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feat: add debian12 scripts

Browse Source 
- at_is_restricted.sh			-> 2.4.2.1
- wireless_interfaces_disabled.sh	-> 3.1.2
- bluetooth_is_disabled.sh 		-> 3.1.3
- sudo_no_nopasswd.sh 			-> 5.2.4
- aide_is_installed.sh 			-> 6.1.1
This commit is contained in:
damien cavagnini
2025-07-30 10:09:28 +02:00
parent 57aa0e6ef5
commit 532c40d311
12 changed files with 612 additions and 0 deletions
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7
.pre-commit-config.yaml
View File

@@ -22,3 +22,10 @@ repos:
language: script
pass_filenames: true
files: "^(bin|tests)/hardening/"
- id: check_is_executable
name: check_is_executable.sh
description: Ensure checks are executables
entry: hooks/check_is_executable.sh
language: script
pass_filenames: true
files: "^bin/hardening/"

66
bin/hardening/aide_is_installed.sh Executable file
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@@ -0,0 +1,66 @@
#!/bin/bash
# run-shellcheck
#
# CIS Debian Hardening
#
#
# Ensure AIDE is installed (Automated)
#
set -e # One error, it's over
set -u # One variable unset, it's over
# shellcheck disable=2034
HARDENING_LEVEL=3
# shellcheck disable=2034
DESCRIPTION="Ensure AIDE is installed"
PACKAGE="aide"
# This function will be called if the script status is on enabled / audit mode
audit() {
AIDE_INSTALLED=1
is_pkg_installed "$PACKAGE"
if [ "$FNRET" != 0 ]; then
crit "$PACKAGE is absent!"
else
AIDE_INSTALLED=0
ok "$PACKAGE is installed"
fi
}
# This function will be called if the script status is on enabled mode
apply() {
audit
if [ "$AIDE_INSTALLED" -eq 1 ]; then
info "installing '$PACKAGE'"
apt_install "$PACKAGE"
info "'$PACKAGE' installed, please follow the documentation to init and configure it"
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

155
bin/hardening/at_is_restricted.sh Executable file
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@@ -0,0 +1,155 @@
#!/bin/bash
# run-shellcheck
#
# CIS Debian Hardening
#
#
# Ensure at is restricted to authorized users (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 at is restricted to authorized users"
PACKAGE="at"
# This function will be called if the script status is on enabled / audit mode
audit() {
ALLOW_EXISTS=1
ALLOW_VALID=0
DENY_EXISTS=1
DENY_EMPTY=1
DENY_VALID=0
is_pkg_installed "$PACKAGE"
if [ "$FNRET" -eq 1 ]; then
ok "$PACKAGE is not installed"
else
does_file_exist "/etc/at.allow"
if [ "$FNRET" -eq 0 ]; then
ALLOW_EXISTS=0
if [ "$(stat -Lc '%U' /etc/at.allow)" != 'root' ]; then
ALLOW_VALID=1
crit "'/etc/at.allow' is not owned by root"
fi
group="$(stat -Lc '%G' /etc/at.allow)"
if [ "$group" != 'root' ] && [ "$group" != 'daemon' ]; then
ALLOW_VALID=1
crit "'/etc/at.allow' is not owned by group root or group 'daemon'"
fi
if [ "$(stat -Lc '%a' /etc/at.allow)" != '640' ]; then
ALLOW_VALID=1
crit "'/etc/at.allow' perms is not '640'"
fi
fi
does_file_exist "/etc/at.deny"
if [ "$FNRET" -eq 0 ]; then
DENY_EXISTS=0
is_file_empty "/etc/at.deny"
if [ "$FNRET" -eq 0 ]; then
DENY_EMPTY=0
fi
if [ "$(stat -Lc '%U' /etc/at.deny)" != 'root' ]; then
DENY_VALID=1
crit "'/etc/at.deny' is not owned by root"
fi
group="$(stat -Lc '%G' /etc/at.deny)"
if [ "$group" != 'root' ] && [ "$group" != 'daemon' ]; then
DENY_VALID=1
crit "'/etc/at.deny' is not owned by group 'root' or group 'daemon'"
fi
if [ "$(stat -Lc '%a' /etc/at.deny)" != '640' ]; then
DENY_VALID=1
crit "'/etc/at.deny' perms is not '640'"
fi
fi
if [ "$ALLOW_EXISTS" -eq 1 ] && [ "$DENY_EXISTS" -eq 1 ]; then
ok "only superuser is allowed to run 'at' commands"
elif [ "$ALLOW_EXISTS" -eq 1 ] && [ "$DENY_EXISTS" -eq 0 ]; then
if [ "$DENY_EMPTY" -eq 0 ]; then
crit "all users are allowed to execute 'at' commands"
elif [ "$DENY_VALID" -eq 1 ]; then
crit "'/etc/at.deny' exists but is misconfigured"
else
ok "'/etc/at.deny' exists and is well configured"
fi
fi
if [ "$ALLOW_EXISTS" -eq 0 ] && [ "$ALLOW_VALID" -eq 1 ]; then
crit "'/etc/at.allow' exists but is misconfigured"
elif [ "$ALLOW_EXISTS" -eq 0 ] && [ "$ALLOW_VALID" -eq 0 ]; then
ok "'/etc/at.allow' exists and is well configured"
fi
fi
}
# This function will be called if the script status is on enabled mode
apply() {
audit
if [ "$ALLOW_EXISTS" -eq 1 ] && [ "$DENY_EXISTS" -eq 0 ]; then
if [ "$DENY_EMPTY" -eq 0 ]; then
info "Removing '/etc/at.deny'"
rm -f /etc/at.deny
elif [ "$DENY_VALID" -eq 1 ]; then
info "set perms and owner on '/etc/at.deny'"
chmod 0640 /etc/at.deny
chown root /etc/at.deny
if [ "$(stat -Lc '%G' /etc/at.deny)" != "daemon" ]; then
chgrp root /etc/at.deny
fi
fi
fi
if [ "$ALLOW_EXISTS" -eq 0 ] && [ "$ALLOW_VALID" -eq 1 ]; then
info "set perms and owner on '/etc/at.allow'"
chmod 0640 /etc/at.allow
chown root /etc/at.allow
if [ "$(stat -Lc '%G' /etc/at.allow)" != "daemon" ]; then
chgrp root /etc/at.allow
fi
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

91
bin/hardening/bluetooth_is_disabled.sh Executable file
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@@ -0,0 +1,91 @@
#!/bin/bash
# run-shellcheck
#
# CIS Debian Hardening
#
#
# Ensure bluetooth services are not in use (Automated)
#
set -e # One error, it's over
set -u # One variable unset, it's over
# shellcheck disable=2034
HARDENING_LEVEL=3
# shellcheck disable=2034
DESCRIPTION="Ensure bluetooth services are not in use."
PACKAGE='bluez'
SERVICE="bluetooth.service"
# 2 scenario here:
# - bluez is a dependency for another package -> disable the service
# - bluez is not a dependency for another package -> remove the package
# This function will be called if the script status is on enabled / audit mode
audit() {
# 0 means true in bash
PACKAGE_INSTALLED=1
PACKAGE_IS_DEPENDENCY=1
SERVICE_ENABLED=1
is_pkg_installed "$PACKAGE"
[ "$FNRET" = 0 ] && PACKAGE_INSTALLED=0 # 0 means true in bash
is_pkg_a_dependency "$PACKAGE"
# dnsmasq is installed with dnsmasq-base, which
[ "$FNRET" = 0 ] && PACKAGE_IS_DEPENDENCY=0
is_service_enabled "$SERVICE"
[ "$FNRET" = 0 ] && SERVICE_ENABLED=0
if [ "$PACKAGE_INSTALLED" -eq 0 ] && [ "$PACKAGE_IS_DEPENDENCY" -eq 1 ]; then
crit "$PACKAGE is installed and not a dependency"
elif [ "$PACKAGE_INSTALLED" -eq 0 ] && [ "$PACKAGE_IS_DEPENDENCY" -eq 0 ] && [ "$SERVICE_ENABLED" -eq 0 ]; then
crit "$SERVICE is enabled"
else
ok "$PACKAGE is not in use"
fi
}
# This function will be called if the script status is on enabled mode
apply() {
audit
if [ "$PACKAGE_INSTALLED" -eq 0 ] && [ "$PACKAGE_IS_DEPENDENCY" -eq 1 ]; then
crit "$PACKAGE is installed and not a dependency, removing it"
apt_remove "$PACKAGE" -y
apt-get autoremove -y
elif [ "$PACKAGE_INSTALLED" -eq 0 ] && [ "$PACKAGE_IS_DEPENDENCY" -eq 0 ] && [ "$SERVICE_ENABLED" -eq 0 ] && [ "$IS_CONTAINER" -eq 1 ]; then
crit "$SERVICE is enabled, i'm going to stop and mask it"
systemctl stop "$SERVICE"
systemctl mask "$SERVICE"
else
ok "$PACKAGE is not in use"
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

59
bin/hardening/sudo_no_nopasswd.sh Executable file
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@@ -0,0 +1,59 @@
#!/bin/bash
# run-shellcheck
#
# CIS Debian Hardening
#
#
# Ensure users must provide password for privilege escalation (Manual)
#
set -e # One error, it's over
set -u # One variable unset, it's over
# shellcheck disable=2034
HARDENING_LEVEL=3
# shellcheck disable=2034
DESCRIPTION="Ensure users must provide password for privilege escalation "
# This function will be called if the script status is on enabled / audit mode
audit() {
sudo_nopasswd=$($SUDO_CMD grep -HR NOPASSWD /etc/sudoers*)
if [ "$(wc -l <<<"$sudo_nopasswd")" -gt 0 ]; then
crit "There are sudo commands with NOPASSWD: \n$sudo_nopasswd"
else
ok "There are no NOPASSWD sudo commands"
fi
}
# This function will be called if the script status is on enabled mode
apply() {
audit
info "Please review and fix sudo commmands manually if needed"
}
# This function will check config parameters required
check_config() {
:
}
# Source Root Dir Parameter
if [ -r /etc/default/cis-hardening ]; then
# shellcheck source=../../debian/default
. /etc/default/cis-hardening
fi
if [ -z "$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

81
bin/hardening/wireless_interfaces_disabled.sh Executable file
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@@ -0,0 +1,81 @@
#!/bin/bash
# run-shellcheck
#
# CIS Debian Hardening
#
#
# Ensure wireless interfaces are disabled (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 wireless interfaces are disabled"
# This function will be called if the script status is on enabled / audit mode
audit() {
AVAILABLE_MODULES=""
wireless_drivers=$(find /sys/class/net/*/ -type d -name wireless)
if [ "$(wc -w <<<"$wireless_drivers")" -gt 0 ]; then
# not the most readable syntax, took as is from the CIS pdf (just changed the vars name)
for module in $(for wireless_driver in $(find /sys/class/net/*/ -type d -name wireless | xargs -0 dirname); do readlink -f "$wireless_driver"/device/driver/module; done); do
is_kernel_module_available "$module"
if [ "$FNRET" -eq 0 ]; then
# is available in kernel config, but may be disabled in modprobe
is_kernel_module_disabled "$module"
if [ "$FNRET" -eq 1 ]; then
AVAILABLE_MODULES="$AVAILABLE_MODULES $module"
fi
fi
done
fi
if [ -n "$AVAILABLE_MODULES" ]; then
crit "There are some wireless modules available: $AVAILABLE_MODULES"
else
ok "There are no wireless modules available"
fi
}
# This function will be called if the script status is on enabled mode
apply() {
audit
for module in $AVAILABLE_MODULES ]; do
echo "install $module /bin/true" >>/etc/modprobe.d/"$module".conf
info "$module has been disabled in modprobe configuration"
done
}
# This function will check config parameters required
check_config() {
:
}
# Source Root Dir Parameter
if [ -r /etc/default/cis-hardening ]; then
# shellcheck source=../../debian/default
. /etc/default/cis-hardening
fi
if [ -z "$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

7
hooks/check_is_executable.sh Executable file
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@@ -0,0 +1,7 @@
#!/bin/bash
for script in "$@"; do
chmod +x "$script"
done
exit 0

20
tests/hardening/aide_is_installed.sh Normal file
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@@ -0,0 +1,20 @@
# shellcheck shell=bash
# run-shellcheck
test_audit() {
describe Running on blank host
register_test retvalshouldbe 1
# shellcheck disable=2154
run blank "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
describe Fixing situation
sed -i 's/audit/enabled/' "${CIS_CONF_DIR}/conf.d/${script}.cfg"
"${CIS_CHECKS_DIR}/${script}.sh" || true
describe Checking resolved state
register_test retvalshouldbe 0
run resolved "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
describe Clean installation
apt remove -y aide
apt autoremove -y
}

71
tests/hardening/at_is_restricted.sh Normal file
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@@ -0,0 +1,71 @@
# shellcheck shell=bash
# run-shellcheck
test_audit() {
describe prepare test
rm -f /etc/at.allow
apt install -y at
# at package is going to provide at.deny with default content
describe Running on blank host
register_test retvalshouldbe 0
# shellcheck disable=2154
run blank "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
describe Prepare failing test at.deny
# wrong perm
chmod 0644 /etc/at.deny
describe Running failed test at.deny
register_test retvalshouldbe 1
run failure "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
describe Correcting situation
sed -i 's/audit/enabled/' "${CIS_CONF_DIR}/conf.d/${script}.cfg"
"${CIS_CHECKS_DIR}/${script}.sh" || true
describe Running success test at.deny
register_test retvalshouldbe 0
run success "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
describe Prepare failing test at.deny
# empty file + at.allow inexistent = all users allowed
# shellcheck disable=2188
>/etc/at.deny
describe Running failed test at.deny
register_test retvalshouldbe 1
run failure "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
describe Correcting situation
"${CIS_CHECKS_DIR}/${script}.sh" || true
describe Running success test at.deny
register_test retvalshouldbe 0
run success "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
describe Prepare failing test at.allow
touch /etc/at.allow
# wrong user
chown secaudit:root /etc/at.allow
describe Running failed test at.allow
register_test retvalshouldbe 1
run failure "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
describe Correcting situation
"${CIS_CHECKS_DIR}/${script}.sh" || true
describe Running success test at.allow
register_test retvalshouldbe 0
run success "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
describe cleanup at
apt remove -y at
apt autoremove -y
rm -f /etc/allow
describe Running success at package missing
register_test retvalshouldbe 0
run success "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
}

36
tests/hardening/bluetooth_is_disabled.sh Normal file
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@@ -0,0 +1,36 @@
# shellcheck shell=bash
# run-shellcheck
test_audit() {
describe Prepare on purpose failed test
apt install -y bluez
# running on a container, will can only test the package installation, not the service management
describe Running on purpose failed test
register_test retvalshouldbe 1
# shellcheck disable=2154
run failed "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
describe correcting situation
sed -i 's/audit/enabled/' "${CIS_CONF_DIR}/conf.d/${script}.cfg"
"${CIS_CHECKS_DIR}/${script}.sh" --apply || true
describe Checking resolved state
register_test retvalshouldbe 0
run resolved "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
describe Prepare test package dependencies
# try to install a package that depends on 'bluez'
apt install -y bluez-test-tools
# running on a container, we can only test the package installation, not the service management
describe Running successfull test
register_test retvalshouldbe 0
# shellcheck disable=2154
run blank "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
describe clean installation
apt remove -y bluez-test-tools bluez
apt autoremove -y
}

9
tests/hardening/sudo_no_nopasswd.sh Normal file
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@@ -0,0 +1,9 @@
# shellcheck shell=bash
# run-shellcheck
test_audit() {
describe Running on blank host
# we are providing a "NOPASSWD" sudoers for cis tests
register_test retvalshouldbe 1
# shellcheck disable=2154
run blank "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
}

10
tests/hardening/wireless_interfaces_disabled.sh Normal file
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@@ -0,0 +1,10 @@
# shellcheck shell=bash
# run-shellcheck
test_audit() {
describe Running on blank host
register_test retvalshouldbe 0
dismiss_count_for_test
# shellcheck disable=2154
run blank "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
}