X509 Certs

Nova has an x509 cert store that it uses for the ec2 bundling image process and the cloudpipe vpn system. Currently the code runs inside the API server - which leads to issues if you want to want to run the api server on multiple boxes.

Nova creates a chain per project (tenants in the keystone world). Users can request certificates for projects (tenants) they are members of.

STATUS: DRAFT

QUESTIONS:

what is the api for validation? Is there an admin API to download the chain (for cloudpipe?) or do we expose a validation method?
need ability to request cloud public key (for ec2 bundling)

Overview:

move x509 into a nova-manager, run from a host that manages the CA directory
openstack (admin-only?) extension for management - there is some (deprecated) usage in the ec2/admin.py
use rpc to communicate between API and x509 manager
api is a wrapper around most of the nova/crypto.py interface

[ OS API ] <=> [ x509-manager ] <=> [ crypto logic ]

Cleanup

make generate_vpn_credentials use get_x509_cert
key certs off of subject instead of user_id

Manager

Create a nova-x509 bin that is a nova-manager. A manager in nova is a process that: has flags, has an RPC and DB connection. (example managers are nova-scheduler)

OS API Extension

The following are users of the extension:

the dashboard - for getting certs for users (building a novarc / nova.zip)
- CRUD around certs for a user (scoped by a tenant)
cloudpipe
- CRUD for tenant cert works here

CALLS

get_tenant_cert -- gets the top level tenant cert
get_signed_cert(subject) -- (non-unique-)subject = user_id or cloudpipe_key(uuid?) returns cert signed by top level cert and private key
revoke_certs(subject=None) -- revokes all certs for subject or all certs
get crl -- returns certificate revocation list

REST OBJECT:

    {"cert": {"x509": "text",
              "tenant_id": tenant_id,
              "created": "12/12/12",
              "enabled": True}}

Openstack Admin API Extension

Ability to decrypt a small blob of text using the chain for a given tenant:

method name: decrypt
input: tenant_id, encrypted text
output: decrypted text

367         iv, err = utils.execute('openssl',
368                                 'rsautl',
369                                 '-decrypt',
370                                 '-inkey', '%s' % tenant_chain_key,
371                                 process_input=encrypted_iv,
372                                 check_exit_code=False)

vishy: Cloudpipe could just request the crl on a regular basis without needing to grab all of the other files.

Old EC2 Extension

    def generate_x509_for_user(self, context, name, project=None, **kwargs):
        """Generates and returns an x509 certificate for a single user.
           Is usually called from a client that will wrap this with
           access and secret key info, and return a zip file.
        """
        if project is None:
            project = name
        project = manager.AuthManager().get_project(project)
        user = manager.AuthManager().get_user(name)
        msg = _("Getting x509 for user: %(name)s"
                " on project: %(project)s") % locals()
        LOG.audit(msg, context=context)
        return user_dict(user, base64.b64encode(project.get_credentials(user)))

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