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os_install_log_retention_configure Configure Install.log Retention to $ODV

NIST macOS Security Compliance Project Sequoia Guidance, Revision 4.0 (be5491f)
All changes in this version
first version loaded macOS

Title

Configure Install.log Retention to $ODV

Control

/usr/sbin/aslmanager -dd 2>&1 | /usr/bin/awk '/\/var\/log\/install.log$/ {count++} /Processing module com.apple.install/,/Finished/ { for (i=1;i<=NR;i++) { if ($i == "TTL" && $(i+2) >= $ODV) { ttl="True" }; if ($i == "MAX") {max="True"}}} END{if (count > 1) { print "Multiple config files for /var/log/install, manually remove the extra files"} else if (max == "True") { print "all_max setting is configured, must be removed" } if (ttl != "True") { print "TTL not configured" } else { print "Yes" }}'

Discussion

The install.log _MUST_ be configured to require records be kept for a organizational defined value before deletion, unless the system uses a central audit record storage facility.

Related controls

au-11, au-4

Fix

[source,bash]
----
/usr/bin/sed -i '' "s/\* file \/var\/log\/install.log.*/\* file \/var\/log\/install.log format='\$\(\(Time\)\(JZ\)\) \$Host \$\(Sender\)\[\$\(PID\\)\]: \$Message' rotate=utc compress file_max=50M size_only ttl=$ODV/g" /etc/asl/com.apple.install
----

NOTE: If there are multiple configuration files in /etc/asl that are set to process the file /var/log/install.log, these files will have to be manually removed.