mirror of
https://github.com/CISOfy/lynis.git
synced 2026-03-11 08:55:28 +00:00
9642bcffc8
The package maintainers are not immune to mistakes or they might not always provide timely updates, so let's check (optionally) more certificates even if they are delivered by packages. I found three expired certificates in my Debian/unstable system, thanks to changed Lynis. Signed-off-by: Topi Miettinen <toiwoton@gmail.com>
255 lines
14 KiB
Bash
255 lines
14 KiB
Bash
#!/bin/sh
|
|
|
|
#################################################################################
|
|
#
|
|
# Lynis
|
|
# ------------------
|
|
#
|
|
# Copyright 2007-2013, Michael Boelen
|
|
# Copyright 2007-2020, 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
|
|
#
|
|
#################################################################################
|
|
#
|
|
InsertSection "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 | ${EGREPBINARY} ".crt$|.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 ${SSL_CERTIFICATE_PATHS_TO_IGNORE}; do
|
|
if Equals "${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
|
|
OUTPUT=$(${GREPBINARY} -q 'BEGIN CERT' "${FILE}")
|
|
if [ $? -eq 0 ]; then
|
|
LogText "Result: file is a certificate file"
|
|
FIND=$(${OPENSSLBINARY} x509 -noout -in "${FILE}" -enddate 2> /dev/null | ${GREPBINARY} "^notAfter")
|
|
if [ $? -eq 0 ]; then
|
|
# Check certificate where 'end date' has been expired
|
|
FIND=$(${OPENSSLBINARY} x509 -noout -checkend 0 -in "${FILE}" -enddate 2> /dev/null)
|
|
EXIT_CODE=$?
|
|
CERT_CN=$(${OPENSSLBINARY} x509 -noout -subject -in "${FILE}" 2> /dev/null | ${SEDBINARY} -e 's/^subject.*CN=\([a-zA-Z0-9\.\-\*]*\).*$/\1/')
|
|
CERT_NOTAFTER=$(${OPENSSLBINARY} x509 -noout -enddate -in "${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-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} --lines=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"
|
|
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
|
|
Display --indent 2 --text "- SW prng" --result "${STATUS_YES}" --color GREEN
|
|
LogText "Result: found ${FOUND} running"
|
|
fi
|
|
fi
|
|
#
|
|
#################################################################################
|
|
#
|
|
|
|
WaitForKeyPress
|
|
|
|
#
|
|
#================================================================================
|
|
# Lynis - Security Auditing and System Hardening for Linux and UNIX - https://cisofy.com
|