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1 | /* | |
2 | * hostapd / EAP-SIM database/authenticator gateway | |
3 | * Copyright (c) 2005-2010, 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 | * This is an example implementation of the EAP-SIM/AKA database/authentication | |
9 | * gateway interface that is using an external program as an SS7 gateway to | |
10 | * GSM/UMTS authentication center (HLR/AuC). hlr_auc_gw is an example | |
11 | * implementation of such a gateway program. This eap_sim_db.c takes care of | |
12 | * EAP-SIM/AKA pseudonyms and re-auth identities. It can be used with different | |
13 | * gateway implementations for HLR/AuC access. Alternatively, it can also be | |
14 | * completely replaced if the in-memory database of pseudonyms/re-auth | |
15 | * identities is not suitable for some cases. | |
16 | */ | |
17 | ||
18 | #include "includes.h" | |
19 | #include <sys/un.h> | |
20 | #ifdef CONFIG_SQLITE | |
21 | #include <sqlite3.h> | |
22 | #endif /* CONFIG_SQLITE */ | |
23 | ||
24 | #include "common.h" | |
25 | #include "crypto/random.h" | |
26 | #include "eap_common/eap_sim_common.h" | |
27 | #include "eap_server/eap_sim_db.h" | |
28 | #include "eloop.h" | |
29 | ||
30 | struct eap_sim_pseudonym { | |
31 | struct eap_sim_pseudonym *next; | |
32 | char *permanent; /* permanent username */ | |
33 | char *pseudonym; /* pseudonym username */ | |
34 | }; | |
35 | ||
36 | struct eap_sim_db_pending { | |
37 | struct eap_sim_db_pending *next; | |
38 | char imsi[20]; | |
39 | enum { PENDING, SUCCESS, FAILURE } state; | |
40 | void *cb_session_ctx; | |
41 | int aka; | |
42 | union { | |
43 | struct { | |
44 | u8 kc[EAP_SIM_MAX_CHAL][EAP_SIM_KC_LEN]; | |
45 | u8 sres[EAP_SIM_MAX_CHAL][EAP_SIM_SRES_LEN]; | |
46 | u8 rand[EAP_SIM_MAX_CHAL][GSM_RAND_LEN]; | |
47 | int num_chal; | |
48 | } sim; | |
49 | struct { | |
50 | u8 rand[EAP_AKA_RAND_LEN]; | |
51 | u8 autn[EAP_AKA_AUTN_LEN]; | |
52 | u8 ik[EAP_AKA_IK_LEN]; | |
53 | u8 ck[EAP_AKA_CK_LEN]; | |
54 | u8 res[EAP_AKA_RES_MAX_LEN]; | |
55 | size_t res_len; | |
56 | } aka; | |
57 | } u; | |
58 | }; | |
59 | ||
60 | struct eap_sim_db_data { | |
61 | int sock; | |
62 | char *fname; | |
63 | char *local_sock; | |
64 | void (*get_complete_cb)(void *ctx, void *session_ctx); | |
65 | void *ctx; | |
66 | struct eap_sim_pseudonym *pseudonyms; | |
67 | struct eap_sim_reauth *reauths; | |
68 | struct eap_sim_db_pending *pending; | |
69 | unsigned int eap_sim_db_timeout; | |
70 | #ifdef CONFIG_SQLITE | |
71 | sqlite3 *sqlite_db; | |
72 | char db_tmp_identity[100]; | |
73 | char db_tmp_pseudonym_str[100]; | |
74 | struct eap_sim_pseudonym db_tmp_pseudonym; | |
75 | struct eap_sim_reauth db_tmp_reauth; | |
76 | #endif /* CONFIG_SQLITE */ | |
77 | }; | |
78 | ||
79 | ||
80 | static void eap_sim_db_del_timeout(void *eloop_ctx, void *user_ctx); | |
81 | static void eap_sim_db_query_timeout(void *eloop_ctx, void *user_ctx); | |
82 | ||
83 | ||
84 | #ifdef CONFIG_SQLITE | |
85 | ||
86 | static int db_table_exists(sqlite3 *db, const char *name) | |
87 | { | |
88 | char cmd[128]; | |
89 | os_snprintf(cmd, sizeof(cmd), "SELECT 1 FROM %s;", name); | |
90 | return sqlite3_exec(db, cmd, NULL, NULL, NULL) == SQLITE_OK; | |
91 | } | |
92 | ||
93 | ||
94 | static int db_table_create_pseudonym(sqlite3 *db) | |
95 | { | |
96 | char *err = NULL; | |
97 | const char *sql = | |
98 | "CREATE TABLE pseudonyms(" | |
99 | " permanent CHAR(21) PRIMARY KEY," | |
100 | " pseudonym CHAR(21) NOT NULL" | |
101 | ");"; | |
102 | ||
103 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Adding database table for " | |
104 | "pseudonym information"); | |
105 | if (sqlite3_exec(db, sql, NULL, NULL, &err) != SQLITE_OK) { | |
106 | wpa_printf(MSG_ERROR, "EAP-SIM DB: SQLite error: %s", err); | |
107 | sqlite3_free(err); | |
108 | return -1; | |
109 | } | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
114 | ||
115 | static int db_table_create_reauth(sqlite3 *db) | |
116 | { | |
117 | char *err = NULL; | |
118 | const char *sql = | |
119 | "CREATE TABLE reauth(" | |
120 | " permanent CHAR(21) PRIMARY KEY," | |
121 | " reauth_id CHAR(21) NOT NULL," | |
122 | " counter INTEGER," | |
123 | " mk CHAR(40)," | |
124 | " k_encr CHAR(32)," | |
125 | " k_aut CHAR(64)," | |
126 | " k_re CHAR(64)" | |
127 | ");"; | |
128 | ||
129 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Adding database table for " | |
130 | "reauth information"); | |
131 | if (sqlite3_exec(db, sql, NULL, NULL, &err) != SQLITE_OK) { | |
132 | wpa_printf(MSG_ERROR, "EAP-SIM DB: SQLite error: %s", err); | |
133 | sqlite3_free(err); | |
134 | return -1; | |
135 | } | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | ||
141 | static sqlite3 * db_open(const char *db_file) | |
142 | { | |
143 | sqlite3 *db; | |
144 | ||
145 | if (sqlite3_open(db_file, &db)) { | |
146 | wpa_printf(MSG_ERROR, "EAP-SIM DB: Failed to open database " | |
147 | "%s: %s", db_file, sqlite3_errmsg(db)); | |
148 | sqlite3_close(db); | |
149 | return NULL; | |
150 | } | |
151 | ||
152 | if (!db_table_exists(db, "pseudonyms") && | |
153 | db_table_create_pseudonym(db) < 0) { | |
154 | sqlite3_close(db); | |
155 | return NULL; | |
156 | } | |
157 | ||
158 | if (!db_table_exists(db, "reauth") && | |
159 | db_table_create_reauth(db) < 0) { | |
160 | sqlite3_close(db); | |
161 | return NULL; | |
162 | } | |
163 | ||
164 | return db; | |
165 | } | |
166 | ||
167 | ||
168 | static int valid_db_string(const char *str) | |
169 | { | |
170 | const char *pos = str; | |
171 | while (*pos) { | |
172 | if ((*pos < '0' || *pos > '9') && | |
173 | (*pos < 'a' || *pos > 'f')) | |
174 | return 0; | |
175 | pos++; | |
176 | } | |
177 | return 1; | |
178 | } | |
179 | ||
180 | ||
181 | static int db_add_pseudonym(struct eap_sim_db_data *data, | |
182 | const char *permanent, char *pseudonym) | |
183 | { | |
184 | char cmd[128]; | |
185 | char *err = NULL; | |
186 | ||
187 | if (!valid_db_string(permanent) || !valid_db_string(pseudonym)) { | |
188 | os_free(pseudonym); | |
189 | return -1; | |
190 | } | |
191 | ||
192 | os_snprintf(cmd, sizeof(cmd), "INSERT OR REPLACE INTO pseudonyms " | |
193 | "(permanent, pseudonym) VALUES ('%s', '%s');", | |
194 | permanent, pseudonym); | |
195 | os_free(pseudonym); | |
196 | if (sqlite3_exec(data->sqlite_db, cmd, NULL, NULL, &err) != SQLITE_OK) | |
197 | { | |
198 | wpa_printf(MSG_ERROR, "EAP-SIM DB: SQLite error: %s", err); | |
199 | sqlite3_free(err); | |
200 | return -1; | |
201 | } | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
206 | ||
207 | static int get_pseudonym_cb(void *ctx, int argc, char *argv[], char *col[]) | |
208 | { | |
209 | struct eap_sim_db_data *data = ctx; | |
210 | int i; | |
211 | ||
212 | for (i = 0; i < argc; i++) { | |
213 | if (os_strcmp(col[i], "permanent") == 0 && argv[i]) { | |
214 | os_strlcpy(data->db_tmp_identity, argv[i], | |
215 | sizeof(data->db_tmp_identity)); | |
216 | } | |
217 | } | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | ||
223 | static char * | |
224 | db_get_pseudonym(struct eap_sim_db_data *data, const char *pseudonym) | |
225 | { | |
226 | char cmd[128]; | |
227 | ||
228 | if (!valid_db_string(pseudonym)) | |
229 | return NULL; | |
230 | os_memset(&data->db_tmp_identity, 0, sizeof(data->db_tmp_identity)); | |
231 | os_snprintf(cmd, sizeof(cmd), | |
232 | "SELECT permanent FROM pseudonyms WHERE pseudonym='%s';", | |
233 | pseudonym); | |
234 | if (sqlite3_exec(data->sqlite_db, cmd, get_pseudonym_cb, data, NULL) != | |
235 | SQLITE_OK) | |
236 | return NULL; | |
237 | if (data->db_tmp_identity[0] == '\0') | |
238 | return NULL; | |
239 | return data->db_tmp_identity; | |
240 | } | |
241 | ||
242 | ||
243 | static int db_add_reauth(struct eap_sim_db_data *data, const char *permanent, | |
244 | char *reauth_id, u16 counter, const u8 *mk, | |
245 | const u8 *k_encr, const u8 *k_aut, const u8 *k_re) | |
246 | { | |
247 | char cmd[2000], *pos, *end; | |
248 | char *err = NULL; | |
249 | ||
250 | if (!valid_db_string(permanent) || !valid_db_string(reauth_id)) { | |
251 | os_free(reauth_id); | |
252 | return -1; | |
253 | } | |
254 | ||
255 | pos = cmd; | |
256 | end = pos + sizeof(cmd); | |
257 | pos += os_snprintf(pos, end - pos, "INSERT OR REPLACE INTO reauth " | |
258 | "(permanent, reauth_id, counter%s%s%s%s) " | |
259 | "VALUES ('%s', '%s', %u", | |
260 | mk ? ", mk" : "", | |
261 | k_encr ? ", k_encr" : "", | |
262 | k_aut ? ", k_aut" : "", | |
263 | k_re ? ", k_re" : "", | |
264 | permanent, reauth_id, counter); | |
265 | os_free(reauth_id); | |
266 | ||
267 | if (mk) { | |
268 | pos += os_snprintf(pos, end - pos, ", '"); | |
269 | pos += wpa_snprintf_hex(pos, end - pos, mk, EAP_SIM_MK_LEN); | |
270 | pos += os_snprintf(pos, end - pos, "'"); | |
271 | } | |
272 | ||
273 | if (k_encr) { | |
274 | pos += os_snprintf(pos, end - pos, ", '"); | |
275 | pos += wpa_snprintf_hex(pos, end - pos, k_encr, | |
276 | EAP_SIM_K_ENCR_LEN); | |
277 | pos += os_snprintf(pos, end - pos, "'"); | |
278 | } | |
279 | ||
280 | if (k_aut) { | |
281 | pos += os_snprintf(pos, end - pos, ", '"); | |
282 | pos += wpa_snprintf_hex(pos, end - pos, k_aut, | |
283 | EAP_AKA_PRIME_K_AUT_LEN); | |
284 | pos += os_snprintf(pos, end - pos, "'"); | |
285 | } | |
286 | ||
287 | if (k_re) { | |
288 | pos += os_snprintf(pos, end - pos, ", '"); | |
289 | pos += wpa_snprintf_hex(pos, end - pos, k_re, | |
290 | EAP_AKA_PRIME_K_RE_LEN); | |
291 | pos += os_snprintf(pos, end - pos, "'"); | |
292 | } | |
293 | ||
294 | os_snprintf(pos, end - pos, ");"); | |
295 | ||
296 | if (sqlite3_exec(data->sqlite_db, cmd, NULL, NULL, &err) != SQLITE_OK) | |
297 | { | |
298 | wpa_printf(MSG_ERROR, "EAP-SIM DB: SQLite error: %s", err); | |
299 | sqlite3_free(err); | |
300 | return -1; | |
301 | } | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | ||
307 | static int get_reauth_cb(void *ctx, int argc, char *argv[], char *col[]) | |
308 | { | |
309 | struct eap_sim_db_data *data = ctx; | |
310 | int i; | |
311 | struct eap_sim_reauth *reauth = &data->db_tmp_reauth; | |
312 | ||
313 | for (i = 0; i < argc; i++) { | |
314 | if (os_strcmp(col[i], "permanent") == 0 && argv[i]) { | |
315 | os_strlcpy(data->db_tmp_identity, argv[i], | |
316 | sizeof(data->db_tmp_identity)); | |
317 | reauth->permanent = data->db_tmp_identity; | |
318 | } else if (os_strcmp(col[i], "counter") == 0 && argv[i]) { | |
319 | reauth->counter = atoi(argv[i]); | |
320 | } else if (os_strcmp(col[i], "mk") == 0 && argv[i]) { | |
321 | hexstr2bin(argv[i], reauth->mk, sizeof(reauth->mk)); | |
322 | } else if (os_strcmp(col[i], "k_encr") == 0 && argv[i]) { | |
323 | hexstr2bin(argv[i], reauth->k_encr, | |
324 | sizeof(reauth->k_encr)); | |
325 | } else if (os_strcmp(col[i], "k_aut") == 0 && argv[i]) { | |
326 | hexstr2bin(argv[i], reauth->k_aut, | |
327 | sizeof(reauth->k_aut)); | |
328 | } else if (os_strcmp(col[i], "k_re") == 0 && argv[i]) { | |
329 | hexstr2bin(argv[i], reauth->k_re, | |
330 | sizeof(reauth->k_re)); | |
331 | } | |
332 | } | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | ||
338 | static struct eap_sim_reauth * | |
339 | db_get_reauth(struct eap_sim_db_data *data, const char *reauth_id) | |
340 | { | |
341 | char cmd[256]; | |
342 | ||
343 | if (!valid_db_string(reauth_id)) | |
344 | return NULL; | |
345 | os_memset(&data->db_tmp_reauth, 0, sizeof(data->db_tmp_reauth)); | |
346 | os_strlcpy(data->db_tmp_pseudonym_str, reauth_id, | |
347 | sizeof(data->db_tmp_pseudonym_str)); | |
348 | data->db_tmp_reauth.reauth_id = data->db_tmp_pseudonym_str; | |
349 | os_snprintf(cmd, sizeof(cmd), | |
350 | "SELECT * FROM reauth WHERE reauth_id='%s';", reauth_id); | |
351 | if (sqlite3_exec(data->sqlite_db, cmd, get_reauth_cb, data, NULL) != | |
352 | SQLITE_OK) | |
353 | return NULL; | |
354 | if (data->db_tmp_reauth.permanent == NULL) | |
355 | return NULL; | |
356 | return &data->db_tmp_reauth; | |
357 | } | |
358 | ||
359 | ||
360 | static void db_remove_reauth(struct eap_sim_db_data *data, | |
361 | struct eap_sim_reauth *reauth) | |
362 | { | |
363 | char cmd[256]; | |
364 | ||
365 | if (!valid_db_string(reauth->permanent)) | |
366 | return; | |
367 | os_snprintf(cmd, sizeof(cmd), | |
368 | "DELETE FROM reauth WHERE permanent='%s';", | |
369 | reauth->permanent); | |
370 | sqlite3_exec(data->sqlite_db, cmd, NULL, NULL, NULL); | |
371 | } | |
372 | ||
373 | #endif /* CONFIG_SQLITE */ | |
374 | ||
375 | ||
376 | static struct eap_sim_db_pending * | |
377 | eap_sim_db_get_pending(struct eap_sim_db_data *data, const char *imsi, int aka) | |
378 | { | |
379 | struct eap_sim_db_pending *entry, *prev = NULL; | |
380 | ||
381 | entry = data->pending; | |
382 | while (entry) { | |
383 | if (entry->aka == aka && os_strcmp(entry->imsi, imsi) == 0) { | |
384 | if (prev) | |
385 | prev->next = entry->next; | |
386 | else | |
387 | data->pending = entry->next; | |
388 | break; | |
389 | } | |
390 | prev = entry; | |
391 | entry = entry->next; | |
392 | } | |
393 | return entry; | |
394 | } | |
395 | ||
396 | ||
397 | static void eap_sim_db_add_pending(struct eap_sim_db_data *data, | |
398 | struct eap_sim_db_pending *entry) | |
399 | { | |
400 | entry->next = data->pending; | |
401 | data->pending = entry; | |
402 | } | |
403 | ||
404 | ||
405 | static void eap_sim_db_free_pending(struct eap_sim_db_data *data, | |
406 | struct eap_sim_db_pending *entry) | |
407 | { | |
408 | eloop_cancel_timeout(eap_sim_db_query_timeout, data, entry); | |
409 | eloop_cancel_timeout(eap_sim_db_del_timeout, data, entry); | |
410 | os_free(entry); | |
411 | } | |
412 | ||
413 | ||
414 | static void eap_sim_db_del_pending(struct eap_sim_db_data *data, | |
415 | struct eap_sim_db_pending *entry) | |
416 | { | |
417 | struct eap_sim_db_pending **pp = &data->pending; | |
418 | ||
419 | while (*pp != NULL) { | |
420 | if (*pp == entry) { | |
421 | *pp = entry->next; | |
422 | eap_sim_db_free_pending(data, entry); | |
423 | return; | |
424 | } | |
425 | pp = &(*pp)->next; | |
426 | } | |
427 | } | |
428 | ||
429 | ||
430 | static void eap_sim_db_del_timeout(void *eloop_ctx, void *user_ctx) | |
431 | { | |
432 | struct eap_sim_db_data *data = eloop_ctx; | |
433 | struct eap_sim_db_pending *entry = user_ctx; | |
434 | ||
435 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Delete query timeout for %p", entry); | |
436 | eap_sim_db_del_pending(data, entry); | |
437 | } | |
438 | ||
439 | ||
440 | static void eap_sim_db_query_timeout(void *eloop_ctx, void *user_ctx) | |
441 | { | |
442 | struct eap_sim_db_data *data = eloop_ctx; | |
443 | struct eap_sim_db_pending *entry = user_ctx; | |
444 | ||
445 | /* | |
446 | * Report failure and allow some time for EAP server to process it | |
447 | * before deleting the query. | |
448 | */ | |
449 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Query timeout for %p", entry); | |
450 | entry->state = FAILURE; | |
451 | data->get_complete_cb(data->ctx, entry->cb_session_ctx); | |
452 | eloop_register_timeout(1, 0, eap_sim_db_del_timeout, data, entry); | |
453 | } | |
454 | ||
455 | ||
456 | static void eap_sim_db_sim_resp_auth(struct eap_sim_db_data *data, | |
457 | const char *imsi, char *buf) | |
458 | { | |
459 | char *start, *end, *pos; | |
460 | struct eap_sim_db_pending *entry; | |
461 | int num_chal; | |
462 | ||
463 | /* | |
464 | * SIM-RESP-AUTH <IMSI> Kc(i):SRES(i):RAND(i) ... | |
465 | * SIM-RESP-AUTH <IMSI> FAILURE | |
466 | * (IMSI = ASCII string, Kc/SRES/RAND = hex string) | |
467 | */ | |
468 | ||
469 | entry = eap_sim_db_get_pending(data, imsi, 0); | |
470 | if (entry == NULL) { | |
471 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: No pending entry for the " | |
472 | "received message found"); | |
473 | return; | |
474 | } | |
475 | ||
476 | start = buf; | |
477 | if (os_strncmp(start, "FAILURE", 7) == 0) { | |
478 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: External server reported " | |
479 | "failure"); | |
480 | entry->state = FAILURE; | |
481 | eap_sim_db_add_pending(data, entry); | |
482 | data->get_complete_cb(data->ctx, entry->cb_session_ctx); | |
483 | return; | |
484 | } | |
485 | ||
486 | num_chal = 0; | |
487 | while (num_chal < EAP_SIM_MAX_CHAL) { | |
488 | end = os_strchr(start, ' '); | |
489 | if (end) | |
490 | *end = '\0'; | |
491 | ||
492 | pos = os_strchr(start, ':'); | |
493 | if (pos == NULL) | |
494 | goto parse_fail; | |
495 | *pos = '\0'; | |
496 | if (hexstr2bin(start, entry->u.sim.kc[num_chal], | |
497 | EAP_SIM_KC_LEN)) | |
498 | goto parse_fail; | |
499 | ||
500 | start = pos + 1; | |
501 | pos = os_strchr(start, ':'); | |
502 | if (pos == NULL) | |
503 | goto parse_fail; | |
504 | *pos = '\0'; | |
505 | if (hexstr2bin(start, entry->u.sim.sres[num_chal], | |
506 | EAP_SIM_SRES_LEN)) | |
507 | goto parse_fail; | |
508 | ||
509 | start = pos + 1; | |
510 | if (hexstr2bin(start, entry->u.sim.rand[num_chal], | |
511 | GSM_RAND_LEN)) | |
512 | goto parse_fail; | |
513 | ||
514 | num_chal++; | |
515 | if (end == NULL) | |
516 | break; | |
517 | else | |
518 | start = end + 1; | |
519 | } | |
520 | entry->u.sim.num_chal = num_chal; | |
521 | ||
522 | entry->state = SUCCESS; | |
523 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Authentication data parsed " | |
524 | "successfully - callback"); | |
525 | eap_sim_db_add_pending(data, entry); | |
526 | data->get_complete_cb(data->ctx, entry->cb_session_ctx); | |
527 | return; | |
528 | ||
529 | parse_fail: | |
530 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Failed to parse response string"); | |
531 | eap_sim_db_free_pending(data, entry); | |
532 | } | |
533 | ||
534 | ||
535 | static void eap_sim_db_aka_resp_auth(struct eap_sim_db_data *data, | |
536 | const char *imsi, char *buf) | |
537 | { | |
538 | char *start, *end; | |
539 | struct eap_sim_db_pending *entry; | |
540 | ||
541 | /* | |
542 | * AKA-RESP-AUTH <IMSI> <RAND> <AUTN> <IK> <CK> <RES> | |
543 | * AKA-RESP-AUTH <IMSI> FAILURE | |
544 | * (IMSI = ASCII string, RAND/AUTN/IK/CK/RES = hex string) | |
545 | */ | |
546 | ||
547 | entry = eap_sim_db_get_pending(data, imsi, 1); | |
548 | if (entry == NULL) { | |
549 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: No pending entry for the " | |
550 | "received message found"); | |
551 | return; | |
552 | } | |
553 | ||
554 | start = buf; | |
555 | if (os_strncmp(start, "FAILURE", 7) == 0) { | |
556 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: External server reported " | |
557 | "failure"); | |
558 | entry->state = FAILURE; | |
559 | eap_sim_db_add_pending(data, entry); | |
560 | data->get_complete_cb(data->ctx, entry->cb_session_ctx); | |
561 | return; | |
562 | } | |
563 | ||
564 | end = os_strchr(start, ' '); | |
565 | if (end == NULL) | |
566 | goto parse_fail; | |
567 | *end = '\0'; | |
568 | if (hexstr2bin(start, entry->u.aka.rand, EAP_AKA_RAND_LEN)) | |
569 | goto parse_fail; | |
570 | ||
571 | start = end + 1; | |
572 | end = os_strchr(start, ' '); | |
573 | if (end == NULL) | |
574 | goto parse_fail; | |
575 | *end = '\0'; | |
576 | if (hexstr2bin(start, entry->u.aka.autn, EAP_AKA_AUTN_LEN)) | |
577 | goto parse_fail; | |
578 | ||
579 | start = end + 1; | |
580 | end = os_strchr(start, ' '); | |
581 | if (end == NULL) | |
582 | goto parse_fail; | |
583 | *end = '\0'; | |
584 | if (hexstr2bin(start, entry->u.aka.ik, EAP_AKA_IK_LEN)) | |
585 | goto parse_fail; | |
586 | ||
587 | start = end + 1; | |
588 | end = os_strchr(start, ' '); | |
589 | if (end == NULL) | |
590 | goto parse_fail; | |
591 | *end = '\0'; | |
592 | if (hexstr2bin(start, entry->u.aka.ck, EAP_AKA_CK_LEN)) | |
593 | goto parse_fail; | |
594 | ||
595 | start = end + 1; | |
596 | end = os_strchr(start, ' '); | |
597 | if (end) | |
598 | *end = '\0'; | |
599 | else { | |
600 | end = start; | |
601 | while (*end) | |
602 | end++; | |
603 | } | |
604 | entry->u.aka.res_len = (end - start) / 2; | |
605 | if (entry->u.aka.res_len > EAP_AKA_RES_MAX_LEN) { | |
606 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Too long RES"); | |
607 | entry->u.aka.res_len = 0; | |
608 | goto parse_fail; | |
609 | } | |
610 | if (hexstr2bin(start, entry->u.aka.res, entry->u.aka.res_len)) | |
611 | goto parse_fail; | |
612 | ||
613 | entry->state = SUCCESS; | |
614 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Authentication data parsed " | |
615 | "successfully - callback"); | |
616 | eap_sim_db_add_pending(data, entry); | |
617 | data->get_complete_cb(data->ctx, entry->cb_session_ctx); | |
618 | return; | |
619 | ||
620 | parse_fail: | |
621 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Failed to parse response string"); | |
622 | eap_sim_db_free_pending(data, entry); | |
623 | } | |
624 | ||
625 | ||
626 | static void eap_sim_db_receive(int sock, void *eloop_ctx, void *sock_ctx) | |
627 | { | |
628 | struct eap_sim_db_data *data = eloop_ctx; | |
629 | char buf[1000], *pos, *cmd, *imsi; | |
630 | int res; | |
631 | ||
632 | res = recv(sock, buf, sizeof(buf) - 1, 0); | |
633 | if (res < 0) | |
634 | return; | |
635 | buf[res] = '\0'; | |
636 | wpa_hexdump_ascii_key(MSG_MSGDUMP, "EAP-SIM DB: Received from an " | |
637 | "external source", (u8 *) buf, res); | |
638 | if (res == 0) | |
639 | return; | |
640 | ||
641 | if (data->get_complete_cb == NULL) { | |
642 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: No get_complete_cb " | |
643 | "registered"); | |
644 | return; | |
645 | } | |
646 | ||
647 | /* <cmd> <IMSI> ... */ | |
648 | ||
649 | cmd = buf; | |
650 | pos = os_strchr(cmd, ' '); | |
651 | if (pos == NULL) | |
652 | goto parse_fail; | |
653 | *pos = '\0'; | |
654 | imsi = pos + 1; | |
655 | pos = os_strchr(imsi, ' '); | |
656 | if (pos == NULL) | |
657 | goto parse_fail; | |
658 | *pos = '\0'; | |
659 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: External response=%s for IMSI %s", | |
660 | cmd, imsi); | |
661 | ||
662 | if (os_strcmp(cmd, "SIM-RESP-AUTH") == 0) | |
663 | eap_sim_db_sim_resp_auth(data, imsi, pos + 1); | |
664 | else if (os_strcmp(cmd, "AKA-RESP-AUTH") == 0) | |
665 | eap_sim_db_aka_resp_auth(data, imsi, pos + 1); | |
666 | else | |
667 | wpa_printf(MSG_INFO, "EAP-SIM DB: Unknown external response " | |
668 | "'%s'", cmd); | |
669 | return; | |
670 | ||
671 | parse_fail: | |
672 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Failed to parse response string"); | |
673 | } | |
674 | ||
675 | ||
676 | static int eap_sim_db_open_socket(struct eap_sim_db_data *data) | |
677 | { | |
678 | struct sockaddr_un addr; | |
679 | static int counter = 0; | |
680 | ||
681 | if (os_strncmp(data->fname, "unix:", 5) != 0) | |
682 | return -1; | |
683 | ||
684 | data->sock = socket(PF_UNIX, SOCK_DGRAM, 0); | |
685 | if (data->sock < 0) { | |
686 | wpa_printf(MSG_INFO, "socket(eap_sim_db): %s", strerror(errno)); | |
687 | return -1; | |
688 | } | |
689 | ||
690 | os_memset(&addr, 0, sizeof(addr)); | |
691 | addr.sun_family = AF_UNIX; | |
692 | os_snprintf(addr.sun_path, sizeof(addr.sun_path), | |
693 | "/tmp/eap_sim_db_%d-%d", getpid(), counter++); | |
694 | os_free(data->local_sock); | |
695 | data->local_sock = os_strdup(addr.sun_path); | |
696 | if (data->local_sock == NULL) { | |
697 | close(data->sock); | |
698 | data->sock = -1; | |
699 | return -1; | |
700 | } | |
701 | if (bind(data->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) { | |
702 | wpa_printf(MSG_INFO, "bind(eap_sim_db): %s", strerror(errno)); | |
703 | close(data->sock); | |
704 | data->sock = -1; | |
705 | return -1; | |
706 | } | |
707 | ||
708 | os_memset(&addr, 0, sizeof(addr)); | |
709 | addr.sun_family = AF_UNIX; | |
710 | os_strlcpy(addr.sun_path, data->fname + 5, sizeof(addr.sun_path)); | |
711 | if (connect(data->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) { | |
712 | wpa_printf(MSG_INFO, "connect(eap_sim_db): %s", | |
713 | strerror(errno)); | |
714 | wpa_hexdump_ascii(MSG_INFO, "HLR/AuC GW socket", | |
715 | (u8 *) addr.sun_path, | |
716 | os_strlen(addr.sun_path)); | |
717 | close(data->sock); | |
718 | data->sock = -1; | |
719 | unlink(data->local_sock); | |
720 | os_free(data->local_sock); | |
721 | data->local_sock = NULL; | |
722 | return -1; | |
723 | } | |
724 | ||
725 | eloop_register_read_sock(data->sock, eap_sim_db_receive, data, NULL); | |
726 | ||
727 | return 0; | |
728 | } | |
729 | ||
730 | ||
731 | static void eap_sim_db_close_socket(struct eap_sim_db_data *data) | |
732 | { | |
733 | if (data->sock >= 0) { | |
734 | eloop_unregister_read_sock(data->sock); | |
735 | close(data->sock); | |
736 | data->sock = -1; | |
737 | } | |
738 | if (data->local_sock) { | |
739 | unlink(data->local_sock); | |
740 | os_free(data->local_sock); | |
741 | data->local_sock = NULL; | |
742 | } | |
743 | } | |
744 | ||
745 | ||
746 | /** | |
747 | * eap_sim_db_init - Initialize EAP-SIM DB / authentication gateway interface | |
748 | * @config: Configuration data (e.g., file name) | |
749 | * @db_timeout: Database lookup timeout | |
750 | * @get_complete_cb: Callback function for reporting availability of triplets | |
751 | * @ctx: Context pointer for get_complete_cb | |
752 | * Returns: Pointer to a private data structure or %NULL on failure | |
753 | */ | |
754 | struct eap_sim_db_data * | |
755 | eap_sim_db_init(const char *config, unsigned int db_timeout, | |
756 | void (*get_complete_cb)(void *ctx, void *session_ctx), | |
757 | void *ctx) | |
758 | { | |
759 | struct eap_sim_db_data *data; | |
760 | char *pos; | |
761 | ||
762 | data = os_zalloc(sizeof(*data)); | |
763 | if (data == NULL) | |
764 | return NULL; | |
765 | ||
766 | data->sock = -1; | |
767 | data->get_complete_cb = get_complete_cb; | |
768 | data->ctx = ctx; | |
769 | data->eap_sim_db_timeout = db_timeout; | |
770 | data->fname = os_strdup(config); | |
771 | if (data->fname == NULL) | |
772 | goto fail; | |
773 | pos = os_strstr(data->fname, " db="); | |
774 | if (pos) { | |
775 | *pos = '\0'; | |
776 | #ifdef CONFIG_SQLITE | |
777 | pos += 4; | |
778 | data->sqlite_db = db_open(pos); | |
779 | if (data->sqlite_db == NULL) | |
780 | goto fail; | |
781 | #endif /* CONFIG_SQLITE */ | |
782 | } | |
783 | ||
784 | if (os_strncmp(data->fname, "unix:", 5) == 0) { | |
785 | if (eap_sim_db_open_socket(data)) { | |
786 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: External database " | |
787 | "connection not available - will retry " | |
788 | "later"); | |
789 | } | |
790 | } | |
791 | ||
792 | return data; | |
793 | ||
794 | fail: | |
795 | eap_sim_db_close_socket(data); | |
796 | os_free(data->fname); | |
797 | os_free(data); | |
798 | return NULL; | |
799 | } | |
800 | ||
801 | ||
802 | static void eap_sim_db_free_pseudonym(struct eap_sim_pseudonym *p) | |
803 | { | |
804 | os_free(p->permanent); | |
805 | os_free(p->pseudonym); | |
806 | os_free(p); | |
807 | } | |
808 | ||
809 | ||
810 | static void eap_sim_db_free_reauth(struct eap_sim_reauth *r) | |
811 | { | |
812 | os_free(r->permanent); | |
813 | os_free(r->reauth_id); | |
814 | os_free(r); | |
815 | } | |
816 | ||
817 | ||
818 | /** | |
819 | * eap_sim_db_deinit - Deinitialize EAP-SIM DB/authentication gw interface | |
820 | * @priv: Private data pointer from eap_sim_db_init() | |
821 | */ | |
822 | void eap_sim_db_deinit(void *priv) | |
823 | { | |
824 | struct eap_sim_db_data *data = priv; | |
825 | struct eap_sim_pseudonym *p, *prev; | |
826 | struct eap_sim_reauth *r, *prevr; | |
827 | struct eap_sim_db_pending *pending, *prev_pending; | |
828 | ||
829 | #ifdef CONFIG_SQLITE | |
830 | if (data->sqlite_db) { | |
831 | sqlite3_close(data->sqlite_db); | |
832 | data->sqlite_db = NULL; | |
833 | } | |
834 | #endif /* CONFIG_SQLITE */ | |
835 | ||
836 | eap_sim_db_close_socket(data); | |
837 | os_free(data->fname); | |
838 | ||
839 | p = data->pseudonyms; | |
840 | while (p) { | |
841 | prev = p; | |
842 | p = p->next; | |
843 | eap_sim_db_free_pseudonym(prev); | |
844 | } | |
845 | ||
846 | r = data->reauths; | |
847 | while (r) { | |
848 | prevr = r; | |
849 | r = r->next; | |
850 | eap_sim_db_free_reauth(prevr); | |
851 | } | |
852 | ||
853 | pending = data->pending; | |
854 | while (pending) { | |
855 | prev_pending = pending; | |
856 | pending = pending->next; | |
857 | eap_sim_db_free_pending(data, prev_pending); | |
858 | } | |
859 | ||
860 | os_free(data); | |
861 | } | |
862 | ||
863 | ||
864 | static int eap_sim_db_send(struct eap_sim_db_data *data, const char *msg, | |
865 | size_t len) | |
866 | { | |
867 | int _errno = 0; | |
868 | ||
869 | if (send(data->sock, msg, len, 0) < 0) { | |
870 | _errno = errno; | |
871 | wpa_printf(MSG_INFO, "send[EAP-SIM DB UNIX]: %s", | |
872 | strerror(errno)); | |
873 | } | |
874 | ||
875 | if (_errno == ENOTCONN || _errno == EDESTADDRREQ || _errno == EINVAL || | |
876 | _errno == ECONNREFUSED) { | |
877 | /* Try to reconnect */ | |
878 | eap_sim_db_close_socket(data); | |
879 | if (eap_sim_db_open_socket(data) < 0) | |
880 | return -1; | |
881 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Reconnected to the " | |
882 | "external server"); | |
883 | if (send(data->sock, msg, len, 0) < 0) { | |
884 | wpa_printf(MSG_INFO, "send[EAP-SIM DB UNIX]: %s", | |
885 | strerror(errno)); | |
886 | return -1; | |
887 | } | |
888 | } | |
889 | ||
890 | return 0; | |
891 | } | |
892 | ||
893 | ||
894 | static void eap_sim_db_expire_pending(struct eap_sim_db_data *data, | |
895 | struct eap_sim_db_pending *entry) | |
896 | { | |
897 | eloop_register_timeout(data->eap_sim_db_timeout, 0, | |
898 | eap_sim_db_query_timeout, data, entry); | |
899 | } | |
900 | ||
901 | ||
902 | /** | |
903 | * eap_sim_db_get_gsm_triplets - Get GSM triplets | |
904 | * @data: Private data pointer from eap_sim_db_init() | |
905 | * @username: Permanent username (prefix | IMSI) | |
906 | * @max_chal: Maximum number of triplets | |
907 | * @_rand: Buffer for RAND values | |
908 | * @kc: Buffer for Kc values | |
909 | * @sres: Buffer for SRES values | |
910 | * @cb_session_ctx: Session callback context for get_complete_cb() | |
911 | * Returns: Number of triplets received (has to be less than or equal to | |
912 | * max_chal), -1 (EAP_SIM_DB_FAILURE) on error (e.g., user not found), or | |
913 | * -2 (EAP_SIM_DB_PENDING) if results are not yet available. In this case, the | |
914 | * callback function registered with eap_sim_db_init() will be called once the | |
915 | * results become available. | |
916 | * | |
917 | * When using an external server for GSM triplets, this function can always | |
918 | * start a request and return EAP_SIM_DB_PENDING immediately if authentication | |
919 | * triplets are not available. Once the triplets are received, callback | |
920 | * function registered with eap_sim_db_init() is called to notify EAP state | |
921 | * machine to reprocess the message. This eap_sim_db_get_gsm_triplets() | |
922 | * function will then be called again and the newly received triplets will then | |
923 | * be given to the caller. | |
924 | */ | |
925 | int eap_sim_db_get_gsm_triplets(struct eap_sim_db_data *data, | |
926 | const char *username, int max_chal, | |
927 | u8 *_rand, u8 *kc, u8 *sres, | |
928 | void *cb_session_ctx) | |
929 | { | |
930 | struct eap_sim_db_pending *entry; | |
931 | int len, ret; | |
932 | char msg[40]; | |
933 | const char *imsi; | |
934 | size_t imsi_len; | |
935 | ||
936 | if (username == NULL || username[0] != EAP_SIM_PERMANENT_PREFIX || | |
937 | username[1] == '\0' || os_strlen(username) > sizeof(entry->imsi)) { | |
938 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: unexpected username '%s'", | |
939 | username); | |
940 | return EAP_SIM_DB_FAILURE; | |
941 | } | |
942 | imsi = username + 1; | |
943 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Get GSM triplets for IMSI '%s'", | |
944 | imsi); | |
945 | ||
946 | entry = eap_sim_db_get_pending(data, imsi, 0); | |
947 | if (entry) { | |
948 | int num_chal; | |
949 | if (entry->state == FAILURE) { | |
950 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Pending entry -> " | |
951 | "failure"); | |
952 | eap_sim_db_free_pending(data, entry); | |
953 | return EAP_SIM_DB_FAILURE; | |
954 | } | |
955 | ||
956 | if (entry->state == PENDING) { | |
957 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Pending entry -> " | |
958 | "still pending"); | |
959 | eap_sim_db_add_pending(data, entry); | |
960 | return EAP_SIM_DB_PENDING; | |
961 | } | |
962 | ||
963 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Pending entry -> " | |
964 | "%d challenges", entry->u.sim.num_chal); | |
965 | num_chal = entry->u.sim.num_chal; | |
966 | if (num_chal > max_chal) | |
967 | num_chal = max_chal; | |
968 | os_memcpy(_rand, entry->u.sim.rand, num_chal * GSM_RAND_LEN); | |
969 | os_memcpy(sres, entry->u.sim.sres, | |
970 | num_chal * EAP_SIM_SRES_LEN); | |
971 | os_memcpy(kc, entry->u.sim.kc, num_chal * EAP_SIM_KC_LEN); | |
972 | eap_sim_db_free_pending(data, entry); | |
973 | return num_chal; | |
974 | } | |
975 | ||
976 | if (data->sock < 0) { | |
977 | if (eap_sim_db_open_socket(data) < 0) | |
978 | return EAP_SIM_DB_FAILURE; | |
979 | } | |
980 | ||
981 | imsi_len = os_strlen(imsi); | |
982 | len = os_snprintf(msg, sizeof(msg), "SIM-REQ-AUTH "); | |
983 | if (os_snprintf_error(sizeof(msg), len) || | |
984 | len + imsi_len >= sizeof(msg)) | |
985 | return EAP_SIM_DB_FAILURE; | |
986 | os_memcpy(msg + len, imsi, imsi_len); | |
987 | len += imsi_len; | |
988 | ret = os_snprintf(msg + len, sizeof(msg) - len, " %d", max_chal); | |
989 | if (os_snprintf_error(sizeof(msg) - len, ret)) | |
990 | return EAP_SIM_DB_FAILURE; | |
991 | len += ret; | |
992 | ||
993 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: requesting SIM authentication " | |
994 | "data for IMSI '%s'", imsi); | |
995 | if (eap_sim_db_send(data, msg, len) < 0) | |
996 | return EAP_SIM_DB_FAILURE; | |
997 | ||
998 | entry = os_zalloc(sizeof(*entry)); | |
999 | if (entry == NULL) | |
1000 | return EAP_SIM_DB_FAILURE; | |
1001 | ||
1002 | os_strlcpy(entry->imsi, imsi, sizeof(entry->imsi)); | |
1003 | entry->cb_session_ctx = cb_session_ctx; | |
1004 | entry->state = PENDING; | |
1005 | eap_sim_db_add_pending(data, entry); | |
1006 | eap_sim_db_expire_pending(data, entry); | |
1007 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Added query %p", entry); | |
1008 | ||
1009 | return EAP_SIM_DB_PENDING; | |
1010 | } | |
1011 | ||
1012 | ||
1013 | static char * eap_sim_db_get_next(struct eap_sim_db_data *data, char prefix) | |
1014 | { | |
1015 | char *id, *pos, *end; | |
1016 | u8 buf[10]; | |
1017 | ||
1018 | if (random_get_bytes(buf, sizeof(buf))) | |
1019 | return NULL; | |
1020 | id = os_malloc(sizeof(buf) * 2 + 2); | |
1021 | if (id == NULL) | |
1022 | return NULL; | |
1023 | ||
1024 | pos = id; | |
1025 | end = id + sizeof(buf) * 2 + 2; | |
1026 | *pos++ = prefix; | |
1027 | wpa_snprintf_hex(pos, end - pos, buf, sizeof(buf)); | |
1028 | ||
1029 | return id; | |
1030 | } | |
1031 | ||
1032 | ||
1033 | /** | |
1034 | * eap_sim_db_get_next_pseudonym - EAP-SIM DB: Get next pseudonym | |
1035 | * @data: Private data pointer from eap_sim_db_init() | |
1036 | * @method: EAP method (SIM/AKA/AKA') | |
1037 | * Returns: Next pseudonym (allocated string) or %NULL on failure | |
1038 | * | |
1039 | * This function is used to generate a pseudonym for EAP-SIM. The returned | |
1040 | * pseudonym is not added to database at this point; it will need to be added | |
1041 | * with eap_sim_db_add_pseudonym() once the authentication has been completed | |
1042 | * successfully. Caller is responsible for freeing the returned buffer. | |
1043 | */ | |
1044 | char * eap_sim_db_get_next_pseudonym(struct eap_sim_db_data *data, | |
1045 | enum eap_sim_db_method method) | |
1046 | { | |
1047 | char prefix = EAP_SIM_REAUTH_ID_PREFIX; | |
1048 | ||
1049 | switch (method) { | |
1050 | case EAP_SIM_DB_SIM: | |
1051 | prefix = EAP_SIM_PSEUDONYM_PREFIX; | |
1052 | break; | |
1053 | case EAP_SIM_DB_AKA: | |
1054 | prefix = EAP_AKA_PSEUDONYM_PREFIX; | |
1055 | break; | |
1056 | case EAP_SIM_DB_AKA_PRIME: | |
1057 | prefix = EAP_AKA_PRIME_PSEUDONYM_PREFIX; | |
1058 | break; | |
1059 | } | |
1060 | ||
1061 | return eap_sim_db_get_next(data, prefix); | |
1062 | } | |
1063 | ||
1064 | ||
1065 | /** | |
1066 | * eap_sim_db_get_next_reauth_id - EAP-SIM DB: Get next reauth_id | |
1067 | * @data: Private data pointer from eap_sim_db_init() | |
1068 | * @method: EAP method (SIM/AKA/AKA') | |
1069 | * Returns: Next reauth_id (allocated string) or %NULL on failure | |
1070 | * | |
1071 | * This function is used to generate a fast re-authentication identity for | |
1072 | * EAP-SIM. The returned reauth_id is not added to database at this point; it | |
1073 | * will need to be added with eap_sim_db_add_reauth() once the authentication | |
1074 | * has been completed successfully. Caller is responsible for freeing the | |
1075 | * returned buffer. | |
1076 | */ | |
1077 | char * eap_sim_db_get_next_reauth_id(struct eap_sim_db_data *data, | |
1078 | enum eap_sim_db_method method) | |
1079 | { | |
1080 | char prefix = EAP_SIM_REAUTH_ID_PREFIX; | |
1081 | ||
1082 | switch (method) { | |
1083 | case EAP_SIM_DB_SIM: | |
1084 | prefix = EAP_SIM_REAUTH_ID_PREFIX; | |
1085 | break; | |
1086 | case EAP_SIM_DB_AKA: | |
1087 | prefix = EAP_AKA_REAUTH_ID_PREFIX; | |
1088 | break; | |
1089 | case EAP_SIM_DB_AKA_PRIME: | |
1090 | prefix = EAP_AKA_PRIME_REAUTH_ID_PREFIX; | |
1091 | break; | |
1092 | } | |
1093 | ||
1094 | return eap_sim_db_get_next(data, prefix); | |
1095 | } | |
1096 | ||
1097 | ||
1098 | /** | |
1099 | * eap_sim_db_add_pseudonym - EAP-SIM DB: Add new pseudonym | |
1100 | * @data: Private data pointer from eap_sim_db_init() | |
1101 | * @permanent: Permanent username | |
1102 | * @pseudonym: Pseudonym for this user. This needs to be an allocated buffer, | |
1103 | * e.g., return value from eap_sim_db_get_next_pseudonym(). Caller must not | |
1104 | * free it. | |
1105 | * Returns: 0 on success, -1 on failure | |
1106 | * | |
1107 | * This function adds a new pseudonym for EAP-SIM user. EAP-SIM DB is | |
1108 | * responsible of freeing pseudonym buffer once it is not needed anymore. | |
1109 | */ | |
1110 | int eap_sim_db_add_pseudonym(struct eap_sim_db_data *data, | |
1111 | const char *permanent, char *pseudonym) | |
1112 | { | |
1113 | struct eap_sim_pseudonym *p; | |
1114 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Add pseudonym '%s' for permanent " | |
1115 | "username '%s'", pseudonym, permanent); | |
1116 | ||
1117 | /* TODO: could store last two pseudonyms */ | |
1118 | #ifdef CONFIG_SQLITE | |
1119 | if (data->sqlite_db) | |
1120 | return db_add_pseudonym(data, permanent, pseudonym); | |
1121 | #endif /* CONFIG_SQLITE */ | |
1122 | for (p = data->pseudonyms; p; p = p->next) { | |
1123 | if (os_strcmp(permanent, p->permanent) == 0) | |
1124 | break; | |
1125 | } | |
1126 | if (p) { | |
1127 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Replacing previous " | |
1128 | "pseudonym: %s", p->pseudonym); | |
1129 | os_free(p->pseudonym); | |
1130 | p->pseudonym = pseudonym; | |
1131 | return 0; | |
1132 | } | |
1133 | ||
1134 | p = os_zalloc(sizeof(*p)); | |
1135 | if (p == NULL) { | |
1136 | os_free(pseudonym); | |
1137 | return -1; | |
1138 | } | |
1139 | ||
1140 | p->next = data->pseudonyms; | |
1141 | p->permanent = os_strdup(permanent); | |
1142 | if (p->permanent == NULL) { | |
1143 | os_free(p); | |
1144 | os_free(pseudonym); | |
1145 | return -1; | |
1146 | } | |
1147 | p->pseudonym = pseudonym; | |
1148 | data->pseudonyms = p; | |
1149 | ||
1150 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Added new pseudonym entry"); | |
1151 | return 0; | |
1152 | } | |
1153 | ||
1154 | ||
1155 | static struct eap_sim_reauth * | |
1156 | eap_sim_db_add_reauth_data(struct eap_sim_db_data *data, | |
1157 | const char *permanent, | |
1158 | char *reauth_id, u16 counter) | |
1159 | { | |
1160 | struct eap_sim_reauth *r; | |
1161 | ||
1162 | for (r = data->reauths; r; r = r->next) { | |
1163 | if (os_strcmp(r->permanent, permanent) == 0) | |
1164 | break; | |
1165 | } | |
1166 | ||
1167 | if (r) { | |
1168 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Replacing previous " | |
1169 | "reauth_id: %s", r->reauth_id); | |
1170 | os_free(r->reauth_id); | |
1171 | r->reauth_id = reauth_id; | |
1172 | } else { | |
1173 | r = os_zalloc(sizeof(*r)); | |
1174 | if (r == NULL) { | |
1175 | os_free(reauth_id); | |
1176 | return NULL; | |
1177 | } | |
1178 | ||
1179 | r->next = data->reauths; | |
1180 | r->permanent = os_strdup(permanent); | |
1181 | if (r->permanent == NULL) { | |
1182 | os_free(r); | |
1183 | os_free(reauth_id); | |
1184 | return NULL; | |
1185 | } | |
1186 | r->reauth_id = reauth_id; | |
1187 | data->reauths = r; | |
1188 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Added new reauth entry"); | |
1189 | } | |
1190 | ||
1191 | r->counter = counter; | |
1192 | ||
1193 | return r; | |
1194 | } | |
1195 | ||
1196 | ||
1197 | /** | |
1198 | * eap_sim_db_add_reauth - EAP-SIM DB: Add new re-authentication entry | |
1199 | * @priv: Private data pointer from eap_sim_db_init() | |
1200 | * @permanent: Permanent username | |
1201 | * @identity_len: Length of identity | |
1202 | * @reauth_id: reauth_id for this user. This needs to be an allocated buffer, | |
1203 | * e.g., return value from eap_sim_db_get_next_reauth_id(). Caller must not | |
1204 | * free it. | |
1205 | * @counter: AT_COUNTER value for fast re-authentication | |
1206 | * @mk: 16-byte MK from the previous full authentication or %NULL | |
1207 | * Returns: 0 on success, -1 on failure | |
1208 | * | |
1209 | * This function adds a new re-authentication entry for an EAP-SIM user. | |
1210 | * EAP-SIM DB is responsible of freeing reauth_id buffer once it is not needed | |
1211 | * anymore. | |
1212 | */ | |
1213 | int eap_sim_db_add_reauth(struct eap_sim_db_data *data, const char *permanent, | |
1214 | char *reauth_id, u16 counter, const u8 *mk) | |
1215 | { | |
1216 | struct eap_sim_reauth *r; | |
1217 | ||
1218 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Add reauth_id '%s' for permanent " | |
1219 | "identity '%s'", reauth_id, permanent); | |
1220 | ||
1221 | #ifdef CONFIG_SQLITE | |
1222 | if (data->sqlite_db) | |
1223 | return db_add_reauth(data, permanent, reauth_id, counter, mk, | |
1224 | NULL, NULL, NULL); | |
1225 | #endif /* CONFIG_SQLITE */ | |
1226 | r = eap_sim_db_add_reauth_data(data, permanent, reauth_id, counter); | |
1227 | if (r == NULL) | |
1228 | return -1; | |
1229 | ||
1230 | os_memcpy(r->mk, mk, EAP_SIM_MK_LEN); | |
1231 | ||
1232 | return 0; | |
1233 | } | |
1234 | ||
1235 | ||
1236 | #ifdef EAP_SERVER_AKA_PRIME | |
1237 | /** | |
1238 | * eap_sim_db_add_reauth_prime - EAP-AKA' DB: Add new re-authentication entry | |
1239 | * @data: Private data pointer from eap_sim_db_init() | |
1240 | * @permanent: Permanent username | |
1241 | * @reauth_id: reauth_id for this user. This needs to be an allocated buffer, | |
1242 | * e.g., return value from eap_sim_db_get_next_reauth_id(). Caller must not | |
1243 | * free it. | |
1244 | * @counter: AT_COUNTER value for fast re-authentication | |
1245 | * @k_encr: K_encr from the previous full authentication | |
1246 | * @k_aut: K_aut from the previous full authentication | |
1247 | * @k_re: 32-byte K_re from the previous full authentication | |
1248 | * Returns: 0 on success, -1 on failure | |
1249 | * | |
1250 | * This function adds a new re-authentication entry for an EAP-AKA' user. | |
1251 | * EAP-SIM DB is responsible of freeing reauth_id buffer once it is not needed | |
1252 | * anymore. | |
1253 | */ | |
1254 | int eap_sim_db_add_reauth_prime(struct eap_sim_db_data *data, | |
1255 | const char *permanent, char *reauth_id, | |
1256 | u16 counter, const u8 *k_encr, | |
1257 | const u8 *k_aut, const u8 *k_re) | |
1258 | { | |
1259 | struct eap_sim_reauth *r; | |
1260 | ||
1261 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Add reauth_id '%s' for permanent " | |
1262 | "identity '%s'", reauth_id, permanent); | |
1263 | ||
1264 | #ifdef CONFIG_SQLITE | |
1265 | if (data->sqlite_db) | |
1266 | return db_add_reauth(data, permanent, reauth_id, counter, NULL, | |
1267 | k_encr, k_aut, k_re); | |
1268 | #endif /* CONFIG_SQLITE */ | |
1269 | r = eap_sim_db_add_reauth_data(data, permanent, reauth_id, counter); | |
1270 | if (r == NULL) | |
1271 | return -1; | |
1272 | ||
1273 | os_memcpy(r->k_encr, k_encr, EAP_SIM_K_ENCR_LEN); | |
1274 | os_memcpy(r->k_aut, k_aut, EAP_AKA_PRIME_K_AUT_LEN); | |
1275 | os_memcpy(r->k_re, k_re, EAP_AKA_PRIME_K_RE_LEN); | |
1276 | ||
1277 | return 0; | |
1278 | } | |
1279 | #endif /* EAP_SERVER_AKA_PRIME */ | |
1280 | ||
1281 | ||
1282 | /** | |
1283 | * eap_sim_db_get_permanent - EAP-SIM DB: Get permanent identity | |
1284 | * @data: Private data pointer from eap_sim_db_init() | |
1285 | * @pseudonym: Pseudonym username | |
1286 | * Returns: Pointer to permanent username or %NULL if not found | |
1287 | */ | |
1288 | const char * | |
1289 | eap_sim_db_get_permanent(struct eap_sim_db_data *data, const char *pseudonym) | |
1290 | { | |
1291 | struct eap_sim_pseudonym *p; | |
1292 | ||
1293 | #ifdef CONFIG_SQLITE | |
1294 | if (data->sqlite_db) | |
1295 | return db_get_pseudonym(data, pseudonym); | |
1296 | #endif /* CONFIG_SQLITE */ | |
1297 | ||
1298 | p = data->pseudonyms; | |
1299 | while (p) { | |
1300 | if (os_strcmp(p->pseudonym, pseudonym) == 0) | |
1301 | return p->permanent; | |
1302 | p = p->next; | |
1303 | } | |
1304 | ||
1305 | return NULL; | |
1306 | } | |
1307 | ||
1308 | ||
1309 | /** | |
1310 | * eap_sim_db_get_reauth_entry - EAP-SIM DB: Get re-authentication entry | |
1311 | * @data: Private data pointer from eap_sim_db_init() | |
1312 | * @reauth_id: Fast re-authentication username | |
1313 | * Returns: Pointer to the re-auth entry, or %NULL if not found | |
1314 | */ | |
1315 | struct eap_sim_reauth * | |
1316 | eap_sim_db_get_reauth_entry(struct eap_sim_db_data *data, | |
1317 | const char *reauth_id) | |
1318 | { | |
1319 | struct eap_sim_reauth *r; | |
1320 | ||
1321 | #ifdef CONFIG_SQLITE | |
1322 | if (data->sqlite_db) | |
1323 | return db_get_reauth(data, reauth_id); | |
1324 | #endif /* CONFIG_SQLITE */ | |
1325 | ||
1326 | r = data->reauths; | |
1327 | while (r) { | |
1328 | if (os_strcmp(r->reauth_id, reauth_id) == 0) | |
1329 | break; | |
1330 | r = r->next; | |
1331 | } | |
1332 | ||
1333 | return r; | |
1334 | } | |
1335 | ||
1336 | ||
1337 | /** | |
1338 | * eap_sim_db_remove_reauth - EAP-SIM DB: Remove re-authentication entry | |
1339 | * @data: Private data pointer from eap_sim_db_init() | |
1340 | * @reauth: Pointer to re-authentication entry from | |
1341 | * eap_sim_db_get_reauth_entry() | |
1342 | */ | |
1343 | void eap_sim_db_remove_reauth(struct eap_sim_db_data *data, | |
1344 | struct eap_sim_reauth *reauth) | |
1345 | { | |
1346 | struct eap_sim_reauth *r, *prev = NULL; | |
1347 | #ifdef CONFIG_SQLITE | |
1348 | if (data->sqlite_db) { | |
1349 | db_remove_reauth(data, reauth); | |
1350 | return; | |
1351 | } | |
1352 | #endif /* CONFIG_SQLITE */ | |
1353 | r = data->reauths; | |
1354 | while (r) { | |
1355 | if (r == reauth) { | |
1356 | if (prev) | |
1357 | prev->next = r->next; | |
1358 | else | |
1359 | data->reauths = r->next; | |
1360 | eap_sim_db_free_reauth(r); | |
1361 | return; | |
1362 | } | |
1363 | prev = r; | |
1364 | r = r->next; | |
1365 | } | |
1366 | } | |
1367 | ||
1368 | ||
1369 | /** | |
1370 | * eap_sim_db_get_aka_auth - Get AKA authentication values | |
1371 | * @data: Private data pointer from eap_sim_db_init() | |
1372 | * @username: Permanent username (prefix | IMSI) | |
1373 | * @_rand: Buffer for RAND value | |
1374 | * @autn: Buffer for AUTN value | |
1375 | * @ik: Buffer for IK value | |
1376 | * @ck: Buffer for CK value | |
1377 | * @res: Buffer for RES value | |
1378 | * @res_len: Buffer for RES length | |
1379 | * @cb_session_ctx: Session callback context for get_complete_cb() | |
1380 | * Returns: 0 on success, -1 (EAP_SIM_DB_FAILURE) on error (e.g., user not | |
1381 | * found), or -2 (EAP_SIM_DB_PENDING) if results are not yet available. In this | |
1382 | * case, the callback function registered with eap_sim_db_init() will be | |
1383 | * called once the results become available. | |
1384 | * | |
1385 | * When using an external server for AKA authentication, this function can | |
1386 | * always start a request and return EAP_SIM_DB_PENDING immediately if | |
1387 | * authentication triplets are not available. Once the authentication data are | |
1388 | * received, callback function registered with eap_sim_db_init() is called to | |
1389 | * notify EAP state machine to reprocess the message. This | |
1390 | * eap_sim_db_get_aka_auth() function will then be called again and the newly | |
1391 | * received triplets will then be given to the caller. | |
1392 | */ | |
1393 | int eap_sim_db_get_aka_auth(struct eap_sim_db_data *data, const char *username, | |
1394 | u8 *_rand, u8 *autn, u8 *ik, u8 *ck, | |
1395 | u8 *res, size_t *res_len, void *cb_session_ctx) | |
1396 | { | |
1397 | struct eap_sim_db_pending *entry; | |
1398 | int len; | |
1399 | char msg[40]; | |
1400 | const char *imsi; | |
1401 | size_t imsi_len; | |
1402 | ||
1403 | if (username == NULL || | |
1404 | (username[0] != EAP_AKA_PERMANENT_PREFIX && | |
1405 | username[0] != EAP_AKA_PRIME_PERMANENT_PREFIX) || | |
1406 | username[1] == '\0' || os_strlen(username) > sizeof(entry->imsi)) { | |
1407 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: unexpected username '%s'", | |
1408 | username); | |
1409 | return EAP_SIM_DB_FAILURE; | |
1410 | } | |
1411 | imsi = username + 1; | |
1412 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Get AKA auth for IMSI '%s'", | |
1413 | imsi); | |
1414 | ||
1415 | entry = eap_sim_db_get_pending(data, imsi, 1); | |
1416 | if (entry) { | |
1417 | if (entry->state == FAILURE) { | |
1418 | eap_sim_db_free_pending(data, entry); | |
1419 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Failure"); | |
1420 | return EAP_SIM_DB_FAILURE; | |
1421 | } | |
1422 | ||
1423 | if (entry->state == PENDING) { | |
1424 | eap_sim_db_add_pending(data, entry); | |
1425 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Pending"); | |
1426 | return EAP_SIM_DB_PENDING; | |
1427 | } | |
1428 | ||
1429 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Returning successfully " | |
1430 | "received authentication data"); | |
1431 | os_memcpy(_rand, entry->u.aka.rand, EAP_AKA_RAND_LEN); | |
1432 | os_memcpy(autn, entry->u.aka.autn, EAP_AKA_AUTN_LEN); | |
1433 | os_memcpy(ik, entry->u.aka.ik, EAP_AKA_IK_LEN); | |
1434 | os_memcpy(ck, entry->u.aka.ck, EAP_AKA_CK_LEN); | |
1435 | os_memcpy(res, entry->u.aka.res, EAP_AKA_RES_MAX_LEN); | |
1436 | *res_len = entry->u.aka.res_len; | |
1437 | eap_sim_db_free_pending(data, entry); | |
1438 | return 0; | |
1439 | } | |
1440 | ||
1441 | if (data->sock < 0) { | |
1442 | if (eap_sim_db_open_socket(data) < 0) | |
1443 | return EAP_SIM_DB_FAILURE; | |
1444 | } | |
1445 | ||
1446 | imsi_len = os_strlen(imsi); | |
1447 | len = os_snprintf(msg, sizeof(msg), "AKA-REQ-AUTH "); | |
1448 | if (os_snprintf_error(sizeof(msg), len) || | |
1449 | len + imsi_len >= sizeof(msg)) | |
1450 | return EAP_SIM_DB_FAILURE; | |
1451 | os_memcpy(msg + len, imsi, imsi_len); | |
1452 | len += imsi_len; | |
1453 | ||
1454 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: requesting AKA authentication " | |
1455 | "data for IMSI '%s'", imsi); | |
1456 | if (eap_sim_db_send(data, msg, len) < 0) | |
1457 | return EAP_SIM_DB_FAILURE; | |
1458 | ||
1459 | entry = os_zalloc(sizeof(*entry)); | |
1460 | if (entry == NULL) | |
1461 | return EAP_SIM_DB_FAILURE; | |
1462 | ||
1463 | entry->aka = 1; | |
1464 | os_strlcpy(entry->imsi, imsi, sizeof(entry->imsi)); | |
1465 | entry->cb_session_ctx = cb_session_ctx; | |
1466 | entry->state = PENDING; | |
1467 | eap_sim_db_add_pending(data, entry); | |
1468 | eap_sim_db_expire_pending(data, entry); | |
1469 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Added query %p", entry); | |
1470 | ||
1471 | return EAP_SIM_DB_PENDING; | |
1472 | } | |
1473 | ||
1474 | ||
1475 | /** | |
1476 | * eap_sim_db_resynchronize - Resynchronize AKA AUTN | |
1477 | * @data: Private data pointer from eap_sim_db_init() | |
1478 | * @username: Permanent username | |
1479 | * @auts: AUTS value from the peer | |
1480 | * @_rand: RAND value used in the rejected message | |
1481 | * Returns: 0 on success, -1 on failure | |
1482 | * | |
1483 | * This function is called when the peer reports synchronization failure in the | |
1484 | * AUTN value by sending AUTS. The AUTS and RAND values should be sent to | |
1485 | * HLR/AuC to allow it to resynchronize with the peer. After this, | |
1486 | * eap_sim_db_get_aka_auth() will be called again to to fetch updated | |
1487 | * RAND/AUTN values for the next challenge. | |
1488 | */ | |
1489 | int eap_sim_db_resynchronize(struct eap_sim_db_data *data, | |
1490 | const char *username, | |
1491 | const u8 *auts, const u8 *_rand) | |
1492 | { | |
1493 | const char *imsi; | |
1494 | size_t imsi_len; | |
1495 | ||
1496 | if (username == NULL || | |
1497 | (username[0] != EAP_AKA_PERMANENT_PREFIX && | |
1498 | username[0] != EAP_AKA_PRIME_PERMANENT_PREFIX) || | |
1499 | username[1] == '\0' || os_strlen(username) > 20) { | |
1500 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: unexpected username '%s'", | |
1501 | username); | |
1502 | return -1; | |
1503 | } | |
1504 | imsi = username + 1; | |
1505 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: Get AKA auth for IMSI '%s'", | |
1506 | imsi); | |
1507 | ||
1508 | if (data->sock >= 0) { | |
1509 | char msg[100]; | |
1510 | int len, ret; | |
1511 | ||
1512 | imsi_len = os_strlen(imsi); | |
1513 | len = os_snprintf(msg, sizeof(msg), "AKA-AUTS "); | |
1514 | if (os_snprintf_error(sizeof(msg), len) || | |
1515 | len + imsi_len >= sizeof(msg)) | |
1516 | return -1; | |
1517 | os_memcpy(msg + len, imsi, imsi_len); | |
1518 | len += imsi_len; | |
1519 | ||
1520 | ret = os_snprintf(msg + len, sizeof(msg) - len, " "); | |
1521 | if (os_snprintf_error(sizeof(msg) - len, ret)) | |
1522 | return -1; | |
1523 | len += ret; | |
1524 | len += wpa_snprintf_hex(msg + len, sizeof(msg) - len, | |
1525 | auts, EAP_AKA_AUTS_LEN); | |
1526 | ret = os_snprintf(msg + len, sizeof(msg) - len, " "); | |
1527 | if (os_snprintf_error(sizeof(msg) - len, ret)) | |
1528 | return -1; | |
1529 | len += ret; | |
1530 | len += wpa_snprintf_hex(msg + len, sizeof(msg) - len, | |
1531 | _rand, EAP_AKA_RAND_LEN); | |
1532 | wpa_printf(MSG_DEBUG, "EAP-SIM DB: reporting AKA AUTS for " | |
1533 | "IMSI '%s'", imsi); | |
1534 | if (eap_sim_db_send(data, msg, len) < 0) | |
1535 | return -1; | |
1536 | } | |
1537 | ||
1538 | return 0; | |
1539 | } | |
1540 | ||
1541 | ||
1542 | /** | |
1543 | * sim_get_username - Extract username from SIM identity | |
1544 | * @identity: Identity | |
1545 | * @identity_len: Identity length | |
1546 | * Returns: Allocated buffer with the username part of the identity | |
1547 | * | |
1548 | * Caller is responsible for freeing the returned buffer with os_free(). | |
1549 | */ | |
1550 | char * sim_get_username(const u8 *identity, size_t identity_len) | |
1551 | { | |
1552 | size_t pos; | |
1553 | ||
1554 | if (identity == NULL) | |
1555 | return NULL; | |
1556 | ||
1557 | for (pos = 0; pos < identity_len; pos++) { | |
1558 | if (identity[pos] == '@' || identity[pos] == '\0') | |
1559 | break; | |
1560 | } | |
1561 | ||
1562 | return dup_binstr(identity, pos); | |
1563 | } |