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
read_msg(struct wpa * wpa,size_t * ret_len)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
auth_eapol_rx(void * eloop_data,void * user_ctx)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
auth_logger(void * ctx,const u8 * addr,logger_level level,const char * txt)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
auth_read_msg(struct wpa * wpa)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
auth_send_eapol(void * ctx,const u8 * addr,const u8 * data,size_t data_len,int encrypt)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
auth_get_psk(void * ctx,const u8 * addr,const u8 * p2p_dev_addr,const u8 * prev_psk,size_t * psk_len,int * vlan_id)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
supp_eapol_key_request(void * eloop_data,void * user_ctx)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
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)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, enum key_flag key_flag)
173 {
174 struct wpa *wpa = ctx;
175
176 wpa_printf(MSG_DEBUG,
177 "AUTH: %s (vlan_id=%d alg=%d idx=%d key_len=%d key_flag=0x%x)",
178 __func__, vlan_id, alg, idx, (int) key_len, key_flag);
179 if (addr)
180 wpa_printf(MSG_DEBUG, "AUTH: addr=" MACSTR, MAC2STR(addr));
181
182 if (alg != WPA_ALG_NONE && idx == 0 && key_len > 0 &&
183 !wpa->key_request_done) {
184 wpa_printf(MSG_DEBUG, "Test EAPOL-Key Request");
185 wpa->key_request_done = 1;
186 if (!wpa->wpa1)
187 eloop_register_timeout(0, 0, supp_eapol_key_request,
188 wpa, NULL);
189 }
190
191 return 0;
192 }
193
194
auth_init_group(struct wpa * wpa)195 static int auth_init_group(struct wpa *wpa)
196 {
197 struct wpa_auth_config conf;
198
199 wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
200
201 os_memset(&conf, 0, sizeof(conf));
202 if (wpa->wpa1) {
203 conf.wpa = 1;
204 conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
205 conf.wpa_pairwise = WPA_CIPHER_TKIP;
206 conf.wpa_group = WPA_CIPHER_TKIP;
207 } else {
208 conf.wpa = 2;
209 conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
210 conf.wpa_pairwise = WPA_CIPHER_CCMP;
211 conf.rsn_pairwise = WPA_CIPHER_CCMP;
212 conf.wpa_group = WPA_CIPHER_CCMP;
213 conf.ieee80211w = 2;
214 conf.group_mgmt_cipher = WPA_CIPHER_AES_128_CMAC;
215 }
216 conf.eapol_version = 2;
217 conf.wpa_group_update_count = 4;
218 conf.wpa_pairwise_update_count = 4;
219
220 wpa->auth_cb.logger = auth_logger;
221 wpa->auth_cb.send_eapol = auth_send_eapol;
222 wpa->auth_cb.get_psk = auth_get_psk;
223 wpa->auth_cb.set_key = auth_set_key;
224
225 wpa->auth_group = wpa_init(wpa->auth_addr, &conf, &wpa->auth_cb, wpa);
226 if (!wpa->auth_group) {
227 wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
228 return -1;
229 }
230
231 return 0;
232 }
233
234
auth_init(struct wpa * wpa)235 static int auth_init(struct wpa *wpa)
236 {
237 const u8 *supp_ie;
238 size_t supp_ie_len;
239 static const u8 ie_rsn[] = {
240 0x30, 0x14, 0x01, 0x00, 0x00, 0x0f, 0xac, 0x04,
241 0x01, 0x00, 0x00, 0x0f, 0xac, 0x04, 0x01, 0x00,
242 0x00, 0x0f, 0xac, 0x02, 0x80, 0x00
243 };
244 static const u8 ie_wpa[] = {
245 0xdd, 0x16, 0x00, 0x50, 0xf2, 0x01, 0x01, 0x00,
246 0x00, 0x50, 0xf2, 0x02, 0x01, 0x00, 0x00, 0x50,
247 0xf2, 0x02, 0x01, 0x00, 0x00, 0x50, 0xf2, 0x02
248 };
249
250 if (wpa->wpa1) {
251 supp_ie = ie_wpa;
252 supp_ie_len = sizeof(ie_wpa);
253 } else {
254 supp_ie = ie_rsn;
255 supp_ie_len = sizeof(ie_rsn);
256 }
257
258 wpa->auth = wpa_auth_sta_init(wpa->auth_group, wpa->supp_addr, NULL);
259 if (!wpa->auth) {
260 wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed");
261 return -1;
262 }
263
264 if (wpa_validate_wpa_ie(wpa->auth_group, wpa->auth, 2412, supp_ie,
265 supp_ie_len, NULL, 0, NULL, 0, NULL, 0, NULL,
266 false) != WPA_IE_OK) {
267 wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed");
268 return -1;
269 }
270
271 wpa_auth_sm_event(wpa->auth, WPA_ASSOC);
272
273 wpa_auth_sta_associated(wpa->auth_group, wpa->auth);
274
275 return 0;
276 }
277
278
deinit(struct wpa * wpa)279 static void deinit(struct wpa *wpa)
280 {
281 wpa_auth_sta_deinit(wpa->auth);
282 wpa_deinit(wpa->auth_group);
283 os_free(wpa->supp_eapol);
284 wpa->supp_eapol = NULL;
285 }
286
287
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)288 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
289 {
290 struct wpa wpa;
291
292 wpa_fuzzer_set_debug_level();
293
294 if (os_program_init())
295 return -1;
296
297 os_memset(&wpa, 0, sizeof(wpa));
298 wpa.data = data;
299 wpa.data_len = size;
300
301 os_memset(wpa.auth_addr, 0x12, ETH_ALEN);
302 os_memset(wpa.supp_addr, 0x32, ETH_ALEN);
303 os_memset(wpa.psk, 0x44, PMK_LEN);
304
305 if (eloop_init()) {
306 wpa_printf(MSG_ERROR, "Failed to initialize event loop");
307 goto fail;
308 }
309
310 if (auth_init_group(&wpa) < 0)
311 goto fail;
312
313 if (auth_init(&wpa) < 0)
314 goto fail;
315
316 wpa_printf(MSG_DEBUG, "Starting eloop");
317 eloop_run();
318 wpa_printf(MSG_DEBUG, "eloop done");
319
320 fail:
321 deinit(&wpa);
322
323 eloop_destroy();
324
325 os_program_deinit();
326
327 return 0;
328 }
329