Line data    Source code

       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
       5             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       6             : 
       7             : #include "FileSystemSecurity.h"
       8             : #include "FileSystemUtils.h"
       9             : #include "mozilla/ClearOnShutdown.h"
      10             : #include "mozilla/StaticPtr.h"
      11             : 
      12             : namespace mozilla {
      13             : namespace dom {
      14             : 
      15             : namespace {
      16             : 
      17           3 : StaticRefPtr<FileSystemSecurity> gFileSystemSecurity;
      18             : 
      19             : } // anonymous
      20             : 
      21             : /* static */ already_AddRefed<FileSystemSecurity>
      22           0 : FileSystemSecurity::Get()
      23             : {
      24           0 :   MOZ_ASSERT(NS_IsMainThread());
      25           0 :   AssertIsInMainProcess();
      26             : 
      27           0 :   RefPtr<FileSystemSecurity> service = gFileSystemSecurity.get();
      28           0 :   return service.forget();
      29             : }
      30             : 
      31             : /* static */ already_AddRefed<FileSystemSecurity>
      32           0 : FileSystemSecurity::GetOrCreate()
      33             : {
      34           0 :   MOZ_ASSERT(NS_IsMainThread());
      35           0 :   AssertIsInMainProcess();
      36             : 
      37           0 :   if (!gFileSystemSecurity) {
      38           0 :     gFileSystemSecurity = new FileSystemSecurity();
      39           0 :     ClearOnShutdown(&gFileSystemSecurity);
      40             :   }
      41             : 
      42           0 :   RefPtr<FileSystemSecurity> service = gFileSystemSecurity.get();
      43           0 :   return service.forget();
      44             : }
      45             : 
      46           0 : FileSystemSecurity::FileSystemSecurity()
      47             : {
      48           0 :   MOZ_ASSERT(NS_IsMainThread());
      49           0 :   AssertIsInMainProcess();
      50           0 : }
      51             : 
      52           0 : FileSystemSecurity::~FileSystemSecurity()
      53             : {
      54           0 :   MOZ_ASSERT(NS_IsMainThread());
      55           0 :   AssertIsInMainProcess();
      56           0 : }
      57             : 
      58             : void
      59           0 : FileSystemSecurity::GrantAccessToContentProcess(ContentParentId aId,
      60             :                                                 const nsAString& aDirectoryPath)
      61             : {
      62           0 :   MOZ_ASSERT(NS_IsMainThread());
      63           0 :   AssertIsInMainProcess();
      64             : 
      65             :   nsTArray<nsString>* paths;
      66           0 :   if (!mPaths.Get(aId, &paths)) {
      67           0 :     paths = new nsTArray<nsString>();
      68           0 :     mPaths.Put(aId, paths);
      69           0 :   } else if (paths->Contains(aDirectoryPath)) {
      70           0 :     return;
      71             :   }
      72             : 
      73           0 :   paths->AppendElement(aDirectoryPath);
      74             : }
      75             : 
      76             : void
      77           0 : FileSystemSecurity::Forget(ContentParentId aId)
      78             : {
      79           0 :   MOZ_ASSERT(NS_IsMainThread());
      80           0 :   AssertIsInMainProcess();
      81             : 
      82           0 :   mPaths.Remove(aId);
      83           0 : }
      84             : 
      85             : bool
      86           0 : FileSystemSecurity::ContentProcessHasAccessTo(ContentParentId aId,
      87             :                                               const nsAString& aPath)
      88             : {
      89           0 :   MOZ_ASSERT(NS_IsMainThread());
      90           0 :   AssertIsInMainProcess();
      91             : 
      92             : #if defined(XP_WIN)
      93             :   if (StringBeginsWith(aPath, NS_LITERAL_STRING("..\\")) ||
      94             :       FindInReadable(NS_LITERAL_STRING("\\..\\"), aPath)) {
      95             :     return false;
      96             :   }
      97             : #elif defined(XP_UNIX)
      98           0 :   if (StringBeginsWith(aPath, NS_LITERAL_STRING("../")) ||
      99           0 :       FindInReadable(NS_LITERAL_STRING("/../"), aPath)) {
     100           0 :     return false;
     101             :   }
     102             : #endif
     103             : 
     104             :   nsTArray<nsString>* paths;
     105           0 :   if (!mPaths.Get(aId, &paths)) {
     106           0 :     return false;
     107             :   }
     108             : 
     109           0 :   for (uint32_t i = 0, len = paths->Length(); i < len; ++i) {
     110           0 :     if (FileSystemUtils::IsDescendantPath(paths->ElementAt(i), aPath)) {
     111           0 :       return true;
     112             :     }
     113             :   }
     114             : 
     115           0 :   return false;
     116             : }
     117             : 
     118             : } // dom namespace
     119             : } // mozilla namespace