mirror of
https://github.com/ovh/debian-cis.git
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4be1a9d9e4
- iptables_loopback.sh -> 4.3.2.2 - iptables_rule_them_all.sh -> 4.3.2.4 - iptables_outbound_established.sh -> 4.3.2.3 - ip6tables_loopback.sh -> 4.3.3.2 - ip6tables_outbound_established.sh -> 4.3.3.3 - ip6tables_rule_them_all.sh -> 4.3.3.4 - ip6tables_default_deny_policy.sh -> 4.3.3.1
109 lines
3.1 KiB
Bash
Executable File
109 lines
3.1 KiB
Bash
Executable File
#!/bin/bash
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# run-shellcheck
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#
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# CIS Debian Hardening
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#
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#
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# Ensure iptables loopback traffic is configured (Automated)
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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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# shellcheck disable=2034
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HARDENING_LEVEL=2
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# shellcheck disable=2034
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DESCRIPTION="Ensure iptables loopback traffic is configured"
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PACKAGE="iptables"
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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 "$PACKAGE"
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if [ "$FNRET" -ne 0 ]; then
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crit "$PACKAGE is not installed"
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return
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fi
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IPTABLES_LOOPBACK_INPUT=1
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IPTABLES_LOOPBACK_OUTPUT=1
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IPTABLES_LOOPBACK_DENY=1
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local input_rules
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local output_rules
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input_rules=$($SUDO_CMD iptables -S INPUT 2>/dev/null)
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output_rules=$($SUDO_CMD iptables -S OUTPUT 2>/dev/null)
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# the '.*' below is in case of comments
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# shellcheck disable=2086
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if grep "\-A INPUT -i lo.*-j ACCEPT" <<<$input_rules >/dev/null; then
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ok "loopback is configured in iptables input rules"
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IPTABLES_LOOPBACK_INPUT=0
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else
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crit "loopback is not configured in iptables input rules"
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fi
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# shellcheck disable=2086
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if grep "\-A INPUT -s 127.0.0.0/8.*-j DROP" <<<$input_rules >/dev/null; then
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ok "127.0.0.0/8 is dropped in iptables input rules"
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IPTABLES_LOOPBACK_DENY=0
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else
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crit "127.0.0.0/8 is not dropped in iptables input rules"
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fi
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# shellcheck disable=2086
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if grep "\-A OUTPUT -o lo.*-j ACCEPT" <<<$output_rules >/dev/null; then
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ok "loopback is configured in iptables output rules"
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IPTABLES_LOOPBACK_OUTPUT=0
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else
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crit "loopback is not configured in iptables output rules"
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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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audit
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if [ "$IPTABLES_LOOPBACK_INPUT" -ne 0 ]; then
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info "update iptables rules to allow loopback input"
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iptables -A INPUT -i lo -j ACCEPT
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fi
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if [ "$IPTABLES_LOOPBACK_OUTPUT" -ne 0 ]; then
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info "update iptables rules to allow loopback" output
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iptables -A OUTPUT -o lo -j ACCEPT
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fi
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if [ "$IPTABLES_LOOPBACK_DENY" -ne 0 ]; then
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info "update iptables rules to drop 127.0.0.0/8 input"
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iptables -A INPUT -s 127.0.0.0/8 -j DROP
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fi
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}
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# This function will check config parameters required
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check_config() {
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:
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}
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# Source Root Dir Parameter
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if [ -r /etc/default/cis-hardening ]; then
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# shellcheck source=../../debian/default
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. /etc/default/cis-hardening
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fi
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if [ -z "$CIS_LIB_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_LIB_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 "${CIS_LIB_DIR}"/main.sh ]; then
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# shellcheck source=../../lib/main.sh
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. "${CIS_LIB_DIR}"/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_LIB_DIR in /etc/default/cis-hardening"
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exit 128
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fi
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