fix: crash loading non-standard schemes in iframes

patches/chromium/.patches

@@ -117,3 +117,4 @@ add_maximized_parameter_to_linuxui_getwindowframeprovider.patch
 revert_spellcheck_fully_launch_spell_check_delayed_initialization.patch
 add_electron_deps_to_license_credits_file.patch
 feat_add_set_can_resize_mutator.patch
+fix_crash_loading_non-standard_schemes_in_iframes.patch

patches/chromium/fix_crash_loading_non-standard_schemes_in_iframes.patch

@@ -0,0 +1,78 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Shelley Vohr <shelley.vohr@gmail.com>
+Date: Mon, 29 Aug 2022 11:44:57 +0200
+Subject: fix: crash loading non-standard schemes in iframes
+
+This fixes a crash that occurs when loading non-standard schemes from
+iframes or webviews. This was happening because
+ChildProcessSecurityPolicyImpl::CanAccessDataForOrigin contains explicit
+exceptions to allow built-in non-standard schemes, but does not check
+for non-standard schemes registered by the embedder.
+
+Upstream, https://bugs.chromium.org/p/chromium/issues/detail?id=1081397
+contains several paths forward - here I chose to swap out the
+CHECK in navigation_request.cc from policy->CanAccessDataForOrigin to
+policy->CanCommitOriginAndUrl.
+
+This, or a version of it, will be upstreamed.
+
+diff --git a/content/browser/renderer_host/navigation_request.cc b/content/browser/renderer_host/navigation_request.cc
+index b1120c9270a255e4b6070c0d2b5f49e6f99d935d..407888cb17d3e609ad7aaa2ed1c079642df60bca 100644
+--- a/content/browser/renderer_host/navigation_request.cc
++++ b/content/browser/renderer_host/navigation_request.cc
+@@ -6517,10 +6517,11 @@ std::pair<url::Origin, std::string> NavigationRequest::
+   if (IsForMhtmlSubframe())
+     return origin_with_debug_info;
+
+-  int process_id = GetRenderFrameHost()->GetProcess()->GetID();
+-  auto* policy = ChildProcessSecurityPolicyImpl::GetInstance();
+-  CHECK(
+-      policy->CanAccessDataForOrigin(process_id, origin_with_debug_info.first));
++  CanCommitStatus can_commit = GetRenderFrameHost()->CanCommitOriginAndUrl(
++    origin_with_debug_info.first, GetURL(), IsSameDocument(), IsPdf(),
++    GetUrlInfo().is_sandboxed);
++  CHECK_EQ(CanCommitStatus::CAN_COMMIT_ORIGIN_AND_URL, can_commit);
++
+   return origin_with_debug_info;
+ }
+
+diff --git a/content/browser/renderer_host/render_frame_host_impl.h b/content/browser/renderer_host/render_frame_host_impl.h
+index b1259618ff4dc1848cf007d853e6f3e70b08829f..3d4e6c4c7e0348c52c3f0ccd0f6c19e0e1ec15a5 100644
+--- a/content/browser/renderer_host/render_frame_host_impl.h
++++ b/content/browser/renderer_host/render_frame_host_impl.h
+@@ -2550,6 +2550,17 @@ class CONTENT_EXPORT RenderFrameHostImpl
+     HandleAXEvents(tree_id, std::move(updates_and_events), reset_token);
+   }
+
++  // Returns whether the given origin and URL is allowed to commit in the
++  // current RenderFrameHost. The |url| is used to ensure it matches the origin
++  // in cases where it is applicable. This is a more conservative check than
++  // RenderProcessHost::FilterURL, since it will be used to kill processes that
++  // commit unauthorized origins.
++  CanCommitStatus CanCommitOriginAndUrl(const url::Origin& origin,
++                                        const GURL& url,
++                                        bool is_same_document_navigation,
++                                        bool is_pdf,
++                                        bool is_sandboxed);
++
+  protected:
+   friend class RenderFrameHostFactory;
+
+@@ -2879,17 +2890,6 @@ class CONTENT_EXPORT RenderFrameHostImpl
+   // relevant.
+   void ResetWaitingState();
+
+-  // Returns whether the given origin and URL is allowed to commit in the
+-  // current RenderFrameHost. The |url| is used to ensure it matches the origin
+-  // in cases where it is applicable. This is a more conservative check than
+-  // RenderProcessHost::FilterURL, since it will be used to kill processes that
+-  // commit unauthorized origins.
+-  CanCommitStatus CanCommitOriginAndUrl(const url::Origin& origin,
+-                                        const GURL& url,
+-                                        bool is_same_document_navigation,
+-                                        bool is_pdf,
+-                                        bool is_sandboxed);
+-
+   // Returns whether a subframe navigation request should be allowed to commit
+   // to the current RenderFrameHost.
+   bool CanSubframeCommitOriginAndUrl(NavigationRequest* navigation_request);

spec/api-protocol-spec.ts

@@ -9,7 +9,7 @@ import * as fs from 'fs';
 import * as qs from 'querystring';
 import * as stream from 'stream';
 import { EventEmitter } from 'events';
-import { closeWindow } from './window-helpers';
+import { closeAllWindows, closeWindow } from './window-helpers';
 import { emittedOnce } from './events-helpers';
 import { WebmGenerator } from './video-helpers';
 import { delay } from './spec-helpers';
@@ -216,6 +216,8 @@ describe('protocol module', () => {
     const normalPath = path.join(fixturesPath, 'pages', 'a.html');
     const normalContent = fs.readFileSync(normalPath);
 
+    afterEach(closeAllWindows);
+
     it('sends file path as response', async () => {
       registerFileProtocol(protocolName, (request, callback) => callback(filePath));
       const r = await ajax(protocolName + '://fake-host');
@@ -239,6 +241,25 @@ describe('protocol module', () => {
       expect(r.headers).to.have.property('x-great-header', 'sogreat');
     });
 
+    it('can load iframes with custom protocols', (done) => {
+      registerFileProtocol('custom', (request, callback) => {
+        const filename = request.url.substring(9);
+        const p = path.join(__dirname, 'fixtures', 'pages', filename);
+        callback({ path: p });
+      });
+
+      const w = new BrowserWindow({
+        show: false,
+        webPreferences: {
+          nodeIntegration: true,
+          contextIsolation: false
+        }
+      });
+
+      w.loadFile(path.join(__dirname, 'fixtures', 'pages', 'iframe-protocol.html'));
+      ipcMain.once('loaded-iframe-custom-protocol', () => done());
+    });
+
     it.skip('throws an error when custom headers are invalid', (done) => {
       registerFileProtocol(protocolName, (request, callback) => {
         expect(() => callback({

spec/fixtures/pages/iframe-protocol.html

@@ -0,0 +1,11 @@
+<body>
+  <iframe src="custom://base-page.html"></iframe>
+  <script>
+    const { ipcRenderer } = require('electron');
+    const iframe = document.querySelector('iframe');
+
+    iframe.addEventListener('load', () => {
+      ipcRenderer.send('loaded-iframe-custom-protocol');
+    });
+  </script>
+</body>