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
|
/* See the file COPYING for licensing information. */
#include <time.h>
#include <assert.h>
#include <event2/event.h>
#include <radsec/radsec.h>
#include <radsec/radsec-impl.h>
#include <radsec/request.h>
#include <radsec/request-impl.h>
static int
_rs_decrypt_mppe(struct rs_request *request, VALUE_PAIR *vp);
int
rs_request_create (struct rs_connection *conn, struct rs_request **req_out)
{
struct rs_request *req = rs_malloc (conn->ctx, sizeof(*req));
if (!req)
return rs_err_conn_push_fl (conn, RSE_NOMEM, __FILE__, __LINE__, NULL);
memset (req, 0, sizeof(*req));
req->conn = conn;
*req_out = req;
return RSE_OK;
}
void
rs_request_destroy (struct rs_request *request)
{
rs_packet_destroy (request->req);
rs_packet_destroy (request->resp);
rs_free (request->conn->ctx, request);
}
#if 0
static void
_timer_cb(evutil_socket_t fd, short what, void *arg)
{
}
#endif
static void
_rs_req_connected(void *user_data)
{
struct rs_request *request = (struct rs_request *)user_data;
}
static void
_rs_req_disconnected(void *user_data)
{
struct rs_request *request = (struct rs_request *)user_data;
}
static void
_rs_req_packet_received(const struct rs_packet *pkt, void *user_data)
{
struct rs_request *request = (struct rs_request *)user_data;
int err;
VALUE_PAIR *vp;
assert (request);
assert (request->conn);
assert (request->req);
err = rad_verify(pkt->rpkt, request->req->rpkt,
pkt->conn->active_peer->secret);
if (err)
return;
for (vp = pkt->rpkt->vps; vp != NULL; vp = vp->next)
{
if (VENDOR(vp->attribute) != VENDORPEC_MS)
continue;
switch (vp->attribute & 0xffff)
{
case PW_MS_MPPE_SEND_KEY:
case PW_MS_MPPE_RECV_KEY:
err = _rs_decrypt_mppe (request, vp);
if (err)
return;
break;
default:
break;
}
}
request->verified = 1;
}
static void
_rs_req_packet_sent(void *user_data)
{
struct rs_request *request = (struct rs_request *)user_data;
}
int
rs_request_send(struct rs_request *request, struct rs_packet *req,
struct rs_packet **resp)
{
int err;
VALUE_PAIR *vp;
struct rs_connection *conn;
assert (request);
assert (request->conn);
conn = request->conn;
request->req = req; /* take ownership */
request->saved_cb = conn->callbacks;
conn->callbacks.connected_cb = _rs_req_connected;
conn->callbacks.disconnected_cb = _rs_req_disconnected;
conn->callbacks.received_cb = _rs_req_packet_received;
conn->callbacks.sent_cb = _rs_req_packet_sent;
assert(request->verified == 0);
vp = paircreate(PW_MESSAGE_AUTHENTICATOR, PW_TYPE_OCTETS);
pairadd(&request->req->rpkt->vps, vp);
err = rs_packet_send(request->req, request);
if (err)
goto cleanup;
err = rs_conn_receive_packet(request->conn, resp);
if (err)
goto cleanup;
if (!request->verified)
{
err = rs_err_conn_push_fl (conn, RSE_BADAUTH, __FILE__, __LINE__, NULL);
goto cleanup;
}
cleanup:
conn->callbacks = request->saved_cb;
return err;
}
/*
* Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include <openssl/md5.h>
static int
_rs_decrypt_mppe(struct rs_request *request, VALUE_PAIR *vp)
{
unsigned char *key = vp->vp_octets;
size_t len = vp->length;
unsigned char plain[1 + MAX_STRING_LEN], *ppos = plain, *res;
const unsigned char *pos;
size_t left, plen;
unsigned char hash[MD5_DIGEST_LENGTH];
int i, first = 1;
const unsigned char *addr[3];
struct rs_connection *conn;
assert (request);
assert (request->conn);
conn = request->conn;
if (vp->type != PW_TYPE_OCTETS)
return rs_err_conn_push_fl (conn, RSE_BADAUTH, __FILE__, __LINE__, NULL);
pos = key + 2;
left = len - 2;
if (left % 16)
return rs_err_conn_push_fl (conn, RSE_BADAUTH, __FILE__, __LINE__, NULL);
plen = left;
if (plen > MAX_STRING_LEN)
return rs_err_conn_push_fl (conn, RSE_BADAUTH, __FILE__, __LINE__, NULL);
plain[0] = 0;
while (left)
{
MD5_CTX md5;
MD5_Init (&md5);
MD5_Update (&md5, conn->active_peer->secret,
strlen (conn->active_peer->secret));
if (first)
{
MD5_Update (&md5, request->req->rpkt->vector, MD5_DIGEST_LENGTH);
MD5_Update (&md5, key, 2);
first = 0;
}
else
{
MD5_Update (&md5, pos - MD5_DIGEST_LENGTH, MD5_DIGEST_LENGTH);
}
MD5_Final (hash, &md5);
for (i = 0; i < MD5_DIGEST_LENGTH; i++)
*ppos++ = *pos++ ^ hash[i];
left -= MD5_DIGEST_LENGTH;
}
if (plain[0] == 0 || plain[0] > plen - 1)
return rs_err_conn_push_fl (conn, RSE_NOMEM, __FILE__, __LINE__, NULL);
memcpy (vp->vp_octets, plain + 1, plain[0]);
vp->length = plain[0];
return RSE_OK;
}
|
