Hi everybody,

I would like to secure my site and I want to implement CAS for SSO, SELinux for the permission into my server and CODA, this last one I have read is not compatible with it, but I don't know if somebody have tried something.

The most important request from HQ is use SELinux, they're conviced is the best one for the user permissions. I tried to look for some info in internet but there almost nothing.

I appreciate very much any help.

Thanks
majepiga

Hi,

if you're serious about it, try these links :

http://danwalsh.livejournal.com/ - Dan Walsh has written many tutorials about SELinux. He actually *wrote* SELinux.

http://oss.tresys.com/projects/refpolicy - If you feel like writing some SELinux policy by yourself. You should.

http://www.engardelinux.org/modules/index/selinux/ - Engarde Linux, a security heavyweight OS built upon SELinux.

SELinux is hard, but then again--as usual--security is just a state of mind; the LSM, a framework which provides an ecosystem for mandatory access control security models, including SELinux and Apparmor, has been compromised. Discovered in 2009, an exploit infamously named as wunderbar emporium has successfully bypassed LSM module in the kernel, effectively turned SELinux security contexts into nothing and gave up root access for free.

Good luck.

what operating system???
RHEL 6 ,fedora 14,centos 5.6,SL 6 have SELinux built in

The RHEL Admin manual here has a thorough explanation http://www.linuxtopia.org/online_boo...ion/index.html

Arch wiki also has a good bit of info
https://wiki.archlinux.org/index.php/SELinux

if your OS dose not come with a SE enabled kernel .

Thanks a lot guys! I'll check all the info suggested, my OS is FEDORA 14.

Hi Guys,

I would like to try to do something with CODA and SELinux I have read all the given information, but I would like to know your opinion about if it is possible to do a mirroring of the SELinux policies and the CODA policies? I think maybe if I create a script which I can apply my SElinux policies into my filesystem CODA, I could get work these systems together.

Thanks in advance
Majepiga

so what became of the wunderbar emporium exploit?

A root shell. There's a demo here.
I tried it on kernel 2.6-18-xx once, running SELinux strict policy in enforcing mode, execute the exploit, and it dropped me a root shell after the video's over.

Sorry, I meant is the vulnability still there for the expliot? or has SELinux fixed it?

The 2009 Julien Tinnes / Tavis Ormandy sendpage vulnerability aka incorrect proto_ops initialization aka CVE-2009-2692 was corrected on August 13th 2009: http://git.kernel.org/?p=linux/kerne...9e8945cf0f1b98. Also to counter misconceptions: sure it was back in the days but nowadays running and maintaining SELinux is not hard anymore and wrt to the LSM compromise: GRSecurity lives outside of the LSM and can't be run in parallel with SELinux but that doesn't make it flawless either: grsec/PaX bypass (April 2011, fixed).

Interesting....Can't GRsecurity live parrellell to SELinux if you disable GRsecurity's RBAC?