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/*
* 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>
* Copyright (C) 2010 Fox Crypto B.V. <openvpn@fox-it.com>
*
* 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
*/
/**
* @file Control Channel Verification Module PolarSSL backend
*/
#ifndef SSL_VERIFY_POLARSSL_H_
#define SSL_VERIFY_POLARSSL_H_
#include "syshead.h"
#include "misc.h"
#include "manage.h"
#include <polarssl/x509.h>
typedef x509_cert x509_cert_t;
/** @name Function for authenticating a new connection from a remote OpenVPN peer
* @{ */
/**
* Verify that the remote OpenVPN peer's certificate allows setting up a
* VPN tunnel.
* @ingroup control_tls
*
* This callback function is called when a new TLS session is being setup to
* determine whether the remote OpenVPN peer's certificate is allowed to
* connect. It is called for once for every certificate in the chain. The
* callback functionality is configured in the \c init_ssl() function, which
* calls the PolarSSL library's \c ssl_set_verify_callback() function with \c
* verify_callback() as its callback argument.
*
* It checks preverify_ok, and registers the certificate hash. If these steps
* succeed, it calls the \c verify_cert() function, which performs
* OpenVPN-specific verification.
*
* @param session_obj - The OpenVPN \c tls_session associated with this object,
* as set during SSL session setup.
* @param cert - The certificate used by PolarSSL.
* @param cert_depth - The depth of the current certificate in the chain, with
* 0 being the actual certificate.
* @param preverify_ok - Whether the remote OpenVPN peer's certificate
* past verification. A value of 1 means it
* verified successfully, 0 means it failed.
*
* @return The return value indicates whether the supplied certificate is
* allowed to set up a VPN tunnel. The following values can be
* returned:
* - \c 0: failure, this certificate is not allowed to connect.
* - \c 1: success, this certificate is allowed to connect.
*/
int verify_callback (void *session_obj, x509_cert *cert, int cert_depth,
int preverify_ok);
/** @} name Function for authenticating a new connection from a remote OpenVPN peer */
#endif /* SSL_VERIFY_POLARSSL_H_ */
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