child_process_security_policy.h revision 0f1bc08d4cfcc34181b0b5cbf065c40f687bf740 
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. You do NOT need to give direct permission to
70  // individual file paths.
71  //
72  // Note: files/directories in the same file system share the same
73  // permission as far as they are accessed via the file system, i.e.
74  // using the file system URL (tip: you can create a new file system
75  // to give different permission to part of files).
76  virtual void GrantReadFileSystem(int child_id,
77                                   const std::string& filesystem_id) = 0;
78
79  // Grants write access permission to the given isolated file system
80  // identified by |filesystem_id|.  See comments for GrantReadFileSystem
81  // for more details.  You do NOT need to give direct permission to
82  // individual file paths.
83  //
84  // This must be called with a great care as this gives write permission
85  // to all files/directories included in the file system.
86  virtual void GrantWriteFileSystem(int child_id,
87                                    const std::string& filesystem_id) = 0;
88
89  // Grants create file permission to the given isolated file system
90  // identified by |filesystem_id|.  See comments for GrantReadFileSystem
91  // for more details.  You do NOT need to give direct permission to
92  // individual file paths.
93  //
94  // This must be called with a great care as this gives create permission
95  // within all directories included in the file system.
96  virtual void GrantCreateFileForFileSystem(
97      int child_id,
98      const std::string& filesystem_id) = 0;
99
100  // Grants permission to copy-into filesystem |filesystem_id|. 'copy-into'
101  // is used to allow copying files into the destination filesystem without
102  // granting more general create and write permissions.
103  virtual void GrantCopyIntoFileSystem(int child_id,
104                                       const std::string& filesystem_id) = 0;
105
106  // Grants permission to delete from filesystem |filesystem_id|. 'delete-from'
107  // is used to allow deleting files into the destination filesystem without
108  // granting more general create and write permissions.
109  virtual void GrantDeleteFromFileSystem(int child_id,
110                                         const std::string& filesystem_id) = 0;
111
112  // Grants the child process the capability to access URLs of the provided
113  // scheme.
114  virtual void GrantScheme(int child_id, const std::string& scheme) = 0;
115
116  // Returns true if read access has been granted to |filesystem_id|.
117  virtual bool CanReadFileSystem(int child_id,
118                                 const std::string& filesystem_id) = 0;
119
120  // Returns true if read and write access has been granted to |filesystem_id|.
121  virtual bool CanReadWriteFileSystem(int child_id,
122                                      const std::string& filesystem_id) = 0;
123
124  // Returns true if copy-into access has been granted to |filesystem_id|.
125  virtual bool CanCopyIntoFileSystem(int child_id,
126                                     const std::string& filesystem_id) = 0;
127
128  // Returns true if delete-from access has been granted to |filesystem_id|.
129  virtual bool CanDeleteFromFileSystem(int child_id,
130                                       const std::string& filesystem_id) = 0;
131};
132
133}  // namespace content
134
135#endif  // CONTENT_PUBLIC_BROWSER_CHILD_PROCESS_SECURITY_POLICY_H_
136