Network service: SafeBrowsing check for frame-resources from browser.

chrome/browser/safe_browsing/safe_browsing_url_checker_impl.cc

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/safe_browsing/safe_browsing_url_checker_impl.h"
+
+#include "chrome/browser/prerender/prerender_contents.h"
+#include "chrome/browser/safe_browsing/ui_manager.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/web_contents.h"
+#include "net/base/load_flags.h"
+
+namespace safe_browsing {
+namespace {
+
+// TODO(yzshen): Share such value with safe_browsing::BaseResourceThrottle.
+// Maximum time in milliseconds to wait for the SafeBrowsing service reputation
+// check. After this amount of time the outstanding check will be aborted, and
+// the resource will be treated as if it were safe.
+const int kCheckUrlTimeoutMs = 5000;
+
+}  // namespace
+
+SafeBrowsingUrlCheckerImpl::SafeBrowsingUrlCheckerImpl(
+    int load_flags,
+    content::ResourceType resource_type,
+    scoped_refptr<SafeBrowsingDatabaseManager> database_manager,
+    scoped_refptr<SafeBrowsingUIManager> ui_manager,
+    const base::Callback<content::WebContents*()>& web_contents_getter)
+    : load_flags_(load_flags),
+      resource_type_(resource_type),
+      web_contents_getter_(web_contents_getter),
+      database_manager_(std::move(database_manager)),
+      ui_manager_(std::move(ui_manager)),
+      weak_factory_(this) {}
+
+SafeBrowsingUrlCheckerImpl::~SafeBrowsingUrlCheckerImpl() {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+
+  if (state_ == STATE_CHECKING_URL)
+    database_manager_->CancelCheck(this);
+
+  for (size_t i = next_index_; i < callbacks_.size(); ++i)
+    std::move(callbacks_[i]).Run(false);
+}
+
+void SafeBrowsingUrlCheckerImpl::CheckUrl(const GURL& url,
+                                          CheckUrlCallback callback) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+
+  DVLOG(1) << "SafeBrowsingUrlCheckerImpl checks URL: " << url;
+  urls_.push_back(url);
+  callbacks_.push_back(std::move(callback));
+
+  ProcessUrls();
+}
+
+void SafeBrowsingUrlCheckerImpl::OnCheckBrowseUrlResult(
+    const GURL& url,
+    SBThreatType threat_type,
+    const ThreatMetadata& metadata) {
+  DCHECK_EQ(STATE_CHECKING_URL, state_);
+  DCHECK_LT(next_index_, urls_.size());
+  DCHECK_EQ(urls_[next_index_], url);
+
+  timer_.Stop();
+  if (threat_type == SB_THREAT_TYPE_SAFE) {
+    state_ = STATE_NONE;
+    std::move(callbacks_[next_index_]).Run(true);
+    next_index_++;
+    ProcessUrls();
+    return;
+  }
+
+  if (load_flags_ & net::LOAD_PREFETCH) {
+    // TODO(yzshen): Destroy prerender contents if necessary.
+
+    BlockAndProcessUrls();
+    return;
+  }
+
+  security_interstitials::UnsafeResource resource;
+  resource.url = url;
+  resource.original_url = urls_[0];
+  if (urls_.size() > 1)
+    resource.redirect_urls = std::vector<GURL>(urls_.begin() + 1, urls_.end());
+  resource.is_subresource = resource_type_ != content::RESOURCE_TYPE_MAIN_FRAME;
+  resource.is_subframe = resource_type_ == content::RESOURCE_TYPE_SUB_FRAME;
+  resource.threat_type = threat_type;
+  resource.threat_metadata = metadata;
+  resource.callback =
+      base::Bind(&SafeBrowsingUrlCheckerImpl::OnBlockingPageComplete,
+                 weak_factory_.GetWeakPtr());
+  resource.callback_thread = content::BrowserThread::GetTaskRunnerForThread(
+      content::BrowserThread::IO);
+  resource.web_contents_getter = web_contents_getter_;
+  resource.threat_source = database_manager_->GetThreatSource();
+
+  state_ = STATE_DISPLAYING_BLOCKING_PAGE;
+
+  content::BrowserThread::PostTask(
+      content::BrowserThread::UI, FROM_HERE,
+      base::Bind(&SafeBrowsingUrlCheckerImpl::StartDisplayingBlockingPage,
+                 weak_factory_.GetWeakPtr(), ui_manager_, resource));
+}
+
+// static
+void SafeBrowsingUrlCheckerImpl::StartDisplayingBlockingPage(
+    const base::WeakPtr<SafeBrowsingUrlCheckerImpl>& checker,
+    scoped_refptr<BaseUIManager> ui_manager,
+    const security_interstitials::UnsafeResource& resource) {
+  content::WebContents* web_contents = resource.web_contents_getter.Run();
+  if (web_contents) {
+    prerender::PrerenderContents* prerender_contents =
+        prerender::PrerenderContents::FromWebContents(web_contents);
+    if (prerender_contents) {
+      prerender_contents->Destroy(prerender::FINAL_STATUS_SAFE_BROWSING);
+    } else {
+      ui_manager->DisplayBlockingPage(resource);
+      return;
+    }
+  }
+
+  // Tab is gone or it's being prerendered.
+  content::BrowserThread::PostTask(
+      content::BrowserThread::IO, FROM_HERE,
+      base::BindOnce(&SafeBrowsingUrlCheckerImpl::BlockAndProcessUrls,
+                     checker));
+}
+
+void SafeBrowsingUrlCheckerImpl::OnCheckUrlTimeout() {
+  database_manager_->CancelCheck(this);
+
+  OnCheckBrowseUrlResult(urls_[next_index_], safe_browsing::SB_THREAT_TYPE_SAFE,
+                         ThreatMetadata());
+}
+
+void SafeBrowsingUrlCheckerImpl::ProcessUrls() {
+  DCHECK_NE(STATE_BLOCKED, state_);
+
+  if (state_ == STATE_CHECKING_URL ||
+      state_ == STATE_DISPLAYING_BLOCKING_PAGE) {
+    return;
+  }
+
+  while (next_index_ < urls_.size()) {
+    DCHECK_EQ(STATE_NONE, state_);
+    // TODO(yzshen): Consider moving CanCheckResourceType() to the renderer
+    // side. That would save some IPCs. It requires a method on the
+    // SafeBrowsing mojo interface to query all supported resource types.
+    if (!database_manager_->CanCheckResourceType(resource_type_) ||
+        database_manager_->CheckBrowseUrl(urls_[next_index_], this)) {
+      std::move(callbacks_[next_index_]).Run(true);
+      next_index_++;
+      continue;
+    }
+
+    state_ = STATE_CHECKING_URL;
+    // Start a timer to abort the check if it takes too long.
+    timer_.Start(FROM_HERE,
+                 base::TimeDelta::FromMilliseconds(kCheckUrlTimeoutMs), this,
+                 &SafeBrowsingUrlCheckerImpl::OnCheckUrlTimeout);
+
+    break;
+  }
+}
+
+void SafeBrowsingUrlCheckerImpl::BlockAndProcessUrls() {
+  DVLOG(1) << "SafeBrowsingUrlCheckerImpl blocks URL: " << urls_[next_index_];
+  state_ = STATE_BLOCKED;
+
+  // If user decided to not proceed through a warning, mark all the remaining
+  // redirects as "bad".
+  for (; next_index_ < callbacks_.size(); ++next_index_)
+    std::move(callbacks_[next_index_]).Run(false);
+}
+
+void SafeBrowsingUrlCheckerImpl::OnBlockingPageComplete(bool proceed) {
+  DCHECK_EQ(STATE_DISPLAYING_BLOCKING_PAGE, state_);
+
+  if (proceed) {
+    state_ = STATE_NONE;
+    std::move(callbacks_[next_index_]).Run(true);
+    next_index_++;
+    ProcessUrls();
+  } else {
+    BlockAndProcessUrls();
+  }
+}
+
+}  // namespace safe_browsing