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
|
/* $OpenBSD: handle_spi_update.c,v 1.7 2001/01/28 22:45:10 niklas Exp $ */
/*
* Copyright 1997-2000 Niels Provos <provos@citi.umich.edu>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Niels Provos.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* handle_spi_update:
* receive a SPI_UPDATE packet; return -1 on failure, 0 on success
*
*/
#ifndef lint
static char rcsid[] = "$OpenBSD: handle_spi_update.c,v 1.7 2001/01/28 22:45:10 niklas Exp $";
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "photuris.h"
#include "packets.h"
#include "state.h"
#include "cookie.h"
#include "buffer.h"
#include "packet.h"
#include "encrypt.h"
#include "validity.h"
#include "attributes.h"
#include "secrets.h"
#include "schedule.h"
#include "scheme.h"
#include "log.h"
#include "spi.h"
#ifdef IPSEC
#include "kernel.h"
#endif
int
handle_spi_update(u_char *packet, int size, char *address,
char *local_address)
{
struct packet_sub parts[] = {
{ "Verification", FLD_VARPRE, 0, 0, },
{ "Attributes", FLD_ATTRIB, FMD_ATT_FILL, 0, },
{ NULL }
};
struct packet spi_msg = {
"SPI Update",
SPI_UPDATE_MIN, 0, parts
};
struct spi_update *header;
struct stateob *st;
struct spiob *spi;
time_t lifetime;
u_int8_t *attributes;
u_int16_t i, attribsize, tmp;
u_int8_t signature[22]; /* XXX - constant */
if (size < SPI_UPDATE_MIN)
return -1; /* packet too small */
header = (struct spi_update *) packet;
st = state_find_cookies(address, header->icookie, header->rcookie);
if (st == NULL) {
packet_size = PACKET_BUFFER_SIZE;
photuris_error_message(st, packet_buffer, &packet_size,
header->icookie, header->rcookie,
0, BAD_COOKIE);
send_packet();
return 0;
}
if (st->phase != SPI_UPDATE && st->phase != SPI_NEEDED)
return 0; /* We don't want this packet */
/* Decrypt message */
tmp = size - SPI_UPDATE_MIN;
if (packet_decrypt(st, SPI_UPDATE_VERIFICATION(header), &tmp) == -1) {
log_print("packet_decrypt() in handle_spi_update()");
goto verification_failed;
}
/* Verify message structure*/
if (packet_check((u_int8_t *)header, size - packet[size-1], &spi_msg) == -1) {
log_print("bad packet structure in handle_spi_update()");
return -1;
}
i = get_validity_verification_size(st);
if (!i || i != parts[0].size || i > sizeof(signature)) {
log_print("verification size mismatch in handle_spi_update()");
goto verification_failed;
}
bcopy(parts[0].where, signature, i);
attributes = parts[1].where;
attribsize = parts[1].size;
if (!isattribsubset(st->oSPIoattrib,st->oSPIoattribsize,
attributes, attribsize)) {
log_print("attributes are not a subset in handle_spi_update()");
return 0;
}
if (!verify_validity_verification(st, signature, packet, size)) {
verification_failed:
log_print("verification failed in handle_spi_update()");
packet_size = PACKET_BUFFER_SIZE;
photuris_error_message(st, packet_buffer, &packet_size,
header->icookie, header->rcookie,
0, VERIFICATION_FAILURE);
send_packet();
return 0;
}
lifetime = (header->lifetime[0]<<16) + (header->lifetime[1]<<8) +
header->lifetime[2];
if (lifetime == 0) {
/* Delete specified security association */
if ((spi = spi_find(st->address, header->SPI)) == NULL) {
log_print("spi_find() in handle_spi_update()");
return -1;
}
#ifdef IPSEC
kernel_unlink_spi(spi);
#endif
spi_value_reset(spi);
spi_unlink(spi);
return 0;
}
/* The State object always retains the latest SPI pairs */
bcopy(header->SPI, st->uSPI, SPI_SIZE);
if ((spi = spi_new(st->address, header->SPI)) == NULL) {
log_print("spi_new() in handle_spi_update()");
return -1;
}
if ((spi->local_address = strdup(local_address)) == NULL) {
log_error("strdup() in handle_spi_update()");
return -1;
}
if((spi->attributes = calloc(attribsize, sizeof(u_int8_t))) == NULL) {
log_error("calloc() in handle_spi_update()");
return -1;
}
spi->flags |= st->flags & IPSEC_NOTIFY ? SPI_NOTIFY : 0;
bcopy(attributes, spi->attributes, attribsize);
spi->attribsize = attribsize;
bcopy(st->icookie, spi->icookie, COOKIE_SIZE);
spi->lifetime = time(NULL) + lifetime;
make_session_keys(st, spi);
spi_insert(spi);
#ifdef IPSEC
kernel_insert_spi(st, spi);
#endif
return 0;
}
|
