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Hashicorp Vault

What is Vault​

From https://vaultproject.io

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Secure, store and tightly control access to tokens, passwords, certificates, encryption keys for protecting secrets and other sensitive data using a UI, CLI, or HTTP API.

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This is based on authentik 2022.2.1 and Vault 1.9.3. Instructions may differ between versions. This guide does not cover vault policies. See https://learn.hashicorp.com/tutorials/vault/oidc-auth?in=vault/auth-methods for a more in depth vault guide

Preparation​

The following placeholders will be used:

  • authentik.company is the FQDN of authentik.
  • vault.company is the FQDN of Vault.

Step 1​

In authentik, create an OAuth2/OpenID Provider (under Resources/Providers) with these settings:

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Only settings that have been modified from default have been listed.

Protocol Settings

  • Name: Vault

  • Signing Key: Select any available key

  • Redirect URIs/Origins:

https://vault.company/ui/vault/auth/oidc/oidc/callback
https://vault.company/oidc/callback
http://localhost:8250/oidc/callback
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Take note of the Client ID and Client Secret, you'll need to give them to Vault in Step 3.

Step 2​

In authentik, create an application (under Resources/Applications) which uses this provider. Optionally apply access restrictions to the application using policy bindings.

note

Only settings that have been modified from default have been listed.

  • Name: Vault
  • Slug: vault-slug
  • Provider: Vault

Step 3​

Enable the oidc auth method vault auth enable oidc

Configure the oidc auth method, oidc discovery url is the OpenID Configuration Issuer in your provider

vault write auth/oidc/config \
         oidc_discovery_url="https://authentik.company/application/o/vault-slug/" \
         oidc_client_id="Client ID" \
         oidc_client_secret="Client Secret" \
         default_role="reader"

Create the reader role

vault write auth/oidc/role/reader \
      bound_audiences="Client ID" \
      allowed_redirect_uris="https://vault.company/ui/vault/auth/oidc/oidc/callback" \
      allowed_redirect_uris="https://vault.company/oidc/callback" \
      allowed_redirect_uris="http://localhost:8250/oidc/callback" \
      user_claim="sub" \
      policies="reader"

You should then be able to sign in via OIDC vault login -method=oidc role="reader"