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Option src addr1-addr2/netmask dst ip-address/netmask myip ip-address/netmask srcdomain domain dstdomain domain
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Table 27-3: Squid ACL Options Description Range of addresses Destination IP address Local socket IP address Reverse lookup, client IP Destination server from URL; for dstdomain and dstdom_regex, a reverse lookup is tried if an IPbased URL is used Regular expression matching client name Regular expression matching destination Time as specified by day, hour, and minutes. Day abbreviations: S - Sunday, M - Monday, T Tuesday, W - Wednesday, H - Thursday, F - Friday, A - Saturday Regular expression matching on whole URL Regular expression matching on URL path Specify a port or range of ports Specify a protocol, such as HTTP or FTP Specify methods, such as GET and POST Pattern match on user-agent header String match on ident output Used for routing of requests to specific caches Used for routing of requests to specific caches List of valid usernames A community string to limit access to your SNMP agent
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srcdom_regex [-i] expression dstdom_regex [-i] expression time [day-abbrevs] [h1:m1-h2:m2]
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url_regex [-i] expression urlpath_regex [-i] expression port ports proto protocol method method browser [-i] regexp ident username src_as number dst_as number proxy_auth username snmp_community string
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The first step in configuring Squid security is to create ACLs. These lists are lists of hosts and domains for which you want to set up control. You define ACLs using the acl command, in which you create a label for the systems on which you are setting controls. You then use commands, such as http_access, to define these controls. You can define a system, or a group of systems, based on several acl options, such as the source IP address, the domain name, or even the time and date (refer back to Table 27-2). For example, the src option is used to define a system or group of systems with a certain source address. To define a mylan acl entry for systems in a local network with the addresses 192.168.0.0 through 192.168.0.255, use the following ACL definition:
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Once defined, an ACL definition can be used in a Squid option to specify a control you want to place on those systems. For example, to allow access by the mylan group of local systems
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to the Web through the proxy, use an http_access option with the allow action specifying mylan as the acl definition to use, as shown here:
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By defining ACLs and using them in Squid options, you can tailor your Web site with the kind of security you want. The following example allows access to the Web through the proxy by only the mylan group of local systems, denying access to all others. Two acl entries are set up: one for the local system and one for all others. http_access options first allow access to the local system, and then deny access to all others.
acl mylan src 192.168.0.0/255.255.255.0 acl all src 0.0.0.0/0.0.0.0 http_access allow mylan http_access deny all
The default entries that you will find in your squid.conf file, along with an entry for the mylan sample network, are shown here. You will find these entries in the ACCESS CONTROLS section of the squid.conf file.
acl acl acl acl acl all src 0.0.0.0/0.0.0.0 manager proto cache_object localhost src 127.0.0.1/255.255.255.255 mylan src 192.168.0.0/255.255.255.0 SSL_ports port 443 563
The order of the http_access options is important. Squid starts from the first and works its way down, stopping at the first http_access option with an ACL entry that matches. In the previous example, local systems that match the first http_access command are allowed, whereas others fall through to the second http_access command and are denied. For systems using the proxy, you can also control what sites they can access. For a destination address, you create an acl entry with the dst qualifier. The dst qualifier takes as its argument the site address. Then you can create an http_access option to control access to that address. The following example denies access by anyone using the proxy to the destination site rabbit.mytrek.com. If you have a local network accessing the Web through the proxy, you can use such commands to restrict access to certain sites.
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