prosody
23c6ce0e3f20
plugins/mod_dialback.lua

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plugins/mod_dialback.lua @ 3702:23c6ce0e3f20

Merge with Zash
author Matthew Wild <mwild1@gmail.com>
date Mon, 06 Dec 2010 17:32:35 +0000
parent 3651:337391d34b70
child 4238:05f991b4a90e
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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 local hosts = _G.hosts;
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11 local send_s2s = require "core.s2smanager".send_to_host;
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12 local s2s_make_authenticated = require "core.s2smanager".make_authenticated;
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13 local s2s_initiate_dialback = require "core.s2smanager".initiate_dialback;
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14 local s2s_verify_dialback = require "core.s2smanager".verify_dialback;
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15 local s2s_destroy_session = require "core.s2smanager".destroy_session;
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16
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17 local log = module._log;
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18
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19 local st = require "util.stanza";
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20
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21 local xmlns_stream = "http://etherx.jabber.org/streams";
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22 local xmlns_dialback = "jabber:server:dialback";
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23
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24 local dialback_requests = setmetatable({}, { __mode = 'v' });
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25
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26 module:hook("stanza/jabber:server:dialback:verify", function(event)
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27 local origin, stanza = event.origin, event.stanza;
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28
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29 if origin.type == "s2sin_unauthed" or origin.type == "s2sin" then
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30 -- We are being asked to verify the key, to ensure it was generated by us
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31 origin.log("debug", "verifying that dialback key is ours...");
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32 local attr = stanza.attr;
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33 -- COMPAT: Grr, ejabberd breaks this one too?? it is black and white in XEP-220 example 34
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34 --if attr.from ~= origin.to_host then error("invalid-from"); end
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35 local type;
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36 if s2s_verify_dialback(attr.id, attr.from, attr.to, stanza[1]) then
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37 type = "valid"
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38 else
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39 type = "invalid"
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40 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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41 end
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42 origin.log("debug", "verified dialback key... it is %s", type);
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43 origin.sends2s(st.stanza("db:verify", { from = attr.to, to = attr.from, id = attr.id, type = type }):text(stanza[1]));
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44 return true;
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45 end
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46 end);
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47
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48 module:hook("stanza/jabber:server:dialback:result", function(event)
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49 local origin, stanza = event.origin, event.stanza;
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50
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51 if origin.type == "s2sin_unauthed" or origin.type == "s2sin" then
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52 -- he wants to be identified through dialback
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53 -- We need to check the key with the Authoritative server
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54 local attr = stanza.attr;
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55 origin.hosts[attr.from] = { dialback_key = stanza[1] };
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56
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57 if not hosts[attr.to] then
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58 -- Not a host that we serve
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59 origin.log("info", "%s tried to connect to %s, which we don't serve", attr.from, attr.to);
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60 origin:close("host-unknown");
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61 return true;
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62 end
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63
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64 dialback_requests[attr.from] = origin;
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65
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66 if not origin.from_host then
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67 -- Just used for friendlier logging
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68 origin.from_host = attr.from;
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69 end
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70 if not origin.to_host then
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71 -- Just used for friendlier logging
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72 origin.to_host = attr.to;
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73 end
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74
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75 origin.log("debug", "asking %s if key %s belongs to them", attr.from, stanza[1]);
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76 send_s2s(attr.to, attr.from,
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77 st.stanza("db:verify", { from = attr.to, to = attr.from, id = origin.streamid }):text(stanza[1]));
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78 return true;
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79 end
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80 end);
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81
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82 module:hook("stanza/jabber:server:dialback:verify", function(event)
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83 local origin, stanza = event.origin, event.stanza;
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84
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85 if origin.type == "s2sout_unauthed" or origin.type == "s2sout" then
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86 local attr = stanza.attr;
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87 local dialback_verifying = dialback_requests[attr.from];
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88 if dialback_verifying then
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89 local valid;
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90 if attr.type == "valid" then
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91 s2s_make_authenticated(dialback_verifying, attr.from);
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92 valid = "valid";
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93 else
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94 -- Warn the original connection that is was not verified successfully
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95 log("warn", "authoritative server for "..(attr.from or "(unknown)").." denied the key");
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96 valid = "invalid";
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97 end
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98 if not dialback_verifying.sends2s then
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99 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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100 else
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101 dialback_verifying.sends2s(
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102 st.stanza("db:result", { from = attr.to, to = attr.from, id = attr.id, type = valid })
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103 :text(dialback_verifying.hosts[attr.from].dialback_key));
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104 end
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105 dialback_requests[attr.from] = nil;
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106 end
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107 return true;
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108 end
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109 end);
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110
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111 module:hook("stanza/jabber:server:dialback:result", function(event)
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112 local origin, stanza = event.origin, event.stanza;
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113
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114 if origin.type == "s2sout_unauthed" or origin.type == "s2sout" then
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115 -- Remote server is telling us whether we passed dialback
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116
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117 local attr = stanza.attr;
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118 if not hosts[attr.to] then
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119 origin:close("host-unknown");
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120 return true;
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121 elseif hosts[attr.to].s2sout[attr.from] ~= origin then
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122 -- This isn't right
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123 origin:close("invalid-id");
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124 return true;
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125 end
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126 if stanza.attr.type == "valid" then
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127 s2s_make_authenticated(origin, attr.from);
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128 else
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129 s2s_destroy_session(origin)
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130 end
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131 return true;
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132 end
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133 end);
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134
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135 module:hook_stanza("urn:ietf:params:xml:ns:xmpp-sasl", "failure", function (origin, stanza)
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136 if origin.external_auth == "failed" then
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137 module:log("debug", "SASL EXTERNAL failed, falling back to dialback");
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138 s2s_initiate_dialback(origin);
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139 return true;
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140 end
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141 end, 100);
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142
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143 module:hook_stanza(xmlns_stream, "features", function (origin, stanza)
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144 if not origin.external_auth or origin.external_auth == "failed" then
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145 s2s_initiate_dialback(origin);
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146 return true;
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147 end
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148 end, 100);
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149
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150 -- Offer dialback to incoming hosts
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151 module:hook("s2s-stream-features", function (data)
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152 data.features:tag("dialback", { xmlns='urn:xmpp:features:dialback' }):tag("optional"):up():up();
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153 end);