gcloud-api-key-unrestricted: Unrestricted API Key Usage

id: gcloud-api-key-unrestricted

info:
  name: Unrestricted API Key Usage
  author: princechaddha
  severity: medium
  description: |
    Ensure that the use of Google Cloud API keys is limited to trusted and reliable hosts, HTTP referrers, or applications. An API key application restriction manages the authorization of websites, IP addresses, or Android/iOS mobile applications that can employ your API key. It is crucial that all API keys used in production employ host and application restrictions. By enforcing these restrictions, you can reduce the impact that a compromised API key can have on your applications.
  impact: |
    API keys without restrictions can be used unrestrictedly, which might lead to unauthorized access and misuse, potentially exposing sensitive data or services.
  remediation: |
    Apply restrictions to all production API keys to specify the allowed websites, IP addresses, or mobile applications that can use each key, to mitigate potential abuse.
  reference:
    - https://cloud.google.com/docs/authentication/api-keys#restricting_api_keys
  tags: cloud,devops,gcp,gcloud,api-keys,gcp-cloud-config

flow: |
  code(1)
  for(let projectId of iterate(template.projectIds)){
    set("projectId", projectId)
    code(2)
    for(let uid of iterate(template.uids)){
      set("uid", uid)
      code(3)
    }
  }

self-contained: true

code:
  - engine:
      - sh
      - bash
    source: |
      gcloud projects list --format="json(projectId)"

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

  - engine:
      - sh
      - bash
    source: |
      gcloud alpha services api-keys list --project $projectId --format="json(uid)"

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

  - engine:
      - sh
      - bash
    source: |
      gcloud alpha services api-keys describe $uid --format="json(restrictions)"

    matchers:
      - type: word
        words:
          - 'null'

    extractors:
      - type: dsl
        dsl:
          - '"Unrestricted API Key: " + uid + " in Project: " + projectId'
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