prosody
751510cd558d
plugins/mod_dialback.lua

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plugins/mod_dialback.lua @ 4835:751510cd558d

mod_dialback: COMPAT reset session.send function for servers (e.g. ejabberd) which don't include a from attr when opening the stream.
author Marco Cirillo <maranda@lightwitch.org>
date Wed, 09 May 2012 02:56:22 +0000
parent 4761:178f252c31b0
child 4836:bda0593d3f73
child 4840:82679fad3a36
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 format = string.format;
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10
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11 local hosts = _G.hosts;
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12 local s2s_make_authenticated = require "core.s2smanager".make_authenticated;
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13
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14 local log = module._log;
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15
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16 local st = require "util.stanza";
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17 local sha256_hash = require "util.hashes".sha256;
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18
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19 local xmlns_stream = "http://etherx.jabber.org/streams";
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20
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21 local dialback_requests = setmetatable({}, { __mode = 'v' });
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22
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23 function generate_dialback(id, to, from)
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24 return sha256_hash(id..to..from..hosts[from].dialback_secret, true);
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25 end
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26
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27 function initiate_dialback(session)
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28 -- generate dialback key
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29 session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host);
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30 session.sends2s(format("<db:result from='%s' to='%s'>%s</db:result>", session.from_host, session.to_host, session.dialback_key));
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31 session.log("info", "sent dialback key on outgoing s2s stream");
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32 end
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33
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34 function verify_dialback(id, to, from, key)
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35 return key == generate_dialback(id, to, from);
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36 end
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37
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38 module:hook("stanza/jabber:server:dialback:verify", function(event)
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39 local origin, stanza = event.origin, event.stanza;
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40
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41 if origin.type == "s2sin_unauthed" or origin.type == "s2sin" then
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42 -- We are being asked to verify the key, to ensure it was generated by us
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43 origin.log("debug", "verifying that dialback key is ours...");
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44 local attr = stanza.attr;
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45 -- COMPAT: Grr, ejabberd breaks this one too?? it is black and white in XEP-220 example 34
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46 --if attr.from ~= origin.to_host then error("invalid-from"); end
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47 local type;
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48 if verify_dialback(attr.id, attr.from, attr.to, stanza[1]) then
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49 type = "valid"
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50 else
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51 type = "invalid"
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52 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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53 end
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54 origin.log("debug", "verified dialback key... it is %s", type);
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55 origin.sends2s(st.stanza("db:verify", { from = attr.to, to = attr.from, id = attr.id, type = type }):text(stanza[1]));
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56 return true;
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57 end
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58 end);
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59
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60 module:hook("stanza/jabber:server:dialback:result", function(event)
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61 local origin, stanza = event.origin, event.stanza;
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62
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63 if origin.type == "s2sin_unauthed" or origin.type == "s2sin" then
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64 -- he wants to be identified through dialback
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65 -- We need to check the key with the Authoritative server
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66 local attr = stanza.attr;
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67 origin.hosts[attr.from] = { dialback_key = stanza[1] };
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68
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69 if not hosts[attr.to] then
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70 -- Not a host that we serve
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71 origin.log("info", "%s tried to connect to %s, which we don't serve", attr.from, attr.to);
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72 origin:close("host-unknown");
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73 return true;
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74 end
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75
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76 dialback_requests[attr.from.."/"..origin.streamid] = origin;
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77
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78 if not origin.from_host then
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79 -- Just used for friendlier logging
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80 origin.from_host = attr.from;
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81 -- COMPAT: Fix ejabberd chopness by resetting the send function
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82 origin.log("debug", "Remote server didn't specify a from attr, resetting session.send now that we know where to knock to.");
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83 origin.send = function(stanza) hosts[attr.to].events.fire_event("route/remote", { from_host = origin.to_host, to_host = origin.from_host, stanza = stanza}); end
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84 end
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85 if not origin.to_host then
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86 -- Just used for friendlier logging
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87 origin.to_host = attr.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", attr.from, stanza[1]);
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91 origin.send(st.stanza("db:verify", { from = attr.to, to = attr.from, id = origin.streamid }):text(stanza[1]));
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92 return true;
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93 end
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94 end);
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95
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96 module:hook("stanza/jabber:server:dialback:verify", function(event)
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97 local origin, stanza = event.origin, event.stanza;
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98
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99 if origin.type == "s2sout_unauthed" or origin.type == "s2sout" then
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100 local attr = stanza.attr;
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101 local dialback_verifying = dialback_requests[attr.from.."/"..(attr.id or "")];
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102 module:log("debug", tostring(dialback_verifying).." "..attr.from.." "..origin.to_host);
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103 if dialback_verifying and attr.from == origin.to_host then
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104 local valid;
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105 if attr.type == "valid" then
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106 s2s_make_authenticated(dialback_verifying, attr.from);
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107 valid = "valid";
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108 else
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109 -- Warn the original connection that is was not verified successfully
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110 log("warn", "authoritative server for "..(attr.from or "(unknown)").." denied the key");
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111 valid = "invalid";
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112 end
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113 if not dialback_verifying.sends2s then
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114 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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115 else
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116 dialback_verifying.sends2s(
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117 st.stanza("db:result", { from = attr.to, to = attr.from, id = attr.id, type = valid })
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118 :text(dialback_verifying.hosts[attr.from].dialback_key));
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119 end
4314
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120 dialback_requests[attr.from.."/"..(attr.id or "")] = nil;
219
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121 end
3533
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122 return true;
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123 end
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124 end);
191
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parents:
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125
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126 module:hook("stanza/jabber:server:dialback:result", function(event)
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127 local origin, stanza = event.origin, event.stanza;
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128
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129 if origin.type == "s2sout_unauthed" or origin.type == "s2sout" then
621
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parents: 615
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130 -- Remote server is telling us whether we passed dialback
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131
cd2cab5400fc Add support for dialback piggy-backing. Fixes #37. Thanks to CShadowRun for helping me test :)
Matthew Wild <mwild1@gmail.com>
parents: 615
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132 local attr = stanza.attr;
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parents: 615
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133 if not hosts[attr.to] then
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parents: 615
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134 origin:close("host-unknown");
3533
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135 return true;
621
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parents: 615
diff changeset
136 elseif hosts[attr.to].s2sout[attr.from] ~= origin then
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Matthew Wild <mwild1@gmail.com>
parents: 615
diff changeset
137 -- This isn't right
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parents: 615
diff changeset
138 origin:close("invalid-id");
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parents: 2923
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139 return true;
621
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parents: 615
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140 end
219
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Waqas Hussain <waqas20@gmail.com>
parents: 191
diff changeset
141 if stanza.attr.type == "valid" then
621
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Matthew Wild <mwild1@gmail.com>
parents: 615
diff changeset
142 s2s_make_authenticated(origin, attr.from);
219
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parents: 191
diff changeset
143 else
4227
6b83ef6ec845 mod_dialback: Use session:close() on dialback failure instead of s2smanager.destroy_session() (thanks Zash)
Matthew Wild <mwild1@gmail.com>
parents: 3534
diff changeset
144 origin:close("not-authorized", "dialback authentication failed");
219
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Waqas Hussain <waqas20@gmail.com>
parents: 191
diff changeset
145 end
3533
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parents: 2923
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146 return true;
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parents: 2923
diff changeset
147 end
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Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
148 end);
1876
6d33e0521667 mod_dialback: Initiate dialback on incoming stream:features
Matthew Wild <mwild1@gmail.com>
parents: 1523
diff changeset
149
3651
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Paul Aurich <paul@darkrain42.org>
parents: 3534
diff changeset
150 module:hook_stanza("urn:ietf:params:xml:ns:xmpp-sasl", "failure", function (origin, stanza)
337391d34b70 s2s: SASL EXTERNAL
Paul Aurich <paul@darkrain42.org>
parents: 3534
diff changeset
151 if origin.external_auth == "failed" then
337391d34b70 s2s: SASL EXTERNAL
Paul Aurich <paul@darkrain42.org>
parents: 3534
diff changeset
152 module:log("debug", "SASL EXTERNAL failed, falling back to dialback");
4567
24617f360200 mod_dialback: import util.hashes and functionality once in s2smanager.
Florian Zeitz <florob@babelmonkeys.de>
parents: 4316
diff changeset
153 initiate_dialback(origin);
3651
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parents: 3534
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154 return true;
337391d34b70 s2s: SASL EXTERNAL
Paul Aurich <paul@darkrain42.org>
parents: 3534
diff changeset
155 end
337391d34b70 s2s: SASL EXTERNAL
Paul Aurich <paul@darkrain42.org>
parents: 3534
diff changeset
156 end, 100);
337391d34b70 s2s: SASL EXTERNAL
Paul Aurich <paul@darkrain42.org>
parents: 3534
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157
1876
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parents: 1523
diff changeset
158 module:hook_stanza(xmlns_stream, "features", function (origin, stanza)
3651
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Paul Aurich <paul@darkrain42.org>
parents: 3534
diff changeset
159 if not origin.external_auth or origin.external_auth == "failed" then
4587
93a84314c296 mod_dialback, mod_s2s: Log initiation of dialback in mod_dialback
Kim Alvefur <zash@zash.se>
parents: 4586
diff changeset
160 module:log("debug", "Initiating dialback...");
4567
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Florian Zeitz <florob@babelmonkeys.de>
parents: 4316
diff changeset
161 initiate_dialback(origin);
3651
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Paul Aurich <paul@darkrain42.org>
parents: 3534
diff changeset
162 return true;
337391d34b70 s2s: SASL EXTERNAL
Paul Aurich <paul@darkrain42.org>
parents: 3534
diff changeset
163 end
3534
c68590b13a6d mod_dialback: Fixed indentation.
Waqas Hussain <waqas20@gmail.com>
parents: 3533
diff changeset
164 end, 100);
1937
9c700500f408 mod_dialback: Catch s2s-stream-features and add dialback feature
Matthew Wild <mwild1@gmail.com>
parents: 1876
diff changeset
165
4586
4d63852910ff mod_s2s, mod_dialback: Rename event to s2s-authenticate-legacy
Kim Alvefur <zash@zash.se>
parents: 4584
diff changeset
166 module:hook("s2s-authenticate-legacy", function (event)
4587
93a84314c296 mod_dialback, mod_s2s: Log initiation of dialback in mod_dialback
Kim Alvefur <zash@zash.se>
parents: 4586
diff changeset
167 module:log("debug", "Initiating dialback...");
4584
9a5de6509aa8 mod_s2s, mod_dialback: Event on pre-XMPP streams, so we can try dialback.
Kim Alvefur <zash@zash.se>
parents: 4579
diff changeset
168 initiate_dialback(event.origin);
9a5de6509aa8 mod_s2s, mod_dialback: Event on pre-XMPP streams, so we can try dialback.
Kim Alvefur <zash@zash.se>
parents: 4579
diff changeset
169 return true;
9a5de6509aa8 mod_s2s, mod_dialback: Event on pre-XMPP streams, so we can try dialback.
Kim Alvefur <zash@zash.se>
parents: 4579
diff changeset
170 end, 100);
9a5de6509aa8 mod_s2s, mod_dialback: Event on pre-XMPP streams, so we can try dialback.
Kim Alvefur <zash@zash.se>
parents: 4579
diff changeset
171
1937
9c700500f408 mod_dialback: Catch s2s-stream-features and add dialback feature
Matthew Wild <mwild1@gmail.com>
parents: 1876
diff changeset
172 -- Offer dialback to incoming hosts
9c700500f408 mod_dialback: Catch s2s-stream-features and add dialback feature
Matthew Wild <mwild1@gmail.com>
parents: 1876
diff changeset
173 module:hook("s2s-stream-features", function (data)
4264
fa36e749749c mod_dialback: Remove <optional/> from stream feature, as per latest specs.
Waqas Hussain <waqas20@gmail.com>
parents: 4238
diff changeset
174 data.features:tag("dialback", { xmlns='urn:xmpp:features:dialback' }):up();
3534
c68590b13a6d mod_dialback: Fixed indentation.
Waqas Hussain <waqas20@gmail.com>
parents: 3533
diff changeset
175 end);