Andrew Wilson's Blog

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Azure RBAC Key Vault | Role Assignment for Specific Secret

Background Azure role-based access control (Azure RBAC) provides fine grained control over access to Azure resources. Azure RBAC is founded on top of the Azure Resource Manager which allows us to provide access authorisation at differing scope levels ranging from the Management Group through to individual resources. With RBAC enabled key vaults we can manage access to the resource and data stored in the vault. We can also manage access for individual keys, secrets, and certificates.

Posted by Andrew Wilson on Wednesday, November 22, 2023

Azure API Management | Unintentional Pass through of Subscription Key Header

Problem Space There is a potential unintentional side effect when you add a APIM subscription key as a header to an inbound request. The header is not stripped from the request prior to being sent to the configured backend service. Rather it is retained. If you manage the backing service and are not concerned with the disclosure of the subscription key, then no problem. However, being overly permissive of this information may make your API more vulnerable to security threats and disallows a separation of concerns.

Posted by Andrew Wilson on Tuesday, November 21, 2023

Bicep | Deployment Scope Hopping

Background An Azure Tenant is hierarchically structured with the following make up: Tenant One or more Management Groups One or more Subscriptions One or more Resource groups One or more Resources Deployment Scopes {Tenant, Management Group, Subscription, Resource Group} allow us to deploy respective types of resources at each level. A Scope is dictated by two attributes, the selected scope level, and the identifier of the item at that scope level.

Posted by Andrew Wilson on Tuesday, April 25, 2023

Bicep | Conditional Iterative Deployment

Background I have recently been looking at creating multiple of the same resource using Bicep. There is however a condition where I would wish for the set of resources not to be deployed. The following stages show my work through of this particular problem (using a storage account resource as an example): Conditional Deployment Conditional Deployment is used where you may or may not wish to deploy a given resource depending on the outcome of a given condition (if statement).

Posted by Andrew Wilson on Tuesday, April 11, 2023

Bicep Template | Shared Variable File Pattern

Background I have recently been playing around with some of the Bicep functions when I came across a pattern by Microsoft called the Shared Variable File Pattern. This nifty pattern describes a method in which you can extract what would either be commonly used or complex configuration values away from your Bicep Template. Using the pattern will allow you to retain easy to read and manageable Bicep templates where you have modelled large variable configurations and or configuration values that are used repeatedly across your templates (prevents multiple copies of the value that would need to be maintained).

Posted by Andrew Wilson on Wednesday, March 8, 2023