[Q.] For security and to save bandwidth I would like to configure Squid proxy server such way that I do not want my users to download all of the following files:
MP3How do I configure squid content filtering?
MPEG
MPG
AVG
AVI
EXE
[A.]You can use squid ACL (access control list) to block all these files easily. First open squid.conf file /etc/squid/squid.conf:
# vi /etc/squid/squid.confNow add following lines to your squid ACL section:
acl blockfiles urlpath_regex "/etc/squid/blocks.files.acl"You want display custom error message when a file is blocked:
# Deny all blocked extension
deny_info ERR_BLOCKED_FILES blockfiles
http_access deny blockfilesSave and close the file.
Create custom error message HTML file called ERR_BLOCKED_FILES in /etc/squid/error/ directory or /usr/share/squid/errors/English directory.
# vi ERR_BLOCKED_FILESAppend following content:
ERROR: Blocked file content
File is blocked due to new IT policy
Please contact helpdesk for more information:
Phone: 555-12435 (ext 44)
Email: helpdesk@yourcorp.com
Now create /etc/squid/blocks.files.acl file:
# vi /etc/squid/blocks.files.acl
Append following text:
Save and close the file. Restart Squid:\.[Ee][Xx][Ee]$
\.[Aa][Vv][Ii]$
\.[Mm][Pp][Gg]$
\.[Mm][Pp][Ee][Gg]$
\.[Mm][Pp]3$
# /etc/init.d/squid restart
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