scap-security-guide December 2024

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Mapping auditd rules to compliance requirements
by Jeff Walzer 07 Jan '25

07 Jan '25

I am reviewing the auditd rules here <https://github.com/linux-audit/audit-userspace/blob/master/rules/30-ospp-v4…>, and for example the rules block below lists the rules for Group add delete modify: ## Group add delete modify. This is covered by pam. However, someone could ## open a file and directly create or modify a user, so we'll watch group and ## gshadow for writes -a always,exit -F arch=b32 -F path=/etc/passwd -F perm=wa -F auid>=1000 -F auid!=unset -F key=user-modify -a always,exit -F arch=b64 -F path=/etc/passwd -F perm=wa -F auid>=1000 -F auid!=unset -F key=user-modify -a always,exit -F arch=b32 -F path=/etc/shadow -F perm=wa -F auid>=1000 -F auid!=unset -F key=user-modify -a always,exit -F arch=b64 -F path=/etc/shadow -F perm=wa -F auid>=1000 -F auid!=unset -F key=user-modify -a always,exit -F arch=b32 -F path=/etc/group -F perm=wa -F auid>=1000 -F auid!=unset -F key=group-modify -a always,exit -F arch=b64 -F path=/etc/group -F perm=wa -F auid>=1000 -F auid!=unset -F key=group-modify -a always,exit -F arch=b32 -F path=/etc/gshadow -F perm=wa -F auid>=1000 -F auid!=unset -F key=group-modify -a always,exit -F arch=b64 -F path=/etc/gshadow -F perm=wa -F auid>=1000 -F auid!=unset -F key=group-modify I was looking to see if there was a doc that lists the individual auditd rules and the compliance requirement it would validate. So taking those rules above and dumping them into a spreadsheet as follows: User and Group Management Events Compliance Requirement Rules Group/Role Add, Delete, Modify (Success/Failure) -a always,exit -F arch=b32 -F path=/etc/passwd -F perm=wa -F auid>=1000 -F auid!=unset -F key=user-modify Group/Role Add, Delete, Modify (Success/Failure) -a always,exit -F arch=b64 -F path=/etc/passwd -F perm=wa -F auid>=1000 -F auid!=unset -F key=user-modify Group/Role Add, Delete, Modify (Success/Failure) -a always,exit -F arch=b32 -F path=/etc/shadow -F perm=wa -F auid>=1000 -F auid!=unset -F key=user-modify Group/Role Add, Delete, Modify (Success/Failure) -a always,exit -F arch=b64 -F path=/etc/shadow -F perm=wa -F auid>=1000 -F auid!=unset -F key=user-modify Group/Role Add, Delete, Modify (Success/Failure) -a always,exit -F arch=b32 -F path=/etc/group -F perm=wa -F auid>=1000 -F auid!=unset -F key=group-modify Group/Role Add, Delete, Modify (Success/Failure) -a always,exit -F arch=b64 -F path=/etc/group -F perm=wa -F auid>=1000 -F auid!=unset -F key=group-modify Group/Role Add, Delete, Modify (Success/Failure) -a always,exit -F arch=b32 -F path=/etc/gshadow -F perm=wa -F auid>=1000 -F auid!=unset -F key=group-modify Group/Role Add, Delete, Modify (Success/Failure) -a always,exit -F arch=b64 -F path=/etc/gshadow -F perm=wa -F auid>=1000 -F auid!=unset -F key=group-modify Basically a mapping of compliance requirements and the rules associated that would be used to validate the compliance requirement. Thx

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scap-security-guide December 2024