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authorAlberto Gonzalez Iniesta <agi@inittab.org>2012-11-05 16:28:10 +0100
committerAlberto Gonzalez Iniesta <agi@inittab.org>2012-11-05 16:28:10 +0100
commitd213c4e5576e2fd601679e0d7b2fb1262b807111 (patch)
tree5f0cc82bd0f11fb13b385417604d04c751245a92 /src/openvpn/ssl_verify_openssl.h
parent79c8d3ef7a938f86472e549ef64e1fb820dc80c4 (diff)
parent8dd0350e1607aa30f7a043c8d5ec7a7eeb874115 (diff)
Merge tag 'upstream/2.3_rc1'
Upstream version 2.3_rc1
Diffstat (limited to 'src/openvpn/ssl_verify_openssl.h')
-rw-r--r--src/openvpn/ssl_verify_openssl.h76
1 files changed, 76 insertions, 0 deletions
diff --git a/src/openvpn/ssl_verify_openssl.h b/src/openvpn/ssl_verify_openssl.h
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+++ b/src/openvpn/ssl_verify_openssl.h
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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 OpenSSL backend
+ */
+
+
+#ifndef SSL_VERIFY_OPENSSL_H_
+#define SSL_VERIFY_OPENSSL_H_
+
+#include <openssl/x509.h>
+
+#ifndef __OPENVPN_X509_CERT_T_DECLARED
+#define __OPENVPN_X509_CERT_T_DECLARED
+typedef X509 openvpn_x509_cert_t;
+#endif
+
+/** @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 every time 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 OpenSSL library's \c SSL_CTX_set_verify() 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 preverify_ok - Whether the remote OpenVPN peer's certificate
+ * past verification. A value of 1 means it
+ * verified successfully, 0 means it failed.
+ * @param ctx - The complete context used by the OpenSSL library
+ * to verify the certificate chain.
+ *
+ * @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 (int preverify_ok, X509_STORE_CTX * ctx);
+
+/** @} name Function for authenticating a new connection from a remote OpenVPN peer */
+
+#endif /* SSL_VERIFY_OPENSSL_H_ */