aws-vault like tool for Okta authentication
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README.md

aws-okta

aws-okta allows you to authenticate with AWS using your Okta credentials.

Installing

If you have a functional go environment, you can install with:

$ go get github.com/segmentio/aws-okta

See the wiki for more installation options like Linux packages and precompiled binaries.

MacOS

You can install with brew:

$ brew install aws-okta

Windows

See docs/windows.md for information on getting this working with Windows.

Usage

Adding Okta credentials

$ aws-okta add

This will prompt you for your Okta organization, custom domain, region, username, and password. These credentials will then be stored in your keyring for future use.

Exec

$ aws-okta exec <profile> -- <command>

Exec will assume the role specified by the given aws config profile and execute a command with the proper environment variables set. This command is a drop-in replacement for aws-vault exec and accepts all of the same command line flags:

$ aws-okta help exec
exec will run the command specified with aws credentials set in the environment

Usage:
  aws-okta exec <profile> -- <command>

Flags:
  -a, --assume-role-ttl duration   Expiration time for assumed role (default 15m0s)
  -h, --help                       help for exec
  -t, --session-ttl duration       Expiration time for okta role session (default 1h0m0s)

Global Flags:
  -b, --backend string   Secret backend to use [kwallet secret-service file] (default "file")
  -d, --debug            Enable debug logging

Exec for EKS and Kubernetes

aws-okta can also be used to authenticate kubectl to your AWS EKS cluster. Assuming you have installed kubectl, setup your kubeconfig and installed aws-iam-authenticator, you can now access your EKS cluster with kubectl. Note that on a new cluster, your Okta CLI user needs to be using the same assumed role as the one who created the cluster. Otherwise, your cluster needs to have been configured to allow your assumed role.

$ aws-okta exec <profile> -- kubectl version --short

Likewise, most Kubernetes projects should work, like Helm and Ark.

$ aws-okta exec <profile> -- helm version --short

Configuring your aws config

aws-okta assumes that your base role is one that has been configured for Okta's SAML integration by your Okta admin. Okta provides a guide for setting up that integration here. During that configuration, your admin should be able to grab the AWS App Embed URL from the General tab of the AWS application in your Okta org. You will need to set that value in your ~/.aws/config file, for example:

[okta]
aws_saml_url = home/amazon_aws/0ac4qfegf372HSvKF6a3/965

Next, you need to set up your base Okta role. This will be one your admin created while setting up the integration. It should be specified like any other aws profile:

[profile okta-dev]
role_arn = arn:aws:iam::<account-id>:role/<okta-role-name>
region = <region>

Your setup may require additional roles to be configured if your admin has set up a more complicated role scheme like cross account roles. For more details on the authentication process, see the internals section.

A more complex example

The aws_saml_url can be set in the "okta" ini section, or on a per profile basis. This is useful if, for example, your organization has several Okta Apps (i.e. one for dev/qa and one for prod, or one for internal use and one for integrations with third party providers). For example:

[okta]
# This is the "default" Okta App
aws_saml_url = home/amazon_aws/cuZGoka9dAIFcyG0UllG/214

[profile dev]
# This profile uses the default Okta app
role_arn = arn:aws:iam::<account-id>:role/<okta-role-name>

[profile integrations-auth]
# This is a distinct Okta App
aws_saml_url = home/amazon_aws/woezQTbGWUaLSrYDvINU/214
role_arn = arn:aws:iam::<account-id>:role/<okta-role-name>

[profile vendor]
# This profile uses the "integrations-auth" Okta app combined with secondary role assumption
source_profile = integrations-auth
role_arn = arn:aws:iam::<account-id>:role/<secondary-role-name>

[profile testaccount]
# This stores the Okta session in a separate item in the Keyring.
# This is useful if the Okta session is used or modified by other applications
# and needs to be isolated from other sessions. It is also useful for
# development versions or multiple versions of aws-okta running.
okta_session_cookie_key = okta-session-cookie-test
role_arn = arn:aws:iam::<account-id>:role/<okta-role-name>

The configuration above means that you can use multiple Okta Apps at the same time and switch between them easily.

Configuring Okta session and AWS assume role TTLs

The default TTLs for both Okta sessions and AWS assumed roles is 1 hour. This means that aws-okta will re-authenticate to Okta and AWS credentials will expire every hour. In addition to specifying the Okta session and AWS assume role TTLs with the command-line flags, they can be set using the AWS_SESSION_TTL and AWS_ASSUME_ROLE_TTL environment variables respectively.

export AWS_SESSION_TTL=1h
export AWS_ASSUME_ROLE_TTL=1h

The AWS assume role TTL can also be set per-profile in the aws config:

# example with a role that's configured with a max session duration of 12 hours
[profile ttldemo]
aws_saml_url = home/amazon_aws/cuZGoka9dAIFcyG0UllG/214
role_arn = arn:aws:iam::<account-id>:role/<okta-role-name>
assume_role_ttl = 12h

Multi-factor Authentication (MFA) configuration

If you have a single MFA factor configured, that factor will be automatically selected. By default, if you have multiple available MFA factors, then you will be prompted to select which one to use. However, if you have multiple factors and want to specify which factor to use, you can do one of the following:

  • Specify on the command line with --mfa-provider and --mfa-factor-type
  • Specify with environment variables AWS_OKTA_MFA_PROVIDER and AWS_OKTA_MFA_FACTOR_TYPE
  • Specify in your aws config with mfa_provider and mfa_factor_type

Backends

We use 99design's keyring package that they use in aws-vault. Because of this, you can choose between different pluggable secret storage backends just like in aws-vault. You can either set your backend from the command line as a flag, or set the AWS_OKTA_BACKEND environment variable.

For Linux / Ubuntu add the following to your bash config / zshrc etc:

export AWS_OKTA_BACKEND=secret-service

Releasing

Pushing a new tag will cause Circle to automatically create and push a linux release. After this is done, you should run (from a mac):

$ export CIRCLE_TAG=`git describe --tags`
$ make release-mac

Analytics

aws-okta includes some usage analytics code which Segment uses internally for tracking usage of internal tools. This analytics code is turned off by default, and can only be enabled via a linker flag at build time, which we do not set for public github releases.

Internals

Authentication process

We use the following multiple step authentication:

  • Step 1 : Basic authentication against Okta
  • Step 2 : MFA challenge if required
  • Step 3 : Get AWS SAML assertion from Okta
  • Step 4 : Assume base okta role from profile with the SAML Assertion
  • Step 5 : Assume the requested AWS Role from the targeted AWS account to generate STS credentials