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annotate sat/plugins/plugin_sec_pubsub_signing.py @ 4048:04e21d6c9188

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plugin XEP-0320: Use of DTLS-SRTP in Jingle Sessions: rel 421
author Goffi <goffi@goffi.org>
date Mon, 15 May 2023 17:02:40 +0200
parents 524856bd7b19
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
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1 #!/usr/bin/env python3
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2
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3 # Libervia plugin for Pubsub Items Signature
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4 # Copyright (C) 2009-2022 Jérôme Poisson (goffi@goffi.org)
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5
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6 # This program is free software: you can redistribute it and/or modify
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7 # it under the terms of the GNU Affero General Public License as published by
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8 # the Free Software Foundation, either version 3 of the License, or
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9 # (at your option) any later version.
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10
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11 # This program is distributed in the hope that it will be useful,
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 # GNU Affero General Public License for more details.
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15
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16 # You should have received a copy of the GNU Affero General Public License
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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18
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19 import base64
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20 import time
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21 from typing import Any, Dict, List, Optional
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22
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23 from lxml import etree
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24 import shortuuid
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25 from twisted.internet import defer
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26 from twisted.words.protocols.jabber import jid, xmlstream
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27 from twisted.words.xish import domish
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28 from wokkel import disco, iwokkel
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29 from wokkel import pubsub
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30 from zope.interface import implementer
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31
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32 from sat.core import exceptions
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33 from sat.core.constants import Const as C
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34 from sat.core.core_types import SatXMPPEntity
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35 from sat.core.i18n import _
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36 from sat.core.log import getLogger
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37 from sat.tools import utils
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38 from sat.tools.common import data_format
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39
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40 from .plugin_xep_0373 import VerificationFailed
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41
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42
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43 log = getLogger(__name__)
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44
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45 IMPORT_NAME = "pubsub-signing"
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46
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47 PLUGIN_INFO = {
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48 C.PI_NAME: "Pubsub Signing",
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49 C.PI_IMPORT_NAME: IMPORT_NAME,
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50 C.PI_TYPE: C.PLUG_TYPE_XEP,
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51 C.PI_MODES: C.PLUG_MODE_BOTH,
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52 C.PI_PROTOCOLS: [],
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53 C.PI_DEPENDENCIES: ["XEP-0060", "XEP-0373", "XEP-0470"],
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54 C.PI_MAIN: "PubsubSigning",
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55 C.PI_HANDLER: "yes",
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56 C.PI_DESCRIPTION: _(
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57 """Pubsub Signature can be used to strongly authenticate a pubsub item"""
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58 ),
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59 }
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60 NS_PUBSUB_SIGNING = "urn:xmpp:pubsub-signing:0"
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61 NS_PUBSUB_SIGNING_OPENPGP = "urn:xmpp:pubsub-signing:openpgp:0"
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62
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63
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64 class PubsubSigning:
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65 namespace = NS_PUBSUB_SIGNING
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66
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67 def __init__(self, host):
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68 log.info(_("Pubsub Signing plugin initialization"))
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69 host.register_namespace("pubsub-signing", NS_PUBSUB_SIGNING)
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70 self.host = host
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71 self._p = host.plugins["XEP-0060"]
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72 self._ox = host.plugins["XEP-0373"]
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73 self._a = host.plugins["XEP-0470"]
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74 self._a.register_attachment_handler(
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75 "signature", NS_PUBSUB_SIGNING, self.signature_get, self.signature_set
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76 )
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77 host.trigger.add("XEP-0060_publish", self._publish_trigger)
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78 host.bridge.add_method(
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79 "ps_signature_check",
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80 ".plugin",
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81 in_sign="sssss",
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82 out_sign="s",
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83 method=self._check,
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84 async_=True,
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85 )
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86
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87 def get_handler(self, client):
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88 return PubsubSigning_Handler()
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89
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90 def get_data_to_sign(
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91 self,
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92 item_elt: domish.Element,
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93 to_jid: jid.JID,
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94 timestamp: float,
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95 signer: str,
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96 ) -> bytes:
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97 """Generate the wrapper element, normalize, serialize and return it"""
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98 # we remove values which must not be in the serialised data
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99 item_id = item_elt.attributes.pop("id")
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100 item_publisher = item_elt.attributes.pop("publisher", None)
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101 item_parent = item_elt.parent
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102
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103 # we need to be sure that item element namespace is right
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104 item_elt.uri = item_elt.defaultUri = pubsub.NS_PUBSUB
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105
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106 sign_data_elt = domish.Element((NS_PUBSUB_SIGNING, "sign-data"))
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107 to_elt = sign_data_elt.addElement("to")
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108 to_elt["jid"] = to_jid.userhost()
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109 time_elt = sign_data_elt.addElement("time")
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110 time_elt["stamp"] = utils.xmpp_date(timestamp)
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111 sign_data_elt.addElement("signer", content=signer)
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112 sign_data_elt.addChild(item_elt)
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113 # FIXME: xml_tools.domish_elt_2_et_elt must be used once implementation is
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114 # complete. For now serialisation/deserialisation is more secure.
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115 # et_sign_data_elt = xml_tools.domish_elt_2_et_elt(sign_data_elt, True)
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116 et_sign_data_elt = etree.fromstring(sign_data_elt.toXml())
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117 to_sign = etree.tostring(
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118 et_sign_data_elt,
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119 method="c14n2",
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120 with_comments=False,
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121 strip_text=True
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122 )
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123 # the data to sign is serialised, we cna restore original values
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124 item_elt["id"] = item_id
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125 if item_publisher is not None:
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126 item_elt["publisher"] = item_publisher
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127 item_elt.parent = item_parent
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128 return to_sign
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129
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130 def _check(
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131 self,
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132 service: str,
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133 node: str,
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134 item_id: str,
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135 signature_data_s: str,
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136 profile_key: str,
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137 ) -> defer.Deferred:
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138 d = defer.ensureDeferred(
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
139 self.check(
4037
524856bd7b19 massive refactoring to switch from camelCase to snake_case:
Goffi <goffi@goffi.org>
parents: 3963
diff changeset
140 self.host.get_client(profile_key),
3956
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
141 jid.JID(service),
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
142 node,
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
143 item_id,
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
144 data_format.deserialise(signature_data_s)
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
145 )
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
146 )
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
147 d.addCallback(data_format.serialise)
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
148 return d
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
149
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
150 async def check(
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
151 self,
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
152 client: SatXMPPEntity,
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
153 service: jid.JID,
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
154 node: str,
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
155 item_id: str,
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
156 signature_data: Dict[str, Any],
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
157 ) -> Dict[str, Any]:
4037
524856bd7b19 massive refactoring to switch from camelCase to snake_case:
Goffi <goffi@goffi.org>
parents: 3963
diff changeset
158 items, __ = await self._p.get_items(
3956
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
159 client, service, node, item_ids=[item_id]
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
160 )
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
161 if not items != 1:
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
162 raise exceptions.NotFound(
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
163 f"target item not found for {item_id!r} at {node!r} for {service}"
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
164 )
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
165 item_elt = items[0]
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
166 timestamp = signature_data["timestamp"]
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
167 signers = signature_data["signers"]
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
168 if not signers:
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
169 raise ValueError("we must have at least one signer to check the signature")
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
170 if len(signers) > 1:
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
171 raise NotImplemented("multiple signers are not supported yet")
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
172 signer = jid.JID(signers[0])
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
173 signature = base64.b64decode(signature_data["signature"])
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
174 verification_keys = {
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
175 k for k in await self._ox.import_all_public_keys(client, signer)
3961
a15c171836bb plugin pubsub signing: fix `gpg_provider` instanciation:
Goffi <goffi@goffi.org>
parents: 3956
diff changeset
176 if client.gpg_provider.can_sign(k)
3956
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
177 }
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
178 signed_data = self.get_data_to_sign(item_elt, service, timestamp, signer.full())
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
179 try:
3961
a15c171836bb plugin pubsub signing: fix `gpg_provider` instanciation:
Goffi <goffi@goffi.org>
parents: 3956
diff changeset
180 client.gpg_provider.verify_detached(signed_data, signature, verification_keys)
3956
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
181 except VerificationFailed:
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
182 validated = False
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
183 else:
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
184 validated = True
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
185
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
186 trusts = {
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
187 k.fingerprint: (await self._ox.get_trust(client, k, signer)).value.lower()
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
188 for k in verification_keys
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
189 }
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
190 return {
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
191 "signer": signer.full(),
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
192 "validated": validated,
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
193 "trusts": trusts,
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
194 }
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
195
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
196 def signature_get(
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
197 self,
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
198 client: SatXMPPEntity,
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
199 attachments_elt: domish.Element,
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
200 data: Dict[str, Any],
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
201 ) -> None:
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
202 try:
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
203 signature_elt = next(
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
204 attachments_elt.elements(NS_PUBSUB_SIGNING, "signature")
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
205 )
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
206 except StopIteration:
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
207 pass
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
208 else:
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
209 time_elts = list(signature_elt.elements(NS_PUBSUB_SIGNING, "time"))
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
210 if len(time_elts) != 1:
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
211 raise exceptions.DataError("only a single <time/> element is allowed")
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
212 try:
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
213 timestamp = utils.parse_xmpp_date(time_elts[0]["stamp"])
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
214 except (KeyError, exceptions.ParsingError):
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
215 raise exceptions.DataError(
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
216 "invalid time element: {signature_elt.toXml()}"
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
217 )
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
218
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
219 signature_data: Dict[str, Any] = {
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
220 "timestamp": timestamp,
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
221 "signers": [
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
222 str(s) for s in signature_elt.elements(NS_PUBSUB_SIGNING, "signer")
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
223 ]
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
224 }
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
225 # FIXME: only OpenPGP signature is available for now, to be updated if and
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
226 # when more algorithms are available.
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
227 sign_elt = next(
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
228 signature_elt.elements(NS_PUBSUB_SIGNING_OPENPGP, "sign"),
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
229 None
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
230 )
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
231 if sign_elt is None:
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
232 log.warning(
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
233 "no known signature profile element found, ignoring signature: "
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
234 f"{signature_elt.toXml()}"
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
235 )
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
236 return
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
237 else:
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
238 signature_data["signature"] = str(sign_elt)
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
239
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
240 data["signature"] = signature_data
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
241
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
242 async def signature_set(
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
243 self,
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
244 client: SatXMPPEntity,
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
245 attachments_data: Dict[str, Any],
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
246 former_elt: Optional[domish.Element]
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
247 ) -> Optional[domish.Element]:
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
248 signature_data = attachments_data["extra"].get("signature")
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
249 if signature_data is None:
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
250 return former_elt
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
251 elif signature_data:
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
252 item_elt = signature_data.get("item_elt")
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
253 service = jid.JID(attachments_data["service"])
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
254 if item_elt is None:
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
255 node = attachments_data["node"]
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
256 item_id = attachments_data["id"]
4037
524856bd7b19 massive refactoring to switch from camelCase to snake_case:
Goffi <goffi@goffi.org>
parents: 3963
diff changeset
257 items, __ = await self._p.get_items(
3963
d105ead599b6 plugin pubsub signature: fix attachment setting + default signer:
Goffi <goffi@goffi.org>
parents: 3961
diff changeset
258 client, service, node, item_ids=[item_id]
3956
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
259 )
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
260 if not items != 1:
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
261 raise exceptions.NotFound(
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
262 f"target item not found for {item_id!r} at {node!r} for {service}"
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
263 )
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
264 item_elt = items[0]
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
265
3963
d105ead599b6 plugin pubsub signature: fix attachment setting + default signer:
Goffi <goffi@goffi.org>
parents: 3961
diff changeset
266 signer = signature_data.get("signer") or client.jid.userhost()
3956
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
267 timestamp = time.time()
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
268 timestamp_xmpp = utils.xmpp_date(timestamp)
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
269 to_sign = self.get_data_to_sign(item_elt, service, timestamp, signer)
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
270
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
271 signature_elt = domish.Element(
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
272 (NS_PUBSUB_SIGNING, "signature"),
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
273 )
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
274 time_elt = signature_elt.addElement("time")
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
275 time_elt["stamp"] = timestamp_xmpp
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
276 signature_elt.addElement("signer", content=signer)
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
277
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
278 sign_elt = signature_elt.addElement((NS_PUBSUB_SIGNING_OPENPGP, "sign"))
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
279 signing_keys = {
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
280 k for k in self._ox.list_secret_keys(client)
3961
a15c171836bb plugin pubsub signing: fix `gpg_provider` instanciation:
Goffi <goffi@goffi.org>
parents: 3956
diff changeset
281 if client.gpg_provider.can_sign(k.public_key)
3956
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
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282 }
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283 # the base64 encoded signature itself
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284 sign_elt.addContent(
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285 base64.b64encode(
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a15c171836bb plugin pubsub signing: fix `gpg_provider` instanciation:
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parents: 3956
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286 client.gpg_provider.sign_detached(to_sign, signing_keys)
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287 ).decode()
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288 )
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289 return signature_elt
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290 else:
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291 return None
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292
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293 async def _publish_trigger(
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294 self,
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295 client: SatXMPPEntity,
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296 service: jid.JID,
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297 node: str,
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298 items: Optional[List[domish.Element]],
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299 options: Optional[dict],
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300 sender: jid.JID,
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301 extra: Dict[str, Any]
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302 ) -> bool:
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Goffi <goffi@goffi.org>
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303 if not items or not extra.get("signed"):
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304 return True
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305
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306 for item_elt in items:
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307 # we need an ID to find corresponding attachment node, and so to sign an item
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308 if not item_elt.hasAttribute("id"):
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309 item_elt["id"] = shortuuid.uuid()
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310 await self._a.set_attachements(
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311 client,
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312 {
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313 "service": service.full(),
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314 "node": node,
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315 "id": item_elt["id"],
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316 "extra": {
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Goffi <goffi@goffi.org>
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317 "signature": {
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318 "item_elt": item_elt,
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319 "signer": sender.userhost(),
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320 }
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Goffi <goffi@goffi.org>
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321 }
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
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322 }
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
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323 )
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Goffi <goffi@goffi.org>
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324
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325 return True
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326
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Goffi <goffi@goffi.org>
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327
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Goffi <goffi@goffi.org>
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328 @implementer(iwokkel.IDisco)
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329 class PubsubSigning_Handler(xmlstream.XMPPHandler):
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330
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
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331 def getDiscoInfo(self, requestor, service, nodeIdentifier=""):
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Goffi <goffi@goffi.org>
parents:
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332 return [disco.DiscoFeature(NS_PUBSUB_SIGNING)]
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
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333
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
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334 def getDiscoItems(self, requestor, service, nodeIdentifier=""):
3cb9ade2ab84 plugin pubsub signing: pubsub items signature implementation:
Goffi <goffi@goffi.org>
parents:
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335 return []