[squid-users] Somewhat OT: Content Filter with https

Marcus Kool marcus.kool at urlfilterdb.com
Wed Jun 8 20:37:15 UTC 2016

On 06/08/2016 05:05 PM, Sergio Belkin wrote:
> Hi,
> I've been using a few years ago squid+dansguardian. But nowadays, DG is not maintained anymore. I know that exists squidGuard, ufdbGuard, and e2guardian.
> Features should be:
> - Blocking https url's

Blocking HTTPS URLs is easy.
However, providing an understandable message to the end user is a challenge.
This is because HTTPS, is designed to not be interfered with, and if a proxy interferes, a browser will display errors like "wrong certificate for this site".
If you want user-friendly error messages like "This site is blocked because ..." instead of the certificate errors,
one needs sslbump with peek+bump for all blocked sites. This is doable but not straightforward.

> - Not need of interception..... is that possible?

It depends.  If you support smartphones, you most likely need interception since not all apps can be configured to use a proxy.
With only desktops, interception is not required but you may need to install the Squid CA certificate on all desktops.

> - Simple for configure  and good perfomance

squidGuard is also not maintained for a long time so not recommendable.
ufdbGuard has regular updates, can be used with free and commercial URL databases, and is 3x faster than squidGuard.

Note that I am the author of ufdbGuard so you may find me biased :-)


> What do you recommend me?
> Thanks in advance!
> --
> --
> Sergio Belkin
> LPIC-2 Certified - http://www.lpi.org

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