#!/usr/bin/env python3 import argparse import datetime import enum import math import os import shutil import subprocess import sys import tempfile import time import dnf import qubesadmin import qubesadmin.tools import rpm import tqdm import xdg.BaseDirectory PATH_PREFIX = '/var/lib/qubes/vm-templates' TEMP_DIR = '/var/tmp' PACKAGE_NAME_PREFIX = 'qubes-template-' CACHE_DIR = os.path.join(xdg.BaseDirectory.xdg_cache_home, 'qvm-template') def qubes_release(): if os.path.exists('/usr/share/qubes/marker-vm'): with open('/usr/share/qubes/marker-vm', 'r') as f: # Get last line (in the format `x.x`) return f.readlines()[-1].strip() return subprocess.check_output(['lsb_release', '-sr'], encoding='UTF-8').strip() parser = argparse.ArgumentParser(description='Qubes Template Manager') parser.add_argument('operation', type=str) parser.add_argument('templates', nargs='*') # qrexec related parser.add_argument('--repo-files', action='append', default=['/etc/yum.repos.d/qubes-templates.repo'], help='Specify files containing DNF repository configuration.') parser.add_argument('--updatevm', default='sys-firewall', help='Specify VM to download updates from.') # DNF-related options parser.add_argument('--enablerepo', action='append', help='Enable additional repositories.') parser.add_argument('--disablerepo', action='append', help='Disable certain repositories.') parser.add_argument('--repoid', action='append', help='Enable just specific repositories.') parser.add_argument('--releasever', default=qubes_release(), help='Override distro release version.') parser.add_argument('--cachedir', default=CACHE_DIR, help='Override cache directory.') # qvm-template install parser.add_argument('--nogpgcheck', action='store_true', help='Disable signature checks.') parser.add_argument('--allow-pv', action='store_true', help='Allow setting virt_mode to pv in configuration file.') # qvm-template download parser.add_argument('--downloaddir', default='.', help='Override download directory.') # qvm-template list parser.add_argument('--all', action='store_true') parser.add_argument('--installed', action='store_true') parser.add_argument('--available', action='store_true') parser.add_argument('--extras', action='store_true') parser.add_argument('--upgrades', action='store_true') class TemplateState(enum.Enum): INSTALLED = 'installed' AVAILABLE = 'available' EXTRA = 'extra' UPGRADABLE = 'upgradable' # NOTE: Verifying RPMs this way is prone to TOCTOU. This is okay for local # files, but may create problems if multiple instances of `qvm-template` are # downloading the same file, so a lock is needed in that case. def verify_rpm(path, nogpgcheck=False, transaction_set=None): if transaction_set is None: transaction_set = rpm.TransactionSet() with open(path, 'rb') as f: try: hdr = transaction_set.hdrFromFdno(f) if hdr[rpm.RPMTAG_SIGSIZE] is None \ and hdr[rpm.RPMTAG_SIGPGP] is None \ and hdr[rpm.RPMTAG_SIGGPG] is None: return nogpgcheck except rpm.error as e: if str(e) == 'public key not trusted' \ or str(e) == 'public key not available': return nogpgcheck return False return True def get_package_hdr(path, transaction_set=None): if transaction_set is None: transaction_set = rpm.TransactionSet() with open(path, 'rb') as f: hdr = transaction_set.hdrFromFdno(f) return hdr def extract_rpm(name, path, target): rpm2cpio = subprocess.Popen(['rpm2cpio', path], stdout=subprocess.PIPE) # `-D` is GNUism cpio = subprocess.Popen([ 'cpio', '-idm', '-D', target, '.%s/%s/*' % (PATH_PREFIX, name) ], stdin=rpm2cpio.stdout, stdout=subprocess.DEVNULL) return rpm2cpio.wait() == 0 and cpio.wait() == 0 def parse_config(path): with open(path, 'r') as f: return dict(line.rstrip('\n').split('=', 1) for line in f) def install(args, app): # TODO: Lock, mentioned in the note above transaction_set = rpm.TransactionSet() rpm_list = [] for template in args.templates: if template.endswith('.rpm'): if not os.path.exists(template): parser.error('RPM file \'%s\' not found.' % template) rpm_list.append(template) os.makedirs(args.cachedir, exist_ok=True) dl_list = get_dl_list(args, app) dl_list_copy = dl_list.copy() # Verify that the templates are not yet installed for name, (ver, _) in dl_list.items(): if name in app.domains: print(('Template \'%s\' already installed, skipping...' ' (You may want to use the {reinstall,upgrade,downgrade}' ' operations.)') % name, file=sys.stderr) del dl_list_copy[name] else: version_str = build_version_str(ver) target_file = \ '%s%s-%s.rpm' % (PACKAGE_NAME_PREFIX, name, version_str) rpm_list.append(os.path.join(args.cachedir, target_file)) dl_list = dl_list_copy download(args, app, path_override=args.cachedir, dl_list=dl_list) for rpmfile in rpm_list: if not verify_rpm(rpmfile, args.nogpgcheck, transaction_set): parser.error('Package \'%s\' verification failed.' % template) for rpmfile in rpm_list: with tempfile.TemporaryDirectory(dir=TEMP_DIR) as target: package_hdr = get_package_hdr(rpmfile) package_name = package_hdr[rpm.RPMTAG_NAME] if not package_name.startswith(PACKAGE_NAME_PREFIX): parser.error( 'Illegal package name for package \'%s\'.' % rpmfile) # Remove prefix to get the real template name name = package_name[len(PACKAGE_NAME_PREFIX):] # Another check for already-downloaded RPMs if name in app.domains: print(('Template \'%s\' already installed, skipping...' ' (You may want to use the {reinstall,upgrade,downgrade}' ' operations.)') % name, file=sys.stderr) continue print('Installing template \'%s\'...' % name, file=sys.stderr) extract_rpm(name, rpmfile, target) cmdline = [ 'qvm-template-postprocess', '--really', '--no-installed-by-rpm', ] if args.allow_pv: cmdline.append('--allow-pv') subprocess.check_call(cmdline + [ 'post-install', name, target + PATH_PREFIX + '/' + name]) app.domains.refresh_cache(force=True) tpl = app.domains[name] tpl.features['template-epoch'] = \ package_hdr[rpm.RPMTAG_EPOCHNUM] tpl.features['template-version'] = \ package_hdr[rpm.RPMTAG_VERSION] tpl.features['template-release'] = \ package_hdr[rpm.RPMTAG_RELEASE] tpl.features['template-install-date'] = \ str(datetime.datetime.today()) tpl.features['template-name'] = name # TODO: Store source repo def qrexec_popen(args, app, service, stdout=subprocess.PIPE, filter_esc=True): if args.updatevm: return app.domains[args.updatevm].run_service( service, filter_esc=filter_esc, stdout=stdout) else: return subprocess.Popen([ '/etc/qubes-rpc/%s' % service, ], stdin=subprocess.PIPE, stdout=stdout, stderr=subprocess.PIPE) def qrexec_payload(args, app, spec): payload = '' for r in args.enablerepo if args.enablerepo else []: payload += '--enablerepo=%s\n' % r for r in args.disablerepo if args.disablerepo else []: payload += '--disablerepo=%s\n' % r for r in args.repoid if args.repoid else []: payload += '--repoid=%s\n' % r payload += '--releasever=%s\n' % args.releasever payload += spec + '\n' payload += '---\n' for fn in args.repo_files: with open(fn, 'r') as f: payload += f.read() + '\n' return payload def qrexec_repoquery(args, app, spec='*'): proc = qrexec_popen(args, app, 'qubes.TemplateSearch') payload = qrexec_payload(args, app, spec) stdout, stderr = proc.communicate(payload.encode('UTF-8')) stdout = stdout.decode('ASCII') if proc.wait() != 0: return None result = [] for line in stdout.strip().split('\n'): entry = line.split(':') if not entry[0].startswith(PACKAGE_NAME_PREFIX): continue entry[0] = entry[0][len(PACKAGE_NAME_PREFIX):] result.append(entry) return result def qrexec_download(args, app, spec, path, dlsize=None): with open(path, 'wb') as f: # Don't filter ESCs for binary files proc = qrexec_popen(args, app, 'qubes.TemplateDownload', stdout=f, filter_esc=False) payload = qrexec_payload(args, app, spec) proc.stdin.write(payload.encode('UTF-8')) proc.stdin.close() with tqdm.tqdm(desc=spec, total=dlsize, unit_scale=True, unit_divisor=1000, unit='B') as pbar: last = 0 while proc.poll() == None: cur = f.tell() pbar.update(cur - last) last = cur time.sleep(0.1) if proc.wait() != 0: return False return True def build_version_str(evr): return '%s:%s-%s' % evr def do_list(args, app): # TODO: Check local template name actually matches to account for renames # TODO: Also display repo like `dnf list` tpl_list = [] if not (args.installed or args.available or args.extras or args.upgrades): args.all = True if args.all or args.available or args.extras or args.upgrades: query_res = qrexec_repoquery(args, app) if args.installed or args.all: for vm in app.domains: if 'template-install-date' in vm.features: version_str = build_version_str(( vm.features['template-epoch'], vm.features['template-version'], vm.features['template-release'])) tpl_list.append( (vm.name, version_str, TemplateState.INSTALLED.value)) if args.available or args.all: for name, epoch, version, release, reponame, dlsize, summary \ in query_res: version_str = build_version_str((epoch, version, release)) tpl_list.append((name, version_str, TemplateState.AVAILABLE.value)) if args.extras: remote = set() for name, epoch, version, release, reponame, dlsize, summary \ in query_res: remote.add(name) for vm in app.domains: if 'template-name' in vm.features and \ vm.features['template-name'] not in remote: version_str = build_version_str(( vm.features['template-epoch'], vm.features['template-version'], vm.features['template-release'])) tpl_list.append( (vm.name, version_str, TemplateState.EXTRA.value)) if args.upgrades: local = {} for vm in app.domains: if 'template-name' in vm.features: local[vm.features['template-name']] = ( vm.features['template-epoch'], vm.features['template-version'], vm.features['template-release']) for name, epoch, version, release, reponame, dlsize, summary \ in query_res: if name in local: if rpm.labelCompare(local[name], (epoch, version, release)) < 0: version_str = build_version_str((epoch, version, release)) tpl_list.append( (name, version_str, TemplateState.UPGRADABLE.value)) qubesadmin.tools.print_table(tpl_list) def get_dl_list(args, app): candid = {} for template in args.templates: # Skip local RPMs if template.endswith('.rpm'): continue query_res = qrexec_repoquery(args, app, PACKAGE_NAME_PREFIX + template) if len(query_res) == 0: parser.error('Package \'%s\' not found.' % template) # TODO: Better error handling sys.exit(1) # We only select one (latest) package for each distinct package name for name, epoch, version, release, reponame, dlsize, summary \ in query_res: ver = (epoch, version, release) if name not in candid or rpm.labelCompare(candid[name], ver) < 0: candid[name] = (ver, int(dlsize)) return candid def download(args, app, path_override=None, dl_list=None): if dl_list is None: dl_list = get_dl_list(args, app) path = path_override if path_override != None else args.downloaddir for name, (ver, dlsize) in dl_list.items(): version_str = build_version_str(ver) spec = PACKAGE_NAME_PREFIX + name + '-' + version_str target = os.path.join(path, '%s.rpm' % spec) if os.path.exists(target): print('\'%s\' already exists, skipping...' % target, file=sys.stderr) else: print('Downloading \'%s\'...' % spec, file=sys.stderr) ret = qrexec_download(args, app, spec, target, dlsize) if not ret: # TODO: Retry? print('\'%s\' download failed.' % spec, file=sys.stderr) sys.exit(1) def remove(args, app): # Use exec so stdio can be shared easily os.execvp('qvm-remove', ['qvm-remove'] + args.templates) def clean(args, app): # TODO: More fine-grained options shutil.rmtree(args.cachedir) def main(args=None, app=None): args = parser.parse_args(args) if app is None: app = qubesadmin.Qubes() if args.operation == 'install': install(args, app) elif args.operation == 'list': do_list(args, app) elif args.operation == 'download': download(args, app) elif args.operation == 'remove': remove(args, app) elif args.operation == 'clean': clean(args, app) else: parser.error('Operation \'%s\' not supported.' % args.operation) return 0 if __name__ == '__main__': sys.exit(main())