The macOS system must configure SSHD Channel Timeout to 900.

If SSHD is enabled it must be configured with session Channel Timeout set to 900.

This will set the time out when the session is inactive.

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-000163-GPOS-00072,SRG-OS-000279-GPOS-00109

Verify the macOS system is configured to set the SSHD Channel Timeout to 900 with the following command:

/usr/sbin/sshd -G | /usr/bin/awk -F "=" '/channeltimeout session:*/{print $2}'

If the result is not "900", this is a finding.

Configure the macOS system to set the SSHD Channel Timeout to 900 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 'channeltimeout session:*=900' "${include_dir}01-mscp-sshd.conf" 2>/dev/null || echo "channeltimeout session:*=900" >> "${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