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Active Directory / LDAP Access Management

MinIO supports using an Active Directory or LDAP (AD/LDAP) service for external management of user identities.

For identities managed by the external AD/LDAP provider, MinIO uses the user’s Distinguished Name and attempts to map it against an existing policy.

If the AD/LDAP configuration includes the necessary settings to query the user’s AD/LDAP group membership, MinIO also uses those group Distinguished Names and attempts to map each against an existing policy.

MinIO by default denies access to all actions or resources not explicitly allowed by a user’s assigned or inherited policies. Users managed by an AD/LDAP provider must specify the necessary policies as part of the user profile data. If no policies match either the user DN or group DNs, MinIO blocks all access to actions and resources on the deployment.

The specific AD/LDAP queries MinIO issues to authenticate the user and retrieve it’s group membership are configured as part of deploying the cluster with Active Directory / LDAP identity management. This page covers creation of MinIO policies to match the possible returned Distinguished Names.

Authentication and Authorization Flow

The login flow for an application using Active Directory / LDAP credentials is as follows:

  1. Specify the AD/LDAP credentials to the MinIO Security Token Service (STS) AssumeRoleWithLDAPIdentity API endpoint.

  2. MinIO verifies the provided credentials against the AD/LDAP server.

  3. MinIO checks for any policy whose name matches the user Distinguished Name (DN) and assigns that policy to the authenticated user.

    If configured to perform group queries, MinIO also queries for a list of AD/LDAP groups in which the user has membership. MinIO checks for any policy whose name matches a returned group DN and assigns that policy to the authenticated user.

  4. MinIO returns temporary credentials in the STS API response in the form of an access key, secret key, and session token. The credentials have permissions matching those policies whose name matches either the authenticated user DN or a group DN.

MinIO provides an example Go application ldap.go that handles the full login flow.

AD/LDAP users can alternatively create service accounts associated to their AD/LDAP user Distinguished Name. Service accounts are long-lived credentials which inherit their privileges from the parent user. The parent user can further restrict those privileges while creating the service account. Use either of the following methods to create a new service account

  • Log into the MinIO Console using the AD/LDAP-managed user credentials. From the Identity section of the left navigation, select Service Accounts followed by the Create service account + button.

  • Use the mc admin user svcacct add command to create the service account. Specify the user Distinguished Name as the username to which to associate the service account.

Mapping Policies to User DN

Consider the following policy assignments:

mc admin policy set --consoleAdmin user='cn=sisko,cn=users,dc=example,dc=com'
mc admin policy set --readwrite,diagnostics user='cn=dax,cn=users,dc=example,dc=com'
  • MinIO would assign an authenticated user with DN matching cn=sisko,cn=users,dc=example,dc=com the consoleAdmin policy, granting complete access to the MinIO server.

  • MinIO would assign an authenticated user with DN matching cn=dax,cn=users,dc=example,dc=com both the readwrite and diagnostics policies, granting general read/write access to the MinIO server and access to diagnostic administrative operations.

  • MinIO would assign no policies to an authenticated user with DN matching cn=quark,cn=users,dc=example,dc=com and deny all access to API operations.

Mapping Policies to Group DN

Consider the following policy assignments:

mc admin policy set --consoleAdmin group='cn=ops,cn=groups,dc=example,dc=com'
mc admin policy set --diagnostics group='cn=engineering,cn=groups,dc=example,dc=com'
  • MinIO would assign any authenticating user with membership in the cn=ops,cn=groups,dc=example,dc=com AD/LDAP group the consoleAdmin policy, granting complete access to the MinIO server.

  • MinIO would assign any authenticating user with membership in the cn=engineering,cn=groups,dc=example,dc=com AD/LDAP group the diagnostics policy, granting access to diagnostic administrative operations.