plugins/mod_saslauth.lua

   1
   2 local st = require "util.stanza";
   3 local send = require "core.sessionmanager".send_to_session;
   4 local sm_bind_resource = require "core.sessionmanager".bind_resource;
   5
   6 local usermanager_validate_credentials = require "core.usermanager".validate_credentials;
   7 local t_concat, t_insert = table.concat, table.insert;
   8 local tostring = tostring;
   9
  10 local log = require "util.logger".init("mod_saslauth");
  11
  12 local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl';
  13 local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind';
  14 local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas';
  15
  16 local new_connhandler = require "net.connhandlers".new;
  17 local new_sasl = require "util.sasl".new;
  18
  19 add_handler("c2s_unauthed", "auth", xmlns_sasl,
  20                 function (session, stanza)
  21                         if not session.sasl_handler then
  22                                 session.sasl_handler = new_sasl(stanza.attr.mechanism,
  23                                         function (username, password)
  24                                                 -- onAuth
  25                                                 require "core.usermanager"
  26                                                 if usermanager_validate_credentials(session.host, username, password) then
  27                                                         return true;
  28                                                 end
  29                                                 return false;
  30                                         end,
  31                                         function (username)
  32                                                 -- onSuccess
  33                                                 local success, err = sessionmanager.make_authenticated(session, username);
  34                                                 if not success then
  35                                                         sessionmanager.destroy_session(session);
  36                                                         return;
  37                                                 end
  38                                                 session.sasl_handler = nil;
  39                                                 session:reset_stream();
  40                                         end,
  41                                         function (reason)
  42                                                 -- onFail
  43                                                 log("debug", "SASL failure, reason: %s", reason);
  44                                         end,
  45                                         function (stanza)
  46                                                 -- onWrite
  47                                                 log("debug", "SASL writes: %s", tostring(stanza));
  48                                                 send(session, stanza);
  49                                         end
  50                                 );
  51                                 session.sasl_handler:feed(stanza);
  52                         else
  53                                 error("Client tried to negotiate SASL again", 0);
  54                         end
  55
  56                 end);
  57
  58 add_event_hook("stream-features",
  59                                         function (session, features)
  60                                                 if not session.username then
  61                                                         t_insert(features, "<mechanisms xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>");
  62                                                                 t_insert(features, "<mechanism>PLAIN</mechanism>");
  63                                                         t_insert(features, "</mechanisms>");
  64                                                 else
  65                                                         t_insert(features, "<bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'><required/></bind>");
  66                                                         t_insert(features, "<session xmlns='urn:ietf:params:xml:ns:xmpp-session'/>");
  67                                                 end
  68                                                 --send [[<register xmlns="http://jabber.org/features/iq-register"/> ]]
  69                                         end);
  70
  71 add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind",
  72                 function (session, stanza)
  73                         log("debug", "Client tried to bind to a resource");
  74                         local resource;
  75                         if stanza.attr.type == "set" then
  76                                 local bind = stanza.tags[1];
  77
  78                                 if bind and bind.attr.xmlns == xmlns_bind then
  79                                         resource = bind:child_with_name("resource");
  80                                         if resource then
  81                                                 resource = resource[1];
  82                                         end
  83                                 end
  84                         end
  85                         local success, err = sm_bind_resource(session, resource);
  86                         if not success then
  87                                 local reply = st.reply(stanza);
  88                                 reply.attr.type = "error";
  89                                 if err == "conflict" then
  90                                         reply:tag("error", { type = "modify" })
  91                                                 :tag("conflict", { xmlns = xmlns_stanzas });
  92                                 elseif err == "constraint" then
  93                                         reply:tag("error", { type = "cancel" })
  94                                                 :tag("resource-constraint", { xmlns = xmlns_stanzas });
  95                                 elseif err == "auth" then
  96                                         reply:tag("error", { type = "cancel" })
  97                                                 :tag("not-allowed", { xmlns = xmlns_stanzas });
  98                                 end
  99                                 send(session, reply);
 100                         else
 101                                 local reply = st.reply(stanza);
 102                                 reply:tag("bind", { xmlns = xmlns_bind})
 103                                         :tag("jid"):text(session.full_jid);
 104                                 send(session, reply);
 105                         end
 106                 end);
 107
 108 add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session",
 109                 function (session, stanza)
 110                         log("debug", "Client tried to bind to a resource");
 111                         send(session, st.reply(stanza));
 112                 end);