Permalink
Find file Copy path
Fetching contributors…
Cannot retrieve contributors at this time
executable file 132 lines (118 sloc) 4.59 KB
#!/usr/bin/python3
#
# The Qubes OS Project, http://www.qubes-os.org
#
# Copyright (C) 2010 Rafal Wojtczuk <rafal@invisiblethingslab.com>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
import os
import os.path
import re
import sys
import subprocess
import shutil
import grp
import qubesadmin
updates_dir = "/var/lib/qubes/updates"
updates_rpm_dir = updates_dir + "/rpm"
updates_repodata_dir = updates_dir + "/repodata"
updates_error_file = updates_dir + "/errors"
updates_error_file_handle = None
comps_file = None
if os.path.exists('/usr/share/qubes/Qubes-comps.xml'):
comps_file = '/usr/share/qubes/Qubes-comps.xml'
package_regex = re.compile(r"^[A-Za-z0-9._+-]{1,128}.rpm$")
# example valid outputs:
# .....rpm: rsa sha1 (md5) pgp md5 OK
# .....rpm: (sha1) dsa sha1 md5 gpg OK
# example INVALID outputs:
# .....rpm: sha1 md5 OK
# .....rpm: RSA sha1 ((MD5) PGP) md5 NOT OK (MISSING KEYS: (MD5) PGP#246110c1)
gpg_ok_regex = re.compile(r": [a-z0-9() ]* (pgp|gpg) [a-z0-9 ]*OK$")
def dom0updates_fatal(pkg, msg):
global updates_error_file_handle
print(msg, file=sys.stderr)
if updates_error_file_handle is None:
updates_error_file_handle = open(updates_error_file, "a")
updates_error_file_handle.write(msg + "\n")
os.remove(pkg)
def handle_dom0updates(updatevm):
global updates_error_file_handle
source = os.getenv("QREXEC_REMOTE_DOMAIN")
if source != updatevm.name:
print('Domain ' + str(source) + ' not allowed to send dom0 updates',
file=sys.stderr)
exit(1)
# Clean old packages
if os.path.exists(updates_rpm_dir):
shutil.rmtree(updates_rpm_dir)
if os.path.exists(updates_repodata_dir):
shutil.rmtree(updates_repodata_dir)
if os.path.exists(updates_error_file):
os.remove(updates_error_file)
os.environ['LC_ALL'] = 'C'
qubes_gid = grp.getgrnam('qubes').gr_gid
old_umask = os.umask(0o002)
os.mkdir(updates_rpm_dir)
os.chown(updates_rpm_dir, -1, qubes_gid)
os.chmod(updates_rpm_dir, 0o0775)
subprocess.check_call(["/usr/libexec/qubes/qfile-dom0-unpacker",
str(os.getuid()), updates_rpm_dir])
# Verify received files
for untrusted_f in os.listdir(updates_rpm_dir):
if not package_regex.match(untrusted_f):
dom0updates_fatal(updates_rpm_dir + '/' + untrusted_f,
'Domain ' + source + ' sent unexpected file: ' + untrusted_f)
else:
f = untrusted_f
assert '/' not in f
assert '\0' not in f
assert '\x1b' not in f
full_path = updates_rpm_dir + "/" + f
if os.path.islink(full_path) or not os.path.isfile(full_path):
dom0updates_fatal(
full_path, 'Domain ' + source + ' sent not regular file')
p = subprocess.Popen(["/bin/rpm", "-K", full_path],
stdout=subprocess.PIPE)
output = p.communicate()[0].decode('ascii')
if p.returncode != 0:
dom0updates_fatal(full_path,
'Error while verifing %s signature: %s' % (f, output))
if not gpg_ok_regex.search(output.strip()):
dom0updates_fatal(full_path,
'Domain ' + source + ' sent not signed rpm: ' + f)
if updates_error_file_handle is not None:
updates_error_file_handle.close()
# After updates received - create repo metadata
createrepo_cmd = ["/usr/bin/createrepo_c"]
if comps_file:
createrepo_cmd += ["-g", comps_file]
createrepo_cmd += ["-q", updates_dir]
subprocess.check_call(createrepo_cmd)
os.chown(updates_repodata_dir, -1, qubes_gid)
os.chmod(updates_repodata_dir, 0o0775)
# Clean old cache
subprocess.call(["sudo", "/usr/bin/yum", "-q", "clean", "all"],
stdout=sys.stderr)
os.umask(old_umask)
exit(0)
def main():
app = qubesadmin.Qubes()
updatevm = app.updatevm
if updatevm is None:
exit(1)
handle_dom0updates(updatevm)
main()