/*

 * Copyright (C) 2017 Nikos Mavrogiannopoulos

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

 * DEALINGS IN THE SOFTWARE.

 *

 */

#include <assert.h>

#include <stdint.h>

#include <unistd.h>

#include <string.h>

#include <stdlib.h>

#include <gnutls/gnutls.h>

#include "certs.h"

#include "srp.h"

#include "mem.h"

#include "fuzzer.h"

static int srp_cb(gnutls_session_t session, const char *username,

      gnutls_datum_t *salt, gnutls_datum_t *verifier,

      gnutls_datum_t *generator, gnutls_datum_t *prime)

{

  int ret;

  salt->data = (unsigned char *)gnutls_malloc(SALT_SIZE);

  if (salt->data == NULL)

    return -1;

  memcpy(salt->data, (unsigned char *)SALT, SALT_SIZE);

  salt->size = SALT_SIZE;

  generator->data = (unsigned char *)gnutls_malloc(

    gnutls_srp_1024_group_generator.size);

  if (generator->data == NULL)

    return -1;

  memcpy(generator->data, gnutls_srp_1024_group_generator.data,

         gnutls_srp_1024_group_generator.size);

  generator->size = gnutls_srp_1024_group_generator.size;

  prime->data = (unsigned char *)gnutls_malloc(

    gnutls_srp_1024_group_prime.size);

  if (prime->data == NULL)

    return -1;

  memcpy(prime->data, gnutls_srp_1024_group_prime.data,

         gnutls_srp_1024_group_prime.size);

  prime->size = gnutls_srp_1024_group_prime.size;

  ret = gnutls_srp_verifier(USERNAME, PASSWORD, salt, generator, prime,

          verifier);

  if (ret < 0)

    return -1;

  return 0;

}

int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)

{

  IGNORE_CERTS;

  int res;

  gnutls_datum_t rsa_cert, rsa_key;

  gnutls_datum_t ecdsa_cert, ecdsa_key;

  gnutls_datum_t ed25519_cert, ed25519_key;

  gnutls_session_t session;

  gnutls_certificate_credentials_t xcred;

  gnutls_srp_server_credentials_t pcred;

  struct mem_st memdata;

  res = gnutls_init(&session, GNUTLS_SERVER);

  assert(res >= 0);

  res = gnutls_certificate_allocate_credentials(&xcred);

  assert(res >= 0);

  res = gnutls_srp_allocate_server_credentials(&pcred);

  assert(res >= 0);

  gnutls_srp_set_server_credentials_function(pcred, srp_cb);

  rsa_cert.data = (unsigned char *)kRSACertificateDER;

  rsa_cert.size = sizeof(kRSACertificateDER);

  rsa_key.data = (unsigned char *)kRSAPrivateKeyDER;

  rsa_key.size = sizeof(kRSAPrivateKeyDER);

  ecdsa_cert.data = (unsigned char *)kECDSACertificateDER;

  ecdsa_cert.size = sizeof(kECDSACertificateDER);

  ecdsa_key.data = (unsigned char *)kECDSAPrivateKeyDER;

  ecdsa_key.size = sizeof(kECDSAPrivateKeyDER);

  ed25519_cert.data = (unsigned char *)kEd25519CertificateDER;

  ed25519_cert.size = sizeof(kEd25519CertificateDER);

  ed25519_key.data = (unsigned char *)kEd25519PrivateKeyDER;

  ed25519_key.size = sizeof(kEd25519PrivateKeyDER);

  res = gnutls_certificate_set_x509_key_mem(xcred, &rsa_cert, &rsa_key,

              GNUTLS_X509_FMT_DER);

  assert(res >= 0);

  res = gnutls_certificate_set_x509_key_mem(

    xcred, &ecdsa_cert, &ecdsa_key, GNUTLS_X509_FMT_DER);

  assert(res >= 0);

  res = gnutls_certificate_set_x509_key_mem(

    xcred, &ed25519_cert, &ed25519_key, GNUTLS_X509_FMT_DER);

  assert(res >= 0);

  gnutls_certificate_set_known_dh_params(xcred, GNUTLS_SEC_PARAM_MEDIUM);

  res = gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, xcred);

  assert(res >= 0);

  res = gnutls_credentials_set(session, GNUTLS_CRD_SRP, pcred);

  assert(res >= 0);

  res = gnutls_priority_set_direct(

    session, "NORMAL:-KX-ALL:+SRP:+SRP-RSA:+SRP-DSS", NULL);

  assert(res >= 0);

  memdata.data = data;

  memdata.size = size;

  gnutls_transport_set_push_function(session, mem_push);

  gnutls_transport_set_pull_function(session, mem_pull);

  gnutls_transport_set_pull_timeout_function(session, mem_pull_timeout);

  gnutls_transport_set_ptr(session, &memdata);

  do {

    res = gnutls_handshake(session);

  } while (res < 0 && gnutls_error_is_fatal(res) == 0);

  if (res >= 0) {

    for (;;) {

      char buf[16384];

      res = gnutls_record_recv(session, buf, sizeof(buf));

      if (res <= 0) {

        break;

      }

    }

  }

  gnutls_deinit(session);

  gnutls_certificate_free_credentials(xcred);

  gnutls_srp_free_server_credentials(pcred);

  return 0;

}