Selva Nair cab48ad43e Accept empty password and/or response in auth-pam plugin
In the auth-pam plugin correctly parse the static challenge string
even when password or challenge response is empty.

Whether an empty user input is an error is determined by the PAM
conversation function depending on whether the PAM module queries
for it or not.

Signed-off-by: Selva Nair <selva.nair@gmail.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1533696271-21799-2-git-send-email-selva.nair@gmail.com>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg17382.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit 7a8109023f4c345fe12f23421c5fa7e88e1ea85b)
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OpenVPN -- A Secure tunneling daemon

Copyright (C) 2002-2018 OpenVPN Inc. 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.

*************************************************************************

To get the latest release of OpenVPN, go to:

	https://openvpn.net/index.php/download/community-downloads.html

To Build and Install,

	tar -zxf openvpn-<version>.tar.gz
	cd openvpn-<version>
	./configure
	make
	make install

or see the file INSTALL for more info.

*************************************************************************

For detailed information on OpenVPN, including examples, see the man page
  http://openvpn.net/man.html

For a sample VPN configuration, see
  http://openvpn.net/howto.html

To report an issue, see
  https://community.openvpn.net/openvpn/report

For a description of OpenVPN's underlying protocol,
  see the file ssl.h included in the source distribution.

*************************************************************************

Other Files & Directories:

* configure.ac -- script to rebuild our configure
  script and makefile.

* sample/sample-scripts/verify-cn

  A sample perl script which can be used with OpenVPN's
  --tls-verify option to provide a customized authentication
  test on embedded X509 certificate fields.

* sample/sample-keys/

  Sample RSA keys and certificates.  DON'T USE THESE FILES
  FOR ANYTHING OTHER THAN TESTING BECAUSE THEY ARE TOTALLY INSECURE.

* sample/sample-config-files/

  A collection of OpenVPN config files and scripts from
  the HOWTO at http://openvpn.net/howto.html

*************************************************************************

Note that easy-rsa and tap-windows are now maintained in their own subprojects.
Their source code is available here:

  https://github.com/OpenVPN/easy-rsa
  https://github.com/OpenVPN/tap-windows

The old cross-compilation environment (domake-win) and the Python-based
buildsystem have been replaced with openvpn-build:

  https://github.com/OpenVPN/openvpn-build

See the INSTALL file for usage information.
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