UBTU-22-612020 Ubuntu 22.04 LTS must implement smart card logins for multifactor authentication for local and network access to privileged and nonprivileged accounts.
All changes in this version
Maps to IA-2(1), IA-2(2), IA-2(3), IA-2(4), IA-2(6) via CCI-000765, CCI-000766, CCI-004047, CCI-000767, CCI-000768
Title
Ubuntu 22.04 LTS must implement smart card logins for multifactor authentication for local and network access to privileged and nonprivileged accounts.
Control
Verify that the "pam_pkcs11.so" module is configured by using the following command: $ grep -i pam_pkcs11.so /etc/pam.d/common-auth auth [success=3 default=ignore] pam_pkcs11.so If "pam_pkcs11.so" is commented out or is missing, this is a finding. Verify the sshd daemon allows public key authentication by using the following command: $ sudo /usr/sbin/sshd -dd 2>&1 | awk '/filename/ {print $4}' | tr -d '\r' | tr '\n' ' ' | xargs sudo grep -iH 'pubkeyauthentication' /etc/ssh/sshd_config:PubkeyAuthentication yes If "PubkeyAuthentication" is not set to "yes" or is commented out or missing, or if conflicting results are returned, this is a finding.
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 DoW common access card (CAC) with DoW-approved PKI is an example of multifactor authentication. Satisfies: SRG-OS-000105-GPOS-00052, SRG-OS-000106-GPOS-00053, SRG-OS-000107-GPOS-00054, SRG-OS-000108-GPOS-00055
Related controls
CCI-000765, CCI-000766, CCI-000767, CCI-000768, CCI-004047
Fix
Configure Ubuntu 22.04 LTS to use multifactor authentication for access to accounts. Add or modify the following line in the "/etc/pam.d/common-auth" file: auth [success=3 default=ignore] pam_pkcs11.so Add or modify the following line in the "/etc/ssh/sshd_config" file: PubkeyAuthentication yes