[squid-users] Host header forgery affects pure splice environment too?
Jason_Haar at trimble.com
Mon Dec 28 03:33:22 UTC 2015
On 28/12/15 14:34, Amos Jeffries wrote:
> Removing the redirect of tcp/443 totally fixes the problem.
> What redirect ?
tcp/443 redirect - sorry bad choice of words (really iptables REDIRECT).
ie TOR starts working if it isn't going through squid (which I
appreciate doesn't add much to this conversation - but it does prove
it's not some generic firewall/network problem)
> Well, Squid should not get to the point of testing Host name in the HTTP
> messages. SNI is mandatory to contain a resolvable FQDN. Not doing so is
> a TLS protocol violation and Squid should just abort down to either
> terminate or blindly tunnel based on your on_unknown_protocol settings.
Ooh - I haven't heard of "on_unknown_protocol"? I don't see it in the
squid.conf.documented that comes with squid-3.5.10?
That sounds exactly what's needed. What we have here is a situation
where a "bogus" application is routing through tcp/443 - which we choose
to do transparent TLS intercept on. What I want is to use peek/splice to
improve our logging - but otherwise not fiddle with any application that
happens to run over tcp/443.
I did find "on_unsupported_protocol" - so added
"on_unsupported_protocol tunnel SSL_https" (acl SSL_https port 443) -
but that triggered a squid-3.5.10 config error? Is this a new squid-4
> if you want to dig into this further I suggest getting a
> "debug_options ALL,9" output and looking at what cache.log says about
> the state of the request that is being checked and failing.
I think we know what the problem is: TOR is making TLS connections (I
don't know if they're HTTPS) on port 443 and uses SNI names that aren't
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