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1 /*
2  * EAPOL supplicant state machines
3  * Copyright (c) 2004-2012, Jouni Malinen <j@w1.fi>
4  *
5  * This software may be distributed under the terms of the BSD license.
6  * See README for more details.
7  */
8 
9 #ifndef EAPOL_SUPP_SM_H
10 #define EAPOL_SUPP_SM_H
11 
12 #include "common/defs.h"
13 
14 typedef enum { Unauthorized, Authorized } PortStatus;
15 typedef enum { Auto, ForceUnauthorized, ForceAuthorized } PortControl;
16 
17 /**
18  * struct eapol_config - Per network configuration for EAPOL state machines
19  */
20 struct eapol_config {
21 	/**
22 	 * accept_802_1x_keys - Accept IEEE 802.1X (non-WPA) EAPOL-Key frames
23 	 *
24 	 * This variable should be set to 1 when using EAPOL state machines
25 	 * with non-WPA security policy to generate dynamic WEP keys. When
26 	 * using WPA, this should be set to 0 so that WPA state machine can
27 	 * process the EAPOL-Key frames.
28 	 */
29 	int accept_802_1x_keys;
30 
31 #define EAPOL_REQUIRE_KEY_UNICAST BIT(0)
32 #define EAPOL_REQUIRE_KEY_BROADCAST BIT(1)
33 	/**
34 	 * required_keys - Which EAPOL-Key packets are required
35 	 *
36 	 * This variable determines which EAPOL-Key packets are required before
37 	 * marking connection authenticated. This is a bit field of
38 	 * EAPOL_REQUIRE_KEY_UNICAST and EAPOL_REQUIRE_KEY_BROADCAST flags.
39 	 */
40 	int required_keys;
41 
42 	/**
43 	 * fast_reauth - Whether fast EAP reauthentication is enabled
44 	 */
45 	int fast_reauth;
46 
47 	/**
48 	 * workaround - Whether EAP workarounds are enabled
49 	 */
50 	unsigned int workaround;
51 
52 	/**
53 	 * eap_disabled - Whether EAP is disabled
54 	 */
55 	int eap_disabled;
56 
57 	/**
58 	 * external_sim - Use external processing for SIM/USIM operations
59 	 */
60 	int external_sim;
61 
62 #define EAPOL_LOCAL_WPS_IN_USE BIT(0)
63 #define EAPOL_PEER_IS_WPS20_AP BIT(1)
64 	/**
65 	 * wps - Whether this connection is used for WPS
66 	 */
67 	int wps;
68 };
69 
70 struct eapol_sm;
71 struct wpa_config_blob;
72 
73 enum eapol_supp_result {
74 	EAPOL_SUPP_RESULT_FAILURE,
75 	EAPOL_SUPP_RESULT_SUCCESS,
76 	EAPOL_SUPP_RESULT_EXPECTED_FAILURE
77 };
78 
79 /**
80  * struct eapol_ctx - Global (for all networks) EAPOL state machine context
81  */
82 struct eapol_ctx {
83 	/**
84 	 * ctx - Pointer to arbitrary upper level context
85 	 */
86 	void *ctx;
87 
88 	/**
89 	 * preauth - IEEE 802.11i/RSN pre-authentication
90 	 *
91 	 * This EAPOL state machine is used for IEEE 802.11i/RSN
92 	 * pre-authentication
93 	 */
94 	int preauth;
95 
96 	/**
97 	 * cb - Function to be called when EAPOL negotiation has been completed
98 	 * @eapol: Pointer to EAPOL state machine data
99 	 * @result: Whether the authentication was completed successfully
100 	 * @ctx: Pointer to context data (cb_ctx)
101 	 *
102 	 * This optional callback function will be called when the EAPOL
103 	 * authentication has been completed. This allows the owner of the
104 	 * EAPOL state machine to process the key and terminate the EAPOL state
105 	 * machine. Currently, this is used only in RSN pre-authentication.
106 	 */
107 	void (*cb)(struct eapol_sm *eapol, enum eapol_supp_result result,
108 		   void *ctx);
109 
110 	/**
111 	 * cb_ctx - Callback context for cb()
112 	 */
113 	void *cb_ctx;
114 
115 	/**
116 	 * msg_ctx - Callback context for wpa_msg() calls
117 	 */
118 	void *msg_ctx;
119 
120 	/**
121 	 * scard_ctx - Callback context for PC/SC scard_*() function calls
122 	 *
123 	 * This context can be updated with eapol_sm_register_scard_ctx().
124 	 */
125 	void *scard_ctx;
126 
127 	/**
128 	 * eapol_send_ctx - Callback context for eapol_send() calls
129 	 */
130 	void *eapol_send_ctx;
131 
132 	/**
133 	 * eapol_done_cb - Function to be called at successful completion
134 	 * @ctx: Callback context (ctx)
135 	 *
136 	 * This function is called at the successful completion of EAPOL
137 	 * authentication. If dynamic WEP keys are used, this is called only
138 	 * after all the expected keys have been received.
139 	 */
140 	void (*eapol_done_cb)(void *ctx);
141 
142 	/**
143 	 * eapol_send - Send EAPOL packets
144 	 * @ctx: Callback context (eapol_send_ctx)
145 	 * @type: EAPOL type (IEEE802_1X_TYPE_*)
146 	 * @buf: Pointer to EAPOL payload
147 	 * @len: Length of the EAPOL payload
148 	 * Returns: 0 on success, -1 on failure
149 	 */
150 	int (*eapol_send)(void *ctx, int type, const u8 *buf, size_t len);
151 
152 	/**
153 	 * set_wep_key - Configure WEP keys
154 	 * @ctx: Callback context (ctx)
155 	 * @unicast: Non-zero = unicast, 0 = multicast/broadcast key
156 	 * @keyidx: Key index (0..3)
157 	 * @key: WEP key
158 	 * @keylen: Length of the WEP key
159 	 * Returns: 0 on success, -1 on failure
160 	 */
161 	int (*set_wep_key)(void *ctx, int unicast, int keyidx,
162 			   const u8 *key, size_t keylen);
163 
164 	/**
165 	 * set_config_blob - Set or add a named configuration blob
166 	 * @ctx: Callback context (ctx)
167 	 * @blob: New value for the blob
168 	 *
169 	 * Adds a new configuration blob or replaces the current value of an
170 	 * existing blob.
171 	 */
172 	void (*set_config_blob)(void *ctx, struct wpa_config_blob *blob);
173 
174 	/**
175 	 * get_config_blob - Get a named configuration blob
176 	 * @ctx: Callback context (ctx)
177 	 * @name: Name of the blob
178 	 * Returns: Pointer to blob data or %NULL if not found
179 	 */
180 	const struct wpa_config_blob * (*get_config_blob)(void *ctx,
181 							  const char *name);
182 
183 	/**
184 	 * aborted_cached - Notify that cached PMK attempt was aborted
185 	 * @ctx: Callback context (ctx)
186 	 */
187 	void (*aborted_cached)(void *ctx);
188 
189 	/**
190 	 * opensc_engine_path - Path to the OpenSSL engine for opensc
191 	 *
192 	 * This is an OpenSSL specific configuration option for loading OpenSC
193 	 * engine (engine_opensc.so); if %NULL, this engine is not loaded.
194 	 */
195 	const char *opensc_engine_path;
196 
197 	/**
198 	 * pkcs11_engine_path - Path to the OpenSSL engine for PKCS#11
199 	 *
200 	 * This is an OpenSSL specific configuration option for loading PKCS#11
201 	 * engine (engine_pkcs11.so); if %NULL, this engine is not loaded.
202 	 */
203 	const char *pkcs11_engine_path;
204 
205 	/**
206 	 * pkcs11_module_path - Path to the OpenSSL OpenSC/PKCS#11 module
207 	 *
208 	 * This is an OpenSSL specific configuration option for configuring
209 	 * path to OpenSC/PKCS#11 engine (opensc-pkcs11.so); if %NULL, this
210 	 * module is not loaded.
211 	 */
212 	const char *pkcs11_module_path;
213 
214 	/**
215 	 * openssl_ciphers - OpenSSL cipher string
216 	 *
217 	 * This is an OpenSSL specific configuration option for configuring the
218 	 * default ciphers. If not set, "DEFAULT:!EXP:!LOW" is used as the
219 	 * default.
220 	 */
221 	const char *openssl_ciphers;
222 
223 	/**
224 	 * wps - WPS context data
225 	 *
226 	 * This is only used by EAP-WSC and can be left %NULL if not available.
227 	 */
228 	struct wps_context *wps;
229 
230 	/**
231 	 * eap_param_needed - Notify that EAP parameter is needed
232 	 * @ctx: Callback context (ctx)
233 	 * @field: Field indicator (e.g., WPA_CTRL_REQ_EAP_IDENTITY)
234 	 * @txt: User readable text describing the required parameter
235 	 */
236 	void (*eap_param_needed)(void *ctx, enum wpa_ctrl_req_type field,
237 				 const char *txt);
238 
239 	/**
240 	 * port_cb - Set port authorized/unauthorized callback (optional)
241 	 * @ctx: Callback context (ctx)
242 	 * @authorized: Whether the supplicant port is now in authorized state
243 	 */
244 	void (*port_cb)(void *ctx, int authorized);
245 
246 	/**
247 	 * cert_cb - Notification of a peer certificate
248 	 * @ctx: Callback context (ctx)
249 	 * @depth: Depth in certificate chain (0 = server)
250 	 * @subject: Subject of the peer certificate
251 	 * @altsubject: Select fields from AltSubject of the peer certificate
252 	 * @num_altsubject: Number of altsubject values
253 	 * @cert_hash: SHA-256 hash of the certificate
254 	 * @cert: Peer certificate
255 	 */
256 	void (*cert_cb)(void *ctx, int depth, const char *subject,
257 			const char *altsubject[], int num_altsubject,
258 			const char *cert_hash, const struct wpabuf *cert);
259 
260 	/**
261 	 * cert_in_cb - Include server certificates in callback
262 	 */
263 	int cert_in_cb;
264 
265 	/**
266 	 * status_cb - Notification of a change in EAP status
267 	 * @ctx: Callback context (ctx)
268 	 * @status: Step in the process of EAP authentication
269 	 * @parameter: Step-specific parameter, e.g., EAP method name
270 	 */
271 	void (*status_cb)(void *ctx, const char *status,
272 			  const char *parameter);
273 
274 #ifdef CONFIG_EAP_PROXY
275 	/**
276 	 * eap_proxy_cb - Callback signifying any updates from eap_proxy
277 	 * @ctx: eapol_ctx from eap_peer_sm_init() call
278 	 */
279 	void (*eap_proxy_cb)(void *ctx);
280 
281 	/**
282 	 * eap_proxy_notify_sim_status - Notification of SIM status change
283 	 * @ctx: eapol_ctx from eap_peer_sm_init() call
284 	 * @status: One of enum value from sim_state
285 	 */
286 	void (*eap_proxy_notify_sim_status)(void *ctx,
287 					    enum eap_proxy_sim_state sim_state);
288 #endif /* CONFIG_EAP_PROXY */
289 
290 	/**
291 	 * set_anon_id - Set or add anonymous identity
292 	 * @ctx: eapol_ctx from eap_peer_sm_init() call
293 	 * @id: Anonymous identity (e.g., EAP-SIM pseudonym)
294 	 * @len: Length of anonymous identity in octets
295 	 */
296 	void (*set_anon_id)(void *ctx, const u8 *id, size_t len);
297 };
298 
299 
300 struct eap_peer_config;
301 struct ext_password_data;
302 
303 #ifdef IEEE8021X_EAPOL
304 struct eapol_sm *eapol_sm_init(struct eapol_ctx *ctx);
305 void eapol_sm_deinit(struct eapol_sm *sm);
306 void eapol_sm_step(struct eapol_sm *sm);
307 int eapol_sm_get_status(struct eapol_sm *sm, char *buf, size_t buflen,
308 			int verbose);
309 int eapol_sm_get_mib(struct eapol_sm *sm, char *buf, size_t buflen);
310 void eapol_sm_configure(struct eapol_sm *sm, int heldPeriod, int authPeriod,
311 			int startPeriod, int maxStart);
312 int eapol_sm_rx_eapol(struct eapol_sm *sm, const u8 *src, const u8 *buf,
313 		      size_t len);
314 void eapol_sm_notify_tx_eapol_key(struct eapol_sm *sm);
315 void eapol_sm_notify_portEnabled(struct eapol_sm *sm, Boolean enabled);
316 void eapol_sm_notify_portValid(struct eapol_sm *sm, Boolean valid);
317 void eapol_sm_notify_eap_success(struct eapol_sm *sm, Boolean success);
318 void eapol_sm_notify_eap_fail(struct eapol_sm *sm, Boolean fail);
319 void eapol_sm_notify_config(struct eapol_sm *sm,
320 			    struct eap_peer_config *config,
321 			    const struct eapol_config *conf);
322 int eapol_sm_get_key(struct eapol_sm *sm, u8 *key, size_t len);
323 const u8 * eapol_sm_get_session_id(struct eapol_sm *sm, size_t *len);
324 void eapol_sm_notify_logoff(struct eapol_sm *sm, Boolean logoff);
325 void eapol_sm_notify_cached(struct eapol_sm *sm);
326 void eapol_sm_notify_pmkid_attempt(struct eapol_sm *sm);
327 void eapol_sm_register_scard_ctx(struct eapol_sm *sm, void *ctx);
328 void eapol_sm_notify_portControl(struct eapol_sm *sm, PortControl portControl);
329 void eapol_sm_notify_ctrl_attached(struct eapol_sm *sm);
330 void eapol_sm_notify_ctrl_response(struct eapol_sm *sm);
331 void eapol_sm_request_reauth(struct eapol_sm *sm);
332 void eapol_sm_notify_lower_layer_success(struct eapol_sm *sm, int in_eapol_sm);
333 void eapol_sm_invalidate_cached_session(struct eapol_sm *sm);
334 const char * eapol_sm_get_method_name(struct eapol_sm *sm);
335 void eapol_sm_set_ext_pw_ctx(struct eapol_sm *sm,
336 			     struct ext_password_data *ext);
337 int eapol_sm_failed(struct eapol_sm *sm);
338 void eapol_sm_erp_flush(struct eapol_sm *sm);
339 struct wpabuf * eapol_sm_build_erp_reauth_start(struct eapol_sm *sm);
340 void eapol_sm_process_erp_finish(struct eapol_sm *sm, const u8 *buf,
341 				 size_t len);
342 int eapol_sm_get_eap_proxy_imsi(struct eapol_sm *sm, char *imsi, size_t *len);
343 #else /* IEEE8021X_EAPOL */
eapol_sm_init(struct eapol_ctx * ctx)344 static inline struct eapol_sm *eapol_sm_init(struct eapol_ctx *ctx)
345 {
346 	free(ctx);
347 	return (struct eapol_sm *) 1;
348 }
eapol_sm_deinit(struct eapol_sm * sm)349 static inline void eapol_sm_deinit(struct eapol_sm *sm)
350 {
351 }
eapol_sm_step(struct eapol_sm * sm)352 static inline void eapol_sm_step(struct eapol_sm *sm)
353 {
354 }
eapol_sm_get_status(struct eapol_sm * sm,char * buf,size_t buflen,int verbose)355 static inline int eapol_sm_get_status(struct eapol_sm *sm, char *buf,
356 				      size_t buflen, int verbose)
357 {
358 	return 0;
359 }
eapol_sm_get_mib(struct eapol_sm * sm,char * buf,size_t buflen)360 static inline int eapol_sm_get_mib(struct eapol_sm *sm, char *buf,
361 				   size_t buflen)
362 {
363 	return 0;
364 }
eapol_sm_configure(struct eapol_sm * sm,int heldPeriod,int authPeriod,int startPeriod,int maxStart)365 static inline void eapol_sm_configure(struct eapol_sm *sm, int heldPeriod,
366 				      int authPeriod, int startPeriod,
367 				      int maxStart)
368 {
369 }
eapol_sm_rx_eapol(struct eapol_sm * sm,const u8 * src,const u8 * buf,size_t len)370 static inline int eapol_sm_rx_eapol(struct eapol_sm *sm, const u8 *src,
371 				    const u8 *buf, size_t len)
372 {
373 	return 0;
374 }
eapol_sm_notify_tx_eapol_key(struct eapol_sm * sm)375 static inline void eapol_sm_notify_tx_eapol_key(struct eapol_sm *sm)
376 {
377 }
eapol_sm_notify_portEnabled(struct eapol_sm * sm,Boolean enabled)378 static inline void eapol_sm_notify_portEnabled(struct eapol_sm *sm,
379 					       Boolean enabled)
380 {
381 }
eapol_sm_notify_portValid(struct eapol_sm * sm,Boolean valid)382 static inline void eapol_sm_notify_portValid(struct eapol_sm *sm,
383 					     Boolean valid)
384 {
385 }
eapol_sm_notify_eap_success(struct eapol_sm * sm,Boolean success)386 static inline void eapol_sm_notify_eap_success(struct eapol_sm *sm,
387 					       Boolean success)
388 {
389 }
eapol_sm_notify_eap_fail(struct eapol_sm * sm,Boolean fail)390 static inline void eapol_sm_notify_eap_fail(struct eapol_sm *sm, Boolean fail)
391 {
392 }
eapol_sm_notify_config(struct eapol_sm * sm,struct eap_peer_config * config,struct eapol_config * conf)393 static inline void eapol_sm_notify_config(struct eapol_sm *sm,
394 					  struct eap_peer_config *config,
395 					  struct eapol_config *conf)
396 {
397 }
eapol_sm_get_key(struct eapol_sm * sm,u8 * key,size_t len)398 static inline int eapol_sm_get_key(struct eapol_sm *sm, u8 *key, size_t len)
399 {
400 	return -1;
401 }
402 static inline const u8 *
eapol_sm_get_session_id(struct eapol_sm * sm,size_t * len)403 eapol_sm_get_session_id(struct eapol_sm *sm, size_t *len)
404 {
405 	return NULL;
406 }
eapol_sm_notify_logoff(struct eapol_sm * sm,Boolean logoff)407 static inline void eapol_sm_notify_logoff(struct eapol_sm *sm, Boolean logoff)
408 {
409 }
eapol_sm_notify_cached(struct eapol_sm * sm)410 static inline void eapol_sm_notify_cached(struct eapol_sm *sm)
411 {
412 }
eapol_sm_notify_pmkid_attempt(struct eapol_sm * sm)413 static inline void eapol_sm_notify_pmkid_attempt(struct eapol_sm *sm)
414 {
415 }
416 #define eapol_sm_register_scard_ctx(sm, ctx) do { } while (0)
eapol_sm_notify_portControl(struct eapol_sm * sm,PortControl portControl)417 static inline void eapol_sm_notify_portControl(struct eapol_sm *sm,
418 					       PortControl portControl)
419 {
420 }
eapol_sm_notify_ctrl_attached(struct eapol_sm * sm)421 static inline void eapol_sm_notify_ctrl_attached(struct eapol_sm *sm)
422 {
423 }
eapol_sm_notify_ctrl_response(struct eapol_sm * sm)424 static inline void eapol_sm_notify_ctrl_response(struct eapol_sm *sm)
425 {
426 }
eapol_sm_request_reauth(struct eapol_sm * sm)427 static inline void eapol_sm_request_reauth(struct eapol_sm *sm)
428 {
429 }
eapol_sm_notify_lower_layer_success(struct eapol_sm * sm,int in_eapol_sm)430 static inline void eapol_sm_notify_lower_layer_success(struct eapol_sm *sm,
431 						       int in_eapol_sm)
432 {
433 }
eapol_sm_invalidate_cached_session(struct eapol_sm * sm)434 static inline void eapol_sm_invalidate_cached_session(struct eapol_sm *sm)
435 {
436 }
eapol_sm_get_method_name(struct eapol_sm * sm)437 static inline const char * eapol_sm_get_method_name(struct eapol_sm *sm)
438 {
439 	return NULL;
440 }
eapol_sm_set_ext_pw_ctx(struct eapol_sm * sm,struct ext_password_data * ext)441 static inline void eapol_sm_set_ext_pw_ctx(struct eapol_sm *sm,
442 					   struct ext_password_data *ext)
443 {
444 }
eapol_sm_failed(struct eapol_sm * sm)445 static inline int eapol_sm_failed(struct eapol_sm *sm)
446 {
447 	return 0;
448 }
eapol_sm_erp_flush(struct eapol_sm * sm)449 static inline void eapol_sm_erp_flush(struct eapol_sm *sm)
450 {
451 }
452 static inline struct wpabuf *
eapol_sm_build_erp_reauth_start(struct eapol_sm * sm)453 eapol_sm_build_erp_reauth_start(struct eapol_sm *sm)
454 {
455 	return NULL;
456 }
eapol_sm_process_erp_finish(struct eapol_sm * sm,const u8 * buf,size_t len)457 static inline void eapol_sm_process_erp_finish(struct eapol_sm *sm,
458 					       const u8 *buf, size_t len)
459 {
460 }
461 #endif /* IEEE8021X_EAPOL */
462 
463 #endif /* EAPOL_SUPP_SM_H */
464