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|
#!/bin/sh
#################################################################################
#
# Lynis
# ------------------
#
# Copyright (c) Michael Boelen, CISOfy, and many contributors.
#
# Website : https://cisofy.com/
# Blog : https://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)
# hidepid textual values available kernel >= 5.8 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";
elif [ ${LINUX_KERNEL_MAJOR} -ge 4 ]; 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 [ ${SKIPTEST} -eq 0 ]; then
# Proc should be mounted with 'hidepid=2' or 'hidepid=1' at least
# https://www.kernel.org/doc/html/latest/filesystems/proc.html#chapter-4-configuring-procfs
LogText "Test: check proc mount with incorrect mount options"
FIND=$(${MOUNTBINARY} | ${GREPBINARY} -E "${ROOTDIR}proc " | ${GREPBINARY} -E -o "hidepid=([0-9]|[a-z][a-z]*)")
if [ "${FIND}" = "hidepid=4" -o "${FIND}" = "hidepid=ptraceable" ]; then # https://lwn.net/Articles/817137/
Display --indent 2 --text "- Testing /proc mount (hidepid)" --result "${STATUS_OK}" --color GREEN
LogText "Result: proc mount mounted with ${FIND}"
AddHP 3 3
elif [ "${FIND}" = "hidepid=2" -o "${FIND}" = "hidepid=invisible" ]; then
Display --indent 2 --text "- Testing /proc mount (hidepid)" --result "${STATUS_OK}" --color GREEN
LogText "Result: proc mount mounted with ${FIND}"
AddHP 3 3
elif [ "${FIND}" = "hidepid=1" -o "${FIND}" = "hidepid=noaccess" ]; then
Display --indent 2 --text "- Testing /proc mount (hidepid)" --result "${STATUS_OK}" --color GREEN
LogText "Result: proc mount mounted with ${FIND}"
AddHP 2 3
elif [ -z "${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 } }' | ${GREPBINARY} -E 'no_acl|no_user_xattr')
if [ -z "${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 ${FS} not present in the kernel" --result OK --color GREEN; fi
fi
for SUBDIR in "${ROOTDIR}etc" "${ROOTDIR}usr/lib"; do
if [ -d "${SUBDIR}/modprobe.d" ]; then
LogText "Result: directory ${SUBDIR}/modprobe.d exists"
FIND=$(${LSBINARY} "${SUBDIR}/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"
break
fi
fi
fi
done
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
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