DevTools: implement Page.setBypassCSP method

This patch implements a new method Page.setBypassCSP
that allows disabling content security policy for the given page.

R=dgozman, pfeldman

Change-Id: I29d55aa593c50a24c12fd8b98a8315387dff30b0
Reviewed-on: https://chromium-review.googlesource.com/996905
Commit-Queue: Andrey Lushnikov <lushnikov@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548598}

third_party/WebKit/LayoutTests/http/tests/inspector-protocol/page/page-set-bypass-csp-expected.txt

+Tests that Page.setBypassCSP works for main frame.
+Verify CSP works when set with <meta>
+  CSP bypassed: false
+Verify CSP works when set with header
+  CSP bypassed: false
+
+>> ENABLING CSP BYPASS <<
+
+Verify CSP is bypassed when set with <meta>
+  CSP bypassed: true
+Verify CSP is bypassed when set with header
+  CSP bypassed: true
+Check bypass after cross-origin navigation
+  CSP bypassed: true
+

third_party/WebKit/LayoutTests/http/tests/inspector-protocol/page/page-set-bypass-csp.js

+(async function(testRunner) {
+  const {page, session, dp} = await testRunner.startBlank(
+      `Tests that Page.setBypassCSP works for main frame.`);
+
+  await dp.Page.enable();
+  await dp.Runtime.enable();
+
+  testRunner.log('Verify CSP works when set with <meta>');
+  await page.navigate('./resources/csp.html');
+  await dumpCSPEnabled();
+
+  testRunner.log('Verify CSP works when set with header');
+  await page.navigate('./resources/csp.php');
+  await dumpCSPEnabled();
+
+  testRunner.log('\n>> ENABLING CSP BYPASS <<\n');
+  await dp.Page.setBypassCSP({ enabled: true });
+
+  testRunner.log('Verify CSP is bypassed when set with <meta>');
+  await page.navigate('./resources/csp.html');
+  await dumpCSPEnabled();
+
+  testRunner.log('Verify CSP is bypassed when set with header');
+  await page.navigate('./resources/csp.php');
+  await dumpCSPEnabled();
+
+  testRunner.log('Check bypass after cross-origin navigation');
+  await page.navigate('http://127.0.0.1:8000/inspector-protocol/page/resources/csp.php');
+  await page.navigate('https://127.0.0.1:8443/inspector-protocol/page/resources/csp.php');
+  await dumpCSPEnabled();
+
+  testRunner.completeTest();
+
+  async function dumpCSPEnabled() {
+    const message = await dp.Runtime.evaluate({ expression: 'window.__injected' });
+    testRunner.log('  CSP bypassed: ' + (message.result.result.value === 42));
+  }
+})

third_party/WebKit/LayoutTests/http/tests/inspector-protocol/page/resources/csp.html

+<meta http-equiv="Content-Security-Policy" content="default-src 'self'">
+<script type="text/javascript">window.__injected = 42;</script>

third_party/WebKit/LayoutTests/http/tests/inspector-protocol/page/resources/csp.php

+<?php
+ob_start();
+header("Content-Security-Policy: default-src 'self'");
+echo "<script type='text/javascript'>window.__injected = 42;</script>";

third_party/WebKit/LayoutTests/http/tests/inspector-protocol/resources/inspector-protocol-test.js

@@ -77,6 +77,8 @@ var TestRunner = class {
   }
 
   url(relative) {
+    if (relative.startsWith('http://') || relative.startsWith('https://'))
+      return relative;
     return this._baseURL + relative;
   }
 

third_party/WebKit/Source/core/frame/Settings.h

@@ -70,6 +70,9 @@ class CORE_EXPORT Settings {
   void SetTextAutosizingEnabled(bool);
   bool TextAutosizingEnabled() const { return text_autosizing_enabled_; }
 
+  void SetBypassCSP(bool enabled) { bypass_csp_ = enabled; }
+  bool BypassCSP() const { return bypass_csp_; }
+
   // Only set by Layout Tests, and only used if textAutosizingEnabled() returns
   // true.
   void SetTextAutosizingWindowSizeOverride(const IntSize&);
@@ -105,6 +108,7 @@ class CORE_EXPORT Settings {
   // use counter via the shadow page. Once blink side use counter is removed,
   // this flag is no longer needed (crbug.com/811948).
   bool is_shadow_page_;
+  bool bypass_csp_ = false;
 
   SETTINGS_MEMBER_VARIABLES
 

third_party/WebKit/Source/core/inspector/InspectorPageAgent.cpp

@@ -87,6 +87,7 @@ static const char kPageAgentScriptsToEvaluateOnLoad[] =
     "pageAgentScriptsToEvaluateOnLoad";
 static const char kScreencastEnabled[] = "screencastEnabled";
 static const char kLifecycleEventsEnabled[] = "lifecycleEventsEnabled";
+static const char kBypassCSPEnabled[] = "bypassCSPEnabled";
 }
 
 namespace {
@@ -458,6 +459,8 @@ InspectorPageAgent::InspectorPageAgent(
 void InspectorPageAgent::Restore() {
   if (state_->booleanProperty(PageAgentState::kPageAgentEnabled, false))
     enable();
+  if (state_->booleanProperty(PageAgentState::kBypassCSPEnabled, false))
+    setBypassCSP(true);
 }
 
 Response InspectorPageAgent::enable() {
@@ -751,6 +754,13 @@ void InspectorPageAgent::searchInResource(
                 WTF::Passed(std::move(callback))));
 }
 
+Response InspectorPageAgent::setBypassCSP(bool enabled) {
+  LocalFrame* frame = inspected_frames_->Root();
+  frame->GetSettings()->SetBypassCSP(enabled);
+  state_->setBoolean(PageAgentState::kBypassCSPEnabled, enabled);
+  return Response::OK();
+}
+
 Response InspectorPageAgent::setDocumentContent(const String& frame_id,
                                                 const String& html) {
   LocalFrame* frame =

third_party/WebKit/Source/core/inspector/InspectorPageAgent.h

@@ -135,6 +135,8 @@ class CORE_EXPORT InspectorPageAgent final
                         std::unique_ptr<SearchInResourceCallback>) override;
   protocol::Response setDocumentContent(const String& frame_id,
                                         const String& html) override;
+  protocol::Response setBypassCSP(bool enabled) override;
+
   protocol::Response startScreencast(Maybe<String> format,
                                      Maybe<int> quality,
                                      Maybe<int> max_width,

third_party/WebKit/Source/core/inspector/browser_protocol.json

@@ -10380,6 +10380,18 @@
                         }
                     ]
                 },
+                {
+                    "name": "setBypassCSP",
+                    "description": "Enable page Content Security Policy by-passing.",
+                    "experimental": true,
+                    "parameters": [
+                        {
+                            "name": "enabled",
+                            "description": "Whether to bypass page CSP.",
+                            "type": "boolean"
+                        }
+                    ]
+                },
                 {
                     "name": "setDeviceMetricsOverride",
                     "description": "Overrides the values of device screen dimensions (window.screen.width, window.screen.height,\nwindow.innerWidth, window.innerHeight, and \"device-width\"/\"device-height\"-related CSS media\nquery results).",

third_party/WebKit/Source/core/inspector/browser_protocol.pdl

@@ -4751,6 +4751,12 @@ domain Page
       # Whether to block ads.
       boolean enabled
 
+  # Enable page Content Security Policy by-passing.
+  experimental command setBypassCSP
+    parameters
+      # Whether to bypass page CSP.
+      boolean enabled
+
   # Overrides the values of device screen dimensions (window.screen.width, window.screen.height,
   # window.innerWidth, window.innerHeight, and "device-width"/"device-height"-related CSS media
   # query results).

third_party/WebKit/Source/core/loader/DocumentLoader.cpp

@@ -601,14 +601,17 @@ void DocumentLoader::ResponseReceived(
 
   content_security_policy_ = ContentSecurityPolicy::Create();
   content_security_policy_->SetOverrideURLForSelf(response.Url());
+  if (!frame_->GetSettings()->BypassCSP()) {
     content_security_policy_->DidReceiveHeaders(
         ContentSecurityPolicyResponseHeaders(response));
+  }
   if (!content_security_policy_->AllowAncestors(frame_, response.Url())) {
     CancelLoadAfterCSPDenied(response);
     return;
   }
 
-  if (RuntimeEnabledFeatures::EmbedderCSPEnforcementEnabled() &&
+  if (!frame_->GetSettings()->BypassCSP() &&
+      RuntimeEnabledFeatures::EmbedderCSPEnforcementEnabled() &&
       !GetFrameLoader().RequiredCSP().IsEmpty()) {
     const SecurityOrigin* parent_security_origin =
         frame_->Tree().Parent()->GetSecurityContext()->GetSecurityOrigin();

third_party/WebKit/Source/core/loader/HttpEquiv.cpp

@@ -9,6 +9,7 @@
 #include "core/dom/ScriptableDocumentParser.h"
 #include "core/frame/Deprecation.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/Settings.h"
 #include "core/frame/UseCounter.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/inspector/ConsoleMessage.h"
@@ -67,6 +68,8 @@ void HttpEquiv::ProcessHttpEquivContentSecurityPolicy(
     const AtomicString& content) {
   if (document.ImportLoader())
     return;
+  if (document.GetSettings() && document.GetSettings()->BypassCSP())
+    return;
   if (EqualIgnoringASCIICase(equiv, "content-security-policy")) {
     document.GetContentSecurityPolicy()->DidReceiveHeader(
         content, kContentSecurityPolicyHeaderTypeEnforce,