Bug 1182569 - Skip security check for plugins using newstream attribute

docshell/base/nsDocShell.cpp

@@ -13918,7 +13918,8 @@ public:
                    const nsAString& aFileName,
                    nsIInputStream* aPostDataStream,
                    nsIInputStream* aHeadersDataStream,
-                   bool aIsTrusted);
+                   bool aIsTrusted,
+                   nsIPrincipal* aTriggeringPrincipal);
 
   NS_IMETHOD Run() override
   {
@@ -13934,7 +13935,7 @@ public:
       mHandler->OnLinkClickSync(mContent, mURI,
                                 mTargetSpec.get(), mFileName,
                                 mPostDataStream, mHeadersDataStream,
-                                nullptr, nullptr);
+                                nullptr, nullptr, mTriggeringPrincipal);
     }
     return NS_OK;
   }
@@ -13949,6 +13950,7 @@ private:
   nsCOMPtr<nsIContent> mContent;
   PopupControlState mPopupState;
   bool mIsTrusted;
+  nsCOMPtr<nsIPrincipal> mTriggeringPrincipal;
 };
 
 OnLinkClickEvent::OnLinkClickEvent(nsDocShell* aHandler,
@@ -13958,7 +13960,8 @@ OnLinkClickEvent::OnLinkClickEvent(nsDocShell* aHandler,
                                    const nsAString& aFileName,
                                    nsIInputStream* aPostDataStream,
                                    nsIInputStream* aHeadersDataStream,
-                                   bool aIsTrusted)
+                                   bool aIsTrusted,
+                                   nsIPrincipal* aTriggeringPrincipal)
   : mHandler(aHandler)
   , mURI(aURI)
   , mTargetSpec(aTargetSpec)
@@ -13968,6 +13971,7 @@ OnLinkClickEvent::OnLinkClickEvent(nsDocShell* aHandler,
   , mContent(aContent)
   , mPopupState(mHandler->mScriptGlobal->GetPopupControlState())
   , mIsTrusted(aIsTrusted)
+  , mTriggeringPrincipal(aTriggeringPrincipal)
 {
 }
 
@@ -13978,7 +13982,8 @@ nsDocShell::OnLinkClick(nsIContent* aContent,
                         const nsAString& aFileName,
                         nsIInputStream* aPostDataStream,
                         nsIInputStream* aHeadersDataStream,
-                        bool aIsTrusted)
+                        bool aIsTrusted,
+                        nsIPrincipal* aTriggeringPrincipal)
 {
   NS_ASSERTION(NS_IsMainThread(), "wrong thread");
 
@@ -14017,7 +14022,8 @@ nsDocShell::OnLinkClick(nsIContent* aContent,
 
   nsCOMPtr<nsIRunnable> ev =
     new OnLinkClickEvent(this, aContent, aURI, target.get(), aFileName,
-                         aPostDataStream, aHeadersDataStream, aIsTrusted);
+                         aPostDataStream, aHeadersDataStream,
+                         aIsTrusted, aTriggeringPrincipal);
   return NS_DispatchToCurrentThread(ev);
 }
 
@@ -14029,7 +14035,8 @@ nsDocShell::OnLinkClickSync(nsIContent* aContent,
                             nsIInputStream* aPostDataStream,
                             nsIInputStream* aHeadersDataStream,
                             nsIDocShell** aDocShell,
-                            nsIRequest** aRequest)
+                            nsIRequest** aRequest,
+                            nsIPrincipal* aTriggeringPrincipal)
 {
   // Initialize the DocShell / Request
   if (aDocShell) {
@@ -14152,13 +14159,18 @@ nsDocShell::OnLinkClickSync(nsIContent* aContent,
     return NS_ERROR_OUT_OF_MEMORY;
   }
 
+  // if the triggeringPrincipal is not passed explicitly, then we
+  // fall back to using doc->NodePrincipal() as the triggeringPrincipal.
+  nsCOMPtr<nsIPrincipal> triggeringPrincipal =
+    aTriggeringPrincipal ? aTriggeringPrincipal
+                         : aContent->NodePrincipal();
+
   nsresult rv = InternalLoad(clonedURI,                 // New URI
                              nullptr,                   // Original URI
                              false,                     // LoadReplace
                              referer,                   // Referer URI
                              refererPolicy,             // Referer policy
-                             aContent->NodePrincipal(), // Triggering is our node's
+                             triggeringPrincipal,
-                                                        // principal
                              aContent->NodePrincipal(),
                              flags,
                              target,                    // Window target

docshell/base/nsDocShell.h

@@ -201,7 +201,8 @@ public:
                          const nsAString& aFileName,
                          nsIInputStream* aPostDataStream,
                          nsIInputStream* aHeadersDataStream,
-                         bool aIsTrusted) override;
+                         bool aIsTrusted,
+                         nsIPrincipal* aTriggeringPrincipal) override;
   NS_IMETHOD OnLinkClickSync(nsIContent* aContent,
                              nsIURI* aURI,
                              const char16_t* aTargetSpec,
@@ -209,7 +210,8 @@ public:
                              nsIInputStream* aPostDataStream = 0,
                              nsIInputStream* aHeadersDataStream = 0,
                              nsIDocShell** aDocShell = 0,
-                             nsIRequest** aRequest = 0) override;
+                             nsIRequest** aRequest = 0,
+                             nsIPrincipal* aTriggeringPrincipal = nullptr) override;
   NS_IMETHOD OnOverLink(nsIContent* aContent,
                         nsIURI* aURI,
                         const char16_t* aTargetSpec) override;

docshell/base/nsILinkHandler.h

@@ -37,6 +37,8 @@ public:
    * @param aFileName non-null when the link should be downloaded as the given file
    * @param aHeadersDataStream ???
    * @param aIsTrusted false if the triggerer is an untrusted DOM event.
+   * @param aTriggeringPrincipal, if not passed explicitly we fall back to
+   *        the document's principal.
    */
   NS_IMETHOD OnLinkClick(nsIContent* aContent,
                          nsIURI* aURI,
@@ -44,7 +46,8 @@ public:
                          const nsAString& aFileName,
                          nsIInputStream* aPostDataStream,
                          nsIInputStream* aHeadersDataStream,
-                         bool aIsTrusted) = 0;
+                         bool aIsTrusted,
+                         nsIPrincipal* aTriggeringPrincipal) = 0;
 
   /**
    * Process a click on a link.
@@ -61,6 +64,8 @@ public:
    * @param aHeadersDataStream ???
    * @param aDocShell (out-param) the DocShell that the request was opened on
    * @param aRequest the request that was opened
+   * @param aTriggeringPrincipal, if not passed explicitly we fall back to
+   *        the document's principal.
    */
   NS_IMETHOD OnLinkClickSync(nsIContent* aContent,
                              nsIURI* aURI,
@@ -69,7 +74,8 @@ public:
                              nsIInputStream* aPostDataStream = 0,
                              nsIInputStream* aHeadersDataStream = 0,
                              nsIDocShell** aDocShell = 0,
-                             nsIRequest** aRequest = 0) = 0;
+                             nsIRequest** aRequest = 0,
+                             nsIPrincipal* aTriggeringPrincipal = nullptr) = 0;
 
   /**
    * Process a mouse-over a link.

dom/base/nsContentUtils.cpp

@@ -5104,7 +5104,7 @@ nsContentUtils::TriggerLink(nsIContent *aContent, nsPresContext *aPresContext,
 
     handler->OnLinkClick(aContent, aLinkURI,
                          fileName.IsVoid() ? aTargetSpec.get() : EmptyString().get(),
-                         fileName, nullptr, nullptr, aIsTrusted);
+                         fileName, nullptr, nullptr, aIsTrusted, aContent->NodePrincipal());
   }
 }
 

dom/plugins/base/nsPluginInstanceOwner.cpp

@@ -535,16 +535,6 @@ NS_IMETHODIMP nsPluginInstanceOwner::GetURL(const char *aURL,
   nsresult rv = NS_NewURI(getter_AddRefs(uri), aURL, baseURI);
   NS_ENSURE_SUCCESS(rv, NS_ERROR_FAILURE);
 
-  if (aDoCheckLoadURIChecks) {
-    nsCOMPtr<nsIScriptSecurityManager> secMan(
-      do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID, &rv));
-    NS_ENSURE_TRUE(secMan, NS_ERROR_FAILURE);
-
-    rv = secMan->CheckLoadURIWithPrincipal(content->NodePrincipal(), uri,
-                                           nsIScriptSecurityManager::STANDARD);
-    NS_ENSURE_SUCCESS(rv, rv);
-  }
-
   nsCOMPtr<nsIInputStream> headersDataStream;
   if (aPostStream && aHeadersData) {
     if (!aHeadersDataLen)
@@ -563,8 +553,21 @@ NS_IMETHODIMP nsPluginInstanceOwner::GetURL(const char *aURL,
     Preferences::GetInt("privacy.popups.disable_from_plugins");
   nsAutoPopupStatePusher popupStatePusher((PopupControlState)blockPopups);
 
+
+  // if security checks (in particular CheckLoadURIWithPrincipal) needs
+  // to be skipped we are creating a codebasePrincipal to make sure
+  // that security check succeeds. Please note that we do not want to
+  // fall back to using the systemPrincipal, because that would also
+  // bypass ContentPolicy checks which should still be enforced.
+  nsCOMPtr<nsIPrincipal> triggeringPrincipal;
+  if (!aDoCheckLoadURIChecks) {
+    mozilla::PrincipalOriginAttributes attrs =
+      BasePrincipal::Cast(content->NodePrincipal())->OriginAttributesRef();
+    triggeringPrincipal = BasePrincipal::CreateCodebasePrincipal(uri, attrs);
+  }
+
   rv = lh->OnLinkClick(content, uri, unitarget.get(), NullString(),
-                       aPostStream, headersDataStream, true);
+                       aPostStream, headersDataStream, true, triggeringPrincipal);
 
   return rv;
 }