[erlang-questions] use_srtp extension for DTLS

Andreas Schultz andreas.schultz@REDACTED
Mon Oct 8 13:49:00 CEST 2018


Loïc Hoguin <essen@REDACTED> schrieb am Mo., 8. Okt. 2018 um 13:39 Uhr:

> This seems to be a similar issue to the one I have about tunneling TLS
> connections through TLS proxies (particularly the HTTP/2 case), although
> my proposed solution would probably not work in your case:
> https://bugs.erlang.org/browse/ERL-728


You can already use the cb_info option with a custom transport module to
build that.

In theory, the STRP and STUN over DTLS use case should be doable with that
as well.
Ingela recently fixed a few things in the DTLS module recently [1] to make
this work.

I always meant to port my CAPWAP DTLS use case to this, but havn't gotten
the
time to actually to it.

Andreas

[1]:
https://github.com/erlang/otp/commit/72aaa1bb0cd2352fc8708a1a89b44e5791f49356


>
> Perhaps we need some kind of socket-less ssl connection process that we
> feed directly and that sends us back whatever encrypted data needs to be
> sent.
>
> On 10/8/18 1:08 PM, Ben Browitt wrote:
> > What about being able to handle DTLS, STRP and STUN packets on the same
> > UDP socket?
> > It will be best if I could create a UDP socket in my app, filter packets
> > and pass only DTLS packets to the ssl socket/process.
> > Without this, DTLS in the ssl app can't be used for WebRTC connections.
> > Is this also planned?
> >
> > On Mon, Oct 8, 2018 at 1:48 PM Andreas Schultz
> > <andreas.schultz@REDACTED <mailto:andreas.schultz@REDACTED>>
>
> > wrote:
> >
> >     Hi Ingela,
> >
> >     Ingela Andin <ingela.andin@REDACTED
> >     <mailto:ingela.andin@REDACTED>> schrieb am Mo., 8. Okt. 2018 um
> >     12:27 Uhr:
> >
> >         Hi!
> >
> >         Sorry for late answer. Yes there are plans to include it. It
> >         extension is also part of TLS-1.3 that has priority over DTLS at
> >         the moment. We have already  done
> >
> >
> >     Can't speak for others, but I would prefer if DTLS-1.3 where give
> >     the same priority as TLS-1.3.
> >
> >     Regards
> >     Andreas
> >
> >         some internal changes to extension handling to facilitate the
> >         implementation of TLS-1.3 and its co-existing with previous
> >         versions.  This is in first hand planned for OTP-22.
> >
> >         Regards Ingela Erlang/OTP Team - Ericsson AB
> >
> >
> >         Den mån 8 okt. 2018 kl 06:58 skrev Ben Browitt
> >         <ben.browitt@REDACTED <mailto:ben.browitt@REDACTED>>:
> >
> >             USE_SRTP is defined in dtls_handshake.hrl [1] but it says
> >             it's not supported.
> >             Are there plans to support it?
> >
> >             [1]
> >
> https://github.com/erlang/otp/blob/master/lib/ssl/src/dtls_handshake.hrl#L64
> >
> >             On Mon, Oct 1, 2018 at 11:27 AM Ben Browitt
> >             <ben.browitt@REDACTED <mailto:ben.browitt@REDACTED>>
> wrote:
> >
> >                 DTLS is missing the use_srtp extension required for
> >                 DTLS-SRTP [1].
> >                 What's the best way to add it?
> >
> >                 We need to encode the extension in ssl_handshake.erl
> >                 encode_hello_extensions([use_srtp | Rest], Acc) ->
> >                      ExtData = <<0,2,0,1,0>>,
> >                      Len = byte_size(ExtData),
> >                      encode_hello_extensions(Rest,
> >                 <<?UINT16(?USE_SRTP_EXT), ?UINT16(Len), ExtData/binary,
> >                 Acc/binary>>).
> >
> https://github.com/erlang/otp/blob/master/lib/ssl/src/ssl_handshake.erl#L657
> >
> >                 Define USE_SRTP_EXT in ssl_handshake.hrl
> >                 -define(USE_SRTP_EXT, 14).
> >
> >                 Add use_srtp to the hello_extensions record:
> >
> https://github.com/erlang/otp/blob/master/lib/ssl/src/ssl_handshake.hrl#L100
> >
> >                 Add use_srtp to hello_extensions_list
> >
> https://github.com/erlang/otp/blob/master/lib/ssl/src/ssl_handshake.erl#L1826
> >
> >                 Add use_srtp to client_hello_extensions
> >
> https://github.com/erlang/otp/blob/master/lib/ssl/src/ssl_handshake.erl#L968
> >
> >                 Add use_srtp to the #ssl_options record
> >
> https://github.com/erlang/otp/blob/master/lib/ssl/src/ssl_internal.hrl#L111
> >
> >                 [1] https://tools.ietf.org/html/rfc5764#section-4.1
> >
> >                 Thanks
> >
> >             _______________________________________________
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> >     --
> >     --
> >     Dipl.-Inform. Andreas Schultz
> >
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>
> --
> Loïc Hoguin
> https://ninenines.eu
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Dipl.-Inform. Andreas Schultz

----------------------- enabling your networks ----------------------
Travelping GmbH                     Phone:  +49-391-81 90 99 0
Roentgenstr. 13                     Fax:    +49-391-81 90 99 299
39108 Magdeburg                     Email:  info@REDACTED
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