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Alt-Svc in Security Considerations #1686

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Aug 27, 2018
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Alt-Svc in Security Considerations #1686

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Alt-Svc in SC
MikeBishop Aug 20, 2018
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MikeBishop Aug 27, 2018
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8 changes: 6 additions & 2 deletions draft-ietf-quic-http.md
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Expand Up @@ -143,8 +143,9 @@ coordinate their experiments on the quic@ietf.org mailing list.
## Discovering an HTTP/QUIC Endpoint

An HTTP origin advertises the availability of an equivalent HTTP/QUIC endpoint
via the Alt-Svc HTTP response header or the HTTP/2 ALTSVC frame ({{!RFC7838}}),
using the ALPN token defined in {{connection-establishment}}.
via the Alt-Svc HTTP response header field or the HTTP/2 ALTSVC frame
({{!ALTSVC=RFC7838}}), using the ALPN token defined in
{{connection-establishment}}.

For example, an origin could indicate in an HTTP/1.1 or HTTP/2 response that
HTTP/QUIC was available on UDP port 50781 at the same hostname by including the
Expand Down Expand Up @@ -1523,6 +1524,9 @@ connection more resistant to traffic analysis, HTTP/QUIC can rely on QUIC's own
PADDING frames or employ the reserved frame and stream types discussed in
{{frame-grease}} and {{stream-grease}}.

When HTTP Alternative Services is used for discovery for HTTP/QUIC endpoints,
the security considerations of {{!ALTSVC}} also apply.

The modified SETTINGS format contains nested length elements, which could pose
a security risk to an incautious implementer. A SETTINGS frame parser MUST
ensure that the length of the frame exactly matches the length of the settings
Expand Down