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1.1 misho 1: /*
2: * Copyright (C) 2012 Tobias Brunner
3: * HSR Hochschule fuer Technik Rapperswil
4: *
5: * This program is free software; you can redistribute it and/or modify it
6: * under the terms of the GNU General Public License as published by the
7: * Free Software Foundation; either version 2 of the License, or (at your
8: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
9: *
10: * This program is distributed in the hope that it will be useful, but
11: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13: * for more details.
14: */
15:
16: #include "eap_dynamic.h"
17:
18: #include <daemon.h>
19: #include <library.h>
20:
21: typedef struct private_eap_dynamic_t private_eap_dynamic_t;
22:
23: /**
24: * Private data of an eap_dynamic_t object.
25: */
26: struct private_eap_dynamic_t {
27:
28: /**
29: * Public authenticator_t interface.
30: */
31: eap_dynamic_t public;
32:
33: /**
34: * ID of the server
35: */
36: identification_t *server;
37:
38: /**
39: * ID of the peer
40: */
41: identification_t *peer;
42:
43: /**
44: * Our supported EAP types (as eap_vendor_type_t*)
45: */
46: linked_list_t *types;
47:
48: /**
49: * EAP types supported by peer, if any
50: */
51: linked_list_t *other_types;
52:
53: /**
54: * Prefer types sent by peer
55: */
56: bool prefer_peer;
57:
58: /**
59: * The proxied EAP method
60: */
61: eap_method_t *method;
62: };
63:
64: /**
65: * Compare two eap_vendor_type_t objects
66: */
67: static bool entry_matches(eap_vendor_type_t *item, eap_vendor_type_t *other)
68: {
69: return item->type == other->type && item->vendor == other->vendor;
70: }
71:
72: CALLBACK(entry_matches_cb, bool,
73: eap_vendor_type_t *item, va_list args)
74: {
75: eap_vendor_type_t *other;
76:
77: VA_ARGS_VGET(args, other);
78: return entry_matches(item, other);
79: }
80:
81: /**
82: * Load the given EAP method
83: */
84: static eap_method_t *load_method(private_eap_dynamic_t *this,
85: eap_type_t type, uint32_t vendor)
86: {
87: eap_method_t *method;
88:
89: method = charon->eap->create_instance(charon->eap, type, vendor, EAP_SERVER,
90: this->server, this->peer);
91: if (!method)
92: {
93: if (vendor)
94: {
95: DBG1(DBG_IKE, "loading vendor specific EAP method %d-%d failed",
96: type, vendor);
97: }
98: else
99: {
100: DBG1(DBG_IKE, "loading %N method failed", eap_type_names, type);
101: }
102: }
103: return method;
104: }
105:
106: METHOD(eap_method_t, get_auth, auth_cfg_t*,
107: private_eap_dynamic_t *this)
108: {
109: /* get_auth() is only registered if the EAP method supports it */
110: return this->method->get_auth(this->method);
111: }
112:
113: /**
114: * Select the first method we can instantiate and is supported by both peers.
115: */
116: static void select_method(private_eap_dynamic_t *this)
117: {
118: eap_vendor_type_t *entry;
119: linked_list_t *outer = this->types, *inner = this->other_types;
120: char *who = "peer";
121:
122: if (this->other_types && this->prefer_peer)
123: {
124: outer = this->other_types;
125: inner = this->types;
126: who = "us";
127: }
128:
129: while (outer->remove_first(outer, (void*)&entry) == SUCCESS)
130: {
131: if (inner)
132: {
133: if (!inner->find_first(inner, entry_matches_cb, NULL, entry))
134: {
135: if (entry->vendor)
136: {
137: DBG2(DBG_IKE, "proposed vendor specific EAP method %d-%d "
138: "not supported by %s, skipped", entry->type,
139: entry->vendor, who);
140: }
141: else
142: {
143: DBG2(DBG_IKE, "proposed %N method not supported by %s, "
144: "skipped", eap_type_names, entry->type, who);
145: }
146: free(entry);
147: continue;
148: }
149: }
150: this->method = load_method(this, entry->type, entry->vendor);
151: if (this->method)
152: {
153: if (this->method->get_auth)
154: {
155: this->public.interface.get_auth = _get_auth;
156: }
157: if (entry->vendor)
158: {
159: DBG1(DBG_IKE, "vendor specific EAP method %d-%d selected",
160: entry->type, entry->vendor);
161: }
162: else
163: {
164: DBG1(DBG_IKE, "%N method selected", eap_type_names,
165: entry->type);
166: }
167: free(entry);
168: break;
169: }
170: free(entry);
171: }
172: }
173:
174: METHOD(eap_method_t, initiate, status_t,
175: private_eap_dynamic_t *this, eap_payload_t **out)
176: {
177: if (!this->method)
178: {
179: select_method(this);
180: if (!this->method)
181: {
182: DBG1(DBG_IKE, "no supported EAP method found");
183: return FAILED;
184: }
185: }
186: return this->method->initiate(this->method, out);
187: }
188:
189: METHOD(eap_method_t, process, status_t,
190: private_eap_dynamic_t *this, eap_payload_t *in, eap_payload_t **out)
191: {
192: eap_type_t received_type, type;
193: uint32_t received_vendor, vendor;
194:
195: received_type = in->get_type(in, &received_vendor);
196: if (received_vendor == 0 && received_type == EAP_NAK)
197: {
198: enumerator_t *enumerator;
199:
200: DBG1(DBG_IKE, "received %N, selecting a different EAP method",
201: eap_type_names, EAP_NAK);
202:
203: if (this->other_types)
204: { /* we already received a Nak or a proper response before */
205: DBG1(DBG_IKE, "%N is not supported in this state", eap_type_names,
206: EAP_NAK);
207: return FAILED;
208: }
209:
210: this->other_types = linked_list_create();
211: enumerator = in->get_types(in);
212: while (enumerator->enumerate(enumerator, &type, &vendor))
213: {
214: eap_vendor_type_t *entry;
215:
216: if (!type)
217: {
218: DBG1(DBG_IKE, "peer does not support any other EAP methods");
219: enumerator->destroy(enumerator);
220: return FAILED;
221: }
222: INIT(entry,
223: .type = type,
224: .vendor = vendor,
225: );
226: this->other_types->insert_last(this->other_types, entry);
227: }
228: enumerator->destroy(enumerator);
229:
230: /* restart with a different method */
231: this->method->destroy(this->method);
232: this->method = NULL;
233: this->public.interface.get_auth = NULL;
234: return initiate(this, out);
235: }
236: if (!this->other_types)
237: { /* so we don't handle EAP-Naks later */
238: this->other_types = linked_list_create();
239: }
240: if (this->method)
241: {
242: return this->method->process(this->method, in, out);
243: }
244: return FAILED;
245: }
246:
247: METHOD(eap_method_t, get_type, eap_type_t,
248: private_eap_dynamic_t *this, uint32_t *vendor)
249: {
250: if (this->method)
251: {
252: return this->method->get_type(this->method, vendor);
253: }
254: *vendor = 0;
255: return EAP_DYNAMIC;
256: }
257:
258: METHOD(eap_method_t, get_msk, status_t,
259: private_eap_dynamic_t *this, chunk_t *msk)
260: {
261: if (this->method)
262: {
263: return this->method->get_msk(this->method, msk);
264: }
265: return FAILED;
266: }
267:
268: METHOD(eap_method_t, get_identifier, uint8_t,
269: private_eap_dynamic_t *this)
270: {
271: if (this->method)
272: {
273: return this->method->get_identifier(this->method);
274: }
275: return 0;
276: }
277:
278: METHOD(eap_method_t, set_identifier, void,
279: private_eap_dynamic_t *this, uint8_t identifier)
280: {
281: if (this->method)
282: {
283: this->method->set_identifier(this->method, identifier);
284: }
285: }
286:
287: METHOD(eap_method_t, is_mutual, bool,
288: private_eap_dynamic_t *this)
289: {
290: if (this->method)
291: {
292: return this->method->is_mutual(this->method);
293: }
294: return FALSE;
295: }
296:
297: METHOD(eap_method_t, destroy, void,
298: private_eap_dynamic_t *this)
299: {
300: DESTROY_IF(this->method);
301: this->types->destroy_function(this->types, (void*)free);
302: DESTROY_FUNCTION_IF(this->other_types, (void*)free);
303: this->server->destroy(this->server);
304: this->peer->destroy(this->peer);
305: free(this);
306: }
307:
308: /**
309: * Parse preferred EAP types
310: */
311: static void handle_preferred_eap_types(private_eap_dynamic_t *this,
312: char *methods)
313: {
314: enumerator_t *enumerator;
315: eap_vendor_type_t *type, *entry;
316: linked_list_t *preferred;
317: char *method;
318:
319: /* parse preferred EAP methods, format: type[-vendor], ... */
320: preferred = linked_list_create();
321: enumerator = enumerator_create_token(methods, ",", " ");
322: while (enumerator->enumerate(enumerator, &method))
323: {
324: type = eap_vendor_type_from_string(method);
325: if (type)
326: {
327: preferred->insert_last(preferred, type);
328: }
329: }
330: enumerator->destroy(enumerator);
331:
332: enumerator = this->types->create_enumerator(this->types);
333: while (preferred->remove_last(preferred, (void**)&type) == SUCCESS)
334: { /* move (supported) types to the front, maintain the preferred order */
335: this->types->reset_enumerator(this->types, enumerator);
336: while (enumerator->enumerate(enumerator, &entry))
337: {
338: if (entry_matches(entry, type))
339: {
340: this->types->remove_at(this->types, enumerator);
341: this->types->insert_first(this->types, entry);
342: break;
343: }
344: }
345: free(type);
346: }
347: enumerator->destroy(enumerator);
348: preferred->destroy(preferred);
349: }
350:
351: /**
352: * Get all supported EAP methods
353: */
354: static void get_supported_eap_types(private_eap_dynamic_t *this)
355: {
356: enumerator_t *enumerator;
357: eap_type_t type;
358: uint32_t vendor;
359:
360: enumerator = charon->eap->create_enumerator(charon->eap, EAP_SERVER);
361: while (enumerator->enumerate(enumerator, &type, &vendor))
362: {
363: eap_vendor_type_t *entry;
364:
365: INIT(entry,
366: .type = type,
367: .vendor = vendor,
368: );
369: this->types->insert_last(this->types, entry);
370: }
371: enumerator->destroy(enumerator);
372: }
373:
374: /*
375: * Defined in header
376: */
377: eap_dynamic_t *eap_dynamic_create(identification_t *server,
378: identification_t *peer)
379: {
380: private_eap_dynamic_t *this;
381: char *preferred;
382:
383: INIT(this,
384: .public = {
385: .interface = {
386: .initiate = _initiate,
387: .process = _process,
388: .get_type = _get_type,
389: .is_mutual = _is_mutual,
390: .get_msk = _get_msk,
391: .get_identifier = _get_identifier,
392: .set_identifier = _set_identifier,
393: .destroy = _destroy,
394: },
395: },
396: .peer = peer->clone(peer),
397: .server = server->clone(server),
398: .types = linked_list_create(),
399: .prefer_peer = lib->settings->get_bool(lib->settings,
400: "%s.plugins.eap-dynamic.prefer_peer", FALSE, lib->ns),
401: );
402:
403: /* get all supported EAP methods */
404: get_supported_eap_types(this);
405: /* move preferred methods to the front */
406: preferred = lib->settings->get_str(lib->settings,
407: "%s.plugins.eap-dynamic.preferred", NULL, lib->ns);
408: if (preferred)
409: {
410: handle_preferred_eap_types(this, preferred);
411: }
412: return &this->public;
413: }