[release-branch.go1.22] net/http: persist header stripping across repeated redirects

When an HTTP redirect changes the host of a request, we drop
sensitive headers such as Authorization from the redirected request.
Fix a bug where a chain of redirects could result in sensitive
headers being sent to the wrong host:

  1. request to a.tld with Authorization header
  2. a.tld redirects to b.tld
  3. request to b.tld with no Authorization header
  4. b.tld redirects to b.tld
  3. request to b.tld with Authorization header restored

Thanks to Kyle Seely for reporting this issue.

Fixes #70530
For #71210
Fixes CVE-2024-45336

Reviewed-on: https://go-internal-review.googlesource.com/c/go/+/1641
Reviewed-by: Roland Shoemaker <[email protected]>
Reviewed-by: Tatiana Bradley <[email protected]>
Commit-Queue: Roland Shoemaker <[email protected]>
Change-Id: Id7b1e3c90345566b8ee1a51f65dbb179da6eb427
Reviewed-on: https://go-internal-review.googlesource.com/c/go/+/1765
Reviewed-on: https://go-review.googlesource.com/c/go/+/643106
Reviewed-by: Michael Pratt <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Auto-Submit: Michael Knyszek <[email protected]>

Author: neild

src/net/http/client.go

@@ -612,8 +612,9 @@ func (c *Client) do(req *Request) (retres *Response, reterr error) {
 		reqBodyClosed = false // have we closed the current req.Body?
 
 		// Redirect behavior:
-		redirectMethod string
-		includeBody    bool
+		redirectMethod        string
+		includeBody           = true
+		stripSensitiveHeaders = false
 	)
 	uerr := func(err error) error {
 		// the body may have been closed already by c.send()
@@ -680,7 +681,12 @@ func (c *Client) do(req *Request) (retres *Response, reterr error) {
 			// in case the user set Referer on their first request.
 			// If they really want to override, they can do it in
 			// their CheckRedirect func.
-			copyHeaders(req)
+			if !stripSensitiveHeaders && reqs[0].URL.Host != req.URL.Host {
+				if !shouldCopyHeaderOnRedirect(reqs[0].URL, req.URL) {
+					stripSensitiveHeaders = true
+				}
+			}
+			copyHeaders(req, stripSensitiveHeaders)
 
 			// Add the Referer header from the most recent
 			// request URL to the new one, if it's not https->http:
@@ -746,7 +752,7 @@ func (c *Client) do(req *Request) (retres *Response, reterr error) {
 // makeHeadersCopier makes a function that copies headers from the
 // initial Request, ireq. For every redirect, this function must be called
 // so that it can copy headers into the upcoming Request.
-func (c *Client) makeHeadersCopier(ireq *Request) func(*Request) {
+func (c *Client) makeHeadersCopier(ireq *Request) func(req *Request, stripSensitiveHeaders bool) {
 	// The headers to copy are from the very initial request.
 	// We use a closured callback to keep a reference to these original headers.
 	var (
@@ -760,8 +766,7 @@ func (c *Client) makeHeadersCopier(ireq *Request) func(*Request) {
 		}
 	}
 
-	preq := ireq // The previous request
-	return func(req *Request) {
+	return func(req *Request, stripSensitiveHeaders bool) {
 		// If Jar is present and there was some initial cookies provided
 		// via the request header, then we may need to alter the initial
 		// cookies as we follow redirects since each redirect may end up
@@ -798,12 +803,15 @@ func (c *Client) makeHeadersCopier(ireq *Request) func(*Request) {
 		// Copy the initial request's Header values
 		// (at least the safe ones).
 		for k, vv := range ireqhdr {
-			if shouldCopyHeaderOnRedirect(k, preq.URL, req.URL) {
+			sensitive := false
+			switch CanonicalHeaderKey(k) {
+			case "Authorization", "Www-Authenticate", "Cookie", "Cookie2":
+				sensitive = true
+			}
+			if !(sensitive && stripSensitiveHeaders) {
 				req.Header[k] = vv
 			}
 		}
-
-		preq = req // Update previous Request with the current request
 	}
 }
 
@@ -982,28 +990,23 @@ func (b *cancelTimerBody) Close() error {
 	return err
 }
 
-func shouldCopyHeaderOnRedirect(headerKey string, initial, dest *url.URL) bool {
-	switch CanonicalHeaderKey(headerKey) {
-	case "Authorization", "Www-Authenticate", "Cookie", "Cookie2":
-		// Permit sending auth/cookie headers from "foo.com"
-		// to "sub.foo.com".
-
-		// Note that we don't send all cookies to subdomains
-		// automatically. This function is only used for
-		// Cookies set explicitly on the initial outgoing
-		// client request. Cookies automatically added via the
-		// CookieJar mechanism continue to follow each
-		// cookie's scope as set by Set-Cookie. But for
-		// outgoing requests with the Cookie header set
-		// directly, we don't know their scope, so we assume
-		// it's for *.domain.com.
-
-		ihost := idnaASCIIFromURL(initial)
-		dhost := idnaASCIIFromURL(dest)
-		return isDomainOrSubdomain(dhost, ihost)
-	}
-	// All other headers are copied:
-	return true
+func shouldCopyHeaderOnRedirect(initial, dest *url.URL) bool {
+	// Permit sending auth/cookie headers from "foo.com"
+	// to "sub.foo.com".
+
+	// Note that we don't send all cookies to subdomains
+	// automatically. This function is only used for
+	// Cookies set explicitly on the initial outgoing
+	// client request. Cookies automatically added via the
+	// CookieJar mechanism continue to follow each
+	// cookie's scope as set by Set-Cookie. But for
+	// outgoing requests with the Cookie header set
+	// directly, we don't know their scope, so we assume
+	// it's for *.domain.com.
+
+	ihost := idnaASCIIFromURL(initial)
+	dhost := idnaASCIIFromURL(dest)
+	return isDomainOrSubdomain(dhost, ihost)
 }
 
 // isDomainOrSubdomain reports whether sub is a subdomain (or exact

src/net/http/client_test.go

@@ -1530,6 +1530,55 @@ func testClientCopyHeadersOnRedirect(t *testing.T, mode testMode) {
 	}
 }
 
+// Issue #70530: Once we strip a header on a redirect to a different host,
+// the header should stay stripped across any further redirects.
+func TestClientStripHeadersOnRepeatedRedirect(t *testing.T) {
+	run(t, testClientStripHeadersOnRepeatedRedirect)
+}
+func testClientStripHeadersOnRepeatedRedirect(t *testing.T, mode testMode) {
+	var proto string
+	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
+		if r.Host+r.URL.Path != "a.example.com/" {
+			if h := r.Header.Get("Authorization"); h != "" {
+				t.Errorf("on request to %v%v, Authorization=%q, want no header", r.Host, r.URL.Path, h)
+			}
+		}
+		// Follow a chain of redirects from a to b and back to a.
+		// The Authorization header is stripped on the first redirect to b,
+		// and stays stripped even if we're sent back to a.
+		switch r.Host + r.URL.Path {
+		case "a.example.com/":
+			Redirect(w, r, proto+"://b.example.com/", StatusFound)
+		case "b.example.com/":
+			Redirect(w, r, proto+"://b.example.com/redirect", StatusFound)
+		case "b.example.com/redirect":
+			Redirect(w, r, proto+"://a.example.com/redirect", StatusFound)
+		case "a.example.com/redirect":
+			w.Header().Set("X-Done", "true")
+		default:
+			t.Errorf("unexpected request to %v", r.URL)
+		}
+	})).ts
+	proto, _, _ = strings.Cut(ts.URL, ":")
+
+	c := ts.Client()
+	c.Transport.(*Transport).Dial = func(_ string, _ string) (net.Conn, error) {
+		return net.Dial("tcp", ts.Listener.Addr().String())
+	}
+
+	req, _ := NewRequest("GET", proto+"://a.example.com/", nil)
+	req.Header.Add("Cookie", "foo=bar")
+	req.Header.Add("Authorization", "secretpassword")
+	res, err := c.Do(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer res.Body.Close()
+	if res.Header.Get("X-Done") != "true" {
+		t.Fatalf("response missing expected header: X-Done=true")
+	}
+}
+
 // Issue 22233: copy host when Client follows a relative redirect.
 func TestClientCopyHostOnRedirect(t *testing.T) { run(t, testClientCopyHostOnRedirect) }
 func testClientCopyHostOnRedirect(t *testing.T, mode testMode) {
@@ -1696,43 +1745,39 @@ func testClientAltersCookiesOnRedirect(t *testing.T, mode testMode) {
 // Part of Issue 4800
 func TestShouldCopyHeaderOnRedirect(t *testing.T) {
 	tests := []struct {
-		header     string
 		initialURL string
 		destURL    string
 		want       bool
 	}{
-		{"User-Agent", "http://foo.com/", "http://bar.com/", true},
-		{"X-Foo", "http://foo.com/", "http://bar.com/", true},
-
 		// Sensitive headers:
-		{"cookie", "http://foo.com/", "http://bar.com/", false},
-		{"cookie2", "http://foo.com/", "http://bar.com/", false},
-		{"authorization", "http://foo.com/", "http://bar.com/", false},
-		{"authorization", "http://foo.com/", "https://foo.com/", true},
-		{"authorization", "http://foo.com:1234/", "http://foo.com:4321/", true},
-		{"www-authenticate", "http://foo.com/", "http://bar.com/", false},
-		{"authorization", "http://foo.com/", "http://[::1%25.foo.com]/", false},
+		{"http://foo.com/", "http://bar.com/", false},
+		{"http://foo.com/", "http://bar.com/", false},
+		{"http://foo.com/", "http://bar.com/", false},
+		{"http://foo.com/", "https://foo.com/", true},
+		{"http://foo.com:1234/", "http://foo.com:4321/", true},
+		{"http://foo.com/", "http://bar.com/", false},
+		{"http://foo.com/", "http://[::1%25.foo.com]/", false},
 
 		// But subdomains should work:
-		{"www-authenticate", "http://foo.com/", "http://foo.com/", true},
-		{"www-authenticate", "http://foo.com/", "http://sub.foo.com/", true},
-		{"www-authenticate", "http://foo.com/", "http://notfoo.com/", false},
-		{"www-authenticate", "http://foo.com/", "https://foo.com/", true},
-		{"www-authenticate", "http://foo.com:80/", "http://foo.com/", true},
-		{"www-authenticate", "http://foo.com:80/", "http://sub.foo.com/", true},
-		{"www-authenticate", "http://foo.com:443/", "https://foo.com/", true},
-		{"www-authenticate", "http://foo.com:443/", "https://sub.foo.com/", true},
-		{"www-authenticate", "http://foo.com:1234/", "http://foo.com/", true},
-
-		{"authorization", "http://foo.com/", "http://foo.com/", true},
-		{"authorization", "http://foo.com/", "http://sub.foo.com/", true},
-		{"authorization", "http://foo.com/", "http://notfoo.com/", false},
-		{"authorization", "http://foo.com/", "https://foo.com/", true},
-		{"authorization", "http://foo.com:80/", "http://foo.com/", true},
-		{"authorization", "http://foo.com:80/", "http://sub.foo.com/", true},
-		{"authorization", "http://foo.com:443/", "https://foo.com/", true},
-		{"authorization", "http://foo.com:443/", "https://sub.foo.com/", true},
-		{"authorization", "http://foo.com:1234/", "http://foo.com/", true},
+		{"http://foo.com/", "http://foo.com/", true},
+		{"http://foo.com/", "http://sub.foo.com/", true},
+		{"http://foo.com/", "http://notfoo.com/", false},
+		{"http://foo.com/", "https://foo.com/", true},
+		{"http://foo.com:80/", "http://foo.com/", true},
+		{"http://foo.com:80/", "http://sub.foo.com/", true},
+		{"http://foo.com:443/", "https://foo.com/", true},
+		{"http://foo.com:443/", "https://sub.foo.com/", true},
+		{"http://foo.com:1234/", "http://foo.com/", true},
+
+		{"http://foo.com/", "http://foo.com/", true},
+		{"http://foo.com/", "http://sub.foo.com/", true},
+		{"http://foo.com/", "http://notfoo.com/", false},
+		{"http://foo.com/", "https://foo.com/", true},
+		{"http://foo.com:80/", "http://foo.com/", true},
+		{"http://foo.com:80/", "http://sub.foo.com/", true},
+		{"http://foo.com:443/", "https://foo.com/", true},
+		{"http://foo.com:443/", "https://sub.foo.com/", true},
+		{"http://foo.com:1234/", "http://foo.com/", true},
 	}
 	for i, tt := range tests {
 		u0, err := url.Parse(tt.initialURL)
@@ -1745,10 +1790,10 @@ func TestShouldCopyHeaderOnRedirect(t *testing.T) {
 			t.Errorf("%d. dest URL %q parse error: %v", i, tt.destURL, err)
 			continue
 		}
-		got := Export_shouldCopyHeaderOnRedirect(tt.header, u0, u1)
+		got := Export_shouldCopyHeaderOnRedirect(u0, u1)
 		if got != tt.want {
-			t.Errorf("%d. shouldCopyHeaderOnRedirect(%q, %q => %q) = %v; want %v",
-				i, tt.header, tt.initialURL, tt.destURL, got, tt.want)
+			t.Errorf("%d. shouldCopyHeaderOnRedirect(%q => %q) = %v; want %v",
+				i, tt.initialURL, tt.destURL, got, tt.want)
 		}
 	}
 }

src/net/http/internal/testcert/testcert.go

@@ -10,56 +10,56 @@ import "strings"
 // LocalhostCert is a PEM-encoded TLS cert with SAN IPs
 // "127.0.0.1" and "[::1]", expiring at Jan 29 16:00:00 2084 GMT.
 // generated from src/crypto/tls:
-// go run generate_cert.go  --rsa-bits 2048 --host 127.0.0.1,::1,example.com --ca --start-date "Jan 1 00:00:00 1970" --duration=1000000h
+// go run generate_cert.go  --rsa-bits 2048 --host 127.0.0.1,::1,example.com,*.example.com --ca --start-date "Jan 1 00:00:00 1970" --duration=1000000h
 var LocalhostCert = []byte(`-----BEGIN CERTIFICATE-----
-MIIDOTCCAiGgAwIBAgIQSRJrEpBGFc7tNb1fb5pKFzANBgkqhkiG9w0BAQsFADAS
+MIIDSDCCAjCgAwIBAgIQEP/md970HysdBTpuzDOf0DANBgkqhkiG9w0BAQsFADAS
 MRAwDgYDVQQKEwdBY21lIENvMCAXDTcwMDEwMTAwMDAwMFoYDzIwODQwMTI5MTYw
 MDAwWjASMRAwDgYDVQQKEwdBY21lIENvMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8A
-MIIBCgKCAQEA6Gba5tHV1dAKouAaXO3/ebDUU4rvwCUg/CNaJ2PT5xLD4N1Vcb8r
-bFSW2HXKq+MPfVdwIKR/1DczEoAGf/JWQTW7EgzlXrCd3rlajEX2D73faWJekD0U
-aUgz5vtrTXZ90BQL7WvRICd7FlEZ6FPOcPlumiyNmzUqtwGhO+9ad1W5BqJaRI6P
-YfouNkwR6Na4TzSj5BrqUfP0FwDizKSJ0XXmh8g8G9mtwxOSN3Ru1QFc61Xyeluk
-POGKBV/q6RBNklTNe0gI8usUMlYyoC7ytppNMW7X2vodAelSu25jgx2anj9fDVZu
-h7AXF5+4nJS4AAt0n1lNY7nGSsdZas8PbQIDAQABo4GIMIGFMA4GA1UdDwEB/wQE
+MIIBCgKCAQEAxcl69ROJdxjN+MJZnbFrYxyQooADCsJ6VDkuMyNQIix/Hk15Nk/u
+FyBX1Me++aEpGmY3RIY4fUvELqT/srvAHsTXwVVSttMcY8pcAFmXSqo3x4MuUTG/
+jCX3Vftj0r3EM5M8ImY1rzA/jqTTLJg00rD+DmuDABcqQvoXw/RV8w1yTRi5BPoH
+DFD/AWTt/YgMvk1l2Yq/xI8VbMUIpjBoGXxWsSevQ5i2s1mk9/yZzu0Ysp1tTlzD
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+U2WMqAEpRjdE/vHfIuNg+yGaRRqI07NZRQIDAQABo4GXMIGUMA4GA1UdDwEB/wQE
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-DgQWBBStsdjh3/JCXXYlQryOrL4Sh7BW5TAuBgNVHREEJzAlggtleGFtcGxlLmNv
-bYcEfwAAAYcQAAAAAAAAAAAAAAAAAAAAATANBgkqhkiG9w0BAQsFAAOCAQEAxWGI
-5NhpF3nwwy/4yB4i/CwwSpLrWUa70NyhvprUBC50PxiXav1TeDzwzLx/o5HyNwsv
-cxv3HdkLW59i/0SlJSrNnWdfZ19oTcS+6PtLoVyISgtyN6DpkKpdG1cOkW3Cy2P2
-+tK/tKHRP1Y/Ra0RiDpOAmqn0gCOFGz8+lqDIor/T7MTpibL3IxqWfPrvfVRHL3B
-grw/ZQTTIVjjh4JBSW3WyWgNo/ikC1lrVxzl4iPUGptxT36Cr7Zk2Bsg0XqwbOvK
-5d+NTDREkSnUbie4GeutujmX3Dsx88UiV6UY/4lHJa6I5leHUNOHahRbpbWeOfs/
-WkBKOclmOV2xlTVuPw==
+DgQWBBQR5QIzmacmw78ZI1C4MXw7Q0wJ1jA9BgNVHREENjA0ggtleGFtcGxlLmNv
+bYINKi5leGFtcGxlLmNvbYcEfwAAAYcQAAAAAAAAAAAAAAAAAAAAATANBgkqhkiG
+9w0BAQsFAAOCAQEACrRNgiioUDzxQftd0fwOa6iRRcPampZRDtuaF68yNHoNWbOu
+LUwc05eOWxRq3iABGSk2xg+FXM3DDeW4HhAhCFptq7jbVZ+4Jj6HeJG9mYRatAxR
+Y/dEpa0D0EHhDxxVg6UzKOXB355n0IetGE/aWvyTV9SiDs6QsaC57Q9qq1/mitx5
+2GFBoapol9L5FxCc77bztzK8CpLujkBi25Vk6GAFbl27opLfpyxkM+rX/T6MXCPO
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+rF7r4gUnKeC7mYIH1zypY7laskopiLFAfe96Kg==
 -----END CERTIFICATE-----`)
 
 // LocalhostKey is the private key for LocalhostCert.
 var LocalhostKey = []byte(testingKey(`-----BEGIN RSA TESTING KEY-----
-MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKYwggSiAgEAAoIBAQDoZtrm0dXV0Aqi
-4Bpc7f95sNRTiu/AJSD8I1onY9PnEsPg3VVxvytsVJbYdcqr4w99V3AgpH/UNzMS
-gAZ/8lZBNbsSDOVesJ3euVqMRfYPvd9pYl6QPRRpSDPm+2tNdn3QFAvta9EgJ3sW
-URnoU85w+W6aLI2bNSq3AaE771p3VbkGolpEjo9h+i42TBHo1rhPNKPkGupR8/QX
-AOLMpInRdeaHyDwb2a3DE5I3dG7VAVzrVfJ6W6Q84YoFX+rpEE2SVM17SAjy6xQy
-VjKgLvK2mk0xbtfa+h0B6VK7bmODHZqeP18NVm6HsBcXn7iclLgAC3SfWU1jucZK
-x1lqzw9tAgMBAAECggEABWzxS1Y2wckblnXY57Z+sl6YdmLV+gxj2r8Qib7g4ZIk
-lIlWR1OJNfw7kU4eryib4fc6nOh6O4AWZyYqAK6tqNQSS/eVG0LQTLTTEldHyVJL
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-xiUZS4SoaJq6ZvcBYS62Yr1t8n09iG47YL8ibgtmH3L+svaotvpVxVK+d7BLevA/
-ZboOWVe3icTy64BT3OQhmg==
+MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDFyXr1E4l3GM34
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 -----END RSA TESTING KEY-----`))
 
 func testingKey(s string) string { return strings.ReplaceAll(s, "TESTING KEY", "PRIVATE KEY") }