1/*
2 * hostapd / EAP user database
3 * Copyright (c) 2012, 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#ifdef CONFIG_SQLITE
11#include <sqlite3.h>
12#endif /* CONFIG_SQLITE */
13
14#include "common.h"
15#include "eap_common/eap_wsc_common.h"
16#include "eap_server/eap_methods.h"
17#include "eap_server/eap.h"
18#include "ap_config.h"
19#include "hostapd.h"
20
21#ifdef CONFIG_SQLITE
22
23static void set_user_methods(struct hostapd_eap_user *user, const char *methods)
24{
25	char *buf, *start;
26	int num_methods;
27
28	buf = os_strdup(methods);
29	if (buf == NULL)
30		return;
31
32	os_memset(&user->methods, 0, sizeof(user->methods));
33	num_methods = 0;
34	start = buf;
35	while (*start) {
36		char *pos3 = os_strchr(start, ',');
37		if (pos3)
38			*pos3++ = '\0';
39		user->methods[num_methods].method =
40			eap_server_get_type(start,
41					    &user->methods[num_methods].vendor);
42		if (user->methods[num_methods].vendor == EAP_VENDOR_IETF &&
43		    user->methods[num_methods].method == EAP_TYPE_NONE) {
44			if (os_strcmp(start, "TTLS-PAP") == 0) {
45				user->ttls_auth |= EAP_TTLS_AUTH_PAP;
46				goto skip_eap;
47			}
48			if (os_strcmp(start, "TTLS-CHAP") == 0) {
49				user->ttls_auth |= EAP_TTLS_AUTH_CHAP;
50				goto skip_eap;
51			}
52			if (os_strcmp(start, "TTLS-MSCHAP") == 0) {
53				user->ttls_auth |= EAP_TTLS_AUTH_MSCHAP;
54				goto skip_eap;
55			}
56			if (os_strcmp(start, "TTLS-MSCHAPV2") == 0) {
57				user->ttls_auth |= EAP_TTLS_AUTH_MSCHAPV2;
58				goto skip_eap;
59			}
60			wpa_printf(MSG_INFO, "DB: Unsupported EAP type '%s'",
61				   start);
62			os_free(buf);
63			return;
64		}
65
66		num_methods++;
67		if (num_methods >= EAP_MAX_METHODS)
68			break;
69	skip_eap:
70		if (pos3 == NULL)
71			break;
72		start = pos3;
73	}
74
75	os_free(buf);
76}
77
78
79static int get_user_cb(void *ctx, int argc, char *argv[], char *col[])
80{
81	struct hostapd_eap_user *user = ctx;
82	int i;
83
84	for (i = 0; i < argc; i++) {
85		if (os_strcmp(col[i], "password") == 0 && argv[i]) {
86			os_free(user->password);
87			user->password_len = os_strlen(argv[i]);
88			user->password = (u8 *) os_strdup(argv[i]);
89			user->next = (void *) 1;
90		} else if (os_strcmp(col[i], "methods") == 0 && argv[i]) {
91			set_user_methods(user, argv[i]);
92		}
93	}
94
95	return 0;
96}
97
98
99static int get_wildcard_cb(void *ctx, int argc, char *argv[], char *col[])
100{
101	struct hostapd_eap_user *user = ctx;
102	int i, id = -1, methods = -1;
103	size_t len;
104
105	for (i = 0; i < argc; i++) {
106		if (os_strcmp(col[i], "identity") == 0 && argv[i])
107			id = i;
108		else if (os_strcmp(col[i], "methods") == 0 && argv[i])
109			methods = i;
110	}
111
112	if (id < 0 || methods < 0)
113		return 0;
114
115	len = os_strlen(argv[id]);
116	if (len <= user->identity_len &&
117	    os_memcmp(argv[id], user->identity, len) == 0 &&
118	    (user->password == NULL || len > user->password_len)) {
119		os_free(user->password);
120		user->password_len = os_strlen(argv[id]);
121		user->password = (u8 *) os_strdup(argv[id]);
122		user->next = (void *) 1;
123		set_user_methods(user, argv[methods]);
124	}
125
126	return 0;
127}
128
129
130static const struct hostapd_eap_user *
131eap_user_sqlite_get(struct hostapd_data *hapd, const u8 *identity,
132		    size_t identity_len, int phase2)
133{
134	sqlite3 *db;
135	struct hostapd_eap_user *user = NULL;
136	char id_str[256], cmd[300];
137	size_t i;
138
139	if (identity_len >= sizeof(id_str))
140		return NULL;
141	os_memcpy(id_str, identity, identity_len);
142	id_str[identity_len] = '\0';
143	for (i = 0; i < identity_len; i++) {
144		if (id_str[i] >= 'a' && id_str[i] <= 'z')
145			continue;
146		if (id_str[i] >= 'A' && id_str[i] <= 'Z')
147			continue;
148		if (id_str[i] >= '0' && id_str[i] <= '9')
149			continue;
150		if (id_str[i] == '-' || id_str[i] == '_' || id_str[i] == '.' ||
151		    id_str[i] == ',' || id_str[i] == '@' || id_str[i] == '\\' ||
152		    id_str[i] == '!' || id_str[i] == '#' || id_str[i] == '%' ||
153		    id_str[i] == '=' || id_str[i] == ' ')
154			continue;
155		wpa_printf(MSG_INFO, "DB: Unsupported character in identity");
156		return NULL;
157	}
158
159	os_free(hapd->tmp_eap_user.identity);
160	os_free(hapd->tmp_eap_user.password);
161	os_memset(&hapd->tmp_eap_user, 0, sizeof(hapd->tmp_eap_user));
162	hapd->tmp_eap_user.phase2 = phase2;
163	hapd->tmp_eap_user.identity = os_zalloc(identity_len + 1);
164	if (hapd->tmp_eap_user.identity == NULL)
165		return NULL;
166	os_memcpy(hapd->tmp_eap_user.identity, identity, identity_len);
167
168	if (sqlite3_open(hapd->conf->eap_user_sqlite, &db)) {
169		wpa_printf(MSG_INFO, "DB: Failed to open database %s: %s",
170			   hapd->conf->eap_user_sqlite, sqlite3_errmsg(db));
171		sqlite3_close(db);
172		return NULL;
173	}
174
175	os_snprintf(cmd, sizeof(cmd),
176		    "SELECT password,methods FROM users WHERE "
177		    "identity='%s' AND phase2=%d;", id_str, phase2);
178	wpa_printf(MSG_DEBUG, "DB: %s", cmd);
179	if (sqlite3_exec(db, cmd, get_user_cb, &hapd->tmp_eap_user, NULL) !=
180	    SQLITE_OK) {
181		wpa_printf(MSG_DEBUG, "DB: Failed to complete SQL operation");
182	} else if (hapd->tmp_eap_user.next)
183		user = &hapd->tmp_eap_user;
184
185	if (user == NULL && !phase2) {
186		os_snprintf(cmd, sizeof(cmd),
187			    "SELECT identity,methods FROM wildcards;");
188		wpa_printf(MSG_DEBUG, "DB: %s", cmd);
189		if (sqlite3_exec(db, cmd, get_wildcard_cb, &hapd->tmp_eap_user,
190				 NULL) != SQLITE_OK) {
191			wpa_printf(MSG_DEBUG, "DB: Failed to complete SQL "
192				   "operation");
193		} else if (hapd->tmp_eap_user.next) {
194			user = &hapd->tmp_eap_user;
195			os_free(user->identity);
196			user->identity = user->password;
197			user->identity_len = user->password_len;
198			user->password = NULL;
199			user->password_len = 0;
200		}
201	}
202
203	sqlite3_close(db);
204
205	return user;
206}
207
208#endif /* CONFIG_SQLITE */
209
210
211const struct hostapd_eap_user *
212hostapd_get_eap_user(struct hostapd_data *hapd, const u8 *identity,
213		     size_t identity_len, int phase2)
214{
215	const struct hostapd_bss_config *conf = hapd->conf;
216	struct hostapd_eap_user *user = conf->eap_user;
217
218#ifdef CONFIG_WPS
219	if (conf->wps_state && identity_len == WSC_ID_ENROLLEE_LEN &&
220	    os_memcmp(identity, WSC_ID_ENROLLEE, WSC_ID_ENROLLEE_LEN) == 0) {
221		static struct hostapd_eap_user wsc_enrollee;
222		os_memset(&wsc_enrollee, 0, sizeof(wsc_enrollee));
223		wsc_enrollee.methods[0].method = eap_server_get_type(
224			"WSC", &wsc_enrollee.methods[0].vendor);
225		return &wsc_enrollee;
226	}
227
228	if (conf->wps_state && identity_len == WSC_ID_REGISTRAR_LEN &&
229	    os_memcmp(identity, WSC_ID_REGISTRAR, WSC_ID_REGISTRAR_LEN) == 0) {
230		static struct hostapd_eap_user wsc_registrar;
231		os_memset(&wsc_registrar, 0, sizeof(wsc_registrar));
232		wsc_registrar.methods[0].method = eap_server_get_type(
233			"WSC", &wsc_registrar.methods[0].vendor);
234		wsc_registrar.password = (u8 *) conf->ap_pin;
235		wsc_registrar.password_len = conf->ap_pin ?
236			os_strlen(conf->ap_pin) : 0;
237		return &wsc_registrar;
238	}
239#endif /* CONFIG_WPS */
240
241	while (user) {
242		if (!phase2 && user->identity == NULL) {
243			/* Wildcard match */
244			break;
245		}
246
247		if (user->phase2 == !!phase2 && user->wildcard_prefix &&
248		    identity_len >= user->identity_len &&
249		    os_memcmp(user->identity, identity, user->identity_len) ==
250		    0) {
251			/* Wildcard prefix match */
252			break;
253		}
254
255		if (user->phase2 == !!phase2 &&
256		    user->identity_len == identity_len &&
257		    os_memcmp(user->identity, identity, identity_len) == 0)
258			break;
259		user = user->next;
260	}
261
262#ifdef CONFIG_SQLITE
263	if (user == NULL && conf->eap_user_sqlite) {
264		return eap_user_sqlite_get(hapd, identity, identity_len,
265					   phase2);
266	}
267#endif /* CONFIG_SQLITE */
268
269	return user;
270}
271