tegwick
cb48d0702c
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Assistant: claude-code Assistant-Model: opus Assistant-Process: 735967@bnt-lap001 Assistant-Session: 5971967f-77f8-4ced-9e02-c6ef67040ffc
180 lines
8 KiB
Markdown
180 lines
8 KiB
Markdown
---
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id: FLEX-WP-0035
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type: workplan
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title: "Per-identity application access readback and readable protected-system registry for user-engine"
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domain: infotech
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repo: access-engine
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status: active
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owner: claude
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topic_slug: netkingdom
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created: "2026-10-09"
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updated: "2026-10-09"
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related: [USER-WP-0026, USER-WP-0028]
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state_hub_workstream_id: "cb9755fa-6824-5288-81c4-3aa2fbff1a9f"
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---
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user-engine (message `f1637c32`, 2026-10-09, routed by net-kingdom `19a0cbcd`)
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needs to show a signed-in person which applications they can use. Its
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`USER-WP-0026-T03` and `USER-WP-0028-T02` are `blocked_on` access-engine. The
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PEP stance is already fail-closed: no decision renders `unavailable`, and allow
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is never inferred from membership, platform role, registration, or a missing
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record.
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## What exists today (2026-10-09 review)
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- `POST /v1/batch_check` takes several resources in one call and returns one
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decision per resource, each with a `lifetime` (`expires_at`) per the decision
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envelope. Shape-wise this is close to request (1).
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- Caller auth authorizes the caller token against **every** `resource.system`
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in the batch (`cmd/flex-auth/main.go`, `/v1/batch_check`). The
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`flex-auth-user-engine` caller is bound to its own protected system, so a
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readback across other systems is a 403 today. That is correct behaviour for
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enforcement, and the reason this needs design rather than a config change.
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- There is no generic "may use this application" action. Each package has its
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own action vocabulary, so "access to system X" has no defined meaning yet.
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- There is no registry read endpoint. The protected-system registry is loaded
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from files and never served.
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## Define the readback contract
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```task
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id: FLEX-WP-0035-T01
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status: done
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priority: high
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state_hub_task_id: "0585a684-d462-5caa-937f-b1730efddbd8"
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```
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Decide the action that a readback evaluates per system: a declared
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`application.access` action each consumer package must opt into, versus a
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per-system mapping held in the registry. A system that declares nothing is
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returned as `not_applicable`, never allow. State per input class the
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revocation-visibility deadline the readback carries (§9.7). Decide whether the
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readback is a decision for audit purposes (decision record, emission) or an
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explicitly non-enforcing advisory read. A displayed allow must not be usable as
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a PEP decision by another system.
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Gate: written contract in `docs/` plus an ADR or decision record; reviewed with
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user-engine before code.
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2026-10-09: user-engine accepted the contract (message `f54df082`) with three
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amendments, now folded in: the `/v1/check` subject shape with `tenant`, the
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rendering table, and a separate `USER_ENGINE_READBACK_TOKEN_FILE`. Also added: a
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realm-level-claims-only rule. `FLEX-DEC-2026-019` is accepted.
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2026-10-09: activated by the founder. Draft contract
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`docs/application-access-readback.md` and `FLEX-DEC-2026-019` (proposed). Key
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finding: each pin loads one consumer's package, so no existing pin can answer
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across applications. The draft proposes a dedicated readback pin with
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multi-package mode, a `purpose: "readback"` binding that keeps decisions
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non-transferable, and a new optional `client_binding` manifest field. Sent to
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user-engine with four review questions. The gate closes on their reply.
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## Caller authorization for cross-system readback
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```task
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id: FLEX-WP-0035-T02
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status: done
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priority: high
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depends_on: [FLEX-WP-0035-T01]
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state_hub_task_id: "eb0b6a91-7750-553b-b87f-c4262eb9df07"
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```
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Add a distinct caller capability (readback scope) instead of widening the
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`flex-auth-user-engine` binding to other systems' check rights. The readback
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caller must not be able to obtain a decision that another system's PEP would
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accept, and its decisions must say so in the binding.
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Gate: tests prove a readback-scoped token gets 403 on `/v1/check` for a foreign
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system and is admitted only on the readback route.
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2026-10-09 done. `flex-auth serve-readback` is a separate subcommand that mounts
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no `/v1/check` or `/v1/batch_check` (404 there). `--readback-caller` is bound
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under the non-system key `application-readback`. `CheckRequest.purpose` is
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hashed into `request_digest`, `submitted_request_digest` and
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`approval_binding_digest`, but only when set, so enforcement digests are
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unchanged. `/v1/check` refuses a request that carries it. Tests:
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`cmd/flex-auth/readback_test.go`
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(`TestReadbackPrincipalCannotCheckOnEnforcementPin`,
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`TestReadbackHTTPCallerAndRequestShape`, `TestReadbackWithholdsUncommittedAllow`)
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and `pkg/api/purpose_test.go`.
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## Readable protected-system registry
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```task
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id: FLEX-WP-0035-T03
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status: done
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priority: medium
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depends_on: [FLEX-WP-0035-T01]
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state_hub_task_id: "5dbb3280-8490-58a5-a0bb-f3883e568f58"
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```
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Serve a read-only projection: system id, display name, key-cape client binding.
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Include the registry-snapshot digest so the catalogue is tied to the same
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snapshot that decisions record (G1, `FLEX-WP-0019`). Grants and revocations stay
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inside access-engine; user-domain admins get no grant surface from this work.
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Gate: endpoint plus schema, admitted only for the readback caller, tests.
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2026-10-09 done. `GET /v1/readback/systems`; optional `client_binding` on
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`protected_system_manifest`. Schemas `readback_request`, `readback_response`
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and `readback_systems` are checked against live service output
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(`TestReadbackShapesMatchSchemas`). schemaguard gained `maxItems` for this.
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## informed-decision declares `application.access`
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```task
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id: FLEX-WP-0035-T05
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status: wait
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priority: high
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blocked_on: message-from:informed-decision
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blocking_reason: "Source side done; informed-decision must agree to lifecycle v2 (its own lifecycle pin will run the same digest at the next rollout)."
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state_hub_task_id: "701cbd99-1a84-5290-8f66-15fa7f407d3b"
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```
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informed-decision is the first participant. Its `informed-decision.lifecycle`
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package reads `authentication_audience`, which the readback must not use
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(contract §3). Add an `application.access` rule over realm-level claims only,
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as a new package version with fixtures. Coordinate the version bump with
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informed-decision, because its own pin must run the same digest. Add
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`client_binding` to its registry entry.
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Gate: package valid with allow/deny fixtures, informed-decision agrees, and
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the rule reads no audience, authorized-party or client-scoped claim.
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2026-10-09 source done. `informed-decision.lifecycle` is now v2
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(`sha256:da01e045…`, `pin.json` updated). It adds `application.access`, which
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requires `purpose == "readback"` and the existing `human` bar: net-kingdom-admins,
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KeyCape AAL2 `pwd`+`otp` within 12h, platform tenant. It has no workload path
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and reads no audience or client-scoped claim. v1's twelve operations are
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unchanged. Eight Go cases cover it, plus a fixture showing that it denies
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without the readback purpose. The catalogue `examples/application-readback/`
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binds informed-decision to `https://kc.coulomb.social` /
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`informed-decision-approver`. `TestReadbackInformedDecisionCatalogue` proves the
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readback over the shipped files. The live lifecycle pin still runs v1 (image
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`bdac62bc`) until the T04 rollout. Waiting on informed-decision's agreement.
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## Deploy the readback pin
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```task
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id: FLEX-WP-0035-T04
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status: wait
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needs_human: true
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depends_on: [FLEX-WP-0035-T05]
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blocking_reason: "Live pin change on railiance01 needs founder go."
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priority: medium
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state_hub_task_id: "82a8a7e6-54e9-5262-a271-24ce2f161362"
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```
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Add `values/flex-auth-application-readback.yaml` (or a deploy manifest) for a
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dedicated `flex-auth-application-readback` pin, plus a test asserting that its
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package paths match each participant's own pin values (digest-equality, §4).
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Add the user-engine ingress rule, then get the founder's go for the rollout.
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Promised to user-engine (reply to `d7e02758`, 2026-10-10), so the values file
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must match: URL
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`http://flex-auth-application-readback.flex-auth.svc.cluster.local.:8080`
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(trailing dot, in-cluster only), caller token audience `flex-auth`
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(`serve-readback --caller-audience` default), readback caller
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`system:serviceaccount:user-engine:user-engine`.
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The pin ships with the image that contains `serve-readback`. Hand user-engine
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the evidence that unblocks `USER-WP-0026-T03`.
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