"""在 47 服务器创建空数据副本并进行受限验收，不停止线上服务或删除文件。""" import argparse import hashlib import json import os from pathlib import Path import shutil import sqlite3 import subprocess import time def run(*args): return subprocess.check_output(args, text=True).strip() def service_state(): return {name: run('systemctl', 'show', name, '--property=MainPID,NRestarts,ActiveState') for name in ('smail.service', 'mysql.service', 'Scert.service')} def main(): parser = argparse.ArgumentParser() parser.add_argument('--main-sha', required=True) parser.add_argument('--binary', type=Path, default=Path('/opt/smail/smail')) args = parser.parse_args() assert os.geteuid() == 0 and run('hostname') == 'ikun2' os.umask(0o027) live = Path('/opt/smail') binary = args.binary.resolve(strict=True) assert binary == args.binary and binary.is_file() if binary != live / 'smail': assert binary.parent.parent == Path('/var/tmp') and binary.parent.name.startswith('smail-review-') assert binary.stat().st_uid == 0 and binary.stat().st_mode & 0o022 == 0 assert binary.parent.stat().st_uid == 0 and binary.parent.stat().st_mode & 0o022 == 0 with binary.open('rb') as stream: assert hashlib.file_digest(stream, 'sha256').hexdigest() == args.main_sha stream.seek(0) header = stream.read(20) assert header[:5] == b'\x7fELF\x02' and header[18:20] == b'\x3e\x00' with (live / 'smail').open('rb') as stream: live_sha = hashlib.file_digest(stream, 'sha256').hexdigest() memory = dict(line.split(':', 1) for line in Path('/proc/meminfo').read_text().splitlines()) assert int(memory['MemAvailable'].split()[0]) >= 272 * 1024, '可用内存不足，暂停隔离验收' stamp = time.strftime('%Y%m%d-%H%M%S') target = Path('/var/tmp') / ('smail-review-runtime-' + stamp) target.mkdir(mode=0o750) shutil.chown(target, user='smail', group='smail') root = target / 'instance' control = target / 'control' for directory in (root, control, root / 'ssl'): directory.mkdir(mode=0o750) shutil.chown(directory, user='smail', group='smail') shutil.copy2(binary, root / 'smail') (root / 'smail').chmod(0o755) shutil.copy2(Path(__file__).with_name('runtime_probe.py'), target / 'runtime_probe.py') subprocess.run(['openssl', 'req', '-x509', '-newkey', 'rsa:2048', '-nodes', '-days', '2', '-keyout', str(root / 'ssl/runtime.key'), '-out', str(root / 'ssl/runtime.crt'), '-subj', '/CN=mail.runtime.invalid', '-addext', 'subjectAltName=DNS:runtime.invalid,DNS:*.runtime.invalid'], check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL) for name in ('runtime.key', 'runtime.crt'): path = root / 'ssl' / name path.chmod(0o600) shutil.chown(path, user='smail', group='smail') assert not (root / 'data').exists() and not (root / 'config.json').exists() before = service_state() unit = 'smail-runtime-review-' + stamp probe_unit = 'smail-runtime-probe-' + stamp result = {'target': str(target), 'unit': unit, 'main_sha256': args.main_sha, 'source': str(binary), 'live_sha256': live_sha, 'before': before} started = time.strftime('%Y-%m-%dT%H:%M:%S') try: subprocess.run([ 'systemd-run', '--unit=' + unit, '--property=Type=exec', '--property=User=smail', '--property=Group=smail', '--property=PrivateNetwork=yes', '--property=PrivateTmp=yes', '--property=ProtectSystem=strict', '--property=ProtectHome=yes', '--property=NoNewPrivileges=yes', '--property=CapabilityBoundingSet=CAP_NET_BIND_SERVICE', '--property=AmbientCapabilities=CAP_NET_BIND_SERVICE', '--property=MemoryMax=128M', '--property=MemorySwapMax=0', '--property=CPUQuota=25%', '--property=TasksMax=128', '--property=RuntimeMaxSec=300s', '--property=OOMPolicy=stop', '--property=KillMode=control-group', '--property=TimeoutStopSec=10s', '--property=BindPaths=' + str(root) + ':/opt/smail ' + str(control) + ':/run/smail', '--property=ReadWritePaths=/opt/smail /run/smail', '--property=WorkingDirectory=/opt/smail', '--setenv=SMAIL_ROOT=/opt/smail', '--setenv=GOMEMLIMIT=64MiB', '--setenv=GOMAXPROCS=1', '/opt/smail/smail', ], check=True) pid = run('systemctl', 'show', unit, '--property=MainPID', '--value') assert pid != '0' live_net = str(Path('/proc/self/ns/net').readlink()) assert str(Path('/proc/' + pid + '/ns/net').readlink()) != live_net assert Path('/proc/' + pid + '/root/opt/smail/smail').stat().st_ino == (root / 'smail').stat().st_ino assert (root / 'smail').stat().st_ino != (live / 'smail').stat().st_ino probe = subprocess.run([ 'systemd-run', '--wait', '--pipe', '--unit=' + probe_unit, '--property=User=smail', '--property=Group=smail', '--property=NetworkNamespacePath=/proc/' + pid + '/ns/net', '--property=PrivateTmp=no', '--property=ProtectSystem=strict', '--property=ProtectHome=yes', '--property=NoNewPrivileges=yes', '--property=InaccessiblePaths=/opt/smail /run/smail', '--property=ReadWritePaths=' + str(target), '--property=MemoryMax=48M', '--property=MemorySwapMax=0', '--property=CPUQuota=25%', '--property=TasksMax=32', '--property=RuntimeMaxSec=240s', '--property=OOMPolicy=stop', '--property=KillMode=control-group', '--property=TimeoutStopSec=10s', 'python3', str(target / 'runtime_probe.py'), str(root), '--live-net', live_net, ], text=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, timeout=270) (target / 'probe.log').write_text(probe.stdout, encoding='utf-8') result['probe_code'] = probe.returncode if (target / 'probe-result.json').exists(): result['probe'] = json.loads((target / 'probe-result.json').read_text()) assert probe.returncode == 0, '隔离验收失败，请检查保留的 probe.log' assert result['probe']['passed'] with sqlite3.connect(f'file:{live / "data/smail.db"}?mode=ro', uri=True) as database: message_id = result['probe']['smtp']['message_id'] assert database.execute('SELECT COUNT(*) FROM email WHERE msg_id=?', (message_id,)).fetchone()[0] == 0 result['live_message_absent'] = True finally: result['resources'] = run('systemctl', 'show', unit, '--property=MemoryPeak,MemoryCurrent,Result,ExecMainStatus,NRestarts') subprocess.run(['systemctl', 'stop', unit], check=True) subprocess.run(['systemctl', 'stop', probe_unit], check=False, stderr=subprocess.DEVNULL) result['after'] = service_state() with (live / 'smail').open('rb') as stream: result['live_unchanged'] = (result['after'] == before and hashlib.file_digest(stream, 'sha256').hexdigest() == live_sha) result['integrity'] = {} for name in ('smail.db', 'smail-state.db'): path = root / 'data' / name if path.exists(): with sqlite3.connect(f'file:{path}?mode=ro', uri=True) as database: result['integrity'][name] = database.execute('PRAGMA integrity_check').fetchall() (target / 'service.log').write_text(run('journalctl', '-u', unit, '--no-pager'), encoding='utf-8') kernel = run('journalctl', '-k', '--since', started, '--no-pager') result['oom_events'] = sum('oom-kill:constraint=' in line for line in kernel.splitlines()) (target / 'result.json').write_text(json.dumps(result, ensure_ascii=False, indent=2), encoding='utf-8') print(json.dumps(result, ensure_ascii=False, indent=2)) assert result['live_unchanged'] and result['oom_events'] == 0 assert result['integrity'] == {'smail.db': [('ok',)], 'smail-state.db': [('ok',)]} if __name__ == '__main__': main()