mirror of
https://github.com/ovh/debian-cis.git
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dfd3773129
- nftables_is_enabled.sh -> 4.2.9 - nftables_has_table.sh -> 4.2.4 - nftables_has_base_chains.sh -> 4.2.5 - nftables_rules_permanent.sh -> 4.2.10
112 lines
3.4 KiB
Bash
Executable File
112 lines
3.4 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 rules are permanent (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 nftables rules are permanent"
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NFTABLES_CONF="/etc/nftables.conf"
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# default to "/etc/nftables.rules"
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# May be changed in config, see "create_config" below
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NFTABLES_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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NFTABLES_INCLUDE=1
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NFTABLES_INCLUDE_INPUT=1
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NFTABLES_INCLUDE_OUTPUT=1
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NFTABLES_INCLUDE_FORWARD=1
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# the CIS recommendation is to have one or many nftables rules outside nftables.conf
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if grep -E '^\s*include' "$NFTABLES_CONF" >/dev/null; then
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NFTABLES_INCLUDE=0
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ok "There is an included file in $NFTABLES_CONF"
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# shellcheck disable=2046
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if [ $(awk '/hook input/,/}/' $(awk '$1 ~ /^\s*include/ { gsub("\"","",$2);print $2 }' $NFTABLES_CONF) | wc -l) -gt 0 ]; then
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NFTABLES_INCLUDE_INPUT=0
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ok "nftables input is configured to be persistent"
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else
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crit "nftables input is not configured to be persistent"
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fi
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# shellcheck disable=2046
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if [ $(awk '/hook forward/,/}/' $(awk '$1 ~ /^\s*include/ { gsub("\"","",$2);print $2 }' $NFTABLES_CONF) | wc -l) -gt 0 ]; then
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NFTABLES_INCLUDE_FORWARD=0
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ok "nftables forward is configured to be persistent"
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else
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crit "nftables forward is not configured to be persistent"
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fi
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# shellcheck disable=2046
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if [ $(awk '/hook output/,/}/' $(awk '$1 ~ /^\s*include/ { gsub("\"","",$2);print $2 }' $NFTABLES_CONF) | wc -l) -gt 0 ]; then
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NFTABLES_INCLUDE_OUTPUT=0
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ok "nftables output is configured to be persistent"
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else
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crit "nftables output is not configured to be persistent"
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fi
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else
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crit "There is no 'include' in $NFTABLES_CONF"
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fi
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}
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# This function will be called if the script status is on enabled mode
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apply() {
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audit
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if [ "$NFTABLES_INCLUDE" -ne 0 ]; then
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add_end_of_file "$NFTABLES_CONF" "include \"$NFTABLES_RULES\""
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fi
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if [ "$NFTABLES_INCLUDE_INPUT" -ne 0 ] || [ "$NFTABLES_INCLUDE_FORWARD" -ne 0 ] || [ "$NFTABLES_INCLUDE_OUTPUT" -ne 0 ]; then
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info "some basic chains are not persisted in $NFTABLES_RULES, please review them manually"
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fi
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}
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create_config() {
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cat <<EOF
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# shellcheck disable=2034
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status=audit
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# Put here the nftables rules file for persistent rules
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NFTABLES_RULES="/etc/nftables.rules"
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EOF
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}
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# This function will check config parameters required
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check_config() {
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:
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}
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# Source Root Dir Parameter
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if [ -r /etc/default/cis-hardening ]; then
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# shellcheck source=../../debian/default
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. /etc/default/cis-hardening
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fi
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if [ -z "$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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