8a0669a124132c1bbc5611f257fcd207d20cd30a
[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 sa_config_t *sa_config;
140
141 this->logger->log(this->logger, CONTROL, "Initializing connection %s",name);
142
143 /* get init_config_t object */
144 status = charon->configuration_manager->get_init_config_for_name(charon->configuration_manager,name,&init_config);
145
146 if (status != SUCCESS)
147 {
148 this->logger->log(this->logger, ERROR | MORE, "Could not retrieve INIT configuration informations for %s",name);
149 return INVALID_ARG;
150 }
151
152 /* configuration can be set */
153 this->ike_sa->set_init_config(this->ike_sa,init_config);
154
155 /* get sa_config_t object */
156 status = charon->configuration_manager->get_sa_config_for_name(charon->configuration_manager,name,&sa_config);
157
158 if (status != SUCCESS)
159 {
160 this->logger->log(this->logger, ERROR | MORE, "Could not retrieve SA configuration informations for %s",name);
161 return INVALID_ARG;
162 }
163
164 /* configuration can be set */
165 this->ike_sa->set_sa_config(this->ike_sa,sa_config);
166
167 this->ike_sa->set_other_host(this->ike_sa,init_config->get_other_host_clone(init_config));
168 this->ike_sa->set_my_host(this->ike_sa,init_config->get_my_host_clone(init_config));
169
170 this->dh_group_number = init_config->get_dh_group_number(init_config,this->dh_group_priority);
171 if (this->dh_group_number == MODP_UNDEFINED)
172 {
173 this->logger->log(this->logger, ERROR | MORE, "Diffie hellman group could not be retrieved with priority %d", this->dh_group_priority);
174 return INVALID_ARG;
175 }
176
177 /* a diffie hellman object could allready exist caused by an failed initiate_connection call */
178 if (this->diffie_hellman == NULL)
179 {
180 this->diffie_hellman = diffie_hellman_create(this->dh_group_number);
181 }
182
183 if (this->sent_nonce.ptr != NULL)
184 {
185 allocator_free(this->sent_nonce.ptr);
186 this->sent_nonce = CHUNK_INITIALIZER;
187 }
188
189 this->logger->log(this->logger, CONTROL|MOST, "Get pseudo random bytes for nonce");
190 randomizer = this->ike_sa->get_randomizer(this->ike_sa);
191 randomizer->allocate_pseudo_random_bytes(randomizer, NONCE_SIZE, &(this->sent_nonce));
192
193 this->logger->log(this->logger, RAW|MOST, "Nonce",&(this->sent_nonce));
194
195 this->build_ike_sa_init_request (this,&message);
196
197 /* generate packet */
198 this->logger->log(this->logger, CONTROL|MOST, "generate packet from message");
199 status = message->generate(message, NULL, NULL, &packet);
200 if (status != SUCCESS)
201 {
202 this->logger->log(this->logger, ERROR, "could not generate packet from message");
203 message->destroy(message);
204 return status;
205 }
206
207 this->logger->log(this->logger, CONTROL|MOST, "Add packet to global send queue");
208 charon->send_queue->add(charon->send_queue, packet);
209
210 /* state can now be changed */
211 this->logger->log(this->logger, CONTROL|MOST, "Create next state object");
212 next_state = ike_sa_init_requested_create(this->ike_sa, this->dh_group_number, this->diffie_hellman, this->sent_nonce);
213
214 /* last message can now be set */
215 status = this->ike_sa->set_last_requested_message(this->ike_sa, message);
216
217 if (status != SUCCESS)
218 {
219 this->logger->log(this->logger, ERROR, "Could not set last requested message");
220 (next_state->state_interface).destroy(&(next_state->state_interface));
221 message->destroy(message);
222 return status;
223 }
224
225 /* state can now be changed */
226 this->ike_sa->set_new_state(this->ike_sa,(state_t *) next_state);
227
228 /* state has NOW changed :-) */
229 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) );
230
231 this->logger->log(this->logger, CONTROL|MOST, "Destroy old sate object");
232 this->destroy_after_state_change(this);
233
234 return SUCCESS;
235 }
236
237 /**
238 * implements private_initiator_init_t.build_ike_sa_init_request
239 */
240 static void build_ike_sa_init_request (private_initiator_init_t *this, message_t **request)
241 {
242 payload_t *payload;
243 message_t *message;
244
245 /* going to build message */
246 this->logger->log(this->logger, CONTROL|MOST, "Going to build message");
247 this->ike_sa->build_message(this->ike_sa, IKE_SA_INIT, TRUE, &message);
248
249 /* build SA payload */
250 this->build_sa_payload(this, &payload);
251 this->logger->log(this->logger, CONTROL|MOST, "add SA payload to message");
252 message->add_payload(message, payload);
253
254 /* build KE payload */
255 this->build_ke_payload(this, &payload);
256 this->logger->log(this->logger, CONTROL|MOST, "add KE payload to message");
257 message->add_payload(message, payload);
258
259 /* build Nonce payload */
260 this->build_nonce_payload(this, &payload);
261 this->logger->log(this->logger, CONTROL|MOST, "add nonce payload to message");
262 message->add_payload(message, payload);
263
264 *request = message;
265 }
266
267 /**
268 * implements private_initiator_init_t.build_sa_payload
269 */
270 static void build_sa_payload(private_initiator_init_t *this, payload_t **payload)
271 {
272 sa_payload_t* sa_payload;
273 size_t proposal_count;
274 ike_proposal_t *proposals;
275 init_config_t *init_config;
276
277 this->logger->log(this->logger, CONTROL|MORE, "building sa payload");
278
279 init_config = this->ike_sa->get_init_config(this->ike_sa);
280
281 proposal_count = init_config->get_proposals(init_config,&proposals);
282
283 sa_payload = sa_payload_create_from_ike_proposals(proposals,proposal_count);
284
285 allocator_free(proposals);
286 *payload = (payload_t *) sa_payload;
287 }
288
289 /**
290 * implements private_initiator_init_t.build_ke_payload
291 */
292 static void build_ke_payload(private_initiator_init_t *this, payload_t **payload)
293 {
294 ke_payload_t *ke_payload;
295 chunk_t key_data;
296
297 this->logger->log(this->logger, CONTROL|MORE, "building ke payload");
298
299 this->diffie_hellman->get_my_public_value(this->diffie_hellman,&key_data);
300
301 ke_payload = ke_payload_create();
302 ke_payload->set_dh_group_number(ke_payload, this->dh_group_number);
303 ke_payload->set_key_exchange_data(ke_payload, key_data);
304
305 allocator_free_chunk(&key_data);
306 *payload = (payload_t *) ke_payload;
307 }
308
309 /**
310 * implements private_initiator_init_t.build_nonce_payload
311 */
312 static void build_nonce_payload(private_initiator_init_t *this, payload_t **payload)
313 {
314 nonce_payload_t *nonce_payload;
315
316 this->logger->log(this->logger, CONTROL|MORE, "building nonce payload");
317
318 nonce_payload = nonce_payload_create();
319
320 nonce_payload->set_nonce(nonce_payload, this->sent_nonce);
321
322 *payload = (payload_t *) nonce_payload;
323 }
324
325 /**
326 * Implements state_t.get_state
327 */
328 static status_t process_message(private_initiator_init_t *this, message_t *message, state_t **new_state)
329 {
330 *new_state = (state_t *) this;
331 this->logger->log(this->logger, ERROR|MORE, "In state INITIATOR_INIT no message is processed");
332 return FAILED;
333 }
334
335 /**
336 * Implements state_t.get_state
337 */
338 static ike_sa_state_t get_state(private_initiator_init_t *this)
339 {
340 return INITIATOR_INIT;
341 }
342
343 /**
344 * Implements state_t.get_state
345 */
346 static void destroy(private_initiator_init_t *this)
347 {
348 this->logger->log(this->logger, CONTROL | MORE, "Going to destroy initiator_init_t state object");
349
350 /* destroy stored proposal */
351 this->logger->log(this->logger, CONTROL | MOST, "Destroy stored proposals");
352
353 /* destroy diffie hellman object */
354 if (this->diffie_hellman != NULL)
355 {
356 this->logger->log(this->logger, CONTROL | MOST, "Destroy diffie_hellman_t object");
357 this->diffie_hellman->destroy(this->diffie_hellman);
358 }
359 if (this->sent_nonce.ptr != NULL)
360 {
361 this->logger->log(this->logger, CONTROL | MOST, "Free memory of sent nonce");
362 allocator_free(this->sent_nonce.ptr);
363 }
364 allocator_free(this);
365 }
366
367 /**
368 * Implements private_initiator_init_t.destroy_after_state_change
369 */
370 static void destroy_after_state_change (private_initiator_init_t *this)
371 {
372 this->logger->log(this->logger, CONTROL | MORE, "Going to destroy initiator_init_t state object");
373
374 /* destroy stored proposal */
375 this->logger->log(this->logger, CONTROL | MOST, "Destroy stored proposals");
376 allocator_free(this);
377 }
378
379 /*
380 * Described in header.
381 */
382 initiator_init_t *initiator_init_create(protected_ike_sa_t *ike_sa)
383 {
384 private_initiator_init_t *this = allocator_alloc_thing(private_initiator_init_t);
385
386 /* interface functions */
387 this->public.state_interface.process_message = (status_t (*) (state_t *,message_t *)) process_message;
388 this->public.state_interface.get_state = (ike_sa_state_t (*) (state_t *)) get_state;
389 this->public.state_interface.destroy = (void (*) (state_t *)) destroy;
390
391 /* public functions */
392 this->public.initiate_connection = (status_t (*)(initiator_init_t *, char *)) initiate_connection;
393
394 /* private functions */
395 this->destroy_after_state_change = destroy_after_state_change;
396 this->build_ike_sa_init_request = build_ike_sa_init_request;
397 this->build_nonce_payload = build_nonce_payload;
398 this->build_sa_payload = build_sa_payload;
399 this->build_ke_payload = build_ke_payload;
400
401 /* private data */
402 this->ike_sa = ike_sa;
403 this->dh_group_priority = 1;
404 this->logger = this->ike_sa->get_logger(this->ike_sa);
405 this->sent_nonce = CHUNK_INITIALIZER;
406
407 return &(this->public);
408 }