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
103 lines
3.2 KiB
Bash
Executable File
103 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 default deny firewall policy (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 default deny firewall policy"
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UFW_DEFAULT_RULES_FILE="/etc/default/ufw"
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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_INPUT_DEFAULT_VALID=1
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UFW_OUTPUT_DEFAULT_VALID=1
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UFW_FORWARD_DEFAULT_VALID=1
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# ufw default rules are configured in /etc/default/ufw
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# easier to parse than ufw output
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local default_policy
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default_policy=$(awk -F '=' '/^[^#]*DEFAULT_INPUT_POLICY/ {print $2}' "$UFW_DEFAULT_RULES_FILE" | sed 's/\"//g')
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if [ "$default_policy" != "DROP" ]; then
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crit "ufw default input policy is $default_policy instead of DROP"
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else
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ok "ufw default input policy is $default_policy"
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UFW_INPUT_DEFAULT_VALID=0
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fi
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default_policy=$(awk -F '=' '/^[^#]*DEFAULT_OUTPUT_POLICY/ {print $2}' "$UFW_DEFAULT_RULES_FILE" | sed 's/\"//g')
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if [ "$default_policy" != "DROP" ]; then
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crit "ufw default output policy is $default_policy instead of DROP"
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else
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ok "ufw default output policy is $default_policy"
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UFW_OUTPUT_DEFAULT_VALID=0
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fi
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default_policy=$(awk -F '=' '/^[^#]*DEFAULT_FORWARD_POLICY/ {print $2}' "$UFW_DEFAULT_RULES_FILE" | sed 's/\"//g')
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if [ "$default_policy" != "DROP" ]; then
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crit "ufw default forward policy is $default_policy instead of DROP"
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else
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ok "ufw default forward policy is $default_policy"
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UFW_FORWARD_DEFAULT_VALID=0
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fi
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if [ "$UFW_INPUT_DEFAULT_VALID" -ne 0 ] || [ "$UFW_OUTPUT_DEFAULT_VALID" -ne 0 ] || [ "$UFW_FORWARD_DEFAULT_VALID" -ne 0 ]; then
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warn "Applying the recommendation will change the default policies to DROP, make sure you have set up the required 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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if [ "$UFW_INPUT_DEFAULT_VALID" -ne 0 ]; then
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info "changing default input policy to DROP"
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ufw default deny incoming
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fi
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if [ "$UFW_OUTPUT_DEFAULT_VALID" -ne 0 ]; then
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info "changing default output policy to DROP"
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ufw default deny outgoing
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fi
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if [ "$UFW_FORWARD_DEFAULT_VALID" -ne 0 ]; then
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info "changing default forward policy to DROP"
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ufw default deny routed
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fi
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}
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# This function will check config parameters required
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check_config() {
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:
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}
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# Source Root Dir Parameter
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if [ -r /etc/default/cis-hardening ]; then
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# shellcheck source=../../debian/default
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. /etc/default/cis-hardening
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fi
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if [ -z "$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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