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         or 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", "Legacy authentication is only allowed for unauthenticated client connections."));
  39                 return true;
  40         end
  41
  42         if secure_auth_only and not session.secure then
  43                 session.send(st.error_reply(stanza, "modify", "not-acceptable", "Encryption (SSL or TLS) is required to connect to this server"));
  44                 return true;
  45         end
  46
  47         local username = stanza.tags[1]:child_with_name("username");
  48         local password = stanza.tags[1]:child_with_name("password");
  49         local resource = stanza.tags[1]:child_with_name("resource");
  50         if not (username and password and resource) then
  51                 local reply = st.reply(stanza);
  52                 session.send(reply:query("jabber:iq:auth")
  53                         :tag("username"):up()
  54                         :tag("password"):up()
  55                         :tag("resource"):up());
  56         else
  57                 username, password, resource = t_concat(username), t_concat(password), t_concat(resource);
  58                 username = nodeprep(username);
  59                 resource = resourceprep(resource)
  60                 if not (username and resource) then
  61                         session.send(st.error_reply(stanza, "modify", "bad-request"));
  62                         return true;
  63                 end
  64                 if usermanager.test_password(username, session.host, password) then
  65                         -- Authentication successful!
  66                         local success, err = sessionmanager.make_authenticated(session, username);
  67                         if success then
  68                                 local err_type, err_msg;
  69                                 success, err_type, err, err_msg = sessionmanager.bind_resource(session, resource);
  70                                 if not success then
  71                                         session.send(st.error_reply(stanza, err_type, err, err_msg));
  72                                         session.username, session.type = nil, "c2s_unauthed"; -- FIXME should this be placed in sessionmanager?
  73                                         return true;
  74                                 elseif resource ~= session.resource then -- server changed resource, not supported by legacy auth
  75                                         session.send(st.error_reply(stanza, "cancel", "conflict", "The requested resource could not be assigned to this session."));
  76                                         session:close(); -- FIXME undo resource bind and auth instead of closing the session?
  77                                         return true;
  78                                 end
  79                         end
  80                         session.send(st.reply(stanza));
  81                 else
  82                         session.send(st.error_reply(stanza, "auth", "not-authorized"));
  83                 end
  84         end
  85         return true;
  86 end);