Re: [quicwg/base-drafts] Define an anti-forgery limit (#3620)
Martin Thomson <notifications@github.com> Fri, 08 May 2020 00:07 UTC
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Date: Thu, 07 May 2020 17:07:28 -0700
From: Martin Thomson <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Define an anti-forgery limit (#3620)
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@martinthomson commented on this pull request. > +integrity protections in authenticated encryption also depend on limiting the +number of attempts to forge packets. TLS achieves this by closing connections +after any record fails an authentication check. In comparison, QUIC ignores any +packet that cannot be authenticated, allowing multiple attempts at defeating +integrity protection. + +Endpoints MUST count the number of packets that are received but cannot be +authenticated. Packet protection keys MUST NOT be used for removing packet +protection after authentication fails on more than a limit that is specific to +the AEAD in use. Endpoints MUST initiate a key update before reaching this +limit. Applying a limit reduces the probability that an attacker is able to +successfully forge a packet; see {{AEBounds}} and {{ROBUST}}. + +For AEAD_AES_128_GCM, AEAD_AES_256_GCM, and AEAD_CHACHA20_POLY1305, if the +number of packets that fail authentication exceeds 2^36, the endpoint MUST +immediately close the connection. Note that the analysis in {{AEBounds}} My thinking was that this is the necessary reaction if the key update was not successful before this limit was reached. That we require a key update to be initiated before this is reached isn't any guarantee that the key update will succeed. -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/quicwg/base-drafts/pull/3620#discussion_r421862841
- Re: [quicwg/base-drafts] Define an anti-forgery l… Martin Thomson
- Re: [quicwg/base-drafts] Define an anti-forgery l… Martin Thomson
- Re: [quicwg/base-drafts] Define an anti-forgery l… Martin Thomson
- Re: [quicwg/base-drafts] Define an anti-forgery l… Martin Thomson
- [quicwg/base-drafts] Define an anti-forgery limit… Martin Thomson
- Re: [quicwg/base-drafts] Define an anti-forgery l… Martin Thomson
- Re: [quicwg/base-drafts] Define an anti-forgery l… Martin Thomson
- Re: [quicwg/base-drafts] Define an anti-forgery l… ianswett
- Re: [quicwg/base-drafts] Define an anti-forgery l… Martin Thomson
- Re: [quicwg/base-drafts] Define an anti-forgery l… Lucas Pardue
- Re: [quicwg/base-drafts] Define an anti-forgery l… Jana Iyengar
- Re: [quicwg/base-drafts] Define an anti-forgery l… Martin Thomson
- Re: [quicwg/base-drafts] Define an anti-forgery l… Martin Thomson
- Re: [quicwg/base-drafts] Define an anti-forgery l… Kazuho Oku
- Re: [quicwg/base-drafts] Define an anti-forgery l… Martin Thomson
- Re: [quicwg/base-drafts] Define an anti-forgery l… Kazuho Oku
- Re: [quicwg/base-drafts] Define an anti-forgery l… Martin Thomson
- Re: [quicwg/base-drafts] Define an anti-forgery l… Felix Günther
- Re: [quicwg/base-drafts] Define an anti-forgery l… Martin Thomson
- Re: [quicwg/base-drafts] Define an anti-forgery l… Martin Thomson
- Re: [quicwg/base-drafts] Define an anti-forgery l… Christopher Wood
- Re: [quicwg/base-drafts] Define an anti-forgery l… Felix Günther
- Re: [quicwg/base-drafts] Define an anti-forgery l… Christopher Wood
- Re: [quicwg/base-drafts] Define an anti-forgery l… David Schinazi
- Re: [quicwg/base-drafts] Define an anti-forgery l… Martin Thomson
- Re: [quicwg/base-drafts] Define an anti-forgery l… Martin Thomson
- Re: [quicwg/base-drafts] Define an anti-forgery l… Martin Thomson
- Re: [quicwg/base-drafts] Define an anti-forgery l… Christopher Wood
- Re: [quicwg/base-drafts] Define an anti-forgery l… Jana Iyengar
- Re: [quicwg/base-drafts] Define an anti-forgery l… David Schinazi
- Re: [quicwg/base-drafts] Define an anti-forgery l… Christopher Wood
- Re: [quicwg/base-drafts] Define an anti-forgery l… David Schinazi
- Re: [quicwg/base-drafts] Define an anti-forgery l… Christopher Wood
- Re: [quicwg/base-drafts] Define an anti-forgery l… Martin Thomson
- Re: [quicwg/base-drafts] Define an anti-forgery l… Martin Thomson