squid proxy server installation and configuration RHEL7 / Centos7
squid proxy server is used to filter web traffic and reducing and fine tuning internet bandwidth.
Squid was originally developed as the Harvest object cache, part of the Harvest project at the University of Colorado Boulder. Further work on the program was completed at the University of California, San Diego and funded via two grants from the National Science Foundation. Duane Wessels forked the “last pre-commercial version of Harvest” and renamed it to Squid to avoid confusion with the commercial fork called Cached 2.0, which became NetCache. Squid version 1.0.0 was released in July 1996.
Squid is now developed almost exclusively through volunteer efforts.
Squid Proxy Server Profile
- Packages : squid*
- Service Name: squid
- Default port : 3128
- Config File : /etc/squid/squid.conf
- Log file Path: /var/log/squid
- Environment : RHEL 7, Centos 7 and RHEL 6
[root@server ~]# yum install squid* Installed: squid.x86_64 7:3.3.8-12.el7_0 Dependency Installed: libecap.x86_64 0:0.2.0-8.el7 perl-Compress-Raw-Bzip2.x86_64 0:2.061-3.el7 perl-Compress-Raw-Zlib.x86_64 1:2.061-4.el7 perl-DBI.x86_64 0:1.627-4.el7 perl-Data-Dumper.x86_64 0:2.145-3.el7 perl-Digest.noarch 0:1.17-245.el7 perl-Digest-MD5.x86_64 0:2.52-3.el7 perl-IO-Compress.noarch 0:2.061-2.el7 perl-Net-Daemon.noarch 0:0.48-5.el7 perl-PlRPC.noarch 0:0.2020-14.el7 Complete!
Enable and start the Service
[root@server ~]# systemctl enable squid ln -s '/usr/lib/systemd/system/squid.service' '/etc/systemd/system/multi-user.target.wants/squid.service' [root@server ~]# systemctl start squid [root@server ~]# systemctl status squid squid.service - Squid caching proxy Loaded: loaded (/usr/lib/systemd/system/squid.service; enabled) Active: active (running) since Sun 2016-04-17 13:47:33 IST; 34s ago Process: 7989 ExecStart=/usr/sbin/squid $SQUID_OPTS -f $SQUID_CONF (code=exited, status=0/SUCCESS) Process: 7983 ExecStartPre=/usr/libexec/squid/cache_swap.sh (code=exited, status=0/SUCCESS) Main PID: 7999 (squid) CGroup: /system.slice/squid.service ├─7999 /usr/sbin/squid -f /etc/squid/squid.conf └─8001 (squid-1) -f /etc/squid/squid.conf Apr 17 13:46:53 server.arkit.co.in squid: 2016/04/17 13:46:53| WARNING: Could not determine this machines public hostname. Please configure one or set 'visible_hostname'. Apr 17 13:47:13 server.arkit.co.in squid: 2016/04/17 13:47:13| WARNING: Could not determine this machines public hostname. Please configure one or set 'visible_hostname'. Apr 17 13:47:33 server.arkit.co.in squid: 2016/04/17 13:47:33| WARNING: Could not determine this machines public hostname. Please configure one or set 'visible_hostname'. Apr 17 13:47:33 server.arkit.co.in squid: Squid Parent: will start 1 kids Apr 17 13:47:33 server.arkit.co.in squid: Squid Parent: (squid-1) process 8001 started Apr 17 13:47:33 server.arkit.co.in systemd: Started Squid caching proxy.
Allow firewall port for squid
[root@server ~]# firewall-cmd --permanent --add-port=3128/tcp success [root@server ~]# firewall-cmd --reload success
Default port of squid proxy is 3128 that’s why we have to allow port 3128.
Access Control List
Open the configuration file and write the ACL as per requirement in ACL we can do so many things
- Restricting un-wanted (BAD) URL’s
- Restrict access to internet based on time period
- Control Downloads
- Restrict file type downloads
- Allow Networks to enable Internet access
- Download speed control
[root@server ~]# vim /etc/squid/squid.conf
To allow Network we have to write below ACL lines
acl localnet src 192.168.4.0/24 http_access allow localnet
To allow ports using ACL
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 http_access deny !Safe_ports
Block bad sites
acl badsites url_regex "/etc/squid/badsites" http_access deny badsites
write the bad sites in the file
[root@server ~]# cat /etc/squid/badsites .facebook.com .twitter.com .youtube.com .linkedin .msn.com .myspace.com .flickr.com .google
Block File downloads
acl blockfiles urlpath_regex "/etc/squid/blockfiles.acl" http_access deny blockfiles
Block file type downloads, below is the example file to deny mp3, mp4, flv avi, 3gp, mpg and mpeg.
[root@server ~]# cat /etc/squid/blockfiles.acl \.torrent$ \.mp3.*$ \.mp4.*$ \.3gp.*$ \.[Aa][Vv][Ii]$ \.[Mm][Pp][Gg]$ \.[Mm][Pp][Ee][Gg]$ \.[Mm][Pp]3$ \.[Ff][Ll][Vv].*$
Time based access, which deny internet access from morning 10 Hours to 19 Hours
acl work_hours time 10:00-19:00 http_access deny work_hours
restricting download speed ACL
acl speedcontrol src 192.168.4.0/24 delay_pools 1 delay_class 1 2 delay_parameters 1 524288/524288 52428/52428 delay_access 1 allow speedcontrol
Go to Client Side
Change the proxy address in your browser then try to access the website
IE Settings > Internet options > Connections > Lan Settings >
provide IP address and port number
Now see the logs watch the squid logs
/var/log/squid/ log file directory
The logs are a valuable source of information about Squid workloads and performance. The logs record not only access information, but also system configuration errors and resource consumption (eg, memory, disk space). There are several log file maintained by Squid. Some have to be explicitly activated during compile time, others can safely be deactivated during.
- /var/log/squid/access.log : Most log file analysis program are based on the entries in access.log. You can use this file to find out who is using squid server and what they are doing etc
- /var/log/squid/cache.log : The cache.log file contains the debug and error messages that Squid generates. If you start your Squid using the default RunCache script, or start it with the -s command line option, a copy of certain messages will go into your syslog facilities. It is a matter of personal preferences to use a separate file for the squid log data.
- /var/log/squid/store.log : The store.log file covers the objects currently kept on disk or removed ones. As a kind of transaction log it is ususally used for debugging purposes. A definitive statement, whether an object resides on your disks is only possible after analysing the complete log file. The release (deletion) of an object may be logged at a later time than the swap out (save to disk).
HOW DO I VIEW SQUID LOG FILES / LOGS?
You can use standard UNIX / Linux command such as grep / tail to view log files. You must login as root or sudo command to view log files.
Display log files in real time
Use tail command as follows:
~]# tail -f /var/log/squid/access.log OR ~]$ sudo tail -f /var/log/squid/access.log
Search log files
Use grep command as follows:
~]#grep 'string-to-search' /var/log/squid/access.log
That’s about squid proxy server installation and configuration
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