How to Install and Configure Squid Server in CentOS 6.5

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Squid proxy :

Squid is a proxy server for caching and filtering web content . Squid proxy is used by various organisation and internet providers to reduce bandwidth and to increase response time .Squid proxy service will cache the requested web-content and re-using it for the further request of the same content .

[root@ansh ~]# yum update

By default squid configuration file “/etc/squid/squid.conf” will contains recommended minimum configuration  and squid caching feature will work without making any changes . Recommended minimum configuration will looks like the below

#
# Recommended minimum configuration:
#
acl manager proto cache_object
acl localhost src 127.0.0.1/32 ::1
acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1
# Example rule allowing access from your local networks.
# Adapt to list your (internal) IP networks from where browsing
# should be allowed
acl localnet src 10.0.0.0/8     # RFC1918 possible internal network
acl localnet src 172.16.0.0/12  # RFC1918 possible internal network
acl localnet src 192.168.0.0/24 # RFC1918 possible internal network
acl localnet src fc00::/7       # RFC 4193 local private network range
acl localnet src fe80::/10      # RFC 4291 link-local (directly plugged) machines
acl SSL_ports port 443
acl Safe_ports port 80          # http
acl Safe_ports port 21          # ftp
acl Safe_ports port 443         # https
acl Safe_ports port 70          # gopher
acl Safe_ports port 210         # wais
acl Safe_ports port 1025-65535  # unregistered ports
acl Safe_ports port 280         # http-mgmt
acl Safe_ports port 488         # gss-http
acl Safe_ports port 591         # filemaker
acl Safe_ports port 777         # multiling http
acl CONNECT method CONNECT
#
# Recommended minimum Access Permission configuration:
#
# Only allow cachemgr access from localhost
http_access allow manager localhost
http_access deny manager
# Deny requests to certain unsafe ports
http_access deny !Safe_ports
# Deny CONNECT to other than secure SSL ports
http_access deny CONNECT !SSL_ports
# We strongly recommend the following be uncommented to protect innocent
# web applications running on the proxy server who think the only
# one who can access services on "localhost" is a local user
#http_access deny to_localhost
#
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
#
# Example rule allowing access from your local networks.
# Adapt localnet in the ACL section to list your (internal) IP networks
# from where browsing should be allowed
http_access allow localnet
http_access allow localhost
# And finally deny all other access to this proxy
http_access deny all
# Squid normally listens to port 3128
http_port 3128
# We recommend you to use at least the following line.
hierarchy_stoplist cgi-bin ?
# Uncomment and adjust the following to add a disk cache directory.
#cache_dir ufs /var/spool/squid 100 16 256
# Leave coredumps in the first cache dir
coredump_dir /var/spool/squid
# Add any of your own refresh_pattern entries above these.
refresh_pattern ^ftp:           1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
refresh_pattern -i (/cgi-bin/|\?) 0     0%      0
refresh_pattern .               0       20%     4320


Step 2» Now start squid service

[root@ansh ~]# service squid start

and type this below command to start squid service automatically while booting.

[root@ansh ~]# chkconfig --levels 235 squid on

Step 3 » Setup your web browser to access Internet through proxy server on port 3128 .

IE : Tools » Internet options »Connections » LAN settings » Choose “Use a proxy server for your LAN” » Type your Proxy server ip (192.168.0.150) and port no 3128

Firefox : Options / Preferences » Advanced » Network » Settings » Choose “Manual proxy configuration ” » Type your Proxy server ip (192.168.0.150 ) and port no 3128

Step 4 » Browse some sites and check the access log file on proxy server

[root@ansh ~]# tail -f /var/log/squid/access.log

Restricting Access to specific web sites :

For example , we can see how to block facebook.com and gmail.com .
Step 1 » create a file ( /etc/squid/blockedsites.squid ) and add the site names one per line.

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

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

acl Safe_ports port 488         # gss-http
acl Safe_ports port 591         # filemaker
acl Safe_ports port 777         # multiling http
acl CONNECT method CONNECT
# ACL blocksites
acl blocksites dstdomain "/etc/squid/blockedsites.squid"
and add the following line “http_access deny blocksites” to http_section to deny the access to the acl “blocksites” .
# Recommended minimum Access Permission configuration:
#
# Only allow cachemgr access from localhost
http_access allow manager localhost
# Deny access to blocksites ACL
http_access deny blocksites
Step 3 » Now restart squid service
[root@ansh ~]# service squid restart


Step 4 » Try to access facebook.com in your browser . you could see the blocked page as below .


squid proxy server block


OK... Enjoy All of you...

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