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
157
158
159
160
161
162
163
164
165
|
/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019-2020 WireGuard LLC. All Rights Reserved.
*/
package conf
import (
"debug/pe"
"errors"
"os"
"path/filepath"
"strings"
"unsafe"
"golang.org/x/sys/windows"
"golang.org/x/sys/windows/registry"
)
var cachedConfigFileDir string
var cachedRootDir string
var disableAutoMigration bool
func tunnelConfigurationsDirectory() (string, error) {
if cachedConfigFileDir != "" {
return cachedConfigFileDir, nil
}
root, err := RootDirectory(true)
if err != nil {
return "", err
}
c := filepath.Join(root, "Configurations")
err = os.Mkdir(c, os.ModeDir|0700)
if err != nil && !os.IsExist(err) {
return "", err
}
maybeMigrateConfiguration(c)
cachedConfigFileDir = c
return cachedConfigFileDir, nil
}
// PresetRootDirectory causes RootDirectory() to not try any automatic deduction, and instead
// uses what's passed to it. This isn't used by wireguard-windows, but is useful for external
// consumers of our libraries who might want to do strange things.
func PresetRootDirectory(root string) {
cachedRootDir = root
disableAutoMigration = true
}
func RootDirectory(create bool) (string, error) {
if cachedRootDir != "" {
return cachedRootDir, nil
}
//TODO: remove the wow detection logic when Go supports arm64
var isWow bool
var processMachine, nativeMachine uint16
err := windows.IsWow64Process2(windows.CurrentProcess(), &processMachine, &nativeMachine)
if err == nil {
isWow = processMachine != pe.IMAGE_FILE_MACHINE_UNKNOWN
} else {
if !errors.Is(err, windows.ERROR_PROC_NOT_FOUND) {
return "", err
}
err = windows.IsWow64Process(windows.CurrentProcess(), &isWow)
if err != nil {
return "", err
}
}
var root string
if !isWow {
root, err = windows.KnownFolderPath(windows.FOLDERID_ProgramFiles, windows.KF_FLAG_DEFAULT)
if err != nil {
return "", err
}
} else {
key, err := registry.OpenKey(windows.HKEY_LOCAL_MACHINE, `SOFTWARE\Microsoft\Windows\CurrentVersion`, registry.READ|registry.WOW64_64KEY)
if err != nil {
return "", err
}
var typ uint32
root, typ, err = key.GetStringValue("ProgramFilesDir")
key.Close()
if err != nil {
return "", err
}
if typ != registry.SZ {
return "", registry.ErrUnexpectedType
}
}
root = filepath.Join(root, "WireGuard")
if !create {
return filepath.Join(root, "Data"), nil
}
root16, err := windows.UTF16PtrFromString(root)
if err != nil {
return "", err
}
// The root directory inherits its ACL from Program Files; we don't want to mess with that
err = windows.CreateDirectory(root16, nil)
if err != nil && err != windows.ERROR_ALREADY_EXISTS {
return "", err
}
dataDirectorySd, err := windows.SecurityDescriptorFromString("O:SYG:SYD:PAI(A;OICI;FA;;;SY)(A;OICI;FA;;;BA)")
if err != nil {
return "", err
}
dataDirectorySa := &windows.SecurityAttributes{
Length: uint32(unsafe.Sizeof(windows.SecurityAttributes{})),
SecurityDescriptor: dataDirectorySd,
}
data := filepath.Join(root, "Data")
data16, err := windows.UTF16PtrFromString(data)
if err != nil {
return "", err
}
var dataHandle windows.Handle
for {
err = windows.CreateDirectory(data16, dataDirectorySa)
if err != nil && err != windows.ERROR_ALREADY_EXISTS {
return "", err
}
dataHandle, err = windows.CreateFile(data16, windows.READ_CONTROL|windows.WRITE_OWNER|windows.WRITE_DAC, windows.FILE_SHARE_READ|windows.FILE_SHARE_WRITE|windows.FILE_SHARE_DELETE, nil, windows.OPEN_EXISTING, windows.FILE_FLAG_BACKUP_SEMANTICS|windows.FILE_FLAG_OPEN_REPARSE_POINT|windows.FILE_ATTRIBUTE_DIRECTORY, 0)
if err != nil && err != windows.ERROR_FILE_NOT_FOUND {
return "", err
}
if err == nil {
break
}
}
defer windows.CloseHandle(dataHandle)
var fileInfo windows.ByHandleFileInformation
err = windows.GetFileInformationByHandle(dataHandle, &fileInfo)
if err != nil {
return "", err
}
if fileInfo.FileAttributes&windows.FILE_ATTRIBUTE_DIRECTORY == 0 {
return "", errors.New("Data directory is actually a file")
}
if fileInfo.FileAttributes&windows.FILE_ATTRIBUTE_REPARSE_POINT != 0 {
return "", errors.New("Data directory is reparse point")
}
buf := make([]uint16, windows.MAX_PATH+4)
for {
bufLen, err := windows.GetFinalPathNameByHandle(dataHandle, &buf[0], uint32(len(buf)), 0)
if err != nil {
return "", err
}
if bufLen < uint32(len(buf)) {
break
}
buf = make([]uint16, bufLen)
}
if !strings.EqualFold(`\\?\`+data, windows.UTF16ToString(buf[:])) {
return "", errors.New("Data directory jumped to unexpected location")
}
err = windows.SetKernelObjectSecurity(dataHandle, windows.DACL_SECURITY_INFORMATION|windows.GROUP_SECURITY_INFORMATION|windows.OWNER_SECURITY_INFORMATION|windows.PROTECTED_DACL_SECURITY_INFORMATION, dataDirectorySd)
if err != nil {
return "", err
}
cachedRootDir = data
return cachedRootDir, nil
}
|
