We’ll be using the pam_auth module. This will allow anyone who has a shell account to also be able to use the Squid server. Search for the auth_param section in the config and add these lines:
auth_param basic program /usr/lib/squid/pam_auth
auth_param basic children 5
auth_param basic realm Squid proxy-caching web server
auth_param basic credentialsttl 2 hours
Next search for this line and uncomment it:
acl password proxy_auth REQUIRED
Now create a pam module called /etc/pam.d/squid that contains:
auth required /lib/security/pam_unix.so
account required /lib/security/pam_unix.so
Restart the squid and you are done.
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source:http://linuxpoison.blogspot.com/2007/10/13578175807947.html