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
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "TrustyGateKeeper"
#include <endian.h>
#include <limits>
#include <android-base/logging.h>
#include <gatekeeper/password_handle.h>
#include <hardware/hw_auth_token.h>
#include "gatekeeper_ipc.h"
#include "trusty_gatekeeper.h"
#include "trusty_gatekeeper_ipc.h"
namespace aidl::android::hardware::gatekeeper {
using ::gatekeeper::ERROR_INVALID;
using ::gatekeeper::ERROR_NONE;
using ::gatekeeper::ERROR_RETRY;
using ::gatekeeper::SizedBuffer;
using ::gatekeeper::VerifyRequest;
using ::gatekeeper::VerifyResponse;
constexpr const uint32_t SEND_BUF_SIZE = 8192;
constexpr const uint32_t RECV_BUF_SIZE = 8192;
TrustyGateKeeperDevice::TrustyGateKeeperDevice() {
int rc = trusty_gatekeeper_connect();
if (rc < 0) {
LOG(ERROR) << "Error initializing trusty session: " << rc;
}
error_ = rc;
}
TrustyGateKeeperDevice::~TrustyGateKeeperDevice() {
trusty_gatekeeper_disconnect();
}
SizedBuffer vec2sized_buffer(const std::vector<uint8_t>& vec) {
if (vec.size() == 0 || vec.size() > std::numeric_limits<uint32_t>::max()) return {};
auto buffer = new uint8_t[vec.size()];
std::copy(vec.begin(), vec.end(), buffer);
return {buffer, static_cast<uint32_t>(vec.size())};
}
void sizedBuffer2AidlHWToken(SizedBuffer& buffer,
android::hardware::security::keymint::HardwareAuthToken* aidlToken) {
const hw_auth_token_t* authToken =
reinterpret_cast<const hw_auth_token_t*>(buffer.Data<uint8_t>());
aidlToken->challenge = authToken->challenge;
aidlToken->userId = authToken->user_id;
aidlToken->authenticatorId = authToken->authenticator_id;
// these are in network order: translate to host
aidlToken->authenticatorType =
static_cast<android::hardware::security::keymint::HardwareAuthenticatorType>(
be32toh(authToken->authenticator_type));
aidlToken->timestamp.milliSeconds = be64toh(authToken->timestamp);
aidlToken->mac.insert(aidlToken->mac.begin(), std::begin(authToken->hmac),
std::end(authToken->hmac));
}
::ndk::ScopedAStatus TrustyGateKeeperDevice::enroll(
int32_t uid, const std::vector<uint8_t>& currentPasswordHandle,
const std::vector<uint8_t>& currentPassword, const std::vector<uint8_t>& desiredPassword,
GatekeeperEnrollResponse* rsp) {
if (error_ != 0) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificError(ERROR_GENERAL_FAILURE));
}
if (desiredPassword.size() == 0) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificError(ERROR_GENERAL_FAILURE));
}
EnrollRequest request(uid, vec2sized_buffer(currentPasswordHandle),
vec2sized_buffer(desiredPassword), vec2sized_buffer(currentPassword));
EnrollResponse response;
auto error = Send(request, &response);
if (error != ERROR_NONE) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificError(ERROR_GENERAL_FAILURE));
} else if (response.error == ERROR_RETRY) {
*rsp = {ERROR_RETRY_TIMEOUT, static_cast<int32_t>(response.retry_timeout), 0, {}};
return ndk::ScopedAStatus::ok();
} else if (response.error != ERROR_NONE) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificError(ERROR_GENERAL_FAILURE));
} else {
const ::gatekeeper::password_handle_t* password_handle =
response.enrolled_password_handle.Data<::gatekeeper::password_handle_t>();
*rsp = {STATUS_OK,
0,
static_cast<int64_t>(password_handle->user_id),
{response.enrolled_password_handle.Data<uint8_t>(),
(response.enrolled_password_handle.Data<uint8_t>() +
response.enrolled_password_handle.size())}};
}
return ndk::ScopedAStatus::ok();
}
::ndk::ScopedAStatus TrustyGateKeeperDevice::verify(
int32_t uid, int64_t challenge, const std::vector<uint8_t>& enrolledPasswordHandle,
const std::vector<uint8_t>& providedPassword, GatekeeperVerifyResponse* rsp) {
if (error_ != 0) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificError(ERROR_GENERAL_FAILURE));
}
if (enrolledPasswordHandle.size() == 0) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificError(ERROR_GENERAL_FAILURE));
}
VerifyRequest request(uid, challenge, vec2sized_buffer(enrolledPasswordHandle),
vec2sized_buffer(providedPassword));
VerifyResponse response;
auto error = Send(request, &response);
if (error != ERROR_NONE) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificError(ERROR_GENERAL_FAILURE));
} else if (response.error == ERROR_RETRY) {
*rsp = {ERROR_RETRY_TIMEOUT, static_cast<int32_t>(response.retry_timeout), {}};
return ndk::ScopedAStatus::ok();
} else if (response.error != ERROR_NONE) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificError(ERROR_GENERAL_FAILURE));
} else {
// On Success, return GatekeeperVerifyResponse with Success Status, timeout{0} and
// valid HardwareAuthToken.
*rsp = {response.request_reenroll ? STATUS_REENROLL : STATUS_OK, 0, {}};
// Convert the hw_auth_token_t to HardwareAuthToken in the response.
sizedBuffer2AidlHWToken(response.auth_token, &rsp->hardwareAuthToken);
}
return ndk::ScopedAStatus::ok();
}
::ndk::ScopedAStatus TrustyGateKeeperDevice::deleteUser(int32_t uid) {
if (error_ != 0) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificError(ERROR_GENERAL_FAILURE));
}
DeleteUserRequest request(uid);
DeleteUserResponse response;
auto error = Send(request, &response);
if (error != ERROR_NONE) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificError(ERROR_GENERAL_FAILURE));
} else if (response.error == ERROR_NOT_IMPLEMENTED) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificError(ERROR_NOT_IMPLEMENTED));
} else if (response.error != ERROR_NONE) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificError(ERROR_GENERAL_FAILURE));
} else {
return ndk::ScopedAStatus::ok();
}
}
::ndk::ScopedAStatus TrustyGateKeeperDevice::deleteAllUsers() {
if (error_ != 0) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificError(ERROR_GENERAL_FAILURE));
}
DeleteAllUsersRequest request;
DeleteAllUsersResponse response;
auto error = Send(request, &response);
if (error != ERROR_NONE) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificError(ERROR_GENERAL_FAILURE));
} else if (response.error == ERROR_NOT_IMPLEMENTED) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificError(ERROR_NOT_IMPLEMENTED));
} else if (response.error != ERROR_NONE) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificError(ERROR_GENERAL_FAILURE));
} else {
return ndk::ScopedAStatus::ok();
}
}
gatekeeper_error_t TrustyGateKeeperDevice::Send(uint32_t command, const GateKeeperMessage& request,
GateKeeperMessage *response) {
uint32_t request_size = request.GetSerializedSize();
if (request_size > SEND_BUF_SIZE)
return ERROR_INVALID;
uint8_t send_buf[SEND_BUF_SIZE];
request.Serialize(send_buf, send_buf + request_size);
// Send it
uint8_t recv_buf[RECV_BUF_SIZE];
uint32_t response_size = RECV_BUF_SIZE;
int rc = trusty_gatekeeper_call(command, send_buf, request_size, recv_buf, &response_size);
if (rc < 0) {
LOG(ERROR) << "error (" << rc << ") calling gatekeeper TA";
return ERROR_INVALID;
}
const gatekeeper_message *msg = reinterpret_cast<gatekeeper_message *>(recv_buf);
const uint8_t *payload = msg->payload;
return response->Deserialize(payload, payload + response_size);
}
} // namespace aidl::android::hardware::gatekeeper
|
