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EDIT :: miscutils.py

# 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

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