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APPL-26-000120 The macOS system must configure SSHD channel timeout to 900.

DISA STIG library V1R4
All changes in this version
first version loaded CAT II

Maps to AC-12, SC-10 via CCI-001133, CCI-002361

Title

The macOS system must configure SSHD channel timeout to 900.

Control

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 '/channeltimeout/{print $2}' If the result is not "900", this is a finding.

Discussion

If SSHD is enabled, it must be configured with session ChannelTimeout set to 900. This will set the timeout 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

Related controls

CCI-001133, CCI-002361

Fix

Configure the macOS system to set the SSHD ChannelTimeout 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