Squid acl file example

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. Can be anything.

The possible types include the requesting clients address, the Web server address or host name, a regular expression matching the URL , and many more. The file should contain one item per line. Matching done based on clients IP address.

Same as src but looks for destination IP Address. The local IP address on which the client connection exists. Ethernet MAC address matching. Build Option: -enable-arp-acl This option only works for clients on the same local subnet, and only for certain platforms: Linux. If the client is on a different subnet, then Squid cannot find out its MAC address.

Matches against the client domain name. NOTE: If a path to a file, it must be surrounded by parentheses. This refers to destination domain. NOTE: If a path to a file is specified, it must be surrounded by parentheses. Matching done on destination domain based on regular expression. If the words are found it will match.

Regular Expression matching on URL login field. Matching done on the destination port. This provides match against local socket TCP interface port. Icons from Silk collection by Mark James of famfamfam.

Squid configuration directive acl Available in: v6 v5 v4 3. Suggested Config: Recommended minimum configuration: Example rule allowing access from your local networks.

Adapt to list your internal IP networks from where browsing should be allowed Defining an Access List Every access list definition must begin with an aclname and acltype, followed by either type-specific arguments or a quoted filename that they are read from. When using "file", the file should contain one item per line. To make them case-insensitive, use the -i option. If lookup or conversion is required because the parameter type IP or domain name does not match the message address type domain name or IP , then the ACL would immediately declare a mismatch without any warnings or lookups.

The optional "delimiters" parameter specifies one or more alternative non-alphanumeric delimiter characters. Those which do are marked with the tag [slow], those which don't are marked as [fast]. The 'arp' ACL code is not portable to all operating systems. If the client is on a different subnet, then Squid cannot find out its address.

IPv6 protocol does not contain ARP. If multiple marks are given, then the ACL matches if at least one mark matches. But luckily you can define your own custom error pages and display them when you deny certain accesses. A simple example:. If the user tries to access www. This will deny access only for the user from the IP address As you can see I have combined the ACLs admin and google. The user has to close and re-open the browser windows to be able to re-login at the proxy. A simple configuration will probably look like this:.

Now there is a tricky change that was introduced in Squid 2. It allows to control when the user is prompted to authenticate. Example configuration:. In this case if the user requests www. If the matching ACL has to do with authentication a re-authentication is triggered.

You might also run into an authentication loop if you are not careful. This config is likely wrong for you:. This is perhaps not what you want.

You rather wanted to deny access to non-members. This is the correct example:. Since dummy is a static ACL that always matches and has nothing to do with authentication you will find that the access is just denied. I downloaded a definition of list in squidblacklist. One of the example I download is squid-torrent. This is my squid. Help, how to fix this error, I like using a list of definition, because its easy for me to download from the web for the list, instead of searching all torrent site and add-in to my blockesite list.

After, checking and removing the duplicate of acl list in my squid-torrent. Access control configuration prevents your request from being allowed at this time. Please contact your service provider if you feel this is incorrect.

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