/*

 * pkcs15-cert.c: PKCS #15 certificate 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 <stdlib.h>

#include <string.h>

#include <stdio.h>

#include <sys/stat.h>

#ifdef HAVE_UNISTD_H

#include <unistd.h>

#endif

#include <assert.h>

#include "internal.h"

#include "asn1.h"

#include "pkcs15.h"

static int

parse_x509_cert(sc_context_t *ctx, struct sc_pkcs15_der *der, struct sc_pkcs15_cert *cert)

{

  int r;

  struct sc_algorithm_id sig_alg = {0};

  struct sc_pkcs15_pubkey *pubkey = NULL;

  unsigned char *serial = NULL, *issuer = NULL, *subject = NULL, *buf =  der->value;

  size_t serial_len = 0, issuer_len = 0, subject_len = 0, data_len = 0, buflen = der->len;

  struct sc_asn1_entry asn1_version[] = {

    { "version", SC_ASN1_INTEGER, SC_ASN1_TAG_INTEGER, 0, &cert->version, NULL },

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

  };

  struct sc_asn1_entry asn1_extensions[] = {

    { "x509v3",   SC_ASN1_OCTET_STRING,    SC_ASN1_TAG_SEQUENCE | SC_ASN1_CONS, SC_ASN1_OPTIONAL| SC_ASN1_ALLOC, &cert->extensions, &cert->extensions_len },

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

  };

  struct sc_asn1_entry asn1_tbscert[] = {

    { "version",    SC_ASN1_STRUCT,    SC_ASN1_CTX | 0 | SC_ASN1_CONS, SC_ASN1_OPTIONAL, asn1_version, NULL },

    { "serialNumber", SC_ASN1_OCTET_STRING, SC_ASN1_TAG_INTEGER, SC_ASN1_ALLOC, &serial, &serial_len },

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

    { "issuer",   SC_ASN1_OCTET_STRING, SC_ASN1_TAG_SEQUENCE | SC_ASN1_CONS, SC_ASN1_ALLOC, &issuer, &issuer_len },

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

    { "subject",    SC_ASN1_OCTET_STRING, SC_ASN1_TAG_SEQUENCE | SC_ASN1_CONS, SC_ASN1_ALLOC, &subject, &subject_len },

    /* Use a callback to get the algorithm, parameters and pubkey into sc_pkcs15_pubkey */

    { "subjectPublicKeyInfo",SC_ASN1_CALLBACK, SC_ASN1_TAG_SEQUENCE | SC_ASN1_CONS, 0, sc_pkcs15_pubkey_from_spki_fields,  &pubkey },

    { "extensions",   SC_ASN1_STRUCT,    SC_ASN1_CTX | 3 | SC_ASN1_CONS, SC_ASN1_OPTIONAL, asn1_extensions, NULL },

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

  };

  struct sc_asn1_entry asn1_cert[] = {

    { "tbsCertificate", SC_ASN1_STRUCT,    SC_ASN1_TAG_SEQUENCE | SC_ASN1_CONS, 0, asn1_tbscert, NULL },

    { "signatureAlgorithm", SC_ASN1_ALGORITHM_ID, SC_ASN1_TAG_SEQUENCE | SC_ASN1_CONS, 0, &sig_alg, NULL },

    { "signatureValue", SC_ASN1_BIT_STRING, SC_ASN1_TAG_BIT_STRING, 0, NULL, NULL },

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

  };

  struct sc_asn1_entry asn1_serial_number[] = {

    { "serialNumber", SC_ASN1_OCTET_STRING, SC_ASN1_TAG_INTEGER, SC_ASN1_ALLOC, NULL, NULL },

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

  };

  struct sc_asn1_entry asn1_subject[] = {

    { "subject", SC_ASN1_OCTET_STRING, SC_ASN1_TAG_SEQUENCE | SC_ASN1_CONS, SC_ASN1_ALLOC, NULL, NULL },

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

  };

  struct sc_asn1_entry asn1_issuer[] = {

    { "issuer", SC_ASN1_OCTET_STRING, SC_ASN1_TAG_SEQUENCE | SC_ASN1_CONS, SC_ASN1_ALLOC, NULL, NULL },

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

  };

  const u8 *obj;

  size_t objlen;

  LOG_FUNC_CALLED(ctx);

  memset(cert, 0, sizeof(*cert));

  obj = sc_asn1_verify_tag(ctx, buf, buflen, SC_ASN1_TAG_SEQUENCE | SC_ASN1_CONS, &objlen);

  if (obj == NULL)

    LOG_TEST_RET(ctx, SC_ERROR_INVALID_ASN1_OBJECT, "X.509 certificate not found");

  data_len = objlen + (obj - buf);

  cert->data.value = malloc(data_len);

  if (!cert->data.value)

    LOG_FUNC_RETURN(ctx, SC_ERROR_OUT_OF_MEMORY);

  memcpy(cert->data.value, buf, data_len);

  cert->data.len = data_len;

  r = sc_asn1_decode(ctx, asn1_cert, obj, objlen, NULL, NULL);

  cert->key = pubkey;

  cert->version++;

  LOG_TEST_GOTO_ERR(ctx, r, "ASN.1 parsing of certificate failed");

  if (!pubkey)

    LOG_TEST_GOTO_ERR(ctx, SC_ERROR_INVALID_ASN1_OBJECT, "Unable to decode subjectPublicKeyInfo from cert");

  if (serial && serial_len)   {

    sc_format_asn1_entry(asn1_serial_number + 0, serial, &serial_len, 1);

    r = sc_asn1_encode(ctx, asn1_serial_number, &cert->serial, &cert->serial_len);

    LOG_TEST_GOTO_ERR(ctx, r, "ASN.1 encoding of serial failed");

  }

  if (subject && subject_len)   {

    sc_format_asn1_entry(asn1_subject + 0, subject, &subject_len, 1);

    r = sc_asn1_encode(ctx, asn1_subject, &cert->subject, &cert->subject_len);

    LOG_TEST_GOTO_ERR(ctx, r, "ASN.1 encoding of subject");

  }

  if (issuer && issuer_len)   {

    sc_format_asn1_entry(asn1_issuer + 0, issuer, &issuer_len, 1);

    r = sc_asn1_encode(ctx, asn1_issuer, &cert->issuer, &cert->issuer_len);

    LOG_TEST_GOTO_ERR(ctx, r, "ASN.1 encoding of issuer");

  }

err:

  /* not used for anything */

  sc_asn1_clear_algorithm_id(&sig_alg);

  free(serial);

  free(subject);

  free(issuer);

  LOG_FUNC_RETURN(ctx, r);

}

/* Get a component of Distinguished Name (e.i. subject or issuer) USING the oid tag.

 * dn can be either cert->subject or cert->issuer.

 * dn_len would be cert->subject_len or cert->issuer_len.

 *

 * Common types:

 *   CN:      struct sc_object_id type = {{2, 5, 4, 3, -1}};

 *   Country: struct sc_object_id type = {{2, 5, 4, 6, -1}};

 *   L:       struct sc_object_id type = {{2, 5, 4, 7, -1}};

 *   S:       struct sc_object_id type = {{2, 5, 4, 8, -1}};

 *   O:       struct sc_object_id type = {{2, 5, 4, 10, -1}};

 *   OU:      struct sc_object_id type = {{2, 5, 4, 11, -1}};

 *

 * if *name is NULL, sc_pkcs15_get_name_from_dn will allocate space for name.

 */

int

sc_pkcs15_get_name_from_dn(struct sc_context *ctx, const u8 *dn, size_t dn_len,

  const struct sc_object_id *type, u8 **name, size_t *name_len)

{

  const u8 *rdn = NULL;

  const u8 *next_ava = NULL;

  size_t rdn_len = 0;

  size_t next_ava_len = 0;

  int rv;

  rdn = sc_asn1_skip_tag(ctx, &dn, &dn_len, SC_ASN1_TAG_SEQUENCE | SC_ASN1_CONS, &rdn_len);

  if (rdn == NULL)

    LOG_TEST_RET(ctx, SC_ERROR_INVALID_ASN1_OBJECT, "ASN.1 decoding of Distinguished Name");

  for (next_ava = rdn, next_ava_len = rdn_len; next_ava_len; ) {

    const u8 *ava, *dummy, *oidp;

    struct sc_object_id oid;

    size_t ava_len = 0, dummy_len, oid_len = 0;

    /* unwrap the set and point to the next ava */

    ava = sc_asn1_skip_tag(ctx, &next_ava, &next_ava_len, SC_ASN1_TAG_SET | SC_ASN1_CONS, &ava_len);

    if (ava == NULL)

      LOG_TEST_RET(ctx, SC_ERROR_INVALID_ASN1_OBJECT, "ASN.1 decoding of AVA");

    /* It would be nice to use sc_asn1_decode here to parse the entire AVA, but we are missing 1 critical

     *  function in the templates: the ability to accept any tag for value. This prevents us from just

     *  grabbing the value as is out of the template. AVA's can have tags of PRINTABLE_STRING,

     *  TELETEXSTRING, T61STRING or UTF8_STRING with PRINTABLE_STRING and UTF8_STRING being the most common.

     * The other feature that would be nice is returning a pointer to our requested data using the space

     *  of the parent (basically what this code is doing here), rather than allocating and copying.

     */

    /* unwrap the sequence */

    dummy = ava; dummy_len = ava_len;

    ava = sc_asn1_skip_tag(ctx, &dummy, &dummy_len, SC_ASN1_TAG_SEQUENCE | SC_ASN1_CONS, &ava_len);

    if (ava == NULL)

      LOG_TEST_RET(ctx, SC_ERROR_INVALID_ASN1_OBJECT, "ASN.1 decoding of AVA");

    /* unwrap the oid */

    oidp = sc_asn1_skip_tag(ctx, &ava, &ava_len, SC_ASN1_TAG_OBJECT, &oid_len);

    if (ava == NULL)

      LOG_TEST_RET(ctx, SC_ERROR_INVALID_ASN1_OBJECT, "ASN.1 decoding of AVA OID");

    /* Convert to OID */

    rv = sc_asn1_decode_object_id(oidp, oid_len, &oid);

    if (rv != SC_SUCCESS)

      LOG_TEST_RET(ctx, SC_ERROR_INVALID_ASN1_OBJECT, "ASN.1 decoding of AVA OID");

    if (sc_compare_oid(&oid, type) == 0)

      continue;

    /* Yes, then return the name */

    dummy = sc_asn1_skip_tag(ctx, &ava, &ava_len, ava[0] & SC_ASN1_TAG_PRIMITIVE, &dummy_len);

    if (dummy == NULL)

      LOG_TEST_RET(ctx, SC_ERROR_INVALID_ASN1_OBJECT, "ASN.1 decoding of AVA name");

    if (*name == NULL) {

      *name = malloc(dummy_len);

      if (*name == NULL)

        LOG_FUNC_RETURN(ctx, SC_ERROR_OUT_OF_MEMORY);

      *name_len = dummy_len;

    }

    *name_len = MIN(dummy_len, *name_len);

    memcpy(*name, dummy, *name_len);

    LOG_FUNC_RETURN(ctx, SC_SUCCESS);

  }

  LOG_FUNC_RETURN(ctx, SC_ERROR_ASN1_OBJECT_NOT_FOUND);

}

/* Get a specific extension from the cert.

 * The extension is identified by it's oid value.

 * NOTE: extensions can occur in any number or any order, which is why we

 *  can't parse them with a single pass of the asn1 decoder.

 * If is_critical is supplied, then it is set to 1 if the extension is critical

 * and 0 if it is not.

 * The data in the extension is extension specific.

 * The following are common extension values:

 *   Subject Key ID:    struct sc_object_id type = {{2, 5, 29, 14, -1}};

 *   Key Usage:     struct sc_object_id type = {{2, 5, 29, 15, -1}};

 *   Subject Alt Name:    struct sc_object_id type = {{2, 5, 29, 17, -1}};

 *   Basic Constraints:   struct sc_object_id type = {{2, 5, 29, 19, -1}};

 *   CRL Distribution Points: struct sc_object_id type = {{2, 5, 29, 31, -1}};

 *   Certificate Policies:  struct sc_object_id type = {{2, 5, 29, 32, -1}};

 *   Extended Key Usage:  struct sc_object_id type = {{2, 5, 29, 37, -1}};

 *

 * if *ext_val is NULL, sc_pkcs15_get_extension will allocate space for ext_val.

 */

int

sc_pkcs15_get_extension(struct sc_context *ctx, struct sc_pkcs15_cert *cert,

  const struct sc_object_id *type, u8 **ext_val,

  size_t *ext_val_len, int *is_critical)

{

  const u8 *ext = NULL;

  const u8 *next_ext = NULL;

  size_t ext_len = 0;

  size_t next_ext_len = 0;

  struct sc_object_id oid;

  u8 *val = NULL;

  size_t val_len = 0;

  int critical;

  int r;

  struct sc_asn1_entry asn1_cert_ext[] = {

    { "x509v3 entry OID", SC_ASN1_OBJECT, SC_ASN1_TAG_OBJECT, 0, &oid, 0 },

    { "criticalFlag",  SC_ASN1_BOOLEAN, SC_ASN1_TAG_BOOLEAN, SC_ASN1_OPTIONAL, &critical, NULL },

    { "extensionValue",SC_ASN1_OCTET_STRING, SC_ASN1_TAG_OCTET_STRING, SC_ASN1_ALLOC, &val, &val_len },

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

  };

  LOG_FUNC_CALLED(ctx);

  for (next_ext = cert->extensions, next_ext_len = cert->extensions_len; next_ext_len; ) {

    /* unwrap the set and point to the next ava */

    ext = sc_asn1_skip_tag(ctx, &next_ext, &next_ext_len,

      SC_ASN1_TAG_SEQUENCE | SC_ASN1_CONS, &ext_len);

    if (ext == NULL)

      LOG_TEST_RET(ctx, SC_ERROR_INVALID_ASN1_OBJECT, "ASN.1 decoding of AVA");

    /*

     * use the sc_asn1_decoder for clarity. NOTE it would be more efficient to do this by hand

     * so we avoid the many malloc/frees here, but one hopes that one day the asn1_decode will allow

     * a 'static pointer' flag that returns a const pointer to the actual asn1 space so we only need

     * to make a final copy of the extension value before we return */

    critical = 0;

    r = sc_asn1_decode(ctx, asn1_cert_ext, ext, ext_len, NULL, NULL);

    if (r < 0)

      LOG_FUNC_RETURN(ctx, r);

    /* is it the RN we are looking for */

    if (sc_compare_oid(&oid, type) != 0) {

      if (*ext_val == NULL) {

        *ext_val = val;

        val = NULL;

        *ext_val_len = val_len;

        /* do not free here -- return the allocated value to caller */

      }

      else {

        *ext_val_len = MIN(*ext_val_len, val_len);

        if (val) {

          memcpy(*ext_val, val, *ext_val_len);

          free(val);

        }

      }

      if (is_critical)

        *is_critical = critical;

      r = (int)val_len;

      LOG_FUNC_RETURN(ctx, r);

    }

    if (val) {

      free(val);

      val = NULL;

    }

  }

  if (val)

      free(val);

  LOG_FUNC_RETURN(ctx, SC_ERROR_ASN1_OBJECT_NOT_FOUND);

}

/*

 *  Get an extension whose value is a bit string. These include keyUsage and extendedKeyUsage.

 *  See above for the other parameters.

 */

int

sc_pkcs15_get_bitstring_extension(struct sc_context *ctx,

  struct sc_pkcs15_cert *cert, const struct sc_object_id *type,

  unsigned int *value, int *is_critical)

{

  int r;

  u8 *bit_string = NULL;

  size_t bit_string_len=0, val_len = sizeof(*value);

  struct sc_asn1_entry asn1_bit_string[] = {

    { "bitString", SC_ASN1_BIT_FIELD, SC_ASN1_TAG_BIT_STRING, 0, value, &val_len },

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

  };

  LOG_FUNC_CALLED(ctx);

  r = sc_pkcs15_get_extension(ctx, cert, type, &bit_string, &bit_string_len, is_critical);

  LOG_TEST_RET(ctx, r, "Get extension error");

  r = sc_asn1_decode(ctx, asn1_bit_string, bit_string, bit_string_len, NULL, NULL);

  free(bit_string);

  LOG_TEST_RET(ctx, r, "Decoding extension bit string");

  LOG_FUNC_RETURN(ctx, SC_SUCCESS);

}

int

sc_pkcs15_pubkey_from_cert(struct sc_context *ctx,

    struct sc_pkcs15_der *cert_blob, struct sc_pkcs15_pubkey **out)

{

  int rv;

  struct sc_pkcs15_cert * cert;

  cert =  calloc(1, sizeof(struct sc_pkcs15_cert));

  if (cert == NULL)

    return SC_ERROR_OUT_OF_MEMORY;

  rv = parse_x509_cert(ctx, cert_blob, cert);

  *out = cert->key;

  cert->key = NULL;

  sc_pkcs15_free_certificate(cert);

  LOG_FUNC_RETURN(ctx, rv);

}

int

sc_pkcs15_read_certificate(struct sc_pkcs15_card *p15card, const struct sc_pkcs15_cert_info *info,

    int private_obj, struct sc_pkcs15_cert **cert_out)

{

  struct sc_context *ctx = NULL;

  struct sc_pkcs15_cert *cert = NULL;

  struct sc_pkcs15_der der;

  int r;

  if (p15card == NULL || info == NULL || cert_out == NULL) {

    return SC_ERROR_INVALID_ARGUMENTS;

  }

  ctx = p15card->card->ctx;

  LOG_FUNC_CALLED(ctx);

  if (info->value.len && info->value.value)   {

    sc_der_copy(&der, &info->value);

  }

  else if (info->path.len) {

    r = sc_pkcs15_read_file(p15card, &info->path, &der.value, &der.len, private_obj);

    LOG_TEST_RET(ctx, r, "Unable to read certificate file.");

  }

  else   {

    LOG_FUNC_RETURN(ctx, SC_ERROR_OBJECT_NOT_FOUND);

  }

  cert = malloc(sizeof(struct sc_pkcs15_cert));

  if (cert == NULL) {

    free(der.value);

    LOG_FUNC_RETURN(ctx, SC_ERROR_OUT_OF_MEMORY);

  }

  memset(cert, 0, sizeof(struct sc_pkcs15_cert));

  if (parse_x509_cert(ctx, &der, cert)) {

    free(der.value);

    sc_pkcs15_free_certificate(cert);

    LOG_FUNC_RETURN(ctx, SC_ERROR_INVALID_ASN1_OBJECT);

  }

  free(der.value);

  *cert_out = cert;

  LOG_FUNC_RETURN(ctx, SC_SUCCESS);

}

static const struct sc_asn1_entry c_asn1_cred_ident[] = {

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

  { "idValue",  SC_ASN1_OCTET_STRING, SC_ASN1_TAG_OCTET_STRING, 0, NULL, NULL },

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

};

static const struct sc_asn1_entry c_asn1_com_cert_attr[] = {

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

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

  { "identifier", SC_ASN1_STRUCT,    SC_ASN1_TAG_SEQUENCE | SC_ASN1_CONS, SC_ASN1_OPTIONAL, NULL, NULL },

  /* FIXME: Add rest of the optional fields */

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

};

static const struct sc_asn1_entry c_asn1_x509_cert_value_choice[] = {

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

  { "direct", SC_ASN1_OCTET_STRING, SC_ASN1_CTX | 0 | SC_ASN1_CONS, SC_ASN1_OPTIONAL | SC_ASN1_ALLOC, NULL, NULL },

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

};

static const struct sc_asn1_entry c_asn1_x509_cert_attr[] = {

  { "value",  SC_ASN1_CHOICE, 0, 0, NULL, NULL },

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

};

static const struct sc_asn1_entry c_asn1_type_cert_attr[] = {

  { "x509CertificateAttributes", 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_cert[] = {

  { "x509Certificate", SC_ASN1_PKCS15_OBJECT, SC_ASN1_TAG_SEQUENCE | SC_ASN1_CONS, 0, NULL, NULL },

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

};

int

sc_pkcs15_decode_cdf_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_cert_info info;

  struct sc_asn1_entry  asn1_cred_ident[3], asn1_com_cert_attr[4],

        asn1_x509_cert_attr[2], asn1_type_cert_attr[2],

        asn1_cert[2], asn1_x509_cert_value_choice[3];

  struct sc_asn1_pkcs15_object cert_obj = {

    obj, asn1_com_cert_attr, NULL,

    asn1_type_cert_attr };

  sc_pkcs15_der_t *der = &info.value;

  u8 id_value[128];

  int id_type;

  size_t id_value_len = sizeof(id_value);

  int r;

  sc_copy_asn1_entry(c_asn1_cred_ident, asn1_cred_ident);

  sc_copy_asn1_entry(c_asn1_com_cert_attr, asn1_com_cert_attr);

  sc_copy_asn1_entry(c_asn1_x509_cert_attr, asn1_x509_cert_attr);

  sc_copy_asn1_entry(c_asn1_x509_cert_value_choice, asn1_x509_cert_value_choice);

  sc_copy_asn1_entry(c_asn1_type_cert_attr, asn1_type_cert_attr);

  sc_copy_asn1_entry(c_asn1_cert, asn1_cert);

  sc_format_asn1_entry(asn1_cred_ident + 0, &id_type, NULL, 0);

  sc_format_asn1_entry(asn1_cred_ident + 1, &id_value, &id_value_len, 0);

  sc_format_asn1_entry(asn1_com_cert_attr + 0, &info.id, NULL, 0);

  sc_format_asn1_entry(asn1_com_cert_attr + 1, &info.authority, NULL, 0);

  sc_format_asn1_entry(asn1_com_cert_attr + 2, asn1_cred_ident, NULL, 0);

  sc_format_asn1_entry(asn1_x509_cert_attr + 0, asn1_x509_cert_value_choice, NULL, 0);

  sc_format_asn1_entry(asn1_x509_cert_value_choice + 0, &info.path, NULL, 0);

  sc_format_asn1_entry(asn1_x509_cert_value_choice + 1, &der->value, &der->len, 0);

  sc_format_asn1_entry(asn1_type_cert_attr + 0, asn1_x509_cert_attr, NULL, 0);

  sc_format_asn1_entry(asn1_cert + 0, &cert_obj, NULL, 0);

  /* Fill in defaults */

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

  info.authority = 0;

  r = sc_asn1_decode(ctx, asn1_cert, *buf, *buflen, buf, buflen);

  /* In case of error, trash the cert value (direct coding) */

  if (r < 0 && der->value)

    free(der->value);

  if (r == SC_ERROR_ASN1_END_OF_CONTENTS)

    return r;

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

  if (!p15card->app || !p15card->app->ddo.aid.len) {

    if (!p15card->file_app) {

      free(der->value);

      return SC_ERROR_INTERNAL;

    }

    r = sc_pkcs15_make_absolute_path(&p15card->file_app->path, &info.path);

    LOG_TEST_RET(ctx, r, "Cannot make absolute path");

  }

  else   {

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

  }

  sc_log(ctx, "Certificate path '%s'", sc_print_path(&info.path));

  switch (p15card->opts.pin_protected_certificate) {

    case SC_PKCS15_CARD_OPTS_PRIV_CERT_DECLASSIFY:

      sc_log(ctx, "Declassifying certificate");

      obj->flags &= ~SC_PKCS15_CO_FLAG_PRIVATE;

      break;

    case SC_PKCS15_CARD_OPTS_PRIV_CERT_IGNORE:

      sc_log(ctx, "Ignoring certificate");

      free(der->value);

      return 0;

  }

  obj->type = SC_PKCS15_TYPE_CERT_X509;

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

  if (obj->data == NULL)

    LOG_FUNC_RETURN(ctx, SC_ERROR_OUT_OF_MEMORY);

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

  return 0;

}

int

sc_pkcs15_encode_cdf_entry(sc_context_t *ctx, const struct sc_pkcs15_object *obj,

    u8 **buf, size_t *bufsize)

{

  struct sc_asn1_entry  asn1_cred_ident[3], asn1_com_cert_attr[4],

        asn1_x509_cert_attr[2], asn1_type_cert_attr[2],

        asn1_cert[2], asn1_x509_cert_value_choice[3];

  struct sc_pkcs15_cert_info *infop = (sc_pkcs15_cert_info_t *) obj->data;

  sc_pkcs15_der_t *der = &infop->value;

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

              asn1_com_cert_attr, NULL,

              asn1_type_cert_attr };

  int r;

  sc_copy_asn1_entry(c_asn1_cred_ident, asn1_cred_ident);

  sc_copy_asn1_entry(c_asn1_com_cert_attr, asn1_com_cert_attr);

  sc_copy_asn1_entry(c_asn1_x509_cert_attr, asn1_x509_cert_attr);

  sc_copy_asn1_entry(c_asn1_x509_cert_value_choice, asn1_x509_cert_value_choice);

  sc_copy_asn1_entry(c_asn1_type_cert_attr, asn1_type_cert_attr);

  sc_copy_asn1_entry(c_asn1_cert, asn1_cert);

  sc_format_asn1_entry(asn1_com_cert_attr + 0, (void *) &infop->id, NULL, 1);

  if (infop->authority)

    sc_format_asn1_entry(asn1_com_cert_attr + 1, (void *) &infop->authority, NULL, 1);

  if (infop->path.len || !der->value) {

    sc_format_asn1_entry(asn1_x509_cert_value_choice + 0, &infop->path, NULL, 1);

  } else {

    sc_format_asn1_entry(asn1_x509_cert_value_choice + 1, der->value, &der->len, 1);

  }

  sc_format_asn1_entry(asn1_type_cert_attr + 0, &asn1_x509_cert_value_choice, NULL, 1);

  sc_format_asn1_entry(asn1_cert + 0, (void *) &cert_obj, NULL, 1);

  r = sc_asn1_encode(ctx, asn1_cert, buf, bufsize);

  return r;

}

/* Only certain usages are valid for a given algorithm, return all the usages

 * that the algorithm supports so we can use it as a filter for all

 * the public and private key usages

 */

static unsigned int

sc_pkcs15_alg_flags_from_algorithm(unsigned long algorithm)

{

  switch (algorithm) {

  case SC_ALGORITHM_RSA:

    return SC_PKCS15_PRKEY_USAGE_ENCRYPT | SC_PKCS15_PRKEY_USAGE_WRAP |

           SC_PKCS15_PRKEY_USAGE_VERIFY | SC_PKCS15_PRKEY_USAGE_VERIFYRECOVER |

           SC_PKCS15_PRKEY_USAGE_DECRYPT | SC_PKCS15_PRKEY_USAGE_UNWRAP |

           SC_PKCS15_PRKEY_USAGE_SIGN | SC_PKCS15_PRKEY_USAGE_SIGNRECOVER |

           SC_PKCS15_PRKEY_USAGE_NONREPUDIATION;

#ifdef SC_ALGORITHM_DH

  case SC_ALGORITHM_DH:

    return SC_PKCS15_PRKEY_USAGE_DERIVE ;

#endif

  case SC_ALGORITHM_EC:

    return SC_PKCS15_PRKEY_USAGE_DERIVE | SC_PKCS15_PRKEY_USAGE_VERIFY|

           SC_PKCS15_PRKEY_USAGE_SIGN | SC_PKCS15_PRKEY_USAGE_NONREPUDIATION;

  case SC_ALGORITHM_GOSTR3410:

    return SC_PKCS15_PRKEY_USAGE_DERIVE | SC_PKCS15_PRKEY_USAGE_VERIFY|

           SC_PKCS15_PRKEY_USAGE_SIGN | SC_PKCS15_PRKEY_USAGE_NONREPUDIATION;

  }

  return 0;

}

/* These are the cert key usage bits that map to various PKCS #11 (and thus PKCS #15) flags */

#define SC_PKCS15_X509_USAGE_SIGNATURE \

  (SC_X509_DIGITAL_SIGNATURE | \

  SC_X509_NON_REPUDIATION    | \

  SC_X509_KEY_CERT_SIGN      | \

  SC_X509_CRL_SIGN)

#define SC_PKCS15_X509_USAGE_DERIVE \

  SC_X509_KEY_AGREEMENT

#define SC_PKCS15_X509_USAGE_UNWRAP \

  (SC_X509_KEY_ENCIPHERMENT | \

  SC_X509_KEY_AGREEMENT)

#define SC_PKCS15_X509_USAGE_DECRYPT \

  (SC_X509_DATA_ENCIPHERMENT | \

  SC_X509_ENCIPHER_ONLY)

#define SC_PKCS15_X509_USAGE_NONREPUDIATION \

  SC_X509_NON_REPUDIATION

/* map a cert usage and algorithm to public and private key usages */

int

sc_pkcs15_map_usage(unsigned int cert_usage, unsigned long algorithm,

  unsigned int *pub_usage_ptr, unsigned int *pr_usage_ptr,

  int allow_nonrepudiation)

{

  unsigned int pub_usage = 0, pr_usage = 0;

  unsigned int alg_flags = sc_pkcs15_alg_flags_from_algorithm(algorithm);

  if (cert_usage & SC_PKCS15_X509_USAGE_SIGNATURE) {

    pub_usage |= SC_PKCS15_PRKEY_USAGE_VERIFY|SC_PKCS15_PRKEY_USAGE_VERIFYRECOVER;

    pr_usage |= SC_PKCS15_PRKEY_USAGE_SIGN|SC_PKCS15_PRKEY_USAGE_SIGNRECOVER;

  }

  if (cert_usage & SC_PKCS15_X509_USAGE_DERIVE) {

    pub_usage |= SC_PKCS15_PRKEY_USAGE_DERIVE;

    pr_usage |= SC_PKCS15_PRKEY_USAGE_DERIVE;

  }

  if (cert_usage & (SC_PKCS15_X509_USAGE_DECRYPT|SC_PKCS15_X509_USAGE_UNWRAP)) {

    pub_usage |= SC_PKCS15_PRKEY_USAGE_ENCRYPT;

    pr_usage |= SC_PKCS15_PRKEY_USAGE_DECRYPT;

  }

  if (allow_nonrepudiation && (cert_usage & SC_PKCS15_X509_USAGE_NONREPUDIATION)) {

    pub_usage |= SC_PKCS15_PRKEY_USAGE_NONREPUDIATION;

    pr_usage |= SC_PKCS15_PRKEY_USAGE_NONREPUDIATION;

  }

  /* filter usages algorithm */

  if (pub_usage_ptr) {

    *pub_usage_ptr = pub_usage & alg_flags;

  }

  if (pr_usage_ptr) {

    *pr_usage_ptr = pr_usage & alg_flags;

  }

  return SC_SUCCESS;

}

void

sc_pkcs15_free_certificate(struct sc_pkcs15_cert *cert)

{

  if (cert == NULL) {

    return;

  }

  sc_pkcs15_free_pubkey(cert->key);

  free(cert->subject);

  free(cert->issuer);

  free(cert->serial);

  free(cert->data.value);

  free(cert->extensions);

  free(cert);

}

void

sc_pkcs15_free_cert_info(sc_pkcs15_cert_info_t *cert)

{

  if (!cert)

    return;

  free(cert->value.value);

  free(cert);

}