filesystem_policy.h revision 03b57e008b61dfcb1fbad3aea950ae0e001748b0 
1// Copyright (c) 2006-2008 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 SANDBOX_SRC_FILESYSTEM_POLICY_H__
6#define SANDBOX_SRC_FILESYSTEM_POLICY_H__
7
8#include <string>
9
10#include "base/basictypes.h"
11#include "base/strings/string16.h"
12#include "sandbox/win/src/crosscall_server.h"
13#include "sandbox/win/src/nt_internals.h"
14#include "sandbox/win/src/policy_low_level.h"
15#include "sandbox/win/src/sandbox_policy.h"
16
17namespace sandbox {
18
19enum EvalResult;
20
21// This class centralizes most of the knowledge related to file system policy
22class FileSystemPolicy {
23 public:
24  // Creates the required low-level policy rules to evaluate a high-level
25  // policy rule for File IO, in particular open or create actions.
26  // 'name' is the file or directory name.
27  // 'semantics' is the desired semantics for the open or create.
28  // 'policy' is the policy generator to which the rules are going to be added.
29  static bool GenerateRules(const wchar_t* name,
30                            TargetPolicy::Semantics semantics,
31                            LowLevelPolicy* policy);
32
33  // Add basic file system rules.
34  static bool SetInitialRules(LowLevelPolicy* policy);
35
36  // Performs the desired policy action on a create request with an
37  // API that is compatible with the IPC-received parameters.
38  // 'client_info' : the target process that is making the request.
39  // 'eval_result' : The desired policy action to accomplish.
40  // 'file' : The target file or directory.
41  static bool CreateFileAction(EvalResult eval_result,
42                               const ClientInfo& client_info,
43                               const base::string16 &file,
44                               uint32 attributes,
45                               uint32 desired_access,
46                               uint32 file_attributes,
47                               uint32 share_access,
48                               uint32 create_disposition,
49                               uint32 create_options,
50                               HANDLE* handle,
51                               NTSTATUS* nt_status,
52                               ULONG_PTR* io_information);
53
54  // Performs the desired policy action on an open request with an
55  // API that is compatible with the IPC-received parameters.
56  // 'client_info' : the target process that is making the request.
57  // 'eval_result' : The desired policy action to accomplish.
58  // 'file' : The target file or directory.
59  static bool OpenFileAction(EvalResult eval_result,
60                             const ClientInfo& client_info,
61                             const base::string16 &file,
62                             uint32 attributes,
63                             uint32 desired_access,
64                             uint32 share_access,
65                             uint32 open_options,
66                             HANDLE* handle,
67                             NTSTATUS* nt_status,
68                             ULONG_PTR* io_information);
69
70  // Performs the desired policy action on a query request with an
71  // API that is compatible with the IPC-received parameters.
72  static bool QueryAttributesFileAction(EvalResult eval_result,
73                                        const ClientInfo& client_info,
74                                        const base::string16 &file,
75                                        uint32 attributes,
76                                        FILE_BASIC_INFORMATION* file_info,
77                                        NTSTATUS* nt_status);
78
79  // Performs the desired policy action on a query request with an
80  // API that is compatible with the IPC-received parameters.
81  static bool QueryFullAttributesFileAction(
82      EvalResult eval_result,
83      const ClientInfo& client_info,
84      const base::string16 &file,
85      uint32 attributes,
86      FILE_NETWORK_OPEN_INFORMATION* file_info,
87      NTSTATUS* nt_status);
88
89  // Performs the desired policy action on a set_info request with an
90  // API that is compatible with the IPC-received parameters.
91  static bool SetInformationFileAction(EvalResult eval_result,
92                                       const ClientInfo& client_info,
93                                       HANDLE target_file_handle,
94                                       void* file_info,
95                                       uint32 length,
96                                       uint32 info_class,
97                                       IO_STATUS_BLOCK* io_block,
98                                       NTSTATUS* nt_status);
99};
100
101// Expands the path and check if it's a reparse point. Returns false if
102// we cannot determine or if there is an unexpected error. In that case
103// the path cannot be trusted.
104bool PreProcessName(const base::string16& path, base::string16* new_path);
105
106// Corrects global paths to have a correctly escaped NT prefix at the
107// beginning. If the name has no NT prefix (either normal or escaped)
108// add the escaped form to the string
109base::string16 FixNTPrefixForMatch(const base::string16& name);
110
111}  // namespace sandbox
112
113#endif  // SANDBOX_SRC_FILESYSTEM_POLICY_H__
114