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Internal HTTP APIs over H2C (#1541)

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* H2C on internal HTTP because SCIENCE

* Update comments
This commit is contained in:
Neil Alexander 2020-10-20 17:13:12 +01:00 committed by GitHub
parent 7ca89ef511
commit 24e38c4135
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 29 additions and 2 deletions
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1
go.mod
View file

@ -40,6 +40,7 @@ require (
github.com/yggdrasil-network/yggdrasil-go v0.3.15-0.20201006093556-760d9a7fd5ee
go.uber.org/atomic v1.6.0
golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a
golang.org/x/net v0.0.0-20200528225125-3c3fba18258b
gopkg.in/h2non/bimg.v1 v1.1.4
gopkg.in/yaml.v2 v2.3.0
)

30
internal/setup/base.go
View file

@ -15,8 +15,10 @@
package setup
import (
"crypto/tls"
"fmt"
"io"
"net"
"net/http"
"net/url"
"time"
@ -25,6 +27,8 @@ import (
"github.com/matrix-org/dendrite/internal/httputil"
"github.com/matrix-org/gomatrixserverlib"
"github.com/prometheus/client_golang/prometheus/promhttp"
"golang.org/x/net/http2"
"golang.org/x/net/http2/h2c"
"github.com/matrix-org/dendrite/internal"
"github.com/matrix-org/dendrite/userapi/storage/accounts"
@ -107,7 +111,22 @@ func NewBaseDendrite(cfg *config.Dendrite, componentName string, useHTTPAPIs boo
logrus.WithError(err).Warnf("Failed to create cache")
}
apiClient := http.Client{Timeout: time.Minute * 10}
apiClient := http.Client{
Timeout: time.Minute * 10,
Transport: &http2.Transport{
AllowHTTP: true,
DialTLS: func(network, addr string, _ *tls.Config) (net.Conn, error) {
// Ordinarily HTTP/2 would expect TLS, but the remote listener is
// H2C-enabled (HTTP/2 without encryption). Overriding the DialTLS
// function with a plain Dial allows us to trick the HTTP client
// into establishing a HTTP/2 connection without TLS.
// TODO: Eventually we will want to look at authenticating and
// encrypting these internal HTTP APIs, at which point we will have
// to reconsider H2C and change all this anyway.
return net.Dial(network, addr)
},
},
}
client := http.Client{Timeout: HTTPClientTimeout}
if cfg.FederationSender.Proxy.Enabled {
client.Transport = &http.Transport{Proxy: http.ProxyURL(&url.URL{
@ -269,10 +288,17 @@ func (b *BaseDendrite) SetupAndServeHTTP(
internalServ := externalServ
if internalAddr != NoListener && externalAddr != internalAddr {
// H2C allows us to accept HTTP/2 connections without TLS
// encryption. Since we don't currently require any form of
// authentication or encryption on these internal HTTP APIs,
// H2C gives us all of the advantages of HTTP/2 (such as
// stream multiplexing and avoiding head-of-line blocking)
// without enabling TLS.
internalH2S := &http2.Server{}
internalRouter = mux.NewRouter().SkipClean(true).UseEncodedPath()
internalServ = &http.Server{
Addr: string(internalAddr),
Handler: internalRouter,
Handler: h2c.NewHandler(internalRouter, internalH2S),
}
}