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230 lines
8.6 KiB
Lua
230 lines
8.6 KiB
Lua
-- Prosody IM
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-- Copyright (C) 2008-2010 Matthew Wild
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-- Copyright (C) 2008-2010 Waqas Hussain
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--
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-- This project is MIT/X11 licensed. Please see the
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-- COPYING file in the source package for more information.
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--
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local log = require "prosody.util.logger".init("stanzarouter")
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local hosts = _G.prosody.hosts;
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local tostring = tostring;
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local st = require "prosody.util.stanza";
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local jid_split = require "prosody.util.jid".split;
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local jid_host = require "prosody.util.jid".host;
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local jid_prepped_split = require "prosody.util.jid".prepped_split;
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local full_sessions = _G.prosody.full_sessions;
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local bare_sessions = _G.prosody.bare_sessions;
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local core_post_stanza, core_process_stanza, core_route_stanza;
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local valid_stanzas = { message = true, presence = true, iq = true };
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local function handle_unhandled_stanza(host, origin, stanza) --luacheck: ignore 212/host
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local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns or "jabber:client", origin.type;
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if xmlns == "jabber:client" and valid_stanzas[name] then
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-- A normal stanza
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local st_type = stanza.attr.type;
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if st_type == "error" or (name == "iq" and st_type == "result") then
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if st_type == "error" then
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local err_type, err_condition, err_message = stanza:get_error(); -- luacheck: ignore 211/err_message
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log("debug", "Discarding unhandled error %s (%s, %s) from %s: %s",
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name, err_type, err_condition or "unknown condition", origin_type, stanza:top_tag());
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else
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log("debug", "Discarding %s from %s of type: %s", name, origin_type, st_type or '<nil>');
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end
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return;
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end
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if name == "iq" and (st_type == "get" or st_type == "set") and stanza.tags[1] then
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xmlns = stanza.tags[1].attr.xmlns or "jabber:client";
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end
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log("debug", "Unhandled %s stanza: %s; xmlns=%s", origin_type, name, xmlns);
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if origin.send then
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origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
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end
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else
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log("warn", "Unhandled %s stream element or stanza: %s; xmlns=%s: %s",
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origin_type, name, xmlns, tostring(stanza)); -- we didn't handle it
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origin:close("unsupported-stanza-type");
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end
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end
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local iq_types = { set=true, get=true, result=true, error=true };
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function core_process_stanza(origin, stanza)
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(origin.log or log)("debug", "Received[%s]: %s", origin.type, stanza:top_tag())
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if origin.type == "c2s" and not stanza.attr.xmlns then
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local name, st_type = stanza.name, stanza.attr.type;
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if st_type == "error" and #stanza.tags == 0 then
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return handle_unhandled_stanza(origin.host, origin, stanza);
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end
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if name == "iq" then
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if not iq_types[st_type] then
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origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid IQ type"));
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return;
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elseif not stanza.attr.id then
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origin.send(st.error_reply(stanza, "modify", "bad-request", "Missing required 'id' attribute"));
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return;
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elseif (st_type == "set" or st_type == "get") and (#stanza.tags ~= 1) then
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origin.send(st.error_reply(stanza, "modify", "bad-request", "Incorrect number of children for IQ stanza"));
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return;
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end
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end
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-- TODO also, stanzas should be returned to their original state before the function ends
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stanza.attr.from = origin.full_jid;
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end
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local to, xmlns = stanza.attr.to, stanza.attr.xmlns;
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local from = stanza.attr.from;
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local node, host, resource;
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local from_node, from_host, from_resource;
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local to_bare, from_bare;
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if to then
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if full_sessions[to] or bare_sessions[to] or hosts[to] then
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host = jid_host(to);
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else
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node, host, resource = jid_prepped_split(to);
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if not host then
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log("warn", "Received stanza with invalid destination JID: %s", to);
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if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
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origin.send(st.error_reply(stanza, "modify", "jid-malformed", "The destination address is invalid: "..to));
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end
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return;
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end
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to_bare = node and (node.."@"..host) or host; -- bare JID
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if resource then to = to_bare.."/"..resource; else to = to_bare; end
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stanza.attr.to = to;
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end
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end
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if from and not origin.full_jid then
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-- We only stamp the 'from' on c2s stanzas, so we still need to check validity
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from_node, from_host, from_resource = jid_prepped_split(from);
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if not from_host then
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log("warn", "Received stanza with invalid source JID: %s", from);
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if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
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origin.send(st.error_reply(stanza, "modify", "jid-malformed", "The source address is invalid: "..from));
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end
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return;
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end
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from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
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if from_resource then from = from_bare.."/"..from_resource; else from = from_bare; end
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stanza.attr.from = from;
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end
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if (origin.type == "s2sin" or origin.type == "s2sout" or origin.type == "c2s" or origin.type == "component") and xmlns == nil then
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if (origin.type == "s2sin" or origin.type == "s2sout") and not origin.dummy then
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local host_status = origin.hosts[from_host];
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if not host_status or not host_status.authed then -- remote server trying to impersonate some other server?
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log("warn", "Received a stanza claiming to be from %s, over a stream authed for %s!", from_host, origin.from_host);
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origin:close("not-authorized");
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return;
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elseif not hosts[host] then
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log("warn", "Remote server %s sent us a stanza for %s, closing stream", origin.from_host, host);
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origin:close("host-unknown");
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return;
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end
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end
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core_post_stanza(origin, stanza, origin.full_jid);
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else
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local h = hosts[stanza.attr.to or origin.host];
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if h then
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local event;
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if xmlns == nil then
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if stanza.name == "iq" and (stanza.attr.type == "set" or stanza.attr.type == "get")
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and stanza.tags[1] and stanza.tags[1].attr.xmlns then
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event = "stanza/iq/"..stanza.tags[1].attr.xmlns..":"..stanza.tags[1].name;
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else
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event = "stanza/"..stanza.name;
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end
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else
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event = "stanza/"..xmlns..":"..stanza.name;
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end
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if h.events.fire_event(event, {origin = origin, stanza = stanza}) then return; end
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end
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if host and not hosts[host] then host = nil; end -- COMPAT: workaround for a Pidgin bug which sets 'to' to the SRV result
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handle_unhandled_stanza(host or origin.host, origin, stanza);
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end
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end
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function core_post_stanza(origin, stanza, preevents)
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local to = stanza.attr.to;
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local node, host, resource = jid_split(to);
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local to_bare = node and (node.."@"..host) or host; -- bare JID
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local to_type, to_self;
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if node then
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if resource then
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to_type = '/full';
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else
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to_type = '/bare';
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if node == origin.username and host == origin.host then
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stanza.attr.to = nil;
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to_self = true;
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end
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end
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else
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if host then
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to_type = '/host';
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else
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to_type = '/bare';
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to_self = true;
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end
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end
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local event_data = {origin=origin, stanza=stanza, to_self=to_self};
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if preevents then -- c2s connection
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local result = hosts[origin.host].events.fire_event("pre-stanza", event_data);
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if result ~= nil then
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log("debug", "Stanza rejected by pre-stanza handler: %s", event_data.reason or "unknown reason");
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return;
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end
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if hosts[origin.host].events.fire_event('pre-'..stanza.name..to_type, event_data) then return; end -- do preprocessing
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end
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local h = hosts[to_bare] or hosts[host or origin.host];
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if h then
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if h.events.fire_event(stanza.name..to_type, event_data) then return; end -- do processing
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if to_self and h.events.fire_event(stanza.name..'/self', event_data) then return; end -- do processing
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handle_unhandled_stanza(h.host, origin, stanza);
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else
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core_route_stanza(origin, stanza);
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end
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end
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function core_route_stanza(origin, stanza)
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local to_host = jid_host(stanza.attr.to);
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local from_host = jid_host(stanza.attr.from);
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-- Auto-detect origin if not specified
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origin = origin or hosts[from_host];
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if not origin then return false; end
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if hosts[to_host] then
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-- old stanza routing code removed
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core_post_stanza(origin, stanza);
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else
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local host_session = hosts[from_host];
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if not host_session then
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log("error", "No hosts[from_host] (please report): %s", stanza);
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else
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local xmlns = stanza.attr.xmlns;
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stanza.attr.xmlns = nil;
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local routed = host_session.events.fire_event("route/remote", {
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origin = origin, stanza = stanza, from_host = from_host, to_host = to_host });
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stanza.attr.xmlns = xmlns; -- reset
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if not routed then
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log("debug", "Could not route stanza to remote");
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if stanza.attr.type == "error" or (stanza.name == "iq" and stanza.attr.type == "result") then return; end
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core_route_stanza(host_session, st.error_reply(stanza, "cancel", "not-allowed",
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"Communication with remote domains is not enabled"));
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end
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end
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end
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end
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--luacheck: ignore 122/prosody
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prosody.core_process_stanza = core_process_stanza;
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prosody.core_post_stanza = core_post_stanza;
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prosody.core_route_stanza = core_route_stanza;
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