summaryrefslogtreecommitdiffstats
path: root/sandbox/win/src/sandbox.h
blob: 18c05ce6cfc5c05cc289c9aa4aec13854fc48172 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Sandbox is a sandbox library for windows processes. Use when you want a
// 'privileged' process and a 'locked down process' to interact with.
// The privileged process is called the broker and it is started by external
// means (such as the user starting it). The 'sandboxed' process is called the
// target and it is started by the broker. There can be many target processes
// started by a single broker process. This library provides facilities
// for both the broker and the target.
//
// The design rationale and relevant documents can be found at http://go/sbox.
//
// Note: this header does not include the SandboxFactory definitions because
// there are cases where the Sandbox library is linked against the main .exe
// while its API needs to be used in a DLL.

#ifndef SANDBOX_SRC_SANDBOX_H__
#define SANDBOX_SRC_SANDBOX_H__

#include <windows.h>

#include "base/basictypes.h"
#include "sandbox/src/sandbox_policy.h"
#include "sandbox/src/sandbox_types.h"

// sandbox: Google User-Land Application Sandbox
namespace sandbox {

class BrokerServices;
class ProcessState;
class TargetPolicy;
class TargetServices;

// BrokerServices exposes all the broker API.
// The basic use is to start the target(s) and wait for them to end.
//
// This API is intended to be called in the following order
// (error checking omitted):
//  BrokerServices* broker = SandboxFactory::GetBrokerServices();
//  broker->Init();
//  PROCESS_INFORMATION target;
//  broker->SpawnTarget(target_exe_path, target_args, &target);
//  ::ResumeThread(target->hThread);
//  // -- later you can call:
//  broker->WaitForAllTargets(option);
//
class BrokerServices {
 public:
  // Initializes the broker. Must be called before any other on this class.
  // returns ALL_OK if successful. All other return values imply failure.
  // If the return is ERROR_GENERIC, you can call ::GetLastError() to get
  // more information.
  virtual ResultCode Init() = 0;

  // Returns the interface pointer to a new, empty policy object. Use this
  // interface to specify the sandbox policy for new processes created by
  // SpawnTarget()
  virtual TargetPolicy* CreatePolicy() = 0;

  // Creates a new target (child process) in a suspended state.
  // Parameters:
  //   exe_path: This is the full path to the target binary. This parameter
  //   can be null and in this case the exe path must be the first argument
  //   of the command_line.
  //   command_line: The arguments to be passed as command line to the new
  //   process. This can be null if the exe_path parameter is not null.
  //   policy: This is the pointer to the policy object for the sandbox to
  //   be created.
  //   target: returns the resulting target process information such as process
  //   handle and PID just as if CreateProcess() had been called. The caller is
  //   responsible for closing the handles returned in this structure.
  // Returns:
  //   ALL_OK if successful. All other return values imply failure.
  virtual ResultCode SpawnTarget(const wchar_t* exe_path,
                                 const wchar_t* command_line,
                                 TargetPolicy* policy,
                                 PROCESS_INFORMATION* target) = 0;

  // This call blocks (waits) for all the targets to terminate.
  // Returns:
  //   ALL_OK if successful. All other return values imply failure.
  //   If the return is ERROR_GENERIC, you can call ::GetLastError() to get
  //   more information.
  virtual ResultCode WaitForAllTargets() = 0;

  // Adds an unsandboxed process as a peer for policy decisions (e.g.
  // HANDLES_DUP_ANY policy).
  // Returns:
  //   ALL_OK if successful. All other return values imply failure.
  //   If the return is ERROR_GENERIC, you can call ::GetLastError() to get
  //   more information.
  virtual ResultCode AddTargetPeer(HANDLE peer_process) = 0;
};

// TargetServices models the current process from the perspective
// of a target process. To obtain a pointer to it use
// Sandbox::GetTargetServices(). Note that this call returns a non-null
// pointer only if this process is in fact a target. A process is a target
// only if the process was spawned by a call to BrokerServices::SpawnTarget().
//
// This API allows the target to gain access to resources with a high
// privilege token and then when it is ready to perform dangerous activities
// (such as download content from the web) it can lower its token and
// enter into locked-down (sandbox) mode.
// The typical usage is as follows:
//
//   TargetServices* target_services = Sandbox::GetTargetServices();
//   if (NULL != target_services) {
//     // We are the target.
//     target_services->Init();
//     // Do work that requires high privileges here.
//     // ....
//     // When ready to enter lock-down mode call LowerToken:
//     target_services->LowerToken();
//   }
//
// For more information see the BrokerServices API documentation.
class TargetServices {
 public:
  // Initializes the target. Must call this function before any other.
  // returns ALL_OK if successful. All other return values imply failure.
  // If the return is ERROR_GENERIC, you can call ::GetLastError() to get
  // more information.
  virtual ResultCode Init() = 0;

  // Discards the impersonation token and uses the lower token, call before
  // processing any untrusted data or running third-party code. If this call
  // fails the current process could be terminated immediately.
  virtual void LowerToken() = 0;

  // Returns the ProcessState object. Through that object it's possible to have
  // information about the current state of the process, such as whether
  // LowerToken has been called or not.
  virtual ProcessState* GetState() = 0;

  // Requests the broker to duplicate the supplied handle into the target
  // process. The target process must be an active sandbox child process
  // and the source process must have a corresponding policy allowing
  // handle duplication for this object type.
  // Returns:
  //   ALL_OK if successful. All other return values imply failure.
  //   If the return is ERROR_GENERIC, you can call ::GetLastError() to get
  //   more information.
  virtual ResultCode DuplicateHandle(HANDLE source_handle,
                                     DWORD target_process_id,
                                     HANDLE* target_handle,
                                     DWORD desired_access,
                                     DWORD options) = 0;
};

}  // namespace sandbox


#endif  // SANDBOX_SRC_SANDBOX_H__