I have recently setup squid 3.x on my raspberry; And wanted to add some basic authentication
Below, the lines needed to enable it; Once in place you can use this command to add user:
htpasswd -b -c /etc/squid3/passwd username password
example:
htpasswd -b -c /etc/squid3/passwd joe joepassword
auth_param basic program /usr/lib/squid3/ncsa_auth /etc/squid3/passwd auth_param basic children 5 auth_param basic realm Linux Class auth_param basic credentialsttl 2 hours auth_param basic casesensitive off acl mynetwork proxy_auth REQUIRED