New subject: [Bug 1272146] Mounted secrets unreadible with SELinux enabled

Thursday, 15 October 2015

https://bugzilla.redhat.com/show_bug.cgi?id=1272146

            Bug ID: 1272146
           Summary: Mounted secrets unreadible with SELinux enabled
           Product: Fedora
           Version: 23
         Component: kubernetes
          Severity: high
          Assignee: jchaloup(a)redhat.com
          Reporter: thijs.elferink(a)topicus.nl
        QA Contact: extras-qa(a)fedoraproject.org
                CC: eparis(a)redhat.com, golang(a)lists.fedoraproject.org,
                    jcajka(a)redhat.com, jchaloup(a)redhat.com,
                    lsm5(a)redhat.com, nhorman(a)redhat.com, vbatts(a)redhat.com

Description of problem:

On a freshly installed Fedora Atomic host (as well as on a CentOS Atomic host);
When mounting a secret in a pod, the mount shows up with garbled permissions
and is inaccessible.

Version-Release number of selected component (if applicable):

ostree images (both have this problem):
  TIMESTAMP (UTC)         VERSION        ID             OSNAME                
REFSPEC
  2015-10-14 11:25:03     23.33          89be310d70     centos-atomic-host    
fedora-atomic:fedora-atomic/f23/x86_64/docker-host
  2015-10-01 09:32:09     7.20151001     1e9838ce88     centos-atomic-host    
centos-atomic-host:centos-atomic-host/7/x86_64/standard

kubernetes node description:
 Kernel Version:        4.2.3-300.fc23.x86_64
 OS Image:            Fedora 23 (Twenty Three)
 Container Runtime Version:    docker://1.7.0-dev.fc23
 Kubelet Version:        v1.1.0-alpha.0.1588+e44c8e6661c931
 Kube-Proxy Version:        v1.1.0-alpha.0.1588+e44c8e6661c931

How reproducible:

always

Steps to Reproduce:
1. fresh fedora/centos atomic host
2. deploy secret (kubectl create -f secret.json)

secret.json:

{
  "apiVersion": "v1",
  "kind": "Secret",
  "metadata" : {
    "name": "test-secret"
  },
  "type": "Opaque",
  "data": {
    "test-data":"dGVzdDEyMw=="
  }
}

3. deploy pod (kubectl create -f test-pod.yaml)

test-pod.yaml:

apiVersion: v1
kind: Pod
metadata:
  name: test-pod
spec:
  containers:
  - name: test
    image: busybox
    volumeMounts:
    - name: "test-volume"
      mountPath: "/test"
      readOnly: true
    command: ["sh"]
    args: ["-c 'ls -l /test/test-data; cat /test/test-data'"]

  volumes:
    - name: "test-volume"
      secret:
        secretName: "test-secret"

Actual results:

output:

-bash-4.2# kubectl logs test-pod
ls: cannot access /test/test-data: Permission denied
total 0
-????????? ? ? ? ?            ? test-data
cat: /test/test-data: Permission denied

Expected results:

output:

-bash-4.2# kubectl logs test-pod
total 4
-r--r--r--. 1 root root 7 Oct 15 08:08 test-data
test123

Additional info:

After disabling SELinux (setenforce 0) the secret is accessible.

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[Bug 1272146] New: Mounted secrets unreadible with SELinux enabled