content/public/browser/child_process_security_policy.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_PUBLIC_BROWSER_CHILD_PROCESS_SECURITY_POLICY_H_
   6 #define CONTENT_PUBLIC_BROWSER_CHILD_PROCESS_SECURITY_POLICY_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "content/common/content_export.h"
  12
  13 namespace base {
  14 class FilePath;
  15 }
  16
  17 namespace content {
  18
  19 // The ChildProcessSecurityPolicy class is used to grant and revoke security
  20 // capabilities for child processes.  For example, it restricts whether a child
  21 // process is permitted to load file:// URLs based on whether the process
  22 // has ever been commanded to load file:// URLs by the browser.
  23 //
  24 // ChildProcessSecurityPolicy is a singleton that may be used on any thread.
  25 //
  26 class ChildProcessSecurityPolicy {
  27  public:
  28   virtual ~ChildProcessSecurityPolicy() {}
  29
  30   // There is one global ChildProcessSecurityPolicy object for the entire
  31   // browser process.  The object returned by this method may be accessed on
  32   // any thread.
  33   static CONTENT_EXPORT ChildProcessSecurityPolicy* GetInstance();
  34
  35   // Web-safe schemes can be requested by any child process.  Once a web-safe
  36   // scheme has been registered, any child process can request URLs with
  37   // that scheme.  There is no mechanism for revoking web-safe schemes.
  38   virtual void RegisterWebSafeScheme(const std::string& scheme) = 0;
  39
  40   // Returns true iff |scheme| has been registered as a web-safe scheme.
  41   virtual bool IsWebSafeScheme(const std::string& scheme) = 0;
  42
  43   // This permission grants only read access to a file.
  44   // Whenever the user picks a file from a <input type="file"> element, the
  45   // browser should call this function to grant the child process the capability
  46   // to upload the file to the web. Grants FILE_PERMISSION_READ_ONLY.
  47   virtual void GrantReadFile(int child_id, const base::FilePath& file) = 0;
  48
  49   // This permission grants creation, read, and full write access to a file,
  50   // including attributes.
  51   virtual void GrantCreateReadWriteFile(int child_id,
  52                                         const base::FilePath& file) = 0;
  53
  54   // This permission grants copy-into permission for |dir|.
  55   virtual void GrantCopyInto(int child_id, const base::FilePath& dir) = 0;
  56
  57   // This permission grants delete permission for |dir|.
  58   virtual void GrantDeleteFrom(int child_id, const base::FilePath& dir) = 0;
  59
  60   // These methods verify whether or not the child process has been granted
  61   // permissions perform these functions on |file|.
  62
  63   // Before servicing a child process's request to upload a file to the web, the
  64   // browser should call this method to determine whether the process has the
  65   // capability to upload the requested file.
  66   virtual bool CanReadFile(int child_id, const base::FilePath& file) = 0;
  67   virtual bool CanCreateReadWriteFile(int child_id,
  68                                       const base::FilePath& file) = 0;
  69
  70   // Grants read access permission to the given isolated file system
  71   // identified by |filesystem_id|. An isolated file system can be
  72   // created for a set of native files/directories (like dropped files)
  73   // using fileapi::IsolatedContext. A child process needs to be granted
  74   // permission to the file system to access the files in it using
  75   // file system URL. You do NOT need to give direct permission to
  76   // individual file paths.
  77   //
  78   // Note: files/directories in the same file system share the same
  79   // permission as far as they are accessed via the file system, i.e.
  80   // using the file system URL (tip: you can create a new file system
  81   // to give different permission to part of files).
  82   virtual void GrantReadFileSystem(int child_id,
  83                                    const std::string& filesystem_id) = 0;
  84
  85   // Grants write access permission to the given isolated file system
  86   // identified by |filesystem_id|.  See comments for GrantReadFileSystem
  87   // for more details.  You do NOT need to give direct permission to
  88   // individual file paths.
  89   //
  90   // This must be called with a great care as this gives write permission
  91   // to all files/directories included in the file system.
  92   virtual void GrantWriteFileSystem(int child_id,
  93                                     const std::string& filesystem_id) = 0;
  94
  95   // Grants create file permission to the given isolated file system
  96   // identified by |filesystem_id|.  See comments for GrantReadFileSystem
  97   // for more details.  You do NOT need to give direct permission to
  98   // individual file paths.
  99   //
 100   // This must be called with a great care as this gives create permission
 101   // within all directories included in the file system.
 102   virtual void GrantCreateFileForFileSystem(
 103       int child_id,
 104       const std::string& filesystem_id) = 0;
 105
 106   // Grants create, read and write access permissions to the given isolated
 107   // file system identified by |filesystem_id|.  See comments for
 108   // GrantReadFileSystem for more details.  You do NOT need to give direct
 109   // permission to individual file paths.
 110   //
 111   // This must be called with a great care as this gives create, read and write
 112   // permissions to all files/directories included in the file system.
 113   virtual void GrantCreateReadWriteFileSystem(
 114       int child_id,
 115       const std::string& filesystem_id) = 0;
 116
 117   // Grants permission to copy-into filesystem |filesystem_id|. 'copy-into'
 118   // is used to allow copying files into the destination filesystem without
 119   // granting more general create and write permissions.
 120   virtual void GrantCopyIntoFileSystem(int child_id,
 121                                        const std::string& filesystem_id) = 0;
 122
 123   // Grants permission to delete from filesystem |filesystem_id|. 'delete-from'
 124   // is used to allow deleting files into the destination filesystem without
 125   // granting more general create and write permissions.
 126   virtual void GrantDeleteFromFileSystem(int child_id,
 127                                          const std::string& filesystem_id) = 0;
 128
 129   // Grants the child process the capability to access URLs of the provided
 130   // scheme.
 131   virtual void GrantScheme(int child_id, const std::string& scheme) = 0;
 132
 133   // Returns true if read access has been granted to |filesystem_id|.
 134   virtual bool CanReadFileSystem(int child_id,
 135                                  const std::string& filesystem_id) = 0;
 136
 137   // Returns true if read and write access has been granted to |filesystem_id|.
 138   virtual bool CanReadWriteFileSystem(int child_id,
 139                                       const std::string& filesystem_id) = 0;
 140
 141   // Returns true if copy-into access has been granted to |filesystem_id|.
 142   virtual bool CanCopyIntoFileSystem(int child_id,
 143                                      const std::string& filesystem_id) = 0;
 144
 145   // Returns true if delete-from access has been granted to |filesystem_id|.
 146   virtual bool CanDeleteFromFileSystem(int child_id,
 147                                        const std::string& filesystem_id) = 0;
 148 };
 149
 150 }  // namespace content
 151
 152 #endif  // CONTENT_PUBLIC_BROWSER_CHILD_PROCESS_SECURITY_POLICY_H_