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From: Jouni Korhonen <jouni.nospam@gmail.com>
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Subject: [radext] WGLC #1 for draft-ietf-radext-nai-03
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Folks,

This email starts a two week WGLC for draft-ietf-radext-nai-03. The WGLC end
18th June 2013 EOB (EEST). We require minimum three reasonable reviews. Post
your comments and concerns to the mailing list and also enter your issues you
want to be _addressed/resolved_ into the issue tracker.


- Jouni & Mauricio

From lionel.morand@orange.com  Wed Jun  5 00:54:10 2013
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From: <lionel.morand@orange.com>
To: "radext@ietf.org" <radext@ietf.org>, "draft-ietf-radext-ieee802ext@tools.ietf.org" <draft-ietf-radext-ieee802ext@tools.ietf.org>, "bernard_aboba@hotmail.com" <bernard_aboba@hotmail.com>
Thread-Topic: [radext]  #153: Section 2.8 Access-Info
Thread-Index: AQHOSRufoRQbKm/tMkuHCkJO0q/VoZkm5kzg
Date: Wed, 5 Jun 2013 07:53:56 +0000
Message-ID: <27657_1370418838_51AEEE96_27657_5798_1_6B7134B31289DC4FAF731D844122B36E1FB0BA@PEXCVZYM13.corporate.adroot.infra.ftgroup>
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Subject: Re: [radext] #153: Section 2.8 Access-Info
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I'm not sure to understand this point.

As per section 10.1 in 802.1X, the access status indication is consecutive =
to an authentication procedure in any case.=20
So my assumption is that this status is valid for the duration of the sessi=
on. If any change is required, you need to restart a session.
Except if I have missed something...

Regards,

Lionel


-----Message d'origine-----
De=A0: radext-bounces@ietf.org [mailto:radext-bounces@ietf.org] De la part =
de radext issue tracker
Envoy=E9=A0: dimanche 5 mai 2013 00:52
=C0=A0: draft-ietf-radext-ieee802ext@tools.ietf.org; bernard_aboba@hotmail.=
com
Cc=A0: radext@ietf.org
Objet=A0: [radext] #153: Section 2.8 Access-Info

#153: Section 2.8 Access-Info

 The Access-Info Attribute is utilized by implementations of
       IEEE-802.1X [IEEE-802.1X] to specify the Access status information
       field within an Access Information Type Length Value Tuple (TLV)
       to be sent to the user within MACsec Key Agreement (MKA) or EAPoL-
       Announcement frames.

       A single Access-Info Attribute is permitted within a RADIUS
       Access-Accept, Access-Challenge, Access-Reject or Accounting-
       Request packet.

 [BA] The above paragraph seems to imply that the Access-Info Attribute
 could cause the Access status information to change during and after
 authentication.  It is unclear how supplicants would respond to such a
 change.  For example, the potential response to a change in MKA (which is
 authenticated) could be quite different from a change in an EAPoL-
 Announcement frame (which is not).  As a result, the desired behavior is
 unclear.

--=20
-------------------------------------+-------------------------------------
 Reporter:                           |      Owner:  draft-ietf-radext-
  bernard_aboba@hotmail.com          |  ieee802ext@tools.ietf.org
     Type:  defect                   |     Status:  new
 Priority:  critical                 |  Milestone:  milestone1
Component:  ieee802ext               |    Version:  1.0
 Severity:  In WG Last Call          |   Keywords:
-------------------------------------+-------------------------------------

Ticket URL: <http://wiki.tools.ietf.org/wg/radext/trac/ticket/153>
radext <http://tools.ietf.org/radext/>

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From lionel.morand@orange.com  Wed Jun  5 01:00:24 2013
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From: <lionel.morand@orange.com>
To: "radext@ietf.org" <radext@ietf.org>, "draft-ietf-radext-ieee802ext@tools.ietf.org" <draft-ietf-radext-ieee802ext@tools.ietf.org>, "bernard_aboba@hotmail.com" <bernard_aboba@hotmail.com>
Thread-Topic: [radext]  #154: Section 2.10 WLAN-HESSID
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Date: Wed, 5 Jun 2013 08:00:13 +0000
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Subject: Re: [radext] #154: Section 2.10 WLAN-HESSID
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For me, it is only a mistake.
The text should say:

"A single WLAN-HESSID Attribute is permitted within an Access-Request or Ac=
counting-Request packet."

Lionel

-----Message d'origine-----
De=A0: radext-bounces@ietf.org [mailto:radext-bounces@ietf.org] De la part =
de radext issue tracker
Envoy=E9=A0: dimanche 5 mai 2013 00:54
=C0=A0: draft-ietf-radext-ieee802ext@tools.ietf.org; bernard_aboba@hotmail.=
com
Cc=A0: radext@ietf.org
Objet=A0: [radext] #154: Section 2.10 WLAN-HESSID

#154: Section 2.10 WLAN-HESSID

 The WLAN-HESSID attribute contains a MAC address that identifies
       the Homogenous Extended Service Set. The HESSID is a globally
       unique identifier that in conjunction with the WLAN-SSID, may be
       used to provide network identification for a subscription service
       provider network (SSPN), as described in Section 8.4.2.94 of
       [IEEE-802.11].  A single WLAN-HESSID Attribute is permitted within
       an Access-Accept or Accounting-Request packet.

 [BA] The above text does not make it clear what a RADIUS client is
 supposed to do on receipt of a WLAN-HESSID within an Access-Accept.  Also,
 why would a WLAN-HESSID not be permitted within an Access-Request?

--=20
-------------------------------------+-------------------------------------
 Reporter:                           |      Owner:  draft-ietf-radext-
  bernard_aboba@hotmail.com          |  ieee802ext@tools.ietf.org
     Type:  defect                   |     Status:  new
 Priority:  critical                 |  Milestone:  milestone1
Component:  ieee802ext               |    Version:  1.0
 Severity:  In WG Last Call          |   Keywords:
-------------------------------------+-------------------------------------

Ticket URL: <http://wiki.tools.ietf.org/wg/radext/trac/ticket/154>
radext <http://tools.ietf.org/radext/>

_______________________________________________
radext mailing list
radext@ietf.org
https://www.ietf.org/mailman/listinfo/radext

___________________________________________________________________________=
______________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
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 ce message par erreur, veuillez le signaler
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ectroniques etant susceptibles d'alteration,
France Telecom - Orange decline toute responsabilite si ce message a ete al=
tere, deforme ou falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
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te this message and its attachments.
As emails may be altered, France Telecom - Orange is not liable for message=
s that have been modified, changed or falsified.
Thank you.


From trac+radext@trac.tools.ietf.org  Sat Jun  8 17:03:49 2013
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Subject: [radext]  #158: Section 1
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#158: Section 1

 When the NAI was defined for network access, it had the side effect
    of defining an identifier which could be used elsewhere.  Some
    systems which required the use of an identifier did so by leveraging
    the NAI.  This process simplified the management of credentials, by
    re-using the same credential in multiple situations.  We suggest that
    this re-use is good practice.  The alternative is to have protocol-
    specific identifiers, which increases cost to both user and
    administrator.


 [BA] I do not agree that the definition of the NAI in RFC 2486
 automatically defined the syntax of user identifiers used outside of
 network access.  Nor do I agree that the use of the NAI should be widely
 encouraged in other protocols. If this were valid then those other
 protocols would have referenced RFC 2486 for their user identity syntax,
 and they did not do so.  For example, SIP and HTTP do not reference the
 NAI, and I do not believe it is the goal of this document to redefine SIP,
 HTTP or any other protocol that uses RADIUS.  In any case, that is outside
 the scope of the RADEXT WG.

-- 
-------------------------------------+-------------------------------------
 Reporter:                           |      Owner:  draft-ietf-radext-
  bernard_aboba@hotmail.com          |  nai@tools.ietf.org
     Type:  defect                   |     Status:  new
 Priority:  blocker                  |  Milestone:  milestone1
Component:  nai                      |    Version:  1.0
 Severity:  In WG Last Call          |   Keywords:
-------------------------------------+-------------------------------------

Ticket URL: <http://wiki.tools.ietf.org/wg/radext/trac/ticket/158>
radext <http://tools.ietf.org/radext/>


From trac+radext@trac.tools.ietf.org  Sat Jun  8 17:07:54 2013
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#159: Section 1.3

 We also hope that other protocols can take advantage of the NAI.
    Many protocols include authentication capabilities.  The
    authentication credentials supplied in those protocols can end up
    being transported in AAA protocols.  It is therefore useful to define
    a representation of the user credentials which can be shared across
    multiple protocols.

 [BA] Again, this statement is overly broad.  The NAI is not utilized in a
 number of protocols (such as SIP and HTTP) which utilize AAA, so that we
 can't state categorically that the RADIUS User-Name attribute will
 necessarily contain an NAI in all cases.

-- 
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-------------------------------------+-------------------------------------

Ticket URL: <http://wiki.tools.ietf.org/wg/radext/trac/ticket/159>
radext <http://tools.ietf.org/radext/>


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#160: Section 2.1

 Systems MAY accept user identifiers in forms other than the NAI.
    This specification does not forbid that practice.  It only codifies
    the format and interpretation of the NAI.  Where protocols carry
    identifiers which are expected to be transported over an AAA
    protocol, it is RECOMMENDED that the identifiers be in NAI format.

 [BA] Implementations of PPP, EAP and other network access protocols do not
 normalize NAIs, and cannot be expected to do so going forward.  Therefore
 the recommendation does not make sense - and also AAA proxies and servers
 cannot expect NAIs to conform to the syntax in this document.

-- 
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-------------------------------------+-------------------------------------

Ticket URL: <http://wiki.tools.ietf.org/wg/radext/trac/ticket/160>
radext <http://tools.ietf.org/radext/>


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#161: Section 2.5

 * Realms MUST be of the form that can be registered as a
       Fully Qualified Domain Name (FQDN) within the DNS.

    This list is significantly shorter and simpler than the list in
    Section 2.4 of [RFC4282].  The form suggested in [RFC4282] depended
    on intermediate nodes performing canonicalizations based on
    insufficient information, which meant that the form was not
    canonical.  This document instead suggests (Section 2.10) that the
    realm owner provide a canonical form of the realm, and that all
    intermediate nodes use that form without modification.


 [BA] While RFC 2486 states that the rights to use an NAI realm derive from
 ownership of the FQDN, this does NOT imply that the realm need be
 normalized!  It only implies that the realm, when translated into A
 labels, can be registered.  This is not the same thing at all.

-- 
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 Severity:  In WG Last Call          |   Keywords:
-------------------------------------+-------------------------------------

Ticket URL: <http://wiki.tools.ietf.org/wg/radext/trac/ticket/161>
radext <http://tools.ietf.org/radext/>


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#162: Section 2.6

 2.6.  The Normalization Process

    Conversion to Unicode as well as normalization is expected to be
    performed by end systems that take "local" text as input.

 [BA] While conversion to Unicode is typically handled by end systems,
 normalization is not.

 Inside of an AAA system, NAIs are sent over
    the wire in their canonical form, and this canonical form is used for
    all NAI and/or realm comparisons.

 [BA] This does not follow from the statement that conversion to Unicode
 occurs on the end system.  Existing implementations typically will not
 normalize the NAI as advocated in this document, and as a result, AAA
 systems CANNOT assume that the NAI is in canonical form, or even that the
 contents of the User-Name attribute is in fact an NAI.

    In contrast to [RFC4282] Section 2.4, we expect AAA systems to
    perform NAI comparisons, matching, and AAA routing based on the NAI
    as it is received.

 [BA] Since the NAI will not be received in canonical form, NAI realm
 comparisons cannot be done this way.

 This specification provides a canonical
    representation, ensures that intermediate systems such as AAA proxies
    do not need to perform translations, and can be expected to work
    through systems that are unaware of international character sets.

 [BA] Unfortunately, this will not work, because end systems do not behave
 as described in this specification.

-- 
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 Severity:  In WG Last Call          |   Keywords:
-------------------------------------+-------------------------------------

Ticket URL: <http://wiki.tools.ietf.org/wg/radext/trac/ticket/162>
radext <http://tools.ietf.org/radext/>


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#163: Section 2.7

 transported as "fred@example%2Ecom", whereas the NAI for that user is
    "fred@example.com".  Any comparison, validation, or use of the NAI
    MUST be done on its un-escaped (i.e. utf8-clean) form.

 [BA] This statement, while making some amount of sense, contradicts the
 statement in Section 2.6, which is that the NAI is always normalized prior
 to entering the AAA system.

 Really, what needs to be done here is to create a section that specifies
 what steps need to be taken in comparing NAI realms. Conversion to the
 UTF8-clean form would be a first (but not the only step).

-- 
-------------------------------------+-------------------------------------
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-------------------------------------+-------------------------------------

Ticket URL: <http://wiki.tools.ietf.org/wg/radext/trac/ticket/163>
radext <http://tools.ietf.org/radext/>


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#164: Section 2.8

 Intermediate nodes MUST use the "utf8-realm" portion of the NAI
    without modification to perform this lookup.  Comparisons between the
    NAI as given in a AAA packet, and as provisioned in a logical AAA
    routing table SHOULD be done as a byte-for-byte equality test.  As
    noted earlier, intermediate nodes may not have access to the same
    locale information as the system which injected the NAI into the AAA
    routing systems.  Therefore, almost all "case insensitive"
    comparisons will be wrong.  Where the "utf8-realm" is entirely ASCII,
    current systems sometimes perform case-insensitive matching on
    realms.  This practice MAY be continued, as it has been shown to work
    in practice.

 [BA] Since realm names aren't normalized on entry to the AAA system, a
 byte-by-byte comparison won't work.

-- 
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-------------------------------------+-------------------------------------

Ticket URL: <http://wiki.tools.ietf.org/wg/radext/trac/ticket/164>
radext <http://tools.ietf.org/radext/>


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#165: Section 2.8

 We also note that many existing systems use user identifiers which
    are similar in format to the NAI, but which are not compliant with
    this specification.  For example, they may use non-NFC form, or they
    may have multiple "@" characters in the user identifier.
    Intermediate nodes MAY normalize non-NFC identifiers to NFC, prior to
    looking up the "utf8-realm" in the logical routing table.
    Intermediate nodes MUST NOT modify the identifiers that they forward.
    The data as entered by the user is inviolate.

 [BA] In fact, use of NFC in existing implementations is very rare, so rare
 that this specification simply cannot credibly require it.  Therefore the
 MAY for normalization here needs to be at least a SHOULD (or probably a
 MUST) before comparisons are done.

-- 
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 Severity:  In WG Last Call          |   Keywords:
-------------------------------------+-------------------------------------

Ticket URL: <http://wiki.tools.ietf.org/wg/radext/trac/ticket/165>
radext <http://tools.ietf.org/radext/>


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#166: Section 2.10

 Unlike DNS, the NAI does not make a
    distinction between A-labels and U-labels.  Is instead an IDNA-valid
    label, as per Section 2.3.2.1 of [RFC5890].

 [BA] The second sentence (which is incomplete) seems to contradict the
 first sentence.  Since a U-label is an IDNA-valid label, and the NAI does
 not require realms to be converted to A-labels, how can the NAI not make a
 distinction?

    There is, however, a problem with this approach.  A AAA proxy may not
    have sufficient information in order to perform the ToAscii
    conversion properly.  We therefore RECOMMEND that only the owner of
    the realm perform the ToAscii conversion.

 [BA] I don't understand why a AAA proxy cannot perform the ToAscii
 operation.  Since realms need to be FQDNs, they will be resolvable via
 DNS, not via mDNS, LLMNR, or NetBIOS.

-- 
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-------------------------------------+-------------------------------------

Ticket URL: <http://wiki.tools.ietf.org/wg/radext/trac/ticket/166>
radext <http://tools.ietf.org/radext/>


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#167: Section 2.12

 This section has no examples using internationalized realms.

-- 
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  bernard_aboba@hotmail.com          |  nai@tools.ietf.org
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-------------------------------------+-------------------------------------

Ticket URL: <http://wiki.tools.ietf.org/wg/radext/trac/ticket/167>
radext <http://tools.ietf.org/radext/>


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Subject: Re: [radext] #154: Section 2.10 WLAN-HESSID
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Lionel said:=20
> For me=2C it is only a mistake.
> The text should say:
>=20
> "A single WLAN-HESSID Attribute is permitted within an Access-Request or =
Accounting-Request packet."
>=20

[BA] It looks like a mistake to me.  Assuming no one objects=2C I will make=
 the above change.=20
 		 	   		  =

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<body class=3D'hmmessage'><div dir=3D'ltr'>Lionel said: <br>&gt=3B For me=
=2C it is only a mistake.<br>&gt=3B The text should say:<br>&gt=3B <br>&gt=
=3B "A single WLAN-HESSID Attribute is permitted within an Access-Request o=
r Accounting-Request packet."<br>&gt=3B <br><BR>[BA] It looks like a mistak=
e to me.&nbsp=3B Assuming no one objects=2C I will make the above change. <=
BR> 		 	   		  </div></body>
</html>=

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Subject: Re: [radext] #153: Section 2.8 Access-Info
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 Lionel said:=20

> I'm not sure to understand this point.
>=20
> As per section 10.1 in 802.1X=2C the access status indication is consecut=
ive to an authentication procedure in any case.=20
> So my assumption is that this status is valid for the duration of the ses=
sion. If any change is required=2C you need to restart a session.
> Except if I have missed something...

[BA] The document allows the Access-Info Attribute in an Access-Challenge p=
acket.  That doesn't seem compatible with "if any change is required you ne=
ed to restart a session"=2C because the value in an Access-Challenge could =
be different from that in an Access-Accept or Access-Reject.   Does inclusi=
on in an Access-Challenge really make sense?=20
 		 	   		  =

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<body class=3D'hmmessage'><div dir=3D'ltr'><br>&nbsp=3BLionel said: <BR><br=
>&gt=3B I'm not sure to understand this point.<br>&gt=3B <br>&gt=3B As per =
section 10.1 in 802.1X=2C the access status indication is consecutive to an=
 authentication procedure in any case. <br>&gt=3B So my assumption is that =
this status is valid for the duration of the session. If any change is requ=
ired=2C you need to restart a session.<br>&gt=3B Except if I have missed so=
mething...<br><BR>[BA] The document allows the Access-Info Attribute in an =
Access-Challenge packet.&nbsp=3B&nbsp=3BThat doesn't seem&nbsp=3Bcompatible=
 with&nbsp=3B"if any change is required you need to restart a session"=2C b=
ecause the value in an Access-Challenge could be different from that in an =
Access-Accept or Access-Reject.&nbsp=3B&nbsp=3B Does inclusion in an Access=
-Challenge really make sense? <BR> 		 	   		  </div></body>
</html>=

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Subject: [radext] Review of draft-ietf-radext-nai-03
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While the document now seems to recognize reality in several places=2C the =
recognition has not reflected itself uniformly in the normative statements.=
  So=2C overall=2C the draft contradicts itself in multiple places.=20
=20
For example=2C the document recognizes that existing network access client =
implementations don't normalize the NAI (e.g. don't use NFC)=2C so that nor=
malization by a AAA proxy MAY be required. =20
=20
At the same time=2C it insists that byte-by-byte comparisons be done on NAI=
 realms.=20
=20
Those two points of view aren't compatible with each other.   If we can't r=
ely on normalization by clients or NAS devices then AAA proxies doing realm=
 comparisons need to do normalization first or the comparisons won't be rel=
iable.  =20
=20
Another contradiction relates to the format of user identifiers used in non=
-network access protocols like SIP and HTTP.=20
=20
The document admits that they could use escaping=2C and won't normalize the=
 NAI as recommended prior to sending it.=20
=20
This of course implies that the escaped characters need to be converted pri=
or to comparison=2C which the document does note. =20
=20
But this contradicts the byte-by-byte comparison statements (as well as the=
 "normalize before sending" statement). =20
=20
It also seems to contradict the "use NAI in other protocols" recommendation=
=2C since we can't have an expectation that all protocols using AAA will ha=
ve user identities that conform to the NAI.=20
=20
Overall=2C my suggestion is that the document needs to re-think the approac=
h.=20
=20
While it is OK to require the NAI to be provided in UTF-8 form=2C  normaliz=
ation via NFC is so uncommon that requiring it to occur on the end host doe=
s not pass the smell test.=20
=20
Since it is unlikely that network access clients or NAS devices will change=
 their behavior=2C it seems to me that AAA proxies making realm comparisons=
 (e.g. for realm routing) need to be prepared to normalize the realms first=
.  The steps involved in doing this should be described in the document.=20
=20
Also=2C while I don't disagree with the statements made about "NAI decorati=
on" the term "deprecation" isn't explicitly used=2C though that seems clear=
ly to be what is meant.  So if we are really trying to put the decoration p=
ractice to bed=2C we should say so (like obsoleting the relevant documents)=
.=20
=20
=20
 		 	   		  =

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<body class=3D'hmmessage'><div dir=3D'ltr'>While the document now seems to =
recognize reality in several places=2C the recognition has not reflected it=
self uniformly in the normative statements.&nbsp=3B So=2C overall=2C the dr=
aft contradicts itself in multiple places.&nbsp=3B<BR>&nbsp=3B<BR>For examp=
le=2C the document recognizes that existing network access client&nbsp=3Bim=
plementations don't normalize the NAI (e.g. don't use NFC)=2C so that norma=
lization by a AAA proxy MAY be required.&nbsp=3B <BR>&nbsp=3B<BR>At the sam=
e time=2C it insists that byte-by-byte comparisons be done on NAI realms. <=
BR>&nbsp=3B<BR>Those two&nbsp=3Bpoints of view&nbsp=3Baren't compatible wit=
h each other.&nbsp=3B&nbsp=3B If we can't rely on normalization by clients =
or NAS devices then AAA proxies doing realm comparisons need to do normaliz=
ation first or the comparisons won't be reliable.&nbsp=3B&nbsp=3B <BR>&nbsp=
=3B<BR>Another contradiction relates to the format of user identifiers used=
 in non-network access protocols like SIP and HTTP. <BR>&nbsp=3B<BR>The doc=
ument admits that they could use escaping=2C and won't normalize the NAI as=
 recommended prior to sending it. <BR>&nbsp=3B<BR>This of course implies th=
at the escaped characters need to be converted prior to comparison=2C which=
 the document does note.&nbsp=3B <BR>&nbsp=3B<BR>But this contradicts the b=
yte-by-byte comparison statements (as well as the "normalize before sending=
" statement).&nbsp=3B <BR>&nbsp=3B<BR>It also seems to contradict the "use =
NAI in other protocols" recommendation=2C since we can't have an expectatio=
n that all protocols using AAA will have user identities that conform to th=
e NAI. <BR>&nbsp=3B<BR>Overall=2C my suggestion is that the document needs =
to re-think the approach. <BR>&nbsp=3B<BR>While it is OK to require the NAI=
 to be provided in UTF-8 form=2C&nbsp=3B normalization via NFC is so uncomm=
on that requiring it to occur on the end host does not pass the smell test.=
 <BR>&nbsp=3B<BR>Since it is unlikely that network access clients or NAS de=
vices will change their behavior=2C it seems to me that AAA proxies making =
realm comparisons (e.g. for realm routing) need to be prepared to normalize=
 the realms first.&nbsp=3B The steps involved in doing this should be descr=
ibed in the document. <BR>&nbsp=3B<BR>Also=2C while I don't disagree with t=
he statements made about "NAI decoration" the term "deprecation" isn't expl=
icitly used=2C though that seems clearly to be what is meant.&nbsp=3B So if=
 we are really trying to put the decoration practice to bed=2C we should sa=
y so (like obsoleting the relevant documents). <BR>&nbsp=3B<BR>&nbsp=3B<BR>=
 		 	   		  </div></body>
</html>=

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Subject: Re: [radext] #145: Allowable code points
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#145: Allowable code points

Changes (by bernard_aboba@hotmail.com):

 * component:  RFC4282bis => nai


-- 
-------------------------------------+-------------------------------------
 Reporter:                           |       Owner:
  bernard_aboba@hotmail.com          |  aland@deployingradius.com
     Type:  defect                   |      Status:  new
 Priority:  major                    |   Milestone:  milestone1
Component:  nai                      |     Version:  1.0
 Severity:  Candidate WG Document    |  Resolution:
 Keywords:                           |
-------------------------------------+-------------------------------------

Ticket URL: <http://wiki.tools.ietf.org/wg/radext/trac/ticket/145#comment:1>
radext <http://tools.ietf.org/radext/>


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#146: Terminology and RFC 6365

Changes (by bernard_aboba@hotmail.com):

 * component:  RFC4282bis => nai


-- 
-------------------------------------+-------------------------------------
 Reporter:                           |       Owner:
  bernard_aboba@hotmail.com          |  aland@deployingradius.com
     Type:  defect                   |      Status:  new
 Priority:  major                    |   Milestone:  milestone1
Component:  nai                      |     Version:  1.0
 Severity:  Candidate WG Document    |  Resolution:
 Keywords:                           |
-------------------------------------+-------------------------------------

Ticket URL: <http://wiki.tools.ietf.org/wg/radext/trac/ticket/146#comment:1>
radext <http://tools.ietf.org/radext/>


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#154: Section 2.10 WLAN-HESSID


Comment (by bernard_aboba@hotmail.com):

 Recommended fix:

 Change:

 "A single WLAN-HESSID Attribute is permitted within
  an Access-Accept or Accounting-Request packet."

 to:

 "A single WLAN-HESSID Attribute is permitted within
  an Access-Request or Accounting-Request packet."

-- 
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 Keywords:                           |
-------------------------------------+-------------------------------------

Ticket URL: <http://wiki.tools.ietf.org/wg/radext/trac/ticket/154#comment:1>
radext <http://tools.ietf.org/radext/>


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#154: Section 2.10 WLAN-HESSID

Changes (by bernard_aboba@hotmail.com):

 * status:  new => closed
 * resolution:   => fixed


-- 
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 Keywords:                           |
-------------------------------------+-------------------------------------

Ticket URL: <http://wiki.tools.ietf.org/wg/radext/trac/ticket/154#comment:2>
radext <http://tools.ietf.org/radext/>


From aland@deployingradius.com  Sat Jun  8 19:23:02 2013
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Bernard Aboba wrote:
> For example, the document recognizes that existing network access
> client implementations don't normalize the NAI (e.g. don't use NFC), so
> that normalization by a AAA proxy MAY be required. 
>  
> At the same time, it insists that byte-by-byte comparisons be done on
> NAI realms.

  It uses SHOULD, not MUST.

> Those two points of view aren't compatible with each other.   If we
> can't rely on normalization by clients or NAS devices then AAA proxies
> doing realm comparisons need to do normalization first or the
> comparisons won't be reliable.  

  Part of the issue here is that (a) the existing uses of user
identifiers are gratuitously incompatible, and (b) no one can agree on
how to fix it.

  This document tries to address the incompatibilities by suggesting the
format and use of a user identifier.  It builds on world-wide
deployments of NAI-like systems.  e.g. Eduroam.

  As the document says, all RADIUS systems seem to have ignored 4282's
recommendations for proxies to normalize the NAI.  The world hasn't
ended.  In fact, these methods have been proven to be wildly successful.

> Another contradiction relates to the format of user identifiers used in
> non-network access protocols like SIP and HTTP.
>  
> The document admits that they could use escaping, and won't normalize
> the NAI as recommended prior to sending it.

  When data is transported in a protocol like HTTP, it is escaped as per
the requirements of that protocol.  When the same data exits the
protocol, it is un-escaped.  i.e. the escaping matters only for HTTP
transport.  It is *transparent* to the data being transported.

  When I go to http://example.com/%69ndex.html, I may get served a file
off of the disk called "index.html".  By no means do I get server
"%69ndex.html"

  The name of the file exists outside of HTTP.  Any HTTP encoding of
that filename must stay within the HTTP protocol.

> This of course implies that the escaped characters need to be converted
> prior to comparison, which the document does note. 
>  
> But this contradicts the byte-by-byte comparison statements (as well as
> the "normalize before sending" statement). 

  No.  The "HTTP escaped NAI" is a blob of data being transported via
HTTP.  The NAI is the data that comes out of HTTP.  The only requirement
is that HTTP can transport the NAI.  There is no required that the "HTTP
escaped NAI" be used anywhere.

  In fact, the document tries to make clear that the "HTTP escaped NAI"
MUST NOT be used anywhere.  It's not the NAI.

> It also seems to contradict the "use NAI in other protocols"
> recommendation, since we can't have an expectation that all protocols
> using AAA will have user identities that conform to the NAI.

  Sort of.  The NAI can be transported in other protocols.  It is hoped
that protocols will share common user identifiers.  Where they don't, we
have potential for accounting problems, security breaches, etc.

> Overall, my suggestion is that the document needs to re-think the approach.

  The approach the document takes is not the one you're describing.

> While it is OK to require the NAI to be provided in UTF-8 form, 
> normalization via NFC is so uncommon that requiring it to occur on the
> end host does not pass the smell test.

  It has to occur somewhere.  End hosts don't do it.  AAA proxies don't
do it.  *Any* place we pick is arguably wrong.

  Therefore, we need to find reasons to pick one place over another.
The document describes it's current reasons.

> Since it is unlikely that network access clients or NAS devices will
> change their behavior, it seems to me that AAA proxies making realm
> comparisons (e.g. for realm routing) need to be prepared to normalize
> the realms first.  The steps involved in doing this should be described
> in the document.

  I'm fine with that.  If there's WG consensus, we can change the document.

  Do you have suggested text?

> Also, while I don't disagree with the statements made about "NAI
> decoration" the term "deprecation" isn't explicitly used, though that
> seems clearly to be what is meant.  So if we are really trying to put
> the decoration practice to bed, we should say so (like obsoleting the
> relevant documents).

  I'm fine with that.

  Alan DeKok.

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> Bernard Aboba wrote:
> > For example=2C the document recognizes that existing network access
> > client implementations don't normalize the NAI (e.g. don't use NFC)=2C =
so
> > that normalization by a AAA proxy MAY be required.=20
> > =20
> > At the same time=2C it insists that byte-by-byte comparisons be done on
> > NAI realms.
>=20
>   It uses SHOULD=2C not MUST.
=20
[BA] If you can't depend on the contents of the User-Name attribute being n=
ormalized=2C then I don't think you can recommend byte-by-byte comparison=
=2C because it won't work reliably.   Perhaps the only reason we haven't be=
en bitten by this already is because there are so many internationalization=
 problems in existing implementations that internationalized NAIs aren't us=
ed that often.=20


>   Part of the issue here is that (a) the existing uses of user
> identifiers are gratuitously incompatible=2C and (b) no one can agree on
> how to fix it.
=20
[BA] While you're probably right about that=2C I don't think we need to bit=
e off all of the problem in this document.  All we are really trying to do =
is address the misconceptions of RFC 4282=2C to prevent it from doing furth=
er damage.   The document is very close to accomplishing that=2C but it is =
simultaneously also trying to fight other dragons.=20
=20
My personal preference would be for us to remove material not related to th=
e NAI into a (separate) document=2C which could also describe what existing=
 implementations do and make some recommendations for network access and RA=
DIUS implementations.    =20


>   As the document says=2C all RADIUS systems seem to have ignored 4282's
> recommendations for proxies to normalize the NAI.  The world hasn't
> ended.  In fact=2C these methods have been proven to be wildly successful=
.

[BA] It is indeed cheerful to consider how widely ignored RFC 4282 is.  But=
 I wonder whether it is ignored because people realized it was nonsense=2C =
or because they hadn't encountered enough internalized NAIs to notice how n=
onsensical it was.=20

>   When data is transported in a protocol like HTTP=2C it is escaped as pe=
r
> the requirements of that protocol.  When the same data exits the
> protocol=2C it is un-escaped.  i.e. the escaping matters only for HTTP
> transport.  It is *transparent* to the data being transported.

[BA]  My question was whether "escaped"  NAIs ever show up in the RADIUS Us=
er-Name attribute=2C say in RFC 5090 implementations.  Reading the RFC 5090=
 examples=2C the User-Name attribute seems to have a bogus value (e.g. "123=
45678")=2C so it's not clear to me what is going on.  =20
=20
Speaking of which=2C are there any RFC 5090 implementations? =20
=20
The other place this could potentially come up is in other application-laye=
r usages (e.g. ABFAB).  But I don't know enough about how those do (or shou=
ld) work.=20

>   The name of the file exists outside of HTTP.  Any HTTP encoding of
> that filename must stay within the HTTP protocol.

[BA]  Re-reading RFC 5090=2C it isn't clear to me whether the HTTP or SIP e=
ncoding will leak into RADIUS or not.  But I guess the only place where the=
 leak would be relevant is the User-Name attribute=2C because attributes li=
ke the "Digest-Realm" Attribute don't contain an NAI realm (and aren't used=
 for routing). =20

>   In fact=2C the document tries to make clear that the "HTTP escaped NAI"
> MUST NOT be used anywhere.  It's not the NAI.
=20
[BA] I agree that it isn't an NAI.  And in reading RFC 5090 it seems like H=
TTP/SIP input wouldn't affect the User-Name attribute where an NAI would be=
 expected to be.  But I'm not sure=2C because I've never seen an RFC 5090 i=
mplementation to know for certain.=20
=20
>   Sort of.  The NAI can be transported in other protocols.  It is hoped
> that protocols will share common user identifiers.  Where they don't=2C w=
e
> have potential for accounting problems=2C security breaches=2C etc.
=20
Aside from network access protocols (e.g. PPP=2C EAP=2C IKEv2=2C L2TP=2C et=
c.) and AAA protocols (RADIUS=2C Diameter) what other protocols can transpo=
rt NAIs? =20
=20
Also=2C if an application layer protocol uses an identifier that isn't an N=
AI=2C I am wondering whether we shouldn't require that this identifier NOT =
be placed in the RADIUS User-Name attribute so that it won't confuse things=
 further.  Reading RFC 5090=2C I'm half convinced that we missed a bullet t=
here (particularly if it wasn't implemented). =20

>   It has to occur somewhere.  End hosts don't do it.  AAA proxies don't
> do it.  *Any* place we pick is arguably wrong.

[BA] I don't think it's a question of "wrong"=2C but more of a question of =
"what is easiest to deploy?"  Getting changes made to old clients is really=
=2C really hard.   Similarly=2C trying to get a patch to a NAS is gonna be =
tough.  AAA proxies probably aren't that easy to fix either but there are t=
ypically fewer of them than clients or NASen.=20

>   Do you have suggested text?
=20
[BA] I can find some=2C assuming we agree on the scope and direction.=20
 		 	   		  =

--_f3c90eff-8da3-4c4c-bfbf-cc1af799bde6_
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<body class=3D'hmmessage'><div dir=3D'ltr'>&gt=3B Bernard Aboba wrote:<br>&=
gt=3B &gt=3B For example=2C the document recognizes that existing network a=
ccess<br>&gt=3B &gt=3B client implementations don't normalize the NAI (e.g.=
 don't use NFC)=2C so<br>&gt=3B &gt=3B that normalization by a AAA proxy MA=
Y be required. <br>&gt=3B &gt=3B  <br>&gt=3B &gt=3B At the same time=2C it =
insists that byte-by-byte comparisons be done on<br>&gt=3B &gt=3B NAI realm=
s.<br>&gt=3B <br>&gt=3B   It uses SHOULD=2C not MUST.<BR>&nbsp=3B<BR>[BA] I=
f you can't depend on the contents of the User-Name attribute being normali=
zed=2C then I don't think you can recommend byte-by-byte comparison=2C beca=
use it won't work reliably.&nbsp=3B&nbsp=3B Perhaps the only reason we have=
n't been bitten by this already is because there are so many internationali=
zation problems in existing implementations that internationalized NAIs are=
n't used that often. <BR><br><br>&gt=3B   Part of the issue here is that (a=
) the existing uses of user<br>&gt=3B identifiers are gratuitously incompat=
ible=2C and (b) no one can agree on<br>&gt=3B how to fix it.<BR>&nbsp=3B<BR=
>[BA] While you're probably right about that=2C I don't think we need to bi=
te off all of the problem in this document.&nbsp=3B All we are really tryin=
g to do is address the misconceptions of RFC 4282=2C to prevent it from doi=
ng further damage.&nbsp=3B&nbsp=3B The document is very close to accomplish=
ing that=2C but it is simultaneously also trying to fight other dragons. <B=
R>&nbsp=3B<BR>My personal preference would be for us to remove material not=
 related to the NAI into a (separate) document=2C which could also describe=
 what existing implementations do and make some recommendations for network=
 access and RADIUS implementations.&nbsp=3B&nbsp=3B &nbsp=3B <BR><br><br>&g=
t=3B   As the document says=2C all RADIUS systems seem to have ignored 4282=
's<br>&gt=3B recommendations for proxies to normalize the NAI.  The world h=
asn't<br>&gt=3B ended.  In fact=2C these methods have been proven to be wil=
dly successful.<br><BR>[BA] It is indeed cheerful to consider how widely ig=
nored RFC 4282 is.&nbsp=3B But I wonder whether it is ignored because peopl=
e realized it was nonsense=2C or because they hadn't encountered enough int=
ernalized NAIs to notice how nonsensical it was. <BR><br>&gt=3B   When data=
 is transported in a protocol like HTTP=2C it is escaped as per<br>&gt=3B t=
he requirements of that protocol.  When the same data exits the<br>&gt=3B p=
rotocol=2C it is un-escaped.  i.e. the escaping matters only for HTTP<br>&g=
t=3B transport.  It is *transparent* to the data being transported.<br><BR>=
[BA]&nbsp=3B My question&nbsp=3Bwas&nbsp=3Bwhether "escaped"&nbsp=3B NAIs e=
ver show up in the RADIUS User-Name attribute=2C say&nbsp=3Bin RFC 5090 imp=
lementations.&nbsp=3B Reading the RFC 5090 examples=2C the User-Name attrib=
ute seems to have a bogus value (e.g. "12345678")=2C&nbsp=3Bso it's not cle=
ar to me&nbsp=3Bwhat is going on. &nbsp=3B <BR>&nbsp=3B<BR>Speaking of whic=
h=2C are there any RFC 5090 implementations?&nbsp=3B <BR>&nbsp=3B<BR>The ot=
her place this could potentially come up is in other application-layer usag=
es (e.g. ABFAB).&nbsp=3B But I don't know enough about how those do (or sho=
uld) work. <BR><br>&gt=3B   The name of the file exists outside of HTTP.  A=
ny HTTP encoding of<br>&gt=3B that filename must stay within the HTTP proto=
col.<br><BR>[BA]&nbsp=3B Re-reading RFC 5090=2C it isn't clear to me whethe=
r the HTTP or SIP encoding will leak into RADIUS or not.&nbsp=3B But I gues=
s the only place where the leak would be relevant is the User-Name attribut=
e=2C because attributes like the "Digest-Realm" Attribute don't contain an =
NAI realm (and aren't used for routing).&nbsp=3B <BR><br>&gt=3B   In fact=
=2C the document tries to make clear that the "HTTP escaped NAI"<br>&gt=3B =
MUST NOT be used anywhere.  It's not the NAI.<BR>&nbsp=3B<BR>[BA] I agree t=
hat it isn't an NAI.&nbsp=3B And in reading RFC 5090 it seems like HTTP/SIP=
 input wouldn't affect the User-Name attribute where an NAI would be expect=
ed to be.&nbsp=3B But I'm not sure=2C because I've never seen an RFC 5090 i=
mplementation to know for certain. <BR>&nbsp=3B<br>&gt=3B   Sort of.  The N=
AI can be transported in other protocols.  It is hoped<br>&gt=3B that proto=
cols will share common user identifiers.  Where they don't=2C we<br>&gt=3B =
have potential for accounting problems=2C security breaches=2C etc.<BR>&nbs=
p=3B<BR>Aside from network access protocols (e.g. PPP=2C EAP=2C IKEv2=2C L2=
TP=2C etc.) and AAA protocols (RADIUS=2C Diameter) what other protocols can=
 transport NAIs?&nbsp=3B <BR>&nbsp=3B<BR>Also=2C if an application layer pr=
otocol uses an identifier that isn't an NAI=2C I am wondering whether we sh=
ouldn't require that this identifier NOT be placed in the RADIUS User-Name =
attribute so that it won't confuse things further.&nbsp=3B Reading RFC 5090=
=2C I'm half convinced that we missed a bullet there (particularly if it wa=
sn't implemented).&nbsp=3B <BR><br>&gt=3B   It has to occur somewhere.  End=
 hosts don't do it.  AAA proxies don't<br>&gt=3B do it.  *Any* place we pic=
k is arguably wrong.<br><BR>[BA] I don't think it's a question of "wrong"=
=2C but more of a question of "what is easiest to deploy?"&nbsp=3B Getting =
changes made to old clients is really=2C really hard.&nbsp=3B&nbsp=3B Simil=
arly=2C trying to get a patch to a NAS is gonna be tough.&nbsp=3B AAA proxi=
es probably aren't that easy to fix either but there are typically fewer of=
 them than clients or NASen. <BR><br>&gt=3B   Do you have suggested text?<B=
R>&nbsp=3B<BR>[BA] I can find some=2C assuming we agree on the scope and di=
rection. <BR> 		 	   		  </div></body>
</html>=

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From lionel.morand@orange.com  Sun Jun  9 02:18:41 2013
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From: <lionel.morand@orange.com>
To: Bernard Aboba <bernard_aboba@hotmail.com>, "radext@ietf.org" <radext@ietf.org>, "draft-ietf-radext-ieee802ext@tools.ietf.org" <draft-ietf-radext-ieee802ext@tools.ietf.org>
Thread-Topic: [radext] #153: Section 2.8 Access-Info
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Date: Sun, 9 Jun 2013 09:18:29 +0000
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Subject: Re: [radext] #153: Section 2.8 Access-Info
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I had the same concern. Not sure that this info in the Access-Challenge mak=
es sense.

Lionel

De : Bernard Aboba [mailto:bernard_aboba@hotmail.com]
Envoy=E9 : dimanche 9 juin 2013 02:52
=C0 : MORAND Lionel OLNC/OLN; radext@ietf.org; draft-ietf-radext-ieee802ext=
@tools.ietf.org
Objet : RE: [radext] #153: Section 2.8 Access-Info


 Lionel said:

> I'm not sure to understand this point.
>
> As per section 10.1 in 802.1X, the access status indication is consecutiv=
e to an authentication procedure in any case.
> So my assumption is that this status is valid for the duration of the ses=
sion. If any change is required, you need to restart a session.
> Except if I have missed something...

[BA] The document allows the Access-Info Attribute in an Access-Challenge p=
acket.  That doesn't seem compatible with "if any change is required you ne=
ed to restart a session", because the value in an Access-Challenge could be=
 different from that in an Access-Accept or Access-Reject.   Does inclusion=
 in an Access-Challenge really make sense?

___________________________________________________________________________=
______________________________________________

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<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;
color:#1F497D">I had the same concern. Not sure that this info in the Acces=
s-Challenge makes sense.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;
color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;
color:#1F497D">Lionel<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;
color:#1F497D"><o:p>&nbsp;</o:p></span></p>
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<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">De&nbsp;:</span></b><span style=3D"fo=
nt-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> Bern=
ard Aboba [mailto:bernard_aboba@hotmail.com]
<br>
<b>Envoy=E9&nbsp;:</b> dimanche 9 juin 2013 02:52<br>
<b>=C0&nbsp;:</b> MORAND Lionel OLNC/OLN; radext@ietf.org; draft-ietf-radex=
t-ieee802ext@tools.ietf.org<br>
<b>Objet&nbsp;:</b> RE: [radext] #153: Section 2.8 Access-Info<o:p></o:p></=
span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Calibri&quot;,&quot=
;sans-serif&quot;"><br>
&nbsp;Lionel said: <br>
<br>
&gt; I'm not sure to understand this point.<br>
&gt; <br>
&gt; As per section 10.1 in 802.1X, the access status indication is consecu=
tive to an authentication procedure in any case.
<br>
&gt; So my assumption is that this status is valid for the duration of the =
session. If any change is required, you need to restart a session.<br>
&gt; Except if I have missed something...<br>
<br>
[BA] The document allows the Access-Info Attribute in an Access-Challenge p=
acket.&nbsp;&nbsp;That doesn't seem&nbsp;compatible with&nbsp;&quot;if any =
change is required you need to restart a session&quot;, because the value i=
n an Access-Challenge could be different from that in an Access-Accept
 or Access-Reject.&nbsp;&nbsp; Does inclusion in an Access-Challenge really=
 make sense? <o:p>
</o:p></span></p>
</div>
</div>
<PRE>______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
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 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,
France Telecom - Orange decline toute responsabilite si ce message a ete al=
tere, deforme ou falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, France Telecom - Orange is not liable for message=
s that have been modified, changed or falsified.
Thank you.
</PRE></body>
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Subject: Re: [radext] Review of draft-ietf-radext-nai-03
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Bernard Aboba wrote:
> [BA] If you can't depend on the contents of the User-Name attribute
> being normalized, then I don't think you can recommend byte-by-byte
> comparison, because it won't work reliably.   Perhaps the only reason we
> haven't been bitten by this already is because there are so many
> internationalization problems in existing implementations that
> internationalized NAIs aren't used that often.

  The document is consistent in that it suggests end hosts should
normalize the NAI.  Proxies can then do byte-by-byte comparisons.

  And I agree that i18n issues largely haven't come up.  Where I've seen
them occur, people use non-UTF8 character sets, and don't do roaming.

> [BA] While you're probably right about that, I don't think we need to
> bite off all of the problem in this document.  All we are really trying
> to do is address the misconceptions of RFC 4282, to prevent it from
> doing further damage.   The document is very close to accomplishing
> that, but it is simultaneously also trying to fight other dragons.

  It's a bit pointless to define an NAI without suggested uses.

> [BA] It is indeed cheerful to consider how widely ignored RFC 4282 is. 
> But I wonder whether it is ignored because people realized it was
> nonsense, or because they hadn't encountered enough internalized NAIs to
> notice how nonsensical it was.

  A bit of both, I think.

> [BA]  My question was whether "escaped"  NAIs ever show up in the RADIUS
> User-Name attribute,

  Never never never never never.  I hope I'm being clear on that. :)

> Speaking of which, are there any RFC 5090 implementations? 

  I've heard of one from a minor switch vendor.

> [BA] I agree that it isn't an NAI.  And in reading RFC 5090 it seems
> like HTTP/SIP input wouldn't affect the User-Name attribute where an NAI
> would be expected to be.  But I'm not sure, because I've never seen an
> RFC 5090 implementation to know for certain.

  The point for me is "user identifier" is a separate concept from "how
user identifier is transported in a protocol".  For RADIUS, they're the
same, because it's UTF8-clean.  HTTP isn't, so it escapes characters
during transport.

> Aside from network access protocols (e.g. PPP, EAP, IKEv2, L2TP, etc.)
> and AAA protocols (RADIUS, Diameter) what other protocols can transport
> NAIs? 

  IMHO, any protocol which requires user identifiers.

  It's ridiculous that each protocol has its own format for user
identifiers.

> Also, if an application layer protocol uses an identifier that isn't an
> NAI, I am wondering whether we shouldn't require that this identifier
> NOT be placed in the RADIUS User-Name attribute so that it won't confuse
> things further.  Reading RFC 5090, I'm half convinced that we missed a
> bullet there (particularly if it wasn't implemented). 

  Spreading the rot from other protocols into RADIUS isn't a good idea.
 If the other protocol thinks it's a user identifier, it should go into
the RADIUS User-Name attribute.

  It's then up to the RADIUS server to decide it's not an NAI, and then
to do whatever ad-hoc nonsense is necessary in order to authenticate the
users.

  Alan DeKok.

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Subject: Re: [radext] #158: Section 1
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#158: Section 1

Changes (by aland@deployingradius.com):

 * status:  new => closed
 * resolution:   => invalid


Comment:

 The document says "could" be used elsewhere.  It doesn't say that it
 mandated a definition for the identifiers used in other protocols.

-- 
-------------------------------------+-------------------------------------
 Reporter:                           |       Owner:  draft-ietf-radext-
  bernard_aboba@hotmail.com          |  nai@tools.ietf.org
     Type:  defect                   |      Status:  closed
 Priority:  blocker                  |   Milestone:  milestone1
Component:  nai                      |     Version:  1.0
 Severity:  In WG Last Call          |  Resolution:  invalid
 Keywords:                           |
-------------------------------------+-------------------------------------

Ticket URL: <http://trac.tools.ietf.org/wg/radext/trac/ticket/158#comment:1>
radext <http://tools.ietf.org/radext/>


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Subject: Re: [radext] #159: Section 1.3
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#159: Section 1.3

Changes (by aland@deployingradius.com):

 * status:  new => closed
 * resolution:   => invalid


Comment:

 The document makes it clear that a RADIUS User-Name will not always
 contain an NAI.  It recognizes that other protocols do not currently use
 the NAI for user identifiers.  It suggests that using a common identifier
 is preferable to have identifiers which are protocol-specific.

-- 
-------------------------------------+-------------------------------------
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  bernard_aboba@hotmail.com          |  nai@tools.ietf.org
     Type:  defect                   |      Status:  closed
 Priority:  blocker                  |   Milestone:  milestone1
Component:  nai                      |     Version:
 Severity:  In WG Last Call          |  Resolution:  invalid
 Keywords:                           |
-------------------------------------+-------------------------------------

Ticket URL: <http://trac.tools.ietf.org/wg/radext/trac/ticket/159#comment:1>
radext <http://tools.ietf.org/radext/>


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#160: Section 2.1

Changes (by aland@deployingradius.com):

 * status:  new => closed
 * resolution:   => invalid


Comment:

 The first sentence of the quoted text addresses your concern in your first
 sentence.

 Many uses of PPP, EAP, and other network access protocols do allow an NAI
 to be transported.  This document tries to say that using the NAI is
 preferable to using a gratuitously incompatible user identifier.

-- 
-------------------------------------+-------------------------------------
 Reporter:                           |       Owner:  draft-ietf-radext-
  bernard_aboba@hotmail.com          |  nai@tools.ietf.org
     Type:  defect                   |      Status:  closed
 Priority:  critical                 |   Milestone:  milestone1
Component:  nai                      |     Version:  1.0
 Severity:  In WG Last Call          |  Resolution:  invalid
 Keywords:                           |
-------------------------------------+-------------------------------------

Ticket URL: <http://trac.tools.ietf.org/wg/radext/trac/ticket/160#comment:1>
radext <http://tools.ietf.org/radext/>


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#161: Section 2.5

Changes (by aland@deployingradius.com):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 The text here is about registration, and does not require the realm to be
 normalized.

 The reference to Section 2.10 is perhaps what is confusing.  2.10 talks
 about proxies comparing input realms to pre-configured "known" realms.
 Those pre-configured realms should be supplied to the proxy by the realm
 owner in a normalized form.

 The simplest thing is to remove the sentence referring to 2.10.  It's
 unnecessary for the definition of the realm.

-- 
-------------------------------------+-------------------------------------
 Reporter:                           |       Owner:  draft-ietf-radext-
  bernard_aboba@hotmail.com          |  nai@tools.ietf.org
     Type:  defect                   |      Status:  closed
 Priority:  critical                 |   Milestone:  milestone1
Component:  nai                      |     Version:
 Severity:  In WG Last Call          |  Resolution:  fixed
 Keywords:                           |
-------------------------------------+-------------------------------------

Ticket URL: <http://trac.tools.ietf.org/wg/radext/trac/ticket/161#comment:1>
radext <http://tools.ietf.org/radext/>


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Subject: Re: [radext] #163: Section 2.7
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#163: Section 2.7

Changes (by aland@deployingradius.com):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 There is no contradiction.  The concept of "normalization" applies to
 taking unicode strings, and converting them to a NFC form.

 The concept of "escaping" applies to protocols which are not 8-bit clean,
 and which require certain input byte sequences to be replaced by other
 byte sequences prior to transport..

 Conversion to the UTF8-clean form is a process which is specific to each
 protocol.  e.g. data coming *out* of HTTP is un-escaped, according to the
 HTTP rules.  But that process is done by the HTTP layer.  The AAA layer
 has no idea where the NAI came from, and doesn't care.

 I'll clarify that in the document.

-- 
-------------------------------------+-------------------------------------
 Reporter:                           |       Owner:  draft-ietf-radext-
  bernard_aboba@hotmail.com          |  nai@tools.ietf.org
     Type:  defect                   |      Status:  closed
 Priority:  critical                 |   Milestone:  milestone1
Component:  nai                      |     Version:  1.0
 Severity:  In WG Last Call          |  Resolution:  fixed
 Keywords:                           |
-------------------------------------+-------------------------------------

Ticket URL: <http://trac.tools.ietf.org/wg/radext/trac/ticket/163#comment:1>
radext <http://tools.ietf.org/radext/>


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Subject: Re: [radext] #166: Section 2.10
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#166: Section 2.10

Changes (by aland@deployingradius.com):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 RFC 5890 defines an IDNA-valid label as encompassing both A-label and
 U-label.

 An A-label is solely ASCII.  A U-label contains at least one non-ASCII
 character.

 Both of the terms A-label and U-label are specific to DNS.  They are a
 historical artifact of the DNS protocol, and don't belong in a modern
 international-aware NAI.

 > I don't understand why a AAA proxy cannot perform the ToAscii? operation

 I think that text is left over from an earlier version of the document,
 when it wasn't clear what was necessary for i18n.  That has since been
 clarified.  I'll update the text.

-- 
-------------------------------------+-------------------------------------
 Reporter:                           |       Owner:  draft-ietf-radext-
  bernard_aboba@hotmail.com          |  nai@tools.ietf.org
     Type:  defect                   |      Status:  closed
 Priority:  critical                 |   Milestone:  milestone1
Component:  nai                      |     Version:  1.0
 Severity:  In WG Last Call          |  Resolution:  fixed
 Keywords:                           |
-------------------------------------+-------------------------------------

Ticket URL: <http://trac.tools.ietf.org/wg/radext/trac/ticket/166#comment:1>
radext <http://tools.ietf.org/radext/>


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_______________________________________________
radext mailing list
radext@ietf.org
https://www.ietf.org/mailman/listinfo/radext

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Subject: Re: [radext] #165: Section 2.8
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#165: Section 2.8

Changes (by aland@deployingradius.com):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 Done.

-- 
-------------------------------------+-------------------------------------
 Reporter:                           |       Owner:  draft-ietf-radext-
  bernard_aboba@hotmail.com          |  nai@tools.ietf.org
     Type:  defect                   |      Status:  closed
 Priority:  major                    |   Milestone:  milestone1
Component:  nai                      |     Version:  1.0
 Severity:  In WG Last Call          |  Resolution:  fixed
 Keywords:                           |
-------------------------------------+-------------------------------------

Ticket URL: <http://trac.tools.ietf.org/wg/radext/trac/ticket/165#comment:1>
radext <http://tools.ietf.org/radext/>


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Subject: [radext] I-D Action: draft-ietf-radext-ieee802ext-07.txt
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A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
 This draft is a work item of the RADIUS EXTensions Working Group of the IE=
TF.

	Title           : RADIUS Attributes for IEEE 802 Networks
	Author(s)       : Bernard Aboba
                          Jouni Malinen
                          Paul Congdon
                          Joseph Salowey
                          Mark Jones
	Filename        : draft-ietf-radext-ieee802ext-07.txt
	Pages           : 30
	Date            : 2013-06-09

Abstract:
   RFC 3580 provides guidelines for the use of the Remote Authentication
   Dialin User Service (RADIUS) within IEEE 802 local area networks
   (LANs).  This document proposes additional attributes for use within
   IEEE 802 networks, as well as clarifications on the usage of the EAP-
   Key-Name attribute, updating RFC 4072.  The attributes defined in
   this document are usable both within RADIUS and Diameter.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-radext-ieee802ext

There's also a htmlized version available at:
http://tools.ietf.org/html/draft-ietf-radext-ieee802ext-07

A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-radext-ieee802ext-07


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


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#153: Section 2.8 Access-Info


Comment (by bernard_aboba@hotmail.com):

 Proposed fix:

 Change:

 "A single Access-Info Attribute is permitted within a RADIUS
 Access-Accept, Access-Challenge, Access-Reject or Accounting-
 Request packet."

 To:

 "A single Access-Info Attribute is permitted within a RADIUS
 Access-Accept, Access-Reject or Accounting-Request packet."

 Also, change the table entry under Access-Challenge from 0-1 to 0.

-- 
-------------------------------------+-------------------------------------
 Reporter:                           |       Owner:  draft-ietf-radext-
  bernard_aboba@hotmail.com          |  ieee802ext@tools.ietf.org
     Type:  defect                   |      Status:  new
 Priority:  critical                 |   Milestone:  milestone1
Component:  ieee802ext               |     Version:  1.0
 Severity:  In WG Last Call          |  Resolution:
 Keywords:                           |
-------------------------------------+-------------------------------------

Ticket URL: <http://trac.tools.ietf.org/wg/radext/trac/ticket/153#comment:1>
radext <http://tools.ietf.org/radext/>


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#153: Section 2.8 Access-Info

Changes (by bernard_aboba@hotmail.com):

 * status:  new => closed
 * resolution:   => fixed


-- 
-------------------------------------+-------------------------------------
 Reporter:                           |       Owner:  draft-ietf-radext-
  bernard_aboba@hotmail.com          |  ieee802ext@tools.ietf.org
     Type:  defect                   |      Status:  closed
 Priority:  critical                 |   Milestone:  milestone1
Component:  ieee802ext               |     Version:  1.0
 Severity:  In WG Last Call          |  Resolution:  fixed
 Keywords:                           |
-------------------------------------+-------------------------------------

Ticket URL: <http://trac.tools.ietf.org/wg/radext/trac/ticket/153#comment:2>
radext <http://tools.ietf.org/radext/>


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With -07=2C I believe that all the issues raised during WG last call have b=
een resolved.=20
Of course=2C it is possible that the issues have not been resolved correctl=
y=2C or that there are other issues that haven't been found yet.=20
So please... take a look at -07 and post any issues in TRAC.=20

> From: internet-drafts@ietf.org
> To: i-d-announce@ietf.org
> Date: Sun=2C 9 Jun 2013 09:15:21 -0700
> CC: radext@ietf.org
> Subject: [radext] I-D Action: draft-ietf-radext-ieee802ext-07.txt
>=20
>=20
> A New Internet-Draft is available from the on-line Internet-Drafts direct=
ories.
>  This draft is a work item of the RADIUS EXTensions Working Group of the =
IETF.
>=20
> 	Title           : RADIUS Attributes for IEEE 802 Networks
> 	Author(s)       : Bernard Aboba
>                           Jouni Malinen
>                           Paul Congdon
>                           Joseph Salowey
>                           Mark Jones
> 	Filename        : draft-ietf-radext-ieee802ext-07.txt
> 	Pages           : 30
> 	Date            : 2013-06-09
>=20
> Abstract:
>    RFC 3580 provides guidelines for the use of the Remote Authentication
>    Dialin User Service (RADIUS) within IEEE 802 local area networks
>    (LANs).  This document proposes additional attributes for use within
>    IEEE 802 networks=2C as well as clarifications on the usage of the EAP=
-
>    Key-Name attribute=2C updating RFC 4072.  The attributes defined in
>    this document are usable both within RADIUS and Diameter.
>=20
>=20
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-radext-ieee802ext
>=20
> There's also a htmlized version available at:
> http://tools.ietf.org/html/draft-ietf-radext-ieee802ext-07
>=20
> A diff from the previous version is available at:
> http://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-radext-ieee802ext-07
>=20
>=20
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>=20
> _______________________________________________
> radext mailing list
> radext@ietf.org
> https://www.ietf.org/mailman/listinfo/radext
 		 	   		  =

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<html>
<head>
<style><!--
.hmmessage P
{
margin:0px=3B
padding:0px
}
body.hmmessage
{
font-size: 12pt=3B
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<body class=3D'hmmessage'><div dir=3D'ltr'>With -07=2C I believe that all t=
he issues raised during WG last call have been resolved.&nbsp=3B<div><br></=
div><div>Of course=2C it is possible that the issues have not been resolved=
 correctly=2C or that there are other issues that haven't been found yet.&n=
bsp=3B</div><div><br></div><div>So please... take a look at -07 and post an=
y issues in TRAC.&nbsp=3B<br><br><div>&gt=3B From: internet-drafts@ietf.org=
<br>&gt=3B To: i-d-announce@ietf.org<br>&gt=3B Date: Sun=2C 9 Jun 2013 09:1=
5:21 -0700<br>&gt=3B CC: radext@ietf.org<br>&gt=3B Subject: [radext] I-D Ac=
tion: draft-ietf-radext-ieee802ext-07.txt<br>&gt=3B <br>&gt=3B <br>&gt=3B A=
 New Internet-Draft is available from the on-line Internet-Drafts directori=
es.<br>&gt=3B  This draft is a work item of the RADIUS EXTensions Working G=
roup of the IETF.<br>&gt=3B <br>&gt=3B 	Title           : RADIUS Attributes=
 for IEEE 802 Networks<br>&gt=3B 	Author(s)       : Bernard Aboba<br>&gt=3B=
                           Jouni Malinen<br>&gt=3B                         =
  Paul Congdon<br>&gt=3B                           Joseph Salowey<br>&gt=3B=
                           Mark Jones<br>&gt=3B 	Filename        : draft-ie=
tf-radext-ieee802ext-07.txt<br>&gt=3B 	Pages           : 30<br>&gt=3B 	Date=
            : 2013-06-09<br>&gt=3B <br>&gt=3B Abstract:<br>&gt=3B    RFC 35=
80 provides guidelines for the use of the Remote Authentication<br>&gt=3B  =
  Dialin User Service (RADIUS) within IEEE 802 local area networks<br>&gt=
=3B    (LANs).  This document proposes additional attributes for use within=
<br>&gt=3B    IEEE 802 networks=2C as well as clarifications on the usage o=
f the EAP-<br>&gt=3B    Key-Name attribute=2C updating RFC 4072.  The attri=
butes defined in<br>&gt=3B    this document are usable both within RADIUS a=
nd Diameter.<br>&gt=3B <br>&gt=3B <br>&gt=3B The IETF datatracker status pa=
ge for this draft is:<br>&gt=3B https://datatracker.ietf.org/doc/draft-ietf=
-radext-ieee802ext<br>&gt=3B <br>&gt=3B There's also a htmlized version ava=
ilable at:<br>&gt=3B http://tools.ietf.org/html/draft-ietf-radext-ieee802ex=
t-07<br>&gt=3B <br>&gt=3B A diff from the previous version is available at:=
<br>&gt=3B http://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-radext-ieee802ext-=
07<br>&gt=3B <br>&gt=3B <br>&gt=3B Internet-Drafts are also available by an=
onymous FTP at:<br>&gt=3B ftp://ftp.ietf.org/internet-drafts/<br>&gt=3B <br=
>&gt=3B _______________________________________________<br>&gt=3B radext ma=
iling list<br>&gt=3B radext@ietf.org<br>&gt=3B https://www.ietf.org/mailman=
/listinfo/radext<br></div></div> 		 	   		  </div></body>
</html>=

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From: "Joseph Salowey (jsalowey)" <jsalowey@cisco.com>
To: "lionel.morand@orange.com" <lionel.morand@orange.com>
Thread-Topic: [radext]  #153: Section 2.8 Access-Info
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Subject: Re: [radext] #153: Section 2.8 Access-Info
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Access Status is advertised to the supplicant in EAPOL-Announcement Message=
s which are separate from authentication messages.    I would it expect to =
be communicated in any message from the AAA server as it is possible you ha=
ve some level of access before authentication completes.   Access-Info need=
s to be included in an Access-Challenge message. =20

THanks,

Joe
On Jun 5, 2013, at 12:53 AM, lionel.morand@orange.com wrote:

> I'm not sure to understand this point.
>=20
> As per section 10.1 in 802.1X, the access status indication is consecutiv=
e to an authentication procedure in any case.=20
> So my assumption is that this status is valid for the duration of the ses=
sion. If any change is required, you need to restart a session.
> Except if I have missed something...
>=20
> Regards,
>=20
> Lionel
>=20
>=20
> -----Message d'origine-----
> De : radext-bounces@ietf.org [mailto:radext-bounces@ietf.org] De la part =
de radext issue tracker
> Envoy=E9 : dimanche 5 mai 2013 00:52
> =C0 : draft-ietf-radext-ieee802ext@tools.ietf.org; bernard_aboba@hotmail.=
com
> Cc : radext@ietf.org
> Objet : [radext] #153: Section 2.8 Access-Info
>=20
> #153: Section 2.8 Access-Info
>=20
> The Access-Info Attribute is utilized by implementations of
>       IEEE-802.1X [IEEE-802.1X] to specify the Access status information
>       field within an Access Information Type Length Value Tuple (TLV)
>       to be sent to the user within MACsec Key Agreement (MKA) or EAPoL-
>       Announcement frames.
>=20
>       A single Access-Info Attribute is permitted within a RADIUS
>       Access-Accept, Access-Challenge, Access-Reject or Accounting-
>       Request packet.
>=20
> [BA] The above paragraph seems to imply that the Access-Info Attribute
> could cause the Access status information to change during and after
> authentication.  It is unclear how supplicants would respond to such a
> change.  For example, the potential response to a change in MKA (which is
> authenticated) could be quite different from a change in an EAPoL-
> Announcement frame (which is not).  As a result, the desired behavior is
> unclear.
>=20
> --=20
> -------------------------------------+-----------------------------------=
--
> Reporter:                           |      Owner:  draft-ietf-radext-
>  bernard_aboba@hotmail.com          |  ieee802ext@tools.ietf.org
>     Type:  defect                   |     Status:  new
> Priority:  critical                 |  Milestone:  milestone1
> Component:  ieee802ext               |    Version:  1.0
> Severity:  In WG Last Call          |   Keywords:
> -------------------------------------+-----------------------------------=
--
>=20
> Ticket URL: <http://wiki.tools.ietf.org/wg/radext/trac/ticket/153>
> radext <http://tools.ietf.org/radext/>
>=20
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>=20


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#153: Section 2.8 Access-Info

Changes (by jsalowey@cisco.com):

 * status:  closed => reopened
 * resolution:  fixed =>


-- 
-------------------------------------+-------------------------------------
 Reporter:                           |       Owner:  draft-ietf-radext-
  bernard_aboba@hotmail.com          |  ieee802ext@tools.ietf.org
     Type:  defect                   |      Status:  reopened
 Priority:  critical                 |   Milestone:  milestone1
Component:  ieee802ext               |     Version:  1.0
 Severity:  In WG Last Call          |  Resolution:
 Keywords:                           |
-------------------------------------+-------------------------------------

Ticket URL: <http://trac.tools.ietf.org/wg/radext/trac/ticket/153#comment:3>
radext <http://tools.ietf.org/radext/>


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#153: Section 2.8 Access-Info


Comment (by jsalowey@cisco.com):

 Access Status is advertised to the supplicant in EAPOL-Announcement
 Messages which are separate from authentication messages.    I would it
 expect to be communicated in any message from the AAA server as it is
 possible you have some level of access before authentication completes.
 Access-Info needs to be included in an Access-Challenge message.

-- 
-------------------------------------+-------------------------------------
 Reporter:                           |       Owner:  draft-ietf-radext-
  bernard_aboba@hotmail.com          |  ieee802ext@tools.ietf.org
     Type:  defect                   |      Status:  reopened
 Priority:  critical                 |   Milestone:  milestone1
Component:  ieee802ext               |     Version:  1.0
 Severity:  In WG Last Call          |  Resolution:
 Keywords:                           |
-------------------------------------+-------------------------------------

Ticket URL: <http://trac.tools.ietf.org/wg/radext/trac/ticket/153#comment:4>
radext <http://tools.ietf.org/radext/>


From hartmans@painless-security.com  Mon Jun 10 07:00:33 2013
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From: Sam Hartman <hartmans@painless-security.com>
To: Bernard Aboba <bernard_aboba@hotmail.com>
References: <BLU169-W136C0681F857DF43804AC17939B0@phx.gbl> <51B3E6FB.5040606@deployingradius.com> <BLU169-W56D7E99BC62DD745D09C87939B0@phx.gbl>
Date: Mon, 10 Jun 2013 10:00:14 -0400
In-Reply-To: <BLU169-W56D7E99BC62DD745D09C87939B0@phx.gbl> (Bernard Aboba's message of "Sat, 8 Jun 2013 19:54:43 -0700")
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Subject: Re: [radext] Review of draft-ietf-radext-nai-03
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For what it's worth, I continue to believe that Bernard may have a point
and that we need to engage with the apps community to resolve the
question of normalization.

I'm not particularly worried about the HTTP/SIP/etc points Bernard
raises.  I think that there is some semantic ambiguity there, and I'm
not against improvements in the text, but I don't see that as a blocking
concern.  I think that the ambiguity is unlikely to result in problems
in practice that do not already exist.

--Sam

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From: Bernard Aboba <bernard_aboba@hotmail.com>
To: "Joseph Salowey (jsalowey)" <jsalowey@cisco.com>, "lionel.morand@orange.com" <lionel.morand@orange.com>
Date: Mon, 10 Jun 2013 10:48:55 -0700
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Subject: Re: [radext] #153: Section 2.8 Access-Info
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Joe said:=20
 =20
"Access Status is advertised to the supplicant in EAPOL-Announcement Messag=
es which are separate from authentication messages.    I would it expect to=
 be communicated in any message from the AAA server as it is possible you h=
ave some level of access before authentication completes.   Access-Info nee=
ds to be included in an Access-Challenge message.  "
=20
[BA]  As I understand it=2C the use of the Access-Info attribute is to allo=
w for the setting (and reporting) of the Access Status=2C which might be pr=
ovided in response to a request (or not)=3B protected by MKA (or not)=3B co=
uld relate to a particular NID or for the port in general.   This raises th=
e question of what the usage scenarios are=2C and whether the document cove=
rs them.=20
=20
For example:=20
=20
a. Is there a scenario where the Access-Info attribute could be used along =
with Service-Type=3D"Call Check"?  For example=2C if a request comes in=2C =
could the RADIUS client generate a Call-Check message (e.g. with the MAC ad=
dress of the supplicant in the Calling-Station-Id parameter) and then use t=
he information in the Access-Info Attribute within the EAPoL-Announcement s=
ent in reply?=20
=20
b.  Is the Access-Info Attribute always used to communicate status for the =
port in general=2C or can it sometimes be used to indicate the status for a=
 particular NID?  If the latter=2C how is the NID to which Access-Info rela=
tes communicated?  Does the inclusion of an Network-Id-Name Attribute in th=
e Access-Accept indicate that the Access-Info Attribute is NID-specific?=20
=20
IEEE 802.1X-2010 Section 11.12.2 states:
=20
The Access Information TLV provides the information specified in clause 10.=
1 (see Table 11-9) for a particular NID or for the port in general (if the =
TLV is encoded before any set TLV). =20
=20

=20
 		 	   		  =

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<body class=3D'hmmessage'><div dir=3D'ltr'>Joe said:&nbsp=3B<br>&nbsp=3B&nb=
sp=3B<br>"Access Status is advertised to the supplicant in EAPOL-Announceme=
nt Messages which are separate from authentication messages.    I would it =
expect to be communicated in any message from the AAA server as it is possi=
ble you have some level of access before authentication completes.   Access=
-Info needs to be included in an Access-Challenge message.  "<BR>&nbsp=3B<B=
R>[BA]&nbsp=3B As I understand it=2C the use of the Access-Info attribute i=
s to allow for the setting (and reporting)&nbsp=3Bof the Access Status=2C w=
hich might be provided in response to a request (or not)=3B protected by MK=
A (or not)=3B could relate to a particular NID or for the port in general.&=
nbsp=3B&nbsp=3B This raises the question of what the usage scenarios are=2C=
 and whether the document covers them. <BR>&nbsp=3B<BR>For example: <BR>&nb=
sp=3B<BR>a. Is there a scenario where the Access-Info attribute could be us=
ed along with Service-Type=3D"Call Check"?&nbsp=3B For example=2C if a requ=
est comes in=2C could the RADIUS client generate a Call-Check message (e.g.=
 with the MAC address of the supplicant in the Calling-Station-Id parameter=
) and then use the information in the Access-Info&nbsp=3BAttribute within t=
he EAPoL-Announcement sent in reply?&nbsp=3B<BR>&nbsp=3B<BR>b.&nbsp=3B Is t=
he Access-Info Attribute always used to communicate status for the port in =
general=2C or can it sometimes be used to indicate the&nbsp=3Bstatus for a =
particular NID?&nbsp=3B If the latter=2C how is the NID to which Access-Inf=
o relates communicated?&nbsp=3B Does the inclusion of an Network-Id-Name At=
tribute in the Access-Accept&nbsp=3Bindicate that the Access-Info Attribute=
&nbsp=3Bis NID-specific? <BR>&nbsp=3B<BR>IEEE 802.1X-2010 Section 11.12.2 s=
tates:<BR>&nbsp=3B<BR><font face=3D"TimesNewRoman" size=3D"2"><font face=3D=
"TimesNewRoman" size=3D"2"><p align=3D"LEFT">The Access Information TLV pro=
vides the information specified in clause 10.1 (see Table 11-9) for a parti=
cular NID or for the port in general (if the TLV is encoded before any set =
TLV).</p><p align=3D"LEFT">&nbsp=3B</p><font size=3D"1"></font>&nbsp=3B<BR>=
</font></font>&nbsp=3B<BR><br>&nbsp=3B<BR> 		 	   		  </div></body>
</html>=

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From: "Joseph Salowey (jsalowey)" <jsalowey@cisco.com>
To: Bernard Aboba <bernard_aboba@hotmail.com>
Thread-Topic: [radext]  #153: Section 2.8 Access-Info
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Subject: Re: [radext] #153: Section 2.8 Access-Info
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On Jun 10, 2013, at 10:48 AM, Bernard Aboba <bernard_aboba@hotmail.com<mail=
to:bernard_aboba@hotmail.com>> wrote:

Joe said:

"Access Status is advertised to the supplicant in EAPOL-Announcement Messag=
es which are separate from authentication messages. I would it expect to be=
 communicated in any message from the AAA server as it is possible you have=
 some level of access before authentication completes. Access-Info needs to=
 be included in an Access-Challenge message. "

[BA]  As I understand it, the use of the Access-Info attribute is to allow =
for the setting (and reporting) of the Access Status, which might be provid=
ed in response to a request (or not); protected by MKA (or not); could rela=
te to a particular NID or for the port in general.   This raises the questi=
on of what the usage scenarios are, and whether the document covers them.

For example:

a. Is there a scenario where the Access-Info attribute could be used along =
with Service-Type=3D"Call Check"?  For example, if a request comes in, coul=
d the RADIUS client generate a Call-Check message (e.g. with the MAC addres=
s of the supplicant in the Calling-Station-Id parameter) and then use the i=
nformation in the Access-Info Attribute within the EAPoL-Announcement sent =
in reply?


[Joe] Yes, some systems provide limited access for specific MAC addresses.

b.  Is the Access-Info Attribute always used to communicate status for the =
port in general, or can it sometimes be used to indicate the status for a p=
articular NID?  If the latter, how is the NID to which Access-Info relates =
communicated?  Does the inclusion of an Network-Id-Name Attribute in the Ac=
cess-Accept indicate that the Access-Info Attribute is NID-specific?


[Joe] Good point.  I agree the behavior should be that if the Access-info a=
ttribute is included without a Network-ID-Name then it should pertain to th=
e port in general.  If the access info attribute is included along with a n=
etwork-ID-Name attribute then it pertains to the identified NID.


IEEE 802.1X-2010 Section 11.12.2 states:

The Access Information TLV provides the information specified in clause 10.=
1 (see Table 11-9) for a particular NID or for the port in general (if the =
TLV is encoded before any set TLV).



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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin=
e-break: after-white-space; ">
<br>
<div>
<div>On Jun 10, 2013, at 10:48 AM, Bernard Aboba &lt;<a href=3D"mailto:bern=
ard_aboba@hotmail.com">bernard_aboba@hotmail.com</a>&gt; wrote:</div>
<br class=3D"Apple-interchange-newline">
<blockquote type=3D"cite">
<div class=3D"hmmessage" style=3D"font-size: 12pt; font-family: Calibri; fo=
nt-style: normal; font-variant: normal; font-weight: normal; letter-spacing=
: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-i=
ndent: 0px; text-transform: none; white-space: normal; widows: 2; word-spac=
ing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "=
>
<div dir=3D"ltr">Joe said:&nbsp;<br>
&nbsp;&nbsp;<br>
&quot;Access Status is advertised to the supplicant in EAPOL-Announcement M=
essages which are separate from authentication messages. I would it expect =
to be communicated in any message from the AAA server as it is possible you=
 have some level of access before authentication
 completes. Access-Info needs to be included in an Access-Challenge message=
. &quot;<br>
&nbsp;<br>
[BA]&nbsp; As I understand it, the use of the Access-Info attribute is to a=
llow for the setting (and reporting)&nbsp;of the Access Status, which might=
 be provided in response to a request (or not); protected by MKA (or not); =
could relate to a particular NID or for the
 port in general.&nbsp;&nbsp; This raises the question of what the usage sc=
enarios are, and whether the document covers them.<span class=3D"Apple-conv=
erted-space">&nbsp;</span><br>
&nbsp;<br>
For example:<span class=3D"Apple-converted-space">&nbsp;</span><br>
&nbsp;<br>
a. Is there a scenario where the Access-Info attribute could be used along =
with Service-Type=3D&quot;Call Check&quot;?&nbsp; For example, if a request=
 comes in, could the RADIUS client generate a Call-Check message (e.g. with=
 the MAC address of the supplicant in the Calling-Station-Id
 parameter) and then use the information in the Access-Info&nbsp;Attribute =
within the EAPoL-Announcement sent in reply?&nbsp;<br>
&nbsp;<br>
</div>
</div>
</blockquote>
<div><br>
</div>
<div>[Joe] Yes, some systems provide limited access for specific MAC addres=
ses. &nbsp;&nbsp;</div>
<br>
<blockquote type=3D"cite">
<div class=3D"hmmessage" style=3D"font-size: 12pt; font-family: Calibri; fo=
nt-style: normal; font-variant: normal; font-weight: normal; letter-spacing=
: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-i=
ndent: 0px; text-transform: none; white-space: normal; widows: 2; word-spac=
ing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "=
>
<div dir=3D"ltr">b.&nbsp; Is the Access-Info Attribute always used to commu=
nicate status for the port in general, or can it sometimes be used to indic=
ate the&nbsp;status for a particular NID?&nbsp; If the latter, how is the N=
ID to which Access-Info relates communicated?&nbsp; Does
 the inclusion of an Network-Id-Name Attribute in the Access-Accept&nbsp;in=
dicate that the Access-Info Attribute&nbsp;is NID-specific?<span class=3D"A=
pple-converted-space">&nbsp;</span><br>
&nbsp;<br>
</div>
</div>
</blockquote>
<div><br>
</div>
<div>[Joe] Good point. &nbsp;I agree the behavior should be that if the Acc=
ess-info attribute is included without a Network-ID-Name then it should per=
tain to the port in general. &nbsp;If the access info attribute is included=
 along with a network-ID-Name attribute then
 it pertains to the identified NID.</div>
<div><br>
</div>
<br>
<blockquote type=3D"cite">
<div class=3D"hmmessage" style=3D"font-size: 12pt; font-family: Calibri; fo=
nt-style: normal; font-variant: normal; font-weight: normal; letter-spacing=
: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-i=
ndent: 0px; text-transform: none; white-space: normal; widows: 2; word-spac=
ing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "=
>
<div dir=3D"ltr">IEEE 802.1X-2010 Section 11.12.2 states:<br>
&nbsp;<br>
<font face=3D"TimesNewRoman" size=3D"2">
<div style=3D"margin: 0px; padding: 0px; ">The Access Information TLV provi=
des the information specified in clause 10.1 (see Table 11-9) for a particu=
lar NID or for the port in general (if the TLV is encoded before any set TL=
V).</div>
&nbsp;</font>&nbsp;&nbsp;</div>
</div>
</blockquote>
</div>
<br>
</body>
</html>

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Subject: Re: [radext] Call for agenda items for IETF#87 Berlin meeting
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Just a reminder.

- Jouni & Mauricio

On May 26, 2013, at 6:38 PM, Jouni <jouni.nospam@gmail.com> wrote:

> Folks,
> 
> We have requested for one and half hour meeting slot. If you feel
> like presenting your work (be that in the current charter or not),
> send a request to the co-chairs. Obviously, chartered items will
> be prioritized over other topics.
> 
> - Jouni & Mauricio
> 


From jouni.nospam@gmail.com  Tue Jun 18 02:25:24 2013
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References: <516EA97E.2000005@deployingradius.com> <C47910C2-BCEA-4DC2-A016-C98D67B62DD9@gmail.com> <A95B4818FD85874D8F16607F1AC7C628B4032E@xmb-rcd-x09.cisco.com> <0E1BBA4B-1985-43C3-800A-AF336CABEF30@gmail.com> <517FBD04.1050009@deployingradius.com> <B43B810F-DBF3-4CCD-BFA0-494E10819D2A@gmail.com> <51828E77.9020303@deployingradius.com> <061B9149-3354-4E53-8721-FCD86BF03EF0@gmail.com> <A95B4818FD85874D8F16607F1AC7C628BC542F@xmb-rcd-x09.cisco.com>
To: "radext@ietf.org" <radext@ietf.org>
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Cc: "Joseph Salowey \(jsalowey\)" <jsalowey@cisco.com>, Alan DeKok <aland@deployingradius.com>
Subject: [radext] A way forward with the DTLS document - a poll for WG consensus
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Folks,

We still have a sticking issue with the DTLS document on protocol
multiplexing raised by Joe, see:
http://www.ietf.org/mail-archive/web/radext/current/msg08459.html

So, in order to progress things and get the (rough) WG consensus
what to include in the document, We ask the WG to pick up their
favourite approach from the two choices below. This poll ends on
Tuesday 25th June EOB (EEST).

1) Forbid the protocol multiplexing i.e.,
   require RADIUS over port 1812.

2) Allow protocol multiplexing i.e.,
   Allow RADIUS or DTLS over port 1812.

In both cases, DTLS would be allowed on the DTLS-only TBD port.
The DTLS document will then be changed accordingly to reflect
the WG consensus.


- Jouni & Mauricio

From bernard_aboba@hotmail.com  Tue Jun 18 06:51:55 2013
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Subject: Re: [radext] A way forward with the DTLS document - a poll for WG	consensus
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Assuming that the RADSEC port is allocated, I would prefer choice #1.

On Jun 18, 2013, at 2:25 AM, "Jouni Korhonen" <jouni.nospam@gmail.com> wrote:

> 
> Folks,
> 
> We still have a sticking issue with the DTLS document on protocol
> multiplexing raised by Joe, see:
> http://www.ietf.org/mail-archive/web/radext/current/msg08459.html
> 
> So, in order to progress things and get the (rough) WG consensus
> what to include in the document, We ask the WG to pick up their
> favourite approach from the two choices below. This poll ends on
> Tuesday 25th June EOB (EEST).
> 
> 1) Forbid the protocol multiplexing i.e.,
>   require RADIUS over port 1812.
> 
> 2) Allow protocol multiplexing i.e.,
>   Allow RADIUS or DTLS over port 1812.
> 
> In both cases, DTLS would be allowed on the DTLS-only TBD port.
> The DTLS document will then be changed accordingly to reflect
> the WG consensus.
> 
> 
> - Jouni & Mauricio
> _______________________________________________
> radext mailing list
> radext@ietf.org
> https://www.ietf.org/mailman/listinfo/radext

From hartmans@painless-security.com  Tue Jun 18 07:21:53 2013
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Subject: Re: [radext] Call for agenda items for IETF#87 Berlin meeting
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I think it's fairly important that we spend enough time on the radius
fragmentation issue that we can move forward and avoid continuing to
block ABFAB documents.

--Sam

From diego@tid.es  Tue Jun 18 09:06:13 2013
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From peterd@iea-software.com  Tue Jun 18 10:33:57 2013
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Date: Tue, 18 Jun 2013 10:33:43 -0700 (Pacific Daylight Time)
From: Peter Deacon <peterd@iea-software.com>
To: Jouni Korhonen <jouni.nospam@gmail.com>
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References: <516EA97E.2000005@deployingradius.com> <C47910C2-BCEA-4DC2-A016-C98D67B62DD9@gmail.com> <A95B4818FD85874D8F16607F1AC7C628B4032E@xmb-rcd-x09.cisco.com> <0E1BBA4B-1985-43C3-800A-AF336CABEF30@gmail.com> <517FBD04.1050009@deployingradius.com> <B43B810F-DBF3-4CCD-BFA0-494E10819D2A@gmail.com> <51828E77.9020303@deployingradius.com> <061B9149-3354-4E53-8721-FCD86BF03EF0@gmail.com> <A95B4818FD85874D8F16607F1AC7C628BC542F@xmb-rcd-x09.cisco.com> <7A3DC30B-CBEF-4B4B-B542-89CAB29682BC@gmail.com>
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Cc: "radext@ietf.org" <radext@ietf.org>, "Joseph Salowey \(jsalowey\)" <jsalowey@cisco.com>, Alan DeKok <aland@deployingradius.com>
Subject: Re: [radext] A way forward with the DTLS document - a poll for WG consensus
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On Tue, 18 Jun 2013, Jouni Korhonen wrote:

> We still have a sticking issue with the DTLS document on protocol
> multiplexing raised by Joe, see:
> http://www.ietf.org/mail-archive/web/radext/current/msg08459.html

> So, in order to progress things and get the (rough) WG consensus what to 
> include in the document, We ask the WG to pick up their favourite 
> approach from the two choices below. This poll ends on

> 1) Forbid the protocol multiplexing i.e.,
>   require RADIUS over port 1812.

My favorite is option #1.

regards,
Peter

From ietf@augustcellars.com  Tue Jun 18 12:21:43 2013
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From: "Jim Schaad" <ietf@augustcellars.com>
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References: <516EA97E.2000005@deployingradius.com>	<C47910C2-BCEA-4DC2-A016-C98D67B62DD9@gmail.com>	<A95B4818FD85874D8F16607F1AC7C628B4032E@xmb-rcd-x09.cisco.com>	<0E1BBA4B-1985-43C3-800A-AF336CABEF30@gmail.com>	<517FBD04.1050009@deployingradius.com>	<B43B810F-DBF3-4CCD-BFA0-494E10819D2A@gmail.com>	<51828E77.9020303@deployingradius.com>	<061B9149-3354-4E53-8721-FCD86BF03EF0@gmail.com>	<A95B4818FD85874D8F16607F1AC7C628BC542F@xmb-rcd-x09.cisco.com> <7A3DC30B-CBEF-4B4B-B542-89CAB29682BC@gmail.com>
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Subject: Re: [radext] A way forward with the DTLS document - a poll for WG	consensus
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Forbid the multiplexing. - Just easier.

> -----Original Message-----
> From: radext-bounces@ietf.org [mailto:radext-bounces@ietf.org] On Behalf
> Of Jouni Korhonen
> Sent: Tuesday, June 18, 2013 2:25 AM
> To: radext@ietf.org
> Cc: Joseph Salowey (jsalowey); Alan DeKok
> Subject: [radext] A way forward with the DTLS document - a poll for WG
> consensus
> Importance: High
> 
> 
> Folks,
> 
> We still have a sticking issue with the DTLS document on protocol
> multiplexing raised by Joe, see:
> http://www.ietf.org/mail-archive/web/radext/current/msg08459.html
> 
> So, in order to progress things and get the (rough) WG consensus what to
> include in the document, We ask the WG to pick up their favourite approach
> from the two choices below. This poll ends on Tuesday 25th June EOB
(EEST).
> 
> 1) Forbid the protocol multiplexing i.e.,
>    require RADIUS over port 1812.
> 
> 2) Allow protocol multiplexing i.e.,
>    Allow RADIUS or DTLS over port 1812.
> 
> In both cases, DTLS would be allowed on the DTLS-only TBD port.
> The DTLS document will then be changed accordingly to reflect the WG
> consensus.
> 
> 
> - Jouni & Mauricio
> _______________________________________________
> radext mailing list
> radext@ietf.org
> https://www.ietf.org/mailman/listinfo/radext


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Cc: radext@ietf.org, 'Jouni Korhonen' <jouni.nospam@gmail.com>, "'Joseph Salowey \(jsalowey\)'" <jsalowey@cisco.com>, 'Alan DeKok' <aland@deployingradius.com>
Subject: Re: [radext] A way forward with the DTLS document - a poll for WG consensus
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On 6/18/2013 12:20 PM, Jim Schaad wrote:
> Forbid the multiplexing. - Just easier.
>
>> -----Original Message-----
>> From: radext-bounces@ietf.org [mailto:radext-bounces@ietf.org] On Behalf
>> Of Jouni Korhonen
>> Sent: Tuesday, June 18, 2013 2:25 AM
>> To: radext@ietf.org
>> Cc: Joseph Salowey (jsalowey); Alan DeKok
>> Subject: [radext] A way forward with the DTLS document - a poll for WG
>> consensus
>> Importance: High
>>
>>
>> Folks,
>>
>> We still have a sticking issue with the DTLS document on protocol
>> multiplexing raised by Joe, see:
>> http://www.ietf.org/mail-archive/web/radext/current/msg08459.html
>>
>> So, in order to progress things and get the (rough) WG consensus what to
>> include in the document, We ask the WG to pick up their favourite approach
>> from the two choices below. This poll ends on Tuesday 25th June EOB
> (EEST).
>>
>> 1) Forbid the protocol multiplexing i.e.,
>>     require RADIUS over port 1812.

Agree with 1, forbidding the multiplexing.

Stig

>> 2) Allow protocol multiplexing i.e.,
>>     Allow RADIUS or DTLS over port 1812.
>>
>> In both cases, DTLS would be allowed on the DTLS-only TBD port.
>> The DTLS document will then be changed accordingly to reflect the WG
>> consensus.
>>
>>
>> - Jouni & Mauricio
>> _______________________________________________
>> radext mailing list
>> radext@ietf.org
>> https://www.ietf.org/mailman/listinfo/radext
>
> _______________________________________________
> radext mailing list
> radext@ietf.org
> https://www.ietf.org/mailman/listinfo/radext
>


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Subject: Re: [radext] WGLC #1 for draft-ietf-radext-nai-03
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Folks,

The WGLC#1 has ended. There are now five open tickets in the issue =
tracker
(#162, #145, #146, #164 and #167). I encourage the I-D author(s) and the =
WG
to sort out the remaining tickets as soon as possible.

- Jouni & Mauricio






On Jun 4, 2013, at 7:42 AM, Jouni Korhonen <jouni.nospam@gmail.com> =
wrote:

> Folks,
>=20
> This email starts a two week WGLC for draft-ietf-radext-nai-03. The =
WGLC end
> 18th June 2013 EOB (EEST). We require minimum three reasonable =
reviews. Post
> your comments and concerns to the mailing list and also enter your =
issues you
> want to be _addressed/resolved_ into the issue tracker.
>=20
>=20
> - Jouni & Mauricio


From jouni.nospam@gmail.com  Tue Jun 18 23:32:25 2013
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Subject: Re: [radext] Call for agenda items for IETF#87 Berlin meeting
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Speaking of updates I hope we can see one quickly. The -05 revision left =
the situation into a bit floating state and I hope the new revision =
addresses the issues Bernard and Sam had.

- Jouni


On Jun 18, 2013, at 7:04 PM, Diego R. Lopez <diego@tid.es> wrote:

> Hi Sam,
>=20
> Good you mention it. Alan, yours truly and the other authors are =
preparing a plan for making a new submission in the line of what we =
discussed in Orlando...
>=20
> Be goode,
>=20
> On 18 Jun 2013, at 16:21 , Sam Hartman wrote:
>=20
>> I think it's fairly important that we spend enough time on the radius
>> fragmentation issue that we can move forward and avoid continuing to
>> block ABFAB documents.
>>=20
>> --Sam
>> _______________________________________________
>> radext mailing list
>> radext@ietf.org
>> https://www.ietf.org/mailman/listinfo/radext
>=20
>=20
> --
> "Esta vez no fallaremos, Doctor Infierno"
>=20
> Dr Diego R. Lopez
> Telefonica I+D
> http://people.tid.es/diego.lopez/
>=20
> e-mail: diego@tid.es
> Tel:    +34 913 129 041
> Mobile: +34 682 051 091
> -----------------------------------------
>=20
>=20
> ________________________________
>=20
> Este mensaje se dirige exclusivamente a su destinatario. Puede =
consultar nuestra pol=EDtica de env=EDo y recepci=F3n de correo =
electr=F3nico en el enlace situado m=E1s abajo.
> This message is intended exclusively for its addressee. We only send =
and receive email on the basis of the terms set out at:
> http://www.tid.es/ES/PAGINAS/disclaimer.aspx


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Subject: [radext] Fwd: [Softwires] Adoption of draft-jiang-softwire-map-radius-04 as wg draft
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Folks,

Just let you know that this I-D is in horizon.. and something for us to =
check from the RADIUS protocol correctness point of view.

- Jouni

Begin forwarded message:

> From: Suresh Krishnan <suresh.krishnan@ericsson.com>
> Subject: [Softwires] Adoption of draft-jiang-softwire-map-radius-04 as =
wg draft
> Date: June 18, 2013 10:42:37 PM GMT+03:00
> To: Softwires WG <softwires@ietf.org>
> Cc: Yong Cui <cuiyong@tsinghua.edu.cn>
>=20
> Hi all,
>  The adoption call on the mailing list has demonstrated consensus to
> adopt this draft as a wg draft. Authors, please resubmit this draft as
> draft-ietf-softwire-map-radius-00.
>=20
> Regards
> Suresh & Yong
> _______________________________________________
> Softwires mailing list
> Softwires@ietf.org
> https://www.ietf.org/mailman/listinfo/softwires


From aland@deployingradius.com  Wed Jun 19 07:03:41 2013
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Cc: "radext@ietf.org" <radext@ietf.org>, "radext-chairs@tools.ietf.org" <radext-chairs@tools.ietf.org>
Subject: Re: [radext] WGLC #1 for draft-ietf-radext-nai-03
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Jouni Korhonen wrote:
> The WGLC#1 has ended. There are now five open tickets in the issue tracker
> (#162, #145, #146, #164 and #167). I encourage the I-D author(s) and the WG
> to sort out the remaining tickets as soon as possible.

  I should have an updated draft on Friday.

  Who does normalization is a big issue.  I think it should be done at
the edge, for a number of reasons.  For one, it follows the general
Internet philosophy of having smart edges and a dumb core.

  For another, it's really the only workable approach.  Let's look at an
example.

  Proxy P has been deployed, and is running quite happily for years.

  End user device E wants to get network access.  The user just bought
it, and it's fully of shiny new unicode goodness.  Including code points
which are unknown to proxy P.

  The end point account "belongs" to home server H.  It may, or may not,
have the same unicode information as the endpoint E.  It may, or may
not, have the same unicode information as proxy P.

  It has been suggested that the proxy P do normalization.  Partly
because end points don't do it now, and because there are fewer proxies
than end points.

  However, according to the scenario above (which WILL happen), proxy P
has insufficient information to normalize the realm used by E.  So the
*only* thing that P can do is to treat it as an opaque string.

  However, home server H has supplied P with a "canonical" version of
the realm, as canonicalized by H.  This realm is sadly not the same byte
string as supplied by E.

  Therefore, E can't authenticate.  H has to either supply P with *all*
possible versions of it's realm, or has to give up, and not use i18n at all.

  All this comes about because E is pretty much guaranteed to be newer
than P or H.  It is therefore the *only* entity in the network who is
capable of normalizing the realm.  No one else has the correct information.

  See this page for a recent example of how normalization issues can
cause security holes:
http://labs.spotify.com/2013/06/18/creative-usernames/


  My $0.02 is the following:

- proxies should try to normalize realms, knowing that many endpoints
won't do that.  If the realm can't be normalized, treat it as an opaque
byte string.

- end points MUST normalize realms.  Yes, they don't do this now.  Too
bad.  We've been riding the ASCII wave for 50 years, and it's about to
crash hard on the shoals of i18n.

  I'd like counter-examples showing that end points shouldn't do
normalization.

  Alan DeKok.

From bernard_aboba@hotmail.com  Wed Jun 19 07:28:45 2013
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Subject: Re: [radext] WGLC #1 for draft-ietf-radext-nai-03
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--_2c02c371-6b8c-4106-a957-7de893c7a69a_
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable


>   However=2C according to the scenario above (which WILL happen)=2C proxy=
 P
> has insufficient information to normalize the realm used by E.  So the
> *only* thing that P can do is to treat it as an opaque string.
[BA] Assuming that the realm is encoded in UTF-8 (which I believe the draft=
 can require)=2C I don't see why proxy P would have insufficient informatio=
n.  The "opaque string" comparison doesn't even work for realms which conta=
in no international characters.  For example=2C "exAMPLE.com" and "example.=
com" would not be recognized as equivalent.  		 	   		  =

--_2c02c371-6b8c-4106-a957-7de893c7a69a_
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<html>
<head>
<style><!--
.hmmessage P
{
margin:0px=3B
padding:0px
}
body.hmmessage
{
font-size: 12pt=3B
font-family:Calibri
}
--></style></head>
<body class=3D'hmmessage'><div dir=3D'ltr'><div><br>&gt=3B   However=2C acc=
ording to the scenario above (which WILL happen)=2C proxy P<br>&gt=3B has i=
nsufficient information to normalize the realm used by E.  So the<br>&gt=3B=
 *only* thing that P can do is to treat it as an opaque string.</div><div><=
br></div><div>[BA] Assuming that the realm is encoded in UTF-8 (which I bel=
ieve the draft can require)=2C I don't see why proxy P would have insuffici=
ent information. &nbsp=3B<span style=3D"font-size: 12pt=3B">The "opaque str=
ing" comparison doesn't even work for realms which contain no international=
 characters. &nbsp=3BFor example=2C "exAMPLE.com" and "example.com" would n=
ot be recognized as equivalent.&nbsp=3B</span></div> 		 	   		  </div></bod=
y>
</html>=

--_2c02c371-6b8c-4106-a957-7de893c7a69a_--

From aland@deployingradius.com  Wed Jun 19 08:36:33 2013
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Subject: Re: [radext] WGLC #1 for draft-ietf-radext-nai-03
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Bernard Aboba wrote:
> [BA] Assuming that the realm is encoded in UTF-8 (which I believe the
> draft can require), I don't see why proxy P would have insufficient
> information.

  From the Unicode docs:

http://unicode.org/reports/tr15/#Versioning

...To see what difference the composition version makes, suppose that a
future version of Unicode were to add the composite Q-caron. For an
implementation that uses that future version of Unicode, strings in
Normalization Form C or KC would continue to contain the sequence Q +
caron, and not the new character Q-caron, because a canonical
composition for Q-caron was not defined in the composition version. See
Section 5, Composition Exclusion Table, for more information.
...

  And later:

...
If an implementation normalizes a string that contains characters that
are not assigned in the version of Unicode that it supports, that string
might not be in normalized form according to a future version of
Unicode. For example, suppose that a Unicode 5.0 program normalizes a
string that contains new Unicode 5.1 characters. That string might not
be normalized according to Unicode 5.1.
...

  i.e. End points and proxies will necessarily have different versions
of Unicode.  Endpoints (by definition) know about the Unicode version
that they have installed.  Therefore, they can normalize the realm.

  Proxies will very often have older versions of unicode than endpoints.
 Therefore, by the Unicode docs above, they will be unable to create a
NFC form when the endpoint sends them non-normalized strings.

  Therefore, proxies will receive multiple representations of the "same"
name, and will be unable to determine that they are the same.  The only
action that proxies can take is two treat two different strings as being
different.  Even though updated unicode specs say that they are
normalized to the "same" string.

>  The "opaque string" comparison doesn't even work for
> realms which contain no international characters.  For example,
> "exAMPLE.com" and "example.com" would not be recognized as equivalent. 

  Well, yes.  I ignored ASCII-only names in my example.  I was trying to
focus on i18n names.

  Alan DeKok.

From aland@deployingradius.com  Wed Jun 19 17:54:29 2013
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Subject: Re: [radext] WGLC #1 for draft-ietf-radext-nai-03
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  Bernard and I had a long talk today about the NAI document.  There are
some clear points, but there is still one point which is unclear.

  It's not clear if the process of normalizing a realm name is
independent of Unicode version.  If it is, then proxies can happily
normalize what they get, and we don't care what endpoints produce.

  If it's dependent on Unicode version, then the only system capable of
normalizing the NAI is the endpoint which produces it.  And they don't
normalize NAIs now.

  We're trying to track down a definitive answer.

  Alan DeKok.

From hartmans@painless-security.com  Thu Jun 20 02:54:02 2013
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From: Sam Hartman <hartmans@painless-security.com>
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Subject: Re: [radext] WGLC #1 for draft-ietf-radext-nai-03
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>>>>> "Alan" == Alan DeKok <aland@deployingradius.com> writes:

    Alan>   Bernard and I had a long talk today about the NAI document.
    Alan> There are some clear points, but there is still one point
    Alan> which is unclear.

    Alan>   It's not clear if the process of normalizing a realm name is
    Alan> independent of Unicode version.  If it is, then proxies can
    Alan> happily normalize what they get, and we don't care what
    Alan> endpoints produce.

    Alan>   If it's dependent on Unicode version, then the only system
    Alan> capable of normalizing the NAI is the endpoint which produces
    Alan> it.  And they don't normalize NAIs now.

I think this thinking is bogus.
We're trying to create interoperability.
If we improve the fraction of the time things work, we've made forward
progress even if there are corner cases where it doesn't work.

Endpoints MUST (BUT WE KNOW yOU WON't) normalize because there are some
cases where it's unicode version dependent and a proxy with an older
version has no hope of succeeding.

However, in practice, proxies can do a lot, and so they should.
First, the proxy may not have things stored in Unicode.
Or it may have its routing tables stored in a database that has its own
approach to I18N (say LDAP or some SQL database).
In practice, people will sometimes let that database do the
normalization, and if it increases the chance that you'll route to the
realm then you should encourage that.

It seems bogus to me to assume you need a perfect solution, to assume
normalization can happen in one place or to ignore the long picture as
we migrate things 10-15 years from now.

--Sam

From bernard_aboba@hotmail.com  Thu Jun 20 10:56:45 2013
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Subject: Re: [radext] WGLC #1 for draft-ietf-radext-nai-03
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--_cff00788-ac65-4982-b0f0-8dbee8668861_
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Sam said:=20
> Endpoints MUST (BUT WE KNOW yOU WON't) normalize because there are some
> cases where it's unicode version dependent and a proxy with an older
> version has no hope of succeeding.
>=20
> However=2C in practice=2C proxies can do a lot=2C and so they should.
[BA] That summarizes my perspective.  The challenge is to come up with impl=
ementable guidelines for what proxies should do=2C and demonstrate that the=
y work with running code.  For example=2C assuming that existing EAP implem=
entations will change to support normalization seems silly to me.=20
> It seems bogus to me to assume you need a perfect solution=2C to assume
> normalization can happen in one place or to ignore the long picture as
> we migrate things 10-15 years from now.

[BA] Personally=2C I would be satisfied with a proxy-based solution that wi=
ll work with commonly encountered cases.  For example=2C I wouldn't necessa=
rily declare a potential solution as a "failure" if it couldn't support San=
skrit=2C assuming that it could work with popular character sets.   		 	   =
		  =

--_cff00788-ac65-4982-b0f0-8dbee8668861_
Content-Type: text/html; charset="iso-8859-1"
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<html>
<head>
<style><!--
.hmmessage P
{
margin:0px=3B
padding:0px
}
body.hmmessage
{
font-size: 12pt=3B
font-family:Calibri
}
--></style></head>
<body class=3D'hmmessage'><div dir=3D'ltr'><div>Sam said:&nbsp=3B</div><div=
><br></div><div>&gt=3B Endpoints MUST (BUT WE KNOW yOU WON't) normalize bec=
ause there are some<br>&gt=3B cases where it's unicode version dependent an=
d a proxy with an older<br>&gt=3B version has no hope of succeeding.<br>&gt=
=3B <br>&gt=3B However=2C in practice=2C proxies can do a lot=2C and so the=
y should.</div><div><br></div><div>[BA] That summarizes my perspective. &nb=
sp=3BThe challenge is to come up with implementable guidelines for what pro=
xies should do=2C and demonstrate that they work with running code. &nbsp=
=3BFor example=2C assuming that existing EAP implementations will change to=
 support normalization seems silly to me.&nbsp=3B</div><div><br></div><div>=
&gt=3B It seems bogus to me to assume you need a perfect solution=2C to ass=
ume<br>&gt=3B normalization can happen in one place or to ignore the long p=
icture as<br>&gt=3B we migrate things 10-15 years from now.<br><br></div><d=
iv>[BA] Personally=2C I would be satisfied with a proxy-based solution that=
 will work with commonly encountered cases. &nbsp=3BFor example=2C I wouldn=
't necessarily declare a potential solution as a "failure" if it couldn't s=
upport Sanskrit=2C assuming that it could work with popular character sets.=
 &nbsp=3B</div> 		 	   		  </div></body>
</html>=

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References: <516EA97E.2000005@deployingradius.com> <C47910C2-BCEA-4DC2-A016-C98D67B62DD9@gmail.com> <A95B4818FD85874D8F16607F1AC7C628B4032E@xmb-rcd-x09.cisco.com> <0E1BBA4B-1985-43C3-800A-AF336CABEF30@gmail.com> <517FBD04.1050009@deployingradius.com> <B43B810F-DBF3-4CCD-BFA0-494E10819D2A@gmail.com> <51828E77.9020303@deployingradius.com> <061B9149-3354-4E53-8721-FCD86BF03EF0@gmail.com> <A95B4818FD85874D8F16607F1AC7C628BC542F@xmb-rcd-x09.cisco.com> <7A3DC30B-CBEF-4B4B-B542-89CAB29682BC@gmail.com>
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Subject: Re: [radext] A way forward with the DTLS document - a poll for WG consensus
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Folks,

We can conclude that alternative #1 got most rough consensus to it. 
So this is where the I-D will head to. And we already had consensus
earlier that we will use the existing RADSEC port for DTLS.

- Jouni



On Jun 18, 2013, at 12:25 PM, Jouni Korhonen <jouni.nospam@gmail.com> wrote:

> 
> Folks,
> 
> We still have a sticking issue with the DTLS document on protocol
> multiplexing raised by Joe, see:
> http://www.ietf.org/mail-archive/web/radext/current/msg08459.html
> 
> So, in order to progress things and get the (rough) WG consensus
> what to include in the document, We ask the WG to pick up their
> favourite approach from the two choices below. This poll ends on
> Tuesday 25th June EOB (EEST).
> 
> 1) Forbid the protocol multiplexing i.e.,
>   require RADIUS over port 1812.
> 
> 2) Allow protocol multiplexing i.e.,
>   Allow RADIUS or DTLS over port 1812.
> 
> In both cases, DTLS would be allowed on the DTLS-only TBD port.
> The DTLS document will then be changed accordingly to reflect
> the WG consensus.
> 
> 
> - Jouni & Mauricio


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Subject: Re: [radext] #148: Review of dynamic-discovery by Jim Schaad
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#148: Review of dynamic-discovery by Jim Schaad


Comment (by stefan.winter@restena.lu):

 > 1) In section 2.3.3, step 4 - what is to be considered an error at this
 point.  For example, there are a number of odd conditions that can be
 returned from DNSSEC, specifically the "indeterminate" state.

 I've added text in my working copy which white-lists two sorts of replies
 as good, and everything else as an error. Hope that is adequate and
 removes all ambiguity:

 "2.3.3.  Definitions

    Where the algorithm states "name resolution returns with an error",
    this shall mean that either the DNS request timed out, or every
    response except a) the RR queried for and b) the positive
    acknowledgement that the record queried for does not exist (i.e.
    status: NXDOMAIN)."

 > 2) In section 2.3.4 - Given that the above algorithm does not return a
 TTL value in the event of an empty set or define how to know the TTL value
 - what is the TTL value to be used in in paragraph 2 "negative TTL"?

 I'll have to modify the return value to be a tuple with the second element
 being the place to put a negative TTL into (either as learned from an
 NXDOMAIN reply or configured in case of an absence of any reply). I'll
 keep this TRAC ticket open for this sub-issue.

 > 3) In section 2.3.5 - Does it make sense to return a result, but to
 continue the algorithm and store the result after the timeouts for later
 use?

 We discussed this in the last meeting. It's generally a bad idea (end-
 users can enter bogus DNS data and DoS the server by trying to login with
 corresponding realms). An implementation could be brave and do that
 anyway, so I've added text to Security Considerations explaining the
 issues with it. Implementations can then do a judgment call whether they
 want to take this risk. The text is:

 "   The algorithm has a fixed completion time-out of three seconds.
    Implementations might be tempted to continue their attempt to resolve
    DNS records even after the timeout has passed; a subsequent request
    for the same realm might benefit from retrieving the results anyway.
    Doing so exposes the server to a Denial-of-Service risk: an attacker
    might intentionally craft bogus DNS zones which take a very long time
    to reply (e.g. due to a particularly byzantine tree structure, or
    artificial delays in responses).  If an attacker generates enough
    Access-Requests for a number of such zones, it may deplete server
    sockets or other server resources."

 > 4) I find the security considerations to be completely inadequate for
 this document.
 > Use of a certificate is only going to be valid if the original realm
 name that is the input the validation routine is what is found and matched
 in the certificate.  In this case I would not know where in the name or
 alt name fields of the certificate it would be found.  You cannot validate
 to the final DNS name as that is now an untrusted value.

 We discussed on the list that an MTI validation mechanism which works in
 the absence of DNSSEC is needed (sigh!). I'll work on corresponding text
 soon. I'll keep this TRAC ticket open until the text is ready.

 > The suggestion of out-of-band validation methods ignores the existence
 of DANE.
 >
 > The NAI document suggests that the RADIUS peer is pre-configured with
 information about certificates or TLS validation data.  The suggested text
 works in the case that the table says do dynamic lookup and here is the
 TLS configuration data.  But in other cases it is completely unclear how a
 TLS-PSK would be found for a dynamic lookup.

 These were both discussed on the list; DANE is clumsy/not usable in its
 current state; TLS-PSK is not in scope for this document.

 Greetings,

 Stefan Winter

-- 
-------------------------------------+-------------------------------------
 Reporter:                           |       Owner:  draft-ietf-radext-
  stefan.winter@restena.lu           |  dynamic-discovery@tools.ietf.org
     Type:  defect                   |      Status:  new
 Priority:  major                    |   Milestone:  milestone1
Component:  dynamic-discovery        |     Version:  1.0
 Severity:  -                        |  Resolution:
 Keywords:                           |
-------------------------------------+-------------------------------------

Ticket URL: <http://trac.tools.ietf.org/wg/radext/trac/ticket/148#comment:1>
radext <http://tools.ietf.org/radext/>


From stefan.winter@restena.lu  Wed Jun 26 07:19:34 2013
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Hi,

> I strongly favor the first.  I agree that it means that you need to hav=
e
> a field in the cert that contains the realm's name.
> There are fairly obvious ways this can be done in a SAN.
> RFc 4985 is an example of how microsoft does this.
> My concern with the dnssec approach is that while it's easy to specify,=

>=20
> I'm concerned that dnssec APIs are not widely available enough at
> userspace levels outside the resolver that I'd have confidence
> radsecproxy or freeradius or other radsec implementations could actuall=
y
> implement dnssec validation in the radius proxy right now.

My current working copy defines NAIRealm as a new otherName. At least I
hope that's what it does; I mostly copy&pasted from RFC 4985 and
replaced the strings.

I had to pick an integer for the object identifier; but couldn't find
the registry which holds all the assigned values. So I had to guess - I
picked { id-on 9 }. Beat me with a club if I stole someone's ID. Does
the usage of this pobject ID need to be registered with IANA? If so, let
me know and I'll add a note to IANA considerations.

I also copied the 1993 ASN syntax (assuming that we really don't have to
bother the 1988 one?) into an appendix A.

The text now reads:

"2.3.  Definition of the X.509 certificate property
      SubjectAltName:otherName:NAIRealm

   This specification retrieves IP addresses and port numbers from the
   Domain Name System which are subsequently used to authenticate users
   via the RADIUS/TLS protocol.  Since the Domain Name System is not
   necessarily trustworthy (e.g. if DNSSEC is not deployed for the
   queried domain name), it is important to verify that the server which
   was contacted is authorized to service requests for the user which
   triggered the discovery process.

   The input to the algorithm is a NAI realm as specified in the next
   section.  As a consequence, the X.509 certificate of the server which
   is ultimately contacted for user authentication needs to be able to
   express that it is authorized to handle requests for that realm.

   Current subjectAltName fields do not semantically allow to express an
   NAI realm; the field subjectAltName:dNSName is syntactically a good
   match but would inappropriately conflate DNS names and NAI realm
   names.  Thus, this specification defines a new subjectAltName field
   to hold either a single NAI realm name or a wildcard name matching a
   set of NAI realms.

   This section defines the NAIRealm name as a form of otherName from
   the GeneralName structure in SubjectAltName defined in [RFC5280].

      id-on-nai OBJECT IDENTIFIER ::=3D { id-on 9 }

      NAIRealm ::=3D IA5String (SIZE (1..MAX))

   The NAIRealm, if present, MUST contain an NAI realm as defined in
   TODO: the new NAI document.  It may substitute labels on all dot-
   separated parts of the NAI with the character "*" to indicate a
   wildcard match for "all labels in this part".

   Appendix A contains the ASN.1 definition of the above objects."

And that appendix is:

"Appendix A.  Appendix A: ASN.1 Syntax of NAIRealm



      PKIXServiceNameSAN93 {iso(1) identified-organization(3) dod(6)
          internet(1) security(5) mechanisms(5) pkix(7) id-mod(0)
          id-mod-dns-srv-name-93(40) }

      DEFINITIONS EXPLICIT TAGS ::=3D

      BEGIN

      -- EXPORTS ALL --

      IMPORTS

         id-pkix
               FROM PKIX1Explicit88 { iso(1) identified-organization(3)
               dod(6) internet(1) security(5) mechanisms(5) pkix(7)
               id-mod(0) id-pkix1-explicit(18) } ;
                -- from RFC 3280 [N2]


      -- In the GeneralName definition using the 1993 ASN.1 syntax
      -- includes:

      OTHER-NAME ::=3D TYPE-IDENTIFIER

      -- Service Name Object Identifier

      id-on   OBJECT IDENTIFIER ::=3D { id-pkix 8 }

      id-on-nai OBJECT IDENTIFIER ::=3D { id-on 9 }

      -- Service Name

      naiRealm OTHER-NAME ::=3D { NAIRealm IDENTIFIED BY { id-on-nai }}

      NAIRealm ::=3D IA5String (SIZE (1..MAX))

      END"

The text specifying that checking for this name is MTI is not written
yet; please wait for day++.

Stefan

--=20
Stefan WINTER
Ingenieur de Recherche
Fondation RESTENA - R=E9seau T=E9l=E9informatique de l'Education National=
e et
de la Recherche
6, rue Richard Coudenhove-Kalergi
L-1359 Luxembourg

Tel: +352 424409 1
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Why didn't you just use RFC 4985?
You already have a service tag.

From stefan.winter@restena.lu  Thu Jun 27 04:30:50 2013
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Hi,

> Why didn't you just use RFC 4985?
> You already have a service tag.

The algorithm encounters SRV records only in the middle of the
(untrusted) discovery process. If the first-step NAPTR is counterfeit by
an attacker, it can point to its own SRV, for which it may well have a
valid certificate. That makes using SRV entries and corresponding
SRVName entries from RFC4985 unfit for this purpose.

What the algorithm really needs to do is compare the actual input,
before asking any untrustworthy DNS servers, to the end result of the
discovery process. So it needs to compare the NAI it used to trigger
discovery to the server cert - and the server cert needs to have the NAI
realm(s) it is authoritative for encoded within.

Overloading RFC 4985 syntax also doesn't work (let alone it being a bad
idea); it mandates a syntax of _service.name - and the _service
construct is not part of NAI realms.

So unless I'm seriously mistaken in the above, I think we need a new
otherName which matches the NAI realm semantics.

Greetings,

Stefan Winter

--=20
Stefan WINTER
Ingenieur de Recherche
Fondation RESTENA - R=E9seau T=E9l=E9informatique de l'Education National=
e et
de la Recherche
6, rue Richard Coudenhove-Kalergi
L-1359 Luxembourg

Tel: +352 424409 1
Fax: +352 422473


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I'd recommend coordinating with the pkix working group to get OIDs.
I think Russ manages the registry.

From stefan.winter@restena.lu  Fri Jun 28 02:26:08 2013
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Hi,

> I'd recommend coordinating with the pkix working group to get OIDs.
> I think Russ manages the registry.

I triggered that on the pkix mailing list now. Thanks for the pointer!

Stefan


--=20
Stefan WINTER
Ingenieur de Recherche
Fondation RESTENA - R=E9seau T=E9l=E9informatique de l'Education National=
e et
de la Recherche
6, rue Richard Coudenhove-Kalergi
L-1359 Luxembourg

Tel: +352 424409 1
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Hi,

forwarding more comments from an implementer of dynamic discovery which
I had received over the draft- address. Shared with permission.

Stefan


-------- Original Message --------
Subject: 	Mail reguarding draft-ietf-radext-dynamic-discovery
Resent-Date: 	Tue, 18 Jun 2013 18:21:09 +0200 (CEST)
Resent-From: 	draft-alias-bounces@tools.ietf.org
Resent-To: 	mikem@open.com.au, stefan.winter@restena.lu
Date: 	Tue, 18 Jun 2013 16:20:54 +0000
From: 	Brian Julin <BJulin@clarku.edu>
To: 	draft-ietf-radext-dynamic-discovery@tools.ietf.org
<draft-ietf-radext-dynamic-discovery@tools.ietf.org>



Greetings,

After starting an implementation of draft-ietf-radext-dynamic-discovery
for the FreeRADIUS project, the following are my comments on areas that
I found problematic:

Section 2.3.3 leaves a lot up to implementors when deciding what
constitutes "name resolution returns with error" as there are many
flavors of "error" in DNS.  Also, what to do when RRs are found
that match a search's service/protocol tags but which are deemed
invalid for other reasons, such as unknown NAPTR flags or obviously
unusable owner labels, DNSSec policy, or limitations on local resources
exceeded due to an abusively byzantine NAPTR tree.  When, exactly, the
default SRV target is to be used will vary from implementation to
implementation unless this is nailed down in the draft.

The draft might want to explicitly prohibit the fallback A record
lookup specified in rfc2782 (the final else clause in the "Usage
Rules" section.)

RFC 6613 section 2.2. places restrictions on the use (or not) of TLS
and/or TCP on certain RADIUS assigned port numbers.  How to deal with
the conflict that arises when a NAPTR specifies RadSec as a protocol
and then the SRV points to port 1812 rather than 2083, for example,
is not clear and would bear mention in the draft.

Section 2 lacks a fully explicit definition for RFC 3958 section
3.1.2.  Further, section 2.3.4 is open to multiple interpretations,
and RFC 3403 Section 3 leaves certain details to inference:

1) Section 2.3.5. mandates the termination of the discovery
    process after three seconds, with fallback to static configuration.
    If said static configuration is to reject the request, however,
    in many environments the client will automatically retry some
    seconds or minutes later.  It is therefore useful to continue
    the algorithm in the hopes that a positive result may be obtained
    before that time, allowing follow-up requests from the client
    to succeed promptly.  This might be noted as acceptable behavior, as
    long as requests that wait for 3 seconds are always routed through
    the static configuration for as long as no positive result is
    available.

2) It is not clear as to how to proceed if TTLs, either positive or
    negative, expire during the execution of the algorithm due to DNS
    delays; Section 2.3.4 only specifies that they apply when considering=

    the re-use of results for additional user sessions.  RFC3403 Section =
3
    does specify that records that are "relied upon" will cause a restart=

    of the algorithm if their TTL has expired during a "backtrack", but
    says nothing of what to do during the descent.  Also, it is not
    explicitly stated in RFC3403 Section 3 that a negative result which
    has caused a previous skip of a branch of the NAPTR tree is "relied
    upon", so that may be worth explicit mention.

3) The concerns in 2) may also be mitigated substantially if the draft
    were to put normative limits on how small NAPTR and SRV TTL values
    may be in compliant DDNS database entries.  Allowing small TTLs in
    these records leaves open the possibility that "relied upon" RRs will=

    expire before negative results return from DNS servers, the algorithm=

    will backtrack, and if those negative results also have a short TTL o=
r
    are not well cached, this process could repeat itself for as long as
    the discovery algorithm is allowed to run.  The draft would do well t=
o
    permit compliant implementations to apply a reasonable minimum TTL
    value to all NAPTR and SRV records received, something on the order o=
f
    60 seconds, and to advise database creators to keep NAPTR and SRV
    record TTLs even much higher than that.  One source of advice on this=

    matter is an expired draft, draft-ietf-speermint-srv-naptr-use.


Thank you,

Brian S. Julin

P.S. If the authors would like to keep tabs on the progress of the
abovementioned implementation, it is currently residing on github:

https://github.com/skids/freeradius-server/tree/ddds




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From stefan.winter@restena.lu  Fri Jun 28 08:42:22 2013
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Here's my initial reply, with proposed changes to the draft.


-------- Original Message --------
Subject: Re: Mail reguarding draft-ietf-radext-dynamic-discovery
Resent-Date: Wed, 26 Jun 2013 14:56:25 +0200 (CEST)
Resent-From: draft-alias-bounces@tools.ietf.org
Resent-To: mikem@open.com.au, stefan.winter@restena.lu
Date: Wed, 26 Jun 2013 14:56:09 +0200
From: Stefan Winter <stefan.winter@restena.lu>
To: Brian Julin <BJulin@clarku.edu>
CC: draft-ietf-radext-dynamic-discovery@tools.ietf.org
<draft-ietf-radext-dynamic-discovery@tools.ietf.org>

Hi,

thanks a lot for your in-depth look at the draft spec. This is very much
appreciated!

> After starting an implementation of draft-ietf-radext-dynamic-discovery=

> for the FreeRADIUS project, the following are my comments on areas that=

> I found problematic:
>=20
> Section 2.3.3 leaves a lot up to implementors when deciding what
> constitutes "name resolution returns with error" as there are many
> flavors of "error" in DNS.

2.3.3.  Definitions

   Where the algorithm states "name resolution returns with an error",
   this shall mean that either the DNS request timed out, or every
   response except a) the RR queried for and b) the positive
   acknowledgement that the record queried for does not exist (i.e.
   status: NXDOMAIN).

This would be a whitelist of stuff we want, and everything is else is
declared bad. Would that address your concern?

> Also, what to do when RRs are found
> that match a search's service/protocol tags but which are deemed
> invalid for other reasons, such as unknown NAPTR flags or obviously
> unusable owner labels, DNSSec policy, or limitations on local resources=

> exceeded due to an abusively byzantine NAPTR tree.

I've expanded that step in my working copy now:

   7.   Evaluate NAPTR result(s) for desired protocol tag, perform
        subsequent lookup steps until lookup yields one or more
        hostnames.

   8.   If these name resolutions return an error for any of the
        subsequent lookups (e.g. an SRV target which does not exist), or
        for other reasons does not yield a complete set of hostnames, O
        =3D { empty set } and terminate.

   9.   O' =3D (set of {hostname; port; order/preference; min{all TTLs
        that led to this result} } for all lookup results).  Keep note
        of the remaining TTL of each of the discovered records (e.g. SRV
        and AAAA).

I.e. you either get a final result for all the records, or the discovery
has failed.

Would that address your concern?

>  When, exactly, the
> default SRV target is to be used will vary from implementation to
> implementation unless this is nailed down in the draft.

The underlying philosophy is: if a NAPTR with the expected tags exists,
it is the only option that is being explored. If the content of those
NAPTRs then turns out to contain nonsense, too bad. No fallback in this
case.

The algorithm makes clear that the only reason to consult the SRVs
directly is if there is no NAPTR with fitting tags.

> The draft might want to explicitly prohibit the fallback A record
> lookup specified in rfc2782 (the final else clause in the "Usage
> Rules" section.)

Well, the draft does not refernce RFC2782, neither informatively nor
normatively. Instead, it constructs the SRV discovery inline in the
algorithm. The algorithm does not speak of "A" fallback; so it's not
performed.

> RFC 6613 section 2.2. places restrictions on the use (or not) of TLS
> and/or TCP on certain RADIUS assigned port numbers.  How to deal with
> the conflict that arises when a NAPTR specifies RadSec as a protocol
> and then the SRV points to port 1812 rather than 2083, for example,
> is not clear and would bear mention in the draft.

The ports are merely default ports. If someone runs a RADIUS/TLS server
on 1812 instead of 2083, then that's fine and he can announce that fact
in DNS if he so likes.

If the target he reaches then does NOT speak RADIUS/TLS, then this is an
error in DNS configuration; i.e. a failure condition "like any other".

So, I would think that your next comment is actually the generalised
version of this specific one, as it correctly reprimands me for not
having specified failure/retry mechanisms :-)

> Section 2 lacks a fully explicit definition for RFC 3958 section
> 3.1.2.

That's right; it also misses 3.1.3 (and I've received some beating about
that on the mailing list and during the last IETF meeting :-) ).

For the 3.1.2 issue, how about this text:

2.2.1.2.  Definition of Conditions for Retry/Failure

   RADIUS is a time-critical protocol; RADIUS clients which do not
   receive an answer after a configurable, but short, amount of time,
   will consider the request failed.  Due to this, there is little
   leeway for extensive retries.

   As a general rule, only error conditions which generate an immediate
   response from the other end are eligible for a retry of a discovered
   target.  Any error condition involving time-outs, or the absence of a
   reply for more than one second during the connection setup phase is
   to be considered a failure; the next target in the set of discovered
   NAPTR targets is to be tried.

   As an exception: note that [RFC3958] already defines that a failure
   to identify the server as being authoritative for the realm is always
   considered a failure; so even if a discovered target returns a wrong
   credential instantly, it is not eligible for retry.

(I was shuffling some section numbers in my current working copy, please
ignore the 2.2.1.2 for now)

Regarding 3.1.3, I'll need to think more about it, and need another rev
of the document before it manifests.


>  Further, section 2.3.4 is open to multiple interpretations,
> and RFC 3403 Section 3 leaves certain details to inference:
>=20
> 1) Section 2.3.5. mandates the termination of the discovery
>     process after three seconds, with fallback to static configuration.=

>     If said static configuration is to reject the request, however,
>     in many environments the client will automatically retry some
>     seconds or minutes later.  It is therefore useful to continue
>     the algorithm in the hopes that a positive result may be obtained
>     before that time, allowing follow-up requests from the client
>     to succeed promptly.  This might be noted as acceptable behavior, a=
s
>     long as requests that wait for 3 seconds are always routed through
>     the static configuration for as long as no positive result is
>     available.

This was discussed during the last meeting and on the mailing list. I
have text in my current working copy which instead suggests NOT to try
this (but in Security Considerations and non-normatively, so an
implementation can make a judgement call to try it anyway). It reads:

   The algorithm has a fixed completion time-out of three seconds.
   Implementations might be tempted to continue their attempt to resolve
   DNS records even after the timeout has passed; a subsequent request
   for the same realm might benefit from retrieving the results anyway.
   Doing so exposes the server to a Denial-of-Service risk: an attacker
   might intentionally craft bogus DNS zones which take a very long time
   to reply (e.g. due to a particularly byzantine tree structure, or
   artificial delays in responses.  If an attacker generates enough
   Access-Requests for a number of such zones, it may deplete server
   sockets or other server resources.

> 3) The concerns in 2) may also be mitigated substantially if the draft
>     were to put normative limits on how small NAPTR and SRV TTL values
>     may be in compliant DDNS database entries.  Allowing small TTLs in
>     these records leaves open the possibility that "relied upon" RRs
>     will expire before negative results return from DNS servers, the
>     algorithm will backtrack, and if those negative results also have
>     a short TTL or are not well cached, this process could repeat
>     itself for as long as the discovery algorithm is allowed to run.
>     The draft would do well to permit compliant implementations to
>     apply a reasonable minimum TTL value to all NAPTR and SRV records
>     received, something on the order of 60 seconds, and to advise
>     database creators to keep NAPTR and SRV record TTLs even much
>     higher than that.  One source of advice on this matter is an
>     expired draft, draft-ietf-speermint-srv-naptr-use.

Answering your point 3) first.

I believe there is a misconception on the TTLs here. Of course the
maintainers of a DNS zone should define their entries with reasonably
high TTLs to avoid thrashing. That's a normal consideration for any DNS
label and RR though, I don't think we need to engage in the business of
handholding or explain "DNS domain administration 101".

Also keep in mind that changes in the network infrastructure sometimes
REQUIRE low TTLs, e.g. when trying to change a hostname to A mapping
in-place.

The reason why I wrote misconception though is that these are not the
TTLs the algorithm gets (I tried to construct a pun involving "these are
not the TTLs you are looking for" but didn't manage :-) ). The name
resolution library on the server which does dynamic discovery is very
unlikely to get fresh entries from the respective authoritative DNS
server with the full TTL of that authoritative server. It will much more
likely get a cached reply from its resolver. And resolvers keep track of
how long *they* should cache answers received from upstream. I.e. they
will take the initial TTL from the authoritative server, and will
decrement it on their cached entry. When queried, they will reply with
their own copy's (lower) TTL.

No matter how large the TTL on the authoritative server is, it can at
any time happen that a resolver will reply in the last second of its own
cache lifetime and will rightfully state that the entry is TTLed with a
1 second duration.

So, no amount of advice towards DNS administrators will make your issue
go away.

> 2) It is not clear as to how to proceed if TTLs, either positive or
>     negative, expire during the execution of the algorithm due to DNS
>     delays; Section 2.3.4 only specifies that they apply when consideri=
ng
>     the re-use of results for additional user sessions.  RFC3403 Sectio=
n 3
>     does specify that records that are "relied upon" will cause a resta=
rt
>     of the algorithm if their TTL has expired during a "backtrack", but=

>     says nothing of what to do during the descent.

Picking up your point from 3), it sounds like an interesting idea to
specify that any TTL < 60 seconds (or an arguable other integer) should
be considered as TTL =3D 60 seconds; thereby overriding the DNS caching
rules. Then your concerns would probably be mitigated.

I like that, and would put that in the draft. But I believe it should be
discussed on the mailing list first; I could imagine DNS people to be
disenchanted by an override of their data ("Why do you think you know
better than the DNS admin himself?!?!").

>   Also, it is not
>     explicitly stated in RFC3403 Section 3 that a negative result which=

>     has caused a previous skip of a branch of the NAPTR tree is "relied=

>     upon", so that may be worth explicit mention.

If also all negative results would get at least a 60s survival time,
then this becomes a non-issue, right?

Finally, is it okay for you if I forward your mail and my response to
the IETF radext mailing list? These things are best discussed with as
many eyes on them as possible.

Greeetings,

Stefan Winter

> P.S. If the authors would like to keep tabs on the progress of the
> abovementioned implementation, it is currently residing on github:
>=20
> https://github.com/skids/freeradius-server/tree/ddds

Will take a look!

--=20
Stefan WINTER
Ingenieur de Recherche
Fondation RESTENA - R=E9seau T=E9l=E9informatique de l'Education National=
e et
de la Recherche
6, rue Richard Coudenhove-Kalergi
L-1359 Luxembourg

Tel: +352 424409 1
Fax: +352 422473






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From stefan.winter@restena.lu  Fri Jun 28 08:42:51 2013
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and another follow-up; to which I have yet to write an answer.


-------- Original Message --------
Subject: RE: Mail reguarding draft-ietf-radext-dynamic-discovery
Date: Thu, 27 Jun 2013 01:47:52 +0000
From: Brian Julin <BJulin@clarku.edu>
To: Stefan Winter <stefan.winter@restena.lu>


Stefan,

Thanks again for the followup.  Here are some thoughts.

> > Section 2.3.3 leaves a lot up to implementors when deciding what
> > constitutes "name resolution returns with error" as there are many
> > flavors of "error" in DNS.

> 2.3.3.  Definitions

>    Where the algorithm states "name resolution returns with an error",
>    this shall mean that either the DNS request timed out, or every
>    response except a) the RR queried for and b) the positive
>    acknowledgement that the record queried for does not exist (i.e.
>    status: NXDOMAIN).

> This would be a whitelist of stuff we want, and everything is else is
> declared bad. Would that address your concern?

One case not covered that I know of: NXDOMAIN is not returned when an own=
er
has records of type other than the type you query.  What you get is a
NOERROR response without any of the requested type of RRs, and
usually an authority SOA record, and maybe some additional section RRs.
Try a dig for NAPTRs for ieee.org for example.

I'd suggest defining NXDOMAIN/NSEC/NSEC3 and the above case as a
"negative result" instead, and just say in step 4 to proceed to
step 9 on a credible negative result, step 5 if credible NAPTR RRs
were retrieved, and otherwise O =3D { empty set } and terminate.

(definition of "credible" depends on federation DNSSec policy)

I think this point would benefit from the attention of a jaded^Wexperienc=
ed
DNS developer, which I am not.  There could easily be other modes which I=
've
not seen.

> > Also, what to do when RRs are found
> > that match a search's service/protocol tags but which are deemed
> > invalid for other reasons, such as unknown NAPTR flags or obviously
> > unusable owner labels, DNSSec policy, or limitations on local resourc=
es
> > exceeded due to an abusively byzantine NAPTR tree.

> I've expanded that step in my working copy now:

>    7.   Evaluate NAPTR result(s) for desired protocol tag, perform
>         subsequent lookup steps until lookup yields one or more
>         hostnames.

>    8.   If these name resolutions return an error for any of the
>         subsequent lookups (e.g. an SRV target which does not exist), o=
r
>         for other reasons does not yield a complete set of hostnames, O=

>         =3D { empty set } and terminate.

Minor quibble -- it's presented in steps, but 8 is really happening durin=
g 7
and functioning as a break condition.

>    9.   O' =3D (set of {hostname; port; order/preference; min{all TTLs
>         that led to this result} } for all lookup results).  Keep note
>         of the remaining TTL of each of the discovered records (e.g. SR=
V
>         and AAAA).

> I.e. you either get a final result for all the records, or the discover=
y
> has failed.

> Would that address your concern?

It still needs work.  What's a "complete set of hostnames"?  This is the
area where I'm probably going to try your patience :-).

> >  When, exactly, the
> > default SRV target is to be used will vary from implementation to
> > implementation unless this is nailed down in the draft.

> The underlying philosophy is: if a NAPTR with the expected tags exists,=

> it is the only option that is being explored. If the content of those
> NAPTRs then turns out to contain nonsense, too bad. No fallback in this=

> case.

> The algorithm makes clear that the only reason to consult the SRVs
> directly is if there is no NAPTR with fitting tags.

OK, I'll buy into that part being clear.

> > The draft might want to explicitly prohibit the fallback A record
> > lookup specified in rfc2782 (the final else clause in the "Usage
> > Rules" section.)

> Well, the draft does not refernce RFC2782, neither informatively nor
> normatively. Instead, it constructs the SRV discovery inline in the
> algorithm. The algorithm does not speak of "A" fallback; so it's not
> performed.

The words "perform SRV lookup" could mean to just launch a SRV query,
as intended, or could be taken as "follow the rules for using SRV records=

in the RFC that defines them."  I don't think not mentioning 2782 gets
the draft off the hook here, because once SRV is mentioned as something t=
hat
is a known quantity, the reasonable recourse for an un-annotated external=

reference is to consult relevant RFCs.

As an aside, when dealing with "s" flags, 3958 explicitly states "normal
SRV processing is applied" (2.2.3).  Were it not for the explicit provisi=
on
in 2.2.4. about declaring failure, I would take this to mean that the
Usage Rules in 2782 are supposed to be followed.

It could perhaps be rephrased "look up RRs of type SRV."

> > RFC 6613 section 2.2. places restrictions on the use (or not) of TLS
> > and/or TCP on certain RADIUS assigned port numbers.  How to deal with=

> > the conflict that arises when a NAPTR specifies RadSec as a protocol
> > and then the SRV points to port 1812 rather than 2083, for example,
> > is not clear and would bear mention in the draft.

> The ports are merely default ports. If someone runs a RADIUS/TLS server=

> on 1812 instead of 2083, then that's fine and he can announce that fact=

> in DNS if he so likes.

I'm satisfied with that answer, and it was the one I expected.  Do
note, the language in 6613 for port 1812 in particular is a bit stronger
than merely defining a default port, but that could plausibly be a
shortcoming
in 6613's phrasing.

> If the target he reaches then does NOT speak RADIUS/TLS, then this is a=
n
> error in DNS configuration; i.e. a failure condition "like any other".

> So, I would think that your next comment is actually the generalised
> version of this specific one, as it correctly reprimands me for not
> having specified failure/retry mechanisms :-)

> > Section 2 lacks a fully explicit definition for RFC 3958 section
> > 3.1.2.

> That's right; it also misses 3.1.3 (and I've received some beating abou=
t
> that on the mailing list and during the last IETF meeting :-) ).

> For the 3.1.2 issue, how about this text:

> 2.2.1.2.  Definition of Conditions for Retry/Failure

>    RADIUS is a time-critical protocol; RADIUS clients which do not
>    receive an answer after a configurable, but short, amount of time,
>    will consider the request failed.  Due to this, there is little
>    leeway for extensive retries.

>    As a general rule, only error conditions which generate an immediate=

>    response from the other end are eligible for a retry of a discovered=

>    target.  Any error condition involving time-outs, or the absence of =
a
>    reply for more than one second during the connection setup phase is
>    to be considered a failure; the next target in the set of discovered=

>    NAPTR targets is to be tried.

>    As an exception: note that [RFC3958] already defines that a failure
>    to identify the server as being authoritative for the realm is alway=
s
>    considered a failure; so even if a discovered target returns a wrong=

>    credential instantly, it is not eligible for retry.

> (I was shuffling some section numbers in my current working copy, pleas=
e
> ignore the 2.2.1.2 for now)

> Regarding 3.1.3, I'll need to think more about it, and need another rev=

> of the document before it manifests.

Likewise, it will be some time until I can thoroughly investigate this.
Right now I'm working on the DNS end, and the subsystem that handles
actually
establishing connections is completely separate.  With EAP sessions wanti=
ng
connection affinity and the "State" attribute often not being implemented=

by clients, that subsystem is already pretty beastly and will get more so=

with the pool of eligible servers subject to change, so it is unlikely
integration with DNS processing will be very tight.

There will have to be a crankback mechanism whereby the
connection-pool/load-balancing subsystem demands more/different results
from the DNS subsystem when it decides the identified targets are unusabl=
e.
I suspect this will be the case in most designs -- errors from DNS will b=
e
handled more directly than errors from connection setup.  Just mentioning=
 as
something to keep in mind.

> >  Further, section 2.3.4 is open to multiple interpretations,
> > and RFC 3403 Section 3 leaves certain details to inference:
> >
> > 1) Section 2.3.5. mandates the termination of the discovery
> >     process after three seconds, with fallback to static configuratio=
n.
> >     If said static configuration is to reject the request, however,
> >     in many environments the client will automatically retry some
> >     seconds or minutes later.  It is therefore useful to continue
> >     the algorithm in the hopes that a positive result may be obtained=

> >     before that time, allowing follow-up requests from the client
> >     to succeed promptly.  This might be noted as acceptable behavior,=
 as
> >     long as requests that wait for 3 seconds are always routed throug=
h
> >     the static configuration for as long as no positive result is
> >     available.

> This was discussed during the last meeting and on the mailing list. I
> have text in my current working copy which instead suggests NOT to try
> this (but in Security Considerations and non-normatively, so an
> implementation can make a judgement call to try it anyway). It reads:

>    The algorithm has a fixed completion time-out of three seconds.
>    Implementations might be tempted to continue their attempt to resolv=
e
>    DNS records even after the timeout has passed; a subsequent request
>    for the same realm might benefit from retrieving the results anyway.=

>    Doing so exposes the server to a Denial-of-Service risk: an attacker=

>    might intentionally craft bogus DNS zones which take a very long tim=
e
>    to reply (e.g. due to a particularly byzantine tree structure, or
>    artificial delays in responses.  If an attacker generates enough
>    Access-Requests for a number of such zones, it may deplete server
>    sockets or other server resources.

The point about even a low-depth NAPTR tree from a compromised domain
wreaking flood havoc is well taken, I had not yet considered that.

Some of these vectors will exist whether or not the implementation stops =
at
three seconds.  Also the 3 second value is for the benefit of RADIUS
protocol
fallback needs and should probably not be conflated with a secure value f=
or
abating DoS attacks.  Implementations could use an arbitrary value here
that is
more than 3 seconds but still reasonably finite.  What administrators
will want
instinctively is for the resolution to continue for their usual client
retry interval,
and continue thereafter if refreshed by a retry.

In some vectors three seconds is more than enough time to cause
a lot of hurt, repeated bursts of three seconds moreso.  At the very
least the DNS caches will be subject to loading under these scenarios.
Note that RADIUS servers are likely to be exempt from many of the
safeguards applied to client machines on the DNS server side, and
they are likely to have nice fast 1G or 10G links direct to the DNS
servers with a very low RTT.  A lot of queries can happen under those
conditions in 3 seconds if the terminal records are aimed at NX records
in a locally authoritative domain.

Most mature implementations will likely opt to place arbitrary limits
on the following quantities, per realm, tunable either at compile or
runtime so that resource use can be matched to reasonable expections
within the particular federation(s) involved:

1) total number of backtracks since the last TTL expiry or
well-known-rule instigation
2) number of NAPTR records for which (summarized) TTL information is
tracked.

The width/depth of NAPTR trees will be limited by 2).  The rate of
queries for bogus domains will be limited by 1).

In addition implementations will likely limit the number of ongoing or
cached DDDS discoveries, in a FIFO fashion, failing and/or expunging the
oldest queries when new ones arrive and the cap is exceeded.  As long as
this cap is kept high enough that legitimate queries have time to complet=
e
before they get expunged to make room for a bogus query, RADIUS service
itself is not in jeopardy.  If the rate of these queries is large enough
to spin that FIFO too fast, then the server has bigger problems on its
hands that need to be addressed at a general DoS mitigation level.

I would suggest generalizing that language to simply advise implementatio=
ns
to set sensible limits to prevent over-stacking of pending DDDS discoveri=
es.
If discussions have come up with an advised default value that is
coincidentally
also 3 seconds, distinguish this value from the limit on individual
queries and
present solid rationale as to why 10 to 30 seconds (typical for retries)
is too
long whereas 3 seconds is not.

Note that caching DDDS results for later use is required by the
draft and also a vector for resource DoS, though not for sockets.

> > 3) The concerns in 2) may also be mitigated substantially if the draf=
t
> >     were to put normative limits on how small NAPTR and SRV TTL value=
s
> >     may be in compliant DDNS database entries.  Allowing small TTLs i=
n
> >     these records leaves open the possibility that "relied upon" RRs
> >     will expire before negative results return from DNS servers, the
> >     algorithm will backtrack, and if those negative results also have=

> >     a short TTL or are not well cached, this process could repeat
> >     itself for as long as the discovery algorithm is allowed to run.
> >     The draft would do well to permit compliant implementations to
> >     apply a reasonable minimum TTL value to all NAPTR and SRV records=

> >     received, something on the order of 60 seconds, and to advise
> >     database creators to keep NAPTR and SRV record TTLs even much
> >     higher than that.  One source of advice on this matter is an
> >     expired draft, draft-ietf-speermint-srv-naptr-use.

> Answering your point 3) first.

> I believe there is a misconception on the TTLs here. Of course the
> maintainers of a DNS zone should define their entries with reasonably
> high TTLs to avoid thrashing. That's a normal consideration for any DNS=

> label and RR though, I don't think we need to engage in the business of=

> handholding or explain "DNS domain administration 101".

> Also keep in mind that changes in the network infrastructure sometimes
> REQUIRE low TTLs, e.g. when trying to change a hostname to A mapping
> in-place.

> The reason why I wrote misconception though is that these are not the
> TTLs the algorithm gets (I tried to construct a pun involving "these ar=
e
> not the TTLs you are looking for" but didn't manage :-) ). The name
> resolution library on the server which does dynamic discovery is very
> unlikely to get fresh entries from the respective authoritative DNS
> server with the full TTL of that authoritative server. It will much mor=
e
> likely get a cached reply from its resolver. And resolvers keep track o=
f
> how long *they* should cache answers received from upstream. I.e. they
> will take the initial TTL from the authoritative server, and will
> decrement it on their cached entry. When queried, they will reply with
> their own copy's (lower) TTL.

> No matter how large the TTL on the authoritative server is, it can at
> any time happen that a resolver will reply in the last second of its ow=
n
> cache lifetime and will rightfully state that the entry is TTLed with a=

> 1 second duration.

> So, no amount of advice towards DNS administrators will make your issue=

> go away.

This is understood.  Do note that if a DNS server provides a lingering
record with an extremely low TTL that expires, and the authoritative TTL
is set reasonably, the re-query is only going to happen once in the
short term, as opposed to when the authoritative TTL is e.g. zero.

(Think of what happens when a sports team tour bus or two of 50 or so
eduroamers from the same institution arrives at your school and their
NAPTR TTLs are 1, then they proceed to hop repeatedly around
several autonomous access points without fast-reauth enabled.)

Advice to DNS administrators does not technically solve the issue, though=
,
you are correct.  It just serves (if followed) to reduce the occurence of=

instances where the implementation might need to disobey the TTL -- TTLs
would more often expire in the interstices between RADIUS requests and
be refreshed with values that would endure the full DDDS discovery.

It also sets reasonable expectations on the part of DNS administrators an=
d
federation policy makers as to how DDDS implementations are likely to
behave.
If the guidance suggests a minimum TTL, they'll be duly warned that
implementation behavior might not be reliable if they elect to do otherwi=
se.

Your point about the scope of the specification is well taken, though.

> > 2) It is not clear as to how to proceed if TTLs, either positive or
> >     negative, expire during the execution of the algorithm due to DNS=

> >     delays; Section 2.3.4 only specifies that they apply when conside=
ring
> >     the re-use of results for additional user sessions.  RFC3403 Sect=
ion 3
> >     does specify that records that are "relied upon" will cause a res=
tart
> >     of the algorithm if their TTL has expired during a "backtrack", b=
ut
> >     says nothing of what to do during the descent.

> Picking up your point from 3), it sounds like an interesting idea to
> specify that any TTL < 60 seconds (or an arguable other integer) should=

> be considered as TTL =3D 60 seconds; thereby overriding the DNS caching=

> rules. Then your concerns would probably be mitigated.

Entirely mitigated, yes.  Another option is to say that results are stick=
y
during descent.  From an implementation standpoint the former is easier
since we have to keep the TTL as state anyway.

> I like that, and would put that in the draft. But I believe it should b=
e
> discussed on the mailing list first; I could imagine DNS people to be
> disenchanted by an override of their data ("Why do you think you know
> better than the DNS admin himself?!?!").

> >   Also, it is not
> >     explicitly stated in RFC3403 Section 3 that a negative result whi=
ch
> >     has caused a previous skip of a branch of the NAPTR tree is "reli=
ed
> >     upon", so that may be worth explicit mention.

> If also all negative results would get at least a 60s survival time,
> then this becomes a non-issue, right?

Partially: it solves it for descent, but not for backtrack which can
happen much later.
This is more a technicality than an issue -- the right thing to do
(maintain a summarized
"negative" TTL for each skipped NAPTR RR which is the minimum of all
positive/negative
TTLs involved in the decision to backtrack past the RR in question, and t=
hen
check it when re-using the data) was comprehensible to me, but it isn't
stated outright and might be unfathomable to some implementers.  I probab=
ly
should not have lumped this point into 2) as it does not just apply to
initial descent.  Also it is really RFC3403s problem -- whether patching =
it
up in the application definition is appropriate I leave to the standards
gurus :-)

--
Brian S. Julin



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