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Operating Systems AIX Securing AIX - Hardening Lesson 101 Post 302772339 by MichaelFelt on Monday 25th of February 2013 06:25:56 AM

02-25-2013

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Securing AIX - Hardening Lesson 101

Every now and then I google: SecuringAIX (I write a blog by that name, so I am curious where it stands - and to my dismay I did not make the top5 today from my current location.

However, this unix.com/aix thread did make the top5- and, imho, it is lacking in clarity and ease. So, I thought I would post a refresher - AIX Hardening 101.

Since AIX 5.3, ML05 I believe (so we are anno 2005 I believe) - AIX intradiced a tool known as AIX Security Expert, or aixpert. This is meant to be pretty much - push button security - from it's start at least as much more has been added.

For a test drive - let it tell you what it finds wrong (note, wrong means different. If the level you choose thinks 4 is the right number and you have a different number (e.g., 3 or 5) it will say it is failed.).

So, test drive - no configuration changes made to your system with:

Code:

# [[ -e /etc/security/aixpert/core/appliedaixpert.xml ]] && mv /etc/security/aixpert/core/appliedaixpert.xml /etc/security/aixpert/core/appliedaixpert.xml.save
# aixpert -l high|medium|low|default|sox-cobit -n -o /etc/security/aixpert/core/appliedaixpert.xml
# aixpert -c
# [[ -e /etc/security/aixpert/core/appliedaixpert.xml.save ]] && mv  /etc/security/aixpert/core/appliedaixpert.xml.save  /etc/security/aixpert/core/appliedaixpert.xml
# more /etc/security/aixpert/check_report.txt

Note: you must choose a level to test against - one of high|medium|low|default|sox-cobit

This is part of bos.security.rte so it is always installed. Up to you to use it!

MichaelFelt

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LEARN ABOUT DEBIAN

hardened-ld

HARDENED-LD(1)							 Debian GNU/Linux						    HARDENED-LD(1)

NAME

       hardened-ld - linker wrapper to enforce hardening toolchain improvements

SYNOPSIS

       export DEB_BUILD_HARDENING=1

       ld ...

DESCRIPTION

       The  hardened-ld  wrapper  is  normally	used  by  calling  ld  as usual with DEB_BUILD_HARDENING set to 1. It will configure the necessary
       toolchain hardening features. By default, all features are enabled. If a given feature does not work correctly and needs  to  be  disabled,
       the corresponding environment variables mentioned below can be set to 0.

ENVIRONMENT

       DEB_BUILD_HARDENING=1
	      Enable hardening features.

       DEB_BUILD_HARDENING_DEBUG=1
	      Print the full resulting gcc command line to STDERR before calling gcc.

       DEB_BUILD_HARDENING_RELRO=0
	      Don't mark ELF sections read-only after start. See README.Debian for details.

       DEB_BUILD_HARDENING_BINDNOW=0
	      Don't mark ELF loader for start-up dynamic resolution. See README.Debian for details.

NOTES

       System-wide settings can be added to /etc/hardening-wrapper.conf, one per line.

       The  real  ld is renamed ld.real, and a diversion is registered with dpkg-divert(1).  Thus hardened-ld's idea of the default ld is dictated
       by whatever package installed /usr/bin/ld.

SEE ALSO

       hardened-cc(1) ld(1)

Debian Project							    2008-01-08							    HARDENED-LD(1)