build.security provides simple development and management for your organization's authorization policy. OPA-AspDotNetCore-Middleware is a .Net middleware intended for performing authorization requests against build.security PDP(Policy Decision Point)/OPA.

Before you start we recommend completing the onboarding tutorial.

Important note

To simplify the setup process, the following example uses a local build.security PDP instance. If you are already familiar with how to run your PDP, You can also run a PDP on you environment (Dev/Prod, etc).

In that case, don't forget to change the hostname and the port in your code.

To use the middleware add this to your startup.cs

services.AddBuildAuthorization(options =>
{
    options.Enable = true;
    options.BaseAddress = "http://localhost:8181";
    options.PolicyPath = "/v1/data/authz/allow";
    options.AllowOnFailure = false;
    options.Timeout = 5;
});

You can also add more context for the PDP authz decision using the Authorize attribute on a ASP.NET controller, as shown in the sample application.

1. BaseAddress: String. The address of the Policy Decision Point (PDP)

1. PolicyPath: String. Full path to the policy (including the rule) that decides whether requests should be authorized. /v1/data/authz/allow
2. AllowOnFailure: Boolean. "Fail open" mechanism to allow access to the API in case the policy engine is not reachable. Default is false.
3. IncludeBody: Boolean. Whether or not to pass the request body to the policy engine. Default is true.
4. IncludeHeaders: Boolean. Whether or not to pass the request headers to the policy engine. Default is true
5. Timeout: Boolean. Amount of time to wait before request is abandoned and request is declared as failed. Default is 1000ms.
6. Enable: Boolean. Whether or not to consult with the policy engine for the specific request. Default is true
7. IgnoreEndpoints- String array. Determines what endpoint should be excluded from authorization.
8. IgnoreRegex - String array. Determines what endpoints should be excluded from authorization using regex.

This is what the input received by the PDP would look like:

{
   "input":{
      "request":{
         "method":"GET",
         "query":[
            
         ],
         "path":"/static/js/0.chunk.js",
         "scheme":"http",
         "host":{
            "value":"localhost:5000",
            "hasValue":true,
            "host":"localhost",
            "port":5000
         }
      },
      "source":{
         "ipAddress":"::1",
         "port":64288
      },
      "destination":{
         "ipAddress":"::1",
         "port":5000
      },
      "resources":{
         "requirements":[
            
         ],
         "attributes":{
            
         }
      },
      "sample":"application"
   }
}

If everything works well you should receive the following response:

{
    "decision_id":"ef414180-05bd-4817-9634-7d1537d5a657",
    "result":true
}