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using splice just to improve TLS SNI logging

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Hi there

We just had an incident where I would really have liked to have had
transparent TLS intercept in place. Currently I'm still in
"experimental" phase and don't want to go full "bump", but some quick
testing of just activating "splice" with TLS intercept seems to me to be
zero risk

ie instead of allowing direct port 443 Internet access, redirect it back
onto squid-3.5 set to splice all port 443 traffic. End result is squid
logfiles containing the following

.. CONNECT 1.2.3.4:443 blah
.. CONNECT real.SNI.name:443 blah

Then at least I can see what HTTPS sites have been visited when I need to.

Does going "splice" mode avoid all the potential SSL/TLS issues
surrounding bump? ie it won't care about client certs, weird TLS
extensions, etc? (ie other than availability, it shouldn't introduce a
new way of failing?)

Thanks!

-- 
Cheers

Jason Haar
Corporate 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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