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#!/bin/sh
#################################################################################
#
# 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.
#
#################################################################################
#
# Banners and identification
#
#################################################################################
#
InsertSection "Banners and identification"
#
#################################################################################
#
BANNER_FILES="/etc/issue /etc/issue.net /etc/motd"
LEGAL_BANNER_STRINGS="audit access authori connect enforce evidence 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 --category security --description "Check COPYRIGHT banner file"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: Testing existence /COPYRIGHT or /etc/COPYRIGHT"
if [ -f /COPYRIGHT ]; then
Display --indent 2 --text "- /COPYRIGHT" --result "${STATUS_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 "${STATUS_NOT_FOUND}" --color WHITE
LogText "Result: /COPYRIGHT not found"
fi
if [ -f /etc/COPYRIGHT ]; then
Display --indent 2 --text "- /etc/COPYRIGHT" --result "${STATUS_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 "${STATUS_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 --category security --description "Check MOTD banner file"
#if [ ${SKIPTEST} -eq 0 ]; then
# LogText "Test: Testing existence /etc/motd"
# if [ -f /etc/motd ]; then
# LogText "Result: file /etc/motd exists"
# Display --indent 2 --text "- /etc/motd" --result "${STATUS_FOUND}" --color GREEN
# if [ ! -L /etc/motd ]; then
# if IsWorldWritable /etc/motd; then
# Display --indent 4 --text "- /etc/motd permissions" --result "${STATUS_WARNING}" --color RED
# LogText "Result: /etc/motd is world writable. Users can change this file!"
# ReportWarning ${TEST_NO} "/etc/motd is world writable"
# else
# Display --indent 4 --text "- /etc/motd permissions" --result "${STATUS_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 "${STATUS_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 --category security --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 ${LEGAL_BANNER_STRINGS}; do
# FIND=`${GREPBINARY} -i "${I}" /etc/motd`
# if [ ! "${FIND}" = "" ]; then
# LogText "Result: found string '${I}'"
# N=$((N + 1))
# fi
# done
# # Check if we have 5 or more key words
# if [ ${N} -gt 4 ]; then
# LogText "Result: Found ${N} key words, to warn unauthorized users"
# Display --indent 4 --text "- /etc/motd contents" --result "${STATUS_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 --category security --description "Check issue banner file"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: Checking file /etc/issue"
if [ -f /etc/issue ]; then
# Check for symlink
if [ -L /etc/issue ]; then
LogText "Result: file /etc/issue exists (symlink)"
Display --indent 2 --text "- /etc/issue" --result SYMLINK --color GREEN
else
Display --indent 2 --text "- /etc/issue" --result "${STATUS_FOUND}" --color GREEN
fi
else
LogText "Result: file /etc/issue does not exist"
Display --indent 2 --text "- /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 /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 [ ${SKIPTEST} -eq 0 ]; then
N=0
FILE="${ROOTDIR}etc/issue"
LogText "Test: Checking file ${FILE} contents for legal key words"
for I in ${LEGAL_BANNER_STRINGS}; do
FIND=$(${GREPBINARY} -i "${I}" ${FILE})
if [ ! -z "${FIND}" ]; then
LogText "Result: found string '${I}'"
N=$((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 "- ${FILE} contents" --result "${STATUS_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 "- ${FILE} contents" --result 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 [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: Checking file /etc/issue.net"
if [ -f /etc/issue.net ]; then
# Check for symlink
if [ -L /etc/issue.net ]; then
LogText "Result: file /etc/issue.net exists (symlink)"
Display --indent 2 --text "- /etc/issue.net" --result SYMLINK --color GREEN
else
LogText "Result: file /etc/issue.net exists"
Display --indent 2 --text "- /etc/issue.net" --result "${STATUS_FOUND}" --color GREEN
fi
else
LogText "Result: file /etc/issue.net does not exist"
Display --indent 2 --text "- /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 /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
N=0
LogText "Test: Checking file /etc/issue.net contents for legal key words"
for I in ${LEGAL_BANNER_STRINGS}; do
FIND=`${GREPBINARY} -i "${I}" /etc/issue.net`
if [ ! "${FIND}" = "" ]; then
LogText "Result: found string '${I}'"
N=$((N + 1))
fi
done
# Check if we have 5 or more key words
if [ ${N} -gt 4 ]; then
LogText "Result: Found ${N} key words, to warn unauthorized users"
Display --indent 4 --text "- /etc/issue.net contents" --result "${STATUS_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
#
#################################################################################
#
WaitForKeyPress
#
#================================================================================
# Lynis - Security Auditing and System Hardening for Linux and UNIX - https://cisofy.com
|
