IAM policy for Google storage bucket

Three different resources help you manage your IAM policy for storage bucket. Each of these resources serves a different use case:

• google_storage_bucket_iam_binding: Authoritative for a given role. Updates the IAM policy to grant a role to a list of members. Other roles within the IAM policy for the storage bucket are preserved.
• google_storage_bucket_iam_member: Non-authoritative. Updates the IAM policy to grant a role to a new member. Other members for the role for the storage bucket are preserved.
• google_storage_bucket_iam_policy: Setting a policy removes all other permissions on the bucket, and if done incorrectly, there's a real chance you will lock yourself out of the bucket. If possible for your use case, using multiple google_storage_bucket_iam_binding resources will be much safer. See the usage example on how to work with policy correctly.

Note: google_storage_bucket_iam_binding resources can be used in conjunction with google_storage_bucket_iam_member resources only if they do not grant privilege to the same role.

google_storage_bucket_iam_binding

resource "google_storage_bucket_iam_binding" "binding" {
  bucket = "your-bucket-name"
  role        = "roles/storage.objectViewer"

  members = [
    "user:[email protected]",
  ]
}

google_storage_bucket_iam_member

resource "google_storage_bucket_iam_member" "member" {
  bucket = "your-bucket-name"
  role        = "roles/storage.objectViewer"
  member      = "user:[email protected]"
}

google_storage_bucket_iam_policy

When applying a policy that does not include the roles listed below, you lose the default permissions which google adds to your bucket: * roles/storage.legacyBucketOwner * roles/storage.legacyBucketReader

If this happens only an entity with roles/storage.admin privileges can repair this bucket's policies. It is recommended to include the above roles in policies to get the same behaviour as with the other two options.

data "google_iam_policy" "foo-policy" {
  binding {
    role = "roles/your-role"

    members = [ "group:[email protected]" ]
  }
}

resource "google_storage_bucket_iam_policy" "member" {
  bucket = "your-bucket-name"
  policy_data = "${data.google_iam_policy.foo-policy.policy_data}"
}

Argument Reference

The following arguments are supported:

• bucket - (Required) The name of the bucket it applies to.

• member/members - (Required) Identities that will be granted the privilege in role. Each entry can have one of the following values:

  • allUsers: A special identifier that represents anyone who is on the internet; with or without a Google account.
  • allAuthenticatedUsers: A special identifier that represents anyone who is authenticated with a Google account or a service account.
  • user:{emailid}: An email address that represents a specific Google account. For example, [email protected] or [email protected].
  • serviceAccount:{emailid}: An email address that represents a service account. For example, [email protected].
  • group:{emailid}: An email address that represents a Google group. For example, [email protected].
  • domain:{domain}: A Google Apps domain name that represents all the users of that domain. For example, google.com or example.com.

• role - (Required) The role that should be applied. Note that custom roles must be of the format [projects|organizations]/{parent-name}/roles/{role-name}.

Attributes Reference

In addition to the arguments listed above, the following computed attributes are exported:

• etag - (Computed) The etag of the storage bucket's IAM policy.