hostap/tests/fuzzing/eapol-key-auth/eapol-key-auth.c

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/*
* 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)
{
struct wpa *wpa = ctx;
wpa_printf(MSG_DEBUG, "AUTH: %s (vlan_id=%d alg=%d idx=%d key_len=%d)",
__func__, vlan_id, alg, idx, (int) key_len);
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) != 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;
}