#!/bin/sh

#################################################################################
#
#   Lynis
# ------------------
#
# Copyright 2007-2013, Michael Boelen
# Copyright 2007-2021, CISOfy
#
# 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.
#
#################################################################################
#
    AIDECONFIG=""
    CSF_CONFIG="${ROOTDIR}etc/csf/csf.conf"
    FILE_INT_TOOL=""
    FILE_INT_TOOL_FOUND=0     # Boolean, file integrity tool found
#
#################################################################################
#
    InsertSection "${SECTION_FILE_INTEGRITY}"
    Display --indent 2 --text "- Checking file integrity tools"
#
#################################################################################
#
    # Test        : FINT-4310
    # Description : Check if AFICK is installed
    Register --test-no FINT-4310 --weight L --network NO --category security --description "AFICK availability"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Checking AFICK binary"
        if [ -n "${AFICKBINARY}" ]; then
            LogText "Result: AFICK is installed (${AFICKBINARY})"
            Report "file_integrity_tool[]=afick"
            FILE_INT_TOOL="afick"
            FILE_INT_TOOL_FOUND=1
            Display --indent 4 --text "- AFICK" --result "${STATUS_FOUND}" --color GREEN
        else
            LogText "Result: AFICK is not installed"
            if IsVerbose; then Display --indent 4 --text "- AFICK" --result "${STATUS_NOT_FOUND}" --color WHITE; fi
        fi
    fi
#
#################################################################################
#
    # Test        : FINT-4314
    # Description : Check if AIDE is installed
    Register --test-no FINT-4314 --weight L --network NO --category security --description "AIDE availability"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Checking AIDE binary"
        if [ -n "${AIDEBINARY}" ]; then
            LogText "Result: AIDE is installed (${AIDEBINARY})"
            Report "file_integrity_tool[]=aide"
            FILE_INT_TOOL="aide"
            FILE_INT_TOOL_FOUND=1
            Display --indent 4 --text "- AIDE" --result "${STATUS_FOUND}" --color GREEN
        else
            LogText "Result: AIDE is not installed"
            if IsVerbose; then Display --indent 4 --text "- AIDE" --result "${STATUS_NOT_FOUND}" --color WHITE; fi
        fi
    fi
#
#################################################################################
#
    # Test        : FINT-4315
    # Description : Check AIDE configuration file
    if [ -n "${AIDEBINARY}" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no FINT-4315 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check AIDE configuration file"
    if [ ${SKIPTEST} -eq 0 ]; then
        AIDE_CONFIG_LOCS="${ROOTDIR}etc ${ROOTDIR}etc/aide ${ROOTDIR}usr/local/etc"
        LogText "Test: search for aide.conf in ${AIDE_CONFIG_LOCS}"
        for I in ${AIDE_CONFIG_LOCS}; do
            if [ -f "${I}/aide.conf" ]; then
                LogText "Result: found aide.conf in directory ${I}"
                AIDECONFIG="${I}/aide.conf"
            fi
        done

        if [ -z "${AIDECONFIG}" ]; then
            Display --indent 6 --text "- AIDE config file" --result "${STATUS_NOT_FOUND}" --color RED
            ReportWarning "${TEST_NO}" "No AIDE configuration file was found, needed for AIDE functionality"
        else
            LogText "Checking configuration file ${AIDECONFIG} for errors"
            FIND=$(${AIDEBINARY} --config=${AIDECONFIG} -D)
            if [ $? -eq 0 ]; then
                Display --indent 6 --text "- AIDE config file" --result "${STATUS_FOUND}" --color GREEN
            else
                Display --indent 6 --text "- AIDE config file" --result "${STATUS_WARNING}" --color YELLOW
                ReportSuggestion "${TEST_NO}" "Check the AIDE configuration file as it may contain errors"
            fi
        fi
    fi
#
#################################################################################
#
    # Test        : FINT-4316
    # Description : Presence of AIDE database and size check
    if [ -n "${AIDEBINARY}" -a -n "${AIDECONFIG}" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no FINT-4316 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Presence of AIDE database and size check"
    if [ ${SKIPTEST} -eq 0 ]; then
        AIDE_DB=$(${EGREPBINARY} '(^database|^database_in)=' ${AIDECONFIG} | ${SEDBINARY} "s/.*://")
        if case ${AIDE_DB} in @@*) ;; *) false;; esac; then
            I=$(${GREPBINARY} "@@define.*DBDIR" ${AIDECONFIG} | ${AWKBINARY} '{print $3}')
            AIDE_DB=$(echo ${AIDE_DB} | ${SEDBINARY} "s#.*}#${I}#")
        fi
        LogText "Test: search for AIDE database on disk ${AIDE_DB}"

        if [ ! -e "${AIDE_DB}" ]; then
            Display --indent 6 --text "- AIDE database" --result "${STATUS_NOT_FOUND}" --color RED
            LogText "Result: AIDE database ${AIDE_DB} does not exist"
            ReportWarning "${TEST_NO}" "No AIDE database was found, needed for AIDE functionality"
        else
            LogText "Checking database size ${AIDE_DB}"
            if [ -s "${AIDE_DB}" ]; then
                Display --indent 6 --text "- AIDE database" --result "${STATUS_FOUND}" --color GREEN
                LogText "Result: AIDE database ${AIDE_DB} exist and has a size greater than zero"
            else
                Display --indent 6 --text "- AIDE database" --result "${STATUS_WARNING}" --color YELLOW
                LogText "Result: AIDE database ${AIDE_DB} exist but has a size of zero"
                ReportSuggestion "${TEST_NO}" "Check the AIDE database as it may contain errors"
            fi
        fi
        unset AIDE_DB I
    fi
#
#################################################################################
#
    # Test        : FINT-4318
    # Description : Check if Osiris is installed
    Register --test-no FINT-4318 --weight L --network NO --category security --description "Osiris availability"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Checking Osiris binary"
        if [ -n "${OSIRISBINARY}" ]; then
            LogText "Result: Osiris is installed (${OSIRISBINARY})"
            Report "file_integrity_tool[]=osiris"
            FILE_INT_TOOL="osiris"
            FILE_INT_TOOL_FOUND=1
            Display --indent 4 --text "- Osiris" --result "${STATUS_FOUND}" --color GREEN
        else
            LogText "Result: Osiris is not installed"
            if IsVerbose; then Display --indent 4 --text "- Osiris" --result "${STATUS_NOT_FOUND}" --color WHITE; fi
        fi
    fi
#
#################################################################################
#
    # Test        : FINT-4322
    # Description : Check if Samhain is installed
    Register --test-no FINT-4322 --weight L --network NO --category security --description "Samhain availability"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Checking Samhain binary"
        if [ -n "${SAMHAINBINARY}" ]; then
            LogText "Result: Samhain is installed (${SAMHAINBINARY})"
            Report "file_integrity_tool[]=samhain"
            FILE_INT_TOOL="samhain"
            FILE_INT_TOOL_FOUND=1
            Display --indent 4 --text "- Samhain" --result "${STATUS_FOUND}" --color GREEN
        else
            LogText "Result: Samhain is not installed"
            if IsVerbose; then Display --indent 4 --text "- Samhain" --result "${STATUS_NOT_FOUND}" --color WHITE; fi
        fi
    fi
#
#################################################################################
#
    # Test        : FINT-4326
    # Description : Check if Tripwire is installed
    Register --test-no FINT-4326 --weight L --network NO --category security --description "Tripwire availability"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Checking Tripwire binary"
        if [ -n "${TRIPWIREBINARY}" ]; then
            LogText "Result: Tripwire is installed (${TRIPWIREBINARY})"
            Report "file_integrity_tool[]=tripwire"
            FILE_INT_TOOL="tripwire"
            FILE_INT_TOOL_FOUND=1
            Display --indent 4 --text "- Tripwire" --result "${STATUS_FOUND}" --color GREEN
        else
            LogText "Result: Tripwire is not installed"
            if IsVerbose; then Display --indent 4 --text "- Tripwire" --result "${STATUS_NOT_FOUND}" --color WHITE; fi
        fi
    fi
#
#################################################################################
#
    # Test        : FINT-4328
    # Description : Check if OSSEC system integrity tool is running
    Register --test-no FINT-4328 --weight L --network NO --category security --description "OSSEC syscheck daemon running"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Checking if OSSEC syscheck daemon is running"
        if IsRunning "ossec-syscheckd"; then
            LogText "Result: syscheck (OSSEC) active"
            Report "file_integrity_tool[]=ossec"
            FILE_INT_TOOL="ossec-syscheck"
            FILE_INT_TOOL_FOUND=1
            Display --indent 4 --text "- OSSEC (syscheck)" --result "${STATUS_FOUND}" --color GREEN
        else
            LogText "Result: syscheck (OSSEC) is not active"
            if IsVerbose; then Display --indent 4 --text "- OSSEC" --result "${STATUS_NOT_FOUND}" --color WHITE; fi
        fi
    fi
#
#################################################################################
#
    # Test        : FINT-4330
    # Description : Check if mtree is installed
    # Note        : Usually on BSD and similar
    Register --test-no FINT-4330 --weight L --network NO --category security --description "mtree availability"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Checking mtree binary"
        if [ -n "${MTREEBINARY}" ]; then
            LogText "Result: mtree is installed (${MTREEBINARY})"
            Report "file_integrity_tool[]=mtree"
            FILE_INT_TOOL="mtree"
            FILE_INT_TOOL_FOUND=1
            Display --indent 4 --text "- mtree" --result "${STATUS_FOUND}" --color GREEN
        else
            LogText "Result: mtree is not installed"
            if IsVerbose; then Display --indent 4 --text "- mtree" --result "${STATUS_NOT_FOUND}" --color WHITE; fi
        fi
    fi
#
#################################################################################
#
    # Test        : FINT-4334
    # Description : Check if LFD is used (part of CSF suite)
    if [ -f ${CSF_CONFIG} ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no FINT-4334 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check lfd daemon status"
    if [ ${SKIPTEST} -eq 0 ]; then
        Display --indent 4 --text "- lfd (CSF)" --result "${STATUS_FOUND}" --color GREEN
        LogText "Test: determine lfd status"
        if IsRunning "lfd - sleeping"; then
            LogText "Result: lfd daemon is running (CSF)"
            Report "file_integrity_tool[]=csf-lfd"
            Display --indent 6 --text "- LFD (CSF) daemon" --result "${STATUS_RUNNING}" --color GREEN
            FILE_INT_TOOL="csf-lfd"
            FILE_INT_TOOL_FOUND=1
        else
            Display --indent 6 --text "- LFD (CSF) daemon" --result "${STATUS_NOT_RUNNING}" --color YELLOW
        fi
    fi
#
#################################################################################
#
    # Test        : FINT-4336
    # Description : Check if LFD is enabled (part of CSF suite)
    if [ -f ${CSF_CONFIG} ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no FINT-4336 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check lfd configuration status"
    if [ ${SKIPTEST} -eq 0 ]; then
        # LFD configuration parameters
        ENABLED=$(${GREPBINARY} "^LF_DAEMON = \"1\"" ${CSF_CONFIG})
        if [ -n "${ENABLED}" ]; then
            LogText "Result: lfd service is configured to run"
            Display --indent 6 --text "- Configuration status" --result "${STATUS_ENABLED}" --color GREEN
        else
            LogText "Result: lfd service is configured NOT to run"
            Display --indent 6 --text "- Configuration status" --result "${STATUS_DISABLED}" --color YELLOW
        fi
        ENABLED=$(${GREPBINARY} "^LF_DIRWATCH =" ${CSF_CONFIG} | ${AWKBINARY} '{ print $3 }' | ${SEDBINARY} 's/\"//g')
        if [ ! "${ENABLED}" = "0" -a -n "${ENABLED}" ]; then
            LogText "Result: lfd directory watching is enabled (value: ${ENABLED})"
            Display --indent 6 --text "- Temporary directory watches" --result "${STATUS_ENABLED}" --color GREEN
        else
            LogText "Result: lfd directory watching is disabled"
            Display --indent 6 --text "- Temporary directory watches" --result "${STATUS_DISABLED}" --color YELLOW
        fi
        ENABLED=$(${GREPBINARY} "^LF_DIRWATCH_FILE =" ${CSF_CONFIG} | ${AWKBINARY} '{ print $3 }' | ${SEDBINARY} 's/\"//g')
        if [ ! "${ENABLED}" = "0" -a -n "${ENABLED}" ]; then
            Display --indent 6 --text "- Directory/File watches" --result "${STATUS_ENABLED}" --color GREEN
        else
            Display --indent 6 --text "- Directory/File watches" --result "${STATUS_DISABLED}" --color YELLOW
        fi
    fi
#
#################################################################################
#
    # Test        : FINT-4338
    # Description : Check if osquery system integrity tool is running
    Register --test-no FINT-4338 --weight L --network NO --category security --description "osqueryd syscheck daemon running"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Checking if osqueryd syscheck daemon is running"
        if IsRunning "osqueryd"; then
            LogText "Result: syscheck (osquery) installed"
            Report "file_integrity_tool[]=osquery"
            FILE_INT_TOOL="osquery"
            FILE_INT_TOOL_FOUND=1
            Display --indent 4 --text "- osquery daemon (syscheck)" --result "${STATUS_FOUND}" --color GREEN
        else
            LogText "Result: syscheck (osquery) not installed"
            if IsVerbose; then Display --indent 4 --text "- osquery daemon (syscheck)" --result "${STATUS_NOT_FOUND}" --color WHITE; fi
        fi
    fi
#
#################################################################################
#
    # Test        : FINT-4339
    # Description : Check IMA/EVM status
    if [ ! -z "${EVMCTLBINARY}" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; SKIPREASON="No evmctl binary found"; fi
    Register --test-no FINT-4339 --os Linux --preqs-met ${PREQS_MET} --skip-reason "${SKIPREASON}" --weight L --network NO --category security --description "Check IMA/EVM status"
    if [ ${SKIPTEST} -eq 0 ]; then
        FOUND=0
        if [ -e /sys/kernel/security/ima ]; then
            FOUND=$(${CAT_BINARY} /sys/kernel/security/ima/runtime_measurements_count)
        fi
        if [ "${FOUND}" -ne 1 ]; then
            LogText "Result: EVM tools found but IMA/EVM disabled"
            Display --indent 2 --text "- IMA/EVM (status)" --result "${STATUS_DISABLED}" --color YELLOW
        else
            LogText "Result: EVM tools found, IMA/EVM enabled"
            FILE_INT_TOOL="evmctl"
            FILE_INT_TOOL_FOUND=1
            Display --indent 2 --text "- IMA/EVM (status)" --result "${STATUS_ENABLED}" --color GREEN
        fi
    fi
#
#################################################################################
#
    # Test        : FINT-4340
    # Description : Check dm-integrity status
    if [ ! -z "${INTEGRITYSETUPBINARY}" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; SKIPREASON="No integritysetup binary found"; fi
    Register --test-no FINT-4340 --os Linux --preqs-met ${PREQS_MET} --skip-reason "${SKIPREASON}" --weight L --network NO --category security --description "Check dm-integrity status"
    if [ ${SKIPTEST} -eq 0 ]; then
        FOUND=0
        ROOTPROTECTED=0
	ROOTDEVICE=$(${MOUNTBINARY} | ${AWKBINARY} '/ on \/ type / { print $1 }')
	for DEVICE in /dev/mapper/*; do
	    if [ -e "${DEVICE}" ]; then
		FIND=$(${INTEGRITYSETUPBINARY} status "${DEVICE}" | ${EGREPBINARY} 'type:.*INTEGRITY')
		if [ ! -z "${FIND}" ]; then
		    FOUND=1
		    LogText "Result: found dm-integrity device ${DEVICE}"
		    if [ "${DEVICE}" = "${ROOTDEVICE}" ]; then
			ROOTPROTECTED=1
		    fi
		fi
	    fi
	done
        if [ "${FOUND}" -ne 1 ]; then
            LogText "Result: dm-integrity tools found but no active devices"
            Display --indent 2 --text "- dm-integrity (status)" --result "${STATUS_DISABLED}" --color WHITE
        else
            LogText "Result: dm-integrity tools found, active devices"
	    if [ ${ROOTPROTECTED} -eq 1 ]; then
		LogText "Result: root filesystem is protected by dm-integrity"
		Display --indent 2 --text "- dm-integrity (status)" --result "${STATUS_ENABLED}" --color GREEN
	    else
		LogText "Result: root filesystem is not protected by dm-integrity but active devices found"
		Display --indent 2 --text "- dm-integrity (status)" --result "${STATUS_FOUND}" --color YELLOW
	    fi
            FILE_INT_TOOL="dm-integrity"
            FILE_INT_TOOL_FOUND=1
            Display --indent 2 --text "- dm-integrity (status)" --result "${STATUS_ENABLED}" --color GREEN
        fi
    fi
#
#################################################################################
#
    # Test        : FINT-4341
    # Description : Check dm-verity status
    if [ ! -z "${VERITYSETUPBINARY}" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; SKIPREASON="No veritysetup binary found"; fi
    Register --test-no FINT-4341 --os Linux --preqs-met ${PREQS_MET} --skip-reason "${SKIPREASON}" --weight L --network NO --category security --description "Check dm-verity status"
    if [ ${SKIPTEST} -eq 0 ]; then
        FOUND=0
        ROOTPROTECTED=0
	ROOTDEVICE=$(${MOUNTBINARY} | ${AWKBINARY} '/ on \/ type / { print $1 }')
	for DEVICE in /dev/mapper/*; do
	    if [ -e "${DEVICE}" ]; then
		FIND=$(${VERITYSETUPBINARY} status "${DEVICE}" | ${EGREPBINARY} 'type:.*VERITY')
		if [ ! -z "${FIND}" ]; then
		    FOUND=1
		    LogText "Result: found dm-verity device ${DEVICE}"
		    if [ "${DEVICE}" = "${ROOTDEVICE}" ]; then
			ROOTPROTECTED=1
		    fi
		fi
	    fi
	done
        if [ "${FOUND}" -ne 1 ]; then
            LogText "Result: dm-verity tools found but no active devices"
            Display --indent 2 --text "- dm-verity (status)" --result "${STATUS_DISABLED}" --color WHITE
        else
            LogText "Result: dm-verity tools found, active devices"
	    if [ ${ROOTPROTECTED} -eq 1 ]; then
		LogText "Result: root filesystem is protected by dm-verity"
		Display --indent 2 --text "- dm-verity (status)" --result "${STATUS_ENABLED}" --color GREEN
	    else
		LogText "Result: root filesystem is not protected by dm-verity but active devices found"
		Display --indent 2 --text "- dm-verity (status)" --result "${STATUS_FOUND}" --color YELLOW
	    fi
            FILE_INT_TOOL="dm-verity"
            FILE_INT_TOOL_FOUND=1
        fi
    fi
#
#################################################################################
#
    # Test        : FINT-4402 (was FINT-4316)
    # Description : Check if AIDE is configured to use SHA256 or SHA512 checksums
    if [ ! "${AIDEBINARY}" = "" -a -n "${AIDECONFIG}" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no FINT-4402 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "AIDE configuration: Checksums (SHA256 or SHA512)"
    if [ ${SKIPTEST} -eq 0 ]; then
        FIND=$(${GREPBINARY} -v "^#" ${AIDECONFIG} | ${EGREPBINARY} "= .*(sha256|sha512)")
        if [ -z "${FIND}" ]; then
            LogText "Result: No SHA256 or SHA512 found for creating checksums"
            Display --indent 6 --text "- AIDE config (Checksum)" --result Suggestion --color YELLOW
            ReportSuggestion "${TEST_NO}" "Use SHA256 or SHA512 to create checksums in AIDE"
            AddHP 1 3
        else
            LogText "Result: Found SHA256 or SHA512 found for creating checksums"
            Display --indent 6 --text "- AIDE config (Checksum)" --result "${STATUS_OK}" --color GREEN
            AddHP 2 2
        fi
    fi
#
#################################################################################
#
    # Test        : FINT-4350
    # Description : Check if at least one file integrity tool is installed
    Register --test-no FINT-4350 --weight L --network NO --category security --description "File integrity software installed"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Check if at least on file integrity tool is available/installed"
        if [ ${FILE_INT_TOOL_FOUND} -eq 1 ]; then
            LogText "Result: found at least one file integrity tool"
            Display --indent 2 --text "- Checking presence integrity tool" --result "${STATUS_FOUND}" --color GREEN
            AddHP 5 5
        else
            LogText "Result: No file integrity tools found"
            Display --indent 2 --text "- Checking presence integrity tool" --result "${STATUS_NOT_FOUND}" --color YELLOW
            ReportSuggestion "${TEST_NO}" "Install a file integrity tool to monitor changes to critical and sensitive files"
            AddHP 0 5
        fi
    fi
#
#################################################################################
#
    WaitForKeyPress
#
#================================================================================
# Lynis - Copyright 2007-2021 Michael Boelen, CISOfy - https://cisofy.com