Accessing a Rancher cluster fails with "unable to get issuer certificate"

[gautaz]

Hello,

This is very similar to #327 but the infrastructure used is public and the certificate is not self signed.

I am using the following piece of code:

const {join} = require('path');
const k8s = require('@kubernetes/client-node');
const kc = new k8s.KubeConfig();

kc.loadFromFile(join(__dirname, 'kubeconfig.yaml'));
kc.setCurrentContext('kubedev');

const k8sApi = kc.makeApiClient(k8s.CoreV1Api);

k8sApi.listPodForAllNamespaces()
  .then(console.log.bind(console))
  .catch(console.error.bind(console));

This fails this way:

Error: unable to get issuer certificate
    at TLSSocket.onConnectSecure (_tls_wrap.js:1474:34)
    at TLSSocket.emit (events.js:310:20)
    at TLSSocket._finishInit (_tls_wrap.js:917:8)
    at TLSWrap.ssl.onhandshakedone (_tls_wrap.js:687:12) {
  code: 'UNABLE_TO_GET_ISSUER_CERT'
}

But succeeds if insecure-skip-tls-verify: true is added to the kubeconfig.yaml file.

The kubeconfig.yaml file comes directly from the Rancher UI and works well with kubectl.

Any idea how I can diagnose this issue any further ?

[brendandburns]

Can you send the contents of your kubeconfig file (with personal information removed/obfuscated)

Somehow the certificate authority isn't getting loaded correctly (I think)

[gautaz]

@brendanburns Sorry for answering so lately, I have been a bit too busy these last days.

Here is the kubeconfig file used:

apiVersion: v1
kind: Config
clusters:
  - name: 'kubedev'
    cluster:
      server: 'https://SOMEPUBLICURL'
      certificate-authority-data: "LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCk1JSUdFekNDQ\
        S91Z0F3SUJBZ0lRZlZ0UkpyUjJ1aEhiZEJZTHZGTU5wekFOQmdrcWhraUc5dzBCQVF3RkFEQ0IKa\
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  - name: 'kubedev-kubedev1'
    cluster:
      server: 'https://SOMEIPADDRESS:6443'
      certificate-authority-data: "LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCk1JSUN3akNDQ\
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        klDQVRFLS0tLS0K"

users:
  - name: 'USER'
    user:
      token: 'THE USER TOKEN'

contexts:
  - name: 'kubedev'
    context:
      user: 'USER'
      cluster: 'kubedev'
  - name: 'kubedev-kubedev1'
    context:
      user: 'USER'
      cluster: 'kubedev-kubedev1'

current-context: 'kubedev'

Hope you'll find something...

[brendandburns]

I'll try to load up this certificate authority and see if there are any obvious errors.

[fejta-bot]

Issues go stale after 90d of inactivity. Mark the issue as fresh with /remove-lifecycle stale. Stale issues rot after an additional 30d of inactivity and eventually close.

If this issue is safe to close now please do so with /close.

Send feedback to sig-testing, kubernetes/test-infra and/or fejta. /lifecycle stale

[gautaz]

/remove-lifecycle stale

[brendandburns]

/lifecycle frozen

[able8]

The root cause is that the cluster CA is an intermediate CA certificate which are not trusted by Nodejs https://github.com/nodejs/node/issues/36453

[gautaz]

Thanks @able8 for this analysis. Let's hope that linking these types of issue to the NodeJS one will pave the way to a NodeJS option controlling the openssl X509_V_FLAG_PARTIAL_CHAIN flag.

[zgaduj]

For temporary solution: process.env.NODE_TLS_REJECT_UNAUTHORIZED = "0";

[gautaz]

Spring cleaning time! There is no need to keep this issue anymore, feel free to reopen a new one if needed.