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Configure auditing of successful ownership changes (AArch64)

An XCCDF Rule

Description

Ensure that successful attempts to change an ownership of files or directories are audited. The following rules configure audit as described above: 

## Successful ownership change
-a always,exit -F arch=b32 -S lchown,fchown,chown,fchownat -F success=1 -F auid>=1000 -F auid!=unset -F key=successful-owner-change
-a always,exit -F arch=b64 -S fchown,fchownat -F success=1 -F auid>=1000 -F auid!=unset -F key=successful-owner-change
Load new Audit rules into kernel by running: 
augenrules --load
Note: This rule uses a special set of Audit rules to comply with OSPP 4.2.1. You may reuse this rule in different profiles. If you decide to do so, it is recommended that you inspect contents of the file closely and make sure that they are alligned with your needs.

Rationale

Auditing of successful ownership changes of files or directories helps in monitoring or investingating of activities performed on the system.

ID
xccdf_org.ssgproject.content_rule_audit_owner_change_success_aarch64
Severity
Medium
References
Updated



Remediation - Shell Script

# Remediation is applicable only in certain platforms
if [ ! -f /.dockerenv ] && [ ! -f /run/.containerenv ] && { grep -q aarch64 /proc/sys/kernel/osrelease; }; then

cat << 'EOF' > /etc/audit/rules.d/30-ospp-v42-6-owner-change-success.rules
## Successful ownership change
-a always,exit -F arch=b32 -S lchown,fchown,chown,fchownat -F success=1 -F auid>=1000 -F auid!=unset -F key=successful-owner-change

Remediation - Ansible

- name: Put contents into /etc/audit/rules.d/30-ospp-v42-6-owner-change-success.rules
    according to policy
  copy:
    dest: /etc/audit/rules.d/30-ospp-v42-6-owner-change-success.rules
    content: |
      ## Successful ownership change