Re: [P2PSIP] Ben Campbell's No Objection on draft-ietf-p2psip-share-09: (with COMMENT)
"Ben Campbell" <ben@nostrum.com> Fri, 04 November 2016 22:58 UTC
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From: Ben Campbell <ben@nostrum.com>
To: "Thomas C. Schmidt" <t.schmidt@haw-hamburg.de>
Date: Fri, 04 Nov 2016 17:58:06 -0500
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Subject: Re: [P2PSIP] Ben Campbell's No Objection on draft-ietf-p2psip-share-09: (with COMMENT)
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On 4 Nov 2016, at 17:51, Thomas C. Schmidt wrote: > HI Ben, > > On 04.11.2016 23:17, Ben Campbell wrote: > >>>>>> ---------------------------------------------------------------------- >>>>>> COMMENT: >>>>>> ---------------------------------------------------------------------- >>>>>> > >>>>> ... then you identify the user in the ACL and walk up the >>>>> delegation >>>>> chain. >>>>> >>>>> In step 5, you have arrived at the root of the delegation tree. >>>>> This >>>>> is the case, when the to_user equals the signer equals the owner >>>>> of >>>>> the resources (see see Figure 1). This is also how it terminates - >>>>> the >>>>> owner of the resource is the root of the trust chain. >>>> >>>> I'm probably being dense here, but my confusion is in the phrasing >>>> of >>>> "the "to_user" value user name of the signer of the previously >>>> selected >>>> ACL item". Won't that always be true for every ACL item up the >>>> chain >>>> after the first? >>>> >>> >>> No, the selected ACL item from the previous step is the row you are >>> in. It basically says that the "to_user" value equals the username >>> of >>> the signer. This is the "A A" case in row 4 in your example below. >>> This row should be in an ACL only once and the user must be the >>> owner >>> of the resource, which is requested to be verified separately. >>> >>>> As an example, Lets say I have a delegation chain of A,B,C,D, where >>>> A >>>> is >>>> the owner. Would the ACL chain look like the following (in >>>> leave-to-root >>>> order )? >>>> >>>> signer to_user >>>> 1 C D >>>> 2 B C >>>> 3 A B >>>> 4 A A >>>> >>>> If so, then ACL 2 seems to have a to_user that matches the signer >>>> of >>>> ACL >>>> 1 (the previously selected ACL), which seems to terminate early. >>>> >>>> Again, I'm sure I'm missing something. >>>> >>> >>> I believe the confusion comes from the "previously" - this is meant >>> to >>> refer to the "previous step" and the actual row. We changed >>> "previously" to "previous step" to avoid this confusion. >> >> I still think I'm confused. Step 5 basically says iterate over steps >> 3 >> and 4. If I'm currently looking at the ACL from the Nth iteration of >> 3 >> and 4, it seems to me that the "ACL from the previous step" is ACL >> N-1. >> > > The delegation is a tree - so it's not a linear chain. > >> If the terminal condition is when you find an ACL where the signer >> and >> the to_user are the same, then I you could say _that_ without getting >> into "previous steps." >> > > Guess you are right. Why don't we simplify the sentence to > > "Repeat steps 3 and 4 until the "to_user" value is equal to the user > name of the signer of the ACL in the selected item." ? Assuming that gives the right results (I'll leave that to you to decide), I think it would be easier to understand. Thanks! Ben. > > Thanks, > thomas > > -- > > Prof. Dr. Thomas C. Schmidt > ° Hamburg University of Applied Sciences Berliner > Tor 7 ° > ° Dept. Informatik, Internet Technologies Group 20099 Hamburg, > Germany ° > ° http://www.haw-hamburg.de/inet Fon: > +49-40-42875-8452 ° > ° http://www.informatik.haw-hamburg.de/~schmidt Fax: > +49-40-42875-8409 °
- [P2PSIP] Ben Campbell's No Objection on draft-iet… Ben Campbell
- Re: [P2PSIP] Ben Campbell's No Objection on draft… Thomas C. Schmidt
- Re: [P2PSIP] Ben Campbell's No Objection on draft… Ben Campbell
- Re: [P2PSIP] Ben Campbell's No Objection on draft… Thomas C. Schmidt
- Re: [P2PSIP] Ben Campbell's No Objection on draft… Ben Campbell
- Re: [P2PSIP] Ben Campbell's No Objection on draft… Thomas C. Schmidt
- Re: [P2PSIP] Ben Campbell's No Objection on draft… Ben Campbell