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annotate sat/plugins/plugin_sec_aesgcm.py @ 3137:559a625a236b

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author Goffi <goffi@goffi.org>
date Wed, 29 Jan 2020 10:07:00 +0100
parents 9d0df638c8b4
children c90f27ce52b0
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1 #!/usr/bin/env python3
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2
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3 # SAT 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 from textwrap import dedent
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20 from functools import partial
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21 import secrets
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22 from cryptography.hazmat.primitives import ciphers
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23 from cryptography.hazmat.primitives.ciphers import modes
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24 from cryptography.hazmat import backends
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25 from cryptography.exceptions import AlreadyFinalized
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26 from urllib import parse
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27 import treq
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28 from sat.core.i18n import _
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29 from sat.core.constants import Const as C
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30 from sat.core import exceptions
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31 from sat.tools import stream
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32 from sat.core.log import getLogger
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33
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34 log = getLogger(__name__)
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35
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36 PLUGIN_INFO = {
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37 C.PI_NAME: "AES-GCM",
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38 C.PI_IMPORT_NAME: "AES-GCM",
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39 C.PI_TYPE: "SEC",
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40 C.PI_PROTOCOLS: ["OMEMO Media sharing"],
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41 C.PI_DEPENDENCIES: ["XEP-0363", "XEP-0384", "DOWNLOAD"],
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42 C.PI_MAIN: "AESGCM",
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43 C.PI_HANDLER: "no",
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44 C.PI_DESCRIPTION: dedent(_("""\
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45 Implementation of AES-GCM scheme, a way to encrypt files (not official XMPP standard).
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46 See https://xmpp.org/extensions/inbox/omemo-media-sharing.html for details
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47 """)),
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48 }
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49
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50
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51 class AESGCM(object):
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52
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53 def __init__(self, host):
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54 self.host = host
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55 log.info(_("AESGCM plugin initialization"))
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56 host.plugins["DOWNLOAD"].registerScheme(
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57 "aesgcm", self.download
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58 )
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59 host.trigger.add("XEP-0363_upload_size", self._uploadSizeTrigger)
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60 host.trigger.add("XEP-0363_upload", self._uploadTrigger)
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61
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62 async def download(self, client, uri_parsed, dest_path, options):
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63 fragment = bytes.fromhex(uri_parsed.fragment)
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64
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65 # legacy method use 16 bits IV, but OMEMO media sharing published spec indicates
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66 # which is 12 bits IV (AES-GCM spec recommandation), so we have to determine
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67 # which size has been used.
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68 if len(fragment) == 48:
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69 iv_size = 16
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70 elif len(fragment) == 44:
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71 iv_size = 12
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72 else:
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73 raise ValueError(
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74 f"Invalid URL fragment, can't decrypt file at {uri_parsed.get_url()}")
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75
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76 iv, key = fragment[:iv_size], fragment[iv_size:]
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77
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78 decryptor = ciphers.Cipher(
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79 ciphers.algorithms.AES(key),
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80 modes.GCM(iv),
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81 backend=backends.default_backend(),
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82 ).decryptor()
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83
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84 download_url = parse.urlunparse(
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85 ('https', uri_parsed.netloc, uri_parsed.path, '', '', ''))
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86
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87 head_data = await treq.head(download_url)
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88 content_length = int(head_data.headers.getRawHeaders('content-length')[0])
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89 # the 128 bits tag is put at the end
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90 file_size = content_length - 16
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91
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92 file_obj = stream.SatFile(
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93 self.host,
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94 client,
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95 dest_path,
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96 mode="wb",
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97 size = file_size,
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98 )
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99
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100 progress_id = file_obj.uid
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101
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102 resp = await treq.get(download_url, unbuffered=True)
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103 d = treq.collect(resp, partial(
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104 self.onDataDownload,
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105 client=client,
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106 file_obj=file_obj,
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107 decryptor=decryptor))
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108 return progress_id, d
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109
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110 def onDataDownload(self, data, client, file_obj, decryptor):
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111 if file_obj.tell() + len(data) > file_obj.size:
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112 # we're reaching end of file with this bunch of data
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113 # 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
114 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
115 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
116 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
117 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
118 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
119 else:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
120 tag = data
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
121 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
122 # 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
123 # 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
124 try:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
125 # 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
126 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
127 except AttributeError:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
128 # 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
129 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
130 else:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
131 # 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
132 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
133 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
134 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
135 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
136 file_obj.close()
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
137 else:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
138 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
139 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
140
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
141 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
142 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
143 return True
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
144 # 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
145 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
146 return True
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
147
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
148 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
149 if data:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
150 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
151 else:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
152 try:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
153 # 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
154 ret = encryptor.finalize()
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
155 tag = encryptor.tag
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
156 return ret + tag
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
157 except AlreadyFinalized:
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
158 # 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
159 return b''
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
160
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
161 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
162 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
163 return True
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
164 log.debug("encrypting file with AES-GCM")
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
165 # specification talks about 12 bytes IV, but in practice and for legacy reasons
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
166 # 16 bytes are used by most clients (and also in the specification example).
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
167 # It seems that some clients don't handle 12 bytes IV (apparently,
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
168 # that's the case for ChatSecure).
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
169 # So we have to follow the de-facto standard and use 16 bytes to be sure
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
170 # to be compatible with a maximum of clients.
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
171 iv = secrets.token_bytes(16)
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
172 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
173 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
174 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
175 # 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
176 # encoded key + iv
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
177 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
178
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
179 # 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
180 # 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
181 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
182
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
183 # 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
184 # 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
185 # 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
186 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
187
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
188 encryptor = ciphers.Cipher(
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
189 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
190 modes.GCM(iv),
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
191 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
192 ).encryptor()
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 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
195 raise exceptions.InternalError(
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
196 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
197
4f8bdf50593f plugin sec aesgcm: new plugin handling `aesgcm:` scheme for e2e encrypted media sharing:
Goffi <goffi@goffi.org>
parents:
diff changeset
198 # 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
199 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
200 return True