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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/ash/components/multidevice/secure_message_delegate_impl.h"
#include "base/functional/bind.h"
#include "base/memory/ptr_util.h"
#include "chromeos/ash/components/dbus/easy_unlock/easy_unlock_client.h"
#include "chromeos/ash/components/multidevice/logging/logging.h"
#include "third_party/cros_system_api/dbus/service_constants.h"
namespace ash::multidevice {
namespace {
// Converts encryption type to a string representation used by EasyUnlock dbus
// client.
std::string EncSchemeToString(securemessage::EncScheme scheme) {
switch (scheme) {
case securemessage::AES_256_CBC:
return easy_unlock::kEncryptionTypeAES256CBC;
case securemessage::NONE:
return easy_unlock::kEncryptionTypeNone;
}
NOTREACHED();
}
// Converts signature type to a string representation used by EasyUnlock dbus
// client.
std::string SigSchemeToString(securemessage::SigScheme scheme) {
switch (scheme) {
case securemessage::ECDSA_P256_SHA256:
return easy_unlock::kSignatureTypeECDSAP256SHA256;
case securemessage::HMAC_SHA256:
return easy_unlock::kSignatureTypeHMACSHA256;
case securemessage::RSA2048_SHA256:
// RSA2048_SHA256 is not supported by the daemon.
NOTREACHED();
}
NOTREACHED();
}
} // namespace
// static
SecureMessageDelegateImpl::Factory*
SecureMessageDelegateImpl::Factory::test_factory_instance_ = nullptr;
// static
std::unique_ptr<SecureMessageDelegate>
SecureMessageDelegateImpl::Factory::Create() {
if (test_factory_instance_)
return test_factory_instance_->CreateInstance();
return base::WrapUnique(new SecureMessageDelegateImpl());
}
// static
void SecureMessageDelegateImpl::Factory::SetFactoryForTesting(
Factory* test_factory) {
test_factory_instance_ = test_factory;
}
SecureMessageDelegateImpl::Factory::~Factory() = default;
SecureMessageDelegateImpl::SecureMessageDelegateImpl()
: dbus_client_(EasyUnlockClient::Get()) {}
SecureMessageDelegateImpl::~SecureMessageDelegateImpl() {}
void SecureMessageDelegateImpl::GenerateKeyPair(
GenerateKeyPairCallback callback) {
dbus_client_->GenerateEcP256KeyPair(
base::BindOnce(&SecureMessageDelegateImpl::OnGenerateKeyPairResult,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void SecureMessageDelegateImpl::DeriveKey(const std::string& private_key,
const std::string& public_key,
DeriveKeyCallback callback) {
dbus_client_->PerformECDHKeyAgreement(
private_key, public_key,
base::BindOnce(&SecureMessageDelegateImpl::OnDeriveKeyResult,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void SecureMessageDelegateImpl::CreateSecureMessage(
const std::string& payload,
const std::string& key,
const CreateOptions& create_options,
CreateSecureMessageCallback callback) {
if (create_options.signature_scheme == securemessage::RSA2048_SHA256) {
PA_LOG(ERROR) << "Unable to create message: RSA2048_SHA256 not supported "
<< "by the ChromeOS daemon.";
std::move(callback).Run(std::string());
return;
}
EasyUnlockClient::CreateSecureMessageOptions options;
options.key.assign(key);
if (!create_options.associated_data.empty())
options.associated_data.assign(create_options.associated_data);
if (!create_options.public_metadata.empty())
options.public_metadata.assign(create_options.public_metadata);
if (!create_options.verification_key_id.empty())
options.verification_key_id.assign(create_options.verification_key_id);
if (!create_options.decryption_key_id.empty())
options.decryption_key_id.assign(create_options.decryption_key_id);
options.encryption_type = EncSchemeToString(create_options.encryption_scheme);
options.signature_type = SigSchemeToString(create_options.signature_scheme);
dbus_client_->CreateSecureMessage(
payload, options,
base::BindOnce(&SecureMessageDelegateImpl::OnCreateSecureMessageResult,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void SecureMessageDelegateImpl::UnwrapSecureMessage(
const std::string& serialized_message,
const std::string& key,
const UnwrapOptions& unwrap_options,
UnwrapSecureMessageCallback callback) {
if (unwrap_options.signature_scheme == securemessage::RSA2048_SHA256) {
PA_LOG(ERROR) << "Unable to unwrap message: RSA2048_SHA256 not supported "
<< "by the ChromeOS daemon.";
std::move(callback).Run(false, std::string(), securemessage::Header());
return;
}
EasyUnlockClient::UnwrapSecureMessageOptions options;
options.key.assign(key);
if (!unwrap_options.associated_data.empty())
options.associated_data.assign(unwrap_options.associated_data);
options.encryption_type = EncSchemeToString(unwrap_options.encryption_scheme);
options.signature_type = SigSchemeToString(unwrap_options.signature_scheme);
dbus_client_->UnwrapSecureMessage(
serialized_message, options,
base::BindOnce(&SecureMessageDelegateImpl::OnUnwrapSecureMessageResult,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void SecureMessageDelegateImpl::OnGenerateKeyPairResult(
GenerateKeyPairCallback callback,
const std::string& private_key,
const std::string& public_key) {
// The SecureMessageDelegate expects the keys in the reverse order returned by
// the DBus client.
std::move(callback).Run(public_key, private_key);
}
void SecureMessageDelegateImpl::OnDeriveKeyResult(
DeriveKeyCallback callback,
const std::string& derived_key) {
std::move(callback).Run(derived_key);
}
void SecureMessageDelegateImpl::OnCreateSecureMessageResult(
CreateSecureMessageCallback callback,
const std::string& secure_message) {
std::move(callback).Run(secure_message);
}
void SecureMessageDelegateImpl::OnUnwrapSecureMessageResult(
UnwrapSecureMessageCallback callback,
const std::string& unwrap_result) {
securemessage::HeaderAndBody header_and_body;
if (!header_and_body.ParseFromString(unwrap_result)) {
std::move(callback).Run(false, std::string(), securemessage::Header());
} else {
std::move(callback).Run(true, header_and_body.body(),
header_and_body.header());
}
}
} // namespace ash::multidevice
|
