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 local valid_stanzas = { message = true, presence = true, iq = true };
  23 local function handle_unhandled_stanza(host, origin, stanza) --luacheck: ignore 212/host
  24         local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns or "jabber:client", origin.type;
  25         if xmlns == "jabber:client" and valid_stanzas[name] then
  26                 -- A normal stanza
  27                 local st_type = stanza.attr.type;
  28                 if st_type == "error" or (name == "iq" and st_type == "result") then
  29                         if st_type == "error" then
  30                                 local err_type, err_condition, err_message = stanza:get_error();
  31                                 log("debug", "Discarding unhandled error %s (%s, %s) from %s: %s",
  32                                         name, err_type, err_condition or "unknown condition", origin_type, stanza:top_tag());
  33                         else
  34                                 log("debug", "Discarding %s from %s of type: %s", name, origin_type, st_type or '<nil>');
  35                         end
  36                         return;
  37                 end
  38                 if name == "iq" and (st_type == "get" or st_type == "set") and stanza.tags[1] then
  39                         xmlns = stanza.tags[1].attr.xmlns or "jabber:client";
  40                 end
  41                 log("debug", "Unhandled %s stanza: %s; xmlns=%s", origin_type, name, xmlns);
  42                 if origin.send then
  43                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
  44                 end
  45         else
  46                 log("warn", "Unhandled %s stream element or stanza: %s; xmlns=%s: %s",
  47                         origin_type, name, xmlns, tostring(stanza)); -- we didn't handle it
  48                 origin:close("unsupported-stanza-type");
  49         end
  50 end
  51
  52 local iq_types = { set=true, get=true, result=true, error=true };
  53 function core_process_stanza(origin, stanza)
  54         (origin.log or log)("debug", "Received[%s]: %s", origin.type, stanza:top_tag())
  55
  56         if origin.type == "c2s" and not stanza.attr.xmlns then
  57                 local name, st_type = stanza.name, stanza.attr.type;
  58                 if st_type == "error" and #stanza.tags == 0 then
  59                         return handle_unhandled_stanza(origin.host, origin, stanza);
  60                 end
  61                 if name == "iq" then
  62                         if not iq_types[st_type] then
  63                                 origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid IQ type"));
  64                                 return;
  65                         elseif not stanza.attr.id then
  66                                 origin.send(st.error_reply(stanza, "modify", "bad-request", "Missing required 'id' attribute"));
  67                                 return;
  68                         elseif (st_type == "set" or st_type == "get") and (#stanza.tags ~= 1) then
  69                                 origin.send(st.error_reply(stanza, "modify", "bad-request", "Incorrect number of children for IQ stanza"));
  70                                 return;
  71                         end
  72                 end
  73
  74                 -- TODO also, stanzas should be returned to their original state before the function ends
  75                 stanza.attr.from = origin.full_jid;
  76         end
  77         local to, xmlns = stanza.attr.to, stanza.attr.xmlns;
  78         local from = stanza.attr.from;
  79         local node, host, resource;
  80         local from_node, from_host, from_resource;
  81         local to_bare, from_bare;
  82         if to then
  83                 if full_sessions[to] or bare_sessions[to] or hosts[to] then
  84                         node, host = jid_split(to); -- TODO only the host is needed, optimize
  85                 else
  86                         node, host, resource = jid_prepped_split(to);
  87                         if not host then
  88                                 log("warn", "Received stanza with invalid destination JID: %s", to);
  89                                 if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
  90                                         origin.send(st.error_reply(stanza, "modify", "jid-malformed", "The destination address is invalid: "..to));
  91                                 end
  92                                 return;
  93                         end
  94                         to_bare = node and (node.."@"..host) or host; -- bare JID
  95                         if resource then to = to_bare.."/"..resource; else to = to_bare; end
  96                         stanza.attr.to = to;
  97                 end
  98         end
  99         if from and not origin.full_jid then
 100                 -- We only stamp the 'from' on c2s stanzas, so we still need to check validity
 101                 from_node, from_host, from_resource = jid_prepped_split(from);
 102                 if not from_host then
 103                         log("warn", "Received stanza with invalid source JID: %s", from);
 104                         if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
 105                                 origin.send(st.error_reply(stanza, "modify", "jid-malformed", "The source address is invalid: "..from));
 106                         end
 107                         return;
 108                 end
 109                 from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
 110                 if from_resource then from = from_bare.."/"..from_resource; else from = from_bare; end
 111                 stanza.attr.from = from;
 112         end
 113
 114         if (origin.type == "s2sin" or origin.type == "s2sout" or origin.type == "c2s" or origin.type == "component") and xmlns == nil then
 115                 if (origin.type == "s2sin" or origin.type == "s2sout") and not origin.dummy then
 116                         local host_status = origin.hosts[from_host];
 117                         if not host_status or not host_status.authed then -- remote server trying to impersonate some other server?
 118                                 log("warn", "Received a stanza claiming to be from %s, over a stream authed for %s!", from_host, origin.from_host);
 119                                 origin:close("not-authorized");
 120                                 return;
 121                         elseif not hosts[host] then
 122                                 log("warn", "Remote server %s sent us a stanza for %s, closing stream", origin.from_host, host);
 123                                 origin:close("host-unknown");
 124                                 return;
 125                         end
 126                 end
 127                 core_post_stanza(origin, stanza, origin.full_jid);
 128         else
 129                 local h = hosts[stanza.attr.to or origin.host or origin.to_host];
 130                 if h then
 131                         local event;
 132                         if xmlns == nil then
 133                                 if stanza.name == "iq" and (stanza.attr.type == "set" or stanza.attr.type == "get")
 134                                         and stanza.tags[1] and stanza.tags[1].attr.xmlns then
 135                                         event = "stanza/iq/"..stanza.tags[1].attr.xmlns..":"..stanza.tags[1].name;
 136                                 else
 137                                         event = "stanza/"..stanza.name;
 138                                 end
 139                         else
 140                                 event = "stanza/"..xmlns..":"..stanza.name;
 141                         end
 142                         if h.events.fire_event(event, {origin = origin, stanza = stanza}) then return; end
 143                 end
 144                 if host and not hosts[host] then host = nil; end -- COMPAT: workaround for a Pidgin bug which sets 'to' to the SRV result
 145                 handle_unhandled_stanza(host or origin.host or origin.to_host, origin, stanza);
 146         end
 147 end
 148
 149 function core_post_stanza(origin, stanza, preevents)
 150         local to = stanza.attr.to;
 151         local node, host, resource = jid_split(to);
 152         local to_bare = node and (node.."@"..host) or host; -- bare JID
 153
 154         local to_type, to_self;
 155         if node then
 156                 if resource then
 157                         to_type = '/full';
 158                 else
 159                         to_type = '/bare';
 160                         if node == origin.username and host == origin.host then
 161                                 stanza.attr.to = nil;
 162                                 to_self = true;
 163                         end
 164                 end
 165         else
 166                 if host then
 167                         to_type = '/host';
 168                 else
 169                         to_type = '/bare';
 170                         to_self = true;
 171                 end
 172         end
 173
 174         local event_data = {origin=origin, stanza=stanza};
 175         if preevents then -- c2s connection
 176                 if hosts[origin.host].events.fire_event('pre-'..stanza.name..to_type, event_data) then return; end -- do preprocessing
 177         end
 178         local h = hosts[to_bare] or hosts[host or origin.host];
 179         if h then
 180                 if h.events.fire_event(stanza.name..to_type, event_data) then return; end -- do processing
 181                 if to_self and h.events.fire_event(stanza.name..'/self', event_data) then return; end -- do processing
 182                 handle_unhandled_stanza(h.host, origin, stanza);
 183         else
 184                 core_route_stanza(origin, stanza);
 185         end
 186 end
 187
 188 function core_route_stanza(origin, stanza)
 189         local node, host, resource = jid_split(stanza.attr.to);
 190         local from_node, from_host, from_resource = jid_split(stanza.attr.from);
 191
 192         -- Auto-detect origin if not specified
 193         origin = origin or hosts[from_host];
 194         if not origin then return false; end
 195
 196         if hosts[host] then
 197                 -- old stanza routing code removed
 198                 core_post_stanza(origin, stanza);
 199         else
 200                 local host_session = hosts[from_host];
 201                 if not host_session then
 202                         log("error", "No hosts[from_host] (please report): %s", stanza);
 203                 else
 204                         local xmlns = stanza.attr.xmlns;
 205                         stanza.attr.xmlns = nil;
 206                         local routed = host_session.events.fire_event("route/remote", {
 207                                 origin = origin, stanza = stanza, from_host = from_host, to_host = host });
 208                         stanza.attr.xmlns = xmlns; -- reset
 209                         if not routed then
 210                                 log("debug", "Could not route stanza to remote");
 211                                 if stanza.attr.type == "error" or (stanza.name == "iq" and stanza.attr.type == "result") then return; end
 212                                 core_route_stanza(host_session, st.error_reply(stanza, "cancel", "not-allowed",
 213                                         "Communication with remote domains is not enabled"));
 214                         end
 215                 end
 216         end
 217 end
 218
 219 --luacheck: ignore 122/prosody
 220 prosody.core_process_stanza = core_process_stanza;
 221 prosody.core_post_stanza = core_post_stanza;
 222 prosody.core_route_stanza = core_route_stanza;