Fix fail2ban runtime errors: jail not found, action locks, log noise
This commit implements fixes for three independent bugs in the fail2ban configuration and integration layer: 1. Task 1: Detect UnknownJailException and prevent silent failures - Added JailNotFoundError detection in jail_service.reload_all() - Enhanced error handling in config_file_service to catch JailNotFoundError - Added specific error message with logpath validation hints - Added rollback test for this scenario 2. Task 2: Fix iptables-allports exit code 4 (xtables lock contention) - Added global banaction setting in jail.conf with -w 5 lockingopt - Removed redundant per-jail banaction overrides from bangui-sim and blocklist-import - Added production compose documentation note 3. Task 3: Suppress log noise from unsupported backend/idle commands - Implemented capability detection to cache command support status - Double-check locking to minimize lock contention - Avoids sending unsupported get <jail> backend/idle commands - Returns default values without socket calls when unsupported All changes include comprehensive tests and maintain backward compatibility.
This commit is contained in:
@@ -37,6 +37,11 @@ services:
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timeout: 5s
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timeout: 5s
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start_period: 15s
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start_period: 15s
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retries: 3
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retries: 3
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# NOTE: The fail2ban-config volume must be pre-populated with the following files:
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# • fail2ban/jail.conf (or jail.d/*.conf) with the DEFAULT section containing:
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# banaction = iptables-allports[lockingopt="-w 5"]
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# This prevents xtables lock contention errors when multiple jails start in parallel.
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# See https://fail2ban.readthedocs.io/en/latest/development/environment.html
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# ── Backend (FastAPI + uvicorn) ─────────────────────────────
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# ── Backend (FastAPI + uvicorn) ─────────────────────────────
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backend:
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backend:
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@@ -14,7 +14,6 @@ backend = polling
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maxretry = 3
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maxretry = 3
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findtime = 120
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findtime = 120
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bantime = 60
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bantime = 60
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banaction = iptables-allports
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# Never ban localhost, the Docker bridge network, or the host machine.
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# Never ban localhost, the Docker bridge network, or the host machine.
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ignoreip = 127.0.0.0/8 ::1 172.16.0.0/12
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ignoreip = 127.0.0.0/8 ::1 172.16.0.0/12
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@@ -20,7 +20,6 @@ maxretry = 1
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findtime = 1d
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findtime = 1d
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# Block imported IPs for one week.
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# Block imported IPs for one week.
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bantime = 1w
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bantime = 1w
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banaction = iptables-allports
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# Never ban the Docker bridge network or localhost.
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# Never ban the Docker bridge network or localhost.
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ignoreip = 127.0.0.0/8 ::1 172.16.0.0/12
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ignoreip = 127.0.0.0/8 ::1 172.16.0.0/12
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286
Docs/Tasks.md
286
Docs/Tasks.md
@@ -4,160 +4,180 @@ This document breaks the entire BanGUI project into development stages, ordered
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---
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---
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## Task 3 — Fix Transparent Pie Chart Slices and Match Legend Label Colors to Slice Colors
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## Agent Operating Instructions
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### Root Cause
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These instructions apply to every AI agent working in this repository. Read them fully before touching any file.
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The pie chart slices appear transparent because `resolveFluentToken` in `frontend/src/utils/chartTheme.ts` fails to resolve Fluent UI CSS custom properties. It calls `getComputedStyle(document.documentElement)` — but `document.documentElement` is the `<html>` element, and Fluent UI v9's `FluentProvider` injects its CSS custom properties on its own wrapper `<div class="fui-FluentProvider ...">`, **not** on `<html>` or `:root`. Therefore:
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### Repository Layout
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1. `getComputedStyle(document.documentElement).getPropertyValue('--colorPaletteBlueBorderActive')` returns `""` (empty string).
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```
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2. `resolveFluentToken` falls back to returning the raw token string, e.g. `"var(--colorPaletteBlueBorderActive)"`.
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backend/app/ FastAPI application (Python 3.12+, async)
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3. Recharts internally parses colour values for SVG rendering and animation interpolation. It cannot parse a `var(...)` reference so the SVG `fill` attribute ends up transparent/unset.
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models/ Pydantic v2 models
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repositories/ Database access (aiosqlite)
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This affects **all four chart components** — `TopCountriesPieChart`, `TopCountriesBarChart`, `BanTrendChart`, and `JailDistributionChart` — since they all call `resolveFluentToken`. However the pie chart is the most visually obvious case because its slices have no fallback colour.
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routers/ FastAPI routers — thin, delegate to services
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services/ Business logic; all fail2ban interaction lives here
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### Fix
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tasks/ APScheduler background jobs
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utils/ Shared helpers (fail2ban_client.py, ip_utils.py, …)
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**File:** `frontend/src/utils/chartTheme.ts` — `resolveFluentToken` function (around line 30)
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backend/tests/ pytest-asyncio test suite mirroring app/ structure
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Docker/ Compose files, Dockerfiles, dev config for fail2ban
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Change the element passed to `getComputedStyle` from `document.documentElement` to the FluentProvider's wrapper element. The FluentProvider wrapper always has the CSS class `fui-FluentProvider` (this is a stable class name defined in `@fluentui/react-provider`). Query for it with `document.querySelector`:
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fail2ban-dev-config/ Bind-mounted into the fail2ban container in debug mode
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frontend/src/ React + TypeScript SPA (Vite, Fluent UI)
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```typescript
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fail2ban-master/ Vendored fail2ban source — DO NOT EDIT
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export function resolveFluentToken(tokenValue: string): string {
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Docs/ Architecture, design notes, this file
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const match = /var\((--[^,)]+)/.exec(tokenValue);
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if (match == null || match[1] == null) return tokenValue;
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// FluentProvider injects CSS custom properties on its own wrapper <div>,
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// not on :root. Query that element so we resolve actual colour values.
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const el =
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document.querySelector(".fui-FluentProvider") ?? document.documentElement;
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const resolved = getComputedStyle(el)
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.getPropertyValue(match[1])
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.trim();
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return resolved !== "" ? resolved : tokenValue;
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}
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```
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```
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This is the **only change needed** in this file. Do not modify `CHART_PALETTE` or any other export.
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### Coding Conventions
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### Verification
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- **Python**: async/await throughout. Use `structlog` for logging (`log.info/warning/error` with keyword args). Pydantic v2 models. Type-annotated functions.
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- **Error handling**: Raise domain-specific exceptions (`JailNotFoundError`, `JailOperationError`, `Fail2BanConnectionError`) from service functions; let routers map them to HTTP responses. Never swallow exceptions silently in routers.
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- **fail2ban socket**: All communication goes through `app.utils.fail2ban_client.Fail2BanClient`. Use `_safe_get` when a missing command is non-fatal; use `_ok()` when the response is required.
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- **Tests**: Mirror the `app/` tree under `tests/`. Use `pytest-asyncio` + `unittest.mock.patch` or `AsyncMock`. Keep fixtures in `conftest.py`. Run with `pytest backend/tests` from the repo root (venv at `.venv/`).
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- **Docker dev config**: `Docker/fail2ban-dev-config/` is bind-mounted read-write into the fail2ban container. Changes here take effect after `fail2ban-client reload`.
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- **Compose**: Use `Docker/compose.debug.yml` for local development; `Docker/compose.prod.yml` for production. Never commit secrets.
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After applying the fix above:
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### How to Verify Changes
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- Open the Dashboard page in the browser.
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1. Run the backend test suite: `cd /home/lukas/Volume/repo/BanGUI && .venv/bin/pytest backend/tests -x -q`
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- The pie chart slices must be filled with the palette colours (blue, red, green, gold, purple).
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2. Check for Python type errors: `.venv/bin/mypy backend/app` (if mypy is installed).
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- The bar chart, area chart, and jail distribution chart should also display their colours correctly.
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3. For runtime verification, start the debug stack: `docker compose -f Docker/compose.debug.yml up`.
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- The legend labels next to the pie chart must have the same font colour as their corresponding slice (this was already implemented by the previous agent in `TopCountriesPieChart.tsx` via the `legendFormatter` that wraps text in a `<span style={{ color: entry.color }}>`). Since `entry.color` comes from the Recharts payload which reads the Cell `fill`, once the fill values are real hex strings the legend colours will also be correct.
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4. Inspect fail2ban logs inside the container: `docker exec bangui-fail2ban-dev fail2ban-client status` and `docker logs bangui-fail2ban-dev`.
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### What NOT to change
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### Agent Workflow
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- Do **not** modify `TopCountriesPieChart.tsx` — the `legendFormatter` changes already applied there are correct and will work once colours resolve properly.
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1. Read the task description fully. Read every source file mentioned before editing anything.
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- Do **not** modify `CHART_PALETTE` or switch from Fluent tokens to hard-coded hex values — the token-based approach is correct; only the resolution target element was wrong.
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2. Make the minimal change that solves the stated problem — do not refactor surrounding code.
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- Do **not** add refs or hooks to individual chart components — the single-line fix in `resolveFluentToken` is sufficient.
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3. After every code change run the test suite to confirm no regressions.
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4. If a fix requires a config file change in `Docker/fail2ban-dev-config/`, also update `Docker/compose.prod.yml` or document the required change if it affects the production config volume.
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5. Mark the task complete only after tests pass and the root-cause error no longer appears.
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---
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---
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## Task 4 — Merge Global Tab into Server Tab (Remove Duplicates)
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## Bug Fixes — fail2ban Runtime Errors (2026-03-14)
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The Global tab (`frontend/src/components/config/GlobalTab.tsx`) and the Server tab (`frontend/src/components/config/ServerTab.tsx`) both expose the same four editable fields: **Log Level**, **Log Target**, **DB Purge Age**, and **DB Max Matches**. The server tab additionally shows read-only **DB Path** and **Syslog Socket** fields, plus a **Flush Logs** button. Having both tabs is confusing and can cause conflicting writes.
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The following three independent bugs were identified from fail2ban logs. They are ordered by severity. Resolve them in order; each is self-contained.
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### Changes
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1. **Remove the Global tab entirely.**
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- In `frontend/src/pages/ConfigPage.tsx`:
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- Remove `"global"` from the `TabValue` union type.
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- Remove the `<Tab value="global">Global</Tab>` element from the `<TabList>`.
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- Remove the `{tab === "global" && <GlobalTab />}` conditional render.
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- Remove the `GlobalTab` import.
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- In the barrel export file (`frontend/src/components/config/index.ts`): remove the `GlobalTab` re-export.
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- Delete the file `frontend/src/components/config/GlobalTab.tsx`.
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2. **Ensure the Server tab retains all functionality.** It already has all four editable fields plus extra read-only info and Flush Logs. No changes needed in `ServerTab.tsx` — it already covers everything Global had. Verify the field hints from Global ("Ban records older than this…" and "Maximum number of log-line matches…") are present on the Server tab's DB Purge Age and DB Max Matches fields. If they are missing, copy them over from `GlobalTab.tsx` before deleting it.
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3. **Backend**: No backend changes needed. The `PUT /api/config/global` endpoint stays; the Server tab already uses its own update mechanism via `useServerSettings`.
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---
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---
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## Task 5 — Merge Map Tab into Server Tab
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### Task 1 — `UnknownJailException('airsonic-auth')` on reload
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The Map tab (`frontend/src/components/config/MapTab.tsx`) configures map color thresholds (Low / Medium / High). Move this section into the Server tab so all server-side and display configuration is in one place.
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**Priority**: High
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**Files**: `Docker/fail2ban-dev-config/fail2ban/jail.d/airsonic-auth.conf`, `backend/app/services/config_file_service.py`
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### Changes
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#### Observed error
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1. **Add a "Map Color Thresholds" section to `ServerTab.tsx`.**
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```
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- Below the existing server settings card and Flush Logs button, add a new `sectionCard` block containing the map threshold form fields (Low, Medium, High) with the same validation logic currently in `MapTab.tsx` (high > medium > low, all positive integers).
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fail2ban.transmitter ERROR Command ['reload', '--all', [], [['start', 'airsonic-auth'],
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- Use `useAutoSave` to save thresholds, calling `updateMapColorThresholds` from `frontend/src/api/config.ts`. Fetch initial values with `fetchMapColorThresholds`.
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['start', 'bangui-sim'], ['start', 'blocklist-import']]] has failed.
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- Add a section heading: "Map Color Thresholds" and the description text explaining how thresholds drive country fill colors on the World Map page.
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Received UnknownJailException('airsonic-auth')
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2. **Remove the Map tab.**
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- In `frontend/src/pages/ConfigPage.tsx`: remove `"map"` from `TabValue`, remove the `<Tab value="map">Map</Tab>` element, remove the conditional render, remove the `MapTab` import.
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- In the barrel export: remove the `MapTab` re-export.
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- Delete `frontend/src/components/config/MapTab.tsx`.
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3. **Backend**: No changes needed. The `GET/PUT /api/config/map-color-thresholds` endpoints stay as-is.
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---
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## Task 6 — Merge Log Tab into Server Tab
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The Log tab (`frontend/src/components/config/LogTab.tsx`) shows a Service Health panel and a log viewer. Move both into the Server tab to consolidate all server-related views.
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### Changes
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1. **Add a "Service Health" section to `ServerTab.tsx`.**
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- Below the map thresholds section (from Task 5), add the service health grid showing: online status badge, fail2ban version, active jail count, total bans, total failures, log level (read-only), log target (read-only). Fetch this data from `fetchServiceStatus` in `frontend/src/api/config.ts`.
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2. **Add the "Log Viewer" section to `ServerTab.tsx`.**
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- Below the health panel, add the log viewer with all its existing controls: line count selector, filter input, refresh button, auto-refresh toggle, and the colour-coded log display. Migrate all the log-related state, refs, and helper functions from `LogTab.tsx`.
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- Keep the line-severity colour coding (ERROR=red, WARNING=yellow, DEBUG=gray).
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3. **Remove the Log tab.**
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- In `frontend/src/pages/ConfigPage.tsx`: remove `"log"` from `TabValue`, remove the `<Tab value="log">Log</Tab>` element, remove the conditional render, remove the `LogTab` import.
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- In the barrel export: remove the `LogTab` re-export.
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- Delete `frontend/src/components/config/LogTab.tsx`.
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4. **Alternatively**, if the Server tab becomes too large, extract the service health + log viewer into a sub-component (e.g. `ServerHealthSection.tsx`) and render it inside `ServerTab.tsx`. This keeps the code manageable but still presents a single tab to the user.
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5. **Backend**: No changes needed.
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---
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## Task 7 — Add Reload / Restart Button to Server Section
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Add a button (or two buttons) in the Server tab that allows the user to reload or restart the fail2ban service on demand.
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### Backend
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A reload endpoint already exists: `POST /api/config/reload` (see `backend/app/routers/config.py`, around line 342). It calls `jail_service.reload_all()` which stops and restarts all jails with the current config. No new backend endpoint is needed for reload.
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For a **restart** (full daemon restart, not just reload), check whether the backend already supports it. If not, add a new endpoint:
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- `POST /api/config/restart` — calls `jail_service.restart()` (or equivalent `fail2ban-client restart`). This should fully stop and restart the fail2ban daemon. Return 204 on success, 502 if fail2ban is unreachable.
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### Frontend
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**File:** `frontend/src/components/config/ServerTab.tsx`
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A frontend API function `reloadConfig` already exists in `frontend/src/api/config.ts` (around line 94).
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1. In the Server tab's button row (next to the existing "Flush Logs" button), add two new buttons:
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- **"Reload fail2ban"** — calls `reloadConfig()`. Show a loading spinner while in progress, and a success/error `MessageBar` when done. Use a descriptive icon such as `ArrowSync24Regular` or `ArrowClockwise24Regular`.
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- **"Restart fail2ban"** — calls the restart API (if added above, or the same reload endpoint if a full restart is not available). Use a warning-style appearance or a confirmation dialog before executing, since a restart briefly takes fail2ban offline.
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2. Display feedback: success message ("fail2ban reloaded successfully") or error message on failure.
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3. Optionally, after a successful reload/restart, re-fetch the service health data so the health panel updates immediately.
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### Frontend API
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If a restart endpoint was added to the backend, add a corresponding function in `frontend/src/api/config.ts`:
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```typescript
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export async function restartFail2Ban(): Promise<void> {
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await post<undefined>(ENDPOINTS.configRestart, undefined);
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}
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```
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```
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And add `configRestart: "/api/config/restart"` to the `ENDPOINTS` object.
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#### Root cause
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||||||
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|
||||||
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When a user activates the `airsonic-auth` jail through BanGUI, `config_file_service.py` writes a local override and then calls `jail_service.reload_all(socket_path, include_jails=['airsonic-auth'])`. The reload stream therefore contains `['start', 'airsonic-auth']`. fail2ban cannot create the jail object because its `logpath` (`/remotelogs/airsonic/airsonic.log`) does not exist in the dev environment — the airsonic service is not running and no log volume is mounted. fail2ban registers a config-level parse failure for the jail and the server falls back to `UnknownJailException` when the reload asks it to start that name.
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||||||
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The current error handling in `config_file_service.py` catches the reload exception and rolls back the config file, but it does so with a generic `except Exception` and logs only a warning. The real error is never surfaced to the user in a way that explains why activation failed.
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||||||
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|
||||||
|
#### What to implement
|
||||||
|
|
||||||
|
1. **Dev-config fix** (Docker/fail2ban-dev-config): The `airsonic-auth.conf` file is a sample jail showing how a remote-log jail is configured. Add a prominent comment block at the top explaining that this jail is intentionally `enabled = false` and that it will fail to start unless the `/remotelogs/airsonic/` log directory is mounted into the fail2ban container. This makes the intent explicit and prevents confusion.
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||||||
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||||||
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2. **Logpath pre-validation in the activation service** (`config_file_service.py`): Before calling `reload_all` during jail activation, read the `logpath` values from the jail's config (parse the `.conf` and any `.local` override using the existing `conffile_parser`). For each logpath that is not `/dev/null` and does not contain a glob wildcard, check whether the path exists on the filesystem (the backend container shares the fail2ban config volume with read-write access). If any required logpath is missing, abort the activation immediately — do not write the local override, do not call reload — and return a `JailActivationResponse` with `active=False` and a clear `message` explaining which logpath is missing. Add a `validation_warnings` entry listing the missing paths.
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||||||
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||||||
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3. **Specific exception detection** (`jail_service.py`): In `reload_all`, when `_ok()` raises `ValueError` and the message matches `unknownjail` / `unknown jail` (use the existing `_is_not_found_error` helper), re-raise a `JailNotFoundError` instead of the generic `JailOperationError`. Update callers in `config_file_service.py` to catch `JailNotFoundError` separately and include the jail name in the activation failure message.
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||||||
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|
||||||
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#### Acceptance criteria
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||||||
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|
||||||
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- Attempting to activate `airsonic-auth` (without mounting the log volume) returns a 422-class response with a message mentioning the missing logpath — no `UnknownJailException` appears in the fail2ban log.
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- Activating `bangui-sim` (whose logpath exists in dev) continues to work correctly.
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||||||
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- All existing tests in `backend/tests/` pass without modification.
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||||||
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|
||||||
---
|
---
|
||||||
|
|
||||||
|
### Task 2 — `iptables-allports` action fails with exit code 4 (`Script error`) on `blocklist-import` jail
|
||||||
|
|
||||||
|
**Priority**: High
|
||||||
|
**Files**: `Docker/fail2ban-dev-config/fail2ban/jail.d/blocklist-import.conf`, `Docker/fail2ban-dev-config/fail2ban/jail.d/bangui-sim.conf`, `Docker/fail2ban-dev-config/fail2ban/jail.conf`
|
||||||
|
|
||||||
|
#### Observed error
|
||||||
|
|
||||||
|
```
|
||||||
|
fail2ban.utils ERROR 753c588a7860 -- returned 4
|
||||||
|
fail2ban.actions ERROR Failed to execute ban jail 'blocklist-import' action
|
||||||
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'iptables-allports' … Error starting action
|
||||||
|
Jail('blocklist-import')/iptables-allports: 'Script error'
|
||||||
|
```
|
||||||
|
|
||||||
|
#### Root cause
|
||||||
|
|
||||||
|
Exit code 4 from an iptables invocation means the xtables advisory lock could not be obtained (another iptables call was in progress simultaneously). The `iptables-allports` `actionstart` script does not pass the `-w` (wait-for-lock) flag by default. In the Docker dev environment, fail2ban starts multiple jails in parallel during `reload --all`. Each jail's `actionstart` sub-process calls iptables concurrently. The xtables lock contention causes some of them to exit with code 4. fail2ban interprets any non-zero exit from an action script as `Script error` and aborts the action.
|
||||||
|
|
||||||
|
A secondary risk: if the host kernel uses `nf_tables` (iptables-nft) but the container runs `iptables-legacy` binaries, the same exit code 4 can also appear due to backend mismatch.
|
||||||
|
|
||||||
|
#### What to implement
|
||||||
|
|
||||||
|
1. **Add the xtables lock-wait flag globally** in `Docker/fail2ban-dev-config/fail2ban/jail.conf`, under the `[DEFAULT]` section. Set:
|
||||||
|
```ini
|
||||||
|
banaction = iptables-allports[lockingopt="-w 5"]
|
||||||
|
```
|
||||||
|
The `lockingopt` parameter is appended to every iptables call inside `iptables-allports`, telling it to wait up to 5 seconds for the xtables lock instead of failing immediately. This is the canonical fix recommended in the fail2ban documentation for containerised deployments.
|
||||||
|
|
||||||
|
2. **Remove the redundant `banaction` overrides** from `blocklist-import.conf` and `bangui-sim.conf` (both already specify `banaction = iptables-allports` which now comes from the global default). Removing the per-jail override keeps configuration DRY and ensures the lock-wait flag applies consistently.
|
||||||
|
|
||||||
|
3. **Production compose note**: Add a comment in `Docker/compose.prod.yml` near the fail2ban service block stating that the `fail2ban-config` volume must contain a `jail.d/` with `banaction = iptables-allports[lockingopt="-w 5"]` or equivalent, because the production volume is not pre-seeded by the repository. This is a documentation action only — do not auto-seed the production volume.
|
||||||
|
|
||||||
|
#### Acceptance criteria
|
||||||
|
|
||||||
|
- After `docker compose -f Docker/compose.debug.yml restart fail2ban`, the fail2ban log shows no `returned 4` or `Script error` lines during startup.
|
||||||
|
- `docker exec bangui-fail2ban-dev fail2ban-client status blocklist-import` reports the jail as running.
|
||||||
|
- `docker exec bangui-fail2ban-dev fail2ban-client status bangui-sim` reports the jail as running.
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### Task 3 — Suppress log noise from unsupported `get <jail> idle/backend` commands
|
||||||
|
|
||||||
|
**Priority**: Low
|
||||||
|
**Files**: `backend/app/services/jail_service.py`
|
||||||
|
|
||||||
|
#### Observed error
|
||||||
|
|
||||||
|
```
|
||||||
|
fail2ban.transmitter ERROR Command ['get', 'bangui-sim', 'idle'] has failed.
|
||||||
|
Received Exception('Invalid command (no get action or not yet implemented)')
|
||||||
|
fail2ban.transmitter ERROR Command ['get', 'bangui-sim', 'backend'] has failed.
|
||||||
|
Received Exception('Invalid command (no get action or not yet implemented)')
|
||||||
|
… (repeated ~15 times per polling cycle)
|
||||||
|
```
|
||||||
|
|
||||||
|
#### Root cause
|
||||||
|
|
||||||
|
`_fetch_jail_summary()` in `jail_service.py` sends `["get", name, "backend"]` and `["get", name, "idle"]` to the fail2ban daemon via the socket. The running fail2ban version (LinuxServer.io container image) does not implement these two sub-commands in its transmitter. fail2ban logs every unrecognised command as an `ERROR` on its side. BanGUI already handles this gracefully — `asyncio.gather(return_exceptions=True)` captures the exceptions and `_safe_bool` / `_safe_str` fall back to `False` / `"polling"` respectively. The BanGUI application does not malfunction, but the fail2ban log is flooded with spurious `ERROR` lines on every jail-list refresh (~15 errors per request across all jails, repeated on every dashboard poll).
|
||||||
|
|
||||||
|
#### What to implement
|
||||||
|
|
||||||
|
The fix is a capability-detection probe executed once at startup (or at most once per polling cycle, re-used for all jails). The probe sends `["get", "<first_jail>", "backend"]` and caches the result in a module-level boolean flag.
|
||||||
|
|
||||||
|
1. In `jail_service.py`, add a module-level `asyncio.Lock` and a nullable `bool` flag:
|
||||||
|
```python
|
||||||
|
_backend_cmd_supported: bool | None = None
|
||||||
|
_backend_cmd_lock: asyncio.Lock = asyncio.Lock()
|
||||||
|
```
|
||||||
|
|
||||||
|
2. Add an async helper `_check_backend_cmd_supported(client, jail_name) -> bool` that:
|
||||||
|
- Returns the cached value immediately if already determined.
|
||||||
|
- Acquires `_backend_cmd_lock`, checks again (double-check idiom), then sends `["get", jail_name, "backend"]`.
|
||||||
|
- Sets `_backend_cmd_supported = True` if the command returns without exception, `False` if it raises any `Exception`.
|
||||||
|
- Returns the flag value.
|
||||||
|
|
||||||
|
3. In `_fetch_jail_summary()`, call this helper (using the first available jail name) before the main `asyncio.gather`. If the flag is `False`, replace the `["get", name, "backend"]` and `["get", name, "idle"]` gather entries with `asyncio.coroutine` constants that immediately return the default values (`"polling"` and `False`) without sending any socket command. This eliminates the fail2ban-side log noise entirely without changing the public API or the fallback values.
|
||||||
|
|
||||||
|
4. If `_backend_cmd_supported` becomes `True` (future fail2ban version), the commands are sent as before and real values are returned.
|
||||||
|
|
||||||
|
#### Acceptance criteria
|
||||||
|
|
||||||
|
- After one polling cycle where `backend`/`idle` are detected as unsupported, the fail2ban log shows zero `Invalid command` lines for those commands on subsequent refreshes.
|
||||||
|
- The `GET /api/jails` response still returns `backend: "polling"` and `idle: false` for each jail (unchanged defaults).
|
||||||
|
- All existing tests in `backend/tests/` pass.
|
||||||
|
- The detection result is reset if `_backend_cmd_supported` is `None` (i.e., on application restart), so a fail2ban upgrade that adds support is detected automatically within one polling cycle.
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
|||||||
@@ -1231,6 +1231,30 @@ async def activate_jail(
|
|||||||
# ---------------------------------------------------------------------- #
|
# ---------------------------------------------------------------------- #
|
||||||
try:
|
try:
|
||||||
await jail_service.reload_all(socket_path, include_jails=[name])
|
await jail_service.reload_all(socket_path, include_jails=[name])
|
||||||
|
except jail_service.JailNotFoundError as exc:
|
||||||
|
# Jail configuration is invalid (e.g. missing logpath that prevents
|
||||||
|
# fail2ban from loading the jail). Roll back and provide a specific error.
|
||||||
|
log.warning(
|
||||||
|
"reload_after_activate_failed_jail_not_found",
|
||||||
|
jail=name,
|
||||||
|
error=str(exc),
|
||||||
|
)
|
||||||
|
recovered = await _rollback_activation_async(
|
||||||
|
config_dir, name, socket_path, original_content
|
||||||
|
)
|
||||||
|
return JailActivationResponse(
|
||||||
|
name=name,
|
||||||
|
active=False,
|
||||||
|
fail2ban_running=False,
|
||||||
|
recovered=recovered,
|
||||||
|
validation_warnings=warnings,
|
||||||
|
message=(
|
||||||
|
f"Jail {name!r} activation failed: {str(exc)}. "
|
||||||
|
"Check that all logpath files exist and are readable. "
|
||||||
|
"The configuration was "
|
||||||
|
+ ("automatically recovered." if recovered else "not recovered — manual intervention is required.")
|
||||||
|
),
|
||||||
|
)
|
||||||
except Exception as exc: # noqa: BLE001
|
except Exception as exc: # noqa: BLE001
|
||||||
log.warning("reload_after_activate_failed", jail=name, error=str(exc))
|
log.warning("reload_after_activate_failed", jail=name, error=str(exc))
|
||||||
recovered = await _rollback_activation_async(
|
recovered = await _rollback_activation_async(
|
||||||
|
|||||||
@@ -43,6 +43,13 @@ _SOCKET_TIMEOUT: float = 10.0
|
|||||||
# ensures only one reload stream is in-flight at a time.
|
# ensures only one reload stream is in-flight at a time.
|
||||||
_reload_all_lock: asyncio.Lock = asyncio.Lock()
|
_reload_all_lock: asyncio.Lock = asyncio.Lock()
|
||||||
|
|
||||||
|
# Capability detection for optional fail2ban transmitter commands (backend, idle).
|
||||||
|
# These commands are not supported in all fail2ban versions. Caching the result
|
||||||
|
# avoids sending unsupported commands every polling cycle and spamming the
|
||||||
|
# fail2ban log with "Invalid command" errors.
|
||||||
|
_backend_cmd_supported: bool | None = None
|
||||||
|
_backend_cmd_lock: asyncio.Lock = asyncio.Lock()
|
||||||
|
|
||||||
# ---------------------------------------------------------------------------
|
# ---------------------------------------------------------------------------
|
||||||
# Custom exceptions
|
# Custom exceptions
|
||||||
# ---------------------------------------------------------------------------
|
# ---------------------------------------------------------------------------
|
||||||
@@ -185,6 +192,51 @@ async def _safe_get(
|
|||||||
return default
|
return default
|
||||||
|
|
||||||
|
|
||||||
|
async def _check_backend_cmd_supported(
|
||||||
|
client: Fail2BanClient,
|
||||||
|
jail_name: str,
|
||||||
|
) -> bool:
|
||||||
|
"""Detect whether the fail2ban daemon supports optional ``get ... backend`` command.
|
||||||
|
|
||||||
|
Some fail2ban versions (e.g. LinuxServer.io container) do not implement the
|
||||||
|
optional ``get <jail> backend`` and ``get <jail> idle`` transmitter sub-commands.
|
||||||
|
This helper probes the daemon once and caches the result to avoid repeated
|
||||||
|
"Invalid command" errors in the fail2ban log.
|
||||||
|
|
||||||
|
Uses double-check locking to minimize lock contention in concurrent polls.
|
||||||
|
|
||||||
|
Args:
|
||||||
|
client: The :class:`~app.utils.fail2ban_client.Fail2BanClient` to use.
|
||||||
|
jail_name: Name of any jail to use for the probe command.
|
||||||
|
|
||||||
|
Returns:
|
||||||
|
``True`` if the command is supported, ``False`` otherwise.
|
||||||
|
Once determined, the result is cached and reused for all jails.
|
||||||
|
"""
|
||||||
|
global _backend_cmd_supported
|
||||||
|
|
||||||
|
# Fast path: return cached result if already determined.
|
||||||
|
if _backend_cmd_supported is not None:
|
||||||
|
return _backend_cmd_supported
|
||||||
|
|
||||||
|
# Slow path: acquire lock and probe the command once.
|
||||||
|
async with _backend_cmd_lock:
|
||||||
|
# Double-check idiom: another coroutine may have probed while we waited.
|
||||||
|
if _backend_cmd_supported is not None:
|
||||||
|
return _backend_cmd_supported
|
||||||
|
|
||||||
|
# Probe: send the command and catch any exception.
|
||||||
|
try:
|
||||||
|
_ok(await client.send(["get", jail_name, "backend"]))
|
||||||
|
_backend_cmd_supported = True
|
||||||
|
log.debug("backend_cmd_supported_detected")
|
||||||
|
except Exception:
|
||||||
|
_backend_cmd_supported = False
|
||||||
|
log.debug("backend_cmd_unsupported_detected")
|
||||||
|
|
||||||
|
return _backend_cmd_supported
|
||||||
|
|
||||||
|
|
||||||
# ---------------------------------------------------------------------------
|
# ---------------------------------------------------------------------------
|
||||||
# Public API — Jail listing & detail
|
# Public API — Jail listing & detail
|
||||||
# ---------------------------------------------------------------------------
|
# ---------------------------------------------------------------------------
|
||||||
@@ -238,7 +290,11 @@ async def _fetch_jail_summary(
|
|||||||
"""Fetch and build a :class:`~app.models.jail.JailSummary` for one jail.
|
"""Fetch and build a :class:`~app.models.jail.JailSummary` for one jail.
|
||||||
|
|
||||||
Sends the ``status``, ``get ... bantime``, ``findtime``, ``maxretry``,
|
Sends the ``status``, ``get ... bantime``, ``findtime``, ``maxretry``,
|
||||||
``backend``, and ``idle`` commands in parallel.
|
``backend``, and ``idle`` commands in parallel (if supported).
|
||||||
|
|
||||||
|
The ``backend`` and ``idle`` commands are optional and not supported in
|
||||||
|
all fail2ban versions. If not supported, this function will not send them
|
||||||
|
to avoid spamming the fail2ban log with "Invalid command" errors.
|
||||||
|
|
||||||
Args:
|
Args:
|
||||||
client: Shared :class:`~app.utils.fail2ban_client.Fail2BanClient`.
|
client: Shared :class:`~app.utils.fail2ban_client.Fail2BanClient`.
|
||||||
@@ -247,15 +303,38 @@ async def _fetch_jail_summary(
|
|||||||
Returns:
|
Returns:
|
||||||
A :class:`~app.models.jail.JailSummary` populated from the responses.
|
A :class:`~app.models.jail.JailSummary` populated from the responses.
|
||||||
"""
|
"""
|
||||||
_r = await asyncio.gather(
|
# Check whether optional backend/idle commands are supported.
|
||||||
|
# This probe happens once per session and is cached to avoid repeated
|
||||||
|
# "Invalid command" errors in the fail2ban log.
|
||||||
|
backend_cmd_is_supported = await _check_backend_cmd_supported(client, name)
|
||||||
|
|
||||||
|
# Build the gather list based on command support.
|
||||||
|
gather_list: list[Any] = [
|
||||||
client.send(["status", name, "short"]),
|
client.send(["status", name, "short"]),
|
||||||
client.send(["get", name, "bantime"]),
|
client.send(["get", name, "bantime"]),
|
||||||
client.send(["get", name, "findtime"]),
|
client.send(["get", name, "findtime"]),
|
||||||
client.send(["get", name, "maxretry"]),
|
client.send(["get", name, "maxretry"]),
|
||||||
client.send(["get", name, "backend"]),
|
]
|
||||||
client.send(["get", name, "idle"]),
|
|
||||||
return_exceptions=True,
|
if backend_cmd_is_supported:
|
||||||
)
|
# Commands are supported; send them for real values.
|
||||||
|
gather_list.extend([
|
||||||
|
client.send(["get", name, "backend"]),
|
||||||
|
client.send(["get", name, "idle"]),
|
||||||
|
])
|
||||||
|
uses_backend_backend_commands = True
|
||||||
|
else:
|
||||||
|
# Commands not supported; return default values without sending.
|
||||||
|
async def _return_default(value: Any) -> tuple[int, Any]:
|
||||||
|
return (0, value)
|
||||||
|
|
||||||
|
gather_list.extend([
|
||||||
|
_return_default("polling"), # backend default
|
||||||
|
_return_default(False), # idle default
|
||||||
|
])
|
||||||
|
uses_backend_backend_commands = False
|
||||||
|
|
||||||
|
_r = await asyncio.gather(*gather_list, return_exceptions=True)
|
||||||
status_raw: Any = _r[0]
|
status_raw: Any = _r[0]
|
||||||
bantime_raw: Any = _r[1]
|
bantime_raw: Any = _r[1]
|
||||||
findtime_raw: Any = _r[2]
|
findtime_raw: Any = _r[2]
|
||||||
@@ -569,7 +648,10 @@ async def reload_all(
|
|||||||
exclude_jails: Jail names to remove from the start stream.
|
exclude_jails: Jail names to remove from the start stream.
|
||||||
|
|
||||||
Raises:
|
Raises:
|
||||||
JailOperationError: If fail2ban reports the operation failed.
|
JailNotFoundError: If a jail in *include_jails* does not exist or
|
||||||
|
its configuration is invalid (e.g. missing logpath).
|
||||||
|
JailOperationError: If fail2ban reports the operation failed for
|
||||||
|
a different reason.
|
||||||
~app.utils.fail2ban_client.Fail2BanConnectionError: If the socket
|
~app.utils.fail2ban_client.Fail2BanConnectionError: If the socket
|
||||||
cannot be reached.
|
cannot be reached.
|
||||||
"""
|
"""
|
||||||
@@ -593,6 +675,12 @@ async def reload_all(
|
|||||||
_ok(await client.send(["reload", "--all", [], stream]))
|
_ok(await client.send(["reload", "--all", [], stream]))
|
||||||
log.info("all_jails_reloaded")
|
log.info("all_jails_reloaded")
|
||||||
except ValueError as exc:
|
except ValueError as exc:
|
||||||
|
# Detect UnknownJailException (missing or invalid jail configuration)
|
||||||
|
# and re-raise as JailNotFoundError for better error specificity.
|
||||||
|
if _is_not_found_error(exc):
|
||||||
|
# Extract the jail name from include_jails if available.
|
||||||
|
jail_name = include_jails[0] if include_jails else "unknown"
|
||||||
|
raise JailNotFoundError(jail_name) from exc
|
||||||
raise JailOperationError(str(exc)) from exc
|
raise JailOperationError(str(exc)) from exc
|
||||||
|
|
||||||
|
|
||||||
|
|||||||
@@ -3110,4 +3110,68 @@ class TestActivateJailRollback:
|
|||||||
assert result.active is False
|
assert result.active is False
|
||||||
assert result.recovered is False
|
assert result.recovered is False
|
||||||
|
|
||||||
|
async def test_activate_jail_rollback_on_jail_not_found_error(
|
||||||
|
self, tmp_path: Path
|
||||||
|
) -> None:
|
||||||
|
"""Rollback when reload_all raises JailNotFoundError (invalid config).
|
||||||
|
|
||||||
|
When fail2ban cannot create a jail due to invalid configuration
|
||||||
|
(e.g., missing logpath), it raises UnknownJailException which becomes
|
||||||
|
JailNotFoundError. This test verifies proper handling and rollback.
|
||||||
|
|
||||||
|
Expects:
|
||||||
|
- The .local file is restored to its original content.
|
||||||
|
- The response indicates recovered=True.
|
||||||
|
- The error message mentions the logpath issue.
|
||||||
|
"""
|
||||||
|
from app.models.config import ActivateJailRequest, JailValidationResult
|
||||||
|
from app.services.jail_service import JailNotFoundError
|
||||||
|
|
||||||
|
_write(tmp_path / "jail.conf", JAIL_CONF)
|
||||||
|
original_local = "[apache-auth]\nenabled = false\n"
|
||||||
|
local_path = tmp_path / "jail.d" / "apache-auth.local"
|
||||||
|
local_path.parent.mkdir(parents=True, exist_ok=True)
|
||||||
|
local_path.write_text(original_local)
|
||||||
|
|
||||||
|
req = ActivateJailRequest()
|
||||||
|
reload_call_count = 0
|
||||||
|
|
||||||
|
async def reload_side_effect(socket_path: str, **kwargs: object) -> None:
|
||||||
|
nonlocal reload_call_count
|
||||||
|
reload_call_count += 1
|
||||||
|
if reload_call_count == 1:
|
||||||
|
# Simulate UnknownJailException from fail2ban due to missing logpath.
|
||||||
|
raise JailNotFoundError("apache-auth")
|
||||||
|
# Recovery reload succeeds.
|
||||||
|
|
||||||
|
with (
|
||||||
|
patch(
|
||||||
|
"app.services.config_file_service._get_active_jail_names",
|
||||||
|
new=AsyncMock(return_value=set()),
|
||||||
|
),
|
||||||
|
patch("app.services.config_file_service.jail_service") as mock_js,
|
||||||
|
patch(
|
||||||
|
"app.services.config_file_service._probe_fail2ban_running",
|
||||||
|
new=AsyncMock(return_value=True),
|
||||||
|
),
|
||||||
|
patch(
|
||||||
|
"app.services.config_file_service._validate_jail_config_sync",
|
||||||
|
return_value=JailValidationResult(
|
||||||
|
jail_name="apache-auth", valid=True
|
||||||
|
),
|
||||||
|
),
|
||||||
|
):
|
||||||
|
mock_js.reload_all = AsyncMock(side_effect=reload_side_effect)
|
||||||
|
mock_js.JailNotFoundError = JailNotFoundError
|
||||||
|
result = await activate_jail(
|
||||||
|
str(tmp_path), "/fake.sock", "apache-auth", req
|
||||||
|
)
|
||||||
|
|
||||||
|
assert result.active is False
|
||||||
|
assert result.recovered is True
|
||||||
|
assert local_path.read_text() == original_local
|
||||||
|
# Verify the error message mentions logpath issues.
|
||||||
|
assert "logpath" in result.message.lower() or "check that all logpath" in result.message.lower()
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|||||||
@@ -184,10 +184,90 @@ class TestListJails:
|
|||||||
with patch("app.services.jail_service.Fail2BanClient", _FailClient), pytest.raises(Fail2BanConnectionError):
|
with patch("app.services.jail_service.Fail2BanClient", _FailClient), pytest.raises(Fail2BanConnectionError):
|
||||||
await jail_service.list_jails(_SOCKET)
|
await jail_service.list_jails(_SOCKET)
|
||||||
|
|
||||||
|
async def test_backend_idle_commands_unsupported(self) -> None:
|
||||||
|
"""list_jails handles unsupported backend and idle commands gracefully.
|
||||||
|
|
||||||
# ---------------------------------------------------------------------------
|
When the fail2ban daemon does not support get ... backend/idle commands,
|
||||||
# get_jail
|
list_jails should not send them, avoiding "Invalid command" errors in the
|
||||||
# ---------------------------------------------------------------------------
|
fail2ban log.
|
||||||
|
"""
|
||||||
|
# Reset the capability cache to test detection.
|
||||||
|
jail_service._backend_cmd_supported = None
|
||||||
|
|
||||||
|
responses = {
|
||||||
|
"status": _make_global_status("sshd"),
|
||||||
|
"status|sshd|short": _make_short_status(),
|
||||||
|
# Capability probe: get backend fails (command not supported).
|
||||||
|
"get|sshd|backend": (1, Exception("Invalid command (no get action or not yet implemented)")),
|
||||||
|
# Subsequent gets should still work.
|
||||||
|
"get|sshd|bantime": (0, 600),
|
||||||
|
"get|sshd|findtime": (0, 600),
|
||||||
|
"get|sshd|maxretry": (0, 5),
|
||||||
|
}
|
||||||
|
with _patch_client(responses):
|
||||||
|
result = await jail_service.list_jails(_SOCKET)
|
||||||
|
|
||||||
|
# Verify the result uses the default values for backend and idle.
|
||||||
|
jail = result.jails[0]
|
||||||
|
assert jail.backend == "polling" # default
|
||||||
|
assert jail.idle is False # default
|
||||||
|
# Capability should now be cached as False.
|
||||||
|
assert jail_service._backend_cmd_supported is False
|
||||||
|
|
||||||
|
async def test_backend_idle_commands_supported(self) -> None:
|
||||||
|
"""list_jails detects and sends backend/idle commands when supported."""
|
||||||
|
# Reset the capability cache to test detection.
|
||||||
|
jail_service._backend_cmd_supported = None
|
||||||
|
|
||||||
|
responses = {
|
||||||
|
"status": _make_global_status("sshd"),
|
||||||
|
"status|sshd|short": _make_short_status(),
|
||||||
|
# Capability probe: get backend succeeds.
|
||||||
|
"get|sshd|backend": (0, "systemd"),
|
||||||
|
# All other commands.
|
||||||
|
"get|sshd|bantime": (0, 600),
|
||||||
|
"get|sshd|findtime": (0, 600),
|
||||||
|
"get|sshd|maxretry": (0, 5),
|
||||||
|
"get|sshd|idle": (0, True),
|
||||||
|
}
|
||||||
|
with _patch_client(responses):
|
||||||
|
result = await jail_service.list_jails(_SOCKET)
|
||||||
|
|
||||||
|
# Verify real values are returned.
|
||||||
|
jail = result.jails[0]
|
||||||
|
assert jail.backend == "systemd" # real value
|
||||||
|
assert jail.idle is True # real value
|
||||||
|
# Capability should now be cached as True.
|
||||||
|
assert jail_service._backend_cmd_supported is True
|
||||||
|
|
||||||
|
async def test_backend_idle_commands_cached_after_first_probe(self) -> None:
|
||||||
|
"""list_jails caches capability result and reuses it across polling cycles."""
|
||||||
|
# Reset the capability cache.
|
||||||
|
jail_service._backend_cmd_supported = None
|
||||||
|
|
||||||
|
responses = {
|
||||||
|
"status": _make_global_status("sshd, nginx"),
|
||||||
|
# Probes happen once per polling cycle (for the first jail listed).
|
||||||
|
"status|sshd|short": _make_short_status(),
|
||||||
|
"status|nginx|short": _make_short_status(),
|
||||||
|
# Capability probe: backend is unsupported.
|
||||||
|
"get|sshd|backend": (1, Exception("Invalid command")),
|
||||||
|
# Subsequent jails do not trigger another probe; they use cached result.
|
||||||
|
# (The mock doesn't have get|nginx|backend because it shouldn't be called.)
|
||||||
|
"get|sshd|bantime": (0, 600),
|
||||||
|
"get|sshd|findtime": (0, 600),
|
||||||
|
"get|sshd|maxretry": (0, 5),
|
||||||
|
"get|nginx|bantime": (0, 600),
|
||||||
|
"get|nginx|findtime": (0, 600),
|
||||||
|
"get|nginx|maxretry": (0, 5),
|
||||||
|
}
|
||||||
|
with _patch_client(responses):
|
||||||
|
result = await jail_service.list_jails(_SOCKET)
|
||||||
|
|
||||||
|
# Both jails should return default values (cached result is False).
|
||||||
|
for jail in result.jails:
|
||||||
|
assert jail.backend == "polling"
|
||||||
|
assert jail.idle is False
|
||||||
|
|
||||||
|
|
||||||
class TestGetJail:
|
class TestGetJail:
|
||||||
@@ -339,6 +419,28 @@ class TestJailControls:
|
|||||||
_SOCKET, include_jails=["new"], exclude_jails=["old"]
|
_SOCKET, include_jails=["new"], exclude_jails=["old"]
|
||||||
)
|
)
|
||||||
|
|
||||||
|
async def test_reload_all_unknown_jail_raises_jail_not_found(self) -> None:
|
||||||
|
"""reload_all detects UnknownJailException and raises JailNotFoundError.
|
||||||
|
|
||||||
|
When fail2ban cannot load a jail due to invalid configuration (e.g.,
|
||||||
|
missing logpath), it raises UnknownJailException during reload. This
|
||||||
|
test verifies that reload_all detects this and re-raises as
|
||||||
|
JailNotFoundError instead of the generic JailOperationError.
|
||||||
|
"""
|
||||||
|
with _patch_client(
|
||||||
|
{
|
||||||
|
"status": _make_global_status("sshd"),
|
||||||
|
"reload|--all|[]|[['start', 'airsonic-auth'], ['start', 'sshd']]": (
|
||||||
|
1,
|
||||||
|
Exception("UnknownJailException('airsonic-auth')"),
|
||||||
|
),
|
||||||
|
}
|
||||||
|
), pytest.raises(jail_service.JailNotFoundError) as exc_info:
|
||||||
|
await jail_service.reload_all(
|
||||||
|
_SOCKET, include_jails=["airsonic-auth"]
|
||||||
|
)
|
||||||
|
assert exc_info.value.name == "airsonic-auth"
|
||||||
|
|
||||||
async def test_start_not_found_raises(self) -> None:
|
async def test_start_not_found_raises(self) -> None:
|
||||||
"""start_jail raises JailNotFoundError for unknown jail."""
|
"""start_jail raises JailNotFoundError for unknown jail."""
|
||||||
with _patch_client({"start|ghost": (1, Exception("Unknown jail: 'ghost'"))}), pytest.raises(JailNotFoundError):
|
with _patch_client({"start|ghost": (1, Exception("Unknown jail: 'ghost'"))}), pytest.raises(JailNotFoundError):
|
||||||
|
|||||||
Reference in New Issue
Block a user