Re: [quicwg/base-drafts] What needs to be checked for address validation (#3327)
ekr <notifications@github.com> Tue, 04 February 2020 13:40 UTC
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Date: Tue, 04 Feb 2020 05:40:47 -0800
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Subject: Re: [quicwg/base-drafts] What needs to be checked for address validation (#3327)
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ekr commented on this pull request. > @@ -1814,10 +1814,13 @@ tokens that would be accepted by the server. Only the server requires access to the integrity protection key for tokens. There is no need for a single well-defined format for the token because the -server that generates the token also consumes it. A token could include -information about the claimed client address (IP and port), a timestamp, and any -other supplementary information the server will need to validate the token in -the future. +server that generates the token also consumes it. Tokens sent in Retry packets +SHOULD include information that allows the server to verify that the source IP I agree with @kazuho: suppose that one has a scheme where you store tokens, then the token wouldn't contain this information. Isn't the requirement here that the token be *bound* to an IP. > @@ -1814,10 +1814,13 @@ tokens that would be accepted by the server. Only the server requires access to the integrity protection key for tokens. There is no need for a single well-defined format for the token because the -server that generates the token also consumes it. A token could include -information about the claimed client address (IP and port), a timestamp, and any -other supplementary information the server will need to validate the token in -the future. +server that generates the token also consumes it. Tokens sent in Retry packets +SHOULD include information that allows the server to verify that the source IP +address and port in client packets remains constant. Servers MUST ensure that +replay of tokens is prevented or limited. For instance, servers might limit the +time over which a token is accepted. Tokens sent in NEW_TOKEN frames MAY omit +the client port and allow for use over a longer period. Tokens MAY include +additional information about clients to further narrow applicability or reuse. This is actually a pretty confusing situation that the document sees to handle badly. Suppose that a client connects with address 1.2.3.4 and the server issues a NEW_TOKEN with address 1.2.3.4. When the client comes back it has 5.6.7.8. The server might accept the token for purposes of anti-DoS (e.g., it might otherwise send Retry), but should not accept it for the purposes of exempting the client from the anti-amplification limits. -- 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/3327#discussion_r374672269
- [quicwg/base-drafts] What needs to be checked for… Martin Thomson
- Re: [quicwg/base-drafts] What needs to be checked… ianswett
- Re: [quicwg/base-drafts] What needs to be checked… Eric Kinnear
- Re: [quicwg/base-drafts] What needs to be checked… Mike Bishop
- Re: [quicwg/base-drafts] What needs to be checked… Kazuho Oku
- Re: [quicwg/base-drafts] What needs to be checked… ekr
- Re: [quicwg/base-drafts] What needs to be checked… Martin Thomson
- Re: [quicwg/base-drafts] What needs to be checked… Martin Thomson
- Re: [quicwg/base-drafts] What needs to be checked… Martin Thomson
- Re: [quicwg/base-drafts] What needs to be checked… Kazuho Oku
- Re: [quicwg/base-drafts] What needs to be checked… Martin Thomson
- Re: [quicwg/base-drafts] What needs to be checked… Kazuho Oku
- Re: [quicwg/base-drafts] What needs to be checked… Martin Thomson
- Re: [quicwg/base-drafts] What needs to be checked… Martin Thomson
- Re: [quicwg/base-drafts] What needs to be checked… ekr
- Re: [quicwg/base-drafts] What needs to be checked… Martin Thomson
- Re: [quicwg/base-drafts] What needs to be checked… Kazuho Oku
- Re: [quicwg/base-drafts] What needs to be checked… Martin Thomson
- Re: [quicwg/base-drafts] What needs to be checked… ekr
- Re: [quicwg/base-drafts] What needs to be checked… Martin Thomson
- Re: [quicwg/base-drafts] What needs to be checked… Martin Thomson
- Re: [quicwg/base-drafts] What needs to be checked… Martin Thomson
- Re: [quicwg/base-drafts] What needs to be checked… ekr
- Re: [quicwg/base-drafts] What needs to be checked… Martin Thomson
- Re: [quicwg/base-drafts] What needs to be checked… Kazuho Oku
- Re: [quicwg/base-drafts] What needs to be checked… Martin Thomson