OSS bucket allows list action from all principals

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Metadata

Id: terraform-alicloud-oss-bucket-allows-list-action-from-all-principals

Provider: Alicloud

Platform: Terraform

Severity: High

Category: Access Control

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Description

The policy of an alicloud_oss_bucket must not allow List actions for all principals. Such policies can expose private data or enable unauthorized tampering or deletion. Specifically, Effect must not be Allow when Action includes List and Principal is set to "*". This rule flags alicloud_oss_bucket[*].policy documents that permit List actions to all principals.

Compliant Code Examples

resource "alicloud_oss_bucket" "bucket-policy2" {
  bucket = "bucket-2-policy"
  acl    = "private"

  policy = <<POLICY
  {"Statement": [
    {
        "Action": [
            "oss:AbortMultipartUpload"
        ],
        "Effect": "Allow",
        "Principal": [
            "*"
        ],
        "Resource": [
            "acs:oss:*:174649585760xxxx:examplebucket"
        ]
    }
  ],
   "Version":"1"}
  POLICY
}

resource "alicloud_oss_bucket" "bucket-policy3" {
  bucket = "bucket-3-policy"
  acl    = "private"

  policy = <<POLICY
  {"Statement": [
    {
        "Action": [
            "oss:ListObjectVersions", "oss:ListObjects", "oss:ListParts"
        ],
        "Effect": "Allow",
        "Principal": [
            "20214760404935xxxx"
        ],
        "Resource": [
            "acs:oss:*:174649585760xxxx:examplebucket"
        ]
    }
  ],
   "Version":"1"}
  POLICY
}

resource "alicloud_oss_bucket" "bucket-policy4" {
  bucket = "bucket-4-policy"
  acl    = "private"

  policy = <<POLICY
  {"Statement": [
    {
        "Action": [
            "oss:ListObjectVersions", "oss:ListObjects", "oss:ListParts"
        ],
        "Effect": "Deny",
        "Principal": [
            "*"
        ],
        "Resource": [
            "acs:oss:*:174649585760xxxx:examplebucket"
        ]
    }
  ],
   "Version":"1"}
  POLICY
}

Non-Compliant Code Examples

resource "alicloud_oss_bucket" "bucket-policy1" {
  bucket = "bucket-1-policy"
  acl    = "private"

  policy = <<POLICY
  {"Statement": [
    {
        "Action": [
            "oss:ListObjectVersions", "oss:ListObjects", "oss:ListParts"
        ],
        "Effect": "Allow",
        "Principal": [
            "*"
        ],
        "Resource": [
            "acs:oss:*:174649585760xxxx:examplebucket"
        ]
    }
  ],
   "Version":"1"}
  POLICY
}

resource "alicloud_oss_bucket" "bucket-policy5" {
  bucket = "bucket-5-policy"
  acl    = "private"

  policy = <<POLICY
  {"Statement": [
    {
        "Action": [
            "oss:ListObjectVersions", "oss:RestoreObject"
        ],
        "Effect": "Allow",
        "Principal": [
            "*"
        ],
        "Resource": [
            "acs:oss:*:174649585760xxxx:examplebucket"
        ]
    }
  ],
   "Version":"1"}
  POLICY
}