/*

 * Testing tool for EAPOL-Key Authenticator routines

 * Copyright (c) 2006-2019, Jouni Malinen <j@w1.fi>

 *

 * This software may be distributed under the terms of the BSD license.

 * See README for more details.

 */

#include "utils/includes.h"

#include "utils/common.h"

#include "utils/eloop.h"

#include "ap/wpa_auth.h"

#include "../fuzzer-common.h"

struct wpa {

  const u8 *data;

  size_t data_len;

  size_t data_offset;

  int wpa1;

  u8 auth_addr[ETH_ALEN];

  u8 supp_addr[ETH_ALEN];

  u8 psk[PMK_LEN];

  /* from supplicant */

  u8 *supp_eapol;

  size_t supp_eapol_len;

  struct wpa_auth_callbacks auth_cb;

  struct wpa_authenticator *auth_group;

  struct wpa_state_machine *auth;

  u8 supp_ie[80];

  size_t supp_ie_len;

  int key_request_done;

  int key_request_done1;

  int auth_sent;

};

const struct wpa_driver_ops *const wpa_drivers[] = { NULL };

static int auth_read_msg(struct wpa *wpa);

static void supp_eapol_key_request(void *eloop_data, void *user_ctx);

static u8 * read_msg(struct wpa *wpa, size_t *ret_len)

{

  u16 msg_len;

  u8 *msg;

  if (wpa->data_len - wpa->data_offset < 2) {

    wpa_printf(MSG_ERROR, "TEST-ERROR: Could not read msg len");

    eloop_terminate();

    return NULL;

  }

  msg_len = WPA_GET_BE16(&wpa->data[wpa->data_offset]);

  wpa->data_offset += 2;

  msg = os_malloc(msg_len);

  if (!msg)

    return NULL;

  if (msg_len > 0 && wpa->data_len - wpa->data_offset < msg_len) {

    wpa_printf(MSG_ERROR, "TEST-ERROR: Truncated msg (msg_len=%u)",

         msg_len);

    os_free(msg);

    eloop_terminate();

    return NULL;

  }

  os_memcpy(msg, &wpa->data[wpa->data_offset], msg_len);

  wpa->data_offset += msg_len;

  wpa_hexdump(MSG_DEBUG, "TEST: Read message from file", msg, msg_len);

  *ret_len = msg_len;

  return msg;

}

static void auth_eapol_rx(void *eloop_data, void *user_ctx)

{

  struct wpa *wpa = eloop_data;

  wpa_printf(MSG_DEBUG, "AUTH: RX EAPOL frame");

  wpa->auth_sent = 0;

  wpa_receive(wpa->auth_group, wpa->auth, wpa->supp_eapol,

        wpa->supp_eapol_len);

  if (!wpa->auth_sent) {

    /* Speed up process by not going through retransmit timeout */

    wpa_printf(MSG_DEBUG,

         "AUTH: No response was sent - process next message");

    auth_read_msg(wpa);

  }

  if (wpa->wpa1 && wpa->key_request_done && !wpa->key_request_done1) {

    wpa->key_request_done1 = 1;

    eloop_register_timeout(0, 0, supp_eapol_key_request,

               wpa, NULL);

  }

}

static void auth_logger(void *ctx, const u8 *addr, logger_level level,

      const char *txt)

{

  if (addr)

    wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s",

         MAC2STR(addr), txt);

  else

    wpa_printf(MSG_DEBUG, "AUTH: %s", txt);

}

static int auth_read_msg(struct wpa *wpa)

{

  os_free(wpa->supp_eapol);

  wpa->supp_eapol = read_msg(wpa, &wpa->supp_eapol_len);

  if (!wpa->supp_eapol)

    return -1;

  eloop_register_timeout(0, 0, auth_eapol_rx, wpa, NULL);

  return 0;

}

static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data,

         size_t data_len, int encrypt)

{

  struct wpa *wpa = ctx;

  wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu "

       "encrypt=%d)",

       __func__, MAC2STR(addr), (unsigned long) data_len, encrypt);

  wpa->auth_sent = 1;

  return auth_read_msg(wpa);

}

static const u8 * auth_get_psk(void *ctx, const u8 *addr,

             const u8 *p2p_dev_addr, const u8 *prev_psk,

             size_t *psk_len, int *vlan_id)

{

  struct wpa *wpa = ctx;

  wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",

       __func__, MAC2STR(addr), prev_psk);

  if (vlan_id)

    *vlan_id = 0;

  if (psk_len)

    *psk_len = PMK_LEN;

  if (prev_psk)

    return NULL;

  return wpa->psk;

}

static void supp_eapol_key_request(void *eloop_data, void *user_ctx)

{

  struct wpa *wpa = eloop_data;

  wpa_printf(MSG_DEBUG, "SUPP: EAPOL-Key Request trigger");

  if (!eloop_is_timeout_registered(auth_eapol_rx, wpa, NULL))

    auth_read_msg(wpa);

}

static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,

      const u8 *addr, int idx, u8 *key,

      size_t key_len, enum key_flag key_flag)

{

  struct wpa *wpa = ctx;

  wpa_printf(MSG_DEBUG,

       "AUTH: %s (vlan_id=%d alg=%d idx=%d key_len=%d key_flag=0x%x)",

       __func__, vlan_id, alg, idx, (int) key_len, key_flag);

  if (addr)

    wpa_printf(MSG_DEBUG, "AUTH: addr=" MACSTR, MAC2STR(addr));

  if (alg != WPA_ALG_NONE && idx == 0 && key_len > 0 &&

      !wpa->key_request_done) {

    wpa_printf(MSG_DEBUG, "Test EAPOL-Key Request");

    wpa->key_request_done = 1;

    if (!wpa->wpa1)

      eloop_register_timeout(0, 0, supp_eapol_key_request,

                 wpa, NULL);

  }

  return 0;

}

static int auth_init_group(struct wpa *wpa)

{

  struct wpa_auth_config conf;

  wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");

  os_memset(&conf, 0, sizeof(conf));

  if (wpa->wpa1) {

    conf.wpa = 1;

    conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;

    conf.wpa_pairwise = WPA_CIPHER_TKIP;

    conf.wpa_group = WPA_CIPHER_TKIP;

  } else {

    conf.wpa = 2;

    conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;

    conf.wpa_pairwise = WPA_CIPHER_CCMP;

    conf.rsn_pairwise = WPA_CIPHER_CCMP;

    conf.wpa_group = WPA_CIPHER_CCMP;

    conf.ieee80211w = 2;

    conf.group_mgmt_cipher = WPA_CIPHER_AES_128_CMAC;

  }

  conf.eapol_version = 2;

  conf.wpa_group_update_count = 4;

  conf.wpa_pairwise_update_count = 4;

  wpa->auth_cb.logger = auth_logger;

  wpa->auth_cb.send_eapol = auth_send_eapol;

  wpa->auth_cb.get_psk = auth_get_psk;

  wpa->auth_cb.set_key = auth_set_key;

  wpa->auth_group = wpa_init(wpa->auth_addr, &conf, &wpa->auth_cb, wpa);

  if (!wpa->auth_group) {

    wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");

    return -1;

  }

  return 0;

}

static int auth_init(struct wpa *wpa)

{

  const u8 *supp_ie;

  size_t supp_ie_len;

  static const u8 ie_rsn[] = {

    0x30, 0x14, 0x01, 0x00, 0x00, 0x0f, 0xac, 0x04,

    0x01, 0x00, 0x00, 0x0f, 0xac, 0x04, 0x01, 0x00,

    0x00, 0x0f, 0xac, 0x02, 0x80, 0x00

  };

  static const u8 ie_wpa[] = {

    0xdd, 0x16, 0x00, 0x50, 0xf2, 0x01, 0x01, 0x00,

    0x00, 0x50, 0xf2, 0x02, 0x01, 0x00, 0x00, 0x50,

    0xf2, 0x02, 0x01, 0x00, 0x00, 0x50, 0xf2, 0x02

  };

  if (wpa->wpa1) {

    supp_ie = ie_wpa;

    supp_ie_len = sizeof(ie_wpa);

  } else {

    supp_ie = ie_rsn;

    supp_ie_len = sizeof(ie_rsn);

  }

  wpa->auth = wpa_auth_sta_init(wpa->auth_group, wpa->supp_addr, NULL);

  if (!wpa->auth) {

    wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed");

    return -1;

  }

  if (wpa_validate_wpa_ie(wpa->auth_group, wpa->auth, 2412, supp_ie,

        supp_ie_len, NULL, 0, NULL, 0, NULL, 0, NULL,

        false) != WPA_IE_OK) {

    wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed");

    return -1;

  }

  wpa_auth_sm_event(wpa->auth, WPA_ASSOC);

  wpa_auth_sta_associated(wpa->auth_group, wpa->auth);

  return 0;

}

static void deinit(struct wpa *wpa)

{

  wpa_auth_sta_deinit(wpa->auth);

  wpa_deinit(wpa->auth_group);

  os_free(wpa->supp_eapol);

  wpa->supp_eapol = NULL;

}

int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)

{

  struct wpa wpa;

  wpa_fuzzer_set_debug_level();

  if (os_program_init())

    return -1;

  os_memset(&wpa, 0, sizeof(wpa));

  wpa.data = data;

  wpa.data_len = size;

  os_memset(wpa.auth_addr, 0x12, ETH_ALEN);

  os_memset(wpa.supp_addr, 0x32, ETH_ALEN);

  os_memset(wpa.psk, 0x44, PMK_LEN);

  if (eloop_init()) {

    wpa_printf(MSG_ERROR, "Failed to initialize event loop");

    goto fail;

  }

  if (auth_init_group(&wpa) < 0)

    goto fail;

  if (auth_init(&wpa) < 0)

    goto fail;

  wpa_printf(MSG_DEBUG, "Starting eloop");

  eloop_run();

  wpa_printf(MSG_DEBUG, "eloop done");

fail:

  deinit(&wpa);

  eloop_destroy();

  os_program_deinit();

  return 0;

}