[art] Alissa Cooper's No Objection on draft-ietf-appsawg-mdn-3798bis-15: (with COMMENT)
"Alissa Cooper" <alissa@cooperw.in> Wed, 30 November 2016 15:22 UTC
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From: Alissa Cooper <alissa@cooperw.in>
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Subject: [art] Alissa Cooper's No Objection on draft-ietf-appsawg-mdn-3798bis-15: (with COMMENT)
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Alissa Cooper has entered the following ballot position for draft-ietf-appsawg-mdn-3798bis-15: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-appsawg-mdn-3798bis/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Thanks for the good work to improve the privacy properties here. = Section 6.2 = "Disposition mode (Section 3.2.6.1) can leak information about recipient's MUA configuration, in particular whether MDNs are acknowledged manually or automatically. If this is a concern, MUAs can return "manual-action/MDN-sent-manually" disposition mode in generated MDNs." I see why this is here, but doesn't recommending falsifying these fields put their integrity in question whenever they are set to manual? I mean, why would recipients trust this information if the RFC actually suggests sending a field that lies about an MDN being automatically acknowledged? = Section 6.2.2 = "The "Reporting-UA" field (Section 3.2.1) might contain enough information to uniquely identify a specific device, usually when combined with other characteristics, particularly if the user agent sends excessive details about the user's system or extensions. However, the source of unique information that is least expected by users is proactive negotiation, including the Accept-Language header fields." I think the use of "However" is tripping me up here. Earlier in the document you have good recommendations about how to mitigate the risk of fingerprinting based on the Reporting-UA field. That guidance is valid regardless of whether other header fields might also contribute to fingerprinting or whether users would expect that (frankly, I don't see how user expectations are relevant here, since most users don't understand fingerprinting anyway). I think something along the following lines to replace the last sentence above would be more accurate: "Even when the guidance in Section 3.2.1 is followed to avoid fingerprinting, other sources of unique information may still be present, including the Accept-Language header fields."
- [art] Alissa Cooper's No Objection on draft-ietf-… Alissa Cooper
- Re: [art] Alissa Cooper's No Objection on draft-i… Barry Leiba
- Re: [art] Alissa Cooper's No Objection on draft-i… Alissa Cooper
- Re: [art] Alissa Cooper's No Objection on draft-i… Alexey Melnikov