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Current "is_kernel_option_enabled" function is doing many things, like checking for a kernel option AND checking a kernel module state AND checking if it is disabled We split it in different functions: - is_kernel_monolithic - is_kernel_option_enabled -> check for a kernel configuration in the running kernel - is_kernel_module_loaded -> check if a module is currently loaded - is_kernel_module_available -> check if a module is configured in all available kernel configs - is_kernel_module_disabled -> check if a kernel module is disabled in the modprobe configuration Also: - update its behaviour to debian 12 CIS recommendation, to check if a module is "available in ANY installed kernel" - fix "disable_usb_storage" to look for correct module name once loaded : issue #249 - the associated checks now check separately if the module is loaded, and if it is configured - for checks about kernel module presence, the "apply" function now manages to disable the module in the modprobe configuration (if kernel not monolithic) (but still wont unload it) Co-authored-by: Damien Cavagnini <damien.cavagnini@corp.ovh.com>
100 lines
3.3 KiB
Bash
Executable File
100 lines
3.3 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 TIPC is disabled (Not Scored)
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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="Disable Transperent Inter-Process Communication (TIPC)."
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# Note: we check /proc/config.gz to be compliant with both monolithic and modular kernels
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KERNEL_OPTION="CONFIG_TIPC"
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MODULE_NAME="tipc"
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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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if [ "$IS_CONTAINER" -eq 1 ]; then
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# In an unprivileged container, the kernel modules are host dependent, so you should consider enforcing it
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ok "Container detected, consider host enforcing or disable this check!"
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else
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is_kernel_module_loaded "$KERNEL_OPTION" "$MODULE_NAME"
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if [ "$FNRET" -eq 0 ]; then # 0 means true in bash, so it IS activated
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crit "$MODULE_NAME is loaded!"
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else
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ok "$MODULE_NAME is not loaded"
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fi
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if [ "$IS_MONOLITHIC_KERNEL" -eq 1 ]; then
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is_kernel_module_disabled "$MODULE_NAME"
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if [ "$FNRET" -eq 0 ]; then
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ok "$MODULE_NAME is disabled in the modprobe configuration"
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else
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is_kernel_module_available "$KERNEL_OPTION"
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if [ "$FNRET" -eq 0 ]; then
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crit "$MODULE_NAME is available in some kernel config, but not disabled"
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else
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ok "$MODULE_NAME is not available in any kernel config"
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fi
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fi
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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 [ "$IS_CONTAINER" -eq 1 ]; then
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# In an unprivileged container, the kernel modules are host dependent, so you should consider enforcing it
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ok "Container detected, consider host enforcing!"
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else
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is_kernel_module_loaded "$KERNEL_OPTION" "$LOADED_MODULE_NAME"
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if [ "$FNRET" -eq 0 ]; then # 0 means true in bash, so it IS activated
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crit "$LOADED_MODULE_NAME is loaded!"
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warn "I wont unload the module, unload it manually or recompile the kernel if needed"
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fi
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if [ "$IS_MONOLITHIC_KERNEL" -eq 1 ]; then
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is_kernel_module_disabled "$MODULE_NAME"
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if [ "$FNRET" -eq 1 ]; then
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echo "install $MODULE_NAME /bin/true" >>/etc/modprobe.d/"$MODULE_NAME".conf
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info "$MODULE_NAME has been disabled in the modprobe configuration"
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fi
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fi
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fi
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}
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# This function will check config parameters required
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check_config() {
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:
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}
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# Source Root Dir Parameter
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if [ -r /etc/default/cis-hardening ]; then
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# shellcheck source=../../debian/default
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. /etc/default/cis-hardening
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fi
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if [ -z "$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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