mirror of https://github.com/CISOfy/lynis.git
181 lines
9.5 KiB
Bash
181 lines
9.5 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 2007-2019, 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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# Cryptography
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#
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#################################################################################
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#
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InsertSection "Cryptography"
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#
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#################################################################################
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#
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# Test : CRYP-7902
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# Description : check for expired SSL certificates
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if [ -n "${OPENSSLBINARY}" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
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Register --test-no CRYP-7902 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check expire date of SSL certificates"
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if [ ${SKIPTEST} -eq 0 ]; then
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COUNT_EXPIRED=0
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COUNT_TOTAL=0
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FOUNDPROBLEM=0
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SKIP=0
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sSSL_PATHS=$(echo ${SSL_CERTIFICATE_PATHS} | ${SEDBINARY} 's/:space:/__space__/g' | ${SEDBINARY} 's/:/ /g')
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sSSL_PATHS=$(echo ${sSSL_PATHS} | ${SEDBINARY} 's/^ //' | ${SORTBINARY} -u)
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LogText "Paths to scan: ${sSSL_PATHS}"
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IGNORE_PATHS_PRINT=$(echo ${SSL_CERTIFICATE_PATHS_TO_IGNORE} | ${SEDBINARY} 's/:/, /g' | ${SEDBINARY} 's/__space__/ /g' | ${SEDBINARY} 's/^ //' | ${SORTBINARY} -u)
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LogText "Paths to ignore: ${IGNORE_PATHS_PRINT}"
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for DIR in ${sSSL_PATHS}; do
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COUNT_DIR=0
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if [ -d ${DIR} ]; then
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FileIsReadable ${DIR}
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if [ ${CANREAD} -eq 1 ]; then
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LASTSUBDIR=""
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LogText "Result: found directory ${DIR}"
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# Search for certificate files
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FILES=$(${FINDBINARY} ${DIR} -type f 2> /dev/null | ${EGREPBINARY} ".crt$|.pem$|^cert" | ${SORTBINARY} | ${SEDBINARY} 's/ /__space__/g')
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for FILE in ${FILES}; do
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FILE=$(echo ${FILE} | ${SEDBINARY} 's/__space__/ /g')
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# See if we need to skip this path
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SUBDIR=$(echo ${FILE} | ${AWKBINARY} -F/ 'sub(FS $NF,x)' | ${SEDBINARY} 's/__space__/ /g')
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# If we discover a new directory, do evaluation
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#Debug "File : ${FILE}"
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#Debug "Lastdir: ${LASTSUBDIR}"
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#Debug "Curdir : ${SUBDIR}"
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if [ ! "${SUBDIR}" = "${LASTSUBDIR}" ]; then
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SKIP=0
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# Now check if this path is on the to-be-ignored list
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for D in ${SSL_CERTIFICATE_PATHS_TO_IGNORE}; do
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if Equals "${D}" "${SUBDIR}"; then
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SKIP=1
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LogText "Result: skipping directory (${SUBDIR}) as it is on ignore list"
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fi
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done
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fi
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if [ ${SKIP} -eq 0 ]; then
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#Debug "Testing ${FILE} in path: $SUBDIR"
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COUNT_DIR=$((COUNT_DIR + 1))
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FileIsReadable "${FILE}"
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if [ ${CANREAD} -eq 1 ]; then
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# Only check the files that are not installed by a package
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if ! FileInstalledByPackage "${FILE}"; then
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OUTPUT=$(${GREPBINARY} -q 'BEGIN CERT' "${FILE}")
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if [ $? -eq 0 ]; then
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LogText "Result: file is a certificate file"
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FIND=$(${OPENSSLBINARY} x509 -noout -in "${FILE}" -enddate 2> /dev/null | ${GREPBINARY} "^notAfter")
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if [ $? -eq 0 ]; then
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# Check certificate where 'end date' has been expired
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FIND=$(${OPENSSLBINARY} x509 -noout -checkend 0 -in "${FILE}" -enddate 2> /dev/null)
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EXIT_CODE=$?
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CERT_CN=$(${OPENSSLBINARY} x509 -noout -subject -in "${FILE}" 2> /dev/null | ${SEDBINARY} -e 's/^subject.*CN=\([a-zA-Z0-9\.\-\*]*\).*$/\1/')
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CERT_NOTAFTER=$(${OPENSSLBINARY} x509 -noout -enddate -in "${FILE}" 2> /dev/null | ${AWKBINARY} -F= '{if ($1=="notAfter") { print $2 }}')
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Report "certificate[]=${FILE}|${EXIT_CODE}|cn:${CERT_CN};notafter:${CERT_NOTAFTER};|"
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if [ ${EXIT_CODE} -eq 0 ]; then
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LogText "Result: certificate ${FILE} seems to be correct and still valid"
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else
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FOUNDPROBLEM=1
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COUNT_EXPIRED=$((COUNT_EXPIRED + 1))
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LogText "Result: certificate ${FILE} has been expired"
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fi
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else
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LogText "Result: skipping tests for this file (${FILE}) as it is most likely not a certificate (is it a key file?)"
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fi
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else
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LogText "Result: skipping test for this file (${FILE}) as we could not find 'BEGIN CERT'"
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fi
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fi
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else
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LogText "Result: can not read file ${FILE} (no permission)"
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fi
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fi
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LASTSUBDIR="${SUBDIR}"
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done
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COUNT_TOTAL=$((COUNT_TOTAL + COUNT_DIR))
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LogText "Result: found ${COUNT_DIR} certificates in ${DIR}"
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else
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LogText "Result: can not read path ${DIR} (no permission)"
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fi
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else
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LogText "Result: SSL path ${DIR} does not exist"
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fi
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done
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Report "certificates=${COUNT_TOTAL}"
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LogText "Result: found a total of ${COUNT_TOTAL} certificates"
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if [ ${FOUNDPROBLEM} -eq 0 ]; then
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Display --indent 2 --text "- Checking for expired SSL certificates [${COUNT_EXPIRED}/${COUNT_TOTAL}]" --result "${STATUS_NONE}" --color GREEN
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else
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Display --indent 2 --text "- Checking for expired SSL certificates [${COUNT_EXPIRED}/${COUNT_TOTAL}]" --result "${STATUS_FOUND}" --color RED
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ReportSuggestion ${TEST_NO} "Check available certificates for expiration"
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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 : CRYP-7930
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# Description : Determine if system uses LUKS block device encryption
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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"
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if [ ${SKIPTEST} -eq 0 ]; then
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CRYPTTABFILE="${ROOTDIR}etc/crypttab"
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FOUND=0
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# cryptsetup only works as root
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if [ -n "${LSBLKBINARY}" -a -n "${CRYPTSETUPBINARY}" -a ${FORENSICS_MODE} -eq 0 ]; then
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for BLOCK_DEV in $(${LSBLKBINARY} --noheadings -o PATH); do
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if ${CRYPTSETUPBINARY} isLuks ${BLOCK_DEV}; then
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LogText "Result: Found LUKS encrypted block device: ${BLOCK_DEV}"
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Report "encryption[]=luks,block_device,${BLOCK_DEV}"
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FOUND=$((FOUND +1))
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else
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LogText "Result: block device ${BLOCK_DEV} is not LUKS encrypted"
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fi
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done
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unset BLOCK_DEV
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# This will enable us to do a test for forensics or when crypsetup/lsblk are not available
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elif [ -f ${CRYPTTABFILE} ]; then
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LogText "Result: crypttab (${CRYPTTABFILE}) exists"
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DATA=$(${GREPBINARY} "^[a-z]" ${CRYPTTABFILE} | ${TRBINARY} -cd '[:alnum:]_\-=,\n\t ' | ${SEDBINARY} 's/[[:blank:]]/__space__/g')
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for LINE in ${DATA}; do
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LINE=$(echo ${LINE} | ${SEDBINARY} 's/__space__/ /g')
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if ContainsString "luks," "${LINE}"; then
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PARTITION=$(echo ${LINE} | ${AWKBINARY} '{print $1}' | ${AWKBINARY} -F_ '{print $1}')
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LogText "Result: Found LUKS encryption on partition ${PARTITION}"
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Report "encryption[]=luks,partition,${PARTITION}"
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FOUND=$((FOUND +1))
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fi
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done
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unset DATA LINE PARTITION
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fi
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if [ ${FOUND} -gt 0 ]; then
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Display --indent 2 --text "- Found ${FOUND} LUKS encrypted block devices." --result OK --color WHITE
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fi
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unset FOUND
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fi
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#
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#################################################################################
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WaitForKeyPress
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#
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#================================================================================
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# Lynis - Security Auditing and System Hardening for Linux and UNIX - https://cisofy.com
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