sip: TLS transport with a checked certificate, TLS + SRTP trunks

The certificate lives in data/tls (fullchain.pem + privkey.pem), mounted
read-only into asterisk and the api. Asterisk quietly drops transport-tls
when the files are missing, so the api won't turn TLS on unless they load
and match, shows the certificate on Settings -> Security, and warns on the
dashboard when it expires within 14 days. scripts/tls-cert.sh copies it
from the bundled Caddy (or given paths) and reloads res_pjsip: Asterisk 24
re-reads a changed certificate on reload, calls stay up.

transport-tls checks the provider's certificate (verify_server). Asterisk
24 checks a qualify's certificate against the IP instead of the name, which
fails on voip.ms, so TLS trunks don't qualify; REGISTER and INVITE verify
the name fine.

Task: M11-T2

apps/api/test/tls.test.ts

@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+// M11-T2: the SIP TLS certificate check, turning TLS on, and the expiry warning.
+import { spawnSync } from 'node:child_process';
+import { copyFileSync, mkdtempSync, rmSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import type { LightMyRequestResponse } from 'fastify';
+import { afterAll, beforeAll, describe, expect, it } from 'vitest';
+import { readTlsCert } from '../src/services/tls.ts';
+import { hasTestDb } from './db.ts';
+import { ADMIN, H, createTestApp } from './app.ts';
+
+const hasOpenssl = spawnSync('openssl', ['version']).status === 0;
+const work = mkdtempSync(join(tmpdir(), 'sp-tls-certs-'));
+/** A self-signed cert + key named <name>.crt/.key, valid for `days`. */
+function makeCert(name: string, days: number) {
+  const r = spawnSync(
+    'openssl',
+    ['req', '-x509', '-newkey', 'rsa:2048', '-nodes', '-days', String(days)]
+      .concat([
+        '-subj',
+        `/CN=${name}.example.com`,
+        '-addext',
+        `subjectAltName=DNS:${name}.example.com`,
+      ])
+      .concat(['-keyout', join(work, `${name}.key`), '-out', join(work, `${name}.crt`)]),
+    { env: { ...process.env, MSYS_NO_PATHCONV: '1' } }, // Git Bash's openssl mangles /CN=
+  );
+  if (r.status !== 0) throw new Error(String(r.stderr));
+}
+/** Puts <cert>'s certificate and <key>'s key where the api (and Asterisk) look. */
+function install(dir: string, cert: string, key = cert) {
+  copyFileSync(join(work, `${cert}.crt`), join(dir, 'fullchain.pem'));
+  copyFileSync(join(work, `${key}.key`), join(dir, 'privkey.pem'));
+}
+
+describe.skipIf(!hasOpenssl)('readTlsCert', () => {
+  beforeAll(() => {
+    makeCert('pbx', 365);
+    makeCert('other', 365);
+  });
+
+  it('missing files, a key that does not match, a good pair', async () => {
+    const dir = mkdtempSync(join(tmpdir(), 'sp-tls-'));
+    expect(await readTlsCert(dir)).toMatchObject({ ok: false, error: /No certificate/ });
+    install(dir, 'pbx', 'other');
+    expect(await readTlsCert(dir)).toMatchObject({ ok: false, error: /doesn't belong/ });
+    install(dir, 'pbx');
+    const c = await readTlsCert(dir);
+    expect(c).toMatchObject({
+      ok: true,
+      subject: 'CN=pbx.example.com',
+      names: ['DNS:pbx.example.com'],
+    });
+    if (c.ok) expect(Date.parse(c.notAfter) - Date.now()).toBeGreaterThan(300 * 86_400_000);
+    rmSync(dir, { recursive: true });
+  });
+});
+
+describe.skipIf(!hasTestDb || !hasOpenssl)('SIP TLS setting', () => {
+  const dir = mkdtempSync(join(tmpdir(), 'sp-tls-'));
+  let t: Awaited<ReturnType<typeof createTestApp>>;
+  let req: (method: string, url: string, payload?: unknown) => Promise<LightMyRequestResponse>;
+  const warningCodes = async () =>
+    (await req('GET', '/api/system/warnings')).json().items.map((w: { code: string }) => w.code);
+
+  beforeAll(async () => {
+    makeCert('soon', 5);
+    makeCert('pbx', 365);
+    t = await createTestApp(undefined, { TLS_DIR: dir });
+    await t.clearMustChange(ADMIN.email);
+    const cookie = await t.login(ADMIN.email, ADMIN.password);
+    req = (method, url, payload) =>
+      t.app.inject({
+        method: method as 'GET',
+        url,
+        payload: payload as object,
+        headers: { ...H, cookie },
+      });
+  });
+  afterAll(async () => {
+    await t?.close();
+    rmSync(dir, { recursive: true });
+    rmSync(work, { recursive: true, force: true });
+  });
+
+  it("won't turn on without a certificate", async () => {
+    const r = await req('PATCH', '/api/settings', { 'sip.tlsEnabled': true });
+    expect(r.statusCode).toBe(400);
+    expect(r.json().error.message).toMatch(/Can't turn on TLS. No certificate/);
+    expect((await req('GET', '/api/system/tls')).json()).toMatchObject({ ok: false });
+  });
+
+  it('turns on with one, warns when it expires within 14 days', async () => {
+    install(dir, 'soon');
+    const r = await req('PATCH', '/api/settings', { 'sip.tlsEnabled': true });
+    expect(r.statusCode).toBe(200);
+    expect(r.json()['sip.tlsEnabled']).toBe(true);
+    expect((await req('GET', '/api/system/tls')).json()).toMatchObject({
+      ok: true,
+      subject: 'CN=soon.example.com',
+    });
+    expect(await warningCodes()).toContain('tls_cert');
+    install(dir, 'pbx'); // renewed
+    expect(await warningCodes()).not.toContain('tls_cert');
+  });
+
+  it('a TLS trunk: no qualify, Test does not send OPTIONS, TLS stays on while it exists', async () => {
+    const trunk = await req('POST', '/api/trunks', {
+      name: 'voip.ms TLS',
+      serverHost: '127.0.0.1',
+      serverPort: 5061,
+      transport: 'tls',
+      srtp: true,
+      username: '123456_pbx',
+      password: 'pw',
+    });
+    expect(trunk.statusCode).toBe(201);
+    await t.app.generator.apply({ trigger: 'test' });
+    const { readFile } = await import('node:fs/promises');
+    const conf = await readFile(join(t.app.generator.dir, 'pjsip_selfphoneng.conf'), 'utf8');
+    expect(conf).toMatch(/contact = sip:127\.0\.0\.1:5061;transport=tls\nqualify_frequency = 0\n/);
+    expect(conf).toMatch(/media_encryption = sdes/);
+    expect(conf).toMatch(/verify_server = yes/);
+    t.live.amiConnected = true;
+    const test = await req('POST', `/api/trunks/${trunk.json().id}/test`);
+    expect(test.statusCode).toBe(200);
+    expect(t.ami.actions.filter((a) => a.Action === 'PJSIPQualify')).toEqual([]);
+    const off = await req('PATCH', '/api/settings', { 'sip.tlsEnabled': false });
+    expect(off.statusCode).toBe(400);
+    expect(off.json().error.message).toMatch(/uses TLS/);
+  });
+});