1 files changed, 86 insertions, 0 deletions
diff --git a/dom/base/nsNoDataProtocolContentPolicy.cpp b/dom/base/nsNoDataProtocolContentPolicy.cpp
new file mode 100644
index 000000000..cd1484a22
--- /dev/null
+++ b/dom/base/nsNoDataProtocolContentPolicy.cpp
@@ -0,0 +1,86 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * Content policy implementation that prevents all loads of images,
+ * subframes, etc from protocols that don't return data but rather open
+ * applications (such as mailto).
+ */
+
+#include "nsNoDataProtocolContentPolicy.h"
+#include "nsIDOMWindow.h"
+#include "nsString.h"
+#include "nsIProtocolHandler.h"
+#include "nsIIOService.h"
+#include "nsIExternalProtocolHandler.h"
+#include "nsIURI.h"
+#include "nsNetUtil.h"
+#include "nsContentUtils.h"
+
+NS_IMPL_ISUPPORTS(nsNoDataProtocolContentPolicy, nsIContentPolicy)
+
+NS_IMETHODIMP
+nsNoDataProtocolContentPolicy::ShouldLoad(uint32_t aContentType,
+                                          nsIURI *aContentLocation,
+                                          nsIURI *aRequestingLocation,
+                                          nsISupports *aRequestingContext,
+                                          const nsACString &aMimeGuess,
+                                          nsISupports *aExtra,
+                                          nsIPrincipal *aRequestPrincipal,
+                                          int16_t *aDecision)
+{
+  MOZ_ASSERT(aContentType == nsContentUtils::InternalContentPolicyTypeToExternal(aContentType),
+             "We should only see external content policy types here.");
+
+  *aDecision = nsIContentPolicy::ACCEPT;
+
+  // Don't block for TYPE_OBJECT since such URIs are sometimes loaded by the
+  // plugin, so they don't necessarily open external apps
+  // TYPE_WEBSOCKET loads can only go to ws:// or wss://, so we don't need to
+  // concern ourselves with them.
+  if (aContentType != TYPE_DOCUMENT &&
+      aContentType != TYPE_SUBDOCUMENT &&
+      aContentType != TYPE_OBJECT &&
+      aContentType != TYPE_WEBSOCKET) {
+
+    // The following are just quick-escapes for the most common cases
+    // where we would allow the content to be loaded anyway.
+    nsAutoCString scheme;
+    aContentLocation->GetScheme(scheme);
+    if (scheme.EqualsLiteral("http") ||
+        scheme.EqualsLiteral("https") ||
+        scheme.EqualsLiteral("ftp") ||
+        scheme.EqualsLiteral("file") ||
+        scheme.EqualsLiteral("chrome")) {
+      return NS_OK;
+    }
+
+    bool shouldBlock;
+    nsresult rv = NS_URIChainHasFlags(aContentLocation,
+                                      nsIProtocolHandler::URI_DOES_NOT_RETURN_DATA,
+                                      &shouldBlock);
+    if (NS_SUCCEEDED(rv) && shouldBlock) {
+      *aDecision = nsIContentPolicy::REJECT_REQUEST;
+    }
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNoDataProtocolContentPolicy::ShouldProcess(uint32_t aContentType,
+                                             nsIURI *aContentLocation,
+                                             nsIURI *aRequestingLocation,
+                                             nsISupports *aRequestingContext,
+                                             const nsACString &aMimeGuess,
+                                             nsISupports *aExtra,
+                                             nsIPrincipal *aRequestPrincipal,
+                                             int16_t *aDecision)
+{
+  return ShouldLoad(aContentType, aContentLocation, aRequestingLocation,
+                    aRequestingContext, aMimeGuess, aExtra, aRequestPrincipal,
+                    aDecision);
+}