1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
# 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 logging
from nbxmpp.protocol import JID
import gpg
from gpg.results import ImportResult
from openpgp.backend.util import parse_uid
from openpgp.modules.util import DecryptionFailed
log = logging.getLogger('gajim.p.openpgp.gpgme')
class KeyringItem:
def __init__(self, key):
self._key = key
self._uid = self._get_uid()
@property
def is_xmpp_key(self) -> bool:
try:
return self.jid is not None
except Exception:
return False
def is_valid(self, jid: JID) -> bool:
if not self.is_xmpp_key:
return False
return jid == self.jid
def _get_uid(self) -> str | None:
for uid in self._key.uids:
try:
return parse_uid(uid.uid)
except Exception:
pass
@property
def fingerprint(self):
return self._key.fpr
@property
def uid(self):
if self._uid is not None:
return self._uid
@property
def jid(self):
if self._uid is not None:
return JID.from_string(self._uid)
def __hash__(self):
return hash(self.fingerprint)
class GPGME:
def __init__(self, jid, gnuhome):
self._jid = jid
self._context_args = {
'home_dir': str(gnuhome),
'offline': True,
'armor': False,
}
def generate_key(self):
with gpg.Context(**self._context_args) as context:
result = context.create_key(f'xmpp:{str(self._jid)}',
expires=False,
sign=True,
encrypt=True,
certify=False,
authenticate=False,
passphrase=None,
force=False)
log.info('Generated new key: %s', result.fpr)
def get_key(self, fingerprint):
with gpg.Context(**self._context_args) as context:
try:
key = context.get_key(fingerprint)
except gpg.errors.KeyNotFound as error:
log.warning('key not found: %s', error.keystr)
return
except Exception as error:
log.warning('get_key() error: %s', error)
return
return key
def get_own_key_details(self):
with gpg.Context(**self._context_args) as context:
keys = list(context.keylist(secret=True))
if not keys:
return None, None
key = keys[0]
for subkey in key.subkeys:
if subkey.fpr == key.fpr:
return subkey.fpr, subkey.timestamp
return None, None
def get_keys(self):
keys = []
with gpg.Context(**self._context_args) as context:
for key in context.keylist():
keyring_item = KeyringItem(key)
if not keyring_item.is_xmpp_key:
log.warning('Key not suited for xmpp: %s', key.fpr)
self.delete_key(keyring_item.fingerprint)
continue
keys.append(keyring_item)
return keys
def export_key(self, fingerprint):
with gpg.Context(**self._context_args) as context:
key = context.key_export_minimal(pattern=fingerprint)
return key
# def encrypt_decrypt_files(self):
# c = gpg.Context()
# recipient = c.get_key("fingerprint of recipient's key")
# # Encrypt
# with open('foo.txt', 'r') as input_file:
# with open('foo.txt.gpg', 'wb') as output_file:
# c.encrypt([recipient], 0, input_file, output_file)
# # Decrypt
# with open('foo.txt.gpg', 'rb') as input_file:
# with open('foo2.txt', 'w') as output_file:
# c.decrypt(input_file, output_file)
def encrypt(self, plaintext, keys):
recipients = []
with gpg.Context(**self._context_args) as context:
for key in keys:
key = context.get_key(key.fingerprint)
if key is not None:
recipients.append(key)
if not recipients:
return None, 'No keys found to encrypt to'
with gpg.Context(**self._context_args) as context:
result = context.encrypt(str(plaintext).encode(),
recipients,
always_trust=True)
ciphertext, result, _sign_result = result
return ciphertext, None
def decrypt(self, ciphertext):
with gpg.Context(**self._context_args) as context:
try:
result = context.decrypt(ciphertext)
except Exception as error:
raise DecryptionFailed('Decryption failed: %s' % error)
plaintext, result, verify_result = result
plaintext = plaintext.decode()
fingerprints = [sig.fpr for sig in verify_result.signatures]
if not fingerprints or len(fingerprints) > 1:
log.error(result)
log.error(verify_result)
raise DecryptionFailed('Verification failed')
return plaintext, fingerprints[0]
def import_key(self, data, jid):
log.info('Import key from %s', jid)
with gpg.Context(**self._context_args) as context:
result = context.key_import(data)
if not isinstance(result, ImportResult) or result.imported != 1:
log.error('Key import failed: %s', jid)
log.error(result)
return
fingerprint = result.imports[0].fpr
key = self.get_key(fingerprint)
item = KeyringItem(key)
if not item.is_valid(jid):
log.warning('Invalid key found')
log.warning(key)
self.delete_key(item.fingerprint)
return
return item
def delete_key(self, fingerprint):
log.info('Delete Key: %s', fingerprint)
key = self.get_key(fingerprint)
with gpg.Context(**self._context_args) as context:
context.op_delete(key, True)
|
