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Drawing DataMatrix in Font SETTING UP WEB SERVICES

CHAPTER 11 SETTING UP WEB SERVICES
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Caution When creating Squid access rules, you should never forget that when a rule applies, Squid executes it for the user in question, and other rules are not looked at any more. Therefore, always write your rules from very specific to more general rules.
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In the previous example, the ACL was based on the source IP address. Many other criteria can also be used in an ACL: src: This type refers to the source address of a node. An individual IP address can be used, a range of IP addresses can be used, or a complete subnet mask can be used. An example of a range specified as the source address is 192.168.1.10 192.168.1.20/32. Note the 32-bit subnet mask, which is always needed if a range is specified. dst: This type refers to the destination IP address. It is not very useful to use this type to refer to addresses on the Internet because they can change without notice. If access has to be denied for users from the private network to a host in the DMZ, however, this type can be useful. An example is provided in the following listing: acl protected_host dst 10.0.0.10/32 acl private_network src 10.0.10.0/24 http_access deny proteted_host private_network srcdomain: Like source, but refers to a DNS domain as source. dstdomain: Like dst, but based on a DNS domain name. time: This type refers to the time of day and day of the week when a tag should be used. (The day of the week can also be used, but it is not necessary.) The following are valid examples of using the time ACL type: acl toolate time 20:00-6:00 acl weekend time A-S 0:01-24:00 acl notonfriday time F 16:00-24:00 If referring to the days of the week, the following can be used: Monday: M Tuesday: T Wednesday: W Thursday: H Friday: F Saturday: A Sunday: S
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CHAPTER 11 SETTING UP WEB SERVICES
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url_regexp: This type looks for a regular expression in an URL. For example, you can use acl sex url_regex "sex" to deny access to all sites that have sex somewhere in the URL. This ACL often has unexpected results because other sites can be blocked. (For instance, it blocks access to www.essex.co.uk, which is a perfectly legitimate site.) port: This type blocks access on given ports. proto: This type blocks access to specified protocols only. reg_mime_type: This very useful type blocks access to specific file types. The type of file is determined by looking at the mime type. For example, think of an ACL as acl mp3 reg_mime_type "audio/mpeg". After specifying the ACLs, it s time to define http_access tags that use the ACL. Although you can refer to one ACL in an http_access tag, more than one ACL can be referred to as well. (An example of this was shown in http_access deny protected_host private_network, which denied traffic coming from the private network and going to a protected host.) It s also possible to use exclusion in an ACL for example in http_access deny protected_host !private_network which denies access to the protected host to all hosts not coming from private network access. Remember that no matter how complex the applied ACLs can be, you should always conclude the list of ACLs with a default policy. The policy defines what should happen if no specific match is found for a given package. In general, it is useful to conclude the list of http_access tags with http_access deny all to deny access to all packets that have not matched a specific http_access tag earlier in the chain.
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Configuring User Authentication
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Besides analyzing the packet (where it comes from and where it goes to), you can also use user authentication with Squid. The only thing necessary to make user authentication work is the use of a browser that supports user authentication (all current browsers do.) In a Squid environment, the browser and the proxy can exchange user name and password in three ways: Basic Digest NTLM In the Basic method, the user name and password are sent in clear text to the proxy. The Digest method does not send the password in clear text; it uses a digest derived from the password instead. The advantage is that the password cannot be read while being sent from the browser of the user to the proxy. The NTLM method can also be used, but it is not a part of the HTTP protocol specifications. Therefore, you might encounter browsers in which this method is not supported.
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Note Unfortunately, the Digest method was not implemented in the current version of Squid, so this section discusses only how the Basic authentication method is used.
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