RADIUS Provider

You can configure a Radius provider for applications that don't support any other protocols or that require Radius.

info

This provider requires the deployment of the RADIUS outpost

Currently, only authentication requests are supported.

Authentication flow

Authentication requests against the Radius Server use a flow in the background. This allows you to use the same flows, stages, and policies as you do for web-based logins.

The following stages are supported:

• Identification

• Password

• Authenticator validation

  Note: Authenticator validation currently only supports DUO, TOTP, and static authenticators.

  For code-based authenticators, the code must be given as part of the bind password, separated by a semicolon. For example for the password example-password and the MFA token 123456, the input must be example-password;123456.

  SMS-based authenticators are not supported because they require a code to be sent from authentik, which is not possible during the bind.

• User Logout

• User Login

• Deny

• Mutual TLS stage

EAP

authentik: 2025.10.0+ Enterprise

authentik supports EAP with TLS as the inner protocol. To set this up, a certificate authority needs to be available and client certificates need to be installed on machines, the configuration of which is outside of the scope of this document.

EAP-TLS

Create an authentication flow with a Mutual TLS stage as its first stage. This stage should be configured to use your certificate authority. Afterwards a certificate needs to be generated for the RADIUS outpost, which can be configured in the RADIUS provider. Once the certificate and the authentication flow are configured in the provider, authentication via EAP-TLS is possible.

RADIUS attributes

Starting with authentik 2024.8, you can create RADIUS provider property mappings, which make it possible to add custom attributes to the RADIUS response packets.

For example, to add the Cisco AV-Pair attribute, this snippet can be used:

define_attribute(
    vendor_code=9,
    vendor_name="Cisco",
    attribute_name="AV-Pair",
    attribute_code=1,
    attribute_type="string",
)
packet["Cisco-AV-Pair"] = "shell:priv-lvl=15"
return packet

After creation, make sure to select the RADIUS property mapping in the RADIUS provider.

Limitations

The RADIUS provider only supports the PAP (Password Authentication Protocol) protocol:

	Cleartext	NT	MD5	Salted MD5	SHA1	Salted SHA1	Unix Crypt
PAP	✓	✓	✓	✓	✓	✓	✓
CHAP	✓	✗	✗	✗	✗	✗	✗
Digest	✓	✗	✗	✗	✗	✗	✗
MS-CHAP	✓	✓	✗	✗	✗	✗	✗
PEAP	✓	✓	✗	✗	✗	✗	✗
MS-CHAPv2	✓	✓	✗	✗	✗	✗	✗
Cisco LEAP	✓	✓	✗	✗	✗	✗	✗
EAP-GTC	✓	✓	✓	✓	✓	✓	✓
EAP-MD5	✓	✗	✗	✗	✗	✗	✗
EAP-PWD	✓	✗	✗	✗	✗	✓	✓