Azure Key Vault wrapper for Laravel 8

Overview

This package allows secrets to be fetched from, or set in, an Azure Key Vault, with an interface similar to env() and config().

Installation

Require this package with composer:

composer require insites-consulting/azure-key-vault

The package should be discovered by Laravel on installation.

The following environment variables must be set, if the package's default configuration is used:

• AZURE_AD_CLIENT_ID the UUID of the service principal which will be used to access the vault. This service principal needs "Get Secret" permission on that vault.
• AZURE_AD_CLIENT_SECRET the shared secret for that service principal.
• AZURE_AD_TENANT_ID the UUID for the tenant under which that service principal exists.
• AZURE_KEY_VAULT_NAME the name of the key vault (used as a subdomain in its hostname; e.g. fred in fred.vault.azure.net).

This package publishes its configuration to vault.php. This can be done with:

php artisan vendor:publish --provider='InsitesConsulting\AzureKeyVault\ServiceProvider'

The configuration entries are as follows:

• tenant_id the tenant UUID
• client_id the service principal UUID
• client_secret the service principal shared secret
• vault the vault name

Usage

This package provides a facade called Vault, with three methods Vault::secret(), Vault::setSecret() and Vault::setVault(), as well as a global helper function secret().

To fetch a secret called 'apikey':

$secret = Vault::secret('apikey');

If the secret does not exist, null will be returned, unless a different default value is specified, as here:

$other_secret = Vault::secret('otherkey', 'default-value');

If there is an error, an InsitesConsulting\AzureKeyVault\AzureKeyVaultException will be thrown. Its message will be set to the body of the error response from Azure, and its code will be set to the HTTP status of that response.

The global helper function behaves identically to the facade method:

$secret = secret('apikey');
$other_secret = secret('otherkey', 'default-key');

To set a secret called 'apikey' to the value 'longsecretvalue':

Vault::setSecret('apikey', 'longsecretvalue');

This method is void, but will throw an InsitesConsulting\AzureKeyVault\AzureKeyVaultException on error, in the same manner as Vault::secret().

In order to work with multiple vaults, use Vault::setVault() to change the vault name used:

$secret = secret('apikey');
Vault::setVault('other-vault');
$other_secret = secret('apikey');

This is persistent: the newly set vault will remain until Vault::setVault() is called again.

Calling Vault::setVault() with no argument will reset the vault name to that set in the config file:

$other_secret = secret('apikey');
Vault::setVault();
$secret = secret('apikey');