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Add TLS 1.3 fix and testcase.

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It turns out that Chrome supports an experimental mode to support TLS
1.3, which uses a non-standard way to negotiate TLS 1.3 with a server.
This non-standard way to negotiate TLS 1.3 breaks the current draft RFC
and re-uses an extension on the server-side with a different binary
formatting, causing us to throw a binpac exception.

This patch ignores the extension when sent by the server, continuing to
correctly parse the server_hello reply (as far as possible).

From what I can tell this seems to be google working around the fact
that MITM equipment cannot deal with TLS 1.3 server hellos; this change
makes the fact that TLS 1.3 is used completely opaque unless one looks
into a few extensions.

We currently log this as TLS 1.2.
This commit is contained in:
Johanna Amann 2017-09-09 22:25:49 -07:00
parent 5efaaf1368
commit 1ede6bf7fe
5 changed files with 33 additions and 1 deletions
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testing/btest/Baseline/scripts.base.protocols.ssl.tls13-experiment/.stdout Normal file
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testing/btest/Baseline/scripts.base.protocols.ssl.tls13-experiment/ssl.log Normal file
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#separator \x09
#set_separator ,
#empty_field (empty)
#unset_field -
#path ssl
#open 2017-09-10-05-23-15
#fields ts uid id.orig_h id.orig_p id.resp_h id.resp_p version cipher curve server_name resumed last_alert next_protocol established cert_chain_fuids client_cert_chain_fuids subject issuer client_subject client_issuer
#types time string addr port addr port string string string string bool string string bool vector[string] vector[string] string string string string
1505019126.007778 CHhAvVGS1DHFjwGM9 192.168.0.2 62873 104.196.219.53 443 TLSv12 TLS_AES_128_GCM_SHA256 x25519 tls.ctf.network T - - T - - - - - -
#close 2017-09-10-05-23-16