Respond 400 + Reset to malformed request #748
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franfastly
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I'm not sure why clippy started complaining about this. I could amend this PR to appease clippy or push a fix in separate PR. |
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Could be a newer clippy being a jerk. |
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`h2` returns `RST_STREAM` frames with the `PROTOCOL_ERROR` bit set as a response to many types of errors in client requests. Many of those cases, when handled by an HTTP/1 server such as the one used in `hyper`, would result in an HTTP 400 Bad Request response returned to the client rather than a TCP reset (the HTTP/1 equivalent of a `RST_STREAM`). As a consequence, a client will observe differences in behaviour between HTTP/1 and HTTP/2: a malformed request will result in a 400 response when HTTP/1 is used whereas the same request will result in a reset stream with `h2`. Make `h2` reply a `HEADERS`+`400`+`END_STREAM` frame followed by a `RST_STREAM`+`PROTOCOL_ERROR` frame to all the `malformed!()` macro invocations in `Peer::convert_poll_message()` in `src/server.rs`. The `Reset` variant in the `h2::proto::error::Error` Enum now contains an `Option<http::StatusCode>` value that is set by the `malformed!()` macro with a `Some(400)`. That value is propagated all the way until `h2::proto::streams::send::Send::send_reset()` where, if not `None`, a `h2::frame::headers::Headers` frame with the status code and the `END_STREAM` flag set will now be sent to the client before the `RST_STREAM` frame. Some of the parameters passed to `send_reset()` have been grouped into a new `SendResetContext` Struct in order to avoid a `clippy::too_many_arguments` lint. Tests where malformed requests were sent have been updated to check that an additional `HEADERS`+`400`+`END_STREAM` frame is now received before the `RST_STREAM + PROTOCOL_ERROR` frame. This change has been validated with other clients like `curl`, a custom ad-hoc client written with `python3+httpx` and `varnishtest`.
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@seanmonstar I'm taking over this one from Fran while he's on vacation for the next few weeks. I would offer to do the review myself, but I'm the coauthor of the internal predecessor to this patch; it probably would be good to have a third party perspective before landing this change. |
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Hi! Is there anything I can do to help with the review of this PR? Thank you in advance! |
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h2returnsRST_STREAMframes with thePROTOCOL_ERRORbit set as a response to many types of errors in client requests. Many of those cases, when handled by an HTTP/1 server such as the one used inhyper, would result in an HTTP 400 Bad Request response returned to the client rather than a TCP reset (the HTTP/1 equivalent of aRST_STREAM). As a consequence, a client will observe differences in behaviour between HTTP/1 and HTTP/2: a malformed request will result in a 400 response when HTTP/1 is used whereas the same request will result in a reset stream withh2.This PR makes
h2reply aHEADERS+400+END_STREAMframe followed by aRST_STREAM+PROTOCOL_ERRORframe to all themalformed!()macro invocations inPeer::convert_poll_message()insrc/server.rs.The
Resetvariant in theh2::proto::error::ErrorEnum now contains anOption<http::StatusCode>value that is set by themalformed!()macro with aSome(400). That value is propagated all the way untilh2::proto::streams::send::Send::send_reset()where, if notNone, ah2::frame::headers::Headersframe with the status code and theEND_STREAMflag set will now be sent to the client before theRST_STREAMframe.Some of the parameters passed to
send_reset()have been grouped into a newSendResetContextStruct in order to avoid aclippy::too_many_argumentslint.Tests where malformed requests were sent have been updated to check that an additional
HEADERS+400+END_STREAMframe is now received before theRST_STREAM + PROTOCOL_ERRORframe.This change has been validated with other clients like
curl, a custom ad-hoc client written withpython3+httpxandvarnishtest.Fixes #747