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/*
* ISO 7816 APDU handler routines (card side)
*
* Copyright (C) 2012 Harald Welte <laforge@gnumonks.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 or
* (at your option) version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/logging.h>
#include "apdu.h"
#include "logging.h"
enum tpdu_rx_state {
T_STATE_POST_ATR,
T_STATE_WAIT_PPS,
T_STATE_WAIT_PCK,
T_STATE_WAIT_INS,
T_STATE_WAIT_P1,
T_STATE_WAIT_P2,
T_STATE_WAIT_P3,
T_STATE_POST_HDR,
T_STATE_WAIT_DATA,
T_STATE_WAIT_CLA,
};
static const struct value_string tpdu_rx_state_names[] = {
{ T_STATE_POST_ATR, "POST_ATR" },
{ T_STATE_WAIT_PPS, "WAIT_PPS" },
{ T_STATE_WAIT_PCK, "WAIT_PCK" },
{ T_STATE_WAIT_INS, "WAIT_INS" },
{ T_STATE_WAIT_P1, "WAIT_P1" },
{ T_STATE_WAIT_P2, "WAIT_P2" },
{ T_STATE_WAIT_P3, "WAIT_P3" },
{ T_STATE_POST_HDR, "POST_HDR" },
{ T_STATE_WAIT_CLA, "WAIT_CLA" },
{ 0, NULL }
};
enum tpdu_tx_state {
TX_S_IDLE,
TX_S_WAIT_PROC,
TX_S_WAIT_SW1,
TX_S_WAIT_SW2,
TX_S_WAIT_DATA,
};
static const struct value_string tpdu_tx_state_names[] = {
{ TX_S_IDLE, "IDLE" },
{ TX_S_WAIT_PROC, "WAIT_PROC" },
{ TX_S_WAIT_SW1, "WAIT_SW1" },
{ TX_S_WAIT_SW2, "WAIT_SW2" },
{ TX_S_WAIT_DATA, "WAIT_DATA" },
{ 0, NULL }
};
struct tpdu_state {
union {
struct apdu_hdr s;
uint8_t a[5];
} hdr;
struct {
uint8_t pps[4];
uint8_t pck;
uint8_t idx;
uint8_t xor_sum;
} pps;
uint16_t sw;
uint8_t proc;
enum tpdu_rx_state state;
enum tpdu_tx_state tx_state;
uint8_t tx_data_pending;
uint8_t rx_data_pending;
uint8_t buf[256];
struct apdu_parser *ap;
};
static struct tpdu_state _ts;
static void set_state(struct tpdu_state *s, enum tpdu_rx_state new)
{
DEBUGP(DPDU, "RX State change %s -> %s\n",
get_value_string(tpdu_rx_state_names, s->state),
get_value_string(tpdu_rx_state_names, new));
s->state = new;
if (s->state == T_STATE_POST_ATR) {
memset(&s->hdr, sizeof(s->hdr), 0);
memset(&s->pps, sizeof(s->hdr), 0);
}
}
static void set_tx_state(struct tpdu_state *s, enum tpdu_tx_state new)
{
DEBUGP(DPDU, "TX State change %s -> %s\n",
get_value_string(tpdu_tx_state_names, s->tx_state),
get_value_string(tpdu_tx_state_names, new));
s->tx_state = new;
if (s->tx_state == TX_S_IDLE) {
s->tx_data_pending = 0;
memset(&s->hdr, sizeof(s->hdr), 0);
memset(&s->pps, sizeof(s->hdr), 0);
}
}
static void tpdu_rx_byte(struct tpdu_state *ts, uint8_t byte)
{
int rc;
switch (ts->state) {
case T_STATE_POST_ATR:
if (byte == 0xFF)
set_state(ts, T_STATE_WAIT_PPS);
else {
ts->hdr.s.cla = byte;
set_state(ts, T_STATE_WAIT_INS);
}
break;
case T_STATE_WAIT_INS:
ts->hdr.s.ins = byte;
set_state(ts, T_STATE_WAIT_P1);
break;
case T_STATE_WAIT_P1:
ts->hdr.s.p1 = byte;
set_state(ts, T_STATE_WAIT_P2);
break;
case T_STATE_WAIT_P2:
ts->hdr.s.p2 = byte;
set_state(ts, T_STATE_WAIT_P3);
break;
case T_STATE_WAIT_P3:
ts->hdr.s.p3 = byte;
set_state(ts, T_STATE_POST_HDR);
/* FIXME: set-up automatic WTX timer */
/* FIXME: call APDU dispatcher */
rc = apdu_handle_hdr(ts->ap, &ts->hdr.s);
switch (rc >> 24) {
case RC_SW:
ts->sw = rc & 0xffff;
set_tx_state(ts, TX_S_WAIT_SW1);
set_state(ts, T_STATE_WAIT_CLA);
break;
case RC_PROC_RX:
/* procedure byte */
ts->proc = rc & 0xff;
set_tx_state(ts, TX_S_WAIT_PROC);
//ts->rx_data_len = (rc >> 8) & 0xff;
set_state(ts, T_STATE_WAIT_DATA);
break;
case RC_PROC_TX:
/* procedure byte */
set_tx_state(ts, TX_S_WAIT_PROC);
//ts->rx_data_len = (rc >> 8) & 0xff;
set_state(ts, T_STATE_WAIT_CLA);
break;
}
break;
case T_STATE_WAIT_PPS:
ts->pps.pps[ts->pps.idx++] = byte;
ts->pps.xor_sum ^= byte;
switch (ts->pps.idx) {
case 1:
if (!(ts->pps.pps[0] & 0x10))
set_state(ts, T_STATE_WAIT_PCK);
break;
case 2:
if (!(ts->pps.pps[0] & 0x20))
set_state(ts, T_STATE_WAIT_PCK);
break;
case 3:
if (!(ts->pps.pps[0] & 0x40))
set_state(ts, T_STATE_WAIT_PCK);
/* otherwise: stay in T_STATE_WAIT_PPS */
break;
default:
set_state(ts, T_STATE_WAIT_PCK);
}
break;
case T_STATE_WAIT_PCK:
if (byte != ts->pps.xor_sum) {
/* checksum mismatch ! */
while (1) {}
}
/* FIXME: check if protocol is supported */
//proto = ts->pps.pps[0] & 0x0f;
break;
}
}
/* pull one byte out of the TPDU transmit state machine, negative if thre is
* none */
static int tpdu_tx_pull(struct tpdu_state *ts)
{
int rc = -2;
switch (ts->tx_state) {
case TX_S_IDLE:
rc = -1;
break;
case TX_S_WAIT_PROC:
rc = ts->proc;
if (ts->tx_data_pending)
set_tx_state(ts, TX_S_WAIT_DATA);
else
set_tx_state(ts, TX_S_IDLE);
break;
case TX_S_WAIT_SW1:
rc = ts->sw >> 8;
set_tx_state(ts, TX_S_WAIT_SW2);
break;
case TX_S_WAIT_SW2:
rc = ts->sw & 0xff;
set_tx_state(ts, TX_S_IDLE);
break;
case TX_S_WAIT_DATA:
rc = ts->buf[ts->tx_data_pending--];
if (!ts->tx_data_pending)
set_tx_state(ts, TX_S_IDLE);
break;
}
return rc;
}
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