mirror of https://github.com/CISOfy/lynis.git
912 lines
49 KiB
Bash
912 lines
49 KiB
Bash
#!/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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# Copyright 2007-2013, Michael Boelen
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# Copyright 2007-2021, CISOfy
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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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# File systems
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#
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#################################################################################
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#
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# Number of days to mark a file as old
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TMP_OLD_DAYS=90
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LVM_VG_USED=0
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#
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#################################################################################
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#
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InsertSection "${SECTION_FILE_SYSTEMS}"
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#
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#################################################################################
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#
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# Test : FILE-6310
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# Description : Checking if some mount points are separated from /
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# Goal : Users should not be able to fill their home directory or temporary directory and creating a Denial of Service
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Register --test-no FILE-6310 --weight L --network NO --category security --description "Checking /tmp, /home and /var directory"
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if [ ${SKIPTEST} -eq 0 ]; then
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Display --indent 2 --text "- Checking mount points"
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SEPARATED_FILESYTEMS="/home /tmp /var"
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for I in ${SEPARATED_FILESYTEMS}; do
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LogText "Test: Checking if ${I} is mounted separately or mounted on / file system"
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if [ -L ${I} ]; then
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ShowSymlinkPath ${I}
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LogText "Result: ${I} is a symlink. Manual check required to determine exact file system options"
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ReportSuggestion "${TEST_NO}" "Symlinked mount point needs to be checked manually" "${I}" ""
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Display --indent 4 --text "- Checking ${I} mount point" --result SYMLINK --color WHITE
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elif [ -d ${I} ]; then
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LogText "Result: directory ${I} exists"
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case "${OS}" in
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"AIX") FIND=$(${MOUNTBINARY} | ${AWKBINARY} -v MP=${I} '{ if ($2==MP) { print $2 }}') ;;
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"HP-UX") FIND=$(${MOUNTBINARY} | ${AWKBINARY} -v MP=${I} '{ if ($1==MP) { print $1 }}') ;;
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*) FIND=$(${MOUNTBINARY} | ${AWKBINARY} -v MP=${I} '{ if ($3==MP) { print $3 }}') ;;
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esac
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if IsEmpty "${FIND}"; then
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LogText "Result: ${I} not found in mount list. Directory most likely stored on / file system"
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Display --indent 4 --text "- Checking ${I} mount point" --result "${STATUS_SUGGESTION}" --color YELLOW
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ReportSuggestion "${TEST_NO}" "To decrease the impact of a full ${I} file system, place ${I} on a separate partition"
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AddHP 9 10
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else
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LogText "Result: found ${I} as a separated mount point"
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Display --indent 4 --text "- Checking ${I} mount point" --result "${STATUS_OK}" --color GREEN
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AddHP 10 10
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fi
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else
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LogText "Result: directory ${I} does not exist"
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fi
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done
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fi
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#
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#################################################################################
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#
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# Test : FILE-6311
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# Description : Checking LVM Volume Groups
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# Notes : No volume groups found is sent to STDERR for unclear reasons. Filtering both STDERR redirecting and grep.
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if [ ! "${VGDISPLAYBINARY}" = "" -o ! "${LSVGBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
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Register --test-no FILE-6311 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Checking LVM volume groups"
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if [ ${SKIPTEST} -eq 0 ]; then
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LogText "Test: Checking for LVM volume groups"
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case ${OS} in
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AIX)
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FIND=$(${LSVGBINARY} -o)
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;;
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Linux)
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FIND=$(${VGDISPLAYBINARY} 2> /dev/null | ${GREPBINARY} -v "No volume groups found" | ${GREPBINARY} "VG Name" | ${AWKBINARY} '{ print $3 }' | ${SORTBINARY})
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;;
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*)
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ReportException "${TEST_NO}:1" "Don't know this specific operating system yet, while volume group manager was found"
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;;
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esac
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if [ -n "${FIND}" ]; then
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LogText "Result: found one or more volume groups"
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for I in ${FIND}; do
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LogText "Found LVM volume group: ${I}"
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Report "lvm_volume_group[]=${I}"
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done
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LVM_VG_USED=1
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Display --indent 2 --text "- Checking LVM volume groups" --result "${STATUS_FOUND}" --color GREEN
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else
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LogText "Result: no LVM volume groups found"
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if IsVerbose; then Display --indent 2 --text "- Checking LVM volume groups" --result "${STATUS_NONE}" --color WHITE; fi
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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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# Test : FILE-6312
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# Description : Checking LVM volumes
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if [ ${LVM_VG_USED} -eq 1 ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
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Register --test-no FILE-6312 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Checking LVM volumes"
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if [ ${SKIPTEST} -eq 0 ]; then
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LogText "Test: Checking for LVM volumes"
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case ${OS} in
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AIX)
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ACTIVE_VG_LIST=$(${LSVGBINARY} -o)
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FIND=$(for I in ${ACTIVE_VG_LIST}; do ${LSVGBINARY} -l ${I} | ${AWKBINARY} 'NR>2 { print $1 }'; done)
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;;
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Linux)
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FIND=$(${LVDISPLAYBINARY} | ${GREPBINARY} -v "No volume groups found" | ${GREPBINARY} "LV Name" | ${AWKBINARY} '{ print $3 }' | ${SORTBINARY})
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;;
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*)
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ReportException "${TEST_NO}:1" "Need specific test for gathering volume manager data"
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;;
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esac
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if [ ! "${FIND}" = "" ]; then
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LogText "Result: found one or more volumes"
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for I in ${FIND}; do
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LogText "Found LVM volume: ${I}"
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Report "lvm_volume[]=${I}"
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done
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Display --indent 4 --text "- Checking LVM volumes" --result "${STATUS_FOUND}" --color GREEN
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else
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LogText "Result: no LVM volume groups found"
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Display --indent 4 --text "- Checking LVM volumes" --result "${STATUS_NONE}" --color WHITE
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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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# Test : FILE-6316
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# Description : Checking /etc/fstab file permissions
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#Register --test-no FILE-6316 --os Linux --weight L --network NO --category security --description "Checking /etc/fstab"
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#if [ ${SKIPTEST} -eq 0 ]; then
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# 644
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#
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#################################################################################
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#
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# Test : FILE-6323
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# Description : Checking Linux EXT2, EXT3, EXT4 file systems
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Register --test-no FILE-6323 --os Linux --weight L --network NO --category security --description "Checking EXT file systems"
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if [ ${SKIPTEST} -eq 0 ]; then
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LogText "Test: Checking for Linux EXT file systems"
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FIND=$(${MOUNTBINARY} -t ext2,ext3,ext4 | ${AWKBINARY} '{ print $3","$5 }')
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if [ -n "${FIND}" ]; then
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LogText "Result: found one or more EXT file systems"
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for I in ${FIND}; do
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FILESYSTEM=$(echo ${I} | ${CUTBINARY} -d ',' -f1)
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FILETYPE=$(echo ${I} | ${CUTBINARY} -d ',' -f2)
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LogText "File system: ${FILESYSTEM} (type: ${FILETYPE})"
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Report "file_systems_ext[]=${FILESYSTEM}|${FILETYPE}|"
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done
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else
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LogText "Result: no EXT file systems found"
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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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# Test : FILE-6324
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# Description : Checking Linux XFS file systems
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Register --test-no FILE-6324 --os Linux --weight L --network NO --category security --description "Checking XFS file systems"
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if [ ${SKIPTEST} -eq 0 ]; then
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LogText "Test: Checking for Linux XFS file systems"
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FIND=$(${MOUNTBINARY} -t xfs | ${AWKBINARY} '{ print $3","$5 }')
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if [ -n "${FIND}" ]; then
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LogText "Result: found one or more XFS file systems"
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for I in ${FIND}; do
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FILESYSTEM=$(echo ${I} | ${CUTBINARY} -d ',' -f1)
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FILETYPE=$(echo ${I} | ${CUTBINARY} -d ',' -f2)
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LogText "File system: ${FILESYSTEM} (type: ${FILETYPE})"
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Report "file_systems_xfs[]=${FILESYSTEM}|${FILETYPE}|"
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done
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else
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LogText "Result: no XFS file systems found"
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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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# Test : FILE-6329
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# Description : Query all FFS/UFS mounts from /etc/fstab
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if [ -f /etc/fstab ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
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Register --test-no FILE-6329 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Checking FFS/UFS file systems"
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if [ ${SKIPTEST} -eq 0 ]; then
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LogText "Test: Query /etc/fstab for available FFS/UFS mount points"
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FIND=$(${AWKBINARY} '{ if ($3 == "ufs" || $3 == "ffs" ) { print $1":"$2":"$3":"$4":" }}' /etc/fstab)
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if [ -z "${FIND}" ]; then
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if IsVerbose; then Display --indent 2 --text "- Querying FFS/UFS mount points (fstab)" --result "${STATUS_NONE}" --color WHITE; fi
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LogText "Result: unable to find any single mount point (FFS/UFS)"
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else
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Display --indent 2 --text "- Querying FFS/UFS mount points (fstab)" --result "${STATUS_FOUND}" --color GREEN
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Report "filesystem[]=ufs"
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for I in ${FIND}; do
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LogText "FFS/UFS mount found: ${I}"
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Report "mountpoint_ufs[]=${I}"
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done
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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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# Test : FILE-6330
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# Description : Query ZFS mounts
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# Note : mount -p does not work under Linux
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Register --test-no FILE-6330 --os FreeBSD --weight L --network NO --category security --description "Checking ZFS file systems"
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if [ ${SKIPTEST} -eq 0 ]; then
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LogText "Test: Discover for available ZFS mount points"
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FIND=$(${MOUNTBINARY} -p | ${AWKBINARY} '{ if ($3 == "zfs") { print $1":"$2":"$3":"$4":" }}')
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if [ -z "${FIND}" ]; then
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Display --indent 2 --text "- Querying ZFS mount points (mount -p)" --result "${STATUS_NONE}" --color WHITE
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LogText "Result: unable to find any single mount point (ZFS)"
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else
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Display --indent 2 --text "- Querying ZFS mount points (mount -p)" --result "${STATUS_FOUND}" --color GREEN
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Report "filesystem[]=zfs"
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for I in ${FIND}; do
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LogText "ZFS mount found: ${I}"
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Report "mountpoint_zfs[]=${I}"
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done
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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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# Test : FILE-6439
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# Description : Query all HAMMER PFS mounts from /etc/fstab
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Register --test-no FILE-6439 --os DragonFly --weight L --network NO --category security --description "Checking HAMMER PFS mounts"
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if [ ${SKIPTEST} -eq 0 ]; then
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LogText "Test: Query /etc/fstab for available HAMMER PFS mount points"
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FIND=$(${MOUNTBINARY} -p | ${AWKBINARY} '{ if ($3 == "null") { print $1":"$2":"$3":"$4":" }}')
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if [ -z "${FIND}" ]; then
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Display --indent 2 --text "- Querying HAMMER PFS mount points (mount -p)" --result "${STATUS_NONE}" --color WHITE
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LogText "Result: unable to find any single PFS mount point"
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else
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Display --indent 2 --text "- Querying HAMMER PFS mount points (mount -p)" --result "${STATUS_FOUND}" --color GREEN
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Report "filesystem[]=hammer"
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for I in ${FIND}; do
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LogText "HAMMER mount found: ${I}"
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Report "mountpoint_hammer[]=${I}"
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done
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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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# Test : FILE-6332
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# Description : Check swap partitions
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if [ -f /etc/fstab ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
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Register --test-no FILE-6332 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Checking swap partitions"
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if [ ${SKIPTEST} -eq 0 ]; then
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FOUND=0
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LogText "Test: query swap partitions from /etc/fstab file"
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# Check if third field contains 'swap'
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FIND=$(${AWKBINARY} '{ if ($2=="swap" || $3=="swap") { print $1 }}' /etc/fstab | ${GREPBINARY} -v "^#")
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for I in ${FIND}; do
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FOUND=1
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REAL=""
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UUID=""
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LogText "Swap partition found: ${I}"
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# TODO Add a test if partition is not a normal partition (e.g. UUID=)
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# Can be ^/dev/mapper/vg-name_lv-name
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# Can be ^/dev/partition
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# Test for UUID usage (e.g. UUID=uuid --> /dev/disk/by-uuid/<uuid>)
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HAS_UUID=$(echo ${I} | ${GREPBINARY} "^UUID=")
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if [ -n "${HAS_UUID}" ]; then
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UUID=$(echo ${HAS_UUID} | ${AWKBINARY} -F= '{ print $2 }')
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LogText "Result: Using ${UUID} as UUID"
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if [ -n "${BLKIDBINARY}" ]; then
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FIND2=$(${BLKIDBINARY} | ${AWKBINARY} '{ if ($2=="UUID=\"${UUID}\"") print $1 }' | ${SEDBINARY} 's/:$//')
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if [ -n "${FIND2}" ]; then
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REAL="${FIND2}"
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fi
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else
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LogText "Result: blkid binary not found, trying by checking device listing"
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sFILE=""
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if [ -L /dev/disk/by-uuid/${UUID} ]; then
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LogText "Result: found disk via /dev/disk/by-uuid listing"
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ShowSymlinkPath /dev/disk/by-uuid/${UUID}
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if [ -n "${sFILE}" ]; then
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REAL="${sFILE}"
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LogText "Result: disk is ${REAL}"
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fi
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else
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LogText "Result: no symlink found to /dev/disk/by-uuid/${UUID}"
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fi
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fi
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fi
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# Set real device
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if [ -z "${REAL}" ]; then
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REAL="${I}"
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fi
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Report "swap_partition[]=${I},${REAL},"
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done
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if [ ${FOUND} -eq 1 ]; then
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Display --indent 2 --text "- Query swap partitions (fstab)" --result "${STATUS_OK}" --color GREEN
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else
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Display --indent 2 --text "- Query swap partitions (fstab)" --result "${STATUS_NONE}" --color YELLOW
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LogText "Result: no swap partitions found in /etc/fstab"
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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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# Test : FILE-6336
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# Description : Check swap mount options
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# Examples : [partition] swap swap defaults 0 0
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# [partition] none swap sw 0 0
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if [ -f /etc/fstab ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
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Register --test-no FILE-6336 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Checking swap mount options"
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if [ ${SKIPTEST} -eq 0 ]; then
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# Swap partitions should be mounted with 'sw' or 'swap'
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LogText "Test: check swap partitions with incorrect mount options"
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FIND=$(${AWKBINARY} '{ if ($3=="swap" && ($4!~/sw/ && $4!="defaults")) { print $1 }}' /etc/fstab)
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if [ -z "${FIND}" ]; then
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Display --indent 2 --text "- Testing swap partitions" --result "${STATUS_OK}" --color GREEN
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LogText "Result: all swap partitions have correct options (sw or swap)"
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else
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Display --indent 2 --text "- Testing swap partitions" --result "${STATUS_CHECK_NEEDED}" --color YELLOW
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LogText "Result: possible incorrect mount options used for mounting swap partition (${FIND})"
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#ReportWarning "${TEST_NO}" "Possible incorrect mount options used for swap partition (${FIND})"
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ReportSuggestion "${TEST_NO}" "Check your /etc/fstab file for swap partition mount options"
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LogText "Notes: usually swap partition have 'sw' or 'swap' in the options field (4th)"
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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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# Test : FILE-6344
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# Description : Check proc mount options (Linux >=3.3 only)
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# hidepid textual values available kernel >= 5.8 only)
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# Examples : proc /proc proc defaults,hidepid=2 0 0
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# Goal : Users should not be able to see processes of other users
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if [ "${OS}" = "Linux" -a -f ${ROOTDIR}proc/version ]; then
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LINUX_KERNEL_MAJOR=$(echo $OS_KERNELVERSION | ${AWKBINARY} -F. '{print $1}')
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LINUX_KERNEL_MINOR=$(echo $OS_KERNELVERSION | ${AWKBINARY} -F. '{print $2}')
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if [ -n "${LINUX_KERNEL_MAJOR}" -a -n "${LINUX_KERNEL_MINOR}" ]; then
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if [ ${LINUX_KERNEL_MAJOR} -ge 3 -a ${LINUX_KERNEL_MINOR} -ge 3 ]; then
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PREQS_MET="YES";
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elif [ ${LINUX_KERNEL_MAJOR} -ge 4 ]; then
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PREQS_MET="YES";
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else
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PREQS_MET="NO";
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fi
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else
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PREQS_MET="NO";
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fi
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fi
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Register --test-no FILE-6344 --os Linux --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Checking proc mount options"
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if [ ${SKIPTEST} -eq 0 ]; then
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# Proc should be mounted with 'hidepid=2' or 'hidepid=1' at least
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# https://www.kernel.org/doc/html/latest/filesystems/proc.html#chapter-4-configuring-procfs
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LogText "Test: check proc mount with incorrect mount options"
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FIND=$(${MOUNTBINARY} | ${GREPBINARY} -E "${ROOTDIR}proc " | ${GREPBINARY} -E -o "hidepid=([0-9]|[a-z][a-z]*)")
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if [ "${FIND}" = "hidepid=4" -o "${FIND}" = "hidepid=ptraceable" ]; then # https://lwn.net/Articles/817137/
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Display --indent 2 --text "- Testing /proc mount (hidepid)" --result "${STATUS_OK}" --color GREEN
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LogText "Result: proc mount mounted with ${FIND}"
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AddHP 3 3
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elif [ "${FIND}" = "hidepid=2" -o "${FIND}" = "hidepid=invisible" ]; then
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Display --indent 2 --text "- Testing /proc mount (hidepid)" --result "${STATUS_OK}" --color GREEN
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LogText "Result: proc mount mounted with ${FIND}"
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AddHP 3 3
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elif [ "${FIND}" = "hidepid=1" -o "${FIND}" = "hidepid=noaccess" ]; then
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Display --indent 2 --text "- Testing /proc mount (hidepid)" --result "${STATUS_OK}" --color GREEN
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LogText "Result: proc mount mounted with ${FIND}"
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AddHP 2 3
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elif [ -z "${FIND}" ]; then
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# HIDEPID1_SUGGESTION=" (or at least hidepid=1)"
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AddHP 0 3
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Display --indent 2 --text "- Testing /proc mount (hidepid)" --result "${STATUS_SUGGESTION}" --color YELLOW
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LogText "Result: /proc filesystem is not mounted with option hidepid=1 or hidepid=2"
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# TODO ReportSuggestion "${TEST_NO}" "Consider mounting /proc via /etc/fstab with mount option hidepid=2" "/proc" "-"
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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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# Test : FILE-6354
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# Description : Search files within /tmp which are older than 3 months
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if [ -d ${ROOTDIR}tmp ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
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Register --test-no FILE-6354 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Searching for old files in /tmp"
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if [ ${SKIPTEST} -eq 0 ]; then
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LogText "Test: Searching for old files in ${ROOTDIR}tmp"
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# Search for files only in ${ROOTDIR}tmp, with an access time older than X days
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FIND=$(${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 } }' | ${GREPBINARY} -E 'no_acl|no_user_xattr')
|
|
if [ -z "${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 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 | ${GREPBINARY} -E -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
|
|
# Description : Check if JBD (Journal Block Device) driver is loaded
|
|
# Notes : Test is temporarily disabled, as JBD might be in a kernel (built-in) - https://github.com/CISOfy/lynis/issues/1508
|
|
# Register --test-no FILE-6398 --os Linux --weight L --network NO --category security --description "Checking if JBD (Journal Block Device) driver is loaded"
|
|
# if [ ${SKIPTEST} -eq 0 ]; then
|
|
# LogText "Test: Checking if JBD (Journal Block Device) driver is loaded"
|
|
# NOTINUSE=0
|
|
# # Only perform testing if we know that KRNL-5723 performed tests
|
|
# if [ ${MONOLITHIC_KERNEL_TESTED} -eq 1 ]; then
|
|
# # Cannot check if driver is loaded/present if kernel is monolithic
|
|
# if [ ${MONOLITHIC_KERNEL} -eq 0 ]; then
|
|
# JBD=$(${LSMODBINARY} | ${GREPBINARY} ^jbd)
|
|
# if [ -n "${JBD}" ]; then
|
|
# LogText "Result: JBD driver is loaded"
|
|
# INUSE=$(echo ${JBD} | ${AWKBINARY} '{if ($3 -ne 0) {print $4}}')
|
|
# if [ -n "${INUSE}" ]; then
|
|
# LogText "Result: JBD driver is in use by drivers: ${INUSE}"
|
|
# Report "JBD driver is in use by drivers: ${INUSE}"
|
|
# Display --indent 2 --text "- JBD driver loaded and in use" --result "${STATUS_OK}" --color GREEN
|
|
# else
|
|
# NOTINUSE=1
|
|
# LogText "Result: JBD driver loaded, but not in use"
|
|
# Report "JBD driver is loaded, but not in use."
|
|
# Display --indent 2 --text "- JBD driver loaded, but not in use" --result "${STATUS_SUGGESTION}" --color YELLOW
|
|
# fi
|
|
# else
|
|
# NOTINUSE=2
|
|
# LogText "Result: JBD driver not loaded"
|
|
# Report "JBD driver not loaded."
|
|
# Display --indent 2 --text "- JBD driver is not loaded" --result "${STATUS_CHECK_NEEDED}" --color YELLOW
|
|
# fi
|
|
# if [ ${NOTINUSE} -eq 1 ]; then
|
|
# ReportSuggestion "${TEST_NO}" "The JBD (Journal Block Device) driver is loaded but not in use." "You are currently not using any filesystems with journaling, i.e. you have greater risk of data corruption in case of system crash."
|
|
# elif [ ${NOTINUSE} -eq 2 ]; then
|
|
# ReportSuggestion "${TEST_NO}" "The JBD (Journal Block Device) driver is not loaded." "Since boot-time, you have not been using any filesystems with journaling. Alternatively, reason could be driver is blacklisted."
|
|
# fi
|
|
# else
|
|
# Display --indent 2 --text "- JBD driver: unable to check" --result "${STATUS_UNKNOWN}" --color YELLOW
|
|
# LogText "Kernel is monolithic - cannot check if JBD driver is part of compiled kernel."
|
|
# fi
|
|
# else
|
|
# Display --indent 2 --text "- JBD driver: test skipped" --result "${STATUS_UNKNOWN}" --color YELLOW
|
|
# LogText "Test skipped as the kernel type (monolithic/modular) is unknown"
|
|
# fi
|
|
# fi
|
|
#
|
|
#################################################################################
|
|
#
|
|
# 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/cache/locate/locatedb ${ROOTDIR}var/db/locate.database ${ROOTDIR}var/lib/locate/locatedb ${ROOTDIR}var/lib/locatedb ${ROOTDIR}var/lib/mlocate/mlocate.db ${ROOTDIR}var/lib/plocate/plocate.db ${ROOTDIR}var/lib/slocate/slocate.db"
|
|
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 | ${GREPBINARY} -E "/${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} | ${GREPBINARY} -E "^${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=$(${GREPBINARY} -E "^blacklist[[:space:]]+${FS}$" ${ROOTDIR}etc/modprobe.d/* | ${GREPBINARY} -v "#")
|
|
FIND2=$(${GREPBINARY} -E "^install[[:space:]]+${FS}[[:space:]]+/bin/(true|false)$" ${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
|