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 send_s2s = require "core.s2smanager".send_to_host;
  15 local jid_split = require "util.jid".split;
  16 local jid_prepped_split = require "util.jid".prepped_split;
  17
  18 local full_sessions = _G.prosody.full_sessions;
  19 local bare_sessions = _G.prosody.bare_sessions;
  20
  21 local function handle_unhandled_stanza(host, origin, stanza)
  22         local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns or "jabber:client", origin.type;
  23         if name == "iq" and xmlns == "jabber:client" then
  24                 if stanza.attr.type == "get" or stanza.attr.type == "set" then
  25                         xmlns = stanza.tags[1].attr.xmlns or "jabber:client";
  26                         log("debug", "Stanza of type %s from %s has xmlns: %s", name, origin_type, xmlns);
  27                 else
  28                         log("debug", "Discarding %s from %s of type: %s", name, origin_type, stanza.attr.type);
  29                         return true;
  30                 end
  31         end
  32         if stanza.attr.xmlns == nil then
  33                 log("debug", "Unhandled %s stanza: %s; xmlns=%s", origin.type, stanza.name, xmlns); -- we didn't handle it
  34                 if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
  35                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
  36                 end
  37         elseif not((name == "features" or name == "error") and xmlns == "http://etherx.jabber.org/streams") then -- FIXME remove check once we handle S2S features
  38                 log("warn", "Unhandled %s stream element: %s; xmlns=%s: %s", origin.type, stanza.name, xmlns, tostring(stanza)); -- we didn't handle it
  39                 origin:close("unsupported-stanza-type");
  40         end
  41 end
  42
  43 local iq_types = { set=true, get=true, result=true, error=true };
  44 function core_process_stanza(origin, stanza)
  45         (origin.log or log)("debug", "Received[%s]: %s", origin.type, stanza:top_tag())
  46
  47         -- TODO verify validity of stanza (as well as JID validity)
  48         if stanza.attr.type == "error" and #stanza.tags == 0 then return; end -- TODO invalid stanza, log
  49         if stanza.name == "iq" then
  50                 if not stanza.attr.id then stanza.attr.id = ""; end -- COMPAT Jabiru doesn't send the id attribute on roster requests
  51                 if not iq_types[stanza.attr.type] or ((stanza.attr.type == "set" or stanza.attr.type == "get") and (#stanza.tags ~= 1)) then
  52                         origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid IQ type or incorrect number of children"));
  53                         return;
  54                 end
  55         end
  56
  57         if origin.type == "c2s" and not stanza.attr.xmlns then
  58                 if not origin.full_jid
  59                         and not(stanza.name == "iq" and stanza.attr.type == "set" and stanza.tags[1] and stanza.tags[1].name == "bind"
  60                                         and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then
  61                         -- authenticated client isn't bound and current stanza is not a bind request
  62                         if stanza.attr.type ~= "result" and stanza.attr.type ~= "error" then
  63                                 origin.send(st.error_reply(stanza, "auth", "not-authorized")); -- FIXME maybe allow stanzas to account or server
  64                         end
  65                         return;
  66                 end
  67
  68                 -- TODO also, stanzas should be returned to their original state before the function ends
  69                 stanza.attr.from = origin.full_jid;
  70         end
  71         local to, xmlns = stanza.attr.to, stanza.attr.xmlns;
  72         local from = stanza.attr.from;
  73         local node, host, resource;
  74         local from_node, from_host, from_resource;
  75         local to_bare, from_bare;
  76         if to then
  77                 if full_sessions[to] or bare_sessions[to] or hosts[to] then
  78                         node, host = jid_split(to); -- TODO only the host is needed, optimize
  79                 else
  80                         node, host, resource = jid_prepped_split(to);
  81                         if not host then
  82                                 log("warn", "Received stanza with invalid destination JID: %s", to);
  83                                 if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
  84                                         origin.send(st.error_reply(stanza, "modify", "jid-malformed", "The destination address is invalid: "..to));
  85                                 end
  86                                 return;
  87                         end
  88                         to_bare = node and (node.."@"..host) or host; -- bare JID
  89                         if resource then to = to_bare.."/"..resource; else to = to_bare; end
  90                         stanza.attr.to = to;
  91                 end
  92         end
  93         if from and not origin.full_jid then
  94                 -- We only stamp the 'from' on c2s stanzas, so we still need to check validity
  95                 from_node, from_host, from_resource = jid_prepped_split(from);
  96                 if not from_host then
  97                         log("warn", "Received stanza with invalid source JID: %s", from);
  98                         if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
  99                                 origin.send(st.error_reply(stanza, "modify", "jid-malformed", "The source address is invalid: "..from));
 100                         end
 101                         return;
 102                 end
 103                 from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
 104                 if from_resource then from = from_bare.."/"..from_resource; else from = from_bare; end
 105                 stanza.attr.from = from;
 106         end
 107
 108         --[[if to and not(hosts[to]) and not(hosts[to_bare]) and (hosts[host] and hosts[host].type ~= "local") then -- not for us?
 109                 log("warn", "stanza recieved for a non-local server");
 110                 return; -- FIXME what should we do here?
 111         end]] -- FIXME
 112
 113         if (origin.type == "s2sin" or origin.type == "c2s" or origin.type == "component") and xmlns == nil then
 114                 if origin.type == "s2sin" and not origin.dummy then
 115                         local host_status = origin.hosts[from_host];
 116                         if not host_status or not host_status.authed then -- remote server trying to impersonate some other server?
 117                                 log("warn", "Received a stanza claiming to be from %s, over a stream authed for %s!", from_host, origin.from_host);
 118                                 return; -- FIXME what should we do here? does this work with subdomains?
 119                         end
 120                 end
 121                 core_post_stanza(origin, stanza, origin.full_jid);
 122         else
 123                 local h = hosts[stanza.attr.to or origin.host or origin.to_host];
 124                 if h then
 125                         local event;
 126                         if xmlns == nil then
 127                                 if stanza.name == "iq" and (stanza.attr.type == "set" or stanza.attr.type == "get") then
 128                                         event = "stanza/iq/"..stanza.tags[1].attr.xmlns..":"..stanza.tags[1].name;
 129                                 else
 130                                         event = "stanza/"..stanza.name;
 131                                 end
 132                         else
 133                                 event = "stanza/"..xmlns..":"..stanza.name;
 134                         end
 135                         if h.events.fire_event(event, {origin = origin, stanza = stanza}) then return; end
 136                 end
 137                 if host and not hosts[host] then host = nil; end -- COMPAT: workaround for a Pidgin bug which sets 'to' to the SRV result
 138                 handle_unhandled_stanza(host or origin.host or origin.to_host, origin, stanza);
 139         end
 140 end
 141
 142 function core_post_stanza(origin, stanza, preevents)
 143         local to = stanza.attr.to;
 144         local node, host, resource = jid_split(to);
 145         local to_bare = node and (node.."@"..host) or host; -- bare JID
 146
 147         local to_type, to_self;
 148         if node then
 149                 if resource then
 150                         to_type = '/full';
 151                 else
 152                         to_type = '/bare';
 153                         if node == origin.username and host == origin.host then
 154                                 stanza.attr.to = nil;
 155                                 to_self = true;
 156                         end
 157                 end
 158         else
 159                 if host then
 160                         to_type = '/host';
 161                 else
 162                         to_type = '/bare';
 163                         to_self = true;
 164                 end
 165         end
 166
 167         local event_data = {origin=origin, stanza=stanza};
 168         if preevents then -- c2s connection
 169                 if hosts[origin.host].events.fire_event('pre-'..stanza.name..to_type, event_data) then return; end -- do preprocessing
 170         end
 171         local h = hosts[to_bare] or hosts[host or origin.host];
 172         if h then
 173                 if h.events.fire_event(stanza.name..to_type, event_data) then return; end -- do processing
 174                 if to_self and h.events.fire_event(stanza.name..'/self', event_data) then return; end -- do processing
 175                 handle_unhandled_stanza(h.host, origin, stanza);
 176         else
 177                 core_route_stanza(origin, stanza);
 178         end
 179 end
 180
 181 function core_route_stanza(origin, stanza)
 182         local node, host, resource = jid_split(stanza.attr.to);
 183         local from_node, from_host, from_resource = jid_split(stanza.attr.from);
 184
 185         -- Auto-detect origin if not specified
 186         origin = origin or hosts[from_host];
 187         if not origin then return false; end
 188
 189         if hosts[host] then
 190                 -- old stanza routing code removed
 191                 core_post_stanza(origin, stanza);
 192         elseif origin.type == "c2s" then
 193                 -- Remote host
 194                 if not hosts[from_host] then
 195                         log("error", "No hosts[from_host] (please report): %s", tostring(stanza));
 196                 end
 197                 if (not hosts[from_host]) or (not hosts[from_host].disallow_s2s) then
 198                         local xmlns = stanza.attr.xmlns;
 199                         --stanza.attr.xmlns = "jabber:server";
 200                         stanza.attr.xmlns = nil;
 201                         log("debug", "sending s2s stanza: %s", tostring(stanza.top_tag and stanza:top_tag()) or stanza);
 202                         send_s2s(origin.host, host, stanza); -- TODO handle remote routing errors
 203                         stanza.attr.xmlns = xmlns; -- reset
 204                 else
 205                         core_route_stanza(hosts[from_host], st.error_reply(stanza, "cancel", "not-allowed", "Communication with remote servers is not allowed"));
 206                 end
 207         elseif origin.type == "component" or origin.type == "local" then
 208                 -- Route via s2s for components and modules
 209                 log("debug", "Routing outgoing stanza for %s to %s", from_host, host);
 210                 send_s2s(from_host, host, stanza);
 211         else
 212                 log("warn", "received %s stanza from unhandled connection type: %s", tostring(stanza.name), tostring(origin.type));
 213         end
 214 end