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# Copyright (C) 2019 Philipp Hörist <philipp AT hoerist.com>
#
# This file is part of the OpenPGP Gajim Plugin.
#
# OpenPGP Gajim Plugin 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; version 3 only.
#
# OpenPGP Gajim Plugin 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 OpenPGP Gajim Plugin. If not, see <http://www.gnu.org/licenses/>.
import os
import logging
from collections import namedtuple
import gnupg
from openpgp.modules.util import DecryptionFailed
log = logging.getLogger('gajim.p.openpgp.pygnupg')
if log.getEffectiveLevel() == logging.DEBUG:
log = logging.getLogger('gnupg')
log.addHandler(logging.StreamHandler())
log.setLevel(logging.DEBUG)
KeyringItem = namedtuple('KeyringItem', 'jid keyid fingerprint')
class PythonGnuPG(gnupg.GPG):
def __init__(self, jid, gnupghome):
gnupg.GPG.__init__(self, gpgbinary='gpg', gnupghome=str(gnupghome))
self._jid = jid.getBare()
self._own_fingerprint = None
@staticmethod
def _get_key_params(jid):
'''
Generate --gen-key input
'''
params = {
'Key-Type': 'RSA',
'Key-Length': 2048,
'Name-Real': 'xmpp:%s' % jid,
}
out = 'Key-Type: %s\n' % params.pop('Key-Type')
for key, val in list(params.items()):
out += '%s: %s\n' % (key, val)
out += '%no-protection\n'
out += '%commit\n'
return out
def generate_key(self):
super().gen_key(self._get_key_params(self._jid))
def encrypt(self, payload, keys):
recipients = [key.fingerprint for key in keys]
log.info('encrypt to:')
for fingerprint in recipients:
log.info(fingerprint)
result = super().encrypt(str(payload).encode('utf8'),
recipients,
armor=False,
sign=self._own_fingerprint,
always_trust=True)
if result.ok:
error = ''
else:
error = result.status
return result.data, error
def decrypt(self, payload):
result = super().decrypt(payload, always_trust=True)
if not result.ok:
raise DecryptionFailed(result.status)
return result.data.decode('utf8'), result.fingerprint
def get_key(self, fingerprint):
return super().list_keys(keys=[fingerprint])
def get_keys(self, secret=False):
result = super().list_keys(secret=secret)
keys = []
for key in result:
item = self._make_keyring_item(key)
if item is None:
continue
keys.append(self._make_keyring_item(key))
return keys
@staticmethod
def _make_keyring_item(key):
userid = key['uids'][0]
if not userid.startswith('xmpp:'):
log.warning('Incorrect userid: %s found for key, '
'key will be ignored', userid)
return
jid = userid[5:]
return KeyringItem(jid, key['keyid'], key['fingerprint'])
def import_key(self, data, jid):
log.info('Import key from %s', jid)
result = super().import_keys(data)
if not result:
log.error('Could not import key')
log.error(result)
return
if not self.validate_key(data, str(jid)):
return None
key = self.get_key(result.results[0]['fingerprint'])
return self._make_keyring_item(key[0])
def validate_key(self, public_key, jid):
import tempfile
temppath = os.path.join(tempfile.gettempdir(), 'temp_pubkey')
with open(temppath, 'wb') as tempfile:
tempfile.write(public_key)
result = self.scan_keys(temppath)
if result:
key_found = False
for uid in result.uids:
if uid.startswith('xmpp:'):
if uid[5:] == jid:
key_found = True
else:
log.warning('Found wrong userid in key: %s != %s',
uid[5:], jid)
log.debug(result)
os.remove(temppath)
return False
if not key_found:
log.warning('No valid userid found in key')
log.debug(result)
os.remove(temppath)
return False
log.info('Key validation succesful')
os.remove(temppath)
return True
log.warning('Invalid key data: %s')
log.debug(result)
os.remove(temppath)
return False
def get_own_key_details(self):
result = super().list_keys(secret=True)
if not result:
return None, None
if len(result) > 1:
log.error('More than one secret key found')
return None, None
self._own_fingerprint = result[0]['fingerprint']
return self._own_fingerprint, int(result[0]['date'])
def export_key(self, fingerprint):
key = super().export_keys(
fingerprint, secret=False, armor=False, minimal=True)
return key
def delete_key(self, fingerprint):
log.info('Delete Key: %s', fingerprint)
super().delete_keys(fingerprint)
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