Title

RHEL 8 must prevent system daemons from using Kerberos for authentication. (Cat II impact)

Discussion

Unapproved mechanisms that are used for authentication to the cryptographic module are not verified and therefore cannot be relied upon to provide confidentiality or integrity, and DoD data may be compromised. RHEL 8 systems utilizing encryption are required to use FIPS-compliant mechanisms for authenticating to cryptographic modules. The key derivation function (KDF) in Kerberos is not FIPS compatible. Ensuring the system does not have any keytab files present prevents system daemons from using Kerberos for authentication. A keytab is a file containing pairs of Kerberos principals and encrypted keys. FIPS 140-2 is the current standard for validating that mechanisms used to access cryptographic modules utilize authentication that meets DoD requirements. This allows for Security Levels 1, 2, 3, or 4 for use on a general-purpose computing system.

Check Content

Verify that RHEL 8 prevents system daemons from using Kerberos for authentication. If the system is a server utilizing krb5-server-1.17-18.el8.x86_64 or newer, this requirement is not applicable. If the system is a workstation utilizing krb5-workstation-1.17-18.el8.x86_64 or newer, this requirement is not applicable. Check if there are available keytabs with the following command: $ sudo ls -al /etc/*.keytab If this command produces any file(s), this is a finding.

Fix Text

Configure RHEL 8 to prevent system daemons from using Kerberos for authentication. Remove any files with the .keytab extension from the operating system.

Additional Identifiers

Rule ID: SV-230238r1017057_rule

Vulnerability ID: V-230238

Group Title: SRG-OS-000120-GPOS-00061

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.