So, is there no way to redirect bad https links to a meaningful page as with http ??
not really, as such kinds of redirections is precisely what a we are trying to avoid
by validating DNSSEC, enforcing HTTPS across all places and prevent downgrades to HTTP.
In places I have worked the 404 page took customers to a help page with links to contact numbers/customer service/etc.
Since IPFire’s web proxy is not able to intercept HTTPS/TLS connections for security
reasons (as discussed here), I am afraid you cannot display a custom
error page to your users if they are trying to reach HTTPS destinations.
That strikes me as something of a backward step.
It depends. Intercepting TLS looks like a MITM attack to clients (and servers, if they
notice TLS behaviours of their clients closely enough), opening up a huge abuse vector.
Further, it requires additional code to be executed on IPFire (currently, the Squid proxy
is compiled without SSL/TLS support), processing untrusted data.
Ultimately, adding support for this causes more security trouble than it solves.
If you want to run such a setup - I happen to administer them in professional environments -,
building dedicated server farms with secure CA storage is a better idea anyway, which goes
beyond the job of a firewall distribution.
Thanks, and best regards,