prosody
2928a74357c8
plugins/mod_dialback.lua

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plugins/mod_dialback.lua @ 4410:2928a74357c8

Makefile: Fix making of prosody.version
author Kim Alvefur <zash@zash.se>
date Sun, 23 Oct 2011 20:56:33 +0200
parent 4316:2478698bdc52
child 4567:24617f360200
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
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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
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16 local log = module._log;
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17
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18 local st = require "util.stanza";
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19
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20 local xmlns_stream = "http://etherx.jabber.org/streams";
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21 local xmlns_dialback = "jabber:server:dialback";
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22
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23 local dialback_requests = setmetatable({}, { __mode = 'v' });
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24
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25 module:hook("stanza/jabber:server:dialback:verify", function(event)
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26 local origin, stanza = event.origin, event.stanza;
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27
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28 if origin.type == "s2sin_unauthed" or origin.type == "s2sin" then
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29 -- We are being asked to verify the key, to ensure it was generated by us
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30 origin.log("debug", "verifying that dialback key is ours...");
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31 local attr = stanza.attr;
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32 -- COMPAT: Grr, ejabberd breaks this one too?? it is black and white in XEP-220 example 34
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33 --if attr.from ~= origin.to_host then error("invalid-from"); end
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34 local type;
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35 if s2s_verify_dialback(attr.id, attr.from, attr.to, stanza[1]) then
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36 type = "valid"
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37 else
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38 type = "invalid"
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39 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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40 end
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41 origin.log("debug", "verified dialback key... it is %s", type);
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42 origin.sends2s(st.stanza("db:verify", { from = attr.to, to = attr.from, id = attr.id, type = type }):text(stanza[1]));
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43 return true;
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44 end
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45 end);
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46
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47 module:hook("stanza/jabber:server:dialback:result", function(event)
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48 local origin, stanza = event.origin, event.stanza;
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49
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50 if origin.type == "s2sin_unauthed" or origin.type == "s2sin" then
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51 -- he wants to be identified through dialback
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52 -- We need to check the key with the Authoritative server
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53 local attr = stanza.attr;
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54 origin.hosts[attr.from] = { dialback_key = stanza[1] };
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55
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56 if not hosts[attr.to] then
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57 -- Not a host that we serve
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58 origin.log("info", "%s tried to connect to %s, which we don't serve", attr.from, attr.to);
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59 origin:close("host-unknown");
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60 return true;
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61 end
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62
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63 dialback_requests[attr.from.."/"..origin.streamid] = origin;
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64
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65 if not origin.from_host then
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66 -- Just used for friendlier logging
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67 origin.from_host = attr.from;
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68 end
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69 if not origin.to_host then
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70 -- Just used for friendlier logging
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71 origin.to_host = attr.to;
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72 end
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73
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74 origin.log("debug", "asking %s if key %s belongs to them", attr.from, stanza[1]);
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75 send_s2s(attr.to, attr.from,
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76 st.stanza("db:verify", { from = attr.to, to = attr.from, id = origin.streamid }):text(stanza[1]));
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77 return true;
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78 end
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79 end);
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80
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81 module:hook("stanza/jabber:server:dialback:verify", function(event)
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82 local origin, stanza = event.origin, event.stanza;
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83
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84 if origin.type == "s2sout_unauthed" or origin.type == "s2sout" then
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85 local attr = stanza.attr;
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86 local dialback_verifying = dialback_requests[attr.from.."/"..(attr.id or "")];
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87 if dialback_verifying and attr.from == origin.to_host then
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88 local valid;
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89 if attr.type == "valid" then
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90 s2s_make_authenticated(dialback_verifying, attr.from);
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91 valid = "valid";
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92 else
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93 -- Warn the original connection that is was not verified successfully
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94 log("warn", "authoritative server for "..(attr.from or "(unknown)").." denied the key");
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95 valid = "invalid";
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96 end
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97 if not dialback_verifying.sends2s then
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98 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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99 else
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100 dialback_verifying.sends2s(
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101 st.stanza("db:result", { from = attr.to, to = attr.from, id = attr.id, type = valid })
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102 :text(dialback_verifying.hosts[attr.from].dialback_key));
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103 end
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104 dialback_requests[attr.from.."/"..(attr.id or "")] = nil;
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105 end
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106 return true;
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107 end
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108 end);
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109
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110 module:hook("stanza/jabber:server:dialback:result", function(event)
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111 local origin, stanza = event.origin, event.stanza;
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112
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113 if origin.type == "s2sout_unauthed" or origin.type == "s2sout" then
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114 -- Remote server is telling us whether we passed dialback
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115
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116 local attr = stanza.attr;
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117 if not hosts[attr.to] then
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118 origin:close("host-unknown");
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119 return true;
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120 elseif hosts[attr.to].s2sout[attr.from] ~= origin then
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121 -- This isn't right
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122 origin:close("invalid-id");
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123 return true;
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124 end
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125 if stanza.attr.type == "valid" then
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126 s2s_make_authenticated(origin, attr.from);
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127 else
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128 origin:close("not-authorized", "dialback authentication failed");
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129 end
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130 return true;
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131 end
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132 end);
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133
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134 module:hook_stanza("urn:ietf:params:xml:ns:xmpp-sasl", "failure", function (origin, stanza)
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135 if origin.external_auth == "failed" then
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136 module:log("debug", "SASL EXTERNAL failed, falling back to dialback");
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137 s2s_initiate_dialback(origin);
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138 return true;
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139 end
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140 end, 100);
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141
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142 module:hook_stanza(xmlns_stream, "features", function (origin, stanza)
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143 if not origin.external_auth or origin.external_auth == "failed" then
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144 s2s_initiate_dialback(origin);
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145 return true;
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146 end
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147 end, 100);
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148
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149 -- Offer dialback to incoming hosts
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150 module:hook("s2s-stream-features", function (data)
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diff changeset
151 data.features:tag("dialback", { xmlns='urn:xmpp:features:dialback' }):up();
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152 end);