/src/gnutls/lib/x509/verify-high.c

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/*
 * Copyright (C) 2011-2016 Free Software Foundation, Inc.
 * Copyright (C) 2015-2016 Red Hat, Inc.
 *
 * Author: Nikos Mavrogiannopoulos
 *
 * This file is part of GnuTLS.
 *
 * The GnuTLS 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 program.  If not, see <https://www.gnu.org/licenses/>
 *
 */

#include "gnutls_int.h"
#include "errors.h"
#include <libtasn1.h>
#include <global.h>
#include <num.h>    /* MAX */
#include <tls-sig.h>
#include <str.h>
#include <datum.h>
#include <hash-pjw-bare.h>
#include "x509_int.h"
#include <common.h>
#include <gnutls/x509-ext.h>
#include "verify-high.h"
#include "intprops.h"
#include "gl_linkedhash_list.h"
#include "gl_list.h"

struct named_cert_st {
  gnutls_x509_crt_t cert;
  uint8_t name[MAX_SERVER_NAME_SIZE];
  unsigned int name_size;
};

struct node_st {
  /* The trusted certificates */
  gnutls_x509_crt_t *trusted_cas;
  unsigned int trusted_ca_size;

  struct named_cert_st *named_certs;
  unsigned int named_cert_size;

  /* The trusted CRLs */
  gnutls_x509_crl_t *crls;
  unsigned int crl_size;
};

struct gnutls_x509_trust_list_iter {
  unsigned int node_index;
  unsigned int ca_index;

#ifdef ENABLE_PKCS11
  gnutls_pkcs11_obj_t *pkcs11_list;
  unsigned int pkcs11_index;
  unsigned int pkcs11_size;
#endif
};

#define DEFAULT_SIZE 127

static bool cert_eq(const void *cert1, const void *cert2)
{
  const gnutls_x509_crt_t c1 = (const gnutls_x509_crt_t)cert1;
  const gnutls_x509_crt_t c2 = (const gnutls_x509_crt_t)cert2;
  return gnutls_x509_crt_equals(c1, c2);
}

static size_t cert_hashcode(const void *cert)
{
  const gnutls_x509_crt_t c = (const gnutls_x509_crt_t)cert;
  return hash_pjw_bare(c->raw_dn.data,
           c->raw_dn.size) % DEFAULT_MAX_VERIFY_DEPTH;
}

/**
 * gnutls_x509_trust_list_init:
 * @list: A pointer to the type to be initialized
 * @size: The size of the internal hash table. Use (0) for default size.
 *
 * This function will initialize an X.509 trust list structure.
 *
 * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise a
 *   negative error value.
 *
 * Since: 3.0.0
 **/
int
gnutls_x509_trust_list_init(gnutls_x509_trust_list_t * list, unsigned int size)
{
  gnutls_x509_trust_list_t tmp;

  *list = NULL;
  FAIL_IF_LIB_ERROR;

  tmp = gnutls_calloc(1, sizeof(struct gnutls_x509_trust_list_st));

  if (!tmp)
    return GNUTLS_E_MEMORY_ERROR;

  if (size == 0)
    size = DEFAULT_SIZE;
  tmp->size = size;

  tmp->node = gnutls_calloc(1, tmp->size * sizeof(tmp->node[0]));
  if (tmp->node == NULL) {
    gnutls_assert();
    gnutls_free(tmp);
    return GNUTLS_E_MEMORY_ERROR;
  }

  *list = tmp;

  return 0;   /* success */
}

/**
 * gnutls_x509_trust_list_deinit:
 * @list: The list to be deinitialized
 * @all: if non-zero it will deinitialize all the certificates and CRLs contained in the structure.
 *
 * This function will deinitialize a trust list. Note that the
 * @all flag should be typically non-zero unless you have specified
 * your certificates using gnutls_x509_trust_list_add_cas() and you
 * want to prevent them from being deinitialized by this function.
 *
 * Since: 3.0.0
 **/
void
gnutls_x509_trust_list_deinit(gnutls_x509_trust_list_t list, unsigned int all)
{
  unsigned int i, j;

  if (!list)
    return;

  for (j = 0; j < list->distrusted_size; j++) {
    gnutls_x509_crt_deinit(list->distrusted[j]);
  }
  gnutls_free(list->distrusted);

  for (j = 0; j < list->keep_certs_size; j++) {
    gnutls_x509_crt_deinit(list->keep_certs[j]);
  }
  gnutls_free(list->keep_certs);

  for (i = 0; i < list->size; i++) {
    if (all) {
      for (j = 0; j < list->node[i].trusted_ca_size; j++) {
        gnutls_x509_crt_deinit(list->node[i].
                   trusted_cas[j]);
      }
    }
    gnutls_free(list->node[i].trusted_cas);

    if (all) {
      for (j = 0; j < list->node[i].crl_size; j++) {
        gnutls_x509_crl_deinit(list->node[i].crls[j]);
      }
    }
    gnutls_free(list->node[i].crls);

    if (all) {
      for (j = 0; j < list->node[i].named_cert_size; j++) {
        gnutls_x509_crt_deinit(list->node[i].named_certs
                   [j].cert);
      }
    }
    gnutls_free(list->node[i].named_certs);
  }

  gnutls_free(list->x509_rdn_sequence.data);
  gnutls_free(list->node);
  gnutls_free(list->pkcs11_token);
  gnutls_free(list);
}

static int
add_new_ca_to_rdn_seq(gnutls_x509_trust_list_t list, gnutls_x509_crt_t ca)
{
  gnutls_datum_t tmp;
  size_t newsize;
  unsigned char *newdata, *p;

  /* Add DN of the last added CAs to the RDN sequence
   * This will be sent to clients when a certificate
   * request message is sent.
   */
  tmp.data = ca->raw_dn.data;
  tmp.size = ca->raw_dn.size;

  newsize = list->x509_rdn_sequence.size + 2 + tmp.size;
  if (newsize < list->x509_rdn_sequence.size) {
    gnutls_assert();
    return GNUTLS_E_SHORT_MEMORY_BUFFER;
  }

  newdata = gnutls_realloc_fast(list->x509_rdn_sequence.data, newsize);
  if (newdata == NULL) {
    gnutls_assert();
    return GNUTLS_E_MEMORY_ERROR;
  }

  p = newdata + list->x509_rdn_sequence.size;
  _gnutls_write_uint16(tmp.size, p);
  if (tmp.data != NULL)
    memcpy(p + 2, tmp.data, tmp.size);

  list->x509_rdn_sequence.size = newsize;
  list->x509_rdn_sequence.data = newdata;

  return 0;
}

#ifdef ENABLE_PKCS11
/* Keeps the provided certificate in a structure that will be
 * deallocated on deinit. This is to handle get_issuer() with
 * pkcs11 trust modules when the GNUTLS_TL_GET_COPY flag isn't
 * given. It is not thread safe. */
static int
trust_list_add_compat(gnutls_x509_trust_list_t list, gnutls_x509_crt_t cert)
{
  if (unlikely(INT_ADD_OVERFLOW(list->keep_certs_size, 1))) {
    return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
  }

  list->keep_certs =
      _gnutls_reallocarray_fast(list->keep_certs,
              list->keep_certs_size + 1,
              sizeof(list->keep_certs[0]));
  if (list->keep_certs == NULL) {
    gnutls_assert();
    return GNUTLS_E_MEMORY_ERROR;
  }

  list->keep_certs[list->keep_certs_size] = cert;
  list->keep_certs_size++;

  return 0;
}
#endif

/**
 * gnutls_x509_trust_list_add_cas:
 * @list: The list
 * @clist: A list of CAs
 * @clist_size: The length of the CA list
 * @flags: flags from %gnutls_trust_list_flags_t
 *
 * This function will add the given certificate authorities
 * to the trusted list. The CAs in @clist must not be deinitialized
 * during the lifetime of @list.
 *
 * If the flag %GNUTLS_TL_NO_DUPLICATES is specified, then
 * this function will ensure that no duplicates will be
 * present in the final trust list.
 *
 * If the flag %GNUTLS_TL_NO_DUPLICATE_KEY is specified, then
 * this function will ensure that no certificates with the
 * same key are present in the final trust list.
 *
 * If either %GNUTLS_TL_NO_DUPLICATE_KEY or %GNUTLS_TL_NO_DUPLICATES
 * are given, gnutls_x509_trust_list_deinit() must be called with parameter
 * @all being 1.
 *
 * Returns: The number of added elements is returned; that includes
 *          duplicate entries.
 *
 * Since: 3.0.0
 **/
int
gnutls_x509_trust_list_add_cas(gnutls_x509_trust_list_t list,
             const gnutls_x509_crt_t * clist,
             unsigned clist_size, unsigned int flags)
{
  unsigned i, j;
  size_t hash;
  int ret;
  unsigned exists;

  for (i = 0; i < clist_size; i++) {
    exists = 0;
    hash =
        hash_pjw_bare(clist[i]->raw_dn.data, clist[i]->raw_dn.size);
    hash %= list->size;

    /* avoid duplicates */
    if (flags & GNUTLS_TL_NO_DUPLICATES
        || flags & GNUTLS_TL_NO_DUPLICATE_KEY) {
      for (j = 0; j < list->node[hash].trusted_ca_size; j++) {
        if (flags & GNUTLS_TL_NO_DUPLICATES)
          ret =
              gnutls_x509_crt_equals(list->node
                   [hash].trusted_cas
                   [j],
                   clist[i]);
        else
          ret =
              _gnutls_check_if_same_key(list->node
                      [hash].trusted_cas
                      [j],
                      clist[i],
                      1);
        if (ret != 0) {
          exists = 1;
          break;
        }
      }

      if (exists != 0) {
        gnutls_x509_crt_deinit(list->
                   node[hash].trusted_cas
                   [j]);
        list->node[hash].trusted_cas[j] = clist[i];
        continue;
      }
    }

    if (unlikely
        (INT_ADD_OVERFLOW(list->node[hash].trusted_ca_size, 1))) {
      gnutls_assert();
      return i;
    }

    list->node[hash].trusted_cas =
        _gnutls_reallocarray_fast(list->node[hash].trusted_cas,
                list->node[hash].trusted_ca_size +
                1,
                sizeof(list->
                 node[hash].trusted_cas
                 [0]));
    if (list->node[hash].trusted_cas == NULL) {
      gnutls_assert();
      return i;
    }

    if (gnutls_x509_crt_get_version(clist[i]) >= 3 &&
        gnutls_x509_crt_get_ca_status(clist[i], NULL) <= 0) {
      gnutls_datum_t dn;
      gnutls_assert();
      if (gnutls_x509_crt_get_dn2(clist[i], &dn) >= 0) {
        _gnutls_audit_log(NULL,
              "There was a non-CA certificate in the trusted list: %s.\n",
              dn.data);
        gnutls_free(dn.data);
      }
    }

    list->node[hash].trusted_cas[list->node[hash].trusted_ca_size] =
        clist[i];
    list->node[hash].trusted_ca_size++;

    if (flags & GNUTLS_TL_USE_IN_TLS) {
      ret = add_new_ca_to_rdn_seq(list, clist[i]);
      if (ret < 0) {
        gnutls_assert();
        return i + 1;
      }
    }
  }

  return i;
}

static int
advance_iter(gnutls_x509_trust_list_t list, gnutls_x509_trust_list_iter_t iter)
{
  if (iter->node_index < list->size) {
    ++iter->ca_index;

    /* skip entries */
    while (iter->node_index < list->size &&
           iter->ca_index >=
           list->node[iter->node_index].trusted_ca_size) {
      ++iter->node_index;
      iter->ca_index = 0;
    }

    if (iter->node_index < list->size)
      return 0;
  }

#ifdef ENABLE_PKCS11
  if (list->pkcs11_token != NULL) {
    if (iter->pkcs11_list == NULL) {
      int ret =
          gnutls_pkcs11_obj_list_import_url2
          (&iter->pkcs11_list,
           &iter->pkcs11_size,
           list->pkcs11_token,
           (GNUTLS_PKCS11_OBJ_FLAG_PRESENT_IN_TRUSTED_MODULE
            |
            GNUTLS_PKCS11_OBJ_FLAG_CRT
            |
            GNUTLS_PKCS11_OBJ_FLAG_MARK_CA
            | GNUTLS_PKCS11_OBJ_FLAG_MARK_TRUSTED),
           0);
      if (ret < 0)
        return gnutls_assert_val(ret);

      if (iter->pkcs11_size > 0)
        return 0;
    } else if (iter->pkcs11_index < iter->pkcs11_size) {
      ++iter->pkcs11_index;
      if (iter->pkcs11_index < iter->pkcs11_size)
        return 0;
    }
  }
#endif

  return gnutls_assert_val(GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE);
}

/**
 * gnutls_x509_trust_list_iter_get_ca:
 * @list: The list
 * @iter: A pointer to an iterator (initially the iterator should be %NULL)
 * @crt: where the certificate will be copied
 *
 * This function obtains a certificate in the trust list and advances the
 * iterator to the next certificate. The certificate returned in @crt must be
 * deallocated with gnutls_x509_crt_deinit().
 *
 * When past the last element is accessed %GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE
 * is returned and the iterator is reset.
 *
 * The iterator is deinitialized and reset to %NULL automatically by this
 * function after iterating through all elements until
 * %GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE is returned. If the iteration is
 * aborted early, it must be manually deinitialized using
 * gnutls_x509_trust_list_iter_deinit().
 *
 * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise a
 *   negative error value.
 *
 * Since: 3.4.0
 **/
int
gnutls_x509_trust_list_iter_get_ca(gnutls_x509_trust_list_t list,
           gnutls_x509_trust_list_iter_t * iter,
           gnutls_x509_crt_t * crt)
{
  int ret;

  /* initialize iterator */
  if (*iter == NULL) {
    *iter =
        gnutls_malloc(sizeof(struct gnutls_x509_trust_list_iter));
    if (*iter == NULL)
      return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);

    (*iter)->node_index = 0;
    (*iter)->ca_index = 0;

#ifdef ENABLE_PKCS11
    (*iter)->pkcs11_list = NULL;
    (*iter)->pkcs11_size = 0;
    (*iter)->pkcs11_index = 0;
#endif

    /* Advance iterator to the first valid entry */
    if (list->node[0].trusted_ca_size == 0) {
      ret = advance_iter(list, *iter);
      if (ret != 0) {
        gnutls_x509_trust_list_iter_deinit(*iter);
        *iter = NULL;

        *crt = NULL;
        return gnutls_assert_val(ret);
      }
    }
  }

  /* obtain the certificate at the current iterator position */
  if ((*iter)->node_index < list->size) {
    ret = gnutls_x509_crt_init(crt);
    if (ret < 0)
      return gnutls_assert_val(ret);

    ret =
        _gnutls_x509_crt_cpy(*crt,
           list->node[(*iter)->
                node_index].trusted_cas[(*iter)->ca_index]);
    if (ret < 0) {
      gnutls_x509_crt_deinit(*crt);
      return gnutls_assert_val(ret);
    }
  }
#ifdef ENABLE_PKCS11
  else if ((*iter)->pkcs11_index < (*iter)->pkcs11_size) {
    ret = gnutls_x509_crt_init(crt);
    if (ret < 0)
      return gnutls_assert_val(ret);

    ret =
        gnutls_x509_crt_import_pkcs11(*crt,
              (*iter)->
              pkcs11_list[(*iter)->pkcs11_index]);
    if (ret < 0) {
      gnutls_x509_crt_deinit(*crt);
      return gnutls_assert_val(ret);
    }
  }
#endif

  else {
    /* iterator is at end */
    gnutls_x509_trust_list_iter_deinit(*iter);
    *iter = NULL;

    *crt = NULL;
    return gnutls_assert_val(GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE);
  }

  /* Move iterator to the next position.
   * GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE is returned if the iterator
   * has been moved to the end position. That is okay, we return the
   * certificate that we read and when this function is called again we
   * report GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE to our caller. */
  ret = advance_iter(list, *iter);
  if (ret < 0 && ret != GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
    gnutls_x509_crt_deinit(*crt);
    *crt = NULL;

    return gnutls_assert_val(ret);
  }

  return 0;
}

/**
 * gnutls_x509_trust_list_iter_deinit:
 * @iter: The iterator structure to be deinitialized
 *
 * This function will deinitialize an iterator structure.
 *
 * Since: 3.4.0
 **/
void gnutls_x509_trust_list_iter_deinit(gnutls_x509_trust_list_iter_t iter)
{
  if (!iter)
    return;

#ifdef ENABLE_PKCS11
  if (iter->pkcs11_size > 0) {
    unsigned i;
    for (i = 0; i < iter->pkcs11_size; ++i)
      gnutls_pkcs11_obj_deinit(iter->pkcs11_list[i]);
    gnutls_free(iter->pkcs11_list);
  }
#endif

  gnutls_free(iter);
}

static gnutls_x509_crt_t crt_cpy(gnutls_x509_crt_t src)
{
  gnutls_x509_crt_t dst;
  int ret;

  ret = gnutls_x509_crt_init(&dst);
  if (ret < 0) {
    gnutls_assert();
    return NULL;
  }

  ret = _gnutls_x509_crt_cpy(dst, src);
  if (ret < 0) {
    gnutls_x509_crt_deinit(dst);
    gnutls_assert();
    return NULL;
  }

  return dst;
}

/**
 * gnutls_x509_trust_list_remove_cas:
 * @list: The list
 * @clist: A list of CAs
 * @clist_size: The length of the CA list
 *
 * This function will remove the given certificate authorities
 * from the trusted list.
 *
 * Note that this function can accept certificates and authorities
 * not yet known. In that case they will be kept in a separate
 * block list that will be used during certificate verification.
 * Unlike gnutls_x509_trust_list_add_cas() there is no deinitialization
 * restriction for  certificate list provided in this function.
 *
 * Returns: The number of removed elements is returned.
 *
 * Since: 3.1.10
 **/
int
gnutls_x509_trust_list_remove_cas(gnutls_x509_trust_list_t list,
          const gnutls_x509_crt_t * clist,
          unsigned clist_size)
{
  int r = 0;
  unsigned j, i;
  size_t hash;

  for (i = 0; i < clist_size; i++) {
    hash =
        hash_pjw_bare(clist[i]->raw_dn.data, clist[i]->raw_dn.size);
    hash %= list->size;

    for (j = 0; j < list->node[hash].trusted_ca_size; j++) {
      if (gnutls_x509_crt_equals
          (clist[i], list->node[hash].trusted_cas[j]) != 0) {

        gnutls_x509_crt_deinit(list->node[hash].
                   trusted_cas[j]);
        list->node[hash].trusted_cas[j] =
            list->node[hash].trusted_cas[list->
                 node[hash].
                 trusted_ca_size
                 - 1];
        list->node[hash].trusted_ca_size--;
        r++;
        break;
      }
    }

    if (unlikely(INT_ADD_OVERFLOW(list->distrusted_size, 1))) {
      return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
    }

    /* Add the CA (or plain) certificate to the block list as well.
     * This will prevent a subordinate CA from being valid, and
     * ensure that a server certificate will also get rejected.
     */
    list->distrusted =
        _gnutls_reallocarray_fast(list->distrusted,
                list->distrusted_size + 1,
                sizeof(list->distrusted[0]));
    if (list->distrusted == NULL)
      return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);

    list->distrusted[list->distrusted_size] = crt_cpy(clist[i]);
    if (list->distrusted[list->distrusted_size] != NULL)
      list->distrusted_size++;
  }

  return r;
}

/**
 * gnutls_x509_trust_list_add_named_crt:
 * @list: The list
 * @cert: A certificate
 * @name: An identifier for the certificate
 * @name_size: The size of the identifier
 * @flags: should be 0.
 *
 * This function will add the given certificate to the trusted
 * list and associate it with a name. The certificate will not be
 * be used for verification with gnutls_x509_trust_list_verify_crt()
 * but with gnutls_x509_trust_list_verify_named_crt() or
 * gnutls_x509_trust_list_verify_crt2() - the latter only since
 * GnuTLS 3.4.0 and if a hostname is provided.
 *
 * In principle this function can be used to set individual "server"
 * certificates that are trusted by the user for that specific server
 * but for no other purposes.
 *
 * The certificate @cert must not be deinitialized during the lifetime
 * of the @list.
 *
 * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise a
 *   negative error value.
 *
 * Since: 3.0.0
 **/
int
gnutls_x509_trust_list_add_named_crt(gnutls_x509_trust_list_t list,
             gnutls_x509_crt_t cert,
             const void *name, size_t name_size,
             unsigned int flags)
{
  size_t hash;

  if (name_size >= MAX_SERVER_NAME_SIZE)
    return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);

  hash =
      hash_pjw_bare(cert->raw_issuer_dn.data, cert->raw_issuer_dn.size);
  hash %= list->size;

  if (unlikely(INT_ADD_OVERFLOW(list->node[hash].named_cert_size, 1))) {
    return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
  }

  list->node[hash].named_certs =
      _gnutls_reallocarray_fast(list->node[hash].named_certs,
              list->node[hash].named_cert_size + 1,
              sizeof(list->node[hash].named_certs[0]));
  if (list->node[hash].named_certs == NULL)
    return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);

  list->node[hash].named_certs[list->node[hash].named_cert_size].cert =
      cert;
  memcpy(list->node[hash].
         named_certs[list->node[hash].named_cert_size].name, name,
         name_size);
  list->node[hash].named_certs[list->node[hash].
             named_cert_size].name_size = name_size;

  list->node[hash].named_cert_size++;

  return 0;
}

/**
 * gnutls_x509_trust_list_add_crls:
 * @list: The list
 * @crl_list: A list of CRLs
 * @crl_size: The length of the CRL list
 * @flags: flags from %gnutls_trust_list_flags_t
 * @verification_flags: gnutls_certificate_verify_flags if flags specifies GNUTLS_TL_VERIFY_CRL
 *
 * This function will add the given certificate revocation lists
 * to the trusted list. The CRLs in @crl_list must not be deinitialized
 * during the lifetime of @list.
 *
 * This function must be called after gnutls_x509_trust_list_add_cas()
 * to allow verifying the CRLs for validity. If the flag %GNUTLS_TL_NO_DUPLICATES
 * is given, then the final CRL list will not contain duplicate entries.
 *
 * If the flag %GNUTLS_TL_NO_DUPLICATES is given, gnutls_x509_trust_list_deinit() must be
 * called with parameter @all being 1.
 *
 * If flag %GNUTLS_TL_VERIFY_CRL is given the CRLs will be verified before being added,
 * and if verification fails, they will be skipped.
 *
 * Returns: The number of added elements is returned; that includes
 *          duplicate entries.
 *
 * Since: 3.0
 **/
int
gnutls_x509_trust_list_add_crls(gnutls_x509_trust_list_t list,
        const gnutls_x509_crl_t * crl_list,
        unsigned crl_size, unsigned int flags,
        unsigned int verification_flags)
{
  int ret;
  unsigned x, i, j = 0;
  unsigned int vret = 0;
  size_t hash;
  gnutls_x509_crl_t *tmp;

  /* Probably we can optimize things such as removing duplicates
   * etc.
   */
  if (crl_size == 0 || crl_list == NULL)
    return 0;

  for (i = 0; i < crl_size; i++) {
    hash =
        hash_pjw_bare(crl_list[i]->raw_issuer_dn.data,
          crl_list[i]->raw_issuer_dn.size);
    hash %= list->size;

    if (flags & GNUTLS_TL_VERIFY_CRL) {

      ret =
          gnutls_x509_crl_verify(crl_list[i],
               list->node[hash].trusted_cas,
               list->node[hash].
               trusted_ca_size,
               verification_flags, &vret);
      if (ret < 0 || vret != 0) {
        _gnutls_debug_log
            ("CRL verification failed, not adding it\n");
        if (flags & GNUTLS_TL_NO_DUPLICATES)
          gnutls_x509_crl_deinit(crl_list[i]);
        if (flags & GNUTLS_TL_FAIL_ON_INVALID_CRL)
          return
              gnutls_assert_val
              (GNUTLS_E_CRL_VERIFICATION_ERROR);
        continue;
      }
    }

    /* If the CRL added overrides a previous one, then overwrite
     * the old one */
    if (flags & GNUTLS_TL_NO_DUPLICATES) {
      for (x = 0; x < list->node[hash].crl_size; x++) {
        if (crl_list[i]->raw_issuer_dn.size ==
            list->node[hash].crls[x]->raw_issuer_dn.size
            && memcmp(crl_list[i]->raw_issuer_dn.data,
                list->node[hash].
                crls[x]->raw_issuer_dn.data,
                crl_list[i]->
                raw_issuer_dn.size) == 0) {
          if (gnutls_x509_crl_get_this_update
              (crl_list[i]) >=
              gnutls_x509_crl_get_this_update
              (list->node[hash].crls[x])) {

            gnutls_x509_crl_deinit
                (list->node[hash].crls[x]);
            list->node[hash].crls[x] =
                crl_list[i];
            goto next;
          } else {
            /* The new is older, discard it */
            gnutls_x509_crl_deinit(crl_list
                       [i]);
            goto next;
          }
        }
      }
    }

    if (unlikely(INT_ADD_OVERFLOW(list->node[hash].crl_size, 1))) {
      gnutls_assert();
      goto error;
    }

    tmp = _gnutls_reallocarray(list->node[hash].crls,
             list->node[hash].crl_size + 1,
             sizeof(list->node[hash].crls[0]));
    if (tmp == NULL) {
      gnutls_assert();
      goto error;
    }
    list->node[hash].crls = tmp;

    list->node[hash].crls[list->node[hash].crl_size] = crl_list[i];
    list->node[hash].crl_size++;

 next:
    j++;
  }

  return j;

 error:
  ret = i;
  if (flags & GNUTLS_TL_NO_DUPLICATES)
    while (i < crl_size)
      gnutls_x509_crl_deinit(crl_list[i++]);
  return ret;
}

/* Takes a certificate list and shortens it if there are
 * intermedia certificates already trusted by us.
 *
 * Returns the new size of the list or a negative number on error.
 */
static int shorten_clist(gnutls_x509_trust_list_t list,
       gnutls_x509_crt_t * certificate_list,
       unsigned int clist_size)
{
  unsigned int j, i;
  size_t hash;

  if (clist_size > 1) {
    /* Check if the last certificate in the path is self signed.
     * In that case ignore it (a certificate is trusted only if it
     * leads to a trusted party by us, not the server's).
     *
     * This prevents from verifying self signed certificates against
     * themselves. This (although not bad) caused verification
     * failures on some root self signed certificates that use the
     * MD2 algorithm.
     */
    if (gnutls_x509_crt_check_issuer
        (certificate_list[clist_size - 1],
         certificate_list[clist_size - 1]) != 0) {
      clist_size--;
    }
  }

  /* We want to shorten the chain by removing the cert that matches
   * one of the certs we trust and all the certs after that i.e. if
   * cert chain is A signed-by B signed-by C signed-by D (signed-by
   * self-signed E but already removed above), and we trust B, remove
   * B, C and D. */
  for (i = 1; i < clist_size; i++) {
    hash =
        hash_pjw_bare(certificate_list[i]->raw_issuer_dn.data,
          certificate_list[i]->raw_issuer_dn.size);
    hash %= list->size;

    for (j = 0; j < list->node[hash].trusted_ca_size; j++) {
      if (gnutls_x509_crt_equals
          (certificate_list[i],
           list->node[hash].trusted_cas[j]) != 0) {
        /* cut the list at the point of first the trusted certificate */
        clist_size = i + 1;
        break;
      }
    }
    /* clist_size may have been changed which gets out of loop */
  }

  return clist_size;
}

/* Takes a subject certificate, retrieves a chain from its issuers in
 * @certificate_list, using the issuer callback set for @list.
 *
 * Returns the new size of the list or a negative number on error.
 */
static int
retrieve_issuers(gnutls_x509_trust_list_t list,
     gnutls_x509_crt_t subject,
     gnutls_x509_crt_t * certificate_list,
     unsigned int clist_size_max)
{
  gnutls_x509_crt_t *issuers;
  unsigned int issuers_size;
  unsigned int i;
  int ret;

  if (!list->issuer_callback) {
    return 0;
  }

  _gnutls_cert_log("calling issuer callback on", subject);

  ret = list->issuer_callback(list, subject, &issuers, &issuers_size);
  if (ret < 0) {
    return gnutls_assert_val(ret);
  }

  /* Ignore empty list */
  if (!issuers_size) {
    ret = 0;
    goto cleanup;
  }

  if (issuers_size > clist_size_max) {
    _gnutls_debug_log("too many issuers returned; skipping\n");
    ret = 0;
    goto cleanup;
  }

  for (i = 0; i < issuers_size; i++) {
    if (!gnutls_x509_crt_check_issuer(subject, issuers[i])) {
      _gnutls_cert_log("unrelated certificate; skipping",
           issuers[i]);
      break;
    }
    subject = issuers[i];
  }

  ret = i;

  memcpy(certificate_list, issuers, ret * sizeof(gnutls_x509_crt_t));

 cleanup:
  for (i = ret; i < issuers_size; i++) {
    gnutls_x509_crt_deinit(issuers[i]);
  }
  gnutls_free(issuers);

  return ret;
}

int _gnutls_trust_list_get_issuer(gnutls_x509_trust_list_t list,
          gnutls_x509_crt_t cert,
          gnutls_x509_crt_t * issuer,
          unsigned int flags)
{
  int ret;
  unsigned int i;
  size_t hash;

  hash =
      hash_pjw_bare(cert->raw_issuer_dn.data, cert->raw_issuer_dn.size);
  hash %= list->size;

  for (i = 0; i < list->node[hash].trusted_ca_size; i++) {
    ret =
        gnutls_x509_crt_check_issuer(cert,
             list->node[hash].
             trusted_cas[i]);
    if (ret != 0) {
      if (flags & GNUTLS_TL_GET_COPY) {
        *issuer =
            crt_cpy(list->node[hash].trusted_cas[i]);
      } else {
        *issuer = list->node[hash].trusted_cas[i];
      }
      return 0;
    }
  }

  return GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE;
}

static
int trust_list_get_issuer_by_dn(gnutls_x509_trust_list_t list,
        const gnutls_datum_t * dn,
        const gnutls_datum_t * spki,
        gnutls_x509_crt_t * issuer, unsigned int flags)
{
  int ret;
  unsigned int i, j;
  size_t hash;
  uint8_t tmp[256];
  size_t tmp_size;

  if (dn) {
    hash = hash_pjw_bare(dn->data, dn->size);
    hash %= list->size;

    for (i = 0; i < list->node[hash].trusted_ca_size; i++) {
      ret =
          _gnutls_x509_compare_raw_dn(dn,
              &list->
              node[hash].trusted_cas
              [i]->raw_dn);
      if (ret != 0) {
        if (spki && spki->size > 0) {
          tmp_size = sizeof(tmp);

          ret =
              gnutls_x509_crt_get_subject_key_id
              (list->node[hash].trusted_cas[i],
               tmp, &tmp_size, NULL);
          if (ret < 0)
            continue;
          if (spki->size != tmp_size
              || memcmp(spki->data, tmp,
                  spki->size) != 0)
            continue;
        }
        *issuer =
            crt_cpy(list->node[hash].trusted_cas[i]);
        return 0;
      }
    }
  } else if (spki) {
    /* search everything! */
    for (i = 0; i < list->size; i++) {
      for (j = 0; j < list->node[i].trusted_ca_size; j++) {
        tmp_size = sizeof(tmp);

        ret =
            gnutls_x509_crt_get_subject_key_id
            (list->node[i].trusted_cas[j], tmp,
             &tmp_size, NULL);
        if (ret < 0)
          continue;

        if (spki->size != tmp_size
            || memcmp(spki->data, tmp, spki->size) != 0)
          continue;

        *issuer = crt_cpy(list->node[i].trusted_cas[j]);
        return 0;
      }
    }
  }

  return GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE;
}

/**
 * gnutls_x509_trust_list_get_issuer:
 * @list: The list
 * @cert: is the certificate to find issuer for
 * @issuer: Will hold the issuer if any. Should be treated as constant
 *   unless %GNUTLS_TL_GET_COPY is set in @flags.
 * @flags: flags from %gnutls_trust_list_flags_t (%GNUTLS_TL_GET_COPY is applicable)
 *
 * This function will find the issuer of the given certificate.
 * If the flag %GNUTLS_TL_GET_COPY is specified a copy of the issuer
 * will be returned which must be freed using gnutls_x509_crt_deinit().
 * In that case the provided @issuer must not be initialized.
 *
 * Note that the flag %GNUTLS_TL_GET_COPY is required for this function
 * to work with PKCS#11 trust lists in a thread-safe way.
 *
 * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise a
 *   negative error value.
 *
 * Since: 3.0
 **/
int gnutls_x509_trust_list_get_issuer(gnutls_x509_trust_list_t list,
              gnutls_x509_crt_t cert,
              gnutls_x509_crt_t * issuer,
              unsigned int flags)
{
  int ret;

  ret = _gnutls_trust_list_get_issuer(list, cert, issuer, flags);
  if (ret == 0) {
    return 0;
  }

#ifdef ENABLE_PKCS11
  if (ret < 0 && list->pkcs11_token) {
    gnutls_x509_crt_t crt;
    gnutls_datum_t der = { NULL, 0 };
    /* use the token for verification */
    ret =
        gnutls_pkcs11_get_raw_issuer(list->pkcs11_token, cert, &der,
             GNUTLS_X509_FMT_DER,
             GNUTLS_PKCS11_OBJ_FLAG_PRESENT_IN_TRUSTED_MODULE);
    if (ret < 0) {
      gnutls_assert();
      return ret;
    }

    ret = gnutls_x509_crt_init(&crt);
    if (ret < 0) {
      gnutls_free(der.data);
      return gnutls_assert_val(ret);
    }

    ret = gnutls_x509_crt_import(crt, &der, GNUTLS_X509_FMT_DER);
    gnutls_free(der.data);
    if (ret < 0) {
      gnutls_x509_crt_deinit(crt);
      return gnutls_assert_val(ret);
    }

    if (flags & GNUTLS_TL_GET_COPY) {
      *issuer = crt;
      return 0;
    } else {
      /* we add this CA to the keep_cert list in order to make it
       * persistent. It will be deallocated when the trust list is.
       */
      ret = trust_list_add_compat(list, crt);
      if (ret < 0) {
        gnutls_x509_crt_deinit(crt);
        return gnutls_assert_val(ret);
      }
      *issuer = crt;
      return ret;
    }
  }
#endif
  return ret;
}

/**
 * gnutls_x509_trust_list_get_issuer_by_dn:
 * @list: The list
 * @dn: is the issuer's DN
 * @issuer: Will hold the issuer if any. Should be deallocated after use.
 * @flags: Use zero
 *
 * This function will find the issuer with the given name, and
 * return a copy of the issuer, which must be freed using gnutls_x509_crt_deinit().
 *
 * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise a
 *   negative error value.
 *
 * Since: 3.4.0
 **/
int gnutls_x509_trust_list_get_issuer_by_dn(gnutls_x509_trust_list_t list,
              const gnutls_datum_t * dn,
              gnutls_x509_crt_t * issuer,
              unsigned int flags)
{
  int ret;

  ret = trust_list_get_issuer_by_dn(list, dn, NULL, issuer, flags);
  if (ret == 0) {
    return 0;
  }

#ifdef ENABLE_PKCS11
  if (ret < 0 && list->pkcs11_token) {
    gnutls_x509_crt_t crt;
    gnutls_datum_t der = { NULL, 0 };
    /* use the token for verification */
    ret =
        gnutls_pkcs11_get_raw_issuer_by_dn(list->pkcs11_token, dn,
                   &der,
                   GNUTLS_X509_FMT_DER,
                   GNUTLS_PKCS11_OBJ_FLAG_PRESENT_IN_TRUSTED_MODULE);
    if (ret < 0) {
      gnutls_assert();
      return ret;
    }

    ret = gnutls_x509_crt_init(&crt);
    if (ret < 0) {
      gnutls_free(der.data);
      return gnutls_assert_val(ret);
    }

    ret = gnutls_x509_crt_import(crt, &der, GNUTLS_X509_FMT_DER);
    gnutls_free(der.data);
    if (ret < 0) {
      gnutls_x509_crt_deinit(crt);
      return gnutls_assert_val(ret);
    }

    *issuer = crt;
    return 0;
  }
#endif
  return ret;
}

/**
 * gnutls_x509_trust_list_get_issuer_by_subject_key_id:
 * @list: The list
 * @dn: is the issuer's DN (may be %NULL)
 * @spki: is the subject key ID
 * @issuer: Will hold the issuer if any. Should be deallocated after use.
 * @flags: Use zero
 *
 * This function will find the issuer with the given name and subject key ID, and
 * return a copy of the issuer, which must be freed using gnutls_x509_crt_deinit().
 *
 * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise a
 *   negative error value.
 *
 * Since: 3.4.2
 **/
int gnutls_x509_trust_list_get_issuer_by_subject_key_id(gnutls_x509_trust_list_t
              list,
              const gnutls_datum_t *
              dn,
              const gnutls_datum_t *
              spki,
              gnutls_x509_crt_t *
              issuer,
              unsigned int flags)
{
  int ret;

  ret = trust_list_get_issuer_by_dn(list, dn, spki, issuer, flags);
  if (ret == 0) {
    return 0;
  }

#ifdef ENABLE_PKCS11
  if (ret < 0 && list->pkcs11_token) {
    gnutls_x509_crt_t crt;
    gnutls_datum_t der = { NULL, 0 };
    /* use the token for verification */
    ret =
        gnutls_pkcs11_get_raw_issuer_by_subject_key_id
        (list->pkcs11_token, dn, spki, &der, GNUTLS_X509_FMT_DER,
         GNUTLS_PKCS11_OBJ_FLAG_PRESENT_IN_TRUSTED_MODULE);
    if (ret < 0) {
      gnutls_assert();
      return ret;
    }

    ret = gnutls_x509_crt_init(&crt);
    if (ret < 0) {
      gnutls_free(der.data);
      return gnutls_assert_val(ret);
    }

    ret = gnutls_x509_crt_import(crt, &der, GNUTLS_X509_FMT_DER);
    gnutls_free(der.data);
    if (ret < 0) {
      gnutls_x509_crt_deinit(crt);
      return gnutls_assert_val(ret);
    }

    *issuer = crt;
    return 0;
  }
#endif
  return ret;
}

static
int check_if_in_blocklist(gnutls_x509_crt_t * cert_list,
        unsigned int cert_list_size,
        gnutls_x509_crt_t * blocklist,
        unsigned int blocklist_size)
{
  unsigned i, j;

  if (blocklist_size == 0)
    return 0;

  for (i = 0; i < cert_list_size; i++) {
    for (j = 0; j < blocklist_size; j++) {
      if (gnutls_x509_crt_equals(cert_list[i], blocklist[j])
          != 0) {
        return 1;
      }
    }
  }

  return 0;
}

/**
 * gnutls_x509_trust_list_verify_crt:
 * @list: The list
 * @cert_list: is the certificate list to be verified
 * @cert_list_size: is the certificate list size
 * @flags: Flags that may be used to change the verification algorithm. Use OR of the gnutls_certificate_verify_flags enumerations.
 * @voutput: will hold the certificate verification output.
 * @func: If non-null will be called on each chain element verification with the output.
 *
 * This function will try to verify the given certificate and return
 * its status. The @voutput parameter will hold an OR'ed sequence of
 * %gnutls_certificate_status_t flags.
 *
 * The details of the verification are the same as in gnutls_x509_trust_list_verify_crt2().
 *
 * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise a
 *   negative error value.
 *
 * Since: 3.0
 **/
int
gnutls_x509_trust_list_verify_crt(gnutls_x509_trust_list_t list,
          gnutls_x509_crt_t * cert_list,
          unsigned int cert_list_size,
          unsigned int flags,
          unsigned int *voutput,
          gnutls_verify_output_function func)
{
  return gnutls_x509_trust_list_verify_crt2(list, cert_list,
              cert_list_size, NULL, 0,
              flags, voutput, func);
}

#define LAST_DN cert_list[cert_list_size-1]->raw_dn
#define LAST_IDN cert_list[cert_list_size-1]->raw_issuer_dn
/* This macro is introduced to detect a verification output which
 * indicates an unknown signer, a signer which uses an insecure
 * algorithm (e.g., sha1), a signer has expired, or something that
 * indicates a superseded signer */
#define SIGNER_OLD_OR_UNKNOWN(output) ((output & GNUTLS_CERT_SIGNER_NOT_FOUND) || \
               (output & GNUTLS_CERT_EXPIRED) || \
               (output & GNUTLS_CERT_INSECURE_ALGORITHM))
#define SIGNER_WAS_KNOWN(output) (!(output & GNUTLS_CERT_SIGNER_NOT_FOUND))

/**
 * gnutls_x509_trust_list_verify_crt2:
 * @list: The list
 * @cert_list: is the certificate list to be verified
 * @cert_list_size: is the certificate list size
 * @data: an array of typed data
 * @elements: the number of data elements
 * @flags: Flags that may be used to change the verification algorithm. Use OR of the gnutls_certificate_verify_flags enumerations.
 * @voutput: will hold the certificate verification output.
 * @func: If non-null will be called on each chain element verification with the output.
 *
 * This function will attempt to verify the given certificate chain and return
 * its status. The @voutput parameter will hold an OR'ed sequence of
 * %gnutls_certificate_status_t flags.
 *
 * When a certificate chain of @cert_list_size with more than one certificates is
 * provided, the verification status will apply to the first certificate in the chain
 * that failed verification. The verification process starts from the end of the chain
 * (from CA to end certificate). The first certificate in the chain must be the end-certificate
 * while the rest of the members may be sorted or not.
 *
 * Additionally a certificate verification profile can be specified
 * from the ones in %gnutls_certificate_verification_profiles_t by
 * ORing the result of GNUTLS_PROFILE_TO_VFLAGS() to the verification
 * flags.
 *
 * Additional verification parameters are possible via the @data types; the
 * acceptable types are %GNUTLS_DT_DNS_HOSTNAME, %GNUTLS_DT_IP_ADDRESS and %GNUTLS_DT_KEY_PURPOSE_OID.
 * The former accepts as data a null-terminated hostname, and the latter a null-terminated
 * object identifier (e.g., %GNUTLS_KP_TLS_WWW_SERVER).
 * If a DNS hostname is provided then this function will compare
 * the hostname in the end certificate against the given. If names do not match the
 * %GNUTLS_CERT_UNEXPECTED_OWNER status flag will be set. In addition it
 * will consider certificates provided with gnutls_x509_trust_list_add_named_crt().
 *
 * If a key purpose OID is provided and the end-certificate contains the extended key
 * usage PKIX extension, it will be required to match the provided OID
 * or be marked for any purpose, otherwise verification will fail with 
 * %GNUTLS_CERT_PURPOSE_MISMATCH status.
 *
 * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise a
 *   negative error value. Note that verification failure will not result to an
 *   error code, only @voutput will be updated.
 *
 * Since: 3.3.8
 **/
int
gnutls_x509_trust_list_verify_crt2(gnutls_x509_trust_list_t list,
           gnutls_x509_crt_t * cert_list,
           unsigned int cert_list_size,
           gnutls_typed_vdata_st * data,
           unsigned int elements,
           unsigned int flags,
           unsigned int *voutput,
           gnutls_verify_output_function func)
{
  int ret = 0;
  unsigned int i;
  size_t hash;
  gnutls_x509_crt_t sorted[DEFAULT_MAX_VERIFY_DEPTH];
  gnutls_x509_crt_t retrieved[DEFAULT_MAX_VERIFY_DEPTH];
  unsigned int retrieved_size = 0;
  const char *hostname = NULL, *purpose = NULL, *email = NULL;
  unsigned hostname_size = 0;
  unsigned have_set_name = 0;
  unsigned saved_output;
  gnutls_datum_t ip = { NULL, 0 };
  gl_list_t records;

  if (cert_list == NULL || cert_list_size < 1)
    return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);

  for (i = 0; i < elements; i++) {
    if (data[i].type == GNUTLS_DT_DNS_HOSTNAME) {
      hostname = (void *)data[i].data;
      if (data[i].size > 0) {
        hostname_size = data[i].size;
      }

      if (have_set_name != 0)
        return
            gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
      have_set_name = 1;
    } else if (data[i].type == GNUTLS_DT_IP_ADDRESS) {
      if (data[i].size > 0) {
        ip.data = data[i].data;
        ip.size = data[i].size;
      }

      if (have_set_name != 0)
        return
            gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
      have_set_name = 1;
    } else if (data[i].type == GNUTLS_DT_RFC822NAME) {
      email = (void *)data[i].data;

      if (have_set_name != 0)
        return
            gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
      have_set_name = 1;
    } else if (data[i].type == GNUTLS_DT_KEY_PURPOSE_OID) {
      purpose = (void *)data[i].data;
    }
  }

  if (hostname) {   /* shortcut using the named certs - if any */
    unsigned vtmp = 0;
    if (hostname_size == 0)
      hostname_size = strlen(hostname);

    ret = gnutls_x509_trust_list_verify_named_crt(list,
                    cert_list[0],
                    hostname,
                    hostname_size,
                    flags, &vtmp,
                    func);
    if (ret == 0 && vtmp == 0) {
      *voutput = vtmp;
      return 0;
    }
  }

  memcpy(sorted, cert_list, cert_list_size * sizeof(gnutls_x509_crt_t));
  cert_list = sorted;

  records =
      gl_list_nx_create_empty(GL_LINKEDHASH_LIST, cert_eq, cert_hashcode,
            NULL, false);
  if (records == NULL)
    return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);

  for (i = 0; i < cert_list_size &&
       cert_list_size <= DEFAULT_MAX_VERIFY_DEPTH;) {
    unsigned int sorted_size = 1;
    unsigned int j;
    gnutls_x509_crt_t issuer;

    if (!(flags & GNUTLS_VERIFY_DO_NOT_ALLOW_UNSORTED_CHAIN)) {
      sorted_size = _gnutls_sort_clist(&cert_list[i],
               cert_list_size - i);
    }

    /* Remove duplicates. Start with index 1, as the first element
     * may be re-checked after issuer retrieval. */
    for (j = 0; j < sorted_size; j++) {
      if (gl_list_search(records, cert_list[i + j])) {
        if (i + j < cert_list_size - 1) {
          memmove(&cert_list[i + j],
            &cert_list[i + j + 1],
            sizeof(cert_list[i]));
        }
        cert_list_size--;
        break;
      }
    }
    /* Found a duplicate, try again with the same index. */
    if (j < sorted_size) {
      continue;
    }

    /* Record the certificates seen. */
    for (j = 0; j < sorted_size; j++, i++) {
      if (!gl_list_nx_add_last(records, cert_list[i])) {
        ret = gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
        goto cleanup;
      }
    }

    /* If the issuer of the certificate is known, no need
     * for further processing. */
    if (gnutls_x509_trust_list_get_issuer(list,
                  cert_list[i - 1],
                  &issuer,
                  GNUTLS_TL_GET_COPY) ==
        0) {
      gnutls_x509_crt_deinit(issuer);
      cert_list_size = i;
      break;
    }

    /* If there is no gap between this and the next certificate,
     * proceed with the next certificate. */
    if (i < cert_list_size &&
        gnutls_x509_crt_check_issuer(cert_list[i - 1],
             cert_list[i])) {
      continue;
    }

    ret = retrieve_issuers(list,
               cert_list[i - 1],
               &retrieved[retrieved_size],
               DEFAULT_MAX_VERIFY_DEPTH -
               MAX(retrieved_size, cert_list_size));
    if (ret < 0) {
      break;
    } else if (ret > 0) {
      assert((unsigned int)ret <=
             DEFAULT_MAX_VERIFY_DEPTH - cert_list_size);
      memmove(&cert_list[i + ret],
        &cert_list[i],
        (cert_list_size - i) *
        sizeof(gnutls_x509_crt_t));
      memcpy(&cert_list[i],
             &retrieved[retrieved_size],
             ret * sizeof(gnutls_x509_crt_t));
      retrieved_size += ret;
      cert_list_size += ret;

      /* Start again from the end of the previous segment. */
      i--;
      gl_list_remove(records, cert_list[i]);
    }
  }

  cert_list_size = shorten_clist(list, cert_list, cert_list_size);
  if (cert_list_size <= 0)
    return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);

  hash =
      hash_pjw_bare(cert_list[cert_list_size - 1]->raw_issuer_dn.data,
        cert_list[cert_list_size - 1]->raw_issuer_dn.size);
  hash %= list->size;

  ret = check_if_in_blocklist(cert_list, cert_list_size,
            list->distrusted, list->distrusted_size);
  if (ret != 0) {
    *voutput = 0;
    *voutput |= GNUTLS_CERT_REVOKED;
    *voutput |= GNUTLS_CERT_INVALID;
    ret = 0;
    goto cleanup;
  }

  *voutput =
      _gnutls_verify_crt_status(list, cert_list, cert_list_size,
              list->node[hash].trusted_cas,
              list->node[hash].trusted_ca_size,
              flags, purpose, func);
  saved_output = *voutput;

  if (SIGNER_OLD_OR_UNKNOWN(*voutput) &&
      (LAST_DN.size != LAST_IDN.size ||
       memcmp(LAST_DN.data, LAST_IDN.data, LAST_IDN.size) != 0)) {

    /* if we couldn't find the issuer, try to see if the last
     * certificate is in the trusted list and try to verify against
     * (if it is not self signed) */
    hash =
        hash_pjw_bare(cert_list[cert_list_size - 1]->raw_dn.data,
          cert_list[cert_list_size - 1]->raw_dn.size);
    hash %= list->size;

    _gnutls_debug_log
        ("issuer in verification was not found or insecure; trying against trust list\n");

    *voutput =
        _gnutls_verify_crt_status(list, cert_list, cert_list_size,
                list->node[hash].trusted_cas,
                list->node[hash].trusted_ca_size,
                flags, purpose, func);
    if (*voutput != 0) {
      if (SIGNER_WAS_KNOWN(saved_output))
        *voutput = saved_output;
      gnutls_assert();
    }
  }

  saved_output = *voutput;

#ifdef ENABLE_PKCS11
  if (SIGNER_OLD_OR_UNKNOWN(*voutput) && list->pkcs11_token) {
    /* use the token for verification */

    *voutput =
        _gnutls_pkcs11_verify_crt_status(list, list->pkcs11_token,
                 cert_list, cert_list_size,
                 purpose, flags, func);
    if (*voutput != 0) {
      if (SIGNER_WAS_KNOWN(saved_output))
        *voutput = saved_output;
      gnutls_assert();
    }
  }
#endif

  /* End-certificate, key purpose and hostname checks. */
  if (purpose) {
    ret = _gnutls_check_key_purpose(cert_list[0], purpose, 0);
    if (ret != 1) {
      gnutls_assert();
      *voutput |=
          GNUTLS_CERT_PURPOSE_MISMATCH | GNUTLS_CERT_INVALID;
    }
  }

  if (hostname) {
    ret =
        gnutls_x509_crt_check_hostname2(cert_list[0], hostname,
                flags);
    if (ret == 0) {
      gnutls_assert();
      *voutput |=
          GNUTLS_CERT_UNEXPECTED_OWNER | GNUTLS_CERT_INVALID;
    }
  }

  if (ip.data) {
    ret =
        gnutls_x509_crt_check_ip(cert_list[0], ip.data, ip.size,
               flags);
    if (ret == 0) {
      gnutls_assert();
      *voutput |=
          GNUTLS_CERT_UNEXPECTED_OWNER | GNUTLS_CERT_INVALID;
    }
  }

  if (email) {
    ret = gnutls_x509_crt_check_email(cert_list[0], email, 0);
    if (ret == 0) {
      gnutls_assert();
      *voutput |=
          GNUTLS_CERT_UNEXPECTED_OWNER | GNUTLS_CERT_INVALID;
    }
  }

  /* CRL checks follow */

  if (*voutput != 0 || (flags & GNUTLS_VERIFY_DISABLE_CRL_CHECKS)) {
    ret = 0;
    goto cleanup;
  }

  /* Check revocation of individual certificates.
   * start with the last one that we already have its hash
   */
  ret =
      _gnutls_x509_crt_check_revocation(cert_list
                [cert_list_size - 1],
                list->node[hash].crls,
                list->node[hash].crl_size, func);
  if (ret == 1) {   /* revoked */
    *voutput |= GNUTLS_CERT_REVOKED;
    *voutput |= GNUTLS_CERT_INVALID;
    ret = 0;
    goto cleanup;
  }

  for (i = 0; i < cert_list_size - 1; i++) {
    hash =
        hash_pjw_bare(cert_list[i]->raw_issuer_dn.data,
          cert_list[i]->raw_issuer_dn.size);
    hash %= list->size;

    ret = _gnutls_x509_crt_check_revocation(cert_list[i],
              list->node[hash].crls,
              list->node[hash].
              crl_size, func);
    if (ret < 0) {
      gnutls_assert();
    } else if (ret == 1) { /* revoked */
      *voutput |= GNUTLS_CERT_REVOKED;
      *voutput |= GNUTLS_CERT_INVALID;
      ret = 0;
      goto cleanup;
    }
  }

 cleanup:
  for (i = 0; i < retrieved_size; i++) {
    gnutls_x509_crt_deinit(retrieved[i]);
  }
  gl_list_free(records);
  return ret;
}

/**
 * gnutls_x509_trust_list_verify_named_crt:
 * @list: The list
 * @cert: is the certificate to be verified
 * @name: is the certificate's name
 * @name_size: is the certificate's name size
 * @flags: Flags that may be used to change the verification algorithm. Use OR of the gnutls_certificate_verify_flags enumerations.
 * @voutput: will hold the certificate verification output.
 * @func: If non-null will be called on each chain element verification with the output.
 *
 * This function will try to find a certificate that is associated with the provided
 * name --see gnutls_x509_trust_list_add_named_crt(). If a match is found the
 * certificate is considered valid. In addition to that this function will also 
 * check CRLs. The @voutput parameter will hold an OR'ed sequence of 
 * %gnutls_certificate_status_t flags.
 *
 * Additionally a certificate verification profile can be specified
 * from the ones in %gnutls_certificate_verification_profiles_t by
 * ORing the result of GNUTLS_PROFILE_TO_VFLAGS() to the verification
 * flags.
 *
 * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise a
 *   negative error value.
 *
 * Since: 3.0.0
 **/
int
gnutls_x509_trust_list_verify_named_crt(gnutls_x509_trust_list_t list,
          gnutls_x509_crt_t cert,
          const void *name,
          size_t name_size,
          unsigned int flags,
          unsigned int *voutput,
          gnutls_verify_output_function func)
{
  int ret;
  unsigned int i;
  size_t hash;

  hash =
      hash_pjw_bare(cert->raw_issuer_dn.data, cert->raw_issuer_dn.size);
  hash %= list->size;

  ret = check_if_in_blocklist(&cert, 1,
            list->distrusted, list->distrusted_size);
  if (ret != 0) {
    *voutput = 0;
    *voutput |= GNUTLS_CERT_REVOKED;
    *voutput |= GNUTLS_CERT_INVALID;
    return 0;
  }

  *voutput = GNUTLS_CERT_INVALID | GNUTLS_CERT_SIGNER_NOT_FOUND;

  for (i = 0; i < list->node[hash].named_cert_size; i++) {
    if (gnutls_x509_crt_equals(cert, list->node[hash].named_certs[i].cert) != 0) { /* check if name matches */
      if (list->node[hash].named_certs[i].name_size ==
          name_size
          && memcmp(list->node[hash].named_certs[i].name,
              name, name_size) == 0) {
        *voutput = 0;
        break;
      }
    }
  }

  if (*voutput != 0 || (flags & GNUTLS_VERIFY_DISABLE_CRL_CHECKS))
    return 0;

  /* Check revocation of individual certificates.
   * start with the last one that we already have its hash
   */
  ret = _gnutls_x509_crt_check_revocation(cert,
            list->node[hash].crls,
            list->node[hash].crl_size,
            func);
  if (ret == 1) {   /* revoked */
    *voutput |= GNUTLS_CERT_REVOKED;
    *voutput |= GNUTLS_CERT_INVALID;
    return 0;
  }

  return 0;
}

/* return 1 if @cert is in @list, 0 if not */
int
_gnutls_trustlist_inlist(gnutls_x509_trust_list_t list, gnutls_x509_crt_t cert)
{
  int ret;
  unsigned int i;
  size_t hash;

  hash = hash_pjw_bare(cert->raw_dn.data, cert->raw_dn.size);
  hash %= list->size;

  for (i = 0; i < list->node[hash].trusted_ca_size; i++) {
    ret =
        gnutls_x509_crt_equals(cert,
             list->node[hash].trusted_cas[i]);
    if (ret != 0)
      return 1;
  }

  return 0;
}

Coverage Report

Created: 2023-03-26 07:33