/*

 * pkcs15-pin.c: PKCS #15 PIN functions

 *

 * Copyright (C) 2001, 2002  Juha Yrjölä <juha.yrjola@iki.fi>

 *

 * 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

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <assert.h>

#include <string.h>

#include <stdlib.h>

#include <stdio.h>

#include "internal.h"

#include "asn1.h"

#include "pkcs15.h"

#include "ui/notify.h"

int _sc_pkcs15_verify_pin(struct sc_pkcs15_card *, struct sc_pkcs15_object *,

    const unsigned char *, size_t);

static const struct sc_asn1_entry c_asn1_com_ao_attr[] = {

  { "authId",       SC_ASN1_PKCS15_ID, SC_ASN1_TAG_OCTET_STRING, 0, NULL, NULL },

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

};

/* PIN attributes */

static const struct sc_asn1_entry c_asn1_pin_attr[] = {

  { "pinFlags",   SC_ASN1_BIT_FIELD, SC_ASN1_TAG_BIT_STRING, 0, NULL, NULL },

  { "pinType",      SC_ASN1_ENUMERATED, SC_ASN1_TAG_ENUMERATED, 0, NULL, NULL },

  { "minLength",    SC_ASN1_INTEGER, SC_ASN1_TAG_INTEGER, 0, NULL, NULL },

  { "storedLength", SC_ASN1_INTEGER, SC_ASN1_TAG_INTEGER, 0, NULL, NULL },

  { "maxLength",    SC_ASN1_INTEGER, SC_ASN1_TAG_INTEGER, SC_ASN1_OPTIONAL, NULL, NULL },

  { "pinReference", SC_ASN1_INTEGER, SC_ASN1_CTX | 0, SC_ASN1_OPTIONAL, NULL, NULL },

  { "padChar",      SC_ASN1_OCTET_STRING, SC_ASN1_TAG_OCTET_STRING, SC_ASN1_OPTIONAL, NULL, NULL },

  { "lastPinChange",SC_ASN1_GENERALIZEDTIME, SC_ASN1_TAG_GENERALIZEDTIME, SC_ASN1_OPTIONAL, NULL, NULL },

  { "path",         SC_ASN1_PATH, SC_ASN1_TAG_SEQUENCE | SC_ASN1_CONS, SC_ASN1_OPTIONAL, NULL, NULL },

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

};

static const struct sc_asn1_entry c_asn1_type_pin_attr[] = {

  { "pinAttributes", SC_ASN1_STRUCT, SC_ASN1_TAG_SEQUENCE | SC_ASN1_CONS, 0, NULL, NULL },

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

};

/* Auth Key attributes */

static const struct sc_asn1_entry c_asn1_authkey_attr[] = {

  { "derivedKey", SC_ASN1_BOOLEAN, SC_ASN1_TAG_BOOLEAN, SC_ASN1_OPTIONAL, NULL, NULL },

  { "authKeyId",  SC_ASN1_PKCS15_ID, SC_ASN1_TAG_OCTET_STRING, 0, NULL, NULL },

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

};

static const struct sc_asn1_entry c_asn1_type_authkey_attr[] = {

  { "authKeyAttributes",  SC_ASN1_STRUCT, SC_ASN1_TAG_SEQUENCE | SC_ASN1_CONS, 0, NULL, NULL },

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

};

static const struct sc_asn1_entry c_asn1_auth_type[] = {

  { "authType",      SC_ASN1_CHOICE, 0, 0, NULL, NULL },

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

};

static const struct sc_asn1_entry c_asn1_auth_type_choice[] = {

  { "pin", SC_ASN1_PKCS15_OBJECT, SC_ASN1_TAG_SEQUENCE | SC_ASN1_CONS, SC_ASN1_OPTIONAL, NULL, NULL },

  { "biometricTemplate", SC_ASN1_PKCS15_OBJECT,  SC_ASN1_CTX | 0 | SC_ASN1_CONS, SC_ASN1_OPTIONAL, NULL, NULL },

  { "authKey", SC_ASN1_PKCS15_OBJECT,  SC_ASN1_CTX | 1 | SC_ASN1_CONS, SC_ASN1_OPTIONAL, NULL, NULL },

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

};

int

sc_pkcs15_decode_aodf_entry(struct sc_pkcs15_card *p15card, struct sc_pkcs15_object *obj,

    const u8 ** buf, size_t *buflen)

{

  sc_context_t *ctx = p15card->card->ctx;

  struct sc_pkcs15_auth_info info;

  int r;

  size_t flags_len = sizeof(info.attrs.pin.flags);

  size_t derived_len = sizeof(info.attrs.authkey.derived);

  size_t padchar_len = 1;

  struct sc_asn1_entry asn1_com_ao_attr[2];

  struct sc_asn1_entry asn1_pin_attr[10], asn1_type_pin_attr[2];

  struct sc_asn1_entry asn1_authkey_attr[3], asn1_type_authkey_attr[2];

  struct sc_asn1_entry asn1_auth_type[2];

  struct sc_asn1_entry asn1_auth_type_choice[4];

  struct sc_asn1_pkcs15_object pin_obj = { obj, asn1_com_ao_attr, NULL, asn1_type_pin_attr };

  struct sc_asn1_pkcs15_object authkey_obj = { obj, asn1_com_ao_attr, NULL, asn1_type_authkey_attr };

  SC_FUNC_CALLED(ctx, SC_LOG_DEBUG_ASN1);

  sc_copy_asn1_entry(c_asn1_auth_type, asn1_auth_type);

  sc_copy_asn1_entry(c_asn1_auth_type_choice, asn1_auth_type_choice);

  sc_copy_asn1_entry(c_asn1_com_ao_attr, asn1_com_ao_attr);

  sc_copy_asn1_entry(c_asn1_type_pin_attr, asn1_type_pin_attr);

  sc_copy_asn1_entry(c_asn1_pin_attr, asn1_pin_attr);

  sc_copy_asn1_entry(c_asn1_type_authkey_attr, asn1_type_authkey_attr);

  sc_copy_asn1_entry(c_asn1_authkey_attr, asn1_authkey_attr);

  sc_format_asn1_entry(asn1_auth_type + 0, asn1_auth_type_choice, NULL, 0);

  sc_format_asn1_entry(asn1_auth_type_choice + 0, &pin_obj, NULL, 0); /* 'pin' */

  sc_format_asn1_entry(asn1_auth_type_choice + 2, &authkey_obj, NULL, 0); /* 'authKey' */

  /* pinAttributes */

  sc_format_asn1_entry(asn1_type_pin_attr + 0, asn1_pin_attr, NULL, 0);

  sc_format_asn1_entry(asn1_pin_attr + 0, &info.attrs.pin.flags, &flags_len, 0);

  sc_format_asn1_entry(asn1_pin_attr + 1, &info.attrs.pin.type, NULL, 0);

  sc_format_asn1_entry(asn1_pin_attr + 2, &info.attrs.pin.min_length, NULL, 0);

  sc_format_asn1_entry(asn1_pin_attr + 3, &info.attrs.pin.stored_length, NULL, 0);

  sc_format_asn1_entry(asn1_pin_attr + 4, &info.attrs.pin.max_length, NULL, 0);

  sc_format_asn1_entry(asn1_pin_attr + 5, &info.attrs.pin.reference, NULL, 0);

  sc_format_asn1_entry(asn1_pin_attr + 6, &info.attrs.pin.pad_char, &padchar_len, 0);

  /* authKeyAttributes */

  sc_format_asn1_entry(asn1_type_authkey_attr + 0, asn1_authkey_attr, NULL, 0);

  sc_format_asn1_entry(asn1_authkey_attr + 0, &info.attrs.authkey.derived, &derived_len, 0);

  sc_format_asn1_entry(asn1_authkey_attr + 1, &info.attrs.authkey.skey_id, NULL, 0);

  /* We don't support lastPinChange yet. */

  sc_format_asn1_entry(asn1_pin_attr + 8, &info.path, NULL, 0);

  sc_format_asn1_entry(asn1_com_ao_attr + 0, &info.auth_id, NULL, 0);

  /* Fill in defaults */

  memset(&info, 0, sizeof(info));

  info.tries_left = -1;

  info.logged_in = SC_PIN_STATE_UNKNOWN;

  r = sc_asn1_decode(ctx, asn1_auth_type, *buf, *buflen, buf, buflen);

  if (r == SC_ERROR_ASN1_END_OF_CONTENTS)

    return r;

  LOG_TEST_RET(ctx, r, "ASN.1 decoding failed");

  if (asn1_auth_type_choice[0].flags & SC_ASN1_PRESENT)   {

    sc_log(ctx, "AuthType: PIN");

    obj->type = SC_PKCS15_TYPE_AUTH_PIN;

    info.auth_type = SC_PKCS15_PIN_AUTH_TYPE_PIN;

    info.auth_method = SC_AC_CHV;

    if (info.attrs.pin.max_length == 0) {

      if (p15card->card->max_pin_len != 0)

        info.attrs.pin.max_length = p15card->card->max_pin_len;

      else if (info.attrs.pin.stored_length != 0)

        info.attrs.pin.max_length = info.attrs.pin.type != SC_PKCS15_PIN_TYPE_BCD ?

          info.attrs.pin.stored_length : 2 * info.attrs.pin.stored_length;

      else

        info.attrs.pin.max_length = 8; /* shouldn't happen */

    }

    /* OpenSC 0.11.4 and older encoded "pinReference" as a negative

       value. Fixed in 0.11.5 we need to add a hack, so old cards

       continue to work.

       The same invalid encoding has some models of the proprietary PKCS#15 cards.

    */

    if (info.attrs.pin.reference < 0)

      info.attrs.pin.reference += 256;

    if (info.attrs.pin.flags & SC_PKCS15_PIN_FLAG_LOCAL)   {

      /* In OpenSC pkcs#15 framework 'path' is mandatory for the 'Local' PINs.

       * If 'path' do not present in PinAttributes, derive it from the PKCS#15 context. */

      if (!info.path.len)   {

        /* Give priority to AID defined in the application DDO */

        if (p15card->app && p15card->app->ddo.aid.len)

          info.path.aid = p15card->app->ddo.aid;

        else if (p15card->file_app && p15card->file_app->path.len)

          info.path = p15card->file_app->path;

        else

          return SC_ERROR_INTERNAL;

      }

    }

    sc_debug(ctx, SC_LOG_DEBUG_ASN1, "decoded PIN(ref:%X,path:%s)", info.attrs.pin.reference, sc_print_path(&info.path));

  }

  else if (asn1_auth_type_choice[1].flags & SC_ASN1_PRESENT)   {

    LOG_TEST_RET(ctx, SC_ERROR_NOT_SUPPORTED, "BIO authentication object not yet supported");

  }

  else if (asn1_auth_type_choice[2].flags & SC_ASN1_PRESENT)   {

    sc_log(ctx, "AuthType: AuthKey");

    obj->type = SC_PKCS15_TYPE_AUTH_AUTHKEY;

    info.auth_type = SC_PKCS15_PIN_AUTH_TYPE_AUTH_KEY;

    info.auth_method = SC_AC_AUT;

    if (!(asn1_authkey_attr[0].flags & SC_ASN1_PRESENT))

      info.attrs.authkey.derived = 1;

  }

  else   {

    LOG_TEST_RET(ctx, SC_ERROR_NOT_SUPPORTED, "unknown authentication type");

  }

  obj->data = malloc(sizeof(info));

  if (obj->data == NULL)

    LOG_FUNC_RETURN(ctx, SC_ERROR_OUT_OF_MEMORY);

  memcpy(obj->data, &info, sizeof(info));

  SC_FUNC_RETURN(ctx, SC_LOG_DEBUG_ASN1, SC_SUCCESS);

}

int sc_pkcs15_encode_aodf_entry(sc_context_t *ctx,

         const struct sc_pkcs15_object *obj,

         u8 **buf, size_t *buflen)

{

  struct sc_asn1_entry asn1_com_ao_attr[2], asn1_pin_attr[10], asn1_type_pin_attr[2];

  struct sc_asn1_entry asn1_auth_type[2];

  struct sc_asn1_entry asn1_auth_type_choice[4];

  struct sc_pkcs15_auth_info *info = (struct sc_pkcs15_auth_info *) obj->data;

  struct sc_asn1_pkcs15_object pin_obj = { (struct sc_pkcs15_object *) obj,

             asn1_com_ao_attr, NULL, asn1_type_pin_attr };

  int r;

  size_t flags_len;

  size_t padchar_len = 1;

  if (info->auth_type != SC_PKCS15_PIN_AUTH_TYPE_PIN)

    return SC_ERROR_NOT_SUPPORTED;

  sc_copy_asn1_entry(c_asn1_auth_type, asn1_auth_type);

  sc_copy_asn1_entry(c_asn1_auth_type_choice, asn1_auth_type_choice);

  sc_copy_asn1_entry(c_asn1_type_pin_attr, asn1_type_pin_attr);

  sc_copy_asn1_entry(c_asn1_pin_attr, asn1_pin_attr);

  sc_copy_asn1_entry(c_asn1_com_ao_attr, asn1_com_ao_attr);

  sc_format_asn1_entry(asn1_auth_type + 0, asn1_auth_type_choice, NULL, 1);

  sc_format_asn1_entry(asn1_auth_type_choice + 0, &pin_obj, NULL, 1);

  sc_format_asn1_entry(asn1_type_pin_attr + 0, asn1_pin_attr, NULL, 1);

  flags_len = sizeof(info->attrs.pin.flags);

  sc_format_asn1_entry(asn1_pin_attr + 0, &info->attrs.pin.flags, &flags_len, 1);

  sc_format_asn1_entry(asn1_pin_attr + 1, &info->attrs.pin.type, NULL, 1);

  sc_format_asn1_entry(asn1_pin_attr + 2, &info->attrs.pin.min_length, NULL, 1);

  sc_format_asn1_entry(asn1_pin_attr + 3, &info->attrs.pin.stored_length, NULL, 1);

  if (info->attrs.pin.max_length > 0)

    sc_format_asn1_entry(asn1_pin_attr + 4, &info->attrs.pin.max_length, NULL, 1);

  if (info->attrs.pin.reference >= 0)

    sc_format_asn1_entry(asn1_pin_attr + 5, &info->attrs.pin.reference, NULL, 1);

  /* FIXME: check if pad_char present */

  sc_format_asn1_entry(asn1_pin_attr + 6, &info->attrs.pin.pad_char, &padchar_len, 1);

  sc_format_asn1_entry(asn1_pin_attr + 8, &info->path, NULL, info->path.len ? 1 : 0);

  sc_format_asn1_entry(asn1_com_ao_attr + 0, &info->auth_id, NULL, 1);

  r = sc_asn1_encode(ctx, asn1_auth_type, buf, buflen);

  return r;

}

static int

_validate_pin(struct sc_pkcs15_card *p15card, struct sc_pkcs15_auth_info *auth_info, size_t pinlen)

{

  size_t max_length;

  if (p15card == NULL) {

    return SC_ERROR_INVALID_ARGUMENTS;

  }

  /* Ignore validation of the non-PIN authentication objects */

  if (auth_info->auth_type != SC_PKCS15_PIN_AUTH_TYPE_PIN)

    return SC_SUCCESS;

  /* prevent buffer overflow from hostile card */

  if (auth_info->attrs.pin.stored_length > SC_MAX_PIN_SIZE)

    return SC_ERROR_BUFFER_TOO_SMALL;

  /* if we use pinpad, no more checks are needed */

  if ((p15card->card->reader->capabilities & SC_READER_CAP_PIN_PAD

        || p15card->card->caps & SC_CARD_CAP_PROTECTED_AUTHENTICATION_PATH)

        && !pinlen)

    return SC_SUCCESS;

  /* If pin is given, make sure it is within limits */

  max_length = auth_info->attrs.pin.max_length != 0 ? auth_info->attrs.pin.max_length : SC_MAX_PIN_SIZE;

  if (pinlen > max_length || pinlen < auth_info->attrs.pin.min_length)

    return SC_ERROR_INVALID_PIN_LENGTH;

  return SC_SUCCESS;

}

/*

 * Verify a PIN.

 *

 * If the code given to us has zero length, this means we

 * should ask the card reader to obtain the PIN from the

 * reader's PIN pad

 */

int

sc_pkcs15_verify_pin(struct sc_pkcs15_card *p15card, struct sc_pkcs15_object *pin_obj,

    const unsigned char *pincode, size_t pinlen)

{

  struct sc_context *ctx = p15card->card->ctx;

  struct sc_pkcs15_auth_info *auth_info;

  int r;

  LOG_FUNC_CALLED(ctx);

  if (!pin_obj || !pin_obj->data)

    LOG_FUNC_RETURN(ctx, SC_ERROR_INVALID_PIN_REFERENCE);

  auth_info = (struct sc_pkcs15_auth_info *)pin_obj->data;

  /* Check the provided pin matches pin requirements */

  r = _validate_pin(p15card, auth_info, pinlen);

  if (r)

    LOG_FUNC_RETURN(ctx, r);

  r = _sc_pkcs15_verify_pin(p15card, pin_obj, pincode, pinlen);

  if (r == SC_SUCCESS)

    sc_pkcs15_pincache_add(p15card, pin_obj, pincode, pinlen);

  LOG_FUNC_RETURN(ctx, r);

}

int

_sc_pkcs15_verify_pin(struct sc_pkcs15_card *p15card, struct sc_pkcs15_object *pin_obj,

    const unsigned char *pincode, size_t pinlen)

{

  return sc_pkcs15_verify_pin_with_session_pin(p15card, pin_obj, pincode,

      pinlen, NULL, NULL);

}

/*

 * Verify a PIN and generate a session PIN

 *

 * If the code given to us has zero length, this means we

 * should ask the card reader to obtain the PIN from the

 * reader's PIN pad

 */

int sc_pkcs15_verify_pin_with_session_pin(struct sc_pkcs15_card *p15card,

       struct sc_pkcs15_object *pin_obj,

       const unsigned char *pincode, size_t pinlen,

       const unsigned char *sessionpin, size_t *sessionpinlen)

{

  struct sc_context *ctx = p15card->card->ctx;

  struct sc_pkcs15_auth_info *auth_info = (struct sc_pkcs15_auth_info *)pin_obj->data;

  int r;

  sc_card_t *card;

  struct sc_pin_cmd_data data;

  LOG_FUNC_CALLED(ctx);

  sc_log(ctx,

         "PIN(type:%X; method:%X; value(%p:%"SC_FORMAT_LEN_SIZE_T"u)",

         auth_info->auth_type, auth_info->auth_method,

         pincode, pinlen);

  card = p15card->card;

  if (pinlen > SC_MAX_PIN_SIZE) {

    sc_notify_id(card->ctx, &card->reader->atr, p15card,

        NOTIFY_PIN_BAD);

    LOG_TEST_RET(ctx, SC_ERROR_INVALID_PIN_LENGTH, "Invalid PIN size");

  }

  /* Initialize arguments */

  memset(&data, 0, sizeof(data));

  data.pin_type = auth_info->auth_method;

  if (auth_info->auth_type == SC_PKCS15_PIN_AUTH_TYPE_PIN)   {

    data.pin_reference = auth_info->attrs.pin.reference;

    data.pin1.min_length = auth_info->attrs.pin.min_length;

    data.pin1.max_length = auth_info->attrs.pin.max_length;

    data.pin1.pad_length = auth_info->attrs.pin.stored_length;

    data.pin1.pad_char = auth_info->attrs.pin.pad_char;

    data.pin1.data = pincode;

    data.pin1.len = pinlen;

    if (auth_info->attrs.pin.flags & SC_PKCS15_PIN_FLAG_NEEDS_PADDING)

      data.flags |= SC_PIN_CMD_NEED_PADDING;

    switch (auth_info->attrs.pin.type) {

    case SC_PKCS15_PIN_TYPE_BCD:

      data.pin1.encoding = SC_PIN_ENCODING_BCD;

      break;

    case SC_PKCS15_PIN_TYPE_ASCII_NUMERIC:

      data.pin1.encoding = SC_PIN_ENCODING_ASCII;

      break;

    default:

      /* assume/hope the card driver knows how to encode the pin */

      data.pin1.encoding = 0;

    }

  }

  else if (auth_info->auth_type == SC_PKCS15_PIN_AUTH_TYPE_AUTH_KEY)   {

    struct sc_pkcs15_object *skey_obj = NULL;

    struct sc_pkcs15_id *skey_id =  &auth_info->attrs.authkey.skey_id;

    struct sc_pkcs15_skey_info *skey_info = NULL;

    r = sc_pkcs15_find_skey_by_id(p15card, skey_id, &skey_obj);

    if (r)   {

      sc_log(ctx, "cannot find secret key with id:%s", sc_pkcs15_print_id(skey_id));

      LOG_FUNC_RETURN(ctx, r);

    }

    skey_info = (struct sc_pkcs15_skey_info *)skey_obj->data;

    sc_log(ctx, "found secret key '%s'", skey_obj->label);

    data.pin_reference = skey_info->key_reference;

  }

  if ((p15card->card->reader->capabilities & SC_READER_CAP_PIN_PAD

        || p15card->card->caps & SC_CARD_CAP_PROTECTED_AUTHENTICATION_PATH)) {

    if (!pincode && !pinlen)

      data.flags |= SC_PIN_CMD_USE_PINPAD;

    if (auth_info->attrs.pin.flags & SC_PKCS15_PIN_FLAG_SO_PIN)

      data.pin1.prompt = "Please enter SO PIN";

    else

      data.pin1.prompt = "Please enter PIN";

  }

  if (card->caps & SC_CARD_CAP_SESSION_PIN && sessionpin && sessionpinlen) {

    /* session pin is requested and supported with standard verification*/

    data.cmd = SC_PIN_CMD_GET_SESSION_PIN;

    memcpy(&data.pin2, &data.pin1, sizeof (data.pin1));

    data.pin2.data = sessionpin;

    data.pin2.len = *sessionpinlen;

  } else {

    /* perform a standard verify */

    data.cmd = SC_PIN_CMD_VERIFY;

    if (sessionpinlen)

      *sessionpinlen = 0;

  }

  r = sc_lock(card);

  LOG_TEST_RET(ctx, r, "sc_lock() failed");

  /* the path in the pin object is optional */

  if ((auth_info->path.len > 0) || ((auth_info->path.aid.len > 0))) {

    r = sc_select_file(card, &auth_info->path, NULL);

    if (r)

      goto out;

  }

  r = sc_pin_cmd(card, &data, &auth_info->tries_left);

  sc_log(ctx, "PIN cmd result %i", r);

  if (r == SC_SUCCESS) {

    sc_pkcs15_pincache_add(p15card, pin_obj, pincode, pinlen);

    if (data.cmd == SC_PIN_CMD_GET_SESSION_PIN && sessionpinlen) {

      *sessionpinlen = data.pin2.len;

    }

  } else {

    sc_notify_id(card->ctx, &card->reader->atr, p15card,

        NOTIFY_PIN_BAD);

    if (data.cmd == SC_PIN_CMD_GET_SESSION_PIN && sessionpinlen) {

      *sessionpinlen = 0;

    }

  }

  if (auth_info->auth_type == SC_PKCS15_PIN_AUTH_TYPE_PIN

      && auth_info->auth_method != SC_AC_SESSION) {

    sc_notify_id(card->ctx, &card->reader->atr, p15card,

        r == SC_SUCCESS ? NOTIFY_PIN_GOOD : NOTIFY_PIN_BAD);

  }

out:

  sc_unlock(card);

  LOG_FUNC_RETURN(ctx, r);

}

/*

 * Change a PIN.

 */

int sc_pkcs15_change_pin(struct sc_pkcs15_card *p15card,

       struct sc_pkcs15_object *pin_obj,

       const u8 *oldpin, size_t oldpinlen,

       const u8 *newpin, size_t newpinlen)

{

  struct sc_context *ctx = p15card->card->ctx;

  struct sc_pin_cmd_data data;

  struct sc_pkcs15_auth_info *auth_info = (struct sc_pkcs15_auth_info *)pin_obj->data;

  struct sc_card *card;

  int r;

  LOG_FUNC_CALLED(ctx);

  if (auth_info->auth_type != SC_PKCS15_PIN_AUTH_TYPE_PIN)

    LOG_FUNC_RETURN(ctx, SC_ERROR_NOT_SUPPORTED);

  /* make sure the pins are in valid range */

  r = _validate_pin(p15card, auth_info, oldpinlen);

  LOG_TEST_RET(ctx, r, "Old PIN value do not conform PIN policy");

  r = _validate_pin(p15card, auth_info, newpinlen);

  LOG_TEST_RET(ctx, r, "New PIN value do not conform PIN policy");

  card = p15card->card;

  r = sc_lock(card);

  LOG_TEST_RET(ctx, r, "sc_lock() failed");

  /* the path in the pin object is optional */

  if ((auth_info->path.len > 0) || ((auth_info->path.aid.len > 0))) {

    r = sc_select_file(card, &auth_info->path, NULL);

    if (r)

      goto out;

  }

  /* set pin_cmd data */

  memset(&data, 0, sizeof(data));

  data.cmd             = SC_PIN_CMD_CHANGE;

  data.pin_type        = SC_AC_CHV;

  data.pin_reference   = auth_info->attrs.pin.reference;

  data.pin1.data       = oldpin;

  data.pin1.len        = oldpinlen;

  data.pin1.pad_char   = auth_info->attrs.pin.pad_char;

  data.pin1.min_length = auth_info->attrs.pin.min_length;

  data.pin1.max_length = auth_info->attrs.pin.max_length;

  data.pin1.pad_length = auth_info->attrs.pin.stored_length;

  data.pin2.data       = newpin;

  data.pin2.len        = newpinlen;

  data.pin2.pad_char   = auth_info->attrs.pin.pad_char;

  data.pin2.min_length = auth_info->attrs.pin.min_length;

  data.pin2.max_length = auth_info->attrs.pin.max_length;

  data.pin2.pad_length = auth_info->attrs.pin.stored_length;

  if (auth_info->attrs.pin.flags & SC_PKCS15_PIN_FLAG_NEEDS_PADDING)

    data.flags |= SC_PIN_CMD_NEED_PADDING;

  switch (auth_info->attrs.pin.type) {

  case SC_PKCS15_PIN_TYPE_BCD:

    data.pin1.encoding = SC_PIN_ENCODING_BCD;

    data.pin2.encoding = SC_PIN_ENCODING_BCD;

    break;

  case SC_PKCS15_PIN_TYPE_ASCII_NUMERIC:

    data.pin1.encoding = SC_PIN_ENCODING_ASCII;

    data.pin2.encoding = SC_PIN_ENCODING_ASCII;

    break;

  }

  if((!oldpin || !newpin)

      && (p15card->card->reader->capabilities & SC_READER_CAP_PIN_PAD

        || p15card->card->caps & SC_CARD_CAP_PROTECTED_AUTHENTICATION_PATH)) {

    data.flags |= SC_PIN_CMD_USE_PINPAD;

    if (auth_info->attrs.pin.flags & SC_PKCS15_PIN_FLAG_SO_PIN) {

      data.pin1.prompt = "Please enter SO PIN";

      data.pin2.prompt = "Please enter new SO PIN";

    }

    else {

      data.pin1.prompt = "Please enter PIN";

      data.pin2.prompt = "Please enter new PIN";

    }

  }

  r = sc_pin_cmd(card, &data, &auth_info->tries_left);

  if (r == SC_SUCCESS)

    sc_pkcs15_pincache_add(p15card, pin_obj, newpin, newpinlen);

out:

  sc_unlock(card);

  return r;

}

/*

 * Unblock a PIN.

 */

int sc_pkcs15_unblock_pin(struct sc_pkcs15_card *p15card,

       struct sc_pkcs15_object *pin_obj,

       const u8 *puk, size_t puklen,

       const u8 *newpin, size_t newpinlen)

{

  struct sc_context *ctx = p15card->card->ctx;

  struct sc_pin_cmd_data data;

  struct sc_pkcs15_object *puk_obj;

  struct sc_pkcs15_auth_info *puk_info = NULL;

  int pukref = 0;

  struct sc_pkcs15_auth_info *auth_info = (struct sc_pkcs15_auth_info *)pin_obj->data;

  struct sc_card *card = p15card->card;

  int r;

  LOG_FUNC_CALLED(ctx);

  if (auth_info->auth_type != SC_PKCS15_PIN_AUTH_TYPE_PIN)

    LOG_FUNC_RETURN(ctx, SC_ERROR_NOT_SUPPORTED);

  /* make sure the pins are in valid range */

  r = _validate_pin(p15card, auth_info, newpinlen);

  LOG_TEST_RET(ctx, r, "New PIN value do not conform PIN policy");

  /* get pin_info object of the puk (this is a little bit complicated

   * as we don't have the id of the puk (at least now))

   * note: for compatibility reasons we give no error if no puk object

   * is found */

  /* first step: try to get the pkcs15 object of the puk */

  r = sc_pkcs15_find_pin_by_auth_id(p15card, &pin_obj->auth_id, &puk_obj);

  if (r >= 0 && puk_obj) {

    /* second step:  get the pkcs15 info object of the puk */

    puk_info = (struct sc_pkcs15_auth_info *)puk_obj->data;

    pukref = puk_info->attrs.pin.reference;

  }

  if (!puk_info) {

    sc_log(ctx, "Unable to get puk object, using pin object instead!");

    puk_info = auth_info;

  }

  /* make sure the puk is in valid range */

  r = _validate_pin(p15card, puk_info, puklen);

  LOG_TEST_RET(ctx, r, "PIN do not conforms PIN policy");

  /*

   * With the current card driver interface we have no way of specifying different padding

   * flags for the PIN and the PUK. Therefore reject this case.

   */

  if ((auth_info->attrs.pin.flags & SC_PKCS15_PIN_FLAG_NEEDS_PADDING) !=

      (puk_info->attrs.pin.flags & SC_PKCS15_PIN_FLAG_NEEDS_PADDING)) {

    LOG_TEST_RET(ctx, r, "Padding mismatch for PIN/PUK");

  }

  r = sc_lock(card);

  LOG_TEST_RET(ctx, r, "sc_lock() failed");

  /* the path in the pin object is optional */

  if ((auth_info->path.len > 0) || ((auth_info->path.aid.len > 0))) {

    r = sc_select_file(card, &auth_info->path, NULL);

    if (r)

      goto out;

  }

  /* set pin_cmd data */

  memset(&data, 0, sizeof(data));

  data.cmd             = SC_PIN_CMD_UNBLOCK;

  data.pin_type        = SC_AC_CHV;

  data.pin_reference   = auth_info->attrs.pin.reference;

  data.puk_reference   = pukref;

  data.pin1.data       = puk;

  data.pin1.len        = puklen;

  data.pin1.pad_char   = puk_info->attrs.pin.pad_char;

  data.pin1.min_length = puk_info->attrs.pin.min_length;

  data.pin1.max_length = puk_info->attrs.pin.max_length;

  data.pin1.pad_length = puk_info->attrs.pin.stored_length;

  data.pin2.data       = newpin;

  data.pin2.len        = newpinlen;

  data.pin2.pad_char   = auth_info->attrs.pin.pad_char;

  data.pin2.min_length = auth_info->attrs.pin.min_length;

  data.pin2.max_length = auth_info->attrs.pin.max_length;

  data.pin2.pad_length = auth_info->attrs.pin.stored_length;

  if (auth_info->attrs.pin.flags & SC_PKCS15_PIN_FLAG_NEEDS_PADDING)

    data.flags |= SC_PIN_CMD_NEED_PADDING;

  switch (auth_info->attrs.pin.type) {

  case SC_PKCS15_PIN_TYPE_BCD:

    data.pin1.encoding = SC_PIN_ENCODING_BCD;

    break;

  case SC_PKCS15_PIN_TYPE_ASCII_NUMERIC:

    data.pin1.encoding = SC_PIN_ENCODING_ASCII;

    break;

  }

  switch (puk_info->attrs.pin.type) {

  case SC_PKCS15_PIN_TYPE_BCD:

    data.pin2.encoding = SC_PIN_ENCODING_BCD;

    break;

  case SC_PKCS15_PIN_TYPE_ASCII_NUMERIC:

    data.pin2.encoding = SC_PIN_ENCODING_ASCII;

    break;

  }

  if((p15card->card->reader->capabilities & SC_READER_CAP_PIN_PAD

        || p15card->card->caps & SC_CARD_CAP_PROTECTED_AUTHENTICATION_PATH)) {

    data.flags |= SC_PIN_CMD_USE_PINPAD;

    if (auth_info->attrs.pin.flags & SC_PKCS15_PIN_FLAG_SO_PIN) {

      data.pin1.prompt = "Please enter PUK";

      data.pin2.prompt = "Please enter new SO PIN";

    }

    else {

      data.pin1.prompt = "Please enter PUK";

      data.pin2.prompt = "Please enter new PIN";

    }

  }

  r = sc_pin_cmd(card, &data, &auth_info->tries_left);

  if (r == SC_SUCCESS)

    sc_pkcs15_pincache_add(p15card, pin_obj, newpin, newpinlen);

out:

  sc_unlock(card);

  LOG_FUNC_RETURN(ctx, r);

}

int sc_pkcs15_get_pin_info(struct sc_pkcs15_card *p15card,

       struct sc_pkcs15_object *pin_obj)

{

  int r;

  struct sc_pin_cmd_data data;

  struct sc_card *card = p15card->card;

  struct sc_context *ctx = card->ctx;

  struct sc_pkcs15_auth_info *pin_info = (struct sc_pkcs15_auth_info *) pin_obj->data;

  LOG_FUNC_CALLED(ctx);

  r = sc_lock(card);

  if (r != SC_SUCCESS)

    return r;

  if (pin_info->auth_type != SC_PKCS15_PIN_AUTH_TYPE_PIN)   {

    r = SC_ERROR_INVALID_DATA;

    goto out;

  }

  /* the path in the pin object is optional */

  if ((pin_info->path.len > 0) || ((pin_info->path.aid.len > 0))) {

    r = sc_select_file(card, &pin_info->path, NULL);

    if (r)

      goto out;

  }

  /* Try to update PIN info from card */

  memset(&data, 0, sizeof(data));

  data.cmd = SC_PIN_CMD_GET_INFO;

  data.pin_type = pin_info->auth_method;

  data.pin_reference = pin_info->attrs.pin.reference;

  r = sc_pin_cmd(card, &data, NULL);

  if (r == SC_SUCCESS) {

    if (data.pin1.max_tries > 0)

      pin_info->max_tries = data.pin1.max_tries;

    /* tries_left must be supported or sc_pin_cmd should not return SC_SUCCESS */

    pin_info->tries_left = data.pin1.tries_left;

    pin_info->logged_in = data.pin1.logged_in;

  }

out:

  sc_unlock(card);

  LOG_FUNC_RETURN(ctx, r);

}

void sc_pkcs15_free_auth_info(sc_pkcs15_auth_info_t *auth_info)

{

  free(auth_info);

}

/* Add a PIN to the PIN cache related to the card. Some operations can trigger re-authentication later. */

void sc_pkcs15_pincache_add(struct sc_pkcs15_card *p15card, struct sc_pkcs15_object *pin_obj,

  const u8 *pin, size_t pinlen)

{

  struct sc_context *ctx = p15card->card->ctx;

  struct sc_pkcs15_auth_info *auth_info = (struct sc_pkcs15_auth_info *)pin_obj->data;

  struct sc_pkcs15_object *obj = NULL;

  int r;

  LOG_FUNC_CALLED(ctx);

  if (!pin || !pinlen)   {

    sc_log(ctx, "No cache for zero length PIN");

    return;

  }

  else if (!p15card->opts.use_pin_cache)   {

    sc_log(ctx, "PIN caching not enabled");

    return;

  }

  else if (auth_info->auth_type != SC_PKCS15_PIN_AUTH_TYPE_PIN)   {

    sc_log(ctx, "only 'PIN' auth. object can be cached");

    return;

  }

  /* If the PIN protects an object with user consent, don't cache it */

  obj = p15card->obj_list;

  while (obj != NULL) {

    /* Compare 'sc_pkcs15_object.auth_id' with 'sc_pkcs15_pin_info.auth_id'.

     * In accordance with PKCS#15 "6.1.8 CommonObjectAttributes" and

     * "6.1.16 CommonAuthenticationObjectAttributes" with the exception that

     * "CommonObjectAttributes.accessControlRules" are not taken into account. */

    if (sc_pkcs15_compare_id(&obj->auth_id, &auth_info->auth_id)) {

      /* Caching is refused, if the protected object requires user consent */

      if (!p15card->opts.pin_cache_ignore_user_consent) {

        if (obj->user_consent > 0) {

          sc_log(ctx, "caching refused (user consent)");

          return;

        }

      }

    }

    obj = obj->next;

  }

  r = sc_pkcs15_allocate_object_content(ctx, pin_obj, pin, pinlen);

  if (r != SC_SUCCESS)   {

    sc_log(ctx, "Failed to allocate object content");

    return;

  }

  pin_obj->usage_counter = 0;

  sc_log(ctx, "PIN(%s) cached", pin_obj->label);

}

/* Validate the PIN code associated with an object */

int

sc_pkcs15_pincache_revalidate(struct sc_pkcs15_card *p15card, const sc_pkcs15_object_t *obj)

{

  struct sc_context *ctx = p15card->card->ctx;

  sc_pkcs15_object_t *pin_obj;

  int r;

  LOG_FUNC_CALLED(ctx);

  if (!p15card->opts.use_pin_cache)

    return SC_ERROR_SECURITY_STATUS_NOT_SATISFIED;

  /*  Apps that do not support CK_ALWAYS_AUTHENTICATE

   *  may need pin_cache_ignore_user_consent = 1 */

  if (!p15card->opts.pin_cache_ignore_user_consent) {

      if (obj->user_consent)

    return SC_ERROR_SECURITY_STATUS_NOT_SATISFIED;

  }

  if ((p15card->card->reader->capabilities & SC_READER_CAP_PIN_PAD

        || p15card->card->caps & SC_CARD_CAP_PROTECTED_AUTHENTICATION_PATH))

    return SC_ERROR_SECURITY_STATUS_NOT_SATISFIED;

  r = sc_pkcs15_find_pin_by_auth_id(p15card, &obj->auth_id, &pin_obj);

  if (r != SC_SUCCESS) {

    sc_log(ctx, "Could not find pin object for auth_id %s", sc_pkcs15_print_id(&obj->auth_id));

    return SC_ERROR_SECURITY_STATUS_NOT_SATISFIED;

  }

  if (pin_obj->usage_counter >= p15card->opts.pin_cache_counter) {

    sc_pkcs15_free_object_content(pin_obj);

    return SC_ERROR_SECURITY_STATUS_NOT_SATISFIED;

  }

  if (!pin_obj->content.value || !pin_obj->content.len)

    return SC_ERROR_SECURITY_STATUS_NOT_SATISFIED;

  pin_obj->usage_counter++;

  r = _sc_pkcs15_verify_pin(p15card, pin_obj, pin_obj->content.value, pin_obj->content.len);

  if (r != SC_SUCCESS) {

    /* Ensure that wrong PIN isn't used again */

    sc_pkcs15_free_object_content(pin_obj);

    sc_log(ctx, "Verify PIN error %i", r);

    return SC_ERROR_SECURITY_STATUS_NOT_SATISFIED;

  }

  LOG_FUNC_RETURN(ctx, SC_SUCCESS);

}

void sc_pkcs15_pincache_clear(struct sc_pkcs15_card *p15card)

{

  struct sc_pkcs15_object *objs[32];

  int i, r;

  LOG_FUNC_CALLED(p15card->card->ctx);

  r = sc_pkcs15_get_objects(p15card, SC_PKCS15_TYPE_AUTH_PIN, objs, 32);

  for (i = 0; i < r; i++)

    sc_pkcs15_free_object_content(objs[i]);

}