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smartcard.c
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smartcard.c
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#include "libc/stdio.h"
#include "libc/nostd.h"
#include "libiso7816.h"
/* TODO: add ISO14443 layer header here when it is implemented */
#include "api/libsmartcard.h"
/* Handling the debug output */
#include "smartcard_print.h"
/*** The following two functions help APDU fragmentation across multiple
* units (envelopes in T=0 and blocks in T=1, blocks for ISO14443 card, ...).
*/
/* Prepare the buffer to send */
unsigned int SC_APDU_get_encapsulated_apdu_size(SC_APDU_cmd *apdu, unsigned int *out_apdu_lc_size, unsigned int *out_apdu_le_size){
unsigned int apdu_size, apdu_lc_size, apdu_le_size;
if(apdu == NULL){
return 0;
}
/* Compute the APDU size */
if(apdu->send_le != 2){
/* Short APDU case for Lc */
apdu_lc_size = ((apdu->lc <= SHORT_APDU_LC_MAX) ? ((apdu->lc == 0) ? 0 : 1) : 3);
}
else{
/* Extended APDU case for Lc (forced whatever Lc size is) */
apdu_lc_size = (apdu->lc == 0) ? 0 : 3;
}
if(apdu->send_le){
/* apdu->send_le = 1 means short APDU encoding except if the size exceeds 256.
* apdu->send_le = 2 means extended APDU encoding for Le.
*/
if((apdu->le <= SHORT_APDU_LE_MAX) && (apdu->send_le == 1)){
apdu_le_size = 1;
}
else{
if(apdu_lc_size != 0){
apdu_le_size = 2;
}
else{
apdu_le_size = 3;
}
}
}
else{
apdu_le_size = 0;
}
apdu_size = 4 + apdu_lc_size + apdu->lc + apdu_le_size;
if(out_apdu_lc_size != NULL){
*out_apdu_lc_size = apdu_lc_size;
}
if(out_apdu_le_size != NULL){
*out_apdu_le_size = apdu_le_size;
}
return apdu_size;
}
uint8_t SC_APDU_prepare_buffer(SC_APDU_cmd *apdu, uint8_t *buffer, unsigned int i, uint8_t block_size, int *ret){
unsigned int apdu_size, apdu_lc_size, apdu_le_size;
unsigned int to_push, offset;
unsigned int size = 0;
*ret = 0;
/* Sanity checks on the lengths */
if(apdu->le > ((uint32_t)0x1 << 16)){
/* Absolute limits for Lc and Le (Lc is uint16, no need to check) */
*ret = -1;
return 0;
}
if((apdu->lc > APDU_MAX_BUFF_LEN) || (apdu->le > APDU_MAX_BUFF_LEN)){
*ret = -1;
return 0;
}
/* Compute the APDU size */
apdu_size = SC_APDU_get_encapsulated_apdu_size(apdu, &apdu_lc_size, &apdu_le_size);
/* Sanity checks */
if(apdu_size < (i * block_size)){
*ret = -1;
return 0;
}
if(apdu_size > (4 + APDU_MAX_BUFF_LEN + (2 * 3))){
*ret = -1;
return 0;
}
/* Size to push */
to_push = ((apdu_size - (i * block_size)) > block_size) ? block_size : (apdu_size - (i * block_size));
/* Sanity check on the pushed size.
* Not necessary with the previous formula, but better safe than sorry.
*/
if(to_push > block_size){
/* Overlow in buffer */
*ret = -1;
return 0;
}
/* Put as much data as we can in the buffer */
offset = i * block_size; /* offset where we begin */
size = 0;
while(size < to_push){
if((size >= block_size) || (size >= 256)){
/* Sanity check: our buffer should not exceed 256 bytes long anyways ... */
*ret = -1;
return 0;
}
/* Do we have to push CLA, IN, P1, P2? */
if(offset == 0){
if(size >= block_size){
/* Overflow ... this is an error */
*ret = -1;
return 0;
}
buffer[size++] = apdu->cla;
offset++;
continue;
}
if(offset == 1){
if(size >= block_size){
/* Overflow ... this is an error */
*ret = -1;
return 0;
}
buffer[size++] = apdu->ins;
offset++;
continue;
}
if(offset == 2){
if(size >= block_size){
/* Overflow ... this is an error */
*ret = -1;
return 0;
}
buffer[size++] = apdu->p1;
offset++;
continue;
}
if(offset == 3){
if(size >= block_size){
/* Overflow ... this is an error */
*ret = -1;
return 0;
}
buffer[size++] = apdu->p2;
offset++;
continue;
}
/* Handle Lc */
if((offset >= 4) && (offset < (apdu_size - apdu_le_size))){
if(apdu->lc != 0){
if((apdu->lc <= SHORT_APDU_LC_MAX) && (apdu->send_le != 2)){
/* Sanity check: Lc is encoded on 1 byte */
if(apdu_lc_size != 1){
*ret = -1;
return 0;
}
if(offset == 4){
if(size >= block_size){
/* Overflow ... this is an error */
*ret = -1;
return 0;
}
buffer[size++] = apdu->lc;
offset++;
continue;
}
if(offset > 4){
if((offset-5) >= APDU_MAX_BUFF_LEN){
/* Overflow ... this is an error */
*ret = -1;
return 0;
}
if(size >= block_size){
/* Overflow ... this is an error */
*ret = -1;
return 0;
}
buffer[size++] = apdu->data[offset-5];
offset++;
continue;
}
}
else{
/* Sanity check: Lc is encoded on 3 bytes */
if(apdu_lc_size != 3){
*ret = -1;
return 0;
}
if(offset == 4){
if(size >= block_size){
/* Overflow ... this is an error */
*ret = -1;
return 0;
}
buffer[size++] = 0;
offset++;
continue;
}
if(offset == 5){
if(size >= block_size){
/* Overflow ... this is an error */
*ret = -1;
return 0;
}
buffer[size++] = (apdu->lc >> 8) & 0xff;
offset++;
continue;
}
if(offset == 6){
if(size >= block_size){
/* Overflow ... this is an error */
*ret = -1;
return 0;
}
buffer[size++] = apdu->lc & 0xff;
offset++;
continue;
}
if(offset > 6){
if((offset-7) >= APDU_MAX_BUFF_LEN){
/* Overflow ... this is an error */
*ret = -1;
return 0;
}
if(size >= block_size){
/* Overflow ... this is an error */
*ret = -1;
return 0;
}
buffer[size++] = apdu->data[offset-7];
offset++;
continue;
}
}
}
}
/* Handle Le */
if(apdu->send_le){
if(offset >= (apdu_size - apdu_le_size)){
if(apdu_le_size == 1){
if(offset == (apdu_size-1)){
if(size >= block_size){
/* Overflow ... this is an error */
*ret = -1;
return 0;
}
buffer[size++] = apdu->le;
offset++;
continue;
}
}
if(apdu_le_size == 2){
if(offset == (apdu_size-2)){
if(size >= block_size){
/* Overflow ... this is an error */
*ret = -1;
return 0;
}
buffer[size++] = (apdu->le >> 8) & 0xff;
offset++;
continue;
}
if(offset == (apdu_size-1)){
if(size >= block_size){
/* Overflow ... this is an error */
*ret = -1;
return 0;
}
buffer[size++] = apdu->le & 0xff;
offset++;
continue;
}
}
if(apdu_le_size == 3){
if(offset == (apdu_size-3)){
if(size >= block_size){
/* Overflow ... this is an error */
*ret = -1;
return 0;
}
buffer[size++] = 0x00;
offset++;
continue;
}
if(offset == (apdu_size-2)){
if(size >= block_size){
/* Overflow ... this is an error */
*ret = -1;
return 0;
}
buffer[size++] = (apdu->le >> 8) & 0xff;
offset++;
continue;
}
if(offset == (apdu_size-1)){
if(size >= block_size){
/* Overflow ... this is an error */
*ret = -1;
return 0;
}
buffer[size++] = apdu->le & 0xff;
offset++;
continue;
}
}
}
}
}
return to_push;
}
/* Print an APDU on the console */
void SC_print_APDU(SC_APDU_cmd *apdu)
{
if(apdu == NULL){
return;
}
/* Sanity check on length */
if(apdu->lc > APDU_MAX_BUFF_LEN){
log_printf("[Smartcard] SC_print_APDU error: length %d overflow\n", apdu->lc);
return;
}
log_printf("===== APDU ============\n");
log_printf("CLA = %x, INS = %x, P1 = %x, P2 = %x\n", apdu->cla, apdu->ins, apdu->p1, apdu->p2);
if(apdu->lc != 0){
log_printf(", Lc = %x\n", apdu->lc);
if(apdu->lc > 255){
log_printf(" (extended)");
}
}
else{
log_printf(", No Lc\n");
}
if(apdu->send_le != 0){
log_printf(", Le = %x\n", apdu->le);
if((apdu->le > 256) || (apdu->send_le == 2)){
log_printf(" (extended)");
}
}
else{
log_printf(", No Le\n");
}
log_printf("\n");
hexdump(apdu->data, apdu->lc);
return;
}
/* Print a RESP on the console */
void SC_print_RESP(SC_APDU_resp *resp)
{
if(resp == NULL){
return;
}
/* Sanity check on length */
if(resp->le > APDU_MAX_BUFF_LEN){
log_printf("[Smartcard] SC_print_RESP error: length %d overflow\n", resp->le);
return;
}
log_printf("===== RESP ============\n");
log_printf("SW1 = %x, SW2 = %x, Le = %x\n", resp->sw1, resp->sw2, resp->le);
hexdump(resp->data, resp->le);
return;
}
/* Print the Card information on the console */
void SC_print_Card(SC_Card *card)
{
if(card == NULL){
goto err;
}
switch(card->type){
case SMARTCARD_CONTACT:
log_printf("===== Contact Card ============\n");
log_printf("Protocol is T = %x\n", card->T_protocol);
SC_iso7816_print_ATR(&(card->info.atr));
break;
case SMARTCARD_NFC:
case SMARTCARD_UNKNOWN:
default:
log_printf("[Smartcard] Print Cards information: Unsupported asked smartcard type %d\n", card->type);
goto err;
}
err:
return;
}
/* Abstract Send APDU/Receive response function */
int SC_send_APDU(SC_APDU_cmd *apdu, SC_APDU_resp *resp, SC_Card *card){
if((apdu == NULL) || (resp == NULL) || (card == NULL)){
goto err;
}
switch(card->type){
case SMARTCARD_CONTACT:
return SC_iso7816_send_APDU(apdu, resp, &(card->info.atr), card->T_protocol);
break;
case SMARTCARD_NFC:
case SMARTCARD_UNKNOWN:
default:
log_printf("[Smartcard] Send APDU: Unsupported asked smartcard type %d\n", card->type);
goto err;
}
return 0;
err:
return -1;
}
static volatile bool map_voluntary;
int SC_fsm_early_init(sc_map_mode_t map_mode)
{
switch (map_mode) {
case SC_MAP_AUTO:
map_voluntary = false;
/* Early init what is necessary */
if(SC_iso7816_fsm_early_init(SC_7816_MAP_AUTO)){
goto err;
}
break;
case SC_MAP_VOLUNTARY:
map_voluntary = true;
/* Early init what is necessary */
if(SC_iso7816_fsm_early_init(SC_7816_MAP_VOLUNTARY)){
goto err;
}
break;
default:
log_printf("invalid map mode\n");
goto err;
}
return 0;
err:
return -1;
}
int SC_fsm_map(void)
{
if (map_voluntary) {
return SC_iso7816_fsm_map();
}
return 0;
}
int SC_fsm_unmap(void)
{
if (map_voluntary) {
return SC_iso7816_fsm_unmap();
}
return 0;
}
int SC_fsm_init(SC_Card *card, uint8_t do_negiotiate_pts, uint8_t do_change_baud_rate, uint8_t do_force_protocol, uint32_t do_force_etu){
if(card == NULL){
return -1;
}
/* Try to init in all the modes we have, contact and then contactless */
if(SC_iso7816_fsm_init(&(card->info.atr), &(card->T_protocol), do_negiotiate_pts, do_change_baud_rate, do_force_protocol, do_force_etu) == 0){
card->type = SMARTCARD_CONTACT;
goto end;
}
else{
goto err;
}
end:
return 0;
err:
return -1;
}
void SC_smartcard_lost(SC_Card *card){
if(card == NULL){
goto err;
}
switch(card->type){
case SMARTCARD_CONTACT:
SC_iso7816_smartcard_lost();
break;
case SMARTCARD_NFC:
case SMARTCARD_UNKNOWN:
default:
log_printf("[Smartcard] Print Cards information: Unsupported asked smartcard type %d\n", card->type);
goto err;
}
err:
return;
}
uint8_t SC_is_smartcard_inserted(SC_Card *card){
int ret = 0;
if(card == NULL){
goto err;
}
switch(card->type){
case SMARTCARD_CONTACT:
ret = SC_iso7816_is_smartcard_inserted();
break;
case SMARTCARD_NFC:
case SMARTCARD_UNKNOWN:
default:
log_printf("[Smartcard] Print Cards information: Unsupported asked smartcard type %d\n", card->type);
goto err;
}
return ret;
err:
return 0;
}
int SC_wait_card_timeout(SC_Card *card){
int ret = 0;
if(card == NULL){
goto err;
}
switch(card->type){
case SMARTCARD_CONTACT:
ret = SC_iso7816_wait_card_timeout(&(card->info.atr), card->T_protocol);
break;
case SMARTCARD_NFC:
case SMARTCARD_UNKNOWN:
default:
log_printf("[Smartcard] Print Cards information: Unsupported asked smartcard type %d\n", card->type);
goto err;
}
return ret;
err:
return -1;
}
int SC_register_user_handler_action(SC_Card *card, void (*action)(void)){
if(card == NULL){
goto err;
}
switch(card->type){
case SMARTCARD_CONTACT:
SC_iso7816_register_user_handler_action(action);
break;
case SMARTCARD_NFC:
case SMARTCARD_UNKNOWN:
default:
log_printf("[Smartcard] Print Cards information: Unsupported asked smartcard type %d\n", card->type);
goto err;
}
return 0;
err:
return -1;
}