dcrouter/test/suite/security/test.dmarc-policy.ts

import { tap, expect } from '@git.zone/tstest/tapbundle';
import * as plugins from '../../../ts/plugins.js';
import * as net from 'net';
import { startTestServer, stopTestServer } from '../../helpers/server.loader.js';

const TEST_PORT = 2525;
import type { SmtpServer } from '../../../ts/mail/delivery/smtpserver/index.js';

let testServer: SmtpServer;

tap.test('setup - start test server', async () => {
  testServer = await startTestServer({ port: TEST_PORT });
  await plugins.smartdelay.delayFor(1000);
});

tap.test('DMARC Policy - Reject policy enforcement', async (tools) => {
  const done = tools.defer();
  
  const socket = net.createConnection({
    host: 'localhost',
    port: TEST_PORT,
    timeout: 30000
  });
  
  let dataBuffer = '';
  let step = 'greeting';
  
  socket.on('data', (data) => {
    dataBuffer += data.toString();
    console.log('Server response:', data.toString());
    
    if (step === 'greeting' && dataBuffer.includes('220 ')) {
      step = 'ehlo';
      socket.write('EHLO testclient\r\n');
      dataBuffer = '';
    } else if (step === 'ehlo' && dataBuffer.includes('250')) {
      // Check if server advertises DMARC support
      const advertisesDmarc = dataBuffer.toLowerCase().includes('dmarc');
      console.log('DMARC advertised:', advertisesDmarc);
      
      step = 'mail';
      // Domain with reject policy
      socket.write('MAIL FROM:<test@dmarc-reject.example.com>\r\n');
      dataBuffer = '';
    } else if (step === 'mail') {
      if (dataBuffer.includes('250')) {
        step = 'rcpt';
        socket.write('RCPT TO:<recipient@example.com>\r\n');
        dataBuffer = '';
      } else if (dataBuffer.includes('550') || dataBuffer.includes('553')) {
        console.log('DMARC reject policy enforced at MAIL FROM');
        expect(true).toEqual(true);
        
        socket.write('QUIT\r\n');
        socket.end();
        done.resolve();
      }
    } else if (step === 'rcpt' && dataBuffer.includes('250')) {
      step = 'data';
      socket.write('DATA\r\n');
      dataBuffer = '';
    } else if (step === 'data' && dataBuffer.includes('354')) {
      // Send email with DMARC-relevant headers
      const email = [
        `From: test@dmarc-reject.example.com`,
        `To: recipient@example.com`,
        `Subject: DMARC Policy Test - Reject`,
        `Date: ${new Date().toUTCString()}`,
        `Message-ID: <dmarc-reject-${Date.now()}@example.com>`,
        `DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dmarc-reject.example.com; s=default;`,
        `        h=from:to:subject:date; bh=test; b=test`,
        '',
        'Testing DMARC reject policy enforcement.',
        '.',
        ''
      ].join('\r\n');
      
      socket.write(email);
      dataBuffer = '';
    } else if (dataBuffer.includes('250 ') || dataBuffer.includes('550 ')) {
      const accepted = dataBuffer.includes('250');
      const rejected = dataBuffer.includes('550');
      
      console.log(`DMARC reject policy: accepted=${accepted}, rejected=${rejected}`);
      expect(accepted || rejected).toEqual(true);
      
      socket.write('QUIT\r\n');
      socket.end();
      done.resolve();
    }
  });
  
  socket.on('error', (err) => {
    console.error('Socket error:', err);
    done.reject(err);
  });
  
  await done.promise;
});

tap.test('DMARC Policy - Quarantine policy', async (tools) => {
  const done = tools.defer();
  
  const socket = net.createConnection({
    host: 'localhost',
    port: TEST_PORT,
    timeout: 30000
  });
  
  let dataBuffer = '';
  let step = 'greeting';
  
  socket.on('data', (data) => {
    dataBuffer += data.toString();
    console.log('Server response:', data.toString());
    
    if (step === 'greeting' && dataBuffer.includes('220 ')) {
      step = 'ehlo';
      socket.write('EHLO testclient\r\n');
      dataBuffer = '';
    } else if (step === 'ehlo' && dataBuffer.includes('250')) {
      step = 'mail';
      // Domain with quarantine policy
      socket.write('MAIL FROM:<test@dmarc-quarantine.example.com>\r\n');
      dataBuffer = '';
    } else if (step === 'mail' && dataBuffer.includes('250')) {
      step = 'rcpt';
      socket.write('RCPT TO:<recipient@example.com>\r\n');
      dataBuffer = '';
    } else if (step === 'rcpt' && dataBuffer.includes('250')) {
      step = 'data';
      socket.write('DATA\r\n');
      dataBuffer = '';
    } else if (step === 'data' && dataBuffer.includes('354')) {
      const email = [
        `From: test@dmarc-quarantine.example.com`,
        `To: recipient@example.com`,
        `Subject: DMARC Policy Test - Quarantine`,
        `Date: ${new Date().toUTCString()}`,
        `Message-ID: <dmarc-quarantine-${Date.now()}@example.com>`,
        '',
        'Testing DMARC quarantine policy.',
        '.',
        ''
      ].join('\r\n');
      
      socket.write(email);
      dataBuffer = '';
    } else if (dataBuffer.includes('250 ') || dataBuffer.includes('550 ')) {
      const accepted = dataBuffer.includes('250');
      console.log(`DMARC quarantine policy: ${accepted ? 'accepted (may be quarantined)' : 'rejected'}`);
      expect(true).toEqual(true);
      
      socket.write('QUIT\r\n');
      socket.end();
      done.resolve();
    }
  });
  
  socket.on('error', (err) => {
    console.error('Socket error:', err);
    done.reject(err);
  });
  
  await done.promise;
});

tap.test('DMARC Policy - None policy', async (tools) => {
  const done = tools.defer();
  
  const socket = net.createConnection({
    host: 'localhost',
    port: TEST_PORT,
    timeout: 30000
  });
  
  let dataBuffer = '';
  let step = 'greeting';
  
  socket.on('data', (data) => {
    dataBuffer += data.toString();
    console.log('Server response:', data.toString());
    
    if (step === 'greeting' && dataBuffer.includes('220 ')) {
      step = 'ehlo';
      socket.write('EHLO testclient\r\n');
      dataBuffer = '';
    } else if (step === 'ehlo' && dataBuffer.includes('250')) {
      step = 'mail';
      // Domain with none policy (monitoring only)
      socket.write('MAIL FROM:<test@dmarc-none.example.com>\r\n');
      dataBuffer = '';
    } else if (step === 'mail' && dataBuffer.includes('250')) {
      step = 'rcpt';
      socket.write('RCPT TO:<recipient@example.com>\r\n');
      dataBuffer = '';
    } else if (step === 'rcpt' && dataBuffer.includes('250')) {
      step = 'data';
      socket.write('DATA\r\n');
      dataBuffer = '';
    } else if (step === 'data' && dataBuffer.includes('354')) {
      const email = [
        `From: test@dmarc-none.example.com`,
        `To: recipient@example.com`,
        `Subject: DMARC Policy Test - None`,
        `Date: ${new Date().toUTCString()}`,
        `Message-ID: <dmarc-none-${Date.now()}@example.com>`,
        '',
        'Testing DMARC none policy (monitoring only).',
        '.',
        ''
      ].join('\r\n');
      
      socket.write(email);
      dataBuffer = '';
    } else if (dataBuffer.includes('250 ') && dataBuffer.includes('Message accepted')) {
      console.log('DMARC none policy: email accepted (monitoring only)');
      expect(true).toEqual(true);
      
      socket.write('QUIT\r\n');
      socket.end();
      done.resolve();
    }
  });
  
  socket.on('error', (err) => {
    console.error('Socket error:', err);
    done.reject(err);
  });
  
  await done.promise;
});

tap.test('DMARC Policy - Alignment testing', async (tools) => {
  const done = tools.defer();
  
  const socket = net.createConnection({
    host: 'localhost',
    port: TEST_PORT,
    timeout: 30000
  });
  
  let dataBuffer = '';
  let step = 'greeting';
  
  socket.on('data', (data) => {
    dataBuffer += data.toString();
    console.log('Server response:', data.toString());
    
    if (step === 'greeting' && dataBuffer.includes('220 ')) {
      step = 'ehlo';
      socket.write('EHLO testclient\r\n');
      dataBuffer = '';
    } else if (step === 'ehlo' && dataBuffer.includes('250')) {
      step = 'mail';
      // Envelope From domain
      socket.write('MAIL FROM:<test@envelope-domain.com>\r\n');
      dataBuffer = '';
    } else if (step === 'mail' && dataBuffer.includes('250')) {
      step = 'rcpt';
      socket.write('RCPT TO:<recipient@example.com>\r\n');
      dataBuffer = '';
    } else if (step === 'rcpt' && dataBuffer.includes('250')) {
      step = 'data';
      socket.write('DATA\r\n');
      dataBuffer = '';
    } else if (step === 'data' && dataBuffer.includes('354')) {
      // Header From different from envelope (tests alignment)
      const email = [
        `From: test@header-domain.com`,
        `To: recipient@example.com`,
        `Subject: DMARC Alignment Test`,
        `Date: ${new Date().toUTCString()}`,
        `Message-ID: <dmarc-align-${Date.now()}@example.com>`,
        `DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=header-domain.com; s=default;`,
        `        h=from:to:subject:date; bh=test; b=test`,
        '',
        'Testing DMARC domain alignment (envelope vs header From).',
        '.',
        ''
      ].join('\r\n');
      
      socket.write(email);
      dataBuffer = '';
    } else if (dataBuffer.includes('250 ') || dataBuffer.includes('550 ')) {
      const result = dataBuffer.includes('250') ? 'accepted' : 'rejected';
      console.log(`DMARC alignment test: ${result}`);
      expect(true).toEqual(true);
      
      socket.write('QUIT\r\n');
      socket.end();
      done.resolve();
    }
  });
  
  socket.on('error', (err) => {
    console.error('Socket error:', err);
    done.reject(err);
  });
  
  await done.promise;
});

tap.test('DMARC Policy - Percentage testing', async (tools) => {
  const done = tools.defer();
  
  const socket = net.createConnection({
    host: 'localhost',
    port: TEST_PORT,
    timeout: 30000
  });
  
  let dataBuffer = '';
  let step = 'greeting';
  
  socket.on('data', (data) => {
    dataBuffer += data.toString();
    console.log('Server response:', data.toString());
    
    if (step === 'greeting' && dataBuffer.includes('220 ')) {
      step = 'ehlo';
      socket.write('EHLO testclient\r\n');
      dataBuffer = '';
    } else if (step === 'ehlo' && dataBuffer.includes('250')) {
      step = 'mail';
      // Domain with percentage-based DMARC policy
      socket.write('MAIL FROM:<test@dmarc-pct.example.com>\r\n');
      dataBuffer = '';
    } else if (step === 'mail' && dataBuffer.includes('250')) {
      step = 'rcpt';
      socket.write('RCPT TO:<recipient@example.com>\r\n');
      dataBuffer = '';
    } else if (step === 'rcpt' && dataBuffer.includes('250')) {
      step = 'data';
      socket.write('DATA\r\n');
      dataBuffer = '';
    } else if (step === 'data' && dataBuffer.includes('354')) {
      const email = [
        `From: test@dmarc-pct.example.com`,
        `To: recipient@example.com`,
        `Subject: DMARC Percentage Test`,
        `Date: ${new Date().toUTCString()}`,
        `Message-ID: <dmarc-pct-${Date.now()}@example.com>`,
        '',
        'Testing DMARC with percentage-based policy application.',
        '.',
        ''
      ].join('\r\n');
      
      socket.write(email);
      dataBuffer = '';
    } else if (dataBuffer.includes('250 ') || dataBuffer.includes('550 ')) {
      const result = dataBuffer.includes('250') ? 'accepted' : 'rejected';
      console.log(`DMARC percentage policy: ${result} (may vary based on percentage)`);
      expect(true).toEqual(true);
      
      socket.write('QUIT\r\n');
      socket.end();
      done.resolve();
    }
  });
  
  socket.on('error', (err) => {
    console.error('Socket error:', err);
    done.reject(err);
  });
  
  await done.promise;
});

tap.test('cleanup - stop test server', async () => {
  await stopTestServer(testServer);
});

tap.start();