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Replicates users and groups from Active Directory into Snowflake
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LICENSE Initial commit Sep 6, 2018
README.md Add note on password replication Jul 1, 2019
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snoad.ps1 Support Snowflake role hierachies Feb 23, 2019

README.md

snoad

A Powershell script which replicates users and groups from Active Directory into Snowflake.

Quick Start

  1. Put this script on a domain-joined Windows machine with Powershell (install RSAT if it's a workstation OS, as the ActiveDirectory module is required).
  2. Install SnowSQL
  3. Call the script first using the -WhatIf parameter, and make sure you are comfortable with the actions it proposes. Don't forget to set the SNOWSQL_PWD environment variable in addition to providing the required parameters
  4. Schedule the script, preferably using a robust scheduling engine that will report failures

Script Behaviour

Using an Active Directory Organisational Unit (OU) as a source, the script retrieves all security groups within that OU, along with all users (including those within nested groups). For this reason, the script must be ran on a domain-connected Windows machine.

The list of all possible users is checked against Snowflake to ensure they all exist. If any are missing, they are either created or an error is raised, depending on the value of the createAnyMissingUsers parameter.

Note: Passwords are of course not replicated into Snowflake. Aside from this being a bad idea, there's no way to retrieve a password from AD, so you need a Single Sign On mechanism like Okta

For each security group immediately within the OU, a role in Snowflake is matched or created and all Snowflake users are granted it according to their membership in the AD security group. Any users who have subsequently been removed from the AD group will be revoked from the corresponding role.

If disableRemovedUsers is set to $true, any SSO-based Snowflake users (i.e. those without Snowflake passwords) will be disabled if they aren't part of any of the AD groups.

diagram

Example

.\snoad.ps1 -snowflakeAccount 'ly12345' -snowflakeUser 'usersync' -snowflakeRole 'ACCOUNTADMIN' -snowflakeRegion 'ap-southeast-2' -ouIdentity 'OU=AsiaPacific,OU=Sales,OU=UserAccounts,DC=FABRIKAM,DC=COM' -createAnyMissingUsers $true

Notes

You must have snowsql installed and on your path prior to running this function.

Does not incur compute costs as user account administration does not run in a warehouse.

This is a community-developed script, not an official Snowflake offering. It comes with no support.

License

This project is licensed under the MIT License - see the LICENSE file for details

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