gate# cat /etc/squid/deny_hosts.txt

ok\.ru
vk\.com

gate# cat /etc/squid/permit_hosts.txt

microsoft\.com

gate# cat /etc/squid/squid.conf

...
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
#
acl our_networks src 192.168.X.0/24
acl our_pppoe_networks src 192.168.100+X.0/24
acl big_boss src 192.168.113.100 192.168.100+X.101

acl deny_hosts url_regex "/etc/squid/deny_hosts.txt"
acl permit_hosts url_regex "/etc/squid/permit_hosts.txt"

# order is important
http_access allow big_boss
http_access allow our_pppoe_networks !deny_hosts
http_access allow our_networks permit_hosts
...

gate# squid -k check

gate# squid -k reconfigure

gate# cat /etc/squid/conf.d/my.conf

...
#acl inetuser proxy_auth REQUIRED
#acl inetuser proxy_auth user1@CORP13.UN user2@CORP13.UN
acl inetuser proxy_auth_regex "/etc/squid/group1.acl"

http_access allow inetuser

gate# getent group group1 | cut -f4 -d: | tr "," "\n" | tee /etc/squid/group1.acl

gate# squid -k reconfigure

gate# ntlm_auth --username=user1 --require-membership-of=CORPX\\group1