Mercurial > libervia-backend

annotate sat/plugins/plugin_sec_aesgcm.py @ 3370:2157880ba3b4

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core: plugins can now be loaded from a directory: A plugin can now be a directory with a name starting by `plugin_`. It will then be loaded as a module. The `__init__.py` file must contain the `PLUGIN_INFO` dict with metadata.
author Goffi <goffi@goffi.org>
date Sun, 20 Sep 2020 14:05:40 +0200
parents 653fa213d2f8
children be6d91572633
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1 #!/usr/bin/env python3
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2
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3 # SàT plugin for handling AES-GCM file encryption
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4 # Copyright (C) 2009-2020 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
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19 import re
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20 from textwrap import dedent
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21 from functools import partial
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22 from urllib import parse
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23 import mimetypes
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24 import secrets
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25 from cryptography.hazmat.primitives import ciphers
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26 from cryptography.hazmat.primitives.ciphers import modes
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27 from cryptography.hazmat import backends
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28 from cryptography.exceptions import AlreadyFinalized
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29 import treq
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30 from twisted.internet import defer
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31 from sat.core.i18n import _
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32 from sat.core.constants import Const as C
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33 from sat.core import exceptions
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34 from sat.tools import stream
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35 from sat.core.log import getLogger
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36 from sat.tools.web import treq_client_no_ssl
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37
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38 log = getLogger(__name__)
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39
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40 PLUGIN_INFO = {
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41 C.PI_NAME: "AES-GCM",
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42 C.PI_IMPORT_NAME: "AES-GCM",
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43 C.PI_TYPE: "SEC",
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44 C.PI_PROTOCOLS: ["OMEMO Media sharing"],
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45 C.PI_DEPENDENCIES: ["XEP-0363", "XEP-0384", "DOWNLOAD", "ATTACH"],
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46 C.PI_MAIN: "AESGCM",
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47 C.PI_HANDLER: "no",
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48 C.PI_DESCRIPTION: dedent(_("""\
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49 Implementation of AES-GCM scheme, a way to encrypt files (not official XMPP standard).
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50 See https://xmpp.org/extensions/inbox/omemo-media-sharing.html for details
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51 """)),
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52 }
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53
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54 AESGCM_RE = re.compile(
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55 r'aesgcm:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9'
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56 r'()@:%_\+.~#?&\/\/=]*)')
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57
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58
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59 class AESGCM(object):
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60
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61 def __init__(self, host):
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62 self.host = host
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63 log.info(_("AESGCM plugin initialization"))
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64 self._http_upload = host.plugins['XEP-0363']
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65 self._attach = host.plugins["ATTACH"]
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66 host.plugins["DOWNLOAD"].registerScheme(
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67 "aesgcm", self.download
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68 )
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69 self._attach.register(
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70 self.canHandleAttachment, self.attach, encrypted=True)
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71 host.trigger.add("XEP-0363_upload_size", self._uploadSizeTrigger)
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72 host.trigger.add("XEP-0363_upload", self._uploadTrigger)
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73 host.trigger.add("messageReceived", self._messageReceivedTrigger)
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74
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75 async def download(self, client, uri_parsed, dest_path, options):
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76 fragment = bytes.fromhex(uri_parsed.fragment)
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77
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78 # legacy method use 16 bits IV, but OMEMO media sharing published spec indicates
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79 # which is 12 bits IV (AES-GCM spec recommandation), so we have to determine
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80 # which size has been used.
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81 if len(fragment) == 48:
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82 iv_size = 16
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83 elif len(fragment) == 44:
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84 iv_size = 12
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85 else:
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86 raise ValueError(
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87 f"Invalid URL fragment, can't decrypt file at {uri_parsed.get_url()}")
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88
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89 iv, key = fragment[:iv_size], fragment[iv_size:]
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90
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91 decryptor = ciphers.Cipher(
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92 ciphers.algorithms.AES(key),
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93 modes.GCM(iv),
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94 backend=backends.default_backend(),
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95 ).decryptor()
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96
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97 download_url = parse.urlunparse(
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98 ('https', uri_parsed.netloc, uri_parsed.path, '', '', ''))
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99
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100 if options.get('ignore_tls_errors', False):
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101 log.warning(
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102 "TLS certificate check disabled, this is highly insecure"
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103 )
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104 treq_client = treq_client_no_ssl
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105 else:
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106 treq_client = treq
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107
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108 head_data = await treq_client.head(download_url)
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109 content_length = int(head_data.headers.getRawHeaders('content-length')[0])
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110 # the 128 bits tag is put at the end
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diff changeset
111 file_size = content_length - 16
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
112
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
113 file_obj = stream.SatFile(
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
114 self.host,
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
115 client,
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
116 dest_path,
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
117 mode="wb",
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
118 size = file_size,
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
119 )
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
120
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
121 progress_id = file_obj.uid
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
122
3205
2c0628f3927e plugin download, aesgcm: disable TLS check if `check_certificate` setting is disabled
Goffi <goffi@goffi.org>
parents: 3196
diff changeset
123 resp = await treq_client.get(download_url, unbuffered=True)
3186
84b0c8b4dee0 plugin download, aesgcm: fixed handling of HTTP errors
Goffi <goffi@goffi.org>
parents: 3178
diff changeset
124 if resp.code == 200:
84b0c8b4dee0 plugin download, aesgcm: fixed handling of HTTP errors
Goffi <goffi@goffi.org>
parents: 3178
diff changeset
125 d = treq.collect(resp, partial(
84b0c8b4dee0 plugin download, aesgcm: fixed handling of HTTP errors
Goffi <goffi@goffi.org>
parents: 3178
diff changeset
126 self.onDataDownload,
84b0c8b4dee0 plugin download, aesgcm: fixed handling of HTTP errors
Goffi <goffi@goffi.org>
parents: 3178
diff changeset
127 client=client,
84b0c8b4dee0 plugin download, aesgcm: fixed handling of HTTP errors
Goffi <goffi@goffi.org>
parents: 3178
diff changeset
128 file_obj=file_obj,
84b0c8b4dee0 plugin download, aesgcm: fixed handling of HTTP errors
Goffi <goffi@goffi.org>
parents: 3178
diff changeset
129 decryptor=decryptor))
84b0c8b4dee0 plugin download, aesgcm: fixed handling of HTTP errors
Goffi <goffi@goffi.org>
parents: 3178
diff changeset
130 else:
84b0c8b4dee0 plugin download, aesgcm: fixed handling of HTTP errors
Goffi <goffi@goffi.org>
parents: 3178
diff changeset
131 d = defer.Deferred()
84b0c8b4dee0 plugin download, aesgcm: fixed handling of HTTP errors
Goffi <goffi@goffi.org>
parents: 3178
diff changeset
132 self.host.plugins["DOWNLOAD"].errbackDownload(file_obj, d, resp)
3090
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
133 return progress_id, d
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
134
3219
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
135 async def canHandleAttachment(self, client, data):
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
136 try:
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
137 await self._http_upload.getHTTPUploadEntity(client)
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
138 except exceptions.NotFound:
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
139 return False
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
140 else:
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
141 return True
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
142
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
143 async def _uploadCb(self, client, filepath, filename, options):
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
144 options['encryption'] = C.ENC_AES_GCM
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
145 return await self._http_upload.fileHTTPUpload(
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
146 client=client,
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
147 filepath=filepath,
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
148 filename=filename,
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
149 options=options
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
150 )
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
151
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
152 async def attach(self, client, data):
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
153 # XXX: the attachment removal/resend code below is due to the one file per
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
154 # message limitation of OMEMO media sharing unofficial XEP. We have to remove
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
155 # attachments from original message, and send them one by one.
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
156 # TODO: this is to be removed when a better mechanism is available with OMEMO (now
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
157 # possible with the 0.4 version of OMEMO, it's possible to encrypt other stanza
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
158 # elements than body).
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
159 attachments = data["extra"][C.MESS_KEY_ATTACHMENTS]
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
160 if not data['message'] or data['message'] == {'': ''}:
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
161 extra_attachments = attachments[1:]
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
162 del attachments[1:]
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
163 await self._attach.uploadFiles(client, data, upload_cb=self._uploadCb)
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
164 else:
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
165 # we have a message, we must send first attachment separately
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
166 extra_attachments = attachments[:]
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
167 attachments.clear()
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
168 del data["extra"][C.MESS_KEY_ATTACHMENTS]
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
169
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
170 body_elt = next(data["xml"].elements((C.NS_CLIENT, "body")))
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
171
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
172 for attachment in attachments:
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
173 body_elt.addContent(attachment["url"])
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
174
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
175 for attachment in extra_attachments:
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
176 # we send all remaining attachment in a separate message
3222
653fa213d2f8 plugin aesgcm: wait for each splitted message to be sent before sending next one
Goffi <goffi@goffi.org>
parents: 3219
diff changeset
177 await client.sendMessage(
3219
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
178 to_jid=data['to'],
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
179 message={'': ''},
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
180 subject=data['subject'],
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
181 mess_type=data['type'],
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
182 extra={C.MESS_KEY_ATTACHMENTS: [attachment]},
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
183 )
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
184
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
185 if ((not data['extra']
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
186 and (not data['message'] or data['message'] == {'': ''})
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
187 and not data['subject'])):
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
188 # nothing left to send, we can cancel the message
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
189 raise exceptions.CancelError("Cancelled by AESGCM attachment handling")
2ba602aef90e plugin attach, aesgcm: attachments refactoring:
Goffi <goffi@goffi.org>
parents: 3205
diff changeset
190
3090
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
191 def onDataDownload(self, data, client, file_obj, decryptor):
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
192 if file_obj.tell() + len(data) > file_obj.size:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
193 # we're reaching end of file with this bunch of data
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
194 # we may still have a last bunch if the tag is incomplete
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
195 bytes_left = file_obj.size - file_obj.tell()
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
196 if bytes_left > 0:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
197 decrypted = decryptor.update(data[:bytes_left])
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
198 file_obj.write(decrypted)
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
199 tag = data[bytes_left:]
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
200 else:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
201 tag = data
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
202 if len(tag) < 16:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
203 # the tag is incomplete, either we'll get the rest in next data bunch
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
204 # or we have already the other part from last bunch of data
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
205 try:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
206 # we store partial tag in decryptor._sat_tag
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
207 tag = decryptor._sat_tag + tag
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
208 except AttributeError:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
209 # no other part, we'll get the rest at next bunch
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
210 decryptor.sat_tag = tag
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
211 else:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
212 # we have the complete tag, it must be 128 bits
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
213 if len(tag) != 16:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
214 raise ValueError(f"Invalid tag: {tag}")
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
215 remain = decryptor.finalize_with_tag(tag)
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
216 file_obj.write(remain)
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
217 file_obj.close()
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
218 else:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
219 decrypted = decryptor.update(data)
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
220 file_obj.write(decrypted)
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
221
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
222 def _uploadSizeTrigger(self, client, options, file_path, size, size_adjust):
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
223 if options.get('encryption') != C.ENC_AES_GCM:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
224 return True
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
225 # the tag is appended to the file
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
226 size_adjust.append(16)
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
227 return True
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
228
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
229 def _encrypt(self, data, encryptor):
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
230 if data:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
231 return encryptor.update(data)
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
232 else:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
233 try:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
234 # end of file is reached, me must finalize
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
235 ret = encryptor.finalize()
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
236 tag = encryptor.tag
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
237 return ret + tag
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
238 except AlreadyFinalized:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
239 # as we have already finalized, we can now send EOF
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
240 return b''
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
241
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
242 def _uploadTrigger(self, client, options, sat_file, file_producer, slot):
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
243 if options.get('encryption') != C.ENC_AES_GCM:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
244 return True
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
245 log.debug("encrypting file with AES-GCM")
3178
98b321234068 plugin aesgcm: use 12 bytes Initialisation Vector:
Goffi <goffi@goffi.org>
parents: 3174
diff changeset
246 iv = secrets.token_bytes(12)
3090
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
247 key = secrets.token_bytes(32)
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
248 fragment = f'{iv.hex()}{key.hex()}'
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
249 ori_url = parse.urlparse(slot.get)
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
250 # we change the get URL with the one with aesgcm scheme and containing the
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
251 # encoded key + iv
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
252 slot.get = parse.urlunparse(['aesgcm', *ori_url[1:5], fragment])
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
253
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
254 # encrypted data size will be bigger than original file size
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
255 # so we need to check with final data length to avoid a warning on close()
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
256 sat_file.check_size_with_read = True
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
257
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
258 # file_producer get length directly from file, and this cause trouble has
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
259 # we have to change the size because of encryption. So we adapt it here,
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
260 # else the producer would stop reading prematurely
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
261 file_producer.length = sat_file.size
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
262
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
263 encryptor = ciphers.Cipher(
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
264 ciphers.algorithms.AES(key),
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
265 modes.GCM(iv),
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
266 backend=backends.default_backend(),
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
267 ).encryptor()
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
268
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
269 if sat_file.data_cb is not None:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
270 raise exceptions.InternalError(
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
271 f"data_cb was expected to be None, it is set to {sat_file.data_cb}")
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
272
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
273 # with data_cb we encrypt the file on the fly
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
274 sat_file.data_cb = partial(self._encrypt, encryptor=encryptor)
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
275 return True
3174
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
276
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
277
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
278 def _popAESGCMLinks(self, match, links):
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
279 link = match.group()
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
280 if link not in links:
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
281 links.append(link)
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
282 return ""
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
283
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
284 def _checkAESGCMAttachments(self, client, data):
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
285 if not data.get('message'):
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
286 return data
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
287 links = []
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
288
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
289 for lang, message in list(data['message'].items()):
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
290 message = AESGCM_RE.sub(
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
291 partial(self._popAESGCMLinks, links=links),
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
292 message)
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
293 if links:
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
294 message = message.strip()
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
295 if not message:
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
296 del data['message'][lang]
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
297 else:
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
298 data['message'][lang] = message
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
299 mess_encrypted = client.encryption.isEncrypted(data)
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
300 attachments = data['extra'].setdefault(C.MESS_KEY_ATTACHMENTS, [])
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
301 for link in links:
3186
84b0c8b4dee0 plugin download, aesgcm: fixed handling of HTTP errors
Goffi <goffi@goffi.org>
parents: 3178
diff changeset
302 path = parse.urlparse(link).path
3174
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
303 attachment = {
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
304 "url": link,
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
305 }
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
306 media_type = mimetypes.guess_type(path, strict=False)[0]
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
307 if media_type is not None:
3196
adf1aeaa0d37 core (constants): renamed `MESS_KEY_MEDIA_TYPE` to `MESS_KEY_ATTACHMENTS_MEDIA_TYPE`
Goffi <goffi@goffi.org>
parents: 3186
diff changeset
308 attachment[C.MESS_KEY_ATTACHMENTS_MEDIA_TYPE] = media_type
3174
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
309
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
310 if mess_encrypted:
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
311 # we don't add the encrypted flag if the message itself is not
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
312 # encrypted, because the decryption key is part of the link,
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
313 # so sending it over unencrypted channel is like having no
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
314 # encryption at all.
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
315 attachment['encrypted'] = True
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
316 attachments.append(attachment)
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
317
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
318 return data
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
319
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
320 def _messageReceivedTrigger(self, client, message_elt, post_treat):
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
321 # we use a post_treat callback instead of "message_parse" trigger because we need
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
322 # to check if the "encrypted" flag is set to decide if we add the same flag to the
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
323 # attachment
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
324 post_treat.addCallback(partial(self._checkAESGCMAttachments, client))
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
325 return True