Configure keystone mappings¶
The following is an example SP mapping configuration for an ADFS IdP:
federated_identities:
- domain: Default
project: fedproject
group: fedgroup
role: _member_
Each IdP trusted by an SP must have the following configuration:
project: The project that federation users have access to. If the project does not already exist, create it in the domain with the name,domain.group: The keystone group that federation users belong. If the group does not already exist, create it in the domain with the name,domain.role: The role that federation users use in that project. Create the role if it does not already exist.domain: The domain where theprojectlives, and where the you assign roles. Create the domain if it does not already exist.
Ansible implements the equivalent of the following OpenStack CLI commands:
# if the domain does not already exist
openstack domain create Default
# if the group does not already exist
openstack group create fedgroup --domain Default
# if the role does not already exist
openstack role create _member_
# if the project does not already exist
openstack project create --domain Default fedproject
# map the role to the project and user group in the domain
openstack role add --project fedproject --group fedgroup _member_
To add more mappings, add options to the list. For example:
federated_identities:
- domain: Default
project: fedproject
group: fedgroup
role: _member_
- domain: Default
project: fedproject2
group: fedgroup2
role: _member_
Keystone federation attribute mapping¶
Attribute mapping adds a set of rules to map federation attributes to keystone users and groups. IdP specifies one mapping per protocol.
Use mapping objects multiple times by different combinations of IdP and protocol.
The details of how the mapping engine works, the schema, and various rule examples are in the keystone developer documentation.
For example, SP attribute mapping configuration for an ADFS IdP:
mapping:
name: adfs-IdP-mapping
rules:
- remote:
- type: upn
local:
- group:
name: fedgroup
domain:
name: Default
- user:
name: '{0}'
attributes:
- name: 'http://schemas.xmlsoap.org/ws/2005/05/identity/claims/upn'
id: upn
Each IdP for an SP needs to be set up with a mapping. This tells the SP how to interpret the attributes provided to the SP from the IdP.
In this example, the IdP publishes the upn attribute. As this
is not in the standard Shibboleth attribute map (see
/etc/shibboleth/attribute-map.xml in the keystone containers), the configuration
of the IdP has extra mapping through the attributes dictionary.
The mapping dictionary is a YAML representation similar to the
keystone mapping property which Ansible uploads. The above mapping
produces the following in keystone.
root@aio1_keystone_container-783aa4c0:~# openstack mapping list
+------------------+
| ID |
+------------------+
| adfs-IdP-mapping |
+------------------+
root@aio1_keystone_container-783aa4c0:~# openstack mapping show adfs-IdP-mapping
+-------+---------------------------------------------------------------------------------------------------------------------------------------+
| Field | Value |
+-------+---------------------------------------------------------------------------------------------------------------------------------------+
| id | adfs-IdP-mapping |
| rules | [{"remote": [{"type": "upn"}], "local": [{"group": {"domain": {"name": "Default"}, "name": "fedgroup"}}, {"user": {"name": "{0}"}}]}] |
+-------+---------------------------------------------------------------------------------------------------------------------------------------+
root@aio1_keystone_container-783aa4c0:~# openstack mapping show adfs-IdP-mapping | awk -F\| '/rules/ {print $3}' | python -mjson.tool
[
{
"remote": [
{
"type": "upn"
}
],
"local": [
{
"group": {
"domain": {
"name": "Default"
},
"name": "fedgroup"
}
},
{
"user": {
"name": "{0}"
}
}
]
}
]
The interpretation of the above mapping rule is that any federation user
authenticated by the IdP maps to an ephemeral (non-existant) user in
keystone. The user is a member of a group named fedgroup. This is
in a domain called Default. The user’s ID and Name (federation uses
the same value for both properties) for all OpenStack services is
the value of upn.
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