Bug 406541 - Ensure we agree with java on applet codebase, and run security checks for file: codebase URIs. r=jst

content/base/public/nsIObjectLoadingContent.idl

@@ -42,6 +42,7 @@ interface nsIObjectFrame;
 interface nsIPluginTag;
 interface nsIDOMElement;
 interface nsIDOMClientRect;
+interface nsIURI;
 
 %{C++
 #include "nsNPAPIPluginInstance.h"
@@ -51,7 +52,7 @@ interface nsIDOMClientRect;
 /**
  * This interface represents a content node that loads objects.
  */
-[scriptable, uuid(6D8914C7-0E22-4452-8962-11B69BBE84D7)]
+[scriptable, uuid(3FF07AB3-5BAC-4D98-9549-5BD15CCEBCD3)]
 interface nsIObjectLoadingContent : nsISupports
 {
   const unsigned long TYPE_LOADING  = 0;
@@ -79,6 +80,14 @@ interface nsIObjectLoadingContent : nsISupports
    */
   unsigned long getContentTypeForMIMEType(in AUTF8String aMimeType);
 
+  /**
+  * Gets the base URI to be used for this object. This differs from
+  * nsIContent::GetBaseURI in that it takes codebase attributes into
+  * account. The MIME type is required as some plugins (java) calculate
+  * this differently.
+  */
+  nsIURI GetObjectBaseURI(in ACString aMimeType);
+
   /**
    * Returns the plugin instance if it has already been instantiated. This
    * will never instantiate the plugin and so is safe to call even when

content/base/src/nsObjectLoadingContent.cpp

@@ -598,7 +598,7 @@ nsObjectLoadingContent::InstantiatePluginInstance(const char* aMimeType, nsIURI*
   if (!aURI) {
     // We need some URI. If we have nothing else, use the base URI.
     // XXX(biesi): The code used to do this. Not sure why this is correct...
-    GetObjectBaseURI(thisContent, getter_AddRefs(baseURI));
+    GetObjectBaseURI(nsCString(aMimeType), getter_AddRefs(baseURI));
     aURI = baseURI;
   }
 
@@ -1163,7 +1163,7 @@ nsObjectLoadingContent::LoadObject(const nsAString& aURI,
 
   nsIDocument* doc = thisContent->OwnerDoc();
   nsCOMPtr<nsIURI> baseURI;
-  GetObjectBaseURI(thisContent, getter_AddRefs(baseURI));
+  GetObjectBaseURI(aTypeHint, getter_AddRefs(baseURI));
 
   nsCOMPtr<nsIURI> uri;
   nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(uri),
@@ -1194,6 +1194,51 @@ nsObjectLoadingContent::UpdateFallbackState(nsIContent* aContent,
   }
 }
 
+bool
+nsObjectLoadingContent::IsFileCodebaseAllowable(nsIURI* aBaseURI, nsIURI* aOriginURI)
+{
+  nsCOMPtr<nsIFileURL> baseFileURL(do_QueryInterface(aBaseURI));
+  nsCOMPtr<nsIFileURL> originFileURL(do_QueryInterface(aOriginURI));
+
+  // get IFile handles and normalize
+  nsCOMPtr<nsIFile> originFile;
+  nsCOMPtr<nsIFile> baseFile;
+  if (!originFileURL || !baseFileURL ||
+      NS_FAILED(originFileURL->GetFile(getter_AddRefs(originFile))) ||
+      NS_FAILED(baseFileURL->GetFile(getter_AddRefs(baseFile))) ||
+      NS_FAILED(baseFile->Normalize()) ||
+      NS_FAILED(originFile->Normalize())) {
+    return false;
+  }
+
+  // If the origin is a directory, it should contain/equal baseURI
+  // Otherwise, its parent directory should contain/equal baseURI
+  bool origin_is_dir;
+  bool contained = false;
+  nsresult rv = originFile->IsDirectory(&origin_is_dir);
+  NS_ENSURE_SUCCESS(rv, false);
+
+  if (origin_is_dir) {
+    // originURI is a directory, ensure it contains the baseURI
+    rv = originFile->Contains(baseFile, true, &contained);
+    if (NS_SUCCEEDED(rv) && !contained) {
+      rv = originFile->Equals(baseFile, &contained);
+    }
+  } else {
+    // originURI is a file, ensure its parent contains the baseURI
+    nsCOMPtr<nsIFile> originParent;
+    rv = originFile->GetParent(getter_AddRefs(originParent));
+    if (NS_SUCCEEDED(rv) && originParent) {
+      rv = originParent->Contains(baseFile, true, &contained);
+      if (NS_SUCCEEDED(rv) && !contained) {
+        rv = originParent->Equals(baseFile, &contained);
+      }
+    }
+  }
+
+  return NS_SUCCEEDED(rv) && contained;
+}
+
 nsresult
 nsObjectLoadingContent::LoadObject(nsIURI* aURI,
                                    bool aNotify,
@@ -1291,6 +1336,28 @@ nsObjectLoadingContent::LoadObject(nsIURI* aURI,
       HandleBeingBlockedByContentPolicy(rv, shouldLoad);
       return NS_OK;
     }
+
+    // If this is a file:// URI, require that the codebase (baseURI)
+    // is contained within the same folder as the document origin (originURI)
+    // or within the document origin, if it is a folder.
+    // No originURI implies chrome, which bypasses the check
+    // -- bug 406541
+    nsCOMPtr<nsIURI> originURI;
+    nsCOMPtr<nsIURI> baseURI;
+    GetObjectBaseURI(aTypeHint, getter_AddRefs(baseURI));
+    rv = thisContent->NodePrincipal()->GetURI(getter_AddRefs(originURI));
+    if (NS_FAILED(rv)) {
+      Fallback(aNotify);
+      return NS_OK;
+    }
+    if (originURI) {
+      bool isfile;
+      if (NS_FAILED(originURI->SchemeIs("file", &isfile)) ||
+          (isfile && !IsFileCodebaseAllowable(baseURI, originURI))) {
+        Fallback(aNotify);
+        return NS_OK;
+      }
+    }
   }
 
   nsresult rv = NS_ERROR_UNEXPECTED;
@@ -1408,7 +1475,7 @@ nsObjectLoadingContent::LoadObject(nsIURI* aURI,
       // XXX(biesi). The plugin instantiation code used to pass the base URI
       // here instead of the plugin URI for instantiation via class ID, so I
       // continue to do so. Why that is, no idea...
-      GetObjectBaseURI(thisContent, getter_AddRefs(mURI));
+      GetObjectBaseURI(mContentType, getter_AddRefs(mURI));
       if (!mURI) {
         mURI = aURI;
       }
@@ -1785,25 +1852,29 @@ nsObjectLoadingContent::TypeForClassID(const nsAString& aClassID,
   return NS_ERROR_NOT_AVAILABLE;
 }
 
-void
-nsObjectLoadingContent::GetObjectBaseURI(nsIContent* thisContent, nsIURI** aURI)
+NS_IMETHODIMP
+nsObjectLoadingContent::GetObjectBaseURI(const nsACString & aMimeType, nsIURI** aURI)
 {
-  // We want to use swap(); since this is just called from this file,
-  // we can assert this (callers use comptrs)
-  NS_PRECONDITION(*aURI == nsnull, "URI must be inited to zero");
+  nsCOMPtr<nsIContent> thisContent =
+    do_QueryInterface(static_cast<nsIImageLoadingContent*>(this));
 
   // For plugins, the codebase attribute is the base URI
   nsCOMPtr<nsIURI> baseURI = thisContent->GetBaseURI();
   nsAutoString codebase;
   thisContent->GetAttr(kNameSpaceID_None, nsGkAtoms::codebase,
                        codebase);
-  if (!codebase.IsEmpty()) {
-    nsContentUtils::NewURIWithDocumentCharset(aURI, codebase,
-                                              thisContent->OwnerDoc(),
-                                              baseURI);
-  } else {
-    baseURI.swap(*aURI);
+
+  if (codebase.IsEmpty() && aMimeType.Equals("application/x-java-vm")) {
+    // bug 406541
+    // Java resolves codebase="" as "/" -- so we replicate that quirk, to ensure
+    // we run security checks against the same path.
+    codebase.AssignLiteral("/");
   }
+
+  nsContentUtils::NewURIWithDocumentCharset(aURI, codebase,
+                                            thisContent->OwnerDoc(),
+                                            baseURI);
+  return NS_OK;
 }
 
 nsObjectFrame*

content/base/src/nsObjectLoadingContent.h

@@ -253,6 +253,12 @@ class nsObjectLoadingContent : public nsImageLoadingContent
      */
     static bool IsSuccessfulRequest(nsIRequest* aRequest);
 
+    /**
+     * Check if the given baseURI is contained in the same directory as the
+     * aOriginURI (or a child thereof)
+     */
+    static bool IsFileCodebaseAllowable(nsIURI* aBaseURI, nsIURI* aOriginURI);
+
     /**
      * Check whether the URI can be handled internally.
      */
@@ -299,14 +305,6 @@ class nsObjectLoadingContent : public nsImageLoadingContent
      */
     nsresult TypeForClassID(const nsAString& aClassID, nsACString& aType);
 
-    /**
-     * Gets the base URI to be used for this object. This differs from
-     * nsIContent::GetBaseURI in that it takes codebase attributes into
-     * account.
-     */
-    void GetObjectBaseURI(nsIContent* thisContent, nsIURI** aURI);
-
-
     /**
      * Gets the frame that's associated with this content node.
      * Does not flush.

dom/plugins/base/nsPluginInstanceOwner.cpp

@@ -95,6 +95,7 @@ using mozilla::DefaultXDisplay;
 #include "nsIDOMDragEvent.h"
 #include "nsIScrollableFrame.h"
 #include "nsIImageLoadingContent.h"
+#include "nsIObjectLoadingContent.h"
 
 #include "nsContentCID.h"
 #include "nsWidgetsCID.h"
@@ -1195,6 +1196,31 @@ nsresult nsPluginInstanceOwner::EnsureCachedAttrParamArrays()
     mNumCachedAttrs++;
   }
 
+  // Some plugins (java, bug 406541) don't canonicalize the 'codebase' attribute
+  // in a standard way - codebase="" results in / (domain root), but
+  // codebase="blah" results in ./blah; codebase="file:" results in "file:///".
+  // We canonicalize codebase here to ensure the codebase we run security checks
+  // against is the same codebase java uses.
+  // Note that GetObjectBaseURI mimics some of java's quirks for maximal
+  // compatibility.
+  const char* mime = nsnull;
+  bool addCodebase = false;
+  nsCAutoString codebaseSpec;
+  if (mInstance && NS_SUCCEEDED(mInstance->GetMIMEType(&mime)) && mime &&
+      strcmp(mime, "application/x-java-vm") == 0) {
+    addCodebase = true;
+    nsCOMPtr<nsIObjectLoadingContent> objlContent = do_QueryInterface(mContent);
+    nsCOMPtr<nsIURI> codebaseURI;
+    objlContent->GetObjectBaseURI(nsCString(mime), getter_AddRefs(codebaseURI));
+    nsresult rv = codebaseURI->GetSpec(codebaseSpec);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    // Make space if codebase isn't already set
+    if (!mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::codebase)) {
+      mNumCachedAttrs++;
+    }
+  }
+
   mCachedAttrParamNames  = (char**)NS_Alloc(sizeof(char*) * (mNumCachedAttrs + 1 + mNumCachedParams));
   NS_ENSURE_TRUE(mCachedAttrParamNames,  NS_ERROR_OUT_OF_MEMORY);
   mCachedAttrParamValues = (char**)NS_Alloc(sizeof(char*) * (mNumCachedAttrs + 1 + mNumCachedParams));
@@ -1248,12 +1274,22 @@ nsresult nsPluginInstanceOwner::EnsureCachedAttrParamArrays()
         mNumCachedAttrs--;
         wmodeSet = true;
       }
+    } else if (addCodebase && 0 == PL_strcasecmp(mCachedAttrParamNames[nextAttrParamIndex], "codebase")) {
+      mCachedAttrParamValues[nextAttrParamIndex] = ToNewUTF8String(NS_ConvertUTF8toUTF16(codebaseSpec));
+      addCodebase = false;
     } else {
       mCachedAttrParamValues[nextAttrParamIndex] = ToNewUTF8String(value);
     }
     nextAttrParamIndex++;
   }
 
+  // Pontentially add CODEBASE attribute
+  if (addCodebase) {
+    mCachedAttrParamNames [nextAttrParamIndex] = ToNewUTF8String(NS_LITERAL_STRING("codebase"));
+    mCachedAttrParamValues[nextAttrParamIndex] = ToNewUTF8String(NS_ConvertUTF8toUTF16(codebaseSpec));
+    nextAttrParamIndex++;
+  }
+
   // Potentially add WMODE attribute.
   if (!wmodeType.IsEmpty() && !wmodeSet) {
     mCachedAttrParamNames [nextAttrParamIndex] = ToNewUTF8String(NS_LITERAL_STRING("wmode"));