[squid-users] intercepting tcp/443 purely for logging purposes

[Vito A. Smaldino]

Hi all,
great, i'm just searching for this. Jason can you kindly post the whole
squid.conf?
Thanks
V

2016-03-20 22:29 GMT+01:00 Jason Haar <jason_haar at trimble.com>:

> Hi there
>
> I'm wanting to use tls intercept to just log (well OK, and potentially
> block) HTTPS sites based on hostnames (from SNI), but have had problems
> even in peek-and-splice mode. So I'm willing to compromise and instead just
> intercept that traffic, log it, block on IP addresses if need be, and don't
> use ssl-bump beyond that.
>
> So far the following seems to work perfectly, can someone confirm this is
> "supported" - ie that I'm not relying on some bug that might get fixed
> later? ;-)
>
> sslcrtd_program /usr/lib64/squid/ssl_crtd -s /var/lib/squid/ssl_db -M 256MB
> sslcrtd_children 32 startup=15 idle=5
> acl SSL_https port 443
> ssl_bump splice SSL_https
> acl BlacklistedHTTPSsites dstdomain
> "/etc/squid/acl-BlacklistedHTTPSsites.txt"
> http_access deny BlacklistedHTTPSsites
>
> The "bug" comment comes down to how acl seems to work. I half-expected the
> above not to work - but it does. It would appear squid will treat an
> intercept's dst IP as the "dns name" as that's all it's got - so
> "dstdomain" works fine for both CONNECT and intercept IFF the acl contains
> IP addresses
>
> I was hoping I wouldn't need ssl-bump at all, but you need squid to be
> running a https_port, and for it to support "intercept", and to do that
> squid insists on "ssl-bump" too - although that seems likely was a
> programmer assumption that didn't include people like me doing mad things
> like this? :-). I'd also guess I don't need 32 children/etc  - 1 would
> suffice as it's never used?
>
> So the end result is that all CONNECT and/or intercept SSL/TLS traffic is
> supported via the proxy, with all TLS security decisions residing on the
> client. I get my logs, and if I want to block some known bad IP address, I
> can: CONNECT causes a 403 HTTP error page and intercept basically ditches
> the tcp/443 connection - which is as good as it gets without getting into
> the wonderful world of real "bump"
>
> --
> Cheers
>
> Jason Haar
> Information Security Manager, Trimble Navigation Ltd.
> Phone: +1 408 481 8171
> PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1
>
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>
> --
> Vito A. Smaldino
>
>
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