generated from coulomb/repo-seed
tegwick
8e9383a33a
Add policy.py client that calls flex-auth /v1/check before sign/issue when policy.enabled is true. Record policy_decision_id in signatures.log. Default off preserves existing inventory-only behavior. Document production OpenBao health probe and update config/wiki references.
121 lines
3.4 KiB
Markdown
121 lines
3.4 KiB
Markdown
# Policy-Gated SSH Signing
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Date: 2026-06-17
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Status: **implemented (opt-in)** — WARDEN-WP-0007
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By default `warden sign` authorizes via **inventory allow-list** and TTL policy
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only. When `policy.enabled: true` in `warden.yaml`, ops-warden calls flex-auth
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before signing and records the decision id in `signatures.log`.
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---
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## Flow
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```text
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warden sign <actor> --pubkey <path>
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v
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Load actor from inventory (type, principals, ttl)
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v
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policy.enabled?
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no -> skip
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yes -> flex-auth POST /v1/check
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+-- DENY / unreachable (fail_closed) -> CAError
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v ALLOW
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CABackend.sign() (local or OpenBao SSH engine)
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v
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Append signatures.log (+ policy_decision_id when set)
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```
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The same gate runs for `warden issue` (local backend only).
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---
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## flex-auth request shape
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| Field | Source |
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| --- | --- |
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| `subject.id` | `WARDEN_POLICY_SUBJECT` env var, or actor name |
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| `subject.type` | Actor type (`adm` / `agt` / `atm`) |
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| `tenant` | `policy.tenant` (default `tenant:platform`) |
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| `resource.id` | `ssh-cert:actor/<actor-name>` |
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| `resource.type` | `ssh-certificate` |
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| `action` | `sign` |
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| `context.principals` | From inventory |
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| `context.actor_type` | adm \| agt \| atm |
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| `context.pubkey_fingerprint` | SHA256 of pubkey text |
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| `context.ttl_hours` | Requested TTL |
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flex-auth must return `effect: allow` and an `id` (or `request_id`) on allow.
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Deny responses include a `reason` surfaced in the CLI error.
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---
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## Configuration
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```yaml
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# warden.yaml — policy gate (opt-in, default off)
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policy:
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enabled: false
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flex_auth_url: http://127.0.0.1:8080
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fail_closed: true
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tenant: tenant:platform
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subject_env: WARDEN_POLICY_SUBJECT
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system: ops-warden
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```
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| Key | Default | Description |
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| --- | --- | --- |
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| `enabled` | `false` | When `true`, call flex-auth before every sign/issue |
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| `flex_auth_url` | `http://127.0.0.1:8080` | flex-auth base URL |
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| `fail_closed` | `true` | Deny sign when flex-auth is unreachable or returns HTTP error |
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| `tenant` | `tenant:platform` | Tenant sent in subject and resource |
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| `subject_env` | `WARDEN_POLICY_SUBJECT` | Env var for IAM subject id override |
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| `system` | `ops-warden` | Resource system identifier |
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Set `WARDEN_POLICY_SUBJECT` to the caller's IAM profile `sub` when available.
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If unset, the actor name is used as subject id.
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---
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## Versioning
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| Version | Gate | Status |
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| --- | --- | --- |
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| **v1** | Inventory + TTL max | Shipped |
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| **v2** | flex-auth opt-in via `policy.enabled` | Shipped (WP-0007) |
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| **v2.1** | Identity claims required for `adm` signs | Planned |
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| **v3** | Tenant-scoped policies per `tenant:*` | Planned |
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---
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## What stays in inventory
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- Actor registration (name, type, default principals, default TTL)
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- Host reference documentation
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- Scorecard local checks
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flex-auth decides **whether this sign request is allowed now**; inventory
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defines **what the actor is allowed to request**.
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---
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## Production rollout
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1. Deploy flex-auth policies for resource type `ssh-certificate`.
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2. Enable `policy.enabled: true` in production `warden.yaml`.
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3. Keep `fail_closed: true` unless an explicit break-glass procedure exists.
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4. Verify `signatures.log` entries include `policy_decision_id`.
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---
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## See also
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- `wiki/OpsWardenConfig.md` — full config reference
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- `wiki/CredentialRouting.md`
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- `flex-auth/INTENT.md`
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- `net-kingdom/docs/platform-identity-security-architecture.md` |