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helm: add least privileges logic for secrets on ceph-csi-cephfs chart

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this allows the encryption KMS config to be granted secret access with
a least privilges policy.

Signed-off-by: Antoine C <hi@acolombier.dev>
This commit is contained in:
Antoine C 2024-05-15 12:24:44 +01:00 committed by Madhu-1
parent 3a19452d45
commit f78e8ee9e0
5 changed files with 21 additions and 7 deletions
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11
charts/ceph-csi-cephfs/README.md
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@ -83,6 +83,16 @@ storageClass:
encryptionKMSID: kubernetes
```
#### Least privilege secret access
If you use the `metadata` and let RBAC created by the chart, permissions
will be given to access **only** the secret referenced in the
`encryptionKMSConfig`. This is something important to keep in mind, as a
manual change to the config to point to another secret or add further KMS
config will not be authorized. If you wish to give CephCSI a global secret
access to the cluster, you may set `rbac.leastPrivileges` to `false`, and
permissions will be granted globally via a *ClusterRole*.
#### Known Issues Upgrading
- When upgrading to version >=3.7.0, you might encounter an error that the
@ -127,6 +137,7 @@ charts and their default values.
| Parameter | Description | Default |
| ---------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------- |
| `rbac.create` | Specifies whether RBAC resources should be created | `true` |
| `rbac.leastPrivileges` | Specifies whether RBAC resources should be created with a restricted scope when supported (only secrets supported currently) | `true` |
| `serviceAccounts.nodeplugin.create` | Specifies whether a nodeplugin ServiceAccount should be created | `true` |
| `serviceAccounts.nodeplugin.name` | The name of the nodeplugin ServiceAccount to use. If not set and create is true, a name is generated using the fullname | "" |
| `serviceAccounts.provisioner.create` | Specifies whether a provisioner ServiceAccount should be created | `true` |

3
charts/ceph-csi-cephfs/templates/nodeplugin-clusterrole.yaml
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@ -3,7 +3,6 @@ kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: {{ include "ceph-csi-cephfs.nodeplugin.fullname" . }}
namespace: {{ .Release.Namespace }}
labels:
app: {{ include "ceph-csi-cephfs.name" . }}
chart: {{ include "ceph-csi-cephfs.chart" . }}
@ -19,7 +18,7 @@ rules:
- apiGroups: [""]
resources: ["configmaps"]
verbs: ["get"]
{{- if and .Values.encryptionKMSConfig .Values.encryptionKMSConfig.secretNamespace (not (eq .Values.encryptionKMSConfig.secretNamespace .Release.Namespace)) }}
{{- if and .Values.encryptionKMSConfig .Values.encryptionKMSConfig.secretNamespace (not .Values.rbac.leastPrivileges) }}
# allow to read the encryption key used with the metadata KMS
- apiGroups: [""]
resources: ["secrets"]

5
charts/ceph-csi-cephfs/templates/nodeplugin-role.yaml
View File

@ -1,9 +1,10 @@
{{- if .Values.rbac.create -}}
{{- if and .Values.encryptionKMSConfig .Values.encryptionKMSConfig.secretNamespace .Values.encryptionKMSConfig.secretName (eq .Values.encryptionKMSConfig.secretNamespace .Release.Namespace) -}}
{{- if and .Values.rbac.create .Values.rbac.leastPrivileges -}}
{{- if and .Values.encryptionKMSConfig (eq .Values.encryptionKMSConfig.encryptionKMSType "metadata") .Values.encryptionKMSConfig.secretNamespace .Values.encryptionKMSConfig.secretName -}}
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: {{ include "ceph-csi-cephfs.nodeplugin.fullname" . }}
namespace: {{ .Values.encryptionKMSConfig.secretNamespace }}
labels:
app: {{ include "ceph-csi-cephfs.name" . }}
chart: {{ include "ceph-csi-cephfs.chart" . }}

6
charts/ceph-csi-cephfs/templates/nodeplugin-rolebinding.yaml
View File

@ -1,10 +1,10 @@
{{- if .Values.rbac.create -}}
{{- if and (eq .Values.encryptionKMSConfig.encryptionKMSType "metadata") (eq .Values.encryptionKMSConfig.secretNamespace .Release.Namespace) -}}
{{- if and .Values.rbac.create .Values.rbac.leastPrivileges -}}
{{- if and .Values.encryptionKMSConfig (eq .Values.encryptionKMSConfig.encryptionKMSType "metadata") .Values.encryptionKMSConfig.secretNamespace -}}
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: {{ include "ceph-csi-cephfs.nodeplugin.fullname" . }}
namespace: {{ .Release.Namespace }}
namespace: {{ .Values.encryptionKMSConfig.secretNamespace }}
labels:
app: {{ include "ceph-csi-cephfs.name" . }}
chart: {{ include "ceph-csi-cephfs.chart" . }}

3
charts/ceph-csi-cephfs/values.yaml
View File

@ -2,6 +2,9 @@
rbac:
# Specifies whether RBAC resources should be created
create: true
# When possible try and reduce the scope of permission to only give
# access to resources defined in the config. See the README for more info
leastPrivileges: true
serviceAccounts:
nodeplugin: