lynis/include/tests_filesystems

#!/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.
#
#################################################################################
#
# File systems
#
#################################################################################
#
    # Number of days to mark a file as old
    TMP_OLD_DAYS=90
    LVM_VG_USED=0
#
#################################################################################
#
    InsertSection "${SECTION_FILE_SYSTEMS}"
#
#################################################################################
#
    # Test        : FILE-6310
    # Description : Checking if some mount points are separated from /
    # Goal        : Users should not be able to fill their home directory or temporary directory and creating a Denial of Service
    Register --test-no FILE-6310 --weight L --network NO --category security --description "Checking /tmp, /home and /var directory"
    if [ ${SKIPTEST} -eq 0 ]; then
        Display --indent 2 --text "- Checking mount points"
        SEPARATED_FILESYTEMS="/home /tmp /var"
        for I in ${SEPARATED_FILESYTEMS}; do
            LogText "Test: Checking if ${I} is mounted separately or mounted on / file system"
            if [ -L ${I} ]; then
                ShowSymlinkPath ${I}
                LogText "Result: ${I} is a symlink. Manual check required to determine exact file system options"
                ReportSuggestion "${TEST_NO}" "Symlinked mount point needs to be checked manually" "${I}" ""
                Display --indent 4 --text "- Checking ${I} mount point" --result SYMLINK --color WHITE
            elif [ -d ${I} ]; then
                LogText "Result: directory ${I} exists"
                case "${OS}" in
                    "AIX") FIND=$(${MOUNTBINARY} | ${AWKBINARY} -v MP=${I} '{ if ($2==MP) { print $2 }}') ;;
                    "HP-UX") FIND=$(${MOUNTBINARY} | ${AWKBINARY} -v MP=${I} '{ if ($1==MP) { print $1 }}') ;;
                    *) FIND=$(${MOUNTBINARY} | ${AWKBINARY} -v MP=${I} '{ if ($3==MP) { print $3 }}') ;;
                esac

                if IsEmpty "${FIND}"; then
                    LogText "Result: ${I} not found in mount list. Directory most likely stored on / file system"
                    Display --indent 4 --text "- Checking ${I} mount point" --result "${STATUS_SUGGESTION}" --color YELLOW
                    ReportSuggestion "${TEST_NO}" "To decrease the impact of a full ${I} file system, place ${I} on a separate partition"
                    AddHP 9 10
                else
                    LogText "Result: found ${I} as a separated mount point"
                    Display --indent 4 --text "- Checking ${I} mount point" --result "${STATUS_OK}" --color GREEN
                    AddHP 10 10
                fi
            else
                LogText "Result: directory ${I} does not exist"
            fi
        done
    fi
#
#################################################################################
#
    # Test        : FILE-6311
    # Description : Checking LVM Volume Groups
    # Notes       : No volume groups found is sent to STDERR for unclear reasons. Filtering both STDERR redirecting and grep.
    if [ ! "${VGDISPLAYBINARY}" = "" -o ! "${LSVGBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no FILE-6311 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Checking LVM volume groups"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Checking for LVM volume groups"
        case ${OS} in
            AIX)
                 FIND=$(${LSVGBINARY} -o)
            ;;
            Linux)
                 FIND=$(${VGDISPLAYBINARY} 2> /dev/null | ${GREPBINARY} -v "No volume groups found" | ${GREPBINARY} "VG Name" | ${AWKBINARY} '{ print $3 }' | ${SORTBINARY})
            ;;
            *)
                 ReportException "${TEST_NO}:1" "Don't know this specific operating system yet, while volume group manager was found"
            ;;
        esac
        if [ -n "${FIND}" ]; then
            LogText "Result: found one or more volume groups"
            for I in ${FIND}; do
                LogText "Found LVM volume group: ${I}"
                Report "lvm_volume_group[]=${I}"
            done
            LVM_VG_USED=1
            Display --indent 2 --text "- Checking LVM volume groups" --result "${STATUS_FOUND}" --color GREEN
        else
            LogText "Result: no LVM volume groups found"
            if IsVerbose; then Display --indent 2 --text "- Checking LVM volume groups" --result "${STATUS_NONE}" --color WHITE; fi
        fi
    fi
#
#################################################################################
#
    # Test        : FILE-6312
    # Description : Checking LVM volumes
    if [ ${LVM_VG_USED} -eq 1 ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no FILE-6312 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Checking LVM volumes"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Checking for LVM volumes"
        case ${OS} in
            AIX)
                 ACTIVE_VG_LIST=$(${LSVGBINARY} -o)
                 FIND=$(for I in ${ACTIVE_VG_LIST}; do ${LSVGBINARY} -l ${I} | ${AWKBINARY} 'NR>2 { print $1 }'; done)
            ;;
            Linux)
                 FIND=$(${LVDISPLAYBINARY} | ${GREPBINARY} -v "No volume groups found" | ${GREPBINARY} "LV Name" | ${AWKBINARY} '{ print $3 }' | ${SORTBINARY})
            ;;
            *)
                 ReportException "${TEST_NO}:1" "Need specific test for gathering volume manager data"
            ;;
        esac
        if [ ! "${FIND}" = "" ]; then
            LogText "Result: found one or more volumes"
            for I in ${FIND}; do
                LogText "Found LVM volume: ${I}"
                Report "lvm_volume[]=${I}"
            done
            Display --indent 4 --text "- Checking LVM volumes" --result "${STATUS_FOUND}" --color GREEN
        else
            LogText "Result: no LVM volume groups found"
            Display --indent 4 --text "- Checking LVM volumes" --result "${STATUS_NONE}" --color WHITE
        fi
    fi
#
#################################################################################
#
    # Test        : FILE-6316
    # Description : Checking /etc/fstab file permissions
    #Register --test-no FILE-6316 --os Linux --weight L --network NO --category security --description "Checking /etc/fstab"
    #if [ ${SKIPTEST} -eq 0 ]; then
    # 644
#
#################################################################################
#
    # Test        : FILE-6323
    # Description : Checking Linux EXT2, EXT3, EXT4 file systems
    Register --test-no FILE-6323 --os Linux --weight L --network NO --category security --description "Checking EXT file systems"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Checking for Linux EXT file systems"
        FIND=$(${MOUNTBINARY} -t ext2,ext3,ext4 | ${AWKBINARY} '{ print $3","$5 }')
        if [ -n "${FIND}" ]; then
            LogText "Result: found one or more EXT file systems"
            for I in ${FIND}; do
                FILESYSTEM=$(echo ${I} | ${CUTBINARY} -d ',' -f1)
                FILETYPE=$(echo ${I} | ${CUTBINARY} -d ',' -f2)
                LogText "File system: ${FILESYSTEM} (type: ${FILETYPE})"
                Report "file_systems_ext[]=${FILESYSTEM}|${FILETYPE}|"
            done
        else
            LogText "Result: no EXT file systems found"
        fi
    fi
#
#################################################################################
#
    # Test        : FILE-6324
    # Description : Checking Linux XFS file systems
    Register --test-no FILE-6324 --os Linux --weight L --network NO --category security --description "Checking XFS file systems"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Checking for Linux XFS file systems"
        FIND=$(${MOUNTBINARY} -t xfs | ${AWKBINARY} '{ print $3","$5 }')
        if [ -n "${FIND}" ]; then
            LogText "Result: found one or more XFS file systems"
            for I in ${FIND}; do
                FILESYSTEM=$(echo ${I} | ${CUTBINARY} -d ',' -f1)
                FILETYPE=$(echo ${I} | ${CUTBINARY} -d ',' -f2)
                LogText "File system: ${FILESYSTEM} (type: ${FILETYPE})"
                Report "file_systems_xfs[]=${FILESYSTEM}|${FILETYPE}|"
            done
        else
            LogText "Result: no XFS file systems found"
        fi
    fi
#
#################################################################################
#
    # Test        : FILE-6329
    # Description : Query all FFS/UFS mounts from /etc/fstab
    if [ -f /etc/fstab ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no FILE-6329 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Checking FFS/UFS file systems"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Query /etc/fstab for available FFS/UFS mount points"
        FIND=$(${AWKBINARY} '{ if ($3 == "ufs" || $3 == "ffs" ) { print $1":"$2":"$3":"$4":" }}' /etc/fstab)
        if [ -z "${FIND}" ]; then
            if IsVerbose; then Display --indent 2 --text "- Querying FFS/UFS mount points (fstab)" --result "${STATUS_NONE}" --color WHITE; fi
            LogText "Result: unable to find any single mount point (FFS/UFS)"
        else
            Display --indent 2 --text "- Querying FFS/UFS mount points (fstab)" --result "${STATUS_FOUND}" --color GREEN
            Report "filesystem[]=ufs"
            for I in ${FIND}; do
                LogText "FFS/UFS mount found: ${I}"
                Report "mountpoint_ufs[]=${I}"
            done
        fi
    fi
#
#################################################################################
#
    # Test        : FILE-6330
    # Description : Query ZFS mounts
    # Note        : mount -p does not work under Linux
    Register --test-no FILE-6330 --os FreeBSD --weight L --network NO --category security --description "Checking ZFS file systems"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Discover for available ZFS mount points"
        FIND=$(${MOUNTBINARY} -p | ${AWKBINARY} '{ if ($3 == "zfs") { print $1":"$2":"$3":"$4":" }}')
        if [ -z "${FIND}" ]; then
            Display --indent 2 --text "- Querying ZFS mount points (mount -p)" --result "${STATUS_NONE}" --color WHITE
            LogText "Result: unable to find any single mount point (ZFS)"
        else
            Display --indent 2 --text "- Querying ZFS mount points (mount -p)" --result "${STATUS_FOUND}" --color GREEN
            Report "filesystem[]=zfs"
            for I in ${FIND}; do
                LogText "ZFS mount found: ${I}"
                Report "mountpoint_zfs[]=${I}"
            done
        fi
    fi
#
#################################################################################
#
    # Test        : FILE-6439
    # Description : Query all HAMMER PFS mounts from /etc/fstab
    Register --test-no FILE-6439 --os DragonFly --weight L --network NO --category security --description "Checking HAMMER PFS mounts"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Query /etc/fstab for available HAMMER PFS mount points"
        FIND=$(${MOUNTBINARY} -p | ${AWKBINARY} '{ if ($3 == "null") { print $1":"$2":"$3":"$4":" }}')
        if [ -z "${FIND}" ]; then
            Display --indent 2 --text "- Querying HAMMER PFS mount points (mount -p)" --result "${STATUS_NONE}" --color WHITE
            LogText "Result: unable to find any single PFS mount point"
        else
            Display --indent 2 --text "- Querying HAMMER PFS mount points (mount -p)" --result "${STATUS_FOUND}" --color GREEN
            Report "filesystem[]=hammer"
            for I in ${FIND}; do
                LogText "HAMMER mount found: ${I}"
                Report "mountpoint_hammer[]=${I}"
            done
        fi
    fi
#
#################################################################################
#
    # Test        : FILE-6332
    # Description : Check swap partitions
    if [ -f /etc/fstab ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no FILE-6332 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Checking swap partitions"
    if [ ${SKIPTEST} -eq 0 ]; then
        FOUND=0
        LogText "Test: query swap partitions from /etc/fstab file"
        # Check if third field contains 'swap'
        FIND=$(${AWKBINARY} '{ if ($2=="swap" || $3=="swap") { print $1 }}' /etc/fstab | ${GREPBINARY} -v "^#")
        for I in ${FIND}; do
            FOUND=1
            REAL=""
            UUID=""
            LogText "Swap partition found: ${I}"
            # TODO Add a test if partition is not a normal partition (e.g. UUID=)
            # Can be ^/dev/mapper/vg-name_lv-name
            # Can be ^/dev/partition

            # Test for UUID usage (e.g. UUID=uuid --> /dev/disk/by-uuid/<uuid>)
            HAS_UUID=$(echo ${I} | ${GREPBINARY} "^UUID=")
            if [ -n "${HAS_UUID}" ]; then
                UUID=$(echo ${HAS_UUID} | ${AWKBINARY} -F= '{ print $2 }')
                LogText "Result: Using ${UUID} as UUID"
                if [ -n "${BLKIDBINARY}" ]; then
                    FIND2=$(${BLKIDBINARY} | ${AWKBINARY} '{ if ($2=="UUID=\"${UUID}\"") print $1 }' | ${SEDBINARY} 's/:$//')
                    if [ -n "${FIND2}" ]; then
                        REAL="${FIND2}"
                    fi
                else
                    LogText "Result: blkid binary not found, trying by checking device listing"
                    sFILE=""
                    if [ -L /dev/disk/by-uuid/${UUID} ]; then
                        LogText "Result: found disk via /dev/disk/by-uuid listing"
                        ShowSymlinkPath /dev/disk/by-uuid/${UUID}
                        if [ -n "${sFILE}" ]; then
                            REAL="${sFILE}"
                            LogText "Result: disk is ${REAL}"
                        fi
                    else
                        LogText "Result: no symlink found to /dev/disk/by-uuid/${UUID}"
                    fi
                fi
            fi
            # Set real device
            if [ -z "${REAL}" ]; then
                REAL="${I}"
            fi
            Report "swap_partition[]=${I},${REAL},"
        done
        if [ ${FOUND} -eq 1 ]; then
            Display --indent 2 --text "- Query swap partitions (fstab)" --result "${STATUS_OK}" --color GREEN
        else
            Display --indent 2 --text "- Query swap partitions (fstab)" --result "${STATUS_NONE}" --color YELLOW
            LogText "Result: no swap partitions found in /etc/fstab"
        fi
    fi
#
#################################################################################
#
    # Test        : FILE-6336
    # Description : Check swap mount options
    # Examples    : [partition] swap swap defaults 0 0
    #               [partition] none swap sw 0 0
    if [ -f /etc/fstab ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no FILE-6336 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Checking swap mount options"
    if [ ${SKIPTEST} -eq 0 ]; then
        # Swap partitions should be mounted with 'sw' or 'swap'
        LogText "Test: check swap partitions with incorrect mount options"
        FIND=$(${AWKBINARY} '{ if ($3=="swap" && ($4!~/sw/ && $4!="defaults")) { print $1 }}' /etc/fstab)
        if [ -z "${FIND}" ]; then
            Display --indent 2 --text "- Testing swap partitions" --result "${STATUS_OK}" --color GREEN
            LogText "Result: all swap partitions have correct options (sw or swap)"
        else
            Display --indent 2 --text "- Testing swap partitions" --result "${STATUS_CHECK_NEEDED}" --color YELLOW
            LogText "Result: possible incorrect mount options used for mounting swap partition (${FIND})"
            #ReportWarning "${TEST_NO}" "Possible incorrect mount options used for swap partition (${FIND})"
            ReportSuggestion "${TEST_NO}" "Check your /etc/fstab file for swap partition mount options"
            LogText "Notes: usually swap partition have 'sw' or 'swap' in the options field (4th)"
        fi
    fi
#
#################################################################################
#
    # Test        : FILE-6344
    # Description : Check proc mount options (Linux >=3.3 only)
    # Examples    : proc /proc proc defaults,hidepid=2 0 0
    # Goal        : Users should not be able to see processes of other users
    if [ "${OS}" = "Linux" -a -f ${ROOTDIR}proc/version ]; then
        LINUX_KERNEL_MAJOR=$(echo $OS_KERNELVERSION | ${AWKBINARY} -F. '{print $1}')
        LINUX_KERNEL_MINOR=$(echo $OS_KERNELVERSION | ${AWKBINARY} -F. '{print $2}')
        if [ -n "${LINUX_KERNEL_MAJOR}" -a -n "${LINUX_KERNEL_MINOR}" ]; then
            if [ ${LINUX_KERNEL_MAJOR} -ge 3 -a ${LINUX_KERNEL_MINOR} -ge 3 ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
        else
            PREQS_MET="NO";
        fi
    fi
    Register --test-no FILE-6344 --os Linux --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Checking proc mount options"
    if [ ${SKIPTEST} -eq 0 ]; then
        # Proc should be mounted with 'hidepid=2' or 'hidepid=1' at least
        LogText "Test: check proc mount with incorrect mount options"
        FIND=$(${MOUNTBINARY} | ${EGREPBINARY} "${ROOTDIR}proc " | ${EGREPBINARY} -o "hidepid=[0-9]")
        if [ "${FIND}" = "hidepid=2" ]; then
            Display --indent 2 --text "- Testing /proc mount (hidepid)" --result "${STATUS_OK}" --color GREEN
            LogText "Result: proc mount mounted with hidepid=2"
            AddHP 3 3
        elif [ "${FIND}" = "hidepid=1" ]; then
            Display --indent 2 --text "- Testing /proc mount (hidepid)" --result "${STATUS_OK}" --color GREEN
            LogText "Result: proc mount mounted with hidepid=1"
            AddHP 2 3
        elif [ -z "${FIND}" ]; then
            # HIDEPID1_SUGGESTION=" (or at least hidepid=1)"
            AddHP 0 3
            Display --indent 2 --text "- Testing /proc mount (hidepid)" --result "${STATUS_SUGGESTION}" --color YELLOW
            LogText "Result: /proc filesystem is not mounted with option hidepid=1 or hidepid=2"
            # TODO ReportSuggestion "${TEST_NO}" "Consider mounting /proc via /etc/fstab with mount option hidepid=2" "/proc" "-"
        fi
    fi
#
#################################################################################
#
    # Test        : FILE-6354
    # Description : Search files within /tmp which are older than 3 months
    if [ -d ${ROOTDIR}tmp ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no FILE-6354 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Searching for old files in /tmp"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Searching for old files in ${ROOTDIR}tmp"
        # Search for files only in ${ROOTDIR}tmp, with an access time older than X days
        FIND=$(${FINDBINARY} ${ROOTDIR}tmp -xdev -type f -atime +${TMP_OLD_DAYS} 2> /dev/null | ${SEDBINARY} 's/ /!space!/g')
        if IsEmpty "${FIND}"; then
            Display --indent 2 --text "- Checking for old files in ${ROOTDIR}tmp" --result "${STATUS_OK}" --color GREEN
            LogText "Result: no files found in ${ROOTDIR}tmp which are older than 3 months"
        else
            Display --indent 2 --text "- Checking for old files in ${ROOTDIR}tmp" --result "${STATUS_FOUND}" --color RED
            COUNT=0
            for ITEM in ${FIND}; do
                FILE=$(echo ${ITEM} | ${SEDBINARY} 's/!space!/ /g')
                LogText "Old temporary file: ${FILE}"
                COUNT=$((COUNT + 1))
            done
            LogText "Result: found old files in ${ROOTDIR}tmp, which were not modified in the last ${TMP_OLD_DAYS} days"
            LogText "Advice: check and clean up unused files in ${ROOTDIR}tmp. Old files can fill up a disk or contain"
            LogText "private information and should be deleted it not being used actively. Use a tool like lsof to"
            LogText "see which programs possibly are using a particular file. Some systems can cleanup temporary"
            LogText "directories by setting a boot option."
            ReportSuggestion "${TEST_NO}" "Check ${COUNT} files in ${ROOTDIR}tmp which are older than ${TMP_OLD_DAYS} days"
        fi
    fi
#
#################################################################################
#
    # Test        : FILE-6362
    # Description : Check for sticky bit on /tmp
    if [ -d ${ROOTDIR}tmp -a ! -L ${ROOTDIR}tmp ]; then PREQS_MET="YES"; SKIPREASON=""; else PREQS_MET="NO"; SKIPREASON="No /tmp or /tmp is symlinked"; fi
    Register --test-no FILE-6362 --preqs-met ${PREQS_MET} --skip-reason "${SKIPREASON}" --weight L --network NO --category security --description "Checking /tmp sticky bit"
    if [ ${SKIPTEST} -eq 0 ]; then
        # Depending on OS, number of field with 'tmp' differs
        FIND=$(${LSBINARY} -ld ${ROOTDIR}tmp | ${AWKBINARY} '$1 ~ /[tT]/ { print 1 }')
        if [ "${FIND}" = "1" ]; then
            Display --indent 2 --text "- Checking ${ROOTDIR}tmp sticky bit" --result "${STATUS_OK}" --color GREEN
            LogText "Result: sticky bit found on ${ROOTDIR}tmp directory"
            AddHP 3 3
        else
            Display --indent 2 --text "- Checking ${ROOTDIR}tmp sticky bit" --result "${STATUS_WARNING}" --color RED
            ReportSuggestion "${TEST_NO}" "Set the sticky bit on ${ROOTDIR}tmp, to prevent users deleting (by other owned) files in the /tmp directory." "/tmp" "text:Set sticky bit"
            AddHP 0 3
        fi
        unset FIND
    else
        LogText "Result: Sticky bit test (on /tmp) skipped. Possible reason: missing directory, or symlinked directory, or test skipped."
    fi
#
#################################################################################
#
    # Test        : FILE-6363
    # Description : Check for sticky bit on /var/tmp
    if [ -d ${ROOTDIR}var/tmp -a ! -L ${ROOTDIR}var/tmp ]; then PREQS_MET="YES"; SKIPREASON=""; else PREQS_MET="NO"; SKIPREASON="No /var/tmp or /var/tmp is symlinked"; fi
    Register --test-no FILE-6363 --preqs-met ${PREQS_MET} --skip-reason "${SKIPREASON}" --weight L --network NO --category security --description "Checking /var/tmp sticky bit"
    if [ ${SKIPTEST} -eq 0 ]; then
        # Depending on OS, number of field with 'tmp' differs
        FIND=$(${LSBINARY} -ld ${ROOTDIR}var/tmp | ${AWKBINARY} '$1 ~ /[tT]/ { print 1 }')
        if [ "${FIND}" = "1" ]; then
            Display --indent 2 --text "- Checking ${ROOTDIR}var/tmp sticky bit" --result "${STATUS_OK}" --color GREEN
            LogText "Result: sticky bit found on ${ROOTDIR}var/tmp directory"
            AddHP 3 3
        else
            Display --indent 2 --text "- Checking ${ROOTDIR}var/tmp sticky bit" --result "${STATUS_WARNING}" --color RED
            ReportSuggestion "${TEST_NO}" "Set the sticky bit on ${ROOTDIR}var/tmp, to prevent users deleting (by other owned) files in the /var/tmp directory." "/var/tmp" "text:Set sticky bit"
            AddHP 0 3
        fi
        unset FIND
    else
        LogText "Result: Sticky bit test (on /var/tmp) skipped. Possible reason: missing directory, or symlinked directory, or test skipped."
    fi
#
#################################################################################
#
    # Test        : FILE-6366
    # Description : Check for noatime option
    # More info   : especially useful for profile 'desktop' and 'server-storage'

    # Want to contribute to Lynis? Create this test

#
#################################################################################
#
    # Test        : FILE-6368
    # Description : Checking Linux root file system ACL support
    Register --test-no FILE-6368 --os Linux --weight L --network NO --root-only YES --category security --description "Checking ACL support on root file system"
    if [ ${SKIPTEST} -eq 0 ]; then
        FOUND=0
        LogText "Test: Checking acl option on ext[2-4] root file system"
        FIND=$(${MOUNTBINARY} | ${AWKBINARY} '{ if ($3=="/" && $5~/ext[2-4]/) { print $6 } }' | ${GREPBINARY} acl)
        if [ -n "${FIND}" ]; then
            LogText "Result: found ACL option"
            FOUND=1
        else
            LogText "Result: mount point probably mounted with defaults"
            LogText "Test: Checking device which holds root file system"
            # Get device on which root file system is mounted. Use /dev/root if it exists, or
            # else check output of mount
            if [ -b ${ROOTDIR}dev/root ]; then
                FIND1="${ROOTDIR}dev/root"
            else
                # Only determine device if it is EXT2/3/4
                #FIND1=$(mount | ${GREPBINARY} "on / " | ${AWKBINARY} '{ if ($5~/ext[2-4]/) { print $1 }}')
                FIND1=$(${MOUNTBINARY} -t ext2,ext3,ext4 | ${GREPBINARY} "on / " | ${AWKBINARY} '{ print $1 }')
            fi
            # Trying to determine default mount options from EXT2/EXT3/EXT4 file systems
            if [ -n "${FIND1}" ]; then
                LogText "Result: found ${FIND1}"
                LogText "Test: Checking default options on ${FIND1}"
                FIND2=$(${TUNE2FSBINARY} -l ${FIND1} 2> /dev/null | ${GREPBINARY} "^Default mount options" | ${GREPBINARY} "acl")
                if [ -n "${FIND2}" ]; then
                    LogText "Result: found ACL option in default mount options"
                    FOUND=1
                else
                    LogText "Result: no ACL option found in default mount options list"
                fi
            else
                LogText "Result: No file system found with root file system"
            fi
        fi

        LogText "Test: Checking acl option on xfs root file system"
        FIND=$(${MOUNTBINARY} | ${AWKBINARY} '{ if ($3=="/" && $5~/xfs/) { print $6 } }' | ${EGREPBINARY} 'no_acl|no_user_xattr')
        if [ -z "${FIND}" ]; then
            FOUND=1
            # some other tests to do ?
        fi

        if [ ${FOUND} -eq 0 ]; then
            LogText "Result: ACL option NOT enabled on root file system"
            LogText "Additional information: if file access need to be more restricted, ACLs could be used. Install the acl utilities and remount the file system with the acl option"
            LogText "Activate acl support on and active file system with mount -o remount,acl / and add the acl option to the fstab file"
            Display --indent 2 --text "- ACL support root file system" --result "${STATUS_DISABLED}" --color YELLOW
            AddHP 0 1
        else
            LogText "Result: ACL option enabled on root file system"
            Display --indent 2 --text "- ACL support root file system" --result "${STATUS_ENABLED}" --color GREEN
            AddHP 3 3
        fi
    fi
#
#################################################################################
#
    # Test        : FILE-6372
    # Description : Check / mount options for Linux
    # Notes       :
    Register --test-no FILE-6372 --os Linux --weight L --network NO --category security --description "Checking / mount options"
    if [ ${SKIPTEST} -eq 0 ]; then
        if [ -f ${ROOTDIR}etc/fstab ]; then
            FIND=$(${GREPBINARY} -w "/" ${ROOTDIR}etc/fstab | ${GREPBINARY} -v "^#" | ${CUTBINARY} -f1 -d"#" | ${AWKBINARY} '{ if ($2=="/") { print $4 }}')
            NODEV=$(echo ${FIND} | ${AWKBINARY} '{ if ($1 ~ "nodev") { print "YES" } else { print "NO" } }')
            NOEXEC=$(echo ${FIND} | ${AWKBINARY} '{ if ($1 ~ "noexec") { print "YES" } else { print "NO" } }')
            NOSUID=$(echo ${FIND} | ${AWKBINARY} '{ if ($1 ~ "nosuid") { print "YES" } else { print "NO" } }')

            if [ -n "${FIND}" ]; then
                LogText "Result: mount system / is configured with options: ${FIND}"
                if [ "${FIND}" = "defaults" ]; then
                    Display --indent 2 --text "- Mount options of /" --result "${STATUS_OK}" --color GREEN
                else
                    Display --indent 2 --text "- Mount options of /" --result "${STATUS_NON_DEFAULT}" --color YELLOW
                fi
            else
                LogText "Result: no mount point / or expected options found"
            fi
        fi
    fi
#
#################################################################################
#
    # Test        : FILE-6374
    # Description : Check mount options for Linux
    # Notes       : This test determines if the mount point exists. If it does not exist as mount point, yet it is an directory,
    #               you might consider to make it a separate mount point with restrictions.
    #
    #               Depending on the primary goals of a machine, some mount points might be too restrictive. Before applying any
    #               mount flags, test them on a similar or cloned test system.
    #
    #            ---------------------------------------------------------
    #               Mount point              nodev  noexec  nosuid
    #               /boot                      v      v       v
    #               /dev                              v       v
    #               /dev/shm                   v      v       v
    #               /home                      v              v
    #               /run                       v              v
    #               /tmp                       v      v       v
    #               /var                       v              v
    #               /var/log                   v      v       v
    #               /var/log/audit             v      v       v
    #               /var/tmp                   v      v       v
    #            ---------------------------------------------------------

    FILESYSTEMS_TO_CHECK="/boot:nodev,noexec,nosuid /dev:noexec,nosuid /dev/shm:nosuid,nodev,noexec /home:nodev,nosuid /run:nodev,nosuid /tmp:nodev,noexec,nosuid /var:nodev,nosuid /var/log:nodev,noexec,nosuid /var/log/audit:nodev,noexec,nosuid /var/tmp:nodev,noexec,nosuid"
    Register --test-no FILE-6374 --os Linux --weight L --network NO --category security --description "Linux mount options"
    if [ ${SKIPTEST} -eq 0 ]; then
        if [ -f ${ROOTDIR}etc/fstab ]; then
            for I in ${FILESYSTEMS_TO_CHECK}; do
                FILESYSTEM=$(echo ${I} | ${CUTBINARY} -d: -f1)
                EXPECTED_FLAGS=$(echo ${I} | ${CUTBINARY} -d: -f2 | ${SEDBINARY} 's/,/ /g')
                FS_FSTAB=$(${AWKBINARY} -v fs=${FILESYSTEM} '{ if ($2==fs) { print $3 } }' ${ROOTDIR}etc/fstab)
                if [ "${FS_FSTAB}" = "glusterfs" ]; then
                    EXPECTED_FLAGS=$(echo ${EXPECTED_FLAGS} | ${SEDBINARY} 's/\<\(nodev\|nosuid\)\> *//g')
                    if [ -z "${EXPECTED_FLAGS}" ]; then
                        FS_FSTAB=""
                    fi
                fi
                if [ -z "${FS_FSTAB}" ]; then # not found in fstab, check if mounted otherwise
                    FS_FSTAB=$(mount | ${AWKBINARY} -v fs=${FILESYSTEM} '{ if ($3==fs) { print $6 } }')
                    FOUND_FLAGS=$(mount | ${AWKBINARY} -v fs=${FILESYSTEM} '{ if ($1~"[^#]" && $3==fs) { print $6 } }' | ${SEDBINARY} 's/,/ /g' | ${TRBINARY} '\n' ' ')
                else
                    FOUND_FLAGS=$(${AWKBINARY} -v fs=${FILESYSTEM} '{ if ($1~"[^#]" && $2==fs) { print $4 } }' ${ROOTDIR}etc/fstab | ${SEDBINARY} 's/,/ /g' | ${TRBINARY} '\n' ' ')
                fi
                if [ -n "${FS_FSTAB}" ]; then
                    # In awk using caret/circumflex as first character between brackets, means 'not' (instead of beginning of line)
                    LogText "File system:    ${FILESYSTEM}"
                    LogText "Expected flags: ${EXPECTED_FLAGS}"
                    LogText "Found flags:    ${FOUND_FLAGS}"
                    PARTIALLY_HARDENED=0
                    FULLY_HARDENED=1
                    for FLAG in ${EXPECTED_FLAGS}; do
                        FLAG_AVAILABLE=$(echo ${FOUND_FLAGS} | ${GREPBINARY} ${FLAG})
                        if [ -z "${FLAG_AVAILABLE}" ]; then
                            LogText "Result: Could not find mount option ${FLAG} on file system ${FILESYSTEM}"
                            FULLY_HARDENED=0
                        else
                            LogText "Result: GOOD, found mount option ${FLAG} on file system ${FILESYSTEM}"
                            PARTIALLY_HARDENED=1
                        fi
                    done
                    if [ ${FULLY_HARDENED} -eq 1 ]; then
                        LogText "Result: marked ${FILESYSTEM} as fully hardened"
                        Display --indent 2 --text "- Mount options of ${FILESYSTEM}" --result "${STATUS_HARDENED}" --color GREEN
                        AddHP 5 5
                    elif [ ${PARTIALLY_HARDENED} -eq 1 ]; then
                        LogText "Result: marked ${FILESYSTEM} as partially hardened"
                        Display --indent 2 --text "- Mount options of ${FILESYSTEM}" --result "${STATUS_PARTIALLY_HARDENED}" --color YELLOW
                        AddHP 4 5
                    else
                        # if 
                        if ContainsString "defaults" "${FOUND_FLAGS}"; then
                            LogText "Result: marked ${FILESYSTEM} options as default (not hardened)"
                            Display --indent 2 --text "- Mount options of ${FILESYSTEM}" --result "${STATUS_DEFAULT}" --color YELLOW
                            AddHP 3 5
                        else
                            LogText "Result: marked ${FILESYSTEM} options as non-default (unclear about hardening)"
                            Display --indent 2 --text "- Mount options of ${FILESYSTEM}" --result "${STATUS_NON_DEFAULT}" --color YELLOW
                            AddHP 4 5
                        fi
                    fi
                else
                    LogText "Result: file system ${FILESYSTEM} not found in ${ROOTDIR}etc/fstab"
                fi
            done
        fi
        NMOUNTS=$(mount | ${WCBINARY} -l)
        NDEVMOUNTS=$(mount | ${AWKBINARY} '{print $6}' | ${GREPBINARY} -v nodev | ${WCBINARY} -l)
        NEXECMOUNTS=$(mount | ${AWKBINARY} '{print $6}' | ${GREPBINARY} -v noexec | ${WCBINARY} -l)
        NSUIDMOUNTS=$(mount | ${AWKBINARY} '{print $6}' | ${GREPBINARY} -v nosuid | ${WCBINARY} -l)
        NWRITEANDEXECMOUNTS=$(mount | ${AWKBINARY} '{print $6}' | ${GREPBINARY} -v noexec | ${EGREPBINARY} -v '^\(ro[,)]' | ${WCBINARY} -l)
        LogText "Result: Total without nodev:${NDEVMOUNTS} noexec:${NEXECMOUNTS} nosuid:${NSUIDMOUNTS} ro or noexec (W^X): ${NWRITEANDEXECMOUNTS}, of total ${NMOUNTS}"
        Display --indent 2 --text "- Total without nodev:${NDEVMOUNTS} noexec:${NEXECMOUNTS} nosuid:${NSUIDMOUNTS} ro or noexec (W^X): ${NWRITEANDEXECMOUNTS} of total ${NMOUNTS}"
    fi
#
#################################################################################
#
    # Test        : FILE-6376
    # Description : Bind mount the /var/tmp directory to /tmp
    Register --test-no FILE-6376 --os Linux --weight L --network NO --category security --description "Determine if /var/tmp is bound to /tmp"
    if [ ${SKIPTEST} -eq 0 ]; then
        if [ -f ${ROOTDIR}etc/fstab ]; then
            FIND=$(${AWKBINARY} '{ if ($2=="/var/tmp") { print $4 } }' ${ROOTDIR}etc/fstab)
            BIND=$(echo ${FIND} | ${AWKBINARY} '{ if ($1 ~ "bind") { print "YES" } else { print "NO" } }')
            if [ -n "${FIND}" ]; then
                LogText "Result: mount system /var/tmp is configured with options: ${FIND}"
                if [ "${BIND}" = "YES" ]; then
                    Display --indent 2 --text "- /var/tmp is bound to /tmp" --result "${STATUS_OK}" --color GREEN
                    LogText "Result : /var/tmp is bind to /tmp"
                else
                    Display --indent 2 --text "- /var/tmp is not bound to /tmp" --result "${STATUS_NON_DEFAULT}" --color YELLOW
                    LogText "Result: /var/tmp is not bind to /tmp"
                fi
            else
                LogText "Result: no mount point /var/tmp or expected options found"
                if IsVerbose; then Display --indent 2 --text "- /var/tmp is not bound to /tmp" --result "INFO" --color WHITE; fi
            fi
        fi
    fi
#
#################################################################################
#
    # Test        : FILE-6378 TODO
    # Description : Check for nodirtime option

    # Want to contribute to Lynis? Create this test
#
#################################################################################
#
    # Test        : FILE-6380 TODO
    # Description : Check for relatime

    # Want to contribute to Lynis? Create this test
#
#################################################################################
#
    # Test        : FILE-6390 TODO
    # Description : Check writeback/journalling mode (ext3)
    # More info   : data=writeback | data=ordered | data=journal

    # Want to contribute to Lynis? Create this test

#
#################################################################################
#
    # Test        : FILE-6394
    # Description : Check vm.swappiness (Linux)
    Register --test-no FILE-6394 --os Linux --weight L --network NO --category security --description "Determine level of swappiness."
    if [ ${SKIPTEST} -eq 0 ]; then
        SWAPLEVEL=$(${CAT_BINARY} /proc/sys/vm/swappiness)
        LogText "Test: checking level of vm.swappiness: ${SWAPLEVEL}"
        PHYSDISK=$(${LSBLKBINARY} | ${GREPBINARY} -E 'disk|SWAP' | ${GREPBINARY} -B1 SWAP | ${HEADBINARY} -n1 | ${AWKBINARY} '{print $1}')
        if [ ${SWAPLEVEL} -gt 60 ]; then
            LogText "Result: vm.swappiness=${SWAPLEVEL} meaning that swapping is more frequent than default."
            # Check if swap is on a HDD or SDD for frequent swapping
            if [ -d "/sys/block/${PHYSDISK}" ]; then
                HDDORSDD=$(${CAT_BINARY} "/sys/block/${PHYSDISK}/queue/rotational")
                if [ ${HDDORSDD} -eq 1 ]; then
                    ReportSuggestion "${TEST_NO}" "vm.swappiness set to: ${SWAPLEVEL} > 60 (default) - consider installing an SSD for swap partition for better performance."
                fi
            fi
        elif [ ${SWAPLEVEL} -eq 0 ]; then
            LogText "Result: vm.swappiness=${SWAPLEVEL} meaning swapping is disabled."
            ReportSuggestion "${TEST_NO}" "vm.swappiness set to: ${SWAPLEVEL}. Consider setting value to minimum of 1 for minimizing swappiness, but not quite disabling it. Will prevent OOM killer from killing processes when running out of physical memory."
        elif [ ${SWAPLEVEL} -eq 1 ]; then
            LogText "Result: vm.swappiness=${SWAPLEVEL} meaning that swapping can still occur but at very minimum."
        elif [ ${SWAPLEVEL} -eq 10 ]; then
            LogText "Result: vm.swappiness=${SWAPLEVEL} which is the preferred setting for database servers."
        elif [ ${SWAPLEVEL} -lt 60 ]; then
            LogText "Result: vm.swappiness=${SWAPLEVEL} meaning that swapping is less frequent than default. This is only recommended for servers."
        else
            LogText "Result: vm.swappiness=${SWAPLEVEL} which is the standard level of swappiness and works well for desktop systems."
        fi
        if IsVerbose; then Display --indent 2 --text "- Swappiness: ${SWAPLEVEL}" --result "INFO" --color WHITE; fi
    fi
#
#################################################################################
#
    # Test        : FILE-6398 TODO
    # Description : Check if JBD (Journal Block Device) driver is loaded

    # Want to contribute to Lynis? Create this test

#
#################################################################################
#
    # Test        : FILE-6410
    # Description : Checking locate database (file index)
    # Notes       : Linux     /var/lib/mlocate/mlocate.db or /var/lib/slocate/slocate.db
    #                       or /var/cache/locate/locatedb
    #               FreeBSD /var/db/locate.database
    if [ ! "${LOCATEBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no FILE-6410 --preqs-met ${PREQS_MET} --os Linux --weight L --network NO --category security --description "Checking Locate database"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Checking locate database"
        FOUND=0
        LOCATE_DBS="${ROOTDIR}var/lib/mlocate/mlocate.db ${ROOTDIR}var/lib/locate/locatedb ${ROOTDIR}var/lib/locatedb ${ROOTDIR}var/lib/slocate/slocate.db ${ROOTDIR}var/cache/locate/locatedb ${ROOTDIR}var/db/locate.database"
        for FILE in ${LOCATE_DBS}; do
            if [ -f ${FILE} ]; then
                LogText "Result: locate database found (${FILE})"
                FOUND=1
                LOCATE_DB="${FILE}"
            else
                LogText "Result: file ${FILE} not found"
            fi
        done
        if [ ${FOUND} -eq 1 ]; then
            Display --indent 2 --text "- Checking Locate database" --result "${STATUS_FOUND}" --color GREEN
            Report "locate_db=${LOCATE_DB}"
        else
            LogText "Result: database not found"
            Display --indent 2 --text "- Checking Locate database" --result "${STATUS_NOT_FOUND}" --color YELLOW
            ReportSuggestion "${TEST_NO}" "The database required for 'locate' could not be found. Run 'updatedb' or 'locate.updatedb' to create this file."
        fi
    fi
#
#################################################################################
#
    # Test        : FILE-6420 TODO
    # Description : Check automount process

    # Want to contribute to Lynis? Create this test

#
#################################################################################
#
    # Test        : FILE-6422 TODO
    # Description : Check automount maps (files or for example LDAP based)
    # Notes       : Warn when automounter is running

    # Want to contribute to Lynis? Create this test

#
#################################################################################
#
    # Test        : FILE-6424 TODO
    # Description : Check automount map files

    # Want to contribute to Lynis? Create this test

#
#################################################################################
#
    # Test        : FILE-6425 TODO
    # Description : Check mounted files systems via automounter
    # Notes       : Warn when no systems are mounted?

    # Want to contribute to Lynis? Create this test

#
#################################################################################
#
    # Test        : FILE-6430
    # Description : Disable mounting of some filesystems
    # Rationale   : Unless there is a specific reason to use a particular file system, disable it.
    # Data        : cramfs freevxfs hfs hfsplus jffs2 squashfs udf
    Register --test-no FILE-6430 --weight L --network NO --category security --description "Disable mounting of some filesystems"
    if [ ${SKIPTEST} -eq 0 ]; then
        if [ -n "${LSMODBINARY}" -a -f /proc/modules ]; then
            Display --indent 2 --text "- Disable kernel support of some filesystems"
            LIST_FS_NOT_SUPPORTED="cramfs freevxfs hfs hfsplus jffs2 squashfs udf"
            FOUND=0
            AVAILABLE_FS=""
            AVAILABLE_MODPROBE_FS=""
            for FS in ${LIST_FS_NOT_SUPPORTED}; do
                # Check if filesystem is present in modprobe output
                FIND=$(${MODPROBEBINARY} -v -n ${FS} 2>/dev/null | ${EGREPBINARY} "/${FS}.ko" | ${TAILBINARY} -1)
                if [ -n "${FIND}" ]; then
                    LogText "Result: found ${FS} support in the kernel (output = ${FIND})"
                    Debug "Module ${FS} present in the kernel"
                    LogText "Test: Checking if ${FS} is active"
                    # Check if FS is present in lsmod output
                    FIND=$(${LSMODBINARY} | ${EGREPBINARY} "^${FS}")
                    if IsEmpty "${FIND}"; then
                        LogText "Result: module ${FS} is currently not loaded in the kernel."
                        AddHP 2 3
                        if IsDebug; then Display --indent 6 --text "- Module ${FS} not loaded (lsmod)" --result OK --color GREEN; fi
                    else
                        LogText "Result: module ${FS} is loaded in the kernel"
                        Display --indent 4 --text "- Module $FS loaded in the kernel (lsmod)" --result "FOUND" --color WHITE
                        FOUND=1
                        AVAILABLE_MODPROBE_FS="${AVAILABLE_MODPROBE_FS}${FS} "
                    fi
                else
                    AddHP 3 3
                    if IsDebug; then Display --indent 6 --text "- Module ${FS} not present in the kernel" --result OK --color GREEN; fi
                fi
                FIND=$(${LSBINARY} ${ROOTDIR}etc/modprobe.d/* 2> /dev/null)
                if [ -n "${FIND}" ]; then
		                FIND1=$(${EGREPBINARY} "blacklist ${FS}" ${ROOTDIR}etc/modprobe.d/* | ${GREPBINARY} -v "#")
		                FIND2=$(${EGREPBINARY} "install ${FS} /bin/true" ${ROOTDIR}etc/modprobe.d/* | ${GREPBINARY} -v "#")
                    if [ -n "${FIND1}" ] || [ -n "${FIND2}" ]; then
                        Display --indent 4 --text "- Module $FS is blacklisted" --result "OK" --color GREEN
                        LogText "Result: module ${FS} is blacklisted"
                    fi
		            fi
            done
            if [ ${FOUND} -eq 1 ]; then
                Display --indent 4 --text "- Discovered kernel modules: ${AVAILABLE_MODPROBE_FS}"
                ReportSuggestion "${TEST_NO}" "Consider disabling unused kernel modules" "/etc/modprobe.d/blacklist.conf" "Add 'install MODULENAME /bin/true' (without quotes)"
            fi
        else
            LogText "Test skipped lsmod binary not found or /proc/modules can not be opened"
        fi
        unset AVAILABLE_FS AVAILABLE_MODPROBE_FS
    fi
#
#################################################################################
#

WaitForKeyPress

#
#================================================================================
# Lynis - Security Auditing and System Hardening for Linux and UNIX - https://cisofy.com