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
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
#ifndef DEVICE_PROTO_H
#define DEVICE_PROTO_H
#include <utility>
#include <thread>
#include <type_traits>
#include <stdexcept>
#include <string>
#include <strings.h>
// a local version for compatibility with Windows
#include "inttypes.h"
#include "cxx_semantics.h"
#include "device.h"
#include "misc.h"
#include "log.h"
#include "command_id.h"
#include "dissect.h"
#include "CommandFailedException.h"
#define STICK20_UPDATE_MODE_VID 0x03EB
#define STICK20_UPDATE_MODE_PID 0x2FF1
#define PAYLOAD_SIZE 53
#define PWS_SLOT_COUNT 16
#define PWS_SLOTNAME_LENGTH 11
#define PWS_PASSWORD_LENGTH 20
#define PWS_LOGINNAME_LENGTH 32
#define PWS_SEND_PASSWORD 0
#define PWS_SEND_LOGINNAME 1
#define PWS_SEND_TAB 2
#define PWS_SEND_CR 3
namespace nitrokey {
namespace proto {
/*
* POD types for HID proto commands
* Instances are meant to be __packed.
*
* TODO (future) support for Big Endian
*/
/*
* Every packet is a USB HID report (check USB spec)
*/
template <CommandID cmd_id, typename Payload>
struct HIDReport {
uint8_t _zero;
CommandID command_id; // uint8_t
union {
uint8_t _padding[HID_REPORT_SIZE - 6];
Payload payload;
} __packed;
uint32_t crc;
// POD types can't have non-default constructors
// used in Transaction<>::run()
void initialize() {
bzero(this, sizeof *this);
command_id = cmd_id;
}
uint32_t calculate_CRC() const {
// w/o leading zero, a part of each HID packet
// w/o 4-byte crc
return misc::stm_crc32((const uint8_t *)(this) + 1,
(size_t)(HID_REPORT_SIZE - 5));
}
void update_CRC() { crc = calculate_CRC(); }
bool isCRCcorrect() const { return crc == calculate_CRC(); }
bool isValid() const {
return true;
// return !_zero && payload.isValid() && isCRCcorrect();
}
operator std::string() const {
// Packet type is known upfront in normal operation.
// Can't be used to dissect random packets.
return QueryDissector<cmd_id, decltype(*this)>::dissect(*this);
}
} __packed;
/*
* Response payload (the parametrized type inside struct HIDReport)
*
* command_id member in incoming HIDReport structure carries the command
* type last used.
*/
template <CommandID cmd_id, typename ResponsePayload>
struct DeviceResponse {
uint8_t _zero;
uint8_t device_status;
uint8_t command_id; // originally last_command_type
uint32_t last_command_crc;
uint8_t last_command_status;
union {
uint8_t _padding[HID_REPORT_SIZE - 12];
ResponsePayload payload;
} __packed;
uint32_t crc;
void initialize() { bzero(this, sizeof *this); }
uint32_t calculate_CRC() const {
// w/o leading zero, a part of each HID packet
// w/o 4-byte crc
return misc::stm_crc32((const uint8_t *)(this) + 1,
(size_t)(HID_REPORT_SIZE - 5));
}
void update_CRC() { crc = calculate_CRC(); }
bool isCRCcorrect() const { return crc == calculate_CRC(); }
bool isValid() const {
// return !_zero && payload.isValid() && isCRCcorrect() &&
// command_id == (uint8_t)(cmd_id);
return true;
}
operator std::string() const {
return ResponseDissector<cmd_id, decltype(*this)>::dissect(*this);
}
} __packed;
struct EmptyPayload {
uint8_t _data[];
bool isValid() const { return true; }
std::string dissect() const { return std::string("Empty Payload."); }
} __packed;
template <CommandID cmd_id, typename command_payload, typename response_payload>
class Transaction : semantics::non_constructible {
public:
// Types declared in command class scope can't be reached from there.
typedef command_payload CommandPayload;
typedef response_payload ResponsePayload;
typedef struct HIDReport<cmd_id, CommandPayload> OutgoingPacket;
typedef struct DeviceResponse<cmd_id, ResponsePayload> ResponsePacket;
static_assert(std::is_pod<OutgoingPacket>::value,
"outgoingpacket must be a pod type");
static_assert(std::is_pod<ResponsePacket>::value,
"ResponsePacket must be a POD type");
static_assert(sizeof(OutgoingPacket) == HID_REPORT_SIZE,
"OutgoingPacket type is not the right size");
static_assert(sizeof(ResponsePacket) == HID_REPORT_SIZE,
"ResponsePacket type is not the right size");
static uint32_t getCRC(
const command_payload &payload) {
OutgoingPacket outp;
outp.initialize();
outp.payload = payload;
outp.update_CRC();
return outp.crc;
}
static response_payload run(device::Device &dev,
const command_payload &payload) {
using namespace ::nitrokey::device;
using namespace ::nitrokey::log;
using namespace std::chrono_literals;
Log::instance()(__PRETTY_FUNCTION__, Loglevel::DEBUG_L2);
int status;
OutgoingPacket outp;
ResponsePacket resp;
// POD types can't have non-default constructors
outp.initialize();
resp.initialize();
outp.payload = payload;
outp.update_CRC();
Log::instance()("Outgoing HID packet:", Loglevel::DEBUG);
Log::instance()((std::string)(outp), Loglevel::DEBUG);
if (!outp.isValid()) throw std::runtime_error("Invalid outgoing packet");
status = dev.send(&outp);
if (status <= 0)
throw std::runtime_error(
std::string("Device error while sending command ") +
std::to_string((int)(status)));
std::this_thread::sleep_for(1000ms);
// FIXME make checks done in device:recv here
int retry = dev.get_retry_count();
while (retry-- > 0) {
status = dev.recv(&resp);
dev.set_last_command_status(resp.last_command_status); // FIXME should be handled on device.recv
if (resp.device_status == 0) break;
Log::instance()("Device status is not ready (CRC error?) retrying..",
Loglevel::DEBUG); // FIXME translate device_status to log
Log::instance()("Invalid incoming HID packet:", Loglevel::DEBUG_L2);
Log::instance()((std::string)(resp), Loglevel::DEBUG_L2);
std::this_thread::sleep_for(dev.get_retry_timeout());
continue;
}
if (status <= 0)
throw std::runtime_error(
std::string("Device error while executing command ") +
std::to_string(status));
Log::instance()("Incoming HID packet:", Loglevel::DEBUG);
Log::instance()((std::string)(resp), Loglevel::DEBUG);
if (!resp.isValid()) throw std::runtime_error("Invalid incoming packet");
if (resp.last_command_status!=0) throw CommandFailedException(resp.command_id, resp.last_command_status);
// See: DeviceResponse
return resp.payload;
}
static response_payload run(device::Device &dev) {
command_payload empty_payload;
return run(dev, empty_payload);
}
};
}
}
#endif
|
