child_process_security_policy.h revision 8bcbed890bc3ce4d7a057a8f32cab53fa534672e 
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
13namespace base {
14class FilePath;
15}
16
17namespace 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//
26class 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  // These methods verify whether or not the child process has been granted
55  // permissions perform these functions on |file|.
56
57  // Before servicing a child process's request to upload a file to the web, the
58  // browser should call this method to determine whether the process has the
59  // capability to upload the requested file.
60  virtual bool CanReadFile(int child_id, const base::FilePath& file) = 0;
61  virtual bool CanCreateReadWriteFile(int child_id,
62                                      const base::FilePath& file) = 0;
63
64  // Grants read access permission to the given isolated file system
65  // identified by |filesystem_id|. An isolated file system can be
66  // created for a set of native files/directories (like dropped files)
67  // using fileapi::IsolatedContext. A child process needs to be granted
68  // permission to the file system to access the files in it using
69  // file system URL.
70  //
71  // Note: to grant read access to the content of files you also need
72  // to give permission directly to the file paths using GrantReadFile.
73  // TODO(kinuko): We should unify this file-level and file-system-level
74  // permission when a file is accessed via a file system.
75  //
76  // Note: files/directories in the same file system share the same
77  // permission as far as they are accessed via the file system, i.e.
78  // using the file system URL (tip: you can create a new file system
79  // to give different permission to part of files).
80  virtual void GrantReadFileSystem(int child_id,
81                                   const std::string& filesystem_id) = 0;
82
83  // Grants write access permission to the given isolated file system
84  // identified by |filesystem_id|.  See comments for GrantReadFileSystem
85  // for more details.  For writing you do NOT need to give direct permission
86  // to individual file paths.
87  //
88  // This must be called with a great care as this gives write permission
89  // to all files/directories included in the file system.
90  virtual void GrantWriteFileSystem(int child_id,
91                                    const std::string& filesystem_id) = 0;
92
93  // Grant create file permission to the given isolated file system identified
94  // by |filesystem_id|.
95  // See comments for GrantReadFileSystem for more details.  For creating you
96  // do NOT need to give direct permission to individual file paths.
97  //
98  // This must be called with a great care as this gives create permission
99  // within all directories included in the file system.
100  virtual void GrantCreateFileForFileSystem(
101      int child_id,
102      const std::string& filesystem_id) = 0;
103
104  // Grants permission to copy-into filesystem |filesystem_id|. 'copy-into'
105  // is used to allow copying files into the destination filesystem without
106  // granting more general create and write permissions.
107  virtual void GrantCopyIntoFileSystem(int child_id,
108                                       const std::string& filesystem_id) = 0;
109
110  // Grants permission to delete from filesystem |filesystem_id|. 'delete-from'
111  // is used to allow deleting files into the destination filesystem without
112  // granting more general create and write permissions.
113  virtual void GrantDeleteFromFileSystem(int child_id,
114                                         const std::string& filesystem_id) = 0;
115
116  // Grants the child process the capability to access URLs of the provided
117  // scheme.
118  virtual void GrantScheme(int child_id, const std::string& scheme) = 0;
119
120  // Returns true if read access has been granted to |filesystem_id|.
121  virtual bool CanReadFileSystem(int child_id,
122                                 const std::string& filesystem_id) = 0;
123
124  // Returns true if read and write access has been granted to |filesystem_id|.
125  virtual bool CanReadWriteFileSystem(int child_id,
126                                      const std::string& filesystem_id) = 0;
127
128  // Returns true if copy-into access has been granted to |filesystem_id|.
129  virtual bool CanCopyIntoFileSystem(int child_id,
130                                     const std::string& filesystem_id) = 0;
131
132  // Returns true if delete-from access has been granted to |filesystem_id|.
133  virtual bool CanDeleteFromFileSystem(int child_id,
134                                       const std::string& filesystem_id) = 0;
135};
136
137};  // namespace content
138
139#endif  // CONTENT_PUBLIC_BROWSER_CHILD_PROCESS_SECURITY_POLICY_H_
140