V-260575

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-000105-GPOS-00052, SRG-OS-000106-GPOS-00053, SRG-OS-000107-GPOS-00054, SRG-OS-000108-GPOS-00055

Check Content

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.