Mercurial > libervia-backend

annotate libervia/backend/plugins/plugin_xep_0448.py @ 4270:0d7bb4df2343

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author Goffi <goffi@goffi.org>
date Wed, 19 Jun 2024 18:44:57 +0200
parents 4b842c1fb686
children 111dce64dcb5
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328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
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1 #!/usr/bin/env python3
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2
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
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3 # Libervia plugin for handling stateless file sharing encryption
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4 # Copyright (C) 2009-2022 Jérôme Poisson (goffi@goffi.org)
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5
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6 # This program is free software: you can redistribute it and/or modify
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7 # it under the terms of the GNU Affero General Public License as published by
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8 # the Free Software Foundation, either version 3 of the License, or
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9 # (at your option) any later version.
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10
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11 # This program is distributed in the hope that it will be useful,
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 # GNU Affero General Public License for more details.
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15
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
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16 # You should have received a copy of the GNU Affero General Public License
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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18
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
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19 import base64
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20 from functools import partial
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21 from pathlib import Path
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22 import secrets
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23 from textwrap import dedent
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24 from typing import Any, Dict, Optional, Tuple, Union
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25
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26 from cryptography.exceptions import AlreadyFinalized
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27 from cryptography.hazmat import backends
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28 from cryptography.hazmat.primitives import ciphers
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29 from cryptography.hazmat.primitives.ciphers import CipherContext, modes
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30 from cryptography.hazmat.primitives.padding import PKCS7, PaddingContext
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31 import treq
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32 from twisted.internet import defer
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33 from twisted.words.protocols.jabber.xmlstream import XMPPHandler
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34 from twisted.words.xish import domish
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35 from wokkel import disco, iwokkel
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36 from zope.interface import implementer
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37
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38 from libervia.backend.core import exceptions
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39 from libervia.backend.core.constants import Const as C
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40 from libervia.backend.core.core_types import SatXMPPEntity
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41 from libervia.backend.core.i18n import _
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42 from libervia.backend.core.log import getLogger
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43 from libervia.backend.tools import stream
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44 from libervia.backend.tools.web import treq_client_no_ssl
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45
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46 log = getLogger(__name__)
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47
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48 IMPORT_NAME = "XEP-0448"
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49
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50 PLUGIN_INFO = {
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51 C.PI_NAME: "Encryption for Stateless File Sharing",
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52 C.PI_IMPORT_NAME: IMPORT_NAME,
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53 C.PI_TYPE: C.PLUG_TYPE_EXP,
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54 C.PI_PROTOCOLS: ["XEP-0448"],
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55 C.PI_DEPENDENCIES: [
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56 "XEP-0103",
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57 "XEP-0300",
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58 "XEP-0334",
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59 "XEP-0363",
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60 "XEP-0384",
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61 "XEP-0447",
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62 "DOWNLOAD",
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63 "ATTACH",
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64 ],
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65 C.PI_MAIN: "XEP_0448",
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66 C.PI_HANDLER: "yes",
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67 C.PI_DESCRIPTION: dedent(
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68 _(
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69 """\
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70 Implementation of e2e encryption for media sharing
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71 """
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72 )
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73 ),
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74 }
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75
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76 NS_ESFS = "urn:xmpp:esfs:0"
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77 NS_AES_128_GCM = "urn:xmpp:ciphers:aes-128-gcm-nopadding:0"
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78 NS_AES_256_GCM = "urn:xmpp:ciphers:aes-256-gcm-nopadding:0"
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79 NS_AES_256_CBC = "urn:xmpp:ciphers:aes-256-cbc-pkcs7:0"
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80
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81
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82 class XEP_0448:
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83
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84 def __init__(self, host):
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85 self.host = host
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86 log.info(_("XEP_0448 plugin initialization"))
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87 host.register_namespace("esfs", NS_ESFS)
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88 self._u = host.plugins["XEP-0103"]
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89 self._h = host.plugins["XEP-0300"]
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90 self._hints = host.plugins["XEP-0334"]
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91 self._http_upload = host.plugins["XEP-0363"]
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92 self._o = host.plugins["XEP-0384"]
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93 self._sfs = host.plugins["XEP-0447"]
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94 self._sfs.register_source_handler(
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95 NS_ESFS, "encrypted", self.parse_encrypted_elt, encrypted=True
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96 )
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97 self._attach = host.plugins["ATTACH"]
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98 self._attach.register(
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99 self.can_handle_attachment, self.attach, encrypted=True, priority=1000
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100 )
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101 host.plugins["DOWNLOAD"].register_download_handler(NS_ESFS, self.download)
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102 host.trigger.add("XEP-0363_upload_pre_slot", self._upload_pre_slot)
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103 host.trigger.add("XEP-0363_upload", self._upload_trigger)
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104
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105 def get_handler(self, client):
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106 return XEP0448Handler()
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107
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108 def parse_encrypted_elt(self, encrypted_elt: domish.Element) -> Dict[str, Any]:
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109 """Parse an <encrypted> element and return corresponding source data
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110
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111 @param encrypted_elt: element to parse
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112 @raise exceptions.DataError: the element is invalid
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113
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114 """
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115 sources = self._sfs.parse_sources_elt(encrypted_elt)
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116 if not sources:
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117 raise exceptions.NotFound("sources are missing in {encrypted_elt.toXml()}")
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118 if len(sources) > 1:
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119 log.debug(
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120 "more that one sources has been found, this is not expected, only the "
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121 "first one will be used"
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122 )
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123 source = sources[0]
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124 source["type"] = NS_ESFS
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125 try:
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126 encrypted_data = source["encrypted_data"] = {
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127 "cipher": encrypted_elt["cipher"],
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128 "key": str(next(encrypted_elt.elements(NS_ESFS, "key"))),
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129 "iv": str(next(encrypted_elt.elements(NS_ESFS, "iv"))),
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
130 }
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
131 except (KeyError, StopIteration):
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
132 raise exceptions.DataError(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
133 "invalid <encrypted/> element: {encrypted_elt.toXml()}"
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
134 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
135 try:
4037
524856bd7b19 massive refactoring to switch from camelCase to snake_case:
Goffi <goffi@goffi.org>
parents: 4023
diff changeset
136 hash_algo, hash_value = self._h.parse_hash_elt(encrypted_elt)
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
137 except exceptions.NotFound:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
138 pass
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
139 else:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
140 encrypted_data["hash_algo"] = hash_algo
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
141 encrypted_data["hash"] = base64.b64encode(hash_value.encode()).decode()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
142 return source
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
143
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
144 async def download(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
145 self,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
146 client: SatXMPPEntity,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
147 attachment: Dict[str, Any],
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
148 source: Dict[str, Any],
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
149 dest_path: Union[Path, str],
4270
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
150 extra: Optional[Dict[str, Any]] = None,
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
151 ) -> Tuple[str, defer.Deferred]:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
152 # TODO: check hash
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
153 if extra is None:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
154 extra = {}
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
155 try:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
156 encrypted_data = source["encrypted_data"]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
157 cipher = encrypted_data["cipher"]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
158 iv = base64.b64decode(encrypted_data["iv"])
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
159 key = base64.b64decode(encrypted_data["key"])
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
160 except KeyError as e:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
161 raise ValueError(f"{source} has incomplete encryption data: {e}")
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
162 try:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
163 download_url = source["url"]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
164 except KeyError:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
165 raise ValueError(f"{source} has missing URL")
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
166
4270
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
167 if extra.get("ignore_tls_errors", False):
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
168 log.warning("TLS certificate check disabled, this is highly insecure")
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
169 treq_client = treq_client_no_ssl
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
170 else:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
171 treq_client = treq
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
172
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
173 try:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
174 file_size = int(attachment["size"])
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
175 except (KeyError, ValueError):
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
176 head_data = await treq_client.head(download_url)
4270
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
177 content_length = int(head_data.headers.getRawHeaders("content-length")[0])
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
178 # the 128 bits tag is put at the end
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
179 file_size = content_length - 16
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
180
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
181 file_obj = stream.SatFile(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
182 self.host,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
183 client,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
184 dest_path,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
185 mode="wb",
4270
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
186 size=file_size,
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
187 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
188
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
189 if cipher in (NS_AES_128_GCM, NS_AES_256_GCM):
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
190 decryptor = ciphers.Cipher(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
191 ciphers.algorithms.AES(key),
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
192 modes.GCM(iv),
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
193 backend=backends.default_backend(),
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
194 ).decryptor()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
195 decrypt_cb = partial(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
196 self.gcm_decrypt,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
197 client=client,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
198 file_obj=file_obj,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
199 decryptor=decryptor,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
200 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
201 finalize_cb = None
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
202 elif cipher == NS_AES_256_CBC:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
203 cipher_algo = ciphers.algorithms.AES(key)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
204 decryptor = ciphers.Cipher(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
205 cipher_algo,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
206 modes.CBC(iv),
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
207 backend=backends.default_backend(),
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
208 ).decryptor()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
209 unpadder = PKCS7(cipher_algo.block_size).unpadder()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
210 decrypt_cb = partial(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
211 self.cbc_decrypt,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
212 client=client,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
213 file_obj=file_obj,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
214 decryptor=decryptor,
4270
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
215 unpadder=unpadder,
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
216 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
217 finalize_cb = partial(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
218 self.cbc_decrypt_finalize,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
219 file_obj=file_obj,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
220 decryptor=decryptor,
4270
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
221 unpadder=unpadder,
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
222 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
223 else:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
224 msg = f"cipher {cipher!r} is not supported"
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
225 file_obj.close(error=msg)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
226 log.warning(msg)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
227 raise exceptions.CancelError(msg)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
228
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
229 progress_id = file_obj.uid
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
230
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
231 resp = await treq_client.get(download_url, unbuffered=True)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
232 if resp.code == 200:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
233 d = treq.collect(resp, partial(decrypt_cb))
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
234 if finalize_cb is not None:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
235 d.addCallback(lambda __: finalize_cb())
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
236 else:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
237 d = defer.Deferred()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
238 self.host.plugins["DOWNLOAD"].errback_download(file_obj, d, resp)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
239 return progress_id, d
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
240
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
241 async def can_handle_attachment(self, client, data):
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
242 # FIXME: check if SCE is supported without checking which e2ee algo is used
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
243 if client.encryption.get_namespace(data["to"]) != self._o.NS_TWOMEMO:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
244 # we need SCE, and it is currently supported only by TWOMEMO, thus we can't
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
245 # handle the attachment if it's not activated
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
246 return False
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
247 try:
4037
524856bd7b19 massive refactoring to switch from camelCase to snake_case:
Goffi <goffi@goffi.org>
parents: 4023
diff changeset
248 await self._http_upload.get_http_upload_entity(client)
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
249 except exceptions.NotFound:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
250 return False
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
251 else:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
252 return True
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
253
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
254 async def _upload_cb(self, client, filepath, filename, extra):
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
255 attachment = extra["attachment"]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
256 extra["encryption"] = IMPORT_NAME
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
257 attachment["encryption_data"] = extra["encryption_data"] = {
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
258 "algorithm": C.ENC_AES_GCM,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
259 "iv": secrets.token_bytes(12),
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
260 "key": secrets.token_bytes(32),
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
261 }
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
262 attachment["filename"] = filename
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
263 return await self._http_upload.file_http_upload(
4270
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
264 client=client, filepath=filepath, filename="encrypted", extra=extra
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
265 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
266
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
267 async def attach(self, client, data):
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
268 # XXX: for now, XEP-0447/XEP-0448 only allow to send one file per <message/>, thus
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
269 # we need to send each file in a separate message, in the same way as for
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
270 # plugin_sec_aesgcm.
4023
78b5f356900c component AP gateway: handle attachments
Goffi <goffi@goffi.org>
parents: 3934
diff changeset
271 attachments = data["extra"][C.KEY_ATTACHMENTS]
4270
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Goffi <goffi@goffi.org>
parents: 4071
diff changeset
272 if not data["message"] or data["message"] == {"": ""}:
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
273 extra_attachments = attachments[1:]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
274 del attachments[1:]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
275 else:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
276 # we have a message, we must send first attachment separately
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
277 extra_attachments = attachments[:]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
278 attachments.clear()
4023
78b5f356900c component AP gateway: handle attachments
Goffi <goffi@goffi.org>
parents: 3934
diff changeset
279 del data["extra"][C.KEY_ATTACHMENTS]
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
280
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
281 if attachments:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
282 if len(attachments) > 1:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
283 raise exceptions.InternalError(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
284 "There should not be more that one attachment at this point"
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
285 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
286 await self._attach.upload_files(client, data, upload_cb=self._upload_cb)
4037
524856bd7b19 massive refactoring to switch from camelCase to snake_case:
Goffi <goffi@goffi.org>
parents: 4023
diff changeset
287 self._hints.add_hint_elements(data["xml"], [self._hints.HINT_STORE])
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
288 for attachment in attachments:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
289 encryption_data = attachment.pop("encryption_data")
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
290 file_hash = (attachment["hash_algo"], attachment["hash"])
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
291 file_sharing_elt = self._sfs.get_file_sharing_elt(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
292 [],
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
293 name=attachment["filename"],
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
294 size=attachment["size"],
4270
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
295 file_hash=file_hash,
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
296 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
297 encrypted_elt = file_sharing_elt.sources.addElement(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
298 (NS_ESFS, "encrypted")
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
299 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
300 encrypted_elt["cipher"] = NS_AES_256_GCM
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
301 encrypted_elt.addElement(
4270
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
302 "key", content=base64.b64encode(encryption_data["key"]).decode()
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
303 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
304 encrypted_elt.addElement(
4270
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
305 "iv", content=base64.b64encode(encryption_data["iv"]).decode()
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
306 )
4270
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
307 encrypted_elt.addChild(
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
308 self._h.build_hash_elt(
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
309 attachment["encrypted_hash"], attachment["encrypted_hash_algo"]
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
310 )
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
311 )
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
312 encrypted_elt.addChild(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
313 self._sfs.get_sources_elt(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
314 [self._u.get_url_data_elt(attachment["url"])]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
315 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
316 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
317 data["xml"].addChild(file_sharing_elt)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
318
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
319 for attachment in extra_attachments:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
320 # we send all remaining attachment in a separate message
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
321 await client.sendMessage(
4270
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
322 to_jid=data["to"],
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
323 message={"": ""},
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
324 subject=data["subject"],
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
325 mess_type=data["type"],
4023
78b5f356900c component AP gateway: handle attachments
Goffi <goffi@goffi.org>
parents: 3934
diff changeset
326 extra={C.KEY_ATTACHMENTS: [attachment]},
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
327 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
328
4270
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
329 if (
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
330 not data["extra"]
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
331 and (not data["message"] or data["message"] == {"": ""})
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
332 and not data["subject"]
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
333 ):
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
334 # nothing left to send, we can cancel the message
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
335 raise exceptions.CancelError("Cancelled by XEP_0448 attachment handling")
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
336
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
337 def gcm_decrypt(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
338 self,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
339 data: bytes,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
340 client: SatXMPPEntity,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
341 file_obj: stream.SatFile,
4270
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
342 decryptor: CipherContext,
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
343 ) -> None:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
344 if file_obj.tell() + len(data) > file_obj.size: # type: ignore
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
345 # we're reaching end of file with this bunch of data
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
346 # we may still have a last bunch if the tag is incomplete
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
347 bytes_left = file_obj.size - file_obj.tell() # type: ignore
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
348 if bytes_left > 0:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
349 decrypted = decryptor.update(data[:bytes_left])
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
350 file_obj.write(decrypted)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
351 tag = data[bytes_left:]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
352 else:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
353 tag = data
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
354 if len(tag) < 16:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
355 # the tag is incomplete, either we'll get the rest in next data bunch
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
356 # or we have already the other part from last bunch of data
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
357 try:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
358 # we store partial tag in decryptor._sat_tag
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
359 tag = decryptor._sat_tag + tag
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
360 except AttributeError:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
361 # no other part, we'll get the rest at next bunch
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
362 decryptor.sat_tag = tag
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
363 else:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
364 # we have the complete tag, it must be 128 bits
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
365 if len(tag) != 16:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
366 raise ValueError(f"Invalid tag: {tag}")
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
367 remain = decryptor.finalize_with_tag(tag)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
368 file_obj.write(remain)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
369 file_obj.close()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
370 else:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
371 decrypted = decryptor.update(data)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
372 file_obj.write(decrypted)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
373
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
374 def cbc_decrypt(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
375 self,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
376 data: bytes,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
377 client: SatXMPPEntity,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
378 file_obj: stream.SatFile,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
379 decryptor: CipherContext,
4270
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
380 unpadder: PaddingContext,
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
381 ) -> None:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
382 decrypted = decryptor.update(data)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
383 file_obj.write(unpadder.update(decrypted))
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
384
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
385 def cbc_decrypt_finalize(
4270
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
386 self, file_obj: stream.SatFile, decryptor: CipherContext, unpadder: PaddingContext
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
387 ) -> None:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
388 decrypted = decryptor.finalize()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
389 file_obj.write(unpadder.update(decrypted))
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
390 file_obj.write(unpadder.finalize())
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
391 file_obj.close()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
392
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
393 def _upload_pre_slot(self, client, extra, file_metadata):
4270
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
394 if extra.get("encryption") != IMPORT_NAME:
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
395 return True
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
396 # the tag is appended to the file
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
397 file_metadata["size"] += 16
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
398 return True
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
399
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
400 def _encrypt(self, data: bytes, encryptor: CipherContext, attachment: dict) -> bytes:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
401 if data:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
402 attachment["hasher"].update(data)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
403 ret = encryptor.update(data)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
404 attachment["encrypted_hasher"].update(ret)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
405 return ret
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
406 else:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
407 try:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
408 # end of file is reached, me must finalize
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
409 fin = encryptor.finalize()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
410 tag = encryptor.tag
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
411 ret = fin + tag
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
412 hasher = attachment.pop("hasher")
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
413 attachment["hash"] = hasher.hexdigest()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
414 encrypted_hasher = attachment.pop("encrypted_hasher")
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
415 encrypted_hasher.update(ret)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
416 attachment["encrypted_hash"] = encrypted_hasher.hexdigest()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
417 return ret
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
418 except AlreadyFinalized:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
419 # as we have already finalized, we can now send EOF
4270
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
420 return b""
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
421
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
422 def _upload_trigger(self, client, extra, sat_file, file_producer, slot):
4270
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
423 if extra.get("encryption") != IMPORT_NAME:
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
424 return True
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
425 attachment = extra["attachment"]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
426 encryption_data = extra["encryption_data"]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
427 log.debug("encrypting file with AES-GCM")
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
428 iv = encryption_data["iv"]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
429 key = encryption_data["key"]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
430
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
431 # encrypted data size will be bigger than original file size
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
432 # so we need to check with final data length to avoid a warning on close()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
433 sat_file.check_size_with_read = True
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
434
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
435 # file_producer get length directly from file, and this cause trouble as
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
436 # we have to change the size because of encryption. So we adapt it here,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
437 # else the producer would stop reading prematurely
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
438 file_producer.length = sat_file.size
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
439
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
440 encryptor = ciphers.Cipher(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
441 ciphers.algorithms.AES(key),
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
442 modes.GCM(iv),
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
443 backend=backends.default_backend(),
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
444 ).encryptor()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
445
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
446 if sat_file.data_cb is not None:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
447 raise exceptions.InternalError(
4270
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
448 f"data_cb was expected to be None, it is set to {sat_file.data_cb}"
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
449 )
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
450
4270
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
451 attachment.update(
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
452 {
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
453 "hash_algo": self._h.ALGO_DEFAULT,
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
454 "hasher": self._h.get_hasher(),
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
455 "encrypted_hash_algo": self._h.ALGO_DEFAULT,
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
456 "encrypted_hasher": self._h.get_hasher(),
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
457 }
0d7bb4df2343 Reformatted code base using black.
Goffi <goffi@goffi.org>
parents: 4071
diff changeset
458 )
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
459
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
460 # with data_cb we encrypt the file on the fly
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
461 sat_file.data_cb = partial(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
462 self._encrypt, encryptor=encryptor, attachment=attachment
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
463 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
464 return True
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
465
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
466
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
467 @implementer(iwokkel.IDisco)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
468 class XEP0448Handler(XMPPHandler):
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
469
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
470 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
471 return [disco.DiscoFeature(NS_ESFS)]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
472
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
473 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
474 return []