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Squid is one of the most popular proxy server which can be employed to run on linux servers.

Let us see how to block accessing certain sites using Squid.

Step 1 » create a file named as ( /etc/squid/blockedsites.squid ) and insert the site names one per line.

Like;

[root@server ~]# cat /etc/squid/blockedsites.squid
 #blocked sites
 www.yahoomail.com
 www.gmail.com

Step 2 » Open the /etc/squid/squid.conf and create a new acl(Access Control  List) ” blocksites” and acl type “dstdomain” in the acl section like the below .

acl Safe_ports port 488         # gss-https
acl Safe_ports port 591         # filemaker
acl Safe_ports port 777         # multiling https
acl CONNECT method CONNECT
# ACL blocksites
acl blocksites dstdomain “/etc/squid/blockedsites.squid”

 

Then add the following line “https_access deny blocksites” to https_section to deny the access to the acl “blocksites” .

 

# Recommended minimum Access Permission configuration:
# Only allow cachemgr access from localhost
https_access allow manager localhost
# Deny access to blocksites ACL
https_access deny blocksites

 

Step 3 » Time to restart squid service

[root@server ~]# service squid restart

 

Restricting Access to specific keywords :

Step 1 » create a file ( /etc/squid/blockkeywords.squid ) and insert the keywords one per line.

[root@server ~]# cat /etc/squid/blockkeywords.squid
#blocked keywords
sex
porn

Step 2 » Open the /etc/squid/squid.conf and create a new acl(Access Control List) “blockkeywords” and acl type “url_regex” in the acl section.

# ACL blocksites

acl blocksites dstdomain “/etc/squid/blockedsites.squid”
# ACL blockkeywords
acl blockkeywords url_regex -i “/etc/squid/blockkeywords.squid”

 

Then insert the following line “https_access deny blockkeywords” to https_section to deny the access to the acl
“blockkeywords” .

 

https_access allow manager localhost
# Deny access to blocksites ACL
https_access deny blocksites
# Deny access to blockkeywords ACL
https_access deny blockkeywords