[Dime] 99 IETF DIME session notes

"A. Jean Mahoney" <mahoney@nostrum.com> Tue, 18 July 2017 13:41 UTC

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Subject: [Dime] 99 IETF DIME session notes
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Hi all,

Below are my notes from the session yesterday.





1740-1840  July 17, 2017, Monday Afternoon session III
meeting room: Karlin III
Jabber room: dime at jabber.ietf.org (Please join)

Chairs:Jouni Korhonen, Lionel Morand
AD: Ben Campbell

17:40 - 17:45, Preliminaries, Chairs (5 minutes)

slide 1: Title

Lionel Morand: Jouni is not able to make it to the meeting.

slide 2: Note Well

slide 3: Agenda

Note taker/Jabber scribe: Jean Mahoney

Martin Dolly: when will Diameter security discussion happen?

Lionel: end of the session.

17:45 - 17:50, WG Document Status, Chairs (5 minutes)
*draft-ietf-dime-agent-overload-11    --> RFC Ed Queue 	
*draft-ietf-dime-doic-rate-control-06 --> Waiting for Write-Up
*draft-ietf-dime-group-signaling-08   --> In WG Last Call
*draft-ietf-dime-load-09              --> RFC Ed Queue
*draft-ietf-dime-rfc4006bis-03        --> In WG Last Call

slide 4: WG Status Update

Lionel: Both overload and load are in the RFC editor queue due to a 
MISREF. I'll take care of it after this meeting.

Steve Donovan: Just a nit on the slide - I'm the editor on load 
information, I'm not the editor for 4006bis.

Lionel: Group signaling - the author's think it's ready. We need more 
reviews. Marco?

Marco Liebsch: we've updated it before Chicago. We've covered all 
comments. Is ready for expert review.

Lionel: we've received a good technical review from Steve. Needs another 
before WGLC. Rate control is missing its writeup.

Steve: Has it finished WGLC?

Lionel: Yes, needs writeup. Rate-control didn't receive a deep technical 
review. Need further review. From SA5 guys in 3GPP, since they are the 
main users.

slide 5: WG Status update (2/2)

Lionel: AVP level security (e2e) draft has expired - Jouni is not able 
to support the workload alone. I will go to the SAAG meeting and will 
ask for support from security experts. Solution doesn't have to be 
Diameter specific.

Ben Campbell: I would personally like to see this completed. Who will 
deploy it?

Martin Dolly: next round of FCC sys req, they just finished looking at 
SS7 security vulnerabilities, next 2 years they'll look at Diameter. SA3 
coming up in 3 weeks. I'll give them discussion paper, a status update 
of work here. It gets friendly talk there. It's been discussed with 
regard to 5G and security system. It's now or never, 
forever-hold-your-peace time.

Lionel: GSMA would like a recommendation. If it's easy to implement, we 
have ongoing deployment.

Ben: They are welcome to come here and help.

Eric Guttman: for mission-critical deployments, there are 2 security 
domains - operator domain and mission-critical operator domain. We've 
looked at securing at a message or component to a SIP message level. The 
message has to be e2e secure between client and host at the 
mission-critical ISP. Are there AAA requirements where you can't expose 
certain AVPs to the operator? Need to check.

Lionel: From the requirements POV, both should be available with the 
solution. Normally you would only be able to secure signaling between 
gateways for instance. You may have e2e secure exchange between any 
Diameter client and any Diameter server.

Martin: I don't think that's a case. 401 specifies that equipment 
manufacturers must support IPsec for communication within the EPC, but 
says it optional to deploy. No one has deployed. For 5G, the European 
operators are fighting pulling the security into the EPC not at the 
ENodeB. Some of those statements aren't true.

Lionel: Ben, you see there is some interest. We would like to see this 
work done in IETF.

Ben: I observe an interest in using the work. I need to observe interest 
in doing the work. Maybe SAAG will help.

Lionel: It's more a security discussion than a Diameter discussion. Need 
help from security area.

Eric: There was a mechanism for using an SMIME encapsulation. That 
became historic?

Lionel: deprecated. A new mechanism will be defined outside the base 
protocol. All new drafts are based on this.

17:50 - 18:35 Individual draft discussions (45 minutes)

17:50 - 18:10 Diameter Policy Groups and Sets, Lyle (20min)
   Draft: https://tools.ietf.org/html/draft-bertz-dime-predictunits-02
   Draft: https://tools.ietf.org/html/draft-bertz-dime-policygroups-04

slide 1: Title

slide 2: Predicted Units v02 - Motivation

Lyle: It takes 3-4 minutes to spin up a VM.

slide 3: Predicted Units v02 - Update

Lyle: Have not received any new updates. I would like to ask for adoption.

Lionel: Who has read? I wasn't in the last meeting what was the feeling 
in the room?

Ben: Besides the chair and the AD?

Jean: About 7 people total.

Lionel: I've read it and understood the mechanism, which is good. Check 
on the ML if there is support for adoption. There's not much to do on 
this doc.

slide 4: Intermission

slide 5: Purpose

slide 6: Policy Groups - Update

slide 7: Relationship Model

slide 8: Policy Groups Example 1, Overlap Deduplication at Enforcement 
Point - Adding Membership Assignment to Filters

Lyle: SDN switches have limitations of tables (13 tables in OpenFlow). 
Can concatenate tables. The rules no longer overlap. How to use your 
metadata field and tie it back to a customer?

slide 9: Policy Groups Example 2, Application at the Decision Point Process

Lyle: We don't change the user's relationship to their services 
mid-session. Usually reauthorize them before doing that.

slide 10: Applications

slide 11: Next Steps

Lyle: Would like to hear more from the group before asking for adoption.

Lionel: who has read?

Lionel: Go back to the Purpose slide.

Lyle: didn't want to confuse people but wanted a similar aggregation 
concept with backwards compatibility. It's similar to ... It's a 
membership domain.

Lionel: I need to review it again. It would be useful to have more review.

Lyle: I'm not happy with the examples, I'd like them to be consistent 
through the doc.

Lionel: the draft needs to clearly identify why you can't do this with 
existing mechanisms.

Lyle: all of our filters are based on time and what's in the packets. 
When the time is the same and the rule is a default rule, that's the 
most overlap in the system.

Lionel: It's not that clear from the creation of AVP, be good to 
describe it.

18:10 - 18:35 Diameter Specification Recommendations, Lyle (25min)
   Draft: https://tools.ietf.org/html/draft-bertz-dime-diamimpr-00

slide 1: Title

slide 2: Motivation

Lyle: 85% of the time, errors due to ambiguity.

slide 3: Findings

Eric Guttman: send this to SA5 charging if you have a delegate.

Lyle: we don't, but wanted to get it out.

slide 4: Methodology

slide 5: Unexpected Use Cases

slide 6: We are not immune

slide 7: Enumerations

slide 8: Recommendations

slide 9: Defined AVP Recommendations

slide 10: Defined AVPs Recommended Formats

slide 11: Imported AVP Recommendations

slide 12: Grouped AVP / Command Refinement

slide 13: Example Refinement

slide 14: Command Recommendations

slide 15: Enumeration Recommendations

slide 16: GAPs for Automated Validation

slide 17: Example to Close Gaps

slide 18: Enumeration Example Format

slide 19: Open Questions

slide 20: Summary

slide 21:  Next steps

Lionel: who has read? (Three people raised hands)

Lyle: Dave Dolson and Jouni read it.

Lionel: in 3GPP it's not really refinement, because in 3GPP just 
highlight the AVPs they use. We you take a specification and not reading 
anything -

Lyle: they want to just write the code and be done.

Lionel: For new drafts, it should be taken into consideration. For 
existing RFCs, these are documentation errors. When it's clarification, 
it needs to go through the errata process. For the 3GPP specs, CRs need 
to be opened.

Lyle: This has a lot of errors documented. Would this be informational? 
How would it progress?

Lionel: It can be informational, and can be referenced by other docs. No 
guideline here. Just highlight what could go wrong.

Lyle: I would change the style. Make it more of a report.

Lionel: It's not unusual for the IETF to explain issues with 

18:35 - 18:40 Wrap-up and Next, Chairs/AD (5 minutes)

WG Goals/Milestones status - skipped

Next steps/Action Points - Future of the WG

Lionel: We have 3 remaining documents.

Ben: And two that you are thinking of adopting.

Lionel: few people in room, not much activity on the list. I won't be 
able to continue with the chair position - too much work in the 3GPP. 
Same with Jouni - he changed companies, won't be able to continue. What 
is the next step except closing the group?

Ben: The existing documents are post or near WGLC. Those can be in the 
hands of the ADs before long. What's you're time frame for needing to 
step down?

Lionel: I need to know when to stop adopting new documents. Even for Jouni.

Ben: Of the 2 drafts for the adoption - the predictive units can be AD 
sponsored. The group one is on the border, a little more complex. I 
don't have to be the AD that sponsors it.

Lionel: For the group one, I need to see more interest.

Ben: even if I AD sponsor, I want someone to review them.

Lionel: E2E security needs to be done. If we get volunteers from SAAG.

Ben: lets see what happens in SAAG. If there's interest - maybe we can 
spin up some mini-group. Or just speculating here - recharter dime with 
new chairs to just do that.

Lionel: If it is only to go with existing drafts, I think it can be done 
in short timeframe. Need to confirm with Jouni. Defining new charter 
with new chairs may not be useful.

Ben: E2E security may go into the security area.

Lionel: Are there any other comments? (none from the room). To summarize 
- existing WG documents will be pushed forward. For predictive units, 
confirm on ML that it's a WG doc, for the group one, we'll check. After 
those documents, we'll close the WG.

Ben: Those 2 new drafts - predictive definitely and maybe group - can be 
AD sponsored. They can still change to AD sponsorship if we need to 
close the working group sooner. I'm skeptical of bringing new work into 
the group, unless we see interest.

Lionel: Thank you.

ACTION: Chairs to push existing WG documents forward.

ACTION: Lionel to bring the e2e security draft to the SAAG session this 
week to ask for support in finishing it.

ACTION: Confirm interest on mailing list for adopting 

ACTION: Confirm interest on mailing list for adopting 

ACTION: Ben to look more closely at draft-bertz-dime-policygroups as a 
candidate for AD sponsorship.