Re: [Int-area] Re draft-daveor-cgn-logging-02/RFC6302
Dave O'Reilly <rfc@daveor.com> Mon, 09 April 2018 12:42 UTC
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From: Dave O'Reilly <rfc@daveor.com>
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Date: Mon, 09 Apr 2018 13:42:38 +0100
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To: mohamed.boucadair@orange.com
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Subject: Re: [Int-area] Re draft-daveor-cgn-logging-02/RFC6302
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The only problem that I have with this is the use of the word “should” - I hope I’m not splitting hairs here, but I think there is a slight risk of "victim blaming". Consider the scenario where the entity with the Internet-facing server (and therefore with the logs) is a victim of some sort of crime. They have the required logs but they weren’t aware that there was a time offset with reference to a global time source. Again, this is something that happens all the time. Interpreted in this context, I think an indication of what they should have been doing might be a bit on the strong side. What do you think? What about this weaker-worded alternative: “If the entity controlling the server is aware that there is an offset required to synchronise with a global time source, it is expected that the offset would be indicated by the entity while the logs were being collected.” daveor > On 9 Apr 2018, at 07:26, <mohamed.boucadair@orange.com> <mohamed.boucadair@orange.com> wrote: > > Hi Dave, > > What about: > > "The entity which owns the server should indicate the required offset to synchronize with a global time source." > > Cheers, > Med > >> -----Message d'origine----- >> De : Dave O'Reilly [mailto:rfc@daveor.com] >> Envoyé : samedi 7 avril 2018 16:31 >> À : BOUCADAIR Mohamed IMT/OLN >> Cc : int-area@ietf.org >> Objet : Re: [Int-area] Re draft-daveor-cgn-logging-02/RFC6302 >> >> Hi Mohamed, >> >> I dont agree with this bit: >> >>> Adjusting the log records to synchronize with a global time source is the >> responsibility of the entity which owns the server. >> >> I think that both in principle and in practice this >> synchronisation/correction would be carried out by law enforcement as part of >> their investigation. There might, I suppose, be an expectation that a server >> operator would indicate if there was a difference between the times in their >> logs and a standard time reference but in any case the law enforcement >> officer is going to have to go through the logs and calibrate the times in >> the context of whatever matter they are investigating. >> >> The log data plus analysis/calibration would form part of the justification >> for issuing a subpoena for CGN records (depending on jurisdiction), and the >> law enforcement officer would have to be able to stand over the grounds for >> accessing the logs if the request is challenged. If the information being >> requested is heavily dependent on the accuracy of the times stated in the >> request, as might be the case if CGN was in use, one could reasonably expect >> to be asked to justify that the times indicated are accurate (with reference >> to some sort of time standard) - at which point the law enforcement officer, >> forensic analyst, or whoever gathered the evidence would need to be able to >> explain how they concluded that the times in the subpoena were the correct >> ones. This would presumably include any offset calibration that was carried >> out, or at least the results of an investigation to confirm that such a >> calibration was not required. >> >> Also, if a server operator adjusted the times in logs before providing them >> as evidence, it is not beyond the realm of possibility that the >> authenticity/integrity of the evidence could be challenged because the log >> data has been altered since it was recorded. >> >> Regards, >> daveor >> >>> On 6 Apr 2018, at 08:03, <mohamed.boucadair@orange.com> >> <mohamed.boucadair@orange.com> wrote: >>> >>> Hi Dave, >>> >>> Glad to see that we are in agreement. >>> >>> I don't think that those sections are needed for the reasons explained in >> my previous message. >>> >>> One way to avoid misinterpreting your draft as conflicting with existing >> RFCs is to tweak section 7.4, e.g.: >>> >>> OLD: >>> >>> There are many reasons why it is may not be possible to record logs >>> with reference to a centralised time source (e.g. NTP). This could >>> include scenarios should as security sensitive networks, or internal >>> production networks. Times MAY OPTIONALLY be recorded with reference >>> to a centralised time source (e.g. NTP) but this is not necessary. >>> As long as times are recorded consistently, it should be possible to >>> measure the offset from a reference time source if required for the >>> purposes of quering records at another source. This is common >>> practice in digital forensics. >>> >>> NEW: >>> >>> There are many reasons why it may not be possible for servers to record >> logs >>> with reference to a global time source. This could >>> include scenarios such as security sensitive networks, or internal >>> production networks. As long as times are recorded consistently, it >> should be possible to >>> measure the offset from a traceable global time source (if required) for >> the >>> purposes of querying records at another source. Adjusting the log records >> to >>> synchronize with a global time source is the responsibility of the entity >>> which owns the server. >>> >>> Cheers, >>> Med >>> >>>> -----Message d'origine----- >>>> De : Dave O'Reilly [mailto:rfc@daveor.com] >>>> Envoyé : jeudi 5 avril 2018 16:29 >>>> À : BOUCADAIR Mohamed IMT/OLN >>>> Cc : int-area@ietf.org >>>> Objet : Re: [Int-area] Re draft-daveor-cgn-logging-02/RFC6302 >>>> >>>> Hi Mohamed, >>>> >>>> Thanks for your mail. >>>> >>>> I agree with you. >>>> >>>> The only reason I put these sections in here was because the IESG conflict >>>> review indicated a conflict between this document and the other two RFCs >>>> mentioned (Ref: https://datatracker.ietf.org/doc/conflict-review-daveor- >> cgn- >>>> logging/). In an effort to reconcile the feedback received with the >> content >>>> of draft-daveor-cgn-logging, I added these sections. >>>> >>>> Perfectly happy to remove them if that is the way the consensus emerges. >>>> >>>> daveor >>>> >>>> >>>>> On 5 Apr 2018, at 15:24, <mohamed.boucadair@orange.com> >>>> <mohamed.boucadair@orange.com> wrote: >>>>> >>>>> Hi Dave, >>>>> >>>>> I have a comment about the proposed update to RFC 6269 (the same comment >>>> applies for RFC6302, though). >>>>> >>>>> Actually, the proposed NEW text will require an extra effort to align >>>> timestamps among the server which maintains the logs, the authorities that >>>> relay an abuse claim, and the provider who manages the CGN. That extra >> effort >>>> has to be done by the entity managing the log server. >>>>> >>>>> From that standpoint, the proposed NEW text is no more than another >> example >>>> of "Accurate time-keeping"...which IMHO does not justify an update to the >>>> 6269. >>>>> >>>>> Cheers, >>>>> Med >>>>> >>>>>> -----Message d'origine----- >>>>>> De : Int-area [mailto:int-area-bounces@ietf.org] De la part de Dave >>>> O'Reilly >>>>>> Envoyé : mercredi 4 avril 2018 22:26 >>>>>> À : int-area@ietf.org >>>>>> Objet : Re: [Int-area] Re draft-daveor-cgn-logging-02/RFC6302 >>>>>> >>>>>> Dear all, >>>>>> >>>>>> Further to my email below, I have revised draft-daveor-cgn-logging and >>>>>> revision -03 is now available. I have restructured the content into the >>>> form >>>>>> of recommendations. >>>>>> >>>>>> Here’s the link: https://tools.ietf.org/html/draft-daveor-cgn-logging-03 >>>>>> >>>>>> I have also included, at sections 7.6 and 7.7, proposed amendments to >>>> RFC6302 >>>>>> and RFC6269 respectively. >>>>>> >>>>>> Regards, >>>>>> daveor >>>>>> >>>>>>> On 20 Mar 2018, at 13:45, Dave O'Reilly <rfc@daveor.com> wrote: >>>>>>> >>>>>>> Dear all, >>>>>>> >>>>>>> further to presenting at IETF-101 yesterday I wanted to send a follow >> up >>>>>> email to see if there is interest in working on a new best current >>>> practice >>>>>> for logging at internet-facing servers. >>>>>>> >>>>>>> I hope I adequately presented the reasons why I think there needs to be >>>>>> some revision of the recommendations of RFC6302 and that there is some >>>>>> additional points to be considered in draft-daveor-cgn-logging-02. >>>>>>> >>>>>>> The current version of the document (draft-daveor-cgn-logging-02) >>>> contains >>>>>> recommendations, but it is not really in the form of a BCP. If there is >>>>>> interest, I would like to suggest, in the first instance at least, that >> I >>>>>> prepare a new version of the document, structured in the form of a BCP >>>> with a >>>>>> set of recommendations for discussion. >>>>>>> >>>>>>> Any feedback would be appreciated. >>>>>>> >>>>>>> Thanks and best regards, >>>>>>> daveor >>>>>>> >>>>>>> _______________________________________________ >>>>>>> Int-area mailing list >>>>>>> Int-area@ietf.org >>>>>>> https://www.ietf.org/mailman/listinfo/int-area >>>>>> >>>>>> _______________________________________________ >>>>>> Int-area mailing list >>>>>> Int-area@ietf.org >>>>>> https://www.ietf.org/mailman/listinfo/int-area >>> >
- [Int-area] Re draft-daveor-cgn-logging-02/RFC6302 Dave O'Reilly
- Re: [Int-area] Re draft-daveor-cgn-logging-02/RFC… Dave O'Reilly
- Re: [Int-area] Re draft-daveor-cgn-logging-02/RFC… mohamed.boucadair
- Re: [Int-area] Re draft-daveor-cgn-logging-02/RFC… Dave O'Reilly
- Re: [Int-area] Re draft-daveor-cgn-logging-02/RFC… mohamed.boucadair
- Re: [Int-area] Re draft-daveor-cgn-logging-02/RFC… Dave O'Reilly
- Re: [Int-area] Re draft-daveor-cgn-logging-02/RFC… mohamed.boucadair
- Re: [Int-area] Re draft-daveor-cgn-logging-02/RFC… Dave O'Reilly
- Re: [Int-area] Re draft-daveor-cgn-logging-02/RFC… mohamed.boucadair
- Re: [Int-area] Re draft-daveor-cgn-logging-02/RFC… Dave O'Reilly