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#!/bin/sh
#################################################################################
#
# Lynis
# ------------------
#
# Website : https://cisofy.com
# Blog : http://linux-audit.com
# GitHub : https://github.com/CISOfy/lynis
#
# Lynis comes with ABSOLUTELY NO WARRANTY. This is free software, and you are
# welcome to redistribute it under the terms of the GNU General Public License.
# See LICENSE file for usage of this software.
#
#################################################################################
#
# USB Devices
#
#################################################################################
#
USBGUARD_FOUND=0
USBGUARD_CONFIG=""
USBGUARD_RULES=""
USBGUARD_RESTORE_POLICY=""
USBGUARD_CONTROLLER_POLICY=""
USBGUARD_DEVICE_POLICY=""
USBGUARD_INSERTED_POLICY=""
USBGUARD_DEFAULT_POLICY=""
USBGUARD_RULES_ALLOW=0
USBGUARD_RULES_BLOCK=0
USBGUARD_RULES_REJECT=0
#
#################################################################################
#
InsertSection "USB Devices"
#
#################################################################################
#
# PLACEHOLDER USB-0000 used until a good test name & number can be assigned.
# Once that is done, we are one step closer to being able to enable the
# suggestions below.
# Test : USB-0000
# Description : Perform file permissions check
Register --test-no USB-0000 --os Linux --weight L --network NO --category security --description "Check for presence of USBGuard"
if [ ${SKIPTEST} -eq 0 ]; then
if [ ! -z "${USBGUARDBINARY}" ]; then
USBGUARD_FOUND=1
LogText "Result: USBGuard is installed (${USBGUARDBINARY})"
Display --indent 2 --text "- Checking USBGuard" --result "${STATUS_FOUND}" --color GREEN
AddHP 1 1
LogText "Checking USBGuard configuration file"
if [ -f /etc/usbguard/usbguard-daemon.conf ]; then
USBGUARD_CONFIG="/etc/usbguard/usbguard-daemon.conf"
else
USBGUARD_CONFIG=""
fi
if [ ! -z "${USBGUARD_CONFIG}" ]; then
LogText "Result: USBGuard configuration found (${USBGUARD_CONFIG})"
Display --indent 4 --text "- Configuration" --result "${STATUS_FOUND}" --color GREEN
AddHP 1 1
LogText "Checking USBGuard restore controller device state (RestoreControllerDeviceState)"
USBGUARD_RESTORE_POLICY=$(${AWKBINARY} -F '=' -v OPT="RestoreControllerDeviceState" 'index($0, OPT) == 1 {print $2}' ${USBGUARD_CONFIG})
if [ ! -z "${USBGUARD_RESTORE_POLICY}" ]; then
LogText "Result: RestoreControllerDeviceState = ${USBGUARD_RESTORE_POLICY}"
case "${USBGUARD_RESTORE_POLICY}" in
"true")
Display --indent 6 --text "- Restore controller device state" --result "${USBGUARD_RESTORE_POLICY}" --color YELLOW
LogText " Consider changing RestoreControllerDeviceState to \"false\""
# To-Be-Added: assign TEST_NO, create documentation, and enable the suggestion
# ReportSuggestion ${TEST_NO} "Consider hardening USBGuard configuration" "RestoreControllerDeviceState (${USBGUARD_RESTORE_POLICY} --> false)"
AddHP 0 1
;;
"false")
Display --indent 6 --text "- Restore controller device state" --result "${USBGUARD_RESTORE_POLICY}" --color GREEN
AddHP 1 1
;;
*)
LogText "Result: Invalid configuration for RestoreControllerDeviceState"
Display --indent 6 --text "- Restore controller device state" --result "Invalid" --color RED
# To-Be-Added: assign TEST_NO, create documentation, and enable the suggestion
# ReportSuggestion ${TEST_NO} "Fix USBGuard configuration" "RestoreControllerDeviceState invalid \"${USBGUARD_RESTORE_POLICY}\""
AddHP 0 1
;;
esac
else
LogText "Result: RestoreControllerDeviceState not found"
Display --indent 6 --text "- Restore controller device state" --result "NOT FOUND" --color WHITE
AddHP 0 1
fi
LogText "Checking USBGuard rule for controllers connected before daemon starts (PresentControllerPolicy)"
USBGUARD_CONTROLLER_POLICY=$(${AWKBINARY} -F '=' -v OPT="PresentControllerPolicy" 'index($0, OPT) == 1 {print $2}' ${USBGUARD_CONFIG})
if [ ! -z "${USBGUARD_CONTROLLER_POLICY}" ]; then
LogText "Result: PresentControllerPolicy = ${USBGUARD_CONTROLLER_POLICY}"
case "${USBGUARD_CONTROLLER_POLICY}" in
"allow"|"keep")
Display --indent 6 --text "- Rule for controllers connected before daemon starts" --result "${USBGUARD_CONTROLLER_POLICY}" --color YELLOW
LogText " Consider changing PresentControllerPolicy to \"apply-policy\", \"block\" or \"reject\""
# To-Be-Added: assign TEST_NO, create documentation, and enable the suggestion
# ReportSuggestion ${TEST_NO} "Consider hardening USBGuard configuration" "PresentControllerPolicy (${USBGUARD_CONTROLLER_POLICY} --> (apply-policy|block|reject)"
AddHP 0 1
;;
"apply-policy"|"block"|"reject")
Display --indent 6 --text "- Rule for controllers connected before daemon starts" --result "${USBGUARD_CONTROLLER_POLICY}" --color GREEN
AddHP 1 1
;;
*)
LogText "Result: Invalid configuration for PresentControllerPolicy"
Display --indent 6 --text "- Rule for controllers connected before daemon starts" --result "Invalid" --color RED
# To-Be-Added: assign TEST_NO, create documentation, and enable the suggestion
# ReportSuggestion ${TEST_NO} "Fix USBGuard configuration" "PresentControllerPolicy invalid \"${USBGUARD_CONTROLLER_POLICY}\""
AddHP 0 1
;;
esac
else
LogText "Result: PresentControllerPolicy not found"
Display --indent 6 --text "- Rule for controllers connected before daemon starts" --result "NOT FOUND" --color WHITE
AddHP 0 1
fi
LogText "Checking USBGuard rule for devices connected before daemon starts (PresentDevicePolicy)"
USBGUARD_DEVICE_POLICY=$(${AWKBINARY} -F '=' -v OPT="PresentDevicePolicy" 'index($0, OPT) == 1 {print $2}' ${USBGUARD_CONFIG})
if [ ! -z "${USBGUARD_DEVICE_POLICY}" ]; then
LogText "Result: PresentDevicePolicy = ${USBGUARD_DEVICE_POLICY}"
case "${USBGUARD_DEVICE_POLICY}" in
"allow"|"keep")
Display --indent 6 --text "- Rule for devices connected before daemon starts" --result "${USBGUARD_DEVICE_POLICY}" --color YELLOW
LogText " Consider changing PresentDevicePolicy to \"apply-policy\", \"block\" or \"reject\""
# To-Be-Added: assign TEST_NO, create documentation, and enable the suggestion
# ReportSuggestion ${TEST_NO} "Consider hardening USBGuard configuration" "PresentDevicePolicy (${USBGUARD_DEVICE_POLICY} --> (apply-policy|block|reject)"
AddHP 0 1
;;
"apply-policy"|"block"|"reject")
Display --indent 6 --text "- Rule for devices connected before daemon starts" --result "${USBGUARD_DEVICE_POLICY}" --color GREEN
AddHP 1 1
;;
*)
LogText "Result: Invalid configuration for PresentDevicePolicy"
Display --indent 6 --text "- Rule for devices connected before daemon starts" --result "Invalid" --color RED
# To-Be-Added: assign TEST_NO, create documentation, and enable the suggestion
# ReportSuggestion ${TEST_NO} "Fix USBGuard configuration" "PresentDevicePolicy invalid \"${USBGUARD_DEVICE_POLICY}\""
AddHP 0 1
;;
esac
else
LogText "Result: PresentDevicePolicy not found"
Display --indent 6 --text "- Rule for devices connected before daemon starts" --result "NOT FOUND" --color WHITE
AddHP 0 1
fi
LogText "Checking USBGuard rule for devices inserted after daemon starts (InsertedDevicePolicy)"
USBGUARD_INSERTED_POLICY=$(${AWKBINARY} -F '=' -v OPT="InsertedDevicePolicy" 'index($0, OPT) == 1 {print $2}' ${USBGUARD_CONFIG})
if [ ! -z "${USBGUARD_INSERTED_POLICY}" ]; then
LogText "Result: InsertedDevicePolicy = ${USBGUARD_INSERTED_POLICY}"
case "${USBGUARD_INSERTED_POLICY}" in
"allow"|"keep")
Display --indent 6 --text "- Rule for devices inserted after daemon starts" --result "${USBGUARD_INSERTED_POLICY}" --color YELLOW
LogText " Consider changing InsertedDevicePolicy to \"apply-policy\", \"block\" or \"reject\""
# To-Be-Added: assign TEST_NO, create documentation, and enable the suggestion
# ReportSuggestion ${TEST_NO} "Consider hardening USBGuard configuration" "InsertedDevicePolicy (${USBGUARD_INSERTED_POLICY} --> (apply-policy|block|reject)"
AddHP 0 1
;;
"apply-policy"|"block"|"reject")
Display --indent 6 --text "- Rule for devices inserted after daemon starts" --result "${USBGUARD_INSERTED_POLICY}" --color GREEN
AddHP 1 1
;;
*)
LogText "Result: Invalid configuration for InsertedDevicePolicy"
Display --indent 6 --text "- Rule for devices inserted after daemon starts" --result "Invalid" --color RED
# To-Be-Added: assign TEST_NO, create documentation, and enable the suggestion
# ReportSuggestion ${TEST_NO} "Fix USBGuard configuration" "InsertedDevicePolicy invalid \"${USBGUARD_INSERTED_POLICY}\""
AddHP 0 1
;;
esac
else
LogText "Result: InsertedDevicePolicy not found"
Display --indent 6 --text "- Rule for devices inserted after daemon starts" --result "NOT FOUND" --color WHITE
AddHP 0 1
fi
LogText "Checking USBGuard rule for devices not in RuleFile (ImplicitPolicyTarget)"
USBGUARD_DEFAULT_POLICY=$(${AWKBINARY} -F '=' -v OPT="ImplicitPolicyTarget" 'index($0, OPT) == 1 {print $2}' ${USBGUARD_CONFIG})
if [ ! -z "${USBGUARD_DEFAULT_POLICY}" ]; then
LogText "Result: ImplicitPolicyTarget = ${USBGUARD_DEFAULT_POLICY}"
case "${USBGUARD_DEFAULT_POLICY}" in
"allow")
Display --indent 6 --text "- Rule for devices not in RuleFile" --result "${USBGUARD_DEFAULT_POLICY}" --color YELLOW
LogText " Consider changing ImplicitPolicyTarget to \"block\" or \"reject\""
# To-Be-Added: assign TEST_NO, create documentation, and enable the suggestion
# ReportSuggestion ${TEST_NO} "Consider hardening USBGuard configuration" "ImplicitPolicyTarget (${USBGUARD_DEFAULT_POLICY} --> (block|reject)"
AddHP 0 1
;;
"block"|"reject")
Display --indent 6 --text "- Rule for devices not in RuleFile" --result "${USBGUARD_DEFAULT_POLICY}" --color GREEN
AddHP 1 1
;;
*)
LogText "Result: Invalid configuration for ImplicitPolicyTarget"
Display --indent 6 --text "- Rule for devices not in RuleFile" --result "Invalid" --color RED
# To-Be-Added: assign TEST_NO, create documentation, and enable the suggestion
# ReportSuggestion ${TEST_NO} "Fix USBGuard configuration" "ImplicitPolicyTarget invalid \"${USBGUARD_DEFAULT_POLICY}\""
AddHP 0 1
;;
esac
else
LogText "Result: ImplicitPolicyTarget not found"
Display --indent 4 --text "- Rule for devices not in RuleFile" --result "NOT FOUND" --color WHITE
AddHP 0 1
fi
LogText "Checking RuleFile"
USBGUARD_RULES=$(${AWKBINARY} -F '=' -v OPT="RuleFile" 'index($0, OPT) == 1 {print $2}' ${USBGUARD_CONFIG})
if [ ! -z "${USBGUARD_RULES}" ] && [ -f "${USBGUARD_RULES}" ]; then
LogText "Result: RuleFile found (${USBGUARD_RULES})"
Display --indent 4 --text "- RuleFile" --result "${STATUS_FOUND}" --color GREEN
AddHP 1 1
USBGUARD_RULES_ALLOW=$(${EGREPBINARY} -c "^allow" ${USBGUARD_RULES})
Display --indent 6 --text "- Controllers & Devices allow" --result "${USBGUARD_RULES_ALLOW}" --color WHITE
USBGUARD_RULES_BLOCK=$(${EGREPBINARY} -c "^block" ${USBGUARD_RULES})
Display --indent 6 --text "- Controllers & Devices block" --result "${USBGUARD_RULES_BLOCK}" --color WHITE
USBGUARD_RULES_REJECT=$(${EGREPBINARY} -c "^reject" ${USBGUARD_RULES})
Display --indent 6 --text "- Controllers & Devices reject" --result "${USBGUARD_RULES_REJECT}" --color WHITE
else
LogText "Result: RuleFile not found (\"man usbguard\" for instructions to install initial policies)"
Display --indent 4 --text "- RuleFile" --result "${STATUS_NOT_FOUND}" --color RED
# To-Be-Added: assign TEST_NO, create documentation, and enable the suggestion
ReportSuggestion ${TEST_NO} "Install USBGuard RuleFile" "\"man usbguard\" for instructions to install initial policies"
AddHP 0 1
fi
else
Display --indent 4 --text "- Configuration" --result "${STATUS_NOT_FOUND}" --color WHITE
LogText "Result: Configuration not found"
# To-Be-Added: assign TEST_NO, create documentation, and enable the suggestion
#ReportSuggestion ${TEST_NO} "USBGuard configuration file not found, consider reinstalling"
AddHP 0 7
fi
else
LogText "Result: USBGuard not found"
Display --indent 2 --text "- Checking USBGuard" --result "${STATUS_NOT_FOUND}" --color WHITE
# To-Be-Added: assign TEST_NO, create documentation, and enable the suggestion
#ReportSuggestion ${TEST_NO} "Install USBGuard to allow for fine-grained control of USB authorization"
AddHP 0 8
fi
fi
#
#################################################################################
#
WaitForKeyPress
#
#================================================================================
|
