Sufficit.Identity.Core 1.26.902.357

Sufficit Identity Core

Shared contracts for authentication and authorization across every Sufficit product. This library is the single place where the vocabulary lives, so that a telephony screen, a finance report and an AI agent all answer the question "may this principal do this?" the same way.

Targets netstandard2.0 through net10.0, which is why it can be referenced from the .NET Framework 4.8 web application and from the newest services alike.

Why this is public

Security rests on the secrecy of keys, not of design — Kerckhoffs's principle, restated by Shannon as "the enemy knows the system". The OpenID Connect discovery document and the signing keys of the identity service are public by necessity; an integrator, or an attacker, can already read how the protocol works. What this documentation adds is a correct integration, not an attack surface.

The line we hold is not design versus no design. It is how it works (published) versus what we run (not published). Host names, addresses, ports, database names, real tenant identifiers and account identifiers belong to the operational inventory and never appear here. Every identifier in these documents is a deliberately fake example.

Documentation

Start with the concepts; the rest assumes that vocabulary.

The shape of an authorization decision

Three questions, three different answers:

• Scope — what the application may ask for. It belongs to the OAuth client, not to the person, which is why it appears on a consent screen.
• Role — a coarse grouping of a person inside a context. Drives navigation: which screens and links exist at all.
• Entitlement — a specific permission inside a specific context. Drives actions: which button is enabled, whether a save is allowed.

Roles keep granting from becoming an endless list. Entitlements keep each product free to define its own vocabulary. The two exist precisely because one compensates for the other.

Reading a decision in code

// May this principal read phone calls in this context?
if (principal.HasEntitlement<PhoneCallsEntitlement>(contextId))
{
    // ...
}

The context is always explicit. There is no ambient "current company": a principal may hold different permissions in different contexts at the same time, and a screen that shows several contexts at once is a normal case, not an exception.

Naming. The published vocabulary is entitlement, following RFC 9068 §2.2.3.2 and the SCIM semantics it borrows from (RFC 7643 §4.1.2). The rename is complete in this library. Consumers migrate by taking the new major version when they are ready; see the decision record.

Contributing

Documentation and identifiers are written in English. The team works from several places, and a shared vocabulary is worth more than a familiar one.