# Sprint 10 — C2 TLS verify: redteam-friendly defaults + warning suppression

**Base**: `origin/main` (PR #11 merged — sprint 8 + 9 are in).
**Branch**: `sprint/10-c2-tls-default`.
**Scope**: tiny correctness sprint. No new feature. Flip a security-relevant default to match the actual operator usage of this tool.

---

## Symptom (user report)

> "Impossible de se connecter à mon C2 à cause de la vérification du certificat SSL (self signed)"

Operator opens C2 config card, fills URL + token, hits **Test connection** without noticing the checkbox → SSL VERIFY FAILED against self-signed Mythic.

## Root cause (workflow diagnosis confirmed)

The `verify_tls` chain is **fully intact** end-to-end :
React `verifyTls` state → `C2ConfigInput.verify_tls` → PUT body → `C2Config.verify_tls` column → `cfg.verify_tls` in API loader → `get_adapter(verify_tls=)` → `MythicAdapter._verify` → `requests.post(verify=self._verify)`.

The bug is the **default** at every layer is `True` :
- `backend/app/models/c2_config.py:22` — `default=True`
- `backend/migrations/versions/0006_c2_layer.py:29` — `server_default=sa.true()`
- `backend/app/api/c2.py:87` — `data.get("verify_tls", True)`
- `backend/app/services/c2/mythic.py:116` — `verify_tls: bool = True`
- `backend/app/services/c2/factory.py:9` — `verify_tls=True`
- `frontend/src/components/C2ConfigCard.tsx:27` — `useState(true)`
- `frontend/src/components/C2ConfigCard.tsx:74` — reset on delete `setVerifyTls(true)`

Mimic is a BAS / red-team lab tool ; the dominant case is a **self-signed Mythic instance**, not a publicly-trusted cert chain. Defaulting `verify=True` is hostile to the actual workflow.

Secondary defect : `urllib3.exceptions.InsecureRequestWarning` is never suppressed (zero hits for `disable_warnings` / `urllib3` in `backend/`). When operators correctly uncheck verify, stderr gets spammed once per HTTP call.

---

## Decisions (locked)

1. **Flip default to `False` at every layer** — model, API fallback, adapter, factory, React state, delete reset.
2. **New migration 0008** : flip `server_default` to `sa.false()`. Existing rows are NOT mutated (their stored boolean is preserved).
3. **Suppress `urllib3.InsecureRequestWarning` ONLY when `verify_tls=False`** — gated inside `MythicAdapter.__init__`. Keeps the warning live for any future code that legitimately verifies.
4. **Add helper text under checkbox** : "Leave unchecked for lab Mythic with self-signed certificates." Operators see why the box matters.
5. **No API contract change** — `C2ConfigInput.verify_tls: boolean` stays required. The fallback in `data.get("verify_tls", False)` only matters for hand-crafted requests.

## Out of scope

- Don't touch existing C2 endpoints behavior (route paths, payload shapes).
- Don't change the `verify_tls` field type or remove the column.
- Don't change the FakeAdapter (it makes no HTTP calls).

---

## Task A — Backend (backend-builder)

**Files** :
- `backend/app/models/c2_config.py` — line 22 : `default=True` → `default=False`
- `backend/app/api/c2.py` — line 87 : `data.get("verify_tls", True)` → `data.get("verify_tls", False)`
- `backend/app/services/c2/factory.py` — line 9 : `verify_tls: bool = True` → `verify_tls: bool = False`
- `backend/app/services/c2/mythic.py` — line 116 : `verify_tls: bool = True` → `verify_tls: bool = False`, AND add at top of file `import urllib3` + `from urllib3.exceptions import InsecureRequestWarning`, AND inside `__init__` after `self._verify = verify_tls`:
  ```python
  if not verify_tls:
      urllib3.disable_warnings(InsecureRequestWarning)
  ```
- **NEW migration** `backend/migrations/versions/0008_c2_verify_tls_default_false.py` — flip `server_default` to `sa.false()`. Use `op.batch_alter_table("c2_config")` for SQLite compatibility (Mimic uses SQLite per sprint 1 SPEC). Down-migration restores `sa.true()`.
- **Tests** : grep `backend/tests/` for `verify_tls` and flip every assertion that presupposed the old `True` default (likely in `test_c2_config*.py` PUT-without-verify-tls tests and GET-fresh-row tests). Don't add new tests — adapt existing ones.

**Constraints** :
- `pytest` baseline 468/468 must hold (or grow ; never shrink).
- `ruff` + `mypy --strict` clean.
- Migration 0008 must be reversible — round-trip `alembic upgrade head` then `alembic downgrade -1` then `alembic upgrade head` must work on a fresh SQLite DB.
- Don't restructure or refactor anything else. Minimum surface.

## Task B — Frontend (frontend-builder)

**Files** :
- `frontend/src/components/C2ConfigCard.tsx` :
  - Line 27 : `useState(true)` → `useState(false)`
  - Line 74 (delete handler) : `setVerifyTls(true)` → `setVerifyTls(false)`
  - Under the checkbox JSX (around lines 169-182) : add a `<p>` with helper text :
    ```tsx
    <p className="text-[12px] text-charcoal mt-xxs">
      Leave unchecked for lab Mythic with self-signed certificates.
    </p>
    ```
    (Use the existing DESIGN.md tokens — `text-[12px] text-charcoal` matches the `hint` style on `FormField`. Confirm token name by reading neighboring components first.)
- **Vitest** : if `C2ConfigCard.test.tsx` exists, flip any "starts checked" assertion to "starts unchecked".

**Constraints** :
- `vitest` baseline 212/212 must hold.
- `tsc --noEmit` + `eslint --max-warnings=0` clean.
- No type change to `C2ConfigInput` (the field is already required `boolean`).
- Visual: same row, just one extra `<p>` hint below the checkbox-label row. Same brutalist treatment, no transition.

## Task C — Sequencing

Both tasks have **zero shared files**. Dispatch backend-builder + frontend-builder **in parallel**. No ordering constraint.

After both report green :
- **code-reviewer** : sprint diff scan (focus : migration reversibility, urllib3 gating, no leftover hardcoded `True`).
- **design-reviewer** : helper-text placement, token compliance, focus ring still works, no regression on the card.
- **spec-reviewer** : verify SPEC.md § Intégration C2 still matches the new defaults (may need a one-line note about lab-mode default ; check before editing).

## Definition of Done

- Test connection against self-signed Mythic from a freshly-created C2 config works **without unchecking anything**.
- Existing rows are untouched (operators who saved verify_tls=true keep it until they re-save).
- `pytest` 468/468 → 468+ (no shrink), `vitest` 212/212.
- `ruff` + `mypy --strict` + `tsc --noEmit` + `eslint` clean.
- Migration 0008 round-trip OK.
- No `urllib3.InsecureRequestWarning` on stderr when `verify_tls=False`.
- Code-reviewer + design-reviewer + spec-reviewer APPROVED.
- PR opened on Gitea ; tasks/pr-body-sprint-10.md drafted by team-lead.

## Operator notes (for PR body)

- This sprint flips a security-relevant default. Production operators who legitimately use a publicly-trusted cert chain will need to explicitly check the box — but the dominant case in this BAS tool is lab Mythic with self-signed, so the new default matches the actual workflow.
- Existing engagements with `verify_tls=true` already stored remain unchanged. They keep their current behaviour. If the operator reported the bug because their existing row has `verify_tls=true`, they will still need to uncheck + save once after this sprint lands.