dom/security/DOMSecurityMonitor.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 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 file,
   5  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "DOMSecurityMonitor.h"
   8 #include "nsContentUtils.h"
   9
  10 #include "nsIChannel.h"
  11 #include "nsILoadInfo.h"
  12 #include "nsIPrincipal.h"
  13 #include "nsIURI.h"
  14 #include "nsJSUtils.h"
  15 #include "xpcpublic.h"
  16
  17 #include "mozilla/BasePrincipal.h"
  18 #include "mozilla/StaticPrefs_dom.h"
  19
  20 /* static */
  21 void DOMSecurityMonitor::AuditParsingOfHTMLXMLFragments(
  22     nsIPrincipal* aPrincipal, const nsAString& aFragment) {
  23   // if the fragment parser (e.g. innerHTML()) is not called in chrome: code
  24   // or any of our about: pages, then there is nothing to do here.
  25   if (!aPrincipal->IsSystemPrincipal() && !aPrincipal->SchemeIs("about")) {
  26     return;
  27   }
  28
  29   // check if the fragment is empty, if so, we can return early.
  30   if (aFragment.IsEmpty()) {
  31     return;
  32   }
  33
  34   // check if there is a JS caller, if not, then we can can return early here
  35   // because we only care about calls to the fragment parser (e.g. innerHTML)
  36   // originating from JS code.
  37   auto loc = mozilla::JSCallingLocation::Get();
  38   if (!loc) {
  39     return;
  40   }
  41
  42   // check if we should skip assertion. Please only ever set this pref to
  43   // true if really needed for testing purposes.
  44   if (mozilla::StaticPrefs::dom_security_skip_html_fragment_assertion()) {
  45     return;
  46   }
  47
  48   /*
  49    * WARNING: Do not add any new entries to the htmlFragmentAllowlist
  50    * without proper review from a dom:security peer!
  51    */
  52   static nsLiteralCString htmlFragmentAllowlist[] = {
  53       "chrome://global/content/elements/marquee.js"_ns,
  54       nsLiteralCString(
  55           "chrome://pocket/content/panels/js/vendor/jquery-2.1.1.min.js"),
  56       nsLiteralCString("chrome://devtools/content/shared/sourceeditor/"
  57                        "codemirror/codemirror.bundle.js"),
  58       nsLiteralCString(
  59           "resource://activity-stream/data/content/activity-stream.bundle.js"),
  60       nsLiteralCString("resource://devtools/client/debugger/src/components/"
  61                        "Editor/Breakpoint.js"),
  62       nsLiteralCString("resource://devtools/client/debugger/src/components/"
  63                        "Editor/ColumnBreakpoint.js"),
  64       nsLiteralCString(
  65           "resource://devtools/client/shared/vendor/fluent-react.js"),
  66       "resource://devtools/client/shared/vendor/react-dom.js"_ns,
  67       nsLiteralCString(
  68           "resource://devtools/client/shared/vendor/react-dom-dev.js"),
  69       nsLiteralCString(
  70           "resource://devtools/client/shared/widgets/FilterWidget.js"),
  71       nsLiteralCString("resource://devtools/client/shared/widgets/tooltip/"
  72                        "inactive-css-tooltip-helper.js"),
  73       "resource://devtools/client/shared/widgets/Spectrum.js"_ns,
  74       "resource://gre/modules/narrate/VoiceSelect.sys.mjs"_ns,
  75       "chrome://global/content/vendor/react-dom.js"_ns,
  76       // ------------------------------------------------------------------
  77       // test pages
  78       // ------------------------------------------------------------------
  79       "chrome://mochikit/content/browser-harness.xhtml"_ns,
  80       "chrome://mochikit/content/harness.xhtml"_ns,
  81       "chrome://mochikit/content/tests/"_ns,
  82       "chrome://mochitests/content/"_ns,
  83       "chrome://reftest/content/"_ns,
  84   };
  85
  86   for (const nsLiteralCString& allowlistEntry : htmlFragmentAllowlist) {
  87     if (StringBeginsWith(loc.FileName(), allowlistEntry)) {
  88       return;
  89     }
  90   }
  91
  92   nsAutoCString uriSpec;
  93   aPrincipal->GetAsciiSpec(uriSpec);
  94
  95   // Ideally we should not call the fragment parser (e.g. innerHTML()) in
  96   // chrome: code or any of our about: pages. If you hit that assertion,
  97   // please do *not* add your filename to the allowlist above, but rather
  98   // refactor your code.
  99   fprintf(stderr,
 100           "Do not call the fragment parser (e.g innerHTML()) in chrome code "
 101           "or in about: pages, (uri: %s), (caller: %s, line: %d, col: %d), "
 102           "(fragment: %s)",
 103           uriSpec.get(), loc.FileName().get(), loc.mLine, loc.mColumn,
 104           NS_ConvertUTF16toUTF8(aFragment).get());
 105
 106   xpc_DumpJSStack(true, true, false);
 107   MOZ_ASSERT(false);
 108 }
 109
 110 /* static */
 111 void DOMSecurityMonitor::AuditUseOfJavaScriptURI(nsIChannel* aChannel) {
 112   nsCOMPtr<nsILoadInfo> loadInfo = aChannel->LoadInfo();
 113   nsCOMPtr<nsIPrincipal> loadingPrincipal = loadInfo->GetLoadingPrincipal();
 114
 115   // We only ever have no loadingPrincipal in case of a new top-level load.
 116   // The purpose of this assertion is to make sure we do not allow loading
 117   // javascript: URIs in system privileged contexts. Hence there is nothing
 118   // to do here in case there is no loadingPrincipal.
 119   if (!loadingPrincipal) {
 120     return;
 121   }
 122
 123   // if the javascript: URI is not loaded by a system privileged context
 124   // or an about: page, there there is nothing to do here.
 125   if (!loadingPrincipal->IsSystemPrincipal() &&
 126       !loadingPrincipal->SchemeIs("about")) {
 127     return;
 128   }
 129
 130   MOZ_ASSERT(false,
 131              "Do not use javascript: URIs in chrome code or in about: pages");
 132 }