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/*
* Copyright (C) 2011, Google Inc. All rights reserved.
* Copyright (C) 2014, Samsung Electronics. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
#include "third_party/blink/renderer/modules/navigatorcontentutils/navigator_content_utils.h"
#include "base/stl_util.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/frame/web_local_frame_impl.h"
#include "third_party/blink/renderer/modules/navigatorcontentutils/navigator_content_utils_client.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/instrumentation/use_counter.h"
#include "third_party/blink/renderer/platform/weborigin/security_origin.h"
#include "third_party/blink/renderer/platform/wtf/std_lib_extras.h"
#include "third_party/blink/renderer/platform/wtf/text/string_builder.h"
namespace blink {
const char NavigatorContentUtils::kSupplementName[] = "NavigatorContentUtils";
static const HashSet<String>& SupportedSchemes() {
DEFINE_STATIC_LOCAL(
HashSet<String>, supported_schemes,
({
"bitcoin", "geo", "im", "irc", "ircs", "magnet", "mailto",
"mms", "news", "nntp", "openpgp4fpr", "sip", "sms", "smsto",
"ssh", "tel", "urn", "webcal", "wtai", "xmpp",
}));
return supported_schemes;
}
static bool VerifyCustomHandlerURL(const Document& document,
const String& url,
ExceptionState& exception_state) {
// The specification requires that it is a SyntaxError if the "%s" token is
// not present.
static const char kToken[] = "%s";
int index = url.Find(kToken);
if (-1 == index) {
exception_state.ThrowDOMException(
DOMExceptionCode::kSyntaxError,
"The url provided ('" + url + "') does not contain '%s'.");
return false;
}
// It is also a SyntaxError if the custom handler URL, as created by removing
// the "%s" token and prepending the base url, does not resolve.
String new_url = url;
new_url.Remove(index, base::size(kToken) - 1);
KURL kurl = document.CompleteURL(new_url);
if (kurl.IsEmpty() || !kurl.IsValid()) {
exception_state.ThrowDOMException(
DOMExceptionCode::kSyntaxError,
"The custom handler URL created by removing '%s' and prepending '" +
document.BaseURL().GetString() + "' is invalid.");
return false;
}
// Although not required by the spec, the spec allows additional security
// checks. Bugs have arisen from allowing non-http/https URLs, e.g.
// https://crbug.com/971917 and it doesn't make a lot of sense to support
// them. We do need to allow extensions to continue using the API.
if (!kurl.ProtocolIsInHTTPFamily() && !kurl.ProtocolIs("chrome-extension")) {
exception_state.ThrowSecurityError(
"The scheme of the url provided must be 'https' or "
"'chrome-extension'.");
return false;
}
// The specification says that the API throws SecurityError exception if the
// URL's origin differs from the document's origin.
if (!document.GetSecurityOrigin()->CanRequest(kurl)) {
exception_state.ThrowSecurityError(
"Can only register custom handler in the document's origin.");
return false;
}
return true;
}
static bool VerifyCustomHandlerScheme(const String& scheme,
ExceptionState& exception_state) {
if (!IsValidProtocol(scheme)) {
exception_state.ThrowSecurityError(
"The scheme name '" + scheme +
"' is not allowed by URI syntax (RFC3986).");
return false;
}
if (scheme.StartsWith("web+")) {
// The specification requires that the length of scheme is at least five
// characters (including 'web+' prefix).
if (scheme.length() >= 5)
return true;
exception_state.ThrowSecurityError("The scheme name '" + scheme +
"' is less than five characters long.");
return false;
}
if (SupportedSchemes().Contains(scheme.LowerASCII()))
return true;
exception_state.ThrowSecurityError(
"The scheme '" + scheme +
"' doesn't belong to the scheme allowlist. "
"Please prefix non-allowlisted schemes "
"with the string 'web+'.");
return false;
}
NavigatorContentUtils& NavigatorContentUtils::From(Navigator& navigator,
LocalFrame& frame) {
NavigatorContentUtils* navigator_content_utils =
Supplement<Navigator>::From<NavigatorContentUtils>(navigator);
if (!navigator_content_utils) {
navigator_content_utils = MakeGarbageCollected<NavigatorContentUtils>(
navigator, MakeGarbageCollected<NavigatorContentUtilsClient>(&frame));
ProvideTo(navigator, navigator_content_utils);
}
return *navigator_content_utils;
}
NavigatorContentUtils::~NavigatorContentUtils() = default;
void NavigatorContentUtils::registerProtocolHandler(
Navigator& navigator,
const String& scheme,
const String& url,
const String& title,
ExceptionState& exception_state) {
LocalFrame* frame = navigator.GetFrame();
if (!frame)
return;
Document* document = frame->GetDocument();
DCHECK(document);
// Per the HTML specification, exceptions for arguments must be surfaced in
// the order of the arguments.
if (!VerifyCustomHandlerScheme(scheme, exception_state))
return;
if (!VerifyCustomHandlerURL(*document, url, exception_state))
return;
// Count usage; perhaps we can forbid this from cross-origin subframes as
// proposed in https://crbug.com/977083.
UseCounter::Count(
*document, frame->IsCrossOriginSubframe()
? WebFeature::kRegisterProtocolHandlerCrossOriginSubframe
: WebFeature::kRegisterProtocolHandlerSameOriginAsTop);
// Count usage. Context should now always be secure due to the same-origin
// check and the requirement that the calling context be secure.
UseCounter::Count(*document,
document->IsSecureContext()
? WebFeature::kRegisterProtocolHandlerSecureOrigin
: WebFeature::kRegisterProtocolHandlerInsecureOrigin);
NavigatorContentUtils::From(navigator, *frame)
.Client()
->RegisterProtocolHandler(scheme, document->CompleteURL(url), title);
}
void NavigatorContentUtils::unregisterProtocolHandler(
Navigator& navigator,
const String& scheme,
const String& url,
ExceptionState& exception_state) {
LocalFrame* frame = navigator.GetFrame();
if (!frame)
return;
Document* document = frame->GetDocument();
DCHECK(document);
if (!VerifyCustomHandlerScheme(scheme, exception_state))
return;
if (!VerifyCustomHandlerURL(*document, url, exception_state))
return;
NavigatorContentUtils::From(navigator, *frame)
.Client()
->UnregisterProtocolHandler(scheme, document->CompleteURL(url));
}
void NavigatorContentUtils::Trace(blink::Visitor* visitor) {
visitor->Trace(client_);
Supplement<Navigator>::Trace(visitor);
}
} // namespace blink
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