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
|
// 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.
#ifndef CRYPTO_NSS_UTIL_H_
#define CRYPTO_NSS_UTIL_H_
#pragma once
#include <string>
#include "base/basictypes.h"
#include "crypto/crypto_export.h"
#if defined(USE_NSS)
class FilePath;
#endif // defined(USE_NSS)
namespace base {
class Lock;
class Time;
} // namespace base
// This file specifically doesn't depend on any NSS or NSPR headers because it
// is included by various (non-crypto) parts of chrome to call the
// initialization functions.
namespace crypto {
class SymmetricKey;
#if defined(USE_NSS)
// EarlySetupForNSSInit performs lightweight setup which must occur before the
// process goes multithreaded. This does not initialise NSS. For test, see
// EnsureNSSInit.
CRYPTO_EXPORT void EarlySetupForNSSInit();
#endif
// Initialize NRPR if it isn't already initialized. This function is
// thread-safe, and NSPR will only ever be initialized once.
CRYPTO_EXPORT void EnsureNSPRInit();
// Initialize NSS if it isn't already initialized. This must be called before
// any other NSS functions. This function is thread-safe, and NSS will only
// ever be initialized once.
CRYPTO_EXPORT void EnsureNSSInit();
// Call this before calling EnsureNSSInit() will force NSS to initialize
// without a persistent DB. This is used for the special case where access of
// persistent DB is prohibited.
//
// TODO(hclam): Isolate loading default root certs.
//
// NSS will be initialized without loading any user security modules, including
// the built-in root certificates module. User security modules need to be
// loaded manually after NSS initialization.
//
// If EnsureNSSInit() is called before then this function has no effect.
//
// Calling this method only has effect on Linux.
//
// WARNING: Use this with caution.
CRYPTO_EXPORT void ForceNSSNoDBInit();
// This methods is used to disable checks in NSS when used in a forked process.
// NSS checks whether it is running a forked process to avoid problems when
// using user security modules in a forked process. However if we are sure
// there are no modules loaded before the process is forked then there is no
// harm disabling the check.
//
// This method must be called before EnsureNSSInit() to take effect.
//
// WARNING: Use this with caution.
CRYPTO_EXPORT void DisableNSSForkCheck();
// Load NSS library files. This function has no effect on Mac and Windows.
// This loads the necessary NSS library files so that NSS can be initialized
// after loading additional library files is disallowed, for example when the
// sandbox is active.
//
// Note that this does not load libnssckbi.so which contains the root
// certificates.
CRYPTO_EXPORT void LoadNSSLibraries();
// Check if the current NSS version is greater than or equals to |version|.
// A sample version string is "3.12.3".
bool CheckNSSVersion(const char* version);
#if defined(OS_CHROMEOS)
// Open the r/w nssdb that's stored inside the user's encrypted home
// directory. This is the default slot returned by
// GetPublicNSSKeySlot().
CRYPTO_EXPORT void OpenPersistentNSSDB();
// Indicates that NSS should load the Chaps library so that we
// can access the TPM through NSS. Once this is called,
// GetPrivateNSSKeySlot() will return the TPM slot if one was found.
CRYPTO_EXPORT void EnableTPMTokenForNSS();
// Get name and user PIN for the built-in TPM token on ChromeOS.
// Either one can safely be NULL. Should only be called after
// EnableTPMTokenForNSS has been called with a non-null delegate.
CRYPTO_EXPORT void GetTPMTokenInfo(std::string* token_name,
std::string* user_pin);
// Returns true if the TPM is owned and PKCS#11 initialized with the
// user and security officer PINs, and has been enabled in NSS by
// calling EnableTPMForNSS, and Chaps has been successfully
// loaded into NSS.
CRYPTO_EXPORT bool IsTPMTokenReady();
// Initialize the TPM token. Does nothing if it is already initialized.
CRYPTO_EXPORT bool InitializeTPMToken(const std::string& token_name,
const std::string& user_pin);
// Gets supplemental user key. Creates one in NSS database if it does not exist.
// The supplemental user key is used for AES encryption of user data that is
// stored and protected by cryptohome. This additional layer of encryption of
// provided to ensure that sensitive data wouldn't be exposed in plain text in
// case when an attacker would somehow gain access to all content within
// cryptohome.
CRYPTO_EXPORT SymmetricKey* GetSupplementalUserKey();
#endif
// Convert a NSS PRTime value into a base::Time object.
// We use a int64 instead of PRTime here to avoid depending on NSPR headers.
CRYPTO_EXPORT base::Time PRTimeToBaseTime(int64 prtime);
// Convert a base::Time object into a PRTime value.
// We use a int64 instead of PRTime here to avoid depending on NSPR headers.
CRYPTO_EXPORT int64 BaseTimeToPRTime(base::Time time);
#if defined(USE_NSS)
// Exposed for unittests only.
// TODO(mattm): when https://bugzilla.mozilla.org/show_bug.cgi?id=588269 is
// fixed, switch back to using a separate userdb for each test. (Maybe refactor
// to provide a ScopedTestNSSDB instead of open/close methods.)
CRYPTO_EXPORT bool OpenTestNSSDB();
// NOTE: due to NSS bug 588269, mentioned above, there is no CloseTestNSSDB.
// NSS has a bug which can cause a deadlock or stall in some cases when writing
// to the certDB and keyDB. It also has a bug which causes concurrent key pair
// generations to scribble over each other. To work around this, we synchronize
// writes to the NSS databases with a global lock. The lock is hidden beneath a
// function for easy disabling when the bug is fixed. Callers should allow for
// it to return NULL in the future.
//
// See https://bugzilla.mozilla.org/show_bug.cgi?id=564011
base::Lock* GetNSSWriteLock();
// A helper class that acquires the NSS write Lock while the AutoNSSWriteLock
// is in scope.
class CRYPTO_EXPORT AutoNSSWriteLock {
public:
AutoNSSWriteLock();
~AutoNSSWriteLock();
private:
base::Lock *lock_;
DISALLOW_COPY_AND_ASSIGN(AutoNSSWriteLock);
};
#endif // defined(USE_NSS)
} // namespace crypto
#endif // CRYPTO_NSS_UTIL_H_
|