mirror of
https://github.com/ovh/debian-cis.git
synced 2025-08-05 06:41:16 +02:00
fe1e8b4299
- 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 - nftables_default_deniy_policy.sh -> 4.2.8
90 lines
2.7 KiB
Bash
Executable File
90 lines
2.7 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 default deny firewall policy (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 default deny firewall policy "
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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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INPUT_CHAIN_DROP=1
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OUTPUT_CHAIN_DROP=1
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FORWARD_CHAIN_DROP=1
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if $SUDO_CMD nft list ruleset 2>/dev/null | grep "hook input.*policy drop"; then
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INPUT_CHAIN_DROP=0
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ok "nft base 'input' chain has 'drop' has default policy"
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else
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crit "nft base 'input' chain does not have 'drop' has default policy"
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fi
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if $SUDO_CMD nft list ruleset 2>/dev/null | grep 'hook output.*policy drop'; then
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OUTPUT_CHAIN_DROP=0
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ok "nft base 'output' chain has 'drop' has default policy"
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else
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crit "nft base 'output' chain does not have 'drop' has default policy"
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fi
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if $SUDO_CMD nft list ruleset 2>/dev/null | grep 'hook forward.*policy drop'; then
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FORWARD_CHAIN_DROP=0
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ok "nft base 'forward' chain has 'drop' has default policy"
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else
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crit "nft base 'forward' chain does not have 'drop' has default policy"
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fi
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}
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# This function will be called if the script status is on enabled mode
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apply() {
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audit
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if [ "$INPUT_CHAIN_DROP" -ne 0 ]; then
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info "Please review your default 'input' policy. We wont apply it for you to avoid cutting the branch you are sitting on"
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fi
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if [ "$OUTPUT_CHAIN_DROP" -ne 0 ]; then
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info "Please review your default 'output' policy. We wont apply it for you to avoid cutting the branch you are sitting on"
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fi
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if [ "$FORWARD_CHAIN_DROP" -ne 0 ]; then
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info "Please review your default 'forward' policy. We wont apply it for you to avoid cutting the branch you are sitting on"
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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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