Application load balancer single-sign-on for Amazon MWAA

Overview

This is the accompanying solution to the AWS blogpost "Automating secure access to multiple Amazon MWAA environments using existing OpenID Connect (OIDC) single-sign-on (SSO) authentication and authorization"

This solution enables OpenID Connect (OIDC) single-sign-on (SSO) authentication and authorization for accessing Apache Airflow UI across multiple existing Amazon Managed Workflows for Apache Airflow (MWAA) Environments.

Although not required, this solution can also be used to provision new Amazon MWAA Environments with either PUBLIC_ONLY and PRIVATE_ONLY access modes. The new environments provisioned through this solution would be created with the OpenID Connect (OIDC) single-sign-on (SSO) authentication and authorization integration built-in.

In the following sections, we first describe the applicable use cases, followed by the comprehensive solution architecture and instructions to implement for each of those use cases. Additionally, there is system and user perspectives for understanding the comprehensive solution, prerequisites, and step-by-step tutorial for deploying and using the detailed solution.

Solution architecture

The solution provisions AWS resources for two distinct patterns required for the specific usecases:

To provision resources required to provide integration to single existing Amazon MWAA environment as mentioned in the QuickStart section.
To provision resources required for all other usecases: Integrate to multiple existing Amazon MWAA environments or create one or more new Amazon MWAA environments

Architecture for Quickstart

The solution architecture diagram with numbered call flow sequence to integrate with an existing Amazon MWAA environment with Public Access mode is shown below:

User-agent resolves ALB DNS domain name from DNS resolver.
User-agent sends login request to the ALB path /aws_mwaa/aws-console-sso.
ALB redirects the user-agent to the OIDC identity provider (Idp) authentication endpoint, and the user-agent authenticates with the OIDC Idp.
If user authentication is successful, the OIDC Idp redirects the user-agent to the configured ALB redirect_url with authorization code included in the redirect URL.
ALB uses the authorization code to get access_token and OpenID JWT token with "openid email" scope from the OIDC Idp, and forwards the login request to the Amazon MWAA Authenticator Lambda target with the JWT token included in the request header x-amzn-oidc-data.
Amazon MWAA Authenticator Lambda verifies the JWT token in the request header using ALB public keys, and uses the configured fixed rbac_role to login to the requested mwaa_env environment. Quick start option does not perform any user authorization for the configured rbac_role.
Amazon MWAA Authenticator Lambda routes the user-agent to the Apache Airflow console in the requested Amazon MWAA Environment with login token through the ALB.

Architecture for Other use cases:

The solution architecture diagram with numbered call flow sequence for internet network reachability is shown below:

The solution architecture diagram for AWS Client VPN network reachability is shown below:

The central component of the solution architecture is an Application Load Balancer (ALB) setup with a fully-qualified domain name (FQDN) and public (internet), or private access. The ALB provides SSO access to one or more Amazon MWAA Environments.

The user-agent (web browser) call flow for accessing an Apache Airflow console in the target Amazon MWAA environment is as follows:

User-agent resolves ALB DNS domain name from DNS resolver.
User-agent sends login request to the ALB path /aws_mwaa/aws-console-sso with the target Amazon MWAA Environment and the Apache Airflow role based access control (RBAC) role in the query parameters mwaa_env and rbac_role, respectively.
ALB redirects the user-agent to the OIDC identity provider (Idp) authentication endpoint, and the user-agent authenticates with the OIDC Idp.
If user authentication is successful, the OIDC Idp redirects the user-agent to the configured ALB redirect_url with authorization code included in the redirect URL.
ALB uses the authorization code to get access_token and OpenID JWT token with "openid email" scope from the OIDC Idp, and forwards the login request to the Amazon MWAA Authenticator Lambda target with the JWT token included in the request header x-amzn-oidc-data.
Amazon MWAA Authenticator Lambda verifies the JWT token in the request header using ALB public keys, and authorizes the authenticated user for the requested mwaa_env and rbac_role using a DynamoDB table. The use of DynamoDB for authorization is optional, and the Lambda code function is_allowed can be adapted to use other authorization mechanisms.
Amazon MWAA Authenticator Lambda redirects the user-agent to the Apache Airflow console in the requested Amazon MWAA Environment with login token included in the redirect URL.

This solution architecture assumes that the user-agent has network reachability to the AWS Application Load Balancer and Apache Airflow console endpoints used in this solution. If the endpoints are public, then reachability is over the internet, otherwise, the network reachability is assumed via an AWS Direct Connect, or AWS Client VPN.

NOTE: This solution does not setup up AWS Client VPN.

Applicable Use cases

Use this solution for the following purposes:

Purpose	Description	Sectional Reference
Integrate to a single existing Amazon MWAA environment	If you are integrating with a single existing Amazon MWAA environment, follow the guides in the Quickstart section. The Quickstart requires that you specify the same ALB VPC as that of your existing Amazon MWAA VPC. You can specify the default Apache Airflow RBAC role that all users will assume. The ALB with an HTTPS listener is configured within your existing Amazon MWAA VPC.	Quick start
Integrate to multiple existing Amazon MWAA environments	For connecting to multiple existing Amazon MWAA environments that are already provisioned (either with Public or Private access modes) in your AWS accounts. The setup process will create a new VPC with subnets hosting the ALB and the HTTPS listener. You must define the CIDR range for this ALB VPC such that it does not overlap with the VPC CIDR range of your existing Amazon MWAA VPCs. You can specify the default Apache Airflow RBAC role that all users will assume.	Integrate to multiple existing Amazon MWAA environments
Create a single new Amazon MWAA environment with built-in integration	For creating a new Amazon MWAA environment, either with Public or Private access mode with in-built OIDC integration. The setup process will create an ALB VPC, an ALB with an HTTPS listener, an AWS Lambda Authorizer, an Amazon DynamoDB table, the respective Amazon MWAA VPCs and an Amazon MWAA environment in them. Further, it creates the VPC peering connection between the ALB VPC and the Amazon MWAA VPC.	Create a new Amazon MWAA environment
Create multiple new Amazon MWAA environments with built-in integration	For creating multiple new Amazon MWAA environments, either with Public or Private access mode with in-built OIDC integration for each of them. The setup process will create an ALB VPC, an ALB with an HTTPS listener, an AWS Lambda Authorizer, an Amazon DynamoDB table, the respective Amazon MWAA VPCs and multiple Amazon MWAA environments in them. Further, it creates the VPC peering connection between the ALB VPC and the Amazon MWAA VPC.	Create multiple new Amazon MWAA environments

Quick start

If you need to use an Application Load Balancer (ALB) to provide OIDC based SSO to a single exsiting Amazon MWAA environment with uniform Apache Airflow RBAC role access, you only need to complete the steps described below in the Quick start section. Under this option, all HTTPS traffic between your browser and the Amazon MWAA UI console flows through the ALB, and all ALB SSO authenticated users have uniform access to the single Amazon MWAA environment.

Setup

Complete the prerequisites, and run following command:

source setup-venv.sh

Complete Oidc and Alb contexts in cdk.context.json. The Oidc context specifies the configuration of your OIDC Idp. For example, for Okta OIDC Idp, the configuration would be similar to shown below:

"Oidc": {
    "ClientId": "...",
    "ClientSecretArn": "...",
    "Issuer": "https://xxx.okta.com/oauth2/default",
    "AuthorizationEndpoint":"https://xxx.okta.com/oauth2/default/v1/authorize",
    "TokenEndpoint":"https://xxx.okta.com/oauth2/default/v1/token",
    "UserInfoEndpoint":"https://xxx.okta.com/oauth2/default/v1/userinfo"
}

The ALB may be internet facing, or private. By default, the ALB is private. Set InternetFacing to true below for internet facing ALB:

"Alb": {
    "InternetFacing": false,
    "SessionCookieName": "AWSELBAuthSessionCookie",
    "LogBucketArn": "...",
    "LogBucketPrefix": "customer-alb",
    "CertificateArn": "..."
}

Complete QuickStart in cdk.context.json using information obtained from your existing MWAA environment. The VpcId below must be the same as the customer VPC Id for your existing MWAA environment. You must specify at least two SubnetIds from your VpcId residing in two different AWS availability zones. The SubnetIds must be for public subnets if you set InternetFacing to true in Alb above, or they must be for private subnets. The SecurityGroupId you specify below must allow HTTPs access for the user-agent (your browser), and you would need to ensure that the security group of your MWAA environment allows access from the Alb load-balancer. Note: The Alb will be created in the customer VPC of your existing MWAA environment. To specify the MwaaEndpointIps below, find the Amazon MWAA endpoint IPs using AWS console or CLI. Valid values for RbacRoleName below are Admin, User, Viewer, Op, and Public.

"QuickStart": {
    "VpcId": "...",
    "SubnetIds": [],
    "SecurityGroupId": "...",
    "MwaaEnvironmentName": "...",
    "RbacRoleName": "Admin",
    "MwaaEndpointIps": []
}

Run following commands:

cdk deploy QuickStartAlb

Integrate to multiple existing Amazon MWAA environments

If you need to use an Application Load Balancer (ALB) to provide OIDC based SSO to multiple exsiting MWAA environment with uniform Apache Airflow RBAC role access, you only need to complete the steps described below in this section. Under this option, all HTTPS traffic from your browser to the Amazon MWAA UI console flows directly, following successful OIDC based SSO.

Setup

Complete the prerequisites, and run following command:

source setup-venv.sh

For connecting to multiple existing Amazon MWAA environments, specify only the Amazon MWAA environment name in the JSON cdk.context.json file. Complete Oidc, Alb and CustomerVpc contexts and mention the Amazon MWAA environment names only in the MwaaEnvironments context. The setup process will create a new VPC with subnets hosting the ALB and the listener as defined by your CustomerVpc section configurations. You must define the CIDR range for this ALB VPC such that it does not overlap with the VPC CIDR range of your existing Amazon MWAA VPCs.

Example to integrate with two existing Amazon MWAA environments names "Env1" and "Env2":

"MwaaEnvironments": [
    {
    "Name": "Env1"
    },
    {
    "Name": "Env2"
    }
]

The Oidc context specifies the configuration of your OIDC Idp. For example, for Okta OIDC Idp, the configuration would be similar to shown below:

"Oidc": {
    "ClientId": "...",
    "ClientSecretArn": "...",
    "Issuer": "https://xxx.okta.com/oauth2/default",
    "AuthorizationEndpoint":"https://xxx.okta.com/oauth2/default/v1/authorize",
    "TokenEndpoint":"https://xxx.okta.com/oauth2/default/v1/token",
    "UserInfoEndpoint":"https://xxx.okta.com/oauth2/default/v1/userinfo"
}

The ALB may be internet facing, or private. By default, the ALB is private. Set InternetFacing to true below for internet facing ALB:

"Alb": {
    "InternetFacing": false,
    "SessionCookieName": "AWSELBAuthSessionCookie",
    "LogBucketArn": "...",
    "LogBucketPrefix": "customer-alb",
    "CertificateArn": "..."
}

Run following commands:

cdk bootstrap
cdk deploy CustomerVpc
cdk deploy MwaaAuthxLambda
cdk deploy CustomerAlb

Once the setup steps are complete, implement the Post deployment configuration steps. This includes adding the ALB CNAME record to the Amazon Route 53 DNS domain.

For integrating with existing Amazon MWAA environments configured using private access mode there are additional steps that need to be configured. These include configuring VPC peering and subnet routes between the new ALB VPC and the existing Amazon MWAA VPC. Additionally, you will need to configure network connectivity from your user-agent to the private ALB endpoint resolved by your DNS domain.

Additional Details:

Visit the Step-by-step tutorial section for details on the CDK stack that this solution uses.

Create a new Amazon MWAA environment

If you need to use an Application Load Balancer (ALB) to provide OIDC based SSO to a single new Amazon MWAA environment with uniform Apache Airflow RBAC role access, you only need to complete the steps described below in this section. Under this option, all HTTPS traffic from your browser to the Amazon MWAA UI console flows directly, following successful OIDC based SSO.

Setup

Complete the prerequisites, and run following command:

source setup-venv.sh

For creating a new Amazon MWAA environments, specify the Amazon MWAA environment configurations in the JSON cdk.context.json file. Additionally, complete Oidc, Alb and CustomerVpc contexts. The setup process will create a new VPC with subnets hosting the ALB and the HTTPS listener as defined by your CustomerVpc section configurations. It will also create a new VPC for your new Amazon MWAA environment in it. Finally it will create the VPC peering connections between the ALB VPC and the Amazon MWAA VPC.

You can define the WebServerAccessMode to be either PUBLIC_ONLY or PRIVATE_ONLY. You must define the CIDR range for this ALB VPC such that it does not overlap with the VPC CIDR range of your Amazon MWAA VPCs if the new Amazon MWAA environment is being created with PRIVATE_ONLY access. This is because for this solution to work, we need to establish VPC peering connection and subnet routes between the CustomerVpc and the VPC of the new Amazon MWAA Environment with PRIVATE_ONLY access.

The Oidc context specifies the configuration of your OIDC Idp. For example, for Okta OIDC Idp, the configuration would be similar to shown below:

"Oidc": {
    "ClientId": "...",
    "ClientSecretArn": "...",
    "Issuer": "https://xxx.okta.com/oauth2/default",
    "AuthorizationEndpoint":"https://xxx.okta.com/oauth2/default/v1/authorize",
    "TokenEndpoint":"https://xxx.okta.com/oauth2/default/v1/token",
    "UserInfoEndpoint":"https://xxx.okta.com/oauth2/default/v1/userinfo"
}

The ALB may be internet facing, or private. By default, the ALB is private. Set InternetFacing to true below for internet facing ALB:

"Alb": {
    "InternetFacing": false,
    "SessionCookieName": "AWSELBAuthSessionCookie",
    "LogBucketArn": "...",
    "LogBucketPrefix": "customer-alb",
    "CertificateArn": "..."
}

Define one Amazon MWAA configurations along with its VPC details as defined by the VpcCIDR, MaxAZs, NatGateways, PublicSubnetMask and PrivateSubnetMask fields.

Example to create a new large, public Amazon MWAA environment named "Env1":

"MwaaEnvironments": [
    {
        "Name": "Env1",
        "EnvironmentClass": "mw1.large",
        "SourceBucketArn": "...",
        "DagsS3Path": "dags",
        "RequirementsS3Path": "mwaa/requirements-mwaa.txt",
        "RequirementsS3ObjectVersion": "...",
        "MinWorkers": 2,
        "MaxWorkers": 16,
        "Schedulers": 2,
        "DagProcessingLogsLevel": "INFO",
        "SchedulerLogsLevel": "INFO",
        "TaskLogsLevel": "INFO",
        "WorkerLogsLevel": "INFO",
        "WebserverLogsLevel": "INFO",
        "WebServerAccessMode": "PUBLIC_ONLY", 
        "ConfigurationOptions": {
            "core.dag_run_conf_overrides_params": "True"
        },
        "AWSServiceRoleForAutoScalingArn": "...",
        "VpcCIDR": "172.30.0.0/16",
        "MaxAZs": 2,
        "NatGateways": 1,
        "PublicSubnetMask": 24,
        "PrivateSubnetMask": 18
    }]

Run following commands, replacing Env1 below in commands with the name of your Mwaa Environment:

cdk bootstrap
cdk deploy CustomerVpc
cdk deploy MwaaVpcEnv1
cdk deploy MwaaAuthxLambda
cdk deploy MwaaEnvironmentEnv1
cdk deploy CustomerAlb

Once the setup steps are complete, implement the Post deployment configuration steps. This includes adding the ALB CNAME record to the Amazon Route 53 DNS domain.

Additional Details:

Visit the Step-by-step tutorial section for details on the CDK stack that this solution uses.

Create multiple new Amazon MWAA environments

If you need to use an Application Load Balancer (ALB) to provide OIDC based SSO to a multiple new Amazon MWAA environment with uniform Apache Airflow RBAC role access, you only need to complete the steps described below in this section. Under this option, all HTTPS traffic from your browser to the Amazon MWAA UI console flows directly, following successful OIDC based SSO.

Setup

Complete the prerequisites, and run following command:

source setup-venv.sh

Follow the instruction steps for Create a new Amazon MWAA environment except one deviation: Instead of specifying one Amazon MWAA environment configuration in the MwaaEnvironments section of the JSON cdk.context.json file, append multiple Amazon MWAA definitions.

Example to create two new large Amazon MWAA environment named "Env1" and "Env2":

"MwaaEnvironments": [
    {
        "Name": "Env1",
        "EnvironmentClass": "mw1.large",
        "SourceBucketArn": "...",
        "DagsS3Path": "dags",
        "RequirementsS3Path": "mwaa/requirements-mwaa.txt",
        "RequirementsS3ObjectVersion": "...",
        "MinWorkers": 2,
        "MaxWorkers": 16,
        "Schedulers": 2,
        "DagProcessingLogsLevel": "INFO",
        "SchedulerLogsLevel": "INFO",
        "TaskLogsLevel": "INFO",
        "WorkerLogsLevel": "INFO",
        "WebserverLogsLevel": "INFO",
        "WebServerAccessMode": "PUBLIC_ONLY",
        "ConfigurationOptions": {
            "core.dag_run_conf_overrides_params": "True"
        },
        ...
    },
    {
        "Name": "Env2",
        "EnvironmentClass": "mw1.large",
        "SourceBucketArn": "...",
        "DagsS3Path": "dags",
        "RequirementsS3Path": "mwaa/requirements-mwaa.txt",
        "RequirementsS3ObjectVersion": "...",
        "MinWorkers": 2,
        "MaxWorkers": 16,
        "Schedulers": 2,
        "DagProcessingLogsLevel": "INFO",
        "SchedulerLogsLevel": "INFO",
        "TaskLogsLevel": "INFO",
        "WorkerLogsLevel": "INFO",
        "WebserverLogsLevel": "INFO",
        "WebServerAccessMode": "PRIVATE_ONLY",
        "ConfigurationOptions": {
            "core.dag_run_conf_overrides_params": "True"
        },
        ...
    }
]

Run following commands, replacing Env1 and Env2 below in commands with the name of your Mwaa Environment:

cdk bootstrap
cdk deploy CustomerVpc
cdk deploy MwaaVpcEnv1
cdk deploy MwaaVpcEnv2
cdk deploy MwaaAuthxLambda
cdk deploy MwaaEnvironmentEnv1
cdk deploy MwaaEnvironmentEnv2
cdk deploy CustomerAlb

Additional Details:

Visit the Step-by-step tutorial section for details on the CDK stack that this solution uses.

System perspective

The system perspective is useful for building and deploying this solution. This solution comprises of three core CloudFormation stacks defined using AWS CDK:

CustomerVpc
MwaaAuthxLambda
CustomerAlb

Besides the core stacks, this solution supports building Amazon MWAA Environment stacks. For each Amazon MWAA Environment you want to use in this solution, you must add a dictionary entry in the MwaaEnvironments array in cdk.context.json. If the array entry contains only the Name key, this solution assumes such an Amazon MWAA Environment is being managed outside this solution, otherwise, two logical stacks per Amazon MWAA Environment are created in this solution:

MwaaVpc
MwaaEnvironment

The cdk.context.json file included in this project is configured to create two new Amazon MWAA Environments: Env1 with PUBLIC_ONLY access, and Env2 with PRIVATE_ONLY access, which means following CloudFormation stacks are defined in this solution, in addition to the core stacks:

MwaaVpcEnv1
MwaaEnvironmentEnv1
MwaaVpcEnv2
MwaaEnvironmentEnv2

User perspective

The user perspective is useful for understanding how to access a targe Amazon MWAA Environment assuming a specific Airflow RBAC role.

Amazon MWAA Airflow console login and logout

For login into Apache Airflow console in the target Amazon MWAA Environment assuming a specific Apache Airflow RBAC role, we use following URL:

https://FQDN/aws_mwaa/aws-console-sso?mwaa_env=<MWAA-Environment-Name>&rbac_role=<Rbac-role-name>

For logout from an Apache Airflow console, we use the normal console logout.

SSO Logout

For SSO logout from ALB, we use following URL:

https://FQDN/logout

Prerequisites

Before we can deploy this solution, we need to complete following prerequisites:

AWS account access
CDK Build machine
DNS domain
Fully-qualified-domain (FQDN) name
SSL certificate
Open Id connect (OIDC) identity provider
Service linked role for EC2 auto-scaling
Amazon MWAA Environment source bucket
Application load balancer (ALB) access logging bucket

AWS account access

First, you need an AWS account. If needed, create an AWS account. This solution assumes you have system administrator job function access to the AWS Management Console.

CDK build machine

Next, you need a build machine. This solution uses AWS CDK to build the required stacks. You may use any machine with NodeJS, Python, Docker and AWS CDK for Typescript installed as your build machine. If you are new to AWS CDK, we recommend launching a fully-configured build machine in your target AWS region, as described below:

Select your AWS Region. The AWS Regions supported by this solution include, us-east-1, us-east-2, us-west-2, eu-west-1, eu-central-1, ap-southeast-1, ap-southeast-2, ap-northeast-1, ap-northeast-2, and ap-south-1.
If you do not already have an Amazon EC2 key pair, create a new Amazon EC2 key pair. You need the key pair name to specify the KeyName parameter when creating the AWS CloudFormation stack below.
Use the public internet address of your laptop as the base value for the CIDR to specify SecurityGroupAccessCIDR parameter in the CloudFormation template used below.
Using AWS Management console, create the build machine using cfn/ubuntu-developer-machine.yaml AWS CloudFormation template. This template creates AWS Identity and Access Management (IAM) resources, so when you create the CloudFormation Stack using the console, in the Review step, you must check I acknowledge that AWS CloudFormation might create IAM resources.
Once the stack status in CloudFormation console is CREATE_COMPLETE, find the EC2 instance launched in your stack in the Amazon EC2 console, and connect to the instance using SSH as user ubuntu, using your SSH key pair.
When you connect to the instance using SSH, if you see the message "Cloud init in progress.", disconnect and try later after about 10 minutes. If you see the message AWS developer machine is ready!, your build machine is ready.

DNS domain

Next, you need a DNS domain. You can use an existing DNS domain that you can administer, or create a new DNS domain using any DNS domain provider, e.g. Amazon Route 53.

FQDN for ALB

As noted at the outset, the central component of this solution is an ALB. The ALB in this solution only supports HTTPS traffic. This means we need to create an SSL certificate, which requires us to first select a fully-qualified domain name (FQDN). For example, if your DNS domain is example.com, you may select a FQDN alb-sso-mwaa.example.com.

You will need the FQDN for ALB while creating the SSL Certificate, and for configuring a user-friendly alias for the ALB, once the ALB is created in the step-by-step tutorial.

SSL certificate

Request an SSL certificate for the FQDN selected above. Later, you will set the Amazon Resource Name (ARN) of the SSL certificate in Alb CDK context variable CertificateArn in cdk.context.json while configuring the ALB stack in the step-by-step tutorial.

OIDC Idp

This solution requires configuration of an application client in an OIDC Idp. You must configure the application client in your OIDC Idp with a Client Secret.

You must create an AWS Secrets Manager secret to store your Client Secret in plain-text format (not JSON). Later, you will set the secret's ARN in Oidc context variable ClientSecretArn in cdk.context.json while configuring the ALB stack in the step-by-step tutorial.

The OIDC Idp must support scope of "openid email". The redirect_url and logout_url for your OIDC Idp must be set to https://FQDN/oauth2/idpresponse and https://FQDN/logout, respectively.

Service linked role for EC2 auto scaling

Create a service linked role for EC2 auto scaling. Later, you will set the ARN for this role in CDK context variable AWSServiceRoleForAutoScalingArn in cdk.context.json while configuring various VPC related stacks in the step-by-step tutorial.

MWAA Environment source bucket

If you plan to use this solution to automatically create Amazon MWAA Environments, create or use an existing Amazon S3 bucket with versioning enabled. Later, you will use the S3 bucket ARN in CDK context variable SourceBucketArn in various MWAAEnvironments array entries in cdk.context.json while configuring various Amazon MWAA Environment related stacks in the step-by-step tutorial.

At this time, copy requirements-mwaa.txt to the SourceBucketArn bucket to the bucket path mwaa/requirements-mwaa.txt. Note the object version of the object you just copied and later use it in RequirementsS3ObjectVersion in various MWAAEnvironments array entries in cdk.context.json while configuring various Amazon MWAA Environment related stacks in the step-by-step tutorial.

Application load balancer (ALB) access logging bucket

Create or use an existing Amazon S3 bucket. Later you will use the S3 bucket ARN in Alb CDK context variable LogBucketArn in cdk.context.json while configuring the ALB stack in the step-by-step tutorial.

The access logging bucket must have access logging bucket policy attached to it. An example access logging bucket policy for AWS Region us-west-2 is shown below:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": {
                "AWS": "arn:aws:iam::797873946194:root"
            },
            "Action": "s3:PutObject",
            "Resource": "<your-s3-bucket-ARN>/customer-alb/AWSLogs/<your-AWS-account-id>/*"
        }
    ]
}

The 797873946194 above refers to the AWS account id for AWS load-balancing service running in us-west-2, and this value for other AWS regions can be found here.

Step-by-step tutorial

To deploy the AWS CDK stacks in this solution, clone this github repository on your build machine. In the root directory of the cloned repository, execute setup-venv.sh shell script.

Below we describe the steps required to deploy this solution.

Configure CDK context

Below we describe how to configure the CDK context for following stacks:

Customer VPC stack
MwaaAuthxLambda stack
MwaaVpc stack
MwaaEnvironment stack
CustomerAlb stack

CustomerVpc stack

The CustomerVpc stack creates a secure VPC with private and public subnets for running an Application Load Balancer (ALB) that provides the user access endpoint.

The public subnets have direct access to the Internet. The private subnets have outbound access to the Internet via a NAT Gateway. VPC is connected to the relevant AWS services using VPC endpoints. VPC Flow Logs are enabled.

An example CustomerVpc CDK context defined in cdk.context.json is shown below:

"CustomerVpc": {
    "AWSServiceRoleForAutoScalingArn": "...",
    "VpcCIDR": "192.168.0.0/16",
    "MaxAZs": 2,
    "NatGateways": 1,
    "PublicSubnetMask": 24,
    "PrivateSubnetMask": 18
}

You are free to change the CustomerVpc context, as needed.

NOTE: The VpcCIDR of the CustomerVpc must not overlap with the VPC of any Amazon MWAA Environment with PRIVATE_ONLY access. This is because, for this solution to work, we need to establish VPC peering connection and subnet routes between the CustomerVpc and the VPC of an Amazon MWAA Environment with PRIVATE_ONLY access.

If the Amazon MWAA VPC is created by this solution, the required VPC peering connection and subnet routes are automatically configured. If you are directly managing an Amazon MWAA Environment with PRIVATE_ONLY access and want to access such an Amazon MWAA Environment through this solution, you must create VPC peering connection and subnet routes between CustomerVpc and your Amazon MWAA VPC.

MwaaAuthxLambda stack

This stack deploys the Lambda function used for authorization. The authorization function enables access to the various Amazon MWAA Environments' Apache Airflow UI consoles.

This stack creates an Amazon DynamoDB table used for mapping users and Amazon MWAA Environments to allowed Apache Airflow RBAC roles.

The CDK Alb context variable SessionCookieName defined in cdk.context.json is used by this stack.

MwaaVpc stack

The MwaaVpc stack creates a secure VPC with private and public subnets for running an MWAA Environment.

The public subnets have direct access to the Internet. The private subnets have outbound access to the Internet via a NAT Gateway. VPC is connected to the relevant AWS services using VPC endpoints. VPC Flow Logs are enabled.

The CDK context for each MwaaVpc is defined in each MwaaEnvironments array entry, as shown in the example below for two Amazon MWAA Environments named Env1 and Env2, respectively:

"MwaaEnvironments": [
    {
        "Name": "Env1",
            ...
        "AWSServiceRoleForAutoScalingArn": "...",
        "VpcCIDR": "172.30.0.0/16",
        "MaxAZs": 2,
        "NatGateways": 1,
        "PublicSubnetMask": 24,
        "PrivateSubnetMask": 18
    },
    {
        "Name": "Env2",
            ...
        "AWSServiceRoleForAutoScalingArn": "...",
        "VpcCIDR": "172.16.0.0/16",
        "MaxAZs": 2,
        "NatGateways": 1,
        "PublicSubnetMask": 24,
        "PrivateSubnetMask": 18
    }
],

NOTE: The VpcCIDR of the MwaaVpc must not overlap with the CustomerVpc if the Environment has PRIVATE_ONLY access. This is because for this solution to work, we need to establish VPC peering connection and subnet routes between the CustomerVpc and the VPC of any Amazon MWAA Environment with PRIVATE_ONLY access.

MwaaEnvironment stack

Each MwaaEnvironment stack depends on the corresponding MwaaVpc stack. The CDK context for each MwaaEnvironment stack is defined in MwaaEnvironments array entry, as shown in the example below for two Amazon MWAA Environments named Env1 and Env2, respectively:

"MwaaEnvironments": [
    {
        "Name": "Env1",
        "EnvironmentClass": "mw1.large",
        "SourceBucketArn": "...",
        "DagsS3Path": "dags",
        "RequirementsS3Path": "mwaa/requirements-mwaa.txt",
        "RequirementsS3ObjectVersion": "...",
        "MinWorkers": 2,
        "MaxWorkers": 16,
        "Schedulers": 2,
        "DagProcessingLogsLevel": "INFO",
        "SchedulerLogsLevel": "INFO",
        "TaskLogsLevel": "INFO",
        "WorkerLogsLevel": "INFO",
        "WebserverLogsLevel": "INFO",
        "WebServerAccessMode": "PUBLIC_ONLY",
        "ConfigurationOptions": {
            "core.dag_run_conf_overrides_params": "True"
        },
        ...
    },
    {
        "Name": "Env2",
        "EnvironmentClass": "mw1.large",
        "SourceBucketArn": "...",
        "DagsS3Path": "dags",
        "RequirementsS3Path": "mwaa/requirements-mwaa.txt",
        "RequirementsS3ObjectVersion": "...",
        "MinWorkers": 2,
        "MaxWorkers": 16,
        "Schedulers": 2,
        "DagProcessingLogsLevel": "INFO",
        "SchedulerLogsLevel": "INFO",
        "TaskLogsLevel": "INFO",
        "WorkerLogsLevel": "INFO",
        "WebserverLogsLevel": "INFO",
        "WebServerAccessMode": "PRIVATE_ONLY",
        "ConfigurationOptions": {
            "core.dag_run_conf_overrides_params": "True"
        },
        ...
    }
]

SourceBucketArn must point to an existing S3 bucket, and DagsS3Path and RequirementsS3Path must be valid for your bucket.

CustomerAlb stack

The CustomerAlb stack defines the following:

Application load balancer (ALB) used for OIDC SSO authentication
Authorization Lambda ALB target
HTTPS listener
Vpc peering connection and subnet Routes between CustomerVpc private subnets, and each MWAA Environment's VPC with PRIVATE_ONLY access. This is done only for Amazon MWAA Environments managed by this solution.

The CDK context for the CustomerAlb stack is defined in Oidc and Alb contexts in cdk.context.json. The Oidc context specifies the configuration of your OIDC Idp. For example, for Okta OIDC Idp, the configuration would be similar to shown below:

"Oidc": {
    "ClientId": "...",
    "ClientSecretArn": "...",
    "Issuer": "https://xxx.okta.com/oauth2/default",
    "AuthorizationEndpoint":"https://xxx.okta.com/oauth2/default/v1/authorize",
    "TokenEndpoint":"https://xxx.okta.com/oauth2/default/v1/token",
    "UserInfoEndpoint":"https://xxx.okta.com/oauth2/default/v1/userinfo"
},

The ALB may be internet facing, or private. By default, the ALB is private. Set InternetFacing to true below for internet facing ALB:

"Alb": {
    "InternetFacing": false,
    "SessionCookieName": "AWSELBAuthSessionCookie",
    "LogBucketArn": "...",
    "LogBucketPrefix": "customer-alb",
    "CertificateArn": "..."
},

Deploy CDK stacks

If you have never bootstrapped CDK in your selected AWS region, run following command:

cdk bootstrap

To list the stacks described above, execute following commands:

cdk list

If the command is successful, you should see stack list similar to the example below (your stack list may be different based on your configuration):

CustomerVpc
MwaaVpcEnv1
MwaaVpcEnv2
MwaaAuthxLambda
MwaaEnvironmentEnv1
MwaaEnvironmentEnv2
CustomerAlb

To deploy the stacks, execute following commands in sequence:

cdk deploy CustomerVpc
cdk deploy MwaaVpcEnv1
cdk deploy MwaaVpcEnv2
cdk deploy MwaaAuthxLambda
cdk deploy MwaaEnvironmentEnv1
cdk deploy MwaaEnvironmentEnv2
cdk deploy CustomerAlb

Post deployment configuration

Configure Vpc peering and subnet routes for external PRIVATE_ONLY MWAA Environments

If you are externally managing an Amazon MWAA Environment with PRIVATE_ONLY access and want to access such an Amazon MWAA Environment through this solution, you must create VPC peering connection and subnet routes between CustomerVpc and your Amazon MWAA VPC.

Add ALB CNAME record in your Route 53 DNS domain

In your Route 53 DNS domain, add a CNAME record for the ALB DNS name, which is available in the CDK output as CustomerAlb.AlbDnsName.

Add authorization records to DynamoDB table

In the DynamoDB table created in MwaaAuthxLambda stack, add entry for each user's email, Amazon MWAA Environment name, and allowed Apache Airflow RBAC roles.

For example, your Amazon DynamoDB table may look as below:

email	mwaa_env	rbac_roles
user1@example.com	Env1	All
user1@example.com	Env2	Viewer
user2@example.com	Env1	User Viewer
user2@example.com	Env2	User Public Op

Valid values for rbac_roles column are Admin, User, Viewer, Op, and Public. Multiple values in the rbac_roles column can be space-separated. The value All in rbac_roles means all RBAC roles are allowed.

Configure network connectivity to ALB and PRIVATE_ONLY Amazon MWAA Environments

If the Alb CDK context variable InternetFacing is set to false in cdk.context.json , configure network connectivity from your user-agent to the private ALB endpoint resolved by your DNS domain. Also, you must configure network connectivity from your user-agent to the Apache Airflow console in your target PRIVATE_ONLY access Amazon MWAA Environments. This can be done using AWS Direct Connect, or AWS Client VPN. This solution does not setup AWS Direct Connect, or AWS Client VPN.

Login into MWAA Airflow console

Assuming your ALB FQDN is alb-sso-mwaa.example.com, you can login into your target Amazon MWAA Environment, e.g. Env1, assuming a specific Apache Airflow RBAC role, e.g. Admin, using the following URL:

https://alb-sso-mwaa.example.com/aws_mwaa/aws-console-sso?mwaa_env=Env1&rbac_role=Admin

Allowed values for mwaa_env query parameter above are the available Amazon MWAA environments configured with this solution. Allowed values for rbac_role query parameter above are Admin, User, Viewer, Op, and Public.

Logout from Amazon MWAA Airflow console

For logout from an Apache Airflow Console, use the normal Airflow console logout.

Logout from ALB

Assuming your ALB FQDN is alb-sso-mwaa.example.com, logout from ALB using the following URL:

https://alb-sso-mwaa.example.com/logout

Update CDK stacks

To interactively update the deployed stacks, make the configuration changes in cdk.context.json and run:

cdk deploy --all

For some types of updates, you may need to destroy and redeploy at least some of the stacks.

Destroy CDK stacks

To interactively destroy all the deployed stacks, execute:

cdk destroy --all

To destroy the stacks one at a time, execute following commands in sequence:

cdk destroy CustomerAlb
cdk destroy MwaaEnvironmentEnv2
cdk destroy MwaaEnvironmentEnv1
cdk destroy MwaaAuthxLambda
cdk destroy MwaaVpcEnv2
cdk destroy MwaaVpcEnv1
cdk destroy CustomerVpc

Security

See CONTRIBUTING and CODE OF CONDUCT for more information.

License

This solution is licensed under the MIT-0 License. See the LICENSE file.

Name		Name	Last commit message	Last commit date
Latest commit History 36 Commits
cdk		cdk
cfn		cfn
images		images
CODE_OF_CONDUCT.md		CODE_OF_CONDUCT.md
CONTRIBUTING.md		CONTRIBUTING.md
LICENSE		LICENSE
README.md		README.md
setup-venv.sh		setup-venv.sh

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Application load balancer single-sign-on for Amazon MWAA

Overview

Solution architecture

Architecture for Quickstart

Architecture for Other use cases:

Applicable Use cases

Quick start

Setup

Integrate to multiple existing Amazon MWAA environments

Setup

Additional Details:

Create a new Amazon MWAA environment

Setup

Additional Details:

Create multiple new Amazon MWAA environments

Setup

Additional Details:

System perspective

User perspective

Amazon MWAA Airflow console login and logout

SSO Logout

Prerequisites

AWS account access

CDK build machine

DNS domain

FQDN for ALB

SSL certificate

OIDC Idp

Service linked role for EC2 auto scaling

MWAA Environment source bucket

Application load balancer (ALB) access logging bucket

Step-by-step tutorial

Configure CDK context

CustomerVpc stack

MwaaAuthxLambda stack

MwaaVpc stack

MwaaEnvironment stack

CustomerAlb stack

Deploy CDK stacks

Post deployment configuration

Configure Vpc peering and subnet routes for external PRIVATE_ONLY MWAA Environments

Add ALB CNAME record in your Route 53 DNS domain

Add authorization records to DynamoDB table

Configure network connectivity to ALB and PRIVATE_ONLY Amazon MWAA Environments

Login into MWAA Airflow console

Logout from Amazon MWAA Airflow console

Logout from ALB

Update CDK stacks

Destroy CDK stacks

Security

License

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