Re: [quicwg/base-drafts] Import HTTP/2 Security Considerations (#3531)
Mike Bishop <notifications@github.com> Thu, 19 March 2020 12:42 UTC
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Date: Thu, 19 Mar 2020 05:42:31 -0700
From: Mike Bishop <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Import HTTP/2 Security Considerations (#3531)
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MikeBishop commented on this pull request. > +of establishing authority are discussed in Section 11.1 of {{!SEMANTICS}}. + +## Cross-Protocol Attacks + +The use of ALPN in the TLS and QUIC handshakes establishes the target +application protocol before application-layer bytes are processed. Because all +QUIC packets are encrypted, it is difficult for an attacker to control the +plaintext bytes of an HTTP/3 connection which could be used in a cross-protocol +attack on a plaintext protocol. + +## Intermediary Encapsulation Attacks + +The HTTP/3 field encoding allows the expression of names that are not valid +field names in the syntax used by HTTP (Section 4.3 of {{!SEMANTICS}}). Requests +or responses containing invalid field names MUST be treated as malformed +({{malformed}). An intermediary therefore cannot translate an HTTP/3 request or I don't think this is a new restriction; it's a statement about the ramifications of a compliant implementation. If you follow the previous MUST NOT, the ramification is that you cannot produce an invalid HTTP/1.1 request from an HTTP/3 request. > +Pushed responses for which an origin server is not authoritative (see +{{connection-reuse}}) MUST NOT be used or cached. If this were pointing to an expanded description of handling pushed responses, I think that would be the right arrangement. This is pointing specifically to a discussion of when a server is authoritative. > +denial-of-service attack. Implementations SHOULD track the use of these +features and set limits on their use. An endpoint MAY treat activity that is +suspicious as a connection error ({{errors}) of type H3_EXCESSIVE_LOAD. + +### Limits on Field Section Size + +A large field section ({{request-response}}) can cause an implementation to +commit a large amount of state. Header fields that are critical for routing can +appear toward the end of a header field section, which prevents streaming of the +header field section to its ultimate destination. This ordering and other +reasons, such as ensuring cache correctness, mean that an endpoint might need to +buffer the entire header field section. Since there is no hard limit to the +size of a field section, some endpoints could be forced to commit a large amount +of available memory for header fields. + +An endpoint can use the SETTINGS_MAX_HEADER_LIST_SIZE ({{settings-parameters}}) Seems to be up-to-date for now, though we might want to change it per #3452. -- 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/3531#discussion_r394994403
- [quicwg/base-drafts] Import HTTP/2 Security Consi… Mike Bishop
- Re: [quicwg/base-drafts] Import HTTP/2 Security C… Mike Bishop
- Re: [quicwg/base-drafts] Import HTTP/2 Security C… Martin Thomson
- Re: [quicwg/base-drafts] Import HTTP/2 Security C… Mike Bishop
- Re: [quicwg/base-drafts] Import HTTP/2 Security C… Mike Bishop
- Re: [quicwg/base-drafts] Import HTTP/2 Security C… Mike Bishop
- Re: [quicwg/base-drafts] Import HTTP/2 Security C… Mike Bishop
- Re: [quicwg/base-drafts] Import HTTP/2 Security C… Lucas Pardue
- Re: [quicwg/base-drafts] Import HTTP/2 Security C… Lucas Pardue
- Re: [quicwg/base-drafts] Import HTTP/2 Security C… Mike Bishop
- Re: [quicwg/base-drafts] Import HTTP/2 Security C… Mike Bishop
- Re: [quicwg/base-drafts] Import HTTP/2 Security C… Lucas Pardue
- Re: [quicwg/base-drafts] Import HTTP/2 Security C… ianswett
- Re: [quicwg/base-drafts] Import HTTP/2 Security C… Mike Bishop
- Re: [quicwg/base-drafts] Import HTTP/2 Security C… Mike Bishop
- Re: [quicwg/base-drafts] Import HTTP/2 Security C… Mike Bishop