auditd configuration for PCI DSS 10.2.x Compliance

[Boyce, Kevin P [US] (AS)]

I'm assuming you need PCI compliance?

You might look at the oscap tools that are part of the distribution.  They may have scripts prepared that satisfy most if not all of the PCI requirements.

Assuming you are using RHEL...
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/security_guide/sect-using_oscap

oscap info /usr/share/xml/scap/content/ssg-rhel7-ds.xml lists that there is a pci-dss profile available.  When you scan your system and generate a report it will typically list out the scripts required to fix many of the findings.  You can keep running the report/scanning function over to see if you got the changes right (your score should increase between iterations).

I typically run oscap xccdf eval --results  ~/results.xml --report ~/report.html --profile xccdf_org.ssgproject.content_profile_pcid-dss /usr/share/xml/scap/content/ssg-rhel7-ds.xml

You can view the report in firefox and expand through the results it should be pretty self explanatory.
I'd recommend testing everything in a non-production environment before implementing.

Kevin

From: linux-audit-bounces at redhat.com [mailto:linux-audit-bounces at redhat.com] On Behalf Of Joshua Ammons
Sent: Monday, January 15, 2018 9:52 AM
To: linux-audit at redhat.com
Subject: EXT :RE: auditd configuration for PCI DSS 10.2.x Compliance

Hello All,

Just thought I'd give this one more shot to see if anyone had any comments on my prior message (see below)?  Any input you have would be greatly appreciated.  I won't bother the group any more on this topic.

Thank you!

Joshua Ammons Advanced SIEM Engineer, Cybersecurity
Global Business Services
Office 479.204.4472 | Mobile 479.595.2291
Joshua.Ammons at walmart.com<mailto:Joshua.Ammons at walmart.com>

Walmart
805 Moberly Ln
Bentonville, AR  72716
Save money. Live better.

[cid:image001.png at 01D38DE8.9DD24A90]<https://walmart.facebook.com/groups/435932993428953/?fref=nf>

From: Joshua Ammons
Sent: Thursday, January 11, 2018 4:33 PM
To: 'linux-audit at redhat.com' <linux-audit at redhat.com<mailto:linux-audit at redhat.com>>
Subject: auditd configuration for PCI DSS 10.2.x Compliance

Hello,

I was wondering if anyone had any experience putting together an auditd configuration to meet PCI DSS 10.2.x requirements?  Below are the requirements and my thoughts for each one...if anyone has anything that they have done I'd love to hear it!

10.2.2    All actions taken by any individual with root or administrative privileges

*         Enable the pam_tty_audit.so shared library in /etc/pam.d/[su/sudo/sudo-i/su-l] files.

o   USER_TTY event type will contain all commands from privileged user.

*         Add following lines to /etc/audit/rules.d/audit.rules file:

o   # Audit all actions by any individual with root or administrative privileges

o   -a exit,always -F arch=b64 -F euid=0 -S execve -k root-commands

o   -a exit,always -F arch=b32 -F euid=0 -S execve -k root-commands

?  EXECVE event type will contain all commands from user with elevated privileges.

?  Question: with the pam_tty_audit.so enabled, and those commands being logged to USER_TTY events...is this rule needed also?
10.2.3    Access to all audit trails

*         I'm not sure the best route to cover this one.  If I add a rule to watch /var/log/* for 'wa' actions, those logs are constantly being written to so that would be too noisy I believe. Does anyone know how I would form a rule that would fire when a file within /var/log is accessed directly by a user?  Also, if the user makes any manual changes, such as deleting a file or modifying its contents?
10.2.4    Invalid logical access attempts

*         Based on my understanding, this wouldn't really be covered by auditd, but by the standard authpriv facility.  Anybody configure anything in auditd to cover this requirement?
10.2.5    Use of and changes to identification and authentication mechanisms-including but not limited to creation of new accounts and elevation of privileges-and all changes, additions, or deletions to accounts with root or administrative privileges

*         CRED_ACQ (sudo) and USER_AUTH (su) events should contain when a user sudo's or su's to privileged account.  My understanding is that these would not require any extra rules to be written.  However, I'm not quite sure how to handle the requirements to log creation of new accounts, and all changes, or deletions to accounts with root/admin privileges...any ideas?
10.2.6.   Initialization, stopping, or pausing of the audit logs

*         Auditd:

o   DAEMON_END events would indicate auditd was stopped.

o   DAEMON_START and SERVICE_START events would indicate when auditd initialized.

o   Anything else anybody would add here?

*         Rsyslog:

o   SERVICE_START event (unit=rsyslog) when rsyslog is initialized

o   SERVICE_STOP event (unit=rsyslog) when rsyslog is stopped

o   Anything else anybody would add here?
10.2.7    Creation and deletion of system- level objects

*         -w [DIRECTORY] -p wa rules for the directories below:

o   /bin

o   /sbin

o   /usr/bin

o   /usr/sbin

o   /var/lib

o   /usr/lib

o   /usr/libexec

o   /lib64

o   /usr/lib64

?  Would the above cover this requirement?  Any other suggestions here?

Joshua Ammons Advanced SIEM Engineer, Cybersecurity
Global Business Services
Office 479.204.4472 | Mobile 479.595.2291
Joshua.Ammons at walmart.com<mailto:Joshua.Ammons at walmart.com>

Walmart
805 Moberly Ln
Bentonville, AR  72716
Save money. Live better.

[cid:image002.png at 01D38DE8.9DD24A90]<https://walmart.facebook.com/groups/435932993428953/?fref=nf>

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