1 /*
2 * hostapd / EAP Full Authenticator state machine (RFC 4137)
3 * Copyright (c) 2004-2007, 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 state machine is based on the full authenticator state machine defined
9 * in RFC 4137. However, to support backend authentication in RADIUS
10 * authentication server functionality, parts of backend authenticator (also
11 * from RFC 4137) are mixed in. This functionality is enabled by setting
12 * backend_auth configuration variable to TRUE.
13 */
14
15 #include "includes.h"
16
17 #include "common.h"
18 #include "eap_i.h"
19 #include "state_machine.h"
20 #include "common/wpa_ctrl.h"
21
22 #define STATE_MACHINE_DATA struct eap_sm
23 #define STATE_MACHINE_DEBUG_PREFIX "EAP"
24
25 #define EAP_MAX_AUTH_ROUNDS 50
26
27 static void eap_user_free(struct eap_user *user);
28
29
30 /* EAP state machines are described in RFC 4137 */
31
32 static int eap_sm_calculateTimeout(struct eap_sm *sm, int retransCount,
33 int eapSRTT, int eapRTTVAR,
34 int methodTimeout);
35 static void eap_sm_parseEapResp(struct eap_sm *sm, const struct wpabuf *resp);
36 static int eap_sm_getId(const struct wpabuf *data);
37 static struct wpabuf * eap_sm_buildSuccess(struct eap_sm *sm, u8 id);
38 static struct wpabuf * eap_sm_buildFailure(struct eap_sm *sm, u8 id);
39 static int eap_sm_nextId(struct eap_sm *sm, int id);
40 static void eap_sm_Policy_update(struct eap_sm *sm, const u8 *nak_list,
41 size_t len);
42 static EapType eap_sm_Policy_getNextMethod(struct eap_sm *sm, int *vendor);
43 static int eap_sm_Policy_getDecision(struct eap_sm *sm);
44 static Boolean eap_sm_Policy_doPickUp(struct eap_sm *sm, EapType method);
45
46
eap_copy_buf(struct wpabuf ** dst,const struct wpabuf * src)47 static int eap_copy_buf(struct wpabuf **dst, const struct wpabuf *src)
48 {
49 if (src == NULL)
50 return -1;
51
52 wpabuf_free(*dst);
53 *dst = wpabuf_dup(src);
54 return *dst ? 0 : -1;
55 }
56
57
eap_copy_data(u8 ** dst,size_t * dst_len,const u8 * src,size_t src_len)58 static int eap_copy_data(u8 **dst, size_t *dst_len,
59 const u8 *src, size_t src_len)
60 {
61 if (src == NULL)
62 return -1;
63
64 os_free(*dst);
65 *dst = os_malloc(src_len);
66 if (*dst) {
67 os_memcpy(*dst, src, src_len);
68 *dst_len = src_len;
69 return 0;
70 } else {
71 *dst_len = 0;
72 return -1;
73 }
74 }
75
76 #define EAP_COPY(dst, src) \
77 eap_copy_data((dst), (dst ## Len), (src), (src ## Len))
78
79
80 /**
81 * eap_user_get - Fetch user information from the database
82 * @sm: Pointer to EAP state machine allocated with eap_server_sm_init()
83 * @identity: Identity (User-Name) of the user
84 * @identity_len: Length of identity in bytes
85 * @phase2: 0 = EAP phase1 user, 1 = EAP phase2 (tunneled) user
86 * Returns: 0 on success, or -1 on failure
87 *
88 * This function is used to fetch user information for EAP. The user will be
89 * selected based on the specified identity. sm->user and
90 * sm->user_eap_method_index are updated for the new user when a matching user
91 * is found. sm->user can be used to get user information (e.g., password).
92 */
eap_user_get(struct eap_sm * sm,const u8 * identity,size_t identity_len,int phase2)93 int eap_user_get(struct eap_sm *sm, const u8 *identity, size_t identity_len,
94 int phase2)
95 {
96 struct eap_user *user;
97
98 if (sm == NULL || sm->eapol_cb == NULL ||
99 sm->eapol_cb->get_eap_user == NULL)
100 return -1;
101
102 eap_user_free(sm->user);
103 sm->user = NULL;
104
105 user = os_zalloc(sizeof(*user));
106 if (user == NULL)
107 return -1;
108
109 if (sm->eapol_cb->get_eap_user(sm->eapol_ctx, identity,
110 identity_len, phase2, user) != 0) {
111 eap_user_free(user);
112 return -1;
113 }
114
115 sm->user = user;
116 sm->user_eap_method_index = 0;
117
118 return 0;
119 }
120
121
eap_log_msg(struct eap_sm * sm,const char * fmt,...)122 void eap_log_msg(struct eap_sm *sm, const char *fmt, ...)
123 {
124 va_list ap;
125 char *buf;
126 int buflen;
127
128 if (sm == NULL || sm->eapol_cb == NULL || sm->eapol_cb->log_msg == NULL)
129 return;
130
131 va_start(ap, fmt);
132 buflen = vsnprintf(NULL, 0, fmt, ap) + 1;
133 va_end(ap);
134
135 buf = os_malloc(buflen);
136 if (buf == NULL)
137 return;
138 va_start(ap, fmt);
139 vsnprintf(buf, buflen, fmt, ap);
140 va_end(ap);
141
142 sm->eapol_cb->log_msg(sm->eapol_ctx, buf);
143
144 os_free(buf);
145 }
146
147
SM_STATE(EAP,DISABLED)148 SM_STATE(EAP, DISABLED)
149 {
150 SM_ENTRY(EAP, DISABLED);
151 sm->num_rounds = 0;
152 }
153
154
SM_STATE(EAP,INITIALIZE)155 SM_STATE(EAP, INITIALIZE)
156 {
157 SM_ENTRY(EAP, INITIALIZE);
158
159 if (sm->eap_if.eapRestart && !sm->eap_server && sm->identity) {
160 /*
161 * Need to allow internal Identity method to be used instead
162 * of passthrough at the beginning of reauthentication.
163 */
164 eap_server_clear_identity(sm);
165 }
166
167 sm->currentId = -1;
168 sm->eap_if.eapSuccess = FALSE;
169 sm->eap_if.eapFail = FALSE;
170 sm->eap_if.eapTimeout = FALSE;
171 bin_clear_free(sm->eap_if.eapKeyData, sm->eap_if.eapKeyDataLen);
172 sm->eap_if.eapKeyData = NULL;
173 sm->eap_if.eapKeyDataLen = 0;
174 sm->eap_if.eapKeyAvailable = FALSE;
175 sm->eap_if.eapRestart = FALSE;
176
177 /*
178 * This is not defined in RFC 4137, but method state needs to be
179 * reseted here so that it does not remain in success state when
180 * re-authentication starts.
181 */
182 if (sm->m && sm->eap_method_priv) {
183 sm->m->reset(sm, sm->eap_method_priv);
184 sm->eap_method_priv = NULL;
185 }
186 sm->m = NULL;
187 sm->user_eap_method_index = 0;
188
189 if (sm->backend_auth) {
190 sm->currentMethod = EAP_TYPE_NONE;
191 /* parse rxResp, respId, respMethod */
192 eap_sm_parseEapResp(sm, sm->eap_if.eapRespData);
193 if (sm->rxResp) {
194 sm->currentId = sm->respId;
195 }
196 }
197 sm->num_rounds = 0;
198 sm->method_pending = METHOD_PENDING_NONE;
199
200 wpa_msg(sm->msg_ctx, MSG_INFO, WPA_EVENT_EAP_STARTED
201 MACSTR, MAC2STR(sm->peer_addr));
202 }
203
204
SM_STATE(EAP,PICK_UP_METHOD)205 SM_STATE(EAP, PICK_UP_METHOD)
206 {
207 SM_ENTRY(EAP, PICK_UP_METHOD);
208
209 if (eap_sm_Policy_doPickUp(sm, sm->respMethod)) {
210 sm->currentMethod = sm->respMethod;
211 if (sm->m && sm->eap_method_priv) {
212 sm->m->reset(sm, sm->eap_method_priv);
213 sm->eap_method_priv = NULL;
214 }
215 sm->m = eap_server_get_eap_method(EAP_VENDOR_IETF,
216 sm->currentMethod);
217 if (sm->m && sm->m->initPickUp) {
218 sm->eap_method_priv = sm->m->initPickUp(sm);
219 if (sm->eap_method_priv == NULL) {
220 wpa_printf(MSG_DEBUG, "EAP: Failed to "
221 "initialize EAP method %d",
222 sm->currentMethod);
223 sm->m = NULL;
224 sm->currentMethod = EAP_TYPE_NONE;
225 }
226 } else {
227 sm->m = NULL;
228 sm->currentMethod = EAP_TYPE_NONE;
229 }
230 }
231
232 wpa_msg(sm->msg_ctx, MSG_INFO, WPA_EVENT_EAP_PROPOSED_METHOD
233 "method=%u", sm->currentMethod);
234 }
235
236
SM_STATE(EAP,IDLE)237 SM_STATE(EAP, IDLE)
238 {
239 SM_ENTRY(EAP, IDLE);
240
241 sm->eap_if.retransWhile = eap_sm_calculateTimeout(
242 sm, sm->retransCount, sm->eap_if.eapSRTT, sm->eap_if.eapRTTVAR,
243 sm->methodTimeout);
244 }
245
246
SM_STATE(EAP,RETRANSMIT)247 SM_STATE(EAP, RETRANSMIT)
248 {
249 SM_ENTRY(EAP, RETRANSMIT);
250
251 sm->retransCount++;
252 if (sm->retransCount <= sm->MaxRetrans && sm->lastReqData) {
253 if (eap_copy_buf(&sm->eap_if.eapReqData, sm->lastReqData) == 0)
254 sm->eap_if.eapReq = TRUE;
255 }
256 }
257
258
SM_STATE(EAP,RECEIVED)259 SM_STATE(EAP, RECEIVED)
260 {
261 SM_ENTRY(EAP, RECEIVED);
262
263 /* parse rxResp, respId, respMethod */
264 eap_sm_parseEapResp(sm, sm->eap_if.eapRespData);
265 sm->num_rounds++;
266 }
267
268
SM_STATE(EAP,DISCARD)269 SM_STATE(EAP, DISCARD)
270 {
271 SM_ENTRY(EAP, DISCARD);
272 sm->eap_if.eapResp = FALSE;
273 sm->eap_if.eapNoReq = TRUE;
274 }
275
276
SM_STATE(EAP,SEND_REQUEST)277 SM_STATE(EAP, SEND_REQUEST)
278 {
279 SM_ENTRY(EAP, SEND_REQUEST);
280
281 sm->retransCount = 0;
282 if (sm->eap_if.eapReqData) {
283 if (eap_copy_buf(&sm->lastReqData, sm->eap_if.eapReqData) == 0)
284 {
285 sm->eap_if.eapResp = FALSE;
286 sm->eap_if.eapReq = TRUE;
287 } else {
288 sm->eap_if.eapResp = FALSE;
289 sm->eap_if.eapReq = FALSE;
290 }
291 } else {
292 wpa_printf(MSG_INFO, "EAP: SEND_REQUEST - no eapReqData");
293 sm->eap_if.eapResp = FALSE;
294 sm->eap_if.eapReq = FALSE;
295 sm->eap_if.eapNoReq = TRUE;
296 }
297 }
298
299
SM_STATE(EAP,INTEGRITY_CHECK)300 SM_STATE(EAP, INTEGRITY_CHECK)
301 {
302 SM_ENTRY(EAP, INTEGRITY_CHECK);
303
304 if (!eap_hdr_len_valid(sm->eap_if.eapRespData, 1)) {
305 sm->ignore = TRUE;
306 return;
307 }
308
309 if (sm->m->check) {
310 sm->ignore = sm->m->check(sm, sm->eap_method_priv,
311 sm->eap_if.eapRespData);
312 }
313 }
314
315
SM_STATE(EAP,METHOD_REQUEST)316 SM_STATE(EAP, METHOD_REQUEST)
317 {
318 SM_ENTRY(EAP, METHOD_REQUEST);
319
320 if (sm->m == NULL) {
321 wpa_printf(MSG_DEBUG, "EAP: method not initialized");
322 return;
323 }
324
325 sm->currentId = eap_sm_nextId(sm, sm->currentId);
326 wpa_printf(MSG_DEBUG, "EAP: building EAP-Request: Identifier %d",
327 sm->currentId);
328 sm->lastId = sm->currentId;
329 wpabuf_free(sm->eap_if.eapReqData);
330 sm->eap_if.eapReqData = sm->m->buildReq(sm, sm->eap_method_priv,
331 sm->currentId);
332 if (sm->m->getTimeout)
333 sm->methodTimeout = sm->m->getTimeout(sm, sm->eap_method_priv);
334 else
335 sm->methodTimeout = 0;
336 }
337
338
SM_STATE(EAP,METHOD_RESPONSE)339 SM_STATE(EAP, METHOD_RESPONSE)
340 {
341 SM_ENTRY(EAP, METHOD_RESPONSE);
342
343 if (!eap_hdr_len_valid(sm->eap_if.eapRespData, 1))
344 return;
345
346 sm->m->process(sm, sm->eap_method_priv, sm->eap_if.eapRespData);
347 if (sm->m->isDone(sm, sm->eap_method_priv)) {
348 eap_sm_Policy_update(sm, NULL, 0);
349 bin_clear_free(sm->eap_if.eapKeyData, sm->eap_if.eapKeyDataLen);
350 if (sm->m->getKey) {
351 sm->eap_if.eapKeyData = sm->m->getKey(
352 sm, sm->eap_method_priv,
353 &sm->eap_if.eapKeyDataLen);
354 } else {
355 sm->eap_if.eapKeyData = NULL;
356 sm->eap_if.eapKeyDataLen = 0;
357 }
358 sm->methodState = METHOD_END;
359 } else {
360 sm->methodState = METHOD_CONTINUE;
361 }
362 }
363
364
SM_STATE(EAP,PROPOSE_METHOD)365 SM_STATE(EAP, PROPOSE_METHOD)
366 {
367 int vendor;
368 EapType type;
369
370 SM_ENTRY(EAP, PROPOSE_METHOD);
371
372 try_another_method:
373 type = eap_sm_Policy_getNextMethod(sm, &vendor);
374 if (vendor == EAP_VENDOR_IETF)
375 sm->currentMethod = type;
376 else
377 sm->currentMethod = EAP_TYPE_EXPANDED;
378 if (sm->m && sm->eap_method_priv) {
379 sm->m->reset(sm, sm->eap_method_priv);
380 sm->eap_method_priv = NULL;
381 }
382 sm->m = eap_server_get_eap_method(vendor, type);
383 if (sm->m) {
384 sm->eap_method_priv = sm->m->init(sm);
385 if (sm->eap_method_priv == NULL) {
386 wpa_printf(MSG_DEBUG, "EAP: Failed to initialize EAP "
387 "method %d", sm->currentMethod);
388 sm->m = NULL;
389 sm->currentMethod = EAP_TYPE_NONE;
390 goto try_another_method;
391 }
392 }
393 if (sm->m == NULL) {
394 wpa_printf(MSG_DEBUG, "EAP: Could not find suitable EAP method");
395 eap_log_msg(sm, "Could not find suitable EAP method");
396 sm->decision = DECISION_FAILURE;
397 return;
398 }
399 if (sm->currentMethod == EAP_TYPE_IDENTITY ||
400 sm->currentMethod == EAP_TYPE_NOTIFICATION)
401 sm->methodState = METHOD_CONTINUE;
402 else
403 sm->methodState = METHOD_PROPOSED;
404
405 wpa_msg(sm->msg_ctx, MSG_INFO, WPA_EVENT_EAP_PROPOSED_METHOD
406 "vendor=%u method=%u", vendor, sm->currentMethod);
407 eap_log_msg(sm, "Propose EAP method vendor=%u method=%u",
408 vendor, sm->currentMethod);
409 }
410
411
SM_STATE(EAP,NAK)412 SM_STATE(EAP, NAK)
413 {
414 const struct eap_hdr *nak;
415 size_t len = 0;
416 const u8 *pos;
417 const u8 *nak_list = NULL;
418
419 SM_ENTRY(EAP, NAK);
420
421 if (sm->eap_method_priv) {
422 sm->m->reset(sm, sm->eap_method_priv);
423 sm->eap_method_priv = NULL;
424 }
425 sm->m = NULL;
426
427 if (!eap_hdr_len_valid(sm->eap_if.eapRespData, 1))
428 return;
429
430 nak = wpabuf_head(sm->eap_if.eapRespData);
431 if (nak && wpabuf_len(sm->eap_if.eapRespData) > sizeof(*nak)) {
432 len = be_to_host16(nak->length);
433 if (len > wpabuf_len(sm->eap_if.eapRespData))
434 len = wpabuf_len(sm->eap_if.eapRespData);
435 pos = (const u8 *) (nak + 1);
436 len -= sizeof(*nak);
437 if (*pos == EAP_TYPE_NAK) {
438 pos++;
439 len--;
440 nak_list = pos;
441 }
442 }
443 eap_sm_Policy_update(sm, nak_list, len);
444 }
445
446
SM_STATE(EAP,SELECT_ACTION)447 SM_STATE(EAP, SELECT_ACTION)
448 {
449 SM_ENTRY(EAP, SELECT_ACTION);
450
451 sm->decision = eap_sm_Policy_getDecision(sm);
452 }
453
454
SM_STATE(EAP,TIMEOUT_FAILURE)455 SM_STATE(EAP, TIMEOUT_FAILURE)
456 {
457 SM_ENTRY(EAP, TIMEOUT_FAILURE);
458
459 sm->eap_if.eapTimeout = TRUE;
460 }
461
462
SM_STATE(EAP,FAILURE)463 SM_STATE(EAP, FAILURE)
464 {
465 SM_ENTRY(EAP, FAILURE);
466
467 wpabuf_free(sm->eap_if.eapReqData);
468 sm->eap_if.eapReqData = eap_sm_buildFailure(sm, sm->currentId);
469 wpabuf_free(sm->lastReqData);
470 sm->lastReqData = NULL;
471 sm->eap_if.eapFail = TRUE;
472
473 wpa_msg(sm->msg_ctx, MSG_INFO, WPA_EVENT_EAP_FAILURE
474 MACSTR, MAC2STR(sm->peer_addr));
475 }
476
477
SM_STATE(EAP,SUCCESS)478 SM_STATE(EAP, SUCCESS)
479 {
480 SM_ENTRY(EAP, SUCCESS);
481
482 wpabuf_free(sm->eap_if.eapReqData);
483 sm->eap_if.eapReqData = eap_sm_buildSuccess(sm, sm->currentId);
484 wpabuf_free(sm->lastReqData);
485 sm->lastReqData = NULL;
486 if (sm->eap_if.eapKeyData)
487 sm->eap_if.eapKeyAvailable = TRUE;
488 sm->eap_if.eapSuccess = TRUE;
489
490 wpa_msg(sm->msg_ctx, MSG_INFO, WPA_EVENT_EAP_SUCCESS
491 MACSTR, MAC2STR(sm->peer_addr));
492 }
493
494
SM_STATE(EAP,INITIALIZE_PASSTHROUGH)495 SM_STATE(EAP, INITIALIZE_PASSTHROUGH)
496 {
497 SM_ENTRY(EAP, INITIALIZE_PASSTHROUGH);
498
499 wpabuf_free(sm->eap_if.aaaEapRespData);
500 sm->eap_if.aaaEapRespData = NULL;
501 }
502
503
SM_STATE(EAP,IDLE2)504 SM_STATE(EAP, IDLE2)
505 {
506 SM_ENTRY(EAP, IDLE2);
507
508 sm->eap_if.retransWhile = eap_sm_calculateTimeout(
509 sm, sm->retransCount, sm->eap_if.eapSRTT, sm->eap_if.eapRTTVAR,
510 sm->methodTimeout);
511 }
512
513
SM_STATE(EAP,RETRANSMIT2)514 SM_STATE(EAP, RETRANSMIT2)
515 {
516 SM_ENTRY(EAP, RETRANSMIT2);
517
518 sm->retransCount++;
519 if (sm->retransCount <= sm->MaxRetrans && sm->lastReqData) {
520 if (eap_copy_buf(&sm->eap_if.eapReqData, sm->lastReqData) == 0)
521 sm->eap_if.eapReq = TRUE;
522 }
523 }
524
525
SM_STATE(EAP,RECEIVED2)526 SM_STATE(EAP, RECEIVED2)
527 {
528 SM_ENTRY(EAP, RECEIVED2);
529
530 /* parse rxResp, respId, respMethod */
531 eap_sm_parseEapResp(sm, sm->eap_if.eapRespData);
532 }
533
534
SM_STATE(EAP,DISCARD2)535 SM_STATE(EAP, DISCARD2)
536 {
537 SM_ENTRY(EAP, DISCARD2);
538 sm->eap_if.eapResp = FALSE;
539 sm->eap_if.eapNoReq = TRUE;
540 }
541
542
SM_STATE(EAP,SEND_REQUEST2)543 SM_STATE(EAP, SEND_REQUEST2)
544 {
545 SM_ENTRY(EAP, SEND_REQUEST2);
546
547 sm->retransCount = 0;
548 if (sm->eap_if.eapReqData) {
549 if (eap_copy_buf(&sm->lastReqData, sm->eap_if.eapReqData) == 0)
550 {
551 sm->eap_if.eapResp = FALSE;
552 sm->eap_if.eapReq = TRUE;
553 } else {
554 sm->eap_if.eapResp = FALSE;
555 sm->eap_if.eapReq = FALSE;
556 }
557 } else {
558 wpa_printf(MSG_INFO, "EAP: SEND_REQUEST2 - no eapReqData");
559 sm->eap_if.eapResp = FALSE;
560 sm->eap_if.eapReq = FALSE;
561 sm->eap_if.eapNoReq = TRUE;
562 }
563 }
564
565
SM_STATE(EAP,AAA_REQUEST)566 SM_STATE(EAP, AAA_REQUEST)
567 {
568 SM_ENTRY(EAP, AAA_REQUEST);
569
570 if (sm->eap_if.eapRespData == NULL) {
571 wpa_printf(MSG_INFO, "EAP: AAA_REQUEST - no eapRespData");
572 return;
573 }
574
575 /*
576 * if (respMethod == IDENTITY)
577 * aaaIdentity = eapRespData
578 * This is already taken care of by the EAP-Identity method which
579 * stores the identity into sm->identity.
580 */
581
582 eap_copy_buf(&sm->eap_if.aaaEapRespData, sm->eap_if.eapRespData);
583 }
584
585
SM_STATE(EAP,AAA_RESPONSE)586 SM_STATE(EAP, AAA_RESPONSE)
587 {
588 SM_ENTRY(EAP, AAA_RESPONSE);
589
590 eap_copy_buf(&sm->eap_if.eapReqData, sm->eap_if.aaaEapReqData);
591 sm->currentId = eap_sm_getId(sm->eap_if.eapReqData);
592 sm->methodTimeout = sm->eap_if.aaaMethodTimeout;
593 }
594
595
SM_STATE(EAP,AAA_IDLE)596 SM_STATE(EAP, AAA_IDLE)
597 {
598 SM_ENTRY(EAP, AAA_IDLE);
599
600 sm->eap_if.aaaFail = FALSE;
601 sm->eap_if.aaaSuccess = FALSE;
602 sm->eap_if.aaaEapReq = FALSE;
603 sm->eap_if.aaaEapNoReq = FALSE;
604 sm->eap_if.aaaEapResp = TRUE;
605 }
606
607
SM_STATE(EAP,TIMEOUT_FAILURE2)608 SM_STATE(EAP, TIMEOUT_FAILURE2)
609 {
610 SM_ENTRY(EAP, TIMEOUT_FAILURE2);
611
612 sm->eap_if.eapTimeout = TRUE;
613 }
614
615
SM_STATE(EAP,FAILURE2)616 SM_STATE(EAP, FAILURE2)
617 {
618 SM_ENTRY(EAP, FAILURE2);
619
620 eap_copy_buf(&sm->eap_if.eapReqData, sm->eap_if.aaaEapReqData);
621 sm->eap_if.eapFail = TRUE;
622 }
623
624
SM_STATE(EAP,SUCCESS2)625 SM_STATE(EAP, SUCCESS2)
626 {
627 SM_ENTRY(EAP, SUCCESS2);
628
629 eap_copy_buf(&sm->eap_if.eapReqData, sm->eap_if.aaaEapReqData);
630
631 sm->eap_if.eapKeyAvailable = sm->eap_if.aaaEapKeyAvailable;
632 if (sm->eap_if.aaaEapKeyAvailable) {
633 EAP_COPY(&sm->eap_if.eapKeyData, sm->eap_if.aaaEapKeyData);
634 } else {
635 bin_clear_free(sm->eap_if.eapKeyData, sm->eap_if.eapKeyDataLen);
636 sm->eap_if.eapKeyData = NULL;
637 sm->eap_if.eapKeyDataLen = 0;
638 }
639
640 sm->eap_if.eapSuccess = TRUE;
641
642 /*
643 * Start reauthentication with identity request even though we know the
644 * previously used identity. This is needed to get reauthentication
645 * started properly.
646 */
647 sm->start_reauth = TRUE;
648 }
649
650
SM_STEP(EAP)651 SM_STEP(EAP)
652 {
653 if (sm->eap_if.eapRestart && sm->eap_if.portEnabled)
654 SM_ENTER_GLOBAL(EAP, INITIALIZE);
655 else if (!sm->eap_if.portEnabled)
656 SM_ENTER_GLOBAL(EAP, DISABLED);
657 else if (sm->num_rounds > EAP_MAX_AUTH_ROUNDS) {
658 if (sm->num_rounds == EAP_MAX_AUTH_ROUNDS + 1) {
659 wpa_printf(MSG_DEBUG, "EAP: more than %d "
660 "authentication rounds - abort",
661 EAP_MAX_AUTH_ROUNDS);
662 sm->num_rounds++;
663 SM_ENTER_GLOBAL(EAP, FAILURE);
664 }
665 } else switch (sm->EAP_state) {
666 case EAP_INITIALIZE:
667 if (sm->backend_auth) {
668 if (!sm->rxResp)
669 SM_ENTER(EAP, SELECT_ACTION);
670 else if (sm->rxResp &&
671 (sm->respMethod == EAP_TYPE_NAK ||
672 (sm->respMethod == EAP_TYPE_EXPANDED &&
673 sm->respVendor == EAP_VENDOR_IETF &&
674 sm->respVendorMethod == EAP_TYPE_NAK)))
675 SM_ENTER(EAP, NAK);
676 else
677 SM_ENTER(EAP, PICK_UP_METHOD);
678 } else {
679 SM_ENTER(EAP, SELECT_ACTION);
680 }
681 break;
682 case EAP_PICK_UP_METHOD:
683 if (sm->currentMethod == EAP_TYPE_NONE) {
684 SM_ENTER(EAP, SELECT_ACTION);
685 } else {
686 SM_ENTER(EAP, METHOD_RESPONSE);
687 }
688 break;
689 case EAP_DISABLED:
690 if (sm->eap_if.portEnabled)
691 SM_ENTER(EAP, INITIALIZE);
692 break;
693 case EAP_IDLE:
694 if (sm->eap_if.retransWhile == 0)
695 SM_ENTER(EAP, RETRANSMIT);
696 else if (sm->eap_if.eapResp)
697 SM_ENTER(EAP, RECEIVED);
698 break;
699 case EAP_RETRANSMIT:
700 if (sm->retransCount > sm->MaxRetrans)
701 SM_ENTER(EAP, TIMEOUT_FAILURE);
702 else
703 SM_ENTER(EAP, IDLE);
704 break;
705 case EAP_RECEIVED:
706 if (sm->rxResp && (sm->respId == sm->currentId) &&
707 (sm->respMethod == EAP_TYPE_NAK ||
708 (sm->respMethod == EAP_TYPE_EXPANDED &&
709 sm->respVendor == EAP_VENDOR_IETF &&
710 sm->respVendorMethod == EAP_TYPE_NAK))
711 && (sm->methodState == METHOD_PROPOSED))
712 SM_ENTER(EAP, NAK);
713 else if (sm->rxResp && (sm->respId == sm->currentId) &&
714 ((sm->respMethod == sm->currentMethod) ||
715 (sm->respMethod == EAP_TYPE_EXPANDED &&
716 sm->respVendor == EAP_VENDOR_IETF &&
717 sm->respVendorMethod == sm->currentMethod)))
718 SM_ENTER(EAP, INTEGRITY_CHECK);
719 else {
720 wpa_printf(MSG_DEBUG, "EAP: RECEIVED->DISCARD: "
721 "rxResp=%d respId=%d currentId=%d "
722 "respMethod=%d currentMethod=%d",
723 sm->rxResp, sm->respId, sm->currentId,
724 sm->respMethod, sm->currentMethod);
725 eap_log_msg(sm, "Discard received EAP message");
726 SM_ENTER(EAP, DISCARD);
727 }
728 break;
729 case EAP_DISCARD:
730 SM_ENTER(EAP, IDLE);
731 break;
732 case EAP_SEND_REQUEST:
733 SM_ENTER(EAP, IDLE);
734 break;
735 case EAP_INTEGRITY_CHECK:
736 if (sm->ignore)
737 SM_ENTER(EAP, DISCARD);
738 else
739 SM_ENTER(EAP, METHOD_RESPONSE);
740 break;
741 case EAP_METHOD_REQUEST:
742 if (sm->m == NULL) {
743 /*
744 * This transition is not mentioned in RFC 4137, but it
745 * is needed to handle cleanly a case where EAP method
746 * initialization fails.
747 */
748 SM_ENTER(EAP, FAILURE);
749 break;
750 }
751 SM_ENTER(EAP, SEND_REQUEST);
752 break;
753 case EAP_METHOD_RESPONSE:
754 /*
755 * Note: Mechanism to allow EAP methods to wait while going
756 * through pending processing is an extension to RFC 4137
757 * which only defines the transits to SELECT_ACTION and
758 * METHOD_REQUEST from this METHOD_RESPONSE state.
759 */
760 if (sm->methodState == METHOD_END)
761 SM_ENTER(EAP, SELECT_ACTION);
762 else if (sm->method_pending == METHOD_PENDING_WAIT) {
763 wpa_printf(MSG_DEBUG, "EAP: Method has pending "
764 "processing - wait before proceeding to "
765 "METHOD_REQUEST state");
766 } else if (sm->method_pending == METHOD_PENDING_CONT) {
767 wpa_printf(MSG_DEBUG, "EAP: Method has completed "
768 "pending processing - reprocess pending "
769 "EAP message");
770 sm->method_pending = METHOD_PENDING_NONE;
771 SM_ENTER(EAP, METHOD_RESPONSE);
772 } else
773 SM_ENTER(EAP, METHOD_REQUEST);
774 break;
775 case EAP_PROPOSE_METHOD:
776 /*
777 * Note: Mechanism to allow EAP methods to wait while going
778 * through pending processing is an extension to RFC 4137
779 * which only defines the transit to METHOD_REQUEST from this
780 * PROPOSE_METHOD state.
781 */
782 if (sm->method_pending == METHOD_PENDING_WAIT) {
783 wpa_printf(MSG_DEBUG, "EAP: Method has pending "
784 "processing - wait before proceeding to "
785 "METHOD_REQUEST state");
786 if (sm->user_eap_method_index > 0)
787 sm->user_eap_method_index--;
788 } else if (sm->method_pending == METHOD_PENDING_CONT) {
789 wpa_printf(MSG_DEBUG, "EAP: Method has completed "
790 "pending processing - reprocess pending "
791 "EAP message");
792 sm->method_pending = METHOD_PENDING_NONE;
793 SM_ENTER(EAP, PROPOSE_METHOD);
794 } else
795 SM_ENTER(EAP, METHOD_REQUEST);
796 break;
797 case EAP_NAK:
798 SM_ENTER(EAP, SELECT_ACTION);
799 break;
800 case EAP_SELECT_ACTION:
801 if (sm->decision == DECISION_FAILURE)
802 SM_ENTER(EAP, FAILURE);
803 else if (sm->decision == DECISION_SUCCESS)
804 SM_ENTER(EAP, SUCCESS);
805 else if (sm->decision == DECISION_PASSTHROUGH)
806 SM_ENTER(EAP, INITIALIZE_PASSTHROUGH);
807 else
808 SM_ENTER(EAP, PROPOSE_METHOD);
809 break;
810 case EAP_TIMEOUT_FAILURE:
811 break;
812 case EAP_FAILURE:
813 break;
814 case EAP_SUCCESS:
815 break;
816
817 case EAP_INITIALIZE_PASSTHROUGH:
818 if (sm->currentId == -1)
819 SM_ENTER(EAP, AAA_IDLE);
820 else
821 SM_ENTER(EAP, AAA_REQUEST);
822 break;
823 case EAP_IDLE2:
824 if (sm->eap_if.eapResp)
825 SM_ENTER(EAP, RECEIVED2);
826 else if (sm->eap_if.retransWhile == 0)
827 SM_ENTER(EAP, RETRANSMIT2);
828 break;
829 case EAP_RETRANSMIT2:
830 if (sm->retransCount > sm->MaxRetrans)
831 SM_ENTER(EAP, TIMEOUT_FAILURE2);
832 else
833 SM_ENTER(EAP, IDLE2);
834 break;
835 case EAP_RECEIVED2:
836 if (sm->rxResp && (sm->respId == sm->currentId))
837 SM_ENTER(EAP, AAA_REQUEST);
838 else
839 SM_ENTER(EAP, DISCARD2);
840 break;
841 case EAP_DISCARD2:
842 SM_ENTER(EAP, IDLE2);
843 break;
844 case EAP_SEND_REQUEST2:
845 SM_ENTER(EAP, IDLE2);
846 break;
847 case EAP_AAA_REQUEST:
848 SM_ENTER(EAP, AAA_IDLE);
849 break;
850 case EAP_AAA_RESPONSE:
851 SM_ENTER(EAP, SEND_REQUEST2);
852 break;
853 case EAP_AAA_IDLE:
854 if (sm->eap_if.aaaFail)
855 SM_ENTER(EAP, FAILURE2);
856 else if (sm->eap_if.aaaSuccess)
857 SM_ENTER(EAP, SUCCESS2);
858 else if (sm->eap_if.aaaEapReq)
859 SM_ENTER(EAP, AAA_RESPONSE);
860 else if (sm->eap_if.aaaTimeout)
861 SM_ENTER(EAP, TIMEOUT_FAILURE2);
862 break;
863 case EAP_TIMEOUT_FAILURE2:
864 break;
865 case EAP_FAILURE2:
866 break;
867 case EAP_SUCCESS2:
868 break;
869 }
870 }
871
872
eap_sm_calculateTimeout(struct eap_sm * sm,int retransCount,int eapSRTT,int eapRTTVAR,int methodTimeout)873 static int eap_sm_calculateTimeout(struct eap_sm *sm, int retransCount,
874 int eapSRTT, int eapRTTVAR,
875 int methodTimeout)
876 {
877 int rto, i;
878
879 if (methodTimeout) {
880 /*
881 * EAP method (either internal or through AAA server, provided
882 * timeout hint. Use that as-is as a timeout for retransmitting
883 * the EAP request if no response is received.
884 */
885 wpa_printf(MSG_DEBUG, "EAP: retransmit timeout %d seconds "
886 "(from EAP method hint)", methodTimeout);
887 return methodTimeout;
888 }
889
890 /*
891 * RFC 3748 recommends algorithms described in RFC 2988 for estimation
892 * of the retransmission timeout. This should be implemented once
893 * round-trip time measurements are available. For nowm a simple
894 * backoff mechanism is used instead if there are no EAP method
895 * specific hints.
896 *
897 * SRTT = smoothed round-trip time
898 * RTTVAR = round-trip time variation
899 * RTO = retransmission timeout
900 */
901
902 /*
903 * RFC 2988, 2.1: before RTT measurement, set RTO to 3 seconds for
904 * initial retransmission and then double the RTO to provide back off
905 * per 5.5. Limit the maximum RTO to 20 seconds per RFC 3748, 4.3
906 * modified RTOmax.
907 */
908 rto = 3;
909 for (i = 0; i < retransCount; i++) {
910 rto *= 2;
911 if (rto >= 20) {
912 rto = 20;
913 break;
914 }
915 }
916
917 wpa_printf(MSG_DEBUG, "EAP: retransmit timeout %d seconds "
918 "(from dynamic back off; retransCount=%d)",
919 rto, retransCount);
920
921 return rto;
922 }
923
924
eap_sm_parseEapResp(struct eap_sm * sm,const struct wpabuf * resp)925 static void eap_sm_parseEapResp(struct eap_sm *sm, const struct wpabuf *resp)
926 {
927 const struct eap_hdr *hdr;
928 size_t plen;
929
930 /* parse rxResp, respId, respMethod */
931 sm->rxResp = FALSE;
932 sm->respId = -1;
933 sm->respMethod = EAP_TYPE_NONE;
934 sm->respVendor = EAP_VENDOR_IETF;
935 sm->respVendorMethod = EAP_TYPE_NONE;
936
937 if (resp == NULL || wpabuf_len(resp) < sizeof(*hdr)) {
938 wpa_printf(MSG_DEBUG, "EAP: parseEapResp: invalid resp=%p "
939 "len=%lu", resp,
940 resp ? (unsigned long) wpabuf_len(resp) : 0);
941 return;
942 }
943
944 hdr = wpabuf_head(resp);
945 plen = be_to_host16(hdr->length);
946 if (plen > wpabuf_len(resp)) {
947 wpa_printf(MSG_DEBUG, "EAP: Ignored truncated EAP-Packet "
948 "(len=%lu plen=%lu)",
949 (unsigned long) wpabuf_len(resp),
950 (unsigned long) plen);
951 return;
952 }
953
954 sm->respId = hdr->identifier;
955
956 if (hdr->code == EAP_CODE_RESPONSE)
957 sm->rxResp = TRUE;
958
959 if (plen > sizeof(*hdr)) {
960 u8 *pos = (u8 *) (hdr + 1);
961 sm->respMethod = *pos++;
962 if (sm->respMethod == EAP_TYPE_EXPANDED) {
963 if (plen < sizeof(*hdr) + 8) {
964 wpa_printf(MSG_DEBUG, "EAP: Ignored truncated "
965 "expanded EAP-Packet (plen=%lu)",
966 (unsigned long) plen);
967 return;
968 }
969 sm->respVendor = WPA_GET_BE24(pos);
970 pos += 3;
971 sm->respVendorMethod = WPA_GET_BE32(pos);
972 }
973 }
974
975 wpa_printf(MSG_DEBUG, "EAP: parseEapResp: rxResp=%d respId=%d "
976 "respMethod=%u respVendor=%u respVendorMethod=%u",
977 sm->rxResp, sm->respId, sm->respMethod, sm->respVendor,
978 sm->respVendorMethod);
979 }
980
981
eap_sm_getId(const struct wpabuf * data)982 static int eap_sm_getId(const struct wpabuf *data)
983 {
984 const struct eap_hdr *hdr;
985
986 if (data == NULL || wpabuf_len(data) < sizeof(*hdr))
987 return -1;
988
989 hdr = wpabuf_head(data);
990 wpa_printf(MSG_DEBUG, "EAP: getId: id=%d", hdr->identifier);
991 return hdr->identifier;
992 }
993
994
eap_sm_buildSuccess(struct eap_sm * sm,u8 id)995 static struct wpabuf * eap_sm_buildSuccess(struct eap_sm *sm, u8 id)
996 {
997 struct wpabuf *msg;
998 struct eap_hdr *resp;
999 wpa_printf(MSG_DEBUG, "EAP: Building EAP-Success (id=%d)", id);
1000
1001 msg = wpabuf_alloc(sizeof(*resp));
1002 if (msg == NULL)
1003 return NULL;
1004 resp = wpabuf_put(msg, sizeof(*resp));
1005 resp->code = EAP_CODE_SUCCESS;
1006 resp->identifier = id;
1007 resp->length = host_to_be16(sizeof(*resp));
1008
1009 return msg;
1010 }
1011
1012
eap_sm_buildFailure(struct eap_sm * sm,u8 id)1013 static struct wpabuf * eap_sm_buildFailure(struct eap_sm *sm, u8 id)
1014 {
1015 struct wpabuf *msg;
1016 struct eap_hdr *resp;
1017 wpa_printf(MSG_DEBUG, "EAP: Building EAP-Failure (id=%d)", id);
1018
1019 msg = wpabuf_alloc(sizeof(*resp));
1020 if (msg == NULL)
1021 return NULL;
1022 resp = wpabuf_put(msg, sizeof(*resp));
1023 resp->code = EAP_CODE_FAILURE;
1024 resp->identifier = id;
1025 resp->length = host_to_be16(sizeof(*resp));
1026
1027 return msg;
1028 }
1029
1030
eap_sm_nextId(struct eap_sm * sm,int id)1031 static int eap_sm_nextId(struct eap_sm *sm, int id)
1032 {
1033 if (id < 0) {
1034 /* RFC 3748 Ch 4.1: recommended to initialize Identifier with a
1035 * random number */
1036 id = rand() & 0xff;
1037 if (id != sm->lastId)
1038 return id;
1039 }
1040 return (id + 1) & 0xff;
1041 }
1042
1043
1044 /**
1045 * eap_sm_process_nak - Process EAP-Response/Nak
1046 * @sm: Pointer to EAP state machine allocated with eap_server_sm_init()
1047 * @nak_list: Nak list (allowed methods) from the supplicant
1048 * @len: Length of nak_list in bytes
1049 *
1050 * This function is called when EAP-Response/Nak is received from the
1051 * supplicant. This can happen for both phase 1 and phase 2 authentications.
1052 */
eap_sm_process_nak(struct eap_sm * sm,const u8 * nak_list,size_t len)1053 void eap_sm_process_nak(struct eap_sm *sm, const u8 *nak_list, size_t len)
1054 {
1055 int i;
1056 size_t j;
1057
1058 if (sm->user == NULL)
1059 return;
1060
1061 wpa_printf(MSG_MSGDUMP, "EAP: processing NAK (current EAP method "
1062 "index %d)", sm->user_eap_method_index);
1063
1064 wpa_hexdump(MSG_MSGDUMP, "EAP: configured methods",
1065 (u8 *) sm->user->methods,
1066 EAP_MAX_METHODS * sizeof(sm->user->methods[0]));
1067 wpa_hexdump(MSG_MSGDUMP, "EAP: list of methods supported by the peer",
1068 nak_list, len);
1069
1070 i = sm->user_eap_method_index;
1071 while (i < EAP_MAX_METHODS &&
1072 (sm->user->methods[i].vendor != EAP_VENDOR_IETF ||
1073 sm->user->methods[i].method != EAP_TYPE_NONE)) {
1074 if (sm->user->methods[i].vendor != EAP_VENDOR_IETF)
1075 goto not_found;
1076 for (j = 0; j < len; j++) {
1077 if (nak_list[j] == sm->user->methods[i].method) {
1078 break;
1079 }
1080 }
1081
1082 if (j < len) {
1083 /* found */
1084 i++;
1085 continue;
1086 }
1087
1088 not_found:
1089 /* not found - remove from the list */
1090 if (i + 1 < EAP_MAX_METHODS) {
1091 os_memmove(&sm->user->methods[i],
1092 &sm->user->methods[i + 1],
1093 (EAP_MAX_METHODS - i - 1) *
1094 sizeof(sm->user->methods[0]));
1095 }
1096 sm->user->methods[EAP_MAX_METHODS - 1].vendor =
1097 EAP_VENDOR_IETF;
1098 sm->user->methods[EAP_MAX_METHODS - 1].method = EAP_TYPE_NONE;
1099 }
1100
1101 wpa_hexdump(MSG_MSGDUMP, "EAP: new list of configured methods",
1102 (u8 *) sm->user->methods, EAP_MAX_METHODS *
1103 sizeof(sm->user->methods[0]));
1104 }
1105
1106
eap_sm_Policy_update(struct eap_sm * sm,const u8 * nak_list,size_t len)1107 static void eap_sm_Policy_update(struct eap_sm *sm, const u8 *nak_list,
1108 size_t len)
1109 {
1110 if (nak_list == NULL || sm == NULL || sm->user == NULL)
1111 return;
1112
1113 if (sm->user->phase2) {
1114 wpa_printf(MSG_DEBUG, "EAP: EAP-Nak received after Phase2 user"
1115 " info was selected - reject");
1116 sm->decision = DECISION_FAILURE;
1117 return;
1118 }
1119
1120 eap_sm_process_nak(sm, nak_list, len);
1121 }
1122
1123
eap_sm_Policy_getNextMethod(struct eap_sm * sm,int * vendor)1124 static EapType eap_sm_Policy_getNextMethod(struct eap_sm *sm, int *vendor)
1125 {
1126 EapType next;
1127 int idx = sm->user_eap_method_index;
1128
1129 /* In theory, there should be no problems with starting
1130 * re-authentication with something else than EAP-Request/Identity and
1131 * this does indeed work with wpa_supplicant. However, at least Funk
1132 * Supplicant seemed to ignore re-auth if it skipped
1133 * EAP-Request/Identity.
1134 * Re-auth sets currentId == -1, so that can be used here to select
1135 * whether Identity needs to be requested again. */
1136 if (sm->identity == NULL || sm->currentId == -1) {
1137 *vendor = EAP_VENDOR_IETF;
1138 next = EAP_TYPE_IDENTITY;
1139 sm->update_user = TRUE;
1140 } else if (sm->user && idx < EAP_MAX_METHODS &&
1141 (sm->user->methods[idx].vendor != EAP_VENDOR_IETF ||
1142 sm->user->methods[idx].method != EAP_TYPE_NONE)) {
1143 *vendor = sm->user->methods[idx].vendor;
1144 next = sm->user->methods[idx].method;
1145 sm->user_eap_method_index++;
1146 } else {
1147 *vendor = EAP_VENDOR_IETF;
1148 next = EAP_TYPE_NONE;
1149 }
1150 wpa_printf(MSG_DEBUG, "EAP: getNextMethod: vendor %d type %d",
1151 *vendor, next);
1152 return next;
1153 }
1154
1155
eap_sm_Policy_getDecision(struct eap_sm * sm)1156 static int eap_sm_Policy_getDecision(struct eap_sm *sm)
1157 {
1158 if (!sm->eap_server && sm->identity && !sm->start_reauth) {
1159 wpa_printf(MSG_DEBUG, "EAP: getDecision: -> PASSTHROUGH");
1160 return DECISION_PASSTHROUGH;
1161 }
1162
1163 if (sm->m && sm->currentMethod != EAP_TYPE_IDENTITY &&
1164 sm->m->isSuccess(sm, sm->eap_method_priv)) {
1165 wpa_printf(MSG_DEBUG, "EAP: getDecision: method succeeded -> "
1166 "SUCCESS");
1167 sm->update_user = TRUE;
1168 return DECISION_SUCCESS;
1169 }
1170
1171 if (sm->m && sm->m->isDone(sm, sm->eap_method_priv) &&
1172 !sm->m->isSuccess(sm, sm->eap_method_priv)) {
1173 wpa_printf(MSG_DEBUG, "EAP: getDecision: method failed -> "
1174 "FAILURE");
1175 sm->update_user = TRUE;
1176 return DECISION_FAILURE;
1177 }
1178
1179 if ((sm->user == NULL || sm->update_user) && sm->identity &&
1180 !sm->start_reauth) {
1181 /*
1182 * Allow Identity method to be started once to allow identity
1183 * selection hint to be sent from the authentication server,
1184 * but prevent a loop of Identity requests by only allowing
1185 * this to happen once.
1186 */
1187 int id_req = 0;
1188 if (sm->user && sm->currentMethod == EAP_TYPE_IDENTITY &&
1189 sm->user->methods[0].vendor == EAP_VENDOR_IETF &&
1190 sm->user->methods[0].method == EAP_TYPE_IDENTITY)
1191 id_req = 1;
1192 if (eap_user_get(sm, sm->identity, sm->identity_len, 0) != 0) {
1193 wpa_printf(MSG_DEBUG, "EAP: getDecision: user not "
1194 "found from database -> FAILURE");
1195 return DECISION_FAILURE;
1196 }
1197 if (id_req && sm->user &&
1198 sm->user->methods[0].vendor == EAP_VENDOR_IETF &&
1199 sm->user->methods[0].method == EAP_TYPE_IDENTITY) {
1200 wpa_printf(MSG_DEBUG, "EAP: getDecision: stop "
1201 "identity request loop -> FAILURE");
1202 sm->update_user = TRUE;
1203 return DECISION_FAILURE;
1204 }
1205 sm->update_user = FALSE;
1206 }
1207 sm->start_reauth = FALSE;
1208
1209 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
1210 (sm->user->methods[sm->user_eap_method_index].vendor !=
1211 EAP_VENDOR_IETF ||
1212 sm->user->methods[sm->user_eap_method_index].method !=
1213 EAP_TYPE_NONE)) {
1214 wpa_printf(MSG_DEBUG, "EAP: getDecision: another method "
1215 "available -> CONTINUE");
1216 return DECISION_CONTINUE;
1217 }
1218
1219 if (sm->identity == NULL || sm->currentId == -1) {
1220 wpa_printf(MSG_DEBUG, "EAP: getDecision: no identity known "
1221 "yet -> CONTINUE");
1222 return DECISION_CONTINUE;
1223 }
1224
1225 wpa_printf(MSG_DEBUG, "EAP: getDecision: no more methods available -> "
1226 "FAILURE");
1227 return DECISION_FAILURE;
1228 }
1229
1230
eap_sm_Policy_doPickUp(struct eap_sm * sm,EapType method)1231 static Boolean eap_sm_Policy_doPickUp(struct eap_sm *sm, EapType method)
1232 {
1233 return method == EAP_TYPE_IDENTITY ? TRUE : FALSE;
1234 }
1235
1236
1237 /**
1238 * eap_server_sm_step - Step EAP server state machine
1239 * @sm: Pointer to EAP state machine allocated with eap_server_sm_init()
1240 * Returns: 1 if EAP state was changed or 0 if not
1241 *
1242 * This function advances EAP state machine to a new state to match with the
1243 * current variables. This should be called whenever variables used by the EAP
1244 * state machine have changed.
1245 */
eap_server_sm_step(struct eap_sm * sm)1246 int eap_server_sm_step(struct eap_sm *sm)
1247 {
1248 int res = 0;
1249 do {
1250 sm->changed = FALSE;
1251 SM_STEP_RUN(EAP);
1252 if (sm->changed)
1253 res = 1;
1254 } while (sm->changed);
1255 return res;
1256 }
1257
1258
eap_user_free(struct eap_user * user)1259 static void eap_user_free(struct eap_user *user)
1260 {
1261 if (user == NULL)
1262 return;
1263 bin_clear_free(user->password, user->password_len);
1264 user->password = NULL;
1265 os_free(user);
1266 }
1267
1268
1269 /**
1270 * eap_server_sm_init - Allocate and initialize EAP server state machine
1271 * @eapol_ctx: Context data to be used with eapol_cb calls
1272 * @eapol_cb: Pointer to EAPOL callback functions
1273 * @conf: EAP configuration
1274 * Returns: Pointer to the allocated EAP state machine or %NULL on failure
1275 *
1276 * This function allocates and initializes an EAP state machine.
1277 */
eap_server_sm_init(void * eapol_ctx,struct eapol_callbacks * eapol_cb,struct eap_config * conf)1278 struct eap_sm * eap_server_sm_init(void *eapol_ctx,
1279 struct eapol_callbacks *eapol_cb,
1280 struct eap_config *conf)
1281 {
1282 struct eap_sm *sm;
1283
1284 sm = os_zalloc(sizeof(*sm));
1285 if (sm == NULL)
1286 return NULL;
1287 sm->eapol_ctx = eapol_ctx;
1288 sm->eapol_cb = eapol_cb;
1289 sm->MaxRetrans = 5; /* RFC 3748: max 3-5 retransmissions suggested */
1290 sm->ssl_ctx = conf->ssl_ctx;
1291 sm->msg_ctx = conf->msg_ctx;
1292 sm->eap_sim_db_priv = conf->eap_sim_db_priv;
1293 sm->backend_auth = conf->backend_auth;
1294 sm->eap_server = conf->eap_server;
1295 if (conf->pac_opaque_encr_key) {
1296 sm->pac_opaque_encr_key = os_malloc(16);
1297 if (sm->pac_opaque_encr_key) {
1298 os_memcpy(sm->pac_opaque_encr_key,
1299 conf->pac_opaque_encr_key, 16);
1300 }
1301 }
1302 if (conf->eap_fast_a_id) {
1303 sm->eap_fast_a_id = os_malloc(conf->eap_fast_a_id_len);
1304 if (sm->eap_fast_a_id) {
1305 os_memcpy(sm->eap_fast_a_id, conf->eap_fast_a_id,
1306 conf->eap_fast_a_id_len);
1307 sm->eap_fast_a_id_len = conf->eap_fast_a_id_len;
1308 }
1309 }
1310 if (conf->eap_fast_a_id_info)
1311 sm->eap_fast_a_id_info = os_strdup(conf->eap_fast_a_id_info);
1312 sm->eap_fast_prov = conf->eap_fast_prov;
1313 sm->pac_key_lifetime = conf->pac_key_lifetime;
1314 sm->pac_key_refresh_time = conf->pac_key_refresh_time;
1315 sm->eap_sim_aka_result_ind = conf->eap_sim_aka_result_ind;
1316 sm->tnc = conf->tnc;
1317 sm->wps = conf->wps;
1318 if (conf->assoc_wps_ie)
1319 sm->assoc_wps_ie = wpabuf_dup(conf->assoc_wps_ie);
1320 if (conf->assoc_p2p_ie)
1321 sm->assoc_p2p_ie = wpabuf_dup(conf->assoc_p2p_ie);
1322 if (conf->peer_addr)
1323 os_memcpy(sm->peer_addr, conf->peer_addr, ETH_ALEN);
1324 sm->fragment_size = conf->fragment_size;
1325 sm->pwd_group = conf->pwd_group;
1326 sm->pbc_in_m1 = conf->pbc_in_m1;
1327 sm->server_id = conf->server_id;
1328 sm->server_id_len = conf->server_id_len;
1329
1330 #ifdef CONFIG_TESTING_OPTIONS
1331 sm->tls_test_flags = conf->tls_test_flags;
1332 #endif /* CONFIG_TESTING_OPTIONS */
1333
1334 wpa_printf(MSG_DEBUG, "EAP: Server state machine created");
1335
1336 return sm;
1337 }
1338
1339
1340 /**
1341 * eap_server_sm_deinit - Deinitialize and free an EAP server state machine
1342 * @sm: Pointer to EAP state machine allocated with eap_server_sm_init()
1343 *
1344 * This function deinitializes EAP state machine and frees all allocated
1345 * resources.
1346 */
eap_server_sm_deinit(struct eap_sm * sm)1347 void eap_server_sm_deinit(struct eap_sm *sm)
1348 {
1349 if (sm == NULL)
1350 return;
1351 wpa_printf(MSG_DEBUG, "EAP: Server state machine removed");
1352 if (sm->m && sm->eap_method_priv)
1353 sm->m->reset(sm, sm->eap_method_priv);
1354 wpabuf_free(sm->eap_if.eapReqData);
1355 bin_clear_free(sm->eap_if.eapKeyData, sm->eap_if.eapKeyDataLen);
1356 wpabuf_free(sm->lastReqData);
1357 wpabuf_free(sm->eap_if.eapRespData);
1358 os_free(sm->identity);
1359 os_free(sm->pac_opaque_encr_key);
1360 os_free(sm->eap_fast_a_id);
1361 os_free(sm->eap_fast_a_id_info);
1362 wpabuf_free(sm->eap_if.aaaEapReqData);
1363 wpabuf_free(sm->eap_if.aaaEapRespData);
1364 bin_clear_free(sm->eap_if.aaaEapKeyData, sm->eap_if.aaaEapKeyDataLen);
1365 eap_user_free(sm->user);
1366 wpabuf_free(sm->assoc_wps_ie);
1367 wpabuf_free(sm->assoc_p2p_ie);
1368 os_free(sm);
1369 }
1370
1371
1372 /**
1373 * eap_sm_notify_cached - Notify EAP state machine of cached PMK
1374 * @sm: Pointer to EAP state machine allocated with eap_server_sm_init()
1375 *
1376 * This function is called when PMKSA caching is used to skip EAP
1377 * authentication.
1378 */
eap_sm_notify_cached(struct eap_sm * sm)1379 void eap_sm_notify_cached(struct eap_sm *sm)
1380 {
1381 if (sm == NULL)
1382 return;
1383
1384 sm->EAP_state = EAP_SUCCESS;
1385 }
1386
1387
1388 /**
1389 * eap_sm_pending_cb - EAP state machine callback for a pending EAP request
1390 * @sm: Pointer to EAP state machine allocated with eap_server_sm_init()
1391 *
1392 * This function is called when data for a pending EAP-Request is received.
1393 */
eap_sm_pending_cb(struct eap_sm * sm)1394 void eap_sm_pending_cb(struct eap_sm *sm)
1395 {
1396 if (sm == NULL)
1397 return;
1398 wpa_printf(MSG_DEBUG, "EAP: Callback for pending request received");
1399 if (sm->method_pending == METHOD_PENDING_WAIT)
1400 sm->method_pending = METHOD_PENDING_CONT;
1401 }
1402
1403
1404 /**
1405 * eap_sm_method_pending - Query whether EAP method is waiting for pending data
1406 * @sm: Pointer to EAP state machine allocated with eap_server_sm_init()
1407 * Returns: 1 if method is waiting for pending data or 0 if not
1408 */
eap_sm_method_pending(struct eap_sm * sm)1409 int eap_sm_method_pending(struct eap_sm *sm)
1410 {
1411 if (sm == NULL)
1412 return 0;
1413 return sm->method_pending == METHOD_PENDING_WAIT;
1414 }
1415
1416
1417 /**
1418 * eap_get_identity - Get the user identity (from EAP-Response/Identity)
1419 * @sm: Pointer to EAP state machine allocated with eap_server_sm_init()
1420 * @len: Buffer for returning identity length
1421 * Returns: Pointer to the user identity or %NULL if not available
1422 */
eap_get_identity(struct eap_sm * sm,size_t * len)1423 const u8 * eap_get_identity(struct eap_sm *sm, size_t *len)
1424 {
1425 *len = sm->identity_len;
1426 return sm->identity;
1427 }
1428
1429
1430 /**
1431 * eap_get_interface - Get pointer to EAP-EAPOL interface data
1432 * @sm: Pointer to EAP state machine allocated with eap_server_sm_init()
1433 * Returns: Pointer to the EAP-EAPOL interface data
1434 */
eap_get_interface(struct eap_sm * sm)1435 struct eap_eapol_interface * eap_get_interface(struct eap_sm *sm)
1436 {
1437 return &sm->eap_if;
1438 }
1439
1440
1441 /**
1442 * eap_server_clear_identity - Clear EAP identity information
1443 * @sm: Pointer to EAP state machine allocated with eap_server_sm_init()
1444 *
1445 * This function can be used to clear the EAP identity information in the EAP
1446 * server context. This allows the EAP/Identity method to be used again after
1447 * EAPOL-Start or EAPOL-Logoff.
1448 */
eap_server_clear_identity(struct eap_sm * sm)1449 void eap_server_clear_identity(struct eap_sm *sm)
1450 {
1451 os_free(sm->identity);
1452 sm->identity = NULL;
1453 }
1454