🔗 Filtering Viber Messenger

by Yuri Voinov

🔗 Outline

Viber Messenger is end-to-end encrypted messenger/VoIP/group chats/file transfers application. Using it may be prohibited by corporate security policy.

🔗 Usage

Usually Viber works in most Squid’s setups without any additional configuration. Blocking it, however, require some additional steps. To block Viber, you require SSL Bump-aware squid, or, at least, peek-n-splice configuration.

🔗 Squid Configuration File

Paste the configuration file like this:

# Block Viber
acl deny_viber ssl::server_name_regex .viber\.com
acl DiscoverSNIHost at_step SslBump1
ssl_bump peek DiscoverSNIHost
ssl_bump terminate deny_viber
ssl_bump splice all

then reconfigure Squid.

This is enough to make Viber fully unoperable (both desktop/mobile).

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⚠️ Disclaimer: Any example presented here is provided "as-is" with no support
or guarantee of suitability. If you have any further questions about
these examples please email the squid-users mailing list.

Categories: ConfigExample

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