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device: proper handling of user input

(1) If the user denies something on the Ledger,
    a proper error message is now shown.
(2) Ledger doesn't time out anymore while waiting
    on user input.
(3) Lower the timeout to 2 seconds, this is enough for
    normal Ledger <-> System communication.
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selsta committed Jan 9, 2019
1 parent 094b0c4 commit 6c060e6aaa26cd7e0161f075b52f093769195cd2
@@ -50,7 +50,7 @@ namespace hw {
virtual void disconnect() = 0;
virtual bool connected() const = 0;

virtual int exchange(unsigned char *command, unsigned int cmd_len, unsigned char *response, unsigned int max_resp_len) = 0;
virtual int exchange(unsigned char *command, unsigned int cmd_len, unsigned char *response, unsigned int max_resp_len, bool user_input) = 0;
};
};
};
@@ -148,7 +148,7 @@ namespace hw {
return this->usb_device != NULL;
}

int device_io_hid::exchange(unsigned char *command, unsigned int cmd_len, unsigned char *response, unsigned int max_resp_len) {
int device_io_hid::exchange(unsigned char *command, unsigned int cmd_len, unsigned char *response, unsigned int max_resp_len, bool user_input) {
unsigned char buffer[400];
unsigned char padding_buffer[MAX_BLOCK+1];
unsigned int result;
@@ -177,7 +177,11 @@ namespace hw {

//get first response
memset(buffer, 0, sizeof(buffer));
hid_ret = hid_read_timeout(this->usb_device, buffer, MAX_BLOCK, this->timeout);
if (!user_input) {
hid_ret = hid_read_timeout(this->usb_device, buffer, MAX_BLOCK, this->timeout);
} else {
hid_ret = hid_read(this->usb_device, buffer, MAX_BLOCK);
}
ASSERT_X(hid_ret>=0, "Unable to read hidapi response. Error "+std::to_string(result)+": "+ safe_hid_error(this->usb_device));
result = (unsigned int)hid_ret;
io_hid_log(1, buffer, result);
@@ -100,7 +100,7 @@ namespace hw {
void connect(void *params);
void connect(unsigned int vid, unsigned int pid, boost::optional<int> interface_number, boost::optional<unsigned short> usage_page);
bool connected() const;
int exchange(unsigned char *command, unsigned int cmd_len, unsigned char *response, unsigned int max_resp_len);
int exchange(unsigned char *command, unsigned int cmd_len, unsigned char *response, unsigned int max_resp_len, bool user_input);
void disconnect();
void release();
};
@@ -176,7 +176,7 @@ namespace hw {
#define INS_GET_RESPONSE 0xc0


device_ledger::device_ledger(): hw_device(0x0101, 0x05, 64, 120000) {
device_ledger::device_ledger(): hw_device(0x0101, 0x05, 64, 2000) {
this->id = device_id++;
this->reset_buffer();
this->mode = NONE;
@@ -235,6 +235,9 @@ namespace hw {
/* IO */
/* ======================================================================= */

#define IO_SW_DENY 0x6982
#define IO_SECRET_KEY 0x02

void device_ledger::logCMD() {
if (apdu_verbose) {
char strbuffer[1024];
@@ -283,7 +286,12 @@ namespace hw {

void device_ledger::send_simple(unsigned char ins, unsigned char p1) {
this->length_send = set_command_header_noopt(ins, p1);
this->exchange();
if (ins == INS_GET_KEY && p1 == IO_SECRET_KEY) {
// export view key user input
this->exchange_wait_on_input();
} else {
this->exchange();
}
}

bool device_ledger::reset() {
@@ -294,7 +302,7 @@ namespace hw {
unsigned int device_ledger::exchange(unsigned int ok, unsigned int mask) {
logCMD();

this->length_recv = hw_device.exchange(this->buffer_send, this->length_send, this->buffer_recv, BUFFER_SEND_SIZE);
this->length_recv = hw_device.exchange(this->buffer_send, this->length_send, this->buffer_recv, BUFFER_SEND_SIZE, false);
ASSERT_X(this->length_recv>=2, "Communication error, less than tow bytes received");

this->length_recv -= 2;
@@ -305,6 +313,25 @@ namespace hw {
return this->sw;
}

unsigned int device_ledger::exchange_wait_on_input(unsigned int ok, unsigned int mask) {
logCMD();
unsigned int deny = 0;
this->length_recv = hw_device.exchange(this->buffer_send, this->length_send, this->buffer_recv, BUFFER_SEND_SIZE, true);
ASSERT_X(this->length_recv>=2, "Communication error, less than two bytes received");

this->length_recv -= 2;
this->sw = (this->buffer_recv[length_recv]<<8) | this->buffer_recv[length_recv+1];
if (this->sw == IO_SW_DENY) {
// cancel on device
deny = 1;
} else {
ASSERT_SW(this->sw,ok,msk);
}

logRESP();
return deny;
}

void device_ledger::reset_buffer() {
this->length_send = 0;
memset(this->buffer_send, 0, BUFFER_SEND_SIZE);
@@ -1260,7 +1287,8 @@ namespace hw {

this->buffer_send[4] = offset-5;
this->length_send = offset;
this->exchange();
// check fee user input
CHECK_AND_ASSERT_THROW_MES(this->exchange_wait_on_input() == 0, "Fee denied on device.");

//pseudoOuts
if (type == rct::RCTTypeSimple) {
@@ -1328,7 +1356,8 @@ namespace hw {

this->buffer_send[4] = offset-5;
this->length_send = offset;
this->exchange();
// check transaction user input
CHECK_AND_ASSERT_THROW_MES(this->exchange_wait_on_input() == 0, "Transaction denied on device.");
#ifdef DEBUG_HWDEVICE
hw::ledger::log_hexbuffer("Prehash AKV input", (char*)&this->buffer_recv[64], 3*32);
#endif
@@ -95,6 +95,7 @@ namespace hw {
void logCMD(void);
void logRESP(void);
unsigned int exchange(unsigned int ok=0x9000, unsigned int mask=0xFFFF);
unsigned int exchange_wait_on_input(unsigned int ok=0x9000, unsigned int mask=0xFFFF);
void reset_buffer(void);
int set_command_header(unsigned char ins, unsigned char p1 = 0x00, unsigned char p2 = 0x00);
int set_command_header_noopt(unsigned char ins, unsigned char p1 = 0x00, unsigned char p2 = 0x00);

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