ab3a81386d03db2d66a7b684b16e5aa299dce2ee
[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 host_t *vip;
243
244 /* reuse virtual IP if we already have one */
245 vip = this->ike_sa->get_virtual_ip(this->ike_sa, TRUE);
246 if (!vip)
247 {
248 config = this->ike_sa->get_peer_cfg(this->ike_sa);
249 vip = config->get_virtual_ip(config);
250 }
251 if (vip)
252 {
253 cp = cp_payload_create_type(CONFIGURATION_V1, CFG_REQUEST);
254 cp->add_attribute(cp, build_vip(vip));
255 }
256
257 enumerator = hydra->attributes->create_initiator_enumerator(hydra->attributes,
258 this->ike_sa->get_other_id(this->ike_sa), vip);
259 while (enumerator->enumerate(enumerator, &handler, &type, &data))
260 {
261 configuration_attribute_t *ca;
262 entry_t *entry;
263
264 DBG2(DBG_IKE, "building %N attribute",
265 configuration_attribute_type_names, type);
266 ca = configuration_attribute_create_chunk(CONFIGURATION_ATTRIBUTE_V1,
267 type, data);
268 if (!cp)
269 {
270 cp = cp_payload_create_type(CONFIGURATION_V1, CFG_REQUEST);
271 }
272 cp->add_attribute(cp, ca);
273
274 INIT(entry,
275 .type = type,
276 .handler = handler,
277 );
278 this->requested->insert_last(this->requested, entry);
279 }
280 enumerator->destroy(enumerator);
281
282 if (cp)
283 {
284 message->add_payload(message, (payload_t*)cp);
285 }
286 return NEED_MORE;
287 }
288
289 METHOD(task_t, process_r, status_t,
290 private_mode_config_t *this, message_t *message)
291 {
292 process_payloads(this, message);
293 return NEED_MORE;
294 }
295
296 METHOD(task_t, build_r, status_t,
297 private_mode_config_t *this, message_t *message)
298 {
299 enumerator_t *enumerator;
300 configuration_attribute_type_t type;
301 chunk_t value;
302 host_t *vip = NULL;
303 cp_payload_t *cp = NULL;
304 peer_cfg_t *config;
305 identification_t *id;
306
307 id = this->ike_sa->get_other_eap_id(this->ike_sa);
308
309 config = this->ike_sa->get_peer_cfg(this->ike_sa);
310 if (this->virtual_ip)
311 {
312 DBG1(DBG_IKE, "peer requested virtual IP %H", this->virtual_ip);
313 if (config->get_pool(config))
314 {
315 vip = hydra->attributes->acquire_address(hydra->attributes,
316 config->get_pool(config), id, this->virtual_ip);
317 }
318 cp = cp_payload_create_type(CONFIGURATION_V1, CFG_REPLY);
319 if (vip)
320 {
321 DBG1(DBG_IKE, "assigning virtual IP %H to peer '%Y'", vip, id);
322 this->ike_sa->set_virtual_ip(this->ike_sa, FALSE, vip);
323 cp->add_attribute(cp, build_vip(vip));
324 }
325 else
326 {
327 DBG1(DBG_IKE, "no virtual IP found, sending empty config payload");
328 }
329 }
330 /* query registered providers for additional attributes to include */
331 enumerator = hydra->attributes->create_responder_enumerator(
332 hydra->attributes, config->get_pool(config), id, vip);
333 while (enumerator->enumerate(enumerator, &type, &value))
334 {
335 if (!cp)
336 {
337 cp = cp_payload_create_type(CONFIGURATION_V1, CFG_REPLY);
338 }
339 DBG2(DBG_IKE, "building %N attribute",
340 configuration_attribute_type_names, type);
341 cp->add_attribute(cp,
342 configuration_attribute_create_chunk(CONFIGURATION_ATTRIBUTE_V1,
343 type, value));
344 }
345 enumerator->destroy(enumerator);
346
347 if (cp)
348 {
349 cp->set_identifier(cp, this->identifier);
350 message->add_payload(message, (payload_t*)cp);
351 }
352 DESTROY_IF(vip);
353 return SUCCESS;
354 }
355
356 METHOD(task_t, process_i, status_t,
357 private_mode_config_t *this, message_t *message)
358 {
359 process_payloads(this, message);
360
361 if (this->virtual_ip)
362 {
363 this->ike_sa->set_virtual_ip(this->ike_sa, TRUE, this->virtual_ip);
364 }
365 return SUCCESS;
366 }
367
368 METHOD(task_t, get_type, task_type_t,
369 private_mode_config_t *this)
370 {
371 return TASK_MODE_CONFIG;
372 }
373
374 METHOD(task_t, migrate, void,
375 private_mode_config_t *this, ike_sa_t *ike_sa)
376 {
377 DESTROY_IF(this->virtual_ip);
378
379 this->ike_sa = ike_sa;
380 this->virtual_ip = NULL;
381 this->requested->destroy_function(this->requested, free);
382 this->requested = linked_list_create();
383 }
384
385 METHOD(task_t, destroy, void,
386 private_mode_config_t *this)
387 {
388 DESTROY_IF(this->virtual_ip);
389 this->requested->destroy_function(this->requested, free);
390 free(this);
391 }
392
393 /*
394 * Described in header.
395 */
396 mode_config_t *mode_config_create(ike_sa_t *ike_sa, bool initiator)
397 {
398 private_mode_config_t *this;
399
400 INIT(this,
401 .public = {
402 .task = {
403 .get_type = _get_type,
404 .migrate = _migrate,
405 .destroy = _destroy,
406 },
407 },
408 .initiator = initiator,
409 .ike_sa = ike_sa,
410 .requested = linked_list_create(),
411 );
412
413 if (initiator)
414 {
415 this->public.task.build = _build_i;
416 this->public.task.process = _process_i;
417 }
418 else
419 {
420 this->public.task.build = _build_r;
421 this->public.task.process = _process_r;
422 }
423
424 return &this->public;
425 }