#!/bin/sh

#################################################################################
#
#   Lynis
# ------------------
#
# Copyright 2007-2015, Michael Boelen, CISOfy (michael.boelen@cisofy.com)
# Web site: https://cisofy.com
#
# 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 "Banners and identification"
#
#################################################################################
#
    BANNER_FILES="/etc/issue /etc/issue.net /etc/motd"
    LEGAL_BANNER_STRINGS="audit access authori intrusion law legal monitor owner policy policies private prohibited restricted subject terms this unauthorized"
#
#################################################################################
#
    # Test        : BANN-7113
    # Description : Check FreeBSD COPYRIGHT banner file
    Register --test-no BANN-7113 --os FreeBSD --weight L --network NO --description "Check COPYRIGHT banner file"
    if [ ${SKIPTEST} -eq 0 ]; then
        logtext "Test: Testing existence /COPYRIGHT or /etc/COPYRIGHT"
        if [ -f /COPYRIGHT ]; then
            Display --indent 2 --text "- /COPYRIGHT" --result FOUND --color GREEN
            if [ -s /COPYRIGHT ]; then
                logtext "Result: /COPYRIGHT available and contains text"
             else
                logtext "Result: /COPYRIGHT available, but empty"
            fi
          else
            Display --indent 2 --text "- /COPYRIGHT" --result "NOT FOUND" --color WHITE
            logtext "Result: /COPYRIGHT not found"
        fi

        if [ -f /etc/COPYRIGHT ]; then
            Display --indent 2 --text "- /etc/COPYRIGHT" --result FOUND --color GREEN
            if [ -s /etc/COPYRIGHT ]; then
                logtext "Result: /etc/COPYRIGHT available and contains text"
              else
                logtext "Result: /etc/COPYRIGHT available, but empty"
            fi
          else
            Display --indent 2 --text "- /etc/COPYRIGHT" --result "NOT FOUND" --color WHITE
            logtext "Result: /etc/COPYRIGHT not found"
        fi
    fi
#
#################################################################################
#
    # Test        : BANN-7119
    # Description : Check MOTD banner file
    Register --test-no BANN-7119 --weight L --network NO --description "Check MOTD banner file"
    if [ ${SKIPTEST} -eq 0 ]; then
        logtext "Test: Testing existence /etc/motd"
        if [ -f /etc/motd  ]; then
            logtext "Result: file /etc/motd exists"
            Display --indent 2 --text "- /etc/motd" --result FOUND --color GREEN
            if [ ! -L /etc/motd ]; then
                IsWorldWritable /etc/motd
                if [ $? -eq 1 ]; then
                    Display --indent 4 --text "- /etc/motd permissions" --result WARNING --color RED
                    logtext "Result: /etc/motd is world writable. Users can change this file!"
                    ReportWarning ${TEST_NO} "H" "/etc/motd is world writable"
                 else
                    Display --indent 4 --text "- /etc/motd permissions" --result OK --color GREEN
                    logtext "Result: /etc/motd is not world writable."
                fi
              else
                logtext "Result: file /etc/motd is symlink"
            fi
          else
            logtext "Result: File /etc/motd not found"
            Display --indent 2 --text "- /etc/motd" --result "NOT FOUND" --color WHITE
        fi
    fi
#
#################################################################################
#
    # Test        : BANN-7122
    # Description : Check motd file to see if it contains some form of message
    #               to discourage unauthorized users to leave the system alone
    if [ -f /etc/motd -a ! -L /etc/motd ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no BANN-7122 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check /etc/motd banner file contents"
    if [ ${SKIPTEST} -eq 0 ]; then
        N=0
        logtext "Test: Checking file /etc/motd contents for legal key words"
        for I in ${LEGAL_BANNER_STRINGS}; do
            FIND=`grep -i "${I}" /etc/motd`
            if [ ! "${FIND}" = "" ]; then
                logtext "Result: found string '${I}'"
                N=`expr ${N} + 1`
            fi
        done
        # Check if we have 5 or more key words
        if [ ${N} -gt 4 ]; then
            logtext "Result: Found ${N} key words, to warn unauthorized users"
            Display --indent 4 --text "- /etc/motd contents" --result OK --color GREEN
            AddHP 2 2
          else
            logtext "Result: Found only ${N} key words, to warn unauthorized users and could be increased"
            Display --indent 4 --text "- /etc/motd contents" --result WEAK --color YELLOW
            ReportSuggestion ${TEST_NO} "Add legal banner to /etc/motd, to warn unauthorized users"
            AddHP 0 1
        fi
    fi
#
#################################################################################
#
    # Test        : BANN-7124
    # Description : Check issue banner file
    Register --test-no BANN-7124 --weight L --network NO --description "Check issue banner file"
    if [ ${SKIPTEST} -eq 0 ]; then
        logtext "Test: Checking file /etc/issue"
        if [ -f /etc/issue ]; then
            # Check for symlink
            if [ -L /etc/issue ]; then
                logtext "Result: file /etc/issue exists (symlink)"
                Display --indent 2 --text "- /etc/issue" --result SYMLINK --color GREEN
              else
                Display --indent 2 --text "- /etc/issue" --result FOUND --color GREEN
            fi
          else
            logtext "Result: file /etc/issue does not exist"
            Display --indent 2 --text "- /etc/issue" --result "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 /etc/issue ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no BANN-7126 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check issue banner file contents"
    if [ ${SKIPTEST} -eq 0 ]; then
        N=0
        logtext "Test: Checking file /etc/issue contents for legal key words"
        for I in ${LEGAL_BANNER_STRINGS}; do
            FIND=`grep -i "${I}" /etc/issue`
            if [ ! "${FIND}" = "" ]; then
                logtext "Result: found string '${I}'"
                N=`expr ${N} + 1`
            fi
        done
        # Check if we have 5 or more key words
        if [ ${N} -gt 4 ]; then
            logtext "Result: Found ${N} key words (5 or more suggested), to warn unauthorized users"
            Display --indent 4 --text "- /etc/issue contents" --result OK --color GREEN
            AddHP 2 2
          else
            logtext "Result: Found only ${N} key words (5 or more suggested), to warn unauthorized users and could be increased"
            Display --indent 4 --text "- /etc/issue contents" --result WEAK --color YELLOW
            ReportSuggestion ${TEST_NO} "Add a legal banner to /etc/issue, to warn unauthorized users"
            AddHP 0 1
        fi
    fi
#
#################################################################################
#
    # Test        : BANN-7128
    # Description : Check issue.net banner file
    Register --test-no BANN-7128 --weight L --network NO --description "Check issue.net banner file"
    if [ ${SKIPTEST} -eq 0 ]; then
        logtext "Test: Checking file /etc/issue.net"
        if [ -f /etc/issue.net ]; then
            # Check for symlink
            if [ -L /etc/issue.net ]; then
                logtext "Result: file /etc/issue.net exists (symlink)"
                Display --indent 2 --text "- /etc/issue.net" --result SYMLINK --color GREEN
              else
                logtext "Result: file /etc/issue.net exists"
                Display --indent 2 --text "- /etc/issue.net" --result FOUND --color GREEN
            fi
          else
            logtext "Result: file /etc/issue.net does not exist"
            Display --indent 2 --text "- /etc/issue.net" --result "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 /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 --description "Check issue.net banner file contents"
    if [ ${SKIPTEST} -eq 0 ]; then
        N=0
        logtext "Test: Checking file /etc/issue.net contents for legal key words"
        for I in ${LEGAL_BANNER_STRINGS}; do
            FIND=`grep -i "${I}" /etc/issue.net`
            if [ ! "${FIND}" = "" ]; then
                logtext "Result: found string '${I}'"
                N=`expr ${N} + 1`
            fi
        done
        # Check if we have 5 or more key words
        if [ ${N} -gt 4 ]; then
            logtext "Result: Found ${N} key words, to warn unauthorized users"
            Display --indent 4 --text "- /etc/issue.net contents" --result OK --color GREEN
            AddHP 2 2
          else
            logtext "Result: Found only ${N} key words, to warn unauthorized users and could be increased"
            Display --indent 4 --text "- /etc/issue.net contents" --result WEAK --color YELLOW
            ReportSuggestion ${TEST_NO} "Add legal banner to /etc/issue.net, to warn unauthorized users"
            AddHP 0 1
        fi
    fi
#
#################################################################################
#
# /etc/dt/config/*/Xresources
# /etc/default/telnetd (telnet without TCP wrappers)
# /etc/default/ftpd (ftp without TCP wrappers)
# /etc/ftpd/banner.msg (ftp without TCP wrappers on Solaris)
# /etc/ftpaccess (HP-UX)
# /etc/ftpmotd (AIX)
# /etc/ftpaccess.ctl (AIX)
# /etc/security/login.cfg (AIX)
# /etc/X11/xdm/Xresources
# /etc/X11/xdm/kdmrc
# /etc/X11/gdm/gdm
# /etc/vsftpd.conf
#
#################################################################################
#

wait_for_keypress

#
#################################################################################
#
# Notes:
# HPUX: /etc/copyright
#
#================================================================================
# Lynis - Copyright 2007-2015, Michael Boelen, CISOfy - https://cisofy.com