The macOS system must enforce SSH to display a policy banner.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-269093	SRG-OS-000023-GPOS-00006	APPL-15-000024	SV-269093r1034754_rule	2025-02-20	1

Description
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

Description

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

ℹ️ Check
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
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

✔️ Fix

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