- new configuration support added to ike_sa and states
[strongswan.git] / Source / charon / sa / states / initiator_init.c
1 /**
2 * @file initiator_init.c
3 *
4 * @brief Start state of a IKE_SA as initiator
5 *
6 */
7
8 /*
9 * Copyright (C) 2005 Jan Hutter, Martin Willi
10 * Hochschule fuer Technik Rapperswil
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
19 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
20 * for more details.
21 */
22
23 #include "initiator_init.h"
24
25
26 #include <daemon.h>
27 #include <sa/states/state.h>
28 #include <sa/states/ike_sa_init_requested.h>
29 #include <utils/allocator.h>
30 #include <transforms/diffie_hellman.h>
31 #include <encoding/payloads/sa_payload.h>
32 #include <encoding/payloads/ke_payload.h>
33 #include <encoding/payloads/nonce_payload.h>
34
35
36 typedef struct private_initiator_init_t private_initiator_init_t;
37
38 /**
39 * Private data of a initiator_init_t object.
40 *
41 */
42 struct private_initiator_init_t {
43 /**
44 * Methods of the state_t interface.
45 */
46 initiator_init_t public;
47
48 /**
49 * Assigned IKE_SA.
50 */
51 protected_ike_sa_t *ike_sa;
52
53 /**
54 * Diffie hellman object used to generate public DH value.
55 * This objet is passed to the next state of type ike_sa_init_requested_t.
56 */
57 diffie_hellman_t *diffie_hellman;
58
59 /**
60 * DH group number.
61 */
62 u_int16_t dh_group_number;
63
64 /**
65 * DH group priority used to get dh_group_number from configuration manager.
66 * This priority is passed to the next state of type ike_sa_init_requested_t.
67 */
68 u_int16_t dh_group_priority;
69
70 /**
71 * Sent nonce.
72 * This nonce is passed to the next state of type ike_sa_init_requested_t.
73 */
74 chunk_t sent_nonce;
75
76 /**
77 * Logger used to log :-)
78 *
79 * Is logger of ike_sa!
80 */
81 logger_t *logger;
82
83 /**
84 * Builds the IKE_SA_INIT request message.
85 *
86 * @param this calling object
87 * @param message the created message will be stored at this location
88 */
89 void (*build_ike_sa_init_request) (private_initiator_init_t *this, message_t **message);
90
91 /**
92 * Builds the SA payload for this state.
93 *
94 * @param this calling object
95 * @param payload The generated SA payload object of type ke_payload_t is
96 * stored at this location.
97 */
98 void (*build_sa_payload) (private_initiator_init_t *this, payload_t **payload);
99
100 /**
101 * Builds the KE payload for this state.
102 *
103 * @param this calling object
104 * @param payload The generated KE payload object of type ke_payload_t is
105 * stored at this location.
106 */
107 void (*build_ke_payload) (private_initiator_init_t *this, payload_t **payload);
108
109 /**
110 * Builds the NONCE payload for this state.
111 *
112 * @param this calling object
113 * @param payload The generated NONCE payload object of type ke_payload_t is
114 * stored at this location.
115 */
116 void (*build_nonce_payload) (private_initiator_init_t *this, payload_t **payload);
117
118 /**
119 * Destroy function called internally of this class after state change succeeded.
120 *
121 * This destroy function does not destroy objects which were passed to the new state.
122 *
123 * @param this calling object
124 */
125 void (*destroy_after_state_change) (private_initiator_init_t *this);
126 };
127
128 /**
129 * Implements function initiator_init_t.initiate_connection.
130 */
131 static status_t initiate_connection (private_initiator_init_t *this, char *name)
132 {
133 ike_sa_init_requested_t *next_state;
134 message_t *message;
135 packet_t *packet;
136 status_t status;
137 randomizer_t *randomizer;
138 init_config_t *init_config;
139
140 this->logger->log(this->logger, CONTROL, "Initializing connection %s",name);
141
142 /* get init_config_t object */
143 status = charon->configuration_manager->get_init_config_for_name(charon->configuration_manager,name,&init_config);
144
145 if (status != SUCCESS)
146 {
147 this->logger->log(this->logger, ERROR | MORE, "Could not retrieve INIT configuration informations for %s",name);
148 return INVALID_ARG;
149 }
150
151 /* configuration can be set */
152 this->ike_sa->set_init_config(this->ike_sa,init_config);
153
154 this->ike_sa->set_other_host(this->ike_sa,init_config->get_other_host_clone(init_config));
155 this->ike_sa->set_my_host(this->ike_sa,init_config->get_my_host_clone(init_config));
156
157 this->dh_group_number = init_config->get_dh_group_number(init_config,this->dh_group_priority);
158 if (this->dh_group_number == MODP_UNDEFINED)
159 {
160 this->logger->log(this->logger, ERROR | MORE, "Diffie hellman group could not be retrieved with priority %d", this->dh_group_priority);
161 return INVALID_ARG;
162 }
163
164 /* a diffie hellman object could allready exist caused by an failed initiate_connection call */
165 if (this->diffie_hellman == NULL)
166 {
167 this->diffie_hellman = diffie_hellman_create(this->dh_group_number);
168 }
169
170 if (this->sent_nonce.ptr != NULL)
171 {
172 allocator_free(this->sent_nonce.ptr);
173 this->sent_nonce = CHUNK_INITIALIZER;
174 }
175
176 this->logger->log(this->logger, CONTROL|MOST, "Get pseudo random bytes for nonce");
177 randomizer = this->ike_sa->get_randomizer(this->ike_sa);
178 randomizer->allocate_pseudo_random_bytes(randomizer, NONCE_SIZE, &(this->sent_nonce));
179
180 this->logger->log(this->logger, RAW|MOST, "Nonce",&(this->sent_nonce));
181
182 this->build_ike_sa_init_request (this,&message);
183
184 /* generate packet */
185 this->logger->log(this->logger, CONTROL|MOST, "generate packet from message");
186 status = message->generate(message, NULL, NULL, &packet);
187 if (status != SUCCESS)
188 {
189 this->logger->log(this->logger, ERROR, "could not generate packet from message");
190 message->destroy(message);
191 return status;
192 }
193
194 this->logger->log(this->logger, CONTROL|MOST, "Add packet to global send queue");
195 charon->send_queue->add(charon->send_queue, packet);
196
197 /* state can now be changed */
198 this->logger->log(this->logger, CONTROL|MOST, "Create next state object");
199 next_state = ike_sa_init_requested_create(this->ike_sa, this->dh_group_number, this->diffie_hellman, this->sent_nonce);
200
201 /* last message can now be set */
202 status = this->ike_sa->set_last_requested_message(this->ike_sa, message);
203
204 if (status != SUCCESS)
205 {
206 this->logger->log(this->logger, ERROR, "Could not set last requested message");
207 (next_state->state_interface).destroy(&(next_state->state_interface));
208 message->destroy(message);
209 return status;
210 }
211
212 /* state can now be changed */
213 this->ike_sa->set_new_state(this->ike_sa,(state_t *) next_state);
214
215 /* state has NOW changed :-) */
216 this->logger->log(this->logger, CONTROL|MORE, "Changed state of IKE_SA from %s to %s", mapping_find(ike_sa_state_m,INITIATOR_INIT),mapping_find(ike_sa_state_m,IKE_SA_INIT_REQUESTED) );
217
218 this->logger->log(this->logger, CONTROL|MOST, "Destroy old sate object");
219 this->destroy_after_state_change(this);
220
221 return SUCCESS;
222 }
223
224 /**
225 * implements private_initiator_init_t.build_ike_sa_init_request
226 */
227 static void build_ike_sa_init_request (private_initiator_init_t *this, message_t **request)
228 {
229 payload_t *payload;
230 message_t *message;
231
232 /* going to build message */
233 this->logger->log(this->logger, CONTROL|MOST, "Going to build message");
234 this->ike_sa->build_message(this->ike_sa, IKE_SA_INIT, TRUE, &message);
235
236 /* build SA payload */
237 this->build_sa_payload(this, &payload);
238 this->logger->log(this->logger, CONTROL|MOST, "add SA payload to message");
239 message->add_payload(message, payload);
240
241 /* build KE payload */
242 this->build_ke_payload(this, &payload);
243 this->logger->log(this->logger, CONTROL|MOST, "add KE payload to message");
244 message->add_payload(message, payload);
245
246 /* build Nonce payload */
247 this->build_nonce_payload(this, &payload);
248 this->logger->log(this->logger, CONTROL|MOST, "add nonce payload to message");
249 message->add_payload(message, payload);
250
251 *request = message;
252 }
253
254 /**
255 * implements private_initiator_init_t.build_sa_payload
256 */
257 static void build_sa_payload(private_initiator_init_t *this, payload_t **payload)
258 {
259 sa_payload_t* sa_payload;
260 size_t proposal_count;
261 ike_proposal_t *proposals;
262 init_config_t *init_config;
263
264 this->logger->log(this->logger, CONTROL|MORE, "building sa payload");
265
266 init_config = this->ike_sa->get_init_config(this->ike_sa);
267
268 proposal_count = init_config->get_proposals(init_config,&proposals);
269
270 sa_payload = sa_payload_create_from_ike_proposals(proposals,proposal_count);
271
272 allocator_free(proposals);
273 *payload = (payload_t *) sa_payload;
274 }
275
276 /**
277 * implements private_initiator_init_t.build_ke_payload
278 */
279 static void build_ke_payload(private_initiator_init_t *this, payload_t **payload)
280 {
281 ke_payload_t *ke_payload;
282 chunk_t key_data;
283
284 this->logger->log(this->logger, CONTROL|MORE, "building ke payload");
285
286 this->diffie_hellman->get_my_public_value(this->diffie_hellman,&key_data);
287
288 ke_payload = ke_payload_create();
289 ke_payload->set_dh_group_number(ke_payload, this->dh_group_number);
290 ke_payload->set_key_exchange_data(ke_payload, key_data);
291
292 allocator_free_chunk(&key_data);
293 *payload = (payload_t *) ke_payload;
294 }
295
296 /**
297 * implements private_initiator_init_t.build_nonce_payload
298 */
299 static void build_nonce_payload(private_initiator_init_t *this, payload_t **payload)
300 {
301 nonce_payload_t *nonce_payload;
302
303 this->logger->log(this->logger, CONTROL|MORE, "building nonce payload");
304
305 nonce_payload = nonce_payload_create();
306
307 nonce_payload->set_nonce(nonce_payload, this->sent_nonce);
308
309 *payload = (payload_t *) nonce_payload;
310 }
311
312 /**
313 * Implements state_t.get_state
314 */
315 static status_t process_message(private_initiator_init_t *this, message_t *message, state_t **new_state)
316 {
317 *new_state = (state_t *) this;
318 this->logger->log(this->logger, ERROR|MORE, "In state INITIATOR_INIT no message is processed");
319 return FAILED;
320 }
321
322 /**
323 * Implements state_t.get_state
324 */
325 static ike_sa_state_t get_state(private_initiator_init_t *this)
326 {
327 return INITIATOR_INIT;
328 }
329
330 /**
331 * Implements state_t.get_state
332 */
333 static void destroy(private_initiator_init_t *this)
334 {
335 this->logger->log(this->logger, CONTROL | MORE, "Going to destroy initiator_init_t state object");
336
337 /* destroy stored proposal */
338 this->logger->log(this->logger, CONTROL | MOST, "Destroy stored proposals");
339
340 /* destroy diffie hellman object */
341 if (this->diffie_hellman != NULL)
342 {
343 this->logger->log(this->logger, CONTROL | MOST, "Destroy diffie_hellman_t object");
344 this->diffie_hellman->destroy(this->diffie_hellman);
345 }
346 if (this->sent_nonce.ptr != NULL)
347 {
348 this->logger->log(this->logger, CONTROL | MOST, "Free memory of sent nonce");
349 allocator_free(this->sent_nonce.ptr);
350 }
351 allocator_free(this);
352 }
353
354 /**
355 * Implements private_initiator_init_t.destroy_after_state_change
356 */
357 static void destroy_after_state_change (private_initiator_init_t *this)
358 {
359 this->logger->log(this->logger, CONTROL | MORE, "Going to destroy initiator_init_t state object");
360
361 /* destroy stored proposal */
362 this->logger->log(this->logger, CONTROL | MOST, "Destroy stored proposals");
363 allocator_free(this);
364 }
365
366 /*
367 * Described in header.
368 */
369 initiator_init_t *initiator_init_create(protected_ike_sa_t *ike_sa)
370 {
371 private_initiator_init_t *this = allocator_alloc_thing(private_initiator_init_t);
372
373 /* interface functions */
374 this->public.state_interface.process_message = (status_t (*) (state_t *,message_t *)) process_message;
375 this->public.state_interface.get_state = (ike_sa_state_t (*) (state_t *)) get_state;
376 this->public.state_interface.destroy = (void (*) (state_t *)) destroy;
377
378 /* public functions */
379 this->public.initiate_connection = (status_t (*)(initiator_init_t *, char *)) initiate_connection;
380
381 /* private functions */
382 this->destroy_after_state_change = destroy_after_state_change;
383 this->build_ike_sa_init_request = build_ike_sa_init_request;
384 this->build_nonce_payload = build_nonce_payload;
385 this->build_sa_payload = build_sa_payload;
386 this->build_ke_payload = build_ke_payload;
387
388 /* private data */
389 this->ike_sa = ike_sa;
390 this->dh_group_priority = 1;
391 this->logger = this->ike_sa->get_logger(this->ike_sa);
392 this->sent_nonce = CHUNK_INITIALIZER;
393
394 return &(this->public);
395 }