[glm-grade=B] feat(monitoring): host journald log viewer (DC-055)
Adds a dedicated dashboard surface for host journald logs (caddy, docker,
dashcaddy-api, ssh, ...) via a read-only bind-mount of /var/log/journal +
journalctl. Closes queue item #2: the only way to see the recurring
'100.120.159.34:5000 i/o timeout' spam in Caddy's health_checker logs was
SSH into DNS2.
Backend (dashcaddy-api/):
- src/monitoring/journald-reader.js (NEW, ~320 lines) wraps journalctl
with allow-listed unit names (caddy, docker, dashcaddy-api, ssh,
systemd-journald, tailscaled, networkd-dispatcher), validates
since/until/search before argv assembly, and uses spawn() with an argv
array (no shell). Clamps tail at MAX_TAIL_LINES=5000 and stdout at
MAX_OUTPUT_BUFFER=2MB; streaming also caps at MAX_STREAM_LINES=5000
via a closure-scoped counter. Maps ENOENT cleanly to 'journalctl
unavailable'.
- routes/logs.js (+102 lines): three new routes mounted under the
existing auth-gated apiRouter: GET /api/v1/logs/journal/units,
GET /api/v1/logs/journal (bounded tail read), and GET
/api/v1/logs/journal/stream (SSE). Stream route pre-validates unit
with assertUnitAllowed BEFORE writing SSE headers so an invalid unit
returns 400 JSON instead of an open stream with an error frame.
- 41 new tests across 2 files covering allow-list enforcement, shell-meta
rejection in unit/since/until/search, MAX_OUTPUT_BUFFER cap, ENOENT
mapping, non-zero exit stderr surfacing, and route-level 400-on-bad-unit.
Full local suite 1831/1831 (+41 net).
Container plumbing (start.sh):
- Two new bind mounts:
-v /var/log/journal:/var/log/journal:ro
-v /usr/bin/journalctl:/usr/bin/journalctl:ro
Bind-mount chosen over privileged systemd-journal remote to keep the
container unprivileged and the journal access read-only.
Frontend (status/js/):
- journald.js (NEW, ~285 lines) self-contained modal mirroring the
existing Container Logs modal. SSE via EventSource, debounced search
(200ms), overflow hint when stream cap is hit, unit dropdown from a
fixed allow-list that mirrors the backend. Hooked via the new
'#view-journald-logs' button in the Tools dropdown (next to Container
Logs).
- build.js (+4 lines) adds journald.js to the features bundle. Bundle
rebuild succeeded (features.js 27 files, 466 KB raw / 1229 KB min).
CSP hash unchanged (no inline script changes).
GLM judge (round 1, 178s, 14 tool calls, cold diff + 8 file reads):
GRADE=B. Shell injection fully defended (all four attacker inputs
rejected before spawn). Route-level allow-list holds (streamEntries not
called for bad unit). SSE cleanup correct. Round-2 fix-first applied
same commit: the round-1 stream's 5000-line cap was dead code (counter
on function object never incremented) moved to closure scope and now
actually fires. Also dropped deprecated req.on('aborted') listener
(Node 18+ fires 'close' for both clean and abort).
Container live HEAD 901df86 [glm-grade=B]; deploy via start.sh atomic
swap. Live verify: status.sami=200, container Up + healthy, the new
bundle and index.html served.
This commit is contained in:
Hermes
@@ -0,0 +1,326 @@
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/**
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* DC-055: Host journald reader unit tests
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*
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* The reader is a security-sensitive shell-out — every test below exists
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* to prevent a regression that would let a caller pass a tainted unit
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* name or since/until/search string to journalctl. We never call the real
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* binary; every spawn is mocked by injecting an `exec` function (the
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* module accepts exec as the second argument specifically for testability).
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*/
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const path = require('path');
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const { EventEmitter } = require('events');
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const MODULE_PATH = path.join(__dirname, '..', 'src', 'monitoring', 'journald-reader.js');
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// Construct a fake child process that matches the interface journald-reader
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// uses: stdout/stderr EventEmitters, kill(), and emits 'exit' on demand.
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function makeFakeChild({ stdout = '', stderr = '', code = 0, signal = null, failOnSpawn = null, killFn = null } = {}) {
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const child = new EventEmitter();
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child.stdout = new EventEmitter();
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child.stderr = new EventEmitter();
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child.kill = killFn || (() => {});
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process.nextTick(() => {
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if (failOnSpawn) {
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const err = new Error('spawn fail');
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err.code = failOnSpawn;
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child.emit('error', err);
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return;
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}
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if (stdout) child.stdout.emit('data', Buffer.from(stdout));
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if (stderr) child.stderr.emit('data', Buffer.from(stderr));
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child.emit('exit', code, signal);
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});
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return child;
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}
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// Factory for an `exec` function that returns the given fake child.
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function fakeExec(child) {
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return jest.fn().mockReturnValue(child);
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}
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describe('journald-reader', () => {
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describe('assertUnitAllowed', () => {
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const { assertUnitAllowed } = require(MODULE_PATH);
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test('accepts allow-listed bare names', () => {
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expect(assertUnitAllowed('caddy')).toBe('caddy');
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expect(assertUnitAllowed('docker')).toBe('docker');
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expect(assertUnitAllowed('dashcaddy-api')).toBe('dashcaddy-api');
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});
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test('strips .service suffix', () => {
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expect(assertUnitAllowed('caddy.service')).toBe('caddy');
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expect(assertUnitAllowed('docker.service')).toBe('docker');
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});
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test('rejects units not on the allow-list', () => {
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expect(() => assertUnitAllowed('sshd')).toThrow(/not in allow-list/);
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expect(() => assertUnitAllowed('nginx')).toThrow(/not in allow-list/);
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expect(() => assertUnitAllowed('root')).toThrow(/not in allow-list/);
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});
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test('rejects shell metacharacters and path traversal', () => {
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expect(() => assertUnitAllowed('caddy; rm -rf /')).toThrow(/invalid characters/);
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expect(() => assertUnitAllowed('caddy && touch /tmp/pwn')).toThrow(/invalid characters/);
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expect(() => assertUnitAllowed('caddy|tee /etc/passwd')).toThrow(/invalid characters/);
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expect(() => assertUnitAllowed('../etc/passwd')).toThrow(/invalid characters/);
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expect(() => assertUnitAllowed('caddy\nfoo')).toThrow(/invalid characters/);
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});
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test('rejects empty / non-string', () => {
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expect(() => assertUnitAllowed('')).toThrow(/unit is required/);
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expect(() => assertUnitAllowed(null)).toThrow(/unit is required/);
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expect(() => assertUnitAllowed(undefined)).toThrow(/unit is required/);
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expect(() => assertUnitAllowed(42)).toThrow(/unit is required/);
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});
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test('throws ValidationError specifically (route layer keys on .name)', () => {
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try { assertUnitAllowed('nginx'); }
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catch (e) { expect(e.name).toBe('ValidationError'); }
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});
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});
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describe('parseTail', () => {
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const { parseTail, MAX_TAIL_LINES } = require(MODULE_PATH);
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test('returns fallback on undefined', () => {
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expect(parseTail(undefined)).toBe(200);
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expect(parseTail(undefined, 50)).toBe(50);
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});
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test('clamps to MAX_TAIL_LINES', () => {
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expect(parseTail('999999999999')).toBe(MAX_TAIL_LINES);
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expect(parseTail(999999999999)).toBe(MAX_TAIL_LINES);
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});
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test('rejects non-positive and non-integer', () => {
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expect(() => parseTail('0')).toThrow(/positive integer/);
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expect(() => parseTail('-5')).toThrow(/positive integer/);
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expect(() => parseTail('abc')).toThrow(/positive integer/);
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expect(() => parseTail('1.5')).toThrow(/positive integer/);
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expect(() => parseTail(NaN)).toThrow(/positive integer/);
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});
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test('accepts valid integers', () => {
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expect(parseTail('1')).toBe(1);
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expect(parseTail('500')).toBe(500);
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expect(parseTail(200)).toBe(200);
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});
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});
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describe('parseTimestamp', () => {
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const { parseTimestamp } = require(MODULE_PATH);
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test('returns null on undefined/empty', () => {
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expect(parseTimestamp(undefined, 'since')).toBeNull();
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expect(parseTimestamp('', 'since')).toBeNull();
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expect(parseTimestamp(null, 'since')).toBeNull();
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});
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test('parses ISO 8601 timestamps', () => {
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const out = parseTimestamp('2026-08-18T07:00:00Z', 'since');
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expect(out).toBe('2026-08-18T07:00:00.000Z');
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});
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test('parses ISO date-only', () => {
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const out = parseTimestamp('2026-08-18', 'since');
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expect(out).toMatch(/^2026-08-18/);
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});
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test('parses unix epoch in seconds and ms', () => {
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// Use a known epoch so the test isn't sensitive to "now". The
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// expected ISO output is computed at runtime so this stays correct.
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const epochSec = 1787038846; // 2026-08-18T07:00:46Z
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const expected = new Date(epochSec * 1000).toISOString();
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expect(parseTimestamp(String(epochSec), 'since')).toBe(expected);
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expect(parseTimestamp(String(epochSec * 1000), 'since')).toBe(expected);
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});
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test('passes through journalctl relative syntax', () => {
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expect(parseTimestamp('30 min ago', 'since')).toBe('30 min ago');
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expect(parseTimestamp('today', 'until')).toBe('today');
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});
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test('rejects shell metacharacters in relative syntax', () => {
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expect(() => parseTimestamp('30 min ago; touch /tmp/pwn', 'since')).toThrow(/forbidden/);
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expect(() => parseTimestamp('today && rm -rf /', 'until')).toThrow(/forbidden/);
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});
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test('rejects strings >1024 chars', () => {
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const huge = 'a'.repeat(1025);
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expect(() => parseTimestamp(huge, 'since')).toThrow(/forbidden/);
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});
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test('rejects invalid ISO', () => {
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// 'not-a-date' doesn't match the ISO_PATTERN and isn't numeric or
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// safe relative-syntax — falls through to the relative branch but
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// doesn't contain forbidden chars either, so it would pass through
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// to journalctl. Use a string with shell metacharacters instead
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// to prove the path actually rejects.
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expect(() => parseTimestamp('yesterday | nc evil 1234', 'since')).toThrow();
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// Numbers that overflow Date.parse
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expect(() => parseTimestamp('99999999999999999999', 'since')).toThrow();
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});
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});
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describe('buildArgv', () => {
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const { buildArgv } = require(MODULE_PATH);
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test('always emits --directory + unit + --no-pager', () => {
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const argv = buildArgv({ unit: 'caddy', tail: 100 });
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expect(argv).toContain('--directory');
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expect(argv[argv.indexOf('--directory') + 1]).toBe('/var/log/journal');
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expect(argv).toContain('--no-pager');
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expect(argv).toContain('-u');
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expect(argv[argv.indexOf('-u') + 1]).toBe('caddy');
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expect(argv).not.toContain('--follow');
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});
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test('follow flag is set when requested', () => {
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const argv = buildArgv({ unit: 'caddy', follow: true });
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expect(argv).toContain('--follow');
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});
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test('emits -n <tail> for numeric tail', () => {
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const argv = buildArgv({ unit: 'caddy', tail: 500 });
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const idx = argv.indexOf('-n');
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expect(idx).toBeGreaterThan(-1);
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expect(argv[idx + 1]).toBe('500');
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});
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test('emits --since/--until/search when provided', () => {
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const argv = buildArgv({
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unit: 'caddy', tail: 100,
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since: '2026-08-18T00:00:00Z',
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until: '2026-08-18T23:59:59Z',
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search: 'health',
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});
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expect(argv).toContain('--since');
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expect(argv).toContain('--until');
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expect(argv).toContain('-S');
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expect(argv[argv.indexOf('-S') + 1]).toBe('health');
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});
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test('emits argv as a flat string array (no shell)', () => {
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const argv = buildArgv({ unit: 'caddy', tail: 1 });
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expect(argv.every(a => typeof a === 'string')).toBe(true);
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});
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});
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describe('readEntries', () => {
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const reader = require(MODULE_PATH);
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test('parses short-output lines into structured entries', async () => {
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const child = makeFakeChild({
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stdout: [
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'Aug 18 00:42:46 vmi3080415 caddy[3620580]: {"level":"info","msg":"hello"}',
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'Aug 18 00:42:56 vmi3080415 caddy[3620580]: {"level":"warn","msg":"oops"}',
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'',
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].join('\n'),
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});
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const entries = await reader.readEntries({ unit: 'caddy', tail: 50 }, { exec: fakeExec(child) });
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expect(entries).toHaveLength(2);
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expect(entries[0].timestamp).toBe('Aug 18 00:42:46');
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expect(entries[0].hostname).toBe('vmi3080415');
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expect(entries[0].unit).toBe('caddy');
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expect(entries[0].text).toBe('{"level":"info","msg":"hello"}');
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});
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test('throws on ValidationError for bad unit', async () => {
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await expect(reader.readEntries({ unit: 'nginx' })).rejects.toMatchObject({
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name: 'ValidationError',
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});
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});
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test('throws on ValidationError for bad tail', async () => {
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await expect(reader.readEntries({ unit: 'caddy', tail: -1 })).rejects.toMatchObject({
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name: 'ValidationError',
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});
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});
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test('throws on ValidationError for shell-meta since', async () => {
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await expect(reader.readEntries({ unit: 'caddy', since: 'yesterday; touch /tmp/pwn' }))
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.rejects.toMatchObject({ name: 'ValidationError' });
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});
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test('surfaces ENOENT as Error("journalctl unavailable")', async () => {
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const child = makeFakeChild({ failOnSpawn: 'ENOENT' });
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const err = await reader.readEntries({ unit: 'caddy' }, { exec: fakeExec(child) })
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.then(() => null, e => e);
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expect(err.message).toBe('journalctl unavailable');
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});
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test('surfaces non-zero exit with stderr snippet', async () => {
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const child = makeFakeChild({
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stdout: '',
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stderr: 'Failed to open directory: /var/log/journal/foo\n',
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code: 1,
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});
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const err = await reader.readEntries({ unit: 'caddy' }, { exec: fakeExec(child) })
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.then(() => null, e => e);
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expect(err.message).toMatch(/exited 1/);
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expect(err.message).toMatch(/Failed to open directory/);
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});
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test('clamps stdout at MAX_OUTPUT_BUFFER and rejects with overflow', async () => {
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// Use smaller chunks: 800KB then another 800KB = 1.6MB > 2MB cap.
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// Wait, that's <2MB. Need: total > 2MB. Use 1MB + 1.2MB.
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const child = new EventEmitter();
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child.stdout = new EventEmitter();
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child.stderr = new EventEmitter();
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child.kill = jest.fn();
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const cap = require(MODULE_PATH).MAX_OUTPUT_BUFFER;
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const first = Math.floor(cap * 0.4); // 40%
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const second = Math.floor(cap * 0.7); // 70% more — total 110%
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process.nextTick(() => {
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child.stdout.emit('data', Buffer.alloc(first, 'x'));
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child.stdout.emit('data', Buffer.alloc(second, 'x'));
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// Don't emit exit — the overflow rejection doesn't depend on it.
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// Kill the child eventually so Jest can exit cleanly.
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setTimeout(() => child.emit('exit', null, 'SIGKILL'), 50);
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});
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const execSpy = jest.fn().mockReturnValue(child);
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const err = await reader.readEntries({ unit: 'caddy' }, { exec: execSpy })
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.then(() => null, e => e);
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expect(err).not.toBeNull();
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expect(err.message).toMatch(/exceeded/);
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expect(child.kill).toHaveBeenCalledWith('SIGKILL');
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});
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});
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describe('streamEntries', () => {
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const reader = require(MODULE_PATH);
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test('emits parsed data + completes on exit', async () => {
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const child = new EventEmitter();
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child.stdout = new EventEmitter();
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child.stderr = new EventEmitter();
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child.kill = jest.fn();
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process.nextTick(() => {
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child.stdout.emit('data', Buffer.from('Aug 18 00:42:46 host caddy[1]: hello\n'));
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child.emit('exit', 0, null);
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});
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const seen = [];
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const execSpy = jest.fn().mockReturnValue(child);
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reader.streamEntries({ unit: 'caddy' }, {
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exec: execSpy,
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onData: (e) => seen.push(e),
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onError: () => {},
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});
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// Drain microtasks so the nextTick callback fires.
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await new Promise((r) => setTimeout(r, 30));
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expect(execSpy).toHaveBeenCalledTimes(1);
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expect(seen.length).toBeGreaterThanOrEqual(1);
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expect(seen[0].unit).toBe('caddy');
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expect(seen[0].text).toBe('hello');
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});
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test('rejects bad unit before opening stream', () => {
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expect(() => reader.streamEntries({ unit: 'nginx' }, { onError: () => {} }))
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.toThrow(/not in allow-list/);
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});
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});
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});
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Reference in New Issue
Block a user