annotate sat/plugins/plugin_sec_aesgcm.py @ 3191:7255286a298a

memory (sqlite): don't store empty messages
author Goffi <goffi@goffi.org>
date Wed, 26 Feb 2020 22:03:15 +0100
parents 84b0c8b4dee0
children adf1aeaa0d37
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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
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37 log = getLogger(__name__)
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38
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39 PLUGIN_INFO = {
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40 C.PI_NAME: "AES-GCM",
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41 C.PI_IMPORT_NAME: "AES-GCM",
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42 C.PI_TYPE: "SEC",
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43 C.PI_PROTOCOLS: ["OMEMO Media sharing"],
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44 C.PI_DEPENDENCIES: ["XEP-0363", "XEP-0384", "DOWNLOAD"],
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45 C.PI_MAIN: "AESGCM",
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46 C.PI_HANDLER: "no",
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47 C.PI_DESCRIPTION: dedent(_("""\
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48 Implementation of AES-GCM scheme, a way to encrypt files (not official XMPP standard).
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49 See https://xmpp.org/extensions/inbox/omemo-media-sharing.html for details
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50 """)),
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51 }
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52
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53 AESGCM_RE = re.compile(
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54 r'aesgcm:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9'
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55 r'()@:%_\+.~#?&\/\/=]*)')
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56
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57
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58 class AESGCM(object):
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59
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60 def __init__(self, host):
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61 self.host = host
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62 log.info(_("AESGCM plugin initialization"))
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63 host.plugins["DOWNLOAD"].registerScheme(
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64 "aesgcm", self.download
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65 )
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66 host.trigger.add("XEP-0363_upload_size", self._uploadSizeTrigger)
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67 host.trigger.add("XEP-0363_upload", self._uploadTrigger)
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68 host.trigger.add("messageReceived", self._messageReceivedTrigger)
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69
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70 async def download(self, client, uri_parsed, dest_path, options):
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71 fragment = bytes.fromhex(uri_parsed.fragment)
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72
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73 # legacy method use 16 bits IV, but OMEMO media sharing published spec indicates
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74 # which is 12 bits IV (AES-GCM spec recommandation), so we have to determine
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75 # which size has been used.
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76 if len(fragment) == 48:
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77 iv_size = 16
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78 elif len(fragment) == 44:
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79 iv_size = 12
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80 else:
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81 raise ValueError(
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82 f"Invalid URL fragment, can't decrypt file at {uri_parsed.get_url()}")
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83
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84 iv, key = fragment[:iv_size], fragment[iv_size:]
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85
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86 decryptor = ciphers.Cipher(
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87 ciphers.algorithms.AES(key),
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88 modes.GCM(iv),
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89 backend=backends.default_backend(),
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90 ).decryptor()
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91
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92 download_url = parse.urlunparse(
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93 ('https', uri_parsed.netloc, uri_parsed.path, '', '', ''))
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94
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95 head_data = await treq.head(download_url)
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96 content_length = int(head_data.headers.getRawHeaders('content-length')[0])
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97 # the 128 bits tag is put at the end
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98 file_size = content_length - 16
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99
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100 file_obj = stream.SatFile(
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101 self.host,
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102 client,
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103 dest_path,
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104 mode="wb",
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105 size = file_size,
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106 )
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107
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108 progress_id = file_obj.uid
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109
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110 resp = await treq.get(download_url, unbuffered=True)
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111 if resp.code == 200:
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112 d = treq.collect(resp, partial(
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113 self.onDataDownload,
84b0c8b4dee0 plugin download, aesgcm: fixed handling of HTTP errors
Goffi <goffi@goffi.org>
parents: 3178
diff changeset
114 client=client,
84b0c8b4dee0 plugin download, aesgcm: fixed handling of HTTP errors
Goffi <goffi@goffi.org>
parents: 3178
diff changeset
115 file_obj=file_obj,
84b0c8b4dee0 plugin download, aesgcm: fixed handling of HTTP errors
Goffi <goffi@goffi.org>
parents: 3178
diff changeset
116 decryptor=decryptor))
84b0c8b4dee0 plugin download, aesgcm: fixed handling of HTTP errors
Goffi <goffi@goffi.org>
parents: 3178
diff changeset
117 else:
84b0c8b4dee0 plugin download, aesgcm: fixed handling of HTTP errors
Goffi <goffi@goffi.org>
parents: 3178
diff changeset
118 d = defer.Deferred()
84b0c8b4dee0 plugin download, aesgcm: fixed handling of HTTP errors
Goffi <goffi@goffi.org>
parents: 3178
diff changeset
119 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
120 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
121
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
122 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
123 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
124 # 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
125 # 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
126 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
127 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
128 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
129 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
130 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
131 else:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
132 tag = data
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
133 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
134 # 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
135 # 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
136 try:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
137 # 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
138 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
139 except AttributeError:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
140 # 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
141 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
142 else:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
143 # 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
144 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
145 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
146 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
147 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
148 file_obj.close()
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
149 else:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
150 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
151 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
152
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
153 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
154 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
155 return True
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
156 # 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
157 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
158 return True
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
159
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
160 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
161 if data:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
162 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
163 else:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
164 try:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
165 # 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
166 ret = encryptor.finalize()
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
167 tag = encryptor.tag
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
168 return ret + tag
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
169 except AlreadyFinalized:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
170 # 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
171 return b''
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
172
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
173 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
174 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
175 return True
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
176 log.debug("encrypting file with AES-GCM")
3178
98b321234068 plugin aesgcm: use 12 bytes Initialisation Vector:
Goffi <goffi@goffi.org>
parents: 3174
diff changeset
177 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
178 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
179 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
180 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
181 # 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
182 # encoded key + iv
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
183 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
184
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
185 # 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
186 # 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
187 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
188
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
189 # 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
190 # 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
191 # 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
192 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
193
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
194 encryptor = ciphers.Cipher(
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
195 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
196 modes.GCM(iv),
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
197 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
198 ).encryptor()
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
199
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
200 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
201 raise exceptions.InternalError(
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
202 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
203
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
204 # 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
205 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
206 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
207
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
208
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
209 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
210 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
211 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
212 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
213 return ""
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
214
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
215 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
216 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
217 return data
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
218 links = []
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
219
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
220 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
221 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
222 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
223 message)
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
224 if links:
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
225 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
226 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
227 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
228 else:
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
229 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
230 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
231 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
232 for link in links:
3186
84b0c8b4dee0 plugin download, aesgcm: fixed handling of HTTP errors
Goffi <goffi@goffi.org>
parents: 3178
diff changeset
233 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
234 attachment = {
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
235 "url": link,
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
236 }
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
237 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
238 if media_type is not None:
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
239 attachment[C.MESS_KEY_MEDIA_TYPE] = media_type
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
240
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
241 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
242 # 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
243 # 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
244 # 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
245 # 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
246 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
247 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
248
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
249 return data
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
250
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
251 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
252 # 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
253 # 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
254 # attachment
c90f27ce52b0 plugin aesgcm: look for "aesgcm" links in body to use them as attachments
Goffi <goffi@goffi.org>
parents: 3136
diff changeset
255 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
256 return True