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ASPNET Authorization Policies — Fine-Grained Access Control in .NET

DodaTech Updated 2026-06-28 1 min read

In this tutorial, you'll learn about ASPNET Authorization Policies. We cover key concepts, practical examples, and best practices to help you understand and apply this topic effectively.

Policy-based authorization in ASP.NET Core separates access rules from controllers through reusable requirements and handlers.

// Custom requirement
public class ScanQuotaRequirement : IAuthorizationRequirement
{
    public int MinimumQuota { get; }
    public ScanQuotaRequirement(int minimumQuota) => MinimumQuota = minimumQuota;
}

public class ScanQuotaHandler : AuthorizationHandler<ScanQuotaRequirement>
{
    private readonly IScanQuotaService _quotaService;
    public ScanQuotaHandler(IScanQuotaService quotaService) => _quotaService = quotaService;

    protected override async Task HandleRequirementAsync(
        AuthorizationHandlerContext context, ScanQuotaRequirement requirement)
    {
        var userId = context.User.FindFirstValue(ClaimTypes.NameIdentifier);
        var remaining = await _quotaService.GetRemainingQuotaAsync(userId!);
        if (remaining >= requirement.MinimumQuota)
            context.Succeed(requirement);
    }
}

// Registration
builder.Services.AddAuthorization(options =>
{
    options.AddPolicy("HasScanQuota", policy =>
        policy.Requirements.Add(new ScanQuotaRequirement(10)));
});

Policy-based authorization enables maintainable, testable access control rules that can evolve independently of controllers.

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