Question 80447 in Docker Question posted in
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ArgoCD using Self signed certificate – Docker

For testing purposes, I have deployed an insecure nexus registry using self-signed certificates.

  1. I have created the rootCA, certificates and the signatures using this cheat-sheet.

  2. I have updated the certificates in the host

root@master:~/cert2# sudo update-ca-certificates
Updating certificates in /etc/ssl/certs...
0 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d...
done.
  1. I have added certificates to an nginx which acts as a proxy for the nexus:
root@mec5g:~/minidevops# docker ps
CONTAINER ID   IMAGE                    COMMAND                  CREATED          STATUS          PORTS
                           NAMES
720b50c77f24   nginx:1.18.0             "/docker-entrypoint.…"   47 minutes ago   Up 47 minutes   80/tcp, 0.0.0.0:5000->5000/tcp, :::5000->5000/tcp, 0.0.0.0:8585->8081/tcp, :::8585->8081/tcp, 0.0.0.0:8586->8082/tcp, :::8586->8082/tcp   minidevops_nginx_1
e6712602b614   sonatype/nexus3:3.37.0   "sh -c ${SONATYPE_DI…"   47 minutes ago   Up 47 minutes   0.0.0.0:32768->8081/tcp, :::32768->8081/tcp
                           minidevops_nexus_1
  1. The nexus runs properly as helm repository and docker registry:

enter image description here
enter image description here

  1. The certificates are added to ArgoCD:

enter image description here

  1. The helm repository is included:

enter image description here

  1. The application is deployed:

enter image description here

However, the "certificate signed by unknown authority" error, persists.

enter image description here

Any leads?

Note this issue is related to the other one published but is not the same: questions/75898641

Update 2023-04-01

I have followed the steps recommended but error persists:

  1. I have converted pem to crt extension: openssl x509 -outform der -in ca-cert.pem -out ca-cert.crt

  2. I have also update the ca-certificates:

usuario@mec5g:~/cert3$ sudo dpkg-reconfigure ca-certificates
Updating certificates in /etc/ssl/certs...
rehash: warning: skipping ca-certificates.crt,it does not contain exactly one certificate or CRL
rehash: warning: skipping ca-cert.pem,it does not contain exactly one certificate or CRL
1 added, 0 removed; done.
Processing triggers for ca-certificates (20211016ubuntu0.20.04.1) ...
Updating certificates in /etc/ssl/certs...
0 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d...
done.
  1. I have tried to test certificates and I got this answer (I have deleted the rest of the cryptographic material):
root@master:~/cert3# openssl s_client -connect 10.63.27.49:8585 -showcerts </dev/null
CONNECTED(00000003)
Can't use SSL_get_servername
depth=0 CN = 10.63.27.49
verify error:num=20:unable to get local issuer certificate
verify return:1
depth=0 CN = 10.63.27.49
verify error:num=21:unable to verify the first certificate
verify return:1
...
...
...

Update 2023-04-02.1

  1. I have followed the recommendations in the docker documentation about using self-signed certificates:
sudo mkdir -p /etc/docker/certs.d/10.63.27.49:6000/
sudo cp ca-cert.crt /etc/docker/certs.d/10.63.27.49:6000/ca.crt
  1. I am able now to docker login in the nexus registry:
usuario@mec5g:~/cert2$ docker login 10.63.27.49:6000 -u xxx -p xxx
WARNING! Using --password via the CLI is insecure. Use --password-stdin.
WARNING! Your password will be stored unencrypted in /home/usuario/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store

Login Succeeded
  1. The error in ArgoCD is different now:

enter image description here

Update 2023-04-02.2

  1. I have added a secret to argocd namespace:
root@master:~# kubectl create secret docker-registry regcred -n argocd --docker-username=xxx --docker-password=xxx --docker-server=10.63.27.49:6000
secret/regcred created
  1. I have added a tag to the helmchart deployment file:
spec:
  imagePullSecrets:
    - name: regcred

The error still persists.

Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    Following this ArgoCD recommendation: issue-6048:

    "Argo CD uses a kind of certificate pinning - that means, each certificate is pinned to the name of the repository server, and must be configured accordingly. The CN in the configured certificate is irrelevant, as long as it can be used to validate the server's certificate (e.g. when you supply a CA certificate to validate TLS connections). What is relevant is the certificate supplied by the remote server - this needs to be properly set-up with a SAN that actually identifies the server (through SAN extension DNS:, for example). One of the SAN entries must match the name of the server as being used to connect to it."

    1. I have used a detailed SAN to create the self-signed certificate. E.g.: subjectAltName=DNS:10.63.27.49,DNS:localhost,DNS:mec5g.es,DNS:master,IP:10.63.27.49,IP:127.0.0.1,IP:10.5.0.2"

    2. I have added certs to /ca-certificates folder. E.g.:

    sudo cp ca-cert.crt /usr/share/ca-certificates/
sudo cp server-cert.crt /usr/share/ca-certificates/
    1. I have added root CA to docker/cert.d/ folder. E.g.:
    sudo mkdir -p /etc/docker/certs.d/10.63.27.49:7000/
sudo cp ca-cert.crt /etc/docker/certs.d/10.63.27.49:7000/ca.crt
    1. I have modified the daemon.json file. E.g.:
    sudo nano /etc/docker/daemon.json

  {
    "insecure-registries" : ["10.63.27.49:7000"]
  }
    1. I have added a secret to ArgoCD namespace. E.g.:
    kubectl create secret docker-registry regcred -n argocd --docker-username=xxx --docker-password=xxx --docker-server=10.63.27.49:7000
    1. I have added a tag to the helmchart deployment file. E.g.:
      imagePullSecrets:
    - name: regcred

  2. 0

    If the certificate is self-signed, you’ll need to add it to the host’s root CAs.

    If you don’t know how, have a look here: https://unix.stackexchange.com/questions/90450/adding-a-self-signed-certificate-to-the-trusted-list

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