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annotate sat/core/patches.py @ 2750:ae495f27b316

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plugin XEP-0380: Explicit Message Encryption implementation
author Goffi <goffi@goffi.org>
date Fri, 04 Jan 2019 11:14:53 +0100
parents 1ecceac3df96
children 00d905e1b0ef
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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parents: 2687
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1 from twisted.words.protocols.jabber import xmlstream, sasl, client as tclient
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2 from twisted.internet import ssl
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3 from wokkel import client
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4 from sat.core.constants import Const as C
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5 from sat.core.log import getLogger
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6
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7 log = getLogger(__name__)
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8
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9 """This module apply monkey patches to Twisted and Wokkel
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10 First part handle certificate validation during XMPP connectionand are temporary
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11 (until merged upstream).
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12 Second part add a trigger point to send and onElement method of XmlStream
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13 """
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14
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15
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16 ## certificate validation patches
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17
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18 class TLSInitiatingInitializer(xmlstream.TLSInitiatingInitializer):
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19 check_certificate = True
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20
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21 def onProceed(self, obj):
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22 self.xmlstream.removeObserver('/failure', self.onFailure)
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23 trustRoot = ssl.platformTrust() if self.check_certificate else None
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24 ctx = ssl.CertificateOptions(trustRoot=trustRoot)
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25 self.xmlstream.transport.startTLS(ctx)
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26 self.xmlstream.reset()
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27 self.xmlstream.sendHeader()
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28 self._deferred.callback(xmlstream.Reset)
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29
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30
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31 class XMPPClient(client.XMPPClient):
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32
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33 def __init__(self, jid, password, host=None, port=5222,
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34 check_certificate=True):
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35 self.jid = jid
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36 self.domain = jid.host.encode('idna')
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37 self.host = host
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38 self.port = port
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39
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40 factory = HybridClientFactory(
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41 jid, password, check_certificate=check_certificate)
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42
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43 client.StreamManager.__init__(self, factory)
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44
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45
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46 def HybridClientFactory(jid, password, check_certificate=True):
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47 a = HybridAuthenticator(jid, password, check_certificate)
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48
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49 return xmlstream.XmlStreamFactory(a)
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50
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51
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52 class HybridAuthenticator(client.HybridAuthenticator):
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53 res_binding = True
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54
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55 def __init__(self, jid, password, check_certificate):
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56 xmlstream.ConnectAuthenticator.__init__(self, jid.host)
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57 self.jid = jid
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58 self.password = password
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59 self.check_certificate = check_certificate
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60
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61 def associateWithStream(self, xs):
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62 xmlstream.ConnectAuthenticator.associateWithStream(self, xs)
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63
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64 tlsInit = xmlstream.TLSInitiatingInitializer(xs)
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65 tlsInit.check_certificate = self.check_certificate
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66 xs.initializers = [client.client.CheckVersionInitializer(xs),
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67 tlsInit,
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68 CheckAuthInitializer(xs, self.res_binding)]
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69
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70
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71 # XmlStream triggers
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72
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73
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74 class XmlStream(xmlstream.XmlStream):
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75 """XmlStream which allows to add hooks"""
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76
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77 def __init__(self, authenticator):
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78 xmlstream.XmlStream.__init__(self, authenticator)
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79 # hooks at this level should not modify content
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80 # so it's not needed to handle priority as with triggers
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81 self._onElementHooks = []
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82 self._sendHooks = []
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83
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84 def addHook(self, hook_type, callback):
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85 """Add a send or receive hook"""
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86 conflict_msg = (u"Hook conflict: can't add {hook_type} hook {callback}"
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87 .format(hook_type=hook_type, callback=callback))
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88 if hook_type == C.STREAM_HOOK_RECEIVE:
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89 if callback not in self._onElementHooks:
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90 self._onElementHooks.append(callback)
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91 else:
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92 log.warning(conflict_msg)
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93 elif hook_type == C.STREAM_HOOK_SEND:
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94 if callback not in self._sendHooks:
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95 self._sendHooks.append(callback)
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96 else:
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97 log.warning(conflict_msg)
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98 else:
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99 raise ValueError(u"Invalid hook type: {hook_type}"
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100 .format(hook_type=hook_type))
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101
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102 def onElement(self, element):
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103 for hook in self._onElementHooks:
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104 hook(element)
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105 xmlstream.XmlStream.onElement(self, element)
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106
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107 def send(self, obj):
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108 for hook in self._sendHooks:
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109 hook(obj)
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110 xmlstream.XmlStream.send(self, obj)
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111
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112
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113 # Binding activation (needed for stream management, XEP-0198)
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114
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115
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116 class CheckAuthInitializer(client.CheckAuthInitializer):
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117
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118 def __init__(self, xs, res_binding):
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119 super(CheckAuthInitializer, self).__init__(xs)
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120 self.res_binding = res_binding
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121
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122 def initialize(self):
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123 # XXX: modification of client.CheckAuthInitializer which has optional
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124 # resource binding, and which doesn't do deprecated
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125 # SessionInitializer
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126 if (sasl.NS_XMPP_SASL, 'mechanisms') in self.xmlstream.features:
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127 inits = [(sasl.SASLInitiatingInitializer, True)]
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128 if self.res_binding:
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129 inits.append((tclient.BindInitializer, True)),
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130
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131 for initClass, required in inits:
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132 init = initClass(self.xmlstream)
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133 init.required = required
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134 self.xmlstream.initializers.append(init)
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135 elif (tclient.NS_IQ_AUTH_FEATURE, 'auth') in self.xmlstream.features:
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136 self.xmlstream.initializers.append(
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137 tclient.IQAuthInitializer(self.xmlstream))
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138 else:
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139 raise Exception("No available authentication method found")
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Goffi <goffi@goffi.org>
parents:
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140
e9cd473a2f46 core (xmpp): server certificate validation:
Goffi <goffi@goffi.org>
parents:
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141
e9cd473a2f46 core (xmpp): server certificate validation:
Goffi <goffi@goffi.org>
parents:
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142 def apply():
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1ecceac3df96 plugin XEP-0198: Stream Management implementation:
Goffi <goffi@goffi.org>
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143 # certificate validation
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Goffi <goffi@goffi.org>
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144 xmlstream.TLSInitiatingInitializer = TLSInitiatingInitializer
e9cd473a2f46 core (xmpp): server certificate validation:
Goffi <goffi@goffi.org>
parents:
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145 client.XMPPClient = XMPPClient
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1ecceac3df96 plugin XEP-0198: Stream Management implementation:
Goffi <goffi@goffi.org>
parents: 2687
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146 # XmlStream triggers
1ecceac3df96 plugin XEP-0198: Stream Management implementation:
Goffi <goffi@goffi.org>
parents: 2687
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147 xmlstream.XmlStreamFactory.protocol = XmlStream