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openvpn_radauth.c
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openvpn_radauth.c
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/*
* Copyright (c) 2010 Tamas Tevesz <[email protected]>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_LIBBSD
#include <bsd/string.h>
#endif
#include <syslog.h>
#include <radlib.h>
#include "credentials.h"
#ifndef OPENVPN_RADIUS_CONF
#define OPENVPN_RADIUS_CONF "/etc/openvpn/radius.conf"
#endif
#define OPENVPN_AUTH_SUCC 0
#define OPENVPN_AUTH_FAIL 1
#define OPENVPN_USERPASS_LEN 128
extern char *__progname;
static int check_radius( const char *, const char * );
int main( int argc, char **argv )
{
char username[ OPENVPN_USERPASS_LEN ], password[ OPENVPN_USERPASS_LEN ];
int res;
res = OPENVPN_AUTH_FAIL;
if( argc >= 2 &&
(strcmp(argv[1], "-h") == 0 ||
strcmp(argv[1], "-help") == 0 ||
strcmp(argv[1], "--help") == 0)
) {
fprintf(stderr, "%s: RADIUS authentication script for OpenVPN\n", __progname);
fprintf(stderr, "See https://github.com/melak/openvpn_radauth for instructions.\n");
goto out;
}
openlog( __progname, LOG_PID|LOG_NDELAY, LOG_AUTH );
if( getcreds( argc, argv, username, password, OPENVPN_USERPASS_LEN ) < 0 ) {
#ifdef DEBUG
syslog( LOG_ERR, "Unable to get supplied credentials" );
#endif
goto out;
}
if( check_radius( username, password ) == 1 ) {
syslog( LOG_INFO, "Accepted password for %s from %s",
username, peer_address() ? peer_address() : "UNKNOWN" );
res = OPENVPN_AUTH_SUCC;
} else {
syslog( LOG_INFO, "Bad password for %s from %s,",
username, peer_address() ? peer_address() : "UNKNOWN" );
}
out:
explicit_bzero( username, OPENVPN_USERPASS_LEN );
explicit_bzero( password, OPENVPN_USERPASS_LEN );
closelog();
return res;
}
static int check_radius( const char *username, const char *password )
{
struct rad_handle *rh;
int res, rad_res;
rad_res = res = 0;
rh = NULL;
rh = rad_auth_open();
if( rh == NULL ) {
syslog( LOG_ERR, "Unable to initialise libradius" );
goto out;
}
if( rad_config( rh, OPENVPN_RADIUS_CONF ) < 0 ||
rad_create_request( rh, RAD_ACCESS_REQUEST ) < 0 ||
rad_put_string( rh, RAD_USER_NAME, username ) < 0 ||
rad_put_string( rh, RAD_USER_PASSWORD, password ) < 0 ) {
syslog( LOG_ERR, "Unable to create RADIUS authn request: %s",
rad_strerror( rh ) );
goto out;
}
if( peer_address() != NULL &&
rad_put_string( rh, RAD_CALLING_STATION_ID, peer_address() ) < 0 ) {
syslog( LOG_ERR, "Unable to add Calling-Station-Id to RADIUS request: %s",
rad_strerror( rh ) );
goto out;
}
if( rad_put_message_authentic( rh ) < 0 ) {
syslog( LOG_ERR, "Unable to add Message-Authenticator to RADIUS request: %s",
rad_strerror( rh ) );
goto out;
}
rad_res = rad_send_request( rh );
if( rad_res < 0 ) {
syslog( LOG_ERR, "RADIUS error: %s, result: %d", rad_strerror( rh ), rad_res );
} else if( rad_res == RAD_ACCESS_ACCEPT ) {
res = 1;
}
#ifdef DEBUG
syslog( LOG_INFO, "RADIUS %sed %s", res == 1 ? "accept" : "reject", username );
#endif
out:
if( rh ) {
rad_close( rh );
}
return res;
}