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authorBernhard Schmidt <berni@debian.org>2020-09-01 16:53:32 +0200
committerBernhard Schmidt <berni@debian.org>2020-09-01 16:53:32 +0200
commit886dccf631de661ea1b4c8017de98b88b93d7f1c (patch)
tree2f74f9b3f93a35591ffdb305e3e2876cbb9a0c1d /doc/doxygen/doc_control_tls.h
parent9ce71e1c58a83737b045861173254911fda9a76a (diff)
parent57f0b7b331088e489e93ae89ee0aed98381d8806 (diff)
Update upstream source from tag 'upstream/2.5_beta3'
Update to upstream version '2.5~beta3' with Debian dir 08bf4b8b33e73a97458e7fd53ec989aa541745cd
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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) 2010-2018 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; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-/**
- * @file
- * Control Channel TLS module documentation file.
- */
-
-/**
- * @defgroup control_tls Control Channel TLS module
- *
- * This module provides secure encapsulation of control channel messages
- * exchanged between OpenVPN peers.
- *
- * The Control Channel TLS module uses the Transport Layer Security (TLS)
- * protocol to provide an encrypted communication channel between the
- * local OpenVPN process and a remote peer. This protocol simultaneously
- * offers certificate-based authentication of the communicating parties.
- *
- * @par This module's roles
- * The Control Channel TLS module is essential for the security of any
- * OpenVPN-based system. On the one hand, it performs the security
- * operations necessary to protect control channel messages exchanged
- * between OpenVPN peers. On the other hand, before the control and data
- * channels are even setup, it controls the exchange of certificates and
- * verification of the remote's identity during negotiation of VPN
- * tunnels.
- *
- * @par
- * The former role is described below. The latter is described in the
- * documentation for the \c verify_callback() function.
- *
- * @par
- * In other words, this module takes care of the confidentiality and
- * integrity of data channel communications, and the authentication of
- * both the communicating parties and the control channel messages
- * exchanged.
- *
- * @par Initialization and cleanup
- * Because of the one-to-one relationship between control channel TLS
- * state and \c key_state structures, the initialization and cleanup of an
- * instance of the Control Channel TLS module's state happens within the
- * \c key_state_init() and \c key_state_free() functions. In other words,
- * each \c key_state object contains exactly one OpenSSL SSL-BIO object,
- * which is initialized and cleaned up together with the rest of the \c
- * key_state object.
- *
- * @par Packet processing functions
- * This object behaves somewhat like a black box with a ciphertext and a
- * plaintext I/O port. Its interaction with OpenVPN's control channel
- * during operation takes place within the \c tls_process() function of
- * the \link control_processor Control Channel Processor\endlink. The
- * following functions are available for processing packets:
- * - If ciphertext received from the remote peer is available in the \link
- * reliable Reliability Layer\endlink:
- * - Insert it into the ciphertext-side of the SSL-BIO.
- * - Use function: \c key_state_write_ciphertext()
- * - If ciphertext can be extracted from the ciphertext-side of the
- * SSL-BIO:
- * - Pass it to the \link reliable Reliability Layer\endlink for sending
- * to the remote peer.
- * - Use function: \c key_state_read_ciphertext()
- * - If plaintext can be extracted from the plaintext-side of the SSL-BIO:
- * - Pass it on to the \link control_processor Control Channel
- * Processor\endlink for local processing.
- * - Use function: \c key_state_read_plaintext()
- * - If plaintext from the \link control_processor Control Channel
- * Processor\endlink is available to be sent to the remote peer:
- * - Insert it into the plaintext-side of the SSL-BIO.
- * - Use function: \c key_state_write_plaintext() or \c
- * key_state_write_plaintext_const()
- *
- * @par Transport Layer Security protocol implementation
- * This module uses the OpenSSL library's implementation of the TLS
- * protocol in the form of an OpenSSL SSL-BIO object.
- *
- * @par
- * For more information on the OpenSSL library's BIO objects, please see:
- * - OpenSSL's generic BIO objects:
- * http://www.openssl.org/docs/crypto/bio.html
- * - OpenSSL's SSL-BIO object:
- * http://www.openssl.org/docs/crypto/BIO_f_ssl.html
- */