#!/bin/sh

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#
#   Lynis
# ------------------
#
# Copyright 2007-2013, Michael Boelen
# Copyright 2013-2016, 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.
#
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#
# Kernel
#
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#
    InsertSection "Kernel Hardening"
#
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#
    # Test        : KRNL-6000
    # Description : Check sysctl parameters
    # Sysctl      : net.ipv4.icmp_ingore_bogus_error_responses (=1)
    if [ ! "${SYSCTL_READKEY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no KRNL-6000 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check sysctl key pairs in scan profile"
    if [ ${SKIPTEST} -eq 0 ]; then
        FOUND=0
        N=0
        Display --indent 2 --text "- Comparing sysctl key pairs with scan profile"
        for PROFILE in ${PROFILES}; do
            FIND=`grep "^sysctl:" ${PROFILE} | sed 's/ /-space-/g'`
            for I in ${FIND}; do
                tFINDkey=`echo ${I} | awk -F: '{ print $2 }'`
                tFINDexpvalue=`echo ${I} | awk -F: '{ print $3 }'`
                tFINDhp=`echo ${I} | awk -F: '{ print $4 }' | grep "[0-9]"`
                tFINDdesc=`echo ${I} | awk -F: '{ print $5 }' | sed 's/-space-/ /g'`
                tFINDcurvalue=`${SYSCTL_READKEY} ${tFINDkey} 2> /dev/null`
                if [ ! "${tFINDcurvalue}" = "" ]; then
                    if [ "${tFINDexpvalue}" = "${tFINDcurvalue}" ]; then
                        LogText "Result: sysctl key ${tFINDkey} contains equal expected and current value (${tFINDexpvalue})"
                        Display --indent 4 --text "- ${tFINDkey} (exp: ${tFINDexpvalue})" --result "${STATUS_OK}" --color GREEN
                        AddHP ${tFINDhp} ${tFINDhp}
                      else
                        LogText "Result: sysctl key ${tFINDkey} has a different value than expected in scan profile. Expected=${tFINDexpvalue}, Real=${tFINDcurvalue}"
                        Display --indent 4 --text "- ${tFINDkey} (exp: ${tFINDexpvalue})" --result DIFFERENT --color RED
                        AddHP 0 ${tFINDhp}
                        FOUND=1
                        N=$((N + 1))
                        ReportDetails --test "${TEST_NO}" --service "sysctl" --field "${tFINDkey}" --value "${tFINDcurvalue}" --preferredvalue "${tFINDexpvalue}" --description "${tFINDdesc}"
                    fi
                  else
                    LogText "Result: key ${tFINDkey} does not exist on this machine"
                fi
            done
        done

        # Add suggestion if one or more sysctls have a different value than scan profile
        if [ ${FOUND} -eq 1 ]; then
            LogText "Result: found ${N} keys that can use tuning, according scan profile"
            ReportSuggestion ${TEST_NO} "One or more sysctl values differ from the scan profile and could be tweaked"
        fi
    fi
#
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#

WaitForKeyPress

#
#================================================================================
# Lynis - Security Auditing and System Hardening for Linux and UNIX - https://cisofy.com