Re: [Idr] AD Review of draft-ietf-idr-shutdown-07
"Alvaro Retana (aretana)" <aretana@cisco.com> Mon, 24 April 2017 21:59 UTC
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From: "Alvaro Retana (aretana)" <aretana@cisco.com>
To: Job Snijders <job@instituut.net>
CC: "draft-ietf-idr-shutdown@ietf.org" <draft-ietf-idr-shutdown@ietf.org>, "idr-chairs@ietf.org" <idr-chairs@ietf.org>, Hares Susan <shares@ndzh.com>, "idr@ietf.org" <idr@ietf.org>
Thread-Topic: [Idr] AD Review of draft-ietf-idr-shutdown-07
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Date: Mon, 24 Apr 2017 21:59:47 +0000
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Subject: Re: [Idr] AD Review of draft-ietf-idr-shutdown-07
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On 4/22/17, 6:10 AM, "Job Snijders" <job@instituut.net> wrote: Job: Hi! … > > C5. Section 4. (Error Handling): “Any erroneous or malformed Shutdown > > Communication received SHOULD be logged for the attention of the > > operator and then MAY be discarded.” > > > > C5.1. What does “erroneous or malformed” mean? I guess this is beyond > > a bad length, but maybe it refers to invalid UTF-8 sequences, or maybe > > something different. ?? > > Yes, section 2 "A receiving BGP speaker MUST NOT interpret invalid UTF-8 > sequences." So, what a BGP speaker could do is send a hexdumped version > of the received data to syslog after something like "printf("%02x", > *p++);", rather then present that data through usual ways (as UTF-8). Ok, so “erroneous or malformed” just refers to an “invalid UTF-8 sequence”? If so, then just say that and don’t leave it up to interpretation. … > > C5.3. Section 2 already talks about reporting the contents -- I’m > > assuming the logging requirement here is the same (do whatever you > > want, but syslog SHOULD be used), right? If so, then how is the > > handling of the “erroneous or malformed” information different than > > that of the one that isn’t? > > I envision that in the invalid case one simply logs "received malformed > shutdown communication", with perhaps a hexdump of what was received, > and in the normal situation a bgp speaker decodes the string as UTF-8, > syslogs the result, and perhaps stores it for historic purposes. Do you > have a suggestion how to clarify? > > perhaps, NEW: > > """ > If an erroneous or malformed Shutdown Communication is received, a > message indicating this event SHOULD be logged for the attention of > the operator. An erroneous or malformed Shutdown Communication > itself MAY be logged in a hexdump format. > """ That text seems fine to me. > > C6. Section 5. (IANA Considerations) Why do you want the registry to > > refer to this document? There’s nothing in this document that > > modifies or affects the registry, the policies or the assignments… I > > think that the Updates tag is enough to show the relationship. > > Because 4486 is updated, and 4486 instantiated those entries. I believe > there is benefit in providing this additional way to show the relation. > A developer or debugger might go straight to the registry looking for > just the value mapping, and then be happy to learn that subcode 2 & 4 > could be followed by trailing data which is encoded in a specific way. That still doesn’t seem needed to me, but I’m happy to let IANA raise a flag if it is an issue for them. > > C7. Section 6. (Security Considerations) > > > > C7.1. REQUIRING is not an rfc2119 keyword. Please work REQUIRED in > > there instead. > > OK, I got that from RFC 5424, so we might need an errata there. It looks like we do. … > > C7.3. In the Shepherd’s write-up [2], Sue wrote: “The Security-ADs > > will look at the ability to send data which indicates specific details > > regarding an operator or the operator's topology.” Given that the > > operator can put anything in the string, it would be nice if you > > addressed this concern up front (and not wait for the SEC ADs). Even > > if the information is being sent to a “trusted” peer, I think Sue > > raises an interesting point as “confidential” information may be > > inadvertently sent out. One way to address this concern may be with > > guidance to operators and to reaffirm the fact that while the > > information is sent only one hop away (to your peer), it can be used > > as the receiver’s discretion. > > > > [2] https://datatracker.ietf.org/doc/draft-ietf-idr-shutdown/shepherdwriteup/ > > Interesting point. Do you think XMPP, SMTP, NNTP, and SYSLOG, include > similar clauses? I don’t know, did you look? ;-) All those protocols were standardized before the IAB/IESG acquired a new taste for privacy. Take a look at rfc6973 and at this short review [3]. [3] https://ietf.org/edu/tutorials/89-Privacy-Tschofenig.pdf > I personally may want to wait for a security AD to > actually make and argue the point rather then 'preempt' the angle with > text which borders on legalese. No need to be too clever when writing this up; all you need is a recognition that secondary use of the data can occur, some recommendations about how to mitigate (by not including too much), and maybe a pointer to rfc6973. > Following your feedback, we'll post an update shortly. Thanks! Alvaro.
- [Idr] AD Review of draft-ietf-idr-shutdown-07 Alvaro Retana (aretana)
- Re: [Idr] AD Review of draft-ietf-idr-shutdown-07 Job Snijders
- Re: [Idr] AD Review of draft-ietf-idr-shutdown-07 Alvaro Retana (aretana)
- Re: [Idr] AD Review of draft-ietf-idr-shutdown-07 Jeffrey Haas
- Re: [Idr] AD Review of draft-ietf-idr-shutdown-07 Job Snijders
- Re: [Idr] AD Review of draft-ietf-idr-shutdown-07 Alvaro Retana (aretana)
- Re: [Idr] AD Review of draft-ietf-idr-shutdown-07 Job Snijders