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@mostajs/rebac

v0.1.0

Published

ReBAC (Relationship-Based Access Control) pour @mostajs — tuples de relations + réaccessibilité par graphe via le moteur Prolog de @mostajs/rules. Composable en attribut/PIP dans abac/pbac.

Readme

@mostajs/rebac

Auteur : Dr Hamid MADANI [email protected] · Licence : AGPL-3.0-or-later Statut : ✅ 0.1.0 — 7 tests verts.

ReBAC (Relationship-Based Access Control) pour @mostajs — le 5e modèle du continuum. Décide via des relations entre entités (façon Google Zanzibar) : tuples directs + relations calculées, évaluées par le moteur Prolog de @mostajs/rules.

Symétrie : abac délègue ses conditions au moteur jsonlogic de rules ; rebac délègue la réaccessibilité au moteur Prolog de rules. Zéro réinvention.

Modèle

import { createRebac } from "@mostajs/rebac";

const rebac = createRebac({
  tuples: [
    { subject: "user:u7", relation: "member", object: "team:A" },
    { subject: "team:A",  relation: "owner",  object: "doc:1" },
  ],
  rules: [ // relations CALCULÉES = clauses Prolog can/3 (faits rel/3 + base can:-rel auto)
    { relation: "viewer", clause: "can(S, viewer, O) :- rel(T, owner, O), can(S, member, T)." },
  ],
});

await rebac.check("user:u7", "viewer", "doc:1"); // true (membre de l'équipe propriétaire)
await rebac.check("user:u9", "viewer", "doc:1"); // false (deny-by-default)

Intégration ABAC/PBAC (PIP inline, côté app)

ReBAC répond en asynchrone (graphe) ; ABAC/PBAC évaluent des conditions sync. Le pont est un PIP qui pré-calcule les relations en attributs — écrit par l'app (le « sac d'attributs » est le domaine de pbac, pas de rebac) :

import { authorize } from "@mostajs/pbac";

const pip = async (bag) => ({
  ...bag,
  environment: { ...bag.environment,
    canView: await rebac.check(`user:${bag.subject.id}`, "viewer", `doc:${bag.resource.id}`) },
});
// policy.condition : { "==": [ { var: "env.canView" }, true ] }
await authorize(bag, { set, pip });

Persistance

Les tuples durables passent par @mostajs/access-control-store (createDurableRelationStore, data-plug/ORM). Par défaut, rebac reste en mémoire.

Démos

node examples/demo.mjs              # graphe : relations directes + calculées
node examples/pbac-integration.mjs  # rebac → PIP → décision pbac