Squid

pkg install squid
pkg install htdigest
sysrc squid_enable="YES"

There are two ways to specify the password auth, htdigest or htpasswd.

htdigest

/usr/local/etc/squid/squid.conf

auth_param basic program /usr/local/libexec/squid/basic_ncsa_auth /usr/local/etc/squid/password
auth_param basic realm proxy
auth_param basic casesensitive

apache-htdigest -c /usr/local/etc/squid/password realm username
# or htdigest if apache-htdigest is not found

php -a
echo 'user': . crypt('password', base64_encode('password'));

htpasswd

/usr/local/etc/squid/squid.conf

auth_param digest realm proxy
auth_param digest program /usr/local/libexec/squid/digest_file_auth -c /usr/local/etc/squid/password

htpasswd -c /usr/local/etc/squid/password username

/usr/local/etc/squid/squid.conf

acl users proxy_auth REQUIRED
acl ncku src 140.116.0.0/16
http_access deny !ncku
http_access allow users
http_port 3128

squid -f /usr/local/etc/squid/squid.conf -k parse

service squid start