V-238305

Discussion

In order to ensure operating systems have a sufficient storage capacity in which to write the audit logs, operating systems need to be able to allocate audit record storage capacity. The task of allocating audit record storage capacity is usually performed during initial installation of the operating system.

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Verify the Ubuntu operating system allocates audit record storage capacity to store at least one week's worth of audit records when audit records are not immediately sent to a central audit record storage facility. 
 
Determine which partition the audit records are being written to with the following command: 
 
$ sudo grep ^log_file /etc/audit/auditd.conf 
log_file = /var/log/audit/audit.log 
 
Check the size of the partition that audit records are written to (with the example being "/var/log/audit/") with the following command: 
 
$ sudo df –h /var/log/audit/ 
/dev/sda2 24G 10.4G 13.6G 43% /var/log/audit 
 
If the audit records are not written to a partition made specifically for audit records ("/var/log/audit" is a separate partition), determine the amount of space being used by other files in the partition with the following command: 
 
$ sudo du –sh [audit_partition] 
1.8G /var/log/audit 
 
Note: The partition size needed to capture a week's worth of audit records is based on the activity level of the system and the total storage capacity available. In normal circumstances, 10.0 GB of storage space for audit records will be sufficient. 
 
If the audit record partition is not allocated for sufficient storage capacity, this is a finding.