Role-Based Access Control (RBAC)¶
The Role-Based Access Control (RBAC) policy framework enables both operators and users to grant access to resources for specific projects.
Supported objects for sharing with specific projects¶
Currently, the access that can be granted using this feature is supported by:
- Regular port creation permissions on networks (since Liberty).
- Binding QoS policies permissions to networks or ports (since Mitaka).
- Attaching router gateways to networks (since Mitaka).
Sharing an object with specific projects¶
Sharing an object with a specific project is accomplished by creating
a policy entry that permits the target project the access_as_shared
action on that object.
Sharing a network with specific projects¶
Create a network to share:
$ openstack network create secret_network
+---------------------------+--------------------------------------+
| Field | Value |
+---------------------------+--------------------------------------+
| admin_state_up | UP |
| availability_zone_hints | |
| availability_zones | |
| created_at | 2017-01-25T20:16:40Z |
| description | |
| dns_domain | None |
| id | f55961b9-3eb8-42eb-ac96-b97038b568de |
| ipv4_address_scope | None |
| ipv6_address_scope | None |
| is_default | None |
| mtu | 1450 |
| name | secret_network |
| port_security_enabled | True |
| project_id | 61b7eba037fd41f29cfba757c010faff |
| provider:network_type | vxlan |
| provider:physical_network | None |
| provider:segmentation_id | 9 |
| qos_policy_id | None |
| revision_number | 3 |
| router:external | Internal |
| segments | None |
| shared | False |
| status | ACTIVE |
| subnets | |
| tags | [] |
| updated_at | 2017-01-25T20:16:40Z |
+---------------------------+--------------------------------------+
Create the policy entry using the openstack network rbac create
command (in this example, the ID of the project we want to share with is
b87b2fc13e0248a4a031d38e06dc191d):
$ openstack network rbac create --target-project \
b87b2fc13e0248a4a031d38e06dc191d --action access_as_shared \
--type network f55961b9-3eb8-42eb-ac96-b97038b568de
+-------------------+--------------------------------------+
| Field | Value |
+-------------------+--------------------------------------+
| action | access_as_shared |
| id | f93efdbf-f1e0-41d2-b093-8328959d469e |
| name | None |
| object_id | f55961b9-3eb8-42eb-ac96-b97038b568de |
| object_type | network |
| project_id | 61b7eba037fd41f29cfba757c010faff |
| target_project_id | b87b2fc13e0248a4a031d38e06dc191d |
+-------------------+--------------------------------------+
The target-project parameter specifies the project that requires
access to the network. The action parameter specifies what
the project is allowed to do. The type parameter says
that the target object is a network. The final parameter is the ID of
the network we are granting access to.
Project b87b2fc13e0248a4a031d38e06dc191d will now be able to see
the network when running openstack network list and
openstack network show and will also be able to create ports
on that network. No other users (other than admins and the owner)
will be able to see the network.
Note
Subnets inherit the RBAC policy entries of their network.
To remove access for that project, delete the policy that allows it using the openstack network rbac delete command:
$ openstack network rbac delete f93efdbf-f1e0-41d2-b093-8328959d469e
If that project has ports on the network, the server will prevent the policy from being deleted until the ports have been deleted:
$ openstack network rbac delete f93efdbf-f1e0-41d2-b093-8328959d469e
RBAC policy on object f93efdbf-f1e0-41d2-b093-8328959d469e
cannot be removed because other objects depend on it.
This process can be repeated any number of times to share a network with an arbitrary number of projects.
Sharing a QoS policy with specific projects¶
Create a QoS policy to share:
$ openstack network qos policy create secret_policy
+-------------------+--------------------------------------+
| Field | Value |
+-------------------+--------------------------------------+
| description | |
| id | 1f730d69-1c45-4ade-a8f2-89070ac4f046 |
| name | secret_policy |
| project_id | 61b7eba037fd41f29cfba757c010faff |
| revision_number | 1 |
| rules | [] |
| shared | False |
| tags | [] |
+-------------------+--------------------------------------+
Create the RBAC policy entry using the openstack network rbac create
command (in this example, the ID of the project we want to share with is
be98b82f8fdf46b696e9e01cebc33fd9):
$ openstack network rbac create --target-project \
be98b82f8fdf46b696e9e01cebc33fd9 --action access_as_shared \
--type qos_policy 1f730d69-1c45-4ade-a8f2-89070ac4f046
+-------------------+--------------------------------------+
| Field | Value |
+-------------------+--------------------------------------+
| action | access_as_shared |
| id | 8828e38d-a0df-4c78-963b-e5f215d3d550 |
| name | None |
| object_id | 1f730d69-1c45-4ade-a8f2-89070ac4f046 |
| object_type | qos_policy |
| project_id | 61b7eba037fd41f29cfba757c010faff |
| target_project_id | be98b82f8fdf46b696e9e01cebc33fd9 |
+-------------------+--------------------------------------+
The target-project parameter specifies the project that requires
access to the QoS policy. The action parameter specifies what
the project is allowed to do. The type parameter says
that the target object is a QoS policy. The final parameter is the ID of
the QoS policy we are granting access to.
Project be98b82f8fdf46b696e9e01cebc33fd9 will now be able to see
the QoS policy when running openstack network qos policy list and
openstack network qos policy show and will also be able to bind
it to its ports or networks. No other users (other than admins and the owner)
will be able to see the QoS policy.
To remove access for that project, delete the RBAC policy that allows it using the openstack network rbac delete command:
$ openstack network rbac delete 8828e38d-a0df-4c78-963b-e5f215d3d550
If that project has ports or networks with the QoS policy applied to them, the server will not delete the RBAC policy until the QoS policy is no longer in use:
$ openstack network rbac delete 8828e38d-a0df-4c78-963b-e5f215d3d550
RBAC policy on object 8828e38d-a0df-4c78-963b-e5f215d3d550
cannot be removed because other objects depend on it.
This process can be repeated any number of times to share a qos-policy with an arbitrary number of projects.
Allowing a network to be used as an external network¶
To make a network available as an external network for specific projects
rather than all projects, use the access_as_external action.
Create a network that you want to be available as an external network:
$ openstack network create secret_external_network +---------------------------+--------------------------------------+ | Field | Value | +---------------------------+--------------------------------------+ | admin_state_up | UP | | availability_zone_hints | | | availability_zones | | | created_at | 2017-01-25T20:36:59Z | | description | | | dns_domain | None | | id | 802d4e9e-4649-43e6-9ee2-8d052a880cfb | | ipv4_address_scope | None | | ipv6_address_scope | None | | is_default | None | | mtu | 1450 | | name | secret_external_network | | port_security_enabled | True | | project_id | 61b7eba037fd41f29cfba757c010faff | | proider:network_type | vxlan | | provider:physical_network | None | | provider:segmentation_id | 21 | | qos_policy_id | None | | revision_number | 3 | | router:external | Internal | | segments | None | | shared | False | | status | ACTIVE | | subnets | | | tags | [] | | updated_at | 2017-01-25T20:36:59Z | +---------------------------+--------------------------------------+
Create a policy entry using the openstack network rbac create command (in this example, the ID of the project we want to share with is
838030a7bf3c4d04b4b054c0f0b2b17c):$ openstack network rbac create --target-project \ 838030a7bf3c4d04b4b054c0f0b2b17c --action access_as_external \ --type network 802d4e9e-4649-43e6-9ee2-8d052a880cfb +-------------------+--------------------------------------+ | Field | Value | +-------------------+--------------------------------------+ | action | access_as_external | | id | afdd5b8d-b6f5-4a15-9817-5231434057be | | name | None | | object_id | 802d4e9e-4649-43e6-9ee2-8d052a880cfb | | object_type | network | | project_id | 61b7eba037fd41f29cfba757c010faff | | target_project_id | 838030a7bf3c4d04b4b054c0f0b2b17c | +-------------------+--------------------------------------+
The target-project parameter specifies the project that requires
access to the network. The action parameter specifies what
the project is allowed to do. The type parameter indicates
that the target object is a network. The final parameter is the ID of
the network we are granting external access to.
Now project 838030a7bf3c4d04b4b054c0f0b2b17c is able to see
the network when running openstack network list
and openstack network show and can attach router gateway
ports to that network. No other users (other than admins
and the owner) are able to see the network.
To remove access for that project, delete the policy that allows it using the openstack network rbac delete command:
$ openstack network rbac delete afdd5b8d-b6f5-4a15-9817-5231434057be
If that project has router gateway ports attached to that network, the server prevents the policy from being deleted until the ports have been deleted:
$ openstack network rbac delete afdd5b8d-b6f5-4a15-9817-5231434057be
RBAC policy on object afdd5b8d-b6f5-4a15-9817-5231434057be
cannot be removed because other objects depend on it.
This process can be repeated any number of times to make a network available as external to an arbitrary number of projects.
If a network is marked as external during creation, it now implicitly creates a wildcard RBAC policy granting everyone access to preserve previous behavior before this feature was added.
$ openstack network create global_external_network --external
+---------------------------+--------------------------------------+
| Field | Value |
+---------------------------+--------------------------------------+
| admin_state_up | UP |
| availability_zone_hints | |
| availability_zones | |
| created_at | 2017-01-25T20:41:44Z |
| description | |
| dns_domain | None |
| id | 72a257a2-a56e-4ac7-880f-94a4233abec6 |
| ipv4_address_scope | None |
| ipv6_address_scope | None |
| is_default | None |
| mtu | 1450 |
| name | global_external_network |
| port_security_enabled | True |
| project_id | 61b7eba037fd41f29cfba757c010faff |
| provider:network_type | vxlan |
| provider:physical_network | None |
| provider:segmentation_id | 69 |
| qos_policy_id | None |
| revision_number | 4 |
| router:external | External |
| segments | None |
| shared | False |
| status | ACTIVE |
| subnets | |
| tags | [] |
| updated_at | 2017-01-25T20:41:44Z |
+---------------------------+--------------------------------------+
In the output above the standard router:external attribute is
External as expected. Now a wildcard policy is visible in the
RBAC policy listings:
$ openstack network rbac list --long -c ID -c Action
+--------------------------------------+--------------------+
| ID | Action |
+--------------------------------------+--------------------+
| b694e541-bdca-480d-94ec-eda59ab7d71a | access_as_external |
+--------------------------------------+--------------------+
You can modify or delete this policy with the same constraints
as any other RBAC access_as_external policy.
Preventing regular users from sharing objects with each other¶
The default policy.json file will not allow regular
users to share objects with every other project using a wildcard;
however, it will allow them to share objects with specific project
IDs.
If an operator wants to prevent normal users from doing this, the
"create_rbac_policy": entry in policy.json can be adjusted
from "" to "rule:admin_only".
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