Title

The macOS system must enforce SSH to display a policy banner. (Cat II impact)

Discussion

SSH must be configured to display a policy banner. Displaying a standardized and approved use notification before granting access to the operating system ensures that users are provided with privacy and security notification verbiage that is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance. System use notifications are required only for access via login interfaces with human users and are not required when such human interfaces do not exist. NOTE: /etc/ssh/sshd_config will be automatically modified to its original state following any update or major upgrade to the operating system. Satisfies: SRG-OS-000023-GPOS-00006, SRG-OS-000024-GPOS-00007

Check Content

Verify the macOS system is configured to display the contents of "/etc/banner" before granting access to the system with the following command: /usr/sbin/sshd -G | /usr/bin/grep -c "^banner /etc/banner" If the command does not return "1", this is a finding.

Fix Text

Configure the macOS system to display the contents of "/etc/banner" before granting access to the system with the following command: include_dir=$(/usr/bin/awk '/^Include/ {print $2}' /etc/ssh/sshd_config | /usr/bin/tr -d '*') if [[ -z $include_dir ]]; then /usr/bin/sed -i.bk "1s/.*/Include \/etc\/ssh\/sshd_config.d\/\*/" /etc/ssh/sshd_config fi /usr/bin/grep -qxF 'banner /etc/banner' "${include_dir}01-mscp-sshd.conf" 2>/dev/null || echo "banner /etc/banner" >> "${include_dir}01-mscp-sshd.conf" for file in $(ls ${include_dir}); do if [[ "$file" == "100-macos.conf" ]]; then continue fi if [[ "$file" == "01-mscp-sshd.conf" ]]; then break fi /bin/mv ${include_dir}${file} ${include_dir}20-${file} done

Additional Identifiers

Rule ID: SV-269093r1034754_rule

Vulnerability ID: V-269093

Group Title: SRG-OS-000023-GPOS-00006

Expert Comments

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