# Identity and access management for AWS RTB Fabric AWS Identity and Access Management (IAM) is an AWS service that helps an administrator securely control access to AWS resources. IAM administrators control who can be *authenticated* (signed in) and *authorized* (have permissions) to use RTB Fabric resources. IAM is an AWS service that you can use with no additional charge. **Topics** + [Audience](#security_iam_audience) + [Authenticating with identities](#security_iam_authentication) + [Managing access using policies](#security_iam_access-manage) + [How RTB Fabric works with IAM](security_iam_service-with-iam.md) + [Identity-based policy examples for RTB Fabric](security_iam_id-based-policy-examples.md) + [AWS managed policies for AWS RTB Fabric](security-iam-awsmanpol.md) + [Troubleshooting RTB Fabric identity and access](security_iam_troubleshoot.md) + [Using service-linked roles for RTB Fabric](using-service-linked-roles.md) ## Audience How you use AWS Identity and Access Management (IAM) differs based on your role: + **Service user** - request permissions from your administrator if you cannot access features (see [Troubleshooting RTB Fabric identity and access](security_iam_troubleshoot.md)) + **Service administrator** - determine user access and submit permission requests (see [How RTB Fabric works with IAM](security_iam_service-with-iam.md)) + **IAM administrator** - write policies to manage access (see [Identity-based policy examples for RTB Fabric](security_iam_id-based-policy-examples.md)) ## Authenticating with identities Authentication is how you sign in to AWS using your identity credentials. You must be authenticated as the AWS account root user, an IAM user, or by assuming an IAM role. You can sign in as a federated identity using credentials from an identity source like AWS IAM Identity Center (IAM Identity Center), single sign-on authentication, or Google/Facebook credentials. For more information about signing in, see [How to sign in to your AWS account](https://docs.aws.amazon.com/signin/latest/userguide/how-to-sign-in.html) in the *AWS Sign-In User Guide*. For programmatic access, AWS provides an SDK and CLI to cryptographically sign requests. For more information, see [AWS Signature Version 4 for API requests](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_sigv.html) in the *IAM User Guide*. ### AWS account root user When you create an AWS account, you begin with one sign-in identity called the AWS account *root user* that has complete access to all AWS services and resources. We strongly recommend that you don't use the root user for everyday tasks. For tasks that require root user credentials, see [Tasks that require root user credentials](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_root-user.html#root-user-tasks) in the *IAM User Guide*. ### Federated identity As a best practice, require human users to use federation with an identity provider to access AWS services using temporary credentials. A *federated identity* is a user from your enterprise directory, web identity provider, or Directory Service that accesses AWS services using credentials from an identity source. Federated identities assume roles that provide temporary credentials. For centralized access management, we recommend AWS IAM Identity Center. For more information, see [What is IAM Identity Center?](https://docs.aws.amazon.com/singlesignon/latest/userguide/what-is.html) in the *AWS IAM Identity Center User Guide*. ### IAM users and groups An *[IAM user](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_users.html)* is an identity with specific permissions for a single person or application. We recommend using temporary credentials instead of IAM users with long-term credentials. For more information, see [Require human users to use federation with an identity provider to access AWS using temporary credentials](https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html#bp-users-federation-idp) in the *IAM User Guide*. An [https://docs.aws.amazon.com/IAM/latest/UserGuide/id_groups.html](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_groups.html) specifies a collection of IAM users and makes permissions easier to manage for large sets of users. For more information, see [Use cases for IAM users](https://docs.aws.amazon.com/IAM/latest/UserGuide/gs-identities-iam-users.html) in the *IAM User Guide*. ### IAM roles An *[IAM role](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles.html)* is an identity with specific permissions that provides temporary credentials. You can assume a role by [switching from a user to an IAM role (console)](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_use_switch-role-console.html) or by calling an AWS CLI or AWS API operation. For more information, see [Methods to assume a role](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_manage-assume.html) in the *IAM User Guide*. IAM roles are useful for federated user access, temporary IAM user permissions, cross-account access, cross-service access, and applications running on Amazon EC2. 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*. ## Managing access using policies You control access in AWS by creating policies and attaching them to AWS identities or resources. A policy defines permissions when associated with an identity or resource. AWS evaluates these policies when a principal makes a request. Most policies are stored in AWS as JSON documents. For more information about JSON policy documents, see [Overview of JSON policies](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies.html#access_policies-json) in the *IAM User Guide*. Using policies, administrators specify who has access to what by defining which **principal** can perform **actions** on what **resources**, and under what **conditions**. By default, users and roles have no permissions. An IAM administrator creates IAM policies and adds them to roles, which users can then assume. IAM policies define permissions regardless of the method used to perform the operation. ### Identity-based policies Identity-based policies are JSON permissions policy documents that you attach to an identity (user, group, or role). These policies control what actions identities 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*. Identity-based policies can be *inline policies* (embedded directly into a single identity) or *managed policies* (standalone policies attached to multiple identities). To learn how to choose between managed and inline policies, see [Choose between managed policies and inline policies](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies-choosing-managed-or-inline.html) in the *IAM User Guide*. ### Resource-based policies Resource-based policies are JSON policy documents that you attach to a resource. Examples include 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. You must [specify a principal](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements_principal.html) in a resource-based policy. Resource-based policies are inline policies that are located in that service. You can't use AWS managed policies from IAM in a resource-based policy. ### Other policy types AWS supports additional policy types that can set the maximum permissions granted by more common policy types: + **Permissions boundaries** – Set the maximum permissions that an identity-based policy can grant to an IAM entity. For more information, see [Permissions boundaries for IAM entities](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies_boundaries.html) in the *IAM User Guide*. + **Service control policies (SCPs)** – Specify the maximum permissions for an organization or organizational unit in AWS Organizations. For more information, see [Service control policies](https://docs.aws.amazon.com/organizations/latest/userguide/orgs_manage_policies_scps.html) in the *AWS Organizations User Guide*. + **Resource control policies (RCPs)** – Set the maximum available permissions for resources in your accounts. For more information, see [Resource control policies (RCPs)](https://docs.aws.amazon.com/organizations/latest/userguide/orgs_manage_policies_rcps.html) in the *AWS Organizations User Guide*. + **Session policies** – Advanced policies passed as a parameter when creating a temporary session for a role or federated user. For more information, see [Session policies](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies.html#policies_session) in the *IAM User Guide*. ### Multiple policy types When multiple types of policies apply to a request, the resulting permissions are more complicated to understand. To learn how AWS determines whether to allow a request when multiple policy types are involved, see [Policy evaluation logic](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_evaluation-logic.html) in the *IAM User Guide*. # How RTB Fabric works with IAM Before you use IAM to manage access to RTB Fabric, learn what IAM features are available to use with RTB Fabric. | IAM feature | RTB Fabric 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) | Yes | | [Temporary credentials](#security_iam_service-with-iam-roles-tempcreds) | Yes | | [Principal permissions](#security_iam_service-with-iam-principal-permissions) | Yes | | [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 RTB Fabric 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 RTB Fabric **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 RTB Fabric To view examples of RTB Fabric identity-based policies, see [Identity-based policy examples for RTB Fabric](security_iam_id-based-policy-examples.md). ## Resource-based policies within RTB Fabric **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 RTB Fabric **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 RTB Fabric actions, see Actions, resources, and condition keys for RTB Fabric in the *Service Authorization Reference*. Policy actions in RTB Fabric use the following prefix before the action: ``` rtbfabric ``` To specify multiple actions in a single statement, separate them with commas. ``` "Action": [ "rtbfabric:action1", "rtbfabric:action2" ] ``` To view examples of RTB Fabric identity-based policies, see [Identity-based policy examples for RTB Fabric](security_iam_id-based-policy-examples.md). ## Policy resources for RTB Fabric **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 RTB Fabric resource types and their ARNs, see Actions, resources, and condition keys for RTB Fabric in the *Service Authorization Reference*. To learn with which actions you can specify the ARN of each resource, see Actions, resources, and condition keys for RTB Fabric. To view examples of RTB Fabric identity-based policies, see [Identity-based policy examples for RTB Fabric](security_iam_id-based-policy-examples.md). ## Policy condition keys for RTB Fabric **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 RTB Fabric condition keys, see Actions, resources, and condition keys for RTB Fabric in the *Service Authorization Reference*. To learn with which actions and resources you can use a condition key, see Actions, resources, and condition keys for RTB Fabric. To view examples of RTB Fabric identity-based policies, see [Identity-based policy examples for RTB Fabric](security_iam_id-based-policy-examples.md). ## ACLs in RTB Fabric **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 RTB Fabric **Supports ABAC (tags in policies):** Yes 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 RTB Fabric **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*. ## Cross-service principal permissions for RTB Fabric **Supports forward access sessions (FAS):** Yes 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 RTB Fabric **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 RTB Fabric functionality. Edit service roles only when RTB Fabric provides guidance to do so. ## Service-linked roles for RTB Fabric **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. # Identity-based policy examples for RTB Fabric By default, users and roles don't have permission to create or modify RTB Fabric 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)](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies_create-console.html) in the *IAM User Guide*. For details about actions and resource types defined by RTB Fabric, including the format of the ARNs for each of the resource types, see [Actions, Resources, and Condition Keys for AWS RTB Fabric](https://docs.aws.amazon.com/IAM/latest/UserGuide/list_rtbfabric.html) in the *Service Authorization Reference*. **Topics** + [Policy best practices](#security_iam_service-with-iam-policy-best-practices) + [Using the RTB Fabric console](#security_iam_id-based-policy-examples-console) + [Allow users to view their own permissions](#security_iam_id-based-policy-examples-view-own-permissions) + [Basic RTB Fabric permissions](#security_iam_id-based-policy-examples-rtb-basic) + [RTB Fabric administrator permissions](#security_iam_id-based-policy-examples-rtb-admin) + [RTB Fabric read-only permissions](#security_iam_id-based-policy-examples-rtb-readonly) ## Policy best practices Identity-based policies determine whether someone can create, access, or delete RTB Fabric 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](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies_managed-vs-inline.html#aws-managed-policies) or [AWS managed policies for job functions](https://docs.aws.amazon.com/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.aws.amazon.com/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 AWS service, such as CloudFormation. For more information, see [ IAM JSON policy elements: Condition](https://docs.aws.amazon.com/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.aws.amazon.com/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 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](https://docs.aws.amazon.com/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.aws.amazon.com/IAM/latest/UserGuide/best-practices.html) in the *IAM User Guide*. ## Using the RTB Fabric console To access the AWS RTB Fabric console, you must have a minimum set of permissions. These permissions must allow you to list and view details about the RTB Fabric 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. To ensure that users and roles can still use the RTB Fabric console, also attach the RTB Fabric `ReadOnly` permissions to the entities. For more information, see [Adding permissions to a user](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_users_change-permissions.html#users_change_permissions-add-console) in the *IAM User Guide*. Users who need console access require the following permissions: ``` { "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "rtbfabric:GetRequesterGateway", "rtbfabric:GetResponderGateway", "rtbfabric:ListRequesterGateways", "rtbfabric:ListResponderGateways", "rtbfabric:GetLink", "rtbfabric:ListLinks", "ec2:DescribeNetworkInterfaces", "ec2:DescribeSubnets", "ec2:DescribeSecurityGroups", "ec2:DescribeVpcs" ], "Resource": "*" } ] } ``` ## 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/${aws:username}"] }, { "Sid": "NavigateInConsole", "Effect": "Allow", "Action": [ "iam:GetGroupPolicy", "iam:GetPolicyVersion", "iam:GetPolicy", "iam:ListAttachedGroupPolicies", "iam:ListGroupPolicies", "iam:ListPolicyVersions", "iam:ListPolicies", "iam:ListUsers" ], "Resource": "*" } ] } ``` ## Basic RTB Fabric permissions This example shows a policy that allows basic RTB Fabric operations including creating, viewing, and managing RTB applications and links. ``` { "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "rtbfabric:CreateRequesterGateway", "rtbfabric:CreateResponderGateway", "rtbfabric:DeleteRequesterGateway", "rtbfabric:DeleteResponderGateway", "rtbfabric:GetRequesterGateway", "rtbfabric:GetResponderGateway", "rtbfabric:ListRequesterGateways", "rtbfabric:ListResponderGateways", "rtbfabric:CreateLink", "rtbfabric:DeleteLink", "rtbfabric:GetLink", "rtbfabric:ListLinks", "rtbfabric:AcceptLink", "rtbfabric:RejectLink" ], "Resource": [ "arn:aws:rtbfabric:*:*:gateway/*", "arn:aws:rtbfabric:*:*:link/*" ] } ] } ``` This policy grants permissions to perform common RTB Fabric operations on RTB applications and links in any region within your AWS account. ## RTB Fabric administrator permissions This example shows a policy that allows full administrative access to RTB Fabric, including the ability to view network interfaces managed by the service. For additional security, consider scoping the CloudWatch Get actions to specific metric resources rather than using wildcard (\$1) resources, depending on your monitoring requirements. ``` { "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "rtbfabric:*" ], "Resource": "*" }, { "Effect": "Allow", "Action": [ "ec2:DescribeNetworkInterfaces", "ec2:DescribeSubnets", "ec2:DescribeSecurityGroups", "ec2:DescribeVpcs" ], "Resource": "*", "Condition": { "StringEquals": { "aws:RequestedRegion": "${aws:PrincipalTag/RTBFabricRegion}" } } }, { "Effect": "Allow", "Action": [ "cloudwatch:GetMetricStatistics", "cloudwatch:ListMetrics" ], "Resource": "*", "Condition": { "StringEquals": { "cloudwatch:namespace": "rtbfabric" } } } ] } ``` This policy grants full RTB Fabric permissions and allows viewing of related AWS resources like network interfaces and CloudWatch metrics that RTB Fabric manages. The EC2 describe actions are scoped to regions specified in the principal's RTBFabricRegion tag for additional security. ## RTB Fabric read-only permissions This example shows a policy that allows read-only access to RTB Fabric resources and related AWS resources. ``` { "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "rtbfabric:GetRequesterGateway", "rtbfabric:GetResponderGateway", "rtbfabric:ListRequesterGateways", "rtbfabric:ListResponderGateways", "rtbfabric:GetLink", "rtbfabric:ListLinks" ], "Resource": "*" }, { "Effect": "Allow", "Action": [ "ec2:DescribeNetworkInterfaces", "ec2:DescribeSubnets", "ec2:DescribeSecurityGroups", "ec2:DescribeVpcs" ], "Resource": "*" }, { "Effect": "Allow", "Action": [ "cloudwatch:GetMetricStatistics", "cloudwatch:ListMetrics" ], "Resource": "*", "Condition": { "StringEquals": { "cloudwatch:namespace": "rtbfabric" } } } ] } ``` This policy grants read-only access to RTB Fabric resources and allows viewing CloudWatch metrics published by the service. # AWS managed policies for AWS RTB Fabric AWS RTB Fabric uses AWS managed policies and service-linked roles to securely access AWS services on your behalf. AWS managed policies are standalone policies created and maintained by AWS that provide permissions for common use cases. A service-linked role is a unique type of IAM role that is linked directly to RTB Fabric and uses these managed policies to include all the permissions that the service requires to call other AWS services on your behalf. For information about the service-linked role that RTB Fabric creates, see [Using service-linked roles for RTB Fabric](https://docs.aws.amazon.com/using-service-linked-roles.html). ## RTBFabricServiceRolePolicy The RTBFabricServiceRolePolicy managed policy allows RTB Fabric to manage network interfaces and publish CloudWatch metrics on your behalf. This policy provides the necessary permissions for RTB Fabric to create, modify, and delete network interfaces with proper tagging controls, as well as to publish custom metrics to CloudWatch. This policy grants the following permissions: + *Amazon EC2 network interface management* – Allows creating network interfaces in specified subnets and security groups, with conditional permissions to create tagged network interfaces and manage network interface permissions. + *Amazon EC2 network interface operations* – Allows deleting and detaching network interfaces that are tagged with RTBFabricManaged=true, ensuring operations are limited to RTB Fabric-managed resources. + *Amazon EC2 tagging* – Allows creating tags on network interfaces during the CreateNetworkInterface action to properly identify RTB Fabric-managed resources. + *Amazon EC2 describe operations* – Allows describing availability zones, network interfaces, subnets, VPCs, and security groups to gather necessary information for network interface management. + *Amazon CloudWatch metrics* – Allows publishing custom metrics to the AWS/RTBFabric namespace for monitoring and observability purposes. To view more details about the policy, including the latest version of the JSON policy document, see [RTBFabricServiceRolePolicy](https://docs.aws.amazon.com/aws-managed-policy/latest/reference/RTBFabricServiceRolePolicy.html) in the *AWS Managed Policy Reference Guide*. ## RTB Fabric updates to AWS managed policies View details about updates to AWS managed policies for RTB Fabric since this service began tracking these changes. For automatic alerts about changes to this page, subscribe to the RSS feed on the RTB Fabric Document history page. | Change | Description | Date | | --- | --- | --- | | [RTBFabricServiceRolePolicy](https://docs.aws.amazon.com/aws-managed-policy/latest/reference/RTBFabricServiceRolePolicy.html) – Policy updated | RTB Fabric updated the CloudWatch namespace from `rtbfabric` to `AWS/RTBFabric` for publishing custom metrics. | October 16, 2025 | | [RTBFabricServiceRolePolicy](https://docs.aws.amazon.com/aws-managed-policy/latest/reference/RTBFabricServiceRolePolicy.html) – New policy | RTB Fabric added a new managed policy that allows RTB Fabric to manage network interfaces and publish CloudWatch metrics on your behalf. | August 19, 2025 | | RTB Fabric started tracking changes | RTB Fabric started tracking changes for its AWS managed policies. | March 1, 2021 | # Troubleshooting RTB Fabric identity and access Use the following information to help you diagnose and fix common issues that you might encounter when working with RTB Fabric and IAM. **Topics** + [I am not authorized to perform an action in RTB Fabric](#security_iam_troubleshoot-no-permissions) + [I am not authorized to perform iam:PassRole](#security_iam_troubleshoot-passrole) + [I want to allow people outside of my AWS account to access my RTB Fabric resources](#security_iam_troubleshoot-cross-account-access) ## I am not authorized to perform an action in RTB Fabric If you receive an error that you're not authorized to perform an action, your policies must be updated to allow you to perform the action. The following example error occurs when the `mateojackson` IAM user tries to use the console to view details about a fictional `my-example-widget` resource but doesn't have the fictional `rtbfabric:GetWidget` permissions. ``` User: arn:aws:iam::123456789012:user/mateojackson is not authorized to perform: rtbfabric:GetWidget on resource: my-example-widget ``` In this case, the policy for the `mateojackson` user must be updated to allow access to the `my-example-widget` resource by using the `rtbfabric:GetWidget` action. If you need help, contact your AWS administrator. Your administrator is the person who provided you with your sign-in credentials. ## I am not authorized to perform iam:PassRole If you receive an error that you're not authorized to perform the `iam:PassRole` action, your policies must be updated to allow you to pass a role to RTB Fabric. Some AWS services allow you to pass an existing role to that service instead of creating a new service role or service-linked role. To do this, you must have permissions to pass the role to the service. The following example error occurs when an IAM user named `marymajor` tries to use the console to perform an action in RTB Fabric. However, the action requires the service to have permissions that are granted by a service role. Mary does not have permissions to pass the role to the service. ``` User: arn:aws:iam::123456789012:user/marymajor is not authorized to perform: iam:PassRole ``` In this case, Mary's policies must be updated to allow her to perform the `iam:PassRole` action. If you need help, contact your AWS administrator. Your administrator is the person who provided you with your sign-in credentials. ## I want to allow people outside of my AWS account to access my RTB Fabric resources You can create a role that users in other accounts or people outside of your organization can use to access your resources. You can specify who is trusted to assume the role. For services that support resource-based policies or access control lists (ACLs), you can use those policies to grant people access to your resources. To learn more, consult the following: + To learn whether RTB Fabric supports these features, see [How RTB Fabric works with IAM](security_iam_service-with-iam.md). + To learn how to provide access to your resources across AWS accounts that you own, see [Providing access to an IAM user in another AWS account that you own](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_common-scenarios_aws-accounts.html) in the *IAM User Guide*. + To learn how to provide access to your resources to third-party AWS accounts, see [Providing access to AWS accounts owned by third parties](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_common-scenarios_third-party.html) in the *IAM User Guide*. + To learn how to provide access through identity federation, see [Providing access to externally authenticated users (identity federation)](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_common-scenarios_federated-users.html) in the *IAM User Guide*. + To learn the difference between using roles and resource-based policies for cross-account access, 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*. # Using service-linked roles for RTB Fabric AWS RTB Fabric uses AWS Identity and Access Management (IAM) [service-linked roles](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_terms-and-concepts.html#iam-term-service-linked-role). A service-linked role is a unique type of IAM role that is linked directly to RTB Fabric. Service-linked roles are predefined by RTB Fabric and include all the permissions that the service requires to call other AWS services on your behalf. A service-linked role makes setting up RTB Fabric easier because you don't have to manually add the necessary permissions. RTB Fabric defines the permissions of its service-linked roles, and unless defined otherwise, only RTB Fabric can assume its roles. The defined permissions include the trust policy and the permissions policy, and that permissions policy cannot be attached to any other IAM entity. You can delete a service-linked role only after first deleting their related resources. This protects your RTB Fabric resources because you can't inadvertently remove permission to access the resources. For information about other services that support 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) and look for the services that have **Yes** in the **Service-linked roles** column. Choose a **Yes** with a link to view the service-linked role documentation for that service. ## Service-linked role permissions for RTB Fabric RTB Fabric uses the service-linked role named `AWSServiceRoleForRTBFabric` – A service-linked role required for AWS RTB Fabric to access your network interface resources and deliver metrics. `AWSServiceRoleForRTBFabric` uses managed policy [RTBFabricServiceRolePolicy](security-iam-awsmanpol.md#aws-managed-policy-RTBFabricServiceRolePolicy). The AWSServiceRoleForRTBFabric service-linked role trusts the following services to assume the role: + `rtbfabric.amazonaws.com` The role permissions policy allows RTB Fabric to complete the following actions on the specified resources: + Action: `ec2:CreateNetworkInterface` on subnets and security groups + Action: `ec2:CreateNetworkInterface` on network interfaces with the `RTBFabricManaged:true` tag + Action: `ec2:CreateNetworkInterfacePermission` on network interfaces tagged with `RTBFabricManaged:true` + Action: `ec2:DeleteNetworkInterface` and `ec2:DetachNetworkInterface` on network interfaces tagged with `RTBFabricManaged:true` + Action: `ec2:CreateTags` on network interfaces during creation + Action: `ec2:Describe*` on EC2 resources for network interface management + Action: `cloudwatch:PutMetricData` to the `AWS/RTBFabric` namespace The complete permissions policy for this role is available in the [AWS Managed Policy Reference](https://docs.aws.amazon.com/aws-managed-policy/latest/reference/RTBFabricServiceRolePolicy.html). For information about policy updates, see [AWS managed policy updates](https://docs.aws.amazon.com/rtb-fabric/latest/userguide/security-iam-awsmanpol.html#security-iam-awsmanpol-updates). You must configure permissions to allow your users, groups, or roles to create, edit, or delete a service-linked role. For more information, see [Service-linked role permissions](https://docs.aws.amazon.com/IAM/latest/UserGuide/using-service-linked-roles.html#service-linked-role-permissions) in the *IAM User Guide*. ## Creating a service-linked role for RTB Fabric You don't need to manually create a service-linked role. When you create an RTB application for the first time (CreateRequesterRtbApp or CreateResponderRtbApp) in the AWS Management Console, the AWS CLI, or the AWS API, RTB Fabric creates the service-linked role for you. If you delete this service-linked role, and then need to create it again, you can use the same process to recreate the role in your account. When you create an RTB application for the first time (CreateRequesterRtbApp or CreateResponderRtbApp), RTB Fabric creates the service-linked role for you again. You can also use the IAM console to create a service-linked role with the **RTB Fabric** use case. In the AWS CLI or the AWS API, create a service-linked role with the `rtbfabric.amazonaws.com` service name. For more information, see [Creating a service-linked role](https://docs.aws.amazon.com/IAM/latest/UserGuide/using-service-linked-roles.html#create-service-linked-role) in the *IAM User Guide*. If you delete this service-linked role, you can use this same process to create the role again. ## Editing a service-linked role for RTB Fabric RTB Fabric does not allow you to edit the AWSServiceRoleForRTBFabric service-linked role. After you create a service-linked role, you cannot change the name of the role because various entities might reference the role. However, you can edit the description of the role using IAM. For more information, see [Editing a service-linked role](https://docs.aws.amazon.com/IAM/latest/UserGuide/using-service-linked-roles.html#edit-service-linked-role) in the *IAM User Guide*. ## Deleting a service-linked role for RTB Fabric If you no longer need to use a feature or service that requires a service-linked role, we recommend that you delete that role. That way you don't have an unused entity that is not actively monitored or maintained. However, you must clean up the resources for your service-linked role before you can manually delete it. **Note** If the RTB Fabric service is using the role when you try to delete the resources, then the deletion might fail. If that happens, wait for a few minutes and try the operation again. **To delete RTB Fabric resources used by the AWSServiceRoleForRTBFabric** 1. Delete all RTB applications in your account. You must delete both requester and responder gateways before you can delete the service-linked role. You can use either the console or the CLI: 1. **Console method:** For instructions on deleting requester gateways, see [Deleting a requester gateway](https://docs.aws.amazon.com/requester-rtb-applications.html#delete-requester-rtb-application). For instructions on deleting responder gateways, see [Deleting a responder gateway](https://docs.aws.amazon.com/responder-rtb-applications.html#delete-responder-rtb-application). 1. **CLI method:** Use the `DeleteRequesterGateway` or `DeleteResponderGateway` API to delete RTB gateways. Replace the example gateway ID with your gateway ID: ``` aws rtbfabric delete-requester-gateway --gateway-id rtb-gw-abc123xyz789 ``` The response returns a status of `PENDING_DELETION`: ``` { "gatewayId": "rtb-gw-abc123xyz789", "status": "PENDING_DELETION" } ``` Repeat this command for each RTB application in your account. 1. After deleting all RTB applications, wait for RTB Fabric to automatically clean up the network interfaces tagged with `RTBFabricManaged:true`. This process can take up to 20 minutes. 1. Verify that no RTB applications or RTB Fabric-managed network interfaces remain in your account: 1. Open the RTB Fabric console and verify that no RTB applications are listed. 1. Open the [Network Interfaces page](https://console.aws.amazon.com/ec2/home#NetworkInterfaces) of the Amazon EC2 console. 1. In the search box, enter `tag:RTBFabricManaged:true` to filter for RTB Fabric-managed network interfaces. 1. Verify that no network interfaces appear in the results. **Note** RTBFabric only deletes the network interface if no other RTBFabric configuration is using that network interface. If you have multiple RTBFabric configurations using the same subnet and security group combination, the network interface will remain until all configurations are removed. **Note** RTBFabric relies on the service-linked role permissions to delete network interfaces. Do not delete the AWSServiceRoleForRTBFabric role before RTBFabric completes the network interface cleanup, or the cleanup may fail. **To manually delete the service-linked role using IAM** Use the IAM console, the AWS CLI, or the AWS API to delete the AWSServiceRoleForRTBFabric service-linked role. For more information, see [Deleting a service-linked role](https://docs.aws.amazon.com/IAM/latest/UserGuide/using-service-linked-roles.html#delete-service-linked-role) in the *IAM User Guide*. ## Supported Regions for RTB Fabric service-linked roles RTB Fabric supports using service-linked roles in all of the Regions where the service is available. For more information, see [AWS Regions and endpoints](https://docs.aws.amazon.com/general/latest/gr/rande.html).