prosody
5c6e78dc1864
plugins/mod_dialback.lua

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plugins/mod_dialback.lua @ 7103:5c6e78dc1864

mod_dialback: Follow XEP-0185 and use HMAC
author Kim Alvefur <zash@zash.se>
date Tue, 19 Jan 2016 21:31:02 +0100
parent 5362:612467e263af
child 7106:74798480b52e
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
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11 local log = module._log;
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12
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13 local st = require "util.stanza";
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14 local sha256_hash = require "util.hashes".sha256;
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15 local sha256_hmac = require "util.hashes".hmac_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_hmac(sha256_hash(hosts[from].dialback_secret), to .. ' ' .. from .. ' ' .. id, 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 if attr.type then
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45 module:log("warn", "Ignoring incoming session from %s claiming a dialback key for %s is %s",
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46 origin.from_host or "(unknown)", attr.from or "(unknown)", attr.type);
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47 return true;
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48 end
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49 -- COMPAT: Grr, ejabberd breaks this one too?? it is black and white in XEP-220 example 34
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50 --if attr.from ~= origin.to_host then error("invalid-from"); end
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51 local type;
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52 if verify_dialback(attr.id, attr.from, attr.to, stanza[1]) then
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53 type = "valid"
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54 else
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55 type = "invalid"
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56 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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57 end
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58 origin.log("debug", "verified dialback key... it is %s", type);
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59 origin.sends2s(st.stanza("db:verify", { from = attr.to, to = attr.from, id = attr.id, type = type }):text(stanza[1]));
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60 return true;
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61 end
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62 end);
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63
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64 module:hook("stanza/jabber:server:dialback:result", function(event)
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65 local origin, stanza = event.origin, event.stanza;
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66
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67 if origin.type == "s2sin_unauthed" or origin.type == "s2sin" then
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68 -- he wants to be identified through dialback
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69 -- We need to check the key with the Authoritative server
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70 local attr = stanza.attr;
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71 local to, from = nameprep(attr.to), nameprep(attr.from);
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72
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73 if not hosts[to] then
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74 -- Not a host that we serve
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75 origin.log("info", "%s tried to connect to %s, which we don't serve", from, to);
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76 origin:close("host-unknown");
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77 return true;
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78 elseif not from then
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79 origin:close("improper-addressing");
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80 end
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81
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82 origin.hosts[from] = { dialback_key = stanza[1] };
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83
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84 dialback_requests[from.."/"..origin.streamid] = origin;
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85
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86 -- COMPAT: ejabberd, gmail and perhaps others do not always set 'to' and 'from'
5ef05f32bc42 mod_s2s, s2smanager, mod_dialback: Move addition of session.send() on s2sin to after they are authenticated (thus from mod_s2s to s2smanager). Update mod_dialback to fire route/remote directly, as session.send() is no longer available for s2sin_unauthed. Fixes #291.
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87 -- on streams. We fill in the session's to/from here instead.
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88 if not origin.from_host then
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89 origin.from_host = from;
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90 end
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91 if not origin.to_host then
4931
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92 origin.to_host = to;
4837
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93 end
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94
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95 origin.log("debug", "asking %s if key %s belongs to them", from, stanza[1]);
5ef05f32bc42 mod_s2s, s2smanager, mod_dialback: Move addition of session.send() on s2sin to after they are authenticated (thus from mod_s2s to s2smanager). Update mod_dialback to fire route/remote directly, as session.send() is no longer available for s2sin_unauthed. Fixes #291.
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96 module:fire_event("route/remote", {
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97 from_host = to, to_host = from;
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98 stanza = st.stanza("db:verify", { from = to, to = from, id = origin.streamid }):text(stanza[1]);
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99 });
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100 return true;
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101 end
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102 end);
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103
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104 module:hook("stanza/jabber:server:dialback:verify", function(event)
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105 local origin, stanza = event.origin, event.stanza;
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106
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107 if origin.type == "s2sout_unauthed" or origin.type == "s2sout" then
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108 local attr = stanza.attr;
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109 local dialback_verifying = dialback_requests[attr.from.."/"..(attr.id or "")];
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110 if dialback_verifying and attr.from == origin.to_host then
219
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111 local valid;
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parents: 191
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112 if attr.type == "valid" then
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113 module:fire_event("s2s-authenticated", { session = dialback_verifying, host = attr.from });
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114 valid = "valid";
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115 else
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116 -- Warn the original connection that is was not verified successfully
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parents: 4931
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117 log("warn", "authoritative server for %s denied the key", attr.from or "(unknown)");
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118 valid = "invalid";
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119 end
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parents: 5019
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120 if dialback_verifying.destroyed then
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121 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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122 else
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123 dialback_verifying.sends2s(
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124 st.stanza("db:result", { from = attr.to, to = attr.from, id = attr.id, type = valid })
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125 :text(dialback_verifying.hosts[attr.from].dialback_key));
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126 end
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127 dialback_requests[attr.from.."/"..(attr.id or "")] = nil;
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128 end
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129 return true;
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130 end
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131 end);
191
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parents:
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132
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133 module:hook("stanza/jabber:server:dialback:result", function(event)
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134 local origin, stanza = event.origin, event.stanza;
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135
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136 if origin.type == "s2sout_unauthed" or origin.type == "s2sout" then
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parents: 615
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137 -- Remote server is telling us whether we passed dialback
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138
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139 local attr = stanza.attr;
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140 if not hosts[attr.to] then
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141 origin:close("host-unknown");
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142 return true;
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parents: 615
diff changeset
143 elseif hosts[attr.to].s2sout[attr.from] ~= origin then
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144 -- This isn't right
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145 origin:close("invalid-id");
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146 return true;
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diff changeset
147 end
219
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diff changeset
148 if stanza.attr.type == "valid" then
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parents: 5341
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149 module:fire_event("s2s-authenticated", { session = origin, host = attr.from });
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150 else
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parents: 3534
diff changeset
151 origin:close("not-authorized", "dialback authentication failed");
219
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diff changeset
152 end
3533
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153 return true;
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parents: 2923
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154 end
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parents: 2923
diff changeset
155 end);
1876
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parents: 1523
diff changeset
156
3651
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parents: 3534
diff changeset
157 module:hook_stanza("urn:ietf:params:xml:ns:xmpp-sasl", "failure", function (origin, stanza)
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diff changeset
158 if origin.external_auth == "failed" then
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diff changeset
159 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
160 initiate_dialback(origin);
3651
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161 return true;
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parents: 3534
diff changeset
162 end
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163 end, 100);
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parents: 3534
diff changeset
164
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parents: 1523
diff changeset
165 module:hook_stanza(xmlns_stream, "features", function (origin, stanza)
3651
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parents: 3534
diff changeset
166 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
167 module:log("debug", "Initiating dialback...");
4567
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parents: 4316
diff changeset
168 initiate_dialback(origin);
3651
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169 return true;
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parents: 3534
diff changeset
170 end
3534
c68590b13a6d mod_dialback: Fixed indentation.
Waqas Hussain <waqas20@gmail.com>
parents: 3533
diff changeset
171 end, 100);
1937
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parents: 1876
diff changeset
172
5341
760c22c822be mod_s2s, mod_dialback: Rename s2s-authenticate-legacy event to s2sout-authenticate-legacy for clarity. Also, hello!
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parents: 5113
diff changeset
173 module:hook("s2sout-authenticate-legacy", function (event)
4587
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Kim Alvefur <zash@zash.se>
parents: 4586
diff changeset
174 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
175 initiate_dialback(event.origin);
9a5de6509aa8 mod_s2s, mod_dialback: Event on pre-XMPP streams, so we can try dialback.
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parents: 4579
diff changeset
176 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
177 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
178
1937
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parents: 1876
diff changeset
179 -- Offer dialback to incoming hosts
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parents: 1876
diff changeset
180 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
181 data.features:tag("dialback", { xmlns='urn:xmpp:features:dialback' }):up();
3534
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parents: 3533
diff changeset
182 end);