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

   1 /*
   2  * Testing tool for EAPOL-Key Authenticator routines
   3  * Copyright (c) 2006-2019, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "utils/includes.h"
  10
  11 #include "utils/common.h"
  12 #include "utils/eloop.h"
  13 #include "ap/wpa_auth.h"
  14 #include "../fuzzer-common.h"
  15
  16
  17 struct wpa {
  18         const u8 *data;
  19         size_t data_len;
  20         size_t data_offset;
  21         int wpa1;
  22
  23         u8 auth_addr[ETH_ALEN];
  24         u8 supp_addr[ETH_ALEN];
  25         u8 psk[PMK_LEN];
  26
  27         /* from supplicant */
  28         u8 *supp_eapol;
  29         size_t supp_eapol_len;
  30
  31         struct wpa_auth_callbacks auth_cb;
  32         struct wpa_authenticator *auth_group;
  33         struct wpa_state_machine *auth;
  34
  35         u8 supp_ie[80];
  36         size_t supp_ie_len;
  37
  38         int key_request_done;
  39         int key_request_done1;
  40         int auth_sent;
  41 };
  42
  43
  44 const struct wpa_driver_ops *const wpa_drivers[] = { NULL };
  45
  46
  47 static int auth_read_msg(struct wpa *wpa);
  48 static void supp_eapol_key_request(void *eloop_data, void *user_ctx);
  49
  50
  51 static u8 * read_msg(struct wpa *wpa, size_t *ret_len)
  52 {
  53         u16 msg_len;
  54         u8 *msg;
  55
  56         if (wpa->data_len - wpa->data_offset < 2) {
  57                 wpa_printf(MSG_ERROR, "TEST-ERROR: Could not read msg len");
  58                 eloop_terminate();
  59                 return NULL;
  60         }
  61         msg_len = WPA_GET_BE16(&wpa->data[wpa->data_offset]);
  62         wpa->data_offset += 2;
  63
  64         msg = os_malloc(msg_len);
  65         if (!msg)
  66                 return NULL;
  67         if (msg_len > 0 && wpa->data_len - wpa->data_offset < msg_len) {
  68                 wpa_printf(MSG_ERROR, "TEST-ERROR: Truncated msg (msg_len=%u)",
  69                            msg_len);
  70                 os_free(msg);
  71                 eloop_terminate();
  72                 return NULL;
  73         }
  74         os_memcpy(msg, &wpa->data[wpa->data_offset], msg_len);
  75         wpa->data_offset += msg_len;
  76         wpa_hexdump(MSG_DEBUG, "TEST: Read message from file", msg, msg_len);
  77
  78         *ret_len = msg_len;
  79         return msg;
  80 }
  81
  82
  83 static void auth_eapol_rx(void *eloop_data, void *user_ctx)
  84 {
  85         struct wpa *wpa = eloop_data;
  86
  87         wpa_printf(MSG_DEBUG, "AUTH: RX EAPOL frame");
  88         wpa->auth_sent = 0;
  89         wpa_receive(wpa->auth_group, wpa->auth, wpa->supp_eapol,
  90                     wpa->supp_eapol_len);
  91         if (!wpa->auth_sent) {
  92                 /* Speed up process by not going through retransmit timeout */
  93                 wpa_printf(MSG_DEBUG,
  94                            "AUTH: No response was sent - process next message");
  95                 auth_read_msg(wpa);
  96         }
  97         if (wpa->wpa1 && wpa->key_request_done && !wpa->key_request_done1) {
  98                 wpa->key_request_done1 = 1;
  99                 eloop_register_timeout(0, 0, supp_eapol_key_request,
 100                                        wpa, NULL);
 101         }
 102
 103 }
 104
 105
 106 static void auth_logger(void *ctx, const u8 *addr, logger_level level,
 107                         const char *txt)
 108 {
 109         if (addr)
 110                 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s",
 111                            MAC2STR(addr), txt);
 112         else
 113                 wpa_printf(MSG_DEBUG, "AUTH: %s", txt);
 114 }
 115
 116
 117 static int auth_read_msg(struct wpa *wpa)
 118 {
 119         os_free(wpa->supp_eapol);
 120         wpa->supp_eapol = read_msg(wpa, &wpa->supp_eapol_len);
 121         if (!wpa->supp_eapol)
 122                 return -1;
 123         eloop_register_timeout(0, 0, auth_eapol_rx, wpa, NULL);
 124         return 0;
 125 }
 126
 127
 128 static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data,
 129                            size_t data_len, int encrypt)
 130 {
 131         struct wpa *wpa = ctx;
 132
 133         wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu "
 134                    "encrypt=%d)",
 135                    __func__, MAC2STR(addr), (unsigned long) data_len, encrypt);
 136         wpa->auth_sent = 1;
 137
 138         return auth_read_msg(wpa);
 139 }
 140
 141
 142 static const u8 * auth_get_psk(void *ctx, const u8 *addr,
 143                                const u8 *p2p_dev_addr, const u8 *prev_psk,
 144                                size_t *psk_len, int *vlan_id)
 145 {
 146         struct wpa *wpa = ctx;
 147
 148         wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
 149                    __func__, MAC2STR(addr), prev_psk);
 150         if (vlan_id)
 151                 *vlan_id = 0;
 152         if (psk_len)
 153                 *psk_len = PMK_LEN;
 154         if (prev_psk)
 155                 return NULL;
 156         return wpa->psk;
 157 }
 158
 159
 160 static void supp_eapol_key_request(void *eloop_data, void *user_ctx)
 161 {
 162         struct wpa *wpa = eloop_data;
 163
 164         wpa_printf(MSG_DEBUG, "SUPP: EAPOL-Key Request trigger");
 165         if (!eloop_is_timeout_registered(auth_eapol_rx, wpa, NULL))
 166                 auth_read_msg(wpa);
 167 }
 168
 169
 170 static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
 171                         const u8 *addr, int idx, u8 *key,
 172                         size_t key_len)
 173 {
 174         struct wpa *wpa = ctx;
 175
 176         wpa_printf(MSG_DEBUG, "AUTH: %s (vlan_id=%d alg=%d idx=%d key_len=%d)",
 177                    __func__, vlan_id, alg, idx, (int) key_len);
 178         if (addr)
 179                 wpa_printf(MSG_DEBUG, "AUTH: addr=" MACSTR, MAC2STR(addr));
 180
 181         if (alg != WPA_ALG_NONE && idx == 0 && key_len > 0 &&
 182             !wpa->key_request_done) {
 183                 wpa_printf(MSG_DEBUG, "Test EAPOL-Key Request");
 184                 wpa->key_request_done = 1;
 185                 if (!wpa->wpa1)
 186                         eloop_register_timeout(0, 0, supp_eapol_key_request,
 187                                                wpa, NULL);
 188         }
 189
 190         return 0;
 191 }
 192
 193
 194 static int auth_init_group(struct wpa *wpa)
 195 {
 196         struct wpa_auth_config conf;
 197
 198         wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
 199
 200         os_memset(&conf, 0, sizeof(conf));
 201         if (wpa->wpa1) {
 202                 conf.wpa = 1;
 203                 conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
 204                 conf.wpa_pairwise = WPA_CIPHER_TKIP;
 205                 conf.wpa_group = WPA_CIPHER_TKIP;
 206         } else {
 207                 conf.wpa = 2;
 208                 conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
 209                 conf.wpa_pairwise = WPA_CIPHER_CCMP;
 210                 conf.rsn_pairwise = WPA_CIPHER_CCMP;
 211                 conf.wpa_group = WPA_CIPHER_CCMP;
 212                 conf.ieee80211w = 2;
 213                 conf.group_mgmt_cipher = WPA_CIPHER_AES_128_CMAC;
 214         }
 215         conf.eapol_version = 2;
 216         conf.wpa_group_update_count = 4;
 217         conf.wpa_pairwise_update_count = 4;
 218
 219         wpa->auth_cb.logger = auth_logger;
 220         wpa->auth_cb.send_eapol = auth_send_eapol;
 221         wpa->auth_cb.get_psk = auth_get_psk;
 222         wpa->auth_cb.set_key = auth_set_key;
 223
 224         wpa->auth_group = wpa_init(wpa->auth_addr, &conf, &wpa->auth_cb, wpa);
 225         if (!wpa->auth_group) {
 226                 wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
 227                 return -1;
 228         }
 229
 230         return 0;
 231 }
 232
 233
 234 static int auth_init(struct wpa *wpa)
 235 {
 236         const u8 *supp_ie;
 237         size_t supp_ie_len;
 238         static const u8 ie_rsn[] = {
 239                 0x30, 0x14, 0x01, 0x00, 0x00, 0x0f, 0xac, 0x04,
 240                 0x01, 0x00, 0x00, 0x0f, 0xac, 0x04, 0x01, 0x00,
 241                 0x00, 0x0f, 0xac, 0x02, 0x80, 0x00
 242         };
 243         static const u8 ie_wpa[] = {
 244                 0xdd, 0x16, 0x00, 0x50, 0xf2, 0x01, 0x01, 0x00,
 245                 0x00, 0x50, 0xf2, 0x02, 0x01, 0x00, 0x00, 0x50,
 246                 0xf2, 0x02, 0x01, 0x00, 0x00, 0x50, 0xf2, 0x02
 247         };
 248
 249         if (wpa->wpa1) {
 250                 supp_ie = ie_wpa;
 251                 supp_ie_len = sizeof(ie_wpa);
 252         } else {
 253                 supp_ie = ie_rsn;
 254                 supp_ie_len = sizeof(ie_rsn);
 255         }
 256
 257         wpa->auth = wpa_auth_sta_init(wpa->auth_group, wpa->supp_addr, NULL);
 258         if (!wpa->auth) {
 259                 wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed");
 260                 return -1;
 261         }
 262
 263         if (wpa_validate_wpa_ie(wpa->auth_group, wpa->auth, 2412, supp_ie,
 264                                 supp_ie_len, NULL, 0, NULL, 0, NULL, 0) !=
 265             WPA_IE_OK) {
 266                 wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed");
 267                 return -1;
 268         }
 269
 270         wpa_auth_sm_event(wpa->auth, WPA_ASSOC);
 271
 272         wpa_auth_sta_associated(wpa->auth_group, wpa->auth);
 273
 274         return 0;
 275 }
 276
 277
 278 static void deinit(struct wpa *wpa)
 279 {
 280         wpa_auth_sta_deinit(wpa->auth);
 281         wpa_deinit(wpa->auth_group);
 282         os_free(wpa->supp_eapol);
 283         wpa->supp_eapol = NULL;
 284 }
 285
 286
 287 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 288 {
 289         struct wpa wpa;
 290
 291         wpa_fuzzer_set_debug_level();
 292
 293         if (os_program_init())
 294                 return -1;
 295
 296         os_memset(&wpa, 0, sizeof(wpa));
 297         wpa.data = data;
 298         wpa.data_len = size;
 299
 300         os_memset(wpa.auth_addr, 0x12, ETH_ALEN);
 301         os_memset(wpa.supp_addr, 0x32, ETH_ALEN);
 302         os_memset(wpa.psk, 0x44, PMK_LEN);
 303
 304         if (eloop_init()) {
 305                 wpa_printf(MSG_ERROR, "Failed to initialize event loop");
 306                 goto fail;
 307         }
 308
 309         if (auth_init_group(&wpa) < 0)
 310                 goto fail;
 311
 312         if (auth_init(&wpa) < 0)
 313                 goto fail;
 314
 315         wpa_printf(MSG_DEBUG, "Starting eloop");
 316         eloop_run();
 317         wpa_printf(MSG_DEBUG, "eloop done");
 318
 319 fail:
 320         deinit(&wpa);
 321
 322         eloop_destroy();
 323
 324         os_program_deinit();
 325
 326         return 0;
 327 }