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plugins/mod_dialback.lua @ 9421:03b50f5bd8cd
configure: Replace logic constructs with explicit if/else statements
author | Matthew Wild <mwild1@gmail.com> |
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date | Mon, 01 Oct 2018 15:32:47 +0100 |
parent | 8518:0de0018bdf91 |
child | 10376:b337df192a10 |
child | 11556:6f56170ea986 |
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 -- |
758 | 5 -- This project is MIT/X11 licensed. Please see the |
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; |
191 | 10 |
1070
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mod_dialback: Use module logger instead of creating a new one
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11 local log = module._log; |
559
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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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mod_dialback: Follow XEP-0185 and use HMAC
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15 local sha256_hmac = require "util.hashes".hmac_sha256; |
4836
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mod_dialback: add better safe then sorry nameprepping to the from attribute.
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16 local nameprep = require "util.encodings".stringprep.nameprep; |
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17 local uuid_gen = require"util.uuid".generate; |
191 | 18 |
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mod_dialback: Initiate dialback on incoming stream:features
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19 local xmlns_stream = "http://etherx.jabber.org/streams"; |
191 | 20 |
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21 local dialback_requests = setmetatable({}, { __mode = 'v' }); |
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22 |
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23 local dialback_secret = sha256_hash(module:get_option_string("dialback_secret", uuid_gen()), true); |
6301
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mod_dialback: Short-circuit dialback auth if certificate is considered valid
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24 local dwd = module:get_option_boolean("dialback_without_dialback", false); |
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25 |
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26 --- Helper to check that a session peer's certificate is valid |
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27 function check_cert_status(session) |
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28 local host = session.direction == "outgoing" and session.to_host or session.from_host |
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29 local conn = session.conn:socket() |
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30 local cert |
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31 if conn.getpeercertificate then |
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32 cert = conn:getpeercertificate() |
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33 end |
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34 |
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35 return module:fire_event("s2s-check-certificate", { host = host, session = session, cert = cert }); |
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36 end |
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37 |
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38 |
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39 function module.save() |
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40 return { dialback_secret = dialback_secret }; |
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41 end |
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42 |
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43 function module.restore(state) |
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44 dialback_secret = state.dialback_secret; |
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45 end |
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46 |
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47 function generate_dialback(id, to, from) |
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48 return sha256_hmac(dialback_secret, to .. ' ' .. from .. ' ' .. id, true); |
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49 end |
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50 |
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51 function initiate_dialback(session) |
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52 -- generate dialback key |
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53 session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host); |
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54 session.sends2s(st.stanza("db:result", { from = session.from_host, to = session.to_host }):text(session.dialback_key)); |
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55 session.log("debug", "sent dialback key on outgoing s2s stream"); |
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56 end |
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57 |
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58 function verify_dialback(id, to, from, key) |
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59 return key == generate_dialback(id, to, from); |
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60 end |
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61 |
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62 module:hook("stanza/jabber:server:dialback:verify", function(event) |
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63 local origin, stanza = event.origin, event.stanza; |
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64 |
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65 if origin.type == "s2sin_unauthed" or origin.type == "s2sin" then |
219 | 66 -- We are being asked to verify the key, to ensure it was generated by us |
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67 origin.log("debug", "verifying that dialback key is ours..."); |
219 | 68 local attr = stanza.attr; |
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mod_dialback: Ignore <db:verify/> with a 'type' attribute on incoming connections, instead of interpreting them as a request to verify a key
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69 if attr.type then |
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70 module:log("warn", "Ignoring incoming session from %s claiming a dialback key for %s is %s", |
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71 origin.from_host or "(unknown)", attr.from or "(unknown)", attr.type); |
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72 return true; |
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73 end |
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74 -- COMPAT: Grr, ejabberd breaks this one too?? it is black and white in XEP-220 example 34 |
219 | 75 --if attr.from ~= origin.to_host then error("invalid-from"); end |
76 local type; | |
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77 if verify_dialback(attr.id, attr.from, attr.to, stanza[1]) then |
219 | 78 type = "valid" |
79 else | |
80 type = "invalid" | |
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81 origin.log("warn", "Asked to verify a dialback key that was incorrect. An imposter is claiming to be %s?", attr.to); |
219 | 82 end |
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83 origin.log("debug", "verified dialback key... it is %s", type); |
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84 origin.sends2s(st.stanza("db:verify", { from = attr.to, to = attr.from, id = attr.id, type = type }):text(stanza[1])); |
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85 return true; |
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86 end |
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87 end); |
191 | 88 |
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89 module:hook("stanza/jabber:server:dialback:result", function(event) |
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90 local origin, stanza = event.origin, event.stanza; |
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91 |
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92 if origin.type == "s2sin_unauthed" or origin.type == "s2sin" then |
219 | 93 -- he wants to be identified through dialback |
94 -- We need to check the key with the Authoritative server | |
95 local attr = stanza.attr; | |
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96 local to, from = nameprep(attr.to), nameprep(attr.from); |
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97 |
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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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98 if not hosts[to] then |
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99 -- Not a host that we serve |
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100 origin.log("warn", "%s tried to connect to %s, which we don't serve", from, to); |
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101 origin:close("host-unknown"); |
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102 return true; |
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103 elseif not from then |
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104 origin:close("improper-addressing"); |
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105 end |
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106 |
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107 if dwd and origin.secure then |
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108 if check_cert_status(origin, from) == false then |
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109 return |
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110 elseif origin.cert_chain_status == "valid" and origin.cert_identity_status == "valid" then |
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111 origin.sends2s(st.stanza("db:result", { to = from, from = to, id = attr.id, type = "valid" })); |
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112 module:fire_event("s2s-authenticated", { session = origin, host = from }); |
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113 return true; |
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114 end |
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115 end |
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116 |
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117 origin.hosts[from] = { dialback_key = stanza[1] }; |
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118 |
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119 dialback_requests[from.."/"..origin.streamid] = origin; |
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120 |
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121 -- COMPAT: ejabberd, gmail and perhaps others do not always set 'to' and 'from' |
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122 -- on streams. We fill in the session's to/from here instead. |
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123 if not origin.from_host then |
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124 origin.from_host = from; |
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125 end |
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126 if not origin.to_host then |
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127 origin.to_host = to; |
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128 end |
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129 |
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130 origin.log("debug", "asking %s if key %s belongs to them", from, stanza[1]); |
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131 module:fire_event("route/remote", { |
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132 from_host = to, to_host = from; |
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133 stanza = st.stanza("db:verify", { from = to, to = from, id = origin.streamid }):text(stanza[1]); |
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134 }); |
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135 return true; |
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136 end |
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137 end); |
191 | 138 |
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139 module:hook("stanza/jabber:server:dialback:verify", function(event) |
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140 local origin, stanza = event.origin, event.stanza; |
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141 |
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142 if origin.type == "s2sout_unauthed" or origin.type == "s2sout" then |
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143 local attr = stanza.attr; |
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144 local dialback_verifying = dialback_requests[attr.from.."/"..(attr.id or "")]; |
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145 if dialback_verifying and attr.from == origin.to_host then |
219 | 146 local valid; |
147 if attr.type == "valid" then | |
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148 module:fire_event("s2s-authenticated", { session = dialback_verifying, host = attr.from }); |
219 | 149 valid = "valid"; |
150 else | |
151 -- Warn the original connection that is was not verified successfully | |
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152 log("warn", "authoritative server for %s denied the key", attr.from or "(unknown)"); |
219 | 153 valid = "invalid"; |
191 | 154 end |
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155 if dialback_verifying.destroyed then |
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156 log("warn", "Incoming s2s session %s was closed in the meantime, so we can't notify it of the dialback result", |
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157 tostring(dialback_verifying):match("%w+$")); |
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158 else |
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159 dialback_verifying.sends2s( |
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160 st.stanza("db:result", { from = attr.to, to = attr.from, id = attr.id, type = valid }) |
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161 :text(dialback_verifying.hosts[attr.from].dialback_key)); |
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162 end |
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163 dialback_requests[attr.from.."/"..(attr.id or "")] = nil; |
219 | 164 end |
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165 return true; |
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166 end |
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167 end); |
191 | 168 |
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169 module:hook("stanza/jabber:server:dialback:result", function(event) |
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170 local origin, stanza = event.origin, event.stanza; |
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171 |
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172 if origin.type == "s2sout_unauthed" or origin.type == "s2sout" then |
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173 -- Remote server is telling us whether we passed dialback |
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174 |
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175 local attr = stanza.attr; |
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176 if not hosts[attr.to] then |
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177 origin:close("host-unknown"); |
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178 return true; |
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179 elseif hosts[attr.to].s2sout[attr.from] ~= origin then |
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180 -- This isn't right |
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181 origin:close("invalid-id"); |
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182 return true; |
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183 end |
219 | 184 if stanza.attr.type == "valid" then |
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185 module:fire_event("s2s-authenticated", { session = origin, host = attr.from }); |
219 | 186 else |
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187 origin:close("not-authorized", "dialback authentication failed"); |
219 | 188 end |
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189 return true; |
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190 end |
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191 end); |
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192 |
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193 module:hook_tag("urn:ietf:params:xml:ns:xmpp-sasl", "failure", function (origin, stanza) -- luacheck: ignore 212/stanza |
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194 if origin.external_auth == "failed" then |
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195 module:log("debug", "SASL EXTERNAL failed, falling back to dialback"); |
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196 initiate_dialback(origin); |
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197 return true; |
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198 end |
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199 end, 100); |
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200 |
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201 module:hook_tag(xmlns_stream, "features", function (origin, stanza) -- luacheck: ignore 212/stanza |
3651 | 202 if not origin.external_auth or origin.external_auth == "failed" then |
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203 module:log("debug", "Initiating dialback..."); |
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204 initiate_dialback(origin); |
3651 | 205 return true; |
206 end | |
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207 end, 100); |
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208 |
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209 module:hook("s2sout-authenticate-legacy", function (event) |
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210 module:log("debug", "Initiating dialback..."); |
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211 initiate_dialback(event.origin); |
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212 return true; |
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213 end, 100); |
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214 |
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215 -- Offer dialback to incoming hosts |
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216 module:hook("s2s-stream-features", function (data) |
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217 data.features:tag("dialback", { xmlns='urn:xmpp:features:dialback' }):up(); |
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218 end); |