148 lines
5.5 KiB
Python
148 lines
5.5 KiB
Python
# Copyright (C) 2003-2014 Yann Leboulanger <asterix AT lagaule.org>
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# Copyright (C) 2005 Alex Mauer <hawke AT hawkesnest.net>
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# Copyright (C) 2005-2006 Nikos Kouremenos <kourem AT gmail.com>
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# Copyright (C) 2007 Stephan Erb <steve-e AT h3c.de>
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# Copyright (C) 2008 Jean-Marie Traissard <jim AT lapin.org>
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# Jonathan Schleifer <js-gajim AT webkeks.org>
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#
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# This file is part of Gajim.
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#
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# Gajim is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published
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# by the Free Software Foundation; version 3 only.
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#
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# Gajim is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Gajim. If not, see <http://www.gnu.org/licenses/>.
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import os
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import logging
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from gajim.common import app
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if app.is_installed('GPG'):
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import gnupg
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class GnuPG(gnupg.GPG):
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def __init__(self):
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use_agent = app.config.get('use_gpg_agent')
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gnupg.GPG.__init__(self, gpgbinary=app.get_gpg_binary(), use_agent=use_agent)
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encoding = app.config.get('pgp_encoding')
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if encoding:
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self.encoding = encoding
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self.decode_errors = 'replace'
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self.passphrase = None
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self.always_trust = [] # list of keyID to always trust
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def encrypt(self, str_, recipients, always_trust=False):
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trust = always_trust
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if not trust:
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# check if we trust all keys
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trust = True
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for key in recipients:
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if key not in self.always_trust:
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trust = False
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if not trust:
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# check that we'll be able to encrypt
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result = super(GnuPG, self).list_keys(keys=recipients)
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for key in result:
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if key['trust'] not in ('f', 'u'):
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if key['keyid'][-8:] not in self.always_trust:
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return '', 'NOT_TRUSTED ' + key['keyid'][-8:]
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trust = True
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result = super(GnuPG, self).encrypt(str_.encode('utf8'), recipients,
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always_trust=trust, passphrase=self.passphrase)
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if result.ok:
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error = ''
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else:
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error = result.status
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return self._stripHeaderFooter(str(result)), error
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def decrypt(self, str_, keyID):
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data = self._addHeaderFooter(str_, 'MESSAGE')
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result = super(GnuPG, self).decrypt(data.encode('utf8'),
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passphrase=self.passphrase)
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return result.data.decode('utf8')
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def sign(self, str_, keyID):
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result = super(GnuPG, self).sign(str_.encode('utf8'), keyid=keyID, detach=True,
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passphrase=self.passphrase)
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if result.fingerprint:
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return self._stripHeaderFooter(str(result))
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if hasattr(result, 'status') and result.status == 'key expired':
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return 'KEYEXPIRED'
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return 'BAD_PASSPHRASE'
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def verify(self, str_, sign):
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if str_ is None:
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return ''
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# Hash algorithm is not transfered in the signed presence stanza so try
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# all algorithms. Text name for hash algorithms from RFC 4880 - section 9.4
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hash_algorithms = ['SHA512', 'SHA384', 'SHA256', 'SHA224', 'SHA1', 'RIPEMD160']
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for algo in hash_algorithms:
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data = os.linesep.join(
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['-----BEGIN PGP SIGNED MESSAGE-----',
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'Hash: ' + algo,
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'',
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str_,
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self._addHeaderFooter(sign, 'SIGNATURE')]
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)
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result = super(GnuPG, self).verify(data.encode('utf8'))
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if result.valid:
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return result.key_id
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return ''
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def get_key(self, keyID):
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return super(GnuPG, self).list_keys(keys=[keyID])
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def get_keys(self, secret=False):
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keys = {}
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result = super(GnuPG, self).list_keys(secret=secret)
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for key in result:
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# Take first not empty uid
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keys[key['keyid'][8:]] = [uid for uid in key['uids'] if uid][0]
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return keys
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def get_secret_keys(self):
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return self.get_keys(True)
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def _stripHeaderFooter(self, data):
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"""
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Remove header and footer from data
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"""
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if not data:
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return ''
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lines = data.splitlines()
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while lines[0] != '':
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lines.remove(lines[0])
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while lines[0] == '':
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lines.remove(lines[0])
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i = 0
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for line in lines:
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if line:
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if line[0] == '-':
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break
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i = i+1
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line = '\n'.join(lines[0:i])
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return line
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def _addHeaderFooter(self, data, type_):
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"""
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Add header and footer from data
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"""
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out = "-----BEGIN PGP %s-----" % type_ + os.linesep
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out = out + "Version: PGP" + os.linesep
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out = out + os.linesep
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out = out + data + os.linesep
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out = out + "-----END PGP %s-----" % type_ + os.linesep
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return out
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