summaryrefslogtreecommitdiff
path: root/src/conftest/hooks/set_proposal_number.c
blob: a59d96b6d2b170f5bedf75920809824e7caa4d73 (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
/*
 * Copyright (C) 2010 Martin Willi
 * Copyright (C) 2010 revosec AG
 *
 * 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 "hook.h"

#include <encoding/payloads/sa_payload.h>

typedef struct private_set_proposal_number_t private_set_proposal_number_t;

/**
 * Private data of an set_proposal_number_t object.
 */
struct private_set_proposal_number_t {

	/**
	 * Implements the hook_t interface.
	 */
	hook_t hook;

	/**
	 * Alter requests or responses?
	 */
	bool req;

	/**
	 * ID of message to alter.
	 */
	int id;

	/**
	 * Proposal number to modify
	 */
	int from;

	/**
	 * Proposal number to set
	 */
	int to;
};

/**
 * Copy all algs from given type from one proposal to another
 */
static void copy_proposal_algs(proposal_t *from, proposal_t *to,
							   transform_type_t type)
{
	enumerator_t *enumerator;
	u_int16_t alg, key_size;

	enumerator = from->create_enumerator(from, type);
	while (enumerator->enumerate(enumerator, &alg, &key_size))
	{
		to->add_algorithm(to, type, alg, key_size);
	}
	enumerator->destroy(enumerator);
}

METHOD(listener_t, message, bool,
	private_set_proposal_number_t *this, ike_sa_t *ike_sa, message_t *message,
	bool incoming)
{
	if (!incoming &&
		message->get_request(message) == this->req &&
		message->get_message_id(message) == this->id)
	{
		enumerator_t *enumerator;
		payload_t *payload;
		linked_list_t *list = NULL, *updated;
		sa_payload_t *sa;
		proposal_t *proposal, *new;

		updated = linked_list_create();
		enumerator = message->create_payload_enumerator(message);
		while (enumerator->enumerate(enumerator, &payload))
		{
			if (payload->get_type(payload) == SECURITY_ASSOCIATION)
			{
				sa = (sa_payload_t*)payload;
				list = sa->get_proposals(sa);
				message->remove_payload_at(message, enumerator);
				sa->destroy(sa);
			}
		}
		enumerator->destroy(enumerator);

		if (list)
		{
			enumerator = list->create_enumerator(list);
			while (enumerator->enumerate(enumerator, &proposal))
			{
				if (proposal->get_number(proposal) == this->from)
				{
					DBG1(DBG_CFG, "setting proposal number from %d to %d",
						 this->from, this->to);
					new = proposal_create(proposal->get_protocol(proposal),
										  this->to);
					copy_proposal_algs(proposal, new, ENCRYPTION_ALGORITHM);
					copy_proposal_algs(proposal, new, INTEGRITY_ALGORITHM);
					copy_proposal_algs(proposal, new, PSEUDO_RANDOM_FUNCTION);
					copy_proposal_algs(proposal, new, DIFFIE_HELLMAN_GROUP);
					copy_proposal_algs(proposal, new, EXTENDED_SEQUENCE_NUMBERS);
					updated->insert_last(updated, new);
				}
				else
				{
					list->remove_at(list, enumerator);
					updated->insert_last(updated, proposal);
				}
			}
			enumerator->destroy(enumerator);
		}
		sa = sa_payload_create_from_proposal_list(updated);
		list->destroy_offset(list, offsetof(proposal_t, destroy));
		updated->destroy_offset(updated, offsetof(proposal_t, destroy));
		message->add_payload(message, (payload_t*)sa);
	}
	return TRUE;
}

METHOD(hook_t, destroy, void,
	private_set_proposal_number_t *this)
{
	free(this);
}

/**
 * Create the IKE_AUTH fill hook
 */
hook_t *set_proposal_number_hook_create(char *name)
{
	private_set_proposal_number_t *this;

	INIT(this,
		.hook = {
			.listener = {
				.message = _message,
			},
			.destroy = _destroy,
		},
		.req = conftest->test->get_bool(conftest->test,
										"hooks.%s.request", TRUE, name),
		.id = conftest->test->get_int(conftest->test,
										"hooks.%s.id", 0, name),
		.from = conftest->test->get_int(conftest->test,
										"hooks.%s.from", 0, name),
		.to = conftest->test->get_int(conftest->test,
										"hooks.%s.to", 1, name),
	);

	return &this->hook;
}