Gitaly token rotation

Execution

To disable enforcement of gitaly authentication:

• Disable enforcement of gitaly authentication by setting default_attributes['omnibus-gitlab']['gitlab_rb']['gitaly']['auth_transitioning'] = true in gprd-base-stor-gitaly

  "default_attributes": {
    [...]
    "omnibus-gitlab": {
      "gitlab_rb": {
        [...]
        "gitaly": {
          "auth_transitioning": true,
          [...]

• apply the changes to the gitaly servers. knife ssh -C3 roles:gprd-base-stor-gitaly 'sudo chef-client'
• Ensure that gitaly_authentications_total is set to true in prometheus and that 100% of all requests are “unenforced”
  • https://thanos.gitlab.net/graph?g0.range_input=1h&g0.expr=count(gitaly_authentications_total%7Benv%3D%22gprd%22%2Cenforced%3D%22true%22%2Cstatus%3D~%22.*ok%22%7D)%20or%20vector(0)&g0.tab=0
  • That should go down to 0

Backup and replace the current auth_token

• Save the current auth_token in case we need to revert.
  • ./bin/gkms-vault-show gitlab-omnibus-secrets gprd | jq -r '.["omnibus-gitlab"].gitlab_rb.gitaly.auth_token' within chef-repo
  • Save it it 1Password and document the name it was saved under.
  • Also backup the whole file locally in case it gets corrupted later during the change ./bin/gkms-vault-show gitlab-omnibus-secrets gprd > gitlab-omnibus-secrets.bak
• Create a new random token echo "$(pwgen 16 1)-gprdtoken"
• Update the auth token in the gitlab-omnibus-secrets gprd vault by setting gitaly['auth_token']
• Update the auth token in the gitlab-omnibus-secrets gprd vault for the application by setting ["omnibus-gitlab"].gitlab_rb.gitlab_rails.gitaly_token
• and apply that to the fleet
  • knife ssh -C3 roles:gprd-base-stor-gitaly 'sudo chef-client'
  • knife ssh -C3 roles:gprd-base-console-node 'sudo chef-client'
• Follow instructions provided for our Kubernetes Infrastructure: https://gitlab.com/gitlab-com/gl-infra/k8s-workloads/gitlab-com/-/blob/master/README.md#secret-rotation

Verify that the tokens are updated in all the places and ensure that authentication is working as expected.

• https://thanos.gitlab.net/graph?g0.range_input=1h&g0.expr=count(gitaly_authentications_total%7Benv%3D%22gprd%22%2Cenforced%3D%22false%22%2Cstatus%3D~%22.*ok%22%7D)%20or%20vector(0)&g0.tab=0
• This should be equal to the number of gitaly nodes
• Finally, re-enable authentication enforcement by removing the gitaly['auth_transitioning'] = true setting added to the role in step 1
• apply that to the gitlay servers. knife ssh -C3 roles:gprd-base-stor-gitaly 'sudo chef-client'

Rollback

Follow the execution steps, but instead of creating a new token via pwgen set the old token in the vault.