Re: [Gen-art] Gen-ART Telechat Review of draft-ietf-radext-radsec-11
"Romascanu, Dan (Dan)" <dromasca@avaya.com> Wed, 29 February 2012 19:35 UTC
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Date: Wed, 29 Feb 2012 20:34:57 +0100
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Thread-Topic: [Gen-art] Gen-ART Telechat Review of draft-ietf-radext-radsec-11
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From: "Romascanu, Dan (Dan)" <dromasca@avaya.com>
To: Pete McCann <mccap@petoni.org>
Cc: gen-art@ietf.org
Subject: Re: [Gen-art] Gen-ART Telechat Review of draft-ietf-radext-radsec-11
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Hi, Please use this address (dromasca@avaya.com) when you respond. Thanks and Reagrds, Dan > -----Original Message----- > From: Dan Romascanu [mailto:dromasca@gmail.com] > Sent: Wednesday, February 29, 2012 9:28 PM > To: Romascanu, Dan (Dan) > Subject: Fwd: [Gen-art] Gen-ART Telechat Review of draft-ietf-radext- > radsec-11 > > ---------- Forwarded message ---------- > From: Russ Housley <housley@vigilsec.com> > Date: Wed, Feb 29, 2012 at 9:04 PM > Subject: Re: [Gen-art] Gen-ART Telechat Review of draft-ietf-radext- > radsec-11 > To: Pete McCann <mccap@petoni.org> > Cc: IETF Gen-ART <gen-art@ietf.org>, Dan Romascanu <dromasca@gmail.com> > > > Pete: > > I did not see a response to this message. Do these changes resolve > your concerns? > > Russ > > > On Jan 31, 2012, at 2:41 AM, Stefan Winter wrote: > > > Hello, > > > > thanks for your review! > > > >> Minor issues: > >> > >> Section 2.4: > >> In TLS-X.509 with PKI infrastructure, a client is uniquely > identified > >> by the serial number of the tuple (presented client > >> certificate;Issuer). > >> SHOULD BE: > >> In TLS-X.509 with PKI infrastructure, a client is uniquely > identified > >> by the tuple (serial number of presented client > certificate;Issuer). > > > > Right, thanks for spotting; fixed now in my working copy. > > > >> Because RADIUS supports the Disconnect Request (server-to-client) > message, > >> it seems that there is some requirement to keep the TLS session open > for the > >> duration of the access that was authorized. Otherwise, the server > would not be > >> able to send such a packet to the client without initiating its own > >> TLS connection > >> which may not be possible or desirable. Is this aspect of the > specification > >> inherited from the referenced TCP specification? It may be helpful > to > >> add a paragraph > >> about this issue. > > > > Dynamic Authoirzation traffic is only very loosely coupled with the > > corresponding authentication traffic. In particular, RFC5176 states > that > > a DynAuth Client (i.e. the one that would initiate the DM message) > may > > or may not be co-located with the RADIUS server which handled the > > authentication. > > There's a recommendation that a DynAuth client should not send its > > traffic directly to the NAS and instead route it via the RADIUS > server. > > If that recommendation is followed, it may make sense to re-use the > same > > TLS session to send the packets indeed. > > But it is certainly not a *requirement* that these types of traffic > are > > "bundled" together, or even just take the same path. > > > > It's true that there may be some operational hassle in setting up a > TLS > > session in the reverse direction if the original TLS session doesn't > > exist any more. RADIUS/TLS shares this fate with all the other > > transports though (in RADIUS/UDP, getting in the reverse direction > > through a firewall, possibly combined with traversing NAT is "fun"; > same > > goes for RADIUS/TCP). So, nothing "new" here IMHO. > > > >> Nits/editorial comments: > >> > >> Section 2.3: > >> x.y.z > >> Did you mean to fill in a real section number here? > > > > Right, for TLS 1.2 that would be RFC6066, section 6. > > > > I have updated the text to state: > > > > + Implementations SHOULD indicate their trusted > Certification > > Authorities. For TLS 1.2, this is done using [RFC5246] > > section 7.4.4 "certificate authorities" (server side) and > > [RFC6066] Section 6 "Trusted CA Indication" (client > side). > > See also Section 3.2. > > > > I'm wondering if I should also include exact pointers to the TLS 1.1 > > equivalents. After all TLS 1.1 is fading out anyway, so I could > imagine > > to leave that as the famous "exercise to the reader" if he wants to > use > > TLS 1.1 still. I wouldn't mind adding them explicitly though; just > let > > me know what you think is preferable. > > > >> Note Section 3.4 (1) ) > >> Missing open paren? > > > > Right. Fixed to: > > > > 4. start exchanging RADIUS datagrams (note Section 3.4 (1) ). The > > shared secret to compute the (obsolete) MD5 integrity checks > and > > attribute encryption MUST be "radsec" (see Section 3.4 (2) ). > > > > Greetings, > > > > Stefan Winter > > > > -- > > Stefan WINTER > > Ingenieur de Recherche > > Fondation RESTENA - Réseau Téléinformatique de l'Education Nationale > et > > de la Recherche > > 6, rue Richard Coudenhove-Kalergi > > L-1359 Luxembourg > > > > Tel: +352 424409 1 > > Fax: +352 422473 > > > > _______________________________________________ > > Gen-art mailing list > > Gen-art@ietf.org > > https://www.ietf.org/mailman/listinfo/gen-art > > > > -- > Dan > http://dan.romascanu.net/
- [Gen-art] Gen-ART Telechat Review of draft-ietf-r… Pete McCann
- Re: [Gen-art] Gen-ART Telechat Review of draft-ie… Stefan Winter
- Re: [Gen-art] Gen-ART Telechat Review of draft-ie… Russ Housley
- Re: [Gen-art] Gen-ART Telechat Review of draft-ie… Romascanu, Dan (Dan)