/*

 * card-skeid.c: Support for (CardOS based) cards issued as identity documents in Slovakia

 *

 * Copyright (C) 2022 Juraj Šarinay <juraj@sarinay.com>

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This library 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 *

 * based on card-cardos.c

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <string.h>

#include "internal.h"

#define SKEID_KNOWN_URL_LEN 46

static const struct sc_card_operations *iso_ops = NULL;

static struct sc_card_operations skeid_ops;

static struct sc_card_driver skeid_drv = {

  "Slovak eID card",

  "skeid",

  &skeid_ops,

  NULL, 0, NULL

};

static const struct sc_atr_table skeid_atrs[] = {

  /* Slovak eID v3 - CardOS 5.4

   *

   * The ATR was intentionally omitted from minidriver_registration[] within win32/customactions.cpp

   * as it is identical to that of CardOS v5.4 and therefore already included.

   * Any new ATR may need an entry in minidriver_registration[]. */

  {"3b:d2:18:00:81:31:fe:58:c9:04:11", NULL, NULL, SC_CARD_TYPE_SKEID_V3, 0, NULL},

  {NULL, NULL, NULL, 0, 0, NULL}

};

static int skeid_known_url(sc_card_t * card)

{

  const struct sc_aid skeid_aid_eid = {{0xE8, 0x07, 0x04, 0x00, 0x7F, 0x00, 0x07, 0x03, 0x02}, 9};

  const char *known_url = "\x80\x01\x00\x5F\x50\x28http://www.minv.sk/cif/cif-sk-eid-v3.xml";

  u8 buf[SKEID_KNOWN_URL_LEN];

  sc_path_t url_path;

  int r = SC_ERROR_WRONG_CARD;

  sc_path_set(&url_path, SC_PATH_TYPE_DF_NAME, skeid_aid_eid.value, skeid_aid_eid.len, 0, 0);

  if (sc_select_file(card, &url_path, NULL) == SC_SUCCESS

    && sc_get_data(card, 0x7F62, buf, SKEID_KNOWN_URL_LEN) == SKEID_KNOWN_URL_LEN

    && !memcmp(buf, known_url, SKEID_KNOWN_URL_LEN))

    r = SC_SUCCESS;

  return r;

}

static int skeid_match_card(sc_card_t *card)

{

  if (_sc_match_atr(card, skeid_atrs, &card->type) < 0 || skeid_known_url(card) != SC_SUCCESS)

    return 0;

  sc_log(card->ctx,  "Slovak eID card v3 (CardOS 5.4)");

  return 1;

}

static int skeid_get_serialnr(sc_card_t *card)

{

  int r;

  sc_apdu_t apdu;

  u8 rbuf[SC_MAX_APDU_BUFFER_SIZE];

  sc_format_apdu(card, &apdu, SC_APDU_CASE_2_SHORT, 0xca, 0x01, 0x81);

  apdu.resp = rbuf;

  apdu.resplen = sizeof(rbuf);

  apdu.le = 256;

  r = sc_transmit_apdu(card, &apdu);

  LOG_TEST_RET(card->ctx, r, "APDU transmit failed");

  if (apdu.sw1 != 0x90 || apdu.sw2 != 0x00)

    return SC_ERROR_INTERNAL;

  if (apdu.resplen == 8) {

    /* cache serial number */

    memcpy(card->serialnr.value, rbuf, 8);

    card->serialnr.len = 8;

  } else {

    sc_log(card->ctx, "unexpected response to GET DATA serial number");

    return SC_ERROR_INTERNAL;

  }

  return SC_SUCCESS;

}

static int skeid_init(sc_card_t *card)

{

  const unsigned long flags = SC_ALGORITHM_RSA_PAD_PKCS1 | SC_ALGORITHM_RSA_HASH_NONE;

  const size_t data_field_length = 437;

  int r;

  SC_FUNC_CALLED(card->ctx, SC_LOG_DEBUG_VERBOSE);

  card->name = "Slovak eID (CardOS)";

  card->type = SC_CARD_TYPE_SKEID_V3;

  card->cla = 0x00;

  r = skeid_get_serialnr(card);

  LOG_TEST_RET(card->ctx, r, "Error reading serial number.");

  card->caps |= SC_CARD_CAP_APDU_EXT | SC_CARD_CAP_ISO7816_PIN_INFO;

  card->max_send_size = data_field_length - 6;

#ifdef _WIN32

  /* see card-cardos.c */

  if (card->reader->max_send_size == 255 && card->reader->max_recv_size == 256) {

    sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "resetting reader to use data_field_length");

    card->reader->max_send_size = data_field_length - 6;

    card->reader->max_recv_size = data_field_length - 3;

  }

#endif

  card->max_send_size = sc_get_max_send_size(card); /* see card-cardos.c */

  card->max_recv_size = data_field_length - 2;

  card->max_recv_size = sc_get_max_recv_size(card);

  r = _sc_card_add_rsa_alg(card, 3072, flags, 0);

  LOG_FUNC_RETURN(card->ctx, r);

}

static int skeid_set_security_env(sc_card_t *card,

    const sc_security_env_t *env,

    int se_num)

{

  int key_id;

  int r;

  if (card == NULL || env == NULL)

    return SC_ERROR_INTERNAL;

  if (!(env->flags & SC_SEC_ENV_KEY_REF_PRESENT) || env->key_ref_len != 1) {

    sc_log(card->ctx, "No or invalid key reference");

    return SC_ERROR_INVALID_ARGUMENTS;

  }

  /* here we follow the behaviour of the proprietary driver accompanying the card

   * where security operations are preceded by MSE RESTORE rather than MSE SET

   */

  key_id = env->key_ref[0];

  r = sc_restore_security_env(card, key_id);

  return r;

}

static int skeid_logout(sc_card_t *card)

{

  int r;

  sc_path_t path;

  sc_format_path("3F00", &path);

  r = sc_select_file(card, &path, NULL);

  return r;

}

struct sc_card_driver * sc_get_skeid_driver(void)

{

  if (iso_ops == NULL) iso_ops = sc_get_iso7816_driver()->ops;

  skeid_ops = *iso_ops;

  skeid_ops.match_card = skeid_match_card;

  skeid_ops.init = skeid_init;

  skeid_ops.set_security_env = skeid_set_security_env;

  skeid_ops.logout = skeid_logout;

  return &skeid_drv;

}