1 /*
2 * Copyright (C) 2011 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "config.h"
32 #include "DocumentThreadableLoader.h"
33
34 #include "AuthenticationChallenge.h"
35 #include "CrossOriginAccessControl.h"
36 #include "CrossOriginPreflightResultCache.h"
37 #include "Document.h"
38 #include "DocumentThreadableLoaderClient.h"
39 #include "Frame.h"
40 #include "FrameLoader.h"
41 #include "ResourceHandle.h"
42 #include "ResourceLoadScheduler.h"
43 #include "ResourceRequest.h"
44 #include "SecurityOrigin.h"
45 #include "SubresourceLoader.h"
46 #include "ThreadableLoaderClient.h"
47 #include <wtf/UnusedParam.h>
48
49 namespace WebCore {
50
loadResourceSynchronously(Document * document,const ResourceRequest & request,ThreadableLoaderClient & client,const ThreadableLoaderOptions & options)51 void DocumentThreadableLoader::loadResourceSynchronously(Document* document, const ResourceRequest& request, ThreadableLoaderClient& client, const ThreadableLoaderOptions& options)
52 {
53 // The loader will be deleted as soon as this function exits.
54 RefPtr<DocumentThreadableLoader> loader = adoptRef(new DocumentThreadableLoader(document, &client, LoadSynchronously, request, options, String()));
55 ASSERT(loader->hasOneRef());
56 }
57
create(Document * document,ThreadableLoaderClient * client,const ResourceRequest & request,const ThreadableLoaderOptions & options,const String & optionalOutgoingReferrer)58 PassRefPtr<DocumentThreadableLoader> DocumentThreadableLoader::create(Document* document, ThreadableLoaderClient* client, const ResourceRequest& request, const ThreadableLoaderOptions& options, const String& optionalOutgoingReferrer)
59 {
60 RefPtr<DocumentThreadableLoader> loader = adoptRef(new DocumentThreadableLoader(document, client, LoadAsynchronously, request, options, optionalOutgoingReferrer));
61 if (!loader->m_loader)
62 loader = 0;
63 return loader.release();
64 }
65
DocumentThreadableLoader(Document * document,ThreadableLoaderClient * client,BlockingBehavior blockingBehavior,const ResourceRequest & request,const ThreadableLoaderOptions & options,const String & optionalOutgoingReferrer)66 DocumentThreadableLoader::DocumentThreadableLoader(Document* document, ThreadableLoaderClient* client, BlockingBehavior blockingBehavior, const ResourceRequest& request, const ThreadableLoaderOptions& options, const String& optionalOutgoingReferrer)
67 : m_client(client)
68 , m_document(document)
69 , m_options(options)
70 , m_optionalOutgoingReferrer(optionalOutgoingReferrer)
71 , m_sameOriginRequest(document->securityOrigin()->canRequest(request.url()))
72 , m_async(blockingBehavior == LoadAsynchronously)
73 {
74 ASSERT(document);
75 ASSERT(client);
76 // Setting an outgoing referer is only supported in the async code path.
77 ASSERT(m_async || m_optionalOutgoingReferrer.isEmpty());
78
79 if (m_sameOriginRequest || m_options.crossOriginRequestPolicy == AllowCrossOriginRequests) {
80 loadRequest(request, DoSecurityCheck);
81 return;
82 }
83
84 if (m_options.crossOriginRequestPolicy == DenyCrossOriginRequests) {
85 m_client->didFail(ResourceError(errorDomainWebKitInternal, 0, request.url().string(), "Cross origin requests are not supported."));
86 return;
87 }
88
89 ASSERT(m_options.crossOriginRequestPolicy == UseAccessControl);
90
91 OwnPtr<ResourceRequest> crossOriginRequest = adoptPtr(new ResourceRequest(request));
92 crossOriginRequest->removeCredentials();
93 crossOriginRequest->setAllowCookies(m_options.allowCredentials);
94
95 if (!m_options.forcePreflight && isSimpleCrossOriginAccessRequest(crossOriginRequest->httpMethod(), crossOriginRequest->httpHeaderFields()))
96 makeSimpleCrossOriginAccessRequest(*crossOriginRequest);
97 else {
98 m_actualRequest = crossOriginRequest.release();
99
100 if (CrossOriginPreflightResultCache::shared().canSkipPreflight(document->securityOrigin()->toString(), m_actualRequest->url(), m_options.allowCredentials, m_actualRequest->httpMethod(), m_actualRequest->httpHeaderFields()))
101 preflightSuccess();
102 else
103 makeCrossOriginAccessRequestWithPreflight(*m_actualRequest);
104 }
105 }
106
makeSimpleCrossOriginAccessRequest(const ResourceRequest & request)107 void DocumentThreadableLoader::makeSimpleCrossOriginAccessRequest(const ResourceRequest& request)
108 {
109 ASSERT(isSimpleCrossOriginAccessRequest(request.httpMethod(), request.httpHeaderFields()));
110
111 // Cross-origin requests are only defined for HTTP. We would catch this when checking response headers later, but there is no reason to send a request that's guaranteed to be denied.
112 if (!request.url().protocolInHTTPFamily()) {
113 m_client->didFail(ResourceError(errorDomainWebKitInternal, 0, request.url().string(), "Cross origin requests are only supported for HTTP."));
114 return;
115 }
116
117 // Make a copy of the passed request so that we can modify some details.
118 ResourceRequest crossOriginRequest(request);
119 crossOriginRequest.setHTTPOrigin(m_document->securityOrigin()->toString());
120
121 loadRequest(crossOriginRequest, DoSecurityCheck);
122 }
123
makeCrossOriginAccessRequestWithPreflight(const ResourceRequest & request)124 void DocumentThreadableLoader::makeCrossOriginAccessRequestWithPreflight(const ResourceRequest& request)
125 {
126 ResourceRequest preflightRequest(request.url());
127 preflightRequest.removeCredentials();
128 preflightRequest.setHTTPOrigin(m_document->securityOrigin()->toString());
129 preflightRequest.setAllowCookies(m_options.allowCredentials);
130 preflightRequest.setHTTPMethod("OPTIONS");
131 preflightRequest.setHTTPHeaderField("Access-Control-Request-Method", request.httpMethod());
132
133 const HTTPHeaderMap& requestHeaderFields = request.httpHeaderFields();
134
135 if (requestHeaderFields.size() > 0) {
136 Vector<UChar> headerBuffer;
137 HTTPHeaderMap::const_iterator it = requestHeaderFields.begin();
138 append(headerBuffer, it->first);
139 ++it;
140
141 HTTPHeaderMap::const_iterator end = requestHeaderFields.end();
142 for (; it != end; ++it) {
143 headerBuffer.append(',');
144 headerBuffer.append(' ');
145 append(headerBuffer, it->first);
146 }
147
148 preflightRequest.setHTTPHeaderField("Access-Control-Request-Headers", String::adopt(headerBuffer));
149 }
150
151 preflightRequest.setPriority(request.priority());
152
153 loadRequest(preflightRequest, DoSecurityCheck);
154 }
155
~DocumentThreadableLoader()156 DocumentThreadableLoader::~DocumentThreadableLoader()
157 {
158 if (m_loader)
159 m_loader->clearClient();
160 }
161
cancel()162 void DocumentThreadableLoader::cancel()
163 {
164 if (!m_loader)
165 return;
166
167 m_loader->cancel();
168 m_loader->clearClient();
169 m_loader = 0;
170 m_client = 0;
171 }
172
setDefersLoading(bool value)173 void DocumentThreadableLoader::setDefersLoading(bool value)
174 {
175 if (m_loader)
176 m_loader->setDefersLoading(value);
177 }
178
willSendRequest(SubresourceLoader * loader,ResourceRequest & request,const ResourceResponse & redirectResponse)179 void DocumentThreadableLoader::willSendRequest(SubresourceLoader* loader, ResourceRequest& request, const ResourceResponse& redirectResponse)
180 {
181 ASSERT(m_client);
182 ASSERT_UNUSED(loader, loader == m_loader);
183
184 if (!isAllowedRedirect(request.url())) {
185 RefPtr<DocumentThreadableLoader> protect(this);
186 m_client->didFailRedirectCheck();
187 request = ResourceRequest();
188 } else {
189 if (m_client->isDocumentThreadableLoaderClient())
190 static_cast<DocumentThreadableLoaderClient*>(m_client)->willSendRequest(request, redirectResponse);
191 }
192 }
193
didSendData(SubresourceLoader * loader,unsigned long long bytesSent,unsigned long long totalBytesToBeSent)194 void DocumentThreadableLoader::didSendData(SubresourceLoader* loader, unsigned long long bytesSent, unsigned long long totalBytesToBeSent)
195 {
196 ASSERT(m_client);
197 ASSERT_UNUSED(loader, loader == m_loader);
198
199 m_client->didSendData(bytesSent, totalBytesToBeSent);
200 }
201
didReceiveResponse(SubresourceLoader * loader,const ResourceResponse & response)202 void DocumentThreadableLoader::didReceiveResponse(SubresourceLoader* loader, const ResourceResponse& response)
203 {
204 ASSERT(m_client);
205 ASSERT_UNUSED(loader, loader == m_loader);
206
207 String accessControlErrorDescription;
208 if (m_actualRequest) {
209 if (!passesAccessControlCheck(response, m_options.allowCredentials, m_document->securityOrigin(), accessControlErrorDescription)) {
210 preflightFailure(response.url(), accessControlErrorDescription);
211 return;
212 }
213
214 OwnPtr<CrossOriginPreflightResultCacheItem> preflightResult = adoptPtr(new CrossOriginPreflightResultCacheItem(m_options.allowCredentials));
215 if (!preflightResult->parse(response, accessControlErrorDescription)
216 || !preflightResult->allowsCrossOriginMethod(m_actualRequest->httpMethod(), accessControlErrorDescription)
217 || !preflightResult->allowsCrossOriginHeaders(m_actualRequest->httpHeaderFields(), accessControlErrorDescription)) {
218 preflightFailure(response.url(), accessControlErrorDescription);
219 return;
220 }
221
222 CrossOriginPreflightResultCache::shared().appendEntry(m_document->securityOrigin()->toString(), m_actualRequest->url(), preflightResult.release());
223 } else {
224 if (!m_sameOriginRequest && m_options.crossOriginRequestPolicy == UseAccessControl) {
225 if (!passesAccessControlCheck(response, m_options.allowCredentials, m_document->securityOrigin(), accessControlErrorDescription)) {
226 m_client->didFail(ResourceError(errorDomainWebKitInternal, 0, response.url().string(), accessControlErrorDescription));
227 return;
228 }
229 }
230
231 m_client->didReceiveResponse(response);
232 }
233 }
234
didReceiveData(SubresourceLoader * loader,const char * data,int dataLength)235 void DocumentThreadableLoader::didReceiveData(SubresourceLoader* loader, const char* data, int dataLength)
236 {
237 ASSERT(m_client);
238 ASSERT_UNUSED(loader, loader == m_loader);
239
240 // Preflight data should be invisible to clients.
241 if (m_actualRequest)
242 return;
243
244 m_client->didReceiveData(data, dataLength);
245 }
246
didReceiveCachedMetadata(SubresourceLoader * loader,const char * data,int dataLength)247 void DocumentThreadableLoader::didReceiveCachedMetadata(SubresourceLoader* loader, const char* data, int dataLength)
248 {
249 ASSERT(m_client);
250 ASSERT_UNUSED(loader, loader == m_loader);
251
252 // Preflight data should be invisible to clients.
253 if (m_actualRequest)
254 return;
255
256 m_client->didReceiveCachedMetadata(data, dataLength);
257 }
258
didFinishLoading(SubresourceLoader * loader,double finishTime)259 void DocumentThreadableLoader::didFinishLoading(SubresourceLoader* loader, double finishTime)
260 {
261 ASSERT(loader == m_loader);
262 ASSERT(m_client);
263 didFinishLoading(loader->identifier(), finishTime);
264 }
265
didFinishLoading(unsigned long identifier,double finishTime)266 void DocumentThreadableLoader::didFinishLoading(unsigned long identifier, double finishTime)
267 {
268 if (m_actualRequest) {
269 ASSERT(!m_sameOriginRequest);
270 ASSERT(m_options.crossOriginRequestPolicy == UseAccessControl);
271 preflightSuccess();
272 } else
273 m_client->didFinishLoading(identifier, finishTime);
274 }
275
didFail(SubresourceLoader * loader,const ResourceError & error)276 void DocumentThreadableLoader::didFail(SubresourceLoader* loader, const ResourceError& error)
277 {
278 ASSERT(m_client);
279 // m_loader may be null if we arrive here via SubresourceLoader::create in the ctor
280 ASSERT_UNUSED(loader, loader == m_loader || !m_loader);
281
282 m_client->didFail(error);
283 }
284
getShouldUseCredentialStorage(SubresourceLoader * loader,bool & shouldUseCredentialStorage)285 bool DocumentThreadableLoader::getShouldUseCredentialStorage(SubresourceLoader* loader, bool& shouldUseCredentialStorage)
286 {
287 ASSERT_UNUSED(loader, loader == m_loader || !m_loader);
288
289 if (!m_options.allowCredentials) {
290 shouldUseCredentialStorage = false;
291 return true;
292 }
293
294 return false; // Only FrameLoaderClient can ultimately permit credential use.
295 }
296
didReceiveAuthenticationChallenge(SubresourceLoader * loader,const AuthenticationChallenge & challenge)297 void DocumentThreadableLoader::didReceiveAuthenticationChallenge(SubresourceLoader* loader, const AuthenticationChallenge& challenge)
298 {
299 ASSERT(loader == m_loader);
300 // Users are not prompted for credentials for cross-origin requests.
301 if (!m_sameOriginRequest) {
302 #if PLATFORM(MAC) || USE(CFNETWORK) || USE(CURL)
303 loader->handle()->receivedRequestToContinueWithoutCredential(challenge);
304 #else
305 // These platforms don't provide a way to continue without credentials, cancel the load altogether.
306 UNUSED_PARAM(challenge);
307 RefPtr<DocumentThreadableLoader> protect(this);
308 m_client->didFail(loader->blockedError());
309 cancel();
310 #endif
311 }
312 }
313
receivedCancellation(SubresourceLoader * loader,const AuthenticationChallenge & challenge)314 void DocumentThreadableLoader::receivedCancellation(SubresourceLoader* loader, const AuthenticationChallenge& challenge)
315 {
316 ASSERT(m_client);
317 ASSERT_UNUSED(loader, loader == m_loader);
318 m_client->didReceiveAuthenticationCancellation(challenge.failureResponse());
319 }
320
preflightSuccess()321 void DocumentThreadableLoader::preflightSuccess()
322 {
323 OwnPtr<ResourceRequest> actualRequest;
324 actualRequest.swap(m_actualRequest);
325
326 actualRequest->setHTTPOrigin(m_document->securityOrigin()->toString());
327
328 // It should be ok to skip the security check since we already asked about the preflight request.
329 loadRequest(*actualRequest, SkipSecurityCheck);
330 }
331
preflightFailure(const String & url,const String & errorDescription)332 void DocumentThreadableLoader::preflightFailure(const String& url, const String& errorDescription)
333 {
334 m_actualRequest = nullptr; // Prevent didFinishLoading() from bypassing access check.
335 m_client->didFail(ResourceError(errorDomainWebKitInternal, 0, url, errorDescription));
336 }
337
loadRequest(const ResourceRequest & request,SecurityCheckPolicy securityCheck)338 void DocumentThreadableLoader::loadRequest(const ResourceRequest& request, SecurityCheckPolicy securityCheck)
339 {
340 // Any credential should have been removed from the cross-site requests.
341 const KURL& requestURL = request.url();
342 ASSERT(m_sameOriginRequest || requestURL.user().isEmpty());
343 ASSERT(m_sameOriginRequest || requestURL.pass().isEmpty());
344
345 if (m_async) {
346 // Don't sniff content or send load callbacks for the preflight request.
347 bool sendLoadCallbacks = m_options.sendLoadCallbacks && !m_actualRequest;
348 bool sniffContent = m_options.sniffContent && !m_actualRequest;
349
350 // Clear the loader so that any callbacks from SubresourceLoader::create will not have the old loader.
351 m_loader = 0;
352 m_loader = resourceLoadScheduler()->scheduleSubresourceLoad(m_document->frame(), this, request, ResourceLoadPriorityMedium, securityCheck, sendLoadCallbacks,
353 sniffContent, m_optionalOutgoingReferrer);
354 return;
355 }
356
357 // FIXME: ThreadableLoaderOptions.sniffContent is not supported for synchronous requests.
358 StoredCredentials storedCredentials = m_options.allowCredentials ? AllowStoredCredentials : DoNotAllowStoredCredentials;
359
360 Vector<char> data;
361 ResourceError error;
362 ResourceResponse response;
363 unsigned long identifier = std::numeric_limits<unsigned long>::max();
364 if (m_document->frame())
365 identifier = m_document->frame()->loader()->loadResourceSynchronously(request, storedCredentials, error, response, data);
366
367 // No exception for file:/// resources, see <rdar://problem/4962298>.
368 // Also, if we have an HTTP response, then it wasn't a network error in fact.
369 if (!error.isNull() && !requestURL.isLocalFile() && response.httpStatusCode() <= 0) {
370 m_client->didFail(error);
371 return;
372 }
373
374 // FIXME: FrameLoader::loadSynchronously() does not tell us whether a redirect happened or not, so we guess by comparing the
375 // request and response URLs. This isn't a perfect test though, since a server can serve a redirect to the same URL that was
376 // requested. Also comparing the request and response URLs as strings will fail if the requestURL still has its credentials.
377 if (requestURL != response.url() && !isAllowedRedirect(response.url())) {
378 m_client->didFailRedirectCheck();
379 return;
380 }
381
382 didReceiveResponse(0, response);
383
384 const char* bytes = static_cast<const char*>(data.data());
385 int len = static_cast<int>(data.size());
386 didReceiveData(0, bytes, len);
387
388 didFinishLoading(identifier, 0.0);
389 }
390
isAllowedRedirect(const KURL & url)391 bool DocumentThreadableLoader::isAllowedRedirect(const KURL& url)
392 {
393 if (m_options.crossOriginRequestPolicy == AllowCrossOriginRequests)
394 return true;
395
396 // FIXME: We need to implement access control for each redirect. This will require some refactoring though, because the code
397 // that processes redirects doesn't know about access control and expects a synchronous answer from its client about whether
398 // a redirect should proceed.
399 return m_sameOriginRequest && m_document->securityOrigin()->canRequest(url);
400 }
401
402 } // namespace WebCore
403