diff options
Diffstat (limited to 'plugins/mod_component.lua')
| -rw-r--r-- | plugins/mod_component.lua | 335 |
1 files changed, 270 insertions, 65 deletions
diff --git a/plugins/mod_component.lua b/plugins/mod_component.lua index f7d09930..738124cc 100644 --- a/plugins/mod_component.lua +++ b/plugins/mod_component.lua @@ -6,95 +6,300 @@ -- COPYING file in the source package for more information. -- -if module:get_host_type() ~= "component" then - error("Don't load mod_component manually, it should be for a component, please see http://prosody.im/doc/components", 0); -end +module:set_global(); local t_concat = table.concat; +local logger = require "util.logger"; local sha1 = require "util.hashes".sha1; local st = require "util.stanza"; +local jid_split = require "util.jid".split; +local new_xmpp_stream = require "util.xmppstream".new; +local uuid_gen = require "util.uuid".generate; + + local log = module._log; -local main_session, send; +local sessions = module:shared("sessions"); -local function on_destroy(session, err) - if main_session == session then - connected = false; - main_session = nil; +function module.add_host(module) + if module:get_host_type() ~= "component" then + error("Don't load mod_component manually, it should be for a component, please see http://prosody.im/doc/components", 0); + end + + local env = module.environment; + env.connected = false; + + local send; + + local function on_destroy(session, err) + env.connected = false; send = nil; session.on_destroy = nil; end + + -- Handle authentication attempts by component + local function handle_component_auth(event) + local session, stanza = event.origin, event.stanza; + + if session.type ~= "component_unauthed" then return; end + + if (not session.host) or #stanza.tags > 0 then + (session.log or log)("warn", "Invalid component handshake for host: %s", session.host); + session:close("not-authorized"); + return true; + end + + local secret = module:get_option("component_secret"); + if not secret then + (session.log or log)("warn", "Component attempted to identify as %s, but component_secret is not set", session.host); + session:close("not-authorized"); + return true; + end + + local supplied_token = t_concat(stanza); + local calculated_token = sha1(session.streamid..secret, true); + if supplied_token:lower() ~= calculated_token:lower() then + module:log("info", "Component authentication failed for %s", session.host); + session:close{ condition = "not-authorized", text = "Given token does not match calculated token" }; + return true; + end + + if env.connected then + module:log("error", "Second component attempted to connect, denying connection"); + session:close{ condition = "conflict", text = "Component already connected" }; + return true; + end + + env.connected = true; + send = session.send; + session.on_destroy = on_destroy; + session.component_validate_from = module:get_option_boolean("validate_from_addresses", true); + session.type = "component"; + module:log("info", "External component successfully authenticated"); + session.send(st.stanza("handshake")); + + return true; + end + module:hook("stanza/jabber:component:accept:handshake", handle_component_auth); + + -- Handle stanzas addressed to this component + local function handle_stanza(event) + local stanza = event.stanza; + if send then + stanza.attr.xmlns = nil; + send(stanza); + else + module:log("warn", "Component not connected, bouncing error for: %s", stanza:top_tag()); + if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then + event.origin.send(st.error_reply(stanza, "wait", "service-unavailable", "Component unavailable")); + end + end + return true; + end + + module:hook("iq/bare", handle_stanza, -1); + module:hook("message/bare", handle_stanza, -1); + module:hook("presence/bare", handle_stanza, -1); + module:hook("iq/full", handle_stanza, -1); + module:hook("message/full", handle_stanza, -1); + module:hook("presence/full", handle_stanza, -1); + module:hook("iq/host", handle_stanza, -1); + module:hook("message/host", handle_stanza, -1); + module:hook("presence/host", handle_stanza, -1); end -local function handle_stanza(event) - local stanza = event.stanza; - if send then - stanza.attr.xmlns = nil; - send(stanza); - else - log("warn", "Component not connected, bouncing error for: %s", stanza:top_tag()); - if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then - event.origin.send(st.error_reply(stanza, "wait", "service-unavailable", "Component unavailable")); +--- Network and stream part --- + +local xmlns_component = 'jabber:component:accept'; + +local listener = {}; + +--- Callbacks/data for xmppstream to handle streams for us --- + +local stream_callbacks = { default_ns = xmlns_component }; + +local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams"; + +function stream_callbacks.error(session, error, data, data2) + if session.destroyed then return; end + module:log("warn", "Error processing component stream: "..tostring(error)); + if error == "no-stream" then + session:close("invalid-namespace"); + elseif error == "parse-error" then + session.log("warn", "External component %s XML parse error: %s", tostring(session.host), tostring(data)); + session:close("not-well-formed"); + elseif error == "stream-error" then + local condition, text = "undefined-condition"; + for child in data:children() do + if child.attr.xmlns == xmlns_xmpp_streams then + if child.name ~= "text" then + condition = child.name; + else + text = child:get_text(); + end + if condition ~= "undefined-condition" and text then + break; + end + end end + text = condition .. (text and (" ("..text..")") or ""); + session.log("info", "Session closed by remote with error: %s", text); + session:close(nil, text); end - return true; end -module:hook("iq/bare", handle_stanza, -1); -module:hook("message/bare", handle_stanza, -1); -module:hook("presence/bare", handle_stanza, -1); -module:hook("iq/full", handle_stanza, -1); -module:hook("message/full", handle_stanza, -1); -module:hook("presence/full", handle_stanza, -1); -module:hook("iq/host", handle_stanza, -1); -module:hook("message/host", handle_stanza, -1); -module:hook("presence/host", handle_stanza, -1); - ---- Handle authentication attempts by components -function handle_component_auth(event) - local session, stanza = event.origin, event.stanza; - - if session.type ~= "component" then return; end - if main_session == session then return; end +function stream_callbacks.streamopened(session, attr) + if not hosts[attr.to] or not hosts[attr.to].modules.component then + session:close{ condition = "host-unknown", text = tostring(attr.to).." does not match any configured external components" }; + return; + end + session.host = attr.to; + session.streamid = uuid_gen(); + session.notopen = nil; + -- Return stream header + session.send("<?xml version='1.0'?>"); + session.send(st.stanza("stream:stream", { xmlns=xmlns_component, + ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.host }):top_tag()); +end - if (not session.host) or #stanza.tags > 0 then - (session.log or log)("warn", "Invalid component handshake for host: %s", session.host); - session:close("not-authorized"); - return true; +function stream_callbacks.streamclosed(session) + session.log("debug", "Received </stream:stream>"); + session:close(); +end + +local core_process_stanza = core_process_stanza; + +function stream_callbacks.handlestanza(session, stanza) + -- Namespaces are icky. + if not stanza.attr.xmlns and stanza.name == "handshake" then + stanza.attr.xmlns = xmlns_component; end - - local secret = module:get_option("component_secret"); - if not secret then - (session.log or log)("warn", "Component attempted to identify as %s, but component_secret is not set", session.host); - session:close("not-authorized"); - return true; + if not stanza.attr.xmlns or stanza.attr.xmlns == "jabber:client" then + local from = stanza.attr.from; + if from then + if session.component_validate_from then + local _, domain = jid_split(stanza.attr.from); + if domain ~= session.host then + -- Return error + session.log("warn", "Component sent stanza with missing or invalid 'from' address"); + session:close{ + condition = "invalid-from"; + text = "Component tried to send from address <"..tostring(from) + .."> which is not in domain <"..tostring(session.host)..">"; + }; + return; + end + end + else + stanza.attr.from = session.host; -- COMPAT: Strictly we shouldn't allow this + end + if not stanza.attr.to then + session.log("warn", "Rejecting stanza with no 'to' address"); + session.send(st.error_reply(stanza, "modify", "bad-request", "Components MUST specify a 'to' address on stanzas")); + return; + end end - - local supplied_token = t_concat(stanza); - local calculated_token = sha1(session.streamid..secret, true); - if supplied_token:lower() ~= calculated_token:lower() then - log("info", "Component authentication failed for %s", session.host); - session:close{ condition = "not-authorized", text = "Given token does not match calculated token" }; - return true; + return core_process_stanza(session, stanza); +end + +--- Closing a component connection +local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'}; +local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" }; +local function session_close(session, reason) + if session.destroyed then return; end + if session.conn then + if session.notopen then + session.send("<?xml version='1.0'?>"); + session.send(st.stanza("stream:stream", default_stream_attr):top_tag()); + end + if reason then + if type(reason) == "string" then -- assume stream error + module:log("info", "Disconnecting component, <stream:error> is: %s", reason); + session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' })); + elseif type(reason) == "table" then + if reason.condition then + local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up(); + if reason.text then + stanza:tag("text", stream_xmlns_attr):text(reason.text):up(); + end + if reason.extra then + stanza:add_child(reason.extra); + end + module:log("info", "Disconnecting component, <stream:error> is: %s", tostring(stanza)); + session.send(stanza); + elseif reason.name then -- a stanza + module:log("info", "Disconnecting component, <stream:error> is: %s", tostring(reason)); + session.send(reason); + end + end + end + session.send("</stream:stream>"); + session.conn:close(); + listener.ondisconnect(session.conn, "stream error"); end +end + +--- Component connlistener + +function listener.onconnect(conn) + local _send = conn.write; + local session = { type = "component_unauthed", conn = conn, send = function (data) return _send(conn, tostring(data)); end }; + + -- Logging functions -- + local conn_name = "jcp"..tostring(conn):match("[a-f0-9]+$"); + session.log = logger.init(conn_name); + session.close = session_close; - -- If component not already created for this host, create one now - if not main_session then - connected = true; - send = session.send; - main_session = session; - session.on_destroy = on_destroy; - session.component_validate_from = module:get_option_boolean("validate_from_addresses", true); - log("info", "Component successfully authenticated: %s", session.host); - session.send(st.stanza("handshake")); - else -- TODO: Implement stanza distribution - log("error", "Multiple components bound to the same address, first one wins: %s", session.host); - session:close{ condition = "conflict", text = "Component already connected" }; + session.log("info", "Incoming Jabber component connection"); + + local stream = new_xmpp_stream(session, stream_callbacks); + session.stream = stream; + + session.notopen = true; + + function session.reset_stream() + session.notopen = true; + session.stream:reset(); + end + + function session.data(conn, data) + local ok, err = stream:feed(data); + if ok then return; end + module:log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_")); + session:close("not-well-formed"); end - return true; + session.dispatch_stanza = stream_callbacks.handlestanza; + + sessions[conn] = session; +end +function listener.onincoming(conn, data) + local session = sessions[conn]; + session.data(conn, data); +end +function listener.ondisconnect(conn, err) + local session = sessions[conn]; + if session then + (session.log or log)("info", "component disconnected: %s (%s)", tostring(session.host), tostring(err)); + if session.on_destroy then session:on_destroy(err); end + sessions[conn] = nil; + for k in pairs(session) do + if k ~= "log" and k ~= "close" then + session[k] = nil; + end + end + session.destroyed = true; + session = nil; + end end -module:hook("stanza/jabber:component:accept:handshake", handle_component_auth); +module:add_item("net-provider", { + name = "component"; + listener = listener; + default_port = 5347; + multiplex = { + pattern = "^<.*:stream.*%sxmlns%s*=%s*(['\"])jabber:component%1.*>"; + }; +}); |