annotate libervia/backend/plugins/plugin_xep_0448.py @ 4242:8acf46ed7f36

frontends: remote control implementation: This is the frontends common part of remote control implementation. It handle the creation of WebRTC session, and management of inputs. For now the reception use freedesktop.org Desktop portal, and works mostly with Wayland based Desktop Environments. rel 436
author Goffi <goffi@goffi.org>
date Sat, 11 May 2024 13:52:43 +0200
parents 4b842c1fb686
children 0d7bb4df2343
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328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
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1 #!/usr/bin/env python3
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2
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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
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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", "XEP-0300", "XEP-0334", "XEP-0363", "XEP-0384", "XEP-0447",
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57 "DOWNLOAD", "ATTACH"
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58 ],
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59 C.PI_MAIN: "XEP_0448",
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60 C.PI_HANDLER: "yes",
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61 C.PI_DESCRIPTION: dedent(_("""\
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62 Implementation of e2e encryption for media sharing
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63 """)),
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64 }
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65
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66 NS_ESFS = "urn:xmpp:esfs:0"
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67 NS_AES_128_GCM = "urn:xmpp:ciphers:aes-128-gcm-nopadding:0"
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68 NS_AES_256_GCM = "urn:xmpp:ciphers:aes-256-gcm-nopadding:0"
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69 NS_AES_256_CBC = "urn:xmpp:ciphers:aes-256-cbc-pkcs7:0"
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70
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71
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72 class XEP_0448:
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73
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74 def __init__(self, host):
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75 self.host = host
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76 log.info(_("XEP_0448 plugin initialization"))
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77 host.register_namespace("esfs", NS_ESFS)
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78 self._u = host.plugins["XEP-0103"]
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79 self._h = host.plugins["XEP-0300"]
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80 self._hints = host.plugins["XEP-0334"]
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81 self._http_upload = host.plugins["XEP-0363"]
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82 self._o = host.plugins["XEP-0384"]
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83 self._sfs = host.plugins["XEP-0447"]
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84 self._sfs.register_source_handler(
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85 NS_ESFS, "encrypted", self.parse_encrypted_elt, encrypted=True
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86 )
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87 self._attach = host.plugins["ATTACH"]
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88 self._attach.register(
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89 self.can_handle_attachment, self.attach, encrypted=True, priority=1000
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90 )
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91 host.plugins["DOWNLOAD"].register_download_handler(NS_ESFS, self.download)
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92 host.trigger.add("XEP-0363_upload_pre_slot", self._upload_pre_slot)
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93 host.trigger.add("XEP-0363_upload", self._upload_trigger)
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94
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95 def get_handler(self, client):
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96 return XEP0448Handler()
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97
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98 def parse_encrypted_elt(self, encrypted_elt: domish.Element) -> Dict[str, Any]:
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99 """Parse an <encrypted> element and return corresponding source data
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100
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101 @param encrypted_elt: element to parse
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102 @raise exceptions.DataError: the element is invalid
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103
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104 """
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105 sources = self._sfs.parse_sources_elt(encrypted_elt)
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106 if not sources:
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107 raise exceptions.NotFound("sources are missing in {encrypted_elt.toXml()}")
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108 if len(sources) > 1:
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109 log.debug(
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110 "more that one sources has been found, this is not expected, only the "
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111 "first one will be used"
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112 )
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113 source = sources[0]
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114 source["type"] = NS_ESFS
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115 try:
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116 encrypted_data = source["encrypted_data"] = {
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117 "cipher": encrypted_elt["cipher"],
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118 "key": str(next(encrypted_elt.elements(NS_ESFS, "key"))),
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119 "iv": str(next(encrypted_elt.elements(NS_ESFS, "iv"))),
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120 }
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121 except (KeyError, StopIteration):
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122 raise exceptions.DataError(
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123 "invalid <encrypted/> element: {encrypted_elt.toXml()}"
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124 )
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125 try:
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126 hash_algo, hash_value = self._h.parse_hash_elt(encrypted_elt)
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diff changeset
127 except exceptions.NotFound:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
128 pass
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
129 else:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
130 encrypted_data["hash_algo"] = hash_algo
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
131 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
132 return source
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
133
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
134 async def download(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
135 self,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
136 client: SatXMPPEntity,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
137 attachment: Dict[str, Any],
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
138 source: Dict[str, Any],
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
139 dest_path: Union[Path, str],
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
140 extra: Optional[Dict[str, Any]] = None
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
141 ) -> Tuple[str, defer.Deferred]:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
142 # TODO: check hash
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
143 if extra is None:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
144 extra = {}
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
145 try:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
146 encrypted_data = source["encrypted_data"]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
147 cipher = encrypted_data["cipher"]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
148 iv = base64.b64decode(encrypted_data["iv"])
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
149 key = base64.b64decode(encrypted_data["key"])
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
150 except KeyError as e:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
151 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
152 try:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
153 download_url = source["url"]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
154 except KeyError:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
155 raise ValueError(f"{source} has missing URL")
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
156
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
157 if extra.get('ignore_tls_errors', False):
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
158 log.warning(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
159 "TLS certificate check disabled, this is highly insecure"
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
160 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
161 treq_client = treq_client_no_ssl
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
162 else:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
163 treq_client = treq
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
164
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
165 try:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
166 file_size = int(attachment["size"])
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
167 except (KeyError, ValueError):
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
168 head_data = await treq_client.head(download_url)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
169 content_length = int(head_data.headers.getRawHeaders('content-length')[0])
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
170 # 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
171 file_size = content_length - 16
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 file_obj = stream.SatFile(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
174 self.host,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
175 client,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
176 dest_path,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
177 mode="wb",
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
178 size = file_size,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
179 )
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 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
182 decryptor = ciphers.Cipher(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
183 ciphers.algorithms.AES(key),
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
184 modes.GCM(iv),
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
185 backend=backends.default_backend(),
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
186 ).decryptor()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
187 decrypt_cb = partial(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
188 self.gcm_decrypt,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
189 client=client,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
190 file_obj=file_obj,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
191 decryptor=decryptor,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
192 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
193 finalize_cb = None
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
194 elif cipher == NS_AES_256_CBC:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
195 cipher_algo = ciphers.algorithms.AES(key)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
196 decryptor = ciphers.Cipher(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
197 cipher_algo,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
198 modes.CBC(iv),
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
199 backend=backends.default_backend(),
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
200 ).decryptor()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
201 unpadder = PKCS7(cipher_algo.block_size).unpadder()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
202 decrypt_cb = partial(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
203 self.cbc_decrypt,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
204 client=client,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
205 file_obj=file_obj,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
206 decryptor=decryptor,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
207 unpadder=unpadder
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
208 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
209 finalize_cb = partial(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
210 self.cbc_decrypt_finalize,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
211 file_obj=file_obj,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
212 decryptor=decryptor,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
213 unpadder=unpadder
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
214 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
215 else:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
216 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
217 file_obj.close(error=msg)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
218 log.warning(msg)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
219 raise exceptions.CancelError(msg)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
220
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
221 progress_id = file_obj.uid
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 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
224 if resp.code == 200:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
225 d = treq.collect(resp, partial(decrypt_cb))
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
226 if finalize_cb is not None:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
227 d.addCallback(lambda __: finalize_cb())
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
228 else:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
229 d = defer.Deferred()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
230 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
231 return progress_id, d
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
232
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
233 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
234 # 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
235 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
236 # 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
237 # 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
238 return False
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
239 try:
4037
524856bd7b19 massive refactoring to switch from camelCase to snake_case:
Goffi <goffi@goffi.org>
parents: 4023
diff changeset
240 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
241 except exceptions.NotFound:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
242 return False
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
243 else:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
244 return True
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
245
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
246 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
247 attachment = extra["attachment"]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
248 extra["encryption"] = IMPORT_NAME
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
249 attachment["encryption_data"] = extra["encryption_data"] = {
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
250 "algorithm": C.ENC_AES_GCM,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
251 "iv": secrets.token_bytes(12),
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
252 "key": secrets.token_bytes(32),
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 attachment["filename"] = filename
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
255 return await self._http_upload.file_http_upload(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
256 client=client,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
257 filepath=filepath,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
258 filename="encrypted",
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
259 extra=extra
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
260 )
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 async def attach(self, client, data):
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
263 # 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
264 # 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
265 # plugin_sec_aesgcm.
4023
78b5f356900c component AP gateway: handle attachments
Goffi <goffi@goffi.org>
parents: 3934
diff changeset
266 attachments = data["extra"][C.KEY_ATTACHMENTS]
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
267 if not data['message'] or data['message'] == {'': ''}:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
268 extra_attachments = attachments[1:]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
269 del attachments[1:]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
270 else:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
271 # 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
272 extra_attachments = attachments[:]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
273 attachments.clear()
4023
78b5f356900c component AP gateway: handle attachments
Goffi <goffi@goffi.org>
parents: 3934
diff changeset
274 del data["extra"][C.KEY_ATTACHMENTS]
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
275
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
276 if attachments:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
277 if len(attachments) > 1:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
278 raise exceptions.InternalError(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
279 "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
280 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
281 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
282 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
283 for attachment in attachments:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
284 encryption_data = attachment.pop("encryption_data")
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
285 file_hash = (attachment["hash_algo"], attachment["hash"])
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
286 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
287 [],
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
288 name=attachment["filename"],
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
289 size=attachment["size"],
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
290 file_hash=file_hash
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
291 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
292 encrypted_elt = file_sharing_elt.sources.addElement(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
293 (NS_ESFS, "encrypted")
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
294 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
295 encrypted_elt["cipher"] = NS_AES_256_GCM
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
296 encrypted_elt.addElement(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
297 "key",
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
298 content=base64.b64encode(encryption_data["key"]).decode()
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.addElement(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
301 "iv",
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
302 content=base64.b64encode(encryption_data["iv"]).decode()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
303 )
4037
524856bd7b19 massive refactoring to switch from camelCase to snake_case:
Goffi <goffi@goffi.org>
parents: 4023
diff changeset
304 encrypted_elt.addChild(self._h.build_hash_elt(
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
305 attachment["encrypted_hash"],
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
306 attachment["encrypted_hash_algo"]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
307 ))
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
308 encrypted_elt.addChild(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
309 self._sfs.get_sources_elt(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
310 [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
311 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
312 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
313 data["xml"].addChild(file_sharing_elt)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
314
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
315 for attachment in extra_attachments:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
316 # 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
317 await client.sendMessage(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
318 to_jid=data['to'],
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
319 message={'': ''},
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
320 subject=data['subject'],
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
321 mess_type=data['type'],
4023
78b5f356900c component AP gateway: handle attachments
Goffi <goffi@goffi.org>
parents: 3934
diff changeset
322 extra={C.KEY_ATTACHMENTS: [attachment]},
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
323 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
324
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
325 if ((not data['extra']
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
326 and (not data['message'] or data['message'] == {'': ''})
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
327 and not data['subject'])):
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
328 # 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
329 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
330
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
331 def gcm_decrypt(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
332 self,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
333 data: bytes,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
334 client: SatXMPPEntity,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
335 file_obj: stream.SatFile,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
336 decryptor: CipherContext
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
337 ) -> None:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
338 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
339 # 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
340 # 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
341 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
342 if bytes_left > 0:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
343 decrypted = decryptor.update(data[:bytes_left])
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
344 file_obj.write(decrypted)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
345 tag = data[bytes_left:]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
346 else:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
347 tag = data
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
348 if len(tag) < 16:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
349 # 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
350 # 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
351 try:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
352 # 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
353 tag = decryptor._sat_tag + tag
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
354 except AttributeError:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
355 # 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
356 decryptor.sat_tag = tag
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
357 else:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
358 # 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
359 if len(tag) != 16:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
360 raise ValueError(f"Invalid tag: {tag}")
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
361 remain = decryptor.finalize_with_tag(tag)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
362 file_obj.write(remain)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
363 file_obj.close()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
364 else:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
365 decrypted = decryptor.update(data)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
366 file_obj.write(decrypted)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
367
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
368 def cbc_decrypt(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
369 self,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
370 data: bytes,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
371 client: SatXMPPEntity,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
372 file_obj: stream.SatFile,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
373 decryptor: CipherContext,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
374 unpadder: PaddingContext
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
375 ) -> None:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
376 decrypted = decryptor.update(data)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
377 file_obj.write(unpadder.update(decrypted))
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
378
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
379 def cbc_decrypt_finalize(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
380 self,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
381 file_obj: stream.SatFile,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
382 decryptor: CipherContext,
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
383 unpadder: PaddingContext
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
384 ) -> None:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
385 decrypted = decryptor.finalize()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
386 file_obj.write(unpadder.update(decrypted))
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
387 file_obj.write(unpadder.finalize())
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
388 file_obj.close()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
389
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
390 def _upload_pre_slot(self, client, extra, file_metadata):
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
391 if extra.get('encryption') != IMPORT_NAME:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
392 return True
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
393 # the tag is appended to the file
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
394 file_metadata["size"] += 16
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
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
397 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
398 if data:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
399 attachment["hasher"].update(data)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
400 ret = encryptor.update(data)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
401 attachment["encrypted_hasher"].update(ret)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
402 return ret
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
403 else:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
404 try:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
405 # 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
406 fin = encryptor.finalize()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
407 tag = encryptor.tag
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
408 ret = fin + tag
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
409 hasher = attachment.pop("hasher")
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
410 attachment["hash"] = hasher.hexdigest()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
411 encrypted_hasher = attachment.pop("encrypted_hasher")
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
412 encrypted_hasher.update(ret)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
413 attachment["encrypted_hash"] = encrypted_hasher.hexdigest()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
414 return ret
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
415 except AlreadyFinalized:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
416 # as we have already finalized, we can now send EOF
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
417 return b''
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
418
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
419 def _upload_trigger(self, client, extra, sat_file, file_producer, slot):
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
420 if extra.get('encryption') != IMPORT_NAME:
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
421 return True
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
422 attachment = extra["attachment"]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
423 encryption_data = extra["encryption_data"]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
424 log.debug("encrypting file with AES-GCM")
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
425 iv = encryption_data["iv"]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
426 key = encryption_data["key"]
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
427
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
428 # 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
429 # 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
430 sat_file.check_size_with_read = True
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
431
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
432 # 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
433 # 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
434 # else the producer would stop reading prematurely
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
435 file_producer.length = sat_file.size
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
436
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
437 encryptor = ciphers.Cipher(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
438 ciphers.algorithms.AES(key),
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
439 modes.GCM(iv),
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
440 backend=backends.default_backend(),
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
441 ).encryptor()
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
442
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
443 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
444 raise exceptions.InternalError(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
445 f"data_cb was expected to be None, it is set to {sat_file.data_cb}")
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
446
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
447 attachment.update({
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
448 "hash_algo": self._h.ALGO_DEFAULT,
4037
524856bd7b19 massive refactoring to switch from camelCase to snake_case:
Goffi <goffi@goffi.org>
parents: 4023
diff changeset
449 "hasher": self._h.get_hasher(),
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
450 "encrypted_hash_algo": self._h.ALGO_DEFAULT,
4037
524856bd7b19 massive refactoring to switch from camelCase to snake_case:
Goffi <goffi@goffi.org>
parents: 4023
diff changeset
451 "encrypted_hasher": self._h.get_hasher(),
3927
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
452 })
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
453
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
454 # 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
455 sat_file.data_cb = partial(
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
456 self._encrypt, encryptor=encryptor, attachment=attachment
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
457 )
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
458 return True
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
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
461 @implementer(iwokkel.IDisco)
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
462 class XEP0448Handler(XMPPHandler):
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 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
465 return [disco.DiscoFeature(NS_ESFS)]
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 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
468 return []