lynis/include/tests_insecure_services

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#!/bin/sh
#################################################################################
#
# Lynis
# ------------------
#
# Copyright 2007-2013, Michael Boelen
# Copyright 2007-2019, 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.
#
#################################################################################
#
# Insecure services
#
#################################################################################
#
InsertSection "Insecure services"
#
#################################################################################
#
INETD_ACTIVE=0
INETD_CONFIG_FILE="${ROOTDIR}etc/inetd.conf"
INETD_PACKAGE_INSTALLED=0
XINETD_ACTIVE=0
XINETD_CONFIG_FILE="${ROOTDIR}etc/xinetd.conf"
XINETD_CONFIG_DIR="${ROOTDIR}etc/xinetd.d"
#
#################################################################################
#
# Test : INSE-8000
# Description : Check for installed inetd package
Register --test-no INSE-8000 --weight L --network NO --category security --description "Installed inetd package"
if [ ${SKIPTEST} -eq 0 ]; then
# Check for installed inetd daemon
LogText "Test: Checking if inetd is installed"
if PackageIsInstalled "inetd"; then
INETD_PACKAGE_INSTALLED=1
LogText "Result: inetd is installed"
Display --indent 2 --text "- Installed inetd package" --result "${STATUS_FOUND}" --color YELLOW
#ReportSuggestion ${TEST_NO} "If there are no inetd services required, it is recommended that the daemon be removed"
else
LogText "Result: inetd is NOT installed"
Display --indent 2 --text "- Installed inetd package" --result "${STATUS_NOT_FOUND}" --color GREEN
fi
fi
#
#################################################################################
#
# Test : INSE-8002
# Description : Check for inetd status
if [ ${INETD_PACKAGE_INSTALLED} -eq 1 ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no INSE-8002 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check for enabled inet daemon"
if [ ${SKIPTEST} -eq 0 ]; then
# Check running processes
LogText "Test: Searching for active inet daemon"
if IsRunning "inetd"; then
LogText "Result: inetd is running"
Display --indent 4 --text "- inetd status" --result "ACTIVE" --color GREEN
INETD_ACTIVE=1
else
LogText "Result: inetd is NOT running"
Display --indent 4 --text "- inetd status" --result "NOT ACTIVE" --color GREEN
fi
fi
#
#################################################################################
#
# Test : INSE-8004
# Description : Check for inetd configuration file (inetd)
if [ ${INETD_ACTIVE} -eq 1 ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no INSE-8004 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Presence of inetd configuration file"
if [ ${SKIPTEST} -eq 0 ]; then
# Check configuration file
LogText "Test: Searching for file ${INETD_CONFIG_FILE}"
if [ -f ${INETD_CONFIG_FILE} ]; then
LogText "Result: ${INETD_CONFIG_FILE} exists"
Display --indent 4 --text "- Checking inetd.conf" --result "${STATUS_FOUND}" --color WHITE
else
LogText "Result: ${INETD_CONFIG_FILE} does not exist"
Display --indent 4 --text "- Checking inetd.conf" --result "${STATUS_NOT_FOUND}" --color WHITE
fi
fi
#
#################################################################################
#
# Test : INSE-8006
# Description : Check for inetd configuration file contents if inetd is NOT active
if [ ${INETD_ACTIVE} -eq 0 -a -f ${INETD_CONFIG_FILE} ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no INSE-8006 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check configuration of inetd when disabled"
if [ ${SKIPTEST} -eq 0 ]; then
# Check if any service is enabled in /etc/inetd.conf (inetd is not active, see test INSE-8002)
LogText "Test: check if all services are disabled when inetd is disabled"
FIND=$(${GREPBINARY} -v "^#" ${INETD_CONFIG_FILE} | ${GREPBINARY} -v "^$")
if [ -z "${FIND}" ]; then
LogText "Result: no services found in ${INETD_CONFIG_FILE}"
Display --indent 4 --text "- Checking enabled inetd services" --result "${STATUS_OK}" --color GREEN
else
LogText "Result: found services in inetd, even though inetd is not running"
Display --indent 4 --text "- Checking enabled inetd services" --result "${STATUS_SUGGESTION}" --color YELLOW
ReportSuggestion ${TEST_NO} "Although inetd is not running, make sure no services are enabled in ${INETD_CONFIG_FILE}, or remove inetd service"
fi
fi
#
#################################################################################
#
# Test : INSE-8016
# Description : Check for telnet enabled via inetd
if [ ${INETD_ACTIVE} -eq 1 -a -f ${INETD_CONFIG_FILE} ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no INSE-8016 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check for telnet via inetd"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: checking telnet presence in inetd configuration"
FIND=$(${GREPBINARY} "^telnet" ${INETD_CONFIG_FILE})
if [ -z "${FIND}" ]; then
LogText "Result: telnet not enabled in ${INETD_CONFIG_FILE}"
Display --indent 2 --text "- Checking inetd (telnet)" --result "${STATUS_NOT_FOUND}" --color GREEN
AddHP 3 3
else
LogText "Result: telnet enabled in ${INETD_CONFIG_FILE}"
Display --indent 2 --text "- Checking inetd (telnet)" --result "${STATUS_WARNING}" --color RED
ReportSuggestion "${TEST_NO}" "Disable telnet in inetd configuration and use SSH instead"
AddHP 1 3
fi
fi
#
#################################################################################
#
# Test : INSE-8100
# Description : Check for installed xinetd daemon
Register --test-no INSE-8100 --weight L --network NO --category security --description "Check for installed xinetd daemon"
if [ ${SKIPTEST} -eq 0 ]; then
# Check for installed xinetd daemon
LogText "Test: Checking for installed xinetd daemon"
if PackageIsInstalled "xinetd"; then
LogText "Result: xinetd is installed"
Display --indent 2 --text "- Installed xinetd package" --result "${STATUS_FOUND}" --color YELLOW
ReportSuggestion ${TEST_NO} "If there are no xinetd services required, it is recommended that the daemon be removed"
else
LogText "Result: xinetd is NOT installed"
Display --indent 2 --text "- Installed xinetd package" --result "${STATUS_OK}" --color GREEN
fi
fi
#
#################################################################################
#
# Test : INSE-8102
# Description : Check for xinetd status
Register --test-no INSE-8102 --weight L --network NO --category security --description "Check for active xinet daemon"
if [ ${SKIPTEST} -eq 0 ]; then
# Check running processes
LogText "Test: Searching for active extended internet services daemon (xinetd)"
if IsRunning "xinetd"; then
LogText "Result: xinetd is running"
Display --indent 4 --text "- xinetd status" --result "ACTIVE" --color GREEN
XINETD_ACTIVE=1
else
LogText "Result: xinetd is NOT running"
Display --indent 4 --text "- xinetd status" --result "NOT ACTIVE" --color GREEN
fi
fi
#
#################################################################################
#
# Test : INSE-8104
# Description : Check for xinetd configuration file
if [ ${XINETD_ACTIVE} -eq 1 ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no INSE-8104 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check for enabled xinet daemon"
if [ ${SKIPTEST} -eq 0 ]; then
# Check configuration file
LogText "Test: Searching for file ${XINETD_CONFIG_FILE}"
if [ -f "${XINETD_CONFIG_FILE}" ]; then
LogText "Result: ${XINETD_CONFIG_FILE} exists"
Display --indent 6 --text "- Configuration file (xinetd.conf)" --result "${STATUS_FOUND}" --color WHITE
else
LogText "Result: ${XINETD_CONFIG_FILE} does not exist"
Display --indent 6 --text "- Configuration file (xinetd.conf)" --result "${STATUS_NOT_FOUND}" --color WHITE
fi
fi
#
#################################################################################
#
# Test : INSE-8106
# Description : Check for xinetd configuration file contents if xinetd is NOT active
if [ ${XINETD_ACTIVE} -eq 0 -a -f ${XINETD_CONFIG_FILE} ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no INSE-8106 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check configuration of xinetd when disabled"
if [ ${SKIPTEST} -eq 0 ]; then
# Check if any service is enabled in /etc/xinetd.d (xinetd is not active, see test INSE-8102)
LogText "Test: check if all services are disabled if xinetd is disabled"
FIND=$(${GREPBINARY} -r "disable\s*=\s*no" ${XINETD_CONFIG_DIR})
if [ -z "${FIND}" ]; then
LogText "Result: no services found in ${XINETD_CONFIG_DIR}"
Display --indent 6 --text "- Enabled xinetd.d services" --result "${STATUS_NOT_FOUND}" --color GREEN
else
LogText "Result: found services in ${XINETD_CONFIG_DIR}, even though xinetd is not running"
Display --indent 6 --text "- Enabled xinetd.d services" --result "${STATUS_FOUND}" --color YELLOW
ReportSuggestion ${TEST_NO} "Although xinetd is not running, make sure no services are enabled in ${XINETD_CONFIG_DIR}, or remove xinetd service"
fi
fi
#
#################################################################################
#
# Test : INSE-8116
# Description : Check for insecure services enabled via xinetd
if [ ${XINETD_ACTIVE} -eq 1 ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no INSE-8116 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Insecure services enabled via xinetd"
if [ ${SKIPTEST} -eq 0 ]; then
XINETD_INSECURE_SERVICE_FOUND=0
ITEMS="chargen chargen-dgram chargen-stream daytime daytime-dgram daytime-stream discard discard-dgram discard-stream echo echo-dgram echo-stream time time-dgram time-stream ntalk rexec rlogin rsh talk telnet tftp"
for SERVICE in ${ITEMS}; do
LogText "Test: checking service ${SERVICE}"
if ! SkipAtomicTest "${TEST_NO}:${SERVICE}"; then
FILE="${XINETD_CONFIG_DIR}/${SERVICE}"
if [ -f "${FILE}" ]; then
LogText "Test: checking status in xinetd configuration file (${FILE})"
FIND=$(${GREPBINARY} "disable\s*=\s*no" ${FILE})
if [ ! -z "${FIND}" ]; then
LogText "Result: found insecure service enabled: ${SERVICE}"
XINETD_INSECURE_SERVICE_FOUND=1
ReportSuggestion "${TEST_NO}" "Disable or remove any insecure services in the xinetd configuration" "${SERVICE}" "text:See log file for more details"
Report "insecure_service[]=${SERVICE}"
fi
fi
else
LogText "Result: skipped, as this item is excluded using the profile"
fi
done
if [ ${XINETD_INSECURE_SERVICE_FOUND} -eq 0 ]; then
LogText "Result: no insecure services found in xinetd configuration"
Display --indent 6 --text "- Checking xinetd (insecure services)" --result "${STATUS_OK}" --color GREEN
AddHP 3 3
else
LogText "Result: one ore more insecure services discovered in xinetd configuration"
Display --indent 6 --text "- Checking xinetd (insecure services)" --result "${STATUS_WARNING}" --color RED
AddHP 0 3
fi
fi
#
#################################################################################
#
# Test : INSE-8150
# Description : Check for rsync enabled via xinetd
#RSYNC_XINETD_CONFIG_FILE="${XINETD_CONFIG_DIR}/rsync"
#if [ ${XINETD_ACTIVE} -eq 1 -a -f ${RSYNC_XINETD_CONFIG_FILE} ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
#Register --test-no INSE-8150 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check for rsync via xinetd"
#if [ ${SKIPTEST} -eq 0 ]; then
# LogText "Test: checking rsync presence in xinetd configuration"
# FIND=$(${GREPBINARY} "disable\s*=\s*no" ${RSYNC_XINETD_CONFIG_FILE})
# if [ "${FIND}" = "" ]; then
# LogText "Result: rsync not enabled in ${RSYNC_XINETD_CONFIG_FILE}"
# Display --indent 6 --text "- Checking xinetd (rsync)" --result "${STATUS_DISABLED}" --color GREEN
# else
# LogText "Result: rsync enabled in ${RSYNC_XINETD_CONFIG_FILE}"
# Display --indent 6 --text "- Checking xinetd (rsync)" --result "${STATUS_ENABLED}" --color RED
# ReportSuggestion "${TEST_NO}" "Disable rsync in xinetd configuration"
# fi
#fi
#
#################################################################################
#
# Test : INSE-8200
# Description : Check if tcp_wrappers is installed when inetd/xinetd is active
if [ ${INETD_ACTIVE} -eq 1 -o ${XINETD_ACTIVE} -eq 1 ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no INSE-8200 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check if tcp_wrappers is installed when inetd/xinetd is active"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: Checking if tcp_wrappers is installed"
FOUND=0
PACKAGES="tcp_wrappers tcpd"
for PACKAGE in ${PACKAGES}; do
if PackageIsInstalled "${PACKAGE}"; then LogText "Package '${PACKAGE}' is installed"; FOUND=1; fi
done
if [ ${FOUND} -eq 1 ]; then
LogText "Result: tcp_wrappers is installed"
Display --indent 2 --text "- Checking tcp_wrappers installation" --result "${STATUS_OK}" --color GREEN
else
LogText "Result: tcp_wrappers is NOT installed"
Display --indent 2 --text "- Checking tcp_wrappers installation" --result "${STATUS_SUGGESTION}" --color YELLOW
#ReportSuggestion ${TEST_NO} "When network services are using the inetd/xinetd service, the tcp_wrappers package should be installed"
fi
fi
#
#################################################################################
#
# Test : INSE-8300
# Description : Check if rsh client is installed
Register --test-no INSE-8300 --weight L --network NO --category security --description "Check if rsh client is installed"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: Checking if rsh client is installed"
FOUND=0
PACKAGES="rsh rsh-client rsh-redone-client"
for PACKAGE in ${PACKAGES}; do
if PackageIsInstalled "${PACKAGE}"; then LogText "Package '${PACKAGE}' is installed"; FOUND=1; fi
done
if [ ${FOUND} -eq 1 ]; then
LogText "Result: rsh client is installed"
Display --indent 2 --text "- Installed rsh client package" --result "${STATUS_SUGGESTION}" --color YELLOW
ReportSuggestion ${TEST_NO} "Remove rsh client when it is not in use or replace with the more secure SSH package"
else
LogText "Result: rsh client is NOT installed"
Display --indent 2 --text "- Installed rsh client package" --result "${STATUS_OK}" --color GREEN
fi
fi
#
#################################################################################
#
# Test : INSE-8302
# Description : Check presence of rsh Trust Files
#Register --test-no INSE-8302 --weight L --network NO --category security --description "Check presence of rsh Trust Files"
#if [ ${SKIPTEST} -eq 0 ]; then
# # Check presence of Rsh Trust Files
# FOUND=0
# for LINE in $(${CAT_BINARY} /etc/passwd | ${EGREPBINARY} -v '^(root|halt|sync|shutdown)' | ${AWKBINARY} -F: '($7 !="/sbin/nologin" && $7 != "/bin/false") { print }'); do
# USER=$(echo ${LINE} | ${CUTBINARY} -d: -f1)
# DIR=$(echo ${LINE} | ${CUTBINARY} -d: -f6)
# if [ -d ${DIR} ]; then
# for RHOSTS in ${DIR}/.rhosts; do
# if [ ! -h ${RHOSTS} -a -f ${RHOSTS} ]; then
# LogText "FOUND .rhosts file in home directory ${DIR} of ${USER}"
# FOUND=1
# fi
# done
# fi
# done
# if [ -f /etc/hosts.equiv ];then
# LogText "FOUND /etc/hosts.equiv"
# FOUND=1
# fi
# if [ ${FOUND} -eq 1 ]; then
# LogText "Result: found one or more Rsh Trust Files"
# Display --indent 4 --text "- Checking presence of Rsh Trust Files" --result "${STATUS_SUGGESTION}" --color YELLOW
# ReportSuggestion ${TEST_NO} "Remove every Rsh Trust Files as they can allow unauthenticated access to a system"
# else
# LogText "Result: no Rsh Trust Files found"
# Display --indent 4 --text "- Checking presence of Rsh Trust Files" --result "${STATUS_OK}" --color GREEN
# fi
#fi
#
#################################################################################
#
# Test : INSE-8304
# Description : Check if rsh server is installed
Register --test-no INSE-8342 --weight L --network NO --category security --description "Check if rsh server is installed"
if [ ${SKIPTEST} -eq 0 ]; then
# Check if rsh server is installed
LogText "Test: Checking if rsh server is installed"
FOUND=0
PACKAGES="rsh-server rsh-redone-server"
for PACKAGE in ${PACKAGES}; do
if PackageIsInstalled "${PACKAGE}"; then LogText "Package '${PACKAGE}' is installed"; FOUND=1; fi
done
if [ ${FOUND} -eq 1 ]; then
LogText "Result: rsh server is installed"
Display --indent 2 --text "- Installed rsh server package" --result "${STATUS_SUGGESTION}" --color YELLOW
ReportSuggestion ${TEST_NO} "Remove the rsh-server package and replace with a more secure alternative like SSH"
Report "insecure_service[]=rsh-server"
else
LogText "Result: rsh server is NOT installed"
Display --indent 2 --text "- Installed rsh server package" --result "${STATUS_OK}" --color GREEN
fi
fi
#
#################################################################################
#
# Test : INSE-8310
# Description : Check if telnet client is installed
Register --test-no INSE-8310 --weight L --network NO --category security --description "Check if telnet client is installed"
if [ ${SKIPTEST} -eq 0 ]; then
# Check if telnet client is installed
LogText "Test: Checking if telnet client is installed"
if PackageIsInstalled "${PACKAGE}"; then LogText "Package '${PACKAGE}' is installed"; FOUND=1; fi
if [ ${FOUND} -eq 1 ]; then
LogText "Result: telnet client is installed"
Display --indent 2 --text "- Installed telnet client package" --result "${STATUS_FOUND}" --color YELLOW
# Telnet client usage might be used for troubleshooting instead of system administration
#ReportSuggestion ${TEST_NO} "telnet client contain numerous security exposures and have been replaced with the more secure SSH package"
else
LogText "Result: telnet client is NOT installed"
Display --indent 2 --text "- Installed telnet client package" --result "${STATUS_OK}" --color GREEN
fi
fi
#
#################################################################################
#
# Test : INSE-8312
# Description : Check if telnet server is installed
Register --test-no INSE-8322 --weight L --network NO --category security --description "Check if telnet server is installed"
if [ ${SKIPTEST} -eq 0 ]; then
# Check if TFTP server is installed
LogText "Test: Checking if telnet server is installed"
FOUND=0
PACKAGES="telnetd telnet-server"
for PACKAGE in ${PACKAGES}; do
if PackageIsInstalled "${PACKAGE}"; then LogText "Package '${PACKAGE}' is installed"; FOUND=1; fi
done
if [ ${FOUND} -eq 1 ]; then
LogText "Result: telnet server is installed"
Display --indent 2 --text "- Installed telnet server package" --result "${STATUS_FOUND}" --color YELLOW
ReportSuggestion ${TEST_NO} "Removing the ${FOUND} package and replace with SSH when possible"
Report "insecure_service[]=telnet-server"
else
LogText "Result: telnet server is NOT installed"
Display --indent 2 --text "- Installed telnet server package" --result "${STATUS_NOT_FOUND}" --color GREEN
fi
fi
#
#################################################################################
#
if [ ! -z "${LAUNCHCTL_BINARY}" ]; then PREQS_MET="YES"; SKIPREASON=""; else PREQS_MET="NO"; SKIPREASON="No launchctl binary on this system"; fi
Register --test-no INSE-8050 --os "macOS" --preqs-met ${PREQS_MET} --skip-reason "${SKIPREASON}" --weight M --network NO --category security --description "Check for insecure services on macOS"
if [ ${SKIPTEST} -eq 0 ]; then
TEST_SERVICES="com.apple.fingerd"
for ITEM in ${TEST_SERVICES}; do
if ${LAUNCHCTL_BINARY} print-enabled system | grep -sq ${ITEM}; then
Display --indent 2 --text "- $text" --result "${STATUS_NO}" --color RED
LogText "Result: found ${ITEM}, which is considered an insecure service"
AddSuggestion "${TEST_NO}" "Consider disabling service ${ITEM}" "launchctl" "-"
AddHP 0 1
else
Display --indent 2 --text "- $text" --result "${STATUS_OK}" --color GREEN
LogText "Result: $text, OK"
AddHP 1 1
fi
done
fi
#
#################################################################################
#
# To do:
# - mark in report when a system was tested for any insecure services
WaitForKeyPress
#
#================================================================================
# Lynis - Security Auditing and System Hardening for Linux and UNIX - https://cisofy.com