Disconnect hostapd from building in base
[dragonfly.git] / contrib / hostapd / src / wps / wps_attr_build.c
1 /*
2  * Wi-Fi Protected Setup - attribute building
3  * Copyright (c) 2008, 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 "includes.h"
10
11 #include "common.h"
12 #include "crypto/aes_wrap.h"
13 #include "crypto/crypto.h"
14 #include "crypto/dh_group5.h"
15 #include "crypto/sha256.h"
16 #include "crypto/random.h"
17 #include "common/ieee802_11_defs.h"
18 #include "wps_i.h"
19
20
21 int wps_build_public_key(struct wps_data *wps, struct wpabuf *msg)
22 {
23         struct wpabuf *pubkey;
24
25         wpa_printf(MSG_DEBUG, "WPS:  * Public Key");
26         wpabuf_free(wps->dh_privkey);
27         wps->dh_privkey = NULL;
28         if (wps->dev_pw_id != DEV_PW_DEFAULT && wps->wps->dh_privkey &&
29             wps->wps->dh_ctx) {
30                 wpa_printf(MSG_DEBUG, "WPS: Using pre-configured DH keys");
31                 if (wps->wps->dh_pubkey == NULL) {
32                         wpa_printf(MSG_DEBUG,
33                                    "WPS: wps->wps->dh_pubkey == NULL");
34                         return -1;
35                 }
36                 wps->dh_privkey = wpabuf_dup(wps->wps->dh_privkey);
37                 wps->dh_ctx = wps->wps->dh_ctx;
38                 wps->wps->dh_ctx = NULL;
39                 pubkey = wpabuf_dup(wps->wps->dh_pubkey);
40 #ifdef CONFIG_WPS_NFC
41         } else if ((wps->dev_pw_id >= 0x10 ||
42                     wps->dev_pw_id == DEV_PW_NFC_CONNECTION_HANDOVER) &&
43                    (wps->wps->ap ||
44                     (wps->wps->ap_nfc_dh_pubkey &&
45                      wps->wps->ap_nfc_dev_pw_id ==
46                      DEV_PW_NFC_CONNECTION_HANDOVER &&
47                      wps->dev_pw_id == DEV_PW_NFC_CONNECTION_HANDOVER)) &&
48                    (wps->dev_pw_id == wps->wps->ap_nfc_dev_pw_id ||
49                     wps->wps->ap_nfc_dh_pubkey)) {
50                 wpa_printf(MSG_DEBUG, "WPS: Using NFC password token DH keys");
51                 if (wps->wps->ap_nfc_dh_privkey == NULL) {
52                         wpa_printf(MSG_DEBUG,
53                                    "WPS: wps->wps->ap_nfc_dh_privkey == NULL");
54                         return -1;
55                 }
56                 if (wps->wps->ap_nfc_dh_pubkey == NULL) {
57                         wpa_printf(MSG_DEBUG,
58                                    "WPS: wps->wps->ap_nfc_dh_pubkey == NULL");
59                         return -1;
60                 }
61                 wps->dh_privkey = wpabuf_dup(wps->wps->ap_nfc_dh_privkey);
62                 pubkey = wpabuf_dup(wps->wps->ap_nfc_dh_pubkey);
63                 wps->dh_ctx = dh5_init_fixed(wps->dh_privkey, pubkey);
64 #endif /* CONFIG_WPS_NFC */
65         } else {
66                 wpa_printf(MSG_DEBUG, "WPS: Generate new DH keys");
67                 dh5_free(wps->dh_ctx);
68                 wps->dh_ctx = dh5_init(&wps->dh_privkey, &pubkey);
69                 pubkey = wpabuf_zeropad(pubkey, 192);
70         }
71         if (wps->dh_ctx == NULL || wps->dh_privkey == NULL || pubkey == NULL) {
72                 wpa_printf(MSG_DEBUG, "WPS: Failed to initialize "
73                            "Diffie-Hellman handshake");
74                 wpabuf_free(pubkey);
75                 return -1;
76         }
77         wpa_hexdump_buf_key(MSG_DEBUG, "WPS: DH Private Key", wps->dh_privkey);
78         wpa_hexdump_buf(MSG_DEBUG, "WPS: DH own Public Key", pubkey);
79
80         wpabuf_put_be16(msg, ATTR_PUBLIC_KEY);
81         wpabuf_put_be16(msg, wpabuf_len(pubkey));
82         wpabuf_put_buf(msg, pubkey);
83
84         if (wps->registrar) {
85                 wpabuf_free(wps->dh_pubkey_r);
86                 wps->dh_pubkey_r = pubkey;
87         } else {
88                 wpabuf_free(wps->dh_pubkey_e);
89                 wps->dh_pubkey_e = pubkey;
90         }
91
92         return 0;
93 }
94
95
96 int wps_build_req_type(struct wpabuf *msg, enum wps_request_type type)
97 {
98         wpa_printf(MSG_DEBUG, "WPS:  * Request Type");
99         wpabuf_put_be16(msg, ATTR_REQUEST_TYPE);
100         wpabuf_put_be16(msg, 1);
101         wpabuf_put_u8(msg, type);
102         return 0;
103 }
104
105
106 int wps_build_resp_type(struct wpabuf *msg, enum wps_response_type type)
107 {
108         wpa_printf(MSG_DEBUG, "WPS:  * Response Type (%d)", type);
109         wpabuf_put_be16(msg, ATTR_RESPONSE_TYPE);
110         wpabuf_put_be16(msg, 1);
111         wpabuf_put_u8(msg, type);
112         return 0;
113 }
114
115
116 int wps_build_config_methods(struct wpabuf *msg, u16 methods)
117 {
118         wpa_printf(MSG_DEBUG, "WPS:  * Config Methods (%x)", methods);
119         wpabuf_put_be16(msg, ATTR_CONFIG_METHODS);
120         wpabuf_put_be16(msg, 2);
121         wpabuf_put_be16(msg, methods);
122         return 0;
123 }
124
125
126 int wps_build_uuid_e(struct wpabuf *msg, const u8 *uuid)
127 {
128         if (wpabuf_tailroom(msg) < 4 + WPS_UUID_LEN)
129                 return -1;
130         wpa_printf(MSG_DEBUG, "WPS:  * UUID-E");
131         wpabuf_put_be16(msg, ATTR_UUID_E);
132         wpabuf_put_be16(msg, WPS_UUID_LEN);
133         wpabuf_put_data(msg, uuid, WPS_UUID_LEN);
134         return 0;
135 }
136
137
138 int wps_build_dev_password_id(struct wpabuf *msg, u16 id)
139 {
140         wpa_printf(MSG_DEBUG, "WPS:  * Device Password ID (%d)", id);
141         wpabuf_put_be16(msg, ATTR_DEV_PASSWORD_ID);
142         wpabuf_put_be16(msg, 2);
143         wpabuf_put_be16(msg, id);
144         return 0;
145 }
146
147
148 int wps_build_config_error(struct wpabuf *msg, u16 err)
149 {
150         wpa_printf(MSG_DEBUG, "WPS:  * Configuration Error (%d)", err);
151         wpabuf_put_be16(msg, ATTR_CONFIG_ERROR);
152         wpabuf_put_be16(msg, 2);
153         wpabuf_put_be16(msg, err);
154         return 0;
155 }
156
157
158 int wps_build_authenticator(struct wps_data *wps, struct wpabuf *msg)
159 {
160         u8 hash[SHA256_MAC_LEN];
161         const u8 *addr[2];
162         size_t len[2];
163
164         if (wps->last_msg == NULL) {
165                 wpa_printf(MSG_DEBUG, "WPS: Last message not available for "
166                            "building authenticator");
167                 return -1;
168         }
169
170         /* Authenticator = HMAC-SHA256_AuthKey(M_prev || M_curr*)
171          * (M_curr* is M_curr without the Authenticator attribute)
172          */
173         addr[0] = wpabuf_head(wps->last_msg);
174         len[0] = wpabuf_len(wps->last_msg);
175         addr[1] = wpabuf_head(msg);
176         len[1] = wpabuf_len(msg);
177         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 2, addr, len, hash);
178
179         wpa_printf(MSG_DEBUG, "WPS:  * Authenticator");
180         wpabuf_put_be16(msg, ATTR_AUTHENTICATOR);
181         wpabuf_put_be16(msg, WPS_AUTHENTICATOR_LEN);
182         wpabuf_put_data(msg, hash, WPS_AUTHENTICATOR_LEN);
183
184         return 0;
185 }
186
187
188 int wps_build_version(struct wpabuf *msg)
189 {
190         /*
191          * Note: This attribute is deprecated and set to hardcoded 0x10 for
192          * backwards compatibility reasons. The real version negotiation is
193          * done with Version2.
194          */
195         if (wpabuf_tailroom(msg) < 5)
196                 return -1;
197         wpa_printf(MSG_DEBUG, "WPS:  * Version (hardcoded 0x10)");
198         wpabuf_put_be16(msg, ATTR_VERSION);
199         wpabuf_put_be16(msg, 1);
200         wpabuf_put_u8(msg, 0x10);
201         return 0;
202 }
203
204
205 int wps_build_wfa_ext(struct wpabuf *msg, int req_to_enroll,
206                       const u8 *auth_macs, size_t auth_macs_count)
207 {
208 #ifdef CONFIG_WPS2
209         u8 *len;
210
211 #ifdef CONFIG_WPS_TESTING
212         if (WPS_VERSION == 0x10)
213                 return 0;
214 #endif /* CONFIG_WPS_TESTING */
215
216         if (wpabuf_tailroom(msg) <
217             7 + 3 + (req_to_enroll ? 3 : 0) +
218             (auth_macs ? 2 + auth_macs_count * ETH_ALEN : 0))
219                 return -1;
220         wpabuf_put_be16(msg, ATTR_VENDOR_EXT);
221         len = wpabuf_put(msg, 2); /* to be filled */
222         wpabuf_put_be24(msg, WPS_VENDOR_ID_WFA);
223
224         wpa_printf(MSG_DEBUG, "WPS:  * Version2 (0x%x)", WPS_VERSION);
225         wpabuf_put_u8(msg, WFA_ELEM_VERSION2);
226         wpabuf_put_u8(msg, 1);
227         wpabuf_put_u8(msg, WPS_VERSION);
228
229         if (req_to_enroll) {
230                 wpa_printf(MSG_DEBUG, "WPS:  * Request to Enroll (1)");
231                 wpabuf_put_u8(msg, WFA_ELEM_REQUEST_TO_ENROLL);
232                 wpabuf_put_u8(msg, 1);
233                 wpabuf_put_u8(msg, 1);
234         }
235
236         if (auth_macs && auth_macs_count) {
237                 size_t i;
238                 wpa_printf(MSG_DEBUG, "WPS:  * AuthorizedMACs (count=%d)",
239                            (int) auth_macs_count);
240                 wpabuf_put_u8(msg, WFA_ELEM_AUTHORIZEDMACS);
241                 wpabuf_put_u8(msg, auth_macs_count * ETH_ALEN);
242                 wpabuf_put_data(msg, auth_macs, auth_macs_count * ETH_ALEN);
243                 for (i = 0; i < auth_macs_count; i++)
244                         wpa_printf(MSG_DEBUG, "WPS:    AuthorizedMAC: " MACSTR,
245                                    MAC2STR(&auth_macs[i * ETH_ALEN]));
246         }
247
248         WPA_PUT_BE16(len, (u8 *) wpabuf_put(msg, 0) - len - 2);
249 #endif /* CONFIG_WPS2 */
250
251 #ifdef CONFIG_WPS_TESTING
252         if (WPS_VERSION > 0x20) {
253                 if (wpabuf_tailroom(msg) < 5)
254                         return -1;
255                 wpa_printf(MSG_DEBUG, "WPS:  * Extensibility Testing - extra "
256                            "attribute");
257                 wpabuf_put_be16(msg, ATTR_EXTENSIBILITY_TEST);
258                 wpabuf_put_be16(msg, 1);
259                 wpabuf_put_u8(msg, 42);
260         }
261 #endif /* CONFIG_WPS_TESTING */
262         return 0;
263 }
264
265
266 int wps_build_msg_type(struct wpabuf *msg, enum wps_msg_type msg_type)
267 {
268         wpa_printf(MSG_DEBUG, "WPS:  * Message Type (%d)", msg_type);
269         wpabuf_put_be16(msg, ATTR_MSG_TYPE);
270         wpabuf_put_be16(msg, 1);
271         wpabuf_put_u8(msg, msg_type);
272         return 0;
273 }
274
275
276 int wps_build_enrollee_nonce(struct wps_data *wps, struct wpabuf *msg)
277 {
278         wpa_printf(MSG_DEBUG, "WPS:  * Enrollee Nonce");
279         wpabuf_put_be16(msg, ATTR_ENROLLEE_NONCE);
280         wpabuf_put_be16(msg, WPS_NONCE_LEN);
281         wpabuf_put_data(msg, wps->nonce_e, WPS_NONCE_LEN);
282         return 0;
283 }
284
285
286 int wps_build_registrar_nonce(struct wps_data *wps, struct wpabuf *msg)
287 {
288         wpa_printf(MSG_DEBUG, "WPS:  * Registrar Nonce");
289         wpabuf_put_be16(msg, ATTR_REGISTRAR_NONCE);
290         wpabuf_put_be16(msg, WPS_NONCE_LEN);
291         wpabuf_put_data(msg, wps->nonce_r, WPS_NONCE_LEN);
292         return 0;
293 }
294
295
296 int wps_build_auth_type_flags(struct wps_data *wps, struct wpabuf *msg)
297 {
298         u16 auth_types = WPS_AUTH_TYPES;
299 #ifdef CONFIG_WPS2
300         auth_types &= ~WPS_AUTH_SHARED;
301 #endif /* CONFIG_WPS2 */
302         wpa_printf(MSG_DEBUG, "WPS:  * Authentication Type Flags");
303         wpabuf_put_be16(msg, ATTR_AUTH_TYPE_FLAGS);
304         wpabuf_put_be16(msg, 2);
305         wpabuf_put_be16(msg, auth_types);
306         return 0;
307 }
308
309
310 int wps_build_encr_type_flags(struct wps_data *wps, struct wpabuf *msg)
311 {
312         u16 encr_types = WPS_ENCR_TYPES;
313 #ifdef CONFIG_WPS2
314         encr_types &= ~WPS_ENCR_WEP;
315 #endif /* CONFIG_WPS2 */
316         wpa_printf(MSG_DEBUG, "WPS:  * Encryption Type Flags");
317         wpabuf_put_be16(msg, ATTR_ENCR_TYPE_FLAGS);
318         wpabuf_put_be16(msg, 2);
319         wpabuf_put_be16(msg, encr_types);
320         return 0;
321 }
322
323
324 int wps_build_conn_type_flags(struct wps_data *wps, struct wpabuf *msg)
325 {
326         wpa_printf(MSG_DEBUG, "WPS:  * Connection Type Flags");
327         wpabuf_put_be16(msg, ATTR_CONN_TYPE_FLAGS);
328         wpabuf_put_be16(msg, 1);
329         wpabuf_put_u8(msg, WPS_CONN_ESS);
330         return 0;
331 }
332
333
334 int wps_build_assoc_state(struct wps_data *wps, struct wpabuf *msg)
335 {
336         wpa_printf(MSG_DEBUG, "WPS:  * Association State");
337         wpabuf_put_be16(msg, ATTR_ASSOC_STATE);
338         wpabuf_put_be16(msg, 2);
339         wpabuf_put_be16(msg, WPS_ASSOC_NOT_ASSOC);
340         return 0;
341 }
342
343
344 int wps_build_key_wrap_auth(struct wps_data *wps, struct wpabuf *msg)
345 {
346         u8 hash[SHA256_MAC_LEN];
347
348         wpa_printf(MSG_DEBUG, "WPS:  * Key Wrap Authenticator");
349         hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN, wpabuf_head(msg),
350                     wpabuf_len(msg), hash);
351
352         wpabuf_put_be16(msg, ATTR_KEY_WRAP_AUTH);
353         wpabuf_put_be16(msg, WPS_KWA_LEN);
354         wpabuf_put_data(msg, hash, WPS_KWA_LEN);
355         return 0;
356 }
357
358
359 int wps_build_encr_settings(struct wps_data *wps, struct wpabuf *msg,
360                             struct wpabuf *plain)
361 {
362         size_t pad_len;
363         const size_t block_size = 16;
364         u8 *iv, *data;
365
366         wpa_printf(MSG_DEBUG, "WPS:  * Encrypted Settings");
367
368         /* PKCS#5 v2.0 pad */
369         pad_len = block_size - wpabuf_len(plain) % block_size;
370         os_memset(wpabuf_put(plain, pad_len), pad_len, pad_len);
371
372         wpabuf_put_be16(msg, ATTR_ENCR_SETTINGS);
373         wpabuf_put_be16(msg, block_size + wpabuf_len(plain));
374
375         iv = wpabuf_put(msg, block_size);
376         if (random_get_bytes(iv, block_size) < 0)
377                 return -1;
378
379         data = wpabuf_put(msg, 0);
380         wpabuf_put_buf(msg, plain);
381         if (aes_128_cbc_encrypt(wps->keywrapkey, iv, data, wpabuf_len(plain)))
382                 return -1;
383
384         return 0;
385 }
386
387
388 #ifdef CONFIG_WPS_OOB
389 int wps_build_oob_dev_pw(struct wpabuf *msg, u16 dev_pw_id,
390                          const struct wpabuf *pubkey, const u8 *dev_pw,
391                          size_t dev_pw_len)
392 {
393         size_t hash_len;
394         const u8 *addr[1];
395         u8 pubkey_hash[WPS_HASH_LEN];
396
397         wpa_printf(MSG_DEBUG, "WPS:  * OOB Device Password (dev_pw_id=%u)",
398                    dev_pw_id);
399         addr[0] = wpabuf_head(pubkey);
400         hash_len = wpabuf_len(pubkey);
401         sha256_vector(1, addr, &hash_len, pubkey_hash);
402 #ifdef CONFIG_WPS_TESTING
403         if (wps_corrupt_pkhash) {
404                 wpa_hexdump(MSG_DEBUG, "WPS: Real Public Key Hash",
405                             pubkey_hash, WPS_OOB_PUBKEY_HASH_LEN);
406                 wpa_printf(MSG_INFO, "WPS: Testing - corrupt public key hash");
407                 pubkey_hash[WPS_OOB_PUBKEY_HASH_LEN - 2]++;
408         }
409 #endif /* CONFIG_WPS_TESTING */
410
411         wpabuf_put_be16(msg, ATTR_OOB_DEVICE_PASSWORD);
412         wpabuf_put_be16(msg, WPS_OOB_PUBKEY_HASH_LEN + 2 + dev_pw_len);
413         wpa_hexdump(MSG_DEBUG, "WPS: Public Key Hash",
414                     pubkey_hash, WPS_OOB_PUBKEY_HASH_LEN);
415         wpabuf_put_data(msg, pubkey_hash, WPS_OOB_PUBKEY_HASH_LEN);
416         wpabuf_put_be16(msg, dev_pw_id);
417         if (dev_pw) {
418                 wpa_hexdump_key(MSG_DEBUG, "WPS: OOB Device Password",
419                                 dev_pw, dev_pw_len);
420                 wpabuf_put_data(msg, dev_pw, dev_pw_len);
421         }
422
423         return 0;
424 }
425 #endif /* CONFIG_WPS_OOB */
426
427
428 /* Encapsulate WPS IE data with one (or more, if needed) IE headers */
429 struct wpabuf * wps_ie_encapsulate(struct wpabuf *data)
430 {
431         struct wpabuf *ie;
432         const u8 *pos, *end;
433
434         ie = wpabuf_alloc(wpabuf_len(data) + 100);
435         if (ie == NULL) {
436                 wpabuf_free(data);
437                 return NULL;
438         }
439
440         pos = wpabuf_head(data);
441         end = pos + wpabuf_len(data);
442
443         while (end > pos) {
444                 size_t frag_len = end - pos;
445                 if (frag_len > 251)
446                         frag_len = 251;
447                 wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
448                 wpabuf_put_u8(ie, 4 + frag_len);
449                 wpabuf_put_be32(ie, WPS_DEV_OUI_WFA);
450                 wpabuf_put_data(ie, pos, frag_len);
451                 pos += frag_len;
452         }
453
454         wpabuf_free(data);
455
456         return ie;
457 }
458
459
460 int wps_build_mac_addr(struct wpabuf *msg, const u8 *addr)
461 {
462         wpa_printf(MSG_DEBUG, "WPS:  * MAC Address (" MACSTR ")",
463                    MAC2STR(addr));
464         wpabuf_put_be16(msg, ATTR_MAC_ADDR);
465         wpabuf_put_be16(msg, ETH_ALEN);
466         wpabuf_put_data(msg, addr, ETH_ALEN);
467         return 0;
468 }
469
470
471 int wps_build_rf_bands_attr(struct wpabuf *msg, u8 rf_bands)
472 {
473         wpa_printf(MSG_DEBUG, "WPS:  * RF Bands (%x)", rf_bands);
474         wpabuf_put_be16(msg, ATTR_RF_BANDS);
475         wpabuf_put_be16(msg, 1);
476         wpabuf_put_u8(msg, rf_bands);
477         return 0;
478 }
479
480
481 int wps_build_ap_channel(struct wpabuf *msg, u16 ap_channel)
482 {
483         wpa_printf(MSG_DEBUG, "WPS:  * AP Channel (%u)", ap_channel);
484         wpabuf_put_be16(msg, ATTR_AP_CHANNEL);
485         wpabuf_put_be16(msg, 2);
486         wpabuf_put_be16(msg, ap_channel);
487         return 0;
488 }