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
|
/*
* 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 <android-base/logging.h>
#include <limits>
#include "trusty_gatekeeper.h"
#include "trusty_gatekeeper_ipc.h"
#include "gatekeeper_ipc.h"
using ::android::hardware::hidl_vec;
using ::android::hardware::Return;
using ::android::hardware::gatekeeper::V1_0::GatekeeperStatusCode;
using ::gatekeeper::EnrollRequest;
using ::gatekeeper::EnrollResponse;
using ::gatekeeper::ERROR_INVALID;
using ::gatekeeper::ERROR_MEMORY_ALLOCATION_FAILED;
using ::gatekeeper::ERROR_NONE;
using ::gatekeeper::ERROR_RETRY;
using ::gatekeeper::SizedBuffer;
using ::gatekeeper::VerifyRequest;
using ::gatekeeper::VerifyResponse;
namespace gatekeeper {
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 hidl_vec2sized_buffer(const hidl_vec<uint8_t>& vec) {
if (vec.size() == 0 || vec.size() > std::numeric_limits<uint32_t>::max()) return {};
auto dummy = new uint8_t[vec.size()];
std::copy(vec.begin(), vec.end(), dummy);
return {dummy, static_cast<uint32_t>(vec.size())};
}
Return<void> TrustyGateKeeperDevice::enroll(uint32_t uid,
const hidl_vec<uint8_t>& currentPasswordHandle,
const hidl_vec<uint8_t>& currentPassword,
const hidl_vec<uint8_t>& desiredPassword,
enroll_cb _hidl_cb) {
if (error_ != 0) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
return {};
}
if (desiredPassword.size() == 0) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
return {};
}
EnrollRequest request(uid, hidl_vec2sized_buffer(currentPasswordHandle),
hidl_vec2sized_buffer(desiredPassword),
hidl_vec2sized_buffer(currentPassword));
EnrollResponse response;
auto error = Send(request, &response);
if (error != ERROR_NONE) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
} else if (response.error == ERROR_RETRY) {
_hidl_cb({GatekeeperStatusCode::ERROR_RETRY_TIMEOUT, response.retry_timeout, {}});
} else if (response.error != ERROR_NONE) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
} else {
hidl_vec<uint8_t> new_handle(response.enrolled_password_handle.Data<uint8_t>(),
response.enrolled_password_handle.Data<uint8_t>() +
response.enrolled_password_handle.size());
_hidl_cb({GatekeeperStatusCode::STATUS_OK, response.retry_timeout, new_handle});
}
return {};
}
Return<void> TrustyGateKeeperDevice::verify(
uint32_t uid, uint64_t challenge,
const ::android::hardware::hidl_vec<uint8_t>& enrolledPasswordHandle,
const ::android::hardware::hidl_vec<uint8_t>& providedPassword, verify_cb _hidl_cb) {
if (error_ != 0) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
return {};
}
if (enrolledPasswordHandle.size() == 0) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
return {};
}
VerifyRequest request(uid, challenge, hidl_vec2sized_buffer(enrolledPasswordHandle),
hidl_vec2sized_buffer(providedPassword));
VerifyResponse response;
auto error = Send(request, &response);
if (error != ERROR_NONE) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
} else if (response.error == ERROR_RETRY) {
_hidl_cb({GatekeeperStatusCode::ERROR_RETRY_TIMEOUT, response.retry_timeout, {}});
} else if (response.error != ERROR_NONE) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
} else {
hidl_vec<uint8_t> auth_token(
response.auth_token.Data<uint8_t>(),
response.auth_token.Data<uint8_t>() + response.auth_token.size());
_hidl_cb({response.request_reenroll ? GatekeeperStatusCode::STATUS_REENROLL
: GatekeeperStatusCode::STATUS_OK,
response.retry_timeout, auth_token});
}
return {};
}
Return<void> TrustyGateKeeperDevice::deleteUser(uint32_t /*uid*/, deleteUser_cb _hidl_cb) {
_hidl_cb({GatekeeperStatusCode::ERROR_NOT_IMPLEMENTED, 0, {}});
return {};
}
Return<void> TrustyGateKeeperDevice::deleteAllUsers(deleteAllUsers_cb _hidl_cb) {
_hidl_cb({GatekeeperStatusCode::ERROR_NOT_IMPLEMENTED, 0, {}});
return {};
}
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);
}
};
|
