Software / code / prosody
Annotate
core/s2smanager.lua @ 1199:db2a55fe94f2
s2smanager: Only send reply </stream:stream> when connection is still open
| author | Matthew Wild <mwild1@gmail.com> |
|---|---|
| date | Tue, 26 May 2009 01:07:52 +0100 |
| parent | 1075:831c84cbf5fa |
| child | 1204:dea89234e545 |
| rev | line source |
|---|---|
| 896 | 1 -- Prosody IM v0.4 |
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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; |
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18 local tostring, pairs, ipairs, getmetatable, newproxy, error, tonumber |
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19 = tostring, pairs, ipairs, getmetatable, newproxy, error, tonumber; |
| 148 | 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; |
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27 local nameprep = require "util.encodings".stringprep.nameprep; |
| 148 | 28 |
| 29 local uuid_gen = require "util.uuid".generate; | |
| 30 | |
| 31 local logger_init = require "util.logger".init; | |
| 32 | |
| 33 local log = logger_init("s2smanager"); | |
| 34 | |
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35 local sha256_hash = require "util.hashes".sha256; |
| 148 | 36 |
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37 local dialback_secret = sha256_hash(tostring{} .. math.random() .. socket.gettime(), true); |
| 148 | 38 |
| 974 | 39 local adns = require "net.adns"; |
| 40 | |
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41 incoming_s2s = {}; |
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42 local incoming_s2s = incoming_s2s; |
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43 |
| 148 | 44 module "s2smanager" |
| 45 | |
| 337 | 46 local function compare_srv_priorities(a,b) return a.priority < b.priority or a.weight < b.weight; end |
| 47 | |
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48 local function bounce_sendq(session) |
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49 local sendq = session.sendq; |
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50 if sendq then |
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51 session.log("info", "sending error replies for "..#sendq.." queued stanzas because of failed outgoing connection to "..tostring(session.to_host)); |
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52 local dummy = { |
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53 type = "s2sin"; |
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54 send = function(s) |
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55 (session.log or log)("error", "Replying to to an s2s error reply, please report this! Traceback: %s", get_traceback()); |
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56 end; |
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57 dummy = true; |
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58 }; |
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59 for i, data in ipairs(sendq) do |
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60 local reply = data[2]; |
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61 local xmlns = reply.attr.xmlns; |
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62 if not xmlns or xmlns == "jabber:client" or xmlns == "jabber:server" then |
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63 reply.attr.type = "error"; |
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64 reply:tag("error", {type = "cancel"}) |
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65 :tag("remote-server-not-found", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up(); |
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66 core_process_stanza(dummy, reply); |
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67 end |
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68 sendq[i] = nil; |
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69 end |
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70 session.sendq = nil; |
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71 end |
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72 end |
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73 |
| 148 | 74 function send_to_host(from_host, to_host, data) |
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75 local host = hosts[from_host].s2sout[to_host]; |
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76 if host then |
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77 -- We have a connection to this host already |
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78 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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79 (host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host); |
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80 if not host.notopen and not host.dialback_key and host.sends2s then |
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81 host.log("debug", "dialback had not been initiated"); |
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82 initiate_dialback(host); |
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83 end |
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84 |
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85 -- Queue stanza until we are able to send it |
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86 if host.sendq then t_insert(host.sendq, {tostring(data), st.reply(data)}); |
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87 else host.sendq = { {tostring(data), st.reply(data)} }; end |
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88 host.log("debug", "stanza [%s] queued ", data.name); |
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89 elseif host.type == "local" or host.type == "component" then |
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90 log("error", "Trying to send a stanza to ourselves??") |
| 256 | 91 log("error", "Traceback: %s", get_traceback()); |
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92 log("error", "Stanza: %s", tostring(data)); |
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93 else |
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94 (host.log or log)("debug", "going to send stanza to "..to_host.." from "..from_host); |
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95 -- FIXME |
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96 if host.from_host ~= from_host then |
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97 log("error", "WARNING! This might, possibly, be a bug, but it might not..."); |
| 331 | 98 log("error", "We are going to send from %s instead of %s", tostring(host.from_host), tostring(from_host)); |
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99 end |
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100 host.sends2s(data); |
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101 host.log("debug", "stanza sent over "..host.type); |
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102 end |
| 148 | 103 else |
| 104 log("debug", "opening a new outgoing connection for this stanza"); | |
| 105 local host_session = new_outgoing(from_host, to_host); | |
| 106 -- Store in buffer | |
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107 host_session.sendq = { {tostring(data), st.reply(data)} }; |
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108 log("debug", "stanza [%s] queued until connection complete", tostring(data.name)); |
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109 if (not host_session.connecting) and (not host_session.conn) then |
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110 log("warn", "Connection to %s failed already, destroying session...", to_host); |
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111 destroy_session(host_session); |
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112 end |
| 148 | 113 end |
| 114 end | |
| 115 | |
| 116 local open_sessions = 0; | |
| 117 | |
| 118 function new_incoming(conn) | |
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119 local session = { conn = conn, type = "s2sin_unauthed", direction = "incoming", hosts = {} }; |
| 148 | 120 if true then |
| 121 session.trace = newproxy(true); | |
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122 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; end; |
| 148 | 123 end |
| 124 open_sessions = open_sessions + 1; | |
| 343 | 125 local w, log = conn.write, logger_init("s2sin"..tostring(conn):match("[a-f0-9]+$")); |
| 126 session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end | |
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127 incoming_s2s[session] = true; |
| 148 | 128 return session; |
| 129 end | |
| 130 | |
| 131 function new_outgoing(from_host, to_host) | |
| 132 local host_session = { to_host = to_host, from_host = from_host, notopen = true, type = "s2sout_unauthed", direction = "outgoing" }; | |
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133 hosts[from_host].s2sout[to_host] = host_session; |
| 148 | 134 |
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135 local log; |
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136 do |
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137 local conn_name = "s2sout"..tostring(host_session):match("[a-f0-9]*$"); |
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138 log = logger_init(conn_name); |
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139 host_session.log = log; |
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140 end |
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141 |
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142 attempt_connection(host_session); |
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143 |
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144 if not host_session.sends2s then |
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145 -- A sends2s which buffers data (until the stream is opened) |
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146 -- note that data in this buffer will be sent before the stream is authed |
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147 -- and will not be ack'd in any way, successful or otherwise |
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148 local buffer; |
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149 function host_session.sends2s(data) |
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150 if not buffer then |
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151 buffer = {}; |
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152 host_session.send_buffer = buffer; |
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153 end |
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154 log("debug", "Buffering data on unconnected s2sout to %s", to_host); |
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155 buffer[#buffer+1] = data; |
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156 log("debug", "Buffered item %d: %s", #buffer, tostring(data)); |
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157 end |
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158 |
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159 end |
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160 |
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161 return host_session; |
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162 end |
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163 |
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164 |
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165 function attempt_connection(host_session, err) |
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166 local from_host, to_host = host_session.from_host, host_session.to_host; |
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167 local connect_host, connect_port = idna_to_ascii(to_host), 5269; |
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168 |
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169 if not err then -- This is our first attempt |
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170 log("debug", "First attempt to connect to %s, starting with SRV lookup...", to_host); |
| 974 | 171 host_session.connecting = true; |
| 172 local answer = | |
| 173 adns.lookup(function (answer) | |
| 174 host_session.connecting = nil; | |
| 175 if answer then | |
| 176 log("debug", to_host.." has SRV records, handling..."); | |
| 177 local srv_hosts = {}; | |
| 178 host_session.srv_hosts = srv_hosts; | |
| 179 for _, record in ipairs(answer) do | |
| 180 t_insert(srv_hosts, record.srv); | |
| 181 end | |
| 182 t_sort(srv_hosts, compare_srv_priorities); | |
| 183 | |
| 184 local srv_choice = srv_hosts[1]; | |
| 185 host_session.srv_choice = 1; | |
| 186 if srv_choice then | |
| 187 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; | |
| 188 log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port); | |
| 189 end | |
| 190 else | |
| 191 log("debug", to_host.." has no SRV records, falling back to A"); | |
| 337 | 192 end |
| 974 | 193 -- Try with SRV, or just the plain hostname if no SRV |
| 194 return try_connect(host_session, connect_host, connect_port); | |
| 195 end, "_xmpp-server._tcp."..connect_host..".", "SRV"); | |
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196 log("debug", "DNS lookup for %s sent, waiting for response before we can connect", to_host); |
| 974 | 197 return true; -- Attempt in progress |
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198 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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199 host_session.srv_choice = host_session.srv_choice + 1; |
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200 local srv_choice = host_session.srv_hosts[host_session.srv_choice]; |
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201 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; |
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202 host_session.log("info", "Connection failed (%s). Attempt #%d: This time to %s:%d", tostring(err), host_session.srv_choice, connect_host, connect_port); |
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203 else |
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204 host_session.log("info", "Out of connection options, can't connect to %s", tostring(host_session.to_host)); |
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205 -- We're out of options |
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206 return false; |
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207 end |
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208 |
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209 if not (connect_host and connect_port) then |
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210 -- Likely we couldn't resolve DNS |
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211 log("warn", "Hmm, we're without a host (%s) and port (%s) to connect to for %s, giving up :(", tostring(connect_host), tostring(connect_port), tostring(to_host)); |
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212 return false; |
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213 end |
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214 |
| 974 | 215 return try_connect(host_session, connect_host, connect_port); |
| 216 end | |
| 217 | |
| 218 function try_connect(host_session, connect_host, connect_port) | |
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219 host_session.log("info", "Beginning new connection attempt to %s (%s:%d)", host_session.to_host, connect_host, connect_port); |
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220 -- Ok, we're going to try to connect |
| 974 | 221 |
| 222 local from_host, to_host = host_session.from_host, host_session.to_host; | |
| 223 | |
| 224 local conn, handler = socket.tcp() | |
| 225 | |
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226 conn:settimeout(0); |
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227 local success, err = conn:connect(connect_host, connect_port); |
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228 if not success and err ~= "timeout" then |
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229 log("warn", "s2s connect() failed: %s", err); |
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230 return false; |
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231 end |
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232 |
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233 local cl = connlisteners_get("xmppserver"); |
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234 conn = wrapclient(conn, connect_host, connect_port, cl, cl.default_mode or 1, hosts[from_host].ssl_ctx, false ); |
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235 host_session.conn = conn; |
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236 |
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237 -- Register this outgoing connection so that xmppserver_listener knows about it |
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238 -- otherwise it will assume it is a new incoming connection |
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239 cl.register_outgoing(conn, host_session); |
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240 |
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241 local w = conn.write; |
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242 host_session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end |
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243 |
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244 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)); |
| 974 | 245 log("debug", "Connection attempt in progress..."); |
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246 return true; |
| 148 | 247 end |
| 248 | |
| 249 function streamopened(session, attr) | |
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250 local send = session.sends2s; |
| 148 | 251 |
|
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252 -- TODO: #29: SASL/TLS on s2s streams |
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253 session.version = 0; --tonumber(attr.version) or 0; |
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254 |
| 148 | 255 if session.version >= 1.0 and not (attr.to and attr.from) then |
| 256 log("warn", (session.to_host or "(unknown)").." failed to specify 'to' or 'from' hostname as per RFC"); | |
| 257 end | |
| 258 | |
| 259 if session.direction == "incoming" then | |
| 260 -- Send a reply stream header | |
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261 session.to_host = attr.to and nameprep(attr.to); |
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262 session.from_host = attr.from and nameprep(attr.from); |
| 148 | 263 |
| 264 session.streamid = uuid_gen(); | |
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265 (session.log or log)("debug", "incoming s2s received <stream:stream>"); |
| 148 | 266 send("<?xml version='1.0'?>"); |
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267 send(stanza("stream:stream", { xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback', |
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268 ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.to_host }):top_tag()); |
| 331 | 269 if session.to_host and not hosts[session.to_host] then |
| 270 -- Attempting to connect to a host we don't serve | |
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271 session:close({ condition = "host-unknown"; text = "This host does not serve "..session.to_host }); |
| 331 | 272 return; |
| 273 end | |
|
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274 if session.version >= 1.0 then |
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275 send(st.stanza("stream:features") |
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276 :tag("dialback", { xmlns='urn:xmpp:features:dialback' }):tag("optional"):up():up()); |
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277 end |
| 148 | 278 elseif session.direction == "outgoing" then |
| 279 -- If we are just using the connection for verifying dialback keys, we won't try and auth it | |
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280 if not attr.id then error("stream response did not give us a streamid!!!"); end |
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281 session.streamid = attr.id; |
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282 |
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283 -- Send unauthed buffer |
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284 -- (stanzas which are fine to send before dialback) |
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285 -- Note that this is *not* the stanza queue (which |
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286 -- we can only send if auth succeeds) :) |
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287 local send_buffer = session.send_buffer; |
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288 if send_buffer and #send_buffer > 0 then |
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289 log("debug", "Sending s2s send_buffer now..."); |
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290 for i, data in ipairs(send_buffer) do |
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291 session.sends2s(tostring(data)); |
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292 send_buffer[i] = nil; |
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293 end |
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294 end |
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295 session.send_buffer = nil; |
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296 |
| 148 | 297 if not session.dialback_verifying then |
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298 initiate_dialback(session); |
| 148 | 299 else |
| 300 mark_connected(session); | |
| 301 end | |
| 302 end | |
| 259 | 303 |
| 148 | 304 session.notopen = nil; |
| 305 end | |
| 306 | |
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307 function streamclosed(session) |
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308 (session.log or log)("debug", "</stream:stream>"); |
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309 if session.sends2s then |
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310 session.sends2s("</stream:stream>"); |
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311 end |
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312 session.notopen = true; |
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313 end |
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314 |
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315 function initiate_dialback(session) |
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316 -- generate dialback key |
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317 session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host); |
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318 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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319 session.log("info", "sent dialback key on outgoing s2s stream"); |
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320 end |
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321 |
| 148 | 322 function generate_dialback(id, to, from) |
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323 return sha256_hash(id..to..from..dialback_secret, true); |
| 148 | 324 end |
| 325 | |
| 326 function verify_dialback(id, to, from, key) | |
| 327 return key == generate_dialback(id, to, from); | |
| 328 end | |
| 329 | |
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330 function make_authenticated(session, host) |
| 148 | 331 if session.type == "s2sout_unauthed" then |
| 332 session.type = "s2sout"; | |
| 333 elseif session.type == "s2sin_unauthed" then | |
| 334 session.type = "s2sin"; | |
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335 if host then |
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336 session.hosts[host].authed = true; |
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337 end |
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338 elseif session.type == "s2sin" and host then |
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339 session.hosts[host].authed = true; |
| 148 | 340 else |
| 341 return false; | |
| 342 end | |
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343 session.log("debug", "connection %s->%s is now authenticated", session.from_host or "(unknown)", session.to_host or "(unknown)"); |
| 148 | 344 |
| 345 mark_connected(session); | |
| 346 | |
| 347 return true; | |
| 348 end | |
| 349 | |
| 350 function mark_connected(session) | |
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351 local sendq, send = session.sendq, session.sends2s; |
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352 |
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353 local from, to = session.from_host, session.to_host; |
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354 |
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355 session.log("info", session.direction.." s2s connection "..from.."->"..to.." complete"); |
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356 |
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357 local send_to_host = send_to_host; |
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358 function session.send(data) send_to_host(to, from, data); end |
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359 |
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360 |
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361 if session.direction == "outgoing" then |
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362 if sendq then |
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363 session.log("debug", "sending "..#sendq.." queued stanzas across new outgoing connection to "..session.to_host); |
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364 for i, data in ipairs(sendq) do |
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365 send(data[1]); |
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366 sendq[i] = nil; |
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367 end |
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368 session.sendq = nil; |
| 148 | 369 end |
| 370 end | |
| 371 end | |
| 372 | |
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373 function destroy_session(session) |
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374 (session.log or log)("info", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host)); |
| 331 | 375 |
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376 if session.direction == "outgoing" then |
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377 hosts[session.from_host].s2sout[session.to_host] = nil; |
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378 bounce_sendq(session); |
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379 elseif session.direction == "incoming" then |
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380 incoming_s2s[session] = nil; |
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381 end |
| 331 | 382 |
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383 for k in pairs(session) do |
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384 if k ~= "trace" then |
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385 session[k] = nil; |
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386 end |
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387 end |
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388 end |
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389 |
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390 return _M; |
