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Subject: [Taps] Weekly github digest (TAPS GitHub Activity Digest)
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Issues
------
* ietf-tapswg/api-drafts (+2/-1/=F0=9F=92=AC6)
  2 issues created:
  - Nits on framers in arch-draft (by MaxF12)
    https://github.com/ietf-tapswg/api-drafts/issues/348 =

  - "Events" versus "Callbacks" for security-relevant asynchrony (by britra=
m)
    https://github.com/ietf-tapswg/api-drafts/issues/347 [API] [Architectur=
e] [discuss] =


  2 issues received 6 new comments:
  - #347 "Events" versus "Callbacks" for security-relevant asynchrony (4 by=
 philsbln, britram, tfpauly, MaxF12)
    https://github.com/ietf-tapswg/api-drafts/issues/347 [API] [Architectur=
e] [discuss] =

  - #325 Add support for Property Profiles (2 by philsbln, MaxF12)
    https://github.com/ietf-tapswg/api-drafts/issues/325 [API] [discuss] =


  1 issues closed:
  - Add support for Property Profiles https://github.com/ietf-tapswg/api-dr=
afts/issues/325 [API] [discuss] =




Pull requests
-------------
* ietf-tapswg/api-drafts (+1/-0/=F0=9F=92=AC1)
  1 pull requests submitted:
  - Fixes #313 per Gorry's comments (by britram)
    https://github.com/ietf-tapswg/api-drafts/pull/346 =


  1 pull requests received 1 new comments:
  - #346 Fixes #313 per Gorry's comments (1 by britram)
    https://github.com/ietf-tapswg/api-drafts/pull/346 =



Repositories tracked by this digest:
-----------------------------------
* https://github.com/ietf-tapswg/api-drafts

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<title>Weekly github digest (TAPS GitHub Activity Digest)</title>
<style>
body { font-family: Gotham, "Helvetica Neue", Helvetica, Arial, sans-serif;=
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<body>
<h1>Friday August 02, 2019</h1>


<h2>Issues</h2>

<h3>ietf-tapswg/api-drafts (+2/-1/=F0=9F=92=AC6)</h3>
  <p class=3D"new">2 issues created:</p>
  <ul>
  <li>#348 <a href=3D"https://github.com/ietf-tapswg/api-drafts/issues/348"=
>Nits on framers in arch-draft</a> (by MaxF12) </li>
  =

  <li>#347 <a href=3D"https://github.com/ietf-tapswg/api-drafts/issues/347"=
>&quot;Events&quot; versus &quot;Callbacks&quot; for security-relevant asyn=
chrony</a> (by britram) <span class=3D"label" style=3D"background-color: #f=
bca04; color: #000000">API</span> <span class=3D"label" style=3D"background=
-color: #fbca04; color: #000000">Architecture</span> <span class=3D"label" =
style=3D"background-color: #b60205; color: #ffffff">discuss</span> </li>
  </ul>

  <p>2 issues received 6 new comments:</p>
  <ul>
  <li>#347 <a href=3D"https://github.com/ietf-tapswg/api-drafts/issues/347"=
>&quot;Events&quot; versus &quot;Callbacks&quot; for security-relevant asyn=
chrony</a> (4 by philsbln, britram, tfpauly, MaxF12) <span class=3D"label" =
style=3D"background-color: #fbca04; color: #000000">API</span> <span class=
=3D"label" style=3D"background-color: #fbca04; color: #000000">Architecture=
</span> <span class=3D"label" style=3D"background-color: #b60205; color: #f=
fffff">discuss</span> </li>
  =

  <li>#325 <a href=3D"https://github.com/ietf-tapswg/api-drafts/issues/325"=
>Add support for Property Profiles</a> (2 by philsbln, MaxF12) <span class=
=3D"label" style=3D"background-color: #fbca04; color: #000000">API</span> <=
span class=3D"label" style=3D"background-color: #b60205; color: #ffffff">di=
scuss</span> </li>
  </ul>

  <p>1 issues closed:</p>
  <ul>
  <li>#325 <a href=3D"https://github.com/ietf-tapswg/api-drafts/issues/325"=
>Add support for Property Profiles</a> <span class=3D"label" style=3D"backg=
round-color: #fbca04; color: #000000">API</span> <span class=3D"label" styl=
e=3D"background-color: #b60205; color: #ffffff">discuss</span> </li>
  </ul>



<h2>Pull requests</h2>
<h3>ietf-tapswg/api-drafts (+1/-0/=F0=9F=92=AC1)</h3>
  <p class=3D"new">1 pull requests submitted:</p>
  <ul>
  <li>#346 <a href=3D"https://github.com/ietf-tapswg/api-drafts/pull/346">F=
ixes #313 per Gorry&#x27;s comments</a> (by britram) </li>
  </ul>

  <p>1 pull requests received 1 new comments:</p>
  <ul>
  <li>#346 <a href=3D"https://github.com/ietf-tapswg/api-drafts/pull/346">F=
ixes #313 per Gorry&#x27;s comments</a> (1 by britram) </li>
  </ul>



<h2>Repositories tracked by this digest:</h2>
<ul class=3D"repos">
  <li><a href=3D"https://github.com/ietf-tapswg/api-drafts">https://github.=
com/ietf-tapswg/api-drafts</a></li>
  </ul>
</body>
</html>

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From nobody Wed Aug  7 08:35:58 2019
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Subject: [Taps] I-D Action: draft-ietf-taps-transport-security-08.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Transport Services WG of the IETF.

        Title           : A Survey of Transport Security Protocols
        Authors         : Christopher A. Wood
                          Theresa Enghardt
                          Tommy Pauly
                          Colin Perkins
                          Kyle Rose
	Filename        : draft-ietf-taps-transport-security-08.txt
	Pages           : 37
	Date            : 2019-08-07

Abstract:
   This document provides a survey of commonly used or notable network
   security protocols, with a focus on how they interact and integrate
   with applications and transport protocols.  Its goal is to supplement
   efforts to define and catalog transport services by describing the
   interfaces required to add security protocols.  This survey is not
   limited to protocols developed within the scope or context of the
   IETF, and those included represent a superset of features a Transport
   Services system may need to support.  Moreover, this document defines
   a minimal set of security features that a secure transport system
   should provide.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-taps-transport-security/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-taps-transport-security-08
https://datatracker.ietf.org/doc/html/draft-ietf-taps-transport-security-08

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-taps-transport-security-08


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


From nobody Wed Aug  7 13:51:58 2019
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From: Toerless Eckert <tte@cs.fau.de>
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Subject: [Taps] TAPS (secure) connection maangement Q
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[ Sorry for being lazy and ask even though i haven't read all the documents.
  If the question is answers by some existing text/thread, pls. let me know. ]

Precursor question: Server for TCP connections wants to be able to
dynamically reject connection requests based on the clients connection
parameters, e.g.: client IP-address. Dynamic meaning that the server
should get a notification/callback, be able to examine the parameters
and decide. Aka: no predefined policy object that can not run server
code at the time of  receiving the client connection request.

I do not even remember wht the best current POSIX socket API is to do
this today. Traditionally, servers suck at this, because they use an
accept(), so the connection is established, and then they immediately
close the connection once they have retrieved the clients IP-address
(getpeername or the like).

So, the actual question is pretty much the same except that i don't care
about the client IP-address but for TLS connections in the ability for
the client-side to examine the server certificate presented and the
server-side to examine the client-side cetificate presented - and in
both cases have the hook for this notification/callback early enough 
in the sate machinery of the transport protocol that no unnecessary
steps are performed (e.g.: exactly NOT the above mentioned connect &
drop behavior).

Thanks!
    Toerless


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--Apple-Mail=_103BE246-70F8-4A5D-BF83-31D7E0BF460F
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Hi Toerless,

Thanks for the questions! Definitely an interesting topic.

I think what you're trying to get at, checking the client's =
authentication properties on the server, is described here: =
https://tools.ietf.org/html/draft-ietf-taps-interface-04#section-5.3.2.

   o  Trust verification callback: Invoked when a Remote Endpoint's
      trust must be validated before the handshake protocol can proceed.

   TrustCallback :=3D NewCallback({
     // Handle trust, return the result
   })
   SecurityParameters.SetTrustVerificationCallback(trustCallback)


The idea here is that when you configure TLS options on your Listener =
object, you can configure optional event callbacks to participate in the =
certificate checking, thus allowing the check to occur prior to the TLS =
handshake actually completing.

In the Apple implementation, we do this with a call =
"sec_protocol_options_set_verify_block", documented here:

=
https://developer.apple.com/documentation/security/2976289-sec_protocol_op=
tions_set_verify_?language=3Dobjc
=
https://developer.apple.com/documentation/network/security_options?languag=
e=3Dobjc

Related to this, we recently had an issue we were discussing around =
allowing the application to filter a connection prior to accepting TCP =
on a server, in the accept path =
(https://github.com/ietf-tapswg/api-drafts/issues/338). This type of =
event would *only* allow looking at the client IP address, and wouldn't =
help for looking at the TLS certificate. We determined that for the TCP =
case, there can often be a way to push down firewall type rules in the =
system, and doing this as a per-accept callback may not be the best =
model.

Thanks,
Tommy

> On Aug 7, 2019, at 1:51 PM, Toerless Eckert <tte@cs.fau.de> wrote:
>=20
> [ Sorry for being lazy and ask even though i haven't read all the =
documents.
>  If the question is answers by some existing text/thread, pls. let me =
know. ]
>=20
> Precursor question: Server for TCP connections wants to be able to
> dynamically reject connection requests based on the clients connection
> parameters, e.g.: client IP-address. Dynamic meaning that the server
> should get a notification/callback, be able to examine the parameters
> and decide. Aka: no predefined policy object that can not run server
> code at the time of  receiving the client connection request.
>=20
> I do not even remember wht the best current POSIX socket API is to do
> this today. Traditionally, servers suck at this, because they use an
> accept(), so the connection is established, and then they immediately
> close the connection once they have retrieved the clients IP-address
> (getpeername or the like).
>=20
> So, the actual question is pretty much the same except that i don't =
care
> about the client IP-address but for TLS connections in the ability for
> the client-side to examine the server certificate presented and the
> server-side to examine the client-side cetificate presented - and in
> both cases have the hook for this notification/callback early enough=20=

> in the sate machinery of the transport protocol that no unnecessary
> steps are performed (e.g.: exactly NOT the above mentioned connect &
> drop behavior).
>=20
> Thanks!
>    Toerless
>=20
> _______________________________________________
> Taps mailing list
> Taps@ietf.org
> https://www.ietf.org/mailman/listinfo/taps


--Apple-Mail=_103BE246-70F8-4A5D-BF83-31D7E0BF460F
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	charset=us-ascii

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">Hi =
Toerless,<div class=3D""><br class=3D""></div><div class=3D"">Thanks for =
the questions! Definitely an interesting topic.</div><div class=3D""><br =
class=3D""></div><div class=3D"">I think what you're trying to get at, =
checking the client's authentication properties on the server, is =
described here: <a =
href=3D"https://tools.ietf.org/html/draft-ietf-taps-interface-04#section-5=
.3.2" =
class=3D"">https://tools.ietf.org/html/draft-ietf-taps-interface-04#sectio=
n-5.3.2</a>.</div><div class=3D""><br class=3D""></div><div =
class=3D""><pre class=3D"newpage" style=3D"font-size: =
13.333333015441895px; margin-top: 0px; margin-bottom: 0px; break-before: =
page;">   o  Trust verification callback: Invoked when a Remote =
Endpoint's
      trust must be validated before the handshake protocol can proceed.

   TrustCallback :=3D NewCallback({
     // Handle trust, return the result
   })
   =
SecurityParameters.SetTrustVerificationCallback(trustCallback)</pre><div =
class=3D""><br class=3D""></div></div><div class=3D""><br =
class=3D""></div><div class=3D"">The idea here is that when you =
configure TLS options on your Listener object, you can configure =
optional event callbacks to participate in the certificate checking, =
thus allowing the check to occur prior to the TLS handshake actually =
completing.</div><div class=3D""><br class=3D""></div><div class=3D"">In =
the Apple implementation, we do this with a call =
"sec_protocol_options_set_verify_block", documented here:</div><div =
class=3D""><br class=3D""></div><div class=3D""><a =
href=3D"https://developer.apple.com/documentation/security/2976289-sec_pro=
tocol_options_set_verify_?language=3Dobjc" =
class=3D"">https://developer.apple.com/documentation/security/2976289-sec_=
protocol_options_set_verify_?language=3Dobjc</a></div><div class=3D""><a =
href=3D"https://developer.apple.com/documentation/network/security_options=
?language=3Dobjc" =
class=3D"">https://developer.apple.com/documentation/network/security_opti=
ons?language=3Dobjc</a></div><div class=3D""><br class=3D""></div><div =
class=3D"">Related to this, we recently had an issue we were discussing =
around allowing the application to filter a connection prior to =
accepting TCP on a server, in the accept path (<a =
href=3D"https://github.com/ietf-tapswg/api-drafts/issues/338" =
class=3D"">https://github.com/ietf-tapswg/api-drafts/issues/338</a>). =
This type of event would *only* allow looking at the client IP address, =
and wouldn't help for looking at the TLS certificate. We determined that =
for the TCP case, there can often be a way to push down firewall type =
rules in the system, and doing this as a per-accept callback may not be =
the best model.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Thanks,</div><div class=3D"">Tommy</div><div =
class=3D""><div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">On Aug 7, 2019, at 1:51 PM, Toerless Eckert &lt;<a =
href=3D"mailto:tte@cs.fau.de" class=3D"">tte@cs.fau.de</a>&gt; =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"">[ Sorry for being lazy and ask even though i haven't read all =
the documents.<br class=3D""> &nbsp;If the question is answers by some =
existing text/thread, pls. let me know. ]<br class=3D""><br =
class=3D"">Precursor question: Server for TCP connections wants to be =
able to<br class=3D"">dynamically reject connection requests based on =
the clients connection<br class=3D"">parameters, e.g.: client =
IP-address. Dynamic meaning that the server<br class=3D"">should get a =
notification/callback, be able to examine the parameters<br class=3D"">and=
 decide. Aka: no predefined policy object that can not run server<br =
class=3D"">code at the time of &nbsp;receiving the client connection =
request.<br class=3D""><br class=3D"">I do not even remember wht the =
best current POSIX socket API is to do<br class=3D"">this today. =
Traditionally, servers suck at this, because they use an<br =
class=3D"">accept(), so the connection is established, and then they =
immediately<br class=3D"">close the connection once they have retrieved =
the clients IP-address<br class=3D"">(getpeername or the like).<br =
class=3D""><br class=3D"">So, the actual question is pretty much the =
same except that i don't care<br class=3D"">about the client IP-address =
but for TLS connections in the ability for<br class=3D"">the client-side =
to examine the server certificate presented and the<br =
class=3D"">server-side to examine the client-side cetificate presented - =
and in<br class=3D"">both cases have the hook for this =
notification/callback early enough <br class=3D"">in the sate machinery =
of the transport protocol that no unnecessary<br class=3D"">steps are =
performed (e.g.: exactly NOT the above mentioned connect &amp;<br =
class=3D"">drop behavior).<br class=3D""><br class=3D"">Thanks!<br =
class=3D""> &nbsp;&nbsp;&nbsp;Toerless<br class=3D""><br =
class=3D"">_______________________________________________<br =
class=3D"">Taps mailing list<br class=3D""><a =
href=3D"mailto:Taps@ietf.org" class=3D"">Taps@ietf.org</a><br =
class=3D"">https://www.ietf.org/mailman/listinfo/taps<br =
class=3D""></div></div></blockquote></div><br =
class=3D""></div></body></html>=

--Apple-Mail=_103BE246-70F8-4A5D-BF83-31D7E0BF460F--


From nobody Thu Aug  8 12:32:16 2019
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Date: Thu, 8 Aug 2019 21:31:54 +0200
From: Toerless Eckert <tte@cs.fau.de>
To: Tommy Pauly <tpauly@apple.com>
Cc: taps@ietf.org
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Subject: Re: [Taps] TAPS (secure) connection maangement Q
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Thanks Tommy,

I couldn't quite figure out from the spec what context/parameters
would be made available to the callback.

Also: i would be worried about not having the callback option for
the client IP address checking. Just think of all the apps 
doing GeoBlocking (video streaming) or verifying client DNS
domain for list of subscribers (academic papers come to mind).
I don't think you always want to force the server software
developer to calculate such a long ACL upfront. It might be
preferred in high-performance cases, but the most simple server
would do this on-demand.

Cheers
    Toerless

On Wed, Aug 07, 2019 at 02:43:35PM -0700, Tommy Pauly wrote:
> Hi Toerless,
> 
> Thanks for the questions! Definitely an interesting topic.
> 
> I think what you're trying to get at, checking the client's authentication properties on the server, is described here: https://tools.ietf.org/html/draft-ietf-taps-interface-04#section-5.3.2.
> 
>    o  Trust verification callback: Invoked when a Remote Endpoint's
>       trust must be validated before the handshake protocol can proceed.
> 
>    TrustCallback := NewCallback({
>      // Handle trust, return the result
>    })
>    SecurityParameters.SetTrustVerificationCallback(trustCallback)
> 
> 
> The idea here is that when you configure TLS options on your Listener object, you can configure optional event callbacks to participate in the certificate checking, thus allowing the check to occur prior to the TLS handshake actually completing.
> 
> In the Apple implementation, we do this with a call "sec_protocol_options_set_verify_block", documented here:
> 
> https://developer.apple.com/documentation/security/2976289-sec_protocol_options_set_verify_?language=objc
> https://developer.apple.com/documentation/network/security_options?language=objc
> 
> Related to this, we recently had an issue we were discussing around allowing the application to filter a connection prior to accepting TCP on a server, in the accept path (https://github.com/ietf-tapswg/api-drafts/issues/338). This type of event would *only* allow looking at the client IP address, and wouldn't help for looking at the TLS certificate. We determined that for the TCP case, there can often be a way to push down firewall type rules in the system, and doing this as a per-accept callback may not be the best model.
> 
> Thanks,
> Tommy
> 
> > On Aug 7, 2019, at 1:51 PM, Toerless Eckert <tte@cs.fau.de> wrote:
> > 
> > [ Sorry for being lazy and ask even though i haven't read all the documents.
> >  If the question is answers by some existing text/thread, pls. let me know. ]
> > 
> > Precursor question: Server for TCP connections wants to be able to
> > dynamically reject connection requests based on the clients connection
> > parameters, e.g.: client IP-address. Dynamic meaning that the server
> > should get a notification/callback, be able to examine the parameters
> > and decide. Aka: no predefined policy object that can not run server
> > code at the time of  receiving the client connection request.
> > 
> > I do not even remember wht the best current POSIX socket API is to do
> > this today. Traditionally, servers suck at this, because they use an
> > accept(), so the connection is established, and then they immediately
> > close the connection once they have retrieved the clients IP-address
> > (getpeername or the like).
> > 
> > So, the actual question is pretty much the same except that i don't care
> > about the client IP-address but for TLS connections in the ability for
> > the client-side to examine the server certificate presented and the
> > server-side to examine the client-side cetificate presented - and in
> > both cases have the hook for this notification/callback early enough 
> > in the sate machinery of the transport protocol that no unnecessary
> > steps are performed (e.g.: exactly NOT the above mentioned connect &
> > drop behavior).
> > 
> > Thanks!
> >    Toerless
> > 
> > _______________________________________________
> > Taps mailing list
> > Taps@ietf.org
> > https://www.ietf.org/mailman/listinfo/taps
> 

-- 
---
tte@cs.fau.de


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Subject: Re: [Taps] TAPS (secure) connection maangement Q
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Aaron Falk has requested publication of draft-ietf-taps-transport-security-08 as Informational on behalf of the TAPS working group.

Please verify the document's state at https://datatracker.ietf.org/doc/draft-ietf-taps-transport-security/


From nobody Mon Aug 12 15:35:29 2019
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From: Toerless Eckert <tte@cs.fau.de>
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Subject: Re: [Taps] TAPS (secure) connection maangement Q
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Max,

as i tried to explain in my last reply, my preferred API would be to
have a functional callback at the appropriate stage of the
connection establishment to check the source-ip address dynamically
and then proceed with connection establishment or reject it.

Cheers
    Toerless

On Thu, Aug 08, 2019 at 11:27:56PM +0200, Max Franke wrote:
> <div dir='auto'><div>Hi Toerless,</div><div dir="auto"><br></div><div dir="auto">at the moment you could force your listener to only accept connections from specific IP addresses by setting a remoteEndpoint on the Preconnection before calling listen().&nbsp;</div><div dir="auto">Though I agree that it might indeed be good idea to also make it possible to provide a blacklist of specific IPs from which you dont want accept connections.<br><div class="gmail_extra" dir="auto"><br></div><div class="gmail_extra" dir="auto">Best</div><div class="gmail_extra" dir="auto">Max</div><div class="gmail_extra" dir="auto"><br><div class="gmail_quote" dir="auto">Am 08.08.2019 21:31 schrieb Toerless Eckert &lt;tte@cs.fau.de&gt;:<br type="attribution"><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p dir="ltr">Thanks Tommy,
> <br>
> 
> <br>
> I couldn't quite figure out from the spec what context/parameters
> <br>
> would be made available to the callback.
> <br>
> 
> <br>
> Also: i would be worried about not having the callback option for
> <br>
> the client IP address checking. Just think of all the apps 
> <br>
> doing GeoBlocking (video streaming) or verifying client DNS
> <br>
> domain for list of subscribers (academic papers come to mind).
> <br>
> I don't think you always want to force the server software
> <br>
> developer to calculate such a long ACL upfront. It might be
> <br>
> preferred in high-performance cases, but the most simple server
> <br>
> would do this on-demand.
> <br>
> 
> <br>
> Cheers
> <br>
> &nbsp;&nbsp;&nbsp; Toerless
> <br>
> 
> <br>
> On Wed, Aug 07, 2019 at 02:43:35PM -0700, Tommy Pauly wrote:
> <br>
> &gt; Hi Toerless,
> <br>
> &gt; 
> <br>
> &gt; Thanks for the questions! Definitely an interesting topic.
> <br>
> &gt; 
> <br>
> &gt; I think what you're trying to get at, checking the client's authentication properties on the server, is described here: https://tools.ietf.org/html/draft-ietf-taps-interface-04#section-5.3.2.
> <br>
> &gt; 
> <br>
> &gt;&nbsp;&nbsp;&nbsp; o&nbsp; Trust verification callback: Invoked when a Remote Endpoint's
> <br>
> &gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; trust must be validated before the handshake protocol can proceed.
> <br>
> &gt; 
> <br>
> &gt;&nbsp;&nbsp;&nbsp; TrustCallback := NewCallback({
> <br>
> &gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // Handle trust, return the result
> <br>
> &gt;&nbsp;&nbsp;&nbsp; })
> <br>
> &gt;&nbsp;&nbsp;&nbsp; SecurityParameters.SetTrustVerificationCallback(trustCallback)
> <br>
> &gt; 
> <br>
> &gt; 
> <br>
> &gt; The idea here is that when you configure TLS options on your Listener object, you can configure optional event callbacks to participate in the certificate checking, thus allowing the check to occur prior to the TLS handshake actually completing.
> <br>
> &gt; 
> <br>
> &gt; In the Apple implementation, we do this with a call "sec_protocol_options_set_verify_block", documented here:
> <br>
> &gt; 
> <br>
> &gt; https://developer.apple.com/documentation/security/2976289-sec_protocol_options_set_verify_?language=objc
> <br>
> &gt; https://developer.apple.com/documentation/network/security_options?language=objc
> <br>
> &gt; 
> <br>
> &gt; Related to this, we recently had an issue we were discussing around allowing the application to filter a connection prior to accepting TCP on a server, in the accept path (https://github.com/ietf-tapswg/api-drafts/issues/338). This type of event would *only* allow looking at the client IP address, and wouldn't help for looking at the TLS certificate. We determined that for the TCP case, there can often be a way to push down firewall type rules in the system, and doing this as a per-accept callback may not be the best model.
> <br>
> &gt; 
> <br>
> &gt; Thanks,
> <br>
> &gt; Tommy
> <br>
> &gt; 
> <br>
> &gt; &gt; On Aug 7, 2019, at 1:51 PM, Toerless Eckert &lt;tte@cs.fau.de&gt; wrote:
> <br>
> &gt; &gt; 
> <br>
> &gt; &gt; [ Sorry for being lazy and ask even though i haven't read all the documents.
> <br>
> &gt; &gt;&nbsp; If the question is answers by some existing text/thread, pls. let me know. ]
> <br>
> &gt; &gt; 
> <br>
> &gt; &gt; Precursor question: Server for TCP connections wants to be able to
> <br>
> &gt; &gt; dynamically reject connection requests based on the clients connection
> <br>
> &gt; &gt; parameters, e.g.: client IP-address. Dynamic meaning that the server
> <br>
> &gt; &gt; should get a notification/callback, be able to examine the parameters
> <br>
> &gt; &gt; and decide. Aka: no predefined policy object that can not run server
> <br>
> &gt; &gt; code at the time of&nbsp; receiving the client connection request.
> <br>
> &gt; &gt; 
> <br>
> &gt; &gt; I do not even remember wht the best current POSIX socket API is to do
> <br>
> &gt; &gt; this today. Traditionally, servers suck at this, because they use an
> <br>
> &gt; &gt; accept(), so the connection is established, and then they immediately
> <br>
> &gt; &gt; close the connection once they have retrieved the clients IP-address
> <br>
> &gt; &gt; (getpeername or the like).
> <br>
> &gt; &gt; 
> <br>
> &gt; &gt; So, the actual question is pretty much the same except that i don't care
> <br>
> &gt; &gt; about the client IP-address but for TLS connections in the ability for
> <br>
> &gt; &gt; the client-side to examine the server certificate presented and the
> <br>
> &gt; &gt; server-side to examine the client-side cetificate presented - and in
> <br>
> &gt; &gt; both cases have the hook for this notification/callback early enough 
> <br>
> &gt; &gt; in the sate machinery of the transport protocol that no unnecessary
> <br>
> &gt; &gt; steps are performed (e.g.: exactly NOT the above mentioned connect &amp;
> <br>
> &gt; &gt; drop behavior).
> <br>
> &gt; &gt; 
> <br>
> &gt; &gt; Thanks!
> <br>
> &gt; &gt;&nbsp;&nbsp;&nbsp; Toerless
> <br>
> &gt; &gt; 
> <br>
> &gt; &gt; _______________________________________________
> <br>
> &gt; &gt; Taps mailing list
> <br>
> &gt; &gt; Taps@ietf.org
> <br>
> &gt; &gt; https://www.ietf.org/mailman/listinfo/taps
> <br>
> &gt; 
> <br>
> 
> <br>
> -- 
> <br>
> ---
> <br>
> tte@cs.fau.de
> <br>
> 
> <br>
> _______________________________________________
> <br>
> Taps mailing list
> <br>
> Taps@ietf.org
> <br>
> https://www.ietf.org/mailman/listinfo/taps
> <br>
> </p>
> </blockquote></div><br></div></div></div>


From nobody Thu Aug 22 06:50:53 2019
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Subject: [Taps] taps - New Meeting Session Request for IETF 106
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A new meeting session request has just been submitted by Aaron Falk, a Chair of the taps working group.


---------------------------------------------------------
Working Group Name: Transport Services
Area Name: Transport Area
Session Requester: Aaron Falk

Number of Sessions: 1
Length of Session(s):  2 Hours
Number of Attendees: 50
Conflicts to Avoid: 
 Chair Conflict: MAPRG, PANRG, HTTPBIS
 Technology Overlap: QUIC, TLS, TSVAREA, TSVWG, TCPM, ICCRG coinrg
 Key Participant Conflict: IRTFOPEN, RMCAT, AVTCORE, MOPS, LOOPS , mboned, secdispatch, mops, tsvwg, IPPM


People who must be present:
  Colin Perkins
  Aaron Falk
  Michael Welzl
  Magnus Westerlund
  Gorry Fairhurst
  Brian Trammell
  Zaheduzzaman Sarker
  Mirja Kuehlewind
  Anna Brunstrom
  Tommy Pauly
  Kyle Rose
  Christopher A. Wood
  Jake Holland
  Philipp S. Tiesel
  Theresa Enghardt

Resources Requested:

Special Requests:
  The IRTF Chair is a contributor to TAPS so please avoid IRTF RGs if possible.
---------------------------------------------------------


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Issues
------
* ietf-tapswg/api-drafts (+0/-1/=F0=9F=92=AC2)
  1 issues received 2 new comments:
  - #336 Send() -> Sent<> mapping underspecified (2 by tfpauly)
    https://github.com/ietf-tapswg/api-drafts/issues/336 [API] [ready for t=
ext] =


  1 issues closed:
  - Send() -> Sent<> mapping underspecified https://github.com/ietf-tapswg/=
api-drafts/issues/336 [API] [ready for text] =




Pull requests
-------------
* ietf-tapswg/api-drafts (+1/-0/=F0=9F=92=AC0)
  1 pull requests submitted:
  - Address review comments on architecture draft (by tfpauly)
    https://github.com/ietf-tapswg/api-drafts/pull/349 =



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-----------------------------------
* https://github.com/ietf-tapswg/api-drafts

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<h1>Friday August 23, 2019</h1>


<h2>Issues</h2>

<h3>ietf-tapswg/api-drafts (+0/-1/=F0=9F=92=AC2)</h3>

  <p>1 issues received 2 new comments:</p>
  <ul>
  <li>#336 <a href=3D"https://github.com/ietf-tapswg/api-drafts/issues/336"=
>Send() -&gt; Sent&lt;&gt; mapping underspecified</a> (2 by tfpauly) <span =
class=3D"label" style=3D"background-color: #fbca04; color: #000000">API</sp=
an> <span class=3D"label" style=3D"background-color: #4ae0d1; color: #00000=
0">ready for text</span> </li>
  </ul>

  <p>1 issues closed:</p>
  <ul>
  <li>#336 <a href=3D"https://github.com/ietf-tapswg/api-drafts/issues/336"=
>Send() -&gt; Sent&lt;&gt; mapping underspecified</a> <span class=3D"label"=
 style=3D"background-color: #fbca04; color: #000000">API</span> <span class=
=3D"label" style=3D"background-color: #4ae0d1; color: #000000">ready for te=
xt</span> </li>
  </ul>



<h2>Pull requests</h2>
<h3>ietf-tapswg/api-drafts (+1/-0/=F0=9F=92=AC0)</h3>
  <p class=3D"new">1 pull requests submitted:</p>
  <ul>
  <li>#349 <a href=3D"https://github.com/ietf-tapswg/api-drafts/pull/349">A=
ddress review comments on architecture draft</a> (by tfpauly) </li>
  </ul>




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Pull requests
-------------
* ietf-tapswg/api-drafts (+1/-1/=F0=9F=92=AC0)
  1 pull requests submitted:
  - Allow setting new connection limits for inbound connections (by tfpauly)
    https://github.com/ietf-tapswg/api-drafts/pull/350 =


  1 pull requests merged:
  - Address review comments on architecture draft
    https://github.com/ietf-tapswg/api-drafts/pull/349 [Architecture] =



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<h1>Friday August 30, 2019</h1>




<h2>Pull requests</h2>
<h3>ietf-tapswg/api-drafts (+1/-1/=F0=9F=92=AC0)</h3>
  <p class=3D"new">1 pull requests submitted:</p>
  <ul>
  <li>#350 <a href=3D"https://github.com/ietf-tapswg/api-drafts/pull/350">A=
llow setting new connection limits for inbound connections</a> (by tfpauly)=
 </li>
  </ul>


  <p>1 pull requests merged:</p>
  <ul>
  <li>#349 <a href=3D"https://github.com/ietf-tapswg/api-drafts/pull/349">A=
ddress review comments on architecture draft</a> <span class=3D"label" styl=
e=3D"background-color: #fbca04; color: #">Architecture</span> </li>
  </ul>


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