/*      $OpenBSD: x509test.c,v 1.4 2025/11/25 05:21:35 tb Exp $ */
/*      $EOM: x509test.c,v 1.9 2000/12/21 15:24:25 ho Exp $     */

/*
 * Copyright (c) 1998, 1999 Niels Provos.  All rights reserved.
 * Copyright (c) 1999, 2001 Niklas Hallqvist.  All rights reserved.
 * Copyright (c) 2001 Håkan Olsson.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * This code was written under funding by Ericsson Radio Systems.
 */

/*
 * This program takes a certificate generated by ssleay and a key pair
 * from rsakeygen. It reads the IP address from certificate.txt and
 * includes this as subject alt name extension into the certifcate.
 * The result gets written as new certificate that can be used by
 * isakmpd.
 */

#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <ctype.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include "conf.h"
#include "ipsec_num.h"
#include "isakmp_fld.h"
#include "libcrypto.h"
#include "log.h"
#include "x509.h"

static int x509_check_subjectaltname (u_char *, u_int, X509 *);

u_int32_t file_sz;

#if 0
/* XXX Currently unused.  */
static u_int8_t *
open_file (char *name)
{
  int fd;
  struct stat st;
  u_int8_t *addr;

  if (stat (name, &st) == -1)
    log_fatal ("stat (\"%s\", &st)", name);
  file_sz = st.st_size;
  fd = open (name, O_RDONLY);
  if (fd == -1)
    log_fatal ("open (\"%s\", O_RDONLY)", name);
  addr = mmap (0, file_sz, PROT_READ | PROT_WRITE, MAP_FILE | MAP_PRIVATE,
               fd, 0);
  if (addr == MAP_FAILED)
    log_fatal ("mmap (0, %d, PROT_READ | PROT_WRITE, MAP_FILE | MAP_PRIVATE,"
               "%d, 0)", file_sz, fd);
  close (fd);

  return addr;
}
#endif

/*
 * Check that a certificate has a subjectAltName and that it matches our ID.
 */
static int
x509_check_subjectaltname (u_char *id, u_int id_len, X509 *scert)
{
  const u_int8_t *altname;
  u_int32_t altlen;
  int type, idtype, ret;

  type = x509_cert_subjectaltname (scert, &altname, &altlen);
  if (!type)
    {
      log_print ("x509_check_subjectaltname: can't access subjectAltName");
      return 0;
    }

  /*
   * Now that we have the X509 certicate in native form, get the
   * subjectAltName extension and verify that it matches our ID.
   */

  /* XXX Get type of ID.  */
  idtype = id[0];
  id += ISAKMP_ID_DATA_OFF - ISAKMP_GEN_SZ;
  id_len -= ISAKMP_ID_DATA_OFF - ISAKMP_GEN_SZ;

  ret = 0;
  switch (idtype)
    {
    case IPSEC_ID_IPV4_ADDR:
      if (type == X509v3_IP_ADDR)
        ret = 1;
      break;
    case IPSEC_ID_FQDN:
      if (type == X509v3_DNS_NAME)
        ret = 1;
      break;
    case IPSEC_ID_USER_FQDN:
      if (type == X509v3_RFC_NAME)
        ret = 1;
      break;
    default:
      ret = 0;
      break;
    }

  if (!ret)
    {
      LOG_DBG ((LOG_CRYPTO, 50,
                "x509_check_subjectaltname: "
                "our ID type (%d) does not match X509 cert ID type (%d)",
                idtype, type));
      return 0;
    }

  if (altlen != id_len || memcmp (altname, id, id_len) != 0)
    {
      LOG_DBG ((LOG_CRYPTO, 50,
                "x509_check_subjectaltname: "
                "our ID does not match X509 cert ID"));
      return 0;
    }

  return 1;
}

int
main (int argc, char *argv[])
{
  RSA *pub_key, *priv_key;
  X509 *cert;
  BIO *certfile, *keyfile;
  EVP_PKEY *pkey_pub;
  u_char ipaddr[6];
  struct in_addr saddr;
  char enc[256], dec[256];
  u_int8_t idpayload[8];
  int err, len;

  if (argc < 3 || argc > 4)
    {
      fprintf (stderr, "usage: x509test private-key certificate ip-address\n");
      exit (1);
    }

  /*
   * X509_verify will fail, as will all other functions that call
   * EVP_get_digest_byname.
   */

  printf ("Reading private key %s\n", argv[1]);
  keyfile = BIO_new (BIO_s_file ());
  if (BIO_read_filename (keyfile, argv[1]) == -1)
    {
      perror ("read");
      exit (1);
    }
#if SSLEAY_VERSION_NUMBER >= 0x00904100L
  priv_key = PEM_read_bio_RSAPrivateKey (keyfile, NULL, NULL, NULL);
#else
  priv_key = PEM_read_bio_RSAPrivateKey (keyfile, NULL, NULL);
#endif
  BIO_free (keyfile);
  if (priv_key == NULL)
    {
      printf("PEM_read_bio_RSAPrivateKey () failed\n");
      exit (1);
    }

  /* Use a certificate created by ssleay.  */
  printf ("Reading ssleay created certificate %s\n", argv[2]);
  certfile = BIO_new (BIO_s_file ());
  if (BIO_read_filename (certfile, argv[2]) == -1)
    {
      perror ("read");
      exit (1);
    }
#if SSLEAY_VERSION_NUMBER >= 0x00904100L
  cert = PEM_read_bio_X509 (certfile, NULL, NULL, NULL);
#else
  cert = PEM_read_bio_X509 (certfile, NULL, NULL);
#endif
  BIO_free (certfile);
  if (cert == NULL)
    {
      printf("PEM_read_bio_X509 () failed\n");
      exit (1);
    }

  pkey_pub = X509_get_pubkey (cert);
  pub_key = EVP_PKEY_get0_RSA (pkey_pub);
  if (pub_key == NULL)
    {
      exit (1);
    }

  printf ("Testing RSA keys: ");

  err = 0;
  strlcpy (dec, "Eine kleine Testmeldung", 256);
  if ((len = RSA_private_encrypt (strlen (dec), dec, enc, priv_key,
                                  RSA_PKCS1_PADDING)) == -1)

    printf ("SIGN FAILED ");
  else
    err = RSA_public_decrypt (len, enc, dec, pub_key, RSA_PKCS1_PADDING);

  if (err == -1 || strcmp (dec, "Eine kleine Testmeldung"))
    printf ("SIGN/VERIFY FAILED");
  else
    printf ("OKAY");
  printf ("\n");


  printf ("Validate SIGNED: ");
  err = X509_verify (cert, pkey_pub);
  printf ("X509 verify: %d ", err);
  if (err == -1)
    printf ("FAILED ");
  else
    printf ("OKAY ");
  printf ("\n");

  if (argc == 4)
    {
      printf ("Verifying extension: ");
      if (inet_aton (argv[3], &saddr) == 0)
        {
          printf ("inet_aton () failed\n");
          exit (1);
        }

      saddr.s_addr = htonl (saddr.s_addr);
      ipaddr[0] = 0x87;
      ipaddr[1] = 0x04;
      ipaddr[2] = saddr.s_addr >> 24;
      ipaddr[3] = (saddr.s_addr >> 16) & 0xff;
      ipaddr[4] = (saddr.s_addr >> 8) & 0xff;
      ipaddr[5] = saddr.s_addr & 0xff;
      bzero (idpayload, sizeof idpayload);
      idpayload[0] = IPSEC_ID_IPV4_ADDR;
      bcopy (ipaddr + 2, idpayload + 4, 4);

      if (!x509_check_subjectaltname (idpayload, sizeof idpayload, cert))
        printf("FAILED ");
      else
        printf("OKAY ");
      printf ("\n");
    }

  return 1;
}