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