Re: [tram] [Technical Errata Reported] RFC7635 (5060)
Magnus Westerlund <magnus.westerlund@ericsson.com> Wed, 13 January 2021 16:07 UTC
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From: Magnus Westerlund <magnus.westerlund@ericsson.com>
To: "justin@uberti.name" <justin@uberti.name>
CC: "deadbeef@google.com" <deadbeef@google.com>, "tram@ietf.org" <tram@ietf.org>, "sperreault@jive.com" <sperreault@jive.com>, "tireddy@cisco.com" <tireddy@cisco.com>, "praspati@cisco.com" <praspati@cisco.com>, Gonzalo Camarillo <gonzalo.camarillo@ericsson.com>, "rmohanr@cisco.com" <rmohanr@cisco.com>
Thread-Topic: [tram] [Technical Errata Reported] RFC7635 (5060)
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Date: Wed, 13 Jan 2021 16:06:41 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/tram/2dYWA3ndb60GPx3tSQbfW9uUyJM>
Subject: Re: [tram] [Technical Errata Reported] RFC7635 (5060)
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Hi, Per discussion for Errata 5059 I think there is an interoperability issue here due to the change from an implied truncation to using a longer than 160-bits input that will produce different hashing results. I will also note that Appendix B is further suspect as the referenced format has not yet been published and appears to have made no progress since 2019. Thus, I am leaning towards Hold for document update for this one. Cheers Magnus On Thu, 2020-09-24 at 08:51 -0700, Justin Uberti wrote: > This looks correct to me at first glance. Will re-read in context and give a > definitive answer. > > On Wed, Sep 23, 2020 at 7:22 AM Magnus Westerlund < > magnus.westerlund@ericsson.com> wrote: > > Hi, > > > > I would appreciate some response regarding this Errata. Should it be > > verified, > > held for document update, or rejected? > > > > Cheers > > > > Magnus Westerlund > > > > On Wed, 2017-07-05 at 16:35 -0700, RFC Errata System wrote: > > > The following errata report has been submitted for RFC7635, > > > "Session Traversal Utilities for NAT (STUN) Extension for Third-Party > > > Authorization". > > > > > > -------------------------------------- > > > You may review the report below and at: > > > http://www.rfc-editor.org/errata/eid5060 > > > > > > -------------------------------------- > > > Type: Technical > > > Reported by: Taylor Brandstetter <deadbeef@google.com> > > > > > > Section: Appendix B > > > > > > Original Text > > > ------------- > > > [STUN] supports hash agility and accomplishes this agility by > > > computing message integrity using both HMAC-SHA-1 and > > > HMAC-SHA-256-128. The client signals the algorithm supported by it > > > to the authorization server in the 'alg' parameter defined in > > > [POP-KEY-DIST]. The authorization server determines the length of > > > the mac_key based on the HMAC algorithm conveyed by the client. If > > > the client supports both HMAC-SHA-1 and HMAC-SHA-256-128, then it > > > signals HMAC-SHA-256-128 to the authorization server, gets a 256-bit > > > key from the authorization server, and calculates a 160-bit key for > > > HMAC-SHA-1 using SHA1 and taking the 256-bit key as input. > > > > > > Corrected Text > > > -------------- > > > [STUN] supports hash agility and accomplishes this agility by > > > computing message integrity using both HMAC-SHA-1 and > > > HMAC-SHA-256-128. The client signals the algorithm supported by it > > > to the authorization server in the 'alg' parameter defined in > > > [POP-KEY-DIST]. The authorization server determines the length of > > > the mac_key based on the HMAC algorithm conveyed by the client. If > > > the client supports both HMAC-SHA-1 and HMAC-SHA-256-128, then it > > > signals HMAC-SHA-256-128 to the authorization server, and gets a > > > 256-bit key from the authorization server, which can be used to > > > compute both the HMAC-SHA-1 and HMAC-SHA-256-128 hashes. If the > > > client only supports HMAC-SHA-1, the authorization server could > > > return a 160-bit key, as keys longer than the HMAC-SHA-1 output > > > size of 160-bits would not significantly increase the function's > > > strength. > > > > > > Notes > > > ----- > > > The SHA-1 block size is 512 bits, so a 256-bit key does not need to be > > > shortened to compute a HMAC-SHA-1 hash. > > > > > > Also added an example for "if the client only supports HMAC-SHA-1", to > > make > > > the hash agility logic more clear. > > > > > > Instructions: > > > ------------- > > > This erratum is currently posted as "Reported". If necessary, please > > > use "Reply All" to discuss whether it should be verified or > > > rejected. When a decision is reached, the verifying party > > > can log in to change the status and edit the report, if necessary. > > > > > > -------------------------------------- > > > RFC7635 (draft-ietf-tram-turn-third-party-authz-16) > > > -------------------------------------- > > > Title : Session Traversal Utilities for NAT (STUN) Extension > > for > > > Third-Party Authorization > > > Publication Date : August 2015 > > > Author(s) : T. Reddy, P. Patil, R. Ravindranath, J. Uberti > > > Category : PROPOSED STANDARD > > > Source : TURN Revised and Modernized > > > Area : Transport > > > Stream : IETF > > > Verifying Party : IESG > > > > > > _______________________________________________ > > > tram mailing list > > > tram@ietf.org > > > https://www.ietf.org/mailman/listinfo/tram
- [tram] [Technical Errata Reported] RFC7635 (5060) RFC Errata System
- Re: [tram] [Technical Errata Reported] RFC7635 (5… Magnus Westerlund
- Re: [tram] [Technical Errata Reported] RFC7635 (5… Justin Uberti
- Re: [tram] [Technical Errata Reported] RFC7635 (5… Magnus Westerlund