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Chapter 3. About IAM resources for ROSA clusters that use STS

To deploy a Red Hat OpenShift Service on AWS (ROSA) cluster that uses the AWS Security Token Service (STS), you must create the following AWS Identity Access Management (IAM) resources:

Specific account-wide IAM roles and policies that provide the STS permissions required for ROSA support, installation, control plane, and compute functionality. This includes account-wide Operator policies.
Cluster-specific Operator IAM roles that permit the ROSA cluster Operators to carry out core OpenShift functionality.
An OpenID Connect (OIDC) provider that the cluster Operators use to authenticate.
If you deploy ROSA by using OpenShift Cluster Manager, you must create the additional resources:
- An OpenShift Cluster Manager IAM role to complete the installation on your cluster.
- A user role without any permissions to verify your AWS account identity.

This document provides reference information about the IAM resources that you must deploy when you create a ROSA cluster that uses STS. It also includes the aws CLI commands that are generated when you use manual mode with the rosa create command.

Additional resources

For steps to quickly create a ROSA cluster with STS, including the AWS IAM resources, see Creating a ROSA cluster with STS using the default options.
For steps to create a ROSA cluster with STS using customizations, including the AWS IAM resources, see Creating a ROSA cluster with STS using customizations.

3.1. OpenShift Cluster Manager roles and permissions

If you create ROSA clusters by using OpenShift Cluster Manager, you must have the following AWS IAM roles linked to your AWS account to create and manage the clusters. For more information about linking your IAM roles to your AWS account, see Associating your AWS account.

Tip

If you only use the ROSA CLI (rosa), then you do not need to create these IAM roles.

These AWS IAM roles are as follows:

The ROSA user role is an AWS role used by Red Hat to verify the customer’s AWS identity. This role has no additional permissions, and the role has a trust relationship with the Red Hat installer account.
An ocm-role resource grants the required permissions for installation of ROSA clusters in OpenShift Cluster Manager. You can apply basic or administrative permissions to the ocm-role resource. If you create an administrative ocm-role resource, OpenShift Cluster Manager can create the needed AWS Operator roles and OpenID Connect (OIDC) provider. This IAM role also creates a trust relationship with the Red Hat installer account as well.
Note
The ocm-role IAM resource refers to the combination of the IAM role and the necessary policies created with it.

You must create this user role as well as an administrative ocm-role resource, if you want to use the auto mode in OpenShift Cluster Manager to create your Operator role policies and OIDC provider.

3.1.1. Understanding the OpenShift Cluster Manager role

Creating ROSA clusters in OpenShift Cluster Manager require an ocm-role IAM role. The basic ocm-role IAM role permissions let you to perform cluster maintenance within OpenShift Cluster Manager. To automatically create the operator roles and OpenID Connect (OIDC) provider, you must add the --admin option to the rosa create command. This command creates an ocm-role resource with additional permissions needed for administrative tasks.

Note

This elevated IAM role allows OpenShift Cluster Manager to automatically create the cluster-specific Operator roles and OIDC provider during cluster creation. For more information about this automatic role and policy creation, see the "Methods of account-wide role creation" link in Additional resources.

3.1.1.1. Understanding the user role

In addition to an ocm-role IAM role, you must create a user role so that Red Hat OpenShift Service on AWS can verify your AWS identity. This role has no permissions, and it is only used to create a trust relationship between the installer account and your ocm-role resources.

The following tables show the associated basic and administrative permissions for the ocm-role resource.

Table 3.1. Associated permissions for the basic ocm-role resource
Resource	Description
`iam:GetOpenIDConnectProvider`	This permission allows the basic role to retrieve information about the specified OpenID Connect (OIDC) provider.
`iam:GetRole`	This permission allows the basic role to retrieve any information for a specified role. Some of the data returned include the role’s path, GUID, ARN, and the role’s trust policy that grants permission to assume the role.
`iam:ListRoles`	This permission allows the basic role to list the roles within a path prefix.
`iam:ListRoleTags`	This permission allows the basic role to list the tags on a specified role.
`ec2:DescribeRegions`	This permission allows the basic role to return information about all of the enabled regions on your account.
`ec2:DescribeRouteTables`	This permission allows the basic role to return information about all of your route tables.
`ec2:DescribeSubnets`	This permission allows the basic role to return information about all of your subnets.
`ec2:DescribeVpcs`	This permission allows the basic role to return information about all of your virtual private clouds (VPCs).
`sts:AssumeRole`	This permission allows the basic role to retrieve temporary security credentials to access AWS resources that are beyond its normal permissions.
`sts:AssumeRoleWithWebIdentity`	This permission allows the basic role to retrieve temporary security credentials for users authenticated their account with a web identity provider.

Table 3.2. Additional permissions for the admin ocm-role resource
Resource	Description
`iam:AttachRolePolicy`	This permission allows the admin role to attach a specified policy to the desired IAM role.
`iam:CreateOpenIDConnectProvider`	This permission creates a resource that describes an identity provider, which supports OpenID Connect (OIDC). When you create an OIDC provider with this permission, this provider establishes a trust relationship between the provider and AWS.
`iam:CreateRole`	This permission allows the admin role to create a role for your AWS account.
`iam:ListPolicies`	This permission allows the admin role to list any policies associated with your AWS account.
`iam:ListPolicyTags`	This permission allows the admin role to list any tags on a designated policy.
`iam:PutRolePermissionsBoundary`	This permission allows the admin role to change the permissions boundary for a user based on a specified policy.
`iam:TagRole`	This permission allows the admin role to add tags to an IAM role.

Additional resources

Methods of account-wide role creation

Creating an ocm-role IAM role

You create your ocm-role IAM roles by using the command-line interface (CLI).

Prerequisites

You have an AWS account.
You have Red Hat Organization Administrator privileges in the OpenShift Cluster Manager organization.
You have the permissions required to install AWS account-wide roles.
You have installed and configured the latest Red Hat OpenShift Service on AWS (ROSA) CLI, rosa, on your installation host.

Procedure

To create an ocm-role IAM role with basic privileges, run the following command:
```
$ rosa create ocm-role
```
To create an ocm-role IAM role with admin privileges, run the following command:
```
$ rosa create ocm-role --admin
```
This command allows you create the role by specifying specific attributes. The following example output shows the "auto mode" selected, which lets the ROSA CLI (rosa) create your Operator roles and policies. See "Methods of account-wide role creation" in the Additional resources for more information.

Example output

I: Creating ocm role
? Role prefix: ManagedOpenShift 1
? Enable admin capabilities for the OCM role (optional): No 2
? Permissions boundary ARN (optional): 3
? Role Path (optional): 4
? Role creation mode: auto 5
I: Creating role using 'arn:aws:iam::<ARN>:user/<UserName>'
? Create the 'ManagedOpenShift-OCM-Role-182' role? Yes 6
I: Created role 'ManagedOpenShift-OCM-Role-182' with ARN  'arn:aws:iam::<ARN>:role/ManagedOpenShift-OCM-Role-182'
I: Linking OCM role
? OCM Role ARN: arn:aws:iam::<ARN>:role/ManagedOpenShift-OCM-Role-182 7
? Link the 'arn:aws:iam::<ARN>:role/ManagedOpenShift-OCM-Role-182' role with organization '<AWS ARN>'? Yes 8
I: Successfully linked role-arn 'arn:aws:iam::<ARN>:role/ManagedOpenShift-OCM-Role-182' with organization account '<AWS ARN>'

1: A prefix value for all of the created AWS resources. In this example, ManagedOpenShift prepends all of the AWS resources.
2: Choose if you want this role to have the additional admin permissions.
Note
You do not see this prompt if you used the --admin option.
3: The Amazon Resource Name (ARN) of the policy to set permission boundaries.
4: Specify an IAM path for the user name.
5: Choose the method to create your AWS roles. Using auto, the ROSA CLI generates and links the roles and policies. In the auto mode, you receive some different prompts to create the AWS roles.
6: The auto method asks if you want to create a specific ocm-role using your prefix.
7: Confirm that you want to associate your IAM role with your OpenShift Cluster Manager.
8: Links the created role with your AWS organization.

AWS IAM roles link to your AWS account to create and manage the clusters. For more information about linking your IAM roles to your AWS account, see Associating your AWS account.

Additional resources

3.2. Account-wide IAM role and policy reference

This section provides details about the account-wide IAM roles and policies that are required for ROSA deployments that use STS, including the Operator policies. It also includes the JSON files that define the policies.

The account-wide roles and policies are specific to an Red Hat OpenShift Service on AWS minor release version, for example Red Hat OpenShift Service on AWS 4.17, and are compatible with earlier versions. You can minimize the required STS resources by reusing the account-wide roles and policies for multiple clusters of the same minor version, regardless of their patch version.

3.2.1. Methods of account-wide role creation

You can create account-wide roles by using the Red Hat OpenShift Service on AWS (ROSA) CLI, rosa, or the OpenShift Cluster Manager guided installation. You can create the roles manually or by using an automatic process that uses predefined names for these roles and policies.

Manual ocm-role resource creation

You can use the manual creation method if you have the necessary CLI access to create these roles on your system. You can run this option in your desired CLI tool or from OpenShift Cluster Manager. After you start the manual creation process, the CLI presents a series of commands for you to run that create the roles and link them to the needed policies.

Automatic ocm-role resource creation

If you created an ocm-role resource with administrative permissions, you can use the automatic creation method from OpenShift Cluster Manager. The ROSA CLI does not require that you have this admin ocm-role IAM resource to automatically create these roles and policies. Selecting this method creates the roles and policies that uses the default names.

If you use the ROSA guided installation on OpenShift Cluster Manager, you must have created an ocm-role resource with administrative permissions in the first step of the guided cluster installation. Without this role, you cannot use the automatic Operator role and policy creation option, but you can still create the cluster and its roles and policies with the manual process.

Note

The account number present in the sts_installer_trust_policy.json and sts_support_trust_policy.json samples represents the Red Hat account that is allowed to assume the required roles.

Table 3.3. ROSA installer role, policy, and policy files
Resource	Description
`ManagedOpenShift-Installer-Role`	An IAM role used by the ROSA installer.
`ManagedOpenShift-Installer-Role-Policy`	An IAM policy that provides the ROSA installer with the permissions required to complete cluster installation tasks.

Example 3.1. sts_installer_trust_policy.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": {
                "AWS": [
                    "arn:aws:iam::%{aws_account_id}:role/RH-Managed-OpenShift-Installer"
                ]
            },
            "Action": [
                "sts:AssumeRole"
            ]
        }
    ]
}

Example 3.2. sts_installer_permission_policy.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "autoscaling:DescribeAutoScalingGroups",
                "ec2:AllocateAddress",
                "ec2:AssociateAddress",
                "ec2:AssociateDhcpOptions",
                "ec2:AssociateRouteTable",
                "ec2:AttachInternetGateway",
                "ec2:AttachNetworkInterface",
                "ec2:AuthorizeSecurityGroupEgress",
                "ec2:AuthorizeSecurityGroupIngress",
                "ec2:CopyImage",
                "ec2:CreateDhcpOptions",
                "ec2:CreateInternetGateway",
                "ec2:CreateNatGateway",
                "ec2:CreateNetworkInterface",
                "ec2:CreateRoute",
                "ec2:CreateRouteTable",
                "ec2:CreateSecurityGroup",
                "ec2:CreateSubnet",
                "ec2:CreateTags",
                "ec2:CreateVolume",
                "ec2:CreateVpc",
                "ec2:CreateVpcEndpoint",
                "ec2:DeleteDhcpOptions",
                "ec2:DeleteInternetGateway",
                "ec2:DeleteNatGateway",
                "ec2:DeleteNetworkInterface",
                "ec2:DeleteRoute",
                "ec2:DeleteRouteTable",
                "ec2:DeleteSecurityGroup",
                "ec2:DeleteSnapshot",
                "ec2:DeleteSubnet",
                "ec2:DeleteTags",
                "ec2:DeleteVolume",
                "ec2:DeleteVpc",
                "ec2:DeleteVpcEndpoints",
                "ec2:DeregisterImage",
                "ec2:DescribeAccountAttributes",
                "ec2:DescribeAddresses",
                "ec2:DescribeAvailabilityZones",
                "ec2:DescribeDhcpOptions",
                "ec2:DescribeImages",
                "ec2:DescribeInstanceAttribute",
                "ec2:DescribeInstanceCreditSpecifications",
                "ec2:DescribeInstances",
                "ec2:DescribeInstanceStatus",
                "ec2:DescribeInstanceTypeOfferings",
                "ec2:DescribeInstanceTypes",
                "ec2:DescribeInternetGateways",
                "ec2:DescribeKeyPairs",
                "ec2:DescribeNatGateways",
                "ec2:DescribeNetworkAcls",
                "ec2:DescribeNetworkInterfaces",
                "ec2:DescribePrefixLists",
                "ec2:DescribeRegions",
                "ec2:DescribeReservedInstancesOfferings",
                "ec2:DescribeRouteTables",
                "ec2:DescribeSecurityGroups",
                "ec2:DescribeSecurityGroupRules",
                "ec2:DescribeSubnets",
                "ec2:DescribeTags",
                "ec2:DescribeVolumes",
                "ec2:DescribeVpcAttribute",
                "ec2:DescribeVpcClassicLink",
                "ec2:DescribeVpcClassicLinkDnsSupport",
                "ec2:DescribeVpcEndpoints",
                "ec2:DescribeVpcs",
                "ec2:DetachInternetGateway",
                "ec2:DisassociateRouteTable",
                "ec2:GetConsoleOutput",
                "ec2:GetEbsDefaultKmsKeyId",
                "ec2:ModifyInstanceAttribute",
                "ec2:ModifyNetworkInterfaceAttribute",
                "ec2:ModifySubnetAttribute",
                "ec2:ModifyVpcAttribute",
                "ec2:ReleaseAddress",
                "ec2:ReplaceRouteTableAssociation",
                "ec2:RevokeSecurityGroupEgress",
                "ec2:RevokeSecurityGroupIngress",
                "ec2:RunInstances",
                "ec2:StartInstances",
                "ec2:StopInstances",
                "ec2:TerminateInstances",
                "elasticloadbalancing:AddTags",
                "elasticloadbalancing:ApplySecurityGroupsToLoadBalancer",
                "elasticloadbalancing:AttachLoadBalancerToSubnets",
                "elasticloadbalancing:ConfigureHealthCheck",
                "elasticloadbalancing:CreateListener",
                "elasticloadbalancing:CreateLoadBalancer",
                "elasticloadbalancing:CreateLoadBalancerListeners",
                "elasticloadbalancing:CreateTargetGroup",
                "elasticloadbalancing:DeleteLoadBalancer",
                "elasticloadbalancing:DeleteTargetGroup",
                "elasticloadbalancing:DeregisterInstancesFromLoadBalancer",
                "elasticloadbalancing:DeregisterTargets",
                "elasticloadbalancing:DescribeAccountLimits",
                "elasticloadbalancing:DescribeInstanceHealth",
                "elasticloadbalancing:DescribeListeners",
                "elasticloadbalancing:DescribeLoadBalancerAttributes",
                "elasticloadbalancing:DescribeLoadBalancers",
                "elasticloadbalancing:DescribeTags",
                "elasticloadbalancing:DescribeTargetGroupAttributes",
                "elasticloadbalancing:DescribeTargetGroups",
                "elasticloadbalancing:DescribeTargetHealth",
                "elasticloadbalancing:ModifyLoadBalancerAttributes",
                "elasticloadbalancing:ModifyTargetGroup",
                "elasticloadbalancing:ModifyTargetGroupAttributes",
                "elasticloadbalancing:RegisterInstancesWithLoadBalancer",
                "elasticloadbalancing:RegisterTargets",
                "elasticloadbalancing:SetLoadBalancerPoliciesOfListener",
                "elasticloadbalancing:SetSecurityGroups",
                "iam:AddRoleToInstanceProfile",
                "iam:CreateInstanceProfile",
                "iam:DeleteInstanceProfile",
                "iam:GetInstanceProfile",
                "iam:TagInstanceProfile",
                "iam:GetRole",
                "iam:GetRolePolicy",
                "iam:GetUser",
                "iam:ListAttachedRolePolicies",
                "iam:ListInstanceProfiles",
                "iam:ListInstanceProfilesForRole",
                "iam:ListRolePolicies",
                "iam:ListRoles",
                "iam:ListUserPolicies",
                "iam:ListUsers",
                "iam:PassRole",
                "iam:RemoveRoleFromInstanceProfile",
                "iam:SimulatePrincipalPolicy",
                "iam:TagRole",
                "iam:UntagRole",
                "route53:ChangeResourceRecordSets",
                "route53:ChangeTagsForResource",
                "route53:CreateHostedZone",
                "route53:DeleteHostedZone",
                "route53:GetAccountLimit",
                "route53:GetChange",
                "route53:GetHostedZone",
                "route53:ListHostedZones",
                "route53:ListHostedZonesByName",
                "route53:ListResourceRecordSets",
                "route53:ListTagsForResource",
                "route53:UpdateHostedZoneComment",
                "s3:CreateBucket",
                "s3:DeleteBucket",
                "s3:DeleteObject",
                "s3:DeleteObjectVersion",
                "s3:GetAccelerateConfiguration",
                "s3:GetBucketAcl",
                "s3:GetBucketCORS",
                "s3:GetBucketLocation",
                "s3:GetBucketLogging",
                "s3:GetBucketObjectLockConfiguration",
                "s3:GetBucketPolicy",
                "s3:GetBucketRequestPayment",
                "s3:GetBucketTagging",
                "s3:GetBucketVersioning",
                "s3:GetBucketWebsite",
                "s3:GetEncryptionConfiguration",
                "s3:GetLifecycleConfiguration",
                "s3:GetObject",
                "s3:GetObjectAcl",
                "s3:GetObjectTagging",
                "s3:GetObjectVersion",
                "s3:GetReplicationConfiguration",
                "s3:ListBucket",
                "s3:ListBucketVersions",
                "s3:PutBucketAcl",
                "s3:PutBucketPolicy",
                "s3:PutBucketTagging",
                "s3:PutBucketVersioning",
                "s3:PutEncryptionConfiguration",
                "s3:PutObject",
                "s3:PutObjectAcl",
                "s3:PutObjectTagging",
                "servicequotas:GetServiceQuota",
                "servicequotas:ListAWSDefaultServiceQuotas",
                "sts:AssumeRole",
                "sts:AssumeRoleWithWebIdentity",
                "sts:GetCallerIdentity",
                "tag:GetResources",
                "tag:UntagResources",
                "ec2:CreateVpcEndpointServiceConfiguration",
                "ec2:DeleteVpcEndpointServiceConfigurations",
                "ec2:DescribeVpcEndpointServiceConfigurations",
                "ec2:DescribeVpcEndpointServicePermissions",
                "ec2:DescribeVpcEndpointServices",
                "ec2:ModifyVpcEndpointServicePermissions",
                "kms:DescribeKey",
                "cloudwatch:GetMetricData"
            ],
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": [
                "secretsmanager:GetSecretValue"
            ],
            "Resource": "*",
            "Condition": {
                "StringEquals": {
                    "aws:ResourceTag/red-hat-managed": "true"
                }
            }
        }
    ]
}

Table 3.4. ROSA control plane role, policy, and policy files
Resource	Description
`ManagedOpenShift-ControlPlane-Role`	An IAM role used by the ROSA control plane.
`ManagedOpenShift-ControlPlane-Role-Policy`	An IAM policy that provides the ROSA control plane with the permissions required to manage its components.

Example 3.3. sts_instance_controlplane_trust_policy.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": {
                "Service": [
                    "ec2.amazonaws.com"
                ]
            },
            "Action": [
                "sts:AssumeRole"
            ]
        }
    ]
}

Example 3.4. sts_instance_controlplane_permission_policy.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "ReadPermissions",
            "Effect": "Allow",
            "Action": [
                "ec2:DescribeAvailabilityZones",
                "ec2:DescribeInstances",
                "ec2:DescribeRouteTables",
                "ec2:DescribeSecurityGroups",
                "ec2:DescribeSubnets",
                "ec2:DescribeVpcs",
                "elasticloadbalancing:DescribeLoadBalancers",
                "elasticloadbalancing:DescribeLoadBalancerAttributes",
                "elasticloadbalancing:DescribeListeners",
                "elasticloadbalancing:DescribeTargetGroups",
                "elasticloadbalancing:DescribeTargetHealth",
                "elasticloadbalancing:DescribeLoadBalancerPolicies"
            ],
            "Resource": [
                "*"
            ]
        },
        {
          "Sid": "KMSDescribeKey",
          "Effect": "Allow",
          "Action": [
              "kms:DescribeKey"
          ],
          "Resource": [
              "*"
          ],
          "Condition": {
              "StringEquals": {
                  "aws:ResourceTag/red-hat": "true"
              }
          }
        },
        {
            "Effect": "Allow",
            "Action": [
                "ec2:AttachVolume",
                "ec2:AuthorizeSecurityGroupIngress",
                "ec2:CreateSecurityGroup",
                "ec2:CreateTags",
                "ec2:CreateVolume",
                "ec2:DeleteSecurityGroup",
                "ec2:DeleteVolume",
                "ec2:DetachVolume",
                "ec2:ModifyInstanceAttribute",
                "ec2:ModifyVolume",
                "ec2:RevokeSecurityGroupIngress",
                "elasticloadbalancing:AddTags",
                "elasticloadbalancing:AttachLoadBalancerToSubnets",
                "elasticloadbalancing:ApplySecurityGroupsToLoadBalancer",
                "elasticloadbalancing:CreateListener",
                "elasticloadbalancing:CreateLoadBalancer",
                "elasticloadbalancing:CreateLoadBalancerPolicy",
                "elasticloadbalancing:CreateLoadBalancerListeners",
                "elasticloadbalancing:CreateTargetGroup",
                "elasticloadbalancing:ConfigureHealthCheck",
                "elasticloadbalancing:DeleteListener",
                "elasticloadbalancing:DeleteLoadBalancer",
                "elasticloadbalancing:DeleteLoadBalancerListeners",
                "elasticloadbalancing:DeleteTargetGroup",
                "elasticloadbalancing:DeregisterInstancesFromLoadBalancer",
                "elasticloadbalancing:DeregisterTargets",
                "elasticloadbalancing:DetachLoadBalancerFromSubnets",
                "elasticloadbalancing:ModifyListener",
                "elasticloadbalancing:ModifyLoadBalancerAttributes",
                "elasticloadbalancing:ModifyTargetGroup",
                "elasticloadbalancing:ModifyTargetGroupAttributes",
                "elasticloadbalancing:RegisterInstancesWithLoadBalancer",
                "elasticloadbalancing:RegisterTargets",
                "elasticloadbalancing:SetLoadBalancerPoliciesForBackendServer",
                "elasticloadbalancing:SetLoadBalancerPoliciesOfListener"
            ],
            "Resource": "*"
        }
    ]
}

Table 3.5. ROSA compute node role, policy, and policy files
Resource	Description
`ManagedOpenShift-Worker-Role`	An IAM role used by the ROSA compute instances.
`ManagedOpenShift-Worker-Role-Policy`	An IAM policy that provides the ROSA compute instances with the permissions required to manage their components.

Example 3.5. sts_instance_worker_trust_policy.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": {
                "Service": [
                    "ec2.amazonaws.com"
                ]
            },
            "Action": [
                "sts:AssumeRole"
            ]
        }
    ]
}

Example 3.6. sts_instance_worker_permission_policy.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "ec2:DescribeInstances",
                "ec2:DescribeRegions"
            ],
            "Resource": "*"
        }
    ]
}

Table 3.6. ROSA support role, policy, and policy files
Resource	Description
`ManagedOpenShift-Support-Role`	An IAM role used by the Red Hat Site Reliability Engineering (SRE) support team.
`ManagedOpenShift-Support-Role-Policy`	An IAM policy that provides the Red Hat SRE support team with the permissions required to support ROSA clusters.

Example 3.7. sts_support_trust_policy.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": {
                "AWS": [
                    "arn:aws:iam::%{aws_account_id}:role/RH-Technical-Support-Access"
                ]
            },
            "Action": [
                "sts:AssumeRole"
            ]
        }
    ]
}

Example 3.8. sts_support_permission_policy.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "cloudtrail:DescribeTrails",
                "cloudtrail:LookupEvents",
                "cloudwatch:GetMetricData",
                "cloudwatch:GetMetricStatistics",
                "cloudwatch:ListMetrics",
                "ec2-instance-connect:SendSerialConsoleSSHPublicKey",
                "ec2:CopySnapshot",
                "ec2:CreateNetworkInsightsPath",
                "ec2:CreateSnapshot",
                "ec2:CreateSnapshots",
                "ec2:CreateTags",
                "ec2:DeleteNetworkInsightsAnalysis",
                "ec2:DeleteNetworkInsightsPath",
                "ec2:DeleteTags",
                "ec2:DescribeAccountAttributes",
                "ec2:DescribeAddresses",
                "ec2:DescribeAddressesAttribute",
                "ec2:DescribeAggregateIdFormat",
                "ec2:DescribeAvailabilityZones",
                "ec2:DescribeByoipCidrs",
                "ec2:DescribeCapacityReservations",
                "ec2:DescribeCarrierGateways",
                "ec2:DescribeClassicLinkInstances",
                "ec2:DescribeClientVpnAuthorizationRules",
                "ec2:DescribeClientVpnConnections",
                "ec2:DescribeClientVpnEndpoints",
                "ec2:DescribeClientVpnRoutes",
                "ec2:DescribeClientVpnTargetNetworks",
                "ec2:DescribeCoipPools",
                "ec2:DescribeCustomerGateways",
                "ec2:DescribeDhcpOptions",
                "ec2:DescribeEgressOnlyInternetGateways",
                "ec2:DescribeIamInstanceProfileAssociations",
                "ec2:DescribeIdentityIdFormat",
                "ec2:DescribeIdFormat",
                "ec2:DescribeImageAttribute",
                "ec2:DescribeImages",
                "ec2:DescribeInstanceAttribute",
                "ec2:DescribeInstances",
                "ec2:DescribeInstanceStatus",
                "ec2:DescribeInstanceTypeOfferings",
                "ec2:DescribeInstanceTypes",
                "ec2:DescribeInternetGateways",
                "ec2:DescribeIpv6Pools",
                "ec2:DescribeKeyPairs",
                "ec2:DescribeLaunchTemplates",
                "ec2:DescribeLocalGatewayRouteTables",
                "ec2:DescribeLocalGatewayRouteTableVirtualInterfaceGroupAssociations",
                "ec2:DescribeLocalGatewayRouteTableVpcAssociations",
                "ec2:DescribeLocalGateways",
                "ec2:DescribeLocalGatewayVirtualInterfaceGroups",
                "ec2:DescribeLocalGatewayVirtualInterfaces",
                "ec2:DescribeManagedPrefixLists",
                "ec2:DescribeNatGateways",
                "ec2:DescribeNetworkAcls",
                "ec2:DescribeNetworkInsightsAnalyses",
                "ec2:DescribeNetworkInsightsPaths",
                "ec2:DescribeNetworkInterfaces",
                "ec2:DescribePlacementGroups",
                "ec2:DescribePrefixLists",
                "ec2:DescribePrincipalIdFormat",
                "ec2:DescribePublicIpv4Pools",
                "ec2:DescribeRegions",
                "ec2:DescribeReservedInstances",
                "ec2:DescribeRouteTables",
                "ec2:DescribeScheduledInstances",
                "ec2:DescribeSecurityGroupReferences",
                "ec2:DescribeSecurityGroupRules",
                "ec2:DescribeSecurityGroups",
                "ec2:DescribeSnapshotAttribute",
                "ec2:DescribeSnapshots",
                "ec2:DescribeSpotFleetInstances",
                "ec2:DescribeStaleSecurityGroups",
                "ec2:DescribeSubnets",
                "ec2:DescribeTags",
                "ec2:DescribeTransitGatewayAttachments",
                "ec2:DescribeTransitGatewayConnectPeers",
                "ec2:DescribeTransitGatewayConnects",
                "ec2:DescribeTransitGatewayMulticastDomains",
                "ec2:DescribeTransitGatewayPeeringAttachments",
                "ec2:DescribeTransitGatewayRouteTables",
                "ec2:DescribeTransitGateways",
                "ec2:DescribeTransitGatewayVpcAttachments",
                "ec2:DescribeVolumeAttribute",
                "ec2:DescribeVolumes",
                "ec2:DescribeVolumesModifications",
                "ec2:DescribeVolumeStatus",
                "ec2:DescribeVpcAttribute",
                "ec2:DescribeVpcClassicLink",
                "ec2:DescribeVpcClassicLinkDnsSupport",
                "ec2:DescribeVpcEndpointConnectionNotifications",
                "ec2:DescribeVpcEndpointConnections",
                "ec2:DescribeVpcEndpoints",
                "ec2:DescribeVpcEndpointServiceConfigurations",
                "ec2:DescribeVpcEndpointServicePermissions",
                "ec2:DescribeVpcEndpointServices",
                "ec2:DescribeVpcPeeringConnections",
                "ec2:DescribeVpcs",
                "ec2:DescribeVpnConnections",
                "ec2:DescribeVpnGateways",
                "ec2:GetAssociatedIpv6PoolCidrs",
                "ec2:GetConsoleOutput",
                "ec2:GetManagedPrefixListEntries",
                "ec2:GetSerialConsoleAccessStatus",
                "ec2:GetTransitGatewayAttachmentPropagations",
                "ec2:GetTransitGatewayMulticastDomainAssociations",
                "ec2:GetTransitGatewayPrefixListReferences",
                "ec2:GetTransitGatewayRouteTableAssociations",
                "ec2:GetTransitGatewayRouteTablePropagations",
                "ec2:ModifyInstanceAttribute",
                "ec2:RebootInstances",
                "ec2:RunInstances",
                "ec2:SearchLocalGatewayRoutes",
                "ec2:SearchTransitGatewayMulticastGroups",
                "ec2:SearchTransitGatewayRoutes",
                "ec2:StartInstances",
                "ec2:StartNetworkInsightsAnalysis",
                "ec2:StopInstances",
                "ec2:TerminateInstances",
                "elasticloadbalancing:ConfigureHealthCheck",
                "elasticloadbalancing:DescribeAccountLimits",
                "elasticloadbalancing:DescribeInstanceHealth",
                "elasticloadbalancing:DescribeListenerCertificates",
                "elasticloadbalancing:DescribeListeners",
                "elasticloadbalancing:DescribeLoadBalancerAttributes",
                "elasticloadbalancing:DescribeLoadBalancerPolicies",
                "elasticloadbalancing:DescribeLoadBalancerPolicyTypes",
                "elasticloadbalancing:DescribeLoadBalancers",
                "elasticloadbalancing:DescribeRules",
                "elasticloadbalancing:DescribeSSLPolicies",
                "elasticloadbalancing:DescribeTags",
                "elasticloadbalancing:DescribeTargetGroupAttributes",
                "elasticloadbalancing:DescribeTargetGroups",
                "elasticloadbalancing:DescribeTargetHealth",
                "iam:GetRole",
                "iam:ListRoles",
                "kms:CreateGrant",
                "route53:GetHostedZone",
                "route53:GetHostedZoneCount",
                "route53:ListHostedZones",
                "route53:ListHostedZonesByName",
                "route53:ListResourceRecordSets",
                "s3:GetBucketTagging",
                "s3:GetObjectAcl",
                "s3:GetObjectTagging",
                "s3:ListAllMyBuckets",
                "sts:DecodeAuthorizationMessage",
                "tiros:CreateQuery",
                "tiros:GetQueryAnswer",
                "tiros:GetQueryExplanation"
            ],
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": [
                "s3:ListBucket"
            ],
            "Resource": [
                "arn:aws:s3:::managed-velero*",
                "arn:aws:s3:::*image-registry*"
            ]
        }
    ]
}

Table 3.7. ROSA OCM role and policy file
Resource	Description
`ManagedOpenShift-OCM-Role`	You use this IAM role to create and maintain ROSA clusters in OpenShift Cluster Manager.

Example 3.9. sts_ocm_role_trust_policy.json

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "AWS": [
          "arn:aws:iam::%{aws_account_id}:role/RH-Managed-OpenShift-Installer"
        ]
      },
      "Action": [
        "sts:AssumeRole"
      ],
      "Condition": {"StringEquals": {"sts:ExternalId": "%{ocm_organization_id}"}}
    }
  ]
}

Table 3.8. ROSA user role and policy file
Resource	Description
`ManagedOpenShift-User-<OCM_user>-Role`	An IAM role used by Red Hat to verify the customer’s AWS identity.

Example 3.10. sts_user_role_trust_policy.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": {
                "AWS": [
                    "arn:aws:iam::%{aws_account_id}:role/RH-Managed-OpenShift-Installer"
                ]
            },
            "Action": [
                "sts:AssumeRole"
            ]
        }
    ]
}

Example CLI output for policies attached to a role

When a policy is attached to a role, the ROSA CLI displays a confirmation output. The output depends on the type of policy.

If the policy is a trust policy, the ROSA CLI outputs the role name and the content of the policy.

For the target role with policy attached, ROSA CLI outputs the role name and the console URL of the target role.
Target role with policy attached example output
```
I: Attached trust policy to role 'testrole-Worker-Role(https://console.aws.amazon.com/iam/home?#/roles/testrole-Worker-Role)': ******************
```

If the attached policy is a trust policy, the ROSA CLI outputs the content of this policy.

Trust policy example output

I: Attached trust policy to role 'test-Support-Role': {"Version": "2012-10-17", "Statement": [{"Action": ["sts:AssumeRole"], "Effect": "Allow", "Principal": {"AWS": ["arn:aws:iam::000000000000:role/RH-Technical-Support-00000000"]}}]}

If the policy is a permission policy, the ROSA CLI outputs the name and public link of this policy or the ARN depending on whether or not the policy is an AWS managed policy or customer-managed policy.
- If the attached policy is an AWS managed policy, the ROSA CLI outputs the name and public link of this policy and the role it is attached to.
  AWS managed policy example output
```
I: Attached policy 'ROSASRESupportPolicy(https://docs.aws.amazon.com/aws-managed-policy/latest/reference/ROSASRESupportPolicy)' to role 'test-HCP-ROSA-Support-Role(https://console.aws.amazon.com/iam/home?#/roles/test-HCP-ROSA-Support-Role)'
```
- If the attached policy is an AWS managed policy, the ROSA CLI outputs the name and public link of this policy and the role it is attached to.
  Customer-managed policy example output
```
I: Attached policy 'arn:aws:iam::000000000000:policy/testrole-Worker-Role-Policy' to role 'testrole-Worker-Role(https://console.aws.amazon.com/iam/home?#/roles/testrole-Worker-Role)'
```

Table 3.9. ROSA Ingress Operator IAM policy and policy file
Resource	Description
`ManagedOpenShift-openshift-ingress-operator-cloud-credentials`	An IAM policy that provides the ROSA Ingress Operator with the permissions required to manage external access to a cluster.

Example 3.11. openshift_ingress_operator_cloud_credentials_policy.json

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "elasticloadbalancing:DescribeLoadBalancers",
        "route53:ListHostedZones",
        "route53:ListTagsForResources",
        "route53:ChangeResourceRecordSets",
        "tag:GetResources"
      ],
      "Resource": "*"
    }
  ]
}

Table 3.10. ROSA back-end storage IAM policy and policy file
Resource	Description
`ManagedOpenShift-openshift-cluster-csi-drivers-ebs-cloud-credentials`	An IAM policy required by ROSA to manage back-end storage through the Container Storage Interface (CSI).

Example 3.12. openshift_cluster_csi_drivers_ebs_cloud_credentials_policy.json

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "ec2:AttachVolume",
        "ec2:CreateSnapshot",
        "ec2:CreateTags",
        "ec2:CreateVolume",
        "ec2:DeleteSnapshot",
        "ec2:DeleteTags",
        "ec2:DeleteVolume",
        "ec2:DescribeAvailabilityZones",
        "ec2:DescribeInstances",
        "ec2:DescribeSnapshots",
        "ec2:DescribeTags",
        "ec2:DescribeVolumes",
        "ec2:DescribeVolumesModifications",
        "ec2:DetachVolume",
        "ec2:EnableFastSnapshotRestores",
        "ec2:ModifyVolume"
      ],
      "Resource": "*"
    }
  ]
}

Table 3.11. ROSA Machine Config Operator policy and policy file
Resource	Description
`ManagedOpenShift-openshift-machine-api-aws-cloud-credentials`	An IAM policy that provides the ROSA Machine Config Operator with the permissions required to perform core cluster functionality.

Example 3.13. openshift_machine_api_aws_cloud_credentials_policy.json

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "ec2:CreateTags",
        "ec2:DescribeAvailabilityZones",
        "ec2:DescribeDhcpOptions",
        "ec2:DescribeImages",
        "ec2:DescribeInstances",
        "ec2:DescribeInternetGateways",
        "ec2:DescribeInstanceTypes",
        "ec2:DescribeSecurityGroups",
        "ec2:DescribeRegions",
        "ec2:DescribeSubnets",
        "ec2:DescribeVpcs",
        "ec2:RunInstances",
        "ec2:TerminateInstances",
        "elasticloadbalancing:DescribeLoadBalancers",
        "elasticloadbalancing:DescribeTargetGroups",
        "elasticloadbalancing:DescribeTargetHealth",
        "elasticloadbalancing:RegisterInstancesWithLoadBalancer",
        "elasticloadbalancing:RegisterTargets",
        "elasticloadbalancing:DeregisterTargets",
        "iam:PassRole",
        "iam:CreateServiceLinkedRole"
      ],
      "Resource": "*"
    },
    {
      "Effect": "Allow",
      "Action": [
        "kms:Decrypt",
        "kms:Encrypt",
        "kms:GenerateDataKey",
        "kms:GenerateDataKeyWithoutPlainText",
        "kms:DescribeKey"
      ],
      "Resource": "*"
    },
    {
      "Effect": "Allow",
      "Action": [
        "kms:RevokeGrant",
        "kms:CreateGrant",
        "kms:ListGrants"
      ],
      "Resource": "*",
      "Condition": {
        "Bool": {
          "kms:GrantIsForAWSResource": true
        }
      }
    }
  ]
}

Table 3.12. ROSA Cloud Credential Operator policy and policy file
Resource	Description
`ManagedOpenShift-openshift-cloud-credential-operator-cloud-credentials`	An IAM policy that provides the ROSA Cloud Credential Operator with the permissions required to manage cloud provider credentials.

Example 3.14. openshift_cloud_credential_operator_cloud_credential_operator_iam_ro_creds_policy.json

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "iam:GetUser",
        "iam:GetUserPolicy",
        "iam:ListAccessKeys"
      ],
      "Resource": "*"
    }
  ]
}

Table 3.13. ROSA Image Registry Operator policy and policy file
Resource	Description
`ManagedOpenShift-openshift-image-registry-installer-cloud-credentials`	An IAM policy that provides the ROSA Image Registry Operator with the permissions required to manage the OpenShift image registry storage in AWS S3 for a cluster.

Example 3.15. openshift_image_registry_installer_cloud_credentials_policy.json

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "s3:CreateBucket",
        "s3:DeleteBucket",
        "s3:PutBucketTagging",
        "s3:GetBucketTagging",
        "s3:PutBucketPublicAccessBlock",
        "s3:GetBucketPublicAccessBlock",
        "s3:PutEncryptionConfiguration",
        "s3:GetEncryptionConfiguration",
        "s3:PutLifecycleConfiguration",
        "s3:GetLifecycleConfiguration",
        "s3:GetBucketLocation",
        "s3:ListBucket",
        "s3:GetObject",
        "s3:PutObject",
        "s3:DeleteObject",
        "s3:ListBucketMultipartUploads",
        "s3:AbortMultipartUpload",
        "s3:ListMultipartUploadParts"
      ],
      "Resource": "*"
    }
  ]
}

Additional resources

For a definition of OpenShift major, minor, and patch versions, see the Red Hat OpenShift Service on AWS update life cycle.

3.2.2. Account-wide IAM role and policy AWS CLI reference

This section lists the aws CLI commands that the rosa command generates in the terminal. You can run the command in either manual or automatic mode.

Using manual mode for account role creation

The manual role creation mode generates the aws commands for you to review and run. The following command starts that process, where <openshift_version> refers to your version of Red Hat OpenShift Service on AWS (ROSA), such as 4.17.

$ rosa create account-roles --mode manual

Note

The provided command examples include the ManagedOpenShift prefix. The ManagedOpenShift prefix is the default value, if you do not specify a custom prefix by using the --prefix option.

Command output

aws iam create-role \
	--role-name ManagedOpenShift-Installer-Role \
	--assume-role-policy-document file://sts_installer_trust_policy.json \
	--tags Key=rosa_openshift_version,Value=<openshift_version> Key=rosa_role_prefix,Value=ManagedOpenShift Key=rosa_role_type,Value=installer

aws iam put-role-policy \
	--role-name ManagedOpenShift-Installer-Role \
	--policy-name ManagedOpenShift-Installer-Role-Policy \
	--policy-document file://sts_installer_permission_policy.json

aws iam create-role \
	--role-name ManagedOpenShift-ControlPlane-Role \
	--assume-role-policy-document file://sts_instance_controlplane_trust_policy.json \
	--tags Key=rosa_openshift_version,Value=<openshift_version> Key=rosa_role_prefix,Value=ManagedOpenShift Key=rosa_role_type,Value=instance_controlplane

aws iam put-role-policy \
	--role-name ManagedOpenShift-ControlPlane-Role \
	--policy-name ManagedOpenShift-ControlPlane-Role-Policy \
	--policy-document file://sts_instance_controlplane_permission_policy.json

aws iam create-role \
	--role-name ManagedOpenShift-Worker-Role \
	--assume-role-policy-document file://sts_instance_worker_trust_policy.json \
	--tags Key=rosa_openshift_version,Value=<openshift_version> Key=rosa_role_prefix,Value=ManagedOpenShift Key=rosa_role_type,Value=instance_worker

aws iam put-role-policy \
	--role-name ManagedOpenShift-Worker-Role \
	--policy-name ManagedOpenShift-Worker-Role-Policy \
	--policy-document file://sts_instance_worker_permission_policy.json

aws iam create-role \
	--role-name ManagedOpenShift-Support-Role \
	--assume-role-policy-document file://sts_support_trust_policy.json \
	--tags Key=rosa_openshift_version,Value=<openshift_version> Key=rosa_role_prefix,Value=ManagedOpenShift Key=rosa_role_type,Value=support

aws iam put-role-policy \
	--role-name ManagedOpenShift-Support-Role \
	--policy-name ManagedOpenShift-Support-Role-Policy \
	--policy-document file://sts_support_permission_policy.json

aws iam create-policy \
	--policy-name ManagedOpenShift-openshift-ingress-operator-cloud-credentials \
	--policy-document file://openshift_ingress_operator_cloud_credentials_policy.json \
	--tags Key=rosa_openshift_version,Value=<openshift_version> Key=rosa_role_prefix,Value=ManagedOpenShift Key=operator_namespace,Value=openshift-ingress-operator Key=operator_name,Value=cloud-credentials

aws iam create-policy \
	--policy-name ManagedOpenShift-openshift-cluster-csi-drivers-ebs-cloud-credent \
	--policy-document file://openshift_cluster_csi_drivers_ebs_cloud_credentials_policy.json \
	--tags Key=rosa_openshift_version,Value=<openshift_version> Key=rosa_role_prefix,Value=ManagedOpenShift Key=operator_namespace,Value=openshift-cluster-csi-drivers Key=operator_name,Value=ebs-cloud-credentials

aws iam create-policy \
	--policy-name ManagedOpenShift-openshift-machine-api-aws-cloud-credentials \
	--policy-document file://openshift_machine_api_aws_cloud_credentials_policy.json \
	--tags Key=rosa_openshift_version,Value=<openshift_version> Key=rosa_role_prefix,Value=ManagedOpenShift Key=operator_namespace,Value=openshift-machine-api Key=operator_name,Value=aws-cloud-credentials

aws iam create-policy \
	--policy-name ManagedOpenShift-openshift-cloud-credential-operator-cloud-crede \
	--policy-document file://openshift_cloud_credential_operator_cloud_credential_operator_iam_ro_creds_policy.json \
	--tags Key=rosa_openshift_version,Value=<openshift_version> Key=rosa_role_prefix,Value=ManagedOpenShift Key=operator_namespace,Value=openshift-cloud-credential-operator Key=operator_name,Value=cloud-credential-operator-iam-ro-creds

aws iam create-policy \
	--policy-name ManagedOpenShift-openshift-image-registry-installer-cloud-creden \
	--policy-document file://openshift_image_registry_installer_cloud_credentials_policy.json \
	--tags Key=rosa_openshift_version,Value=<openshift_version> Key=rosa_role_prefix,Value=ManagedOpenShift Key=operator_namespace,Value=openshift-image-registry Key=operator_name,Value=installer-cloud-credentials

Using auto mode for role creation

When you add the --mode auto argument, the Red Hat OpenShift Service on AWS (ROSA) CLI, rosa, creates your roles and policies. The following command starts that process:

$ rosa create account-roles --mode auto

Note

The provided command examples include the ManagedOpenShift prefix. The ManagedOpenShift prefix is the default value, if you do not specify a custom prefix by using the --prefix option.

Command output

I: Creating roles using 'arn:aws:iam::<ARN>:user/<UserID>'
? Create the 'ManagedOpenShift-Installer-Role' role? Yes
I: Created role 'ManagedOpenShift-Installer-Role' with ARN 'arn:aws:iam::<ARN>:role/ManagedOpenShift-Installer-Role'
? Create the 'ManagedOpenShift-ControlPlane-Role' role? Yes
I: Created role 'ManagedOpenShift-ControlPlane-Role' with ARN 'arn:aws:iam::<ARN>:role/ManagedOpenShift-ControlPlane-Role'
? Create the 'ManagedOpenShift-Worker-Role' role? Yes
I: Created role 'ManagedOpenShift-Worker-Role' with ARN 'arn:aws:iam::<ARN>:role/ManagedOpenShift-Worker-Role'
? Create the 'ManagedOpenShift-Support-Role' role? Yes
I: Created role 'ManagedOpenShift-Support-Role' with ARN 'arn:aws:iam::<ARN>:role/ManagedOpenShift-Support-Role'
? Create the operator policies? Yes
I: Created policy with ARN 'arn:aws:iam::<ARN>:policy/ManagedOpenShift-openshift-machine-api-aws-cloud-credentials'
I: Created policy with ARN 'arn:aws:iam::<ARN>:policy/ManagedOpenShift-openshift-cloud-credential-operator-cloud-crede'
I: Created policy with ARN 'arn:aws:iam::<ARN>:policy/ManagedOpenShift-openshift-image-registry-installer-cloud-creden'
I: Created policy with ARN 'arn:aws:iam::<ARN>:policy/ManagedOpenShift-openshift-ingress-operator-cloud-credentials'
I: Created policy with ARN 'arn:aws:iam::<ARN>:policy/ManagedOpenShift-openshift-cluster-csi-drivers-ebs-cloud-credent'
I: Created policy with ARN 'arn:aws:iam::<ARN>:policy/ManagedOpenShift-openshift-cloud-network-config-controller-cloud'
I: To create a cluster with these roles, run the following command:
rosa create cluster --sts

3.3. Permission boundaries for the installer role

You can apply a policy as a permissions boundary on an installer role. You can use an AWS-managed policy or a customer-managed policy to set the boundary for an Amazon Web Services(AWS) Identity and Access Management (IAM) entity (user or role). The combination of policy and boundary policy limits the maximum permissions for the user or role. ROSA includes a set of three prepared permission boundary policy files, with which you can restrict permissions for the installer role since changing the installer policy itself is not supported.

Note

This feature is only supported on Red Hat OpenShift Service on AWS (classic architecture) clusters.

The permission boundary policy files are as follows:

The Core boundary policy file contains the minimum permissions needed for ROSA (classic architecture) installer to install an Red Hat OpenShift Service on AWS cluster. The installer does not have permissions to create a virtual private cloud (VPC) or PrivateLink (PL). A VPC needs to be provided.
The VPC boundary policy file contains the minimum permissions needed for ROSA (classic architecture) installer to create/manage the VPC. It does not include permissions for PL or core installation. If you need to install a cluster with enough permissions for the installer to install the cluster and create/manage the VPC, but you do not need to set up PL, then use the core and VPC boundary files together with the installer role.
The PrivateLink (PL) boundary policy file contains the minimum permissions needed for ROSA (classic architecture) installer to create the AWS PL with a cluster. It does not include permissions for VPC or core installation. Provide a pre-created VPC for all PL clusters during installation.

When using the permission boundary policy files, the following combinations apply:

No permission boundary policies means that the full installer policy permissions apply to your cluster.
Core only sets the most restricted permissions for the installer role. The VPC and PL permissions are not included in the Core only boundary policy.
- Installer cannot create or manage the VPC or PL.
- You must have a customer-provided VPC, and PrivateLink (PL) is not available.
Core + VPC sets the core and VPC permissions for the installer role.
- Installer cannot create or manage the PL.
- Assumes you are not using custom/BYO-VPC.
- Assumes the installer will create and manage the VPC.
Core + PrivateLink (PL) means the installer can provision the PL infrastructure.
- You must have a customer-provided VPC.
- This is for a private cluster with PL.

This example procedure is applicable for an installer role and policy with the most restriction of permissions, using only the core installer permission boundary policy for ROSA. You can complete this with the AWS console or the AWS CLI. This example uses the AWS CLI and the following policy:

Example 3.16. sts_installer_core_permission_boundary_policy.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
		    "autoscaling:DescribeAutoScalingGroups",
		    "ec2:AllocateAddress",
		    "ec2:AssociateAddress",
		    "ec2:AttachNetworkInterface",
		    "ec2:AuthorizeSecurityGroupEgress",
		    "ec2:AuthorizeSecurityGroupIngress",
		    "ec2:CopyImage",
		    "ec2:CreateNetworkInterface",
		    "ec2:CreateSecurityGroup",
		    "ec2:CreateTags",
		    "ec2:CreateVolume",
		    "ec2:DeleteNetworkInterface",
		    "ec2:DeleteSecurityGroup",
		    "ec2:DeleteSnapshot",
		    "ec2:DeleteTags",
		    "ec2:DeleteVolume",
		    "ec2:DeregisterImage",
		    "ec2:DescribeAccountAttributes",
		    "ec2:DescribeAddresses",
		    "ec2:DescribeAvailabilityZones",
		    "ec2:DescribeDhcpOptions",
		    "ec2:DescribeImages",
		    "ec2:DescribeInstanceAttribute",
		    "ec2:DescribeInstanceCreditSpecifications",
		    "ec2:DescribeInstances",
		    "ec2:DescribeInstanceStatus",
		    "ec2:DescribeInstanceTypeOfferings",
		    "ec2:DescribeInstanceTypes",
		    "ec2:DescribeInternetGateways",
		    "ec2:DescribeKeyPairs",
		    "ec2:DescribeNatGateways",
		    "ec2:DescribeNetworkAcls",
		    "ec2:DescribeNetworkInterfaces",
		    "ec2:DescribePrefixLists",
		    "ec2:DescribeRegions",
		    "ec2:DescribeReservedInstancesOfferings",
		    "ec2:DescribeRouteTables",
		    "ec2:DescribeSecurityGroups",
		    "ec2:DescribeSecurityGroupRules",
		    "ec2:DescribeSubnets",
		    "ec2:DescribeTags",
		    "ec2:DescribeVolumes",
		    "ec2:DescribeVpcAttribute",
		    "ec2:DescribeVpcClassicLink",
		    "ec2:DescribeVpcClassicLinkDnsSupport",
		    "ec2:DescribeVpcEndpoints",
		    "ec2:DescribeVpcs",
		    "ec2:GetConsoleOutput",
		    "ec2:GetEbsDefaultKmsKeyId",
		    "ec2:ModifyInstanceAttribute",
		    "ec2:ModifyNetworkInterfaceAttribute",
		    "ec2:ReleaseAddress",
		    "ec2:RevokeSecurityGroupEgress",
		    "ec2:RevokeSecurityGroupIngress",
		    "ec2:RunInstances",
		    "ec2:StartInstances",
		    "ec2:StopInstances",
		    "ec2:TerminateInstances",
		    "elasticloadbalancing:AddTags",
		    "elasticloadbalancing:ApplySecurityGroupsToLoadBalancer",
		    "elasticloadbalancing:AttachLoadBalancerToSubnets",
		    "elasticloadbalancing:ConfigureHealthCheck",
		    "elasticloadbalancing:CreateListener",
		    "elasticloadbalancing:CreateLoadBalancer",
		    "elasticloadbalancing:CreateLoadBalancerListeners",
		    "elasticloadbalancing:CreateTargetGroup",
		    "elasticloadbalancing:DeleteLoadBalancer",
		    "elasticloadbalancing:DeleteTargetGroup",
		    "elasticloadbalancing:DeregisterInstancesFromLoadBalancer",
		    "elasticloadbalancing:DeregisterTargets",
		    "elasticloadbalancing:DescribeInstanceHealth",
		    "elasticloadbalancing:DescribeListeners",
		    "elasticloadbalancing:DescribeLoadBalancerAttributes",
		    "elasticloadbalancing:DescribeLoadBalancers",
		    "elasticloadbalancing:DescribeTags",
		    "elasticloadbalancing:DescribeTargetGroupAttributes",
		    "elasticloadbalancing:DescribeTargetGroups",
		    "elasticloadbalancing:DescribeTargetHealth",
		    "elasticloadbalancing:ModifyLoadBalancerAttributes",
		    "elasticloadbalancing:ModifyTargetGroup",
		    "elasticloadbalancing:ModifyTargetGroupAttributes",
		    "elasticloadbalancing:RegisterInstancesWithLoadBalancer",
		    "elasticloadbalancing:RegisterTargets",
		    "elasticloadbalancing:SetLoadBalancerPoliciesOfListener",
		    "elasticloadbalancing:SetSecurityGroups",
		    "iam:AddRoleToInstanceProfile",
		    "iam:CreateInstanceProfile",
		    "iam:DeleteInstanceProfile",
		    "iam:GetInstanceProfile",
		    "iam:TagInstanceProfile",
		    "iam:GetRole",
		    "iam:GetRolePolicy",
		    "iam:GetUser",
		    "iam:ListAttachedRolePolicies",
		    "iam:ListInstanceProfiles",
		    "iam:ListInstanceProfilesForRole",
		    "iam:ListRolePolicies",
		    "iam:ListRoles",
		    "iam:ListUserPolicies",
		    "iam:ListUsers",
		    "iam:PassRole",
		    "iam:RemoveRoleFromInstanceProfile",
		    "iam:SimulatePrincipalPolicy",
		    "iam:TagRole",
		    "iam:UntagRole",
		    "route53:ChangeResourceRecordSets",
		    "route53:ChangeTagsForResource",
		    "route53:CreateHostedZone",
		    "route53:DeleteHostedZone",
		    "route53:GetAccountLimit",
		    "route53:GetChange",
		    "route53:GetHostedZone",
		    "route53:ListHostedZones",
		    "route53:ListHostedZonesByName",
		    "route53:ListResourceRecordSets",
		    "route53:ListTagsForResource",
		    "route53:UpdateHostedZoneComment",
		    "s3:CreateBucket",
		    "s3:DeleteBucket",
		    "s3:DeleteObject",
		    "s3:GetAccelerateConfiguration",
		    "s3:GetBucketAcl",
		    "s3:GetBucketCORS",
		    "s3:GetBucketLocation",
		    "s3:GetBucketLogging",
		    "s3:GetBucketObjectLockConfiguration",
		    "s3:GetBucketPolicy",
		    "s3:GetBucketRequestPayment",
		    "s3:GetBucketTagging",
		    "s3:GetBucketVersioning",
		    "s3:GetBucketWebsite",
		    "s3:GetEncryptionConfiguration",
		    "s3:GetLifecycleConfiguration",
		    "s3:GetObject",
		    "s3:GetObjectAcl",
		    "s3:GetObjectTagging",
		    "s3:GetObjectVersion",
		    "s3:GetReplicationConfiguration",
		    "s3:ListBucket",
		    "s3:ListBucketVersions",
		    "s3:PutBucketAcl",
		    "s3:PutBucketPolicy",
		    "s3:PutBucketTagging",
		    "s3:PutEncryptionConfiguration",
		    "s3:PutObject",
		    "s3:PutObjectAcl",
		    "s3:PutObjectTagging",
		    "servicequotas:GetServiceQuota",
		    "servicequotas:ListAWSDefaultServiceQuotas",
		    "sts:AssumeRole",
		    "sts:AssumeRoleWithWebIdentity",
		    "sts:GetCallerIdentity",
		    "tag:GetResources",
		    "tag:UntagResources",
		    "kms:DescribeKey",
		    "cloudwatch:GetMetricData",
		    "ec2:CreateRoute",
		    "ec2:DeleteRoute",
		    "ec2:CreateVpcEndpoint",
		    "ec2:DeleteVpcEndpoints",
		    "ec2:CreateVpcEndpointServiceConfiguration",
		    "ec2:DeleteVpcEndpointServiceConfigurations",
		    "ec2:DescribeVpcEndpointServiceConfigurations",
		    "ec2:DescribeVpcEndpointServicePermissions",
		    "ec2:DescribeVpcEndpointServices",
		    "ec2:ModifyVpcEndpointServicePermissions"
            ],
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": [
                "secretsmanager:GetSecretValue"
            ],
            "Resource": "*",
            "Condition": {
                "StringEquals": {
                    "aws:ResourceTag/red-hat-managed": "true"
                }
            }
        }
    ]
}

Important

To use the permission boundaries, you will need to prepare the permission boundary policy and add it to your relevant installer role in AWS IAM. While the ROSA (rosa) CLI offers a permission boundary function, it applies to all roles and not just the installer role, which means it does not work with the provided permission boundary policies (which are only for the installer role).

Prerequisites

You have an AWS account.
You have the permissions required to administer AWS roles and policies.
You have installed and configured the latest AWS (aws) and ROSA (rosa) CLIs on your workstation.
You have already prepared your ROSA account-wide roles, includes the installer role, and the corresponding policies. If these do not exist in your AWS account, see "Creating the account-wide STS roles and policies" in Additional resources.

Procedure

Prepare the policy file by entering the following command in the rosa CLI:

$ curl -o ./rosa-installer-core.json https://raw.githubusercontent.com/openshift/managed-cluster-config/master/resources/sts/4.17/sts_installer_core_permission_boundary_policy.json

Create the policy in AWS and gather its Amazon Resource Name (ARN) by entering the following command:

$ aws iam create-policy \
--policy-name rosa-core-permissions-boundary-policy \
--policy-document file://./rosa-installer-core.json \
--description "ROSA installer core permission boundary policy, the minimum permission set, allows BYO-VPC, disallows PrivateLink"

Example output

{
    "Policy": {
        "PolicyName": "rosa-core-permissions-boundary-policy",
        "PolicyId": "<Policy ID>",
        "Arn": "arn:aws:iam::<account ID>:policy/rosa-core-permissions-boundary-policy",
        "Path": "/",
        "DefaultVersionId": "v1",
        "AttachmentCount": 0,
        "PermissionsBoundaryUsageCount": 0,
        "IsAttachable": true,
        "CreateDate": "<CreateDate>",
        "UpdateDate": "<UpdateDate>"
    }
}

Add the permission boundary policy to the installer role you want to restrict by entering the following command:

$ aws iam put-role-permissions-boundary \
--role-name ManagedOpenShift-Installer-Role \
--permissions-boundary arn:aws:iam::<account ID>:policy/rosa-core-permissions-boundary-policy

Display the installer role to validate attached policies (including permissions boundary) by entering the following command in the rosa CLI:

$ aws iam get-role --role-name ManagedOpenShift-Installer-Role \
--output text | grep PERMISSIONSBOUNDARY

Example output

PERMISSIONSBOUNDARY	arn:aws:iam::<account ID>:policy/rosa-core-permissions-boundary-policy	Policy

For more examples of PL and VPC permission boundary policies see:

Example 3.17. sts_installer_privatelink_permission_boundary_policy.json

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "ec2:ModifyVpcEndpointServiceConfiguration",
        "route53:ListHostedZonesByVPC",
        "route53:CreateVPCAssociationAuthorization",
        "route53:AssociateVPCWithHostedZone",
        "route53:DeleteVPCAssociationAuthorization",
        "route53:DisassociateVPCFromHostedZone",
        "route53:ChangeResourceRecordSets"
      ],
      "Resource": "*"
    }
  ]
}

Example 3.18. sts_installer_vpc_permission_boundary_policy.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
		    "ec2:AssociateDhcpOptions",
		    "ec2:AssociateRouteTable",
		    "ec2:AttachInternetGateway",
		    "ec2:CreateDhcpOptions",
		    "ec2:CreateInternetGateway",
		    "ec2:CreateNatGateway",
		    "ec2:CreateRouteTable",
		    "ec2:CreateSubnet",
		    "ec2:CreateVpc",
		    "ec2:DeleteDhcpOptions",
		    "ec2:DeleteInternetGateway",
		    "ec2:DeleteNatGateway",
		    "ec2:DeleteRouteTable",
		    "ec2:DeleteSubnet",
		    "ec2:DeleteVpc",
		    "ec2:DetachInternetGateway",
		    "ec2:DisassociateRouteTable",
		    "ec2:ModifySubnetAttribute",
		    "ec2:ModifyVpcAttribute",
		    "ec2:ReplaceRouteTableAssociation"
            ],
            "Resource": "*"
        }
    ]
}

Additional resources

For more information, see Permissions boundaries for IAM entities (AWS documentation).
For more information about creating the required account-wide STS roles and policies see Creating the account-wide STS roles and policies.

3.4. Cluster-specific Operator IAM role reference

This section provides details about the Operator IAM roles that are required for Red Hat OpenShift Service on AWS (ROSA) deployments that use STS. The cluster Operators use the Operator roles to obtain the temporary permissions required to carry out cluster operations, such as managing back-end storage, cloud provider credentials, and external access to a cluster.

When you create the Operator roles, the account-wide Operator policies for the matching cluster version are attached to the roles. The Operator policies are tagged with the Operator and version they are compatible with. The correct policy for an Operator role is determined by using the tags.

Note

If more than one matching policy is available in your account for an Operator role, an interactive list of options is provided when you create the Operator.

Table 3.14. ROSA cluster-specific Operator roles
Resource	Description
`<cluster_name>-<hash>-openshift-cluster-csi-drivers-ebs-cloud-credentials`	An IAM role required by ROSA to manage back-end storage through the Container Storage Interface (CSI).
`<cluster_name>-<hash>-openshift-machine-api-aws-cloud-credentials`	An IAM role required by the ROSA Machine Config Operator to perform core cluster functionality.
`<cluster_name>-<hash>-openshift-cloud-credential-operator-cloud-credentials`	An IAM role required by the ROSA Cloud Credential Operator to manage cloud provider credentials.
`<cluster_name>-<hash>-openshift-cloud-network-config-controller-credentials`	An IAM role required by the cloud network config controller to manage cloud network configuration for a cluster.
`<cluster_name>-<hash>-openshift-image-registry-installer-cloud-credentials`	An IAM role required by the ROSA Image Registry Operator to manage the OpenShift image registry storage in AWS S3 for a cluster.
`<cluster_name>-<hash>-openshift-ingress-operator-cloud-credentials`	An IAM role required by the ROSA Ingress Operator to manage external access to a cluster.
`<cluster_name>-<hash>-openshift-cloud-network-config-controller-cloud-credentials`	An IAM role required by the cloud network config controller to manage cloud network credentials for a cluster.

3.4.1. Operator IAM role AWS CLI reference

This section lists the aws CLI commands that are shown in the terminal when you run the following rosa command using manual mode:

$ rosa create operator-roles --mode manual --cluster <cluster_name>

Note

When using manual mode, the aws commands are printed to the terminal for your review. After reviewing the aws commands, you must run them manually. Alternatively, you can specify --mode auto with the rosa create command to run the aws commands immediately.

Command output

aws iam create-role \
	--role-name <cluster_name>-<hash>-openshift-cluster-csi-drivers-ebs-cloud-credent \
	--assume-role-policy-document file://operator_cluster_csi_drivers_ebs_cloud_credentials_policy.json \
	--tags Key=rosa_cluster_id,Value=<id> Key=rosa_openshift_version,Value=<openshift_version> Key=rosa_role_prefix,Value= Key=operator_namespace,Value=openshift-cluster-csi-drivers Key=operator_name,Value=ebs-cloud-credentials

aws iam attach-role-policy \
	--role-name <cluster_name>-<hash>-openshift-cluster-csi-drivers-ebs-cloud-credent \
	--policy-arn arn:aws:iam::<aws_account_id>:policy/ManagedOpenShift-openshift-cluster-csi-drivers-ebs-cloud-credent

aws iam create-role \
	--role-name <cluster_name>-<hash>-openshift-machine-api-aws-cloud-credentials \
	--assume-role-policy-document file://operator_machine_api_aws_cloud_credentials_policy.json \
	--tags Key=rosa_cluster_id,Value=<id> Key=rosa_openshift_version,Value=<openshift_version> Key=rosa_role_prefix,Value= Key=operator_namespace,Value=openshift-machine-api Key=operator_name,Value=aws-cloud-credentials

aws iam attach-role-policy \
	--role-name <cluster_name>-<hash>-openshift-machine-api-aws-cloud-credentials \
	--policy-arn arn:aws:iam::<aws_account_id>:policy/ManagedOpenShift-openshift-machine-api-aws-cloud-credentials

aws iam create-role \
	--role-name <cluster_name>-<hash>-openshift-cloud-credential-operator-cloud-crede \
	--assume-role-policy-document file://operator_cloud_credential_operator_cloud_credential_operator_iam_ro_creds_policy.json \
	--tags Key=rosa_cluster_id,Value=<id> Key=rosa_openshift_version,Value=<openshift_version> Key=rosa_role_prefix,Value= Key=operator_namespace,Value=openshift-cloud-credential-operator Key=operator_name,Value=cloud-credential-operator-iam-ro-creds

aws iam attach-role-policy \
	--role-name <cluster_name>-<hash>-openshift-cloud-credential-operator-cloud-crede \
	--policy-arn arn:aws:iam::<aws_account_id>:policy/ManagedOpenShift-openshift-cloud-credential-operator-cloud-crede

aws iam create-role \
	--role-name <cluster_name>-<hash>-openshift-image-registry-installer-cloud-creden \
	--assume-role-policy-document file://operator_image_registry_installer_cloud_credentials_policy.json \
	--tags Key=rosa_cluster_id,Value=<id> Key=rosa_openshift_version,Value=<openshift_version> Key=rosa_role_prefix,Value= Key=operator_namespace,Value=openshift-image-registry Key=operator_name,Value=installer-cloud-credentials

aws iam attach-role-policy \
	--role-name <cluster_name>-<hash>-openshift-image-registry-installer-cloud-creden \
	--policy-arn arn:aws:iam::<aws_account_id>:policy/ManagedOpenShift-openshift-image-registry-installer-cloud-creden

aws iam create-role \
	--role-name <cluster_name>-<hash>-openshift-ingress-operator-cloud-credentials \
	--assume-role-policy-document file://operator_ingress_operator_cloud_credentials_policy.json \
	--tags Key=rosa_cluster_id,Value=<id> Key=rosa_openshift_version,Value=<openshift_version> Key=rosa_role_prefix,Value= Key=operator_namespace,Value=openshift-ingress-operator Key=operator_name,Value=cloud-credentials

aws iam attach-role-policy \
	--role-name <cluster_name>-<hash>-openshift-ingress-operator-cloud-credentials \
	--policy-arn arn:aws:iam::<aws_account_id>:policy/ManagedOpenShift-openshift-ingress-operator-cloud-credentials

Note

The command examples provided in the table include Operator roles that use the ManagedOpenShift prefix. If you defined a custom prefix when you created the account-wide roles and policies, including the Operator policies, you must reference it by using the --prefix <prefix_name> option when you create the Operator roles.

3.4.2. About custom Operator IAM role prefixes

Each Red Hat OpenShift Service on AWS (ROSA) cluster that uses the AWS Security Token Service (STS) requires cluster-specific Operator IAM roles.

By default, the Operator role names are prefixed with the cluster name and a random 4-digit hash. For example, the Cloud Credential Operator IAM role for a cluster named mycluster has the default name mycluster-<hash>-openshift-cloud-credential-operator-cloud-credentials, where <hash> is a random 4-digit string.

This default naming convention enables you to easily identify the Operator IAM roles for a cluster in your AWS account.

When you create the Operator roles for a cluster, you can optionally specify a custom prefix to use instead of <cluster_name>-<hash>. By using a custom prefix, you can prepend logical identifiers to your Operator role names to meet the requirements of your environment. For example, you might prefix the cluster name and the environment type, such as mycluster-dev. In that example, the Cloud Credential Operator role name with the custom prefix is mycluster-dev-openshift-cloud-credential-operator-cloud-credenti.

Note

The role names are truncated to 64 characters.

Additional resources

For steps to create the cluster-specific Operator IAM roles using a custom prefix, see link:https://docs.redhat.com/en/documentation/red_hat_openshift_service_on_aws/4/html-single/install_rosa_classic_clusters/#rosa-sts-creating-cluster-customizations-cli_rosa-sts-creating-a-cluster-with-customizations[Creating a cluster with customizations using the CLI] or link:https://docs.redhat.com/en/documentation/red_hat_openshift_service_on_aws/4/html-single/install_rosa_classic_clusters/#rosa-sts-creating-cluster-customizations-ocm_rosa-sts-creating-a-cluster-with-customizations[Creating a cluster with customizations by using {cluster-manager}].

3.5. Open ID Connect (OIDC) requirements for Operator authentication

For ROSA installations that use STS, you must create a cluster-specific OIDC provider that is used by the cluster Operators to authenticate or create your own OIDC configuration for your own OIDC provider.

3.5.1. Creating an OIDC provider using the CLI

You can create an OIDC provider that is hosted in your AWS account with the Red Hat OpenShift Service on AWS (ROSA) CLI, rosa.

Prerequisites

You have installed the latest version of the ROSA CLI.

Procedure

To create an OIDC provider, by using an unregistered or a registered OIDC configuration.
- Unregistered OIDC configurations require you to create the OIDC provider through the cluster. Run the following to create the OIDC provider:
```
$ rosa create oidc-provider --mode manual --cluster <cluster_name>
```
  Note
  When using manual mode, the aws command is printed to the terminal for your review. After reviewing the aws command, you must run it manually. Alternatively, you can specify --mode auto with the rosa create command to run the aws command immediately.
  Command output
```
aws iam create-open-id-connect-provider \
	--url https://oidc.op1.openshiftapps.com/<oidc_config_id> \1
	--client-id-list openshift sts.<aws_region>.amazonaws.com \
	--thumbprint-list <thumbprint> 2
```
  1
  The URL used to reach the OpenID Connect (OIDC) identity provider after the cluster is created.
  2
  The thumbprint is generated automatically when you run the rosa create oidc-provider command. For more information about using thumbprints with AWS Identity and Access Management (IAM) OIDC identity providers, see the AWS documentation.
- Registered OIDC configurations use an OIDC configuration ID. Run the following command with your OIDC configuration ID:
```
$ rosa create oidc-provider --oidc-config-id <oidc_config_id> --mode auto -y
```
  Command output
```
I: Creating OIDC provider using 'arn:aws:iam::4540112244:user/userName'
I: Created OIDC provider with ARN 'arn:aws:iam::4540112244:oidc-provider/dvbwgdztaeq9o.cloudfront.net/241rh9ql5gpu99d7leokhvkp8icnalpf'
```

3.5.2. Creating an OpenID Connect Configuration

When using a cluster hosted by Red Hat, you can create a managed or unmanaged OpenID Connect (OIDC) configuration by using the Red Hat OpenShift Service on AWS (ROSA) CLI, rosa. A managed OIDC configuration is stored within Red Hat’s AWS account, while a generated unmanaged OIDC configuration is stored within your AWS account. The OIDC configuration is registered to be used with OpenShift Cluster Manager. When creating an unmanaged OIDC configuration, the CLI provides the private key for you.

Creating an OpenID Connect configuration

When using a Red Hat OpenShift Service on AWS cluster, you can create the OpenID Connect (OIDC) configuration prior to creating your cluster. This configuration is registered to be used with OpenShift Cluster Manager.

Prerequisites

You have installed and configured the latest Red Hat OpenShift Service on AWS (ROSA) CLI, rosa, on your installation host.

Procedure

To create your OIDC configuration alongside the AWS resources, run the following command:

$ rosa create oidc-config --mode=auto --yes

This command returns the following information.

Example output

? Would you like to create a Managed (Red Hat hosted) OIDC Configuration Yes
I: Setting up managed OIDC configuration
I: To create Operator Roles for this OIDC Configuration, run the following command and remember to replace <user-defined> with a prefix of your choice:
	rosa create operator-roles --prefix <user-defined> --oidc-config-id 13cdr6b
If you are going to create a Hosted Control Plane cluster please include '--hosted-cp'
I: Creating OIDC provider using 'arn:aws:iam::4540112244:user/userName'
? Create the OIDC provider? Yes
I: Created OIDC provider with ARN 'arn:aws:iam::4540112244:oidc-provider/dvbwgdztaeq9o.cloudfront.net/13cdr6b'

When creating your cluster, you must supply the OIDC config ID. The CLI output provides this value for --mode auto, otherwise you must determine these values based on aws CLI output for --mode manual.

Optional: you can save the OIDC configuration ID as a variable to use later. Run the following command to save the variable:
```
$ export OIDC_ID=<oidc_config_id>1
```
1
In the example output above, the OIDC configuration ID is 13cdr6b.
- View the value of the variable by running the following command:
```
$ echo $OIDC_ID
```
  Example output
```
13cdr6b
```

Verification

You can list the possible OIDC configurations available for your clusters that are associated with your user organization. Run the following command:

$ rosa list oidc-config

Example output

ID                                MANAGED  ISSUER URL                                                             SECRET ARN
2330dbs0n8m3chkkr25gkkcd8pnj3lk2  true     https://dvbwgdztaeq9o.cloudfront.net/2330dbs0n8m3chkkr25gkkcd8pnj3lk2
233hvnrjoqu14jltk6lhbhf2tj11f8un  false    https://oidc-r7u1.s3.us-east-1.amazonaws.com                           aws:secretsmanager:us-east-1:242819244:secret:rosa-private-key-oidc-r7u1-tM3MDN

Parameter options for creating your own OpenID Connect configuration

The following options may be added to the rosa create oidc-config command. All of these parameters are optional. Running the rosa create oidc-config command without parameters creates an unmanaged OIDC configuration.

Note

You are required to register the unmanaged OIDC configuration by posting a request to /oidc_configs through OpenShift Cluster Manager. You receive an ID in the response. Use this ID to create a cluster.

raw-files

Allows you to provide raw files for the private RSA key. This key is named rosa-private-key-oidc-<random_label_of_length_4>.key. You also receive a discovery document, named discovery-document-oidc-<random_label_of_length_4>.json, and a JSON Web Key Set, named jwks-oidc-<random_label_of_length_4>.json.

You use these files to set up the endpoint. This endpoint responds to /.well-known/openid-configuration with the discovery document and on keys.json with the JSON Web Key Set. The private key is stored in Amazon Web Services (AWS) Secrets Manager Service (SMS) as plaintext.

Example

$ rosa create oidc-config --raw-files

mode

Allows you to specify the mode to create your OIDC configuration. With the manual option, you receive AWS commands that set up the OIDC configuration in an S3 bucket. This option stores the private key in the Secrets Manager. With the manual option, the OIDC Endpoint URL is the URL for the S3 bucket. You must retrieve the Secrets Manager ARN to register the OIDC configuration with OpenShift Cluster Manager.

You receive the same OIDC configuration and AWS resources as the manual mode when using the auto option. A significant difference between the two options is that when using the auto option, ROSA calls AWS, so you do not need to take any further actions. The OIDC Endpoint URL is the URL for the S3 bucket. The CLI retrieves the Secrets Manager ARN, registers the OIDC configuration with OpenShift Cluster Manager, and reports the second rosa command that the user can run to continue with the creation of the STS cluster.

Example

$ rosa create oidc-config --mode=<auto|manual>

managed

Creates an OIDC configuration that is hosted under Red Hat’s AWS account. This command creates a private key that responds directly with an OIDC Config ID for you to use when creating the STS cluster.

Example

$ rosa create oidc-config --managed

Example output

W: For a managed OIDC Config only auto mode is supported. However, you may choose the provider creation mode
? OIDC Provider creation mode: auto
I: Setting up managed OIDC configuration
I: Please run the following command to create a cluster with this oidc config
rosa create cluster --sts --oidc-config-id 233jnu62i9aphpucsj9kueqlkr1vcgra
I: Creating OIDC provider using 'arn:aws:iam::242819244:user/userName'
? Create the OIDC provider? Yes
I: Created OIDC provider with ARN 'arn:aws:iam::242819244:oidc-provider/dvbwgdztaeq9o.cloudfront.net/233jnu62i9aphpucsj9kueqlkr1vcgra'

3.6. Minimum set of effective permissions for service control policies (SCP)

Service control policies (SCP) are a type of organization policy that manages permissions within your organization. SCPs ensure that accounts within your organization stay within your defined access control guidelines. These policies are maintained in AWS Organizations and control the services that are available within the attached AWS accounts. SCP management is the responsibility of the customer.

Note

When using AWS Security Token Service (STS), you must ensure that the service control policy does not block the following resources:

ec2:{}
iam:{}
tag:*

Verify that your service control policy (SCP) does not restrict any of these required permissions.

	Service	Actions	Effect
Required	Amazon EC2	All	Allow
	Amazon EC2 Auto Scaling	All	Allow
	Amazon S3	All	Allow
	Identity And Access Management	All	Allow
	Elastic Load Balancing	All	Allow
	Elastic Load Balancing V2	All	Allow
	Amazon CloudWatch	All	Allow
	Amazon CloudWatch Events	All	Allow
	Amazon CloudWatch Logs	All	Allow
	AWS EC2 Instance Connect	SendSerialConsoleSSHPublicKey	Allow
	AWS Support	All	Allow
	AWS Key Management Service	All	Allow
	AWS Security Token Service	All	Allow
	AWS Tiro	CreateQuery GetQueryAnswer GetQueryExplanation	Allow
	AWS Marketplace	Subscribe Unsubscribe View Subscriptions	Allow
	AWS Resource Tagging	All	Allow
	AWS Route53 DNS	All	Allow
	AWS Service Quotas	ListServices GetRequestedServiceQuotaChange GetServiceQuota RequestServiceQuotaIncrease ListServiceQuotas	Allow
Optional	AWS Billing	ViewAccount Viewbilling ViewUsage	Allow
	AWS Cost and Usage Report	All	Allow
	AWS Cost Explorer Services	All	Allow

Additional resources

3.7. Customer-managed policies

Red Hat OpenShift Service on AWS (ROSA) users are able to attach customer-managed policies to the IAM roles required to run and maintain ROSA clusters. This capability is not uncommon with AWS IAM roles. The ability to attach these policies to ROSA-specific IAM roles extends a ROSA cluster’s permission capabilities; for example, as a way to allow cluster components to access additional AWS resources that are otherwise not part of the ROSA-specific IAM policies.

To ensure that any critical customer applications that rely on customer-managed policies are not modified in any way during cluster or role upgrades, ROSA utilizes the ListAttachedRolesPolicies permission to retrieve the list of permission policies from roles and the ListRolePolicies permission to retrieve the list of policies from ROSA-specific roles. This information ensures that customer-managed policies are not impacted during cluster events, and allows Red Hat SREs to monitor both ROSA and customer-managed policies attached to ROSA-specific IAM roles, enhancing their ability to troubleshoot any cluster issues more effectively.

Warning

Attaching permission boundary policies to IAM roles that restrict ROSA-specific policies is not supported, as these policies could interrupt the functionality of the basic permissions necessary to successfully run and maintain your ROSA cluster. There are prepared permissions boundary policies for the ROSA (classic architecture) installer role. See the Additional resources section for more information.

Additional resources

Dieser Inhalt ist in der von Ihnen ausgewählten Sprache nicht verfügbar.

Chapter 3. About IAM resources for ROSA clusters that use STS

3.1. OpenShift Cluster Manager roles and permissions

3.1.1. Understanding the OpenShift Cluster Manager role

3.1.1.1. Understanding the user role

Creating an ocm-role IAM role

3.2. Account-wide IAM role and policy reference

3.2.1. Methods of account-wide role creation

Manual ocm-role resource creation

Automatic ocm-role resource creation

Example CLI output for policies attached to a role

3.2.2. Account-wide IAM role and policy AWS CLI reference

Using manual mode for account role creation

Using auto mode for role creation

3.3. Permission boundaries for the installer role

3.4. Cluster-specific Operator IAM role reference

3.4.1. Operator IAM role AWS CLI reference

3.4.2. About custom Operator IAM role prefixes

3.5. Open ID Connect (OIDC) requirements for Operator authentication

3.5.1. Creating an OIDC provider using the CLI

3.5.2. Creating an OpenID Connect Configuration

Creating an OpenID Connect configuration

Parameter options for creating your own OpenID Connect configuration

raw-files

mode

managed

3.6. Minimum set of effective permissions for service control policies (SCP)

3.7. Customer-managed policies

Lernen

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