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# 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 Library 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.
# Copyright 2003 Duke University
from __future__ import print_function, absolute_import, unicode_literals
import os
import subprocess
import logging
from shutil import which
from dnf.i18n import _
_logger = logging.getLogger('dnf')
_rpmkeys_binary = None
def _find_rpmkeys_binary():
global _rpmkeys_binary
if _rpmkeys_binary is None:
_rpmkeys_binary = which("rpmkeys")
_logger.debug(_('Using rpmkeys executable at %s to verify signatures'),
_rpmkeys_binary)
return _rpmkeys_binary
def _process_rpm_output(data):
# No signatures or digests = corrupt package.
# There is at least one line for -: and another (empty) entry after the
# last newline.
if len(data) < 3 or data[0] != b'-:' or data[-1]:
return 2
seen_sig, missing_key, not_trusted, not_signed = False, False, False, False
for i in data[1:-1]:
if b': BAD' in i:
return 2
elif i.endswith(b': NOKEY'):
missing_key = True
elif i.endswith(b': NOTTRUSTED'):
not_trusted = True
elif i.endswith(b': NOTFOUND'):
not_signed = True
elif not i.endswith(b': OK'):
return 2
if not_trusted:
return 3
elif missing_key:
return 1
elif not_signed:
return 4
# we still check return code, so this is safe
return 0
def _verifyPackageUsingRpmkeys(package, installroot):
rpmkeys_binary = _find_rpmkeys_binary()
if rpmkeys_binary is None or not os.path.isfile(rpmkeys_binary):
_logger.critical(_('Cannot find rpmkeys executable to verify signatures.'))
return 2
# "--define=_pkgverify_level signature" enforces signature checking;
# "--define=_pkgverify_flags 0x0" ensures that all signatures are checked.
args = ('rpmkeys', '--checksig', '--root', installroot, '--verbose',
'--define=_pkgverify_level signature', '--define=_pkgverify_flags 0x0',
'-')
with subprocess.Popen(
args=args,
executable=rpmkeys_binary,
env={'LC_ALL': 'C'},
stdout=subprocess.PIPE,
cwd='/',
stdin=package) as p:
data = p.communicate()[0]
returncode = p.returncode
if type(returncode) is not int:
raise AssertionError('Popen set return code to non-int')
# rpmkeys can return something other than 0 or 1 in the case of a
# fatal error (OOM, abort() called, SIGSEGV, etc)
if returncode >= 2 or returncode < 0:
return 2
ret = _process_rpm_output(data.split(b'\n'))
if ret:
return ret
return 2 if returncode else 0
def checkSig(ts, package):
"""Takes a transaction set and a package, check it's sigs,
return 0 if they are all fine
return 1 if the gpg key can't be found
return 2 if the header is in someway damaged
return 3 if the key is not trusted
return 4 if the pkg is not gpg or pgp signed"""
fdno = os.open(package, os.O_RDONLY|os.O_NOCTTY|os.O_CLOEXEC)
try:
value = _verifyPackageUsingRpmkeys(fdno, ts.ts.rootDir)
finally:
os.close(fdno)
return value