mirror of https://github.com/CISOfy/lynis.git
121 lines
5.6 KiB
Bash
121 lines
5.6 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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# Kernel
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#
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#################################################################################
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#
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InsertSection "${SECTION_KERNEL_HARDENING}"
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#
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#################################################################################
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#
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# Test : KRNL-6000
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# Description : Check sysctl parameters
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# Sysctl : net.ipv4.icmp_ignore_bogus_error_responses (=1)
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if [ ! "${SYSCTL_READKEY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
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Register --test-no KRNL-6000 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check sysctl key pairs in scan profile"
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if [ ${SKIPTEST} -eq 0 ]; then
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FOUND=0
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DATA_TO_SCAN=""
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N=0
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Display --indent 2 --text "- Comparing sysctl key pairs with scan profile"
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# First scan optional profiles only (ignore default and custom)
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for PROFILE in ${PROFILES}; do
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FILE=$(echo ${PROFILE} | ${AWKBINARY} -F/ '{print $NF}')
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if [ ! "${FILE}" = "default.prf" -a ! "${FILE}" = "custom.prf" ]; then
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FIND=$(${GREPBINARY} "^config-data=sysctl;" ${PROFILE} | ${SEDBINARY} 's/ /-space-/g')
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DATA_TO_SCAN="${DATA_TO_SCAN} ${FIND}"
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fi
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done
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# Scan custom profile
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if [ -n "${CUSTOM_PROFILE}" ]; then
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FIND=$(${GREPBINARY} "^config-data=sysctl;" ${CUSTOM_PROFILE} | ${SEDBINARY} 's/ /-space-/g')
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for LINE in ${FIND}; do
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SYSCTLKEY=$(echo ${LINE} | ${AWKBINARY} -F\; '{ print $2 }')
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HAS_KEY=$(echo ${DATA_TO_SCAN} | ${GREPBINARY} ";${SYSCTLKEY};")
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if [ $? -gt 0 ]; then DATA_TO_SCAN="${DATA_TO_SCAN} ${LINE}"; fi
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done
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fi
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# Last, use data from default profile
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if [ -n "${DEFAULT_PROFILE}" ]; then
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FIND=$(${GREPBINARY} "^config-data=sysctl;" ${DEFAULT_PROFILE} | ${SEDBINARY} 's/ /-space-/g')
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for LINE in ${FIND}; do
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SYSCTLKEY=$(echo ${LINE} | ${AWKBINARY} -F\; '{ print $2 }')
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HAS_KEY=$(echo ${DATA_TO_SCAN} | ${GREPBINARY} ";${SYSCTLKEY};")
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if [ $? -gt 0 ]; then DATA_TO_SCAN="${DATA_TO_SCAN} ${LINE}"; fi
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done
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fi
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# Sort the results
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DATA_TO_SCAN=$(echo ${DATA_TO_SCAN} | ${TRBINARY} ' ' '\n' | sort)
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for line in ${DATA_TO_SCAN}; do
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tFINDkey=$(echo ${line} | ${AWKBINARY} -F\; '{ print $2 }')
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if ! SkipAtomicTest "${TEST_NO}:${tFINDkey}"; then
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tFINDexpvalue=$(echo ${line} | ${AWKBINARY} -F\; '{ print $3 }' | ${TRBINARY} '|' ' ')
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tFINDhp=$(echo ${line} | ${AWKBINARY} -F\; '{ print $4 }' | ${GREPBINARY} "[0-9]")
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tFINDdesc=$(echo ${line} | ${AWKBINARY} -F\; '{ print $5 }' | ${SEDBINARY} 's/-space-/ /g')
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tFINDcurvalue=$(${SYSCTL_READKEY} ${tFINDkey} 2> /dev/null)
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if [ -n "${tFINDcurvalue}" ]; then
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positive_match=0
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for value in ${tFINDexpvalue}; do
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if [ "${value}" = "${tFINDcurvalue}" ]; then
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positive_match=1
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fi
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done
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if [ ${positive_match} -eq 1 ]; then
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LogText "Result: sysctl key ${tFINDkey} contains equal expected and current value (${tFINDexpvalue})"
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Display --indent 4 --text "- ${tFINDkey} (exp: ${tFINDexpvalue})" --result "${STATUS_OK}" --color GREEN
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AddHP ${tFINDhp} ${tFINDhp}
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else
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LogText "Result: sysctl key ${tFINDkey} has a different value than expected in scan profile. Expected=${tFINDexpvalue}, Real=${tFINDcurvalue}"
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Display --indent 4 --text "- ${tFINDkey} (exp: ${tFINDexpvalue})" --result "${STATUS_DIFFERENT}" --color RED
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AddHP 0 ${tFINDhp}
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FOUND=1
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N=$((N + 1))
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ReportDetails --test "${TEST_NO}" --service "sysctl" --field "${tFINDkey}" --value "${tFINDcurvalue}" --preferredvalue "${tFINDexpvalue}" --description "${tFINDdesc}"
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fi
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else
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LogText "Result: key ${tFINDkey} does not exist on this machine"
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fi
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else
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LogText "Skipped test for ${tFINDkey} via profile"
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fi
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done
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# Add suggestion if one or more sysctls have a different value than scan profile
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if [ ${FOUND} -eq 1 ]; then
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LogText "Result: found ${N} keys that can use tuning, according scan profile"
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ReportSuggestion "${TEST_NO}" "One or more sysctl values differ from the scan profile and could be tweaked" "" "Change sysctl value or disable test (skip-test=${TEST_NO}:<sysctl-key>)"
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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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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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