# How AWS End User Messaging SMS works with IAM
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Before you use IAM to manage access to AWS End User Messaging SMS, learn what IAM features are available to use with AWS End User Messaging SMS.






**IAM features you can use with AWS End User Messaging SMS**  

| IAM feature | AWS End User Messaging SMS support | 
| --- | --- | 
|  [Identity-based policies](#security_iam_service-with-iam-id-based-policies)  |   Yes  | 
|  [Resource-based policies](#security_iam_service-with-iam-resource-based-policies)  |   No   | 
|  [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](#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  | 
|  [Forward access sessions (FAS)](#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)  |   Yes  | 

To get a high-level view of how AWS End User Messaging SMS and other AWS services work with most IAM features, see [AWS services that work with IAM](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_aws-services-that-work-with-iam.html) in the *IAM User Guide*.

## Identity-based policies for AWS End User Messaging SMS
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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.aws.amazon.com/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.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements.html) in the *IAM User Guide*.

### Identity-based policy examples for AWS End User Messaging SMS
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To view examples of AWS End User Messaging SMS identity-based policies, see [Identity-based policy examples for AWS End User Messaging SMS](security_iam_id-based-policy-examples.md).

## Resource-based policies within AWS End User Messaging SMS
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**Supports resource-based policies:** No 

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.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements_principal.html) in a resource-based policy. Principals can include accounts, users, roles, federated users, or AWS 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.aws.amazon.com/IAM/latest/UserGuide/access_policies-cross-account-resource-access.html) in the *IAM User Guide*.

## Policy actions for AWS End User Messaging SMS
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**Supports policy actions:** Yes

Administrators can use AWS 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 AWS End User Messaging SMS actions, see [Actions Defined by AWS End User Messaging SMS ](https://docs.aws.amazon.com/IAM/latest/UserGuide/list_amazonpinpointsmsvoicev2.html#amazonpinpointsmsvoicev2-actions-as-permissions) in the *Service Authorization Reference*.

Policy actions in AWS End User Messaging SMS use the following prefix before the action:

```
sms-voice
```

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

```
"Action": [
      "sms-voice:action1",
      "sms-voice:action2"
         ]
```





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

```
"Action": "sms-voice:Describe*"
```



To see a list of AWS End User Messaging SMS actions, see [Actions Defined by AWS End User Messaging SMS ](https://docs.aws.amazon.com/IAM/latest/UserGuide/list_amazonpinpointsmsvoicev2.html#amazonpinpointsmsvoicev2-actions-as-permissions) in the *IAM User Guide*.

However, as a best practice, you should create policies that follow the principle of *least privilege*. In other words, you should create policies that include only the permissions that are required to perform a specific action.

For a list of AWS End User Messaging SMS actions that you can use in IAM policies, see [AWS End User Messaging SMS actions for IAM policies](permissions-actions.md).

To view examples of AWS End User Messaging SMS identity-based policies, see [Identity-based policy examples for AWS End User Messaging SMS](security_iam_id-based-policy-examples.md).

## Policy resources for AWS End User Messaging SMS
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**Supports policy resources:** Yes

Administrators can use AWS 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.aws.amazon.com/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": "*"
```

To see a list of AWS End User Messaging SMS resource types and their ARNs, see [Resources Defined by AWS End User Messaging SMS ](https://docs.aws.amazon.com/IAM/latest/UserGuide/list_amazonpinpointsmsvoicev2.html#amazonpinpointsmsvoicev2-resources-for-iam-policies) in the *Service Authorization Reference*. To learn with which actions you can specify the ARN of each resource, see [Actions Defined by AWS End User Messaging SMS ](https://docs.aws.amazon.com/IAM/latest/UserGuide/list_amazonpinpointsmsvoicev2.html#amazonpinpointsmsvoicev2-actions-as-permissions).

To view examples of AWS End User Messaging SMS identity-based policies, see [Identity-based policy examples for AWS End User Messaging SMS](security_iam_id-based-policy-examples.md).

Some AWS End User Messaging SMS actions, such as certain actions for creating resources, can't be performed on a specific resource. In those cases, you must use the wildcard (\$1):

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

 In IAM policies, you can also specify ARNs for the following types of SMS and Voice resources: 
+ Configuration Set
+ Opt Out List
+ Phone Number
+ Pool
+ Registration
+ Registration attachment
+ Sender Id
+ Verified destination phone number

For example, to create a policy statement for a phone number that has the phone number ID `phone-12345678901234567890123456789012` use the following ARN: 

```
"Resource": "arn:aws:sms-voice:us-east-1:123456789012:phone-number/phone-12345678901234567890123456789012"
```

To specify all phone numbers that belong to a specific account, use a wildcard (\$1) in place of the phone number ID:

```
"Resource": "arn:aws:sms-voice:us-east-1:123456789012:phone-number/*"
```

Some AWS End User Messaging SMS and Voice actions are not performed on a specific resource, such as those for managing account-level settings like spend limits. In those cases, you must use the wildcard (\$1):

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

## Policy condition keys for AWS End User Messaging SMS
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**Supports service-specific policy condition keys:** Yes

Administrators can use AWS 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.aws.amazon.com/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 AWS global condition keys, see [AWS global condition context keys](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_condition-keys.html) in the *IAM User Guide*.

To see a list of AWS End User Messaging SMS condition keys, see [Condition Keys for AWS End User Messaging SMS ](https://docs.aws.amazon.com/IAM/latest/UserGuide/list_amazonpinpointsmsvoicev2.html#amazonpinpointsmsvoicev2-policy-keys) in the *Service Authorization Reference*. To learn with which actions and resources you can use a condition key, see [Actions Defined by AWS End User Messaging SMS ](https://docs.aws.amazon.com/IAM/latest/UserGuide/list_amazonpinpointsmsvoicev2.html#amazonpinpointsmsvoicev2-actions-as-permissions).

To view examples of AWS End User Messaging SMS identity-based policies, see [Identity-based policy examples for AWS End User Messaging SMS](security_iam_id-based-policy-examples.md).

AWS End User Messaging SMS defines its own set of condition keys and also supports some global condition keys. To see a list of all AWS global condition keys, see [AWS global condition context keys](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_condition-keys.html) in the *IAM User Guide*. To see a list of AWS End User Messaging SMS condition keys, see [Condition Keys for AWS End User Messaging SMS ](https://docs.aws.amazon.com/IAM/latest/UserGuide/list_amazonpinpointsmsvoicev2.html#amazonpinpointsmsvoicev2-policy-keys) in the *IAM User Guide*. To learn which actions and resources you can use a condition key with, see [Actions Defined by AWS End User Messaging SMS ](https://docs.aws.amazon.com/IAM/latest/UserGuide/list_amazonpinpointsmsvoicev2.html#amazonpinpointsmsvoicev2-actions-as-permissions) in the *IAM User Guide*.

## ACLs in AWS End User Messaging SMS
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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 AWS End User Messaging SMS
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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 AWS 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.aws.amazon.com/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.aws.amazon.com/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.aws.amazon.com/IAM/latest/UserGuide/tutorial_attribute-based-access-control.html) in the *IAM User Guide*.

## Using temporary credentials with AWS End User Messaging SMS
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**Supports temporary credentials:** Yes

Temporary credentials provide short-term access to AWS resources and are automatically created when you use federation or switch roles. AWS 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.aws.amazon.com/IAM/latest/UserGuide/id_credentials_temp.html) and [AWS services that work with IAM](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_aws-services-that-work-with-iam.html) in the *IAM User Guide*.

## Forward access sessions for AWS End User Messaging SMS
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**Supports forward access sessions (FAS):** No 

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

## Service roles for AWS End User Messaging SMS
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**Supports service roles:** Yes

 A service role is an [IAM role](https://docs.aws.amazon.com/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 AWS service](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_create_for-service.html) in the *IAM User Guide*. 

**Warning**  
Changing the permissions for a service role might break AWS End User Messaging SMS functionality. Edit service roles only when AWS End User Messaging SMS provides guidance to do so.

## Service-linked roles for AWS End User Messaging SMS
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**Supports service-linked roles:** Yes

 A service-linked role is a type of service role that is linked to an AWS service. The service can assume the role to perform an action on your behalf. Service-linked roles appear in your AWS 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 [AWS services that work with IAM](https://docs.aws.amazon.com/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.