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#!/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.
#
#################################################################################
#
# Squid
#
#################################################################################
#
SQUID_DAEMON_CONFIG_LOCS="/etc /etc/squid /etc/squid3 /usr/local/etc/squid /usr/local/squid/etc"
SQUID_DAEMON_CONFIG=""
SQUID_DAEMON_UNSAFE_PORTS_LIST="22 23 25"
SQUID_DAEMON_RUNNING=0
#
#################################################################################
#
InsertSection "Squid Support"
#
#################################################################################
#
# Test : SQD-3602
# Description : Check for a running Squid daemon
# Notes : Search for squid(3) with a space, to avoid SquidGuard and other
# programs.
Register --test-no SQD-3602 --weight L --network NO --description "Check for running Squid daemon"
if [ ${SKIPTEST} -eq 0 ]; then
logtext "Test: Searching for a Squid daemon"
FOUND=0
# Check running processes
FIND=`${PSBINARY} ax | egrep "(squid|squid3) " | grep -v "grep"`
if [ ! "${FIND}" = "" ]; then
SQUID_DAEMON_RUNNING=1
logtext "Result: Squid daemon is running"
Display --indent 2 --text "- Checking running Squid daemon" --result FOUND --color GREEN
else
logtext "Result: No running Squid daemon found"
Display --indent 2 --text "- Checking running Squid daemon" --result "NOT FOUND" --color WHITE
fi
fi
#
#################################################################################
#
# Test : SQD-3604
# Description : Determine Squid daemon configuration file location
if [ ${SQUID_DAEMON_RUNNING} -eq 1 ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no SQD-3604 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check Squid daemon file location"
if [ ${SKIPTEST} -eq 0 ]; then
logtext "Test: searching for squid.conf or squid3.conf file"
for I in ${SQUID_DAEMON_CONFIG_LOCS}; do
# Checking squid.conf
if [ -f "${I}/squid.conf" ]; then
logtext "Result: ${I}/squid.conf exists"
SQUID_DAEMON_CONFIG="${I}/squid.conf"
fi
# Checking squid3.conf
if [ -f "${I}/squid3.conf" ]; then
logtext "Result: ${I}/squid3.conf exists"
SQUID_DAEMON_CONFIG="${I}/squid3.conf"
fi
done
if [ "${SQUID_DAEMON_CONFIG}" = "" ]; then
logtext "Result: No Squid configuration file found"
Display --indent 4 --text "- Searching Squid configuration file" --result "NOT FOUND" --color YELLOW
else
logtext "Result: using last found configuration file: ${SQUID_DAEMON_CONFIG}"
Display --indent 4 --text "- Searching Squid configuration" --result FOUND --color GREEN
fi
fi
#
#################################################################################
#
# Test : SQD-3606
# Description : Check Squid version
if [ ${SQUID_DAEMON_RUNNING} -eq 1 -a ! "${SQUID_DAEMON_CONFIG}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no SQD-3606 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check Squid version"
if [ ${SKIPTEST} -eq 0 ]; then
if [ ! "${SQUIDBINARY}" = "" ]; then
logtext "Result: Squid binary found (${SQUIDBINARY})"
# Skip check if a setuid/setgid bit is found
FIND=`find ${SQUIDBINARY} \( -perm 4000 -o -perm 2000 \) -print`
if [ "${FIND}" = "" ]; then
FIND2=`${SQUIDBINARY} -v | awk '{ if ($3=="Version") { print $4 } }'`
Display --indent 4 --text "- Checking Squid version" --result "FOUND" --color GREEN
SQUID_VERSION="${FIND2}"
else
logtext "Result: test skipped for security reasons, setuid/setgid bit set"
Display --indent 4 --text "- Checking Squid version" --result "SKIPPED" --color RED
fi
else
logtext "Result: no Squid binary found"
fi
fi
#
#################################################################################
#
# # Test : SQD-3608
# # Description : Check Squid build options
# if [ ${SQUID_DAEMON_RUNNING} -eq 1 -a ! "${SQUID_DAEMON_CONFIG}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
# Register --test-no SQD-3608 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check Squid version"
# if [ ${SKIPTEST} -eq 0 ]; then
# fi
#
#################################################################################
#
# Test : SQD-3610
# Description : Check Squid configuration options
if [ ${SQUID_DAEMON_RUNNING} -eq 1 -a ! "${SQUID_DAEMON_CONFIG}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no SQD-3610 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check Squid version"
if [ ${SKIPTEST} -eq 0 ]; then
logtext "Test: Checking all specific defined options in ${SQUID_DAEMON_CONFIG}"
FIND=`cat ${SQUID_DAEMON_CONFIG} | grep -v "^#" | grep -v "^$" | ${AWKBINARY} '{gsub("\t"," ");print}' | sed 's/ /!space!/g'`
for I in ${FIND}; do
I=`echo ${I} | sed 's/!space!/ /g'`
logtext "Found Squid option: ${I}"
report "squid_option=${I}"
done
Display --indent 4 --text "- Checking defined Squid options" --result "DONE" --color GREEN
fi
#
#################################################################################
#
# # Test : SQD-3612
# # Description : Check Squid additional configuration files
# if [ ${SQUID_DAEMON_RUNNING} -eq 1 -a ! "${SQUID_DAEMON_CONFIG}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
# Register --test-no SQD-3612 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check additional Squid configuration files"
# if [ ${SKIPTEST} -eq 0 ]; then
# fi
#
#################################################################################
#
# Test : SQD-3613
# Description : Check Squid configuration options
if [ ${SQUID_DAEMON_RUNNING} -eq 1 -a ! "${SQUID_DAEMON_CONFIG}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no SQD-3613 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check Squid file permissions"
if [ ${SKIPTEST} -eq 0 ]; then
logtext "Test: Checking file permissions of ${SQUID_DAEMON_CONFIG}"
FIND=`find ${SQUID_DAEMON_CONFIG} -type f -a \( -perm -004 -o -perm -002 -o -perm -001 \)`
if [ ! "${FIND}" = "" ]; then
logtext "Result: file ${SQUID_DAEMON_CONFIG} is world readable, writable or executable and could leak information or passwords"
Display --indent 4 --text "- Checking Squid configuration file permissions" --result WARNING --color RED
ReportSuggestion ${TEST_NO} "Check file permissions of ${SQUID_DAEMON_CONFIG} to limit access"
ReportWarning ${TEST_NO} "M" "File permissions of ${SQUID_DAEMON_CONFIG} are not restrictive"
AddHP 0 2
else
logtext "Result: file ${SQUID_DAEMON_CONFIG} has proper file permissions"
Display --indent 4 --text "- Checking Squid configuration file permissions" --result OK --color GREEN
AddHP 2 2
fi
fi
#
#################################################################################
#
if [ ${SQUID_DAEMON_RUNNING} -eq 1 -a ! "${SQUID_DAEMON_CONFIG}" = "" ]; then
Display --indent 4 --text "- Checking Squid access control"
fi
#
#################################################################################
#
# Test : SQD-3614
# Description : Check Squid authentication
if [ ${SQUID_DAEMON_RUNNING} -eq 1 -a ! "${SQUID_DAEMON_CONFIG}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no SQD-3614 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check Squid authentication methods"
if [ ${SKIPTEST} -eq 0 ]; then
logtext "Test: check auth_param option for authentication methods"
FIND=`grep "^auth_param" ${SQUID_DAEMON_CONFIG} | awk '{ print $2 }'`
if [ "${FIND}" = "" ]; then
logtext "No auth_param option found, proxy access anonymous or based on other methods (like ACLs)"
Display --indent 6 --text "- Checking Squid authentication methods" --result "NONE" --color YELLOW
else
Display --indent 6 --text "- Checking Squid authentication methods" --result "FOUND" --color GREEN
for I in ${FIND}; do
logtext "Result: found authentication method ${I}"
report "squid_auth_method=${I}"
done
fi
fi
#
#################################################################################
#
# Test : SQD-3616
# Description : Check external Squid authentication
if [ ${SQUID_DAEMON_RUNNING} -eq 1 -a ! "${SQUID_DAEMON_CONFIG}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no SQD-3616 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check external Squid authentication"
if [ ${SKIPTEST} -eq 0 ]; then
logtext "Test: check external_acl_type option for external authentication helpers"
FIND=`grep "^external_acl_type" ${SQUID_DAEMON_CONFIG}`
if [ "${FIND}" = "" ]; then
logtext "No external_acl_type found"
Display --indent 6 --text "- Checking Squid external authentication methods" --result "NONE" --color YELLOW
else
Display --indent 6 --text "- Checking Squid external authentication methods" --result "FOUND" --color GREEN
for I in ${FIND}; do
logtext "Result: found external authentication method helper"
logtext "Output: ${FIND}"
#report "squid_external_acl_type=TRUE"
done
fi
fi
#
#################################################################################
#
# Test : SQD-3620
# Description : Check ACLs
if [ ${SQUID_DAEMON_RUNNING} -eq 1 -a ! "${SQUID_DAEMON_CONFIG}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no SQD-3620 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check Squid access control lists"
if [ ${SKIPTEST} -eq 0 ]; then
N=0
logtext "Test: checking ACLs"
FIND=`grep "^acl " ${SQUID_DAEMON_CONFIG} | sed 's/ /!space!/g'`
if [ "${FIND}" = "" ]; then
logtext "Result: No ACLs found"
Display --indent 6 --text "- Checking Access Control Lists" --result "NONE" --color RED
else
for I in ${FIND}; do
N=`expr ${N} + 1`
I=`echo ${I} | sed 's/!space!/ /g'`
logtext "Found ACL: ${I}"
#report "squid_acl=${I}"
done
logtext "Result: Found ${N} ACLs"
Display --indent 6 --text "- Checking Access Control Lists" --result "${N} ACLs FOUND" --color GREEN
fi
fi
#
#################################################################################
#
# Test : SQD-3624 [T]
# Description : Check unsecure ports in Safe_ports list
if [ ${SQUID_DAEMON_RUNNING} -eq 1 -a ! "${SQUID_DAEMON_CONFIG}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no SQD-3624 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check Squid safe ports"
if [ ${SKIPTEST} -eq 0 ]; then
N=0
logtext "Test: checking ACL Safe_ports http_access option"
FIND=`grep "^http_access" ${SQUID_DAEMON_CONFIG} | grep "Safe_ports"`
if [ "${FIND}" = "" ]; then
logtext "Result: no Safe_ports found"
Display --indent 6 --text "- Checking ACL 'Safe_ports' http_access option" --result "NOT FOUND" --color YELLOW
ReportSuggestion ${TEST_NO} "Check if Squid has been configured to restrict access to all safe ports"
else
logtext "Result: checking ACL safe ports"
FIND2=`grep "^acl Safe_ports port" ${SQUID_DAEMON_CONFIG} | awk '{ print $4 }'`
if [ "${FIND2}" = "" ]; then
Display --indent 6 --text "- Checking ACL 'Safe_ports' ports" --result "NONE FOUND" --color YELLOW
ReportSuggestion ${TEST_NO} "Check if Squid has been configured for which ports it can allow outgoing traffic (Safe_ports)"
AddHP 0 1
else
logtext "Result: Safe_ports found"
for I in ${FIND}; do
logtext "Found safe port: ${I}"
done
Display --indent 6 --text "- Checking ACL 'Safe_ports' ports" --result "FOUND" --color GREEN
AddHP 1 1
fi
#SQUID_DAEMON_UNSAFE_PORTS_LIST
for I in ${SQUID_DAEMON_UNSAFE_PORTS_LIST}; do
logtext "Test: Checking port ${I} in Safe_ports list"
FIND2=`grep -w "^acl Safe_ports port ${I}" ${SQUID_DAEMON_CONFIG}`
if [ "${FIND2}" = "" ]; then
Display --indent 6 --text "- Checking ACL 'Safe_ports' (port ${I})" --result "NOT FOUND" --color GREEN
AddHP 1 1
else
Display --indent 6 --text "- Checking ACL 'Safe_ports' (port ${I})" --result "FOUND" --color RED
ReportWarning ${TEST_NO} "H" "Squid configuration possibly allows relaying traffic via configured Safe_port ${I}"
AddHP 0 1
fi
done
fi
fi
#
#################################################################################
#
if [ ${SQUID_DAEMON_RUNNING} -eq 1 -a ! "${SQUID_DAEMON_CONFIG}" = "" ]; then
Display --indent 4 --text "- Checking Squid Denial of Service tuning options"
fi
#
#################################################################################
#
# Test : SQD-3630 [T]
# Description : Check reply_body_max_size value
if [ ${SQUID_DAEMON_RUNNING} -eq 1 -a ! "${SQUID_DAEMON_CONFIG}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no SQD-3630 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check Squid reply_body_max_size option"
if [ ${SKIPTEST} -eq 0 ]; then
N=0
logtext "Test: checking option reply_body_max_size"
FIND=`grep "^reply_body_max_size " ${SQUID_DAEMON_CONFIG} | sed 's/ /!space!/g'`
if [ "${FIND}" = "" ]; then
logtext "Result: option reply_body_max_size not configured"
Display --indent 6 --text "- Checking option: reply_body_max_size" --result "NONE" --color RED
AddHP 1 2
ReportSuggestion ${TEST_NO} "Configure Squid option reply_body_max_size to limit the upper size of requests."
else
logtext "Result: option reply_body_max_size configured"
logtext "Output: ${FIND}"
Display --indent 6 --text "- Checking option: reply_body_max_size" --result "FOUND" --color GREEN
AddHP 2 2
fi
fi
#
#################################################################################
#
if [ ${SQUID_DAEMON_RUNNING} -eq 1 -a ! "${SQUID_DAEMON_CONFIG}" = "" ]; then
Display --indent 4 --text "- Checking Squid general options"
fi
#
#################################################################################
#
# Test : SQD-3680
# Description : Check httpd_suppress_version_string
if [ ${SQUID_DAEMON_RUNNING} -eq 1 -a ! "${SQUID_DAEMON_CONFIG}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no SQD-3680 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check Squid version suppresion"
if [ ${SKIPTEST} -eq 0 ]; then
FIND=`grep "^httpd_suppress_version_string " ${SQUID_DAEMON_CONFIG} | grep " on"`
if [ "${FIND}" = "" ]; then
logtext "Result: option httpd_suppress_version_string not configured"
Display --indent 6 --text "- Checking option: httpd_supress_version_string" --result "NOT FOUND" --color YELLOW
AddHP 1 2
ReportSuggestion ${TEST_NO} "Configure Squid option httpd_suppress_version_string (on) to suppress the version."
else
logtext "Result: option httpd_suppress_version_string configured"
logtext "Output: ${FIND}"
Display --indent 6 --text "- Checking option: httpd_suppress_version_string" --result "FOUND" --color GREEN
AddHP 2 2
fi
fi
#
#################################################################################
#
# Squid
#Hardening:
# $1 $3
# acl snmp_community
# acl maxconn
# acl max_user_ip
#
# follow_x_forwarded_for
#Read cache_peer host type(sibling/parent) proxyport icpport options (if set, icp_access should be set as well)
#Read cache_peer_domain
#Read cache_peer_access
#Read icp_access
#Read icp_port
#Read htcp_access
#Read htcp_port
#Read http_port
#Read https_port
#Read cache_dir
#Read access_log
#Read coredump_dir
#Read quick_abort_min / max /pct
#
# Memory tuning
#Read cache_mem
#Read maximum_object_size_in_memory
#Read maximum_object_size
#Read cache_swap_low
#Read cache_swap_high
# Security
#cache_effective_user
# off
#forwarded_for
#wccp
#
#################################################################################
#
wait_for_keypress
#
#================================================================================
# Lynis - Copyright 2007-2015 Michael Boelen, CISOfy - https://cisofy.com
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