Always send a configuration payload in IKEv1 TRANSACTIONs, even if it is empty
[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 * Received list of virtual IPs, host_t*
46 */
47 linked_list_t *vips;
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 this->vips->insert_last(this->vips, ip);
178 }
179 break;
180 }
181 default:
182 {
183 if (this->initiator)
184 {
185 handle_attribute(this, ca);
186 }
187 }
188 }
189 }
190
191 /**
192 * Scan for configuration payloads and attributes
193 */
194 static void process_payloads(private_mode_config_t *this, message_t *message)
195 {
196 enumerator_t *enumerator, *attributes;
197 payload_t *payload;
198
199 enumerator = message->create_payload_enumerator(message);
200 while (enumerator->enumerate(enumerator, &payload))
201 {
202 if (payload->get_type(payload) == CONFIGURATION_V1)
203 {
204 cp_payload_t *cp = (cp_payload_t*)payload;
205 configuration_attribute_t *ca;
206
207 switch (cp->get_type(cp))
208 {
209 case CFG_REQUEST:
210 this->identifier = cp->get_identifier(cp);
211 /* FALL */
212 case CFG_REPLY:
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 default:
223 DBG1(DBG_IKE, "ignoring %N config payload",
224 config_type_names, cp->get_type(cp));
225 break;
226 }
227 }
228 }
229 enumerator->destroy(enumerator);
230 }
231
232 METHOD(task_t, build_i, status_t,
233 private_mode_config_t *this, message_t *message)
234 {
235 cp_payload_t *cp;
236 enumerator_t *enumerator;
237 attribute_handler_t *handler;
238 peer_cfg_t *config;
239 configuration_attribute_type_t type;
240 chunk_t data;
241 linked_list_t *vips;
242 host_t *host;
243
244 cp = cp_payload_create_type(CONFIGURATION_V1, CFG_REQUEST);
245
246 vips = linked_list_create();
247
248 /* reuse virtual IP if we already have one */
249 enumerator = this->ike_sa->create_virtual_ip_enumerator(this->ike_sa, TRUE);
250 while (enumerator->enumerate(enumerator, &host))
251 {
252 vips->insert_last(vips, host);
253 }
254 enumerator->destroy(enumerator);
255
256 if (vips->get_count(vips) == 0)
257 {
258 config = this->ike_sa->get_peer_cfg(this->ike_sa);
259 enumerator = config->create_virtual_ip_enumerator(config);
260 while (enumerator->enumerate(enumerator, &host))
261 {
262 vips->insert_last(vips, host);
263 }
264 enumerator->destroy(enumerator);
265 }
266
267 if (vips->get_count(vips))
268 {
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 entry_t *entry;
283
284 DBG2(DBG_IKE, "building %N attribute",
285 configuration_attribute_type_names, type);
286 cp->add_attribute(cp,
287 configuration_attribute_create_chunk(CONFIGURATION_ATTRIBUTE_V1,
288 type, data));
289 INIT(entry,
290 .type = type,
291 .handler = handler,
292 );
293 this->requested->insert_last(this->requested, entry);
294 }
295 enumerator->destroy(enumerator);
296
297 vips->destroy(vips);
298
299 message->add_payload(message, (payload_t*)cp);
300
301 return NEED_MORE;
302 }
303
304 METHOD(task_t, process_r, status_t,
305 private_mode_config_t *this, message_t *message)
306 {
307 process_payloads(this, message);
308 return NEED_MORE;
309 }
310
311 METHOD(task_t, build_r, status_t,
312 private_mode_config_t *this, message_t *message)
313 {
314 enumerator_t *enumerator;
315 configuration_attribute_type_t type;
316 chunk_t value;
317 cp_payload_t *cp;
318 peer_cfg_t *config;
319 identification_t *id;
320 linked_list_t *vips, *pools;
321 host_t *requested;
322
323 cp = cp_payload_create_type(CONFIGURATION_V1, CFG_REPLY);
324
325 id = this->ike_sa->get_other_eap_id(this->ike_sa);
326 config = this->ike_sa->get_peer_cfg(this->ike_sa);
327 vips = linked_list_create();
328 pools = linked_list_create_from_enumerator(
329 config->create_pool_enumerator(config));
330
331 this->ike_sa->clear_virtual_ips(this->ike_sa, FALSE);
332
333 enumerator = this->vips->create_enumerator(this->vips);
334 while (enumerator->enumerate(enumerator, &requested))
335 {
336 host_t *found = NULL;
337
338 /* query all pools until we get an address */
339 DBG1(DBG_IKE, "peer requested virtual IP %H", requested);
340
341 found = hydra->attributes->acquire_address(hydra->attributes,
342 pools, id, requested);
343 if (found)
344 {
345 DBG1(DBG_IKE, "assigning virtual IP %H to peer '%Y'", found, id);
346 this->ike_sa->add_virtual_ip(this->ike_sa, FALSE, found);
347 cp->add_attribute(cp, build_vip(found));
348 vips->insert_last(vips, found);
349 }
350 else
351 {
352 DBG1(DBG_IKE, "no virtual IP found for %H requested by '%Y'",
353 requested, id);
354 }
355 }
356 enumerator->destroy(enumerator);
357
358 /* query registered providers for additional attributes to include */
359 enumerator = hydra->attributes->create_responder_enumerator(
360 hydra->attributes, pools, id, vips);
361 while (enumerator->enumerate(enumerator, &type, &value))
362 {
363 DBG2(DBG_IKE, "building %N attribute",
364 configuration_attribute_type_names, type);
365 cp->add_attribute(cp,
366 configuration_attribute_create_chunk(CONFIGURATION_ATTRIBUTE_V1,
367 type, value));
368 }
369 enumerator->destroy(enumerator);
370 vips->destroy_offset(vips, offsetof(host_t, destroy));
371 pools->destroy(pools);
372
373 cp->set_identifier(cp, this->identifier);
374 message->add_payload(message, (payload_t*)cp);
375
376 return SUCCESS;
377 }
378
379 METHOD(task_t, process_i, status_t,
380 private_mode_config_t *this, message_t *message)
381 {
382 enumerator_t *enumerator;
383 host_t *host;
384
385 process_payloads(this, message);
386
387 this->ike_sa->clear_virtual_ips(this->ike_sa, TRUE);
388
389 enumerator = this->vips->create_enumerator(this->vips);
390 while (enumerator->enumerate(enumerator, &host))
391 {
392 if (!host->is_anyaddr(host))
393 {
394 this->ike_sa->add_virtual_ip(this->ike_sa, TRUE, host);
395 }
396 }
397 enumerator->destroy(enumerator);
398
399 return SUCCESS;
400 }
401
402 METHOD(task_t, get_type, task_type_t,
403 private_mode_config_t *this)
404 {
405 return TASK_MODE_CONFIG;
406 }
407
408 METHOD(task_t, migrate, void,
409 private_mode_config_t *this, ike_sa_t *ike_sa)
410 {
411 this->ike_sa = ike_sa;
412 this->vips->destroy_offset(this->vips, offsetof(host_t, destroy));
413 this->vips = linked_list_create();
414 this->requested->destroy_function(this->requested, free);
415 this->requested = linked_list_create();
416 }
417
418 METHOD(task_t, destroy, void,
419 private_mode_config_t *this)
420 {
421 this->vips->destroy_offset(this->vips, offsetof(host_t, destroy));
422 this->requested->destroy_function(this->requested, free);
423 free(this);
424 }
425
426 /*
427 * Described in header.
428 */
429 mode_config_t *mode_config_create(ike_sa_t *ike_sa, bool initiator)
430 {
431 private_mode_config_t *this;
432
433 INIT(this,
434 .public = {
435 .task = {
436 .get_type = _get_type,
437 .migrate = _migrate,
438 .destroy = _destroy,
439 },
440 },
441 .initiator = initiator,
442 .ike_sa = ike_sa,
443 .requested = linked_list_create(),
444 .vips = linked_list_create(),
445 );
446
447 if (initiator)
448 {
449 this->public.task.build = _build_i;
450 this->public.task.process = _process_i;
451 }
452 else
453 {
454 this->public.task.build = _build_r;
455 this->public.task.process = _process_r;
456 }
457
458 return &this->public;
459 }