OL 9 must only allow the use of DoW PKI-established certificate authorities (CAs) for authentication in the establishment of protected sessions to OL 9.

Untrusted CAs can issue certificates, but they may be issued by organizations or individuals that seek to compromise DoW systems or by organizations with insufficient security controls. If the CA used for verifying the certificate is not DoW approved, trust of this CA has not been established.

The DoW will only accept PKI-certificates obtained from a DoW-approved internal or external certificate authority. Reliance on CAs for the establishment of secure sessions includes, for example, the use of SSL/TLS certificates.

Verify OL 9 only allows the use of DoW PKI-established certificate authorities using the following command:

$ trust list

pkcs11:id=%7C%42%96%AE%DE%4B%48%3B%FA%92%F8%9E%8C%CF%6D%8B%A9%72%37%95;type=cert type: certificate label: ISRG Root X2 trust: anchor category: authority

If any nonapproved CAs are returned, this is a finding.

Configure OL 9 to only allow the use of DoW PKI-established certificate authorities.

For each untrusted CA, export the certificate to a file and add it to the blocklist:

$ trust dump --filter "pkcs11:id=%7C%42%96%AE%DE%4B%48%3B%FA%92%F8%9E%8C%CF%6D%8B%A9%72%37%95;type=cert" > /etc/pki/ca-trust/source/blocklist/ISRGRootX2

$ update-ca-trust 

Verify that the certificate is in the blocklist:

$ trust list --filter=blocklist p11-kit: overriding trust for anchor in blocklist: ISRGRootX2 pkcs11:id=%7C%42%96%AE%DE%4B%48%3B%FA%92%F8%9E%8C%CF%6D%8B%A9%72%37%95;type=cert type: certificate label: ISRG Root X2 trust: distrusted category: authority

pkcs11:id=%88%68%BF%E0%8E%35%C4%3B%38%6B%62%F7%28%3B%84%81%C8%0C%D7%4D;type=cert type: certificate label: Explicitly Distrust DigiNotar Root CA trust: distrusted category: authority