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keystone/doc/source/admin/identity-use-trusts.rst
Samriddhi Jain aba9267323 Added keystone admin guides to documentation 
Currently the identity administrator guide docs are a part of
general OpenStack-manuals. Migrating those docs to keystone
documentation so that they can be reviewed effectively by
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Depends-On: Ia750cb049c0f53a234ea70ce1f2bbbb7a2aa9454

Change-Id: Id121ae1dd5bce993b4ad1219b592527ef0047063
2017-06-24 00:42:14 +05:30

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Use trusts

OpenStack Identity manages authentication and authorization. A trust is an OpenStack Identity extension that enables delegation and, optionally, impersonation through keystone. A trust extension defines a relationship between:

Trustor

The user delegating a limited set of their own rights to another user.

Trustee

The user trust is being delegated to, for a limited time.

The trust can eventually allow the trustee to impersonate the trustor. For security reasons, some safeties are added. For example, if a trustor loses a given role, any trusts the user issued with that role, and the related tokens, are automatically revoked.

The delegation parameters are:

User ID

The user IDs for the trustor and trustee.

Privileges

The delegated privileges are a combination of a project ID and a number of roles that must be a subset of the roles assigned to the trustor.

If you omit all privileges, nothing is delegated. You cannot delegate everything.

Delegation depth

Defines whether or not the delegation is recursive. If it is recursive, defines the delegation chain length.

Specify one of the following values:

  • 0. The delegate cannot delegate these permissions further.
  • 1. The delegate can delegate the permissions to any set of delegates but the latter cannot delegate further.
  • inf. The delegation is infinitely recursive.
Endpoints

A list of endpoints associated with the delegation.

This parameter further restricts the delegation to the specified endpoints only. If you omit the endpoints, the delegation is useless. A special value of all_endpoints allows the trust to be used by all endpoints associated with the delegated project.

Duration

(Optional) Comprised of the start time and end time for the trust.