core/stanza_router.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2009 Matthew Wild
   3 -- Copyright (C) 2008-2009 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.hosts;
  12 local tostring = tostring;
  13 local st = require "util.stanza";
  14 local send_s2s = require "core.s2smanager".send_to_host;
  15 local modules_handle_stanza = require "core.modulemanager".handle_stanza;
  16 local component_handle_stanza = require "core.componentmanager".handle_stanza;
  17 local jid_split = require "util.jid".split;
  18 local jid_prepped_split = require "util.jid".prepped_split;
  19
  20 function core_process_stanza(origin, stanza)
  21         (origin.log or log)("debug", "Received[%s]: %s", origin.type, stanza:top_tag())
  22
  23         -- Currently we guarantee every stanza to have an xmlns, should we keep this rule?
  24         if not stanza.attr.xmlns then stanza.attr.xmlns = "jabber:client"; end
  25
  26         -- TODO verify validity of stanza (as well as JID validity)
  27         if stanza.attr.type == "error" and #stanza.tags == 0 then return; end -- TODO invalid stanza, log
  28         if stanza.name == "iq" then
  29                 if (stanza.attr.type == "set" or stanza.attr.type == "get") and #stanza.tags ~= 1 then
  30                         origin.send(st.error_reply(stanza, "modify", "bad-request"));
  31                         return;
  32                 end
  33         end
  34
  35         if origin.type == "c2s" then
  36                 if not origin.full_jid
  37                         and not(stanza.name == "iq" and stanza.attr.type == "set" and stanza.tags[1] and stanza.tags[1].name == "bind"
  38                                         and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then
  39                         -- authenticated client isn't bound and current stanza is not a bind request
  40                         origin.send(st.error_reply(stanza, "auth", "not-authorized")); -- FIXME maybe allow stanzas to account or server
  41                         return;
  42                 end
  43
  44                 -- TODO also, stanzas should be returned to their original state before the function ends
  45                 stanza.attr.from = origin.full_jid;
  46         end
  47         local to, xmlns = stanza.attr.to, stanza.attr.xmlns;
  48         local from = stanza.attr.from;
  49         local node, host, resource;
  50         local from_node, from_host, from_resource;
  51         local to_bare, from_bare;
  52         if to then
  53                 if full_sessions[to] or bare_sessions[to] or hosts[to] then
  54                         node, host = jid_split(to); -- TODO only the host is needed, optimize
  55                 else
  56                         node, host, resource = jid_prepped_split(to);
  57                         if not host then
  58                                 log("warn", "Received stanza with invalid destination JID: %s", to);
  59                                 if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
  60                                         origin.send(st.error_reply(stanza, "modify", "jid-malformed", "The destination address is invalid: "..to));
  61                                 end
  62                                 return;
  63                         end
  64                         to_bare = node and (node.."@"..host) or host; -- bare JID
  65                         if resource then to = to_bare.."/"..resource; else to = to_bare; end
  66                         stanza.attr.to = to;
  67                 end
  68         end
  69         if from and not origin.full_jid then
  70                 -- We only stamp the 'from' on c2s stanzas, so we still need to check validity
  71                 from_node, from_host, from_resource = jid_prepped_split(from);
  72                 if not from_host then
  73                         log("warn", "Received stanza with invalid source JID: %s", from);
  74                         if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
  75                                 origin.send(st.error_reply(stanza, "modify", "jid-malformed", "The source address is invalid: "..from));
  76                         end
  77                         return;
  78                 end
  79                 from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
  80                 if from_resource then from = from_bare.."/"..from_resource; else from = from_bare; end
  81                 stanza.attr.from = from;
  82         end
  83
  84         --[[if to and not(hosts[to]) and not(hosts[to_bare]) and (hosts[host] and hosts[host].type ~= "local") then -- not for us?
  85                 log("warn", "stanza recieved for a non-local server");
  86                 return; -- FIXME what should we do here?
  87         end]] -- FIXME
  88
  89         if (origin.type == "s2sin" or origin.type == "c2s" or origin.type == "component") and xmlns == "jabber:client" then
  90                 if origin.type == "s2sin" and not origin.dummy then
  91                         local host_status = origin.hosts[from_host];
  92                         if not host_status or not host_status.authed then -- remote server trying to impersonate some other server?
  93                                 log("warn", "Received a stanza claiming to be from %s, over a stream authed for %s!", from_host, origin.from_host);
  94                                 return; -- FIXME what should we do here? does this work with subdomains?
  95                         end
  96                 end
  97                 core_post_stanza(origin, stanza);
  98         else
  99                 local h = hosts[stanza.attr.to or origin.host or origin.to_host];
 100                 if h then
 101                         local event;
 102                         if stanza.attr.xmlns == "jabber:client" then
 103                                 if stanza.name == "iq" and (stanza.attr.type == "set" or stanza.attr.type == "get") then
 104                                         event = "stanza/iq/"..stanza.tags[1].attr.xmlns..":"..stanza.tags[1].name;
 105                                 else
 106                                         event = "stanza/"..stanza.name;
 107                                 end
 108                         else
 109                                 event = "stanza/"..stanza.attr.xmlns..":"..stanza.name;
 110                         end
 111                         if h.events.fire_event(event, {origin = origin, stanza = stanza}) then return; end
 112                 end
 113                 if host and not hosts[host] then host = nil; end -- workaround for a Pidgin bug which sets 'to' to the SRV result
 114                 modules_handle_stanza(host or origin.host or origin.to_host, origin, stanza);
 115         end
 116 end
 117
 118 function core_post_stanza(origin, stanza)
 119         local to = stanza.attr.to;
 120         local node, host, resource = jid_split(to);
 121         local to_bare = node and (node.."@"..host) or host; -- bare JID
 122
 123         local to_type;
 124         if node then
 125                 if resource then
 126                         to_type = '/full';
 127                 else
 128                         to_type = '/bare';
 129                         if node == origin.username and host == origin.host then
 130                                 stanza.attr.to = nil;
 131                         end
 132                 end
 133         else
 134                 if host then
 135                         to_type = '/host';
 136                 else
 137                         to_type = '/bare';
 138                 end
 139         end
 140
 141         local event_data = {origin=origin, stanza=stanza};
 142         if origin.full_jid == stanza.attr.from then -- c2s connection
 143                 if hosts[origin.host].events.fire_event('pre-'..stanza.name..to_type, event_data) then return; end -- do preprocessing
 144         end
 145         local h = hosts[to_bare] or hosts[host or origin.host];
 146         if h then
 147                 if h.events.fire_event(stanza.name..to_type, event_data) then return; end -- do processing
 148
 149                 if h.type == "component" then
 150                         component_handle_stanza(origin, stanza);
 151                         return;
 152                 end
 153                 modules_handle_stanza(h.host, origin, stanza);
 154         else
 155                 core_route_stanza(origin, stanza);
 156         end
 157 end
 158
 159 function core_route_stanza(origin, stanza)
 160         local node, host, resource = jid_split(stanza.attr.to);
 161         local from_node, from_host, from_resource = jid_split(stanza.attr.from);
 162
 163         -- Auto-detect origin if not specified
 164         origin = origin or hosts[from_host];
 165         if not origin then return false; end
 166
 167         if hosts[host] then
 168                 -- old stanza routing code removed
 169                 core_post_stanza(origin, stanza);
 170         elseif origin.type == "c2s" then
 171                 -- Remote host
 172                 if not hosts[from_host] then
 173                         log("error", "No hosts[from_host] (please report): %s", tostring(stanza));
 174                 end
 175                 if (not hosts[from_host]) or (not hosts[from_host].disallow_s2s) then
 176                         local xmlns = stanza.attr.xmlns;
 177                         --stanza.attr.xmlns = "jabber:server";
 178                         stanza.attr.xmlns = nil;
 179                         log("debug", "sending s2s stanza: %s", tostring(stanza));
 180                         send_s2s(origin.host, host, stanza); -- TODO handle remote routing errors
 181                         stanza.attr.xmlns = xmlns; -- reset
 182                 else
 183                         core_route_stanza(hosts[from_host], st.error_reply(stanza, "cancel", "not-allowed", "Communication with remote servers is not allowed"));
 184                 end
 185         elseif origin.type == "component" or origin.type == "local" then
 186                 -- Route via s2s for components and modules
 187                 log("debug", "Routing outgoing stanza for %s to %s", from_host, host);
 188                 send_s2s(from_host, host, stanza);
 189         else
 190                 log("warn", "received stanza from unhandled connection type: %s", origin.type);
 191         end
 192 end