On 24.1.2017 12.18, Hartmaier Alexander wrote:
Yes, that's correct. The information saved for resume has the same
lifetime. Also, if it happens that a session is resumed by TLS layer
but Radiator has no information about the resumed session, the
authentication will fail.
I can't confirm that behaviour. For us the (by OpenSSL) successfully
resumed session was accepted without any reply attributes leading to
clients not getting in the correct vlan. That's why I've assumed that
the resume context wasn't saved or restored correctly.
I think I might know why you are not seeing the your reply attributes,
please see below.
That explains why my change from $p->{EAPContext}->{hvn_test} to
$p->{EAPContext}->{eap_resume_context}->{hvn_test} in
EAPTLS_CertificateVerifyHook didn't work at all, Radiator overwrote
->{eap_resume_context} without checking that it's already there assuming
noone fiddled with it in a hook.
Correct. It only goes and fetches the information needed across resumes
when TLS handshake has completed. The hook runs before that.
To summarize, your suggested solution is:
- store custom variables in $p->{EAPContext} in
EAPTLS_CertificateVerifyHook
Yes. The context is available at that point. The saved resume
information has not been fetched yet.
- move them from $p->{EAPContext} to
$p->{EAPContext}->{eap_resume_context} in a PostAuthHook which can be
both in the EAP enabled AuthBy or the Handler for full authentications
(non-resumed). This is something I've never tried.
Yes, when you do this after full TLS handshake, the values will be
available when resume happens.
- access the stored variables in $p->{EAPContext}->{eap_resume_context}
when resuming. Is there a need to copy them to $p->{EAPContext} if I
only need their values in the PostAuthHook?
There's no need to copy them if it's ok for you to access them from
eap_resume_context.
- set the reply attributes based on the variables. Here I'd unsure if I
only need to set them for full authentications, because Radiator
persists them $p->{EAPContext}->{eap_resume_context} automatically or if
I need to do that myself because PostAuthHook is after Radiator has done
that already?
I think this might be the reason why you are not seeing the reply
attributes. The attributes (last_reply_attrs) in resume context are not
automatically updated if you add your own custom attributes in the
reply, for example, in PostAuthHook.
The attributes, last_reply_attrs, in resume context are the ones that
the inner authentication returned during the full authentication. If you
update those attributes with your custom reply attributes during the
full authentication in PostAuthHook, then your custom attributes should
be automatically added during resumption.
Our findings from Friday and yesterday where that only PEAP-TLS fails,
EAP-TLS works fine.
The latter is EAP-TTLS and the problem is PEAP/EAP-TLS?
We've disabled session resumption for all PEAP-TLS authentications, both
wired and wireless to work around the missing reply attributes on
resumption which lead to duplicate request errors.
I did a packet capture on the radius server and saw that the first
packet after the (PEAP) TLS tunnel establishment never gets replied by
radiator (radius packet id 57 in our capture) but it's retransmission by
the Cisco WLC after 5 seconds still gets logged as 'Duplicate request id
57 received from ...'. Do you have any idea why this could be happening?
Can't really say without logs. However, if it's related to fragment
sizes, then the adjustment in Radiator does seems not to be enough. It
uses value of 40 but as you wrote, you seem to be needing adjustment of 50.
Further as Radiator 4.13 changelog states that it handles
EAPTLS_MaxFragmentSize of the inner EAP method automatically we've
commented our inner EAPTLS_MaxFragmentSize 1200 which lead to a non
working auth for certificates from two of our three CAs.
We had issues when we onboarded that CA and had to reduce both the outer
PEAP as well as the inner EAP-TLS EAPTLS_MaxFragmentSize by 50 to get it
working.
May there be an edge case that some auths hang because of a too large
packet (for which no error is logged by Radiator) which leads to not
replied requests which IDs are still remembered as already received by
Radiator?
That's a possibility since the adjustment is 40 which seems to be too
little since you need 50. We probably need to update this value.
Thanks,
Heikki
--
Heikki Vatiainen <h...@open.com.au>
Radiator: the most portable, flexible and configurable RADIUS server
anywhere. SQL, proxy, DBM, files, LDAP, NIS+, password, NT, Emerald,
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