gajim-plural/gajim/common/gpg.py

148 lines
5.5 KiB
Python

# Copyright (C) 2003-2014 Yann Leboulanger <asterix AT lagaule.org>
# Copyright (C) 2005 Alex Mauer <hawke AT hawkesnest.net>
# Copyright (C) 2005-2006 Nikos Kouremenos <kourem AT gmail.com>
# Copyright (C) 2007 Stephan Erb <steve-e AT h3c.de>
# Copyright (C) 2008 Jean-Marie Traissard <jim AT lapin.org>
# Jonathan Schleifer <js-gajim AT webkeks.org>
#
# This file is part of Gajim.
#
# Gajim 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.
#
# Gajim 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 Gajim. If not, see <http://www.gnu.org/licenses/>.
import os
import logging
from gajim.common import app
if app.is_installed('GPG'):
import gnupg
class GnuPG(gnupg.GPG):
def __init__(self):
use_agent = app.config.get('use_gpg_agent')
gnupg.GPG.__init__(self, gpgbinary=app.get_gpg_binary(), use_agent=use_agent)
encoding = app.config.get('pgp_encoding')
if encoding:
self.encoding = encoding
self.decode_errors = 'replace'
self.passphrase = None
self.always_trust = [] # list of keyID to always trust
def encrypt(self, str_, recipients, always_trust=False):
trust = always_trust
if not trust:
# check if we trust all keys
trust = True
for key in recipients:
if key not in self.always_trust:
trust = False
if not trust:
# check that we'll be able to encrypt
result = super(GnuPG, self).list_keys(keys=recipients)
for key in result:
if key['trust'] not in ('f', 'u'):
if key['keyid'][-8:] not in self.always_trust:
return '', 'NOT_TRUSTED ' + key['keyid'][-8:]
trust = True
result = super(GnuPG, self).encrypt(str_.encode('utf8'), recipients,
always_trust=trust, passphrase=self.passphrase)
if result.ok:
error = ''
else:
error = result.status
return self._stripHeaderFooter(str(result)), error
def decrypt(self, str_, keyID):
data = self._addHeaderFooter(str_, 'MESSAGE')
result = super(GnuPG, self).decrypt(data.encode('utf8'),
passphrase=self.passphrase)
return result.data.decode('utf8')
def sign(self, str_, keyID):
result = super(GnuPG, self).sign(str_.encode('utf8'), keyid=keyID, detach=True,
passphrase=self.passphrase)
if result.fingerprint:
return self._stripHeaderFooter(str(result))
if hasattr(result, 'status') and result.status == 'key expired':
return 'KEYEXPIRED'
return 'BAD_PASSPHRASE'
def verify(self, str_, sign):
if str_ is None:
return ''
# Hash algorithm is not transfered in the signed presence stanza so try
# all algorithms. Text name for hash algorithms from RFC 4880 - section 9.4
hash_algorithms = ['SHA512', 'SHA384', 'SHA256', 'SHA224', 'SHA1', 'RIPEMD160']
for algo in hash_algorithms:
data = os.linesep.join(
['-----BEGIN PGP SIGNED MESSAGE-----',
'Hash: ' + algo,
'',
str_,
self._addHeaderFooter(sign, 'SIGNATURE')]
)
result = super(GnuPG, self).verify(data.encode('utf8'))
if result.valid:
return result.key_id
return ''
def get_key(self, keyID):
return super(GnuPG, self).list_keys(keys=[keyID])
def get_keys(self, secret=False):
keys = {}
result = super(GnuPG, self).list_keys(secret=secret)
for key in result:
# Take first not empty uid
keys[key['keyid'][8:]] = [uid for uid in key['uids'] if uid][0]
return keys
def get_secret_keys(self):
return self.get_keys(True)
def _stripHeaderFooter(self, data):
"""
Remove header and footer from data
"""
if not data:
return ''
lines = data.splitlines()
while lines[0] != '':
lines.remove(lines[0])
while lines[0] == '':
lines.remove(lines[0])
i = 0
for line in lines:
if line:
if line[0] == '-':
break
i = i+1
line = '\n'.join(lines[0:i])
return line
def _addHeaderFooter(self, data, type_):
"""
Add header and footer from data
"""
out = "-----BEGIN PGP %s-----" % type_ + os.linesep
out = out + "Version: PGP" + os.linesep
out = out + os.linesep
out = out + data + os.linesep
out = out + "-----END PGP %s-----" % type_ + os.linesep
return out