core/stanza_router.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 local log = require "util.logger".init("stanzarouter")
  10
  11 local hosts = _G.prosody.hosts;
  12 local tostring = tostring;
  13 local st = require "util.stanza";
  14 local jid_split = require "util.jid".split;
  15 local jid_prepped_split = require "util.jid".prepped_split;
  16
  17 local full_sessions = _G.prosody.full_sessions;
  18 local bare_sessions = _G.prosody.bare_sessions;
  19
  20 local core_post_stanza, core_process_stanza, core_route_stanza;
  21
  22 function deprecated_warning(f)
  23         _G[f] = function(...)
  24                 log("warn", "Using the global %s() is deprecated, use module:send() or prosody.%s(). %s", f, f, debug.traceback());
  25                 return prosody[f](...);
  26         end
  27 end
  28 deprecated_warning"core_post_stanza";
  29 deprecated_warning"core_process_stanza";
  30 deprecated_warning"core_route_stanza";
  31
  32 local function handle_unhandled_stanza(host, origin, stanza)
  33         local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns or "jabber:client", origin.type;
  34         if name == "iq" and xmlns == "jabber:client" then
  35                 if stanza.attr.type == "get" or stanza.attr.type == "set" then
  36                         xmlns = stanza.tags[1].attr.xmlns or "jabber:client";
  37                         log("debug", "Stanza of type %s from %s has xmlns: %s", name, origin_type, xmlns);
  38                 else
  39                         log("debug", "Discarding %s from %s of type: %s", name, origin_type, stanza.attr.type);
  40                         return true;
  41                 end
  42         end
  43         if stanza.attr.xmlns == nil and origin.send then
  44                 log("debug", "Unhandled %s stanza: %s; xmlns=%s", origin.type, stanza.name, xmlns); -- we didn't handle it
  45                 if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
  46                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
  47                 end
  48         elseif not((name == "features" or name == "error") and xmlns == "http://etherx.jabber.org/streams") then -- FIXME remove check once we handle S2S features
  49                 log("warn", "Unhandled %s stream element or stanza: %s; xmlns=%s: %s", origin.type, stanza.name, xmlns, tostring(stanza)); -- we didn't handle it
  50                 origin:close("unsupported-stanza-type");
  51         end
  52 end
  53
  54 local iq_types = { set=true, get=true, result=true, error=true };
  55 function core_process_stanza(origin, stanza)
  56         (origin.log or log)("debug", "Received[%s]: %s", origin.type, stanza:top_tag())
  57
  58         -- TODO verify validity of stanza (as well as JID validity)
  59         if stanza.attr.type == "error" and #stanza.tags == 0 then return; end -- TODO invalid stanza, log
  60         if stanza.name == "iq" then
  61                 if not stanza.attr.id then stanza.attr.id = ""; end -- COMPAT Jabiru doesn't send the id attribute on roster requests
  62                 if not iq_types[stanza.attr.type] or ((stanza.attr.type == "set" or stanza.attr.type == "get") and (#stanza.tags ~= 1)) then
  63                         origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid IQ type or incorrect number of children"));
  64                         return;
  65                 end
  66         end
  67
  68         if origin.type == "c2s" and not stanza.attr.xmlns then
  69                 if not origin.full_jid
  70                         and not(stanza.name == "iq" and stanza.attr.type == "set" and stanza.tags[1] and stanza.tags[1].name == "bind"
  71                                         and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then
  72                         -- authenticated client isn't bound and current stanza is not a bind request
  73                         if stanza.attr.type ~= "result" and stanza.attr.type ~= "error" then
  74                                 origin.send(st.error_reply(stanza, "auth", "not-authorized")); -- FIXME maybe allow stanzas to account or server
  75                         end
  76                         return;
  77                 end
  78
  79                 -- TODO also, stanzas should be returned to their original state before the function ends
  80                 stanza.attr.from = origin.full_jid;
  81         end
  82         local to, xmlns = stanza.attr.to, stanza.attr.xmlns;
  83         local from = stanza.attr.from;
  84         local node, host, resource;
  85         local from_node, from_host, from_resource;
  86         local to_bare, from_bare;
  87         if to then
  88                 if full_sessions[to] or bare_sessions[to] or hosts[to] then
  89                         node, host = jid_split(to); -- TODO only the host is needed, optimize
  90                 else
  91                         node, host, resource = jid_prepped_split(to);
  92                         if not host then
  93                                 log("warn", "Received stanza with invalid destination JID: %s", to);
  94                                 if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
  95                                         origin.send(st.error_reply(stanza, "modify", "jid-malformed", "The destination address is invalid: "..to));
  96                                 end
  97                                 return;
  98                         end
  99                         to_bare = node and (node.."@"..host) or host; -- bare JID
 100                         if resource then to = to_bare.."/"..resource; else to = to_bare; end
 101                         stanza.attr.to = to;
 102                 end
 103         end
 104         if from and not origin.full_jid then
 105                 -- We only stamp the 'from' on c2s stanzas, so we still need to check validity
 106                 from_node, from_host, from_resource = jid_prepped_split(from);
 107                 if not from_host then
 108                         log("warn", "Received stanza with invalid source JID: %s", from);
 109                         if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
 110                                 origin.send(st.error_reply(stanza, "modify", "jid-malformed", "The source address is invalid: "..from));
 111                         end
 112                         return;
 113                 end
 114                 from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
 115                 if from_resource then from = from_bare.."/"..from_resource; else from = from_bare; end
 116                 stanza.attr.from = from;
 117         end
 118
 119         if (origin.type == "s2sin" or origin.type == "c2s" or origin.type == "component") and xmlns == nil then
 120                 if origin.type == "s2sin" and not origin.dummy then
 121                         local host_status = origin.hosts[from_host];
 122                         if not host_status or not host_status.authed then -- remote server trying to impersonate some other server?
 123                                 log("warn", "Received a stanza claiming to be from %s, over a stream authed for %s!", from_host, origin.from_host);
 124                                 origin:close("not-authorized");
 125                                 return;
 126                         elseif not hosts[host] then
 127                                 log("warn", "Remote server %s sent us a stanza for %s, closing stream", origin.from_host, host);
 128                                 origin:close("host-unknown");
 129                                 return;
 130                         end
 131                 end
 132                 core_post_stanza(origin, stanza, origin.full_jid);
 133         else
 134                 local h = hosts[stanza.attr.to or origin.host or origin.to_host];
 135                 if h then
 136                         local event;
 137                         if xmlns == nil then
 138                                 if stanza.name == "iq" and (stanza.attr.type == "set" or stanza.attr.type == "get") then
 139                                         event = "stanza/iq/"..stanza.tags[1].attr.xmlns..":"..stanza.tags[1].name;
 140                                 else
 141                                         event = "stanza/"..stanza.name;
 142                                 end
 143                         else
 144                                 event = "stanza/"..xmlns..":"..stanza.name;
 145                         end
 146                         if h.events.fire_event(event, {origin = origin, stanza = stanza}) then return; end
 147                 end
 148                 if host and not hosts[host] then host = nil; end -- COMPAT: workaround for a Pidgin bug which sets 'to' to the SRV result
 149                 handle_unhandled_stanza(host or origin.host or origin.to_host, origin, stanza);
 150         end
 151 end
 152
 153 function core_post_stanza(origin, stanza, preevents)
 154         local to = stanza.attr.to;
 155         local node, host, resource = jid_split(to);
 156         local to_bare = node and (node.."@"..host) or host; -- bare JID
 157
 158         local to_type, to_self;
 159         if node then
 160                 if resource then
 161                         to_type = '/full';
 162                 else
 163                         to_type = '/bare';
 164                         if node == origin.username and host == origin.host then
 165                                 stanza.attr.to = nil;
 166                                 to_self = true;
 167                         end
 168                 end
 169         else
 170                 if host then
 171                         to_type = '/host';
 172                 else
 173                         to_type = '/bare';
 174                         to_self = true;
 175                 end
 176         end
 177
 178         local event_data = {origin=origin, stanza=stanza};
 179         if preevents then -- c2s connection
 180                 if hosts[origin.host].events.fire_event('pre-'..stanza.name..to_type, event_data) then return; end -- do preprocessing
 181         end
 182         local h = hosts[to_bare] or hosts[host or origin.host];
 183         if h then
 184                 if h.events.fire_event(stanza.name..to_type, event_data) then return; end -- do processing
 185                 if to_self and h.events.fire_event(stanza.name..'/self', event_data) then return; end -- do processing
 186                 handle_unhandled_stanza(h.host, origin, stanza);
 187         else
 188                 core_route_stanza(origin, stanza);
 189         end
 190 end
 191
 192 function core_route_stanza(origin, stanza)
 193         local node, host, resource = jid_split(stanza.attr.to);
 194         local from_node, from_host, from_resource = jid_split(stanza.attr.from);
 195
 196         -- Auto-detect origin if not specified
 197         origin = origin or hosts[from_host];
 198         if not origin then return false; end
 199
 200         if hosts[host] then
 201                 -- old stanza routing code removed
 202                 core_post_stanza(origin, stanza);
 203         else
 204                 log("debug", "Routing to remote...");
 205                 local host_session = hosts[from_host];
 206                 if not host_session then
 207                         log("error", "No hosts[from_host] (please report): %s", tostring(stanza));
 208                 else
 209                         local xmlns = stanza.attr.xmlns;
 210                         stanza.attr.xmlns = nil;
 211                         local routed = host_session.events.fire_event("route/remote", { origin = origin, stanza = stanza, from_host = from_host, to_host = host });
 212                         stanza.attr.xmlns = xmlns; -- reset
 213                         if not routed then
 214                                 log("debug", "... no, just kidding.");
 215                                 if stanza.attr.type == "error" or (stanza.name == "iq" and stanza.attr.type == "result") then return; end
 216                                 core_route_stanza(host_session, st.error_reply(stanza, "cancel", "not-allowed", "Communication with remote domains is not enabled"));
 217                         end
 218                 end
 219         end
 220 end
 221 prosody.core_process_stanza = core_process_stanza;
 222 prosody.core_post_stanza = core_post_stanza;
 223 prosody.core_route_stanza = core_route_stanza;