Christian Nennemann
884d2dc836
- Rename `par` to `pred` (predecessor) in types, serialization, tests - Remove `pol`, `pol_decision` from core payload; move to `ect_ext` - Remove `sub` from payload (not part of ECT spec) - Update `typ` from `wimse-exec+jwt` to `exec+jwt` (accept both) - Rename MaxParLength to MaxPredLength everywhere - Update testdata, demos, READMEs with migration table - All Go tests pass, all 56 Python tests pass (90% coverage)
62 lines
2.8 KiB
Markdown
62 lines
2.8 KiB
Markdown
# WIMSE Execution Context Tokens — Reference Implementations
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> These reference implementations are aligned with **draft-nennemann-wimse-ect-01**.
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>
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> The following claim name changes from -00 have been applied:
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>
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> | -00 (previous) | -01 (current) | Notes |
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> |----------------|---------------|-------|
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> | `par` | `pred` | Predecessor task IDs |
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> | `pol`, `pol_decision` | removed (use `ect_ext`) | Policy claims moved to extension object |
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> | `sub` | not defined | Standard JWT claim, not part of ECT spec |
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> | `typ: wimse-exec+jwt` | `typ: exec+jwt` (preferred) | Both accepted for backward compat |
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> | `MaxParLength` | `MaxPredLength` | Renamed to match `pred` claim |
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This directory contains **reference implementations** of Execution Context Tokens (ECTs) for the WIMSE (Workload Identity in Multi System Environments) draft. Each refimpl provides ECT creation, verification, DAG validation, and an in-memory audit ledger.
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## Implementations
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| Language | Path | Description |
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|----------|-----------|-------------|
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| **Go** | [go-lang/](go-lang/) | Production-ready Go library and demo. Config via env; optional JTI replay cache. |
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| **Python** | [python/](python/) | Python 3.9+ library and demo. Same API surface and env-based config. |
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## Scope (all refimpls)
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- **ECT format**: JWT (JWS Compact Serialization) with required/optional claims per the spec.
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- **Creation**: Build and sign ECTs with ES256; `kid` and `typ` in the JOSE header.
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- **Verification**: Full verification procedure (parse, typ/alg, key resolution, signature, claims, optional DAG).
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- **DAG validation**: Uniqueness, predecessor existence, temporal ordering, acyclicity, predecessor policy.
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- **Ledger**: Interface plus in-memory append-only store.
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No WIT/WPT issuance or full WIMSE stack; refimpls use key resolution only. Suitable for conformance testing and as a template for production integrations.
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### Replay cache (multi-instance)
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The optional JTI replay cache (`JTICache` / `JtiCache`) is **in-memory only**. For multiple verifier instances behind a load balancer, replay detection must be shared. Use a distributed store (e.g. Redis, database) and implement the same contract as `JTISeen`: a function that returns true if the JTI was already seen, and ensure each verified JTI is recorded (e.g. with TTL). See go-lang/README and python/README for configuration and how to plug in a custom `JTISeen` / `jti_seen`.
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## Quick start
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**Go**
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```bash
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cd refimpl/go-lang && go run ./cmd/demo
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go test ./...
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```
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**Python**
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```bash
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cd refimpl/python && pip install -e . && python3 demo.py
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python3 -m pytest tests/ -v
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```
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## Specification
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- **Current draft**: `draft-nennemann-wimse-ect-01`
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- **Refimpl implements**: `-01` claim names
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## License
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Same as the Internet-Draft (IETF Trust). Code components under Revised BSD per BCP 78/79.
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