prosody
7a4f00168260
plugins/mod_dialback.lua

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plugins/mod_dialback.lua @ 4931:7a4f00168260

mod_dialback: Skip an unnecessary nameprep.
author Waqas Hussain <waqas20@gmail.com>
date Fri, 15 Jun 2012 02:53:57 +0500
parent 4851:8e3992ae7bf5
child 4993:5243b74a4cbb
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 local hosts = _G.hosts;
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10 local s2s_make_authenticated = require "core.s2smanager".make_authenticated;
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11
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12 local log = module._log;
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13
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14 local st = require "util.stanza";
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15 local sha256_hash = require "util.hashes".sha256;
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16 local nameprep = require "util.encodings".stringprep.nameprep;
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17
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18 local xmlns_stream = "http://etherx.jabber.org/streams";
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19
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20 local dialback_requests = setmetatable({}, { __mode = 'v' });
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21
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22 function generate_dialback(id, to, from)
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23 return sha256_hash(id..to..from..hosts[from].dialback_secret, true);
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24 end
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25
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26 function initiate_dialback(session)
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27 -- generate dialback key
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28 session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host);
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29 session.sends2s(st.stanza("db:result", { from = session.from_host, to = session.to_host }):text(session.dialback_key));
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30 session.log("info", "sent dialback key on outgoing s2s stream");
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31 end
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32
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33 function verify_dialback(id, to, from, key)
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34 return key == generate_dialback(id, to, from);
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35 end
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36
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37 module:hook("stanza/jabber:server:dialback:verify", function(event)
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38 local origin, stanza = event.origin, event.stanza;
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39
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40 if origin.type == "s2sin_unauthed" or origin.type == "s2sin" then
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41 -- We are being asked to verify the key, to ensure it was generated by us
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42 origin.log("debug", "verifying that dialback key is ours...");
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43 local attr = stanza.attr;
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44 -- COMPAT: Grr, ejabberd breaks this one too?? it is black and white in XEP-220 example 34
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45 --if attr.from ~= origin.to_host then error("invalid-from"); end
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46 local type;
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47 if verify_dialback(attr.id, attr.from, attr.to, stanza[1]) then
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48 type = "valid"
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49 else
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50 type = "invalid"
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51 origin.log("warn", "Asked to verify a dialback key that was incorrect. An imposter is claiming to be %s?", attr.to);
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52 end
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53 origin.log("debug", "verified dialback key... it is %s", type);
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54 origin.sends2s(st.stanza("db:verify", { from = attr.to, to = attr.from, id = attr.id, type = type }):text(stanza[1]));
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55 return true;
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56 end
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57 end);
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58
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59 module:hook("stanza/jabber:server:dialback:result", function(event)
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60 local origin, stanza = event.origin, event.stanza;
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61
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62 if origin.type == "s2sin_unauthed" or origin.type == "s2sin" then
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63 -- he wants to be identified through dialback
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64 -- We need to check the key with the Authoritative server
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65 local attr = stanza.attr;
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66 local to, from = nameprep(attr.to), nameprep(attr.from);
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67
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68 if not hosts[to] then
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69 -- Not a host that we serve
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70 origin.log("info", "%s tried to connect to %s, which we don't serve", from, to);
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71 origin:close("host-unknown");
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72 return true;
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73 elseif not from then
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74 origin:close("improper-addressing");
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75 end
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76
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77 origin.hosts[from] = { dialback_key = stanza[1] };
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78
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79 dialback_requests[from.."/"..origin.streamid] = origin;
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80
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81 -- COMPAT: ejabberd, gmail and perhaps others do not always set 'to' and 'from'
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82 -- on streams. We fill in the session's to/from here instead.
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83 if not origin.from_host then
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84 origin.from_host = from;
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85 end
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86 if not origin.to_host then
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87 origin.to_host = to;
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88 end
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89
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90 origin.log("debug", "asking %s if key %s belongs to them", from, stanza[1]);
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91 module:fire_event("route/remote", {
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92 from_host = to, to_host = from;
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93 stanza = st.stanza("db:verify", { from = to, to = from, id = origin.streamid }):text(stanza[1]);
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94 });
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95 return true;
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96 end
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97 end);
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98
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99 module:hook("stanza/jabber:server:dialback:verify", function(event)
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100 local origin, stanza = event.origin, event.stanza;
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101
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102 if origin.type == "s2sout_unauthed" or origin.type == "s2sout" then
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103 local attr = stanza.attr;
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104 local dialback_verifying = dialback_requests[attr.from.."/"..(attr.id or "")];
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105 module:log("debug", tostring(dialback_verifying).." "..attr.from.." "..origin.to_host);
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106 if dialback_verifying and attr.from == origin.to_host then
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107 local valid;
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108 if attr.type == "valid" then
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109 s2s_make_authenticated(dialback_verifying, attr.from);
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110 valid = "valid";
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111 else
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112 -- Warn the original connection that is was not verified successfully
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113 log("warn", "authoritative server for "..(attr.from or "(unknown)").." denied the key");
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114 valid = "invalid";
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115 end
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116 if not dialback_verifying.sends2s then
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117 log("warn", "Incoming s2s session %s was closed in the meantime, so we can't notify it of the db result", tostring(dialback_verifying):match("%w+$"));
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118 else
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119 dialback_verifying.sends2s(
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120 st.stanza("db:result", { from = attr.to, to = attr.from, id = attr.id, type = valid })
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121 :text(dialback_verifying.hosts[attr.from].dialback_key));
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122 end
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123 dialback_requests[attr.from.."/"..(attr.id or "")] = nil;
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124 end
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125 return true;
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126 end
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127 end);
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128
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129 module:hook("stanza/jabber:server:dialback:result", function(event)
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130 local origin, stanza = event.origin, event.stanza;
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131
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132 if origin.type == "s2sout_unauthed" or origin.type == "s2sout" then
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133 -- Remote server is telling us whether we passed dialback
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134
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135 local attr = stanza.attr;
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136 if not hosts[attr.to] then
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137 origin:close("host-unknown");
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138 return true;
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139 elseif hosts[attr.to].s2sout[attr.from] ~= origin then
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140 -- This isn't right
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141 origin:close("invalid-id");
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142 return true;
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143 end
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144 if stanza.attr.type == "valid" then
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145 s2s_make_authenticated(origin, attr.from);
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146 else
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147 origin:close("not-authorized", "dialback authentication failed");
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148 end
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149 return true;
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150 end
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151 end);
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152
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153 module:hook_stanza("urn:ietf:params:xml:ns:xmpp-sasl", "failure", function (origin, stanza)
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154 if origin.external_auth == "failed" then
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155 module:log("debug", "SASL EXTERNAL failed, falling back to dialback");
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156 initiate_dialback(origin);
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157 return true;
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158 end
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159 end, 100);
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160
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161 module:hook_stanza(xmlns_stream, "features", function (origin, stanza)
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162 if not origin.external_auth or origin.external_auth == "failed" then
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163 module:log("debug", "Initiating dialback...");
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164 initiate_dialback(origin);
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165 return true;
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166 end
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167 end, 100);
1937
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parents: 1876
diff changeset
168
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parents: 4584
diff changeset
169 module:hook("s2s-authenticate-legacy", function (event)
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170 module:log("debug", "Initiating dialback...");
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parents: 4579
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171 initiate_dialback(event.origin);
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172 return true;
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173 end, 100);
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parents: 4579
diff changeset
174
1937
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175 -- Offer dialback to incoming hosts
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176 module:hook("s2s-stream-features", function (data)
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parents: 4238
diff changeset
177 data.features:tag("dialback", { xmlns='urn:xmpp:features:dialback' }):up();
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178 end);