2018-01-24 19:29:50 +01:00
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#!/bin/sh
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#################################################################################
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#
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# Lynis
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# ------------------
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#
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# Website : https://cisofy.com
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# Blog : http://linux-audit.com
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# GitHub : https://github.com/CISOfy/lynis
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#
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# Lynis comes with ABSOLUTELY NO WARRANTY. This is free software, and you are
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# welcome to redistribute it under the terms of the GNU General Public License.
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# See LICENSE file for usage of this software.
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#
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#################################################################################
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#
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# USB Devices
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#
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#################################################################################
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2018-01-26 12:24:33 +01:00
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#
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InsertSection "USB Devices"
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#
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#################################################################################
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2018-01-24 19:29:50 +01:00
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#
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USBGUARD_FOUND=0
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USBGUARD_CONFIG=""
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USBGUARD_RULES=""
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USBGUARD_RESTORE_POLICY=""
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USBGUARD_CONTROLLER_POLICY=""
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USBGUARD_DEVICE_POLICY=""
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USBGUARD_INSERTED_POLICY=""
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USBGUARD_DEFAULT_POLICY=""
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USBGUARD_RULES_ALLOW=0
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USBGUARD_RULES_BLOCK=0
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USBGUARD_RULES_REJECT=0
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#
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#################################################################################
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#
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2018-01-26 12:24:33 +01:00
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# Test to determine if USBGuard is installed. If it is, we will limit
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# suggestions from other tests.
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if [ ! -z "${USBGUARDBINARY}" ]; then
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USBGUARD_FOUND=1
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fi
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2018-01-24 19:29:50 +01:00
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#
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#################################################################################
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#
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2018-01-26 12:36:33 +01:00
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# Test : STRG-1840 (future ID: USB-1200)
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2018-01-26 12:24:33 +01:00
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# Description : Check for disabled USB storage
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2018-01-26 12:36:33 +01:00
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Register --test-no STRG-1840 --os Linux --weight L --network NO --category security --description "Check if USB storage is disabled"
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2018-01-26 12:24:33 +01:00
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if [ ${SKIPTEST} -eq 0 ]; then
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FOUND=0
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LogText "Test: Checking USB storage driver in directory /etc/modprobe.d and configuration file /etc/modprobe.conf"
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if [ -d /etc/modprobe.d ]; then
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FIND=$(${LSBINARY} ${ROOTDIR}etc/modprobe.d/* 2> /dev/null)
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if [ ! -z "${FIND}" ]; then
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FIND=$(${EGREPBINARY} -r "install usb[-_]storage /bin/(false|true)" ${ROOTDIR}etc/modprobe.d/* | ${GREPBINARY} -v "#")
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FIND2=$(${EGREPBINARY} -r "^blacklist usb[-_]storage" ${ROOTDIR}etc/modprobe.d/*)
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if [ ! -z "${FIND}" -o ! -z "${FIND2}" ]; then
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FOUND=1
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LogText "Result: found usb-storage driver in disabled state (blacklisted)"
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fi
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else
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LogText "Result: uncommon situation. Found /etc/modprobe.d directory, but no files in it."
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fi
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fi
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if [ -f ${ROOTDIR}etc/modprobe.conf ]; then
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FIND=$(${EGREPBINARY} "install usb[-_]storage /bin/(false|true)" ${ROOTDIR}etc/modprobe.conf | ${GREPBINARY} "usb-storage" | ${GREPBINARY} -v "#")
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if [ ! -z "${FIND}" ]; then
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FOUND=1
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LogText "Result: found usb-storage driver in disabled state"
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fi
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fi
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if [ ${FOUND} -eq 0 ]; then
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LogText "Result: usb-storage driver is not explicitly disabled"
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Display --indent 2 --text "- Checking usb-storage driver (modprobe config)" --result "NOT DISABLED" --color WHITE
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if [ "${USBGUARD_FOUND}" -eq "0" ]; then
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ReportSuggestion ${TEST_NO} "Disable drivers like USB storage when not used, to prevent unauthorized storage or data theft"
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fi
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AddHP 2 3
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else
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LogText "Result: usb-storage driver is disabled"
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Display --indent 2 --text "- Checking usb-storage driver (modprobe config)" --result "${STATUS_DISABLED}" --color GREEN
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AddHP 3 3
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fi
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fi
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#
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#################################################################################
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#
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2018-01-26 12:36:33 +01:00
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# Test : STRG-1842 (future ID: USB-2000)
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2018-01-26 12:24:33 +01:00
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# Description : Check USB authorizations
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2018-01-26 12:36:33 +01:00
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Register --test-no STRG-1842 --os Linux --weight L --network NO --category security --description "Check USB authorizations"
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2018-01-24 19:29:50 +01:00
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if [ ${SKIPTEST} -eq 0 ]; then
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2018-01-26 12:24:33 +01:00
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LogText "Test: Checking USB devices authorization to connect to the system"
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FOUND=0
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USBDEVICESPATH="/sys/bus/usb/devices/usb"
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for device in "${USBDEVICESPATH}"*; do
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if [ -e "${device}/authorized" ] || [ -e "${device}/authorized_default" ]; then
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if [ $(cat "${device}/authorized_default") -eq 1 ]; then
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FOUND=1
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LogText "Test: ${device} is authorized by default"
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Report "usb_authorized_default_device[]=${device}"
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elif [ $(cat "${device}/authorized") -eq 1 ]; then
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FOUND=1
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LogText "Test: ${device} is authorized currently"
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Report "usb_authorized_device[]=${device}"
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fi
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fi
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done
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2018-01-24 19:29:50 +01:00
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2018-01-26 12:24:33 +01:00
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if [ ${FOUND} -eq 1 ]; then
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LogText "Result: Some USB devices are authorized by default (or temporary) to connect to the system"
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Display --indent 2 --text "- Checking USB devices authorization" --result "${STATUS_ENABLED}" --color YELLOW
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# To-Be-Added: create documentation and enable the suggestion
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2018-01-26 12:36:33 +01:00
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#if [ ${USBGUARD_FOUND} -eq 0 ]; then
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2018-01-26 12:24:33 +01:00
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# ReportSuggestion ${TEST_NO} "Disable USB devices authorization, to prevent unauthorized storage or data theft"
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#fi
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AddHP 0 3
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else
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LogText "Result: None USB devices are authorized by default (or temporary) to connect to the system"
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Display --indent 2 --text "- Checking USB devices authorization" --result "${STATUS_DISABLED}" --color GREEN
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AddHP 3 3
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fi
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fi
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#
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#################################################################################
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#
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2018-01-26 12:28:52 +01:00
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# Test : USB-3000
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2018-01-26 12:24:33 +01:00
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# Description : Perform USBGuard check
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2018-01-26 12:28:52 +01:00
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Register --test-no USB-3000 --os Linux --weight L --network NO --category security --description "Check for presence of USBGuard"
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2018-01-26 12:24:33 +01:00
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if [ ${SKIPTEST} -eq 0 ]; then
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2018-01-26 12:28:52 +01:00
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if [ ${USBGUARD_FOUND} -eq 1 ]; then
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2018-01-24 19:29:50 +01:00
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LogText "Result: USBGuard is installed (${USBGUARDBINARY})"
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Display --indent 2 --text "- Checking USBGuard" --result "${STATUS_FOUND}" --color GREEN
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AddHP 1 1
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LogText "Checking USBGuard configuration file"
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if [ -f /etc/usbguard/usbguard-daemon.conf ]; then
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USBGUARD_CONFIG="/etc/usbguard/usbguard-daemon.conf"
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else
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USBGUARD_CONFIG=""
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fi
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if [ ! -z "${USBGUARD_CONFIG}" ]; then
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LogText "Result: USBGuard configuration found (${USBGUARD_CONFIG})"
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Display --indent 4 --text "- Configuration" --result "${STATUS_FOUND}" --color GREEN
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AddHP 1 1
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LogText "Checking USBGuard restore controller device state (RestoreControllerDeviceState)"
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USBGUARD_RESTORE_POLICY=$(${AWKBINARY} -F '=' -v OPT="RestoreControllerDeviceState" 'index($0, OPT) == 1 {print $2}' ${USBGUARD_CONFIG})
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if [ ! -z "${USBGUARD_RESTORE_POLICY}" ]; then
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LogText "Result: RestoreControllerDeviceState = ${USBGUARD_RESTORE_POLICY}"
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case "${USBGUARD_RESTORE_POLICY}" in
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"true")
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Display --indent 6 --text "- Restore controller device state" --result "${USBGUARD_RESTORE_POLICY}" --color YELLOW
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LogText " Consider changing RestoreControllerDeviceState to \"false\""
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# To-Be-Added: assign TEST_NO, create documentation, and enable the suggestion
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# ReportSuggestion ${TEST_NO} "Consider hardening USBGuard configuration" "RestoreControllerDeviceState (${USBGUARD_RESTORE_POLICY} --> false)"
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AddHP 0 1
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;;
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"false")
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Display --indent 6 --text "- Restore controller device state" --result "${USBGUARD_RESTORE_POLICY}" --color GREEN
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AddHP 1 1
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;;
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*)
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LogText "Result: Invalid configuration for RestoreControllerDeviceState"
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Display --indent 6 --text "- Restore controller device state" --result "Invalid" --color RED
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# To-Be-Added: assign TEST_NO, create documentation, and enable the suggestion
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# ReportSuggestion ${TEST_NO} "Fix USBGuard configuration" "RestoreControllerDeviceState invalid \"${USBGUARD_RESTORE_POLICY}\""
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AddHP 0 1
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;;
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esac
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else
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LogText "Result: RestoreControllerDeviceState not found"
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Display --indent 6 --text "- Restore controller device state" --result "NOT FOUND" --color WHITE
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AddHP 0 1
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fi
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LogText "Checking USBGuard rule for controllers connected before daemon starts (PresentControllerPolicy)"
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USBGUARD_CONTROLLER_POLICY=$(${AWKBINARY} -F '=' -v OPT="PresentControllerPolicy" 'index($0, OPT) == 1 {print $2}' ${USBGUARD_CONFIG})
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if [ ! -z "${USBGUARD_CONTROLLER_POLICY}" ]; then
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LogText "Result: PresentControllerPolicy = ${USBGUARD_CONTROLLER_POLICY}"
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case "${USBGUARD_CONTROLLER_POLICY}" in
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"allow"|"keep")
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Display --indent 6 --text "- Rule for controllers connected before daemon starts" --result "${USBGUARD_CONTROLLER_POLICY}" --color YELLOW
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LogText " Consider changing PresentControllerPolicy to \"apply-policy\", \"block\" or \"reject\""
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# To-Be-Added: assign TEST_NO, create documentation, and enable the suggestion
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# ReportSuggestion ${TEST_NO} "Consider hardening USBGuard configuration" "PresentControllerPolicy (${USBGUARD_CONTROLLER_POLICY} --> (apply-policy|block|reject)"
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AddHP 0 1
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;;
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"apply-policy"|"block"|"reject")
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Display --indent 6 --text "- Rule for controllers connected before daemon starts" --result "${USBGUARD_CONTROLLER_POLICY}" --color GREEN
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AddHP 1 1
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;;
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*)
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LogText "Result: Invalid configuration for PresentControllerPolicy"
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Display --indent 6 --text "- Rule for controllers connected before daemon starts" --result "Invalid" --color RED
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# To-Be-Added: assign TEST_NO, create documentation, and enable the suggestion
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# ReportSuggestion ${TEST_NO} "Fix USBGuard configuration" "PresentControllerPolicy invalid \"${USBGUARD_CONTROLLER_POLICY}\""
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AddHP 0 1
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;;
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esac
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else
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LogText "Result: PresentControllerPolicy not found"
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Display --indent 6 --text "- Rule for controllers connected before daemon starts" --result "NOT FOUND" --color WHITE
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AddHP 0 1
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fi
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LogText "Checking USBGuard rule for devices connected before daemon starts (PresentDevicePolicy)"
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USBGUARD_DEVICE_POLICY=$(${AWKBINARY} -F '=' -v OPT="PresentDevicePolicy" 'index($0, OPT) == 1 {print $2}' ${USBGUARD_CONFIG})
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if [ ! -z "${USBGUARD_DEVICE_POLICY}" ]; then
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LogText "Result: PresentDevicePolicy = ${USBGUARD_DEVICE_POLICY}"
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case "${USBGUARD_DEVICE_POLICY}" in
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"allow"|"keep")
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Display --indent 6 --text "- Rule for devices connected before daemon starts" --result "${USBGUARD_DEVICE_POLICY}" --color YELLOW
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LogText " Consider changing PresentDevicePolicy to \"apply-policy\", \"block\" or \"reject\""
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# To-Be-Added: assign TEST_NO, create documentation, and enable the suggestion
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# ReportSuggestion ${TEST_NO} "Consider hardening USBGuard configuration" "PresentDevicePolicy (${USBGUARD_DEVICE_POLICY} --> (apply-policy|block|reject)"
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AddHP 0 1
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;;
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"apply-policy"|"block"|"reject")
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Display --indent 6 --text "- Rule for devices connected before daemon starts" --result "${USBGUARD_DEVICE_POLICY}" --color GREEN
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AddHP 1 1
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;;
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*)
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LogText "Result: Invalid configuration for PresentDevicePolicy"
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Display --indent 6 --text "- Rule for devices connected before daemon starts" --result "Invalid" --color RED
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# To-Be-Added: assign TEST_NO, create documentation, and enable the suggestion
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# ReportSuggestion ${TEST_NO} "Fix USBGuard configuration" "PresentDevicePolicy invalid \"${USBGUARD_DEVICE_POLICY}\""
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AddHP 0 1
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;;
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esac
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else
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LogText "Result: PresentDevicePolicy not found"
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Display --indent 6 --text "- Rule for devices connected before daemon starts" --result "NOT FOUND" --color WHITE
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AddHP 0 1
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fi
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LogText "Checking USBGuard rule for devices inserted after daemon starts (InsertedDevicePolicy)"
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USBGUARD_INSERTED_POLICY=$(${AWKBINARY} -F '=' -v OPT="InsertedDevicePolicy" 'index($0, OPT) == 1 {print $2}' ${USBGUARD_CONFIG})
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if [ ! -z "${USBGUARD_INSERTED_POLICY}" ]; then
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LogText "Result: InsertedDevicePolicy = ${USBGUARD_INSERTED_POLICY}"
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case "${USBGUARD_INSERTED_POLICY}" in
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"allow"|"keep")
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Display --indent 6 --text "- Rule for devices inserted after daemon starts" --result "${USBGUARD_INSERTED_POLICY}" --color YELLOW
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LogText " Consider changing InsertedDevicePolicy to \"apply-policy\", \"block\" or \"reject\""
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# To-Be-Added: assign TEST_NO, create documentation, and enable the suggestion
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# ReportSuggestion ${TEST_NO} "Consider hardening USBGuard configuration" "InsertedDevicePolicy (${USBGUARD_INSERTED_POLICY} --> (apply-policy|block|reject)"
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AddHP 0 1
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;;
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"apply-policy"|"block"|"reject")
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Display --indent 6 --text "- Rule for devices inserted after daemon starts" --result "${USBGUARD_INSERTED_POLICY}" --color GREEN
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AddHP 1 1
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;;
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*)
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LogText "Result: Invalid configuration for InsertedDevicePolicy"
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Display --indent 6 --text "- Rule for devices inserted after daemon starts" --result "Invalid" --color RED
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# To-Be-Added: assign TEST_NO, create documentation, and enable the suggestion
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# ReportSuggestion ${TEST_NO} "Fix USBGuard configuration" "InsertedDevicePolicy invalid \"${USBGUARD_INSERTED_POLICY}\""
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AddHP 0 1
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;;
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esac
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else
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LogText "Result: InsertedDevicePolicy not found"
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Display --indent 6 --text "- Rule for devices inserted after daemon starts" --result "NOT FOUND" --color WHITE
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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
|
2018-01-26 12:24:33 +01:00
|
|
|
#ReportSuggestion ${TEST_NO} "Install USBGuard RuleFile" "\"man usbguard\" for instructions to install initial policies"
|
2018-01-24 19:29:50 +01:00
|
|
|
AddHP 0 1
|
|
|
|
|
fi
|
|
|
|
|
|
|
|
|
|
else
|
|
|
|
|
Display --indent 4 --text "- Configuration" --result "${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
|
|
|
|
|
|
|
|
|
|
#
|
|
|
|
|
#================================================================================
|
2018-01-26 12:28:52 +01:00
|
|
|
# Lynis - Security Auditing and System Hardening for Linux and UNIX - https://cisofy.com
|
