> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/gridgain/gridgain-8/security/authentication-and-authorization.md).

# Authentication and Authorization

Control who can connect to a GridGain cluster and what they may do — authentication mechanisms, permission-based authorization, custom authenticators, and multi-tenant isolation.

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[Authentication](/docs/gridgain/gridgain-8/security/authentication-and-authorization/authentication.md)
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Configure authentication for a GridGain cluster: Ignite passcode, GridGain passcode, certificate, JAAS, composite, Control Center OpenID, and LDAP/AD authentication.
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[Authorization and Permissions](/docs/gridgain/gridgain-8/security/authentication-and-authorization/authorization-permissions.md)
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GridGain authorization: the permission string format, the defaultAllow property, the full list of supported permissions, and how to scope them.
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[Implementing Custom Authenticator](/docs/gridgain/gridgain-8/security/authentication-and-authorization/custom-authenticators.md)
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Implement a custom GridGain authenticator, illustrated with a file-based ACL provider for PasscodeAuthenticator.
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[Multi-Tenancy](/docs/gridgain/gridgain-8/security/authentication-and-authorization/multi-tenancy.md)
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Isolate tenant data in GridGain by creating per-tenant caches and assigning per-cache security permissions.
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