x509_updater.py

# Copyright (c) 2019, IRIS-HEP
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import os
import sys
import time

import kubernetes
from kubernetes import client
import base64
import argparse

parser = argparse.ArgumentParser()
parser.add_argument("--secret",
                    help="Name of kubernetes secret to save proxy to",
                    dest='secret', action='store',
                    required=False, default=None)

parser.add_argument("--voms",
                    help="Name of CERN virtual org to authenticate against",
                    dest='voms', action='store',
                    required=True)

args = parser.parse_args()

if args.secret:
    secret_name = args.secret
    print("Creating secret:", secret_name)
    kubernetes.config.load_incluster_config()

    # For command line testing
    # kubernetes.config.load_kube_config()

    pod_namespace = os.environ['MY_POD_NAMESPACE']
else:
    secret_name = None
    print("Saving to docker volume")


myCmd = """
 voms-proxy-init --pwstdin -key /etc/grid-certs/userkey.pem \
                  -cert /etc/grid-certs/usercert.pem \
                  --voms=%s \
                  <  /etc/grid-certs-ro/passphrase
                  """
os.system(myCmd % args.voms)
f = "/tmp/x509up"

if not secret_name:
    sys.exit(0)

print("Delete existing secret if present")
try:
    client.CoreV1Api().delete_namespaced_secret(
        namespace=pod_namespace, name=secret_name)
except kubernetes.client.rest.ApiException as api_exception:
    print("No existing secret to delete")


secret_created = False
while True:
    with open(f, 'rb') as proxy_file:
        data = {'x509up': base64.b64encode(
            proxy_file.read()).decode("ascii")}
        secret = client.V1Secret(data=data,
                                 kind='Secret',
                                 type='Opaque',
                                 metadata=client.V1ObjectMeta(
                                     name=secret_name))

        if secret_created:
            client.CoreV1Api().patch_namespaced_secret(name=secret_name,
                                                       namespace=pod_namespace, body=secret)
            print("Updated proxy cert in %s" % secret_name)

        else:
            client.CoreV1Api().create_namespaced_secret(
                namespace=pod_namespace, body=secret)
            print("Created Secret %s" % secret_name)
            secret_created = True

    time.sleep(6*60*60)
    os.system(myCmd % args.voms)