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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
Old 02-25-2013
IBM 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!
 

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secconfig(8)						      System Manager's Manual						      secconfig(8)

NAME
secconfig, secsetup - Security features setup graphical interface (Enhanced Security) SYNOPSIS
/usr/sbin/sysman secconfig NOTE: The secsetup utility has been replaced by the secconfig graphical interface. DESCRIPTION
The utility is a graphical interface used to select the level of system security needed. It can convert from Base to enhanced security mode, and configure base and enhanced security features. If you are using secconfig to enable Enhanced security, you must first have loaded the enhanced security subsets. You can run while the system is in multiuser mode. However, if you change the security level, the change is not completed until you reboot the system. For both base and enhanced security, the secconfig utility allows you to enable segment sharing, to enable access control lists (ACLs), and to restrict the setting of the execute bit to root only. For enhanced security, the secconfig utility additionally allows you to configure security support from simple shadow passwords all the way to a strict C2 level of security. Shadow password support is an easy method for system administrators, who do not wish to use all of the extended security features, to move each user's password out of /etc/passwd and into the extended user profile database (auth.db. You can use the Custom mode if you wish to select additional security features, such as breakin detection and evasion, automatic database trimming, and password controls. When converting from base to enhanced security, secconfig updates the system default database (/etc/auth/system/default) and uses the con- vuser utility to migrate user accounts. While it is possible to convert user accounts from enhanced back to base, the default encryption algorithms and supported password lengths differ between base and enhanced security, and thus user account conversions do not succeed without a password change. NOTE: Because of the page table sharing mechanism used for shared libraries, the normal file system permissions are not adequate to protect against unauthorized reading. The secconfig interface allows you to disable segment sharing. The change in segment sharing takes effect at the next reboot. FILES
RELATED INFORMATION
acl(4), authcap(4), default(4), convuser(8), Security delim off secconfig(8)
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