SSO Sync

Helping you populate AWS SSO directly with your Google Apps users

SSO Sync will run on any platform that Go can build for. It is available in the AWS Serverless Application Repository.

⚠️ there are breaking changes for versions >= 0.02

⚠️ >= 1.0.0-rc.5 groups to do not get deleted in AWS SSO when deleted in the Google Directory, and groups are synced by their email address

🤔 we hope to support other providers in the future

Why?

As per the AWS SSO Homepage:

AWS Single Sign-On (SSO) makes it easy to centrally manage access to multiple AWS accounts and business applications and provide users with single sign-on access to all their assigned accounts and applications from one place.

Key part further down:

With AWS SSO, you can create and manage user identities in AWS SSO’s identity store, or easily connect to your existing identity source including Microsoft Active Directory and Azure Active Directory (Azure AD).

AWS SSO can use other Identity Providers as well... such as Google Apps for Domains. Although AWS SSO supports a subset of the SCIM protocol for populating users, it currently only has support for Azure AD.

This project provides a CLI tool to pull users and groups from Google and push them into AWS SSO. ssosync deals with removing users as well. The heavily commented code provides you with the detail of what it is going to do.

References

• SCIM Protocol RFC
• AWS SSO - Connect to Your External Identity Provider
• AWS SSO - Automatic Provisioning

Installation

You can go get github.com/awslabs/ssosync or grab a Release binary from the release page. The binary can be used from your local computer, or you can deploy to AWS Lambda to run on a CloudWatch Event for regular synchronization.

Configuration

You need a few items of configuration. One side from AWS, and the other from Google Cloud to allow for API access to each. You should have configured Google as your Identity Provider for AWS SSO already.

You will need the files produced by these steps for AWS Lambda deployment as well as locally running the ssosync tool.

Google

First, you have to setup your API. In the project you want to use go to the Console and select API & Services > Enable APIs and Services. Search for Admin SDK and Enable the API.

You have to perform this tutorial to create a service account that you use to sync your users. Save the JSON file you create during the process and rename it to credentials.json.

you can also use the --google-credentials parameter to explicitly specify the file with the service credentials. Please, keep this file safe, or store it in the AWS Secrets Manager

In the domain-wide delegation for the Admin API, you have to specify the following scopes for the user.

• https://www.googleapis.com/auth/admin.directory.group.readonly
• https://www.googleapis.com/auth/admin.directory.group.member.readonly
• https://www.googleapis.com/auth/admin.directory.user.readonly

Back in the Console go to the Dashboard for the API & Services and select "Enable API and Services". In the Search box type Admin and select the Admin SDK option. Click the Enable button.

You will have to specify the email address of an admin via --google-admin to assume this users role in the Directory.

AWS

Go to the AWS Single Sign-On console in the region you have set up AWS SSO and select Settings. Click Enable automatic provisioning.

A pop up will appear with URL and the Access Token. The Access Token will only appear at this stage. You want to copy both of these as a parameter to the ssosync command.

Or you specific these as environment variables.

SSOSYNC_SCIM_ACCESS_TOKEN=<YOUR_TOKEN>
SSOSYNC_SCIM_ENDPOINT=<YOUR_ENDPOINT>

Local Usage

git clone https://github.com/awslabs/ssosync.git
cd ssosync/
make go-build

./ssosync --help

A command line tool to enable you to synchronise your Google
Apps (Google Workspace) users to AWS Single Sign-on (AWS SSO)
Complete documentation is available at https://github.com/awslabs/ssosync

Usage:
  ssosync [flags]

Flags:
  -t, --access-token string         AWS SSO SCIM API Access Token
  -d, --debug                       enable verbose / debug logging
  -e, --endpoint string             AWS SSO SCIM API Endpoint
  -u, --google-admin string         Google Workspace admin user email
  -c, --google-credentials string   path to Google Workspace credentials file (default "credentials.json")
  -g, --group-match strings         Google Workspace Groups filter query parameter, example: 'name:Admin* email:aws-*', see: https://developers.google.com/admin-sdk/directory/v1/guides/search-groups (You can specify this flag multiple times for OR clause)
  -h, --help                        help for ssosync
      --ignore-groups strings       ignores these Google Workspace groups
      --ignore-users strings        ignores these Google Workspace users
      --include-groups strings      include only these Google Workspace groups, NOTE: only works when --sync-method 'users_groups'
      --log-format string           log format (default "text")
      --log-level string            log level (default "info")
  -s, --sync-method string          Sync method to use (users_groups|groups) (default "groups")
  -m, --user-match string           Google Workspace Users filter query parameter, example: 'name:John* email:admin*', see: https://developers.google.com/admin-sdk/directory/v1/guides/search-users
  -v, --version                     version for ssosync

The function has two behaviour and these are controlled by the --sync-method flag, this behavior could be

1. groups: (default) The sync procedure work base on Groups, gets the Google Workspace groups and their members, then creates in AWS SSO the users (members of the Google Workspace groups), then the groups and at the end assign the users to their respective groups.
2. users_groups: (original behavior, previous versions) The sync procedure is simple, gets the Google Workspace users and creates these in AWS SSO Users; then gets Google Workspace groups and creates these in AWS SSO Groups and assigns users to belong to the AWS SSO Groups.

Flags Notes:

• --include-groups only works when --sync-method is users_groups
• --ignore-users works for both --sync-method values. Example: --ignore-users [email protected],[email protected] or [email protected],[email protected]
• --ignore-groups works for both --sync-method values. Example: --ignore-groups [email protected],[email protected]orSSOSYNC_IGNORE_GROUPS=[email protected],[email protected]`
• --group-match works for both --sync-method values and also in combination with --ignore-groups and --ignore-users. This is the filter query passed to the Google Workspace Directory API when search Groups, if the flag is not used, groups are not filtered.
• --user-match works for both --sync-method values and also in combination with --ignore-groups and --ignore-users. This is the filter query passed to the Google Workspace Directory API when search Users, if the flag is not used, users are not filtered.

NOTES:

1. Depending on the number of users and groups you have, maybe you can get AWS SSO SCIM API rate limits errors, and more frequently happens if you execute the sync many times in a short time.
2. Depending on the number of users and groups you have, --debug flag generate too much logs lines in your AWS Lambda function. So test it in locally with the --debug flag enabled and disable it when you use a AWS Lambda function.

AWS Lambda Usage

NOTE: Using Lambda may incur costs in your AWS account. Please make sure you have checked the pricing for AWS Lambda and CloudWatch before continuing.

Running ssosync once means that any changes to your Google directory will not appear in AWS SSO. To sync. regularly, you can run ssosync via AWS Lambda.

⚠️ You find it in the AWS Serverless Application Repository.

SAM

You can use the AWS Serverless Application Model (SAM) to deploy this to your account.

Please, install the AWS SAM CLI and GoReleaser.

Specify an Amazon S3 Bucket for the upload with export S3_BUCKET=<YOUR_BUCKET>.

Execute make package in the console. Which will package and upload the function to the bucket. You can then use the packaged.yaml to configure and deploy the stack in AWS CloudFormation Console.

Example

Build

aws cloudformation validate-template --template-body  file://template.yaml 1>/dev/null &&
sam validate &&
sam build

Deploy

sam deploy --guided

License

Apache-2.0