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os_sshd_per_source_penalties_configure Configure SSHD PerSourcePenalties

NIST macOS Security Compliance Project Sequoia Guidance, Revision 4.0 (be5491f)
All changes in this version
first version loaded macOS

Title

Configure SSHD PerSourcePenalties

Control

/usr/sbin/sshd -G | /usr/bin/grep -q "persourcepenalties no" && echo "no" || echo "yes"

Discussion

If SSHD is enabled then it _MUST_ be configured with the Per Source Penalties configured.

Per Source Penalties controls penalties for various conditions that may represent attacks on sshd.

Penalties are enabled by default.

NOTE: On macOS 15.2 and higher the SSH configuration can be reset to the macOS default by running /usr/libexec/reset-ssh-configuration.

Related controls

sc-5

Fix

[source,bash]
----
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 'persourcepenalties yes' "${include_dir}01-mscp-sshd.conf" 2>/dev/null || echo "persourcepenalties yes" >> "${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
----