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
|
/*
* 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 "tls_protection.h"
#include <utils/debug.h>
typedef struct private_tls_protection_t private_tls_protection_t;
/**
* Private data of an tls_protection_t object.
*/
struct private_tls_protection_t {
/**
* Public tls_protection_t interface.
*/
tls_protection_t public;
/**
* negotiated TLS version
*/
tls_version_t version;
/**
* Upper layer, TLS record compression
*/
tls_compression_t *compression;
/**
* TLS alert handler
*/
tls_alert_t *alert;
/**
* Sequence number of incoming records
*/
u_int64_t seq_in;
/**
* Sequence number for outgoing records
*/
u_int64_t seq_out;
/**
* AEAD transform for inbound traffic
*/
tls_aead_t *aead_in;
/**
* AEAD transform for outbound traffic
*/
tls_aead_t *aead_out;
};
METHOD(tls_protection_t, process, status_t,
private_tls_protection_t *this, tls_content_type_t type, chunk_t data)
{
if (this->alert->fatal(this->alert))
{ /* don't accept more input, fatal error occurred */
return NEED_MORE;
}
if (this->aead_in)
{
if (!this->aead_in->decrypt(this->aead_in, this->version,
type, this->seq_in, &data))
{
DBG1(DBG_TLS, "TLS record decryption failed");
this->alert->add(this->alert, TLS_FATAL, TLS_BAD_RECORD_MAC);
return NEED_MORE;
}
}
if (type == TLS_CHANGE_CIPHER_SPEC)
{
this->seq_in = 0;
}
else
{
this->seq_in++;
}
return this->compression->process(this->compression, type, data);
}
METHOD(tls_protection_t, build, status_t,
private_tls_protection_t *this, tls_content_type_t *type, chunk_t *data)
{
status_t status;
status = this->compression->build(this->compression, type, data);
if (*type == TLS_CHANGE_CIPHER_SPEC)
{
this->seq_out = 0;
return status;
}
if (status == NEED_MORE)
{
if (this->aead_out)
{
if (!this->aead_out->encrypt(this->aead_out, this->version,
*type, this->seq_out, data))
{
DBG1(DBG_TLS, "TLS record encryption failed");
chunk_free(data);
return FAILED;
}
}
this->seq_out++;
}
return status;
}
METHOD(tls_protection_t, set_cipher, void,
private_tls_protection_t *this, bool inbound, tls_aead_t *aead)
{
if (inbound)
{
this->aead_in = aead;
}
else
{
this->aead_out = aead;
}
}
METHOD(tls_protection_t, set_version, void,
private_tls_protection_t *this, tls_version_t version)
{
this->version = version;
}
METHOD(tls_protection_t, destroy, void,
private_tls_protection_t *this)
{
free(this);
}
/**
* See header
*/
tls_protection_t *tls_protection_create(tls_compression_t *compression,
tls_alert_t *alert)
{
private_tls_protection_t *this;
INIT(this,
.public = {
.process = _process,
.build = _build,
.set_cipher = _set_cipher,
.set_version = _set_version,
.destroy = _destroy,
},
.alert = alert,
.compression = compression,
);
return &this->public;
}
|
