/src/gnutls/lib/x509/output.c

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/*
 * Copyright (C) 2007-2016 Free Software Foundation, Inc.
 * Copyright (C) 2015-2017 Red Hat, Inc.
 *
 * Author: Simon Josefsson, 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/>
 *
 */

/* Functions for printing X.509 Certificate structures
 */

#include "gnutls_int.h"
#include <common.h>
#include <x509.h>
#include <x509_int.h>
#include <num.h>
#include "errors.h"
#include "hello_ext.h"
#include "ip.h"

#define addf _gnutls_buffer_append_printf
#define adds _gnutls_buffer_append_str

#define NON_NULL(x) (((x)!=NULL)?((char*)(x)):"")
#define ERROR_STR (char*) "(error)"

static void print_idn_name(gnutls_buffer_st * str, const char *prefix,
         const char *type, gnutls_datum_t * name)
{
  unsigned printable = 1;
  unsigned is_printed = 0;
  gnutls_datum_t out = { NULL, 0 };
  int ret;

  if (!_gnutls_str_is_print((char *)name->data, name->size))
    printable = 0;

  is_printed = 0;
  if (!printable) {
    addf(str, _("%s%s: %.*s (contains illegal chars)\n"), prefix,
         type, name->size, NON_NULL(name->data));
    is_printed = 1;
  } else if (name->data != NULL) {
    if (strstr((char *)name->data, "xn--") != NULL) {
      ret =
          gnutls_idna_reverse_map((char *)name->data,
                name->size, &out, 0);
      if (ret >= 0) {
        addf(str, _("%s%s: %.*s (%s)\n"), prefix, type,
             name->size, NON_NULL(name->data),
             out.data);
        is_printed = 1;
        gnutls_free(out.data);
      }
    }
  }

  if (is_printed == 0) {
    addf(str, _("%s%s: %.*s\n"), prefix, type, name->size,
         NON_NULL(name->data));
  }
}

static void print_idn_email(gnutls_buffer_st * str, const char *prefix,
          const char *type, gnutls_datum_t * name)
{
  unsigned printable = 1;
  unsigned is_printed = 0;
  gnutls_datum_t out = { NULL, 0 };
  int ret;

  if (!_gnutls_str_is_print((char *)name->data, name->size))
    printable = 0;

  is_printed = 0;
  if (!printable) {
    addf(str, _("%s%s: %.*s (contains illegal chars)\n"), prefix,
         type, name->size, NON_NULL(name->data));
    is_printed = 1;
  } else if (name->data != NULL) {
    if (strstr((char *)name->data, "xn--") != NULL) {
      ret =
          _gnutls_idna_email_reverse_map((char *)name->data,
                 name->size, &out);
      if (ret >= 0) {
        addf(str, _("%s%s: %.*s (%s)\n"), prefix, type,
             name->size, NON_NULL(name->data),
             out.data);
        is_printed = 1;
        gnutls_free(out.data);
      }
    }
  }

  if (is_printed == 0) {
    addf(str, _("%s%s: %.*s\n"), prefix, type, name->size,
         NON_NULL(name->data));
  }
}

static void
print_name(gnutls_buffer_st * str, const char *prefix, unsigned type,
     gnutls_datum_t * name, unsigned ip_is_cidr)
{
  char *sname = (char *)name->data;
  char str_ip[64];
  const char *p;

  if ((type == GNUTLS_SAN_DNSNAME || type == GNUTLS_SAN_OTHERNAME_XMPP
       || type == GNUTLS_SAN_OTHERNAME_KRB5PRINCIPAL
       || type == GNUTLS_SAN_OTHERNAME_MSUSERPRINCIPAL
       || type == GNUTLS_SAN_RFC822NAME
       || type == GNUTLS_SAN_URI) && sname != NULL
      && strlen(sname) != name->size) {
    adds(str,
         _("warning: SAN contains an embedded NUL, "
           "replacing with '!'\n"));
    while (strlen(sname) < name->size)
      name->data[strlen(sname)] = '!';
  }

  switch (type) {
  case GNUTLS_SAN_DNSNAME:
    print_idn_name(str, prefix, "DNSname", name);
    break;

  case GNUTLS_SAN_RFC822NAME:
    print_idn_email(str, prefix, "RFC822Name", name);
    break;

  case GNUTLS_SAN_URI:
    addf(str, _("%sURI: %.*s\n"), prefix, name->size,
         NON_NULL(name->data));
    break;

  case GNUTLS_SAN_IPADDRESS:
    if (!ip_is_cidr)
      p = _gnutls_ip_to_string(name->data, name->size, str_ip,
             sizeof(str_ip));
    else
      p = _gnutls_cidr_to_string(name->data, name->size,
               str_ip, sizeof(str_ip));
    if (p == NULL)
      p = ERROR_STR;
    addf(str, "%sIPAddress: %s\n", prefix, p);
    break;

  case GNUTLS_SAN_DN:
    addf(str, _("%sdirectoryName: %.*s\n"), prefix, name->size,
         NON_NULL(name->data));
    break;

  case GNUTLS_SAN_REGISTERED_ID:
    addf(str, _("%sRegistered ID: %.*s\n"), prefix, name->size,
         NON_NULL(name->data));
    break;

  case GNUTLS_SAN_OTHERNAME_XMPP:
    addf(str, _("%sXMPP Address: %.*s\n"), prefix, name->size,
         NON_NULL(name->data));
    break;

  case GNUTLS_SAN_OTHERNAME_KRB5PRINCIPAL:
    addf(str, _("%sKRB5Principal: %.*s\n"), prefix, name->size,
         NON_NULL(name->data));
    break;

  case GNUTLS_SAN_OTHERNAME_MSUSERPRINCIPAL:
    addf(str, _("%sUser Principal Name: %.*s\n"), prefix,
         name->size, NON_NULL(name->data));
    break;

  default:
    addf(str, _("%sUnknown name: "), prefix);
    _gnutls_buffer_hexprint(str, name->data, name->size);
    adds(str, "\n");
    break;
  }
}

static char *get_pk_name(gnutls_x509_crt_t cert, unsigned *bits)
{
  char oid[MAX_OID_SIZE];
  size_t oid_size;
  oid_size = sizeof(oid);
  int ret;

  ret = gnutls_x509_crt_get_pk_algorithm(cert, bits);
  if (ret > 0) {
    const char *name = gnutls_pk_algorithm_get_name(ret);

    if (name != NULL)
      return gnutls_strdup(name);
  }

  ret = gnutls_x509_crt_get_pk_oid(cert, oid, &oid_size);
  if (ret < 0)
    return NULL;

  return gnutls_strdup(oid);
}

static char *crq_get_pk_name(gnutls_x509_crq_t crq)
{
  char oid[MAX_OID_SIZE];
  size_t oid_size;
  oid_size = sizeof(oid);
  int ret;

  ret = gnutls_x509_crq_get_pk_algorithm(crq, NULL);
  if (ret > 0) {
    const char *name = gnutls_pk_algorithm_get_name(ret);

    if (name != NULL)
      return gnutls_strdup(name);
  }

  ret = gnutls_x509_crq_get_pk_oid(crq, oid, &oid_size);
  if (ret < 0)
    return NULL;

  return gnutls_strdup(oid);
}

static char *get_sign_name(gnutls_x509_crt_t cert, int *algo)
{
  char oid[MAX_OID_SIZE];
  size_t oid_size;
  oid_size = sizeof(oid);
  int ret;

  *algo = 0;

  ret = gnutls_x509_crt_get_signature_algorithm(cert);
  if (ret > 0) {
    const char *name = gnutls_sign_get_name(ret);

    *algo = ret;

    if (name != NULL)
      return gnutls_strdup(name);
  }

  ret = gnutls_x509_crt_get_signature_oid(cert, oid, &oid_size);
  if (ret < 0)
    return NULL;

  return gnutls_strdup(oid);
}

static char *crq_get_sign_name(gnutls_x509_crq_t crq)
{
  char oid[MAX_OID_SIZE];
  size_t oid_size;
  oid_size = sizeof(oid);
  int ret;

  ret = gnutls_x509_crq_get_signature_algorithm(crq);
  if (ret > 0) {
    const char *name = gnutls_sign_get_name(ret);

    if (name != NULL)
      return gnutls_strdup(name);
  }

  ret = gnutls_x509_crq_get_signature_oid(crq, oid, &oid_size);
  if (ret < 0)
    return NULL;

  return gnutls_strdup(oid);
}

static char *crl_get_sign_name(gnutls_x509_crl_t crl, int *algo)
{
  char oid[MAX_OID_SIZE];
  size_t oid_size;
  oid_size = sizeof(oid);
  int ret;

  *algo = 0;

  ret = gnutls_x509_crl_get_signature_algorithm(crl);
  if (ret > 0) {
    const char *name = gnutls_sign_get_name(ret);

    *algo = ret;

    if (name != NULL)
      return gnutls_strdup(name);
  }

  ret = gnutls_x509_crl_get_signature_oid(crl, oid, &oid_size);
  if (ret < 0)
    return NULL;

  return gnutls_strdup(oid);
}

static void print_proxy(gnutls_buffer_st * str, gnutls_datum_t * der)
{
  int pathlen;
  char *policyLanguage;
  char *policy;
  size_t npolicy;
  int err;

  err = gnutls_x509_ext_import_proxy(der, &pathlen, &policyLanguage,
             &policy, &npolicy);
  if (err < 0) {
    addf(str, "error: get_proxy: %s\n", gnutls_strerror(err));
    return;
  }

  if (pathlen >= 0)
    addf(str, _("\t\t\tPath Length Constraint: %d\n"), pathlen);
  addf(str, _("\t\t\tPolicy Language: %s"), policyLanguage);
  if (strcmp(policyLanguage, "1.3.6.1.5.5.7.21.1") == 0)
    adds(str, " (id-ppl-inheritALL)\n");
  else if (strcmp(policyLanguage, "1.3.6.1.5.5.7.21.2") == 0)
    adds(str, " (id-ppl-independent)\n");
  else
    adds(str, "\n");
  if (npolicy) {
    adds(str, _("\t\t\tPolicy:\n\t\t\t\tASCII: "));
    _gnutls_buffer_asciiprint(str, policy, npolicy);
    adds(str, _("\n\t\t\t\tHexdump: "));
    _gnutls_buffer_hexprint(str, policy, npolicy);
    adds(str, "\n");
  }
  gnutls_free(policy);
  gnutls_free(policyLanguage);
}

static void print_nc(gnutls_buffer_st * str, const char *prefix,
         gnutls_datum_t * der)
{
  gnutls_x509_name_constraints_t nc;
  int ret;
  unsigned idx = 0;
  gnutls_datum_t name;
  unsigned type;
  char new_prefix[16];

  ret = gnutls_x509_name_constraints_init(&nc);
  if (ret < 0)
    return;

  ret = gnutls_x509_ext_import_name_constraints(der, nc, 0);
  if (ret < 0)
    goto cleanup;

  snprintf(new_prefix, sizeof(new_prefix), "%s\t\t\t\t", prefix);

  do {
    ret =
        gnutls_x509_name_constraints_get_permitted(nc, idx++, &type,
                     &name);

    if (ret >= 0) {
      if (idx == 1)
        addf(str, _("%s\t\t\tPermitted:\n"), prefix);

      print_name(str, new_prefix, type, &name, 1);
    }
  } while (ret == 0);

  idx = 0;
  do {
    ret =
        gnutls_x509_name_constraints_get_excluded(nc, idx++, &type,
                    &name);

    if (ret >= 0) {
      if (idx == 1)
        addf(str, _("%s\t\t\tExcluded:\n"), prefix);

      print_name(str, new_prefix, type, &name, 1);
    }
  } while (ret == 0);

 cleanup:
  gnutls_x509_name_constraints_deinit(nc);
}

static void print_aia(gnutls_buffer_st * str, const gnutls_datum_t * der)
{
  int err;
  int seq;
  gnutls_datum_t san = { NULL, 0 }, oid = { NULL, 0 };
  gnutls_x509_aia_t aia;
  unsigned int san_type;

  err = gnutls_x509_aia_init(&aia);
  if (err < 0)
    return;

  err = gnutls_x509_ext_import_aia(der, aia, 0);
  if (err < 0) {
    addf(str, "error: get_aia: %s\n", gnutls_strerror(err));
    goto cleanup;
  }

  for (seq = 0;; seq++) {
    err = gnutls_x509_aia_get(aia, seq, &oid, &san_type, &san);
    if (err == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
      goto cleanup;
    if (err < 0) {
      addf(str, "error: aia_get: %s\n", gnutls_strerror(err));
      goto cleanup;
    }

    if (strcmp((char *)oid.data, GNUTLS_OID_AD_OCSP) == 0)
      addf(str, _("\t\t\tAccess Method: %s (%s)\n"),
           GNUTLS_OID_AD_OCSP, "id-ad-ocsp");
    else if (strcmp((char *)oid.data, GNUTLS_OID_AD_CAISSUERS) == 0)
      addf(str, _("\t\t\tAccess Method: %s (%s)\n"),
           GNUTLS_OID_AD_CAISSUERS, "id-ad-caIssuers");
    else {
      addf(str, _("\t\t\tAccess Method: %s (%s)\n"),
           (char *)oid.data, "UNKNOWN");
    }

    adds(str, "\t\t\tAccess Location ");
    print_name(str, "", san_type, &san, 0);
  }

 cleanup:
  gnutls_x509_aia_deinit(aia);
}

static void print_ski(gnutls_buffer_st * str, gnutls_datum_t * der)
{
  gnutls_datum_t id = { NULL, 0 };
  int err;

  err = gnutls_x509_ext_import_subject_key_id(der, &id);
  if (err < 0) {
    addf(str, "error: get_subject_key_id: %s\n",
         gnutls_strerror(err));
    return;
  }

  adds(str, "\t\t\t");
  _gnutls_buffer_hexprint(str, id.data, id.size);
  adds(str, "\n");

  gnutls_free(id.data);
}

static void print_time(gnutls_buffer_st * str, time_t timestamp)
{
  char s[42];
  size_t max = sizeof(s);
  struct tm t;

  if (gmtime_r(&timestamp, &t) == NULL) {
    addf(str, "error: gmtime_r (%lu)\n", timestamp);
    return;
  }

  if (strftime(s, max, "%a, %b %d %H:%M:%S UTC %Y", &t) == 0)
    addf(str, "error: strftime (%lu)\n", timestamp);
  else
    addf(str, "%s\n", s);
}

static void print_scts(gnutls_buffer_st * str, const gnutls_datum_t * der,
           const char *prefix)
{
  int retval;
  unsigned int version;
  time_t timestamp;
  gnutls_datum_t logid = { NULL, 0 }, sig = { NULL, 0 };
  gnutls_sign_algorithm_t sigalg;
  gnutls_x509_ct_scts_t scts;

  retval = gnutls_x509_ext_ct_scts_init(&scts);
  if (retval < 0) {
    addf(str, "error: gnutls_x509_ext_ct_scts_init(): %s\n",
         gnutls_strerror(retval));
    return;
  }

  retval = gnutls_x509_ext_ct_import_scts(der, scts, 0);
  if (retval < 0) {
    addf(str, "error: gnutls_x509_ext_ct_import_scts(): %s\n",
         gnutls_strerror(retval));
    goto cleanup;
  }

  for (int i = 0;; i++) {
    retval = gnutls_x509_ct_sct_get_version(scts, i, &version);
    if (retval == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
      break;

    addf(str, _("%s\t\t\tSigned Certificate Timestamp %d:\n"),
         prefix, (i + 1));

    if (version != 1) {
      addf(str,
           _("%s\t\t\t\tVersion: %d (unknown SCT version)\n"),
           prefix, version);
      continue;
    }

    retval = gnutls_x509_ct_sct_get(scts, i,
            &timestamp,
            &logid, &sigalg, &sig);
    if (retval < 0) {
      addf(str, "error: could not get SCT info: %s\n",
           gnutls_strerror(retval));
      break;
    }

    addf(str, _("%s\t\t\t\tVersion: %d\n"), prefix, version);
    addf(str, _("%s\t\t\t\tLog ID: "), prefix);
    _gnutls_buffer_hexprint(str, logid.data, logid.size);
    addf(str, "\n");
    addf(str, _("%s\t\t\t\tTime: "), prefix);
    print_time(str, timestamp);
    addf(str, _("%s\t\t\t\tExtensions: none\n"), /* there are no extensions defined for v1 */
         prefix);
    addf(str, _("%s\t\t\t\tSignature algorithm: %s\n"),
         prefix, gnutls_sign_get_name(sigalg));
    addf(str, _("%s\t\t\t\tSignature: "), prefix);
    _gnutls_buffer_hexprint(str, sig.data, sig.size);
    addf(str, "\n");

    _gnutls_free_datum(&sig);
    _gnutls_free_datum(&logid);
    sig.data = NULL;
    logid.data = NULL;
  }

 cleanup:
  _gnutls_free_datum(&sig);
  _gnutls_free_datum(&logid);
  gnutls_x509_ext_ct_scts_deinit(scts);
}

#define TYPE_CRT 2
#define TYPE_CRQ 3

typedef union {
  gnutls_x509_crt_t crt;
  gnutls_x509_crq_t crq;
} cert_type_t;

static void print_aki_gn_serial(gnutls_buffer_st * str, gnutls_x509_aki_t aki)
{
  gnutls_datum_t san, other_oid, serial;
  unsigned int alt_type;
  int err;

  err =
      gnutls_x509_aki_get_cert_issuer(aki,
              0, &alt_type, &san, &other_oid,
              &serial);
  if (err == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
    return;
  } else if (err < 0) {
    addf(str, "error: gnutls_x509_aki_get_cert_issuer: %s\n",
         gnutls_strerror(err));
    return;
  }

  print_name(str, "\t\t\t", alt_type, &san, 0);

  adds(str, "\t\t\tserial: ");
  _gnutls_buffer_hexprint(str, serial.data, serial.size);
  adds(str, "\n");
}

static void print_aki(gnutls_buffer_st * str, gnutls_datum_t * der)
{
  int err;
  gnutls_x509_aki_t aki;
  gnutls_datum_t id;

  err = gnutls_x509_aki_init(&aki);
  if (err < 0) {
    addf(str, "error: gnutls_x509_aki_init: %s\n",
         gnutls_strerror(err));
    return;
  }

  err = gnutls_x509_ext_import_authority_key_id(der, aki, 0);
  if (err < 0) {
    addf(str,
         "error: gnutls_x509_ext_import_authority_key_id: %s\n",
         gnutls_strerror(err));
    goto cleanup;
  }

  /* Check if an alternative name is there */
  print_aki_gn_serial(str, aki);

  err = gnutls_x509_aki_get_id(aki, &id);
  if (err == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
    goto cleanup;
  } else if (err < 0) {
    addf(str, "error: gnutls_x509_aki_get_id: %s\n",
         gnutls_strerror(err));
    goto cleanup;
  }

  adds(str, "\t\t\t");
  _gnutls_buffer_hexprint(str, id.data, id.size);
  adds(str, "\n");

 cleanup:
  gnutls_x509_aki_deinit(aki);
}

static void
print_key_usage2(gnutls_buffer_st * str, const char *prefix,
     unsigned int key_usage)
{
  if (key_usage & GNUTLS_KEY_DIGITAL_SIGNATURE)
    addf(str, _("%sDigital signature.\n"), prefix);
  if (key_usage & GNUTLS_KEY_NON_REPUDIATION)
    addf(str, _("%sNon repudiation.\n"), prefix);
  if (key_usage & GNUTLS_KEY_KEY_ENCIPHERMENT)
    addf(str, _("%sKey encipherment.\n"), prefix);
  if (key_usage & GNUTLS_KEY_DATA_ENCIPHERMENT)
    addf(str, _("%sData encipherment.\n"), prefix);
  if (key_usage & GNUTLS_KEY_KEY_AGREEMENT)
    addf(str, _("%sKey agreement.\n"), prefix);
  if (key_usage & GNUTLS_KEY_KEY_CERT_SIGN)
    addf(str, _("%sCertificate signing.\n"), prefix);
  if (key_usage & GNUTLS_KEY_CRL_SIGN)
    addf(str, _("%sCRL signing.\n"), prefix);
  if (key_usage & GNUTLS_KEY_ENCIPHER_ONLY)
    addf(str, _("%sKey encipher only.\n"), prefix);
  if (key_usage & GNUTLS_KEY_DECIPHER_ONLY)
    addf(str, _("%sKey decipher only.\n"), prefix);
}

static void
print_key_usage(gnutls_buffer_st * str, const char *prefix,
    gnutls_datum_t * der)
{
  unsigned int key_usage;
  int err;

  err = gnutls_x509_ext_import_key_usage(der, &key_usage);
  if (err < 0) {
    addf(str, "error: get_key_usage: %s\n", gnutls_strerror(err));
    return;
  }

  print_key_usage2(str, prefix, key_usage);
}

static void
print_private_key_usage_period(gnutls_buffer_st * str, const char *prefix,
             gnutls_datum_t * der)
{
  time_t activation, expiration;
  int err;
  char s[42];
  struct tm t;
  size_t max;

  err =
      gnutls_x509_ext_import_private_key_usage_period(der, &activation,
                  &expiration);
  if (err < 0) {
    addf(str, "error: get_private_key_usage_period: %s\n",
         gnutls_strerror(err));
    return;
  }

  max = sizeof(s);

  if (gmtime_r(&activation, &t) == NULL)
    addf(str, "error: gmtime_r (%ld)\n", (unsigned long)activation);
  else if (strftime(s, max, "%a %b %d %H:%M:%S UTC %Y", &t) == 0)
    addf(str, "error: strftime (%ld)\n", (unsigned long)activation);
  else
    addf(str, _("\t\t\tNot Before: %s\n"), s);

  if (gmtime_r(&expiration, &t) == NULL)
    addf(str, "error: gmtime_r (%ld)\n", (unsigned long)expiration);
  else if (strftime(s, max, "%a %b %d %H:%M:%S UTC %Y", &t) == 0)
    addf(str, "error: strftime (%ld)\n", (unsigned long)expiration);
  else
    addf(str, _("\t\t\tNot After: %s\n"), s);

}

static void print_crldist(gnutls_buffer_st * str, gnutls_datum_t * der)
{
  int err;
  int indx;
  gnutls_x509_crl_dist_points_t dp;
  unsigned int flags, type;
  gnutls_datum_t dist;

  err = gnutls_x509_crl_dist_points_init(&dp);
  if (err < 0) {
    addf(str, "error: gnutls_x509_crl_dist_points_init: %s\n",
         gnutls_strerror(err));
    return;
  }

  err = gnutls_x509_ext_import_crl_dist_points(der, dp, 0);
  if (err < 0) {
    addf(str, "error: gnutls_x509_ext_import_crl_dist_points: %s\n",
         gnutls_strerror(err));
    goto cleanup;
  }

  for (indx = 0;; indx++) {
    err =
        gnutls_x509_crl_dist_points_get(dp, indx, &type, &dist,
                &flags);
    if (err == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
      goto cleanup;
    else if (err < 0) {
      addf(str, "error: get_crl_dist_points: %s\n",
           gnutls_strerror(err));
      return;
    }

    print_name(str, "\t\t\t", type, &dist, 0);
  }
 cleanup:
  gnutls_x509_crl_dist_points_deinit(dp);
}

static void
print_key_purpose(gnutls_buffer_st * str, const char *prefix,
      gnutls_datum_t * der)
{
  int indx;
  gnutls_datum_t oid;
  char *p;
  int err;
  gnutls_x509_key_purposes_t purposes;

  err = gnutls_x509_key_purpose_init(&purposes);
  if (err < 0) {
    addf(str, "error: gnutls_x509_key_purpose_init: %s\n",
         gnutls_strerror(err));
    return;
  }

  err = gnutls_x509_ext_import_key_purposes(der, purposes, 0);
  if (err < 0) {
    addf(str, "error: gnutls_x509_ext_import_key_purposes: %s\n",
         gnutls_strerror(err));
    goto cleanup;
  }

  for (indx = 0;; indx++) {
    err = gnutls_x509_key_purpose_get(purposes, indx, &oid);
    if (err == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
      goto cleanup;
    else if (err < 0) {
      addf(str, "error: gnutls_x509_key_purpose_get: %s\n",
           gnutls_strerror(err));
      goto cleanup;
    }

    p = (void *)oid.data;
    if (strcmp(p, GNUTLS_KP_TLS_WWW_SERVER) == 0)
      addf(str, _("%s\t\t\tTLS WWW Server.\n"), prefix);
    else if (strcmp(p, GNUTLS_KP_TLS_WWW_CLIENT) == 0)
      addf(str, _("%s\t\t\tTLS WWW Client.\n"), prefix);
    else if (strcmp(p, GNUTLS_KP_CODE_SIGNING) == 0)
      addf(str, _("%s\t\t\tCode signing.\n"), prefix);
    else if (strcmp(p, GNUTLS_KP_EMAIL_PROTECTION) == 0)
      addf(str, _("%s\t\t\tEmail protection.\n"), prefix);
    else if (strcmp(p, GNUTLS_KP_TIME_STAMPING) == 0)
      addf(str, _("%s\t\t\tTime stamping.\n"), prefix);
    else if (strcmp(p, GNUTLS_KP_OCSP_SIGNING) == 0)
      addf(str, _("%s\t\t\tOCSP signing.\n"), prefix);
    else if (strcmp(p, GNUTLS_KP_IPSEC_IKE) == 0)
      addf(str, _("%s\t\t\tIpsec IKE.\n"), prefix);
    else if (strcmp(p, GNUTLS_KP_MS_SMART_CARD_LOGON) == 0)
      addf(str, _("%s\t\t\tSmart Card Logon.\n"), prefix);
    else if (strcmp(p, GNUTLS_KP_ANY) == 0)
      addf(str, _("%s\t\t\tAny purpose.\n"), prefix);
    else
      addf(str, "%s\t\t\t%s\n", prefix, p);
  }
 cleanup:
  gnutls_x509_key_purpose_deinit(purposes);
}

static void
print_basic(gnutls_buffer_st * str, const char *prefix, gnutls_datum_t * der)
{
  int pathlen;
  unsigned ca;
  int err;

  err = gnutls_x509_ext_import_basic_constraints(der, &ca, &pathlen);
  if (err < 0) {
    addf(str, "error: get_basic_constraints: %s\n",
         gnutls_strerror(err));
    return;
  }

  if (ca == 0)
    addf(str, _("%s\t\t\tCertificate Authority (CA): FALSE\n"),
         prefix);
  else
    addf(str, _("%s\t\t\tCertificate Authority (CA): TRUE\n"),
         prefix);

  if (pathlen >= 0)
    addf(str, _("%s\t\t\tPath Length Constraint: %d\n"),
         prefix, pathlen);
}

static void
print_altname(gnutls_buffer_st * str, const char *prefix, gnutls_datum_t * der)
{
  unsigned int altname_idx;
  gnutls_subject_alt_names_t names;
  unsigned int type;
  gnutls_datum_t san;
  gnutls_datum_t othername;
  char pfx[16];
  int err;

  err = gnutls_subject_alt_names_init(&names);
  if (err < 0) {
    addf(str, "error: gnutls_subject_alt_names_init: %s\n",
         gnutls_strerror(err));
    return;
  }

  err = gnutls_x509_ext_import_subject_alt_names(der, names, 0);
  if (err < 0) {
    addf(str,
         "error: gnutls_x509_ext_import_subject_alt_names: %s\n",
         gnutls_strerror(err));
    goto cleanup;
  }

  for (altname_idx = 0;; altname_idx++) {
    err = gnutls_subject_alt_names_get(names, altname_idx,
               &type, &san, &othername);
    if (err == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
      break;
    else if (err < 0) {
      addf(str,
           "error: gnutls_subject_alt_names_get: %s\n",
           gnutls_strerror(err));
      break;
    }

    if (type == GNUTLS_SAN_OTHERNAME) {
      unsigned vtype;
      gnutls_datum_t virt;

      err = gnutls_x509_othername_to_virtual((char *)
                     othername.data,
                     &san, &vtype,
                     &virt);
      if (err >= 0) {
        snprintf(pfx, sizeof(pfx), "%s\t\t\t", prefix);
        print_name(str, pfx, vtype, &virt, 0);
        gnutls_free(virt.data);
        continue;
      }

      addf(str,
           _("%s\t\t\totherName OID: %.*s\n"),
           prefix, (int)othername.size,
           (char *)othername.data);
      addf(str, _("%s\t\t\totherName DER: "), prefix);
      _gnutls_buffer_hexprint(str, san.data, san.size);
      addf(str, _("\n%s\t\t\totherName ASCII: "), prefix);
      _gnutls_buffer_asciiprint(str, (char *)san.data,
              san.size);
      addf(str, "\n");
    } else {

      snprintf(pfx, sizeof(pfx), "%s\t\t\t", prefix);
      print_name(str, pfx, type, &san, 0);
    }
  }

 cleanup:
  gnutls_subject_alt_names_deinit(names);
}

static void
guiddump(gnutls_buffer_st * str, const char *data, size_t len, const char *spc)
{
  size_t j;

  if (spc)
    adds(str, spc);
  addf(str, "{");
  addf(str, "%.2X", (unsigned char)data[3]);
  addf(str, "%.2X", (unsigned char)data[2]);
  addf(str, "%.2X", (unsigned char)data[1]);
  addf(str, "%.2X", (unsigned char)data[0]);
  addf(str, "-");
  addf(str, "%.2X", (unsigned char)data[5]);
  addf(str, "%.2X", (unsigned char)data[4]);
  addf(str, "-");
  addf(str, "%.2X", (unsigned char)data[7]);
  addf(str, "%.2X", (unsigned char)data[6]);
  addf(str, "-");
  addf(str, "%.2X", (unsigned char)data[8]);
  addf(str, "%.2X", (unsigned char)data[9]);
  addf(str, "-");
  for (j = 10; j < 16; j++) {
    addf(str, "%.2X", (unsigned char)data[j]);
  }
  addf(str, "}\n");
}

static void
print_unique_ids(gnutls_buffer_st * str, const gnutls_x509_crt_t cert)
{
  int result;
  char buf[256];    /* if its longer, we won't bother to print it */
  size_t buf_size = 256;

  result = gnutls_x509_crt_get_issuer_unique_id(cert, buf, &buf_size);
  if (result >= 0) {
    addf(str, ("\tIssuer Unique ID:\n"));
    _gnutls_buffer_hexdump(str, buf, buf_size, "\t\t\t");
    if (buf_size == 16) { /* this could be a GUID */
      guiddump(str, buf, buf_size, "\t\t\t");
    }
  }

  buf_size = 256;
  result = gnutls_x509_crt_get_subject_unique_id(cert, buf, &buf_size);
  if (result >= 0) {
    addf(str, ("\tSubject Unique ID:\n"));
    _gnutls_buffer_hexdump(str, buf, buf_size, "\t\t\t");
    if (buf_size == 16) { /* this could be a GUID */
      guiddump(str, buf, buf_size, "\t\t\t");
    }
  }
}

static void print_tlsfeatures(gnutls_buffer_st * str, const char *prefix,
            const gnutls_datum_t * der)
{
  int err;
  int seq;
  gnutls_x509_tlsfeatures_t features;
  const char *name;
  unsigned int feature;

  err = gnutls_x509_tlsfeatures_init(&features);
  if (err < 0)
    return;

  err = gnutls_x509_ext_import_tlsfeatures(der, features, 0);
  if (err < 0) {
    addf(str, "error: get_tlsfeatures: %s\n", gnutls_strerror(err));
    goto cleanup;
  }

  for (seq = 0;; seq++) {
    err = gnutls_x509_tlsfeatures_get(features, seq, &feature);
    if (err == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
      goto cleanup;
    if (err < 0) {
      addf(str, "error: get_tlsfeatures: %s\n",
           gnutls_strerror(err));
      goto cleanup;
    }

    name = gnutls_ext_get_name(feature);
    if (name == NULL)
      addf(str, "%s\t\t\t%u\n", prefix, feature);
    else
      addf(str, "%s\t\t\t%s(%u)\n", prefix, name, feature);
  }

 cleanup:
  gnutls_x509_tlsfeatures_deinit(features);
}

static void print_subject_sign_tool(gnutls_buffer_st * str, const char *prefix,
            const gnutls_datum_t * der)
{
  int ret;
  gnutls_datum_t tmp = { NULL, 0 };

  ret =
      _gnutls_x509_decode_string(ASN1_ETYPE_UTF8_STRING, der->data,
               der->size, &tmp, 0);
  if (ret < 0) {
    addf(str, _("%s\t\t\tASCII: "), prefix);
    _gnutls_buffer_asciiprint(str, (char *)der->data, der->size);

    addf(str, "\n");
    addf(str, _("%s\t\t\tHexdump: "), prefix);
    _gnutls_buffer_hexprint(str, (char *)der->data, der->size);
    adds(str, "\n");

    return;
  }

  addf(str, _("%s\t\t\t%.*s\n"), prefix, tmp.size, NON_NULL(tmp.data));
  _gnutls_free_datum(&tmp);
}

static void print_issuer_sign_tool(gnutls_buffer_st * str, const char *prefix,
           const gnutls_datum_t * der)
{
  int ret;
  asn1_node tmpasn = NULL;
  char asn1_err[ASN1_MAX_ERROR_DESCRIPTION_SIZE] = "";
  gnutls_datum_t tmp;

  if (asn1_create_element
      (_gnutls_get_gnutls_asn(), "GNUTLS.IssuerSignTool",
       &tmpasn) != ASN1_SUCCESS) {
    gnutls_assert();
    goto hexdump;
  }

  if (_asn1_strict_der_decode(&tmpasn, der->data, der->size, asn1_err) !=
      ASN1_SUCCESS) {
    gnutls_assert();
    _gnutls_debug_log("_asn1_strict_der_decode: %s\n", asn1_err);
    goto hexdump;
  }

  ret = _gnutls_x509_read_value(tmpasn, "signTool", &tmp);
  if (ret < 0) {
    gnutls_assert();
    goto hexdump;
  }
  addf(str, _("%s\t\t\tSignTool: %.*s\n"), prefix, tmp.size,
       NON_NULL(tmp.data));
  _gnutls_free_datum(&tmp);

  ret = _gnutls_x509_read_value(tmpasn, "cATool", &tmp);
  if (ret < 0) {
    gnutls_assert();
    goto hexdump;
  }
  addf(str, _("%s\t\t\tCATool: %.*s\n"), prefix, tmp.size,
       NON_NULL(tmp.data));
  _gnutls_free_datum(&tmp);

  ret = _gnutls_x509_read_value(tmpasn, "signToolCert", &tmp);
  if (ret < 0) {
    gnutls_assert();
    goto hexdump;
  }
  addf(str, _("%s\t\t\tSignToolCert: %.*s\n"), prefix, tmp.size,
       NON_NULL(tmp.data));
  _gnutls_free_datum(&tmp);

  ret = _gnutls_x509_read_value(tmpasn, "cAToolCert", &tmp);
  if (ret < 0) {
    gnutls_assert();
    goto hexdump;
  }
  addf(str, _("%s\t\t\tCAToolCert: %.*s\n"), prefix, tmp.size,
       NON_NULL(tmp.data));
  _gnutls_free_datum(&tmp);

  asn1_delete_structure(&tmpasn);

  return;

 hexdump:
  asn1_delete_structure(&tmpasn);

  addf(str, _("%s\t\t\tASCII: "), prefix);
  _gnutls_buffer_asciiprint(str, (char *)der->data, der->size);

  addf(str, "\n");
  addf(str, _("%s\t\t\tHexdump: "), prefix);
  _gnutls_buffer_hexprint(str, (char *)der->data, der->size);
  adds(str, "\n");
}

#define ENTRY(oid, name) {oid, sizeof(oid)-1, name, sizeof(name)-1, NULL, 0}

static const struct oid_to_string cp_oid2str[] = {
  ENTRY("2.5.29.32.0", "anyPolicy"),

  ENTRY("2.23.140.1.2.1", "CA/B Domain Validated"),
  ENTRY("2.23.140.1.2.2", "CA/B Organization Validated"),
  ENTRY("2.23.140.1.2.3", "CA/B Individual Validated"),
  ENTRY("2.23.140.1.1", "CA/B Extended Validation"),

  /* draft-deremin-rfc4491-bis */
  ENTRY("1.2.643.100.113.1", "Russian security class KC1"),
  ENTRY("1.2.643.100.113.2", "Russian security class KC2"),
  ENTRY("1.2.643.100.113.3", "Russian security class KC3"),
  ENTRY("1.2.643.100.113.4", "Russian security class KB1"),
  ENTRY("1.2.643.100.113.5", "Russian security class KB2"),
  ENTRY("1.2.643.100.113.6", "Russian security class KA1"),

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

struct ext_indexes_st {
  int san;
  int ian;
  int proxy;
  int basic;
  int keyusage;
  int keypurpose;
  int ski;
  int aki, nc;
  int crldist, pkey_usage_period;
  int tlsfeatures;
};

static void print_extension(gnutls_buffer_st * str, const char *prefix,
          struct ext_indexes_st *idx, const char *oid,
          unsigned critical, gnutls_datum_t * der)
{
  int err;
  unsigned j;
  char pfx[16];

  if (strcmp(oid, "2.5.29.19") == 0) {
    if (idx->basic) {
      addf(str, "warning: more than one basic constraint\n");
    }

    addf(str, _("%s\t\tBasic Constraints (%s):\n"),
         prefix, critical ? _("critical") : _("not critical"));

    print_basic(str, prefix, der);
    idx->basic++;

  } else if (strcmp(oid, "2.5.29.14") == 0) {
    if (idx->ski) {
      addf(str, "warning: more than one SKI extension\n");
    }

    addf(str,
         _("%s\t\tSubject Key Identifier (%s):\n"),
         prefix, critical ? _("critical") : _("not critical"));

    print_ski(str, der);

    idx->ski++;
  } else if (strcmp(oid, "2.5.29.32") == 0) {
    struct gnutls_x509_policy_st policy;
    gnutls_x509_policies_t policies;
    const char *name;
    const struct oid_to_string *entry;
    int x;

    err = gnutls_x509_policies_init(&policies);
    if (err < 0) {
      addf(str,
           "error: certificate policies: %s\n",
           gnutls_strerror(err));
      return;
    }

    err = gnutls_x509_ext_import_policies(der, policies, 0);
    if (err < 0) {
      addf(str,
           "error: certificate policies import: %s\n",
           gnutls_strerror(err));
      gnutls_x509_policies_deinit(policies);
      return;
    }

    for (x = 0;; x++) {
      err = gnutls_x509_policies_get(policies, x, &policy);
      if (err == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
        break;

      if (err < 0) {
        addf(str,
             "error: certificate policy: %s\n",
             gnutls_strerror(err));
        break;
      }

      if (x == 0)
        addf(str,
             "%s\t\tCertificate Policies (%s):\n",
             prefix,
             critical ? _("critical") :
             _("not critical"));

      entry = _gnutls_oid_get_entry(cp_oid2str, policy.oid);
      if (entry != NULL && entry->name_desc != NULL)
        addf(str, "%s\t\t\t%s (%s)\n", prefix,
             policy.oid, entry->name_desc);
      else
        addf(str, "%s\t\t\t%s\n", prefix, policy.oid);
      for (j = 0; j < policy.qualifiers; j++) {
        if (policy.qualifier[j].type ==
            GNUTLS_X509_QUALIFIER_URI)
          name = "URI";
        else if (policy.qualifier[j].type ==
           GNUTLS_X509_QUALIFIER_NOTICE)
          name = "Note";
        else
          name = "Unknown qualifier";
        addf(str, "%s\t\t\t\t%s: %s\n",
             prefix, name, policy.qualifier[j].data);
      }
    }
    gnutls_x509_policies_deinit(policies);
  } else if (strcmp(oid, "2.5.29.54") == 0) {
    unsigned int skipcerts;

    err = gnutls_x509_ext_import_inhibit_anypolicy(der, &skipcerts);
    if (err < 0) {
      addf(str,
           "error: certificate inhibit any policy import: %s\n",
           gnutls_strerror(err));
      return;
    }

    addf(str,
         "%s\t\tInhibit anyPolicy skip certs: %u (%s)\n",
         prefix, skipcerts,
         critical ? _("critical") : _("not critical"));

  } else if (strcmp(oid, "2.5.29.35") == 0) {

    if (idx->aki) {
      addf(str, "warning: more than one AKI extension\n");
    }

    addf(str,
         _("%s\t\tAuthority Key Identifier (%s):\n"),
         prefix, critical ? _("critical") : _("not critical"));

    print_aki(str, der);

    idx->aki++;
  } else if (strcmp(oid, "2.5.29.15") == 0) {
    if (idx->keyusage) {
      addf(str,
           "warning: more than one key usage extension\n");
    }

    addf(str, _("%s\t\tKey Usage (%s):\n"), prefix,
         critical ? _("critical") : _("not critical"));

    snprintf(pfx, sizeof(pfx), "%s\t\t\t", prefix);
    print_key_usage(str, pfx, der);

    idx->keyusage++;
  } else if (strcmp(oid, "2.5.29.16") == 0) {
    if (idx->pkey_usage_period) {
      addf(str,
           "warning: more than one private key usage period extension\n");
    }

    addf(str,
         _("%s\t\tPrivate Key Usage Period (%s):\n"),
         prefix, critical ? _("critical") : _("not critical"));

    print_private_key_usage_period(str, prefix, der);

    idx->pkey_usage_period++;
  } else if (strcmp(oid, "2.5.29.37") == 0) {
    if (idx->keypurpose) {
      addf(str,
           "warning: more than one key purpose extension\n");
    }

    addf(str, _("%s\t\tKey Purpose (%s):\n"), prefix,
         critical ? _("critical") : _("not critical"));

    print_key_purpose(str, prefix, der);
    idx->keypurpose++;
  } else if (strcmp(oid, "2.5.29.17") == 0) {
    if (idx->san) {
      addf(str, "warning: more than one SKI extension\n");
    }

    addf(str,
         _("%s\t\tSubject Alternative Name (%s):\n"),
         prefix, critical ? _("critical") : _("not critical"));
    print_altname(str, prefix, der);
    idx->san++;
  } else if (strcmp(oid, "2.5.29.18") == 0) {
    if (idx->ian) {
      addf(str,
           "warning: more than one Issuer AltName extension\n");
    }

    addf(str,
         _("%s\t\tIssuer Alternative Name (%s):\n"),
         prefix, critical ? _("critical") : _("not critical"));

    print_altname(str, prefix, der);

    idx->ian++;
  } else if (strcmp(oid, "2.5.29.31") == 0) {
    if (idx->crldist) {
      addf(str,
           "warning: more than one CRL distribution point\n");
    }

    addf(str,
         _("%s\t\tCRL Distribution points (%s):\n"),
         prefix, critical ? _("critical") : _("not critical"));

    print_crldist(str, der);
    idx->crldist++;
  } else if (strcmp(oid, "1.3.6.1.5.5.7.1.14") == 0) {
    if (idx->proxy) {
      addf(str, "warning: more than one proxy extension\n");
    }

    addf(str,
         _
         ("%s\t\tProxy Certificate Information (%s):\n"),
         prefix, critical ? _("critical") : _("not critical"));

    print_proxy(str, der);

    idx->proxy++;
  } else if (strcmp(oid, "1.3.6.1.5.5.7.1.1") == 0) {
    addf(str, _("%s\t\tAuthority Information "
          "Access (%s):\n"), prefix,
         critical ? _("critical") : _("not critical"));

    print_aia(str, der);
  } else if (strcmp(oid, GNUTLS_X509EXT_OID_CT_SCT_V1) == 0) {
    addf(str, _("%s\t\tCT Precertificate SCTs (%s):\n"),
         prefix, critical ? _("critical") : _("not critical"));

    print_scts(str, der, prefix);
  } else if (strcmp(oid, "2.5.29.30") == 0) {
    if (idx->nc) {
      addf(str,
           "warning: more than one name constraints extension\n");
    }
    idx->nc++;

    addf(str, _("%s\t\tName Constraints (%s):\n"), prefix,
         critical ? _("critical") : _("not critical"));

    print_nc(str, prefix, der);
  } else if (strcmp(oid, GNUTLS_X509EXT_OID_TLSFEATURES) == 0) {
    if (idx->tlsfeatures) {
      addf(str,
           "warning: more than one tlsfeatures extension\n");
    }

    addf(str, _("%s\t\tTLS Features (%s):\n"),
         prefix, critical ? _("critical") : _("not critical"));

    print_tlsfeatures(str, prefix, der);

    idx->tlsfeatures++;
  } else if (strcmp(oid, "1.2.643.100.111") == 0) {
    addf(str, _("%s\t\tSubject Signing Tool(%s):\n"),
         prefix, critical ? _("critical") : _("not critical"));

    print_subject_sign_tool(str, prefix, der);
  } else if (strcmp(oid, "1.2.643.100.112") == 0) {
    addf(str, _("%s\t\tIssuer Signing Tool(%s):\n"),
         prefix, critical ? _("critical") : _("not critical"));

    print_issuer_sign_tool(str, prefix, der);
  } else if (strcmp(oid, "2.5.4.3") == 0) {
    int ret;
    gnutls_datum_t tmp = { NULL, 0 };

    addf(str, _("%s\t\tCommon Name (%s):\n"),
         prefix, critical ? _("critical") : _("not critical"));

    ret =
        _gnutls_x509_decode_string(ASN1_ETYPE_PRINTABLE_STRING,
                 der->data, der->size, &tmp, 0);
    if (ret < 0) {
      addf(str, "error: x509_decode_string: %s\n",
           gnutls_strerror(ret));
    } else {
      addf(str, "%s\t\t\t%s\n", prefix, tmp.data);
      gnutls_free(tmp.data);
    }
  } else {
    addf(str, _("%s\t\tUnknown extension %s (%s):\n"),
         prefix, oid, critical ? _("critical") : _("not critical"));

    addf(str, _("%s\t\t\tASCII: "), prefix);
    _gnutls_buffer_asciiprint(str, (char *)der->data, der->size);

    addf(str, "\n");
    addf(str, _("%s\t\t\tHexdump: "), prefix);
    _gnutls_buffer_hexprint(str, (char *)der->data, der->size);
    adds(str, "\n");
  }
}

static void
print_extensions(gnutls_buffer_st * str, const char *prefix, int type,
     cert_type_t cert)
{
  unsigned i;
  int err;
  gnutls_datum_t der = { NULL, 0 };
  struct ext_indexes_st idx;

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

  for (i = 0;; i++) {
    char oid[MAX_OID_SIZE] = "";
    size_t sizeof_oid = sizeof(oid);
    unsigned int critical;

    if (type == TYPE_CRT)
      err =
          gnutls_x509_crt_get_extension_info(cert.crt, i,
                     oid,
                     &sizeof_oid,
                     &critical);

    else if (type == TYPE_CRQ)
      err =
          gnutls_x509_crq_get_extension_info(cert.crq, i,
                     oid,
                     &sizeof_oid,
                     &critical);
    else {
      gnutls_assert();
      return;
    }

    if (err == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
      break;
    if (err < 0) {
      addf(str, "error: get_extension_info: %s\n",
           gnutls_strerror(err));
      break;
    }

    if (i == 0)
      addf(str, _("%s\tExtensions:\n"), prefix);

    if (type == TYPE_CRT)
      err =
          gnutls_x509_crt_get_extension_data2(cert.crt, i,
                &der);
    else
      err =
          gnutls_x509_crq_get_extension_data2(cert.crq, i,
                &der);

    if (err < 0) {
      der.data = NULL;
      der.size = 0;
    }

    print_extension(str, prefix, &idx, oid, critical, &der);
    gnutls_free(der.data);
  }
}

static void reverse_datum(gnutls_datum_t * d)
{
  unsigned int i;
  unsigned char c;

  for (i = 0; i < d->size / 2; i++) {
    c = d->data[i];
    d->data[i] = d->data[d->size - i - 1];
    d->data[d->size - i - 1] = c;
  }
}

static void
print_pubkey(gnutls_buffer_st * str, const char *key_name,
       gnutls_pubkey_t pubkey, gnutls_x509_spki_st * spki,
       gnutls_certificate_print_formats_t format)
{
  int err;
  const char *name;
  unsigned bits;
  unsigned pk;

  err = gnutls_pubkey_get_pk_algorithm(pubkey, &bits);
  if (err < 0) {
    addf(str, "error: get_pk_algorithm: %s\n",
         gnutls_strerror(err));
    return;
  }

  pk = err;

  name = gnutls_pk_algorithm_get_name(pk);
  if (name == NULL)
    name = _("unknown");

  addf(str, _("\t%sPublic Key Algorithm: %s\n"), key_name, name);

  addf(str, _("\tAlgorithm Security Level: %s (%d bits)\n"),
       gnutls_sec_param_get_name(gnutls_pk_bits_to_sec_param
               (err, bits)), bits);

  if (spki && pk == GNUTLS_PK_RSA_PSS && spki->pk == pk) {
    addf(str, _("\t\tParameters:\n"));
    addf(str, "\t\t\tHash Algorithm: %s\n",
         gnutls_digest_get_name(spki->rsa_pss_dig));
    addf(str, "\t\t\tSalt Length: %d\n", spki->salt_size);
  }

  switch (pk) {
  case GNUTLS_PK_RSA:
  case GNUTLS_PK_RSA_PSS:
    {
      gnutls_datum_t m, e;

      err = gnutls_pubkey_get_pk_rsa_raw(pubkey, &m, &e);
      if (err < 0)
        addf(str, "error: get_pk_rsa_raw: %s\n",
             gnutls_strerror(err));
      else {
        if (format == GNUTLS_CRT_PRINT_FULL_NUMBERS) {
          addf(str,
               _("\t\tModulus (bits %d): "),
               bits);
          _gnutls_buffer_hexprint(str,
                m.data, m.size);
          adds(str, "\n");
          addf(str,
               _("\t\tExponent (bits %d): "),
               e.size * 8);
          _gnutls_buffer_hexprint(str,
                e.data, e.size);
          adds(str, "\n");
        } else {
          addf(str,
               _("\t\tModulus (bits %d):\n"),
               bits);
          _gnutls_buffer_hexdump(str, m.data,
                     m.size,
                     "\t\t\t");
          addf(str,
               _
               ("\t\tExponent (bits %d):\n"),
               e.size * 8);
          _gnutls_buffer_hexdump(str, e.data,
                     e.size,
                     "\t\t\t");
        }

        gnutls_free(m.data);
        gnutls_free(e.data);
      }

    }
    break;

  case GNUTLS_PK_EDDSA_ED25519:
  case GNUTLS_PK_EDDSA_ED448:
  case GNUTLS_PK_ECDH_X25519:
  case GNUTLS_PK_ECDH_X448:
  case GNUTLS_PK_ECDSA:
    {
      gnutls_datum_t x, y;
      gnutls_ecc_curve_t curve;

      err =
          gnutls_pubkey_get_pk_ecc_raw(pubkey, &curve,
               &x, &y);
      if (err < 0) {
        addf(str, "error: get_pk_ecc_raw: %s\n",
             gnutls_strerror(err));
      } else {
        addf(str, _("\t\tCurve:\t%s\n"),
             gnutls_ecc_curve_get_name(curve));
        if (format == GNUTLS_CRT_PRINT_FULL_NUMBERS) {
          adds(str, _("\t\tX: "));
          _gnutls_buffer_hexprint(str,
                x.data, x.size);
          adds(str, "\n");
          if (y.size > 0) {
            adds(str, _("\t\tY: "));
            _gnutls_buffer_hexprint(str,
                  y.data,
                  y.size);
            adds(str, "\n");
          }
        } else {
          adds(str, _("\t\tX:\n"));
          _gnutls_buffer_hexdump(str, x.data,
                     x.size,
                     "\t\t\t");
          if (y.size > 0) {
            adds(str, _("\t\tY:\n"));
            _gnutls_buffer_hexdump(str,
                       y.data,
                       y.size,
                       "\t\t\t");
          }
        }

        gnutls_free(x.data);
        gnutls_free(y.data);

      }
    }
    break;
  case GNUTLS_PK_DSA:
    {
      gnutls_datum_t p, q, g, y;

      err =
          gnutls_pubkey_get_pk_dsa_raw(pubkey, &p, &q,
               &g, &y);
      if (err < 0)
        addf(str, "error: get_pk_dsa_raw: %s\n",
             gnutls_strerror(err));
      else {
        if (format == GNUTLS_CRT_PRINT_FULL_NUMBERS) {
          addf(str,
               _
               ("\t\tPublic key (bits %d): "),
               bits);
          _gnutls_buffer_hexprint(str,
                y.data, y.size);
          adds(str, "\n");
          adds(str, _("\t\tP: "));
          _gnutls_buffer_hexprint(str,
                p.data, p.size);
          adds(str, "\n");
          adds(str, _("\t\tQ: "));
          _gnutls_buffer_hexprint(str,
                q.data, q.size);
          adds(str, "\n");
          adds(str, _("\t\tG: "));
          _gnutls_buffer_hexprint(str,
                g.data, g.size);
          adds(str, "\n");
        } else {
          addf(str,
               _
               ("\t\tPublic key (bits %d):\n"),
               bits);
          _gnutls_buffer_hexdump(str, y.data,
                     y.size,
                     "\t\t\t");
          adds(str, _("\t\tP:\n"));
          _gnutls_buffer_hexdump(str, p.data,
                     p.size,
                     "\t\t\t");
          adds(str, _("\t\tQ:\n"));
          _gnutls_buffer_hexdump(str, q.data,
                     q.size,
                     "\t\t\t");
          adds(str, _("\t\tG:\n"));
          _gnutls_buffer_hexdump(str, g.data,
                     g.size,
                     "\t\t\t");
        }

        gnutls_free(p.data);
        gnutls_free(q.data);
        gnutls_free(g.data);
        gnutls_free(y.data);

      }
    }
    break;

  case GNUTLS_PK_GOST_01:
  case GNUTLS_PK_GOST_12_256:
  case GNUTLS_PK_GOST_12_512:
    {
      gnutls_datum_t x, y;
      gnutls_ecc_curve_t curve;
      gnutls_digest_algorithm_t digest;
      gnutls_gost_paramset_t param;

      err =
          gnutls_pubkey_export_gost_raw2(pubkey, &curve,
                 &digest,
                 &param, &x, &y, 0);
      if (err < 0)
        addf(str, "error: get_pk_gost_raw: %s\n",
             gnutls_strerror(err));
      else {
        addf(str, _("\t\tCurve:\t%s\n"),
             gnutls_ecc_curve_get_name(curve));
        addf(str, _("\t\tDigest:\t%s\n"),
             gnutls_digest_get_name(digest));
        addf(str, _("\t\tParamSet: %s\n"),
             gnutls_gost_paramset_get_name(param));
        reverse_datum(&x);
        reverse_datum(&y);
        if (format == GNUTLS_CRT_PRINT_FULL_NUMBERS) {
          adds(str, _("\t\tX: "));
          _gnutls_buffer_hexprint(str,
                x.data, x.size);
          adds(str, "\n");
          adds(str, _("\t\tY: "));
          _gnutls_buffer_hexprint(str,
                y.data, y.size);
          adds(str, "\n");
        } else {
          adds(str, _("\t\tX:\n"));
          _gnutls_buffer_hexdump(str, x.data,
                     x.size,
                     "\t\t\t");
          adds(str, _("\t\tY:\n"));
          _gnutls_buffer_hexdump(str, y.data,
                     y.size,
                     "\t\t\t");
        }

        gnutls_free(x.data);
        gnutls_free(y.data);

      }
    }
    break;

  default:
    break;
  }
}

static int
print_crt_sig_params(gnutls_buffer_st * str, gnutls_x509_crt_t crt,
         gnutls_certificate_print_formats_t format)
{
  int ret;
  gnutls_pk_algorithm_t pk;
  gnutls_x509_spki_st params;
  gnutls_sign_algorithm_t sign;

  sign = gnutls_x509_crt_get_signature_algorithm(crt);
  pk = gnutls_sign_get_pk_algorithm(sign);
  if (pk == GNUTLS_PK_RSA_PSS) {
    ret = _gnutls_x509_read_sign_params(crt->cert,
                "signatureAlgorithm",
                &params);
    if (ret < 0) {
      addf(str, "error: read_pss_params: %s\n",
           gnutls_strerror(ret));
    } else
      addf(str, "\t\tSalt Length: %d\n", params.salt_size);
  }

  return 0;
}

static void print_pk_name(gnutls_buffer_st * str, gnutls_x509_crt_t crt)
{
  const char *p;
  char *name = get_pk_name(crt, NULL);
  if (name == NULL)
    p = _("unknown");
  else
    p = name;

  addf(str, "\tSubject Public Key Algorithm: %s\n", p);
  gnutls_free(name);
}

static int
print_crt_pubkey(gnutls_buffer_st * str, gnutls_x509_crt_t crt,
     gnutls_certificate_print_formats_t format)
{
  gnutls_pubkey_t pubkey = NULL;
  gnutls_x509_spki_st params;
  int ret, pk;

  ret = _gnutls_x509_crt_read_spki_params(crt, &params);
  if (ret < 0)
    return ret;

  pk = gnutls_x509_crt_get_pk_algorithm(crt, NULL);
  if (pk < 0) {
    gnutls_assert();
    pk = GNUTLS_PK_UNKNOWN;
  }

  if (pk == GNUTLS_PK_UNKNOWN) {
    print_pk_name(str, crt);  /* print basic info only */
    return 0;
  }

  ret = gnutls_pubkey_init(&pubkey);
  if (ret < 0)
    return ret;

  ret = gnutls_pubkey_import_x509(pubkey, crt, 0);
  if (ret < 0) {
    if (ret != GNUTLS_E_UNIMPLEMENTED_FEATURE)
      addf(str, "error importing public key: %s\n",
           gnutls_strerror(ret));
    print_pk_name(str, crt);  /* print basic info only */
    ret = 0;
    goto cleanup;
  }

  print_pubkey(str, _("Subject "), pubkey, &params, format);
  ret = 0;

 cleanup:
  gnutls_pubkey_deinit(pubkey);

  return ret;
}

static void
print_cert(gnutls_buffer_st * str, gnutls_x509_crt_t cert,
     gnutls_certificate_print_formats_t format)
{
  /* Version. */
  {
    int version = gnutls_x509_crt_get_version(cert);
    if (version < 0)
      addf(str, "error: get_version: %s\n",
           gnutls_strerror(version));
    else
      addf(str, _("\tVersion: %d\n"), version);
  }

  /* Serial. */
  {
    char serial[128];
    size_t serial_size = sizeof(serial);
    int err;

    err = gnutls_x509_crt_get_serial(cert, serial, &serial_size);
    if (err < 0)
      addf(str, "error: get_serial: %s\n",
           gnutls_strerror(err));
    else {
      adds(str, _("\tSerial Number (hex): "));
      _gnutls_buffer_hexprint(str, serial, serial_size);
      adds(str, "\n");
    }
  }

  /* Issuer. */
  if (format != GNUTLS_CRT_PRINT_UNSIGNED_FULL) {
    gnutls_datum_t dn;
    int err;

    err = gnutls_x509_crt_get_issuer_dn3(cert, &dn, 0);
    if (err == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
      addf(str, _("\tIssuer:\n"));
    } else if (err < 0) {
      addf(str, "error: get_issuer_dn: %s\n",
           gnutls_strerror(err));
    } else {
      addf(str, _("\tIssuer: %s\n"), dn.data);
      gnutls_free(dn.data);
    }
  }

  /* Validity. */
  {
    time_t tim;

    adds(str, _("\tValidity:\n"));

    tim = gnutls_x509_crt_get_activation_time(cert);
    if (tim != -1) {
      char s[42];
      size_t max = sizeof(s);
      struct tm t;

      if (gmtime_r(&tim, &t) == NULL)
        addf(str, "error: gmtime_r (%ld)\n",
             (unsigned long)tim);
      else if (strftime
         (s, max, "%a %b %d %H:%M:%S UTC %Y", &t) == 0)
        addf(str, "error: strftime (%ld)\n",
             (unsigned long)tim);
      else
        addf(str, _("\t\tNot Before: %s\n"), s);
    } else {
      addf(str, _("\t\tNot Before: %s\n"), _("unknown"));
    }

    tim = gnutls_x509_crt_get_expiration_time(cert);
    if (tim != -1) {
      char s[42];
      size_t max = sizeof(s);
      struct tm t;

      if (gmtime_r(&tim, &t) == NULL)
        addf(str, "error: gmtime_r (%ld)\n",
             (unsigned long)tim);
      else if (strftime
         (s, max, "%a %b %d %H:%M:%S UTC %Y", &t) == 0)
        addf(str, "error: strftime (%ld)\n",
             (unsigned long)tim);
      else
        addf(str, _("\t\tNot After: %s\n"), s);
    } else {
      addf(str, _("\t\tNot After: %s\n"), _("unknown"));
    }
  }

  /* Subject. */
  {
    gnutls_datum_t dn;
    int err;

    err = gnutls_x509_crt_get_dn3(cert, &dn, 0);
    if (err == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
      addf(str, _("\tSubject:\n"));
    } else if (err < 0) {
      addf(str, "error: get_dn: %s\n", gnutls_strerror(err));
    } else {
      addf(str, _("\tSubject: %s\n"), dn.data);
      gnutls_free(dn.data);
    }
  }

  /* SubjectPublicKeyInfo. */
  print_crt_pubkey(str, cert, format);

  print_unique_ids(str, cert);

  /* Extensions. */
  if (gnutls_x509_crt_get_version(cert) >= 3) {
    cert_type_t ccert;

    ccert.crt = cert;
    print_extensions(str, "", TYPE_CRT, ccert);
  }

  /* Signature. */
  if (format != GNUTLS_CRT_PRINT_UNSIGNED_FULL) {
    int err;
    size_t size = 0;
    char *buffer = NULL;
    char *name;
    const char *p;

    name = get_sign_name(cert, &err);
    if (name == NULL)
      p = _("unknown");
    else
      p = name;

    addf(str, _("\tSignature Algorithm: %s\n"), p);
    gnutls_free(name);

    print_crt_sig_params(str, cert, format);

    if (err != GNUTLS_SIGN_UNKNOWN
        && gnutls_sign_is_secure2(err,
                GNUTLS_SIGN_FLAG_SECURE_FOR_CERTS)
        == 0) {
      adds(str,
           _("warning: signed using a broken signature "
             "algorithm that can be forged.\n"));
    }

    err = gnutls_x509_crt_get_signature(cert, buffer, &size);
    if (err != GNUTLS_E_SHORT_MEMORY_BUFFER) {
      addf(str, "error: get_signature: %s\n",
           gnutls_strerror(err));
      return;
    }

    buffer = gnutls_malloc(size);
    if (!buffer) {
      addf(str, "error: malloc: %s\n",
           gnutls_strerror(GNUTLS_E_MEMORY_ERROR));
      return;
    }

    err = gnutls_x509_crt_get_signature(cert, buffer, &size);
    if (err < 0) {
      gnutls_free(buffer);
      addf(str, "error: get_signature2: %s\n",
           gnutls_strerror(err));
      return;
    }

    adds(str, _("\tSignature:\n"));
    _gnutls_buffer_hexdump(str, buffer, size, "\t\t");

    gnutls_free(buffer);
  }
}

static void print_fingerprint(gnutls_buffer_st * str, gnutls_x509_crt_t cert)
{
  int err;
  char buffer[MAX_HASH_SIZE];
  size_t size = sizeof(buffer);

  adds(str, _("\tFingerprint:\n"));

  err =
      gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_SHA1, buffer,
              &size);
  if (err < 0) {
    addf(str, "error: get_fingerprint: %s\n", gnutls_strerror(err));
    return;
  }

  adds(str, _("\t\tsha1:"));
  _gnutls_buffer_hexprint(str, buffer, size);
  adds(str, "\n");

  size = sizeof(buffer);
  err =
      gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_SHA256, buffer,
              &size);
  if (err < 0) {
    addf(str, "error: get_fingerprint: %s\n", gnutls_strerror(err));
    return;
  }
  adds(str, _("\t\tsha256:"));
  _gnutls_buffer_hexprint(str, buffer, size);
  adds(str, "\n");
}

typedef int get_id_func(void *obj, unsigned, unsigned char *, size_t *);

static void print_obj_id(gnutls_buffer_st * str, const char *prefix, void *obj,
       get_id_func * get_id)
{
  unsigned char sha1_buffer[MAX_HASH_SIZE];
  unsigned char sha2_buffer[MAX_HASH_SIZE];
  int err;
  size_t sha1_size, sha2_size;

  sha1_size = sizeof(sha1_buffer);
  err = get_id(obj, GNUTLS_KEYID_USE_SHA1, sha1_buffer, &sha1_size);
  if (err == GNUTLS_E_UNIMPLEMENTED_FEATURE) /* unsupported algo */
    return;

  if (err < 0) {
    addf(str, "error: get_key_id(sha1): %s\n",
         gnutls_strerror(err));
    return;
  }

  sha2_size = sizeof(sha2_buffer);
  err = get_id(obj, GNUTLS_KEYID_USE_SHA256, sha2_buffer, &sha2_size);
  if (err == GNUTLS_E_UNIMPLEMENTED_FEATURE) /* unsupported algo */
    return;

  if (err < 0) {
    addf(str, "error: get_key_id(sha256): %s\n",
         gnutls_strerror(err));
    return;
  }

  addf(str, _("%sPublic Key ID:\n%s\tsha1:"), prefix, prefix);
  _gnutls_buffer_hexprint(str, sha1_buffer, sha1_size);
  addf(str, "\n%s\tsha256:", prefix);
  _gnutls_buffer_hexprint(str, sha2_buffer, sha2_size);
  adds(str, "\n");

  addf(str, _("%sPublic Key PIN:\n%s\tpin-sha256:"), prefix, prefix);
  _gnutls_buffer_base64print(str, sha2_buffer, sha2_size);
  adds(str, "\n");

  return;
}

static void print_keyid(gnutls_buffer_st * str, gnutls_x509_crt_t cert)
{
  int err;
  const char *name;
  unsigned int bits;
  unsigned char sha1_buffer[MAX_HASH_SIZE];
  size_t sha1_size;

  err = gnutls_x509_crt_get_pk_algorithm(cert, &bits);
  if (err < 0)
    return;

  print_obj_id(str, "\t", cert,
         (get_id_func *) gnutls_x509_crt_get_key_id);

  if (IS_EC(err)) {
    gnutls_ecc_curve_t curve;

    err = gnutls_x509_crt_get_pk_ecc_raw(cert, &curve, NULL, NULL);
    if (err < 0)
      return;

    name = gnutls_ecc_curve_get_name(curve);
    bits = 0;
  } else if (IS_GOSTEC(err)) {
    gnutls_ecc_curve_t curve;

    err =
        gnutls_x509_crt_get_pk_gost_raw(cert, &curve, NULL, NULL,
                NULL, NULL);
    if (err < 0)
      return;

    name = gnutls_ecc_curve_get_name(curve);
    bits = 0;
  } else {
    name = gnutls_pk_get_name(err);
  }

  if (name == NULL)
    return;

  sha1_size = sizeof(sha1_buffer);
  err =
      gnutls_x509_crt_get_key_id(cert, GNUTLS_KEYID_USE_SHA1, sha1_buffer,
               &sha1_size);
  if (err == GNUTLS_E_UNIMPLEMENTED_FEATURE) /* unsupported algo */
    return;
}

static void
print_other(gnutls_buffer_st * str, gnutls_x509_crt_t cert,
      gnutls_certificate_print_formats_t format)
{
  if (format != GNUTLS_CRT_PRINT_UNSIGNED_FULL) {
    print_fingerprint(str, cert);
  }
  print_keyid(str, cert);
}

static void print_oneline(gnutls_buffer_st * str, gnutls_x509_crt_t cert)
{
  int err;

  /* Subject. */
  {
    gnutls_datum_t dn;

    err = gnutls_x509_crt_get_dn3(cert, &dn, 0);
    if (err == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
      addf(str, _("no subject,"));
    } else if (err < 0) {
      addf(str, "unknown subject (%s), ",
           gnutls_strerror(err));
    } else {
      addf(str, "subject `%s', ", dn.data);
      gnutls_free(dn.data);
    }
  }

  /* Issuer. */
  {
    gnutls_datum_t dn;

    err = gnutls_x509_crt_get_issuer_dn3(cert, &dn, 0);
    if (err == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
      addf(str, _("no issuer,"));
    } else if (err < 0) {
      addf(str, "unknown issuer (%s), ",
           gnutls_strerror(err));
    } else {
      addf(str, "issuer `%s', ", dn.data);
      gnutls_free(dn.data);
    }
  }

  {
    char serial[128];
    size_t serial_size = sizeof(serial);

    err = gnutls_x509_crt_get_serial(cert, serial, &serial_size);
    if (err >= 0) {
      adds(str, "serial 0x");
      _gnutls_buffer_hexprint(str, serial, serial_size);
      adds(str, ", ");
    }
  }

  /* Key algorithm and size. */
  {
    unsigned int bits;
    const char *p;
    char *name = get_pk_name(cert, &bits);
    if (name == NULL)
      p = _("unknown");
    else
      p = name;
    addf(str, "%s key %d bits, ", p, bits);
    gnutls_free(name);
  }

  /* Signature Algorithm. */
  {
    char *name = get_sign_name(cert, &err);
    const char *p;

    if (name == NULL)
      p = _("unknown");
    else
      p = name;

    if (err != GNUTLS_SIGN_UNKNOWN
        && gnutls_sign_is_secure2(err,
                GNUTLS_SIGN_FLAG_SECURE_FOR_CERTS)
        == 0)
      addf(str, _("signed using %s (broken!), "), p);
    else
      addf(str, _("signed using %s, "), p);
    gnutls_free(name);
  }

  /* Validity. */
  {
    time_t tim;

    tim = gnutls_x509_crt_get_activation_time(cert);
    {
      char s[42];
      size_t max = sizeof(s);
      struct tm t;

      if (gmtime_r(&tim, &t) == NULL)
        addf(str, "unknown activation (%ld), ",
             (unsigned long)tim);
      else if (strftime
         (s, max, "%Y-%m-%d %H:%M:%S UTC", &t) == 0)
        addf(str, "failed activation (%ld), ",
             (unsigned long)tim);
      else
        addf(str, "activated `%s', ", s);
    }

    tim = gnutls_x509_crt_get_expiration_time(cert);
    {
      char s[42];
      size_t max = sizeof(s);
      struct tm t;

      if (gmtime_r(&tim, &t) == NULL)
        addf(str, "unknown expiry (%ld), ",
             (unsigned long)tim);
      else if (strftime
         (s, max, "%Y-%m-%d %H:%M:%S UTC", &t) == 0)
        addf(str, "failed expiry (%ld), ",
             (unsigned long)tim);
      else
        addf(str, "expires `%s', ", s);
    }
  }

  {
    int pathlen;
    char *policyLanguage;

    err = gnutls_x509_crt_get_proxy(cert, NULL,
            &pathlen, &policyLanguage,
            NULL, NULL);
    if (err == 0) {
      addf(str, "proxy certificate (policy=");
      if (strcmp(policyLanguage, "1.3.6.1.5.5.7.21.1") == 0)
        addf(str, "id-ppl-inheritALL");
      else if (strcmp
         (policyLanguage, "1.3.6.1.5.5.7.21.2") == 0)
        addf(str, "id-ppl-independent");
      else
        addf(str, "%s", policyLanguage);
      if (pathlen >= 0)
        addf(str, ", pathlen=%d), ", pathlen);
      else
        addf(str, "), ");
      gnutls_free(policyLanguage);
    }
  }

  {
    unsigned char buffer[MAX_HASH_SIZE];
    size_t size = sizeof(buffer);

    err = gnutls_x509_crt_get_key_id(cert, GNUTLS_KEYID_USE_SHA256,
             buffer, &size);
    if (err >= 0) {
      addf(str, "pin-sha256=\"");
      _gnutls_buffer_base64print(str, buffer, size);
      adds(str, "\"");
    }
  }

}

/**
 * gnutls_x509_crt_print:
 * @cert: The data to be printed
 * @format: Indicate the format to use
 * @out: Newly allocated datum with null terminated string.
 *
 * This function will pretty print a X.509 certificate, suitable for
 * display to a human.
 *
 * If the format is %GNUTLS_CRT_PRINT_FULL then all fields of the
 * certificate will be output, on multiple lines.  The
 * %GNUTLS_CRT_PRINT_ONELINE format will generate one line with some
 * selected fields, which is useful for logging purposes.
 *
 * The output @out needs to be deallocated using gnutls_free().
 *
 * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise a
 *   negative error value.
 **/
int
gnutls_x509_crt_print(gnutls_x509_crt_t cert,
          gnutls_certificate_print_formats_t format,
          gnutls_datum_t * out)
{
  gnutls_buffer_st str;
  int ret;

  if (format == GNUTLS_CRT_PRINT_COMPACT) {
    _gnutls_buffer_init(&str);

    print_oneline(&str, cert);

    ret = _gnutls_buffer_append_data(&str, "\n", 1);
    if (ret < 0)
      return gnutls_assert_val(ret);

    print_keyid(&str, cert);

    return _gnutls_buffer_to_datum(&str, out, 1);
  } else if (format == GNUTLS_CRT_PRINT_ONELINE) {
    _gnutls_buffer_init(&str);

    print_oneline(&str, cert);

    return _gnutls_buffer_to_datum(&str, out, 1);
  } else {
    _gnutls_buffer_init(&str);

    _gnutls_buffer_append_str(&str,
            _
            ("X.509 Certificate Information:\n"));

    print_cert(&str, cert, format);

    _gnutls_buffer_append_str(&str, _("Other Information:\n"));

    print_other(&str, cert, format);

    return _gnutls_buffer_to_datum(&str, out, 1);
  }
}

static void
print_crl(gnutls_buffer_st * str, gnutls_x509_crl_t crl, int notsigned)
{
  /* Version. */
  {
    int version = gnutls_x509_crl_get_version(crl);
    if (version < 0)
      addf(str, "error: get_version: %s\n",
           gnutls_strerror(version));
    else
      addf(str, _("\tVersion: %d\n"), version);
  }

  /* Issuer. */
  if (!notsigned) {
    gnutls_datum_t dn;
    int err;

    err = gnutls_x509_crl_get_issuer_dn3(crl, &dn, 0);
    if (err == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
      addf(str, _("\tIssuer:\n"));
    } else if (err < 0) {
      addf(str, "error: get_issuer_dn: %s\n",
           gnutls_strerror(err));
    } else {
      addf(str, _("\tIssuer: %s\n"), dn.data);
      gnutls_free(dn.data);
    }
  }

  /* Validity. */
  {
    time_t tim;

    adds(str, _("\tUpdate dates:\n"));

    tim = gnutls_x509_crl_get_this_update(crl);
    {
      char s[42];
      size_t max = sizeof(s);
      struct tm t;

      if (gmtime_r(&tim, &t) == NULL)
        addf(str, "error: gmtime_r (%ld)\n",
             (unsigned long)tim);
      else if (strftime
         (s, max, "%a %b %d %H:%M:%S UTC %Y", &t) == 0)
        addf(str, "error: strftime (%ld)\n",
             (unsigned long)tim);
      else
        addf(str, _("\t\tIssued: %s\n"), s);
    }

    tim = gnutls_x509_crl_get_next_update(crl);
    {
      char s[42];
      size_t max = sizeof(s);
      struct tm t;

      if (tim == -1)
        addf(str, "\t\tNo next update time.\n");
      else if (gmtime_r(&tim, &t) == NULL)
        addf(str, "error: gmtime_r (%ld)\n",
             (unsigned long)tim);
      else if (strftime
         (s, max, "%a %b %d %H:%M:%S UTC %Y", &t) == 0)
        addf(str, "error: strftime (%ld)\n",
             (unsigned long)tim);
      else
        addf(str, _("\t\tNext at: %s\n"), s);
    }
  }

  /* Extensions. */
  if (gnutls_x509_crl_get_version(crl) >= 2) {
    size_t i;
    int err = 0;
    int aki_idx = 0;
    int crl_nr = 0;

    for (i = 0;; i++) {
      char oid[MAX_OID_SIZE] = "";
      size_t sizeof_oid = sizeof(oid);
      unsigned int critical;

      err = gnutls_x509_crl_get_extension_info(crl, i,
                 oid,
                 &sizeof_oid,
                 &critical);
      if (err == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
        break;
      if (err < 0) {
        addf(str,
             "error: get_extension_info: %s\n",
             gnutls_strerror(err));
        break;
      }

      if (i == 0)
        adds(str, _("\tExtensions:\n"));

      if (strcmp(oid, "2.5.29.20") == 0) {
        char nr[128];
        size_t nr_size = sizeof(nr);

        if (crl_nr) {
          addf(str,
               "warning: more than one CRL number\n");
        }

        err =
            gnutls_x509_crl_get_number(crl, nr,
                     &nr_size,
                     &critical);

        addf(str, _("\t\tCRL Number (%s): "),
             critical ? _("critical") :
             _("not critical"));

        if (err < 0)
          addf(str,
               "error: get_number: %s\n",
               gnutls_strerror(err));
        else {
          _gnutls_buffer_hexprint(str, nr,
                nr_size);
          addf(str, "\n");
        }

        crl_nr++;
      } else if (strcmp(oid, "2.5.29.35") == 0) {
        gnutls_datum_t der;

        if (aki_idx) {
          addf(str,
               "warning: more than one AKI extension\n");
        }

        addf(str,
             _
             ("\t\tAuthority Key Identifier (%s):\n"),
             critical ? _("critical") :
             _("not critical"));

        err =
            gnutls_x509_crl_get_extension_data2(crl, i,
                  &der);
        if (err < 0) {
          addf(str,
               "error: get_extension_data2: %s\n",
               gnutls_strerror(err));
          continue;
        }
        print_aki(str, &der);
        gnutls_free(der.data);

        aki_idx++;
      } else {
        gnutls_datum_t der;

        addf(str,
             _("\t\tUnknown extension %s (%s):\n"),
             oid,
             critical ? _("critical") :
             _("not critical"));

        err =
            gnutls_x509_crl_get_extension_data2(crl,
                  i,
                  &der);
        if (err < 0) {
          addf(str,
               "error: get_extension_data2: %s\n",
               gnutls_strerror(err));
          continue;
        }

        adds(str, _("\t\t\tASCII: "));
        _gnutls_buffer_asciiprint(str, (char *)der.data,
                der.size);
        adds(str, "\n");

        adds(str, _("\t\t\tHexdump: "));
        _gnutls_buffer_hexprint(str, der.data,
              der.size);
        adds(str, "\n");

        gnutls_free(der.data);
      }
    }
  }

  /* Revoked certificates. */
  {
    int num = gnutls_x509_crl_get_crt_count(crl);
    gnutls_x509_crl_iter_t iter = NULL;
    int j;

    if (num)
      addf(str, _("\tRevoked certificates (%d):\n"), num);
    else
      adds(str, _("\tNo revoked certificates.\n"));

    for (j = 0; j < num; j++) {
      unsigned char serial[128];
      size_t serial_size = sizeof(serial);
      int err;
      time_t tim;

      err =
          gnutls_x509_crl_iter_crt_serial(crl, &iter, serial,
                  &serial_size, &tim);
      if (err < 0) {
        addf(str, "error: iter_crt_serial: %s\n",
             gnutls_strerror(err));
        break;
      } else {
        char s[42];
        size_t max = sizeof(s);
        struct tm t;

        adds(str, _("\t\tSerial Number (hex): "));
        _gnutls_buffer_hexprint(str, serial,
              serial_size);
        adds(str, "\n");

        if (gmtime_r(&tim, &t) == NULL)
          addf(str,
               "error: gmtime_r (%ld)\n",
               (unsigned long)tim);
        else if (strftime
           (s, max,
            "%a %b %d %H:%M:%S UTC %Y", &t) == 0)
          addf(str,
               "error: strftime (%ld)\n",
               (unsigned long)tim);
        else
          addf(str, _("\t\tRevoked at: %s\n"), s);
      }
    }
    gnutls_x509_crl_iter_deinit(iter);
  }

  /* Signature. */
  if (!notsigned) {
    int err;
    size_t size = 0;
    char *buffer = NULL;
    char *name;
    const char *p;

    name = crl_get_sign_name(crl, &err);
    if (name == NULL)
      p = _("unknown");
    else
      p = name;

    addf(str, _("\tSignature Algorithm: %s\n"), p);
    gnutls_free(name);

    if (err != GNUTLS_SIGN_UNKNOWN
        && gnutls_sign_is_secure2(err,
                GNUTLS_SIGN_FLAG_SECURE_FOR_CERTS)
        == 0) {
      adds(str,
           _("warning: signed using a broken signature "
             "algorithm that can be forged.\n"));
    }

    err = gnutls_x509_crl_get_signature(crl, buffer, &size);
    if (err != GNUTLS_E_SHORT_MEMORY_BUFFER) {
      addf(str, "error: get_signature: %s\n",
           gnutls_strerror(err));
      return;
    }

    buffer = gnutls_malloc(size);
    if (!buffer) {
      addf(str, "error: malloc: %s\n",
           gnutls_strerror(GNUTLS_E_MEMORY_ERROR));
      return;
    }

    err = gnutls_x509_crl_get_signature(crl, buffer, &size);
    if (err < 0) {
      gnutls_free(buffer);
      addf(str, "error: get_signature2: %s\n",
           gnutls_strerror(err));
      return;
    }

    adds(str, _("\tSignature:\n"));
    _gnutls_buffer_hexdump(str, buffer, size, "\t\t");

    gnutls_free(buffer);
  }
}

/**
 * gnutls_x509_crl_print:
 * @crl: The data to be printed
 * @format: Indicate the format to use
 * @out: Newly allocated datum with null terminated string.
 *
 * This function will pretty print a X.509 certificate revocation
 * list, suitable for display to a human.
 *
 * The output @out needs to be deallocated using gnutls_free().
 *
 * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise a
 *   negative error value.
 **/
int
gnutls_x509_crl_print(gnutls_x509_crl_t crl,
          gnutls_certificate_print_formats_t format,
          gnutls_datum_t * out)
{
  gnutls_buffer_st str;

  _gnutls_buffer_init(&str);

  _gnutls_buffer_append_str
      (&str, _("X.509 Certificate Revocation List Information:\n"));

  print_crl(&str, crl, format == GNUTLS_CRT_PRINT_UNSIGNED_FULL);

  return _gnutls_buffer_to_datum(&str, out, 1);
}

static int
print_crq_sig_params(gnutls_buffer_st * str, gnutls_x509_crq_t crt,
         gnutls_certificate_print_formats_t format)
{
  int ret;
  gnutls_pk_algorithm_t pk;
  gnutls_x509_spki_st params;
  gnutls_sign_algorithm_t sign;

  sign = gnutls_x509_crq_get_signature_algorithm(crt);
  pk = gnutls_sign_get_pk_algorithm(sign);
  if (pk == GNUTLS_PK_RSA_PSS) {
    ret = _gnutls_x509_read_sign_params(crt->crq,
                "signatureAlgorithm",
                &params);
    if (ret < 0) {
      addf(str, "error: read_pss_params: %s\n",
           gnutls_strerror(ret));
    } else
      addf(str, "\t\tSalt Length: %d\n", params.salt_size);
  }

  return 0;
}

static int
print_crq_pubkey(gnutls_buffer_st * str, gnutls_x509_crq_t crq,
     gnutls_certificate_print_formats_t format)
{
  gnutls_pubkey_t pubkey;
  gnutls_x509_spki_st params;
  int ret;

  ret = _gnutls_x509_crq_read_spki_params(crq, &params);
  if (ret < 0)
    return ret;

  ret = gnutls_pubkey_init(&pubkey);
  if (ret < 0)
    return ret;

  ret = gnutls_pubkey_import_x509_crq(pubkey, crq, 0);
  if (ret < 0)
    goto cleanup;

  print_pubkey(str, _("Subject "), pubkey, &params, format);
  ret = 0;

 cleanup:
  gnutls_pubkey_deinit(pubkey);

  if (ret < 0) {   /* print only name */
    const char *p;
    char *name = crq_get_pk_name(crq);
    if (name == NULL)
      p = _("unknown");
    else
      p = name;

    addf(str, "\tSubject Public Key Algorithm: %s\n", p);
    gnutls_free(name);
    ret = 0;
  }

  return ret;
}

static void
print_crq(gnutls_buffer_st * str, gnutls_x509_crq_t cert,
    gnutls_certificate_print_formats_t format)
{
  /* Version. */
  {
    int version = gnutls_x509_crq_get_version(cert);
    if (version < 0)
      addf(str, "error: get_version: %s\n",
           gnutls_strerror(version));
    else
      addf(str, _("\tVersion: %d\n"), version);
  }

  /* Subject */
  {
    gnutls_datum_t dn;
    int err;

    err = gnutls_x509_crq_get_dn3(cert, &dn, 0);
    if (err == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
      addf(str, _("\tSubject:\n"));
    } else if (err < 0) {
      addf(str, "error: get_dn: %s\n", gnutls_strerror(err));
    } else {
      addf(str, _("\tSubject: %s\n"), dn.data);
      gnutls_free(dn.data);
    }
  }

  {
    char *name;
    const char *p;

    print_crq_pubkey(str, cert, format);

    name = crq_get_sign_name(cert);
    if (name == NULL)
      p = _("unknown");
    else
      p = name;

    addf(str, _("\tSignature Algorithm: %s\n"), p);

    gnutls_free(name);

    print_crq_sig_params(str, cert, format);
  }

  /* parse attributes */
  {
    size_t i;
    int err = 0;
    int extensions = 0;
    int challenge = 0;

    for (i = 0;; i++) {
      char oid[MAX_OID_SIZE] = "";
      size_t sizeof_oid = sizeof(oid);

      err =
          gnutls_x509_crq_get_attribute_info(cert, i,
                     oid,
                     &sizeof_oid);
      if (err == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
        break;
      if (err < 0) {
        addf(str,
             "error: get_extension_info: %s\n",
             gnutls_strerror(err));
        break;
      }

      if (i == 0)
        adds(str, _("\tAttributes:\n"));

      if (strcmp(oid, "1.2.840.113549.1.9.14") == 0) {
        cert_type_t ccert;

        if (extensions) {
          addf(str,
               "warning: more than one extensionsRequest\n");
        }

        ccert.crq = cert;
        print_extensions(str, "\t", TYPE_CRQ, ccert);

        extensions++;
      } else if (strcmp(oid, "1.2.840.113549.1.9.7") == 0) {
        char *pass;
        size_t size;

        if (challenge) {
          adds(str,
               "warning: more than one Challenge password attribute\n");
        }

        err =
            gnutls_x509_crq_get_challenge_password
            (cert, NULL, &size);
        if (err < 0
            && err != GNUTLS_E_SHORT_MEMORY_BUFFER) {
          addf(str,
               "error: get_challenge_password: %s\n",
               gnutls_strerror(err));
          continue;
        }

        size++;

        pass = gnutls_malloc(size);
        if (!pass) {
          addf(str, "error: malloc: %s\n",
               gnutls_strerror
               (GNUTLS_E_MEMORY_ERROR));
          continue;
        }

        err =
            gnutls_x509_crq_get_challenge_password
            (cert, pass, &size);
        if (err < 0)
          addf(str,
               "error: get_challenge_password: %s\n",
               gnutls_strerror(err));
        else
          addf(str,
               _
               ("\t\tChallenge password: %s\n"),
               pass);

        gnutls_free(pass);

        challenge++;
      } else {
        char *buffer;
        size_t extlen = 0;

        addf(str, _("\t\tUnknown attribute %s:\n"),
             oid);

        err =
            gnutls_x509_crq_get_attribute_data
            (cert, i, NULL, &extlen);
        if (err < 0) {
          addf(str,
               "error: get_attribute_data: %s\n",
               gnutls_strerror(err));
          continue;
        }

        buffer = gnutls_malloc(extlen);
        if (!buffer) {
          addf(str, "error: malloc: %s\n",
               gnutls_strerror
               (GNUTLS_E_MEMORY_ERROR));
          continue;
        }

        err =
            gnutls_x509_crq_get_attribute_data
            (cert, i, buffer, &extlen);
        if (err < 0) {
          gnutls_free(buffer);
          addf(str,
               "error: get_attribute_data2: %s\n",
               gnutls_strerror(err));
          continue;
        }

        adds(str, _("\t\t\tASCII: "));
        _gnutls_buffer_asciiprint(str, buffer, extlen);
        adds(str, "\n");

        adds(str, _("\t\t\tHexdump: "));
        _gnutls_buffer_hexprint(str, buffer, extlen);
        adds(str, "\n");

        gnutls_free(buffer);
      }
    }
  }
}

static void print_crq_other(gnutls_buffer_st * str, gnutls_x509_crq_t crq)
{
  int ret;

  /* on unknown public key algorithms don't print the key ID */
  ret = gnutls_x509_crq_get_pk_algorithm(crq, NULL);
  if (ret < 0)
    return;

  print_obj_id(str, "\t", crq,
         (get_id_func *) gnutls_x509_crq_get_key_id);
}

/**
 * gnutls_x509_crq_print:
 * @crq: The data to be printed
 * @format: Indicate the format to use
 * @out: Newly allocated datum with null terminated string.
 *
 * This function will pretty print a certificate request, suitable for
 * display to a human.
 *
 * The output @out needs to be deallocated using gnutls_free().
 *
 * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise a
 *   negative error value.
 *
 * Since: 2.8.0
 **/
int
gnutls_x509_crq_print(gnutls_x509_crq_t crq,
          gnutls_certificate_print_formats_t format,
          gnutls_datum_t * out)
{
  gnutls_buffer_st str;

  _gnutls_buffer_init(&str);

  _gnutls_buffer_append_str
      (&str, _("PKCS #10 Certificate Request Information:\n"));

  print_crq(&str, crq, format);

  _gnutls_buffer_append_str(&str, _("Other Information:\n"));

  print_crq_other(&str, crq);

  return _gnutls_buffer_to_datum(&str, out, 1);
}

static void
print_pubkey_other(gnutls_buffer_st * str, gnutls_pubkey_t pubkey,
       gnutls_certificate_print_formats_t format)
{
  int ret;
  unsigned int usage;

  ret = gnutls_pubkey_get_key_usage(pubkey, &usage);
  if (ret < 0) {
    addf(str, "error: get_key_usage: %s\n", gnutls_strerror(ret));
    return;
  }

  adds(str, "\n");
  if (pubkey->key_usage) {
    adds(str, _("Public Key Usage:\n"));
    print_key_usage2(str, "\t", pubkey->key_usage);
  }

  /* on unknown public key algorithms don't print the key ID */
  ret = gnutls_pubkey_get_pk_algorithm(pubkey, NULL);
  if (ret < 0)
    return;

  print_obj_id(str, "", pubkey, (get_id_func *) gnutls_pubkey_get_key_id);
}

/**
 * gnutls_pubkey_print:
 * @pubkey: The data to be printed
 * @format: Indicate the format to use
 * @out: Newly allocated datum with null terminated string.
 *
 * This function will pretty print public key information, suitable for
 * display to a human.
 *
 * Only %GNUTLS_CRT_PRINT_FULL and %GNUTLS_CRT_PRINT_FULL_NUMBERS
 * are implemented.
 *
 * The output @out needs to be deallocated using gnutls_free().
 *
 * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise a
 *   negative error value.
 *
 * Since: 3.1.5
 **/
int
gnutls_pubkey_print(gnutls_pubkey_t pubkey,
        gnutls_certificate_print_formats_t format,
        gnutls_datum_t * out)
{
  gnutls_buffer_st str;

  _gnutls_buffer_init(&str);

  _gnutls_buffer_append_str(&str, _("Public Key Information:\n"));

  print_pubkey(&str, "", pubkey, NULL, format);
  print_pubkey_other(&str, pubkey, format);

  return _gnutls_buffer_to_datum(&str, out, 1);
}

/**
 * gnutls_x509_ext_print:
 * @exts: The data to be printed
 * @exts_size: the number of available structures
 * @format: Indicate the format to use
 * @out: Newly allocated datum with null terminated string.
 *
 * This function will pretty print X.509 certificate extensions,
 * suitable for display to a human.
 *
 * The output @out needs to be deallocated using gnutls_free().
 *
 * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise a
 *   negative error value.
 **/
int
gnutls_x509_ext_print(gnutls_x509_ext_st * exts, unsigned int exts_size,
          gnutls_certificate_print_formats_t format,
          gnutls_datum_t * out)
{
  gnutls_buffer_st str;
  struct ext_indexes_st idx;
  unsigned i;

  memset(&idx, 0, sizeof(idx));
  _gnutls_buffer_init(&str);

  for (i = 0; i < exts_size; i++)
    print_extension(&str, "", &idx, (char *)exts[i].oid,
        exts[i].critical, &exts[i].data);

  return _gnutls_buffer_to_datum(&str, out, 1);
}

Coverage Report

Created: 2023-03-26 07:33