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Disable Kerberos by removing host keytab

An XCCDF Rule

Description

Kerberos is not an approved key distribution method for Common Criteria. To prevent using Kerberos by system daemons, remove the Kerberos keytab files, especially /etc/krb5.keytab.

Rationale

The key derivation function (KDF) in Kerberos is not FIPS compatible.

ID
xccdf_org.ssgproject.content_rule_kerberos_disable_no_keytab
Severity
Medium
References
Updated

Remediation Templates

A Shell Script

# Remediation is applicable only in certain platforms
if [ ! -f /.dockerenv ] && [ ! -f /run/.containerenv ]; then
rm -f /etc/*.keytab

else
    >&2 echo 'Remediation is not applicable, nothing was done'
fi

An Ansible Snippet

- name: Find keytab files
  find:
    paths: /etc/
    patterns: '*.keytab'
  register: keytab_files
  when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]