---
title: OSS bucket allows list action from all principals
description: Datadog, the leading service for cloud-scale monitoring.
breadcrumbs: >-
  Docs > Datadog Security > Code Security > Infrastructure as Code (IaC)
  Security > IaC Security Rules > OSS bucket allows list action from all
  principals
---

# OSS bucket allows list action from all principals

{% callout %}
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{% alert level="danger" %}
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{% /callout %}

## Metadata{% #metadata %}

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

**Provider:** Alicloud

**Platform:** Terraform

**Severity:** High

**Category:** Access Control

#### Learn More{% #learn-more %}

- [Provider Reference](https://registry.terraform.io/providers/aliyun/alicloud/latest/docs/resources/oss_bucket#policy)

### Description{% #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{% #compliant-code-examples %}

```terraform
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
}
```

```terraform
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
}
```

```terraform
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{% #non-compliant-code-examples %}

```terraform
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
}
```

```terraform
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
}
```