public-actiontrail-bucket: ActionTrail Log Buckets - Publicly Exposed

id: public-actiontrail-bucket

info:
  name: ActionTrail Log Buckets - Publicly Exposed
  author: ritikchaddha
  severity: high
  description: |
    Identify any publicly accessible ActionTrail trail log buckets in order to determine if your Alibaba Cloud account could be at risk. A publicly accessible trail bucket is a bucket were all users, including anonymous users, can perform read and write operations on the objects within the bucket.
  reference:
    - https://www.trendmicro.com/cloudoneconformity/knowledge-base/alibaba-cloud/AlibabaCloud-ActionTrail/trail-bucket-publicly-accessible.html
  metadata:
    max-request: 2
    verified: true
  tags: cloud,devops,aliyun,alibaba,aliyun-cloud-config,actiontrail

variables:
  region: "cn-hangzhou"

flow: |
  code(1)
  for (let BucketName of iterate(template.bucketname)) {
    set("bucket", BucketName)
    code(2)
  }

self-contained: true

code:
  - engine:
      - sh
      - bash
    source: |
      aliyun actiontrail DescribeTrails --region $region

    extractors:
      - type: json
        name: bucketname
        internal: true
        json:
          - '.TrailList[].OssBucketName'

  - engine:
      - sh
      - bash
    source: |
      ossutil stat oss://$bucket

    matchers:
      - type: regex
        regex:
          - 'ACL.*:.*public-read-write'

    extractors:
      - type: dsl
        dsl:
          - 'bucket + " Bucket associated with ActionTrail trail is publicly accessible"'
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