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# crypto.py
# Keys and signatures.
#
# Copyright (C) 2014 Red Hat, Inc.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# the GNU General Public License v.2, or (at your option) any later version.
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY expressed or implied, including the implied warranties 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. Any Red Hat trademarks that are incorporated in the
# source code or documentation are not subject to the GNU General Public
# License and may only be used or replicated with the express permission of
# Red Hat, Inc.
#
from __future__ import print_function
from __future__ import absolute_import
from __future__ import unicode_literals
from dnf.i18n import _
import contextlib
import dnf.pycomp
import dnf.util
import dnf.yum.misc
import io
import logging
import os
import tempfile
try:
from gpg import Context
from gpg import Data
except ImportError:
import gpgme
class Context(object):
def __init__(self):
self.__dict__["ctx"] = gpgme.Context()
def __enter__(self):
return self
def __exit__(self, type, value, tb):
pass
@property
def armor(self):
return self.ctx.armor
@armor.setter
def armor(self, value):
self.ctx.armor = value
def op_import(self, key_fo):
if isinstance(key_fo, basestring):
key_fo = io.BytesIO(key_fo)
self.ctx.import_(key_fo)
def op_export(self, pattern, mode, keydata):
self.ctx.export(pattern, keydata)
def __getattr__(self, name):
return getattr(self.ctx, name)
class Data(object):
def __init__(self):
self.__dict__["buf"] = io.BytesIO()
def __enter__(self):
return self
def __exit__(self, type, value, tb):
pass
def read(self):
return self.buf.getvalue()
def __getattr__(self, name):
return getattr(self.buf, name)
GPG_HOME_ENV = 'GNUPGHOME'
logger = logging.getLogger('dnf')
def _extract_signing_subkey(key):
return dnf.util.first(subkey for subkey in key.subkeys if subkey.can_sign)
def _printable_fingerprint(fpr_hex):
segments = (fpr_hex[i:i + 4] for i in range(0, len(fpr_hex), 4))
return " ".join(segments)
def import_repo_keys(repo):
gpgdir = repo._pubring_dir
known_keys = keyids_from_pubring(gpgdir)
for keyurl in repo.gpgkey:
for keyinfo in retrieve(keyurl, repo):
keyid = keyinfo.id_
if keyid in known_keys:
logger.debug(_('repo %s: 0x%s already imported'), repo.id, keyid)
continue
if not repo._key_import._confirm(keyinfo):
continue
dnf.yum.misc.import_key_to_pubring(
keyinfo.raw_key, keyinfo.short_id, gpgdir=gpgdir,
make_ro_copy=False)
logger.debug(_('repo %s: imported key 0x%s.'), repo.id, keyid)
def keyids_from_pubring(gpgdir):
if not os.path.exists(gpgdir):
return []
with pubring_dir(gpgdir), Context() as ctx:
keyids = []
for k in ctx.keylist():
subkey = _extract_signing_subkey(k)
if subkey is not None:
keyids.append(subkey.keyid)
return keyids
def log_key_import(keyinfo):
msg = (_('Importing GPG key 0x%s:\n'
' Userid : "%s"\n'
' Fingerprint: %s\n'
' From : %s') %
(keyinfo.short_id, keyinfo.userid,
_printable_fingerprint(keyinfo.fingerprint),
keyinfo.url.replace("file://", "")))
logger.critical("%s", msg)
def log_dns_key_import(keyinfo, dns_result):
log_key_import(keyinfo)
if dns_result == dnf.dnssec.Validity.VALID:
logger.critical(_('Verified using DNS record with DNSSEC signature.'))
else:
logger.critical(_('NOT verified using DNS record.'))
@contextlib.contextmanager
def pubring_dir(pubring_dir):
orig = os.environ.get(GPG_HOME_ENV, None)
os.environ[GPG_HOME_ENV] = pubring_dir
try:
yield
finally:
if orig is None:
del os.environ[GPG_HOME_ENV]
else:
os.environ[GPG_HOME_ENV] = orig
def rawkey2infos(key_fo):
pb_dir = tempfile.mkdtemp()
keyinfos = []
with pubring_dir(pb_dir), Context() as ctx:
ctx.op_import(key_fo)
for key in ctx.keylist():
subkey = _extract_signing_subkey(key)
if subkey is None:
continue
keyinfos.append(Key(key, subkey))
ctx.armor = True
for info in keyinfos:
with Data() as sink:
ctx.op_export(info.id_, 0, sink)
sink.seek(0, os.SEEK_SET)
info.raw_key = sink.read()
dnf.util.rm_rf(pb_dir)
return keyinfos
def retrieve(keyurl, repo=None):
if keyurl.startswith('http:'):
logger.warning(_("retrieving repo key for %s unencrypted from %s"), repo.id, keyurl)
with dnf.util._urlopen(keyurl, repo=repo) as handle:
keyinfos = rawkey2infos(handle)
for keyinfo in keyinfos:
keyinfo.url = keyurl
return keyinfos
class Key(object):
def __init__(self, key, subkey):
self.id_ = subkey.keyid
self.fingerprint = subkey.fpr
self.raw_key = None
self.timestamp = subkey.timestamp
self.url = None
self.userid = key.uids[0].uid
@property
def short_id(self):
rj = '0' if dnf.pycomp.PY3 else b'0'
return self.id_[-8:].rjust(8, rj)
@property
def rpm_id(self):
return self.short_id.lower()