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57 lines
1.8 KiB
ReStructuredText
57 lines
1.8 KiB
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=========================
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Two-factor authentication
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=========================
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.. image:: images/two_factor_authentication.png
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:width: 100%
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Two-factor authentication also known as 2FA or 2-Step Verification is an authentication
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method that requires two components, such as a pin/password + a token.
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OPNsense (version >=16.1.14) offers support for Two-factor authentication throughout
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the entire system, with one exception being console/ssh access.
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Supported services are:
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* OPNsense Graphical User Interface
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* Captive Portal
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* Virtual Private Networking - OpenVPN & IPsec
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* Caching Proxy
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--------------------------
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GUI Fallback Configuration
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--------------------------
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To prevent GUI lockout due to unavailable remote authentication server, the system
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has a default fallback to the local database. In case of 2FA for the GUI one needs
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to disable the fallback option to make sure no local user can gain access without 2FA.
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.. image:: images/auth_server_fallback.png
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:width: 100%
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----------------------------
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Time-based One-time Password
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----------------------------
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TOTP is an algorithm that computes a one-time password from a shared secret key
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and the current time. OPNsense supports RFC 6238.
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--------------------
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Google Authenticator
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--------------------
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OPNsense fully supports the use of Google's Authenticator application.
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This application can generate tokens on Android, iOS and BlackBerry OS.
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The usage of this application is free and very simple to setup using OPNsense.
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-----------------
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Other TOTP tokens
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-----------------
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The 2FA feature can be used with any time based one-time password token, although
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it may be necessary to convert the tokens seed to the used format (base32).
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---------------------
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Configuration & Setup
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---------------------
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To setup see: :doc:`how-tos/two_factor`.
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