scheme. I would use serpent since it appears to be the most secure cypher for the job.

In addition to keeping your system up to date, you should also make it a point to disable possible security holes. For example, you should configure ssh to never allow root log ins and you should probably restrict it to public key authentication rather than password. If you don't need ssh running, don't even add it to your default run level.

Use flags are another powerful tool. For example, if you don't need policykit, consolkit, pam etc, why install them at all? All they would be doing in that case is adding a possible security hole. Just in time (jit) is another risk. Compiling code as you need it is handy for java, etc but it leaves the possibility of malicious code being introduced.

Your kernel is another area to pay attention to. Just use what you need. If you don't need loadable module support, disable it and don't build any modules. This is because you (or your kernel) could be tricked into running a tainted module. Also, choose your kernel carefully. Hardened-sources has many security features, such as PaX.

You should also run a strong firewall such as iptables. You should set your rules to be on the conservative side, etc.

Of course, if you are just an average user then simply keeping up to date, running a firewall, and exercising good Internet safety should be adequate. I am sure other people will have suggestions, but without knowing exactly what kind of security you are thinking of, its hard to give any kind of answer.

* If your data is worth your life, you would be stupid to rely on any information online.
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PaulBredbury
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PostPosted: Tue Jul 16, 2013 11:59 am    Post subject: Reply with quote

Use e.g. AppArmor on the Internet-facing apps (web browser, email, etc) and proprietary apps.

Use privoxy to filter ads etc. for your web browser.
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slicktux
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PostPosted: Thu Jul 18, 2013 2:54 am    Post subject: reply Reply with quote

The Doctor wrote:
Welcome to Gentoo!

Secure against what? Stolen Laptop? Hacking? Water boarding the user to give up the password*?


Thank you for thee informative answer for such a broad question.
"i don't see myself being water boarded in my life time "knocks on wood". :)"

secure against hacking is my main concern,whether it's from a virus or a malicious network culprit. It would be ignorant to say "GnuLinux OS's" or any "OS" is immune to Viruses,Worms and Network Attacks. as a new user to Linux i want to educate myself as much as possible by learning the In's&Out's of this wonderful OS. Doc with the info you have given me i will start this one of many, voyage of education. i will call it "Security Safety Conscious for Linux" and that is just a fraction of the many thing's i will be learning while on Linux.

all reply's are appreciated.

Thank You all for the responses
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mvaterlaus
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PostPosted: Thu Jul 18, 2013 8:33 am    Post subject: Reply with quote

hi,
I don't know, if you allready know this [1] guide, but it gives a start to general security in gentoo linux. check it out.


[1]http://www.gentoo.org/doc/en/security/security-handbook.xml
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slicktux
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PostPosted: Fri Jul 19, 2013 2:55 am    Post subject: Reply with quote

mvaterlaus wrote:
hi,
I don't know, if you allready know this [1] guide, but it gives a start to general security in gentoo linux. check it out.


[1]http://www.gentoo.org/doc/en/security/security-handbook.xml


ah great, thank you! i will be doing some reading on this handbook.
_________________
"Yeah! I am just an atom in an ectoplasmic sea, Without direction or a reason to exist.
The anechoic nebula rotating in my brain, Is persuading me, contritely, to persist."

Dr. Graffin
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