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Old 04-13-2014, 04:20 PM   #1
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Question auditd and rule read order optimization


As the subject states, I am wondering about the load that a large audit.rule file creates. So, in the case where multiple files and directories are being watched will it cause a high load on the system?

Something like the following :
## Watch for changes / reads on the audit
## configs and rules for auditd.
-w /etc/audit/auditd.conf -p wa -k AUDIT_cfg
-w /etc/audit/audit.rules -p wa -k AUDIT_cfg
-w /etc/audit/rules.d/ -p wa -k AUDIT_cfg

## Watch for change on security related config files.

-w /etc/hosts.allow -p wxa -k SYSEC_cfg
-w /etc/hosts.deny -p wxa -k SYSEC_cfg
-w /etc/denyhosts.conf -p wxa -k SYSEC_cfg
-w /etc/pam.d/ -p wa -k SYSEC_cfg
-w /etc/security/access.conf -p wa  -k SYSEC_cfg
-w /etc/security/limits.conf -p wa  -k SYSEC_cfg
-w /etc/security/pam_env.conf -p wa -k SYSEC_cfg
-w /etc/security/namespace.conf -p wa -k SYSEC_cfg
-w /etc/security/namespace.d/ -p wa -k SYSEC_cfg
-w /etc/security/namespace.init -p wa -k SYSEC_cfg
-w /etc/security/sepermit.conf -p wa -k SYSEC_cfg
-w /etc/security/time.conf -p wa -k SYSEC_cfg
-w /etc/security/ -p wxa -k SYSEC_cfg
I am wondering if it would be better to use an action that looks for multiple types of system calls. However, I am not seeing anything that shows that an action (-a) can be used to watch a path or file. Everything I am seeing in the man pages and google hits shows that the -w flag is used for a file or path watch.

Would it be possible to get some input on this from anyone? It just seems that things would run a bit better if it was a string of sys calls types made against a location, all in one rule. I dunno. Any help is appreciated.
Old 04-13-2014, 06:09 PM   #2
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# Active rules in set:
]# grep -v ^# /etc/audit/audit.rules |wc -l

# Amount of watches:
]# grep -v ^# /etc/audit/audit.rules|grep -c -- "-w"

# CPU usage of audit daemon:
]# \ps --no-headers -C auditd -opcpu
# I'd say at 500 rules it doesn't cause much load.


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