limit-networkaccess-disabled: Limit Network Access to Selected Networks - Disabled

id: limit-networkaccess-disabled

info:
  name: Limit Network Access to Selected Networks - Disabled
  author: DhiyaneshDK
  severity: medium
  description: |
    Limit Network Access to Selected Networks in Alibaba OSS allows you to restrict access to your object storage service (OSS) to specific IP addresses or IP ranges, enhancing security by ensuring that only trusted networks can interact with your data."
  reference:
    - https://www.trendmicro.com/cloudoneconformity/knowledge-base/alibaba-cloud/AlibabaCloud-OSS/publicly-accessible-oss-bucket.html
    - https://www.alibabacloud.com/help/en/oss/user-guide/block-public-access
  metadata:
    max-request: 2
    verified: true
  tags: cloud,devops,aliyun,alibaba,aliyun-cloud-config,alibaba-oss

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 oss ls --region $region

    extractors:
      - type: regex
        name: bucketname
        internal: true
        regex:
          - 'oss://([a-zA-Z0-9-]+)'

  - engine:
      - sh
      - bash

    source: |
      aliyun oss bucket-policy --method get $bucket --region $region

    matchers-condition: and
    matchers:
      - type: word
        words:
          - '"IpAddress":'
          - '"acs:SourceIp":'
        negative: true

      - type: word
        words:
          - '"Principal":'
          - '"Resource":'
          - '"Action":'
        condition: and

    extractors:
      - type: dsl
        dsl:
          - 'bucket + " Limit Network Access to Selected Networks is Disabled "'
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