Hi,
I wondered whether I could have an eyeball on my squid.conf. It's very basic regarding access rules as there is a proxy filter further up chain - also I'm not caching. The main purpose is to ensure that where not explicitly allowed via ACL all traffic passes through the squid proxy and heads upstream. I also block on direct HTTP/S access from a client; only the proxy has access out. How does it look, I welcome any suggestions, inclusions or (importantly) glaring errors or omissions! Obviously, I appreciate there is a lot that one might allow like blocking Yahoo Messenger but I guess I'm after glaring errors!
Thanks in advance,
Nick
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http_port proxy1:8080
auth_param negotiate program /usr/lib/squid/squid_kerb_auth -r
auth_param negotiate children 10
auth_param negotiate keep_alive on
auth_param ntlm program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp
auth_param ntlm children 40
auth_param basic program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-basic
auth_param basic children 5
auth_param basic realm Squid proxy-caching web server
auth_param basic credentialsttl 2 hours
cache_peer [upstreamproxy] parent 8080 0 no-query proxy-only no-digest default
cache_mgr helpdesk@xxxxxxxxxxxx
visible_hostname proxy1.{fqdn}
######### ICAP SERVER #########
icap_enable on
icap_preview_enable on
icap_persistent_connections on
icap_send_client_ip on
icap_send_client_username on
icap_client_username_header X-Authenticated-User
icap_client_username_encode on
icap_service ss reqmod_precache 0 icap://localhost/ssreqmod
icap_class c1 ss
icap_access c1 allow all
###### LOGGING OPTIONS ########
## LOGGING SWITCHES
log_fqdn on
## LOG LOCATIONS
access_log /var/log/squid/access.log squid
cache_log /var/log/squid/cache.log squid
useragent_log /var/log/squid/useragent.log squid
###### Delay Pool Definitions #######
# Total number of delay pools
delay_pools 1
#### ACCESS CONTROL LISTS #####
## USER-AGENT (Browser-type) ACLs
acl Java_jvm browser "/etc/squid/ACL/USERAGENTS/USER-AGENTS_JAVA.txt"
acl iTunes browser "/etc/squid/ACL/USERAGENTS/USER-AGENTS_APPLE.txt"
acl MSNMessenger browser "/etc/squid/ACL/USERAGENTS/USER-AGENTS_MSN.txt"
## USER AUTHENTICATION ACLs
acl AuthenticatedUsers proxy_auth REQUIRED
## LAN IP ACLs
acl 172SUBNETS src 172.16.0.0/255.255.0.0
acl SERVERSUBNETS src 172.16.10.0/255.255.255.0
# Blocks CONNECT method to IP addresses (Blocks Skype amongst other things)
acl StopDirectIP url_regex ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+
## SEND DIRECT ACLs
acl SENDDIRECT_DstDomains dstdomain "/etc/squid/ACL/SENDDIRECT/SENDDIRECT_DSTDOMAINS.txt"
acl SENDDIRECT_IPAddresses src "/etc/squid/ACL/SENDDIRECT/SENDDIRECT_IPADDRESSES.txt"
# CONNECT Method Direct IP ACLs
acl IP_CONNECTALLOW src "/etc/squid/ACL/IPADDRESSES/IP_CONNECTALLOW.txt"
## LOCALHOST ACLs
acl localhost src 127.0.0.1/255.255.255.255
acl to_localhost dst 127.0.0.0/8
## QUERY ACLs
acl QUERY urlpath_regex cgi-bin \?
acl apache rep_header Server ^Apache
## PORTS ACLs
acl SSL_ports port 443
acl Safe_ports port 80 # http
acl Safe_ports port 8080 # http
acl Safe_ports port 21 # ftp
acl Safe_ports port 443 # https
acl Safe_ports port 70 # gopher
acl Safe_ports port 70 # gopher
acl Safe_ports port 210 # wais
acl Safe_ports port 1025-65535 # unregistered ports
acl Safe_ports port 280 # http-mgmt
acl Safe_ports port 488 # gss-http
acl Safe_ports port 591 # filemaker
acl Safe_ports port 777 # multiling http
acl RTMP_ports port 1935 # RTMP
# CONNECTION METHOD ACL
acl CONNECT method CONNECT
acl POST method POST
###### ACCESS RULES #####
## GLOBAL DENY RULES - Do NOT include User Authentication ACLs here
http_access deny StopDirectIP !IP_CONNECTALLOW
http_access deny MSNMessenger 172SUBNETS
http_access allow POST 172SUBNETS
http_access allow CONNECT 172SUBNETS
# USER AGENTS ALLOW #
http_access allow iTunes 172SUBNETS
http_access allow Java_jvm 172SUBNETS
## USERS AUTHENTICATION##
http_access allow AuthenticatedUsers
http_reply_access allow AuthenticatedUsers
## SEND DIRECT ALLOW
always_direct allow SENDDIRECT_DstDomains
always_direct allow SENDDIRECT_IPAddresses
## LOCAL HOST ALLOW ##
http_access allow localhost
###### DELAY ACCESS RULES ######
# First delay class pool is User allocated
delay_class 1 4
# First delay class pool is limited to 4mb i.e. all users not in exceptions: SERVERSUBNETS
delay_parameters 1 -1/-1 -1/-1 -1/-1 4000000/4000000
#First delay pool applied to Authenticated users except those in Server Subnet
delay_access 1 allow AuthenticatedUsers !SERVERSUBNETS
delay_access 1 deny all
###### DENY ######
always_direct deny all
never_direct allow all
snmp_access deny all
cache deny all
http_access deny all
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