prosody
cd8d1cacc65b
plugins/mod_saslauth.lua

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plugins/mod_saslauth.lua @ 3548:cd8d1cacc65b

mod_saslauth: Handle SASL <abort/> properly.
author Waqas Hussain <waqas20@gmail.com>
date Tue, 02 Nov 2010 15:07:25 +0500
parent 3535:b953b0c0f203
child 3551:4fba723ab235
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rev   line source
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
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b1885732e979 GPL->MIT!
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9
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10
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11 local st = require "util.stanza";
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12 local sm_bind_resource = require "core.sessionmanager".bind_resource;
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13 local sm_make_authenticated = require "core.sessionmanager".make_authenticated;
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14 local base64 = require "util.encodings".base64;
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15
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16 local nodeprep = require "util.encodings".stringprep.nodeprep;
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17 local usermanager_get_sasl_handler = require "core.usermanager".get_sasl_handler;
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18 local t_concat, t_insert = table.concat, table.insert;
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19 local tostring = tostring;
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20
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21 local secure_auth_only = module:get_option("c2s_require_encryption") or module:get_option("require_encryption");
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22 local anonymous_login = module:get_option("anonymous_login");
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23 local allow_unencrypted_plain_auth = module:get_option("allow_unencrypted_plain_auth")
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24
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25 local log = module._log;
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26
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27 local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl';
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28 local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind';
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29 local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas';
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31 local new_sasl = require "util.sasl".new;
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33 local anonymous_authentication_profile = {
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34 anonymous = function(username, realm)
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35 return true; -- for normal usage you should always return true here
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36 end
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37 };
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39 local function build_reply(status, ret, err_msg)
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40 local reply = st.stanza(status, {xmlns = xmlns_sasl});
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41 if status == "challenge" then
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42 --log("debug", "CHALLENGE: %s", ret or "");
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43 reply:text(base64.encode(ret or ""));
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44 elseif status == "failure" then
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45 reply:tag(ret):up();
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46 if err_msg then reply:tag("text"):text(err_msg); end
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47 elseif status == "success" then
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48 --log("debug", "SUCCESS: %s", ret or "");
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49 reply:text(base64.encode(ret or ""));
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50 else
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51 module:log("error", "Unknown sasl status: %s", status);
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52 end
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53 return reply;
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54 end
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55
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56 local function handle_status(session, status, ret, err_msg)
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57 if status == "failure" then
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58 session.sasl_handler = session.sasl_handler:clean_clone();
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59 elseif status == "success" then
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60 local username = nodeprep(session.sasl_handler.username);
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61
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62 local ok, err = sm_make_authenticated(session, session.sasl_handler.username);
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63 if ok then
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64 session.sasl_handler = nil;
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65 session:reset_stream();
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66 else
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67 module:log("warn", "SASL succeeded but username was invalid");
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68 session.sasl_handler = session.sasl_handler:clean_clone();
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69 return "failure", "not-authorized", "User authenticated successfully, but username was invalid";
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70 end
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71 end
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72 return status, ret, err_msg;
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73 end
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74
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75 local function sasl_handler(event)
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76 local session, stanza = event.origin, event.stanza;
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77 if session.type ~= "c2s_unauthed" then return; end
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78
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79 if stanza.name == "auth" then
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80 -- FIXME ignoring duplicates because ejabberd does
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81 local mechanism = stanza.attr.mechanism;
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82 if anonymous_login then
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83 if mechanism ~= "ANONYMOUS" then
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84 session.send(build_reply("failure", "invalid-mechanism"));
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85 return true;
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86 end
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87 elseif mechanism == "ANONYMOUS" then
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88 session.send(build_reply("failure", "mechanism-too-weak"));
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89 return true;
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90 end
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91 if not session.secure and (secure_auth_only or (mechanism == "PLAIN" and not allow_unencrypted_plain_auth)) then
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92 session.send(build_reply("failure", "encryption-required"));
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93 return true;
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94 end
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95 local valid_mechanism = session.sasl_handler:select(mechanism);
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96 if not valid_mechanism then
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97 session.send(build_reply("failure", "invalid-mechanism"));
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98 return true;
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99 end
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100 elseif not session.sasl_handler then
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101 return true; -- FIXME ignoring out of order stanzas because ejabberd does
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102 end
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103 local text = stanza[1];
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104 if text then
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105 text = base64.decode(text);
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106 --log("debug", "AUTH: %s", text:gsub("[%z\001-\008\011\012\014-\031]", " "));
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107 if not text then
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108 session.sasl_handler = nil;
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109 session.send(build_reply("failure", "incorrect-encoding"));
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110 return true;
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111 end
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112 end
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113 local status, ret, err_msg = session.sasl_handler:process(text);
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114 status, ret, err_msg = handle_status(session, status, ret, err_msg);
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115 local s = build_reply(status, ret, err_msg);
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116 log("debug", "sasl reply: %s", tostring(s));
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117 session.send(s);
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118 return true;
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119 end
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120
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121 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:auth", sasl_handler);
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122 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:response", sasl_handler);
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123 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:abort", function(event)
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124 local session = event.origin;
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125 session.sasl_handler = nil;
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126 session.send(build_reply("failure", "aborted"));
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127 return true;
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128 end);
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129
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130 local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' };
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131 local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' };
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132 local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' };
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133 module:hook("stream-features", function(event)
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134 local origin, features = event.origin, event.features;
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135 if not origin.username then
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136 if secure_auth_only and not origin.secure then
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137 return;
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138 end
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139 if anonymous_login then
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140 origin.sasl_handler = new_sasl(module.host, anonymous_authentication_profile);
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141 else
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142 origin.sasl_handler = usermanager_get_sasl_handler(module.host);
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143 end
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144 features:tag("mechanisms", mechanisms_attr);
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145 for mechanism in pairs(origin.sasl_handler:mechanisms()) do
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146 if mechanism ~= "PLAIN" or origin.secure or allow_unencrypted_plain_auth then
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147 features:tag("mechanism"):text(mechanism):up();
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148 end
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149 end
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150 features:up();
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151 else
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152 features:tag("bind", bind_attr):tag("required"):up():up();
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153 features:tag("session", xmpp_session_attr):tag("optional"):up():up();
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154 end
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155 end);
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156
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157 module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-bind:bind", function(event)
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158 local origin, stanza = event.origin, event.stanza;
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159 local resource;
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160 if stanza.attr.type == "set" then
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161 local bind = stanza.tags[1];
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162 resource = bind:child_with_name("resource");
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163 resource = resource and #resource.tags == 0 and resource[1] or nil;
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164 end
3523
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165 local success, err_type, err, err_msg = sm_bind_resource(origin, resource);
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166 if success then
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167 origin.send(st.reply(stanza)
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168 :tag("bind", { xmlns = xmlns_bind })
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169 :tag("jid"):text(origin.full_jid));
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170 origin.log("debug", "Resource bound: %s", origin.full_jid);
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171 else
3523
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172 origin.send(st.error_reply(stanza, err_type, err, err_msg));
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173 origin.log("debug", "Resource bind failed: %s", err_msg or err);
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174 end
3523
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175 return true;
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176 end);
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diff changeset
177
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178 module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-session:session", function(event)
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179 event.origin.send(st.reply(event.stanza));
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180 return true;
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181 end);