#!/bin/bash # # CIS Debian Hardening # # # 5.2.3 Ensure permissions on SSH public host key files are configured (Scored) # set -e # One error, it's over set -u # One variable unset, it's over HARDENING_LEVEL=1 DESCRIPTION="Checking permissions and ownership to root 644 for ssh public keys. " DIR='/etc/ssh' PERMISSIONS='644' USER='root' GROUP='root' OPTIONS=(-xdev -type f -name "ssh_host_*_key.pub") # This function will be called if the script status is on enabled / audit mode audit () { have_files_in_dir_correct_ownership $DIR $USER $GROUP OPTIONS if [ $FNRET = 0 ]; then ok "SSH public keys in $DIR have correct ownership" else crit "Some $DIR SSH public keys ownership were not set to $USER:$GROUP" fi have_files_in_dir_correct_permissions $DIR $PERMISSIONS OPTIONS if [ $FNRET = 0 ]; then ok "SSH public keys in $DIR have correct permissions" else crit "Some $DIR SSH public keys permissions were not set to $PERMISSIONS" fi } # This function will be called if the script status is on enabled mode apply () { have_files_in_dir_correct_ownership $DIR $USER $GROUP OPTIONS if [ $FNRET = 0 ]; then ok "SSH public keys in $DIR have correct ownership" else warn "fixing $DIR SSH public keys ownership to $USER:$GROUP" find /etc/ssh -xdev -type f -name 'ssh_host_*_key.pub' -exec chown root:root {} \; fi have_files_in_dir_correct_permissions $DIR $PERMISSIONS OPTIONS if [ $FNRET = 0 ]; then ok "SSH public keys in $DIR have correct permissions" else info "fixing $DIR SSH public keys permissions to $PERMISSIONS" find /etc/ssh -xdev -type f -name 'ssh_host_*_key.pub' -exec chmod 0644 {} \; fi } # This function will check config parameters required check_config() { does_user_exist $USER if [ $FNRET != 0 ]; then crit "$USER does not exist" exit 128 fi does_group_exist $GROUP if [ $FNRET != 0 ]; then crit "$GROUP does not exist" exit 128 fi } # Source Root Dir Parameter if [ -r /etc/default/cis-hardening ]; then . /etc/default/cis-hardening fi if [ -z "$CIS_ROOT_DIR" ]; then echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment." echo "Cannot source CIS_ROOT_DIR variable, aborting." exit 128 fi # Main function, will call the proper functions given the configuration (audit, enabled, disabled) if [ -r $CIS_ROOT_DIR/lib/main.sh ]; then . $CIS_ROOT_DIR/lib/main.sh else echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_ROOT_DIR in /etc/default/cis-hardening" exit 128 fi