150 lines
4.8 KiB
Python
150 lines
4.8 KiB
Python
# Copyright (C) 2019 Philipp Hörist <philipp AT hoerist.com>
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# 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 PGP Gajim Plugin.
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#
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# PGP Gajim Plugin 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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# PGP Gajim Plugin 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 PGP Gajim Plugin. If not, see <http://www.gnu.org/licenses/>.
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import logging
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import os
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from functools import lru_cache
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import gnupg
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from gajim.common.util.classes import Singleton
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from pgp.exceptions import SignError
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logger = logging.getLogger("gajim.p.pgplegacy")
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if logger.getEffectiveLevel() == logging.DEBUG:
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logger = logging.getLogger("gnupg")
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logger.addHandler(logging.StreamHandler())
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logger.setLevel(logging.DEBUG)
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class PGP(gnupg.GPG, metaclass=Singleton):
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def __init__(self, binary, encoding=None):
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super().__init__(gpgbinary=binary, use_agent=True)
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if encoding is not None:
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self.encoding = encoding
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self.decode_errors = "replace"
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def encrypt(self, payload, recipients, always_trust=False):
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if not always_trust:
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# check that we'll be able to encrypt
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result = self.get_key(recipients[0])
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for key in result:
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if key["trust"] not in ("f", "u"):
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return "", "NOT_TRUSTED " + key["keyid"][-8:]
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result = super().encrypt(
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payload.encode("utf8"), recipients, always_trust=always_trust
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)
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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._strip_header_footer(str(result)), error
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def decrypt(self, payload):
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data = self._add_header_footer(payload, "MESSAGE")
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result = super().decrypt(data.encode("utf8"))
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return result.data.decode("utf8")
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@lru_cache(maxsize=8)
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def sign(self, payload, key_id):
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if payload is None:
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payload = ""
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result = super().sign(payload.encode("utf8"), keyid=key_id, detach=True)
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if result.fingerprint:
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return self._strip_header_footer(str(result))
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raise SignError(result.status)
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def verify(self, payload, signed):
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# Hash algorithm is not transferred in the signed
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# presence stanza so try all algorithms.
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# Text name for hash algorithms from RFC 4880 - section 9.4
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if payload is None:
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payload = ""
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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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[
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"-----BEGIN PGP SIGNED MESSAGE-----",
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"Hash: " + algo,
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"",
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payload,
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self._add_header_footer(signed, "SIGNATURE"),
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]
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)
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result = super().verify(data.encode("utf8"))
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if result.valid:
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return result.fingerprint
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def get_key(self, key_id):
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return super().list_keys(keys=[key_id])
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def get_keys(self, secret=False):
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keys = {}
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result = super().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["fingerprint"]] = next(uid for uid in key["uids"] if uid)
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return keys
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@staticmethod
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def _strip_header_footer(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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@staticmethod
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def _add_header_footer(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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