120 lines
4.1 KiB
Bash
Executable File
120 lines
4.1 KiB
Bash
Executable File
#!/bin/bash
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#
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# harbian-audit for Debian GNU/Linux 9/10/11/12 Hardening
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#
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#
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# 7.7.4.2 Ensure loopback traffic is configured (Scored)
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# Include ipv4 and ipv6
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# Add this feature:Author : Samson wen, Samson <sccxboy@gmail.com>
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#
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set -e # One error, it's over
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set -u # One variable unset, it's over
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HARDENING_LEVEL=2
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INPUT_ACCEPT=1
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OUTPUT_ACCEPT=1
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INPUT_DENY=1
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IP4VERSION="IPS4"
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PACKAGE_NFT='nftables'
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# This function will be called if the script status is on enabled / audit mode
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audit () {
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is_pkg_installed $PACKAGE_NFT
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if [ $FNRET != 0 ]; then
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# Check the loopback interface to accept INPUT traffic.
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ensure_lo_traffic_input_is_accept "$IP4VERSION"
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if [ $FNRET = 0 ]; then
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INPUT_ACCEPT=0
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info "Iptables loopback traffic INPUT has configured!"
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else
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INPUT_ACCEPT=1
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info "Iptables: loopback traffic INPUT is not configured!"
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fi
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# Check the loopback interface to accept OUTPUT traffic.
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ensure_lo_traffic_output_is_accept "$IP4VERSION"
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if [ $FNRET = 0 ]; then
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OUTPUT_ACCEPT=0
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info "Iptables loopback traffic OUTPUT has configured!"
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else
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OUTPUT_ACCEPT=1
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info "Iptables: loopback traffic OUTPUT is not configured!"
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fi
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# all other interfaces to deny traffic to the loopback network.
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ensure_lo_traffic_other_if_input_is_deny "$IP4VERSION"
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if [ $FNRET = 0 ]; then
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INPUT_DENY=0
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info "Iptables loopback traffic INPUT deny from other interfaces has configured!"
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else
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INPUT_DENY=1
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info "Iptables: loopback traffic INPUT deny from other interfaces is not configured!"
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fi
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if [ $INPUT_ACCEPT -eq 0 -a $OUTPUT_ACCEPT -eq 0 -a $INPUT_DENY -eq 0 ]; then
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ok "Loopback traffic rules are configured!"
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else
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crit "Loopback traffic rules are not configured!"
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fi
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else
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if [ $(nft list chain ip filter INPUT 2>/dev/null | grep -c 'lo.*accept') -gt 0 -a $(nft list chain ip filter OUTPUT 2>/dev/null | grep -c 'lo.*accept') -gt 0 -a $(nft list chain ip filter INPUT 2>/dev/null | grep -c 'saddr.*127.0.0.0/8.*drop') -gt 0 ]; then
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ok "nftables loopback traffic INPUT/OUTPUT/deny-other-loopback-interfaces has configured!"
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FNRET=10
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else
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crit "nftables loopback traffic INPUT/OUTPUT/deny-other-loopback-interfaces is not configured!"
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FNRET=11
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fi
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fi
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}
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# This function will be called if the script status is on enabled mode
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apply () {
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if [ $FNRET = 10 ]; then
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ok "nftables loopback traffic INPUT/OUTPUT/deny-other-loopback-interfaces has configured!"
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elif [ $FNRET = 11 ]; then
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warn "nftables loopback traffic INPUT/OUTPUT/deny-other-loopback-interfaces is not configured! Need the administrator to manually add it. "
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else
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if [ $INPUT_ACCEPT = 0 ]; then
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ok "Iptables loopback traffic INPUT has configured!"
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else
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warn "Iptables loopback traffic INPUT is not configured! Need the administrator to manually add it. Howto set: iptables -A INPUT -i lo -j ACCEPT"
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fi
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if [ $OUTPUT_ACCEPT = 0 ]; then
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ok "Iptables loopback traffic OUTPUT has configured!"
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else
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warn "Iptables loopback traffic OUTPUT is not configured! Need the administrator to manually add it. Howto set: iptables -A OUTPUT -o lo -j ACCEPT"
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fi
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if [ $INPUT_DENY = 0 ]; then
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ok "Iptables loopback traffic INPUT deny from other interfaces has configured!"
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else
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warn "Iptables loopback traffic INPUT deny from 127.0.0.0/8 is not configured! Need the administrator to manually add it. Howto set: iptables -A INPUT -s 127.0.0.0/8 -j DROP"
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fi
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fi
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}
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# This function will check config parameters required
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check_config() {
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:
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}
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# Source Root Dir Parameter
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if [ -r /etc/default/cis-hardening ]; then
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. /etc/default/cis-hardening
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fi
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if [ -z "$CIS_ROOT_DIR" ]; then
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echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
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echo "Cannot source CIS_ROOT_DIR variable, aborting."
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exit 128
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fi
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# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
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if [ -r $CIS_ROOT_DIR/lib/main.sh ]; then
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. $CIS_ROOT_DIR/lib/main.sh
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else
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echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_ROOT_DIR in /etc/default/cis-hardening"
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exit 128
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fi
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