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Azure Key Vault is a service that provides centralized secrets management, with full control over access policies and audit history. When an app setting or connection string is a key vault reference, your application code can use it like any other app setting or connection string.

Grant the app access to Key Vault

2 Methods or models to authorize :

• Azure role-based access control: Assign the Key Vault Secrets User role to the managed identity.

• Vault access policy: Assign the Get secrets permission to the managed identity.

Access Network-restricted vaults

If Key Vault is configured with network restrictions, ensure that the app has network access. To make the vault accept traffic from a virtual network, execute the PowerShell :

Update-AzFunctionAppSetting -Name <app-name> -ResourceGroupName <group-name> -AppSetting @{vnetRouteAllEnabled = $true}

Access vaults with user-assigned identity

We need to set the keyVaultReferenceIdentity property to the resource ID of the user-assigned identity.

$identityResourceId = Get-AzUserAssignedIdentity -ResourceGroupName <group-name> -Name MyUserAssignedIdentityName | Select-Object -ExpandProperty Id
$appResourceId = Get-AzFunctionApp -ResourceGroupName <group-name> -Name <app-name> | Select-Object -ExpandProperty Id

$Path = "{0}?api-version=2021-01-01" -f $appResourceId
Invoke-AzRestMethod -Method PATCH -Path $Path -Payload "{'properties':{'keyVaultReferenceIdentity':'$identityResourceId'}}"