summaryrefslogtreecommitdiff
path: root/src/libcharon/encoding/message.h
blob: 2c7718f49d212fc8795b7103579f0f707b50ce47 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
/*
 * Copyright (C) 2006-2007 Tobias Brunner
 * Copyright (C) 2005-2009 Martin Willi
 * Copyright (C) 2006 Daniel Roethlisberger
 * Copyright (C) 2005 Jan Hutter
 * Hochschule fuer Technik Rapperswil
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 */

/**
 * @defgroup message message
 * @{ @ingroup encoding
 */

#ifndef MESSAGE_H_
#define MESSAGE_H_

typedef struct message_t message_t;

#include <library.h>
#include <sa/ike_sa_id.h>
#include <network/packet.h>
#include <encoding/payloads/ike_header.h>
#include <encoding/payloads/notify_payload.h>
#include <utils/linked_list.h>
#include <crypto/crypters/crypter.h>
#include <crypto/signers/signer.h>

/**
 * This class is used to represent an IKEv2-Message.
 *
 * The message handles parsing and generation of payloads
 * via parser_t/generator_t. Encryption is done transparently
 * via the encryption_payload_t. A set of rules for messages
 * and payloads does check parsed messages.
 */
struct message_t {

	/**
	 * Sets the IKE major version of the message.
	 *
	 * @param major_version	major version to set
	 */
	void (*set_major_version) (message_t *this,u_int8_t major_version);

	/**
	 * Gets the IKE major version of the message.
	 *
	 * @return				major version of the message
	 */
	u_int8_t (*get_major_version) (message_t *this);

	/**
	 * Sets the IKE minor version of the message.
	 *
	 * @param minor_version	minor version to set
	 */
	void (*set_minor_version) (message_t *this,u_int8_t minor_version);

	/**
	 * Gets the IKE minor version of the message.
	 *
	 * @return				minor version of the message
	 */
	u_int8_t (*get_minor_version) (message_t *this);

	/**
	 * Sets the Message ID of the message.
	 *
	 * @param message_id	message_id to set
	 */
	void (*set_message_id) (message_t *this,u_int32_t message_id);

	/**
	 * Gets the Message ID of the message.
	 *
	 * @return				message_id type of the message
	 */
	u_int32_t (*get_message_id) (message_t *this);

	/**
	 * Gets the initiator SPI of the message.
	 *
	 * @return				initiator spi of the message
	 */
	u_int64_t (*get_initiator_spi) (message_t *this);

	/**
	 * Gets the responder SPI of the message.
	 *
	 * @return				responder spi of the message
	 */
	u_int64_t (*get_responder_spi) (message_t *this);

	/**
	 * Sets the IKE_SA ID of the message.
	 *
	 * ike_sa_id gets cloned.
	 *
	 * @param ike_sa_id		ike_sa_id to set
	 */
	void (*set_ike_sa_id) (message_t *this, ike_sa_id_t * ike_sa_id);

	/**
	 * Gets the IKE_SA ID of the message.
	 *
	 * The ike_sa_id points to the message internal id, do not modify.
	 *
	 * @return				ike_sa_id of message
	 */
	ike_sa_id_t *(*get_ike_sa_id) (message_t *this);

	/**
	 * Sets the exchange type of the message.
	 *
	 * @param exchange_type	exchange_type to set
	 */
	void (*set_exchange_type) (message_t *this,exchange_type_t exchange_type);

	/**
	 * Gets the exchange type of the message.
	 *
	 * @return				exchange type of the message
	 */
	exchange_type_t (*get_exchange_type) (message_t *this);

	/**
	 * Gets the payload type of the first payload.
	 *
	 * @return				payload type of the first payload
	 */
	payload_type_t (*get_first_payload_type) (message_t *this);

	/**
	 * Sets the request flag.
	 *
	 * @param request		TRUE if message is a request, FALSE if it is a reply
	 */
	void (*set_request) (message_t *this, bool request);

	/**
	 * Gets request flag.
	 *
	 * @return				TRUE if message is a request, FALSE if it is a reply
	 */
	bool (*get_request) (message_t *this);

	/**
	 * Append a payload to the message.
	 *
	 * If the payload must be encrypted is not specified here. Encryption
	 * of payloads is evaluated via internal rules for the messages and
	 * is done before generation. The order of payloads may change, since
	 * all payloads to encrypt are added to the encryption payload, which is
	 * always the last one.
	 *
	 * @param payload 		payload to append
	 */
	void (*add_payload) (message_t *this, payload_t *payload);

	/**
	 * Build a notify payload and add it to the message.
	 *
	 * This is a helper method to create notify messages or add
	 * notify payload to messages. The flush parameter specifies if existing
	 * payloads should get removed before appending the notify.
	 *
	 * @param flush			TRUE to remove existing payloads
	 * @param type			type of the notify
	 * @param data			a chunk of data to add to the notify, gets cloned
	 */
	void (*add_notify) (message_t *this, bool flush, notify_type_t type,
						chunk_t data);

	/**
	 * Parses header of message.
	 *
	 * Begins parisng of a message created via message_create_from_packet().
	 * The parsing context is stored, so a subsequent call to parse_body()
	 * will continue the parsing process.
	 *
	 * @return
	 * 					- SUCCESS if header could be parsed
	 *					- PARSE_ERROR if corrupted/invalid data found
	 * 					- FAILED if consistence check of header failed
	 */
	status_t (*parse_header) (message_t *this);

	/**
	 * Parses body of message.
	 *
	 * The body gets not only parsed, but rather it gets verified.
	 * All payloads are verified if they are allowed to exist in the message
	 * of this type and if their own structure is ok.
	 * If there are encrypted payloads, they get decrypted via the supplied
	 * crypter. Also the message integrity gets verified with the supplied
	 * signer.
	 * Crypter/signer can be omitted (by passing NULL) when no encryption
	 * payload is expected.
	 *
	 * @param crypter	crypter to decrypt encryption payloads
	 * @param signer	signer to verifiy a message with an encryption payload
	 * @return
	 * 					- SUCCESS if parsing successful
	 * 					- NOT_SUPPORTED if ciritcal unknown payloads found
	 * 					- NOT_SUPPORTED if message type is not supported!
	 *					- PARSE_ERROR if message parsing failed
	 * 					- VERIFY_ERROR if message verification failed (bad syntax)
	 * 					- FAILED if integrity check failed
	 * 					- INVALID_STATE if crypter/signer not supplied, but needed
	 */
	status_t (*parse_body) (message_t *this, crypter_t *crypter, signer_t *signer);

	/**
	 * Generates the UDP packet of specific message.
	 *
	 * Payloads which must be encrypted are generated first and added to
	 * an encryption payload. This encryption payload will get encrypted via
	 * the supplied crypter. Then all other payloads and the header get generated.
	 * After that, the checksum is added to the encryption payload over the full
	 * message.
	 * Crypter/signer can be omitted (by passing NULL) when no encryption
	 * payload is expected.
	 * Generation is only done once, multiple calls will just return a packet copy.
	 *
	 * @param crypter	crypter to use when a payload must be encrypted
	 * @param signer	signer to build a mac
	 * @param packet	copy of generated packet
	 * @return
	 * 					- SUCCESS if packet could be generated
	 * 					- INVALID_STATE if exchange type is currently not set
	 * 					- NOT_FOUND if no rules found for message generation
	 * 					- INVALID_STATE if crypter/signer not supplied but needed.
	 */
	status_t (*generate) (message_t *this, crypter_t *crypter, signer_t *signer, packet_t **packet);

	/**
	 * Gets the source host informations.
	 *
	 * @warning Returned host_t object is not getting cloned,
	 * do not destroy nor modify.
	 *
	 * @return			host_t object representing source host
	 */
	host_t * (*get_source) (message_t *this);

	/**
	 * Sets the source host informations.
	 *
	 * @warning host_t object is not getting cloned and gets destroyed by
	 * 			message_t.destroy or next call of message_t.set_source.
	 *
	 * @param host		host_t object representing source host
	 */
	void (*set_source) (message_t *this, host_t *host);

	/**
	 * Gets the destination host informations.
	 *
	 * @warning Returned host_t object is not getting cloned,
	 * do not destroy nor modify.
	 *
	 * @return			host_t object representing destination host
	 */
	host_t * (*get_destination) (message_t *this);

	/**
	 * Sets the destination host informations.
	 *
	 * @warning host_t object is not getting cloned and gets destroyed by
	 * 			message_t.destroy or next call of message_t.set_destination.
	 *
	 * @param host		host_t object representing destination host
	 */
	void (*set_destination) (message_t *this, host_t *host);

	/**
	 * Create an enumerator over all payloads.
	 *
	 * @return			enumerator over payload_t
	 */
	enumerator_t * (*create_payload_enumerator) (message_t *this);

	/**
	 * Find a payload of a specific type.
	 *
	 * Returns the first occurance.
	 *
	 * @param type		type of the payload to find
	 * @return			payload, or NULL if no such payload found
	 */
	payload_t* (*get_payload) (message_t *this, payload_type_t type);

	/**
	 * Get the first notify payload of a specific type.
	 *
	 * @param type		type of notification payload
	 * @return			notify payload, NULL if no such notify found
	 */
	notify_payload_t* (*get_notify)(message_t *this, notify_type_t type);

	/**
	 * Returns a clone of the internal stored packet_t object.
	 *
	 * @return			packet_t object as clone of internal one
	 */
	packet_t * (*get_packet) (message_t *this);

	/**
	 * Returns a clone of the internal stored packet_t data.
	 *
	 * @return			clone of the internal stored packet_t data.
	 */
	chunk_t (*get_packet_data) (message_t *this);

	/**
	 * Destroys a message and all including objects.
	 */
	void (*destroy) (message_t *this);
};

/**
 * Creates an message_t object from a incoming UDP Packet.
 *
 * @warning the given packet_t object is not copied and gets
 *			destroyed in message_t's destroy call.
 *
 * - exchange_type is set to NOT_SET
 * - original_initiator is set to TRUE
 * - is_request is set to TRUE
 * Call message_t.parse_header afterwards.
 *
 * @param packet		packet_t object which is assigned to message
 * @return 				message_t object
 */
message_t * message_create_from_packet(packet_t *packet);


/**
 * Creates an empty message_t object.
 *
 * - exchange_type is set to NOT_SET
 * - original_initiator is set to TRUE
 * - is_request is set to TRUE
 *
 * @return message_t object
 */
message_t * message_create(void);

#endif /** MESSAGE_H_ @}*/