Wed, 18 Feb 2009 19:34:26 +0000
Automated merge with http://waqas.ath.cx:8000/
759 | 1 | -- Prosody IM v0.3 |
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2 | -- Copyright (C) 2008-2009 Matthew Wild |
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3 | -- Copyright (C) 2008-2009 Waqas Hussain |
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4 | -- |
758 | 5 | -- This project is MIT/X11 licensed. Please see the |
6 | -- COPYING file in the source package for more information. | |
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7 | -- |
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8 | |
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9 | |
148 | 10 | |
11 | local hosts = hosts; | |
12 | local sessions = sessions; | |
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13 | local core_process_stanza = function(a, b) core_process_stanza(a, b); end |
148 | 14 | local socket = require "socket"; |
15 | local format = string.format; | |
337 | 16 | local t_insert, t_sort = table.insert, table.sort; |
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17 | local get_traceback = debug.traceback; |
148 | 18 | local tostring, pairs, ipairs, getmetatable, print, newproxy, error, tonumber |
19 | = tostring, pairs, ipairs, getmetatable, print, newproxy, error, tonumber; | |
20 | ||
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21 | local idna_to_ascii = require "util.encodings".idna.to_ascii; |
148 | 22 | local connlisteners_get = require "net.connlisteners".get; |
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23 | local wrapclient = require "net.server".wrapclient; |
148 | 24 | local modulemanager = require "core.modulemanager"; |
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25 | local st = require "stanza"; |
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26 | local stanza = st.stanza; |
148 | 27 | |
28 | local uuid_gen = require "util.uuid".generate; | |
29 | ||
30 | local logger_init = require "util.logger".init; | |
31 | ||
32 | local log = logger_init("s2smanager"); | |
33 | ||
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34 | local sha256_hash = require "util.hashes".sha256; |
148 | 35 | |
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36 | local dialback_secret = sha256_hash(tostring{} .. math.random() .. socket.gettime(), true); |
148 | 37 | |
337 | 38 | local dns = require "net.dns"; |
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39 | |
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40 | incoming_s2s = {}; |
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41 | local incoming_s2s = incoming_s2s; |
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42 | |
148 | 43 | module "s2smanager" |
44 | ||
337 | 45 | local function compare_srv_priorities(a,b) return a.priority < b.priority or a.weight < b.weight; end |
46 | ||
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47 | local function bounce_sendq(session) |
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48 | local sendq = session.sendq; |
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49 | if sendq then |
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50 | session.log("debug", "sending error replies for "..#sendq.." queued stanzas because of failed outgoing connection to "..tostring(session.to_host)); |
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51 | local dummy = { |
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52 | type = "s2sin"; |
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53 | send = function(s) |
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54 | (session.log or log)("error", "Replying to to an s2s error reply, please report this! Traceback: %s", get_traceback()); |
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55 | end; |
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56 | dummy = true; |
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57 | }; |
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58 | for i, data in ipairs(sendq) do |
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59 | local reply = data[2]; |
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60 | local xmlns = reply.attr.xmlns; |
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61 | if not xmlns or xmlns == "jabber:client" or xmlns == "jabber:server" then |
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62 | reply.attr.type = "error"; |
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63 | reply:tag("error", {type = "cancel"}) |
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64 | :tag("remote-server-not-found", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up(); |
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65 | core_process_stanza(dummy, reply); |
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66 | end |
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67 | sendq[i] = nil; |
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68 | end |
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69 | session.sendq = nil; |
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70 | end |
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71 | end |
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72 | |
148 | 73 | function send_to_host(from_host, to_host, data) |
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74 | local host = hosts[from_host].s2sout[to_host]; |
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75 | if host then |
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76 | -- We have a connection to this host already |
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77 | if host.type == "s2sout_unauthed" and data.name ~= "db:verify" and ((not data.xmlns) or data.xmlns == "jabber:client" or data.xmlns == "jabber:server") then |
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78 | (host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host); |
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79 | if not host.notopen and not host.dialback_key then |
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80 | host.log("debug", "dialback had not been initiated"); |
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81 | initiate_dialback(host); |
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82 | end |
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83 | |
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84 | -- Queue stanza until we are able to send it |
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85 | if host.sendq then t_insert(host.sendq, {tostring(data), st.reply(data)}); |
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86 | else host.sendq = { {tostring(data), st.reply(data)} }; end |
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87 | host.log("debug", "stanza [%s] queued ", data.name); |
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88 | elseif host.type == "local" or host.type == "component" then |
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89 | log("error", "Trying to send a stanza to ourselves??") |
256 | 90 | log("error", "Traceback: %s", get_traceback()); |
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91 | log("error", "Stanza: %s", tostring(data)); |
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92 | else |
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93 | (host.log or log)("debug", "going to send stanza to "..to_host.." from "..from_host); |
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94 | -- FIXME |
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95 | if host.from_host ~= from_host then |
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96 | log("error", "WARNING! This might, possibly, be a bug, but it might not..."); |
331 | 97 | log("error", "We are going to send from %s instead of %s", tostring(host.from_host), tostring(from_host)); |
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98 | end |
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99 | host.sends2s(data); |
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100 | host.log("debug", "stanza sent over "..host.type); |
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101 | end |
148 | 102 | else |
103 | log("debug", "opening a new outgoing connection for this stanza"); | |
104 | local host_session = new_outgoing(from_host, to_host); | |
105 | -- Store in buffer | |
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106 | host_session.sendq = { {tostring(data), st.reply(data)} }; |
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107 | if not host_session.conn then destroy_session(host_session); end |
148 | 108 | end |
109 | end | |
110 | ||
111 | local open_sessions = 0; | |
112 | ||
113 | function new_incoming(conn) | |
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114 | local session = { conn = conn, type = "s2sin_unauthed", direction = "incoming", hosts = {} }; |
148 | 115 | if true then |
116 | session.trace = newproxy(true); | |
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117 | getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; end; |
148 | 118 | end |
119 | open_sessions = open_sessions + 1; | |
343 | 120 | local w, log = conn.write, logger_init("s2sin"..tostring(conn):match("[a-f0-9]+$")); |
121 | session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end | |
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122 | incoming_s2s[session] = true; |
148 | 123 | return session; |
124 | end | |
125 | ||
126 | function new_outgoing(from_host, to_host) | |
127 | local host_session = { to_host = to_host, from_host = from_host, notopen = true, type = "s2sout_unauthed", direction = "outgoing" }; | |
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128 | hosts[from_host].s2sout[to_host] = host_session; |
148 | 129 | |
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130 | local log; |
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131 | do |
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132 | local conn_name = "s2sout"..tostring(host_session):match("[a-f0-9]*$"); |
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133 | log = logger_init(conn_name); |
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134 | host_session.log = log; |
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135 | end |
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136 | |
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137 | attempt_connection(host_session); |
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138 | |
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139 | return host_session; |
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140 | end |
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141 | |
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142 | |
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143 | function attempt_connection(host_session, err) |
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144 | local from_host, to_host = host_session.from_host, host_session.to_host; |
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145 | local conn, handler = socket.tcp() |
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146 | |
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147 | local connect_host, connect_port = idna_to_ascii(to_host), 5269; |
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148 | |
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149 | if not err then -- This is our first attempt |
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150 | local answer = dns.lookup("_xmpp-server._tcp."..connect_host..".", "SRV"); |
337 | 151 | |
152 | if answer then | |
153 | log("debug", to_host.." has SRV records, handling..."); | |
154 | local srv_hosts = {}; | |
155 | host_session.srv_hosts = srv_hosts; | |
156 | for _, record in ipairs(answer) do | |
157 | t_insert(srv_hosts, record.srv); | |
158 | end | |
159 | t_sort(srv_hosts, compare_srv_priorities); | |
160 | ||
161 | local srv_choice = srv_hosts[1]; | |
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162 | host_session.srv_choice = 1; |
337 | 163 | if srv_choice then |
164 | connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; | |
165 | log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port); | |
166 | end | |
167 | end | |
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168 | elseif host_session.srv_hosts and #host_session.srv_hosts > host_session.srv_choice then -- Not our first attempt, and we also have SRV |
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169 | host_session.srv_choice = host_session.srv_choice + 1; |
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170 | local srv_choice = host_session.srv_hosts[host_session.srv_choice]; |
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171 | connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; |
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172 | host_session.log("debug", "Connection failed (%s). Attempt #%d: This time to %s:%d", tostring(err), host_session.srv_choice, connect_host, connect_port); |
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173 | else |
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174 | host_session.log("debug", "Out of connection options, can't connect to %s", tostring(host_session.to_host)); |
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175 | -- We're out of options |
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176 | return false; |
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177 | end |
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178 | |
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179 | -- Ok, we're going to try to connect |
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180 | conn:settimeout(0); |
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181 | local success, err = conn:connect(connect_host, connect_port); |
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182 | if not success and err ~= "timeout" then |
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183 | log("warn", "s2s connect() failed: %s", err); |
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184 | return false; |
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185 | end |
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186 | |
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187 | local cl = connlisteners_get("xmppserver"); |
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188 | conn = wrapclient(conn, connect_host, connect_port, cl, cl.default_mode or 1, hosts[from_host].ssl_ctx, false ); |
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189 | host_session.conn = conn; |
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190 | |
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191 | -- Register this outgoing connection so that xmppserver_listener knows about it |
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192 | -- otherwise it will assume it is a new incoming connection |
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193 | cl.register_outgoing(conn, host_session); |
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194 | |
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195 | local w = conn.write; |
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196 | host_session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end |
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197 | |
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198 | conn.write(format([[<stream:stream xmlns='jabber:server' xmlns:db='jabber:server:dialback' xmlns:stream='http://etherx.jabber.org/streams' from='%s' to='%s' version='1.0'>]], from_host, to_host)); |
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199 | return true; |
148 | 200 | end |
201 | ||
202 | function streamopened(session, attr) | |
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203 | local send = session.sends2s; |
148 | 204 | |
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205 | -- TODO: #29: SASL/TLS on s2s streams |
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206 | session.version = 0; --tonumber(attr.version) or 0; |
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207 | |
148 | 208 | if session.version >= 1.0 and not (attr.to and attr.from) then |
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209 | --print("to: "..tostring(attr.to).." from: "..tostring(attr.from)); |
148 | 210 | log("warn", (session.to_host or "(unknown)").." failed to specify 'to' or 'from' hostname as per RFC"); |
211 | end | |
212 | ||
213 | if session.direction == "incoming" then | |
214 | -- Send a reply stream header | |
215 | ||
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216 | --for k,v in pairs(attr) do print("", tostring(k), ":::", tostring(v)); end |
148 | 217 | |
218 | session.to_host = attr.to; | |
219 | session.from_host = attr.from; | |
220 | ||
221 | session.streamid = uuid_gen(); | |
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222 | (session.log or log)("debug", "incoming s2s received <stream:stream>"); |
148 | 223 | send("<?xml version='1.0'?>"); |
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224 | send(stanza("stream:stream", { xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback', ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.to_host }):top_tag()); |
331 | 225 | if session.to_host and not hosts[session.to_host] then |
226 | -- Attempting to connect to a host we don't serve | |
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227 | session:close({ condition = "host-unknown"; text = "This host does not serve "..session.to_host }); |
331 | 228 | return; |
229 | end | |
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230 | if session.version >= 1.0 then |
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231 | send(st.stanza("stream:features") |
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232 | :tag("dialback", { xmlns='urn:xmpp:features:dialback' }):tag("optional"):up():up()); |
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233 | end |
148 | 234 | elseif session.direction == "outgoing" then |
235 | -- If we are just using the connection for verifying dialback keys, we won't try and auth it | |
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236 | if not attr.id then error("stream response did not give us a streamid!!!"); end |
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237 | session.streamid = attr.id; |
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238 | |
148 | 239 | if not session.dialback_verifying then |
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240 | initiate_dialback(session); |
148 | 241 | else |
242 | mark_connected(session); | |
243 | end | |
244 | end | |
259 | 245 | |
148 | 246 | session.notopen = nil; |
247 | end | |
248 | ||
190
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249 | function initiate_dialback(session) |
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250 | -- generate dialback key |
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251 | session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host); |
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252 | session.sends2s(format("<db:result from='%s' to='%s'>%s</db:result>", session.from_host, session.to_host, session.dialback_key)); |
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253 | session.log("info", "sent dialback key on outgoing s2s stream"); |
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254 | end |
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255 | |
148 | 256 | function generate_dialback(id, to, from) |
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257 | return sha256_hash(id..to..from..dialback_secret, true); |
148 | 258 | end |
259 | ||
260 | function verify_dialback(id, to, from, key) | |
261 | return key == generate_dialback(id, to, from); | |
262 | end | |
263 | ||
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264 | function make_authenticated(session, host) |
148 | 265 | if session.type == "s2sout_unauthed" then |
266 | session.type = "s2sout"; | |
267 | elseif session.type == "s2sin_unauthed" then | |
268 | session.type = "s2sin"; | |
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269 | if host then |
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270 | session.hosts[host].authed = true; |
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271 | end |
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272 | elseif session.type == "s2sin" and host then |
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273 | session.hosts[host].authed = true; |
148 | 274 | else |
275 | return false; | |
276 | end | |
277 | session.log("info", "connection is now authenticated"); | |
278 | ||
279 | mark_connected(session); | |
280 | ||
281 | return true; | |
282 | end | |
283 | ||
284 | function mark_connected(session) | |
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285 | local sendq, send = session.sendq, session.sends2s; |
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286 | |
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287 | local from, to = session.from_host, session.to_host; |
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288 | |
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289 | session.log("debug", session.direction.." s2s connection "..from.."->"..to.." is now complete"); |
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290 | |
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291 | local send_to_host = send_to_host; |
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292 | function session.send(data) send_to_host(to, from, data); end |
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293 | |
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294 | |
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295 | if session.direction == "outgoing" then |
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296 | if sendq then |
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297 | session.log("debug", "sending "..#sendq.." queued stanzas across new outgoing connection to "..session.to_host); |
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298 | for i, data in ipairs(sendq) do |
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299 | send(data[1]); |
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300 | sendq[i] = nil; |
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301 | end |
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302 | session.sendq = nil; |
148 | 303 | end |
304 | end | |
305 | end | |
306 | ||
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307 | function destroy_session(session) |
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Matthew Wild <mwild1@gmail.com>
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308 | (session.log or log)("info", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host)); |
331 | 309 | |
310 | ||
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311 | if session.direction == "outgoing" then |
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182f0c895676
Now outgoing s2s sessions are associated with their from_host, fixes #15
Matthew Wild <mwild1@gmail.com>
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312 | hosts[session.from_host].s2sout[session.to_host] = nil; |
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6957fe7b0313
Bounce stanza errors on failed s2s
Waqas Hussain <waqas20@gmail.com>
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313 | bounce_sendq(session); |
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cd2cab5400fc
Add support for dialback piggy-backing. Fixes #37. Thanks to CShadowRun for helping me test :)
Matthew Wild <mwild1@gmail.com>
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314 | elseif session.direction == "incoming" then |
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Add support for dialback piggy-backing. Fixes #37. Thanks to CShadowRun for helping me test :)
Matthew Wild <mwild1@gmail.com>
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315 | incoming_s2s[session] = nil; |
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316 | end |
331 | 317 | |
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318 | for k in pairs(session) do |
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319 | if k ~= "trace" then |
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320 | session[k] = nil; |
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321 | end |
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322 | end |
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323 | end |
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324 | |
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bbbd169b326b
Just committing this warning, because I want to know if the problem really affects us
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325 | return _M; |