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Hi Heikki,</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
today at noon I had the change to reenable Cisco Duo and set TLS to v1.2.</div>
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So far it looks good, I saw other authentication requests getting processed while AuthBy DUO waited for a user response.</div>
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<br>
</div>
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I haven't grapsed so far how TLSv1.3 could cause this bug?</div>
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If I understood it correctly, the underlying socket reports available data via select although none has been received so far [1].</div>
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Is that correct?</div>
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How does the TLS version influence that?<br>
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<br>
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Best regards, Alex<br>
</div>
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[1] <a href="https://metacpan.org/release/HTTP-Async/source/lib/HTTP/Async.pm#L551" id="LPlnk431157">
https://metacpan.org/release/HTTP-Async/source/lib/HTTP/Async.pm#L551</a><br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>Von:</b> radiator <radiator-bounces@lists.open.com.au> im Auftrag von Hartmaier, Alexander <alexander.hartmaier@t-systems.com><br>
<b>Gesendet:</b> Freitag, 28. Mai 2021 09:25<br>
<b>An:</b> hvn@open.com.au <hvn@open.com.au>; radiator@lists.open.com.au <radiator@lists.open.com.au><br>
<b>Betreff:</b> Re: [RADIATOR] AuthBy DUO issue</font>
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Good morning Heikki,</div>
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awesome support from you as always, thank you!!!</div>
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I saw that the connection to Duo is TLS 1.3 in the packet captures I've taken.</div>
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Will try your suggestion and report back.<br>
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Best regards, Alex<br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>Von:</b> radiator <radiator-bounces@lists.open.com.au> im Auftrag von Heikki Vatiainen <hvn@open.com.au><br>
<b>Gesendet:</b> Donnerstag, 27. Mai 2021 18:57<br>
<b>An:</b> radiator@lists.open.com.au <radiator@lists.open.com.au><br>
<b>Betreff:</b> Re: [RADIATOR] AuthBy DUO issue</font>
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<div class="x_PlainText">On 27.5.2021 19.36, Heikki Vatiainen wrote:<br>
> On 27.5.2021 14.58, Alexander.Hartmaier@t-systems.com wrote:<br>
<br>
>> Is this a known issue?<br>
<br>
> As mentioned above, it's not. From what I know it's been used <br>
> successfully on RHEL/CentOS systems and it works for me on Mac.<br>
<br>
The problem might be TLS version related. The above don't do TLSv1.3.<br>
<br>
> I'd say this is something specific for Debian 10 because the problem is <br>
> not that hard to reproduce. This needs further investigation.<br>
<br>
If possible, can you update AuthDUO.pm sub get_ssl_opts() with the <br>
following:<br>
<br>
$ssl_opts{SSL_version} = 'TLSv1_2';<br>
<br>
This kind of behaviour where TLS socket indicates read but there's no <br>
user data available reminded me about TLS 1.3 and how it can send keys <br>
for session resumption after TLS handshake has been done.<br>
<br>
A look at HTTPS traffic shows that there's both TLS 1.2 and 1.3 by <br>
default. Restricting TLS to 1.2 seems to make the problem go away.<br>
<br>
If you could also check this, please let me know if it changes anything.<br>
<br>
Thanks,<br>
Heikki<br>
<br>
<br>
-- <br>
Heikki Vatiainen <hvn@open.com.au><br>
<br>
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