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core/s2smanager.lua @ 434:0d7ba3742f7a
(Basic) IDNA and SRV fallback support
| author | Matthew Wild <mwild1@gmail.com> |
|---|---|
| date | Wed, 26 Nov 2008 23:44:30 +0000 |
| parent | 360:e918c979ad1a |
| child | 435:4087aa611de2 |
| rev | line source |
|---|---|
| 148 | 1 |
| 2 local hosts = hosts; | |
| 3 local sessions = sessions; | |
| 4 local socket = require "socket"; | |
| 5 local format = string.format; | |
| 337 | 6 local t_insert, t_sort = table.insert, table.sort; |
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7 local get_traceback = debug.traceback; |
| 148 | 8 local tostring, pairs, ipairs, getmetatable, print, newproxy, error, tonumber |
| 9 = tostring, pairs, ipairs, getmetatable, print, newproxy, error, tonumber; | |
| 10 | |
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11 local idna_to_ascii = require "util.encodings".idna.to_ascii; |
| 148 | 12 local connlisteners_get = require "net.connlisteners".get; |
| 13 local wraptlsclient = require "net.server".wraptlsclient; | |
| 14 local modulemanager = require "core.modulemanager"; | |
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15 local st = require "stanza"; |
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16 local stanza = st.stanza; |
| 148 | 17 |
| 18 local uuid_gen = require "util.uuid".generate; | |
| 19 | |
| 20 local logger_init = require "util.logger".init; | |
| 21 | |
| 22 local log = logger_init("s2smanager"); | |
| 23 | |
| 24 local md5_hash = require "util.hashes".md5; | |
| 25 | |
| 26 local dialback_secret = "This is very secret!!! Ha!"; | |
| 27 | |
| 337 | 28 local dns = require "net.dns"; |
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29 |
| 148 | 30 module "s2smanager" |
| 31 | |
| 337 | 32 local function compare_srv_priorities(a,b) return a.priority < b.priority or a.weight < b.weight; end |
| 33 | |
| 148 | 34 function send_to_host(from_host, to_host, data) |
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35 if data.name then data = tostring(data); end |
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36 local host = hosts[from_host].s2sout[to_host]; |
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37 if host then |
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38 -- We have a connection to this host already |
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39 if host.type == "s2sout_unauthed" and ((not data.xmlns) or data.xmlns == "jabber:client" or data.xmlns == "jabber:server") then |
| 337 | 40 (host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host..", authing it now..."); |
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41 if not host.notopen and not host.dialback_key then |
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42 host.log("debug", "dialback had not been initiated"); |
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43 initiate_dialback(host); |
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44 end |
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45 |
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46 -- Queue stanza until we are able to send it |
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47 if host.sendq then t_insert(host.sendq, data); |
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48 else host.sendq = { data }; end |
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49 elseif host.type == "local" or host.type == "component" then |
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50 log("error", "Trying to send a stanza to ourselves??") |
| 256 | 51 log("error", "Traceback: %s", get_traceback()); |
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52 log("error", "Stanza: %s", tostring(data)); |
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53 else |
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54 (host.log or log)("debug", "going to send stanza to "..to_host.." from "..from_host); |
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55 -- FIXME |
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56 if host.from_host ~= from_host then |
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57 log("error", "WARNING! This might, possibly, be a bug, but it might not..."); |
| 331 | 58 log("error", "We are going to send from %s instead of %s", tostring(host.from_host), tostring(from_host)); |
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59 end |
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60 host.sends2s(data); |
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61 host.log("debug", "stanza sent over "..host.type); |
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62 end |
| 148 | 63 else |
| 64 log("debug", "opening a new outgoing connection for this stanza"); | |
| 65 local host_session = new_outgoing(from_host, to_host); | |
| 66 -- Store in buffer | |
| 67 host_session.sendq = { data }; | |
| 68 end | |
| 69 end | |
| 70 | |
| 71 local open_sessions = 0; | |
| 72 | |
| 73 function new_incoming(conn) | |
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74 local session = { conn = conn, type = "s2sin_unauthed", direction = "incoming" }; |
| 148 | 75 if true then |
| 76 session.trace = newproxy(true); | |
| 77 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; print("s2s session got collected, now "..open_sessions.." s2s sessions are allocated") end; | |
| 78 end | |
| 79 open_sessions = open_sessions + 1; | |
| 343 | 80 local w, log = conn.write, logger_init("s2sin"..tostring(conn):match("[a-f0-9]+$")); |
| 81 session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end | |
| 148 | 82 return session; |
| 83 end | |
| 84 | |
| 85 function new_outgoing(from_host, to_host) | |
| 86 local host_session = { to_host = to_host, from_host = from_host, notopen = true, type = "s2sout_unauthed", direction = "outgoing" }; | |
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87 hosts[from_host].s2sout[to_host] = host_session; |
| 148 | 88 |
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89 local log; |
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90 do |
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91 local conn_name = "s2sout"..tostring(conn):match("[a-f0-9]*$"); |
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92 log = logger_init(conn_name); |
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93 host_session.log = log; |
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94 end |
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95 |
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96 attempt_connection(host_session); |
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97 |
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98 return host_session; |
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99 end |
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100 |
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101 |
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102 function attempt_connection(host_session, err) |
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103 local from_host, to_host = host_session.from_host, host_session.to_host; |
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104 local conn, handler = socket.tcp() |
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105 |
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106 local connect_host, connect_port = idna_to_ascii(to_host), 5269; |
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107 |
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108 if not err then -- This is our first attempt |
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109 local answer = dns.lookup("_xmpp-server._tcp."..connect_host..".", "SRV"); |
| 337 | 110 |
| 111 if answer then | |
| 112 log("debug", to_host.." has SRV records, handling..."); | |
| 113 local srv_hosts = {}; | |
| 114 host_session.srv_hosts = srv_hosts; | |
| 115 for _, record in ipairs(answer) do | |
| 116 t_insert(srv_hosts, record.srv); | |
| 117 end | |
| 118 t_sort(srv_hosts, compare_srv_priorities); | |
| 119 | |
| 120 local srv_choice = srv_hosts[1]; | |
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121 host_session.srv_choice = 1; |
| 337 | 122 if srv_choice then |
| 123 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; | |
| 124 log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port); | |
| 125 end | |
| 126 end | |
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127 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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128 host_session.srv_choice = host_session.srv_choice + 1; |
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129 local srv_choice = host_session.srv_hosts[host_session.srv_choice]; |
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130 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; |
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131 host_session.log("debug", "Attempt #%d: This time to %s:%d", host_session.srv_choice, connect_host, connect_port); |
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132 else |
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133 host_session.log("debug", "Out of connection options, can't connect to %s", tostring(host_session.to_host)); |
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134 -- We're out of options |
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135 return false; |
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136 end |
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137 |
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138 -- Ok, we're going to try to connect |
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139 conn:settimeout(0); |
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140 local success, err = conn:connect(connect_host, connect_port); |
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141 if not success and err ~= "timeout" then |
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142 log("warn", "s2s connect() failed: %s", err); |
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143 end |
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144 |
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145 local cl = connlisteners_get("xmppserver"); |
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146 conn = wraptlsclient(cl, conn, connect_host, connect_port, 0, 1, hosts[from_host].ssl_ctx ); |
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147 host_session.conn = conn; |
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148 |
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149 -- Register this outgoing connection so that xmppserver_listener knows about it |
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150 -- otherwise it will assume it is a new incoming connection |
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151 cl.register_outgoing(conn, host_session); |
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152 |
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153 local w = conn.write; |
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154 host_session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end |
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155 |
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156 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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157 return true; |
| 148 | 158 end |
| 159 | |
| 160 function streamopened(session, attr) | |
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161 local send = session.sends2s; |
| 148 | 162 |
| 163 session.version = tonumber(attr.version) or 0; | |
| 164 if session.version >= 1.0 and not (attr.to and attr.from) then | |
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165 --print("to: "..tostring(attr.to).." from: "..tostring(attr.from)); |
| 148 | 166 log("warn", (session.to_host or "(unknown)").." failed to specify 'to' or 'from' hostname as per RFC"); |
| 167 end | |
| 168 | |
| 169 if session.direction == "incoming" then | |
| 170 -- Send a reply stream header | |
| 171 | |
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172 --for k,v in pairs(attr) do print("", tostring(k), ":::", tostring(v)); end |
| 148 | 173 |
| 174 session.to_host = attr.to; | |
| 175 session.from_host = attr.from; | |
| 176 | |
| 177 session.streamid = uuid_gen(); | |
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178 (session.log or log)("debug", "incoming s2s received <stream:stream>"); |
| 148 | 179 send("<?xml version='1.0'?>"); |
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180 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 | 181 if session.to_host and not hosts[session.to_host] then |
| 182 -- Attempting to connect to a host we don't serve | |
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183 session:close({ condition = "host-unknown"; text = "This host does not serve "..session.to_host }); |
| 331 | 184 return; |
| 185 end | |
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186 if session.version >= 1.0 then |
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187 send(st.stanza("stream:features") |
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188 :tag("dialback", { xmlns='urn:xmpp:features:dialback' }):tag("optional"):up():up()); |
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189 end |
| 148 | 190 elseif session.direction == "outgoing" then |
| 191 -- If we are just using the connection for verifying dialback keys, we won't try and auth it | |
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192 if not attr.id then error("stream response did not give us a streamid!!!"); end |
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193 session.streamid = attr.id; |
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194 |
| 148 | 195 if not session.dialback_verifying then |
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196 initiate_dialback(session); |
| 148 | 197 else |
| 198 mark_connected(session); | |
| 199 end | |
| 200 end | |
| 259 | 201 |
| 148 | 202 session.notopen = nil; |
| 203 end | |
| 204 | |
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205 function initiate_dialback(session) |
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206 -- generate dialback key |
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207 session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host); |
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208 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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209 session.log("info", "sent dialback key on outgoing s2s stream"); |
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210 end |
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211 |
| 148 | 212 function generate_dialback(id, to, from) |
| 213 return md5_hash(id..to..from..dialback_secret); -- FIXME: See XEP-185 and XEP-220 | |
| 214 end | |
| 215 | |
| 216 function verify_dialback(id, to, from, key) | |
| 217 return key == generate_dialback(id, to, from); | |
| 218 end | |
| 219 | |
| 220 function make_authenticated(session) | |
| 221 if session.type == "s2sout_unauthed" then | |
| 222 session.type = "s2sout"; | |
| 223 elseif session.type == "s2sin_unauthed" then | |
| 224 session.type = "s2sin"; | |
| 225 else | |
| 226 return false; | |
| 227 end | |
| 228 session.log("info", "connection is now authenticated"); | |
| 229 | |
| 230 mark_connected(session); | |
| 231 | |
| 232 return true; | |
| 233 end | |
| 234 | |
| 235 function mark_connected(session) | |
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236 local sendq, send = session.sendq, session.sends2s; |
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237 |
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238 local from, to = session.from_host, session.to_host; |
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239 |
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240 session.log("debug", session.direction.." s2s connection "..from.."->"..to.." is now complete"); |
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241 |
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242 local send_to_host = send_to_host; |
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243 function session.send(data) send_to_host(to, from, data); end |
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244 |
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245 |
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246 if session.direction == "outgoing" then |
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247 if sendq then |
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248 session.log("debug", "sending "..#sendq.." queued stanzas across new outgoing connection to "..session.to_host); |
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249 for i, data in ipairs(sendq) do |
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250 send(data); |
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251 sendq[i] = nil; |
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252 end |
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253 session.sendq = nil; |
| 148 | 254 end |
| 255 end | |
| 256 end | |
| 257 | |
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258 function destroy_session(session) |
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259 (session.log or log)("info", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host)); |
| 331 | 260 |
| 261 -- FIXME: Flush sendq here/report errors to originators | |
| 262 | |
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263 if session.direction == "outgoing" then |
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264 hosts[session.from_host].s2sout[session.to_host] = nil; |
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265 end |
| 331 | 266 |
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267 for k in pairs(session) do |
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268 if k ~= "trace" then |
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269 session[k] = nil; |
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270 end |
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271 end |
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272 end |
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273 |
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274 return _M; |
