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Identity-based policy examples for Amazon GameLift Streams - Amazon GameLift Streams
Policy best practicesUsing the consoleAllow users to view their own permissionsCreate and manage stream URLs

Identity-based policy examples for Amazon GameLift Streams

By default, users and roles don't have permission to create or modify Amazon GameLift Streams resources. To grant users permission to perform actions on the resources that they need, an IAM administrator can create IAM policies.

To learn how to create an IAM identity-based policy by using these example JSON policy documents, see Create IAM policies (console) in the IAM User Guide.

For details about actions and resource types defined by Amazon GameLift Streams, including the format of the ARNs for each of the resource types, see Actions, resources, and condition keys for Amazon GameLift Streams in the Service Authorization Reference.

Policy best practices

Identity-based policies determine whether someone can create, access, or delete Amazon GameLift Streams resources in your account. These actions can incur costs for your AWS account. When you create or edit identity-based policies, follow these guidelines and recommendations:

  • Get started with AWS managed policies and move toward least-privilege permissions – To get started granting permissions to your users and workloads, use the AWS managed policies that grant permissions for many common use cases. They are available in your AWS account. We recommend that you reduce permissions further by defining AWS customer managed policies that are specific to your use cases. For more information, see AWS managed policies or AWS managed policies for job functions 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 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 AWS service, such as CloudFormation. For more information, see IAM JSON policy elements: Condition 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 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 AWS 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 in the IAM User Guide.

For more information about best practices in IAM, see Security best practices in IAM in the IAM User Guide.

Using the Amazon GameLift Streams console

To access the Amazon GameLift Streams console, you must have a minimum set of permissions. These permissions must allow you to list and view details about the Amazon GameLift Streams resources in your AWS 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.

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

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "ViewOwnUserInfo",
            "Effect": "Allow",
            "Action": [
                "iam:GetUserPolicy",
                "iam:ListGroupsForUser",
                "iam:ListAttachedUserPolicies",
                "iam:ListUserPolicies",
                "iam:GetUser"
            ],
            "Resource": ["arn:aws: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": "*"
        }
    ]
}

Create and manage stream URLs

This example grants the least privilege required to create, monitor, and revoke stream URLs. CreateStreamUrl, GetStreamUrl, and RevokeStreamUrl are authorized against a stream group, so you scope them to stream group resource ARNs. A principal granted these permissions on a stream group can act on every stream URL in that stream group. You cannot scope these permissions to an individual stream URL. ListStreamUrls is account-scoped and returns stream URLs across your stream groups, so it takes Resource set to "*". In addition, CreateStreamUrl requires gameliftstreams:StartStreamSession permission for the application the stream URL points to, because activating the stream URL starts a stream session that runs that application. Scope this permission to the application resource ARN.

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "ManageStreamUrls",
      "Effect": "Allow",
      "Action": [
        "gameliftstreams:CreateStreamUrl",
        "gameliftstreams:GetStreamUrl",
        "gameliftstreams:RevokeStreamUrl"
      ],
      "Resource": "arn:aws:gameliftstreams:*:111122223333:streamgroup/*"
    },
    {
      "Sid": "StartSessionsForStreamUrls",
      "Effect": "Allow",
      "Action": "gameliftstreams:StartStreamSession",
      "Resource": "arn:aws:gameliftstreams:*:111122223333:application/*"
    },
    {
      "Sid": "ListStreamUrlsInAccount",
      "Effect": "Allow",
      "Action": "gameliftstreams:ListStreamUrls",
      "Resource": "*"
    }
  ]
}

If you pass an IAM role in RoleArn when you create a stream URL, also grant iam:PassRole for that role, scoped to Amazon GameLift Streams:

{
  "Sid": "PassRoleToStreamUrlSessions",
  "Effect": "Allow",
  "Action": "iam:PassRole",
  "Resource": "arn:aws:iam::111122223333:role/GameLiftStreams-MyStreamRole",
  "Condition": {
    "StringEquals": {
      "iam:PassedToService": "gameliftstreams.amazonaws.com"
    }
  }
}
Important

Because CreateStreamUrl freezes the stream URL's configuration (including an optional IAM role passed in RoleArn) at creation time, grant this permission only to trusted principals. Anyone who can create a stream URL can hand out unauthenticated, temporary access to a stream session.