seahaven-external-dev-baseline/README.md

# seahaven-external-dev-baseline

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![TypeScript](https://img.shields.io/badge/TypeScript-3178C6?logo=typescript&logoColor=white)
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Account-local security baseline (CDK, TypeScript) for **`seahaven-external-dev`**
(account `396287094661`, us-east-1), the isolated AWS account used by the
external web-app dev team. A stripped fork of
[`seahaven-account-baseline`](https://github.com/Sea-Haven-Industries/seahaven-account-baseline).

The external team works only in this account; they have no access to the
management/production account `328440206208`. This stack ensures the isolated
account is not a monitoring blind spot.

## Architecture

Single stack `seahaven-external-dev-baseline`:

| Control | Resource | Notes |
|---|---|---|
| AWS Config | recorder + delivery channel + `seahaven-extdev-config-<acct>` bucket | Records all supported resource types; foundation for Security Hub CIS |
| GuardDuty | detector (15-min findings) | Account-local threat detection |
| Security Hub | FSBP v1.0.0 + CIS AWS Foundations v3.0.0 | CIS evaluated against Config — no local trail required |
| IAM Access Analyzer | account-scoped external-access analyzer | |
| VPC flow logs | `seahaven-extdev-vpc-flow-logs-<acct>` bucket | ALL traffic; VPC ids passed via context |
| Budget | `seahaven-extdev-monthly-cost`, $200/mo | 80%/100% actual + 100% forecast → `adam@seahaven.com` (Sea Haven ops) |

## Deliberately excluded

- **No local CloudTrail.** The management-account organization trail
  `seahaven-org-trail` already captures this account's management + data events
  centrally. A second local trail would duplicate that at extra cost.
- **No CIS Section-4 metric-filter alarms.** Those bind to a local CloudTrail
  CloudWatch Logs group, which does not exist here. The Security Hub CIS
  standard evaluates the same controls against AWS Config instead.
- **No WAF, SES monitoring, Bedrock logging, DynamoDB CMK, or AWS Backup** —
  all production-only concerns in the source baseline.

## CDK app

This repo is an AWS CDK application (TypeScript). `cdk.json` is the CDK
entry point: it sets `app` to `npx ts-node bin/app.ts`, so the CLI runs the
TypeScript source directly with no separate build step, and pins the CDK
feature flags / context the stack synthesizes against.

Layout follows the standard CDK project structure:

| Path | Purpose |
|---|---|
| `cdk.json` | CDK config — `app` command, `watch` globs, and feature-flag context |
| `bin/app.ts` | App entry point; instantiates the stack with explicit `stackName`, target account `396287094661`, and `us-east-1`, and reads `flowLogVpcIds` from context |
| `lib/external-dev-baseline-stack.ts` | The `seahaven-external-dev-baseline` stack; composes the constructs below |
| `lib/detective-controls.ts` | AWS Config, GuardDuty, Security Hub (FSBP + CIS v3.0), IAM Access Analyzer |
| `lib/flow-logs.ts` | VPC flow-logs bucket and (when VPC ids are supplied) flow logs |
| `lib/governance-toggles.ts` | Monthly cost Budget and alert subscriptions |

Local workflow (from the repo root):

```bash
npm ci
npx cdk synth   # synthesize CloudFormation (also `npm run synth`)
npx cdk diff    # diff against the deployed stack (`npm run diff`)
npx cdk deploy  # deploy (`npm run deploy`)
```

`cdk.json` is committed; `cdk.out/` (synth output) and compiled `*.js` /
`*.d.ts` artifacts are git-ignored.

## Configuration

| Input | Where | Value |
|---|---|---|
| Target account | `bin/app.ts` | `396287094661` |
| Region | `bin/app.ts` | `us-east-1` (account is SCP region-locked) |
| Budget | `bin/app.ts` | $200/mo → `adam@seahaven.com` |
| Flow-log VPC ids | cdk context `flowLogVpcIds` | comma-separated; empty by default |

```bash
# Deploy attaching flow logs to specific VPCs:
npm ci
npx cdk deploy -c flowLogVpcIds=vpc-aaaa,vpc-bbbb
```

## Post-deploy runbook

**Enable Inspector2** (no CloudFormation enable resource exists):

```bash
aws inspector2 enable --resource-types EC2 ECR LAMBDA --account-ids 396287094661
```

This is a one-time per-account toggle; it persists across stack deploys.

## Deployment

CI/CD via the org reusable workflows (`ci-typescript-cdk.yaml`, `cd-cdk.yaml`,
node 24). Push to `main` deploys via GitHub OIDC into `396287094661` using the
`githubdeploy-seahaven-external-dev-baseline` role (repo secret
`AWS_DEPLOY_ROLE_ARN`).