mirror of https://github.com/tailscale/tailscale/
control/controlhttp: allow client and server to communicate over WebSockets
We can't do Noise-over-HTTP in Wasm/JS (because we don't have bidirectional communication), but we should be able to do it over WebSockets. Reuses derp WebSocket support that allows us to turn a WebSocket connection into a net.Conn. Updates #3157 Signed-off-by: Mihai Parparita <mihai@tailscale.com>pull/4802/head
Mihai Parparita
3 years ago
committed by
Mihai Parparita
parent
80157f3f37
commit
a9f32656f5
@ -0,0 +1,56 @@
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// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package controlhttp
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import (
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"context"
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"encoding/base64"
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"net"
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"net/url"
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"nhooyr.io/websocket"
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"tailscale.com/control/controlbase"
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"tailscale.com/net/dnscache"
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"tailscale.com/net/wsconn"
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"tailscale.com/types/key"
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)
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// Variant of Dial that tunnels the request over WebScokets, since we cannot do
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// bi-directional communication over an HTTP connection when in JS.
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func Dial(ctx context.Context, addr string, machineKey key.MachinePrivate, controlKey key.MachinePublic, protocolVersion uint16, dialer dnscache.DialContextFunc) (*controlbase.Conn, error) {
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init, cont, err := controlbase.ClientDeferred(machineKey, controlKey, protocolVersion)
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if err != nil {
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return nil, err
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}
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host, addr, err := net.SplitHostPort(addr)
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if err != nil {
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return nil, err
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}
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wsURL := &url.URL{
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Scheme: "ws",
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Host: net.JoinHostPort(host, addr),
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Path: serverUpgradePath,
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// Can't set HTTP headers on the websocket request, so we have to to send
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// the handshake via an HTTP header.
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RawQuery: url.Values{
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handshakeHeaderName: []string{base64.StdEncoding.EncodeToString(init)},
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}.Encode(),
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}
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wsConn, _, err := websocket.Dial(ctx, wsURL.String(), &websocket.DialOptions{
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Subprotocols: []string{upgradeHeaderValue},
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})
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if err != nil {
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return nil, err
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}
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netConn := wsconn.New(wsConn)
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cbConn, err := cont(ctx, netConn)
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if err != nil {
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netConn.Close()
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return nil, err
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}
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return cbConn, nil
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}
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@ -0,0 +1,20 @@
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// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package controlhttp
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const (
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// upgradeHeader is the value of the Upgrade HTTP header used to
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// indicate the Tailscale control protocol.
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upgradeHeaderValue = "tailscale-control-protocol"
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// handshakeHeaderName is the HTTP request header that can
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// optionally contain base64-encoded initial handshake
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// payload, to save an RTT.
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handshakeHeaderName = "X-Tailscale-Handshake"
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// serverUpgradePath is where the server-side HTTP handler to
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// to do the protocol switch is located.
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serverUpgradePath = "/ts2021"
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)
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