V-270662

Discussion

Without the use of multifactor authentication, the ease of access to privileged functions is greatly increased. Multifactor authentication requires using two or more factors to achieve authentication. Factors include: 1) Something a user knows (e.g., password/PIN); 2) Something a user has (e.g., cryptographic identification device, token); and 3) Something a user is (e.g., biometric). A privileged account is defined as an information system account with authorizations of a privileged user. Network access is defined as access to an information system by a user (or a process acting on behalf of a user) communicating through a network (e.g., local area network, wide area network, or the internet). The DOD common access card (CAC) with DOD-approved PKI is an example of multifactor authentication. Satisfies: SRG-OS-000705-GPOS-00150, SRG-OS-000105-GPOS-00052, SRG-OS-000106-GPOS-00053, SRG-OS-000107-GPOS-00054, SRG-OS-000108-GPOS-00055, SRG-OS-000375-GPOS-00160

Check Content

Verify Ubuntu 24.04 LTS has the packages required for multifactor authentication installed with the following command:

$ dpkg -l | grep sssd
ii  sssd     2.9.4-1.1ubuntu6.1     amd64     System Security Services Daemon -- metapackage
ii  sssd-ad     2.9.4-1.1ubuntu6.1     amd64     System Security Services Daemon -- Active Directory back end
ii  sssd-ad-common     2.9.4-1.1ubuntu6.1     amd64     System Security Services Daemon -- PAC responder
ii  sssd-common     2.9.4-1.1ubuntu6.1     amd64     System Security Services Daemon -- common files
ii  sssd-ipa     2.9.4-1.1ubuntu6.1     amd64     System Security Services Daemon -- IPA back end
ii  sssd-krb5     2.9.4-1.1ubuntu6.1     amd64     System Security Services Daemon -- Kerberos back end
ii  sssd-krb5-common     2.9.4-1.1ubuntu6.1     amd64     System Security Services Daemon -- Kerberos helpers
ii  sssd-ldap     2.9.4-1.1ubuntu6.1     amd64     System Security Services Daemon -- LDAP back end
ii  sssd-proxy     2.9.4-1.1ubuntu6.1     amd64     System Security Services Daemon -- proxy back end

If the "sssd" package is not installed, this is a finding. The additional sssd components listed by the command may differ from configuration to configuration.  

Ensure that "libpam-sss" (the PAM integration module for SSSD) is installed with the following command:

$ dpkg -l | grep libpam-sss
i  libpam-sss:amd64     2.9.4-1.1ubuntu6.1     amd64     Pam module for the System Security Services Daemon

Ensure that "libnss-sss" (the NSS module for retrieving user and group information) is installed with the following command:

$ dpkg -l | grep libnss-sss
ii  libnss-sss:amd64     2.9.4-1.1ubuntu6.1      amd64     Nss library for the System Security Services Daemon