mirror of
https://github.com/ovh/debian-cis.git
synced 2025-08-31 11:54:07 +02:00
d171310d81
- nftables_loopback_is_configured.sh -> 4.2.6 - nftables_established_connections.sh -> 4.2.7 - iptables_flushed_with_nftables.sh -> 4.2.3 - ufw_loopback_is_configured.sh -> 4.1.4 - ufw_outbound_connection.sh -> 4.1.5 - ufw_default_deny.sh -> 4.1.7 - ufw_rules_them_all.sh -> 4.1.6
112 lines
3.2 KiB
Bash
Executable File
112 lines
3.2 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 ufw 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 ufw loopback traffic is configured"
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UFW_RULES_FILE="/etc/ufw/user.rules"
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UFW_IPV6_RULES_FILE="/etc/ufw/user6.rules"
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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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UFW_LOOPBACK_INPUT=1
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UFW_LOOPBACK_OUTPUT=1
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UFW_LOOPBACK_DENY=1
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UFW_LOOPBACK_DENY_IPV6=1
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# rules are saved in /etc/ufw/user.rules
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# easier to parse than ufw output
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if $SUDO_CMD grep "^[^#]*-[A,I].*input -i lo -j ACCEPT" "$UFW_RULES_FILE" >/dev/null 2>&1; then
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UFW_LOOPBACK_INPUT=0
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ok "ufw loopback input is configured"
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else
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crit "ufw loopback input is not configured"
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fi
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if $SUDO_CMD grep "^[^#]*-[A,I].*output -o lo -j ACCEPT" "$UFW_RULES_FILE" >/dev/null 2>&1; then
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UFW_LOOPBACK_OUTPUT=0
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ok "ufw loopback output is configured"
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else
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crit "ufw loopback output is not configured"
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fi
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if $SUDO_CMD grep "^[^#]*-[A,I].*input -s 127.0.0.0/8 -j DROP" "$UFW_RULES_FILE" >/dev/null 2>&1; then
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UFW_LOOPBACK_DENY=0
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ok "ufw traffic from 127.0.0.0/8 is dropped"
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else
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crit "ufw traffic 127.0.0.0/8 is not dropped"
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fi
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is_ipv6_enabled
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if [ "$FNRET" -eq 0 ]; then
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if $SUDO_CMD grep "^[^#]*-[A,I].*input -s ::1 -j DROP" "$UFW_IPV6_RULES_FILE" >/dev/null 2>&1; then
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UFW_LOOPBACK_DENY_IPV6=0
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ok "ufw traffic from ipv6 ::1 is dropped"
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else
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crit "ufw traffic from ipv6 ::1 is not dropped"
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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 [ "$UFW_LOOPBACK_INPUT" -ne 0 ]; then
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info "adding ufw rule to allow loopback input"
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ufw allow in on lo
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fi
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if [ "$UFW_LOOPBACK_OUTPUT" -ne 0 ]; then
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info "adding ufw rule to allow loopback output"
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ufw allow out on lo
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fi
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if [ "$UFW_LOOPBACK_DENY" -ne 0 ]; then
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info "adding ufw rule to drop traffic from 127.0.0.0/8"
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ufw ufw deny in from 127.0.0.0/8
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fi
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is_ipv6_enabled
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if [ "$FNRET" -eq 0 ] && [ "$UFW_LOOPBACK_DENY_IPV6" -ne 0 ]; then
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info "adding ufw rule to drop traffic from ::1"
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ufw ufw deny in from ::1
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fi
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}
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# This function will check config parameters required
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check_config() {
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:
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}
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# Source Root Dir Parameter
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if [ -r /etc/default/cis-hardening ]; then
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# shellcheck source=../../debian/default
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. /etc/default/cis-hardening
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fi
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if [ -z "$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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