1/*
2 * hostapd / Configuration helper functions
3 * Copyright (c) 2003-2009, 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 "crypto/sha1.h"
13#include "radius/radius_client.h"
14#include "common/ieee802_11_defs.h"
15#include "common/eapol_common.h"
16#include "eap_common/eap_wsc_common.h"
17#include "eap_server/eap.h"
18#include "wpa_auth.h"
19#include "sta_info.h"
20#include "ap_config.h"
21
22
23static void hostapd_config_free_vlan(struct hostapd_bss_config *bss)
24{
25	struct hostapd_vlan *vlan, *prev;
26
27	vlan = bss->vlan;
28	prev = NULL;
29	while (vlan) {
30		prev = vlan;
31		vlan = vlan->next;
32		os_free(prev);
33	}
34
35	bss->vlan = NULL;
36}
37
38
39void hostapd_config_defaults_bss(struct hostapd_bss_config *bss)
40{
41	bss->logger_syslog_level = HOSTAPD_LEVEL_INFO;
42	bss->logger_stdout_level = HOSTAPD_LEVEL_INFO;
43	bss->logger_syslog = (unsigned int) -1;
44	bss->logger_stdout = (unsigned int) -1;
45
46	bss->auth_algs = WPA_AUTH_ALG_OPEN | WPA_AUTH_ALG_SHARED;
47
48	bss->wep_rekeying_period = 300;
49	/* use key0 in individual key and key1 in broadcast key */
50	bss->broadcast_key_idx_min = 1;
51	bss->broadcast_key_idx_max = 2;
52	bss->eap_reauth_period = 3600;
53
54	bss->wpa_group_rekey = 600;
55	bss->wpa_gmk_rekey = 86400;
56	bss->wpa_key_mgmt = WPA_KEY_MGMT_PSK;
57	bss->wpa_pairwise = WPA_CIPHER_TKIP;
58	bss->wpa_group = WPA_CIPHER_TKIP;
59	bss->rsn_pairwise = 0;
60
61	bss->max_num_sta = MAX_STA_COUNT;
62
63	bss->dtim_period = 2;
64
65	bss->radius_server_auth_port = 1812;
66	bss->ap_max_inactivity = AP_MAX_INACTIVITY;
67	bss->eapol_version = EAPOL_VERSION;
68
69	bss->max_listen_interval = 65535;
70
71	bss->pwd_group = 19; /* ECC: GF(p=256) */
72
73#ifdef CONFIG_IEEE80211W
74	bss->assoc_sa_query_max_timeout = 1000;
75	bss->assoc_sa_query_retry_timeout = 201;
76#endif /* CONFIG_IEEE80211W */
77#ifdef EAP_SERVER_FAST
78	 /* both anonymous and authenticated provisioning */
79	bss->eap_fast_prov = 3;
80	bss->pac_key_lifetime = 7 * 24 * 60 * 60;
81	bss->pac_key_refresh_time = 1 * 24 * 60 * 60;
82#endif /* EAP_SERVER_FAST */
83
84	/* Set to -1 as defaults depends on HT in setup */
85	bss->wmm_enabled = -1;
86
87#ifdef CONFIG_IEEE80211R
88	bss->ft_over_ds = 1;
89#endif /* CONFIG_IEEE80211R */
90}
91
92
93struct hostapd_config * hostapd_config_defaults(void)
94{
95#define ecw2cw(ecw) ((1 << (ecw)) - 1)
96
97	struct hostapd_config *conf;
98	struct hostapd_bss_config *bss;
99	const int aCWmin = 4, aCWmax = 10;
100	const struct hostapd_wmm_ac_params ac_bk =
101		{ aCWmin, aCWmax, 7, 0, 0 }; /* background traffic */
102	const struct hostapd_wmm_ac_params ac_be =
103		{ aCWmin, aCWmax, 3, 0, 0 }; /* best effort traffic */
104	const struct hostapd_wmm_ac_params ac_vi = /* video traffic */
105		{ aCWmin - 1, aCWmin, 2, 3000 / 32, 1 };
106	const struct hostapd_wmm_ac_params ac_vo = /* voice traffic */
107		{ aCWmin - 2, aCWmin - 1, 2, 1500 / 32, 1 };
108	const struct hostapd_tx_queue_params txq_bk =
109		{ 7, ecw2cw(aCWmin), ecw2cw(aCWmax), 0 };
110	const struct hostapd_tx_queue_params txq_be =
111		{ 3, ecw2cw(aCWmin), 4 * (ecw2cw(aCWmin) + 1) - 1, 0};
112	const struct hostapd_tx_queue_params txq_vi =
113		{ 1, (ecw2cw(aCWmin) + 1) / 2 - 1, ecw2cw(aCWmin), 30};
114	const struct hostapd_tx_queue_params txq_vo =
115		{ 1, (ecw2cw(aCWmin) + 1) / 4 - 1,
116		  (ecw2cw(aCWmin) + 1) / 2 - 1, 15};
117
118#undef ecw2cw
119
120	conf = os_zalloc(sizeof(*conf));
121	bss = os_zalloc(sizeof(*bss));
122	if (conf == NULL || bss == NULL) {
123		wpa_printf(MSG_ERROR, "Failed to allocate memory for "
124			   "configuration data.");
125		os_free(conf);
126		os_free(bss);
127		return NULL;
128	}
129
130	bss->radius = os_zalloc(sizeof(*bss->radius));
131	if (bss->radius == NULL) {
132		os_free(conf);
133		os_free(bss);
134		return NULL;
135	}
136
137	hostapd_config_defaults_bss(bss);
138
139	conf->num_bss = 1;
140	conf->bss = bss;
141
142	conf->beacon_int = 100;
143	conf->rts_threshold = -1; /* use driver default: 2347 */
144	conf->fragm_threshold = -1; /* user driver default: 2346 */
145	conf->send_probe_response = 1;
146
147	conf->wmm_ac_params[0] = ac_be;
148	conf->wmm_ac_params[1] = ac_bk;
149	conf->wmm_ac_params[2] = ac_vi;
150	conf->wmm_ac_params[3] = ac_vo;
151
152	conf->tx_queue[0] = txq_vo;
153	conf->tx_queue[1] = txq_vi;
154	conf->tx_queue[2] = txq_be;
155	conf->tx_queue[3] = txq_bk;
156
157	conf->ht_capab = HT_CAP_INFO_SMPS_DISABLED;
158
159	return conf;
160}
161
162
163int hostapd_mac_comp(const void *a, const void *b)
164{
165	return os_memcmp(a, b, sizeof(macaddr));
166}
167
168
169int hostapd_mac_comp_empty(const void *a)
170{
171	macaddr empty = { 0 };
172	return os_memcmp(a, empty, sizeof(macaddr));
173}
174
175
176static int hostapd_config_read_wpa_psk(const char *fname,
177				       struct hostapd_ssid *ssid)
178{
179	FILE *f;
180	char buf[128], *pos;
181	int line = 0, ret = 0, len, ok;
182	u8 addr[ETH_ALEN];
183	struct hostapd_wpa_psk *psk;
184
185	if (!fname)
186		return 0;
187
188	f = fopen(fname, "r");
189	if (!f) {
190		wpa_printf(MSG_ERROR, "WPA PSK file '%s' not found.", fname);
191		return -1;
192	}
193
194	while (fgets(buf, sizeof(buf), f)) {
195		line++;
196
197		if (buf[0] == '#')
198			continue;
199		pos = buf;
200		while (*pos != '\0') {
201			if (*pos == '\n') {
202				*pos = '\0';
203				break;
204			}
205			pos++;
206		}
207		if (buf[0] == '\0')
208			continue;
209
210		if (hwaddr_aton(buf, addr)) {
211			wpa_printf(MSG_ERROR, "Invalid MAC address '%s' on "
212				   "line %d in '%s'", buf, line, fname);
213			ret = -1;
214			break;
215		}
216
217		psk = os_zalloc(sizeof(*psk));
218		if (psk == NULL) {
219			wpa_printf(MSG_ERROR, "WPA PSK allocation failed");
220			ret = -1;
221			break;
222		}
223		if (is_zero_ether_addr(addr))
224			psk->group = 1;
225		else
226			os_memcpy(psk->addr, addr, ETH_ALEN);
227
228		pos = buf + 17;
229		if (*pos == '\0') {
230			wpa_printf(MSG_ERROR, "No PSK on line %d in '%s'",
231				   line, fname);
232			os_free(psk);
233			ret = -1;
234			break;
235		}
236		pos++;
237
238		ok = 0;
239		len = os_strlen(pos);
240		if (len == 64 && hexstr2bin(pos, psk->psk, PMK_LEN) == 0)
241			ok = 1;
242		else if (len >= 8 && len < 64) {
243			pbkdf2_sha1(pos, ssid->ssid, ssid->ssid_len,
244				    4096, psk->psk, PMK_LEN);
245			ok = 1;
246		}
247		if (!ok) {
248			wpa_printf(MSG_ERROR, "Invalid PSK '%s' on line %d in "
249				   "'%s'", pos, line, fname);
250			os_free(psk);
251			ret = -1;
252			break;
253		}
254
255		psk->next = ssid->wpa_psk;
256		ssid->wpa_psk = psk;
257	}
258
259	fclose(f);
260
261	return ret;
262}
263
264
265static int hostapd_derive_psk(struct hostapd_ssid *ssid)
266{
267	ssid->wpa_psk = os_zalloc(sizeof(struct hostapd_wpa_psk));
268	if (ssid->wpa_psk == NULL) {
269		wpa_printf(MSG_ERROR, "Unable to alloc space for PSK");
270		return -1;
271	}
272	wpa_hexdump_ascii(MSG_DEBUG, "SSID",
273			  (u8 *) ssid->ssid, ssid->ssid_len);
274	wpa_hexdump_ascii_key(MSG_DEBUG, "PSK (ASCII passphrase)",
275			      (u8 *) ssid->wpa_passphrase,
276			      os_strlen(ssid->wpa_passphrase));
277	pbkdf2_sha1(ssid->wpa_passphrase,
278		    ssid->ssid, ssid->ssid_len,
279		    4096, ssid->wpa_psk->psk, PMK_LEN);
280	wpa_hexdump_key(MSG_DEBUG, "PSK (from passphrase)",
281			ssid->wpa_psk->psk, PMK_LEN);
282	return 0;
283}
284
285
286int hostapd_setup_wpa_psk(struct hostapd_bss_config *conf)
287{
288	struct hostapd_ssid *ssid = &conf->ssid;
289
290	if (ssid->wpa_passphrase != NULL) {
291		if (ssid->wpa_psk != NULL) {
292			wpa_printf(MSG_DEBUG, "Using pre-configured WPA PSK "
293				   "instead of passphrase");
294		} else {
295			wpa_printf(MSG_DEBUG, "Deriving WPA PSK based on "
296				   "passphrase");
297			if (hostapd_derive_psk(ssid) < 0)
298				return -1;
299		}
300		ssid->wpa_psk->group = 1;
301	}
302
303	if (ssid->wpa_psk_file) {
304		if (hostapd_config_read_wpa_psk(ssid->wpa_psk_file,
305						&conf->ssid))
306			return -1;
307	}
308
309	return 0;
310}
311
312
313int hostapd_wep_key_cmp(struct hostapd_wep_keys *a, struct hostapd_wep_keys *b)
314{
315	int i;
316
317	if (a->idx != b->idx || a->default_len != b->default_len)
318		return 1;
319	for (i = 0; i < NUM_WEP_KEYS; i++)
320		if (a->len[i] != b->len[i] ||
321		    os_memcmp(a->key[i], b->key[i], a->len[i]) != 0)
322			return 1;
323	return 0;
324}
325
326
327static void hostapd_config_free_radius(struct hostapd_radius_server *servers,
328				       int num_servers)
329{
330	int i;
331
332	for (i = 0; i < num_servers; i++) {
333		os_free(servers[i].shared_secret);
334	}
335	os_free(servers);
336}
337
338
339static void hostapd_config_free_eap_user(struct hostapd_eap_user *user)
340{
341	os_free(user->identity);
342	os_free(user->password);
343	os_free(user);
344}
345
346
347static void hostapd_config_free_wep(struct hostapd_wep_keys *keys)
348{
349	int i;
350	for (i = 0; i < NUM_WEP_KEYS; i++) {
351		os_free(keys->key[i]);
352		keys->key[i] = NULL;
353	}
354}
355
356
357static void hostapd_config_free_bss(struct hostapd_bss_config *conf)
358{
359	struct hostapd_wpa_psk *psk, *prev;
360	struct hostapd_eap_user *user, *prev_user;
361
362	if (conf == NULL)
363		return;
364
365	psk = conf->ssid.wpa_psk;
366	while (psk) {
367		prev = psk;
368		psk = psk->next;
369		os_free(prev);
370	}
371
372	os_free(conf->ssid.wpa_passphrase);
373	os_free(conf->ssid.wpa_psk_file);
374	hostapd_config_free_wep(&conf->ssid.wep);
375#ifdef CONFIG_FULL_DYNAMIC_VLAN
376	os_free(conf->ssid.vlan_tagged_interface);
377#endif /* CONFIG_FULL_DYNAMIC_VLAN */
378
379	user = conf->eap_user;
380	while (user) {
381		prev_user = user;
382		user = user->next;
383		hostapd_config_free_eap_user(prev_user);
384	}
385
386	os_free(conf->dump_log_name);
387	os_free(conf->eap_req_id_text);
388	os_free(conf->accept_mac);
389	os_free(conf->deny_mac);
390	os_free(conf->nas_identifier);
391	hostapd_config_free_radius(conf->radius->auth_servers,
392				   conf->radius->num_auth_servers);
393	hostapd_config_free_radius(conf->radius->acct_servers,
394				   conf->radius->num_acct_servers);
395	os_free(conf->rsn_preauth_interfaces);
396	os_free(conf->ctrl_interface);
397	os_free(conf->ca_cert);
398	os_free(conf->server_cert);
399	os_free(conf->private_key);
400	os_free(conf->private_key_passwd);
401	os_free(conf->dh_file);
402	os_free(conf->pac_opaque_encr_key);
403	os_free(conf->eap_fast_a_id);
404	os_free(conf->eap_fast_a_id_info);
405	os_free(conf->eap_sim_db);
406	os_free(conf->radius_server_clients);
407	os_free(conf->test_socket);
408	os_free(conf->radius);
409	hostapd_config_free_vlan(conf);
410	if (conf->ssid.dyn_vlan_keys) {
411		struct hostapd_ssid *ssid = &conf->ssid;
412		size_t i;
413		for (i = 0; i <= ssid->max_dyn_vlan_keys; i++) {
414			if (ssid->dyn_vlan_keys[i] == NULL)
415				continue;
416			hostapd_config_free_wep(ssid->dyn_vlan_keys[i]);
417			os_free(ssid->dyn_vlan_keys[i]);
418		}
419		os_free(ssid->dyn_vlan_keys);
420		ssid->dyn_vlan_keys = NULL;
421	}
422
423	os_free(conf->time_zone);
424
425#ifdef CONFIG_IEEE80211R
426	{
427		struct ft_remote_r0kh *r0kh, *r0kh_prev;
428		struct ft_remote_r1kh *r1kh, *r1kh_prev;
429
430		r0kh = conf->r0kh_list;
431		conf->r0kh_list = NULL;
432		while (r0kh) {
433			r0kh_prev = r0kh;
434			r0kh = r0kh->next;
435			os_free(r0kh_prev);
436		}
437
438		r1kh = conf->r1kh_list;
439		conf->r1kh_list = NULL;
440		while (r1kh) {
441			r1kh_prev = r1kh;
442			r1kh = r1kh->next;
443			os_free(r1kh_prev);
444		}
445	}
446#endif /* CONFIG_IEEE80211R */
447
448#ifdef ANDROID_P2P
449	os_free(conf->prioritize);
450#endif
451#ifdef CONFIG_WPS
452	os_free(conf->wps_pin_requests);
453	os_free(conf->device_name);
454	os_free(conf->manufacturer);
455	os_free(conf->model_name);
456	os_free(conf->model_number);
457	os_free(conf->serial_number);
458	os_free(conf->config_methods);
459	os_free(conf->ap_pin);
460	os_free(conf->extra_cred);
461	os_free(conf->ap_settings);
462	os_free(conf->upnp_iface);
463	os_free(conf->friendly_name);
464	os_free(conf->manufacturer_url);
465	os_free(conf->model_description);
466	os_free(conf->model_url);
467	os_free(conf->upc);
468#endif /* CONFIG_WPS */
469
470	os_free(conf->roaming_consortium);
471
472#ifdef CONFIG_RADIUS_TEST
473	os_free(conf->dump_msk_file);
474#endif /* CONFIG_RADIUS_TEST */
475}
476
477
478/**
479 * hostapd_config_free - Free hostapd configuration
480 * @conf: Configuration data from hostapd_config_read().
481 */
482void hostapd_config_free(struct hostapd_config *conf)
483{
484	size_t i;
485
486	if (conf == NULL)
487		return;
488
489	for (i = 0; i < conf->num_bss; i++)
490		hostapd_config_free_bss(&conf->bss[i]);
491	os_free(conf->bss);
492	os_free(conf->supported_rates);
493	os_free(conf->basic_rates);
494
495	os_free(conf);
496}
497
498
499/**
500 * hostapd_maclist_found - Find a MAC address from a list
501 * @list: MAC address list
502 * @num_entries: Number of addresses in the list
503 * @addr: Address to search for
504 * @vlan_id: Buffer for returning VLAN ID or %NULL if not needed
505 * Returns: 1 if address is in the list or 0 if not.
506 *
507 * Perform a binary search for given MAC address from a pre-sorted list.
508 */
509int hostapd_maclist_found(struct mac_acl_entry *list, int num_entries,
510			  const u8 *addr, int *vlan_id)
511{
512	int start, end, middle, res;
513
514	start = 0;
515	end = num_entries - 1;
516
517	while (start <= end) {
518		middle = (start + end) / 2;
519		res = os_memcmp(list[middle].addr, addr, ETH_ALEN);
520		if (res == 0) {
521			if (vlan_id)
522				*vlan_id = list[middle].vlan_id;
523			return 1;
524		}
525		if (res < 0)
526			start = middle + 1;
527		else
528			end = middle - 1;
529	}
530
531	return 0;
532}
533
534
535int hostapd_rate_found(int *list, int rate)
536{
537	int i;
538
539	if (list == NULL)
540		return 0;
541
542	for (i = 0; list[i] >= 0; i++)
543		if (list[i] == rate)
544			return 1;
545
546	return 0;
547}
548
549
550const char * hostapd_get_vlan_id_ifname(struct hostapd_vlan *vlan, int vlan_id)
551{
552	struct hostapd_vlan *v = vlan;
553	while (v) {
554		if (v->vlan_id == vlan_id || v->vlan_id == VLAN_ID_WILDCARD)
555			return v->ifname;
556		v = v->next;
557	}
558	return NULL;
559}
560
561
562const u8 * hostapd_get_psk(const struct hostapd_bss_config *conf,
563			   const u8 *addr, const u8 *prev_psk)
564{
565	struct hostapd_wpa_psk *psk;
566	int next_ok = prev_psk == NULL;
567
568	for (psk = conf->ssid.wpa_psk; psk != NULL; psk = psk->next) {
569		if (next_ok &&
570		    (psk->group || os_memcmp(psk->addr, addr, ETH_ALEN) == 0))
571			return psk->psk;
572
573		if (psk->psk == prev_psk)
574			next_ok = 1;
575	}
576
577	return NULL;
578}
579
580
581const struct hostapd_eap_user *
582hostapd_get_eap_user(const struct hostapd_bss_config *conf, const u8 *identity,
583		     size_t identity_len, int phase2)
584{
585	struct hostapd_eap_user *user = conf->eap_user;
586
587#ifdef CONFIG_WPS
588	if (conf->wps_state && identity_len == WSC_ID_ENROLLEE_LEN &&
589	    os_memcmp(identity, WSC_ID_ENROLLEE, WSC_ID_ENROLLEE_LEN) == 0) {
590		static struct hostapd_eap_user wsc_enrollee;
591		os_memset(&wsc_enrollee, 0, sizeof(wsc_enrollee));
592		wsc_enrollee.methods[0].method = eap_server_get_type(
593			"WSC", &wsc_enrollee.methods[0].vendor);
594		return &wsc_enrollee;
595	}
596
597	if (conf->wps_state && identity_len == WSC_ID_REGISTRAR_LEN &&
598	    os_memcmp(identity, WSC_ID_REGISTRAR, WSC_ID_REGISTRAR_LEN) == 0) {
599		static struct hostapd_eap_user wsc_registrar;
600		os_memset(&wsc_registrar, 0, sizeof(wsc_registrar));
601		wsc_registrar.methods[0].method = eap_server_get_type(
602			"WSC", &wsc_registrar.methods[0].vendor);
603		wsc_registrar.password = (u8 *) conf->ap_pin;
604		wsc_registrar.password_len = conf->ap_pin ?
605			os_strlen(conf->ap_pin) : 0;
606		return &wsc_registrar;
607	}
608#endif /* CONFIG_WPS */
609
610	while (user) {
611		if (!phase2 && user->identity == NULL) {
612			/* Wildcard match */
613			break;
614		}
615
616		if (user->phase2 == !!phase2 && user->wildcard_prefix &&
617		    identity_len >= user->identity_len &&
618		    os_memcmp(user->identity, identity, user->identity_len) ==
619		    0) {
620			/* Wildcard prefix match */
621			break;
622		}
623
624		if (user->phase2 == !!phase2 &&
625		    user->identity_len == identity_len &&
626		    os_memcmp(user->identity, identity, identity_len) == 0)
627			break;
628		user = user->next;
629	}
630
631	return user;
632}
633