The Tor Browser / file comparison

comparison: dom/xbl/nsXBLDocumentInfo.cpp

dom/xbl/nsXBLDocumentInfo.cpp

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1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=2 sw=2 et tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6
7 #include "mozilla/DebugOnly.h"
8
9 #include "nsXBLDocumentInfo.h"
10 #include "nsIDocument.h"
11 #include "nsXBLPrototypeBinding.h"
12 #include "nsIScriptObjectPrincipal.h"
13 #include "nsIScriptContext.h"
14 #include "nsIDOMDocument.h"
15 #include "nsIDOMScriptObjectFactory.h"
16 #include "jsapi.h"
17 #include "jsfriendapi.h"
18 #include "nsIURI.h"
19 #include "nsIConsoleService.h"
20 #include "nsIScriptError.h"
21 #include "nsIChromeRegistry.h"
22 #include "nsIPrincipal.h"
23 #include "nsJSPrincipals.h"
24 #include "nsIScriptSecurityManager.h"
25 #include "nsContentUtils.h"
26 #include "nsCxPusher.h"
27 #include "nsDOMJSUtils.h"
28 #include "mozilla/Services.h"
29 #include "xpcpublic.h"
30 #include "mozilla/scache/StartupCache.h"
31 #include "mozilla/scache/StartupCacheUtils.h"
32 #include "nsCCUncollectableMarker.h"
33 #include "mozilla/dom/BindingUtils.h"
34 #include "mozilla/dom/URL.h"
35
36 using namespace mozilla;
37 using namespace mozilla::scache;
38 using namespace mozilla::dom;
39
40 static const char kXBLCachePrefix[] = "xblcache";
41
42 /* Implementation file */
43
44 static PLDHashOperator
45 TraverseProtos(const nsACString &aKey, nsXBLPrototypeBinding *aProto, void* aClosure)
46 {
47 nsCycleCollectionTraversalCallback *cb =
48 static_cast<nsCycleCollectionTraversalCallback*>(aClosure);
49 aProto->Traverse(*cb);
50 return PL_DHASH_NEXT;
51 }
52
53 static PLDHashOperator
54 UnlinkProtoJSObjects(const nsACString &aKey, nsXBLPrototypeBinding *aProto, void* aClosure)
55 {
56 aProto->UnlinkJSObjects();
57 return PL_DHASH_NEXT;
58 }
59
60 struct ProtoTracer
61 {
62 const TraceCallbacks &mCallbacks;
63 void *mClosure;
64 };
65
66 static PLDHashOperator
67 TraceProtos(const nsACString &aKey, nsXBLPrototypeBinding *aProto, void* aClosure)
68 {
69 ProtoTracer* closure = static_cast<ProtoTracer*>(aClosure);
70 aProto->Trace(closure->mCallbacks, closure->mClosure);
71 return PL_DHASH_NEXT;
72 }
73
74 NS_IMPL_CYCLE_COLLECTION_CLASS(nsXBLDocumentInfo)
75
76 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsXBLDocumentInfo)
77 if (tmp->mBindingTable) {
78 tmp->mBindingTable->EnumerateRead(UnlinkProtoJSObjects, nullptr);
79 }
80 NS_IMPL_CYCLE_COLLECTION_UNLINK(mDocument)
81 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
82 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsXBLDocumentInfo)
83 if (tmp->mDocument &&
84 nsCCUncollectableMarker::InGeneration(cb, tmp->mDocument->GetMarkedCCGeneration())) {
85 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
86 return NS_SUCCESS_INTERRUPTED_TRAVERSE;
87 }
88 NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocument)
89 if (tmp->mBindingTable) {
90 tmp->mBindingTable->EnumerateRead(TraverseProtos, &cb);
91 }
92 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
93 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
94 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsXBLDocumentInfo)
95 if (tmp->mBindingTable) {
96 ProtoTracer closure = { aCallbacks, aClosure };
97 tmp->mBindingTable->EnumerateRead(TraceProtos, &closure);
98 }
99 NS_IMPL_CYCLE_COLLECTION_TRACE_END
100
101 static void
102 UnmarkXBLJSObject(void* aP, const char* aName, void* aClosure)
103 {
104 JS::ExposeObjectToActiveJS(static_cast<JSObject*>(aP));
105 }
106
107 static PLDHashOperator
108 UnmarkProtos(const nsACString &aKey, nsXBLPrototypeBinding *aProto, void* aClosure)
109 {
110 aProto->Trace(TraceCallbackFunc(UnmarkXBLJSObject), nullptr);
111 return PL_DHASH_NEXT;
112 }
113
114 void
115 nsXBLDocumentInfo::MarkInCCGeneration(uint32_t aGeneration)
116 {
117 if (mDocument) {
118 mDocument->MarkUncollectableForCCGeneration(aGeneration);
119 }
120 // Unmark any JS we hold
121 if (mBindingTable) {
122 mBindingTable->EnumerateRead(UnmarkProtos, nullptr);
123 }
124 }
125
126 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsXBLDocumentInfo)
127 NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
128 NS_INTERFACE_MAP_ENTRY(nsISupports)
129 NS_INTERFACE_MAP_END
130
131 NS_IMPL_CYCLE_COLLECTING_ADDREF(nsXBLDocumentInfo)
132 NS_IMPL_CYCLE_COLLECTING_RELEASE(nsXBLDocumentInfo)
133
134 nsXBLDocumentInfo::nsXBLDocumentInfo(nsIDocument* aDocument)
135 : mDocument(aDocument),
136 mScriptAccess(true),
137 mIsChrome(false),
138 mFirstBinding(nullptr)
139 {
140 nsIURI* uri = aDocument->GetDocumentURI();
141 if (IsChromeURI(uri)) {
142 // Cache whether or not this chrome XBL can execute scripts.
143 nsCOMPtr<nsIXULChromeRegistry> reg =
144 mozilla::services::GetXULChromeRegistryService();
145 if (reg) {
146 bool allow = true;
147 reg->AllowScriptsForPackage(uri, &allow);
148 mScriptAccess = allow;
149 }
150 mIsChrome = true;
151 } else {
152 // If this binding isn't running with system principal, then it's running
153 // from a remote-XUL whitelisted domain. This is already a not-really-
154 // supported configuration (among other things, we don't use XBL scopes in
155 // that configuration for compatibility reasons). But we should still at
156 // least make an effort to prevent binding code from running if content
157 // script is disabled or if the source domain is blacklisted (since the
158 // source domain for remote XBL must always be the same as the source domain
159 // of the bound content).
160 //
161 // If we just ask the binding document if script is enabled, it will
162 // discover that it has no inner window, and return false. So instead, we
163 // short-circuit the normal compartment-managed script-disabling machinery,
164 // and query the policy for the URI directly.
165 bool allow;
166 nsIScriptSecurityManager* ssm = nsContentUtils::GetSecurityManager();
167 nsresult rv = ssm->PolicyAllowsScript(uri, &allow);
168 mScriptAccess = NS_SUCCEEDED(rv) && allow;
169 }
170 }
171
172 nsXBLDocumentInfo::~nsXBLDocumentInfo()
173 {
174 mozilla::DropJSObjects(this);
175 }
176
177 nsXBLPrototypeBinding*
178 nsXBLDocumentInfo::GetPrototypeBinding(const nsACString& aRef)
179 {
180 if (!mBindingTable)
181 return nullptr;
182
183 if (aRef.IsEmpty()) {
184 // Return our first binding
185 return mFirstBinding;
186 }
187
188 return mBindingTable->Get(aRef);
189 }
190
191 nsresult
192 nsXBLDocumentInfo::SetPrototypeBinding(const nsACString& aRef, nsXBLPrototypeBinding* aBinding)
193 {
194 if (!mBindingTable) {
195 mBindingTable = new nsClassHashtable<nsCStringHashKey, nsXBLPrototypeBinding>();
196 mozilla::HoldJSObjects(this);
197 }
198
199 NS_ENSURE_STATE(!mBindingTable->Get(aRef));
200 mBindingTable->Put(aRef, aBinding);
201
202 return NS_OK;
203 }
204
205 void
206 nsXBLDocumentInfo::RemovePrototypeBinding(const nsACString& aRef)
207 {
208 if (mBindingTable) {
209 nsAutoPtr<nsXBLPrototypeBinding> bindingToRemove;
210 mBindingTable->RemoveAndForget(aRef, bindingToRemove);
211
212 // We do not want to destroy the binding, so just forget it.
213 bindingToRemove.forget();
214 }
215 }
216
217 // Callback to enumerate over the bindings from this document and write them
218 // out to the cache.
219 static PLDHashOperator
220 WriteBinding(const nsACString &aKey, nsXBLPrototypeBinding *aProto, void* aClosure)
221 {
222 aProto->Write((nsIObjectOutputStream*)aClosure);
223
224 return PL_DHASH_NEXT;
225 }
226
227 // static
228 nsresult
229 nsXBLDocumentInfo::ReadPrototypeBindings(nsIURI* aURI, nsXBLDocumentInfo** aDocInfo)
230 {
231 *aDocInfo = nullptr;
232
233 nsAutoCString spec(kXBLCachePrefix);
234 nsresult rv = PathifyURI(aURI, spec);
235 NS_ENSURE_SUCCESS(rv, rv);
236
237 StartupCache* startupCache = StartupCache::GetSingleton();
238 NS_ENSURE_TRUE(startupCache, NS_ERROR_FAILURE);
239
240 nsAutoArrayPtr<char> buf;
241 uint32_t len;
242 rv = startupCache->GetBuffer(spec.get(), getter_Transfers(buf), &len);
243 // GetBuffer will fail if the binding is not in the cache.
244 if (NS_FAILED(rv))
245 return rv;
246
247 nsCOMPtr<nsIObjectInputStream> stream;
248 rv = NewObjectInputStreamFromBuffer(buf, len, getter_AddRefs(stream));
249 NS_ENSURE_SUCCESS(rv, rv);
250 buf.forget();
251
252 // The file compatibility.ini stores the build id. This is checked in
253 // nsAppRunner.cpp and will delete the cache if a different build is
254 // present. However, we check that the version matches here to be safe.
255 uint32_t version;
256 rv = stream->Read32(&version);
257 NS_ENSURE_SUCCESS(rv, rv);
258 if (version != XBLBinding_Serialize_Version) {
259 // The version that exists is different than expected, likely created with a
260 // different build, so invalidate the cache.
261 startupCache->InvalidateCache();
262 return NS_ERROR_NOT_AVAILABLE;
263 }
264
265 nsCOMPtr<nsIPrincipal> principal;
266 nsContentUtils::GetSecurityManager()->
267 GetSystemPrincipal(getter_AddRefs(principal));
268
269 nsCOMPtr<nsIDOMDocument> domdoc;
270 rv = NS_NewXBLDocument(getter_AddRefs(domdoc), aURI, nullptr, principal);
271 NS_ENSURE_SUCCESS(rv, rv);
272
273 nsCOMPtr<nsIDocument> doc = do_QueryInterface(domdoc);
274 NS_ASSERTION(doc, "Must have a document!");
275 nsRefPtr<nsXBLDocumentInfo> docInfo = new nsXBLDocumentInfo(doc);
276
277 while (1) {
278 uint8_t flags;
279 nsresult rv = stream->Read8(&flags);
280 NS_ENSURE_SUCCESS(rv, rv);
281 if (flags == XBLBinding_Serialize_NoMoreBindings)
282 break;
283
284 rv = nsXBLPrototypeBinding::ReadNewBinding(stream, docInfo, doc, flags);
285 if (NS_FAILED(rv)) {
286 return rv;
287 }
288 }
289
290 docInfo.swap(*aDocInfo);
291 return NS_OK;
292 }
293
294 nsresult
295 nsXBLDocumentInfo::WritePrototypeBindings()
296 {
297 // Only write out bindings with the system principal
298 if (!nsContentUtils::IsSystemPrincipal(mDocument->NodePrincipal()))
299 return NS_OK;
300
301 nsAutoCString spec(kXBLCachePrefix);
302 nsresult rv = PathifyURI(DocumentURI(), spec);
303 NS_ENSURE_SUCCESS(rv, rv);
304
305 StartupCache* startupCache = StartupCache::GetSingleton();
306 NS_ENSURE_TRUE(startupCache, rv);
307
308 nsCOMPtr<nsIObjectOutputStream> stream;
309 nsCOMPtr<nsIStorageStream> storageStream;
310 rv = NewObjectOutputWrappedStorageStream(getter_AddRefs(stream),
311 getter_AddRefs(storageStream),
312 true);
313 NS_ENSURE_SUCCESS(rv, rv);
314
315 rv = stream->Write32(XBLBinding_Serialize_Version);
316 NS_ENSURE_SUCCESS(rv, rv);
317
318 if (mBindingTable) {
319 mBindingTable->EnumerateRead(WriteBinding, stream);
320 }
321
322 // write a end marker at the end
323 rv = stream->Write8(XBLBinding_Serialize_NoMoreBindings);
324 NS_ENSURE_SUCCESS(rv, rv);
325
326 stream->Close();
327 NS_ENSURE_SUCCESS(rv, rv);
328
329 uint32_t len;
330 nsAutoArrayPtr<char> buf;
331 rv = NewBufferFromStorageStream(storageStream, getter_Transfers(buf), &len);
332 NS_ENSURE_SUCCESS(rv, rv);
333
334 return startupCache->PutBuffer(spec.get(), buf, len);
335 }
336
337 void
338 nsXBLDocumentInfo::SetFirstPrototypeBinding(nsXBLPrototypeBinding* aBinding)
339 {
340 mFirstBinding = aBinding;
341 }
342
343 static PLDHashOperator
344 FlushScopedSkinSheets(const nsACString &aKey, nsXBLPrototypeBinding *aProto, void* aClosure)
345 {
346 aProto->FlushSkinSheets();
347 return PL_DHASH_NEXT;
348 }
349
350 void
351 nsXBLDocumentInfo::FlushSkinStylesheets()
352 {
353 if (mBindingTable) {
354 mBindingTable->EnumerateRead(FlushScopedSkinSheets, nullptr);
355 }
356 }
357
358 #ifdef DEBUG
359 void
360 AssertInCompilationScope()
361 {
362 AutoJSContext cx;
363 // Note - Inverting the order of these operands is a rooting hazard.
364 MOZ_ASSERT(xpc::GetCompilationScope() == JS::CurrentGlobalOrNull(cx));
365 }
366 #endif

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