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 valid_stanzas = { message = true, presence = true, iq = true };
  33 local function handle_unhandled_stanza(host, origin, stanza) --luacheck: ignore 212/host
  34         local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns or "jabber:client", origin.type;
  35         if xmlns == "jabber:client" and valid_stanzas[name] then
  36                 -- A normal stanza
  37                 local st_type = stanza.attr.type;
  38                 if st_type == "error" or (name == "iq" and st_type == "result") then
  39                         log("debug", "Discarding %s from %s of type: %s", name, origin_type, st_type or '<nil>');
  40                         return;
  41                 end
  42                 if name == "iq" and (st_type == "get" or st_type == "set") and stanza.tags[1] then
  43                         xmlns = stanza.tags[1].attr.xmlns or "jabber:client";
  44                 end
  45                 log("debug", "Unhandled %s stanza: %s; xmlns=%s", origin_type, name, xmlns);
  46                 if origin.send then
  47                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
  48                 end
  49         else
  50                 log("warn", "Unhandled %s stream element or stanza: %s; xmlns=%s: %s", origin_type, name, xmlns, tostring(stanza)); -- we didn't handle it
  51                 origin:close("unsupported-stanza-type");
  52         end
  53 end
  54
  55 local iq_types = { set=true, get=true, result=true, error=true };
  56 function core_process_stanza(origin, stanza)
  57         (origin.log or log)("debug", "Received[%s]: %s", origin.type, stanza:top_tag())
  58
  59         if origin.type == "c2s" and not stanza.attr.xmlns then
  60                 local name, st_type = stanza.name, stanza.attr.type;
  61                 if st_type == "error" and #stanza.tags == 0 then
  62                         return handle_unhandled_stanza(origin.host, origin, stanza);
  63                 end
  64                 if name == "iq" then
  65                         if not stanza.attr.id then stanza.attr.id = ""; end -- COMPAT Jabiru doesn't send the id attribute on roster requests
  66                         if not iq_types[st_type] or ((st_type == "set" or st_type == "get") and (#stanza.tags ~= 1)) then
  67                                 origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid IQ type or incorrect number of children"));
  68                                 return;
  69                         end
  70                 end
  71
  72                 if not origin.full_jid
  73                         and not(name == "iq" and st_type == "set" and stanza.tags[1] and stanza.tags[1].name == "bind"
  74                                         and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then
  75                         -- authenticated client isn't bound and current stanza is not a bind request
  76                         if stanza.attr.type ~= "result" and stanza.attr.type ~= "error" then
  77                                 origin.send(st.error_reply(stanza, "auth", "not-authorized")); -- FIXME maybe allow stanzas to account or server
  78                         end
  79                         return;
  80                 end
  81
  82                 -- TODO also, stanzas should be returned to their original state before the function ends
  83                 stanza.attr.from = origin.full_jid;
  84         end
  85         local to, xmlns = stanza.attr.to, stanza.attr.xmlns;
  86         local from = stanza.attr.from;
  87         local node, host, resource;
  88         local from_node, from_host, from_resource;
  89         local to_bare, from_bare;
  90         if to then
  91                 if full_sessions[to] or bare_sessions[to] or hosts[to] then
  92                         node, host = jid_split(to); -- TODO only the host is needed, optimize
  93                 else
  94                         node, host, resource = jid_prepped_split(to);
  95                         if not host then
  96                                 log("warn", "Received stanza with invalid destination JID: %s", to);
  97                                 if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
  98                                         origin.send(st.error_reply(stanza, "modify", "jid-malformed", "The destination address is invalid: "..to));
  99                                 end
 100                                 return;
 101                         end
 102                         to_bare = node and (node.."@"..host) or host; -- bare JID
 103                         if resource then to = to_bare.."/"..resource; else to = to_bare; end
 104                         stanza.attr.to = to;
 105                 end
 106         end
 107         if from and not origin.full_jid then
 108                 -- We only stamp the 'from' on c2s stanzas, so we still need to check validity
 109                 from_node, from_host, from_resource = jid_prepped_split(from);
 110                 if not from_host then
 111                         log("warn", "Received stanza with invalid source JID: %s", from);
 112                         if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
 113                                 origin.send(st.error_reply(stanza, "modify", "jid-malformed", "The source address is invalid: "..from));
 114                         end
 115                         return;
 116                 end
 117                 from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
 118                 if from_resource then from = from_bare.."/"..from_resource; else from = from_bare; end
 119                 stanza.attr.from = from;
 120         end
 121
 122         if (origin.type == "s2sin" or origin.type == "c2s" or origin.type == "component") and xmlns == nil then
 123                 if origin.type == "s2sin" and not origin.dummy then
 124                         local host_status = origin.hosts[from_host];
 125                         if not host_status or not host_status.authed then -- remote server trying to impersonate some other server?
 126                                 log("warn", "Received a stanza claiming to be from %s, over a stream authed for %s!", from_host, origin.from_host);
 127                                 origin:close("not-authorized");
 128                                 return;
 129                         elseif not hosts[host] then
 130                                 log("warn", "Remote server %s sent us a stanza for %s, closing stream", origin.from_host, host);
 131                                 origin:close("host-unknown");
 132                                 return;
 133                         end
 134                 end
 135                 core_post_stanza(origin, stanza, origin.full_jid);
 136         else
 137                 local h = hosts[stanza.attr.to or origin.host or origin.to_host];
 138                 if h then
 139                         local event;
 140                         if xmlns == nil then
 141                                 if stanza.name == "iq" and (stanza.attr.type == "set" or stanza.attr.type == "get") then
 142                                         event = "stanza/iq/"..stanza.tags[1].attr.xmlns..":"..stanza.tags[1].name;
 143                                 else
 144                                         event = "stanza/"..stanza.name;
 145                                 end
 146                         else
 147                                 event = "stanza/"..xmlns..":"..stanza.name;
 148                         end
 149                         if h.events.fire_event(event, {origin = origin, stanza = stanza}) then return; end
 150                 end
 151                 if host and not hosts[host] then host = nil; end -- COMPAT: workaround for a Pidgin bug which sets 'to' to the SRV result
 152                 handle_unhandled_stanza(host or origin.host or origin.to_host, origin, stanza);
 153         end
 154 end
 155
 156 function core_post_stanza(origin, stanza, preevents)
 157         local to = stanza.attr.to;
 158         local node, host, resource = jid_split(to);
 159         local to_bare = node and (node.."@"..host) or host; -- bare JID
 160
 161         local to_type, to_self;
 162         if node then
 163                 if resource then
 164                         to_type = '/full';
 165                 else
 166                         to_type = '/bare';
 167                         if node == origin.username and host == origin.host then
 168                                 stanza.attr.to = nil;
 169                                 to_self = true;
 170                         end
 171                 end
 172         else
 173                 if host then
 174                         to_type = '/host';
 175                 else
 176                         to_type = '/bare';
 177                         to_self = true;
 178                 end
 179         end
 180
 181         local event_data = {origin=origin, stanza=stanza};
 182         if preevents then -- c2s connection
 183                 if hosts[origin.host].events.fire_event('pre-'..stanza.name..to_type, event_data) then return; end -- do preprocessing
 184         end
 185         local h = hosts[to_bare] or hosts[host or origin.host];
 186         if h then
 187                 if h.events.fire_event(stanza.name..to_type, event_data) then return; end -- do processing
 188                 if to_self and h.events.fire_event(stanza.name..'/self', event_data) then return; end -- do processing
 189                 handle_unhandled_stanza(h.host, origin, stanza);
 190         else
 191                 core_route_stanza(origin, stanza);
 192         end
 193 end
 194
 195 function core_route_stanza(origin, stanza)
 196         local node, host, resource = jid_split(stanza.attr.to);
 197         local from_node, from_host, from_resource = jid_split(stanza.attr.from);
 198
 199         -- Auto-detect origin if not specified
 200         origin = origin or hosts[from_host];
 201         if not origin then return false; end
 202
 203         if hosts[host] then
 204                 -- old stanza routing code removed
 205                 core_post_stanza(origin, stanza);
 206         else
 207                 log("debug", "Routing to remote...");
 208                 local host_session = hosts[from_host];
 209                 if not host_session then
 210                         log("error", "No hosts[from_host] (please report): %s", tostring(stanza));
 211                 else
 212                         local xmlns = stanza.attr.xmlns;
 213                         stanza.attr.xmlns = nil;
 214                         local routed = host_session.events.fire_event("route/remote", { origin = origin, stanza = stanza, from_host = from_host, to_host = host });
 215                         stanza.attr.xmlns = xmlns; -- reset
 216                         if not routed then
 217                                 log("debug", "... no, just kidding.");
 218                                 if stanza.attr.type == "error" or (stanza.name == "iq" and stanza.attr.type == "result") then return; end
 219                                 core_route_stanza(host_session, st.error_reply(stanza, "cancel", "not-allowed", "Communication with remote domains is not enabled"));
 220                         end
 221                 end
 222         end
 223 end
 224
 225 --luacheck: ignore 122/prosody
 226 prosody.core_process_stanza = core_process_stanza;
 227 prosody.core_post_stanza = core_post_stanza;
 228 prosody.core_route_stanza = core_route_stanza;