mirror of
https://github.com/ovh/debian-cis.git
synced 2025-09-03 13:18:21 +02:00
Damcava35/deb12 scripts 10 (#294)
* fix ssh related tests As letting sshd active will mess with others scripts later * feat: add debian12 scripts - 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 --------- Co-authored-by: damien cavagnini <damien.cavagnini@corp.ovh.com>
This commit is contained in:
damcav35
73
bin/hardening/iptables_flushed_with_nftables.sh
Executable file
73
bin/hardening/iptables_flushed_with_nftables.sh
Executable file
@@ -0,0 +1,73 @@
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#!/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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||||
#
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# Ensure iptables are flushed with nftables (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="if running nftables, we don't want to mix rules with iptables"
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PACKAGE="nftables"
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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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IPTABLES_CHAIN_EMPTY=0
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is_pkg_installed "$PACKAGE"
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if [ "$FNRET" -eq 0 ]; then
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for chain in INPUT OUTPUT FORWARD; do
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# ex of empty INPUT chain: "-P INPUT ACCEPT"
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# shellcheck disable=2046
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if [ $($SUDO_CMD iptables -S "$chain" 2>/dev/null | wc -l) -gt 1 ]; then
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IPTABLES_CHAIN_EMPTY=1
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crit "nftables is installed, but iptables '$chain' rules are not empty"
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else
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ok "nftables is installed and iptables '$chain' rules are empty"
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fi
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done
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fi
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}
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# This function will be called if the script status is on enabled mode
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apply() {
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if [ "$IPTABLES_CHAIN_EMPTY" -ne 0 ]; then
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info "Please review the 'iptables' rules, and either move them to 'nftables', or disable this check"
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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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92
bin/hardening/nftables_established_connections.sh
Executable file
92
bin/hardening/nftables_established_connections.sh
Executable file
@@ -0,0 +1,92 @@
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#!/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
|
||||
check_config() {
|
||||
:
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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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94
bin/hardening/nftables_loopback_is_configured.sh
Executable file
94
bin/hardening/nftables_loopback_is_configured.sh
Executable file
@@ -0,0 +1,94 @@
|
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#!/bin/bash
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||||
|
||||
# run-shellcheck
|
||||
#
|
||||
# CIS Debian Hardening
|
||||
#
|
||||
|
||||
#
|
||||
# Ensure nftables loopback traffic is configured (Automated)
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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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|
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# shellcheck disable=2034
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HARDENING_LEVEL=2
|
||||
# shellcheck disable=2034
|
||||
DESCRIPTION="Ensure nftables loopback traffic is configured"
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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_LOOPBACK=1
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NFTABLES_LOOPBACK_DROP=1
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NFTABLES_IPV6_LOOPBACK_DROP=1
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|
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if nft list ruleset 2>/dev/null | awk '/hook input/,/}/' | grep 'iif "lo" accept'; then
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NFTABLES_LOOPBACK=0
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ok "loopback is configured for nftables"
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||||
else
|
||||
crit "loopback is not configured for nftables"
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||||
fi
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||||
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if nft list ruleset 2>/dev/null | awk '/hook input/,/}/' | grep "ip saddr 127.0.0.1.*drop"; then
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NFTABLES_LOOPBACK_DROP=0
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||||
ok "nftables input loopack traffic is dropped"
|
||||
else
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||||
crit "nftables input loopack traffic 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 nft list ruleset 2>/dev/null | awk '/hook input/,/}/' | grep "ip6 saddr ::1.*drop"; then
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NFTABLES_IPV6_LOOPBACK_DROP=0
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ok "nftables input loopack traffic is dropped"
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else
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crit "nftables input loopack traffic 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 [ "$NFTABLES_LOOPBACK" -ne 0 ]; then
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info "adding nftables loopback configuration"
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nft add rule inet filter input iif lo accept
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fi
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|
||||
if [ "$NFTABLES_LOOPBACK_DROP" -ne 0 ]; then
|
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info "adding nftables loopback drop configuration"
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nft create rule inet filter input ip saddr 127.0.0.0/8 counter drop
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fi
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||||
|
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is_ipv6_enabled
|
||||
if [ "$FNRET" -eq 0 ] && [ "$NFTABLES_IPV6_LOOPBACK_DROP" -ne 0 ]; then
|
||||
info "adding nftables ipv6 loopback drop configuration"
|
||||
nft add rule inet filter input ip6 saddr ::1 counter drop
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||||
fi
|
||||
}
|
||||
|
||||
# This function will check config parameters required
|
||||
check_config() {
|
||||
:
|
||||
}
|
||||
|
||||
# Source Root Dir Parameter
|
||||
if [ -r /etc/default/cis-hardening ]; then
|
||||
# shellcheck source=../../debian/default
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. /etc/default/cis-hardening
|
||||
fi
|
||||
|
||||
if [ -z "$CIS_LIB_DIR" ]; then
|
||||
echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
|
||||
echo "Cannot source CIS_LIB_DIR variable, aborting."
|
||||
exit 128
|
||||
fi
|
||||
|
||||
# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
|
||||
if [ -r "${CIS_LIB_DIR}"/main.sh ]; then
|
||||
# shellcheck source=../../lib/main.sh
|
||||
. "${CIS_LIB_DIR}"/main.sh
|
||||
else
|
||||
echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_LIB_DIR in /etc/default/cis-hardening"
|
||||
exit 128
|
||||
fi
|
||||
102
bin/hardening/ufw_default_deny.sh
Executable file
102
bin/hardening/ufw_default_deny.sh
Executable file
@@ -0,0 +1,102 @@
|
||||
#!/bin/bash
|
||||
|
||||
# run-shellcheck
|
||||
#
|
||||
# CIS Debian Hardening
|
||||
#
|
||||
|
||||
#
|
||||
# Ensure ufw default deny firewall policy (Automated)
|
||||
#
|
||||
|
||||
set -e # One error, it's over
|
||||
set -u # One variable unset, it's over
|
||||
|
||||
# shellcheck disable=2034
|
||||
HARDENING_LEVEL=2
|
||||
# shellcheck disable=2034
|
||||
DESCRIPTION="Ensure ufw default deny firewall policy"
|
||||
UFW_DEFAULT_RULES_FILE="/etc/default/ufw"
|
||||
|
||||
# This function will be called if the script status is on enabled / audit mode
|
||||
audit() {
|
||||
UFW_INPUT_DEFAULT_VALID=1
|
||||
UFW_OUTPUT_DEFAULT_VALID=1
|
||||
UFW_FORWARD_DEFAULT_VALID=1
|
||||
|
||||
# ufw default rules are configured in /etc/default/ufw
|
||||
# easier to parse than ufw output
|
||||
local default_policy
|
||||
default_policy=$(awk -F '=' '/^[^#]*DEFAULT_INPUT_POLICY/ {print $2}' "$UFW_DEFAULT_RULES_FILE" | sed 's/\"//g')
|
||||
if [ "$default_policy" != "DROP" ]; then
|
||||
crit "ufw default input policy is $default_policy instead of DROP"
|
||||
else
|
||||
ok "ufw default input policy is $default_policy"
|
||||
UFW_INPUT_DEFAULT_VALID=0
|
||||
fi
|
||||
|
||||
default_policy=$(awk -F '=' '/^[^#]*DEFAULT_OUTPUT_POLICY/ {print $2}' "$UFW_DEFAULT_RULES_FILE" | sed 's/\"//g')
|
||||
if [ "$default_policy" != "DROP" ]; then
|
||||
crit "ufw default output policy is $default_policy instead of DROP"
|
||||
else
|
||||
ok "ufw default output policy is $default_policy"
|
||||
UFW_OUTPUT_DEFAULT_VALID=0
|
||||
fi
|
||||
|
||||
default_policy=$(awk -F '=' '/^[^#]*DEFAULT_FORWARD_POLICY/ {print $2}' "$UFW_DEFAULT_RULES_FILE" | sed 's/\"//g')
|
||||
if [ "$default_policy" != "DROP" ]; then
|
||||
crit "ufw default forward policy is $default_policy instead of DROP"
|
||||
else
|
||||
ok "ufw default forward policy is $default_policy"
|
||||
UFW_FORWARD_DEFAULT_VALID=0
|
||||
fi
|
||||
|
||||
if [ "$UFW_INPUT_DEFAULT_VALID" -ne 0 ] || [ "$UFW_OUTPUT_DEFAULT_VALID" -ne 0 ] || [ "$UFW_FORWARD_DEFAULT_VALID" -ne 0 ]; then
|
||||
warn "Applying the recommendation will change the default policies to DROP, make sure you have set up the required rules"
|
||||
fi
|
||||
|
||||
}
|
||||
|
||||
# This function will be called if the script status is on enabled mode
|
||||
apply() {
|
||||
if [ "$UFW_INPUT_DEFAULT_VALID" -ne 0 ]; then
|
||||
info "changing default input policy to DROP"
|
||||
ufw default deny incoming
|
||||
fi
|
||||
|
||||
if [ "$UFW_OUTPUT_DEFAULT_VALID" -ne 0 ]; then
|
||||
info "changing default output policy to DROP"
|
||||
ufw default deny outgoing
|
||||
fi
|
||||
|
||||
if [ "$UFW_FORWARD_DEFAULT_VALID" -ne 0 ]; then
|
||||
info "changing default forward policy to DROP"
|
||||
ufw default deny routed
|
||||
fi
|
||||
|
||||
}
|
||||
|
||||
# This function will check config parameters required
|
||||
check_config() {
|
||||
:
|
||||
}
|
||||
|
||||
# Source Root Dir Parameter
|
||||
if [ -r /etc/default/cis-hardening ]; then
|
||||
# shellcheck source=../../debian/default
|
||||
. /etc/default/cis-hardening
|
||||
fi
|
||||
if [ -z "$CIS_LIB_DIR" ]; then
|
||||
echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
|
||||
echo "Cannot source CIS_LIB_DIR variable, aborting."
|
||||
exit 128
|
||||
fi
|
||||
|
||||
# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
|
||||
if [ -r "${CIS_LIB_DIR}"/main.sh ]; then
|
||||
# shellcheck source=../../lib/main.sh
|
||||
. "${CIS_LIB_DIR}"/main.sh
|
||||
else
|
||||
echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_LIB_DIR in /etc/default/cis-hardening"
|
||||
exit 128
|
||||
fi
|
||||
111
bin/hardening/ufw_loopback_is_configured.sh
Executable file
111
bin/hardening/ufw_loopback_is_configured.sh
Executable file
@@ -0,0 +1,111 @@
|
||||
#!/bin/bash
|
||||
|
||||
# run-shellcheck
|
||||
#
|
||||
# CIS Debian Hardening
|
||||
#
|
||||
|
||||
#
|
||||
# Ensure ufw loopback traffic is configured (Automated)
|
||||
#
|
||||
|
||||
set -e # One error, it's over
|
||||
set -u # One variable unset, it's over
|
||||
|
||||
# shellcheck disable=2034
|
||||
HARDENING_LEVEL=2
|
||||
# shellcheck disable=2034
|
||||
DESCRIPTION="Ensure ufw loopback traffic is configured"
|
||||
UFW_RULES_FILE="/etc/ufw/user.rules"
|
||||
UFW_IPV6_RULES_FILE="/etc/ufw/user6.rules"
|
||||
|
||||
# This function will be called if the script status is on enabled / audit mode
|
||||
audit() {
|
||||
UFW_LOOPBACK_INPUT=1
|
||||
UFW_LOOPBACK_OUTPUT=1
|
||||
UFW_LOOPBACK_DENY=1
|
||||
UFW_LOOPBACK_DENY_IPV6=1
|
||||
|
||||
# rules are saved in /etc/ufw/user.rules
|
||||
# easier to parse than ufw output
|
||||
if $SUDO_CMD grep "^[^#]*-[A,I].*input -i lo -j ACCEPT" "$UFW_RULES_FILE" >/dev/null 2>&1; then
|
||||
UFW_LOOPBACK_INPUT=0
|
||||
ok "ufw loopback input is configured"
|
||||
else
|
||||
crit "ufw loopback input is not configured"
|
||||
fi
|
||||
|
||||
if $SUDO_CMD grep "^[^#]*-[A,I].*output -o lo -j ACCEPT" "$UFW_RULES_FILE" >/dev/null 2>&1; then
|
||||
UFW_LOOPBACK_OUTPUT=0
|
||||
ok "ufw loopback output is configured"
|
||||
else
|
||||
crit "ufw loopback output is not configured"
|
||||
fi
|
||||
|
||||
if $SUDO_CMD grep "^[^#]*-[A,I].*input -s 127.0.0.0/8 -j DROP" "$UFW_RULES_FILE" >/dev/null 2>&1; then
|
||||
UFW_LOOPBACK_DENY=0
|
||||
ok "ufw traffic from 127.0.0.0/8 is dropped"
|
||||
else
|
||||
crit "ufw traffic 127.0.0.0/8 is not dropped"
|
||||
fi
|
||||
|
||||
is_ipv6_enabled
|
||||
if [ "$FNRET" -eq 0 ]; then
|
||||
if $SUDO_CMD grep "^[^#]*-[A,I].*input -s ::1 -j DROP" "$UFW_IPV6_RULES_FILE" >/dev/null 2>&1; then
|
||||
UFW_LOOPBACK_DENY_IPV6=0
|
||||
ok "ufw traffic from ipv6 ::1 is dropped"
|
||||
else
|
||||
crit "ufw traffic from ipv6 ::1 is not dropped"
|
||||
fi
|
||||
fi
|
||||
}
|
||||
|
||||
# This function will be called if the script status is on enabled mode
|
||||
apply() {
|
||||
if [ "$UFW_LOOPBACK_INPUT" -ne 0 ]; then
|
||||
info "adding ufw rule to allow loopback input"
|
||||
ufw allow in on lo
|
||||
fi
|
||||
|
||||
if [ "$UFW_LOOPBACK_OUTPUT" -ne 0 ]; then
|
||||
info "adding ufw rule to allow loopback output"
|
||||
ufw allow out on lo
|
||||
fi
|
||||
|
||||
if [ "$UFW_LOOPBACK_DENY" -ne 0 ]; then
|
||||
info "adding ufw rule to drop traffic from 127.0.0.0/8"
|
||||
ufw ufw deny in from 127.0.0.0/8
|
||||
fi
|
||||
|
||||
is_ipv6_enabled
|
||||
if [ "$FNRET" -eq 0 ] && [ "$UFW_LOOPBACK_DENY_IPV6" -ne 0 ]; then
|
||||
info "adding ufw rule to drop traffic from ::1"
|
||||
ufw ufw deny in from ::1
|
||||
fi
|
||||
|
||||
}
|
||||
|
||||
# This function will check config parameters required
|
||||
check_config() {
|
||||
:
|
||||
}
|
||||
|
||||
# Source Root Dir Parameter
|
||||
if [ -r /etc/default/cis-hardening ]; then
|
||||
# shellcheck source=../../debian/default
|
||||
. /etc/default/cis-hardening
|
||||
fi
|
||||
if [ -z "$CIS_LIB_DIR" ]; then
|
||||
echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
|
||||
echo "Cannot source CIS_LIB_DIR variable, aborting."
|
||||
exit 128
|
||||
fi
|
||||
|
||||
# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
|
||||
if [ -r "${CIS_LIB_DIR}"/main.sh ]; then
|
||||
# shellcheck source=../../lib/main.sh
|
||||
. "${CIS_LIB_DIR}"/main.sh
|
||||
else
|
||||
echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_LIB_DIR in /etc/default/cis-hardening"
|
||||
exit 128
|
||||
fi
|
||||
85
bin/hardening/ufw_outbound_connection.sh
Executable file
85
bin/hardening/ufw_outbound_connection.sh
Executable file
@@ -0,0 +1,85 @@
|
||||
#!/bin/bash
|
||||
|
||||
# run-shellcheck
|
||||
#
|
||||
# CIS Debian Hardening
|
||||
#
|
||||
|
||||
#
|
||||
# Ensure ufw outbound connections are configured (Manual)
|
||||
#
|
||||
|
||||
set -e # One error, it's over
|
||||
set -u # One variable unset, it's over
|
||||
|
||||
# shellcheck disable=2034
|
||||
HARDENING_LEVEL=2
|
||||
# shellcheck disable=2034
|
||||
DESCRIPTION="Ensure ufw outbound connections are configured"
|
||||
UFW_RULES_FILE="/etc/ufw/user.rules"
|
||||
# variable defined in config file
|
||||
ALLOW_OUTBOUND_ALL=""
|
||||
|
||||
# This function will be called if the script status is on enabled / audit mode
|
||||
audit() {
|
||||
UFW_RULE_IS_VALID=1
|
||||
# rules are saved in /etc/ufw/user.rules
|
||||
# easier to parse than ufw output
|
||||
if $SUDO_CMD grep "^[^#]*-[A,I].*output -o all -j ACCEPT" "$UFW_RULES_FILE" >/dev/null 2>&1; then
|
||||
if [ "$ALLOW_OUTBOUND_ALL" -eq 0 ]; then
|
||||
UFW_RULE_IS_VALID=0
|
||||
ok "ufw output is allowed for all"
|
||||
else
|
||||
crit "ufw output is allowed for all, and ALLOW_OUTBOUND_ALL=1"
|
||||
fi
|
||||
else
|
||||
if [ "$ALLOW_OUTBOUND_ALL" -eq 1 ]; then
|
||||
UFW_RULE_IS_VALID=0
|
||||
ok "ufw output is not allowed for all"
|
||||
else
|
||||
crit "ufw output is not allowed for all, and ALLOW_OUTBOUND_ALL=0"
|
||||
fi
|
||||
fi
|
||||
}
|
||||
|
||||
# This function will be called if the script status is on enabled mode
|
||||
apply() {
|
||||
if [ "$UFW_RULE_IS_VALID" -ne 0 ]; then
|
||||
info "Please review the output rules according to your site policy, and update 'ALLOW_OUTBOUND_ALL' in configuration accordingly"
|
||||
fi
|
||||
}
|
||||
|
||||
create_config() {
|
||||
cat <<EOF
|
||||
# shellcheck disable=2034
|
||||
status=audit
|
||||
# ALLOW_OUTBOUND_ALL=0 means true, we want the rule to be present
|
||||
# ALLOW_OUTBOUND_ALL=1 means false, we don't want the rule to be present
|
||||
ALLOW_OUTBOUND_ALL=0
|
||||
EOF
|
||||
}
|
||||
|
||||
# This function will check config parameters required
|
||||
check_config() {
|
||||
:
|
||||
}
|
||||
|
||||
# Source Root Dir Parameter
|
||||
if [ -r /etc/default/cis-hardening ]; then
|
||||
# shellcheck source=../../debian/default
|
||||
. /etc/default/cis-hardening
|
||||
fi
|
||||
if [ -z "$CIS_LIB_DIR" ]; then
|
||||
echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
|
||||
echo "Cannot source CIS_LIB_DIR variable, aborting."
|
||||
exit 128
|
||||
fi
|
||||
|
||||
# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
|
||||
if [ -r "${CIS_LIB_DIR}"/main.sh ]; then
|
||||
# shellcheck source=../../lib/main.sh
|
||||
. "${CIS_LIB_DIR}"/main.sh
|
||||
else
|
||||
echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_LIB_DIR in /etc/default/cis-hardening"
|
||||
exit 128
|
||||
fi
|
||||
74
bin/hardening/ufw_rules_them_all.sh
Executable file
74
bin/hardening/ufw_rules_them_all.sh
Executable file
@@ -0,0 +1,74 @@
|
||||
#!/bin/bash
|
||||
|
||||
# run-shellcheck
|
||||
#
|
||||
# CIS Debian Hardening
|
||||
#
|
||||
|
||||
#
|
||||
# Ensure ufw firewall rules exist for all open ports (Manual)
|
||||
#
|
||||
|
||||
set -e # One error, it's over
|
||||
set -u # One variable unset, it's over
|
||||
|
||||
# shellcheck disable=2034
|
||||
HARDENING_LEVEL=2
|
||||
# shellcheck disable=2034
|
||||
DESCRIPTION="Ensure ufw firewall rules exist for all open ports"
|
||||
|
||||
# This function will be called if the script status is on enabled / audit mode
|
||||
audit() {
|
||||
UFW_IS_VALID=0
|
||||
local ufw_ports_rules
|
||||
local listening_ports
|
||||
|
||||
ufw_ports_rules=$($SUDO_CMD ufw status verbose 2>/dev/null | grep -Po '^\h*\d+\b' | sort -u)
|
||||
listening_ports=$($SUDO_CMD ss -tuln | awk '($5!~/%lo:/ && $5!~/127.0.0.1:/ && $5!~/\[?::1\]?:/) {split($5, a, ":"); print a[2]}' | sort -u)
|
||||
|
||||
for port in $listening_ports; do
|
||||
if ! grep "$port" <<<"$ufw_ports_rules"; then
|
||||
crit "$port does not have an ufw rule"
|
||||
UFW_IS_VALID=1
|
||||
fi
|
||||
done
|
||||
|
||||
if [ "$UFW_IS_VALID" -eq 0 ]; then
|
||||
ok "all listening ports have a corresponding rule in ufw"
|
||||
fi
|
||||
}
|
||||
|
||||
# This function will be called if the script status is on enabled mode
|
||||
apply() {
|
||||
if [ "$UFW_IS_VALID" -ne 0 ]; then
|
||||
# Debian 12 CIS marks this script as "Automated", but we wont do it
|
||||
# How can we know if a rule should be allowed or denied ?
|
||||
warn "Please review the ufw rules and update them accordingly"
|
||||
fi
|
||||
|
||||
}
|
||||
|
||||
# This function will check config parameters required
|
||||
check_config() {
|
||||
:
|
||||
}
|
||||
|
||||
# Source Root Dir Parameter
|
||||
if [ -r /etc/default/cis-hardening ]; then
|
||||
# shellcheck source=../../debian/default
|
||||
. /etc/default/cis-hardening
|
||||
fi
|
||||
if [ -z "$CIS_LIB_DIR" ]; then
|
||||
echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
|
||||
echo "Cannot source CIS_LIB_DIR variable, aborting."
|
||||
exit 128
|
||||
fi
|
||||
|
||||
# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
|
||||
if [ -r "${CIS_LIB_DIR}"/main.sh ]; then
|
||||
# shellcheck source=../../lib/main.sh
|
||||
. "${CIS_LIB_DIR}"/main.sh
|
||||
else
|
||||
echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_LIB_DIR in /etc/default/cis-hardening"
|
||||
exit 128
|
||||
fi
|
||||
Reference in New Issue
Block a user