DocumentThreadableLoader::DocumentThreadableLoader(Document& document, ThreadableLoaderClient& client, BlockingBehavior blockingBehavior, const ResourceRequest& request, const ThreadableLoaderOptions& options, std::unique_ptr<ContentSecurityPolicy>&& contentSecurityPolicy)
: m_client(&client)
, m_document(document)
, m_options(options)
, m_sameOriginRequest(securityOrigin()->canRequest(request.url()))
, m_simpleRequest(true)
, m_async(blockingBehavior == LoadAsynchronously)
, m_contentSecurityPolicy(WTFMove(contentSecurityPolicy))
{
// Setting an outgoing referer is only supported in the async code path.
ASSERT(m_async || request.httpReferrer().isEmpty());
ASSERT_WITH_SECURITY_IMPLICATION(isAllowedByContentSecurityPolicy(request.url()));
if (m_sameOriginRequest || m_options.crossOriginRequestPolicy == AllowCrossOriginRequests) {
loadRequest(request, DoSecurityCheck);
return;
}
if (m_options.crossOriginRequestPolicy == DenyCrossOriginRequests) {
m_client->didFail(ResourceError(errorDomainWebKitInternal, 0, request.url(), "Cross origin requests are not supported."));
return;
}
makeCrossOriginAccessRequest(request);
}
DocumentThreadableLoader::DocumentThreadableLoader(Document* document, ThreadableLoaderClient* client, BlockingBehavior blockingBehavior, const ResourceRequest& request, const ThreadableLoaderOptions& options)
: m_client(client)
, m_document(document)
, m_options(options)
, m_sameOriginRequest(securityOrigin()->canRequest(request.url()))
, m_simpleRequest(true)
, m_async(blockingBehavior == LoadAsynchronously)
#if ENABLE(INSPECTOR)
, m_preflightRequestIdentifier(0)
#endif
{
ASSERT(document);
ASSERT(client);
// Setting an outgoing referer is only supported in the async code path.
ASSERT(m_async || request.httpReferrer().isEmpty());
if (m_sameOriginRequest || m_options.crossOriginRequestPolicy == AllowCrossOriginRequests) {
loadRequest(request, DoSecurityCheck);
return;
}
if (m_options.crossOriginRequestPolicy == DenyCrossOriginRequests) {
m_client->didFail(ResourceError(errorDomainWebKitInternal, 0, request.url().string(), "Cross origin requests are not supported."));
return;
}
makeCrossOriginAccessRequest(request);
}
void XMLHttpRequest::createRequest(ExceptionCode& ec)
{
// Upload event listeners should be disallowed for simple cross-origin requests, because POSTing to an URL that does not
// permit cross origin requests should look exactly like POSTing to an URL that does not respond at all. If a listener exists
// when creating the request, it will force preflight.
// Also, only async requests support upload progress events.
m_uploadEventsAllowed = false;
if (m_async) {
dispatchLoadStartEvent();
if (m_requestEntityBody && m_upload) {
m_uploadEventsAllowed = m_upload->hasListeners();
m_upload->dispatchLoadStartEvent();
}
}
m_sameOriginRequest = scriptExecutionContext()->securityOrigin()->canRequest(m_url);
if (!m_sameOriginRequest) {
makeCrossOriginAccessRequest(ec);
return;
}
m_uploadEventsAllowed = true;
makeSameOriginRequest(ec);
}
void DocumentThreadableLoader::redirectReceived(CachedResource* resource, ResourceRequest& request, const ResourceResponse& redirectResponse)
{
ASSERT(m_client);
ASSERT_UNUSED(resource, resource == m_resource);
Ref<DocumentThreadableLoader> protectedThis(*this);
if (!isAllowedByContentSecurityPolicy(request.url(), !redirectResponse.isNull())) {
m_client->didFailRedirectCheck();
request = ResourceRequest();
return;
}
// Allow same origin requests to continue after allowing clients to audit the redirect.
if (isAllowedRedirect(request.url()))
return;
// When using access control, only simple cross origin requests are allowed to redirect. The new request URL must have a supported
// scheme and not contain the userinfo production. In addition, the redirect response must pass the access control check if the
// original request was not same-origin.
if (m_options.crossOriginRequestPolicy == UseAccessControl) {
bool allowRedirect = false;
if (m_simpleRequest) {
String accessControlErrorDescription;
allowRedirect = isValidCrossOriginRedirectionURL(request.url())
&& (m_sameOriginRequest || passesAccessControlCheck(redirectResponse, m_options.allowCredentials(), securityOrigin(), accessControlErrorDescription));
}
if (allowRedirect) {
if (m_resource)
clearResource();
RefPtr<SecurityOrigin> originalOrigin = SecurityOrigin::createFromString(redirectResponse.url());
RefPtr<SecurityOrigin> requestOrigin = SecurityOrigin::createFromString(request.url());
// If the original request wasn't same-origin, then if the request URL origin is not same origin with the original URL origin,
// set the source origin to a globally unique identifier. (If the original request was same-origin, the origin of the new request
// should be the original URL origin.)
if (!m_sameOriginRequest && !originalOrigin->isSameSchemeHostPort(requestOrigin.get()))
m_options.securityOrigin = SecurityOrigin::createUnique();
// Force any subsequent request to use these checks.
m_sameOriginRequest = false;
// Since the request is no longer same-origin, if the user didn't request credentials in
// the first place, update our state so we neither request them nor expect they must be allowed.
if (m_options.credentialRequest() == ClientDidNotRequestCredentials)
m_options.setAllowCredentials(DoNotAllowStoredCredentials);
cleanRedirectedRequestForAccessControl(request);
makeCrossOriginAccessRequest(request);
return;
}
}
m_client->didFailRedirectCheck();
request = ResourceRequest();
}
void DocumentThreadableLoader::dispatchInitialRequest(const ResourceRequest& request)
{
if (m_sameOriginRequest || m_options.crossOriginRequestPolicy == AllowCrossOriginRequests) {
loadRequest(request, m_resourceLoaderOptions);
return;
}
ASSERT(m_options.crossOriginRequestPolicy == UseAccessControl);
makeCrossOriginAccessRequest(request);
// |this| may be dead here in async mode.
}
void DocumentThreadableLoader::redirectReceived(CachedResource* resource, ResourceRequest& request, const ResourceResponse& redirectResponse)
{
ASSERT(m_client);
ASSERT_UNUSED(resource, resource == m_resource);
RefPtr<DocumentThreadableLoader> protect(this);
// Allow same origin requests to continue after allowing clients to audit the redirect.
if (isAllowedRedirect(request.url())) {
if (m_client->isDocumentThreadableLoaderClient())
static_cast<DocumentThreadableLoaderClient*>(m_client)->willSendRequest(request, redirectResponse);
return;
}
// When using access control, only simple cross origin requests are allowed to redirect. The new request URL must have a supported
// scheme and not contain the userinfo production. In addition, the redirect response must pass the access control check.
if (m_options.crossOriginRequestPolicy == UseAccessControl) {
bool allowRedirect = false;
if (m_simpleRequest) {
String accessControlErrorDescription;
allowRedirect = SchemeRegistry::shouldTreatURLSchemeAsCORSEnabled(request.url().protocol())
&& request.url().user().isEmpty()
&& request.url().pass().isEmpty()
&& passesAccessControlCheck(redirectResponse, m_options.allowCredentials, securityOrigin(), accessControlErrorDescription);
}
if (allowRedirect) {
if (m_resource)
clearResource();
RefPtr<SecurityOrigin> originalOrigin = SecurityOrigin::createFromString(redirectResponse.url());
RefPtr<SecurityOrigin> requestOrigin = SecurityOrigin::createFromString(request.url());
// If the request URL origin is not same origin with the original URL origin, set source origin to a globally unique identifier.
if (!originalOrigin->isSameSchemeHostPort(requestOrigin.get()))
m_options.securityOrigin = SecurityOrigin::createUnique();
// Force any subsequent requests to use these checks.
m_sameOriginRequest = false;
// Remove any headers that may have been added by the network layer that cause access control to fail.
request.clearHTTPContentType();
request.clearHTTPReferrer();
request.clearHTTPOrigin();
request.clearHTTPUserAgent();
request.clearHTTPAccept();
makeCrossOriginAccessRequest(request);
return;
}
}
m_client->didFailRedirectCheck();
request = ResourceRequest();
}
void DocumentThreadableLoader::dispatchInitialRequest(
const ResourceRequest& request) {
if (!request.isExternalRequest() &&
(m_sameOriginRequest ||
m_options.crossOriginRequestPolicy == AllowCrossOriginRequests)) {
loadRequest(request, m_resourceLoaderOptions);
return;
}
DCHECK(m_options.crossOriginRequestPolicy == UseAccessControl ||
request.isExternalRequest());
makeCrossOriginAccessRequest(request);
}
// In this method, we can clear |request| to tell content::WebURLLoaderImpl of
// Chromium not to follow the redirect. This works only when this method is
// called by RawResource::willSendRequest(). If called by
// RawResource::didAddClient(), clearing |request| won't be propagated to
// content::WebURLLoaderImpl. So, this loader must also get detached from the
// resource by calling clearResource().
bool DocumentThreadableLoader::redirectReceived(
Resource* resource,
const ResourceRequest& request,
const ResourceResponse& redirectResponse) {
DCHECK(m_client);
DCHECK_EQ(resource, this->resource());
DCHECK(m_async);
m_checker.redirectReceived();
if (!m_actualRequest.isNull()) {
reportResponseReceived(resource->identifier(), redirectResponse);
handlePreflightFailure(redirectResponse.url().getString(),
"Response for preflight is invalid (redirect)");
return false;
}
if (m_redirectMode == WebURLRequest::FetchRedirectModeManual) {
// We use |m_redirectMode| to check the original redirect mode. |request| is
// a new request for redirect. So we don't set the redirect mode of it in
// WebURLLoaderImpl::Context::OnReceivedRedirect().
DCHECK(request.useStreamOnResponse());
// There is no need to read the body of redirect response because there is
// no way to read the body of opaque-redirect filtered response's internal
// response.
// TODO(horo): If we support any API which expose the internal body, we will
// have to read the body. And also HTTPCache changes will be needed because
// it doesn't store the body of redirect responses.
responseReceived(resource, redirectResponse,
WTF::makeUnique<EmptyDataHandle>());
if (m_client) {
DCHECK(m_actualRequest.isNull());
notifyFinished(resource);
}
return false;
}
if (m_redirectMode == WebURLRequest::FetchRedirectModeError) {
ThreadableLoaderClient* client = m_client;
clear();
client->didFailRedirectCheck();
return false;
}
// Allow same origin requests to continue after allowing clients to audit the
// redirect.
if (isAllowedRedirect(request.url())) {
m_client->didReceiveRedirectTo(request.url());
if (m_client->isDocumentThreadableLoaderClient()) {
return static_cast<DocumentThreadableLoaderClient*>(m_client)
->willFollowRedirect(request, redirectResponse);
}
return true;
}
if (m_corsRedirectLimit <= 0) {
ThreadableLoaderClient* client = m_client;
clear();
client->didFailRedirectCheck();
return false;
}
--m_corsRedirectLimit;
InspectorInstrumentation::didReceiveCORSRedirectResponse(
document().frame(), resource->identifier(),
document().frame()->loader().documentLoader(), redirectResponse,
resource);
bool allowRedirect = false;
String accessControlErrorDescription;
if (!CrossOriginAccessControl::isLegalRedirectLocation(
request.url(), accessControlErrorDescription)) {
accessControlErrorDescription =
"Redirect from '" + redirectResponse.url().getString() +
"' has been blocked by CORS policy: " + accessControlErrorDescription;
} else if (!m_sameOriginRequest &&
!passesAccessControlCheck(
redirectResponse, effectiveAllowCredentials(),
getSecurityOrigin(), accessControlErrorDescription,
m_requestContext)) {
// The redirect response must pass the access control check if the original
// request was not same-origin.
accessControlErrorDescription =
"Redirect from '" + redirectResponse.url().getString() + "' to '" +
request.url().getString() + "' has been blocked by CORS policy: " +
accessControlErrorDescription;
} else {
allowRedirect = true;
}
if (!allowRedirect) {
ThreadableLoaderClient* client = m_client;
clear();
client->didFailAccessControlCheck(ResourceError(
errorDomainBlinkInternal, 0, redirectResponse.url().getString(),
accessControlErrorDescription));
return false;
}
m_client->didReceiveRedirectTo(request.url());
// FIXME: consider combining this with CORS redirect handling performed by
// CrossOriginAccessControl::handleRedirect().
clearResource();
// If the original request wasn't same-origin, then if the request URL origin
// is not same origin with the original URL origin, set the source origin to a
// globally unique identifier. (If the original request was same-origin, the
// origin of the new request should be the original URL origin.)
if (!m_sameOriginRequest) {
RefPtr<SecurityOrigin> originalOrigin =
SecurityOrigin::create(redirectResponse.url());
RefPtr<SecurityOrigin> requestOrigin =
SecurityOrigin::create(request.url());
if (!originalOrigin->isSameSchemeHostPort(requestOrigin.get()))
m_securityOrigin = SecurityOrigin::createUnique();
}
// Force any subsequent requests to use these checks.
m_sameOriginRequest = false;
// Since the request is no longer same-origin, if the user didn't request
// credentials in the first place, update our state so we neither request them
// nor expect they must be allowed.
if (m_resourceLoaderOptions.credentialsRequested ==
ClientDidNotRequestCredentials)
m_forceDoNotAllowStoredCredentials = true;
// Save the referrer to use when following the redirect.
m_overrideReferrer = true;
m_referrerAfterRedirect =
Referrer(request.httpReferrer(), request.getReferrerPolicy());
ResourceRequest crossOriginRequest(request);
// Remove any headers that may have been added by the network layer that cause
// access control to fail.
crossOriginRequest.clearHTTPReferrer();
crossOriginRequest.clearHTTPOrigin();
crossOriginRequest.clearHTTPUserAgent();
// Add any request headers which we previously saved from the
// original request.
for (const auto& header : m_requestHeaders)
crossOriginRequest.setHTTPHeaderField(header.key, header.value);
makeCrossOriginAccessRequest(crossOriginRequest);
return false;
}
// In this method, we can clear |request| to tell content::WebURLLoaderImpl of
// Chromium not to follow the redirect. This works only when this method is
// called by RawResource::willSendRequest(). If called by
// RawResource::didAddClient(), clearing |request| won't be propagated
// to content::WebURLLoaderImpl. So, this loader must also get detached from
// the resource by calling clearResource().
void DocumentThreadableLoader::redirectReceived(Resource* resource, ResourceRequest& request, const ResourceResponse& redirectResponse)
{
ASSERT(m_client);
ASSERT_UNUSED(resource, resource == this->resource());
ASSERT(m_async);
if (!m_actualRequest.isNull()) {
reportResponseReceived(resource->identifier(), redirectResponse);
handlePreflightFailure(redirectResponse.url().string(), "Response for preflight is invalid (redirect)");
// |this| may be dead here.
request = ResourceRequest();
return;
}
if (m_redirectMode == WebURLRequest::FetchRedirectModeManual) {
// Keep |this| alive even if the client release a reference in
// responseReceived().
RefPtr<DocumentThreadableLoader> protect(this);
// We use |m_redirectMode| to check the original redirect mode.
// |request| is a new request for redirect. So we don't set the redirect
// mode of it in WebURLLoaderImpl::Context::OnReceivedRedirect().
ASSERT(request.useStreamOnResponse());
// There is no need to read the body of redirect response because there
// is no way to read the body of opaque-redirect filtered response's
// internal response.
// TODO(horo): If we support any API which expose the internal body, we
// will have to read the body. And also HTTPCache changes will be needed
// because it doesn't store the body of redirect responses.
responseReceived(resource, redirectResponse, adoptPtr(new EmptyDataHandle()));
if (m_client) {
ASSERT(m_actualRequest.isNull());
notifyFinished(resource);
}
request = ResourceRequest();
return;
}
if (m_redirectMode == WebURLRequest::FetchRedirectModeError || !isAllowedByContentSecurityPolicy(request.url(), ContentSecurityPolicy::DidRedirect)) {
ThreadableLoaderClient* client = m_client;
clear();
client->didFailRedirectCheck();
// |this| may be dead here.
request = ResourceRequest();
return;
}
// Allow same origin requests to continue after allowing clients to audit the redirect.
if (isAllowedRedirect(request.url())) {
if (m_client->isDocumentThreadableLoaderClient())
static_cast<DocumentThreadableLoaderClient*>(m_client)->willFollowRedirect(request, redirectResponse);
return;
}
if (m_corsRedirectLimit <= 0) {
ThreadableLoaderClient* client = m_client;
clear();
client->didFailRedirectCheck();
// |this| may be dead here.
} else if (m_options.crossOriginRequestPolicy == UseAccessControl) {
--m_corsRedirectLimit;
InspectorInstrumentation::didReceiveCORSRedirectResponse(document().frame(), resource->identifier(), document().frame()->loader().documentLoader(), redirectResponse, 0);
bool allowRedirect = false;
String accessControlErrorDescription;
// Non-simple cross origin requests (both preflight and actual one) are
// not allowed to follow redirect.
if (m_crossOriginNonSimpleRequest) {
accessControlErrorDescription = "The request was redirected to '"+ request.url().string() + "', which is disallowed for cross-origin requests that require preflight.";
} else {
// The redirect response must pass the access control check if the
// original request was not same-origin.
allowRedirect = CrossOriginAccessControl::isLegalRedirectLocation(request.url(), accessControlErrorDescription)
&& (m_sameOriginRequest || passesAccessControlCheck(redirectResponse, effectiveAllowCredentials(), securityOrigin(), accessControlErrorDescription, m_requestContext));
}
if (allowRedirect) {
// FIXME: consider combining this with CORS redirect handling performed by
// CrossOriginAccessControl::handleRedirect().
clearResource();
RefPtr<SecurityOrigin> originalOrigin = SecurityOrigin::create(redirectResponse.url());
RefPtr<SecurityOrigin> requestOrigin = SecurityOrigin::create(request.url());
// If the original request wasn't same-origin, then if the request URL origin is not same origin with the original URL origin,
// set the source origin to a globally unique identifier. (If the original request was same-origin, the origin of the new request
// should be the original URL origin.)
if (!m_sameOriginRequest && !originalOrigin->isSameSchemeHostPort(requestOrigin.get()))
m_securityOrigin = SecurityOrigin::createUnique();
// Force any subsequent requests to use these checks.
m_sameOriginRequest = false;
// Since the request is no longer same-origin, if the user didn't request credentials in
// the first place, update our state so we neither request them nor expect they must be allowed.
if (m_resourceLoaderOptions.credentialsRequested == ClientDidNotRequestCredentials)
m_forceDoNotAllowStoredCredentials = true;
// Remove any headers that may have been added by the network layer that cause access control to fail.
request.clearHTTPReferrer();
request.clearHTTPOrigin();
request.clearHTTPUserAgent();
// Add any CORS simple request headers which we previously saved from the original request.
for (const auto& header : m_simpleRequestHeaders)
request.setHTTPHeaderField(header.key, header.value);
makeCrossOriginAccessRequest(request);
// |this| may be dead here.
return;
}
ThreadableLoaderClient* client = m_client;
clear();
client->didFailAccessControlCheck(ResourceError(errorDomainBlinkInternal, 0, redirectResponse.url().string(), accessControlErrorDescription));
// |this| may be dead here.
} else {
ThreadableLoaderClient* client = m_client;
clear();
client->didFailRedirectCheck();
// |this| may be dead here.
}
request = ResourceRequest();
}
void DocumentThreadableLoader::redirectReceived(Resource* resource, ResourceRequest& request, const ResourceResponse& redirectResponse)
{
ASSERT(m_client);
ASSERT_UNUSED(resource, resource == this->resource());
RefPtr<DocumentThreadableLoader> protect(this);
if (!isAllowedByPolicy(request.url())) {
m_client->didFailRedirectCheck();
request = ResourceRequest();
return;
}
// Allow same origin requests to continue after allowing clients to audit the redirect.
if (isAllowedRedirect(request.url())) {
if (m_client->isDocumentThreadableLoaderClient())
static_cast<DocumentThreadableLoaderClient*>(m_client)->willSendRequest(request, redirectResponse);
return;
}
// When using access control, only simple cross origin requests are allowed to redirect. The new request URL must have a supported
// scheme and not contain the userinfo production. In addition, the redirect response must pass the access control check if the
// original request was not same-origin.
if (m_options.crossOriginRequestPolicy == UseAccessControl) {
InspectorInstrumentation::didReceiveCORSRedirectResponse(m_document->frame(), resource->identifier(), m_document->frame()->loader().documentLoader(), redirectResponse, 0);
bool allowRedirect = false;
String accessControlErrorDescription;
if (m_simpleRequest) {
allowRedirect = CrossOriginAccessControl::isLegalRedirectLocation(request.url(), accessControlErrorDescription)
&& (m_sameOriginRequest || passesAccessControlCheck(redirectResponse, m_options.allowCredentials, securityOrigin(), accessControlErrorDescription));
} else {
accessControlErrorDescription = "The request was redirected to '"+ request.url().string() + "', which is disallowed for cross-origin requests that require preflight.";
}
if (allowRedirect) {
// FIXME: consider combining this with CORS redirect handling performed by
// CrossOriginAccessControl::handleRedirect().
clearResource();
RefPtr<SecurityOrigin> originalOrigin = SecurityOrigin::create(redirectResponse.url());
RefPtr<SecurityOrigin> requestOrigin = SecurityOrigin::create(request.url());
// If the original request wasn't same-origin, then if the request URL origin is not same origin with the original URL origin,
// set the source origin to a globally unique identifier. (If the original request was same-origin, the origin of the new request
// should be the original URL origin.)
if (!m_sameOriginRequest && !originalOrigin->isSameSchemeHostPort(requestOrigin.get()))
m_options.securityOrigin = SecurityOrigin::createUnique();
// Force any subsequent requests to use these checks.
m_sameOriginRequest = false;
// Since the request is no longer same-origin, if the user didn't request credentials in
// the first place, update our state so we neither request them nor expect they must be allowed.
if (m_options.credentialsRequested == ClientDidNotRequestCredentials)
m_options.allowCredentials = DoNotAllowStoredCredentials;
// Remove any headers that may have been added by the network layer that cause access control to fail.
request.clearHTTPContentType();
request.clearHTTPReferrer();
request.clearHTTPOrigin();
request.clearHTTPUserAgent();
request.clearHTTPAccept();
makeCrossOriginAccessRequest(request);
return;
}
ResourceError error(errorDomainBlinkInternal, 0, redirectResponse.url().string(), accessControlErrorDescription);
m_client->didFailAccessControlCheck(error);
} else {
m_client->didFailRedirectCheck();
}
request = ResourceRequest();
}
