mirror of
https://github.com/tailscale/tailscale.git
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74 lines
1.9 KiB
Go
74 lines
1.9 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build !js
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package ipnserver
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import (
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"io"
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"net"
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"net/http"
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"tailscale.com/logpolicy"
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)
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// handleProxyConnectConn handles a CONNECT request to
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// log.tailscale.io (or whatever the configured log server is). This
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// is intended for use by the Windows GUI client to log via when an
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// exit node is in use, so the logs don't go out via the exit node and
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// instead go directly, like tailscaled's. The dialer tried to do that
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// in the unprivileged GUI by binding to a specific interface, but the
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// "Internet Kill Switch" installed by tailscaled for exit nodes
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// precludes that from working and instead the GUI fails to dial out.
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// So, go through tailscaled (with a CONNECT request) instead.
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func (s *Server) handleProxyConnectConn(w http.ResponseWriter, r *http.Request) {
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ctx := r.Context()
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if r.Method != "CONNECT" {
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panic("[unexpected] miswired")
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}
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hostPort := r.RequestURI
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logHost := logpolicy.LogHost()
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allowed := net.JoinHostPort(logHost, "443")
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if hostPort != allowed {
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s.logf("invalid CONNECT target %q; want %q", hostPort, allowed)
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http.Error(w, "Bad CONNECT target.", http.StatusForbidden)
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return
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}
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dialContext := logpolicy.MakeDialFunc(s.netMon, s.logf)
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back, err := dialContext(ctx, "tcp", hostPort)
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if err != nil {
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s.logf("error CONNECT dialing %v: %v", hostPort, err)
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http.Error(w, "Connect failure", http.StatusBadGateway)
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return
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}
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defer back.Close()
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hj, ok := w.(http.Hijacker)
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if !ok {
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http.Error(w, "CONNECT hijack unavailable", http.StatusInternalServerError)
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return
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}
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c, br, err := hj.Hijack()
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if err != nil {
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s.logf("CONNECT hijack: %v", err)
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return
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}
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defer c.Close()
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io.WriteString(c, "HTTP/1.1 200 OK\r\n\r\n")
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errc := make(chan error, 2)
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go func() {
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_, err := io.Copy(c, back)
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errc <- err
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}()
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go func() {
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_, err := io.Copy(back, br)
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errc <- err
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}()
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<-errc
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}
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