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SSO / OIDC

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SSO / OIDC

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note

SSO is currently only supported on desktop operating systems such as macOS and Windows. Support for iOS and Android, and better support for authenticating via the command line is still to come.



Download and install ZeroTier 1.10.3 or greater on clients that will use SSO.

https://www.zerotier.com/download/




Visit https://my.zerotier.com/account and complete the SSO configuration toward the bottom of the page. You will need your sso provider's Issuer URL as well as a Client ID.



You can configure multiple OIDC clients for your organization, but only one may be used at a time on an individual network.



If you enable this on an existing network, you may accidentally block existing users. Please practice on a test network.



There are three login modes for SSO enabled networks:

Standard - If the user can successfully authenticate to your OIDC provider, they will be allowed access to the ZeroTier network
Email Based Access - The user is allowed to access the network if and only if their email address is in the email list provided by the network administrator.
Group/Role Based Access - The user is allowed to access the network if and only if they are assigned one of the proper roles by the OIDC server.



This is useful for routers, servers, embedded devices, etc… You can do this from the wrench icon in the Members list.





SSO Provider must support PKCE
Requires the following scopes:
openid
profile
email
offline_access
Configure the callback URL to http://localhost:9993/sso





Please ensure the following fields are set on your Auth0 application config:

Application Type: Native
Token Endpoint Authentication Method: None
Allowed Callback URL: http://localhost:9993/sso
Under Advanced Settings -> Grant Types, ensure Authorization Code, and Refresh Token are selected.

note

The OIDC spec is picky about the Issuer URL you enter. It must match what the server configuration metadata endpoint returns.

In the case of Auth0 specifically, Your Issuer URL MUST end with a /. For example, in Auth0's application configuration, show's just the fully qualified domain name. What must be entered in the Issuer field in ZeroTier Central is: https://your-domain-id.auth0.com/



Authelia is a self hosted SSO solution. ZeroTier uses PKCE, so the field secret must be an empty string and public must be true.

note

Use of Authelia requires ZeroTierOne version 1.10.1 or greater. There is an incompatibility between the two in the 1.10.0 release.

Example client configuration:

clients: ## The ID is the OpenID Connect ClientID which is used to link an application to a configuration. - id: authelia-sso-client ## The description to show to users when they end up on the consent screen. Defaults to the ID above. description: zerotier ## The client secret is a shared secret between Authelia and the consumer of this client. secret: "" ## Sector Identifiers are occasionally used to generate pairwise subject identifiers. In most cases this is not ## necessary. Read the documentation for more information. ## The subject identifier must be the host component of a URL, which is a domain name with an optional port. # sector_identifier: example.com ## Sets the client to public. This should typically not be set, please see the documentation for usage. public: true ## The policy to require for this client; one_factor or two_factor. authorization_policy: one_factor ## By default users cannot remember pre-configured consents. Setting this value to a period of time using a ## duration notation will enable users to remember consent for this client. The time configured is the amount ## of time the pre-configured consent is valid for granting new authorizations to the user. # pre_configured_consent_duration: ## Audience this client is allowed to request. audience: [ "authelia-test-client" ] ## Scopes this client is allowed to request. scopes: - openid - groups - email - profile - offline_access ## Redirect URI's specifies a list of valid case-sensitive callbacks for this client. redirect_uris: - http://localhost:9993/sso ## Grant Types configures which grants this client can obtain. ## It's not recommended to define this unless you know what you're doing. grant_types: - refresh_token - authorization_code ## Response Types configures which responses this client can be sent. ## It's not recommended to define this unless you know what you're doing. response_types: - code - id_token ## Response Modes configures which response modes this client supports. response_modes: - form_post - query - fragment ## The algorithm used to sign userinfo endpoint responses for this client, either none or RS256. userinfo_signing_algorithm: none




Navigate to your directory in the Azure portal, and select "App Registrations" in the Manage column.

Click "New Registration"

Set the Name of the application. e.g. "ZeroTier Central SSO"

Under Redirect URI:

Platform: Public client/native (mobile & desktop)

Set the Redirect URI to http://localhost:9993/sso



Once your app registration is configured, open the "Endpoints" tab. Look for "OpenID Connect Metadata Document".



The Issuer URL is everything up to /.well-known/openid-configuration. For example https://login.microsoftonline.com/00000000-0000-0000-0000-000000000000/v2.0. Do not use a trailing / when you enter the "issuer" url in Central.



Google OAuth2/OIDC is not supported as Google does not support PKCE clients at this time. You can, however, use Keycloak as a SAML Identity Broker with Google Workspace.



Log into your Keycloak administration console, go to the Client configuration and create a new client. Configuration is fairly straightforward, with the following requirements:

Client Protocol: openid-connect
Access Type: public
Standard Flow Enabled: ON
Root URL: https://my.zerotier.com
Valid Redirect URLS
https://my.zerotier.com/
http://localhost/sso
Admin URL: https://my.zerotier.com
Web Origins:

See here for full documentation for configuring OpenID Connect clients with Keycloak.



If you have a SAML provider, but not an OpenID Connect provider, Keycloak can also be used to bridge the gap. On your keycloak Admin page, go to Identity Providers. From the dropdown, select SAML v2.0 and create the connection to your SAML provider. Combined with the general Keycloak OIDC client settings above, you now have an OIDC server that authenticates against your SAML provider.



Application Type: Native
Token Endpoint Authentication Method: None
Allowed Callback URL: http://localhost:9993/sso
Under Advanced Settings -> Grant Types, ensure Implicit, Authorization Code, and Refresh Token are selected.



note

OneLogin requires ZeroTier One v1.10.3+

Log in to your OneLogin admin console. Select "Custom Connectors" from the "Applications" menu. Hit the "New Connector" button. Name your connector, set Sign on method to OpenID Connect, and set the Redirect URI to https://localhost:9993/sso. Finally, back on the on Custom Connectors page, hit the "Add App to Connector" link. Adjust the description & logo settings as you see fit, and then save.

Once the above steps are complete, go to the SSO tab for your new OneLogin Application. Set "Application Type" to "Native", and "Token Endpoint" to "None (PKCE)". You'll also find the required Client ID and Issuer URLs to enter into https://my.zerotier.com/account.

Customizing the Final SSO Flow Page[​](#customizing-the-final-sso-flow-page "Direct link to Customizing the Final SSO Flow Page")



If you wish, you can customize the final view of the sso login process. Create the file $ZEROTIER_HOME/sso-auth.template.html.

Note: Any CSS or images must be hosted externally, or placed within the single HTML page itself.

You may customize the page to look however you wish. At this time there are only two template values set by zerotier:

networkId
messageText

Templates must be valid HTML, and the template values must be placed inside {{ ... }} blocks like so:

{{ networkId }}{{ messageText }}


You may react to errors via the isError variable:

{% if isError %}{{ messageText }}{% else %}{{ messageText }}{% endif %}




With Email based network access, a network administrator can limit access to the network to only users whose email addresses are present in the list specified by the network administrator.





Configuring Role Based Access controls is different across all of the different OIDC providers available. We'll give examples for many of the large ones.

Role/group names are up to the network administrator. Simply add one or more role name to your network configuration, and users will be required to have at least one of those roles assigned in order to access the network.



Auth0 requires multiple steps to configure.



Log into your auth0.com management console. Go to User Management and select roles. Hit the + Create Role button in the upper right corner. Give your new role a name & description of your choosing.



Once the new role is created, go to the Users tab. There you will be able to add the users you wish to have access to the role.



In order for ZeroTier to be able to read the roles a user has been assigned, they must be added to the ID and Access tokens, and mapped to the correct name. In the Auth0.com dashboard, go to Actions, and select Flows. Click the Login flow. On the right side of the screen, hit the + next to Add Action and select Build Custom. Give the action a name such as "Attach ZeroTier Roles" with Trigger set to "Login/Post Login" and Runtime set to "Node 16" (or whatever the latest default is).

Next you will get a screen with a code editor. Delete everything in the buffer and add the following:

exports.onExecutePostLogin = async (event, api) => { const namespace = "https://my.zerotier.com"; if (event.authorization) { api.idToken.setCustomClaim(`${namespace}/roles`, event.authorization.roles); api.accessToken.setCustomClaim(`${namespace}/roles`, event.authorization.roles); }}


note

Auth0 requires roles to be in a namespaced name. To properly integrate with ZeroTier Central, the final claim name set on the token via the script above must be https://my.zerotier.com/roles. Please enter the login script exactly as shown above to reduce the chances of errors.

Once it is entered, hit Deploy on the upper right hand side of the screen.

Hit the <- Back to flow link, which will take you back to the Login Flow graph. Under Add Action, select Custom. You'll find your new action listed there. Drag it between Start and Complete in the login flow and click Apply. When finished, your flow will look something like this:



Your users' assigned roles will now be attached to the tokens required to authorize a user on your ZeroTier networks.



https://learn.microsoft.com/en-us/azure/active-directory/develop/howto-add-app-roles-in-azure-ad-apps



In the Azure portal, go to Azure Active Directory and select App Registrations. Select the app you've created for integration with ZeroTier Central. In the Manage menu, select App Roles, and then create a new app role and hit Apply



The Value field is what you use as the role name in the network configuration on https://my.zerotier.com



Go back to Azure Active Directory in the Azure portal. Select Enterprise Applications from the list of options on the side of the screen. Select the app to be used for ZeroTier Central integration.

Select Users and Groups from the Manage menu. Select all of the users you want to assign the App Role and select Edit Assignment. Click on the area of the screen that says "Select a Role", then find your newly created app role from step 1, click it and hit the Select button.



Okta doesn't have the concept of Roles, but it does have Groups that can be used for the same purpose when authenticating to a ZeroTier network.

note

Okta role/group based access requires ZeroTier One version 1.10.3+



From your Okta administrator dashboard, go to Directory and select Groups. Create a group with the name of your choice. Once created, assign people to the group that you want to have access to your ZeroTier network.



In the Okta administrator dashboard, go to Applications and open the configuration for the Okta Application you've configured for use with ZeroTier. Click the 'Edit' button in the "OpenID Connect ID Token" box. Set "Group claim type" to "Filter", and set the three fields for "Group claim filter" to roles, Matches regex, and .*.



It is possible to limit the groups to only certain groups. See Okta's group filter documentation for more information.



Coming Soon

Updated on: 12/07/2024

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