The macOS system must configure SSHD Channel Timeout to 900.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-259446 | APPL-14-000120 | SV-259446r970703_rule | CCI-001133 | medium |
| Description | ||||
| 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 | ||||
| STIG | Date | |||
| Apple macOS 14 (Sonoma) Security Technical Implementation Guide | 2024-12-04 | |||
Details
Check Text (C-259446r970703_chk)
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 $2}'
If the result is not "900", this is a finding.
Fix Text (F-63093r940959_fix)
Configure the macOS system to set the SSHD Channel Timeout to 900 with the following command:
include_dir=$(/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