The macOS system must configure SSHD unused connection timeout to 900.

An XCCDF Rule

Description

If SSHD is enabled, it must be configured with unused connection timeout set to 900. This will set the timeout when there are no open channels within a session. 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

ID: SV-268446r1034278_rule
Version: APPL-15-000130
Severity: Medium
References: CCI-001133 CCI-002361
Updated: about 2 months ago

Remediation Templates

Configure the macOS system to set the SSHD unused connection 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_configfi

/usr/bin/grep -qxF 'unusedconnectiontimeout 900' "${include_dir}01-mscp-sshd.conf" 2>/dev/null || echo "unusedconnectiontimeout 900" >> "${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

The macOS system must configure SSHD unused connection timeout to 900.

Description

Remediation Templates

A Manual Procedure