The parent will need to authorization against the child cache's IP address, as if there was no authentication forwarding, and it will need to perform client authentication for all usernames against somepassword via a specially-designed authentication helper. The purpose is to log the client cache's usernames into the parent's access. Is there an easy way of banning all Destination addresses except one? Often, the hardest part about using Squid to deny pornography is coming up with the list of sites that should be blocked.
You may want to maintain such a list yourself, or get one from somewhere else see below. The ACL syntax for using such a list depends on its contents.
The SquidGuard redirector folks have links to some lists. The maintainer of the free ufdbGuard redirector has a commercial URL database. Bill Stearns maintains the sa-blacklist of known spammers.
By blocking the spammer web sites in squid, users can no longer use up bandwidth downloading spam images and html. Even more importantly, they can no longer send out requests for things like scripts and gifs that have a unique identifer attached, showing that they opened the email and making their addresses more valuable to the spammer.
The SleezeBall site has a list of patterns that you can download. The Shalla Secure Services provide a nice downloadable blacklist on free basis with many categories. Note that once you start blocking web content, users will try to use web proxies to circumvent the filtering, hence you will also need to block all web proxies. Squid doesn't match my subdomains If you are using Squid Depending on how your data is ordered this may cause only the most specific of these e.
If your Squid does not warn you while reading the configuration file you do not have the problem described below. Also the configuration here uses the dstdomain syntax of Squid For example, consider this list: acl FOO dstdomain boulder. Any domain name that matches one of the first two will also match the last one co. Ok, but why does this happen? The problem stems from the data structure used to index domain names in an access control list.
Squid uses Splay trees for lists of domain names. This is similar to the way that strcmp works. The problem is that it is wrong to say that co. For example, if you said that co. The bottom line is that you can't have one entry that is a subdomain of another. Squid will warn you if it detects this condition. Why does Squid deny some port numbers? It is dangerous to allow Squid to connect to certain port numbers. To prevent mail relaying, Squid denies requests when the URL port number is Other ports should be blocked as well, as a precaution against other less common attacks.
There are two ways to filter by port number: either allow specific ports, or deny specific ports. By default, Squid does the first. This is the ACL entry that comes in the default squid. Another approach is to deny dangerous ports.
Helpers for LDAP and NT Domain group membership is included in the distribution and it's very easy to write additional helpers to fit your environment. Let's say you have two workstations that should only be allowed access to the Internet during working hours - You can use something like this: acl FOO src These trees require the keys i. Complicated or non-standard netmasks like the For example, change the above to: acl restricted1 src Yes, for some operating systes.
MAC address is only available for clients that are on the same subnet. For Squid Add some arp ACL lines to your squid. For example: acl losers src 1. Note, the maxconn ACL type is kind of tricky because it uses less-than comparison. The ACL is a match when the number of established connections is greater than the value you specify. In Squid There is a difference between. The first matches any domain in foo.
So if you want to deny bar. For example, lets say you want your users to see a special message when they request something that matches your pornography list. That file might contain something like this: Our company policy is to deny requests to known porno sites. Cartoon Underwater Rigged Animated. Elettron Cyborg Male.
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Initial requests are slower because these go through http-gw, http-gw also does reverse lookups. Run a nameserver on the firewall or use an internal nameserver.
Security - X-Forwarded-For When a proxy-cache is used, a server does not see the connection coming from the originating client. Many people like to implement access controls based on the client address. We must note that access controls based on this header are extremely weak and simple to fake.
Anyone may hand-enter a request with any IP address whatsoever. Because of the weakness of this header, access controls based on X-Forwarded-For are not used by default. Yes it can, however the way of doing it has changed from earlier versions of squid. Please follow the instructions for the version of squid that you are using.
As a default, no anonymizing is done. NP: Squid must be built with the --enable-http-violations configure option before building. Current squid releases provide a mix of header control directives and capability; Squid 2. Squid 3. For details see the documentation in squid. For example, if you want Squid to connect directly to hotmail.
Sure, there are few things you can do. You can use the cache access list to make Squid never cache any response: cache deny all With Squid With Squid The directory e. This option controls the largest HTTP message body that will be sent to a cache client for one request.
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