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