summaryrefslogtreecommitdiff
path: root/src/libcharon/encoding/payloads/auth_payload.c
blob: cb44a997ca168ce476b02894836b3031379d0775 (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
/*
 * Copyright (C) 2005-2010 Martin Willi
 * Copyright (C) 2010 revosec AG
 * 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.
 */

#include "auth_payload.h"

#include <encoding/payloads/encodings.h>

typedef struct private_auth_payload_t private_auth_payload_t;

/**
 * Private data of an auth_payload_t object.
 *
 */
struct private_auth_payload_t {

	/**
	 * Public auth_payload_t interface.
	 */
	auth_payload_t public;

	/**
	 * Next payload type.
	 */
	u_int8_t  next_payload;

	/**
	 * Critical flag.
	 */
	bool critical;

	/**
	 * Reserved bits
	 */
	bool reserved_bit[7];

	/**
	 * Reserved bytes
	 */
	u_int8_t reserved_byte[3];

	/**
	 * Length of this payload.
	 */
	u_int16_t payload_length;

	/**
	 * Method of the AUTH Data.
	 */
	u_int8_t auth_method;

	/**
	 * The contained auth data value.
	 */
	chunk_t auth_data;
};

/**
 * Encoding rules to parse or generate a AUTH payload
 *
 * The defined offsets are the positions in a object of type
 * private_auth_payload_t.
 */
encoding_rule_t auth_payload_encodings[] = {
	/* 1 Byte next payload type, stored in the field next_payload */
	{ U_INT_8,			offsetof(private_auth_payload_t, next_payload)		},
	/* the critical bit */
	{ FLAG,				offsetof(private_auth_payload_t, critical)			},
	/* 7 Bit reserved bits */
	{ RESERVED_BIT,		offsetof(private_auth_payload_t, reserved_bit[0])	},
	{ RESERVED_BIT,		offsetof(private_auth_payload_t, reserved_bit[1])	},
	{ RESERVED_BIT,		offsetof(private_auth_payload_t, reserved_bit[2])	},
	{ RESERVED_BIT,		offsetof(private_auth_payload_t, reserved_bit[3])	},
	{ RESERVED_BIT,		offsetof(private_auth_payload_t, reserved_bit[4])	},
	{ RESERVED_BIT,		offsetof(private_auth_payload_t, reserved_bit[5])	},
	{ RESERVED_BIT,		offsetof(private_auth_payload_t, reserved_bit[6])	},
	/* Length of the whole payload*/
	{ PAYLOAD_LENGTH,	offsetof(private_auth_payload_t, payload_length)	},
	/* 1 Byte AUTH type*/
	{ U_INT_8,			offsetof(private_auth_payload_t, auth_method)		},
	/* 3 reserved bytes */
	{ RESERVED_BYTE,	offsetof(private_auth_payload_t, reserved_byte[0])	},
	{ RESERVED_BYTE,	offsetof(private_auth_payload_t, reserved_byte[1])	},
	{ RESERVED_BYTE,	offsetof(private_auth_payload_t, reserved_byte[2])	},
	/* some auth data bytes, length is defined in PAYLOAD_LENGTH */
	{ AUTH_DATA,		offsetof(private_auth_payload_t, auth_data)	}
};

/*
                           1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      ! Next Payload  !C!  RESERVED   !         Payload Length        !
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      ! Auth Method   !                RESERVED                       !
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      !                                                               !
      ~                      Authentication Data                      ~
      !                                                               !
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/

METHOD(payload_t, verify, status_t,
	private_auth_payload_t *this)
{
	return SUCCESS;
}

METHOD(payload_t, get_encoding_rules, void,
	private_auth_payload_t *this, encoding_rule_t **rules, size_t *rule_count)
{
	*rules = auth_payload_encodings;
	*rule_count = countof(auth_payload_encodings);
}

METHOD(payload_t, get_type, payload_type_t,
	private_auth_payload_t *this)
{
	return AUTHENTICATION;
}

METHOD(payload_t, get_next_type, payload_type_t,
	private_auth_payload_t *this)
{
	return this->next_payload;
}

METHOD(payload_t, set_next_type, void,
	private_auth_payload_t *this, payload_type_t type)
{
	this->next_payload = type;
}

METHOD(payload_t, get_length, size_t,
	private_auth_payload_t *this)
{
	return this->payload_length;
}

METHOD(auth_payload_t, set_auth_method, void,
	private_auth_payload_t *this, auth_method_t method)
{
	this->auth_method = method;
}

METHOD(auth_payload_t, get_auth_method, auth_method_t,
	private_auth_payload_t *this)
{
	return this->auth_method;
}

METHOD(auth_payload_t, set_data, void,
	private_auth_payload_t *this, chunk_t data)
{
	free(this->auth_data.ptr);
	this->auth_data = chunk_clone(data);
	this->payload_length = AUTH_PAYLOAD_HEADER_LENGTH + this->auth_data.len;
}

METHOD(auth_payload_t, get_data, chunk_t,
	private_auth_payload_t *this)
{
	return this->auth_data;
}

METHOD2(payload_t, auth_payload_t, destroy, void,
	private_auth_payload_t *this)
{
	free(this->auth_data.ptr);
	free(this);
}

/*
 * Described in header
 */
auth_payload_t *auth_payload_create()
{
	private_auth_payload_t *this;

	INIT(this,
		.public = {
			.payload_interface = {
				.verify = _verify,
				.get_encoding_rules = _get_encoding_rules,
				.get_length = _get_length,
				.get_next_type = _get_next_type,
				.set_next_type = _set_next_type,
				.get_type = _get_type,
				.destroy = _destroy,
			},
			.set_auth_method = _set_auth_method,
			.get_auth_method = _get_auth_method,
			.set_data = _set_data,
			.get_data = _get_data,
			.destroy = _destroy,
		},
		.next_payload = NO_PAYLOAD,
		.payload_length = AUTH_PAYLOAD_HEADER_LENGTH,
	);
	return &this->public;
}