prosody
72cd7a785014
plugins/mod_saslauth.lua

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plugins/mod_saslauth.lua @ 3464:72cd7a785014

mod_saslauth: Get rid of the sasl_backend option (use auth modules instead).
author Waqas Hussain <waqas20@gmail.com>
date Mon, 23 Aug 2010 16:28:06 +0500
parent 3463:1644ab13a4ca
child 3468:d50e2c937717
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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diff changeset
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 usermanager_user_exists = require "core.usermanager".user_exists;
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19 local t_concat, t_insert = table.concat, table.insert;
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20 local tostring = tostring;
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21
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22 local secure_auth_only = module:get_option("c2s_require_encryption") or module:get_option("require_encryption");
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23 local anonymous_login = module:get_option("anonymous_login");
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24 local allow_unencrypted_plain_auth = module:get_option("allow_unencrypted_plain_auth")
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26 -- Cyrus config options
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27 local require_provisioning = module:get_option("cyrus_require_provisioning") or false;
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29 local log = module._log;
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30
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31 local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl';
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32 local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind';
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33 local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas';
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35 local new_sasl = require "util.sasl".new;
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37 local anonymous_authentication_profile = {
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38 anonymous = function(username, realm)
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39 return true; -- for normal usage you should always return true here
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40 end
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41 };
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42
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43 local function build_reply(status, ret, err_msg)
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44 local reply = st.stanza(status, {xmlns = xmlns_sasl});
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45 if status == "challenge" then
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46 --log("debug", "CHALLENGE: %s", ret or "");
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47 reply:text(base64.encode(ret or ""));
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48 elseif status == "failure" then
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49 reply:tag(ret):up();
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50 if err_msg then reply:tag("text"):text(err_msg); end
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51 elseif status == "success" then
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52 --log("debug", "SUCCESS: %s", ret or "");
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53 reply:text(base64.encode(ret or ""));
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54 else
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55 module:log("error", "Unknown sasl status: %s", status);
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56 end
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57 return reply;
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58 end
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59
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60 local function handle_status(session, status, ret, err_msg)
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61 if status == "failure" then
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62 session.sasl_handler = session.sasl_handler:clean_clone();
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63 elseif status == "success" then
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64 local username = nodeprep(session.sasl_handler.username);
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65
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66 if not(require_provisioning) or usermanager_user_exists(username, session.host) then
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67 local ok, err = sm_make_authenticated(session, session.sasl_handler.username);
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68 if ok then
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69 session.sasl_handler = nil;
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70 session:reset_stream();
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71 else
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72 module:log("warn", "SASL succeeded but username was invalid");
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73 session.sasl_handler = session.sasl_handler:clean_clone();
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74 return "failure", "not-authorized", "User authenticated successfully, but username was invalid";
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75 end
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76 else
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77 module:log("warn", "SASL succeeded but we don't have an account provisioned for %s", username);
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78 session.sasl_handler = session.sasl_handler:clean_clone();
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79 return "failure", "not-authorized", "User authenticated successfully, but not provisioned for XMPP";
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80 end
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81 end
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82 return status, ret, err_msg;
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83 end
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84
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85 local function sasl_handler(session, stanza)
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86 if stanza.name == "auth" then
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87 -- FIXME ignoring duplicates because ejabberd does
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88 local mechanism = stanza.attr.mechanism;
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89 if anonymous_login then
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90 if mechanism ~= "ANONYMOUS" then
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91 return session.send(build_reply("failure", "invalid-mechanism"));
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92 end
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93 elseif mechanism == "ANONYMOUS" then
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94 return session.send(build_reply("failure", "mechanism-too-weak"));
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95 end
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96 if not session.secure and (secure_auth_only or (mechanism == "PLAIN" and not allow_unencrypted_plain_auth)) then
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97 return session.send(build_reply("failure", "encryption-required"));
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98 end
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99 local valid_mechanism = session.sasl_handler:select(mechanism);
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100 if not valid_mechanism then
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101 return session.send(build_reply("failure", "invalid-mechanism"));
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102 end
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103 elseif not session.sasl_handler then
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104 return; -- FIXME ignoring out of order stanzas because ejabberd does
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105 end
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106 local text = stanza[1];
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107 if text then
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108 text = base64.decode(text);
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109 --log("debug", "AUTH: %s", text:gsub("[%z\001-\008\011\012\014-\031]", " "));
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110 if not text then
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111 session.sasl_handler = nil;
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112 session.send(build_reply("failure", "incorrect-encoding"));
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113 return;
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114 end
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115 end
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116 local status, ret, err_msg = session.sasl_handler:process(text);
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117 status, ret, err_msg = handle_status(session, status, ret, err_msg);
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118 local s = build_reply(status, ret, err_msg);
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119 log("debug", "sasl reply: %s", tostring(s));
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120 session.send(s);
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121 end
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122
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123 module:add_handler("c2s_unauthed", "auth", xmlns_sasl, sasl_handler);
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124 module:add_handler("c2s_unauthed", "abort", xmlns_sasl, sasl_handler);
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125 module:add_handler("c2s_unauthed", "response", xmlns_sasl, sasl_handler);
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126
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127 local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' };
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128 local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' };
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129 local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' };
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130 module:hook("stream-features", function(event)
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131 local origin, features = event.origin, event.features;
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132 if not origin.username then
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133 if secure_auth_only and not origin.secure then
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134 return;
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135 end
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136 if anonymous_login then
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137 origin.sasl_handler = new_sasl(module.host, anonymous_authentication_profile);
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138 else
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139 origin.sasl_handler = usermanager_get_sasl_handler(module.host);
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140 end
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141 features:tag("mechanisms", mechanisms_attr);
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142 for mechanism in pairs(origin.sasl_handler:mechanisms()) do
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143 if mechanism ~= "PLAIN" or origin.secure or allow_unencrypted_plain_auth then
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144 features:tag("mechanism"):text(mechanism):up();
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145 end
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146 end
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147 features:up();
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148 else
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149 features:tag("bind", bind_attr):tag("required"):up():up();
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150 features:tag("session", xmpp_session_attr):tag("optional"):up():up();
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151 end
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152 end);
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153
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154 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind", function(session, stanza)
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155 log("debug", "Client requesting a resource bind");
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156 local resource;
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157 if stanza.attr.type == "set" then
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158 local bind = stanza.tags[1];
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159 if bind and bind.attr.xmlns == xmlns_bind then
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160 resource = bind:child_with_name("resource");
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161 if resource then
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162 resource = resource[1];
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d6b3f9dbb624 Resource binding, XMPP sessions (whatever they're for...)
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163 end
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164 end
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165 end
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166 local success, err_type, err, err_msg = sm_bind_resource(session, resource);
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167 if not success then
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168 session.send(st.error_reply(stanza, err_type, err, err_msg));
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169 else
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170 session.send(st.reply(stanza)
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171 :tag("bind", { xmlns = xmlns_bind})
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172 :tag("jid"):text(session.full_jid));
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173 end
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174 end);
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175
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176 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session", function(session, stanza)
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177 log("debug", "Client requesting a session");
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178 session.send(st.reply(stanza));
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179 end);