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Update YubiKey_and_OpenVPN_via_PAM.adoc

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Henrik Stråth 2014-10-29 17:15:58 +01:00
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doc/YubiKey_and_OpenVPN_via_PAM.adoc
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@ -1,11 +1,9 @@
Introduction
------------
== Introduction
The purpose of this document is to guide readers through the configuration steps to use two factor authentication for OpenVPN using YubiKey. This document assumes that the reader has advanced knowledge and experience in Linux system administration, particularly for how PAM authentication mechanism is configured on a Linux platform.
Prerequisites
-------------
== Prerequisites
Successful configuration of the Yubico PAM module to support two factor authentication for OpenVPN has the following prerequisites:
@ -18,12 +16,11 @@ http://openvpn.net/index.php/downloads.html[OpenVPN]:: Version 2.0.9.
http://freeradius.org/download.html[FreeRADIUS]: Version 1.1.7 or later.
Pam_Radius:: ftp://ftp.freeradius.org/pub/radius/pam_radius-1.3.17.tar.gz[Version 1.3.17].
Configuration
-------------
== Configuration
There are two ways OpenVPN can be configured to support two factor authentication with YubiKey.
A) OpenVPN Configuration without FreeRADIUS support:
----------------------------------------------------
=== OpenVPN Configuration without FreeRADIUS support:
In this mode of configuration, OpenVPN server will be authenticating users
by verifying username and user’s password against system password file
@ -32,8 +29,7 @@ against Yubico's OTP validation server.
We assume that OpenVPN server is already installed on the server.
a) Configuration of OpenVPN server to support PAM authentication:
-----------------------------------------------------------------
==== Configuration of OpenVPN server to support PAM authentication:
* Edit the OpenVPN server configuration file `/etc/openvpn/server.conf`
to add the following three lines to enable PAM modules for username
@ -55,21 +51,18 @@ username-as-common-name
auth-user-pass
b) Installation of pam_yubico module:
-------------------------------------
==== Installation of pam_yubico module:
Build instructions for pam_yubico are available in its README.
c) Configuration of pam_yubico module:
--------------------------------------
==== Configuration of pam_yubico module:
*) Configuration for user and YubiKey PublicID mapping
There are two ways of user and YubiKey PublicID (token ID) mapping.
It can be either done at administrative level or at individual user level.
Administrative Level
--------------------
===== Administrative Level
In Administrative level, system administrators hold right to configure
the user and YubiKey PublicID mapping. Administrators can achieve this
@ -105,8 +98,7 @@ The mapping file must be created/updated manually before configuration
of Yubico PAM module for OpenVPN authentication.
Configuration of modified pam_yubico.so module at administrative level:
-----------------------------------------------------------------------
====== Configuration of modified pam_yubico.so module at administrative level:
Append the following line to the beginning of /etc/pam.d/radiusd file:
@ -129,23 +121,20 @@ After successful verification of OTP Yubico PAM module from the Yubico
authentication server, a success code is returned.
User Level:
-----------
===== User Level
Although, user level configuration of pam_yubico is possible, this might
not be a desired configuration option in case of OpenVPN daemon in most
enterprise.
ii) Configuration of PAM modules for OpenVPN:
---------------------------------------------
To configure PAM modules for OpenVPN, create a file named
`/etc/pam.d/openvpn` (file name must be one which is specified
in `/etc/openvpn/server.conf` along with 'plugin' directive)
and list all the PAM modules in this files accordingly.
d) Test Setup:
--------------
==== Test Setup
Our test environment is as follows:
@ -166,8 +155,7 @@ password include system-auth
session include system-auth
------
e) Testing the configuration:
-----------------------------
==== Testing the configuration
We have tested the pam_yubico configuration on following Linux sever platforms:
@ -213,8 +201,7 @@ follows instead of starting it using `init.d` script:
We can configure OpenVPN server demon to start at boot time by
copying the above command in `/etc/rc.local` file.
B) OpenVPN Configuration with FreeRADIUS support:
-------------------------------------------------
=== OpenVPN Configuration with FreeRADIUS support
In this type of configuration, the OpenVPN server will be using
FreeRADIUS server for authenticating users. FreeRADIUS server will
@ -263,8 +250,7 @@ freeradius.example.com Admin456
We can configure failover support for RADIUS server by creating additional
RADIUS server entries per line of “/etc/raddb/server” file.
A) Test Setup:
--------------
==== Test Setup
Our test environment is as follows:
@ -280,8 +266,7 @@ account required pam_radius_auth.so
auth required pam_radius_auth.so no_warn try_first_pass
------
B) Testing the configuration:
-----------------------------
==== Testing the configuration
We have tested the pam_yubico configuration on following Linux sever platforms: