child_process_security_policy.h revision a3f7b4e666c476898878fa745f637129375cd889 
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  // This permission grants creation and write access to a file.
55  virtual void GrantCreateWriteFile(int child_id,
56                                    const base::FilePath& file) = 0;
57
58  // These methods verify whether or not the child process has been granted
59  // permissions perform these functions on |file|.
60
61  // Before servicing a child process's request to upload a file to the web, the
62  // browser should call this method to determine whether the process has the
63  // capability to upload the requested file.
64  virtual bool CanReadFile(int child_id, const base::FilePath& file) = 0;
65  virtual bool CanWriteFile(int child_id, const base::FilePath& file) = 0;
66  virtual bool CanCreateFile(int child_id, const base::FilePath& file) = 0;
67  virtual bool CanCreateWriteFile(int child_id, const base::FilePath& file) = 0;
68
69  // Grants read access permission to the given isolated file system
70  // identified by |filesystem_id|. An isolated file system can be
71  // created for a set of native files/directories (like dropped files)
72  // using fileapi::IsolatedContext. A child process needs to be granted
73  // permission to the file system to access the files in it using
74  // file system URL.
75  //
76  // Note: to grant read access to the content of files you also need
77  // to give permission directly to the file paths using GrantReadFile.
78  // TODO(kinuko): We should unify this file-level and file-system-level
79  // permission when a file is accessed via a file system.
80  //
81  // Note: files/directories in the same file system share the same
82  // permission as far as they are accessed via the file system, i.e.
83  // using the file system URL (tip: you can create a new file system
84  // to give different permission to part of files).
85  virtual void GrantReadFileSystem(int child_id,
86                                   const std::string& filesystem_id) = 0;
87
88  // Grants write access permission to the given isolated file system
89  // identified by |filesystem_id|.  See comments for GrantReadFileSystem
90  // for more details.  For writing you do NOT need to give direct permission
91  // to individual file paths.
92  //
93  // This must be called with a great care as this gives write permission
94  // to all files/directories included in the file system.
95  virtual void GrantWriteFileSystem(int child_id,
96                                    const std::string& filesystem_id) = 0;
97
98  // Grant create file permission to the given isolated file system identified
99  // by |filesystem_id|.
100  // See comments for GrantReadFileSystem for more details.  For creating you
101  // do NOT need to give direct permission to individual file paths.
102  //
103  // This must be called with a great care as this gives create permission
104  // within all directories included in the file system.
105  virtual void GrantCreateFileForFileSystem(
106      int child_id,
107      const std::string& filesystem_id) = 0;
108
109  // Grants permission to copy-into filesystem |filesystem_id|. 'copy-into'
110  // is used to allow copying files into the destination filesystem without
111  // granting more general create and write permissions.
112  virtual void GrantCopyIntoFileSystem(int child_id,
113                                       const std::string& filesystem_id) = 0;
114
115  // Grants the child process the capability to access URLs of the provided
116  // scheme.
117  virtual void GrantScheme(int child_id, const std::string& scheme) = 0;
118
119  // Returns true if read access has been granted to |filesystem_id|.
120  virtual bool CanReadFileSystem(int child_id,
121                                 const std::string& filesystem_id) = 0;
122
123  // Returns true if read and write access has been granted to |filesystem_id|.
124  virtual bool CanReadWriteFileSystem(int child_id,
125                                      const std::string& filesystem_id) = 0;
126
127  // Returns true if copy-into access has been granted to |filesystem_id|.
128  virtual bool CanCopyIntoFileSystem(int child_id,
129                                     const std::string& filesystem_id) = 0;
130};
131
132};  // namespace content
133
134#endif  // CONTENT_PUBLIC_BROWSER_CHILD_PROCESS_SECURITY_POLICY_H_
135