Re: [icnrg] Review of draft-irtf-icnrg-icntraceroute
Colin Perkins <csp@csperkins.org> Thu, 25 August 2022 21:39 UTC
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From: Colin Perkins <csp@csperkins.org>
To: Spyridon Mastorakis <smastorakis=40unomaha.edu@dmarc.ietf.org>, Christopher Wood <caw@heapingbits.net>
Cc: icnrg@irtf.org
Date: Thu, 25 Aug 2022 22:39:06 +0100
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Subject: Re: [icnrg] Review of draft-irtf-icnrg-icntraceroute
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Hi, Can I check if you have what you need to progress with the updates to this draft, or if you still need input/confirmation from Chris? Colin On 9 Aug 2022, at 16:25, Colin Perkins wrote: > Spyros – thank you! > > Chris – could you please check if the following would address your concerns? > > Thanks, > Colin > > > > > On 1 Jul 2022, at 12:22, Spyridon Mastorakis wrote: > >> Hi Chris, >> >> Thank you very much for your feedback! Please see my response to each of your comments inline. If you agree with my responses, I can go ahead and update the draft. >> >> Please let me know. >> >> Thank you again! >> Spyros >> >>> On Jun 15, 2022, at 9:48 AM, Christopher Wood <caw@heapingbits.net> wrote: >>> >>> Non-NU Email >>> >>> Like the ping document, I found this to be very well structured and written. The use case for the protocol is clear, the protocol itself -- including the forwarder behavior -- is simple, and the security and privacy considerations are thorough. >>> >>> Section 1. >>> >>> To this end, the problem of >>> ascertaining the characteristics (i.e., transit forwarders and >>> delays) of at least one of the available routes to a name prefix is a >>> fundamendal requirement for instumentation and network management. >>> >>> nit: s/instumentation/instrumentation >> >> Thanks for pointing out this typo! >> >>> >>> Section 6. >>> >>> The TrReply Code TLV value of the reply is set to indicate the >>> specific condition that was met. If none of those conditions was >>> met, the TrReply Code is set to 4 to indicate that the hop limit >>> value reached 0. >>> >>> Perhaps I overlooked it, but why does the TrReply Code need to be 4? Is it because there are three prior conditions for the final reply in the session? >> >> This value is based on the protocol specification. We have mentioned it at the end of Section 4.2. >> >>> >>> Section 8. >>> >>> This approach does not protect against on-path attacks, where a >>> compromised forwarder that receives a traceroute reply replaces the >>> forwarder's name and the signature in the message with its own name >>> and signature to make the client believe that the reply was generated >>> by the compromised forwarder. To foil such attack scenarios, a >>> forwarder can sign the reply message itself. In such cases, the >>> forwarder does not have to sign its own name in reply message, since >>> the message signature protects the message as a whole and will be >>> invalidated in the case of an on-path attack. >>> >>> Could a compromised forwarder swap out the name of a traceroute request with the name of its choosing? If so, perhaps this should also be listed in the paragraph above? To be honest, I forget the semantics for how content object response signatures are verified, so this might not be an issue. >>> >> >> My understanding is both in CCNx and NDN, changing the name of a request would invalidate the state in PIT, therefore, a response will not reach the client. To this end, it is unclear to me how much damage swapping out the name of a request could cause in our case. Indeed, unless requests are signed and the signature is verified, a forwarder could swap out the names of requests, but the corresponding response will not reach the client. I suppose a malicious forwarder could still see the response before the response is dropped. I am happy to mention that in Section 8. >> >>> Hope this helps. >>> >>> Best, >>> Chris >>> _______________________________________________ >>> icnrg mailing list >>> icnrg@irtf.org >>> https://urldefense.com/v3/__https://www.irtf.org/mailman/listinfo/icnrg__;!!PvXuogZ4sRB2p-tU!Ck_l3JqxhS1GBV4FC0GZ9yNSHQAmGDDxHwyH_qxYPljEt7_FZEOymbblf1Re5Ilt9oDVo4a6Ux6ZCuQE_ZM$ >> >> _______________________________________________ >> icnrg mailing list >> icnrg@irtf.org >> https://www.irtf.org/mailman/listinfo/icnrg > > _______________________________________________ > icnrg mailing list > icnrg@irtf.org > https://www.irtf.org/mailman/listinfo/icnrg
- [icnrg] Review of draft-irtf-icnrg-icntraceroute Christopher Wood
- Re: [icnrg] Review of draft-irtf-icnrg-icntracero… Dirk Kutscher
- Re: [icnrg] Review of draft-irtf-icnrg-icntracero… Spyridon Mastorakis
- Re: [icnrg] Review of draft-irtf-icnrg-icntracero… Colin Perkins
- Re: [icnrg] Review of draft-irtf-icnrg-icntracero… Colin Perkins
- Re: [icnrg] Review of draft-irtf-icnrg-icntracero… Spyridon Mastorakis
- Re: [icnrg] Review of draft-irtf-icnrg-icntracero… Colin Perkins