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docs(README): match repo project pattern (#27 intermediate) 

Replace MIT placeholder with the standard intermediate-project README
shape used by sbom-generator, secrets-scanner, etc:
- Block-character ASCII banner (CRE)
- Project #27 / Crystal / AGPLv3 / Postgres badges
- One-line description quote -> learn modules pointer
- What It Does (bulleted feature list)
- Quick Start with both clone-and-build and install.sh paths
- just hint with install one-liner
- Demo tiers + daemon usage code blocks
- Flagship Rotators table
- ASCII architecture diagram
- Three-layer audit log diagram (own section)
- Stack section (language + deps + FFI note + testing)
- Configuration pointer (CONFIGURATION.md)
- Learn modules table
- AGPL 3.0 license footer

Also swapped LICENSE from MIT to AGPL v3 to match the rest of the
intermediate projects.
This commit is contained in:
CarterPerez-dev 2026-04-29 01:50:30 -04:00
parent 225716d140
commit 99d89b3050
2 changed files with 758 additions and 117 deletions
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MIT License GNU AFFERO GENERAL PUBLIC LICENSE
Version 3, 19 November 2007
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201
PROJECTS/intermediate/credential-rotation-enforcer/README.md
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@ -3,83 +3,90 @@
README.md README.md
--> -->
# Credential Rotation Enforcer (`cre`) ```regex
██████╗██████╗ ███████╗
██╔════╝██╔══██╗██╔════╝
██║ ██████╔╝█████╗
██║ ██╔══██╗██╔══╝
╚██████╗██║ ██║███████╗
╚═════╝╚═╝ ╚═╝╚══════╝
```
> A Crystal daemon that tracks credentials, enforces rotation policies as code, and executes the four-step rotation contract against AWS Secrets Manager, HashiCorp Vault, GitHub fine-grained PATs, and local `.env` files. Single binary. Live TUI. Tamper-evident audit log. Bidirectional Telegram bot. Signed compliance evidence export. [![Cybersecurity Projects](https://img.shields.io/badge/Cybersecurity--Projects-Project%20%2327%20intermediate-red?style=flat&logo=github)](https://github.com/CarterPerez-dev/Cybersecurity-Projects/tree/main/PROJECTS/intermediate/credential-rotation-enforcer)
[![Crystal](https://img.shields.io/badge/Crystal-1.20+-black?style=flat&logo=crystal&logoColor=white)](https://crystal-lang.org)
[![License: AGPLv3](https://img.shields.io/badge/License-AGPL_v3-purple.svg)](https://www.gnu.org/licenses/agpl-3.0)
[![PostgreSQL](https://img.shields.io/badge/PostgreSQL-16-336791?style=flat&logo=postgresql&logoColor=white)](https://www.postgresql.org)
[![Crystal](https://img.shields.io/badge/crystal-1.20+-black?logo=crystal)](https://crystal-lang.org) > Credential rotation enforcer written in Crystal. Tracks credentials, evaluates compile-time-checked policies, and executes the four-step rotation contract against AWS Secrets Manager, HashiCorp Vault, GitHub fine-grained PATs, and local `.env` files. Single binary, live TUI, bidirectional Telegram bot, tamper-evident audit log, signed compliance evidence export.
[![License: MIT](https://img.shields.io/badge/license-MIT-green.svg)](LICENSE)
[![Tests](https://img.shields.io/badge/tests-200+-brightgreen)](spec/)
--- *This is a quick overview — security theory, architecture, and full walkthroughs are in the [learn modules](#learn). Operator setup lives in [CONFIGURATION.md](CONFIGURATION.md).*
## What this is ## What It Does
A senior+ portfolio implementation of an enterprise credential rotation enforcer, built end-to-end in Crystal. The code is the lesson - every architectural choice (event bus, plugin macros, AEAD envelope, hash-chained audit log, three demo tiers) is intentional and explained in `learn/`. - Compile-time-checked policy DSL (typo'd action symbols, missing fields, bad credential property references all fail `crystal build`)
- Bus + plugin architecture — typed events fan out across Crystal channels; subscribers (audit, TUI, Telegram, log) react independently; rotators register at compile time via `register_as :kind` macro
- Four-step rotation contract (`generate → apply → verify → commit`) borrowed from AWS Secrets Manager's rotation Lambda template, dual-version safe under concurrent reads
- Three-layer tamper-evident audit log: SHA-256 hash chain + ratcheting HMAC-SHA256 + Ed25519-signed Merkle batches
- AEAD envelope encryption (AES-256-GCM, per-row DEKs wrapped by KEK, AAD-bound to credential identity, reserved `algorithm_id` byte for crypto agility)
- Hand-rolled live TUI (no external TUI framework — stdlib ANSI escapes only) with event-driven repaints coalesced to a tick interval
- Bidirectional Telegram bot — viewer tier (`/status`, `/queue`, `/history`) + operator tier (`/rotate`, `/snooze`)
- Compliance evidence export bundle (signed ZIP with audit log, Merkle batches, control mapping for SOC 2 / PCI-DSS / ISO 27001 / HIPAA)
This is **not** a wrapper around HashiCorp Vault or AWS Secrets Manager. It is its own coherent enforcer that talks *to* those systems via their HTTP APIs (real SigV4, real bearer auth, real lease tokens). ## Quick Start
## What it does
1. **Tracks** credentials in an inventory (PostgreSQL or SQLite).
2. **Evaluates** Crystal-DSL policies that compile-time-check for typos, missing fields, and bad enum values.
3. **Rotates** credentials using AWS Secrets Manager's four-step contract (`generate -> apply -> verify -> commit`) with dual-version safety so concurrent consumers never crash mid-rotation.
4. **Records** every event in a tamper-evident audit log: SHA-256 hash chain + ratcheting HMAC-SHA256 + Ed25519-signed Merkle batches.
5. **Encrypts** stored credentials at rest with AES-256-GCM AEAD, per-row DEKs wrapped by a KEK, AAD-bound to credential identity.
6. **Notifies** via structured logs and a bidirectional Telegram bot supporting `/status`, `/rotate <id>`, `/snooze`, `/history`, `/queue`.
7. **Exports** signed compliance evidence bundles mapping audit events to SOC 2 / PCI-DSS / ISO 27001 / HIPAA controls.
8. **Renders** a hand-rolled live TUI (no `crysterm` dependency) showing active rotations, recent events, and KEK version, repainted at most every 200ms.
## Quick start
### Tier 1 - Zero-deps demo (under 30 seconds)
```bash ```bash
git clone <repo> && cd PROJECTS/intermediate/credential-rotation-enforcer git clone https://github.com/CarterPerez-dev/Cybersecurity-Projects.git
shards install && shards build cre cd Cybersecurity-Projects/PROJECTS/intermediate/credential-rotation-enforcer
shards install && shards build cre --release
./bin/cre demo ./bin/cre demo
``` ```
You'll see live narration of an in-memory SQLite + tempfile rotation, with audit-chain verification at the end. Or use the install script:
### Tier 2 - Full mocked stack (under 2 minutes)
```bash ```bash
just demo-full curl -fsSL https://raw.githubusercontent.com/CarterPerez-dev/Cybersecurity-Projects/main/PROJECTS/intermediate/credential-rotation-enforcer/scripts/install.sh | bash
``` ```
Brings up Docker Compose with PostgreSQL 16, LocalStack (AWS Secrets Manager), HashiCorp Vault dev mode, and a fake-GitHub Flask service. CRE talks to all four with real network calls. > [!TIP]
> This project uses [`just`](https://github.com/casey/just) as a command runner. Type `just` to see all available recipes.
>
> Install: `curl -sSf https://just.systems/install.sh | bash -s -- --to ~/.local/bin`
### Tier 3 - Real cloud ### Demo tiers
Edit `config/demo-full.cr.example` and set env vars to point at your real AWS account / Vault server / GitHub Apps token. Then `cre run --db=postgres://...`. ```bash
just demo # Tier 1 — zero-deps SQLite + .env rotator (under 30s)
just tui-demo # Live TUI preview with synthetic events (8s, no setup)
just demo-full # Tier 2 — Docker Compose: PG + LocalStack + Vault + fake-GH
just demo-full-down # tear down the stack
```
## Subcommands ### Daemon usage
| Command | Purpose | ```bash
|---|---| cre run --db=sqlite:cre.db # headless daemon
| `cre run` | Headless daemon (production / systemd) | cre watch --db=sqlite:cre.db # daemon + live TUI
| `cre watch` | Engine + live TUI in same process | cre check --db=sqlite:cre.db --output=json # one-shot CI gate
| `cre check` | One-shot policy evaluation; exit code reflects violations | cre rotate <credential-id> # manual rotation
| `cre rotate <id>` | Manually rotate a single credential | cre policy list # inspect compiled policies
| `cre policy list / show <name>` | Inspect compiled-in policies | cre audit verify # check hash chain integrity
| `cre export --framework=soc2` | Generate signed compliance evidence ZIP | cre export --framework=soc2 --out=evidence.zip # signed compliance bundle
| `cre audit verify` | Verify hash chain + HMAC ratchet + Merkle batch signatures | ```
| `cre demo` | Tier 1 zero-deps demo |
| `cre version` | Print version |
## The flagship rotators `cre check` exits 1 when any credential violates its policy — drop into any CI pipeline.
## Flagship Rotators
| Rotator | What it talks to | Auth | | Rotator | What it talks to | Auth |
|---|---|---| |---|---|---|
| AWS Secrets Manager | `secretsmanager.us-east-1.amazonaws.com` | SigV4 (rolled from scratch in `src/cre/aws/signer.cr`) | | AWS Secrets Manager | `secretsmanager.<region>.amazonaws.com` | SigV4 (rolled from scratch in `src/cre/aws/signer.cr`) |
| HashiCorp Vault | `vault read database/creds/<role>` + lease revoke | `X-Vault-Token` | | HashiCorp Vault | `vault read database/creds/<role>` + lease revoke | `X-Vault-Token` |
| GitHub fine-grained PATs | `POST/DELETE /user/personal-access-tokens` | `Bearer ghp_...` | | GitHub fine-grained PATs | `POST/DELETE /user/personal-access-tokens` | `Bearer ghp_...` |
| Local `.env` file | atomic temp+rename | n/a | | Local `.env` file | atomic temp+rename | n/a |
Adding a fifth rotator means dropping a single file in `src/cre/rotators/`. The `register_as :kind` macro hooks it into the registry at compile time. Adding a fifth rotator means dropping a single file in `src/cre/rotators/` — the `register_as :kind` macro hooks it into the registry at compile time. Zero changes to the orchestrator, scheduler, or any subscriber.
## Architecture at a glance ## Architecture
``` ```
┌──────────────────────────────────────┐ ┌──────────────────────────────────────┐
@ -91,69 +98,63 @@ Adding a fifth rotator means dropping a single file in `src/cre/rotators/`. The
└────────────┘ │ │ │ │ │ │ │ └────────────┘ │ │ │ │ │ │ │
│ ┌──▼──┐ ┌▼────┐ ┌▼──┐ ┌▼──┐ ┌▼───┐ │ │ ┌──▼──┐ ┌▼────┐ ┌▼──┐ ┌▼──┐ ┌▼───┐ │
│ │Rot. │ │Audit│ │TUI│ │Tg │ │Pol.│ │ │ │Rot. │ │Audit│ │TUI│ │Tg │ │Pol.│ │
│ │Reg. │ │Log │ │ │ │Bot│ │Eval│ │ │ │Wrkr │ │Sub │ │Sub│ │Bot│ │Eval│ │
│ └──┬──┘ └──┬──┘ └───┘ └───┘ └────┘ │ │ └──┬──┘ └──┬──┘ └───┘ └───┘ └────┘ │
│ └──────┴──────────────┐ │ │ │ │ │
│ │ │ │ ▼ ▼ │
│ ┌────────────▼────────┐ │ │ ┌──────────────────────────────┐ │
│ │ Persistence │ │ │ │ Persistence (PG / SQLite) │ │
│ │ (PG / SQLite) │ │ │ │ + 3-layer audit integrity │ │
│ └─────────────────────┘ │ │ └──────────────────────────────┘ │
└──────────────────────────────────────┘ └──────────────────────────────────────┘
``` ```
All components are fibers in one OS process. The bus is in-process - Crystal channels are nanosecond-scale. All long-lived components are fibers in one OS process. The bus is in-process (Crystal channels are nanosecond-scale) so the architectural overhead is essentially free. Per-subscriber overflow policy: `Block` for audit (compliance — never drop), `Drop` for TUI / metrics / Telegram (best-effort).
## Project layout ## The Three-Layer Audit Log
``` ```
credential-rotation-enforcer/ Layer 3 ─ Ed25519-signed Merkle batches → auditor verifies with public key only
├── shard.yml Crystal manifest (1.20+) Layer 2 ─ HMAC ratchet (key zeroized per rotation) → past entries unforgeable
├── justfile build / test / demo / lint recipes Layer 1 ─ SHA-256 hash chain → any single-row tampering breaks forward chain
├── policies/ USER policy files (compiled in) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
├── src/cre/ Postgres ─ append-only via TRIGGER + role grants (INSERT-only)
│ ├── cli/ subcommand dispatch + 9 commands
│ ├── tui/ ANSI primitives + 4-panel live monitor
│ ├── engine/ scheduler, event bus, lifecycle, orchestrator
│ ├── events/ typed event hierarchy
│ ├── rotators/ registry + 4 flagship rotators
│ ├── policy/ macro DSL + evaluation engine
│ ├── audit/ hash chain + HMAC ratchet + Merkle + Ed25519
│ ├── crypto/ AES-256-GCM envelope, KEK/DEK
│ ├── persistence/ PG + SQLite adapters (same interface)
│ ├── notifiers/ structured log + Telegram bidirectional bot
│ ├── compliance/ SOC2/PCI/ISO/HIPAA control mapping + bundle export
│ ├── aws/ SigV4 signer + Secrets Manager client
│ ├── vault/ dynamic-secrets HTTP client
│ ├── github/ fine-grained PAT API client
│ └── demo/ Tier 1 demo
├── docker/ Tier 2 docker-compose stack (PG + LocalStack + Vault + fake-GH)
├── spec/ 200+ unit + integration tests
└── learn/ walkthrough docs (this is the teaching folder)
``` ```
## Read the walkthrough `cre audit verify` walks all three layers and reports which (if any) is broken.
- [`learn/00-OVERVIEW.md`](learn/00-OVERVIEW.md) - quick start, prerequisites, three-tier demo path ## Stack
- [`learn/01-CONCEPTS.md`](learn/01-CONCEPTS.md) - rotation theory, real breaches that motivated the design, framework controls
- [`learn/02-ARCHITECTURE.md`](learn/02-ARCHITECTURE.md) - bus + plugin design, persistence layers, crypto stack
- [`learn/03-IMPLEMENTATION.md`](learn/03-IMPLEMENTATION.md) - code-level walkthrough; where to look in the source for each concept
- [`learn/04-CHALLENGES.md`](learn/04-CHALLENGES.md) - 10 extension challenges (beginner -> advanced)
## Running the test suite **Language:** Crystal 1.20+
```bash **Dependencies:** crystal-db (DB abstraction), crystal-pg (PostgreSQL), crystal-sqlite3 (SQLite), tourmaline (Telegram framework, used minimally), webmock.cr (test HTTP mocks)
crystal spec # all 200+ tests
crystal spec spec/unit # unit only (no DB required) **Direct LibCrypto FFI** for AES-256-GCM AEAD (Crystal stdlib `OpenSSL::Cipher` lacks GCM auth_data/auth_tag) and Ed25519 signing (stdlib lacks high-level wrapper). Bindings live in `src/cre/crypto/aead.cr` and `src/cre/audit/signing.cr`.
DATABASE_URL=postgres://cre_test:cre_test@localhost:5432/cre_test \
crystal spec spec/integration # integration with real PG **Testing:** stdlib `Spec` runner, 159+ unit tests + integration tests against real PostgreSQL via Docker.
just ci # format + lint + unit
``` ## Configuration
Setup is fully env-var driven — no config file required. See **[CONFIGURATION.md](CONFIGURATION.md)** for the operator guide:
- Required env vars (`CRE_KEK_HEX`, `CRE_HMAC_KEY_HEX`, `DATABASE_URL`)
- Per-rotator setup (AWS IAM policy, Vault token policy, GitHub admin PAT)
- Telegram bot creation + chat-ID discovery
- systemd service unit with hardening directives
- Production security checklist
## Learn
This project includes step-by-step learning materials covering security theory, architecture, and implementation.
| Module | Topic |
|--------|-------|
| [00 - Overview](learn/00-OVERVIEW.md) | Prerequisites, quick start, three-tier demo path |
| [01 - Concepts](learn/01-CONCEPTS.md) | Rotation theory, real breaches, NIST/SOC2/PCI/ISO/HIPAA framework controls |
| [02 - Architecture](learn/02-ARCHITECTURE.md) | Bus + plugin design, persistence layers, three-layer audit integrity, AEAD envelope |
| [03 - Implementation](learn/03-IMPLEMENTATION.md) | Code-level walkthrough; where to look in source for each concept |
| [04 - Challenges](learn/04-CHALLENGES.md) | 10 ranked extension challenges (PG ALTER USER, Slack, ML-KEM, OpenTimestamps, SPIFFE, JIT broker, etc.) |
## License ## License
MIT - see [LICENSE](LICENSE). AGPL 3.0
## Credits
Built as part of the [Cybersecurity Projects](https://github.com/CarterPerez-dev/Cybersecurity-Projects) portfolio - 60+ enterprise-grade cybersecurity projects designed as senior-level learning resources.