#!/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.
#
#################################################################################
#
# Banners and identification
#
#################################################################################
#
    InsertSection "${SECTION_BANNERS_AND_IDENTIFICATION}"
#
#################################################################################
#
    BANNER_FILES="${ROOTDIR}etc/issue ${ROOTDIR}etc/issue.net ${ROOTDIR}etc/motd"
    LEGAL_BANNER_STRINGS="audit access authori condition connect consent continu criminal enforce evidence forbidden intrusion law legal legislat log monitor owner penal policy policies privacy private prohibited prosecute record report restricted secure subject system terms warning"
#
#################################################################################
#
    # Test        : BANN-7113
    # Description : Check FreeBSD COPYRIGHT banner file
    Register --test-no BANN-7113 --os FreeBSD --weight L --network NO --category security --description "Check COPYRIGHT banner file"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Testing existence ${ROOTDIR}COPYRIGHT or ${ROOTDIR}etc/COPYRIGHT"
        if [ -f ${ROOTDIR}COPYRIGHT ]; then
            Display --indent 2 --text "- ${ROOTDIR}COPYRIGHT" --result "${STATUS_FOUND}" --color GREEN
            if [ -s ${ROOTDIR}COPYRIGHT ]; then
                LogText "Result: ${ROOTDIR}COPYRIGHT available and contains text"
            else
                LogText "Result: ${ROOTDIR}COPYRIGHT available, but empty"
            fi
        else
            Display --indent 2 --text "- ${ROOTDIR}COPYRIGHT" --result "${STATUS_NOT_FOUND}" --color WHITE
            LogText "Result: ${ROOTDIR}COPYRIGHT not found"
        fi

        if [ -f ${ROOTDIR}etc/COPYRIGHT ]; then
            Display --indent 2 --text "- ${ROOTDIR}etc/COPYRIGHT" --result "${STATUS_FOUND}" --color GREEN
            if [ -s ${ROOTDIR}etc/COPYRIGHT ]; then
                LogText "Result: ${ROOTDIR}etc/COPYRIGHT available and contains text"
            else
                LogText "Result: ${ROOTDIR}etc/COPYRIGHT available, but empty"
            fi
        else
            Display --indent 2 --text "- ${ROOTDIR}etc/COPYRIGHT" --result "${STATUS_NOT_FOUND}" --color WHITE
            LogText "Result: ${ROOTDIR}etc/COPYRIGHT not found"
        fi
    fi
#
#################################################################################
#
    # Test        : BANN-7124
    # Description : Check issue banner file
    Register --test-no BANN-7124 --weight L --network NO --category security --description "Check issue banner file"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Checking file ${ROOTDIR}etc/issue"
        if [ -f ${ROOTDIR}etc/issue ]; then
            # Check for symlink
            if [ -L ${ROOTDIR}etc/issue ]; then
                LogText "Result: file ${ROOTDIR}etc/issue exists (symlink)"
                Display --indent 2 --text "- ${ROOTDIR}etc/issue" --result SYMLINK --color GREEN
            else
                Display --indent 2 --text "- ${ROOTDIR}etc/issue" --result "${STATUS_FOUND}" --color GREEN
            fi
        else
            LogText "Result: file ${ROOTDIR}etc/issue does not exist"
            Display --indent 2 --text "- ${ROOTDIR}etc/issue" --result "${STATUS_NOT_FOUND}" --color WHITE
        fi
    fi
#
#################################################################################
#
    # Test        : BANN-7126
    # Description : Check issue file to see if it contains some form of message
    #               to discourage unauthorized users to leave the system alone
    if [ -f ${ROOTDIR}etc/issue ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no BANN-7126 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check issue banner file contents"
    if [ ${SKIPTEST} -eq 0 ]; then
        COUNT=0
        FILE="${ROOTDIR}etc/issue"
        LogText "Test: Checking file ${FILE} contents for legal key words"
        for ITEM in ${LEGAL_BANNER_STRINGS}; do
            FIND=$(${GREPBINARY} -i "${ITEM}" ${FILE})
            if HasData "${FIND}"; then
                LogText "Result: found string '${ITEM}'"
                COUNT=$((COUNT + 1))
            fi
        done
        # Check if we have 5 or more key words
        if [ ${COUNT} -gt 4 ]; then
            LogText "Result: Found ${COUNT} key words (5 or more suggested), to warn unauthorized users"
            Display --indent 4 --text "- ${FILE} contents" --result "${STATUS_OK}" --color GREEN
            AddHP 2 2
        else
            LogText "Result: Found only ${COUNT} key words (5 or more suggested), to warn unauthorized users and could be increased"
            Display --indent 4 --text "- ${FILE} contents" --result "${STATUS_WEAK}" --color YELLOW
            ReportSuggestion "${TEST_NO}" "Add a legal banner to ${FILE}, to warn unauthorized users"
            AddHP 0 1
            Report "weak_banner_file[]=${FILE}"
        fi
    fi
#
#################################################################################
#
    # Test        : BANN-7128
    # Description : Check issue.net banner file
    Register --test-no BANN-7128 --weight L --network NO --category security --description "Check issue.net banner file"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Checking file ${ROOTDIR}etc/issue.net"
        if [ -f ${ROOTDIR}etc/issue.net ]; then
            # Check for symlink
            if [ -L ${ROOTDIR}etc/issue.net ]; then
                LogText "Result: file ${ROOTDIR}etc/issue.net exists (symlink)"
                Display --indent 2 --text "- ${ROOTDIR}etc/issue.net" --result SYMLINK --color GREEN
            else
                LogText "Result: file ${ROOTDIR}etc/issue.net exists"
                Display --indent 2 --text "- ${ROOTDIR}etc/issue.net" --result "${STATUS_FOUND}" --color GREEN
            fi
        else
            LogText "Result: file ${ROOTDIR}etc/issue.net does not exist"
            Display --indent 2 --text "- ${ROOTDIR}etc/issue.net" --result "${STATUS_NOT_FOUND}" --color WHITE
        fi
    fi
#
#################################################################################
#
    # Test        : BANN-7130
    # Description : Check issue.net file to see if it contains some form of message
    #               to discourage unauthorized users to leave the system alone
    if [ -f ${ROOTDIR}etc/issue.net ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no BANN-7130 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check issue.net banner file contents"
    if [ ${SKIPTEST} -eq 0 ]; then
        COUNT=0
        LogText "Test: Checking file ${ROOTDIR}etc/issue.net contents for legal key words"
        for ITEM in ${LEGAL_BANNER_STRINGS}; do
            FIND=$(${GREPBINARY} -i "${ITEM}" ${ROOTDIR}etc/issue.net)
            if HasData "${FIND}"; then
                LogText "Result: found string '${ITEM}'"
                COUNT=$((COUNT + 1))
            fi
        done
        # Check if we have 5 or more key words
        if [ ${COUNT} -gt 4 ]; then
            LogText "Result: Found ${COUNT} key words, to warn unauthorized users"
            Display --indent 4 --text "- ${ROOTDIR}etc/issue.net contents" --result "${STATUS_OK}" --color GREEN
            AddHP 2 2
        else
            LogText "Result: Found only ${COUNT} key words, to warn unauthorized users and could be increased"
            Display --indent 4 --text "- ${ROOTDIR}etc/issue.net contents" --result "${STATUS_WEAK}" --color YELLOW
            ReportSuggestion "${TEST_NO}" "Add legal banner to /etc/issue.net, to warn unauthorized users"
            AddHP 0 1
        fi
    fi
#
#################################################################################
#

WaitForKeyPress

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