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annotate sat/core/patches.py @ 3162:b5c058c7692e

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core (xmpp), plugin android: fixed DNS, SRV handling on Android: Android doesn't have a "/etc/resolv.conf" that Twisted expect. As a result, SRV records can't be checked correctly on connection. To work around that, DNS servers used on Android are checked when necessary (on Android plugin startup and on connectivity change), using some hacks, and Twisted is patched to use them.
author Goffi <goffi@goffi.org>
date Sun, 09 Feb 2020 23:56:42 +0100
parents 691283719bb2
children 524856bd7b19
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rev   line source
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1 import copy
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2 from twisted.words.protocols.jabber import xmlstream, sasl, client as tclient, jid
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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 applies 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
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19 class XMPPClient(client.XMPPClient):
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20
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21 def __init__(self, jid, password, host=None, port=5222,
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22 tls_required=True, configurationForTLS=None):
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23 self.jid = jid
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24 self.domain = jid.host.encode('idna')
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25 self.host = host
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26 self.port = port
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27
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28 factory = HybridClientFactory(
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29 jid, password, tls_required=tls_required,
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30 configurationForTLS=configurationForTLS)
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31
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32 client.StreamManager.__init__(self, factory)
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33
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34
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35 def HybridClientFactory(jid, password, tls_required=True, configurationForTLS=None):
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36 a = HybridAuthenticator(jid, password, tls_required, configurationForTLS)
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37
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38 return xmlstream.XmlStreamFactory(a)
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39
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40
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41 class HybridAuthenticator(client.HybridAuthenticator):
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42 res_binding = True
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43
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44 def __init__(self, jid, password, tls_required=True, configurationForTLS=None):
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45 xmlstream.ConnectAuthenticator.__init__(self, jid.host)
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46 self.jid = jid
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47 self.password = password
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48 self.tls_required = tls_required
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49 self.configurationForTLS = configurationForTLS
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50
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51 def associateWithStream(self, xs):
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52 xmlstream.ConnectAuthenticator.associateWithStream(self, xs)
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53
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54 tlsInit = xmlstream.TLSInitiatingInitializer(
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55 xs, required=self.tls_required, configurationForTLS=self.configurationForTLS)
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56 xs.initializers = [client.client.CheckVersionInitializer(xs),
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57 tlsInit,
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58 CheckAuthInitializer(xs, self.res_binding)]
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59
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60
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61 # XmlStream triggers
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62
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63
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64 class XmlStream(xmlstream.XmlStream):
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65 """XmlStream which allows to add hooks"""
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66
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67 def __init__(self, authenticator):
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68 xmlstream.XmlStream.__init__(self, authenticator)
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69 # hooks at this level should not modify content
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70 # so it's not needed to handle priority as with triggers
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71 self._onElementHooks = []
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72 self._sendHooks = []
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73
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74 def addHook(self, hook_type, callback):
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75 """Add a send or receive hook"""
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76 conflict_msg = f"Hook conflict: can't add {hook_type} hook {callback}"
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77 if hook_type == C.STREAM_HOOK_RECEIVE:
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78 if callback not in self._onElementHooks:
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79 self._onElementHooks.append(callback)
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80 else:
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81 log.warning(conflict_msg)
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82 elif hook_type == C.STREAM_HOOK_SEND:
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83 if callback not in self._sendHooks:
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84 self._sendHooks.append(callback)
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85 else:
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86 log.warning(conflict_msg)
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87 else:
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88 raise ValueError(f"Invalid hook type: {hook_type}")
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89
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90 def onElement(self, element):
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91 for hook in self._onElementHooks:
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92 hook(element)
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93 xmlstream.XmlStream.onElement(self, element)
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94
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95 def send(self, obj):
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96 for hook in self._sendHooks:
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97 hook(obj)
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98 xmlstream.XmlStream.send(self, obj)
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99
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100
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101 # Binding activation (needed for stream management, XEP-0198)
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102
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103
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104 class CheckAuthInitializer(client.CheckAuthInitializer):
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105
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106 def __init__(self, xs, res_binding):
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107 super(CheckAuthInitializer, self).__init__(xs)
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108 self.res_binding = res_binding
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109
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110 def initialize(self):
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111 # XXX: modification of client.CheckAuthInitializer which has optional
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112 # resource binding, and which doesn't do deprecated
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113 # SessionInitializer
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114 if (sasl.NS_XMPP_SASL, 'mechanisms') in self.xmlstream.features:
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115 inits = [(sasl.SASLInitiatingInitializer, True)]
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116 if self.res_binding:
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117 inits.append((tclient.BindInitializer, True)),
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118
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119 for initClass, required in inits:
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120 init = initClass(self.xmlstream)
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121 init.required = required
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122 self.xmlstream.initializers.append(init)
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123 elif (tclient.NS_IQ_AUTH_FEATURE, 'auth') in self.xmlstream.features:
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124 self.xmlstream.initializers.append(
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125 tclient.IQAuthInitializer(self.xmlstream))
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126 else:
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127 raise Exception("No available authentication method found")
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128
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129
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130 # jid fix
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131
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132 def internJID(jidstring):
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133 """
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134 Return interned JID.
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135
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136 @rtype: L{JID}
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137 """
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138 # XXX: this interJID return a copy of the cached jid
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139 # this avoid modification of cached jid as JID is mutable
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140 # TODO: propose this upstream
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141
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142 if jidstring in jid.__internJIDs:
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143 return copy.copy(jid.__internJIDs[jidstring])
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144 else:
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145 j = jid.JID(jidstring)
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146 jid.__internJIDs[jidstring] = j
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147 return copy.copy(j)
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148
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149
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150 def apply():
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151 # certificate validation
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152 client.XMPPClient = XMPPClient
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153 # XmlStream triggers
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154 xmlstream.XmlStreamFactory.protocol = XmlStream
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155 # jid fix
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156 jid.internJID = internJID