Pass all configured pool names to attribute provider enumerator
[strongswan.git] / src / libcharon / sa / ikev1 / tasks / mode_config.c
1 /*
2 * Copyright (C) 2011 Martin Willi
3 * Copyright (C) 2011 revosec AG
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 "mode_config.h"
17
18 #include <daemon.h>
19 #include <hydra.h>
20 #include <encoding/payloads/cp_payload.h>
21
22 typedef struct private_mode_config_t private_mode_config_t;
23
24 /**
25 * Private members of a mode_config_t task.
26 */
27 struct private_mode_config_t {
28
29 /**
30 * Public methods and task_t interface.
31 */
32 mode_config_t public;
33
34 /**
35 * Assigned IKE_SA.
36 */
37 ike_sa_t *ike_sa;
38
39 /**
40 * Are we the initiator?
41 */
42 bool initiator;
43
44 /**
45 * virtual ip
46 */
47 host_t *virtual_ip;
48
49 /**
50 * list of attributes requested and its handler, entry_t
51 */
52 linked_list_t *requested;
53
54 /**
55 * Identifier to include in response
56 */
57 u_int16_t identifier;
58 };
59
60 /**
61 * Entry for a requested attribute and the requesting handler
62 */
63 typedef struct {
64 /** attribute requested */
65 configuration_attribute_type_t type;
66 /** handler requesting this attribute */
67 attribute_handler_t *handler;
68 } entry_t;
69
70 /**
71 * build INTERNAL_IPV4/6_ADDRESS attribute from virtual ip
72 */
73 static configuration_attribute_t *build_vip(host_t *vip)
74 {
75 configuration_attribute_type_t type;
76 chunk_t chunk, prefix;
77
78 if (vip->get_family(vip) == AF_INET)
79 {
80 type = INTERNAL_IP4_ADDRESS;
81 if (vip->is_anyaddr(vip))
82 {
83 chunk = chunk_empty;
84 }
85 else
86 {
87 chunk = vip->get_address(vip);
88 }
89 }
90 else
91 {
92 type = INTERNAL_IP6_ADDRESS;
93 if (vip->is_anyaddr(vip))
94 {
95 chunk = chunk_empty;
96 }
97 else
98 {
99 prefix = chunk_alloca(1);
100 *prefix.ptr = 64;
101 chunk = vip->get_address(vip);
102 chunk = chunk_cata("cc", chunk, prefix);
103 }
104 }
105 return configuration_attribute_create_chunk(CONFIGURATION_ATTRIBUTE_V1,
106 type, chunk);
107 }
108
109 /**
110 * Handle a received attribute as initiator
111 */
112 static void handle_attribute(private_mode_config_t *this,
113 configuration_attribute_t *ca)
114 {
115 attribute_handler_t *handler = NULL;
116 enumerator_t *enumerator;
117 entry_t *entry;
118
119 /* find the handler which requested this attribute */
120 enumerator = this->requested->create_enumerator(this->requested);
121 while (enumerator->enumerate(enumerator, &entry))
122 {
123 if (entry->type == ca->get_type(ca))
124 {
125 handler = entry->handler;
126 this->requested->remove_at(this->requested, enumerator);
127 free(entry);
128 break;
129 }
130 }
131 enumerator->destroy(enumerator);
132
133 /* and pass it to the handle function */
134 handler = hydra->attributes->handle(hydra->attributes,
135 this->ike_sa->get_other_id(this->ike_sa), handler,
136 ca->get_type(ca), ca->get_chunk(ca));
137 if (handler)
138 {
139 this->ike_sa->add_configuration_attribute(this->ike_sa,
140 handler, ca->get_type(ca), ca->get_chunk(ca));
141 }
142 }
143
144 /**
145 * process a single configuration attribute
146 */
147 static void process_attribute(private_mode_config_t *this,
148 configuration_attribute_t *ca)
149 {
150 host_t *ip;
151 chunk_t addr;
152 int family = AF_INET6;
153
154 switch (ca->get_type(ca))
155 {
156 case INTERNAL_IP4_ADDRESS:
157 family = AF_INET;
158 /* fall */
159 case INTERNAL_IP6_ADDRESS:
160 {
161 addr = ca->get_chunk(ca);
162 if (addr.len == 0)
163 {
164 ip = host_create_any(family);
165 }
166 else
167 {
168 /* skip prefix byte in IPv6 payload*/
169 if (family == AF_INET6)
170 {
171 addr.len--;
172 }
173 ip = host_create_from_chunk(family, addr, 0);
174 }
175 if (ip)
176 {
177 DESTROY_IF(this->virtual_ip);
178 this->virtual_ip = ip;
179 }
180 break;
181 }
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_mode_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_V1)
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 this->identifier = cp->get_identifier(cp);
212 /* FALL */
213 case CFG_REPLY:
214 attributes = cp->create_attribute_enumerator(cp);
215 while (attributes->enumerate(attributes, &ca))
216 {
217 DBG2(DBG_IKE, "processing %N attribute",
218 configuration_attribute_type_names, ca->get_type(ca));
219 process_attribute(this, ca);
220 }
221 attributes->destroy(attributes);
222 break;
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_mode_config_t *this, message_t *message)
235 {
236 cp_payload_t *cp = NULL;
237 enumerator_t *enumerator;
238 attribute_handler_t *handler;
239 peer_cfg_t *config;
240 configuration_attribute_type_t type;
241 chunk_t data;
242 linked_list_t *vips;
243 host_t *host;
244
245 vips = linked_list_create();
246
247 /* reuse virtual IP if we already have one */
248 enumerator = this->ike_sa->create_virtual_ip_enumerator(this->ike_sa, TRUE);
249 while (enumerator->enumerate(enumerator, &host))
250 {
251 vips->insert_last(vips, host);
252 }
253 enumerator->destroy(enumerator);
254
255 if (vips->get_count(vips) == 0)
256 {
257 config = this->ike_sa->get_peer_cfg(this->ike_sa);
258 enumerator = config->create_virtual_ip_enumerator(config);
259 while (enumerator->enumerate(enumerator, &host))
260 {
261 vips->insert_last(vips, host);
262 }
263 enumerator->destroy(enumerator);
264 }
265
266 if (vips->get_count(vips))
267 {
268 cp = cp_payload_create_type(CONFIGURATION_V1, CFG_REQUEST);
269 enumerator = vips->create_enumerator(vips);
270 while (enumerator->enumerate(enumerator, &host))
271 {
272 cp->add_attribute(cp, build_vip(host));
273 }
274 enumerator->destroy(enumerator);
275 }
276
277 enumerator = hydra->attributes->create_initiator_enumerator(
278 hydra->attributes,
279 this->ike_sa->get_other_id(this->ike_sa), vips);
280 while (enumerator->enumerate(enumerator, &handler, &type, &data))
281 {
282 configuration_attribute_t *ca;
283 entry_t *entry;
284
285 DBG2(DBG_IKE, "building %N attribute",
286 configuration_attribute_type_names, type);
287 ca = configuration_attribute_create_chunk(CONFIGURATION_ATTRIBUTE_V1,
288 type, data);
289 if (!cp)
290 {
291 cp = cp_payload_create_type(CONFIGURATION_V1, CFG_REQUEST);
292 }
293 cp->add_attribute(cp, ca);
294
295 INIT(entry,
296 .type = type,
297 .handler = handler,
298 );
299 this->requested->insert_last(this->requested, entry);
300 }
301 enumerator->destroy(enumerator);
302
303 vips->destroy(vips);
304
305 if (cp)
306 {
307 message->add_payload(message, (payload_t*)cp);
308 }
309 return NEED_MORE;
310 }
311
312 METHOD(task_t, process_r, status_t,
313 private_mode_config_t *this, message_t *message)
314 {
315 process_payloads(this, message);
316 return NEED_MORE;
317 }
318
319 METHOD(task_t, build_r, status_t,
320 private_mode_config_t *this, message_t *message)
321 {
322 enumerator_t *enumerator;
323 configuration_attribute_type_t type;
324 chunk_t value;
325 host_t *vip = NULL;
326 cp_payload_t *cp = NULL;
327 peer_cfg_t *config;
328 identification_t *id;
329 linked_list_t *vips, *pools;
330 char *pool;
331
332 id = this->ike_sa->get_other_eap_id(this->ike_sa);
333
334 config = this->ike_sa->get_peer_cfg(this->ike_sa);
335 enumerator = config->create_pool_enumerator(config);
336 if (!enumerator->enumerate(enumerator, &pool))
337 { /* TODO: currently we query the first pool, only */
338 pool = NULL;
339 }
340 enumerator->destroy(enumerator);
341 if (this->virtual_ip)
342 {
343 DBG1(DBG_IKE, "peer requested virtual IP %H", this->virtual_ip);
344 if (pool)
345 {
346 vip = hydra->attributes->acquire_address(hydra->attributes,
347 pool, id, this->virtual_ip);
348 }
349 cp = cp_payload_create_type(CONFIGURATION_V1, CFG_REPLY);
350 if (vip)
351 {
352 DBG1(DBG_IKE, "assigning virtual IP %H to peer '%Y'", vip, id);
353 this->ike_sa->add_virtual_ip(this->ike_sa, FALSE, vip);
354 cp->add_attribute(cp, build_vip(vip));
355 }
356 else
357 {
358 DBG1(DBG_IKE, "no virtual IP found, sending empty config payload");
359 }
360 }
361 /* query registered providers for additional attributes to include */
362 vips = linked_list_create();
363 /* TODO: use list with all assigned VIPs */
364 if (vip)
365 {
366 vips->insert_last(vips, vip);
367 }
368 pools = linked_list_create();
369 /* TODO: use list of all pools */
370 if (pool)
371 {
372 pools->insert_last(pools, pool);
373 }
374 enumerator = hydra->attributes->create_responder_enumerator(
375 hydra->attributes, pools, id, vips);
376 while (enumerator->enumerate(enumerator, &type, &value))
377 {
378 if (!cp)
379 {
380 cp = cp_payload_create_type(CONFIGURATION_V1, CFG_REPLY);
381 }
382 DBG2(DBG_IKE, "building %N attribute",
383 configuration_attribute_type_names, type);
384 cp->add_attribute(cp,
385 configuration_attribute_create_chunk(CONFIGURATION_ATTRIBUTE_V1,
386 type, value));
387 }
388 enumerator->destroy(enumerator);
389 vips->destroy(vips);
390 pools->destroy(pools);
391
392 if (cp)
393 {
394 cp->set_identifier(cp, this->identifier);
395 message->add_payload(message, (payload_t*)cp);
396 }
397 DESTROY_IF(vip);
398 return SUCCESS;
399 }
400
401 METHOD(task_t, process_i, status_t,
402 private_mode_config_t *this, message_t *message)
403 {
404 process_payloads(this, message);
405
406 if (this->virtual_ip)
407 {
408 this->ike_sa->add_virtual_ip(this->ike_sa, TRUE, this->virtual_ip);
409 }
410 return SUCCESS;
411 }
412
413 METHOD(task_t, get_type, task_type_t,
414 private_mode_config_t *this)
415 {
416 return TASK_MODE_CONFIG;
417 }
418
419 METHOD(task_t, migrate, void,
420 private_mode_config_t *this, ike_sa_t *ike_sa)
421 {
422 DESTROY_IF(this->virtual_ip);
423
424 this->ike_sa = ike_sa;
425 this->virtual_ip = NULL;
426 this->requested->destroy_function(this->requested, free);
427 this->requested = linked_list_create();
428 }
429
430 METHOD(task_t, destroy, void,
431 private_mode_config_t *this)
432 {
433 DESTROY_IF(this->virtual_ip);
434 this->requested->destroy_function(this->requested, free);
435 free(this);
436 }
437
438 /*
439 * Described in header.
440 */
441 mode_config_t *mode_config_create(ike_sa_t *ike_sa, bool initiator)
442 {
443 private_mode_config_t *this;
444
445 INIT(this,
446 .public = {
447 .task = {
448 .get_type = _get_type,
449 .migrate = _migrate,
450 .destroy = _destroy,
451 },
452 },
453 .initiator = initiator,
454 .ike_sa = ike_sa,
455 .requested = linked_list_create(),
456 );
457
458 if (initiator)
459 {
460 this->public.task.build = _build_i;
461 this->public.task.process = _process_i;
462 }
463 else
464 {
465 this->public.task.build = _build_r;
466 this->public.task.process = _process_r;
467 }
468
469 return &this->public;
470 }