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/* apdu_dispatch - State machine to determine Rx/Tx phases of APDU
*
* (C) 2016 by Harald Welte <hwelte@hmw-consulting.de>
*
* 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
* of the License, or (at your option) any later version.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <stdio.h>
#include <errno.h>
#include <osmocom/core/utils.h>
#include <osmocom/sim/sim.h>
#include <osmocom/sim/class_tables.h>
#include "apdu_dispatch.h"
/*! \brief Has the command-data phase been completed yet? */
static inline bool is_dc_complete(struct apdu_context *ac)
{
return (ac->lc.tot == ac->lc.cur);
}
/*! \brief Has the expected-data phase been completed yet? */
static inline bool is_de_complete(struct apdu_context *ac)
{
return (ac->le.tot == ac->le.cur);
}
static const char *dump_apdu_hdr(const struct osim_apdu_cmd_hdr *h)
{
static char buf[256];
sprintf(buf, "CLA=%02x INS=%02x P1=%02x P2=%02x P3=%02x",
h->cla, h->ins, h->p1, h->p2, h->p3);
return buf;
}
static void dump_apdu_ctx(const struct apdu_context *ac)
{
printf("%s; case=%d, lc=%d(%d), le=%d(%d)\n",
dump_apdu_hdr(&ac->hdr), ac->apdu_case,
ac->lc.tot, ac->lc.cur,
ac->le.tot, ac->le.cur);
}
/*! \brief input function for APDU segmentation
* \param ac APDU context accross successive calls
* \param[in] apdu_buf APDU inpud data buffer
* \param[in] apdu_len Length of apdu_buf
* \param[in] new_apdu Is this the beginning of a new APDU?
*
* The function returns APDU_ACT_TX_CAPDU_TO_CARD once there is
* sufficient data of the APDU received to transmit the command-APDU to
* the actual card.
*
* The function retunrs APDU_ACT_RX_MORE_CAPDU_FROM_READER when there
* is more data to be received from the card reader (GSM Phone).
*/
int apdu_segment_in(struct apdu_context *ac, const uint8_t *apdu_buf,
unsigned int apdu_len, bool new_apdu)
{
int rc = 0;
if (new_apdu) {
/* initialize the apdu context structure */
memset(ac, 0, sizeof(*ac));
/* copy APDU header over */
memcpy(&ac->hdr, apdu_buf, sizeof(ac->hdr));
ac->apdu_case = osim_determine_apdu_case(&osim_uicc_sim_cic_profile, apdu_buf);
switch (ac->apdu_case) {
case 1: /* P3 == 0, No Lc/Le */
ac->le.tot = ac->lc.tot = 0;
break;
case 2: /* P3 == Le */
ac->le.tot = ac->hdr.p3;
break;
case 3: /* P3 = Lc */
ac->lc.tot = ac->hdr.p3;
/* copy Dc */
ac->lc.cur = apdu_len - sizeof(ac->hdr);
memcpy(ac->dc, apdu_buf + sizeof(ac->hdr),
ac->lc.cur);
break;
case 4: /* P3 = Lc; SW with Le */
ac->lc.tot = ac->hdr.p3;
/* copy Dc */
ac->lc.cur = apdu_len - sizeof(ac->hdr);
memcpy(ac->dc, apdu_buf + sizeof(ac->hdr),
ac->lc.cur);
break;
case 0:
default:
fprintf(stderr, "Unknown APDU case %d\n", ac->apdu_case);
return -1;
}
} else {
/* copy more data, if available */
int cpy_len;
switch (ac->apdu_case) {
case 1:
case 2:
break;
case 3:
case 4:
cpy_len = ac->lc.tot - ac->lc.cur;
if (cpy_len > apdu_len)
cpy_len = apdu_len;
memcpy(ac->dc+ac->lc.cur, apdu_buf, cpy_len);
ac->lc.cur += cpy_len;
break;
default:
fprintf(stderr, "Unknown APDU case %d\n", ac->apdu_case);
break;
}
}
/* take some decisions... */
switch (ac->apdu_case) {
case 1: /* P3 == 0, No Lc/Le */
/* send C-APDU to card */
/* receive SW from card, forward to reader */
rc |= APDU_ACT_TX_CAPDU_TO_CARD;
break;
case 2: /* P3 == Le */
/* send C-APDU to card */
/* receive Le bytes + SW from card, forward to reader */
rc |= APDU_ACT_TX_CAPDU_TO_CARD;
break;
case 3: /* P3 = Lc */
if (!is_dc_complete(ac)) {
/* send PB + read further Lc bytes from reader */
rc |= APDU_ACT_RX_MORE_CAPDU_FROM_READER;
} else {
/* send C-APDU to card */
/* receive SW from card, forward to reader */
rc |= APDU_ACT_TX_CAPDU_TO_CARD;
}
break;
case 4: /* P3 = Lc; SW with Le */
if (!is_dc_complete(ac)) {
/* send PB + read further Lc bytes from reader */
rc |= APDU_ACT_RX_MORE_CAPDU_FROM_READER;
} else {
/* send C-APDU to card */
/* receive SW from card, forward to reader */
rc |= APDU_ACT_TX_CAPDU_TO_CARD;
}
break;
case 0:
default:
fprintf(stderr, "Unknown APDU case %d\n", ac->apdu_case);
break;
}
dump_apdu_ctx(ac);
return rc;
}
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