1 /*
2 * hostapd / Configuration helper functions
3 * Copyright (c) 2003-2009, Jouni Malinen <j@w1.fi>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
11 *
12 * See README and COPYING for more details.
13 */
14
15 #include "utils/includes.h"
16
17 #include "utils/common.h"
18 #include "crypto/sha1.h"
19 #include "radius/radius_client.h"
20 #include "common/ieee802_11_defs.h"
21 #include "common/eapol_common.h"
22 #include "eap_common/eap_wsc_common.h"
23 #include "eap_server/eap.h"
24 #include "wpa_auth.h"
25 #include "sta_info.h"
26 #include "ap_config.h"
27
28
hostapd_config_free_vlan(struct hostapd_bss_config * bss)29 static void hostapd_config_free_vlan(struct hostapd_bss_config *bss)
30 {
31 struct hostapd_vlan *vlan, *prev;
32
33 vlan = bss->vlan;
34 prev = NULL;
35 while (vlan) {
36 prev = vlan;
37 vlan = vlan->next;
38 os_free(prev);
39 }
40
41 bss->vlan = NULL;
42 }
43
44
hostapd_config_defaults_bss(struct hostapd_bss_config * bss)45 void hostapd_config_defaults_bss(struct hostapd_bss_config *bss)
46 {
47 bss->logger_syslog_level = HOSTAPD_LEVEL_INFO;
48 bss->logger_stdout_level = HOSTAPD_LEVEL_INFO;
49 bss->logger_syslog = (unsigned int) -1;
50 bss->logger_stdout = (unsigned int) -1;
51
52 bss->auth_algs = WPA_AUTH_ALG_OPEN | WPA_AUTH_ALG_SHARED;
53
54 bss->wep_rekeying_period = 300;
55 /* use key0 in individual key and key1 in broadcast key */
56 bss->broadcast_key_idx_min = 1;
57 bss->broadcast_key_idx_max = 2;
58 bss->eap_reauth_period = 3600;
59
60 bss->wpa_group_rekey = 600;
61 bss->wpa_gmk_rekey = 86400;
62 bss->wpa_key_mgmt = WPA_KEY_MGMT_PSK;
63 bss->wpa_pairwise = WPA_CIPHER_TKIP;
64 bss->wpa_group = WPA_CIPHER_TKIP;
65 bss->rsn_pairwise = 0;
66
67 bss->max_num_sta = MAX_STA_COUNT;
68
69 bss->dtim_period = 2;
70
71 bss->radius_server_auth_port = 1812;
72 bss->ap_max_inactivity = AP_MAX_INACTIVITY;
73 bss->eapol_version = EAPOL_VERSION;
74
75 bss->max_listen_interval = 65535;
76
77 bss->pwd_group = 19; /* ECC: GF(p=256) */
78
79 #ifdef CONFIG_IEEE80211W
80 bss->assoc_sa_query_max_timeout = 1000;
81 bss->assoc_sa_query_retry_timeout = 201;
82 #endif /* CONFIG_IEEE80211W */
83 #ifdef EAP_SERVER_FAST
84 /* both anonymous and authenticated provisioning */
85 bss->eap_fast_prov = 3;
86 bss->pac_key_lifetime = 7 * 24 * 60 * 60;
87 bss->pac_key_refresh_time = 1 * 24 * 60 * 60;
88 #endif /* EAP_SERVER_FAST */
89
90 /* Set to -1 as defaults depends on HT in setup */
91 bss->wmm_enabled = -1;
92
93 #ifdef CONFIG_IEEE80211R
94 bss->ft_over_ds = 1;
95 #endif /* CONFIG_IEEE80211R */
96 }
97
98
hostapd_config_defaults(void)99 struct hostapd_config * hostapd_config_defaults(void)
100 {
101 #define ecw2cw(ecw) ((1 << (ecw)) - 1)
102
103 struct hostapd_config *conf;
104 struct hostapd_bss_config *bss;
105 const int aCWmin = 4, aCWmax = 10;
106 const struct hostapd_wmm_ac_params ac_bk =
107 { aCWmin, aCWmax, 7, 0, 0 }; /* background traffic */
108 const struct hostapd_wmm_ac_params ac_be =
109 { aCWmin, aCWmax, 3, 0, 0 }; /* best effort traffic */
110 const struct hostapd_wmm_ac_params ac_vi = /* video traffic */
111 { aCWmin - 1, aCWmin, 2, 3000 / 32, 1 };
112 const struct hostapd_wmm_ac_params ac_vo = /* voice traffic */
113 { aCWmin - 2, aCWmin - 1, 2, 1500 / 32, 1 };
114 const struct hostapd_tx_queue_params txq_bk =
115 { 7, ecw2cw(aCWmin), ecw2cw(aCWmax), 0 };
116 const struct hostapd_tx_queue_params txq_be =
117 { 3, ecw2cw(aCWmin), 4 * (ecw2cw(aCWmin) + 1) - 1, 0};
118 const struct hostapd_tx_queue_params txq_vi =
119 { 1, (ecw2cw(aCWmin) + 1) / 2 - 1, ecw2cw(aCWmin), 30};
120 const struct hostapd_tx_queue_params txq_vo =
121 { 1, (ecw2cw(aCWmin) + 1) / 4 - 1,
122 (ecw2cw(aCWmin) + 1) / 2 - 1, 15};
123
124 #undef ecw2cw
125
126 conf = os_zalloc(sizeof(*conf));
127 bss = os_zalloc(sizeof(*bss));
128 if (conf == NULL || bss == NULL) {
129 wpa_printf(MSG_ERROR, "Failed to allocate memory for "
130 "configuration data.");
131 os_free(conf);
132 os_free(bss);
133 return NULL;
134 }
135
136 bss->radius = os_zalloc(sizeof(*bss->radius));
137 if (bss->radius == NULL) {
138 os_free(conf);
139 os_free(bss);
140 return NULL;
141 }
142
143 hostapd_config_defaults_bss(bss);
144
145 conf->num_bss = 1;
146 conf->bss = bss;
147
148 conf->beacon_int = 100;
149 conf->rts_threshold = -1; /* use driver default: 2347 */
150 conf->fragm_threshold = -1; /* user driver default: 2346 */
151 conf->send_probe_response = 1;
152
153 conf->wmm_ac_params[0] = ac_be;
154 conf->wmm_ac_params[1] = ac_bk;
155 conf->wmm_ac_params[2] = ac_vi;
156 conf->wmm_ac_params[3] = ac_vo;
157
158 conf->tx_queue[0] = txq_vo;
159 conf->tx_queue[1] = txq_vi;
160 conf->tx_queue[2] = txq_be;
161 conf->tx_queue[3] = txq_bk;
162
163 conf->ht_capab = HT_CAP_INFO_SMPS_DISABLED;
164
165 return conf;
166 }
167
168
hostapd_mac_comp(const void * a,const void * b)169 int hostapd_mac_comp(const void *a, const void *b)
170 {
171 return os_memcmp(a, b, sizeof(macaddr));
172 }
173
174
hostapd_mac_comp_empty(const void * a)175 int hostapd_mac_comp_empty(const void *a)
176 {
177 macaddr empty = { 0 };
178 return os_memcmp(a, empty, sizeof(macaddr));
179 }
180
181
hostapd_config_read_wpa_psk(const char * fname,struct hostapd_ssid * ssid)182 static int hostapd_config_read_wpa_psk(const char *fname,
183 struct hostapd_ssid *ssid)
184 {
185 FILE *f;
186 char buf[128], *pos;
187 int line = 0, ret = 0, len, ok;
188 u8 addr[ETH_ALEN];
189 struct hostapd_wpa_psk *psk;
190
191 if (!fname)
192 return 0;
193
194 f = fopen(fname, "r");
195 if (!f) {
196 wpa_printf(MSG_ERROR, "WPA PSK file '%s' not found.", fname);
197 return -1;
198 }
199
200 while (fgets(buf, sizeof(buf), f)) {
201 line++;
202
203 if (buf[0] == '#')
204 continue;
205 pos = buf;
206 while (*pos != '\0') {
207 if (*pos == '\n') {
208 *pos = '\0';
209 break;
210 }
211 pos++;
212 }
213 if (buf[0] == '\0')
214 continue;
215
216 if (hwaddr_aton(buf, addr)) {
217 wpa_printf(MSG_ERROR, "Invalid MAC address '%s' on "
218 "line %d in '%s'", buf, line, fname);
219 ret = -1;
220 break;
221 }
222
223 psk = os_zalloc(sizeof(*psk));
224 if (psk == NULL) {
225 wpa_printf(MSG_ERROR, "WPA PSK allocation failed");
226 ret = -1;
227 break;
228 }
229 if (is_zero_ether_addr(addr))
230 psk->group = 1;
231 else
232 os_memcpy(psk->addr, addr, ETH_ALEN);
233
234 pos = buf + 17;
235 if (*pos == '\0') {
236 wpa_printf(MSG_ERROR, "No PSK on line %d in '%s'",
237 line, fname);
238 os_free(psk);
239 ret = -1;
240 break;
241 }
242 pos++;
243
244 ok = 0;
245 len = os_strlen(pos);
246 if (len == 64 && hexstr2bin(pos, psk->psk, PMK_LEN) == 0)
247 ok = 1;
248 else if (len >= 8 && len < 64) {
249 pbkdf2_sha1(pos, ssid->ssid, ssid->ssid_len,
250 4096, psk->psk, PMK_LEN);
251 ok = 1;
252 }
253 if (!ok) {
254 wpa_printf(MSG_ERROR, "Invalid PSK '%s' on line %d in "
255 "'%s'", pos, line, fname);
256 os_free(psk);
257 ret = -1;
258 break;
259 }
260
261 psk->next = ssid->wpa_psk;
262 ssid->wpa_psk = psk;
263 }
264
265 fclose(f);
266
267 return ret;
268 }
269
270
hostapd_derive_psk(struct hostapd_ssid * ssid)271 static int hostapd_derive_psk(struct hostapd_ssid *ssid)
272 {
273 ssid->wpa_psk = os_zalloc(sizeof(struct hostapd_wpa_psk));
274 if (ssid->wpa_psk == NULL) {
275 wpa_printf(MSG_ERROR, "Unable to alloc space for PSK");
276 return -1;
277 }
278 wpa_hexdump_ascii(MSG_DEBUG, "SSID",
279 (u8 *) ssid->ssid, ssid->ssid_len);
280 wpa_hexdump_ascii_key(MSG_DEBUG, "PSK (ASCII passphrase)",
281 (u8 *) ssid->wpa_passphrase,
282 os_strlen(ssid->wpa_passphrase));
283 pbkdf2_sha1(ssid->wpa_passphrase,
284 ssid->ssid, ssid->ssid_len,
285 4096, ssid->wpa_psk->psk, PMK_LEN);
286 wpa_hexdump_key(MSG_DEBUG, "PSK (from passphrase)",
287 ssid->wpa_psk->psk, PMK_LEN);
288 return 0;
289 }
290
291
hostapd_setup_wpa_psk(struct hostapd_bss_config * conf)292 int hostapd_setup_wpa_psk(struct hostapd_bss_config *conf)
293 {
294 struct hostapd_ssid *ssid = &conf->ssid;
295
296 if (ssid->wpa_passphrase != NULL) {
297 if (ssid->wpa_psk != NULL) {
298 wpa_printf(MSG_DEBUG, "Using pre-configured WPA PSK "
299 "instead of passphrase");
300 } else {
301 wpa_printf(MSG_DEBUG, "Deriving WPA PSK based on "
302 "passphrase");
303 if (hostapd_derive_psk(ssid) < 0)
304 return -1;
305 }
306 ssid->wpa_psk->group = 1;
307 }
308
309 if (ssid->wpa_psk_file) {
310 if (hostapd_config_read_wpa_psk(ssid->wpa_psk_file,
311 &conf->ssid))
312 return -1;
313 }
314
315 return 0;
316 }
317
318
hostapd_wep_key_cmp(struct hostapd_wep_keys * a,struct hostapd_wep_keys * b)319 int hostapd_wep_key_cmp(struct hostapd_wep_keys *a, struct hostapd_wep_keys *b)
320 {
321 int i;
322
323 if (a->idx != b->idx || a->default_len != b->default_len)
324 return 1;
325 for (i = 0; i < NUM_WEP_KEYS; i++)
326 if (a->len[i] != b->len[i] ||
327 os_memcmp(a->key[i], b->key[i], a->len[i]) != 0)
328 return 1;
329 return 0;
330 }
331
332
hostapd_config_free_radius(struct hostapd_radius_server * servers,int num_servers)333 static void hostapd_config_free_radius(struct hostapd_radius_server *servers,
334 int num_servers)
335 {
336 int i;
337
338 for (i = 0; i < num_servers; i++) {
339 os_free(servers[i].shared_secret);
340 }
341 os_free(servers);
342 }
343
344
hostapd_config_free_eap_user(struct hostapd_eap_user * user)345 static void hostapd_config_free_eap_user(struct hostapd_eap_user *user)
346 {
347 os_free(user->identity);
348 os_free(user->password);
349 os_free(user);
350 }
351
352
hostapd_config_free_wep(struct hostapd_wep_keys * keys)353 static void hostapd_config_free_wep(struct hostapd_wep_keys *keys)
354 {
355 int i;
356 for (i = 0; i < NUM_WEP_KEYS; i++) {
357 os_free(keys->key[i]);
358 keys->key[i] = NULL;
359 }
360 }
361
362
hostapd_config_free_bss(struct hostapd_bss_config * conf)363 static void hostapd_config_free_bss(struct hostapd_bss_config *conf)
364 {
365 struct hostapd_wpa_psk *psk, *prev;
366 struct hostapd_eap_user *user, *prev_user;
367
368 if (conf == NULL)
369 return;
370
371 psk = conf->ssid.wpa_psk;
372 while (psk) {
373 prev = psk;
374 psk = psk->next;
375 os_free(prev);
376 }
377
378 os_free(conf->ssid.wpa_passphrase);
379 os_free(conf->ssid.wpa_psk_file);
380 hostapd_config_free_wep(&conf->ssid.wep);
381 #ifdef CONFIG_FULL_DYNAMIC_VLAN
382 os_free(conf->ssid.vlan_tagged_interface);
383 #endif /* CONFIG_FULL_DYNAMIC_VLAN */
384
385 user = conf->eap_user;
386 while (user) {
387 prev_user = user;
388 user = user->next;
389 hostapd_config_free_eap_user(prev_user);
390 }
391
392 os_free(conf->dump_log_name);
393 os_free(conf->eap_req_id_text);
394 os_free(conf->accept_mac);
395 os_free(conf->deny_mac);
396 os_free(conf->nas_identifier);
397 hostapd_config_free_radius(conf->radius->auth_servers,
398 conf->radius->num_auth_servers);
399 hostapd_config_free_radius(conf->radius->acct_servers,
400 conf->radius->num_acct_servers);
401 os_free(conf->rsn_preauth_interfaces);
402 os_free(conf->ctrl_interface);
403 os_free(conf->ca_cert);
404 os_free(conf->server_cert);
405 os_free(conf->private_key);
406 os_free(conf->private_key_passwd);
407 os_free(conf->dh_file);
408 os_free(conf->pac_opaque_encr_key);
409 os_free(conf->eap_fast_a_id);
410 os_free(conf->eap_fast_a_id_info);
411 os_free(conf->eap_sim_db);
412 os_free(conf->radius_server_clients);
413 os_free(conf->test_socket);
414 os_free(conf->radius);
415 hostapd_config_free_vlan(conf);
416 if (conf->ssid.dyn_vlan_keys) {
417 struct hostapd_ssid *ssid = &conf->ssid;
418 size_t i;
419 for (i = 0; i <= ssid->max_dyn_vlan_keys; i++) {
420 if (ssid->dyn_vlan_keys[i] == NULL)
421 continue;
422 hostapd_config_free_wep(ssid->dyn_vlan_keys[i]);
423 os_free(ssid->dyn_vlan_keys[i]);
424 }
425 os_free(ssid->dyn_vlan_keys);
426 ssid->dyn_vlan_keys = NULL;
427 }
428
429 #ifdef CONFIG_IEEE80211R
430 {
431 struct ft_remote_r0kh *r0kh, *r0kh_prev;
432 struct ft_remote_r1kh *r1kh, *r1kh_prev;
433
434 r0kh = conf->r0kh_list;
435 conf->r0kh_list = NULL;
436 while (r0kh) {
437 r0kh_prev = r0kh;
438 r0kh = r0kh->next;
439 os_free(r0kh_prev);
440 }
441
442 r1kh = conf->r1kh_list;
443 conf->r1kh_list = NULL;
444 while (r1kh) {
445 r1kh_prev = r1kh;
446 r1kh = r1kh->next;
447 os_free(r1kh_prev);
448 }
449 }
450 #endif /* CONFIG_IEEE80211R */
451
452 #ifdef CONFIG_WPS
453 os_free(conf->wps_pin_requests);
454 os_free(conf->device_name);
455 os_free(conf->manufacturer);
456 os_free(conf->model_name);
457 os_free(conf->model_number);
458 os_free(conf->serial_number);
459 os_free(conf->config_methods);
460 os_free(conf->ap_pin);
461 os_free(conf->extra_cred);
462 os_free(conf->ap_settings);
463 os_free(conf->upnp_iface);
464 os_free(conf->friendly_name);
465 os_free(conf->manufacturer_url);
466 os_free(conf->model_description);
467 os_free(conf->model_url);
468 os_free(conf->upc);
469 #endif /* CONFIG_WPS */
470 }
471
472
473 /**
474 * hostapd_config_free - Free hostapd configuration
475 * @conf: Configuration data from hostapd_config_read().
476 */
hostapd_config_free(struct hostapd_config * conf)477 void hostapd_config_free(struct hostapd_config *conf)
478 {
479 size_t i;
480
481 if (conf == NULL)
482 return;
483
484 for (i = 0; i < conf->num_bss; i++)
485 hostapd_config_free_bss(&conf->bss[i]);
486 os_free(conf->bss);
487 os_free(conf->supported_rates);
488 os_free(conf->basic_rates);
489
490 os_free(conf);
491 }
492
493
494 /**
495 * hostapd_maclist_found - Find a MAC address from a list
496 * @list: MAC address list
497 * @num_entries: Number of addresses in the list
498 * @addr: Address to search for
499 * @vlan_id: Buffer for returning VLAN ID or %NULL if not needed
500 * Returns: 1 if address is in the list or 0 if not.
501 *
502 * Perform a binary search for given MAC address from a pre-sorted list.
503 */
hostapd_maclist_found(struct mac_acl_entry * list,int num_entries,const u8 * addr,int * vlan_id)504 int hostapd_maclist_found(struct mac_acl_entry *list, int num_entries,
505 const u8 *addr, int *vlan_id)
506 {
507 int start, end, middle, res;
508
509 start = 0;
510 end = num_entries - 1;
511
512 while (start <= end) {
513 middle = (start + end) / 2;
514 res = os_memcmp(list[middle].addr, addr, ETH_ALEN);
515 if (res == 0) {
516 if (vlan_id)
517 *vlan_id = list[middle].vlan_id;
518 return 1;
519 }
520 if (res < 0)
521 start = middle + 1;
522 else
523 end = middle - 1;
524 }
525
526 return 0;
527 }
528
529
hostapd_rate_found(int * list,int rate)530 int hostapd_rate_found(int *list, int rate)
531 {
532 int i;
533
534 if (list == NULL)
535 return 0;
536
537 for (i = 0; list[i] >= 0; i++)
538 if (list[i] == rate)
539 return 1;
540
541 return 0;
542 }
543
544
hostapd_get_vlan_id_ifname(struct hostapd_vlan * vlan,int vlan_id)545 const char * hostapd_get_vlan_id_ifname(struct hostapd_vlan *vlan, int vlan_id)
546 {
547 struct hostapd_vlan *v = vlan;
548 while (v) {
549 if (v->vlan_id == vlan_id || v->vlan_id == VLAN_ID_WILDCARD)
550 return v->ifname;
551 v = v->next;
552 }
553 return NULL;
554 }
555
556
hostapd_get_psk(const struct hostapd_bss_config * conf,const u8 * addr,const u8 * prev_psk)557 const u8 * hostapd_get_psk(const struct hostapd_bss_config *conf,
558 const u8 *addr, const u8 *prev_psk)
559 {
560 struct hostapd_wpa_psk *psk;
561 int next_ok = prev_psk == NULL;
562
563 for (psk = conf->ssid.wpa_psk; psk != NULL; psk = psk->next) {
564 if (next_ok &&
565 (psk->group || os_memcmp(psk->addr, addr, ETH_ALEN) == 0))
566 return psk->psk;
567
568 if (psk->psk == prev_psk)
569 next_ok = 1;
570 }
571
572 return NULL;
573 }
574
575
576 const struct hostapd_eap_user *
hostapd_get_eap_user(const struct hostapd_bss_config * conf,const u8 * identity,size_t identity_len,int phase2)577 hostapd_get_eap_user(const struct hostapd_bss_config *conf, const u8 *identity,
578 size_t identity_len, int phase2)
579 {
580 struct hostapd_eap_user *user = conf->eap_user;
581
582 #ifdef CONFIG_WPS
583 if (conf->wps_state && identity_len == WSC_ID_ENROLLEE_LEN &&
584 os_memcmp(identity, WSC_ID_ENROLLEE, WSC_ID_ENROLLEE_LEN) == 0) {
585 static struct hostapd_eap_user wsc_enrollee;
586 os_memset(&wsc_enrollee, 0, sizeof(wsc_enrollee));
587 wsc_enrollee.methods[0].method = eap_server_get_type(
588 "WSC", &wsc_enrollee.methods[0].vendor);
589 return &wsc_enrollee;
590 }
591
592 if (conf->wps_state && identity_len == WSC_ID_REGISTRAR_LEN &&
593 os_memcmp(identity, WSC_ID_REGISTRAR, WSC_ID_REGISTRAR_LEN) == 0) {
594 static struct hostapd_eap_user wsc_registrar;
595 os_memset(&wsc_registrar, 0, sizeof(wsc_registrar));
596 wsc_registrar.methods[0].method = eap_server_get_type(
597 "WSC", &wsc_registrar.methods[0].vendor);
598 wsc_registrar.password = (u8 *) conf->ap_pin;
599 wsc_registrar.password_len = conf->ap_pin ?
600 os_strlen(conf->ap_pin) : 0;
601 return &wsc_registrar;
602 }
603 #endif /* CONFIG_WPS */
604
605 while (user) {
606 if (!phase2 && user->identity == NULL) {
607 /* Wildcard match */
608 break;
609 }
610
611 if (user->phase2 == !!phase2 && user->wildcard_prefix &&
612 identity_len >= user->identity_len &&
613 os_memcmp(user->identity, identity, user->identity_len) ==
614 0) {
615 /* Wildcard prefix match */
616 break;
617 }
618
619 if (user->phase2 == !!phase2 &&
620 user->identity_len == identity_len &&
621 os_memcmp(user->identity, identity, identity_len) == 0)
622 break;
623 user = user->next;
624 }
625
626 return user;
627 }
628