From SLES 12 Security Technical Implementation Guide
Part of SRG-OS-000228-GPOS-00088
Associated with: CCI-001384 CCI-001385 CCI-001386 CCI-001387 CCI-001388
Display of a standardized and approved use notification before granting access to the publicly accessible SUSE operating system ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance.
Verify all remote connections via SSH to the SUSE operating system display the Standard Mandatory DoD Notice and Consent Banner before granting access to the system. Check for the location of the file containing the Standard Mandatory DoD Notice and Consent Banner being used by performing the following command: # sudo grep -i banner /etc/ssh/sshd_config Banner=/etc/issue The command will return the "Banner" keyword and the path of the file that contains the Standard Mandatory DoD Notice and Consent Banner. It is standard practice for this to be stored in "/etc/issue". If the line is commented out, this is a finding. Check the file that was specified by the "Banner" keyword above and check that it matches the Standard Mandatory DoD Notice and Consent Banner text exactly: "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 text in the file does not match the Standard Mandatory DoD Notice and Consent Banner exactly, this is a finding.
Configure the SUSE operating system to display the Standard Mandatory DoD Notice and Consent Banner before granting access to the system via the SSH. Edit the "/etc/ssh/sshd_config" file to uncomment the banner keyword and configure it to point to a file that will contain the logon banner (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor). An example configuration line is: Banner=/etc/issue Either create the file containing the banner or replace the text in the file with the Standard Mandatory DoD Notice and Consent Banner. The DoD required text is: "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."
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