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