Bug 1691658 - block http redirects to data: protocol, r=necko-reviewers,ckerschb,valentin

This also adds a network.allow_redirect_to_data pref in case we need to turn
this back on for compat reasons.

Differential Revision: https://phabricator.services.mozilla.com/D173988

dom/locales/en-US/chrome/security/security.properties

@@ -88,7 +88,7 @@ BlockModuleWithWrongMimeType=Loading module from “%1$S” was blocked because
 
 # LOCALIZATION NOTE: Do not translate "data: URI".
 BlockTopLevelDataURINavigation=Navigation to toplevel data: URI not allowed (Blocked loading of: “%1$S”)
-BlockSubresourceRedirectToData=Redirecting to insecure data: URI not allowed (Blocked loading of: “%1$S”)
+BlockRedirectToDataURI=Redirecting to data: URI not allowed (Blocked loading of: “%1$S”)
 
 # LOCALIZATION NOTE: Do not translate "file: URI". “%1$S” is the whole URI of the loaded file. “%2$S” is the MIME type e.g. "text/plain".
 BlockFileScriptWithWrongMimeType=Loading script from file: URI (“%1$S”) was blocked because its MIME type (“%2$S”) is not a valid JavaScript MIME type.

dom/security/nsContentSecurityManager.cpp

@@ -131,10 +131,18 @@ bool nsContentSecurityManager::AllowTopLevelNavigationToDataURI(
     return true;
   }
 
+  ReportBlockedDataURI(uri, loadInfo);
+
+  return false;
+}
+
+void nsContentSecurityManager::ReportBlockedDataURI(nsIURI* aURI,
+                                                    nsILoadInfo* aLoadInfo,
+                                                    bool aIsRedirect) {
   // We're going to block the request, construct the localized error message to
   // report to the console.
   nsAutoCString dataSpec;
-  uri->GetSpec(dataSpec);
+  aURI->GetSpec(dataSpec);
   if (dataSpec.Length() > 50) {
     dataSpec.Truncate(50);
     dataSpec.AppendLiteral("...");
@@ -142,18 +150,20 @@ bool nsContentSecurityManager::AllowTopLevelNavigationToDataURI(
   AutoTArray<nsString, 1> params;
   CopyUTF8toUTF16(NS_UnescapeURL(dataSpec), *params.AppendElement());
   nsAutoString errorText;
-  rv = nsContentUtils::FormatLocalizedString(
-      nsContentUtils::eSECURITY_PROPERTIES, "BlockTopLevelDataURINavigation",
-      params, errorText);
-  NS_ENSURE_SUCCESS(rv, false);
+  const char* stringID =
+      aIsRedirect ? "BlockRedirectToDataURI" : "BlockTopLevelDataURINavigation";
+  nsresult rv = nsContentUtils::FormatLocalizedString(
+      nsContentUtils::eSECURITY_PROPERTIES, stringID, params, errorText);
+  if (NS_FAILED(rv)) {
+    return;
+  }
 
   // Report the localized error message to the console for the loading
   // BrowsingContext's current inner window.
-  RefPtr<BrowsingContext> target = loadInfo->GetBrowsingContext();
+  RefPtr<BrowsingContext> target = aLoadInfo->GetBrowsingContext();
   nsContentUtils::ReportToConsoleByWindowID(
       errorText, nsIScriptError::warningFlag, "DATA_URI_BLOCKED"_ns,
       target ? target->GetCurrentInnerWindowId() : 0);
-  return false;
 }
 
 /* static */
@@ -181,23 +191,8 @@ bool nsContentSecurityManager::AllowInsecureRedirectToDataURI(
     return true;
   }
 
-  nsAutoCString dataSpec;
-  newURI->GetSpec(dataSpec);
-  if (dataSpec.Length() > 50) {
-    dataSpec.Truncate(50);
-    dataSpec.AppendLiteral("...");
-  }
-  nsCOMPtr<Document> doc;
-  nsINode* node = loadInfo->LoadingNode();
-  if (node) {
-    doc = node->OwnerDoc();
-  }
-  AutoTArray<nsString, 1> params;
-  CopyUTF8toUTF16(NS_UnescapeURL(dataSpec), *params.AppendElement());
-  nsContentUtils::ReportToConsole(nsIScriptError::warningFlag,
-                                  "DATA_URI_BLOCKED"_ns, doc,
-                                  nsContentUtils::eSECURITY_PROPERTIES,
-                                  "BlockSubresourceRedirectToData", params);
+  ReportBlockedDataURI(newURI, loadInfo, true);
+
   return false;
 }
 

dom/security/nsContentSecurityManager.h

@@ -39,6 +39,8 @@ class nsContentSecurityManager : public nsIContentSecurityManager,
       nsIChannel* aChannel, nsCOMPtr<nsIStreamListener>& aInAndOutListener);
 
   static bool AllowTopLevelNavigationToDataURI(nsIChannel* aChannel);
+  static void ReportBlockedDataURI(nsIURI* aURI, nsILoadInfo* aLoadInfo,
+                                   bool aIsRedirect = false);
   static bool AllowInsecureRedirectToDataURI(nsIChannel* aNewChannel);
   static void MeasureUnexpectedPrivilegedLoads(nsILoadInfo* aLoadInfo,
                                                nsIURI* aFinalURI,

dom/security/test/cors/test_CrossSiteXHR_origin.html

@@ -47,11 +47,25 @@ var origins =
    //['https://example.com:443'],
    //['https://sub1.test1.example.com:443'],
 
+
+function initTest() {
+  // Allow all cookies, then do the actual test initialization
+  SpecialPowers.pushPrefEnv({
+    "set": [
+      // Some of this test relies on redirecting to data: URLs from http.
+      ["network.allow_redirect_to_data", true],
+      ]
+  }).then(initTestCallback);
+}
+
+function initTestCallback() {
   window.addEventListener("message", function(e) {
     gen.next(e.data);
   });
 
   gen = runTest();
+  gen.next();
+}
 
 function* runTest() {
   var loader = document.getElementById('loader');
@@ -158,9 +172,8 @@ function* runTest() {
   SimpleTest.finish();
 }
 
-addLoadEvent(function() {
-  gen.next();
-});
+addLoadEvent(initTest);
+
 </script>
 </pre>
 </body>

dom/security/test/general/test_block_toplevel_data_navigation.html

@@ -24,7 +24,8 @@ async function expectBlockedToplevelData() {
             return;
           }
 
-          if (ChromeUtils.getXPCOMErrorName(status) != "NS_ERROR_DOM_BAD_URI") {
+          if (!["NS_ERROR_DOM_BAD_URI", "NS_ERROR_CORRUPTED_CONTENT"].includes(ChromeUtils.getXPCOMErrorName(status))) {
+            info(ChromeUtils.getXPCOMErrorName(status));
             isnot(request.URI.scheme, "data");
             return;
           }

modules/libpref/init/StaticPrefList.yaml

@@ -12556,6 +12556,11 @@
   value: 1
   mirror: always
 
+- name: network.allow_redirect_to_data
+  type: RelaxedAtomicBool
+  value: false
+  mirror: always
+
 - name: network.allow_raw_sockets_in_content_processes
   type: bool
   value: false

netwerk/protocol/http/nsHttpChannel.cpp

@@ -5246,6 +5246,15 @@ nsresult nsHttpChannel::AsyncProcessRedirection(uint32_t redirectType) {
     return NS_ERROR_CORRUPTED_CONTENT;
   }
 
+  if (!StaticPrefs::network_allow_redirect_to_data() &&
+      !mLoadInfo->GetAllowInsecureRedirectToDataURI() &&
+      mRedirectURI->SchemeIs("data")) {
+    LOG(("Invalid data URI for redirect!"));
+    nsContentSecurityManager::ReportBlockedDataURI(mRedirectURI, mLoadInfo,
+                                                   true);
+    return NS_ERROR_DOM_BAD_URI;
+  }
+
   // Perform the URL query string stripping for redirects. We will only strip
   // the query string if it is redirecting to a third-party URI in the top
   // level.

netwerk/test/unit/xpcshell.ini

@@ -33,8 +33,11 @@ support-files =
 # interception, we need to explicitly enable the pref.
 # Consider enabling it in StaticPrefList.yaml
 # https://bugzilla.mozilla.org/show_bug.cgi?id=1816325
+# Several tests rely on redirecting to data: URIs, which was allowed for a long
+# time but now forbidden. So we enable it just for these tests.
 prefs =
   dom.serviceWorkers.enabled=true
+  network.allow_redirect_to_data=true
 
 [test_trr_nat64.js]
 run-sequentially = node server exceptions dont replay well

netwerk/test/unit_ipc/xpcshell.ini

@@ -1,6 +1,10 @@
 [DEFAULT]
 head = head_channels_clone.js  head_trr_clone.js head_http3_clone.js ../unit/head_servers.js
 skip-if = socketprocess_networking
+# Several tests rely on redirecting to data: URIs, which was allowed for a long
+# time but now forbidden. So we enable it just for these tests.
+prefs =
+  network.allow_redirect_to_data=true
 support-files =
   child_channel_id.js
   !/netwerk/test/unit/test_XHR_redirects.js

testing/web-platform/meta/fetch/api/redirect/redirect-to-dataurl.any.js.ini

@@ -1,41 +0,0 @@
-[redirect-to-dataurl.any.worker.html]
-  expected:
-    if (os == "android") and fission: [OK, TIMEOUT]
-  [Testing data URL loading after same-origin redirection (no-cors mode)]
-    expected: FAIL
-
-  [Testing data URL loading after same-origin redirection (same-origin mode)]
-    expected: FAIL
-
-  [Testing data URL loading after cross-origin redirection (no-cors mode)]
-    expected: FAIL
-
-
-[redirect-to-dataurl.any.html]
-  expected:
-    if (os == "android") and fission: [OK, TIMEOUT]
-  [Testing data URL loading after same-origin redirection (no-cors mode)]
-    expected: FAIL
-
-  [Testing data URL loading after same-origin redirection (same-origin mode)]
-    expected: FAIL
-
-  [Testing data URL loading after cross-origin redirection (no-cors mode)]
-    expected: FAIL
-
-
-[redirect-to-dataurl.any.serviceworker.html]
-  expected:
-    if (os == "android") and fission: [TIMEOUT, OK]
-
-[redirect-to-dataurl.any.sharedworker.html]
-  expected:
-    if (os == "android") and fission: [OK, TIMEOUT]
-  [Testing data URL loading after cross-origin redirection (no-cors mode)]
-    expected: FAIL
-
-  [Testing data URL loading after same-origin redirection (same-origin mode)]
-    expected: FAIL
-
-  [Testing data URL loading after same-origin redirection (no-cors mode)]
-    expected: FAIL

testing/web-platform/meta/fetch/redirects/data.window.js.ini

@@ -1,4 +0,0 @@
-[data.window.html]
-  [<img> fetch that redirects to data: URL]
-    expected: FAIL
-

testing/web-platform/meta/html/browsers/browsing-the-web/navigating-across-documents/redirect-to-data.html.ini

@@ -1,6 +1,16 @@
 [redirect-to-data.html]
+  # This test relies on iframe.onload, which doesn't work:
+  # https://bugzilla.mozilla.org/show_bug.cgi?id=1194350
+  expected: TIMEOUT
+
   [Loading an iframe with src=redirecting URL]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Navigating an iframe to a redirecting URL]
-    expected: FAIL
+    expected: NOTRUN
+
+  [Loading a popup directly to the redirecting URL]
+    expected: NOTRUN
+
+  [Loading a popup that eventually goes to the redirecting URL]
+    expected: NOTRUN