---
title: OSS bucket allows all actions 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 all actions from all
  principals
---

# OSS bucket allows all actions from all principals

{% callout %}
# Important note for users on the following Datadog sites: app.ddog-gov.com, us2.ddog-gov.com

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

{% /callout %}

## Metadata{% #metadata %}

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

**Provider:** Alicloud

**Platform:** Terraform

**Severity:** Critical

**Category:** Access Control

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

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

### Description{% #description %}

OSS buckets must not allow all actions (`*`) from all principals, as this can expose private data or permit unauthorized modification or deletion. This rule inspects the `policy` attribute of `alicloud_oss_bucket` resources to detect such configurations. Specifically, `Effect` must not be `Allow` when both `Action` and `Principal` are set to `*`.

## Compliant Code Examples{% #compliant-code-examples %}

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

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

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

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