SLEM 5 must generate audit records for all uses of the "chacl" command.

Without generating audit records specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Audit records can be generated from various components within the information system (e.g., module or policy filter).

Verify SLEM 5 generates an audit record for all uses of the "chacl" command with the following command:

     > sudo auditctl -l | grep -w '/usr/bin/chacl'
     -a always,exit -S all -F path=/usr/bin/chacl -F perm=x -F auid>=1000 -F auid!=-1 -F key=prim_mod

If the command does not return a line that matches the example or the line is commented out, this is a finding.

Note: The "key=" value is arbitrary and can be different from the example output above.

Configure SLEM 5 to generate an audit record for all uses of the "chacl" command.

Add or update the following rules in the "/etc/audit/rules.d/audit.rules" file:

-a always,exit -F path=/usr/bin/chacl -F perm=x -F auid>=1000 -F auid!=unset -k prim_mod

To reload the rules file, restart the audit daemon:

     > sudo systemctl restart auditd.service

or issue the following command:

     > sudo augenrules --load

Note: The "-k <keyname>" at the end of the line gives the rule a unique meaning to help during an audit investigation. The <keyname> does not need to match the example above.