plugins/mod_legacyauth.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2010 Matthew Wild
   3 -- Copyright (C) 2008-2010 Waqas Hussain
   4 --
   5 -- This project is MIT/X11 licensed. Please see the
   6 -- COPYING file in the source package for more information.
   7 --
   8
   9
  10
  11 local st = require "util.stanza";
  12 local t_concat = table.concat;
  13
  14 local secure_auth_only = module:get_option("c2s_require_encryption",
  15         module:get_option("require_encryption"))
  16         or not(module:get_option("allow_unencrypted_plain_auth"));
  17
  18 local sessionmanager = require "core.sessionmanager";
  19 local usermanager = require "core.usermanager";
  20 local nodeprep = require "util.encodings".stringprep.nodeprep;
  21 local resourceprep = require "util.encodings".stringprep.resourceprep;
  22
  23 module:add_feature("jabber:iq:auth");
  24 module:hook("stream-features", function(event)
  25         local origin, features = event.origin, event.features;
  26         if secure_auth_only and not origin.secure then
  27                 -- Sorry, not offering to insecure streams!
  28                 return;
  29         elseif not origin.username then
  30                 features:tag("auth", {xmlns='http://jabber.org/features/iq-auth'}):up();
  31         end
  32 end);
  33
  34 module:hook("stanza/iq/jabber:iq:auth:query", function(event)
  35         local session, stanza = event.origin, event.stanza;
  36
  37         if session.type ~= "c2s_unauthed" then
  38                 (session.sends2s or session.send)(st.error_reply(stanza, "cancel", "service-unavailable",
  39                         "Legacy authentication is only allowed for unauthenticated client connections."));
  40                 return true;
  41         end
  42
  43         if secure_auth_only and not session.secure then
  44                 session.send(st.error_reply(stanza, "modify", "not-acceptable", "Encryption (SSL or TLS) is required to connect to this server"));
  45                 return true;
  46         end
  47
  48         local query = stanza.tags[1];
  49         local username = query:get_child("username");
  50         local password = query:get_child("password");
  51         local resource = query:get_child("resource");
  52         if not (username and password and resource) then
  53                 local reply = st.reply(stanza);
  54                 session.send(reply:query("jabber:iq:auth")
  55                         :tag("username"):up()
  56                         :tag("password"):up()
  57                         :tag("resource"):up());
  58         else
  59                 username, password, resource = t_concat(username), t_concat(password), t_concat(resource);
  60                 username = nodeprep(username);
  61                 resource = resourceprep(resource)
  62                 if not (username and resource) then
  63                         session.send(st.error_reply(stanza, "modify", "bad-request"));
  64                         return true;
  65                 end
  66                 if usermanager.test_password(username, session.host, password) then
  67                         -- Authentication successful!
  68                         local success, err = sessionmanager.make_authenticated(session, username);
  69                         if success then
  70                                 local err_type, err_msg;
  71                                 success, err_type, err, err_msg = sessionmanager.bind_resource(session, resource);
  72                                 if not success then
  73                                         session.send(st.error_reply(stanza, err_type, err, err_msg));
  74                                         session.username, session.type = nil, "c2s_unauthed"; -- FIXME should this be placed in sessionmanager?
  75                                         return true;
  76                                 elseif resource ~= session.resource then -- server changed resource, not supported by legacy auth
  77                                         session.send(st.error_reply(stanza, "cancel", "conflict", "The requested resource could not be assigned to this session."));
  78                                         session:close(); -- FIXME undo resource bind and auth instead of closing the session?
  79                                         return true;
  80                                 end
  81                         end
  82                         session.send(st.reply(stanza));
  83                 else
  84                         session.send(st.error_reply(stanza, "auth", "not-authorized"));
  85                 end
  86         end
  87         return true;
  88 end);