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analytics-rbac.md

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1. Introduction

Analytics API RBAC provides ability to access UVE and query information based on the permissions of the user for the UVE or queried object.

2. Problem statement

Currently Analytics API supports authenticated access for cloud-admin role. However to display network monitoring for tenant pages in the UI, analytics API needs to support RBAC similar to config API so that the tenants can only view information about the networks for which they have the read permissions.

3. Proposed solution

Analytics API will map query and UVE objects to configuration objects on which RBAC rules are applied so that read permissions can be verified using VNC API. Following steps will be needed:

  1. For statistics queries, annotations will be added to sandesh file so that indices/tags on statistics queries can be associated with objects/UVEs. These can then be added to the schema and used by contrail-analytics-api to determine the object level read permissions.
  2. For flow and log queries, we will evaluate the object read permissions for each AND term in the where query.
  3. For UVEs list queries (e.g. analytics/uve/virtual-networks/), contrail-analytics-api will get list of UVEs which have read permissions for given token. Similarly, for UVE query for specific resource (e.g. analytics/uves/virtual-network/vn1), contrail-analytics-api will check the object level read permissions using VNC API.

3.1 Alternatives considered

None

3.2 API schema changes

None

3.3 User workflow impact

Tenants will not be able to view system-logs and and flow-logs.

3.4 UI changes

  1. UI needs to use VNC API to get list of networks to display in the network monitoring page based on the tenant user.
  2. System logs and flows tabs need to be greyed out for tenant user.

3.5 Notification impact

None

4. Implementation

  • Currently VNC API provides obj_perms function which takes object UUID and token, and returns the permissions.

  • A non-admin user will be able to see only non-global UVEs. There is an existing list of UVEs with a global flag indicating if it is a global UVE. Here is the list of UVEs which will be visible to a tenant user to start with:

      * virtual_network
  * virtual_machine
  * virtual_machine_interface
  * service_instance

    More will be added to this list as and when backend support is added.

  • UVEs list queries (e.g. analytics/uve/virtual-networks)

    There is an already existing mapping(_OBJECT_TABLES) from uve-type (virtual-network in the example) to corresponding uve table (ObjectVNTable in the example). An extra field indicating corredponding config object type (virtual_network for this example) will be added to that. For a uve list query, analytics-api will pass config object type and user token to ApiServer to get a list of objects that the user has permissions for.

  • System Logs and Flow Logs

    These are displayed for cloud-admin roles only

  • Object Logs

    A reverse mapping of object log type to config object type will be created using the mapping in previous section. For an object-log query, using ths mapping, get corresponding config object type. ApiServer will use this object type and user token, to return list of objects with read permissions. 'ObjectId' will be the only where clause supported for non-admin users. This clause can be used to filter the list of config objects returned by ApiServer.

  • Statistics

    Supporting stats tables for tenants will require changes in sandesh files. A new annotation (uve_type) will be added for every member that is used as index in stats tables. This uve_type will be added to the stats table schema. During query, analytics-api will retrieve uve_type for each tag. It will be used to get corresponding config object type using the mapping table defined in previous section. For every tag, list of permitted objects will be retrieved using config-type and user token.

    Here is an example of the changes in sandesh file. A stat table in virtual_network.sandesh is specified like this:

        optional list<InterVnStats>        vn_stats (tags=".other_vn,.vrouter")

    It will be changed to:

        optional list<InterVnStats>        vn_stats (tags=".other_vn,.vrouter",uve_type=".other_vn:virtual_network"))

    Corresponding stats table schema will also change from:

        {
          datatype: "string",
          index: true,
          name: "vn_stats.other_vn",
          suffixes: null
    },
    {
          datatype: "string",
          index: true,
          name: "vn_stats.vrouter",
          suffixes: null
    }

    to:

        {
          uve_type: "virtual-network",
          datatype: "string",
          index: true,
          name: "vn_stats.other_vn",
          suffixes: null
    },
    {
          uve_type: "vrouter",
          datatype: "string",
          index: true,
          name: "vn_stats.vrouter",
          suffixes: null
    }

  • Alarms

    Alarms are binned based on alarm-key (same as object type e.g. Virtual-network ) and uve-key. As mentioned in previous section, there is already a list of non-global UVEs. This list is used as a filter (tablefilt) for non-admin users. For every non-global UVE type, get list of permitted uves from ApiServer. Now, for every alarm, dsplay if uve-key is in permitted uves. Discard all other alarms

  • Alarm/uve-stream

    As mentioned in previous section, there is a list of object-log types which are supported for non-admin users. This list is passed as ‘tablefilt’ to UveStreamer. In addition, ContrailConfig structure (which has details of owner and all the domains/tenants with which that UVE is shared) is checked in every UVE to check whether the user has 'read' permissions.

5. Performance and scaling impact

5.1 API and control plane

API server will have to make additional calls per invocation of obj_perms API from VNC API for each analytics API call to verify the object level read permissions.

5.2 Forwarding performance

Not affected

6. Upgrade

We will not change the DEFAULTS.aaa_mode during upgrade if it exists in /etc/contrail/contrail-analytics-api.conf. Same provisioning flag will be used for ApiServer as well as analytics-api.

7. Deprecations

None

8. Dependencies

None

9. Testing

9.1 Unit tests

Opserver systemless tests will be added.

9.2 Dev tests

9.3 System tests

10. Documentation Impact

/etc/contrail/contrail-analytics-api.conf - section DEFAULTS, parameter aaa_mode will now support rbac as one of the values.

11. References

RBAC - https://github.com/Juniper/contrail-controller/wiki/RBAC