# How Amazon Glue works with IAM
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Before you use IAM to manage access to Amazon Glue, learn what IAM features are available to use with Amazon Glue.






**IAM features you can use with Amazon Glue**  

| IAM feature | Amazon Glue support | 
| --- | --- | 
|  [Identity-based policies](#security_iam_service-with-iam-id-based-policies)  |   Yes  | 
|  [Resource-based policies](#security_iam_service-with-iam-resource-based-policies)  |   Partial  | 
|  [Policy actions](#security_iam_service-with-iam-id-based-policies-actions)  |   Yes  | 
|  [Policy resources](#security_iam_service-with-iam-id-based-policies-resources)  |   Yes  | 
|  [Policy condition keys (service-specific)](#security_iam_service-with-iam-id-based-policies-conditionkeys)  |   Yes  | 
|  [ACLs](#security_iam_service-with-iam-acls)  |   No   | 
|  [ABAC (tags in policies)](#security_iam_service-with-iam-tags)  |   Partial  | 
|  [Temporary credentials](#security_iam_service-with-iam-roles-tempcreds)  |   Yes  | 
|  [Principal permissions](#security_iam_service-with-iam-principal-permissions)  |   No   | 
|  [Service roles](#security_iam_service-with-iam-roles-service)  |   Yes  | 
|  [Service-linked roles](#security_iam_service-with-iam-roles-service-linked)  |   No   | 

To get a high-level view of how Amazon Glue and other Amazon services work with most IAM features, see [Amazon services that work with IAM](https://docs.amazonaws.cn/IAM/latest/UserGuide/reference_aws-services-that-work-with-iam.html) in the *IAM User Guide*.

## Identity-based policies for Amazon Glue
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**Supports identity-based policies:** Yes

Identity-based policies are JSON permissions policy documents that you can attach to an identity, such as an IAM user, group of users, or role. These policies control what actions users and roles can perform, on which resources, and under what conditions. To learn how to create an identity-based policy, see [Define custom IAM permissions with customer managed policies](https://docs.amazonaws.cn/IAM/latest/UserGuide/access_policies_create.html) in the *IAM User Guide*.

With IAM identity-based policies, you can specify allowed or denied actions and resources as well as the conditions under which actions are allowed or denied. To learn about all of the elements that you can use in a JSON policy, see [IAM JSON policy elements reference](https://docs.amazonaws.cn/IAM/latest/UserGuide/reference_policies_elements.html) in the *IAM User Guide*.

Amazon Glue supports identity-based policies (IAM policies) for all Amazon Glue operations. By attaching a policy, you can grant permissions to create, access, or modify an Amazon Glue resource, such as a table in the Amazon Glue Data Catalog.

### Identity-based policy examples for Amazon Glue
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To view examples of Amazon Glue identity-based policies, see [Identity-based policy examples for Amazon Glue](security_iam_id-based-policy-examples.md).

## Resource-based policies within Amazon Glue
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**Supports resource-based policies:** Partial

Resource-based policies are JSON policy documents that you attach to a resource. Examples of resource-based policies are IAM *role trust policies* and Amazon S3 *bucket policies*. In services that support resource-based policies, service administrators can use them to control access to a specific resource. For the resource where the policy is attached, the policy defines what actions a specified principal can perform on that resource and under what conditions. You must [specify a principal](https://docs.amazonaws.cn/IAM/latest/UserGuide/reference_policies_elements_principal.html) in a resource-based policy. Principals can include accounts, users, roles, federated users, or Amazon Web Services services.

To enable cross-account access, you can specify an entire account or IAM entities in another account as the principal in a resource-based policy. For more information, see [Cross account resource access in IAM](https://docs.amazonaws.cn/IAM/latest/UserGuide/access_policies-cross-account-resource-access.html) in the *IAM User Guide*.

**Note**  
You can only use an Amazon Glue resource policy to manage permissions for Data Catalog resources. You can't attach it to any other Amazon Glue resources such as jobs, triggers, development endpoints, crawlers, or classifiers.  
Only *one* resource policy is allowed per catalog, and its size is limited to 10 KB.

In Amazon Glue, a resource policy is attached to a *catalog*, which is a virtual container for all the kinds of Data Catalog resources mentioned previously. Each Amazon account owns a single catalog in an Amazon Region whose catalog ID is the same as the Amazon account ID. You cannot delete or modify a catalog.

A resource policy is evaluated for all API calls to the catalog where the caller principal is included in the `"Principal"` block of the policy document.



To view examples of Amazon Glue resource-based policies, see [Resource-based policy examples for Amazon Glue](security_iam_resource-based-policy-examples.md).

## Policy actions for Amazon Glue
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**Supports policy actions:** Yes

Administrators can use Amazon JSON policies to specify who has access to what. That is, which **principal** can perform **actions** on what **resources**, and under what **conditions**.

The `Action` element of a JSON policy describes the actions that you can use to allow or deny access in a policy. Include actions in a policy to grant permissions to perform the associated operation.



To see a list of Amazon Glue actions, see [Actions defined by Amazon Glue](https://docs.amazonaws.cn/service-authorization/latest/reference/list_awsglue.html#awsglue-actions-as-permissions) in the *Service Authorization Reference*.

Policy actions in Amazon Glue use the following prefix before the action:

```
glue
```

To specify multiple actions in a single statement, separate them with commas.

```
"Action": [
      "glue:action1",
      "glue:action2"
         ]
```





You can specify multiple actions using wildcards (\$1). For example, to specify all actions that begin with the word `Get`, include the following action:

```
"Action": "glue:Get*"
```

To view example policies, see [Amazon Glue access control policy examples](glue-policy-examples.md).

## Policy resources for Amazon Glue
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**Supports policy resources:** Yes

Administrators can use Amazon JSON policies to specify who has access to what. That is, which **principal** can perform **actions** on what **resources**, and under what **conditions**.

The `Resource` JSON policy element specifies the object or objects to which the action applies. As a best practice, specify a resource using its [Amazon Resource Name (ARN)](https://docs.amazonaws.cn/IAM/latest/UserGuide/reference-arns.html). For actions that don't support resource-level permissions, use a wildcard (\$1) to indicate that the statement applies to all resources.

```
"Resource": "*"
```

For more information about how to control access to Amazon Glue resources using ARNs, see [Specifying Amazon Glue resource ARNs](glue-specifying-resource-arns.md).

To see a list of Amazon Glue resource types and their ARNs, see [Resources defined by Amazon Glue](https://docs.amazonaws.cn/service-authorization/latest/reference/list_awsglue.html#awsglue-resources-for-iam-policies) in the *Service Authorization Reference*. To learn which actions you can use to specify the ARN of each resource, see [Actions defined by Amazon Glue](https://docs.amazonaws.cn/service-authorization/latest/reference/list_awsglue.html#awsglue-actions-as-permissions).



## Policy condition keys for Amazon Glue
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**Supports service-specific policy condition keys:** Yes

Administrators can use Amazon JSON policies to specify who has access to what. That is, which **principal** can perform **actions** on what **resources**, and under what **conditions**.

The `Condition` element specifies when statements execute based on defined criteria. You can create conditional expressions that use [condition operators](https://docs.amazonaws.cn/IAM/latest/UserGuide/reference_policies_elements_condition_operators.html), such as equals or less than, to match the condition in the policy with values in the request. To see all Amazon global condition keys, see [Amazon global condition context keys](https://docs.amazonaws.cn/IAM/latest/UserGuide/reference_policies_condition-keys.html) in the *IAM User Guide*.

To see a list of Amazon Glue condition keys, see [Condition keys for Amazon Glue](https://docs.amazonaws.cn/service-authorization/latest/reference/list_awsglue.html#awsglue-policy-keys) in the *Service Authorization Reference*. To learn which actions and resources you can use a condition key with, see [Actions defined by Amazon Glue](https://docs.amazonaws.cn/service-authorization/latest/reference/list_awsglue.html#awsglue-actions-as-permissions).

To view example policies, see [Control settings using condition keys or context keys](security_iam_id-based-policy-examples.md#glue-identity-based-policy-condition-keys).

## ACLs in Amazon Glue
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**Supports ACLs:** No 

Access control lists (ACLs) control which principals (account members, users, or roles) have permissions to access a resource. ACLs are similar to resource-based policies, although they do not use the JSON policy document format.

## ABAC with Amazon Glue
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**Supports ABAC (tags in policies):** Partial

Attribute-based access control (ABAC) is an authorization strategy that defines permissions based on attributes called tags. You can attach tags to IAM entities and Amazon resources, then design ABAC policies to allow operations when the principal's tag matches the tag on the resource.

To control access based on tags, you provide tag information in the [condition element](https://docs.amazonaws.cn/IAM/latest/UserGuide/reference_policies_elements_condition.html) of a policy using the `aws:ResourceTag/key-name`, `aws:RequestTag/key-name`, or `aws:TagKeys` condition keys.

If a service supports all three condition keys for every resource type, then the value is **Yes** for the service. If a service supports all three condition keys for only some resource types, then the value is **Partial**.

For more information about ABAC, see [Define permissions with ABAC authorization](https://docs.amazonaws.cn/IAM/latest/UserGuide/introduction_attribute-based-access-control.html) in the *IAM User Guide*. To view a tutorial with steps for setting up ABAC, see [Use attribute-based access control (ABAC)](https://docs.amazonaws.cn/IAM/latest/UserGuide/tutorial_attribute-based-access-control.html) in the *IAM User Guide*.

**Important**  
The condition context keys apply only to Amazon Glue API actions on crawlers, jobs, triggers, and development endpoints. For more information about which API operations are affected, see [Condition keys for Amazon Glue](https://docs.amazonaws.cn/service-authorization/latest/reference/list_awsglue.html#awsglue-policy-keys).  
The Amazon Glue Data Catalog API operations don't currently support the `aws:referer` and `aws:UserAgent` global condition context keys.

To view an example identity-based policy for limiting access to a resource based on the tags on that resource, see [Grant access using tags](security_iam_id-based-policy-examples.md#tags-control-access-example-triggers-allow).

## Using temporary credentials with Amazon Glue
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**Supports temporary credentials:** Yes

Temporary credentials provide short-term access to Amazon resources and are automatically created when you use federation or switch roles. Amazon recommends that you dynamically generate temporary credentials instead of using long-term access keys. For more information, see [Temporary security credentials in IAM](https://docs.amazonaws.cn/IAM/latest/UserGuide/id_credentials_temp.html) and [Amazon Web Services services that work with IAM](https://docs.amazonaws.cn/IAM/latest/UserGuide/reference_aws-services-that-work-with-iam.html) in the *IAM User Guide*.

## Cross-service principal permissions for Amazon Glue
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**Supports forward access sessions (FAS):** No 

 Forward access sessions (FAS) use the permissions of the principal calling an Amazon Web Services service, combined with the requesting Amazon Web Services service to make requests to downstream services. For policy details when making FAS requests, see [Forward access sessions](https://docs.amazonaws.cn/IAM/latest/UserGuide/access_forward_access_sessions.html). 

## Service roles for Amazon Glue
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**Supports service roles:** Yes

 A service role is an [IAM role](https://docs.amazonaws.cn/IAM/latest/UserGuide/id_roles.html) that a service assumes to perform actions on your behalf. An IAM administrator can create, modify, and delete a service role from within IAM. For more information, see [Create a role to delegate permissions to an Amazon Web Services service](https://docs.amazonaws.cn/IAM/latest/UserGuide/id_roles_create_for-service.html) in the *IAM User Guide*. 

**Warning**  
Changing the permissions for a service role might break Amazon Glue functionality. Edit service roles only when Amazon Glue provides guidance to do so.

For detailed instructions on creating a service role for Amazon Glue, see [Step 1: Create an IAM policy for the Amazon Glue service](create-service-policy.md) and [Step 2: Create an IAM role for Amazon Glue](create-an-iam-role.md).

## Service-linked roles for Amazon Glue
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**Supports service-linked roles:** No 

 A service-linked role is a type of service role that is linked to an Amazon Web Services service. The service can assume the role to perform an action on your behalf. Service-linked roles appear in your Amazon Web Services account and are owned by the service. An IAM administrator can view, but not edit the permissions for service-linked roles. 

For details about creating or managing service-linked roles, see [Amazon services that work with IAM](https://docs.amazonaws.cn/IAM/latest/UserGuide/reference_aws-services-that-work-with-iam.html). Find a service in the table that includes a `Yes` in the **Service-linked role** column. Choose the **Yes** link to view the service-linked role documentation for that service.