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RHEL 8 must implement certificate status checking for multifactor authentication.


Overview

Finding ID Version Rule ID IA Controls Severity
V-230274 RHEL-08-010400 SV-230274r809281_rule Medium
Description
Using an authentication device, such as a DoD Common Access Card (CAC) or token that is separate from the information system, ensures that even if the information system is compromised, credentials stored on the authentication device will not be affected. Multifactor solutions that require devices separate from information systems gaining access include, for example, hardware tokens providing time-based or challenge-response authenticators and smart cards such as the U.S. Government Personal Identity Verification (PIV) card and the DoD CAC. RHEL 8 includes multiple options for configuring certificate status checking, but for this requirement focuses on the System Security Services Daemon (SSSD). By default, sssd performs Online Certificate Status Protocol (OCSP) checking and certificate verification using a sha256 digest function. Satisfies: SRG-OS-000375-GPOS-00160, SRG-OS-000377-GPOS-00162
STIG Date
Red Hat Enterprise Linux 8 Security Technical Implementation Guide 2022-06-15

Details

Check Text ( C-32943r743944_chk )
Verify the operating system implements certificate status checking for multifactor authentication.

Check to see if Online Certificate Status Protocol (OCSP) is enabled and using the proper digest value on the system with the following command:

$ sudo grep certificate_verification /etc/sssd/sssd.conf /etc/sssd/conf.d/*.conf | grep -v "^#"

certificate_verification = ocsp_dgst=sha1

If the certificate_verification line is missing from the [sssd] section, or is missing "ocsp_dgst=sha1", ask the administrator to indicate what type of multifactor authentication is being utilized and how the system implements certificate status checking. If there is no evidence of certificate status checking being used, this is a finding.
Fix Text (F-32918r809280_fix)
Configure the operating system to implement certificate status checking for multifactor authentication.

Review the "/etc/sssd/sssd.conf" file to determine if the system is configured to prevent OCSP or certificate verification.

Add the following line to the [sssd] section of the "/etc/sssd/sssd.conf" file:

certificate_verification = ocsp_dgst=sha1

The "sssd" service must be restarted for the changes to take effect. To restart the "sssd" service, run the following command:

$ sudo systemctl restart sssd.service