This project is archived.

I'm no longer actively maintaining this project as my efforts are now focused on aws-sso-cli.

OneLogin AWS (Assume) Role

Project Status

This project is on indefinite pause as my efforts in this area have moved to AWS SSO CLI which uses AWS SSO instead of SAML.

About

Assume an AWS Role and get temporary credentials using OneLogin.

Users will be able to choose from among multiple AWS roles in multiple AWS accounts when they sign in using OneLogin in order to assume an AWS Role and obtain temporary AWS acccess credentials.

This is really useful for SRE/Engineering organizations that run complex environments with multiple AWS accounts, roles and many different people that need periodic access as it saves manually generating and managing AWS credentials.

Why?

Because the idea of running a Java application every I want AWS creds or dealing with dependency/package management in Python made me shudder in horror. I wanted a single binary and something that is cross-platform. Also, I wanted to provide a different user experience- no mixing of JSON and YAML for config files for example.

Lastly, I wanted something that was a bit more secure than these options and handled all the secrets more securely.

AWS and OneLogin prerequisites

Read what OneLogin has to say here.

Installation

Just run make (GNU Make!) to build a binary and copy it to a location in your $PATH.

Settings

OneLogin AWS Role has a single YAML configuration file: ~/.onelogin-aws-role.yaml

It contains the following sections:

OneLogin Config

This section defines the OAuth2 configuration necessary to talk to OneLogin API servers. You will need to get this from your administrator.

region: <OneLogin Region>
username: <OneLogin Username>
subdomain: <OneLogin Subdomain>
ip: <IP Address>
mfa: <device_id>

Where:

• region - One of us or eu depending on OneLogin server region to use (required)
• username - Your OneLogin username/email address (required)
• subdomain - Your organization's OneLoging subdomain (required)
• ip - Specify the IP to be used on the method to retrieve the SAMLResponse in order to bypass MFA if that IP was previously whitelisted. (optional)
• mfa - Default device_id for MFA to skip prompting (optional)

By default, the credentials only last for 1 hour, but you can edit that restriction on AWS and set a max of 12h session duration.

AWS Account Config

This section defines each of the AWS Account & Roles that may be used via AssumeRole.

apps:
    <app_id>:
        name: <Application Name>
        alias: <Application Alias>
        roles:
            - arn: <Role ARN>
              profile: <AWS Profile Name>
              region: <Default AWS Region>
              duration: <Number of Seconds>
              profile: <Profile Name>

Where:

• app_id - Is the Application ID provided by your administrator (required)
• name - Name of the OneLogin Application (optional)
• alias - Alias for OneLogin Application (optional)
• arn - AWS ARN to assume (required)
• profile - Friendly name of this role and section of AWS_PROFILE to write to ~/.aws/credentials (required)
• region - Configure the default AWS region. Default: us-east-1 (optional)

Note that you can configure multiple roles for each account, multiple accounts for each applications and multiple applications.

AWS Account Aliases

There is an optional section that can be created to give more human readable names to the account list.

aws_accounts:
    <account id>: <account alias/name>

Usage

Check your config

After you have edited your ~/.onelogin-aws-role.yaml config file, you can verify it by running onelogin-aws-role and you should see a list of AWS Accounts and Roles that you have configured.

Configure your OneLogin ClientId and Client Secret

All API calls to OneLogin require a valid Oauth access token. In order to get one of these tokens, you must first authenticate to the OneLogin service using the ClientId and Client Secret provided to you by your administrator. Both ClientId and Client Secrets are 64 character hex strings.

Set ClientId and Client Secret

onelogin-aws-role oauth set

Show ClientId and Client Secret

onelogin-aws-role oauth show

Execute command with an IAM Role

onelogin-aws-role exec <profile name> [command] [args...]

This will use the cached STS Session Token or ask you to authenticate to OneLogin and then execute the provided command & arguments using those credentials. If no command is specified, it will start a new interactive shell.

Note that all the necessary shell environment variables will be set:

• AWS_ACCESS_KEY_ID -- AWS Credential for authentication
• AWS_SECRET_ACCESS_KEY -- AWS Credential for authentication
• AWS_SESSION_TOKEN -- AWS Credential for authentication
• AWS_DEFAULT_REGION -- AWS region
• AWS_SESSION_EXPIRATION -- Date & Time this session token will expire
• AWS_ROLE_ARN -- Selected AWS Role ARN
• AWS_ENABLED_PROFILE -- note that this is different from AWS_PROFILE as we do not want to confuse clients that may try to load ~/.aws/config and ~/.aws/credentials.

Expire stored STS Session Token / Credentials

onelogin-aws-role expire <profile name>

This will force expire (zero out) the stored credentials and force you to re-authenticate to use this role again.

Other Files

onelogin-aws-role will create the following file(s):

• ~/.onelogin-aws-role.cache Contains SAML Assertions (good for ~3min) and the OneLogin bearer token (good for ~10hrs)

Environment Variables

The following environment variables are honored to specify defaults:

• ONELOGIN_AWS_DURATION -- Default number of minutes to request the STS Session to be good for
• AWS_DEFAULT_REGION -- Default AWS Region to make API calls to

License

This program is available under the terms of the GPLv3 License

Thanks

This README and project is heavily based on and includes content from OneLogin-Python-AWS-Assume-Role.