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from kubernetes import client, config, watch
import os
import uuid
import json
import tempfile
import time
def check_filesharerequest(obj, crds, group, version, filesharerequests_plural):
fsr = crds.list_namespaced_custom_object(
group, version, "shares", filesharerequests_plural
)
if len(fsr["items"]) > 5:
return (
False,
"Five FilleSharedRequests are deployed somewhere in the cluster, you need to delete them first!",
)
fr = json.loads(json.dumps(obj))
if "spec" not in fr:
return False, "FilleSharedRequest: Missing Spec"
if "shareName" not in fr["spec"]:
return False, "FilleSharedRequest: Missing Spec shareName"
if "accessModes" not in fr["spec"]:
return False, "FilleSharedRequest: Missing Spec accessModes"
# Check the accessModes
valid_modes = ("ReadWriteOnce", "ReadOnlyMany", "ReadWriteMany", "ReadWriteOncePod")
if not all(mode in valid_modes for mode in fr["spec"]["accessModes"]):
return False, "FilleSharedRequest: Invalid Spec accessModes values, "
"only allow ReadWriteOnce, ReadOnlyMany, ReadWriteMany, ReadWriteOncePod"
if "storage" not in fr["spec"]:
return False, "FilleSharedRequest: Missing Spec storage, must be less than 1Gi"
return True, "Worked"
def create_pv_pvc(
client, pvcobj, crds, group, version, filesharerequests_plural, pv_name, pvc_name
):
v1 = client.CoreV1Api()
pvc_spec = pvcobj["spec"]
# Define PV
pv = client.V1PersistentVolume(
api_version="v1",
kind="PersistentVolume",
metadata=client.V1ObjectMeta(name=pv_name),
spec=client.V1PersistentVolumeSpec(
capacity={"storage": pvc_spec["storage"]},
access_modes=pvc_spec["accessModes"],
persistent_volume_reclaim_policy="Delete",
storage_class_name=pvc_spec["shareName"],
host_path=client.V1HostPathVolumeSource(path=tempfile.mkdtemp()),
),
)
# Define PVC
pvc = client.V1PersistentVolumeClaim(
api_version="v1",
kind="PersistentVolumeClaim",
metadata=client.V1ObjectMeta(name=pvc_name, namespace="shares"),
spec=client.V1PersistentVolumeClaimSpec(
access_modes=pvc_spec["accessModes"],
resources=client.V1ResourceRequirements(
requests={"storage": pvc_spec["storage"]}
),
storage_class_name=pvc_spec["shareName"],
),
)
try:
# Create PVC
v1.create_namespaced_persistent_volume_claim(namespace="shares", body=pvc)
print(f"PersistentVolumeClaim {pvc.metadata.name} created.")
# Create PV
v1.create_persistent_volume(body=pv)
print(f"PersistentVolume {pv.metadata.name} created.")
return True
except client.exceptions.ApiException as e:
print(f"Exception when creating PV or PVC: {e}")
return False
def main():
# Define CRDs
version = "v1"
group = "ctf.r3kapig.com"
fileshare_kind = "FileShares"
fileshares_plural = "fileshares"
filesharerequests_plural = "filesharerequests"
# Load CRDs and V1 API
crds = client.CustomObjectsApi()
v1 = client.CoreV1Api()
while True:
print("Watching for filerequests...")
stream = watch.Watch().stream(
crds.list_namespaced_custom_object,
group,
version,
"shares",
filesharerequests_plural,
)
for event in stream:
t = event["type"]
filesharerequest = event["object"]
match t:
case "ADDED":
# Check wether it was already created
# Check if the filerequest is legal
checked, error = check_filesharerequest(
filesharerequest, crds, group, version, filesharerequests_plural
)
if not checked:
crds.create_namespaced_custom_object(
group,
version,
"shares",
fileshares_plural,
{
"apiVersion": f"{group}/{version}",
"kind": fileshare_kind,
"metadata": {
"name": f"{filesharerequest["metadata"]["name"]}-fileshare"
},
"spec": {
"podName": "",
"error": error,
},
},
)
continue
pv_name = f"{filesharerequest["metadata"]["name"]}-pv"
pvc_name = f"{filesharerequest["metadata"]["name"]}-pvc"
if not create_pv_pvc(
client,
filesharerequest,
crds,
group,
version,
filesharerequests_plural,
pv_name,
pvc_name,
):
print("Error create the pv and pvc")
continue
pod_name = f'{filesharerequest["metadata"]["name"]}-pod'
pod_spec = client.V1Pod(
api_version="v1",
kind="Pod",
metadata=client.V1ObjectMeta(
name=pod_name, labels={"app": "secure-pod"}
),
spec=client.V1PodSpec(
containers=[
client.V1Container(
name="my-container",
image="registry-docker:5000/busybox:1.34.1",
command=["bin/sh"],
args=["-c", "sleep inf"],
resources=client.V1ResourceRequirements(
limits={"cpu": "0.5", "memory": "300Mi"},
),
security_context=client.V1SecurityContext(
read_only_root_filesystem=True, # Set the root filesystem as read-only
run_as_non_root=True, # Run as non-root user
run_as_user=1000, # Specify the user ID
run_as_group=1000,
capabilities=client.V1Capabilities(
drop=["ALL"] # Drop all capabilities
),
allow_privilege_escalation=False, # Disallow privilege escalation
),
volume_mounts=[
client.V1VolumeMount(
mount_path="/my-sharefile",
name="fileshare-storage",
read_only=True,
)
],
)
],
volumes=[
client.V1Volume(
name="fileshare-storage",
persistent_volume_claim=client.V1PersistentVolumeClaimVolumeSource(
claim_name=pvc_name
),
)
],
automount_service_account_token=False,
),
)
try:
api_response = v1.create_namespaced_pod(
namespace="shares", body=pod_spec
)
# Waiting for Pod Running
start_time = time.time()
# Timeout 120
while time.time() - start_time < 120:
pod_status = v1.read_namespaced_pod_status(
namespace="shares", name=pod_name
)
current_status = pod_status.status.phase
if current_status != "Pending":
break
time.sleep(3)
print("Pod running with security configurations")
except Exception as e:
print(f"Exception when updating Pod: {e}")
error = f"Exception when updating Pod: {e}"
continue
# Return the result to fileshare
crds.create_namespaced_custom_object(
group,
version,
"shares",
fileshares_plural,
{
"apiVersion": f"{group}/{version}",
"kind": fileshare_kind,
"metadata": {
"name": f"{filesharerequest["metadata"]["name"]}-fileshare"
},
"spec": {
"podName": pod_name,
"error": error,
},
},
)
case "DELETED":
pv_name = f"{filesharerequest["metadata"]["name"]}-pv"
pvc_name = f"{filesharerequest["metadata"]["name"]}-pvc"
pod_name = f"{filesharerequest["metadata"]["name"]}-pod"
# Delete Pod
try:
api_response = v1.delete_namespaced_pod(
name=pod_name,
namespace="shares",
body=client.V1DeleteOptions(),
)
print("Pod deleted")
except Exception as e:
print(f"Exception when deleting Pod: {e}")
try:
crd_name = f"{fileshares_plural}.{group}"
api_response = crds.delete_namespaced_custom_object(
group,
version,
"shares",
fileshares_plural,
f"{filesharerequest["metadata"]["name"]}-fileshare",
)
except Exception as e:
print(f"Exception when deleting CustomResourceDefinition: {e}")
# Delete PVC
v1.delete_namespaced_persistent_volume_claim(
name=pvc_name, namespace="shares"
)
# Delete PV
v1.delete_persistent_volume(name=pv_name)
case _:
pass
if __name__ == "__main__":
print("Starting operator...")
try:
config.incluster_config.load_incluster_config()
except Exception as e:
print("Failed to load incluster config")
exit(1)
main()
|
shenghuo2