Migrated ike_config to INIT/METHOD macros
[strongswan.git] / src / libcharon / sa / tasks / ike_config.c
1 /*
2 * Copyright (C) 2007 Martin Willi
3 * Copyright (C) 2006-2007 Fabian Hartmann, Noah Heusser
4 * Hochschule fuer Technik Rapperswil
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * for more details.
15 */
16
17 #include "ike_config.h"
18
19 #include <daemon.h>
20 #include <hydra.h>
21 #include <encoding/payloads/cp_payload.h>
22
23 typedef struct private_ike_config_t private_ike_config_t;
24
25 /**
26 * Private members of a ike_config_t task.
27 */
28 struct private_ike_config_t {
29
30 /**
31 * Public methods and task_t interface.
32 */
33 ike_config_t public;
34
35 /**
36 * Assigned IKE_SA.
37 */
38 ike_sa_t *ike_sa;
39
40 /**
41 * Are we the initiator?
42 */
43 bool initiator;
44
45 /**
46 * virtual ip
47 */
48 host_t *virtual_ip;
49
50 /**
51 * list of attributes requested and its handler, entry_t
52 */
53 linked_list_t *requested;
54 };
55
56 /**
57 * Entry for a requested attribute and the requesting handler
58 */
59 typedef struct {
60 /** attribute requested */
61 configuration_attribute_type_t type;
62 /** handler requesting this attribute */
63 attribute_handler_t *handler;
64 } entry_t;
65
66 /**
67 * build INTERNAL_IPV4/6_ADDRESS attribute from virtual ip
68 */
69 static configuration_attribute_t *build_vip(host_t *vip)
70 {
71 configuration_attribute_type_t type;
72 chunk_t chunk, prefix;
73
74 if (vip->get_family(vip) == AF_INET)
75 {
76 type = INTERNAL_IP4_ADDRESS;
77 if (vip->is_anyaddr(vip))
78 {
79 chunk = chunk_empty;
80 }
81 else
82 {
83 chunk = vip->get_address(vip);
84 }
85 }
86 else
87 {
88 type = INTERNAL_IP6_ADDRESS;
89 if (vip->is_anyaddr(vip))
90 {
91 chunk = chunk_empty;
92 }
93 else
94 {
95 prefix = chunk_alloca(1);
96 *prefix.ptr = 64;
97 chunk = vip->get_address(vip);
98 chunk = chunk_cata("cc", chunk, prefix);
99 }
100 }
101 return configuration_attribute_create_value(type, chunk);
102 }
103
104 /**
105 * Handle a received attribute as initiator
106 */
107 static void handle_attribute(private_ike_config_t *this,
108 configuration_attribute_t *ca)
109 {
110 attribute_handler_t *handler = NULL;
111 enumerator_t *enumerator;
112 entry_t *entry;
113
114 /* find the handler which requested this attribute */
115 enumerator = this->requested->create_enumerator(this->requested);
116 while (enumerator->enumerate(enumerator, &entry))
117 {
118 if (entry->type == ca->get_type(ca))
119 {
120 handler = entry->handler;
121 this->requested->remove_at(this->requested, enumerator);
122 free(entry);
123 break;
124 }
125 }
126 enumerator->destroy(enumerator);
127
128 /* and pass it to the handle function */
129 handler = hydra->attributes->handle(hydra->attributes,
130 this->ike_sa->get_other_id(this->ike_sa), handler,
131 ca->get_type(ca), ca->get_value(ca));
132 if (handler)
133 {
134 this->ike_sa->add_configuration_attribute(this->ike_sa,
135 handler, ca->get_type(ca), ca->get_value(ca));
136 }
137 }
138
139 /**
140 * process a single configuration attribute
141 */
142 static void process_attribute(private_ike_config_t *this,
143 configuration_attribute_t *ca)
144 {
145 host_t *ip;
146 chunk_t addr;
147 int family = AF_INET6;
148
149 switch (ca->get_type(ca))
150 {
151 case INTERNAL_IP4_ADDRESS:
152 family = AF_INET;
153 /* fall */
154 case INTERNAL_IP6_ADDRESS:
155 {
156 addr = ca->get_value(ca);
157 if (addr.len == 0)
158 {
159 ip = host_create_any(family);
160 }
161 else
162 {
163 /* skip prefix byte in IPv6 payload*/
164 if (family == AF_INET6)
165 {
166 addr.len--;
167 }
168 ip = host_create_from_chunk(family, addr, 0);
169 }
170 if (ip)
171 {
172 DESTROY_IF(this->virtual_ip);
173 this->virtual_ip = ip;
174 }
175 break;
176 }
177 case INTERNAL_IP4_SERVER:
178 case INTERNAL_IP6_SERVER:
179 /* assume it's a Windows client if we see proprietary attributes */
180 this->ike_sa->enable_extension(this->ike_sa, EXT_MS_WINDOWS);
181 /* fall */
182 default:
183 {
184 if (this->initiator)
185 {
186 handle_attribute(this, ca);
187 }
188 }
189 }
190 }
191
192 /**
193 * Scan for configuration payloads and attributes
194 */
195 static void process_payloads(private_ike_config_t *this, message_t *message)
196 {
197 enumerator_t *enumerator, *attributes;
198 payload_t *payload;
199
200 enumerator = message->create_payload_enumerator(message);
201 while (enumerator->enumerate(enumerator, &payload))
202 {
203 if (payload->get_type(payload) == CONFIGURATION)
204 {
205 cp_payload_t *cp = (cp_payload_t*)payload;
206 configuration_attribute_t *ca;
207
208 switch (cp->get_type(cp))
209 {
210 case CFG_REQUEST:
211 case CFG_REPLY:
212 {
213 attributes = cp->create_attribute_enumerator(cp);
214 while (attributes->enumerate(attributes, &ca))
215 {
216 DBG2(DBG_IKE, "processing %N attribute",
217 configuration_attribute_type_names, ca->get_type(ca));
218 process_attribute(this, ca);
219 }
220 attributes->destroy(attributes);
221 break;
222 }
223 default:
224 DBG1(DBG_IKE, "ignoring %N config payload",
225 config_type_names, cp->get_type(cp));
226 break;
227 }
228 }
229 }
230 enumerator->destroy(enumerator);
231 }
232
233 METHOD(task_t, build_i, status_t,
234 private_ike_config_t *this, message_t *message)
235 {
236 if (message->get_message_id(message) == 1)
237 { /* in first IKE_AUTH only */
238 cp_payload_t *cp = NULL;
239 enumerator_t *enumerator;
240 attribute_handler_t *handler;
241 peer_cfg_t *config;
242 configuration_attribute_type_t type;
243 chunk_t data;
244 host_t *vip;
245
246 /* reuse virtual IP if we already have one */
247 vip = this->ike_sa->get_virtual_ip(this->ike_sa, TRUE);
248 if (!vip)
249 {
250 config = this->ike_sa->get_peer_cfg(this->ike_sa);
251 vip = config->get_virtual_ip(config);
252 }
253 if (vip)
254 {
255 cp = cp_payload_create_type(CFG_REQUEST);
256 cp->add_attribute(cp, build_vip(vip));
257 }
258
259 enumerator = hydra->attributes->create_initiator_enumerator(hydra->attributes,
260 this->ike_sa->get_other_id(this->ike_sa), vip);
261 while (enumerator->enumerate(enumerator, &handler, &type, &data))
262 {
263 configuration_attribute_t *ca;
264 entry_t *entry;
265
266 /* create configuration attribute */
267 DBG2(DBG_IKE, "building %N attribute",
268 configuration_attribute_type_names, type);
269 ca = configuration_attribute_create_value(type, data);
270 if (!cp)
271 {
272 cp = cp_payload_create_type(CFG_REQUEST);
273 }
274 cp->add_attribute(cp, ca);
275
276 /* save handler along with requested type */
277 entry = malloc_thing(entry_t);
278 entry->type = type;
279 entry->handler = handler;
280
281 this->requested->insert_last(this->requested, entry);
282 }
283 enumerator->destroy(enumerator);
284
285 if (cp)
286 {
287 message->add_payload(message, (payload_t*)cp);
288 }
289 }
290 return NEED_MORE;
291 }
292
293 METHOD(task_t, process_r, status_t,
294 private_ike_config_t *this, message_t *message)
295 {
296 if (message->get_message_id(message) == 1)
297 { /* in first IKE_AUTH only */
298 process_payloads(this, message);
299 }
300 return NEED_MORE;
301 }
302
303 METHOD(task_t, build_r, status_t,
304 private_ike_config_t *this, message_t *message)
305 {
306 if (this->ike_sa->get_state(this->ike_sa) == IKE_ESTABLISHED)
307 { /* in last IKE_AUTH exchange */
308 enumerator_t *enumerator;
309 configuration_attribute_type_t type;
310 chunk_t value;
311 host_t *vip = NULL;
312 cp_payload_t *cp = NULL;
313 peer_cfg_t *config;
314 identification_t *id;
315
316 id = this->ike_sa->get_other_eap_id(this->ike_sa);
317
318 config = this->ike_sa->get_peer_cfg(this->ike_sa);
319 if (this->virtual_ip)
320 {
321 DBG1(DBG_IKE, "peer requested virtual IP %H", this->virtual_ip);
322 if (config->get_pool(config))
323 {
324 vip = hydra->attributes->acquire_address(hydra->attributes,
325 config->get_pool(config), id, this->virtual_ip);
326 }
327 if (vip == NULL)
328 {
329 DBG1(DBG_IKE, "no virtual IP found, sending %N",
330 notify_type_names, INTERNAL_ADDRESS_FAILURE);
331 message->add_notify(message, FALSE, INTERNAL_ADDRESS_FAILURE,
332 chunk_empty);
333 return SUCCESS;
334 }
335 DBG1(DBG_IKE, "assigning virtual IP %H to peer '%Y'", vip, id);
336 this->ike_sa->set_virtual_ip(this->ike_sa, FALSE, vip);
337
338 cp = cp_payload_create_type(CFG_REPLY);
339 cp->add_attribute(cp, build_vip(vip));
340 }
341
342 /* query registered providers for additional attributes to include */
343 enumerator = hydra->attributes->create_responder_enumerator(
344 hydra->attributes, config->get_pool(config), id, vip);
345 while (enumerator->enumerate(enumerator, &type, &value))
346 {
347 if (!cp)
348 {
349 cp = cp_payload_create_type(CFG_REPLY);
350 }
351 DBG2(DBG_IKE, "building %N attribute",
352 configuration_attribute_type_names, type);
353 cp->add_attribute(cp,
354 configuration_attribute_create_value(type, value));
355 }
356 enumerator->destroy(enumerator);
357
358 if (cp)
359 {
360 message->add_payload(message, (payload_t*)cp);
361 }
362 DESTROY_IF(vip);
363 return SUCCESS;
364 }
365 return NEED_MORE;
366 }
367
368 METHOD(task_t, process_i, status_t,
369 private_ike_config_t *this, message_t *message)
370 {
371 if (this->ike_sa->get_state(this->ike_sa) == IKE_ESTABLISHED)
372 { /* in last IKE_AUTH exchange */
373
374 process_payloads(this, message);
375
376 if (this->virtual_ip)
377 {
378 this->ike_sa->set_virtual_ip(this->ike_sa, TRUE, this->virtual_ip);
379 }
380 return SUCCESS;
381 }
382 return NEED_MORE;
383 }
384
385 METHOD(task_t, get_type, task_type_t,
386 private_ike_config_t *this)
387 {
388 return IKE_CONFIG;
389 }
390
391 METHOD(task_t, migrate, void,
392 private_ike_config_t *this, ike_sa_t *ike_sa)
393 {
394 DESTROY_IF(this->virtual_ip);
395
396 this->ike_sa = ike_sa;
397 this->virtual_ip = NULL;
398 this->requested->destroy_function(this->requested, free);
399 this->requested = linked_list_create();
400 }
401
402 METHOD(task_t, destroy, void,
403 private_ike_config_t *this)
404 {
405 DESTROY_IF(this->virtual_ip);
406 this->requested->destroy_function(this->requested, free);
407 free(this);
408 }
409
410 /*
411 * Described in header.
412 */
413 ike_config_t *ike_config_create(ike_sa_t *ike_sa, bool initiator)
414 {
415 private_ike_config_t *this;
416
417 INIT(this,
418 .public = {
419 .task = {
420 .get_type = _get_type,
421 .migrate = _migrate,
422 .destroy = _destroy,
423 },
424 },
425 .initiator = initiator,
426 .ike_sa = ike_sa,
427 .requested = linked_list_create(),
428 );
429
430 if (initiator)
431 {
432 this->public.task.build = _build_i;
433 this->public.task.process = _process_i;
434 }
435 else
436 {
437 this->public.task.build = _build_r;
438 this->public.task.process = _process_r;
439 }
440
441 return &this->public;
442 }
443