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net/http/httputil: add X-Forwarded-{Host,Proto} headers in ReverseProxy
X-Forwarded-Host contains the original request's host. X-Forwarded-Proto contains "http" or "https", depending on whether the original request was made on a TLS-secured connection. Setting either header to nil in Director disables adding the header, same as for X-Forwarded-For. Fixes #50465. Change-Id: If8ed1f48d83f8ea0389c53519bc7994cb53891db Reviewed-on: https://go-review.googlesource.com/c/go/+/407414 Reviewed-by: Michael Knyszek <mknyszek@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Run-TryBot: Damien Neil <dneil@google.com> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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@ -28,14 +28,18 @@ import (
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// sends it to another server, proxying the response back to the
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// client.
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//
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// ReverseProxy by default sets the client IP as the value of the
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// X-Forwarded-For header.
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// ReverseProxy by default sets
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// - the X-Forwarded-For header to the client IP address;
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// - the X-Forwarded-Host header to the host of the original client
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// request; and
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// - the X-Forwarded-Proto header to "https" if the client request
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// was made on a TLS-enabled connection or "http" otherwise.
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//
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// If an X-Forwarded-For header already exists, the client IP is
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// appended to the existing values. As a special case, if the header
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// exists in the Request.Header map but has a nil value (such as when
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// set by the Director func), the X-Forwarded-For header is
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// not modified.
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// appended to the existing values.
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//
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// If a header exists in the Request.Header map but has a nil value
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// (such as when set by the Director func), it is not modified.
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//
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// To prevent IP spoofing, be sure to delete any pre-existing
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// X-Forwarded-For header coming from the client or
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@ -306,6 +310,16 @@ func (p *ReverseProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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outreq.Header.Set("X-Forwarded-For", clientIP)
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}
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}
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if prior, ok := outreq.Header["X-Forwarded-Host"]; !(ok && prior == nil) {
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outreq.Header.Set("X-Forwarded-Host", req.Host)
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}
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if prior, ok := outreq.Header["X-Forwarded-Proto"]; !(ok && prior == nil) {
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if req.TLS == nil {
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outreq.Header.Set("X-Forwarded-Proto", "http")
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} else {
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outreq.Header.Set("X-Forwarded-Proto", "https")
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}
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}
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res, err := transport.RoundTrip(outreq)
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if err != nil {
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@ -50,6 +50,12 @@ func TestReverseProxy(t *testing.T) {
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if r.Header.Get("X-Forwarded-For") == "" {
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t.Errorf("didn't get X-Forwarded-For header")
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}
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if r.Header.Get("X-Forwarded-Host") == "" {
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t.Errorf("didn't get X-Forwarded-Host header")
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}
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if r.Header.Get("X-Forwarded-Proto") == "" {
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t.Errorf("didn't get X-Forwarded-Proto header")
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}
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if c := r.Header.Get("Connection"); c != "" {
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t.Errorf("handler got Connection header value %q", c)
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}
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@ -299,6 +305,7 @@ func TestXForwardedFor(t *testing.T) {
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const prevForwardedFor = "client ip"
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const backendResponse = "I am the backend"
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const backendStatus = 404
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const host = "some-name"
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backend := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if r.Header.Get("X-Forwarded-For") == "" {
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t.Errorf("didn't get X-Forwarded-For header")
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@ -306,6 +313,12 @@ func TestXForwardedFor(t *testing.T) {
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if !strings.Contains(r.Header.Get("X-Forwarded-For"), prevForwardedFor) {
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t.Errorf("X-Forwarded-For didn't contain prior data")
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}
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if got, want := r.Header.Get("X-Forwarded-Host"), host; got != want {
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t.Errorf("X-Forwarded-Host = %q, want %q", got, want)
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}
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if got, want := r.Header.Get("X-Forwarded-Proto"), "http"; got != want {
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t.Errorf("X-Forwarded-Proto = %q, want %q", got, want)
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}
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w.WriteHeader(backendStatus)
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w.Write([]byte(backendResponse))
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}))
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@ -319,7 +332,7 @@ func TestXForwardedFor(t *testing.T) {
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defer frontend.Close()
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getReq, _ := http.NewRequest("GET", frontend.URL, nil)
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getReq.Host = "some-name"
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getReq.Host = host
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getReq.Header.Set("Connection", "close")
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getReq.Header.Set("X-Forwarded-For", prevForwardedFor)
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getReq.Close = true
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@ -336,11 +349,36 @@ func TestXForwardedFor(t *testing.T) {
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}
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}
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func TestXForwardedProtoTLS(t *testing.T) {
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backend := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if got, want := r.Header.Get("X-Forwarded-Proto"), "https"; got != want {
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t.Errorf("X-Forwarded-Proto = %q, want %q", got, want)
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}
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}))
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defer backend.Close()
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backendURL, err := url.Parse(backend.URL)
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if err != nil {
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t.Fatal(err)
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}
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proxyHandler := NewSingleHostReverseProxy(backendURL)
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frontend := httptest.NewTLSServer(proxyHandler)
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defer frontend.Close()
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getReq, _ := http.NewRequest("GET", frontend.URL, nil)
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getReq.Host = "some-host"
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_, err = frontend.Client().Do(getReq)
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if err != nil {
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t.Fatalf("Get: %v", err)
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}
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}
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// Issue 38079: don't append to X-Forwarded-For if it's present but nil
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func TestXForwardedFor_Omit(t *testing.T) {
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backend := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if v := r.Header.Get("X-Forwarded-For"); v != "" {
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t.Errorf("got X-Forwarded-For header: %q", v)
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for _, h := range []string{"X-Forwarded-For", "X-Forwarded-Host", "X-Forwarded-Proto"} {
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if v := r.Header.Get(h); v != "" {
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t.Errorf("got %v header: %q", h, v)
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}
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}
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w.Write([]byte("hi"))
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}))
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@ -356,6 +394,8 @@ func TestXForwardedFor_Omit(t *testing.T) {
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oldDirector := proxyHandler.Director
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proxyHandler.Director = func(r *http.Request) {
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r.Header["X-Forwarded-For"] = nil
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r.Header["X-Forwarded-Host"] = nil
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r.Header["X-Forwarded-Proto"] = nil
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oldDirector(r)
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}
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@ -1029,13 +1069,16 @@ func TestClonesRequestHeaders(t *testing.T) {
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}
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rp.ServeHTTP(httptest.NewRecorder(), req)
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if req.Header.Get("From-Director") == "1" {
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t.Error("Director header mutation modified caller's request")
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for _, h := range []string{
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"From-Director",
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"X-Forwarded-For",
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"X-Forwarded-Host",
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"X-Forwarded-Proto",
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} {
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if req.Header.Get(h) != "" {
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t.Errorf("%v header mutation modified caller's request", h)
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}
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}
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if req.Header.Get("X-Forwarded-For") != "" {
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t.Error("X-Forward-For header mutation modified caller's request")
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}
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}
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type roundTripperFunc func(req *http.Request) (*http.Response, error)
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