- memory allocation checks removed
[strongswan.git] / Source / charon / sa / states / ike_sa_init_requested.c
1 /**
2 * @file ike_sa_init_requested.c
3 *
4 * @brief State of a IKE_SA after requesting an IKE_SA_INIT
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 "ike_sa_init_requested.h"
24
25 #include <globals.h>
26 #include <utils/allocator.h>
27 #include <encoding/payloads/sa_payload.h>
28 #include <encoding/payloads/ke_payload.h>
29 #include <encoding/payloads/nonce_payload.h>
30 #include <transforms/diffie_hellman.h>
31
32
33 typedef struct private_ike_sa_init_requested_t private_ike_sa_init_requested_t;
34
35 /**
36 * Private data of a ike_sa_init_requested_t object.
37 *
38 */
39 struct private_ike_sa_init_requested_t {
40 /**
41 * methods of the state_t interface
42 */
43 ike_sa_init_requested_t public;
44
45 /**
46 * Assigned IKE_SA
47 */
48 protected_ike_sa_t *ike_sa;
49
50 /**
51 * Diffie Hellman object used to compute shared secret
52 */
53 diffie_hellman_t *diffie_hellman;
54
55 /**
56 * Shared secret of successful exchange
57 */
58 chunk_t shared_secret;
59
60 /**
61 * Sent nonce value
62 */
63 chunk_t sent_nonce;
64
65 /**
66 * Received nonce
67 */
68 chunk_t received_nonce;
69
70 /**
71 * DH group priority used to get dh_group_number from configuration manager.
72 *
73 * Currently uused but usable if informational messages of unsupported dh group number are processed.
74 */
75 u_int16_t dh_group_priority;
76
77 /**
78 * Logger used to log data
79 *
80 * Is logger of ike_sa!
81 */
82 logger_t *logger;
83 };
84
85 /**
86 * Implements state_t.get_state
87 */
88 static status_t process_message(private_ike_sa_init_requested_t *this, message_t *message)
89 {
90 status_t status;
91 iterator_t *payloads;
92 exchange_type_t exchange_type;
93 u_int64_t responder_spi;
94 ike_sa_id_t *ike_sa_id;
95
96
97 exchange_type = message->get_exchange_type(message);
98 if (exchange_type != IKE_SA_INIT)
99 {
100 this->logger->log(this->logger, ERROR | MORE, "Message of type %s not supported in state ike_sa_init_requested",mapping_find(exchange_type_m,exchange_type));
101 return FAILED;
102 }
103
104 if (message->get_request(message))
105 {
106 this->logger->log(this->logger, ERROR | MORE, "Only responses of type IKE_SA_INIT supported in state ike_sa_init_requested");
107 return FAILED;
108 }
109
110 /* parse incoming message */
111 status = message->parse_body(message, NULL, NULL);
112 if (status != SUCCESS)
113 {
114 this->logger->log(this->logger, ERROR | MORE, "Could not parse body");
115 return status;
116 }
117
118 responder_spi = message->get_responder_spi(message);
119 ike_sa_id = this->ike_sa->public.get_id(&(this->ike_sa->public));
120 ike_sa_id->set_responder_spi(ike_sa_id,responder_spi);
121
122 /* iterate over incoming payloads */
123 message->get_payload_iterator(message, &payloads);
124 while (payloads->has_next(payloads))
125 {
126 payload_t *payload;
127 payloads->current(payloads, (void**)&payload);
128
129 this->logger->log(this->logger, CONTROL|MORE, "Processing payload %s", mapping_find(payload_type_m, payload->get_type(payload)));
130 switch (payload->get_type(payload))
131 {
132 case SECURITY_ASSOCIATION:
133 {
134 sa_payload_t *sa_payload = (sa_payload_t*)payload;
135 iterator_t *suggested_proposals;
136 proposal_substructure_t *suggested_proposal;
137 bool valid;
138
139
140 /* get the list of suggested proposals */
141 status = sa_payload->create_proposal_substructure_iterator(sa_payload, &suggested_proposals, TRUE);
142 if (status != SUCCESS)
143 {
144 this->logger->log(this->logger, ERROR, "Fatal errror: Could not create iterator on suggested proposals");
145 payloads->destroy(payloads);
146 return status;
147 }
148
149 /* now let the configuration-manager check the selected proposals*/
150 this->logger->log(this->logger, CONTROL | MOST, "Check suggested proposals");
151 status = global_configuration_manager->check_selected_proposals_for_host(global_configuration_manager,
152 this->ike_sa->get_other_host(this->ike_sa), suggested_proposals,&valid);
153 if (status != SUCCESS)
154 {
155 this->logger->log(this->logger, ERROR | MORE, "Could not check suggested proposals!");
156 suggested_proposals->destroy(suggested_proposals);
157 payloads->destroy(payloads);
158 return status;
159 }
160
161 if (!valid)
162 {
163 this->logger->log(this->logger, ERROR | MORE, "Suggested proposals not accepted!");
164 payloads->destroy(payloads);
165 return status;
166 }
167
168
169 /* let the ike_sa create their own transforms from proposal informations */
170 suggested_proposals->reset(suggested_proposals);
171 /* TODO check for true*/
172 suggested_proposals->has_next(suggested_proposals);
173 status = suggested_proposals->current(suggested_proposals,(void **)&suggested_proposal);
174 suggested_proposals->destroy(suggested_proposals);
175 if (status != SUCCESS)
176 {
177 this->logger->log(this->logger, ERROR | MORE, "Could not get first proposal");
178 payloads->destroy(payloads);
179 return status;
180 }
181
182 status = this->ike_sa->create_transforms_from_proposal(this->ike_sa,suggested_proposal);
183 if (status != SUCCESS)
184 {
185 this->logger->log(this->logger, ERROR | MORE, "Transform objects could not be created from selected proposal");
186 payloads->destroy(payloads);
187 return status;
188 }
189
190
191 /* ok, we have what we need for sa_payload */
192 break;
193 }
194 case KEY_EXCHANGE:
195 {
196 ke_payload_t *ke_payload = (ke_payload_t*)payload;
197
198 status = this->diffie_hellman->set_other_public_value(this->diffie_hellman, ke_payload->get_key_exchange_data(ke_payload));
199 if (status != SUCCESS)
200 {
201 this->logger->log(this->logger, ERROR, "Could not set other public value for DH exchange. Status %s",mapping_find(status_m,status));
202 payloads->destroy(payloads);
203 return OUT_OF_RES;
204 }
205
206 /* shared secret is computed AFTER processing of all payloads... */
207 break;
208 }
209 case NONCE:
210 {
211 nonce_payload_t *nonce_payload = (nonce_payload_t*)payload;
212
213 if (this->received_nonce.ptr != NULL)
214 {
215 this->logger->log(this->logger, CONTROL | MOST, "Destroy existing received nonce");
216 allocator_free(this->received_nonce.ptr);
217 this->received_nonce.ptr = NULL;
218 this->received_nonce.len = 0;
219 }
220
221 status = nonce_payload->get_nonce(nonce_payload, &(this->received_nonce));
222 if (status != SUCCESS)
223 {
224 this->logger->log(this->logger, ERROR, "Fatal error: Could not get received nonce");
225 payloads->destroy(payloads);
226 return OUT_OF_RES;
227 }
228
229 break;
230 }
231 default:
232 {
233 this->logger->log(this->logger, ERROR, "Fatal errror: Payload type not supported!!!!");
234 payloads->destroy(payloads);
235 return FAILED;
236 }
237
238 }
239
240 }
241 payloads->destroy(payloads);
242
243 if (this->shared_secret.ptr != NULL)
244 {
245 this->logger->log(this->logger, CONTROL | MOST, "Destroy existing shared_secret");
246 allocator_free(this->shared_secret.ptr);
247 this->shared_secret.ptr = NULL;
248 this->shared_secret.len = 0;
249 }
250
251
252 /* store shared secret */
253 this->logger->log(this->logger, CONTROL | MOST, "Retrieve shared secret and store it");
254 status = this->diffie_hellman->get_shared_secret(this->diffie_hellman, &(this->shared_secret));
255 this->logger->log_chunk(this->logger, PRIVATE, "Shared secret", &this->shared_secret);
256
257 status = this->ike_sa->compute_secrets(this->ike_sa,this->shared_secret,this->sent_nonce, this->received_nonce);
258 if (status != SUCCESS)
259 {
260 /* secrets could not be computed */
261 this->logger->log(this->logger, ERROR | MORE, "Secrets could not be computed!");
262 return status;
263 }
264
265
266
267
268 /****************************
269 *
270 * TODO
271 *
272 * Send IKE_SA_AUTH request
273 *
274 * Make state change
275 *
276 ****************************/
277
278
279 /* set up the reply */
280 // status = this->ike_sa->build_message(this->ike_sa, IKE_SA_INIT, FALSE, &response);
281 // if (status != SUCCESS)
282 // {
283 // return status;
284 // }
285
286 // response->destroy(response);
287
288
289
290 return SUCCESS;
291 }
292
293 /**
294 * Implements state_t.get_state
295 */
296 static ike_sa_state_t get_state(private_ike_sa_init_requested_t *this)
297 {
298 return IKE_SA_INIT_REQUESTED;
299 }
300
301 /**
302 * Implements state_t.get_state
303 */
304 static status_t destroy(private_ike_sa_init_requested_t *this)
305 {
306 this->logger->log(this->logger, CONTROL | MORE, "Going to destroy state of type ike_sa_init_requested_t");
307
308 this->logger->log(this->logger, CONTROL | MOST, "Destroy diffie hellman object");
309 this->diffie_hellman->destroy(this->diffie_hellman);
310 if (this->sent_nonce.ptr != NULL)
311 {
312 this->logger->log(this->logger, CONTROL | MOST, "Destroy sent nonce");
313 allocator_free(this->sent_nonce.ptr);
314 }
315 if (this->received_nonce.ptr != NULL)
316 {
317 this->logger->log(this->logger, CONTROL | MOST, "Destroy received nonce");
318 allocator_free(this->received_nonce.ptr);
319 }
320
321 if (this->shared_secret.ptr != NULL)
322 {
323 this->logger->log(this->logger, CONTROL | MOST, "Destroy shared secret");
324 allocator_free(this->shared_secret.ptr);
325 }
326
327 allocator_free(this);
328 return SUCCESS;
329 }
330
331 /*
332 * Described in header.
333 */
334 ike_sa_init_requested_t *ike_sa_init_requested_create(protected_ike_sa_t *ike_sa,u_int16_t dh_group_priority, diffie_hellman_t *diffie_hellman, chunk_t sent_nonce)
335 {
336 private_ike_sa_init_requested_t *this = allocator_alloc_thing(private_ike_sa_init_requested_t);
337
338 if (this == NULL)
339 {
340 return NULL;
341 }
342
343 /* interface functions */
344 this->public.state_interface.process_message = (status_t (*) (state_t *,message_t *)) process_message;
345 this->public.state_interface.get_state = (ike_sa_state_t (*) (state_t *)) get_state;
346 this->public.state_interface.destroy = (status_t (*) (state_t *)) destroy;
347
348 /* private data */
349 this->ike_sa = ike_sa;
350 this->received_nonce.ptr = NULL;
351 this->received_nonce.len = 0;
352 this->shared_secret.ptr = NULL;
353 this->shared_secret.len = 0;
354 this->logger = this->ike_sa->get_logger(this->ike_sa);
355 this->diffie_hellman = diffie_hellman;
356 this->sent_nonce = sent_nonce;
357 this->dh_group_priority = dh_group_priority;
358
359 return &(this->public);
360 }