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Update public-accessibility-logic.md for S3 #20306

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Dec 11, 2023
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Update public-accessibility-logic.md for S3 #20306

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Update public-accessibility-logic.md for S3
christophetd Oct 23, 2023
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Merge branch 'master' into christophetd/s3-bucket-rap
hestonhoffman Oct 23, 2023
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Update content/en/security/cloud_security_management/guide/public-acc…
danieldebeer-dd Dec 3, 2023
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Merge branch 'master' into christophetd/s3-bucket-rap
hestonhoffman Dec 8, 2023
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hestonhoffman Dec 8, 2023
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15 changes: 2 additions & 13 deletions content/en/security/cloud_security_management/guide/public-accessibility-logic.md
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Expand Up @@ -35,21 +35,10 @@ The following section details on a resource-by-resource basis the logic behind p

An [S3 Bucket][1] (`aws_s3_bucket`) is considered publicly accessible if:

* _ACL-determined access:_

| **Criteria** | **Explanation** |
|--------------|-----------------|
|The bucket's `public_access_block_configuration` and the bucket account's public access block (`aws_s3_account_public_access_block`) both have `ignore_public_acls` set to `false`. |An Access Control List (ACL) defines the AWS accounts and groups that are granted access to this bucket. With `ignore_public_acls` set to `false`, the bucket's configuration permits the use of an ACL that allows public access. |
|The bucket's grant list contains a URI value of `http://acs.amazonaws.com/groups/global/AllUsers` or `/AuthenticatedUsers`. |`AllUsers` gives anyone in the world access to the bucket. `AuthenticatedUsers` gives any AWS authenticated user in the world access to the bucket. |

***OR***

* _Bucket Policy-determined access:_

| **Criteria** | **Explanation** |
|--------------|-----------------|
|The bucket's `public_access_block_configuration` and the bucket account's public access block (`aws_s3_account_public_access_block`) both have `ignore_public_acls` set to `false`. |An Access Control List (ACL) defines the AWS accounts and groups that are granted access to this bucket. With `ignore_public_acls` set to `false`, the bucket's configuration permits the use of an ACL that allows public access. |
|The bucket's policy statement allows the `s3:GetObject` permission unconditionally, with resource and principal set to `"*"`. |This defines a public policy on the bucket, meaning that cross-account access is allowed. `"*"` is a wildcard, meaning access is given to any resource and principal. |
|The bucket policy allows the `s3:GetObject` permission unconditionally, with resource and principal set to `"*"`. |This defines a public policy on the bucket, meaning that unauthenticated access is allowed. `"*"` is a wildcard, meaning access is given to any resource and principal. |
| Both of the bucket's `public_access_block_configuration` and the AWS account's public access block (`aws_s3_account_public_access_block`) have `restrict_public_buckets` set to `false`. | None of the bucket's or account's explicitely blocks public access, meaning that the public bucket policy takes effect. |
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See [Blocking public access to your Amazon S3 storage][2] for more information.

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