# Amazon IoT identity-based policy examples
Identity-based policy examples

By default, IAM users and roles don't have permission to create or modify Amazon IoT resources. They also can't perform tasks using the Amazon Web Services Management Console, Amazon CLI, or Amazon API. An IAM administrator must create IAM policies that grant users and roles permission to perform specific API operations on the specified resources they need. The administrator must then attach those policies to the users or groups that require those permissions.

To learn how to create an IAM identity-based policy using these example JSON policy documents, see [Creating Policies on the JSON Tab](https://docs.amazonaws.cn/service-authorization/latest/reference/access_policies_create.html#access_policies_create-json-editor) in the *IAM User Guide*.

**Topics**
+ [

## Policy best practices
](#security_iam_service-with-iam-policy-best-practices)
+ [

## Using the Amazon IoT console
](#security_iam_id-based-policy-examples-console)
+ [

## Allow users to view their own permissions
](#security_iam_id-based-policy-examples-view-own-permissions)
+ [

## Viewing Amazon IoT resources based on tags
](#security_iam_id-based-policy-examples-view-thing-tags)
+ [

## Viewing Amazon IoT Device Advisor resources based on tags
](#security_iam-device-advisor-tags)

## Policy best practices


Identity-based policies determine whether someone can create, access, or delete Amazon IoT resources in your account. These actions can incur costs for your Amazon Web Services account. When you create or edit identity-based policies, follow these guidelines and recommendations:
+ **Get started with Amazon managed policies and move toward least-privilege permissions** – To get started granting permissions to your users and workloads, use the *Amazon managed policies* that grant permissions for many common use cases. They are available in your Amazon Web Services account. We recommend that you reduce permissions further by defining Amazon customer managed policies that are specific to your use cases. For more information, see [Amazon managed policies](https://docs.amazonaws.cn/IAM/latest/UserGuide/access_policies_managed-vs-inline.html#aws-managed-policies) or [Amazon managed policies for job functions](https://docs.amazonaws.cn/IAM/latest/UserGuide/access_policies_job-functions.html) in the *IAM User Guide*.
+ **Apply least-privilege permissions** – When you set permissions with IAM policies, grant only the permissions required to perform a task. You do this by defining the actions that can be taken on specific resources under specific conditions, also known as *least-privilege permissions*. For more information about using IAM to apply permissions, see [ Policies and permissions in IAM](https://docs.amazonaws.cn/IAM/latest/UserGuide/access_policies.html) in the *IAM User Guide*.
+ **Use conditions in IAM policies to further restrict access** – You can add a condition to your policies to limit access to actions and resources. For example, you can write a policy condition to specify that all requests must be sent using SSL. You can also use conditions to grant access to service actions if they are used through a specific Amazon Web Services service, such as Amazon CloudFormation. For more information, see [ IAM JSON policy elements: Condition](https://docs.amazonaws.cn/IAM/latest/UserGuide/reference_policies_elements_condition.html) in the *IAM User Guide*.
+ **Use IAM Access Analyzer to validate your IAM policies to ensure secure and functional permissions** – IAM Access Analyzer validates new and existing policies so that the policies adhere to the IAM policy language (JSON) and IAM best practices. IAM Access Analyzer provides more than 100 policy checks and actionable recommendations to help you author secure and functional policies. For more information, see [Validate policies with IAM Access Analyzer](https://docs.amazonaws.cn/IAM/latest/UserGuide/access-analyzer-policy-validation.html) in the *IAM User Guide*.
+ **Require multi-factor authentication (MFA)** – If you have a scenario that requires IAM users or a root user in your Amazon Web Services account, turn on MFA for additional security. To require MFA when API operations are called, add MFA conditions to your policies. For more information, see [ Secure API access with MFA](https://docs.amazonaws.cn/IAM/latest/UserGuide/id_credentials_mfa_configure-api-require.html) in the *IAM User Guide*.

For more information about best practices in IAM, see [Security best practices in IAM](https://docs.amazonaws.cn/IAM/latest/UserGuide/best-practices.html) in the *IAM User Guide*.

## Using the Amazon IoT console
Using the console

To access the Amazon IoT console, you must have a minimum set of permissions. These permissions must allow you to list and view details about the Amazon IoT resources in your Amazon Web Services account. If you create an identity-based policy that is more restrictive than the minimum required permissions, the console won't function as intended for entities (users or roles) with that policy.

To ensure that those entities can still use the Amazon IoT console, also attach the following Amazon managed policy to the entities: `AWSIoTFullAccess`. For more information, see [Adding Permissions to a User](https://docs.amazonaws.cn/service-authorization/latest/reference/id_users_change-permissions.html#users_change_permissions-add-console) in the *IAM User Guide*.

You don't need to allow minimum console permissions for users that are making calls only to the Amazon CLI or the Amazon API. Instead, allow access to only the actions that match the API operation that you're trying to perform.

## Allow users to view their own permissions


This example shows how you might create a policy that allows IAM users to view the inline and managed policies that are attached to their user identity. This policy includes permissions to complete this action on the console or programmatically using the Amazon CLI or Amazon API.

```
{
    "Version": "2012-10-17",		 	 	 
    "Statement": [
        {
            "Sid": "ViewOwnUserInfo",
            "Effect": "Allow",
            "Action": [
                "iam:GetUserPolicy",
                "iam:ListGroupsForUser",
                "iam:ListAttachedUserPolicies",
                "iam:ListUserPolicies",
                "iam:GetUser"
            ],
            "Resource": ["arn:aws-cn:iam::*:user/${aws:username}"]
        },
        {
            "Sid": "NavigateInConsole",
            "Effect": "Allow",
            "Action": [
                "iam:GetGroupPolicy",
                "iam:GetPolicyVersion",
                "iam:GetPolicy",
                "iam:ListAttachedGroupPolicies",
                "iam:ListGroupPolicies",
                "iam:ListPolicyVersions",
                "iam:ListPolicies",
                "iam:ListUsers"
            ],
            "Resource": "*"
        }
    ]
}
```

## Viewing Amazon IoT resources based on tags


You can use conditions in your identity-based policy to control access to Amazon IoT resources based on tags. This example shows how you might create a policy that allows viewing a thing. However, permission is granted only if the thing tag `Owner` has the value of that user's user name. This policy also grants the permissions necessary to complete this action on the console.

****  

```
{
    "Version":"2012-10-17",		 	 	 
    "Statement": [
        {
            "Sid": "ListBillingGroupsInConsole",
            "Effect": "Allow",
            "Action": "iot:ListBillingGroups",
            "Resource": "*"
        },
        {
            "Sid": "ViewBillingGroupsIfOwner",
            "Effect": "Allow",
           "Action": "iot:DescribeBillingGroup",
            "Resource": "arn:aws-cn:iot:*:*:billinggroup/*",
            "Condition": {
                "StringEquals": {"aws:ResourceTag/Owner": "${aws:username}"}
        }
        }
    ]
}
```

You can attach this policy to the IAM users in your account. If a user named `richard-roe` attempts to view an Amazon IoT billing group, the billing group must be tagged `Owner=richard-roe` or `owner=richard-roe`. Otherwise, he is denied access. The condition tag key `Owner` matches both `Owner` and `owner` because condition key names are not case-sensitive. For more information, see [IAM JSON Policy Elements: Condition](https://docs.amazonaws.cn/service-authorization/latest/reference/reference_policies_elements_condition.html) in the *IAM User Guide*.

## Viewing Amazon IoT Device Advisor resources based on tags


You can use conditions in your identity-based policy to control access to Amazon IoT Device Advisor resources based on tags. The following example shows how you can create a policy that allows viewing a particular suite definition. However, permission is granted only if the suite definition tag has `SuiteType` set to the value of `MQTT`. This policy also grants the permissions necessary to complete this action on the console.

****  

```
{
    "Version":"2012-10-17",		 	 	 
    "Statement": [
        {
            "Sid": "ViewSuiteDefinition",
            "Effect": "Allow",
            "Action": "iotdeviceadvisor:GetSuiteDefinition",
            "Resource": "arn:aws-cn:iotdeviceadvisor:*:*:suitedefinition/*",
            "Condition": {
                "StringEquals": {"aws:ResourceTag/SuiteType": "MQTT"}
        }
        }
    ]
}
```