azure-vm-ssh-auth-type: Azure VM SSH Authentication Type Not Using Keys

id: azure-vm-ssh-auth-type
info:
  name: Azure VM SSH Authentication Type Not Using Keys
  author: princechaddha
  severity: high
  description: |
    Ensure that your production Microsoft Azure virtual machines are configured to use SSH keys instead of username/password credentials for SSH authentication. Using SSH keys enhances security by eliminating the risks associated with password-based authentication.
  impact: |
    Using password-based SSH authentication can expose virtual machines to unauthorized access if the passwords are weak or compromised.
  remediation: |
    Configure all Azure virtual machines to use SSH keys for authentication. Disable password authentication to enhance the security of your virtual machines.
  reference:
    - https://docs.microsoft.com/en-us/azure/virtual-machines/linux/ssh-from-windows
  tags: cloud,devops,azure,microsoft,vm,azure-cloud-config

flow: |
  code(1);
  for (let vmData of iterate(template.vmList)) {
    set("ids", vmData);
    code(2);
  }

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      az vm list --query '[*].id'

    extractors:
      - type: json
        name: vmList
        internal: true
        json:
          - '.[]'

  - engine:
      - sh
      - bash
    source: |
      az vm show --ids "$ids" --query 'osProfile.linuxConfiguration.disablePasswordAuthentication'

    matchers:
      - type: word
        words:
          - 'false'

    extractors:
      - type: dsl
        dsl:
          - 'ids + " is configured with password-based SSH authentication, which is insecure"'
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