/*

 * Copyright (C) 2017 Nikos Mavrogiannopoulos

 * Copyright (C) 2019 Tom Vrancken (dev@tomvrancken.nl)

 *

 * 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.

 *

 */

/***

 * This fuzzer tests the behavior of the GnuTLS library in server mode,

 * specifically dealing with raw public keys during the handshake.

 * 

 * The fuzzer corpus generated as first input was generated with the

 * following parameters for gnutls-serv and gnutls-cli:

 * 

 * gnutls-serv --priority NORMAL:+CTYPE-CLI-RAWPK:+CTYPE-SRV-RAWPK

 * gnutls-cli localhost:5556 --priority NORMAL:-CTYPE-ALL:+CTYPE-CLI-RAWPK:+CTYPE-SRV-RAWPK --no-ca-verification

 * 

 * The above yields a handshake where both the client and server present

 * a raw public-key to each other.

 */

#include <assert.h>

#include <stdint.h>

#include <unistd.h>

#include <string.h>

#include <stdlib.h>

#include <gnutls/gnutls.h>

#include "certs.h"

#include "mem.h"

#include "fuzzer.h"

int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)

{

  IGNORE_CERTS;

  int res;

  gnutls_session_t session;

  gnutls_certificate_credentials_t rawpk_cred;

  struct mem_st memdata;

  res = gnutls_init(&session, GNUTLS_SERVER | GNUTLS_ENABLE_RAWPK);

  assert(res >= 0);

  res = gnutls_certificate_allocate_credentials(&rawpk_cred);

  assert(res >= 0);

  res = gnutls_certificate_set_rawpk_key_mem(

    rawpk_cred, &rawpk_public_key1, &rawpk_private_key1,

    GNUTLS_X509_FMT_PEM, NULL, 0, NULL, 0, 0);

  assert(res >= 0);

  gnutls_certificate_set_known_dh_params(rawpk_cred,

                 GNUTLS_SEC_PARAM_MEDIUM);

  res = gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,

             rawpk_cred);

  assert(res >= 0);

  res = gnutls_priority_set_direct(

    session,

    "NORMAL:" VERS_STR

    ":-CTYPE-ALL:+CTYPE-CLI-RAWPK:+CTYPE-SRV-RAWPK",

    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(rawpk_cred);

  return 0;

}