V-275619

Discussion

Display of a standardized and approved use notification before granting access to the publicly accessible operating system ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance. System use notifications are required only for access via logon interfaces with human users and are not required when such human interfaces do not exist. The banner must be formatted in accordance with applicable DOD policy. Satisfies: SRG-OS-000228-GPOS-00088, SRG-OS-000023-GPOS-00006, SRG-OS-000024-GPOS-00007

Check Content

Verify Ubuntu 22.04 LTS displays the Standard Mandatory DOD Notice and Consent Banner before granting access to Ubuntu 22.04 LTS via an SSH logon 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 'banner' 
     /etc/ssh/sshd_config:Banner /etc/issue.net 
  
The command will return the banner option along with the name of the file that contains the SSH banner. If the line is commented out, missing, or conflicting results are returned, this is a finding. 
  
Verify the specified banner file matches the Standard Mandatory DOD Notice and Consent Banner exactly:  
  
     $ cat /etc/issue.net  
     You are accessing a U.S. Government (USG) Information System (IS) that is 
     provided for USG-authorized use only. By using this IS (which includes any 
     device attached to this IS), you consent to the following conditions: 
     -The USG routinely intercepts and monitors communications on this IS for 
     purposes including, but not limited to, penetration testing, COMSEC monitoring, 
     network operations and defense, personnel misconduct (PM), law enforcement 
     (LE), and counterintelligence (CI) investigations. 
     -At any time, the USG may inspect and seize data stored on this IS. 
     -Communications using, or data stored on, this IS are not private, are subject 
     to routine monitoring, interception, and search, and may be disclosed or used 
     for any USG-authorized purpose. 
     -This IS includes security measures (e.g., authentication and access controls) 
     to protect USG interests--not for your personal benefit or privacy. 
     -Notwithstanding the above, using this IS does not constitute consent to PM, LE 
     or CI investigative searching or monitoring of the content of privileged 
     communications, or work product, related to personal representation or services 
     by attorneys, psychotherapists, or clergy, and their assistants. Such 
     communications and work product are private and confidential. See User 
     Agreement for details. 
 
If the banner text does not match the Standard Mandatory DOD Notice and Consent Banner exactly, this is a finding.