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Set Up External Authentication

This document describes how to use an external identity provider such as an LDAP service or Active Directory service on KubeSphere.

KubeSphere provides a built-in OAuth server. Users can obtain OAuth access tokens to authenticate themselves to the KubeSphere API. As a KubeSphere administrator, you can edit ks-installer of the CRD ClusterConfiguration to configure OAuth and specify identity providers.

Prerequisites

You need to deploy a Kubernetes cluster and install KubeSphere in the cluster. For details, see Installing on Linux and Installing on Kubernetes.

Procedure

Log in to KubeSphere as admin, move the cursor to in the lower-right corner, click kubectl, and run the following command to edit ks-installer of the CRD ClusterConfiguration:
```
kubectl -n kubesphere-system edit cc ks-installer
```
Add the following fields under spec.authentication.jwtSecret.

Example:
```
spec:
  authentication:
    jwtSecret: ''
    authenticateRateLimiterMaxTries: 10
    authenticateRateLimiterDuration: 10m0s
    loginHistoryRetentionPeriod: 168h
    maximumClockSkew: 10s
    multipleLogin: true
    oauthOptions:
      accessTokenMaxAge: 1h
      accessTokenInactivityTimeout: 30m
      identityProviders:
      - name: LDAP
        type: LDAPIdentityProvider
        mappingMethod: auto
        provider:
          host: 192.168.0.2:389
          managerDN: uid=root,cn=users,dc=nas
          managerPassword: ********
          userSearchBase: cn=users,dc=nas
          loginAttribute: uid
          mailAttribute: mail
```
The fields are described as follows:
- jwtSecret: Secret used to sign user tokens. In a multi-cluster environment, all clusters must use the same Secret.
- authenticateRateLimiterMaxTries: Maximum number of consecutive login failures allowed during a period specified by authenticateRateLimiterDuration. If the number of consecutive login failures of a user reaches the limit, the user will be blocked.
- authenticateRateLimiterDuration: Period during which authenticateRateLimiterMaxTries applies.
- loginHistoryRetentionPeriod: Retention period of login records. Outdated login records are automatically deleted.
- maximumClockSkew: Maximum clock skew for time-sensitive operations such as token expiration validation. The default value is 10s.
- multipleLogin: Whether multiple users are allowed to log in from different locations. The default value is true.
- oauthOptions: OAuth settings.
  - accessTokenMaxAge: Access token lifetime. For member clusters in a multi-cluster environment, the default value is 0h, which means access tokens never expire. For other clusters, the default value is 2h.
  - accessTokenInactivityTimeout: Access token inactivity timeout period. An access token becomes invalid after it is idle for a period specified by this field. After an access token times out, the user needs to obtain a new access token to regain access.
  - identityProviders: Identity providers.
    - name: Identity provider name.
    - type: Identity provider type.
    - mappingMethod: Account mapping method. The value can be auto or lookup.
      - If the value is auto (default), you need to specify a new username. KubeSphere automatically creates a user according to the username and maps the user to a third-party account.
      - If the value is lookup, you need to perform step 3 to manually map an existing KubeSphere user to a third-party account.
    - provider: Identity provider information. Fields in this section vary according to the identity provider type.

If mappingMethod is set to lookup, run the following command and add the labels to map a KubeSphere user to a third-party account. Skip this step if mappingMethod is set to auto.

kubectl edit user <KubeSphere username>

labels:
  iam.kubesphere.io/identify-provider: <Identity provider name>
  iam.kubesphere.io/origin-uid: <Third-party username>

After the fields are configured, save your changes, and wait until the restart of ks-installer is complete.

Note

In a multi-cluster environment, you only need to configure the host cluster.

Identity provider

You can configure multiple identity providers (IdPs) in the 'identityProviders' section. The identity provider authenticates the user and provides an identity token to kubesphere.

Kubesphere provides the following types of identity providers by default:

You can also expand the kubesphere OAuth2 authentication plug-in to integrate with your account system.

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