annotate libervia/backend/plugins/plugin_xep_0448.py @ 4175:30f7513e5590

plugin XEP-0277: generate and parse altertate links with the new `alt_links` data in `extra`
author Goffi <goffi@goffi.org>
date Tue, 05 Dec 2023 13:14:03 +0100
parents 4b842c1fb686
children 0d7bb4df2343
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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
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
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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
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
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8 # the Free Software Foundation, either version 3 of the License, or
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
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9 # (at your option) any later version.
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10
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
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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
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
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14 # GNU Affero General Public License for more details.
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
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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
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
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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
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
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48 IMPORT_NAME = "XEP-0448"
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49
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
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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",
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
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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
328869756cf4 plugin XEP-0448: Encryption for stateless file sharing implementation:
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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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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 []