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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/renderer_host/blocked_scheme_navigation_throttle.h"
#include "base/feature_list.h"
#include "base/strings/stringprintf.h"
#include "build/build_config.h"
#include "content/browser/renderer_host/frame_tree.h"
#include "content/browser/renderer_host/frame_tree_node.h"
#include "content/browser/renderer_host/navigation_request.h"
#include "content/common/features.h"
#include "content/common/navigation_params_utils.h"
#include "content/public/browser/navigation_handle.h"
#include "content/public/browser/render_frame_host.h"
#include "storage/browser/file_system/external_mount_points.h"
#include "storage/browser/file_system/file_system_url.h"
#include "storage/common/file_system/file_system_util.h"
#include "third_party/blink/public/mojom/devtools/console_message.mojom.h"
#include "url/url_constants.h"
namespace content {
namespace {
const char kConsoleError[] = "Not allowed to navigate top frame to %s URL: %s";
const char kAnyFrameConsoleError[] = "Not allowed to navigate to %s URL: %s";
bool IsExternalMountedFile(const GURL& url) {
storage::FileSystemURL file_system_url =
storage::ExternalMountPoints::GetSystemInstance()->CrackURL(
url, blink::StorageKey::CreateFirstParty(url::Origin::Create(url)));
return file_system_url.is_valid();
}
}
BlockedSchemeNavigationThrottle::BlockedSchemeNavigationThrottle(
NavigationHandle* navigation_handle)
: NavigationThrottle(navigation_handle) {}
BlockedSchemeNavigationThrottle::~BlockedSchemeNavigationThrottle() {}
NavigationThrottle::ThrottleCheckResult
BlockedSchemeNavigationThrottle::WillStartRequest() {
NavigationRequest* request = NavigationRequest::From(navigation_handle());
if (!request->GetURL().SchemeIs(url::kFileSystemScheme))
return PROCEED;
if (base::FeatureList::IsEnabled(blink::features::kFileSystemUrlNavigation))
return PROCEED;
RenderFrameHost* top_frame =
request->frame_tree_node()->frame_tree().root()->current_frame_host();
BrowserContext* browser_context = top_frame->GetBrowserContext();
if (base::FeatureList::IsEnabled(
blink::features::kFileSystemUrlNavigationForChromeAppsOnly) &&
!IsExternalMountedFile(request->GetURL()) &&
(url::Origin::Create(request->GetURL()) ==
request->GetInitiatorOrigin()) &&
GetContentClient()->browser()->IsFileSystemURLNavigationAllowed(
browser_context, request->GetURL())) {
return PROCEED;
}
top_frame->AddMessageToConsole(
blink::mojom::ConsoleMessageLevel::kError,
base::StringPrintf(kAnyFrameConsoleError,
request->GetURL().scheme().c_str(),
request->GetURL().spec().c_str()));
return CANCEL;
}
NavigationThrottle::ThrottleCheckResult
BlockedSchemeNavigationThrottle::WillProcessResponse() {
NavigationRequest* request = NavigationRequest::From(navigation_handle());
if (request->IsDownload())
return PROCEED;
RenderFrameHost* top_frame =
request->frame_tree_node()->frame_tree().root()->current_frame_host();
top_frame->AddMessageToConsole(
blink::mojom::ConsoleMessageLevel::kError,
base::StringPrintf(kConsoleError, request->GetURL().scheme().c_str(),
request->GetURL().spec().c_str()));
return CANCEL;
}
const char* BlockedSchemeNavigationThrottle::GetNameForLogging() {
return "BlockedSchemeNavigationThrottle";
}
// static
std::unique_ptr<NavigationThrottle>
BlockedSchemeNavigationThrottle::CreateThrottleForNavigation(
NavigationHandle* navigation_handle) {
NavigationRequest* request = NavigationRequest::From(navigation_handle);
// Create throttles when going to blocked schemes via renderer-initiated
// navigations (which are cross-document in the main frame). Note that history
// navigations can bypass this, because the blocked scheme must have
// originally committed in a permitted case (e.g., omnibox navigation).
if (request->IsInMainFrame() && request->IsRendererInitiated() &&
!request->IsSameDocument() &&
!NavigationTypeUtils::IsHistory(
request->common_params().navigation_type) &&
(request->GetURL().SchemeIs(url::kDataScheme) ||
request->GetURL().SchemeIs(url::kFileSystemScheme)) &&
!base::FeatureList::IsEnabled(
features::kAllowContentInitiatedDataUrlNavigations)) {
return std::make_unique<BlockedSchemeNavigationThrottle>(request);
}
// Block all renderer initiated navigations to filesystem: URLs except for
// when explicitly allowed by the embedder. These won't load anyway since no
// URL Loader exists for them, but the throttle lets us add a message to the
// console.
RenderFrameHost* current_frame_host =
request->frame_tree_node()->current_frame_host();
BrowserContext* browser_context = current_frame_host->GetBrowserContext();
// A navigation is permitted if the relevant feature flag is enabled, the
// request origin is equivalent to the initiator origin, and the embedder
// explicitly allows it.
bool is_navigation_allowed =
base::FeatureList::IsEnabled(
blink::features::kFileSystemUrlNavigationForChromeAppsOnly) &&
(url::Origin::Create(request->GetURL()) ==
request->GetInitiatorOrigin()) &&
GetContentClient()->browser()->IsFileSystemURLNavigationAllowed(
browser_context, request->GetURL());
if (!is_navigation_allowed &&
!base::FeatureList::IsEnabled(
blink::features::kFileSystemUrlNavigation) &&
request->IsRendererInitiated() &&
request->GetURL().SchemeIs(url::kFileSystemScheme)) {
return std::make_unique<BlockedSchemeNavigationThrottle>(request);
}
// Block any external mounted files.
if (!base::FeatureList::IsEnabled(
blink::features::kFileSystemUrlNavigation) &&
IsExternalMountedFile(request->GetURL())) {
return std::make_unique<BlockedSchemeNavigationThrottle>(request);
}
return nullptr;
}
} // namespace content
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