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MODLAN V82 · MULTI-TENANT ASSURANCE I

Isolation is an invariant.

V82 challenges the tenant boundary across objects, commands, workflows, evidence, exports and privileged services. It combines expected-deny testing, ownership semantics, async context preservation and evidence-backed verification into one enterprise assurance plane.

Enter Tenant Assurance →V81 Verification →

ISOLATION DOCTRINE

Privileged does not mean omnitenant.

V82 treats tenant authority as a server-resolved business boundary. Elevated roles, service credentials, URLs, request bodies and queue payloads cannot silently widen it.

DENY BY DEFAULT

A role or privileged credential does not grant access outside an explicitly resolved tenant/object authority chain.

SERVER-RESOLVED

Tenant authority is derived from authenticated server context and authoritative object relationships, not client-supplied tenant identifiers.

NEGATIVE-TESTED

Isolation is proven with expected-deny cases across reads, writes, links, exports, workflows, evidence, services, and ownership changes.

ASYNC-PRESERVED

Tenant scope survives queues, retries, replay, background work, cache derivation, and recovery operations.

EVIDENCE-BACKED

A tenant control is VERIFIED only when a source-bound exercise produces correlated proof of the expected allow/deny result.

ADMIN ≠ OMNITENANT

Administrative capability remains policy-governed; elevated role alone must not silently erase business tenant boundaries.

V82 · TENANT ASSURANCE COMMAND

Challenge the boundary. Preserve the tenant.

Operate a synthetic two-tenant laboratory for expected-deny tests, ownership semantics, async/service isolation, and authorization regression without customer identifiers, operational traffic, or persistent state.

ACTORTenant A investigator

SOURCETENANT A

TARGETTENANT B

COMMANDINSPECT

EXPECTED CONTROL RESULT

DENY before object payload is returned

Investigation · READ · evidence: actor + tenant context + object ref + policy + denial correlation

TENANT ESCAPE LAB

Identifier substitution

ENTRY: Authorized Tenant A object deep link

01replace object id with Tenant B id
02retain same authenticated session
03request protected object

PASS: Server resolves authoritative ownership and denies before protected render.

ABORT: Stop if any non-synthetic tenant/object identifier is present.

OWNERSHIP RULE

Claim

AUTHORITY: Tenant-scoped system of record
INHERITANCE: Assignment and Investigation inherit tenant from authoritative claim/program context.
TRANSFER: No implicit transfer. Explicit migration authority and audit evidence required.
FORBIDDEN: Client-supplied tenant_id may not override authoritative ownership.

SERVICE ISOLATION

Tenant-bound job envelope

ASYNC WORKER

Every durable job carries an authoritative tenant binding separate from untrusted payload fields.

FAIL CLOSED: Reject / quarantine jobs with missing, conflicting, or unverifiable tenant scope.

EVIDENCE: job id + service identity + authoritative tenant + payload tenant + decision

AUTHZ REGRESSION MATRIX12 CASES

INVESTIGATORINSPECTInvestigation:A-101ALLOW

INVESTIGATORINSPECTInvestigation:B-204DENY

ADJUSTERADVANCEClaim:A-77ALLOW

ADJUSTERADVANCEClaim:B-88DENY

AUDITORINSPECTEvidence:A-9ALLOW

AUDITORRESTOREEvidence:A-9DENY

ADMINHANDOFFWorkflow:B-14DENY

SERVICERESTOREAssignment:A-55ALLOW

SERVICERESTOREAssignment:A-55DENY

COUNSELOPENEvidence:A-9DENY

SIU_LEADERASSIGNInvestigation:A-101ALLOW

SIU_LEADERASSIGNInvestigation:B-204DENY

ISOLATION EXERCISE TRACEEPHEMERAL / SYNTHETIC

01Synthetic Tenant A / Tenant B laboratory armed. No customer tenant is connected.

TENANT AUTHORITY GRAPH

Context may flow. Authority may not leak.

V82 visualizes tenant authority as an invariant across identity, objects, workflows, evidence and background services. The foreign-tenant edge stays deny-by-default even when roles are elevated.

TENANT A AUTHORITY

TENANT B AUTHORITY

AUTHORITATIVEISOLATIONDENY CROSS-TENANT

SELECTED NODE

Workflow A-14

TENANT A · INHERITED CONTEXT

This node may participate in Tenant A context only after server-side authorization resolves the actor, object, role and command.

CLIENT TENANT FIELD: never authoritative
ADMIN ROLE: does not erase tenant boundary
ASYNC WORK: must preserve tenant envelope
VERIFIED: requires expected-deny evidence

VERIFICATION STATE

Designed controls become credible through expected-deny proof.

V82 inherits V81's evidence discipline. A tenant boundary can be DESIGNED or EXERCISED without being VERIFIED. Verification requires source-bound evidence showing that the expected authorization outcome occurred in the identified environment.

DESIGNED

Boundary rule, authoritative source, command and expected outcome are defined.

EXERCISED

A bounded synthetic allow/deny case ran against the intended control surface.

VERIFIED

Source-bound evidence proves the expected tenant result with correlation.

FAILED

Unexpected access, mutation, link, export or service scope requires containment and remediation.

V80 → V82

The object model now carries tenant authority.

V80 normalized objects, roles, workspaces, commands and context. V82 adds tenant authority as a non-negotiable dimension across every protected object relationship and execution path.

NEXT BUILD · V83

Multi-Tenant Assurance II.

V83 can stress-test privileged paths, support workflows, background jobs, exports, integrations, impersonation boundaries, tenant migrations, and deeper cross-tenant negative cases against the V82 isolation model.