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#!/bin/sh
#################################################################################
#
# Lynis
# ------------------
#
# Copyright 2007-2013, Michael Boelen
# Copyright 2007-2021, CISOfy
#
# Website : https://cisofy.com
# Blog : http://linux-audit.com
# GitHub : https://github.com/CISOfy/lynis
#
# Lynis comes with ABSOLUTELY NO WARRANTY. This is free software, and you are
# welcome to redistribute it under the terms of the GNU General Public License.
# See LICENSE file for usage of this software.
#
#################################################################################
#
# Cryptography
#
#################################################################################
#
RNG_FOUND=0
#
#################################################################################
#
InsertSection "${SECTION_CRYPTOGRAPHY}"
#
#################################################################################
#
# Test : CRYP-7902
# Description : check for expired SSL certificates
if [ -n "${OPENSSLBINARY}" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no CRYP-7902 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check expire date of SSL certificates"
if [ ${SKIPTEST} -eq 0 ]; then
COUNT_EXPIRED=0
COUNT_TOTAL=0
FOUNDPROBLEM=0
SKIP=0
sSSL_PATHS=$(echo ${SSL_CERTIFICATE_PATHS} | ${SEDBINARY} 's/:space:/__space__/g' | ${SEDBINARY} 's/:/ /g')
sSSL_PATHS=$(echo ${sSSL_PATHS} | ${SEDBINARY} 's/^ //' | ${SORTBINARY} -u)
LogText "Paths to scan: ${sSSL_PATHS}"
IGNORE_PATHS_PRINT=$(echo ${SSL_CERTIFICATE_PATHS_TO_IGNORE} | ${SEDBINARY} 's/:/, /g' | ${SEDBINARY} 's/__space__/ /g' | ${SEDBINARY} 's/^ //' | ${SORTBINARY} -u)
LogText "Paths to ignore: ${IGNORE_PATHS_PRINT}"
for DIR in ${sSSL_PATHS}; do
COUNT_DIR=0
if [ -d ${DIR} ]; then
FileIsReadable ${DIR}
if [ ${CANREAD} -eq 1 ]; then
LASTSUBDIR=""
LogText "Result: found directory ${DIR}"
# Search for certificate files
FILES=$(${FINDBINARY} ${DIR} -type f 2> /dev/null | ${GREPBINARY} -E ".cer$|.crt$|.der$|.pem$|^cert" | ${SORTBINARY} | ${SEDBINARY} 's/ /__space__/g')
for FILE in ${FILES}; do
FILE=$(echo ${FILE} | ${SEDBINARY} 's/__space__/ /g')
# See if we need to skip this path
SUBDIR=$(echo ${FILE} | ${AWKBINARY} -F/ 'sub(FS $NF,x)' | ${SEDBINARY} 's/__space__/ /g')
# If we discover a new directory, do evaluation
#Debug "File : ${FILE}"
#Debug "Lastdir: ${LASTSUBDIR}"
#Debug "Curdir : ${SUBDIR}"
if [ ! "${SUBDIR}" = "${LASTSUBDIR}" ]; then
SKIP=0
# Now check if this path is on the to-be-ignored list
for D in ${SSL_CERTIFICATE_PATHS_TO_IGNORE}; do
if ContainsString "${D}" "${SUBDIR}"; then
SKIP=1
LogText "Result: skipping directory (${SUBDIR}) as it is on ignore list"
fi
done
fi
if [ ${SKIP} -eq 0 ]; then
#Debug "Testing ${FILE} in path: $SUBDIR"
COUNT_DIR=$((COUNT_DIR + 1))
FileIsReadable "${FILE}"
if [ ${CANREAD} -eq 1 ]; then
# Only check the files that are not installed by a package, unless enabled by profile
if [ ${SSL_CERTIFICATE_INCLUDE_PACKAGES} -eq 1 ] || ! FileInstalledByPackage "${FILE}"; then
echo ${FILE} | ${GREPBINARY} -E -q ".cer$|.der$"
CER_DER=$?
OUTPUT=$(${GREPBINARY} -q 'BEGIN CERT' "${FILE}")
if [ $? -eq 0 -o ${CER_DER} -eq 0 ]; then
LogText "Result: file is a certificate file"
if [ ${CER_DER} -eq 0 ]; then
SSL_DER_OPT="-inform der"
else
SSL_DER_OPT=
fi
FIND=$(${OPENSSLBINARY} x509 -noout ${SSL_DER_OPT} -in "${FILE}" -enddate 2> /dev/null | ${GREPBINARY} "^notAfter")
if [ $? -eq 0 ]; then
# Check certificate where 'end date' has been expired
FIND=$(${OPENSSLBINARY} x509 -noout ${SSL_DER_OPT} -checkend 0 -in "${FILE}" -enddate 2> /dev/null)
EXIT_CODE=$?
CERT_CN=$(${OPENSSLBINARY} x509 -noout ${SSL_DER_OPT} -subject -in "${FILE}" 2> /dev/null | ${SEDBINARY} -e 's/^subject.*CN=\([a-zA-Z0-9\.\-\*]*\).*$/\1/')
CERT_NOTAFTER=$(${OPENSSLBINARY} x509 -noout ${SSL_DER_OPT} -enddate -in "${FILE}" 2> /dev/null | ${AWKBINARY} -F= '{if ($1=="notAfter") { print $2 }}')
Report "certificate[]=${FILE}|${EXIT_CODE}|cn:${CERT_CN};notafter:${CERT_NOTAFTER};|"
if [ ${EXIT_CODE} -eq 0 ]; then
LogText "Result: certificate ${FILE} seems to be correct and still valid"
else
FOUNDPROBLEM=1
COUNT_EXPIRED=$((COUNT_EXPIRED + 1))
LogText "Result: certificate ${FILE} has been expired"
fi
else
LogText "Result: skipping tests for this file (${FILE}) as it is most likely not a certificate (is it a key file?)"
fi
else
LogText "Result: skipping test for this file (${FILE}) as we could not find 'BEGIN CERT'"
fi
fi
else
LogText "Result: can not read file ${FILE} (no permission)"
fi
fi
LASTSUBDIR="${SUBDIR}"
done
COUNT_TOTAL=$((COUNT_TOTAL + COUNT_DIR))
LogText "Result: found ${COUNT_DIR} certificates in ${DIR}"
else
LogText "Result: can not read path ${DIR} (no permission)"
fi
else
LogText "Result: SSL path ${DIR} does not exist"
fi
done
Report "certificates=${COUNT_TOTAL}"
LogText "Result: found a total of ${COUNT_TOTAL} certificates"
if [ ${FOUNDPROBLEM} -eq 0 ]; then
Display --indent 2 --text "- Checking for expired SSL certificates [${COUNT_EXPIRED}/${COUNT_TOTAL}]" --result "${STATUS_NONE}" --color GREEN
else
Display --indent 2 --text "- Checking for expired SSL certificates [${COUNT_EXPIRED}/${COUNT_TOTAL}]" --result "${STATUS_FOUND}" --color RED
ReportSuggestion "${TEST_NO}" "Check available certificates for expiration"
fi
fi
#
#################################################################################
#
# Test : CRYP-7930
# Description : Determine if system uses LUKS block device encryption
Register --test-no CRYP-7930 --os Linux --weight L --network NO --root-only YES --category security --description "Determine if system uses LUKS block device encryption"
if [ ${SKIPTEST} -eq 0 ]; then
CRYPTTABFILE="${ROOTDIR}etc/crypttab"
FOUND=0
# cryptsetup only works as root
if [ -n "${LSBLKBINARY}" ] && [ -n "${CRYPTSETUPBINARY}" ] && [ ${FORENSICS_MODE} -eq 0 ]; then
for BLOCK_DEV in $(${LSBLKBINARY} --noheadings --list -o NAME 2> /dev/null | cut -d' ' -f1); do
if ${CRYPTSETUPBINARY} isLuks $(${FINDBINARY} /dev/ -name "${BLOCK_DEV}" 2> /dev/null) 2> /dev/null; then
LogText "Result: Found LUKS encrypted block device: ${BLOCK_DEV}"
Report "encryption[]=luks,block_device,${BLOCK_DEV}"
FOUND=$((FOUND +1))
else
LogText "Result: block device ${BLOCK_DEV} is not LUKS encrypted"
fi
done
unset BLOCK_DEV
# This will enable us to do a test for forensics or when crypsetup/lsblk are not available
elif [ -f ${CRYPTTABFILE} ]; then
LogText "Result: crypttab (${CRYPTTABFILE}) exists"
DATA=$(${GREPBINARY} "^[a-z]" ${CRYPTTABFILE} | ${TRBINARY} -cd '[:alnum:]_\-=,\n\t ' | ${SEDBINARY} 's/[[:blank:]]/__space__/g')
for LINE in ${DATA}; do
LINE=$(echo ${LINE} | ${SEDBINARY} 's/__space__/ /g')
if ContainsString "luks," "${LINE}"; then
PARTITION=$(echo ${LINE} | ${AWKBINARY} '{print $1}' | ${AWKBINARY} -F_ '{print $1}')
LogText "Result: Found LUKS encryption on partition ${PARTITION}"
Report "encryption[]=luks,partition,${PARTITION}"
FOUND=$((FOUND +1))
fi
done
unset DATA LINE PARTITION
fi
if [ ${FOUND} -gt 0 ]; then
Display --indent 2 --text "- Found ${FOUND} LUKS encrypted block devices." --result OK --color WHITE
fi
unset FOUND
fi
#
#################################################################################
#
# Test : CRYP-7931
# Description : Determine if system uses encrypted swap
if [ -e "${SWAPONBINARY}" -a -e "${CRYPTSETUPBINARY}" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no CRYP-7931 --preqs-met ${PREQS_MET} --os Linux --weight L --network NO --root-only YES --category security --description "Determine if system uses encrypted swap"
if [ ${SKIPTEST} -eq 0 ]; then
ENCRYPTED_SWAPS=0
UNENCRYPTED_SWAPS=0
# Redirect errors, as RHEL 5/6 and others don't have the --show option
SWAPS=$(${SWAPONBINARY} --show=NAME --noheadings 2> /dev/null)
if [ $? -eq 0 ]; then
for BLOCK_DEV in ${SWAPS}; do
if ${CRYPTSETUPBINARY} isLuks "${BLOCK_DEV}" 2> /dev/null; then
LogText "Result: Found LUKS encrypted swap device: ${BLOCK_DEV}"
ENCRYPTED_SWAPS=$((ENCRYPTED_SWAPS + 1))
Report "encrypted_swap[]=${BLOCK_DEV},LUKS"
elif ${CRYPTSETUPBINARY} status "${BLOCK_DEV}" 2> /dev/null | ${GREPBINARY} -q "cipher:"; then
LogText "Result: Found non-LUKS encrypted swap device: ${BLOCK_DEV}"
ENCRYPTED_SWAPS=$((ENCRYPTED_SWAPS + 1))
Report "encrypted_swap[]=${BLOCK_DEV},other"
else
LogText "Result: Found unencrypted swap device: ${BLOCK_DEV}"
UNENCRYPTED_SWAPS=$((UNENCRYPTED_SWAPS +1))
Report "non_encrypted_swap[]=${BLOCK_DEV}"
fi
done
Display --indent 2 --text "- Found ${ENCRYPTED_SWAPS} encrypted and ${UNENCRYPTED_SWAPS} unencrypted swap devices in use." --result OK --color WHITE
else
LogText "Result: skipping testing as swapon returned an error."
fi
fi
#
#################################################################################
#
# Test : CRYP-8002
# Description : Gather available kernel entropy
Register --test-no CRYP-8002 --os Linux --weight L --network NO --root-only NO --category security --description "Gather available kernel entropy"
if [ ${SKIPTEST} -eq 0 ]; then
if [ -f ${ROOTDIR}proc/sys/kernel/random/entropy_avail ]; then
DATA=$(${AWKBINARY} '$1 ~ /^[0-9]+$/ {print $1}' ${ROOTDIR}proc/sys/kernel/random/entropy_avail)
if [ -n "${DATA}" ]; then
LogText "Result: found kernel entropy value of ${DATA}"
Report "kernel_entropy=${DATA}"
if [ ${DATA} -gt 200 ]; then
Display --indent 2 --text "- Kernel entropy is sufficient" --result "${STATUS_YES}" --color GREEN
else
Display --indent 2 --text "- Kernel entropy is sufficient" --result "${STATUS_NO}" --color YELLOW
# TODO - enable suggestion when information on website is available
fi
fi
fi
fi
#
#################################################################################
#
# Test : CRYP-8004
# Description : Test for presence of hardware random number generators
Register --test-no CRYP-8004 --os Linux --weight L --network NO --root-only NO --category security --description "Presence of hardware random number generators"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: looking for ${ROOTDIR}sys/class/misc/hw_random/rng_current"
if [ -f "${ROOTDIR}sys/class/misc/hw_random/rng_current" ]; then
DATA=$(${HEADBINARY} -n 1 ${ROOTDIR}sys/class/misc/hw_random/rng_current | ${TRBINARY} -d '[[:cntrl:]]')
if [ "${DATA}" != "none" ]; then
LogText "Result: positive match, found RNG: ${DATA}"
if IsRunning "rngd"; then
Display --indent 2 --text "- HW RNG & rngd" --result "${STATUS_YES}" --color GREEN
LogText "Result: rngd is running"
RNG_FOUND=1
else
Display --indent 2 --text "- HW RNG & rngd" --result "${STATUS_NO}" --color YELLOW
# TODO - enable suggestion when website has listing for this control
# ReportSuggestion "${TEST_NO}" "Utilize hardware random number generation by running rngd"
fi
else
Display --indent 2 --text "- HW RNG & rngd" --result "${STATUS_NO}" --color YELLOW
LogText "Result: no HW RNG available"
fi
else
Display --indent 2 --text "- HW RNG & rngd" --result "${STATUS_NO}" --color RED
LogText "Result: could not find ${ROOTDIR}sys/class/misc/hw_random/rng_current"
fi
fi
#
#################################################################################
#
# Test : CRYP-8005
# Description : Test for presence of software pseudo random number generators
Register --test-no CRYP-8005 --os Linux --weight L --network NO --root-only NO --category security --description "Presence of software pseudo random number generators"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: looking for software pseudo random number generators"
FOUND=""
for SERVICE in audio-entropyd haveged jitterentropy-rngd; do
# Using --full as jitterentropy-rngd would otherwise not match
if IsRunning --full "${SERVICE}"; then
FOUND="${FOUND} ${SERVICE}"
fi
done
if [ -z "${FOUND}" ]; then
Display --indent 2 --text "- SW prng" --result "${STATUS_NO}" --color YELLOW
# ReportSuggestion "${TEST_NO}" "Utilize software pseudo random number generators"
else
RNG_FOUND=1
Display --indent 2 --text "- SW prng" --result "${STATUS_YES}" --color GREEN
LogText "Result: found ${FOUND} running"
fi
fi
#
#################################################################################
#
# Test : CRYP-8006
# Description : Check that the MemoryOverwriteRequest-bit is set to protect against cold-boot attacks
Register --test-no CRYP-8006 --os Linux --weight L --network NO --root-only NO --category security --description "MemoryOverwriteRequest-bit set"
if [ ${SKIPTEST} -eq 0 ]; then
MOR_CONTROL="${ROOTDIR}sys/firmware/efi/efivars/MemoryOverwriteRequestControl-e20939be-32d4-41be-a150-897f85d49829"
LogText "Test: looking for ${MOR_CONTROL}"
if [ -f "${MOR_CONTROL}" ]; then
DATA=$(od -An --skip-bytes=4 "$MOR_CONTROL")
if [ "$DATA" = " 000001" ]; then
LogText "Result: MOR-bit set"
Display --indent 2 --text "MOR-bit set" --result "${STATUS_YES}" --color GREEN
elif [ "$DATA" = " 000000" ]; then
LogText "Result: MOR-bit not set!"
Display --indent 2 --text "MOR-bit set" --result "${STATUS_NO}" --color RED
else
LogText "Result: MOR-bit unknown. Found: $DATA"
Display --indent 2 --text "MOR-bit set" --result "${STATUS_UNKNOWN}" --color YELLOW
fi
else
LogText "Result: could not find ${MOR_CONTROL}"
Display --indent 2 --text "- MOR variable not found" --result "${STATUS_WEAK}" --color WHITE
fi
fi
#
#################################################################################
#
Report "rng_found=${RNG_FOUND}"
#
#################################################################################
#
WaitForKeyPress
#
#================================================================================
# Lynis - Security Auditing and System Hardening for Linux and UNIX - https://cisofy.com