Adam Moussa
ce3833c3a4
The README covered the deployed controls, config inputs, and CI/CD but never explained that the repo is a CDK app or what cdk.json does. Add a CDK app section describing the cdk.json entry point, project layout (bin/app.ts and the lib/ constructs), and the local synth/diff/deploy workflow so contributors can orient without reading the source.
100 lines
4.5 KiB
Markdown
100 lines
4.5 KiB
Markdown
# seahaven-external-dev-baseline
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[](https://github.com/Sea-Haven-Industries/seahaven-external-dev-baseline/actions/workflows/ci.yaml)
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Account-local security baseline (CDK, TypeScript) for **`seahaven-external-dev`**
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(account `396287094661`, us-east-1), the isolated AWS account used by the
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external web-app dev team. A stripped fork of
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[`seahaven-account-baseline`](https://github.com/Sea-Haven-Industries/seahaven-account-baseline).
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The external team works only in this account; they have no access to the
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management/production account `328440206208`. This stack ensures the isolated
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account is not a monitoring blind spot.
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## Architecture
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Single stack `seahaven-external-dev-baseline`:
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| Control | Resource | Notes |
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| AWS Config | recorder + delivery channel + `seahaven-extdev-config-<acct>` bucket | Records all supported resource types; foundation for Security Hub CIS |
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| GuardDuty | detector (15-min findings) | Account-local threat detection |
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| Security Hub | FSBP v1.0.0 + CIS AWS Foundations v3.0.0 | CIS evaluated against Config — no local trail required |
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| IAM Access Analyzer | account-scoped external-access analyzer | |
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| VPC flow logs | `seahaven-extdev-vpc-flow-logs-<acct>` bucket | ALL traffic; VPC ids passed via context |
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| Budget | `seahaven-extdev-monthly-cost`, $200/mo | 80%/100% actual + 100% forecast → `adam@seahaven.com` (Sea Haven ops) |
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## Deliberately excluded
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- **No local CloudTrail.** The management-account organization trail
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`seahaven-org-trail` already captures this account's management + data events
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centrally. A second local trail would duplicate that at extra cost.
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- **No CIS Section-4 metric-filter alarms.** Those bind to a local CloudTrail
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CloudWatch Logs group, which does not exist here. The Security Hub CIS
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standard evaluates the same controls against AWS Config instead.
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- **No WAF, SES monitoring, Bedrock logging, DynamoDB CMK, or AWS Backup** —
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all production-only concerns in the source baseline.
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## CDK app
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This repo is an AWS CDK application (TypeScript). `cdk.json` is the CDK
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entry point: it sets `app` to `npx ts-node bin/app.ts`, so the CLI runs the
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TypeScript source directly with no separate build step, and pins the CDK
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feature flags / context the stack synthesizes against.
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Layout follows the standard CDK project structure:
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| Path | Purpose |
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| `cdk.json` | CDK config — `app` command, `watch` globs, and feature-flag context |
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| `bin/app.ts` | App entry point; instantiates the stack with explicit `stackName`, target account `396287094661`, and `us-east-1`, and reads `flowLogVpcIds` from context |
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| `lib/external-dev-baseline-stack.ts` | The `seahaven-external-dev-baseline` stack; composes the constructs below |
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| `lib/detective-controls.ts` | AWS Config, GuardDuty, Security Hub (FSBP + CIS v3.0), IAM Access Analyzer |
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| `lib/flow-logs.ts` | VPC flow-logs bucket and (when VPC ids are supplied) flow logs |
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| `lib/governance-toggles.ts` | Monthly cost Budget and alert subscriptions |
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Local workflow (from the repo root):
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```bash
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npm ci
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npx cdk synth # synthesize CloudFormation (also `npm run synth`)
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npx cdk diff # diff against the deployed stack (`npm run diff`)
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npx cdk deploy # deploy (`npm run deploy`)
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```
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`cdk.json` is committed; `cdk.out/` (synth output) and compiled `*.js` /
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`*.d.ts` artifacts are git-ignored.
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## Configuration
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| Input | Where | Value |
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|---|---|---|
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| Target account | `bin/app.ts` | `396287094661` |
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| Region | `bin/app.ts` | `us-east-1` (account is SCP region-locked) |
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| Budget | `bin/app.ts` | $200/mo → `adam@seahaven.com` |
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| Flow-log VPC ids | cdk context `flowLogVpcIds` | comma-separated; empty by default |
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```bash
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# Deploy attaching flow logs to specific VPCs:
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npm ci
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npx cdk deploy -c flowLogVpcIds=vpc-aaaa,vpc-bbbb
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```
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## Post-deploy runbook
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**Enable Inspector2** (no CloudFormation enable resource exists):
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```bash
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aws inspector2 enable --resource-types EC2 ECR LAMBDA --account-ids 396287094661
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```
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This is a one-time per-account toggle; it persists across stack deploys.
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## Deployment
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CI/CD via the org reusable workflows (`ci-typescript-cdk.yaml`, `cd-cdk.yaml`,
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node 24). Push to `main` deploys via GitHub OIDC into `396287094661` using the
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`githubdeploy-seahaven-external-dev-baseline` role (repo secret
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`AWS_DEPLOY_ROLE_ARN`).
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