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acl mylan src 19216800/2552552550 http_access allow mylan
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TIP Web clients that need to access your Squid server as a standard proxy cache will need to know
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the server s address and the port for Squid s HTTP services, by default 3128
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The squidconf File
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The Squid configuration file is squidconf, located in the /etc/squid directory In the /etc/ squid/squidconf file, you set general options such as ports used, security options controlling access to the server, and cache options for configuring caching operations You can use a backup version called /etc/squid/squidconfdefault to restore your original defaults The default version of squidconf provided with Squid software includes detailed
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explanations of all standard entries, along with commented default entries Entries consist of tags that specify different attributes For example, maximum_object_size and maximum_object set limits on objects transferred
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As a proxy, Squid will use certain ports for specific services, such as port 3128 for HTTP services like web browsers Default port numbers are already set for Squid Should you need to use other ports, you can set them in the /etc/squid/squidconf file The following entry shows how you set the web browser port:
http_port 3128
NOTE Squid uses the Simple Network Management Protocol (SNMP) to provide status
information and statistics to SNMP agents managing your network You can control SNMP with the snmp access and port configurations in the squidconf file
Security
Squid can use its role as an intermediary between web clients and a web server to implement access controls, determining who can access the web server and how Squid does this by checking the access control lists (ACLs) of hosts and domains that have had controls placed on them When it finds a web client from one of those hosts attempting to connect to the web server, it executes the control Squid supports a number of controls with which it can deny or allow access to the web server by the remote host s web client (see Table 24-2) In effect, Squid sets up a firewall just for the web server The first step in configuring Squid security is to create ACLs These are lists of hosts and domains for which you want to set up controls You define ACLs using the acl command, creating 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, by use of several acl options, such as the source IP address, the domain name, or even the time and date 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 19216800 through 1921680255, use the following ACL definition:
acl mylan src 19216800/2552552550
Once it is defined, you can use an ACL definition 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 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:
http_access allow mylan
By defining ACLs and using them in Squid options, you can tailor your website 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
24:
Proxy Servers
Option src ip-address/netmask src addr1-addr2/netmask dst ip-address/netmask myip ip-address/netmask srcdomain domain dstdomain domain
Description Client IP address 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 A specific port or range of ports A specific protocol, such as HTTP or FTP Specific 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
srcdom_regex [-i] expression dstdom_regex [-i] expression time [day-abbrevs] [h1:m1-h2:m2]
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 TABLE 24-2 Squid ACL Options
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
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