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
93 lines
2.8 KiB
Bash
Executable File
93 lines
2.8 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 nftables outbound and established connections are configured (Manual)
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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 nftables outbound and established connections are configured"
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NFTABLES_INPUT_ALLOWED=""
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NFTABLES_OUTPUT_ALLOWED=""
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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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local status
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for allowed in $NFTABLES_INPUT_ALLOWED; do
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protocol=$(awk -F ':' '{print $1}' <<<"$allowed")
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state=$(awk -F ':' '{print $2}' <<<"$allowed")
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if $SUDO_CMD nft list ruleset 2>/dev/null | awk '/hook input/,/}/' | grep -E "ip protocol $protocol ct state $state accept"; then
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ok "'$protocol' is accepted for state(s) '$state' in nftables 'input'"
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else
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crit "'$protocol' is not accepted for state(s) '$state' in nftables 'input'"
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fi
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done
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for allowed in $NFTABLES_OUTPUT_ALLOWED; do
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protocol=$(awk -F ':' '{print $1}' <<<"$allowed")
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state=$(awk -F ':' '{print $2}' <<<"$allowed")
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if $SUDO_CMD nft list ruleset 2>/dev/null | awk '/hook output/,/}/' | grep -E "ip protocol $protocol ct state $state accept"; then
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ok "'$protocol' is accepted for state(s) '$state' in nftables 'output'"
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else
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crit "'$protocol' is not accepted for state(s) '$state' in nftables 'output'"
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fi
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done
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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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info "Please review the rules according to your site policy, and update the check configuration if needed"
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}
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create_config() {
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cat <<EOF
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# shellcheck disable=2034
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status=audit
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# Put here the input allowed protocols, space separated
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# protocol:states
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NFTABLES_INPUT_ALLOWED="tcp:established udp:established icmp:established"
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NFTABLES_OUTPUT_ALLOWED="tcp:established,related,new udp:established,related,new icmp:established,related,new"
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EOF
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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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