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
|
/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single TCP/UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
*
* 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* This plugin is similar to simple.c, except it also logs extra information
* to stdout for every plugin method called by OpenVPN.
*
* See the README file for build instructions.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "openvpn-plugin.h"
/*
* Our context, where we keep our state.
*/
struct plugin_context {
const char *username;
const char *password;
};
/*
* Given an environmental variable name, search
* the envp array for its value, returning it
* if found or NULL otherwise.
*/
static const char *
get_env (const char *name, const char *envp[])
{
if (envp)
{
int i;
const int namelen = strlen (name);
for (i = 0; envp[i]; ++i)
{
if (!strncmp (envp[i], name, namelen))
{
const char *cp = envp[i] + namelen;
if (*cp == '=')
return cp + 1;
}
}
}
return NULL;
}
OPENVPN_EXPORT openvpn_plugin_handle_t
openvpn_plugin_open_v1 (unsigned int *type_mask, const char *argv[], const char *envp[])
{
struct plugin_context *context;
/*
* Allocate our context
*/
context = (struct plugin_context *) calloc (1, sizeof (struct plugin_context));
/*
* Set the username/password we will require.
*/
context->username = "foo";
context->password = "bar";
/*
* Which callbacks to intercept.
*/
*type_mask =
OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_UP) |
OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_DOWN) |
OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_ROUTE_UP) |
OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_IPCHANGE) |
OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_TLS_VERIFY) |
OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_AUTH_USER_PASS_VERIFY) |
OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_CLIENT_CONNECT_V2) |
OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_CLIENT_DISCONNECT) |
OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_LEARN_ADDRESS) |
OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_TLS_FINAL);
return (openvpn_plugin_handle_t) context;
}
void
show (const int type, const char *argv[], const char *envp[])
{
size_t i;
switch (type)
{
case OPENVPN_PLUGIN_UP:
printf ("OPENVPN_PLUGIN_UP\n");
break;
case OPENVPN_PLUGIN_DOWN:
printf ("OPENVPN_PLUGIN_DOWN\n");
break;
case OPENVPN_PLUGIN_ROUTE_UP:
printf ("OPENVPN_PLUGIN_ROUTE_UP\n");
break;
case OPENVPN_PLUGIN_IPCHANGE:
printf ("OPENVPN_PLUGIN_IPCHANGE\n");
break;
case OPENVPN_PLUGIN_TLS_VERIFY:
printf ("OPENVPN_PLUGIN_TLS_VERIFY\n");
break;
case OPENVPN_PLUGIN_AUTH_USER_PASS_VERIFY:
printf ("OPENVPN_PLUGIN_AUTH_USER_PASS_VERIFY\n");
break;
case OPENVPN_PLUGIN_CLIENT_CONNECT_V2:
printf ("OPENVPN_PLUGIN_CLIENT_CONNECT_V2\n");
break;
case OPENVPN_PLUGIN_CLIENT_DISCONNECT:
printf ("OPENVPN_PLUGIN_CLIENT_DISCONNECT\n");
break;
case OPENVPN_PLUGIN_LEARN_ADDRESS:
printf ("OPENVPN_PLUGIN_LEARN_ADDRESS\n");
break;
case OPENVPN_PLUGIN_TLS_FINAL:
printf ("OPENVPN_PLUGIN_TLS_FINAL\n");
break;
default:
printf ("OPENVPN_PLUGIN_?\n");
break;
}
printf ("ARGV\n");
for (i = 0; argv[i] != NULL; ++i)
printf ("%d '%s'\n", (int)i, argv[i]);
printf ("ENVP\n");
for (i = 0; envp[i] != NULL; ++i)
printf ("%d '%s'\n", (int)i, envp[i]);
}
OPENVPN_EXPORT int
openvpn_plugin_func_v1 (openvpn_plugin_handle_t handle, const int type, const char *argv[], const char *envp[])
{
struct plugin_context *context = (struct plugin_context *) handle;
show (type, argv, envp);
/* check entered username/password against what we require */
if (type == OPENVPN_PLUGIN_AUTH_USER_PASS_VERIFY)
{
/* get username/password from envp string array */
const char *username = get_env ("username", envp);
const char *password = get_env ("password", envp);
if (username && !strcmp (username, context->username)
&& password && !strcmp (password, context->password))
return OPENVPN_PLUGIN_FUNC_SUCCESS;
else
return OPENVPN_PLUGIN_FUNC_ERROR;
}
else
return OPENVPN_PLUGIN_FUNC_SUCCESS;
}
OPENVPN_EXPORT void
openvpn_plugin_close_v1 (openvpn_plugin_handle_t handle)
{
struct plugin_context *context = (struct plugin_context *) handle;
free (context);
}
|
