Hi Over the past month I have been setting up and implementing a Squid3 Setup which uses SSO against Windows DC's, after originally following the excellent guide from http://howtoforge.com/debian-squeeze-squid-kerberos-ldap-authentication-active-directory-integration-and-cyfin-reporter. I then decided to take this one step further and introduce DansGuardian into the loop for Content Filtering. The Setup Iam working with is SquidProxy->DG->SquidProxy. The First is Squid to Authorise against AD and listen on Port 8080, then pass onto DG for Content Filtering on Port 8081, and then DG to pass back to the original single instance of Squid running back to Port 3128. This does work very well, but after studying some logs I don't think much is being pulled from the Squid Cache, most of my squid access.log is like this --- 1311675442.422 228 localhost TCP_MISS/200 2093 GET http://static.howtoforge.com/images/teaser/ubuntu.gif - DIRECT/178.63.27.110 image/gif 1311675442.423 268 192.168.22.107 TCP_MISS/200 2499 GET http://static.howtoforge.com/images/teaser/ubuntu.gif user@MY.LOCAL FIRST_UP_PARENT/127.0.0.1 image/gif 1311675442.473 134 localhost TCP_MISS/200 4103 GET http://static.howtoforge.com/themes/htf_glass/images/star_vmware_image_red.png - DIRECT/178.63.27.110 image/png 1311675442.473 166 192.168.22.107 TCP_MISS/200 4509 GET http://static.howtoforge.com/themes/htf_glass/images/star_vmware_image_red.png user@MY.LOCAL FIRST_UP_PARENT/127.0.0.1 image/png 1311675442.540 131 localhost TCP_MISS/200 1313 GET http://howtoforge.com/themes/htf_glass/images/next_page.gif - DIRECT/188.40.16.205 image/gif 1311675442.540 161 192.168.22.107 TCP_MISS/200 1719 GET http://howtoforge.com/themes/htf_glass/images/next_page.gif user@MY.LOCAL FIRST_UP_PARENT/127.0.0.1 image/gif --- And the corresponding DG access.log shows --- 2011.7.26 11:17:18 user@my.local 192.168.22.107 http://howtoforge.com *SCANNED* GET 63490 -320 1 200 text/html -v --- Also in my cache.log I have spotted on almost all website's iam getting this "WARNING: Forwarding loop detected for:" :- --- 2011/07/26 11:11:51| WARNING: Forwarding loop detected for: GET /debian-squeeze-squid-kerberos-ldap-authentication-active-directory-integration-and-cyfin-reporter HTTP/1.0 Host: howtoforge.com User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0) Gecko/20100101 Firefox/5.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-gb,en;q=0.5 Accept-Encoding: identity,gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Cookie: __utma=267335345347.234535641.13353454396.13105635345345.133534530396.1; __utmz=233530247.13353453396.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none) Via: 1.1 squid.my.local (squid/3.1.14) X-Forwarded-For: 192.168.22.107 Proxy-Authorization: Basic YW1yQFRHsdfsfasasdhfdfgk Cache-Control: max-age=259200 Connection: keep-alive X-Forwarded-For: 192.168.22.107 --- Is their anything incorrect or need adding/changing to my squid.conf so I can get squid to get a better hit rate with the Cache stored & also to remove the "WARNING: Forwarding loop detected for" message in my cache.log. Would I need to setup 2 separate squid instances instead of Squid1->DG->Squid2 instead? If I do, how would I need to alter my current squid.conf into 2 separate files? My squid.conf --- ####### /etc/squid3/squid.conf Configuration File ####### ####### cache manager cache_mgr squid@xxxxxxxxxxxxxxx ####### kerberos authentication auth_param negotiate program /usr/lib/squid3/squid_kerb_auth -d -s HTTP/proxy.my.local auth_param negotiate children 10 auth_param negotiate keep_alive on ####### provide access via ldap for clients not authenticated via kerberos auth_param basic program /usr/lib/squid3/squid_ldap_auth -R \ -b "dc=my,dc=local" \ -D squid@my.local \ -w "password" \ -f sAMAccountName=%s \ -h dc.my.local auth_param basic children 10 auth_param basic realm Internet Proxy auth_param basic credentialsttl 1 minute ####### ldap authorizations # restricted proxy access logged external_acl_type internet_users %LOGIN /usr/lib/squid3/squid_ldap_group -R -K \ -b "dc=my,dc=local" \ -D squid@my.local \ -w "password" \ -f "(&(objectclass=person)(sAMAccountName=%v)(memberof=cn=Internet Users,ou=Internet Groups,dc=my,dc=local))" \ -h dc.tg.local # full proxy access no logging external_acl_type internet_users_full_nolog %LOGIN /usr/lib/squid3/squid_ldap_group -R -K \ -b "dc=my,dc=local" \ -D squid@my.local \ -w "password" \ -f "(&(objectclass=person)(sAMAccountName=%v)(memberof=cn=Internet Users Full NoLog,ou=Internet Groups,dc=my,dc=local))" \ -h dc.tg.local # full proxy access logged external_acl_type internet_users_full_log %LOGIN /usr/lib/squid3/squid_ldap_group -R -K \ -b "dc=my,dc=local" \ -D squid@my.local \ -w "password" \ -f "(&(objectclass=person)(sAMAccountName=%v)(memberof=cn=Internet Users Full Log,ou=Internet Groups,dc=my,dc=local))" \ -h dc.tg.local ####### acl for proxy auth and ldap authorizations acl auth proxy_auth REQUIRED # format "acl, aclname, acltype, acltypename, activedirectorygroup" acl RestrictedAccessLog external internet_users Internet\ Users acl FullAccessNoLog external internet_users_full_nolog Internet\ Users\ Full\ NoLog acl FullAccessLog external internet_users_full_log Internet\ Users\ Full\ Log acl whitelistsites url_regex -i "/etc/squid3/whitelistsites.txt" acl blockedsites url_regex -i "/etc/squid3/blockedsites.txt" ####### squid defaults acl manager proto cache_object acl localhost src 127.0.0.1/32 ::1 acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1 acl SSL_ports port 443 acl Safe_ports port 80-81 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 # https 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 CONNECT method CONNECT http_access allow manager localhost http_access deny manager http_access deny !Safe_ports http_access deny CONNECT !SSL_ports http_access allow localhost ####### enforce auth: order of rules is important for authorization levels no_cache deny whitelistsites http_access allow whitelistsites http_access allow FullAccessNoLog auth http_access allow FullAccessLog auth http_access deny blockedsites http_access allow RestrictedAccessLog auth ####### logging # don't log FullAccessNoLog access_log /var/log/squid3/access.log squid !FullAccessNoLog ####### squid defaults http_access deny all #Log Connecting Client DNS Names instead on IP Names. log_fqdn on http_port 127.0.0.1:3128 http_port 8080 ##Push Traffic Through DansGuradian for Content Filtering cache_peer 127.0.0.1 parent 8081 0 no-query proxy-only no-delay no-netdb-exchange no-digest connect-timeout=15 login=*:password ##Restrict cache_peer_access to only authenticated users currently from RestrictedAccessLog acl group (ie "internet users" ad group, all non users of the group ##FullInteret Users UnFiltered will only go through Squid & will not go through Dansguardian). cache_peer_access 127.0.0.1 allow RestrictedAccessLog cache_peer_access 127.0.0.1 deny all hierarchy_stoplist cgi-bin ? coredump_dir /var/spool/squid3 refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 refresh_pattern . 0 20% 4320 --- Many thanks in advance Andy
